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0afcef53 | 1 | /* x86 specific support for ELF |
219d1afa | 2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
0afcef53 L |
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 "elfxx-x86.h" | |
a6798bab | 22 | #include "elf-vxworks.h" |
765e526c L |
23 | #include "objalloc.h" |
24 | #include "elf/i386.h" | |
25 | #include "elf/x86-64.h" | |
26 | ||
27 | /* The name of the dynamic interpreter. This is put in the .interp | |
28 | section. */ | |
29 | ||
30 | #define ELF32_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
31 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1" | |
32 | #define ELFX32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1" | |
0afcef53 | 33 | |
39946cc2 L |
34 | bfd_boolean |
35 | _bfd_x86_elf_mkobject (bfd *abfd) | |
36 | { | |
37 | return bfd_elf_allocate_object (abfd, | |
38 | sizeof (struct elf_x86_obj_tdata), | |
39 | get_elf_backend_data (abfd)->target_id); | |
40 | } | |
41 | ||
0afcef53 L |
42 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking |
43 | executables. Rather than setting it to the beginning of the TLS | |
44 | section, we have to set it to the end. This function may be called | |
45 | multiple times, it is idempotent. */ | |
46 | ||
47 | void | |
48 | _bfd_x86_elf_set_tls_module_base (struct bfd_link_info *info) | |
49 | { | |
50 | struct elf_x86_link_hash_table *htab; | |
51 | struct bfd_link_hash_entry *base; | |
52 | const struct elf_backend_data *bed; | |
53 | ||
54 | if (!bfd_link_executable (info)) | |
55 | return; | |
56 | ||
57 | bed = get_elf_backend_data (info->output_bfd); | |
58 | htab = elf_x86_hash_table (info, bed->target_id); | |
59 | if (htab == NULL) | |
60 | return; | |
61 | ||
62 | base = htab->tls_module_base; | |
63 | if (base == NULL) | |
64 | return; | |
65 | ||
66 | base->u.def.value = htab->elf.tls_size; | |
67 | } | |
68 | ||
69 | /* Return the base VMA address which should be subtracted from real addresses | |
70 | when resolving @dtpoff relocation. | |
71 | This is PT_TLS segment p_vaddr. */ | |
72 | ||
73 | bfd_vma | |
74 | _bfd_x86_elf_dtpoff_base (struct bfd_link_info *info) | |
75 | { | |
76 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
77 | if (elf_hash_table (info)->tls_sec == NULL) | |
78 | return 0; | |
79 | return elf_hash_table (info)->tls_sec->vma; | |
80 | } | |
81 | ||
b9ce864c L |
82 | /* Allocate space in .plt, .got and associated reloc sections for |
83 | dynamic relocs. */ | |
84 | ||
5e2ac45d | 85 | static bfd_boolean |
70090aa5 | 86 | elf_x86_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
b9ce864c L |
87 | { |
88 | struct bfd_link_info *info; | |
89 | struct elf_x86_link_hash_table *htab; | |
90 | struct elf_x86_link_hash_entry *eh; | |
91 | struct elf_dyn_relocs *p; | |
92 | unsigned int plt_entry_size; | |
93 | bfd_boolean resolved_to_zero; | |
94 | const struct elf_backend_data *bed; | |
95 | ||
96 | if (h->root.type == bfd_link_hash_indirect) | |
97 | return TRUE; | |
98 | ||
99 | eh = (struct elf_x86_link_hash_entry *) h; | |
100 | ||
101 | info = (struct bfd_link_info *) inf; | |
102 | bed = get_elf_backend_data (info->output_bfd); | |
103 | htab = elf_x86_hash_table (info, bed->target_id); | |
104 | if (htab == NULL) | |
105 | return FALSE; | |
106 | ||
107 | plt_entry_size = htab->plt.plt_entry_size; | |
108 | ||
c5bce5c6 | 109 | resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); |
b9ce864c | 110 | |
b9ce864c L |
111 | /* We can't use the GOT PLT if pointer equality is needed since |
112 | finish_dynamic_symbol won't clear symbol value and the dynamic | |
113 | linker won't update the GOT slot. We will get into an infinite | |
114 | loop at run-time. */ | |
115 | if (htab->plt_got != NULL | |
116 | && h->type != STT_GNU_IFUNC | |
117 | && !h->pointer_equality_needed | |
118 | && h->plt.refcount > 0 | |
119 | && h->got.refcount > 0) | |
120 | { | |
121 | /* Don't use the regular PLT if there are both GOT and GOTPLT | |
07d6d2b8 | 122 | reloctions. */ |
b9ce864c L |
123 | h->plt.offset = (bfd_vma) -1; |
124 | ||
125 | /* Use the GOT PLT. */ | |
126 | eh->plt_got.refcount = 1; | |
127 | } | |
128 | ||
129 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
130 | here if it is defined and referenced in a non-shared object. */ | |
131 | if (h->type == STT_GNU_IFUNC | |
132 | && h->def_regular) | |
133 | { | |
134 | if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, | |
135 | &htab->readonly_dynrelocs_against_ifunc, | |
136 | plt_entry_size, | |
137 | (htab->plt.has_plt0 | |
138 | * plt_entry_size), | |
139 | htab->got_entry_size, | |
140 | TRUE)) | |
141 | { | |
142 | asection *s = htab->plt_second; | |
143 | if (h->plt.offset != (bfd_vma) -1 && s != NULL) | |
144 | { | |
145 | /* Use the second PLT section if it is created. */ | |
146 | eh->plt_second.offset = s->size; | |
147 | ||
148 | /* Make room for this entry in the second PLT section. */ | |
149 | s->size += htab->non_lazy_plt->plt_entry_size; | |
150 | } | |
151 | ||
152 | return TRUE; | |
153 | } | |
154 | else | |
155 | return FALSE; | |
156 | } | |
157 | /* Don't create the PLT entry if there are only function pointer | |
158 | relocations which can be resolved at run-time. */ | |
159 | else if (htab->elf.dynamic_sections_created | |
79b0c981 | 160 | && (h->plt.refcount > 0 |
b9ce864c L |
161 | || eh->plt_got.refcount > 0)) |
162 | { | |
163 | bfd_boolean use_plt_got = eh->plt_got.refcount > 0; | |
164 | ||
b9ce864c L |
165 | /* Make sure this symbol is output as a dynamic symbol. |
166 | Undefined weak syms won't yet be marked as dynamic. */ | |
167 | if (h->dynindx == -1 | |
168 | && !h->forced_local | |
169 | && !resolved_to_zero | |
170 | && h->root.type == bfd_link_hash_undefweak) | |
171 | { | |
172 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
173 | return FALSE; | |
174 | } | |
175 | ||
176 | if (bfd_link_pic (info) | |
177 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) | |
178 | { | |
179 | asection *s = htab->elf.splt; | |
180 | asection *second_s = htab->plt_second; | |
181 | asection *got_s = htab->plt_got; | |
451875b4 | 182 | bfd_boolean use_plt; |
b9ce864c L |
183 | |
184 | /* If this is the first .plt entry, make room for the special | |
185 | first entry. The .plt section is used by prelink to undo | |
186 | prelinking for dynamic relocations. */ | |
187 | if (s->size == 0) | |
188 | s->size = htab->plt.has_plt0 * plt_entry_size; | |
189 | ||
190 | if (use_plt_got) | |
191 | eh->plt_got.offset = got_s->size; | |
192 | else | |
193 | { | |
194 | h->plt.offset = s->size; | |
195 | if (second_s) | |
196 | eh->plt_second.offset = second_s->size; | |
197 | } | |
198 | ||
199 | /* If this symbol is not defined in a regular file, and we are | |
451875b4 L |
200 | generating PDE, then set the symbol to this location in the |
201 | .plt. This is required to make function pointers compare | |
202 | as equal between PDE and the shared library. | |
203 | ||
204 | NB: If PLT is PC-relative, we can use the .plt in PIE for | |
205 | function address. */ | |
206 | if (h->def_regular) | |
207 | use_plt = FALSE; | |
208 | else if (htab->pcrel_plt) | |
209 | use_plt = ! bfd_link_dll (info); | |
210 | else | |
211 | use_plt = bfd_link_pde (info); | |
212 | if (use_plt) | |
b9ce864c L |
213 | { |
214 | if (use_plt_got) | |
215 | { | |
216 | /* We need to make a call to the entry of the GOT PLT | |
217 | instead of regular PLT entry. */ | |
218 | h->root.u.def.section = got_s; | |
219 | h->root.u.def.value = eh->plt_got.offset; | |
220 | } | |
221 | else | |
222 | { | |
223 | if (second_s) | |
224 | { | |
225 | /* We need to make a call to the entry of the | |
226 | second PLT instead of regular PLT entry. */ | |
227 | h->root.u.def.section = second_s; | |
228 | h->root.u.def.value = eh->plt_second.offset; | |
229 | } | |
230 | else | |
231 | { | |
232 | h->root.u.def.section = s; | |
233 | h->root.u.def.value = h->plt.offset; | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | /* Make room for this entry. */ | |
239 | if (use_plt_got) | |
240 | got_s->size += htab->non_lazy_plt->plt_entry_size; | |
241 | else | |
242 | { | |
243 | s->size += plt_entry_size; | |
244 | if (second_s) | |
245 | second_s->size += htab->non_lazy_plt->plt_entry_size; | |
246 | ||
247 | /* We also need to make an entry in the .got.plt section, | |
248 | which will be placed in the .got section by the linker | |
249 | script. */ | |
250 | htab->elf.sgotplt->size += htab->got_entry_size; | |
251 | ||
252 | /* There should be no PLT relocation against resolved | |
253 | undefined weak symbol in executable. */ | |
254 | if (!resolved_to_zero) | |
255 | { | |
256 | /* We also need to make an entry in the .rel.plt | |
257 | section. */ | |
258 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
259 | htab->elf.srelplt->reloc_count++; | |
260 | } | |
261 | } | |
262 | ||
851b6fa1 | 263 | if (htab->target_os == is_vxworks && !bfd_link_pic (info)) |
b9ce864c L |
264 | { |
265 | /* VxWorks has a second set of relocations for each PLT entry | |
266 | in executables. They go in a separate relocation section, | |
267 | which is processed by the kernel loader. */ | |
268 | ||
269 | /* There are two relocations for the initial PLT entry: an | |
270 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an | |
271 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ | |
272 | ||
273 | asection *srelplt2 = htab->srelplt2; | |
274 | if (h->plt.offset == plt_entry_size) | |
275 | srelplt2->size += (htab->sizeof_reloc * 2); | |
276 | ||
277 | /* There are two extra relocations for each subsequent PLT entry: | |
278 | an R_386_32 relocation for the GOT entry, and an R_386_32 | |
279 | relocation for the PLT entry. */ | |
280 | ||
281 | srelplt2->size += (htab->sizeof_reloc * 2); | |
282 | } | |
283 | } | |
284 | else | |
285 | { | |
286 | eh->plt_got.offset = (bfd_vma) -1; | |
287 | h->plt.offset = (bfd_vma) -1; | |
288 | h->needs_plt = 0; | |
289 | } | |
290 | } | |
291 | else | |
292 | { | |
293 | eh->plt_got.offset = (bfd_vma) -1; | |
294 | h->plt.offset = (bfd_vma) -1; | |
295 | h->needs_plt = 0; | |
296 | } | |
297 | ||
298 | eh->tlsdesc_got = (bfd_vma) -1; | |
299 | ||
300 | /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the | |
301 | binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For | |
302 | x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary, | |
303 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ | |
304 | if (h->got.refcount > 0 | |
305 | && bfd_link_executable (info) | |
306 | && h->dynindx == -1 | |
307 | && (elf_x86_hash_entry (h)->tls_type & GOT_TLS_IE)) | |
308 | h->got.offset = (bfd_vma) -1; | |
309 | else if (h->got.refcount > 0) | |
310 | { | |
311 | asection *s; | |
312 | bfd_boolean dyn; | |
313 | int tls_type = elf_x86_hash_entry (h)->tls_type; | |
314 | ||
315 | /* Make sure this symbol is output as a dynamic symbol. | |
316 | Undefined weak syms won't yet be marked as dynamic. */ | |
317 | if (h->dynindx == -1 | |
318 | && !h->forced_local | |
319 | && !resolved_to_zero | |
320 | && h->root.type == bfd_link_hash_undefweak) | |
321 | { | |
322 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
323 | return FALSE; | |
324 | } | |
325 | ||
326 | s = htab->elf.sgot; | |
327 | if (GOT_TLS_GDESC_P (tls_type)) | |
328 | { | |
329 | eh->tlsdesc_got = htab->elf.sgotplt->size | |
330 | - elf_x86_compute_jump_table_size (htab); | |
331 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
332 | h->got.offset = (bfd_vma) -2; | |
333 | } | |
334 | if (! GOT_TLS_GDESC_P (tls_type) | |
335 | || GOT_TLS_GD_P (tls_type)) | |
336 | { | |
337 | h->got.offset = s->size; | |
338 | s->size += htab->got_entry_size; | |
339 | /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT | |
340 | slots. */ | |
341 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) | |
342 | s->size += htab->got_entry_size; | |
343 | } | |
344 | dyn = htab->elf.dynamic_sections_created; | |
345 | /* R_386_TLS_IE_32 needs one dynamic relocation, | |
346 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, | |
347 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we | |
348 | need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local | |
349 | symbol and two if global. No dynamic relocation against | |
350 | resolved undefined weak symbol in executable. */ | |
351 | if (tls_type == GOT_TLS_IE_BOTH) | |
352 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
353 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) | |
354 | || (tls_type & GOT_TLS_IE)) | |
355 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
356 | else if (GOT_TLS_GD_P (tls_type)) | |
357 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
358 | else if (! GOT_TLS_GDESC_P (tls_type) | |
359 | && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
360 | && !resolved_to_zero) | |
361 | || h->root.type != bfd_link_hash_undefweak) | |
362 | && (bfd_link_pic (info) | |
363 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) | |
364 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
365 | if (GOT_TLS_GDESC_P (tls_type)) | |
0e30d991 L |
366 | { |
367 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
368 | if (bed->target_id == X86_64_ELF_DATA) | |
369 | htab->tlsdesc_plt = (bfd_vma) -1; | |
370 | } | |
b9ce864c L |
371 | } |
372 | else | |
373 | h->got.offset = (bfd_vma) -1; | |
374 | ||
375 | if (eh->dyn_relocs == NULL) | |
376 | return TRUE; | |
377 | ||
378 | /* In the shared -Bsymbolic case, discard space allocated for | |
379 | dynamic pc-relative relocs against symbols which turn out to be | |
380 | defined in regular objects. For the normal shared case, discard | |
381 | space for pc-relative relocs that have become local due to symbol | |
382 | visibility changes. */ | |
383 | ||
384 | if (bfd_link_pic (info)) | |
385 | { | |
386 | /* Relocs that use pc_count are those that appear on a call | |
387 | insn, or certain REL relocs that can generated via assembly. | |
388 | We want calls to protected symbols to resolve directly to the | |
389 | function rather than going via the plt. If people want | |
390 | function pointer comparisons to work as expected then they | |
391 | should avoid writing weird assembly. */ | |
392 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
393 | { | |
394 | struct elf_dyn_relocs **pp; | |
395 | ||
396 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
397 | { | |
398 | p->count -= p->pc_count; | |
399 | p->pc_count = 0; | |
400 | if (p->count == 0) | |
401 | *pp = p->next; | |
402 | else | |
403 | pp = &p->next; | |
404 | } | |
405 | } | |
406 | ||
851b6fa1 | 407 | if (htab->target_os == is_vxworks) |
b9ce864c L |
408 | { |
409 | struct elf_dyn_relocs **pp; | |
410 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
411 | { | |
412 | if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) | |
413 | *pp = p->next; | |
414 | else | |
415 | pp = &p->next; | |
416 | } | |
417 | } | |
418 | ||
419 | /* Also discard relocs on undefined weak syms with non-default | |
420 | visibility or in PIE. */ | |
421 | if (eh->dyn_relocs != NULL) | |
422 | { | |
423 | if (h->root.type == bfd_link_hash_undefweak) | |
424 | { | |
425 | /* Undefined weak symbol is never bound locally in shared | |
426 | library. */ | |
427 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
428 | || resolved_to_zero) | |
429 | { | |
430 | if (bed->target_id == I386_ELF_DATA | |
431 | && h->non_got_ref) | |
432 | { | |
433 | /* Keep dynamic non-GOT/non-PLT relocation so | |
434 | that we can branch to 0 without PLT. */ | |
435 | struct elf_dyn_relocs **pp; | |
436 | ||
437 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
438 | if (p->pc_count == 0) | |
439 | *pp = p->next; | |
440 | else | |
441 | { | |
442 | /* Remove non-R_386_PC32 relocation. */ | |
443 | p->count = p->pc_count; | |
444 | pp = &p->next; | |
445 | } | |
446 | ||
447 | /* Make sure undefined weak symbols are output | |
448 | as dynamic symbols in PIEs for dynamic non-GOT | |
449 | non-PLT reloations. */ | |
450 | if (eh->dyn_relocs != NULL | |
451 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
452 | return FALSE; | |
453 | } | |
454 | else | |
455 | eh->dyn_relocs = NULL; | |
456 | } | |
457 | else if (h->dynindx == -1 | |
458 | && !h->forced_local | |
459 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
460 | return FALSE; | |
461 | } | |
462 | else if (bfd_link_executable (info) | |
463 | && (h->needs_copy || eh->needs_copy) | |
464 | && h->def_dynamic | |
465 | && !h->def_regular) | |
466 | { | |
467 | /* NB: needs_copy is set only for x86-64. For PIE, | |
468 | discard space for pc-relative relocs against symbols | |
469 | which turn out to need copy relocs. */ | |
470 | struct elf_dyn_relocs **pp; | |
471 | ||
472 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
473 | { | |
474 | if (p->pc_count != 0) | |
475 | *pp = p->next; | |
476 | else | |
477 | pp = &p->next; | |
478 | } | |
479 | } | |
480 | } | |
481 | } | |
482 | else if (ELIMINATE_COPY_RELOCS) | |
483 | { | |
484 | /* For the non-shared case, discard space for relocs against | |
485 | symbols which turn out to need copy relocs or are not | |
486 | dynamic. Keep dynamic relocations for run-time function | |
487 | pointer initialization. */ | |
488 | ||
489 | if ((!h->non_got_ref | |
b9ce864c L |
490 | || (h->root.type == bfd_link_hash_undefweak |
491 | && !resolved_to_zero)) | |
492 | && ((h->def_dynamic | |
493 | && !h->def_regular) | |
494 | || (htab->elf.dynamic_sections_created | |
495 | && (h->root.type == bfd_link_hash_undefweak | |
496 | || h->root.type == bfd_link_hash_undefined)))) | |
497 | { | |
498 | /* Make sure this symbol is output as a dynamic symbol. | |
499 | Undefined weak syms won't yet be marked as dynamic. */ | |
500 | if (h->dynindx == -1 | |
501 | && !h->forced_local | |
502 | && !resolved_to_zero | |
503 | && h->root.type == bfd_link_hash_undefweak | |
504 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
505 | return FALSE; | |
506 | ||
507 | /* If that succeeded, we know we'll be keeping all the | |
508 | relocs. */ | |
509 | if (h->dynindx != -1) | |
510 | goto keep; | |
511 | } | |
512 | ||
513 | eh->dyn_relocs = NULL; | |
b9ce864c L |
514 | |
515 | keep: ; | |
516 | } | |
517 | ||
518 | /* Finally, allocate space. */ | |
519 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
520 | { | |
521 | asection *sreloc; | |
522 | ||
523 | sreloc = elf_section_data (p->sec)->sreloc; | |
524 | ||
525 | BFD_ASSERT (sreloc != NULL); | |
526 | sreloc->size += p->count * htab->sizeof_reloc; | |
527 | } | |
528 | ||
529 | return TRUE; | |
530 | } | |
531 | ||
826c3f1e | 532 | /* Find dynamic relocs for H that apply to read-only sections. */ |
0afcef53 | 533 | |
826c3f1e AM |
534 | static asection * |
535 | readonly_dynrelocs (struct elf_link_hash_entry *h) | |
0afcef53 | 536 | { |
0afcef53 L |
537 | struct elf_dyn_relocs *p; |
538 | ||
826c3f1e | 539 | for (p = elf_x86_hash_entry (h)->dyn_relocs; p != NULL; p = p->next) |
0afcef53 L |
540 | { |
541 | asection *s = p->sec->output_section; | |
542 | ||
543 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
826c3f1e AM |
544 | return p->sec; |
545 | } | |
546 | return NULL; | |
547 | } | |
0afcef53 | 548 | |
826c3f1e AM |
549 | /* Set DF_TEXTREL if we find any dynamic relocs that apply to |
550 | read-only sections. */ | |
0afcef53 | 551 | |
826c3f1e AM |
552 | static bfd_boolean |
553 | maybe_set_textrel (struct elf_link_hash_entry *h, void *inf) | |
554 | { | |
555 | asection *sec; | |
0afcef53 | 556 | |
826c3f1e AM |
557 | if (h->root.type == bfd_link_hash_indirect) |
558 | return TRUE; | |
559 | ||
560 | /* Skip local IFUNC symbols. */ | |
561 | if (h->forced_local && h->type == STT_GNU_IFUNC) | |
562 | return TRUE; | |
563 | ||
564 | sec = readonly_dynrelocs (h); | |
565 | if (sec != NULL) | |
566 | { | |
567 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
568 | ||
569 | info->flags |= DF_TEXTREL; | |
570 | /* xgettext:c-format */ | |
c1c8c1ef | 571 | info->callbacks->minfo (_("%pB: dynamic relocation against `%pT' " |
871b3ab2 | 572 | "in read-only section `%pA'\n"), |
826c3f1e AM |
573 | sec->owner, h->root.root.string, sec); |
574 | ||
575 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
576 | || info->error_textrel) | |
577 | /* xgettext:c-format */ | |
871b3ab2 AM |
578 | info->callbacks->einfo (_("%P: %pB: warning: relocation against `%s' " |
579 | "in read-only section `%pA'\n"), | |
826c3f1e AM |
580 | sec->owner, h->root.root.string, sec); |
581 | ||
582 | /* Not an error, just cut short the traversal. */ | |
583 | return FALSE; | |
0afcef53 L |
584 | } |
585 | return TRUE; | |
586 | } | |
587 | ||
b9ce864c L |
588 | /* Allocate space in .plt, .got and associated reloc sections for |
589 | local dynamic relocs. */ | |
590 | ||
5e2ac45d L |
591 | static bfd_boolean |
592 | elf_x86_allocate_local_dynreloc (void **slot, void *inf) | |
b9ce864c L |
593 | { |
594 | struct elf_link_hash_entry *h | |
595 | = (struct elf_link_hash_entry *) *slot; | |
596 | ||
597 | if (h->type != STT_GNU_IFUNC | |
598 | || !h->def_regular | |
599 | || !h->ref_regular | |
600 | || !h->forced_local | |
601 | || h->root.type != bfd_link_hash_defined) | |
602 | abort (); | |
603 | ||
5e2ac45d | 604 | return elf_x86_allocate_dynrelocs (h, inf); |
b9ce864c L |
605 | } |
606 | ||
0afcef53 L |
607 | /* Find and/or create a hash entry for local symbol. */ |
608 | ||
609 | struct elf_link_hash_entry * | |
610 | _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab, | |
611 | bfd *abfd, const Elf_Internal_Rela *rel, | |
612 | bfd_boolean create) | |
613 | { | |
614 | struct elf_x86_link_hash_entry e, *ret; | |
615 | asection *sec = abfd->sections; | |
616 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
617 | htab->r_sym (rel->r_info)); | |
618 | void **slot; | |
619 | ||
620 | e.elf.indx = sec->id; | |
621 | e.elf.dynstr_index = htab->r_sym (rel->r_info); | |
622 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
623 | create ? INSERT : NO_INSERT); | |
624 | ||
625 | if (!slot) | |
626 | return NULL; | |
627 | ||
628 | if (*slot) | |
629 | { | |
630 | ret = (struct elf_x86_link_hash_entry *) *slot; | |
631 | return &ret->elf; | |
632 | } | |
633 | ||
634 | ret = (struct elf_x86_link_hash_entry *) | |
635 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
636 | sizeof (struct elf_x86_link_hash_entry)); | |
637 | if (ret) | |
638 | { | |
639 | memset (ret, 0, sizeof (*ret)); | |
640 | ret->elf.indx = sec->id; | |
641 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); | |
642 | ret->elf.dynindx = -1; | |
643 | ret->plt_got.offset = (bfd_vma) -1; | |
644 | *slot = ret; | |
645 | } | |
646 | return &ret->elf; | |
647 | } | |
648 | ||
649 | /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN | |
650 | SYNC WITH _bfd_elf_link_hash_newfunc. */ | |
651 | ||
652 | struct bfd_hash_entry * | |
653 | _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry, | |
654 | struct bfd_hash_table *table, | |
655 | const char *string) | |
656 | { | |
657 | /* Allocate the structure if it has not already been allocated by a | |
658 | subclass. */ | |
659 | if (entry == NULL) | |
660 | { | |
661 | entry = (struct bfd_hash_entry *) | |
662 | bfd_hash_allocate (table, | |
663 | sizeof (struct elf_x86_link_hash_entry)); | |
664 | if (entry == NULL) | |
665 | return entry; | |
666 | } | |
667 | ||
668 | /* Call the allocation method of the superclass. */ | |
669 | entry = _bfd_link_hash_newfunc (entry, table, string); | |
670 | if (entry != NULL) | |
671 | { | |
672 | struct elf_x86_link_hash_entry *eh | |
673 | = (struct elf_x86_link_hash_entry *) entry; | |
674 | struct elf_link_hash_table *htab | |
675 | = (struct elf_link_hash_table *) table; | |
676 | ||
677 | memset (&eh->elf.size, 0, | |
678 | (sizeof (struct elf_x86_link_hash_entry) | |
679 | - offsetof (struct elf_link_hash_entry, size))); | |
680 | /* Set local fields. */ | |
681 | eh->elf.indx = -1; | |
682 | eh->elf.dynindx = -1; | |
683 | eh->elf.got = htab->init_got_refcount; | |
684 | eh->elf.plt = htab->init_plt_refcount; | |
685 | /* Assume that we have been called by a non-ELF symbol reader. | |
686 | This flag is then reset by the code which reads an ELF input | |
687 | file. This ensures that a symbol created by a non-ELF symbol | |
688 | reader will have the flag set correctly. */ | |
689 | eh->elf.non_elf = 1; | |
690 | eh->plt_second.offset = (bfd_vma) -1; | |
691 | eh->plt_got.offset = (bfd_vma) -1; | |
692 | eh->tlsdesc_got = (bfd_vma) -1; | |
98b273dc | 693 | eh->zero_undefweak = 1; |
0afcef53 L |
694 | } |
695 | ||
696 | return entry; | |
697 | } | |
698 | ||
699 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
700 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
701 | as global symbol. We reuse indx and dynstr_index for local symbol | |
702 | hash since they aren't used by global symbols in this backend. */ | |
703 | ||
704 | hashval_t | |
705 | _bfd_x86_elf_local_htab_hash (const void *ptr) | |
706 | { | |
707 | struct elf_link_hash_entry *h | |
708 | = (struct elf_link_hash_entry *) ptr; | |
709 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
710 | } | |
711 | ||
712 | /* Compare local hash entries. */ | |
713 | ||
714 | int | |
715 | _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
716 | { | |
717 | struct elf_link_hash_entry *h1 | |
718 | = (struct elf_link_hash_entry *) ptr1; | |
719 | struct elf_link_hash_entry *h2 | |
720 | = (struct elf_link_hash_entry *) ptr2; | |
721 | ||
722 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
723 | } | |
724 | ||
725 | /* Destroy an x86 ELF linker hash table. */ | |
726 | ||
765e526c L |
727 | static void |
728 | elf_x86_link_hash_table_free (bfd *obfd) | |
0afcef53 L |
729 | { |
730 | struct elf_x86_link_hash_table *htab | |
731 | = (struct elf_x86_link_hash_table *) obfd->link.hash; | |
732 | ||
733 | if (htab->loc_hash_table) | |
734 | htab_delete (htab->loc_hash_table); | |
735 | if (htab->loc_hash_memory) | |
736 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
737 | _bfd_elf_link_hash_table_free (obfd); | |
738 | } | |
739 | ||
5e2ac45d L |
740 | static bfd_boolean |
741 | elf_i386_is_reloc_section (const char *secname) | |
742 | { | |
743 | return CONST_STRNEQ (secname, ".rel"); | |
744 | } | |
745 | ||
5e2ac45d L |
746 | static bfd_boolean |
747 | elf_x86_64_is_reloc_section (const char *secname) | |
748 | { | |
749 | return CONST_STRNEQ (secname, ".rela"); | |
750 | } | |
5e2ac45d | 751 | |
765e526c L |
752 | /* Create an x86 ELF linker hash table. */ |
753 | ||
754 | struct bfd_link_hash_table * | |
755 | _bfd_x86_elf_link_hash_table_create (bfd *abfd) | |
756 | { | |
757 | struct elf_x86_link_hash_table *ret; | |
758 | const struct elf_backend_data *bed; | |
759 | bfd_size_type amt = sizeof (struct elf_x86_link_hash_table); | |
760 | ||
761 | ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt); | |
762 | if (ret == NULL) | |
763 | return NULL; | |
764 | ||
765 | bed = get_elf_backend_data (abfd); | |
766 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
767 | _bfd_x86_elf_link_hash_newfunc, | |
768 | sizeof (struct elf_x86_link_hash_entry), | |
769 | bed->target_id)) | |
770 | { | |
771 | free (ret); | |
772 | return NULL; | |
773 | } | |
774 | ||
5e2ac45d L |
775 | if (bed->target_id == X86_64_ELF_DATA) |
776 | { | |
5e2ac45d L |
777 | ret->is_reloc_section = elf_x86_64_is_reloc_section; |
778 | ret->dt_reloc = DT_RELA; | |
779 | ret->dt_reloc_sz = DT_RELASZ; | |
780 | ret->dt_reloc_ent = DT_RELAENT; | |
781 | ret->got_entry_size = 8; | |
451875b4 | 782 | ret->pcrel_plt = TRUE; |
f04bdfa7 | 783 | ret->tls_get_addr = "__tls_get_addr"; |
5e2ac45d | 784 | } |
765e526c L |
785 | if (ABI_64_P (abfd)) |
786 | { | |
503294e7 | 787 | ret->sizeof_reloc = sizeof (Elf64_External_Rela); |
765e526c L |
788 | ret->pointer_r_type = R_X86_64_64; |
789 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; | |
790 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; | |
765e526c L |
791 | } |
792 | else | |
765e526c | 793 | { |
5b86dbf4 | 794 | if (bed->target_id == X86_64_ELF_DATA) |
765e526c | 795 | { |
503294e7 | 796 | ret->sizeof_reloc = sizeof (Elf32_External_Rela); |
765e526c L |
797 | ret->pointer_r_type = R_X86_64_32; |
798 | ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER; | |
799 | ret->dynamic_interpreter_size | |
800 | = sizeof ELFX32_DYNAMIC_INTERPRETER; | |
765e526c L |
801 | } |
802 | else | |
803 | { | |
5e2ac45d L |
804 | ret->is_reloc_section = elf_i386_is_reloc_section; |
805 | ret->dt_reloc = DT_REL; | |
806 | ret->dt_reloc_sz = DT_RELSZ; | |
807 | ret->dt_reloc_ent = DT_RELENT; | |
503294e7 | 808 | ret->sizeof_reloc = sizeof (Elf32_External_Rel); |
9ff114ca | 809 | ret->got_entry_size = 4; |
451875b4 | 810 | ret->pcrel_plt = FALSE; |
765e526c L |
811 | ret->pointer_r_type = R_386_32; |
812 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; | |
813 | ret->dynamic_interpreter_size | |
814 | = sizeof ELF32_DYNAMIC_INTERPRETER; | |
815 | ret->tls_get_addr = "___tls_get_addr"; | |
816 | } | |
817 | } | |
fe53b4a4 | 818 | ret->target_id = bed->target_id; |
851b6fa1 | 819 | ret->target_os = get_elf_x86_backend_data (abfd)->target_os; |
765e526c L |
820 | |
821 | ret->loc_hash_table = htab_try_create (1024, | |
822 | _bfd_x86_elf_local_htab_hash, | |
823 | _bfd_x86_elf_local_htab_eq, | |
824 | NULL); | |
825 | ret->loc_hash_memory = objalloc_create (); | |
826 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
827 | { | |
828 | elf_x86_link_hash_table_free (abfd); | |
829 | return NULL; | |
830 | } | |
831 | ret->elf.root.hash_table_free = elf_x86_link_hash_table_free; | |
832 | ||
833 | return &ret->elf.root; | |
834 | } | |
835 | ||
0afcef53 L |
836 | /* Sort relocs into address order. */ |
837 | ||
838 | int | |
839 | _bfd_x86_elf_compare_relocs (const void *ap, const void *bp) | |
840 | { | |
841 | const arelent *a = * (const arelent **) ap; | |
842 | const arelent *b = * (const arelent **) bp; | |
843 | ||
844 | if (a->address > b->address) | |
845 | return 1; | |
846 | else if (a->address < b->address) | |
847 | return -1; | |
848 | else | |
849 | return 0; | |
850 | } | |
851 | ||
9bc935ef L |
852 | /* Mark symbol, NAME, as locally defined by linker if it is referenced |
853 | and not defined in a relocatable object file. */ | |
854 | ||
855 | static void | |
856 | elf_x86_linker_defined (struct bfd_link_info *info, const char *name) | |
857 | { | |
858 | struct elf_link_hash_entry *h; | |
859 | ||
860 | h = elf_link_hash_lookup (elf_hash_table (info), name, | |
861 | FALSE, FALSE, FALSE); | |
862 | if (h == NULL) | |
863 | return; | |
864 | ||
865 | while (h->root.type == bfd_link_hash_indirect) | |
866 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
867 | ||
868 | if (h->root.type == bfd_link_hash_new | |
869 | || h->root.type == bfd_link_hash_undefined | |
870 | || h->root.type == bfd_link_hash_undefweak | |
871 | || h->root.type == bfd_link_hash_common | |
872 | || (!h->def_regular && h->def_dynamic)) | |
873 | { | |
874 | elf_x86_hash_entry (h)->local_ref = 2; | |
875 | elf_x86_hash_entry (h)->linker_def = 1; | |
876 | } | |
877 | } | |
878 | ||
ecf99cc0 L |
879 | /* Hide a linker-defined symbol, NAME, with hidden visibility. */ |
880 | ||
881 | static void | |
882 | elf_x86_hide_linker_defined (struct bfd_link_info *info, | |
883 | const char *name) | |
884 | { | |
885 | struct elf_link_hash_entry *h; | |
886 | ||
887 | h = elf_link_hash_lookup (elf_hash_table (info), name, | |
888 | FALSE, FALSE, FALSE); | |
889 | if (h == NULL) | |
890 | return; | |
891 | ||
892 | while (h->root.type == bfd_link_hash_indirect) | |
893 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
894 | ||
895 | if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL | |
896 | || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) | |
897 | _bfd_elf_link_hash_hide_symbol (info, h, TRUE); | |
898 | } | |
899 | ||
0afcef53 L |
900 | bfd_boolean |
901 | _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info) | |
902 | { | |
903 | if (!bfd_link_relocatable (info)) | |
904 | { | |
905 | /* Check for __tls_get_addr reference. */ | |
906 | struct elf_x86_link_hash_table *htab; | |
907 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
908 | htab = elf_x86_hash_table (info, bed->target_id); | |
909 | if (htab) | |
910 | { | |
0a27fed7 L |
911 | struct elf_link_hash_entry *h; |
912 | ||
913 | h = elf_link_hash_lookup (elf_hash_table (info), | |
0afcef53 L |
914 | htab->tls_get_addr, |
915 | FALSE, FALSE, FALSE); | |
916 | if (h != NULL) | |
8a1b824a L |
917 | { |
918 | elf_x86_hash_entry (h)->tls_get_addr = 1; | |
919 | ||
920 | /* Check the versioned __tls_get_addr symbol. */ | |
921 | while (h->root.type == bfd_link_hash_indirect) | |
922 | { | |
923 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
924 | elf_x86_hash_entry (h)->tls_get_addr = 1; | |
925 | } | |
926 | } | |
0a27fed7 L |
927 | |
928 | /* "__ehdr_start" will be defined by linker as a hidden symbol | |
929 | later if it is referenced and not defined. */ | |
9bc935ef L |
930 | elf_x86_linker_defined (info, "__ehdr_start"); |
931 | ||
932 | if (bfd_link_executable (info)) | |
0a27fed7 | 933 | { |
9bc935ef L |
934 | /* References to __bss_start, _end and _edata should be |
935 | locally resolved within executables. */ | |
936 | elf_x86_linker_defined (info, "__bss_start"); | |
937 | elf_x86_linker_defined (info, "_end"); | |
938 | elf_x86_linker_defined (info, "_edata"); | |
ecf99cc0 L |
939 | } |
940 | else | |
941 | { | |
942 | /* Hide hidden __bss_start, _end and _edata in shared | |
943 | libraries. */ | |
944 | elf_x86_hide_linker_defined (info, "__bss_start"); | |
945 | elf_x86_hide_linker_defined (info, "_end"); | |
946 | elf_x86_hide_linker_defined (info, "_edata"); | |
0a27fed7 | 947 | } |
0afcef53 L |
948 | } |
949 | } | |
950 | ||
951 | /* Invoke the regular ELF backend linker to do all the work. */ | |
952 | return _bfd_elf_link_check_relocs (abfd, info); | |
953 | } | |
954 | ||
5e2ac45d L |
955 | /* Set the sizes of the dynamic sections. */ |
956 | ||
957 | bfd_boolean | |
958 | _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd, | |
959 | struct bfd_link_info *info) | |
960 | { | |
961 | struct elf_x86_link_hash_table *htab; | |
962 | bfd *dynobj; | |
963 | asection *s; | |
964 | bfd_boolean relocs; | |
965 | bfd *ibfd; | |
966 | const struct elf_backend_data *bed | |
967 | = get_elf_backend_data (output_bfd); | |
968 | ||
969 | htab = elf_x86_hash_table (info, bed->target_id); | |
970 | if (htab == NULL) | |
971 | return FALSE; | |
972 | dynobj = htab->elf.dynobj; | |
973 | if (dynobj == NULL) | |
974 | abort (); | |
975 | ||
976 | /* Set up .got offsets for local syms, and space for local dynamic | |
977 | relocs. */ | |
978 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
979 | { | |
980 | bfd_signed_vma *local_got; | |
981 | bfd_signed_vma *end_local_got; | |
982 | char *local_tls_type; | |
983 | bfd_vma *local_tlsdesc_gotent; | |
984 | bfd_size_type locsymcount; | |
985 | Elf_Internal_Shdr *symtab_hdr; | |
986 | asection *srel; | |
987 | ||
988 | if (! is_x86_elf (ibfd, htab)) | |
989 | continue; | |
990 | ||
991 | for (s = ibfd->sections; s != NULL; s = s->next) | |
992 | { | |
993 | struct elf_dyn_relocs *p; | |
994 | ||
5e2ac45d L |
995 | for (p = ((struct elf_dyn_relocs *) |
996 | elf_section_data (s)->local_dynrel); | |
997 | p != NULL; | |
998 | p = p->next) | |
999 | { | |
1000 | if (!bfd_is_abs_section (p->sec) | |
1001 | && bfd_is_abs_section (p->sec->output_section)) | |
1002 | { | |
1003 | /* Input section has been discarded, either because | |
1004 | it is a copy of a linkonce section or due to | |
1005 | linker script /DISCARD/, so we'll be discarding | |
1006 | the relocs too. */ | |
1007 | } | |
851b6fa1 | 1008 | else if (htab->target_os == is_vxworks |
5e2ac45d L |
1009 | && strcmp (p->sec->output_section->name, |
1010 | ".tls_vars") == 0) | |
1011 | { | |
1012 | /* Relocations in vxworks .tls_vars sections are | |
1013 | handled specially by the loader. */ | |
1014 | } | |
1015 | else if (p->count != 0) | |
1016 | { | |
1017 | srel = elf_section_data (p->sec)->sreloc; | |
1018 | srel->size += p->count * htab->sizeof_reloc; | |
1019 | if ((p->sec->output_section->flags & SEC_READONLY) != 0 | |
1020 | && (info->flags & DF_TEXTREL) == 0) | |
1021 | { | |
1022 | info->flags |= DF_TEXTREL; | |
1023 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
1024 | || info->error_textrel) | |
1025 | /* xgettext:c-format */ | |
826c3f1e | 1026 | info->callbacks->einfo |
871b3ab2 AM |
1027 | (_("%P: %pB: warning: relocation " |
1028 | "in read-only section `%pA'\n"), | |
826c3f1e | 1029 | p->sec->owner, p->sec); |
5e2ac45d L |
1030 | } |
1031 | } | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | local_got = elf_local_got_refcounts (ibfd); | |
1036 | if (!local_got) | |
1037 | continue; | |
1038 | ||
1039 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
1040 | locsymcount = symtab_hdr->sh_info; | |
1041 | end_local_got = local_got + locsymcount; | |
1042 | local_tls_type = elf_x86_local_got_tls_type (ibfd); | |
1043 | local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd); | |
1044 | s = htab->elf.sgot; | |
1045 | srel = htab->elf.srelgot; | |
1046 | for (; local_got < end_local_got; | |
1047 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) | |
1048 | { | |
1049 | *local_tlsdesc_gotent = (bfd_vma) -1; | |
1050 | if (*local_got > 0) | |
1051 | { | |
1052 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
1053 | { | |
1054 | *local_tlsdesc_gotent = htab->elf.sgotplt->size | |
1055 | - elf_x86_compute_jump_table_size (htab); | |
1056 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
1057 | *local_got = (bfd_vma) -2; | |
1058 | } | |
1059 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
1060 | || GOT_TLS_GD_P (*local_tls_type)) | |
1061 | { | |
1062 | *local_got = s->size; | |
1063 | s->size += htab->got_entry_size; | |
1064 | if (GOT_TLS_GD_P (*local_tls_type) | |
1065 | || *local_tls_type == GOT_TLS_IE_BOTH) | |
1066 | s->size += htab->got_entry_size; | |
1067 | } | |
1068 | if (bfd_link_pic (info) | |
1069 | || GOT_TLS_GD_ANY_P (*local_tls_type) | |
1070 | || (*local_tls_type & GOT_TLS_IE)) | |
1071 | { | |
1072 | if (*local_tls_type == GOT_TLS_IE_BOTH) | |
1073 | srel->size += 2 * htab->sizeof_reloc; | |
1074 | else if (GOT_TLS_GD_P (*local_tls_type) | |
1075 | || ! GOT_TLS_GDESC_P (*local_tls_type)) | |
1076 | srel->size += htab->sizeof_reloc; | |
1077 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
1078 | { | |
1079 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
1080 | if (bed->target_id == X86_64_ELF_DATA) | |
1081 | htab->tlsdesc_plt = (bfd_vma) -1; | |
1082 | } | |
1083 | } | |
1084 | } | |
1085 | else | |
1086 | *local_got = (bfd_vma) -1; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | if (htab->tls_ld_or_ldm_got.refcount > 0) | |
1091 | { | |
1092 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM | |
07d6d2b8 | 1093 | or R_X86_64_TLSLD relocs. */ |
5e2ac45d L |
1094 | htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size; |
1095 | htab->elf.sgot->size += 2 * htab->got_entry_size; | |
1096 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
1097 | } | |
1098 | else | |
1099 | htab->tls_ld_or_ldm_got.offset = -1; | |
1100 | ||
1101 | /* Allocate global sym .plt and .got entries, and space for global | |
1102 | sym dynamic relocs. */ | |
1103 | elf_link_hash_traverse (&htab->elf, elf_x86_allocate_dynrelocs, | |
1104 | info); | |
1105 | ||
1106 | /* Allocate .plt and .got entries, and space for local symbols. */ | |
1107 | htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc, | |
1108 | info); | |
1109 | ||
1110 | /* For every jump slot reserved in the sgotplt, reloc_count is | |
1111 | incremented. However, when we reserve space for TLS descriptors, | |
1112 | it's not incremented, so in order to compute the space reserved | |
1113 | for them, it suffices to multiply the reloc count by the jump | |
1114 | slot size. | |
1115 | ||
1116 | PR ld/13302: We start next_irelative_index at the end of .rela.plt | |
1117 | so that R_{386,X86_64}_IRELATIVE entries come last. */ | |
1118 | if (htab->elf.srelplt) | |
1119 | { | |
1120 | htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; | |
1121 | htab->sgotplt_jump_table_size | |
1122 | = elf_x86_compute_jump_table_size (htab); | |
1123 | htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; | |
1124 | } | |
1125 | else if (htab->elf.irelplt) | |
1126 | htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; | |
1127 | ||
1128 | if (htab->tlsdesc_plt) | |
1129 | { | |
1130 | /* NB: tlsdesc_plt is set only for x86-64. If we're not using | |
1131 | lazy TLS relocations, don't generate the PLT and GOT entries | |
1132 | they require. */ | |
1133 | if ((info->flags & DF_BIND_NOW)) | |
1134 | htab->tlsdesc_plt = 0; | |
1135 | else | |
1136 | { | |
1137 | htab->tlsdesc_got = htab->elf.sgot->size; | |
1138 | htab->elf.sgot->size += htab->got_entry_size; | |
1139 | /* Reserve room for the initial entry. | |
1140 | FIXME: we could probably do away with it in this case. */ | |
1141 | if (htab->elf.splt->size == 0) | |
1142 | htab->elf.splt->size = htab->plt.plt_entry_size; | |
1143 | htab->tlsdesc_plt = htab->elf.splt->size; | |
1144 | htab->elf.splt->size += htab->plt.plt_entry_size; | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | if (htab->elf.sgotplt) | |
1149 | { | |
1150 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1151 | entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */ | |
1152 | if ((htab->elf.hgot == NULL | |
cd048363 | 1153 | || !htab->got_referenced) |
5e2ac45d L |
1154 | && (htab->elf.sgotplt->size == bed->got_header_size) |
1155 | && (htab->elf.splt == NULL | |
1156 | || htab->elf.splt->size == 0) | |
1157 | && (htab->elf.sgot == NULL | |
1158 | || htab->elf.sgot->size == 0) | |
1159 | && (htab->elf.iplt == NULL | |
1160 | || htab->elf.iplt->size == 0) | |
1161 | && (htab->elf.igotplt == NULL | |
1162 | || htab->elf.igotplt->size == 0)) | |
cd048363 L |
1163 | { |
1164 | htab->elf.sgotplt->size = 0; | |
3b4c3844 L |
1165 | /* Solaris requires to keep _GLOBAL_OFFSET_TABLE_ even if it |
1166 | isn't used. */ | |
1167 | if (htab->elf.hgot != NULL && htab->target_os != is_solaris) | |
cd048363 L |
1168 | { |
1169 | /* Remove the unused _GLOBAL_OFFSET_TABLE_ from symbol | |
1170 | table. */ | |
1171 | htab->elf.hgot->root.type = bfd_link_hash_undefined; | |
1172 | htab->elf.hgot->root.u.undef.abfd | |
1173 | = htab->elf.hgot->root.u.def.section->owner; | |
1174 | htab->elf.hgot->root.linker_def = 0; | |
1175 | htab->elf.hgot->ref_regular = 0; | |
1176 | htab->elf.hgot->def_regular = 0; | |
1177 | } | |
1178 | } | |
5e2ac45d L |
1179 | } |
1180 | ||
1181 | if (_bfd_elf_eh_frame_present (info)) | |
1182 | { | |
1183 | if (htab->plt_eh_frame != NULL | |
1184 | && htab->elf.splt != NULL | |
1185 | && htab->elf.splt->size != 0 | |
1186 | && !bfd_is_abs_section (htab->elf.splt->output_section)) | |
1187 | htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size; | |
1188 | ||
1189 | if (htab->plt_got_eh_frame != NULL | |
1190 | && htab->plt_got != NULL | |
1191 | && htab->plt_got->size != 0 | |
1192 | && !bfd_is_abs_section (htab->plt_got->output_section)) | |
1193 | htab->plt_got_eh_frame->size | |
1194 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1195 | ||
1196 | /* Unwind info for the second PLT and .plt.got sections are | |
1197 | identical. */ | |
1198 | if (htab->plt_second_eh_frame != NULL | |
1199 | && htab->plt_second != NULL | |
1200 | && htab->plt_second->size != 0 | |
1201 | && !bfd_is_abs_section (htab->plt_second->output_section)) | |
1202 | htab->plt_second_eh_frame->size | |
1203 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1204 | } | |
1205 | ||
1206 | /* We now have determined the sizes of the various dynamic sections. | |
1207 | Allocate memory for them. */ | |
1208 | relocs = FALSE; | |
1209 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1210 | { | |
1211 | bfd_boolean strip_section = TRUE; | |
1212 | ||
1213 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1214 | continue; | |
1215 | ||
1216 | if (s == htab->elf.splt | |
1217 | || s == htab->elf.sgot) | |
1218 | { | |
1219 | /* Strip this section if we don't need it; see the | |
1220 | comment below. */ | |
1221 | /* We'd like to strip these sections if they aren't needed, but if | |
1222 | we've exported dynamic symbols from them we must leave them. | |
1223 | It's too late to tell BFD to get rid of the symbols. */ | |
1224 | ||
1225 | if (htab->elf.hplt != NULL) | |
1226 | strip_section = FALSE; | |
1227 | } | |
1228 | else if (s == htab->elf.sgotplt | |
1229 | || s == htab->elf.iplt | |
1230 | || s == htab->elf.igotplt | |
1231 | || s == htab->plt_second | |
1232 | || s == htab->plt_got | |
1233 | || s == htab->plt_eh_frame | |
1234 | || s == htab->plt_got_eh_frame | |
1235 | || s == htab->plt_second_eh_frame | |
1236 | || s == htab->elf.sdynbss | |
1237 | || s == htab->elf.sdynrelro) | |
1238 | { | |
1239 | /* Strip these too. */ | |
1240 | } | |
1241 | else if (htab->is_reloc_section (bfd_get_section_name (dynobj, s))) | |
1242 | { | |
1243 | if (s->size != 0 | |
1244 | && s != htab->elf.srelplt | |
1245 | && s != htab->srelplt2) | |
1246 | relocs = TRUE; | |
1247 | ||
1248 | /* We use the reloc_count field as a counter if we need | |
1249 | to copy relocs into the output file. */ | |
1250 | if (s != htab->elf.srelplt) | |
1251 | s->reloc_count = 0; | |
1252 | } | |
1253 | else | |
1254 | { | |
1255 | /* It's not one of our sections, so don't allocate space. */ | |
1256 | continue; | |
1257 | } | |
1258 | ||
1259 | if (s->size == 0) | |
1260 | { | |
1261 | /* If we don't need this section, strip it from the | |
1262 | output file. This is mostly to handle .rel.bss and | |
1263 | .rel.plt. We must create both sections in | |
1264 | create_dynamic_sections, because they must be created | |
1265 | before the linker maps input sections to output | |
1266 | sections. The linker does that before | |
1267 | adjust_dynamic_symbol is called, and it is that | |
1268 | function which decides whether anything needs to go | |
1269 | into these sections. */ | |
1270 | if (strip_section) | |
1271 | s->flags |= SEC_EXCLUDE; | |
1272 | continue; | |
1273 | } | |
1274 | ||
1275 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1276 | continue; | |
1277 | ||
1278 | /* Allocate memory for the section contents. We use bfd_zalloc | |
1279 | here in case unused entries are not reclaimed before the | |
1280 | section's contents are written out. This should not happen, | |
1281 | but this way if it does, we get a R_386_NONE or R_X86_64_NONE | |
1282 | reloc instead of garbage. */ | |
1283 | s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); | |
1284 | if (s->contents == NULL) | |
1285 | return FALSE; | |
1286 | } | |
1287 | ||
1288 | if (htab->plt_eh_frame != NULL | |
1289 | && htab->plt_eh_frame->contents != NULL) | |
1290 | { | |
1291 | memcpy (htab->plt_eh_frame->contents, | |
1292 | htab->plt.eh_frame_plt, | |
1293 | htab->plt_eh_frame->size); | |
1294 | bfd_put_32 (dynobj, htab->elf.splt->size, | |
1295 | htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); | |
1296 | } | |
1297 | ||
1298 | if (htab->plt_got_eh_frame != NULL | |
1299 | && htab->plt_got_eh_frame->contents != NULL) | |
1300 | { | |
1301 | memcpy (htab->plt_got_eh_frame->contents, | |
1302 | htab->non_lazy_plt->eh_frame_plt, | |
1303 | htab->plt_got_eh_frame->size); | |
1304 | bfd_put_32 (dynobj, htab->plt_got->size, | |
1305 | (htab->plt_got_eh_frame->contents | |
1306 | + PLT_FDE_LEN_OFFSET)); | |
1307 | } | |
1308 | ||
1309 | if (htab->plt_second_eh_frame != NULL | |
1310 | && htab->plt_second_eh_frame->contents != NULL) | |
1311 | { | |
1312 | memcpy (htab->plt_second_eh_frame->contents, | |
1313 | htab->non_lazy_plt->eh_frame_plt, | |
1314 | htab->plt_second_eh_frame->size); | |
1315 | bfd_put_32 (dynobj, htab->plt_second->size, | |
1316 | (htab->plt_second_eh_frame->contents | |
1317 | + PLT_FDE_LEN_OFFSET)); | |
1318 | } | |
1319 | ||
1320 | if (htab->elf.dynamic_sections_created) | |
1321 | { | |
1322 | /* Add some entries to the .dynamic section. We fill in the | |
1323 | values later, in elf_{i386,x86_64}_finish_dynamic_sections, | |
1324 | but we must add the entries now so that we get the correct | |
1325 | size for the .dynamic section. The DT_DEBUG entry is filled | |
1326 | in by the dynamic linker and used by the debugger. */ | |
1327 | #define add_dynamic_entry(TAG, VAL) \ | |
1328 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
1329 | ||
1330 | if (bfd_link_executable (info)) | |
1331 | { | |
1332 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
1333 | return FALSE; | |
1334 | } | |
1335 | ||
1336 | if (htab->elf.splt->size != 0) | |
1337 | { | |
1338 | /* DT_PLTGOT is used by prelink even if there is no PLT | |
1339 | relocation. */ | |
1340 | if (!add_dynamic_entry (DT_PLTGOT, 0)) | |
1341 | return FALSE; | |
1342 | } | |
1343 | ||
1344 | if (htab->elf.srelplt->size != 0) | |
1345 | { | |
1346 | if (!add_dynamic_entry (DT_PLTRELSZ, 0) | |
1347 | || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc) | |
1348 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
1349 | return FALSE; | |
1350 | } | |
1351 | ||
1352 | if (htab->tlsdesc_plt | |
1353 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) | |
1354 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) | |
1355 | return FALSE; | |
1356 | ||
1357 | if (relocs) | |
1358 | { | |
1359 | if (!add_dynamic_entry (htab->dt_reloc, 0) | |
1360 | || !add_dynamic_entry (htab->dt_reloc_sz, 0) | |
1361 | || !add_dynamic_entry (htab->dt_reloc_ent, | |
1362 | htab->sizeof_reloc)) | |
1363 | return FALSE; | |
1364 | ||
1365 | /* If any dynamic relocs apply to a read-only section, | |
1366 | then we need a DT_TEXTREL entry. */ | |
1367 | if ((info->flags & DF_TEXTREL) == 0) | |
826c3f1e | 1368 | elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info); |
5e2ac45d L |
1369 | |
1370 | if ((info->flags & DF_TEXTREL) != 0) | |
1371 | { | |
1372 | if (htab->readonly_dynrelocs_against_ifunc) | |
1373 | { | |
1374 | info->callbacks->einfo | |
826c3f1e AM |
1375 | (_("%P%X: read-only segment has dynamic IFUNC relocations;" |
1376 | " recompile with -fPIC\n")); | |
5e2ac45d L |
1377 | bfd_set_error (bfd_error_bad_value); |
1378 | return FALSE; | |
1379 | } | |
1380 | ||
1381 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1382 | return FALSE; | |
1383 | } | |
1384 | } | |
851b6fa1 | 1385 | if (htab->target_os == is_vxworks |
5e2ac45d L |
1386 | && !elf_vxworks_add_dynamic_entries (output_bfd, info)) |
1387 | return FALSE; | |
1388 | } | |
1389 | #undef add_dynamic_entry | |
1390 | ||
1391 | return TRUE; | |
1392 | } | |
1393 | ||
9577f60b L |
1394 | /* Finish up the x86 dynamic sections. */ |
1395 | ||
1396 | struct elf_x86_link_hash_table * | |
1397 | _bfd_x86_elf_finish_dynamic_sections (bfd *output_bfd, | |
1398 | struct bfd_link_info *info) | |
1399 | { | |
1400 | struct elf_x86_link_hash_table *htab; | |
1401 | const struct elf_backend_data *bed; | |
1402 | bfd *dynobj; | |
1403 | asection *sdyn; | |
1404 | bfd_byte *dyncon, *dynconend; | |
1405 | bfd_size_type sizeof_dyn; | |
1406 | ||
1407 | bed = get_elf_backend_data (output_bfd); | |
1408 | htab = elf_x86_hash_table (info, bed->target_id); | |
1409 | if (htab == NULL) | |
1410 | return htab; | |
1411 | ||
1412 | dynobj = htab->elf.dynobj; | |
1413 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); | |
1414 | ||
1415 | /* GOT is always created in setup_gnu_properties. But it may not be | |
1416 | needed. .got.plt section may be needed for static IFUNC. */ | |
1417 | if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0) | |
1418 | { | |
1419 | bfd_vma dynamic_addr; | |
1420 | ||
1421 | if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) | |
1422 | { | |
1423 | _bfd_error_handler | |
871b3ab2 | 1424 | (_("discarded output section: `%pA'"), htab->elf.sgotplt); |
9577f60b L |
1425 | return NULL; |
1426 | } | |
1427 | ||
1428 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize | |
1429 | = htab->got_entry_size; | |
1430 | ||
1431 | dynamic_addr = (sdyn == NULL | |
1432 | ? (bfd_vma) 0 | |
1433 | : sdyn->output_section->vma + sdyn->output_offset); | |
1434 | ||
1435 | /* Set the first entry in the global offset table to the address | |
07d6d2b8 | 1436 | of the dynamic section. Write GOT[1] and GOT[2], needed for |
9577f60b L |
1437 | the dynamic linker. */ |
1438 | if (htab->got_entry_size == 8) | |
1439 | { | |
1440 | bfd_put_64 (output_bfd, dynamic_addr, | |
1441 | htab->elf.sgotplt->contents); | |
1442 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
1443 | htab->elf.sgotplt->contents + 8); | |
1444 | bfd_put_64 (output_bfd, (bfd_vma) 0, | |
1445 | htab->elf.sgotplt->contents + 8*2); | |
1446 | } | |
1447 | else | |
1448 | { | |
1449 | bfd_put_32 (output_bfd, dynamic_addr, | |
1450 | htab->elf.sgotplt->contents); | |
1451 | bfd_put_32 (output_bfd, 0, | |
1452 | htab->elf.sgotplt->contents + 4); | |
1453 | bfd_put_32 (output_bfd, 0, | |
1454 | htab->elf.sgotplt->contents + 4*2); | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | if (!htab->elf.dynamic_sections_created) | |
1459 | return htab; | |
1460 | ||
1461 | if (sdyn == NULL || htab->elf.sgot == NULL) | |
1462 | abort (); | |
1463 | ||
1464 | sizeof_dyn = bed->s->sizeof_dyn; | |
1465 | dyncon = sdyn->contents; | |
1466 | dynconend = sdyn->contents + sdyn->size; | |
1467 | for (; dyncon < dynconend; dyncon += sizeof_dyn) | |
1468 | { | |
1469 | Elf_Internal_Dyn dyn; | |
1470 | asection *s; | |
1471 | ||
1472 | (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn); | |
1473 | ||
1474 | switch (dyn.d_tag) | |
1475 | { | |
1476 | default: | |
851b6fa1 | 1477 | if (htab->target_os == is_vxworks |
9577f60b L |
1478 | && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) |
1479 | break; | |
1480 | continue; | |
1481 | ||
1482 | case DT_PLTGOT: | |
1483 | s = htab->elf.sgotplt; | |
1484 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; | |
1485 | break; | |
1486 | ||
1487 | case DT_JMPREL: | |
1488 | dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; | |
1489 | break; | |
1490 | ||
1491 | case DT_PLTRELSZ: | |
1492 | s = htab->elf.srelplt->output_section; | |
1493 | dyn.d_un.d_val = s->size; | |
1494 | break; | |
1495 | ||
1496 | case DT_TLSDESC_PLT: | |
1497 | s = htab->elf.splt; | |
1498 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
1499 | + htab->tlsdesc_plt; | |
1500 | break; | |
1501 | ||
1502 | case DT_TLSDESC_GOT: | |
1503 | s = htab->elf.sgot; | |
1504 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset | |
1505 | + htab->tlsdesc_got; | |
1506 | break; | |
1507 | } | |
1508 | ||
1509 | (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon); | |
1510 | } | |
1511 | ||
1512 | if (htab->plt_got != NULL && htab->plt_got->size > 0) | |
1513 | elf_section_data (htab->plt_got->output_section) | |
1514 | ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size; | |
1515 | ||
1516 | if (htab->plt_second != NULL && htab->plt_second->size > 0) | |
1517 | elf_section_data (htab->plt_second->output_section) | |
1518 | ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size; | |
1519 | ||
1520 | /* Adjust .eh_frame for .plt section. */ | |
1521 | if (htab->plt_eh_frame != NULL | |
1522 | && htab->plt_eh_frame->contents != NULL) | |
1523 | { | |
1524 | if (htab->elf.splt != NULL | |
1525 | && htab->elf.splt->size != 0 | |
1526 | && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 | |
1527 | && htab->elf.splt->output_section != NULL | |
1528 | && htab->plt_eh_frame->output_section != NULL) | |
1529 | { | |
1530 | bfd_vma plt_start = htab->elf.splt->output_section->vma; | |
1531 | bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma | |
1532 | + htab->plt_eh_frame->output_offset | |
1533 | + PLT_FDE_START_OFFSET; | |
1534 | bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, | |
1535 | htab->plt_eh_frame->contents | |
1536 | + PLT_FDE_START_OFFSET); | |
1537 | } | |
1538 | ||
1539 | if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME) | |
1540 | { | |
1541 | if (! _bfd_elf_write_section_eh_frame (output_bfd, info, | |
1542 | htab->plt_eh_frame, | |
1543 | htab->plt_eh_frame->contents)) | |
1544 | return NULL; | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | /* Adjust .eh_frame for .plt.got section. */ | |
1549 | if (htab->plt_got_eh_frame != NULL | |
1550 | && htab->plt_got_eh_frame->contents != NULL) | |
1551 | { | |
1552 | if (htab->plt_got != NULL | |
1553 | && htab->plt_got->size != 0 | |
1554 | && (htab->plt_got->flags & SEC_EXCLUDE) == 0 | |
1555 | && htab->plt_got->output_section != NULL | |
1556 | && htab->plt_got_eh_frame->output_section != NULL) | |
1557 | { | |
1558 | bfd_vma plt_start = htab->plt_got->output_section->vma; | |
1559 | bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma | |
1560 | + htab->plt_got_eh_frame->output_offset | |
1561 | + PLT_FDE_START_OFFSET; | |
1562 | bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, | |
1563 | htab->plt_got_eh_frame->contents | |
1564 | + PLT_FDE_START_OFFSET); | |
1565 | } | |
1566 | if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME) | |
1567 | { | |
1568 | if (! _bfd_elf_write_section_eh_frame (output_bfd, info, | |
1569 | htab->plt_got_eh_frame, | |
1570 | htab->plt_got_eh_frame->contents)) | |
1571 | return NULL; | |
1572 | } | |
1573 | } | |
1574 | ||
1575 | /* Adjust .eh_frame for the second PLT section. */ | |
1576 | if (htab->plt_second_eh_frame != NULL | |
1577 | && htab->plt_second_eh_frame->contents != NULL) | |
1578 | { | |
1579 | if (htab->plt_second != NULL | |
1580 | && htab->plt_second->size != 0 | |
1581 | && (htab->plt_second->flags & SEC_EXCLUDE) == 0 | |
1582 | && htab->plt_second->output_section != NULL | |
1583 | && htab->plt_second_eh_frame->output_section != NULL) | |
1584 | { | |
1585 | bfd_vma plt_start = htab->plt_second->output_section->vma; | |
1586 | bfd_vma eh_frame_start | |
1587 | = (htab->plt_second_eh_frame->output_section->vma | |
1588 | + htab->plt_second_eh_frame->output_offset | |
1589 | + PLT_FDE_START_OFFSET); | |
1590 | bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, | |
1591 | htab->plt_second_eh_frame->contents | |
1592 | + PLT_FDE_START_OFFSET); | |
1593 | } | |
1594 | if (htab->plt_second_eh_frame->sec_info_type | |
1595 | == SEC_INFO_TYPE_EH_FRAME) | |
1596 | { | |
1597 | if (! _bfd_elf_write_section_eh_frame (output_bfd, info, | |
1598 | htab->plt_second_eh_frame, | |
1599 | htab->plt_second_eh_frame->contents)) | |
1600 | return NULL; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | if (htab->elf.sgot && htab->elf.sgot->size > 0) | |
1605 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize | |
1606 | = htab->got_entry_size; | |
1607 | ||
1608 | return htab; | |
1609 | } | |
1610 | ||
1611 | ||
0afcef53 L |
1612 | bfd_boolean |
1613 | _bfd_x86_elf_always_size_sections (bfd *output_bfd, | |
1614 | struct bfd_link_info *info) | |
1615 | { | |
1616 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
1617 | ||
1618 | if (tls_sec) | |
1619 | { | |
1620 | struct elf_link_hash_entry *tlsbase; | |
1621 | ||
1622 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
1623 | "_TLS_MODULE_BASE_", | |
1624 | FALSE, FALSE, FALSE); | |
1625 | ||
1626 | if (tlsbase && tlsbase->type == STT_TLS) | |
1627 | { | |
1628 | struct elf_x86_link_hash_table *htab; | |
1629 | struct bfd_link_hash_entry *bh = NULL; | |
1630 | const struct elf_backend_data *bed | |
1631 | = get_elf_backend_data (output_bfd); | |
1632 | ||
1633 | htab = elf_x86_hash_table (info, bed->target_id); | |
1634 | if (htab == NULL) | |
1635 | return FALSE; | |
1636 | ||
1637 | if (!(_bfd_generic_link_add_one_symbol | |
1638 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
1639 | tls_sec, 0, NULL, FALSE, | |
1640 | bed->collect, &bh))) | |
1641 | return FALSE; | |
1642 | ||
1643 | htab->tls_module_base = bh; | |
1644 | ||
1645 | tlsbase = (struct elf_link_hash_entry *)bh; | |
1646 | tlsbase->def_regular = 1; | |
1647 | tlsbase->other = STV_HIDDEN; | |
1648 | tlsbase->root.linker_def = 1; | |
1649 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | return TRUE; | |
1654 | } | |
1655 | ||
1656 | void | |
1657 | _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h, | |
1658 | const Elf_Internal_Sym *isym, | |
1659 | bfd_boolean definition, | |
1660 | bfd_boolean dynamic ATTRIBUTE_UNUSED) | |
1661 | { | |
1662 | if (definition) | |
1663 | { | |
1664 | struct elf_x86_link_hash_entry *eh | |
1665 | = (struct elf_x86_link_hash_entry *) h; | |
1666 | eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other) | |
1667 | == STV_PROTECTED); | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
1672 | ||
1673 | void | |
1674 | _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
1675 | struct elf_link_hash_entry *dir, | |
1676 | struct elf_link_hash_entry *ind) | |
1677 | { | |
1678 | struct elf_x86_link_hash_entry *edir, *eind; | |
1679 | ||
1680 | edir = (struct elf_x86_link_hash_entry *) dir; | |
1681 | eind = (struct elf_x86_link_hash_entry *) ind; | |
1682 | ||
1683 | if (eind->dyn_relocs != NULL) | |
1684 | { | |
1685 | if (edir->dyn_relocs != NULL) | |
1686 | { | |
1687 | struct elf_dyn_relocs **pp; | |
1688 | struct elf_dyn_relocs *p; | |
1689 | ||
1690 | /* Add reloc counts against the indirect sym to the direct sym | |
1691 | list. Merge any entries against the same section. */ | |
1692 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
1693 | { | |
1694 | struct elf_dyn_relocs *q; | |
1695 | ||
1696 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
1697 | if (q->sec == p->sec) | |
1698 | { | |
1699 | q->pc_count += p->pc_count; | |
1700 | q->count += p->count; | |
1701 | *pp = p->next; | |
1702 | break; | |
1703 | } | |
1704 | if (q == NULL) | |
1705 | pp = &p->next; | |
1706 | } | |
1707 | *pp = edir->dyn_relocs; | |
1708 | } | |
1709 | ||
1710 | edir->dyn_relocs = eind->dyn_relocs; | |
1711 | eind->dyn_relocs = NULL; | |
1712 | } | |
1713 | ||
1714 | if (ind->root.type == bfd_link_hash_indirect | |
1715 | && dir->got.refcount <= 0) | |
1716 | { | |
1717 | edir->tls_type = eind->tls_type; | |
1718 | eind->tls_type = GOT_UNKNOWN; | |
1719 | } | |
1720 | ||
1721 | /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will | |
1722 | generate a R_386_COPY reloc. */ | |
1723 | edir->gotoff_ref |= eind->gotoff_ref; | |
1724 | ||
98b273dc | 1725 | edir->zero_undefweak |= eind->zero_undefweak; |
0afcef53 L |
1726 | |
1727 | if (ELIMINATE_COPY_RELOCS | |
1728 | && ind->root.type != bfd_link_hash_indirect | |
1729 | && dir->dynamic_adjusted) | |
1730 | { | |
1731 | /* If called to transfer flags for a weakdef during processing | |
1732 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
1733 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
1734 | if (dir->versioned != versioned_hidden) | |
1735 | dir->ref_dynamic |= ind->ref_dynamic; | |
1736 | dir->ref_regular |= ind->ref_regular; | |
1737 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
1738 | dir->needs_plt |= ind->needs_plt; | |
1739 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
1740 | } | |
1741 | else | |
79b0c981 | 1742 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
0afcef53 L |
1743 | } |
1744 | ||
1745 | /* Remove undefined weak symbol from the dynamic symbol table if it | |
1746 | is resolved to 0. */ | |
1747 | ||
1748 | bfd_boolean | |
1749 | _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info, | |
1750 | struct elf_link_hash_entry *h) | |
1751 | { | |
c5bce5c6 L |
1752 | if (h->dynindx != -1 |
1753 | && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, elf_x86_hash_entry (h))) | |
0afcef53 | 1754 | { |
c5bce5c6 L |
1755 | h->dynindx = -1; |
1756 | _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, | |
1757 | h->dynstr_index); | |
0afcef53 L |
1758 | } |
1759 | return TRUE; | |
1760 | } | |
1761 | ||
4ec09950 L |
1762 | /* Change the STT_GNU_IFUNC symbol defined in position-dependent |
1763 | executable into the normal function symbol and set its address | |
1764 | to its PLT entry, which should be resolved by R_*_IRELATIVE at | |
1765 | run-time. */ | |
1766 | ||
1767 | void | |
1768 | _bfd_x86_elf_link_fixup_ifunc_symbol (struct bfd_link_info *info, | |
1769 | struct elf_x86_link_hash_table *htab, | |
1770 | struct elf_link_hash_entry *h, | |
1771 | Elf_Internal_Sym *sym) | |
1772 | { | |
1773 | if (bfd_link_pde (info) | |
1774 | && h->def_regular | |
1775 | && h->dynindx != -1 | |
1776 | && h->plt.offset != (bfd_vma) -1 | |
1777 | && h->type == STT_GNU_IFUNC | |
1778 | && h->pointer_equality_needed) | |
1779 | { | |
1780 | asection *plt_s; | |
1781 | bfd_vma plt_offset; | |
1782 | bfd *output_bfd = info->output_bfd; | |
1783 | ||
1784 | if (htab->plt_second) | |
1785 | { | |
1786 | struct elf_x86_link_hash_entry *eh | |
1787 | = (struct elf_x86_link_hash_entry *) h; | |
1788 | ||
1789 | plt_s = htab->plt_second; | |
1790 | plt_offset = eh->plt_second.offset; | |
1791 | } | |
1792 | else | |
1793 | { | |
1794 | plt_s = htab->elf.splt; | |
1795 | plt_offset = h->plt.offset; | |
1796 | } | |
1797 | ||
1798 | sym->st_size = 0; | |
1799 | sym->st_info = ELF_ST_INFO (ELF_ST_BIND (sym->st_info), STT_FUNC); | |
1800 | sym->st_shndx | |
1801 | = _bfd_elf_section_from_bfd_section (output_bfd, | |
1802 | plt_s->output_section); | |
1803 | sym->st_value = (plt_s->output_section->vma | |
1804 | + plt_s->output_offset + plt_offset); | |
1805 | } | |
1806 | } | |
1807 | ||
0afcef53 L |
1808 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
1809 | ||
1810 | bfd_boolean | |
1811 | _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h) | |
1812 | { | |
1813 | if (h->plt.offset != (bfd_vma) -1 | |
1814 | && !h->def_regular | |
1815 | && !h->pointer_equality_needed) | |
1816 | return FALSE; | |
1817 | ||
1818 | return _bfd_elf_hash_symbol (h); | |
1819 | } | |
1820 | ||
eeb2f20a L |
1821 | /* Adjust a symbol defined by a dynamic object and referenced by a |
1822 | regular object. The current definition is in some section of the | |
1823 | dynamic object, but we're not including those sections. We have to | |
1824 | change the definition to something the rest of the link can | |
1825 | understand. */ | |
1826 | ||
1827 | bfd_boolean | |
1828 | _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info, | |
1829 | struct elf_link_hash_entry *h) | |
1830 | { | |
1831 | struct elf_x86_link_hash_table *htab; | |
1832 | asection *s, *srel; | |
1833 | struct elf_x86_link_hash_entry *eh; | |
1834 | struct elf_dyn_relocs *p; | |
1835 | const struct elf_backend_data *bed | |
1836 | = get_elf_backend_data (info->output_bfd); | |
1837 | ||
1838 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
1839 | if (h->type == STT_GNU_IFUNC) | |
1840 | { | |
1841 | /* All local STT_GNU_IFUNC references must be treate as local | |
1842 | calls via local PLT. */ | |
1843 | if (h->ref_regular | |
1844 | && SYMBOL_CALLS_LOCAL (info, h)) | |
1845 | { | |
1846 | bfd_size_type pc_count = 0, count = 0; | |
1847 | struct elf_dyn_relocs **pp; | |
1848 | ||
1849 | eh = (struct elf_x86_link_hash_entry *) h; | |
1850 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1851 | { | |
1852 | pc_count += p->pc_count; | |
1853 | p->count -= p->pc_count; | |
1854 | p->pc_count = 0; | |
1855 | count += p->count; | |
1856 | if (p->count == 0) | |
1857 | *pp = p->next; | |
1858 | else | |
1859 | pp = &p->next; | |
1860 | } | |
1861 | ||
1862 | if (pc_count || count) | |
1863 | { | |
1864 | h->non_got_ref = 1; | |
1865 | if (pc_count) | |
1866 | { | |
1867 | /* Increment PLT reference count only for PC-relative | |
1868 | references. */ | |
1869 | h->needs_plt = 1; | |
1870 | if (h->plt.refcount <= 0) | |
1871 | h->plt.refcount = 1; | |
1872 | else | |
1873 | h->plt.refcount += 1; | |
1874 | } | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if (h->plt.refcount <= 0) | |
1879 | { | |
1880 | h->plt.offset = (bfd_vma) -1; | |
1881 | h->needs_plt = 0; | |
1882 | } | |
1883 | return TRUE; | |
1884 | } | |
1885 | ||
1886 | /* If this is a function, put it in the procedure linkage table. We | |
1887 | will fill in the contents of the procedure linkage table later, | |
1888 | when we know the address of the .got section. */ | |
1889 | if (h->type == STT_FUNC | |
1890 | || h->needs_plt) | |
1891 | { | |
1892 | if (h->plt.refcount <= 0 | |
1893 | || SYMBOL_CALLS_LOCAL (info, h) | |
1894 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1895 | && h->root.type == bfd_link_hash_undefweak)) | |
1896 | { | |
1897 | /* This case can occur if we saw a PLT32 reloc in an input | |
1898 | file, but the symbol was never referred to by a dynamic | |
1899 | object, or if all references were garbage collected. In | |
1900 | such a case, we don't actually need to build a procedure | |
1901 | linkage table, and we can just do a PC32 reloc instead. */ | |
1902 | h->plt.offset = (bfd_vma) -1; | |
1903 | h->needs_plt = 0; | |
1904 | } | |
1905 | ||
1906 | return TRUE; | |
1907 | } | |
1908 | else | |
1909 | /* It's possible that we incorrectly decided a .plt reloc was needed | |
1910 | * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in | |
1911 | check_relocs. We can't decide accurately between function and | |
1912 | non-function syms in check-relocs; Objects loaded later in | |
1913 | the link may change h->type. So fix it now. */ | |
1914 | h->plt.offset = (bfd_vma) -1; | |
1915 | ||
1916 | eh = (struct elf_x86_link_hash_entry *) h; | |
1917 | ||
1918 | /* If this is a weak symbol, and there is a real definition, the | |
1919 | processor independent code will have arranged for us to see the | |
1920 | real definition first, and we can just use the same value. */ | |
60d67dc8 | 1921 | if (h->is_weakalias) |
eeb2f20a | 1922 | { |
60d67dc8 AM |
1923 | struct elf_link_hash_entry *def = weakdef (h); |
1924 | BFD_ASSERT (def->root.type == bfd_link_hash_defined); | |
1925 | h->root.u.def.section = def->root.u.def.section; | |
1926 | h->root.u.def.value = def->root.u.def.value; | |
eeb2f20a L |
1927 | if (ELIMINATE_COPY_RELOCS |
1928 | || info->nocopyreloc | |
1929 | || SYMBOL_NO_COPYRELOC (info, eh)) | |
1930 | { | |
1931 | /* NB: needs_copy is always 0 for i386. */ | |
60d67dc8 AM |
1932 | h->non_got_ref = def->non_got_ref; |
1933 | eh->needs_copy = def->needs_copy; | |
eeb2f20a L |
1934 | } |
1935 | return TRUE; | |
1936 | } | |
1937 | ||
1938 | /* This is a reference to a symbol defined by a dynamic object which | |
1939 | is not a function. */ | |
1940 | ||
1941 | /* If we are creating a shared library, we must presume that the | |
1942 | only references to the symbol are via the global offset table. | |
1943 | For such cases we need not do anything here; the relocations will | |
1944 | be handled correctly by relocate_section. */ | |
1945 | if (!bfd_link_executable (info)) | |
1946 | return TRUE; | |
1947 | ||
1948 | /* If there are no references to this symbol that do not use the | |
1949 | GOT nor R_386_GOTOFF relocation, we don't need to generate a copy | |
1950 | reloc. NB: gotoff_ref is always 0 for x86-64. */ | |
1951 | if (!h->non_got_ref && !eh->gotoff_ref) | |
1952 | return TRUE; | |
1953 | ||
1954 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1955 | if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh)) | |
1956 | { | |
1957 | h->non_got_ref = 0; | |
1958 | return TRUE; | |
1959 | } | |
1960 | ||
1961 | htab = elf_x86_hash_table (info, bed->target_id); | |
1962 | if (htab == NULL) | |
1963 | return FALSE; | |
1964 | ||
1965 | /* If there aren't any dynamic relocs in read-only sections nor | |
1966 | R_386_GOTOFF relocation, then we can keep the dynamic relocs and | |
1967 | avoid the copy reloc. This doesn't work on VxWorks, where we can | |
1968 | not have dynamic relocations (other than copy and jump slot | |
1969 | relocations) in an executable. */ | |
1970 | if (ELIMINATE_COPY_RELOCS | |
1971 | && (bed->target_id == X86_64_ELF_DATA | |
1972 | || (!eh->gotoff_ref | |
851b6fa1 | 1973 | && htab->target_os != is_vxworks))) |
eeb2f20a | 1974 | { |
826c3f1e | 1975 | /* If we don't find any dynamic relocs in read-only sections, |
eeb2f20a L |
1976 | then we'll be keeping the dynamic relocs and avoiding the copy |
1977 | reloc. */ | |
826c3f1e | 1978 | if (!readonly_dynrelocs (h)) |
eeb2f20a L |
1979 | { |
1980 | h->non_got_ref = 0; | |
1981 | return TRUE; | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | /* We must allocate the symbol in our .dynbss section, which will | |
1986 | become part of the .bss section of the executable. There will be | |
1987 | an entry for this symbol in the .dynsym section. The dynamic | |
1988 | object will contain position independent code, so all references | |
1989 | from the dynamic object to this symbol will go through the global | |
1990 | offset table. The dynamic linker will use the .dynsym entry to | |
1991 | determine the address it must put in the global offset table, so | |
1992 | both the dynamic object and the regular object will refer to the | |
1993 | same memory location for the variable. */ | |
1994 | ||
1995 | /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the | |
1996 | dynamic linker to copy the initial value out of the dynamic object | |
1997 | and into the runtime process image. */ | |
1998 | if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
1999 | { | |
2000 | s = htab->elf.sdynrelro; | |
2001 | srel = htab->elf.sreldynrelro; | |
2002 | } | |
2003 | else | |
2004 | { | |
2005 | s = htab->elf.sdynbss; | |
2006 | srel = htab->elf.srelbss; | |
2007 | } | |
2008 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) | |
2009 | { | |
503294e7 | 2010 | srel->size += htab->sizeof_reloc; |
eeb2f20a L |
2011 | h->needs_copy = 1; |
2012 | } | |
2013 | ||
2014 | return _bfd_elf_adjust_dynamic_copy (info, h, s); | |
2015 | } | |
2016 | ||
9f857535 L |
2017 | void |
2018 | _bfd_x86_elf_hide_symbol (struct bfd_link_info *info, | |
2019 | struct elf_link_hash_entry *h, | |
2020 | bfd_boolean force_local) | |
2021 | { | |
2022 | if (h->root.type == bfd_link_hash_undefweak | |
2023 | && info->nointerp | |
2024 | && bfd_link_pie (info)) | |
2025 | { | |
2026 | /* When there is no dynamic interpreter in PIE, make the undefined | |
2027 | weak symbol dynamic so that PC relative branch to the undefined | |
2028 | weak symbol will land to address 0. */ | |
2029 | struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); | |
79b0c981 | 2030 | if (h->plt.refcount > 0 |
9f857535 L |
2031 | || eh->plt_got.refcount > 0) |
2032 | return; | |
2033 | } | |
2034 | ||
2035 | _bfd_elf_link_hash_hide_symbol (info, h, force_local); | |
2036 | } | |
2037 | ||
6999821f L |
2038 | /* Return TRUE if a symbol is referenced locally. It is similar to |
2039 | SYMBOL_REFERENCES_LOCAL, but it also checks version script. It | |
2040 | works in check_relocs. */ | |
2041 | ||
2042 | bfd_boolean | |
2043 | _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info, | |
2044 | struct elf_link_hash_entry *h) | |
2045 | { | |
0a27fed7 L |
2046 | struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); |
2047 | struct elf_x86_link_hash_table *htab | |
2048 | = (struct elf_x86_link_hash_table *) info->hash; | |
6999821f L |
2049 | |
2050 | if (eh->local_ref > 1) | |
2051 | return TRUE; | |
2052 | ||
2053 | if (eh->local_ref == 1) | |
2054 | return FALSE; | |
2055 | ||
2056 | /* Unversioned symbols defined in regular objects can be forced local | |
0a27fed7 L |
2057 | by linker version script. A weak undefined symbol is forced local |
2058 | if | |
2059 | 1. It has non-default visibility. Or | |
8fbf0ba1 | 2060 | 2. When building executable, there is no dynamic linker. Or |
0a27fed7 L |
2061 | 3. or "-z nodynamic-undefined-weak" is used. |
2062 | */ | |
6999821f | 2063 | if (SYMBOL_REFERENCES_LOCAL (info, h) |
0a27fed7 L |
2064 | || (h->root.type == bfd_link_hash_undefweak |
2065 | && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
2066 | || (bfd_link_executable (info) | |
8fbf0ba1 | 2067 | && htab->interp == NULL) |
0a27fed7 | 2068 | || info->dynamic_undefined_weak == 0)) |
6999821f | 2069 | || ((h->def_regular || ELF_COMMON_DEF_P (h)) |
6999821f | 2070 | && info->version_info != NULL |
099bb8fb | 2071 | && _bfd_elf_link_hide_sym_by_version (info, h))) |
6999821f L |
2072 | { |
2073 | eh->local_ref = 2; | |
2074 | return TRUE; | |
2075 | } | |
2076 | ||
099bb8fb | 2077 | eh->local_ref = 1; |
6999821f L |
2078 | return FALSE; |
2079 | } | |
2080 | ||
4f501a24 L |
2081 | /* Return the section that should be marked against GC for a given |
2082 | relocation. */ | |
2083 | ||
2084 | asection * | |
2085 | _bfd_x86_elf_gc_mark_hook (asection *sec, | |
2086 | struct bfd_link_info *info, | |
2087 | Elf_Internal_Rela *rel, | |
2088 | struct elf_link_hash_entry *h, | |
2089 | Elf_Internal_Sym *sym) | |
2090 | { | |
2091 | /* Compiler should optimize this out. */ | |
2092 | if (((unsigned int) R_X86_64_GNU_VTINHERIT | |
2093 | != (unsigned int) R_386_GNU_VTINHERIT) | |
2094 | || ((unsigned int) R_X86_64_GNU_VTENTRY | |
2095 | != (unsigned int) R_386_GNU_VTENTRY)) | |
2096 | abort (); | |
2097 | ||
2098 | if (h != NULL) | |
2099 | switch (ELF32_R_TYPE (rel->r_info)) | |
2100 | { | |
2101 | case R_X86_64_GNU_VTINHERIT: | |
2102 | case R_X86_64_GNU_VTENTRY: | |
2103 | return NULL; | |
2104 | } | |
2105 | ||
2106 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
2107 | } | |
2108 | ||
f493882d L |
2109 | static bfd_vma |
2110 | elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED, | |
2111 | bfd_vma off, | |
2112 | bfd_vma offset ATTRIBUTE_UNUSED, | |
2113 | bfd_vma got_addr) | |
2114 | { | |
2115 | return got_addr + off; | |
2116 | } | |
2117 | ||
2118 | static bfd_vma | |
2119 | elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p, | |
2120 | bfd_vma off, | |
2121 | bfd_vma offset, | |
2122 | bfd_vma got_addr ATTRIBUTE_UNUSED) | |
2123 | { | |
2124 | return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size; | |
2125 | } | |
2126 | ||
2127 | static bfd_boolean | |
2128 | elf_i386_valid_plt_reloc_p (unsigned int type) | |
2129 | { | |
2130 | return (type == R_386_JUMP_SLOT | |
2131 | || type == R_386_GLOB_DAT | |
2132 | || type == R_386_IRELATIVE); | |
2133 | } | |
2134 | ||
2135 | static bfd_boolean | |
2136 | elf_x86_64_valid_plt_reloc_p (unsigned int type) | |
2137 | { | |
2138 | return (type == R_X86_64_JUMP_SLOT | |
2139 | || type == R_X86_64_GLOB_DAT | |
2140 | || type == R_X86_64_IRELATIVE); | |
2141 | } | |
2142 | ||
2143 | long | |
2144 | _bfd_x86_elf_get_synthetic_symtab (bfd *abfd, | |
2145 | long count, | |
2146 | long relsize, | |
2147 | bfd_vma got_addr, | |
2148 | struct elf_x86_plt plts[], | |
2149 | asymbol **dynsyms, | |
2150 | asymbol **ret) | |
2151 | { | |
2152 | long size, i, n, len; | |
2153 | int j; | |
2154 | unsigned int plt_got_offset, plt_entry_size; | |
2155 | asymbol *s; | |
2156 | bfd_byte *plt_contents; | |
2157 | long dynrelcount; | |
2158 | arelent **dynrelbuf, *p; | |
2159 | char *names; | |
2160 | const struct elf_backend_data *bed; | |
2161 | bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma, | |
2162 | bfd_vma); | |
2163 | bfd_boolean (*valid_plt_reloc_p) (unsigned int); | |
2164 | ||
2165 | if (count == 0) | |
2166 | return -1; | |
2167 | ||
2168 | dynrelbuf = (arelent **) bfd_malloc (relsize); | |
2169 | if (dynrelbuf == NULL) | |
2170 | return -1; | |
2171 | ||
2172 | dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf, | |
2173 | dynsyms); | |
b69e9267 | 2174 | if (dynrelcount <= 0) |
94670f6c | 2175 | return -1; |
f493882d L |
2176 | |
2177 | /* Sort the relocs by address. */ | |
2178 | qsort (dynrelbuf, dynrelcount, sizeof (arelent *), | |
2179 | _bfd_x86_elf_compare_relocs); | |
2180 | ||
2181 | size = count * sizeof (asymbol); | |
2182 | ||
2183 | /* Allocate space for @plt suffixes. */ | |
2184 | n = 0; | |
2185 | for (i = 0; i < dynrelcount; i++) | |
2186 | { | |
2187 | p = dynrelbuf[i]; | |
2188 | size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); | |
2189 | if (p->addend != 0) | |
2190 | size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd); | |
2191 | } | |
2192 | ||
2193 | s = *ret = (asymbol *) bfd_zmalloc (size); | |
2194 | if (s == NULL) | |
2195 | goto bad_return; | |
2196 | ||
2197 | bed = get_elf_backend_data (abfd); | |
2198 | ||
2199 | if (bed->target_id == X86_64_ELF_DATA) | |
2200 | { | |
2201 | get_plt_got_vma = elf_x86_64_get_plt_got_vma; | |
2202 | valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p; | |
2203 | } | |
2204 | else | |
2205 | { | |
2206 | get_plt_got_vma = elf_i386_get_plt_got_vma; | |
2207 | valid_plt_reloc_p = elf_i386_valid_plt_reloc_p; | |
2208 | if (got_addr) | |
2209 | { | |
2210 | /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_ | |
2211 | address. */ | |
2212 | asection *sec = bfd_get_section_by_name (abfd, ".got.plt"); | |
2213 | if (sec != NULL) | |
2214 | got_addr = sec->vma; | |
2215 | else | |
2216 | { | |
2217 | sec = bfd_get_section_by_name (abfd, ".got"); | |
2218 | if (sec != NULL) | |
2219 | got_addr = sec->vma; | |
2220 | } | |
2221 | ||
2222 | if (got_addr == (bfd_vma) -1) | |
2223 | goto bad_return; | |
2224 | } | |
2225 | } | |
2226 | ||
2227 | /* Check for each PLT section. */ | |
2228 | names = (char *) (s + count); | |
2229 | size = 0; | |
2230 | n = 0; | |
2231 | for (j = 0; plts[j].name != NULL; j++) | |
2232 | if ((plt_contents = plts[j].contents) != NULL) | |
2233 | { | |
2234 | long k; | |
2235 | bfd_vma offset; | |
2236 | asection *plt; | |
2237 | struct elf_x86_plt *plt_p = &plts[j]; | |
2238 | ||
2239 | plt_got_offset = plt_p->plt_got_offset; | |
2240 | plt_entry_size = plt_p->plt_entry_size; | |
2241 | ||
2242 | plt = plt_p->sec; | |
2243 | ||
2244 | if ((plt_p->type & plt_lazy)) | |
2245 | { | |
2246 | /* Skip PLT0 in lazy PLT. */ | |
2247 | k = 1; | |
2248 | offset = plt_entry_size; | |
2249 | } | |
2250 | else | |
2251 | { | |
2252 | k = 0; | |
2253 | offset = 0; | |
2254 | } | |
2255 | ||
2256 | /* Check each PLT entry against dynamic relocations. */ | |
2257 | for (; k < plt_p->count; k++) | |
2258 | { | |
2259 | int off; | |
2260 | bfd_vma got_vma; | |
2261 | long min, max, mid; | |
2262 | ||
2263 | /* Get the GOT offset for i386 or the PC-relative offset | |
2264 | for x86-64, a signed 32-bit integer. */ | |
2265 | off = H_GET_32 (abfd, (plt_contents + offset | |
2266 | + plt_got_offset)); | |
2267 | got_vma = get_plt_got_vma (plt_p, off, offset, got_addr); | |
2268 | ||
2269 | /* Binary search. */ | |
2270 | p = dynrelbuf[0]; | |
2271 | min = 0; | |
2272 | max = dynrelcount; | |
2273 | while ((min + 1) < max) | |
2274 | { | |
2275 | arelent *r; | |
2276 | ||
2277 | mid = (min + max) / 2; | |
2278 | r = dynrelbuf[mid]; | |
2279 | if (got_vma > r->address) | |
2280 | min = mid; | |
2281 | else if (got_vma < r->address) | |
2282 | max = mid; | |
2283 | else | |
2284 | { | |
2285 | p = r; | |
2286 | break; | |
2287 | } | |
2288 | } | |
2289 | ||
2290 | /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */ | |
2291 | if (got_vma == p->address | |
2292 | && p->howto != NULL | |
2293 | && valid_plt_reloc_p (p->howto->type)) | |
2294 | { | |
2295 | *s = **p->sym_ptr_ptr; | |
2296 | /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL | |
2297 | set. Since we are defining a symbol, ensure one | |
2298 | of them is set. */ | |
2299 | if ((s->flags & BSF_LOCAL) == 0) | |
2300 | s->flags |= BSF_GLOBAL; | |
2301 | s->flags |= BSF_SYNTHETIC; | |
2302 | /* This is no longer a section symbol. */ | |
2303 | s->flags &= ~BSF_SECTION_SYM; | |
2304 | s->section = plt; | |
2305 | s->the_bfd = plt->owner; | |
2306 | s->value = offset; | |
2307 | s->udata.p = NULL; | |
2308 | s->name = names; | |
2309 | len = strlen ((*p->sym_ptr_ptr)->name); | |
2310 | memcpy (names, (*p->sym_ptr_ptr)->name, len); | |
2311 | names += len; | |
2312 | if (p->addend != 0) | |
2313 | { | |
2314 | char buf[30], *a; | |
2315 | ||
2316 | memcpy (names, "+0x", sizeof ("+0x") - 1); | |
2317 | names += sizeof ("+0x") - 1; | |
2318 | bfd_sprintf_vma (abfd, buf, p->addend); | |
2319 | for (a = buf; *a == '0'; ++a) | |
2320 | ; | |
2321 | size = strlen (a); | |
2322 | memcpy (names, a, size); | |
2323 | names += size; | |
2324 | } | |
2325 | memcpy (names, "@plt", sizeof ("@plt")); | |
2326 | names += sizeof ("@plt"); | |
2327 | n++; | |
2328 | s++; | |
61e3bf5f L |
2329 | /* There should be only one entry in PLT for a given |
2330 | symbol. Set howto to NULL after processing a PLT | |
2331 | entry to guard against corrupted PLT. */ | |
2332 | p->howto = NULL; | |
f493882d L |
2333 | } |
2334 | offset += plt_entry_size; | |
2335 | } | |
2336 | } | |
2337 | ||
2338 | /* PLT entries with R_386_TLS_DESC relocations are skipped. */ | |
2339 | if (n == 0) | |
2340 | { | |
2341 | bad_return: | |
2342 | count = -1; | |
2343 | } | |
2344 | else | |
2345 | count = n; | |
2346 | ||
2347 | for (j = 0; plts[j].name != NULL; j++) | |
2348 | if (plts[j].contents != NULL) | |
2349 | free (plts[j].contents); | |
2350 | ||
2351 | free (dynrelbuf); | |
2352 | ||
2353 | return count; | |
2354 | } | |
2355 | ||
0afcef53 L |
2356 | /* Parse x86 GNU properties. */ |
2357 | ||
2358 | enum elf_property_kind | |
2359 | _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type, | |
2360 | bfd_byte *ptr, unsigned int datasz) | |
2361 | { | |
2362 | elf_property *prop; | |
2363 | ||
a9eafb08 L |
2364 | if (type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED |
2365 | || type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED | |
2366 | || (type >= GNU_PROPERTY_X86_UINT32_AND_LO | |
2367 | && type <= GNU_PROPERTY_X86_UINT32_AND_HI) | |
2368 | || (type >= GNU_PROPERTY_X86_UINT32_OR_LO | |
2369 | && type <= GNU_PROPERTY_X86_UINT32_OR_HI) | |
2370 | || (type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO | |
2371 | && type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI)) | |
0afcef53 | 2372 | { |
0afcef53 L |
2373 | if (datasz != 4) |
2374 | { | |
2375 | _bfd_error_handler | |
a9eafb08 L |
2376 | (_("error: %pB: <corrupt x86 property (0x%x) size: 0x%x>"), |
2377 | abfd, type, datasz); | |
0afcef53 L |
2378 | return property_corrupt; |
2379 | } | |
2380 | prop = _bfd_elf_get_property (abfd, type, datasz); | |
90c745dc | 2381 | prop->u.number |= bfd_h_get_32 (abfd, ptr); |
0afcef53 | 2382 | prop->pr_kind = property_number; |
a9eafb08 | 2383 | return property_number; |
0afcef53 L |
2384 | } |
2385 | ||
a9eafb08 | 2386 | return property_ignored; |
0afcef53 L |
2387 | } |
2388 | ||
2389 | /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL, | |
2390 | return TRUE if APROP is updated. Otherwise, return TRUE if BPROP | |
2391 | should be merged with ABFD. */ | |
2392 | ||
2393 | bfd_boolean | |
2394 | _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info, | |
2395 | bfd *abfd ATTRIBUTE_UNUSED, | |
2396 | elf_property *aprop, | |
2397 | elf_property *bprop) | |
2398 | { | |
2399 | unsigned int number, features; | |
2400 | bfd_boolean updated = FALSE; | |
2401 | unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type; | |
2402 | ||
a9eafb08 L |
2403 | if (pr_type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED |
2404 | || (pr_type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO | |
2405 | && pr_type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI)) | |
0afcef53 | 2406 | { |
f7309df2 L |
2407 | if (aprop == NULL || bprop == NULL) |
2408 | { | |
2409 | /* Only one of APROP and BPROP can be NULL. */ | |
2410 | if (aprop != NULL) | |
2411 | { | |
2412 | /* Remove this property since the other input file doesn't | |
2413 | have it. */ | |
2414 | aprop->pr_kind = property_remove; | |
2415 | updated = TRUE; | |
2416 | } | |
a9eafb08 | 2417 | return updated; |
f7309df2 L |
2418 | } |
2419 | goto or_property; | |
a9eafb08 L |
2420 | } |
2421 | else if (pr_type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED | |
2422 | || (pr_type >= GNU_PROPERTY_X86_UINT32_OR_LO | |
2423 | && pr_type <= GNU_PROPERTY_X86_UINT32_OR_HI)) | |
2424 | { | |
0afcef53 L |
2425 | if (aprop != NULL && bprop != NULL) |
2426 | { | |
f7309df2 | 2427 | or_property: |
0afcef53 L |
2428 | number = aprop->u.number; |
2429 | aprop->u.number = number | bprop->u.number; | |
f7309df2 | 2430 | /* Remove the property if all bits are empty. */ |
56ad703d L |
2431 | if (aprop->u.number == 0) |
2432 | { | |
2433 | aprop->pr_kind = property_remove; | |
2434 | updated = TRUE; | |
2435 | } | |
2436 | else | |
2437 | updated = number != (unsigned int) aprop->u.number; | |
0afcef53 L |
2438 | } |
2439 | else | |
2440 | { | |
56ad703d L |
2441 | /* Only one of APROP and BPROP can be NULL. */ |
2442 | if (aprop != NULL) | |
2443 | { | |
2444 | if (aprop->u.number == 0) | |
2445 | { | |
f7309df2 | 2446 | /* Remove APROP if all bits are empty. */ |
56ad703d L |
2447 | aprop->pr_kind = property_remove; |
2448 | updated = TRUE; | |
2449 | } | |
2450 | } | |
2451 | else | |
2452 | { | |
f7309df2 | 2453 | /* Return TRUE if APROP is NULL and all bits of BPROP |
56ad703d L |
2454 | aren't empty to indicate that BPROP should be added |
2455 | to ABFD. */ | |
2456 | updated = bprop->u.number != 0; | |
2457 | } | |
0afcef53 | 2458 | } |
a9eafb08 L |
2459 | return updated; |
2460 | } | |
2461 | else if (pr_type >= GNU_PROPERTY_X86_UINT32_AND_LO | |
2462 | && pr_type <= GNU_PROPERTY_X86_UINT32_AND_HI) | |
2463 | { | |
0afcef53 L |
2464 | /* Only one of APROP and BPROP can be NULL: |
2465 | 1. APROP & BPROP when both APROP and BPROP aren't NULL. | |
2466 | 2. If APROP is NULL, remove x86 feature. | |
2467 | 3. Otherwise, do nothing. | |
2468 | */ | |
2469 | if (aprop != NULL && bprop != NULL) | |
2470 | { | |
2471 | features = 0; | |
2472 | if (info->ibt) | |
2473 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2474 | if (info->shstk) | |
2475 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2476 | number = aprop->u.number; | |
2477 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2478 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2479 | aprop->u.number = (number & bprop->u.number) | features; | |
2480 | updated = number != (unsigned int) aprop->u.number; | |
2481 | /* Remove the property if all feature bits are cleared. */ | |
2482 | if (aprop->u.number == 0) | |
2483 | aprop->pr_kind = property_remove; | |
2484 | } | |
2485 | else | |
2486 | { | |
2487 | features = 0; | |
2488 | if (info->ibt) | |
2489 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2490 | if (info->shstk) | |
2491 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2492 | if (features) | |
2493 | { | |
2494 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2495 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2496 | if (aprop != NULL) | |
2497 | { | |
2498 | number = aprop->u.number; | |
2499 | aprop->u.number = number | features; | |
2500 | updated = number != (unsigned int) aprop->u.number; | |
2501 | } | |
2502 | else | |
2503 | { | |
2504 | bprop->u.number |= features; | |
2505 | updated = TRUE; | |
2506 | } | |
2507 | } | |
2508 | else if (aprop != NULL) | |
2509 | { | |
2510 | aprop->pr_kind = property_remove; | |
2511 | updated = TRUE; | |
2512 | } | |
2513 | } | |
a9eafb08 L |
2514 | return updated; |
2515 | } | |
2516 | else | |
2517 | { | |
0afcef53 L |
2518 | /* Never should happen. */ |
2519 | abort (); | |
2520 | } | |
2521 | ||
2522 | return updated; | |
2523 | } | |
a6798bab L |
2524 | |
2525 | /* Set up x86 GNU properties. Return the first relocatable ELF input | |
2526 | with GNU properties if found. Otherwise, return NULL. */ | |
2527 | ||
2528 | bfd * | |
2529 | _bfd_x86_elf_link_setup_gnu_properties | |
1de031c8 | 2530 | (struct bfd_link_info *info, struct elf_x86_init_table *init_table) |
a6798bab L |
2531 | { |
2532 | bfd_boolean normal_target; | |
2533 | bfd_boolean lazy_plt; | |
2534 | asection *sec, *pltsec; | |
2535 | bfd *dynobj; | |
2536 | bfd_boolean use_ibt_plt; | |
2537 | unsigned int plt_alignment, features; | |
2538 | struct elf_x86_link_hash_table *htab; | |
2539 | bfd *pbfd; | |
2540 | bfd *ebfd = NULL; | |
2541 | elf_property *prop; | |
2542 | const struct elf_backend_data *bed; | |
2543 | unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2; | |
2544 | unsigned int got_align; | |
241e64e3 | 2545 | bfd_boolean has_text = FALSE; |
a6798bab L |
2546 | |
2547 | features = 0; | |
2548 | if (info->ibt) | |
2549 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2550 | if (info->shstk) | |
2551 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2552 | ||
2553 | /* Find a normal input file with GNU property note. */ | |
2554 | for (pbfd = info->input_bfds; | |
2555 | pbfd != NULL; | |
2556 | pbfd = pbfd->link.next) | |
2557 | if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour | |
2558 | && bfd_count_sections (pbfd) != 0) | |
2559 | { | |
241e64e3 L |
2560 | if (!has_text) |
2561 | { | |
2562 | /* Check if there is no non-empty text section. */ | |
2563 | sec = bfd_get_section_by_name (pbfd, ".text"); | |
2564 | if (sec != NULL && sec->size != 0) | |
2565 | has_text = TRUE; | |
2566 | } | |
2567 | ||
a6798bab L |
2568 | ebfd = pbfd; |
2569 | ||
2570 | if (elf_properties (pbfd) != NULL) | |
2571 | break; | |
2572 | } | |
2573 | ||
241e64e3 L |
2574 | bed = get_elf_backend_data (info->output_bfd); |
2575 | ||
2576 | htab = elf_x86_hash_table (info, bed->target_id); | |
2577 | if (htab == NULL) | |
2578 | return pbfd; | |
2579 | ||
2580 | if (ebfd != NULL) | |
a6798bab | 2581 | { |
241e64e3 L |
2582 | prop = NULL; |
2583 | if (features) | |
2584 | { | |
2585 | /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2586 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2587 | prop = _bfd_elf_get_property (ebfd, | |
2588 | GNU_PROPERTY_X86_FEATURE_1_AND, | |
2589 | 4); | |
2590 | prop->u.number |= features; | |
2591 | prop->pr_kind = property_number; | |
2592 | } | |
2593 | else if (has_text | |
241e64e3 L |
2594 | && elf_tdata (info->output_bfd)->o->build_id.sec == NULL |
2595 | && !htab->elf.dynamic_sections_created | |
2596 | && !info->traditional_format | |
2597 | && (info->output_bfd->flags & D_PAGED) != 0 | |
2598 | && info->separate_code) | |
2599 | { | |
2600 | /* If the separate code program header is needed, make sure | |
2601 | that the first read-only PT_LOAD segment has no code by | |
a9eafb08 | 2602 | adding a GNU_PROPERTY_X86_FEATURE_2_NEEDED note. */ |
ab9e3428 L |
2603 | elf_property_list *list; |
2604 | bfd_boolean need_property = TRUE; | |
2605 | ||
2606 | for (list = elf_properties (ebfd); list; list = list->next) | |
a9eafb08 L |
2607 | { |
2608 | unsigned int pr_type = list->property.pr_type; | |
2609 | if (pr_type == GNU_PROPERTY_STACK_SIZE | |
2610 | || pr_type == GNU_PROPERTY_NO_COPY_ON_PROTECTED | |
2611 | || pr_type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED | |
2612 | || (pr_type >= GNU_PROPERTY_X86_UINT32_OR_LO | |
2613 | && pr_type <= GNU_PROPERTY_X86_UINT32_OR_HI)) | |
2614 | { | |
2615 | /* These properties won't be removed during merging. */ | |
2616 | need_property = FALSE; | |
2617 | break; | |
2618 | } | |
2619 | } | |
ab9e3428 L |
2620 | |
2621 | if (need_property) | |
2622 | { | |
a9eafb08 L |
2623 | prop = _bfd_elf_get_property |
2624 | (ebfd, GNU_PROPERTY_X86_FEATURE_2_NEEDED, 4); | |
2625 | prop->u.number = GNU_PROPERTY_X86_FEATURE_2_X86; | |
ab9e3428 L |
2626 | prop->pr_kind = property_number; |
2627 | } | |
241e64e3 | 2628 | } |
a6798bab L |
2629 | |
2630 | /* Create the GNU property note section if needed. */ | |
241e64e3 | 2631 | if (prop != NULL && pbfd == NULL) |
a6798bab L |
2632 | { |
2633 | sec = bfd_make_section_with_flags (ebfd, | |
2634 | NOTE_GNU_PROPERTY_SECTION_NAME, | |
2635 | (SEC_ALLOC | |
2636 | | SEC_LOAD | |
2637 | | SEC_IN_MEMORY | |
2638 | | SEC_READONLY | |
2639 | | SEC_HAS_CONTENTS | |
2640 | | SEC_DATA)); | |
2641 | if (sec == NULL) | |
2c244f9b | 2642 | info->callbacks->einfo (_("%F%P: failed to create GNU property section\n")); |
a6798bab L |
2643 | |
2644 | if (!bfd_set_section_alignment (ebfd, sec, class_align)) | |
2645 | { | |
2646 | error_alignment: | |
871b3ab2 | 2647 | info->callbacks->einfo (_("%F%pA: failed to align section\n"), |
a6798bab L |
2648 | sec); |
2649 | } | |
2650 | ||
2651 | elf_section_type (sec) = SHT_NOTE; | |
2652 | } | |
2653 | } | |
2654 | ||
2655 | pbfd = _bfd_elf_link_setup_gnu_properties (info); | |
2656 | ||
1de031c8 L |
2657 | htab->r_info = init_table->r_info; |
2658 | htab->r_sym = init_table->r_sym; | |
7a382c1c L |
2659 | |
2660 | if (bfd_link_relocatable (info)) | |
2661 | return pbfd; | |
eeb2f20a | 2662 | |
851b6fa1 L |
2663 | htab->plt0_pad_byte = init_table->plt0_pad_byte; |
2664 | ||
a6798bab L |
2665 | use_ibt_plt = info->ibtplt || info->ibt; |
2666 | if (!use_ibt_plt && pbfd != NULL) | |
2667 | { | |
2668 | /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */ | |
2669 | elf_property_list *p; | |
2670 | ||
2671 | /* The property list is sorted in order of type. */ | |
2672 | for (p = elf_properties (pbfd); p; p = p->next) | |
2673 | { | |
2674 | if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type) | |
2675 | { | |
2676 | use_ibt_plt = !!(p->property.u.number | |
2677 | & GNU_PROPERTY_X86_FEATURE_1_IBT); | |
2678 | break; | |
2679 | } | |
2680 | else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type) | |
2681 | break; | |
2682 | } | |
2683 | } | |
2684 | ||
2685 | dynobj = htab->elf.dynobj; | |
2686 | ||
2687 | /* Set htab->elf.dynobj here so that there is no need to check and | |
2688 | set it in check_relocs. */ | |
2689 | if (dynobj == NULL) | |
2690 | { | |
2691 | if (pbfd != NULL) | |
2692 | { | |
2693 | htab->elf.dynobj = pbfd; | |
2694 | dynobj = pbfd; | |
2695 | } | |
2696 | else | |
2697 | { | |
2698 | bfd *abfd; | |
2699 | ||
2700 | /* Find a normal input file to hold linker created | |
2701 | sections. */ | |
2702 | for (abfd = info->input_bfds; | |
2703 | abfd != NULL; | |
2704 | abfd = abfd->link.next) | |
2705 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour | |
2706 | && (abfd->flags | |
e4e6a73d L |
2707 | & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0 |
2708 | && bed->relocs_compatible (abfd->xvec, | |
2709 | info->output_bfd->xvec)) | |
a6798bab L |
2710 | { |
2711 | htab->elf.dynobj = abfd; | |
2712 | dynobj = abfd; | |
2713 | break; | |
2714 | } | |
2715 | } | |
2716 | } | |
2717 | ||
851b6fa1 L |
2718 | /* Return if there are no normal input files. */ |
2719 | if (dynobj == NULL) | |
2720 | return pbfd; | |
2721 | ||
a6798bab L |
2722 | /* Even when lazy binding is disabled by "-z now", the PLT0 entry may |
2723 | still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for | |
2724 | canonical function address. */ | |
2725 | htab->plt.has_plt0 = 1; | |
851b6fa1 | 2726 | normal_target = htab->target_os == is_normal; |
a6798bab L |
2727 | |
2728 | if (normal_target) | |
2729 | { | |
2730 | if (use_ibt_plt) | |
2731 | { | |
1de031c8 L |
2732 | htab->lazy_plt = init_table->lazy_ibt_plt; |
2733 | htab->non_lazy_plt = init_table->non_lazy_ibt_plt; | |
a6798bab L |
2734 | } |
2735 | else | |
2736 | { | |
1de031c8 L |
2737 | htab->lazy_plt = init_table->lazy_plt; |
2738 | htab->non_lazy_plt = init_table->non_lazy_plt; | |
a6798bab L |
2739 | } |
2740 | } | |
2741 | else | |
2742 | { | |
1de031c8 | 2743 | htab->lazy_plt = init_table->lazy_plt; |
a6798bab L |
2744 | htab->non_lazy_plt = NULL; |
2745 | } | |
2746 | ||
2747 | pltsec = htab->elf.splt; | |
2748 | ||
2749 | /* If the non-lazy PLT is available, use it for all PLT entries if | |
2750 | there are no PLT0 or no .plt section. */ | |
2751 | if (htab->non_lazy_plt != NULL | |
2752 | && (!htab->plt.has_plt0 || pltsec == NULL)) | |
2753 | { | |
2754 | lazy_plt = FALSE; | |
2755 | if (bfd_link_pic (info)) | |
2756 | htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry; | |
2757 | else | |
2758 | htab->plt.plt_entry = htab->non_lazy_plt->plt_entry; | |
2759 | htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size; | |
2760 | htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset; | |
2761 | htab->plt.plt_got_insn_size | |
2762 | = htab->non_lazy_plt->plt_got_insn_size; | |
2763 | htab->plt.eh_frame_plt_size | |
2764 | = htab->non_lazy_plt->eh_frame_plt_size; | |
2765 | htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt; | |
2766 | } | |
2767 | else | |
2768 | { | |
2769 | lazy_plt = TRUE; | |
2770 | if (bfd_link_pic (info)) | |
2771 | { | |
2772 | htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry; | |
2773 | htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry; | |
2774 | } | |
2775 | else | |
2776 | { | |
2777 | htab->plt.plt0_entry = htab->lazy_plt->plt0_entry; | |
2778 | htab->plt.plt_entry = htab->lazy_plt->plt_entry; | |
2779 | } | |
2780 | htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size; | |
2781 | htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset; | |
2782 | htab->plt.plt_got_insn_size | |
2783 | = htab->lazy_plt->plt_got_insn_size; | |
2784 | htab->plt.eh_frame_plt_size | |
2785 | = htab->lazy_plt->eh_frame_plt_size; | |
2786 | htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt; | |
2787 | } | |
2788 | ||
851b6fa1 | 2789 | if (htab->target_os == is_vxworks |
a6798bab L |
2790 | && !elf_vxworks_create_dynamic_sections (dynobj, info, |
2791 | &htab->srelplt2)) | |
2792 | { | |
2c244f9b | 2793 | info->callbacks->einfo (_("%F%P: failed to create VxWorks dynamic sections\n")); |
a6798bab L |
2794 | return pbfd; |
2795 | } | |
2796 | ||
2797 | /* Since create_dynamic_sections isn't always called, but GOT | |
2798 | relocations need GOT relocations, create them here so that we | |
2799 | don't need to do it in check_relocs. */ | |
2800 | if (htab->elf.sgot == NULL | |
2801 | && !_bfd_elf_create_got_section (dynobj, info)) | |
2c244f9b | 2802 | info->callbacks->einfo (_("%F%P: failed to create GOT sections\n")); |
a6798bab L |
2803 | |
2804 | got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2; | |
2805 | ||
2806 | /* Align .got and .got.plt sections to their entry size. Do it here | |
2807 | instead of in create_dynamic_sections so that they are always | |
2808 | properly aligned even if create_dynamic_sections isn't called. */ | |
2809 | sec = htab->elf.sgot; | |
2810 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2811 | goto error_alignment; | |
2812 | ||
2813 | sec = htab->elf.sgotplt; | |
2814 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2815 | goto error_alignment; | |
2816 | ||
2817 | /* Create the ifunc sections here so that check_relocs can be | |
2818 | simplified. */ | |
2819 | if (!_bfd_elf_create_ifunc_sections (dynobj, info)) | |
2c244f9b | 2820 | info->callbacks->einfo (_("%F%P: failed to create ifunc sections\n")); |
a6798bab L |
2821 | |
2822 | plt_alignment = bfd_log2 (htab->plt.plt_entry_size); | |
2823 | ||
2824 | if (pltsec != NULL) | |
2825 | { | |
2826 | /* Whe creating executable, set the contents of the .interp | |
2827 | section to the interpreter. */ | |
2828 | if (bfd_link_executable (info) && !info->nointerp) | |
2829 | { | |
2830 | asection *s = bfd_get_linker_section (dynobj, ".interp"); | |
2831 | if (s == NULL) | |
2832 | abort (); | |
2833 | s->size = htab->dynamic_interpreter_size; | |
2834 | s->contents = (unsigned char *) htab->dynamic_interpreter; | |
2835 | htab->interp = s; | |
2836 | } | |
2837 | ||
2838 | /* Don't change PLT section alignment for NaCl since it uses | |
2839 | 64-byte PLT entry and sets PLT section alignment to 32 | |
2840 | bytes. Don't create additional PLT sections for NaCl. */ | |
2841 | if (normal_target) | |
2842 | { | |
2843 | flagword pltflags = (bed->dynamic_sec_flags | |
2844 | | SEC_ALLOC | |
2845 | | SEC_CODE | |
2846 | | SEC_LOAD | |
2847 | | SEC_READONLY); | |
2848 | unsigned int non_lazy_plt_alignment | |
2849 | = bfd_log2 (htab->non_lazy_plt->plt_entry_size); | |
2850 | ||
2851 | sec = pltsec; | |
2852 | if (!bfd_set_section_alignment (sec->owner, sec, | |
2853 | plt_alignment)) | |
2854 | goto error_alignment; | |
2855 | ||
2856 | /* Create the GOT procedure linkage table. */ | |
2857 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2858 | ".plt.got", | |
2859 | pltflags); | |
2860 | if (sec == NULL) | |
2c244f9b | 2861 | info->callbacks->einfo (_("%F%P: failed to create GOT PLT section\n")); |
a6798bab L |
2862 | |
2863 | if (!bfd_set_section_alignment (dynobj, sec, | |
2864 | non_lazy_plt_alignment)) | |
2865 | goto error_alignment; | |
2866 | ||
2867 | htab->plt_got = sec; | |
2868 | ||
2869 | if (lazy_plt) | |
2870 | { | |
2871 | sec = NULL; | |
2872 | ||
2873 | if (use_ibt_plt) | |
2874 | { | |
2875 | /* Create the second PLT for Intel IBT support. IBT | |
2876 | PLT is supported only for non-NaCl target and is | |
2877 | is needed only for lazy binding. */ | |
2878 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2879 | ".plt.sec", | |
2880 | pltflags); | |
2881 | if (sec == NULL) | |
2c244f9b | 2882 | info->callbacks->einfo (_("%F%P: failed to create IBT-enabled PLT section\n")); |
a6798bab L |
2883 | |
2884 | if (!bfd_set_section_alignment (dynobj, sec, | |
2885 | plt_alignment)) | |
2886 | goto error_alignment; | |
2887 | } | |
2888 | else if (info->bndplt && ABI_64_P (dynobj)) | |
2889 | { | |
2890 | /* Create the second PLT for Intel MPX support. MPX | |
2891 | PLT is supported only for non-NaCl target in 64-bit | |
2892 | mode and is needed only for lazy binding. */ | |
2893 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2894 | ".plt.sec", | |
2895 | pltflags); | |
2896 | if (sec == NULL) | |
2c244f9b | 2897 | info->callbacks->einfo (_("%F%P: failed to create BND PLT section\n")); |
a6798bab L |
2898 | |
2899 | if (!bfd_set_section_alignment (dynobj, sec, | |
2900 | non_lazy_plt_alignment)) | |
2901 | goto error_alignment; | |
2902 | } | |
2903 | ||
2904 | htab->plt_second = sec; | |
2905 | } | |
2906 | } | |
2907 | ||
2908 | if (!info->no_ld_generated_unwind_info) | |
2909 | { | |
2910 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | |
2911 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
2912 | | SEC_LINKER_CREATED); | |
2913 | ||
2914 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2915 | ".eh_frame", | |
2916 | flags); | |
2917 | if (sec == NULL) | |
2c244f9b | 2918 | info->callbacks->einfo (_("%F%P: failed to create PLT .eh_frame section\n")); |
a6798bab L |
2919 | |
2920 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2921 | goto error_alignment; | |
2922 | ||
2923 | htab->plt_eh_frame = sec; | |
2924 | ||
2925 | if (htab->plt_got != NULL) | |
2926 | { | |
2927 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2928 | ".eh_frame", | |
2929 | flags); | |
2930 | if (sec == NULL) | |
2c244f9b | 2931 | info->callbacks->einfo (_("%F%P: failed to create GOT PLT .eh_frame section\n")); |
a6798bab L |
2932 | |
2933 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2934 | goto error_alignment; | |
2935 | ||
2936 | htab->plt_got_eh_frame = sec; | |
2937 | } | |
2938 | ||
2939 | if (htab->plt_second != NULL) | |
2940 | { | |
2941 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2942 | ".eh_frame", | |
2943 | flags); | |
2944 | if (sec == NULL) | |
2c244f9b | 2945 | info->callbacks->einfo (_("%F%P: failed to create the second PLT .eh_frame section\n")); |
a6798bab L |
2946 | |
2947 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2948 | goto error_alignment; | |
2949 | ||
2950 | htab->plt_second_eh_frame = sec; | |
2951 | } | |
2952 | } | |
2953 | } | |
2954 | ||
2955 | if (normal_target) | |
2956 | { | |
2957 | /* The .iplt section is used for IFUNC symbols in static | |
2958 | executables. */ | |
2959 | sec = htab->elf.iplt; | |
2960 | if (sec != NULL | |
2961 | && !bfd_set_section_alignment (sec->owner, sec, | |
2962 | plt_alignment)) | |
2963 | goto error_alignment; | |
2964 | } | |
2965 | ||
2966 | return pbfd; | |
2967 | } | |
bfb1e8c1 L |
2968 | |
2969 | /* Fix up x86 GNU properties. */ | |
2970 | ||
2971 | void | |
aa7bca9b L |
2972 | _bfd_x86_elf_link_fixup_gnu_properties (struct bfd_link_info *info, |
2973 | elf_property_list **listp) | |
bfb1e8c1 L |
2974 | { |
2975 | elf_property_list *p; | |
2976 | ||
2977 | for (p = *listp; p; p = p->next) | |
a9eafb08 L |
2978 | { |
2979 | unsigned int type = p->property.pr_type; | |
2980 | if (type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED | |
2981 | || type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED | |
2982 | || (type >= GNU_PROPERTY_X86_UINT32_AND_LO | |
2983 | && type <= GNU_PROPERTY_X86_UINT32_AND_HI) | |
2984 | || (type >= GNU_PROPERTY_X86_UINT32_OR_LO | |
2985 | && type <= GNU_PROPERTY_X86_UINT32_OR_HI) | |
2986 | || (type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO | |
2987 | && type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI)) | |
2988 | { | |
2989 | if (p->property.u.number == 0) | |
2990 | { | |
2991 | /* Remove empty property. */ | |
2992 | *listp = p->next; | |
2993 | continue; | |
2994 | } | |
aa7bca9b | 2995 | |
a9eafb08 L |
2996 | /* Mark x86-specific properties with X86_UINT32_VALID for |
2997 | non-relocatable output. */ | |
2998 | if (!bfd_link_relocatable (info)) | |
2999 | p->property.u.number |= GNU_PROPERTY_X86_UINT32_VALID; | |
aa7bca9b | 3000 | |
a9eafb08 L |
3001 | listp = &p->next; |
3002 | } | |
3003 | else if (type > GNU_PROPERTY_HIPROC) | |
3004 | { | |
3005 | /* The property list is sorted in order of type. */ | |
3006 | break; | |
3007 | } | |
3008 | } | |
bfb1e8c1 | 3009 | } |