1 /* PowerPC64-specific support for 64-bit ELF.
2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Written by Linus Nordberg, Swox AB <info@swox.com>,
5 based on elf32-ppc.c by Ian Lance Taylor.
6 Largely rewritten by Alan Modra <amodra@bigpond.net.au>
7
8 This file is part of BFD, the Binary File Descriptor library.
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License along
21 with this program; if not, write to the Free Software Foundation, Inc.,
22 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
23
24 /* The 64-bit PowerPC ELF ABI may be found at
25 http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi.txt, and
26 http://www.linuxbase.org/spec/ELF/ppc64/spec/book1.html */
27
28 #include "sysdep.h"
29 #include <stdarg.h>
30 #include "bfd.h"
31 #include "bfdlink.h"
32 #include "libbfd.h"
33 #include "elf-bfd.h"
34 #include "elf/ppc64.h"
35 #include "elf64-ppc.h"
36
37 static bfd_reloc_status_type ppc64_elf_ha_reloc
38 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
39 static bfd_reloc_status_type ppc64_elf_branch_reloc
40 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
41 static bfd_reloc_status_type ppc64_elf_brtaken_reloc
42 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
43 static bfd_reloc_status_type ppc64_elf_sectoff_reloc
44 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
45 static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc
46 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
47 static bfd_reloc_status_type ppc64_elf_toc_reloc
48 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
49 static bfd_reloc_status_type ppc64_elf_toc_ha_reloc
50 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
51 static bfd_reloc_status_type ppc64_elf_toc64_reloc
52 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
53 static bfd_reloc_status_type ppc64_elf_unhandled_reloc
54 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
55 static bfd_vma opd_entry_value
56 (asection *, bfd_vma, asection **, bfd_vma *);
57
58 #define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec
59 #define TARGET_LITTLE_NAME "elf64-powerpcle"
60 #define TARGET_BIG_SYM bfd_elf64_powerpc_vec
61 #define TARGET_BIG_NAME "elf64-powerpc-freebsd"
62 #define ELF_ARCH bfd_arch_powerpc
63 #define ELF_MACHINE_CODE EM_PPC64
64 #define ELF_MAXPAGESIZE 0x10000
65 #define ELF_COMMONPAGESIZE 0x1000
66 #define elf_info_to_howto ppc64_elf_info_to_howto
67
68 #define elf_backend_want_got_sym 0
69 #define elf_backend_want_plt_sym 0
70 #define elf_backend_plt_alignment 3
71 #define elf_backend_plt_not_loaded 1
72 #define elf_backend_got_header_size 8
73 #define elf_backend_can_gc_sections 1
74 #define elf_backend_can_refcount 1
75 #define elf_backend_rela_normal 1
76 #define elf_backend_default_execstack 0
77
78 #define bfd_elf64_mkobject ppc64_elf_mkobject
79 #define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup
80 #define bfd_elf64_bfd_reloc_name_lookup ppc64_elf_reloc_name_lookup
81 #define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data
82 #define bfd_elf64_new_section_hook ppc64_elf_new_section_hook
83 #define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create
84 #define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free
85 #define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab
86
87 #define elf_backend_object_p ppc64_elf_object_p
88 #define elf_backend_grok_prstatus ppc64_elf_grok_prstatus
89 #define elf_backend_grok_psinfo ppc64_elf_grok_psinfo
90 #define elf_backend_write_core_note ppc64_elf_write_core_note
91 #define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections
92 #define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol
93 #define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook
94 #define elf_backend_check_directives ppc64_elf_check_directives
95 #define elf_backend_as_needed_cleanup ppc64_elf_as_needed_cleanup
96 #define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup
97 #define elf_backend_check_relocs ppc64_elf_check_relocs
98 #define elf_backend_gc_mark_dynamic_ref ppc64_elf_gc_mark_dynamic_ref
99 #define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook
100 #define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook
101 #define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol
102 #define elf_backend_hide_symbol ppc64_elf_hide_symbol
103 #define elf_backend_always_size_sections ppc64_elf_func_desc_adjust
104 #define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections
105 #define elf_backend_init_index_section _bfd_elf_init_2_index_sections
106 #define elf_backend_action_discarded ppc64_elf_action_discarded
107 #define elf_backend_relocate_section ppc64_elf_relocate_section
108 #define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol
109 #define elf_backend_reloc_type_class ppc64_elf_reloc_type_class
110 #define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections
111 #define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook
112 #define elf_backend_special_sections ppc64_elf_special_sections
113
114 /* The name of the dynamic interpreter. This is put in the .interp
115 section. */
116 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
117
118 /* The size in bytes of an entry in the procedure linkage table. */
119 #define PLT_ENTRY_SIZE 24
120
121 /* The initial size of the plt reserved for the dynamic linker. */
122 #define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE
123
124 /* TOC base pointers offset from start of TOC. */
125 #define TOC_BASE_OFF 0x8000
126
127 /* Offset of tp and dtp pointers from start of TLS block. */
128 #define TP_OFFSET 0x7000
129 #define DTP_OFFSET 0x8000
130
131 /* .plt call stub instructions. The normal stub is like this, but
132 sometimes the .plt entry crosses a 64k boundary and we need to
133 insert an addi to adjust r12. */
134 #define PLT_CALL_STUB_SIZE (7*4)
135 #define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */
136 #define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */
137 #define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */
138 #define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */
139 #define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */
140 /* ld %r11,xxx+16@l(%r12) */
141 #define BCTR 0x4e800420 /* bctr */
142
143
144 #define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,off@ha */
145 #define ADDI_R12_R12 0x398c0000 /* addi %r12,%r12,off@l */
146 #define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */
147 #define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */
148
149 #define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */
150 #define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */
151
152 #define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */
153
154 /* glink call stub instructions. We enter with the index in R0. */
155 #define GLINK_CALL_STUB_SIZE (16*4)
156 /* 0: */
157 /* .quad plt0-1f */
158 /* __glink: */
159 #define MFLR_R12 0x7d8802a6 /* mflr %12 */
160 #define BCL_20_31 0x429f0005 /* bcl 20,31,1f */
161 /* 1: */
162 #define MFLR_R11 0x7d6802a6 /* mflr %11 */
163 #define LD_R2_M16R11 0xe84bfff0 /* ld %2,(0b-1b)(%11) */
164 #define MTLR_R12 0x7d8803a6 /* mtlr %12 */
165 #define ADD_R12_R2_R11 0x7d825a14 /* add %12,%2,%11 */
166 /* ld %11,0(%12) */
167 /* ld %2,8(%12) */
168 /* mtctr %11 */
169 /* ld %11,16(%12) */
170 /* bctr */
171
172 /* Pad with this. */
173 #define NOP 0x60000000
174
175 /* Some other nops. */
176 #define CROR_151515 0x4def7b82
177 #define CROR_313131 0x4ffffb82
178
179 /* .glink entries for the first 32k functions are two instructions. */
180 #define LI_R0_0 0x38000000 /* li %r0,0 */
181 #define B_DOT 0x48000000 /* b . */
182
183 /* After that, we need two instructions to load the index, followed by
184 a branch. */
185 #define LIS_R0_0 0x3c000000 /* lis %r0,0 */
186 #define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */
187
188 /* Instructions used by the save and restore reg functions. */
189 #define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */
190 #define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */
191 #define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */
192 #define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */
193 #define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */
194 #define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */
195 #define LI_R12_0 0x39800000 /* li %r12,0 */
196 #define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */
197 #define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */
198 #define MTLR_R0 0x7c0803a6 /* mtlr %r0 */
199 #define BLR 0x4e800020 /* blr */
200
201 /* Since .opd is an array of descriptors and each entry will end up
202 with identical R_PPC64_RELATIVE relocs, there is really no need to
203 propagate .opd relocs; The dynamic linker should be taught to
204 relocate .opd without reloc entries. */
205 #ifndef NO_OPD_RELOCS
206 #define NO_OPD_RELOCS 0
207 #endif
208
209 #define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1)
210
211 /* Relocation HOWTO's. */
212 static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max];
213
214 static reloc_howto_type ppc64_elf_howto_raw[] = {
215 /* This reloc does nothing. */
216 HOWTO (R_PPC64_NONE, /* type */
217 0, /* rightshift */
218 2, /* size (0 = byte, 1 = short, 2 = long) */
219 32, /* bitsize */
220 FALSE, /* pc_relative */
221 0, /* bitpos */
222 complain_overflow_dont, /* complain_on_overflow */
223 bfd_elf_generic_reloc, /* special_function */
224 "R_PPC64_NONE", /* name */
225 FALSE, /* partial_inplace */
226 0, /* src_mask */
227 0, /* dst_mask */
228 FALSE), /* pcrel_offset */
229
230 /* A standard 32 bit relocation. */
231 HOWTO (R_PPC64_ADDR32, /* type */
232 0, /* rightshift */
233 2, /* size (0 = byte, 1 = short, 2 = long) */
234 32, /* bitsize */
235 FALSE, /* pc_relative */
236 0, /* bitpos */
237 complain_overflow_bitfield, /* complain_on_overflow */
238 bfd_elf_generic_reloc, /* special_function */
239 "R_PPC64_ADDR32", /* name */
240 FALSE, /* partial_inplace */
241 0, /* src_mask */
242 0xffffffff, /* dst_mask */
243 FALSE), /* pcrel_offset */
244
245 /* An absolute 26 bit branch; the lower two bits must be zero.
246 FIXME: we don't check that, we just clear them. */
247 HOWTO (R_PPC64_ADDR24, /* type */
248 0, /* rightshift */
249 2, /* size (0 = byte, 1 = short, 2 = long) */
250 26, /* bitsize */
251 FALSE, /* pc_relative */
252 0, /* bitpos */
253 complain_overflow_bitfield, /* complain_on_overflow */
254 bfd_elf_generic_reloc, /* special_function */
255 "R_PPC64_ADDR24", /* name */
256 FALSE, /* partial_inplace */
257 0, /* src_mask */
258 0x03fffffc, /* dst_mask */
259 FALSE), /* pcrel_offset */
260
261 /* A standard 16 bit relocation. */
262 HOWTO (R_PPC64_ADDR16, /* type */
263 0, /* rightshift */
264 1, /* size (0 = byte, 1 = short, 2 = long) */
265 16, /* bitsize */
266 FALSE, /* pc_relative */
267 0, /* bitpos */
268 complain_overflow_bitfield, /* complain_on_overflow */
269 bfd_elf_generic_reloc, /* special_function */
270 "R_PPC64_ADDR16", /* name */
271 FALSE, /* partial_inplace */
272 0, /* src_mask */
273 0xffff, /* dst_mask */
274 FALSE), /* pcrel_offset */
275
276 /* A 16 bit relocation without overflow. */
277 HOWTO (R_PPC64_ADDR16_LO, /* type */
278 0, /* rightshift */
279 1, /* size (0 = byte, 1 = short, 2 = long) */
280 16, /* bitsize */
281 FALSE, /* pc_relative */
282 0, /* bitpos */
283 complain_overflow_dont,/* complain_on_overflow */
284 bfd_elf_generic_reloc, /* special_function */
285 "R_PPC64_ADDR16_LO", /* name */
286 FALSE, /* partial_inplace */
287 0, /* src_mask */
288 0xffff, /* dst_mask */
289 FALSE), /* pcrel_offset */
290
291 /* Bits 16-31 of an address. */
292 HOWTO (R_PPC64_ADDR16_HI, /* type */
293 16, /* rightshift */
294 1, /* size (0 = byte, 1 = short, 2 = long) */
295 16, /* bitsize */
296 FALSE, /* pc_relative */
297 0, /* bitpos */
298 complain_overflow_dont, /* complain_on_overflow */
299 bfd_elf_generic_reloc, /* special_function */
300 "R_PPC64_ADDR16_HI", /* name */
301 FALSE, /* partial_inplace */
302 0, /* src_mask */
303 0xffff, /* dst_mask */
304 FALSE), /* pcrel_offset */
305
306 /* Bits 16-31 of an address, plus 1 if the contents of the low 16
307 bits, treated as a signed number, is negative. */
308 HOWTO (R_PPC64_ADDR16_HA, /* type */
309 16, /* rightshift */
310 1, /* size (0 = byte, 1 = short, 2 = long) */
311 16, /* bitsize */
312 FALSE, /* pc_relative */
313 0, /* bitpos */
314 complain_overflow_dont, /* complain_on_overflow */
315 ppc64_elf_ha_reloc, /* special_function */
316 "R_PPC64_ADDR16_HA", /* name */
317 FALSE, /* partial_inplace */
318 0, /* src_mask */
319 0xffff, /* dst_mask */
320 FALSE), /* pcrel_offset */
321
322 /* An absolute 16 bit branch; the lower two bits must be zero.
323 FIXME: we don't check that, we just clear them. */
324 HOWTO (R_PPC64_ADDR14, /* type */
325 0, /* rightshift */
326 2, /* size (0 = byte, 1 = short, 2 = long) */
327 16, /* bitsize */
328 FALSE, /* pc_relative */
329 0, /* bitpos */
330 complain_overflow_bitfield, /* complain_on_overflow */
331 ppc64_elf_branch_reloc, /* special_function */
332 "R_PPC64_ADDR14", /* name */
333 FALSE, /* partial_inplace */
334 0, /* src_mask */
335 0x0000fffc, /* dst_mask */
336 FALSE), /* pcrel_offset */
337
338 /* An absolute 16 bit branch, for which bit 10 should be set to
339 indicate that the branch is expected to be taken. The lower two
340 bits must be zero. */
341 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */
342 0, /* rightshift */
343 2, /* size (0 = byte, 1 = short, 2 = long) */
344 16, /* bitsize */
345 FALSE, /* pc_relative */
346 0, /* bitpos */
347 complain_overflow_bitfield, /* complain_on_overflow */
348 ppc64_elf_brtaken_reloc, /* special_function */
349 "R_PPC64_ADDR14_BRTAKEN",/* name */
350 FALSE, /* partial_inplace */
351 0, /* src_mask */
352 0x0000fffc, /* dst_mask */
353 FALSE), /* pcrel_offset */
354
355 /* An absolute 16 bit branch, for which bit 10 should be set to
356 indicate that the branch is not expected to be taken. The lower
357 two bits must be zero. */
358 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */
359 0, /* rightshift */
360 2, /* size (0 = byte, 1 = short, 2 = long) */
361 16, /* bitsize */
362 FALSE, /* pc_relative */
363 0, /* bitpos */
364 complain_overflow_bitfield, /* complain_on_overflow */
365 ppc64_elf_brtaken_reloc, /* special_function */
366 "R_PPC64_ADDR14_BRNTAKEN",/* name */
367 FALSE, /* partial_inplace */
368 0, /* src_mask */
369 0x0000fffc, /* dst_mask */
370 FALSE), /* pcrel_offset */
371
372 /* A relative 26 bit branch; the lower two bits must be zero. */
373 HOWTO (R_PPC64_REL24, /* type */
374 0, /* rightshift */
375 2, /* size (0 = byte, 1 = short, 2 = long) */
376 26, /* bitsize */
377 TRUE, /* pc_relative */
378 0, /* bitpos */
379 complain_overflow_signed, /* complain_on_overflow */
380 ppc64_elf_branch_reloc, /* special_function */
381 "R_PPC64_REL24", /* name */
382 FALSE, /* partial_inplace */
383 0, /* src_mask */
384 0x03fffffc, /* dst_mask */
385 TRUE), /* pcrel_offset */
386
387 /* A relative 16 bit branch; the lower two bits must be zero. */
388 HOWTO (R_PPC64_REL14, /* type */
389 0, /* rightshift */
390 2, /* size (0 = byte, 1 = short, 2 = long) */
391 16, /* bitsize */
392 TRUE, /* pc_relative */
393 0, /* bitpos */
394 complain_overflow_signed, /* complain_on_overflow */
395 ppc64_elf_branch_reloc, /* special_function */
396 "R_PPC64_REL14", /* name */
397 FALSE, /* partial_inplace */
398 0, /* src_mask */
399 0x0000fffc, /* dst_mask */
400 TRUE), /* pcrel_offset */
401
402 /* A relative 16 bit branch. Bit 10 should be set to indicate that
403 the branch is expected to be taken. The lower two bits must be
404 zero. */
405 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */
406 0, /* rightshift */
407 2, /* size (0 = byte, 1 = short, 2 = long) */
408 16, /* bitsize */
409 TRUE, /* pc_relative */
410 0, /* bitpos */
411 complain_overflow_signed, /* complain_on_overflow */
412 ppc64_elf_brtaken_reloc, /* special_function */
413 "R_PPC64_REL14_BRTAKEN", /* name */
414 FALSE, /* partial_inplace */
415 0, /* src_mask */
416 0x0000fffc, /* dst_mask */
417 TRUE), /* pcrel_offset */
418
419 /* A relative 16 bit branch. Bit 10 should be set to indicate that
420 the branch is not expected to be taken. The lower two bits must
421 be zero. */
422 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */
423 0, /* rightshift */
424 2, /* size (0 = byte, 1 = short, 2 = long) */
425 16, /* bitsize */
426 TRUE, /* pc_relative */
427 0, /* bitpos */
428 complain_overflow_signed, /* complain_on_overflow */
429 ppc64_elf_brtaken_reloc, /* special_function */
430 "R_PPC64_REL14_BRNTAKEN",/* name */
431 FALSE, /* partial_inplace */
432 0, /* src_mask */
433 0x0000fffc, /* dst_mask */
434 TRUE), /* pcrel_offset */
435
436 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the
437 symbol. */
438 HOWTO (R_PPC64_GOT16, /* type */
439 0, /* rightshift */
440 1, /* size (0 = byte, 1 = short, 2 = long) */
441 16, /* bitsize */
442 FALSE, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_signed, /* complain_on_overflow */
445 ppc64_elf_unhandled_reloc, /* special_function */
446 "R_PPC64_GOT16", /* name */
447 FALSE, /* partial_inplace */
448 0, /* src_mask */
449 0xffff, /* dst_mask */
450 FALSE), /* pcrel_offset */
451
452 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for
453 the symbol. */
454 HOWTO (R_PPC64_GOT16_LO, /* type */
455 0, /* rightshift */
456 1, /* size (0 = byte, 1 = short, 2 = long) */
457 16, /* bitsize */
458 FALSE, /* pc_relative */
459 0, /* bitpos */
460 complain_overflow_dont, /* complain_on_overflow */
461 ppc64_elf_unhandled_reloc, /* special_function */
462 "R_PPC64_GOT16_LO", /* name */
463 FALSE, /* partial_inplace */
464 0, /* src_mask */
465 0xffff, /* dst_mask */
466 FALSE), /* pcrel_offset */
467
468 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for
469 the symbol. */
470 HOWTO (R_PPC64_GOT16_HI, /* type */
471 16, /* rightshift */
472 1, /* size (0 = byte, 1 = short, 2 = long) */
473 16, /* bitsize */
474 FALSE, /* pc_relative */
475 0, /* bitpos */
476 complain_overflow_dont,/* complain_on_overflow */
477 ppc64_elf_unhandled_reloc, /* special_function */
478 "R_PPC64_GOT16_HI", /* name */
479 FALSE, /* partial_inplace */
480 0, /* src_mask */
481 0xffff, /* dst_mask */
482 FALSE), /* pcrel_offset */
483
484 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for
485 the symbol. */
486 HOWTO (R_PPC64_GOT16_HA, /* type */
487 16, /* rightshift */
488 1, /* size (0 = byte, 1 = short, 2 = long) */
489 16, /* bitsize */
490 FALSE, /* pc_relative */
491 0, /* bitpos */
492 complain_overflow_dont,/* complain_on_overflow */
493 ppc64_elf_unhandled_reloc, /* special_function */
494 "R_PPC64_GOT16_HA", /* name */
495 FALSE, /* partial_inplace */
496 0, /* src_mask */
497 0xffff, /* dst_mask */
498 FALSE), /* pcrel_offset */
499
500 /* This is used only by the dynamic linker. The symbol should exist
501 both in the object being run and in some shared library. The
502 dynamic linker copies the data addressed by the symbol from the
503 shared library into the object, because the object being
504 run has to have the data at some particular address. */
505 HOWTO (R_PPC64_COPY, /* type */
506 0, /* rightshift */
507 0, /* this one is variable size */
508 0, /* bitsize */
509 FALSE, /* pc_relative */
510 0, /* bitpos */
511 complain_overflow_dont, /* complain_on_overflow */
512 ppc64_elf_unhandled_reloc, /* special_function */
513 "R_PPC64_COPY", /* name */
514 FALSE, /* partial_inplace */
515 0, /* src_mask */
516 0, /* dst_mask */
517 FALSE), /* pcrel_offset */
518
519 /* Like R_PPC64_ADDR64, but used when setting global offset table
520 entries. */
521 HOWTO (R_PPC64_GLOB_DAT, /* type */
522 0, /* rightshift */
523 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
524 64, /* bitsize */
525 FALSE, /* pc_relative */
526 0, /* bitpos */
527 complain_overflow_dont, /* complain_on_overflow */
528 ppc64_elf_unhandled_reloc, /* special_function */
529 "R_PPC64_GLOB_DAT", /* name */
530 FALSE, /* partial_inplace */
531 0, /* src_mask */
532 ONES (64), /* dst_mask */
533 FALSE), /* pcrel_offset */
534
535 /* Created by the link editor. Marks a procedure linkage table
536 entry for a symbol. */
537 HOWTO (R_PPC64_JMP_SLOT, /* type */
538 0, /* rightshift */
539 0, /* size (0 = byte, 1 = short, 2 = long) */
540 0, /* bitsize */
541 FALSE, /* pc_relative */
542 0, /* bitpos */
543 complain_overflow_dont, /* complain_on_overflow */
544 ppc64_elf_unhandled_reloc, /* special_function */
545 "R_PPC64_JMP_SLOT", /* name */
546 FALSE, /* partial_inplace */
547 0, /* src_mask */
548 0, /* dst_mask */
549 FALSE), /* pcrel_offset */
550
551 /* Used only by the dynamic linker. When the object is run, this
552 doubleword64 is set to the load address of the object, plus the
553 addend. */
554 HOWTO (R_PPC64_RELATIVE, /* type */
555 0, /* rightshift */
556 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
557 64, /* bitsize */
558 FALSE, /* pc_relative */
559 0, /* bitpos */
560 complain_overflow_dont, /* complain_on_overflow */
561 bfd_elf_generic_reloc, /* special_function */
562 "R_PPC64_RELATIVE", /* name */
563 FALSE, /* partial_inplace */
564 0, /* src_mask */
565 ONES (64), /* dst_mask */
566 FALSE), /* pcrel_offset */
567
568 /* Like R_PPC64_ADDR32, but may be unaligned. */
569 HOWTO (R_PPC64_UADDR32, /* type */
570 0, /* rightshift */
571 2, /* size (0 = byte, 1 = short, 2 = long) */
572 32, /* bitsize */
573 FALSE, /* pc_relative */
574 0, /* bitpos */
575 complain_overflow_bitfield, /* complain_on_overflow */
576 bfd_elf_generic_reloc, /* special_function */
577 "R_PPC64_UADDR32", /* name */
578 FALSE, /* partial_inplace */
579 0, /* src_mask */
580 0xffffffff, /* dst_mask */
581 FALSE), /* pcrel_offset */
582
583 /* Like R_PPC64_ADDR16, but may be unaligned. */
584 HOWTO (R_PPC64_UADDR16, /* type */
585 0, /* rightshift */
586 1, /* size (0 = byte, 1 = short, 2 = long) */
587 16, /* bitsize */
588 FALSE, /* pc_relative */
589 0, /* bitpos */
590 complain_overflow_bitfield, /* complain_on_overflow */
591 bfd_elf_generic_reloc, /* special_function */
592 "R_PPC64_UADDR16", /* name */
593 FALSE, /* partial_inplace */
594 0, /* src_mask */
595 0xffff, /* dst_mask */
596 FALSE), /* pcrel_offset */
597
598 /* 32-bit PC relative. */
599 HOWTO (R_PPC64_REL32, /* type */
600 0, /* rightshift */
601 2, /* size (0 = byte, 1 = short, 2 = long) */
602 32, /* bitsize */
603 TRUE, /* pc_relative */
604 0, /* bitpos */
605 /* FIXME: Verify. Was complain_overflow_bitfield. */
606 complain_overflow_signed, /* complain_on_overflow */
607 bfd_elf_generic_reloc, /* special_function */
608 "R_PPC64_REL32", /* name */
609 FALSE, /* partial_inplace */
610 0, /* src_mask */
611 0xffffffff, /* dst_mask */
612 TRUE), /* pcrel_offset */
613
614 /* 32-bit relocation to the symbol's procedure linkage table. */
615 HOWTO (R_PPC64_PLT32, /* type */
616 0, /* rightshift */
617 2, /* size (0 = byte, 1 = short, 2 = long) */
618 32, /* bitsize */
619 FALSE, /* pc_relative */
620 0, /* bitpos */
621 complain_overflow_bitfield, /* complain_on_overflow */
622 ppc64_elf_unhandled_reloc, /* special_function */
623 "R_PPC64_PLT32", /* name */
624 FALSE, /* partial_inplace */
625 0, /* src_mask */
626 0xffffffff, /* dst_mask */
627 FALSE), /* pcrel_offset */
628
629 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
630 FIXME: R_PPC64_PLTREL32 not supported. */
631 HOWTO (R_PPC64_PLTREL32, /* type */
632 0, /* rightshift */
633 2, /* size (0 = byte, 1 = short, 2 = long) */
634 32, /* bitsize */
635 TRUE, /* pc_relative */
636 0, /* bitpos */
637 complain_overflow_signed, /* complain_on_overflow */
638 bfd_elf_generic_reloc, /* special_function */
639 "R_PPC64_PLTREL32", /* name */
640 FALSE, /* partial_inplace */
641 0, /* src_mask */
642 0xffffffff, /* dst_mask */
643 TRUE), /* pcrel_offset */
644
645 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for
646 the symbol. */
647 HOWTO (R_PPC64_PLT16_LO, /* type */
648 0, /* rightshift */
649 1, /* size (0 = byte, 1 = short, 2 = long) */
650 16, /* bitsize */
651 FALSE, /* pc_relative */
652 0, /* bitpos */
653 complain_overflow_dont, /* complain_on_overflow */
654 ppc64_elf_unhandled_reloc, /* special_function */
655 "R_PPC64_PLT16_LO", /* name */
656 FALSE, /* partial_inplace */
657 0, /* src_mask */
658 0xffff, /* dst_mask */
659 FALSE), /* pcrel_offset */
660
661 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for
662 the symbol. */
663 HOWTO (R_PPC64_PLT16_HI, /* type */
664 16, /* rightshift */
665 1, /* size (0 = byte, 1 = short, 2 = long) */
666 16, /* bitsize */
667 FALSE, /* pc_relative */
668 0, /* bitpos */
669 complain_overflow_dont, /* complain_on_overflow */
670 ppc64_elf_unhandled_reloc, /* special_function */
671 "R_PPC64_PLT16_HI", /* name */
672 FALSE, /* partial_inplace */
673 0, /* src_mask */
674 0xffff, /* dst_mask */
675 FALSE), /* pcrel_offset */
676
677 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for
678 the symbol. */
679 HOWTO (R_PPC64_PLT16_HA, /* type */
680 16, /* rightshift */
681 1, /* size (0 = byte, 1 = short, 2 = long) */
682 16, /* bitsize */
683 FALSE, /* pc_relative */
684 0, /* bitpos */
685 complain_overflow_dont, /* complain_on_overflow */
686 ppc64_elf_unhandled_reloc, /* special_function */
687 "R_PPC64_PLT16_HA", /* name */
688 FALSE, /* partial_inplace */
689 0, /* src_mask */
690 0xffff, /* dst_mask */
691 FALSE), /* pcrel_offset */
692
693 /* 16-bit section relative relocation. */
694 HOWTO (R_PPC64_SECTOFF, /* type */
695 0, /* rightshift */
696 1, /* size (0 = byte, 1 = short, 2 = long) */
697 16, /* bitsize */
698 FALSE, /* pc_relative */
699 0, /* bitpos */
700 complain_overflow_bitfield, /* complain_on_overflow */
701 ppc64_elf_sectoff_reloc, /* special_function */
702 "R_PPC64_SECTOFF", /* name */
703 FALSE, /* partial_inplace */
704 0, /* src_mask */
705 0xffff, /* dst_mask */
706 FALSE), /* pcrel_offset */
707
708 /* Like R_PPC64_SECTOFF, but no overflow warning. */
709 HOWTO (R_PPC64_SECTOFF_LO, /* type */
710 0, /* rightshift */
711 1, /* size (0 = byte, 1 = short, 2 = long) */
712 16, /* bitsize */
713 FALSE, /* pc_relative */
714 0, /* bitpos */
715 complain_overflow_dont, /* complain_on_overflow */
716 ppc64_elf_sectoff_reloc, /* special_function */
717 "R_PPC64_SECTOFF_LO", /* name */
718 FALSE, /* partial_inplace */
719 0, /* src_mask */
720 0xffff, /* dst_mask */
721 FALSE), /* pcrel_offset */
722
723 /* 16-bit upper half section relative relocation. */
724 HOWTO (R_PPC64_SECTOFF_HI, /* type */
725 16, /* rightshift */
726 1, /* size (0 = byte, 1 = short, 2 = long) */
727 16, /* bitsize */
728 FALSE, /* pc_relative */
729 0, /* bitpos */
730 complain_overflow_dont, /* complain_on_overflow */
731 ppc64_elf_sectoff_reloc, /* special_function */
732 "R_PPC64_SECTOFF_HI", /* name */
733 FALSE, /* partial_inplace */
734 0, /* src_mask */
735 0xffff, /* dst_mask */
736 FALSE), /* pcrel_offset */
737
738 /* 16-bit upper half adjusted section relative relocation. */
739 HOWTO (R_PPC64_SECTOFF_HA, /* type */
740 16, /* rightshift */
741 1, /* size (0 = byte, 1 = short, 2 = long) */
742 16, /* bitsize */
743 FALSE, /* pc_relative */
744 0, /* bitpos */
745 complain_overflow_dont, /* complain_on_overflow */
746 ppc64_elf_sectoff_ha_reloc, /* special_function */
747 "R_PPC64_SECTOFF_HA", /* name */
748 FALSE, /* partial_inplace */
749 0, /* src_mask */
750 0xffff, /* dst_mask */
751 FALSE), /* pcrel_offset */
752
753 /* Like R_PPC64_REL24 without touching the two least significant bits. */
754 HOWTO (R_PPC64_REL30, /* type */
755 2, /* rightshift */
756 2, /* size (0 = byte, 1 = short, 2 = long) */
757 30, /* bitsize */
758 TRUE, /* pc_relative */
759 0, /* bitpos */
760 complain_overflow_dont, /* complain_on_overflow */
761 bfd_elf_generic_reloc, /* special_function */
762 "R_PPC64_REL30", /* name */
763 FALSE, /* partial_inplace */
764 0, /* src_mask */
765 0xfffffffc, /* dst_mask */
766 TRUE), /* pcrel_offset */
767
768 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */
769
770 /* A standard 64-bit relocation. */
771 HOWTO (R_PPC64_ADDR64, /* type */
772 0, /* rightshift */
773 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
774 64, /* bitsize */
775 FALSE, /* pc_relative */
776 0, /* bitpos */
777 complain_overflow_dont, /* complain_on_overflow */
778 bfd_elf_generic_reloc, /* special_function */
779 "R_PPC64_ADDR64", /* name */
780 FALSE, /* partial_inplace */
781 0, /* src_mask */
782 ONES (64), /* dst_mask */
783 FALSE), /* pcrel_offset */
784
785 /* The bits 32-47 of an address. */
786 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */
787 32, /* rightshift */
788 1, /* size (0 = byte, 1 = short, 2 = long) */
789 16, /* bitsize */
790 FALSE, /* pc_relative */
791 0, /* bitpos */
792 complain_overflow_dont, /* complain_on_overflow */
793 bfd_elf_generic_reloc, /* special_function */
794 "R_PPC64_ADDR16_HIGHER", /* name */
795 FALSE, /* partial_inplace */
796 0, /* src_mask */
797 0xffff, /* dst_mask */
798 FALSE), /* pcrel_offset */
799
800 /* The bits 32-47 of an address, plus 1 if the contents of the low
801 16 bits, treated as a signed number, is negative. */
802 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */
803 32, /* rightshift */
804 1, /* size (0 = byte, 1 = short, 2 = long) */
805 16, /* bitsize */
806 FALSE, /* pc_relative */
807 0, /* bitpos */
808 complain_overflow_dont, /* complain_on_overflow */
809 ppc64_elf_ha_reloc, /* special_function */
810 "R_PPC64_ADDR16_HIGHERA", /* name */
811 FALSE, /* partial_inplace */
812 0, /* src_mask */
813 0xffff, /* dst_mask */
814 FALSE), /* pcrel_offset */
815
816 /* The bits 48-63 of an address. */
817 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */
818 48, /* rightshift */
819 1, /* size (0 = byte, 1 = short, 2 = long) */
820 16, /* bitsize */
821 FALSE, /* pc_relative */
822 0, /* bitpos */
823 complain_overflow_dont, /* complain_on_overflow */
824 bfd_elf_generic_reloc, /* special_function */
825 "R_PPC64_ADDR16_HIGHEST", /* name */
826 FALSE, /* partial_inplace */
827 0, /* src_mask */
828 0xffff, /* dst_mask */
829 FALSE), /* pcrel_offset */
830
831 /* The bits 48-63 of an address, plus 1 if the contents of the low
832 16 bits, treated as a signed number, is negative. */
833 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */
834 48, /* rightshift */
835 1, /* size (0 = byte, 1 = short, 2 = long) */
836 16, /* bitsize */
837 FALSE, /* pc_relative */
838 0, /* bitpos */
839 complain_overflow_dont, /* complain_on_overflow */
840 ppc64_elf_ha_reloc, /* special_function */
841 "R_PPC64_ADDR16_HIGHESTA", /* name */
842 FALSE, /* partial_inplace */
843 0, /* src_mask */
844 0xffff, /* dst_mask */
845 FALSE), /* pcrel_offset */
846
847 /* Like ADDR64, but may be unaligned. */
848 HOWTO (R_PPC64_UADDR64, /* type */
849 0, /* rightshift */
850 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
851 64, /* bitsize */
852 FALSE, /* pc_relative */
853 0, /* bitpos */
854 complain_overflow_dont, /* complain_on_overflow */
855 bfd_elf_generic_reloc, /* special_function */
856 "R_PPC64_UADDR64", /* name */
857 FALSE, /* partial_inplace */
858 0, /* src_mask */
859 ONES (64), /* dst_mask */
860 FALSE), /* pcrel_offset */
861
862 /* 64-bit relative relocation. */
863 HOWTO (R_PPC64_REL64, /* type */
864 0, /* rightshift */
865 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
866 64, /* bitsize */
867 TRUE, /* pc_relative */
868 0, /* bitpos */
869 complain_overflow_dont, /* complain_on_overflow */
870 bfd_elf_generic_reloc, /* special_function */
871 "R_PPC64_REL64", /* name */
872 FALSE, /* partial_inplace */
873 0, /* src_mask */
874 ONES (64), /* dst_mask */
875 TRUE), /* pcrel_offset */
876
877 /* 64-bit relocation to the symbol's procedure linkage table. */
878 HOWTO (R_PPC64_PLT64, /* type */
879 0, /* rightshift */
880 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
881 64, /* bitsize */
882 FALSE, /* pc_relative */
883 0, /* bitpos */
884 complain_overflow_dont, /* complain_on_overflow */
885 ppc64_elf_unhandled_reloc, /* special_function */
886 "R_PPC64_PLT64", /* name */
887 FALSE, /* partial_inplace */
888 0, /* src_mask */
889 ONES (64), /* dst_mask */
890 FALSE), /* pcrel_offset */
891
892 /* 64-bit PC relative relocation to the symbol's procedure linkage
893 table. */
894 /* FIXME: R_PPC64_PLTREL64 not supported. */
895 HOWTO (R_PPC64_PLTREL64, /* type */
896 0, /* rightshift */
897 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
898 64, /* bitsize */
899 TRUE, /* pc_relative */
900 0, /* bitpos */
901 complain_overflow_dont, /* complain_on_overflow */
902 ppc64_elf_unhandled_reloc, /* special_function */
903 "R_PPC64_PLTREL64", /* name */
904 FALSE, /* partial_inplace */
905 0, /* src_mask */
906 ONES (64), /* dst_mask */
907 TRUE), /* pcrel_offset */
908
909 /* 16 bit TOC-relative relocation. */
910
911 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */
912 HOWTO (R_PPC64_TOC16, /* type */
913 0, /* rightshift */
914 1, /* size (0 = byte, 1 = short, 2 = long) */
915 16, /* bitsize */
916 FALSE, /* pc_relative */
917 0, /* bitpos */
918 complain_overflow_signed, /* complain_on_overflow */
919 ppc64_elf_toc_reloc, /* special_function */
920 "R_PPC64_TOC16", /* name */
921 FALSE, /* partial_inplace */
922 0, /* src_mask */
923 0xffff, /* dst_mask */
924 FALSE), /* pcrel_offset */
925
926 /* 16 bit TOC-relative relocation without overflow. */
927
928 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */
929 HOWTO (R_PPC64_TOC16_LO, /* type */
930 0, /* rightshift */
931 1, /* size (0 = byte, 1 = short, 2 = long) */
932 16, /* bitsize */
933 FALSE, /* pc_relative */
934 0, /* bitpos */
935 complain_overflow_dont, /* complain_on_overflow */
936 ppc64_elf_toc_reloc, /* special_function */
937 "R_PPC64_TOC16_LO", /* name */
938 FALSE, /* partial_inplace */
939 0, /* src_mask */
940 0xffff, /* dst_mask */
941 FALSE), /* pcrel_offset */
942
943 /* 16 bit TOC-relative relocation, high 16 bits. */
944
945 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */
946 HOWTO (R_PPC64_TOC16_HI, /* type */
947 16, /* rightshift */
948 1, /* size (0 = byte, 1 = short, 2 = long) */
949 16, /* bitsize */
950 FALSE, /* pc_relative */
951 0, /* bitpos */
952 complain_overflow_dont, /* complain_on_overflow */
953 ppc64_elf_toc_reloc, /* special_function */
954 "R_PPC64_TOC16_HI", /* name */
955 FALSE, /* partial_inplace */
956 0, /* src_mask */
957 0xffff, /* dst_mask */
958 FALSE), /* pcrel_offset */
959
960 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the
961 contents of the low 16 bits, treated as a signed number, is
962 negative. */
963
964 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */
965 HOWTO (R_PPC64_TOC16_HA, /* type */
966 16, /* rightshift */
967 1, /* size (0 = byte, 1 = short, 2 = long) */
968 16, /* bitsize */
969 FALSE, /* pc_relative */
970 0, /* bitpos */
971 complain_overflow_dont, /* complain_on_overflow */
972 ppc64_elf_toc_ha_reloc, /* special_function */
973 "R_PPC64_TOC16_HA", /* name */
974 FALSE, /* partial_inplace */
975 0, /* src_mask */
976 0xffff, /* dst_mask */
977 FALSE), /* pcrel_offset */
978
979 /* 64-bit relocation; insert value of TOC base (.TOC.). */
980
981 /* R_PPC64_TOC 51 doubleword64 .TOC. */
982 HOWTO (R_PPC64_TOC, /* type */
983 0, /* rightshift */
984 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
985 64, /* bitsize */
986 FALSE, /* pc_relative */
987 0, /* bitpos */
988 complain_overflow_bitfield, /* complain_on_overflow */
989 ppc64_elf_toc64_reloc, /* special_function */
990 "R_PPC64_TOC", /* name */
991 FALSE, /* partial_inplace */
992 0, /* src_mask */
993 ONES (64), /* dst_mask */
994 FALSE), /* pcrel_offset */
995
996 /* Like R_PPC64_GOT16, but also informs the link editor that the
997 value to relocate may (!) refer to a PLT entry which the link
998 editor (a) may replace with the symbol value. If the link editor
999 is unable to fully resolve the symbol, it may (b) create a PLT
1000 entry and store the address to the new PLT entry in the GOT.
1001 This permits lazy resolution of function symbols at run time.
1002 The link editor may also skip all of this and just (c) emit a
1003 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */
1004 /* FIXME: R_PPC64_PLTGOT16 not implemented. */
1005 HOWTO (R_PPC64_PLTGOT16, /* type */
1006 0, /* rightshift */
1007 1, /* size (0 = byte, 1 = short, 2 = long) */
1008 16, /* bitsize */
1009 FALSE, /* pc_relative */
1010 0, /* bitpos */
1011 complain_overflow_signed, /* complain_on_overflow */
1012 ppc64_elf_unhandled_reloc, /* special_function */
1013 "R_PPC64_PLTGOT16", /* name */
1014 FALSE, /* partial_inplace */
1015 0, /* src_mask */
1016 0xffff, /* dst_mask */
1017 FALSE), /* pcrel_offset */
1018
1019 /* Like R_PPC64_PLTGOT16, but without overflow. */
1020 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
1021 HOWTO (R_PPC64_PLTGOT16_LO, /* type */
1022 0, /* rightshift */
1023 1, /* size (0 = byte, 1 = short, 2 = long) */
1024 16, /* bitsize */
1025 FALSE, /* pc_relative */
1026 0, /* bitpos */
1027 complain_overflow_dont, /* complain_on_overflow */
1028 ppc64_elf_unhandled_reloc, /* special_function */
1029 "R_PPC64_PLTGOT16_LO", /* name */
1030 FALSE, /* partial_inplace */
1031 0, /* src_mask */
1032 0xffff, /* dst_mask */
1033 FALSE), /* pcrel_offset */
1034
1035 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */
1036 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */
1037 HOWTO (R_PPC64_PLTGOT16_HI, /* type */
1038 16, /* rightshift */
1039 1, /* size (0 = byte, 1 = short, 2 = long) */
1040 16, /* bitsize */
1041 FALSE, /* pc_relative */
1042 0, /* bitpos */
1043 complain_overflow_dont, /* complain_on_overflow */
1044 ppc64_elf_unhandled_reloc, /* special_function */
1045 "R_PPC64_PLTGOT16_HI", /* name */
1046 FALSE, /* partial_inplace */
1047 0, /* src_mask */
1048 0xffff, /* dst_mask */
1049 FALSE), /* pcrel_offset */
1050
1051 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus
1052 1 if the contents of the low 16 bits, treated as a signed number,
1053 is negative. */
1054 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */
1055 HOWTO (R_PPC64_PLTGOT16_HA, /* type */
1056 16, /* rightshift */
1057 1, /* size (0 = byte, 1 = short, 2 = long) */
1058 16, /* bitsize */
1059 FALSE, /* pc_relative */
1060 0, /* bitpos */
1061 complain_overflow_dont,/* complain_on_overflow */
1062 ppc64_elf_unhandled_reloc, /* special_function */
1063 "R_PPC64_PLTGOT16_HA", /* name */
1064 FALSE, /* partial_inplace */
1065 0, /* src_mask */
1066 0xffff, /* dst_mask */
1067 FALSE), /* pcrel_offset */
1068
1069 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */
1070 HOWTO (R_PPC64_ADDR16_DS, /* type */
1071 0, /* rightshift */
1072 1, /* size (0 = byte, 1 = short, 2 = long) */
1073 16, /* bitsize */
1074 FALSE, /* pc_relative */
1075 0, /* bitpos */
1076 complain_overflow_bitfield, /* complain_on_overflow */
1077 bfd_elf_generic_reloc, /* special_function */
1078 "R_PPC64_ADDR16_DS", /* name */
1079 FALSE, /* partial_inplace */
1080 0, /* src_mask */
1081 0xfffc, /* dst_mask */
1082 FALSE), /* pcrel_offset */
1083
1084 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */
1085 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */
1086 0, /* rightshift */
1087 1, /* size (0 = byte, 1 = short, 2 = long) */
1088 16, /* bitsize */
1089 FALSE, /* pc_relative */
1090 0, /* bitpos */
1091 complain_overflow_dont,/* complain_on_overflow */
1092 bfd_elf_generic_reloc, /* special_function */
1093 "R_PPC64_ADDR16_LO_DS",/* name */
1094 FALSE, /* partial_inplace */
1095 0, /* src_mask */
1096 0xfffc, /* dst_mask */
1097 FALSE), /* pcrel_offset */
1098
1099 /* Like R_PPC64_GOT16, but for instructions with a DS field. */
1100 HOWTO (R_PPC64_GOT16_DS, /* type */
1101 0, /* rightshift */
1102 1, /* size (0 = byte, 1 = short, 2 = long) */
1103 16, /* bitsize */
1104 FALSE, /* pc_relative */
1105 0, /* bitpos */
1106 complain_overflow_signed, /* complain_on_overflow */
1107 ppc64_elf_unhandled_reloc, /* special_function */
1108 "R_PPC64_GOT16_DS", /* name */
1109 FALSE, /* partial_inplace */
1110 0, /* src_mask */
1111 0xfffc, /* dst_mask */
1112 FALSE), /* pcrel_offset */
1113
1114 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */
1115 HOWTO (R_PPC64_GOT16_LO_DS, /* type */
1116 0, /* rightshift */
1117 1, /* size (0 = byte, 1 = short, 2 = long) */
1118 16, /* bitsize */
1119 FALSE, /* pc_relative */
1120 0, /* bitpos */
1121 complain_overflow_dont, /* complain_on_overflow */
1122 ppc64_elf_unhandled_reloc, /* special_function */
1123 "R_PPC64_GOT16_LO_DS", /* name */
1124 FALSE, /* partial_inplace */
1125 0, /* src_mask */
1126 0xfffc, /* dst_mask */
1127 FALSE), /* pcrel_offset */
1128
1129 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */
1130 HOWTO (R_PPC64_PLT16_LO_DS, /* type */
1131 0, /* rightshift */
1132 1, /* size (0 = byte, 1 = short, 2 = long) */
1133 16, /* bitsize */
1134 FALSE, /* pc_relative */
1135 0, /* bitpos */
1136 complain_overflow_dont, /* complain_on_overflow */
1137 ppc64_elf_unhandled_reloc, /* special_function */
1138 "R_PPC64_PLT16_LO_DS", /* name */
1139 FALSE, /* partial_inplace */
1140 0, /* src_mask */
1141 0xfffc, /* dst_mask */
1142 FALSE), /* pcrel_offset */
1143
1144 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */
1145 HOWTO (R_PPC64_SECTOFF_DS, /* type */
1146 0, /* rightshift */
1147 1, /* size (0 = byte, 1 = short, 2 = long) */
1148 16, /* bitsize */
1149 FALSE, /* pc_relative */
1150 0, /* bitpos */
1151 complain_overflow_bitfield, /* complain_on_overflow */
1152 ppc64_elf_sectoff_reloc, /* special_function */
1153 "R_PPC64_SECTOFF_DS", /* name */
1154 FALSE, /* partial_inplace */
1155 0, /* src_mask */
1156 0xfffc, /* dst_mask */
1157 FALSE), /* pcrel_offset */
1158
1159 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */
1160 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */
1161 0, /* rightshift */
1162 1, /* size (0 = byte, 1 = short, 2 = long) */
1163 16, /* bitsize */
1164 FALSE, /* pc_relative */
1165 0, /* bitpos */
1166 complain_overflow_dont, /* complain_on_overflow */
1167 ppc64_elf_sectoff_reloc, /* special_function */
1168 "R_PPC64_SECTOFF_LO_DS",/* name */
1169 FALSE, /* partial_inplace */
1170 0, /* src_mask */
1171 0xfffc, /* dst_mask */
1172 FALSE), /* pcrel_offset */
1173
1174 /* Like R_PPC64_TOC16, but for instructions with a DS field. */
1175 HOWTO (R_PPC64_TOC16_DS, /* type */
1176 0, /* rightshift */
1177 1, /* size (0 = byte, 1 = short, 2 = long) */
1178 16, /* bitsize */
1179 FALSE, /* pc_relative */
1180 0, /* bitpos */
1181 complain_overflow_signed, /* complain_on_overflow */
1182 ppc64_elf_toc_reloc, /* special_function */
1183 "R_PPC64_TOC16_DS", /* name */
1184 FALSE, /* partial_inplace */
1185 0, /* src_mask */
1186 0xfffc, /* dst_mask */
1187 FALSE), /* pcrel_offset */
1188
1189 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */
1190 HOWTO (R_PPC64_TOC16_LO_DS, /* type */
1191 0, /* rightshift */
1192 1, /* size (0 = byte, 1 = short, 2 = long) */
1193 16, /* bitsize */
1194 FALSE, /* pc_relative */
1195 0, /* bitpos */
1196 complain_overflow_dont, /* complain_on_overflow */
1197 ppc64_elf_toc_reloc, /* special_function */
1198 "R_PPC64_TOC16_LO_DS", /* name */
1199 FALSE, /* partial_inplace */
1200 0, /* src_mask */
1201 0xfffc, /* dst_mask */
1202 FALSE), /* pcrel_offset */
1203
1204 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */
1205 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */
1206 HOWTO (R_PPC64_PLTGOT16_DS, /* type */
1207 0, /* rightshift */
1208 1, /* size (0 = byte, 1 = short, 2 = long) */
1209 16, /* bitsize */
1210 FALSE, /* pc_relative */
1211 0, /* bitpos */
1212 complain_overflow_signed, /* complain_on_overflow */
1213 ppc64_elf_unhandled_reloc, /* special_function */
1214 "R_PPC64_PLTGOT16_DS", /* name */
1215 FALSE, /* partial_inplace */
1216 0, /* src_mask */
1217 0xfffc, /* dst_mask */
1218 FALSE), /* pcrel_offset */
1219
1220 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */
1221 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
1222 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */
1223 0, /* rightshift */
1224 1, /* size (0 = byte, 1 = short, 2 = long) */
1225 16, /* bitsize */
1226 FALSE, /* pc_relative */
1227 0, /* bitpos */
1228 complain_overflow_dont, /* complain_on_overflow */
1229 ppc64_elf_unhandled_reloc, /* special_function */
1230 "R_PPC64_PLTGOT16_LO_DS",/* name */
1231 FALSE, /* partial_inplace */
1232 0, /* src_mask */
1233 0xfffc, /* dst_mask */
1234 FALSE), /* pcrel_offset */
1235
1236 /* Marker relocs for TLS. */
1237 HOWTO (R_PPC64_TLS,
1238 0, /* rightshift */
1239 2, /* size (0 = byte, 1 = short, 2 = long) */
1240 32, /* bitsize */
1241 FALSE, /* pc_relative */
1242 0, /* bitpos */
1243 complain_overflow_dont, /* complain_on_overflow */
1244 bfd_elf_generic_reloc, /* special_function */
1245 "R_PPC64_TLS", /* name */
1246 FALSE, /* partial_inplace */
1247 0, /* src_mask */
1248 0, /* dst_mask */
1249 FALSE), /* pcrel_offset */
1250
1251 HOWTO (R_PPC64_TLSGD,
1252 0, /* rightshift */
1253 2, /* size (0 = byte, 1 = short, 2 = long) */
1254 32, /* bitsize */
1255 FALSE, /* pc_relative */
1256 0, /* bitpos */
1257 complain_overflow_dont, /* complain_on_overflow */
1258 bfd_elf_generic_reloc, /* special_function */
1259 "R_PPC64_TLSGD", /* name */
1260 FALSE, /* partial_inplace */
1261 0, /* src_mask */
1262 0, /* dst_mask */
1263 FALSE), /* pcrel_offset */
1264
1265 HOWTO (R_PPC64_TLSLD,
1266 0, /* rightshift */
1267 2, /* size (0 = byte, 1 = short, 2 = long) */
1268 32, /* bitsize */
1269 FALSE, /* pc_relative */
1270 0, /* bitpos */
1271 complain_overflow_dont, /* complain_on_overflow */
1272 bfd_elf_generic_reloc, /* special_function */
1273 "R_PPC64_TLSLD", /* name */
1274 FALSE, /* partial_inplace */
1275 0, /* src_mask */
1276 0, /* dst_mask */
1277 FALSE), /* pcrel_offset */
1278
1279 /* Computes the load module index of the load module that contains the
1280 definition of its TLS sym. */
1281 HOWTO (R_PPC64_DTPMOD64,
1282 0, /* rightshift */
1283 4, /* size (0 = byte, 1 = short, 2 = long) */
1284 64, /* bitsize */
1285 FALSE, /* pc_relative */
1286 0, /* bitpos */
1287 complain_overflow_dont, /* complain_on_overflow */
1288 ppc64_elf_unhandled_reloc, /* special_function */
1289 "R_PPC64_DTPMOD64", /* name */
1290 FALSE, /* partial_inplace */
1291 0, /* src_mask */
1292 ONES (64), /* dst_mask */
1293 FALSE), /* pcrel_offset */
1294
1295 /* Computes a dtv-relative displacement, the difference between the value
1296 of sym+add and the base address of the thread-local storage block that
1297 contains the definition of sym, minus 0x8000. */
1298 HOWTO (R_PPC64_DTPREL64,
1299 0, /* rightshift */
1300 4, /* size (0 = byte, 1 = short, 2 = long) */
1301 64, /* bitsize */
1302 FALSE, /* pc_relative */
1303 0, /* bitpos */
1304 complain_overflow_dont, /* complain_on_overflow */
1305 ppc64_elf_unhandled_reloc, /* special_function */
1306 "R_PPC64_DTPREL64", /* name */
1307 FALSE, /* partial_inplace */
1308 0, /* src_mask */
1309 ONES (64), /* dst_mask */
1310 FALSE), /* pcrel_offset */
1311
1312 /* A 16 bit dtprel reloc. */
1313 HOWTO (R_PPC64_DTPREL16,
1314 0, /* rightshift */
1315 1, /* size (0 = byte, 1 = short, 2 = long) */
1316 16, /* bitsize */
1317 FALSE, /* pc_relative */
1318 0, /* bitpos */
1319 complain_overflow_signed, /* complain_on_overflow */
1320 ppc64_elf_unhandled_reloc, /* special_function */
1321 "R_PPC64_DTPREL16", /* name */
1322 FALSE, /* partial_inplace */
1323 0, /* src_mask */
1324 0xffff, /* dst_mask */
1325 FALSE), /* pcrel_offset */
1326
1327 /* Like DTPREL16, but no overflow. */
1328 HOWTO (R_PPC64_DTPREL16_LO,
1329 0, /* rightshift */
1330 1, /* size (0 = byte, 1 = short, 2 = long) */
1331 16, /* bitsize */
1332 FALSE, /* pc_relative */
1333 0, /* bitpos */
1334 complain_overflow_dont, /* complain_on_overflow */
1335 ppc64_elf_unhandled_reloc, /* special_function */
1336 "R_PPC64_DTPREL16_LO", /* name */
1337 FALSE, /* partial_inplace */
1338 0, /* src_mask */
1339 0xffff, /* dst_mask */
1340 FALSE), /* pcrel_offset */
1341
1342 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1343 HOWTO (R_PPC64_DTPREL16_HI,
1344 16, /* rightshift */
1345 1, /* size (0 = byte, 1 = short, 2 = long) */
1346 16, /* bitsize */
1347 FALSE, /* pc_relative */
1348 0, /* bitpos */
1349 complain_overflow_dont, /* complain_on_overflow */
1350 ppc64_elf_unhandled_reloc, /* special_function */
1351 "R_PPC64_DTPREL16_HI", /* name */
1352 FALSE, /* partial_inplace */
1353 0, /* src_mask */
1354 0xffff, /* dst_mask */
1355 FALSE), /* pcrel_offset */
1356
1357 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1358 HOWTO (R_PPC64_DTPREL16_HA,
1359 16, /* rightshift */
1360 1, /* size (0 = byte, 1 = short, 2 = long) */
1361 16, /* bitsize */
1362 FALSE, /* pc_relative */
1363 0, /* bitpos */
1364 complain_overflow_dont, /* complain_on_overflow */
1365 ppc64_elf_unhandled_reloc, /* special_function */
1366 "R_PPC64_DTPREL16_HA", /* name */
1367 FALSE, /* partial_inplace */
1368 0, /* src_mask */
1369 0xffff, /* dst_mask */
1370 FALSE), /* pcrel_offset */
1371
1372 /* Like DTPREL16_HI, but next higher group of 16 bits. */
1373 HOWTO (R_PPC64_DTPREL16_HIGHER,
1374 32, /* rightshift */
1375 1, /* size (0 = byte, 1 = short, 2 = long) */
1376 16, /* bitsize */
1377 FALSE, /* pc_relative */
1378 0, /* bitpos */
1379 complain_overflow_dont, /* complain_on_overflow */
1380 ppc64_elf_unhandled_reloc, /* special_function */
1381 "R_PPC64_DTPREL16_HIGHER", /* name */
1382 FALSE, /* partial_inplace */
1383 0, /* src_mask */
1384 0xffff, /* dst_mask */
1385 FALSE), /* pcrel_offset */
1386
1387 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */
1388 HOWTO (R_PPC64_DTPREL16_HIGHERA,
1389 32, /* rightshift */
1390 1, /* size (0 = byte, 1 = short, 2 = long) */
1391 16, /* bitsize */
1392 FALSE, /* pc_relative */
1393 0, /* bitpos */
1394 complain_overflow_dont, /* complain_on_overflow */
1395 ppc64_elf_unhandled_reloc, /* special_function */
1396 "R_PPC64_DTPREL16_HIGHERA", /* name */
1397 FALSE, /* partial_inplace */
1398 0, /* src_mask */
1399 0xffff, /* dst_mask */
1400 FALSE), /* pcrel_offset */
1401
1402 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */
1403 HOWTO (R_PPC64_DTPREL16_HIGHEST,
1404 48, /* rightshift */
1405 1, /* size (0 = byte, 1 = short, 2 = long) */
1406 16, /* bitsize */
1407 FALSE, /* pc_relative */
1408 0, /* bitpos */
1409 complain_overflow_dont, /* complain_on_overflow */
1410 ppc64_elf_unhandled_reloc, /* special_function */
1411 "R_PPC64_DTPREL16_HIGHEST", /* name */
1412 FALSE, /* partial_inplace */
1413 0, /* src_mask */
1414 0xffff, /* dst_mask */
1415 FALSE), /* pcrel_offset */
1416
1417 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */
1418 HOWTO (R_PPC64_DTPREL16_HIGHESTA,
1419 48, /* rightshift */
1420 1, /* size (0 = byte, 1 = short, 2 = long) */
1421 16, /* bitsize */
1422 FALSE, /* pc_relative */
1423 0, /* bitpos */
1424 complain_overflow_dont, /* complain_on_overflow */
1425 ppc64_elf_unhandled_reloc, /* special_function */
1426 "R_PPC64_DTPREL16_HIGHESTA", /* name */
1427 FALSE, /* partial_inplace */
1428 0, /* src_mask */
1429 0xffff, /* dst_mask */
1430 FALSE), /* pcrel_offset */
1431
1432 /* Like DTPREL16, but for insns with a DS field. */
1433 HOWTO (R_PPC64_DTPREL16_DS,
1434 0, /* rightshift */
1435 1, /* size (0 = byte, 1 = short, 2 = long) */
1436 16, /* bitsize */
1437 FALSE, /* pc_relative */
1438 0, /* bitpos */
1439 complain_overflow_signed, /* complain_on_overflow */
1440 ppc64_elf_unhandled_reloc, /* special_function */
1441 "R_PPC64_DTPREL16_DS", /* name */
1442 FALSE, /* partial_inplace */
1443 0, /* src_mask */
1444 0xfffc, /* dst_mask */
1445 FALSE), /* pcrel_offset */
1446
1447 /* Like DTPREL16_DS, but no overflow. */
1448 HOWTO (R_PPC64_DTPREL16_LO_DS,
1449 0, /* rightshift */
1450 1, /* size (0 = byte, 1 = short, 2 = long) */
1451 16, /* bitsize */
1452 FALSE, /* pc_relative */
1453 0, /* bitpos */
1454 complain_overflow_dont, /* complain_on_overflow */
1455 ppc64_elf_unhandled_reloc, /* special_function */
1456 "R_PPC64_DTPREL16_LO_DS", /* name */
1457 FALSE, /* partial_inplace */
1458 0, /* src_mask */
1459 0xfffc, /* dst_mask */
1460 FALSE), /* pcrel_offset */
1461
1462 /* Computes a tp-relative displacement, the difference between the value of
1463 sym+add and the value of the thread pointer (r13). */
1464 HOWTO (R_PPC64_TPREL64,
1465 0, /* rightshift */
1466 4, /* size (0 = byte, 1 = short, 2 = long) */
1467 64, /* bitsize */
1468 FALSE, /* pc_relative */
1469 0, /* bitpos */
1470 complain_overflow_dont, /* complain_on_overflow */
1471 ppc64_elf_unhandled_reloc, /* special_function */
1472 "R_PPC64_TPREL64", /* name */
1473 FALSE, /* partial_inplace */
1474 0, /* src_mask */
1475 ONES (64), /* dst_mask */
1476 FALSE), /* pcrel_offset */
1477
1478 /* A 16 bit tprel reloc. */
1479 HOWTO (R_PPC64_TPREL16,
1480 0, /* rightshift */
1481 1, /* size (0 = byte, 1 = short, 2 = long) */
1482 16, /* bitsize */
1483 FALSE, /* pc_relative */
1484 0, /* bitpos */
1485 complain_overflow_signed, /* complain_on_overflow */
1486 ppc64_elf_unhandled_reloc, /* special_function */
1487 "R_PPC64_TPREL16", /* name */
1488 FALSE, /* partial_inplace */
1489 0, /* src_mask */
1490 0xffff, /* dst_mask */
1491 FALSE), /* pcrel_offset */
1492
1493 /* Like TPREL16, but no overflow. */
1494 HOWTO (R_PPC64_TPREL16_LO,
1495 0, /* rightshift */
1496 1, /* size (0 = byte, 1 = short, 2 = long) */
1497 16, /* bitsize */
1498 FALSE, /* pc_relative */
1499 0, /* bitpos */
1500 complain_overflow_dont, /* complain_on_overflow */
1501 ppc64_elf_unhandled_reloc, /* special_function */
1502 "R_PPC64_TPREL16_LO", /* name */
1503 FALSE, /* partial_inplace */
1504 0, /* src_mask */
1505 0xffff, /* dst_mask */
1506 FALSE), /* pcrel_offset */
1507
1508 /* Like TPREL16_LO, but next higher group of 16 bits. */
1509 HOWTO (R_PPC64_TPREL16_HI,
1510 16, /* rightshift */
1511 1, /* size (0 = byte, 1 = short, 2 = long) */
1512 16, /* bitsize */
1513 FALSE, /* pc_relative */
1514 0, /* bitpos */
1515 complain_overflow_dont, /* complain_on_overflow */
1516 ppc64_elf_unhandled_reloc, /* special_function */
1517 "R_PPC64_TPREL16_HI", /* name */
1518 FALSE, /* partial_inplace */
1519 0, /* src_mask */
1520 0xffff, /* dst_mask */
1521 FALSE), /* pcrel_offset */
1522
1523 /* Like TPREL16_HI, but adjust for low 16 bits. */
1524 HOWTO (R_PPC64_TPREL16_HA,
1525 16, /* rightshift */
1526 1, /* size (0 = byte, 1 = short, 2 = long) */
1527 16, /* bitsize */
1528 FALSE, /* pc_relative */
1529 0, /* bitpos */
1530 complain_overflow_dont, /* complain_on_overflow */
1531 ppc64_elf_unhandled_reloc, /* special_function */
1532 "R_PPC64_TPREL16_HA", /* name */
1533 FALSE, /* partial_inplace */
1534 0, /* src_mask */
1535 0xffff, /* dst_mask */
1536 FALSE), /* pcrel_offset */
1537
1538 /* Like TPREL16_HI, but next higher group of 16 bits. */
1539 HOWTO (R_PPC64_TPREL16_HIGHER,
1540 32, /* rightshift */
1541 1, /* size (0 = byte, 1 = short, 2 = long) */
1542 16, /* bitsize */
1543 FALSE, /* pc_relative */
1544 0, /* bitpos */
1545 complain_overflow_dont, /* complain_on_overflow */
1546 ppc64_elf_unhandled_reloc, /* special_function */
1547 "R_PPC64_TPREL16_HIGHER", /* name */
1548 FALSE, /* partial_inplace */
1549 0, /* src_mask */
1550 0xffff, /* dst_mask */
1551 FALSE), /* pcrel_offset */
1552
1553 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */
1554 HOWTO (R_PPC64_TPREL16_HIGHERA,
1555 32, /* rightshift */
1556 1, /* size (0 = byte, 1 = short, 2 = long) */
1557 16, /* bitsize */
1558 FALSE, /* pc_relative */
1559 0, /* bitpos */
1560 complain_overflow_dont, /* complain_on_overflow */
1561 ppc64_elf_unhandled_reloc, /* special_function */
1562 "R_PPC64_TPREL16_HIGHERA", /* name */
1563 FALSE, /* partial_inplace */
1564 0, /* src_mask */
1565 0xffff, /* dst_mask */
1566 FALSE), /* pcrel_offset */
1567
1568 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */
1569 HOWTO (R_PPC64_TPREL16_HIGHEST,
1570 48, /* rightshift */
1571 1, /* size (0 = byte, 1 = short, 2 = long) */
1572 16, /* bitsize */
1573 FALSE, /* pc_relative */
1574 0, /* bitpos */
1575 complain_overflow_dont, /* complain_on_overflow */
1576 ppc64_elf_unhandled_reloc, /* special_function */
1577 "R_PPC64_TPREL16_HIGHEST", /* name */
1578 FALSE, /* partial_inplace */
1579 0, /* src_mask */
1580 0xffff, /* dst_mask */
1581 FALSE), /* pcrel_offset */
1582
1583 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */
1584 HOWTO (R_PPC64_TPREL16_HIGHESTA,
1585 48, /* rightshift */
1586 1, /* size (0 = byte, 1 = short, 2 = long) */
1587 16, /* bitsize */
1588 FALSE, /* pc_relative */
1589 0, /* bitpos */
1590 complain_overflow_dont, /* complain_on_overflow */
1591 ppc64_elf_unhandled_reloc, /* special_function */
1592 "R_PPC64_TPREL16_HIGHESTA", /* name */
1593 FALSE, /* partial_inplace */
1594 0, /* src_mask */
1595 0xffff, /* dst_mask */
1596 FALSE), /* pcrel_offset */
1597
1598 /* Like TPREL16, but for insns with a DS field. */
1599 HOWTO (R_PPC64_TPREL16_DS,
1600 0, /* rightshift */
1601 1, /* size (0 = byte, 1 = short, 2 = long) */
1602 16, /* bitsize */
1603 FALSE, /* pc_relative */
1604 0, /* bitpos */
1605 complain_overflow_signed, /* complain_on_overflow */
1606 ppc64_elf_unhandled_reloc, /* special_function */
1607 "R_PPC64_TPREL16_DS", /* name */
1608 FALSE, /* partial_inplace */
1609 0, /* src_mask */
1610 0xfffc, /* dst_mask */
1611 FALSE), /* pcrel_offset */
1612
1613 /* Like TPREL16_DS, but no overflow. */
1614 HOWTO (R_PPC64_TPREL16_LO_DS,
1615 0, /* rightshift */
1616 1, /* size (0 = byte, 1 = short, 2 = long) */
1617 16, /* bitsize */
1618 FALSE, /* pc_relative */
1619 0, /* bitpos */
1620 complain_overflow_dont, /* complain_on_overflow */
1621 ppc64_elf_unhandled_reloc, /* special_function */
1622 "R_PPC64_TPREL16_LO_DS", /* name */
1623 FALSE, /* partial_inplace */
1624 0, /* src_mask */
1625 0xfffc, /* dst_mask */
1626 FALSE), /* pcrel_offset */
1627
1628 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1629 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1630 to the first entry relative to the TOC base (r2). */
1631 HOWTO (R_PPC64_GOT_TLSGD16,
1632 0, /* rightshift */
1633 1, /* size (0 = byte, 1 = short, 2 = long) */
1634 16, /* bitsize */
1635 FALSE, /* pc_relative */
1636 0, /* bitpos */
1637 complain_overflow_signed, /* complain_on_overflow */
1638 ppc64_elf_unhandled_reloc, /* special_function */
1639 "R_PPC64_GOT_TLSGD16", /* name */
1640 FALSE, /* partial_inplace */
1641 0, /* src_mask */
1642 0xffff, /* dst_mask */
1643 FALSE), /* pcrel_offset */
1644
1645 /* Like GOT_TLSGD16, but no overflow. */
1646 HOWTO (R_PPC64_GOT_TLSGD16_LO,
1647 0, /* rightshift */
1648 1, /* size (0 = byte, 1 = short, 2 = long) */
1649 16, /* bitsize */
1650 FALSE, /* pc_relative */
1651 0, /* bitpos */
1652 complain_overflow_dont, /* complain_on_overflow */
1653 ppc64_elf_unhandled_reloc, /* special_function */
1654 "R_PPC64_GOT_TLSGD16_LO", /* name */
1655 FALSE, /* partial_inplace */
1656 0, /* src_mask */
1657 0xffff, /* dst_mask */
1658 FALSE), /* pcrel_offset */
1659
1660 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1661 HOWTO (R_PPC64_GOT_TLSGD16_HI,
1662 16, /* rightshift */
1663 1, /* size (0 = byte, 1 = short, 2 = long) */
1664 16, /* bitsize */
1665 FALSE, /* pc_relative */
1666 0, /* bitpos */
1667 complain_overflow_dont, /* complain_on_overflow */
1668 ppc64_elf_unhandled_reloc, /* special_function */
1669 "R_PPC64_GOT_TLSGD16_HI", /* name */
1670 FALSE, /* partial_inplace */
1671 0, /* src_mask */
1672 0xffff, /* dst_mask */
1673 FALSE), /* pcrel_offset */
1674
1675 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1676 HOWTO (R_PPC64_GOT_TLSGD16_HA,
1677 16, /* rightshift */
1678 1, /* size (0 = byte, 1 = short, 2 = long) */
1679 16, /* bitsize */
1680 FALSE, /* pc_relative */
1681 0, /* bitpos */
1682 complain_overflow_dont, /* complain_on_overflow */
1683 ppc64_elf_unhandled_reloc, /* special_function */
1684 "R_PPC64_GOT_TLSGD16_HA", /* name */
1685 FALSE, /* partial_inplace */
1686 0, /* src_mask */
1687 0xffff, /* dst_mask */
1688 FALSE), /* pcrel_offset */
1689
1690 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1691 with values (sym+add)@dtpmod and zero, and computes the offset to the
1692 first entry relative to the TOC base (r2). */
1693 HOWTO (R_PPC64_GOT_TLSLD16,
1694 0, /* rightshift */
1695 1, /* size (0 = byte, 1 = short, 2 = long) */
1696 16, /* bitsize */
1697 FALSE, /* pc_relative */
1698 0, /* bitpos */
1699 complain_overflow_signed, /* complain_on_overflow */
1700 ppc64_elf_unhandled_reloc, /* special_function */
1701 "R_PPC64_GOT_TLSLD16", /* name */
1702 FALSE, /* partial_inplace */
1703 0, /* src_mask */
1704 0xffff, /* dst_mask */
1705 FALSE), /* pcrel_offset */
1706
1707 /* Like GOT_TLSLD16, but no overflow. */
1708 HOWTO (R_PPC64_GOT_TLSLD16_LO,
1709 0, /* rightshift */
1710 1, /* size (0 = byte, 1 = short, 2 = long) */
1711 16, /* bitsize */
1712 FALSE, /* pc_relative */
1713 0, /* bitpos */
1714 complain_overflow_dont, /* complain_on_overflow */
1715 ppc64_elf_unhandled_reloc, /* special_function */
1716 "R_PPC64_GOT_TLSLD16_LO", /* name */
1717 FALSE, /* partial_inplace */
1718 0, /* src_mask */
1719 0xffff, /* dst_mask */
1720 FALSE), /* pcrel_offset */
1721
1722 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1723 HOWTO (R_PPC64_GOT_TLSLD16_HI,
1724 16, /* rightshift */
1725 1, /* size (0 = byte, 1 = short, 2 = long) */
1726 16, /* bitsize */
1727 FALSE, /* pc_relative */
1728 0, /* bitpos */
1729 complain_overflow_dont, /* complain_on_overflow */
1730 ppc64_elf_unhandled_reloc, /* special_function */
1731 "R_PPC64_GOT_TLSLD16_HI", /* name */
1732 FALSE, /* partial_inplace */
1733 0, /* src_mask */
1734 0xffff, /* dst_mask */
1735 FALSE), /* pcrel_offset */
1736
1737 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1738 HOWTO (R_PPC64_GOT_TLSLD16_HA,
1739 16, /* rightshift */
1740 1, /* size (0 = byte, 1 = short, 2 = long) */
1741 16, /* bitsize */
1742 FALSE, /* pc_relative */
1743 0, /* bitpos */
1744 complain_overflow_dont, /* complain_on_overflow */
1745 ppc64_elf_unhandled_reloc, /* special_function */
1746 "R_PPC64_GOT_TLSLD16_HA", /* name */
1747 FALSE, /* partial_inplace */
1748 0, /* src_mask */
1749 0xffff, /* dst_mask */
1750 FALSE), /* pcrel_offset */
1751
1752 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1753 the offset to the entry relative to the TOC base (r2). */
1754 HOWTO (R_PPC64_GOT_DTPREL16_DS,
1755 0, /* rightshift */
1756 1, /* size (0 = byte, 1 = short, 2 = long) */
1757 16, /* bitsize */
1758 FALSE, /* pc_relative */
1759 0, /* bitpos */
1760 complain_overflow_signed, /* complain_on_overflow */
1761 ppc64_elf_unhandled_reloc, /* special_function */
1762 "R_PPC64_GOT_DTPREL16_DS", /* name */
1763 FALSE, /* partial_inplace */
1764 0, /* src_mask */
1765 0xfffc, /* dst_mask */
1766 FALSE), /* pcrel_offset */
1767
1768 /* Like GOT_DTPREL16_DS, but no overflow. */
1769 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS,
1770 0, /* rightshift */
1771 1, /* size (0 = byte, 1 = short, 2 = long) */
1772 16, /* bitsize */
1773 FALSE, /* pc_relative */
1774 0, /* bitpos */
1775 complain_overflow_dont, /* complain_on_overflow */
1776 ppc64_elf_unhandled_reloc, /* special_function */
1777 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */
1778 FALSE, /* partial_inplace */
1779 0, /* src_mask */
1780 0xfffc, /* dst_mask */
1781 FALSE), /* pcrel_offset */
1782
1783 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */
1784 HOWTO (R_PPC64_GOT_DTPREL16_HI,
1785 16, /* rightshift */
1786 1, /* size (0 = byte, 1 = short, 2 = long) */
1787 16, /* bitsize */
1788 FALSE, /* pc_relative */
1789 0, /* bitpos */
1790 complain_overflow_dont, /* complain_on_overflow */
1791 ppc64_elf_unhandled_reloc, /* special_function */
1792 "R_PPC64_GOT_DTPREL16_HI", /* name */
1793 FALSE, /* partial_inplace */
1794 0, /* src_mask */
1795 0xffff, /* dst_mask */
1796 FALSE), /* pcrel_offset */
1797
1798 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1799 HOWTO (R_PPC64_GOT_DTPREL16_HA,
1800 16, /* rightshift */
1801 1, /* size (0 = byte, 1 = short, 2 = long) */
1802 16, /* bitsize */
1803 FALSE, /* pc_relative */
1804 0, /* bitpos */
1805 complain_overflow_dont, /* complain_on_overflow */
1806 ppc64_elf_unhandled_reloc, /* special_function */
1807 "R_PPC64_GOT_DTPREL16_HA", /* name */
1808 FALSE, /* partial_inplace */
1809 0, /* src_mask */
1810 0xffff, /* dst_mask */
1811 FALSE), /* pcrel_offset */
1812
1813 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1814 offset to the entry relative to the TOC base (r2). */
1815 HOWTO (R_PPC64_GOT_TPREL16_DS,
1816 0, /* rightshift */
1817 1, /* size (0 = byte, 1 = short, 2 = long) */
1818 16, /* bitsize */
1819 FALSE, /* pc_relative */
1820 0, /* bitpos */
1821 complain_overflow_signed, /* complain_on_overflow */
1822 ppc64_elf_unhandled_reloc, /* special_function */
1823 "R_PPC64_GOT_TPREL16_DS", /* name */
1824 FALSE, /* partial_inplace */
1825 0, /* src_mask */
1826 0xfffc, /* dst_mask */
1827 FALSE), /* pcrel_offset */
1828
1829 /* Like GOT_TPREL16_DS, but no overflow. */
1830 HOWTO (R_PPC64_GOT_TPREL16_LO_DS,
1831 0, /* rightshift */
1832 1, /* size (0 = byte, 1 = short, 2 = long) */
1833 16, /* bitsize */
1834 FALSE, /* pc_relative */
1835 0, /* bitpos */
1836 complain_overflow_dont, /* complain_on_overflow */
1837 ppc64_elf_unhandled_reloc, /* special_function */
1838 "R_PPC64_GOT_TPREL16_LO_DS", /* name */
1839 FALSE, /* partial_inplace */
1840 0, /* src_mask */
1841 0xfffc, /* dst_mask */
1842 FALSE), /* pcrel_offset */
1843
1844 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */
1845 HOWTO (R_PPC64_GOT_TPREL16_HI,
1846 16, /* rightshift */
1847 1, /* size (0 = byte, 1 = short, 2 = long) */
1848 16, /* bitsize */
1849 FALSE, /* pc_relative */
1850 0, /* bitpos */
1851 complain_overflow_dont, /* complain_on_overflow */
1852 ppc64_elf_unhandled_reloc, /* special_function */
1853 "R_PPC64_GOT_TPREL16_HI", /* name */
1854 FALSE, /* partial_inplace */
1855 0, /* src_mask */
1856 0xffff, /* dst_mask */
1857 FALSE), /* pcrel_offset */
1858
1859 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1860 HOWTO (R_PPC64_GOT_TPREL16_HA,
1861 16, /* rightshift */
1862 1, /* size (0 = byte, 1 = short, 2 = long) */
1863 16, /* bitsize */
1864 FALSE, /* pc_relative */
1865 0, /* bitpos */
1866 complain_overflow_dont, /* complain_on_overflow */
1867 ppc64_elf_unhandled_reloc, /* special_function */
1868 "R_PPC64_GOT_TPREL16_HA", /* name */
1869 FALSE, /* partial_inplace */
1870 0, /* src_mask */
1871 0xffff, /* dst_mask */
1872 FALSE), /* pcrel_offset */
1873
1874 /* GNU extension to record C++ vtable hierarchy. */
1875 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */
1876 0, /* rightshift */
1877 0, /* size (0 = byte, 1 = short, 2 = long) */
1878 0, /* bitsize */
1879 FALSE, /* pc_relative */
1880 0, /* bitpos */
1881 complain_overflow_dont, /* complain_on_overflow */
1882 NULL, /* special_function */
1883 "R_PPC64_GNU_VTINHERIT", /* name */
1884 FALSE, /* partial_inplace */
1885 0, /* src_mask */
1886 0, /* dst_mask */
1887 FALSE), /* pcrel_offset */
1888
1889 /* GNU extension to record C++ vtable member usage. */
1890 HOWTO (R_PPC64_GNU_VTENTRY, /* type */
1891 0, /* rightshift */
1892 0, /* size (0 = byte, 1 = short, 2 = long) */
1893 0, /* bitsize */
1894 FALSE, /* pc_relative */
1895 0, /* bitpos */
1896 complain_overflow_dont, /* complain_on_overflow */
1897 NULL, /* special_function */
1898 "R_PPC64_GNU_VTENTRY", /* name */
1899 FALSE, /* partial_inplace */
1900 0, /* src_mask */
1901 0, /* dst_mask */
1902 FALSE), /* pcrel_offset */
1903 };
1904
1905
1906 /* Initialize the ppc64_elf_howto_table, so that linear accesses can
1907 be done. */
1908
1909 static void
ppc_howto_init(void)1910 ppc_howto_init (void)
1911 {
1912 unsigned int i, type;
1913
1914 for (i = 0;
1915 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]);
1916 i++)
1917 {
1918 type = ppc64_elf_howto_raw[i].type;
1919 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table)
1920 / sizeof (ppc64_elf_howto_table[0])));
1921 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i];
1922 }
1923 }
1924
1925 static reloc_howto_type *
ppc64_elf_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)1926 ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
1927 bfd_reloc_code_real_type code)
1928 {
1929 enum elf_ppc64_reloc_type r = R_PPC64_NONE;
1930
1931 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
1932 /* Initialize howto table if needed. */
1933 ppc_howto_init ();
1934
1935 switch (code)
1936 {
1937 default:
1938 return NULL;
1939
1940 case BFD_RELOC_NONE: r = R_PPC64_NONE;
1941 break;
1942 case BFD_RELOC_32: r = R_PPC64_ADDR32;
1943 break;
1944 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24;
1945 break;
1946 case BFD_RELOC_16: r = R_PPC64_ADDR16;
1947 break;
1948 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO;
1949 break;
1950 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI;
1951 break;
1952 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA;
1953 break;
1954 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14;
1955 break;
1956 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN;
1957 break;
1958 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN;
1959 break;
1960 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24;
1961 break;
1962 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14;
1963 break;
1964 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN;
1965 break;
1966 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN;
1967 break;
1968 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16;
1969 break;
1970 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO;
1971 break;
1972 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI;
1973 break;
1974 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA;
1975 break;
1976 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY;
1977 break;
1978 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT;
1979 break;
1980 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32;
1981 break;
1982 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32;
1983 break;
1984 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32;
1985 break;
1986 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO;
1987 break;
1988 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI;
1989 break;
1990 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA;
1991 break;
1992 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF;
1993 break;
1994 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO;
1995 break;
1996 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI;
1997 break;
1998 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA;
1999 break;
2000 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64;
2001 break;
2002 case BFD_RELOC_64: r = R_PPC64_ADDR64;
2003 break;
2004 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER;
2005 break;
2006 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA;
2007 break;
2008 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST;
2009 break;
2010 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA;
2011 break;
2012 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64;
2013 break;
2014 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64;
2015 break;
2016 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64;
2017 break;
2018 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16;
2019 break;
2020 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO;
2021 break;
2022 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI;
2023 break;
2024 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA;
2025 break;
2026 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC;
2027 break;
2028 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16;
2029 break;
2030 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO;
2031 break;
2032 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI;
2033 break;
2034 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA;
2035 break;
2036 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS;
2037 break;
2038 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS;
2039 break;
2040 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS;
2041 break;
2042 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS;
2043 break;
2044 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS;
2045 break;
2046 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS;
2047 break;
2048 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS;
2049 break;
2050 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS;
2051 break;
2052 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS;
2053 break;
2054 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS;
2055 break;
2056 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS;
2057 break;
2058 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS;
2059 break;
2060 case BFD_RELOC_PPC_TLSGD: r = R_PPC64_TLSGD;
2061 break;
2062 case BFD_RELOC_PPC_TLSLD: r = R_PPC64_TLSLD;
2063 break;
2064 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64;
2065 break;
2066 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16;
2067 break;
2068 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO;
2069 break;
2070 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI;
2071 break;
2072 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA;
2073 break;
2074 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64;
2075 break;
2076 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16;
2077 break;
2078 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO;
2079 break;
2080 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI;
2081 break;
2082 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA;
2083 break;
2084 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64;
2085 break;
2086 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16;
2087 break;
2088 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO;
2089 break;
2090 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI;
2091 break;
2092 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA;
2093 break;
2094 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16;
2095 break;
2096 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO;
2097 break;
2098 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI;
2099 break;
2100 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA;
2101 break;
2102 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS;
2103 break;
2104 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS;
2105 break;
2106 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI;
2107 break;
2108 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA;
2109 break;
2110 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS;
2111 break;
2112 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS;
2113 break;
2114 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI;
2115 break;
2116 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA;
2117 break;
2118 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS;
2119 break;
2120 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS;
2121 break;
2122 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER;
2123 break;
2124 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA;
2125 break;
2126 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST;
2127 break;
2128 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA;
2129 break;
2130 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS;
2131 break;
2132 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS;
2133 break;
2134 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER;
2135 break;
2136 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA;
2137 break;
2138 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST;
2139 break;
2140 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA;
2141 break;
2142 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT;
2143 break;
2144 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY;
2145 break;
2146 }
2147
2148 return ppc64_elf_howto_table[r];
2149 };
2150
2151 static reloc_howto_type *
ppc64_elf_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)2152 ppc64_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
2153 const char *r_name)
2154 {
2155 unsigned int i;
2156
2157 for (i = 0;
2158 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]);
2159 i++)
2160 if (ppc64_elf_howto_raw[i].name != NULL
2161 && strcasecmp (ppc64_elf_howto_raw[i].name, r_name) == 0)
2162 return &ppc64_elf_howto_raw[i];
2163
2164 return NULL;
2165 }
2166
2167 /* Set the howto pointer for a PowerPC ELF reloc. */
2168
2169 static void
ppc64_elf_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)2170 ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
2171 Elf_Internal_Rela *dst)
2172 {
2173 unsigned int type;
2174
2175 /* Initialize howto table if needed. */
2176 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
2177 ppc_howto_init ();
2178
2179 type = ELF64_R_TYPE (dst->r_info);
2180 if (type >= (sizeof (ppc64_elf_howto_table)
2181 / sizeof (ppc64_elf_howto_table[0])))
2182 {
2183 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
2184 abfd, (int) type);
2185 type = R_PPC64_NONE;
2186 }
2187 cache_ptr->howto = ppc64_elf_howto_table[type];
2188 }
2189
2190 /* Handle the R_PPC64_ADDR16_HA and similar relocs. */
2191
2192 static bfd_reloc_status_type
ppc64_elf_ha_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2193 ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2194 void *data, asection *input_section,
2195 bfd *output_bfd, char **error_message)
2196 {
2197 /* If this is a relocatable link (output_bfd test tells us), just
2198 call the generic function. Any adjustment will be done at final
2199 link time. */
2200 if (output_bfd != NULL)
2201 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2202 input_section, output_bfd, error_message);
2203
2204 /* Adjust the addend for sign extension of the low 16 bits.
2205 We won't actually be using the low 16 bits, so trashing them
2206 doesn't matter. */
2207 reloc_entry->addend += 0x8000;
2208 return bfd_reloc_continue;
2209 }
2210
2211 static bfd_reloc_status_type
ppc64_elf_branch_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2212 ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2213 void *data, asection *input_section,
2214 bfd *output_bfd, char **error_message)
2215 {
2216 if (output_bfd != NULL)
2217 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2218 input_section, output_bfd, error_message);
2219
2220 if (strcmp (symbol->section->name, ".opd") == 0
2221 && (symbol->section->owner->flags & DYNAMIC) == 0)
2222 {
2223 bfd_vma dest = opd_entry_value (symbol->section,
2224 symbol->value + reloc_entry->addend,
2225 NULL, NULL);
2226 if (dest != (bfd_vma) -1)
2227 reloc_entry->addend = dest - (symbol->value
2228 + symbol->section->output_section->vma
2229 + symbol->section->output_offset);
2230 }
2231 return bfd_reloc_continue;
2232 }
2233
2234 static bfd_reloc_status_type
ppc64_elf_brtaken_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2235 ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2236 void *data, asection *input_section,
2237 bfd *output_bfd, char **error_message)
2238 {
2239 long insn;
2240 enum elf_ppc64_reloc_type r_type;
2241 bfd_size_type octets;
2242 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
2243 bfd_boolean is_power4 = FALSE;
2244
2245 /* If this is a relocatable link (output_bfd test tells us), just
2246 call the generic function. Any adjustment will be done at final
2247 link time. */
2248 if (output_bfd != NULL)
2249 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2250 input_section, output_bfd, error_message);
2251
2252 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
2253 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets);
2254 insn &= ~(0x01 << 21);
2255 r_type = reloc_entry->howto->type;
2256 if (r_type == R_PPC64_ADDR14_BRTAKEN
2257 || r_type == R_PPC64_REL14_BRTAKEN)
2258 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
2259
2260 if (is_power4)
2261 {
2262 /* Set 'a' bit. This is 0b00010 in BO field for branch
2263 on CR(BI) insns (BO == 001at or 011at), and 0b01000
2264 for branch on CTR insns (BO == 1a00t or 1a01t). */
2265 if ((insn & (0x14 << 21)) == (0x04 << 21))
2266 insn |= 0x02 << 21;
2267 else if ((insn & (0x14 << 21)) == (0x10 << 21))
2268 insn |= 0x08 << 21;
2269 else
2270 goto out;
2271 }
2272 else
2273 {
2274 bfd_vma target = 0;
2275 bfd_vma from;
2276
2277 if (!bfd_is_com_section (symbol->section))
2278 target = symbol->value;
2279 target += symbol->section->output_section->vma;
2280 target += symbol->section->output_offset;
2281 target += reloc_entry->addend;
2282
2283 from = (reloc_entry->address
2284 + input_section->output_offset
2285 + input_section->output_section->vma);
2286
2287 /* Invert 'y' bit if not the default. */
2288 if ((bfd_signed_vma) (target - from) < 0)
2289 insn ^= 0x01 << 21;
2290 }
2291 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets);
2292 out:
2293 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data,
2294 input_section, output_bfd, error_message);
2295 }
2296
2297 static bfd_reloc_status_type
ppc64_elf_sectoff_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2298 ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2299 void *data, asection *input_section,
2300 bfd *output_bfd, char **error_message)
2301 {
2302 /* If this is a relocatable link (output_bfd test tells us), just
2303 call the generic function. Any adjustment will be done at final
2304 link time. */
2305 if (output_bfd != NULL)
2306 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2307 input_section, output_bfd, error_message);
2308
2309 /* Subtract the symbol section base address. */
2310 reloc_entry->addend -= symbol->section->output_section->vma;
2311 return bfd_reloc_continue;
2312 }
2313
2314 static bfd_reloc_status_type
ppc64_elf_sectoff_ha_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2315 ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2316 void *data, asection *input_section,
2317 bfd *output_bfd, char **error_message)
2318 {
2319 /* If this is a relocatable link (output_bfd test tells us), just
2320 call the generic function. Any adjustment will be done at final
2321 link time. */
2322 if (output_bfd != NULL)
2323 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2324 input_section, output_bfd, error_message);
2325
2326 /* Subtract the symbol section base address. */
2327 reloc_entry->addend -= symbol->section->output_section->vma;
2328
2329 /* Adjust the addend for sign extension of the low 16 bits. */
2330 reloc_entry->addend += 0x8000;
2331 return bfd_reloc_continue;
2332 }
2333
2334 static bfd_reloc_status_type
ppc64_elf_toc_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2335 ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2336 void *data, asection *input_section,
2337 bfd *output_bfd, char **error_message)
2338 {
2339 bfd_vma TOCstart;
2340
2341 /* If this is a relocatable link (output_bfd test tells us), just
2342 call the generic function. Any adjustment will be done at final
2343 link time. */
2344 if (output_bfd != NULL)
2345 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2346 input_section, output_bfd, error_message);
2347
2348 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2349 if (TOCstart == 0)
2350 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2351
2352 /* Subtract the TOC base address. */
2353 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
2354 return bfd_reloc_continue;
2355 }
2356
2357 static bfd_reloc_status_type
ppc64_elf_toc_ha_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2358 ppc64_elf_toc_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2359 void *data, asection *input_section,
2360 bfd *output_bfd, char **error_message)
2361 {
2362 bfd_vma TOCstart;
2363
2364 /* If this is a relocatable link (output_bfd test tells us), just
2365 call the generic function. Any adjustment will be done at final
2366 link time. */
2367 if (output_bfd != NULL)
2368 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2369 input_section, output_bfd, error_message);
2370
2371 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2372 if (TOCstart == 0)
2373 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2374
2375 /* Subtract the TOC base address. */
2376 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
2377
2378 /* Adjust the addend for sign extension of the low 16 bits. */
2379 reloc_entry->addend += 0x8000;
2380 return bfd_reloc_continue;
2381 }
2382
2383 static bfd_reloc_status_type
ppc64_elf_toc64_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2384 ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2385 void *data, asection *input_section,
2386 bfd *output_bfd, char **error_message)
2387 {
2388 bfd_vma TOCstart;
2389 bfd_size_type octets;
2390
2391 /* If this is a relocatable link (output_bfd test tells us), just
2392 call the generic function. Any adjustment will be done at final
2393 link time. */
2394 if (output_bfd != NULL)
2395 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2396 input_section, output_bfd, error_message);
2397
2398 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2399 if (TOCstart == 0)
2400 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2401
2402 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
2403 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets);
2404 return bfd_reloc_ok;
2405 }
2406
2407 static bfd_reloc_status_type
ppc64_elf_unhandled_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)2408 ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2409 void *data, asection *input_section,
2410 bfd *output_bfd, char **error_message)
2411 {
2412 /* If this is a relocatable link (output_bfd test tells us), just
2413 call the generic function. Any adjustment will be done at final
2414 link time. */
2415 if (output_bfd != NULL)
2416 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2417 input_section, output_bfd, error_message);
2418
2419 if (error_message != NULL)
2420 {
2421 static char buf[60];
2422 sprintf (buf, "generic linker can't handle %s",
2423 reloc_entry->howto->name);
2424 *error_message = buf;
2425 }
2426 return bfd_reloc_dangerous;
2427 }
2428
2429 struct ppc64_elf_obj_tdata
2430 {
2431 struct elf_obj_tdata elf;
2432
2433 /* Shortcuts to dynamic linker sections. */
2434 asection *got;
2435 asection *relgot;
2436
2437 /* Used during garbage collection. We attach global symbols defined
2438 on removed .opd entries to this section so that the sym is removed. */
2439 asection *deleted_section;
2440
2441 /* TLS local dynamic got entry handling. Suppose for multiple GOT
2442 sections means we potentially need one of these for each input bfd. */
2443 union {
2444 bfd_signed_vma refcount;
2445 bfd_vma offset;
2446 } tlsld_got;
2447
2448 /* A copy of relocs before they are modified for --emit-relocs. */
2449 Elf_Internal_Rela *opd_relocs;
2450 };
2451
2452 #define ppc64_elf_tdata(bfd) \
2453 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any)
2454
2455 #define ppc64_tlsld_got(bfd) \
2456 (&ppc64_elf_tdata (bfd)->tlsld_got)
2457
2458 /* Override the generic function because we store some extras. */
2459
2460 static bfd_boolean
ppc64_elf_mkobject(bfd * abfd)2461 ppc64_elf_mkobject (bfd *abfd)
2462 {
2463 if (abfd->tdata.any == NULL)
2464 {
2465 bfd_size_type amt = sizeof (struct ppc64_elf_obj_tdata);
2466 abfd->tdata.any = bfd_zalloc (abfd, amt);
2467 if (abfd->tdata.any == NULL)
2468 return FALSE;
2469 }
2470 return bfd_elf_mkobject (abfd);
2471 }
2472
2473 /* Return 1 if target is one of ours. */
2474
2475 static bfd_boolean
is_ppc64_elf_target(const struct bfd_target * targ)2476 is_ppc64_elf_target (const struct bfd_target *targ)
2477 {
2478 extern const bfd_target bfd_elf64_powerpc_vec;
2479 extern const bfd_target bfd_elf64_powerpcle_vec;
2480
2481 return targ == &bfd_elf64_powerpc_vec || targ == &bfd_elf64_powerpcle_vec;
2482 }
2483
2484 /* Fix bad default arch selected for a 64 bit input bfd when the
2485 default is 32 bit. */
2486
2487 static bfd_boolean
ppc64_elf_object_p(bfd * abfd)2488 ppc64_elf_object_p (bfd *abfd)
2489 {
2490 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32)
2491 {
2492 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd);
2493
2494 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64)
2495 {
2496 /* Relies on arch after 32 bit default being 64 bit default. */
2497 abfd->arch_info = abfd->arch_info->next;
2498 BFD_ASSERT (abfd->arch_info->bits_per_word == 64);
2499 }
2500 }
2501 return TRUE;
2502 }
2503
2504 /* Support for core dump NOTE sections. */
2505
2506 static bfd_boolean
ppc64_elf_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)2507 ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2508 {
2509 size_t offset, size;
2510
2511 if (note->descsz != 504)
2512 return FALSE;
2513
2514 /* pr_cursig */
2515 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2516
2517 /* pr_pid */
2518 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 32);
2519
2520 /* pr_reg */
2521 offset = 112;
2522 size = 384;
2523
2524 /* Make a ".reg/999" section. */
2525 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2526 size, note->descpos + offset);
2527 }
2528
2529 static bfd_boolean
ppc64_elf_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)2530 ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
2531 {
2532 if (note->descsz != 136)
2533 return FALSE;
2534
2535 elf_tdata (abfd)->core_program
2536 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
2537 elf_tdata (abfd)->core_command
2538 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
2539
2540 return TRUE;
2541 }
2542
2543 static char *
ppc64_elf_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)2544 ppc64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type,
2545 ...)
2546 {
2547 switch (note_type)
2548 {
2549 default:
2550 return NULL;
2551
2552 case NT_PRPSINFO:
2553 {
2554 char data[136];
2555 va_list ap;
2556
2557 va_start (ap, note_type);
2558 memset (data, 0, 40);
2559 strncpy (data + 40, va_arg (ap, const char *), 16);
2560 strncpy (data + 56, va_arg (ap, const char *), 80);
2561 va_end (ap);
2562 return elfcore_write_note (abfd, buf, bufsiz,
2563 "CORE", note_type, data, sizeof (data));
2564 }
2565
2566 case NT_PRSTATUS:
2567 {
2568 char data[504];
2569 va_list ap;
2570 long pid;
2571 int cursig;
2572 const void *greg;
2573
2574 va_start (ap, note_type);
2575 memset (data, 0, 112);
2576 pid = va_arg (ap, long);
2577 bfd_put_32 (abfd, pid, data + 32);
2578 cursig = va_arg (ap, int);
2579 bfd_put_16 (abfd, cursig, data + 12);
2580 greg = va_arg (ap, const void *);
2581 memcpy (data + 112, greg, 384);
2582 memset (data + 496, 0, 8);
2583 va_end (ap);
2584 return elfcore_write_note (abfd, buf, bufsiz,
2585 "CORE", note_type, data, sizeof (data));
2586 }
2587 }
2588 }
2589
2590 /* Merge backend specific data from an object file to the output
2591 object file when linking. */
2592
2593 static bfd_boolean
ppc64_elf_merge_private_bfd_data(bfd * ibfd,bfd * obfd)2594 ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2595 {
2596 /* Check if we have the same endianess. */
2597 if (ibfd->xvec->byteorder != obfd->xvec->byteorder
2598 && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN
2599 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
2600 {
2601 const char *msg;
2602
2603 if (bfd_big_endian (ibfd))
2604 msg = _("%B: compiled for a big endian system "
2605 "and target is little endian");
2606 else
2607 msg = _("%B: compiled for a little endian system "
2608 "and target is big endian");
2609
2610 (*_bfd_error_handler) (msg, ibfd);
2611
2612 bfd_set_error (bfd_error_wrong_format);
2613 return FALSE;
2614 }
2615
2616 return TRUE;
2617 }
2618
2619 /* Add extra PPC sections. */
2620
2621 static const struct bfd_elf_special_section ppc64_elf_special_sections[]=
2622 {
2623 { STRING_COMMA_LEN (".plt"), 0, SHT_NOBITS, 0 },
2624 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
2625 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2626 { STRING_COMMA_LEN (".toc"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2627 { STRING_COMMA_LEN (".toc1"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2628 { STRING_COMMA_LEN (".tocbss"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
2629 { NULL, 0, 0, 0, 0 }
2630 };
2631
2632 enum _ppc64_sec_type {
2633 sec_normal = 0,
2634 sec_opd = 1,
2635 sec_toc = 2
2636 };
2637
2638 struct _ppc64_elf_section_data
2639 {
2640 struct bfd_elf_section_data elf;
2641
2642 /* An array with one entry for each opd function descriptor. */
2643 union
2644 {
2645 /* Points to the function code section for local opd entries. */
2646 asection **opd_func_sec;
2647 /* After editing .opd, adjust references to opd local syms. */
2648 long *opd_adjust;
2649
2650 /* An array for toc sections, indexed by offset/8. */
2651 struct _toc_sec_data
2652 {
2653 /* Specifies the relocation symbol index used at a given toc offset. */
2654 unsigned *symndx;
2655
2656 /* And the relocation addend. */
2657 bfd_vma *add;
2658 } toc;
2659 } u;
2660
2661 enum _ppc64_sec_type sec_type:2;
2662
2663 /* Flag set when small branches are detected. Used to
2664 select suitable defaults for the stub group size. */
2665 unsigned int has_14bit_branch:1;
2666 };
2667
2668 #define ppc64_elf_section_data(sec) \
2669 ((struct _ppc64_elf_section_data *) elf_section_data (sec))
2670
2671 static bfd_boolean
ppc64_elf_new_section_hook(bfd * abfd,asection * sec)2672 ppc64_elf_new_section_hook (bfd *abfd, asection *sec)
2673 {
2674 if (!sec->used_by_bfd)
2675 {
2676 struct _ppc64_elf_section_data *sdata;
2677 bfd_size_type amt = sizeof (*sdata);
2678
2679 sdata = bfd_zalloc (abfd, amt);
2680 if (sdata == NULL)
2681 return FALSE;
2682 sec->used_by_bfd = sdata;
2683 }
2684
2685 return _bfd_elf_new_section_hook (abfd, sec);
2686 }
2687
2688 static void *
get_opd_info(asection * sec)2689 get_opd_info (asection * sec)
2690 {
2691 if (sec != NULL
2692 && ppc64_elf_section_data (sec) != NULL
2693 && ppc64_elf_section_data (sec)->sec_type == sec_opd)
2694 return ppc64_elf_section_data (sec)->u.opd_adjust;
2695 return NULL;
2696 }
2697
2698 /* Parameters for the qsort hook. */
2699 static asection *synthetic_opd;
2700 static bfd_boolean synthetic_relocatable;
2701
2702 /* qsort comparison function for ppc64_elf_get_synthetic_symtab. */
2703
2704 static int
compare_symbols(const void * ap,const void * bp)2705 compare_symbols (const void *ap, const void *bp)
2706 {
2707 const asymbol *a = * (const asymbol **) ap;
2708 const asymbol *b = * (const asymbol **) bp;
2709
2710 /* Section symbols first. */
2711 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM))
2712 return -1;
2713 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM))
2714 return 1;
2715
2716 /* then .opd symbols. */
2717 if (a->section == synthetic_opd && b->section != synthetic_opd)
2718 return -1;
2719 if (a->section != synthetic_opd && b->section == synthetic_opd)
2720 return 1;
2721
2722 /* then other code symbols. */
2723 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2724 == (SEC_CODE | SEC_ALLOC)
2725 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2726 != (SEC_CODE | SEC_ALLOC))
2727 return -1;
2728
2729 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2730 != (SEC_CODE | SEC_ALLOC)
2731 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2732 == (SEC_CODE | SEC_ALLOC))
2733 return 1;
2734
2735 if (synthetic_relocatable)
2736 {
2737 if (a->section->id < b->section->id)
2738 return -1;
2739
2740 if (a->section->id > b->section->id)
2741 return 1;
2742 }
2743
2744 if (a->value + a->section->vma < b->value + b->section->vma)
2745 return -1;
2746
2747 if (a->value + a->section->vma > b->value + b->section->vma)
2748 return 1;
2749
2750 /* For syms with the same value, prefer strong dynamic global function
2751 syms over other syms. */
2752 if ((a->flags & BSF_GLOBAL) != 0 && (b->flags & BSF_GLOBAL) == 0)
2753 return -1;
2754
2755 if ((a->flags & BSF_GLOBAL) == 0 && (b->flags & BSF_GLOBAL) != 0)
2756 return 1;
2757
2758 if ((a->flags & BSF_FUNCTION) != 0 && (b->flags & BSF_FUNCTION) == 0)
2759 return -1;
2760
2761 if ((a->flags & BSF_FUNCTION) == 0 && (b->flags & BSF_FUNCTION) != 0)
2762 return 1;
2763
2764 if ((a->flags & BSF_WEAK) == 0 && (b->flags & BSF_WEAK) != 0)
2765 return -1;
2766
2767 if ((a->flags & BSF_WEAK) != 0 && (b->flags & BSF_WEAK) == 0)
2768 return 1;
2769
2770 if ((a->flags & BSF_DYNAMIC) != 0 && (b->flags & BSF_DYNAMIC) == 0)
2771 return -1;
2772
2773 if ((a->flags & BSF_DYNAMIC) == 0 && (b->flags & BSF_DYNAMIC) != 0)
2774 return 1;
2775
2776 return 0;
2777 }
2778
2779 /* Search SYMS for a symbol of the given VALUE. */
2780
2781 static asymbol *
sym_exists_at(asymbol ** syms,long lo,long hi,int id,bfd_vma value)2782 sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value)
2783 {
2784 long mid;
2785
2786 if (id == -1)
2787 {
2788 while (lo < hi)
2789 {
2790 mid = (lo + hi) >> 1;
2791 if (syms[mid]->value + syms[mid]->section->vma < value)
2792 lo = mid + 1;
2793 else if (syms[mid]->value + syms[mid]->section->vma > value)
2794 hi = mid;
2795 else
2796 return syms[mid];
2797 }
2798 }
2799 else
2800 {
2801 while (lo < hi)
2802 {
2803 mid = (lo + hi) >> 1;
2804 if (syms[mid]->section->id < id)
2805 lo = mid + 1;
2806 else if (syms[mid]->section->id > id)
2807 hi = mid;
2808 else if (syms[mid]->value < value)
2809 lo = mid + 1;
2810 else if (syms[mid]->value > value)
2811 hi = mid;
2812 else
2813 return syms[mid];
2814 }
2815 }
2816 return NULL;
2817 }
2818
2819 /* Create synthetic symbols, effectively restoring "dot-symbol" function
2820 entry syms. */
2821
2822 static long
ppc64_elf_get_synthetic_symtab(bfd * abfd,long static_count,asymbol ** static_syms,long dyn_count,asymbol ** dyn_syms,asymbol ** ret)2823 ppc64_elf_get_synthetic_symtab (bfd *abfd,
2824 long static_count, asymbol **static_syms,
2825 long dyn_count, asymbol **dyn_syms,
2826 asymbol **ret)
2827 {
2828 asymbol *s;
2829 long i;
2830 long count;
2831 char *names;
2832 long symcount, codesecsym, codesecsymend, secsymend, opdsymend;
2833 asection *opd;
2834 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0;
2835 asymbol **syms;
2836
2837 *ret = NULL;
2838
2839 opd = bfd_get_section_by_name (abfd, ".opd");
2840 if (opd == NULL)
2841 return 0;
2842
2843 symcount = static_count;
2844 if (!relocatable)
2845 symcount += dyn_count;
2846 if (symcount == 0)
2847 return 0;
2848
2849 syms = bfd_malloc ((symcount + 1) * sizeof (*syms));
2850 if (syms == NULL)
2851 return -1;
2852
2853 if (!relocatable && static_count != 0 && dyn_count != 0)
2854 {
2855 /* Use both symbol tables. */
2856 memcpy (syms, static_syms, static_count * sizeof (*syms));
2857 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms));
2858 }
2859 else if (!relocatable && static_count == 0)
2860 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms));
2861 else
2862 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms));
2863
2864 synthetic_opd = opd;
2865 synthetic_relocatable = relocatable;
2866 qsort (syms, symcount, sizeof (*syms), compare_symbols);
2867
2868 if (!relocatable && symcount > 1)
2869 {
2870 long j;
2871 /* Trim duplicate syms, since we may have merged the normal and
2872 dynamic symbols. Actually, we only care about syms that have
2873 different values, so trim any with the same value. */
2874 for (i = 1, j = 1; i < symcount; ++i)
2875 if (syms[i - 1]->value + syms[i - 1]->section->vma
2876 != syms[i]->value + syms[i]->section->vma)
2877 syms[j++] = syms[i];
2878 symcount = j;
2879 }
2880
2881 i = 0;
2882 if (syms[i]->section == opd)
2883 ++i;
2884 codesecsym = i;
2885
2886 for (; i < symcount; ++i)
2887 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2888 != (SEC_CODE | SEC_ALLOC))
2889 || (syms[i]->flags & BSF_SECTION_SYM) == 0)
2890 break;
2891 codesecsymend = i;
2892
2893 for (; i < symcount; ++i)
2894 if ((syms[i]->flags & BSF_SECTION_SYM) == 0)
2895 break;
2896 secsymend = i;
2897
2898 for (; i < symcount; ++i)
2899 if (syms[i]->section != opd)
2900 break;
2901 opdsymend = i;
2902
2903 for (; i < symcount; ++i)
2904 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2905 != (SEC_CODE | SEC_ALLOC))
2906 break;
2907 symcount = i;
2908
2909 count = 0;
2910 if (opdsymend == secsymend)
2911 goto done;
2912
2913 if (relocatable)
2914 {
2915 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
2916 arelent *r;
2917 size_t size;
2918 long relcount;
2919
2920 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
2921 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0;
2922 if (relcount == 0)
2923 goto done;
2924
2925 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE))
2926 {
2927 count = -1;
2928 goto done;
2929 }
2930
2931 size = 0;
2932 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i)
2933 {
2934 asymbol *sym;
2935
2936 while (r < opd->relocation + relcount
2937 && r->address < syms[i]->value + opd->vma)
2938 ++r;
2939
2940 if (r == opd->relocation + relcount)
2941 break;
2942
2943 if (r->address != syms[i]->value + opd->vma)
2944 continue;
2945
2946 if (r->howto->type != R_PPC64_ADDR64)
2947 continue;
2948
2949 sym = *r->sym_ptr_ptr;
2950 if (!sym_exists_at (syms, opdsymend, symcount,
2951 sym->section->id, sym->value + r->addend))
2952 {
2953 ++count;
2954 size += sizeof (asymbol);
2955 size += strlen (syms[i]->name) + 2;
2956 }
2957 }
2958
2959 s = *ret = bfd_malloc (size);
2960 if (s == NULL)
2961 {
2962 count = -1;
2963 goto done;
2964 }
2965
2966 names = (char *) (s + count);
2967
2968 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i)
2969 {
2970 asymbol *sym;
2971
2972 while (r < opd->relocation + relcount
2973 && r->address < syms[i]->value + opd->vma)
2974 ++r;
2975
2976 if (r == opd->relocation + relcount)
2977 break;
2978
2979 if (r->address != syms[i]->value + opd->vma)
2980 continue;
2981
2982 if (r->howto->type != R_PPC64_ADDR64)
2983 continue;
2984
2985 sym = *r->sym_ptr_ptr;
2986 if (!sym_exists_at (syms, opdsymend, symcount,
2987 sym->section->id, sym->value + r->addend))
2988 {
2989 size_t len;
2990
2991 *s = *syms[i];
2992 s->section = sym->section;
2993 s->value = sym->value + r->addend;
2994 s->name = names;
2995 *names++ = '.';
2996 len = strlen (syms[i]->name);
2997 memcpy (names, syms[i]->name, len + 1);
2998 names += len + 1;
2999 s++;
3000 }
3001 }
3002 }
3003 else
3004 {
3005 bfd_byte *contents;
3006 size_t size;
3007
3008 if (!bfd_malloc_and_get_section (abfd, opd, &contents))
3009 {
3010 if (contents)
3011 {
3012 free_contents_and_exit:
3013 free (contents);
3014 }
3015 count = -1;
3016 goto done;
3017 }
3018
3019 size = 0;
3020 for (i = secsymend; i < opdsymend; ++i)
3021 {
3022 bfd_vma ent;
3023
3024 ent = bfd_get_64 (abfd, contents + syms[i]->value);
3025 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
3026 {
3027 ++count;
3028 size += sizeof (asymbol);
3029 size += strlen (syms[i]->name) + 2;
3030 }
3031 }
3032
3033 s = *ret = bfd_malloc (size);
3034 if (s == NULL)
3035 goto free_contents_and_exit;
3036
3037 names = (char *) (s + count);
3038
3039 for (i = secsymend; i < opdsymend; ++i)
3040 {
3041 bfd_vma ent;
3042
3043 ent = bfd_get_64 (abfd, contents + syms[i]->value);
3044 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
3045 {
3046 long lo, hi;
3047 size_t len;
3048 asection *sec = abfd->sections;
3049
3050 *s = *syms[i];
3051 lo = codesecsym;
3052 hi = codesecsymend;
3053 while (lo < hi)
3054 {
3055 long mid = (lo + hi) >> 1;
3056 if (syms[mid]->section->vma < ent)
3057 lo = mid + 1;
3058 else if (syms[mid]->section->vma > ent)
3059 hi = mid;
3060 else
3061 {
3062 sec = syms[mid]->section;
3063 break;
3064 }
3065 }
3066
3067 if (lo >= hi && lo > codesecsym)
3068 sec = syms[lo - 1]->section;
3069
3070 for (; sec != NULL; sec = sec->next)
3071 {
3072 if (sec->vma > ent)
3073 break;
3074 if ((sec->flags & SEC_ALLOC) == 0
3075 || (sec->flags & SEC_LOAD) == 0)
3076 break;
3077 if ((sec->flags & SEC_CODE) != 0)
3078 s->section = sec;
3079 }
3080 s->value = ent - s->section->vma;
3081 s->name = names;
3082 *names++ = '.';
3083 len = strlen (syms[i]->name);
3084 memcpy (names, syms[i]->name, len + 1);
3085 names += len + 1;
3086 s++;
3087 }
3088 }
3089 free (contents);
3090 }
3091
3092 done:
3093 free (syms);
3094 return count;
3095 }
3096
3097 /* The following functions are specific to the ELF linker, while
3098 functions above are used generally. Those named ppc64_elf_* are
3099 called by the main ELF linker code. They appear in this file more
3100 or less in the order in which they are called. eg.
3101 ppc64_elf_check_relocs is called early in the link process,
3102 ppc64_elf_finish_dynamic_sections is one of the last functions
3103 called.
3104
3105 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that
3106 functions have both a function code symbol and a function descriptor
3107 symbol. A call to foo in a relocatable object file looks like:
3108
3109 . .text
3110 . x:
3111 . bl .foo
3112 . nop
3113
3114 The function definition in another object file might be:
3115
3116 . .section .opd
3117 . foo: .quad .foo
3118 . .quad .TOC.@tocbase
3119 . .quad 0
3120 .
3121 . .text
3122 . .foo: blr
3123
3124 When the linker resolves the call during a static link, the branch
3125 unsurprisingly just goes to .foo and the .opd information is unused.
3126 If the function definition is in a shared library, things are a little
3127 different: The call goes via a plt call stub, the opd information gets
3128 copied to the plt, and the linker patches the nop.
3129
3130 . x:
3131 . bl .foo_stub
3132 . ld 2,40(1)
3133 .
3134 .
3135 . .foo_stub:
3136 . addis 12,2,Lfoo@toc@ha # in practice, the call stub
3137 . addi 12,12,Lfoo@toc@l # is slightly optimized, but
3138 . std 2,40(1) # this is the general idea
3139 . ld 11,0(12)
3140 . ld 2,8(12)
3141 . mtctr 11
3142 . ld 11,16(12)
3143 . bctr
3144 .
3145 . .section .plt
3146 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo)
3147
3148 The "reloc ()" notation is supposed to indicate that the linker emits
3149 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd
3150 copying.
3151
3152 What are the difficulties here? Well, firstly, the relocations
3153 examined by the linker in check_relocs are against the function code
3154 sym .foo, while the dynamic relocation in the plt is emitted against
3155 the function descriptor symbol, foo. Somewhere along the line, we need
3156 to carefully copy dynamic link information from one symbol to the other.
3157 Secondly, the generic part of the elf linker will make .foo a dynamic
3158 symbol as is normal for most other backends. We need foo dynamic
3159 instead, at least for an application final link. However, when
3160 creating a shared library containing foo, we need to have both symbols
3161 dynamic so that references to .foo are satisfied during the early
3162 stages of linking. Otherwise the linker might decide to pull in a
3163 definition from some other object, eg. a static library.
3164
3165 Update: As of August 2004, we support a new convention. Function
3166 calls may use the function descriptor symbol, ie. "bl foo". This
3167 behaves exactly as "bl .foo". */
3168
3169 /* The linker needs to keep track of the number of relocs that it
3170 decides to copy as dynamic relocs in check_relocs for each symbol.
3171 This is so that it can later discard them if they are found to be
3172 unnecessary. We store the information in a field extending the
3173 regular ELF linker hash table. */
3174
3175 struct ppc_dyn_relocs
3176 {
3177 struct ppc_dyn_relocs *next;
3178
3179 /* The input section of the reloc. */
3180 asection *sec;
3181
3182 /* Total number of relocs copied for the input section. */
3183 bfd_size_type count;
3184
3185 /* Number of pc-relative relocs copied for the input section. */
3186 bfd_size_type pc_count;
3187 };
3188
3189 /* Track GOT entries needed for a given symbol. We might need more
3190 than one got entry per symbol. */
3191 struct got_entry
3192 {
3193 struct got_entry *next;
3194
3195 /* The symbol addend that we'll be placing in the GOT. */
3196 bfd_vma addend;
3197
3198 /* Unlike other ELF targets, we use separate GOT entries for the same
3199 symbol referenced from different input files. This is to support
3200 automatic multiple TOC/GOT sections, where the TOC base can vary
3201 from one input file to another. FIXME: After group_sections we
3202 ought to merge entries within the group.
3203
3204 Point to the BFD owning this GOT entry. */
3205 bfd *owner;
3206
3207 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD,
3208 TLS_TPREL or TLS_DTPREL for tls entries. */
3209 char tls_type;
3210
3211 /* Reference count until size_dynamic_sections, GOT offset thereafter. */
3212 union
3213 {
3214 bfd_signed_vma refcount;
3215 bfd_vma offset;
3216 } got;
3217 };
3218
3219 /* The same for PLT. */
3220 struct plt_entry
3221 {
3222 struct plt_entry *next;
3223
3224 bfd_vma addend;
3225
3226 union
3227 {
3228 bfd_signed_vma refcount;
3229 bfd_vma offset;
3230 } plt;
3231 };
3232
3233 /* Of those relocs that might be copied as dynamic relocs, this function
3234 selects those that must be copied when linking a shared library,
3235 even when the symbol is local. */
3236
3237 static int
must_be_dyn_reloc(struct bfd_link_info * info,enum elf_ppc64_reloc_type r_type)3238 must_be_dyn_reloc (struct bfd_link_info *info,
3239 enum elf_ppc64_reloc_type r_type)
3240 {
3241 switch (r_type)
3242 {
3243 default:
3244 return 1;
3245
3246 case R_PPC64_REL32:
3247 case R_PPC64_REL64:
3248 case R_PPC64_REL30:
3249 return 0;
3250
3251 case R_PPC64_TPREL16:
3252 case R_PPC64_TPREL16_LO:
3253 case R_PPC64_TPREL16_HI:
3254 case R_PPC64_TPREL16_HA:
3255 case R_PPC64_TPREL16_DS:
3256 case R_PPC64_TPREL16_LO_DS:
3257 case R_PPC64_TPREL16_HIGHER:
3258 case R_PPC64_TPREL16_HIGHERA:
3259 case R_PPC64_TPREL16_HIGHEST:
3260 case R_PPC64_TPREL16_HIGHESTA:
3261 case R_PPC64_TPREL64:
3262 return !info->executable;
3263 }
3264 }
3265
3266 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
3267 copying dynamic variables from a shared lib into an app's dynbss
3268 section, and instead use a dynamic relocation to point into the
3269 shared lib. With code that gcc generates, it's vital that this be
3270 enabled; In the PowerPC64 ABI, the address of a function is actually
3271 the address of a function descriptor, which resides in the .opd
3272 section. gcc uses the descriptor directly rather than going via the
3273 GOT as some other ABI's do, which means that initialized function
3274 pointers must reference the descriptor. Thus, a function pointer
3275 initialized to the address of a function in a shared library will
3276 either require a copy reloc, or a dynamic reloc. Using a copy reloc
3277 redefines the function descriptor symbol to point to the copy. This
3278 presents a problem as a plt entry for that function is also
3279 initialized from the function descriptor symbol and the copy reloc
3280 may not be initialized first. */
3281 #define ELIMINATE_COPY_RELOCS 1
3282
3283 /* Section name for stubs is the associated section name plus this
3284 string. */
3285 #define STUB_SUFFIX ".stub"
3286
3287 /* Linker stubs.
3288 ppc_stub_long_branch:
3289 Used when a 14 bit branch (or even a 24 bit branch) can't reach its
3290 destination, but a 24 bit branch in a stub section will reach.
3291 . b dest
3292
3293 ppc_stub_plt_branch:
3294 Similar to the above, but a 24 bit branch in the stub section won't
3295 reach its destination.
3296 . addis %r12,%r2,xxx@toc@ha
3297 . ld %r11,xxx@toc@l(%r12)
3298 . mtctr %r11
3299 . bctr
3300
3301 ppc_stub_plt_call:
3302 Used to call a function in a shared library. If it so happens that
3303 the plt entry referenced crosses a 64k boundary, then an extra
3304 "addi %r12,%r12,xxx@toc@l" will be inserted before the "mtctr".
3305 . addis %r12,%r2,xxx@toc@ha
3306 . std %r2,40(%r1)
3307 . ld %r11,xxx+0@toc@l(%r12)
3308 . mtctr %r11
3309 . ld %r2,xxx+8@toc@l(%r12)
3310 . ld %r11,xxx+16@toc@l(%r12)
3311 . bctr
3312
3313 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional
3314 code to adjust the value and save r2 to support multiple toc sections.
3315 A ppc_stub_long_branch with an r2 offset looks like:
3316 . std %r2,40(%r1)
3317 . addis %r2,%r2,off@ha
3318 . addi %r2,%r2,off@l
3319 . b dest
3320
3321 A ppc_stub_plt_branch with an r2 offset looks like:
3322 . std %r2,40(%r1)
3323 . addis %r12,%r2,xxx@toc@ha
3324 . ld %r11,xxx@toc@l(%r12)
3325 . addis %r2,%r2,off@ha
3326 . addi %r2,%r2,off@l
3327 . mtctr %r11
3328 . bctr
3329
3330 In cases where the "addis" instruction would add zero, the "addis" is
3331 omitted and following instructions modified slightly in some cases.
3332 */
3333
3334 enum ppc_stub_type {
3335 ppc_stub_none,
3336 ppc_stub_long_branch,
3337 ppc_stub_long_branch_r2off,
3338 ppc_stub_plt_branch,
3339 ppc_stub_plt_branch_r2off,
3340 ppc_stub_plt_call
3341 };
3342
3343 struct ppc_stub_hash_entry {
3344
3345 /* Base hash table entry structure. */
3346 struct bfd_hash_entry root;
3347
3348 enum ppc_stub_type stub_type;
3349
3350 /* The stub section. */
3351 asection *stub_sec;
3352
3353 /* Offset within stub_sec of the beginning of this stub. */
3354 bfd_vma stub_offset;
3355
3356 /* Given the symbol's value and its section we can determine its final
3357 value when building the stubs (so the stub knows where to jump. */
3358 bfd_vma target_value;
3359 asection *target_section;
3360
3361 /* The symbol table entry, if any, that this was derived from. */
3362 struct ppc_link_hash_entry *h;
3363
3364 /* And the reloc addend that this was derived from. */
3365 bfd_vma addend;
3366
3367 /* Where this stub is being called from, or, in the case of combined
3368 stub sections, the first input section in the group. */
3369 asection *id_sec;
3370 };
3371
3372 struct ppc_branch_hash_entry {
3373
3374 /* Base hash table entry structure. */
3375 struct bfd_hash_entry root;
3376
3377 /* Offset within branch lookup table. */
3378 unsigned int offset;
3379
3380 /* Generation marker. */
3381 unsigned int iter;
3382 };
3383
3384 struct ppc_link_hash_entry
3385 {
3386 struct elf_link_hash_entry elf;
3387
3388 union {
3389 /* A pointer to the most recently used stub hash entry against this
3390 symbol. */
3391 struct ppc_stub_hash_entry *stub_cache;
3392
3393 /* A pointer to the next symbol starting with a '.' */
3394 struct ppc_link_hash_entry *next_dot_sym;
3395 } u;
3396
3397 /* Track dynamic relocs copied for this symbol. */
3398 struct ppc_dyn_relocs *dyn_relocs;
3399
3400 /* Link between function code and descriptor symbols. */
3401 struct ppc_link_hash_entry *oh;
3402
3403 /* Flag function code and descriptor symbols. */
3404 unsigned int is_func:1;
3405 unsigned int is_func_descriptor:1;
3406 unsigned int fake:1;
3407
3408 /* Whether global opd/toc sym has been adjusted or not.
3409 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag
3410 should be set for all globals defined in any opd/toc section. */
3411 unsigned int adjust_done:1;
3412
3413 /* Set if we twiddled this symbol to weak at some stage. */
3414 unsigned int was_undefined:1;
3415
3416 /* Contexts in which symbol is used in the GOT (or TOC).
3417 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the
3418 corresponding relocs are encountered during check_relocs.
3419 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
3420 indicate the corresponding GOT entry type is not needed.
3421 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into
3422 a TPREL one. We use a separate flag rather than setting TPREL
3423 just for convenience in distinguishing the two cases. */
3424 #define TLS_GD 1 /* GD reloc. */
3425 #define TLS_LD 2 /* LD reloc. */
3426 #define TLS_TPREL 4 /* TPREL reloc, => IE. */
3427 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */
3428 #define TLS_TLS 16 /* Any TLS reloc. */
3429 #define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */
3430 #define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */
3431 char tls_mask;
3432 };
3433
3434 /* ppc64 ELF linker hash table. */
3435
3436 struct ppc_link_hash_table
3437 {
3438 struct elf_link_hash_table elf;
3439
3440 /* The stub hash table. */
3441 struct bfd_hash_table stub_hash_table;
3442
3443 /* Another hash table for plt_branch stubs. */
3444 struct bfd_hash_table branch_hash_table;
3445
3446 /* Linker stub bfd. */
3447 bfd *stub_bfd;
3448
3449 /* Linker call-backs. */
3450 asection * (*add_stub_section) (const char *, asection *);
3451 void (*layout_sections_again) (void);
3452
3453 /* Array to keep track of which stub sections have been created, and
3454 information on stub grouping. */
3455 struct map_stub {
3456 /* This is the section to which stubs in the group will be attached. */
3457 asection *link_sec;
3458 /* The stub section. */
3459 asection *stub_sec;
3460 /* Along with elf_gp, specifies the TOC pointer used in this group. */
3461 bfd_vma toc_off;
3462 } *stub_group;
3463
3464 /* Temp used when calculating TOC pointers. */
3465 bfd_vma toc_curr;
3466
3467 /* Highest input section id. */
3468 int top_id;
3469
3470 /* Highest output section index. */
3471 int top_index;
3472
3473 /* Used when adding symbols. */
3474 struct ppc_link_hash_entry *dot_syms;
3475
3476 /* List of input sections for each output section. */
3477 asection **input_list;
3478
3479 /* Short-cuts to get to dynamic linker sections. */
3480 asection *got;
3481 asection *plt;
3482 asection *relplt;
3483 asection *dynbss;
3484 asection *relbss;
3485 asection *glink;
3486 asection *sfpr;
3487 asection *brlt;
3488 asection *relbrlt;
3489
3490 /* Shortcut to .__tls_get_addr and __tls_get_addr. */
3491 struct ppc_link_hash_entry *tls_get_addr;
3492 struct ppc_link_hash_entry *tls_get_addr_fd;
3493
3494 /* Statistics. */
3495 unsigned long stub_count[ppc_stub_plt_call];
3496
3497 /* Number of stubs against global syms. */
3498 unsigned long stub_globals;
3499
3500 /* Set if we should emit symbols for stubs. */
3501 unsigned int emit_stub_syms:1;
3502
3503 /* Support for multiple toc sections. */
3504 unsigned int no_multi_toc:1;
3505 unsigned int multi_toc_needed:1;
3506
3507 /* Set on error. */
3508 unsigned int stub_error:1;
3509
3510 /* Temp used by ppc64_elf_check_directives. */
3511 unsigned int twiddled_syms:1;
3512
3513 /* Incremented every time we size stubs. */
3514 unsigned int stub_iteration;
3515
3516 /* Small local sym to section mapping cache. */
3517 struct sym_sec_cache sym_sec;
3518 };
3519
3520 /* Rename some of the generic section flags to better document how they
3521 are used here. */
3522 #define has_toc_reloc has_gp_reloc
3523 #define makes_toc_func_call need_finalize_relax
3524 #define call_check_in_progress reloc_done
3525
3526 /* Get the ppc64 ELF linker hash table from a link_info structure. */
3527
3528 #define ppc_hash_table(p) \
3529 ((struct ppc_link_hash_table *) ((p)->hash))
3530
3531 #define ppc_stub_hash_lookup(table, string, create, copy) \
3532 ((struct ppc_stub_hash_entry *) \
3533 bfd_hash_lookup ((table), (string), (create), (copy)))
3534
3535 #define ppc_branch_hash_lookup(table, string, create, copy) \
3536 ((struct ppc_branch_hash_entry *) \
3537 bfd_hash_lookup ((table), (string), (create), (copy)))
3538
3539 /* Create an entry in the stub hash table. */
3540
3541 static struct bfd_hash_entry *
stub_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3542 stub_hash_newfunc (struct bfd_hash_entry *entry,
3543 struct bfd_hash_table *table,
3544 const char *string)
3545 {
3546 /* Allocate the structure if it has not already been allocated by a
3547 subclass. */
3548 if (entry == NULL)
3549 {
3550 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry));
3551 if (entry == NULL)
3552 return entry;
3553 }
3554
3555 /* Call the allocation method of the superclass. */
3556 entry = bfd_hash_newfunc (entry, table, string);
3557 if (entry != NULL)
3558 {
3559 struct ppc_stub_hash_entry *eh;
3560
3561 /* Initialize the local fields. */
3562 eh = (struct ppc_stub_hash_entry *) entry;
3563 eh->stub_type = ppc_stub_none;
3564 eh->stub_sec = NULL;
3565 eh->stub_offset = 0;
3566 eh->target_value = 0;
3567 eh->target_section = NULL;
3568 eh->h = NULL;
3569 eh->id_sec = NULL;
3570 }
3571
3572 return entry;
3573 }
3574
3575 /* Create an entry in the branch hash table. */
3576
3577 static struct bfd_hash_entry *
branch_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3578 branch_hash_newfunc (struct bfd_hash_entry *entry,
3579 struct bfd_hash_table *table,
3580 const char *string)
3581 {
3582 /* Allocate the structure if it has not already been allocated by a
3583 subclass. */
3584 if (entry == NULL)
3585 {
3586 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry));
3587 if (entry == NULL)
3588 return entry;
3589 }
3590
3591 /* Call the allocation method of the superclass. */
3592 entry = bfd_hash_newfunc (entry, table, string);
3593 if (entry != NULL)
3594 {
3595 struct ppc_branch_hash_entry *eh;
3596
3597 /* Initialize the local fields. */
3598 eh = (struct ppc_branch_hash_entry *) entry;
3599 eh->offset = 0;
3600 eh->iter = 0;
3601 }
3602
3603 return entry;
3604 }
3605
3606 /* Create an entry in a ppc64 ELF linker hash table. */
3607
3608 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3609 link_hash_newfunc (struct bfd_hash_entry *entry,
3610 struct bfd_hash_table *table,
3611 const char *string)
3612 {
3613 /* Allocate the structure if it has not already been allocated by a
3614 subclass. */
3615 if (entry == NULL)
3616 {
3617 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry));
3618 if (entry == NULL)
3619 return entry;
3620 }
3621
3622 /* Call the allocation method of the superclass. */
3623 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
3624 if (entry != NULL)
3625 {
3626 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry;
3627
3628 memset (&eh->u.stub_cache, 0,
3629 (sizeof (struct ppc_link_hash_entry)
3630 - offsetof (struct ppc_link_hash_entry, u.stub_cache)));
3631
3632 /* When making function calls, old ABI code references function entry
3633 points (dot symbols), while new ABI code references the function
3634 descriptor symbol. We need to make any combination of reference and
3635 definition work together, without breaking archive linking.
3636
3637 For a defined function "foo" and an undefined call to "bar":
3638 An old object defines "foo" and ".foo", references ".bar" (possibly
3639 "bar" too).
3640 A new object defines "foo" and references "bar".
3641
3642 A new object thus has no problem with its undefined symbols being
3643 satisfied by definitions in an old object. On the other hand, the
3644 old object won't have ".bar" satisfied by a new object.
3645
3646 Keep a list of newly added dot-symbols. */
3647
3648 if (string[0] == '.')
3649 {
3650 struct ppc_link_hash_table *htab;
3651
3652 htab = (struct ppc_link_hash_table *) table;
3653 eh->u.next_dot_sym = htab->dot_syms;
3654 htab->dot_syms = eh;
3655 }
3656 }
3657
3658 return entry;
3659 }
3660
3661 /* Create a ppc64 ELF linker hash table. */
3662
3663 static struct bfd_link_hash_table *
ppc64_elf_link_hash_table_create(bfd * abfd)3664 ppc64_elf_link_hash_table_create (bfd *abfd)
3665 {
3666 struct ppc_link_hash_table *htab;
3667 bfd_size_type amt = sizeof (struct ppc_link_hash_table);
3668
3669 htab = bfd_zmalloc (amt);
3670 if (htab == NULL)
3671 return NULL;
3672
3673 if (!_bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc,
3674 sizeof (struct ppc_link_hash_entry)))
3675 {
3676 free (htab);
3677 return NULL;
3678 }
3679
3680 /* Init the stub hash table too. */
3681 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc,
3682 sizeof (struct ppc_stub_hash_entry)))
3683 return NULL;
3684
3685 /* And the branch hash table. */
3686 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc,
3687 sizeof (struct ppc_branch_hash_entry)))
3688 return NULL;
3689
3690 /* Initializing two fields of the union is just cosmetic. We really
3691 only care about glist, but when compiled on a 32-bit host the
3692 bfd_vma fields are larger. Setting the bfd_vma to zero makes
3693 debugger inspection of these fields look nicer. */
3694 htab->elf.init_got_refcount.refcount = 0;
3695 htab->elf.init_got_refcount.glist = NULL;
3696 htab->elf.init_plt_refcount.refcount = 0;
3697 htab->elf.init_plt_refcount.glist = NULL;
3698 htab->elf.init_got_offset.offset = 0;
3699 htab->elf.init_got_offset.glist = NULL;
3700 htab->elf.init_plt_offset.offset = 0;
3701 htab->elf.init_plt_offset.glist = NULL;
3702
3703 return &htab->elf.root;
3704 }
3705
3706 /* Free the derived linker hash table. */
3707
3708 static void
ppc64_elf_link_hash_table_free(struct bfd_link_hash_table * hash)3709 ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash)
3710 {
3711 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash;
3712
3713 bfd_hash_table_free (&ret->stub_hash_table);
3714 bfd_hash_table_free (&ret->branch_hash_table);
3715 _bfd_generic_link_hash_table_free (hash);
3716 }
3717
3718 /* Satisfy the ELF linker by filling in some fields in our fake bfd. */
3719
3720 void
ppc64_elf_init_stub_bfd(bfd * abfd,struct bfd_link_info * info)3721 ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info)
3722 {
3723 struct ppc_link_hash_table *htab;
3724
3725 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64;
3726
3727 /* Always hook our dynamic sections into the first bfd, which is the
3728 linker created stub bfd. This ensures that the GOT header is at
3729 the start of the output TOC section. */
3730 htab = ppc_hash_table (info);
3731 htab->stub_bfd = abfd;
3732 htab->elf.dynobj = abfd;
3733 }
3734
3735 /* Build a name for an entry in the stub hash table. */
3736
3737 static char *
ppc_stub_name(const asection * input_section,const asection * sym_sec,const struct ppc_link_hash_entry * h,const Elf_Internal_Rela * rel)3738 ppc_stub_name (const asection *input_section,
3739 const asection *sym_sec,
3740 const struct ppc_link_hash_entry *h,
3741 const Elf_Internal_Rela *rel)
3742 {
3743 char *stub_name;
3744 bfd_size_type len;
3745
3746 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31
3747 offsets from a sym as a branch target? In fact, we could
3748 probably assume the addend is always zero. */
3749 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend);
3750
3751 if (h)
3752 {
3753 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1;
3754 stub_name = bfd_malloc (len);
3755 if (stub_name == NULL)
3756 return stub_name;
3757
3758 sprintf (stub_name, "%08x.%s+%x",
3759 input_section->id & 0xffffffff,
3760 h->elf.root.root.string,
3761 (int) rel->r_addend & 0xffffffff);
3762 }
3763 else
3764 {
3765 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1;
3766 stub_name = bfd_malloc (len);
3767 if (stub_name == NULL)
3768 return stub_name;
3769
3770 sprintf (stub_name, "%08x.%x:%x+%x",
3771 input_section->id & 0xffffffff,
3772 sym_sec->id & 0xffffffff,
3773 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff,
3774 (int) rel->r_addend & 0xffffffff);
3775 }
3776 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0')
3777 stub_name[len - 2] = 0;
3778 return stub_name;
3779 }
3780
3781 /* Look up an entry in the stub hash. Stub entries are cached because
3782 creating the stub name takes a bit of time. */
3783
3784 static struct ppc_stub_hash_entry *
ppc_get_stub_entry(const asection * input_section,const asection * sym_sec,struct ppc_link_hash_entry * h,const Elf_Internal_Rela * rel,struct ppc_link_hash_table * htab)3785 ppc_get_stub_entry (const asection *input_section,
3786 const asection *sym_sec,
3787 struct ppc_link_hash_entry *h,
3788 const Elf_Internal_Rela *rel,
3789 struct ppc_link_hash_table *htab)
3790 {
3791 struct ppc_stub_hash_entry *stub_entry;
3792 const asection *id_sec;
3793
3794 /* If this input section is part of a group of sections sharing one
3795 stub section, then use the id of the first section in the group.
3796 Stub names need to include a section id, as there may well be
3797 more than one stub used to reach say, printf, and we need to
3798 distinguish between them. */
3799 id_sec = htab->stub_group[input_section->id].link_sec;
3800
3801 if (h != NULL && h->u.stub_cache != NULL
3802 && h->u.stub_cache->h == h
3803 && h->u.stub_cache->id_sec == id_sec)
3804 {
3805 stub_entry = h->u.stub_cache;
3806 }
3807 else
3808 {
3809 char *stub_name;
3810
3811 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel);
3812 if (stub_name == NULL)
3813 return NULL;
3814
3815 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
3816 stub_name, FALSE, FALSE);
3817 if (h != NULL)
3818 h->u.stub_cache = stub_entry;
3819
3820 free (stub_name);
3821 }
3822
3823 return stub_entry;
3824 }
3825
3826 /* Add a new stub entry to the stub hash. Not all fields of the new
3827 stub entry are initialised. */
3828
3829 static struct ppc_stub_hash_entry *
ppc_add_stub(const char * stub_name,asection * section,struct ppc_link_hash_table * htab)3830 ppc_add_stub (const char *stub_name,
3831 asection *section,
3832 struct ppc_link_hash_table *htab)
3833 {
3834 asection *link_sec;
3835 asection *stub_sec;
3836 struct ppc_stub_hash_entry *stub_entry;
3837
3838 link_sec = htab->stub_group[section->id].link_sec;
3839 stub_sec = htab->stub_group[section->id].stub_sec;
3840 if (stub_sec == NULL)
3841 {
3842 stub_sec = htab->stub_group[link_sec->id].stub_sec;
3843 if (stub_sec == NULL)
3844 {
3845 size_t namelen;
3846 bfd_size_type len;
3847 char *s_name;
3848
3849 namelen = strlen (link_sec->name);
3850 len = namelen + sizeof (STUB_SUFFIX);
3851 s_name = bfd_alloc (htab->stub_bfd, len);
3852 if (s_name == NULL)
3853 return NULL;
3854
3855 memcpy (s_name, link_sec->name, namelen);
3856 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
3857 stub_sec = (*htab->add_stub_section) (s_name, link_sec);
3858 if (stub_sec == NULL)
3859 return NULL;
3860 htab->stub_group[link_sec->id].stub_sec = stub_sec;
3861 }
3862 htab->stub_group[section->id].stub_sec = stub_sec;
3863 }
3864
3865 /* Enter this entry into the linker stub hash table. */
3866 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name,
3867 TRUE, FALSE);
3868 if (stub_entry == NULL)
3869 {
3870 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"),
3871 section->owner, stub_name);
3872 return NULL;
3873 }
3874
3875 stub_entry->stub_sec = stub_sec;
3876 stub_entry->stub_offset = 0;
3877 stub_entry->id_sec = link_sec;
3878 return stub_entry;
3879 }
3880
3881 /* Create sections for linker generated code. */
3882
3883 static bfd_boolean
create_linkage_sections(bfd * dynobj,struct bfd_link_info * info)3884 create_linkage_sections (bfd *dynobj, struct bfd_link_info *info)
3885 {
3886 struct ppc_link_hash_table *htab;
3887 flagword flags;
3888
3889 htab = ppc_hash_table (info);
3890
3891 /* Create .sfpr for code to save and restore fp regs. */
3892 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY
3893 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3894 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr",
3895 flags);
3896 if (htab->sfpr == NULL
3897 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2))
3898 return FALSE;
3899
3900 /* Create .glink for lazy dynamic linking support. */
3901 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink",
3902 flags);
3903 if (htab->glink == NULL
3904 || ! bfd_set_section_alignment (dynobj, htab->glink, 3))
3905 return FALSE;
3906
3907 /* Create branch lookup table for plt_branch stubs. */
3908 flags = (SEC_ALLOC | SEC_LOAD
3909 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3910 htab->brlt = bfd_make_section_anyway_with_flags (dynobj, ".branch_lt",
3911 flags);
3912 if (htab->brlt == NULL
3913 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3))
3914 return FALSE;
3915
3916 if (!info->shared)
3917 return TRUE;
3918
3919 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
3920 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3921 htab->relbrlt = bfd_make_section_anyway_with_flags (dynobj,
3922 ".rela.branch_lt",
3923 flags);
3924 if (!htab->relbrlt
3925 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3))
3926 return FALSE;
3927
3928 return TRUE;
3929 }
3930
3931 /* Create .got and .rela.got sections in ABFD, and .got in dynobj if
3932 not already done. */
3933
3934 static bfd_boolean
create_got_section(bfd * abfd,struct bfd_link_info * info)3935 create_got_section (bfd *abfd, struct bfd_link_info *info)
3936 {
3937 asection *got, *relgot;
3938 flagword flags;
3939 struct ppc_link_hash_table *htab = ppc_hash_table (info);
3940
3941 if (!htab->got)
3942 {
3943 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info))
3944 return FALSE;
3945
3946 htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got");
3947 if (!htab->got)
3948 abort ();
3949 }
3950
3951 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3952 | SEC_LINKER_CREATED);
3953
3954 got = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
3955 if (!got
3956 || !bfd_set_section_alignment (abfd, got, 3))
3957 return FALSE;
3958
3959 relgot = bfd_make_section_anyway_with_flags (abfd, ".rela.got",
3960 flags | SEC_READONLY);
3961 if (!relgot
3962 || ! bfd_set_section_alignment (abfd, relgot, 3))
3963 return FALSE;
3964
3965 ppc64_elf_tdata (abfd)->got = got;
3966 ppc64_elf_tdata (abfd)->relgot = relgot;
3967 return TRUE;
3968 }
3969
3970 /* Create the dynamic sections, and set up shortcuts. */
3971
3972 static bfd_boolean
ppc64_elf_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)3973 ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
3974 {
3975 struct ppc_link_hash_table *htab;
3976
3977 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
3978 return FALSE;
3979
3980 htab = ppc_hash_table (info);
3981 if (!htab->got)
3982 htab->got = bfd_get_section_by_name (dynobj, ".got");
3983 htab->plt = bfd_get_section_by_name (dynobj, ".plt");
3984 htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt");
3985 htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss");
3986 if (!info->shared)
3987 htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss");
3988
3989 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss
3990 || (!info->shared && !htab->relbss))
3991 abort ();
3992
3993 return TRUE;
3994 }
3995
3996 /* Merge PLT info on FROM with that on TO. */
3997
3998 static void
move_plt_plist(struct ppc_link_hash_entry * from,struct ppc_link_hash_entry * to)3999 move_plt_plist (struct ppc_link_hash_entry *from,
4000 struct ppc_link_hash_entry *to)
4001 {
4002 if (from->elf.plt.plist != NULL)
4003 {
4004 if (to->elf.plt.plist != NULL)
4005 {
4006 struct plt_entry **entp;
4007 struct plt_entry *ent;
4008
4009 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; )
4010 {
4011 struct plt_entry *dent;
4012
4013 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next)
4014 if (dent->addend == ent->addend)
4015 {
4016 dent->plt.refcount += ent->plt.refcount;
4017 *entp = ent->next;
4018 break;
4019 }
4020 if (dent == NULL)
4021 entp = &ent->next;
4022 }
4023 *entp = to->elf.plt.plist;
4024 }
4025
4026 to->elf.plt.plist = from->elf.plt.plist;
4027 from->elf.plt.plist = NULL;
4028 }
4029 }
4030
4031 /* Copy the extra info we tack onto an elf_link_hash_entry. */
4032
4033 static void
ppc64_elf_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)4034 ppc64_elf_copy_indirect_symbol (struct bfd_link_info *info,
4035 struct elf_link_hash_entry *dir,
4036 struct elf_link_hash_entry *ind)
4037 {
4038 struct ppc_link_hash_entry *edir, *eind;
4039
4040 edir = (struct ppc_link_hash_entry *) dir;
4041 eind = (struct ppc_link_hash_entry *) ind;
4042
4043 /* Copy over any dynamic relocs we may have on the indirect sym. */
4044 if (eind->dyn_relocs != NULL)
4045 {
4046 if (edir->dyn_relocs != NULL)
4047 {
4048 struct ppc_dyn_relocs **pp;
4049 struct ppc_dyn_relocs *p;
4050
4051 /* Add reloc counts against the indirect sym to the direct sym
4052 list. Merge any entries against the same section. */
4053 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
4054 {
4055 struct ppc_dyn_relocs *q;
4056
4057 for (q = edir->dyn_relocs; q != NULL; q = q->next)
4058 if (q->sec == p->sec)
4059 {
4060 q->pc_count += p->pc_count;
4061 q->count += p->count;
4062 *pp = p->next;
4063 break;
4064 }
4065 if (q == NULL)
4066 pp = &p->next;
4067 }
4068 *pp = edir->dyn_relocs;
4069 }
4070
4071 edir->dyn_relocs = eind->dyn_relocs;
4072 eind->dyn_relocs = NULL;
4073 }
4074
4075 edir->is_func |= eind->is_func;
4076 edir->is_func_descriptor |= eind->is_func_descriptor;
4077 edir->tls_mask |= eind->tls_mask;
4078
4079 /* If called to transfer flags for a weakdef during processing
4080 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF.
4081 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
4082 if (!(ELIMINATE_COPY_RELOCS
4083 && eind->elf.root.type != bfd_link_hash_indirect
4084 && edir->elf.dynamic_adjusted))
4085 edir->elf.non_got_ref |= eind->elf.non_got_ref;
4086
4087 edir->elf.ref_dynamic |= eind->elf.ref_dynamic;
4088 edir->elf.ref_regular |= eind->elf.ref_regular;
4089 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak;
4090 edir->elf.needs_plt |= eind->elf.needs_plt;
4091
4092 /* If we were called to copy over info for a weak sym, that's all. */
4093 if (eind->elf.root.type != bfd_link_hash_indirect)
4094 return;
4095
4096 /* Copy over got entries that we may have already seen to the
4097 symbol which just became indirect. */
4098 if (eind->elf.got.glist != NULL)
4099 {
4100 if (edir->elf.got.glist != NULL)
4101 {
4102 struct got_entry **entp;
4103 struct got_entry *ent;
4104
4105 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; )
4106 {
4107 struct got_entry *dent;
4108
4109 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next)
4110 if (dent->addend == ent->addend
4111 && dent->owner == ent->owner
4112 && dent->tls_type == ent->tls_type)
4113 {
4114 dent->got.refcount += ent->got.refcount;
4115 *entp = ent->next;
4116 break;
4117 }
4118 if (dent == NULL)
4119 entp = &ent->next;
4120 }
4121 *entp = edir->elf.got.glist;
4122 }
4123
4124 edir->elf.got.glist = eind->elf.got.glist;
4125 eind->elf.got.glist = NULL;
4126 }
4127
4128 /* And plt entries. */
4129 move_plt_plist (eind, edir);
4130
4131 if (eind->elf.dynindx != -1)
4132 {
4133 if (edir->elf.dynindx != -1)
4134 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
4135 edir->elf.dynstr_index);
4136 edir->elf.dynindx = eind->elf.dynindx;
4137 edir->elf.dynstr_index = eind->elf.dynstr_index;
4138 eind->elf.dynindx = -1;
4139 eind->elf.dynstr_index = 0;
4140 }
4141 }
4142
4143 /* Find the function descriptor hash entry from the given function code
4144 hash entry FH. Link the entries via their OH fields. */
4145
4146 static struct ppc_link_hash_entry *
get_fdh(struct ppc_link_hash_entry * fh,struct ppc_link_hash_table * htab)4147 get_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab)
4148 {
4149 struct ppc_link_hash_entry *fdh = fh->oh;
4150
4151 if (fdh == NULL)
4152 {
4153 const char *fd_name = fh->elf.root.root.string + 1;
4154
4155 fdh = (struct ppc_link_hash_entry *)
4156 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE);
4157 if (fdh != NULL)
4158 {
4159 fdh->is_func_descriptor = 1;
4160 fdh->oh = fh;
4161 fh->is_func = 1;
4162 fh->oh = fdh;
4163 }
4164 }
4165
4166 return fdh;
4167 }
4168
4169 /* Make a fake function descriptor sym for the code sym FH. */
4170
4171 static struct ppc_link_hash_entry *
make_fdh(struct bfd_link_info * info,struct ppc_link_hash_entry * fh)4172 make_fdh (struct bfd_link_info *info,
4173 struct ppc_link_hash_entry *fh)
4174 {
4175 bfd *abfd;
4176 asymbol *newsym;
4177 struct bfd_link_hash_entry *bh;
4178 struct ppc_link_hash_entry *fdh;
4179
4180 abfd = fh->elf.root.u.undef.abfd;
4181 newsym = bfd_make_empty_symbol (abfd);
4182 newsym->name = fh->elf.root.root.string + 1;
4183 newsym->section = bfd_und_section_ptr;
4184 newsym->value = 0;
4185 newsym->flags = BSF_WEAK;
4186
4187 bh = NULL;
4188 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name,
4189 newsym->flags, newsym->section,
4190 newsym->value, NULL, FALSE, FALSE,
4191 &bh))
4192 return NULL;
4193
4194 fdh = (struct ppc_link_hash_entry *) bh;
4195 fdh->elf.non_elf = 0;
4196 fdh->fake = 1;
4197 fdh->is_func_descriptor = 1;
4198 fdh->oh = fh;
4199 fh->is_func = 1;
4200 fh->oh = fdh;
4201 return fdh;
4202 }
4203
4204 /* Fix function descriptor symbols defined in .opd sections to be
4205 function type. */
4206
4207 static bfd_boolean
ppc64_elf_add_symbol_hook(bfd * ibfd ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED,Elf_Internal_Sym * isym,const char ** name ATTRIBUTE_UNUSED,flagword * flags ATTRIBUTE_UNUSED,asection ** sec,bfd_vma * value ATTRIBUTE_UNUSED)4208 ppc64_elf_add_symbol_hook (bfd *ibfd ATTRIBUTE_UNUSED,
4209 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4210 Elf_Internal_Sym *isym,
4211 const char **name ATTRIBUTE_UNUSED,
4212 flagword *flags ATTRIBUTE_UNUSED,
4213 asection **sec,
4214 bfd_vma *value ATTRIBUTE_UNUSED)
4215 {
4216 if (*sec != NULL
4217 && strcmp (bfd_get_section_name (ibfd, *sec), ".opd") == 0)
4218 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC);
4219
4220 return TRUE;
4221 }
4222
4223 /* This function makes an old ABI object reference to ".bar" cause the
4224 inclusion of a new ABI object archive that defines "bar".
4225 NAME is a symbol defined in an archive. Return a symbol in the hash
4226 table that might be satisfied by the archive symbols. */
4227
4228 static struct elf_link_hash_entry *
ppc64_elf_archive_symbol_lookup(bfd * abfd,struct bfd_link_info * info,const char * name)4229 ppc64_elf_archive_symbol_lookup (bfd *abfd,
4230 struct bfd_link_info *info,
4231 const char *name)
4232 {
4233 struct elf_link_hash_entry *h;
4234 char *dot_name;
4235 size_t len;
4236
4237 h = _bfd_elf_archive_symbol_lookup (abfd, info, name);
4238 if (h != NULL
4239 /* Don't return this sym if it is a fake function descriptor
4240 created by add_symbol_adjust. */
4241 && !(h->root.type == bfd_link_hash_undefweak
4242 && ((struct ppc_link_hash_entry *) h)->fake))
4243 return h;
4244
4245 if (name[0] == '.')
4246 return h;
4247
4248 len = strlen (name);
4249 dot_name = bfd_alloc (abfd, len + 2);
4250 if (dot_name == NULL)
4251 return (struct elf_link_hash_entry *) 0 - 1;
4252 dot_name[0] = '.';
4253 memcpy (dot_name + 1, name, len + 1);
4254 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name);
4255 bfd_release (abfd, dot_name);
4256 return h;
4257 }
4258
4259 /* This function satisfies all old ABI object references to ".bar" if a
4260 new ABI object defines "bar". Well, at least, undefined dot symbols
4261 are made weak. This stops later archive searches from including an
4262 object if we already have a function descriptor definition. It also
4263 prevents the linker complaining about undefined symbols.
4264 We also check and correct mismatched symbol visibility here. The
4265 most restrictive visibility of the function descriptor and the
4266 function entry symbol is used. */
4267
4268 static bfd_boolean
add_symbol_adjust(struct ppc_link_hash_entry * eh,struct bfd_link_info * info)4269 add_symbol_adjust (struct ppc_link_hash_entry *eh, struct bfd_link_info *info)
4270 {
4271 struct ppc_link_hash_table *htab;
4272 struct ppc_link_hash_entry *fdh;
4273
4274 if (eh->elf.root.type == bfd_link_hash_indirect)
4275 return TRUE;
4276
4277 if (eh->elf.root.type == bfd_link_hash_warning)
4278 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link;
4279
4280 if (eh->elf.root.root.string[0] != '.')
4281 abort ();
4282
4283 htab = ppc_hash_table (info);
4284 fdh = get_fdh (eh, htab);
4285 if (fdh == NULL
4286 && !info->relocatable
4287 && (eh->elf.root.type == bfd_link_hash_undefined
4288 || eh->elf.root.type == bfd_link_hash_undefweak)
4289 && eh->elf.ref_regular)
4290 {
4291 /* Make an undefweak function descriptor sym, which is enough to
4292 pull in an --as-needed shared lib, but won't cause link
4293 errors. Archives are handled elsewhere. */
4294 fdh = make_fdh (info, eh);
4295 if (fdh == NULL)
4296 return FALSE;
4297 else
4298 fdh->elf.ref_regular = 1;
4299 }
4300 else if (fdh != NULL)
4301 {
4302 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1;
4303 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1;
4304 if (entry_vis < descr_vis)
4305 fdh->elf.other += entry_vis - descr_vis;
4306 else if (entry_vis > descr_vis)
4307 eh->elf.other += descr_vis - entry_vis;
4308
4309 if ((fdh->elf.root.type == bfd_link_hash_defined
4310 || fdh->elf.root.type == bfd_link_hash_defweak)
4311 && eh->elf.root.type == bfd_link_hash_undefined)
4312 {
4313 eh->elf.root.type = bfd_link_hash_undefweak;
4314 eh->was_undefined = 1;
4315 htab->twiddled_syms = 1;
4316 }
4317 }
4318
4319 return TRUE;
4320 }
4321
4322 /* Process list of dot-symbols we made in link_hash_newfunc. */
4323
4324 static bfd_boolean
ppc64_elf_check_directives(bfd * ibfd,struct bfd_link_info * info)4325 ppc64_elf_check_directives (bfd *ibfd, struct bfd_link_info *info)
4326 {
4327 struct ppc_link_hash_table *htab;
4328 struct ppc_link_hash_entry **p, *eh;
4329
4330 htab = ppc_hash_table (info);
4331 if (!is_ppc64_elf_target (htab->elf.root.creator))
4332 return TRUE;
4333
4334 if (is_ppc64_elf_target (ibfd->xvec))
4335 {
4336 p = &htab->dot_syms;
4337 while ((eh = *p) != NULL)
4338 {
4339 *p = NULL;
4340 if (!add_symbol_adjust (eh, info))
4341 return FALSE;
4342 p = &eh->u.next_dot_sym;
4343 }
4344 }
4345
4346 /* Clear the list for non-ppc64 input files. */
4347 p = &htab->dot_syms;
4348 while ((eh = *p) != NULL)
4349 {
4350 *p = NULL;
4351 p = &eh->u.next_dot_sym;
4352 }
4353
4354 /* We need to fix the undefs list for any syms we have twiddled to
4355 undef_weak. */
4356 if (htab->twiddled_syms)
4357 {
4358 bfd_link_repair_undef_list (&htab->elf.root);
4359 htab->twiddled_syms = 0;
4360 }
4361 return TRUE;
4362 }
4363
4364 /* Undo hash table changes when an --as-needed input file is determined
4365 not to be needed. */
4366
4367 static bfd_boolean
ppc64_elf_as_needed_cleanup(bfd * ibfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)4368 ppc64_elf_as_needed_cleanup (bfd *ibfd ATTRIBUTE_UNUSED,
4369 struct bfd_link_info *info)
4370 {
4371 ppc_hash_table (info)->dot_syms = NULL;
4372 return TRUE;
4373 }
4374
4375 static bfd_boolean
update_local_sym_info(bfd * abfd,Elf_Internal_Shdr * symtab_hdr,unsigned long r_symndx,bfd_vma r_addend,int tls_type)4376 update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
4377 unsigned long r_symndx, bfd_vma r_addend, int tls_type)
4378 {
4379 struct got_entry **local_got_ents = elf_local_got_ents (abfd);
4380 char *local_got_tls_masks;
4381
4382 if (local_got_ents == NULL)
4383 {
4384 bfd_size_type size = symtab_hdr->sh_info;
4385
4386 size *= sizeof (*local_got_ents) + sizeof (*local_got_tls_masks);
4387 local_got_ents = bfd_zalloc (abfd, size);
4388 if (local_got_ents == NULL)
4389 return FALSE;
4390 elf_local_got_ents (abfd) = local_got_ents;
4391 }
4392
4393 if ((tls_type & TLS_EXPLICIT) == 0)
4394 {
4395 struct got_entry *ent;
4396
4397 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next)
4398 if (ent->addend == r_addend
4399 && ent->owner == abfd
4400 && ent->tls_type == tls_type)
4401 break;
4402 if (ent == NULL)
4403 {
4404 bfd_size_type amt = sizeof (*ent);
4405 ent = bfd_alloc (abfd, amt);
4406 if (ent == NULL)
4407 return FALSE;
4408 ent->next = local_got_ents[r_symndx];
4409 ent->addend = r_addend;
4410 ent->owner = abfd;
4411 ent->tls_type = tls_type;
4412 ent->got.refcount = 0;
4413 local_got_ents[r_symndx] = ent;
4414 }
4415 ent->got.refcount += 1;
4416 }
4417
4418 local_got_tls_masks = (char *) (local_got_ents + symtab_hdr->sh_info);
4419 local_got_tls_masks[r_symndx] |= tls_type;
4420 return TRUE;
4421 }
4422
4423 static bfd_boolean
update_plt_info(bfd * abfd,struct ppc_link_hash_entry * eh,bfd_vma addend)4424 update_plt_info (bfd *abfd, struct ppc_link_hash_entry *eh, bfd_vma addend)
4425 {
4426 struct plt_entry *ent;
4427
4428 for (ent = eh->elf.plt.plist; ent != NULL; ent = ent->next)
4429 if (ent->addend == addend)
4430 break;
4431 if (ent == NULL)
4432 {
4433 bfd_size_type amt = sizeof (*ent);
4434 ent = bfd_alloc (abfd, amt);
4435 if (ent == NULL)
4436 return FALSE;
4437 ent->next = eh->elf.plt.plist;
4438 ent->addend = addend;
4439 ent->plt.refcount = 0;
4440 eh->elf.plt.plist = ent;
4441 }
4442 ent->plt.refcount += 1;
4443 eh->elf.needs_plt = 1;
4444 if (eh->elf.root.root.string[0] == '.'
4445 && eh->elf.root.root.string[1] != '\0')
4446 eh->is_func = 1;
4447 return TRUE;
4448 }
4449
4450 /* Look through the relocs for a section during the first phase, and
4451 calculate needed space in the global offset table, procedure
4452 linkage table, and dynamic reloc sections. */
4453
4454 static bfd_boolean
ppc64_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)4455 ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
4456 asection *sec, const Elf_Internal_Rela *relocs)
4457 {
4458 struct ppc_link_hash_table *htab;
4459 Elf_Internal_Shdr *symtab_hdr;
4460 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
4461 const Elf_Internal_Rela *rel;
4462 const Elf_Internal_Rela *rel_end;
4463 asection *sreloc;
4464 asection **opd_sym_map;
4465 struct elf_link_hash_entry *tga, *dottga;
4466
4467 if (info->relocatable)
4468 return TRUE;
4469
4470 /* Don't do anything special with non-loaded, non-alloced sections.
4471 In particular, any relocs in such sections should not affect GOT
4472 and PLT reference counting (ie. we don't allow them to create GOT
4473 or PLT entries), there's no possibility or desire to optimize TLS
4474 relocs, and there's not much point in propagating relocs to shared
4475 libs that the dynamic linker won't relocate. */
4476 if ((sec->flags & SEC_ALLOC) == 0)
4477 return TRUE;
4478
4479 htab = ppc_hash_table (info);
4480 tga = elf_link_hash_lookup (&htab->elf, "__tls_get_addr",
4481 FALSE, FALSE, TRUE);
4482 dottga = elf_link_hash_lookup (&htab->elf, ".__tls_get_addr",
4483 FALSE, FALSE, TRUE);
4484 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4485
4486 sym_hashes = elf_sym_hashes (abfd);
4487 sym_hashes_end = (sym_hashes
4488 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym)
4489 - symtab_hdr->sh_info);
4490
4491 sreloc = NULL;
4492 opd_sym_map = NULL;
4493 if (strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0)
4494 {
4495 /* Garbage collection needs some extra help with .opd sections.
4496 We don't want to necessarily keep everything referenced by
4497 relocs in .opd, as that would keep all functions. Instead,
4498 if we reference an .opd symbol (a function descriptor), we
4499 want to keep the function code symbol's section. This is
4500 easy for global symbols, but for local syms we need to keep
4501 information about the associated function section. Later, if
4502 edit_opd deletes entries, we'll use this array to adjust
4503 local syms in .opd. */
4504 union opd_info {
4505 asection *func_section;
4506 long entry_adjust;
4507 };
4508 bfd_size_type amt;
4509
4510 amt = sec->size * sizeof (union opd_info) / 8;
4511 opd_sym_map = bfd_zalloc (abfd, amt);
4512 if (opd_sym_map == NULL)
4513 return FALSE;
4514 ppc64_elf_section_data (sec)->u.opd_func_sec = opd_sym_map;
4515 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal);
4516 ppc64_elf_section_data (sec)->sec_type = sec_opd;
4517 }
4518
4519 if (htab->sfpr == NULL
4520 && !create_linkage_sections (htab->elf.dynobj, info))
4521 return FALSE;
4522
4523 rel_end = relocs + sec->reloc_count;
4524 for (rel = relocs; rel < rel_end; rel++)
4525 {
4526 unsigned long r_symndx;
4527 struct elf_link_hash_entry *h;
4528 enum elf_ppc64_reloc_type r_type;
4529 int tls_type;
4530 struct _ppc64_elf_section_data *ppc64_sec;
4531
4532 r_symndx = ELF64_R_SYM (rel->r_info);
4533 if (r_symndx < symtab_hdr->sh_info)
4534 h = NULL;
4535 else
4536 {
4537 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4538 while (h->root.type == bfd_link_hash_indirect
4539 || h->root.type == bfd_link_hash_warning)
4540 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4541 }
4542
4543 tls_type = 0;
4544 r_type = ELF64_R_TYPE (rel->r_info);
4545 if (h != NULL && (h == tga || h == dottga))
4546 switch (r_type)
4547 {
4548 default:
4549 break;
4550
4551 case R_PPC64_REL24:
4552 case R_PPC64_REL14:
4553 case R_PPC64_REL14_BRTAKEN:
4554 case R_PPC64_REL14_BRNTAKEN:
4555 case R_PPC64_ADDR24:
4556 case R_PPC64_ADDR14:
4557 case R_PPC64_ADDR14_BRTAKEN:
4558 case R_PPC64_ADDR14_BRNTAKEN:
4559 if (rel != relocs
4560 && (ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_TLSGD
4561 || ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_TLSLD))
4562 /* We have a new-style __tls_get_addr call with a marker
4563 reloc. */
4564 ;
4565 else
4566 /* Mark this section as having an old-style call. */
4567 sec->has_tls_get_addr_call = 1;
4568 break;
4569 }
4570
4571 switch (r_type)
4572 {
4573 case R_PPC64_TLSGD:
4574 case R_PPC64_TLSLD:
4575 /* These special tls relocs tie a call to __tls_get_addr with
4576 its parameter symbol. */
4577 break;
4578
4579 case R_PPC64_GOT_TLSLD16:
4580 case R_PPC64_GOT_TLSLD16_LO:
4581 case R_PPC64_GOT_TLSLD16_HI:
4582 case R_PPC64_GOT_TLSLD16_HA:
4583 tls_type = TLS_TLS | TLS_LD;
4584 goto dogottls;
4585
4586 case R_PPC64_GOT_TLSGD16:
4587 case R_PPC64_GOT_TLSGD16_LO:
4588 case R_PPC64_GOT_TLSGD16_HI:
4589 case R_PPC64_GOT_TLSGD16_HA:
4590 tls_type = TLS_TLS | TLS_GD;
4591 goto dogottls;
4592
4593 case R_PPC64_GOT_TPREL16_DS:
4594 case R_PPC64_GOT_TPREL16_LO_DS:
4595 case R_PPC64_GOT_TPREL16_HI:
4596 case R_PPC64_GOT_TPREL16_HA:
4597 if (!info->executable)
4598 info->flags |= DF_STATIC_TLS;
4599 tls_type = TLS_TLS | TLS_TPREL;
4600 goto dogottls;
4601
4602 case R_PPC64_GOT_DTPREL16_DS:
4603 case R_PPC64_GOT_DTPREL16_LO_DS:
4604 case R_PPC64_GOT_DTPREL16_HI:
4605 case R_PPC64_GOT_DTPREL16_HA:
4606 tls_type = TLS_TLS | TLS_DTPREL;
4607 dogottls:
4608 sec->has_tls_reloc = 1;
4609 /* Fall thru */
4610
4611 case R_PPC64_GOT16:
4612 case R_PPC64_GOT16_DS:
4613 case R_PPC64_GOT16_HA:
4614 case R_PPC64_GOT16_HI:
4615 case R_PPC64_GOT16_LO:
4616 case R_PPC64_GOT16_LO_DS:
4617 /* This symbol requires a global offset table entry. */
4618 sec->has_toc_reloc = 1;
4619 if (ppc64_elf_tdata (abfd)->got == NULL
4620 && !create_got_section (abfd, info))
4621 return FALSE;
4622
4623 if (h != NULL)
4624 {
4625 struct ppc_link_hash_entry *eh;
4626 struct got_entry *ent;
4627
4628 eh = (struct ppc_link_hash_entry *) h;
4629 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next)
4630 if (ent->addend == rel->r_addend
4631 && ent->owner == abfd
4632 && ent->tls_type == tls_type)
4633 break;
4634 if (ent == NULL)
4635 {
4636 bfd_size_type amt = sizeof (*ent);
4637 ent = bfd_alloc (abfd, amt);
4638 if (ent == NULL)
4639 return FALSE;
4640 ent->next = eh->elf.got.glist;
4641 ent->addend = rel->r_addend;
4642 ent->owner = abfd;
4643 ent->tls_type = tls_type;
4644 ent->got.refcount = 0;
4645 eh->elf.got.glist = ent;
4646 }
4647 ent->got.refcount += 1;
4648 eh->tls_mask |= tls_type;
4649 }
4650 else
4651 /* This is a global offset table entry for a local symbol. */
4652 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx,
4653 rel->r_addend, tls_type))
4654 return FALSE;
4655 break;
4656
4657 case R_PPC64_PLT16_HA:
4658 case R_PPC64_PLT16_HI:
4659 case R_PPC64_PLT16_LO:
4660 case R_PPC64_PLT32:
4661 case R_PPC64_PLT64:
4662 /* This symbol requires a procedure linkage table entry. We
4663 actually build the entry in adjust_dynamic_symbol,
4664 because this might be a case of linking PIC code without
4665 linking in any dynamic objects, in which case we don't
4666 need to generate a procedure linkage table after all. */
4667 if (h == NULL)
4668 {
4669 /* It does not make sense to have a procedure linkage
4670 table entry for a local symbol. */
4671 bfd_set_error (bfd_error_bad_value);
4672 return FALSE;
4673 }
4674 else
4675 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h,
4676 rel->r_addend))
4677 return FALSE;
4678 break;
4679
4680 /* The following relocations don't need to propagate the
4681 relocation if linking a shared object since they are
4682 section relative. */
4683 case R_PPC64_SECTOFF:
4684 case R_PPC64_SECTOFF_LO:
4685 case R_PPC64_SECTOFF_HI:
4686 case R_PPC64_SECTOFF_HA:
4687 case R_PPC64_SECTOFF_DS:
4688 case R_PPC64_SECTOFF_LO_DS:
4689 case R_PPC64_DTPREL16:
4690 case R_PPC64_DTPREL16_LO:
4691 case R_PPC64_DTPREL16_HI:
4692 case R_PPC64_DTPREL16_HA:
4693 case R_PPC64_DTPREL16_DS:
4694 case R_PPC64_DTPREL16_LO_DS:
4695 case R_PPC64_DTPREL16_HIGHER:
4696 case R_PPC64_DTPREL16_HIGHERA:
4697 case R_PPC64_DTPREL16_HIGHEST:
4698 case R_PPC64_DTPREL16_HIGHESTA:
4699 break;
4700
4701 /* Nor do these. */
4702 case R_PPC64_TOC16:
4703 case R_PPC64_TOC16_LO:
4704 case R_PPC64_TOC16_HI:
4705 case R_PPC64_TOC16_HA:
4706 case R_PPC64_TOC16_DS:
4707 case R_PPC64_TOC16_LO_DS:
4708 sec->has_toc_reloc = 1;
4709 break;
4710
4711 /* This relocation describes the C++ object vtable hierarchy.
4712 Reconstruct it for later use during GC. */
4713 case R_PPC64_GNU_VTINHERIT:
4714 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4715 return FALSE;
4716 break;
4717
4718 /* This relocation describes which C++ vtable entries are actually
4719 used. Record for later use during GC. */
4720 case R_PPC64_GNU_VTENTRY:
4721 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4722 return FALSE;
4723 break;
4724
4725 case R_PPC64_REL14:
4726 case R_PPC64_REL14_BRTAKEN:
4727 case R_PPC64_REL14_BRNTAKEN:
4728 {
4729 asection *dest = NULL;
4730
4731 /* Heuristic: If jumping outside our section, chances are
4732 we are going to need a stub. */
4733 if (h != NULL)
4734 {
4735 /* If the sym is weak it may be overridden later, so
4736 don't assume we know where a weak sym lives. */
4737 if (h->root.type == bfd_link_hash_defined)
4738 dest = h->root.u.def.section;
4739 }
4740 else
4741 dest = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4742 sec, r_symndx);
4743 if (dest != sec)
4744 ppc64_elf_section_data (sec)->has_14bit_branch = 1;
4745 }
4746 /* Fall through. */
4747
4748 case R_PPC64_REL24:
4749 if (h != NULL)
4750 {
4751 /* We may need a .plt entry if the function this reloc
4752 refers to is in a shared lib. */
4753 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h,
4754 rel->r_addend))
4755 return FALSE;
4756 if (h == tga || h == dottga)
4757 sec->has_tls_reloc = 1;
4758 }
4759 break;
4760
4761 case R_PPC64_TPREL64:
4762 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL;
4763 if (!info->executable)
4764 info->flags |= DF_STATIC_TLS;
4765 goto dotlstoc;
4766
4767 case R_PPC64_DTPMOD64:
4768 if (rel + 1 < rel_end
4769 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)
4770 && rel[1].r_offset == rel->r_offset + 8)
4771 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD;
4772 else
4773 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD;
4774 goto dotlstoc;
4775
4776 case R_PPC64_DTPREL64:
4777 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL;
4778 if (rel != relocs
4779 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64)
4780 && rel[-1].r_offset == rel->r_offset - 8)
4781 /* This is the second reloc of a dtpmod, dtprel pair.
4782 Don't mark with TLS_DTPREL. */
4783 goto dodyn;
4784
4785 dotlstoc:
4786 sec->has_tls_reloc = 1;
4787 if (h != NULL)
4788 {
4789 struct ppc_link_hash_entry *eh;
4790 eh = (struct ppc_link_hash_entry *) h;
4791 eh->tls_mask |= tls_type;
4792 }
4793 else
4794 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx,
4795 rel->r_addend, tls_type))
4796 return FALSE;
4797
4798 ppc64_sec = ppc64_elf_section_data (sec);
4799 if (ppc64_sec->sec_type != sec_toc)
4800 {
4801 bfd_size_type amt;
4802
4803 /* One extra to simplify get_tls_mask. */
4804 amt = sec->size * sizeof (unsigned) / 8 + sizeof (unsigned);
4805 ppc64_sec->u.toc.symndx = bfd_zalloc (abfd, amt);
4806 if (ppc64_sec->u.toc.symndx == NULL)
4807 return FALSE;
4808 amt = sec->size * sizeof (bfd_vma) / 8;
4809 ppc64_sec->u.toc.add = bfd_zalloc (abfd, amt);
4810 if (ppc64_sec->u.toc.add == NULL)
4811 return FALSE;
4812 BFD_ASSERT (ppc64_sec->sec_type == sec_normal);
4813 ppc64_sec->sec_type = sec_toc;
4814 }
4815 BFD_ASSERT (rel->r_offset % 8 == 0);
4816 ppc64_sec->u.toc.symndx[rel->r_offset / 8] = r_symndx;
4817 ppc64_sec->u.toc.add[rel->r_offset / 8] = rel->r_addend;
4818
4819 /* Mark the second slot of a GD or LD entry.
4820 -1 to indicate GD and -2 to indicate LD. */
4821 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD))
4822 ppc64_sec->u.toc.symndx[rel->r_offset / 8 + 1] = -1;
4823 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD))
4824 ppc64_sec->u.toc.symndx[rel->r_offset / 8 + 1] = -2;
4825 goto dodyn;
4826
4827 case R_PPC64_TPREL16:
4828 case R_PPC64_TPREL16_LO:
4829 case R_PPC64_TPREL16_HI:
4830 case R_PPC64_TPREL16_HA:
4831 case R_PPC64_TPREL16_DS:
4832 case R_PPC64_TPREL16_LO_DS:
4833 case R_PPC64_TPREL16_HIGHER:
4834 case R_PPC64_TPREL16_HIGHERA:
4835 case R_PPC64_TPREL16_HIGHEST:
4836 case R_PPC64_TPREL16_HIGHESTA:
4837 if (info->shared)
4838 {
4839 if (!info->executable)
4840 info->flags |= DF_STATIC_TLS;
4841 goto dodyn;
4842 }
4843 break;
4844
4845 case R_PPC64_ADDR64:
4846 if (opd_sym_map != NULL
4847 && rel + 1 < rel_end
4848 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC)
4849 {
4850 if (h != NULL)
4851 {
4852 if (h->root.root.string[0] == '.'
4853 && h->root.root.string[1] != 0
4854 && get_fdh ((struct ppc_link_hash_entry *) h, htab))
4855 ;
4856 else
4857 ((struct ppc_link_hash_entry *) h)->is_func = 1;
4858 }
4859 else
4860 {
4861 asection *s;
4862
4863 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec,
4864 r_symndx);
4865 if (s == NULL)
4866 return FALSE;
4867 else if (s != sec)
4868 opd_sym_map[rel->r_offset / 8] = s;
4869 }
4870 }
4871 /* Fall through. */
4872
4873 case R_PPC64_REL30:
4874 case R_PPC64_REL32:
4875 case R_PPC64_REL64:
4876 case R_PPC64_ADDR14:
4877 case R_PPC64_ADDR14_BRNTAKEN:
4878 case R_PPC64_ADDR14_BRTAKEN:
4879 case R_PPC64_ADDR16:
4880 case R_PPC64_ADDR16_DS:
4881 case R_PPC64_ADDR16_HA:
4882 case R_PPC64_ADDR16_HI:
4883 case R_PPC64_ADDR16_HIGHER:
4884 case R_PPC64_ADDR16_HIGHERA:
4885 case R_PPC64_ADDR16_HIGHEST:
4886 case R_PPC64_ADDR16_HIGHESTA:
4887 case R_PPC64_ADDR16_LO:
4888 case R_PPC64_ADDR16_LO_DS:
4889 case R_PPC64_ADDR24:
4890 case R_PPC64_ADDR32:
4891 case R_PPC64_UADDR16:
4892 case R_PPC64_UADDR32:
4893 case R_PPC64_UADDR64:
4894 case R_PPC64_TOC:
4895 if (h != NULL && !info->shared)
4896 /* We may need a copy reloc. */
4897 h->non_got_ref = 1;
4898
4899 /* Don't propagate .opd relocs. */
4900 if (NO_OPD_RELOCS && opd_sym_map != NULL)
4901 break;
4902
4903 /* If we are creating a shared library, and this is a reloc
4904 against a global symbol, or a non PC relative reloc
4905 against a local symbol, then we need to copy the reloc
4906 into the shared library. However, if we are linking with
4907 -Bsymbolic, we do not need to copy a reloc against a
4908 global symbol which is defined in an object we are
4909 including in the link (i.e., DEF_REGULAR is set). At
4910 this point we have not seen all the input files, so it is
4911 possible that DEF_REGULAR is not set now but will be set
4912 later (it is never cleared). In case of a weak definition,
4913 DEF_REGULAR may be cleared later by a strong definition in
4914 a shared library. We account for that possibility below by
4915 storing information in the dyn_relocs field of the hash
4916 table entry. A similar situation occurs when creating
4917 shared libraries and symbol visibility changes render the
4918 symbol local.
4919
4920 If on the other hand, we are creating an executable, we
4921 may need to keep relocations for symbols satisfied by a
4922 dynamic library if we manage to avoid copy relocs for the
4923 symbol. */
4924 dodyn:
4925 if ((info->shared
4926 && (must_be_dyn_reloc (info, r_type)
4927 || (h != NULL
4928 && (! info->symbolic
4929 || h->root.type == bfd_link_hash_defweak
4930 || !h->def_regular))))
4931 || (ELIMINATE_COPY_RELOCS
4932 && !info->shared
4933 && h != NULL
4934 && (h->root.type == bfd_link_hash_defweak
4935 || !h->def_regular)))
4936 {
4937 struct ppc_dyn_relocs *p;
4938 struct ppc_dyn_relocs **head;
4939
4940 /* We must copy these reloc types into the output file.
4941 Create a reloc section in dynobj and make room for
4942 this reloc. */
4943 if (sreloc == NULL)
4944 {
4945 const char *name;
4946 bfd *dynobj;
4947
4948 name = (bfd_elf_string_from_elf_section
4949 (abfd,
4950 elf_elfheader (abfd)->e_shstrndx,
4951 elf_section_data (sec)->rel_hdr.sh_name));
4952 if (name == NULL)
4953 return FALSE;
4954
4955 if (! CONST_STRNEQ (name, ".rela")
4956 || strcmp (bfd_get_section_name (abfd, sec),
4957 name + 5) != 0)
4958 {
4959 (*_bfd_error_handler)
4960 (_("%B: bad relocation section name `%s\'"),
4961 abfd, name);
4962 bfd_set_error (bfd_error_bad_value);
4963 }
4964
4965 dynobj = htab->elf.dynobj;
4966 sreloc = bfd_get_section_by_name (dynobj, name);
4967 if (sreloc == NULL)
4968 {
4969 flagword flags;
4970
4971 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4972 | SEC_IN_MEMORY | SEC_LINKER_CREATED
4973 | SEC_ALLOC | SEC_LOAD);
4974 sreloc = bfd_make_section_with_flags (dynobj,
4975 name,
4976 flags);
4977 if (sreloc == NULL
4978 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
4979 return FALSE;
4980 }
4981 elf_section_data (sec)->sreloc = sreloc;
4982 }
4983
4984 /* If this is a global symbol, we count the number of
4985 relocations we need for this symbol. */
4986 if (h != NULL)
4987 {
4988 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs;
4989 }
4990 else
4991 {
4992 /* Track dynamic relocs needed for local syms too.
4993 We really need local syms available to do this
4994 easily. Oh well. */
4995
4996 asection *s;
4997 void *vpp;
4998
4999 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
5000 sec, r_symndx);
5001 if (s == NULL)
5002 return FALSE;
5003
5004 vpp = &elf_section_data (s)->local_dynrel;
5005 head = (struct ppc_dyn_relocs **) vpp;
5006 }
5007
5008 p = *head;
5009 if (p == NULL || p->sec != sec)
5010 {
5011 p = bfd_alloc (htab->elf.dynobj, sizeof *p);
5012 if (p == NULL)
5013 return FALSE;
5014 p->next = *head;
5015 *head = p;
5016 p->sec = sec;
5017 p->count = 0;
5018 p->pc_count = 0;
5019 }
5020
5021 p->count += 1;
5022 if (!must_be_dyn_reloc (info, r_type))
5023 p->pc_count += 1;
5024 }
5025 break;
5026
5027 default:
5028 break;
5029 }
5030 }
5031
5032 return TRUE;
5033 }
5034
5035 /* OFFSET in OPD_SEC specifies a function descriptor. Return the address
5036 of the code entry point, and its section. */
5037
5038 static bfd_vma
opd_entry_value(asection * opd_sec,bfd_vma offset,asection ** code_sec,bfd_vma * code_off)5039 opd_entry_value (asection *opd_sec,
5040 bfd_vma offset,
5041 asection **code_sec,
5042 bfd_vma *code_off)
5043 {
5044 bfd *opd_bfd = opd_sec->owner;
5045 Elf_Internal_Rela *relocs;
5046 Elf_Internal_Rela *lo, *hi, *look;
5047 bfd_vma val;
5048
5049 /* No relocs implies we are linking a --just-symbols object. */
5050 if (opd_sec->reloc_count == 0)
5051 {
5052 bfd_vma val;
5053
5054 if (!bfd_get_section_contents (opd_bfd, opd_sec, &val, offset, 8))
5055 return (bfd_vma) -1;
5056
5057 if (code_sec != NULL)
5058 {
5059 asection *sec, *likely = NULL;
5060 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next)
5061 if (sec->vma <= val
5062 && (sec->flags & SEC_LOAD) != 0
5063 && (sec->flags & SEC_ALLOC) != 0)
5064 likely = sec;
5065 if (likely != NULL)
5066 {
5067 *code_sec = likely;
5068 if (code_off != NULL)
5069 *code_off = val - likely->vma;
5070 }
5071 }
5072 return val;
5073 }
5074
5075 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs;
5076 if (relocs == NULL)
5077 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE);
5078
5079 /* Go find the opd reloc at the sym address. */
5080 lo = relocs;
5081 BFD_ASSERT (lo != NULL);
5082 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */
5083 val = (bfd_vma) -1;
5084 while (lo < hi)
5085 {
5086 look = lo + (hi - lo) / 2;
5087 if (look->r_offset < offset)
5088 lo = look + 1;
5089 else if (look->r_offset > offset)
5090 hi = look;
5091 else
5092 {
5093 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (opd_bfd)->symtab_hdr;
5094 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64
5095 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC)
5096 {
5097 unsigned long symndx = ELF64_R_SYM (look->r_info);
5098 asection *sec;
5099
5100 if (symndx < symtab_hdr->sh_info)
5101 {
5102 Elf_Internal_Sym *sym;
5103
5104 sym = (Elf_Internal_Sym *) symtab_hdr->contents;
5105 if (sym == NULL)
5106 {
5107 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr,
5108 symtab_hdr->sh_info,
5109 0, NULL, NULL, NULL);
5110 if (sym == NULL)
5111 break;
5112 symtab_hdr->contents = (bfd_byte *) sym;
5113 }
5114
5115 sym += symndx;
5116 val = sym->st_value;
5117 sec = NULL;
5118 if ((sym->st_shndx != SHN_UNDEF
5119 && sym->st_shndx < SHN_LORESERVE)
5120 || sym->st_shndx > SHN_HIRESERVE)
5121 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx);
5122 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0);
5123 }
5124 else
5125 {
5126 struct elf_link_hash_entry **sym_hashes;
5127 struct elf_link_hash_entry *rh;
5128
5129 sym_hashes = elf_sym_hashes (opd_bfd);
5130 rh = sym_hashes[symndx - symtab_hdr->sh_info];
5131 while (rh->root.type == bfd_link_hash_indirect
5132 || rh->root.type == bfd_link_hash_warning)
5133 rh = ((struct elf_link_hash_entry *) rh->root.u.i.link);
5134 BFD_ASSERT (rh->root.type == bfd_link_hash_defined
5135 || rh->root.type == bfd_link_hash_defweak);
5136 val = rh->root.u.def.value;
5137 sec = rh->root.u.def.section;
5138 }
5139 val += look->r_addend;
5140 if (code_off != NULL)
5141 *code_off = val;
5142 if (code_sec != NULL)
5143 *code_sec = sec;
5144 if (sec != NULL && sec->output_section != NULL)
5145 val += sec->output_section->vma + sec->output_offset;
5146 }
5147 break;
5148 }
5149 }
5150
5151 return val;
5152 }
5153
5154 /* Mark sections containing dynamically referenced symbols. When
5155 building shared libraries, we must assume that any visible symbol is
5156 referenced. */
5157
5158 static bfd_boolean
ppc64_elf_gc_mark_dynamic_ref(struct elf_link_hash_entry * h,void * inf)5159 ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf)
5160 {
5161 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5162 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h;
5163
5164 if (eh->elf.root.type == bfd_link_hash_warning)
5165 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link;
5166
5167 /* Dynamic linking info is on the func descriptor sym. */
5168 if (eh->oh != NULL
5169 && eh->oh->is_func_descriptor
5170 && (eh->oh->elf.root.type == bfd_link_hash_defined
5171 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5172 eh = eh->oh;
5173
5174 if ((eh->elf.root.type == bfd_link_hash_defined
5175 || eh->elf.root.type == bfd_link_hash_defweak)
5176 && (eh->elf.ref_dynamic
5177 || (!info->executable
5178 && eh->elf.def_regular
5179 && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL
5180 && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN)))
5181 {
5182 asection *code_sec;
5183
5184 eh->elf.root.u.def.section->flags |= SEC_KEEP;
5185
5186 /* Function descriptor syms cause the associated
5187 function code sym section to be marked. */
5188 if (eh->is_func_descriptor
5189 && (eh->oh->elf.root.type == bfd_link_hash_defined
5190 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5191 eh->oh->elf.root.u.def.section->flags |= SEC_KEEP;
5192 else if (get_opd_info (eh->elf.root.u.def.section) != NULL
5193 && opd_entry_value (eh->elf.root.u.def.section,
5194 eh->elf.root.u.def.value,
5195 &code_sec, NULL) != (bfd_vma) -1)
5196 code_sec->flags |= SEC_KEEP;
5197 }
5198
5199 return TRUE;
5200 }
5201
5202 /* Return the section that should be marked against GC for a given
5203 relocation. */
5204
5205 static asection *
ppc64_elf_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)5206 ppc64_elf_gc_mark_hook (asection *sec,
5207 struct bfd_link_info *info,
5208 Elf_Internal_Rela *rel,
5209 struct elf_link_hash_entry *h,
5210 Elf_Internal_Sym *sym)
5211 {
5212 asection *rsec;
5213
5214 /* First mark all our entry sym sections. */
5215 if (info->gc_sym_list != NULL)
5216 {
5217 struct ppc_link_hash_table *htab = ppc_hash_table (info);
5218 struct bfd_sym_chain *sym = info->gc_sym_list;
5219
5220 info->gc_sym_list = NULL;
5221 for (; sym != NULL; sym = sym->next)
5222 {
5223 struct ppc_link_hash_entry *eh;
5224
5225 eh = (struct ppc_link_hash_entry *)
5226 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, FALSE);
5227 if (eh == NULL)
5228 continue;
5229 if (eh->elf.root.type != bfd_link_hash_defined
5230 && eh->elf.root.type != bfd_link_hash_defweak)
5231 continue;
5232
5233 if (eh->is_func_descriptor
5234 && (eh->oh->elf.root.type == bfd_link_hash_defined
5235 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5236 rsec = eh->oh->elf.root.u.def.section;
5237 else if (get_opd_info (eh->elf.root.u.def.section) != NULL
5238 && opd_entry_value (eh->elf.root.u.def.section,
5239 eh->elf.root.u.def.value,
5240 &rsec, NULL) != (bfd_vma) -1)
5241 ;
5242 else
5243 continue;
5244
5245 if (!rsec->gc_mark)
5246 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
5247
5248 rsec = eh->elf.root.u.def.section;
5249 if (!rsec->gc_mark)
5250 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
5251 }
5252 }
5253
5254 /* Syms return NULL if we're marking .opd, so we avoid marking all
5255 function sections, as all functions are referenced in .opd. */
5256 rsec = NULL;
5257 if (get_opd_info (sec) != NULL)
5258 return rsec;
5259
5260 if (h != NULL)
5261 {
5262 enum elf_ppc64_reloc_type r_type;
5263 struct ppc_link_hash_entry *eh;
5264
5265 r_type = ELF64_R_TYPE (rel->r_info);
5266 switch (r_type)
5267 {
5268 case R_PPC64_GNU_VTINHERIT:
5269 case R_PPC64_GNU_VTENTRY:
5270 break;
5271
5272 default:
5273 switch (h->root.type)
5274 {
5275 case bfd_link_hash_defined:
5276 case bfd_link_hash_defweak:
5277 eh = (struct ppc_link_hash_entry *) h;
5278 if (eh->oh != NULL
5279 && eh->oh->is_func_descriptor
5280 && (eh->oh->elf.root.type == bfd_link_hash_defined
5281 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5282 eh = eh->oh;
5283
5284 /* Function descriptor syms cause the associated
5285 function code sym section to be marked. */
5286 if (eh->is_func_descriptor
5287 && (eh->oh->elf.root.type == bfd_link_hash_defined
5288 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5289 {
5290 /* They also mark their opd section. */
5291 if (!eh->elf.root.u.def.section->gc_mark)
5292 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section,
5293 ppc64_elf_gc_mark_hook);
5294
5295 rsec = eh->oh->elf.root.u.def.section;
5296 }
5297 else if (get_opd_info (eh->elf.root.u.def.section) != NULL
5298 && opd_entry_value (eh->elf.root.u.def.section,
5299 eh->elf.root.u.def.value,
5300 &rsec, NULL) != (bfd_vma) -1)
5301 {
5302 if (!eh->elf.root.u.def.section->gc_mark)
5303 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section,
5304 ppc64_elf_gc_mark_hook);
5305 }
5306 else
5307 rsec = h->root.u.def.section;
5308 break;
5309
5310 case bfd_link_hash_common:
5311 rsec = h->root.u.c.p->section;
5312 break;
5313
5314 default:
5315 break;
5316 }
5317 }
5318 }
5319 else
5320 {
5321 asection **opd_sym_section;
5322
5323 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx);
5324 opd_sym_section = get_opd_info (rsec);
5325 if (opd_sym_section != NULL)
5326 {
5327 if (!rsec->gc_mark)
5328 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
5329
5330 rsec = opd_sym_section[(sym->st_value + rel->r_addend) / 8];
5331 }
5332 }
5333
5334 return rsec;
5335 }
5336
5337 /* Update the .got, .plt. and dynamic reloc reference counts for the
5338 section being removed. */
5339
5340 static bfd_boolean
ppc64_elf_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)5341 ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
5342 asection *sec, const Elf_Internal_Rela *relocs)
5343 {
5344 struct ppc_link_hash_table *htab;
5345 Elf_Internal_Shdr *symtab_hdr;
5346 struct elf_link_hash_entry **sym_hashes;
5347 struct got_entry **local_got_ents;
5348 const Elf_Internal_Rela *rel, *relend;
5349
5350 if ((sec->flags & SEC_ALLOC) == 0)
5351 return TRUE;
5352
5353 elf_section_data (sec)->local_dynrel = NULL;
5354
5355 htab = ppc_hash_table (info);
5356 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5357 sym_hashes = elf_sym_hashes (abfd);
5358 local_got_ents = elf_local_got_ents (abfd);
5359
5360 relend = relocs + sec->reloc_count;
5361 for (rel = relocs; rel < relend; rel++)
5362 {
5363 unsigned long r_symndx;
5364 enum elf_ppc64_reloc_type r_type;
5365 struct elf_link_hash_entry *h = NULL;
5366 char tls_type = 0;
5367
5368 r_symndx = ELF64_R_SYM (rel->r_info);
5369 r_type = ELF64_R_TYPE (rel->r_info);
5370 if (r_symndx >= symtab_hdr->sh_info)
5371 {
5372 struct ppc_link_hash_entry *eh;
5373 struct ppc_dyn_relocs **pp;
5374 struct ppc_dyn_relocs *p;
5375
5376 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
5377 while (h->root.type == bfd_link_hash_indirect
5378 || h->root.type == bfd_link_hash_warning)
5379 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5380 eh = (struct ppc_link_hash_entry *) h;
5381
5382 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
5383 if (p->sec == sec)
5384 {
5385 /* Everything must go for SEC. */
5386 *pp = p->next;
5387 break;
5388 }
5389 }
5390
5391 switch (r_type)
5392 {
5393 case R_PPC64_GOT_TLSLD16:
5394 case R_PPC64_GOT_TLSLD16_LO:
5395 case R_PPC64_GOT_TLSLD16_HI:
5396 case R_PPC64_GOT_TLSLD16_HA:
5397 tls_type = TLS_TLS | TLS_LD;
5398 goto dogot;
5399
5400 case R_PPC64_GOT_TLSGD16:
5401 case R_PPC64_GOT_TLSGD16_LO:
5402 case R_PPC64_GOT_TLSGD16_HI:
5403 case R_PPC64_GOT_TLSGD16_HA:
5404 tls_type = TLS_TLS | TLS_GD;
5405 goto dogot;
5406
5407 case R_PPC64_GOT_TPREL16_DS:
5408 case R_PPC64_GOT_TPREL16_LO_DS:
5409 case R_PPC64_GOT_TPREL16_HI:
5410 case R_PPC64_GOT_TPREL16_HA:
5411 tls_type = TLS_TLS | TLS_TPREL;
5412 goto dogot;
5413
5414 case R_PPC64_GOT_DTPREL16_DS:
5415 case R_PPC64_GOT_DTPREL16_LO_DS:
5416 case R_PPC64_GOT_DTPREL16_HI:
5417 case R_PPC64_GOT_DTPREL16_HA:
5418 tls_type = TLS_TLS | TLS_DTPREL;
5419 goto dogot;
5420
5421 case R_PPC64_GOT16:
5422 case R_PPC64_GOT16_DS:
5423 case R_PPC64_GOT16_HA:
5424 case R_PPC64_GOT16_HI:
5425 case R_PPC64_GOT16_LO:
5426 case R_PPC64_GOT16_LO_DS:
5427 dogot:
5428 {
5429 struct got_entry *ent;
5430
5431 if (h != NULL)
5432 ent = h->got.glist;
5433 else
5434 ent = local_got_ents[r_symndx];
5435
5436 for (; ent != NULL; ent = ent->next)
5437 if (ent->addend == rel->r_addend
5438 && ent->owner == abfd
5439 && ent->tls_type == tls_type)
5440 break;
5441 if (ent == NULL)
5442 abort ();
5443 if (ent->got.refcount > 0)
5444 ent->got.refcount -= 1;
5445 }
5446 break;
5447
5448 case R_PPC64_PLT16_HA:
5449 case R_PPC64_PLT16_HI:
5450 case R_PPC64_PLT16_LO:
5451 case R_PPC64_PLT32:
5452 case R_PPC64_PLT64:
5453 case R_PPC64_REL14:
5454 case R_PPC64_REL14_BRNTAKEN:
5455 case R_PPC64_REL14_BRTAKEN:
5456 case R_PPC64_REL24:
5457 if (h != NULL)
5458 {
5459 struct plt_entry *ent;
5460
5461 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
5462 if (ent->addend == rel->r_addend)
5463 break;
5464 if (ent != NULL && ent->plt.refcount > 0)
5465 ent->plt.refcount -= 1;
5466 }
5467 break;
5468
5469 default:
5470 break;
5471 }
5472 }
5473 return TRUE;
5474 }
5475
5476 /* The maximum size of .sfpr. */
5477 #define SFPR_MAX (218*4)
5478
5479 struct sfpr_def_parms
5480 {
5481 const char name[12];
5482 unsigned char lo, hi;
5483 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int);
5484 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int);
5485 };
5486
5487 /* Auto-generate _save*, _rest* functions in .sfpr. */
5488
5489 static unsigned int
sfpr_define(struct bfd_link_info * info,const struct sfpr_def_parms * parm)5490 sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm)
5491 {
5492 struct ppc_link_hash_table *htab = ppc_hash_table (info);
5493 unsigned int i;
5494 size_t len = strlen (parm->name);
5495 bfd_boolean writing = FALSE;
5496 char sym[16];
5497
5498 memcpy (sym, parm->name, len);
5499 sym[len + 2] = 0;
5500
5501 for (i = parm->lo; i <= parm->hi; i++)
5502 {
5503 struct elf_link_hash_entry *h;
5504
5505 sym[len + 0] = i / 10 + '0';
5506 sym[len + 1] = i % 10 + '0';
5507 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE);
5508 if (h != NULL
5509 && !h->def_regular)
5510 {
5511 h->root.type = bfd_link_hash_defined;
5512 h->root.u.def.section = htab->sfpr;
5513 h->root.u.def.value = htab->sfpr->size;
5514 h->type = STT_FUNC;
5515 h->def_regular = 1;
5516 _bfd_elf_link_hash_hide_symbol (info, h, TRUE);
5517 writing = TRUE;
5518 if (htab->sfpr->contents == NULL)
5519 {
5520 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX);
5521 if (htab->sfpr->contents == NULL)
5522 return FALSE;
5523 }
5524 }
5525 if (writing)
5526 {
5527 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size;
5528 if (i != parm->hi)
5529 p = (*parm->write_ent) (htab->elf.dynobj, p, i);
5530 else
5531 p = (*parm->write_tail) (htab->elf.dynobj, p, i);
5532 htab->sfpr->size = p - htab->sfpr->contents;
5533 }
5534 }
5535
5536 return TRUE;
5537 }
5538
5539 static bfd_byte *
savegpr0(bfd * abfd,bfd_byte * p,int r)5540 savegpr0 (bfd *abfd, bfd_byte *p, int r)
5541 {
5542 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5543 return p + 4;
5544 }
5545
5546 static bfd_byte *
savegpr0_tail(bfd * abfd,bfd_byte * p,int r)5547 savegpr0_tail (bfd *abfd, bfd_byte *p, int r)
5548 {
5549 p = savegpr0 (abfd, p, r);
5550 bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
5551 p = p + 4;
5552 bfd_put_32 (abfd, BLR, p);
5553 return p + 4;
5554 }
5555
5556 static bfd_byte *
restgpr0(bfd * abfd,bfd_byte * p,int r)5557 restgpr0 (bfd *abfd, bfd_byte *p, int r)
5558 {
5559 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5560 return p + 4;
5561 }
5562
5563 static bfd_byte *
restgpr0_tail(bfd * abfd,bfd_byte * p,int r)5564 restgpr0_tail (bfd *abfd, bfd_byte *p, int r)
5565 {
5566 bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
5567 p = p + 4;
5568 p = restgpr0 (abfd, p, r);
5569 bfd_put_32 (abfd, MTLR_R0, p);
5570 p = p + 4;
5571 if (r == 29)
5572 {
5573 p = restgpr0 (abfd, p, 30);
5574 p = restgpr0 (abfd, p, 31);
5575 }
5576 bfd_put_32 (abfd, BLR, p);
5577 return p + 4;
5578 }
5579
5580 static bfd_byte *
savegpr1(bfd * abfd,bfd_byte * p,int r)5581 savegpr1 (bfd *abfd, bfd_byte *p, int r)
5582 {
5583 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5584 return p + 4;
5585 }
5586
5587 static bfd_byte *
savegpr1_tail(bfd * abfd,bfd_byte * p,int r)5588 savegpr1_tail (bfd *abfd, bfd_byte *p, int r)
5589 {
5590 p = savegpr1 (abfd, p, r);
5591 bfd_put_32 (abfd, BLR, p);
5592 return p + 4;
5593 }
5594
5595 static bfd_byte *
restgpr1(bfd * abfd,bfd_byte * p,int r)5596 restgpr1 (bfd *abfd, bfd_byte *p, int r)
5597 {
5598 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5599 return p + 4;
5600 }
5601
5602 static bfd_byte *
restgpr1_tail(bfd * abfd,bfd_byte * p,int r)5603 restgpr1_tail (bfd *abfd, bfd_byte *p, int r)
5604 {
5605 p = restgpr1 (abfd, p, r);
5606 bfd_put_32 (abfd, BLR, p);
5607 return p + 4;
5608 }
5609
5610 static bfd_byte *
savefpr(bfd * abfd,bfd_byte * p,int r)5611 savefpr (bfd *abfd, bfd_byte *p, int r)
5612 {
5613 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5614 return p + 4;
5615 }
5616
5617 static bfd_byte *
savefpr0_tail(bfd * abfd,bfd_byte * p,int r)5618 savefpr0_tail (bfd *abfd, bfd_byte *p, int r)
5619 {
5620 p = savefpr (abfd, p, r);
5621 bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
5622 p = p + 4;
5623 bfd_put_32 (abfd, BLR, p);
5624 return p + 4;
5625 }
5626
5627 static bfd_byte *
restfpr(bfd * abfd,bfd_byte * p,int r)5628 restfpr (bfd *abfd, bfd_byte *p, int r)
5629 {
5630 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5631 return p + 4;
5632 }
5633
5634 static bfd_byte *
restfpr0_tail(bfd * abfd,bfd_byte * p,int r)5635 restfpr0_tail (bfd *abfd, bfd_byte *p, int r)
5636 {
5637 bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
5638 p = p + 4;
5639 p = restfpr (abfd, p, r);
5640 bfd_put_32 (abfd, MTLR_R0, p);
5641 p = p + 4;
5642 if (r == 29)
5643 {
5644 p = restfpr (abfd, p, 30);
5645 p = restfpr (abfd, p, 31);
5646 }
5647 bfd_put_32 (abfd, BLR, p);
5648 return p + 4;
5649 }
5650
5651 static bfd_byte *
savefpr1_tail(bfd * abfd,bfd_byte * p,int r)5652 savefpr1_tail (bfd *abfd, bfd_byte *p, int r)
5653 {
5654 p = savefpr (abfd, p, r);
5655 bfd_put_32 (abfd, BLR, p);
5656 return p + 4;
5657 }
5658
5659 static bfd_byte *
restfpr1_tail(bfd * abfd,bfd_byte * p,int r)5660 restfpr1_tail (bfd *abfd, bfd_byte *p, int r)
5661 {
5662 p = restfpr (abfd, p, r);
5663 bfd_put_32 (abfd, BLR, p);
5664 return p + 4;
5665 }
5666
5667 static bfd_byte *
savevr(bfd * abfd,bfd_byte * p,int r)5668 savevr (bfd *abfd, bfd_byte *p, int r)
5669 {
5670 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p);
5671 p = p + 4;
5672 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p);
5673 return p + 4;
5674 }
5675
5676 static bfd_byte *
savevr_tail(bfd * abfd,bfd_byte * p,int r)5677 savevr_tail (bfd *abfd, bfd_byte *p, int r)
5678 {
5679 p = savevr (abfd, p, r);
5680 bfd_put_32 (abfd, BLR, p);
5681 return p + 4;
5682 }
5683
5684 static bfd_byte *
restvr(bfd * abfd,bfd_byte * p,int r)5685 restvr (bfd *abfd, bfd_byte *p, int r)
5686 {
5687 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p);
5688 p = p + 4;
5689 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p);
5690 return p + 4;
5691 }
5692
5693 static bfd_byte *
restvr_tail(bfd * abfd,bfd_byte * p,int r)5694 restvr_tail (bfd *abfd, bfd_byte *p, int r)
5695 {
5696 p = restvr (abfd, p, r);
5697 bfd_put_32 (abfd, BLR, p);
5698 return p + 4;
5699 }
5700
5701 /* Called via elf_link_hash_traverse to transfer dynamic linking
5702 information on function code symbol entries to their corresponding
5703 function descriptor symbol entries. */
5704
5705 static bfd_boolean
func_desc_adjust(struct elf_link_hash_entry * h,void * inf)5706 func_desc_adjust (struct elf_link_hash_entry *h, void *inf)
5707 {
5708 struct bfd_link_info *info;
5709 struct ppc_link_hash_table *htab;
5710 struct plt_entry *ent;
5711 struct ppc_link_hash_entry *fh;
5712 struct ppc_link_hash_entry *fdh;
5713 bfd_boolean force_local;
5714
5715 fh = (struct ppc_link_hash_entry *) h;
5716 if (fh->elf.root.type == bfd_link_hash_indirect)
5717 return TRUE;
5718
5719 if (fh->elf.root.type == bfd_link_hash_warning)
5720 fh = (struct ppc_link_hash_entry *) fh->elf.root.u.i.link;
5721
5722 info = inf;
5723 htab = ppc_hash_table (info);
5724
5725 /* Resolve undefined references to dot-symbols as the value
5726 in the function descriptor, if we have one in a regular object.
5727 This is to satisfy cases like ".quad .foo". Calls to functions
5728 in dynamic objects are handled elsewhere. */
5729 if (fh->elf.root.type == bfd_link_hash_undefweak
5730 && fh->was_undefined
5731 && (fh->oh->elf.root.type == bfd_link_hash_defined
5732 || fh->oh->elf.root.type == bfd_link_hash_defweak)
5733 && get_opd_info (fh->oh->elf.root.u.def.section) != NULL
5734 && opd_entry_value (fh->oh->elf.root.u.def.section,
5735 fh->oh->elf.root.u.def.value,
5736 &fh->elf.root.u.def.section,
5737 &fh->elf.root.u.def.value) != (bfd_vma) -1)
5738 {
5739 fh->elf.root.type = fh->oh->elf.root.type;
5740 fh->elf.forced_local = 1;
5741 fh->elf.def_regular = fh->oh->elf.def_regular;
5742 fh->elf.def_dynamic = fh->oh->elf.def_dynamic;
5743 }
5744
5745 /* If this is a function code symbol, transfer dynamic linking
5746 information to the function descriptor symbol. */
5747 if (!fh->is_func)
5748 return TRUE;
5749
5750 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next)
5751 if (ent->plt.refcount > 0)
5752 break;
5753 if (ent == NULL
5754 || fh->elf.root.root.string[0] != '.'
5755 || fh->elf.root.root.string[1] == '\0')
5756 return TRUE;
5757
5758 /* Find the corresponding function descriptor symbol. Create it
5759 as undefined if necessary. */
5760
5761 fdh = get_fdh (fh, htab);
5762 if (fdh != NULL)
5763 while (fdh->elf.root.type == bfd_link_hash_indirect
5764 || fdh->elf.root.type == bfd_link_hash_warning)
5765 fdh = (struct ppc_link_hash_entry *) fdh->elf.root.u.i.link;
5766
5767 if (fdh == NULL
5768 && info->shared
5769 && (fh->elf.root.type == bfd_link_hash_undefined
5770 || fh->elf.root.type == bfd_link_hash_undefweak))
5771 {
5772 fdh = make_fdh (info, fh);
5773 if (fdh == NULL)
5774 return FALSE;
5775 }
5776
5777 /* Fake function descriptors are made undefweak. If the function
5778 code symbol is strong undefined, make the fake sym the same.
5779 If the function code symbol is defined, then force the fake
5780 descriptor local; We can't support overriding of symbols in a
5781 shared library on a fake descriptor. */
5782
5783 if (fdh != NULL
5784 && fdh->fake
5785 && fdh->elf.root.type == bfd_link_hash_undefweak)
5786 {
5787 if (fh->elf.root.type == bfd_link_hash_undefined)
5788 {
5789 fdh->elf.root.type = bfd_link_hash_undefined;
5790 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root);
5791 }
5792 else if (fh->elf.root.type == bfd_link_hash_defined
5793 || fh->elf.root.type == bfd_link_hash_defweak)
5794 {
5795 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE);
5796 }
5797 }
5798
5799 if (fdh != NULL
5800 && !fdh->elf.forced_local
5801 && (info->shared
5802 || fdh->elf.def_dynamic
5803 || fdh->elf.ref_dynamic
5804 || (fdh->elf.root.type == bfd_link_hash_undefweak
5805 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT)))
5806 {
5807 if (fdh->elf.dynindx == -1)
5808 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf))
5809 return FALSE;
5810 fdh->elf.ref_regular |= fh->elf.ref_regular;
5811 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic;
5812 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak;
5813 fdh->elf.non_got_ref |= fh->elf.non_got_ref;
5814 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT)
5815 {
5816 move_plt_plist (fh, fdh);
5817 fdh->elf.needs_plt = 1;
5818 }
5819 fdh->is_func_descriptor = 1;
5820 fdh->oh = fh;
5821 fh->oh = fdh;
5822 }
5823
5824 /* Now that the info is on the function descriptor, clear the
5825 function code sym info. Any function code syms for which we
5826 don't have a definition in a regular file, we force local.
5827 This prevents a shared library from exporting syms that have
5828 been imported from another library. Function code syms that
5829 are really in the library we must leave global to prevent the
5830 linker dragging in a definition from a static library. */
5831 force_local = (!fh->elf.def_regular
5832 || fdh == NULL
5833 || !fdh->elf.def_regular
5834 || fdh->elf.forced_local);
5835 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local);
5836
5837 return TRUE;
5838 }
5839
5840 /* Called near the start of bfd_elf_size_dynamic_sections. We use
5841 this hook to a) provide some gcc support functions, and b) transfer
5842 dynamic linking information gathered so far on function code symbol
5843 entries, to their corresponding function descriptor symbol entries. */
5844
5845 static bfd_boolean
ppc64_elf_func_desc_adjust(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)5846 ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED,
5847 struct bfd_link_info *info)
5848 {
5849 struct ppc_link_hash_table *htab;
5850 unsigned int i;
5851 const struct sfpr_def_parms funcs[] =
5852 {
5853 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail },
5854 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail },
5855 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail },
5856 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail },
5857 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail },
5858 { "_savefpr_", 14, 31, savefpr, savefpr0_tail },
5859 { "_restfpr_", 14, 29, restfpr, restfpr0_tail },
5860 { "_restfpr_", 30, 31, restfpr, restfpr0_tail },
5861 { "._savef", 14, 31, savefpr, savefpr1_tail },
5862 { "._restf", 14, 31, restfpr, restfpr1_tail },
5863 { "_savevr_", 20, 31, savevr, savevr_tail },
5864 { "_restvr_", 20, 31, restvr, restvr_tail }
5865 };
5866
5867 htab = ppc_hash_table (info);
5868 if (htab->sfpr == NULL)
5869 /* We don't have any relocs. */
5870 return TRUE;
5871
5872 /* Provide any missing _save* and _rest* functions. */
5873 htab->sfpr->size = 0;
5874 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
5875 if (!sfpr_define (info, &funcs[i]))
5876 return FALSE;
5877
5878 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
5879
5880 if (htab->sfpr->size == 0)
5881 htab->sfpr->flags |= SEC_EXCLUDE;
5882
5883 return TRUE;
5884 }
5885
5886 /* Adjust a symbol defined by a dynamic object and referenced by a
5887 regular object. The current definition is in some section of the
5888 dynamic object, but we're not including those sections. We have to
5889 change the definition to something the rest of the link can
5890 understand. */
5891
5892 static bfd_boolean
ppc64_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)5893 ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
5894 struct elf_link_hash_entry *h)
5895 {
5896 struct ppc_link_hash_table *htab;
5897 asection *s;
5898
5899 htab = ppc_hash_table (info);
5900
5901 /* Deal with function syms. */
5902 if (h->type == STT_FUNC
5903 || h->needs_plt)
5904 {
5905 /* Clear procedure linkage table information for any symbol that
5906 won't need a .plt entry. */
5907 struct plt_entry *ent;
5908 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
5909 if (ent->plt.refcount > 0)
5910 break;
5911 if (ent == NULL
5912 || SYMBOL_CALLS_LOCAL (info, h)
5913 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5914 && h->root.type == bfd_link_hash_undefweak))
5915 {
5916 h->plt.plist = NULL;
5917 h->needs_plt = 0;
5918 }
5919 }
5920 else
5921 h->plt.plist = NULL;
5922
5923 /* If this is a weak symbol, and there is a real definition, the
5924 processor independent code will have arranged for us to see the
5925 real definition first, and we can just use the same value. */
5926 if (h->u.weakdef != NULL)
5927 {
5928 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
5929 || h->u.weakdef->root.type == bfd_link_hash_defweak);
5930 h->root.u.def.section = h->u.weakdef->root.u.def.section;
5931 h->root.u.def.value = h->u.weakdef->root.u.def.value;
5932 if (ELIMINATE_COPY_RELOCS)
5933 h->non_got_ref = h->u.weakdef->non_got_ref;
5934 return TRUE;
5935 }
5936
5937 /* If we are creating a shared library, we must presume that the
5938 only references to the symbol are via the global offset table.
5939 For such cases we need not do anything here; the relocations will
5940 be handled correctly by relocate_section. */
5941 if (info->shared)
5942 return TRUE;
5943
5944 /* If there are no references to this symbol that do not use the
5945 GOT, we don't need to generate a copy reloc. */
5946 if (!h->non_got_ref)
5947 return TRUE;
5948
5949 /* Don't generate a copy reloc for symbols defined in the executable. */
5950 if (!h->def_dynamic || !h->ref_regular || h->def_regular)
5951 return TRUE;
5952
5953 if (ELIMINATE_COPY_RELOCS)
5954 {
5955 struct ppc_link_hash_entry * eh;
5956 struct ppc_dyn_relocs *p;
5957
5958 eh = (struct ppc_link_hash_entry *) h;
5959 for (p = eh->dyn_relocs; p != NULL; p = p->next)
5960 {
5961 s = p->sec->output_section;
5962 if (s != NULL && (s->flags & SEC_READONLY) != 0)
5963 break;
5964 }
5965
5966 /* If we didn't find any dynamic relocs in read-only sections, then
5967 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
5968 if (p == NULL)
5969 {
5970 h->non_got_ref = 0;
5971 return TRUE;
5972 }
5973 }
5974
5975 if (h->plt.plist != NULL)
5976 {
5977 /* We should never get here, but unfortunately there are versions
5978 of gcc out there that improperly (for this ABI) put initialized
5979 function pointers, vtable refs and suchlike in read-only
5980 sections. Allow them to proceed, but warn that this might
5981 break at runtime. */
5982 (*_bfd_error_handler)
5983 (_("copy reloc against `%s' requires lazy plt linking; "
5984 "avoid setting LD_BIND_NOW=1 or upgrade gcc"),
5985 h->root.root.string);
5986 }
5987
5988 /* This is a reference to a symbol defined by a dynamic object which
5989 is not a function. */
5990
5991 if (h->size == 0)
5992 {
5993 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
5994 h->root.root.string);
5995 return TRUE;
5996 }
5997
5998 /* We must allocate the symbol in our .dynbss section, which will
5999 become part of the .bss section of the executable. There will be
6000 an entry for this symbol in the .dynsym section. The dynamic
6001 object will contain position independent code, so all references
6002 from the dynamic object to this symbol will go through the global
6003 offset table. The dynamic linker will use the .dynsym entry to
6004 determine the address it must put in the global offset table, so
6005 both the dynamic object and the regular object will refer to the
6006 same memory location for the variable. */
6007
6008 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker
6009 to copy the initial value out of the dynamic object and into the
6010 runtime process image. We need to remember the offset into the
6011 .rela.bss section we are going to use. */
6012 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
6013 {
6014 htab->relbss->size += sizeof (Elf64_External_Rela);
6015 h->needs_copy = 1;
6016 }
6017
6018 s = htab->dynbss;
6019
6020 return _bfd_elf_adjust_dynamic_copy (h, s);
6021 }
6022
6023 /* If given a function descriptor symbol, hide both the function code
6024 sym and the descriptor. */
6025 static void
ppc64_elf_hide_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h,bfd_boolean force_local)6026 ppc64_elf_hide_symbol (struct bfd_link_info *info,
6027 struct elf_link_hash_entry *h,
6028 bfd_boolean force_local)
6029 {
6030 struct ppc_link_hash_entry *eh;
6031 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
6032
6033 eh = (struct ppc_link_hash_entry *) h;
6034 if (eh->is_func_descriptor)
6035 {
6036 struct ppc_link_hash_entry *fh = eh->oh;
6037
6038 if (fh == NULL)
6039 {
6040 const char *p, *q;
6041 struct ppc_link_hash_table *htab;
6042 char save;
6043
6044 /* We aren't supposed to use alloca in BFD because on
6045 systems which do not have alloca the version in libiberty
6046 calls xmalloc, which might cause the program to crash
6047 when it runs out of memory. This function doesn't have a
6048 return status, so there's no way to gracefully return an
6049 error. So cheat. We know that string[-1] can be safely
6050 accessed; It's either a string in an ELF string table,
6051 or allocated in an objalloc structure. */
6052
6053 p = eh->elf.root.root.string - 1;
6054 save = *p;
6055 *(char *) p = '.';
6056 htab = ppc_hash_table (info);
6057 fh = (struct ppc_link_hash_entry *)
6058 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE);
6059 *(char *) p = save;
6060
6061 /* Unfortunately, if it so happens that the string we were
6062 looking for was allocated immediately before this string,
6063 then we overwrote the string terminator. That's the only
6064 reason the lookup should fail. */
6065 if (fh == NULL)
6066 {
6067 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string);
6068 while (q >= eh->elf.root.root.string && *q == *p)
6069 --q, --p;
6070 if (q < eh->elf.root.root.string && *p == '.')
6071 fh = (struct ppc_link_hash_entry *)
6072 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE);
6073 }
6074 if (fh != NULL)
6075 {
6076 eh->oh = fh;
6077 fh->oh = eh;
6078 }
6079 }
6080 if (fh != NULL)
6081 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local);
6082 }
6083 }
6084
6085 static bfd_boolean
get_sym_h(struct elf_link_hash_entry ** hp,Elf_Internal_Sym ** symp,asection ** symsecp,char ** tls_maskp,Elf_Internal_Sym ** locsymsp,unsigned long r_symndx,bfd * ibfd)6086 get_sym_h (struct elf_link_hash_entry **hp,
6087 Elf_Internal_Sym **symp,
6088 asection **symsecp,
6089 char **tls_maskp,
6090 Elf_Internal_Sym **locsymsp,
6091 unsigned long r_symndx,
6092 bfd *ibfd)
6093 {
6094 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6095
6096 if (r_symndx >= symtab_hdr->sh_info)
6097 {
6098 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
6099 struct elf_link_hash_entry *h;
6100
6101 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
6102 while (h->root.type == bfd_link_hash_indirect
6103 || h->root.type == bfd_link_hash_warning)
6104 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6105
6106 if (hp != NULL)
6107 *hp = h;
6108
6109 if (symp != NULL)
6110 *symp = NULL;
6111
6112 if (symsecp != NULL)
6113 {
6114 asection *symsec = NULL;
6115 if (h->root.type == bfd_link_hash_defined
6116 || h->root.type == bfd_link_hash_defweak)
6117 symsec = h->root.u.def.section;
6118 *symsecp = symsec;
6119 }
6120
6121 if (tls_maskp != NULL)
6122 {
6123 struct ppc_link_hash_entry *eh;
6124
6125 eh = (struct ppc_link_hash_entry *) h;
6126 *tls_maskp = &eh->tls_mask;
6127 }
6128 }
6129 else
6130 {
6131 Elf_Internal_Sym *sym;
6132 Elf_Internal_Sym *locsyms = *locsymsp;
6133
6134 if (locsyms == NULL)
6135 {
6136 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
6137 if (locsyms == NULL)
6138 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
6139 symtab_hdr->sh_info,
6140 0, NULL, NULL, NULL);
6141 if (locsyms == NULL)
6142 return FALSE;
6143 *locsymsp = locsyms;
6144 }
6145 sym = locsyms + r_symndx;
6146
6147 if (hp != NULL)
6148 *hp = NULL;
6149
6150 if (symp != NULL)
6151 *symp = sym;
6152
6153 if (symsecp != NULL)
6154 {
6155 asection *symsec = NULL;
6156 if ((sym->st_shndx != SHN_UNDEF
6157 && sym->st_shndx < SHN_LORESERVE)
6158 || sym->st_shndx > SHN_HIRESERVE)
6159 symsec = bfd_section_from_elf_index (ibfd, sym->st_shndx);
6160 *symsecp = symsec;
6161 }
6162
6163 if (tls_maskp != NULL)
6164 {
6165 struct got_entry **lgot_ents;
6166 char *tls_mask;
6167
6168 tls_mask = NULL;
6169 lgot_ents = elf_local_got_ents (ibfd);
6170 if (lgot_ents != NULL)
6171 {
6172 char *lgot_masks = (char *) (lgot_ents + symtab_hdr->sh_info);
6173 tls_mask = &lgot_masks[r_symndx];
6174 }
6175 *tls_maskp = tls_mask;
6176 }
6177 }
6178 return TRUE;
6179 }
6180
6181 /* Returns TLS_MASKP for the given REL symbol. Function return is 0 on
6182 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD
6183 type suitable for optimization, and 1 otherwise. */
6184
6185 static int
get_tls_mask(char ** tls_maskp,unsigned long * toc_symndx,bfd_vma * toc_addend,Elf_Internal_Sym ** locsymsp,const Elf_Internal_Rela * rel,bfd * ibfd)6186 get_tls_mask (char **tls_maskp,
6187 unsigned long *toc_symndx,
6188 bfd_vma *toc_addend,
6189 Elf_Internal_Sym **locsymsp,
6190 const Elf_Internal_Rela *rel,
6191 bfd *ibfd)
6192 {
6193 unsigned long r_symndx;
6194 int next_r;
6195 struct elf_link_hash_entry *h;
6196 Elf_Internal_Sym *sym;
6197 asection *sec;
6198 bfd_vma off;
6199
6200 r_symndx = ELF64_R_SYM (rel->r_info);
6201 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd))
6202 return 0;
6203
6204 if ((*tls_maskp != NULL && **tls_maskp != 0)
6205 || sec == NULL
6206 || ppc64_elf_section_data (sec)->sec_type != sec_toc)
6207 return 1;
6208
6209 /* Look inside a TOC section too. */
6210 if (h != NULL)
6211 {
6212 BFD_ASSERT (h->root.type == bfd_link_hash_defined);
6213 off = h->root.u.def.value;
6214 }
6215 else
6216 off = sym->st_value;
6217 off += rel->r_addend;
6218 BFD_ASSERT (off % 8 == 0);
6219 r_symndx = ppc64_elf_section_data (sec)->u.toc.symndx[off / 8];
6220 next_r = ppc64_elf_section_data (sec)->u.toc.symndx[off / 8 + 1];
6221 if (toc_symndx != NULL)
6222 *toc_symndx = r_symndx;
6223 if (toc_addend != NULL)
6224 *toc_addend = ppc64_elf_section_data (sec)->u.toc.add[off / 8];
6225 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd))
6226 return 0;
6227 if ((h == NULL
6228 || ((h->root.type == bfd_link_hash_defined
6229 || h->root.type == bfd_link_hash_defweak)
6230 && !h->def_dynamic))
6231 && (next_r == -1 || next_r == -2))
6232 return 1 - next_r;
6233 return 1;
6234 }
6235
6236 /* Adjust all global syms defined in opd sections. In gcc generated
6237 code for the old ABI, these will already have been done. */
6238
6239 static bfd_boolean
adjust_opd_syms(struct elf_link_hash_entry * h,void * inf ATTRIBUTE_UNUSED)6240 adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
6241 {
6242 struct ppc_link_hash_entry *eh;
6243 asection *sym_sec;
6244 long *opd_adjust;
6245
6246 if (h->root.type == bfd_link_hash_indirect)
6247 return TRUE;
6248
6249 if (h->root.type == bfd_link_hash_warning)
6250 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6251
6252 if (h->root.type != bfd_link_hash_defined
6253 && h->root.type != bfd_link_hash_defweak)
6254 return TRUE;
6255
6256 eh = (struct ppc_link_hash_entry *) h;
6257 if (eh->adjust_done)
6258 return TRUE;
6259
6260 sym_sec = eh->elf.root.u.def.section;
6261 opd_adjust = get_opd_info (sym_sec);
6262 if (opd_adjust != NULL)
6263 {
6264 long adjust = opd_adjust[eh->elf.root.u.def.value / 8];
6265 if (adjust == -1)
6266 {
6267 /* This entry has been deleted. */
6268 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->deleted_section;
6269 if (dsec == NULL)
6270 {
6271 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next)
6272 if (elf_discarded_section (dsec))
6273 {
6274 ppc64_elf_tdata (sym_sec->owner)->deleted_section = dsec;
6275 break;
6276 }
6277 }
6278 eh->elf.root.u.def.value = 0;
6279 eh->elf.root.u.def.section = dsec;
6280 }
6281 else
6282 eh->elf.root.u.def.value += adjust;
6283 eh->adjust_done = 1;
6284 }
6285 return TRUE;
6286 }
6287
6288 /* Handles decrementing dynamic reloc counts for the reloc specified by
6289 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC
6290 have already been determined. */
6291
6292 static bfd_boolean
dec_dynrel_count(bfd_vma r_info,asection * sec,struct bfd_link_info * info,Elf_Internal_Sym ** local_syms,struct elf_link_hash_entry * h,asection * sym_sec)6293 dec_dynrel_count (bfd_vma r_info,
6294 asection *sec,
6295 struct bfd_link_info *info,
6296 Elf_Internal_Sym **local_syms,
6297 struct elf_link_hash_entry *h,
6298 asection *sym_sec)
6299 {
6300 enum elf_ppc64_reloc_type r_type;
6301 struct ppc_dyn_relocs *p;
6302 struct ppc_dyn_relocs **pp;
6303
6304 /* Can this reloc be dynamic? This switch, and later tests here
6305 should be kept in sync with the code in check_relocs. */
6306 r_type = ELF64_R_TYPE (r_info);
6307 switch (r_type)
6308 {
6309 default:
6310 return TRUE;
6311
6312 case R_PPC64_TPREL16:
6313 case R_PPC64_TPREL16_LO:
6314 case R_PPC64_TPREL16_HI:
6315 case R_PPC64_TPREL16_HA:
6316 case R_PPC64_TPREL16_DS:
6317 case R_PPC64_TPREL16_LO_DS:
6318 case R_PPC64_TPREL16_HIGHER:
6319 case R_PPC64_TPREL16_HIGHERA:
6320 case R_PPC64_TPREL16_HIGHEST:
6321 case R_PPC64_TPREL16_HIGHESTA:
6322 if (!info->shared)
6323 return TRUE;
6324
6325 case R_PPC64_TPREL64:
6326 case R_PPC64_DTPMOD64:
6327 case R_PPC64_DTPREL64:
6328 case R_PPC64_ADDR64:
6329 case R_PPC64_REL30:
6330 case R_PPC64_REL32:
6331 case R_PPC64_REL64:
6332 case R_PPC64_ADDR14:
6333 case R_PPC64_ADDR14_BRNTAKEN:
6334 case R_PPC64_ADDR14_BRTAKEN:
6335 case R_PPC64_ADDR16:
6336 case R_PPC64_ADDR16_DS:
6337 case R_PPC64_ADDR16_HA:
6338 case R_PPC64_ADDR16_HI:
6339 case R_PPC64_ADDR16_HIGHER:
6340 case R_PPC64_ADDR16_HIGHERA:
6341 case R_PPC64_ADDR16_HIGHEST:
6342 case R_PPC64_ADDR16_HIGHESTA:
6343 case R_PPC64_ADDR16_LO:
6344 case R_PPC64_ADDR16_LO_DS:
6345 case R_PPC64_ADDR24:
6346 case R_PPC64_ADDR32:
6347 case R_PPC64_UADDR16:
6348 case R_PPC64_UADDR32:
6349 case R_PPC64_UADDR64:
6350 case R_PPC64_TOC:
6351 break;
6352 }
6353
6354 if (local_syms != NULL)
6355 {
6356 unsigned long r_symndx;
6357 Elf_Internal_Sym *sym;
6358 bfd *ibfd = sec->owner;
6359
6360 r_symndx = ELF64_R_SYM (r_info);
6361 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd))
6362 return FALSE;
6363 }
6364
6365 if ((info->shared
6366 && (must_be_dyn_reloc (info, r_type)
6367 || (h != NULL
6368 && (!info->symbolic
6369 || h->root.type == bfd_link_hash_defweak
6370 || !h->def_regular))))
6371 || (ELIMINATE_COPY_RELOCS
6372 && !info->shared
6373 && h != NULL
6374 && (h->root.type == bfd_link_hash_defweak
6375 || !h->def_regular)))
6376 ;
6377 else
6378 return TRUE;
6379
6380 if (h != NULL)
6381 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs;
6382 else
6383 {
6384 if (sym_sec != NULL)
6385 {
6386 void *vpp = &elf_section_data (sym_sec)->local_dynrel;
6387 pp = (struct ppc_dyn_relocs **) vpp;
6388 }
6389 else
6390 {
6391 void *vpp = &elf_section_data (sec)->local_dynrel;
6392 pp = (struct ppc_dyn_relocs **) vpp;
6393 }
6394
6395 /* elf_gc_sweep may have already removed all dyn relocs associated
6396 with local syms for a given section. Don't report a dynreloc
6397 miscount. */
6398 if (*pp == NULL)
6399 return TRUE;
6400 }
6401
6402 while ((p = *pp) != NULL)
6403 {
6404 if (p->sec == sec)
6405 {
6406 if (!must_be_dyn_reloc (info, r_type))
6407 p->pc_count -= 1;
6408 p->count -= 1;
6409 if (p->count == 0)
6410 *pp = p->next;
6411 return TRUE;
6412 }
6413 pp = &p->next;
6414 }
6415
6416 (*_bfd_error_handler) (_("dynreloc miscount for %B, section %A"),
6417 sec->owner, sec);
6418 bfd_set_error (bfd_error_bad_value);
6419 return FALSE;
6420 }
6421
6422 /* Remove unused Official Procedure Descriptor entries. Currently we
6423 only remove those associated with functions in discarded link-once
6424 sections, or weakly defined functions that have been overridden. It
6425 would be possible to remove many more entries for statically linked
6426 applications. */
6427
6428 bfd_boolean
ppc64_elf_edit_opd(bfd * obfd,struct bfd_link_info * info,bfd_boolean no_opd_opt,bfd_boolean non_overlapping)6429 ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info,
6430 bfd_boolean no_opd_opt,
6431 bfd_boolean non_overlapping)
6432 {
6433 bfd *ibfd;
6434 bfd_boolean some_edited = FALSE;
6435 asection *need_pad = NULL;
6436
6437 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6438 {
6439 asection *sec;
6440 Elf_Internal_Rela *relstart, *rel, *relend;
6441 Elf_Internal_Shdr *symtab_hdr;
6442 Elf_Internal_Sym *local_syms;
6443 struct elf_link_hash_entry **sym_hashes;
6444 bfd_vma offset;
6445 bfd_size_type amt;
6446 long *opd_adjust;
6447 bfd_boolean need_edit, add_aux_fields;
6448 bfd_size_type cnt_16b = 0;
6449
6450 sec = bfd_get_section_by_name (ibfd, ".opd");
6451 if (sec == NULL || sec->size == 0)
6452 continue;
6453
6454 amt = sec->size * sizeof (long) / 8;
6455 opd_adjust = get_opd_info (sec);
6456 if (opd_adjust == NULL)
6457 {
6458 /* check_relocs hasn't been called. Must be a ld -r link
6459 or --just-symbols object. */
6460 opd_adjust = bfd_alloc (obfd, amt);
6461 if (opd_adjust == NULL)
6462 return FALSE;
6463 ppc64_elf_section_data (sec)->u.opd_adjust = opd_adjust;
6464 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal);
6465 ppc64_elf_section_data (sec)->sec_type = sec_opd;
6466 }
6467 memset (opd_adjust, 0, amt);
6468
6469 if (no_opd_opt)
6470 continue;
6471
6472 if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
6473 continue;
6474
6475 if (sec->output_section == bfd_abs_section_ptr)
6476 continue;
6477
6478 /* Look through the section relocs. */
6479 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0)
6480 continue;
6481
6482 local_syms = NULL;
6483 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6484 sym_hashes = elf_sym_hashes (ibfd);
6485
6486 /* Read the relocations. */
6487 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
6488 info->keep_memory);
6489 if (relstart == NULL)
6490 return FALSE;
6491
6492 /* First run through the relocs to check they are sane, and to
6493 determine whether we need to edit this opd section. */
6494 need_edit = FALSE;
6495 need_pad = sec;
6496 offset = 0;
6497 relend = relstart + sec->reloc_count;
6498 for (rel = relstart; rel < relend; )
6499 {
6500 enum elf_ppc64_reloc_type r_type;
6501 unsigned long r_symndx;
6502 asection *sym_sec;
6503 struct elf_link_hash_entry *h;
6504 Elf_Internal_Sym *sym;
6505
6506 /* .opd contains a regular array of 16 or 24 byte entries. We're
6507 only interested in the reloc pointing to a function entry
6508 point. */
6509 if (rel->r_offset != offset
6510 || rel + 1 >= relend
6511 || (rel + 1)->r_offset != offset + 8)
6512 {
6513 /* If someone messes with .opd alignment then after a
6514 "ld -r" we might have padding in the middle of .opd.
6515 Also, there's nothing to prevent someone putting
6516 something silly in .opd with the assembler. No .opd
6517 optimization for them! */
6518 broken_opd:
6519 (*_bfd_error_handler)
6520 (_("%B: .opd is not a regular array of opd entries"), ibfd);
6521 need_edit = FALSE;
6522 break;
6523 }
6524
6525 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64
6526 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC)
6527 {
6528 (*_bfd_error_handler)
6529 (_("%B: unexpected reloc type %u in .opd section"),
6530 ibfd, r_type);
6531 need_edit = FALSE;
6532 break;
6533 }
6534
6535 r_symndx = ELF64_R_SYM (rel->r_info);
6536 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
6537 r_symndx, ibfd))
6538 goto error_ret;
6539
6540 if (sym_sec == NULL || sym_sec->owner == NULL)
6541 {
6542 const char *sym_name;
6543 if (h != NULL)
6544 sym_name = h->root.root.string;
6545 else
6546 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym,
6547 sym_sec);
6548
6549 (*_bfd_error_handler)
6550 (_("%B: undefined sym `%s' in .opd section"),
6551 ibfd, sym_name);
6552 need_edit = FALSE;
6553 break;
6554 }
6555
6556 /* opd entries are always for functions defined in the
6557 current input bfd. If the symbol isn't defined in the
6558 input bfd, then we won't be using the function in this
6559 bfd; It must be defined in a linkonce section in another
6560 bfd, or is weak. It's also possible that we are
6561 discarding the function due to a linker script /DISCARD/,
6562 which we test for via the output_section. */
6563 if (sym_sec->owner != ibfd
6564 || sym_sec->output_section == bfd_abs_section_ptr)
6565 need_edit = TRUE;
6566
6567 rel += 2;
6568 if (rel == relend
6569 || (rel + 1 == relend && rel->r_offset == offset + 16))
6570 {
6571 if (sec->size == offset + 24)
6572 {
6573 need_pad = NULL;
6574 break;
6575 }
6576 if (rel == relend && sec->size == offset + 16)
6577 {
6578 cnt_16b++;
6579 break;
6580 }
6581 goto broken_opd;
6582 }
6583
6584 if (rel->r_offset == offset + 24)
6585 offset += 24;
6586 else if (rel->r_offset != offset + 16)
6587 goto broken_opd;
6588 else if (rel + 1 < relend
6589 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64
6590 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC)
6591 {
6592 offset += 16;
6593 cnt_16b++;
6594 }
6595 else if (rel + 2 < relend
6596 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64
6597 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC)
6598 {
6599 offset += 24;
6600 rel += 1;
6601 }
6602 else
6603 goto broken_opd;
6604 }
6605
6606 add_aux_fields = non_overlapping && cnt_16b > 0;
6607
6608 if (need_edit || add_aux_fields)
6609 {
6610 Elf_Internal_Rela *write_rel;
6611 bfd_byte *rptr, *wptr;
6612 bfd_byte *new_contents = NULL;
6613 bfd_boolean skip;
6614 long opd_ent_size;
6615
6616 /* This seems a waste of time as input .opd sections are all
6617 zeros as generated by gcc, but I suppose there's no reason
6618 this will always be so. We might start putting something in
6619 the third word of .opd entries. */
6620 if ((sec->flags & SEC_IN_MEMORY) == 0)
6621 {
6622 bfd_byte *loc;
6623 if (!bfd_malloc_and_get_section (ibfd, sec, &loc))
6624 {
6625 if (loc != NULL)
6626 free (loc);
6627 error_ret:
6628 if (local_syms != NULL
6629 && symtab_hdr->contents != (unsigned char *) local_syms)
6630 free (local_syms);
6631 if (elf_section_data (sec)->relocs != relstart)
6632 free (relstart);
6633 return FALSE;
6634 }
6635 sec->contents = loc;
6636 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS);
6637 }
6638
6639 elf_section_data (sec)->relocs = relstart;
6640
6641 new_contents = sec->contents;
6642 if (add_aux_fields)
6643 {
6644 new_contents = bfd_malloc (sec->size + cnt_16b * 8);
6645 if (new_contents == NULL)
6646 return FALSE;
6647 need_pad = FALSE;
6648 }
6649 wptr = new_contents;
6650 rptr = sec->contents;
6651
6652 write_rel = relstart;
6653 skip = FALSE;
6654 offset = 0;
6655 opd_ent_size = 0;
6656 for (rel = relstart; rel < relend; rel++)
6657 {
6658 unsigned long r_symndx;
6659 asection *sym_sec;
6660 struct elf_link_hash_entry *h;
6661 Elf_Internal_Sym *sym;
6662
6663 r_symndx = ELF64_R_SYM (rel->r_info);
6664 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
6665 r_symndx, ibfd))
6666 goto error_ret;
6667
6668 if (rel->r_offset == offset)
6669 {
6670 struct ppc_link_hash_entry *fdh = NULL;
6671
6672 /* See if the .opd entry is full 24 byte or
6673 16 byte (with fd_aux entry overlapped with next
6674 fd_func). */
6675 opd_ent_size = 24;
6676 if ((rel + 2 == relend && sec->size == offset + 16)
6677 || (rel + 3 < relend
6678 && rel[2].r_offset == offset + 16
6679 && rel[3].r_offset == offset + 24
6680 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64
6681 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC))
6682 opd_ent_size = 16;
6683
6684 if (h != NULL
6685 && h->root.root.string[0] == '.')
6686 {
6687 fdh = get_fdh ((struct ppc_link_hash_entry *) h,
6688 ppc_hash_table (info));
6689 if (fdh != NULL
6690 && fdh->elf.root.type != bfd_link_hash_defined
6691 && fdh->elf.root.type != bfd_link_hash_defweak)
6692 fdh = NULL;
6693 }
6694
6695 skip = (sym_sec->owner != ibfd
6696 || sym_sec->output_section == bfd_abs_section_ptr);
6697 if (skip)
6698 {
6699 if (fdh != NULL && sym_sec->owner == ibfd)
6700 {
6701 /* Arrange for the function descriptor sym
6702 to be dropped. */
6703 fdh->elf.root.u.def.value = 0;
6704 fdh->elf.root.u.def.section = sym_sec;
6705 }
6706 opd_adjust[rel->r_offset / 8] = -1;
6707 }
6708 else
6709 {
6710 /* We'll be keeping this opd entry. */
6711
6712 if (fdh != NULL)
6713 {
6714 /* Redefine the function descriptor symbol to
6715 this location in the opd section. It is
6716 necessary to update the value here rather
6717 than using an array of adjustments as we do
6718 for local symbols, because various places
6719 in the generic ELF code use the value
6720 stored in u.def.value. */
6721 fdh->elf.root.u.def.value = wptr - new_contents;
6722 fdh->adjust_done = 1;
6723 }
6724
6725 /* Local syms are a bit tricky. We could
6726 tweak them as they can be cached, but
6727 we'd need to look through the local syms
6728 for the function descriptor sym which we
6729 don't have at the moment. So keep an
6730 array of adjustments. */
6731 opd_adjust[rel->r_offset / 8]
6732 = (wptr - new_contents) - (rptr - sec->contents);
6733
6734 if (wptr != rptr)
6735 memcpy (wptr, rptr, opd_ent_size);
6736 wptr += opd_ent_size;
6737 if (add_aux_fields && opd_ent_size == 16)
6738 {
6739 memset (wptr, '\0', 8);
6740 wptr += 8;
6741 }
6742 }
6743 rptr += opd_ent_size;
6744 offset += opd_ent_size;
6745 }
6746
6747 if (skip)
6748 {
6749 if (!NO_OPD_RELOCS
6750 && !info->relocatable
6751 && !dec_dynrel_count (rel->r_info, sec, info,
6752 NULL, h, sym_sec))
6753 goto error_ret;
6754 }
6755 else
6756 {
6757 /* We need to adjust any reloc offsets to point to the
6758 new opd entries. While we're at it, we may as well
6759 remove redundant relocs. */
6760 rel->r_offset += opd_adjust[(offset - opd_ent_size) / 8];
6761 if (write_rel != rel)
6762 memcpy (write_rel, rel, sizeof (*rel));
6763 ++write_rel;
6764 }
6765 }
6766
6767 sec->size = wptr - new_contents;
6768 sec->reloc_count = write_rel - relstart;
6769 if (add_aux_fields)
6770 {
6771 free (sec->contents);
6772 sec->contents = new_contents;
6773 }
6774
6775 /* Fudge the header size too, as this is used later in
6776 elf_bfd_final_link if we are emitting relocs. */
6777 elf_section_data (sec)->rel_hdr.sh_size
6778 = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize;
6779 BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL);
6780 some_edited = TRUE;
6781 }
6782 else if (elf_section_data (sec)->relocs != relstart)
6783 free (relstart);
6784
6785 if (local_syms != NULL
6786 && symtab_hdr->contents != (unsigned char *) local_syms)
6787 {
6788 if (!info->keep_memory)
6789 free (local_syms);
6790 else
6791 symtab_hdr->contents = (unsigned char *) local_syms;
6792 }
6793 }
6794
6795 if (some_edited)
6796 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL);
6797
6798 /* If we are doing a final link and the last .opd entry is just 16 byte
6799 long, add a 8 byte padding after it. */
6800 if (need_pad != NULL && !info->relocatable)
6801 {
6802 bfd_byte *p;
6803
6804 if ((need_pad->flags & SEC_IN_MEMORY) == 0)
6805 {
6806 BFD_ASSERT (need_pad->size > 0);
6807
6808 p = bfd_malloc (need_pad->size + 8);
6809 if (p == NULL)
6810 return FALSE;
6811
6812 if (! bfd_get_section_contents (need_pad->owner, need_pad,
6813 p, 0, need_pad->size))
6814 return FALSE;
6815
6816 need_pad->contents = p;
6817 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS);
6818 }
6819 else
6820 {
6821 p = bfd_realloc (need_pad->contents, need_pad->size + 8);
6822 if (p == NULL)
6823 return FALSE;
6824
6825 need_pad->contents = p;
6826 }
6827
6828 memset (need_pad->contents + need_pad->size, 0, 8);
6829 need_pad->size += 8;
6830 }
6831
6832 return TRUE;
6833 }
6834
6835 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
6836
6837 asection *
ppc64_elf_tls_setup(bfd * obfd,struct bfd_link_info * info)6838 ppc64_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
6839 {
6840 struct ppc_link_hash_table *htab;
6841
6842 htab = ppc_hash_table (info);
6843 htab->tls_get_addr = ((struct ppc_link_hash_entry *)
6844 elf_link_hash_lookup (&htab->elf, ".__tls_get_addr",
6845 FALSE, FALSE, TRUE));
6846 htab->tls_get_addr_fd = ((struct ppc_link_hash_entry *)
6847 elf_link_hash_lookup (&htab->elf, "__tls_get_addr",
6848 FALSE, FALSE, TRUE));
6849 return _bfd_elf_tls_setup (obfd, info);
6850 }
6851
6852 /* Return TRUE iff REL is a branch reloc with a global symbol matching
6853 HASH1 or HASH2. */
6854
6855 static bfd_boolean
branch_reloc_hash_match(const bfd * ibfd,const Elf_Internal_Rela * rel,const struct ppc_link_hash_entry * hash1,const struct ppc_link_hash_entry * hash2)6856 branch_reloc_hash_match (const bfd *ibfd,
6857 const Elf_Internal_Rela *rel,
6858 const struct ppc_link_hash_entry *hash1,
6859 const struct ppc_link_hash_entry *hash2)
6860 {
6861 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6862 enum elf_ppc64_reloc_type r_type = ELF64_R_TYPE (rel->r_info);
6863 unsigned int r_symndx = ELF64_R_SYM (rel->r_info);
6864
6865 if (r_symndx >= symtab_hdr->sh_info
6866 && (r_type == R_PPC64_REL24
6867 || r_type == R_PPC64_REL14
6868 || r_type == R_PPC64_REL14_BRTAKEN
6869 || r_type == R_PPC64_REL14_BRNTAKEN
6870 || r_type == R_PPC64_ADDR24
6871 || r_type == R_PPC64_ADDR14
6872 || r_type == R_PPC64_ADDR14_BRTAKEN
6873 || r_type == R_PPC64_ADDR14_BRNTAKEN))
6874 {
6875 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
6876 struct elf_link_hash_entry *h;
6877
6878 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
6879 while (h->root.type == bfd_link_hash_indirect
6880 || h->root.type == bfd_link_hash_warning)
6881 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6882 if (h == &hash1->elf || h == &hash2->elf)
6883 return TRUE;
6884 }
6885 return FALSE;
6886 }
6887
6888 /* Run through all the TLS relocs looking for optimization
6889 opportunities. The linker has been hacked (see ppc64elf.em) to do
6890 a preliminary section layout so that we know the TLS segment
6891 offsets. We can't optimize earlier because some optimizations need
6892 to know the tp offset, and we need to optimize before allocating
6893 dynamic relocations. */
6894
6895 bfd_boolean
ppc64_elf_tls_optimize(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)6896 ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
6897 {
6898 bfd *ibfd;
6899 asection *sec;
6900 struct ppc_link_hash_table *htab;
6901 int pass;
6902
6903 if (info->relocatable || !info->executable)
6904 return TRUE;
6905
6906 htab = ppc_hash_table (info);
6907 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6908 {
6909 Elf_Internal_Sym *locsyms = NULL;
6910 asection *toc = bfd_get_section_by_name (ibfd, ".toc");
6911 unsigned char *toc_ref = NULL;
6912
6913 /* Look at all the sections for this file. Make two passes over
6914 the relocs. On the first pass, mark toc entries involved
6915 with tls relocs, and check that tls relocs involved in
6916 setting up a tls_get_addr call are indeed followed by such a
6917 call. If they are not, exclude them from the optimizations
6918 done on the second pass. */
6919 for (pass = 0; pass < 2; ++pass)
6920 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6921 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section))
6922 {
6923 Elf_Internal_Rela *relstart, *rel, *relend;
6924
6925 /* Read the relocations. */
6926 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
6927 info->keep_memory);
6928 if (relstart == NULL)
6929 return FALSE;
6930
6931 relend = relstart + sec->reloc_count;
6932 for (rel = relstart; rel < relend; rel++)
6933 {
6934 enum elf_ppc64_reloc_type r_type;
6935 unsigned long r_symndx;
6936 struct elf_link_hash_entry *h;
6937 Elf_Internal_Sym *sym;
6938 asection *sym_sec;
6939 char *tls_mask;
6940 char tls_set, tls_clear, tls_type = 0;
6941 bfd_vma value;
6942 bfd_boolean ok_tprel, is_local;
6943 long toc_ref_index = 0;
6944 int expecting_tls_get_addr = 0;
6945
6946 r_symndx = ELF64_R_SYM (rel->r_info);
6947 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms,
6948 r_symndx, ibfd))
6949 {
6950 err_free_rel:
6951 if (elf_section_data (sec)->relocs != relstart)
6952 free (relstart);
6953 if (toc_ref != NULL)
6954 free (toc_ref);
6955 if (locsyms != NULL
6956 && (elf_tdata (ibfd)->symtab_hdr.contents
6957 != (unsigned char *) locsyms))
6958 free (locsyms);
6959 return FALSE;
6960 }
6961
6962 if (h != NULL)
6963 {
6964 if (h->root.type != bfd_link_hash_defined
6965 && h->root.type != bfd_link_hash_defweak)
6966 continue;
6967 value = h->root.u.def.value;
6968 }
6969 else
6970 /* Symbols referenced by TLS relocs must be of type
6971 STT_TLS. So no need for .opd local sym adjust. */
6972 value = sym->st_value;
6973
6974 ok_tprel = FALSE;
6975 is_local = FALSE;
6976 if (h == NULL
6977 || !h->def_dynamic)
6978 {
6979 is_local = TRUE;
6980 value += sym_sec->output_offset;
6981 value += sym_sec->output_section->vma;
6982 value -= htab->elf.tls_sec->vma;
6983 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31)
6984 < (bfd_vma) 1 << 32);
6985 }
6986
6987 r_type = ELF64_R_TYPE (rel->r_info);
6988 switch (r_type)
6989 {
6990 case R_PPC64_GOT_TLSLD16:
6991 case R_PPC64_GOT_TLSLD16_LO:
6992 expecting_tls_get_addr = 1;
6993 /* Fall thru */
6994
6995 case R_PPC64_GOT_TLSLD16_HI:
6996 case R_PPC64_GOT_TLSLD16_HA:
6997 /* These relocs should never be against a symbol
6998 defined in a shared lib. Leave them alone if
6999 that turns out to be the case. */
7000 if (!is_local)
7001 continue;
7002
7003 /* LD -> LE */
7004 tls_set = 0;
7005 tls_clear = TLS_LD;
7006 tls_type = TLS_TLS | TLS_LD;
7007 break;
7008
7009 case R_PPC64_GOT_TLSGD16:
7010 case R_PPC64_GOT_TLSGD16_LO:
7011 expecting_tls_get_addr = 1;
7012 /* Fall thru */
7013
7014 case R_PPC64_GOT_TLSGD16_HI:
7015 case R_PPC64_GOT_TLSGD16_HA:
7016 if (ok_tprel)
7017 /* GD -> LE */
7018 tls_set = 0;
7019 else
7020 /* GD -> IE */
7021 tls_set = TLS_TLS | TLS_TPRELGD;
7022 tls_clear = TLS_GD;
7023 tls_type = TLS_TLS | TLS_GD;
7024 break;
7025
7026 case R_PPC64_GOT_TPREL16_DS:
7027 case R_PPC64_GOT_TPREL16_LO_DS:
7028 case R_PPC64_GOT_TPREL16_HI:
7029 case R_PPC64_GOT_TPREL16_HA:
7030 if (ok_tprel)
7031 {
7032 /* IE -> LE */
7033 tls_set = 0;
7034 tls_clear = TLS_TPREL;
7035 tls_type = TLS_TLS | TLS_TPREL;
7036 break;
7037 }
7038 continue;
7039
7040 case R_PPC64_TOC16:
7041 case R_PPC64_TOC16_LO:
7042 case R_PPC64_TLS:
7043 case R_PPC64_TLSGD:
7044 case R_PPC64_TLSLD:
7045 if (sym_sec == NULL || sym_sec != toc)
7046 continue;
7047
7048 /* Mark this toc entry as referenced by a TLS
7049 code sequence. We can do that now in the
7050 case of R_PPC64_TLS, and after checking for
7051 tls_get_addr for the TOC16 relocs. */
7052 if (toc_ref == NULL)
7053 {
7054 toc_ref = bfd_zmalloc (toc->size / 8);
7055 if (toc_ref == NULL)
7056 goto err_free_rel;
7057 }
7058 if (h != NULL)
7059 value = h->root.u.def.value;
7060 else
7061 value = sym->st_value;
7062 value += rel->r_addend;
7063 BFD_ASSERT (value < toc->size && value % 8 == 0);
7064 toc_ref_index = value / 8;
7065 if (r_type == R_PPC64_TLS
7066 || r_type == R_PPC64_TLSGD
7067 || r_type == R_PPC64_TLSLD)
7068 {
7069 toc_ref[toc_ref_index] = 1;
7070 continue;
7071 }
7072
7073 if (pass != 0 && toc_ref[toc_ref_index] == 0)
7074 continue;
7075
7076 tls_set = 0;
7077 tls_clear = 0;
7078 expecting_tls_get_addr = 2;
7079 break;
7080
7081 case R_PPC64_TPREL64:
7082 if (pass == 0
7083 || sec != toc
7084 || toc_ref == NULL
7085 || !toc_ref[rel->r_offset / 8])
7086 continue;
7087 if (ok_tprel)
7088 {
7089 /* IE -> LE */
7090 tls_set = TLS_EXPLICIT;
7091 tls_clear = TLS_TPREL;
7092 break;
7093 }
7094 continue;
7095
7096 case R_PPC64_DTPMOD64:
7097 if (pass == 0
7098 || sec != toc
7099 || toc_ref == NULL
7100 || !toc_ref[rel->r_offset / 8])
7101 continue;
7102 if (rel + 1 < relend
7103 && (rel[1].r_info
7104 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64))
7105 && rel[1].r_offset == rel->r_offset + 8)
7106 {
7107 if (ok_tprel)
7108 /* GD -> LE */
7109 tls_set = TLS_EXPLICIT | TLS_GD;
7110 else
7111 /* GD -> IE */
7112 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD;
7113 tls_clear = TLS_GD;
7114 }
7115 else
7116 {
7117 if (!is_local)
7118 continue;
7119
7120 /* LD -> LE */
7121 tls_set = TLS_EXPLICIT;
7122 tls_clear = TLS_LD;
7123 }
7124 break;
7125
7126 default:
7127 continue;
7128 }
7129
7130 if (pass == 0)
7131 {
7132 if (!expecting_tls_get_addr
7133 || !sec->has_tls_get_addr_call)
7134 continue;
7135
7136 if (rel + 1 < relend
7137 && branch_reloc_hash_match (ibfd, rel + 1,
7138 htab->tls_get_addr,
7139 htab->tls_get_addr_fd))
7140 {
7141 if (expecting_tls_get_addr == 2)
7142 {
7143 /* Check for toc tls entries. */
7144 char *toc_tls;
7145 int retval;
7146
7147 retval = get_tls_mask (&toc_tls, NULL, NULL,
7148 &locsyms,
7149 rel, ibfd);
7150 if (retval == 0)
7151 goto err_free_rel;
7152 if (retval > 1 && toc_tls != NULL)
7153 toc_ref[toc_ref_index] = 1;
7154 }
7155 continue;
7156 }
7157
7158 if (expecting_tls_get_addr != 1)
7159 continue;
7160
7161 /* Uh oh, we didn't find the expected call. We
7162 could just mark this symbol to exclude it
7163 from tls optimization but it's safer to skip
7164 the entire section. */
7165 sec->has_tls_reloc = 0;
7166 break;
7167 }
7168
7169 if (expecting_tls_get_addr)
7170 {
7171 struct plt_entry *ent;
7172 for (ent = htab->tls_get_addr->elf.plt.plist;
7173 ent != NULL;
7174 ent = ent->next)
7175 if (ent->addend == 0)
7176 {
7177 if (ent->plt.refcount > 0)
7178 {
7179 ent->plt.refcount -= 1;
7180 expecting_tls_get_addr = 0;
7181 }
7182 break;
7183 }
7184 }
7185
7186 if (expecting_tls_get_addr)
7187 {
7188 struct plt_entry *ent;
7189 for (ent = htab->tls_get_addr_fd->elf.plt.plist;
7190 ent != NULL;
7191 ent = ent->next)
7192 if (ent->addend == 0)
7193 {
7194 if (ent->plt.refcount > 0)
7195 ent->plt.refcount -= 1;
7196 break;
7197 }
7198 }
7199
7200 if (tls_clear == 0)
7201 continue;
7202
7203 if ((tls_set & TLS_EXPLICIT) == 0)
7204 {
7205 struct got_entry *ent;
7206
7207 /* Adjust got entry for this reloc. */
7208 if (h != NULL)
7209 ent = h->got.glist;
7210 else
7211 ent = elf_local_got_ents (ibfd)[r_symndx];
7212
7213 for (; ent != NULL; ent = ent->next)
7214 if (ent->addend == rel->r_addend
7215 && ent->owner == ibfd
7216 && ent->tls_type == tls_type)
7217 break;
7218 if (ent == NULL)
7219 abort ();
7220
7221 if (tls_set == 0)
7222 {
7223 /* We managed to get rid of a got entry. */
7224 if (ent->got.refcount > 0)
7225 ent->got.refcount -= 1;
7226 }
7227 }
7228 else
7229 {
7230 /* If we got rid of a DTPMOD/DTPREL reloc pair then
7231 we'll lose one or two dyn relocs. */
7232 if (!dec_dynrel_count (rel->r_info, sec, info,
7233 NULL, h, sym_sec))
7234 return FALSE;
7235
7236 if (tls_set == (TLS_EXPLICIT | TLS_GD))
7237 {
7238 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info,
7239 NULL, h, sym_sec))
7240 return FALSE;
7241 }
7242 }
7243
7244 *tls_mask |= tls_set;
7245 *tls_mask &= ~tls_clear;
7246 }
7247
7248 if (elf_section_data (sec)->relocs != relstart)
7249 free (relstart);
7250 }
7251
7252 if (toc_ref != NULL)
7253 free (toc_ref);
7254
7255 if (locsyms != NULL
7256 && (elf_tdata (ibfd)->symtab_hdr.contents
7257 != (unsigned char *) locsyms))
7258 {
7259 if (!info->keep_memory)
7260 free (locsyms);
7261 else
7262 elf_tdata (ibfd)->symtab_hdr.contents = (unsigned char *) locsyms;
7263 }
7264 }
7265 return TRUE;
7266 }
7267
7268 /* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust
7269 the values of any global symbols in a toc section that has been
7270 edited. Globals in toc sections should be a rarity, so this function
7271 sets a flag if any are found in toc sections other than the one just
7272 edited, so that futher hash table traversals can be avoided. */
7273
7274 struct adjust_toc_info
7275 {
7276 asection *toc;
7277 unsigned long *skip;
7278 bfd_boolean global_toc_syms;
7279 };
7280
7281 static bfd_boolean
adjust_toc_syms(struct elf_link_hash_entry * h,void * inf)7282 adjust_toc_syms (struct elf_link_hash_entry *h, void *inf)
7283 {
7284 struct ppc_link_hash_entry *eh;
7285 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf;
7286
7287 if (h->root.type == bfd_link_hash_indirect)
7288 return TRUE;
7289
7290 if (h->root.type == bfd_link_hash_warning)
7291 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7292
7293 if (h->root.type != bfd_link_hash_defined
7294 && h->root.type != bfd_link_hash_defweak)
7295 return TRUE;
7296
7297 eh = (struct ppc_link_hash_entry *) h;
7298 if (eh->adjust_done)
7299 return TRUE;
7300
7301 if (eh->elf.root.u.def.section == toc_inf->toc)
7302 {
7303 unsigned long skip = toc_inf->skip[eh->elf.root.u.def.value >> 3];
7304 if (skip != (unsigned long) -1)
7305 eh->elf.root.u.def.value -= skip;
7306 else
7307 {
7308 (*_bfd_error_handler)
7309 (_("%s defined in removed toc entry"), eh->elf.root.root.string);
7310 eh->elf.root.u.def.section = &bfd_abs_section;
7311 eh->elf.root.u.def.value = 0;
7312 }
7313 eh->adjust_done = 1;
7314 }
7315 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0)
7316 toc_inf->global_toc_syms = TRUE;
7317
7318 return TRUE;
7319 }
7320
7321 /* Examine all relocs referencing .toc sections in order to remove
7322 unused .toc entries. */
7323
7324 bfd_boolean
ppc64_elf_edit_toc(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)7325 ppc64_elf_edit_toc (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
7326 {
7327 bfd *ibfd;
7328 struct adjust_toc_info toc_inf;
7329
7330 toc_inf.global_toc_syms = TRUE;
7331 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
7332 {
7333 asection *toc, *sec;
7334 Elf_Internal_Shdr *symtab_hdr;
7335 Elf_Internal_Sym *local_syms;
7336 struct elf_link_hash_entry **sym_hashes;
7337 Elf_Internal_Rela *relstart, *rel;
7338 unsigned long *skip, *drop;
7339 unsigned char *used;
7340 unsigned char *keep, last, some_unused;
7341
7342 toc = bfd_get_section_by_name (ibfd, ".toc");
7343 if (toc == NULL
7344 || toc->size == 0
7345 || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS
7346 || elf_discarded_section (toc))
7347 continue;
7348
7349 local_syms = NULL;
7350 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
7351 sym_hashes = elf_sym_hashes (ibfd);
7352
7353 /* Look at sections dropped from the final link. */
7354 skip = NULL;
7355 relstart = NULL;
7356 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
7357 {
7358 if (sec->reloc_count == 0
7359 || !elf_discarded_section (sec)
7360 || get_opd_info (sec)
7361 || (sec->flags & SEC_ALLOC) == 0
7362 || (sec->flags & SEC_DEBUGGING) != 0)
7363 continue;
7364
7365 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE);
7366 if (relstart == NULL)
7367 goto error_ret;
7368
7369 /* Run through the relocs to see which toc entries might be
7370 unused. */
7371 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
7372 {
7373 enum elf_ppc64_reloc_type r_type;
7374 unsigned long r_symndx;
7375 asection *sym_sec;
7376 struct elf_link_hash_entry *h;
7377 Elf_Internal_Sym *sym;
7378 bfd_vma val;
7379
7380 r_type = ELF64_R_TYPE (rel->r_info);
7381 switch (r_type)
7382 {
7383 default:
7384 continue;
7385
7386 case R_PPC64_TOC16:
7387 case R_PPC64_TOC16_LO:
7388 case R_PPC64_TOC16_HI:
7389 case R_PPC64_TOC16_HA:
7390 case R_PPC64_TOC16_DS:
7391 case R_PPC64_TOC16_LO_DS:
7392 break;
7393 }
7394
7395 r_symndx = ELF64_R_SYM (rel->r_info);
7396 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
7397 r_symndx, ibfd))
7398 goto error_ret;
7399
7400 if (sym_sec != toc)
7401 continue;
7402
7403 if (h != NULL)
7404 val = h->root.u.def.value;
7405 else
7406 val = sym->st_value;
7407 val += rel->r_addend;
7408
7409 if (val >= toc->size)
7410 continue;
7411
7412 /* Anything in the toc ought to be aligned to 8 bytes.
7413 If not, don't mark as unused. */
7414 if (val & 7)
7415 continue;
7416
7417 if (skip == NULL)
7418 {
7419 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 7) / 8);
7420 if (skip == NULL)
7421 goto error_ret;
7422 }
7423
7424 skip[val >> 3] = 1;
7425 }
7426
7427 if (elf_section_data (sec)->relocs != relstart)
7428 free (relstart);
7429 }
7430
7431 if (skip == NULL)
7432 continue;
7433
7434 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8);
7435 if (used == NULL)
7436 {
7437 error_ret:
7438 if (local_syms != NULL
7439 && symtab_hdr->contents != (unsigned char *) local_syms)
7440 free (local_syms);
7441 if (sec != NULL
7442 && relstart != NULL
7443 && elf_section_data (sec)->relocs != relstart)
7444 free (relstart);
7445 if (skip != NULL)
7446 free (skip);
7447 return FALSE;
7448 }
7449
7450 /* Now check all kept sections that might reference the toc.
7451 Check the toc itself last. */
7452 for (sec = (ibfd->sections == toc && toc->next ? toc->next
7453 : ibfd->sections);
7454 sec != NULL;
7455 sec = (sec == toc ? NULL
7456 : sec->next == NULL ? toc
7457 : sec->next == toc && toc->next ? toc->next
7458 : sec->next))
7459 {
7460 int repeat;
7461
7462 if (sec->reloc_count == 0
7463 || elf_discarded_section (sec)
7464 || get_opd_info (sec)
7465 || (sec->flags & SEC_ALLOC) == 0
7466 || (sec->flags & SEC_DEBUGGING) != 0)
7467 continue;
7468
7469 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, TRUE);
7470 if (relstart == NULL)
7471 goto error_ret;
7472
7473 /* Mark toc entries referenced as used. */
7474 repeat = 0;
7475 do
7476 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
7477 {
7478 enum elf_ppc64_reloc_type r_type;
7479 unsigned long r_symndx;
7480 asection *sym_sec;
7481 struct elf_link_hash_entry *h;
7482 Elf_Internal_Sym *sym;
7483 bfd_vma val;
7484
7485 r_type = ELF64_R_TYPE (rel->r_info);
7486 switch (r_type)
7487 {
7488 case R_PPC64_TOC16:
7489 case R_PPC64_TOC16_LO:
7490 case R_PPC64_TOC16_HI:
7491 case R_PPC64_TOC16_HA:
7492 case R_PPC64_TOC16_DS:
7493 case R_PPC64_TOC16_LO_DS:
7494 /* In case we're taking addresses of toc entries. */
7495 case R_PPC64_ADDR64:
7496 break;
7497
7498 default:
7499 continue;
7500 }
7501
7502 r_symndx = ELF64_R_SYM (rel->r_info);
7503 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
7504 r_symndx, ibfd))
7505 {
7506 free (used);
7507 goto error_ret;
7508 }
7509
7510 if (sym_sec != toc)
7511 continue;
7512
7513 if (h != NULL)
7514 val = h->root.u.def.value;
7515 else
7516 val = sym->st_value;
7517 val += rel->r_addend;
7518
7519 if (val >= toc->size)
7520 continue;
7521
7522 /* For the toc section, we only mark as used if
7523 this entry itself isn't unused. */
7524 if (sec == toc
7525 && !used[val >> 3]
7526 && (used[rel->r_offset >> 3]
7527 || !skip[rel->r_offset >> 3]))
7528 /* Do all the relocs again, to catch reference
7529 chains. */
7530 repeat = 1;
7531
7532 used[val >> 3] = 1;
7533 }
7534 while (repeat);
7535 }
7536
7537 /* Merge the used and skip arrays. Assume that TOC
7538 doublewords not appearing as either used or unused belong
7539 to to an entry more than one doubleword in size. */
7540 for (drop = skip, keep = used, last = 0, some_unused = 0;
7541 drop < skip + (toc->size + 7) / 8;
7542 ++drop, ++keep)
7543 {
7544 if (*keep)
7545 {
7546 *drop = 0;
7547 last = 0;
7548 }
7549 else if (*drop)
7550 {
7551 some_unused = 1;
7552 last = 1;
7553 }
7554 else
7555 *drop = last;
7556 }
7557
7558 free (used);
7559
7560 if (some_unused)
7561 {
7562 bfd_byte *contents, *src;
7563 unsigned long off;
7564
7565 /* Shuffle the toc contents, and at the same time convert the
7566 skip array from booleans into offsets. */
7567 if (!bfd_malloc_and_get_section (ibfd, toc, &contents))
7568 goto error_ret;
7569
7570 elf_section_data (toc)->this_hdr.contents = contents;
7571
7572 for (src = contents, off = 0, drop = skip;
7573 src < contents + toc->size;
7574 src += 8, ++drop)
7575 {
7576 if (*drop)
7577 {
7578 *drop = (unsigned long) -1;
7579 off += 8;
7580 }
7581 else if (off != 0)
7582 {
7583 *drop = off;
7584 memcpy (src - off, src, 8);
7585 }
7586 }
7587 toc->rawsize = toc->size;
7588 toc->size = src - contents - off;
7589
7590 if (toc->reloc_count != 0)
7591 {
7592 Elf_Internal_Rela *wrel;
7593 bfd_size_type sz;
7594
7595 /* Read toc relocs. */
7596 relstart = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL,
7597 TRUE);
7598 if (relstart == NULL)
7599 goto error_ret;
7600
7601 /* Remove unused toc relocs, and adjust those we keep. */
7602 wrel = relstart;
7603 for (rel = relstart; rel < relstart + toc->reloc_count; ++rel)
7604 if (skip[rel->r_offset >> 3] != (unsigned long) -1)
7605 {
7606 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3];
7607 wrel->r_info = rel->r_info;
7608 wrel->r_addend = rel->r_addend;
7609 ++wrel;
7610 }
7611 else if (!dec_dynrel_count (rel->r_info, toc, info,
7612 &local_syms, NULL, NULL))
7613 goto error_ret;
7614
7615 toc->reloc_count = wrel - relstart;
7616 sz = elf_section_data (toc)->rel_hdr.sh_entsize;
7617 elf_section_data (toc)->rel_hdr.sh_size = toc->reloc_count * sz;
7618 BFD_ASSERT (elf_section_data (toc)->rel_hdr2 == NULL);
7619 }
7620
7621 /* Adjust addends for relocs against the toc section sym. */
7622 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
7623 {
7624 if (sec->reloc_count == 0
7625 || elf_discarded_section (sec))
7626 continue;
7627
7628 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
7629 TRUE);
7630 if (relstart == NULL)
7631 goto error_ret;
7632
7633 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
7634 {
7635 enum elf_ppc64_reloc_type r_type;
7636 unsigned long r_symndx;
7637 asection *sym_sec;
7638 struct elf_link_hash_entry *h;
7639 Elf_Internal_Sym *sym;
7640
7641 r_type = ELF64_R_TYPE (rel->r_info);
7642 switch (r_type)
7643 {
7644 default:
7645 continue;
7646
7647 case R_PPC64_TOC16:
7648 case R_PPC64_TOC16_LO:
7649 case R_PPC64_TOC16_HI:
7650 case R_PPC64_TOC16_HA:
7651 case R_PPC64_TOC16_DS:
7652 case R_PPC64_TOC16_LO_DS:
7653 case R_PPC64_ADDR64:
7654 break;
7655 }
7656
7657 r_symndx = ELF64_R_SYM (rel->r_info);
7658 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
7659 r_symndx, ibfd))
7660 goto error_ret;
7661
7662 if (sym_sec != toc || h != NULL || sym->st_value != 0)
7663 continue;
7664
7665 rel->r_addend -= skip[rel->r_addend >> 3];
7666 }
7667 }
7668
7669 /* We shouldn't have local or global symbols defined in the TOC,
7670 but handle them anyway. */
7671 if (local_syms != NULL)
7672 {
7673 Elf_Internal_Sym *sym;
7674
7675 for (sym = local_syms;
7676 sym < local_syms + symtab_hdr->sh_info;
7677 ++sym)
7678 if (sym->st_shndx != SHN_UNDEF
7679 && (sym->st_shndx < SHN_LORESERVE
7680 || sym->st_shndx > SHN_HIRESERVE)
7681 && sym->st_value != 0
7682 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc)
7683 {
7684 if (skip[sym->st_value >> 3] != (unsigned long) -1)
7685 sym->st_value -= skip[sym->st_value >> 3];
7686 else
7687 {
7688 (*_bfd_error_handler)
7689 (_("%s defined in removed toc entry"),
7690 bfd_elf_sym_name (ibfd, symtab_hdr, sym,
7691 NULL));
7692 sym->st_value = 0;
7693 sym->st_shndx = SHN_ABS;
7694 }
7695 symtab_hdr->contents = (unsigned char *) local_syms;
7696 }
7697 }
7698
7699 /* Finally, adjust any global syms defined in the toc. */
7700 if (toc_inf.global_toc_syms)
7701 {
7702 toc_inf.toc = toc;
7703 toc_inf.skip = skip;
7704 toc_inf.global_toc_syms = FALSE;
7705 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms,
7706 &toc_inf);
7707 }
7708 }
7709
7710 if (local_syms != NULL
7711 && symtab_hdr->contents != (unsigned char *) local_syms)
7712 {
7713 if (!info->keep_memory)
7714 free (local_syms);
7715 else
7716 symtab_hdr->contents = (unsigned char *) local_syms;
7717 }
7718 free (skip);
7719 }
7720
7721 return TRUE;
7722 }
7723
7724 /* Allocate space in .plt, .got and associated reloc sections for
7725 dynamic relocs. */
7726
7727 static bfd_boolean
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)7728 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
7729 {
7730 struct bfd_link_info *info;
7731 struct ppc_link_hash_table *htab;
7732 asection *s;
7733 struct ppc_link_hash_entry *eh;
7734 struct ppc_dyn_relocs *p;
7735 struct got_entry *gent;
7736
7737 if (h->root.type == bfd_link_hash_indirect)
7738 return TRUE;
7739
7740 if (h->root.type == bfd_link_hash_warning)
7741 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7742
7743 info = (struct bfd_link_info *) inf;
7744 htab = ppc_hash_table (info);
7745
7746 if (htab->elf.dynamic_sections_created
7747 && h->dynindx != -1
7748 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h))
7749 {
7750 struct plt_entry *pent;
7751 bfd_boolean doneone = FALSE;
7752 for (pent = h->plt.plist; pent != NULL; pent = pent->next)
7753 if (pent->plt.refcount > 0)
7754 {
7755 /* If this is the first .plt entry, make room for the special
7756 first entry. */
7757 s = htab->plt;
7758 if (s->size == 0)
7759 s->size += PLT_INITIAL_ENTRY_SIZE;
7760
7761 pent->plt.offset = s->size;
7762
7763 /* Make room for this entry. */
7764 s->size += PLT_ENTRY_SIZE;
7765
7766 /* Make room for the .glink code. */
7767 s = htab->glink;
7768 if (s->size == 0)
7769 s->size += GLINK_CALL_STUB_SIZE;
7770 /* We need bigger stubs past index 32767. */
7771 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4)
7772 s->size += 4;
7773 s->size += 2*4;
7774
7775 /* We also need to make an entry in the .rela.plt section. */
7776 s = htab->relplt;
7777 s->size += sizeof (Elf64_External_Rela);
7778 doneone = TRUE;
7779 }
7780 else
7781 pent->plt.offset = (bfd_vma) -1;
7782 if (!doneone)
7783 {
7784 h->plt.plist = NULL;
7785 h->needs_plt = 0;
7786 }
7787 }
7788 else
7789 {
7790 h->plt.plist = NULL;
7791 h->needs_plt = 0;
7792 }
7793
7794 eh = (struct ppc_link_hash_entry *) h;
7795 /* Run through the TLS GD got entries first if we're changing them
7796 to TPREL. */
7797 if ((eh->tls_mask & TLS_TPRELGD) != 0)
7798 for (gent = h->got.glist; gent != NULL; gent = gent->next)
7799 if (gent->got.refcount > 0
7800 && (gent->tls_type & TLS_GD) != 0)
7801 {
7802 /* This was a GD entry that has been converted to TPREL. If
7803 there happens to be a TPREL entry we can use that one. */
7804 struct got_entry *ent;
7805 for (ent = h->got.glist; ent != NULL; ent = ent->next)
7806 if (ent->got.refcount > 0
7807 && (ent->tls_type & TLS_TPREL) != 0
7808 && ent->addend == gent->addend
7809 && ent->owner == gent->owner)
7810 {
7811 gent->got.refcount = 0;
7812 break;
7813 }
7814
7815 /* If not, then we'll be using our own TPREL entry. */
7816 if (gent->got.refcount != 0)
7817 gent->tls_type = TLS_TLS | TLS_TPREL;
7818 }
7819
7820 for (gent = h->got.glist; gent != NULL; gent = gent->next)
7821 if (gent->got.refcount > 0)
7822 {
7823 bfd_boolean dyn;
7824
7825 /* Make sure this symbol is output as a dynamic symbol.
7826 Undefined weak syms won't yet be marked as dynamic,
7827 nor will all TLS symbols. */
7828 if (h->dynindx == -1
7829 && !h->forced_local)
7830 {
7831 if (! bfd_elf_link_record_dynamic_symbol (info, h))
7832 return FALSE;
7833 }
7834
7835 if ((gent->tls_type & TLS_LD) != 0
7836 && !h->def_dynamic)
7837 {
7838 ppc64_tlsld_got (gent->owner)->refcount += 1;
7839 gent->got.offset = (bfd_vma) -1;
7840 continue;
7841 }
7842
7843 s = ppc64_elf_tdata (gent->owner)->got;
7844 gent->got.offset = s->size;
7845 s->size
7846 += (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD)) ? 16 : 8;
7847 dyn = htab->elf.dynamic_sections_created;
7848 if ((info->shared
7849 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))
7850 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
7851 || h->root.type != bfd_link_hash_undefweak))
7852 ppc64_elf_tdata (gent->owner)->relgot->size
7853 += (gent->tls_type & eh->tls_mask & TLS_GD
7854 ? 2 * sizeof (Elf64_External_Rela)
7855 : sizeof (Elf64_External_Rela));
7856 }
7857 else
7858 gent->got.offset = (bfd_vma) -1;
7859
7860 if (eh->dyn_relocs == NULL)
7861 return TRUE;
7862
7863 /* In the shared -Bsymbolic case, discard space allocated for
7864 dynamic pc-relative relocs against symbols which turn out to be
7865 defined in regular objects. For the normal shared case, discard
7866 space for relocs that have become local due to symbol visibility
7867 changes. */
7868
7869 if (info->shared)
7870 {
7871 /* Relocs that use pc_count are those that appear on a call insn,
7872 or certain REL relocs (see must_be_dyn_reloc) that can be
7873 generated via assembly. We want calls to protected symbols to
7874 resolve directly to the function rather than going via the plt.
7875 If people want function pointer comparisons to work as expected
7876 then they should avoid writing weird assembly. */
7877 if (SYMBOL_CALLS_LOCAL (info, h))
7878 {
7879 struct ppc_dyn_relocs **pp;
7880
7881 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
7882 {
7883 p->count -= p->pc_count;
7884 p->pc_count = 0;
7885 if (p->count == 0)
7886 *pp = p->next;
7887 else
7888 pp = &p->next;
7889 }
7890 }
7891
7892 /* Also discard relocs on undefined weak syms with non-default
7893 visibility. */
7894 if (eh->dyn_relocs != NULL
7895 && h->root.type == bfd_link_hash_undefweak)
7896 {
7897 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
7898 eh->dyn_relocs = NULL;
7899
7900 /* Make sure this symbol is output as a dynamic symbol.
7901 Undefined weak syms won't yet be marked as dynamic. */
7902 else if (h->dynindx == -1
7903 && !h->forced_local)
7904 {
7905 if (! bfd_elf_link_record_dynamic_symbol (info, h))
7906 return FALSE;
7907 }
7908 }
7909 }
7910 else if (ELIMINATE_COPY_RELOCS)
7911 {
7912 /* For the non-shared case, discard space for relocs against
7913 symbols which turn out to need copy relocs or are not
7914 dynamic. */
7915
7916 if (!h->non_got_ref
7917 && h->def_dynamic
7918 && !h->def_regular)
7919 {
7920 /* Make sure this symbol is output as a dynamic symbol.
7921 Undefined weak syms won't yet be marked as dynamic. */
7922 if (h->dynindx == -1
7923 && !h->forced_local)
7924 {
7925 if (! bfd_elf_link_record_dynamic_symbol (info, h))
7926 return FALSE;
7927 }
7928
7929 /* If that succeeded, we know we'll be keeping all the
7930 relocs. */
7931 if (h->dynindx != -1)
7932 goto keep;
7933 }
7934
7935 eh->dyn_relocs = NULL;
7936
7937 keep: ;
7938 }
7939
7940 /* Finally, allocate space. */
7941 for (p = eh->dyn_relocs; p != NULL; p = p->next)
7942 {
7943 asection *sreloc = elf_section_data (p->sec)->sreloc;
7944 sreloc->size += p->count * sizeof (Elf64_External_Rela);
7945 }
7946
7947 return TRUE;
7948 }
7949
7950 /* Find any dynamic relocs that apply to read-only sections. */
7951
7952 static bfd_boolean
readonly_dynrelocs(struct elf_link_hash_entry * h,void * inf)7953 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
7954 {
7955 struct ppc_link_hash_entry *eh;
7956 struct ppc_dyn_relocs *p;
7957
7958 if (h->root.type == bfd_link_hash_warning)
7959 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7960
7961 eh = (struct ppc_link_hash_entry *) h;
7962 for (p = eh->dyn_relocs; p != NULL; p = p->next)
7963 {
7964 asection *s = p->sec->output_section;
7965
7966 if (s != NULL && (s->flags & SEC_READONLY) != 0)
7967 {
7968 struct bfd_link_info *info = inf;
7969
7970 info->flags |= DF_TEXTREL;
7971
7972 /* Not an error, just cut short the traversal. */
7973 return FALSE;
7974 }
7975 }
7976 return TRUE;
7977 }
7978
7979 /* Set the sizes of the dynamic sections. */
7980
7981 static bfd_boolean
ppc64_elf_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)7982 ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
7983 struct bfd_link_info *info)
7984 {
7985 struct ppc_link_hash_table *htab;
7986 bfd *dynobj;
7987 asection *s;
7988 bfd_boolean relocs;
7989 bfd *ibfd;
7990
7991 htab = ppc_hash_table (info);
7992 dynobj = htab->elf.dynobj;
7993 if (dynobj == NULL)
7994 abort ();
7995
7996 if (htab->elf.dynamic_sections_created)
7997 {
7998 /* Set the contents of the .interp section to the interpreter. */
7999 if (info->executable)
8000 {
8001 s = bfd_get_section_by_name (dynobj, ".interp");
8002 if (s == NULL)
8003 abort ();
8004 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
8005 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
8006 }
8007 }
8008
8009 /* Set up .got offsets for local syms, and space for local dynamic
8010 relocs. */
8011 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
8012 {
8013 struct got_entry **lgot_ents;
8014 struct got_entry **end_lgot_ents;
8015 char *lgot_masks;
8016 bfd_size_type locsymcount;
8017 Elf_Internal_Shdr *symtab_hdr;
8018 asection *srel;
8019
8020 if (!is_ppc64_elf_target (ibfd->xvec))
8021 continue;
8022
8023 for (s = ibfd->sections; s != NULL; s = s->next)
8024 {
8025 struct ppc_dyn_relocs *p;
8026
8027 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
8028 {
8029 if (!bfd_is_abs_section (p->sec)
8030 && bfd_is_abs_section (p->sec->output_section))
8031 {
8032 /* Input section has been discarded, either because
8033 it is a copy of a linkonce section or due to
8034 linker script /DISCARD/, so we'll be discarding
8035 the relocs too. */
8036 }
8037 else if (p->count != 0)
8038 {
8039 srel = elf_section_data (p->sec)->sreloc;
8040 srel->size += p->count * sizeof (Elf64_External_Rela);
8041 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
8042 info->flags |= DF_TEXTREL;
8043 }
8044 }
8045 }
8046
8047 lgot_ents = elf_local_got_ents (ibfd);
8048 if (!lgot_ents)
8049 continue;
8050
8051 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
8052 locsymcount = symtab_hdr->sh_info;
8053 end_lgot_ents = lgot_ents + locsymcount;
8054 lgot_masks = (char *) end_lgot_ents;
8055 s = ppc64_elf_tdata (ibfd)->got;
8056 srel = ppc64_elf_tdata (ibfd)->relgot;
8057 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks)
8058 {
8059 struct got_entry *ent;
8060
8061 for (ent = *lgot_ents; ent != NULL; ent = ent->next)
8062 if (ent->got.refcount > 0)
8063 {
8064 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0)
8065 {
8066 ppc64_tlsld_got (ibfd)->refcount += 1;
8067 ent->got.offset = (bfd_vma) -1;
8068 }
8069 else
8070 {
8071 ent->got.offset = s->size;
8072 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0)
8073 {
8074 s->size += 16;
8075 if (info->shared)
8076 srel->size += 2 * sizeof (Elf64_External_Rela);
8077 }
8078 else
8079 {
8080 s->size += 8;
8081 if (info->shared)
8082 srel->size += sizeof (Elf64_External_Rela);
8083 }
8084 }
8085 }
8086 else
8087 ent->got.offset = (bfd_vma) -1;
8088 }
8089 }
8090
8091 /* Allocate global sym .plt and .got entries, and space for global
8092 sym dynamic relocs. */
8093 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
8094
8095 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
8096 {
8097 if (!is_ppc64_elf_target (ibfd->xvec))
8098 continue;
8099
8100 if (ppc64_tlsld_got (ibfd)->refcount > 0)
8101 {
8102 s = ppc64_elf_tdata (ibfd)->got;
8103 ppc64_tlsld_got (ibfd)->offset = s->size;
8104 s->size += 16;
8105 if (info->shared)
8106 {
8107 asection *srel = ppc64_elf_tdata (ibfd)->relgot;
8108 srel->size += sizeof (Elf64_External_Rela);
8109 }
8110 }
8111 else
8112 ppc64_tlsld_got (ibfd)->offset = (bfd_vma) -1;
8113 }
8114
8115 /* We now have determined the sizes of the various dynamic sections.
8116 Allocate memory for them. */
8117 relocs = FALSE;
8118 for (s = dynobj->sections; s != NULL; s = s->next)
8119 {
8120 if ((s->flags & SEC_LINKER_CREATED) == 0)
8121 continue;
8122
8123 if (s == htab->brlt || s == htab->relbrlt)
8124 /* These haven't been allocated yet; don't strip. */
8125 continue;
8126 else if (s == htab->got
8127 || s == htab->plt
8128 || s == htab->glink
8129 || s == htab->dynbss)
8130 {
8131 /* Strip this section if we don't need it; see the
8132 comment below. */
8133 }
8134 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
8135 {
8136 if (s->size != 0)
8137 {
8138 if (s != htab->relplt)
8139 relocs = TRUE;
8140
8141 /* We use the reloc_count field as a counter if we need
8142 to copy relocs into the output file. */
8143 s->reloc_count = 0;
8144 }
8145 }
8146 else
8147 {
8148 /* It's not one of our sections, so don't allocate space. */
8149 continue;
8150 }
8151
8152 if (s->size == 0)
8153 {
8154 /* If we don't need this section, strip it from the
8155 output file. This is mostly to handle .rela.bss and
8156 .rela.plt. We must create both sections in
8157 create_dynamic_sections, because they must be created
8158 before the linker maps input sections to output
8159 sections. The linker does that before
8160 adjust_dynamic_symbol is called, and it is that
8161 function which decides whether anything needs to go
8162 into these sections. */
8163 s->flags |= SEC_EXCLUDE;
8164 continue;
8165 }
8166
8167 if ((s->flags & SEC_HAS_CONTENTS) == 0)
8168 continue;
8169
8170 /* Allocate memory for the section contents. We use bfd_zalloc
8171 here in case unused entries are not reclaimed before the
8172 section's contents are written out. This should not happen,
8173 but this way if it does we get a R_PPC64_NONE reloc in .rela
8174 sections instead of garbage.
8175 We also rely on the section contents being zero when writing
8176 the GOT. */
8177 s->contents = bfd_zalloc (dynobj, s->size);
8178 if (s->contents == NULL)
8179 return FALSE;
8180 }
8181
8182 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
8183 {
8184 if (!is_ppc64_elf_target (ibfd->xvec))
8185 continue;
8186
8187 s = ppc64_elf_tdata (ibfd)->got;
8188 if (s != NULL && s != htab->got)
8189 {
8190 if (s->size == 0)
8191 s->flags |= SEC_EXCLUDE;
8192 else
8193 {
8194 s->contents = bfd_zalloc (ibfd, s->size);
8195 if (s->contents == NULL)
8196 return FALSE;
8197 }
8198 }
8199 s = ppc64_elf_tdata (ibfd)->relgot;
8200 if (s != NULL)
8201 {
8202 if (s->size == 0)
8203 s->flags |= SEC_EXCLUDE;
8204 else
8205 {
8206 s->contents = bfd_zalloc (ibfd, s->size);
8207 if (s->contents == NULL)
8208 return FALSE;
8209 relocs = TRUE;
8210 s->reloc_count = 0;
8211 }
8212 }
8213 }
8214
8215 if (htab->elf.dynamic_sections_created)
8216 {
8217 /* Add some entries to the .dynamic section. We fill in the
8218 values later, in ppc64_elf_finish_dynamic_sections, but we
8219 must add the entries now so that we get the correct size for
8220 the .dynamic section. The DT_DEBUG entry is filled in by the
8221 dynamic linker and used by the debugger. */
8222 #define add_dynamic_entry(TAG, VAL) \
8223 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
8224
8225 if (info->executable)
8226 {
8227 if (!add_dynamic_entry (DT_DEBUG, 0))
8228 return FALSE;
8229 }
8230
8231 if (htab->plt != NULL && htab->plt->size != 0)
8232 {
8233 if (!add_dynamic_entry (DT_PLTGOT, 0)
8234 || !add_dynamic_entry (DT_PLTRELSZ, 0)
8235 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
8236 || !add_dynamic_entry (DT_JMPREL, 0)
8237 || !add_dynamic_entry (DT_PPC64_GLINK, 0))
8238 return FALSE;
8239 }
8240
8241 if (NO_OPD_RELOCS)
8242 {
8243 if (!add_dynamic_entry (DT_PPC64_OPD, 0)
8244 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0))
8245 return FALSE;
8246 }
8247
8248 if (relocs)
8249 {
8250 if (!add_dynamic_entry (DT_RELA, 0)
8251 || !add_dynamic_entry (DT_RELASZ, 0)
8252 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
8253 return FALSE;
8254
8255 /* If any dynamic relocs apply to a read-only section,
8256 then we need a DT_TEXTREL entry. */
8257 if ((info->flags & DF_TEXTREL) == 0)
8258 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
8259
8260 if ((info->flags & DF_TEXTREL) != 0)
8261 {
8262 if (!add_dynamic_entry (DT_TEXTREL, 0))
8263 return FALSE;
8264 }
8265 }
8266 }
8267 #undef add_dynamic_entry
8268
8269 return TRUE;
8270 }
8271
8272 /* Determine the type of stub needed, if any, for a call. */
8273
8274 static inline enum ppc_stub_type
ppc_type_of_stub(asection * input_sec,const Elf_Internal_Rela * rel,struct ppc_link_hash_entry ** hash,bfd_vma destination)8275 ppc_type_of_stub (asection *input_sec,
8276 const Elf_Internal_Rela *rel,
8277 struct ppc_link_hash_entry **hash,
8278 bfd_vma destination)
8279 {
8280 struct ppc_link_hash_entry *h = *hash;
8281 bfd_vma location;
8282 bfd_vma branch_offset;
8283 bfd_vma max_branch_offset;
8284 enum elf_ppc64_reloc_type r_type;
8285
8286 if (h != NULL)
8287 {
8288 struct ppc_link_hash_entry *fdh = h;
8289 if (fdh->oh != NULL
8290 && fdh->oh->is_func_descriptor)
8291 fdh = fdh->oh;
8292
8293 if (fdh->elf.dynindx != -1)
8294 {
8295 struct plt_entry *ent;
8296
8297 for (ent = fdh->elf.plt.plist; ent != NULL; ent = ent->next)
8298 if (ent->addend == rel->r_addend
8299 && ent->plt.offset != (bfd_vma) -1)
8300 {
8301 *hash = fdh;
8302 return ppc_stub_plt_call;
8303 }
8304 }
8305
8306 /* Here, we know we don't have a plt entry. If we don't have a
8307 either a defined function descriptor or a defined entry symbol
8308 in a regular object file, then it is pointless trying to make
8309 any other type of stub. */
8310 if (!((fdh->elf.root.type == bfd_link_hash_defined
8311 || fdh->elf.root.type == bfd_link_hash_defweak)
8312 && fdh->elf.root.u.def.section->output_section != NULL)
8313 && !((h->elf.root.type == bfd_link_hash_defined
8314 || h->elf.root.type == bfd_link_hash_defweak)
8315 && h->elf.root.u.def.section->output_section != NULL))
8316 return ppc_stub_none;
8317 }
8318
8319 /* Determine where the call point is. */
8320 location = (input_sec->output_offset
8321 + input_sec->output_section->vma
8322 + rel->r_offset);
8323
8324 branch_offset = destination - location;
8325 r_type = ELF64_R_TYPE (rel->r_info);
8326
8327 /* Determine if a long branch stub is needed. */
8328 max_branch_offset = 1 << 25;
8329 if (r_type != R_PPC64_REL24)
8330 max_branch_offset = 1 << 15;
8331
8332 if (branch_offset + max_branch_offset >= 2 * max_branch_offset)
8333 /* We need a stub. Figure out whether a long_branch or plt_branch
8334 is needed later. */
8335 return ppc_stub_long_branch;
8336
8337 return ppc_stub_none;
8338 }
8339
8340 /* Build a .plt call stub. */
8341
8342 static inline bfd_byte *
build_plt_stub(bfd * obfd,bfd_byte * p,int offset)8343 build_plt_stub (bfd *obfd, bfd_byte *p, int offset)
8344 {
8345 #define PPC_LO(v) ((v) & 0xffff)
8346 #define PPC_HI(v) (((v) >> 16) & 0xffff)
8347 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
8348
8349 if (PPC_HA (offset) != 0)
8350 {
8351 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4;
8352 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
8353 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
8354 if (PPC_HA (offset + 16) != PPC_HA (offset))
8355 {
8356 bfd_put_32 (obfd, ADDI_R12_R12 | PPC_LO (offset), p), p += 4;
8357 offset = 0;
8358 }
8359 bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
8360 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset + 8), p), p += 4;
8361 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset + 16), p), p += 4;
8362 bfd_put_32 (obfd, BCTR, p), p += 4;
8363 }
8364 else
8365 {
8366 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
8367 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset), p), p += 4;
8368 if (PPC_HA (offset + 16) != PPC_HA (offset))
8369 {
8370 bfd_put_32 (obfd, ADDI_R2_R2 | PPC_LO (offset), p), p += 4;
8371 offset = 0;
8372 }
8373 bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
8374 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset + 16), p), p += 4;
8375 bfd_put_32 (obfd, LD_R2_0R2 | PPC_LO (offset + 8), p), p += 4;
8376 bfd_put_32 (obfd, BCTR, p), p += 4;
8377 }
8378 return p;
8379 }
8380
8381 static bfd_boolean
ppc_build_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)8382 ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
8383 {
8384 struct ppc_stub_hash_entry *stub_entry;
8385 struct ppc_branch_hash_entry *br_entry;
8386 struct bfd_link_info *info;
8387 struct ppc_link_hash_table *htab;
8388 bfd_byte *loc;
8389 bfd_byte *p;
8390 unsigned int indx;
8391 struct plt_entry *ent;
8392 bfd_vma dest, off;
8393 int size;
8394
8395 /* Massage our args to the form they really have. */
8396 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
8397 info = in_arg;
8398
8399 htab = ppc_hash_table (info);
8400
8401 /* Make a note of the offset within the stubs for this entry. */
8402 stub_entry->stub_offset = stub_entry->stub_sec->size;
8403 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset;
8404
8405 htab->stub_count[stub_entry->stub_type - 1] += 1;
8406 switch (stub_entry->stub_type)
8407 {
8408 case ppc_stub_long_branch:
8409 case ppc_stub_long_branch_r2off:
8410 /* Branches are relative. This is where we are going to. */
8411 off = dest = (stub_entry->target_value
8412 + stub_entry->target_section->output_offset
8413 + stub_entry->target_section->output_section->vma);
8414
8415 /* And this is where we are coming from. */
8416 off -= (stub_entry->stub_offset
8417 + stub_entry->stub_sec->output_offset
8418 + stub_entry->stub_sec->output_section->vma);
8419
8420 size = 4;
8421 if (stub_entry->stub_type == ppc_stub_long_branch_r2off)
8422 {
8423 bfd_vma r2off;
8424
8425 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off
8426 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8427 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
8428 loc += 4;
8429 size = 12;
8430 if (PPC_HA (r2off) != 0)
8431 {
8432 size = 16;
8433 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc);
8434 loc += 4;
8435 }
8436 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc);
8437 loc += 4;
8438 off -= size - 4;
8439 }
8440 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc);
8441
8442 if (off + (1 << 25) >= (bfd_vma) (1 << 26))
8443 {
8444 (*_bfd_error_handler) (_("long branch stub `%s' offset overflow"),
8445 stub_entry->root.string);
8446 htab->stub_error = TRUE;
8447 return FALSE;
8448 }
8449
8450 if (info->emitrelocations)
8451 {
8452 Elf_Internal_Rela *relocs, *r;
8453 struct bfd_elf_section_data *elfsec_data;
8454
8455 elfsec_data = elf_section_data (stub_entry->stub_sec);
8456 relocs = elfsec_data->relocs;
8457 if (relocs == NULL)
8458 {
8459 bfd_size_type relsize;
8460 relsize = stub_entry->stub_sec->reloc_count * sizeof (*relocs);
8461 relocs = bfd_alloc (htab->stub_bfd, relsize);
8462 if (relocs == NULL)
8463 return FALSE;
8464 elfsec_data->relocs = relocs;
8465 elfsec_data->rel_hdr.sh_size = relsize;
8466 elfsec_data->rel_hdr.sh_entsize = 24;
8467 stub_entry->stub_sec->reloc_count = 0;
8468 }
8469 r = relocs + stub_entry->stub_sec->reloc_count;
8470 stub_entry->stub_sec->reloc_count += 1;
8471 r->r_offset = loc - stub_entry->stub_sec->contents;
8472 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24);
8473 r->r_addend = dest;
8474 if (stub_entry->h != NULL)
8475 {
8476 struct elf_link_hash_entry **hashes;
8477 unsigned long symndx;
8478 struct ppc_link_hash_entry *h;
8479
8480 hashes = elf_sym_hashes (htab->stub_bfd);
8481 if (hashes == NULL)
8482 {
8483 bfd_size_type hsize;
8484
8485 hsize = (htab->stub_globals + 1) * sizeof (*hashes);
8486 hashes = bfd_zalloc (htab->stub_bfd, hsize);
8487 if (hashes == NULL)
8488 return FALSE;
8489 elf_sym_hashes (htab->stub_bfd) = hashes;
8490 htab->stub_globals = 1;
8491 }
8492 symndx = htab->stub_globals++;
8493 h = stub_entry->h;
8494 hashes[symndx] = &h->elf;
8495 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24);
8496 if (h->oh != NULL && h->oh->is_func)
8497 h = h->oh;
8498 if (h->elf.root.u.def.section != stub_entry->target_section)
8499 /* H is an opd symbol. The addend must be zero. */
8500 r->r_addend = 0;
8501 else
8502 {
8503 off = (h->elf.root.u.def.value
8504 + h->elf.root.u.def.section->output_offset
8505 + h->elf.root.u.def.section->output_section->vma);
8506 r->r_addend -= off;
8507 }
8508 }
8509 }
8510 break;
8511
8512 case ppc_stub_plt_branch:
8513 case ppc_stub_plt_branch_r2off:
8514 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
8515 stub_entry->root.string + 9,
8516 FALSE, FALSE);
8517 if (br_entry == NULL)
8518 {
8519 (*_bfd_error_handler) (_("can't find branch stub `%s'"),
8520 stub_entry->root.string);
8521 htab->stub_error = TRUE;
8522 return FALSE;
8523 }
8524
8525 off = (stub_entry->target_value
8526 + stub_entry->target_section->output_offset
8527 + stub_entry->target_section->output_section->vma);
8528
8529 bfd_put_64 (htab->brlt->owner, off,
8530 htab->brlt->contents + br_entry->offset);
8531
8532 if (htab->relbrlt != NULL)
8533 {
8534 /* Create a reloc for the branch lookup table entry. */
8535 Elf_Internal_Rela rela;
8536 bfd_byte *rl;
8537
8538 rela.r_offset = (br_entry->offset
8539 + htab->brlt->output_offset
8540 + htab->brlt->output_section->vma);
8541 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
8542 rela.r_addend = off;
8543
8544 rl = htab->relbrlt->contents;
8545 rl += htab->relbrlt->reloc_count++ * sizeof (Elf64_External_Rela);
8546 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl);
8547 }
8548 else if (info->emitrelocations)
8549 {
8550 Elf_Internal_Rela *relocs, *r;
8551 struct bfd_elf_section_data *elfsec_data;
8552
8553 elfsec_data = elf_section_data (htab->brlt);
8554 relocs = elfsec_data->relocs;
8555 if (relocs == NULL)
8556 {
8557 bfd_size_type relsize;
8558 relsize = htab->brlt->reloc_count * sizeof (*relocs);
8559 relocs = bfd_alloc (htab->brlt->owner, relsize);
8560 if (relocs == NULL)
8561 return FALSE;
8562 elfsec_data->relocs = relocs;
8563 elfsec_data->rel_hdr.sh_size = relsize;
8564 elfsec_data->rel_hdr.sh_entsize = 24;
8565 htab->brlt->reloc_count = 0;
8566 }
8567 r = relocs + htab->brlt->reloc_count;
8568 htab->brlt->reloc_count += 1;
8569 r->r_offset = (br_entry->offset
8570 + htab->brlt->output_offset
8571 + htab->brlt->output_section->vma);
8572 r->r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
8573 r->r_addend = off;
8574 }
8575
8576 off = (br_entry->offset
8577 + htab->brlt->output_offset
8578 + htab->brlt->output_section->vma
8579 - elf_gp (htab->brlt->output_section->owner)
8580 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8581
8582 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
8583 {
8584 (*_bfd_error_handler)
8585 (_("linkage table error against `%s'"),
8586 stub_entry->root.string);
8587 bfd_set_error (bfd_error_bad_value);
8588 htab->stub_error = TRUE;
8589 return FALSE;
8590 }
8591
8592 indx = off;
8593 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off)
8594 {
8595 if (PPC_HA (indx) != 0)
8596 {
8597 size = 16;
8598 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc);
8599 loc += 4;
8600 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc);
8601 }
8602 else
8603 {
8604 size = 12;
8605 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (indx), loc);
8606 }
8607 }
8608 else
8609 {
8610 bfd_vma r2off;
8611
8612 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off
8613 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8614 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
8615 loc += 4;
8616 size = 20;
8617 if (PPC_HA (indx) != 0)
8618 {
8619 size += 4;
8620 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc);
8621 loc += 4;
8622 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc);
8623 loc += 4;
8624 }
8625 else
8626 {
8627 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (indx), loc);
8628 loc += 4;
8629 }
8630
8631 if (PPC_HA (r2off) != 0)
8632 {
8633 size += 4;
8634 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc);
8635 loc += 4;
8636 }
8637 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc);
8638 }
8639 loc += 4;
8640 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc);
8641 loc += 4;
8642 bfd_put_32 (htab->stub_bfd, BCTR, loc);
8643 break;
8644
8645 case ppc_stub_plt_call:
8646 /* Do the best we can for shared libraries built without
8647 exporting ".foo" for each "foo". This can happen when symbol
8648 versioning scripts strip all bar a subset of symbols. */
8649 if (stub_entry->h->oh != NULL
8650 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defined
8651 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defweak)
8652 {
8653 /* Point the symbol at the stub. There may be multiple stubs,
8654 we don't really care; The main thing is to make this sym
8655 defined somewhere. Maybe defining the symbol in the stub
8656 section is a silly idea. If we didn't do this, htab->top_id
8657 could disappear. */
8658 stub_entry->h->oh->elf.root.type = bfd_link_hash_defined;
8659 stub_entry->h->oh->elf.root.u.def.section = stub_entry->stub_sec;
8660 stub_entry->h->oh->elf.root.u.def.value = stub_entry->stub_offset;
8661 }
8662
8663 /* Now build the stub. */
8664 off = (bfd_vma) -1;
8665 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next)
8666 if (ent->addend == stub_entry->addend)
8667 {
8668 off = ent->plt.offset;
8669 break;
8670 }
8671 if (off >= (bfd_vma) -2)
8672 abort ();
8673
8674 off &= ~ (bfd_vma) 1;
8675 off += (htab->plt->output_offset
8676 + htab->plt->output_section->vma
8677 - elf_gp (htab->plt->output_section->owner)
8678 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8679
8680 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
8681 {
8682 (*_bfd_error_handler)
8683 (_("linkage table error against `%s'"),
8684 stub_entry->h->elf.root.root.string);
8685 bfd_set_error (bfd_error_bad_value);
8686 htab->stub_error = TRUE;
8687 return FALSE;
8688 }
8689
8690 p = build_plt_stub (htab->stub_bfd, loc, off);
8691 size = p - loc;
8692 break;
8693
8694 default:
8695 BFD_FAIL ();
8696 return FALSE;
8697 }
8698
8699 stub_entry->stub_sec->size += size;
8700
8701 if (htab->emit_stub_syms)
8702 {
8703 struct elf_link_hash_entry *h;
8704 size_t len1, len2;
8705 char *name;
8706 const char *const stub_str[] = { "long_branch",
8707 "long_branch_r2off",
8708 "plt_branch",
8709 "plt_branch_r2off",
8710 "plt_call" };
8711
8712 len1 = strlen (stub_str[stub_entry->stub_type - 1]);
8713 len2 = strlen (stub_entry->root.string);
8714 name = bfd_malloc (len1 + len2 + 2);
8715 if (name == NULL)
8716 return FALSE;
8717 memcpy (name, stub_entry->root.string, 9);
8718 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1);
8719 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1);
8720 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE);
8721 if (h == NULL)
8722 return FALSE;
8723 if (h->root.type == bfd_link_hash_new)
8724 {
8725 h->root.type = bfd_link_hash_defined;
8726 h->root.u.def.section = stub_entry->stub_sec;
8727 h->root.u.def.value = stub_entry->stub_offset;
8728 h->ref_regular = 1;
8729 h->def_regular = 1;
8730 h->ref_regular_nonweak = 1;
8731 h->forced_local = 1;
8732 h->non_elf = 0;
8733 }
8734 }
8735
8736 return TRUE;
8737 }
8738
8739 /* As above, but don't actually build the stub. Just bump offset so
8740 we know stub section sizes, and select plt_branch stubs where
8741 long_branch stubs won't do. */
8742
8743 static bfd_boolean
ppc_size_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)8744 ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
8745 {
8746 struct ppc_stub_hash_entry *stub_entry;
8747 struct bfd_link_info *info;
8748 struct ppc_link_hash_table *htab;
8749 bfd_vma off;
8750 int size;
8751
8752 /* Massage our args to the form they really have. */
8753 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
8754 info = in_arg;
8755
8756 htab = ppc_hash_table (info);
8757
8758 if (stub_entry->stub_type == ppc_stub_plt_call)
8759 {
8760 struct plt_entry *ent;
8761 off = (bfd_vma) -1;
8762 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next)
8763 if (ent->addend == stub_entry->addend)
8764 {
8765 off = ent->plt.offset & ~(bfd_vma) 1;
8766 break;
8767 }
8768 if (off >= (bfd_vma) -2)
8769 abort ();
8770 off += (htab->plt->output_offset
8771 + htab->plt->output_section->vma
8772 - elf_gp (htab->plt->output_section->owner)
8773 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8774
8775 size = PLT_CALL_STUB_SIZE;
8776 if (PPC_HA (off) == 0)
8777 size -= 4;
8778 if (PPC_HA (off + 16) != PPC_HA (off))
8779 size += 4;
8780 }
8781 else
8782 {
8783 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off
8784 variants. */
8785 bfd_vma r2off = 0;
8786
8787 off = (stub_entry->target_value
8788 + stub_entry->target_section->output_offset
8789 + stub_entry->target_section->output_section->vma);
8790 off -= (stub_entry->stub_sec->size
8791 + stub_entry->stub_sec->output_offset
8792 + stub_entry->stub_sec->output_section->vma);
8793
8794 /* Reset the stub type from the plt variant in case we now
8795 can reach with a shorter stub. */
8796 if (stub_entry->stub_type >= ppc_stub_plt_branch)
8797 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch;
8798
8799 size = 4;
8800 if (stub_entry->stub_type == ppc_stub_long_branch_r2off)
8801 {
8802 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off
8803 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8804 size = 12;
8805 if (PPC_HA (r2off) != 0)
8806 size = 16;
8807 off -= size - 4;
8808 }
8809
8810 /* If the branch offset if too big, use a ppc_stub_plt_branch. */
8811 if (off + (1 << 25) >= (bfd_vma) (1 << 26))
8812 {
8813 struct ppc_branch_hash_entry *br_entry;
8814 unsigned int indx;
8815
8816 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
8817 stub_entry->root.string + 9,
8818 TRUE, FALSE);
8819 if (br_entry == NULL)
8820 {
8821 (*_bfd_error_handler) (_("can't build branch stub `%s'"),
8822 stub_entry->root.string);
8823 htab->stub_error = TRUE;
8824 return FALSE;
8825 }
8826
8827 if (br_entry->iter != htab->stub_iteration)
8828 {
8829 br_entry->iter = htab->stub_iteration;
8830 br_entry->offset = htab->brlt->size;
8831 htab->brlt->size += 8;
8832
8833 if (htab->relbrlt != NULL)
8834 htab->relbrlt->size += sizeof (Elf64_External_Rela);
8835 else if (info->emitrelocations)
8836 {
8837 htab->brlt->reloc_count += 1;
8838 htab->brlt->flags |= SEC_RELOC;
8839 }
8840 }
8841
8842 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch;
8843 off = (br_entry->offset
8844 + htab->brlt->output_offset
8845 + htab->brlt->output_section->vma
8846 - elf_gp (htab->brlt->output_section->owner)
8847 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8848
8849 indx = off;
8850 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off)
8851 {
8852 size = 12;
8853 if (PPC_HA (indx) != 0)
8854 size = 16;
8855 }
8856 else
8857 {
8858 size = 20;
8859 if (PPC_HA (indx) != 0)
8860 size += 4;
8861
8862 if (PPC_HA (r2off) != 0)
8863 size += 4;
8864 }
8865 }
8866 else if (info->emitrelocations)
8867 {
8868 stub_entry->stub_sec->reloc_count += 1;
8869 stub_entry->stub_sec->flags |= SEC_RELOC;
8870 }
8871 }
8872
8873 stub_entry->stub_sec->size += size;
8874 return TRUE;
8875 }
8876
8877 /* Set up various things so that we can make a list of input sections
8878 for each output section included in the link. Returns -1 on error,
8879 0 when no stubs will be needed, and 1 on success. */
8880
8881 int
ppc64_elf_setup_section_lists(bfd * output_bfd,struct bfd_link_info * info,int no_multi_toc)8882 ppc64_elf_setup_section_lists (bfd *output_bfd,
8883 struct bfd_link_info *info,
8884 int no_multi_toc)
8885 {
8886 bfd *input_bfd;
8887 int top_id, top_index, id;
8888 asection *section;
8889 asection **input_list;
8890 bfd_size_type amt;
8891 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8892
8893 htab->no_multi_toc = no_multi_toc;
8894
8895 if (htab->brlt == NULL)
8896 return 0;
8897
8898 /* Find the top input section id. */
8899 for (input_bfd = info->input_bfds, top_id = 3;
8900 input_bfd != NULL;
8901 input_bfd = input_bfd->link_next)
8902 {
8903 for (section = input_bfd->sections;
8904 section != NULL;
8905 section = section->next)
8906 {
8907 if (top_id < section->id)
8908 top_id = section->id;
8909 }
8910 }
8911
8912 htab->top_id = top_id;
8913 amt = sizeof (struct map_stub) * (top_id + 1);
8914 htab->stub_group = bfd_zmalloc (amt);
8915 if (htab->stub_group == NULL)
8916 return -1;
8917
8918 /* Set toc_off for com, und, abs and ind sections. */
8919 for (id = 0; id < 3; id++)
8920 htab->stub_group[id].toc_off = TOC_BASE_OFF;
8921
8922 elf_gp (output_bfd) = htab->toc_curr = ppc64_elf_toc (output_bfd);
8923
8924 /* We can't use output_bfd->section_count here to find the top output
8925 section index as some sections may have been removed, and
8926 strip_excluded_output_sections doesn't renumber the indices. */
8927 for (section = output_bfd->sections, top_index = 0;
8928 section != NULL;
8929 section = section->next)
8930 {
8931 if (top_index < section->index)
8932 top_index = section->index;
8933 }
8934
8935 htab->top_index = top_index;
8936 amt = sizeof (asection *) * (top_index + 1);
8937 input_list = bfd_zmalloc (amt);
8938 htab->input_list = input_list;
8939 if (input_list == NULL)
8940 return -1;
8941
8942 return 1;
8943 }
8944
8945 /* The linker repeatedly calls this function for each TOC input section
8946 and linker generated GOT section. Group input bfds such that the toc
8947 within a group is less than 64k in size. Will break with cute linker
8948 scripts that play games with dot in the output toc section. */
8949
8950 void
ppc64_elf_next_toc_section(struct bfd_link_info * info,asection * isec)8951 ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec)
8952 {
8953 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8954
8955 if (!htab->no_multi_toc)
8956 {
8957 bfd_vma addr = isec->output_offset + isec->output_section->vma;
8958 bfd_vma off = addr - htab->toc_curr;
8959
8960 if (off + isec->size > 0x10000)
8961 htab->toc_curr = addr;
8962
8963 elf_gp (isec->owner) = (htab->toc_curr
8964 - elf_gp (isec->output_section->owner)
8965 + TOC_BASE_OFF);
8966 }
8967 }
8968
8969 /* Called after the last call to the above function. */
8970
8971 void
ppc64_elf_reinit_toc(bfd * output_bfd,struct bfd_link_info * info)8972 ppc64_elf_reinit_toc (bfd *output_bfd, struct bfd_link_info *info)
8973 {
8974 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8975
8976 htab->multi_toc_needed = htab->toc_curr != elf_gp (output_bfd);
8977
8978 /* toc_curr tracks the TOC offset used for code sections below in
8979 ppc64_elf_next_input_section. Start off at 0x8000. */
8980 htab->toc_curr = TOC_BASE_OFF;
8981 }
8982
8983 /* No toc references were found in ISEC. If the code in ISEC makes no
8984 calls, then there's no need to use toc adjusting stubs when branching
8985 into ISEC. Actually, indirect calls from ISEC are OK as they will
8986 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub
8987 needed, and 2 if a cyclical call-graph was found but no other reason
8988 for a stub was detected. If called from the top level, a return of
8989 2 means the same as a return of 0. */
8990
8991 static int
toc_adjusting_stub_needed(struct bfd_link_info * info,asection * isec)8992 toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec)
8993 {
8994 Elf_Internal_Rela *relstart, *rel;
8995 Elf_Internal_Sym *local_syms;
8996 int ret;
8997 struct ppc_link_hash_table *htab;
8998
8999 /* We know none of our code bearing sections will need toc stubs. */
9000 if ((isec->flags & SEC_LINKER_CREATED) != 0)
9001 return 0;
9002
9003 if (isec->size == 0)
9004 return 0;
9005
9006 if (isec->output_section == NULL)
9007 return 0;
9008
9009 /* Hack for linux kernel. .fixup contains branches, but only back to
9010 the function that hit an exception. */
9011 if (strcmp (isec->name, ".fixup") == 0)
9012 return 0;
9013
9014 if (isec->reloc_count == 0)
9015 return 0;
9016
9017 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL,
9018 info->keep_memory);
9019 if (relstart == NULL)
9020 return -1;
9021
9022 /* Look for branches to outside of this section. */
9023 local_syms = NULL;
9024 ret = 0;
9025 htab = ppc_hash_table (info);
9026 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel)
9027 {
9028 enum elf_ppc64_reloc_type r_type;
9029 unsigned long r_symndx;
9030 struct elf_link_hash_entry *h;
9031 struct ppc_link_hash_entry *eh;
9032 Elf_Internal_Sym *sym;
9033 asection *sym_sec;
9034 long *opd_adjust;
9035 bfd_vma sym_value;
9036 bfd_vma dest;
9037
9038 r_type = ELF64_R_TYPE (rel->r_info);
9039 if (r_type != R_PPC64_REL24
9040 && r_type != R_PPC64_REL14
9041 && r_type != R_PPC64_REL14_BRTAKEN
9042 && r_type != R_PPC64_REL14_BRNTAKEN)
9043 continue;
9044
9045 r_symndx = ELF64_R_SYM (rel->r_info);
9046 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx,
9047 isec->owner))
9048 {
9049 ret = -1;
9050 break;
9051 }
9052
9053 /* Calls to dynamic lib functions go through a plt call stub
9054 that uses r2. */
9055 eh = (struct ppc_link_hash_entry *) h;
9056 if (eh != NULL
9057 && (eh->elf.plt.plist != NULL
9058 || (eh->oh != NULL
9059 && eh->oh->elf.plt.plist != NULL)))
9060 {
9061 ret = 1;
9062 break;
9063 }
9064
9065 if (sym_sec == NULL)
9066 /* Ignore other undefined symbols. */
9067 continue;
9068
9069 /* Assume branches to other sections not included in the link need
9070 stubs too, to cover -R and absolute syms. */
9071 if (sym_sec->output_section == NULL)
9072 {
9073 ret = 1;
9074 break;
9075 }
9076
9077 if (h == NULL)
9078 sym_value = sym->st_value;
9079 else
9080 {
9081 if (h->root.type != bfd_link_hash_defined
9082 && h->root.type != bfd_link_hash_defweak)
9083 abort ();
9084 sym_value = h->root.u.def.value;
9085 }
9086 sym_value += rel->r_addend;
9087
9088 /* If this branch reloc uses an opd sym, find the code section. */
9089 opd_adjust = get_opd_info (sym_sec);
9090 if (opd_adjust != NULL)
9091 {
9092 if (h == NULL)
9093 {
9094 long adjust;
9095
9096 adjust = opd_adjust[sym->st_value / 8];
9097 if (adjust == -1)
9098 /* Assume deleted functions won't ever be called. */
9099 continue;
9100 sym_value += adjust;
9101 }
9102
9103 dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL);
9104 if (dest == (bfd_vma) -1)
9105 continue;
9106 }
9107 else
9108 dest = (sym_value
9109 + sym_sec->output_offset
9110 + sym_sec->output_section->vma);
9111
9112 /* Ignore branch to self. */
9113 if (sym_sec == isec)
9114 continue;
9115
9116 /* If the called function uses the toc, we need a stub. */
9117 if (sym_sec->has_toc_reloc
9118 || sym_sec->makes_toc_func_call)
9119 {
9120 ret = 1;
9121 break;
9122 }
9123
9124 /* Assume any branch that needs a long branch stub might in fact
9125 need a plt_branch stub. A plt_branch stub uses r2. */
9126 else if (dest - (isec->output_offset
9127 + isec->output_section->vma
9128 + rel->r_offset) + (1 << 25) >= (2 << 25))
9129 {
9130 ret = 1;
9131 break;
9132 }
9133
9134 /* If calling back to a section in the process of being tested, we
9135 can't say for sure that no toc adjusting stubs are needed, so
9136 don't return zero. */
9137 else if (sym_sec->call_check_in_progress)
9138 ret = 2;
9139
9140 /* Branches to another section that itself doesn't have any TOC
9141 references are OK. Recursively call ourselves to check. */
9142 else if (sym_sec->id <= htab->top_id
9143 && htab->stub_group[sym_sec->id].toc_off == 0)
9144 {
9145 int recur;
9146
9147 /* Mark current section as indeterminate, so that other
9148 sections that call back to current won't be marked as
9149 known. */
9150 isec->call_check_in_progress = 1;
9151 recur = toc_adjusting_stub_needed (info, sym_sec);
9152 isec->call_check_in_progress = 0;
9153
9154 if (recur < 0)
9155 {
9156 /* An error. Exit. */
9157 ret = -1;
9158 break;
9159 }
9160 else if (recur <= 1)
9161 {
9162 /* Known result. Mark as checked and set section flag. */
9163 htab->stub_group[sym_sec->id].toc_off = 1;
9164 if (recur != 0)
9165 {
9166 sym_sec->makes_toc_func_call = 1;
9167 ret = 1;
9168 break;
9169 }
9170 }
9171 else
9172 {
9173 /* Unknown result. Continue checking. */
9174 ret = 2;
9175 }
9176 }
9177 }
9178
9179 if (local_syms != NULL
9180 && (elf_tdata (isec->owner)->symtab_hdr.contents
9181 != (unsigned char *) local_syms))
9182 free (local_syms);
9183 if (elf_section_data (isec)->relocs != relstart)
9184 free (relstart);
9185
9186 return ret;
9187 }
9188
9189 /* The linker repeatedly calls this function for each input section,
9190 in the order that input sections are linked into output sections.
9191 Build lists of input sections to determine groupings between which
9192 we may insert linker stubs. */
9193
9194 bfd_boolean
ppc64_elf_next_input_section(struct bfd_link_info * info,asection * isec)9195 ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec)
9196 {
9197 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9198
9199 if ((isec->output_section->flags & SEC_CODE) != 0
9200 && isec->output_section->index <= htab->top_index)
9201 {
9202 asection **list = htab->input_list + isec->output_section->index;
9203 /* Steal the link_sec pointer for our list. */
9204 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec)
9205 /* This happens to make the list in reverse order,
9206 which is what we want. */
9207 PREV_SEC (isec) = *list;
9208 *list = isec;
9209 }
9210
9211 if (htab->multi_toc_needed)
9212 {
9213 /* If a code section has a function that uses the TOC then we need
9214 to use the right TOC (obviously). Also, make sure that .opd gets
9215 the correct TOC value for R_PPC64_TOC relocs that don't have or
9216 can't find their function symbol (shouldn't ever happen now). */
9217 if (isec->has_toc_reloc || (isec->flags & SEC_CODE) == 0)
9218 {
9219 if (elf_gp (isec->owner) != 0)
9220 htab->toc_curr = elf_gp (isec->owner);
9221 }
9222 else if (htab->stub_group[isec->id].toc_off == 0)
9223 {
9224 int ret = toc_adjusting_stub_needed (info, isec);
9225 if (ret < 0)
9226 return FALSE;
9227 else
9228 isec->makes_toc_func_call = ret & 1;
9229 }
9230 }
9231
9232 /* Functions that don't use the TOC can belong in any TOC group.
9233 Use the last TOC base. This happens to make _init and _fini
9234 pasting work. */
9235 htab->stub_group[isec->id].toc_off = htab->toc_curr;
9236 return TRUE;
9237 }
9238
9239 /* See whether we can group stub sections together. Grouping stub
9240 sections may result in fewer stubs. More importantly, we need to
9241 put all .init* and .fini* stubs at the beginning of the .init or
9242 .fini output sections respectively, because glibc splits the
9243 _init and _fini functions into multiple parts. Putting a stub in
9244 the middle of a function is not a good idea. */
9245
9246 static void
group_sections(struct ppc_link_hash_table * htab,bfd_size_type stub_group_size,bfd_boolean stubs_always_before_branch)9247 group_sections (struct ppc_link_hash_table *htab,
9248 bfd_size_type stub_group_size,
9249 bfd_boolean stubs_always_before_branch)
9250 {
9251 asection **list;
9252 bfd_size_type stub14_group_size;
9253 bfd_boolean suppress_size_errors;
9254
9255 suppress_size_errors = FALSE;
9256 stub14_group_size = stub_group_size;
9257 if (stub_group_size == 1)
9258 {
9259 /* Default values. */
9260 if (stubs_always_before_branch)
9261 {
9262 stub_group_size = 0x1e00000;
9263 stub14_group_size = 0x7800;
9264 }
9265 else
9266 {
9267 stub_group_size = 0x1c00000;
9268 stub14_group_size = 0x7000;
9269 }
9270 suppress_size_errors = TRUE;
9271 }
9272
9273 list = htab->input_list + htab->top_index;
9274 do
9275 {
9276 asection *tail = *list;
9277 while (tail != NULL)
9278 {
9279 asection *curr;
9280 asection *prev;
9281 bfd_size_type total;
9282 bfd_boolean big_sec;
9283 bfd_vma curr_toc;
9284
9285 curr = tail;
9286 total = tail->size;
9287 big_sec = total > (ppc64_elf_section_data (tail)->has_14bit_branch
9288 ? stub14_group_size : stub_group_size);
9289 if (big_sec && !suppress_size_errors)
9290 (*_bfd_error_handler) (_("%B section %A exceeds stub group size"),
9291 tail->owner, tail);
9292 curr_toc = htab->stub_group[tail->id].toc_off;
9293
9294 while ((prev = PREV_SEC (curr)) != NULL
9295 && ((total += curr->output_offset - prev->output_offset)
9296 < (ppc64_elf_section_data (prev)->has_14bit_branch
9297 ? stub14_group_size : stub_group_size))
9298 && htab->stub_group[prev->id].toc_off == curr_toc)
9299 curr = prev;
9300
9301 /* OK, the size from the start of CURR to the end is less
9302 than stub_group_size and thus can be handled by one stub
9303 section. (or the tail section is itself larger than
9304 stub_group_size, in which case we may be toast.) We
9305 should really be keeping track of the total size of stubs
9306 added here, as stubs contribute to the final output
9307 section size. That's a little tricky, and this way will
9308 only break if stubs added make the total size more than
9309 2^25, ie. for the default stub_group_size, if stubs total
9310 more than 2097152 bytes, or nearly 75000 plt call stubs. */
9311 do
9312 {
9313 prev = PREV_SEC (tail);
9314 /* Set up this stub group. */
9315 htab->stub_group[tail->id].link_sec = curr;
9316 }
9317 while (tail != curr && (tail = prev) != NULL);
9318
9319 /* But wait, there's more! Input sections up to stub_group_size
9320 bytes before the stub section can be handled by it too.
9321 Don't do this if we have a really large section after the
9322 stubs, as adding more stubs increases the chance that
9323 branches may not reach into the stub section. */
9324 if (!stubs_always_before_branch && !big_sec)
9325 {
9326 total = 0;
9327 while (prev != NULL
9328 && ((total += tail->output_offset - prev->output_offset)
9329 < (ppc64_elf_section_data (prev)->has_14bit_branch
9330 ? stub14_group_size : stub_group_size))
9331 && htab->stub_group[prev->id].toc_off == curr_toc)
9332 {
9333 tail = prev;
9334 prev = PREV_SEC (tail);
9335 htab->stub_group[tail->id].link_sec = curr;
9336 }
9337 }
9338 tail = prev;
9339 }
9340 }
9341 while (list-- != htab->input_list);
9342 free (htab->input_list);
9343 #undef PREV_SEC
9344 }
9345
9346 /* Determine and set the size of the stub section for a final link.
9347
9348 The basic idea here is to examine all the relocations looking for
9349 PC-relative calls to a target that is unreachable with a "bl"
9350 instruction. */
9351
9352 bfd_boolean
ppc64_elf_size_stubs(bfd * output_bfd,struct bfd_link_info * info,bfd_signed_vma group_size,asection * (* add_stub_section)(const char *,asection *),void (* layout_sections_again)(void))9353 ppc64_elf_size_stubs (bfd *output_bfd,
9354 struct bfd_link_info *info,
9355 bfd_signed_vma group_size,
9356 asection *(*add_stub_section) (const char *, asection *),
9357 void (*layout_sections_again) (void))
9358 {
9359 bfd_size_type stub_group_size;
9360 bfd_boolean stubs_always_before_branch;
9361 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9362
9363 /* Stash our params away. */
9364 htab->add_stub_section = add_stub_section;
9365 htab->layout_sections_again = layout_sections_again;
9366 stubs_always_before_branch = group_size < 0;
9367 if (group_size < 0)
9368 stub_group_size = -group_size;
9369 else
9370 stub_group_size = group_size;
9371
9372 group_sections (htab, stub_group_size, stubs_always_before_branch);
9373
9374 while (1)
9375 {
9376 bfd *input_bfd;
9377 unsigned int bfd_indx;
9378 asection *stub_sec;
9379
9380 htab->stub_iteration += 1;
9381
9382 for (input_bfd = info->input_bfds, bfd_indx = 0;
9383 input_bfd != NULL;
9384 input_bfd = input_bfd->link_next, bfd_indx++)
9385 {
9386 Elf_Internal_Shdr *symtab_hdr;
9387 asection *section;
9388 Elf_Internal_Sym *local_syms = NULL;
9389
9390 if (!is_ppc64_elf_target (input_bfd->xvec))
9391 continue;
9392
9393 /* We'll need the symbol table in a second. */
9394 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9395 if (symtab_hdr->sh_info == 0)
9396 continue;
9397
9398 /* Walk over each section attached to the input bfd. */
9399 for (section = input_bfd->sections;
9400 section != NULL;
9401 section = section->next)
9402 {
9403 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
9404
9405 /* If there aren't any relocs, then there's nothing more
9406 to do. */
9407 if ((section->flags & SEC_RELOC) == 0
9408 || (section->flags & SEC_ALLOC) == 0
9409 || (section->flags & SEC_LOAD) == 0
9410 || (section->flags & SEC_CODE) == 0
9411 || section->reloc_count == 0)
9412 continue;
9413
9414 /* If this section is a link-once section that will be
9415 discarded, then don't create any stubs. */
9416 if (section->output_section == NULL
9417 || section->output_section->owner != output_bfd)
9418 continue;
9419
9420 /* Get the relocs. */
9421 internal_relocs
9422 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
9423 info->keep_memory);
9424 if (internal_relocs == NULL)
9425 goto error_ret_free_local;
9426
9427 /* Now examine each relocation. */
9428 irela = internal_relocs;
9429 irelaend = irela + section->reloc_count;
9430 for (; irela < irelaend; irela++)
9431 {
9432 enum elf_ppc64_reloc_type r_type;
9433 unsigned int r_indx;
9434 enum ppc_stub_type stub_type;
9435 struct ppc_stub_hash_entry *stub_entry;
9436 asection *sym_sec, *code_sec;
9437 bfd_vma sym_value;
9438 bfd_vma destination;
9439 bfd_boolean ok_dest;
9440 struct ppc_link_hash_entry *hash;
9441 struct ppc_link_hash_entry *fdh;
9442 struct elf_link_hash_entry *h;
9443 Elf_Internal_Sym *sym;
9444 char *stub_name;
9445 const asection *id_sec;
9446 long *opd_adjust;
9447
9448 r_type = ELF64_R_TYPE (irela->r_info);
9449 r_indx = ELF64_R_SYM (irela->r_info);
9450
9451 if (r_type >= R_PPC64_max)
9452 {
9453 bfd_set_error (bfd_error_bad_value);
9454 goto error_ret_free_internal;
9455 }
9456
9457 /* Only look for stubs on branch instructions. */
9458 if (r_type != R_PPC64_REL24
9459 && r_type != R_PPC64_REL14
9460 && r_type != R_PPC64_REL14_BRTAKEN
9461 && r_type != R_PPC64_REL14_BRNTAKEN)
9462 continue;
9463
9464 /* Now determine the call target, its name, value,
9465 section. */
9466 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
9467 r_indx, input_bfd))
9468 goto error_ret_free_internal;
9469 hash = (struct ppc_link_hash_entry *) h;
9470
9471 ok_dest = FALSE;
9472 fdh = NULL;
9473 sym_value = 0;
9474 if (hash == NULL)
9475 {
9476 sym_value = sym->st_value;
9477 ok_dest = TRUE;
9478 }
9479 else if (hash->elf.root.type == bfd_link_hash_defined
9480 || hash->elf.root.type == bfd_link_hash_defweak)
9481 {
9482 sym_value = hash->elf.root.u.def.value;
9483 if (sym_sec->output_section != NULL)
9484 ok_dest = TRUE;
9485 }
9486 else if (hash->elf.root.type == bfd_link_hash_undefweak
9487 || hash->elf.root.type == bfd_link_hash_undefined)
9488 {
9489 /* Recognise an old ABI func code entry sym, and
9490 use the func descriptor sym instead if it is
9491 defined. */
9492 if (hash->elf.root.root.string[0] == '.'
9493 && (fdh = get_fdh (hash, htab)) != NULL)
9494 {
9495 if (fdh->elf.root.type == bfd_link_hash_defined
9496 || fdh->elf.root.type == bfd_link_hash_defweak)
9497 {
9498 sym_sec = fdh->elf.root.u.def.section;
9499 sym_value = fdh->elf.root.u.def.value;
9500 if (sym_sec->output_section != NULL)
9501 ok_dest = TRUE;
9502 }
9503 else
9504 fdh = NULL;
9505 }
9506 }
9507 else
9508 {
9509 bfd_set_error (bfd_error_bad_value);
9510 goto error_ret_free_internal;
9511 }
9512
9513 destination = 0;
9514 if (ok_dest)
9515 {
9516 sym_value += irela->r_addend;
9517 destination = (sym_value
9518 + sym_sec->output_offset
9519 + sym_sec->output_section->vma);
9520 }
9521
9522 code_sec = sym_sec;
9523 opd_adjust = get_opd_info (sym_sec);
9524 if (opd_adjust != NULL)
9525 {
9526 bfd_vma dest;
9527
9528 if (hash == NULL)
9529 {
9530 long adjust = opd_adjust[sym_value / 8];
9531 if (adjust == -1)
9532 continue;
9533 sym_value += adjust;
9534 }
9535 dest = opd_entry_value (sym_sec, sym_value,
9536 &code_sec, &sym_value);
9537 if (dest != (bfd_vma) -1)
9538 {
9539 destination = dest;
9540 if (fdh != NULL)
9541 {
9542 /* Fixup old ABI sym to point at code
9543 entry. */
9544 hash->elf.root.type = bfd_link_hash_defweak;
9545 hash->elf.root.u.def.section = code_sec;
9546 hash->elf.root.u.def.value = sym_value;
9547 }
9548 }
9549 }
9550
9551 /* Determine what (if any) linker stub is needed. */
9552 stub_type = ppc_type_of_stub (section, irela, &hash,
9553 destination);
9554
9555 if (stub_type != ppc_stub_plt_call)
9556 {
9557 /* Check whether we need a TOC adjusting stub.
9558 Since the linker pastes together pieces from
9559 different object files when creating the
9560 _init and _fini functions, it may be that a
9561 call to what looks like a local sym is in
9562 fact a call needing a TOC adjustment. */
9563 if (code_sec != NULL
9564 && code_sec->output_section != NULL
9565 && (htab->stub_group[code_sec->id].toc_off
9566 != htab->stub_group[section->id].toc_off)
9567 && (code_sec->has_toc_reloc
9568 || code_sec->makes_toc_func_call))
9569 stub_type = ppc_stub_long_branch_r2off;
9570 }
9571
9572 if (stub_type == ppc_stub_none)
9573 continue;
9574
9575 /* __tls_get_addr calls might be eliminated. */
9576 if (stub_type != ppc_stub_plt_call
9577 && hash != NULL
9578 && (hash == htab->tls_get_addr
9579 || hash == htab->tls_get_addr_fd)
9580 && section->has_tls_reloc
9581 && irela != internal_relocs)
9582 {
9583 /* Get tls info. */
9584 char *tls_mask;
9585
9586 if (!get_tls_mask (&tls_mask, NULL, NULL, &local_syms,
9587 irela - 1, input_bfd))
9588 goto error_ret_free_internal;
9589 if (*tls_mask != 0)
9590 continue;
9591 }
9592
9593 /* Support for grouping stub sections. */
9594 id_sec = htab->stub_group[section->id].link_sec;
9595
9596 /* Get the name of this stub. */
9597 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela);
9598 if (!stub_name)
9599 goto error_ret_free_internal;
9600
9601 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
9602 stub_name, FALSE, FALSE);
9603 if (stub_entry != NULL)
9604 {
9605 /* The proper stub has already been created. */
9606 free (stub_name);
9607 continue;
9608 }
9609
9610 stub_entry = ppc_add_stub (stub_name, section, htab);
9611 if (stub_entry == NULL)
9612 {
9613 free (stub_name);
9614 error_ret_free_internal:
9615 if (elf_section_data (section)->relocs == NULL)
9616 free (internal_relocs);
9617 error_ret_free_local:
9618 if (local_syms != NULL
9619 && (symtab_hdr->contents
9620 != (unsigned char *) local_syms))
9621 free (local_syms);
9622 return FALSE;
9623 }
9624
9625 stub_entry->stub_type = stub_type;
9626 stub_entry->target_value = sym_value;
9627 stub_entry->target_section = code_sec;
9628 stub_entry->h = hash;
9629 stub_entry->addend = irela->r_addend;
9630
9631 if (stub_entry->h != NULL)
9632 htab->stub_globals += 1;
9633 }
9634
9635 /* We're done with the internal relocs, free them. */
9636 if (elf_section_data (section)->relocs != internal_relocs)
9637 free (internal_relocs);
9638 }
9639
9640 if (local_syms != NULL
9641 && symtab_hdr->contents != (unsigned char *) local_syms)
9642 {
9643 if (!info->keep_memory)
9644 free (local_syms);
9645 else
9646 symtab_hdr->contents = (unsigned char *) local_syms;
9647 }
9648 }
9649
9650 /* We may have added some stubs. Find out the new size of the
9651 stub sections. */
9652 for (stub_sec = htab->stub_bfd->sections;
9653 stub_sec != NULL;
9654 stub_sec = stub_sec->next)
9655 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
9656 {
9657 stub_sec->rawsize = stub_sec->size;
9658 stub_sec->size = 0;
9659 stub_sec->reloc_count = 0;
9660 stub_sec->flags &= ~SEC_RELOC;
9661 }
9662
9663 htab->brlt->size = 0;
9664 htab->brlt->reloc_count = 0;
9665 htab->brlt->flags &= ~SEC_RELOC;
9666 if (htab->relbrlt != NULL)
9667 htab->relbrlt->size = 0;
9668
9669 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info);
9670
9671 for (stub_sec = htab->stub_bfd->sections;
9672 stub_sec != NULL;
9673 stub_sec = stub_sec->next)
9674 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0
9675 && stub_sec->rawsize != stub_sec->size)
9676 break;
9677
9678 /* Exit from this loop when no stubs have been added, and no stubs
9679 have changed size. */
9680 if (stub_sec == NULL)
9681 break;
9682
9683 /* Ask the linker to do its stuff. */
9684 (*htab->layout_sections_again) ();
9685 }
9686
9687 /* It would be nice to strip htab->brlt from the output if the
9688 section is empty, but it's too late. If we strip sections here,
9689 the dynamic symbol table is corrupted since the section symbol
9690 for the stripped section isn't written. */
9691
9692 return TRUE;
9693 }
9694
9695 /* Called after we have determined section placement. If sections
9696 move, we'll be called again. Provide a value for TOCstart. */
9697
9698 bfd_vma
ppc64_elf_toc(bfd * obfd)9699 ppc64_elf_toc (bfd *obfd)
9700 {
9701 asection *s;
9702 bfd_vma TOCstart;
9703
9704 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that
9705 order. The TOC starts where the first of these sections starts. */
9706 s = bfd_get_section_by_name (obfd, ".got");
9707 if (s == NULL)
9708 s = bfd_get_section_by_name (obfd, ".toc");
9709 if (s == NULL)
9710 s = bfd_get_section_by_name (obfd, ".tocbss");
9711 if (s == NULL)
9712 s = bfd_get_section_by_name (obfd, ".plt");
9713 if (s == NULL)
9714 {
9715 /* This may happen for
9716 o references to TOC base (SYM@toc / TOC[tc0]) without a
9717 .toc directive
9718 o bad linker script
9719 o --gc-sections and empty TOC sections
9720
9721 FIXME: Warn user? */
9722
9723 /* Look for a likely section. We probably won't even be
9724 using TOCstart. */
9725 for (s = obfd->sections; s != NULL; s = s->next)
9726 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY))
9727 == (SEC_ALLOC | SEC_SMALL_DATA))
9728 break;
9729 if (s == NULL)
9730 for (s = obfd->sections; s != NULL; s = s->next)
9731 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA))
9732 == (SEC_ALLOC | SEC_SMALL_DATA))
9733 break;
9734 if (s == NULL)
9735 for (s = obfd->sections; s != NULL; s = s->next)
9736 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
9737 break;
9738 if (s == NULL)
9739 for (s = obfd->sections; s != NULL; s = s->next)
9740 if ((s->flags & SEC_ALLOC) == SEC_ALLOC)
9741 break;
9742 }
9743
9744 TOCstart = 0;
9745 if (s != NULL)
9746 TOCstart = s->output_section->vma + s->output_offset;
9747
9748 return TOCstart;
9749 }
9750
9751 /* Build all the stubs associated with the current output file.
9752 The stubs are kept in a hash table attached to the main linker
9753 hash table. This function is called via gldelf64ppc_finish. */
9754
9755 bfd_boolean
ppc64_elf_build_stubs(bfd_boolean emit_stub_syms,struct bfd_link_info * info,char ** stats)9756 ppc64_elf_build_stubs (bfd_boolean emit_stub_syms,
9757 struct bfd_link_info *info,
9758 char **stats)
9759 {
9760 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9761 asection *stub_sec;
9762 bfd_byte *p;
9763 int stub_sec_count = 0;
9764
9765 htab->emit_stub_syms = emit_stub_syms;
9766
9767 /* Allocate memory to hold the linker stubs. */
9768 for (stub_sec = htab->stub_bfd->sections;
9769 stub_sec != NULL;
9770 stub_sec = stub_sec->next)
9771 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0
9772 && stub_sec->size != 0)
9773 {
9774 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size);
9775 if (stub_sec->contents == NULL)
9776 return FALSE;
9777 /* We want to check that built size is the same as calculated
9778 size. rawsize is a convenient location to use. */
9779 stub_sec->rawsize = stub_sec->size;
9780 stub_sec->size = 0;
9781 }
9782
9783 if (htab->glink != NULL && htab->glink->size != 0)
9784 {
9785 unsigned int indx;
9786 bfd_vma plt0;
9787
9788 /* Build the .glink plt call stub. */
9789 if (htab->emit_stub_syms)
9790 {
9791 struct elf_link_hash_entry *h;
9792 h = elf_link_hash_lookup (&htab->elf, "__glink", TRUE, FALSE, FALSE);
9793 if (h == NULL)
9794 return FALSE;
9795 if (h->root.type == bfd_link_hash_new)
9796 {
9797 h->root.type = bfd_link_hash_defined;
9798 h->root.u.def.section = htab->glink;
9799 h->root.u.def.value = 8;
9800 h->ref_regular = 1;
9801 h->def_regular = 1;
9802 h->ref_regular_nonweak = 1;
9803 h->forced_local = 1;
9804 h->non_elf = 0;
9805 }
9806 }
9807 p = htab->glink->contents;
9808 plt0 = (htab->plt->output_section->vma
9809 + htab->plt->output_offset
9810 - (htab->glink->output_section->vma
9811 + htab->glink->output_offset
9812 + 16));
9813 bfd_put_64 (htab->glink->owner, plt0, p);
9814 p += 8;
9815 bfd_put_32 (htab->glink->owner, MFLR_R12, p);
9816 p += 4;
9817 bfd_put_32 (htab->glink->owner, BCL_20_31, p);
9818 p += 4;
9819 bfd_put_32 (htab->glink->owner, MFLR_R11, p);
9820 p += 4;
9821 bfd_put_32 (htab->glink->owner, LD_R2_M16R11, p);
9822 p += 4;
9823 bfd_put_32 (htab->glink->owner, MTLR_R12, p);
9824 p += 4;
9825 bfd_put_32 (htab->glink->owner, ADD_R12_R2_R11, p);
9826 p += 4;
9827 bfd_put_32 (htab->glink->owner, LD_R11_0R12, p);
9828 p += 4;
9829 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p);
9830 p += 4;
9831 bfd_put_32 (htab->glink->owner, MTCTR_R11, p);
9832 p += 4;
9833 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p);
9834 p += 4;
9835 bfd_put_32 (htab->glink->owner, BCTR, p);
9836 p += 4;
9837 while (p - htab->glink->contents < GLINK_CALL_STUB_SIZE)
9838 {
9839 bfd_put_32 (htab->glink->owner, NOP, p);
9840 p += 4;
9841 }
9842
9843 /* Build the .glink lazy link call stubs. */
9844 indx = 0;
9845 while (p < htab->glink->contents + htab->glink->size)
9846 {
9847 if (indx < 0x8000)
9848 {
9849 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p);
9850 p += 4;
9851 }
9852 else
9853 {
9854 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p);
9855 p += 4;
9856 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p);
9857 p += 4;
9858 }
9859 bfd_put_32 (htab->glink->owner,
9860 B_DOT | ((htab->glink->contents - p + 8) & 0x3fffffc), p);
9861 indx++;
9862 p += 4;
9863 }
9864 htab->glink->rawsize = p - htab->glink->contents;
9865 }
9866
9867 if (htab->brlt->size != 0)
9868 {
9869 htab->brlt->contents = bfd_zalloc (htab->brlt->owner,
9870 htab->brlt->size);
9871 if (htab->brlt->contents == NULL)
9872 return FALSE;
9873 }
9874 if (htab->relbrlt != NULL && htab->relbrlt->size != 0)
9875 {
9876 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner,
9877 htab->relbrlt->size);
9878 if (htab->relbrlt->contents == NULL)
9879 return FALSE;
9880 }
9881
9882 /* Build the stubs as directed by the stub hash table. */
9883 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info);
9884
9885 if (htab->relbrlt != NULL)
9886 htab->relbrlt->reloc_count = 0;
9887
9888 for (stub_sec = htab->stub_bfd->sections;
9889 stub_sec != NULL;
9890 stub_sec = stub_sec->next)
9891 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
9892 {
9893 stub_sec_count += 1;
9894 if (stub_sec->rawsize != stub_sec->size)
9895 break;
9896 }
9897
9898 if (stub_sec != NULL
9899 || htab->glink->rawsize != htab->glink->size)
9900 {
9901 htab->stub_error = TRUE;
9902 (*_bfd_error_handler) (_("stubs don't match calculated size"));
9903 }
9904
9905 if (htab->stub_error)
9906 return FALSE;
9907
9908 if (stats != NULL)
9909 {
9910 *stats = bfd_malloc (500);
9911 if (*stats == NULL)
9912 return FALSE;
9913
9914 sprintf (*stats, _("linker stubs in %u group%s\n"
9915 " branch %lu\n"
9916 " toc adjust %lu\n"
9917 " long branch %lu\n"
9918 " long toc adj %lu\n"
9919 " plt call %lu"),
9920 stub_sec_count,
9921 stub_sec_count == 1 ? "" : "s",
9922 htab->stub_count[ppc_stub_long_branch - 1],
9923 htab->stub_count[ppc_stub_long_branch_r2off - 1],
9924 htab->stub_count[ppc_stub_plt_branch - 1],
9925 htab->stub_count[ppc_stub_plt_branch_r2off - 1],
9926 htab->stub_count[ppc_stub_plt_call - 1]);
9927 }
9928 return TRUE;
9929 }
9930
9931 /* This function undoes the changes made by add_symbol_adjust. */
9932
9933 static bfd_boolean
undo_symbol_twiddle(struct elf_link_hash_entry * h,void * inf ATTRIBUTE_UNUSED)9934 undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
9935 {
9936 struct ppc_link_hash_entry *eh;
9937
9938 if (h->root.type == bfd_link_hash_indirect)
9939 return TRUE;
9940
9941 if (h->root.type == bfd_link_hash_warning)
9942 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9943
9944 eh = (struct ppc_link_hash_entry *) h;
9945 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined)
9946 return TRUE;
9947
9948 eh->elf.root.type = bfd_link_hash_undefined;
9949 return TRUE;
9950 }
9951
9952 void
ppc64_elf_restore_symbols(struct bfd_link_info * info)9953 ppc64_elf_restore_symbols (struct bfd_link_info *info)
9954 {
9955 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9956 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info);
9957 }
9958
9959 /* What to do when ld finds relocations against symbols defined in
9960 discarded sections. */
9961
9962 static unsigned int
ppc64_elf_action_discarded(asection * sec)9963 ppc64_elf_action_discarded (asection *sec)
9964 {
9965 if (strcmp (".opd", sec->name) == 0)
9966 return 0;
9967
9968 if (strcmp (".toc", sec->name) == 0)
9969 return 0;
9970
9971 if (strcmp (".toc1", sec->name) == 0)
9972 return 0;
9973
9974 if (sec->flags & SEC_RELOC)
9975 return 0;
9976
9977 return _bfd_elf_default_action_discarded (sec);
9978 }
9979
9980 /* The RELOCATE_SECTION function is called by the ELF backend linker
9981 to handle the relocations for a section.
9982
9983 The relocs are always passed as Rela structures; if the section
9984 actually uses Rel structures, the r_addend field will always be
9985 zero.
9986
9987 This function is responsible for adjust the section contents as
9988 necessary, and (if using Rela relocs and generating a
9989 relocatable output file) adjusting the reloc addend as
9990 necessary.
9991
9992 This function does not have to worry about setting the reloc
9993 address or the reloc symbol index.
9994
9995 LOCAL_SYMS is a pointer to the swapped in local symbols.
9996
9997 LOCAL_SECTIONS is an array giving the section in the input file
9998 corresponding to the st_shndx field of each local symbol.
9999
10000 The global hash table entry for the global symbols can be found
10001 via elf_sym_hashes (input_bfd).
10002
10003 When generating relocatable output, this function must handle
10004 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
10005 going to be the section symbol corresponding to the output
10006 section, which means that the addend must be adjusted
10007 accordingly. */
10008
10009 static bfd_boolean
ppc64_elf_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)10010 ppc64_elf_relocate_section (bfd *output_bfd,
10011 struct bfd_link_info *info,
10012 bfd *input_bfd,
10013 asection *input_section,
10014 bfd_byte *contents,
10015 Elf_Internal_Rela *relocs,
10016 Elf_Internal_Sym *local_syms,
10017 asection **local_sections)
10018 {
10019 struct ppc_link_hash_table *htab;
10020 Elf_Internal_Shdr *symtab_hdr;
10021 struct elf_link_hash_entry **sym_hashes;
10022 Elf_Internal_Rela *rel;
10023 Elf_Internal_Rela *relend;
10024 Elf_Internal_Rela outrel;
10025 bfd_byte *loc;
10026 struct got_entry **local_got_ents;
10027 bfd_vma TOCstart;
10028 bfd_boolean ret = TRUE;
10029 bfd_boolean is_opd;
10030 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
10031 bfd_boolean is_power4 = FALSE;
10032 bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0);
10033
10034 /* Initialize howto table if needed. */
10035 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
10036 ppc_howto_init ();
10037
10038 htab = ppc_hash_table (info);
10039
10040 /* Don't relocate stub sections. */
10041 if (input_section->owner == htab->stub_bfd)
10042 return TRUE;
10043
10044 local_got_ents = elf_local_got_ents (input_bfd);
10045 TOCstart = elf_gp (output_bfd);
10046 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
10047 sym_hashes = elf_sym_hashes (input_bfd);
10048 is_opd = ppc64_elf_section_data (input_section)->sec_type == sec_opd;
10049
10050 rel = relocs;
10051 relend = relocs + input_section->reloc_count;
10052 for (; rel < relend; rel++)
10053 {
10054 enum elf_ppc64_reloc_type r_type;
10055 bfd_vma addend, orig_addend;
10056 bfd_reloc_status_type r;
10057 Elf_Internal_Sym *sym;
10058 asection *sec;
10059 struct elf_link_hash_entry *h_elf;
10060 struct ppc_link_hash_entry *h;
10061 struct ppc_link_hash_entry *fdh;
10062 const char *sym_name;
10063 unsigned long r_symndx, toc_symndx;
10064 bfd_vma toc_addend;
10065 char tls_mask, tls_gd, tls_type;
10066 char sym_type;
10067 bfd_vma relocation;
10068 bfd_boolean unresolved_reloc;
10069 bfd_boolean warned;
10070 unsigned long insn, mask;
10071 struct ppc_stub_hash_entry *stub_entry;
10072 bfd_vma max_br_offset;
10073 bfd_vma from;
10074
10075 r_type = ELF64_R_TYPE (rel->r_info);
10076 r_symndx = ELF64_R_SYM (rel->r_info);
10077
10078 /* For old style R_PPC64_TOC relocs with a zero symbol, use the
10079 symbol of the previous ADDR64 reloc. The symbol gives us the
10080 proper TOC base to use. */
10081 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC)
10082 && rel != relocs
10083 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64
10084 && is_opd)
10085 r_symndx = ELF64_R_SYM (rel[-1].r_info);
10086
10087 sym = NULL;
10088 sec = NULL;
10089 h_elf = NULL;
10090 sym_name = NULL;
10091 unresolved_reloc = FALSE;
10092 warned = FALSE;
10093 orig_addend = rel->r_addend;
10094
10095 if (r_symndx < symtab_hdr->sh_info)
10096 {
10097 /* It's a local symbol. */
10098 long *opd_adjust;
10099
10100 sym = local_syms + r_symndx;
10101 sec = local_sections[r_symndx];
10102 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec);
10103 sym_type = ELF64_ST_TYPE (sym->st_info);
10104 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
10105 opd_adjust = get_opd_info (sec);
10106 if (opd_adjust != NULL)
10107 {
10108 long adjust = opd_adjust[(sym->st_value + rel->r_addend) / 8];
10109 if (adjust == -1)
10110 relocation = 0;
10111 else
10112 {
10113 /* If this is a relocation against the opd section sym
10114 and we have edited .opd, adjust the reloc addend so
10115 that ld -r and ld --emit-relocs output is correct.
10116 If it is a reloc against some other .opd symbol,
10117 then the symbol value will be adjusted later. */
10118 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
10119 rel->r_addend += adjust;
10120 else
10121 relocation += adjust;
10122 }
10123 }
10124 }
10125 else
10126 {
10127 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
10128 r_symndx, symtab_hdr, sym_hashes,
10129 h_elf, sec, relocation,
10130 unresolved_reloc, warned);
10131 sym_name = h_elf->root.root.string;
10132 sym_type = h_elf->type;
10133 }
10134 h = (struct ppc_link_hash_entry *) h_elf;
10135
10136 if (sec != NULL && elf_discarded_section (sec))
10137 {
10138 /* For relocs against symbols from removed linkonce sections,
10139 or sections discarded by a linker script, we just want the
10140 section contents zeroed. Avoid any special processing. */
10141 _bfd_clear_contents (ppc64_elf_howto_table[r_type], input_bfd,
10142 contents + rel->r_offset);
10143 rel->r_info = 0;
10144 rel->r_addend = 0;
10145 continue;
10146 }
10147
10148 if (info->relocatable)
10149 continue;
10150
10151 /* TLS optimizations. Replace instruction sequences and relocs
10152 based on information we collected in tls_optimize. We edit
10153 RELOCS so that --emit-relocs will output something sensible
10154 for the final instruction stream. */
10155 tls_mask = 0;
10156 tls_gd = 0;
10157 toc_symndx = 0;
10158 if (h != NULL)
10159 tls_mask = h->tls_mask;
10160 else if (local_got_ents != NULL)
10161 {
10162 char *lgot_masks;
10163 lgot_masks = (char *) (local_got_ents + symtab_hdr->sh_info);
10164 tls_mask = lgot_masks[r_symndx];
10165 }
10166 if (tls_mask == 0
10167 && (r_type == R_PPC64_TLS
10168 || r_type == R_PPC64_TLSGD
10169 || r_type == R_PPC64_TLSLD))
10170 {
10171 /* Check for toc tls entries. */
10172 char *toc_tls;
10173
10174 if (!get_tls_mask (&toc_tls, &toc_symndx, &toc_addend,
10175 &local_syms, rel, input_bfd))
10176 return FALSE;
10177
10178 if (toc_tls)
10179 tls_mask = *toc_tls;
10180 }
10181
10182 /* Check that tls relocs are used with tls syms, and non-tls
10183 relocs are used with non-tls syms. */
10184 if (r_symndx != 0
10185 && r_type != R_PPC64_NONE
10186 && (h == NULL
10187 || h->elf.root.type == bfd_link_hash_defined
10188 || h->elf.root.type == bfd_link_hash_defweak)
10189 && (IS_PPC64_TLS_RELOC (r_type)
10190 != (sym_type == STT_TLS
10191 || (sym_type == STT_SECTION
10192 && (sec->flags & SEC_THREAD_LOCAL) != 0))))
10193 {
10194 if (tls_mask != 0
10195 && (r_type == R_PPC64_TLS
10196 || r_type == R_PPC64_TLSGD
10197 || r_type == R_PPC64_TLSLD))
10198 /* R_PPC64_TLS is OK against a symbol in the TOC. */
10199 ;
10200 else
10201 (*_bfd_error_handler)
10202 (!IS_PPC64_TLS_RELOC (r_type)
10203 ? _("%B(%A+0x%lx): %s used with TLS symbol %s")
10204 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s"),
10205 input_bfd,
10206 input_section,
10207 (long) rel->r_offset,
10208 ppc64_elf_howto_table[r_type]->name,
10209 sym_name);
10210 }
10211
10212 /* Ensure reloc mapping code below stays sane. */
10213 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1
10214 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1
10215 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3)
10216 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3)
10217 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3)
10218 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3)
10219 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3)
10220 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3)
10221 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3)
10222 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3))
10223 abort ();
10224
10225 switch (r_type)
10226 {
10227 default:
10228 break;
10229
10230 case R_PPC64_TOC16:
10231 case R_PPC64_TOC16_LO:
10232 case R_PPC64_TOC16_DS:
10233 case R_PPC64_TOC16_LO_DS:
10234 {
10235 /* Check for toc tls entries. */
10236 char *toc_tls;
10237 int retval;
10238
10239 retval = get_tls_mask (&toc_tls, &toc_symndx, &toc_addend,
10240 &local_syms, rel, input_bfd);
10241 if (retval == 0)
10242 return FALSE;
10243
10244 if (toc_tls)
10245 {
10246 tls_mask = *toc_tls;
10247 if (r_type == R_PPC64_TOC16_DS
10248 || r_type == R_PPC64_TOC16_LO_DS)
10249 {
10250 if (tls_mask != 0
10251 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0)
10252 goto toctprel;
10253 }
10254 else
10255 {
10256 /* If we found a GD reloc pair, then we might be
10257 doing a GD->IE transition. */
10258 if (retval == 2)
10259 {
10260 tls_gd = TLS_TPRELGD;
10261 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
10262 goto tls_ldgd_opt;
10263 }
10264 else if (retval == 3)
10265 {
10266 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
10267 goto tls_ldgd_opt;
10268 }
10269 }
10270 }
10271 }
10272 break;
10273
10274 case R_PPC64_GOT_TPREL16_DS:
10275 case R_PPC64_GOT_TPREL16_LO_DS:
10276 if (tls_mask != 0
10277 && (tls_mask & TLS_TPREL) == 0)
10278 {
10279 toctprel:
10280 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset);
10281 insn &= 31 << 21;
10282 insn |= 0x3c0d0000; /* addis 0,13,0 */
10283 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset);
10284 r_type = R_PPC64_TPREL16_HA;
10285 if (toc_symndx != 0)
10286 {
10287 rel->r_info = ELF64_R_INFO (toc_symndx, r_type);
10288 /* We changed the symbol. Start over in order to
10289 get h, sym, sec etc. right. */
10290 rel--;
10291 continue;
10292 }
10293 else
10294 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10295 }
10296 break;
10297
10298 case R_PPC64_TLS:
10299 if (tls_mask != 0
10300 && (tls_mask & TLS_TPREL) == 0)
10301 {
10302 bfd_vma rtra;
10303 insn = bfd_get_32 (output_bfd, contents + rel->r_offset);
10304 if ((insn & ((0x3f << 26) | (31 << 11)))
10305 == ((31 << 26) | (13 << 11)))
10306 rtra = insn & ((1 << 26) - (1 << 16));
10307 else if ((insn & ((0x3f << 26) | (31 << 16)))
10308 == ((31 << 26) | (13 << 16)))
10309 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5);
10310 else
10311 abort ();
10312 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1)
10313 /* add -> addi. */
10314 insn = 14 << 26;
10315 else if ((insn & (31 << 1)) == 23 << 1
10316 && ((insn & (31 << 6)) < 14 << 6
10317 || ((insn & (31 << 6)) >= 16 << 6
10318 && (insn & (31 << 6)) < 24 << 6)))
10319 /* load and store indexed -> dform. */
10320 insn = (32 | ((insn >> 6) & 31)) << 26;
10321 else if ((insn & (31 << 1)) == 21 << 1
10322 && (insn & (0x1a << 6)) == 0)
10323 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
10324 insn = (((58 | ((insn >> 6) & 4)) << 26)
10325 | ((insn >> 6) & 1));
10326 else if ((insn & (31 << 1)) == 21 << 1
10327 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1)
10328 /* lwax -> lwa. */
10329 insn = (58 << 26) | 2;
10330 else
10331 abort ();
10332 insn |= rtra;
10333 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
10334 /* Was PPC64_TLS which sits on insn boundary, now
10335 PPC64_TPREL16_LO which is at low-order half-word. */
10336 rel->r_offset += d_offset;
10337 r_type = R_PPC64_TPREL16_LO;
10338 if (toc_symndx != 0)
10339 {
10340 rel->r_info = ELF64_R_INFO (toc_symndx, r_type);
10341 rel->r_addend = toc_addend;
10342 rel->r_addend = toc_addend;
10343 /* We changed the symbol. Start over in order to
10344 get h, sym, sec etc. right. */
10345 rel--;
10346 continue;
10347 }
10348 else
10349 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10350 }
10351 break;
10352
10353 case R_PPC64_GOT_TLSGD16_HI:
10354 case R_PPC64_GOT_TLSGD16_HA:
10355 tls_gd = TLS_TPRELGD;
10356 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
10357 goto tls_gdld_hi;
10358 break;
10359
10360 case R_PPC64_GOT_TLSLD16_HI:
10361 case R_PPC64_GOT_TLSLD16_HA:
10362 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
10363 {
10364 tls_gdld_hi:
10365 if ((tls_mask & tls_gd) != 0)
10366 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3)
10367 + R_PPC64_GOT_TPREL16_DS);
10368 else
10369 {
10370 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset);
10371 rel->r_offset -= d_offset;
10372 r_type = R_PPC64_NONE;
10373 }
10374 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10375 }
10376 break;
10377
10378 case R_PPC64_GOT_TLSGD16:
10379 case R_PPC64_GOT_TLSGD16_LO:
10380 tls_gd = TLS_TPRELGD;
10381 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
10382 goto tls_ldgd_opt;
10383 break;
10384
10385 case R_PPC64_GOT_TLSLD16:
10386 case R_PPC64_GOT_TLSLD16_LO:
10387 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
10388 {
10389 unsigned int insn1, insn2, insn3;
10390 bfd_vma offset;
10391
10392 tls_ldgd_opt:
10393 offset = (bfd_vma) -1;
10394 /* If not using the newer R_PPC64_TLSGD/LD to mark
10395 __tls_get_addr calls, we must trust that the call
10396 stays with its arg setup insns, ie. that the next
10397 reloc is the __tls_get_addr call associated with
10398 the current reloc. Edit both insns. */
10399 if (input_section->has_tls_get_addr_call
10400 && rel + 1 < relend
10401 && branch_reloc_hash_match (input_bfd, rel + 1,
10402 htab->tls_get_addr,
10403 htab->tls_get_addr_fd))
10404 offset = rel[1].r_offset;
10405 if ((tls_mask & tls_gd) != 0)
10406 {
10407 /* IE */
10408 insn1 = bfd_get_32 (output_bfd,
10409 contents + rel->r_offset - d_offset);
10410 insn1 &= (1 << 26) - (1 << 2);
10411 insn1 |= 58 << 26; /* ld */
10412 insn2 = 0x7c636a14; /* add 3,3,13 */
10413 if (offset != (bfd_vma) -1)
10414 rel[1].r_info = ELF64_R_INFO (ELF64_R_SYM (rel[1].r_info),
10415 R_PPC64_NONE);
10416 if ((tls_mask & TLS_EXPLICIT) == 0)
10417 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3)
10418 + R_PPC64_GOT_TPREL16_DS);
10419 else
10420 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16;
10421 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10422 }
10423 else
10424 {
10425 /* LE */
10426 insn1 = 0x3c6d0000; /* addis 3,13,0 */
10427 insn2 = 0x38630000; /* addi 3,3,0 */
10428 if (tls_gd == 0)
10429 {
10430 /* Was an LD reloc. */
10431 if (toc_symndx)
10432 sec = local_sections[toc_symndx];
10433 for (r_symndx = 0;
10434 r_symndx < symtab_hdr->sh_info;
10435 r_symndx++)
10436 if (local_sections[r_symndx] == sec)
10437 break;
10438 if (r_symndx >= symtab_hdr->sh_info)
10439 r_symndx = 0;
10440 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET;
10441 if (r_symndx != 0)
10442 rel->r_addend -= (local_syms[r_symndx].st_value
10443 + sec->output_offset
10444 + sec->output_section->vma);
10445 }
10446 else if (toc_symndx != 0)
10447 {
10448 r_symndx = toc_symndx;
10449 rel->r_addend = toc_addend;
10450 }
10451 r_type = R_PPC64_TPREL16_HA;
10452 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10453 if (offset != (bfd_vma) -1)
10454 {
10455 rel[1].r_info = ELF64_R_INFO (r_symndx,
10456 R_PPC64_TPREL16_LO);
10457 rel[1].r_offset = offset + d_offset;
10458 rel[1].r_addend = rel->r_addend;
10459 }
10460 }
10461 bfd_put_32 (output_bfd, insn1,
10462 contents + rel->r_offset - d_offset);
10463 if (offset != (bfd_vma) -1)
10464 {
10465 insn3 = bfd_get_32 (output_bfd,
10466 contents + offset + 4);
10467 if (insn3 == NOP
10468 || insn3 == CROR_151515 || insn3 == CROR_313131)
10469 {
10470 rel[1].r_offset += 4;
10471 bfd_put_32 (output_bfd, insn2, contents + offset + 4);
10472 insn2 = NOP;
10473 }
10474 bfd_put_32 (output_bfd, insn2, contents + offset);
10475 }
10476 if ((tls_mask & tls_gd) == 0
10477 && (tls_gd == 0 || toc_symndx != 0))
10478 {
10479 /* We changed the symbol. Start over in order
10480 to get h, sym, sec etc. right. */
10481 rel--;
10482 continue;
10483 }
10484 }
10485 break;
10486
10487 case R_PPC64_TLSGD:
10488 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
10489 {
10490 unsigned int insn2, insn3;
10491 bfd_vma offset = rel->r_offset;
10492
10493 if ((tls_mask & TLS_TPRELGD) != 0)
10494 {
10495 /* IE */
10496 r_type = R_PPC64_NONE;
10497 insn2 = 0x7c636a14; /* add 3,3,13 */
10498 }
10499 else
10500 {
10501 /* LE */
10502 if (toc_symndx != 0)
10503 {
10504 r_symndx = toc_symndx;
10505 rel->r_addend = toc_addend;
10506 }
10507 r_type = R_PPC64_TPREL16_LO;
10508 rel->r_offset = offset + d_offset;
10509 insn2 = 0x38630000; /* addi 3,3,0 */
10510 }
10511 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10512 /* Zap the reloc on the _tls_get_addr call too. */
10513 BFD_ASSERT (offset == rel[1].r_offset);
10514 rel[1].r_info = ELF64_R_INFO (ELF64_R_SYM (rel[1].r_info),
10515 R_PPC64_NONE);
10516 insn3 = bfd_get_32 (output_bfd,
10517 contents + offset + 4);
10518 if (insn3 == NOP
10519 || insn3 == CROR_151515 || insn3 == CROR_313131)
10520 {
10521 rel->r_offset += 4;
10522 bfd_put_32 (output_bfd, insn2, contents + offset + 4);
10523 insn2 = NOP;
10524 }
10525 bfd_put_32 (output_bfd, insn2, contents + offset);
10526 if ((tls_mask & TLS_TPRELGD) == 0 && toc_symndx != 0)
10527 {
10528 rel--;
10529 continue;
10530 }
10531 }
10532 break;
10533
10534 case R_PPC64_TLSLD:
10535 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
10536 {
10537 unsigned int insn2, insn3;
10538 bfd_vma offset = rel->r_offset;
10539
10540 if (toc_symndx)
10541 sec = local_sections[toc_symndx];
10542 for (r_symndx = 0;
10543 r_symndx < symtab_hdr->sh_info;
10544 r_symndx++)
10545 if (local_sections[r_symndx] == sec)
10546 break;
10547 if (r_symndx >= symtab_hdr->sh_info)
10548 r_symndx = 0;
10549 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET;
10550 if (r_symndx != 0)
10551 rel->r_addend -= (local_syms[r_symndx].st_value
10552 + sec->output_offset
10553 + sec->output_section->vma);
10554
10555 r_type = R_PPC64_TPREL16_LO;
10556 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10557 rel->r_offset = offset + d_offset;
10558 /* Zap the reloc on the _tls_get_addr call too. */
10559 BFD_ASSERT (offset == rel[1].r_offset);
10560 rel[1].r_info = ELF64_R_INFO (ELF64_R_SYM (rel[1].r_info),
10561 R_PPC64_NONE);
10562 insn2 = 0x38630000; /* addi 3,3,0 */
10563 insn3 = bfd_get_32 (output_bfd,
10564 contents + offset + 4);
10565 if (insn3 == NOP
10566 || insn3 == CROR_151515 || insn3 == CROR_313131)
10567 {
10568 rel->r_offset += 4;
10569 bfd_put_32 (output_bfd, insn2, contents + offset + 4);
10570 insn2 = NOP;
10571 }
10572 bfd_put_32 (output_bfd, insn2, contents + offset);
10573 rel--;
10574 continue;
10575 }
10576 break;
10577
10578 case R_PPC64_DTPMOD64:
10579 if (rel + 1 < relend
10580 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)
10581 && rel[1].r_offset == rel->r_offset + 8)
10582 {
10583 if ((tls_mask & TLS_GD) == 0)
10584 {
10585 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE);
10586 if ((tls_mask & TLS_TPRELGD) != 0)
10587 r_type = R_PPC64_TPREL64;
10588 else
10589 {
10590 bfd_put_64 (output_bfd, 1, contents + rel->r_offset);
10591 r_type = R_PPC64_NONE;
10592 }
10593 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10594 }
10595 }
10596 else
10597 {
10598 if ((tls_mask & TLS_LD) == 0)
10599 {
10600 bfd_put_64 (output_bfd, 1, contents + rel->r_offset);
10601 r_type = R_PPC64_NONE;
10602 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10603 }
10604 }
10605 break;
10606
10607 case R_PPC64_TPREL64:
10608 if ((tls_mask & TLS_TPREL) == 0)
10609 {
10610 r_type = R_PPC64_NONE;
10611 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
10612 }
10613 break;
10614 }
10615
10616 /* Handle other relocations that tweak non-addend part of insn. */
10617 insn = 0;
10618 max_br_offset = 1 << 25;
10619 addend = rel->r_addend;
10620 switch (r_type)
10621 {
10622 default:
10623 break;
10624
10625 /* Branch taken prediction relocations. */
10626 case R_PPC64_ADDR14_BRTAKEN:
10627 case R_PPC64_REL14_BRTAKEN:
10628 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
10629 /* Fall thru. */
10630
10631 /* Branch not taken prediction relocations. */
10632 case R_PPC64_ADDR14_BRNTAKEN:
10633 case R_PPC64_REL14_BRNTAKEN:
10634 insn |= bfd_get_32 (output_bfd,
10635 contents + rel->r_offset) & ~(0x01 << 21);
10636 /* Fall thru. */
10637
10638 case R_PPC64_REL14:
10639 max_br_offset = 1 << 15;
10640 /* Fall thru. */
10641
10642 case R_PPC64_REL24:
10643 /* Calls to functions with a different TOC, such as calls to
10644 shared objects, need to alter the TOC pointer. This is
10645 done using a linkage stub. A REL24 branching to these
10646 linkage stubs needs to be followed by a nop, as the nop
10647 will be replaced with an instruction to restore the TOC
10648 base pointer. */
10649 stub_entry = NULL;
10650 fdh = h;
10651 if (((h != NULL
10652 && (((fdh = h->oh) != NULL
10653 && fdh->elf.plt.plist != NULL)
10654 || (fdh = h)->elf.plt.plist != NULL))
10655 || (sec != NULL
10656 && sec->output_section != NULL
10657 && sec->id <= htab->top_id
10658 && (htab->stub_group[sec->id].toc_off
10659 != htab->stub_group[input_section->id].toc_off)))
10660 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh,
10661 rel, htab)) != NULL
10662 && (stub_entry->stub_type == ppc_stub_plt_call
10663 || stub_entry->stub_type == ppc_stub_plt_branch_r2off
10664 || stub_entry->stub_type == ppc_stub_long_branch_r2off))
10665 {
10666 bfd_boolean can_plt_call = FALSE;
10667
10668 if (rel->r_offset + 8 <= input_section->size)
10669 {
10670 unsigned long nop;
10671 nop = bfd_get_32 (input_bfd, contents + rel->r_offset + 4);
10672 if (nop == NOP
10673 || nop == CROR_151515 || nop == CROR_313131)
10674 {
10675 bfd_put_32 (input_bfd, LD_R2_40R1,
10676 contents + rel->r_offset + 4);
10677 can_plt_call = TRUE;
10678 }
10679 }
10680
10681 if (!can_plt_call)
10682 {
10683 if (stub_entry->stub_type == ppc_stub_plt_call)
10684 {
10685 /* If this is a plain branch rather than a branch
10686 and link, don't require a nop. However, don't
10687 allow tail calls in a shared library as they
10688 will result in r2 being corrupted. */
10689 unsigned long br;
10690 br = bfd_get_32 (input_bfd, contents + rel->r_offset);
10691 if (info->executable && (br & 1) == 0)
10692 can_plt_call = TRUE;
10693 else
10694 stub_entry = NULL;
10695 }
10696 else if (h != NULL
10697 && strcmp (h->elf.root.root.string,
10698 ".__libc_start_main") == 0)
10699 {
10700 /* Allow crt1 branch to go via a toc adjusting stub. */
10701 can_plt_call = TRUE;
10702 }
10703 else
10704 {
10705 if (strcmp (input_section->output_section->name,
10706 ".init") == 0
10707 || strcmp (input_section->output_section->name,
10708 ".fini") == 0)
10709 (*_bfd_error_handler)
10710 (_("%B(%A+0x%lx): automatic multiple TOCs "
10711 "not supported using your crt files; "
10712 "recompile with -mminimal-toc or upgrade gcc"),
10713 input_bfd,
10714 input_section,
10715 (long) rel->r_offset);
10716 else
10717 (*_bfd_error_handler)
10718 (_("%B(%A+0x%lx): sibling call optimization to `%s' "
10719 "does not allow automatic multiple TOCs; "
10720 "recompile with -mminimal-toc or "
10721 "-fno-optimize-sibling-calls, "
10722 "or make `%s' extern"),
10723 input_bfd,
10724 input_section,
10725 (long) rel->r_offset,
10726 sym_name,
10727 sym_name);
10728 bfd_set_error (bfd_error_bad_value);
10729 ret = FALSE;
10730 }
10731 }
10732
10733 if (can_plt_call
10734 && stub_entry->stub_type == ppc_stub_plt_call)
10735 unresolved_reloc = FALSE;
10736 }
10737
10738 if (stub_entry == NULL
10739 && get_opd_info (sec) != NULL)
10740 {
10741 /* The branch destination is the value of the opd entry. */
10742 bfd_vma off = (relocation + addend
10743 - sec->output_section->vma
10744 - sec->output_offset);
10745 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL);
10746 if (dest != (bfd_vma) -1)
10747 {
10748 relocation = dest;
10749 addend = 0;
10750 }
10751 }
10752
10753 /* If the branch is out of reach we ought to have a long
10754 branch stub. */
10755 from = (rel->r_offset
10756 + input_section->output_offset
10757 + input_section->output_section->vma);
10758
10759 if (stub_entry == NULL
10760 && (relocation + addend - from + max_br_offset
10761 >= 2 * max_br_offset)
10762 && r_type != R_PPC64_ADDR14_BRTAKEN
10763 && r_type != R_PPC64_ADDR14_BRNTAKEN)
10764 stub_entry = ppc_get_stub_entry (input_section, sec, h, rel,
10765 htab);
10766
10767 if (stub_entry != NULL)
10768 {
10769 /* Munge up the value and addend so that we call the stub
10770 rather than the procedure directly. */
10771 relocation = (stub_entry->stub_offset
10772 + stub_entry->stub_sec->output_offset
10773 + stub_entry->stub_sec->output_section->vma);
10774 addend = 0;
10775 }
10776
10777 if (insn != 0)
10778 {
10779 if (is_power4)
10780 {
10781 /* Set 'a' bit. This is 0b00010 in BO field for branch
10782 on CR(BI) insns (BO == 001at or 011at), and 0b01000
10783 for branch on CTR insns (BO == 1a00t or 1a01t). */
10784 if ((insn & (0x14 << 21)) == (0x04 << 21))
10785 insn |= 0x02 << 21;
10786 else if ((insn & (0x14 << 21)) == (0x10 << 21))
10787 insn |= 0x08 << 21;
10788 else
10789 break;
10790 }
10791 else
10792 {
10793 /* Invert 'y' bit if not the default. */
10794 if ((bfd_signed_vma) (relocation + addend - from) < 0)
10795 insn ^= 0x01 << 21;
10796 }
10797
10798 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
10799 }
10800
10801 /* NOP out calls to undefined weak functions.
10802 We can thus call a weak function without first
10803 checking whether the function is defined. */
10804 else if (h != NULL
10805 && h->elf.root.type == bfd_link_hash_undefweak
10806 && r_type == R_PPC64_REL24
10807 && relocation == 0
10808 && addend == 0)
10809 {
10810 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset);
10811 continue;
10812 }
10813 break;
10814 }
10815
10816 /* Set `addend'. */
10817 tls_type = 0;
10818 switch (r_type)
10819 {
10820 default:
10821 (*_bfd_error_handler)
10822 (_("%B: unknown relocation type %d for symbol %s"),
10823 input_bfd, (int) r_type, sym_name);
10824
10825 bfd_set_error (bfd_error_bad_value);
10826 ret = FALSE;
10827 continue;
10828
10829 case R_PPC64_NONE:
10830 case R_PPC64_TLS:
10831 case R_PPC64_TLSGD:
10832 case R_PPC64_TLSLD:
10833 case R_PPC64_GNU_VTINHERIT:
10834 case R_PPC64_GNU_VTENTRY:
10835 continue;
10836
10837 /* GOT16 relocations. Like an ADDR16 using the symbol's
10838 address in the GOT as relocation value instead of the
10839 symbol's value itself. Also, create a GOT entry for the
10840 symbol and put the symbol value there. */
10841 case R_PPC64_GOT_TLSGD16:
10842 case R_PPC64_GOT_TLSGD16_LO:
10843 case R_PPC64_GOT_TLSGD16_HI:
10844 case R_PPC64_GOT_TLSGD16_HA:
10845 tls_type = TLS_TLS | TLS_GD;
10846 goto dogot;
10847
10848 case R_PPC64_GOT_TLSLD16:
10849 case R_PPC64_GOT_TLSLD16_LO:
10850 case R_PPC64_GOT_TLSLD16_HI:
10851 case R_PPC64_GOT_TLSLD16_HA:
10852 tls_type = TLS_TLS | TLS_LD;
10853 goto dogot;
10854
10855 case R_PPC64_GOT_TPREL16_DS:
10856 case R_PPC64_GOT_TPREL16_LO_DS:
10857 case R_PPC64_GOT_TPREL16_HI:
10858 case R_PPC64_GOT_TPREL16_HA:
10859 tls_type = TLS_TLS | TLS_TPREL;
10860 goto dogot;
10861
10862 case R_PPC64_GOT_DTPREL16_DS:
10863 case R_PPC64_GOT_DTPREL16_LO_DS:
10864 case R_PPC64_GOT_DTPREL16_HI:
10865 case R_PPC64_GOT_DTPREL16_HA:
10866 tls_type = TLS_TLS | TLS_DTPREL;
10867 goto dogot;
10868
10869 case R_PPC64_GOT16:
10870 case R_PPC64_GOT16_LO:
10871 case R_PPC64_GOT16_HI:
10872 case R_PPC64_GOT16_HA:
10873 case R_PPC64_GOT16_DS:
10874 case R_PPC64_GOT16_LO_DS:
10875 dogot:
10876 {
10877 /* Relocation is to the entry for this symbol in the global
10878 offset table. */
10879 asection *got;
10880 bfd_vma *offp;
10881 bfd_vma off;
10882 unsigned long indx = 0;
10883
10884 if (tls_type == (TLS_TLS | TLS_LD)
10885 && (h == NULL
10886 || !h->elf.def_dynamic))
10887 offp = &ppc64_tlsld_got (input_bfd)->offset;
10888 else
10889 {
10890 struct got_entry *ent;
10891
10892 if (h != NULL)
10893 {
10894 bfd_boolean dyn = htab->elf.dynamic_sections_created;
10895 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared,
10896 &h->elf)
10897 || (info->shared
10898 && SYMBOL_REFERENCES_LOCAL (info, &h->elf)))
10899 /* This is actually a static link, or it is a
10900 -Bsymbolic link and the symbol is defined
10901 locally, or the symbol was forced to be local
10902 because of a version file. */
10903 ;
10904 else
10905 {
10906 indx = h->elf.dynindx;
10907 unresolved_reloc = FALSE;
10908 }
10909 ent = h->elf.got.glist;
10910 }
10911 else
10912 {
10913 if (local_got_ents == NULL)
10914 abort ();
10915 ent = local_got_ents[r_symndx];
10916 }
10917
10918 for (; ent != NULL; ent = ent->next)
10919 if (ent->addend == orig_addend
10920 && ent->owner == input_bfd
10921 && ent->tls_type == tls_type)
10922 break;
10923 if (ent == NULL)
10924 abort ();
10925 offp = &ent->got.offset;
10926 }
10927
10928 got = ppc64_elf_tdata (input_bfd)->got;
10929 if (got == NULL)
10930 abort ();
10931
10932 /* The offset must always be a multiple of 8. We use the
10933 least significant bit to record whether we have already
10934 processed this entry. */
10935 off = *offp;
10936 if ((off & 1) != 0)
10937 off &= ~1;
10938 else
10939 {
10940 /* Generate relocs for the dynamic linker, except in
10941 the case of TLSLD where we'll use one entry per
10942 module. */
10943 asection *relgot = ppc64_elf_tdata (input_bfd)->relgot;
10944
10945 *offp = off | 1;
10946 if ((info->shared || indx != 0)
10947 && (offp == &ppc64_tlsld_got (input_bfd)->offset
10948 || h == NULL
10949 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT
10950 || h->elf.root.type != bfd_link_hash_undefweak))
10951 {
10952 outrel.r_offset = (got->output_section->vma
10953 + got->output_offset
10954 + off);
10955 outrel.r_addend = addend;
10956 if (tls_type & (TLS_LD | TLS_GD))
10957 {
10958 outrel.r_addend = 0;
10959 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64);
10960 if (tls_type == (TLS_TLS | TLS_GD))
10961 {
10962 loc = relgot->contents;
10963 loc += (relgot->reloc_count++
10964 * sizeof (Elf64_External_Rela));
10965 bfd_elf64_swap_reloca_out (output_bfd,
10966 &outrel, loc);
10967 outrel.r_offset += 8;
10968 outrel.r_addend = addend;
10969 outrel.r_info
10970 = ELF64_R_INFO (indx, R_PPC64_DTPREL64);
10971 }
10972 }
10973 else if (tls_type == (TLS_TLS | TLS_DTPREL))
10974 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64);
10975 else if (tls_type == (TLS_TLS | TLS_TPREL))
10976 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64);
10977 else if (indx == 0)
10978 {
10979 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_RELATIVE);
10980
10981 /* Write the .got section contents for the sake
10982 of prelink. */
10983 loc = got->contents + off;
10984 bfd_put_64 (output_bfd, outrel.r_addend + relocation,
10985 loc);
10986 }
10987 else
10988 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT);
10989
10990 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD))
10991 {
10992 outrel.r_addend += relocation;
10993 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL))
10994 outrel.r_addend -= htab->elf.tls_sec->vma;
10995 }
10996 loc = relgot->contents;
10997 loc += (relgot->reloc_count++
10998 * sizeof (Elf64_External_Rela));
10999 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
11000 }
11001
11002 /* Init the .got section contents here if we're not
11003 emitting a reloc. */
11004 else
11005 {
11006 relocation += addend;
11007 if (tls_type == (TLS_TLS | TLS_LD))
11008 relocation = 1;
11009 else if (tls_type != 0)
11010 {
11011 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET;
11012 if (tls_type == (TLS_TLS | TLS_TPREL))
11013 relocation += DTP_OFFSET - TP_OFFSET;
11014
11015 if (tls_type == (TLS_TLS | TLS_GD))
11016 {
11017 bfd_put_64 (output_bfd, relocation,
11018 got->contents + off + 8);
11019 relocation = 1;
11020 }
11021 }
11022
11023 bfd_put_64 (output_bfd, relocation,
11024 got->contents + off);
11025 }
11026 }
11027
11028 if (off >= (bfd_vma) -2)
11029 abort ();
11030
11031 relocation = got->output_offset + off;
11032
11033 /* TOC base (r2) is TOC start plus 0x8000. */
11034 addend = -TOC_BASE_OFF;
11035 }
11036 break;
11037
11038 case R_PPC64_PLT16_HA:
11039 case R_PPC64_PLT16_HI:
11040 case R_PPC64_PLT16_LO:
11041 case R_PPC64_PLT32:
11042 case R_PPC64_PLT64:
11043 /* Relocation is to the entry for this symbol in the
11044 procedure linkage table. */
11045
11046 /* Resolve a PLT reloc against a local symbol directly,
11047 without using the procedure linkage table. */
11048 if (h == NULL)
11049 break;
11050
11051 /* It's possible that we didn't make a PLT entry for this
11052 symbol. This happens when statically linking PIC code,
11053 or when using -Bsymbolic. Go find a match if there is a
11054 PLT entry. */
11055 if (htab->plt != NULL)
11056 {
11057 struct plt_entry *ent;
11058 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next)
11059 if (ent->addend == orig_addend
11060 && ent->plt.offset != (bfd_vma) -1)
11061 {
11062 relocation = (htab->plt->output_section->vma
11063 + htab->plt->output_offset
11064 + ent->plt.offset);
11065 unresolved_reloc = FALSE;
11066 }
11067 }
11068 break;
11069
11070 case R_PPC64_TOC:
11071 /* Relocation value is TOC base. */
11072 relocation = TOCstart;
11073 if (r_symndx == 0)
11074 relocation += htab->stub_group[input_section->id].toc_off;
11075 else if (unresolved_reloc)
11076 ;
11077 else if (sec != NULL && sec->id <= htab->top_id)
11078 relocation += htab->stub_group[sec->id].toc_off;
11079 else
11080 unresolved_reloc = TRUE;
11081 goto dodyn;
11082
11083 /* TOC16 relocs. We want the offset relative to the TOC base,
11084 which is the address of the start of the TOC plus 0x8000.
11085 The TOC consists of sections .got, .toc, .tocbss, and .plt,
11086 in this order. */
11087 case R_PPC64_TOC16:
11088 case R_PPC64_TOC16_LO:
11089 case R_PPC64_TOC16_HI:
11090 case R_PPC64_TOC16_DS:
11091 case R_PPC64_TOC16_LO_DS:
11092 case R_PPC64_TOC16_HA:
11093 addend -= TOCstart + htab->stub_group[input_section->id].toc_off;
11094 break;
11095
11096 /* Relocate against the beginning of the section. */
11097 case R_PPC64_SECTOFF:
11098 case R_PPC64_SECTOFF_LO:
11099 case R_PPC64_SECTOFF_HI:
11100 case R_PPC64_SECTOFF_DS:
11101 case R_PPC64_SECTOFF_LO_DS:
11102 case R_PPC64_SECTOFF_HA:
11103 if (sec != NULL)
11104 addend -= sec->output_section->vma;
11105 break;
11106
11107 case R_PPC64_REL14:
11108 case R_PPC64_REL14_BRNTAKEN:
11109 case R_PPC64_REL14_BRTAKEN:
11110 case R_PPC64_REL24:
11111 break;
11112
11113 case R_PPC64_TPREL16:
11114 case R_PPC64_TPREL16_LO:
11115 case R_PPC64_TPREL16_HI:
11116 case R_PPC64_TPREL16_HA:
11117 case R_PPC64_TPREL16_DS:
11118 case R_PPC64_TPREL16_LO_DS:
11119 case R_PPC64_TPREL16_HIGHER:
11120 case R_PPC64_TPREL16_HIGHERA:
11121 case R_PPC64_TPREL16_HIGHEST:
11122 case R_PPC64_TPREL16_HIGHESTA:
11123 addend -= htab->elf.tls_sec->vma + TP_OFFSET;
11124 if (info->shared)
11125 /* The TPREL16 relocs shouldn't really be used in shared
11126 libs as they will result in DT_TEXTREL being set, but
11127 support them anyway. */
11128 goto dodyn;
11129 break;
11130
11131 case R_PPC64_DTPREL16:
11132 case R_PPC64_DTPREL16_LO:
11133 case R_PPC64_DTPREL16_HI:
11134 case R_PPC64_DTPREL16_HA:
11135 case R_PPC64_DTPREL16_DS:
11136 case R_PPC64_DTPREL16_LO_DS:
11137 case R_PPC64_DTPREL16_HIGHER:
11138 case R_PPC64_DTPREL16_HIGHERA:
11139 case R_PPC64_DTPREL16_HIGHEST:
11140 case R_PPC64_DTPREL16_HIGHESTA:
11141 addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
11142 break;
11143
11144 case R_PPC64_DTPMOD64:
11145 relocation = 1;
11146 addend = 0;
11147 goto dodyn;
11148
11149 case R_PPC64_TPREL64:
11150 addend -= htab->elf.tls_sec->vma + TP_OFFSET;
11151 goto dodyn;
11152
11153 case R_PPC64_DTPREL64:
11154 addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
11155 /* Fall thru */
11156
11157 /* Relocations that may need to be propagated if this is a
11158 dynamic object. */
11159 case R_PPC64_REL30:
11160 case R_PPC64_REL32:
11161 case R_PPC64_REL64:
11162 case R_PPC64_ADDR14:
11163 case R_PPC64_ADDR14_BRNTAKEN:
11164 case R_PPC64_ADDR14_BRTAKEN:
11165 case R_PPC64_ADDR16:
11166 case R_PPC64_ADDR16_DS:
11167 case R_PPC64_ADDR16_HA:
11168 case R_PPC64_ADDR16_HI:
11169 case R_PPC64_ADDR16_HIGHER:
11170 case R_PPC64_ADDR16_HIGHERA:
11171 case R_PPC64_ADDR16_HIGHEST:
11172 case R_PPC64_ADDR16_HIGHESTA:
11173 case R_PPC64_ADDR16_LO:
11174 case R_PPC64_ADDR16_LO_DS:
11175 case R_PPC64_ADDR24:
11176 case R_PPC64_ADDR32:
11177 case R_PPC64_ADDR64:
11178 case R_PPC64_UADDR16:
11179 case R_PPC64_UADDR32:
11180 case R_PPC64_UADDR64:
11181 dodyn:
11182 if ((input_section->flags & SEC_ALLOC) == 0)
11183 break;
11184
11185 if (NO_OPD_RELOCS && is_opd)
11186 break;
11187
11188 if ((info->shared
11189 && (h == NULL
11190 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT
11191 || h->elf.root.type != bfd_link_hash_undefweak)
11192 && (must_be_dyn_reloc (info, r_type)
11193 || !SYMBOL_CALLS_LOCAL (info, &h->elf)))
11194 || (ELIMINATE_COPY_RELOCS
11195 && !info->shared
11196 && h != NULL
11197 && h->elf.dynindx != -1
11198 && !h->elf.non_got_ref
11199 && h->elf.def_dynamic
11200 && !h->elf.def_regular))
11201 {
11202 Elf_Internal_Rela outrel;
11203 bfd_boolean skip, relocate;
11204 asection *sreloc;
11205 bfd_byte *loc;
11206 bfd_vma out_off;
11207
11208 /* When generating a dynamic object, these relocations
11209 are copied into the output file to be resolved at run
11210 time. */
11211
11212 skip = FALSE;
11213 relocate = FALSE;
11214
11215 out_off = _bfd_elf_section_offset (output_bfd, info,
11216 input_section, rel->r_offset);
11217 if (out_off == (bfd_vma) -1)
11218 skip = TRUE;
11219 else if (out_off == (bfd_vma) -2)
11220 skip = TRUE, relocate = TRUE;
11221 out_off += (input_section->output_section->vma
11222 + input_section->output_offset);
11223 outrel.r_offset = out_off;
11224 outrel.r_addend = rel->r_addend;
11225
11226 /* Optimize unaligned reloc use. */
11227 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0)
11228 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0))
11229 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64;
11230 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0)
11231 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0))
11232 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32;
11233 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0)
11234 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0))
11235 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16;
11236
11237 if (skip)
11238 memset (&outrel, 0, sizeof outrel);
11239 else if (!SYMBOL_REFERENCES_LOCAL (info, &h->elf)
11240 && !is_opd
11241 && r_type != R_PPC64_TOC)
11242 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type);
11243 else
11244 {
11245 /* This symbol is local, or marked to become local,
11246 or this is an opd section reloc which must point
11247 at a local function. */
11248 outrel.r_addend += relocation;
11249 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC)
11250 {
11251 if (is_opd && h != NULL)
11252 {
11253 /* Lie about opd entries. This case occurs
11254 when building shared libraries and we
11255 reference a function in another shared
11256 lib. The same thing happens for a weak
11257 definition in an application that's
11258 overridden by a strong definition in a
11259 shared lib. (I believe this is a generic
11260 bug in binutils handling of weak syms.)
11261 In these cases we won't use the opd
11262 entry in this lib. */
11263 unresolved_reloc = FALSE;
11264 }
11265 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
11266
11267 /* We need to relocate .opd contents for ld.so.
11268 Prelink also wants simple and consistent rules
11269 for relocs. This make all RELATIVE relocs have
11270 *r_offset equal to r_addend. */
11271 relocate = TRUE;
11272 }
11273 else
11274 {
11275 long indx = 0;
11276
11277 if (r_symndx == 0 || bfd_is_abs_section (sec))
11278 ;
11279 else if (sec == NULL || sec->owner == NULL)
11280 {
11281 bfd_set_error (bfd_error_bad_value);
11282 return FALSE;
11283 }
11284 else
11285 {
11286 asection *osec;
11287
11288 osec = sec->output_section;
11289 indx = elf_section_data (osec)->dynindx;
11290
11291 if (indx == 0)
11292 {
11293 if ((osec->flags & SEC_READONLY) == 0
11294 && htab->elf.data_index_section != NULL)
11295 osec = htab->elf.data_index_section;
11296 else
11297 osec = htab->elf.text_index_section;
11298 indx = elf_section_data (osec)->dynindx;
11299 }
11300 BFD_ASSERT (indx != 0);
11301
11302 /* We are turning this relocation into one
11303 against a section symbol, so subtract out
11304 the output section's address but not the
11305 offset of the input section in the output
11306 section. */
11307 outrel.r_addend -= osec->vma;
11308 }
11309
11310 outrel.r_info = ELF64_R_INFO (indx, r_type);
11311 }
11312 }
11313
11314 sreloc = elf_section_data (input_section)->sreloc;
11315 if (sreloc == NULL)
11316 abort ();
11317
11318 if (sreloc->reloc_count * sizeof (Elf64_External_Rela)
11319 >= sreloc->size)
11320 abort ();
11321 loc = sreloc->contents;
11322 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
11323 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
11324
11325 /* If this reloc is against an external symbol, it will
11326 be computed at runtime, so there's no need to do
11327 anything now. However, for the sake of prelink ensure
11328 that the section contents are a known value. */
11329 if (! relocate)
11330 {
11331 unresolved_reloc = FALSE;
11332 /* The value chosen here is quite arbitrary as ld.so
11333 ignores section contents except for the special
11334 case of .opd where the contents might be accessed
11335 before relocation. Choose zero, as that won't
11336 cause reloc overflow. */
11337 relocation = 0;
11338 addend = 0;
11339 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs
11340 to improve backward compatibility with older
11341 versions of ld. */
11342 if (r_type == R_PPC64_ADDR64)
11343 addend = outrel.r_addend;
11344 /* Adjust pc_relative relocs to have zero in *r_offset. */
11345 else if (ppc64_elf_howto_table[r_type]->pc_relative)
11346 addend = (input_section->output_section->vma
11347 + input_section->output_offset
11348 + rel->r_offset);
11349 }
11350 }
11351 break;
11352
11353 case R_PPC64_COPY:
11354 case R_PPC64_GLOB_DAT:
11355 case R_PPC64_JMP_SLOT:
11356 case R_PPC64_RELATIVE:
11357 /* We shouldn't ever see these dynamic relocs in relocatable
11358 files. */
11359 /* Fall through. */
11360
11361 case R_PPC64_PLTGOT16:
11362 case R_PPC64_PLTGOT16_DS:
11363 case R_PPC64_PLTGOT16_HA:
11364 case R_PPC64_PLTGOT16_HI:
11365 case R_PPC64_PLTGOT16_LO:
11366 case R_PPC64_PLTGOT16_LO_DS:
11367 case R_PPC64_PLTREL32:
11368 case R_PPC64_PLTREL64:
11369 /* These ones haven't been implemented yet. */
11370
11371 (*_bfd_error_handler)
11372 (_("%B: relocation %s is not supported for symbol %s."),
11373 input_bfd,
11374 ppc64_elf_howto_table[r_type]->name, sym_name);
11375
11376 bfd_set_error (bfd_error_invalid_operation);
11377 ret = FALSE;
11378 continue;
11379 }
11380
11381 /* Do any further special processing. */
11382 switch (r_type)
11383 {
11384 default:
11385 break;
11386
11387 case R_PPC64_ADDR16_HA:
11388 case R_PPC64_ADDR16_HIGHERA:
11389 case R_PPC64_ADDR16_HIGHESTA:
11390 case R_PPC64_TOC16_HA:
11391 case R_PPC64_SECTOFF_HA:
11392 case R_PPC64_TPREL16_HA:
11393 case R_PPC64_DTPREL16_HA:
11394 case R_PPC64_TPREL16_HIGHER:
11395 case R_PPC64_TPREL16_HIGHERA:
11396 case R_PPC64_TPREL16_HIGHEST:
11397 case R_PPC64_TPREL16_HIGHESTA:
11398 case R_PPC64_DTPREL16_HIGHER:
11399 case R_PPC64_DTPREL16_HIGHERA:
11400 case R_PPC64_DTPREL16_HIGHEST:
11401 case R_PPC64_DTPREL16_HIGHESTA:
11402 /* It's just possible that this symbol is a weak symbol
11403 that's not actually defined anywhere. In that case,
11404 'sec' would be NULL, and we should leave the symbol
11405 alone (it will be set to zero elsewhere in the link). */
11406 if (sec == NULL)
11407 break;
11408 /* Fall thru */
11409
11410 case R_PPC64_GOT16_HA:
11411 case R_PPC64_PLTGOT16_HA:
11412 case R_PPC64_PLT16_HA:
11413 case R_PPC64_GOT_TLSGD16_HA:
11414 case R_PPC64_GOT_TLSLD16_HA:
11415 case R_PPC64_GOT_TPREL16_HA:
11416 case R_PPC64_GOT_DTPREL16_HA:
11417 /* Add 0x10000 if sign bit in 0:15 is set.
11418 Bits 0:15 are not used. */
11419 addend += 0x8000;
11420 break;
11421
11422 case R_PPC64_ADDR16_DS:
11423 case R_PPC64_ADDR16_LO_DS:
11424 case R_PPC64_GOT16_DS:
11425 case R_PPC64_GOT16_LO_DS:
11426 case R_PPC64_PLT16_LO_DS:
11427 case R_PPC64_SECTOFF_DS:
11428 case R_PPC64_SECTOFF_LO_DS:
11429 case R_PPC64_TOC16_DS:
11430 case R_PPC64_TOC16_LO_DS:
11431 case R_PPC64_PLTGOT16_DS:
11432 case R_PPC64_PLTGOT16_LO_DS:
11433 case R_PPC64_GOT_TPREL16_DS:
11434 case R_PPC64_GOT_TPREL16_LO_DS:
11435 case R_PPC64_GOT_DTPREL16_DS:
11436 case R_PPC64_GOT_DTPREL16_LO_DS:
11437 case R_PPC64_TPREL16_DS:
11438 case R_PPC64_TPREL16_LO_DS:
11439 case R_PPC64_DTPREL16_DS:
11440 case R_PPC64_DTPREL16_LO_DS:
11441 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3));
11442 mask = 3;
11443 /* If this reloc is against an lq insn, then the value must be
11444 a multiple of 16. This is somewhat of a hack, but the
11445 "correct" way to do this by defining _DQ forms of all the
11446 _DS relocs bloats all reloc switches in this file. It
11447 doesn't seem to make much sense to use any of these relocs
11448 in data, so testing the insn should be safe. */
11449 if ((insn & (0x3f << 26)) == (56u << 26))
11450 mask = 15;
11451 if (((relocation + addend) & mask) != 0)
11452 {
11453 (*_bfd_error_handler)
11454 (_("%B: error: relocation %s not a multiple of %d"),
11455 input_bfd,
11456 ppc64_elf_howto_table[r_type]->name,
11457 mask + 1);
11458 bfd_set_error (bfd_error_bad_value);
11459 ret = FALSE;
11460 continue;
11461 }
11462 break;
11463 }
11464
11465 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
11466 because such sections are not SEC_ALLOC and thus ld.so will
11467 not process them. */
11468 if (unresolved_reloc
11469 && !((input_section->flags & SEC_DEBUGGING) != 0
11470 && h->elf.def_dynamic))
11471 {
11472 (*_bfd_error_handler)
11473 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
11474 input_bfd,
11475 input_section,
11476 (long) rel->r_offset,
11477 ppc64_elf_howto_table[(int) r_type]->name,
11478 h->elf.root.root.string);
11479 ret = FALSE;
11480 }
11481
11482 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type],
11483 input_bfd,
11484 input_section,
11485 contents,
11486 rel->r_offset,
11487 relocation,
11488 addend);
11489
11490 if (r != bfd_reloc_ok)
11491 {
11492 if (sym_name == NULL)
11493 sym_name = "(null)";
11494 if (r == bfd_reloc_overflow)
11495 {
11496 if (warned)
11497 continue;
11498 if (h != NULL
11499 && h->elf.root.type == bfd_link_hash_undefweak
11500 && ppc64_elf_howto_table[r_type]->pc_relative)
11501 {
11502 /* Assume this is a call protected by other code that
11503 detects the symbol is undefined. If this is the case,
11504 we can safely ignore the overflow. If not, the
11505 program is hosed anyway, and a little warning isn't
11506 going to help. */
11507
11508 continue;
11509 }
11510
11511 if (!((*info->callbacks->reloc_overflow)
11512 (info, (h ? &h->elf.root : NULL), sym_name,
11513 ppc64_elf_howto_table[r_type]->name,
11514 orig_addend, input_bfd, input_section, rel->r_offset)))
11515 return FALSE;
11516 }
11517 else
11518 {
11519 (*_bfd_error_handler)
11520 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"),
11521 input_bfd,
11522 input_section,
11523 (long) rel->r_offset,
11524 ppc64_elf_howto_table[r_type]->name,
11525 sym_name,
11526 (int) r);
11527 ret = FALSE;
11528 }
11529 }
11530 }
11531
11532 /* If we're emitting relocations, then shortly after this function
11533 returns, reloc offsets and addends for this section will be
11534 adjusted. Worse, reloc symbol indices will be for the output
11535 file rather than the input. Save a copy of the relocs for
11536 opd_entry_value. */
11537 if (is_opd && (info->emitrelocations || info->relocatable))
11538 {
11539 bfd_size_type amt;
11540 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela);
11541 rel = bfd_alloc (input_bfd, amt);
11542 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL);
11543 ppc64_elf_tdata (input_bfd)->opd_relocs = rel;
11544 if (rel == NULL)
11545 return FALSE;
11546 memcpy (rel, relocs, amt);
11547 }
11548 return ret;
11549 }
11550
11551 /* Adjust the value of any local symbols in opd sections. */
11552
11553 static bfd_boolean
ppc64_elf_output_symbol_hook(struct bfd_link_info * info,const char * name ATTRIBUTE_UNUSED,Elf_Internal_Sym * elfsym,asection * input_sec,struct elf_link_hash_entry * h)11554 ppc64_elf_output_symbol_hook (struct bfd_link_info *info,
11555 const char *name ATTRIBUTE_UNUSED,
11556 Elf_Internal_Sym *elfsym,
11557 asection *input_sec,
11558 struct elf_link_hash_entry *h)
11559 {
11560 long *opd_adjust, adjust;
11561 bfd_vma value;
11562
11563 if (h != NULL)
11564 return TRUE;
11565
11566 opd_adjust = get_opd_info (input_sec);
11567 if (opd_adjust == NULL)
11568 return TRUE;
11569
11570 value = elfsym->st_value - input_sec->output_offset;
11571 if (!info->relocatable)
11572 value -= input_sec->output_section->vma;
11573
11574 adjust = opd_adjust[value / 8];
11575 if (adjust == -1)
11576 elfsym->st_value = 0;
11577 else
11578 elfsym->st_value += adjust;
11579 return TRUE;
11580 }
11581
11582 /* Finish up dynamic symbol handling. We set the contents of various
11583 dynamic sections here. */
11584
11585 static bfd_boolean
ppc64_elf_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)11586 ppc64_elf_finish_dynamic_symbol (bfd *output_bfd,
11587 struct bfd_link_info *info,
11588 struct elf_link_hash_entry *h,
11589 Elf_Internal_Sym *sym)
11590 {
11591 struct ppc_link_hash_table *htab;
11592 struct plt_entry *ent;
11593 Elf_Internal_Rela rela;
11594 bfd_byte *loc;
11595
11596 htab = ppc_hash_table (info);
11597
11598 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
11599 if (ent->plt.offset != (bfd_vma) -1)
11600 {
11601 /* This symbol has an entry in the procedure linkage
11602 table. Set it up. */
11603
11604 if (htab->plt == NULL
11605 || htab->relplt == NULL
11606 || htab->glink == NULL)
11607 abort ();
11608
11609 /* Create a JMP_SLOT reloc to inform the dynamic linker to
11610 fill in the PLT entry. */
11611 rela.r_offset = (htab->plt->output_section->vma
11612 + htab->plt->output_offset
11613 + ent->plt.offset);
11614 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT);
11615 rela.r_addend = ent->addend;
11616
11617 loc = htab->relplt->contents;
11618 loc += ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
11619 * sizeof (Elf64_External_Rela));
11620 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
11621 }
11622
11623 if (h->needs_copy)
11624 {
11625 Elf_Internal_Rela rela;
11626 bfd_byte *loc;
11627
11628 /* This symbol needs a copy reloc. Set it up. */
11629
11630 if (h->dynindx == -1
11631 || (h->root.type != bfd_link_hash_defined
11632 && h->root.type != bfd_link_hash_defweak)
11633 || htab->relbss == NULL)
11634 abort ();
11635
11636 rela.r_offset = (h->root.u.def.value
11637 + h->root.u.def.section->output_section->vma
11638 + h->root.u.def.section->output_offset);
11639 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY);
11640 rela.r_addend = 0;
11641 loc = htab->relbss->contents;
11642 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela);
11643 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
11644 }
11645
11646 /* Mark some specially defined symbols as absolute. */
11647 if (strcmp (h->root.root.string, "_DYNAMIC") == 0)
11648 sym->st_shndx = SHN_ABS;
11649
11650 return TRUE;
11651 }
11652
11653 /* Used to decide how to sort relocs in an optimal manner for the
11654 dynamic linker, before writing them out. */
11655
11656 static enum elf_reloc_type_class
ppc64_elf_reloc_type_class(const Elf_Internal_Rela * rela)11657 ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela)
11658 {
11659 enum elf_ppc64_reloc_type r_type;
11660
11661 r_type = ELF64_R_TYPE (rela->r_info);
11662 switch (r_type)
11663 {
11664 case R_PPC64_RELATIVE:
11665 return reloc_class_relative;
11666 case R_PPC64_JMP_SLOT:
11667 return reloc_class_plt;
11668 case R_PPC64_COPY:
11669 return reloc_class_copy;
11670 default:
11671 return reloc_class_normal;
11672 }
11673 }
11674
11675 /* Finish up the dynamic sections. */
11676
11677 static bfd_boolean
ppc64_elf_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)11678 ppc64_elf_finish_dynamic_sections (bfd *output_bfd,
11679 struct bfd_link_info *info)
11680 {
11681 struct ppc_link_hash_table *htab;
11682 bfd *dynobj;
11683 asection *sdyn;
11684
11685 htab = ppc_hash_table (info);
11686 dynobj = htab->elf.dynobj;
11687 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
11688
11689 if (htab->elf.dynamic_sections_created)
11690 {
11691 Elf64_External_Dyn *dyncon, *dynconend;
11692
11693 if (sdyn == NULL || htab->got == NULL)
11694 abort ();
11695
11696 dyncon = (Elf64_External_Dyn *) sdyn->contents;
11697 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
11698 for (; dyncon < dynconend; dyncon++)
11699 {
11700 Elf_Internal_Dyn dyn;
11701 asection *s;
11702
11703 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
11704
11705 switch (dyn.d_tag)
11706 {
11707 default:
11708 continue;
11709
11710 case DT_PPC64_GLINK:
11711 s = htab->glink;
11712 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11713 /* We stupidly defined DT_PPC64_GLINK to be the start
11714 of glink rather than the first entry point, which is
11715 what ld.so needs, and now have a bigger stub to
11716 support automatic multiple TOCs. */
11717 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32;
11718 break;
11719
11720 case DT_PPC64_OPD:
11721 s = bfd_get_section_by_name (output_bfd, ".opd");
11722 if (s == NULL)
11723 continue;
11724 dyn.d_un.d_ptr = s->vma;
11725 break;
11726
11727 case DT_PPC64_OPDSZ:
11728 s = bfd_get_section_by_name (output_bfd, ".opd");
11729 if (s == NULL)
11730 continue;
11731 dyn.d_un.d_val = s->size;
11732 break;
11733
11734 case DT_PLTGOT:
11735 s = htab->plt;
11736 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11737 break;
11738
11739 case DT_JMPREL:
11740 s = htab->relplt;
11741 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11742 break;
11743
11744 case DT_PLTRELSZ:
11745 dyn.d_un.d_val = htab->relplt->size;
11746 break;
11747
11748 case DT_RELASZ:
11749 /* Don't count procedure linkage table relocs in the
11750 overall reloc count. */
11751 s = htab->relplt;
11752 if (s == NULL)
11753 continue;
11754 dyn.d_un.d_val -= s->size;
11755 break;
11756
11757 case DT_RELA:
11758 /* We may not be using the standard ELF linker script.
11759 If .rela.plt is the first .rela section, we adjust
11760 DT_RELA to not include it. */
11761 s = htab->relplt;
11762 if (s == NULL)
11763 continue;
11764 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
11765 continue;
11766 dyn.d_un.d_ptr += s->size;
11767 break;
11768 }
11769
11770 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
11771 }
11772 }
11773
11774 if (htab->got != NULL && htab->got->size != 0)
11775 {
11776 /* Fill in the first entry in the global offset table.
11777 We use it to hold the link-time TOCbase. */
11778 bfd_put_64 (output_bfd,
11779 elf_gp (output_bfd) + TOC_BASE_OFF,
11780 htab->got->contents);
11781
11782 /* Set .got entry size. */
11783 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8;
11784 }
11785
11786 if (htab->plt != NULL && htab->plt->size != 0)
11787 {
11788 /* Set .plt entry size. */
11789 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize
11790 = PLT_ENTRY_SIZE;
11791 }
11792
11793 /* brlt is SEC_LINKER_CREATED, so we need to write out relocs for
11794 brlt ourselves if emitrelocations. */
11795 if (htab->brlt != NULL
11796 && htab->brlt->reloc_count != 0
11797 && !_bfd_elf_link_output_relocs (output_bfd,
11798 htab->brlt,
11799 &elf_section_data (htab->brlt)->rel_hdr,
11800 elf_section_data (htab->brlt)->relocs,
11801 NULL))
11802 return FALSE;
11803
11804 /* We need to handle writing out multiple GOT sections ourselves,
11805 since we didn't add them to DYNOBJ. We know dynobj is the first
11806 bfd. */
11807 while ((dynobj = dynobj->link_next) != NULL)
11808 {
11809 asection *s;
11810
11811 if (!is_ppc64_elf_target (dynobj->xvec))
11812 continue;
11813
11814 s = ppc64_elf_tdata (dynobj)->got;
11815 if (s != NULL
11816 && s->size != 0
11817 && s->output_section != bfd_abs_section_ptr
11818 && !bfd_set_section_contents (output_bfd, s->output_section,
11819 s->contents, s->output_offset,
11820 s->size))
11821 return FALSE;
11822 s = ppc64_elf_tdata (dynobj)->relgot;
11823 if (s != NULL
11824 && s->size != 0
11825 && s->output_section != bfd_abs_section_ptr
11826 && !bfd_set_section_contents (output_bfd, s->output_section,
11827 s->contents, s->output_offset,
11828 s->size))
11829 return FALSE;
11830 }
11831
11832 return TRUE;
11833 }
11834
11835 #include "elf64-target.h"
11836