1 /* PowerPC64-specific support for 64-bit ELF.
2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005
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 "bfd.h"
29 #include "sysdep.h"
30 #include "bfdlink.h"
31 #include "libbfd.h"
32 #include "elf-bfd.h"
33 #include "elf/ppc64.h"
34 #include "elf64-ppc.h"
35
36 static bfd_reloc_status_type ppc64_elf_ha_reloc
37 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
38 static bfd_reloc_status_type ppc64_elf_branch_reloc
39 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
40 static bfd_reloc_status_type ppc64_elf_brtaken_reloc
41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
42 static bfd_reloc_status_type ppc64_elf_sectoff_reloc
43 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
44 static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc
45 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
46 static bfd_reloc_status_type ppc64_elf_toc_reloc
47 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
48 static bfd_reloc_status_type ppc64_elf_toc_ha_reloc
49 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
50 static bfd_reloc_status_type ppc64_elf_toc64_reloc
51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
52 static bfd_reloc_status_type ppc64_elf_unhandled_reloc
53 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
54 static bfd_vma opd_entry_value
55 (asection *, bfd_vma, asection **, bfd_vma *);
56
57 #define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec
58 #define TARGET_LITTLE_NAME "elf64-powerpcle"
59 #define TARGET_BIG_SYM bfd_elf64_powerpc_vec
60 #define TARGET_BIG_NAME "elf64-powerpc"
61 #define ELF_ARCH bfd_arch_powerpc
62 #define ELF_MACHINE_CODE EM_PPC64
63 #define ELF_MAXPAGESIZE 0x10000
64 #define elf_info_to_howto ppc64_elf_info_to_howto
65
66 #define elf_backend_want_got_sym 0
67 #define elf_backend_want_plt_sym 0
68 #define elf_backend_plt_alignment 3
69 #define elf_backend_plt_not_loaded 1
70 #define elf_backend_got_header_size 8
71 #define elf_backend_can_gc_sections 1
72 #define elf_backend_can_refcount 1
73 #define elf_backend_rela_normal 1
74
75 #define bfd_elf64_mkobject ppc64_elf_mkobject
76 #define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup
77 #define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data
78 #define bfd_elf64_new_section_hook ppc64_elf_new_section_hook
79 #define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create
80 #define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free
81 #define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab
82
83 #define elf_backend_object_p ppc64_elf_object_p
84 #define elf_backend_grok_prstatus ppc64_elf_grok_prstatus
85 #define elf_backend_grok_psinfo ppc64_elf_grok_psinfo
86 #define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections
87 #define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol
88 #define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook
89 #define elf_backend_check_directives ppc64_elf_check_directives
90 #define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup
91 #define elf_backend_check_relocs ppc64_elf_check_relocs
92 #define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook
93 #define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook
94 #define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol
95 #define elf_backend_hide_symbol ppc64_elf_hide_symbol
96 #define elf_backend_always_size_sections ppc64_elf_func_desc_adjust
97 #define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections
98 #define elf_backend_relocate_section ppc64_elf_relocate_section
99 #define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol
100 #define elf_backend_reloc_type_class ppc64_elf_reloc_type_class
101 #define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections
102 #define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook
103 #define elf_backend_get_sec_type_attr ppc64_elf_get_sec_type_attr
104
105 /* The name of the dynamic interpreter. This is put in the .interp
106 section. */
107 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
108
109 /* The size in bytes of an entry in the procedure linkage table. */
110 #define PLT_ENTRY_SIZE 24
111
112 /* The initial size of the plt reserved for the dynamic linker. */
113 #define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE
114
115 /* TOC base pointers offset from start of TOC. */
116 #define TOC_BASE_OFF 0x8000
117
118 /* Offset of tp and dtp pointers from start of TLS block. */
119 #define TP_OFFSET 0x7000
120 #define DTP_OFFSET 0x8000
121
122 /* .plt call stub instructions. The normal stub is like this, but
123 sometimes the .plt entry crosses a 64k boundary and we need to
124 insert an addis to adjust r12. */
125 #define PLT_CALL_STUB_SIZE (7*4)
126 #define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */
127 #define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */
128 #define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */
129 #define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */
130 #define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */
131 /* ld %r11,xxx+16@l(%r12) */
132 #define BCTR 0x4e800420 /* bctr */
133
134
135 #define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */
136 #define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */
137
138 #define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */
139
140 /* glink call stub instructions. We enter with the index in R0, and the
141 address of glink entry in CTR. From that, we can calculate PLT0. */
142 #define GLINK_CALL_STUB_SIZE (16*4)
143 #define MFCTR_R12 0x7d8902a6 /* mfctr %r12 */
144 #define SLDI_R11_R0_3 0x780b1f24 /* sldi %r11,%r0,3 */
145 #define ADDIC_R2_R0_32K 0x34408000 /* addic. %r2,%r0,-32768 */
146 #define SUB_R12_R12_R11 0x7d8b6050 /* sub %r12,%r12,%r11 */
147 #define SRADI_R2_R2_63 0x7c42fe76 /* sradi %r2,%r2,63 */
148 #define SLDI_R11_R0_2 0x780b1764 /* sldi %r11,%r0,2 */
149 #define AND_R2_R2_R11 0x7c425838 /* and %r2,%r2,%r11 */
150 /* sub %r12,%r12,%r11 */
151 #define ADD_R12_R12_R2 0x7d8c1214 /* add %r12,%r12,%r2 */
152 #define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,xxx@ha */
153 /* ld %r11,xxx@l(%r12) */
154 #define ADDI_R12_R12 0x398c0000 /* addi %r12,%r12,xxx@l */
155 /* ld %r2,8(%r12) */
156 /* mtctr %r11 */
157 /* ld %r11,16(%r12) */
158 /* bctr */
159
160 /* Pad with this. */
161 #define NOP 0x60000000
162
163 /* Some other nops. */
164 #define CROR_151515 0x4def7b82
165 #define CROR_313131 0x4ffffb82
166
167 /* .glink entries for the first 32k functions are two instructions. */
168 #define LI_R0_0 0x38000000 /* li %r0,0 */
169 #define B_DOT 0x48000000 /* b . */
170
171 /* After that, we need two instructions to load the index, followed by
172 a branch. */
173 #define LIS_R0_0 0x3c000000 /* lis %r0,0 */
174 #define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */
175
176 /* Instructions used by the save and restore reg functions. */
177 #define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */
178 #define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */
179 #define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */
180 #define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */
181 #define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */
182 #define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */
183 #define LI_R12_0 0x39800000 /* li %r12,0 */
184 #define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */
185 #define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */
186 #define MTLR_R0 0x7c0803a6 /* mtlr %r0 */
187 #define BLR 0x4e800020 /* blr */
188
189 /* Since .opd is an array of descriptors and each entry will end up
190 with identical R_PPC64_RELATIVE relocs, there is really no need to
191 propagate .opd relocs; The dynamic linker should be taught to
192 relocate .opd without reloc entries. */
193 #ifndef NO_OPD_RELOCS
194 #define NO_OPD_RELOCS 0
195 #endif
196
197 #define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1)
198
199 /* Relocation HOWTO's. */
200 static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max];
201
202 static reloc_howto_type ppc64_elf_howto_raw[] = {
203 /* This reloc does nothing. */
204 HOWTO (R_PPC64_NONE, /* type */
205 0, /* rightshift */
206 2, /* size (0 = byte, 1 = short, 2 = long) */
207 32, /* bitsize */
208 FALSE, /* pc_relative */
209 0, /* bitpos */
210 complain_overflow_dont, /* complain_on_overflow */
211 bfd_elf_generic_reloc, /* special_function */
212 "R_PPC64_NONE", /* name */
213 FALSE, /* partial_inplace */
214 0, /* src_mask */
215 0, /* dst_mask */
216 FALSE), /* pcrel_offset */
217
218 /* A standard 32 bit relocation. */
219 HOWTO (R_PPC64_ADDR32, /* type */
220 0, /* rightshift */
221 2, /* size (0 = byte, 1 = short, 2 = long) */
222 32, /* bitsize */
223 FALSE, /* pc_relative */
224 0, /* bitpos */
225 complain_overflow_bitfield, /* complain_on_overflow */
226 bfd_elf_generic_reloc, /* special_function */
227 "R_PPC64_ADDR32", /* name */
228 FALSE, /* partial_inplace */
229 0, /* src_mask */
230 0xffffffff, /* dst_mask */
231 FALSE), /* pcrel_offset */
232
233 /* An absolute 26 bit branch; the lower two bits must be zero.
234 FIXME: we don't check that, we just clear them. */
235 HOWTO (R_PPC64_ADDR24, /* type */
236 0, /* rightshift */
237 2, /* size (0 = byte, 1 = short, 2 = long) */
238 26, /* bitsize */
239 FALSE, /* pc_relative */
240 0, /* bitpos */
241 complain_overflow_bitfield, /* complain_on_overflow */
242 bfd_elf_generic_reloc, /* special_function */
243 "R_PPC64_ADDR24", /* name */
244 FALSE, /* partial_inplace */
245 0, /* src_mask */
246 0x03fffffc, /* dst_mask */
247 FALSE), /* pcrel_offset */
248
249 /* A standard 16 bit relocation. */
250 HOWTO (R_PPC64_ADDR16, /* type */
251 0, /* rightshift */
252 1, /* size (0 = byte, 1 = short, 2 = long) */
253 16, /* bitsize */
254 FALSE, /* pc_relative */
255 0, /* bitpos */
256 complain_overflow_bitfield, /* complain_on_overflow */
257 bfd_elf_generic_reloc, /* special_function */
258 "R_PPC64_ADDR16", /* name */
259 FALSE, /* partial_inplace */
260 0, /* src_mask */
261 0xffff, /* dst_mask */
262 FALSE), /* pcrel_offset */
263
264 /* A 16 bit relocation without overflow. */
265 HOWTO (R_PPC64_ADDR16_LO, /* type */
266 0, /* rightshift */
267 1, /* size (0 = byte, 1 = short, 2 = long) */
268 16, /* bitsize */
269 FALSE, /* pc_relative */
270 0, /* bitpos */
271 complain_overflow_dont,/* complain_on_overflow */
272 bfd_elf_generic_reloc, /* special_function */
273 "R_PPC64_ADDR16_LO", /* name */
274 FALSE, /* partial_inplace */
275 0, /* src_mask */
276 0xffff, /* dst_mask */
277 FALSE), /* pcrel_offset */
278
279 /* Bits 16-31 of an address. */
280 HOWTO (R_PPC64_ADDR16_HI, /* type */
281 16, /* rightshift */
282 1, /* size (0 = byte, 1 = short, 2 = long) */
283 16, /* bitsize */
284 FALSE, /* pc_relative */
285 0, /* bitpos */
286 complain_overflow_dont, /* complain_on_overflow */
287 bfd_elf_generic_reloc, /* special_function */
288 "R_PPC64_ADDR16_HI", /* name */
289 FALSE, /* partial_inplace */
290 0, /* src_mask */
291 0xffff, /* dst_mask */
292 FALSE), /* pcrel_offset */
293
294 /* Bits 16-31 of an address, plus 1 if the contents of the low 16
295 bits, treated as a signed number, is negative. */
296 HOWTO (R_PPC64_ADDR16_HA, /* type */
297 16, /* rightshift */
298 1, /* size (0 = byte, 1 = short, 2 = long) */
299 16, /* bitsize */
300 FALSE, /* pc_relative */
301 0, /* bitpos */
302 complain_overflow_dont, /* complain_on_overflow */
303 ppc64_elf_ha_reloc, /* special_function */
304 "R_PPC64_ADDR16_HA", /* name */
305 FALSE, /* partial_inplace */
306 0, /* src_mask */
307 0xffff, /* dst_mask */
308 FALSE), /* pcrel_offset */
309
310 /* An absolute 16 bit branch; the lower two bits must be zero.
311 FIXME: we don't check that, we just clear them. */
312 HOWTO (R_PPC64_ADDR14, /* type */
313 0, /* rightshift */
314 2, /* size (0 = byte, 1 = short, 2 = long) */
315 16, /* bitsize */
316 FALSE, /* pc_relative */
317 0, /* bitpos */
318 complain_overflow_bitfield, /* complain_on_overflow */
319 ppc64_elf_branch_reloc, /* special_function */
320 "R_PPC64_ADDR14", /* name */
321 FALSE, /* partial_inplace */
322 0, /* src_mask */
323 0x0000fffc, /* dst_mask */
324 FALSE), /* pcrel_offset */
325
326 /* An absolute 16 bit branch, for which bit 10 should be set to
327 indicate that the branch is expected to be taken. The lower two
328 bits must be zero. */
329 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */
330 0, /* rightshift */
331 2, /* size (0 = byte, 1 = short, 2 = long) */
332 16, /* bitsize */
333 FALSE, /* pc_relative */
334 0, /* bitpos */
335 complain_overflow_bitfield, /* complain_on_overflow */
336 ppc64_elf_brtaken_reloc, /* special_function */
337 "R_PPC64_ADDR14_BRTAKEN",/* name */
338 FALSE, /* partial_inplace */
339 0, /* src_mask */
340 0x0000fffc, /* dst_mask */
341 FALSE), /* pcrel_offset */
342
343 /* An absolute 16 bit branch, for which bit 10 should be set to
344 indicate that the branch is not expected to be taken. The lower
345 two bits must be zero. */
346 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */
347 0, /* rightshift */
348 2, /* size (0 = byte, 1 = short, 2 = long) */
349 16, /* bitsize */
350 FALSE, /* pc_relative */
351 0, /* bitpos */
352 complain_overflow_bitfield, /* complain_on_overflow */
353 ppc64_elf_brtaken_reloc, /* special_function */
354 "R_PPC64_ADDR14_BRNTAKEN",/* name */
355 FALSE, /* partial_inplace */
356 0, /* src_mask */
357 0x0000fffc, /* dst_mask */
358 FALSE), /* pcrel_offset */
359
360 /* A relative 26 bit branch; the lower two bits must be zero. */
361 HOWTO (R_PPC64_REL24, /* type */
362 0, /* rightshift */
363 2, /* size (0 = byte, 1 = short, 2 = long) */
364 26, /* bitsize */
365 TRUE, /* pc_relative */
366 0, /* bitpos */
367 complain_overflow_signed, /* complain_on_overflow */
368 ppc64_elf_branch_reloc, /* special_function */
369 "R_PPC64_REL24", /* name */
370 FALSE, /* partial_inplace */
371 0, /* src_mask */
372 0x03fffffc, /* dst_mask */
373 TRUE), /* pcrel_offset */
374
375 /* A relative 16 bit branch; the lower two bits must be zero. */
376 HOWTO (R_PPC64_REL14, /* type */
377 0, /* rightshift */
378 2, /* size (0 = byte, 1 = short, 2 = long) */
379 16, /* bitsize */
380 TRUE, /* pc_relative */
381 0, /* bitpos */
382 complain_overflow_signed, /* complain_on_overflow */
383 ppc64_elf_branch_reloc, /* special_function */
384 "R_PPC64_REL14", /* name */
385 FALSE, /* partial_inplace */
386 0, /* src_mask */
387 0x0000fffc, /* dst_mask */
388 TRUE), /* pcrel_offset */
389
390 /* A relative 16 bit branch. Bit 10 should be set to indicate that
391 the branch is expected to be taken. The lower two bits must be
392 zero. */
393 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */
394 0, /* rightshift */
395 2, /* size (0 = byte, 1 = short, 2 = long) */
396 16, /* bitsize */
397 TRUE, /* pc_relative */
398 0, /* bitpos */
399 complain_overflow_signed, /* complain_on_overflow */
400 ppc64_elf_brtaken_reloc, /* special_function */
401 "R_PPC64_REL14_BRTAKEN", /* name */
402 FALSE, /* partial_inplace */
403 0, /* src_mask */
404 0x0000fffc, /* dst_mask */
405 TRUE), /* pcrel_offset */
406
407 /* A relative 16 bit branch. Bit 10 should be set to indicate that
408 the branch is not expected to be taken. The lower two bits must
409 be zero. */
410 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */
411 0, /* rightshift */
412 2, /* size (0 = byte, 1 = short, 2 = long) */
413 16, /* bitsize */
414 TRUE, /* pc_relative */
415 0, /* bitpos */
416 complain_overflow_signed, /* complain_on_overflow */
417 ppc64_elf_brtaken_reloc, /* special_function */
418 "R_PPC64_REL14_BRNTAKEN",/* name */
419 FALSE, /* partial_inplace */
420 0, /* src_mask */
421 0x0000fffc, /* dst_mask */
422 TRUE), /* pcrel_offset */
423
424 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the
425 symbol. */
426 HOWTO (R_PPC64_GOT16, /* type */
427 0, /* rightshift */
428 1, /* size (0 = byte, 1 = short, 2 = long) */
429 16, /* bitsize */
430 FALSE, /* pc_relative */
431 0, /* bitpos */
432 complain_overflow_signed, /* complain_on_overflow */
433 ppc64_elf_unhandled_reloc, /* special_function */
434 "R_PPC64_GOT16", /* name */
435 FALSE, /* partial_inplace */
436 0, /* src_mask */
437 0xffff, /* dst_mask */
438 FALSE), /* pcrel_offset */
439
440 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for
441 the symbol. */
442 HOWTO (R_PPC64_GOT16_LO, /* type */
443 0, /* rightshift */
444 1, /* size (0 = byte, 1 = short, 2 = long) */
445 16, /* bitsize */
446 FALSE, /* pc_relative */
447 0, /* bitpos */
448 complain_overflow_dont, /* complain_on_overflow */
449 ppc64_elf_unhandled_reloc, /* special_function */
450 "R_PPC64_GOT16_LO", /* name */
451 FALSE, /* partial_inplace */
452 0, /* src_mask */
453 0xffff, /* dst_mask */
454 FALSE), /* pcrel_offset */
455
456 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for
457 the symbol. */
458 HOWTO (R_PPC64_GOT16_HI, /* type */
459 16, /* rightshift */
460 1, /* size (0 = byte, 1 = short, 2 = long) */
461 16, /* bitsize */
462 FALSE, /* pc_relative */
463 0, /* bitpos */
464 complain_overflow_dont,/* complain_on_overflow */
465 ppc64_elf_unhandled_reloc, /* special_function */
466 "R_PPC64_GOT16_HI", /* name */
467 FALSE, /* partial_inplace */
468 0, /* src_mask */
469 0xffff, /* dst_mask */
470 FALSE), /* pcrel_offset */
471
472 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for
473 the symbol. */
474 HOWTO (R_PPC64_GOT16_HA, /* type */
475 16, /* rightshift */
476 1, /* size (0 = byte, 1 = short, 2 = long) */
477 16, /* bitsize */
478 FALSE, /* pc_relative */
479 0, /* bitpos */
480 complain_overflow_dont,/* complain_on_overflow */
481 ppc64_elf_unhandled_reloc, /* special_function */
482 "R_PPC64_GOT16_HA", /* name */
483 FALSE, /* partial_inplace */
484 0, /* src_mask */
485 0xffff, /* dst_mask */
486 FALSE), /* pcrel_offset */
487
488 /* This is used only by the dynamic linker. The symbol should exist
489 both in the object being run and in some shared library. The
490 dynamic linker copies the data addressed by the symbol from the
491 shared library into the object, because the object being
492 run has to have the data at some particular address. */
493 HOWTO (R_PPC64_COPY, /* type */
494 0, /* rightshift */
495 0, /* this one is variable size */
496 0, /* bitsize */
497 FALSE, /* pc_relative */
498 0, /* bitpos */
499 complain_overflow_dont, /* complain_on_overflow */
500 ppc64_elf_unhandled_reloc, /* special_function */
501 "R_PPC64_COPY", /* name */
502 FALSE, /* partial_inplace */
503 0, /* src_mask */
504 0, /* dst_mask */
505 FALSE), /* pcrel_offset */
506
507 /* Like R_PPC64_ADDR64, but used when setting global offset table
508 entries. */
509 HOWTO (R_PPC64_GLOB_DAT, /* type */
510 0, /* rightshift */
511 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
512 64, /* bitsize */
513 FALSE, /* pc_relative */
514 0, /* bitpos */
515 complain_overflow_dont, /* complain_on_overflow */
516 ppc64_elf_unhandled_reloc, /* special_function */
517 "R_PPC64_GLOB_DAT", /* name */
518 FALSE, /* partial_inplace */
519 0, /* src_mask */
520 ONES (64), /* dst_mask */
521 FALSE), /* pcrel_offset */
522
523 /* Created by the link editor. Marks a procedure linkage table
524 entry for a symbol. */
525 HOWTO (R_PPC64_JMP_SLOT, /* type */
526 0, /* rightshift */
527 0, /* size (0 = byte, 1 = short, 2 = long) */
528 0, /* bitsize */
529 FALSE, /* pc_relative */
530 0, /* bitpos */
531 complain_overflow_dont, /* complain_on_overflow */
532 ppc64_elf_unhandled_reloc, /* special_function */
533 "R_PPC64_JMP_SLOT", /* name */
534 FALSE, /* partial_inplace */
535 0, /* src_mask */
536 0, /* dst_mask */
537 FALSE), /* pcrel_offset */
538
539 /* Used only by the dynamic linker. When the object is run, this
540 doubleword64 is set to the load address of the object, plus the
541 addend. */
542 HOWTO (R_PPC64_RELATIVE, /* type */
543 0, /* rightshift */
544 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
545 64, /* bitsize */
546 FALSE, /* pc_relative */
547 0, /* bitpos */
548 complain_overflow_dont, /* complain_on_overflow */
549 bfd_elf_generic_reloc, /* special_function */
550 "R_PPC64_RELATIVE", /* name */
551 FALSE, /* partial_inplace */
552 0, /* src_mask */
553 ONES (64), /* dst_mask */
554 FALSE), /* pcrel_offset */
555
556 /* Like R_PPC64_ADDR32, but may be unaligned. */
557 HOWTO (R_PPC64_UADDR32, /* type */
558 0, /* rightshift */
559 2, /* size (0 = byte, 1 = short, 2 = long) */
560 32, /* bitsize */
561 FALSE, /* pc_relative */
562 0, /* bitpos */
563 complain_overflow_bitfield, /* complain_on_overflow */
564 bfd_elf_generic_reloc, /* special_function */
565 "R_PPC64_UADDR32", /* name */
566 FALSE, /* partial_inplace */
567 0, /* src_mask */
568 0xffffffff, /* dst_mask */
569 FALSE), /* pcrel_offset */
570
571 /* Like R_PPC64_ADDR16, but may be unaligned. */
572 HOWTO (R_PPC64_UADDR16, /* type */
573 0, /* rightshift */
574 1, /* size (0 = byte, 1 = short, 2 = long) */
575 16, /* bitsize */
576 FALSE, /* pc_relative */
577 0, /* bitpos */
578 complain_overflow_bitfield, /* complain_on_overflow */
579 bfd_elf_generic_reloc, /* special_function */
580 "R_PPC64_UADDR16", /* name */
581 FALSE, /* partial_inplace */
582 0, /* src_mask */
583 0xffff, /* dst_mask */
584 FALSE), /* pcrel_offset */
585
586 /* 32-bit PC relative. */
587 HOWTO (R_PPC64_REL32, /* type */
588 0, /* rightshift */
589 2, /* size (0 = byte, 1 = short, 2 = long) */
590 32, /* bitsize */
591 TRUE, /* pc_relative */
592 0, /* bitpos */
593 /* FIXME: Verify. Was complain_overflow_bitfield. */
594 complain_overflow_signed, /* complain_on_overflow */
595 bfd_elf_generic_reloc, /* special_function */
596 "R_PPC64_REL32", /* name */
597 FALSE, /* partial_inplace */
598 0, /* src_mask */
599 0xffffffff, /* dst_mask */
600 TRUE), /* pcrel_offset */
601
602 /* 32-bit relocation to the symbol's procedure linkage table. */
603 HOWTO (R_PPC64_PLT32, /* type */
604 0, /* rightshift */
605 2, /* size (0 = byte, 1 = short, 2 = long) */
606 32, /* bitsize */
607 FALSE, /* pc_relative */
608 0, /* bitpos */
609 complain_overflow_bitfield, /* complain_on_overflow */
610 ppc64_elf_unhandled_reloc, /* special_function */
611 "R_PPC64_PLT32", /* name */
612 FALSE, /* partial_inplace */
613 0, /* src_mask */
614 0xffffffff, /* dst_mask */
615 FALSE), /* pcrel_offset */
616
617 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
618 FIXME: R_PPC64_PLTREL32 not supported. */
619 HOWTO (R_PPC64_PLTREL32, /* type */
620 0, /* rightshift */
621 2, /* size (0 = byte, 1 = short, 2 = long) */
622 32, /* bitsize */
623 TRUE, /* pc_relative */
624 0, /* bitpos */
625 complain_overflow_signed, /* complain_on_overflow */
626 bfd_elf_generic_reloc, /* special_function */
627 "R_PPC64_PLTREL32", /* name */
628 FALSE, /* partial_inplace */
629 0, /* src_mask */
630 0xffffffff, /* dst_mask */
631 TRUE), /* pcrel_offset */
632
633 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for
634 the symbol. */
635 HOWTO (R_PPC64_PLT16_LO, /* type */
636 0, /* rightshift */
637 1, /* size (0 = byte, 1 = short, 2 = long) */
638 16, /* bitsize */
639 FALSE, /* pc_relative */
640 0, /* bitpos */
641 complain_overflow_dont, /* complain_on_overflow */
642 ppc64_elf_unhandled_reloc, /* special_function */
643 "R_PPC64_PLT16_LO", /* name */
644 FALSE, /* partial_inplace */
645 0, /* src_mask */
646 0xffff, /* dst_mask */
647 FALSE), /* pcrel_offset */
648
649 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for
650 the symbol. */
651 HOWTO (R_PPC64_PLT16_HI, /* type */
652 16, /* rightshift */
653 1, /* size (0 = byte, 1 = short, 2 = long) */
654 16, /* bitsize */
655 FALSE, /* pc_relative */
656 0, /* bitpos */
657 complain_overflow_dont, /* complain_on_overflow */
658 ppc64_elf_unhandled_reloc, /* special_function */
659 "R_PPC64_PLT16_HI", /* name */
660 FALSE, /* partial_inplace */
661 0, /* src_mask */
662 0xffff, /* dst_mask */
663 FALSE), /* pcrel_offset */
664
665 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for
666 the symbol. */
667 HOWTO (R_PPC64_PLT16_HA, /* type */
668 16, /* rightshift */
669 1, /* size (0 = byte, 1 = short, 2 = long) */
670 16, /* bitsize */
671 FALSE, /* pc_relative */
672 0, /* bitpos */
673 complain_overflow_dont, /* complain_on_overflow */
674 ppc64_elf_unhandled_reloc, /* special_function */
675 "R_PPC64_PLT16_HA", /* name */
676 FALSE, /* partial_inplace */
677 0, /* src_mask */
678 0xffff, /* dst_mask */
679 FALSE), /* pcrel_offset */
680
681 /* 16-bit section relative relocation. */
682 HOWTO (R_PPC64_SECTOFF, /* type */
683 0, /* rightshift */
684 1, /* size (0 = byte, 1 = short, 2 = long) */
685 16, /* bitsize */
686 FALSE, /* pc_relative */
687 0, /* bitpos */
688 complain_overflow_bitfield, /* complain_on_overflow */
689 ppc64_elf_sectoff_reloc, /* special_function */
690 "R_PPC64_SECTOFF", /* name */
691 FALSE, /* partial_inplace */
692 0, /* src_mask */
693 0xffff, /* dst_mask */
694 FALSE), /* pcrel_offset */
695
696 /* Like R_PPC64_SECTOFF, but no overflow warning. */
697 HOWTO (R_PPC64_SECTOFF_LO, /* type */
698 0, /* rightshift */
699 1, /* size (0 = byte, 1 = short, 2 = long) */
700 16, /* bitsize */
701 FALSE, /* pc_relative */
702 0, /* bitpos */
703 complain_overflow_dont, /* complain_on_overflow */
704 ppc64_elf_sectoff_reloc, /* special_function */
705 "R_PPC64_SECTOFF_LO", /* name */
706 FALSE, /* partial_inplace */
707 0, /* src_mask */
708 0xffff, /* dst_mask */
709 FALSE), /* pcrel_offset */
710
711 /* 16-bit upper half section relative relocation. */
712 HOWTO (R_PPC64_SECTOFF_HI, /* type */
713 16, /* rightshift */
714 1, /* size (0 = byte, 1 = short, 2 = long) */
715 16, /* bitsize */
716 FALSE, /* pc_relative */
717 0, /* bitpos */
718 complain_overflow_dont, /* complain_on_overflow */
719 ppc64_elf_sectoff_reloc, /* special_function */
720 "R_PPC64_SECTOFF_HI", /* name */
721 FALSE, /* partial_inplace */
722 0, /* src_mask */
723 0xffff, /* dst_mask */
724 FALSE), /* pcrel_offset */
725
726 /* 16-bit upper half adjusted section relative relocation. */
727 HOWTO (R_PPC64_SECTOFF_HA, /* type */
728 16, /* rightshift */
729 1, /* size (0 = byte, 1 = short, 2 = long) */
730 16, /* bitsize */
731 FALSE, /* pc_relative */
732 0, /* bitpos */
733 complain_overflow_dont, /* complain_on_overflow */
734 ppc64_elf_sectoff_ha_reloc, /* special_function */
735 "R_PPC64_SECTOFF_HA", /* name */
736 FALSE, /* partial_inplace */
737 0, /* src_mask */
738 0xffff, /* dst_mask */
739 FALSE), /* pcrel_offset */
740
741 /* Like R_PPC64_REL24 without touching the two least significant bits. */
742 HOWTO (R_PPC64_REL30, /* type */
743 2, /* rightshift */
744 2, /* size (0 = byte, 1 = short, 2 = long) */
745 30, /* bitsize */
746 TRUE, /* pc_relative */
747 0, /* bitpos */
748 complain_overflow_dont, /* complain_on_overflow */
749 bfd_elf_generic_reloc, /* special_function */
750 "R_PPC64_REL30", /* name */
751 FALSE, /* partial_inplace */
752 0, /* src_mask */
753 0xfffffffc, /* dst_mask */
754 TRUE), /* pcrel_offset */
755
756 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */
757
758 /* A standard 64-bit relocation. */
759 HOWTO (R_PPC64_ADDR64, /* type */
760 0, /* rightshift */
761 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
762 64, /* bitsize */
763 FALSE, /* pc_relative */
764 0, /* bitpos */
765 complain_overflow_dont, /* complain_on_overflow */
766 bfd_elf_generic_reloc, /* special_function */
767 "R_PPC64_ADDR64", /* name */
768 FALSE, /* partial_inplace */
769 0, /* src_mask */
770 ONES (64), /* dst_mask */
771 FALSE), /* pcrel_offset */
772
773 /* The bits 32-47 of an address. */
774 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */
775 32, /* rightshift */
776 1, /* size (0 = byte, 1 = short, 2 = long) */
777 16, /* bitsize */
778 FALSE, /* pc_relative */
779 0, /* bitpos */
780 complain_overflow_dont, /* complain_on_overflow */
781 bfd_elf_generic_reloc, /* special_function */
782 "R_PPC64_ADDR16_HIGHER", /* name */
783 FALSE, /* partial_inplace */
784 0, /* src_mask */
785 0xffff, /* dst_mask */
786 FALSE), /* pcrel_offset */
787
788 /* The bits 32-47 of an address, plus 1 if the contents of the low
789 16 bits, treated as a signed number, is negative. */
790 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */
791 32, /* rightshift */
792 1, /* size (0 = byte, 1 = short, 2 = long) */
793 16, /* bitsize */
794 FALSE, /* pc_relative */
795 0, /* bitpos */
796 complain_overflow_dont, /* complain_on_overflow */
797 ppc64_elf_ha_reloc, /* special_function */
798 "R_PPC64_ADDR16_HIGHERA", /* name */
799 FALSE, /* partial_inplace */
800 0, /* src_mask */
801 0xffff, /* dst_mask */
802 FALSE), /* pcrel_offset */
803
804 /* The bits 48-63 of an address. */
805 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */
806 48, /* rightshift */
807 1, /* size (0 = byte, 1 = short, 2 = long) */
808 16, /* bitsize */
809 FALSE, /* pc_relative */
810 0, /* bitpos */
811 complain_overflow_dont, /* complain_on_overflow */
812 bfd_elf_generic_reloc, /* special_function */
813 "R_PPC64_ADDR16_HIGHEST", /* name */
814 FALSE, /* partial_inplace */
815 0, /* src_mask */
816 0xffff, /* dst_mask */
817 FALSE), /* pcrel_offset */
818
819 /* The bits 48-63 of an address, plus 1 if the contents of the low
820 16 bits, treated as a signed number, is negative. */
821 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */
822 48, /* rightshift */
823 1, /* size (0 = byte, 1 = short, 2 = long) */
824 16, /* bitsize */
825 FALSE, /* pc_relative */
826 0, /* bitpos */
827 complain_overflow_dont, /* complain_on_overflow */
828 ppc64_elf_ha_reloc, /* special_function */
829 "R_PPC64_ADDR16_HIGHESTA", /* name */
830 FALSE, /* partial_inplace */
831 0, /* src_mask */
832 0xffff, /* dst_mask */
833 FALSE), /* pcrel_offset */
834
835 /* Like ADDR64, but may be unaligned. */
836 HOWTO (R_PPC64_UADDR64, /* type */
837 0, /* rightshift */
838 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
839 64, /* bitsize */
840 FALSE, /* pc_relative */
841 0, /* bitpos */
842 complain_overflow_dont, /* complain_on_overflow */
843 bfd_elf_generic_reloc, /* special_function */
844 "R_PPC64_UADDR64", /* name */
845 FALSE, /* partial_inplace */
846 0, /* src_mask */
847 ONES (64), /* dst_mask */
848 FALSE), /* pcrel_offset */
849
850 /* 64-bit relative relocation. */
851 HOWTO (R_PPC64_REL64, /* type */
852 0, /* rightshift */
853 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
854 64, /* bitsize */
855 TRUE, /* pc_relative */
856 0, /* bitpos */
857 complain_overflow_dont, /* complain_on_overflow */
858 bfd_elf_generic_reloc, /* special_function */
859 "R_PPC64_REL64", /* name */
860 FALSE, /* partial_inplace */
861 0, /* src_mask */
862 ONES (64), /* dst_mask */
863 TRUE), /* pcrel_offset */
864
865 /* 64-bit relocation to the symbol's procedure linkage table. */
866 HOWTO (R_PPC64_PLT64, /* type */
867 0, /* rightshift */
868 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
869 64, /* bitsize */
870 FALSE, /* pc_relative */
871 0, /* bitpos */
872 complain_overflow_dont, /* complain_on_overflow */
873 ppc64_elf_unhandled_reloc, /* special_function */
874 "R_PPC64_PLT64", /* name */
875 FALSE, /* partial_inplace */
876 0, /* src_mask */
877 ONES (64), /* dst_mask */
878 FALSE), /* pcrel_offset */
879
880 /* 64-bit PC relative relocation to the symbol's procedure linkage
881 table. */
882 /* FIXME: R_PPC64_PLTREL64 not supported. */
883 HOWTO (R_PPC64_PLTREL64, /* type */
884 0, /* rightshift */
885 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
886 64, /* bitsize */
887 TRUE, /* pc_relative */
888 0, /* bitpos */
889 complain_overflow_dont, /* complain_on_overflow */
890 ppc64_elf_unhandled_reloc, /* special_function */
891 "R_PPC64_PLTREL64", /* name */
892 FALSE, /* partial_inplace */
893 0, /* src_mask */
894 ONES (64), /* dst_mask */
895 TRUE), /* pcrel_offset */
896
897 /* 16 bit TOC-relative relocation. */
898
899 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */
900 HOWTO (R_PPC64_TOC16, /* type */
901 0, /* rightshift */
902 1, /* size (0 = byte, 1 = short, 2 = long) */
903 16, /* bitsize */
904 FALSE, /* pc_relative */
905 0, /* bitpos */
906 complain_overflow_signed, /* complain_on_overflow */
907 ppc64_elf_toc_reloc, /* special_function */
908 "R_PPC64_TOC16", /* name */
909 FALSE, /* partial_inplace */
910 0, /* src_mask */
911 0xffff, /* dst_mask */
912 FALSE), /* pcrel_offset */
913
914 /* 16 bit TOC-relative relocation without overflow. */
915
916 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */
917 HOWTO (R_PPC64_TOC16_LO, /* type */
918 0, /* rightshift */
919 1, /* size (0 = byte, 1 = short, 2 = long) */
920 16, /* bitsize */
921 FALSE, /* pc_relative */
922 0, /* bitpos */
923 complain_overflow_dont, /* complain_on_overflow */
924 ppc64_elf_toc_reloc, /* special_function */
925 "R_PPC64_TOC16_LO", /* name */
926 FALSE, /* partial_inplace */
927 0, /* src_mask */
928 0xffff, /* dst_mask */
929 FALSE), /* pcrel_offset */
930
931 /* 16 bit TOC-relative relocation, high 16 bits. */
932
933 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */
934 HOWTO (R_PPC64_TOC16_HI, /* type */
935 16, /* rightshift */
936 1, /* size (0 = byte, 1 = short, 2 = long) */
937 16, /* bitsize */
938 FALSE, /* pc_relative */
939 0, /* bitpos */
940 complain_overflow_dont, /* complain_on_overflow */
941 ppc64_elf_toc_reloc, /* special_function */
942 "R_PPC64_TOC16_HI", /* name */
943 FALSE, /* partial_inplace */
944 0, /* src_mask */
945 0xffff, /* dst_mask */
946 FALSE), /* pcrel_offset */
947
948 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the
949 contents of the low 16 bits, treated as a signed number, is
950 negative. */
951
952 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */
953 HOWTO (R_PPC64_TOC16_HA, /* type */
954 16, /* rightshift */
955 1, /* size (0 = byte, 1 = short, 2 = long) */
956 16, /* bitsize */
957 FALSE, /* pc_relative */
958 0, /* bitpos */
959 complain_overflow_dont, /* complain_on_overflow */
960 ppc64_elf_toc_ha_reloc, /* special_function */
961 "R_PPC64_TOC16_HA", /* name */
962 FALSE, /* partial_inplace */
963 0, /* src_mask */
964 0xffff, /* dst_mask */
965 FALSE), /* pcrel_offset */
966
967 /* 64-bit relocation; insert value of TOC base (.TOC.). */
968
969 /* R_PPC64_TOC 51 doubleword64 .TOC. */
970 HOWTO (R_PPC64_TOC, /* type */
971 0, /* rightshift */
972 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */
973 64, /* bitsize */
974 FALSE, /* pc_relative */
975 0, /* bitpos */
976 complain_overflow_bitfield, /* complain_on_overflow */
977 ppc64_elf_toc64_reloc, /* special_function */
978 "R_PPC64_TOC", /* name */
979 FALSE, /* partial_inplace */
980 0, /* src_mask */
981 ONES (64), /* dst_mask */
982 FALSE), /* pcrel_offset */
983
984 /* Like R_PPC64_GOT16, but also informs the link editor that the
985 value to relocate may (!) refer to a PLT entry which the link
986 editor (a) may replace with the symbol value. If the link editor
987 is unable to fully resolve the symbol, it may (b) create a PLT
988 entry and store the address to the new PLT entry in the GOT.
989 This permits lazy resolution of function symbols at run time.
990 The link editor may also skip all of this and just (c) emit a
991 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */
992 /* FIXME: R_PPC64_PLTGOT16 not implemented. */
993 HOWTO (R_PPC64_PLTGOT16, /* type */
994 0, /* rightshift */
995 1, /* size (0 = byte, 1 = short, 2 = long) */
996 16, /* bitsize */
997 FALSE, /* pc_relative */
998 0, /* bitpos */
999 complain_overflow_signed, /* complain_on_overflow */
1000 ppc64_elf_unhandled_reloc, /* special_function */
1001 "R_PPC64_PLTGOT16", /* name */
1002 FALSE, /* partial_inplace */
1003 0, /* src_mask */
1004 0xffff, /* dst_mask */
1005 FALSE), /* pcrel_offset */
1006
1007 /* Like R_PPC64_PLTGOT16, but without overflow. */
1008 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
1009 HOWTO (R_PPC64_PLTGOT16_LO, /* type */
1010 0, /* rightshift */
1011 1, /* size (0 = byte, 1 = short, 2 = long) */
1012 16, /* bitsize */
1013 FALSE, /* pc_relative */
1014 0, /* bitpos */
1015 complain_overflow_dont, /* complain_on_overflow */
1016 ppc64_elf_unhandled_reloc, /* special_function */
1017 "R_PPC64_PLTGOT16_LO", /* name */
1018 FALSE, /* partial_inplace */
1019 0, /* src_mask */
1020 0xffff, /* dst_mask */
1021 FALSE), /* pcrel_offset */
1022
1023 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */
1024 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */
1025 HOWTO (R_PPC64_PLTGOT16_HI, /* type */
1026 16, /* rightshift */
1027 1, /* size (0 = byte, 1 = short, 2 = long) */
1028 16, /* bitsize */
1029 FALSE, /* pc_relative */
1030 0, /* bitpos */
1031 complain_overflow_dont, /* complain_on_overflow */
1032 ppc64_elf_unhandled_reloc, /* special_function */
1033 "R_PPC64_PLTGOT16_HI", /* name */
1034 FALSE, /* partial_inplace */
1035 0, /* src_mask */
1036 0xffff, /* dst_mask */
1037 FALSE), /* pcrel_offset */
1038
1039 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus
1040 1 if the contents of the low 16 bits, treated as a signed number,
1041 is negative. */
1042 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */
1043 HOWTO (R_PPC64_PLTGOT16_HA, /* type */
1044 16, /* rightshift */
1045 1, /* size (0 = byte, 1 = short, 2 = long) */
1046 16, /* bitsize */
1047 FALSE, /* pc_relative */
1048 0, /* bitpos */
1049 complain_overflow_dont,/* complain_on_overflow */
1050 ppc64_elf_unhandled_reloc, /* special_function */
1051 "R_PPC64_PLTGOT16_HA", /* name */
1052 FALSE, /* partial_inplace */
1053 0, /* src_mask */
1054 0xffff, /* dst_mask */
1055 FALSE), /* pcrel_offset */
1056
1057 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */
1058 HOWTO (R_PPC64_ADDR16_DS, /* type */
1059 0, /* rightshift */
1060 1, /* size (0 = byte, 1 = short, 2 = long) */
1061 16, /* bitsize */
1062 FALSE, /* pc_relative */
1063 0, /* bitpos */
1064 complain_overflow_bitfield, /* complain_on_overflow */
1065 bfd_elf_generic_reloc, /* special_function */
1066 "R_PPC64_ADDR16_DS", /* name */
1067 FALSE, /* partial_inplace */
1068 0, /* src_mask */
1069 0xfffc, /* dst_mask */
1070 FALSE), /* pcrel_offset */
1071
1072 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */
1073 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */
1074 0, /* rightshift */
1075 1, /* size (0 = byte, 1 = short, 2 = long) */
1076 16, /* bitsize */
1077 FALSE, /* pc_relative */
1078 0, /* bitpos */
1079 complain_overflow_dont,/* complain_on_overflow */
1080 bfd_elf_generic_reloc, /* special_function */
1081 "R_PPC64_ADDR16_LO_DS",/* name */
1082 FALSE, /* partial_inplace */
1083 0, /* src_mask */
1084 0xfffc, /* dst_mask */
1085 FALSE), /* pcrel_offset */
1086
1087 /* Like R_PPC64_GOT16, but for instructions with a DS field. */
1088 HOWTO (R_PPC64_GOT16_DS, /* type */
1089 0, /* rightshift */
1090 1, /* size (0 = byte, 1 = short, 2 = long) */
1091 16, /* bitsize */
1092 FALSE, /* pc_relative */
1093 0, /* bitpos */
1094 complain_overflow_signed, /* complain_on_overflow */
1095 ppc64_elf_unhandled_reloc, /* special_function */
1096 "R_PPC64_GOT16_DS", /* name */
1097 FALSE, /* partial_inplace */
1098 0, /* src_mask */
1099 0xfffc, /* dst_mask */
1100 FALSE), /* pcrel_offset */
1101
1102 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */
1103 HOWTO (R_PPC64_GOT16_LO_DS, /* type */
1104 0, /* rightshift */
1105 1, /* size (0 = byte, 1 = short, 2 = long) */
1106 16, /* bitsize */
1107 FALSE, /* pc_relative */
1108 0, /* bitpos */
1109 complain_overflow_dont, /* complain_on_overflow */
1110 ppc64_elf_unhandled_reloc, /* special_function */
1111 "R_PPC64_GOT16_LO_DS", /* name */
1112 FALSE, /* partial_inplace */
1113 0, /* src_mask */
1114 0xfffc, /* dst_mask */
1115 FALSE), /* pcrel_offset */
1116
1117 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */
1118 HOWTO (R_PPC64_PLT16_LO_DS, /* type */
1119 0, /* rightshift */
1120 1, /* size (0 = byte, 1 = short, 2 = long) */
1121 16, /* bitsize */
1122 FALSE, /* pc_relative */
1123 0, /* bitpos */
1124 complain_overflow_dont, /* complain_on_overflow */
1125 ppc64_elf_unhandled_reloc, /* special_function */
1126 "R_PPC64_PLT16_LO_DS", /* name */
1127 FALSE, /* partial_inplace */
1128 0, /* src_mask */
1129 0xfffc, /* dst_mask */
1130 FALSE), /* pcrel_offset */
1131
1132 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */
1133 HOWTO (R_PPC64_SECTOFF_DS, /* type */
1134 0, /* rightshift */
1135 1, /* size (0 = byte, 1 = short, 2 = long) */
1136 16, /* bitsize */
1137 FALSE, /* pc_relative */
1138 0, /* bitpos */
1139 complain_overflow_bitfield, /* complain_on_overflow */
1140 ppc64_elf_sectoff_reloc, /* special_function */
1141 "R_PPC64_SECTOFF_DS", /* name */
1142 FALSE, /* partial_inplace */
1143 0, /* src_mask */
1144 0xfffc, /* dst_mask */
1145 FALSE), /* pcrel_offset */
1146
1147 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */
1148 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */
1149 0, /* rightshift */
1150 1, /* size (0 = byte, 1 = short, 2 = long) */
1151 16, /* bitsize */
1152 FALSE, /* pc_relative */
1153 0, /* bitpos */
1154 complain_overflow_dont, /* complain_on_overflow */
1155 ppc64_elf_sectoff_reloc, /* special_function */
1156 "R_PPC64_SECTOFF_LO_DS",/* name */
1157 FALSE, /* partial_inplace */
1158 0, /* src_mask */
1159 0xfffc, /* dst_mask */
1160 FALSE), /* pcrel_offset */
1161
1162 /* Like R_PPC64_TOC16, but for instructions with a DS field. */
1163 HOWTO (R_PPC64_TOC16_DS, /* type */
1164 0, /* rightshift */
1165 1, /* size (0 = byte, 1 = short, 2 = long) */
1166 16, /* bitsize */
1167 FALSE, /* pc_relative */
1168 0, /* bitpos */
1169 complain_overflow_signed, /* complain_on_overflow */
1170 ppc64_elf_toc_reloc, /* special_function */
1171 "R_PPC64_TOC16_DS", /* name */
1172 FALSE, /* partial_inplace */
1173 0, /* src_mask */
1174 0xfffc, /* dst_mask */
1175 FALSE), /* pcrel_offset */
1176
1177 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */
1178 HOWTO (R_PPC64_TOC16_LO_DS, /* type */
1179 0, /* rightshift */
1180 1, /* size (0 = byte, 1 = short, 2 = long) */
1181 16, /* bitsize */
1182 FALSE, /* pc_relative */
1183 0, /* bitpos */
1184 complain_overflow_dont, /* complain_on_overflow */
1185 ppc64_elf_toc_reloc, /* special_function */
1186 "R_PPC64_TOC16_LO_DS", /* name */
1187 FALSE, /* partial_inplace */
1188 0, /* src_mask */
1189 0xfffc, /* dst_mask */
1190 FALSE), /* pcrel_offset */
1191
1192 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */
1193 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */
1194 HOWTO (R_PPC64_PLTGOT16_DS, /* type */
1195 0, /* rightshift */
1196 1, /* size (0 = byte, 1 = short, 2 = long) */
1197 16, /* bitsize */
1198 FALSE, /* pc_relative */
1199 0, /* bitpos */
1200 complain_overflow_signed, /* complain_on_overflow */
1201 ppc64_elf_unhandled_reloc, /* special_function */
1202 "R_PPC64_PLTGOT16_DS", /* name */
1203 FALSE, /* partial_inplace */
1204 0, /* src_mask */
1205 0xfffc, /* dst_mask */
1206 FALSE), /* pcrel_offset */
1207
1208 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */
1209 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */
1210 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */
1211 0, /* rightshift */
1212 1, /* size (0 = byte, 1 = short, 2 = long) */
1213 16, /* bitsize */
1214 FALSE, /* pc_relative */
1215 0, /* bitpos */
1216 complain_overflow_dont, /* complain_on_overflow */
1217 ppc64_elf_unhandled_reloc, /* special_function */
1218 "R_PPC64_PLTGOT16_LO_DS",/* name */
1219 FALSE, /* partial_inplace */
1220 0, /* src_mask */
1221 0xfffc, /* dst_mask */
1222 FALSE), /* pcrel_offset */
1223
1224 /* Marker reloc for TLS. */
1225 HOWTO (R_PPC64_TLS,
1226 0, /* rightshift */
1227 2, /* size (0 = byte, 1 = short, 2 = long) */
1228 32, /* bitsize */
1229 FALSE, /* pc_relative */
1230 0, /* bitpos */
1231 complain_overflow_dont, /* complain_on_overflow */
1232 bfd_elf_generic_reloc, /* special_function */
1233 "R_PPC64_TLS", /* name */
1234 FALSE, /* partial_inplace */
1235 0, /* src_mask */
1236 0, /* dst_mask */
1237 FALSE), /* pcrel_offset */
1238
1239 /* Computes the load module index of the load module that contains the
1240 definition of its TLS sym. */
1241 HOWTO (R_PPC64_DTPMOD64,
1242 0, /* rightshift */
1243 4, /* size (0 = byte, 1 = short, 2 = long) */
1244 64, /* bitsize */
1245 FALSE, /* pc_relative */
1246 0, /* bitpos */
1247 complain_overflow_dont, /* complain_on_overflow */
1248 ppc64_elf_unhandled_reloc, /* special_function */
1249 "R_PPC64_DTPMOD64", /* name */
1250 FALSE, /* partial_inplace */
1251 0, /* src_mask */
1252 ONES (64), /* dst_mask */
1253 FALSE), /* pcrel_offset */
1254
1255 /* Computes a dtv-relative displacement, the difference between the value
1256 of sym+add and the base address of the thread-local storage block that
1257 contains the definition of sym, minus 0x8000. */
1258 HOWTO (R_PPC64_DTPREL64,
1259 0, /* rightshift */
1260 4, /* size (0 = byte, 1 = short, 2 = long) */
1261 64, /* bitsize */
1262 FALSE, /* pc_relative */
1263 0, /* bitpos */
1264 complain_overflow_dont, /* complain_on_overflow */
1265 ppc64_elf_unhandled_reloc, /* special_function */
1266 "R_PPC64_DTPREL64", /* name */
1267 FALSE, /* partial_inplace */
1268 0, /* src_mask */
1269 ONES (64), /* dst_mask */
1270 FALSE), /* pcrel_offset */
1271
1272 /* A 16 bit dtprel reloc. */
1273 HOWTO (R_PPC64_DTPREL16,
1274 0, /* rightshift */
1275 1, /* size (0 = byte, 1 = short, 2 = long) */
1276 16, /* bitsize */
1277 FALSE, /* pc_relative */
1278 0, /* bitpos */
1279 complain_overflow_signed, /* complain_on_overflow */
1280 ppc64_elf_unhandled_reloc, /* special_function */
1281 "R_PPC64_DTPREL16", /* name */
1282 FALSE, /* partial_inplace */
1283 0, /* src_mask */
1284 0xffff, /* dst_mask */
1285 FALSE), /* pcrel_offset */
1286
1287 /* Like DTPREL16, but no overflow. */
1288 HOWTO (R_PPC64_DTPREL16_LO,
1289 0, /* rightshift */
1290 1, /* size (0 = byte, 1 = short, 2 = long) */
1291 16, /* bitsize */
1292 FALSE, /* pc_relative */
1293 0, /* bitpos */
1294 complain_overflow_dont, /* complain_on_overflow */
1295 ppc64_elf_unhandled_reloc, /* special_function */
1296 "R_PPC64_DTPREL16_LO", /* name */
1297 FALSE, /* partial_inplace */
1298 0, /* src_mask */
1299 0xffff, /* dst_mask */
1300 FALSE), /* pcrel_offset */
1301
1302 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1303 HOWTO (R_PPC64_DTPREL16_HI,
1304 16, /* rightshift */
1305 1, /* size (0 = byte, 1 = short, 2 = long) */
1306 16, /* bitsize */
1307 FALSE, /* pc_relative */
1308 0, /* bitpos */
1309 complain_overflow_dont, /* complain_on_overflow */
1310 ppc64_elf_unhandled_reloc, /* special_function */
1311 "R_PPC64_DTPREL16_HI", /* name */
1312 FALSE, /* partial_inplace */
1313 0, /* src_mask */
1314 0xffff, /* dst_mask */
1315 FALSE), /* pcrel_offset */
1316
1317 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1318 HOWTO (R_PPC64_DTPREL16_HA,
1319 16, /* rightshift */
1320 1, /* size (0 = byte, 1 = short, 2 = long) */
1321 16, /* bitsize */
1322 FALSE, /* pc_relative */
1323 0, /* bitpos */
1324 complain_overflow_dont, /* complain_on_overflow */
1325 ppc64_elf_unhandled_reloc, /* special_function */
1326 "R_PPC64_DTPREL16_HA", /* name */
1327 FALSE, /* partial_inplace */
1328 0, /* src_mask */
1329 0xffff, /* dst_mask */
1330 FALSE), /* pcrel_offset */
1331
1332 /* Like DTPREL16_HI, but next higher group of 16 bits. */
1333 HOWTO (R_PPC64_DTPREL16_HIGHER,
1334 32, /* rightshift */
1335 1, /* size (0 = byte, 1 = short, 2 = long) */
1336 16, /* bitsize */
1337 FALSE, /* pc_relative */
1338 0, /* bitpos */
1339 complain_overflow_dont, /* complain_on_overflow */
1340 ppc64_elf_unhandled_reloc, /* special_function */
1341 "R_PPC64_DTPREL16_HIGHER", /* name */
1342 FALSE, /* partial_inplace */
1343 0, /* src_mask */
1344 0xffff, /* dst_mask */
1345 FALSE), /* pcrel_offset */
1346
1347 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */
1348 HOWTO (R_PPC64_DTPREL16_HIGHERA,
1349 32, /* rightshift */
1350 1, /* size (0 = byte, 1 = short, 2 = long) */
1351 16, /* bitsize */
1352 FALSE, /* pc_relative */
1353 0, /* bitpos */
1354 complain_overflow_dont, /* complain_on_overflow */
1355 ppc64_elf_unhandled_reloc, /* special_function */
1356 "R_PPC64_DTPREL16_HIGHERA", /* name */
1357 FALSE, /* partial_inplace */
1358 0, /* src_mask */
1359 0xffff, /* dst_mask */
1360 FALSE), /* pcrel_offset */
1361
1362 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */
1363 HOWTO (R_PPC64_DTPREL16_HIGHEST,
1364 48, /* rightshift */
1365 1, /* size (0 = byte, 1 = short, 2 = long) */
1366 16, /* bitsize */
1367 FALSE, /* pc_relative */
1368 0, /* bitpos */
1369 complain_overflow_dont, /* complain_on_overflow */
1370 ppc64_elf_unhandled_reloc, /* special_function */
1371 "R_PPC64_DTPREL16_HIGHEST", /* name */
1372 FALSE, /* partial_inplace */
1373 0, /* src_mask */
1374 0xffff, /* dst_mask */
1375 FALSE), /* pcrel_offset */
1376
1377 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */
1378 HOWTO (R_PPC64_DTPREL16_HIGHESTA,
1379 48, /* rightshift */
1380 1, /* size (0 = byte, 1 = short, 2 = long) */
1381 16, /* bitsize */
1382 FALSE, /* pc_relative */
1383 0, /* bitpos */
1384 complain_overflow_dont, /* complain_on_overflow */
1385 ppc64_elf_unhandled_reloc, /* special_function */
1386 "R_PPC64_DTPREL16_HIGHESTA", /* name */
1387 FALSE, /* partial_inplace */
1388 0, /* src_mask */
1389 0xffff, /* dst_mask */
1390 FALSE), /* pcrel_offset */
1391
1392 /* Like DTPREL16, but for insns with a DS field. */
1393 HOWTO (R_PPC64_DTPREL16_DS,
1394 0, /* rightshift */
1395 1, /* size (0 = byte, 1 = short, 2 = long) */
1396 16, /* bitsize */
1397 FALSE, /* pc_relative */
1398 0, /* bitpos */
1399 complain_overflow_signed, /* complain_on_overflow */
1400 ppc64_elf_unhandled_reloc, /* special_function */
1401 "R_PPC64_DTPREL16_DS", /* name */
1402 FALSE, /* partial_inplace */
1403 0, /* src_mask */
1404 0xfffc, /* dst_mask */
1405 FALSE), /* pcrel_offset */
1406
1407 /* Like DTPREL16_DS, but no overflow. */
1408 HOWTO (R_PPC64_DTPREL16_LO_DS,
1409 0, /* rightshift */
1410 1, /* size (0 = byte, 1 = short, 2 = long) */
1411 16, /* bitsize */
1412 FALSE, /* pc_relative */
1413 0, /* bitpos */
1414 complain_overflow_dont, /* complain_on_overflow */
1415 ppc64_elf_unhandled_reloc, /* special_function */
1416 "R_PPC64_DTPREL16_LO_DS", /* name */
1417 FALSE, /* partial_inplace */
1418 0, /* src_mask */
1419 0xfffc, /* dst_mask */
1420 FALSE), /* pcrel_offset */
1421
1422 /* Computes a tp-relative displacement, the difference between the value of
1423 sym+add and the value of the thread pointer (r13). */
1424 HOWTO (R_PPC64_TPREL64,
1425 0, /* rightshift */
1426 4, /* size (0 = byte, 1 = short, 2 = long) */
1427 64, /* bitsize */
1428 FALSE, /* pc_relative */
1429 0, /* bitpos */
1430 complain_overflow_dont, /* complain_on_overflow */
1431 ppc64_elf_unhandled_reloc, /* special_function */
1432 "R_PPC64_TPREL64", /* name */
1433 FALSE, /* partial_inplace */
1434 0, /* src_mask */
1435 ONES (64), /* dst_mask */
1436 FALSE), /* pcrel_offset */
1437
1438 /* A 16 bit tprel reloc. */
1439 HOWTO (R_PPC64_TPREL16,
1440 0, /* rightshift */
1441 1, /* size (0 = byte, 1 = short, 2 = long) */
1442 16, /* bitsize */
1443 FALSE, /* pc_relative */
1444 0, /* bitpos */
1445 complain_overflow_signed, /* complain_on_overflow */
1446 ppc64_elf_unhandled_reloc, /* special_function */
1447 "R_PPC64_TPREL16", /* name */
1448 FALSE, /* partial_inplace */
1449 0, /* src_mask */
1450 0xffff, /* dst_mask */
1451 FALSE), /* pcrel_offset */
1452
1453 /* Like TPREL16, but no overflow. */
1454 HOWTO (R_PPC64_TPREL16_LO,
1455 0, /* rightshift */
1456 1, /* size (0 = byte, 1 = short, 2 = long) */
1457 16, /* bitsize */
1458 FALSE, /* pc_relative */
1459 0, /* bitpos */
1460 complain_overflow_dont, /* complain_on_overflow */
1461 ppc64_elf_unhandled_reloc, /* special_function */
1462 "R_PPC64_TPREL16_LO", /* name */
1463 FALSE, /* partial_inplace */
1464 0, /* src_mask */
1465 0xffff, /* dst_mask */
1466 FALSE), /* pcrel_offset */
1467
1468 /* Like TPREL16_LO, but next higher group of 16 bits. */
1469 HOWTO (R_PPC64_TPREL16_HI,
1470 16, /* rightshift */
1471 1, /* size (0 = byte, 1 = short, 2 = long) */
1472 16, /* bitsize */
1473 FALSE, /* pc_relative */
1474 0, /* bitpos */
1475 complain_overflow_dont, /* complain_on_overflow */
1476 ppc64_elf_unhandled_reloc, /* special_function */
1477 "R_PPC64_TPREL16_HI", /* name */
1478 FALSE, /* partial_inplace */
1479 0, /* src_mask */
1480 0xffff, /* dst_mask */
1481 FALSE), /* pcrel_offset */
1482
1483 /* Like TPREL16_HI, but adjust for low 16 bits. */
1484 HOWTO (R_PPC64_TPREL16_HA,
1485 16, /* rightshift */
1486 1, /* size (0 = byte, 1 = short, 2 = long) */
1487 16, /* bitsize */
1488 FALSE, /* pc_relative */
1489 0, /* bitpos */
1490 complain_overflow_dont, /* complain_on_overflow */
1491 ppc64_elf_unhandled_reloc, /* special_function */
1492 "R_PPC64_TPREL16_HA", /* name */
1493 FALSE, /* partial_inplace */
1494 0, /* src_mask */
1495 0xffff, /* dst_mask */
1496 FALSE), /* pcrel_offset */
1497
1498 /* Like TPREL16_HI, but next higher group of 16 bits. */
1499 HOWTO (R_PPC64_TPREL16_HIGHER,
1500 32, /* rightshift */
1501 1, /* size (0 = byte, 1 = short, 2 = long) */
1502 16, /* bitsize */
1503 FALSE, /* pc_relative */
1504 0, /* bitpos */
1505 complain_overflow_dont, /* complain_on_overflow */
1506 ppc64_elf_unhandled_reloc, /* special_function */
1507 "R_PPC64_TPREL16_HIGHER", /* name */
1508 FALSE, /* partial_inplace */
1509 0, /* src_mask */
1510 0xffff, /* dst_mask */
1511 FALSE), /* pcrel_offset */
1512
1513 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */
1514 HOWTO (R_PPC64_TPREL16_HIGHERA,
1515 32, /* rightshift */
1516 1, /* size (0 = byte, 1 = short, 2 = long) */
1517 16, /* bitsize */
1518 FALSE, /* pc_relative */
1519 0, /* bitpos */
1520 complain_overflow_dont, /* complain_on_overflow */
1521 ppc64_elf_unhandled_reloc, /* special_function */
1522 "R_PPC64_TPREL16_HIGHERA", /* name */
1523 FALSE, /* partial_inplace */
1524 0, /* src_mask */
1525 0xffff, /* dst_mask */
1526 FALSE), /* pcrel_offset */
1527
1528 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */
1529 HOWTO (R_PPC64_TPREL16_HIGHEST,
1530 48, /* rightshift */
1531 1, /* size (0 = byte, 1 = short, 2 = long) */
1532 16, /* bitsize */
1533 FALSE, /* pc_relative */
1534 0, /* bitpos */
1535 complain_overflow_dont, /* complain_on_overflow */
1536 ppc64_elf_unhandled_reloc, /* special_function */
1537 "R_PPC64_TPREL16_HIGHEST", /* name */
1538 FALSE, /* partial_inplace */
1539 0, /* src_mask */
1540 0xffff, /* dst_mask */
1541 FALSE), /* pcrel_offset */
1542
1543 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */
1544 HOWTO (R_PPC64_TPREL16_HIGHESTA,
1545 48, /* rightshift */
1546 1, /* size (0 = byte, 1 = short, 2 = long) */
1547 16, /* bitsize */
1548 FALSE, /* pc_relative */
1549 0, /* bitpos */
1550 complain_overflow_dont, /* complain_on_overflow */
1551 ppc64_elf_unhandled_reloc, /* special_function */
1552 "R_PPC64_TPREL16_HIGHESTA", /* name */
1553 FALSE, /* partial_inplace */
1554 0, /* src_mask */
1555 0xffff, /* dst_mask */
1556 FALSE), /* pcrel_offset */
1557
1558 /* Like TPREL16, but for insns with a DS field. */
1559 HOWTO (R_PPC64_TPREL16_DS,
1560 0, /* rightshift */
1561 1, /* size (0 = byte, 1 = short, 2 = long) */
1562 16, /* bitsize */
1563 FALSE, /* pc_relative */
1564 0, /* bitpos */
1565 complain_overflow_signed, /* complain_on_overflow */
1566 ppc64_elf_unhandled_reloc, /* special_function */
1567 "R_PPC64_TPREL16_DS", /* name */
1568 FALSE, /* partial_inplace */
1569 0, /* src_mask */
1570 0xfffc, /* dst_mask */
1571 FALSE), /* pcrel_offset */
1572
1573 /* Like TPREL16_DS, but no overflow. */
1574 HOWTO (R_PPC64_TPREL16_LO_DS,
1575 0, /* rightshift */
1576 1, /* size (0 = byte, 1 = short, 2 = long) */
1577 16, /* bitsize */
1578 FALSE, /* pc_relative */
1579 0, /* bitpos */
1580 complain_overflow_dont, /* complain_on_overflow */
1581 ppc64_elf_unhandled_reloc, /* special_function */
1582 "R_PPC64_TPREL16_LO_DS", /* name */
1583 FALSE, /* partial_inplace */
1584 0, /* src_mask */
1585 0xfffc, /* dst_mask */
1586 FALSE), /* pcrel_offset */
1587
1588 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1589 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1590 to the first entry relative to the TOC base (r2). */
1591 HOWTO (R_PPC64_GOT_TLSGD16,
1592 0, /* rightshift */
1593 1, /* size (0 = byte, 1 = short, 2 = long) */
1594 16, /* bitsize */
1595 FALSE, /* pc_relative */
1596 0, /* bitpos */
1597 complain_overflow_signed, /* complain_on_overflow */
1598 ppc64_elf_unhandled_reloc, /* special_function */
1599 "R_PPC64_GOT_TLSGD16", /* name */
1600 FALSE, /* partial_inplace */
1601 0, /* src_mask */
1602 0xffff, /* dst_mask */
1603 FALSE), /* pcrel_offset */
1604
1605 /* Like GOT_TLSGD16, but no overflow. */
1606 HOWTO (R_PPC64_GOT_TLSGD16_LO,
1607 0, /* rightshift */
1608 1, /* size (0 = byte, 1 = short, 2 = long) */
1609 16, /* bitsize */
1610 FALSE, /* pc_relative */
1611 0, /* bitpos */
1612 complain_overflow_dont, /* complain_on_overflow */
1613 ppc64_elf_unhandled_reloc, /* special_function */
1614 "R_PPC64_GOT_TLSGD16_LO", /* name */
1615 FALSE, /* partial_inplace */
1616 0, /* src_mask */
1617 0xffff, /* dst_mask */
1618 FALSE), /* pcrel_offset */
1619
1620 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1621 HOWTO (R_PPC64_GOT_TLSGD16_HI,
1622 16, /* rightshift */
1623 1, /* size (0 = byte, 1 = short, 2 = long) */
1624 16, /* bitsize */
1625 FALSE, /* pc_relative */
1626 0, /* bitpos */
1627 complain_overflow_dont, /* complain_on_overflow */
1628 ppc64_elf_unhandled_reloc, /* special_function */
1629 "R_PPC64_GOT_TLSGD16_HI", /* name */
1630 FALSE, /* partial_inplace */
1631 0, /* src_mask */
1632 0xffff, /* dst_mask */
1633 FALSE), /* pcrel_offset */
1634
1635 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1636 HOWTO (R_PPC64_GOT_TLSGD16_HA,
1637 16, /* rightshift */
1638 1, /* size (0 = byte, 1 = short, 2 = long) */
1639 16, /* bitsize */
1640 FALSE, /* pc_relative */
1641 0, /* bitpos */
1642 complain_overflow_dont, /* complain_on_overflow */
1643 ppc64_elf_unhandled_reloc, /* special_function */
1644 "R_PPC64_GOT_TLSGD16_HA", /* name */
1645 FALSE, /* partial_inplace */
1646 0, /* src_mask */
1647 0xffff, /* dst_mask */
1648 FALSE), /* pcrel_offset */
1649
1650 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1651 with values (sym+add)@dtpmod and zero, and computes the offset to the
1652 first entry relative to the TOC base (r2). */
1653 HOWTO (R_PPC64_GOT_TLSLD16,
1654 0, /* rightshift */
1655 1, /* size (0 = byte, 1 = short, 2 = long) */
1656 16, /* bitsize */
1657 FALSE, /* pc_relative */
1658 0, /* bitpos */
1659 complain_overflow_signed, /* complain_on_overflow */
1660 ppc64_elf_unhandled_reloc, /* special_function */
1661 "R_PPC64_GOT_TLSLD16", /* name */
1662 FALSE, /* partial_inplace */
1663 0, /* src_mask */
1664 0xffff, /* dst_mask */
1665 FALSE), /* pcrel_offset */
1666
1667 /* Like GOT_TLSLD16, but no overflow. */
1668 HOWTO (R_PPC64_GOT_TLSLD16_LO,
1669 0, /* rightshift */
1670 1, /* size (0 = byte, 1 = short, 2 = long) */
1671 16, /* bitsize */
1672 FALSE, /* pc_relative */
1673 0, /* bitpos */
1674 complain_overflow_dont, /* complain_on_overflow */
1675 ppc64_elf_unhandled_reloc, /* special_function */
1676 "R_PPC64_GOT_TLSLD16_LO", /* name */
1677 FALSE, /* partial_inplace */
1678 0, /* src_mask */
1679 0xffff, /* dst_mask */
1680 FALSE), /* pcrel_offset */
1681
1682 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1683 HOWTO (R_PPC64_GOT_TLSLD16_HI,
1684 16, /* rightshift */
1685 1, /* size (0 = byte, 1 = short, 2 = long) */
1686 16, /* bitsize */
1687 FALSE, /* pc_relative */
1688 0, /* bitpos */
1689 complain_overflow_dont, /* complain_on_overflow */
1690 ppc64_elf_unhandled_reloc, /* special_function */
1691 "R_PPC64_GOT_TLSLD16_HI", /* name */
1692 FALSE, /* partial_inplace */
1693 0, /* src_mask */
1694 0xffff, /* dst_mask */
1695 FALSE), /* pcrel_offset */
1696
1697 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1698 HOWTO (R_PPC64_GOT_TLSLD16_HA,
1699 16, /* rightshift */
1700 1, /* size (0 = byte, 1 = short, 2 = long) */
1701 16, /* bitsize */
1702 FALSE, /* pc_relative */
1703 0, /* bitpos */
1704 complain_overflow_dont, /* complain_on_overflow */
1705 ppc64_elf_unhandled_reloc, /* special_function */
1706 "R_PPC64_GOT_TLSLD16_HA", /* name */
1707 FALSE, /* partial_inplace */
1708 0, /* src_mask */
1709 0xffff, /* dst_mask */
1710 FALSE), /* pcrel_offset */
1711
1712 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1713 the offset to the entry relative to the TOC base (r2). */
1714 HOWTO (R_PPC64_GOT_DTPREL16_DS,
1715 0, /* rightshift */
1716 1, /* size (0 = byte, 1 = short, 2 = long) */
1717 16, /* bitsize */
1718 FALSE, /* pc_relative */
1719 0, /* bitpos */
1720 complain_overflow_signed, /* complain_on_overflow */
1721 ppc64_elf_unhandled_reloc, /* special_function */
1722 "R_PPC64_GOT_DTPREL16_DS", /* name */
1723 FALSE, /* partial_inplace */
1724 0, /* src_mask */
1725 0xfffc, /* dst_mask */
1726 FALSE), /* pcrel_offset */
1727
1728 /* Like GOT_DTPREL16_DS, but no overflow. */
1729 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS,
1730 0, /* rightshift */
1731 1, /* size (0 = byte, 1 = short, 2 = long) */
1732 16, /* bitsize */
1733 FALSE, /* pc_relative */
1734 0, /* bitpos */
1735 complain_overflow_dont, /* complain_on_overflow */
1736 ppc64_elf_unhandled_reloc, /* special_function */
1737 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */
1738 FALSE, /* partial_inplace */
1739 0, /* src_mask */
1740 0xfffc, /* dst_mask */
1741 FALSE), /* pcrel_offset */
1742
1743 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */
1744 HOWTO (R_PPC64_GOT_DTPREL16_HI,
1745 16, /* rightshift */
1746 1, /* size (0 = byte, 1 = short, 2 = long) */
1747 16, /* bitsize */
1748 FALSE, /* pc_relative */
1749 0, /* bitpos */
1750 complain_overflow_dont, /* complain_on_overflow */
1751 ppc64_elf_unhandled_reloc, /* special_function */
1752 "R_PPC64_GOT_DTPREL16_HI", /* name */
1753 FALSE, /* partial_inplace */
1754 0, /* src_mask */
1755 0xffff, /* dst_mask */
1756 FALSE), /* pcrel_offset */
1757
1758 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1759 HOWTO (R_PPC64_GOT_DTPREL16_HA,
1760 16, /* rightshift */
1761 1, /* size (0 = byte, 1 = short, 2 = long) */
1762 16, /* bitsize */
1763 FALSE, /* pc_relative */
1764 0, /* bitpos */
1765 complain_overflow_dont, /* complain_on_overflow */
1766 ppc64_elf_unhandled_reloc, /* special_function */
1767 "R_PPC64_GOT_DTPREL16_HA", /* name */
1768 FALSE, /* partial_inplace */
1769 0, /* src_mask */
1770 0xffff, /* dst_mask */
1771 FALSE), /* pcrel_offset */
1772
1773 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1774 offset to the entry relative to the TOC base (r2). */
1775 HOWTO (R_PPC64_GOT_TPREL16_DS,
1776 0, /* rightshift */
1777 1, /* size (0 = byte, 1 = short, 2 = long) */
1778 16, /* bitsize */
1779 FALSE, /* pc_relative */
1780 0, /* bitpos */
1781 complain_overflow_signed, /* complain_on_overflow */
1782 ppc64_elf_unhandled_reloc, /* special_function */
1783 "R_PPC64_GOT_TPREL16_DS", /* name */
1784 FALSE, /* partial_inplace */
1785 0, /* src_mask */
1786 0xfffc, /* dst_mask */
1787 FALSE), /* pcrel_offset */
1788
1789 /* Like GOT_TPREL16_DS, but no overflow. */
1790 HOWTO (R_PPC64_GOT_TPREL16_LO_DS,
1791 0, /* rightshift */
1792 1, /* size (0 = byte, 1 = short, 2 = long) */
1793 16, /* bitsize */
1794 FALSE, /* pc_relative */
1795 0, /* bitpos */
1796 complain_overflow_dont, /* complain_on_overflow */
1797 ppc64_elf_unhandled_reloc, /* special_function */
1798 "R_PPC64_GOT_TPREL16_LO_DS", /* name */
1799 FALSE, /* partial_inplace */
1800 0, /* src_mask */
1801 0xfffc, /* dst_mask */
1802 FALSE), /* pcrel_offset */
1803
1804 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */
1805 HOWTO (R_PPC64_GOT_TPREL16_HI,
1806 16, /* rightshift */
1807 1, /* size (0 = byte, 1 = short, 2 = long) */
1808 16, /* bitsize */
1809 FALSE, /* pc_relative */
1810 0, /* bitpos */
1811 complain_overflow_dont, /* complain_on_overflow */
1812 ppc64_elf_unhandled_reloc, /* special_function */
1813 "R_PPC64_GOT_TPREL16_HI", /* name */
1814 FALSE, /* partial_inplace */
1815 0, /* src_mask */
1816 0xffff, /* dst_mask */
1817 FALSE), /* pcrel_offset */
1818
1819 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1820 HOWTO (R_PPC64_GOT_TPREL16_HA,
1821 16, /* rightshift */
1822 1, /* size (0 = byte, 1 = short, 2 = long) */
1823 16, /* bitsize */
1824 FALSE, /* pc_relative */
1825 0, /* bitpos */
1826 complain_overflow_dont, /* complain_on_overflow */
1827 ppc64_elf_unhandled_reloc, /* special_function */
1828 "R_PPC64_GOT_TPREL16_HA", /* name */
1829 FALSE, /* partial_inplace */
1830 0, /* src_mask */
1831 0xffff, /* dst_mask */
1832 FALSE), /* pcrel_offset */
1833
1834 /* GNU extension to record C++ vtable hierarchy. */
1835 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */
1836 0, /* rightshift */
1837 0, /* size (0 = byte, 1 = short, 2 = long) */
1838 0, /* bitsize */
1839 FALSE, /* pc_relative */
1840 0, /* bitpos */
1841 complain_overflow_dont, /* complain_on_overflow */
1842 NULL, /* special_function */
1843 "R_PPC64_GNU_VTINHERIT", /* name */
1844 FALSE, /* partial_inplace */
1845 0, /* src_mask */
1846 0, /* dst_mask */
1847 FALSE), /* pcrel_offset */
1848
1849 /* GNU extension to record C++ vtable member usage. */
1850 HOWTO (R_PPC64_GNU_VTENTRY, /* type */
1851 0, /* rightshift */
1852 0, /* size (0 = byte, 1 = short, 2 = long) */
1853 0, /* bitsize */
1854 FALSE, /* pc_relative */
1855 0, /* bitpos */
1856 complain_overflow_dont, /* complain_on_overflow */
1857 NULL, /* special_function */
1858 "R_PPC64_GNU_VTENTRY", /* name */
1859 FALSE, /* partial_inplace */
1860 0, /* src_mask */
1861 0, /* dst_mask */
1862 FALSE), /* pcrel_offset */
1863 };
1864
1865
1866 /* Initialize the ppc64_elf_howto_table, so that linear accesses can
1867 be done. */
1868
1869 static void
ppc_howto_init(void)1870 ppc_howto_init (void)
1871 {
1872 unsigned int i, type;
1873
1874 for (i = 0;
1875 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]);
1876 i++)
1877 {
1878 type = ppc64_elf_howto_raw[i].type;
1879 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table)
1880 / sizeof (ppc64_elf_howto_table[0])));
1881 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i];
1882 }
1883 }
1884
1885 static reloc_howto_type *
ppc64_elf_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)1886 ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
1887 bfd_reloc_code_real_type code)
1888 {
1889 enum elf_ppc64_reloc_type r = R_PPC64_NONE;
1890
1891 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
1892 /* Initialize howto table if needed. */
1893 ppc_howto_init ();
1894
1895 switch (code)
1896 {
1897 default:
1898 return NULL;
1899
1900 case BFD_RELOC_NONE: r = R_PPC64_NONE;
1901 break;
1902 case BFD_RELOC_32: r = R_PPC64_ADDR32;
1903 break;
1904 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24;
1905 break;
1906 case BFD_RELOC_16: r = R_PPC64_ADDR16;
1907 break;
1908 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO;
1909 break;
1910 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI;
1911 break;
1912 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA;
1913 break;
1914 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14;
1915 break;
1916 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN;
1917 break;
1918 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN;
1919 break;
1920 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24;
1921 break;
1922 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14;
1923 break;
1924 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN;
1925 break;
1926 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN;
1927 break;
1928 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16;
1929 break;
1930 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO;
1931 break;
1932 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI;
1933 break;
1934 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA;
1935 break;
1936 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY;
1937 break;
1938 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT;
1939 break;
1940 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32;
1941 break;
1942 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32;
1943 break;
1944 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32;
1945 break;
1946 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO;
1947 break;
1948 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI;
1949 break;
1950 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA;
1951 break;
1952 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF;
1953 break;
1954 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO;
1955 break;
1956 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI;
1957 break;
1958 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA;
1959 break;
1960 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64;
1961 break;
1962 case BFD_RELOC_64: r = R_PPC64_ADDR64;
1963 break;
1964 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER;
1965 break;
1966 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA;
1967 break;
1968 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST;
1969 break;
1970 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA;
1971 break;
1972 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64;
1973 break;
1974 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64;
1975 break;
1976 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64;
1977 break;
1978 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16;
1979 break;
1980 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO;
1981 break;
1982 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI;
1983 break;
1984 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA;
1985 break;
1986 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC;
1987 break;
1988 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16;
1989 break;
1990 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO;
1991 break;
1992 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI;
1993 break;
1994 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA;
1995 break;
1996 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS;
1997 break;
1998 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS;
1999 break;
2000 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS;
2001 break;
2002 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS;
2003 break;
2004 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS;
2005 break;
2006 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS;
2007 break;
2008 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS;
2009 break;
2010 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS;
2011 break;
2012 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS;
2013 break;
2014 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS;
2015 break;
2016 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS;
2017 break;
2018 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS;
2019 break;
2020 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64;
2021 break;
2022 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16;
2023 break;
2024 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO;
2025 break;
2026 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI;
2027 break;
2028 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA;
2029 break;
2030 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64;
2031 break;
2032 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16;
2033 break;
2034 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO;
2035 break;
2036 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI;
2037 break;
2038 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA;
2039 break;
2040 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64;
2041 break;
2042 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16;
2043 break;
2044 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO;
2045 break;
2046 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI;
2047 break;
2048 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA;
2049 break;
2050 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16;
2051 break;
2052 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO;
2053 break;
2054 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI;
2055 break;
2056 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA;
2057 break;
2058 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS;
2059 break;
2060 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS;
2061 break;
2062 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI;
2063 break;
2064 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA;
2065 break;
2066 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS;
2067 break;
2068 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS;
2069 break;
2070 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI;
2071 break;
2072 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA;
2073 break;
2074 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS;
2075 break;
2076 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS;
2077 break;
2078 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER;
2079 break;
2080 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA;
2081 break;
2082 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST;
2083 break;
2084 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA;
2085 break;
2086 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS;
2087 break;
2088 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS;
2089 break;
2090 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER;
2091 break;
2092 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA;
2093 break;
2094 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST;
2095 break;
2096 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA;
2097 break;
2098 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT;
2099 break;
2100 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY;
2101 break;
2102 }
2103
2104 return ppc64_elf_howto_table[r];
2105 };
2106
2107 /* Set the howto pointer for a PowerPC ELF reloc. */
2108
2109 static void
ppc64_elf_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)2110 ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
2111 Elf_Internal_Rela *dst)
2112 {
2113 unsigned int type;
2114
2115 /* Initialize howto table if needed. */
2116 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
2117 ppc_howto_init ();
2118
2119 type = ELF64_R_TYPE (dst->r_info);
2120 if (type >= (sizeof (ppc64_elf_howto_table)
2121 / sizeof (ppc64_elf_howto_table[0])))
2122 {
2123 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
2124 abfd, (int) type);
2125 type = R_PPC64_NONE;
2126 }
2127 cache_ptr->howto = ppc64_elf_howto_table[type];
2128 }
2129
2130 /* Handle the R_PPC64_ADDR16_HA and similar relocs. */
2131
2132 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)2133 ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2134 void *data, asection *input_section,
2135 bfd *output_bfd, char **error_message)
2136 {
2137 /* If this is a relocatable link (output_bfd test tells us), just
2138 call the generic function. Any adjustment will be done at final
2139 link time. */
2140 if (output_bfd != NULL)
2141 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2142 input_section, output_bfd, error_message);
2143
2144 /* Adjust the addend for sign extension of the low 16 bits.
2145 We won't actually be using the low 16 bits, so trashing them
2146 doesn't matter. */
2147 reloc_entry->addend += 0x8000;
2148 return bfd_reloc_continue;
2149 }
2150
2151 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)2152 ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2153 void *data, asection *input_section,
2154 bfd *output_bfd, char **error_message)
2155 {
2156 if (output_bfd != NULL)
2157 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2158 input_section, output_bfd, error_message);
2159
2160 if (strcmp (symbol->section->name, ".opd") == 0
2161 && (symbol->section->owner->flags & DYNAMIC) == 0)
2162 {
2163 bfd_vma dest = opd_entry_value (symbol->section,
2164 symbol->value + reloc_entry->addend,
2165 NULL, NULL);
2166 if (dest != (bfd_vma) -1)
2167 reloc_entry->addend = dest - (symbol->value
2168 + symbol->section->output_section->vma
2169 + symbol->section->output_offset);
2170 }
2171 return bfd_reloc_continue;
2172 }
2173
2174 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)2175 ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2176 void *data, asection *input_section,
2177 bfd *output_bfd, char **error_message)
2178 {
2179 long insn;
2180 enum elf_ppc64_reloc_type r_type;
2181 bfd_size_type octets;
2182 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
2183 bfd_boolean is_power4 = FALSE;
2184
2185 /* If this is a relocatable link (output_bfd test tells us), just
2186 call the generic function. Any adjustment will be done at final
2187 link time. */
2188 if (output_bfd != NULL)
2189 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2190 input_section, output_bfd, error_message);
2191
2192 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
2193 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets);
2194 insn &= ~(0x01 << 21);
2195 r_type = reloc_entry->howto->type;
2196 if (r_type == R_PPC64_ADDR14_BRTAKEN
2197 || r_type == R_PPC64_REL14_BRTAKEN)
2198 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
2199
2200 if (is_power4)
2201 {
2202 /* Set 'a' bit. This is 0b00010 in BO field for branch
2203 on CR(BI) insns (BO == 001at or 011at), and 0b01000
2204 for branch on CTR insns (BO == 1a00t or 1a01t). */
2205 if ((insn & (0x14 << 21)) == (0x04 << 21))
2206 insn |= 0x02 << 21;
2207 else if ((insn & (0x14 << 21)) == (0x10 << 21))
2208 insn |= 0x08 << 21;
2209 else
2210 goto out;
2211 }
2212 else
2213 {
2214 bfd_vma target = 0;
2215 bfd_vma from;
2216
2217 if (!bfd_is_com_section (symbol->section))
2218 target = symbol->value;
2219 target += symbol->section->output_section->vma;
2220 target += symbol->section->output_offset;
2221 target += reloc_entry->addend;
2222
2223 from = (reloc_entry->address
2224 + input_section->output_offset
2225 + input_section->output_section->vma);
2226
2227 /* Invert 'y' bit if not the default. */
2228 if ((bfd_signed_vma) (target - from) < 0)
2229 insn ^= 0x01 << 21;
2230 }
2231 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets);
2232 out:
2233 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data,
2234 input_section, output_bfd, error_message);
2235 }
2236
2237 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)2238 ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2239 void *data, asection *input_section,
2240 bfd *output_bfd, char **error_message)
2241 {
2242 /* If this is a relocatable link (output_bfd test tells us), just
2243 call the generic function. Any adjustment will be done at final
2244 link time. */
2245 if (output_bfd != NULL)
2246 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2247 input_section, output_bfd, error_message);
2248
2249 /* Subtract the symbol section base address. */
2250 reloc_entry->addend -= symbol->section->output_section->vma;
2251 return bfd_reloc_continue;
2252 }
2253
2254 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)2255 ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2256 void *data, asection *input_section,
2257 bfd *output_bfd, char **error_message)
2258 {
2259 /* If this is a relocatable link (output_bfd test tells us), just
2260 call the generic function. Any adjustment will be done at final
2261 link time. */
2262 if (output_bfd != NULL)
2263 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2264 input_section, output_bfd, error_message);
2265
2266 /* Subtract the symbol section base address. */
2267 reloc_entry->addend -= symbol->section->output_section->vma;
2268
2269 /* Adjust the addend for sign extension of the low 16 bits. */
2270 reloc_entry->addend += 0x8000;
2271 return bfd_reloc_continue;
2272 }
2273
2274 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)2275 ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2276 void *data, asection *input_section,
2277 bfd *output_bfd, char **error_message)
2278 {
2279 bfd_vma TOCstart;
2280
2281 /* If this is a relocatable link (output_bfd test tells us), just
2282 call the generic function. Any adjustment will be done at final
2283 link time. */
2284 if (output_bfd != NULL)
2285 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2286 input_section, output_bfd, error_message);
2287
2288 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2289 if (TOCstart == 0)
2290 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2291
2292 /* Subtract the TOC base address. */
2293 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
2294 return bfd_reloc_continue;
2295 }
2296
2297 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)2298 ppc64_elf_toc_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2299 void *data, asection *input_section,
2300 bfd *output_bfd, char **error_message)
2301 {
2302 bfd_vma TOCstart;
2303
2304 /* If this is a relocatable link (output_bfd test tells us), just
2305 call the generic function. Any adjustment will be done at final
2306 link time. */
2307 if (output_bfd != NULL)
2308 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2309 input_section, output_bfd, error_message);
2310
2311 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2312 if (TOCstart == 0)
2313 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2314
2315 /* Subtract the TOC base address. */
2316 reloc_entry->addend -= TOCstart + TOC_BASE_OFF;
2317
2318 /* Adjust the addend for sign extension of the low 16 bits. */
2319 reloc_entry->addend += 0x8000;
2320 return bfd_reloc_continue;
2321 }
2322
2323 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)2324 ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2325 void *data, asection *input_section,
2326 bfd *output_bfd, char **error_message)
2327 {
2328 bfd_vma TOCstart;
2329 bfd_size_type octets;
2330
2331 /* If this is a relocatable link (output_bfd test tells us), just
2332 call the generic function. Any adjustment will be done at final
2333 link time. */
2334 if (output_bfd != NULL)
2335 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2336 input_section, output_bfd, error_message);
2337
2338 TOCstart = _bfd_get_gp_value (input_section->output_section->owner);
2339 if (TOCstart == 0)
2340 TOCstart = ppc64_elf_toc (input_section->output_section->owner);
2341
2342 octets = reloc_entry->address * bfd_octets_per_byte (abfd);
2343 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets);
2344 return bfd_reloc_ok;
2345 }
2346
2347 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)2348 ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
2349 void *data, asection *input_section,
2350 bfd *output_bfd, char **error_message)
2351 {
2352 /* If this is a relocatable link (output_bfd test tells us), just
2353 call the generic function. Any adjustment will be done at final
2354 link time. */
2355 if (output_bfd != NULL)
2356 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
2357 input_section, output_bfd, error_message);
2358
2359 if (error_message != NULL)
2360 {
2361 static char buf[60];
2362 sprintf (buf, "generic linker can't handle %s",
2363 reloc_entry->howto->name);
2364 *error_message = buf;
2365 }
2366 return bfd_reloc_dangerous;
2367 }
2368
2369 struct ppc64_elf_obj_tdata
2370 {
2371 struct elf_obj_tdata elf;
2372
2373 /* Shortcuts to dynamic linker sections. */
2374 asection *got;
2375 asection *relgot;
2376
2377 union {
2378 /* Used during garbage collection. We attach global symbols defined
2379 on removed .opd entries to this section so that the sym is removed. */
2380 asection *deleted_section;
2381
2382 /* Used when adding symbols. */
2383 bfd_boolean has_dotsym;
2384 } u;
2385
2386 /* TLS local dynamic got entry handling. Suppose for multiple GOT
2387 sections means we potentially need one of these for each input bfd. */
2388 union {
2389 bfd_signed_vma refcount;
2390 bfd_vma offset;
2391 } tlsld_got;
2392
2393 /* A copy of relocs before they are modified for --emit-relocs. */
2394 Elf_Internal_Rela *opd_relocs;
2395 };
2396
2397 #define ppc64_elf_tdata(bfd) \
2398 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any)
2399
2400 #define ppc64_tlsld_got(bfd) \
2401 (&ppc64_elf_tdata (bfd)->tlsld_got)
2402
2403 /* Override the generic function because we store some extras. */
2404
2405 static bfd_boolean
ppc64_elf_mkobject(bfd * abfd)2406 ppc64_elf_mkobject (bfd *abfd)
2407 {
2408 bfd_size_type amt = sizeof (struct ppc64_elf_obj_tdata);
2409 abfd->tdata.any = bfd_zalloc (abfd, amt);
2410 if (abfd->tdata.any == NULL)
2411 return FALSE;
2412 return TRUE;
2413 }
2414
2415 /* Return 1 if target is one of ours. */
2416
2417 static bfd_boolean
is_ppc64_elf_target(const struct bfd_target * targ)2418 is_ppc64_elf_target (const struct bfd_target *targ)
2419 {
2420 extern const bfd_target bfd_elf64_powerpc_vec;
2421 extern const bfd_target bfd_elf64_powerpcle_vec;
2422
2423 return targ == &bfd_elf64_powerpc_vec || targ == &bfd_elf64_powerpcle_vec;
2424 }
2425
2426 /* Fix bad default arch selected for a 64 bit input bfd when the
2427 default is 32 bit. */
2428
2429 static bfd_boolean
ppc64_elf_object_p(bfd * abfd)2430 ppc64_elf_object_p (bfd *abfd)
2431 {
2432 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32)
2433 {
2434 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd);
2435
2436 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64)
2437 {
2438 /* Relies on arch after 32 bit default being 64 bit default. */
2439 abfd->arch_info = abfd->arch_info->next;
2440 BFD_ASSERT (abfd->arch_info->bits_per_word == 64);
2441 }
2442 }
2443 return TRUE;
2444 }
2445
2446 /* Support for core dump NOTE sections. */
2447
2448 static bfd_boolean
ppc64_elf_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)2449 ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2450 {
2451 size_t offset, size;
2452
2453 if (note->descsz != 504)
2454 return FALSE;
2455
2456 /* pr_cursig */
2457 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2458
2459 /* pr_pid */
2460 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 32);
2461
2462 /* pr_reg */
2463 offset = 112;
2464 size = 384;
2465
2466 /* Make a ".reg/999" section. */
2467 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2468 size, note->descpos + offset);
2469 }
2470
2471 static bfd_boolean
ppc64_elf_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)2472 ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
2473 {
2474 if (note->descsz != 136)
2475 return FALSE;
2476
2477 elf_tdata (abfd)->core_program
2478 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
2479 elf_tdata (abfd)->core_command
2480 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
2481
2482 return TRUE;
2483 }
2484
2485 /* Merge backend specific data from an object file to the output
2486 object file when linking. */
2487
2488 static bfd_boolean
ppc64_elf_merge_private_bfd_data(bfd * ibfd,bfd * obfd)2489 ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
2490 {
2491 /* Check if we have the same endianess. */
2492 if (ibfd->xvec->byteorder != obfd->xvec->byteorder
2493 && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN
2494 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
2495 {
2496 const char *msg;
2497
2498 if (bfd_big_endian (ibfd))
2499 msg = _("%B: compiled for a big endian system "
2500 "and target is little endian");
2501 else
2502 msg = _("%B: compiled for a little endian system "
2503 "and target is big endian");
2504
2505 (*_bfd_error_handler) (msg, ibfd);
2506
2507 bfd_set_error (bfd_error_wrong_format);
2508 return FALSE;
2509 }
2510
2511 return TRUE;
2512 }
2513
2514 /* Add extra PPC sections. */
2515
2516 static const struct bfd_elf_special_section ppc64_elf_special_sections[]=
2517 {
2518 { ".plt", 4, 0, SHT_NOBITS, 0 },
2519 { ".sbss", 5, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
2520 { ".sdata", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2521 { ".toc", 4, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2522 { ".toc1", 5, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
2523 { ".tocbss", 7, 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
2524 { NULL, 0, 0, 0, 0 }
2525 };
2526
2527 static const struct bfd_elf_special_section *
ppc64_elf_get_sec_type_attr(bfd * abfd,asection * sec)2528 ppc64_elf_get_sec_type_attr (bfd *abfd, asection *sec)
2529 {
2530 const struct bfd_elf_special_section *ssect;
2531
2532 /* See if this is one of the special sections. */
2533 if (sec->name == NULL)
2534 return NULL;
2535
2536 ssect = _bfd_elf_get_special_section (sec->name,
2537 ppc64_elf_special_sections,
2538 sec->use_rela_p);
2539 if (ssect != NULL)
2540 return ssect;
2541
2542 return _bfd_elf_get_sec_type_attr (abfd, sec);
2543 }
2544
2545 struct _ppc64_elf_section_data
2546 {
2547 struct bfd_elf_section_data elf;
2548
2549 /* An array with one entry for each opd function descriptor. */
2550 union
2551 {
2552 /* Points to the function code section for local opd entries. */
2553 asection **func_sec;
2554 /* After editing .opd, adjust references to opd local syms. */
2555 long *adjust;
2556 } opd;
2557
2558 /* An array for toc sections, indexed by offset/8.
2559 Specifies the relocation symbol index used at a given toc offset. */
2560 unsigned *t_symndx;
2561 };
2562
2563 #define ppc64_elf_section_data(sec) \
2564 ((struct _ppc64_elf_section_data *) elf_section_data (sec))
2565
2566 static bfd_boolean
ppc64_elf_new_section_hook(bfd * abfd,asection * sec)2567 ppc64_elf_new_section_hook (bfd *abfd, asection *sec)
2568 {
2569 struct _ppc64_elf_section_data *sdata;
2570 bfd_size_type amt = sizeof (*sdata);
2571
2572 sdata = bfd_zalloc (abfd, amt);
2573 if (sdata == NULL)
2574 return FALSE;
2575 sec->used_by_bfd = sdata;
2576
2577 return _bfd_elf_new_section_hook (abfd, sec);
2578 }
2579
2580 static void *
get_opd_info(asection * sec)2581 get_opd_info (asection * sec)
2582 {
2583 if (sec != NULL
2584 && ppc64_elf_section_data (sec) != NULL
2585 && ppc64_elf_section_data (sec)->opd.adjust != NULL)
2586 return ppc64_elf_section_data (sec)->opd.adjust;
2587 return NULL;
2588 }
2589
2590 /* Parameters for the qsort hook. */
2591 static asection *synthetic_opd;
2592 static bfd_boolean synthetic_relocatable;
2593
2594 /* qsort comparison function for ppc64_elf_get_synthetic_symtab. */
2595
2596 static int
compare_symbols(const void * ap,const void * bp)2597 compare_symbols (const void *ap, const void *bp)
2598 {
2599 const asymbol *a = * (const asymbol **) ap;
2600 const asymbol *b = * (const asymbol **) bp;
2601
2602 /* Section symbols first. */
2603 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM))
2604 return -1;
2605 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM))
2606 return 1;
2607
2608 /* then .opd symbols. */
2609 if (a->section == synthetic_opd && b->section != synthetic_opd)
2610 return -1;
2611 if (a->section != synthetic_opd && b->section == synthetic_opd)
2612 return 1;
2613
2614 /* then other code symbols. */
2615 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2616 == (SEC_CODE | SEC_ALLOC)
2617 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2618 != (SEC_CODE | SEC_ALLOC))
2619 return -1;
2620
2621 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2622 != (SEC_CODE | SEC_ALLOC)
2623 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2624 == (SEC_CODE | SEC_ALLOC))
2625 return 1;
2626
2627 if (synthetic_relocatable)
2628 {
2629 if (a->section->id < b->section->id)
2630 return -1;
2631
2632 if (a->section->id > b->section->id)
2633 return 1;
2634 }
2635
2636 if (a->value + a->section->vma < b->value + b->section->vma)
2637 return -1;
2638
2639 if (a->value + a->section->vma > b->value + b->section->vma)
2640 return 1;
2641
2642 return 0;
2643 }
2644
2645 /* Search SYMS for a symbol of the given VALUE. */
2646
2647 static asymbol *
sym_exists_at(asymbol ** syms,long lo,long hi,int id,bfd_vma value)2648 sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value)
2649 {
2650 long mid;
2651
2652 if (id == -1)
2653 {
2654 while (lo < hi)
2655 {
2656 mid = (lo + hi) >> 1;
2657 if (syms[mid]->value + syms[mid]->section->vma < value)
2658 lo = mid + 1;
2659 else if (syms[mid]->value + syms[mid]->section->vma > value)
2660 hi = mid;
2661 else
2662 return syms[mid];
2663 }
2664 }
2665 else
2666 {
2667 while (lo < hi)
2668 {
2669 mid = (lo + hi) >> 1;
2670 if (syms[mid]->section->id < id)
2671 lo = mid + 1;
2672 else if (syms[mid]->section->id > id)
2673 hi = mid;
2674 else if (syms[mid]->value < value)
2675 lo = mid + 1;
2676 else if (syms[mid]->value > value)
2677 hi = mid;
2678 else
2679 return syms[mid];
2680 }
2681 }
2682 return NULL;
2683 }
2684
2685 /* Create synthetic symbols, effectively restoring "dot-symbol" function
2686 entry syms. */
2687
2688 static long
ppc64_elf_get_synthetic_symtab(bfd * abfd,long static_count,asymbol ** static_syms,long dyn_count,asymbol ** dyn_syms,asymbol ** ret)2689 ppc64_elf_get_synthetic_symtab (bfd *abfd,
2690 long static_count, asymbol **static_syms,
2691 long dyn_count, asymbol **dyn_syms,
2692 asymbol **ret)
2693 {
2694 asymbol *s;
2695 long i;
2696 long count;
2697 char *names;
2698 long symcount, codesecsym, codesecsymend, secsymend, opdsymend;
2699 asection *opd;
2700 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0;
2701 asymbol **syms;
2702
2703 *ret = NULL;
2704
2705 opd = bfd_get_section_by_name (abfd, ".opd");
2706 if (opd == NULL)
2707 return 0;
2708
2709 symcount = static_count;
2710 if (!relocatable)
2711 symcount += dyn_count;
2712 if (symcount == 0)
2713 return 0;
2714
2715 syms = bfd_malloc ((symcount + 1) * sizeof (*syms));
2716 if (syms == NULL)
2717 return -1;
2718
2719 if (!relocatable && static_count != 0 && dyn_count != 0)
2720 {
2721 /* Use both symbol tables. */
2722 memcpy (syms, static_syms, static_count * sizeof (*syms));
2723 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms));
2724 }
2725 else if (!relocatable && static_count == 0)
2726 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms));
2727 else
2728 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms));
2729
2730 synthetic_opd = opd;
2731 synthetic_relocatable = relocatable;
2732 qsort (syms, symcount, sizeof (*syms), compare_symbols);
2733
2734 if (!relocatable && symcount > 1)
2735 {
2736 long j;
2737 /* Trim duplicate syms, since we may have merged the normal and
2738 dynamic symbols. Actually, we only care about syms that have
2739 different values, so trim any with the same value. */
2740 for (i = 1, j = 1; i < symcount; ++i)
2741 if (syms[i - 1]->value + syms[i - 1]->section->vma
2742 != syms[i]->value + syms[i]->section->vma)
2743 syms[j++] = syms[i];
2744 symcount = j;
2745 }
2746
2747 i = 0;
2748 if (syms[i]->section == opd)
2749 ++i;
2750 codesecsym = i;
2751
2752 for (; i < symcount; ++i)
2753 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2754 != (SEC_CODE | SEC_ALLOC))
2755 || (syms[i]->flags & BSF_SECTION_SYM) == 0)
2756 break;
2757 codesecsymend = i;
2758
2759 for (; i < symcount; ++i)
2760 if ((syms[i]->flags & BSF_SECTION_SYM) == 0)
2761 break;
2762 secsymend = i;
2763
2764 for (; i < symcount; ++i)
2765 if (syms[i]->section != opd)
2766 break;
2767 opdsymend = i;
2768
2769 for (; i < symcount; ++i)
2770 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL))
2771 != (SEC_CODE | SEC_ALLOC))
2772 break;
2773 symcount = i;
2774
2775 count = 0;
2776 if (opdsymend == secsymend)
2777 goto done;
2778
2779 if (relocatable)
2780 {
2781 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
2782 arelent *r;
2783 size_t size;
2784 long relcount;
2785
2786 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
2787 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0;
2788 if (relcount == 0)
2789 goto done;
2790
2791 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE))
2792 {
2793 count = -1;
2794 goto done;
2795 }
2796
2797 size = 0;
2798 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i)
2799 {
2800 asymbol *sym;
2801
2802 while (r < opd->relocation + relcount
2803 && r->address < syms[i]->value + opd->vma)
2804 ++r;
2805
2806 if (r == opd->relocation + relcount)
2807 break;
2808
2809 if (r->address != syms[i]->value + opd->vma)
2810 continue;
2811
2812 if (r->howto->type != R_PPC64_ADDR64)
2813 continue;
2814
2815 sym = *r->sym_ptr_ptr;
2816 if (!sym_exists_at (syms, opdsymend, symcount,
2817 sym->section->id, sym->value + r->addend))
2818 {
2819 ++count;
2820 size += sizeof (asymbol);
2821 size += strlen (syms[i]->name) + 2;
2822 }
2823 }
2824
2825 s = *ret = bfd_malloc (size);
2826 if (s == NULL)
2827 {
2828 count = -1;
2829 goto done;
2830 }
2831
2832 names = (char *) (s + count);
2833
2834 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i)
2835 {
2836 asymbol *sym;
2837
2838 while (r < opd->relocation + relcount
2839 && r->address < syms[i]->value + opd->vma)
2840 ++r;
2841
2842 if (r == opd->relocation + relcount)
2843 break;
2844
2845 if (r->address != syms[i]->value + opd->vma)
2846 continue;
2847
2848 if (r->howto->type != R_PPC64_ADDR64)
2849 continue;
2850
2851 sym = *r->sym_ptr_ptr;
2852 if (!sym_exists_at (syms, opdsymend, symcount,
2853 sym->section->id, sym->value + r->addend))
2854 {
2855 size_t len;
2856
2857 *s = *syms[i];
2858 s->section = sym->section;
2859 s->value = sym->value + r->addend;
2860 s->name = names;
2861 *names++ = '.';
2862 len = strlen (syms[i]->name);
2863 memcpy (names, syms[i]->name, len + 1);
2864 names += len + 1;
2865 s++;
2866 }
2867 }
2868 }
2869 else
2870 {
2871 bfd_byte *contents;
2872 size_t size;
2873
2874 if (!bfd_malloc_and_get_section (abfd, opd, &contents))
2875 {
2876 if (contents)
2877 {
2878 free_contents_and_exit:
2879 free (contents);
2880 }
2881 count = -1;
2882 goto done;
2883 }
2884
2885 size = 0;
2886 for (i = secsymend; i < opdsymend; ++i)
2887 {
2888 bfd_vma ent;
2889
2890 ent = bfd_get_64 (abfd, contents + syms[i]->value);
2891 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
2892 {
2893 ++count;
2894 size += sizeof (asymbol);
2895 size += strlen (syms[i]->name) + 2;
2896 }
2897 }
2898
2899 s = *ret = bfd_malloc (size);
2900 if (s == NULL)
2901 goto free_contents_and_exit;
2902
2903 names = (char *) (s + count);
2904
2905 for (i = secsymend; i < opdsymend; ++i)
2906 {
2907 bfd_vma ent;
2908
2909 ent = bfd_get_64 (abfd, contents + syms[i]->value);
2910 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
2911 {
2912 long lo, hi;
2913 size_t len;
2914 asection *sec = abfd->sections;
2915
2916 *s = *syms[i];
2917 lo = codesecsym;
2918 hi = codesecsymend;
2919 while (lo < hi)
2920 {
2921 long mid = (lo + hi) >> 1;
2922 if (syms[mid]->section->vma < ent)
2923 lo = mid + 1;
2924 else if (syms[mid]->section->vma > ent)
2925 hi = mid;
2926 else
2927 {
2928 sec = syms[mid]->section;
2929 break;
2930 }
2931 }
2932
2933 if (lo >= hi && lo > codesecsym)
2934 sec = syms[lo - 1]->section;
2935
2936 for (; sec != NULL; sec = sec->next)
2937 {
2938 if (sec->vma > ent)
2939 break;
2940 if ((sec->flags & SEC_ALLOC) == 0
2941 || (sec->flags & SEC_LOAD) == 0)
2942 break;
2943 if ((sec->flags & SEC_CODE) != 0)
2944 s->section = sec;
2945 }
2946 s->value = ent - s->section->vma;
2947 s->name = names;
2948 *names++ = '.';
2949 len = strlen (syms[i]->name);
2950 memcpy (names, syms[i]->name, len + 1);
2951 names += len + 1;
2952 s++;
2953 }
2954 }
2955 free (contents);
2956 }
2957
2958 done:
2959 free (syms);
2960 return count;
2961 }
2962
2963 /* The following functions are specific to the ELF linker, while
2964 functions above are used generally. Those named ppc64_elf_* are
2965 called by the main ELF linker code. They appear in this file more
2966 or less in the order in which they are called. eg.
2967 ppc64_elf_check_relocs is called early in the link process,
2968 ppc64_elf_finish_dynamic_sections is one of the last functions
2969 called.
2970
2971 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that
2972 functions have both a function code symbol and a function descriptor
2973 symbol. A call to foo in a relocatable object file looks like:
2974
2975 . .text
2976 . x:
2977 . bl .foo
2978 . nop
2979
2980 The function definition in another object file might be:
2981
2982 . .section .opd
2983 . foo: .quad .foo
2984 . .quad .TOC.@tocbase
2985 . .quad 0
2986 .
2987 . .text
2988 . .foo: blr
2989
2990 When the linker resolves the call during a static link, the branch
2991 unsurprisingly just goes to .foo and the .opd information is unused.
2992 If the function definition is in a shared library, things are a little
2993 different: The call goes via a plt call stub, the opd information gets
2994 copied to the plt, and the linker patches the nop.
2995
2996 . x:
2997 . bl .foo_stub
2998 . ld 2,40(1)
2999 .
3000 .
3001 . .foo_stub:
3002 . addis 12,2,Lfoo@toc@ha # in practice, the call stub
3003 . addi 12,12,Lfoo@toc@l # is slightly optimized, but
3004 . std 2,40(1) # this is the general idea
3005 . ld 11,0(12)
3006 . ld 2,8(12)
3007 . mtctr 11
3008 . ld 11,16(12)
3009 . bctr
3010 .
3011 . .section .plt
3012 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo)
3013
3014 The "reloc ()" notation is supposed to indicate that the linker emits
3015 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd
3016 copying.
3017
3018 What are the difficulties here? Well, firstly, the relocations
3019 examined by the linker in check_relocs are against the function code
3020 sym .foo, while the dynamic relocation in the plt is emitted against
3021 the function descriptor symbol, foo. Somewhere along the line, we need
3022 to carefully copy dynamic link information from one symbol to the other.
3023 Secondly, the generic part of the elf linker will make .foo a dynamic
3024 symbol as is normal for most other backends. We need foo dynamic
3025 instead, at least for an application final link. However, when
3026 creating a shared library containing foo, we need to have both symbols
3027 dynamic so that references to .foo are satisfied during the early
3028 stages of linking. Otherwise the linker might decide to pull in a
3029 definition from some other object, eg. a static library.
3030
3031 Update: As of August 2004, we support a new convention. Function
3032 calls may use the function descriptor symbol, ie. "bl foo". This
3033 behaves exactly as "bl .foo". */
3034
3035 /* The linker needs to keep track of the number of relocs that it
3036 decides to copy as dynamic relocs in check_relocs for each symbol.
3037 This is so that it can later discard them if they are found to be
3038 unnecessary. We store the information in a field extending the
3039 regular ELF linker hash table. */
3040
3041 struct ppc_dyn_relocs
3042 {
3043 struct ppc_dyn_relocs *next;
3044
3045 /* The input section of the reloc. */
3046 asection *sec;
3047
3048 /* Total number of relocs copied for the input section. */
3049 bfd_size_type count;
3050
3051 /* Number of pc-relative relocs copied for the input section. */
3052 bfd_size_type pc_count;
3053 };
3054
3055 /* Track GOT entries needed for a given symbol. We might need more
3056 than one got entry per symbol. */
3057 struct got_entry
3058 {
3059 struct got_entry *next;
3060
3061 /* The symbol addend that we'll be placing in the GOT. */
3062 bfd_vma addend;
3063
3064 /* Unlike other ELF targets, we use separate GOT entries for the same
3065 symbol referenced from different input files. This is to support
3066 automatic multiple TOC/GOT sections, where the TOC base can vary
3067 from one input file to another.
3068
3069 Point to the BFD owning this GOT entry. */
3070 bfd *owner;
3071
3072 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD,
3073 TLS_TPREL or TLS_DTPREL for tls entries. */
3074 char tls_type;
3075
3076 /* Reference count until size_dynamic_sections, GOT offset thereafter. */
3077 union
3078 {
3079 bfd_signed_vma refcount;
3080 bfd_vma offset;
3081 } got;
3082 };
3083
3084 /* The same for PLT. */
3085 struct plt_entry
3086 {
3087 struct plt_entry *next;
3088
3089 bfd_vma addend;
3090
3091 union
3092 {
3093 bfd_signed_vma refcount;
3094 bfd_vma offset;
3095 } plt;
3096 };
3097
3098 /* Of those relocs that might be copied as dynamic relocs, this macro
3099 selects those that must be copied when linking a shared library,
3100 even when the symbol is local. */
3101
3102 #define MUST_BE_DYN_RELOC(RTYPE) \
3103 ((RTYPE) != R_PPC64_REL32 \
3104 && (RTYPE) != R_PPC64_REL64 \
3105 && (RTYPE) != R_PPC64_REL30)
3106
3107 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
3108 copying dynamic variables from a shared lib into an app's dynbss
3109 section, and instead use a dynamic relocation to point into the
3110 shared lib. With code that gcc generates, it's vital that this be
3111 enabled; In the PowerPC64 ABI, the address of a function is actually
3112 the address of a function descriptor, which resides in the .opd
3113 section. gcc uses the descriptor directly rather than going via the
3114 GOT as some other ABI's do, which means that initialized function
3115 pointers must reference the descriptor. Thus, a function pointer
3116 initialized to the address of a function in a shared library will
3117 either require a copy reloc, or a dynamic reloc. Using a copy reloc
3118 redefines the function descriptor symbol to point to the copy. This
3119 presents a problem as a plt entry for that function is also
3120 initialized from the function descriptor symbol and the copy reloc
3121 may not be initialized first. */
3122 #define ELIMINATE_COPY_RELOCS 1
3123
3124 /* Section name for stubs is the associated section name plus this
3125 string. */
3126 #define STUB_SUFFIX ".stub"
3127
3128 /* Linker stubs.
3129 ppc_stub_long_branch:
3130 Used when a 14 bit branch (or even a 24 bit branch) can't reach its
3131 destination, but a 24 bit branch in a stub section will reach.
3132 . b dest
3133
3134 ppc_stub_plt_branch:
3135 Similar to the above, but a 24 bit branch in the stub section won't
3136 reach its destination.
3137 . addis %r12,%r2,xxx@toc@ha
3138 . ld %r11,xxx@toc@l(%r12)
3139 . mtctr %r11
3140 . bctr
3141
3142 ppc_stub_plt_call:
3143 Used to call a function in a shared library. If it so happens that
3144 the plt entry referenced crosses a 64k boundary, then an extra
3145 "addis %r12,%r12,1" will be inserted before the load at xxx+8 or
3146 xxx+16 as appropriate.
3147 . addis %r12,%r2,xxx@toc@ha
3148 . std %r2,40(%r1)
3149 . ld %r11,xxx+0@toc@l(%r12)
3150 . ld %r2,xxx+8@toc@l(%r12)
3151 . mtctr %r11
3152 . ld %r11,xxx+16@toc@l(%r12)
3153 . bctr
3154
3155 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional
3156 code to adjust the value and save r2 to support multiple toc sections.
3157 A ppc_stub_long_branch with an r2 offset looks like:
3158 . std %r2,40(%r1)
3159 . addis %r2,%r2,off@ha
3160 . addi %r2,%r2,off@l
3161 . b dest
3162
3163 A ppc_stub_plt_branch with an r2 offset looks like:
3164 . std %r2,40(%r1)
3165 . addis %r12,%r2,xxx@toc@ha
3166 . ld %r11,xxx@toc@l(%r12)
3167 . addis %r2,%r2,off@ha
3168 . addi %r2,%r2,off@l
3169 . mtctr %r11
3170 . bctr
3171 */
3172
3173 enum ppc_stub_type {
3174 ppc_stub_none,
3175 ppc_stub_long_branch,
3176 ppc_stub_long_branch_r2off,
3177 ppc_stub_plt_branch,
3178 ppc_stub_plt_branch_r2off,
3179 ppc_stub_plt_call
3180 };
3181
3182 struct ppc_stub_hash_entry {
3183
3184 /* Base hash table entry structure. */
3185 struct bfd_hash_entry root;
3186
3187 enum ppc_stub_type stub_type;
3188
3189 /* The stub section. */
3190 asection *stub_sec;
3191
3192 /* Offset within stub_sec of the beginning of this stub. */
3193 bfd_vma stub_offset;
3194
3195 /* Given the symbol's value and its section we can determine its final
3196 value when building the stubs (so the stub knows where to jump. */
3197 bfd_vma target_value;
3198 asection *target_section;
3199
3200 /* The symbol table entry, if any, that this was derived from. */
3201 struct ppc_link_hash_entry *h;
3202
3203 /* And the reloc addend that this was derived from. */
3204 bfd_vma addend;
3205
3206 /* Where this stub is being called from, or, in the case of combined
3207 stub sections, the first input section in the group. */
3208 asection *id_sec;
3209 };
3210
3211 struct ppc_branch_hash_entry {
3212
3213 /* Base hash table entry structure. */
3214 struct bfd_hash_entry root;
3215
3216 /* Offset within .branch_lt. */
3217 unsigned int offset;
3218
3219 /* Generation marker. */
3220 unsigned int iter;
3221 };
3222
3223 struct ppc_link_hash_entry
3224 {
3225 struct elf_link_hash_entry elf;
3226
3227 /* A pointer to the most recently used stub hash entry against this
3228 symbol. */
3229 struct ppc_stub_hash_entry *stub_cache;
3230
3231 /* Track dynamic relocs copied for this symbol. */
3232 struct ppc_dyn_relocs *dyn_relocs;
3233
3234 /* Link between function code and descriptor symbols. */
3235 struct ppc_link_hash_entry *oh;
3236
3237 /* Flag function code and descriptor symbols. */
3238 unsigned int is_func:1;
3239 unsigned int is_func_descriptor:1;
3240 unsigned int fake:1;
3241
3242 /* Whether global opd/toc sym has been adjusted or not.
3243 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag
3244 should be set for all globals defined in any opd/toc section. */
3245 unsigned int adjust_done:1;
3246
3247 /* Set if we twiddled this symbol to weak at some stage. */
3248 unsigned int was_undefined:1;
3249
3250 /* Contexts in which symbol is used in the GOT (or TOC).
3251 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the
3252 corresponding relocs are encountered during check_relocs.
3253 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
3254 indicate the corresponding GOT entry type is not needed.
3255 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into
3256 a TPREL one. We use a separate flag rather than setting TPREL
3257 just for convenience in distinguishing the two cases. */
3258 #define TLS_GD 1 /* GD reloc. */
3259 #define TLS_LD 2 /* LD reloc. */
3260 #define TLS_TPREL 4 /* TPREL reloc, => IE. */
3261 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */
3262 #define TLS_TLS 16 /* Any TLS reloc. */
3263 #define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */
3264 #define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */
3265 char tls_mask;
3266 };
3267
3268 /* ppc64 ELF linker hash table. */
3269
3270 struct ppc_link_hash_table
3271 {
3272 struct elf_link_hash_table elf;
3273
3274 /* The stub hash table. */
3275 struct bfd_hash_table stub_hash_table;
3276
3277 /* Another hash table for plt_branch stubs. */
3278 struct bfd_hash_table branch_hash_table;
3279
3280 /* Linker stub bfd. */
3281 bfd *stub_bfd;
3282
3283 /* Linker call-backs. */
3284 asection * (*add_stub_section) (const char *, asection *);
3285 void (*layout_sections_again) (void);
3286
3287 /* Array to keep track of which stub sections have been created, and
3288 information on stub grouping. */
3289 struct map_stub {
3290 /* This is the section to which stubs in the group will be attached. */
3291 asection *link_sec;
3292 /* The stub section. */
3293 asection *stub_sec;
3294 /* Along with elf_gp, specifies the TOC pointer used in this group. */
3295 bfd_vma toc_off;
3296 } *stub_group;
3297
3298 /* Temp used when calculating TOC pointers. */
3299 bfd_vma toc_curr;
3300
3301 /* Highest input section id. */
3302 int top_id;
3303
3304 /* Highest output section index. */
3305 int top_index;
3306
3307 /* List of input sections for each output section. */
3308 asection **input_list;
3309
3310 /* Short-cuts to get to dynamic linker sections. */
3311 asection *got;
3312 asection *plt;
3313 asection *relplt;
3314 asection *dynbss;
3315 asection *relbss;
3316 asection *glink;
3317 asection *sfpr;
3318 asection *brlt;
3319 asection *relbrlt;
3320
3321 /* Shortcut to .__tls_get_addr and __tls_get_addr. */
3322 struct ppc_link_hash_entry *tls_get_addr;
3323 struct ppc_link_hash_entry *tls_get_addr_fd;
3324
3325 /* Statistics. */
3326 unsigned long stub_count[ppc_stub_plt_call];
3327
3328 /* Number of stubs against global syms. */
3329 unsigned long stub_globals;
3330
3331 /* Set if we should emit symbols for stubs. */
3332 unsigned int emit_stub_syms:1;
3333
3334 /* Support for multiple toc sections. */
3335 unsigned int no_multi_toc:1;
3336 unsigned int multi_toc_needed:1;
3337
3338 /* Set on error. */
3339 unsigned int stub_error:1;
3340
3341 /* Flag set when small branches are detected. Used to
3342 select suitable defaults for the stub group size. */
3343 unsigned int has_14bit_branch:1;
3344
3345 /* Temp used by ppc64_elf_check_directives. */
3346 unsigned int twiddled_syms:1;
3347
3348 /* Incremented every time we size stubs. */
3349 unsigned int stub_iteration;
3350
3351 /* Small local sym to section mapping cache. */
3352 struct sym_sec_cache sym_sec;
3353 };
3354
3355 /* Rename some of the generic section flags to better document how they
3356 are used here. */
3357 #define has_toc_reloc has_gp_reloc
3358 #define makes_toc_func_call need_finalize_relax
3359 #define call_check_in_progress reloc_done
3360
3361 /* Get the ppc64 ELF linker hash table from a link_info structure. */
3362
3363 #define ppc_hash_table(p) \
3364 ((struct ppc_link_hash_table *) ((p)->hash))
3365
3366 #define ppc_stub_hash_lookup(table, string, create, copy) \
3367 ((struct ppc_stub_hash_entry *) \
3368 bfd_hash_lookup ((table), (string), (create), (copy)))
3369
3370 #define ppc_branch_hash_lookup(table, string, create, copy) \
3371 ((struct ppc_branch_hash_entry *) \
3372 bfd_hash_lookup ((table), (string), (create), (copy)))
3373
3374 /* Create an entry in the stub hash table. */
3375
3376 static struct bfd_hash_entry *
stub_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3377 stub_hash_newfunc (struct bfd_hash_entry *entry,
3378 struct bfd_hash_table *table,
3379 const char *string)
3380 {
3381 /* Allocate the structure if it has not already been allocated by a
3382 subclass. */
3383 if (entry == NULL)
3384 {
3385 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry));
3386 if (entry == NULL)
3387 return entry;
3388 }
3389
3390 /* Call the allocation method of the superclass. */
3391 entry = bfd_hash_newfunc (entry, table, string);
3392 if (entry != NULL)
3393 {
3394 struct ppc_stub_hash_entry *eh;
3395
3396 /* Initialize the local fields. */
3397 eh = (struct ppc_stub_hash_entry *) entry;
3398 eh->stub_type = ppc_stub_none;
3399 eh->stub_sec = NULL;
3400 eh->stub_offset = 0;
3401 eh->target_value = 0;
3402 eh->target_section = NULL;
3403 eh->h = NULL;
3404 eh->id_sec = NULL;
3405 }
3406
3407 return entry;
3408 }
3409
3410 /* Create an entry in the branch hash table. */
3411
3412 static struct bfd_hash_entry *
branch_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3413 branch_hash_newfunc (struct bfd_hash_entry *entry,
3414 struct bfd_hash_table *table,
3415 const char *string)
3416 {
3417 /* Allocate the structure if it has not already been allocated by a
3418 subclass. */
3419 if (entry == NULL)
3420 {
3421 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry));
3422 if (entry == NULL)
3423 return entry;
3424 }
3425
3426 /* Call the allocation method of the superclass. */
3427 entry = bfd_hash_newfunc (entry, table, string);
3428 if (entry != NULL)
3429 {
3430 struct ppc_branch_hash_entry *eh;
3431
3432 /* Initialize the local fields. */
3433 eh = (struct ppc_branch_hash_entry *) entry;
3434 eh->offset = 0;
3435 eh->iter = 0;
3436 }
3437
3438 return entry;
3439 }
3440
3441 /* Create an entry in a ppc64 ELF linker hash table. */
3442
3443 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)3444 link_hash_newfunc (struct bfd_hash_entry *entry,
3445 struct bfd_hash_table *table,
3446 const char *string)
3447 {
3448 /* Allocate the structure if it has not already been allocated by a
3449 subclass. */
3450 if (entry == NULL)
3451 {
3452 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry));
3453 if (entry == NULL)
3454 return entry;
3455 }
3456
3457 /* Call the allocation method of the superclass. */
3458 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
3459 if (entry != NULL)
3460 {
3461 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry;
3462
3463 memset (&eh->stub_cache, 0,
3464 (sizeof (struct ppc_link_hash_entry)
3465 - offsetof (struct ppc_link_hash_entry, stub_cache)));
3466 }
3467
3468 return entry;
3469 }
3470
3471 /* Create a ppc64 ELF linker hash table. */
3472
3473 static struct bfd_link_hash_table *
ppc64_elf_link_hash_table_create(bfd * abfd)3474 ppc64_elf_link_hash_table_create (bfd *abfd)
3475 {
3476 struct ppc_link_hash_table *htab;
3477 bfd_size_type amt = sizeof (struct ppc_link_hash_table);
3478
3479 htab = bfd_zmalloc (amt);
3480 if (htab == NULL)
3481 return NULL;
3482
3483 if (! _bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc))
3484 {
3485 free (htab);
3486 return NULL;
3487 }
3488
3489 /* Init the stub hash table too. */
3490 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc))
3491 return NULL;
3492
3493 /* And the branch hash table. */
3494 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc))
3495 return NULL;
3496
3497 /* Initializing two fields of the union is just cosmetic. We really
3498 only care about glist, but when compiled on a 32-bit host the
3499 bfd_vma fields are larger. Setting the bfd_vma to zero makes
3500 debugger inspection of these fields look nicer. */
3501 htab->elf.init_got_refcount.refcount = 0;
3502 htab->elf.init_got_refcount.glist = NULL;
3503 htab->elf.init_plt_refcount.refcount = 0;
3504 htab->elf.init_plt_refcount.glist = NULL;
3505 htab->elf.init_got_offset.offset = 0;
3506 htab->elf.init_got_offset.glist = NULL;
3507 htab->elf.init_plt_offset.offset = 0;
3508 htab->elf.init_plt_offset.glist = NULL;
3509
3510 return &htab->elf.root;
3511 }
3512
3513 /* Free the derived linker hash table. */
3514
3515 static void
ppc64_elf_link_hash_table_free(struct bfd_link_hash_table * hash)3516 ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash)
3517 {
3518 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash;
3519
3520 bfd_hash_table_free (&ret->stub_hash_table);
3521 bfd_hash_table_free (&ret->branch_hash_table);
3522 _bfd_generic_link_hash_table_free (hash);
3523 }
3524
3525 /* Satisfy the ELF linker by filling in some fields in our fake bfd. */
3526
3527 void
ppc64_elf_init_stub_bfd(bfd * abfd,struct bfd_link_info * info)3528 ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info)
3529 {
3530 struct ppc_link_hash_table *htab;
3531
3532 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64;
3533
3534 /* Always hook our dynamic sections into the first bfd, which is the
3535 linker created stub bfd. This ensures that the GOT header is at
3536 the start of the output TOC section. */
3537 htab = ppc_hash_table (info);
3538 htab->stub_bfd = abfd;
3539 htab->elf.dynobj = abfd;
3540 }
3541
3542 /* Build a name for an entry in the stub hash table. */
3543
3544 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)3545 ppc_stub_name (const asection *input_section,
3546 const asection *sym_sec,
3547 const struct ppc_link_hash_entry *h,
3548 const Elf_Internal_Rela *rel)
3549 {
3550 char *stub_name;
3551 bfd_size_type len;
3552
3553 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31
3554 offsets from a sym as a branch target? In fact, we could
3555 probably assume the addend is always zero. */
3556 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend);
3557
3558 if (h)
3559 {
3560 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1;
3561 stub_name = bfd_malloc (len);
3562 if (stub_name == NULL)
3563 return stub_name;
3564
3565 sprintf (stub_name, "%08x.%s+%x",
3566 input_section->id & 0xffffffff,
3567 h->elf.root.root.string,
3568 (int) rel->r_addend & 0xffffffff);
3569 }
3570 else
3571 {
3572 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1;
3573 stub_name = bfd_malloc (len);
3574 if (stub_name == NULL)
3575 return stub_name;
3576
3577 sprintf (stub_name, "%08x.%x:%x+%x",
3578 input_section->id & 0xffffffff,
3579 sym_sec->id & 0xffffffff,
3580 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff,
3581 (int) rel->r_addend & 0xffffffff);
3582 }
3583 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0')
3584 stub_name[len - 2] = 0;
3585 return stub_name;
3586 }
3587
3588 /* Look up an entry in the stub hash. Stub entries are cached because
3589 creating the stub name takes a bit of time. */
3590
3591 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)3592 ppc_get_stub_entry (const asection *input_section,
3593 const asection *sym_sec,
3594 struct ppc_link_hash_entry *h,
3595 const Elf_Internal_Rela *rel,
3596 struct ppc_link_hash_table *htab)
3597 {
3598 struct ppc_stub_hash_entry *stub_entry;
3599 const asection *id_sec;
3600
3601 /* If this input section is part of a group of sections sharing one
3602 stub section, then use the id of the first section in the group.
3603 Stub names need to include a section id, as there may well be
3604 more than one stub used to reach say, printf, and we need to
3605 distinguish between them. */
3606 id_sec = htab->stub_group[input_section->id].link_sec;
3607
3608 if (h != NULL && h->stub_cache != NULL
3609 && h->stub_cache->h == h
3610 && h->stub_cache->id_sec == id_sec)
3611 {
3612 stub_entry = h->stub_cache;
3613 }
3614 else
3615 {
3616 char *stub_name;
3617
3618 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel);
3619 if (stub_name == NULL)
3620 return NULL;
3621
3622 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
3623 stub_name, FALSE, FALSE);
3624 if (h != NULL)
3625 h->stub_cache = stub_entry;
3626
3627 free (stub_name);
3628 }
3629
3630 return stub_entry;
3631 }
3632
3633 /* Add a new stub entry to the stub hash. Not all fields of the new
3634 stub entry are initialised. */
3635
3636 static struct ppc_stub_hash_entry *
ppc_add_stub(const char * stub_name,asection * section,struct ppc_link_hash_table * htab)3637 ppc_add_stub (const char *stub_name,
3638 asection *section,
3639 struct ppc_link_hash_table *htab)
3640 {
3641 asection *link_sec;
3642 asection *stub_sec;
3643 struct ppc_stub_hash_entry *stub_entry;
3644
3645 link_sec = htab->stub_group[section->id].link_sec;
3646 stub_sec = htab->stub_group[section->id].stub_sec;
3647 if (stub_sec == NULL)
3648 {
3649 stub_sec = htab->stub_group[link_sec->id].stub_sec;
3650 if (stub_sec == NULL)
3651 {
3652 size_t namelen;
3653 bfd_size_type len;
3654 char *s_name;
3655
3656 namelen = strlen (link_sec->name);
3657 len = namelen + sizeof (STUB_SUFFIX);
3658 s_name = bfd_alloc (htab->stub_bfd, len);
3659 if (s_name == NULL)
3660 return NULL;
3661
3662 memcpy (s_name, link_sec->name, namelen);
3663 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
3664 stub_sec = (*htab->add_stub_section) (s_name, link_sec);
3665 if (stub_sec == NULL)
3666 return NULL;
3667 htab->stub_group[link_sec->id].stub_sec = stub_sec;
3668 }
3669 htab->stub_group[section->id].stub_sec = stub_sec;
3670 }
3671
3672 /* Enter this entry into the linker stub hash table. */
3673 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name,
3674 TRUE, FALSE);
3675 if (stub_entry == NULL)
3676 {
3677 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"),
3678 section->owner, stub_name);
3679 return NULL;
3680 }
3681
3682 stub_entry->stub_sec = stub_sec;
3683 stub_entry->stub_offset = 0;
3684 stub_entry->id_sec = link_sec;
3685 return stub_entry;
3686 }
3687
3688 /* Create sections for linker generated code. */
3689
3690 static bfd_boolean
create_linkage_sections(bfd * dynobj,struct bfd_link_info * info)3691 create_linkage_sections (bfd *dynobj, struct bfd_link_info *info)
3692 {
3693 struct ppc_link_hash_table *htab;
3694 flagword flags;
3695
3696 htab = ppc_hash_table (info);
3697
3698 /* Create .sfpr for code to save and restore fp regs. */
3699 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY
3700 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3701 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr",
3702 flags);
3703 if (htab->sfpr == NULL
3704 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2))
3705 return FALSE;
3706
3707 /* Create .glink for lazy dynamic linking support. */
3708 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink",
3709 flags);
3710 if (htab->glink == NULL
3711 || ! bfd_set_section_alignment (dynobj, htab->glink, 2))
3712 return FALSE;
3713
3714 /* Create .branch_lt for plt_branch stubs. */
3715 flags = (SEC_ALLOC | SEC_LOAD
3716 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3717 htab->brlt = bfd_make_section_anyway_with_flags (dynobj, ".branch_lt",
3718 flags);
3719 if (htab->brlt == NULL
3720 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3))
3721 return FALSE;
3722
3723 if (info->shared || info->emitrelocations)
3724 {
3725 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
3726 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED);
3727 htab->relbrlt = bfd_make_section_anyway_with_flags (dynobj,
3728 ".rela.branch_lt",
3729 flags);
3730 if (!htab->relbrlt
3731 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3))
3732 return FALSE;
3733 }
3734 return TRUE;
3735 }
3736
3737 /* Create .got and .rela.got sections in ABFD, and .got in dynobj if
3738 not already done. */
3739
3740 static bfd_boolean
create_got_section(bfd * abfd,struct bfd_link_info * info)3741 create_got_section (bfd *abfd, struct bfd_link_info *info)
3742 {
3743 asection *got, *relgot;
3744 flagword flags;
3745 struct ppc_link_hash_table *htab = ppc_hash_table (info);
3746
3747 if (!htab->got)
3748 {
3749 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info))
3750 return FALSE;
3751
3752 htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got");
3753 if (!htab->got)
3754 abort ();
3755 }
3756
3757 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3758 | SEC_LINKER_CREATED);
3759
3760 got = bfd_make_section_with_flags (abfd, ".got", flags);
3761 if (!got
3762 || !bfd_set_section_alignment (abfd, got, 3))
3763 return FALSE;
3764
3765 relgot = bfd_make_section_with_flags (abfd, ".rela.got",
3766 flags | SEC_READONLY);
3767 if (!relgot
3768 || ! bfd_set_section_alignment (abfd, relgot, 3))
3769 return FALSE;
3770
3771 ppc64_elf_tdata (abfd)->got = got;
3772 ppc64_elf_tdata (abfd)->relgot = relgot;
3773 return TRUE;
3774 }
3775
3776 /* Create the dynamic sections, and set up shortcuts. */
3777
3778 static bfd_boolean
ppc64_elf_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)3779 ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
3780 {
3781 struct ppc_link_hash_table *htab;
3782
3783 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
3784 return FALSE;
3785
3786 htab = ppc_hash_table (info);
3787 if (!htab->got)
3788 htab->got = bfd_get_section_by_name (dynobj, ".got");
3789 htab->plt = bfd_get_section_by_name (dynobj, ".plt");
3790 htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt");
3791 htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss");
3792 if (!info->shared)
3793 htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss");
3794
3795 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss
3796 || (!info->shared && !htab->relbss))
3797 abort ();
3798
3799 return TRUE;
3800 }
3801
3802 /* Merge PLT info on FROM with that on TO. */
3803
3804 static void
move_plt_plist(struct ppc_link_hash_entry * from,struct ppc_link_hash_entry * to)3805 move_plt_plist (struct ppc_link_hash_entry *from,
3806 struct ppc_link_hash_entry *to)
3807 {
3808 if (from->elf.plt.plist != NULL)
3809 {
3810 if (to->elf.plt.plist != NULL)
3811 {
3812 struct plt_entry **entp;
3813 struct plt_entry *ent;
3814
3815 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; )
3816 {
3817 struct plt_entry *dent;
3818
3819 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next)
3820 if (dent->addend == ent->addend)
3821 {
3822 dent->plt.refcount += ent->plt.refcount;
3823 *entp = ent->next;
3824 break;
3825 }
3826 if (dent == NULL)
3827 entp = &ent->next;
3828 }
3829 *entp = to->elf.plt.plist;
3830 }
3831
3832 to->elf.plt.plist = from->elf.plt.plist;
3833 from->elf.plt.plist = NULL;
3834 }
3835 }
3836
3837 /* Copy the extra info we tack onto an elf_link_hash_entry. */
3838
3839 static void
ppc64_elf_copy_indirect_symbol(const struct elf_backend_data * bed ATTRIBUTE_UNUSED,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)3840 ppc64_elf_copy_indirect_symbol
3841 (const struct elf_backend_data *bed ATTRIBUTE_UNUSED,
3842 struct elf_link_hash_entry *dir,
3843 struct elf_link_hash_entry *ind)
3844 {
3845 struct ppc_link_hash_entry *edir, *eind;
3846
3847 edir = (struct ppc_link_hash_entry *) dir;
3848 eind = (struct ppc_link_hash_entry *) ind;
3849
3850 /* Copy over any dynamic relocs we may have on the indirect sym. */
3851 if (eind->dyn_relocs != NULL)
3852 {
3853 if (edir->dyn_relocs != NULL)
3854 {
3855 struct ppc_dyn_relocs **pp;
3856 struct ppc_dyn_relocs *p;
3857
3858 if (eind->elf.root.type == bfd_link_hash_indirect)
3859 abort ();
3860
3861 /* Add reloc counts against the weak sym to the strong sym
3862 list. Merge any entries against the same section. */
3863 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
3864 {
3865 struct ppc_dyn_relocs *q;
3866
3867 for (q = edir->dyn_relocs; q != NULL; q = q->next)
3868 if (q->sec == p->sec)
3869 {
3870 q->pc_count += p->pc_count;
3871 q->count += p->count;
3872 *pp = p->next;
3873 break;
3874 }
3875 if (q == NULL)
3876 pp = &p->next;
3877 }
3878 *pp = edir->dyn_relocs;
3879 }
3880
3881 edir->dyn_relocs = eind->dyn_relocs;
3882 eind->dyn_relocs = NULL;
3883 }
3884
3885 edir->is_func |= eind->is_func;
3886 edir->is_func_descriptor |= eind->is_func_descriptor;
3887 edir->tls_mask |= eind->tls_mask;
3888
3889 /* If called to transfer flags for a weakdef during processing
3890 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF.
3891 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
3892 if (!(ELIMINATE_COPY_RELOCS
3893 && eind->elf.root.type != bfd_link_hash_indirect
3894 && edir->elf.dynamic_adjusted))
3895 edir->elf.non_got_ref |= eind->elf.non_got_ref;
3896
3897 edir->elf.ref_dynamic |= eind->elf.ref_dynamic;
3898 edir->elf.ref_regular |= eind->elf.ref_regular;
3899 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak;
3900 edir->elf.needs_plt |= eind->elf.needs_plt;
3901
3902 /* If we were called to copy over info for a weak sym, that's all. */
3903 if (eind->elf.root.type != bfd_link_hash_indirect)
3904 return;
3905
3906 /* Copy over got entries that we may have already seen to the
3907 symbol which just became indirect. */
3908 if (eind->elf.got.glist != NULL)
3909 {
3910 if (edir->elf.got.glist != NULL)
3911 {
3912 struct got_entry **entp;
3913 struct got_entry *ent;
3914
3915 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; )
3916 {
3917 struct got_entry *dent;
3918
3919 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next)
3920 if (dent->addend == ent->addend
3921 && dent->owner == ent->owner
3922 && dent->tls_type == ent->tls_type)
3923 {
3924 dent->got.refcount += ent->got.refcount;
3925 *entp = ent->next;
3926 break;
3927 }
3928 if (dent == NULL)
3929 entp = &ent->next;
3930 }
3931 *entp = edir->elf.got.glist;
3932 }
3933
3934 edir->elf.got.glist = eind->elf.got.glist;
3935 eind->elf.got.glist = NULL;
3936 }
3937
3938 /* And plt entries. */
3939 move_plt_plist (eind, edir);
3940
3941 if (edir->elf.dynindx == -1)
3942 {
3943 edir->elf.dynindx = eind->elf.dynindx;
3944 edir->elf.dynstr_index = eind->elf.dynstr_index;
3945 eind->elf.dynindx = -1;
3946 eind->elf.dynstr_index = 0;
3947 }
3948 else
3949 BFD_ASSERT (eind->elf.dynindx == -1);
3950 }
3951
3952 /* Find the function descriptor hash entry from the given function code
3953 hash entry FH. Link the entries via their OH fields. */
3954
3955 static struct ppc_link_hash_entry *
get_fdh(struct ppc_link_hash_entry * fh,struct ppc_link_hash_table * htab)3956 get_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab)
3957 {
3958 struct ppc_link_hash_entry *fdh = fh->oh;
3959
3960 if (fdh == NULL)
3961 {
3962 const char *fd_name = fh->elf.root.root.string + 1;
3963
3964 fdh = (struct ppc_link_hash_entry *)
3965 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE);
3966 if (fdh != NULL)
3967 {
3968 fdh->is_func_descriptor = 1;
3969 fdh->oh = fh;
3970 fh->is_func = 1;
3971 fh->oh = fdh;
3972 }
3973 }
3974
3975 return fdh;
3976 }
3977
3978 /* Make a fake function descriptor sym for the code sym FH. */
3979
3980 static struct ppc_link_hash_entry *
make_fdh(struct bfd_link_info * info,struct ppc_link_hash_entry * fh)3981 make_fdh (struct bfd_link_info *info,
3982 struct ppc_link_hash_entry *fh)
3983 {
3984 bfd *abfd;
3985 asymbol *newsym;
3986 struct bfd_link_hash_entry *bh;
3987 struct ppc_link_hash_entry *fdh;
3988
3989 abfd = fh->elf.root.u.undef.abfd;
3990 newsym = bfd_make_empty_symbol (abfd);
3991 newsym->name = fh->elf.root.root.string + 1;
3992 newsym->section = bfd_und_section_ptr;
3993 newsym->value = 0;
3994 newsym->flags = BSF_WEAK;
3995
3996 bh = NULL;
3997 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name,
3998 newsym->flags, newsym->section,
3999 newsym->value, NULL, FALSE, FALSE,
4000 &bh))
4001 return NULL;
4002
4003 fdh = (struct ppc_link_hash_entry *) bh;
4004 fdh->elf.non_elf = 0;
4005 fdh->fake = 1;
4006 fdh->is_func_descriptor = 1;
4007 fdh->oh = fh;
4008 fh->is_func = 1;
4009 fh->oh = fdh;
4010 return fdh;
4011 }
4012
4013 /* Hacks to support old ABI code.
4014 When making function calls, old ABI code references function entry
4015 points (dot symbols), while new ABI code references the function
4016 descriptor symbol. We need to make any combination of reference and
4017 definition work together, without breaking archive linking.
4018
4019 For a defined function "foo" and an undefined call to "bar":
4020 An old object defines "foo" and ".foo", references ".bar" (possibly
4021 "bar" too).
4022 A new object defines "foo" and references "bar".
4023
4024 A new object thus has no problem with its undefined symbols being
4025 satisfied by definitions in an old object. On the other hand, the
4026 old object won't have ".bar" satisfied by a new object. */
4027
4028 /* Fix function descriptor symbols defined in .opd sections to be
4029 function type. */
4030
4031 static bfd_boolean
ppc64_elf_add_symbol_hook(bfd * ibfd,struct bfd_link_info * info ATTRIBUTE_UNUSED,Elf_Internal_Sym * isym,const char ** name,flagword * flags ATTRIBUTE_UNUSED,asection ** sec,bfd_vma * value ATTRIBUTE_UNUSED)4032 ppc64_elf_add_symbol_hook (bfd *ibfd,
4033 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4034 Elf_Internal_Sym *isym,
4035 const char **name,
4036 flagword *flags ATTRIBUTE_UNUSED,
4037 asection **sec,
4038 bfd_vma *value ATTRIBUTE_UNUSED)
4039 {
4040 if (*sec != NULL
4041 && strcmp (bfd_get_section_name (ibfd, *sec), ".opd") == 0)
4042 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC);
4043
4044 if ((*name)[0] == '.'
4045 && ELF_ST_BIND (isym->st_info) == STB_GLOBAL
4046 && ELF_ST_TYPE (isym->st_info) < STT_SECTION
4047 && is_ppc64_elf_target (ibfd->xvec))
4048 ppc64_elf_tdata (ibfd)->u.has_dotsym = 1;
4049
4050 return TRUE;
4051 }
4052
4053 /* This function makes an old ABI object reference to ".bar" cause the
4054 inclusion of a new ABI object archive that defines "bar".
4055 NAME is a symbol defined in an archive. Return a symbol in the hash
4056 table that might be satisfied by the archive symbols. */
4057
4058 static struct elf_link_hash_entry *
ppc64_elf_archive_symbol_lookup(bfd * abfd,struct bfd_link_info * info,const char * name)4059 ppc64_elf_archive_symbol_lookup (bfd *abfd,
4060 struct bfd_link_info *info,
4061 const char *name)
4062 {
4063 struct elf_link_hash_entry *h;
4064 char *dot_name;
4065 size_t len;
4066
4067 h = _bfd_elf_archive_symbol_lookup (abfd, info, name);
4068 if (h != NULL
4069 /* Don't return this sym if it is a fake function descriptor
4070 created by add_symbol_adjust. */
4071 && !(h->root.type == bfd_link_hash_undefweak
4072 && ((struct ppc_link_hash_entry *) h)->fake))
4073 return h;
4074
4075 if (name[0] == '.')
4076 return h;
4077
4078 len = strlen (name);
4079 dot_name = bfd_alloc (abfd, len + 2);
4080 if (dot_name == NULL)
4081 return (struct elf_link_hash_entry *) 0 - 1;
4082 dot_name[0] = '.';
4083 memcpy (dot_name + 1, name, len + 1);
4084 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name);
4085 bfd_release (abfd, dot_name);
4086 return h;
4087 }
4088
4089 /* This function satisfies all old ABI object references to ".bar" if a
4090 new ABI object defines "bar". Well, at least, undefined dot symbols
4091 are made weak. This stops later archive searches from including an
4092 object if we already have a function descriptor definition. It also
4093 prevents the linker complaining about undefined symbols.
4094 We also check and correct mismatched symbol visibility here. The
4095 most restrictive visibility of the function descriptor and the
4096 function entry symbol is used. */
4097
4098 struct add_symbol_adjust_data
4099 {
4100 struct bfd_link_info *info;
4101 bfd_boolean ok;
4102 };
4103
4104 static bfd_boolean
add_symbol_adjust(struct elf_link_hash_entry * h,void * inf)4105 add_symbol_adjust (struct elf_link_hash_entry *h, void *inf)
4106 {
4107 struct add_symbol_adjust_data *data;
4108 struct ppc_link_hash_table *htab;
4109 struct ppc_link_hash_entry *eh;
4110 struct ppc_link_hash_entry *fdh;
4111
4112 if (h->root.type == bfd_link_hash_indirect)
4113 return TRUE;
4114
4115 if (h->root.type == bfd_link_hash_warning)
4116 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4117
4118 if (h->root.root.string[0] != '.')
4119 return TRUE;
4120
4121 data = inf;
4122 htab = ppc_hash_table (data->info);
4123 eh = (struct ppc_link_hash_entry *) h;
4124 fdh = get_fdh (eh, htab);
4125 if (fdh == NULL
4126 && !data->info->relocatable
4127 && (eh->elf.root.type == bfd_link_hash_undefined
4128 || eh->elf.root.type == bfd_link_hash_undefweak)
4129 && eh->elf.ref_regular)
4130 {
4131 /* Make an undefweak function descriptor sym, which is enough to
4132 pull in an --as-needed shared lib, but won't cause link
4133 errors. Archives are handled elsewhere. */
4134 fdh = make_fdh (data->info, eh);
4135 if (fdh == NULL)
4136 data->ok = FALSE;
4137 else
4138 fdh->elf.ref_regular = 1;
4139 }
4140 else if (fdh != NULL)
4141 {
4142 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1;
4143 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1;
4144 if (entry_vis < descr_vis)
4145 fdh->elf.other += entry_vis - descr_vis;
4146 else if (entry_vis > descr_vis)
4147 eh->elf.other += descr_vis - entry_vis;
4148
4149 if ((fdh->elf.root.type == bfd_link_hash_defined
4150 || fdh->elf.root.type == bfd_link_hash_defweak)
4151 && eh->elf.root.type == bfd_link_hash_undefined)
4152 {
4153 eh->elf.root.type = bfd_link_hash_undefweak;
4154 eh->was_undefined = 1;
4155 htab->twiddled_syms = 1;
4156 }
4157 }
4158
4159 return TRUE;
4160 }
4161
4162 static bfd_boolean
ppc64_elf_check_directives(bfd * abfd,struct bfd_link_info * info)4163 ppc64_elf_check_directives (bfd *abfd, struct bfd_link_info *info)
4164 {
4165 struct ppc_link_hash_table *htab;
4166 struct add_symbol_adjust_data data;
4167
4168 if (!is_ppc64_elf_target (abfd->xvec))
4169 return TRUE;
4170
4171 if (!ppc64_elf_tdata (abfd)->u.has_dotsym)
4172 return TRUE;
4173 ppc64_elf_tdata (abfd)->u.deleted_section = NULL;
4174
4175 htab = ppc_hash_table (info);
4176 if (!is_ppc64_elf_target (htab->elf.root.creator))
4177 return TRUE;
4178
4179 data.info = info;
4180 data.ok = TRUE;
4181 elf_link_hash_traverse (&htab->elf, add_symbol_adjust, &data);
4182
4183 /* We need to fix the undefs list for any syms we have twiddled to
4184 undef_weak. */
4185 if (htab->twiddled_syms)
4186 {
4187 bfd_link_repair_undef_list (&htab->elf.root);
4188 htab->twiddled_syms = 0;
4189 }
4190 return data.ok;
4191 }
4192
4193 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)4194 update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
4195 unsigned long r_symndx, bfd_vma r_addend, int tls_type)
4196 {
4197 struct got_entry **local_got_ents = elf_local_got_ents (abfd);
4198 char *local_got_tls_masks;
4199
4200 if (local_got_ents == NULL)
4201 {
4202 bfd_size_type size = symtab_hdr->sh_info;
4203
4204 size *= sizeof (*local_got_ents) + sizeof (*local_got_tls_masks);
4205 local_got_ents = bfd_zalloc (abfd, size);
4206 if (local_got_ents == NULL)
4207 return FALSE;
4208 elf_local_got_ents (abfd) = local_got_ents;
4209 }
4210
4211 if ((tls_type & TLS_EXPLICIT) == 0)
4212 {
4213 struct got_entry *ent;
4214
4215 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next)
4216 if (ent->addend == r_addend
4217 && ent->owner == abfd
4218 && ent->tls_type == tls_type)
4219 break;
4220 if (ent == NULL)
4221 {
4222 bfd_size_type amt = sizeof (*ent);
4223 ent = bfd_alloc (abfd, amt);
4224 if (ent == NULL)
4225 return FALSE;
4226 ent->next = local_got_ents[r_symndx];
4227 ent->addend = r_addend;
4228 ent->owner = abfd;
4229 ent->tls_type = tls_type;
4230 ent->got.refcount = 0;
4231 local_got_ents[r_symndx] = ent;
4232 }
4233 ent->got.refcount += 1;
4234 }
4235
4236 local_got_tls_masks = (char *) (local_got_ents + symtab_hdr->sh_info);
4237 local_got_tls_masks[r_symndx] |= tls_type;
4238 return TRUE;
4239 }
4240
4241 static bfd_boolean
update_plt_info(bfd * abfd,struct ppc_link_hash_entry * eh,bfd_vma addend)4242 update_plt_info (bfd *abfd, struct ppc_link_hash_entry *eh, bfd_vma addend)
4243 {
4244 struct plt_entry *ent;
4245
4246 for (ent = eh->elf.plt.plist; ent != NULL; ent = ent->next)
4247 if (ent->addend == addend)
4248 break;
4249 if (ent == NULL)
4250 {
4251 bfd_size_type amt = sizeof (*ent);
4252 ent = bfd_alloc (abfd, amt);
4253 if (ent == NULL)
4254 return FALSE;
4255 ent->next = eh->elf.plt.plist;
4256 ent->addend = addend;
4257 ent->plt.refcount = 0;
4258 eh->elf.plt.plist = ent;
4259 }
4260 ent->plt.refcount += 1;
4261 eh->elf.needs_plt = 1;
4262 if (eh->elf.root.root.string[0] == '.'
4263 && eh->elf.root.root.string[1] != '\0')
4264 eh->is_func = 1;
4265 return TRUE;
4266 }
4267
4268 /* Look through the relocs for a section during the first phase, and
4269 calculate needed space in the global offset table, procedure
4270 linkage table, and dynamic reloc sections. */
4271
4272 static bfd_boolean
ppc64_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)4273 ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
4274 asection *sec, const Elf_Internal_Rela *relocs)
4275 {
4276 struct ppc_link_hash_table *htab;
4277 Elf_Internal_Shdr *symtab_hdr;
4278 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
4279 const Elf_Internal_Rela *rel;
4280 const Elf_Internal_Rela *rel_end;
4281 asection *sreloc;
4282 asection **opd_sym_map;
4283
4284 if (info->relocatable)
4285 return TRUE;
4286
4287 /* Don't do anything special with non-loaded, non-alloced sections.
4288 In particular, any relocs in such sections should not affect GOT
4289 and PLT reference counting (ie. we don't allow them to create GOT
4290 or PLT entries), there's no possibility or desire to optimize TLS
4291 relocs, and there's not much point in propagating relocs to shared
4292 libs that the dynamic linker won't relocate. */
4293 if ((sec->flags & SEC_ALLOC) == 0)
4294 return TRUE;
4295
4296 htab = ppc_hash_table (info);
4297 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4298
4299 sym_hashes = elf_sym_hashes (abfd);
4300 sym_hashes_end = (sym_hashes
4301 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym)
4302 - symtab_hdr->sh_info);
4303
4304 sreloc = NULL;
4305 opd_sym_map = NULL;
4306 if (strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0)
4307 {
4308 /* Garbage collection needs some extra help with .opd sections.
4309 We don't want to necessarily keep everything referenced by
4310 relocs in .opd, as that would keep all functions. Instead,
4311 if we reference an .opd symbol (a function descriptor), we
4312 want to keep the function code symbol's section. This is
4313 easy for global symbols, but for local syms we need to keep
4314 information about the associated function section. Later, if
4315 edit_opd deletes entries, we'll use this array to adjust
4316 local syms in .opd. */
4317 union opd_info {
4318 asection *func_section;
4319 long entry_adjust;
4320 };
4321 bfd_size_type amt;
4322
4323 amt = sec->size * sizeof (union opd_info) / 8;
4324 opd_sym_map = bfd_zalloc (abfd, amt);
4325 if (opd_sym_map == NULL)
4326 return FALSE;
4327 ppc64_elf_section_data (sec)->opd.func_sec = opd_sym_map;
4328 }
4329
4330 if (htab->sfpr == NULL
4331 && !create_linkage_sections (htab->elf.dynobj, info))
4332 return FALSE;
4333
4334 rel_end = relocs + sec->reloc_count;
4335 for (rel = relocs; rel < rel_end; rel++)
4336 {
4337 unsigned long r_symndx;
4338 struct elf_link_hash_entry *h;
4339 enum elf_ppc64_reloc_type r_type;
4340 int tls_type = 0;
4341
4342 r_symndx = ELF64_R_SYM (rel->r_info);
4343 if (r_symndx < symtab_hdr->sh_info)
4344 h = NULL;
4345 else
4346 {
4347 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4348 while (h->root.type == bfd_link_hash_indirect
4349 || h->root.type == bfd_link_hash_warning)
4350 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4351 }
4352
4353 r_type = ELF64_R_TYPE (rel->r_info);
4354 switch (r_type)
4355 {
4356 case R_PPC64_GOT_TLSLD16:
4357 case R_PPC64_GOT_TLSLD16_LO:
4358 case R_PPC64_GOT_TLSLD16_HI:
4359 case R_PPC64_GOT_TLSLD16_HA:
4360 ppc64_tlsld_got (abfd)->refcount += 1;
4361 tls_type = TLS_TLS | TLS_LD;
4362 goto dogottls;
4363
4364 case R_PPC64_GOT_TLSGD16:
4365 case R_PPC64_GOT_TLSGD16_LO:
4366 case R_PPC64_GOT_TLSGD16_HI:
4367 case R_PPC64_GOT_TLSGD16_HA:
4368 tls_type = TLS_TLS | TLS_GD;
4369 goto dogottls;
4370
4371 case R_PPC64_GOT_TPREL16_DS:
4372 case R_PPC64_GOT_TPREL16_LO_DS:
4373 case R_PPC64_GOT_TPREL16_HI:
4374 case R_PPC64_GOT_TPREL16_HA:
4375 if (info->shared)
4376 info->flags |= DF_STATIC_TLS;
4377 tls_type = TLS_TLS | TLS_TPREL;
4378 goto dogottls;
4379
4380 case R_PPC64_GOT_DTPREL16_DS:
4381 case R_PPC64_GOT_DTPREL16_LO_DS:
4382 case R_PPC64_GOT_DTPREL16_HI:
4383 case R_PPC64_GOT_DTPREL16_HA:
4384 tls_type = TLS_TLS | TLS_DTPREL;
4385 dogottls:
4386 sec->has_tls_reloc = 1;
4387 /* Fall thru */
4388
4389 case R_PPC64_GOT16:
4390 case R_PPC64_GOT16_DS:
4391 case R_PPC64_GOT16_HA:
4392 case R_PPC64_GOT16_HI:
4393 case R_PPC64_GOT16_LO:
4394 case R_PPC64_GOT16_LO_DS:
4395 /* This symbol requires a global offset table entry. */
4396 sec->has_toc_reloc = 1;
4397 if (ppc64_elf_tdata (abfd)->got == NULL
4398 && !create_got_section (abfd, info))
4399 return FALSE;
4400
4401 if (h != NULL)
4402 {
4403 struct ppc_link_hash_entry *eh;
4404 struct got_entry *ent;
4405
4406 eh = (struct ppc_link_hash_entry *) h;
4407 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next)
4408 if (ent->addend == rel->r_addend
4409 && ent->owner == abfd
4410 && ent->tls_type == tls_type)
4411 break;
4412 if (ent == NULL)
4413 {
4414 bfd_size_type amt = sizeof (*ent);
4415 ent = bfd_alloc (abfd, amt);
4416 if (ent == NULL)
4417 return FALSE;
4418 ent->next = eh->elf.got.glist;
4419 ent->addend = rel->r_addend;
4420 ent->owner = abfd;
4421 ent->tls_type = tls_type;
4422 ent->got.refcount = 0;
4423 eh->elf.got.glist = ent;
4424 }
4425 ent->got.refcount += 1;
4426 eh->tls_mask |= tls_type;
4427 }
4428 else
4429 /* This is a global offset table entry for a local symbol. */
4430 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx,
4431 rel->r_addend, tls_type))
4432 return FALSE;
4433 break;
4434
4435 case R_PPC64_PLT16_HA:
4436 case R_PPC64_PLT16_HI:
4437 case R_PPC64_PLT16_LO:
4438 case R_PPC64_PLT32:
4439 case R_PPC64_PLT64:
4440 /* This symbol requires a procedure linkage table entry. We
4441 actually build the entry in adjust_dynamic_symbol,
4442 because this might be a case of linking PIC code without
4443 linking in any dynamic objects, in which case we don't
4444 need to generate a procedure linkage table after all. */
4445 if (h == NULL)
4446 {
4447 /* It does not make sense to have a procedure linkage
4448 table entry for a local symbol. */
4449 bfd_set_error (bfd_error_bad_value);
4450 return FALSE;
4451 }
4452 else
4453 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h,
4454 rel->r_addend))
4455 return FALSE;
4456 break;
4457
4458 /* The following relocations don't need to propagate the
4459 relocation if linking a shared object since they are
4460 section relative. */
4461 case R_PPC64_SECTOFF:
4462 case R_PPC64_SECTOFF_LO:
4463 case R_PPC64_SECTOFF_HI:
4464 case R_PPC64_SECTOFF_HA:
4465 case R_PPC64_SECTOFF_DS:
4466 case R_PPC64_SECTOFF_LO_DS:
4467 case R_PPC64_DTPREL16:
4468 case R_PPC64_DTPREL16_LO:
4469 case R_PPC64_DTPREL16_HI:
4470 case R_PPC64_DTPREL16_HA:
4471 case R_PPC64_DTPREL16_DS:
4472 case R_PPC64_DTPREL16_LO_DS:
4473 case R_PPC64_DTPREL16_HIGHER:
4474 case R_PPC64_DTPREL16_HIGHERA:
4475 case R_PPC64_DTPREL16_HIGHEST:
4476 case R_PPC64_DTPREL16_HIGHESTA:
4477 break;
4478
4479 /* Nor do these. */
4480 case R_PPC64_TOC16:
4481 case R_PPC64_TOC16_LO:
4482 case R_PPC64_TOC16_HI:
4483 case R_PPC64_TOC16_HA:
4484 case R_PPC64_TOC16_DS:
4485 case R_PPC64_TOC16_LO_DS:
4486 sec->has_toc_reloc = 1;
4487 break;
4488
4489 /* This relocation describes the C++ object vtable hierarchy.
4490 Reconstruct it for later use during GC. */
4491 case R_PPC64_GNU_VTINHERIT:
4492 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4493 return FALSE;
4494 break;
4495
4496 /* This relocation describes which C++ vtable entries are actually
4497 used. Record for later use during GC. */
4498 case R_PPC64_GNU_VTENTRY:
4499 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4500 return FALSE;
4501 break;
4502
4503 case R_PPC64_REL14:
4504 case R_PPC64_REL14_BRTAKEN:
4505 case R_PPC64_REL14_BRNTAKEN:
4506 htab->has_14bit_branch = 1;
4507 /* Fall through. */
4508
4509 case R_PPC64_REL24:
4510 if (h != NULL)
4511 {
4512 /* We may need a .plt entry if the function this reloc
4513 refers to is in a shared lib. */
4514 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h,
4515 rel->r_addend))
4516 return FALSE;
4517 if (h == &htab->tls_get_addr->elf
4518 || h == &htab->tls_get_addr_fd->elf)
4519 sec->has_tls_reloc = 1;
4520 else if (htab->tls_get_addr == NULL
4521 && !strncmp (h->root.root.string, ".__tls_get_addr", 15)
4522 && (h->root.root.string[15] == 0
4523 || h->root.root.string[15] == '@'))
4524 {
4525 htab->tls_get_addr = (struct ppc_link_hash_entry *) h;
4526 sec->has_tls_reloc = 1;
4527 }
4528 else if (htab->tls_get_addr_fd == NULL
4529 && !strncmp (h->root.root.string, "__tls_get_addr", 14)
4530 && (h->root.root.string[14] == 0
4531 || h->root.root.string[14] == '@'))
4532 {
4533 htab->tls_get_addr_fd = (struct ppc_link_hash_entry *) h;
4534 sec->has_tls_reloc = 1;
4535 }
4536 }
4537 break;
4538
4539 case R_PPC64_TPREL64:
4540 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL;
4541 if (info->shared)
4542 info->flags |= DF_STATIC_TLS;
4543 goto dotlstoc;
4544
4545 case R_PPC64_DTPMOD64:
4546 if (rel + 1 < rel_end
4547 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)
4548 && rel[1].r_offset == rel->r_offset + 8)
4549 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD;
4550 else
4551 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD;
4552 goto dotlstoc;
4553
4554 case R_PPC64_DTPREL64:
4555 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL;
4556 if (rel != relocs
4557 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64)
4558 && rel[-1].r_offset == rel->r_offset - 8)
4559 /* This is the second reloc of a dtpmod, dtprel pair.
4560 Don't mark with TLS_DTPREL. */
4561 goto dodyn;
4562
4563 dotlstoc:
4564 sec->has_tls_reloc = 1;
4565 if (h != NULL)
4566 {
4567 struct ppc_link_hash_entry *eh;
4568 eh = (struct ppc_link_hash_entry *) h;
4569 eh->tls_mask |= tls_type;
4570 }
4571 else
4572 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx,
4573 rel->r_addend, tls_type))
4574 return FALSE;
4575
4576 if (ppc64_elf_section_data (sec)->t_symndx == NULL)
4577 {
4578 /* One extra to simplify get_tls_mask. */
4579 bfd_size_type amt = sec->size * sizeof (unsigned) / 8 + 1;
4580 ppc64_elf_section_data (sec)->t_symndx = bfd_zalloc (abfd, amt);
4581 if (ppc64_elf_section_data (sec)->t_symndx == NULL)
4582 return FALSE;
4583 }
4584 BFD_ASSERT (rel->r_offset % 8 == 0);
4585 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8] = r_symndx;
4586
4587 /* Mark the second slot of a GD or LD entry.
4588 -1 to indicate GD and -2 to indicate LD. */
4589 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD))
4590 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8 + 1] = -1;
4591 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD))
4592 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8 + 1] = -2;
4593 goto dodyn;
4594
4595 case R_PPC64_TPREL16:
4596 case R_PPC64_TPREL16_LO:
4597 case R_PPC64_TPREL16_HI:
4598 case R_PPC64_TPREL16_HA:
4599 case R_PPC64_TPREL16_DS:
4600 case R_PPC64_TPREL16_LO_DS:
4601 case R_PPC64_TPREL16_HIGHER:
4602 case R_PPC64_TPREL16_HIGHERA:
4603 case R_PPC64_TPREL16_HIGHEST:
4604 case R_PPC64_TPREL16_HIGHESTA:
4605 if (info->shared)
4606 {
4607 info->flags |= DF_STATIC_TLS;
4608 goto dodyn;
4609 }
4610 break;
4611
4612 case R_PPC64_ADDR64:
4613 if (opd_sym_map != NULL
4614 && rel + 1 < rel_end
4615 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC)
4616 {
4617 if (h != NULL)
4618 {
4619 if (h->root.root.string[0] == '.'
4620 && h->root.root.string[1] != 0
4621 && get_fdh ((struct ppc_link_hash_entry *) h, htab))
4622 ;
4623 else
4624 ((struct ppc_link_hash_entry *) h)->is_func = 1;
4625 }
4626 else
4627 {
4628 asection *s;
4629
4630 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec,
4631 r_symndx);
4632 if (s == NULL)
4633 return FALSE;
4634 else if (s != sec)
4635 opd_sym_map[rel->r_offset / 8] = s;
4636 }
4637 }
4638 /* Fall through. */
4639
4640 case R_PPC64_REL30:
4641 case R_PPC64_REL32:
4642 case R_PPC64_REL64:
4643 case R_PPC64_ADDR14:
4644 case R_PPC64_ADDR14_BRNTAKEN:
4645 case R_PPC64_ADDR14_BRTAKEN:
4646 case R_PPC64_ADDR16:
4647 case R_PPC64_ADDR16_DS:
4648 case R_PPC64_ADDR16_HA:
4649 case R_PPC64_ADDR16_HI:
4650 case R_PPC64_ADDR16_HIGHER:
4651 case R_PPC64_ADDR16_HIGHERA:
4652 case R_PPC64_ADDR16_HIGHEST:
4653 case R_PPC64_ADDR16_HIGHESTA:
4654 case R_PPC64_ADDR16_LO:
4655 case R_PPC64_ADDR16_LO_DS:
4656 case R_PPC64_ADDR24:
4657 case R_PPC64_ADDR32:
4658 case R_PPC64_UADDR16:
4659 case R_PPC64_UADDR32:
4660 case R_PPC64_UADDR64:
4661 case R_PPC64_TOC:
4662 if (h != NULL && !info->shared)
4663 /* We may need a copy reloc. */
4664 h->non_got_ref = 1;
4665
4666 /* Don't propagate .opd relocs. */
4667 if (NO_OPD_RELOCS && opd_sym_map != NULL)
4668 break;
4669
4670 /* If we are creating a shared library, and this is a reloc
4671 against a global symbol, or a non PC relative reloc
4672 against a local symbol, then we need to copy the reloc
4673 into the shared library. However, if we are linking with
4674 -Bsymbolic, we do not need to copy a reloc against a
4675 global symbol which is defined in an object we are
4676 including in the link (i.e., DEF_REGULAR is set). At
4677 this point we have not seen all the input files, so it is
4678 possible that DEF_REGULAR is not set now but will be set
4679 later (it is never cleared). In case of a weak definition,
4680 DEF_REGULAR may be cleared later by a strong definition in
4681 a shared library. We account for that possibility below by
4682 storing information in the dyn_relocs field of the hash
4683 table entry. A similar situation occurs when creating
4684 shared libraries and symbol visibility changes render the
4685 symbol local.
4686
4687 If on the other hand, we are creating an executable, we
4688 may need to keep relocations for symbols satisfied by a
4689 dynamic library if we manage to avoid copy relocs for the
4690 symbol. */
4691 dodyn:
4692 if ((info->shared
4693 && (MUST_BE_DYN_RELOC (r_type)
4694 || (h != NULL
4695 && (! info->symbolic
4696 || h->root.type == bfd_link_hash_defweak
4697 || !h->def_regular))))
4698 || (ELIMINATE_COPY_RELOCS
4699 && !info->shared
4700 && h != NULL
4701 && (h->root.type == bfd_link_hash_defweak
4702 || !h->def_regular)))
4703 {
4704 struct ppc_dyn_relocs *p;
4705 struct ppc_dyn_relocs **head;
4706
4707 /* We must copy these reloc types into the output file.
4708 Create a reloc section in dynobj and make room for
4709 this reloc. */
4710 if (sreloc == NULL)
4711 {
4712 const char *name;
4713 bfd *dynobj;
4714
4715 name = (bfd_elf_string_from_elf_section
4716 (abfd,
4717 elf_elfheader (abfd)->e_shstrndx,
4718 elf_section_data (sec)->rel_hdr.sh_name));
4719 if (name == NULL)
4720 return FALSE;
4721
4722 if (strncmp (name, ".rela", 5) != 0
4723 || strcmp (bfd_get_section_name (abfd, sec),
4724 name + 5) != 0)
4725 {
4726 (*_bfd_error_handler)
4727 (_("%B: bad relocation section name `%s\'"),
4728 abfd, name);
4729 bfd_set_error (bfd_error_bad_value);
4730 }
4731
4732 dynobj = htab->elf.dynobj;
4733 sreloc = bfd_get_section_by_name (dynobj, name);
4734 if (sreloc == NULL)
4735 {
4736 flagword flags;
4737
4738 flags = (SEC_HAS_CONTENTS | SEC_READONLY
4739 | SEC_IN_MEMORY | SEC_LINKER_CREATED
4740 | SEC_ALLOC | SEC_LOAD);
4741 sreloc = bfd_make_section_with_flags (dynobj,
4742 name,
4743 flags);
4744 if (sreloc == NULL
4745 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
4746 return FALSE;
4747 }
4748 elf_section_data (sec)->sreloc = sreloc;
4749 }
4750
4751 /* If this is a global symbol, we count the number of
4752 relocations we need for this symbol. */
4753 if (h != NULL)
4754 {
4755 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs;
4756 }
4757 else
4758 {
4759 /* Track dynamic relocs needed for local syms too.
4760 We really need local syms available to do this
4761 easily. Oh well. */
4762
4763 asection *s;
4764 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
4765 sec, r_symndx);
4766 if (s == NULL)
4767 return FALSE;
4768
4769 head = ((struct ppc_dyn_relocs **)
4770 &elf_section_data (s)->local_dynrel);
4771 }
4772
4773 p = *head;
4774 if (p == NULL || p->sec != sec)
4775 {
4776 p = bfd_alloc (htab->elf.dynobj, sizeof *p);
4777 if (p == NULL)
4778 return FALSE;
4779 p->next = *head;
4780 *head = p;
4781 p->sec = sec;
4782 p->count = 0;
4783 p->pc_count = 0;
4784 }
4785
4786 p->count += 1;
4787 if (!MUST_BE_DYN_RELOC (r_type))
4788 p->pc_count += 1;
4789 }
4790 break;
4791
4792 default:
4793 break;
4794 }
4795 }
4796
4797 return TRUE;
4798 }
4799
4800 /* OFFSET in OPD_SEC specifies a function descriptor. Return the address
4801 of the code entry point, and its section. */
4802
4803 static bfd_vma
opd_entry_value(asection * opd_sec,bfd_vma offset,asection ** code_sec,bfd_vma * code_off)4804 opd_entry_value (asection *opd_sec,
4805 bfd_vma offset,
4806 asection **code_sec,
4807 bfd_vma *code_off)
4808 {
4809 bfd *opd_bfd = opd_sec->owner;
4810 Elf_Internal_Rela *relocs;
4811 Elf_Internal_Rela *lo, *hi, *look;
4812 bfd_vma val;
4813
4814 /* No relocs implies we are linking a --just-symbols object. */
4815 if (opd_sec->reloc_count == 0)
4816 {
4817 bfd_vma val;
4818
4819 if (!bfd_get_section_contents (opd_bfd, opd_sec, &val, offset, 8))
4820 return (bfd_vma) -1;
4821
4822 if (code_sec != NULL)
4823 {
4824 asection *sec, *likely = NULL;
4825 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next)
4826 if (sec->vma <= val
4827 && (sec->flags & SEC_LOAD) != 0
4828 && (sec->flags & SEC_ALLOC) != 0)
4829 likely = sec;
4830 if (likely != NULL)
4831 {
4832 *code_sec = likely;
4833 if (code_off != NULL)
4834 *code_off = val - likely->vma;
4835 }
4836 }
4837 return val;
4838 }
4839
4840 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs;
4841 if (relocs == NULL)
4842 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE);
4843
4844 /* Go find the opd reloc at the sym address. */
4845 lo = relocs;
4846 BFD_ASSERT (lo != NULL);
4847 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */
4848 val = (bfd_vma) -1;
4849 while (lo < hi)
4850 {
4851 look = lo + (hi - lo) / 2;
4852 if (look->r_offset < offset)
4853 lo = look + 1;
4854 else if (look->r_offset > offset)
4855 hi = look;
4856 else
4857 {
4858 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (opd_bfd)->symtab_hdr;
4859 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64
4860 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC)
4861 {
4862 unsigned long symndx = ELF64_R_SYM (look->r_info);
4863 asection *sec;
4864
4865 if (symndx < symtab_hdr->sh_info)
4866 {
4867 Elf_Internal_Sym *sym;
4868
4869 sym = (Elf_Internal_Sym *) symtab_hdr->contents;
4870 if (sym == NULL)
4871 {
4872 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr,
4873 symtab_hdr->sh_info,
4874 0, NULL, NULL, NULL);
4875 if (sym == NULL)
4876 break;
4877 symtab_hdr->contents = (bfd_byte *) sym;
4878 }
4879
4880 sym += symndx;
4881 val = sym->st_value;
4882 sec = NULL;
4883 if ((sym->st_shndx != SHN_UNDEF
4884 && sym->st_shndx < SHN_LORESERVE)
4885 || sym->st_shndx > SHN_HIRESERVE)
4886 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx);
4887 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0);
4888 }
4889 else
4890 {
4891 struct elf_link_hash_entry **sym_hashes;
4892 struct elf_link_hash_entry *rh;
4893
4894 sym_hashes = elf_sym_hashes (opd_bfd);
4895 rh = sym_hashes[symndx - symtab_hdr->sh_info];
4896 while (rh->root.type == bfd_link_hash_indirect
4897 || rh->root.type == bfd_link_hash_warning)
4898 rh = ((struct elf_link_hash_entry *) rh->root.u.i.link);
4899 BFD_ASSERT (rh->root.type == bfd_link_hash_defined
4900 || rh->root.type == bfd_link_hash_defweak);
4901 val = rh->root.u.def.value;
4902 sec = rh->root.u.def.section;
4903 }
4904 val += look->r_addend;
4905 if (code_off != NULL)
4906 *code_off = val;
4907 if (code_sec != NULL)
4908 *code_sec = sec;
4909 if (sec != NULL && sec->output_section != NULL)
4910 val += sec->output_section->vma + sec->output_offset;
4911 }
4912 break;
4913 }
4914 }
4915
4916 return val;
4917 }
4918
4919 /* Return the section that should be marked against GC for a given
4920 relocation. */
4921
4922 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)4923 ppc64_elf_gc_mark_hook (asection *sec,
4924 struct bfd_link_info *info,
4925 Elf_Internal_Rela *rel,
4926 struct elf_link_hash_entry *h,
4927 Elf_Internal_Sym *sym)
4928 {
4929 asection *rsec;
4930
4931 /* First mark all our entry sym sections. */
4932 if (info->gc_sym_list != NULL)
4933 {
4934 struct ppc_link_hash_table *htab = ppc_hash_table (info);
4935 struct bfd_sym_chain *sym = info->gc_sym_list;
4936
4937 info->gc_sym_list = NULL;
4938 do
4939 {
4940 struct ppc_link_hash_entry *eh;
4941
4942 eh = (struct ppc_link_hash_entry *)
4943 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, FALSE);
4944 if (eh == NULL)
4945 continue;
4946 if (eh->elf.root.type != bfd_link_hash_defined
4947 && eh->elf.root.type != bfd_link_hash_defweak)
4948 continue;
4949
4950 if (eh->is_func_descriptor
4951 && (eh->oh->elf.root.type == bfd_link_hash_defined
4952 || eh->oh->elf.root.type == bfd_link_hash_defweak))
4953 rsec = eh->oh->elf.root.u.def.section;
4954 else if (get_opd_info (eh->elf.root.u.def.section) != NULL
4955 && opd_entry_value (eh->elf.root.u.def.section,
4956 eh->elf.root.u.def.value,
4957 &rsec, NULL) != (bfd_vma) -1)
4958 ;
4959 else
4960 continue;
4961
4962 if (!rsec->gc_mark)
4963 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
4964
4965 rsec = eh->elf.root.u.def.section;
4966 if (!rsec->gc_mark)
4967 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
4968
4969 sym = sym->next;
4970 }
4971 while (sym != NULL);
4972 }
4973
4974 /* Syms return NULL if we're marking .opd, so we avoid marking all
4975 function sections, as all functions are referenced in .opd. */
4976 rsec = NULL;
4977 if (get_opd_info (sec) != NULL)
4978 return rsec;
4979
4980 if (h != NULL)
4981 {
4982 enum elf_ppc64_reloc_type r_type;
4983 struct ppc_link_hash_entry *eh;
4984
4985 r_type = ELF64_R_TYPE (rel->r_info);
4986 switch (r_type)
4987 {
4988 case R_PPC64_GNU_VTINHERIT:
4989 case R_PPC64_GNU_VTENTRY:
4990 break;
4991
4992 default:
4993 switch (h->root.type)
4994 {
4995 case bfd_link_hash_defined:
4996 case bfd_link_hash_defweak:
4997 eh = (struct ppc_link_hash_entry *) h;
4998 if (eh->oh != NULL
4999 && eh->oh->is_func_descriptor
5000 && (eh->oh->elf.root.type == bfd_link_hash_defined
5001 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5002 eh = eh->oh;
5003
5004 /* Function descriptor syms cause the associated
5005 function code sym section to be marked. */
5006 if (eh->is_func_descriptor
5007 && (eh->oh->elf.root.type == bfd_link_hash_defined
5008 || eh->oh->elf.root.type == bfd_link_hash_defweak))
5009 {
5010 /* They also mark their opd section. */
5011 if (!eh->elf.root.u.def.section->gc_mark)
5012 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section,
5013 ppc64_elf_gc_mark_hook);
5014
5015 rsec = eh->oh->elf.root.u.def.section;
5016 }
5017 else if (get_opd_info (eh->elf.root.u.def.section) != NULL
5018 && opd_entry_value (eh->elf.root.u.def.section,
5019 eh->elf.root.u.def.value,
5020 &rsec, NULL) != (bfd_vma) -1)
5021 {
5022 if (!eh->elf.root.u.def.section->gc_mark)
5023 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section,
5024 ppc64_elf_gc_mark_hook);
5025 }
5026 else
5027 rsec = h->root.u.def.section;
5028 break;
5029
5030 case bfd_link_hash_common:
5031 rsec = h->root.u.c.p->section;
5032 break;
5033
5034 default:
5035 break;
5036 }
5037 }
5038 }
5039 else
5040 {
5041 asection **opd_sym_section;
5042
5043 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx);
5044 opd_sym_section = get_opd_info (rsec);
5045 if (opd_sym_section != NULL)
5046 {
5047 if (!rsec->gc_mark)
5048 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook);
5049
5050 rsec = opd_sym_section[(sym->st_value + rel->r_addend) / 8];
5051 }
5052 }
5053
5054 return rsec;
5055 }
5056
5057 /* Update the .got, .plt. and dynamic reloc reference counts for the
5058 section being removed. */
5059
5060 static bfd_boolean
ppc64_elf_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)5061 ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
5062 asection *sec, const Elf_Internal_Rela *relocs)
5063 {
5064 struct ppc_link_hash_table *htab;
5065 Elf_Internal_Shdr *symtab_hdr;
5066 struct elf_link_hash_entry **sym_hashes;
5067 struct got_entry **local_got_ents;
5068 const Elf_Internal_Rela *rel, *relend;
5069
5070 if ((sec->flags & SEC_ALLOC) == 0)
5071 return TRUE;
5072
5073 elf_section_data (sec)->local_dynrel = NULL;
5074
5075 htab = ppc_hash_table (info);
5076 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5077 sym_hashes = elf_sym_hashes (abfd);
5078 local_got_ents = elf_local_got_ents (abfd);
5079
5080 relend = relocs + sec->reloc_count;
5081 for (rel = relocs; rel < relend; rel++)
5082 {
5083 unsigned long r_symndx;
5084 enum elf_ppc64_reloc_type r_type;
5085 struct elf_link_hash_entry *h = NULL;
5086 char tls_type = 0;
5087
5088 r_symndx = ELF64_R_SYM (rel->r_info);
5089 r_type = ELF64_R_TYPE (rel->r_info);
5090 if (r_symndx >= symtab_hdr->sh_info)
5091 {
5092 struct ppc_link_hash_entry *eh;
5093 struct ppc_dyn_relocs **pp;
5094 struct ppc_dyn_relocs *p;
5095
5096 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
5097 while (h->root.type == bfd_link_hash_indirect
5098 || h->root.type == bfd_link_hash_warning)
5099 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5100 eh = (struct ppc_link_hash_entry *) h;
5101
5102 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
5103 if (p->sec == sec)
5104 {
5105 /* Everything must go for SEC. */
5106 *pp = p->next;
5107 break;
5108 }
5109 }
5110
5111 switch (r_type)
5112 {
5113 case R_PPC64_GOT_TLSLD16:
5114 case R_PPC64_GOT_TLSLD16_LO:
5115 case R_PPC64_GOT_TLSLD16_HI:
5116 case R_PPC64_GOT_TLSLD16_HA:
5117 ppc64_tlsld_got (abfd)->refcount -= 1;
5118 tls_type = TLS_TLS | TLS_LD;
5119 goto dogot;
5120
5121 case R_PPC64_GOT_TLSGD16:
5122 case R_PPC64_GOT_TLSGD16_LO:
5123 case R_PPC64_GOT_TLSGD16_HI:
5124 case R_PPC64_GOT_TLSGD16_HA:
5125 tls_type = TLS_TLS | TLS_GD;
5126 goto dogot;
5127
5128 case R_PPC64_GOT_TPREL16_DS:
5129 case R_PPC64_GOT_TPREL16_LO_DS:
5130 case R_PPC64_GOT_TPREL16_HI:
5131 case R_PPC64_GOT_TPREL16_HA:
5132 tls_type = TLS_TLS | TLS_TPREL;
5133 goto dogot;
5134
5135 case R_PPC64_GOT_DTPREL16_DS:
5136 case R_PPC64_GOT_DTPREL16_LO_DS:
5137 case R_PPC64_GOT_DTPREL16_HI:
5138 case R_PPC64_GOT_DTPREL16_HA:
5139 tls_type = TLS_TLS | TLS_DTPREL;
5140 goto dogot;
5141
5142 case R_PPC64_GOT16:
5143 case R_PPC64_GOT16_DS:
5144 case R_PPC64_GOT16_HA:
5145 case R_PPC64_GOT16_HI:
5146 case R_PPC64_GOT16_LO:
5147 case R_PPC64_GOT16_LO_DS:
5148 dogot:
5149 {
5150 struct got_entry *ent;
5151
5152 if (h != NULL)
5153 ent = h->got.glist;
5154 else
5155 ent = local_got_ents[r_symndx];
5156
5157 for (; ent != NULL; ent = ent->next)
5158 if (ent->addend == rel->r_addend
5159 && ent->owner == abfd
5160 && ent->tls_type == tls_type)
5161 break;
5162 if (ent == NULL)
5163 abort ();
5164 if (ent->got.refcount > 0)
5165 ent->got.refcount -= 1;
5166 }
5167 break;
5168
5169 case R_PPC64_PLT16_HA:
5170 case R_PPC64_PLT16_HI:
5171 case R_PPC64_PLT16_LO:
5172 case R_PPC64_PLT32:
5173 case R_PPC64_PLT64:
5174 case R_PPC64_REL14:
5175 case R_PPC64_REL14_BRNTAKEN:
5176 case R_PPC64_REL14_BRTAKEN:
5177 case R_PPC64_REL24:
5178 if (h != NULL)
5179 {
5180 struct plt_entry *ent;
5181
5182 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
5183 if (ent->addend == rel->r_addend)
5184 break;
5185 if (ent == NULL)
5186 abort ();
5187 if (ent->plt.refcount > 0)
5188 ent->plt.refcount -= 1;
5189 }
5190 break;
5191
5192 default:
5193 break;
5194 }
5195 }
5196 return TRUE;
5197 }
5198
5199 /* The maximum size of .sfpr. */
5200 #define SFPR_MAX (218*4)
5201
5202 struct sfpr_def_parms
5203 {
5204 const char name[12];
5205 unsigned char lo, hi;
5206 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int);
5207 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int);
5208 };
5209
5210 /* Auto-generate _save*, _rest* functions in .sfpr. */
5211
5212 static unsigned int
sfpr_define(struct bfd_link_info * info,const struct sfpr_def_parms * parm)5213 sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm)
5214 {
5215 struct ppc_link_hash_table *htab = ppc_hash_table (info);
5216 unsigned int i;
5217 size_t len = strlen (parm->name);
5218 bfd_boolean writing = FALSE;
5219 char sym[16];
5220
5221 memcpy (sym, parm->name, len);
5222 sym[len + 2] = 0;
5223
5224 for (i = parm->lo; i <= parm->hi; i++)
5225 {
5226 struct elf_link_hash_entry *h;
5227
5228 sym[len + 0] = i / 10 + '0';
5229 sym[len + 1] = i % 10 + '0';
5230 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE);
5231 if (h != NULL
5232 && !h->def_regular)
5233 {
5234 h->root.type = bfd_link_hash_defined;
5235 h->root.u.def.section = htab->sfpr;
5236 h->root.u.def.value = htab->sfpr->size;
5237 h->type = STT_FUNC;
5238 h->def_regular = 1;
5239 _bfd_elf_link_hash_hide_symbol (info, h, TRUE);
5240 writing = TRUE;
5241 if (htab->sfpr->contents == NULL)
5242 {
5243 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX);
5244 if (htab->sfpr->contents == NULL)
5245 return FALSE;
5246 }
5247 }
5248 if (writing)
5249 {
5250 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size;
5251 if (i != parm->hi)
5252 p = (*parm->write_ent) (htab->elf.dynobj, p, i);
5253 else
5254 p = (*parm->write_tail) (htab->elf.dynobj, p, i);
5255 htab->sfpr->size = p - htab->sfpr->contents;
5256 }
5257 }
5258
5259 return TRUE;
5260 }
5261
5262 static bfd_byte *
savegpr0(bfd * abfd,bfd_byte * p,int r)5263 savegpr0 (bfd *abfd, bfd_byte *p, int r)
5264 {
5265 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5266 return p + 4;
5267 }
5268
5269 static bfd_byte *
savegpr0_tail(bfd * abfd,bfd_byte * p,int r)5270 savegpr0_tail (bfd *abfd, bfd_byte *p, int r)
5271 {
5272 p = savegpr0 (abfd, p, r);
5273 bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
5274 p = p + 4;
5275 bfd_put_32 (abfd, BLR, p);
5276 return p + 4;
5277 }
5278
5279 static bfd_byte *
restgpr0(bfd * abfd,bfd_byte * p,int r)5280 restgpr0 (bfd *abfd, bfd_byte *p, int r)
5281 {
5282 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5283 return p + 4;
5284 }
5285
5286 static bfd_byte *
restgpr0_tail(bfd * abfd,bfd_byte * p,int r)5287 restgpr0_tail (bfd *abfd, bfd_byte *p, int r)
5288 {
5289 bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
5290 p = p + 4;
5291 p = restgpr0 (abfd, p, r);
5292 bfd_put_32 (abfd, MTLR_R0, p);
5293 p = p + 4;
5294 if (r == 29)
5295 {
5296 p = restgpr0 (abfd, p, 30);
5297 p = restgpr0 (abfd, p, 31);
5298 }
5299 bfd_put_32 (abfd, BLR, p);
5300 return p + 4;
5301 }
5302
5303 static bfd_byte *
savegpr1(bfd * abfd,bfd_byte * p,int r)5304 savegpr1 (bfd *abfd, bfd_byte *p, int r)
5305 {
5306 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5307 return p + 4;
5308 }
5309
5310 static bfd_byte *
savegpr1_tail(bfd * abfd,bfd_byte * p,int r)5311 savegpr1_tail (bfd *abfd, bfd_byte *p, int r)
5312 {
5313 p = savegpr1 (abfd, p, r);
5314 bfd_put_32 (abfd, BLR, p);
5315 return p + 4;
5316 }
5317
5318 static bfd_byte *
restgpr1(bfd * abfd,bfd_byte * p,int r)5319 restgpr1 (bfd *abfd, bfd_byte *p, int r)
5320 {
5321 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5322 return p + 4;
5323 }
5324
5325 static bfd_byte *
restgpr1_tail(bfd * abfd,bfd_byte * p,int r)5326 restgpr1_tail (bfd *abfd, bfd_byte *p, int r)
5327 {
5328 p = restgpr1 (abfd, p, r);
5329 bfd_put_32 (abfd, BLR, p);
5330 return p + 4;
5331 }
5332
5333 static bfd_byte *
savefpr(bfd * abfd,bfd_byte * p,int r)5334 savefpr (bfd *abfd, bfd_byte *p, int r)
5335 {
5336 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5337 return p + 4;
5338 }
5339
5340 static bfd_byte *
savefpr0_tail(bfd * abfd,bfd_byte * p,int r)5341 savefpr0_tail (bfd *abfd, bfd_byte *p, int r)
5342 {
5343 p = savefpr (abfd, p, r);
5344 bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
5345 p = p + 4;
5346 bfd_put_32 (abfd, BLR, p);
5347 return p + 4;
5348 }
5349
5350 static bfd_byte *
restfpr(bfd * abfd,bfd_byte * p,int r)5351 restfpr (bfd *abfd, bfd_byte *p, int r)
5352 {
5353 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p);
5354 return p + 4;
5355 }
5356
5357 static bfd_byte *
restfpr0_tail(bfd * abfd,bfd_byte * p,int r)5358 restfpr0_tail (bfd *abfd, bfd_byte *p, int r)
5359 {
5360 bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
5361 p = p + 4;
5362 p = restfpr (abfd, p, r);
5363 bfd_put_32 (abfd, MTLR_R0, p);
5364 p = p + 4;
5365 if (r == 29)
5366 {
5367 p = restfpr (abfd, p, 30);
5368 p = restfpr (abfd, p, 31);
5369 }
5370 bfd_put_32 (abfd, BLR, p);
5371 return p + 4;
5372 }
5373
5374 static bfd_byte *
savefpr1_tail(bfd * abfd,bfd_byte * p,int r)5375 savefpr1_tail (bfd *abfd, bfd_byte *p, int r)
5376 {
5377 p = savefpr (abfd, p, r);
5378 bfd_put_32 (abfd, BLR, p);
5379 return p + 4;
5380 }
5381
5382 static bfd_byte *
restfpr1_tail(bfd * abfd,bfd_byte * p,int r)5383 restfpr1_tail (bfd *abfd, bfd_byte *p, int r)
5384 {
5385 p = restfpr (abfd, p, r);
5386 bfd_put_32 (abfd, BLR, p);
5387 return p + 4;
5388 }
5389
5390 static bfd_byte *
savevr(bfd * abfd,bfd_byte * p,int r)5391 savevr (bfd *abfd, bfd_byte *p, int r)
5392 {
5393 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p);
5394 p = p + 4;
5395 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p);
5396 return p + 4;
5397 }
5398
5399 static bfd_byte *
savevr_tail(bfd * abfd,bfd_byte * p,int r)5400 savevr_tail (bfd *abfd, bfd_byte *p, int r)
5401 {
5402 p = savevr (abfd, p, r);
5403 bfd_put_32 (abfd, BLR, p);
5404 return p + 4;
5405 }
5406
5407 static bfd_byte *
restvr(bfd * abfd,bfd_byte * p,int r)5408 restvr (bfd *abfd, bfd_byte *p, int r)
5409 {
5410 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p);
5411 p = p + 4;
5412 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p);
5413 return p + 4;
5414 }
5415
5416 static bfd_byte *
restvr_tail(bfd * abfd,bfd_byte * p,int r)5417 restvr_tail (bfd *abfd, bfd_byte *p, int r)
5418 {
5419 p = restvr (abfd, p, r);
5420 bfd_put_32 (abfd, BLR, p);
5421 return p + 4;
5422 }
5423
5424 /* Called via elf_link_hash_traverse to transfer dynamic linking
5425 information on function code symbol entries to their corresponding
5426 function descriptor symbol entries. */
5427
5428 static bfd_boolean
func_desc_adjust(struct elf_link_hash_entry * h,void * inf)5429 func_desc_adjust (struct elf_link_hash_entry *h, void *inf)
5430 {
5431 struct bfd_link_info *info;
5432 struct ppc_link_hash_table *htab;
5433 struct plt_entry *ent;
5434 struct ppc_link_hash_entry *fh;
5435 struct ppc_link_hash_entry *fdh;
5436 bfd_boolean force_local;
5437
5438 fh = (struct ppc_link_hash_entry *) h;
5439 if (fh->elf.root.type == bfd_link_hash_indirect)
5440 return TRUE;
5441
5442 if (fh->elf.root.type == bfd_link_hash_warning)
5443 fh = (struct ppc_link_hash_entry *) fh->elf.root.u.i.link;
5444
5445 info = inf;
5446 htab = ppc_hash_table (info);
5447
5448 /* Resolve undefined references to dot-symbols as the value
5449 in the function descriptor, if we have one in a regular object.
5450 This is to satisfy cases like ".quad .foo". Calls to functions
5451 in dynamic objects are handled elsewhere. */
5452 if (fh->elf.root.type == bfd_link_hash_undefweak
5453 && fh->was_undefined
5454 && (fh->oh->elf.root.type == bfd_link_hash_defined
5455 || fh->oh->elf.root.type == bfd_link_hash_defweak)
5456 && get_opd_info (fh->oh->elf.root.u.def.section) != NULL
5457 && opd_entry_value (fh->oh->elf.root.u.def.section,
5458 fh->oh->elf.root.u.def.value,
5459 &fh->elf.root.u.def.section,
5460 &fh->elf.root.u.def.value) != (bfd_vma) -1)
5461 {
5462 fh->elf.root.type = fh->oh->elf.root.type;
5463 fh->elf.forced_local = 1;
5464 }
5465
5466 /* If this is a function code symbol, transfer dynamic linking
5467 information to the function descriptor symbol. */
5468 if (!fh->is_func)
5469 return TRUE;
5470
5471 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next)
5472 if (ent->plt.refcount > 0)
5473 break;
5474 if (ent == NULL
5475 || fh->elf.root.root.string[0] != '.'
5476 || fh->elf.root.root.string[1] == '\0')
5477 return TRUE;
5478
5479 /* Find the corresponding function descriptor symbol. Create it
5480 as undefined if necessary. */
5481
5482 fdh = get_fdh (fh, htab);
5483 if (fdh != NULL)
5484 while (fdh->elf.root.type == bfd_link_hash_indirect
5485 || fdh->elf.root.type == bfd_link_hash_warning)
5486 fdh = (struct ppc_link_hash_entry *) fdh->elf.root.u.i.link;
5487
5488 if (fdh == NULL
5489 && info->shared
5490 && (fh->elf.root.type == bfd_link_hash_undefined
5491 || fh->elf.root.type == bfd_link_hash_undefweak))
5492 {
5493 fdh = make_fdh (info, fh);
5494 if (fdh == NULL)
5495 return FALSE;
5496 }
5497
5498 /* Fake function descriptors are made undefweak. If the function
5499 code symbol is strong undefined, make the fake sym the same.
5500 If the function code symbol is defined, then force the fake
5501 descriptor local; We can't support overriding of symbols in a
5502 shared library on a fake descriptor. */
5503
5504 if (fdh != NULL
5505 && fdh->fake
5506 && fdh->elf.root.type == bfd_link_hash_undefweak)
5507 {
5508 if (fh->elf.root.type == bfd_link_hash_undefined)
5509 {
5510 fdh->elf.root.type = bfd_link_hash_undefined;
5511 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root);
5512 }
5513 else if (fh->elf.root.type == bfd_link_hash_defined
5514 || fh->elf.root.type == bfd_link_hash_defweak)
5515 {
5516 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE);
5517 }
5518 }
5519
5520 if (fdh != NULL
5521 && !fdh->elf.forced_local
5522 && (info->shared
5523 || fdh->elf.def_dynamic
5524 || fdh->elf.ref_dynamic
5525 || (fdh->elf.root.type == bfd_link_hash_undefweak
5526 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT)))
5527 {
5528 if (fdh->elf.dynindx == -1)
5529 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf))
5530 return FALSE;
5531 fdh->elf.ref_regular |= fh->elf.ref_regular;
5532 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic;
5533 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak;
5534 fdh->elf.non_got_ref |= fh->elf.non_got_ref;
5535 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT)
5536 {
5537 move_plt_plist (fh, fdh);
5538 fdh->elf.needs_plt = 1;
5539 }
5540 fdh->is_func_descriptor = 1;
5541 fdh->oh = fh;
5542 fh->oh = fdh;
5543 }
5544
5545 /* Now that the info is on the function descriptor, clear the
5546 function code sym info. Any function code syms for which we
5547 don't have a definition in a regular file, we force local.
5548 This prevents a shared library from exporting syms that have
5549 been imported from another library. Function code syms that
5550 are really in the library we must leave global to prevent the
5551 linker dragging in a definition from a static library. */
5552 force_local = (!fh->elf.def_regular
5553 || fdh == NULL
5554 || !fdh->elf.def_regular
5555 || fdh->elf.forced_local);
5556 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local);
5557
5558 return TRUE;
5559 }
5560
5561 /* Called near the start of bfd_elf_size_dynamic_sections. We use
5562 this hook to a) provide some gcc support functions, and b) transfer
5563 dynamic linking information gathered so far on function code symbol
5564 entries, to their corresponding function descriptor symbol entries. */
5565
5566 static bfd_boolean
ppc64_elf_func_desc_adjust(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)5567 ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED,
5568 struct bfd_link_info *info)
5569 {
5570 struct ppc_link_hash_table *htab;
5571 unsigned int i;
5572 const struct sfpr_def_parms funcs[] =
5573 {
5574 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail },
5575 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail },
5576 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail },
5577 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail },
5578 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail },
5579 { "_savefpr_", 14, 31, savefpr, savefpr0_tail },
5580 { "_restfpr_", 14, 29, restfpr, restfpr0_tail },
5581 { "_restfpr_", 30, 31, restfpr, restfpr0_tail },
5582 { "._savef", 14, 31, savefpr, savefpr1_tail },
5583 { "._restf", 14, 31, restfpr, restfpr1_tail },
5584 { "_savevr_", 20, 31, savevr, savevr_tail },
5585 { "_restvr_", 20, 31, restvr, restvr_tail }
5586 };
5587
5588 htab = ppc_hash_table (info);
5589 if (htab->sfpr == NULL)
5590 /* We don't have any relocs. */
5591 return TRUE;
5592
5593 /* Provide any missing _save* and _rest* functions. */
5594 htab->sfpr->size = 0;
5595 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
5596 if (!sfpr_define (info, &funcs[i]))
5597 return FALSE;
5598
5599 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
5600
5601 if (htab->sfpr->size == 0)
5602 htab->sfpr->flags |= SEC_EXCLUDE;
5603
5604 return TRUE;
5605 }
5606
5607 /* Adjust a symbol defined by a dynamic object and referenced by a
5608 regular object. The current definition is in some section of the
5609 dynamic object, but we're not including those sections. We have to
5610 change the definition to something the rest of the link can
5611 understand. */
5612
5613 static bfd_boolean
ppc64_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)5614 ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
5615 struct elf_link_hash_entry *h)
5616 {
5617 struct ppc_link_hash_table *htab;
5618 asection *s;
5619 unsigned int power_of_two;
5620
5621 htab = ppc_hash_table (info);
5622
5623 /* Deal with function syms. */
5624 if (h->type == STT_FUNC
5625 || h->needs_plt)
5626 {
5627 /* Clear procedure linkage table information for any symbol that
5628 won't need a .plt entry. */
5629 struct plt_entry *ent;
5630 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
5631 if (ent->plt.refcount > 0)
5632 break;
5633 if (ent == NULL
5634 || SYMBOL_CALLS_LOCAL (info, h)
5635 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
5636 && h->root.type == bfd_link_hash_undefweak))
5637 {
5638 h->plt.plist = NULL;
5639 h->needs_plt = 0;
5640 }
5641 }
5642 else
5643 h->plt.plist = NULL;
5644
5645 /* If this is a weak symbol, and there is a real definition, the
5646 processor independent code will have arranged for us to see the
5647 real definition first, and we can just use the same value. */
5648 if (h->u.weakdef != NULL)
5649 {
5650 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
5651 || h->u.weakdef->root.type == bfd_link_hash_defweak);
5652 h->root.u.def.section = h->u.weakdef->root.u.def.section;
5653 h->root.u.def.value = h->u.weakdef->root.u.def.value;
5654 if (ELIMINATE_COPY_RELOCS)
5655 h->non_got_ref = h->u.weakdef->non_got_ref;
5656 return TRUE;
5657 }
5658
5659 /* If we are creating a shared library, we must presume that the
5660 only references to the symbol are via the global offset table.
5661 For such cases we need not do anything here; the relocations will
5662 be handled correctly by relocate_section. */
5663 if (info->shared)
5664 return TRUE;
5665
5666 /* If there are no references to this symbol that do not use the
5667 GOT, we don't need to generate a copy reloc. */
5668 if (!h->non_got_ref)
5669 return TRUE;
5670
5671 if (ELIMINATE_COPY_RELOCS)
5672 {
5673 struct ppc_link_hash_entry * eh;
5674 struct ppc_dyn_relocs *p;
5675
5676 eh = (struct ppc_link_hash_entry *) h;
5677 for (p = eh->dyn_relocs; p != NULL; p = p->next)
5678 {
5679 s = p->sec->output_section;
5680 if (s != NULL && (s->flags & SEC_READONLY) != 0)
5681 break;
5682 }
5683
5684 /* If we didn't find any dynamic relocs in read-only sections, then
5685 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
5686 if (p == NULL)
5687 {
5688 h->non_got_ref = 0;
5689 return TRUE;
5690 }
5691 }
5692
5693 if (h->plt.plist != NULL)
5694 {
5695 /* We should never get here, but unfortunately there are versions
5696 of gcc out there that improperly (for this ABI) put initialized
5697 function pointers, vtable refs and suchlike in read-only
5698 sections. Allow them to proceed, but warn that this might
5699 break at runtime. */
5700 (*_bfd_error_handler)
5701 (_("copy reloc against `%s' requires lazy plt linking; "
5702 "avoid setting LD_BIND_NOW=1 or upgrade gcc"),
5703 h->root.root.string);
5704 }
5705
5706 /* This is a reference to a symbol defined by a dynamic object which
5707 is not a function. */
5708
5709 /* We must allocate the symbol in our .dynbss section, which will
5710 become part of the .bss section of the executable. There will be
5711 an entry for this symbol in the .dynsym section. The dynamic
5712 object will contain position independent code, so all references
5713 from the dynamic object to this symbol will go through the global
5714 offset table. The dynamic linker will use the .dynsym entry to
5715 determine the address it must put in the global offset table, so
5716 both the dynamic object and the regular object will refer to the
5717 same memory location for the variable. */
5718
5719 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker
5720 to copy the initial value out of the dynamic object and into the
5721 runtime process image. We need to remember the offset into the
5722 .rela.bss section we are going to use. */
5723 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
5724 {
5725 htab->relbss->size += sizeof (Elf64_External_Rela);
5726 h->needs_copy = 1;
5727 }
5728
5729 /* We need to figure out the alignment required for this symbol. I
5730 have no idea how ELF linkers handle this. */
5731 power_of_two = bfd_log2 (h->size);
5732 if (power_of_two > 4)
5733 power_of_two = 4;
5734
5735 /* Apply the required alignment. */
5736 s = htab->dynbss;
5737 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
5738 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
5739 {
5740 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
5741 return FALSE;
5742 }
5743
5744 /* Define the symbol as being at this point in the section. */
5745 h->root.u.def.section = s;
5746 h->root.u.def.value = s->size;
5747
5748 /* Increment the section size to make room for the symbol. */
5749 s->size += h->size;
5750
5751 return TRUE;
5752 }
5753
5754 /* If given a function descriptor symbol, hide both the function code
5755 sym and the descriptor. */
5756 static void
ppc64_elf_hide_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h,bfd_boolean force_local)5757 ppc64_elf_hide_symbol (struct bfd_link_info *info,
5758 struct elf_link_hash_entry *h,
5759 bfd_boolean force_local)
5760 {
5761 struct ppc_link_hash_entry *eh;
5762 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
5763
5764 eh = (struct ppc_link_hash_entry *) h;
5765 if (eh->is_func_descriptor)
5766 {
5767 struct ppc_link_hash_entry *fh = eh->oh;
5768
5769 if (fh == NULL)
5770 {
5771 const char *p, *q;
5772 struct ppc_link_hash_table *htab;
5773 char save;
5774
5775 /* We aren't supposed to use alloca in BFD because on
5776 systems which do not have alloca the version in libiberty
5777 calls xmalloc, which might cause the program to crash
5778 when it runs out of memory. This function doesn't have a
5779 return status, so there's no way to gracefully return an
5780 error. So cheat. We know that string[-1] can be safely
5781 accessed; It's either a string in an ELF string table,
5782 or allocated in an objalloc structure. */
5783
5784 p = eh->elf.root.root.string - 1;
5785 save = *p;
5786 *(char *) p = '.';
5787 htab = ppc_hash_table (info);
5788 fh = (struct ppc_link_hash_entry *)
5789 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE);
5790 *(char *) p = save;
5791
5792 /* Unfortunately, if it so happens that the string we were
5793 looking for was allocated immediately before this string,
5794 then we overwrote the string terminator. That's the only
5795 reason the lookup should fail. */
5796 if (fh == NULL)
5797 {
5798 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string);
5799 while (q >= eh->elf.root.root.string && *q == *p)
5800 --q, --p;
5801 if (q < eh->elf.root.root.string && *p == '.')
5802 fh = (struct ppc_link_hash_entry *)
5803 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE);
5804 }
5805 if (fh != NULL)
5806 {
5807 eh->oh = fh;
5808 fh->oh = eh;
5809 }
5810 }
5811 if (fh != NULL)
5812 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local);
5813 }
5814 }
5815
5816 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)5817 get_sym_h (struct elf_link_hash_entry **hp,
5818 Elf_Internal_Sym **symp,
5819 asection **symsecp,
5820 char **tls_maskp,
5821 Elf_Internal_Sym **locsymsp,
5822 unsigned long r_symndx,
5823 bfd *ibfd)
5824 {
5825 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
5826
5827 if (r_symndx >= symtab_hdr->sh_info)
5828 {
5829 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd);
5830 struct elf_link_hash_entry *h;
5831
5832 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
5833 while (h->root.type == bfd_link_hash_indirect
5834 || h->root.type == bfd_link_hash_warning)
5835 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5836
5837 if (hp != NULL)
5838 *hp = h;
5839
5840 if (symp != NULL)
5841 *symp = NULL;
5842
5843 if (symsecp != NULL)
5844 {
5845 asection *symsec = NULL;
5846 if (h->root.type == bfd_link_hash_defined
5847 || h->root.type == bfd_link_hash_defweak)
5848 symsec = h->root.u.def.section;
5849 *symsecp = symsec;
5850 }
5851
5852 if (tls_maskp != NULL)
5853 {
5854 struct ppc_link_hash_entry *eh;
5855
5856 eh = (struct ppc_link_hash_entry *) h;
5857 *tls_maskp = &eh->tls_mask;
5858 }
5859 }
5860 else
5861 {
5862 Elf_Internal_Sym *sym;
5863 Elf_Internal_Sym *locsyms = *locsymsp;
5864
5865 if (locsyms == NULL)
5866 {
5867 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
5868 if (locsyms == NULL)
5869 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
5870 symtab_hdr->sh_info,
5871 0, NULL, NULL, NULL);
5872 if (locsyms == NULL)
5873 return FALSE;
5874 *locsymsp = locsyms;
5875 }
5876 sym = locsyms + r_symndx;
5877
5878 if (hp != NULL)
5879 *hp = NULL;
5880
5881 if (symp != NULL)
5882 *symp = sym;
5883
5884 if (symsecp != NULL)
5885 {
5886 asection *symsec = NULL;
5887 if ((sym->st_shndx != SHN_UNDEF
5888 && sym->st_shndx < SHN_LORESERVE)
5889 || sym->st_shndx > SHN_HIRESERVE)
5890 symsec = bfd_section_from_elf_index (ibfd, sym->st_shndx);
5891 *symsecp = symsec;
5892 }
5893
5894 if (tls_maskp != NULL)
5895 {
5896 struct got_entry **lgot_ents;
5897 char *tls_mask;
5898
5899 tls_mask = NULL;
5900 lgot_ents = elf_local_got_ents (ibfd);
5901 if (lgot_ents != NULL)
5902 {
5903 char *lgot_masks = (char *) (lgot_ents + symtab_hdr->sh_info);
5904 tls_mask = &lgot_masks[r_symndx];
5905 }
5906 *tls_maskp = tls_mask;
5907 }
5908 }
5909 return TRUE;
5910 }
5911
5912 /* Returns TLS_MASKP for the given REL symbol. Function return is 0 on
5913 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD
5914 type suitable for optimization, and 1 otherwise. */
5915
5916 static int
get_tls_mask(char ** tls_maskp,unsigned long * toc_symndx,Elf_Internal_Sym ** locsymsp,const Elf_Internal_Rela * rel,bfd * ibfd)5917 get_tls_mask (char **tls_maskp, unsigned long *toc_symndx,
5918 Elf_Internal_Sym **locsymsp,
5919 const Elf_Internal_Rela *rel, bfd *ibfd)
5920 {
5921 unsigned long r_symndx;
5922 int next_r;
5923 struct elf_link_hash_entry *h;
5924 Elf_Internal_Sym *sym;
5925 asection *sec;
5926 bfd_vma off;
5927
5928 r_symndx = ELF64_R_SYM (rel->r_info);
5929 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd))
5930 return 0;
5931
5932 if ((*tls_maskp != NULL && **tls_maskp != 0)
5933 || sec == NULL
5934 || ppc64_elf_section_data (sec)->t_symndx == NULL)
5935 return 1;
5936
5937 /* Look inside a TOC section too. */
5938 if (h != NULL)
5939 {
5940 BFD_ASSERT (h->root.type == bfd_link_hash_defined);
5941 off = h->root.u.def.value;
5942 }
5943 else
5944 off = sym->st_value;
5945 off += rel->r_addend;
5946 BFD_ASSERT (off % 8 == 0);
5947 r_symndx = ppc64_elf_section_data (sec)->t_symndx[off / 8];
5948 next_r = ppc64_elf_section_data (sec)->t_symndx[off / 8 + 1];
5949 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd))
5950 return 0;
5951 if (toc_symndx != NULL)
5952 *toc_symndx = r_symndx;
5953 if ((h == NULL
5954 || ((h->root.type == bfd_link_hash_defined
5955 || h->root.type == bfd_link_hash_defweak)
5956 && !h->def_dynamic))
5957 && (next_r == -1 || next_r == -2))
5958 return 1 - next_r;
5959 return 1;
5960 }
5961
5962 /* Adjust all global syms defined in opd sections. In gcc generated
5963 code for the old ABI, these will already have been done. */
5964
5965 static bfd_boolean
adjust_opd_syms(struct elf_link_hash_entry * h,void * inf ATTRIBUTE_UNUSED)5966 adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
5967 {
5968 struct ppc_link_hash_entry *eh;
5969 asection *sym_sec;
5970 long *opd_adjust;
5971
5972 if (h->root.type == bfd_link_hash_indirect)
5973 return TRUE;
5974
5975 if (h->root.type == bfd_link_hash_warning)
5976 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5977
5978 if (h->root.type != bfd_link_hash_defined
5979 && h->root.type != bfd_link_hash_defweak)
5980 return TRUE;
5981
5982 eh = (struct ppc_link_hash_entry *) h;
5983 if (eh->adjust_done)
5984 return TRUE;
5985
5986 sym_sec = eh->elf.root.u.def.section;
5987 opd_adjust = get_opd_info (sym_sec);
5988 if (opd_adjust != NULL)
5989 {
5990 long adjust = opd_adjust[eh->elf.root.u.def.value / 8];
5991 if (adjust == -1)
5992 {
5993 /* This entry has been deleted. */
5994 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->u.deleted_section;
5995 if (dsec == NULL)
5996 {
5997 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next)
5998 if (elf_discarded_section (dsec))
5999 {
6000 ppc64_elf_tdata (sym_sec->owner)->u.deleted_section = dsec;
6001 break;
6002 }
6003 }
6004 eh->elf.root.u.def.value = 0;
6005 eh->elf.root.u.def.section = dsec;
6006 }
6007 else
6008 eh->elf.root.u.def.value += adjust;
6009 eh->adjust_done = 1;
6010 }
6011 return TRUE;
6012 }
6013
6014 /* Handles decrementing dynamic reloc counts for the reloc specified by
6015 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC
6016 have already been determined. */
6017
6018 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)6019 dec_dynrel_count (bfd_vma r_info,
6020 asection *sec,
6021 struct bfd_link_info *info,
6022 Elf_Internal_Sym **local_syms,
6023 struct elf_link_hash_entry *h,
6024 asection *sym_sec)
6025 {
6026 enum elf_ppc64_reloc_type r_type;
6027 struct ppc_dyn_relocs *p;
6028 struct ppc_dyn_relocs **pp;
6029
6030 /* Can this reloc be dynamic? This switch, and later tests here
6031 should be kept in sync with the code in check_relocs. */
6032 r_type = ELF64_R_TYPE (r_info);
6033 switch (r_type)
6034 {
6035 default:
6036 return TRUE;
6037
6038 case R_PPC64_TPREL16:
6039 case R_PPC64_TPREL16_LO:
6040 case R_PPC64_TPREL16_HI:
6041 case R_PPC64_TPREL16_HA:
6042 case R_PPC64_TPREL16_DS:
6043 case R_PPC64_TPREL16_LO_DS:
6044 case R_PPC64_TPREL16_HIGHER:
6045 case R_PPC64_TPREL16_HIGHERA:
6046 case R_PPC64_TPREL16_HIGHEST:
6047 case R_PPC64_TPREL16_HIGHESTA:
6048 if (!info->shared)
6049 return TRUE;
6050
6051 case R_PPC64_TPREL64:
6052 case R_PPC64_DTPMOD64:
6053 case R_PPC64_DTPREL64:
6054 case R_PPC64_ADDR64:
6055 case R_PPC64_REL30:
6056 case R_PPC64_REL32:
6057 case R_PPC64_REL64:
6058 case R_PPC64_ADDR14:
6059 case R_PPC64_ADDR14_BRNTAKEN:
6060 case R_PPC64_ADDR14_BRTAKEN:
6061 case R_PPC64_ADDR16:
6062 case R_PPC64_ADDR16_DS:
6063 case R_PPC64_ADDR16_HA:
6064 case R_PPC64_ADDR16_HI:
6065 case R_PPC64_ADDR16_HIGHER:
6066 case R_PPC64_ADDR16_HIGHERA:
6067 case R_PPC64_ADDR16_HIGHEST:
6068 case R_PPC64_ADDR16_HIGHESTA:
6069 case R_PPC64_ADDR16_LO:
6070 case R_PPC64_ADDR16_LO_DS:
6071 case R_PPC64_ADDR24:
6072 case R_PPC64_ADDR32:
6073 case R_PPC64_UADDR16:
6074 case R_PPC64_UADDR32:
6075 case R_PPC64_UADDR64:
6076 case R_PPC64_TOC:
6077 break;
6078 }
6079
6080 if (local_syms != NULL)
6081 {
6082 unsigned long r_symndx;
6083 Elf_Internal_Sym *sym;
6084 bfd *ibfd = sec->owner;
6085
6086 r_symndx = ELF64_R_SYM (r_info);
6087 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd))
6088 return FALSE;
6089 }
6090
6091 if ((info->shared
6092 && (MUST_BE_DYN_RELOC (r_type)
6093 || (h != NULL
6094 && (!info->symbolic
6095 || h->root.type == bfd_link_hash_defweak
6096 || !h->def_regular))))
6097 || (ELIMINATE_COPY_RELOCS
6098 && !info->shared
6099 && h != NULL
6100 && (h->root.type == bfd_link_hash_defweak
6101 || !h->def_regular)))
6102 ;
6103 else
6104 return TRUE;
6105
6106 if (h != NULL)
6107 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs;
6108 else if (sym_sec != NULL)
6109 pp = (struct ppc_dyn_relocs **) &elf_section_data (sym_sec)->local_dynrel;
6110 else
6111 pp = (struct ppc_dyn_relocs **) &elf_section_data (sec)->local_dynrel;
6112
6113 while ((p = *pp) != NULL)
6114 {
6115 if (p->sec == sec)
6116 {
6117 if (!MUST_BE_DYN_RELOC (r_type))
6118 p->pc_count -= 1;
6119 p->count -= 1;
6120 if (p->count == 0)
6121 *pp = p->next;
6122 return TRUE;
6123 }
6124 pp = &p->next;
6125 }
6126
6127 (*_bfd_error_handler) (_("dynreloc miscount for %B, section %A"),
6128 sec->owner, sec);
6129 bfd_set_error (bfd_error_bad_value);
6130 return FALSE;
6131 }
6132
6133 /* Remove unused Official Procedure Descriptor entries. Currently we
6134 only remove those associated with functions in discarded link-once
6135 sections, or weakly defined functions that have been overridden. It
6136 would be possible to remove many more entries for statically linked
6137 applications. */
6138
6139 bfd_boolean
ppc64_elf_edit_opd(bfd * obfd,struct bfd_link_info * info,bfd_boolean no_opd_opt,bfd_boolean non_overlapping)6140 ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info,
6141 bfd_boolean no_opd_opt,
6142 bfd_boolean non_overlapping)
6143 {
6144 bfd *ibfd;
6145 bfd_boolean some_edited = FALSE;
6146 asection *need_pad = NULL;
6147
6148 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6149 {
6150 asection *sec;
6151 Elf_Internal_Rela *relstart, *rel, *relend;
6152 Elf_Internal_Shdr *symtab_hdr;
6153 Elf_Internal_Sym *local_syms;
6154 struct elf_link_hash_entry **sym_hashes;
6155 bfd_vma offset;
6156 bfd_size_type amt;
6157 long *opd_adjust;
6158 bfd_boolean need_edit, add_aux_fields;
6159 bfd_size_type cnt_16b = 0;
6160
6161 sec = bfd_get_section_by_name (ibfd, ".opd");
6162 if (sec == NULL || sec->size == 0)
6163 continue;
6164
6165 amt = sec->size * sizeof (long) / 8;
6166 opd_adjust = get_opd_info (sec);
6167 if (opd_adjust == NULL)
6168 {
6169 /* check_relocs hasn't been called. Must be a ld -r link
6170 or --just-symbols object. */
6171 opd_adjust = bfd_alloc (obfd, amt);
6172 if (opd_adjust == NULL)
6173 return FALSE;
6174 ppc64_elf_section_data (sec)->opd.adjust = opd_adjust;
6175 }
6176 memset (opd_adjust, 0, amt);
6177
6178 if (no_opd_opt)
6179 continue;
6180
6181 if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
6182 continue;
6183
6184 if (sec->output_section == bfd_abs_section_ptr)
6185 continue;
6186
6187 /* Look through the section relocs. */
6188 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0)
6189 continue;
6190
6191 local_syms = NULL;
6192 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6193 sym_hashes = elf_sym_hashes (ibfd);
6194
6195 /* Read the relocations. */
6196 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
6197 info->keep_memory);
6198 if (relstart == NULL)
6199 return FALSE;
6200
6201 /* First run through the relocs to check they are sane, and to
6202 determine whether we need to edit this opd section. */
6203 need_edit = FALSE;
6204 need_pad = sec;
6205 offset = 0;
6206 relend = relstart + sec->reloc_count;
6207 for (rel = relstart; rel < relend; )
6208 {
6209 enum elf_ppc64_reloc_type r_type;
6210 unsigned long r_symndx;
6211 asection *sym_sec;
6212 struct elf_link_hash_entry *h;
6213 Elf_Internal_Sym *sym;
6214
6215 /* .opd contains a regular array of 16 or 24 byte entries. We're
6216 only interested in the reloc pointing to a function entry
6217 point. */
6218 if (rel->r_offset != offset
6219 || rel + 1 >= relend
6220 || (rel + 1)->r_offset != offset + 8)
6221 {
6222 /* If someone messes with .opd alignment then after a
6223 "ld -r" we might have padding in the middle of .opd.
6224 Also, there's nothing to prevent someone putting
6225 something silly in .opd with the assembler. No .opd
6226 optimization for them! */
6227 broken_opd:
6228 (*_bfd_error_handler)
6229 (_("%B: .opd is not a regular array of opd entries"), ibfd);
6230 need_edit = FALSE;
6231 break;
6232 }
6233
6234 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64
6235 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC)
6236 {
6237 (*_bfd_error_handler)
6238 (_("%B: unexpected reloc type %u in .opd section"),
6239 ibfd, r_type);
6240 need_edit = FALSE;
6241 break;
6242 }
6243
6244 r_symndx = ELF64_R_SYM (rel->r_info);
6245 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
6246 r_symndx, ibfd))
6247 goto error_ret;
6248
6249 if (sym_sec == NULL || sym_sec->owner == NULL)
6250 {
6251 const char *sym_name;
6252 if (h != NULL)
6253 sym_name = h->root.root.string;
6254 else
6255 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym,
6256 sym_sec);
6257
6258 (*_bfd_error_handler)
6259 (_("%B: undefined sym `%s' in .opd section"),
6260 ibfd, sym_name);
6261 need_edit = FALSE;
6262 break;
6263 }
6264
6265 /* opd entries are always for functions defined in the
6266 current input bfd. If the symbol isn't defined in the
6267 input bfd, then we won't be using the function in this
6268 bfd; It must be defined in a linkonce section in another
6269 bfd, or is weak. It's also possible that we are
6270 discarding the function due to a linker script /DISCARD/,
6271 which we test for via the output_section. */
6272 if (sym_sec->owner != ibfd
6273 || sym_sec->output_section == bfd_abs_section_ptr)
6274 need_edit = TRUE;
6275
6276 rel += 2;
6277 if (rel == relend
6278 || (rel + 1 == relend && rel->r_offset == offset + 16))
6279 {
6280 if (sec->size == offset + 24)
6281 {
6282 need_pad = NULL;
6283 break;
6284 }
6285 if (rel == relend && sec->size == offset + 16)
6286 {
6287 cnt_16b++;
6288 break;
6289 }
6290 goto broken_opd;
6291 }
6292
6293 if (rel->r_offset == offset + 24)
6294 offset += 24;
6295 else if (rel->r_offset != offset + 16)
6296 goto broken_opd;
6297 else if (rel + 1 < relend
6298 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64
6299 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC)
6300 {
6301 offset += 16;
6302 cnt_16b++;
6303 }
6304 else if (rel + 2 < relend
6305 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64
6306 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC)
6307 {
6308 offset += 24;
6309 rel += 1;
6310 }
6311 else
6312 goto broken_opd;
6313 }
6314
6315 add_aux_fields = non_overlapping && cnt_16b > 0;
6316
6317 if (need_edit || add_aux_fields)
6318 {
6319 Elf_Internal_Rela *write_rel;
6320 bfd_byte *rptr, *wptr;
6321 bfd_byte *new_contents = NULL;
6322 bfd_boolean skip;
6323 long opd_ent_size;
6324
6325 /* This seems a waste of time as input .opd sections are all
6326 zeros as generated by gcc, but I suppose there's no reason
6327 this will always be so. We might start putting something in
6328 the third word of .opd entries. */
6329 if ((sec->flags & SEC_IN_MEMORY) == 0)
6330 {
6331 bfd_byte *loc;
6332 if (!bfd_malloc_and_get_section (ibfd, sec, &loc))
6333 {
6334 if (loc != NULL)
6335 free (loc);
6336 error_ret:
6337 if (local_syms != NULL
6338 && symtab_hdr->contents != (unsigned char *) local_syms)
6339 free (local_syms);
6340 if (elf_section_data (sec)->relocs != relstart)
6341 free (relstart);
6342 return FALSE;
6343 }
6344 sec->contents = loc;
6345 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS);
6346 }
6347
6348 elf_section_data (sec)->relocs = relstart;
6349
6350 new_contents = sec->contents;
6351 if (add_aux_fields)
6352 {
6353 new_contents = bfd_malloc (sec->size + cnt_16b * 8);
6354 if (new_contents == NULL)
6355 return FALSE;
6356 need_pad = FALSE;
6357 }
6358 wptr = new_contents;
6359 rptr = sec->contents;
6360
6361 write_rel = relstart;
6362 skip = FALSE;
6363 offset = 0;
6364 opd_ent_size = 0;
6365 for (rel = relstart; rel < relend; rel++)
6366 {
6367 unsigned long r_symndx;
6368 asection *sym_sec;
6369 struct elf_link_hash_entry *h;
6370 Elf_Internal_Sym *sym;
6371
6372 r_symndx = ELF64_R_SYM (rel->r_info);
6373 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
6374 r_symndx, ibfd))
6375 goto error_ret;
6376
6377 if (rel->r_offset == offset)
6378 {
6379 struct ppc_link_hash_entry *fdh = NULL;
6380
6381 /* See if the .opd entry is full 24 byte or
6382 16 byte (with fd_aux entry overlapped with next
6383 fd_func). */
6384 opd_ent_size = 24;
6385 if ((rel + 2 == relend && sec->size == offset + 16)
6386 || (rel + 3 < relend
6387 && rel[2].r_offset == offset + 16
6388 && rel[3].r_offset == offset + 24
6389 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64
6390 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC))
6391 opd_ent_size = 16;
6392
6393 if (h != NULL
6394 && h->root.root.string[0] == '.')
6395 {
6396 fdh = get_fdh ((struct ppc_link_hash_entry *) h,
6397 ppc_hash_table (info));
6398 if (fdh != NULL
6399 && fdh->elf.root.type != bfd_link_hash_defined
6400 && fdh->elf.root.type != bfd_link_hash_defweak)
6401 fdh = NULL;
6402 }
6403
6404 skip = (sym_sec->owner != ibfd
6405 || sym_sec->output_section == bfd_abs_section_ptr);
6406 if (skip)
6407 {
6408 if (fdh != NULL && sym_sec->owner == ibfd)
6409 {
6410 /* Arrange for the function descriptor sym
6411 to be dropped. */
6412 fdh->elf.root.u.def.value = 0;
6413 fdh->elf.root.u.def.section = sym_sec;
6414 }
6415 opd_adjust[rel->r_offset / 8] = -1;
6416 }
6417 else
6418 {
6419 /* We'll be keeping this opd entry. */
6420
6421 if (fdh != NULL)
6422 {
6423 /* Redefine the function descriptor symbol to
6424 this location in the opd section. It is
6425 necessary to update the value here rather
6426 than using an array of adjustments as we do
6427 for local symbols, because various places
6428 in the generic ELF code use the value
6429 stored in u.def.value. */
6430 fdh->elf.root.u.def.value = wptr - new_contents;
6431 fdh->adjust_done = 1;
6432 }
6433
6434 /* Local syms are a bit tricky. We could
6435 tweak them as they can be cached, but
6436 we'd need to look through the local syms
6437 for the function descriptor sym which we
6438 don't have at the moment. So keep an
6439 array of adjustments. */
6440 opd_adjust[rel->r_offset / 8]
6441 = (wptr - new_contents) - (rptr - sec->contents);
6442
6443 if (wptr != rptr)
6444 memcpy (wptr, rptr, opd_ent_size);
6445 wptr += opd_ent_size;
6446 if (add_aux_fields && opd_ent_size == 16)
6447 {
6448 memset (wptr, '\0', 8);
6449 wptr += 8;
6450 }
6451 }
6452 rptr += opd_ent_size;
6453 offset += opd_ent_size;
6454 }
6455
6456 if (skip)
6457 {
6458 if (!dec_dynrel_count (rel->r_info, sec, info,
6459 NULL, h, sym_sec))
6460 goto error_ret;
6461 }
6462 else
6463 {
6464 /* We need to adjust any reloc offsets to point to the
6465 new opd entries. While we're at it, we may as well
6466 remove redundant relocs. */
6467 rel->r_offset += opd_adjust[(offset - opd_ent_size) / 8];
6468 if (write_rel != rel)
6469 memcpy (write_rel, rel, sizeof (*rel));
6470 ++write_rel;
6471 }
6472 }
6473
6474 sec->size = wptr - new_contents;
6475 sec->reloc_count = write_rel - relstart;
6476 if (add_aux_fields)
6477 {
6478 free (sec->contents);
6479 sec->contents = new_contents;
6480 }
6481
6482 /* Fudge the size too, as this is used later in
6483 elf_bfd_final_link if we are emitting relocs. */
6484 elf_section_data (sec)->rel_hdr.sh_size
6485 = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize;
6486 BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL);
6487 some_edited = TRUE;
6488 }
6489 else if (elf_section_data (sec)->relocs != relstart)
6490 free (relstart);
6491
6492 if (local_syms != NULL
6493 && symtab_hdr->contents != (unsigned char *) local_syms)
6494 {
6495 if (!info->keep_memory)
6496 free (local_syms);
6497 else
6498 symtab_hdr->contents = (unsigned char *) local_syms;
6499 }
6500 }
6501
6502 if (some_edited)
6503 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL);
6504
6505 /* If we are doing a final link and the last .opd entry is just 16 byte
6506 long, add a 8 byte padding after it. */
6507 if (need_pad != NULL && !info->relocatable)
6508 {
6509 bfd_byte *p;
6510
6511 if ((need_pad->flags & SEC_IN_MEMORY) == 0)
6512 {
6513 BFD_ASSERT (need_pad->size > 0);
6514
6515 p = bfd_malloc (need_pad->size + 8);
6516 if (p == NULL)
6517 return FALSE;
6518
6519 if (! bfd_get_section_contents (need_pad->owner, need_pad,
6520 p, 0, need_pad->size))
6521 return FALSE;
6522
6523 need_pad->contents = p;
6524 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS);
6525 }
6526 else
6527 {
6528 p = bfd_realloc (need_pad->contents, need_pad->size + 8);
6529 if (p == NULL)
6530 return FALSE;
6531
6532 need_pad->contents = p;
6533 }
6534
6535 memset (need_pad->contents + need_pad->size, 0, 8);
6536 need_pad->size += 8;
6537 }
6538
6539 return TRUE;
6540 }
6541
6542 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
6543
6544 asection *
ppc64_elf_tls_setup(bfd * obfd,struct bfd_link_info * info)6545 ppc64_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
6546 {
6547 struct ppc_link_hash_table *htab;
6548
6549 htab = ppc_hash_table (info);
6550 if (htab->tls_get_addr != NULL)
6551 {
6552 struct ppc_link_hash_entry *h = htab->tls_get_addr;
6553
6554 while (h->elf.root.type == bfd_link_hash_indirect
6555 || h->elf.root.type == bfd_link_hash_warning)
6556 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link;
6557
6558 htab->tls_get_addr = h;
6559
6560 if (htab->tls_get_addr_fd == NULL
6561 && h->oh != NULL
6562 && h->oh->is_func_descriptor
6563 && (h->oh->elf.root.type == bfd_link_hash_defined
6564 || h->oh->elf.root.type == bfd_link_hash_defweak))
6565 htab->tls_get_addr_fd = h->oh;
6566 }
6567
6568 if (htab->tls_get_addr_fd != NULL)
6569 {
6570 struct ppc_link_hash_entry *h = htab->tls_get_addr_fd;
6571
6572 while (h->elf.root.type == bfd_link_hash_indirect
6573 || h->elf.root.type == bfd_link_hash_warning)
6574 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link;
6575
6576 htab->tls_get_addr_fd = h;
6577 }
6578
6579 return _bfd_elf_tls_setup (obfd, info);
6580 }
6581
6582 /* Run through all the TLS relocs looking for optimization
6583 opportunities. The linker has been hacked (see ppc64elf.em) to do
6584 a preliminary section layout so that we know the TLS segment
6585 offsets. We can't optimize earlier because some optimizations need
6586 to know the tp offset, and we need to optimize before allocating
6587 dynamic relocations. */
6588
6589 bfd_boolean
ppc64_elf_tls_optimize(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)6590 ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
6591 {
6592 bfd *ibfd;
6593 asection *sec;
6594 struct ppc_link_hash_table *htab;
6595
6596 if (info->relocatable || info->shared)
6597 return TRUE;
6598
6599 htab = ppc_hash_table (info);
6600 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6601 {
6602 Elf_Internal_Sym *locsyms = NULL;
6603
6604 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6605 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section))
6606 {
6607 Elf_Internal_Rela *relstart, *rel, *relend;
6608 int expecting_tls_get_addr;
6609
6610 /* Read the relocations. */
6611 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
6612 info->keep_memory);
6613 if (relstart == NULL)
6614 return FALSE;
6615
6616 expecting_tls_get_addr = 0;
6617 relend = relstart + sec->reloc_count;
6618 for (rel = relstart; rel < relend; rel++)
6619 {
6620 enum elf_ppc64_reloc_type r_type;
6621 unsigned long r_symndx;
6622 struct elf_link_hash_entry *h;
6623 Elf_Internal_Sym *sym;
6624 asection *sym_sec;
6625 char *tls_mask;
6626 char tls_set, tls_clear, tls_type = 0;
6627 bfd_vma value;
6628 bfd_boolean ok_tprel, is_local;
6629
6630 r_symndx = ELF64_R_SYM (rel->r_info);
6631 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms,
6632 r_symndx, ibfd))
6633 {
6634 err_free_rel:
6635 if (elf_section_data (sec)->relocs != relstart)
6636 free (relstart);
6637 if (locsyms != NULL
6638 && (elf_tdata (ibfd)->symtab_hdr.contents
6639 != (unsigned char *) locsyms))
6640 free (locsyms);
6641 return FALSE;
6642 }
6643
6644 if (h != NULL)
6645 {
6646 if (h->root.type != bfd_link_hash_defined
6647 && h->root.type != bfd_link_hash_defweak)
6648 continue;
6649 value = h->root.u.def.value;
6650 }
6651 else
6652 /* Symbols referenced by TLS relocs must be of type
6653 STT_TLS. So no need for .opd local sym adjust. */
6654 value = sym->st_value;
6655
6656 ok_tprel = FALSE;
6657 is_local = FALSE;
6658 if (h == NULL
6659 || !h->def_dynamic)
6660 {
6661 is_local = TRUE;
6662 value += sym_sec->output_offset;
6663 value += sym_sec->output_section->vma;
6664 value -= htab->elf.tls_sec->vma;
6665 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31)
6666 < (bfd_vma) 1 << 32);
6667 }
6668
6669 r_type = ELF64_R_TYPE (rel->r_info);
6670 switch (r_type)
6671 {
6672 case R_PPC64_GOT_TLSLD16:
6673 case R_PPC64_GOT_TLSLD16_LO:
6674 case R_PPC64_GOT_TLSLD16_HI:
6675 case R_PPC64_GOT_TLSLD16_HA:
6676 /* These relocs should never be against a symbol
6677 defined in a shared lib. Leave them alone if
6678 that turns out to be the case. */
6679 ppc64_tlsld_got (ibfd)->refcount -= 1;
6680 if (!is_local)
6681 continue;
6682
6683 /* LD -> LE */
6684 tls_set = 0;
6685 tls_clear = TLS_LD;
6686 tls_type = TLS_TLS | TLS_LD;
6687 expecting_tls_get_addr = 1;
6688 break;
6689
6690 case R_PPC64_GOT_TLSGD16:
6691 case R_PPC64_GOT_TLSGD16_LO:
6692 case R_PPC64_GOT_TLSGD16_HI:
6693 case R_PPC64_GOT_TLSGD16_HA:
6694 if (ok_tprel)
6695 /* GD -> LE */
6696 tls_set = 0;
6697 else
6698 /* GD -> IE */
6699 tls_set = TLS_TLS | TLS_TPRELGD;
6700 tls_clear = TLS_GD;
6701 tls_type = TLS_TLS | TLS_GD;
6702 expecting_tls_get_addr = 1;
6703 break;
6704
6705 case R_PPC64_GOT_TPREL16_DS:
6706 case R_PPC64_GOT_TPREL16_LO_DS:
6707 case R_PPC64_GOT_TPREL16_HI:
6708 case R_PPC64_GOT_TPREL16_HA:
6709 expecting_tls_get_addr = 0;
6710 if (ok_tprel)
6711 {
6712 /* IE -> LE */
6713 tls_set = 0;
6714 tls_clear = TLS_TPREL;
6715 tls_type = TLS_TLS | TLS_TPREL;
6716 break;
6717 }
6718 else
6719 continue;
6720
6721 case R_PPC64_REL14:
6722 case R_PPC64_REL14_BRTAKEN:
6723 case R_PPC64_REL14_BRNTAKEN:
6724 case R_PPC64_REL24:
6725 if (h != NULL
6726 && (h == &htab->tls_get_addr->elf
6727 || h == &htab->tls_get_addr_fd->elf))
6728 {
6729 if (!expecting_tls_get_addr
6730 && rel != relstart
6731 && ((ELF64_R_TYPE (rel[-1].r_info)
6732 == R_PPC64_TOC16)
6733 || (ELF64_R_TYPE (rel[-1].r_info)
6734 == R_PPC64_TOC16_LO)))
6735 {
6736 /* Check for toc tls entries. */
6737 char *toc_tls;
6738 int retval;
6739
6740 retval = get_tls_mask (&toc_tls, NULL, &locsyms,
6741 rel - 1, ibfd);
6742 if (retval == 0)
6743 goto err_free_rel;
6744 if (toc_tls != NULL)
6745 expecting_tls_get_addr = retval > 1;
6746 }
6747
6748 if (expecting_tls_get_addr)
6749 {
6750 struct plt_entry *ent;
6751 for (ent = h->plt.plist; ent; ent = ent->next)
6752 if (ent->addend == 0)
6753 {
6754 if (ent->plt.refcount > 0)
6755 ent->plt.refcount -= 1;
6756 break;
6757 }
6758 }
6759 }
6760 expecting_tls_get_addr = 0;
6761 continue;
6762
6763 case R_PPC64_TPREL64:
6764 expecting_tls_get_addr = 0;
6765 if (ok_tprel)
6766 {
6767 /* IE -> LE */
6768 tls_set = TLS_EXPLICIT;
6769 tls_clear = TLS_TPREL;
6770 break;
6771 }
6772 else
6773 continue;
6774
6775 case R_PPC64_DTPMOD64:
6776 expecting_tls_get_addr = 0;
6777 if (rel + 1 < relend
6778 && (rel[1].r_info
6779 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64))
6780 && rel[1].r_offset == rel->r_offset + 8)
6781 {
6782 if (ok_tprel)
6783 /* GD -> LE */
6784 tls_set = TLS_EXPLICIT | TLS_GD;
6785 else
6786 /* GD -> IE */
6787 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD;
6788 tls_clear = TLS_GD;
6789 }
6790 else
6791 {
6792 if (!is_local)
6793 continue;
6794
6795 /* LD -> LE */
6796 tls_set = TLS_EXPLICIT;
6797 tls_clear = TLS_LD;
6798 }
6799 break;
6800
6801 default:
6802 expecting_tls_get_addr = 0;
6803 continue;
6804 }
6805
6806 if ((tls_set & TLS_EXPLICIT) == 0)
6807 {
6808 struct got_entry *ent;
6809
6810 /* Adjust got entry for this reloc. */
6811 if (h != NULL)
6812 ent = h->got.glist;
6813 else
6814 ent = elf_local_got_ents (ibfd)[r_symndx];
6815
6816 for (; ent != NULL; ent = ent->next)
6817 if (ent->addend == rel->r_addend
6818 && ent->owner == ibfd
6819 && ent->tls_type == tls_type)
6820 break;
6821 if (ent == NULL)
6822 abort ();
6823
6824 if (tls_set == 0)
6825 {
6826 /* We managed to get rid of a got entry. */
6827 if (ent->got.refcount > 0)
6828 ent->got.refcount -= 1;
6829 }
6830 }
6831 else
6832 {
6833 /* If we got rid of a DTPMOD/DTPREL reloc pair then
6834 we'll lose one or two dyn relocs. */
6835 if (!dec_dynrel_count (rel->r_info, sec, info,
6836 NULL, h, sym_sec))
6837 return FALSE;
6838
6839 if (tls_set == (TLS_EXPLICIT | TLS_GD))
6840 {
6841 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info,
6842 NULL, h, sym_sec))
6843 return FALSE;
6844 }
6845 }
6846
6847 *tls_mask |= tls_set;
6848 *tls_mask &= ~tls_clear;
6849 }
6850
6851 if (elf_section_data (sec)->relocs != relstart)
6852 free (relstart);
6853 }
6854
6855 if (locsyms != NULL
6856 && (elf_tdata (ibfd)->symtab_hdr.contents
6857 != (unsigned char *) locsyms))
6858 {
6859 if (!info->keep_memory)
6860 free (locsyms);
6861 else
6862 elf_tdata (ibfd)->symtab_hdr.contents = (unsigned char *) locsyms;
6863 }
6864 }
6865 return TRUE;
6866 }
6867
6868 /* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust
6869 the values of any global symbols in a toc section that has been
6870 edited. Globals in toc sections should be a rarity, so this function
6871 sets a flag if any are found in toc sections other than the one just
6872 edited, so that futher hash table traversals can be avoided. */
6873
6874 struct adjust_toc_info
6875 {
6876 asection *toc;
6877 unsigned long *skip;
6878 bfd_boolean global_toc_syms;
6879 };
6880
6881 static bfd_boolean
adjust_toc_syms(struct elf_link_hash_entry * h,void * inf)6882 adjust_toc_syms (struct elf_link_hash_entry *h, void *inf)
6883 {
6884 struct ppc_link_hash_entry *eh;
6885 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf;
6886
6887 if (h->root.type == bfd_link_hash_indirect)
6888 return TRUE;
6889
6890 if (h->root.type == bfd_link_hash_warning)
6891 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6892
6893 if (h->root.type != bfd_link_hash_defined
6894 && h->root.type != bfd_link_hash_defweak)
6895 return TRUE;
6896
6897 eh = (struct ppc_link_hash_entry *) h;
6898 if (eh->adjust_done)
6899 return TRUE;
6900
6901 if (eh->elf.root.u.def.section == toc_inf->toc)
6902 {
6903 unsigned long skip = toc_inf->skip[eh->elf.root.u.def.value >> 3];
6904 if (skip != (unsigned long) -1)
6905 eh->elf.root.u.def.value -= skip;
6906 else
6907 {
6908 (*_bfd_error_handler)
6909 (_("%s defined in removed toc entry"), eh->elf.root.root.string);
6910 eh->elf.root.u.def.section = &bfd_abs_section;
6911 eh->elf.root.u.def.value = 0;
6912 }
6913 eh->adjust_done = 1;
6914 }
6915 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0)
6916 toc_inf->global_toc_syms = TRUE;
6917
6918 return TRUE;
6919 }
6920
6921 /* Examine all relocs referencing .toc sections in order to remove
6922 unused .toc entries. */
6923
6924 bfd_boolean
ppc64_elf_edit_toc(bfd * obfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)6925 ppc64_elf_edit_toc (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
6926 {
6927 bfd *ibfd;
6928 struct adjust_toc_info toc_inf;
6929
6930 toc_inf.global_toc_syms = TRUE;
6931 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6932 {
6933 asection *toc, *sec;
6934 Elf_Internal_Shdr *symtab_hdr;
6935 Elf_Internal_Sym *local_syms;
6936 struct elf_link_hash_entry **sym_hashes;
6937 Elf_Internal_Rela *relstart, *rel;
6938 unsigned long *skip, *drop;
6939 unsigned char *used;
6940 unsigned char *keep, last, some_unused;
6941
6942 toc = bfd_get_section_by_name (ibfd, ".toc");
6943 if (toc == NULL
6944 || toc->size == 0
6945 || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS
6946 || elf_discarded_section (toc))
6947 continue;
6948
6949 local_syms = NULL;
6950 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6951 sym_hashes = elf_sym_hashes (ibfd);
6952
6953 /* Look at sections dropped from the final link. */
6954 skip = NULL;
6955 relstart = NULL;
6956 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6957 {
6958 if (sec->reloc_count == 0
6959 || !elf_discarded_section (sec)
6960 || get_opd_info (sec)
6961 || (sec->flags & SEC_ALLOC) == 0
6962 || (sec->flags & SEC_DEBUGGING) != 0)
6963 continue;
6964
6965 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE);
6966 if (relstart == NULL)
6967 goto error_ret;
6968
6969 /* Run through the relocs to see which toc entries might be
6970 unused. */
6971 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
6972 {
6973 enum elf_ppc64_reloc_type r_type;
6974 unsigned long r_symndx;
6975 asection *sym_sec;
6976 struct elf_link_hash_entry *h;
6977 Elf_Internal_Sym *sym;
6978 bfd_vma val;
6979
6980 r_type = ELF64_R_TYPE (rel->r_info);
6981 switch (r_type)
6982 {
6983 default:
6984 continue;
6985
6986 case R_PPC64_TOC16:
6987 case R_PPC64_TOC16_LO:
6988 case R_PPC64_TOC16_HI:
6989 case R_PPC64_TOC16_HA:
6990 case R_PPC64_TOC16_DS:
6991 case R_PPC64_TOC16_LO_DS:
6992 break;
6993 }
6994
6995 r_symndx = ELF64_R_SYM (rel->r_info);
6996 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
6997 r_symndx, ibfd))
6998 goto error_ret;
6999
7000 if (sym_sec != toc)
7001 continue;
7002
7003 if (h != NULL)
7004 val = h->root.u.def.value;
7005 else
7006 val = sym->st_value;
7007 val += rel->r_addend;
7008
7009 if (val >= toc->size)
7010 continue;
7011
7012 /* Anything in the toc ought to be aligned to 8 bytes.
7013 If not, don't mark as unused. */
7014 if (val & 7)
7015 continue;
7016
7017 if (skip == NULL)
7018 {
7019 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 7) / 8);
7020 if (skip == NULL)
7021 goto error_ret;
7022 }
7023
7024 skip[val >> 3] = 1;
7025 }
7026
7027 if (elf_section_data (sec)->relocs != relstart)
7028 free (relstart);
7029 }
7030
7031 if (skip == NULL)
7032 continue;
7033
7034 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8);
7035 if (used == NULL)
7036 {
7037 error_ret:
7038 if (local_syms != NULL
7039 && symtab_hdr->contents != (unsigned char *) local_syms)
7040 free (local_syms);
7041 if (sec != NULL
7042 && relstart != NULL
7043 && elf_section_data (sec)->relocs != relstart)
7044 free (relstart);
7045 if (skip != NULL)
7046 free (skip);
7047 return FALSE;
7048 }
7049
7050 /* Now check all kept sections that might reference the toc. */
7051 for (sec = ibfd->sections;
7052 sec != NULL;
7053 /* Check the toc itself last. */
7054 sec = (sec == toc ? NULL
7055 : sec->next == toc && sec->next->next ? sec->next->next
7056 : sec->next == NULL ? toc
7057 : sec->next))
7058 {
7059 int repeat;
7060
7061 if (sec->reloc_count == 0
7062 || elf_discarded_section (sec)
7063 || get_opd_info (sec)
7064 || (sec->flags & SEC_ALLOC) == 0
7065 || (sec->flags & SEC_DEBUGGING) != 0)
7066 continue;
7067
7068 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, TRUE);
7069 if (relstart == NULL)
7070 goto error_ret;
7071
7072 /* Mark toc entries referenced as used. */
7073 repeat = 0;
7074 do
7075 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
7076 {
7077 enum elf_ppc64_reloc_type r_type;
7078 unsigned long r_symndx;
7079 asection *sym_sec;
7080 struct elf_link_hash_entry *h;
7081 Elf_Internal_Sym *sym;
7082 bfd_vma val;
7083
7084 r_type = ELF64_R_TYPE (rel->r_info);
7085 switch (r_type)
7086 {
7087 case R_PPC64_TOC16:
7088 case R_PPC64_TOC16_LO:
7089 case R_PPC64_TOC16_HI:
7090 case R_PPC64_TOC16_HA:
7091 case R_PPC64_TOC16_DS:
7092 case R_PPC64_TOC16_LO_DS:
7093 /* In case we're taking addresses of toc entries. */
7094 case R_PPC64_ADDR64:
7095 break;
7096
7097 default:
7098 continue;
7099 }
7100
7101 r_symndx = ELF64_R_SYM (rel->r_info);
7102 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
7103 r_symndx, ibfd))
7104 {
7105 free (used);
7106 goto error_ret;
7107 }
7108
7109 if (sym_sec != toc)
7110 continue;
7111
7112 if (h != NULL)
7113 val = h->root.u.def.value;
7114 else
7115 val = sym->st_value;
7116 val += rel->r_addend;
7117
7118 if (val >= toc->size)
7119 continue;
7120
7121 /* For the toc section, we only mark as used if
7122 this entry itself isn't unused. */
7123 if (sec == toc
7124 && !used[val >> 3]
7125 && (used[rel->r_offset >> 3]
7126 || !skip[rel->r_offset >> 3]))
7127 /* Do all the relocs again, to catch reference
7128 chains. */
7129 repeat = 1;
7130
7131 used[val >> 3] = 1;
7132 }
7133 while (repeat);
7134 }
7135
7136 /* Merge the used and skip arrays. Assume that TOC
7137 doublewords not appearing as either used or unused belong
7138 to to an entry more than one doubleword in size. */
7139 for (drop = skip, keep = used, last = 0, some_unused = 0;
7140 drop < skip + (toc->size + 7) / 8;
7141 ++drop, ++keep)
7142 {
7143 if (*keep)
7144 {
7145 *drop = 0;
7146 last = 0;
7147 }
7148 else if (*drop)
7149 {
7150 some_unused = 1;
7151 last = 1;
7152 }
7153 else
7154 *drop = last;
7155 }
7156
7157 free (used);
7158
7159 if (some_unused)
7160 {
7161 bfd_byte *contents, *src;
7162 unsigned long off;
7163
7164 /* Shuffle the toc contents, and at the same time convert the
7165 skip array from booleans into offsets. */
7166 if (!bfd_malloc_and_get_section (ibfd, toc, &contents))
7167 goto error_ret;
7168
7169 elf_section_data (toc)->this_hdr.contents = contents;
7170
7171 for (src = contents, off = 0, drop = skip;
7172 src < contents + toc->size;
7173 src += 8, ++drop)
7174 {
7175 if (*drop)
7176 {
7177 *drop = (unsigned long) -1;
7178 off += 8;
7179 }
7180 else if (off != 0)
7181 {
7182 *drop = off;
7183 memcpy (src - off, src, 8);
7184 }
7185 }
7186 toc->rawsize = toc->size;
7187 toc->size = src - contents - off;
7188
7189 if (toc->reloc_count != 0)
7190 {
7191 Elf_Internal_Rela *wrel;
7192 bfd_size_type sz;
7193
7194 /* Read toc relocs. */
7195 relstart = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL,
7196 TRUE);
7197 if (relstart == NULL)
7198 goto error_ret;
7199
7200 /* Remove unused toc relocs, and adjust those we keep. */
7201 wrel = relstart;
7202 for (rel = relstart; rel < relstart + toc->reloc_count; ++rel)
7203 if (skip[rel->r_offset >> 3] != (unsigned long) -1)
7204 {
7205 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3];
7206 wrel->r_info = rel->r_info;
7207 wrel->r_addend = rel->r_addend;
7208 ++wrel;
7209 }
7210 else if (!dec_dynrel_count (rel->r_info, toc, info,
7211 &local_syms, NULL, NULL))
7212 goto error_ret;
7213
7214 toc->reloc_count = wrel - relstart;
7215 sz = elf_section_data (toc)->rel_hdr.sh_entsize;
7216 elf_section_data (toc)->rel_hdr.sh_size = toc->reloc_count * sz;
7217 BFD_ASSERT (elf_section_data (toc)->rel_hdr2 == NULL);
7218 }
7219
7220 /* Adjust addends for relocs against the toc section sym. */
7221 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
7222 {
7223 if (sec->reloc_count == 0
7224 || elf_discarded_section (sec))
7225 continue;
7226
7227 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL,
7228 TRUE);
7229 if (relstart == NULL)
7230 goto error_ret;
7231
7232 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel)
7233 {
7234 enum elf_ppc64_reloc_type r_type;
7235 unsigned long r_symndx;
7236 asection *sym_sec;
7237 struct elf_link_hash_entry *h;
7238 Elf_Internal_Sym *sym;
7239
7240 r_type = ELF64_R_TYPE (rel->r_info);
7241 switch (r_type)
7242 {
7243 default:
7244 continue;
7245
7246 case R_PPC64_TOC16:
7247 case R_PPC64_TOC16_LO:
7248 case R_PPC64_TOC16_HI:
7249 case R_PPC64_TOC16_HA:
7250 case R_PPC64_TOC16_DS:
7251 case R_PPC64_TOC16_LO_DS:
7252 case R_PPC64_ADDR64:
7253 break;
7254 }
7255
7256 r_symndx = ELF64_R_SYM (rel->r_info);
7257 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
7258 r_symndx, ibfd))
7259 goto error_ret;
7260
7261 if (sym_sec != toc || h != NULL || sym->st_value != 0)
7262 continue;
7263
7264 rel->r_addend -= skip[rel->r_addend >> 3];
7265 }
7266 }
7267
7268 /* We shouldn't have local or global symbols defined in the TOC,
7269 but handle them anyway. */
7270 if (local_syms != NULL)
7271 {
7272 Elf_Internal_Sym *sym;
7273
7274 for (sym = local_syms;
7275 sym < local_syms + symtab_hdr->sh_info;
7276 ++sym)
7277 if (sym->st_shndx != SHN_UNDEF
7278 && (sym->st_shndx < SHN_LORESERVE
7279 || sym->st_shndx > SHN_HIRESERVE)
7280 && sym->st_value != 0
7281 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc)
7282 {
7283 if (skip[sym->st_value >> 3] != (unsigned long) -1)
7284 sym->st_value -= skip[sym->st_value >> 3];
7285 else
7286 {
7287 (*_bfd_error_handler)
7288 (_("%s defined in removed toc entry"),
7289 bfd_elf_sym_name (ibfd, symtab_hdr, sym,
7290 NULL));
7291 sym->st_value = 0;
7292 sym->st_shndx = SHN_ABS;
7293 }
7294 symtab_hdr->contents = (unsigned char *) local_syms;
7295 }
7296 }
7297
7298 /* Finally, adjust any global syms defined in the toc. */
7299 if (toc_inf.global_toc_syms)
7300 {
7301 toc_inf.toc = toc;
7302 toc_inf.skip = skip;
7303 toc_inf.global_toc_syms = FALSE;
7304 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms,
7305 &toc_inf);
7306 }
7307 }
7308
7309 if (local_syms != NULL
7310 && symtab_hdr->contents != (unsigned char *) local_syms)
7311 {
7312 if (!info->keep_memory)
7313 free (local_syms);
7314 else
7315 symtab_hdr->contents = (unsigned char *) local_syms;
7316 }
7317 free (skip);
7318 }
7319
7320 return TRUE;
7321 }
7322
7323 /* Allocate space in .plt, .got and associated reloc sections for
7324 dynamic relocs. */
7325
7326 static bfd_boolean
allocate_dynrelocs(struct elf_link_hash_entry * h,void * inf)7327 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
7328 {
7329 struct bfd_link_info *info;
7330 struct ppc_link_hash_table *htab;
7331 asection *s;
7332 struct ppc_link_hash_entry *eh;
7333 struct ppc_dyn_relocs *p;
7334 struct got_entry *gent;
7335
7336 if (h->root.type == bfd_link_hash_indirect)
7337 return TRUE;
7338
7339 if (h->root.type == bfd_link_hash_warning)
7340 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7341
7342 info = (struct bfd_link_info *) inf;
7343 htab = ppc_hash_table (info);
7344
7345 if (htab->elf.dynamic_sections_created
7346 && h->dynindx != -1
7347 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h))
7348 {
7349 struct plt_entry *pent;
7350 bfd_boolean doneone = FALSE;
7351 for (pent = h->plt.plist; pent != NULL; pent = pent->next)
7352 if (pent->plt.refcount > 0)
7353 {
7354 /* If this is the first .plt entry, make room for the special
7355 first entry. */
7356 s = htab->plt;
7357 if (s->size == 0)
7358 s->size += PLT_INITIAL_ENTRY_SIZE;
7359
7360 pent->plt.offset = s->size;
7361
7362 /* Make room for this entry. */
7363 s->size += PLT_ENTRY_SIZE;
7364
7365 /* Make room for the .glink code. */
7366 s = htab->glink;
7367 if (s->size == 0)
7368 s->size += GLINK_CALL_STUB_SIZE;
7369 /* We need bigger stubs past index 32767. */
7370 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4)
7371 s->size += 4;
7372 s->size += 2*4;
7373
7374 /* We also need to make an entry in the .rela.plt section. */
7375 s = htab->relplt;
7376 s->size += sizeof (Elf64_External_Rela);
7377 doneone = TRUE;
7378 }
7379 else
7380 pent->plt.offset = (bfd_vma) -1;
7381 if (!doneone)
7382 {
7383 h->plt.plist = NULL;
7384 h->needs_plt = 0;
7385 }
7386 }
7387 else
7388 {
7389 h->plt.plist = NULL;
7390 h->needs_plt = 0;
7391 }
7392
7393 eh = (struct ppc_link_hash_entry *) h;
7394 /* Run through the TLS GD got entries first if we're changing them
7395 to TPREL. */
7396 if ((eh->tls_mask & TLS_TPRELGD) != 0)
7397 for (gent = h->got.glist; gent != NULL; gent = gent->next)
7398 if (gent->got.refcount > 0
7399 && (gent->tls_type & TLS_GD) != 0)
7400 {
7401 /* This was a GD entry that has been converted to TPREL. If
7402 there happens to be a TPREL entry we can use that one. */
7403 struct got_entry *ent;
7404 for (ent = h->got.glist; ent != NULL; ent = ent->next)
7405 if (ent->got.refcount > 0
7406 && (ent->tls_type & TLS_TPREL) != 0
7407 && ent->addend == gent->addend
7408 && ent->owner == gent->owner)
7409 {
7410 gent->got.refcount = 0;
7411 break;
7412 }
7413
7414 /* If not, then we'll be using our own TPREL entry. */
7415 if (gent->got.refcount != 0)
7416 gent->tls_type = TLS_TLS | TLS_TPREL;
7417 }
7418
7419 for (gent = h->got.glist; gent != NULL; gent = gent->next)
7420 if (gent->got.refcount > 0)
7421 {
7422 bfd_boolean dyn;
7423
7424 /* Make sure this symbol is output as a dynamic symbol.
7425 Undefined weak syms won't yet be marked as dynamic,
7426 nor will all TLS symbols. */
7427 if (h->dynindx == -1
7428 && !h->forced_local)
7429 {
7430 if (! bfd_elf_link_record_dynamic_symbol (info, h))
7431 return FALSE;
7432 }
7433
7434 if ((gent->tls_type & TLS_LD) != 0
7435 && !h->def_dynamic)
7436 {
7437 gent->got.offset = ppc64_tlsld_got (gent->owner)->offset;
7438 continue;
7439 }
7440
7441 s = ppc64_elf_tdata (gent->owner)->got;
7442 gent->got.offset = s->size;
7443 s->size
7444 += (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD)) ? 16 : 8;
7445 dyn = htab->elf.dynamic_sections_created;
7446 if ((info->shared
7447 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))
7448 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
7449 || h->root.type != bfd_link_hash_undefweak))
7450 ppc64_elf_tdata (gent->owner)->relgot->size
7451 += (gent->tls_type & eh->tls_mask & TLS_GD
7452 ? 2 * sizeof (Elf64_External_Rela)
7453 : sizeof (Elf64_External_Rela));
7454 }
7455 else
7456 gent->got.offset = (bfd_vma) -1;
7457
7458 if (eh->dyn_relocs == NULL)
7459 return TRUE;
7460
7461 /* In the shared -Bsymbolic case, discard space allocated for
7462 dynamic pc-relative relocs against symbols which turn out to be
7463 defined in regular objects. For the normal shared case, discard
7464 space for relocs that have become local due to symbol visibility
7465 changes. */
7466
7467 if (info->shared)
7468 {
7469 /* Relocs that use pc_count are those that appear on a call insn,
7470 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
7471 generated via assembly. We want calls to protected symbols to
7472 resolve directly to the function rather than going via the plt.
7473 If people want function pointer comparisons to work as expected
7474 then they should avoid writing weird assembly. */
7475 if (SYMBOL_CALLS_LOCAL (info, h))
7476 {
7477 struct ppc_dyn_relocs **pp;
7478
7479 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
7480 {
7481 p->count -= p->pc_count;
7482 p->pc_count = 0;
7483 if (p->count == 0)
7484 *pp = p->next;
7485 else
7486 pp = &p->next;
7487 }
7488 }
7489
7490 /* Also discard relocs on undefined weak syms with non-default
7491 visibility. */
7492 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
7493 && h->root.type == bfd_link_hash_undefweak)
7494 eh->dyn_relocs = NULL;
7495 }
7496 else if (ELIMINATE_COPY_RELOCS)
7497 {
7498 /* For the non-shared case, discard space for relocs against
7499 symbols which turn out to need copy relocs or are not
7500 dynamic. */
7501
7502 if (!h->non_got_ref
7503 && h->def_dynamic
7504 && !h->def_regular)
7505 {
7506 /* Make sure this symbol is output as a dynamic symbol.
7507 Undefined weak syms won't yet be marked as dynamic. */
7508 if (h->dynindx == -1
7509 && !h->forced_local)
7510 {
7511 if (! bfd_elf_link_record_dynamic_symbol (info, h))
7512 return FALSE;
7513 }
7514
7515 /* If that succeeded, we know we'll be keeping all the
7516 relocs. */
7517 if (h->dynindx != -1)
7518 goto keep;
7519 }
7520
7521 eh->dyn_relocs = NULL;
7522
7523 keep: ;
7524 }
7525
7526 /* Finally, allocate space. */
7527 for (p = eh->dyn_relocs; p != NULL; p = p->next)
7528 {
7529 asection *sreloc = elf_section_data (p->sec)->sreloc;
7530 sreloc->size += p->count * sizeof (Elf64_External_Rela);
7531 }
7532
7533 return TRUE;
7534 }
7535
7536 /* Find any dynamic relocs that apply to read-only sections. */
7537
7538 static bfd_boolean
readonly_dynrelocs(struct elf_link_hash_entry * h,void * inf)7539 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
7540 {
7541 struct ppc_link_hash_entry *eh;
7542 struct ppc_dyn_relocs *p;
7543
7544 if (h->root.type == bfd_link_hash_warning)
7545 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7546
7547 eh = (struct ppc_link_hash_entry *) h;
7548 for (p = eh->dyn_relocs; p != NULL; p = p->next)
7549 {
7550 asection *s = p->sec->output_section;
7551
7552 if (s != NULL && (s->flags & SEC_READONLY) != 0)
7553 {
7554 struct bfd_link_info *info = inf;
7555
7556 info->flags |= DF_TEXTREL;
7557
7558 /* Not an error, just cut short the traversal. */
7559 return FALSE;
7560 }
7561 }
7562 return TRUE;
7563 }
7564
7565 /* Set the sizes of the dynamic sections. */
7566
7567 static bfd_boolean
ppc64_elf_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)7568 ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
7569 struct bfd_link_info *info)
7570 {
7571 struct ppc_link_hash_table *htab;
7572 bfd *dynobj;
7573 asection *s;
7574 bfd_boolean relocs;
7575 bfd *ibfd;
7576
7577 htab = ppc_hash_table (info);
7578 dynobj = htab->elf.dynobj;
7579 if (dynobj == NULL)
7580 abort ();
7581
7582 if (htab->elf.dynamic_sections_created)
7583 {
7584 /* Set the contents of the .interp section to the interpreter. */
7585 if (info->executable)
7586 {
7587 s = bfd_get_section_by_name (dynobj, ".interp");
7588 if (s == NULL)
7589 abort ();
7590 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
7591 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
7592 }
7593 }
7594
7595 /* Set up .got offsets for local syms, and space for local dynamic
7596 relocs. */
7597 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
7598 {
7599 struct got_entry **lgot_ents;
7600 struct got_entry **end_lgot_ents;
7601 char *lgot_masks;
7602 bfd_size_type locsymcount;
7603 Elf_Internal_Shdr *symtab_hdr;
7604 asection *srel;
7605
7606 if (!is_ppc64_elf_target (ibfd->xvec))
7607 continue;
7608
7609 if (ppc64_tlsld_got (ibfd)->refcount > 0)
7610 {
7611 s = ppc64_elf_tdata (ibfd)->got;
7612 ppc64_tlsld_got (ibfd)->offset = s->size;
7613 s->size += 16;
7614 if (info->shared)
7615 {
7616 srel = ppc64_elf_tdata (ibfd)->relgot;
7617 srel->size += sizeof (Elf64_External_Rela);
7618 }
7619 }
7620 else
7621 ppc64_tlsld_got (ibfd)->offset = (bfd_vma) -1;
7622
7623 for (s = ibfd->sections; s != NULL; s = s->next)
7624 {
7625 struct ppc_dyn_relocs *p;
7626
7627 for (p = *((struct ppc_dyn_relocs **)
7628 &elf_section_data (s)->local_dynrel);
7629 p != NULL;
7630 p = p->next)
7631 {
7632 if (!bfd_is_abs_section (p->sec)
7633 && bfd_is_abs_section (p->sec->output_section))
7634 {
7635 /* Input section has been discarded, either because
7636 it is a copy of a linkonce section or due to
7637 linker script /DISCARD/, so we'll be discarding
7638 the relocs too. */
7639 }
7640 else if (p->count != 0)
7641 {
7642 srel = elf_section_data (p->sec)->sreloc;
7643 srel->size += p->count * sizeof (Elf64_External_Rela);
7644 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
7645 info->flags |= DF_TEXTREL;
7646 }
7647 }
7648 }
7649
7650 lgot_ents = elf_local_got_ents (ibfd);
7651 if (!lgot_ents)
7652 continue;
7653
7654 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
7655 locsymcount = symtab_hdr->sh_info;
7656 end_lgot_ents = lgot_ents + locsymcount;
7657 lgot_masks = (char *) end_lgot_ents;
7658 s = ppc64_elf_tdata (ibfd)->got;
7659 srel = ppc64_elf_tdata (ibfd)->relgot;
7660 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks)
7661 {
7662 struct got_entry *ent;
7663
7664 for (ent = *lgot_ents; ent != NULL; ent = ent->next)
7665 if (ent->got.refcount > 0)
7666 {
7667 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0)
7668 {
7669 if (ppc64_tlsld_got (ibfd)->offset == (bfd_vma) -1)
7670 {
7671 ppc64_tlsld_got (ibfd)->offset = s->size;
7672 s->size += 16;
7673 if (info->shared)
7674 srel->size += sizeof (Elf64_External_Rela);
7675 }
7676 ent->got.offset = ppc64_tlsld_got (ibfd)->offset;
7677 }
7678 else
7679 {
7680 ent->got.offset = s->size;
7681 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0)
7682 {
7683 s->size += 16;
7684 if (info->shared)
7685 srel->size += 2 * sizeof (Elf64_External_Rela);
7686 }
7687 else
7688 {
7689 s->size += 8;
7690 if (info->shared)
7691 srel->size += sizeof (Elf64_External_Rela);
7692 }
7693 }
7694 }
7695 else
7696 ent->got.offset = (bfd_vma) -1;
7697 }
7698 }
7699
7700 /* Allocate global sym .plt and .got entries, and space for global
7701 sym dynamic relocs. */
7702 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
7703
7704 /* We now have determined the sizes of the various dynamic sections.
7705 Allocate memory for them. */
7706 relocs = FALSE;
7707 for (s = dynobj->sections; s != NULL; s = s->next)
7708 {
7709 if ((s->flags & SEC_LINKER_CREATED) == 0)
7710 continue;
7711
7712 if (s == htab->brlt || s == htab->relbrlt)
7713 /* These haven't been allocated yet; don't strip. */
7714 continue;
7715 else if (s == htab->got
7716 || s == htab->plt
7717 || s == htab->glink)
7718 {
7719 /* Strip this section if we don't need it; see the
7720 comment below. */
7721 }
7722 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
7723 {
7724 if (s->size == 0)
7725 {
7726 /* If we don't need this section, strip it from the
7727 output file. This is mostly to handle .rela.bss and
7728 .rela.plt. We must create both sections in
7729 create_dynamic_sections, because they must be created
7730 before the linker maps input sections to output
7731 sections. The linker does that before
7732 adjust_dynamic_symbol is called, and it is that
7733 function which decides whether anything needs to go
7734 into these sections. */
7735 }
7736 else
7737 {
7738 if (s != htab->relplt)
7739 relocs = TRUE;
7740
7741 /* We use the reloc_count field as a counter if we need
7742 to copy relocs into the output file. */
7743 s->reloc_count = 0;
7744 }
7745 }
7746 else
7747 {
7748 /* It's not one of our sections, so don't allocate space. */
7749 continue;
7750 }
7751
7752 if (s->size == 0)
7753 {
7754 s->flags |= SEC_EXCLUDE;
7755 continue;
7756 }
7757
7758 /* .plt is in the bss section. We don't initialise it. */
7759 if (s == htab->plt)
7760 continue;
7761
7762 /* Allocate memory for the section contents. We use bfd_zalloc
7763 here in case unused entries are not reclaimed before the
7764 section's contents are written out. This should not happen,
7765 but this way if it does we get a R_PPC64_NONE reloc in .rela
7766 sections instead of garbage.
7767 We also rely on the section contents being zero when writing
7768 the GOT. */
7769 s->contents = bfd_zalloc (dynobj, s->size);
7770 if (s->contents == NULL)
7771 return FALSE;
7772 }
7773
7774 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
7775 {
7776 if (!is_ppc64_elf_target (ibfd->xvec))
7777 continue;
7778
7779 s = ppc64_elf_tdata (ibfd)->got;
7780 if (s != NULL && s != htab->got)
7781 {
7782 if (s->size == 0)
7783 s->flags |= SEC_EXCLUDE;
7784 else
7785 {
7786 s->contents = bfd_zalloc (ibfd, s->size);
7787 if (s->contents == NULL)
7788 return FALSE;
7789 }
7790 }
7791 s = ppc64_elf_tdata (ibfd)->relgot;
7792 if (s != NULL)
7793 {
7794 if (s->size == 0)
7795 s->flags |= SEC_EXCLUDE;
7796 else
7797 {
7798 s->contents = bfd_zalloc (ibfd, s->size);
7799 if (s->contents == NULL)
7800 return FALSE;
7801 relocs = TRUE;
7802 s->reloc_count = 0;
7803 }
7804 }
7805 }
7806
7807 if (htab->elf.dynamic_sections_created)
7808 {
7809 /* Add some entries to the .dynamic section. We fill in the
7810 values later, in ppc64_elf_finish_dynamic_sections, but we
7811 must add the entries now so that we get the correct size for
7812 the .dynamic section. The DT_DEBUG entry is filled in by the
7813 dynamic linker and used by the debugger. */
7814 #define add_dynamic_entry(TAG, VAL) \
7815 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
7816
7817 if (info->executable)
7818 {
7819 if (!add_dynamic_entry (DT_DEBUG, 0))
7820 return FALSE;
7821 }
7822
7823 if (htab->plt != NULL && htab->plt->size != 0)
7824 {
7825 if (!add_dynamic_entry (DT_PLTGOT, 0)
7826 || !add_dynamic_entry (DT_PLTRELSZ, 0)
7827 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
7828 || !add_dynamic_entry (DT_JMPREL, 0)
7829 || !add_dynamic_entry (DT_PPC64_GLINK, 0))
7830 return FALSE;
7831 }
7832
7833 if (NO_OPD_RELOCS)
7834 {
7835 if (!add_dynamic_entry (DT_PPC64_OPD, 0)
7836 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0))
7837 return FALSE;
7838 }
7839
7840 if (relocs)
7841 {
7842 if (!add_dynamic_entry (DT_RELA, 0)
7843 || !add_dynamic_entry (DT_RELASZ, 0)
7844 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
7845 return FALSE;
7846
7847 /* If any dynamic relocs apply to a read-only section,
7848 then we need a DT_TEXTREL entry. */
7849 if ((info->flags & DF_TEXTREL) == 0)
7850 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
7851
7852 if ((info->flags & DF_TEXTREL) != 0)
7853 {
7854 if (!add_dynamic_entry (DT_TEXTREL, 0))
7855 return FALSE;
7856 }
7857 }
7858 }
7859 #undef add_dynamic_entry
7860
7861 return TRUE;
7862 }
7863
7864 /* Determine the type of stub needed, if any, for a call. */
7865
7866 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)7867 ppc_type_of_stub (asection *input_sec,
7868 const Elf_Internal_Rela *rel,
7869 struct ppc_link_hash_entry **hash,
7870 bfd_vma destination)
7871 {
7872 struct ppc_link_hash_entry *h = *hash;
7873 bfd_vma location;
7874 bfd_vma branch_offset;
7875 bfd_vma max_branch_offset;
7876 enum elf_ppc64_reloc_type r_type;
7877
7878 if (h != NULL)
7879 {
7880 if (h->oh != NULL
7881 && h->oh->is_func_descriptor)
7882 h = h->oh;
7883
7884 if (h->elf.dynindx != -1)
7885 {
7886 struct plt_entry *ent;
7887
7888 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next)
7889 if (ent->addend == rel->r_addend
7890 && ent->plt.offset != (bfd_vma) -1)
7891 {
7892 *hash = h;
7893 return ppc_stub_plt_call;
7894 }
7895 }
7896
7897 if (!(h->elf.root.type == bfd_link_hash_defined
7898 || h->elf.root.type == bfd_link_hash_defweak)
7899 || h->elf.root.u.def.section->output_section == NULL)
7900 return ppc_stub_none;
7901 }
7902
7903 /* Determine where the call point is. */
7904 location = (input_sec->output_offset
7905 + input_sec->output_section->vma
7906 + rel->r_offset);
7907
7908 branch_offset = destination - location;
7909 r_type = ELF64_R_TYPE (rel->r_info);
7910
7911 /* Determine if a long branch stub is needed. */
7912 max_branch_offset = 1 << 25;
7913 if (r_type != R_PPC64_REL24)
7914 max_branch_offset = 1 << 15;
7915
7916 if (branch_offset + max_branch_offset >= 2 * max_branch_offset)
7917 /* We need a stub. Figure out whether a long_branch or plt_branch
7918 is needed later. */
7919 return ppc_stub_long_branch;
7920
7921 return ppc_stub_none;
7922 }
7923
7924 /* Build a .plt call stub. */
7925
7926 static inline bfd_byte *
build_plt_stub(bfd * obfd,bfd_byte * p,int offset)7927 build_plt_stub (bfd *obfd, bfd_byte *p, int offset)
7928 {
7929 #define PPC_LO(v) ((v) & 0xffff)
7930 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7931 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7932
7933 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4;
7934 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
7935 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
7936 if (PPC_HA (offset + 8) != PPC_HA (offset))
7937 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4;
7938 offset += 8;
7939 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset), p), p += 4;
7940 if (PPC_HA (offset + 8) != PPC_HA (offset))
7941 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4;
7942 offset += 8;
7943 bfd_put_32 (obfd, MTCTR_R11, p), p += 4;
7944 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4;
7945 bfd_put_32 (obfd, BCTR, p), p += 4;
7946 return p;
7947 }
7948
7949 static bfd_boolean
ppc_build_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)7950 ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
7951 {
7952 struct ppc_stub_hash_entry *stub_entry;
7953 struct ppc_branch_hash_entry *br_entry;
7954 struct bfd_link_info *info;
7955 struct ppc_link_hash_table *htab;
7956 bfd_byte *loc;
7957 bfd_byte *p;
7958 unsigned int indx;
7959 struct plt_entry *ent;
7960 bfd_vma dest, off;
7961 int size;
7962
7963 /* Massage our args to the form they really have. */
7964 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
7965 info = in_arg;
7966
7967 htab = ppc_hash_table (info);
7968
7969 /* Make a note of the offset within the stubs for this entry. */
7970 stub_entry->stub_offset = stub_entry->stub_sec->size;
7971 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset;
7972
7973 htab->stub_count[stub_entry->stub_type - 1] += 1;
7974 switch (stub_entry->stub_type)
7975 {
7976 case ppc_stub_long_branch:
7977 case ppc_stub_long_branch_r2off:
7978 /* Branches are relative. This is where we are going to. */
7979 off = dest = (stub_entry->target_value
7980 + stub_entry->target_section->output_offset
7981 + stub_entry->target_section->output_section->vma);
7982
7983 /* And this is where we are coming from. */
7984 off -= (stub_entry->stub_offset
7985 + stub_entry->stub_sec->output_offset
7986 + stub_entry->stub_sec->output_section->vma);
7987
7988 if (stub_entry->stub_type != ppc_stub_long_branch_r2off)
7989 size = 4;
7990 else
7991 {
7992 bfd_vma r2off;
7993
7994 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off
7995 - htab->stub_group[stub_entry->id_sec->id].toc_off);
7996 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
7997 loc += 4;
7998 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc);
7999 loc += 4;
8000 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc);
8001 loc += 4;
8002 off -= 12;
8003 size = 16;
8004 }
8005 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc);
8006
8007 BFD_ASSERT (off + (1 << 25) < (bfd_vma) (1 << 26));
8008
8009 if (info->emitrelocations)
8010 {
8011 Elf_Internal_Rela *relocs, *r;
8012 struct bfd_elf_section_data *elfsec_data;
8013
8014 elfsec_data = elf_section_data (stub_entry->stub_sec);
8015 relocs = elfsec_data->relocs;
8016 if (relocs == NULL)
8017 {
8018 bfd_size_type relsize;
8019 relsize = stub_entry->stub_sec->reloc_count * sizeof (*relocs);
8020 relocs = bfd_alloc (htab->stub_bfd, relsize);
8021 if (relocs == NULL)
8022 return FALSE;
8023 elfsec_data->relocs = relocs;
8024 elfsec_data->rel_hdr.sh_size = relsize;
8025 elfsec_data->rel_hdr.sh_entsize = 24;
8026 stub_entry->stub_sec->reloc_count = 0;
8027 }
8028 r = relocs + stub_entry->stub_sec->reloc_count;
8029 stub_entry->stub_sec->reloc_count += 1;
8030 r->r_offset = loc - stub_entry->stub_sec->contents;
8031 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24);
8032 r->r_addend = dest;
8033 if (stub_entry->h != NULL)
8034 {
8035 struct elf_link_hash_entry **hashes;
8036 unsigned long symndx;
8037 struct ppc_link_hash_entry *h;
8038
8039 hashes = elf_sym_hashes (htab->stub_bfd);
8040 if (hashes == NULL)
8041 {
8042 bfd_size_type hsize;
8043
8044 hsize = (htab->stub_globals + 1) * sizeof (*hashes);
8045 hashes = bfd_zalloc (htab->stub_bfd, hsize);
8046 if (hashes == NULL)
8047 return FALSE;
8048 elf_sym_hashes (htab->stub_bfd) = hashes;
8049 htab->stub_globals = 1;
8050 }
8051 symndx = htab->stub_globals++;
8052 h = stub_entry->h;
8053 hashes[symndx] = &h->elf;
8054 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24);
8055 if (h->oh != NULL && h->oh->is_func)
8056 h = h->oh;
8057 if (h->elf.root.u.def.section != stub_entry->target_section)
8058 /* H is an opd symbol. The addend must be zero. */
8059 r->r_addend = 0;
8060 else
8061 {
8062 off = (h->elf.root.u.def.value
8063 + h->elf.root.u.def.section->output_offset
8064 + h->elf.root.u.def.section->output_section->vma);
8065 r->r_addend -= off;
8066 }
8067 }
8068 }
8069 break;
8070
8071 case ppc_stub_plt_branch:
8072 case ppc_stub_plt_branch_r2off:
8073 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
8074 stub_entry->root.string + 9,
8075 FALSE, FALSE);
8076 if (br_entry == NULL)
8077 {
8078 (*_bfd_error_handler) (_("can't find branch stub `%s'"),
8079 stub_entry->root.string + 9);
8080 htab->stub_error = TRUE;
8081 return FALSE;
8082 }
8083
8084 off = (stub_entry->target_value
8085 + stub_entry->target_section->output_offset
8086 + stub_entry->target_section->output_section->vma);
8087
8088 bfd_put_64 (htab->brlt->owner, off,
8089 htab->brlt->contents + br_entry->offset);
8090
8091 if (htab->relbrlt != NULL)
8092 {
8093 /* Create a reloc for the branch lookup table entry. */
8094 Elf_Internal_Rela rela;
8095 bfd_byte *rl;
8096
8097 rela.r_offset = (br_entry->offset
8098 + htab->brlt->output_offset
8099 + htab->brlt->output_section->vma);
8100 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
8101 rela.r_addend = off;
8102
8103 rl = htab->relbrlt->contents;
8104 rl += htab->relbrlt->reloc_count++ * sizeof (Elf64_External_Rela);
8105 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl);
8106 }
8107
8108 off = (br_entry->offset
8109 + htab->brlt->output_offset
8110 + htab->brlt->output_section->vma
8111 - elf_gp (htab->brlt->output_section->owner)
8112 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8113
8114 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
8115 {
8116 (*_bfd_error_handler)
8117 (_("linkage table error against `%s'"),
8118 stub_entry->root.string);
8119 bfd_set_error (bfd_error_bad_value);
8120 htab->stub_error = TRUE;
8121 return FALSE;
8122 }
8123
8124 indx = off;
8125 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off)
8126 {
8127 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc);
8128 loc += 4;
8129 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc);
8130 size = 16;
8131 }
8132 else
8133 {
8134 bfd_vma r2off;
8135
8136 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off
8137 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8138 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
8139 loc += 4;
8140 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc);
8141 loc += 4;
8142 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc);
8143 loc += 4;
8144 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc);
8145 loc += 4;
8146 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc);
8147 size = 28;
8148 }
8149 loc += 4;
8150 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc);
8151 loc += 4;
8152 bfd_put_32 (htab->stub_bfd, BCTR, loc);
8153 break;
8154
8155 case ppc_stub_plt_call:
8156 /* Do the best we can for shared libraries built without
8157 exporting ".foo" for each "foo". This can happen when symbol
8158 versioning scripts strip all bar a subset of symbols. */
8159 if (stub_entry->h->oh != NULL
8160 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defined
8161 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defweak)
8162 {
8163 /* Point the symbol at the stub. There may be multiple stubs,
8164 we don't really care; The main thing is to make this sym
8165 defined somewhere. Maybe defining the symbol in the stub
8166 section is a silly idea. If we didn't do this, htab->top_id
8167 could disappear. */
8168 stub_entry->h->oh->elf.root.type = bfd_link_hash_defined;
8169 stub_entry->h->oh->elf.root.u.def.section = stub_entry->stub_sec;
8170 stub_entry->h->oh->elf.root.u.def.value = stub_entry->stub_offset;
8171 }
8172
8173 /* Now build the stub. */
8174 off = (bfd_vma) -1;
8175 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next)
8176 if (ent->addend == stub_entry->addend)
8177 {
8178 off = ent->plt.offset;
8179 break;
8180 }
8181 if (off >= (bfd_vma) -2)
8182 abort ();
8183
8184 off &= ~ (bfd_vma) 1;
8185 off += (htab->plt->output_offset
8186 + htab->plt->output_section->vma
8187 - elf_gp (htab->plt->output_section->owner)
8188 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8189
8190 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
8191 {
8192 (*_bfd_error_handler)
8193 (_("linkage table error against `%s'"),
8194 stub_entry->h->elf.root.root.string);
8195 bfd_set_error (bfd_error_bad_value);
8196 htab->stub_error = TRUE;
8197 return FALSE;
8198 }
8199
8200 p = build_plt_stub (htab->stub_bfd, loc, off);
8201 size = p - loc;
8202 break;
8203
8204 default:
8205 BFD_FAIL ();
8206 return FALSE;
8207 }
8208
8209 stub_entry->stub_sec->size += size;
8210
8211 if (htab->emit_stub_syms)
8212 {
8213 struct elf_link_hash_entry *h;
8214 size_t len1, len2;
8215 char *name;
8216 const char *const stub_str[] = { "long_branch",
8217 "long_branch_r2off",
8218 "plt_branch",
8219 "plt_branch_r2off",
8220 "plt_call" };
8221
8222 len1 = strlen (stub_str[stub_entry->stub_type - 1]);
8223 len2 = strlen (stub_entry->root.string);
8224 name = bfd_malloc (len1 + len2 + 2);
8225 if (name == NULL)
8226 return FALSE;
8227 memcpy (name, stub_entry->root.string, 9);
8228 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1);
8229 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1);
8230 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE);
8231 if (h == NULL)
8232 return FALSE;
8233 if (h->root.type == bfd_link_hash_new)
8234 {
8235 h->root.type = bfd_link_hash_defined;
8236 h->root.u.def.section = stub_entry->stub_sec;
8237 h->root.u.def.value = stub_entry->stub_offset;
8238 h->ref_regular = 1;
8239 h->def_regular = 1;
8240 h->ref_regular_nonweak = 1;
8241 h->forced_local = 1;
8242 h->non_elf = 0;
8243 }
8244 }
8245
8246 return TRUE;
8247 }
8248
8249 /* As above, but don't actually build the stub. Just bump offset so
8250 we know stub section sizes, and select plt_branch stubs where
8251 long_branch stubs won't do. */
8252
8253 static bfd_boolean
ppc_size_one_stub(struct bfd_hash_entry * gen_entry,void * in_arg)8254 ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
8255 {
8256 struct ppc_stub_hash_entry *stub_entry;
8257 struct bfd_link_info *info;
8258 struct ppc_link_hash_table *htab;
8259 bfd_vma off;
8260 int size;
8261
8262 /* Massage our args to the form they really have. */
8263 stub_entry = (struct ppc_stub_hash_entry *) gen_entry;
8264 info = in_arg;
8265
8266 htab = ppc_hash_table (info);
8267
8268 if (stub_entry->stub_type == ppc_stub_plt_call)
8269 {
8270 struct plt_entry *ent;
8271 off = (bfd_vma) -1;
8272 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next)
8273 if (ent->addend == stub_entry->addend)
8274 {
8275 off = ent->plt.offset & ~(bfd_vma) 1;
8276 break;
8277 }
8278 if (off >= (bfd_vma) -2)
8279 abort ();
8280 off += (htab->plt->output_offset
8281 + htab->plt->output_section->vma
8282 - elf_gp (htab->plt->output_section->owner)
8283 - htab->stub_group[stub_entry->id_sec->id].toc_off);
8284
8285 size = PLT_CALL_STUB_SIZE;
8286 if (PPC_HA (off + 16) != PPC_HA (off))
8287 size += 4;
8288 }
8289 else
8290 {
8291 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off
8292 variants. */
8293 off = (stub_entry->target_value
8294 + stub_entry->target_section->output_offset
8295 + stub_entry->target_section->output_section->vma);
8296 off -= (stub_entry->stub_sec->size
8297 + stub_entry->stub_sec->output_offset
8298 + stub_entry->stub_sec->output_section->vma);
8299
8300 /* Reset the stub type from the plt variant in case we now
8301 can reach with a shorter stub. */
8302 if (stub_entry->stub_type >= ppc_stub_plt_branch)
8303 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch;
8304
8305 size = 4;
8306 if (stub_entry->stub_type == ppc_stub_long_branch_r2off)
8307 {
8308 off -= 12;
8309 size = 16;
8310 }
8311
8312 /* If the branch offset if too big, use a ppc_stub_plt_branch. */
8313 if (off + (1 << 25) >= (bfd_vma) (1 << 26))
8314 {
8315 struct ppc_branch_hash_entry *br_entry;
8316
8317 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table,
8318 stub_entry->root.string + 9,
8319 TRUE, FALSE);
8320 if (br_entry == NULL)
8321 {
8322 (*_bfd_error_handler) (_("can't build branch stub `%s'"),
8323 stub_entry->root.string + 9);
8324 htab->stub_error = TRUE;
8325 return FALSE;
8326 }
8327
8328 if (br_entry->iter != htab->stub_iteration)
8329 {
8330 br_entry->iter = htab->stub_iteration;
8331 br_entry->offset = htab->brlt->size;
8332 htab->brlt->size += 8;
8333
8334 if (htab->relbrlt != NULL)
8335 htab->relbrlt->size += sizeof (Elf64_External_Rela);
8336 }
8337
8338 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch;
8339 size = 16;
8340 if (stub_entry->stub_type != ppc_stub_plt_branch)
8341 size = 28;
8342 }
8343
8344 if (info->emitrelocations
8345 && (stub_entry->stub_type == ppc_stub_long_branch
8346 || stub_entry->stub_type == ppc_stub_long_branch_r2off))
8347 stub_entry->stub_sec->reloc_count += 1;
8348 }
8349
8350 stub_entry->stub_sec->size += size;
8351 return TRUE;
8352 }
8353
8354 /* Set up various things so that we can make a list of input sections
8355 for each output section included in the link. Returns -1 on error,
8356 0 when no stubs will be needed, and 1 on success. */
8357
8358 int
ppc64_elf_setup_section_lists(bfd * output_bfd,struct bfd_link_info * info,int no_multi_toc)8359 ppc64_elf_setup_section_lists (bfd *output_bfd,
8360 struct bfd_link_info *info,
8361 int no_multi_toc)
8362 {
8363 bfd *input_bfd;
8364 int top_id, top_index, id;
8365 asection *section;
8366 asection **input_list;
8367 bfd_size_type amt;
8368 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8369
8370 htab->no_multi_toc = no_multi_toc;
8371
8372 if (htab->brlt == NULL)
8373 return 0;
8374
8375 /* Find the top input section id. */
8376 for (input_bfd = info->input_bfds, top_id = 3;
8377 input_bfd != NULL;
8378 input_bfd = input_bfd->link_next)
8379 {
8380 for (section = input_bfd->sections;
8381 section != NULL;
8382 section = section->next)
8383 {
8384 if (top_id < section->id)
8385 top_id = section->id;
8386 }
8387 }
8388
8389 htab->top_id = top_id;
8390 amt = sizeof (struct map_stub) * (top_id + 1);
8391 htab->stub_group = bfd_zmalloc (amt);
8392 if (htab->stub_group == NULL)
8393 return -1;
8394
8395 /* Set toc_off for com, und, abs and ind sections. */
8396 for (id = 0; id < 3; id++)
8397 htab->stub_group[id].toc_off = TOC_BASE_OFF;
8398
8399 elf_gp (output_bfd) = htab->toc_curr = ppc64_elf_toc (output_bfd);
8400
8401 /* We can't use output_bfd->section_count here to find the top output
8402 section index as some sections may have been removed, and
8403 strip_excluded_output_sections doesn't renumber the indices. */
8404 for (section = output_bfd->sections, top_index = 0;
8405 section != NULL;
8406 section = section->next)
8407 {
8408 if (top_index < section->index)
8409 top_index = section->index;
8410 }
8411
8412 htab->top_index = top_index;
8413 amt = sizeof (asection *) * (top_index + 1);
8414 input_list = bfd_zmalloc (amt);
8415 htab->input_list = input_list;
8416 if (input_list == NULL)
8417 return -1;
8418
8419 return 1;
8420 }
8421
8422 /* The linker repeatedly calls this function for each TOC input section
8423 and linker generated GOT section. Group input bfds such that the toc
8424 within a group is less than 64k in size. Will break with cute linker
8425 scripts that play games with dot in the output toc section. */
8426
8427 void
ppc64_elf_next_toc_section(struct bfd_link_info * info,asection * isec)8428 ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec)
8429 {
8430 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8431
8432 if (!htab->no_multi_toc)
8433 {
8434 bfd_vma addr = isec->output_offset + isec->output_section->vma;
8435 bfd_vma off = addr - htab->toc_curr;
8436
8437 if (off + isec->size > 0x10000)
8438 htab->toc_curr = addr;
8439
8440 elf_gp (isec->owner) = (htab->toc_curr
8441 - elf_gp (isec->output_section->owner)
8442 + TOC_BASE_OFF);
8443 }
8444 }
8445
8446 /* Called after the last call to the above function. */
8447
8448 void
ppc64_elf_reinit_toc(bfd * output_bfd,struct bfd_link_info * info)8449 ppc64_elf_reinit_toc (bfd *output_bfd, struct bfd_link_info *info)
8450 {
8451 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8452
8453 htab->multi_toc_needed = htab->toc_curr != elf_gp (output_bfd);
8454
8455 /* toc_curr tracks the TOC offset used for code sections below in
8456 ppc64_elf_next_input_section. Start off at 0x8000. */
8457 htab->toc_curr = TOC_BASE_OFF;
8458 }
8459
8460 /* No toc references were found in ISEC. If the code in ISEC makes no
8461 calls, then there's no need to use toc adjusting stubs when branching
8462 into ISEC. Actually, indirect calls from ISEC are OK as they will
8463 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub
8464 needed, and 2 if a cyclical call-graph was found but no other reason
8465 for a stub was detected. If called from the top level, a return of
8466 2 means the same as a return of 0. */
8467
8468 static int
toc_adjusting_stub_needed(struct bfd_link_info * info,asection * isec)8469 toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec)
8470 {
8471 Elf_Internal_Rela *relstart, *rel;
8472 Elf_Internal_Sym *local_syms;
8473 int ret;
8474 struct ppc_link_hash_table *htab;
8475
8476 /* We know none of our code bearing sections will need toc stubs. */
8477 if ((isec->flags & SEC_LINKER_CREATED) != 0)
8478 return 0;
8479
8480 if (isec->size == 0)
8481 return 0;
8482
8483 if (isec->output_section == NULL)
8484 return 0;
8485
8486 /* Hack for linux kernel. .fixup contains branches, but only back to
8487 the function that hit an exception. */
8488 if (strcmp (isec->name, ".fixup") == 0)
8489 return 0;
8490
8491 if (isec->reloc_count == 0)
8492 return 0;
8493
8494 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL,
8495 info->keep_memory);
8496 if (relstart == NULL)
8497 return -1;
8498
8499 /* Look for branches to outside of this section. */
8500 local_syms = NULL;
8501 ret = 0;
8502 htab = ppc_hash_table (info);
8503 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel)
8504 {
8505 enum elf_ppc64_reloc_type r_type;
8506 unsigned long r_symndx;
8507 struct elf_link_hash_entry *h;
8508 Elf_Internal_Sym *sym;
8509 asection *sym_sec;
8510 long *opd_adjust;
8511 bfd_vma sym_value;
8512 bfd_vma dest;
8513
8514 r_type = ELF64_R_TYPE (rel->r_info);
8515 if (r_type != R_PPC64_REL24
8516 && r_type != R_PPC64_REL14
8517 && r_type != R_PPC64_REL14_BRTAKEN
8518 && r_type != R_PPC64_REL14_BRNTAKEN)
8519 continue;
8520
8521 r_symndx = ELF64_R_SYM (rel->r_info);
8522 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx,
8523 isec->owner))
8524 {
8525 ret = -1;
8526 break;
8527 }
8528
8529 /* Calls to dynamic lib functions go through a plt call stub
8530 that uses r2. Branches to undefined symbols might be a call
8531 using old-style dot symbols that can be satisfied by a plt
8532 call into a new-style dynamic library. */
8533 if (sym_sec == NULL)
8534 {
8535 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h;
8536 if (eh != NULL
8537 && eh->oh != NULL
8538 && eh->oh->elf.plt.plist != NULL)
8539 {
8540 ret = 1;
8541 break;
8542 }
8543
8544 /* Ignore other undefined symbols. */
8545 continue;
8546 }
8547
8548 /* Assume branches to other sections not included in the link need
8549 stubs too, to cover -R and absolute syms. */
8550 if (sym_sec->output_section == NULL)
8551 {
8552 ret = 1;
8553 break;
8554 }
8555
8556 if (h == NULL)
8557 sym_value = sym->st_value;
8558 else
8559 {
8560 if (h->root.type != bfd_link_hash_defined
8561 && h->root.type != bfd_link_hash_defweak)
8562 abort ();
8563 sym_value = h->root.u.def.value;
8564 }
8565 sym_value += rel->r_addend;
8566
8567 /* If this branch reloc uses an opd sym, find the code section. */
8568 opd_adjust = get_opd_info (sym_sec);
8569 if (opd_adjust != NULL)
8570 {
8571 if (h == NULL)
8572 {
8573 long adjust;
8574
8575 adjust = opd_adjust[sym->st_value / 8];
8576 if (adjust == -1)
8577 /* Assume deleted functions won't ever be called. */
8578 continue;
8579 sym_value += adjust;
8580 }
8581
8582 dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL);
8583 if (dest == (bfd_vma) -1)
8584 continue;
8585 }
8586 else
8587 dest = (sym_value
8588 + sym_sec->output_offset
8589 + sym_sec->output_section->vma);
8590
8591 /* Ignore branch to self. */
8592 if (sym_sec == isec)
8593 continue;
8594
8595 /* If the called function uses the toc, we need a stub. */
8596 if (sym_sec->has_toc_reloc
8597 || sym_sec->makes_toc_func_call)
8598 {
8599 ret = 1;
8600 break;
8601 }
8602
8603 /* Assume any branch that needs a long branch stub might in fact
8604 need a plt_branch stub. A plt_branch stub uses r2. */
8605 else if (dest - (isec->output_offset
8606 + isec->output_section->vma
8607 + rel->r_offset) + (1 << 25) >= (2 << 25))
8608 {
8609 ret = 1;
8610 break;
8611 }
8612
8613 /* If calling back to a section in the process of being tested, we
8614 can't say for sure that no toc adjusting stubs are needed, so
8615 don't return zero. */
8616 else if (sym_sec->call_check_in_progress)
8617 ret = 2;
8618
8619 /* Branches to another section that itself doesn't have any TOC
8620 references are OK. Recursively call ourselves to check. */
8621 else if (sym_sec->id <= htab->top_id
8622 && htab->stub_group[sym_sec->id].toc_off == 0)
8623 {
8624 int recur;
8625
8626 /* Mark current section as indeterminate, so that other
8627 sections that call back to current won't be marked as
8628 known. */
8629 isec->call_check_in_progress = 1;
8630 recur = toc_adjusting_stub_needed (info, sym_sec);
8631 isec->call_check_in_progress = 0;
8632
8633 if (recur < 0)
8634 {
8635 /* An error. Exit. */
8636 ret = -1;
8637 break;
8638 }
8639 else if (recur <= 1)
8640 {
8641 /* Known result. Mark as checked and set section flag. */
8642 htab->stub_group[sym_sec->id].toc_off = 1;
8643 if (recur != 0)
8644 {
8645 sym_sec->makes_toc_func_call = 1;
8646 ret = 1;
8647 break;
8648 }
8649 }
8650 else
8651 {
8652 /* Unknown result. Continue checking. */
8653 ret = 2;
8654 }
8655 }
8656 }
8657
8658 if (local_syms != NULL
8659 && (elf_tdata (isec->owner)->symtab_hdr.contents
8660 != (unsigned char *) local_syms))
8661 free (local_syms);
8662 if (elf_section_data (isec)->relocs != relstart)
8663 free (relstart);
8664
8665 return ret;
8666 }
8667
8668 /* The linker repeatedly calls this function for each input section,
8669 in the order that input sections are linked into output sections.
8670 Build lists of input sections to determine groupings between which
8671 we may insert linker stubs. */
8672
8673 bfd_boolean
ppc64_elf_next_input_section(struct bfd_link_info * info,asection * isec)8674 ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec)
8675 {
8676 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8677
8678 if ((isec->output_section->flags & SEC_CODE) != 0
8679 && isec->output_section->index <= htab->top_index)
8680 {
8681 asection **list = htab->input_list + isec->output_section->index;
8682 /* Steal the link_sec pointer for our list. */
8683 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec)
8684 /* This happens to make the list in reverse order,
8685 which is what we want. */
8686 PREV_SEC (isec) = *list;
8687 *list = isec;
8688 }
8689
8690 if (htab->multi_toc_needed)
8691 {
8692 /* If a code section has a function that uses the TOC then we need
8693 to use the right TOC (obviously). Also, make sure that .opd gets
8694 the correct TOC value for R_PPC64_TOC relocs that don't have or
8695 can't find their function symbol (shouldn't ever happen now). */
8696 if (isec->has_toc_reloc || (isec->flags & SEC_CODE) == 0)
8697 {
8698 if (elf_gp (isec->owner) != 0)
8699 htab->toc_curr = elf_gp (isec->owner);
8700 }
8701 else if (htab->stub_group[isec->id].toc_off == 0)
8702 {
8703 int ret = toc_adjusting_stub_needed (info, isec);
8704 if (ret < 0)
8705 return FALSE;
8706 else
8707 isec->makes_toc_func_call = ret & 1;
8708 }
8709 }
8710
8711 /* Functions that don't use the TOC can belong in any TOC group.
8712 Use the last TOC base. This happens to make _init and _fini
8713 pasting work. */
8714 htab->stub_group[isec->id].toc_off = htab->toc_curr;
8715 return TRUE;
8716 }
8717
8718 /* See whether we can group stub sections together. Grouping stub
8719 sections may result in fewer stubs. More importantly, we need to
8720 put all .init* and .fini* stubs at the beginning of the .init or
8721 .fini output sections respectively, because glibc splits the
8722 _init and _fini functions into multiple parts. Putting a stub in
8723 the middle of a function is not a good idea. */
8724
8725 static void
group_sections(struct ppc_link_hash_table * htab,bfd_size_type stub_group_size,bfd_boolean stubs_always_before_branch)8726 group_sections (struct ppc_link_hash_table *htab,
8727 bfd_size_type stub_group_size,
8728 bfd_boolean stubs_always_before_branch)
8729 {
8730 asection **list = htab->input_list + htab->top_index;
8731 do
8732 {
8733 asection *tail = *list;
8734 while (tail != NULL)
8735 {
8736 asection *curr;
8737 asection *prev;
8738 bfd_size_type total;
8739 bfd_boolean big_sec;
8740 bfd_vma curr_toc;
8741
8742 curr = tail;
8743 total = tail->size;
8744 big_sec = total >= stub_group_size;
8745 curr_toc = htab->stub_group[tail->id].toc_off;
8746
8747 while ((prev = PREV_SEC (curr)) != NULL
8748 && ((total += curr->output_offset - prev->output_offset)
8749 < stub_group_size)
8750 && htab->stub_group[prev->id].toc_off == curr_toc)
8751 curr = prev;
8752
8753 /* OK, the size from the start of CURR to the end is less
8754 than stub_group_size and thus can be handled by one stub
8755 section. (or the tail section is itself larger than
8756 stub_group_size, in which case we may be toast.) We
8757 should really be keeping track of the total size of stubs
8758 added here, as stubs contribute to the final output
8759 section size. That's a little tricky, and this way will
8760 only break if stubs added make the total size more than
8761 2^25, ie. for the default stub_group_size, if stubs total
8762 more than 2097152 bytes, or nearly 75000 plt call stubs. */
8763 do
8764 {
8765 prev = PREV_SEC (tail);
8766 /* Set up this stub group. */
8767 htab->stub_group[tail->id].link_sec = curr;
8768 }
8769 while (tail != curr && (tail = prev) != NULL);
8770
8771 /* But wait, there's more! Input sections up to stub_group_size
8772 bytes before the stub section can be handled by it too.
8773 Don't do this if we have a really large section after the
8774 stubs, as adding more stubs increases the chance that
8775 branches may not reach into the stub section. */
8776 if (!stubs_always_before_branch && !big_sec)
8777 {
8778 total = 0;
8779 while (prev != NULL
8780 && ((total += tail->output_offset - prev->output_offset)
8781 < stub_group_size)
8782 && htab->stub_group[prev->id].toc_off == curr_toc)
8783 {
8784 tail = prev;
8785 prev = PREV_SEC (tail);
8786 htab->stub_group[tail->id].link_sec = curr;
8787 }
8788 }
8789 tail = prev;
8790 }
8791 }
8792 while (list-- != htab->input_list);
8793 free (htab->input_list);
8794 #undef PREV_SEC
8795 }
8796
8797 /* Determine and set the size of the stub section for a final link.
8798
8799 The basic idea here is to examine all the relocations looking for
8800 PC-relative calls to a target that is unreachable with a "bl"
8801 instruction. */
8802
8803 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))8804 ppc64_elf_size_stubs (bfd *output_bfd,
8805 struct bfd_link_info *info,
8806 bfd_signed_vma group_size,
8807 asection *(*add_stub_section) (const char *, asection *),
8808 void (*layout_sections_again) (void))
8809 {
8810 bfd_size_type stub_group_size;
8811 bfd_boolean stubs_always_before_branch;
8812 struct ppc_link_hash_table *htab = ppc_hash_table (info);
8813
8814 /* Stash our params away. */
8815 htab->add_stub_section = add_stub_section;
8816 htab->layout_sections_again = layout_sections_again;
8817 stubs_always_before_branch = group_size < 0;
8818 if (group_size < 0)
8819 stub_group_size = -group_size;
8820 else
8821 stub_group_size = group_size;
8822 if (stub_group_size == 1)
8823 {
8824 /* Default values. */
8825 if (stubs_always_before_branch)
8826 {
8827 stub_group_size = 0x1e00000;
8828 if (htab->has_14bit_branch)
8829 stub_group_size = 0x7800;
8830 }
8831 else
8832 {
8833 stub_group_size = 0x1c00000;
8834 if (htab->has_14bit_branch)
8835 stub_group_size = 0x7000;
8836 }
8837 }
8838
8839 group_sections (htab, stub_group_size, stubs_always_before_branch);
8840
8841 while (1)
8842 {
8843 bfd *input_bfd;
8844 unsigned int bfd_indx;
8845 asection *stub_sec;
8846 bfd_boolean stub_changed;
8847
8848 htab->stub_iteration += 1;
8849 stub_changed = FALSE;
8850
8851 for (input_bfd = info->input_bfds, bfd_indx = 0;
8852 input_bfd != NULL;
8853 input_bfd = input_bfd->link_next, bfd_indx++)
8854 {
8855 Elf_Internal_Shdr *symtab_hdr;
8856 asection *section;
8857 Elf_Internal_Sym *local_syms = NULL;
8858
8859 /* We'll need the symbol table in a second. */
8860 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
8861 if (symtab_hdr->sh_info == 0)
8862 continue;
8863
8864 /* Walk over each section attached to the input bfd. */
8865 for (section = input_bfd->sections;
8866 section != NULL;
8867 section = section->next)
8868 {
8869 Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
8870
8871 /* If there aren't any relocs, then there's nothing more
8872 to do. */
8873 if ((section->flags & SEC_RELOC) == 0
8874 || section->reloc_count == 0)
8875 continue;
8876
8877 /* If this section is a link-once section that will be
8878 discarded, then don't create any stubs. */
8879 if (section->output_section == NULL
8880 || section->output_section->owner != output_bfd)
8881 continue;
8882
8883 /* Get the relocs. */
8884 internal_relocs
8885 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
8886 info->keep_memory);
8887 if (internal_relocs == NULL)
8888 goto error_ret_free_local;
8889
8890 /* Now examine each relocation. */
8891 irela = internal_relocs;
8892 irelaend = irela + section->reloc_count;
8893 for (; irela < irelaend; irela++)
8894 {
8895 enum elf_ppc64_reloc_type r_type;
8896 unsigned int r_indx;
8897 enum ppc_stub_type stub_type;
8898 struct ppc_stub_hash_entry *stub_entry;
8899 asection *sym_sec, *code_sec;
8900 bfd_vma sym_value;
8901 bfd_vma destination;
8902 bfd_boolean ok_dest;
8903 struct ppc_link_hash_entry *hash;
8904 struct ppc_link_hash_entry *fdh;
8905 struct elf_link_hash_entry *h;
8906 Elf_Internal_Sym *sym;
8907 char *stub_name;
8908 const asection *id_sec;
8909 long *opd_adjust;
8910
8911 r_type = ELF64_R_TYPE (irela->r_info);
8912 r_indx = ELF64_R_SYM (irela->r_info);
8913
8914 if (r_type >= R_PPC64_max)
8915 {
8916 bfd_set_error (bfd_error_bad_value);
8917 goto error_ret_free_internal;
8918 }
8919
8920 /* Only look for stubs on branch instructions. */
8921 if (r_type != R_PPC64_REL24
8922 && r_type != R_PPC64_REL14
8923 && r_type != R_PPC64_REL14_BRTAKEN
8924 && r_type != R_PPC64_REL14_BRNTAKEN)
8925 continue;
8926
8927 /* Now determine the call target, its name, value,
8928 section. */
8929 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms,
8930 r_indx, input_bfd))
8931 goto error_ret_free_internal;
8932 hash = (struct ppc_link_hash_entry *) h;
8933
8934 ok_dest = FALSE;
8935 fdh = NULL;
8936 if (hash == NULL)
8937 {
8938 sym_value = sym->st_value;
8939 ok_dest = TRUE;
8940 }
8941 else
8942 {
8943 sym_value = 0;
8944 /* Recognise an old ABI func code entry sym, and
8945 use the func descriptor sym instead. */
8946 if (hash->elf.root.root.string[0] == '.'
8947 && (fdh = get_fdh (hash, htab)) != NULL)
8948 {
8949 if (fdh->elf.root.type == bfd_link_hash_defined
8950 || fdh->elf.root.type == bfd_link_hash_defweak)
8951 {
8952 sym_sec = fdh->elf.root.u.def.section;
8953 sym_value = fdh->elf.root.u.def.value;
8954 if (sym_sec->output_section != NULL)
8955 ok_dest = TRUE;
8956 }
8957 else
8958 fdh = NULL;
8959 }
8960 else if (hash->elf.root.type == bfd_link_hash_defined
8961 || hash->elf.root.type == bfd_link_hash_defweak)
8962 {
8963 sym_value = hash->elf.root.u.def.value;
8964 if (sym_sec->output_section != NULL)
8965 ok_dest = TRUE;
8966 }
8967 else if (hash->elf.root.type == bfd_link_hash_undefweak)
8968 ;
8969 else if (hash->elf.root.type == bfd_link_hash_undefined)
8970 ;
8971 else
8972 {
8973 bfd_set_error (bfd_error_bad_value);
8974 goto error_ret_free_internal;
8975 }
8976 }
8977
8978 destination = 0;
8979 if (ok_dest)
8980 {
8981 sym_value += irela->r_addend;
8982 destination = (sym_value
8983 + sym_sec->output_offset
8984 + sym_sec->output_section->vma);
8985 }
8986
8987 code_sec = sym_sec;
8988 opd_adjust = get_opd_info (sym_sec);
8989 if (opd_adjust != NULL)
8990 {
8991 bfd_vma dest;
8992
8993 if (hash == NULL)
8994 {
8995 long adjust = opd_adjust[sym_value / 8];
8996 if (adjust == -1)
8997 continue;
8998 sym_value += adjust;
8999 }
9000 dest = opd_entry_value (sym_sec, sym_value,
9001 &code_sec, &sym_value);
9002 if (dest != (bfd_vma) -1)
9003 {
9004 destination = dest;
9005 if (fdh != NULL)
9006 {
9007 /* Fixup old ABI sym to point at code
9008 entry. */
9009 hash->elf.root.type = bfd_link_hash_defweak;
9010 hash->elf.root.u.def.section = code_sec;
9011 hash->elf.root.u.def.value = sym_value;
9012 }
9013 }
9014 }
9015
9016 /* Determine what (if any) linker stub is needed. */
9017 stub_type = ppc_type_of_stub (section, irela, &hash,
9018 destination);
9019
9020 if (stub_type != ppc_stub_plt_call)
9021 {
9022 /* Check whether we need a TOC adjusting stub.
9023 Since the linker pastes together pieces from
9024 different object files when creating the
9025 _init and _fini functions, it may be that a
9026 call to what looks like a local sym is in
9027 fact a call needing a TOC adjustment. */
9028 if (code_sec != NULL
9029 && code_sec->output_section != NULL
9030 && (htab->stub_group[code_sec->id].toc_off
9031 != htab->stub_group[section->id].toc_off)
9032 && (code_sec->has_toc_reloc
9033 || code_sec->makes_toc_func_call))
9034 stub_type = ppc_stub_long_branch_r2off;
9035 }
9036
9037 if (stub_type == ppc_stub_none)
9038 continue;
9039
9040 /* __tls_get_addr calls might be eliminated. */
9041 if (stub_type != ppc_stub_plt_call
9042 && hash != NULL
9043 && (hash == htab->tls_get_addr
9044 || hash == htab->tls_get_addr_fd)
9045 && section->has_tls_reloc
9046 && irela != internal_relocs)
9047 {
9048 /* Get tls info. */
9049 char *tls_mask;
9050
9051 if (!get_tls_mask (&tls_mask, NULL, &local_syms,
9052 irela - 1, input_bfd))
9053 goto error_ret_free_internal;
9054 if (*tls_mask != 0)
9055 continue;
9056 }
9057
9058 /* Support for grouping stub sections. */
9059 id_sec = htab->stub_group[section->id].link_sec;
9060
9061 /* Get the name of this stub. */
9062 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela);
9063 if (!stub_name)
9064 goto error_ret_free_internal;
9065
9066 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table,
9067 stub_name, FALSE, FALSE);
9068 if (stub_entry != NULL)
9069 {
9070 /* The proper stub has already been created. */
9071 free (stub_name);
9072 continue;
9073 }
9074
9075 stub_entry = ppc_add_stub (stub_name, section, htab);
9076 if (stub_entry == NULL)
9077 {
9078 free (stub_name);
9079 error_ret_free_internal:
9080 if (elf_section_data (section)->relocs == NULL)
9081 free (internal_relocs);
9082 error_ret_free_local:
9083 if (local_syms != NULL
9084 && (symtab_hdr->contents
9085 != (unsigned char *) local_syms))
9086 free (local_syms);
9087 return FALSE;
9088 }
9089
9090 stub_entry->stub_type = stub_type;
9091 stub_entry->target_value = sym_value;
9092 stub_entry->target_section = code_sec;
9093 stub_entry->h = hash;
9094 stub_entry->addend = irela->r_addend;
9095
9096 if (stub_entry->h != NULL)
9097 htab->stub_globals += 1;
9098
9099 stub_changed = TRUE;
9100 }
9101
9102 /* We're done with the internal relocs, free them. */
9103 if (elf_section_data (section)->relocs != internal_relocs)
9104 free (internal_relocs);
9105 }
9106
9107 if (local_syms != NULL
9108 && symtab_hdr->contents != (unsigned char *) local_syms)
9109 {
9110 if (!info->keep_memory)
9111 free (local_syms);
9112 else
9113 symtab_hdr->contents = (unsigned char *) local_syms;
9114 }
9115 }
9116
9117 if (!stub_changed)
9118 break;
9119
9120 /* OK, we've added some stubs. Find out the new size of the
9121 stub sections. */
9122 for (stub_sec = htab->stub_bfd->sections;
9123 stub_sec != NULL;
9124 stub_sec = stub_sec->next)
9125 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
9126 {
9127 stub_sec->size = 0;
9128 stub_sec->reloc_count = 0;
9129 }
9130
9131 htab->brlt->size = 0;
9132 if (htab->relbrlt != NULL)
9133 htab->relbrlt->size = 0;
9134
9135 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info);
9136
9137 /* Ask the linker to do its stuff. */
9138 (*htab->layout_sections_again) ();
9139 }
9140
9141 /* It would be nice to strip .branch_lt from the output if the
9142 section is empty, but it's too late. If we strip sections here,
9143 the dynamic symbol table is corrupted since the section symbol
9144 for the stripped section isn't written. */
9145
9146 return TRUE;
9147 }
9148
9149 /* Called after we have determined section placement. If sections
9150 move, we'll be called again. Provide a value for TOCstart. */
9151
9152 bfd_vma
ppc64_elf_toc(bfd * obfd)9153 ppc64_elf_toc (bfd *obfd)
9154 {
9155 asection *s;
9156 bfd_vma TOCstart;
9157
9158 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that
9159 order. The TOC starts where the first of these sections starts. */
9160 s = bfd_get_section_by_name (obfd, ".got");
9161 if (s == NULL)
9162 s = bfd_get_section_by_name (obfd, ".toc");
9163 if (s == NULL)
9164 s = bfd_get_section_by_name (obfd, ".tocbss");
9165 if (s == NULL)
9166 s = bfd_get_section_by_name (obfd, ".plt");
9167 if (s == NULL)
9168 {
9169 /* This may happen for
9170 o references to TOC base (SYM@toc / TOC[tc0]) without a
9171 .toc directive
9172 o bad linker script
9173 o --gc-sections and empty TOC sections
9174
9175 FIXME: Warn user? */
9176
9177 /* Look for a likely section. We probably won't even be
9178 using TOCstart. */
9179 for (s = obfd->sections; s != NULL; s = s->next)
9180 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY))
9181 == (SEC_ALLOC | SEC_SMALL_DATA))
9182 break;
9183 if (s == NULL)
9184 for (s = obfd->sections; s != NULL; s = s->next)
9185 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA))
9186 == (SEC_ALLOC | SEC_SMALL_DATA))
9187 break;
9188 if (s == NULL)
9189 for (s = obfd->sections; s != NULL; s = s->next)
9190 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
9191 break;
9192 if (s == NULL)
9193 for (s = obfd->sections; s != NULL; s = s->next)
9194 if ((s->flags & SEC_ALLOC) == SEC_ALLOC)
9195 break;
9196 }
9197
9198 TOCstart = 0;
9199 if (s != NULL)
9200 TOCstart = s->output_section->vma + s->output_offset;
9201
9202 return TOCstart;
9203 }
9204
9205 /* Build all the stubs associated with the current output file.
9206 The stubs are kept in a hash table attached to the main linker
9207 hash table. This function is called via gldelf64ppc_finish. */
9208
9209 bfd_boolean
ppc64_elf_build_stubs(bfd_boolean emit_stub_syms,struct bfd_link_info * info,char ** stats)9210 ppc64_elf_build_stubs (bfd_boolean emit_stub_syms,
9211 struct bfd_link_info *info,
9212 char **stats)
9213 {
9214 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9215 asection *stub_sec;
9216 bfd_byte *p;
9217 int stub_sec_count = 0;
9218
9219 htab->emit_stub_syms = emit_stub_syms;
9220
9221 /* Allocate memory to hold the linker stubs. */
9222 for (stub_sec = htab->stub_bfd->sections;
9223 stub_sec != NULL;
9224 stub_sec = stub_sec->next)
9225 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0
9226 && stub_sec->size != 0)
9227 {
9228 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size);
9229 if (stub_sec->contents == NULL)
9230 return FALSE;
9231 /* We want to check that built size is the same as calculated
9232 size. rawsize is a convenient location to use. */
9233 stub_sec->rawsize = stub_sec->size;
9234 stub_sec->size = 0;
9235 }
9236
9237 if (htab->plt != NULL)
9238 {
9239 unsigned int indx;
9240 bfd_vma plt0;
9241
9242 /* Build the .glink plt call stub. */
9243 plt0 = (htab->plt->output_section->vma
9244 + htab->plt->output_offset
9245 - (htab->glink->output_section->vma
9246 + htab->glink->output_offset
9247 + GLINK_CALL_STUB_SIZE));
9248 if (plt0 + 0x80008000 > 0xffffffff)
9249 {
9250 (*_bfd_error_handler) (_(".glink and .plt too far apart"));
9251 bfd_set_error (bfd_error_bad_value);
9252 return FALSE;
9253 }
9254
9255 if (htab->emit_stub_syms)
9256 {
9257 struct elf_link_hash_entry *h;
9258 h = elf_link_hash_lookup (&htab->elf, "__glink", TRUE, FALSE, FALSE);
9259 if (h == NULL)
9260 return FALSE;
9261 if (h->root.type == bfd_link_hash_new)
9262 {
9263 h->root.type = bfd_link_hash_defined;
9264 h->root.u.def.section = htab->glink;
9265 h->root.u.def.value = 0;
9266 h->ref_regular = 1;
9267 h->def_regular = 1;
9268 h->ref_regular_nonweak = 1;
9269 h->forced_local = 1;
9270 h->non_elf = 0;
9271 }
9272 }
9273 p = htab->glink->contents;
9274 bfd_put_32 (htab->glink->owner, MFCTR_R12, p);
9275 p += 4;
9276 bfd_put_32 (htab->glink->owner, SLDI_R11_R0_3, p);
9277 p += 4;
9278 bfd_put_32 (htab->glink->owner, ADDIC_R2_R0_32K, p);
9279 p += 4;
9280 bfd_put_32 (htab->glink->owner, SUB_R12_R12_R11, p);
9281 p += 4;
9282 bfd_put_32 (htab->glink->owner, SRADI_R2_R2_63, p);
9283 p += 4;
9284 bfd_put_32 (htab->glink->owner, SLDI_R11_R0_2, p);
9285 p += 4;
9286 bfd_put_32 (htab->glink->owner, AND_R2_R2_R11, p);
9287 p += 4;
9288 bfd_put_32 (htab->glink->owner, SUB_R12_R12_R11, p);
9289 p += 4;
9290 bfd_put_32 (htab->glink->owner, ADD_R12_R12_R2, p);
9291 p += 4;
9292 bfd_put_32 (htab->glink->owner, ADDIS_R12_R12 | PPC_HA (plt0), p);
9293 p += 4;
9294 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | PPC_LO (plt0), p);
9295 p += 4;
9296 bfd_put_32 (htab->glink->owner, ADDI_R12_R12 | PPC_LO (plt0), p);
9297 p += 4;
9298 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p);
9299 p += 4;
9300 bfd_put_32 (htab->glink->owner, MTCTR_R11, p);
9301 p += 4;
9302 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p);
9303 p += 4;
9304 bfd_put_32 (htab->glink->owner, BCTR, p);
9305 p += 4;
9306
9307 /* Build the .glink lazy link call stubs. */
9308 indx = 0;
9309 while (p < htab->glink->contents + htab->glink->size)
9310 {
9311 if (indx < 0x8000)
9312 {
9313 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p);
9314 p += 4;
9315 }
9316 else
9317 {
9318 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p);
9319 p += 4;
9320 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p);
9321 p += 4;
9322 }
9323 bfd_put_32 (htab->glink->owner,
9324 B_DOT | ((htab->glink->contents - p) & 0x3fffffc), p);
9325 indx++;
9326 p += 4;
9327 }
9328 htab->glink->rawsize = p - htab->glink->contents;
9329 }
9330
9331 if (htab->brlt->size != 0)
9332 {
9333 htab->brlt->contents = bfd_zalloc (htab->brlt->owner,
9334 htab->brlt->size);
9335 if (htab->brlt->contents == NULL)
9336 return FALSE;
9337 }
9338 if (htab->relbrlt != NULL && htab->relbrlt->size != 0)
9339 {
9340 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner,
9341 htab->relbrlt->size);
9342 if (htab->relbrlt->contents == NULL)
9343 return FALSE;
9344 }
9345
9346 /* Build the stubs as directed by the stub hash table. */
9347 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info);
9348
9349 for (stub_sec = htab->stub_bfd->sections;
9350 stub_sec != NULL;
9351 stub_sec = stub_sec->next)
9352 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
9353 {
9354 stub_sec_count += 1;
9355 if (stub_sec->rawsize != stub_sec->size)
9356 break;
9357 }
9358
9359 if (stub_sec != NULL
9360 || htab->glink->rawsize != htab->glink->size)
9361 {
9362 htab->stub_error = TRUE;
9363 (*_bfd_error_handler) (_("stubs don't match calculated size"));
9364 }
9365
9366 if (htab->stub_error)
9367 return FALSE;
9368
9369 if (stats != NULL)
9370 {
9371 *stats = bfd_malloc (500);
9372 if (*stats == NULL)
9373 return FALSE;
9374
9375 sprintf (*stats, _("linker stubs in %u group%s\n"
9376 " branch %lu\n"
9377 " toc adjust %lu\n"
9378 " long branch %lu\n"
9379 " long toc adj %lu\n"
9380 " plt call %lu"),
9381 stub_sec_count,
9382 stub_sec_count == 1 ? "" : "s",
9383 htab->stub_count[ppc_stub_long_branch - 1],
9384 htab->stub_count[ppc_stub_long_branch_r2off - 1],
9385 htab->stub_count[ppc_stub_plt_branch - 1],
9386 htab->stub_count[ppc_stub_plt_branch_r2off - 1],
9387 htab->stub_count[ppc_stub_plt_call - 1]);
9388 }
9389 return TRUE;
9390 }
9391
9392 /* This function undoes the changes made by add_symbol_adjust. */
9393
9394 static bfd_boolean
undo_symbol_twiddle(struct elf_link_hash_entry * h,void * inf ATTRIBUTE_UNUSED)9395 undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED)
9396 {
9397 struct ppc_link_hash_entry *eh;
9398
9399 if (h->root.type == bfd_link_hash_indirect)
9400 return TRUE;
9401
9402 if (h->root.type == bfd_link_hash_warning)
9403 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9404
9405 eh = (struct ppc_link_hash_entry *) h;
9406 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined)
9407 return TRUE;
9408
9409 eh->elf.root.type = bfd_link_hash_undefined;
9410 return TRUE;
9411 }
9412
9413 void
ppc64_elf_restore_symbols(struct bfd_link_info * info)9414 ppc64_elf_restore_symbols (struct bfd_link_info *info)
9415 {
9416 struct ppc_link_hash_table *htab = ppc_hash_table (info);
9417 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info);
9418 }
9419
9420 /* The RELOCATE_SECTION function is called by the ELF backend linker
9421 to handle the relocations for a section.
9422
9423 The relocs are always passed as Rela structures; if the section
9424 actually uses Rel structures, the r_addend field will always be
9425 zero.
9426
9427 This function is responsible for adjust the section contents as
9428 necessary, and (if using Rela relocs and generating a
9429 relocatable output file) adjusting the reloc addend as
9430 necessary.
9431
9432 This function does not have to worry about setting the reloc
9433 address or the reloc symbol index.
9434
9435 LOCAL_SYMS is a pointer to the swapped in local symbols.
9436
9437 LOCAL_SECTIONS is an array giving the section in the input file
9438 corresponding to the st_shndx field of each local symbol.
9439
9440 The global hash table entry for the global symbols can be found
9441 via elf_sym_hashes (input_bfd).
9442
9443 When generating relocatable output, this function must handle
9444 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
9445 going to be the section symbol corresponding to the output
9446 section, which means that the addend must be adjusted
9447 accordingly. */
9448
9449 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)9450 ppc64_elf_relocate_section (bfd *output_bfd,
9451 struct bfd_link_info *info,
9452 bfd *input_bfd,
9453 asection *input_section,
9454 bfd_byte *contents,
9455 Elf_Internal_Rela *relocs,
9456 Elf_Internal_Sym *local_syms,
9457 asection **local_sections)
9458 {
9459 struct ppc_link_hash_table *htab;
9460 Elf_Internal_Shdr *symtab_hdr;
9461 struct elf_link_hash_entry **sym_hashes;
9462 Elf_Internal_Rela *rel;
9463 Elf_Internal_Rela *relend;
9464 Elf_Internal_Rela outrel;
9465 bfd_byte *loc;
9466 struct got_entry **local_got_ents;
9467 bfd_vma TOCstart;
9468 bfd_boolean ret = TRUE;
9469 bfd_boolean is_opd;
9470 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */
9471 bfd_boolean is_power4 = FALSE;
9472
9473 if (info->relocatable)
9474 return TRUE;
9475
9476 /* Initialize howto table if needed. */
9477 if (!ppc64_elf_howto_table[R_PPC64_ADDR32])
9478 ppc_howto_init ();
9479
9480 htab = ppc_hash_table (info);
9481
9482 /* Don't relocate stub sections. */
9483 if (input_section->owner == htab->stub_bfd)
9484 return TRUE;
9485
9486 local_got_ents = elf_local_got_ents (input_bfd);
9487 TOCstart = elf_gp (output_bfd);
9488 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9489 sym_hashes = elf_sym_hashes (input_bfd);
9490 is_opd = ppc64_elf_section_data (input_section)->opd.adjust != NULL;
9491
9492 rel = relocs;
9493 relend = relocs + input_section->reloc_count;
9494 for (; rel < relend; rel++)
9495 {
9496 enum elf_ppc64_reloc_type r_type;
9497 bfd_vma addend;
9498 bfd_reloc_status_type r;
9499 Elf_Internal_Sym *sym;
9500 asection *sec;
9501 struct elf_link_hash_entry *h_elf;
9502 struct ppc_link_hash_entry *h;
9503 struct ppc_link_hash_entry *fdh;
9504 const char *sym_name;
9505 unsigned long r_symndx, toc_symndx;
9506 char tls_mask, tls_gd, tls_type;
9507 char sym_type;
9508 bfd_vma relocation;
9509 bfd_boolean unresolved_reloc;
9510 bfd_boolean warned;
9511 unsigned long insn, mask;
9512 struct ppc_stub_hash_entry *stub_entry;
9513 bfd_vma max_br_offset;
9514 bfd_vma from;
9515
9516 r_type = ELF64_R_TYPE (rel->r_info);
9517 r_symndx = ELF64_R_SYM (rel->r_info);
9518
9519 /* For old style R_PPC64_TOC relocs with a zero symbol, use the
9520 symbol of the previous ADDR64 reloc. The symbol gives us the
9521 proper TOC base to use. */
9522 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC)
9523 && rel != relocs
9524 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64
9525 && is_opd)
9526 r_symndx = ELF64_R_SYM (rel[-1].r_info);
9527
9528 sym = NULL;
9529 sec = NULL;
9530 h_elf = NULL;
9531 sym_name = NULL;
9532 unresolved_reloc = FALSE;
9533 warned = FALSE;
9534
9535 if (r_symndx < symtab_hdr->sh_info)
9536 {
9537 /* It's a local symbol. */
9538 long *opd_adjust;
9539
9540 sym = local_syms + r_symndx;
9541 sec = local_sections[r_symndx];
9542 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec);
9543 sym_type = ELF64_ST_TYPE (sym->st_info);
9544 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
9545 opd_adjust = get_opd_info (sec);
9546 if (opd_adjust != NULL)
9547 {
9548 long adjust = opd_adjust[(sym->st_value + rel->r_addend) / 8];
9549 if (adjust == -1)
9550 relocation = 0;
9551 else
9552 relocation += adjust;
9553 }
9554 }
9555 else
9556 {
9557 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
9558 r_symndx, symtab_hdr, sym_hashes,
9559 h_elf, sec, relocation,
9560 unresolved_reloc, warned);
9561 sym_name = h_elf->root.root.string;
9562 sym_type = h_elf->type;
9563 }
9564 h = (struct ppc_link_hash_entry *) h_elf;
9565
9566 /* TLS optimizations. Replace instruction sequences and relocs
9567 based on information we collected in tls_optimize. We edit
9568 RELOCS so that --emit-relocs will output something sensible
9569 for the final instruction stream. */
9570 tls_mask = 0;
9571 tls_gd = 0;
9572 toc_symndx = 0;
9573 if (IS_PPC64_TLS_RELOC (r_type))
9574 {
9575 if (h != NULL)
9576 tls_mask = h->tls_mask;
9577 else if (local_got_ents != NULL)
9578 {
9579 char *lgot_masks;
9580 lgot_masks = (char *) (local_got_ents + symtab_hdr->sh_info);
9581 tls_mask = lgot_masks[r_symndx];
9582 }
9583 if (tls_mask == 0 && r_type == R_PPC64_TLS)
9584 {
9585 /* Check for toc tls entries. */
9586 char *toc_tls;
9587
9588 if (!get_tls_mask (&toc_tls, &toc_symndx, &local_syms,
9589 rel, input_bfd))
9590 return FALSE;
9591
9592 if (toc_tls)
9593 tls_mask = *toc_tls;
9594 }
9595 }
9596
9597 /* Check that tls relocs are used with tls syms, and non-tls
9598 relocs are used with non-tls syms. */
9599 if (r_symndx != 0
9600 && r_type != R_PPC64_NONE
9601 && (h == NULL
9602 || h->elf.root.type == bfd_link_hash_defined
9603 || h->elf.root.type == bfd_link_hash_defweak)
9604 && IS_PPC64_TLS_RELOC (r_type) != (sym_type == STT_TLS))
9605 {
9606 if (r_type == R_PPC64_TLS && tls_mask != 0)
9607 /* R_PPC64_TLS is OK against a symbol in the TOC. */
9608 ;
9609 else
9610 (*_bfd_error_handler)
9611 (sym_type == STT_TLS
9612 ? _("%B(%A+0x%lx): %s used with TLS symbol %s")
9613 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s"),
9614 input_bfd,
9615 input_section,
9616 (long) rel->r_offset,
9617 ppc64_elf_howto_table[r_type]->name,
9618 sym_name);
9619 }
9620
9621 /* Ensure reloc mapping code below stays sane. */
9622 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1
9623 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1
9624 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3)
9625 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3)
9626 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3)
9627 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3)
9628 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3)
9629 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3)
9630 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3)
9631 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3))
9632 abort ();
9633
9634 switch (r_type)
9635 {
9636 default:
9637 break;
9638
9639 case R_PPC64_TOC16:
9640 case R_PPC64_TOC16_LO:
9641 case R_PPC64_TOC16_DS:
9642 case R_PPC64_TOC16_LO_DS:
9643 {
9644 /* Check for toc tls entries. */
9645 char *toc_tls;
9646 int retval;
9647
9648 retval = get_tls_mask (&toc_tls, &toc_symndx, &local_syms,
9649 rel, input_bfd);
9650 if (retval == 0)
9651 return FALSE;
9652
9653 if (toc_tls)
9654 {
9655 tls_mask = *toc_tls;
9656 if (r_type == R_PPC64_TOC16_DS
9657 || r_type == R_PPC64_TOC16_LO_DS)
9658 {
9659 if (tls_mask != 0
9660 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0)
9661 goto toctprel;
9662 }
9663 else
9664 {
9665 /* If we found a GD reloc pair, then we might be
9666 doing a GD->IE transition. */
9667 if (retval == 2)
9668 {
9669 tls_gd = TLS_TPRELGD;
9670 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
9671 goto tls_get_addr_check;
9672 }
9673 else if (retval == 3)
9674 {
9675 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
9676 goto tls_get_addr_check;
9677 }
9678 }
9679 }
9680 }
9681 break;
9682
9683 case R_PPC64_GOT_TPREL16_DS:
9684 case R_PPC64_GOT_TPREL16_LO_DS:
9685 if (tls_mask != 0
9686 && (tls_mask & TLS_TPREL) == 0)
9687 {
9688 toctprel:
9689 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - 2);
9690 insn &= 31 << 21;
9691 insn |= 0x3c0d0000; /* addis 0,13,0 */
9692 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - 2);
9693 r_type = R_PPC64_TPREL16_HA;
9694 if (toc_symndx != 0)
9695 {
9696 rel->r_info = ELF64_R_INFO (toc_symndx, r_type);
9697 /* We changed the symbol. Start over in order to
9698 get h, sym, sec etc. right. */
9699 rel--;
9700 continue;
9701 }
9702 else
9703 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9704 }
9705 break;
9706
9707 case R_PPC64_TLS:
9708 if (tls_mask != 0
9709 && (tls_mask & TLS_TPREL) == 0)
9710 {
9711 bfd_vma rtra;
9712 insn = bfd_get_32 (output_bfd, contents + rel->r_offset);
9713 if ((insn & ((0x3f << 26) | (31 << 11)))
9714 == ((31 << 26) | (13 << 11)))
9715 rtra = insn & ((1 << 26) - (1 << 16));
9716 else if ((insn & ((0x3f << 26) | (31 << 16)))
9717 == ((31 << 26) | (13 << 16)))
9718 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5);
9719 else
9720 abort ();
9721 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1)
9722 /* add -> addi. */
9723 insn = 14 << 26;
9724 else if ((insn & (31 << 1)) == 23 << 1
9725 && ((insn & (31 << 6)) < 14 << 6
9726 || ((insn & (31 << 6)) >= 16 << 6
9727 && (insn & (31 << 6)) < 24 << 6)))
9728 /* load and store indexed -> dform. */
9729 insn = (32 | ((insn >> 6) & 31)) << 26;
9730 else if ((insn & (31 << 1)) == 21 << 1
9731 && (insn & (0x1a << 6)) == 0)
9732 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
9733 insn = (((58 | ((insn >> 6) & 4)) << 26)
9734 | ((insn >> 6) & 1));
9735 else if ((insn & (31 << 1)) == 21 << 1
9736 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1)
9737 /* lwax -> lwa. */
9738 insn = (58 << 26) | 2;
9739 else
9740 abort ();
9741 insn |= rtra;
9742 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
9743 /* Was PPC64_TLS which sits on insn boundary, now
9744 PPC64_TPREL16_LO which is at insn+2. */
9745 rel->r_offset += 2;
9746 r_type = R_PPC64_TPREL16_LO;
9747 if (toc_symndx != 0)
9748 {
9749 rel->r_info = ELF64_R_INFO (toc_symndx, r_type);
9750 /* We changed the symbol. Start over in order to
9751 get h, sym, sec etc. right. */
9752 rel--;
9753 continue;
9754 }
9755 else
9756 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9757 }
9758 break;
9759
9760 case R_PPC64_GOT_TLSGD16_HI:
9761 case R_PPC64_GOT_TLSGD16_HA:
9762 tls_gd = TLS_TPRELGD;
9763 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
9764 goto tls_gdld_hi;
9765 break;
9766
9767 case R_PPC64_GOT_TLSLD16_HI:
9768 case R_PPC64_GOT_TLSLD16_HA:
9769 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
9770 {
9771 tls_gdld_hi:
9772 if ((tls_mask & tls_gd) != 0)
9773 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3)
9774 + R_PPC64_GOT_TPREL16_DS);
9775 else
9776 {
9777 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset);
9778 rel->r_offset -= 2;
9779 r_type = R_PPC64_NONE;
9780 }
9781 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9782 }
9783 break;
9784
9785 case R_PPC64_GOT_TLSGD16:
9786 case R_PPC64_GOT_TLSGD16_LO:
9787 tls_gd = TLS_TPRELGD;
9788 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0)
9789 goto tls_get_addr_check;
9790 break;
9791
9792 case R_PPC64_GOT_TLSLD16:
9793 case R_PPC64_GOT_TLSLD16_LO:
9794 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0)
9795 {
9796 tls_get_addr_check:
9797 if (rel + 1 < relend)
9798 {
9799 enum elf_ppc64_reloc_type r_type2;
9800 unsigned long r_symndx2;
9801 struct elf_link_hash_entry *h2;
9802 bfd_vma insn1, insn2, insn3;
9803 bfd_vma offset;
9804
9805 /* The next instruction should be a call to
9806 __tls_get_addr. Peek at the reloc to be sure. */
9807 r_type2 = ELF64_R_TYPE (rel[1].r_info);
9808 r_symndx2 = ELF64_R_SYM (rel[1].r_info);
9809 if (r_symndx2 < symtab_hdr->sh_info
9810 || (r_type2 != R_PPC64_REL14
9811 && r_type2 != R_PPC64_REL14_BRTAKEN
9812 && r_type2 != R_PPC64_REL14_BRNTAKEN
9813 && r_type2 != R_PPC64_REL24))
9814 break;
9815
9816 h2 = sym_hashes[r_symndx2 - symtab_hdr->sh_info];
9817 while (h2->root.type == bfd_link_hash_indirect
9818 || h2->root.type == bfd_link_hash_warning)
9819 h2 = (struct elf_link_hash_entry *) h2->root.u.i.link;
9820 if (h2 == NULL || (h2 != &htab->tls_get_addr->elf
9821 && h2 != &htab->tls_get_addr_fd->elf))
9822 break;
9823
9824 /* OK, it checks out. Replace the call. */
9825 offset = rel[1].r_offset;
9826 insn1 = bfd_get_32 (output_bfd,
9827 contents + rel->r_offset - 2);
9828 insn3 = bfd_get_32 (output_bfd,
9829 contents + offset + 4);
9830 if ((tls_mask & tls_gd) != 0)
9831 {
9832 /* IE */
9833 insn1 &= (1 << 26) - (1 << 2);
9834 insn1 |= 58 << 26; /* ld */
9835 insn2 = 0x7c636a14; /* add 3,3,13 */
9836 rel[1].r_info = ELF64_R_INFO (r_symndx2, R_PPC64_NONE);
9837 if ((tls_mask & TLS_EXPLICIT) == 0)
9838 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3)
9839 + R_PPC64_GOT_TPREL16_DS);
9840 else
9841 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16;
9842 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9843 }
9844 else
9845 {
9846 /* LE */
9847 insn1 = 0x3c6d0000; /* addis 3,13,0 */
9848 insn2 = 0x38630000; /* addi 3,3,0 */
9849 if (tls_gd == 0)
9850 {
9851 /* Was an LD reloc. */
9852 r_symndx = 0;
9853 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET;
9854 rel[1].r_addend = htab->elf.tls_sec->vma + DTP_OFFSET;
9855 }
9856 else if (toc_symndx != 0)
9857 r_symndx = toc_symndx;
9858 r_type = R_PPC64_TPREL16_HA;
9859 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9860 rel[1].r_info = ELF64_R_INFO (r_symndx,
9861 R_PPC64_TPREL16_LO);
9862 rel[1].r_offset += 2;
9863 }
9864 if (insn3 == NOP
9865 || insn3 == CROR_151515 || insn3 == CROR_313131)
9866 {
9867 insn3 = insn2;
9868 insn2 = NOP;
9869 rel[1].r_offset += 4;
9870 }
9871 bfd_put_32 (output_bfd, insn1, contents + rel->r_offset - 2);
9872 bfd_put_32 (output_bfd, insn2, contents + offset);
9873 bfd_put_32 (output_bfd, insn3, contents + offset + 4);
9874 if (tls_gd == 0 || toc_symndx != 0)
9875 {
9876 /* We changed the symbol. Start over in order
9877 to get h, sym, sec etc. right. */
9878 rel--;
9879 continue;
9880 }
9881 }
9882 }
9883 break;
9884
9885 case R_PPC64_DTPMOD64:
9886 if (rel + 1 < relend
9887 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)
9888 && rel[1].r_offset == rel->r_offset + 8)
9889 {
9890 if ((tls_mask & TLS_GD) == 0)
9891 {
9892 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE);
9893 if ((tls_mask & TLS_TPRELGD) != 0)
9894 r_type = R_PPC64_TPREL64;
9895 else
9896 {
9897 bfd_put_64 (output_bfd, 1, contents + rel->r_offset);
9898 r_type = R_PPC64_NONE;
9899 }
9900 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9901 }
9902 }
9903 else
9904 {
9905 if ((tls_mask & TLS_LD) == 0)
9906 {
9907 bfd_put_64 (output_bfd, 1, contents + rel->r_offset);
9908 r_type = R_PPC64_NONE;
9909 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9910 }
9911 }
9912 break;
9913
9914 case R_PPC64_TPREL64:
9915 if ((tls_mask & TLS_TPREL) == 0)
9916 {
9917 r_type = R_PPC64_NONE;
9918 rel->r_info = ELF64_R_INFO (r_symndx, r_type);
9919 }
9920 break;
9921 }
9922
9923 /* Handle other relocations that tweak non-addend part of insn. */
9924 insn = 0;
9925 max_br_offset = 1 << 25;
9926 addend = rel->r_addend;
9927 switch (r_type)
9928 {
9929 default:
9930 break;
9931
9932 /* Branch taken prediction relocations. */
9933 case R_PPC64_ADDR14_BRTAKEN:
9934 case R_PPC64_REL14_BRTAKEN:
9935 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */
9936 /* Fall thru. */
9937
9938 /* Branch not taken prediction relocations. */
9939 case R_PPC64_ADDR14_BRNTAKEN:
9940 case R_PPC64_REL14_BRNTAKEN:
9941 insn |= bfd_get_32 (output_bfd,
9942 contents + rel->r_offset) & ~(0x01 << 21);
9943 /* Fall thru. */
9944
9945 case R_PPC64_REL14:
9946 max_br_offset = 1 << 15;
9947 /* Fall thru. */
9948
9949 case R_PPC64_REL24:
9950 /* Calls to functions with a different TOC, such as calls to
9951 shared objects, need to alter the TOC pointer. This is
9952 done using a linkage stub. A REL24 branching to these
9953 linkage stubs needs to be followed by a nop, as the nop
9954 will be replaced with an instruction to restore the TOC
9955 base pointer. */
9956 stub_entry = NULL;
9957 fdh = h;
9958 if (((h != NULL
9959 && (((fdh = h->oh) != NULL
9960 && fdh->elf.plt.plist != NULL)
9961 || (fdh = h)->elf.plt.plist != NULL))
9962 || (sec != NULL
9963 && sec->output_section != NULL
9964 && sec->id <= htab->top_id
9965 && (htab->stub_group[sec->id].toc_off
9966 != htab->stub_group[input_section->id].toc_off)))
9967 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh,
9968 rel, htab)) != NULL
9969 && (stub_entry->stub_type == ppc_stub_plt_call
9970 || stub_entry->stub_type == ppc_stub_plt_branch_r2off
9971 || stub_entry->stub_type == ppc_stub_long_branch_r2off))
9972 {
9973 bfd_boolean can_plt_call = FALSE;
9974
9975 if (rel->r_offset + 8 <= input_section->size)
9976 {
9977 unsigned long nop;
9978 nop = bfd_get_32 (input_bfd, contents + rel->r_offset + 4);
9979 if (nop == NOP
9980 || nop == CROR_151515 || nop == CROR_313131)
9981 {
9982 bfd_put_32 (input_bfd, LD_R2_40R1,
9983 contents + rel->r_offset + 4);
9984 can_plt_call = TRUE;
9985 }
9986 }
9987
9988 if (!can_plt_call)
9989 {
9990 if (stub_entry->stub_type == ppc_stub_plt_call)
9991 {
9992 /* If this is a plain branch rather than a branch
9993 and link, don't require a nop. */
9994 unsigned long br;
9995 br = bfd_get_32 (input_bfd, contents + rel->r_offset);
9996 if ((br & 1) == 0)
9997 can_plt_call = TRUE;
9998 }
9999 else if (h != NULL
10000 && strcmp (h->elf.root.root.string,
10001 ".__libc_start_main") == 0)
10002 {
10003 /* Allow crt1 branch to go via a toc adjusting stub. */
10004 can_plt_call = TRUE;
10005 }
10006 else
10007 {
10008 if (strcmp (input_section->output_section->name,
10009 ".init") == 0
10010 || strcmp (input_section->output_section->name,
10011 ".fini") == 0)
10012 (*_bfd_error_handler)
10013 (_("%B(%A+0x%lx): automatic multiple TOCs "
10014 "not supported using your crt files; "
10015 "recompile with -mminimal-toc or upgrade gcc"),
10016 input_bfd,
10017 input_section,
10018 (long) rel->r_offset);
10019 else
10020 (*_bfd_error_handler)
10021 (_("%B(%A+0x%lx): sibling call optimization to `%s' "
10022 "does not allow automatic multiple TOCs; "
10023 "recompile with -mminimal-toc or "
10024 "-fno-optimize-sibling-calls, "
10025 "or make `%s' extern"),
10026 input_bfd,
10027 input_section,
10028 (long) rel->r_offset,
10029 sym_name,
10030 sym_name);
10031 bfd_set_error (bfd_error_bad_value);
10032 ret = FALSE;
10033 }
10034 }
10035
10036 if (can_plt_call
10037 && stub_entry->stub_type == ppc_stub_plt_call)
10038 unresolved_reloc = FALSE;
10039 }
10040
10041 if (stub_entry == NULL
10042 && get_opd_info (sec) != NULL)
10043 {
10044 /* The branch destination is the value of the opd entry. */
10045 bfd_vma off = (relocation - sec->output_section->vma
10046 - sec->output_offset + rel->r_addend);
10047 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL);
10048 if (dest != (bfd_vma) -1)
10049 {
10050 relocation = dest;
10051 addend = 0;
10052 }
10053 }
10054
10055 /* If the branch is out of reach we ought to have a long
10056 branch stub. */
10057 from = (rel->r_offset
10058 + input_section->output_offset
10059 + input_section->output_section->vma);
10060
10061 if (stub_entry == NULL
10062 && (relocation + rel->r_addend - from + max_br_offset
10063 >= 2 * max_br_offset)
10064 && r_type != R_PPC64_ADDR14_BRTAKEN
10065 && r_type != R_PPC64_ADDR14_BRNTAKEN)
10066 stub_entry = ppc_get_stub_entry (input_section, sec, h, rel,
10067 htab);
10068
10069 if (stub_entry != NULL)
10070 {
10071 /* Munge up the value and addend so that we call the stub
10072 rather than the procedure directly. */
10073 relocation = (stub_entry->stub_offset
10074 + stub_entry->stub_sec->output_offset
10075 + stub_entry->stub_sec->output_section->vma);
10076 addend = 0;
10077 }
10078
10079 if (insn != 0)
10080 {
10081 if (is_power4)
10082 {
10083 /* Set 'a' bit. This is 0b00010 in BO field for branch
10084 on CR(BI) insns (BO == 001at or 011at), and 0b01000
10085 for branch on CTR insns (BO == 1a00t or 1a01t). */
10086 if ((insn & (0x14 << 21)) == (0x04 << 21))
10087 insn |= 0x02 << 21;
10088 else if ((insn & (0x14 << 21)) == (0x10 << 21))
10089 insn |= 0x08 << 21;
10090 else
10091 break;
10092 }
10093 else
10094 {
10095 /* Invert 'y' bit if not the default. */
10096 if ((bfd_signed_vma) (relocation + rel->r_addend - from) < 0)
10097 insn ^= 0x01 << 21;
10098 }
10099
10100 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
10101 }
10102
10103 /* NOP out calls to undefined weak functions.
10104 We can thus call a weak function without first
10105 checking whether the function is defined. */
10106 else if (h != NULL
10107 && h->elf.root.type == bfd_link_hash_undefweak
10108 && r_type == R_PPC64_REL24
10109 && relocation == 0
10110 && rel->r_addend == 0)
10111 {
10112 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset);
10113 continue;
10114 }
10115 break;
10116 }
10117
10118 /* Set `addend'. */
10119 tls_type = 0;
10120 switch (r_type)
10121 {
10122 default:
10123 (*_bfd_error_handler)
10124 (_("%B: unknown relocation type %d for symbol %s"),
10125 input_bfd, (int) r_type, sym_name);
10126
10127 bfd_set_error (bfd_error_bad_value);
10128 ret = FALSE;
10129 continue;
10130
10131 case R_PPC64_NONE:
10132 case R_PPC64_TLS:
10133 case R_PPC64_GNU_VTINHERIT:
10134 case R_PPC64_GNU_VTENTRY:
10135 continue;
10136
10137 /* GOT16 relocations. Like an ADDR16 using the symbol's
10138 address in the GOT as relocation value instead of the
10139 symbol's value itself. Also, create a GOT entry for the
10140 symbol and put the symbol value there. */
10141 case R_PPC64_GOT_TLSGD16:
10142 case R_PPC64_GOT_TLSGD16_LO:
10143 case R_PPC64_GOT_TLSGD16_HI:
10144 case R_PPC64_GOT_TLSGD16_HA:
10145 tls_type = TLS_TLS | TLS_GD;
10146 goto dogot;
10147
10148 case R_PPC64_GOT_TLSLD16:
10149 case R_PPC64_GOT_TLSLD16_LO:
10150 case R_PPC64_GOT_TLSLD16_HI:
10151 case R_PPC64_GOT_TLSLD16_HA:
10152 tls_type = TLS_TLS | TLS_LD;
10153 goto dogot;
10154
10155 case R_PPC64_GOT_TPREL16_DS:
10156 case R_PPC64_GOT_TPREL16_LO_DS:
10157 case R_PPC64_GOT_TPREL16_HI:
10158 case R_PPC64_GOT_TPREL16_HA:
10159 tls_type = TLS_TLS | TLS_TPREL;
10160 goto dogot;
10161
10162 case R_PPC64_GOT_DTPREL16_DS:
10163 case R_PPC64_GOT_DTPREL16_LO_DS:
10164 case R_PPC64_GOT_DTPREL16_HI:
10165 case R_PPC64_GOT_DTPREL16_HA:
10166 tls_type = TLS_TLS | TLS_DTPREL;
10167 goto dogot;
10168
10169 case R_PPC64_GOT16:
10170 case R_PPC64_GOT16_LO:
10171 case R_PPC64_GOT16_HI:
10172 case R_PPC64_GOT16_HA:
10173 case R_PPC64_GOT16_DS:
10174 case R_PPC64_GOT16_LO_DS:
10175 dogot:
10176 {
10177 /* Relocation is to the entry for this symbol in the global
10178 offset table. */
10179 asection *got;
10180 bfd_vma *offp;
10181 bfd_vma off;
10182 unsigned long indx = 0;
10183
10184 if (tls_type == (TLS_TLS | TLS_LD)
10185 && (h == NULL
10186 || !h->elf.def_dynamic))
10187 offp = &ppc64_tlsld_got (input_bfd)->offset;
10188 else
10189 {
10190 struct got_entry *ent;
10191
10192 if (h != NULL)
10193 {
10194 bfd_boolean dyn = htab->elf.dynamic_sections_created;
10195 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared,
10196 &h->elf)
10197 || (info->shared
10198 && SYMBOL_REFERENCES_LOCAL (info, &h->elf)))
10199 /* This is actually a static link, or it is a
10200 -Bsymbolic link and the symbol is defined
10201 locally, or the symbol was forced to be local
10202 because of a version file. */
10203 ;
10204 else
10205 {
10206 indx = h->elf.dynindx;
10207 unresolved_reloc = FALSE;
10208 }
10209 ent = h->elf.got.glist;
10210 }
10211 else
10212 {
10213 if (local_got_ents == NULL)
10214 abort ();
10215 ent = local_got_ents[r_symndx];
10216 }
10217
10218 for (; ent != NULL; ent = ent->next)
10219 if (ent->addend == rel->r_addend
10220 && ent->owner == input_bfd
10221 && ent->tls_type == tls_type)
10222 break;
10223 if (ent == NULL)
10224 abort ();
10225 offp = &ent->got.offset;
10226 }
10227
10228 got = ppc64_elf_tdata (input_bfd)->got;
10229 if (got == NULL)
10230 abort ();
10231
10232 /* The offset must always be a multiple of 8. We use the
10233 least significant bit to record whether we have already
10234 processed this entry. */
10235 off = *offp;
10236 if ((off & 1) != 0)
10237 off &= ~1;
10238 else
10239 {
10240 /* Generate relocs for the dynamic linker, except in
10241 the case of TLSLD where we'll use one entry per
10242 module. */
10243 asection *relgot = ppc64_elf_tdata (input_bfd)->relgot;
10244
10245 *offp = off | 1;
10246 if ((info->shared || indx != 0)
10247 && (h == NULL
10248 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT
10249 || h->elf.root.type != bfd_link_hash_undefweak))
10250 {
10251 outrel.r_offset = (got->output_section->vma
10252 + got->output_offset
10253 + off);
10254 outrel.r_addend = rel->r_addend;
10255 if (tls_type & (TLS_LD | TLS_GD))
10256 {
10257 outrel.r_addend = 0;
10258 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64);
10259 if (tls_type == (TLS_TLS | TLS_GD))
10260 {
10261 loc = relgot->contents;
10262 loc += (relgot->reloc_count++
10263 * sizeof (Elf64_External_Rela));
10264 bfd_elf64_swap_reloca_out (output_bfd,
10265 &outrel, loc);
10266 outrel.r_offset += 8;
10267 outrel.r_addend = rel->r_addend;
10268 outrel.r_info
10269 = ELF64_R_INFO (indx, R_PPC64_DTPREL64);
10270 }
10271 }
10272 else if (tls_type == (TLS_TLS | TLS_DTPREL))
10273 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64);
10274 else if (tls_type == (TLS_TLS | TLS_TPREL))
10275 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64);
10276 else if (indx == 0)
10277 {
10278 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_RELATIVE);
10279
10280 /* Write the .got section contents for the sake
10281 of prelink. */
10282 loc = got->contents + off;
10283 bfd_put_64 (output_bfd, outrel.r_addend + relocation,
10284 loc);
10285 }
10286 else
10287 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT);
10288
10289 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD))
10290 {
10291 outrel.r_addend += relocation;
10292 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL))
10293 outrel.r_addend -= htab->elf.tls_sec->vma;
10294 }
10295 loc = relgot->contents;
10296 loc += (relgot->reloc_count++
10297 * sizeof (Elf64_External_Rela));
10298 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
10299 }
10300
10301 /* Init the .got section contents here if we're not
10302 emitting a reloc. */
10303 else
10304 {
10305 relocation += rel->r_addend;
10306 if (tls_type == (TLS_TLS | TLS_LD))
10307 relocation = 1;
10308 else if (tls_type != 0)
10309 {
10310 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET;
10311 if (tls_type == (TLS_TLS | TLS_TPREL))
10312 relocation += DTP_OFFSET - TP_OFFSET;
10313
10314 if (tls_type == (TLS_TLS | TLS_GD))
10315 {
10316 bfd_put_64 (output_bfd, relocation,
10317 got->contents + off + 8);
10318 relocation = 1;
10319 }
10320 }
10321
10322 bfd_put_64 (output_bfd, relocation,
10323 got->contents + off);
10324 }
10325 }
10326
10327 if (off >= (bfd_vma) -2)
10328 abort ();
10329
10330 relocation = got->output_offset + off;
10331
10332 /* TOC base (r2) is TOC start plus 0x8000. */
10333 addend = -TOC_BASE_OFF;
10334 }
10335 break;
10336
10337 case R_PPC64_PLT16_HA:
10338 case R_PPC64_PLT16_HI:
10339 case R_PPC64_PLT16_LO:
10340 case R_PPC64_PLT32:
10341 case R_PPC64_PLT64:
10342 /* Relocation is to the entry for this symbol in the
10343 procedure linkage table. */
10344
10345 /* Resolve a PLT reloc against a local symbol directly,
10346 without using the procedure linkage table. */
10347 if (h == NULL)
10348 break;
10349
10350 /* It's possible that we didn't make a PLT entry for this
10351 symbol. This happens when statically linking PIC code,
10352 or when using -Bsymbolic. Go find a match if there is a
10353 PLT entry. */
10354 if (htab->plt != NULL)
10355 {
10356 struct plt_entry *ent;
10357 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next)
10358 if (ent->addend == rel->r_addend
10359 && ent->plt.offset != (bfd_vma) -1)
10360 {
10361 relocation = (htab->plt->output_section->vma
10362 + htab->plt->output_offset
10363 + ent->plt.offset);
10364 unresolved_reloc = FALSE;
10365 }
10366 }
10367 break;
10368
10369 case R_PPC64_TOC:
10370 /* Relocation value is TOC base. */
10371 relocation = TOCstart;
10372 if (r_symndx == 0)
10373 relocation += htab->stub_group[input_section->id].toc_off;
10374 else if (unresolved_reloc)
10375 ;
10376 else if (sec != NULL && sec->id <= htab->top_id)
10377 relocation += htab->stub_group[sec->id].toc_off;
10378 else
10379 unresolved_reloc = TRUE;
10380 goto dodyn2;
10381
10382 /* TOC16 relocs. We want the offset relative to the TOC base,
10383 which is the address of the start of the TOC plus 0x8000.
10384 The TOC consists of sections .got, .toc, .tocbss, and .plt,
10385 in this order. */
10386 case R_PPC64_TOC16:
10387 case R_PPC64_TOC16_LO:
10388 case R_PPC64_TOC16_HI:
10389 case R_PPC64_TOC16_DS:
10390 case R_PPC64_TOC16_LO_DS:
10391 case R_PPC64_TOC16_HA:
10392 addend -= TOCstart + htab->stub_group[input_section->id].toc_off;
10393 break;
10394
10395 /* Relocate against the beginning of the section. */
10396 case R_PPC64_SECTOFF:
10397 case R_PPC64_SECTOFF_LO:
10398 case R_PPC64_SECTOFF_HI:
10399 case R_PPC64_SECTOFF_DS:
10400 case R_PPC64_SECTOFF_LO_DS:
10401 case R_PPC64_SECTOFF_HA:
10402 if (sec != NULL)
10403 addend -= sec->output_section->vma;
10404 break;
10405
10406 case R_PPC64_REL14:
10407 case R_PPC64_REL14_BRNTAKEN:
10408 case R_PPC64_REL14_BRTAKEN:
10409 case R_PPC64_REL24:
10410 break;
10411
10412 case R_PPC64_TPREL16:
10413 case R_PPC64_TPREL16_LO:
10414 case R_PPC64_TPREL16_HI:
10415 case R_PPC64_TPREL16_HA:
10416 case R_PPC64_TPREL16_DS:
10417 case R_PPC64_TPREL16_LO_DS:
10418 case R_PPC64_TPREL16_HIGHER:
10419 case R_PPC64_TPREL16_HIGHERA:
10420 case R_PPC64_TPREL16_HIGHEST:
10421 case R_PPC64_TPREL16_HIGHESTA:
10422 addend -= htab->elf.tls_sec->vma + TP_OFFSET;
10423 if (info->shared)
10424 /* The TPREL16 relocs shouldn't really be used in shared
10425 libs as they will result in DT_TEXTREL being set, but
10426 support them anyway. */
10427 goto dodyn;
10428 break;
10429
10430 case R_PPC64_DTPREL16:
10431 case R_PPC64_DTPREL16_LO:
10432 case R_PPC64_DTPREL16_HI:
10433 case R_PPC64_DTPREL16_HA:
10434 case R_PPC64_DTPREL16_DS:
10435 case R_PPC64_DTPREL16_LO_DS:
10436 case R_PPC64_DTPREL16_HIGHER:
10437 case R_PPC64_DTPREL16_HIGHERA:
10438 case R_PPC64_DTPREL16_HIGHEST:
10439 case R_PPC64_DTPREL16_HIGHESTA:
10440 addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
10441 break;
10442
10443 case R_PPC64_DTPMOD64:
10444 relocation = 1;
10445 addend = 0;
10446 goto dodyn;
10447
10448 case R_PPC64_TPREL64:
10449 addend -= htab->elf.tls_sec->vma + TP_OFFSET;
10450 goto dodyn;
10451
10452 case R_PPC64_DTPREL64:
10453 addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
10454 /* Fall thru */
10455
10456 /* Relocations that may need to be propagated if this is a
10457 dynamic object. */
10458 case R_PPC64_REL30:
10459 case R_PPC64_REL32:
10460 case R_PPC64_REL64:
10461 case R_PPC64_ADDR14:
10462 case R_PPC64_ADDR14_BRNTAKEN:
10463 case R_PPC64_ADDR14_BRTAKEN:
10464 case R_PPC64_ADDR16:
10465 case R_PPC64_ADDR16_DS:
10466 case R_PPC64_ADDR16_HA:
10467 case R_PPC64_ADDR16_HI:
10468 case R_PPC64_ADDR16_HIGHER:
10469 case R_PPC64_ADDR16_HIGHERA:
10470 case R_PPC64_ADDR16_HIGHEST:
10471 case R_PPC64_ADDR16_HIGHESTA:
10472 case R_PPC64_ADDR16_LO:
10473 case R_PPC64_ADDR16_LO_DS:
10474 case R_PPC64_ADDR24:
10475 case R_PPC64_ADDR32:
10476 case R_PPC64_ADDR64:
10477 case R_PPC64_UADDR16:
10478 case R_PPC64_UADDR32:
10479 case R_PPC64_UADDR64:
10480 /* r_symndx will be zero only for relocs against symbols
10481 from removed linkonce sections, or sections discarded by
10482 a linker script. */
10483 dodyn:
10484 if (r_symndx == 0)
10485 break;
10486 /* Fall thru. */
10487
10488 dodyn2:
10489 if ((input_section->flags & SEC_ALLOC) == 0)
10490 break;
10491
10492 if (NO_OPD_RELOCS && is_opd)
10493 break;
10494
10495 if ((info->shared
10496 && (h == NULL
10497 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT
10498 || h->elf.root.type != bfd_link_hash_undefweak)
10499 && (MUST_BE_DYN_RELOC (r_type)
10500 || !SYMBOL_CALLS_LOCAL (info, &h->elf)))
10501 || (ELIMINATE_COPY_RELOCS
10502 && !info->shared
10503 && h != NULL
10504 && h->elf.dynindx != -1
10505 && !h->elf.non_got_ref
10506 && h->elf.def_dynamic
10507 && !h->elf.def_regular))
10508 {
10509 Elf_Internal_Rela outrel;
10510 bfd_boolean skip, relocate;
10511 asection *sreloc;
10512 bfd_byte *loc;
10513 bfd_vma out_off;
10514
10515 /* When generating a dynamic object, these relocations
10516 are copied into the output file to be resolved at run
10517 time. */
10518
10519 skip = FALSE;
10520 relocate = FALSE;
10521
10522 out_off = _bfd_elf_section_offset (output_bfd, info,
10523 input_section, rel->r_offset);
10524 if (out_off == (bfd_vma) -1)
10525 skip = TRUE;
10526 else if (out_off == (bfd_vma) -2)
10527 skip = TRUE, relocate = TRUE;
10528 out_off += (input_section->output_section->vma
10529 + input_section->output_offset);
10530 outrel.r_offset = out_off;
10531 outrel.r_addend = rel->r_addend;
10532
10533 /* Optimize unaligned reloc use. */
10534 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0)
10535 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0))
10536 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64;
10537 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0)
10538 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0))
10539 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32;
10540 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0)
10541 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0))
10542 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16;
10543
10544 if (skip)
10545 memset (&outrel, 0, sizeof outrel);
10546 else if (!SYMBOL_REFERENCES_LOCAL (info, &h->elf)
10547 && !is_opd
10548 && r_type != R_PPC64_TOC)
10549 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type);
10550 else
10551 {
10552 /* This symbol is local, or marked to become local,
10553 or this is an opd section reloc which must point
10554 at a local function. */
10555 outrel.r_addend += relocation;
10556 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC)
10557 {
10558 if (is_opd && h != NULL)
10559 {
10560 /* Lie about opd entries. This case occurs
10561 when building shared libraries and we
10562 reference a function in another shared
10563 lib. The same thing happens for a weak
10564 definition in an application that's
10565 overridden by a strong definition in a
10566 shared lib. (I believe this is a generic
10567 bug in binutils handling of weak syms.)
10568 In these cases we won't use the opd
10569 entry in this lib. */
10570 unresolved_reloc = FALSE;
10571 }
10572 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE);
10573
10574 /* We need to relocate .opd contents for ld.so.
10575 Prelink also wants simple and consistent rules
10576 for relocs. This make all RELATIVE relocs have
10577 *r_offset equal to r_addend. */
10578 relocate = TRUE;
10579 }
10580 else
10581 {
10582 long indx = 0;
10583
10584 if (bfd_is_abs_section (sec))
10585 ;
10586 else if (sec == NULL || sec->owner == NULL)
10587 {
10588 bfd_set_error (bfd_error_bad_value);
10589 return FALSE;
10590 }
10591 else
10592 {
10593 asection *osec;
10594
10595 osec = sec->output_section;
10596 indx = elf_section_data (osec)->dynindx;
10597
10598 /* We are turning this relocation into one
10599 against a section symbol, so subtract out
10600 the output section's address but not the
10601 offset of the input section in the output
10602 section. */
10603 outrel.r_addend -= osec->vma;
10604 }
10605
10606 outrel.r_info = ELF64_R_INFO (indx, r_type);
10607 }
10608 }
10609
10610 sreloc = elf_section_data (input_section)->sreloc;
10611 if (sreloc == NULL)
10612 abort ();
10613
10614 loc = sreloc->contents;
10615 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
10616 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
10617
10618 /* If this reloc is against an external symbol, it will
10619 be computed at runtime, so there's no need to do
10620 anything now. However, for the sake of prelink ensure
10621 that the section contents are a known value. */
10622 if (! relocate)
10623 {
10624 unresolved_reloc = FALSE;
10625 /* The value chosen here is quite arbitrary as ld.so
10626 ignores section contents except for the special
10627 case of .opd where the contents might be accessed
10628 before relocation. Choose zero, as that won't
10629 cause reloc overflow. */
10630 relocation = 0;
10631 addend = 0;
10632 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs
10633 to improve backward compatibility with older
10634 versions of ld. */
10635 if (r_type == R_PPC64_ADDR64)
10636 addend = outrel.r_addend;
10637 /* Adjust pc_relative relocs to have zero in *r_offset. */
10638 else if (ppc64_elf_howto_table[r_type]->pc_relative)
10639 addend = (input_section->output_section->vma
10640 + input_section->output_offset
10641 + rel->r_offset);
10642 }
10643 }
10644 break;
10645
10646 case R_PPC64_COPY:
10647 case R_PPC64_GLOB_DAT:
10648 case R_PPC64_JMP_SLOT:
10649 case R_PPC64_RELATIVE:
10650 /* We shouldn't ever see these dynamic relocs in relocatable
10651 files. */
10652 /* Fall through. */
10653
10654 case R_PPC64_PLTGOT16:
10655 case R_PPC64_PLTGOT16_DS:
10656 case R_PPC64_PLTGOT16_HA:
10657 case R_PPC64_PLTGOT16_HI:
10658 case R_PPC64_PLTGOT16_LO:
10659 case R_PPC64_PLTGOT16_LO_DS:
10660 case R_PPC64_PLTREL32:
10661 case R_PPC64_PLTREL64:
10662 /* These ones haven't been implemented yet. */
10663
10664 (*_bfd_error_handler)
10665 (_("%B: relocation %s is not supported for symbol %s."),
10666 input_bfd,
10667 ppc64_elf_howto_table[r_type]->name, sym_name);
10668
10669 bfd_set_error (bfd_error_invalid_operation);
10670 ret = FALSE;
10671 continue;
10672 }
10673
10674 /* Do any further special processing. */
10675 switch (r_type)
10676 {
10677 default:
10678 break;
10679
10680 case R_PPC64_ADDR16_HA:
10681 case R_PPC64_ADDR16_HIGHERA:
10682 case R_PPC64_ADDR16_HIGHESTA:
10683 case R_PPC64_GOT16_HA:
10684 case R_PPC64_PLTGOT16_HA:
10685 case R_PPC64_PLT16_HA:
10686 case R_PPC64_TOC16_HA:
10687 case R_PPC64_SECTOFF_HA:
10688 case R_PPC64_TPREL16_HA:
10689 case R_PPC64_DTPREL16_HA:
10690 case R_PPC64_GOT_TLSGD16_HA:
10691 case R_PPC64_GOT_TLSLD16_HA:
10692 case R_PPC64_GOT_TPREL16_HA:
10693 case R_PPC64_GOT_DTPREL16_HA:
10694 case R_PPC64_TPREL16_HIGHER:
10695 case R_PPC64_TPREL16_HIGHERA:
10696 case R_PPC64_TPREL16_HIGHEST:
10697 case R_PPC64_TPREL16_HIGHESTA:
10698 case R_PPC64_DTPREL16_HIGHER:
10699 case R_PPC64_DTPREL16_HIGHERA:
10700 case R_PPC64_DTPREL16_HIGHEST:
10701 case R_PPC64_DTPREL16_HIGHESTA:
10702 /* It's just possible that this symbol is a weak symbol
10703 that's not actually defined anywhere. In that case,
10704 'sec' would be NULL, and we should leave the symbol
10705 alone (it will be set to zero elsewhere in the link). */
10706 if (sec != NULL)
10707 /* Add 0x10000 if sign bit in 0:15 is set.
10708 Bits 0:15 are not used. */
10709 addend += 0x8000;
10710 break;
10711
10712 case R_PPC64_ADDR16_DS:
10713 case R_PPC64_ADDR16_LO_DS:
10714 case R_PPC64_GOT16_DS:
10715 case R_PPC64_GOT16_LO_DS:
10716 case R_PPC64_PLT16_LO_DS:
10717 case R_PPC64_SECTOFF_DS:
10718 case R_PPC64_SECTOFF_LO_DS:
10719 case R_PPC64_TOC16_DS:
10720 case R_PPC64_TOC16_LO_DS:
10721 case R_PPC64_PLTGOT16_DS:
10722 case R_PPC64_PLTGOT16_LO_DS:
10723 case R_PPC64_GOT_TPREL16_DS:
10724 case R_PPC64_GOT_TPREL16_LO_DS:
10725 case R_PPC64_GOT_DTPREL16_DS:
10726 case R_PPC64_GOT_DTPREL16_LO_DS:
10727 case R_PPC64_TPREL16_DS:
10728 case R_PPC64_TPREL16_LO_DS:
10729 case R_PPC64_DTPREL16_DS:
10730 case R_PPC64_DTPREL16_LO_DS:
10731 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3));
10732 mask = 3;
10733 /* If this reloc is against an lq insn, then the value must be
10734 a multiple of 16. This is somewhat of a hack, but the
10735 "correct" way to do this by defining _DQ forms of all the
10736 _DS relocs bloats all reloc switches in this file. It
10737 doesn't seem to make much sense to use any of these relocs
10738 in data, so testing the insn should be safe. */
10739 if ((insn & (0x3f << 26)) == (56u << 26))
10740 mask = 15;
10741 if (((relocation + addend) & mask) != 0)
10742 {
10743 (*_bfd_error_handler)
10744 (_("%B: error: relocation %s not a multiple of %d"),
10745 input_bfd,
10746 ppc64_elf_howto_table[r_type]->name,
10747 mask + 1);
10748 bfd_set_error (bfd_error_bad_value);
10749 ret = FALSE;
10750 continue;
10751 }
10752 break;
10753 }
10754
10755 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
10756 because such sections are not SEC_ALLOC and thus ld.so will
10757 not process them. */
10758 if (unresolved_reloc
10759 && !((input_section->flags & SEC_DEBUGGING) != 0
10760 && h->elf.def_dynamic))
10761 {
10762 (*_bfd_error_handler)
10763 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
10764 input_bfd,
10765 input_section,
10766 (long) rel->r_offset,
10767 ppc64_elf_howto_table[(int) r_type]->name,
10768 h->elf.root.root.string);
10769 ret = FALSE;
10770 }
10771
10772 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type],
10773 input_bfd,
10774 input_section,
10775 contents,
10776 rel->r_offset,
10777 relocation,
10778 addend);
10779
10780 if (r != bfd_reloc_ok)
10781 {
10782 if (sym_name == NULL)
10783 sym_name = "(null)";
10784 if (r == bfd_reloc_overflow)
10785 {
10786 if (warned)
10787 continue;
10788 if (h != NULL
10789 && h->elf.root.type == bfd_link_hash_undefweak
10790 && ppc64_elf_howto_table[r_type]->pc_relative)
10791 {
10792 /* Assume this is a call protected by other code that
10793 detects the symbol is undefined. If this is the case,
10794 we can safely ignore the overflow. If not, the
10795 program is hosed anyway, and a little warning isn't
10796 going to help. */
10797
10798 continue;
10799 }
10800
10801 if (!((*info->callbacks->reloc_overflow)
10802 (info, (h ? &h->elf.root : NULL), sym_name,
10803 ppc64_elf_howto_table[r_type]->name,
10804 rel->r_addend, input_bfd, input_section, rel->r_offset)))
10805 return FALSE;
10806 }
10807 else
10808 {
10809 (*_bfd_error_handler)
10810 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"),
10811 input_bfd,
10812 input_section,
10813 (long) rel->r_offset,
10814 ppc64_elf_howto_table[r_type]->name,
10815 sym_name,
10816 (int) r);
10817 ret = FALSE;
10818 }
10819 }
10820 }
10821
10822 /* If we're emitting relocations, then shortly after this function
10823 returns, reloc offsets and addends for this section will be
10824 adjusted. Worse, reloc symbol indices will be for the output
10825 file rather than the input. Save a copy of the relocs for
10826 opd_entry_value. */
10827 if (is_opd && info->emitrelocations)
10828 {
10829 bfd_size_type amt;
10830 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela);
10831 rel = bfd_alloc (input_bfd, amt);
10832 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL);
10833 ppc64_elf_tdata (input_bfd)->opd_relocs = rel;
10834 if (rel == NULL)
10835 return FALSE;
10836 memcpy (rel, relocs, amt);
10837 }
10838 return ret;
10839 }
10840
10841 /* Adjust the value of any local symbols in opd sections. */
10842
10843 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)10844 ppc64_elf_output_symbol_hook (struct bfd_link_info *info,
10845 const char *name ATTRIBUTE_UNUSED,
10846 Elf_Internal_Sym *elfsym,
10847 asection *input_sec,
10848 struct elf_link_hash_entry *h)
10849 {
10850 long *opd_adjust, adjust;
10851 bfd_vma value;
10852
10853 if (h != NULL)
10854 return TRUE;
10855
10856 opd_adjust = get_opd_info (input_sec);
10857 if (opd_adjust == NULL)
10858 return TRUE;
10859
10860 value = elfsym->st_value - input_sec->output_offset;
10861 if (!info->relocatable)
10862 value -= input_sec->output_section->vma;
10863
10864 adjust = opd_adjust[value / 8];
10865 if (adjust == -1)
10866 elfsym->st_value = 0;
10867 else
10868 elfsym->st_value += adjust;
10869 return TRUE;
10870 }
10871
10872 /* Finish up dynamic symbol handling. We set the contents of various
10873 dynamic sections here. */
10874
10875 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)10876 ppc64_elf_finish_dynamic_symbol (bfd *output_bfd,
10877 struct bfd_link_info *info,
10878 struct elf_link_hash_entry *h,
10879 Elf_Internal_Sym *sym)
10880 {
10881 struct ppc_link_hash_table *htab;
10882 bfd *dynobj;
10883 struct plt_entry *ent;
10884 Elf_Internal_Rela rela;
10885 bfd_byte *loc;
10886
10887 htab = ppc_hash_table (info);
10888 dynobj = htab->elf.dynobj;
10889
10890 for (ent = h->plt.plist; ent != NULL; ent = ent->next)
10891 if (ent->plt.offset != (bfd_vma) -1)
10892 {
10893 /* This symbol has an entry in the procedure linkage
10894 table. Set it up. */
10895
10896 if (htab->plt == NULL
10897 || htab->relplt == NULL
10898 || htab->glink == NULL)
10899 abort ();
10900
10901 /* Create a JMP_SLOT reloc to inform the dynamic linker to
10902 fill in the PLT entry. */
10903 rela.r_offset = (htab->plt->output_section->vma
10904 + htab->plt->output_offset
10905 + ent->plt.offset);
10906 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT);
10907 rela.r_addend = ent->addend;
10908
10909 loc = htab->relplt->contents;
10910 loc += ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
10911 * sizeof (Elf64_External_Rela));
10912 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
10913 }
10914
10915 if (h->needs_copy)
10916 {
10917 Elf_Internal_Rela rela;
10918 bfd_byte *loc;
10919
10920 /* This symbol needs a copy reloc. Set it up. */
10921
10922 if (h->dynindx == -1
10923 || (h->root.type != bfd_link_hash_defined
10924 && h->root.type != bfd_link_hash_defweak)
10925 || htab->relbss == NULL)
10926 abort ();
10927
10928 rela.r_offset = (h->root.u.def.value
10929 + h->root.u.def.section->output_section->vma
10930 + h->root.u.def.section->output_offset);
10931 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY);
10932 rela.r_addend = 0;
10933 loc = htab->relbss->contents;
10934 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela);
10935 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
10936 }
10937
10938 /* Mark some specially defined symbols as absolute. */
10939 if (strcmp (h->root.root.string, "_DYNAMIC") == 0)
10940 sym->st_shndx = SHN_ABS;
10941
10942 return TRUE;
10943 }
10944
10945 /* Used to decide how to sort relocs in an optimal manner for the
10946 dynamic linker, before writing them out. */
10947
10948 static enum elf_reloc_type_class
ppc64_elf_reloc_type_class(const Elf_Internal_Rela * rela)10949 ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela)
10950 {
10951 enum elf_ppc64_reloc_type r_type;
10952
10953 r_type = ELF64_R_TYPE (rela->r_info);
10954 switch (r_type)
10955 {
10956 case R_PPC64_RELATIVE:
10957 return reloc_class_relative;
10958 case R_PPC64_JMP_SLOT:
10959 return reloc_class_plt;
10960 case R_PPC64_COPY:
10961 return reloc_class_copy;
10962 default:
10963 return reloc_class_normal;
10964 }
10965 }
10966
10967 /* Finish up the dynamic sections. */
10968
10969 static bfd_boolean
ppc64_elf_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)10970 ppc64_elf_finish_dynamic_sections (bfd *output_bfd,
10971 struct bfd_link_info *info)
10972 {
10973 struct ppc_link_hash_table *htab;
10974 bfd *dynobj;
10975 asection *sdyn;
10976
10977 htab = ppc_hash_table (info);
10978 dynobj = htab->elf.dynobj;
10979 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
10980
10981 if (htab->elf.dynamic_sections_created)
10982 {
10983 Elf64_External_Dyn *dyncon, *dynconend;
10984
10985 if (sdyn == NULL || htab->got == NULL)
10986 abort ();
10987
10988 dyncon = (Elf64_External_Dyn *) sdyn->contents;
10989 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
10990 for (; dyncon < dynconend; dyncon++)
10991 {
10992 Elf_Internal_Dyn dyn;
10993 asection *s;
10994
10995 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
10996
10997 switch (dyn.d_tag)
10998 {
10999 default:
11000 continue;
11001
11002 case DT_PPC64_GLINK:
11003 s = htab->glink;
11004 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11005 /* We stupidly defined DT_PPC64_GLINK to be the start
11006 of glink rather than the first entry point, which is
11007 what ld.so needs, and now have a bigger stub to
11008 support automatic multiple TOCs. */
11009 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32;
11010 break;
11011
11012 case DT_PPC64_OPD:
11013 s = bfd_get_section_by_name (output_bfd, ".opd");
11014 if (s == NULL)
11015 continue;
11016 dyn.d_un.d_ptr = s->vma;
11017 break;
11018
11019 case DT_PPC64_OPDSZ:
11020 s = bfd_get_section_by_name (output_bfd, ".opd");
11021 if (s == NULL)
11022 continue;
11023 dyn.d_un.d_val = s->size;
11024 break;
11025
11026 case DT_PLTGOT:
11027 s = htab->plt;
11028 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11029 break;
11030
11031 case DT_JMPREL:
11032 s = htab->relplt;
11033 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
11034 break;
11035
11036 case DT_PLTRELSZ:
11037 dyn.d_un.d_val = htab->relplt->size;
11038 break;
11039
11040 case DT_RELASZ:
11041 /* Don't count procedure linkage table relocs in the
11042 overall reloc count. */
11043 s = htab->relplt;
11044 if (s == NULL)
11045 continue;
11046 dyn.d_un.d_val -= s->size;
11047 break;
11048
11049 case DT_RELA:
11050 /* We may not be using the standard ELF linker script.
11051 If .rela.plt is the first .rela section, we adjust
11052 DT_RELA to not include it. */
11053 s = htab->relplt;
11054 if (s == NULL)
11055 continue;
11056 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
11057 continue;
11058 dyn.d_un.d_ptr += s->size;
11059 break;
11060 }
11061
11062 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
11063 }
11064 }
11065
11066 if (htab->got != NULL && htab->got->size != 0)
11067 {
11068 /* Fill in the first entry in the global offset table.
11069 We use it to hold the link-time TOCbase. */
11070 bfd_put_64 (output_bfd,
11071 elf_gp (output_bfd) + TOC_BASE_OFF,
11072 htab->got->contents);
11073
11074 /* Set .got entry size. */
11075 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8;
11076 }
11077
11078 if (htab->plt != NULL && htab->plt->size != 0)
11079 {
11080 /* Set .plt entry size. */
11081 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize
11082 = PLT_ENTRY_SIZE;
11083 }
11084
11085 /* We need to handle writing out multiple GOT sections ourselves,
11086 since we didn't add them to DYNOBJ. We know dynobj is the first
11087 bfd. */
11088 while ((dynobj = dynobj->link_next) != NULL)
11089 {
11090 asection *s;
11091
11092 if (!is_ppc64_elf_target (dynobj->xvec))
11093 continue;
11094
11095 s = ppc64_elf_tdata (dynobj)->got;
11096 if (s != NULL
11097 && s->size != 0
11098 && s->output_section != bfd_abs_section_ptr
11099 && !bfd_set_section_contents (output_bfd, s->output_section,
11100 s->contents, s->output_offset,
11101 s->size))
11102 return FALSE;
11103 s = ppc64_elf_tdata (dynobj)->relgot;
11104 if (s != NULL
11105 && s->size != 0
11106 && s->output_section != bfd_abs_section_ptr
11107 && !bfd_set_section_contents (output_bfd, s->output_section,
11108 s->contents, s->output_offset,
11109 s->size))
11110 return FALSE;
11111 }
11112
11113 return TRUE;
11114 }
11115
11116 #include "elf64-target.h"
11117