1 /* Motorola 68k series support for 32-bit ELF
2 Copyright (C) 1993-2024 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/m68k.h"
27 #include "opcode/m68k.h"
28 #include "cpu-m68k.h"
29 #include "elf32-m68k.h"
30
31 static bool
32 elf_m68k_discard_copies (struct elf_link_hash_entry *, void *);
33
34 static reloc_howto_type howto_table[] =
35 {
36 HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false),
37 HOWTO(R_68K_32, 0, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false),
38 HOWTO(R_68K_16, 0, 2,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false),
39 HOWTO(R_68K_8, 0, 1, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false),
40 HOWTO(R_68K_PC32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true),
41 HOWTO(R_68K_PC16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true),
42 HOWTO(R_68K_PC8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true),
43 HOWTO(R_68K_GOT32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true),
44 HOWTO(R_68K_GOT16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true),
45 HOWTO(R_68K_GOT8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true),
46 HOWTO(R_68K_GOT32O, 0, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false),
47 HOWTO(R_68K_GOT16O, 0, 2,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false),
48 HOWTO(R_68K_GOT8O, 0, 1, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false),
49 HOWTO(R_68K_PLT32, 0, 4,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true),
50 HOWTO(R_68K_PLT16, 0, 2,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true),
51 HOWTO(R_68K_PLT8, 0, 1, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true),
52 HOWTO(R_68K_PLT32O, 0, 4,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false),
53 HOWTO(R_68K_PLT16O, 0, 2,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false),
54 HOWTO(R_68K_PLT8O, 0, 1, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false),
55 HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false),
56 HOWTO(R_68K_GLOB_DAT, 0, 4,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false),
57 HOWTO(R_68K_JMP_SLOT, 0, 4,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false),
58 HOWTO(R_68K_RELATIVE, 0, 4,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false),
59 /* GNU extension to record C++ vtable hierarchy. */
60 HOWTO (R_68K_GNU_VTINHERIT, /* type */
61 0, /* rightshift */
62 4, /* size */
63 0, /* bitsize */
64 false, /* pc_relative */
65 0, /* bitpos */
66 complain_overflow_dont, /* complain_on_overflow */
67 NULL, /* special_function */
68 "R_68K_GNU_VTINHERIT", /* name */
69 false, /* partial_inplace */
70 0, /* src_mask */
71 0, /* dst_mask */
72 false),
73 /* GNU extension to record C++ vtable member usage. */
74 HOWTO (R_68K_GNU_VTENTRY, /* type */
75 0, /* rightshift */
76 4, /* size */
77 0, /* bitsize */
78 false, /* pc_relative */
79 0, /* bitpos */
80 complain_overflow_dont, /* complain_on_overflow */
81 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
82 "R_68K_GNU_VTENTRY", /* name */
83 false, /* partial_inplace */
84 0, /* src_mask */
85 0, /* dst_mask */
86 false),
87
88 /* TLS general dynamic variable reference. */
89 HOWTO (R_68K_TLS_GD32, /* type */
90 0, /* rightshift */
91 4, /* size */
92 32, /* bitsize */
93 false, /* pc_relative */
94 0, /* bitpos */
95 complain_overflow_bitfield, /* complain_on_overflow */
96 bfd_elf_generic_reloc, /* special_function */
97 "R_68K_TLS_GD32", /* name */
98 false, /* partial_inplace */
99 0, /* src_mask */
100 0xffffffff, /* dst_mask */
101 false), /* pcrel_offset */
102
103 HOWTO (R_68K_TLS_GD16, /* type */
104 0, /* rightshift */
105 2, /* size */
106 16, /* bitsize */
107 false, /* pc_relative */
108 0, /* bitpos */
109 complain_overflow_signed, /* complain_on_overflow */
110 bfd_elf_generic_reloc, /* special_function */
111 "R_68K_TLS_GD16", /* name */
112 false, /* partial_inplace */
113 0, /* src_mask */
114 0x0000ffff, /* dst_mask */
115 false), /* pcrel_offset */
116
117 HOWTO (R_68K_TLS_GD8, /* type */
118 0, /* rightshift */
119 1, /* size */
120 8, /* bitsize */
121 false, /* pc_relative */
122 0, /* bitpos */
123 complain_overflow_signed, /* complain_on_overflow */
124 bfd_elf_generic_reloc, /* special_function */
125 "R_68K_TLS_GD8", /* name */
126 false, /* partial_inplace */
127 0, /* src_mask */
128 0x000000ff, /* dst_mask */
129 false), /* pcrel_offset */
130
131 /* TLS local dynamic variable reference. */
132 HOWTO (R_68K_TLS_LDM32, /* type */
133 0, /* rightshift */
134 4, /* size */
135 32, /* bitsize */
136 false, /* pc_relative */
137 0, /* bitpos */
138 complain_overflow_bitfield, /* complain_on_overflow */
139 bfd_elf_generic_reloc, /* special_function */
140 "R_68K_TLS_LDM32", /* name */
141 false, /* partial_inplace */
142 0, /* src_mask */
143 0xffffffff, /* dst_mask */
144 false), /* pcrel_offset */
145
146 HOWTO (R_68K_TLS_LDM16, /* type */
147 0, /* rightshift */
148 2, /* size */
149 16, /* bitsize */
150 false, /* pc_relative */
151 0, /* bitpos */
152 complain_overflow_signed, /* complain_on_overflow */
153 bfd_elf_generic_reloc, /* special_function */
154 "R_68K_TLS_LDM16", /* name */
155 false, /* partial_inplace */
156 0, /* src_mask */
157 0x0000ffff, /* dst_mask */
158 false), /* pcrel_offset */
159
160 HOWTO (R_68K_TLS_LDM8, /* type */
161 0, /* rightshift */
162 1, /* size */
163 8, /* bitsize */
164 false, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_signed, /* complain_on_overflow */
167 bfd_elf_generic_reloc, /* special_function */
168 "R_68K_TLS_LDM8", /* name */
169 false, /* partial_inplace */
170 0, /* src_mask */
171 0x000000ff, /* dst_mask */
172 false), /* pcrel_offset */
173
174 HOWTO (R_68K_TLS_LDO32, /* type */
175 0, /* rightshift */
176 4, /* size */
177 32, /* bitsize */
178 false, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_bitfield, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_68K_TLS_LDO32", /* name */
183 false, /* partial_inplace */
184 0, /* src_mask */
185 0xffffffff, /* dst_mask */
186 false), /* pcrel_offset */
187
188 HOWTO (R_68K_TLS_LDO16, /* type */
189 0, /* rightshift */
190 2, /* size */
191 16, /* bitsize */
192 false, /* pc_relative */
193 0, /* bitpos */
194 complain_overflow_signed, /* complain_on_overflow */
195 bfd_elf_generic_reloc, /* special_function */
196 "R_68K_TLS_LDO16", /* name */
197 false, /* partial_inplace */
198 0, /* src_mask */
199 0x0000ffff, /* dst_mask */
200 false), /* pcrel_offset */
201
202 HOWTO (R_68K_TLS_LDO8, /* type */
203 0, /* rightshift */
204 1, /* size */
205 8, /* bitsize */
206 false, /* pc_relative */
207 0, /* bitpos */
208 complain_overflow_signed, /* complain_on_overflow */
209 bfd_elf_generic_reloc, /* special_function */
210 "R_68K_TLS_LDO8", /* name */
211 false, /* partial_inplace */
212 0, /* src_mask */
213 0x000000ff, /* dst_mask */
214 false), /* pcrel_offset */
215
216 /* TLS initial execution variable reference. */
217 HOWTO (R_68K_TLS_IE32, /* type */
218 0, /* rightshift */
219 4, /* size */
220 32, /* bitsize */
221 false, /* pc_relative */
222 0, /* bitpos */
223 complain_overflow_bitfield, /* complain_on_overflow */
224 bfd_elf_generic_reloc, /* special_function */
225 "R_68K_TLS_IE32", /* name */
226 false, /* partial_inplace */
227 0, /* src_mask */
228 0xffffffff, /* dst_mask */
229 false), /* pcrel_offset */
230
231 HOWTO (R_68K_TLS_IE16, /* type */
232 0, /* rightshift */
233 2, /* size */
234 16, /* bitsize */
235 false, /* pc_relative */
236 0, /* bitpos */
237 complain_overflow_signed, /* complain_on_overflow */
238 bfd_elf_generic_reloc, /* special_function */
239 "R_68K_TLS_IE16", /* name */
240 false, /* partial_inplace */
241 0, /* src_mask */
242 0x0000ffff, /* dst_mask */
243 false), /* pcrel_offset */
244
245 HOWTO (R_68K_TLS_IE8, /* type */
246 0, /* rightshift */
247 1, /* size */
248 8, /* bitsize */
249 false, /* pc_relative */
250 0, /* bitpos */
251 complain_overflow_signed, /* complain_on_overflow */
252 bfd_elf_generic_reloc, /* special_function */
253 "R_68K_TLS_IE8", /* name */
254 false, /* partial_inplace */
255 0, /* src_mask */
256 0x000000ff, /* dst_mask */
257 false), /* pcrel_offset */
258
259 /* TLS local execution variable reference. */
260 HOWTO (R_68K_TLS_LE32, /* type */
261 0, /* rightshift */
262 4, /* size */
263 32, /* bitsize */
264 false, /* pc_relative */
265 0, /* bitpos */
266 complain_overflow_bitfield, /* complain_on_overflow */
267 bfd_elf_generic_reloc, /* special_function */
268 "R_68K_TLS_LE32", /* name */
269 false, /* partial_inplace */
270 0, /* src_mask */
271 0xffffffff, /* dst_mask */
272 false), /* pcrel_offset */
273
274 HOWTO (R_68K_TLS_LE16, /* type */
275 0, /* rightshift */
276 2, /* size */
277 16, /* bitsize */
278 false, /* pc_relative */
279 0, /* bitpos */
280 complain_overflow_signed, /* complain_on_overflow */
281 bfd_elf_generic_reloc, /* special_function */
282 "R_68K_TLS_LE16", /* name */
283 false, /* partial_inplace */
284 0, /* src_mask */
285 0x0000ffff, /* dst_mask */
286 false), /* pcrel_offset */
287
288 HOWTO (R_68K_TLS_LE8, /* type */
289 0, /* rightshift */
290 1, /* size */
291 8, /* bitsize */
292 false, /* pc_relative */
293 0, /* bitpos */
294 complain_overflow_signed, /* complain_on_overflow */
295 bfd_elf_generic_reloc, /* special_function */
296 "R_68K_TLS_LE8", /* name */
297 false, /* partial_inplace */
298 0, /* src_mask */
299 0x000000ff, /* dst_mask */
300 false), /* pcrel_offset */
301
302 /* TLS GD/LD dynamic relocations. */
303 HOWTO (R_68K_TLS_DTPMOD32, /* type */
304 0, /* rightshift */
305 4, /* size */
306 32, /* bitsize */
307 false, /* pc_relative */
308 0, /* bitpos */
309 complain_overflow_dont, /* complain_on_overflow */
310 bfd_elf_generic_reloc, /* special_function */
311 "R_68K_TLS_DTPMOD32", /* name */
312 false, /* partial_inplace */
313 0, /* src_mask */
314 0xffffffff, /* dst_mask */
315 false), /* pcrel_offset */
316
317 HOWTO (R_68K_TLS_DTPREL32, /* type */
318 0, /* rightshift */
319 4, /* size */
320 32, /* bitsize */
321 false, /* pc_relative */
322 0, /* bitpos */
323 complain_overflow_dont, /* complain_on_overflow */
324 bfd_elf_generic_reloc, /* special_function */
325 "R_68K_TLS_DTPREL32", /* name */
326 false, /* partial_inplace */
327 0, /* src_mask */
328 0xffffffff, /* dst_mask */
329 false), /* pcrel_offset */
330
331 HOWTO (R_68K_TLS_TPREL32, /* type */
332 0, /* rightshift */
333 4, /* size */
334 32, /* bitsize */
335 false, /* pc_relative */
336 0, /* bitpos */
337 complain_overflow_dont, /* complain_on_overflow */
338 bfd_elf_generic_reloc, /* special_function */
339 "R_68K_TLS_TPREL32", /* name */
340 false, /* partial_inplace */
341 0, /* src_mask */
342 0xffffffff, /* dst_mask */
343 false), /* pcrel_offset */
344 };
345
346 static bool
rtype_to_howto(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)347 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
348 {
349 unsigned int indx = ELF32_R_TYPE (dst->r_info);
350
351 if (indx >= (unsigned int) R_68K_max)
352 {
353 /* xgettext:c-format */
354 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
355 abfd, indx);
356 bfd_set_error (bfd_error_bad_value);
357 return false;
358 }
359 cache_ptr->howto = &howto_table[indx];
360 return true;
361 }
362
363 #define elf_info_to_howto rtype_to_howto
364
365 static const struct
366 {
367 bfd_reloc_code_real_type bfd_val;
368 int elf_val;
369 }
370 reloc_map[] =
371 {
372 { BFD_RELOC_NONE, R_68K_NONE },
373 { BFD_RELOC_32, R_68K_32 },
374 { BFD_RELOC_16, R_68K_16 },
375 { BFD_RELOC_8, R_68K_8 },
376 { BFD_RELOC_32_PCREL, R_68K_PC32 },
377 { BFD_RELOC_16_PCREL, R_68K_PC16 },
378 { BFD_RELOC_8_PCREL, R_68K_PC8 },
379 { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
380 { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
381 { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
382 { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
383 { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
384 { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
385 { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
386 { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
387 { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
388 { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
389 { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
390 { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
391 { BFD_RELOC_NONE, R_68K_COPY },
392 { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
393 { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
394 { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
395 { BFD_RELOC_CTOR, R_68K_32 },
396 { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT },
397 { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY },
398 { BFD_RELOC_68K_TLS_GD32, R_68K_TLS_GD32 },
399 { BFD_RELOC_68K_TLS_GD16, R_68K_TLS_GD16 },
400 { BFD_RELOC_68K_TLS_GD8, R_68K_TLS_GD8 },
401 { BFD_RELOC_68K_TLS_LDM32, R_68K_TLS_LDM32 },
402 { BFD_RELOC_68K_TLS_LDM16, R_68K_TLS_LDM16 },
403 { BFD_RELOC_68K_TLS_LDM8, R_68K_TLS_LDM8 },
404 { BFD_RELOC_68K_TLS_LDO32, R_68K_TLS_LDO32 },
405 { BFD_RELOC_68K_TLS_LDO16, R_68K_TLS_LDO16 },
406 { BFD_RELOC_68K_TLS_LDO8, R_68K_TLS_LDO8 },
407 { BFD_RELOC_68K_TLS_IE32, R_68K_TLS_IE32 },
408 { BFD_RELOC_68K_TLS_IE16, R_68K_TLS_IE16 },
409 { BFD_RELOC_68K_TLS_IE8, R_68K_TLS_IE8 },
410 { BFD_RELOC_68K_TLS_LE32, R_68K_TLS_LE32 },
411 { BFD_RELOC_68K_TLS_LE16, R_68K_TLS_LE16 },
412 { BFD_RELOC_68K_TLS_LE8, R_68K_TLS_LE8 },
413 };
414
415 static reloc_howto_type *
reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)416 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
417 bfd_reloc_code_real_type code)
418 {
419 unsigned int i;
420 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
421 {
422 if (reloc_map[i].bfd_val == code)
423 return &howto_table[reloc_map[i].elf_val];
424 }
425 return 0;
426 }
427
428 static reloc_howto_type *
reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)429 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
430 {
431 unsigned int i;
432
433 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
434 if (howto_table[i].name != NULL
435 && strcasecmp (howto_table[i].name, r_name) == 0)
436 return &howto_table[i];
437
438 return NULL;
439 }
440
441 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
442 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
443 #define ELF_ARCH bfd_arch_m68k
444 #define ELF_TARGET_ID M68K_ELF_DATA
445
446 /* Functions for the m68k ELF linker. */
447
448 /* The name of the dynamic interpreter. This is put in the .interp
449 section. */
450
451 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
452
453 /* Describes one of the various PLT styles. */
454
455 struct elf_m68k_plt_info
456 {
457 /* The size of each PLT entry. */
458 bfd_vma size;
459
460 /* The template for the first PLT entry. */
461 const bfd_byte *plt0_entry;
462
463 /* Offsets of fields in PLT0_ENTRY that require R_68K_PC32 relocations.
464 The comments by each member indicate the value that the relocation
465 is against. */
466 struct {
467 unsigned int got4; /* .got + 4 */
468 unsigned int got8; /* .got + 8 */
469 } plt0_relocs;
470
471 /* The template for a symbol's PLT entry. */
472 const bfd_byte *symbol_entry;
473
474 /* Offsets of fields in SYMBOL_ENTRY that require R_68K_PC32 relocations.
475 The comments by each member indicate the value that the relocation
476 is against. */
477 struct {
478 unsigned int got; /* the symbol's .got.plt entry */
479 unsigned int plt; /* .plt */
480 } symbol_relocs;
481
482 /* The offset of the resolver stub from the start of SYMBOL_ENTRY.
483 The stub starts with "move.l #relocoffset,%d0". */
484 bfd_vma symbol_resolve_entry;
485 };
486
487 /* The size in bytes of an entry in the procedure linkage table. */
488
489 #define PLT_ENTRY_SIZE 20
490
491 /* The first entry in a procedure linkage table looks like this. See
492 the SVR4 ABI m68k supplement to see how this works. */
493
494 static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
495 {
496 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
497 0, 0, 0, 2, /* + (.got + 4) - . */
498 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
499 0, 0, 0, 2, /* + (.got + 8) - . */
500 0, 0, 0, 0 /* pad out to 20 bytes. */
501 };
502
503 /* Subsequent entries in a procedure linkage table look like this. */
504
505 static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
506 {
507 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
508 0, 0, 0, 2, /* + (.got.plt entry) - . */
509 0x2f, 0x3c, /* move.l #offset,-(%sp) */
510 0, 0, 0, 0, /* + reloc index */
511 0x60, 0xff, /* bra.l .plt */
512 0, 0, 0, 0 /* + .plt - . */
513 };
514
515 static const struct elf_m68k_plt_info elf_m68k_plt_info =
516 {
517 PLT_ENTRY_SIZE,
518 elf_m68k_plt0_entry, { 4, 12 },
519 elf_m68k_plt_entry, { 4, 16 }, 8
520 };
521
522 #define ISAB_PLT_ENTRY_SIZE 24
523
524 static const bfd_byte elf_isab_plt0_entry[ISAB_PLT_ENTRY_SIZE] =
525 {
526 0x20, 0x3c, /* move.l #offset,%d0 */
527 0, 0, 0, 0, /* + (.got + 4) - . */
528 0x2f, 0x3b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),-(%sp) */
529 0x20, 0x3c, /* move.l #offset,%d0 */
530 0, 0, 0, 0, /* + (.got + 8) - . */
531 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */
532 0x4e, 0xd0, /* jmp (%a0) */
533 0x4e, 0x71 /* nop */
534 };
535
536 /* Subsequent entries in a procedure linkage table look like this. */
537
538 static const bfd_byte elf_isab_plt_entry[ISAB_PLT_ENTRY_SIZE] =
539 {
540 0x20, 0x3c, /* move.l #offset,%d0 */
541 0, 0, 0, 0, /* + (.got.plt entry) - . */
542 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */
543 0x4e, 0xd0, /* jmp (%a0) */
544 0x2f, 0x3c, /* move.l #offset,-(%sp) */
545 0, 0, 0, 0, /* + reloc index */
546 0x60, 0xff, /* bra.l .plt */
547 0, 0, 0, 0 /* + .plt - . */
548 };
549
550 static const struct elf_m68k_plt_info elf_isab_plt_info =
551 {
552 ISAB_PLT_ENTRY_SIZE,
553 elf_isab_plt0_entry, { 2, 12 },
554 elf_isab_plt_entry, { 2, 20 }, 12
555 };
556
557 #define ISAC_PLT_ENTRY_SIZE 24
558
559 static const bfd_byte elf_isac_plt0_entry[ISAC_PLT_ENTRY_SIZE] =
560 {
561 0x20, 0x3c, /* move.l #offset,%d0 */
562 0, 0, 0, 0, /* replaced with .got + 4 - . */
563 0x2e, 0xbb, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l),(%sp) */
564 0x20, 0x3c, /* move.l #offset,%d0 */
565 0, 0, 0, 0, /* replaced with .got + 8 - . */
566 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */
567 0x4e, 0xd0, /* jmp (%a0) */
568 0x4e, 0x71 /* nop */
569 };
570
571 /* Subsequent entries in a procedure linkage table look like this. */
572
573 static const bfd_byte elf_isac_plt_entry[ISAC_PLT_ENTRY_SIZE] =
574 {
575 0x20, 0x3c, /* move.l #offset,%d0 */
576 0, 0, 0, 0, /* replaced with (.got entry) - . */
577 0x20, 0x7b, 0x08, 0xfa, /* move.l (-6,%pc,%d0:l), %a0 */
578 0x4e, 0xd0, /* jmp (%a0) */
579 0x2f, 0x3c, /* move.l #offset,-(%sp) */
580 0, 0, 0, 0, /* replaced with offset into relocation table */
581 0x61, 0xff, /* bsr.l .plt */
582 0, 0, 0, 0 /* replaced with .plt - . */
583 };
584
585 static const struct elf_m68k_plt_info elf_isac_plt_info =
586 {
587 ISAC_PLT_ENTRY_SIZE,
588 elf_isac_plt0_entry, { 2, 12},
589 elf_isac_plt_entry, { 2, 20 }, 12
590 };
591
592 #define CPU32_PLT_ENTRY_SIZE 24
593 /* Procedure linkage table entries for the cpu32 */
594 static const bfd_byte elf_cpu32_plt0_entry[CPU32_PLT_ENTRY_SIZE] =
595 {
596 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
597 0, 0, 0, 2, /* + (.got + 4) - . */
598 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
599 0, 0, 0, 2, /* + (.got + 8) - . */
600 0x4e, 0xd1, /* jmp %a1@ */
601 0, 0, 0, 0, /* pad out to 24 bytes. */
602 0, 0
603 };
604
605 static const bfd_byte elf_cpu32_plt_entry[CPU32_PLT_ENTRY_SIZE] =
606 {
607 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */
608 0, 0, 0, 2, /* + (.got.plt entry) - . */
609 0x4e, 0xd1, /* jmp %a1@ */
610 0x2f, 0x3c, /* move.l #offset,-(%sp) */
611 0, 0, 0, 0, /* + reloc index */
612 0x60, 0xff, /* bra.l .plt */
613 0, 0, 0, 0, /* + .plt - . */
614 0, 0
615 };
616
617 static const struct elf_m68k_plt_info elf_cpu32_plt_info =
618 {
619 CPU32_PLT_ENTRY_SIZE,
620 elf_cpu32_plt0_entry, { 4, 12 },
621 elf_cpu32_plt_entry, { 4, 18 }, 10
622 };
623
624 /* The m68k linker needs to keep track of the number of relocs that it
625 decides to copy in check_relocs for each symbol. This is so that it
626 can discard PC relative relocs if it doesn't need them when linking
627 with -Bsymbolic. We store the information in a field extending the
628 regular ELF linker hash table. */
629
630 /* This structure keeps track of the number of PC relative relocs we have
631 copied for a given symbol. */
632
633 struct elf_m68k_pcrel_relocs_copied
634 {
635 /* Next section. */
636 struct elf_m68k_pcrel_relocs_copied *next;
637 /* A section in dynobj. */
638 asection *section;
639 /* Number of relocs copied in this section. */
640 bfd_size_type count;
641 };
642
643 /* Forward declaration. */
644 struct elf_m68k_got_entry;
645
646 /* m68k ELF linker hash entry. */
647
648 struct elf_m68k_link_hash_entry
649 {
650 struct elf_link_hash_entry root;
651
652 /* Number of PC relative relocs copied for this symbol. */
653 struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
654
655 /* Key to got_entries. */
656 unsigned long got_entry_key;
657
658 /* List of GOT entries for this symbol. This list is build during
659 offset finalization and is used within elf_m68k_finish_dynamic_symbol
660 to traverse all GOT entries for a particular symbol.
661
662 ??? We could've used root.got.glist field instead, but having
663 a separate field is cleaner. */
664 struct elf_m68k_got_entry *glist;
665 };
666
667 #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent))
668
669 /* Key part of GOT entry in hashtable. */
670 struct elf_m68k_got_entry_key
671 {
672 /* BFD in which this symbol was defined. NULL for global symbols. */
673 const bfd *bfd;
674
675 /* Symbol index. Either local symbol index or h->got_entry_key. */
676 unsigned long symndx;
677
678 /* Type is one of R_68K_GOT{8, 16, 32}O, R_68K_TLS_GD{8, 16, 32},
679 R_68K_TLS_LDM{8, 16, 32} or R_68K_TLS_IE{8, 16, 32}.
680
681 From perspective of hashtable key, only elf_m68k_got_reloc_type (type)
682 matters. That is, we distinguish between, say, R_68K_GOT16O
683 and R_68K_GOT32O when allocating offsets, but they are considered to be
684 the same when searching got->entries. */
685 enum elf_m68k_reloc_type type;
686 };
687
688 /* Size of the GOT offset suitable for relocation. */
689 enum elf_m68k_got_offset_size { R_8, R_16, R_32, R_LAST };
690
691 /* Entry of the GOT. */
692 struct elf_m68k_got_entry
693 {
694 /* GOT entries are put into a got->entries hashtable. This is the key. */
695 struct elf_m68k_got_entry_key key_;
696
697 /* GOT entry data. We need s1 before offset finalization and s2 after. */
698 union
699 {
700 struct
701 {
702 /* Number of times this entry is referenced. */
703 bfd_vma refcount;
704 } s1;
705
706 struct
707 {
708 /* Offset from the start of .got section. To calculate offset relative
709 to GOT pointer one should subtract got->offset from this value. */
710 bfd_vma offset;
711
712 /* Pointer to the next GOT entry for this global symbol.
713 Symbols have at most one entry in one GOT, but might
714 have entries in more than one GOT.
715 Root of this list is h->glist.
716 NULL for local symbols. */
717 struct elf_m68k_got_entry *next;
718 } s2;
719 } u;
720 };
721
722 /* Return representative type for relocation R_TYPE.
723 This is used to avoid enumerating many relocations in comparisons,
724 switches etc. */
725
726 static enum elf_m68k_reloc_type
elf_m68k_reloc_got_type(enum elf_m68k_reloc_type r_type)727 elf_m68k_reloc_got_type (enum elf_m68k_reloc_type r_type)
728 {
729 switch (r_type)
730 {
731 /* In most cases R_68K_GOTx relocations require the very same
732 handling as R_68K_GOT32O relocation. In cases when we need
733 to distinguish between the two, we use explicitly compare against
734 r_type. */
735 case R_68K_GOT32:
736 case R_68K_GOT16:
737 case R_68K_GOT8:
738 case R_68K_GOT32O:
739 case R_68K_GOT16O:
740 case R_68K_GOT8O:
741 return R_68K_GOT32O;
742
743 case R_68K_TLS_GD32:
744 case R_68K_TLS_GD16:
745 case R_68K_TLS_GD8:
746 return R_68K_TLS_GD32;
747
748 case R_68K_TLS_LDM32:
749 case R_68K_TLS_LDM16:
750 case R_68K_TLS_LDM8:
751 return R_68K_TLS_LDM32;
752
753 case R_68K_TLS_IE32:
754 case R_68K_TLS_IE16:
755 case R_68K_TLS_IE8:
756 return R_68K_TLS_IE32;
757
758 default:
759 BFD_ASSERT (false);
760 return 0;
761 }
762 }
763
764 /* Return size of the GOT entry offset for relocation R_TYPE. */
765
766 static enum elf_m68k_got_offset_size
elf_m68k_reloc_got_offset_size(enum elf_m68k_reloc_type r_type)767 elf_m68k_reloc_got_offset_size (enum elf_m68k_reloc_type r_type)
768 {
769 switch (r_type)
770 {
771 case R_68K_GOT32: case R_68K_GOT16: case R_68K_GOT8:
772 case R_68K_GOT32O: case R_68K_TLS_GD32: case R_68K_TLS_LDM32:
773 case R_68K_TLS_IE32:
774 return R_32;
775
776 case R_68K_GOT16O: case R_68K_TLS_GD16: case R_68K_TLS_LDM16:
777 case R_68K_TLS_IE16:
778 return R_16;
779
780 case R_68K_GOT8O: case R_68K_TLS_GD8: case R_68K_TLS_LDM8:
781 case R_68K_TLS_IE8:
782 return R_8;
783
784 default:
785 BFD_ASSERT (false);
786 return 0;
787 }
788 }
789
790 /* Return number of GOT entries we need to allocate in GOT for
791 relocation R_TYPE. */
792
793 static bfd_vma
elf_m68k_reloc_got_n_slots(enum elf_m68k_reloc_type r_type)794 elf_m68k_reloc_got_n_slots (enum elf_m68k_reloc_type r_type)
795 {
796 switch (elf_m68k_reloc_got_type (r_type))
797 {
798 case R_68K_GOT32O:
799 case R_68K_TLS_IE32:
800 return 1;
801
802 case R_68K_TLS_GD32:
803 case R_68K_TLS_LDM32:
804 return 2;
805
806 default:
807 BFD_ASSERT (false);
808 return 0;
809 }
810 }
811
812 /* Return TRUE if relocation R_TYPE is a TLS one. */
813
814 static bool
elf_m68k_reloc_tls_p(enum elf_m68k_reloc_type r_type)815 elf_m68k_reloc_tls_p (enum elf_m68k_reloc_type r_type)
816 {
817 switch (r_type)
818 {
819 case R_68K_TLS_GD32: case R_68K_TLS_GD16: case R_68K_TLS_GD8:
820 case R_68K_TLS_LDM32: case R_68K_TLS_LDM16: case R_68K_TLS_LDM8:
821 case R_68K_TLS_LDO32: case R_68K_TLS_LDO16: case R_68K_TLS_LDO8:
822 case R_68K_TLS_IE32: case R_68K_TLS_IE16: case R_68K_TLS_IE8:
823 case R_68K_TLS_LE32: case R_68K_TLS_LE16: case R_68K_TLS_LE8:
824 case R_68K_TLS_DTPMOD32: case R_68K_TLS_DTPREL32: case R_68K_TLS_TPREL32:
825 return true;
826
827 default:
828 return false;
829 }
830 }
831
832 /* Data structure representing a single GOT. */
833 struct elf_m68k_got
834 {
835 /* Hashtable of 'struct elf_m68k_got_entry's.
836 Starting size of this table is the maximum number of
837 R_68K_GOT8O entries. */
838 htab_t entries;
839
840 /* Number of R_x slots in this GOT. Some (e.g., TLS) entries require
841 several GOT slots.
842
843 n_slots[R_8] is the count of R_8 slots in this GOT.
844 n_slots[R_16] is the cumulative count of R_8 and R_16 slots
845 in this GOT.
846 n_slots[R_32] is the cumulative count of R_8, R_16 and R_32 slots
847 in this GOT. This is the total number of slots. */
848 bfd_vma n_slots[R_LAST];
849
850 /* Number of local (entry->key_.h == NULL) slots in this GOT.
851 This is only used to properly calculate size of .rela.got section;
852 see elf_m68k_partition_multi_got. */
853 bfd_vma local_n_slots;
854
855 /* Offset of this GOT relative to beginning of .got section. */
856 bfd_vma offset;
857 };
858
859 /* BFD and its GOT. This is an entry in multi_got->bfd2got hashtable. */
860 struct elf_m68k_bfd2got_entry
861 {
862 /* BFD. */
863 const bfd *bfd;
864
865 /* Assigned GOT. Before partitioning multi-GOT each BFD has its own
866 GOT structure. After partitioning several BFD's might [and often do]
867 share a single GOT. */
868 struct elf_m68k_got *got;
869 };
870
871 /* The main data structure holding all the pieces. */
872 struct elf_m68k_multi_got
873 {
874 /* Hashtable mapping each BFD to its GOT. If a BFD doesn't have an entry
875 here, then it doesn't need a GOT (this includes the case of a BFD
876 having an empty GOT).
877
878 ??? This hashtable can be replaced by an array indexed by bfd->id. */
879 htab_t bfd2got;
880
881 /* Next symndx to assign a global symbol.
882 h->got_entry_key is initialized from this counter. */
883 unsigned long global_symndx;
884 };
885
886 /* m68k ELF linker hash table. */
887
888 struct elf_m68k_link_hash_table
889 {
890 struct elf_link_hash_table root;
891
892 /* The PLT format used by this link, or NULL if the format has not
893 yet been chosen. */
894 const struct elf_m68k_plt_info *plt_info;
895
896 /* True, if GP is loaded within each function which uses it.
897 Set to TRUE when GOT negative offsets or multi-GOT is enabled. */
898 bool local_gp_p;
899
900 /* Switch controlling use of negative offsets to double the size of GOTs. */
901 bool use_neg_got_offsets_p;
902
903 /* Switch controlling generation of multiple GOTs. */
904 bool allow_multigot_p;
905
906 /* Multi-GOT data structure. */
907 struct elf_m68k_multi_got multi_got_;
908 };
909
910 /* Get the m68k ELF linker hash table from a link_info structure. */
911
912 #define elf_m68k_hash_table(p) \
913 ((is_elf_hash_table ((p)->hash) \
914 && elf_hash_table_id (elf_hash_table (p)) == M68K_ELF_DATA) \
915 ? (struct elf_m68k_link_hash_table *) (p)->hash : NULL)
916
917 /* Shortcut to multi-GOT data. */
918 #define elf_m68k_multi_got(INFO) (&elf_m68k_hash_table (INFO)->multi_got_)
919
920 /* Create an entry in an m68k ELF linker hash table. */
921
922 static struct bfd_hash_entry *
elf_m68k_link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)923 elf_m68k_link_hash_newfunc (struct bfd_hash_entry *entry,
924 struct bfd_hash_table *table,
925 const char *string)
926 {
927 struct bfd_hash_entry *ret = entry;
928
929 /* Allocate the structure if it has not already been allocated by a
930 subclass. */
931 if (ret == NULL)
932 ret = bfd_hash_allocate (table,
933 sizeof (struct elf_m68k_link_hash_entry));
934 if (ret == NULL)
935 return ret;
936
937 /* Call the allocation method of the superclass. */
938 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
939 if (ret != NULL)
940 {
941 elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL;
942 elf_m68k_hash_entry (ret)->got_entry_key = 0;
943 elf_m68k_hash_entry (ret)->glist = NULL;
944 }
945
946 return ret;
947 }
948
949 /* Destroy an m68k ELF linker hash table. */
950
951 static void
elf_m68k_link_hash_table_free(bfd * obfd)952 elf_m68k_link_hash_table_free (bfd *obfd)
953 {
954 struct elf_m68k_link_hash_table *htab;
955
956 htab = (struct elf_m68k_link_hash_table *) obfd->link.hash;
957
958 if (htab->multi_got_.bfd2got != NULL)
959 {
960 htab_delete (htab->multi_got_.bfd2got);
961 htab->multi_got_.bfd2got = NULL;
962 }
963 _bfd_elf_link_hash_table_free (obfd);
964 }
965
966 /* Create an m68k ELF linker hash table. */
967
968 static struct bfd_link_hash_table *
elf_m68k_link_hash_table_create(bfd * abfd)969 elf_m68k_link_hash_table_create (bfd *abfd)
970 {
971 struct elf_m68k_link_hash_table *ret;
972 size_t amt = sizeof (struct elf_m68k_link_hash_table);
973
974 ret = (struct elf_m68k_link_hash_table *) bfd_zmalloc (amt);
975 if (ret == (struct elf_m68k_link_hash_table *) NULL)
976 return NULL;
977
978 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
979 elf_m68k_link_hash_newfunc,
980 sizeof (struct elf_m68k_link_hash_entry),
981 M68K_ELF_DATA))
982 {
983 free (ret);
984 return NULL;
985 }
986 ret->root.root.hash_table_free = elf_m68k_link_hash_table_free;
987
988 ret->multi_got_.global_symndx = 1;
989
990 return &ret->root.root;
991 }
992
993 /* Set the right machine number. */
994
995 static bool
elf32_m68k_object_p(bfd * abfd)996 elf32_m68k_object_p (bfd *abfd)
997 {
998 unsigned int mach = 0;
999 unsigned features = 0;
1000 flagword eflags = elf_elfheader (abfd)->e_flags;
1001
1002 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000)
1003 features |= m68000;
1004 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)
1005 features |= cpu32;
1006 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO)
1007 features |= fido_a;
1008 else
1009 {
1010 switch (eflags & EF_M68K_CF_ISA_MASK)
1011 {
1012 case EF_M68K_CF_ISA_A_NODIV:
1013 features |= mcfisa_a;
1014 break;
1015 case EF_M68K_CF_ISA_A:
1016 features |= mcfisa_a|mcfhwdiv;
1017 break;
1018 case EF_M68K_CF_ISA_A_PLUS:
1019 features |= mcfisa_a|mcfisa_aa|mcfhwdiv|mcfusp;
1020 break;
1021 case EF_M68K_CF_ISA_B_NOUSP:
1022 features |= mcfisa_a|mcfisa_b|mcfhwdiv;
1023 break;
1024 case EF_M68K_CF_ISA_B:
1025 features |= mcfisa_a|mcfisa_b|mcfhwdiv|mcfusp;
1026 break;
1027 case EF_M68K_CF_ISA_C:
1028 features |= mcfisa_a|mcfisa_c|mcfhwdiv|mcfusp;
1029 break;
1030 case EF_M68K_CF_ISA_C_NODIV:
1031 features |= mcfisa_a|mcfisa_c|mcfusp;
1032 break;
1033 }
1034 switch (eflags & EF_M68K_CF_MAC_MASK)
1035 {
1036 case EF_M68K_CF_MAC:
1037 features |= mcfmac;
1038 break;
1039 case EF_M68K_CF_EMAC:
1040 features |= mcfemac;
1041 break;
1042 }
1043 if (eflags & EF_M68K_CF_FLOAT)
1044 features |= cfloat;
1045 }
1046
1047 mach = bfd_m68k_features_to_mach (features);
1048 bfd_default_set_arch_mach (abfd, bfd_arch_m68k, mach);
1049
1050 return true;
1051 }
1052
1053 /* Somewhat reverse of elf32_m68k_object_p, this sets the e_flag
1054 field based on the machine number. */
1055
1056 static bool
elf_m68k_final_write_processing(bfd * abfd)1057 elf_m68k_final_write_processing (bfd *abfd)
1058 {
1059 int mach = bfd_get_mach (abfd);
1060 unsigned long e_flags = elf_elfheader (abfd)->e_flags;
1061
1062 if (!e_flags)
1063 {
1064 unsigned int arch_mask;
1065
1066 arch_mask = bfd_m68k_mach_to_features (mach);
1067
1068 if (arch_mask & m68000)
1069 e_flags = EF_M68K_M68000;
1070 else if (arch_mask & cpu32)
1071 e_flags = EF_M68K_CPU32;
1072 else if (arch_mask & fido_a)
1073 e_flags = EF_M68K_FIDO;
1074 else
1075 {
1076 switch (arch_mask
1077 & (mcfisa_a | mcfisa_aa | mcfisa_b | mcfisa_c | mcfhwdiv | mcfusp))
1078 {
1079 case mcfisa_a:
1080 e_flags |= EF_M68K_CF_ISA_A_NODIV;
1081 break;
1082 case mcfisa_a | mcfhwdiv:
1083 e_flags |= EF_M68K_CF_ISA_A;
1084 break;
1085 case mcfisa_a | mcfisa_aa | mcfhwdiv | mcfusp:
1086 e_flags |= EF_M68K_CF_ISA_A_PLUS;
1087 break;
1088 case mcfisa_a | mcfisa_b | mcfhwdiv:
1089 e_flags |= EF_M68K_CF_ISA_B_NOUSP;
1090 break;
1091 case mcfisa_a | mcfisa_b | mcfhwdiv | mcfusp:
1092 e_flags |= EF_M68K_CF_ISA_B;
1093 break;
1094 case mcfisa_a | mcfisa_c | mcfhwdiv | mcfusp:
1095 e_flags |= EF_M68K_CF_ISA_C;
1096 break;
1097 case mcfisa_a | mcfisa_c | mcfusp:
1098 e_flags |= EF_M68K_CF_ISA_C_NODIV;
1099 break;
1100 }
1101 if (arch_mask & mcfmac)
1102 e_flags |= EF_M68K_CF_MAC;
1103 else if (arch_mask & mcfemac)
1104 e_flags |= EF_M68K_CF_EMAC;
1105 if (arch_mask & cfloat)
1106 e_flags |= EF_M68K_CF_FLOAT | EF_M68K_CFV4E;
1107 }
1108 elf_elfheader (abfd)->e_flags = e_flags;
1109 }
1110 return _bfd_elf_final_write_processing (abfd);
1111 }
1112
1113 /* Keep m68k-specific flags in the ELF header. */
1114
1115 static bool
elf32_m68k_set_private_flags(bfd * abfd,flagword flags)1116 elf32_m68k_set_private_flags (bfd *abfd, flagword flags)
1117 {
1118 elf_elfheader (abfd)->e_flags = flags;
1119 elf_flags_init (abfd) = true;
1120 return true;
1121 }
1122
1123 /* Merge object attributes from IBFD into OBFD. Warn if
1124 there are conflicting attributes. */
1125 static bool
m68k_elf_merge_obj_attributes(bfd * ibfd,struct bfd_link_info * info)1126 m68k_elf_merge_obj_attributes (bfd *ibfd, struct bfd_link_info *info)
1127 {
1128 bfd *obfd = info->output_bfd;
1129 obj_attribute *in_attr, *in_attrs;
1130 obj_attribute *out_attr, *out_attrs;
1131 bool ret = true;
1132
1133 in_attrs = elf_known_obj_attributes (ibfd)[OBJ_ATTR_GNU];
1134 out_attrs = elf_known_obj_attributes (obfd)[OBJ_ATTR_GNU];
1135
1136 in_attr = &in_attrs[Tag_GNU_M68K_ABI_FP];
1137 out_attr = &out_attrs[Tag_GNU_M68K_ABI_FP];
1138
1139 if (in_attr->i != out_attr->i)
1140 {
1141 int in_fp = in_attr->i & 3;
1142 int out_fp = out_attr->i & 3;
1143 static bfd *last_fp;
1144
1145 if (in_fp == 0)
1146 ;
1147 else if (out_fp == 0)
1148 {
1149 out_attr->type = ATTR_TYPE_FLAG_INT_VAL;
1150 out_attr->i ^= in_fp;
1151 last_fp = ibfd;
1152 }
1153 else if (out_fp == 1 && in_fp == 2)
1154 {
1155 _bfd_error_handler
1156 /* xgettext:c-format */
1157 (_("%pB uses hard float, %pB uses soft float"),
1158 last_fp, ibfd);
1159 ret = false;
1160 }
1161 else if (out_fp == 2 && in_fp == 1)
1162 {
1163 _bfd_error_handler
1164 /* xgettext:c-format */
1165 (_("%pB uses hard float, %pB uses soft float"),
1166 ibfd, last_fp);
1167 ret = false;
1168 }
1169 }
1170
1171 if (!ret)
1172 {
1173 out_attr->type = ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_ERROR;
1174 bfd_set_error (bfd_error_bad_value);
1175 return false;
1176 }
1177
1178 /* Merge Tag_compatibility attributes and any common GNU ones. */
1179 return _bfd_elf_merge_object_attributes (ibfd, info);
1180 }
1181
1182 /* Merge backend specific data from an object file to the output
1183 object file when linking. */
1184 static bool
elf32_m68k_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)1185 elf32_m68k_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
1186 {
1187 bfd *obfd = info->output_bfd;
1188 flagword out_flags;
1189 flagword in_flags;
1190 flagword out_isa;
1191 flagword in_isa;
1192 const bfd_arch_info_type *arch_info;
1193
1194 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
1195 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
1196 /* PR 24523: For non-ELF files do not try to merge any private
1197 data, but also do not prevent the link from succeeding. */
1198 return true;
1199
1200 /* Get the merged machine. This checks for incompatibility between
1201 Coldfire & non-Coldfire flags, incompability between different
1202 Coldfire ISAs, and incompability between different MAC types. */
1203 arch_info = bfd_arch_get_compatible (ibfd, obfd, false);
1204 if (!arch_info)
1205 return false;
1206
1207 bfd_set_arch_mach (obfd, bfd_arch_m68k, arch_info->mach);
1208
1209 if (!m68k_elf_merge_obj_attributes (ibfd, info))
1210 return false;
1211
1212 in_flags = elf_elfheader (ibfd)->e_flags;
1213 if (!elf_flags_init (obfd))
1214 {
1215 elf_flags_init (obfd) = true;
1216 out_flags = in_flags;
1217 }
1218 else
1219 {
1220 out_flags = elf_elfheader (obfd)->e_flags;
1221 unsigned int variant_mask;
1222
1223 if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_M68000)
1224 variant_mask = 0;
1225 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)
1226 variant_mask = 0;
1227 else if ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO)
1228 variant_mask = 0;
1229 else
1230 variant_mask = EF_M68K_CF_ISA_MASK;
1231
1232 in_isa = (in_flags & variant_mask);
1233 out_isa = (out_flags & variant_mask);
1234 if (in_isa > out_isa)
1235 out_flags ^= in_isa ^ out_isa;
1236 if (((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32
1237 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO)
1238 || ((in_flags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO
1239 && (out_flags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32))
1240 out_flags = EF_M68K_FIDO;
1241 else
1242 out_flags |= in_flags ^ in_isa;
1243 }
1244 elf_elfheader (obfd)->e_flags = out_flags;
1245
1246 return true;
1247 }
1248
1249 /* Display the flags field. */
1250
1251 static bool
elf32_m68k_print_private_bfd_data(bfd * abfd,void * ptr)1252 elf32_m68k_print_private_bfd_data (bfd *abfd, void * ptr)
1253 {
1254 FILE *file = (FILE *) ptr;
1255 flagword eflags = elf_elfheader (abfd)->e_flags;
1256
1257 BFD_ASSERT (abfd != NULL && ptr != NULL);
1258
1259 /* Print normal ELF private data. */
1260 _bfd_elf_print_private_bfd_data (abfd, ptr);
1261
1262 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
1263
1264 /* xgettext:c-format */
1265 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
1266
1267 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_M68000)
1268 fprintf (file, " [m68000]");
1269 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CPU32)
1270 fprintf (file, " [cpu32]");
1271 else if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_FIDO)
1272 fprintf (file, " [fido]");
1273 else
1274 {
1275 if ((eflags & EF_M68K_ARCH_MASK) == EF_M68K_CFV4E)
1276 fprintf (file, " [cfv4e]");
1277
1278 if (eflags & EF_M68K_CF_ISA_MASK)
1279 {
1280 char const *isa = _("unknown");
1281 char const *mac = _("unknown");
1282 char const *additional = "";
1283
1284 switch (eflags & EF_M68K_CF_ISA_MASK)
1285 {
1286 case EF_M68K_CF_ISA_A_NODIV:
1287 isa = "A";
1288 additional = " [nodiv]";
1289 break;
1290 case EF_M68K_CF_ISA_A:
1291 isa = "A";
1292 break;
1293 case EF_M68K_CF_ISA_A_PLUS:
1294 isa = "A+";
1295 break;
1296 case EF_M68K_CF_ISA_B_NOUSP:
1297 isa = "B";
1298 additional = " [nousp]";
1299 break;
1300 case EF_M68K_CF_ISA_B:
1301 isa = "B";
1302 break;
1303 case EF_M68K_CF_ISA_C:
1304 isa = "C";
1305 break;
1306 case EF_M68K_CF_ISA_C_NODIV:
1307 isa = "C";
1308 additional = " [nodiv]";
1309 break;
1310 }
1311 fprintf (file, " [isa %s]%s", isa, additional);
1312
1313 if (eflags & EF_M68K_CF_FLOAT)
1314 fprintf (file, " [float]");
1315
1316 switch (eflags & EF_M68K_CF_MAC_MASK)
1317 {
1318 case 0:
1319 mac = NULL;
1320 break;
1321 case EF_M68K_CF_MAC:
1322 mac = "mac";
1323 break;
1324 case EF_M68K_CF_EMAC:
1325 mac = "emac";
1326 break;
1327 case EF_M68K_CF_EMAC_B:
1328 mac = "emac_b";
1329 break;
1330 }
1331 if (mac)
1332 fprintf (file, " [%s]", mac);
1333 }
1334 }
1335
1336 fputc ('\n', file);
1337
1338 return true;
1339 }
1340
1341 /* Multi-GOT support implementation design:
1342
1343 Multi-GOT starts in check_relocs hook. There we scan all
1344 relocations of a BFD and build a local GOT (struct elf_m68k_got)
1345 for it. If a single BFD appears to require too many GOT slots with
1346 R_68K_GOT8O or R_68K_GOT16O relocations, we fail with notification
1347 to user.
1348 After check_relocs has been invoked for each input BFD, we have
1349 constructed a GOT for each input BFD.
1350
1351 To minimize total number of GOTs required for a particular output BFD
1352 (as some environments support only 1 GOT per output object) we try
1353 to merge some of the GOTs to share an offset space. Ideally [and in most
1354 cases] we end up with a single GOT. In cases when there are too many
1355 restricted relocations (e.g., R_68K_GOT16O relocations) we end up with
1356 several GOTs, assuming the environment can handle them.
1357
1358 Partitioning is done in elf_m68k_partition_multi_got. We start with
1359 an empty GOT and traverse bfd2got hashtable putting got_entries from
1360 local GOTs to the new 'big' one. We do that by constructing an
1361 intermediate GOT holding all the entries the local GOT has and the big
1362 GOT lacks. Then we check if there is room in the big GOT to accomodate
1363 all the entries from diff. On success we add those entries to the big
1364 GOT; on failure we start the new 'big' GOT and retry the adding of
1365 entries from the local GOT. Note that this retry will always succeed as
1366 each local GOT doesn't overflow the limits. After partitioning we
1367 end up with each bfd assigned one of the big GOTs. GOT entries in the
1368 big GOTs are initialized with GOT offsets. Note that big GOTs are
1369 positioned consequently in program space and represent a single huge GOT
1370 to the outside world.
1371
1372 After that we get to elf_m68k_relocate_section. There we
1373 adjust relocations of GOT pointer (_GLOBAL_OFFSET_TABLE_) and symbol
1374 relocations to refer to appropriate [assigned to current input_bfd]
1375 big GOT.
1376
1377 Notes:
1378
1379 GOT entry type: We have several types of GOT entries.
1380 * R_8 type is used in entries for symbols that have at least one
1381 R_68K_GOT8O or R_68K_TLS_*8 relocation. We can have at most 0x40
1382 such entries in one GOT.
1383 * R_16 type is used in entries for symbols that have at least one
1384 R_68K_GOT16O or R_68K_TLS_*16 relocation and no R_8 relocations.
1385 We can have at most 0x4000 such entries in one GOT.
1386 * R_32 type is used in all other cases. We can have as many
1387 such entries in one GOT as we'd like.
1388 When counting relocations we have to include the count of the smaller
1389 ranged relocations in the counts of the larger ranged ones in order
1390 to correctly detect overflow.
1391
1392 Sorting the GOT: In each GOT starting offsets are assigned to
1393 R_8 entries, which are followed by R_16 entries, and
1394 R_32 entries go at the end. See finalize_got_offsets for details.
1395
1396 Negative GOT offsets: To double usable offset range of GOTs we use
1397 negative offsets. As we assign entries with GOT offsets relative to
1398 start of .got section, the offset values are positive. They become
1399 negative only in relocate_section where got->offset value is
1400 subtracted from them.
1401
1402 3 special GOT entries: There are 3 special GOT entries used internally
1403 by loader. These entries happen to be placed to .got.plt section,
1404 so we don't do anything about them in multi-GOT support.
1405
1406 Memory management: All data except for hashtables
1407 multi_got->bfd2got and got->entries are allocated on
1408 elf_hash_table (info)->dynobj bfd (for this reason we pass 'info'
1409 to most functions), so we don't need to care to free them. At the
1410 moment of allocation hashtables are being linked into main data
1411 structure (multi_got), all pieces of which are reachable from
1412 elf_m68k_multi_got (info). We deallocate them in
1413 elf_m68k_link_hash_table_free. */
1414
1415 /* Initialize GOT. */
1416
1417 static void
elf_m68k_init_got(struct elf_m68k_got * got)1418 elf_m68k_init_got (struct elf_m68k_got *got)
1419 {
1420 got->entries = NULL;
1421 got->n_slots[R_8] = 0;
1422 got->n_slots[R_16] = 0;
1423 got->n_slots[R_32] = 0;
1424 got->local_n_slots = 0;
1425 got->offset = (bfd_vma) -1;
1426 }
1427
1428 /* Destruct GOT. */
1429
1430 static void
elf_m68k_clear_got(struct elf_m68k_got * got)1431 elf_m68k_clear_got (struct elf_m68k_got *got)
1432 {
1433 if (got->entries != NULL)
1434 {
1435 htab_delete (got->entries);
1436 got->entries = NULL;
1437 }
1438 }
1439
1440 /* Create and empty GOT structure. INFO is the context where memory
1441 should be allocated. */
1442
1443 static struct elf_m68k_got *
elf_m68k_create_empty_got(struct bfd_link_info * info)1444 elf_m68k_create_empty_got (struct bfd_link_info *info)
1445 {
1446 struct elf_m68k_got *got;
1447
1448 got = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*got));
1449 if (got == NULL)
1450 return NULL;
1451
1452 elf_m68k_init_got (got);
1453
1454 return got;
1455 }
1456
1457 /* Initialize KEY. */
1458
1459 static void
elf_m68k_init_got_entry_key(struct elf_m68k_got_entry_key * key,struct elf_link_hash_entry * h,const bfd * abfd,unsigned long symndx,enum elf_m68k_reloc_type reloc_type)1460 elf_m68k_init_got_entry_key (struct elf_m68k_got_entry_key *key,
1461 struct elf_link_hash_entry *h,
1462 const bfd *abfd, unsigned long symndx,
1463 enum elf_m68k_reloc_type reloc_type)
1464 {
1465 if (elf_m68k_reloc_got_type (reloc_type) == R_68K_TLS_LDM32)
1466 /* All TLS_LDM relocations share a single GOT entry. */
1467 {
1468 key->bfd = NULL;
1469 key->symndx = 0;
1470 }
1471 else if (h != NULL)
1472 /* Global symbols are identified with their got_entry_key. */
1473 {
1474 key->bfd = NULL;
1475 key->symndx = elf_m68k_hash_entry (h)->got_entry_key;
1476 BFD_ASSERT (key->symndx != 0);
1477 }
1478 else
1479 /* Local symbols are identified by BFD they appear in and symndx. */
1480 {
1481 key->bfd = abfd;
1482 key->symndx = symndx;
1483 }
1484
1485 key->type = reloc_type;
1486 }
1487
1488 /* Calculate hash of got_entry.
1489 ??? Is it good? */
1490
1491 static hashval_t
elf_m68k_got_entry_hash(const void * _entry)1492 elf_m68k_got_entry_hash (const void *_entry)
1493 {
1494 const struct elf_m68k_got_entry_key *key;
1495
1496 key = &((const struct elf_m68k_got_entry *) _entry)->key_;
1497
1498 return (key->symndx
1499 + (key->bfd != NULL ? (int) key->bfd->id : -1)
1500 + elf_m68k_reloc_got_type (key->type));
1501 }
1502
1503 /* Check if two got entries are equal. */
1504
1505 static int
elf_m68k_got_entry_eq(const void * _entry1,const void * _entry2)1506 elf_m68k_got_entry_eq (const void *_entry1, const void *_entry2)
1507 {
1508 const struct elf_m68k_got_entry_key *key1;
1509 const struct elf_m68k_got_entry_key *key2;
1510
1511 key1 = &((const struct elf_m68k_got_entry *) _entry1)->key_;
1512 key2 = &((const struct elf_m68k_got_entry *) _entry2)->key_;
1513
1514 return (key1->bfd == key2->bfd
1515 && key1->symndx == key2->symndx
1516 && (elf_m68k_reloc_got_type (key1->type)
1517 == elf_m68k_reloc_got_type (key2->type)));
1518 }
1519
1520 /* When using negative offsets, we allocate one extra R_8, one extra R_16
1521 and one extra R_32 slots to simplify handling of 2-slot entries during
1522 offset allocation -- hence -1 for R_8 slots and -2 for R_16 slots. */
1523
1524 /* Maximal number of R_8 slots in a single GOT. */
1525 #define ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT(INFO) \
1526 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \
1527 ? (0x40 - 1) \
1528 : 0x20)
1529
1530 /* Maximal number of R_8 and R_16 slots in a single GOT. */
1531 #define ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT(INFO) \
1532 (elf_m68k_hash_table (INFO)->use_neg_got_offsets_p \
1533 ? (0x4000 - 2) \
1534 : 0x2000)
1535
1536 /* SEARCH - simply search the hashtable, don't insert new entries or fail when
1537 the entry cannot be found.
1538 FIND_OR_CREATE - search for an existing entry, but create new if there's
1539 no such.
1540 MUST_FIND - search for an existing entry and assert that it exist.
1541 MUST_CREATE - assert that there's no such entry and create new one. */
1542 enum elf_m68k_get_entry_howto
1543 {
1544 SEARCH,
1545 FIND_OR_CREATE,
1546 MUST_FIND,
1547 MUST_CREATE
1548 };
1549
1550 /* Get or create (depending on HOWTO) entry with KEY in GOT.
1551 INFO is context in which memory should be allocated (can be NULL if
1552 HOWTO is SEARCH or MUST_FIND). */
1553
1554 static struct elf_m68k_got_entry *
elf_m68k_get_got_entry(struct elf_m68k_got * got,const struct elf_m68k_got_entry_key * key,enum elf_m68k_get_entry_howto howto,struct bfd_link_info * info)1555 elf_m68k_get_got_entry (struct elf_m68k_got *got,
1556 const struct elf_m68k_got_entry_key *key,
1557 enum elf_m68k_get_entry_howto howto,
1558 struct bfd_link_info *info)
1559 {
1560 struct elf_m68k_got_entry entry_;
1561 struct elf_m68k_got_entry *entry;
1562 void **ptr;
1563
1564 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND));
1565
1566 if (got->entries == NULL)
1567 /* This is the first entry in ABFD. Initialize hashtable. */
1568 {
1569 if (howto == SEARCH)
1570 return NULL;
1571
1572 got->entries = htab_try_create (ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT
1573 (info),
1574 elf_m68k_got_entry_hash,
1575 elf_m68k_got_entry_eq, NULL);
1576 if (got->entries == NULL)
1577 {
1578 bfd_set_error (bfd_error_no_memory);
1579 return NULL;
1580 }
1581 }
1582
1583 entry_.key_ = *key;
1584 ptr = htab_find_slot (got->entries, &entry_,
1585 (howto == SEARCH || howto == MUST_FIND ? NO_INSERT
1586 : INSERT));
1587 if (ptr == NULL)
1588 {
1589 if (howto == SEARCH)
1590 /* Entry not found. */
1591 return NULL;
1592
1593 if (howto == MUST_FIND)
1594 abort ();
1595
1596 /* We're out of memory. */
1597 bfd_set_error (bfd_error_no_memory);
1598 return NULL;
1599 }
1600
1601 if (*ptr == NULL)
1602 /* We didn't find the entry and we're asked to create a new one. */
1603 {
1604 if (howto == MUST_FIND)
1605 abort ();
1606
1607 BFD_ASSERT (howto != SEARCH);
1608
1609 entry = bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry));
1610 if (entry == NULL)
1611 return NULL;
1612
1613 /* Initialize new entry. */
1614 entry->key_ = *key;
1615
1616 entry->u.s1.refcount = 0;
1617
1618 /* Mark the entry as not initialized. */
1619 entry->key_.type = R_68K_max;
1620
1621 *ptr = entry;
1622 }
1623 else
1624 /* We found the entry. */
1625 {
1626 BFD_ASSERT (howto != MUST_CREATE);
1627
1628 entry = *ptr;
1629 }
1630
1631 return entry;
1632 }
1633
1634 /* Update GOT counters when merging entry of WAS type with entry of NEW type.
1635 Return the value to which ENTRY's type should be set. */
1636
1637 static enum elf_m68k_reloc_type
elf_m68k_update_got_entry_type(struct elf_m68k_got * got,enum elf_m68k_reloc_type was,enum elf_m68k_reloc_type new_reloc)1638 elf_m68k_update_got_entry_type (struct elf_m68k_got *got,
1639 enum elf_m68k_reloc_type was,
1640 enum elf_m68k_reloc_type new_reloc)
1641 {
1642 enum elf_m68k_got_offset_size was_size;
1643 enum elf_m68k_got_offset_size new_size;
1644 bfd_vma n_slots;
1645
1646 if (was == R_68K_max)
1647 /* The type of the entry is not initialized yet. */
1648 {
1649 /* Update all got->n_slots counters, including n_slots[R_32]. */
1650 was_size = R_LAST;
1651
1652 was = new_reloc;
1653 }
1654 else
1655 {
1656 /* !!! We, probably, should emit an error rather then fail on assert
1657 in such a case. */
1658 BFD_ASSERT (elf_m68k_reloc_got_type (was)
1659 == elf_m68k_reloc_got_type (new_reloc));
1660
1661 was_size = elf_m68k_reloc_got_offset_size (was);
1662 }
1663
1664 new_size = elf_m68k_reloc_got_offset_size (new_reloc);
1665 n_slots = elf_m68k_reloc_got_n_slots (new_reloc);
1666
1667 while (was_size > new_size)
1668 {
1669 --was_size;
1670 got->n_slots[was_size] += n_slots;
1671 }
1672
1673 if (new_reloc > was)
1674 /* Relocations are ordered from bigger got offset size to lesser,
1675 so choose the relocation type with lesser offset size. */
1676 was = new_reloc;
1677
1678 return was;
1679 }
1680
1681 /* Add new or update existing entry to GOT.
1682 H, ABFD, TYPE and SYMNDX is data for the entry.
1683 INFO is a context where memory should be allocated. */
1684
1685 static struct elf_m68k_got_entry *
elf_m68k_add_entry_to_got(struct elf_m68k_got * got,struct elf_link_hash_entry * h,const bfd * abfd,enum elf_m68k_reloc_type reloc_type,unsigned long symndx,struct bfd_link_info * info)1686 elf_m68k_add_entry_to_got (struct elf_m68k_got *got,
1687 struct elf_link_hash_entry *h,
1688 const bfd *abfd,
1689 enum elf_m68k_reloc_type reloc_type,
1690 unsigned long symndx,
1691 struct bfd_link_info *info)
1692 {
1693 struct elf_m68k_got_entry_key key_;
1694 struct elf_m68k_got_entry *entry;
1695
1696 if (h != NULL && elf_m68k_hash_entry (h)->got_entry_key == 0)
1697 elf_m68k_hash_entry (h)->got_entry_key
1698 = elf_m68k_multi_got (info)->global_symndx++;
1699
1700 elf_m68k_init_got_entry_key (&key_, h, abfd, symndx, reloc_type);
1701
1702 entry = elf_m68k_get_got_entry (got, &key_, FIND_OR_CREATE, info);
1703 if (entry == NULL)
1704 return NULL;
1705
1706 /* Determine entry's type and update got->n_slots counters. */
1707 entry->key_.type = elf_m68k_update_got_entry_type (got,
1708 entry->key_.type,
1709 reloc_type);
1710
1711 /* Update refcount. */
1712 ++entry->u.s1.refcount;
1713
1714 if (entry->u.s1.refcount == 1)
1715 /* We see this entry for the first time. */
1716 {
1717 if (entry->key_.bfd != NULL)
1718 got->local_n_slots += elf_m68k_reloc_got_n_slots (entry->key_.type);
1719 }
1720
1721 BFD_ASSERT (got->n_slots[R_32] >= got->local_n_slots);
1722
1723 if ((got->n_slots[R_8]
1724 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info))
1725 || (got->n_slots[R_16]
1726 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))
1727 /* This BFD has too many relocation. */
1728 {
1729 if (got->n_slots[R_8] > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info))
1730 /* xgettext:c-format */
1731 _bfd_error_handler (_("%pB: GOT overflow: "
1732 "number of relocations with 8-bit "
1733 "offset > %d"),
1734 abfd,
1735 ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info));
1736 else
1737 /* xgettext:c-format */
1738 _bfd_error_handler (_("%pB: GOT overflow: "
1739 "number of relocations with 8- or 16-bit "
1740 "offset > %d"),
1741 abfd,
1742 ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info));
1743
1744 return NULL;
1745 }
1746
1747 return entry;
1748 }
1749
1750 /* Compute the hash value of the bfd in a bfd2got hash entry. */
1751
1752 static hashval_t
elf_m68k_bfd2got_entry_hash(const void * entry)1753 elf_m68k_bfd2got_entry_hash (const void *entry)
1754 {
1755 const struct elf_m68k_bfd2got_entry *e;
1756
1757 e = (const struct elf_m68k_bfd2got_entry *) entry;
1758
1759 return e->bfd->id;
1760 }
1761
1762 /* Check whether two hash entries have the same bfd. */
1763
1764 static int
elf_m68k_bfd2got_entry_eq(const void * entry1,const void * entry2)1765 elf_m68k_bfd2got_entry_eq (const void *entry1, const void *entry2)
1766 {
1767 const struct elf_m68k_bfd2got_entry *e1;
1768 const struct elf_m68k_bfd2got_entry *e2;
1769
1770 e1 = (const struct elf_m68k_bfd2got_entry *) entry1;
1771 e2 = (const struct elf_m68k_bfd2got_entry *) entry2;
1772
1773 return e1->bfd == e2->bfd;
1774 }
1775
1776 /* Destruct a bfd2got entry. */
1777
1778 static void
elf_m68k_bfd2got_entry_del(void * _entry)1779 elf_m68k_bfd2got_entry_del (void *_entry)
1780 {
1781 struct elf_m68k_bfd2got_entry *entry;
1782
1783 entry = (struct elf_m68k_bfd2got_entry *) _entry;
1784
1785 BFD_ASSERT (entry->got != NULL);
1786 elf_m68k_clear_got (entry->got);
1787 }
1788
1789 /* Find existing or create new (depending on HOWTO) bfd2got entry in
1790 MULTI_GOT. ABFD is the bfd we need a GOT for. INFO is a context where
1791 memory should be allocated. */
1792
1793 static struct elf_m68k_bfd2got_entry *
elf_m68k_get_bfd2got_entry(struct elf_m68k_multi_got * multi_got,const bfd * abfd,enum elf_m68k_get_entry_howto howto,struct bfd_link_info * info)1794 elf_m68k_get_bfd2got_entry (struct elf_m68k_multi_got *multi_got,
1795 const bfd *abfd,
1796 enum elf_m68k_get_entry_howto howto,
1797 struct bfd_link_info *info)
1798 {
1799 struct elf_m68k_bfd2got_entry entry_;
1800 void **ptr;
1801 struct elf_m68k_bfd2got_entry *entry;
1802
1803 BFD_ASSERT ((info == NULL) == (howto == SEARCH || howto == MUST_FIND));
1804
1805 if (multi_got->bfd2got == NULL)
1806 /* This is the first GOT. Initialize bfd2got. */
1807 {
1808 if (howto == SEARCH)
1809 return NULL;
1810
1811 multi_got->bfd2got = htab_try_create (1, elf_m68k_bfd2got_entry_hash,
1812 elf_m68k_bfd2got_entry_eq,
1813 elf_m68k_bfd2got_entry_del);
1814 if (multi_got->bfd2got == NULL)
1815 {
1816 bfd_set_error (bfd_error_no_memory);
1817 return NULL;
1818 }
1819 }
1820
1821 entry_.bfd = abfd;
1822 ptr = htab_find_slot (multi_got->bfd2got, &entry_,
1823 (howto == SEARCH || howto == MUST_FIND ? NO_INSERT
1824 : INSERT));
1825 if (ptr == NULL)
1826 {
1827 if (howto == SEARCH)
1828 /* Entry not found. */
1829 return NULL;
1830
1831 if (howto == MUST_FIND)
1832 abort ();
1833
1834 /* We're out of memory. */
1835 bfd_set_error (bfd_error_no_memory);
1836 return NULL;
1837 }
1838
1839 if (*ptr == NULL)
1840 /* Entry was not found. Create new one. */
1841 {
1842 if (howto == MUST_FIND)
1843 abort ();
1844
1845 BFD_ASSERT (howto != SEARCH);
1846
1847 entry = ((struct elf_m68k_bfd2got_entry *)
1848 bfd_alloc (elf_hash_table (info)->dynobj, sizeof (*entry)));
1849 if (entry == NULL)
1850 return NULL;
1851
1852 entry->bfd = abfd;
1853
1854 entry->got = elf_m68k_create_empty_got (info);
1855 if (entry->got == NULL)
1856 return NULL;
1857
1858 *ptr = entry;
1859 }
1860 else
1861 {
1862 BFD_ASSERT (howto != MUST_CREATE);
1863
1864 /* Return existing entry. */
1865 entry = *ptr;
1866 }
1867
1868 return entry;
1869 }
1870
1871 struct elf_m68k_can_merge_gots_arg
1872 {
1873 /* A current_got that we constructing a DIFF against. */
1874 struct elf_m68k_got *big;
1875
1876 /* GOT holding entries not present or that should be changed in
1877 BIG. */
1878 struct elf_m68k_got *diff;
1879
1880 /* Context where to allocate memory. */
1881 struct bfd_link_info *info;
1882
1883 /* Error flag. */
1884 bool error_p;
1885 };
1886
1887 /* Process a single entry from the small GOT to see if it should be added
1888 or updated in the big GOT. */
1889
1890 static int
elf_m68k_can_merge_gots_1(void ** _entry_ptr,void * _arg)1891 elf_m68k_can_merge_gots_1 (void **_entry_ptr, void *_arg)
1892 {
1893 const struct elf_m68k_got_entry *entry1;
1894 struct elf_m68k_can_merge_gots_arg *arg;
1895 const struct elf_m68k_got_entry *entry2;
1896 enum elf_m68k_reloc_type type;
1897
1898 entry1 = (const struct elf_m68k_got_entry *) *_entry_ptr;
1899 arg = (struct elf_m68k_can_merge_gots_arg *) _arg;
1900
1901 entry2 = elf_m68k_get_got_entry (arg->big, &entry1->key_, SEARCH, NULL);
1902
1903 if (entry2 != NULL)
1904 /* We found an existing entry. Check if we should update it. */
1905 {
1906 type = elf_m68k_update_got_entry_type (arg->diff,
1907 entry2->key_.type,
1908 entry1->key_.type);
1909
1910 if (type == entry2->key_.type)
1911 /* ENTRY1 doesn't update data in ENTRY2. Skip it.
1912 To skip creation of difference entry we use the type,
1913 which we won't see in GOT entries for sure. */
1914 type = R_68K_max;
1915 }
1916 else
1917 /* We didn't find the entry. Add entry1 to DIFF. */
1918 {
1919 BFD_ASSERT (entry1->key_.type != R_68K_max);
1920
1921 type = elf_m68k_update_got_entry_type (arg->diff,
1922 R_68K_max, entry1->key_.type);
1923
1924 if (entry1->key_.bfd != NULL)
1925 arg->diff->local_n_slots += elf_m68k_reloc_got_n_slots (type);
1926 }
1927
1928 if (type != R_68K_max)
1929 /* Create an entry in DIFF. */
1930 {
1931 struct elf_m68k_got_entry *entry;
1932
1933 entry = elf_m68k_get_got_entry (arg->diff, &entry1->key_, MUST_CREATE,
1934 arg->info);
1935 if (entry == NULL)
1936 {
1937 arg->error_p = true;
1938 return 0;
1939 }
1940
1941 entry->key_.type = type;
1942 }
1943
1944 return 1;
1945 }
1946
1947 /* Return TRUE if SMALL GOT can be added to BIG GOT without overflowing it.
1948 Construct DIFF GOT holding the entries which should be added or updated
1949 in BIG GOT to accumulate information from SMALL.
1950 INFO is the context where memory should be allocated. */
1951
1952 static bool
elf_m68k_can_merge_gots(struct elf_m68k_got * big,const struct elf_m68k_got * small,struct bfd_link_info * info,struct elf_m68k_got * diff)1953 elf_m68k_can_merge_gots (struct elf_m68k_got *big,
1954 const struct elf_m68k_got *small,
1955 struct bfd_link_info *info,
1956 struct elf_m68k_got *diff)
1957 {
1958 struct elf_m68k_can_merge_gots_arg arg_;
1959
1960 BFD_ASSERT (small->offset == (bfd_vma) -1);
1961
1962 arg_.big = big;
1963 arg_.diff = diff;
1964 arg_.info = info;
1965 arg_.error_p = false;
1966 htab_traverse_noresize (small->entries, elf_m68k_can_merge_gots_1, &arg_);
1967 if (arg_.error_p)
1968 {
1969 diff->offset = 0;
1970 return false;
1971 }
1972
1973 /* Check for overflow. */
1974 if ((big->n_slots[R_8] + arg_.diff->n_slots[R_8]
1975 > ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info))
1976 || (big->n_slots[R_16] + arg_.diff->n_slots[R_16]
1977 > ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info)))
1978 return false;
1979
1980 return true;
1981 }
1982
1983 struct elf_m68k_merge_gots_arg
1984 {
1985 /* The BIG got. */
1986 struct elf_m68k_got *big;
1987
1988 /* Context where memory should be allocated. */
1989 struct bfd_link_info *info;
1990
1991 /* Error flag. */
1992 bool error_p;
1993 };
1994
1995 /* Process a single entry from DIFF got. Add or update corresponding
1996 entry in the BIG got. */
1997
1998 static int
elf_m68k_merge_gots_1(void ** entry_ptr,void * _arg)1999 elf_m68k_merge_gots_1 (void **entry_ptr, void *_arg)
2000 {
2001 const struct elf_m68k_got_entry *from;
2002 struct elf_m68k_merge_gots_arg *arg;
2003 struct elf_m68k_got_entry *to;
2004
2005 from = (const struct elf_m68k_got_entry *) *entry_ptr;
2006 arg = (struct elf_m68k_merge_gots_arg *) _arg;
2007
2008 to = elf_m68k_get_got_entry (arg->big, &from->key_, FIND_OR_CREATE,
2009 arg->info);
2010 if (to == NULL)
2011 {
2012 arg->error_p = true;
2013 return 0;
2014 }
2015
2016 BFD_ASSERT (to->u.s1.refcount == 0);
2017 /* All we need to merge is TYPE. */
2018 to->key_.type = from->key_.type;
2019
2020 return 1;
2021 }
2022
2023 /* Merge data from DIFF to BIG. INFO is context where memory should be
2024 allocated. */
2025
2026 static bool
elf_m68k_merge_gots(struct elf_m68k_got * big,struct elf_m68k_got * diff,struct bfd_link_info * info)2027 elf_m68k_merge_gots (struct elf_m68k_got *big,
2028 struct elf_m68k_got *diff,
2029 struct bfd_link_info *info)
2030 {
2031 if (diff->entries != NULL)
2032 /* DIFF is not empty. Merge it into BIG GOT. */
2033 {
2034 struct elf_m68k_merge_gots_arg arg_;
2035
2036 /* Merge entries. */
2037 arg_.big = big;
2038 arg_.info = info;
2039 arg_.error_p = false;
2040 htab_traverse_noresize (diff->entries, elf_m68k_merge_gots_1, &arg_);
2041 if (arg_.error_p)
2042 return false;
2043
2044 /* Merge counters. */
2045 big->n_slots[R_8] += diff->n_slots[R_8];
2046 big->n_slots[R_16] += diff->n_slots[R_16];
2047 big->n_slots[R_32] += diff->n_slots[R_32];
2048 big->local_n_slots += diff->local_n_slots;
2049 }
2050 else
2051 /* DIFF is empty. */
2052 {
2053 BFD_ASSERT (diff->n_slots[R_8] == 0);
2054 BFD_ASSERT (diff->n_slots[R_16] == 0);
2055 BFD_ASSERT (diff->n_slots[R_32] == 0);
2056 BFD_ASSERT (diff->local_n_slots == 0);
2057 }
2058
2059 BFD_ASSERT (!elf_m68k_hash_table (info)->allow_multigot_p
2060 || ((big->n_slots[R_8]
2061 <= ELF_M68K_R_8_MAX_N_SLOTS_IN_GOT (info))
2062 && (big->n_slots[R_16]
2063 <= ELF_M68K_R_8_16_MAX_N_SLOTS_IN_GOT (info))));
2064
2065 return true;
2066 }
2067
2068 struct elf_m68k_finalize_got_offsets_arg
2069 {
2070 /* Ranges of the offsets for GOT entries.
2071 R_x entries receive offsets between offset1[R_x] and offset2[R_x].
2072 R_x is R_8, R_16 and R_32. */
2073 bfd_vma *offset1;
2074 bfd_vma *offset2;
2075
2076 /* Mapping from global symndx to global symbols.
2077 This is used to build lists of got entries for global symbols. */
2078 struct elf_m68k_link_hash_entry **symndx2h;
2079
2080 bfd_vma n_ldm_entries;
2081 };
2082
2083 /* Assign ENTRY an offset. Build list of GOT entries for global symbols
2084 along the way. */
2085
2086 static int
elf_m68k_finalize_got_offsets_1(void ** entry_ptr,void * _arg)2087 elf_m68k_finalize_got_offsets_1 (void **entry_ptr, void *_arg)
2088 {
2089 struct elf_m68k_got_entry *entry;
2090 struct elf_m68k_finalize_got_offsets_arg *arg;
2091
2092 enum elf_m68k_got_offset_size got_offset_size;
2093 bfd_vma entry_size;
2094
2095 entry = (struct elf_m68k_got_entry *) *entry_ptr;
2096 arg = (struct elf_m68k_finalize_got_offsets_arg *) _arg;
2097
2098 /* This should be a fresh entry created in elf_m68k_can_merge_gots. */
2099 BFD_ASSERT (entry->u.s1.refcount == 0);
2100
2101 /* Get GOT offset size for the entry . */
2102 got_offset_size = elf_m68k_reloc_got_offset_size (entry->key_.type);
2103
2104 /* Calculate entry size in bytes. */
2105 entry_size = 4 * elf_m68k_reloc_got_n_slots (entry->key_.type);
2106
2107 /* Check if we should switch to negative range of the offsets. */
2108 if (arg->offset1[got_offset_size] + entry_size
2109 > arg->offset2[got_offset_size])
2110 {
2111 /* Verify that this is the only switch to negative range for
2112 got_offset_size. If this assertion fails, then we've miscalculated
2113 range for got_offset_size entries in
2114 elf_m68k_finalize_got_offsets. */
2115 BFD_ASSERT (arg->offset2[got_offset_size]
2116 != arg->offset2[-(int) got_offset_size - 1]);
2117
2118 /* Switch. */
2119 arg->offset1[got_offset_size] = arg->offset1[-(int) got_offset_size - 1];
2120 arg->offset2[got_offset_size] = arg->offset2[-(int) got_offset_size - 1];
2121
2122 /* Verify that now we have enough room for the entry. */
2123 BFD_ASSERT (arg->offset1[got_offset_size] + entry_size
2124 <= arg->offset2[got_offset_size]);
2125 }
2126
2127 /* Assign offset to entry. */
2128 entry->u.s2.offset = arg->offset1[got_offset_size];
2129 arg->offset1[got_offset_size] += entry_size;
2130
2131 if (entry->key_.bfd == NULL)
2132 /* Hook up this entry into the list of got_entries of H. */
2133 {
2134 struct elf_m68k_link_hash_entry *h;
2135
2136 h = arg->symndx2h[entry->key_.symndx];
2137 if (h != NULL)
2138 {
2139 entry->u.s2.next = h->glist;
2140 h->glist = entry;
2141 }
2142 else
2143 /* This should be the entry for TLS_LDM relocation then. */
2144 {
2145 BFD_ASSERT ((elf_m68k_reloc_got_type (entry->key_.type)
2146 == R_68K_TLS_LDM32)
2147 && entry->key_.symndx == 0);
2148
2149 ++arg->n_ldm_entries;
2150 }
2151 }
2152 else
2153 /* This entry is for local symbol. */
2154 entry->u.s2.next = NULL;
2155
2156 return 1;
2157 }
2158
2159 /* Assign offsets within GOT. USE_NEG_GOT_OFFSETS_P indicates if we
2160 should use negative offsets.
2161 Build list of GOT entries for global symbols along the way.
2162 SYMNDX2H is mapping from global symbol indices to actual
2163 global symbols.
2164 Return offset at which next GOT should start. */
2165
2166 static void
elf_m68k_finalize_got_offsets(struct elf_m68k_got * got,bool use_neg_got_offsets_p,struct elf_m68k_link_hash_entry ** symndx2h,bfd_vma * final_offset,bfd_vma * n_ldm_entries)2167 elf_m68k_finalize_got_offsets (struct elf_m68k_got *got,
2168 bool use_neg_got_offsets_p,
2169 struct elf_m68k_link_hash_entry **symndx2h,
2170 bfd_vma *final_offset, bfd_vma *n_ldm_entries)
2171 {
2172 struct elf_m68k_finalize_got_offsets_arg arg_;
2173 bfd_vma offset1_[2 * R_LAST];
2174 bfd_vma offset2_[2 * R_LAST];
2175 int i;
2176 bfd_vma start_offset;
2177
2178 BFD_ASSERT (got->offset != (bfd_vma) -1);
2179
2180 /* We set entry offsets relative to the .got section (and not the
2181 start of a particular GOT), so that we can use them in
2182 finish_dynamic_symbol without needing to know the GOT which they come
2183 from. */
2184
2185 /* Put offset1 in the middle of offset1_, same for offset2. */
2186 arg_.offset1 = offset1_ + R_LAST;
2187 arg_.offset2 = offset2_ + R_LAST;
2188
2189 start_offset = got->offset;
2190
2191 if (use_neg_got_offsets_p)
2192 /* Setup both negative and positive ranges for R_8, R_16 and R_32. */
2193 i = -(int) R_32 - 1;
2194 else
2195 /* Setup positives ranges for R_8, R_16 and R_32. */
2196 i = (int) R_8;
2197
2198 for (; i <= (int) R_32; ++i)
2199 {
2200 int j;
2201 size_t n;
2202
2203 /* Set beginning of the range of offsets I. */
2204 arg_.offset1[i] = start_offset;
2205
2206 /* Calculate number of slots that require I offsets. */
2207 j = (i >= 0) ? i : -i - 1;
2208 n = (j >= 1) ? got->n_slots[j - 1] : 0;
2209 n = got->n_slots[j] - n;
2210
2211 if (use_neg_got_offsets_p && n != 0)
2212 {
2213 if (i < 0)
2214 /* We first fill the positive side of the range, so we might
2215 end up with one empty slot at that side when we can't fit
2216 whole 2-slot entry. Account for that at negative side of
2217 the interval with one additional entry. */
2218 n = n / 2 + 1;
2219 else
2220 /* When the number of slots is odd, make positive side of the
2221 range one entry bigger. */
2222 n = (n + 1) / 2;
2223 }
2224
2225 /* N is the number of slots that require I offsets.
2226 Calculate length of the range for I offsets. */
2227 n = 4 * n;
2228
2229 /* Set end of the range. */
2230 arg_.offset2[i] = start_offset + n;
2231
2232 start_offset = arg_.offset2[i];
2233 }
2234
2235 if (!use_neg_got_offsets_p)
2236 /* Make sure that if we try to switch to negative offsets in
2237 elf_m68k_finalize_got_offsets_1, the assert therein will catch
2238 the bug. */
2239 for (i = R_8; i <= R_32; ++i)
2240 arg_.offset2[-i - 1] = arg_.offset2[i];
2241
2242 /* Setup got->offset. offset1[R_8] is either in the middle or at the
2243 beginning of GOT depending on use_neg_got_offsets_p. */
2244 got->offset = arg_.offset1[R_8];
2245
2246 arg_.symndx2h = symndx2h;
2247 arg_.n_ldm_entries = 0;
2248
2249 /* Assign offsets. */
2250 htab_traverse (got->entries, elf_m68k_finalize_got_offsets_1, &arg_);
2251
2252 /* Check offset ranges we have actually assigned. */
2253 for (i = (int) R_8; i <= (int) R_32; ++i)
2254 BFD_ASSERT (arg_.offset2[i] - arg_.offset1[i] <= 4);
2255
2256 *final_offset = start_offset;
2257 *n_ldm_entries = arg_.n_ldm_entries;
2258 }
2259
2260 struct elf_m68k_partition_multi_got_arg
2261 {
2262 /* The GOT we are adding entries to. Aka big got. */
2263 struct elf_m68k_got *current_got;
2264
2265 /* Offset to assign the next CURRENT_GOT. */
2266 bfd_vma offset;
2267
2268 /* Context where memory should be allocated. */
2269 struct bfd_link_info *info;
2270
2271 /* Total number of slots in the .got section.
2272 This is used to calculate size of the .got and .rela.got sections. */
2273 bfd_vma n_slots;
2274
2275 /* Difference in numbers of allocated slots in the .got section
2276 and necessary relocations in the .rela.got section.
2277 This is used to calculate size of the .rela.got section. */
2278 bfd_vma slots_relas_diff;
2279
2280 /* Error flag. */
2281 bool error_p;
2282
2283 /* Mapping from global symndx to global symbols.
2284 This is used to build lists of got entries for global symbols. */
2285 struct elf_m68k_link_hash_entry **symndx2h;
2286 };
2287
2288 static void
elf_m68k_partition_multi_got_2(struct elf_m68k_partition_multi_got_arg * arg)2289 elf_m68k_partition_multi_got_2 (struct elf_m68k_partition_multi_got_arg *arg)
2290 {
2291 bfd_vma n_ldm_entries;
2292
2293 elf_m68k_finalize_got_offsets (arg->current_got,
2294 (elf_m68k_hash_table (arg->info)
2295 ->use_neg_got_offsets_p),
2296 arg->symndx2h,
2297 &arg->offset, &n_ldm_entries);
2298
2299 arg->n_slots += arg->current_got->n_slots[R_32];
2300
2301 if (!bfd_link_pic (arg->info))
2302 /* If we are generating a shared object, we need to
2303 output a R_68K_RELATIVE reloc so that the dynamic
2304 linker can adjust this GOT entry. Overwise we
2305 don't need space in .rela.got for local symbols. */
2306 arg->slots_relas_diff += arg->current_got->local_n_slots;
2307
2308 /* @LDM relocations require a 2-slot GOT entry, but only
2309 one relocation. Account for that. */
2310 arg->slots_relas_diff += n_ldm_entries;
2311
2312 BFD_ASSERT (arg->slots_relas_diff <= arg->n_slots);
2313 }
2314
2315
2316 /* Process a single BFD2GOT entry and either merge GOT to CURRENT_GOT
2317 or start a new CURRENT_GOT. */
2318
2319 static int
elf_m68k_partition_multi_got_1(void ** _entry,void * _arg)2320 elf_m68k_partition_multi_got_1 (void **_entry, void *_arg)
2321 {
2322 struct elf_m68k_bfd2got_entry *entry;
2323 struct elf_m68k_partition_multi_got_arg *arg;
2324 struct elf_m68k_got *got;
2325 struct elf_m68k_got diff_;
2326 struct elf_m68k_got *diff;
2327
2328 entry = (struct elf_m68k_bfd2got_entry *) *_entry;
2329 arg = (struct elf_m68k_partition_multi_got_arg *) _arg;
2330
2331 got = entry->got;
2332 BFD_ASSERT (got != NULL);
2333 BFD_ASSERT (got->offset == (bfd_vma) -1);
2334
2335 diff = NULL;
2336
2337 if (arg->current_got != NULL)
2338 /* Construct diff. */
2339 {
2340 diff = &diff_;
2341 elf_m68k_init_got (diff);
2342
2343 if (!elf_m68k_can_merge_gots (arg->current_got, got, arg->info, diff))
2344 {
2345 if (diff->offset == 0)
2346 /* Offset set to 0 in the diff_ indicates an error. */
2347 {
2348 arg->error_p = true;
2349 goto final_return;
2350 }
2351
2352 if (elf_m68k_hash_table (arg->info)->allow_multigot_p)
2353 {
2354 elf_m68k_clear_got (diff);
2355 /* Schedule to finish up current_got and start new one. */
2356 diff = NULL;
2357 }
2358 /* else
2359 Merge GOTs no matter what. If big GOT overflows,
2360 we'll fail in relocate_section due to truncated relocations.
2361
2362 ??? May be fail earlier? E.g., in can_merge_gots. */
2363 }
2364 }
2365 else
2366 /* Diff of got against empty current_got is got itself. */
2367 {
2368 /* Create empty current_got to put subsequent GOTs to. */
2369 arg->current_got = elf_m68k_create_empty_got (arg->info);
2370 if (arg->current_got == NULL)
2371 {
2372 arg->error_p = true;
2373 goto final_return;
2374 }
2375
2376 arg->current_got->offset = arg->offset;
2377
2378 diff = got;
2379 }
2380
2381 if (diff != NULL)
2382 {
2383 if (!elf_m68k_merge_gots (arg->current_got, diff, arg->info))
2384 {
2385 arg->error_p = true;
2386 goto final_return;
2387 }
2388
2389 /* Now we can free GOT. */
2390 elf_m68k_clear_got (got);
2391
2392 entry->got = arg->current_got;
2393 }
2394 else
2395 {
2396 /* Finish up current_got. */
2397 elf_m68k_partition_multi_got_2 (arg);
2398
2399 /* Schedule to start a new current_got. */
2400 arg->current_got = NULL;
2401
2402 /* Retry. */
2403 if (!elf_m68k_partition_multi_got_1 (_entry, _arg))
2404 {
2405 BFD_ASSERT (arg->error_p);
2406 goto final_return;
2407 }
2408 }
2409
2410 final_return:
2411 if (diff != NULL)
2412 elf_m68k_clear_got (diff);
2413
2414 return !arg->error_p;
2415 }
2416
2417 /* Helper function to build symndx2h mapping. */
2418
2419 static bool
elf_m68k_init_symndx2h_1(struct elf_link_hash_entry * _h,void * _arg)2420 elf_m68k_init_symndx2h_1 (struct elf_link_hash_entry *_h,
2421 void *_arg)
2422 {
2423 struct elf_m68k_link_hash_entry *h;
2424
2425 h = elf_m68k_hash_entry (_h);
2426
2427 if (h->got_entry_key != 0)
2428 /* H has at least one entry in the GOT. */
2429 {
2430 struct elf_m68k_partition_multi_got_arg *arg;
2431
2432 arg = (struct elf_m68k_partition_multi_got_arg *) _arg;
2433
2434 BFD_ASSERT (arg->symndx2h[h->got_entry_key] == NULL);
2435 arg->symndx2h[h->got_entry_key] = h;
2436 }
2437
2438 return true;
2439 }
2440
2441 /* Merge GOTs of some BFDs, assign offsets to GOT entries and build
2442 lists of GOT entries for global symbols.
2443 Calculate sizes of .got and .rela.got sections. */
2444
2445 static bool
elf_m68k_partition_multi_got(struct bfd_link_info * info)2446 elf_m68k_partition_multi_got (struct bfd_link_info *info)
2447 {
2448 struct elf_m68k_multi_got *multi_got;
2449 struct elf_m68k_partition_multi_got_arg arg_;
2450
2451 multi_got = elf_m68k_multi_got (info);
2452
2453 arg_.current_got = NULL;
2454 arg_.offset = 0;
2455 arg_.info = info;
2456 arg_.n_slots = 0;
2457 arg_.slots_relas_diff = 0;
2458 arg_.error_p = false;
2459
2460 if (multi_got->bfd2got != NULL)
2461 {
2462 /* Initialize symndx2h mapping. */
2463 {
2464 arg_.symndx2h = bfd_zmalloc (multi_got->global_symndx
2465 * sizeof (*arg_.symndx2h));
2466 if (arg_.symndx2h == NULL)
2467 return false;
2468
2469 elf_link_hash_traverse (elf_hash_table (info),
2470 elf_m68k_init_symndx2h_1, &arg_);
2471 }
2472
2473 /* Partition. */
2474 htab_traverse (multi_got->bfd2got, elf_m68k_partition_multi_got_1,
2475 &arg_);
2476 if (arg_.error_p)
2477 {
2478 free (arg_.symndx2h);
2479 arg_.symndx2h = NULL;
2480
2481 return false;
2482 }
2483
2484 /* Finish up last current_got. */
2485 elf_m68k_partition_multi_got_2 (&arg_);
2486
2487 free (arg_.symndx2h);
2488 }
2489
2490 if (elf_hash_table (info)->dynobj != NULL)
2491 /* Set sizes of .got and .rela.got sections. */
2492 {
2493 asection *s;
2494
2495 s = elf_hash_table (info)->sgot;
2496 if (s != NULL)
2497 s->size = arg_.offset;
2498 else
2499 BFD_ASSERT (arg_.offset == 0);
2500
2501 BFD_ASSERT (arg_.slots_relas_diff <= arg_.n_slots);
2502 arg_.n_slots -= arg_.slots_relas_diff;
2503
2504 s = elf_hash_table (info)->srelgot;
2505 if (s != NULL)
2506 s->size = arg_.n_slots * sizeof (Elf32_External_Rela);
2507 else
2508 BFD_ASSERT (arg_.n_slots == 0);
2509 }
2510 else
2511 BFD_ASSERT (multi_got->bfd2got == NULL);
2512
2513 return true;
2514 }
2515
2516 /* Copy any information related to dynamic linking from a pre-existing
2517 symbol to a newly created symbol. Also called to copy flags and
2518 other back-end info to a weakdef, in which case the symbol is not
2519 newly created and plt/got refcounts and dynamic indices should not
2520 be copied. */
2521
2522 static void
elf_m68k_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * _dir,struct elf_link_hash_entry * _ind)2523 elf_m68k_copy_indirect_symbol (struct bfd_link_info *info,
2524 struct elf_link_hash_entry *_dir,
2525 struct elf_link_hash_entry *_ind)
2526 {
2527 struct elf_m68k_link_hash_entry *dir;
2528 struct elf_m68k_link_hash_entry *ind;
2529
2530 _bfd_elf_link_hash_copy_indirect (info, _dir, _ind);
2531
2532 if (_ind->root.type != bfd_link_hash_indirect)
2533 return;
2534
2535 dir = elf_m68k_hash_entry (_dir);
2536 ind = elf_m68k_hash_entry (_ind);
2537
2538 /* Any absolute non-dynamic relocations against an indirect or weak
2539 definition will be against the target symbol. */
2540 _dir->non_got_ref |= _ind->non_got_ref;
2541
2542 /* We might have a direct symbol already having entries in the GOTs.
2543 Update its key only in case indirect symbol has GOT entries and
2544 assert that both indirect and direct symbols don't have GOT entries
2545 at the same time. */
2546 if (ind->got_entry_key != 0)
2547 {
2548 BFD_ASSERT (dir->got_entry_key == 0);
2549 /* Assert that GOTs aren't partioned yet. */
2550 BFD_ASSERT (ind->glist == NULL);
2551
2552 dir->got_entry_key = ind->got_entry_key;
2553 ind->got_entry_key = 0;
2554 }
2555 }
2556
2557 /* Look through the relocs for a section during the first phase, and
2558 allocate space in the global offset table or procedure linkage
2559 table. */
2560
2561 static bool
elf_m68k_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)2562 elf_m68k_check_relocs (bfd *abfd,
2563 struct bfd_link_info *info,
2564 asection *sec,
2565 const Elf_Internal_Rela *relocs)
2566 {
2567 bfd *dynobj;
2568 Elf_Internal_Shdr *symtab_hdr;
2569 struct elf_link_hash_entry **sym_hashes;
2570 const Elf_Internal_Rela *rel;
2571 const Elf_Internal_Rela *rel_end;
2572 asection *sreloc;
2573 struct elf_m68k_got *got;
2574
2575 if (bfd_link_relocatable (info))
2576 return true;
2577
2578 dynobj = elf_hash_table (info)->dynobj;
2579 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2580 sym_hashes = elf_sym_hashes (abfd);
2581
2582 sreloc = NULL;
2583
2584 got = NULL;
2585
2586 rel_end = relocs + sec->reloc_count;
2587 for (rel = relocs; rel < rel_end; rel++)
2588 {
2589 unsigned long r_symndx;
2590 struct elf_link_hash_entry *h;
2591
2592 r_symndx = ELF32_R_SYM (rel->r_info);
2593
2594 if (r_symndx < symtab_hdr->sh_info)
2595 h = NULL;
2596 else
2597 {
2598 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2599 while (h->root.type == bfd_link_hash_indirect
2600 || h->root.type == bfd_link_hash_warning)
2601 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2602 }
2603
2604 switch (ELF32_R_TYPE (rel->r_info))
2605 {
2606 case R_68K_GOT8:
2607 case R_68K_GOT16:
2608 case R_68K_GOT32:
2609 if (h != NULL
2610 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2611 break;
2612 /* Fall through. */
2613
2614 /* Relative GOT relocations. */
2615 case R_68K_GOT8O:
2616 case R_68K_GOT16O:
2617 case R_68K_GOT32O:
2618 /* Fall through. */
2619
2620 /* TLS relocations. */
2621 case R_68K_TLS_GD8:
2622 case R_68K_TLS_GD16:
2623 case R_68K_TLS_GD32:
2624 case R_68K_TLS_LDM8:
2625 case R_68K_TLS_LDM16:
2626 case R_68K_TLS_LDM32:
2627 case R_68K_TLS_IE8:
2628 case R_68K_TLS_IE16:
2629 case R_68K_TLS_IE32:
2630
2631 case R_68K_TLS_TPREL32:
2632 case R_68K_TLS_DTPREL32:
2633
2634 if (ELF32_R_TYPE (rel->r_info) == R_68K_TLS_TPREL32
2635 && bfd_link_pic (info))
2636 /* Do the special chorus for libraries with static TLS. */
2637 info->flags |= DF_STATIC_TLS;
2638
2639 /* This symbol requires a global offset table entry. */
2640
2641 if (dynobj == NULL)
2642 {
2643 /* Create the .got section. */
2644 elf_hash_table (info)->dynobj = dynobj = abfd;
2645 if (!_bfd_elf_create_got_section (dynobj, info))
2646 return false;
2647 }
2648
2649 if (got == NULL)
2650 {
2651 struct elf_m68k_bfd2got_entry *bfd2got_entry;
2652
2653 bfd2got_entry
2654 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info),
2655 abfd, FIND_OR_CREATE, info);
2656 if (bfd2got_entry == NULL)
2657 return false;
2658
2659 got = bfd2got_entry->got;
2660 BFD_ASSERT (got != NULL);
2661 }
2662
2663 {
2664 struct elf_m68k_got_entry *got_entry;
2665
2666 /* Add entry to got. */
2667 got_entry = elf_m68k_add_entry_to_got (got, h, abfd,
2668 ELF32_R_TYPE (rel->r_info),
2669 r_symndx, info);
2670 if (got_entry == NULL)
2671 return false;
2672
2673 if (got_entry->u.s1.refcount == 1)
2674 {
2675 /* Make sure this symbol is output as a dynamic symbol. */
2676 if (h != NULL
2677 && h->dynindx == -1
2678 && !h->forced_local)
2679 {
2680 if (!bfd_elf_link_record_dynamic_symbol (info, h))
2681 return false;
2682 }
2683 }
2684 }
2685
2686 break;
2687
2688 case R_68K_PLT8:
2689 case R_68K_PLT16:
2690 case R_68K_PLT32:
2691 /* This symbol requires a procedure linkage table entry. We
2692 actually build the entry in adjust_dynamic_symbol,
2693 because this might be a case of linking PIC code which is
2694 never referenced by a dynamic object, in which case we
2695 don't need to generate a procedure linkage table entry
2696 after all. */
2697
2698 /* If this is a local symbol, we resolve it directly without
2699 creating a procedure linkage table entry. */
2700 if (h == NULL)
2701 continue;
2702
2703 h->needs_plt = 1;
2704 h->plt.refcount++;
2705 break;
2706
2707 case R_68K_PLT8O:
2708 case R_68K_PLT16O:
2709 case R_68K_PLT32O:
2710 /* This symbol requires a procedure linkage table entry. */
2711
2712 if (h == NULL)
2713 {
2714 /* It does not make sense to have this relocation for a
2715 local symbol. FIXME: does it? How to handle it if
2716 it does make sense? */
2717 bfd_set_error (bfd_error_bad_value);
2718 return false;
2719 }
2720
2721 /* Make sure this symbol is output as a dynamic symbol. */
2722 if (h->dynindx == -1
2723 && !h->forced_local)
2724 {
2725 if (!bfd_elf_link_record_dynamic_symbol (info, h))
2726 return false;
2727 }
2728
2729 h->needs_plt = 1;
2730 h->plt.refcount++;
2731 break;
2732
2733 case R_68K_PC8:
2734 case R_68K_PC16:
2735 case R_68K_PC32:
2736 /* If we are creating a shared library and this is not a local
2737 symbol, we need to copy the reloc into the shared library.
2738 However when linking with -Bsymbolic and this is a global
2739 symbol which is defined in an object we are including in the
2740 link (i.e., DEF_REGULAR is set), then we can resolve the
2741 reloc directly. At this point we have not seen all the input
2742 files, so it is possible that DEF_REGULAR is not set now but
2743 will be set later (it is never cleared). We account for that
2744 possibility below by storing information in the
2745 pcrel_relocs_copied field of the hash table entry. */
2746 if (!(bfd_link_pic (info)
2747 && (sec->flags & SEC_ALLOC) != 0
2748 && h != NULL
2749 && (!SYMBOLIC_BIND (info, h)
2750 || h->root.type == bfd_link_hash_defweak
2751 || !h->def_regular)))
2752 {
2753 if (h != NULL)
2754 {
2755 /* Make sure a plt entry is created for this symbol if
2756 it turns out to be a function defined by a dynamic
2757 object. */
2758 h->plt.refcount++;
2759 }
2760 break;
2761 }
2762 /* Fall through. */
2763 case R_68K_8:
2764 case R_68K_16:
2765 case R_68K_32:
2766 /* We don't need to handle relocs into sections not going into
2767 the "real" output. */
2768 if ((sec->flags & SEC_ALLOC) == 0)
2769 break;
2770
2771 if (h != NULL)
2772 {
2773 /* Make sure a plt entry is created for this symbol if it
2774 turns out to be a function defined by a dynamic object. */
2775 h->plt.refcount++;
2776
2777 if (bfd_link_executable (info))
2778 /* This symbol needs a non-GOT reference. */
2779 h->non_got_ref = 1;
2780 }
2781
2782 /* If we are creating a shared library, we need to copy the
2783 reloc into the shared library. */
2784 if (bfd_link_pic (info)
2785 && (h == NULL
2786 || !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)))
2787 {
2788 /* When creating a shared object, we must copy these
2789 reloc types into the output file. We create a reloc
2790 section in dynobj and make room for this reloc. */
2791 if (sreloc == NULL)
2792 {
2793 sreloc = _bfd_elf_make_dynamic_reloc_section
2794 (sec, dynobj, 2, abfd, /*rela?*/ true);
2795
2796 if (sreloc == NULL)
2797 return false;
2798 }
2799
2800 if (sec->flags & SEC_READONLY
2801 /* Don't set DF_TEXTREL yet for PC relative
2802 relocations, they might be discarded later. */
2803 && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8
2804 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
2805 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32))
2806 info->flags |= DF_TEXTREL;
2807
2808 sreloc->size += sizeof (Elf32_External_Rela);
2809
2810 /* We count the number of PC relative relocations we have
2811 entered for this symbol, so that we can discard them
2812 again if, in the -Bsymbolic case, the symbol is later
2813 defined by a regular object, or, in the normal shared
2814 case, the symbol is forced to be local. Note that this
2815 function is only called if we are using an m68kelf linker
2816 hash table, which means that h is really a pointer to an
2817 elf_m68k_link_hash_entry. */
2818 if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8
2819 || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
2820 || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
2821 {
2822 struct elf_m68k_pcrel_relocs_copied *p;
2823 struct elf_m68k_pcrel_relocs_copied **head;
2824
2825 if (h != NULL)
2826 {
2827 struct elf_m68k_link_hash_entry *eh
2828 = elf_m68k_hash_entry (h);
2829 head = &eh->pcrel_relocs_copied;
2830 }
2831 else
2832 {
2833 asection *s;
2834 void *vpp;
2835 Elf_Internal_Sym *isym;
2836
2837 isym = bfd_sym_from_r_symndx (&elf_m68k_hash_table (info)->root.sym_cache,
2838 abfd, r_symndx);
2839 if (isym == NULL)
2840 return false;
2841
2842 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2843 if (s == NULL)
2844 s = sec;
2845
2846 vpp = &elf_section_data (s)->local_dynrel;
2847 head = (struct elf_m68k_pcrel_relocs_copied **) vpp;
2848 }
2849
2850 for (p = *head; p != NULL; p = p->next)
2851 if (p->section == sreloc)
2852 break;
2853
2854 if (p == NULL)
2855 {
2856 p = ((struct elf_m68k_pcrel_relocs_copied *)
2857 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
2858 if (p == NULL)
2859 return false;
2860 p->next = *head;
2861 *head = p;
2862 p->section = sreloc;
2863 p->count = 0;
2864 }
2865
2866 ++p->count;
2867 }
2868 }
2869
2870 break;
2871
2872 /* This relocation describes the C++ object vtable hierarchy.
2873 Reconstruct it for later use during GC. */
2874 case R_68K_GNU_VTINHERIT:
2875 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2876 return false;
2877 break;
2878
2879 /* This relocation describes which C++ vtable entries are actually
2880 used. Record for later use during GC. */
2881 case R_68K_GNU_VTENTRY:
2882 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2883 return false;
2884 break;
2885
2886 default:
2887 break;
2888 }
2889 }
2890
2891 return true;
2892 }
2893
2894 /* Return the section that should be marked against GC for a given
2895 relocation. */
2896
2897 static asection *
elf_m68k_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)2898 elf_m68k_gc_mark_hook (asection *sec,
2899 struct bfd_link_info *info,
2900 Elf_Internal_Rela *rel,
2901 struct elf_link_hash_entry *h,
2902 Elf_Internal_Sym *sym)
2903 {
2904 if (h != NULL)
2905 switch (ELF32_R_TYPE (rel->r_info))
2906 {
2907 case R_68K_GNU_VTINHERIT:
2908 case R_68K_GNU_VTENTRY:
2909 return NULL;
2910 }
2911
2912 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2913 }
2914
2915 /* Return the type of PLT associated with OUTPUT_BFD. */
2916
2917 static const struct elf_m68k_plt_info *
elf_m68k_get_plt_info(bfd * output_bfd)2918 elf_m68k_get_plt_info (bfd *output_bfd)
2919 {
2920 unsigned int features;
2921
2922 features = bfd_m68k_mach_to_features (bfd_get_mach (output_bfd));
2923 if (features & cpu32)
2924 return &elf_cpu32_plt_info;
2925 if (features & mcfisa_b)
2926 return &elf_isab_plt_info;
2927 if (features & mcfisa_c)
2928 return &elf_isac_plt_info;
2929 return &elf_m68k_plt_info;
2930 }
2931
2932 /* This function is called after all the input files have been read,
2933 and the input sections have been assigned to output sections.
2934 It's a convenient place to determine the PLT style. */
2935
2936 static bool
elf_m68k_early_size_sections(bfd * output_bfd,struct bfd_link_info * info)2937 elf_m68k_early_size_sections (bfd *output_bfd, struct bfd_link_info *info)
2938 {
2939 /* Bind input BFDs to GOTs and calculate sizes of .got and .rela.got
2940 sections. */
2941 if (!elf_m68k_partition_multi_got (info))
2942 return false;
2943
2944 elf_m68k_hash_table (info)->plt_info = elf_m68k_get_plt_info (output_bfd);
2945 return true;
2946 }
2947
2948 /* Adjust a symbol defined by a dynamic object and referenced by a
2949 regular object. The current definition is in some section of the
2950 dynamic object, but we're not including those sections. We have to
2951 change the definition to something the rest of the link can
2952 understand. */
2953
2954 static bool
elf_m68k_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)2955 elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info,
2956 struct elf_link_hash_entry *h)
2957 {
2958 struct elf_m68k_link_hash_table *htab;
2959 bfd *dynobj;
2960 asection *s;
2961
2962 htab = elf_m68k_hash_table (info);
2963 dynobj = htab->root.dynobj;
2964
2965 /* Make sure we know what is going on here. */
2966 BFD_ASSERT (dynobj != NULL
2967 && (h->needs_plt
2968 || h->is_weakalias
2969 || (h->def_dynamic
2970 && h->ref_regular
2971 && !h->def_regular)));
2972
2973 /* If this is a function, put it in the procedure linkage table. We
2974 will fill in the contents of the procedure linkage table later,
2975 when we know the address of the .got section. */
2976 if (h->type == STT_FUNC
2977 || h->needs_plt)
2978 {
2979 if ((h->plt.refcount <= 0
2980 || SYMBOL_CALLS_LOCAL (info, h)
2981 || ((ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2982 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
2983 && h->root.type == bfd_link_hash_undefweak))
2984 /* We must always create the plt entry if it was referenced
2985 by a PLTxxO relocation. In this case we already recorded
2986 it as a dynamic symbol. */
2987 && h->dynindx == -1)
2988 {
2989 /* This case can occur if we saw a PLTxx reloc in an input
2990 file, but the symbol was never referred to by a dynamic
2991 object, or if all references were garbage collected. In
2992 such a case, we don't actually need to build a procedure
2993 linkage table, and we can just do a PCxx reloc instead. */
2994 h->plt.offset = (bfd_vma) -1;
2995 h->needs_plt = 0;
2996 return true;
2997 }
2998
2999 /* Make sure this symbol is output as a dynamic symbol. */
3000 if (h->dynindx == -1
3001 && !h->forced_local)
3002 {
3003 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3004 return false;
3005 }
3006
3007 s = htab->root.splt;
3008 BFD_ASSERT (s != NULL);
3009
3010 /* If this is the first .plt entry, make room for the special
3011 first entry. */
3012 if (s->size == 0)
3013 s->size = htab->plt_info->size;
3014
3015 /* If this symbol is not defined in a regular file, and we are
3016 not generating a shared library, then set the symbol to this
3017 location in the .plt. This is required to make function
3018 pointers compare as equal between the normal executable and
3019 the shared library. */
3020 if (!bfd_link_pic (info)
3021 && !h->def_regular)
3022 {
3023 h->root.u.def.section = s;
3024 h->root.u.def.value = s->size;
3025 }
3026
3027 h->plt.offset = s->size;
3028
3029 /* Make room for this entry. */
3030 s->size += htab->plt_info->size;
3031
3032 /* We also need to make an entry in the .got.plt section, which
3033 will be placed in the .got section by the linker script. */
3034 s = htab->root.sgotplt;
3035 BFD_ASSERT (s != NULL);
3036 s->size += 4;
3037
3038 /* We also need to make an entry in the .rela.plt section. */
3039 s = htab->root.srelplt;
3040 BFD_ASSERT (s != NULL);
3041 s->size += sizeof (Elf32_External_Rela);
3042
3043 return true;
3044 }
3045
3046 /* Reinitialize the plt offset now that it is not used as a reference
3047 count any more. */
3048 h->plt.offset = (bfd_vma) -1;
3049
3050 /* If this is a weak symbol, and there is a real definition, the
3051 processor independent code will have arranged for us to see the
3052 real definition first, and we can just use the same value. */
3053 if (h->is_weakalias)
3054 {
3055 struct elf_link_hash_entry *def = weakdef (h);
3056 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
3057 h->root.u.def.section = def->root.u.def.section;
3058 h->root.u.def.value = def->root.u.def.value;
3059 return true;
3060 }
3061
3062 /* This is a reference to a symbol defined by a dynamic object which
3063 is not a function. */
3064
3065 /* If we are creating a shared library, we must presume that the
3066 only references to the symbol are via the global offset table.
3067 For such cases we need not do anything here; the relocations will
3068 be handled correctly by relocate_section. */
3069 if (bfd_link_pic (info))
3070 return true;
3071
3072 /* If there are no references to this symbol that do not use the
3073 GOT, we don't need to generate a copy reloc. */
3074 if (!h->non_got_ref)
3075 return true;
3076
3077 /* We must allocate the symbol in our .dynbss section, which will
3078 become part of the .bss section of the executable. There will be
3079 an entry for this symbol in the .dynsym section. The dynamic
3080 object will contain position independent code, so all references
3081 from the dynamic object to this symbol will go through the global
3082 offset table. The dynamic linker will use the .dynsym entry to
3083 determine the address it must put in the global offset table, so
3084 both the dynamic object and the regular object will refer to the
3085 same memory location for the variable. */
3086
3087 s = bfd_get_linker_section (dynobj, ".dynbss");
3088 BFD_ASSERT (s != NULL);
3089
3090 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
3091 copy the initial value out of the dynamic object and into the
3092 runtime process image. We need to remember the offset into the
3093 .rela.bss section we are going to use. */
3094 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
3095 {
3096 asection *srel;
3097
3098 srel = bfd_get_linker_section (dynobj, ".rela.bss");
3099 BFD_ASSERT (srel != NULL);
3100 srel->size += sizeof (Elf32_External_Rela);
3101 h->needs_copy = 1;
3102 }
3103
3104 return _bfd_elf_adjust_dynamic_copy (info, h, s);
3105 }
3106
3107 /* Set the sizes of the dynamic sections. */
3108
3109 static bool
elf_m68k_late_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)3110 elf_m68k_late_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
3111 struct bfd_link_info *info)
3112 {
3113 bfd *dynobj;
3114 asection *s;
3115 bool relocs;
3116
3117 dynobj = elf_hash_table (info)->dynobj;
3118 if (dynobj == NULL)
3119 return true;
3120
3121 if (elf_hash_table (info)->dynamic_sections_created)
3122 {
3123 /* Set the contents of the .interp section to the interpreter. */
3124 if (bfd_link_executable (info) && !info->nointerp)
3125 {
3126 s = bfd_get_linker_section (dynobj, ".interp");
3127 BFD_ASSERT (s != NULL);
3128 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3129 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3130 }
3131 }
3132 else
3133 {
3134 /* We may have created entries in the .rela.got section.
3135 However, if we are not creating the dynamic sections, we will
3136 not actually use these entries. Reset the size of .rela.got,
3137 which will cause it to get stripped from the output file
3138 below. */
3139 s = elf_hash_table (info)->srelgot;
3140 if (s != NULL)
3141 s->size = 0;
3142 }
3143
3144 /* If this is a -Bsymbolic shared link, then we need to discard all
3145 PC relative relocs against symbols defined in a regular object.
3146 For the normal shared case we discard the PC relative relocs
3147 against symbols that have become local due to visibility changes.
3148 We allocated space for them in the check_relocs routine, but we
3149 will not fill them in in the relocate_section routine. */
3150 if (bfd_link_pic (info))
3151 elf_link_hash_traverse (elf_hash_table (info),
3152 elf_m68k_discard_copies,
3153 info);
3154
3155 /* The check_relocs and adjust_dynamic_symbol entry points have
3156 determined the sizes of the various dynamic sections. Allocate
3157 memory for them. */
3158 relocs = false;
3159 for (s = dynobj->sections; s != NULL; s = s->next)
3160 {
3161 const char *name;
3162
3163 if ((s->flags & SEC_LINKER_CREATED) == 0)
3164 continue;
3165
3166 /* It's OK to base decisions on the section name, because none
3167 of the dynobj section names depend upon the input files. */
3168 name = bfd_section_name (s);
3169
3170 if (strcmp (name, ".plt") == 0)
3171 {
3172 /* Remember whether there is a PLT. */
3173 ;
3174 }
3175 else if (startswith (name, ".rela"))
3176 {
3177 if (s->size != 0)
3178 {
3179 relocs = true;
3180
3181 /* We use the reloc_count field as a counter if we need
3182 to copy relocs into the output file. */
3183 s->reloc_count = 0;
3184 }
3185 }
3186 else if (! startswith (name, ".got")
3187 && strcmp (name, ".dynbss") != 0)
3188 {
3189 /* It's not one of our sections, so don't allocate space. */
3190 continue;
3191 }
3192
3193 if (s->size == 0)
3194 {
3195 /* If we don't need this section, strip it from the
3196 output file. This is mostly to handle .rela.bss and
3197 .rela.plt. We must create both sections in
3198 create_dynamic_sections, because they must be created
3199 before the linker maps input sections to output
3200 sections. The linker does that before
3201 adjust_dynamic_symbol is called, and it is that
3202 function which decides whether anything needs to go
3203 into these sections. */
3204 s->flags |= SEC_EXCLUDE;
3205 continue;
3206 }
3207
3208 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3209 continue;
3210
3211 /* Allocate memory for the section contents. */
3212 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
3213 Unused entries should be reclaimed before the section's contents
3214 are written out, but at the moment this does not happen. Thus in
3215 order to prevent writing out garbage, we initialise the section's
3216 contents to zero. */
3217 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3218 if (s->contents == NULL)
3219 return false;
3220 }
3221
3222 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
3223 }
3224
3225 /* This function is called via elf_link_hash_traverse if we are
3226 creating a shared object. In the -Bsymbolic case it discards the
3227 space allocated to copy PC relative relocs against symbols which
3228 are defined in regular objects. For the normal shared case, it
3229 discards space for pc-relative relocs that have become local due to
3230 symbol visibility changes. We allocated space for them in the
3231 check_relocs routine, but we won't fill them in in the
3232 relocate_section routine.
3233
3234 We also check whether any of the remaining relocations apply
3235 against a readonly section, and set the DF_TEXTREL flag in this
3236 case. */
3237
3238 static bool
elf_m68k_discard_copies(struct elf_link_hash_entry * h,void * inf)3239 elf_m68k_discard_copies (struct elf_link_hash_entry *h,
3240 void * inf)
3241 {
3242 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3243 struct elf_m68k_pcrel_relocs_copied *s;
3244
3245 if (!SYMBOL_CALLS_LOCAL (info, h))
3246 {
3247 if ((info->flags & DF_TEXTREL) == 0)
3248 {
3249 /* Look for relocations against read-only sections. */
3250 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
3251 s != NULL;
3252 s = s->next)
3253 if ((s->section->flags & SEC_READONLY) != 0)
3254 {
3255 info->flags |= DF_TEXTREL;
3256 break;
3257 }
3258 }
3259
3260 /* Make sure undefined weak symbols are output as a dynamic symbol
3261 in PIEs. */
3262 if (h->non_got_ref
3263 && h->root.type == bfd_link_hash_undefweak
3264 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3265 && h->dynindx == -1
3266 && !h->forced_local)
3267 {
3268 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3269 return false;
3270 }
3271
3272 return true;
3273 }
3274
3275 for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied;
3276 s != NULL;
3277 s = s->next)
3278 s->section->size -= s->count * sizeof (Elf32_External_Rela);
3279
3280 return true;
3281 }
3282
3283
3284 /* Install relocation RELA. */
3285
3286 static void
elf_m68k_install_rela(bfd * output_bfd,asection * srela,Elf_Internal_Rela * rela)3287 elf_m68k_install_rela (bfd *output_bfd,
3288 asection *srela,
3289 Elf_Internal_Rela *rela)
3290 {
3291 bfd_byte *loc;
3292
3293 loc = srela->contents;
3294 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
3295 bfd_elf32_swap_reloca_out (output_bfd, rela, loc);
3296 }
3297
3298 /* Find the base offsets for thread-local storage in this object,
3299 for GD/LD and IE/LE respectively. */
3300
3301 #define DTP_OFFSET 0x8000
3302 #define TP_OFFSET 0x7000
3303
3304 static bfd_vma
dtpoff_base(struct bfd_link_info * info)3305 dtpoff_base (struct bfd_link_info *info)
3306 {
3307 /* If tls_sec is NULL, we should have signalled an error already. */
3308 if (elf_hash_table (info)->tls_sec == NULL)
3309 return 0;
3310 return elf_hash_table (info)->tls_sec->vma + DTP_OFFSET;
3311 }
3312
3313 static bfd_vma
tpoff_base(struct bfd_link_info * info)3314 tpoff_base (struct bfd_link_info *info)
3315 {
3316 /* If tls_sec is NULL, we should have signalled an error already. */
3317 if (elf_hash_table (info)->tls_sec == NULL)
3318 return 0;
3319 return elf_hash_table (info)->tls_sec->vma + TP_OFFSET;
3320 }
3321
3322 /* Output necessary relocation to handle a symbol during static link.
3323 This function is called from elf_m68k_relocate_section. */
3324
3325 static void
elf_m68k_init_got_entry_static(struct bfd_link_info * info,bfd * output_bfd,enum elf_m68k_reloc_type r_type,asection * sgot,bfd_vma got_entry_offset,bfd_vma relocation)3326 elf_m68k_init_got_entry_static (struct bfd_link_info *info,
3327 bfd *output_bfd,
3328 enum elf_m68k_reloc_type r_type,
3329 asection *sgot,
3330 bfd_vma got_entry_offset,
3331 bfd_vma relocation)
3332 {
3333 switch (elf_m68k_reloc_got_type (r_type))
3334 {
3335 case R_68K_GOT32O:
3336 bfd_put_32 (output_bfd, relocation, sgot->contents + got_entry_offset);
3337 break;
3338
3339 case R_68K_TLS_GD32:
3340 /* We know the offset within the module,
3341 put it into the second GOT slot. */
3342 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3343 sgot->contents + got_entry_offset + 4);
3344 /* FALLTHRU */
3345
3346 case R_68K_TLS_LDM32:
3347 /* Mark it as belonging to module 1, the executable. */
3348 bfd_put_32 (output_bfd, 1, sgot->contents + got_entry_offset);
3349 break;
3350
3351 case R_68K_TLS_IE32:
3352 bfd_put_32 (output_bfd, relocation - tpoff_base (info),
3353 sgot->contents + got_entry_offset);
3354 break;
3355
3356 default:
3357 BFD_ASSERT (false);
3358 }
3359 }
3360
3361 /* Output necessary relocation to handle a local symbol
3362 during dynamic link.
3363 This function is called either from elf_m68k_relocate_section
3364 or from elf_m68k_finish_dynamic_symbol. */
3365
3366 static void
elf_m68k_init_got_entry_local_shared(struct bfd_link_info * info,bfd * output_bfd,enum elf_m68k_reloc_type r_type,asection * sgot,bfd_vma got_entry_offset,bfd_vma relocation,asection * srela)3367 elf_m68k_init_got_entry_local_shared (struct bfd_link_info *info,
3368 bfd *output_bfd,
3369 enum elf_m68k_reloc_type r_type,
3370 asection *sgot,
3371 bfd_vma got_entry_offset,
3372 bfd_vma relocation,
3373 asection *srela)
3374 {
3375 Elf_Internal_Rela outrel;
3376
3377 switch (elf_m68k_reloc_got_type (r_type))
3378 {
3379 case R_68K_GOT32O:
3380 /* Emit RELATIVE relocation to initialize GOT slot
3381 at run-time. */
3382 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
3383 outrel.r_addend = relocation;
3384 break;
3385
3386 case R_68K_TLS_GD32:
3387 /* We know the offset within the module,
3388 put it into the second GOT slot. */
3389 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3390 sgot->contents + got_entry_offset + 4);
3391 /* FALLTHRU */
3392
3393 case R_68K_TLS_LDM32:
3394 /* We don't know the module number,
3395 create a relocation for it. */
3396 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_DTPMOD32);
3397 outrel.r_addend = 0;
3398 break;
3399
3400 case R_68K_TLS_IE32:
3401 /* Emit TPREL relocation to initialize GOT slot
3402 at run-time. */
3403 outrel.r_info = ELF32_R_INFO (0, R_68K_TLS_TPREL32);
3404 outrel.r_addend = relocation - elf_hash_table (info)->tls_sec->vma;
3405 break;
3406
3407 default:
3408 BFD_ASSERT (false);
3409 }
3410
3411 /* Offset of the GOT entry. */
3412 outrel.r_offset = (sgot->output_section->vma
3413 + sgot->output_offset
3414 + got_entry_offset);
3415
3416 /* Install one of the above relocations. */
3417 elf_m68k_install_rela (output_bfd, srela, &outrel);
3418
3419 bfd_put_32 (output_bfd, outrel.r_addend, sgot->contents + got_entry_offset);
3420 }
3421
3422 /* Relocate an M68K ELF section. */
3423
3424 static int
elf_m68k_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)3425 elf_m68k_relocate_section (bfd *output_bfd,
3426 struct bfd_link_info *info,
3427 bfd *input_bfd,
3428 asection *input_section,
3429 bfd_byte *contents,
3430 Elf_Internal_Rela *relocs,
3431 Elf_Internal_Sym *local_syms,
3432 asection **local_sections)
3433 {
3434 Elf_Internal_Shdr *symtab_hdr;
3435 struct elf_link_hash_entry **sym_hashes;
3436 asection *sgot;
3437 asection *splt;
3438 asection *sreloc;
3439 asection *srela;
3440 struct elf_m68k_got *got;
3441 Elf_Internal_Rela *rel;
3442 Elf_Internal_Rela *relend;
3443
3444 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3445 sym_hashes = elf_sym_hashes (input_bfd);
3446
3447 sgot = NULL;
3448 splt = NULL;
3449 sreloc = NULL;
3450 srela = NULL;
3451
3452 got = NULL;
3453
3454 rel = relocs;
3455 relend = relocs + input_section->reloc_count;
3456 for (; rel < relend; rel++)
3457 {
3458 int r_type;
3459 reloc_howto_type *howto;
3460 unsigned long r_symndx;
3461 struct elf_link_hash_entry *h;
3462 Elf_Internal_Sym *sym;
3463 asection *sec;
3464 bfd_vma relocation;
3465 bool unresolved_reloc;
3466 bfd_reloc_status_type r;
3467 bool resolved_to_zero;
3468
3469 r_type = ELF32_R_TYPE (rel->r_info);
3470 if (r_type < 0 || r_type >= (int) R_68K_max)
3471 {
3472 bfd_set_error (bfd_error_bad_value);
3473 return false;
3474 }
3475 howto = howto_table + r_type;
3476
3477 r_symndx = ELF32_R_SYM (rel->r_info);
3478
3479 h = NULL;
3480 sym = NULL;
3481 sec = NULL;
3482 unresolved_reloc = false;
3483
3484 if (r_symndx < symtab_hdr->sh_info)
3485 {
3486 sym = local_syms + r_symndx;
3487 sec = local_sections[r_symndx];
3488 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
3489 }
3490 else
3491 {
3492 bool warned, ignored;
3493
3494 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3495 r_symndx, symtab_hdr, sym_hashes,
3496 h, sec, relocation,
3497 unresolved_reloc, warned, ignored);
3498 }
3499
3500 if (sec != NULL && discarded_section (sec))
3501 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3502 rel, 1, relend, howto, 0, contents);
3503
3504 if (bfd_link_relocatable (info))
3505 continue;
3506
3507 resolved_to_zero = (h != NULL
3508 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
3509
3510 switch (r_type)
3511 {
3512 case R_68K_GOT8:
3513 case R_68K_GOT16:
3514 case R_68K_GOT32:
3515 /* Relocation is to the address of the entry for this symbol
3516 in the global offset table. */
3517 if (h != NULL
3518 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3519 {
3520 if (elf_m68k_hash_table (info)->local_gp_p)
3521 {
3522 bfd_vma sgot_output_offset;
3523 bfd_vma got_offset;
3524
3525 sgot = elf_hash_table (info)->sgot;
3526
3527 if (sgot != NULL)
3528 sgot_output_offset = sgot->output_offset;
3529 else
3530 /* In this case we have a reference to
3531 _GLOBAL_OFFSET_TABLE_, but the GOT itself is
3532 empty.
3533 ??? Issue a warning? */
3534 sgot_output_offset = 0;
3535
3536 if (got == NULL)
3537 {
3538 struct elf_m68k_bfd2got_entry *bfd2got_entry;
3539
3540 bfd2got_entry
3541 = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info),
3542 input_bfd, SEARCH, NULL);
3543
3544 if (bfd2got_entry != NULL)
3545 {
3546 got = bfd2got_entry->got;
3547 BFD_ASSERT (got != NULL);
3548
3549 got_offset = got->offset;
3550 }
3551 else
3552 /* In this case we have a reference to
3553 _GLOBAL_OFFSET_TABLE_, but no other references
3554 accessing any GOT entries.
3555 ??? Issue a warning? */
3556 got_offset = 0;
3557 }
3558 else
3559 got_offset = got->offset;
3560
3561 /* Adjust GOT pointer to point to the GOT
3562 assigned to input_bfd. */
3563 rel->r_addend += sgot_output_offset + got_offset;
3564 }
3565 else
3566 BFD_ASSERT (got == NULL || got->offset == 0);
3567
3568 break;
3569 }
3570 /* Fall through. */
3571 case R_68K_GOT8O:
3572 case R_68K_GOT16O:
3573 case R_68K_GOT32O:
3574
3575 case R_68K_TLS_LDM32:
3576 case R_68K_TLS_LDM16:
3577 case R_68K_TLS_LDM8:
3578
3579 case R_68K_TLS_GD8:
3580 case R_68K_TLS_GD16:
3581 case R_68K_TLS_GD32:
3582
3583 case R_68K_TLS_IE8:
3584 case R_68K_TLS_IE16:
3585 case R_68K_TLS_IE32:
3586
3587 /* Relocation is the offset of the entry for this symbol in
3588 the global offset table. */
3589
3590 {
3591 struct elf_m68k_got_entry_key key_;
3592 bfd_vma *off_ptr;
3593 bfd_vma off;
3594
3595 sgot = elf_hash_table (info)->sgot;
3596 BFD_ASSERT (sgot != NULL);
3597
3598 if (got == NULL)
3599 got = elf_m68k_get_bfd2got_entry (elf_m68k_multi_got (info),
3600 input_bfd, MUST_FIND,
3601 NULL)->got;
3602
3603 /* Get GOT offset for this symbol. */
3604 elf_m68k_init_got_entry_key (&key_, h, input_bfd, r_symndx,
3605 r_type);
3606 off_ptr = &elf_m68k_get_got_entry (got, &key_, MUST_FIND,
3607 NULL)->u.s2.offset;
3608 off = *off_ptr;
3609
3610 /* The offset must always be a multiple of 4. We use
3611 the least significant bit to record whether we have
3612 already generated the necessary reloc. */
3613 if ((off & 1) != 0)
3614 off &= ~1;
3615 else
3616 {
3617 if (h != NULL
3618 /* @TLSLDM relocations are bounded to the module, in
3619 which the symbol is defined -- not to the symbol
3620 itself. */
3621 && elf_m68k_reloc_got_type (r_type) != R_68K_TLS_LDM32)
3622 {
3623 bool dyn;
3624
3625 dyn = elf_hash_table (info)->dynamic_sections_created;
3626 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
3627 bfd_link_pic (info),
3628 h)
3629 || (bfd_link_pic (info)
3630 && SYMBOL_REFERENCES_LOCAL (info, h))
3631 || ((ELF_ST_VISIBILITY (h->other)
3632 || resolved_to_zero)
3633 && h->root.type == bfd_link_hash_undefweak))
3634 {
3635 /* This is actually a static link, or it is a
3636 -Bsymbolic link and the symbol is defined
3637 locally, or the symbol was forced to be local
3638 because of a version file. We must initialize
3639 this entry in the global offset table. Since
3640 the offset must always be a multiple of 4, we
3641 use the least significant bit to record whether
3642 we have initialized it already.
3643
3644 When doing a dynamic link, we create a .rela.got
3645 relocation entry to initialize the value. This
3646 is done in the finish_dynamic_symbol routine. */
3647
3648 elf_m68k_init_got_entry_static (info,
3649 output_bfd,
3650 r_type,
3651 sgot,
3652 off,
3653 relocation);
3654
3655 *off_ptr |= 1;
3656 }
3657 else
3658 unresolved_reloc = false;
3659 }
3660 else if (bfd_link_pic (info)) /* && h == NULL */
3661 /* Process local symbol during dynamic link. */
3662 {
3663 srela = elf_hash_table (info)->srelgot;
3664 BFD_ASSERT (srela != NULL);
3665
3666 elf_m68k_init_got_entry_local_shared (info,
3667 output_bfd,
3668 r_type,
3669 sgot,
3670 off,
3671 relocation,
3672 srela);
3673
3674 *off_ptr |= 1;
3675 }
3676 else /* h == NULL && !bfd_link_pic (info) */
3677 {
3678 elf_m68k_init_got_entry_static (info,
3679 output_bfd,
3680 r_type,
3681 sgot,
3682 off,
3683 relocation);
3684
3685 *off_ptr |= 1;
3686 }
3687 }
3688
3689 /* We don't use elf_m68k_reloc_got_type in the condition below
3690 because this is the only place where difference between
3691 R_68K_GOTx and R_68K_GOTxO relocations matters. */
3692 if (r_type == R_68K_GOT32O
3693 || r_type == R_68K_GOT16O
3694 || r_type == R_68K_GOT8O
3695 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_GD32
3696 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_LDM32
3697 || elf_m68k_reloc_got_type (r_type) == R_68K_TLS_IE32)
3698 {
3699 /* GOT pointer is adjusted to point to the start/middle
3700 of local GOT. Adjust the offset accordingly. */
3701 BFD_ASSERT (elf_m68k_hash_table (info)->use_neg_got_offsets_p
3702 || off >= got->offset);
3703
3704 if (elf_m68k_hash_table (info)->local_gp_p)
3705 relocation = off - got->offset;
3706 else
3707 {
3708 BFD_ASSERT (got->offset == 0);
3709 relocation = sgot->output_offset + off;
3710 }
3711
3712 /* This relocation does not use the addend. */
3713 rel->r_addend = 0;
3714 }
3715 else
3716 relocation = (sgot->output_section->vma + sgot->output_offset
3717 + off);
3718 }
3719 break;
3720
3721 case R_68K_TLS_LDO32:
3722 case R_68K_TLS_LDO16:
3723 case R_68K_TLS_LDO8:
3724 relocation -= dtpoff_base (info);
3725 break;
3726
3727 case R_68K_TLS_LE32:
3728 case R_68K_TLS_LE16:
3729 case R_68K_TLS_LE8:
3730 if (bfd_link_dll (info))
3731 {
3732 _bfd_error_handler
3733 /* xgettext:c-format */
3734 (_("%pB(%pA+%#" PRIx64 "): "
3735 "%s relocation not permitted in shared object"),
3736 input_bfd, input_section, (uint64_t) rel->r_offset,
3737 howto->name);
3738
3739 return false;
3740 }
3741 else
3742 relocation -= tpoff_base (info);
3743
3744 break;
3745
3746 case R_68K_PLT8:
3747 case R_68K_PLT16:
3748 case R_68K_PLT32:
3749 /* Relocation is to the entry for this symbol in the
3750 procedure linkage table. */
3751
3752 /* Resolve a PLTxx reloc against a local symbol directly,
3753 without using the procedure linkage table. */
3754 if (h == NULL)
3755 break;
3756
3757 if (h->plt.offset == (bfd_vma) -1
3758 || !elf_hash_table (info)->dynamic_sections_created)
3759 {
3760 /* We didn't make a PLT entry for this symbol. This
3761 happens when statically linking PIC code, or when
3762 using -Bsymbolic. */
3763 break;
3764 }
3765
3766 splt = elf_hash_table (info)->splt;
3767 BFD_ASSERT (splt != NULL);
3768
3769 relocation = (splt->output_section->vma
3770 + splt->output_offset
3771 + h->plt.offset);
3772 unresolved_reloc = false;
3773 break;
3774
3775 case R_68K_PLT8O:
3776 case R_68K_PLT16O:
3777 case R_68K_PLT32O:
3778 /* Relocation is the offset of the entry for this symbol in
3779 the procedure linkage table. */
3780 BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1);
3781
3782 splt = elf_hash_table (info)->splt;
3783 BFD_ASSERT (splt != NULL);
3784
3785 relocation = h->plt.offset;
3786 unresolved_reloc = false;
3787
3788 /* This relocation does not use the addend. */
3789 rel->r_addend = 0;
3790
3791 break;
3792
3793 case R_68K_8:
3794 case R_68K_16:
3795 case R_68K_32:
3796 case R_68K_PC8:
3797 case R_68K_PC16:
3798 case R_68K_PC32:
3799 if (bfd_link_pic (info)
3800 && r_symndx != STN_UNDEF
3801 && (input_section->flags & SEC_ALLOC) != 0
3802 && (h == NULL
3803 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3804 && !resolved_to_zero)
3805 || h->root.type != bfd_link_hash_undefweak)
3806 && ((r_type != R_68K_PC8
3807 && r_type != R_68K_PC16
3808 && r_type != R_68K_PC32)
3809 || !SYMBOL_CALLS_LOCAL (info, h)))
3810 {
3811 Elf_Internal_Rela outrel;
3812 bfd_byte *loc;
3813 bool skip, relocate;
3814
3815 /* When generating a shared object, these relocations
3816 are copied into the output file to be resolved at run
3817 time. */
3818
3819 skip = false;
3820 relocate = false;
3821
3822 outrel.r_offset =
3823 _bfd_elf_section_offset (output_bfd, info, input_section,
3824 rel->r_offset);
3825 if (outrel.r_offset == (bfd_vma) -1)
3826 skip = true;
3827 else if (outrel.r_offset == (bfd_vma) -2)
3828 skip = true, relocate = true;
3829 outrel.r_offset += (input_section->output_section->vma
3830 + input_section->output_offset);
3831
3832 if (skip)
3833 memset (&outrel, 0, sizeof outrel);
3834 else if (h != NULL
3835 && h->dynindx != -1
3836 && (r_type == R_68K_PC8
3837 || r_type == R_68K_PC16
3838 || r_type == R_68K_PC32
3839 || !bfd_link_pic (info)
3840 || !SYMBOLIC_BIND (info, h)
3841 || !h->def_regular))
3842 {
3843 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3844 outrel.r_addend = rel->r_addend;
3845 }
3846 else
3847 {
3848 /* This symbol is local, or marked to become local. */
3849 outrel.r_addend = relocation + rel->r_addend;
3850
3851 if (r_type == R_68K_32)
3852 {
3853 relocate = true;
3854 outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
3855 }
3856 else
3857 {
3858 long indx;
3859
3860 if (bfd_is_abs_section (sec))
3861 indx = 0;
3862 else if (sec == NULL || sec->owner == NULL)
3863 {
3864 bfd_set_error (bfd_error_bad_value);
3865 return false;
3866 }
3867 else
3868 {
3869 asection *osec;
3870
3871 /* We are turning this relocation into one
3872 against a section symbol. It would be
3873 proper to subtract the symbol's value,
3874 osec->vma, from the emitted reloc addend,
3875 but ld.so expects buggy relocs. */
3876 osec = sec->output_section;
3877 indx = elf_section_data (osec)->dynindx;
3878 if (indx == 0)
3879 {
3880 struct elf_link_hash_table *htab;
3881 htab = elf_hash_table (info);
3882 osec = htab->text_index_section;
3883 indx = elf_section_data (osec)->dynindx;
3884 }
3885 BFD_ASSERT (indx != 0);
3886 }
3887
3888 outrel.r_info = ELF32_R_INFO (indx, r_type);
3889 }
3890 }
3891
3892 sreloc = elf_section_data (input_section)->sreloc;
3893 if (sreloc == NULL)
3894 abort ();
3895
3896 loc = sreloc->contents;
3897 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3898 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3899
3900 /* This reloc will be computed at runtime, so there's no
3901 need to do anything now, except for R_68K_32
3902 relocations that have been turned into
3903 R_68K_RELATIVE. */
3904 if (!relocate)
3905 continue;
3906 }
3907
3908 break;
3909
3910 case R_68K_GNU_VTINHERIT:
3911 case R_68K_GNU_VTENTRY:
3912 /* These are no-ops in the end. */
3913 continue;
3914
3915 default:
3916 break;
3917 }
3918
3919 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3920 because such sections are not SEC_ALLOC and thus ld.so will
3921 not process them. */
3922 if (unresolved_reloc
3923 && !((input_section->flags & SEC_DEBUGGING) != 0
3924 && h->def_dynamic)
3925 && _bfd_elf_section_offset (output_bfd, info, input_section,
3926 rel->r_offset) != (bfd_vma) -1)
3927 {
3928 _bfd_error_handler
3929 /* xgettext:c-format */
3930 (_("%pB(%pA+%#" PRIx64 "): "
3931 "unresolvable %s relocation against symbol `%s'"),
3932 input_bfd,
3933 input_section,
3934 (uint64_t) rel->r_offset,
3935 howto->name,
3936 h->root.root.string);
3937 return false;
3938 }
3939
3940 if (r_symndx != STN_UNDEF
3941 && r_type != R_68K_NONE
3942 && (h == NULL
3943 || h->root.type == bfd_link_hash_defined
3944 || h->root.type == bfd_link_hash_defweak))
3945 {
3946 char sym_type;
3947
3948 sym_type = (sym != NULL) ? ELF32_ST_TYPE (sym->st_info) : h->type;
3949
3950 if (elf_m68k_reloc_tls_p (r_type) != (sym_type == STT_TLS))
3951 {
3952 const char *name;
3953
3954 if (h != NULL)
3955 name = h->root.root.string;
3956 else
3957 {
3958 name = (bfd_elf_string_from_elf_section
3959 (input_bfd, symtab_hdr->sh_link, sym->st_name));
3960 if (name == NULL || *name == '\0')
3961 name = bfd_section_name (sec);
3962 }
3963
3964 _bfd_error_handler
3965 ((sym_type == STT_TLS
3966 /* xgettext:c-format */
3967 ? _("%pB(%pA+%#" PRIx64 "): %s used with TLS symbol %s")
3968 /* xgettext:c-format */
3969 : _("%pB(%pA+%#" PRIx64 "): %s used with non-TLS symbol %s")),
3970 input_bfd,
3971 input_section,
3972 (uint64_t) rel->r_offset,
3973 howto->name,
3974 name);
3975 }
3976 }
3977
3978 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3979 contents, rel->r_offset,
3980 relocation, rel->r_addend);
3981
3982 if (r != bfd_reloc_ok)
3983 {
3984 const char *name;
3985
3986 if (h != NULL)
3987 name = h->root.root.string;
3988 else
3989 {
3990 name = bfd_elf_string_from_elf_section (input_bfd,
3991 symtab_hdr->sh_link,
3992 sym->st_name);
3993 if (name == NULL)
3994 return false;
3995 if (*name == '\0')
3996 name = bfd_section_name (sec);
3997 }
3998
3999 if (r == bfd_reloc_overflow)
4000 (*info->callbacks->reloc_overflow)
4001 (info, (h ? &h->root : NULL), name, howto->name,
4002 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
4003 else
4004 {
4005 _bfd_error_handler
4006 /* xgettext:c-format */
4007 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
4008 input_bfd, input_section,
4009 (uint64_t) rel->r_offset, name, (int) r);
4010 return false;
4011 }
4012 }
4013 }
4014
4015 return true;
4016 }
4017
4018 /* Install an M_68K_PC32 relocation against VALUE at offset OFFSET
4019 into section SEC. */
4020
4021 static void
elf_m68k_install_pc32(asection * sec,bfd_vma offset,bfd_vma value)4022 elf_m68k_install_pc32 (asection *sec, bfd_vma offset, bfd_vma value)
4023 {
4024 /* Make VALUE PC-relative. */
4025 value -= sec->output_section->vma + offset;
4026
4027 /* Apply any in-place addend. */
4028 value += bfd_get_32 (sec->owner, sec->contents + offset);
4029
4030 bfd_put_32 (sec->owner, value, sec->contents + offset);
4031 }
4032
4033 /* Finish up dynamic symbol handling. We set the contents of various
4034 dynamic sections here. */
4035
4036 static bool
elf_m68k_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)4037 elf_m68k_finish_dynamic_symbol (bfd *output_bfd,
4038 struct bfd_link_info *info,
4039 struct elf_link_hash_entry *h,
4040 Elf_Internal_Sym *sym)
4041 {
4042 bfd *dynobj;
4043
4044 dynobj = elf_hash_table (info)->dynobj;
4045
4046 if (h->plt.offset != (bfd_vma) -1)
4047 {
4048 const struct elf_m68k_plt_info *plt_info;
4049 asection *splt;
4050 asection *sgot;
4051 asection *srela;
4052 bfd_vma plt_index;
4053 bfd_vma got_offset;
4054 Elf_Internal_Rela rela;
4055 bfd_byte *loc;
4056
4057 /* This symbol has an entry in the procedure linkage table. Set
4058 it up. */
4059
4060 BFD_ASSERT (h->dynindx != -1);
4061
4062 plt_info = elf_m68k_hash_table (info)->plt_info;
4063 splt = elf_hash_table (info)->splt;
4064 sgot = elf_hash_table (info)->sgotplt;
4065 srela = elf_hash_table (info)->srelplt;
4066 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
4067
4068 /* Get the index in the procedure linkage table which
4069 corresponds to this symbol. This is the index of this symbol
4070 in all the symbols for which we are making plt entries. The
4071 first entry in the procedure linkage table is reserved. */
4072 plt_index = (h->plt.offset / plt_info->size) - 1;
4073
4074 /* Get the offset into the .got table of the entry that
4075 corresponds to this function. Each .got entry is 4 bytes.
4076 The first three are reserved. */
4077 got_offset = (plt_index + 3) * 4;
4078
4079 memcpy (splt->contents + h->plt.offset,
4080 plt_info->symbol_entry,
4081 plt_info->size);
4082
4083 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.got,
4084 (sgot->output_section->vma
4085 + sgot->output_offset
4086 + got_offset));
4087
4088 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
4089 splt->contents
4090 + h->plt.offset
4091 + plt_info->symbol_resolve_entry + 2);
4092
4093 elf_m68k_install_pc32 (splt, h->plt.offset + plt_info->symbol_relocs.plt,
4094 splt->output_section->vma);
4095
4096 /* Fill in the entry in the global offset table. */
4097 bfd_put_32 (output_bfd,
4098 (splt->output_section->vma
4099 + splt->output_offset
4100 + h->plt.offset
4101 + plt_info->symbol_resolve_entry),
4102 sgot->contents + got_offset);
4103
4104 /* Fill in the entry in the .rela.plt section. */
4105 rela.r_offset = (sgot->output_section->vma
4106 + sgot->output_offset
4107 + got_offset);
4108 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
4109 rela.r_addend = 0;
4110 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
4111 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
4112
4113 if (!h->def_regular)
4114 {
4115 /* Mark the symbol as undefined, rather than as defined in
4116 the .plt section. Leave the value alone. */
4117 sym->st_shndx = SHN_UNDEF;
4118 }
4119 }
4120
4121 if (elf_m68k_hash_entry (h)->glist != NULL)
4122 {
4123 asection *sgot;
4124 asection *srela;
4125 struct elf_m68k_got_entry *got_entry;
4126
4127 /* This symbol has an entry in the global offset table. Set it
4128 up. */
4129
4130 sgot = elf_hash_table (info)->sgot;
4131 srela = elf_hash_table (info)->srelgot;
4132 BFD_ASSERT (sgot != NULL && srela != NULL);
4133
4134 got_entry = elf_m68k_hash_entry (h)->glist;
4135
4136 while (got_entry != NULL)
4137 {
4138 enum elf_m68k_reloc_type r_type;
4139 bfd_vma got_entry_offset;
4140
4141 r_type = got_entry->key_.type;
4142 got_entry_offset = got_entry->u.s2.offset &~ (bfd_vma) 1;
4143
4144 /* If this is a -Bsymbolic link, and the symbol is defined
4145 locally, we just want to emit a RELATIVE reloc. Likewise if
4146 the symbol was forced to be local because of a version file.
4147 The entry in the global offset table already have been
4148 initialized in the relocate_section function. */
4149 if (bfd_link_pic (info)
4150 && SYMBOL_REFERENCES_LOCAL (info, h))
4151 {
4152 bfd_vma relocation;
4153
4154 relocation = bfd_get_signed_32 (output_bfd,
4155 (sgot->contents
4156 + got_entry_offset));
4157
4158 /* Undo TP bias. */
4159 switch (elf_m68k_reloc_got_type (r_type))
4160 {
4161 case R_68K_GOT32O:
4162 case R_68K_TLS_LDM32:
4163 break;
4164
4165 case R_68K_TLS_GD32:
4166 /* The value for this relocation is actually put in
4167 the second GOT slot. */
4168 relocation = bfd_get_signed_32 (output_bfd,
4169 (sgot->contents
4170 + got_entry_offset + 4));
4171 relocation += dtpoff_base (info);
4172 break;
4173
4174 case R_68K_TLS_IE32:
4175 relocation += tpoff_base (info);
4176 break;
4177
4178 default:
4179 BFD_ASSERT (false);
4180 }
4181
4182 elf_m68k_init_got_entry_local_shared (info,
4183 output_bfd,
4184 r_type,
4185 sgot,
4186 got_entry_offset,
4187 relocation,
4188 srela);
4189 }
4190 else
4191 {
4192 Elf_Internal_Rela rela;
4193
4194 /* Put zeros to GOT slots that will be initialized
4195 at run-time. */
4196 {
4197 bfd_vma n_slots;
4198
4199 n_slots = elf_m68k_reloc_got_n_slots (got_entry->key_.type);
4200 while (n_slots--)
4201 bfd_put_32 (output_bfd, (bfd_vma) 0,
4202 (sgot->contents + got_entry_offset
4203 + 4 * n_slots));
4204 }
4205
4206 rela.r_addend = 0;
4207 rela.r_offset = (sgot->output_section->vma
4208 + sgot->output_offset
4209 + got_entry_offset);
4210
4211 switch (elf_m68k_reloc_got_type (r_type))
4212 {
4213 case R_68K_GOT32O:
4214 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
4215 elf_m68k_install_rela (output_bfd, srela, &rela);
4216 break;
4217
4218 case R_68K_TLS_GD32:
4219 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPMOD32);
4220 elf_m68k_install_rela (output_bfd, srela, &rela);
4221
4222 rela.r_offset += 4;
4223 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_DTPREL32);
4224 elf_m68k_install_rela (output_bfd, srela, &rela);
4225 break;
4226
4227 case R_68K_TLS_IE32:
4228 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_TLS_TPREL32);
4229 elf_m68k_install_rela (output_bfd, srela, &rela);
4230 break;
4231
4232 default:
4233 BFD_ASSERT (false);
4234 break;
4235 }
4236 }
4237
4238 got_entry = got_entry->u.s2.next;
4239 }
4240 }
4241
4242 if (h->needs_copy)
4243 {
4244 asection *s;
4245 Elf_Internal_Rela rela;
4246 bfd_byte *loc;
4247
4248 /* This symbol needs a copy reloc. Set it up. */
4249
4250 BFD_ASSERT (h->dynindx != -1
4251 && (h->root.type == bfd_link_hash_defined
4252 || h->root.type == bfd_link_hash_defweak));
4253
4254 s = bfd_get_linker_section (dynobj, ".rela.bss");
4255 BFD_ASSERT (s != NULL);
4256
4257 rela.r_offset = (h->root.u.def.value
4258 + h->root.u.def.section->output_section->vma
4259 + h->root.u.def.section->output_offset);
4260 rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
4261 rela.r_addend = 0;
4262 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
4263 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
4264 }
4265
4266 return true;
4267 }
4268
4269 /* Finish up the dynamic sections. */
4270
4271 static bool
elf_m68k_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)4272 elf_m68k_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
4273 {
4274 bfd *dynobj;
4275 asection *sgot;
4276 asection *sdyn;
4277
4278 dynobj = elf_hash_table (info)->dynobj;
4279
4280 sgot = elf_hash_table (info)->sgotplt;
4281 BFD_ASSERT (sgot != NULL);
4282 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4283
4284 if (elf_hash_table (info)->dynamic_sections_created)
4285 {
4286 asection *splt;
4287 Elf32_External_Dyn *dyncon, *dynconend;
4288
4289 splt = elf_hash_table (info)->splt;
4290 BFD_ASSERT (splt != NULL && sdyn != NULL);
4291
4292 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4293 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4294 for (; dyncon < dynconend; dyncon++)
4295 {
4296 Elf_Internal_Dyn dyn;
4297 asection *s;
4298
4299 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4300
4301 switch (dyn.d_tag)
4302 {
4303 default:
4304 break;
4305
4306 case DT_PLTGOT:
4307 s = elf_hash_table (info)->sgotplt;
4308 goto get_vma;
4309 case DT_JMPREL:
4310 s = elf_hash_table (info)->srelplt;
4311 get_vma:
4312 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4313 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4314 break;
4315
4316 case DT_PLTRELSZ:
4317 s = elf_hash_table (info)->srelplt;
4318 dyn.d_un.d_val = s->size;
4319 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4320 break;
4321 }
4322 }
4323
4324 /* Fill in the first entry in the procedure linkage table. */
4325 if (splt->size > 0)
4326 {
4327 const struct elf_m68k_plt_info *plt_info;
4328
4329 plt_info = elf_m68k_hash_table (info)->plt_info;
4330 memcpy (splt->contents, plt_info->plt0_entry, plt_info->size);
4331
4332 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got4,
4333 (sgot->output_section->vma
4334 + sgot->output_offset
4335 + 4));
4336
4337 elf_m68k_install_pc32 (splt, plt_info->plt0_relocs.got8,
4338 (sgot->output_section->vma
4339 + sgot->output_offset
4340 + 8));
4341
4342 elf_section_data (splt->output_section)->this_hdr.sh_entsize
4343 = plt_info->size;
4344 }
4345 }
4346
4347 /* Fill in the first three entries in the global offset table. */
4348 if (sgot->size > 0)
4349 {
4350 if (sdyn == NULL)
4351 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
4352 else
4353 bfd_put_32 (output_bfd,
4354 sdyn->output_section->vma + sdyn->output_offset,
4355 sgot->contents);
4356 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
4357 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
4358 }
4359
4360 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
4361
4362 return true;
4363 }
4364
4365 /* Given a .data section and a .emreloc in-memory section, store
4366 relocation information into the .emreloc section which can be
4367 used at runtime to relocate the section. This is called by the
4368 linker when the --embedded-relocs switch is used. This is called
4369 after the add_symbols entry point has been called for all the
4370 objects, and before the final_link entry point is called. */
4371
4372 bool
bfd_m68k_elf32_create_embedded_relocs(bfd * abfd,struct bfd_link_info * info,asection * datasec,asection * relsec,char ** errmsg)4373 bfd_m68k_elf32_create_embedded_relocs (bfd *abfd, struct bfd_link_info *info,
4374 asection *datasec, asection *relsec,
4375 char **errmsg)
4376 {
4377 Elf_Internal_Shdr *symtab_hdr;
4378 Elf_Internal_Sym *isymbuf = NULL;
4379 Elf_Internal_Rela *internal_relocs = NULL;
4380 Elf_Internal_Rela *irel, *irelend;
4381 bfd_byte *p;
4382 bfd_size_type amt;
4383
4384 BFD_ASSERT (! bfd_link_relocatable (info));
4385
4386 *errmsg = NULL;
4387
4388 if (datasec->reloc_count == 0)
4389 return true;
4390
4391 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4392
4393 /* Get a copy of the native relocations. */
4394 internal_relocs = (_bfd_elf_link_read_relocs
4395 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL,
4396 info->keep_memory));
4397 if (internal_relocs == NULL)
4398 goto error_return;
4399
4400 amt = (bfd_size_type) datasec->reloc_count * 12;
4401 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
4402 if (relsec->contents == NULL)
4403 goto error_return;
4404
4405 p = relsec->contents;
4406
4407 irelend = internal_relocs + datasec->reloc_count;
4408 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
4409 {
4410 asection *targetsec;
4411
4412 /* We are going to write a four byte longword into the runtime
4413 reloc section. The longword will be the address in the data
4414 section which must be relocated. It is followed by the name
4415 of the target section NUL-padded or truncated to 8
4416 characters. */
4417
4418 /* We can only relocate absolute longword relocs at run time. */
4419 if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32)
4420 {
4421 *errmsg = _("unsupported relocation type");
4422 bfd_set_error (bfd_error_bad_value);
4423 goto error_return;
4424 }
4425
4426 /* Get the target section referred to by the reloc. */
4427 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
4428 {
4429 /* A local symbol. */
4430 Elf_Internal_Sym *isym;
4431
4432 /* Read this BFD's local symbols if we haven't done so already. */
4433 if (isymbuf == NULL)
4434 {
4435 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
4436 if (isymbuf == NULL)
4437 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
4438 symtab_hdr->sh_info, 0,
4439 NULL, NULL, NULL);
4440 if (isymbuf == NULL)
4441 goto error_return;
4442 }
4443
4444 isym = isymbuf + ELF32_R_SYM (irel->r_info);
4445 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4446 }
4447 else
4448 {
4449 unsigned long indx;
4450 struct elf_link_hash_entry *h;
4451
4452 /* An external symbol. */
4453 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
4454 h = elf_sym_hashes (abfd)[indx];
4455 BFD_ASSERT (h != NULL);
4456 if (h->root.type == bfd_link_hash_defined
4457 || h->root.type == bfd_link_hash_defweak)
4458 targetsec = h->root.u.def.section;
4459 else
4460 targetsec = NULL;
4461 }
4462
4463 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
4464 memset (p + 4, 0, 8);
4465 if (targetsec != NULL)
4466 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
4467 }
4468
4469 if (symtab_hdr->contents != (unsigned char *) isymbuf)
4470 free (isymbuf);
4471 if (elf_section_data (datasec)->relocs != internal_relocs)
4472 free (internal_relocs);
4473 return true;
4474
4475 error_return:
4476 if (symtab_hdr->contents != (unsigned char *) isymbuf)
4477 free (isymbuf);
4478 if (elf_section_data (datasec)->relocs != internal_relocs)
4479 free (internal_relocs);
4480 return false;
4481 }
4482
4483 /* Set target options. */
4484
4485 void
bfd_elf_m68k_set_target_options(struct bfd_link_info * info,int got_handling)4486 bfd_elf_m68k_set_target_options (struct bfd_link_info *info, int got_handling)
4487 {
4488 struct elf_m68k_link_hash_table *htab;
4489 bool use_neg_got_offsets_p;
4490 bool allow_multigot_p;
4491 bool local_gp_p;
4492
4493 switch (got_handling)
4494 {
4495 case 0:
4496 /* --got=single. */
4497 local_gp_p = false;
4498 use_neg_got_offsets_p = false;
4499 allow_multigot_p = false;
4500 break;
4501
4502 case 1:
4503 /* --got=negative. */
4504 local_gp_p = true;
4505 use_neg_got_offsets_p = true;
4506 allow_multigot_p = false;
4507 break;
4508
4509 case 2:
4510 /* --got=multigot. */
4511 local_gp_p = true;
4512 use_neg_got_offsets_p = true;
4513 allow_multigot_p = true;
4514 break;
4515
4516 default:
4517 BFD_ASSERT (false);
4518 return;
4519 }
4520
4521 htab = elf_m68k_hash_table (info);
4522 if (htab != NULL)
4523 {
4524 htab->local_gp_p = local_gp_p;
4525 htab->use_neg_got_offsets_p = use_neg_got_offsets_p;
4526 htab->allow_multigot_p = allow_multigot_p;
4527 }
4528 }
4529
4530 static enum elf_reloc_type_class
elf32_m68k_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)4531 elf32_m68k_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4532 const asection *rel_sec ATTRIBUTE_UNUSED,
4533 const Elf_Internal_Rela *rela)
4534 {
4535 switch ((int) ELF32_R_TYPE (rela->r_info))
4536 {
4537 case R_68K_RELATIVE:
4538 return reloc_class_relative;
4539 case R_68K_JMP_SLOT:
4540 return reloc_class_plt;
4541 case R_68K_COPY:
4542 return reloc_class_copy;
4543 default:
4544 return reloc_class_normal;
4545 }
4546 }
4547
4548 /* Return address for Ith PLT stub in section PLT, for relocation REL
4549 or (bfd_vma) -1 if it should not be included. */
4550
4551 static bfd_vma
elf_m68k_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)4552 elf_m68k_plt_sym_val (bfd_vma i, const asection *plt,
4553 const arelent *rel ATTRIBUTE_UNUSED)
4554 {
4555 return plt->vma + (i + 1) * elf_m68k_get_plt_info (plt->owner)->size;
4556 }
4557
4558 /* Support for core dump NOTE sections. */
4559
4560 static bool
elf_m68k_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)4561 elf_m68k_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
4562 {
4563 int offset;
4564 size_t size;
4565
4566 switch (note->descsz)
4567 {
4568 default:
4569 return false;
4570
4571 case 154: /* Linux/m68k */
4572 /* pr_cursig */
4573 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
4574
4575 /* pr_pid */
4576 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 22);
4577
4578 /* pr_reg */
4579 offset = 70;
4580 size = 80;
4581
4582 break;
4583 }
4584
4585 /* Make a ".reg/999" section. */
4586 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
4587 size, note->descpos + offset);
4588 }
4589
4590 static bool
elf_m68k_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)4591 elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
4592 {
4593 switch (note->descsz)
4594 {
4595 default:
4596 return false;
4597
4598 case 124: /* Linux/m68k elf_prpsinfo. */
4599 elf_tdata (abfd)->core->pid
4600 = bfd_get_32 (abfd, note->descdata + 12);
4601 elf_tdata (abfd)->core->program
4602 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
4603 elf_tdata (abfd)->core->command
4604 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
4605 }
4606
4607 /* Note that for some reason, a spurious space is tacked
4608 onto the end of the args in some (at least one anyway)
4609 implementations, so strip it off if it exists. */
4610 {
4611 char *command = elf_tdata (abfd)->core->command;
4612 int n = strlen (command);
4613
4614 if (n > 0 && command[n - 1] == ' ')
4615 command[n - 1] = '\0';
4616 }
4617
4618 return true;
4619 }
4620
4621 #define TARGET_BIG_SYM m68k_elf32_vec
4622 #define TARGET_BIG_NAME "elf32-m68k"
4623 #define ELF_MACHINE_CODE EM_68K
4624 #define ELF_MAXPAGESIZE 0x2000
4625 #define elf_backend_create_dynamic_sections \
4626 _bfd_elf_create_dynamic_sections
4627 #define bfd_elf32_bfd_link_hash_table_create \
4628 elf_m68k_link_hash_table_create
4629 #define bfd_elf32_bfd_final_link bfd_elf_final_link
4630
4631 #define elf_backend_check_relocs elf_m68k_check_relocs
4632 #define elf_backend_early_size_sections \
4633 elf_m68k_early_size_sections
4634 #define elf_backend_adjust_dynamic_symbol \
4635 elf_m68k_adjust_dynamic_symbol
4636 #define elf_backend_late_size_sections elf_m68k_late_size_sections
4637 #define elf_backend_final_write_processing elf_m68k_final_write_processing
4638 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4639 #define elf_backend_relocate_section elf_m68k_relocate_section
4640 #define elf_backend_finish_dynamic_symbol \
4641 elf_m68k_finish_dynamic_symbol
4642 #define elf_backend_finish_dynamic_sections \
4643 elf_m68k_finish_dynamic_sections
4644 #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook
4645 #define elf_backend_copy_indirect_symbol elf_m68k_copy_indirect_symbol
4646 #define bfd_elf32_bfd_merge_private_bfd_data \
4647 elf32_m68k_merge_private_bfd_data
4648 #define bfd_elf32_bfd_set_private_flags \
4649 elf32_m68k_set_private_flags
4650 #define bfd_elf32_bfd_print_private_bfd_data \
4651 elf32_m68k_print_private_bfd_data
4652 #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class
4653 #define elf_backend_plt_sym_val elf_m68k_plt_sym_val
4654 #define elf_backend_object_p elf32_m68k_object_p
4655 #define elf_backend_grok_prstatus elf_m68k_grok_prstatus
4656 #define elf_backend_grok_psinfo elf_m68k_grok_psinfo
4657
4658 #define elf_backend_can_gc_sections 1
4659 #define elf_backend_can_refcount 1
4660 #define elf_backend_want_got_plt 1
4661 #define elf_backend_plt_readonly 1
4662 #define elf_backend_want_plt_sym 0
4663 #define elf_backend_got_header_size 12
4664 #define elf_backend_rela_normal 1
4665 #define elf_backend_dtrel_excludes_plt 1
4666
4667 #define elf_backend_linux_prpsinfo32_ugid16 true
4668
4669 #include "elf32-target.h"
4670