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0afcef53 L |
1 | /* x86 specific support for ELF |
2 | Copyright (C) 2017 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "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 L |
85 | static bfd_boolean |
86 | elf_x86_allocate_dynrelocs (struct elf_link_hash_entry *h, | |
b9ce864c L |
87 | void *inf) |
88 | { | |
89 | struct bfd_link_info *info; | |
90 | struct elf_x86_link_hash_table *htab; | |
91 | struct elf_x86_link_hash_entry *eh; | |
92 | struct elf_dyn_relocs *p; | |
93 | unsigned int plt_entry_size; | |
94 | bfd_boolean resolved_to_zero; | |
95 | const struct elf_backend_data *bed; | |
96 | ||
97 | if (h->root.type == bfd_link_hash_indirect) | |
98 | return TRUE; | |
99 | ||
100 | eh = (struct elf_x86_link_hash_entry *) h; | |
101 | ||
102 | info = (struct bfd_link_info *) inf; | |
103 | bed = get_elf_backend_data (info->output_bfd); | |
104 | htab = elf_x86_hash_table (info, bed->target_id); | |
105 | if (htab == NULL) | |
106 | return FALSE; | |
107 | ||
108 | plt_entry_size = htab->plt.plt_entry_size; | |
109 | ||
110 | resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, | |
111 | bed->target_id, | |
112 | eh->has_got_reloc, | |
113 | eh); | |
114 | ||
115 | /* Clear the reference count of function pointer relocations if | |
116 | symbol isn't a normal function. */ | |
117 | if (h->type != STT_FUNC) | |
118 | eh->func_pointer_refcount = 0; | |
119 | ||
120 | /* We can't use the GOT PLT if pointer equality is needed since | |
121 | finish_dynamic_symbol won't clear symbol value and the dynamic | |
122 | linker won't update the GOT slot. We will get into an infinite | |
123 | loop at run-time. */ | |
124 | if (htab->plt_got != NULL | |
125 | && h->type != STT_GNU_IFUNC | |
126 | && !h->pointer_equality_needed | |
127 | && h->plt.refcount > 0 | |
128 | && h->got.refcount > 0) | |
129 | { | |
130 | /* Don't use the regular PLT if there are both GOT and GOTPLT | |
131 | reloctions. */ | |
132 | h->plt.offset = (bfd_vma) -1; | |
133 | ||
134 | /* Use the GOT PLT. */ | |
135 | eh->plt_got.refcount = 1; | |
136 | } | |
137 | ||
138 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
139 | here if it is defined and referenced in a non-shared object. */ | |
140 | if (h->type == STT_GNU_IFUNC | |
141 | && h->def_regular) | |
142 | { | |
143 | if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, | |
144 | &htab->readonly_dynrelocs_against_ifunc, | |
145 | plt_entry_size, | |
146 | (htab->plt.has_plt0 | |
147 | * plt_entry_size), | |
148 | htab->got_entry_size, | |
149 | TRUE)) | |
150 | { | |
151 | asection *s = htab->plt_second; | |
152 | if (h->plt.offset != (bfd_vma) -1 && s != NULL) | |
153 | { | |
154 | /* Use the second PLT section if it is created. */ | |
155 | eh->plt_second.offset = s->size; | |
156 | ||
157 | /* Make room for this entry in the second PLT section. */ | |
158 | s->size += htab->non_lazy_plt->plt_entry_size; | |
159 | } | |
160 | ||
161 | return TRUE; | |
162 | } | |
163 | else | |
164 | return FALSE; | |
165 | } | |
166 | /* Don't create the PLT entry if there are only function pointer | |
167 | relocations which can be resolved at run-time. */ | |
168 | else if (htab->elf.dynamic_sections_created | |
169 | && (h->plt.refcount > eh->func_pointer_refcount | |
170 | || eh->plt_got.refcount > 0)) | |
171 | { | |
172 | bfd_boolean use_plt_got = eh->plt_got.refcount > 0; | |
173 | ||
174 | /* Clear the reference count of function pointer relocations | |
175 | if PLT is used. */ | |
176 | eh->func_pointer_refcount = 0; | |
177 | ||
178 | /* Make sure this symbol is output as a dynamic symbol. | |
179 | Undefined weak syms won't yet be marked as dynamic. */ | |
180 | if (h->dynindx == -1 | |
181 | && !h->forced_local | |
182 | && !resolved_to_zero | |
183 | && h->root.type == bfd_link_hash_undefweak) | |
184 | { | |
185 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
186 | return FALSE; | |
187 | } | |
188 | ||
189 | if (bfd_link_pic (info) | |
190 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) | |
191 | { | |
192 | asection *s = htab->elf.splt; | |
193 | asection *second_s = htab->plt_second; | |
194 | asection *got_s = htab->plt_got; | |
195 | ||
196 | /* If this is the first .plt entry, make room for the special | |
197 | first entry. The .plt section is used by prelink to undo | |
198 | prelinking for dynamic relocations. */ | |
199 | if (s->size == 0) | |
200 | s->size = htab->plt.has_plt0 * plt_entry_size; | |
201 | ||
202 | if (use_plt_got) | |
203 | eh->plt_got.offset = got_s->size; | |
204 | else | |
205 | { | |
206 | h->plt.offset = s->size; | |
207 | if (second_s) | |
208 | eh->plt_second.offset = second_s->size; | |
209 | } | |
210 | ||
211 | /* If this symbol is not defined in a regular file, and we are | |
212 | not generating a shared library, then set the symbol to this | |
213 | location in the .plt. This is required to make function | |
214 | pointers compare as equal between the normal executable and | |
215 | the shared library. */ | |
216 | if (! bfd_link_pic (info) | |
217 | && !h->def_regular) | |
218 | { | |
219 | if (use_plt_got) | |
220 | { | |
221 | /* We need to make a call to the entry of the GOT PLT | |
222 | instead of regular PLT entry. */ | |
223 | h->root.u.def.section = got_s; | |
224 | h->root.u.def.value = eh->plt_got.offset; | |
225 | } | |
226 | else | |
227 | { | |
228 | if (second_s) | |
229 | { | |
230 | /* We need to make a call to the entry of the | |
231 | second PLT instead of regular PLT entry. */ | |
232 | h->root.u.def.section = second_s; | |
233 | h->root.u.def.value = eh->plt_second.offset; | |
234 | } | |
235 | else | |
236 | { | |
237 | h->root.u.def.section = s; | |
238 | h->root.u.def.value = h->plt.offset; | |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | /* Make room for this entry. */ | |
244 | if (use_plt_got) | |
245 | got_s->size += htab->non_lazy_plt->plt_entry_size; | |
246 | else | |
247 | { | |
248 | s->size += plt_entry_size; | |
249 | if (second_s) | |
250 | second_s->size += htab->non_lazy_plt->plt_entry_size; | |
251 | ||
252 | /* We also need to make an entry in the .got.plt section, | |
253 | which will be placed in the .got section by the linker | |
254 | script. */ | |
255 | htab->elf.sgotplt->size += htab->got_entry_size; | |
256 | ||
257 | /* There should be no PLT relocation against resolved | |
258 | undefined weak symbol in executable. */ | |
259 | if (!resolved_to_zero) | |
260 | { | |
261 | /* We also need to make an entry in the .rel.plt | |
262 | section. */ | |
263 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
264 | htab->elf.srelplt->reloc_count++; | |
265 | } | |
266 | } | |
267 | ||
268 | if (htab->is_vxworks && !bfd_link_pic (info)) | |
269 | { | |
270 | /* VxWorks has a second set of relocations for each PLT entry | |
271 | in executables. They go in a separate relocation section, | |
272 | which is processed by the kernel loader. */ | |
273 | ||
274 | /* There are two relocations for the initial PLT entry: an | |
275 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an | |
276 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ | |
277 | ||
278 | asection *srelplt2 = htab->srelplt2; | |
279 | if (h->plt.offset == plt_entry_size) | |
280 | srelplt2->size += (htab->sizeof_reloc * 2); | |
281 | ||
282 | /* There are two extra relocations for each subsequent PLT entry: | |
283 | an R_386_32 relocation for the GOT entry, and an R_386_32 | |
284 | relocation for the PLT entry. */ | |
285 | ||
286 | srelplt2->size += (htab->sizeof_reloc * 2); | |
287 | } | |
288 | } | |
289 | else | |
290 | { | |
291 | eh->plt_got.offset = (bfd_vma) -1; | |
292 | h->plt.offset = (bfd_vma) -1; | |
293 | h->needs_plt = 0; | |
294 | } | |
295 | } | |
296 | else | |
297 | { | |
298 | eh->plt_got.offset = (bfd_vma) -1; | |
299 | h->plt.offset = (bfd_vma) -1; | |
300 | h->needs_plt = 0; | |
301 | } | |
302 | ||
303 | eh->tlsdesc_got = (bfd_vma) -1; | |
304 | ||
305 | /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the | |
306 | binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For | |
307 | x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary, | |
308 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ | |
309 | if (h->got.refcount > 0 | |
310 | && bfd_link_executable (info) | |
311 | && h->dynindx == -1 | |
312 | && (elf_x86_hash_entry (h)->tls_type & GOT_TLS_IE)) | |
313 | h->got.offset = (bfd_vma) -1; | |
314 | else if (h->got.refcount > 0) | |
315 | { | |
316 | asection *s; | |
317 | bfd_boolean dyn; | |
318 | int tls_type = elf_x86_hash_entry (h)->tls_type; | |
319 | ||
320 | /* Make sure this symbol is output as a dynamic symbol. | |
321 | Undefined weak syms won't yet be marked as dynamic. */ | |
322 | if (h->dynindx == -1 | |
323 | && !h->forced_local | |
324 | && !resolved_to_zero | |
325 | && h->root.type == bfd_link_hash_undefweak) | |
326 | { | |
327 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
328 | return FALSE; | |
329 | } | |
330 | ||
331 | s = htab->elf.sgot; | |
332 | if (GOT_TLS_GDESC_P (tls_type)) | |
333 | { | |
334 | eh->tlsdesc_got = htab->elf.sgotplt->size | |
335 | - elf_x86_compute_jump_table_size (htab); | |
336 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
337 | h->got.offset = (bfd_vma) -2; | |
338 | } | |
339 | if (! GOT_TLS_GDESC_P (tls_type) | |
340 | || GOT_TLS_GD_P (tls_type)) | |
341 | { | |
342 | h->got.offset = s->size; | |
343 | s->size += htab->got_entry_size; | |
344 | /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT | |
345 | slots. */ | |
346 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) | |
347 | s->size += htab->got_entry_size; | |
348 | } | |
349 | dyn = htab->elf.dynamic_sections_created; | |
350 | /* R_386_TLS_IE_32 needs one dynamic relocation, | |
351 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, | |
352 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we | |
353 | need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local | |
354 | symbol and two if global. No dynamic relocation against | |
355 | resolved undefined weak symbol in executable. */ | |
356 | if (tls_type == GOT_TLS_IE_BOTH) | |
357 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
358 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) | |
359 | || (tls_type & GOT_TLS_IE)) | |
360 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
361 | else if (GOT_TLS_GD_P (tls_type)) | |
362 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
363 | else if (! GOT_TLS_GDESC_P (tls_type) | |
364 | && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
365 | && !resolved_to_zero) | |
366 | || h->root.type != bfd_link_hash_undefweak) | |
367 | && (bfd_link_pic (info) | |
368 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) | |
369 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
370 | if (GOT_TLS_GDESC_P (tls_type)) | |
371 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
372 | } | |
373 | else | |
374 | h->got.offset = (bfd_vma) -1; | |
375 | ||
376 | if (eh->dyn_relocs == NULL) | |
377 | return TRUE; | |
378 | ||
379 | /* In the shared -Bsymbolic case, discard space allocated for | |
380 | dynamic pc-relative relocs against symbols which turn out to be | |
381 | defined in regular objects. For the normal shared case, discard | |
382 | space for pc-relative relocs that have become local due to symbol | |
383 | visibility changes. */ | |
384 | ||
385 | if (bfd_link_pic (info)) | |
386 | { | |
387 | /* Relocs that use pc_count are those that appear on a call | |
388 | insn, or certain REL relocs that can generated via assembly. | |
389 | We want calls to protected symbols to resolve directly to the | |
390 | function rather than going via the plt. If people want | |
391 | function pointer comparisons to work as expected then they | |
392 | should avoid writing weird assembly. */ | |
393 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
394 | { | |
395 | struct elf_dyn_relocs **pp; | |
396 | ||
397 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
398 | { | |
399 | p->count -= p->pc_count; | |
400 | p->pc_count = 0; | |
401 | if (p->count == 0) | |
402 | *pp = p->next; | |
403 | else | |
404 | pp = &p->next; | |
405 | } | |
406 | } | |
407 | ||
408 | if (htab->is_vxworks) | |
409 | { | |
410 | struct elf_dyn_relocs **pp; | |
411 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
412 | { | |
413 | if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) | |
414 | *pp = p->next; | |
415 | else | |
416 | pp = &p->next; | |
417 | } | |
418 | } | |
419 | ||
420 | /* Also discard relocs on undefined weak syms with non-default | |
421 | visibility or in PIE. */ | |
422 | if (eh->dyn_relocs != NULL) | |
423 | { | |
424 | if (h->root.type == bfd_link_hash_undefweak) | |
425 | { | |
426 | /* Undefined weak symbol is never bound locally in shared | |
427 | library. */ | |
428 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
429 | || resolved_to_zero) | |
430 | { | |
431 | if (bed->target_id == I386_ELF_DATA | |
432 | && h->non_got_ref) | |
433 | { | |
434 | /* Keep dynamic non-GOT/non-PLT relocation so | |
435 | that we can branch to 0 without PLT. */ | |
436 | struct elf_dyn_relocs **pp; | |
437 | ||
438 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
439 | if (p->pc_count == 0) | |
440 | *pp = p->next; | |
441 | else | |
442 | { | |
443 | /* Remove non-R_386_PC32 relocation. */ | |
444 | p->count = p->pc_count; | |
445 | pp = &p->next; | |
446 | } | |
447 | ||
448 | /* Make sure undefined weak symbols are output | |
449 | as dynamic symbols in PIEs for dynamic non-GOT | |
450 | non-PLT reloations. */ | |
451 | if (eh->dyn_relocs != NULL | |
452 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
453 | return FALSE; | |
454 | } | |
455 | else | |
456 | eh->dyn_relocs = NULL; | |
457 | } | |
458 | else if (h->dynindx == -1 | |
459 | && !h->forced_local | |
460 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
461 | return FALSE; | |
462 | } | |
463 | else if (bfd_link_executable (info) | |
464 | && (h->needs_copy || eh->needs_copy) | |
465 | && h->def_dynamic | |
466 | && !h->def_regular) | |
467 | { | |
468 | /* NB: needs_copy is set only for x86-64. For PIE, | |
469 | discard space for pc-relative relocs against symbols | |
470 | which turn out to need copy relocs. */ | |
471 | struct elf_dyn_relocs **pp; | |
472 | ||
473 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
474 | { | |
475 | if (p->pc_count != 0) | |
476 | *pp = p->next; | |
477 | else | |
478 | pp = &p->next; | |
479 | } | |
480 | } | |
481 | } | |
482 | } | |
483 | else if (ELIMINATE_COPY_RELOCS) | |
484 | { | |
485 | /* For the non-shared case, discard space for relocs against | |
486 | symbols which turn out to need copy relocs or are not | |
487 | dynamic. Keep dynamic relocations for run-time function | |
488 | pointer initialization. */ | |
489 | ||
490 | if ((!h->non_got_ref | |
491 | || eh->func_pointer_refcount > 0 | |
492 | || (h->root.type == bfd_link_hash_undefweak | |
493 | && !resolved_to_zero)) | |
494 | && ((h->def_dynamic | |
495 | && !h->def_regular) | |
496 | || (htab->elf.dynamic_sections_created | |
497 | && (h->root.type == bfd_link_hash_undefweak | |
498 | || h->root.type == bfd_link_hash_undefined)))) | |
499 | { | |
500 | /* Make sure this symbol is output as a dynamic symbol. | |
501 | Undefined weak syms won't yet be marked as dynamic. */ | |
502 | if (h->dynindx == -1 | |
503 | && !h->forced_local | |
504 | && !resolved_to_zero | |
505 | && h->root.type == bfd_link_hash_undefweak | |
506 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
507 | return FALSE; | |
508 | ||
509 | /* If that succeeded, we know we'll be keeping all the | |
510 | relocs. */ | |
511 | if (h->dynindx != -1) | |
512 | goto keep; | |
513 | } | |
514 | ||
515 | eh->dyn_relocs = NULL; | |
516 | eh->func_pointer_refcount = 0; | |
517 | ||
518 | keep: ; | |
519 | } | |
520 | ||
521 | /* Finally, allocate space. */ | |
522 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
523 | { | |
524 | asection *sreloc; | |
525 | ||
526 | sreloc = elf_section_data (p->sec)->sreloc; | |
527 | ||
528 | BFD_ASSERT (sreloc != NULL); | |
529 | sreloc->size += p->count * htab->sizeof_reloc; | |
530 | } | |
531 | ||
532 | return TRUE; | |
533 | } | |
534 | ||
0afcef53 L |
535 | /* Find any dynamic relocs that apply to read-only sections. */ |
536 | ||
537 | bfd_boolean | |
538 | _bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry *h, | |
539 | void *inf) | |
540 | { | |
541 | struct elf_x86_link_hash_entry *eh; | |
542 | struct elf_dyn_relocs *p; | |
543 | ||
544 | /* Skip local IFUNC symbols. */ | |
545 | if (h->forced_local && h->type == STT_GNU_IFUNC) | |
546 | return TRUE; | |
547 | ||
548 | eh = (struct elf_x86_link_hash_entry *) h; | |
549 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
550 | { | |
551 | asection *s = p->sec->output_section; | |
552 | ||
553 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
554 | { | |
555 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
556 | ||
557 | info->flags |= DF_TEXTREL; | |
558 | ||
559 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
560 | || info->error_textrel) | |
561 | /* xgettext:c-format */ | |
562 | info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"), | |
563 | p->sec->owner, h->root.root.string, | |
564 | p->sec); | |
565 | ||
566 | /* Not an error, just cut short the traversal. */ | |
567 | return FALSE; | |
568 | } | |
569 | } | |
570 | return TRUE; | |
571 | } | |
572 | ||
b9ce864c L |
573 | /* Allocate space in .plt, .got and associated reloc sections for |
574 | local dynamic relocs. */ | |
575 | ||
5e2ac45d L |
576 | static bfd_boolean |
577 | elf_x86_allocate_local_dynreloc (void **slot, void *inf) | |
b9ce864c L |
578 | { |
579 | struct elf_link_hash_entry *h | |
580 | = (struct elf_link_hash_entry *) *slot; | |
581 | ||
582 | if (h->type != STT_GNU_IFUNC | |
583 | || !h->def_regular | |
584 | || !h->ref_regular | |
585 | || !h->forced_local | |
586 | || h->root.type != bfd_link_hash_defined) | |
587 | abort (); | |
588 | ||
5e2ac45d | 589 | return elf_x86_allocate_dynrelocs (h, inf); |
b9ce864c L |
590 | } |
591 | ||
0afcef53 L |
592 | /* Find and/or create a hash entry for local symbol. */ |
593 | ||
594 | struct elf_link_hash_entry * | |
595 | _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab, | |
596 | bfd *abfd, const Elf_Internal_Rela *rel, | |
597 | bfd_boolean create) | |
598 | { | |
599 | struct elf_x86_link_hash_entry e, *ret; | |
600 | asection *sec = abfd->sections; | |
601 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
602 | htab->r_sym (rel->r_info)); | |
603 | void **slot; | |
604 | ||
605 | e.elf.indx = sec->id; | |
606 | e.elf.dynstr_index = htab->r_sym (rel->r_info); | |
607 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
608 | create ? INSERT : NO_INSERT); | |
609 | ||
610 | if (!slot) | |
611 | return NULL; | |
612 | ||
613 | if (*slot) | |
614 | { | |
615 | ret = (struct elf_x86_link_hash_entry *) *slot; | |
616 | return &ret->elf; | |
617 | } | |
618 | ||
619 | ret = (struct elf_x86_link_hash_entry *) | |
620 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
621 | sizeof (struct elf_x86_link_hash_entry)); | |
622 | if (ret) | |
623 | { | |
624 | memset (ret, 0, sizeof (*ret)); | |
625 | ret->elf.indx = sec->id; | |
626 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); | |
627 | ret->elf.dynindx = -1; | |
628 | ret->plt_got.offset = (bfd_vma) -1; | |
629 | *slot = ret; | |
630 | } | |
631 | return &ret->elf; | |
632 | } | |
633 | ||
634 | /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN | |
635 | SYNC WITH _bfd_elf_link_hash_newfunc. */ | |
636 | ||
637 | struct bfd_hash_entry * | |
638 | _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry, | |
639 | struct bfd_hash_table *table, | |
640 | const char *string) | |
641 | { | |
642 | /* Allocate the structure if it has not already been allocated by a | |
643 | subclass. */ | |
644 | if (entry == NULL) | |
645 | { | |
646 | entry = (struct bfd_hash_entry *) | |
647 | bfd_hash_allocate (table, | |
648 | sizeof (struct elf_x86_link_hash_entry)); | |
649 | if (entry == NULL) | |
650 | return entry; | |
651 | } | |
652 | ||
653 | /* Call the allocation method of the superclass. */ | |
654 | entry = _bfd_link_hash_newfunc (entry, table, string); | |
655 | if (entry != NULL) | |
656 | { | |
657 | struct elf_x86_link_hash_entry *eh | |
658 | = (struct elf_x86_link_hash_entry *) entry; | |
659 | struct elf_link_hash_table *htab | |
660 | = (struct elf_link_hash_table *) table; | |
661 | ||
662 | memset (&eh->elf.size, 0, | |
663 | (sizeof (struct elf_x86_link_hash_entry) | |
664 | - offsetof (struct elf_link_hash_entry, size))); | |
665 | /* Set local fields. */ | |
666 | eh->elf.indx = -1; | |
667 | eh->elf.dynindx = -1; | |
668 | eh->elf.got = htab->init_got_refcount; | |
669 | eh->elf.plt = htab->init_plt_refcount; | |
670 | /* Assume that we have been called by a non-ELF symbol reader. | |
671 | This flag is then reset by the code which reads an ELF input | |
672 | file. This ensures that a symbol created by a non-ELF symbol | |
673 | reader will have the flag set correctly. */ | |
674 | eh->elf.non_elf = 1; | |
675 | eh->plt_second.offset = (bfd_vma) -1; | |
676 | eh->plt_got.offset = (bfd_vma) -1; | |
677 | eh->tlsdesc_got = (bfd_vma) -1; | |
678 | } | |
679 | ||
680 | return entry; | |
681 | } | |
682 | ||
683 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
684 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
685 | as global symbol. We reuse indx and dynstr_index for local symbol | |
686 | hash since they aren't used by global symbols in this backend. */ | |
687 | ||
688 | hashval_t | |
689 | _bfd_x86_elf_local_htab_hash (const void *ptr) | |
690 | { | |
691 | struct elf_link_hash_entry *h | |
692 | = (struct elf_link_hash_entry *) ptr; | |
693 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
694 | } | |
695 | ||
696 | /* Compare local hash entries. */ | |
697 | ||
698 | int | |
699 | _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
700 | { | |
701 | struct elf_link_hash_entry *h1 | |
702 | = (struct elf_link_hash_entry *) ptr1; | |
703 | struct elf_link_hash_entry *h2 | |
704 | = (struct elf_link_hash_entry *) ptr2; | |
705 | ||
706 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
707 | } | |
708 | ||
709 | /* Destroy an x86 ELF linker hash table. */ | |
710 | ||
765e526c L |
711 | static void |
712 | elf_x86_link_hash_table_free (bfd *obfd) | |
0afcef53 L |
713 | { |
714 | struct elf_x86_link_hash_table *htab | |
715 | = (struct elf_x86_link_hash_table *) obfd->link.hash; | |
716 | ||
717 | if (htab->loc_hash_table) | |
718 | htab_delete (htab->loc_hash_table); | |
719 | if (htab->loc_hash_memory) | |
720 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
721 | _bfd_elf_link_hash_table_free (obfd); | |
722 | } | |
723 | ||
5e2ac45d L |
724 | static bfd_boolean |
725 | elf_i386_is_reloc_section (const char *secname) | |
726 | { | |
727 | return CONST_STRNEQ (secname, ".rel"); | |
728 | } | |
729 | ||
730 | #ifdef BFD64 | |
731 | static bfd_boolean | |
732 | elf_x86_64_is_reloc_section (const char *secname) | |
733 | { | |
734 | return CONST_STRNEQ (secname, ".rela"); | |
735 | } | |
736 | #endif | |
737 | ||
765e526c L |
738 | /* Create an x86 ELF linker hash table. */ |
739 | ||
740 | struct bfd_link_hash_table * | |
741 | _bfd_x86_elf_link_hash_table_create (bfd *abfd) | |
742 | { | |
743 | struct elf_x86_link_hash_table *ret; | |
744 | const struct elf_backend_data *bed; | |
745 | bfd_size_type amt = sizeof (struct elf_x86_link_hash_table); | |
746 | ||
747 | ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt); | |
748 | if (ret == NULL) | |
749 | return NULL; | |
750 | ||
751 | bed = get_elf_backend_data (abfd); | |
752 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
753 | _bfd_x86_elf_link_hash_newfunc, | |
754 | sizeof (struct elf_x86_link_hash_entry), | |
755 | bed->target_id)) | |
756 | { | |
757 | free (ret); | |
758 | return NULL; | |
759 | } | |
760 | ||
761 | #ifdef BFD64 | |
5e2ac45d L |
762 | /* NB: If BFD64 isn't defined, only i386 will be supported. */ |
763 | if (bed->target_id == X86_64_ELF_DATA) | |
764 | { | |
765 | ret->convert_load = _bfd_x86_64_elf_convert_load; | |
766 | ret->is_reloc_section = elf_x86_64_is_reloc_section; | |
767 | ret->dt_reloc = DT_RELA; | |
768 | ret->dt_reloc_sz = DT_RELASZ; | |
769 | ret->dt_reloc_ent = DT_RELAENT; | |
770 | ret->got_entry_size = 8; | |
771 | } | |
765e526c L |
772 | if (ABI_64_P (abfd)) |
773 | { | |
774 | ret->r_info = elf64_r_info; | |
775 | ret->r_sym = elf64_r_sym; | |
503294e7 | 776 | ret->sizeof_reloc = sizeof (Elf64_External_Rela); |
765e526c L |
777 | ret->pointer_r_type = R_X86_64_64; |
778 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; | |
779 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; | |
780 | ret->tls_get_addr = "__tls_get_addr"; | |
781 | } | |
782 | else | |
783 | #endif | |
784 | { | |
785 | ret->r_info = elf32_r_info; | |
786 | ret->r_sym = elf32_r_sym; | |
5b86dbf4 | 787 | if (bed->target_id == X86_64_ELF_DATA) |
765e526c | 788 | { |
503294e7 | 789 | ret->sizeof_reloc = sizeof (Elf32_External_Rela); |
765e526c L |
790 | ret->pointer_r_type = R_X86_64_32; |
791 | ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER; | |
792 | ret->dynamic_interpreter_size | |
793 | = sizeof ELFX32_DYNAMIC_INTERPRETER; | |
794 | ret->tls_get_addr = "__tls_get_addr"; | |
795 | } | |
796 | else | |
797 | { | |
5e2ac45d L |
798 | ret->convert_load = _bfd_i386_elf_convert_load; |
799 | ret->is_reloc_section = elf_i386_is_reloc_section; | |
800 | ret->dt_reloc = DT_REL; | |
801 | ret->dt_reloc_sz = DT_RELSZ; | |
802 | ret->dt_reloc_ent = DT_RELENT; | |
503294e7 | 803 | ret->sizeof_reloc = sizeof (Elf32_External_Rel); |
9ff114ca | 804 | ret->got_entry_size = 4; |
765e526c L |
805 | ret->pointer_r_type = R_386_32; |
806 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; | |
807 | ret->dynamic_interpreter_size | |
808 | = sizeof ELF32_DYNAMIC_INTERPRETER; | |
809 | ret->tls_get_addr = "___tls_get_addr"; | |
810 | } | |
811 | } | |
fe53b4a4 | 812 | ret->target_id = bed->target_id; |
765e526c L |
813 | |
814 | ret->loc_hash_table = htab_try_create (1024, | |
815 | _bfd_x86_elf_local_htab_hash, | |
816 | _bfd_x86_elf_local_htab_eq, | |
817 | NULL); | |
818 | ret->loc_hash_memory = objalloc_create (); | |
819 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
820 | { | |
821 | elf_x86_link_hash_table_free (abfd); | |
822 | return NULL; | |
823 | } | |
824 | ret->elf.root.hash_table_free = elf_x86_link_hash_table_free; | |
825 | ||
826 | return &ret->elf.root; | |
827 | } | |
828 | ||
0afcef53 L |
829 | /* Sort relocs into address order. */ |
830 | ||
831 | int | |
832 | _bfd_x86_elf_compare_relocs (const void *ap, const void *bp) | |
833 | { | |
834 | const arelent *a = * (const arelent **) ap; | |
835 | const arelent *b = * (const arelent **) bp; | |
836 | ||
837 | if (a->address > b->address) | |
838 | return 1; | |
839 | else if (a->address < b->address) | |
840 | return -1; | |
841 | else | |
842 | return 0; | |
843 | } | |
844 | ||
845 | bfd_boolean | |
846 | _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info) | |
847 | { | |
848 | if (!bfd_link_relocatable (info)) | |
849 | { | |
850 | /* Check for __tls_get_addr reference. */ | |
851 | struct elf_x86_link_hash_table *htab; | |
852 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
853 | htab = elf_x86_hash_table (info, bed->target_id); | |
854 | if (htab) | |
855 | { | |
856 | struct elf_link_hash_entry *h | |
857 | = elf_link_hash_lookup (elf_hash_table (info), | |
858 | htab->tls_get_addr, | |
859 | FALSE, FALSE, FALSE); | |
860 | if (h != NULL) | |
861 | ((struct elf_x86_link_hash_entry *) h)->tls_get_addr = 1; | |
862 | } | |
863 | } | |
864 | ||
865 | /* Invoke the regular ELF backend linker to do all the work. */ | |
866 | return _bfd_elf_link_check_relocs (abfd, info); | |
867 | } | |
868 | ||
5e2ac45d L |
869 | /* Set the sizes of the dynamic sections. */ |
870 | ||
871 | bfd_boolean | |
872 | _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd, | |
873 | struct bfd_link_info *info) | |
874 | { | |
875 | struct elf_x86_link_hash_table *htab; | |
876 | bfd *dynobj; | |
877 | asection *s; | |
878 | bfd_boolean relocs; | |
879 | bfd *ibfd; | |
880 | const struct elf_backend_data *bed | |
881 | = get_elf_backend_data (output_bfd); | |
882 | ||
883 | htab = elf_x86_hash_table (info, bed->target_id); | |
884 | if (htab == NULL) | |
885 | return FALSE; | |
886 | dynobj = htab->elf.dynobj; | |
887 | if (dynobj == NULL) | |
888 | abort (); | |
889 | ||
890 | /* Set up .got offsets for local syms, and space for local dynamic | |
891 | relocs. */ | |
892 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
893 | { | |
894 | bfd_signed_vma *local_got; | |
895 | bfd_signed_vma *end_local_got; | |
896 | char *local_tls_type; | |
897 | bfd_vma *local_tlsdesc_gotent; | |
898 | bfd_size_type locsymcount; | |
899 | Elf_Internal_Shdr *symtab_hdr; | |
900 | asection *srel; | |
901 | ||
902 | if (! is_x86_elf (ibfd, htab)) | |
903 | continue; | |
904 | ||
905 | for (s = ibfd->sections; s != NULL; s = s->next) | |
906 | { | |
907 | struct elf_dyn_relocs *p; | |
908 | ||
909 | if (!htab->convert_load (ibfd, s, info)) | |
910 | return FALSE; | |
911 | ||
912 | for (p = ((struct elf_dyn_relocs *) | |
913 | elf_section_data (s)->local_dynrel); | |
914 | p != NULL; | |
915 | p = p->next) | |
916 | { | |
917 | if (!bfd_is_abs_section (p->sec) | |
918 | && bfd_is_abs_section (p->sec->output_section)) | |
919 | { | |
920 | /* Input section has been discarded, either because | |
921 | it is a copy of a linkonce section or due to | |
922 | linker script /DISCARD/, so we'll be discarding | |
923 | the relocs too. */ | |
924 | } | |
925 | else if (htab->is_vxworks | |
926 | && strcmp (p->sec->output_section->name, | |
927 | ".tls_vars") == 0) | |
928 | { | |
929 | /* Relocations in vxworks .tls_vars sections are | |
930 | handled specially by the loader. */ | |
931 | } | |
932 | else if (p->count != 0) | |
933 | { | |
934 | srel = elf_section_data (p->sec)->sreloc; | |
935 | srel->size += p->count * htab->sizeof_reloc; | |
936 | if ((p->sec->output_section->flags & SEC_READONLY) != 0 | |
937 | && (info->flags & DF_TEXTREL) == 0) | |
938 | { | |
939 | info->flags |= DF_TEXTREL; | |
940 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
941 | || info->error_textrel) | |
942 | /* xgettext:c-format */ | |
943 | info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"), | |
944 | p->sec->owner, p->sec); | |
945 | } | |
946 | } | |
947 | } | |
948 | } | |
949 | ||
950 | local_got = elf_local_got_refcounts (ibfd); | |
951 | if (!local_got) | |
952 | continue; | |
953 | ||
954 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
955 | locsymcount = symtab_hdr->sh_info; | |
956 | end_local_got = local_got + locsymcount; | |
957 | local_tls_type = elf_x86_local_got_tls_type (ibfd); | |
958 | local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd); | |
959 | s = htab->elf.sgot; | |
960 | srel = htab->elf.srelgot; | |
961 | for (; local_got < end_local_got; | |
962 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) | |
963 | { | |
964 | *local_tlsdesc_gotent = (bfd_vma) -1; | |
965 | if (*local_got > 0) | |
966 | { | |
967 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
968 | { | |
969 | *local_tlsdesc_gotent = htab->elf.sgotplt->size | |
970 | - elf_x86_compute_jump_table_size (htab); | |
971 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
972 | *local_got = (bfd_vma) -2; | |
973 | } | |
974 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
975 | || GOT_TLS_GD_P (*local_tls_type)) | |
976 | { | |
977 | *local_got = s->size; | |
978 | s->size += htab->got_entry_size; | |
979 | if (GOT_TLS_GD_P (*local_tls_type) | |
980 | || *local_tls_type == GOT_TLS_IE_BOTH) | |
981 | s->size += htab->got_entry_size; | |
982 | } | |
983 | if (bfd_link_pic (info) | |
984 | || GOT_TLS_GD_ANY_P (*local_tls_type) | |
985 | || (*local_tls_type & GOT_TLS_IE)) | |
986 | { | |
987 | if (*local_tls_type == GOT_TLS_IE_BOTH) | |
988 | srel->size += 2 * htab->sizeof_reloc; | |
989 | else if (GOT_TLS_GD_P (*local_tls_type) | |
990 | || ! GOT_TLS_GDESC_P (*local_tls_type)) | |
991 | srel->size += htab->sizeof_reloc; | |
992 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
993 | { | |
994 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
995 | if (bed->target_id == X86_64_ELF_DATA) | |
996 | htab->tlsdesc_plt = (bfd_vma) -1; | |
997 | } | |
998 | } | |
999 | } | |
1000 | else | |
1001 | *local_got = (bfd_vma) -1; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | if (htab->tls_ld_or_ldm_got.refcount > 0) | |
1006 | { | |
1007 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM | |
1008 | or R_X86_64_TLSLD relocs. */ | |
1009 | htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size; | |
1010 | htab->elf.sgot->size += 2 * htab->got_entry_size; | |
1011 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
1012 | } | |
1013 | else | |
1014 | htab->tls_ld_or_ldm_got.offset = -1; | |
1015 | ||
1016 | /* Allocate global sym .plt and .got entries, and space for global | |
1017 | sym dynamic relocs. */ | |
1018 | elf_link_hash_traverse (&htab->elf, elf_x86_allocate_dynrelocs, | |
1019 | info); | |
1020 | ||
1021 | /* Allocate .plt and .got entries, and space for local symbols. */ | |
1022 | htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc, | |
1023 | info); | |
1024 | ||
1025 | /* For every jump slot reserved in the sgotplt, reloc_count is | |
1026 | incremented. However, when we reserve space for TLS descriptors, | |
1027 | it's not incremented, so in order to compute the space reserved | |
1028 | for them, it suffices to multiply the reloc count by the jump | |
1029 | slot size. | |
1030 | ||
1031 | PR ld/13302: We start next_irelative_index at the end of .rela.plt | |
1032 | so that R_{386,X86_64}_IRELATIVE entries come last. */ | |
1033 | if (htab->elf.srelplt) | |
1034 | { | |
1035 | htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; | |
1036 | htab->sgotplt_jump_table_size | |
1037 | = elf_x86_compute_jump_table_size (htab); | |
1038 | htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; | |
1039 | } | |
1040 | else if (htab->elf.irelplt) | |
1041 | htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; | |
1042 | ||
1043 | if (htab->tlsdesc_plt) | |
1044 | { | |
1045 | /* NB: tlsdesc_plt is set only for x86-64. If we're not using | |
1046 | lazy TLS relocations, don't generate the PLT and GOT entries | |
1047 | they require. */ | |
1048 | if ((info->flags & DF_BIND_NOW)) | |
1049 | htab->tlsdesc_plt = 0; | |
1050 | else | |
1051 | { | |
1052 | htab->tlsdesc_got = htab->elf.sgot->size; | |
1053 | htab->elf.sgot->size += htab->got_entry_size; | |
1054 | /* Reserve room for the initial entry. | |
1055 | FIXME: we could probably do away with it in this case. */ | |
1056 | if (htab->elf.splt->size == 0) | |
1057 | htab->elf.splt->size = htab->plt.plt_entry_size; | |
1058 | htab->tlsdesc_plt = htab->elf.splt->size; | |
1059 | htab->elf.splt->size += htab->plt.plt_entry_size; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | if (htab->elf.sgotplt) | |
1064 | { | |
1065 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1066 | entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */ | |
1067 | if ((htab->elf.hgot == NULL | |
1068 | || !htab->elf.hgot->ref_regular_nonweak) | |
1069 | && (htab->elf.sgotplt->size == bed->got_header_size) | |
1070 | && (htab->elf.splt == NULL | |
1071 | || htab->elf.splt->size == 0) | |
1072 | && (htab->elf.sgot == NULL | |
1073 | || htab->elf.sgot->size == 0) | |
1074 | && (htab->elf.iplt == NULL | |
1075 | || htab->elf.iplt->size == 0) | |
1076 | && (htab->elf.igotplt == NULL | |
1077 | || htab->elf.igotplt->size == 0)) | |
1078 | htab->elf.sgotplt->size = 0; | |
1079 | } | |
1080 | ||
1081 | if (_bfd_elf_eh_frame_present (info)) | |
1082 | { | |
1083 | if (htab->plt_eh_frame != NULL | |
1084 | && htab->elf.splt != NULL | |
1085 | && htab->elf.splt->size != 0 | |
1086 | && !bfd_is_abs_section (htab->elf.splt->output_section)) | |
1087 | htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size; | |
1088 | ||
1089 | if (htab->plt_got_eh_frame != NULL | |
1090 | && htab->plt_got != NULL | |
1091 | && htab->plt_got->size != 0 | |
1092 | && !bfd_is_abs_section (htab->plt_got->output_section)) | |
1093 | htab->plt_got_eh_frame->size | |
1094 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1095 | ||
1096 | /* Unwind info for the second PLT and .plt.got sections are | |
1097 | identical. */ | |
1098 | if (htab->plt_second_eh_frame != NULL | |
1099 | && htab->plt_second != NULL | |
1100 | && htab->plt_second->size != 0 | |
1101 | && !bfd_is_abs_section (htab->plt_second->output_section)) | |
1102 | htab->plt_second_eh_frame->size | |
1103 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1104 | } | |
1105 | ||
1106 | /* We now have determined the sizes of the various dynamic sections. | |
1107 | Allocate memory for them. */ | |
1108 | relocs = FALSE; | |
1109 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1110 | { | |
1111 | bfd_boolean strip_section = TRUE; | |
1112 | ||
1113 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1114 | continue; | |
1115 | ||
1116 | if (s == htab->elf.splt | |
1117 | || s == htab->elf.sgot) | |
1118 | { | |
1119 | /* Strip this section if we don't need it; see the | |
1120 | comment below. */ | |
1121 | /* We'd like to strip these sections if they aren't needed, but if | |
1122 | we've exported dynamic symbols from them we must leave them. | |
1123 | It's too late to tell BFD to get rid of the symbols. */ | |
1124 | ||
1125 | if (htab->elf.hplt != NULL) | |
1126 | strip_section = FALSE; | |
1127 | } | |
1128 | else if (s == htab->elf.sgotplt | |
1129 | || s == htab->elf.iplt | |
1130 | || s == htab->elf.igotplt | |
1131 | || s == htab->plt_second | |
1132 | || s == htab->plt_got | |
1133 | || s == htab->plt_eh_frame | |
1134 | || s == htab->plt_got_eh_frame | |
1135 | || s == htab->plt_second_eh_frame | |
1136 | || s == htab->elf.sdynbss | |
1137 | || s == htab->elf.sdynrelro) | |
1138 | { | |
1139 | /* Strip these too. */ | |
1140 | } | |
1141 | else if (htab->is_reloc_section (bfd_get_section_name (dynobj, s))) | |
1142 | { | |
1143 | if (s->size != 0 | |
1144 | && s != htab->elf.srelplt | |
1145 | && s != htab->srelplt2) | |
1146 | relocs = TRUE; | |
1147 | ||
1148 | /* We use the reloc_count field as a counter if we need | |
1149 | to copy relocs into the output file. */ | |
1150 | if (s != htab->elf.srelplt) | |
1151 | s->reloc_count = 0; | |
1152 | } | |
1153 | else | |
1154 | { | |
1155 | /* It's not one of our sections, so don't allocate space. */ | |
1156 | continue; | |
1157 | } | |
1158 | ||
1159 | if (s->size == 0) | |
1160 | { | |
1161 | /* If we don't need this section, strip it from the | |
1162 | output file. This is mostly to handle .rel.bss and | |
1163 | .rel.plt. We must create both sections in | |
1164 | create_dynamic_sections, because they must be created | |
1165 | before the linker maps input sections to output | |
1166 | sections. The linker does that before | |
1167 | adjust_dynamic_symbol is called, and it is that | |
1168 | function which decides whether anything needs to go | |
1169 | into these sections. */ | |
1170 | if (strip_section) | |
1171 | s->flags |= SEC_EXCLUDE; | |
1172 | continue; | |
1173 | } | |
1174 | ||
1175 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1176 | continue; | |
1177 | ||
1178 | /* Allocate memory for the section contents. We use bfd_zalloc | |
1179 | here in case unused entries are not reclaimed before the | |
1180 | section's contents are written out. This should not happen, | |
1181 | but this way if it does, we get a R_386_NONE or R_X86_64_NONE | |
1182 | reloc instead of garbage. */ | |
1183 | s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); | |
1184 | if (s->contents == NULL) | |
1185 | return FALSE; | |
1186 | } | |
1187 | ||
1188 | if (htab->plt_eh_frame != NULL | |
1189 | && htab->plt_eh_frame->contents != NULL) | |
1190 | { | |
1191 | memcpy (htab->plt_eh_frame->contents, | |
1192 | htab->plt.eh_frame_plt, | |
1193 | htab->plt_eh_frame->size); | |
1194 | bfd_put_32 (dynobj, htab->elf.splt->size, | |
1195 | htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); | |
1196 | } | |
1197 | ||
1198 | if (htab->plt_got_eh_frame != NULL | |
1199 | && htab->plt_got_eh_frame->contents != NULL) | |
1200 | { | |
1201 | memcpy (htab->plt_got_eh_frame->contents, | |
1202 | htab->non_lazy_plt->eh_frame_plt, | |
1203 | htab->plt_got_eh_frame->size); | |
1204 | bfd_put_32 (dynobj, htab->plt_got->size, | |
1205 | (htab->plt_got_eh_frame->contents | |
1206 | + PLT_FDE_LEN_OFFSET)); | |
1207 | } | |
1208 | ||
1209 | if (htab->plt_second_eh_frame != NULL | |
1210 | && htab->plt_second_eh_frame->contents != NULL) | |
1211 | { | |
1212 | memcpy (htab->plt_second_eh_frame->contents, | |
1213 | htab->non_lazy_plt->eh_frame_plt, | |
1214 | htab->plt_second_eh_frame->size); | |
1215 | bfd_put_32 (dynobj, htab->plt_second->size, | |
1216 | (htab->plt_second_eh_frame->contents | |
1217 | + PLT_FDE_LEN_OFFSET)); | |
1218 | } | |
1219 | ||
1220 | if (htab->elf.dynamic_sections_created) | |
1221 | { | |
1222 | /* Add some entries to the .dynamic section. We fill in the | |
1223 | values later, in elf_{i386,x86_64}_finish_dynamic_sections, | |
1224 | but we must add the entries now so that we get the correct | |
1225 | size for the .dynamic section. The DT_DEBUG entry is filled | |
1226 | in by the dynamic linker and used by the debugger. */ | |
1227 | #define add_dynamic_entry(TAG, VAL) \ | |
1228 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
1229 | ||
1230 | if (bfd_link_executable (info)) | |
1231 | { | |
1232 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
1233 | return FALSE; | |
1234 | } | |
1235 | ||
1236 | if (htab->elf.splt->size != 0) | |
1237 | { | |
1238 | /* DT_PLTGOT is used by prelink even if there is no PLT | |
1239 | relocation. */ | |
1240 | if (!add_dynamic_entry (DT_PLTGOT, 0)) | |
1241 | return FALSE; | |
1242 | } | |
1243 | ||
1244 | if (htab->elf.srelplt->size != 0) | |
1245 | { | |
1246 | if (!add_dynamic_entry (DT_PLTRELSZ, 0) | |
1247 | || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc) | |
1248 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
1249 | return FALSE; | |
1250 | } | |
1251 | ||
1252 | if (htab->tlsdesc_plt | |
1253 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) | |
1254 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) | |
1255 | return FALSE; | |
1256 | ||
1257 | if (relocs) | |
1258 | { | |
1259 | if (!add_dynamic_entry (htab->dt_reloc, 0) | |
1260 | || !add_dynamic_entry (htab->dt_reloc_sz, 0) | |
1261 | || !add_dynamic_entry (htab->dt_reloc_ent, | |
1262 | htab->sizeof_reloc)) | |
1263 | return FALSE; | |
1264 | ||
1265 | /* If any dynamic relocs apply to a read-only section, | |
1266 | then we need a DT_TEXTREL entry. */ | |
1267 | if ((info->flags & DF_TEXTREL) == 0) | |
1268 | elf_link_hash_traverse (&htab->elf, | |
1269 | _bfd_x86_elf_readonly_dynrelocs, | |
1270 | info); | |
1271 | ||
1272 | if ((info->flags & DF_TEXTREL) != 0) | |
1273 | { | |
1274 | if (htab->readonly_dynrelocs_against_ifunc) | |
1275 | { | |
1276 | info->callbacks->einfo | |
1277 | (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n")); | |
1278 | bfd_set_error (bfd_error_bad_value); | |
1279 | return FALSE; | |
1280 | } | |
1281 | ||
1282 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1283 | return FALSE; | |
1284 | } | |
1285 | } | |
1286 | if (htab->is_vxworks | |
1287 | && !elf_vxworks_add_dynamic_entries (output_bfd, info)) | |
1288 | return FALSE; | |
1289 | } | |
1290 | #undef add_dynamic_entry | |
1291 | ||
1292 | return TRUE; | |
1293 | } | |
1294 | ||
0afcef53 L |
1295 | bfd_boolean |
1296 | _bfd_x86_elf_always_size_sections (bfd *output_bfd, | |
1297 | struct bfd_link_info *info) | |
1298 | { | |
1299 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
1300 | ||
1301 | if (tls_sec) | |
1302 | { | |
1303 | struct elf_link_hash_entry *tlsbase; | |
1304 | ||
1305 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
1306 | "_TLS_MODULE_BASE_", | |
1307 | FALSE, FALSE, FALSE); | |
1308 | ||
1309 | if (tlsbase && tlsbase->type == STT_TLS) | |
1310 | { | |
1311 | struct elf_x86_link_hash_table *htab; | |
1312 | struct bfd_link_hash_entry *bh = NULL; | |
1313 | const struct elf_backend_data *bed | |
1314 | = get_elf_backend_data (output_bfd); | |
1315 | ||
1316 | htab = elf_x86_hash_table (info, bed->target_id); | |
1317 | if (htab == NULL) | |
1318 | return FALSE; | |
1319 | ||
1320 | if (!(_bfd_generic_link_add_one_symbol | |
1321 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
1322 | tls_sec, 0, NULL, FALSE, | |
1323 | bed->collect, &bh))) | |
1324 | return FALSE; | |
1325 | ||
1326 | htab->tls_module_base = bh; | |
1327 | ||
1328 | tlsbase = (struct elf_link_hash_entry *)bh; | |
1329 | tlsbase->def_regular = 1; | |
1330 | tlsbase->other = STV_HIDDEN; | |
1331 | tlsbase->root.linker_def = 1; | |
1332 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | return TRUE; | |
1337 | } | |
1338 | ||
1339 | void | |
1340 | _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h, | |
1341 | const Elf_Internal_Sym *isym, | |
1342 | bfd_boolean definition, | |
1343 | bfd_boolean dynamic ATTRIBUTE_UNUSED) | |
1344 | { | |
1345 | if (definition) | |
1346 | { | |
1347 | struct elf_x86_link_hash_entry *eh | |
1348 | = (struct elf_x86_link_hash_entry *) h; | |
1349 | eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other) | |
1350 | == STV_PROTECTED); | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
1355 | ||
1356 | void | |
1357 | _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
1358 | struct elf_link_hash_entry *dir, | |
1359 | struct elf_link_hash_entry *ind) | |
1360 | { | |
1361 | struct elf_x86_link_hash_entry *edir, *eind; | |
1362 | ||
1363 | edir = (struct elf_x86_link_hash_entry *) dir; | |
1364 | eind = (struct elf_x86_link_hash_entry *) ind; | |
1365 | ||
1366 | if (eind->dyn_relocs != NULL) | |
1367 | { | |
1368 | if (edir->dyn_relocs != NULL) | |
1369 | { | |
1370 | struct elf_dyn_relocs **pp; | |
1371 | struct elf_dyn_relocs *p; | |
1372 | ||
1373 | /* Add reloc counts against the indirect sym to the direct sym | |
1374 | list. Merge any entries against the same section. */ | |
1375 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
1376 | { | |
1377 | struct elf_dyn_relocs *q; | |
1378 | ||
1379 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
1380 | if (q->sec == p->sec) | |
1381 | { | |
1382 | q->pc_count += p->pc_count; | |
1383 | q->count += p->count; | |
1384 | *pp = p->next; | |
1385 | break; | |
1386 | } | |
1387 | if (q == NULL) | |
1388 | pp = &p->next; | |
1389 | } | |
1390 | *pp = edir->dyn_relocs; | |
1391 | } | |
1392 | ||
1393 | edir->dyn_relocs = eind->dyn_relocs; | |
1394 | eind->dyn_relocs = NULL; | |
1395 | } | |
1396 | ||
1397 | if (ind->root.type == bfd_link_hash_indirect | |
1398 | && dir->got.refcount <= 0) | |
1399 | { | |
1400 | edir->tls_type = eind->tls_type; | |
1401 | eind->tls_type = GOT_UNKNOWN; | |
1402 | } | |
1403 | ||
1404 | /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will | |
1405 | generate a R_386_COPY reloc. */ | |
1406 | edir->gotoff_ref |= eind->gotoff_ref; | |
1407 | ||
1408 | edir->has_got_reloc |= eind->has_got_reloc; | |
1409 | edir->has_non_got_reloc |= eind->has_non_got_reloc; | |
1410 | ||
1411 | if (ELIMINATE_COPY_RELOCS | |
1412 | && ind->root.type != bfd_link_hash_indirect | |
1413 | && dir->dynamic_adjusted) | |
1414 | { | |
1415 | /* If called to transfer flags for a weakdef during processing | |
1416 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
1417 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
1418 | if (dir->versioned != versioned_hidden) | |
1419 | dir->ref_dynamic |= ind->ref_dynamic; | |
1420 | dir->ref_regular |= ind->ref_regular; | |
1421 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
1422 | dir->needs_plt |= ind->needs_plt; | |
1423 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
1424 | } | |
1425 | else | |
1426 | { | |
1427 | if (eind->func_pointer_refcount > 0) | |
1428 | { | |
1429 | edir->func_pointer_refcount += eind->func_pointer_refcount; | |
1430 | eind->func_pointer_refcount = 0; | |
1431 | } | |
1432 | ||
1433 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | /* Remove undefined weak symbol from the dynamic symbol table if it | |
1438 | is resolved to 0. */ | |
1439 | ||
1440 | bfd_boolean | |
1441 | _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info, | |
1442 | struct elf_link_hash_entry *h) | |
1443 | { | |
1444 | if (h->dynindx != -1) | |
1445 | { | |
1446 | const struct elf_backend_data *bed | |
1447 | = get_elf_backend_data (info->output_bfd); | |
1448 | if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, | |
1449 | bed->target_id, | |
1450 | elf_x86_hash_entry (h)->has_got_reloc, | |
1451 | elf_x86_hash_entry (h))) | |
1452 | { | |
1453 | h->dynindx = -1; | |
1454 | _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, | |
1455 | h->dynstr_index); | |
1456 | } | |
1457 | } | |
1458 | return TRUE; | |
1459 | } | |
1460 | ||
1461 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ | |
1462 | ||
1463 | bfd_boolean | |
1464 | _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h) | |
1465 | { | |
1466 | if (h->plt.offset != (bfd_vma) -1 | |
1467 | && !h->def_regular | |
1468 | && !h->pointer_equality_needed) | |
1469 | return FALSE; | |
1470 | ||
1471 | return _bfd_elf_hash_symbol (h); | |
1472 | } | |
1473 | ||
eeb2f20a L |
1474 | /* Adjust a symbol defined by a dynamic object and referenced by a |
1475 | regular object. The current definition is in some section of the | |
1476 | dynamic object, but we're not including those sections. We have to | |
1477 | change the definition to something the rest of the link can | |
1478 | understand. */ | |
1479 | ||
1480 | bfd_boolean | |
1481 | _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info, | |
1482 | struct elf_link_hash_entry *h) | |
1483 | { | |
1484 | struct elf_x86_link_hash_table *htab; | |
1485 | asection *s, *srel; | |
1486 | struct elf_x86_link_hash_entry *eh; | |
1487 | struct elf_dyn_relocs *p; | |
1488 | const struct elf_backend_data *bed | |
1489 | = get_elf_backend_data (info->output_bfd); | |
1490 | ||
1491 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
1492 | if (h->type == STT_GNU_IFUNC) | |
1493 | { | |
1494 | /* All local STT_GNU_IFUNC references must be treate as local | |
1495 | calls via local PLT. */ | |
1496 | if (h->ref_regular | |
1497 | && SYMBOL_CALLS_LOCAL (info, h)) | |
1498 | { | |
1499 | bfd_size_type pc_count = 0, count = 0; | |
1500 | struct elf_dyn_relocs **pp; | |
1501 | ||
1502 | eh = (struct elf_x86_link_hash_entry *) h; | |
1503 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1504 | { | |
1505 | pc_count += p->pc_count; | |
1506 | p->count -= p->pc_count; | |
1507 | p->pc_count = 0; | |
1508 | count += p->count; | |
1509 | if (p->count == 0) | |
1510 | *pp = p->next; | |
1511 | else | |
1512 | pp = &p->next; | |
1513 | } | |
1514 | ||
1515 | if (pc_count || count) | |
1516 | { | |
1517 | h->non_got_ref = 1; | |
1518 | if (pc_count) | |
1519 | { | |
1520 | /* Increment PLT reference count only for PC-relative | |
1521 | references. */ | |
1522 | h->needs_plt = 1; | |
1523 | if (h->plt.refcount <= 0) | |
1524 | h->plt.refcount = 1; | |
1525 | else | |
1526 | h->plt.refcount += 1; | |
1527 | } | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | if (h->plt.refcount <= 0) | |
1532 | { | |
1533 | h->plt.offset = (bfd_vma) -1; | |
1534 | h->needs_plt = 0; | |
1535 | } | |
1536 | return TRUE; | |
1537 | } | |
1538 | ||
1539 | /* If this is a function, put it in the procedure linkage table. We | |
1540 | will fill in the contents of the procedure linkage table later, | |
1541 | when we know the address of the .got section. */ | |
1542 | if (h->type == STT_FUNC | |
1543 | || h->needs_plt) | |
1544 | { | |
1545 | if (h->plt.refcount <= 0 | |
1546 | || SYMBOL_CALLS_LOCAL (info, h) | |
1547 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1548 | && h->root.type == bfd_link_hash_undefweak)) | |
1549 | { | |
1550 | /* This case can occur if we saw a PLT32 reloc in an input | |
1551 | file, but the symbol was never referred to by a dynamic | |
1552 | object, or if all references were garbage collected. In | |
1553 | such a case, we don't actually need to build a procedure | |
1554 | linkage table, and we can just do a PC32 reloc instead. */ | |
1555 | h->plt.offset = (bfd_vma) -1; | |
1556 | h->needs_plt = 0; | |
1557 | } | |
1558 | ||
1559 | return TRUE; | |
1560 | } | |
1561 | else | |
1562 | /* It's possible that we incorrectly decided a .plt reloc was needed | |
1563 | * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in | |
1564 | check_relocs. We can't decide accurately between function and | |
1565 | non-function syms in check-relocs; Objects loaded later in | |
1566 | the link may change h->type. So fix it now. */ | |
1567 | h->plt.offset = (bfd_vma) -1; | |
1568 | ||
1569 | eh = (struct elf_x86_link_hash_entry *) h; | |
1570 | ||
1571 | /* If this is a weak symbol, and there is a real definition, the | |
1572 | processor independent code will have arranged for us to see the | |
1573 | real definition first, and we can just use the same value. */ | |
1574 | if (h->u.weakdef != NULL) | |
1575 | { | |
1576 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined | |
1577 | || h->u.weakdef->root.type == bfd_link_hash_defweak); | |
1578 | h->root.u.def.section = h->u.weakdef->root.u.def.section; | |
1579 | h->root.u.def.value = h->u.weakdef->root.u.def.value; | |
1580 | if (ELIMINATE_COPY_RELOCS | |
1581 | || info->nocopyreloc | |
1582 | || SYMBOL_NO_COPYRELOC (info, eh)) | |
1583 | { | |
1584 | /* NB: needs_copy is always 0 for i386. */ | |
1585 | h->non_got_ref = h->u.weakdef->non_got_ref; | |
1586 | eh->needs_copy = h->u.weakdef->needs_copy; | |
1587 | } | |
1588 | return TRUE; | |
1589 | } | |
1590 | ||
1591 | /* This is a reference to a symbol defined by a dynamic object which | |
1592 | is not a function. */ | |
1593 | ||
1594 | /* If we are creating a shared library, we must presume that the | |
1595 | only references to the symbol are via the global offset table. | |
1596 | For such cases we need not do anything here; the relocations will | |
1597 | be handled correctly by relocate_section. */ | |
1598 | if (!bfd_link_executable (info)) | |
1599 | return TRUE; | |
1600 | ||
1601 | /* If there are no references to this symbol that do not use the | |
1602 | GOT nor R_386_GOTOFF relocation, we don't need to generate a copy | |
1603 | reloc. NB: gotoff_ref is always 0 for x86-64. */ | |
1604 | if (!h->non_got_ref && !eh->gotoff_ref) | |
1605 | return TRUE; | |
1606 | ||
1607 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1608 | if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh)) | |
1609 | { | |
1610 | h->non_got_ref = 0; | |
1611 | return TRUE; | |
1612 | } | |
1613 | ||
1614 | htab = elf_x86_hash_table (info, bed->target_id); | |
1615 | if (htab == NULL) | |
1616 | return FALSE; | |
1617 | ||
1618 | /* If there aren't any dynamic relocs in read-only sections nor | |
1619 | R_386_GOTOFF relocation, then we can keep the dynamic relocs and | |
1620 | avoid the copy reloc. This doesn't work on VxWorks, where we can | |
1621 | not have dynamic relocations (other than copy and jump slot | |
1622 | relocations) in an executable. */ | |
1623 | if (ELIMINATE_COPY_RELOCS | |
1624 | && (bed->target_id == X86_64_ELF_DATA | |
1625 | || (!eh->gotoff_ref | |
1626 | && !htab->is_vxworks))) | |
1627 | { | |
1628 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1629 | { | |
1630 | s = p->sec->output_section; | |
1631 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1632 | break; | |
1633 | } | |
1634 | ||
1635 | /* If we didn't find any dynamic relocs in read-only sections, | |
1636 | then we'll be keeping the dynamic relocs and avoiding the copy | |
1637 | reloc. */ | |
1638 | if (p == NULL) | |
1639 | { | |
1640 | h->non_got_ref = 0; | |
1641 | return TRUE; | |
1642 | } | |
1643 | } | |
1644 | ||
1645 | /* We must allocate the symbol in our .dynbss section, which will | |
1646 | become part of the .bss section of the executable. There will be | |
1647 | an entry for this symbol in the .dynsym section. The dynamic | |
1648 | object will contain position independent code, so all references | |
1649 | from the dynamic object to this symbol will go through the global | |
1650 | offset table. The dynamic linker will use the .dynsym entry to | |
1651 | determine the address it must put in the global offset table, so | |
1652 | both the dynamic object and the regular object will refer to the | |
1653 | same memory location for the variable. */ | |
1654 | ||
1655 | /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the | |
1656 | dynamic linker to copy the initial value out of the dynamic object | |
1657 | and into the runtime process image. */ | |
1658 | if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
1659 | { | |
1660 | s = htab->elf.sdynrelro; | |
1661 | srel = htab->elf.sreldynrelro; | |
1662 | } | |
1663 | else | |
1664 | { | |
1665 | s = htab->elf.sdynbss; | |
1666 | srel = htab->elf.srelbss; | |
1667 | } | |
1668 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) | |
1669 | { | |
503294e7 | 1670 | srel->size += htab->sizeof_reloc; |
eeb2f20a L |
1671 | h->needs_copy = 1; |
1672 | } | |
1673 | ||
1674 | return _bfd_elf_adjust_dynamic_copy (info, h, s); | |
1675 | } | |
1676 | ||
4f501a24 L |
1677 | /* Return the section that should be marked against GC for a given |
1678 | relocation. */ | |
1679 | ||
1680 | asection * | |
1681 | _bfd_x86_elf_gc_mark_hook (asection *sec, | |
1682 | struct bfd_link_info *info, | |
1683 | Elf_Internal_Rela *rel, | |
1684 | struct elf_link_hash_entry *h, | |
1685 | Elf_Internal_Sym *sym) | |
1686 | { | |
1687 | /* Compiler should optimize this out. */ | |
1688 | if (((unsigned int) R_X86_64_GNU_VTINHERIT | |
1689 | != (unsigned int) R_386_GNU_VTINHERIT) | |
1690 | || ((unsigned int) R_X86_64_GNU_VTENTRY | |
1691 | != (unsigned int) R_386_GNU_VTENTRY)) | |
1692 | abort (); | |
1693 | ||
1694 | if (h != NULL) | |
1695 | switch (ELF32_R_TYPE (rel->r_info)) | |
1696 | { | |
1697 | case R_X86_64_GNU_VTINHERIT: | |
1698 | case R_X86_64_GNU_VTENTRY: | |
1699 | return NULL; | |
1700 | } | |
1701 | ||
1702 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
1703 | } | |
1704 | ||
f493882d L |
1705 | static bfd_vma |
1706 | elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED, | |
1707 | bfd_vma off, | |
1708 | bfd_vma offset ATTRIBUTE_UNUSED, | |
1709 | bfd_vma got_addr) | |
1710 | { | |
1711 | return got_addr + off; | |
1712 | } | |
1713 | ||
1714 | static bfd_vma | |
1715 | elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p, | |
1716 | bfd_vma off, | |
1717 | bfd_vma offset, | |
1718 | bfd_vma got_addr ATTRIBUTE_UNUSED) | |
1719 | { | |
1720 | return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size; | |
1721 | } | |
1722 | ||
1723 | static bfd_boolean | |
1724 | elf_i386_valid_plt_reloc_p (unsigned int type) | |
1725 | { | |
1726 | return (type == R_386_JUMP_SLOT | |
1727 | || type == R_386_GLOB_DAT | |
1728 | || type == R_386_IRELATIVE); | |
1729 | } | |
1730 | ||
1731 | static bfd_boolean | |
1732 | elf_x86_64_valid_plt_reloc_p (unsigned int type) | |
1733 | { | |
1734 | return (type == R_X86_64_JUMP_SLOT | |
1735 | || type == R_X86_64_GLOB_DAT | |
1736 | || type == R_X86_64_IRELATIVE); | |
1737 | } | |
1738 | ||
1739 | long | |
1740 | _bfd_x86_elf_get_synthetic_symtab (bfd *abfd, | |
1741 | long count, | |
1742 | long relsize, | |
1743 | bfd_vma got_addr, | |
1744 | struct elf_x86_plt plts[], | |
1745 | asymbol **dynsyms, | |
1746 | asymbol **ret) | |
1747 | { | |
1748 | long size, i, n, len; | |
1749 | int j; | |
1750 | unsigned int plt_got_offset, plt_entry_size; | |
1751 | asymbol *s; | |
1752 | bfd_byte *plt_contents; | |
1753 | long dynrelcount; | |
1754 | arelent **dynrelbuf, *p; | |
1755 | char *names; | |
1756 | const struct elf_backend_data *bed; | |
1757 | bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma, | |
1758 | bfd_vma); | |
1759 | bfd_boolean (*valid_plt_reloc_p) (unsigned int); | |
1760 | ||
1761 | if (count == 0) | |
1762 | return -1; | |
1763 | ||
1764 | dynrelbuf = (arelent **) bfd_malloc (relsize); | |
1765 | if (dynrelbuf == NULL) | |
1766 | return -1; | |
1767 | ||
1768 | dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf, | |
1769 | dynsyms); | |
1770 | ||
1771 | /* Sort the relocs by address. */ | |
1772 | qsort (dynrelbuf, dynrelcount, sizeof (arelent *), | |
1773 | _bfd_x86_elf_compare_relocs); | |
1774 | ||
1775 | size = count * sizeof (asymbol); | |
1776 | ||
1777 | /* Allocate space for @plt suffixes. */ | |
1778 | n = 0; | |
1779 | for (i = 0; i < dynrelcount; i++) | |
1780 | { | |
1781 | p = dynrelbuf[i]; | |
1782 | size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); | |
1783 | if (p->addend != 0) | |
1784 | size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd); | |
1785 | } | |
1786 | ||
1787 | s = *ret = (asymbol *) bfd_zmalloc (size); | |
1788 | if (s == NULL) | |
1789 | goto bad_return; | |
1790 | ||
1791 | bed = get_elf_backend_data (abfd); | |
1792 | ||
1793 | if (bed->target_id == X86_64_ELF_DATA) | |
1794 | { | |
1795 | get_plt_got_vma = elf_x86_64_get_plt_got_vma; | |
1796 | valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p; | |
1797 | } | |
1798 | else | |
1799 | { | |
1800 | get_plt_got_vma = elf_i386_get_plt_got_vma; | |
1801 | valid_plt_reloc_p = elf_i386_valid_plt_reloc_p; | |
1802 | if (got_addr) | |
1803 | { | |
1804 | /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_ | |
1805 | address. */ | |
1806 | asection *sec = bfd_get_section_by_name (abfd, ".got.plt"); | |
1807 | if (sec != NULL) | |
1808 | got_addr = sec->vma; | |
1809 | else | |
1810 | { | |
1811 | sec = bfd_get_section_by_name (abfd, ".got"); | |
1812 | if (sec != NULL) | |
1813 | got_addr = sec->vma; | |
1814 | } | |
1815 | ||
1816 | if (got_addr == (bfd_vma) -1) | |
1817 | goto bad_return; | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | /* Check for each PLT section. */ | |
1822 | names = (char *) (s + count); | |
1823 | size = 0; | |
1824 | n = 0; | |
1825 | for (j = 0; plts[j].name != NULL; j++) | |
1826 | if ((plt_contents = plts[j].contents) != NULL) | |
1827 | { | |
1828 | long k; | |
1829 | bfd_vma offset; | |
1830 | asection *plt; | |
1831 | struct elf_x86_plt *plt_p = &plts[j]; | |
1832 | ||
1833 | plt_got_offset = plt_p->plt_got_offset; | |
1834 | plt_entry_size = plt_p->plt_entry_size; | |
1835 | ||
1836 | plt = plt_p->sec; | |
1837 | ||
1838 | if ((plt_p->type & plt_lazy)) | |
1839 | { | |
1840 | /* Skip PLT0 in lazy PLT. */ | |
1841 | k = 1; | |
1842 | offset = plt_entry_size; | |
1843 | } | |
1844 | else | |
1845 | { | |
1846 | k = 0; | |
1847 | offset = 0; | |
1848 | } | |
1849 | ||
1850 | /* Check each PLT entry against dynamic relocations. */ | |
1851 | for (; k < plt_p->count; k++) | |
1852 | { | |
1853 | int off; | |
1854 | bfd_vma got_vma; | |
1855 | long min, max, mid; | |
1856 | ||
1857 | /* Get the GOT offset for i386 or the PC-relative offset | |
1858 | for x86-64, a signed 32-bit integer. */ | |
1859 | off = H_GET_32 (abfd, (plt_contents + offset | |
1860 | + plt_got_offset)); | |
1861 | got_vma = get_plt_got_vma (plt_p, off, offset, got_addr); | |
1862 | ||
1863 | /* Binary search. */ | |
1864 | p = dynrelbuf[0]; | |
1865 | min = 0; | |
1866 | max = dynrelcount; | |
1867 | while ((min + 1) < max) | |
1868 | { | |
1869 | arelent *r; | |
1870 | ||
1871 | mid = (min + max) / 2; | |
1872 | r = dynrelbuf[mid]; | |
1873 | if (got_vma > r->address) | |
1874 | min = mid; | |
1875 | else if (got_vma < r->address) | |
1876 | max = mid; | |
1877 | else | |
1878 | { | |
1879 | p = r; | |
1880 | break; | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */ | |
1885 | if (got_vma == p->address | |
1886 | && p->howto != NULL | |
1887 | && valid_plt_reloc_p (p->howto->type)) | |
1888 | { | |
1889 | *s = **p->sym_ptr_ptr; | |
1890 | /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL | |
1891 | set. Since we are defining a symbol, ensure one | |
1892 | of them is set. */ | |
1893 | if ((s->flags & BSF_LOCAL) == 0) | |
1894 | s->flags |= BSF_GLOBAL; | |
1895 | s->flags |= BSF_SYNTHETIC; | |
1896 | /* This is no longer a section symbol. */ | |
1897 | s->flags &= ~BSF_SECTION_SYM; | |
1898 | s->section = plt; | |
1899 | s->the_bfd = plt->owner; | |
1900 | s->value = offset; | |
1901 | s->udata.p = NULL; | |
1902 | s->name = names; | |
1903 | len = strlen ((*p->sym_ptr_ptr)->name); | |
1904 | memcpy (names, (*p->sym_ptr_ptr)->name, len); | |
1905 | names += len; | |
1906 | if (p->addend != 0) | |
1907 | { | |
1908 | char buf[30], *a; | |
1909 | ||
1910 | memcpy (names, "+0x", sizeof ("+0x") - 1); | |
1911 | names += sizeof ("+0x") - 1; | |
1912 | bfd_sprintf_vma (abfd, buf, p->addend); | |
1913 | for (a = buf; *a == '0'; ++a) | |
1914 | ; | |
1915 | size = strlen (a); | |
1916 | memcpy (names, a, size); | |
1917 | names += size; | |
1918 | } | |
1919 | memcpy (names, "@plt", sizeof ("@plt")); | |
1920 | names += sizeof ("@plt"); | |
1921 | n++; | |
1922 | s++; | |
1923 | } | |
1924 | offset += plt_entry_size; | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | /* PLT entries with R_386_TLS_DESC relocations are skipped. */ | |
1929 | if (n == 0) | |
1930 | { | |
1931 | bad_return: | |
1932 | count = -1; | |
1933 | } | |
1934 | else | |
1935 | count = n; | |
1936 | ||
1937 | for (j = 0; plts[j].name != NULL; j++) | |
1938 | if (plts[j].contents != NULL) | |
1939 | free (plts[j].contents); | |
1940 | ||
1941 | free (dynrelbuf); | |
1942 | ||
1943 | return count; | |
1944 | } | |
1945 | ||
0afcef53 L |
1946 | /* Parse x86 GNU properties. */ |
1947 | ||
1948 | enum elf_property_kind | |
1949 | _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type, | |
1950 | bfd_byte *ptr, unsigned int datasz) | |
1951 | { | |
1952 | elf_property *prop; | |
1953 | ||
1954 | switch (type) | |
1955 | { | |
1956 | case GNU_PROPERTY_X86_ISA_1_USED: | |
1957 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
1958 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
1959 | if (datasz != 4) | |
1960 | { | |
1961 | _bfd_error_handler | |
1962 | ((type == GNU_PROPERTY_X86_ISA_1_USED | |
1963 | ? _("error: %B: <corrupt x86 ISA used size: 0x%x>") | |
1964 | : (type == GNU_PROPERTY_X86_ISA_1_NEEDED | |
1965 | ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>") | |
1966 | : _("error: %B: <corrupt x86 feature size: 0x%x>"))), | |
1967 | abfd, datasz); | |
1968 | return property_corrupt; | |
1969 | } | |
1970 | prop = _bfd_elf_get_property (abfd, type, datasz); | |
1971 | /* Combine properties of the same type. */ | |
1972 | prop->u.number |= bfd_h_get_32 (abfd, ptr); | |
1973 | prop->pr_kind = property_number; | |
1974 | break; | |
1975 | ||
1976 | default: | |
1977 | return property_ignored; | |
1978 | } | |
1979 | ||
1980 | return property_number; | |
1981 | } | |
1982 | ||
1983 | /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL, | |
1984 | return TRUE if APROP is updated. Otherwise, return TRUE if BPROP | |
1985 | should be merged with ABFD. */ | |
1986 | ||
1987 | bfd_boolean | |
1988 | _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info, | |
1989 | bfd *abfd ATTRIBUTE_UNUSED, | |
1990 | elf_property *aprop, | |
1991 | elf_property *bprop) | |
1992 | { | |
1993 | unsigned int number, features; | |
1994 | bfd_boolean updated = FALSE; | |
1995 | unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type; | |
1996 | ||
1997 | switch (pr_type) | |
1998 | { | |
1999 | case GNU_PROPERTY_X86_ISA_1_USED: | |
2000 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
2001 | if (aprop != NULL && bprop != NULL) | |
2002 | { | |
2003 | number = aprop->u.number; | |
2004 | aprop->u.number = number | bprop->u.number; | |
2005 | updated = number != (unsigned int) aprop->u.number; | |
2006 | } | |
2007 | else | |
2008 | { | |
2009 | /* Return TRUE if APROP is NULL to indicate that BPROP should | |
2010 | be added to ABFD. */ | |
2011 | updated = aprop == NULL; | |
2012 | } | |
2013 | break; | |
2014 | ||
2015 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
2016 | /* Only one of APROP and BPROP can be NULL: | |
2017 | 1. APROP & BPROP when both APROP and BPROP aren't NULL. | |
2018 | 2. If APROP is NULL, remove x86 feature. | |
2019 | 3. Otherwise, do nothing. | |
2020 | */ | |
2021 | if (aprop != NULL && bprop != NULL) | |
2022 | { | |
2023 | features = 0; | |
2024 | if (info->ibt) | |
2025 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2026 | if (info->shstk) | |
2027 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2028 | number = aprop->u.number; | |
2029 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2030 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2031 | aprop->u.number = (number & bprop->u.number) | features; | |
2032 | updated = number != (unsigned int) aprop->u.number; | |
2033 | /* Remove the property if all feature bits are cleared. */ | |
2034 | if (aprop->u.number == 0) | |
2035 | aprop->pr_kind = property_remove; | |
2036 | } | |
2037 | else | |
2038 | { | |
2039 | features = 0; | |
2040 | if (info->ibt) | |
2041 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2042 | if (info->shstk) | |
2043 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2044 | if (features) | |
2045 | { | |
2046 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2047 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2048 | if (aprop != NULL) | |
2049 | { | |
2050 | number = aprop->u.number; | |
2051 | aprop->u.number = number | features; | |
2052 | updated = number != (unsigned int) aprop->u.number; | |
2053 | } | |
2054 | else | |
2055 | { | |
2056 | bprop->u.number |= features; | |
2057 | updated = TRUE; | |
2058 | } | |
2059 | } | |
2060 | else if (aprop != NULL) | |
2061 | { | |
2062 | aprop->pr_kind = property_remove; | |
2063 | updated = TRUE; | |
2064 | } | |
2065 | } | |
2066 | break; | |
2067 | ||
2068 | default: | |
2069 | /* Never should happen. */ | |
2070 | abort (); | |
2071 | } | |
2072 | ||
2073 | return updated; | |
2074 | } | |
a6798bab L |
2075 | |
2076 | /* Set up x86 GNU properties. Return the first relocatable ELF input | |
2077 | with GNU properties if found. Otherwise, return NULL. */ | |
2078 | ||
2079 | bfd * | |
2080 | _bfd_x86_elf_link_setup_gnu_properties | |
2081 | (struct bfd_link_info *info, | |
2082 | struct elf_x86_plt_layout_table *plt_layout) | |
2083 | { | |
2084 | bfd_boolean normal_target; | |
2085 | bfd_boolean lazy_plt; | |
2086 | asection *sec, *pltsec; | |
2087 | bfd *dynobj; | |
2088 | bfd_boolean use_ibt_plt; | |
2089 | unsigned int plt_alignment, features; | |
2090 | struct elf_x86_link_hash_table *htab; | |
2091 | bfd *pbfd; | |
2092 | bfd *ebfd = NULL; | |
2093 | elf_property *prop; | |
2094 | const struct elf_backend_data *bed; | |
2095 | unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2; | |
2096 | unsigned int got_align; | |
2097 | ||
2098 | features = 0; | |
2099 | if (info->ibt) | |
2100 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2101 | if (info->shstk) | |
2102 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2103 | ||
2104 | /* Find a normal input file with GNU property note. */ | |
2105 | for (pbfd = info->input_bfds; | |
2106 | pbfd != NULL; | |
2107 | pbfd = pbfd->link.next) | |
2108 | if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour | |
2109 | && bfd_count_sections (pbfd) != 0) | |
2110 | { | |
2111 | ebfd = pbfd; | |
2112 | ||
2113 | if (elf_properties (pbfd) != NULL) | |
2114 | break; | |
2115 | } | |
2116 | ||
2117 | if (ebfd != NULL && features) | |
2118 | { | |
2119 | /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2120 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2121 | prop = _bfd_elf_get_property (ebfd, | |
2122 | GNU_PROPERTY_X86_FEATURE_1_AND, | |
2123 | 4); | |
2124 | prop->u.number |= features; | |
2125 | prop->pr_kind = property_number; | |
2126 | ||
2127 | /* Create the GNU property note section if needed. */ | |
2128 | if (pbfd == NULL) | |
2129 | { | |
2130 | sec = bfd_make_section_with_flags (ebfd, | |
2131 | NOTE_GNU_PROPERTY_SECTION_NAME, | |
2132 | (SEC_ALLOC | |
2133 | | SEC_LOAD | |
2134 | | SEC_IN_MEMORY | |
2135 | | SEC_READONLY | |
2136 | | SEC_HAS_CONTENTS | |
2137 | | SEC_DATA)); | |
2138 | if (sec == NULL) | |
2139 | info->callbacks->einfo (_("%F: failed to create GNU property section\n")); | |
2140 | ||
2141 | if (!bfd_set_section_alignment (ebfd, sec, class_align)) | |
2142 | { | |
2143 | error_alignment: | |
2144 | info->callbacks->einfo (_("%F%A: failed to align section\n"), | |
2145 | sec); | |
2146 | } | |
2147 | ||
2148 | elf_section_type (sec) = SHT_NOTE; | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | pbfd = _bfd_elf_link_setup_gnu_properties (info); | |
2153 | ||
2154 | if (bfd_link_relocatable (info)) | |
2155 | return pbfd; | |
2156 | ||
2157 | bed = get_elf_backend_data (info->output_bfd); | |
2158 | ||
2159 | htab = elf_x86_hash_table (info, bed->target_id); | |
2160 | if (htab == NULL) | |
2161 | return pbfd; | |
2162 | ||
eeb2f20a L |
2163 | htab->is_vxworks = plt_layout->is_vxworks; |
2164 | ||
a6798bab L |
2165 | use_ibt_plt = info->ibtplt || info->ibt; |
2166 | if (!use_ibt_plt && pbfd != NULL) | |
2167 | { | |
2168 | /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */ | |
2169 | elf_property_list *p; | |
2170 | ||
2171 | /* The property list is sorted in order of type. */ | |
2172 | for (p = elf_properties (pbfd); p; p = p->next) | |
2173 | { | |
2174 | if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type) | |
2175 | { | |
2176 | use_ibt_plt = !!(p->property.u.number | |
2177 | & GNU_PROPERTY_X86_FEATURE_1_IBT); | |
2178 | break; | |
2179 | } | |
2180 | else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type) | |
2181 | break; | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | dynobj = htab->elf.dynobj; | |
2186 | ||
2187 | /* Set htab->elf.dynobj here so that there is no need to check and | |
2188 | set it in check_relocs. */ | |
2189 | if (dynobj == NULL) | |
2190 | { | |
2191 | if (pbfd != NULL) | |
2192 | { | |
2193 | htab->elf.dynobj = pbfd; | |
2194 | dynobj = pbfd; | |
2195 | } | |
2196 | else | |
2197 | { | |
2198 | bfd *abfd; | |
2199 | ||
2200 | /* Find a normal input file to hold linker created | |
2201 | sections. */ | |
2202 | for (abfd = info->input_bfds; | |
2203 | abfd != NULL; | |
2204 | abfd = abfd->link.next) | |
2205 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour | |
2206 | && (abfd->flags | |
2207 | & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0) | |
2208 | { | |
2209 | htab->elf.dynobj = abfd; | |
2210 | dynobj = abfd; | |
2211 | break; | |
2212 | } | |
2213 | } | |
2214 | } | |
2215 | ||
2216 | /* Even when lazy binding is disabled by "-z now", the PLT0 entry may | |
2217 | still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for | |
2218 | canonical function address. */ | |
2219 | htab->plt.has_plt0 = 1; | |
2220 | normal_target = plt_layout->normal_target; | |
2221 | ||
2222 | if (normal_target) | |
2223 | { | |
2224 | if (use_ibt_plt) | |
2225 | { | |
2226 | htab->lazy_plt = plt_layout->lazy_ibt_plt; | |
2227 | htab->non_lazy_plt = plt_layout->non_lazy_ibt_plt; | |
2228 | } | |
2229 | else | |
2230 | { | |
2231 | htab->lazy_plt = plt_layout->lazy_plt; | |
2232 | htab->non_lazy_plt = plt_layout->non_lazy_plt; | |
2233 | } | |
2234 | } | |
2235 | else | |
2236 | { | |
2237 | htab->lazy_plt = plt_layout->lazy_plt; | |
2238 | htab->non_lazy_plt = NULL; | |
2239 | } | |
2240 | ||
2241 | pltsec = htab->elf.splt; | |
2242 | ||
2243 | /* If the non-lazy PLT is available, use it for all PLT entries if | |
2244 | there are no PLT0 or no .plt section. */ | |
2245 | if (htab->non_lazy_plt != NULL | |
2246 | && (!htab->plt.has_plt0 || pltsec == NULL)) | |
2247 | { | |
2248 | lazy_plt = FALSE; | |
2249 | if (bfd_link_pic (info)) | |
2250 | htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry; | |
2251 | else | |
2252 | htab->plt.plt_entry = htab->non_lazy_plt->plt_entry; | |
2253 | htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size; | |
2254 | htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset; | |
2255 | htab->plt.plt_got_insn_size | |
2256 | = htab->non_lazy_plt->plt_got_insn_size; | |
2257 | htab->plt.eh_frame_plt_size | |
2258 | = htab->non_lazy_plt->eh_frame_plt_size; | |
2259 | htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt; | |
2260 | } | |
2261 | else | |
2262 | { | |
2263 | lazy_plt = TRUE; | |
2264 | if (bfd_link_pic (info)) | |
2265 | { | |
2266 | htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry; | |
2267 | htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry; | |
2268 | } | |
2269 | else | |
2270 | { | |
2271 | htab->plt.plt0_entry = htab->lazy_plt->plt0_entry; | |
2272 | htab->plt.plt_entry = htab->lazy_plt->plt_entry; | |
2273 | } | |
2274 | htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size; | |
2275 | htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset; | |
2276 | htab->plt.plt_got_insn_size | |
2277 | = htab->lazy_plt->plt_got_insn_size; | |
2278 | htab->plt.eh_frame_plt_size | |
2279 | = htab->lazy_plt->eh_frame_plt_size; | |
2280 | htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt; | |
2281 | } | |
2282 | ||
2283 | /* Return if there are no normal input files. */ | |
2284 | if (dynobj == NULL) | |
2285 | return pbfd; | |
2286 | ||
eeb2f20a | 2287 | if (htab->is_vxworks |
a6798bab L |
2288 | && !elf_vxworks_create_dynamic_sections (dynobj, info, |
2289 | &htab->srelplt2)) | |
2290 | { | |
2291 | info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n")); | |
2292 | return pbfd; | |
2293 | } | |
2294 | ||
2295 | /* Since create_dynamic_sections isn't always called, but GOT | |
2296 | relocations need GOT relocations, create them here so that we | |
2297 | don't need to do it in check_relocs. */ | |
2298 | if (htab->elf.sgot == NULL | |
2299 | && !_bfd_elf_create_got_section (dynobj, info)) | |
2300 | info->callbacks->einfo (_("%F: failed to create GOT sections\n")); | |
2301 | ||
2302 | got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2; | |
2303 | ||
2304 | /* Align .got and .got.plt sections to their entry size. Do it here | |
2305 | instead of in create_dynamic_sections so that they are always | |
2306 | properly aligned even if create_dynamic_sections isn't called. */ | |
2307 | sec = htab->elf.sgot; | |
2308 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2309 | goto error_alignment; | |
2310 | ||
2311 | sec = htab->elf.sgotplt; | |
2312 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2313 | goto error_alignment; | |
2314 | ||
2315 | /* Create the ifunc sections here so that check_relocs can be | |
2316 | simplified. */ | |
2317 | if (!_bfd_elf_create_ifunc_sections (dynobj, info)) | |
2318 | info->callbacks->einfo (_("%F: failed to create ifunc sections\n")); | |
2319 | ||
2320 | plt_alignment = bfd_log2 (htab->plt.plt_entry_size); | |
2321 | ||
2322 | if (pltsec != NULL) | |
2323 | { | |
2324 | /* Whe creating executable, set the contents of the .interp | |
2325 | section to the interpreter. */ | |
2326 | if (bfd_link_executable (info) && !info->nointerp) | |
2327 | { | |
2328 | asection *s = bfd_get_linker_section (dynobj, ".interp"); | |
2329 | if (s == NULL) | |
2330 | abort (); | |
2331 | s->size = htab->dynamic_interpreter_size; | |
2332 | s->contents = (unsigned char *) htab->dynamic_interpreter; | |
2333 | htab->interp = s; | |
2334 | } | |
2335 | ||
2336 | /* Don't change PLT section alignment for NaCl since it uses | |
2337 | 64-byte PLT entry and sets PLT section alignment to 32 | |
2338 | bytes. Don't create additional PLT sections for NaCl. */ | |
2339 | if (normal_target) | |
2340 | { | |
2341 | flagword pltflags = (bed->dynamic_sec_flags | |
2342 | | SEC_ALLOC | |
2343 | | SEC_CODE | |
2344 | | SEC_LOAD | |
2345 | | SEC_READONLY); | |
2346 | unsigned int non_lazy_plt_alignment | |
2347 | = bfd_log2 (htab->non_lazy_plt->plt_entry_size); | |
2348 | ||
2349 | sec = pltsec; | |
2350 | if (!bfd_set_section_alignment (sec->owner, sec, | |
2351 | plt_alignment)) | |
2352 | goto error_alignment; | |
2353 | ||
2354 | /* Create the GOT procedure linkage table. */ | |
2355 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2356 | ".plt.got", | |
2357 | pltflags); | |
2358 | if (sec == NULL) | |
2359 | info->callbacks->einfo (_("%F: failed to create GOT PLT section\n")); | |
2360 | ||
2361 | if (!bfd_set_section_alignment (dynobj, sec, | |
2362 | non_lazy_plt_alignment)) | |
2363 | goto error_alignment; | |
2364 | ||
2365 | htab->plt_got = sec; | |
2366 | ||
2367 | if (lazy_plt) | |
2368 | { | |
2369 | sec = NULL; | |
2370 | ||
2371 | if (use_ibt_plt) | |
2372 | { | |
2373 | /* Create the second PLT for Intel IBT support. IBT | |
2374 | PLT is supported only for non-NaCl target and is | |
2375 | is needed only for lazy binding. */ | |
2376 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2377 | ".plt.sec", | |
2378 | pltflags); | |
2379 | if (sec == NULL) | |
2380 | info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n")); | |
2381 | ||
2382 | if (!bfd_set_section_alignment (dynobj, sec, | |
2383 | plt_alignment)) | |
2384 | goto error_alignment; | |
2385 | } | |
2386 | else if (info->bndplt && ABI_64_P (dynobj)) | |
2387 | { | |
2388 | /* Create the second PLT for Intel MPX support. MPX | |
2389 | PLT is supported only for non-NaCl target in 64-bit | |
2390 | mode and is needed only for lazy binding. */ | |
2391 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2392 | ".plt.sec", | |
2393 | pltflags); | |
2394 | if (sec == NULL) | |
2395 | info->callbacks->einfo (_("%F: failed to create BND PLT section\n")); | |
2396 | ||
2397 | if (!bfd_set_section_alignment (dynobj, sec, | |
2398 | non_lazy_plt_alignment)) | |
2399 | goto error_alignment; | |
2400 | } | |
2401 | ||
2402 | htab->plt_second = sec; | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | if (!info->no_ld_generated_unwind_info) | |
2407 | { | |
2408 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | |
2409 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
2410 | | SEC_LINKER_CREATED); | |
2411 | ||
2412 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2413 | ".eh_frame", | |
2414 | flags); | |
2415 | if (sec == NULL) | |
2416 | info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n")); | |
2417 | ||
2418 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2419 | goto error_alignment; | |
2420 | ||
2421 | htab->plt_eh_frame = sec; | |
2422 | ||
2423 | if (htab->plt_got != NULL) | |
2424 | { | |
2425 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2426 | ".eh_frame", | |
2427 | flags); | |
2428 | if (sec == NULL) | |
2429 | info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n")); | |
2430 | ||
2431 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2432 | goto error_alignment; | |
2433 | ||
2434 | htab->plt_got_eh_frame = sec; | |
2435 | } | |
2436 | ||
2437 | if (htab->plt_second != NULL) | |
2438 | { | |
2439 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2440 | ".eh_frame", | |
2441 | flags); | |
2442 | if (sec == NULL) | |
2443 | info->callbacks->einfo (_("%F: failed to create the second PLT .eh_frame section\n")); | |
2444 | ||
2445 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2446 | goto error_alignment; | |
2447 | ||
2448 | htab->plt_second_eh_frame = sec; | |
2449 | } | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | if (normal_target) | |
2454 | { | |
2455 | /* The .iplt section is used for IFUNC symbols in static | |
2456 | executables. */ | |
2457 | sec = htab->elf.iplt; | |
2458 | if (sec != NULL | |
2459 | && !bfd_set_section_alignment (sec->owner, sec, | |
2460 | plt_alignment)) | |
2461 | goto error_alignment; | |
2462 | } | |
2463 | ||
2464 | return pbfd; | |
2465 | } |