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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 | ||
c5bce5c6 | 110 | resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); |
b9ce864c L |
111 | |
112 | /* Clear the reference count of function pointer relocations if | |
113 | symbol isn't a normal function. */ | |
114 | if (h->type != STT_FUNC) | |
115 | eh->func_pointer_refcount = 0; | |
116 | ||
117 | /* We can't use the GOT PLT if pointer equality is needed since | |
118 | finish_dynamic_symbol won't clear symbol value and the dynamic | |
119 | linker won't update the GOT slot. We will get into an infinite | |
120 | loop at run-time. */ | |
121 | if (htab->plt_got != NULL | |
122 | && h->type != STT_GNU_IFUNC | |
123 | && !h->pointer_equality_needed | |
124 | && h->plt.refcount > 0 | |
125 | && h->got.refcount > 0) | |
126 | { | |
127 | /* Don't use the regular PLT if there are both GOT and GOTPLT | |
128 | reloctions. */ | |
129 | h->plt.offset = (bfd_vma) -1; | |
130 | ||
131 | /* Use the GOT PLT. */ | |
132 | eh->plt_got.refcount = 1; | |
133 | } | |
134 | ||
135 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it | |
136 | here if it is defined and referenced in a non-shared object. */ | |
137 | if (h->type == STT_GNU_IFUNC | |
138 | && h->def_regular) | |
139 | { | |
140 | if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, | |
141 | &htab->readonly_dynrelocs_against_ifunc, | |
142 | plt_entry_size, | |
143 | (htab->plt.has_plt0 | |
144 | * plt_entry_size), | |
145 | htab->got_entry_size, | |
146 | TRUE)) | |
147 | { | |
148 | asection *s = htab->plt_second; | |
149 | if (h->plt.offset != (bfd_vma) -1 && s != NULL) | |
150 | { | |
151 | /* Use the second PLT section if it is created. */ | |
152 | eh->plt_second.offset = s->size; | |
153 | ||
154 | /* Make room for this entry in the second PLT section. */ | |
155 | s->size += htab->non_lazy_plt->plt_entry_size; | |
156 | } | |
157 | ||
158 | return TRUE; | |
159 | } | |
160 | else | |
161 | return FALSE; | |
162 | } | |
163 | /* Don't create the PLT entry if there are only function pointer | |
164 | relocations which can be resolved at run-time. */ | |
165 | else if (htab->elf.dynamic_sections_created | |
166 | && (h->plt.refcount > eh->func_pointer_refcount | |
167 | || eh->plt_got.refcount > 0)) | |
168 | { | |
169 | bfd_boolean use_plt_got = eh->plt_got.refcount > 0; | |
170 | ||
171 | /* Clear the reference count of function pointer relocations | |
172 | if PLT is used. */ | |
173 | eh->func_pointer_refcount = 0; | |
174 | ||
175 | /* Make sure this symbol is output as a dynamic symbol. | |
176 | Undefined weak syms won't yet be marked as dynamic. */ | |
177 | if (h->dynindx == -1 | |
178 | && !h->forced_local | |
179 | && !resolved_to_zero | |
180 | && h->root.type == bfd_link_hash_undefweak) | |
181 | { | |
182 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
183 | return FALSE; | |
184 | } | |
185 | ||
186 | if (bfd_link_pic (info) | |
187 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) | |
188 | { | |
189 | asection *s = htab->elf.splt; | |
190 | asection *second_s = htab->plt_second; | |
191 | asection *got_s = htab->plt_got; | |
192 | ||
193 | /* If this is the first .plt entry, make room for the special | |
194 | first entry. The .plt section is used by prelink to undo | |
195 | prelinking for dynamic relocations. */ | |
196 | if (s->size == 0) | |
197 | s->size = htab->plt.has_plt0 * plt_entry_size; | |
198 | ||
199 | if (use_plt_got) | |
200 | eh->plt_got.offset = got_s->size; | |
201 | else | |
202 | { | |
203 | h->plt.offset = s->size; | |
204 | if (second_s) | |
205 | eh->plt_second.offset = second_s->size; | |
206 | } | |
207 | ||
208 | /* If this symbol is not defined in a regular file, and we are | |
209 | not generating a shared library, then set the symbol to this | |
210 | location in the .plt. This is required to make function | |
211 | pointers compare as equal between the normal executable and | |
212 | the shared library. */ | |
213 | if (! bfd_link_pic (info) | |
214 | && !h->def_regular) | |
215 | { | |
216 | if (use_plt_got) | |
217 | { | |
218 | /* We need to make a call to the entry of the GOT PLT | |
219 | instead of regular PLT entry. */ | |
220 | h->root.u.def.section = got_s; | |
221 | h->root.u.def.value = eh->plt_got.offset; | |
222 | } | |
223 | else | |
224 | { | |
225 | if (second_s) | |
226 | { | |
227 | /* We need to make a call to the entry of the | |
228 | second PLT instead of regular PLT entry. */ | |
229 | h->root.u.def.section = second_s; | |
230 | h->root.u.def.value = eh->plt_second.offset; | |
231 | } | |
232 | else | |
233 | { | |
234 | h->root.u.def.section = s; | |
235 | h->root.u.def.value = h->plt.offset; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | /* Make room for this entry. */ | |
241 | if (use_plt_got) | |
242 | got_s->size += htab->non_lazy_plt->plt_entry_size; | |
243 | else | |
244 | { | |
245 | s->size += plt_entry_size; | |
246 | if (second_s) | |
247 | second_s->size += htab->non_lazy_plt->plt_entry_size; | |
248 | ||
249 | /* We also need to make an entry in the .got.plt section, | |
250 | which will be placed in the .got section by the linker | |
251 | script. */ | |
252 | htab->elf.sgotplt->size += htab->got_entry_size; | |
253 | ||
254 | /* There should be no PLT relocation against resolved | |
255 | undefined weak symbol in executable. */ | |
256 | if (!resolved_to_zero) | |
257 | { | |
258 | /* We also need to make an entry in the .rel.plt | |
259 | section. */ | |
260 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
261 | htab->elf.srelplt->reloc_count++; | |
262 | } | |
263 | } | |
264 | ||
265 | if (htab->is_vxworks && !bfd_link_pic (info)) | |
266 | { | |
267 | /* VxWorks has a second set of relocations for each PLT entry | |
268 | in executables. They go in a separate relocation section, | |
269 | which is processed by the kernel loader. */ | |
270 | ||
271 | /* There are two relocations for the initial PLT entry: an | |
272 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an | |
273 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ | |
274 | ||
275 | asection *srelplt2 = htab->srelplt2; | |
276 | if (h->plt.offset == plt_entry_size) | |
277 | srelplt2->size += (htab->sizeof_reloc * 2); | |
278 | ||
279 | /* There are two extra relocations for each subsequent PLT entry: | |
280 | an R_386_32 relocation for the GOT entry, and an R_386_32 | |
281 | relocation for the PLT entry. */ | |
282 | ||
283 | srelplt2->size += (htab->sizeof_reloc * 2); | |
284 | } | |
285 | } | |
286 | else | |
287 | { | |
288 | eh->plt_got.offset = (bfd_vma) -1; | |
289 | h->plt.offset = (bfd_vma) -1; | |
290 | h->needs_plt = 0; | |
291 | } | |
292 | } | |
293 | else | |
294 | { | |
295 | eh->plt_got.offset = (bfd_vma) -1; | |
296 | h->plt.offset = (bfd_vma) -1; | |
297 | h->needs_plt = 0; | |
298 | } | |
299 | ||
300 | eh->tlsdesc_got = (bfd_vma) -1; | |
301 | ||
302 | /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the | |
303 | binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For | |
304 | x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary, | |
305 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ | |
306 | if (h->got.refcount > 0 | |
307 | && bfd_link_executable (info) | |
308 | && h->dynindx == -1 | |
309 | && (elf_x86_hash_entry (h)->tls_type & GOT_TLS_IE)) | |
310 | h->got.offset = (bfd_vma) -1; | |
311 | else if (h->got.refcount > 0) | |
312 | { | |
313 | asection *s; | |
314 | bfd_boolean dyn; | |
315 | int tls_type = elf_x86_hash_entry (h)->tls_type; | |
316 | ||
317 | /* Make sure this symbol is output as a dynamic symbol. | |
318 | Undefined weak syms won't yet be marked as dynamic. */ | |
319 | if (h->dynindx == -1 | |
320 | && !h->forced_local | |
321 | && !resolved_to_zero | |
322 | && h->root.type == bfd_link_hash_undefweak) | |
323 | { | |
324 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) | |
325 | return FALSE; | |
326 | } | |
327 | ||
328 | s = htab->elf.sgot; | |
329 | if (GOT_TLS_GDESC_P (tls_type)) | |
330 | { | |
331 | eh->tlsdesc_got = htab->elf.sgotplt->size | |
332 | - elf_x86_compute_jump_table_size (htab); | |
333 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
334 | h->got.offset = (bfd_vma) -2; | |
335 | } | |
336 | if (! GOT_TLS_GDESC_P (tls_type) | |
337 | || GOT_TLS_GD_P (tls_type)) | |
338 | { | |
339 | h->got.offset = s->size; | |
340 | s->size += htab->got_entry_size; | |
341 | /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT | |
342 | slots. */ | |
343 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) | |
344 | s->size += htab->got_entry_size; | |
345 | } | |
346 | dyn = htab->elf.dynamic_sections_created; | |
347 | /* R_386_TLS_IE_32 needs one dynamic relocation, | |
348 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, | |
349 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we | |
350 | need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local | |
351 | symbol and two if global. No dynamic relocation against | |
352 | resolved undefined weak symbol in executable. */ | |
353 | if (tls_type == GOT_TLS_IE_BOTH) | |
354 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
355 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) | |
356 | || (tls_type & GOT_TLS_IE)) | |
357 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
358 | else if (GOT_TLS_GD_P (tls_type)) | |
359 | htab->elf.srelgot->size += 2 * htab->sizeof_reloc; | |
360 | else if (! GOT_TLS_GDESC_P (tls_type) | |
361 | && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT | |
362 | && !resolved_to_zero) | |
363 | || h->root.type != bfd_link_hash_undefweak) | |
364 | && (bfd_link_pic (info) | |
365 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) | |
366 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
367 | if (GOT_TLS_GDESC_P (tls_type)) | |
0e30d991 L |
368 | { |
369 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
370 | if (bed->target_id == X86_64_ELF_DATA) | |
371 | htab->tlsdesc_plt = (bfd_vma) -1; | |
372 | } | |
b9ce864c L |
373 | } |
374 | else | |
375 | h->got.offset = (bfd_vma) -1; | |
376 | ||
377 | if (eh->dyn_relocs == NULL) | |
378 | return TRUE; | |
379 | ||
380 | /* In the shared -Bsymbolic case, discard space allocated for | |
381 | dynamic pc-relative relocs against symbols which turn out to be | |
382 | defined in regular objects. For the normal shared case, discard | |
383 | space for pc-relative relocs that have become local due to symbol | |
384 | visibility changes. */ | |
385 | ||
386 | if (bfd_link_pic (info)) | |
387 | { | |
388 | /* Relocs that use pc_count are those that appear on a call | |
389 | insn, or certain REL relocs that can generated via assembly. | |
390 | We want calls to protected symbols to resolve directly to the | |
391 | function rather than going via the plt. If people want | |
392 | function pointer comparisons to work as expected then they | |
393 | should avoid writing weird assembly. */ | |
394 | if (SYMBOL_CALLS_LOCAL (info, h)) | |
395 | { | |
396 | struct elf_dyn_relocs **pp; | |
397 | ||
398 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
399 | { | |
400 | p->count -= p->pc_count; | |
401 | p->pc_count = 0; | |
402 | if (p->count == 0) | |
403 | *pp = p->next; | |
404 | else | |
405 | pp = &p->next; | |
406 | } | |
407 | } | |
408 | ||
409 | if (htab->is_vxworks) | |
410 | { | |
411 | struct elf_dyn_relocs **pp; | |
412 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
413 | { | |
414 | if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) | |
415 | *pp = p->next; | |
416 | else | |
417 | pp = &p->next; | |
418 | } | |
419 | } | |
420 | ||
421 | /* Also discard relocs on undefined weak syms with non-default | |
422 | visibility or in PIE. */ | |
423 | if (eh->dyn_relocs != NULL) | |
424 | { | |
425 | if (h->root.type == bfd_link_hash_undefweak) | |
426 | { | |
427 | /* Undefined weak symbol is never bound locally in shared | |
428 | library. */ | |
429 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
430 | || resolved_to_zero) | |
431 | { | |
432 | if (bed->target_id == I386_ELF_DATA | |
433 | && h->non_got_ref) | |
434 | { | |
435 | /* Keep dynamic non-GOT/non-PLT relocation so | |
436 | that we can branch to 0 without PLT. */ | |
437 | struct elf_dyn_relocs **pp; | |
438 | ||
439 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
440 | if (p->pc_count == 0) | |
441 | *pp = p->next; | |
442 | else | |
443 | { | |
444 | /* Remove non-R_386_PC32 relocation. */ | |
445 | p->count = p->pc_count; | |
446 | pp = &p->next; | |
447 | } | |
448 | ||
449 | /* Make sure undefined weak symbols are output | |
450 | as dynamic symbols in PIEs for dynamic non-GOT | |
451 | non-PLT reloations. */ | |
452 | if (eh->dyn_relocs != NULL | |
453 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
454 | return FALSE; | |
455 | } | |
456 | else | |
457 | eh->dyn_relocs = NULL; | |
458 | } | |
459 | else if (h->dynindx == -1 | |
460 | && !h->forced_local | |
461 | && !bfd_elf_link_record_dynamic_symbol (info, h)) | |
462 | return FALSE; | |
463 | } | |
464 | else if (bfd_link_executable (info) | |
465 | && (h->needs_copy || eh->needs_copy) | |
466 | && h->def_dynamic | |
467 | && !h->def_regular) | |
468 | { | |
469 | /* NB: needs_copy is set only for x86-64. For PIE, | |
470 | discard space for pc-relative relocs against symbols | |
471 | which turn out to need copy relocs. */ | |
472 | struct elf_dyn_relocs **pp; | |
473 | ||
474 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
475 | { | |
476 | if (p->pc_count != 0) | |
477 | *pp = p->next; | |
478 | else | |
479 | pp = &p->next; | |
480 | } | |
481 | } | |
482 | } | |
483 | } | |
484 | else if (ELIMINATE_COPY_RELOCS) | |
485 | { | |
486 | /* For the non-shared case, discard space for relocs against | |
487 | symbols which turn out to need copy relocs or are not | |
488 | dynamic. Keep dynamic relocations for run-time function | |
489 | pointer initialization. */ | |
490 | ||
491 | if ((!h->non_got_ref | |
492 | || eh->func_pointer_refcount > 0 | |
493 | || (h->root.type == bfd_link_hash_undefweak | |
494 | && !resolved_to_zero)) | |
495 | && ((h->def_dynamic | |
496 | && !h->def_regular) | |
497 | || (htab->elf.dynamic_sections_created | |
498 | && (h->root.type == bfd_link_hash_undefweak | |
499 | || h->root.type == bfd_link_hash_undefined)))) | |
500 | { | |
501 | /* Make sure this symbol is output as a dynamic symbol. | |
502 | Undefined weak syms won't yet be marked as dynamic. */ | |
503 | if (h->dynindx == -1 | |
504 | && !h->forced_local | |
505 | && !resolved_to_zero | |
506 | && h->root.type == bfd_link_hash_undefweak | |
507 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) | |
508 | return FALSE; | |
509 | ||
510 | /* If that succeeded, we know we'll be keeping all the | |
511 | relocs. */ | |
512 | if (h->dynindx != -1) | |
513 | goto keep; | |
514 | } | |
515 | ||
516 | eh->dyn_relocs = NULL; | |
517 | eh->func_pointer_refcount = 0; | |
518 | ||
519 | keep: ; | |
520 | } | |
521 | ||
522 | /* Finally, allocate space. */ | |
523 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
524 | { | |
525 | asection *sreloc; | |
526 | ||
527 | sreloc = elf_section_data (p->sec)->sreloc; | |
528 | ||
529 | BFD_ASSERT (sreloc != NULL); | |
530 | sreloc->size += p->count * htab->sizeof_reloc; | |
531 | } | |
532 | ||
533 | return TRUE; | |
534 | } | |
535 | ||
0afcef53 L |
536 | /* Find any dynamic relocs that apply to read-only sections. */ |
537 | ||
538 | bfd_boolean | |
539 | _bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry *h, | |
540 | void *inf) | |
541 | { | |
542 | struct elf_x86_link_hash_entry *eh; | |
543 | struct elf_dyn_relocs *p; | |
544 | ||
545 | /* Skip local IFUNC symbols. */ | |
546 | if (h->forced_local && h->type == STT_GNU_IFUNC) | |
547 | return TRUE; | |
548 | ||
549 | eh = (struct elf_x86_link_hash_entry *) h; | |
550 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
551 | { | |
552 | asection *s = p->sec->output_section; | |
553 | ||
554 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
555 | { | |
556 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
557 | ||
558 | info->flags |= DF_TEXTREL; | |
559 | ||
560 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
561 | || info->error_textrel) | |
562 | /* xgettext:c-format */ | |
563 | info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"), | |
564 | p->sec->owner, h->root.root.string, | |
565 | p->sec); | |
566 | ||
567 | /* Not an error, just cut short the traversal. */ | |
568 | return FALSE; | |
569 | } | |
570 | } | |
571 | return TRUE; | |
572 | } | |
573 | ||
b9ce864c L |
574 | /* Allocate space in .plt, .got and associated reloc sections for |
575 | local dynamic relocs. */ | |
576 | ||
5e2ac45d L |
577 | static bfd_boolean |
578 | elf_x86_allocate_local_dynreloc (void **slot, void *inf) | |
b9ce864c L |
579 | { |
580 | struct elf_link_hash_entry *h | |
581 | = (struct elf_link_hash_entry *) *slot; | |
582 | ||
583 | if (h->type != STT_GNU_IFUNC | |
584 | || !h->def_regular | |
585 | || !h->ref_regular | |
586 | || !h->forced_local | |
587 | || h->root.type != bfd_link_hash_defined) | |
588 | abort (); | |
589 | ||
5e2ac45d | 590 | return elf_x86_allocate_dynrelocs (h, inf); |
b9ce864c L |
591 | } |
592 | ||
0afcef53 L |
593 | /* Find and/or create a hash entry for local symbol. */ |
594 | ||
595 | struct elf_link_hash_entry * | |
596 | _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab, | |
597 | bfd *abfd, const Elf_Internal_Rela *rel, | |
598 | bfd_boolean create) | |
599 | { | |
600 | struct elf_x86_link_hash_entry e, *ret; | |
601 | asection *sec = abfd->sections; | |
602 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
603 | htab->r_sym (rel->r_info)); | |
604 | void **slot; | |
605 | ||
606 | e.elf.indx = sec->id; | |
607 | e.elf.dynstr_index = htab->r_sym (rel->r_info); | |
608 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
609 | create ? INSERT : NO_INSERT); | |
610 | ||
611 | if (!slot) | |
612 | return NULL; | |
613 | ||
614 | if (*slot) | |
615 | { | |
616 | ret = (struct elf_x86_link_hash_entry *) *slot; | |
617 | return &ret->elf; | |
618 | } | |
619 | ||
620 | ret = (struct elf_x86_link_hash_entry *) | |
621 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
622 | sizeof (struct elf_x86_link_hash_entry)); | |
623 | if (ret) | |
624 | { | |
625 | memset (ret, 0, sizeof (*ret)); | |
626 | ret->elf.indx = sec->id; | |
627 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); | |
628 | ret->elf.dynindx = -1; | |
629 | ret->plt_got.offset = (bfd_vma) -1; | |
630 | *slot = ret; | |
631 | } | |
632 | return &ret->elf; | |
633 | } | |
634 | ||
635 | /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN | |
636 | SYNC WITH _bfd_elf_link_hash_newfunc. */ | |
637 | ||
638 | struct bfd_hash_entry * | |
639 | _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry, | |
640 | struct bfd_hash_table *table, | |
641 | const char *string) | |
642 | { | |
643 | /* Allocate the structure if it has not already been allocated by a | |
644 | subclass. */ | |
645 | if (entry == NULL) | |
646 | { | |
647 | entry = (struct bfd_hash_entry *) | |
648 | bfd_hash_allocate (table, | |
649 | sizeof (struct elf_x86_link_hash_entry)); | |
650 | if (entry == NULL) | |
651 | return entry; | |
652 | } | |
653 | ||
654 | /* Call the allocation method of the superclass. */ | |
655 | entry = _bfd_link_hash_newfunc (entry, table, string); | |
656 | if (entry != NULL) | |
657 | { | |
658 | struct elf_x86_link_hash_entry *eh | |
659 | = (struct elf_x86_link_hash_entry *) entry; | |
660 | struct elf_link_hash_table *htab | |
661 | = (struct elf_link_hash_table *) table; | |
662 | ||
663 | memset (&eh->elf.size, 0, | |
664 | (sizeof (struct elf_x86_link_hash_entry) | |
665 | - offsetof (struct elf_link_hash_entry, size))); | |
666 | /* Set local fields. */ | |
667 | eh->elf.indx = -1; | |
668 | eh->elf.dynindx = -1; | |
669 | eh->elf.got = htab->init_got_refcount; | |
670 | eh->elf.plt = htab->init_plt_refcount; | |
671 | /* Assume that we have been called by a non-ELF symbol reader. | |
672 | This flag is then reset by the code which reads an ELF input | |
673 | file. This ensures that a symbol created by a non-ELF symbol | |
674 | reader will have the flag set correctly. */ | |
675 | eh->elf.non_elf = 1; | |
676 | eh->plt_second.offset = (bfd_vma) -1; | |
677 | eh->plt_got.offset = (bfd_vma) -1; | |
678 | eh->tlsdesc_got = (bfd_vma) -1; | |
679 | } | |
680 | ||
681 | return entry; | |
682 | } | |
683 | ||
684 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
685 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
686 | as global symbol. We reuse indx and dynstr_index for local symbol | |
687 | hash since they aren't used by global symbols in this backend. */ | |
688 | ||
689 | hashval_t | |
690 | _bfd_x86_elf_local_htab_hash (const void *ptr) | |
691 | { | |
692 | struct elf_link_hash_entry *h | |
693 | = (struct elf_link_hash_entry *) ptr; | |
694 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
695 | } | |
696 | ||
697 | /* Compare local hash entries. */ | |
698 | ||
699 | int | |
700 | _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
701 | { | |
702 | struct elf_link_hash_entry *h1 | |
703 | = (struct elf_link_hash_entry *) ptr1; | |
704 | struct elf_link_hash_entry *h2 | |
705 | = (struct elf_link_hash_entry *) ptr2; | |
706 | ||
707 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
708 | } | |
709 | ||
710 | /* Destroy an x86 ELF linker hash table. */ | |
711 | ||
765e526c L |
712 | static void |
713 | elf_x86_link_hash_table_free (bfd *obfd) | |
0afcef53 L |
714 | { |
715 | struct elf_x86_link_hash_table *htab | |
716 | = (struct elf_x86_link_hash_table *) obfd->link.hash; | |
717 | ||
718 | if (htab->loc_hash_table) | |
719 | htab_delete (htab->loc_hash_table); | |
720 | if (htab->loc_hash_memory) | |
721 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
722 | _bfd_elf_link_hash_table_free (obfd); | |
723 | } | |
724 | ||
5e2ac45d L |
725 | static bfd_boolean |
726 | elf_i386_is_reloc_section (const char *secname) | |
727 | { | |
728 | return CONST_STRNEQ (secname, ".rel"); | |
729 | } | |
730 | ||
5e2ac45d L |
731 | static bfd_boolean |
732 | elf_x86_64_is_reloc_section (const char *secname) | |
733 | { | |
734 | return CONST_STRNEQ (secname, ".rela"); | |
735 | } | |
5e2ac45d | 736 | |
765e526c L |
737 | /* Create an x86 ELF linker hash table. */ |
738 | ||
739 | struct bfd_link_hash_table * | |
740 | _bfd_x86_elf_link_hash_table_create (bfd *abfd) | |
741 | { | |
742 | struct elf_x86_link_hash_table *ret; | |
743 | const struct elf_backend_data *bed; | |
744 | bfd_size_type amt = sizeof (struct elf_x86_link_hash_table); | |
745 | ||
746 | ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt); | |
747 | if (ret == NULL) | |
748 | return NULL; | |
749 | ||
750 | bed = get_elf_backend_data (abfd); | |
751 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
752 | _bfd_x86_elf_link_hash_newfunc, | |
753 | sizeof (struct elf_x86_link_hash_entry), | |
754 | bed->target_id)) | |
755 | { | |
756 | free (ret); | |
757 | return NULL; | |
758 | } | |
759 | ||
5e2ac45d L |
760 | if (bed->target_id == X86_64_ELF_DATA) |
761 | { | |
5e2ac45d L |
762 | ret->is_reloc_section = elf_x86_64_is_reloc_section; |
763 | ret->dt_reloc = DT_RELA; | |
764 | ret->dt_reloc_sz = DT_RELASZ; | |
765 | ret->dt_reloc_ent = DT_RELAENT; | |
766 | ret->got_entry_size = 8; | |
f04bdfa7 | 767 | ret->tls_get_addr = "__tls_get_addr"; |
5e2ac45d | 768 | } |
765e526c L |
769 | if (ABI_64_P (abfd)) |
770 | { | |
503294e7 | 771 | ret->sizeof_reloc = sizeof (Elf64_External_Rela); |
765e526c L |
772 | ret->pointer_r_type = R_X86_64_64; |
773 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; | |
774 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; | |
765e526c L |
775 | } |
776 | else | |
765e526c | 777 | { |
5b86dbf4 | 778 | if (bed->target_id == X86_64_ELF_DATA) |
765e526c | 779 | { |
503294e7 | 780 | ret->sizeof_reloc = sizeof (Elf32_External_Rela); |
765e526c L |
781 | ret->pointer_r_type = R_X86_64_32; |
782 | ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER; | |
783 | ret->dynamic_interpreter_size | |
784 | = sizeof ELFX32_DYNAMIC_INTERPRETER; | |
765e526c L |
785 | } |
786 | else | |
787 | { | |
5e2ac45d L |
788 | ret->is_reloc_section = elf_i386_is_reloc_section; |
789 | ret->dt_reloc = DT_REL; | |
790 | ret->dt_reloc_sz = DT_RELSZ; | |
791 | ret->dt_reloc_ent = DT_RELENT; | |
503294e7 | 792 | ret->sizeof_reloc = sizeof (Elf32_External_Rel); |
9ff114ca | 793 | ret->got_entry_size = 4; |
765e526c L |
794 | ret->pointer_r_type = R_386_32; |
795 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; | |
796 | ret->dynamic_interpreter_size | |
797 | = sizeof ELF32_DYNAMIC_INTERPRETER; | |
798 | ret->tls_get_addr = "___tls_get_addr"; | |
799 | } | |
800 | } | |
fe53b4a4 | 801 | ret->target_id = bed->target_id; |
765e526c L |
802 | |
803 | ret->loc_hash_table = htab_try_create (1024, | |
804 | _bfd_x86_elf_local_htab_hash, | |
805 | _bfd_x86_elf_local_htab_eq, | |
806 | NULL); | |
807 | ret->loc_hash_memory = objalloc_create (); | |
808 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
809 | { | |
810 | elf_x86_link_hash_table_free (abfd); | |
811 | return NULL; | |
812 | } | |
813 | ret->elf.root.hash_table_free = elf_x86_link_hash_table_free; | |
814 | ||
815 | return &ret->elf.root; | |
816 | } | |
817 | ||
0afcef53 L |
818 | /* Sort relocs into address order. */ |
819 | ||
820 | int | |
821 | _bfd_x86_elf_compare_relocs (const void *ap, const void *bp) | |
822 | { | |
823 | const arelent *a = * (const arelent **) ap; | |
824 | const arelent *b = * (const arelent **) bp; | |
825 | ||
826 | if (a->address > b->address) | |
827 | return 1; | |
828 | else if (a->address < b->address) | |
829 | return -1; | |
830 | else | |
831 | return 0; | |
832 | } | |
833 | ||
834 | bfd_boolean | |
835 | _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info) | |
836 | { | |
837 | if (!bfd_link_relocatable (info)) | |
838 | { | |
839 | /* Check for __tls_get_addr reference. */ | |
840 | struct elf_x86_link_hash_table *htab; | |
841 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
842 | htab = elf_x86_hash_table (info, bed->target_id); | |
843 | if (htab) | |
844 | { | |
0a27fed7 L |
845 | struct elf_link_hash_entry *h; |
846 | ||
847 | h = elf_link_hash_lookup (elf_hash_table (info), | |
0afcef53 L |
848 | htab->tls_get_addr, |
849 | FALSE, FALSE, FALSE); | |
850 | if (h != NULL) | |
0a27fed7 L |
851 | elf_x86_hash_entry (h)->tls_get_addr = 1; |
852 | ||
853 | /* "__ehdr_start" will be defined by linker as a hidden symbol | |
854 | later if it is referenced and not defined. */ | |
855 | h = elf_link_hash_lookup (elf_hash_table (info), | |
856 | "__ehdr_start", | |
857 | FALSE, FALSE, FALSE); | |
858 | if (h != NULL | |
859 | && (h->root.type == bfd_link_hash_new | |
860 | || h->root.type == bfd_link_hash_undefined | |
861 | || h->root.type == bfd_link_hash_undefweak | |
862 | || h->root.type == bfd_link_hash_common)) | |
863 | { | |
864 | elf_x86_hash_entry (h)->local_ref = 2; | |
865 | elf_x86_hash_entry (h)->linker_def = 1; | |
866 | } | |
0afcef53 L |
867 | } |
868 | } | |
869 | ||
870 | /* Invoke the regular ELF backend linker to do all the work. */ | |
871 | return _bfd_elf_link_check_relocs (abfd, info); | |
872 | } | |
873 | ||
5e2ac45d L |
874 | /* Set the sizes of the dynamic sections. */ |
875 | ||
876 | bfd_boolean | |
877 | _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd, | |
878 | struct bfd_link_info *info) | |
879 | { | |
880 | struct elf_x86_link_hash_table *htab; | |
881 | bfd *dynobj; | |
882 | asection *s; | |
883 | bfd_boolean relocs; | |
884 | bfd *ibfd; | |
885 | const struct elf_backend_data *bed | |
886 | = get_elf_backend_data (output_bfd); | |
887 | ||
888 | htab = elf_x86_hash_table (info, bed->target_id); | |
889 | if (htab == NULL) | |
890 | return FALSE; | |
891 | dynobj = htab->elf.dynobj; | |
892 | if (dynobj == NULL) | |
893 | abort (); | |
894 | ||
895 | /* Set up .got offsets for local syms, and space for local dynamic | |
896 | relocs. */ | |
897 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) | |
898 | { | |
899 | bfd_signed_vma *local_got; | |
900 | bfd_signed_vma *end_local_got; | |
901 | char *local_tls_type; | |
902 | bfd_vma *local_tlsdesc_gotent; | |
903 | bfd_size_type locsymcount; | |
904 | Elf_Internal_Shdr *symtab_hdr; | |
905 | asection *srel; | |
906 | ||
907 | if (! is_x86_elf (ibfd, htab)) | |
908 | continue; | |
909 | ||
910 | for (s = ibfd->sections; s != NULL; s = s->next) | |
911 | { | |
912 | struct elf_dyn_relocs *p; | |
913 | ||
5e2ac45d L |
914 | for (p = ((struct elf_dyn_relocs *) |
915 | elf_section_data (s)->local_dynrel); | |
916 | p != NULL; | |
917 | p = p->next) | |
918 | { | |
919 | if (!bfd_is_abs_section (p->sec) | |
920 | && bfd_is_abs_section (p->sec->output_section)) | |
921 | { | |
922 | /* Input section has been discarded, either because | |
923 | it is a copy of a linkonce section or due to | |
924 | linker script /DISCARD/, so we'll be discarding | |
925 | the relocs too. */ | |
926 | } | |
927 | else if (htab->is_vxworks | |
928 | && strcmp (p->sec->output_section->name, | |
929 | ".tls_vars") == 0) | |
930 | { | |
931 | /* Relocations in vxworks .tls_vars sections are | |
932 | handled specially by the loader. */ | |
933 | } | |
934 | else if (p->count != 0) | |
935 | { | |
936 | srel = elf_section_data (p->sec)->sreloc; | |
937 | srel->size += p->count * htab->sizeof_reloc; | |
938 | if ((p->sec->output_section->flags & SEC_READONLY) != 0 | |
939 | && (info->flags & DF_TEXTREL) == 0) | |
940 | { | |
941 | info->flags |= DF_TEXTREL; | |
942 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
943 | || info->error_textrel) | |
944 | /* xgettext:c-format */ | |
945 | info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"), | |
946 | p->sec->owner, p->sec); | |
947 | } | |
948 | } | |
949 | } | |
950 | } | |
951 | ||
952 | local_got = elf_local_got_refcounts (ibfd); | |
953 | if (!local_got) | |
954 | continue; | |
955 | ||
956 | symtab_hdr = &elf_symtab_hdr (ibfd); | |
957 | locsymcount = symtab_hdr->sh_info; | |
958 | end_local_got = local_got + locsymcount; | |
959 | local_tls_type = elf_x86_local_got_tls_type (ibfd); | |
960 | local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd); | |
961 | s = htab->elf.sgot; | |
962 | srel = htab->elf.srelgot; | |
963 | for (; local_got < end_local_got; | |
964 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) | |
965 | { | |
966 | *local_tlsdesc_gotent = (bfd_vma) -1; | |
967 | if (*local_got > 0) | |
968 | { | |
969 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
970 | { | |
971 | *local_tlsdesc_gotent = htab->elf.sgotplt->size | |
972 | - elf_x86_compute_jump_table_size (htab); | |
973 | htab->elf.sgotplt->size += 2 * htab->got_entry_size; | |
974 | *local_got = (bfd_vma) -2; | |
975 | } | |
976 | if (! GOT_TLS_GDESC_P (*local_tls_type) | |
977 | || GOT_TLS_GD_P (*local_tls_type)) | |
978 | { | |
979 | *local_got = s->size; | |
980 | s->size += htab->got_entry_size; | |
981 | if (GOT_TLS_GD_P (*local_tls_type) | |
982 | || *local_tls_type == GOT_TLS_IE_BOTH) | |
983 | s->size += htab->got_entry_size; | |
984 | } | |
985 | if (bfd_link_pic (info) | |
986 | || GOT_TLS_GD_ANY_P (*local_tls_type) | |
987 | || (*local_tls_type & GOT_TLS_IE)) | |
988 | { | |
989 | if (*local_tls_type == GOT_TLS_IE_BOTH) | |
990 | srel->size += 2 * htab->sizeof_reloc; | |
991 | else if (GOT_TLS_GD_P (*local_tls_type) | |
992 | || ! GOT_TLS_GDESC_P (*local_tls_type)) | |
993 | srel->size += htab->sizeof_reloc; | |
994 | if (GOT_TLS_GDESC_P (*local_tls_type)) | |
995 | { | |
996 | htab->elf.srelplt->size += htab->sizeof_reloc; | |
997 | if (bed->target_id == X86_64_ELF_DATA) | |
998 | htab->tlsdesc_plt = (bfd_vma) -1; | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | else | |
1003 | *local_got = (bfd_vma) -1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | if (htab->tls_ld_or_ldm_got.refcount > 0) | |
1008 | { | |
1009 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM | |
1010 | or R_X86_64_TLSLD relocs. */ | |
1011 | htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size; | |
1012 | htab->elf.sgot->size += 2 * htab->got_entry_size; | |
1013 | htab->elf.srelgot->size += htab->sizeof_reloc; | |
1014 | } | |
1015 | else | |
1016 | htab->tls_ld_or_ldm_got.offset = -1; | |
1017 | ||
1018 | /* Allocate global sym .plt and .got entries, and space for global | |
1019 | sym dynamic relocs. */ | |
1020 | elf_link_hash_traverse (&htab->elf, elf_x86_allocate_dynrelocs, | |
1021 | info); | |
1022 | ||
1023 | /* Allocate .plt and .got entries, and space for local symbols. */ | |
1024 | htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc, | |
1025 | info); | |
1026 | ||
1027 | /* For every jump slot reserved in the sgotplt, reloc_count is | |
1028 | incremented. However, when we reserve space for TLS descriptors, | |
1029 | it's not incremented, so in order to compute the space reserved | |
1030 | for them, it suffices to multiply the reloc count by the jump | |
1031 | slot size. | |
1032 | ||
1033 | PR ld/13302: We start next_irelative_index at the end of .rela.plt | |
1034 | so that R_{386,X86_64}_IRELATIVE entries come last. */ | |
1035 | if (htab->elf.srelplt) | |
1036 | { | |
1037 | htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; | |
1038 | htab->sgotplt_jump_table_size | |
1039 | = elf_x86_compute_jump_table_size (htab); | |
1040 | htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; | |
1041 | } | |
1042 | else if (htab->elf.irelplt) | |
1043 | htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; | |
1044 | ||
1045 | if (htab->tlsdesc_plt) | |
1046 | { | |
1047 | /* NB: tlsdesc_plt is set only for x86-64. If we're not using | |
1048 | lazy TLS relocations, don't generate the PLT and GOT entries | |
1049 | they require. */ | |
1050 | if ((info->flags & DF_BIND_NOW)) | |
1051 | htab->tlsdesc_plt = 0; | |
1052 | else | |
1053 | { | |
1054 | htab->tlsdesc_got = htab->elf.sgot->size; | |
1055 | htab->elf.sgot->size += htab->got_entry_size; | |
1056 | /* Reserve room for the initial entry. | |
1057 | FIXME: we could probably do away with it in this case. */ | |
1058 | if (htab->elf.splt->size == 0) | |
1059 | htab->elf.splt->size = htab->plt.plt_entry_size; | |
1060 | htab->tlsdesc_plt = htab->elf.splt->size; | |
1061 | htab->elf.splt->size += htab->plt.plt_entry_size; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | if (htab->elf.sgotplt) | |
1066 | { | |
1067 | /* Don't allocate .got.plt section if there are no GOT nor PLT | |
1068 | entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */ | |
1069 | if ((htab->elf.hgot == NULL | |
1070 | || !htab->elf.hgot->ref_regular_nonweak) | |
1071 | && (htab->elf.sgotplt->size == bed->got_header_size) | |
1072 | && (htab->elf.splt == NULL | |
1073 | || htab->elf.splt->size == 0) | |
1074 | && (htab->elf.sgot == NULL | |
1075 | || htab->elf.sgot->size == 0) | |
1076 | && (htab->elf.iplt == NULL | |
1077 | || htab->elf.iplt->size == 0) | |
1078 | && (htab->elf.igotplt == NULL | |
1079 | || htab->elf.igotplt->size == 0)) | |
1080 | htab->elf.sgotplt->size = 0; | |
1081 | } | |
1082 | ||
1083 | if (_bfd_elf_eh_frame_present (info)) | |
1084 | { | |
1085 | if (htab->plt_eh_frame != NULL | |
1086 | && htab->elf.splt != NULL | |
1087 | && htab->elf.splt->size != 0 | |
1088 | && !bfd_is_abs_section (htab->elf.splt->output_section)) | |
1089 | htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size; | |
1090 | ||
1091 | if (htab->plt_got_eh_frame != NULL | |
1092 | && htab->plt_got != NULL | |
1093 | && htab->plt_got->size != 0 | |
1094 | && !bfd_is_abs_section (htab->plt_got->output_section)) | |
1095 | htab->plt_got_eh_frame->size | |
1096 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1097 | ||
1098 | /* Unwind info for the second PLT and .plt.got sections are | |
1099 | identical. */ | |
1100 | if (htab->plt_second_eh_frame != NULL | |
1101 | && htab->plt_second != NULL | |
1102 | && htab->plt_second->size != 0 | |
1103 | && !bfd_is_abs_section (htab->plt_second->output_section)) | |
1104 | htab->plt_second_eh_frame->size | |
1105 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1106 | } | |
1107 | ||
1108 | /* We now have determined the sizes of the various dynamic sections. | |
1109 | Allocate memory for them. */ | |
1110 | relocs = FALSE; | |
1111 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1112 | { | |
1113 | bfd_boolean strip_section = TRUE; | |
1114 | ||
1115 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1116 | continue; | |
1117 | ||
1118 | if (s == htab->elf.splt | |
1119 | || s == htab->elf.sgot) | |
1120 | { | |
1121 | /* Strip this section if we don't need it; see the | |
1122 | comment below. */ | |
1123 | /* We'd like to strip these sections if they aren't needed, but if | |
1124 | we've exported dynamic symbols from them we must leave them. | |
1125 | It's too late to tell BFD to get rid of the symbols. */ | |
1126 | ||
1127 | if (htab->elf.hplt != NULL) | |
1128 | strip_section = FALSE; | |
1129 | } | |
1130 | else if (s == htab->elf.sgotplt | |
1131 | || s == htab->elf.iplt | |
1132 | || s == htab->elf.igotplt | |
1133 | || s == htab->plt_second | |
1134 | || s == htab->plt_got | |
1135 | || s == htab->plt_eh_frame | |
1136 | || s == htab->plt_got_eh_frame | |
1137 | || s == htab->plt_second_eh_frame | |
1138 | || s == htab->elf.sdynbss | |
1139 | || s == htab->elf.sdynrelro) | |
1140 | { | |
1141 | /* Strip these too. */ | |
1142 | } | |
1143 | else if (htab->is_reloc_section (bfd_get_section_name (dynobj, s))) | |
1144 | { | |
1145 | if (s->size != 0 | |
1146 | && s != htab->elf.srelplt | |
1147 | && s != htab->srelplt2) | |
1148 | relocs = TRUE; | |
1149 | ||
1150 | /* We use the reloc_count field as a counter if we need | |
1151 | to copy relocs into the output file. */ | |
1152 | if (s != htab->elf.srelplt) | |
1153 | s->reloc_count = 0; | |
1154 | } | |
1155 | else | |
1156 | { | |
1157 | /* It's not one of our sections, so don't allocate space. */ | |
1158 | continue; | |
1159 | } | |
1160 | ||
1161 | if (s->size == 0) | |
1162 | { | |
1163 | /* If we don't need this section, strip it from the | |
1164 | output file. This is mostly to handle .rel.bss and | |
1165 | .rel.plt. We must create both sections in | |
1166 | create_dynamic_sections, because they must be created | |
1167 | before the linker maps input sections to output | |
1168 | sections. The linker does that before | |
1169 | adjust_dynamic_symbol is called, and it is that | |
1170 | function which decides whether anything needs to go | |
1171 | into these sections. */ | |
1172 | if (strip_section) | |
1173 | s->flags |= SEC_EXCLUDE; | |
1174 | continue; | |
1175 | } | |
1176 | ||
1177 | if ((s->flags & SEC_HAS_CONTENTS) == 0) | |
1178 | continue; | |
1179 | ||
1180 | /* Allocate memory for the section contents. We use bfd_zalloc | |
1181 | here in case unused entries are not reclaimed before the | |
1182 | section's contents are written out. This should not happen, | |
1183 | but this way if it does, we get a R_386_NONE or R_X86_64_NONE | |
1184 | reloc instead of garbage. */ | |
1185 | s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); | |
1186 | if (s->contents == NULL) | |
1187 | return FALSE; | |
1188 | } | |
1189 | ||
1190 | if (htab->plt_eh_frame != NULL | |
1191 | && htab->plt_eh_frame->contents != NULL) | |
1192 | { | |
1193 | memcpy (htab->plt_eh_frame->contents, | |
1194 | htab->plt.eh_frame_plt, | |
1195 | htab->plt_eh_frame->size); | |
1196 | bfd_put_32 (dynobj, htab->elf.splt->size, | |
1197 | htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); | |
1198 | } | |
1199 | ||
1200 | if (htab->plt_got_eh_frame != NULL | |
1201 | && htab->plt_got_eh_frame->contents != NULL) | |
1202 | { | |
1203 | memcpy (htab->plt_got_eh_frame->contents, | |
1204 | htab->non_lazy_plt->eh_frame_plt, | |
1205 | htab->plt_got_eh_frame->size); | |
1206 | bfd_put_32 (dynobj, htab->plt_got->size, | |
1207 | (htab->plt_got_eh_frame->contents | |
1208 | + PLT_FDE_LEN_OFFSET)); | |
1209 | } | |
1210 | ||
1211 | if (htab->plt_second_eh_frame != NULL | |
1212 | && htab->plt_second_eh_frame->contents != NULL) | |
1213 | { | |
1214 | memcpy (htab->plt_second_eh_frame->contents, | |
1215 | htab->non_lazy_plt->eh_frame_plt, | |
1216 | htab->plt_second_eh_frame->size); | |
1217 | bfd_put_32 (dynobj, htab->plt_second->size, | |
1218 | (htab->plt_second_eh_frame->contents | |
1219 | + PLT_FDE_LEN_OFFSET)); | |
1220 | } | |
1221 | ||
1222 | if (htab->elf.dynamic_sections_created) | |
1223 | { | |
1224 | /* Add some entries to the .dynamic section. We fill in the | |
1225 | values later, in elf_{i386,x86_64}_finish_dynamic_sections, | |
1226 | but we must add the entries now so that we get the correct | |
1227 | size for the .dynamic section. The DT_DEBUG entry is filled | |
1228 | in by the dynamic linker and used by the debugger. */ | |
1229 | #define add_dynamic_entry(TAG, VAL) \ | |
1230 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) | |
1231 | ||
1232 | if (bfd_link_executable (info)) | |
1233 | { | |
1234 | if (!add_dynamic_entry (DT_DEBUG, 0)) | |
1235 | return FALSE; | |
1236 | } | |
1237 | ||
1238 | if (htab->elf.splt->size != 0) | |
1239 | { | |
1240 | /* DT_PLTGOT is used by prelink even if there is no PLT | |
1241 | relocation. */ | |
1242 | if (!add_dynamic_entry (DT_PLTGOT, 0)) | |
1243 | return FALSE; | |
1244 | } | |
1245 | ||
1246 | if (htab->elf.srelplt->size != 0) | |
1247 | { | |
1248 | if (!add_dynamic_entry (DT_PLTRELSZ, 0) | |
1249 | || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc) | |
1250 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
1251 | return FALSE; | |
1252 | } | |
1253 | ||
1254 | if (htab->tlsdesc_plt | |
1255 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) | |
1256 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) | |
1257 | return FALSE; | |
1258 | ||
1259 | if (relocs) | |
1260 | { | |
1261 | if (!add_dynamic_entry (htab->dt_reloc, 0) | |
1262 | || !add_dynamic_entry (htab->dt_reloc_sz, 0) | |
1263 | || !add_dynamic_entry (htab->dt_reloc_ent, | |
1264 | htab->sizeof_reloc)) | |
1265 | return FALSE; | |
1266 | ||
1267 | /* If any dynamic relocs apply to a read-only section, | |
1268 | then we need a DT_TEXTREL entry. */ | |
1269 | if ((info->flags & DF_TEXTREL) == 0) | |
1270 | elf_link_hash_traverse (&htab->elf, | |
1271 | _bfd_x86_elf_readonly_dynrelocs, | |
1272 | info); | |
1273 | ||
1274 | if ((info->flags & DF_TEXTREL) != 0) | |
1275 | { | |
1276 | if (htab->readonly_dynrelocs_against_ifunc) | |
1277 | { | |
1278 | info->callbacks->einfo | |
1279 | (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n")); | |
1280 | bfd_set_error (bfd_error_bad_value); | |
1281 | return FALSE; | |
1282 | } | |
1283 | ||
1284 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1285 | return FALSE; | |
1286 | } | |
1287 | } | |
1288 | if (htab->is_vxworks | |
1289 | && !elf_vxworks_add_dynamic_entries (output_bfd, info)) | |
1290 | return FALSE; | |
1291 | } | |
1292 | #undef add_dynamic_entry | |
1293 | ||
1294 | return TRUE; | |
1295 | } | |
1296 | ||
0afcef53 L |
1297 | bfd_boolean |
1298 | _bfd_x86_elf_always_size_sections (bfd *output_bfd, | |
1299 | struct bfd_link_info *info) | |
1300 | { | |
1301 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
1302 | ||
1303 | if (tls_sec) | |
1304 | { | |
1305 | struct elf_link_hash_entry *tlsbase; | |
1306 | ||
1307 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
1308 | "_TLS_MODULE_BASE_", | |
1309 | FALSE, FALSE, FALSE); | |
1310 | ||
1311 | if (tlsbase && tlsbase->type == STT_TLS) | |
1312 | { | |
1313 | struct elf_x86_link_hash_table *htab; | |
1314 | struct bfd_link_hash_entry *bh = NULL; | |
1315 | const struct elf_backend_data *bed | |
1316 | = get_elf_backend_data (output_bfd); | |
1317 | ||
1318 | htab = elf_x86_hash_table (info, bed->target_id); | |
1319 | if (htab == NULL) | |
1320 | return FALSE; | |
1321 | ||
1322 | if (!(_bfd_generic_link_add_one_symbol | |
1323 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
1324 | tls_sec, 0, NULL, FALSE, | |
1325 | bed->collect, &bh))) | |
1326 | return FALSE; | |
1327 | ||
1328 | htab->tls_module_base = bh; | |
1329 | ||
1330 | tlsbase = (struct elf_link_hash_entry *)bh; | |
1331 | tlsbase->def_regular = 1; | |
1332 | tlsbase->other = STV_HIDDEN; | |
1333 | tlsbase->root.linker_def = 1; | |
1334 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | return TRUE; | |
1339 | } | |
1340 | ||
1341 | void | |
1342 | _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h, | |
1343 | const Elf_Internal_Sym *isym, | |
1344 | bfd_boolean definition, | |
1345 | bfd_boolean dynamic ATTRIBUTE_UNUSED) | |
1346 | { | |
1347 | if (definition) | |
1348 | { | |
1349 | struct elf_x86_link_hash_entry *eh | |
1350 | = (struct elf_x86_link_hash_entry *) h; | |
1351 | eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other) | |
1352 | == STV_PROTECTED); | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
1357 | ||
1358 | void | |
1359 | _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
1360 | struct elf_link_hash_entry *dir, | |
1361 | struct elf_link_hash_entry *ind) | |
1362 | { | |
1363 | struct elf_x86_link_hash_entry *edir, *eind; | |
1364 | ||
1365 | edir = (struct elf_x86_link_hash_entry *) dir; | |
1366 | eind = (struct elf_x86_link_hash_entry *) ind; | |
1367 | ||
1368 | if (eind->dyn_relocs != NULL) | |
1369 | { | |
1370 | if (edir->dyn_relocs != NULL) | |
1371 | { | |
1372 | struct elf_dyn_relocs **pp; | |
1373 | struct elf_dyn_relocs *p; | |
1374 | ||
1375 | /* Add reloc counts against the indirect sym to the direct sym | |
1376 | list. Merge any entries against the same section. */ | |
1377 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
1378 | { | |
1379 | struct elf_dyn_relocs *q; | |
1380 | ||
1381 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
1382 | if (q->sec == p->sec) | |
1383 | { | |
1384 | q->pc_count += p->pc_count; | |
1385 | q->count += p->count; | |
1386 | *pp = p->next; | |
1387 | break; | |
1388 | } | |
1389 | if (q == NULL) | |
1390 | pp = &p->next; | |
1391 | } | |
1392 | *pp = edir->dyn_relocs; | |
1393 | } | |
1394 | ||
1395 | edir->dyn_relocs = eind->dyn_relocs; | |
1396 | eind->dyn_relocs = NULL; | |
1397 | } | |
1398 | ||
1399 | if (ind->root.type == bfd_link_hash_indirect | |
1400 | && dir->got.refcount <= 0) | |
1401 | { | |
1402 | edir->tls_type = eind->tls_type; | |
1403 | eind->tls_type = GOT_UNKNOWN; | |
1404 | } | |
1405 | ||
1406 | /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will | |
1407 | generate a R_386_COPY reloc. */ | |
1408 | edir->gotoff_ref |= eind->gotoff_ref; | |
1409 | ||
1410 | edir->has_got_reloc |= eind->has_got_reloc; | |
1411 | edir->has_non_got_reloc |= eind->has_non_got_reloc; | |
1412 | ||
1413 | if (ELIMINATE_COPY_RELOCS | |
1414 | && ind->root.type != bfd_link_hash_indirect | |
1415 | && dir->dynamic_adjusted) | |
1416 | { | |
1417 | /* If called to transfer flags for a weakdef during processing | |
1418 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
1419 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
1420 | if (dir->versioned != versioned_hidden) | |
1421 | dir->ref_dynamic |= ind->ref_dynamic; | |
1422 | dir->ref_regular |= ind->ref_regular; | |
1423 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
1424 | dir->needs_plt |= ind->needs_plt; | |
1425 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
1426 | } | |
1427 | else | |
1428 | { | |
1429 | if (eind->func_pointer_refcount > 0) | |
1430 | { | |
1431 | edir->func_pointer_refcount += eind->func_pointer_refcount; | |
1432 | eind->func_pointer_refcount = 0; | |
1433 | } | |
1434 | ||
1435 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | /* Remove undefined weak symbol from the dynamic symbol table if it | |
1440 | is resolved to 0. */ | |
1441 | ||
1442 | bfd_boolean | |
1443 | _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info, | |
1444 | struct elf_link_hash_entry *h) | |
1445 | { | |
c5bce5c6 L |
1446 | if (h->dynindx != -1 |
1447 | && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, elf_x86_hash_entry (h))) | |
0afcef53 | 1448 | { |
c5bce5c6 L |
1449 | h->dynindx = -1; |
1450 | _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, | |
1451 | h->dynstr_index); | |
0afcef53 L |
1452 | } |
1453 | return TRUE; | |
1454 | } | |
1455 | ||
1456 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ | |
1457 | ||
1458 | bfd_boolean | |
1459 | _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h) | |
1460 | { | |
1461 | if (h->plt.offset != (bfd_vma) -1 | |
1462 | && !h->def_regular | |
1463 | && !h->pointer_equality_needed) | |
1464 | return FALSE; | |
1465 | ||
1466 | return _bfd_elf_hash_symbol (h); | |
1467 | } | |
1468 | ||
eeb2f20a L |
1469 | /* Adjust a symbol defined by a dynamic object and referenced by a |
1470 | regular object. The current definition is in some section of the | |
1471 | dynamic object, but we're not including those sections. We have to | |
1472 | change the definition to something the rest of the link can | |
1473 | understand. */ | |
1474 | ||
1475 | bfd_boolean | |
1476 | _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info, | |
1477 | struct elf_link_hash_entry *h) | |
1478 | { | |
1479 | struct elf_x86_link_hash_table *htab; | |
1480 | asection *s, *srel; | |
1481 | struct elf_x86_link_hash_entry *eh; | |
1482 | struct elf_dyn_relocs *p; | |
1483 | const struct elf_backend_data *bed | |
1484 | = get_elf_backend_data (info->output_bfd); | |
1485 | ||
1486 | /* STT_GNU_IFUNC symbol must go through PLT. */ | |
1487 | if (h->type == STT_GNU_IFUNC) | |
1488 | { | |
1489 | /* All local STT_GNU_IFUNC references must be treate as local | |
1490 | calls via local PLT. */ | |
1491 | if (h->ref_regular | |
1492 | && SYMBOL_CALLS_LOCAL (info, h)) | |
1493 | { | |
1494 | bfd_size_type pc_count = 0, count = 0; | |
1495 | struct elf_dyn_relocs **pp; | |
1496 | ||
1497 | eh = (struct elf_x86_link_hash_entry *) h; | |
1498 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1499 | { | |
1500 | pc_count += p->pc_count; | |
1501 | p->count -= p->pc_count; | |
1502 | p->pc_count = 0; | |
1503 | count += p->count; | |
1504 | if (p->count == 0) | |
1505 | *pp = p->next; | |
1506 | else | |
1507 | pp = &p->next; | |
1508 | } | |
1509 | ||
1510 | if (pc_count || count) | |
1511 | { | |
1512 | h->non_got_ref = 1; | |
1513 | if (pc_count) | |
1514 | { | |
1515 | /* Increment PLT reference count only for PC-relative | |
1516 | references. */ | |
1517 | h->needs_plt = 1; | |
1518 | if (h->plt.refcount <= 0) | |
1519 | h->plt.refcount = 1; | |
1520 | else | |
1521 | h->plt.refcount += 1; | |
1522 | } | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | if (h->plt.refcount <= 0) | |
1527 | { | |
1528 | h->plt.offset = (bfd_vma) -1; | |
1529 | h->needs_plt = 0; | |
1530 | } | |
1531 | return TRUE; | |
1532 | } | |
1533 | ||
1534 | /* If this is a function, put it in the procedure linkage table. We | |
1535 | will fill in the contents of the procedure linkage table later, | |
1536 | when we know the address of the .got section. */ | |
1537 | if (h->type == STT_FUNC | |
1538 | || h->needs_plt) | |
1539 | { | |
1540 | if (h->plt.refcount <= 0 | |
1541 | || SYMBOL_CALLS_LOCAL (info, h) | |
1542 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1543 | && h->root.type == bfd_link_hash_undefweak)) | |
1544 | { | |
1545 | /* This case can occur if we saw a PLT32 reloc in an input | |
1546 | file, but the symbol was never referred to by a dynamic | |
1547 | object, or if all references were garbage collected. In | |
1548 | such a case, we don't actually need to build a procedure | |
1549 | linkage table, and we can just do a PC32 reloc instead. */ | |
1550 | h->plt.offset = (bfd_vma) -1; | |
1551 | h->needs_plt = 0; | |
1552 | } | |
1553 | ||
1554 | return TRUE; | |
1555 | } | |
1556 | else | |
1557 | /* It's possible that we incorrectly decided a .plt reloc was needed | |
1558 | * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in | |
1559 | check_relocs. We can't decide accurately between function and | |
1560 | non-function syms in check-relocs; Objects loaded later in | |
1561 | the link may change h->type. So fix it now. */ | |
1562 | h->plt.offset = (bfd_vma) -1; | |
1563 | ||
1564 | eh = (struct elf_x86_link_hash_entry *) h; | |
1565 | ||
1566 | /* If this is a weak symbol, and there is a real definition, the | |
1567 | processor independent code will have arranged for us to see the | |
1568 | real definition first, and we can just use the same value. */ | |
1569 | if (h->u.weakdef != NULL) | |
1570 | { | |
1571 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined | |
1572 | || h->u.weakdef->root.type == bfd_link_hash_defweak); | |
1573 | h->root.u.def.section = h->u.weakdef->root.u.def.section; | |
1574 | h->root.u.def.value = h->u.weakdef->root.u.def.value; | |
1575 | if (ELIMINATE_COPY_RELOCS | |
1576 | || info->nocopyreloc | |
1577 | || SYMBOL_NO_COPYRELOC (info, eh)) | |
1578 | { | |
1579 | /* NB: needs_copy is always 0 for i386. */ | |
1580 | h->non_got_ref = h->u.weakdef->non_got_ref; | |
1581 | eh->needs_copy = h->u.weakdef->needs_copy; | |
1582 | } | |
1583 | return TRUE; | |
1584 | } | |
1585 | ||
1586 | /* This is a reference to a symbol defined by a dynamic object which | |
1587 | is not a function. */ | |
1588 | ||
1589 | /* If we are creating a shared library, we must presume that the | |
1590 | only references to the symbol are via the global offset table. | |
1591 | For such cases we need not do anything here; the relocations will | |
1592 | be handled correctly by relocate_section. */ | |
1593 | if (!bfd_link_executable (info)) | |
1594 | return TRUE; | |
1595 | ||
1596 | /* If there are no references to this symbol that do not use the | |
1597 | GOT nor R_386_GOTOFF relocation, we don't need to generate a copy | |
1598 | reloc. NB: gotoff_ref is always 0 for x86-64. */ | |
1599 | if (!h->non_got_ref && !eh->gotoff_ref) | |
1600 | return TRUE; | |
1601 | ||
1602 | /* If -z nocopyreloc was given, we won't generate them either. */ | |
1603 | if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh)) | |
1604 | { | |
1605 | h->non_got_ref = 0; | |
1606 | return TRUE; | |
1607 | } | |
1608 | ||
1609 | htab = elf_x86_hash_table (info, bed->target_id); | |
1610 | if (htab == NULL) | |
1611 | return FALSE; | |
1612 | ||
1613 | /* If there aren't any dynamic relocs in read-only sections nor | |
1614 | R_386_GOTOFF relocation, then we can keep the dynamic relocs and | |
1615 | avoid the copy reloc. This doesn't work on VxWorks, where we can | |
1616 | not have dynamic relocations (other than copy and jump slot | |
1617 | relocations) in an executable. */ | |
1618 | if (ELIMINATE_COPY_RELOCS | |
1619 | && (bed->target_id == X86_64_ELF_DATA | |
1620 | || (!eh->gotoff_ref | |
1621 | && !htab->is_vxworks))) | |
1622 | { | |
1623 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1624 | { | |
1625 | s = p->sec->output_section; | |
1626 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1627 | break; | |
1628 | } | |
1629 | ||
1630 | /* If we didn't find any dynamic relocs in read-only sections, | |
1631 | then we'll be keeping the dynamic relocs and avoiding the copy | |
1632 | reloc. */ | |
1633 | if (p == NULL) | |
1634 | { | |
1635 | h->non_got_ref = 0; | |
1636 | return TRUE; | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | /* We must allocate the symbol in our .dynbss section, which will | |
1641 | become part of the .bss section of the executable. There will be | |
1642 | an entry for this symbol in the .dynsym section. The dynamic | |
1643 | object will contain position independent code, so all references | |
1644 | from the dynamic object to this symbol will go through the global | |
1645 | offset table. The dynamic linker will use the .dynsym entry to | |
1646 | determine the address it must put in the global offset table, so | |
1647 | both the dynamic object and the regular object will refer to the | |
1648 | same memory location for the variable. */ | |
1649 | ||
1650 | /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the | |
1651 | dynamic linker to copy the initial value out of the dynamic object | |
1652 | and into the runtime process image. */ | |
1653 | if ((h->root.u.def.section->flags & SEC_READONLY) != 0) | |
1654 | { | |
1655 | s = htab->elf.sdynrelro; | |
1656 | srel = htab->elf.sreldynrelro; | |
1657 | } | |
1658 | else | |
1659 | { | |
1660 | s = htab->elf.sdynbss; | |
1661 | srel = htab->elf.srelbss; | |
1662 | } | |
1663 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) | |
1664 | { | |
503294e7 | 1665 | srel->size += htab->sizeof_reloc; |
eeb2f20a L |
1666 | h->needs_copy = 1; |
1667 | } | |
1668 | ||
1669 | return _bfd_elf_adjust_dynamic_copy (info, h, s); | |
1670 | } | |
1671 | ||
6999821f L |
1672 | /* Return TRUE if a symbol is referenced locally. It is similar to |
1673 | SYMBOL_REFERENCES_LOCAL, but it also checks version script. It | |
1674 | works in check_relocs. */ | |
1675 | ||
1676 | bfd_boolean | |
1677 | _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info, | |
1678 | struct elf_link_hash_entry *h) | |
1679 | { | |
0a27fed7 L |
1680 | struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); |
1681 | struct elf_x86_link_hash_table *htab | |
1682 | = (struct elf_x86_link_hash_table *) info->hash; | |
6999821f L |
1683 | |
1684 | if (eh->local_ref > 1) | |
1685 | return TRUE; | |
1686 | ||
1687 | if (eh->local_ref == 1) | |
1688 | return FALSE; | |
1689 | ||
1690 | /* Unversioned symbols defined in regular objects can be forced local | |
0a27fed7 L |
1691 | by linker version script. A weak undefined symbol is forced local |
1692 | if | |
1693 | 1. It has non-default visibility. Or | |
8fbf0ba1 | 1694 | 2. When building executable, there is no dynamic linker. Or |
0a27fed7 L |
1695 | 3. or "-z nodynamic-undefined-weak" is used. |
1696 | */ | |
6999821f | 1697 | if (SYMBOL_REFERENCES_LOCAL (info, h) |
0a27fed7 L |
1698 | || (h->root.type == bfd_link_hash_undefweak |
1699 | && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT | |
1700 | || (bfd_link_executable (info) | |
8fbf0ba1 | 1701 | && htab->interp == NULL) |
0a27fed7 | 1702 | || info->dynamic_undefined_weak == 0)) |
6999821f L |
1703 | || ((h->def_regular || ELF_COMMON_DEF_P (h)) |
1704 | && h->versioned == unversioned | |
1705 | && info->version_info != NULL | |
1706 | && bfd_hide_sym_by_version (info->version_info, | |
1707 | h->root.root.string))) | |
1708 | { | |
1709 | eh->local_ref = 2; | |
1710 | return TRUE; | |
1711 | } | |
1712 | ||
1713 | eh->local_ref = 1; | |
1714 | return FALSE; | |
1715 | } | |
1716 | ||
4f501a24 L |
1717 | /* Return the section that should be marked against GC for a given |
1718 | relocation. */ | |
1719 | ||
1720 | asection * | |
1721 | _bfd_x86_elf_gc_mark_hook (asection *sec, | |
1722 | struct bfd_link_info *info, | |
1723 | Elf_Internal_Rela *rel, | |
1724 | struct elf_link_hash_entry *h, | |
1725 | Elf_Internal_Sym *sym) | |
1726 | { | |
1727 | /* Compiler should optimize this out. */ | |
1728 | if (((unsigned int) R_X86_64_GNU_VTINHERIT | |
1729 | != (unsigned int) R_386_GNU_VTINHERIT) | |
1730 | || ((unsigned int) R_X86_64_GNU_VTENTRY | |
1731 | != (unsigned int) R_386_GNU_VTENTRY)) | |
1732 | abort (); | |
1733 | ||
1734 | if (h != NULL) | |
1735 | switch (ELF32_R_TYPE (rel->r_info)) | |
1736 | { | |
1737 | case R_X86_64_GNU_VTINHERIT: | |
1738 | case R_X86_64_GNU_VTENTRY: | |
1739 | return NULL; | |
1740 | } | |
1741 | ||
1742 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
1743 | } | |
1744 | ||
f493882d L |
1745 | static bfd_vma |
1746 | elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED, | |
1747 | bfd_vma off, | |
1748 | bfd_vma offset ATTRIBUTE_UNUSED, | |
1749 | bfd_vma got_addr) | |
1750 | { | |
1751 | return got_addr + off; | |
1752 | } | |
1753 | ||
1754 | static bfd_vma | |
1755 | elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p, | |
1756 | bfd_vma off, | |
1757 | bfd_vma offset, | |
1758 | bfd_vma got_addr ATTRIBUTE_UNUSED) | |
1759 | { | |
1760 | return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size; | |
1761 | } | |
1762 | ||
1763 | static bfd_boolean | |
1764 | elf_i386_valid_plt_reloc_p (unsigned int type) | |
1765 | { | |
1766 | return (type == R_386_JUMP_SLOT | |
1767 | || type == R_386_GLOB_DAT | |
1768 | || type == R_386_IRELATIVE); | |
1769 | } | |
1770 | ||
1771 | static bfd_boolean | |
1772 | elf_x86_64_valid_plt_reloc_p (unsigned int type) | |
1773 | { | |
1774 | return (type == R_X86_64_JUMP_SLOT | |
1775 | || type == R_X86_64_GLOB_DAT | |
1776 | || type == R_X86_64_IRELATIVE); | |
1777 | } | |
1778 | ||
1779 | long | |
1780 | _bfd_x86_elf_get_synthetic_symtab (bfd *abfd, | |
1781 | long count, | |
1782 | long relsize, | |
1783 | bfd_vma got_addr, | |
1784 | struct elf_x86_plt plts[], | |
1785 | asymbol **dynsyms, | |
1786 | asymbol **ret) | |
1787 | { | |
1788 | long size, i, n, len; | |
1789 | int j; | |
1790 | unsigned int plt_got_offset, plt_entry_size; | |
1791 | asymbol *s; | |
1792 | bfd_byte *plt_contents; | |
1793 | long dynrelcount; | |
1794 | arelent **dynrelbuf, *p; | |
1795 | char *names; | |
1796 | const struct elf_backend_data *bed; | |
1797 | bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma, | |
1798 | bfd_vma); | |
1799 | bfd_boolean (*valid_plt_reloc_p) (unsigned int); | |
1800 | ||
1801 | if (count == 0) | |
1802 | return -1; | |
1803 | ||
1804 | dynrelbuf = (arelent **) bfd_malloc (relsize); | |
1805 | if (dynrelbuf == NULL) | |
1806 | return -1; | |
1807 | ||
1808 | dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf, | |
1809 | dynsyms); | |
b69e9267 | 1810 | if (dynrelcount <= 0) |
94670f6c | 1811 | return -1; |
f493882d L |
1812 | |
1813 | /* Sort the relocs by address. */ | |
1814 | qsort (dynrelbuf, dynrelcount, sizeof (arelent *), | |
1815 | _bfd_x86_elf_compare_relocs); | |
1816 | ||
1817 | size = count * sizeof (asymbol); | |
1818 | ||
1819 | /* Allocate space for @plt suffixes. */ | |
1820 | n = 0; | |
1821 | for (i = 0; i < dynrelcount; i++) | |
1822 | { | |
1823 | p = dynrelbuf[i]; | |
1824 | size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); | |
1825 | if (p->addend != 0) | |
1826 | size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd); | |
1827 | } | |
1828 | ||
1829 | s = *ret = (asymbol *) bfd_zmalloc (size); | |
1830 | if (s == NULL) | |
1831 | goto bad_return; | |
1832 | ||
1833 | bed = get_elf_backend_data (abfd); | |
1834 | ||
1835 | if (bed->target_id == X86_64_ELF_DATA) | |
1836 | { | |
1837 | get_plt_got_vma = elf_x86_64_get_plt_got_vma; | |
1838 | valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p; | |
1839 | } | |
1840 | else | |
1841 | { | |
1842 | get_plt_got_vma = elf_i386_get_plt_got_vma; | |
1843 | valid_plt_reloc_p = elf_i386_valid_plt_reloc_p; | |
1844 | if (got_addr) | |
1845 | { | |
1846 | /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_ | |
1847 | address. */ | |
1848 | asection *sec = bfd_get_section_by_name (abfd, ".got.plt"); | |
1849 | if (sec != NULL) | |
1850 | got_addr = sec->vma; | |
1851 | else | |
1852 | { | |
1853 | sec = bfd_get_section_by_name (abfd, ".got"); | |
1854 | if (sec != NULL) | |
1855 | got_addr = sec->vma; | |
1856 | } | |
1857 | ||
1858 | if (got_addr == (bfd_vma) -1) | |
1859 | goto bad_return; | |
1860 | } | |
1861 | } | |
1862 | ||
1863 | /* Check for each PLT section. */ | |
1864 | names = (char *) (s + count); | |
1865 | size = 0; | |
1866 | n = 0; | |
1867 | for (j = 0; plts[j].name != NULL; j++) | |
1868 | if ((plt_contents = plts[j].contents) != NULL) | |
1869 | { | |
1870 | long k; | |
1871 | bfd_vma offset; | |
1872 | asection *plt; | |
1873 | struct elf_x86_plt *plt_p = &plts[j]; | |
1874 | ||
1875 | plt_got_offset = plt_p->plt_got_offset; | |
1876 | plt_entry_size = plt_p->plt_entry_size; | |
1877 | ||
1878 | plt = plt_p->sec; | |
1879 | ||
1880 | if ((plt_p->type & plt_lazy)) | |
1881 | { | |
1882 | /* Skip PLT0 in lazy PLT. */ | |
1883 | k = 1; | |
1884 | offset = plt_entry_size; | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | k = 0; | |
1889 | offset = 0; | |
1890 | } | |
1891 | ||
1892 | /* Check each PLT entry against dynamic relocations. */ | |
1893 | for (; k < plt_p->count; k++) | |
1894 | { | |
1895 | int off; | |
1896 | bfd_vma got_vma; | |
1897 | long min, max, mid; | |
1898 | ||
1899 | /* Get the GOT offset for i386 or the PC-relative offset | |
1900 | for x86-64, a signed 32-bit integer. */ | |
1901 | off = H_GET_32 (abfd, (plt_contents + offset | |
1902 | + plt_got_offset)); | |
1903 | got_vma = get_plt_got_vma (plt_p, off, offset, got_addr); | |
1904 | ||
1905 | /* Binary search. */ | |
1906 | p = dynrelbuf[0]; | |
1907 | min = 0; | |
1908 | max = dynrelcount; | |
1909 | while ((min + 1) < max) | |
1910 | { | |
1911 | arelent *r; | |
1912 | ||
1913 | mid = (min + max) / 2; | |
1914 | r = dynrelbuf[mid]; | |
1915 | if (got_vma > r->address) | |
1916 | min = mid; | |
1917 | else if (got_vma < r->address) | |
1918 | max = mid; | |
1919 | else | |
1920 | { | |
1921 | p = r; | |
1922 | break; | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */ | |
1927 | if (got_vma == p->address | |
1928 | && p->howto != NULL | |
1929 | && valid_plt_reloc_p (p->howto->type)) | |
1930 | { | |
1931 | *s = **p->sym_ptr_ptr; | |
1932 | /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL | |
1933 | set. Since we are defining a symbol, ensure one | |
1934 | of them is set. */ | |
1935 | if ((s->flags & BSF_LOCAL) == 0) | |
1936 | s->flags |= BSF_GLOBAL; | |
1937 | s->flags |= BSF_SYNTHETIC; | |
1938 | /* This is no longer a section symbol. */ | |
1939 | s->flags &= ~BSF_SECTION_SYM; | |
1940 | s->section = plt; | |
1941 | s->the_bfd = plt->owner; | |
1942 | s->value = offset; | |
1943 | s->udata.p = NULL; | |
1944 | s->name = names; | |
1945 | len = strlen ((*p->sym_ptr_ptr)->name); | |
1946 | memcpy (names, (*p->sym_ptr_ptr)->name, len); | |
1947 | names += len; | |
1948 | if (p->addend != 0) | |
1949 | { | |
1950 | char buf[30], *a; | |
1951 | ||
1952 | memcpy (names, "+0x", sizeof ("+0x") - 1); | |
1953 | names += sizeof ("+0x") - 1; | |
1954 | bfd_sprintf_vma (abfd, buf, p->addend); | |
1955 | for (a = buf; *a == '0'; ++a) | |
1956 | ; | |
1957 | size = strlen (a); | |
1958 | memcpy (names, a, size); | |
1959 | names += size; | |
1960 | } | |
1961 | memcpy (names, "@plt", sizeof ("@plt")); | |
1962 | names += sizeof ("@plt"); | |
1963 | n++; | |
1964 | s++; | |
61e3bf5f L |
1965 | /* There should be only one entry in PLT for a given |
1966 | symbol. Set howto to NULL after processing a PLT | |
1967 | entry to guard against corrupted PLT. */ | |
1968 | p->howto = NULL; | |
f493882d L |
1969 | } |
1970 | offset += plt_entry_size; | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | /* PLT entries with R_386_TLS_DESC relocations are skipped. */ | |
1975 | if (n == 0) | |
1976 | { | |
1977 | bad_return: | |
1978 | count = -1; | |
1979 | } | |
1980 | else | |
1981 | count = n; | |
1982 | ||
1983 | for (j = 0; plts[j].name != NULL; j++) | |
1984 | if (plts[j].contents != NULL) | |
1985 | free (plts[j].contents); | |
1986 | ||
1987 | free (dynrelbuf); | |
1988 | ||
1989 | return count; | |
1990 | } | |
1991 | ||
0afcef53 L |
1992 | /* Parse x86 GNU properties. */ |
1993 | ||
1994 | enum elf_property_kind | |
1995 | _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type, | |
1996 | bfd_byte *ptr, unsigned int datasz) | |
1997 | { | |
1998 | elf_property *prop; | |
1999 | ||
2000 | switch (type) | |
2001 | { | |
2002 | case GNU_PROPERTY_X86_ISA_1_USED: | |
2003 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
2004 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
2005 | if (datasz != 4) | |
2006 | { | |
2007 | _bfd_error_handler | |
2008 | ((type == GNU_PROPERTY_X86_ISA_1_USED | |
2009 | ? _("error: %B: <corrupt x86 ISA used size: 0x%x>") | |
2010 | : (type == GNU_PROPERTY_X86_ISA_1_NEEDED | |
2011 | ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>") | |
2012 | : _("error: %B: <corrupt x86 feature size: 0x%x>"))), | |
2013 | abfd, datasz); | |
2014 | return property_corrupt; | |
2015 | } | |
2016 | prop = _bfd_elf_get_property (abfd, type, datasz); | |
2017 | /* Combine properties of the same type. */ | |
2018 | prop->u.number |= bfd_h_get_32 (abfd, ptr); | |
2019 | prop->pr_kind = property_number; | |
2020 | break; | |
2021 | ||
2022 | default: | |
2023 | return property_ignored; | |
2024 | } | |
2025 | ||
2026 | return property_number; | |
2027 | } | |
2028 | ||
2029 | /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL, | |
2030 | return TRUE if APROP is updated. Otherwise, return TRUE if BPROP | |
2031 | should be merged with ABFD. */ | |
2032 | ||
2033 | bfd_boolean | |
2034 | _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info, | |
2035 | bfd *abfd ATTRIBUTE_UNUSED, | |
2036 | elf_property *aprop, | |
2037 | elf_property *bprop) | |
2038 | { | |
2039 | unsigned int number, features; | |
2040 | bfd_boolean updated = FALSE; | |
2041 | unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type; | |
2042 | ||
2043 | switch (pr_type) | |
2044 | { | |
2045 | case GNU_PROPERTY_X86_ISA_1_USED: | |
2046 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
2047 | if (aprop != NULL && bprop != NULL) | |
2048 | { | |
2049 | number = aprop->u.number; | |
2050 | aprop->u.number = number | bprop->u.number; | |
2051 | updated = number != (unsigned int) aprop->u.number; | |
2052 | } | |
2053 | else | |
2054 | { | |
2055 | /* Return TRUE if APROP is NULL to indicate that BPROP should | |
2056 | be added to ABFD. */ | |
2057 | updated = aprop == NULL; | |
2058 | } | |
2059 | break; | |
2060 | ||
2061 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
2062 | /* Only one of APROP and BPROP can be NULL: | |
2063 | 1. APROP & BPROP when both APROP and BPROP aren't NULL. | |
2064 | 2. If APROP is NULL, remove x86 feature. | |
2065 | 3. Otherwise, do nothing. | |
2066 | */ | |
2067 | if (aprop != NULL && bprop != NULL) | |
2068 | { | |
2069 | features = 0; | |
2070 | if (info->ibt) | |
2071 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2072 | if (info->shstk) | |
2073 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2074 | number = aprop->u.number; | |
2075 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2076 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2077 | aprop->u.number = (number & bprop->u.number) | features; | |
2078 | updated = number != (unsigned int) aprop->u.number; | |
2079 | /* Remove the property if all feature bits are cleared. */ | |
2080 | if (aprop->u.number == 0) | |
2081 | aprop->pr_kind = property_remove; | |
2082 | } | |
2083 | else | |
2084 | { | |
2085 | features = 0; | |
2086 | if (info->ibt) | |
2087 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2088 | if (info->shstk) | |
2089 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2090 | if (features) | |
2091 | { | |
2092 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2093 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2094 | if (aprop != NULL) | |
2095 | { | |
2096 | number = aprop->u.number; | |
2097 | aprop->u.number = number | features; | |
2098 | updated = number != (unsigned int) aprop->u.number; | |
2099 | } | |
2100 | else | |
2101 | { | |
2102 | bprop->u.number |= features; | |
2103 | updated = TRUE; | |
2104 | } | |
2105 | } | |
2106 | else if (aprop != NULL) | |
2107 | { | |
2108 | aprop->pr_kind = property_remove; | |
2109 | updated = TRUE; | |
2110 | } | |
2111 | } | |
2112 | break; | |
2113 | ||
2114 | default: | |
2115 | /* Never should happen. */ | |
2116 | abort (); | |
2117 | } | |
2118 | ||
2119 | return updated; | |
2120 | } | |
a6798bab L |
2121 | |
2122 | /* Set up x86 GNU properties. Return the first relocatable ELF input | |
2123 | with GNU properties if found. Otherwise, return NULL. */ | |
2124 | ||
2125 | bfd * | |
2126 | _bfd_x86_elf_link_setup_gnu_properties | |
1de031c8 | 2127 | (struct bfd_link_info *info, struct elf_x86_init_table *init_table) |
a6798bab L |
2128 | { |
2129 | bfd_boolean normal_target; | |
2130 | bfd_boolean lazy_plt; | |
2131 | asection *sec, *pltsec; | |
2132 | bfd *dynobj; | |
2133 | bfd_boolean use_ibt_plt; | |
2134 | unsigned int plt_alignment, features; | |
2135 | struct elf_x86_link_hash_table *htab; | |
2136 | bfd *pbfd; | |
2137 | bfd *ebfd = NULL; | |
2138 | elf_property *prop; | |
2139 | const struct elf_backend_data *bed; | |
2140 | unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2; | |
2141 | unsigned int got_align; | |
2142 | ||
2143 | features = 0; | |
2144 | if (info->ibt) | |
2145 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
2146 | if (info->shstk) | |
2147 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
2148 | ||
2149 | /* Find a normal input file with GNU property note. */ | |
2150 | for (pbfd = info->input_bfds; | |
2151 | pbfd != NULL; | |
2152 | pbfd = pbfd->link.next) | |
2153 | if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour | |
2154 | && bfd_count_sections (pbfd) != 0) | |
2155 | { | |
2156 | ebfd = pbfd; | |
2157 | ||
2158 | if (elf_properties (pbfd) != NULL) | |
2159 | break; | |
2160 | } | |
2161 | ||
2162 | if (ebfd != NULL && features) | |
2163 | { | |
2164 | /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
2165 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
2166 | prop = _bfd_elf_get_property (ebfd, | |
2167 | GNU_PROPERTY_X86_FEATURE_1_AND, | |
2168 | 4); | |
2169 | prop->u.number |= features; | |
2170 | prop->pr_kind = property_number; | |
2171 | ||
2172 | /* Create the GNU property note section if needed. */ | |
2173 | if (pbfd == NULL) | |
2174 | { | |
2175 | sec = bfd_make_section_with_flags (ebfd, | |
2176 | NOTE_GNU_PROPERTY_SECTION_NAME, | |
2177 | (SEC_ALLOC | |
2178 | | SEC_LOAD | |
2179 | | SEC_IN_MEMORY | |
2180 | | SEC_READONLY | |
2181 | | SEC_HAS_CONTENTS | |
2182 | | SEC_DATA)); | |
2183 | if (sec == NULL) | |
2184 | info->callbacks->einfo (_("%F: failed to create GNU property section\n")); | |
2185 | ||
2186 | if (!bfd_set_section_alignment (ebfd, sec, class_align)) | |
2187 | { | |
2188 | error_alignment: | |
2189 | info->callbacks->einfo (_("%F%A: failed to align section\n"), | |
2190 | sec); | |
2191 | } | |
2192 | ||
2193 | elf_section_type (sec) = SHT_NOTE; | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | pbfd = _bfd_elf_link_setup_gnu_properties (info); | |
2198 | ||
a6798bab L |
2199 | bed = get_elf_backend_data (info->output_bfd); |
2200 | ||
2201 | htab = elf_x86_hash_table (info, bed->target_id); | |
2202 | if (htab == NULL) | |
2203 | return pbfd; | |
2204 | ||
1de031c8 L |
2205 | htab->is_vxworks = init_table->is_vxworks; |
2206 | htab->r_info = init_table->r_info; | |
2207 | htab->r_sym = init_table->r_sym; | |
7a382c1c L |
2208 | |
2209 | if (bfd_link_relocatable (info)) | |
2210 | return pbfd; | |
eeb2f20a | 2211 | |
a6798bab L |
2212 | use_ibt_plt = info->ibtplt || info->ibt; |
2213 | if (!use_ibt_plt && pbfd != NULL) | |
2214 | { | |
2215 | /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */ | |
2216 | elf_property_list *p; | |
2217 | ||
2218 | /* The property list is sorted in order of type. */ | |
2219 | for (p = elf_properties (pbfd); p; p = p->next) | |
2220 | { | |
2221 | if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type) | |
2222 | { | |
2223 | use_ibt_plt = !!(p->property.u.number | |
2224 | & GNU_PROPERTY_X86_FEATURE_1_IBT); | |
2225 | break; | |
2226 | } | |
2227 | else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type) | |
2228 | break; | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | dynobj = htab->elf.dynobj; | |
2233 | ||
2234 | /* Set htab->elf.dynobj here so that there is no need to check and | |
2235 | set it in check_relocs. */ | |
2236 | if (dynobj == NULL) | |
2237 | { | |
2238 | if (pbfd != NULL) | |
2239 | { | |
2240 | htab->elf.dynobj = pbfd; | |
2241 | dynobj = pbfd; | |
2242 | } | |
2243 | else | |
2244 | { | |
2245 | bfd *abfd; | |
2246 | ||
2247 | /* Find a normal input file to hold linker created | |
2248 | sections. */ | |
2249 | for (abfd = info->input_bfds; | |
2250 | abfd != NULL; | |
2251 | abfd = abfd->link.next) | |
2252 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour | |
2253 | && (abfd->flags | |
2254 | & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0) | |
2255 | { | |
2256 | htab->elf.dynobj = abfd; | |
2257 | dynobj = abfd; | |
2258 | break; | |
2259 | } | |
2260 | } | |
2261 | } | |
2262 | ||
2263 | /* Even when lazy binding is disabled by "-z now", the PLT0 entry may | |
2264 | still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for | |
2265 | canonical function address. */ | |
2266 | htab->plt.has_plt0 = 1; | |
1de031c8 | 2267 | normal_target = init_table->normal_target; |
a6798bab L |
2268 | |
2269 | if (normal_target) | |
2270 | { | |
2271 | if (use_ibt_plt) | |
2272 | { | |
1de031c8 L |
2273 | htab->lazy_plt = init_table->lazy_ibt_plt; |
2274 | htab->non_lazy_plt = init_table->non_lazy_ibt_plt; | |
a6798bab L |
2275 | } |
2276 | else | |
2277 | { | |
1de031c8 L |
2278 | htab->lazy_plt = init_table->lazy_plt; |
2279 | htab->non_lazy_plt = init_table->non_lazy_plt; | |
a6798bab L |
2280 | } |
2281 | } | |
2282 | else | |
2283 | { | |
1de031c8 | 2284 | htab->lazy_plt = init_table->lazy_plt; |
a6798bab L |
2285 | htab->non_lazy_plt = NULL; |
2286 | } | |
2287 | ||
2288 | pltsec = htab->elf.splt; | |
2289 | ||
2290 | /* If the non-lazy PLT is available, use it for all PLT entries if | |
2291 | there are no PLT0 or no .plt section. */ | |
2292 | if (htab->non_lazy_plt != NULL | |
2293 | && (!htab->plt.has_plt0 || pltsec == NULL)) | |
2294 | { | |
2295 | lazy_plt = FALSE; | |
2296 | if (bfd_link_pic (info)) | |
2297 | htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry; | |
2298 | else | |
2299 | htab->plt.plt_entry = htab->non_lazy_plt->plt_entry; | |
2300 | htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size; | |
2301 | htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset; | |
2302 | htab->plt.plt_got_insn_size | |
2303 | = htab->non_lazy_plt->plt_got_insn_size; | |
2304 | htab->plt.eh_frame_plt_size | |
2305 | = htab->non_lazy_plt->eh_frame_plt_size; | |
2306 | htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt; | |
2307 | } | |
2308 | else | |
2309 | { | |
2310 | lazy_plt = TRUE; | |
2311 | if (bfd_link_pic (info)) | |
2312 | { | |
2313 | htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry; | |
2314 | htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry; | |
2315 | } | |
2316 | else | |
2317 | { | |
2318 | htab->plt.plt0_entry = htab->lazy_plt->plt0_entry; | |
2319 | htab->plt.plt_entry = htab->lazy_plt->plt_entry; | |
2320 | } | |
2321 | htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size; | |
2322 | htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset; | |
2323 | htab->plt.plt_got_insn_size | |
2324 | = htab->lazy_plt->plt_got_insn_size; | |
2325 | htab->plt.eh_frame_plt_size | |
2326 | = htab->lazy_plt->eh_frame_plt_size; | |
2327 | htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt; | |
2328 | } | |
2329 | ||
2330 | /* Return if there are no normal input files. */ | |
2331 | if (dynobj == NULL) | |
2332 | return pbfd; | |
2333 | ||
eeb2f20a | 2334 | if (htab->is_vxworks |
a6798bab L |
2335 | && !elf_vxworks_create_dynamic_sections (dynobj, info, |
2336 | &htab->srelplt2)) | |
2337 | { | |
2338 | info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n")); | |
2339 | return pbfd; | |
2340 | } | |
2341 | ||
2342 | /* Since create_dynamic_sections isn't always called, but GOT | |
2343 | relocations need GOT relocations, create them here so that we | |
2344 | don't need to do it in check_relocs. */ | |
2345 | if (htab->elf.sgot == NULL | |
2346 | && !_bfd_elf_create_got_section (dynobj, info)) | |
2347 | info->callbacks->einfo (_("%F: failed to create GOT sections\n")); | |
2348 | ||
2349 | got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2; | |
2350 | ||
2351 | /* Align .got and .got.plt sections to their entry size. Do it here | |
2352 | instead of in create_dynamic_sections so that they are always | |
2353 | properly aligned even if create_dynamic_sections isn't called. */ | |
2354 | sec = htab->elf.sgot; | |
2355 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2356 | goto error_alignment; | |
2357 | ||
2358 | sec = htab->elf.sgotplt; | |
2359 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
2360 | goto error_alignment; | |
2361 | ||
2362 | /* Create the ifunc sections here so that check_relocs can be | |
2363 | simplified. */ | |
2364 | if (!_bfd_elf_create_ifunc_sections (dynobj, info)) | |
2365 | info->callbacks->einfo (_("%F: failed to create ifunc sections\n")); | |
2366 | ||
2367 | plt_alignment = bfd_log2 (htab->plt.plt_entry_size); | |
2368 | ||
2369 | if (pltsec != NULL) | |
2370 | { | |
2371 | /* Whe creating executable, set the contents of the .interp | |
2372 | section to the interpreter. */ | |
2373 | if (bfd_link_executable (info) && !info->nointerp) | |
2374 | { | |
2375 | asection *s = bfd_get_linker_section (dynobj, ".interp"); | |
2376 | if (s == NULL) | |
2377 | abort (); | |
2378 | s->size = htab->dynamic_interpreter_size; | |
2379 | s->contents = (unsigned char *) htab->dynamic_interpreter; | |
2380 | htab->interp = s; | |
2381 | } | |
2382 | ||
2383 | /* Don't change PLT section alignment for NaCl since it uses | |
2384 | 64-byte PLT entry and sets PLT section alignment to 32 | |
2385 | bytes. Don't create additional PLT sections for NaCl. */ | |
2386 | if (normal_target) | |
2387 | { | |
2388 | flagword pltflags = (bed->dynamic_sec_flags | |
2389 | | SEC_ALLOC | |
2390 | | SEC_CODE | |
2391 | | SEC_LOAD | |
2392 | | SEC_READONLY); | |
2393 | unsigned int non_lazy_plt_alignment | |
2394 | = bfd_log2 (htab->non_lazy_plt->plt_entry_size); | |
2395 | ||
2396 | sec = pltsec; | |
2397 | if (!bfd_set_section_alignment (sec->owner, sec, | |
2398 | plt_alignment)) | |
2399 | goto error_alignment; | |
2400 | ||
2401 | /* Create the GOT procedure linkage table. */ | |
2402 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2403 | ".plt.got", | |
2404 | pltflags); | |
2405 | if (sec == NULL) | |
2406 | info->callbacks->einfo (_("%F: failed to create GOT PLT section\n")); | |
2407 | ||
2408 | if (!bfd_set_section_alignment (dynobj, sec, | |
2409 | non_lazy_plt_alignment)) | |
2410 | goto error_alignment; | |
2411 | ||
2412 | htab->plt_got = sec; | |
2413 | ||
2414 | if (lazy_plt) | |
2415 | { | |
2416 | sec = NULL; | |
2417 | ||
2418 | if (use_ibt_plt) | |
2419 | { | |
2420 | /* Create the second PLT for Intel IBT support. IBT | |
2421 | PLT is supported only for non-NaCl target and is | |
2422 | is needed only for lazy binding. */ | |
2423 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2424 | ".plt.sec", | |
2425 | pltflags); | |
2426 | if (sec == NULL) | |
2427 | info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n")); | |
2428 | ||
2429 | if (!bfd_set_section_alignment (dynobj, sec, | |
2430 | plt_alignment)) | |
2431 | goto error_alignment; | |
2432 | } | |
2433 | else if (info->bndplt && ABI_64_P (dynobj)) | |
2434 | { | |
2435 | /* Create the second PLT for Intel MPX support. MPX | |
2436 | PLT is supported only for non-NaCl target in 64-bit | |
2437 | mode and is needed only for lazy binding. */ | |
2438 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2439 | ".plt.sec", | |
2440 | pltflags); | |
2441 | if (sec == NULL) | |
2442 | info->callbacks->einfo (_("%F: failed to create BND PLT section\n")); | |
2443 | ||
2444 | if (!bfd_set_section_alignment (dynobj, sec, | |
2445 | non_lazy_plt_alignment)) | |
2446 | goto error_alignment; | |
2447 | } | |
2448 | ||
2449 | htab->plt_second = sec; | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | if (!info->no_ld_generated_unwind_info) | |
2454 | { | |
2455 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | |
2456 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
2457 | | SEC_LINKER_CREATED); | |
2458 | ||
2459 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2460 | ".eh_frame", | |
2461 | flags); | |
2462 | if (sec == NULL) | |
2463 | info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n")); | |
2464 | ||
2465 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2466 | goto error_alignment; | |
2467 | ||
2468 | htab->plt_eh_frame = sec; | |
2469 | ||
2470 | if (htab->plt_got != NULL) | |
2471 | { | |
2472 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2473 | ".eh_frame", | |
2474 | flags); | |
2475 | if (sec == NULL) | |
2476 | info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n")); | |
2477 | ||
2478 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2479 | goto error_alignment; | |
2480 | ||
2481 | htab->plt_got_eh_frame = sec; | |
2482 | } | |
2483 | ||
2484 | if (htab->plt_second != NULL) | |
2485 | { | |
2486 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
2487 | ".eh_frame", | |
2488 | flags); | |
2489 | if (sec == NULL) | |
2490 | info->callbacks->einfo (_("%F: failed to create the second PLT .eh_frame section\n")); | |
2491 | ||
2492 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
2493 | goto error_alignment; | |
2494 | ||
2495 | htab->plt_second_eh_frame = sec; | |
2496 | } | |
2497 | } | |
2498 | } | |
2499 | ||
2500 | if (normal_target) | |
2501 | { | |
2502 | /* The .iplt section is used for IFUNC symbols in static | |
2503 | executables. */ | |
2504 | sec = htab->elf.iplt; | |
2505 | if (sec != NULL | |
2506 | && !bfd_set_section_alignment (sec->owner, sec, | |
2507 | plt_alignment)) | |
2508 | goto error_alignment; | |
2509 | } | |
2510 | ||
2511 | return pbfd; | |
2512 | } |