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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 L |
33 | |
34 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking | |
35 | executables. Rather than setting it to the beginning of the TLS | |
36 | section, we have to set it to the end. This function may be called | |
37 | multiple times, it is idempotent. */ | |
38 | ||
39 | void | |
40 | _bfd_x86_elf_set_tls_module_base (struct bfd_link_info *info) | |
41 | { | |
42 | struct elf_x86_link_hash_table *htab; | |
43 | struct bfd_link_hash_entry *base; | |
44 | const struct elf_backend_data *bed; | |
45 | ||
46 | if (!bfd_link_executable (info)) | |
47 | return; | |
48 | ||
49 | bed = get_elf_backend_data (info->output_bfd); | |
50 | htab = elf_x86_hash_table (info, bed->target_id); | |
51 | if (htab == NULL) | |
52 | return; | |
53 | ||
54 | base = htab->tls_module_base; | |
55 | if (base == NULL) | |
56 | return; | |
57 | ||
58 | base->u.def.value = htab->elf.tls_size; | |
59 | } | |
60 | ||
61 | /* Return the base VMA address which should be subtracted from real addresses | |
62 | when resolving @dtpoff relocation. | |
63 | This is PT_TLS segment p_vaddr. */ | |
64 | ||
65 | bfd_vma | |
66 | _bfd_x86_elf_dtpoff_base (struct bfd_link_info *info) | |
67 | { | |
68 | /* If tls_sec is NULL, we should have signalled an error already. */ | |
69 | if (elf_hash_table (info)->tls_sec == NULL) | |
70 | return 0; | |
71 | return elf_hash_table (info)->tls_sec->vma; | |
72 | } | |
73 | ||
74 | /* Find any dynamic relocs that apply to read-only sections. */ | |
75 | ||
76 | bfd_boolean | |
77 | _bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry *h, | |
78 | void *inf) | |
79 | { | |
80 | struct elf_x86_link_hash_entry *eh; | |
81 | struct elf_dyn_relocs *p; | |
82 | ||
83 | /* Skip local IFUNC symbols. */ | |
84 | if (h->forced_local && h->type == STT_GNU_IFUNC) | |
85 | return TRUE; | |
86 | ||
87 | eh = (struct elf_x86_link_hash_entry *) h; | |
88 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
89 | { | |
90 | asection *s = p->sec->output_section; | |
91 | ||
92 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
93 | { | |
94 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
95 | ||
96 | info->flags |= DF_TEXTREL; | |
97 | ||
98 | if ((info->warn_shared_textrel && bfd_link_pic (info)) | |
99 | || info->error_textrel) | |
100 | /* xgettext:c-format */ | |
101 | info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"), | |
102 | p->sec->owner, h->root.root.string, | |
103 | p->sec); | |
104 | ||
105 | /* Not an error, just cut short the traversal. */ | |
106 | return FALSE; | |
107 | } | |
108 | } | |
109 | return TRUE; | |
110 | } | |
111 | ||
112 | /* Find and/or create a hash entry for local symbol. */ | |
113 | ||
114 | struct elf_link_hash_entry * | |
115 | _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab, | |
116 | bfd *abfd, const Elf_Internal_Rela *rel, | |
117 | bfd_boolean create) | |
118 | { | |
119 | struct elf_x86_link_hash_entry e, *ret; | |
120 | asection *sec = abfd->sections; | |
121 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, | |
122 | htab->r_sym (rel->r_info)); | |
123 | void **slot; | |
124 | ||
125 | e.elf.indx = sec->id; | |
126 | e.elf.dynstr_index = htab->r_sym (rel->r_info); | |
127 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, | |
128 | create ? INSERT : NO_INSERT); | |
129 | ||
130 | if (!slot) | |
131 | return NULL; | |
132 | ||
133 | if (*slot) | |
134 | { | |
135 | ret = (struct elf_x86_link_hash_entry *) *slot; | |
136 | return &ret->elf; | |
137 | } | |
138 | ||
139 | ret = (struct elf_x86_link_hash_entry *) | |
140 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, | |
141 | sizeof (struct elf_x86_link_hash_entry)); | |
142 | if (ret) | |
143 | { | |
144 | memset (ret, 0, sizeof (*ret)); | |
145 | ret->elf.indx = sec->id; | |
146 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); | |
147 | ret->elf.dynindx = -1; | |
148 | ret->plt_got.offset = (bfd_vma) -1; | |
149 | *slot = ret; | |
150 | } | |
151 | return &ret->elf; | |
152 | } | |
153 | ||
154 | /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN | |
155 | SYNC WITH _bfd_elf_link_hash_newfunc. */ | |
156 | ||
157 | struct bfd_hash_entry * | |
158 | _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry, | |
159 | struct bfd_hash_table *table, | |
160 | const char *string) | |
161 | { | |
162 | /* Allocate the structure if it has not already been allocated by a | |
163 | subclass. */ | |
164 | if (entry == NULL) | |
165 | { | |
166 | entry = (struct bfd_hash_entry *) | |
167 | bfd_hash_allocate (table, | |
168 | sizeof (struct elf_x86_link_hash_entry)); | |
169 | if (entry == NULL) | |
170 | return entry; | |
171 | } | |
172 | ||
173 | /* Call the allocation method of the superclass. */ | |
174 | entry = _bfd_link_hash_newfunc (entry, table, string); | |
175 | if (entry != NULL) | |
176 | { | |
177 | struct elf_x86_link_hash_entry *eh | |
178 | = (struct elf_x86_link_hash_entry *) entry; | |
179 | struct elf_link_hash_table *htab | |
180 | = (struct elf_link_hash_table *) table; | |
181 | ||
182 | memset (&eh->elf.size, 0, | |
183 | (sizeof (struct elf_x86_link_hash_entry) | |
184 | - offsetof (struct elf_link_hash_entry, size))); | |
185 | /* Set local fields. */ | |
186 | eh->elf.indx = -1; | |
187 | eh->elf.dynindx = -1; | |
188 | eh->elf.got = htab->init_got_refcount; | |
189 | eh->elf.plt = htab->init_plt_refcount; | |
190 | /* Assume that we have been called by a non-ELF symbol reader. | |
191 | This flag is then reset by the code which reads an ELF input | |
192 | file. This ensures that a symbol created by a non-ELF symbol | |
193 | reader will have the flag set correctly. */ | |
194 | eh->elf.non_elf = 1; | |
195 | eh->plt_second.offset = (bfd_vma) -1; | |
196 | eh->plt_got.offset = (bfd_vma) -1; | |
197 | eh->tlsdesc_got = (bfd_vma) -1; | |
198 | } | |
199 | ||
200 | return entry; | |
201 | } | |
202 | ||
203 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry | |
204 | for local symbol so that we can handle local STT_GNU_IFUNC symbols | |
205 | as global symbol. We reuse indx and dynstr_index for local symbol | |
206 | hash since they aren't used by global symbols in this backend. */ | |
207 | ||
208 | hashval_t | |
209 | _bfd_x86_elf_local_htab_hash (const void *ptr) | |
210 | { | |
211 | struct elf_link_hash_entry *h | |
212 | = (struct elf_link_hash_entry *) ptr; | |
213 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); | |
214 | } | |
215 | ||
216 | /* Compare local hash entries. */ | |
217 | ||
218 | int | |
219 | _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2) | |
220 | { | |
221 | struct elf_link_hash_entry *h1 | |
222 | = (struct elf_link_hash_entry *) ptr1; | |
223 | struct elf_link_hash_entry *h2 | |
224 | = (struct elf_link_hash_entry *) ptr2; | |
225 | ||
226 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; | |
227 | } | |
228 | ||
229 | /* Destroy an x86 ELF linker hash table. */ | |
230 | ||
765e526c L |
231 | static void |
232 | elf_x86_link_hash_table_free (bfd *obfd) | |
0afcef53 L |
233 | { |
234 | struct elf_x86_link_hash_table *htab | |
235 | = (struct elf_x86_link_hash_table *) obfd->link.hash; | |
236 | ||
237 | if (htab->loc_hash_table) | |
238 | htab_delete (htab->loc_hash_table); | |
239 | if (htab->loc_hash_memory) | |
240 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); | |
241 | _bfd_elf_link_hash_table_free (obfd); | |
242 | } | |
243 | ||
765e526c L |
244 | /* Create an x86 ELF linker hash table. */ |
245 | ||
246 | struct bfd_link_hash_table * | |
247 | _bfd_x86_elf_link_hash_table_create (bfd *abfd) | |
248 | { | |
249 | struct elf_x86_link_hash_table *ret; | |
250 | const struct elf_backend_data *bed; | |
251 | bfd_size_type amt = sizeof (struct elf_x86_link_hash_table); | |
252 | ||
253 | ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt); | |
254 | if (ret == NULL) | |
255 | return NULL; | |
256 | ||
257 | bed = get_elf_backend_data (abfd); | |
258 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, | |
259 | _bfd_x86_elf_link_hash_newfunc, | |
260 | sizeof (struct elf_x86_link_hash_entry), | |
261 | bed->target_id)) | |
262 | { | |
263 | free (ret); | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | #ifdef BFD64 | |
268 | if (ABI_64_P (abfd)) | |
269 | { | |
270 | ret->r_info = elf64_r_info; | |
271 | ret->r_sym = elf64_r_sym; | |
272 | ret->pointer_r_type = R_X86_64_64; | |
273 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; | |
274 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; | |
275 | ret->tls_get_addr = "__tls_get_addr"; | |
276 | } | |
277 | else | |
278 | #endif | |
279 | { | |
280 | ret->r_info = elf32_r_info; | |
281 | ret->r_sym = elf32_r_sym; | |
5b86dbf4 | 282 | if (bed->target_id == X86_64_ELF_DATA) |
765e526c L |
283 | { |
284 | ret->pointer_r_type = R_X86_64_32; | |
285 | ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER; | |
286 | ret->dynamic_interpreter_size | |
287 | = sizeof ELFX32_DYNAMIC_INTERPRETER; | |
288 | ret->tls_get_addr = "__tls_get_addr"; | |
289 | } | |
290 | else | |
291 | { | |
292 | ret->pointer_r_type = R_386_32; | |
293 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; | |
294 | ret->dynamic_interpreter_size | |
295 | = sizeof ELF32_DYNAMIC_INTERPRETER; | |
296 | ret->tls_get_addr = "___tls_get_addr"; | |
297 | } | |
298 | } | |
299 | ||
300 | ret->loc_hash_table = htab_try_create (1024, | |
301 | _bfd_x86_elf_local_htab_hash, | |
302 | _bfd_x86_elf_local_htab_eq, | |
303 | NULL); | |
304 | ret->loc_hash_memory = objalloc_create (); | |
305 | if (!ret->loc_hash_table || !ret->loc_hash_memory) | |
306 | { | |
307 | elf_x86_link_hash_table_free (abfd); | |
308 | return NULL; | |
309 | } | |
310 | ret->elf.root.hash_table_free = elf_x86_link_hash_table_free; | |
311 | ||
312 | return &ret->elf.root; | |
313 | } | |
314 | ||
0afcef53 L |
315 | /* Sort relocs into address order. */ |
316 | ||
317 | int | |
318 | _bfd_x86_elf_compare_relocs (const void *ap, const void *bp) | |
319 | { | |
320 | const arelent *a = * (const arelent **) ap; | |
321 | const arelent *b = * (const arelent **) bp; | |
322 | ||
323 | if (a->address > b->address) | |
324 | return 1; | |
325 | else if (a->address < b->address) | |
326 | return -1; | |
327 | else | |
328 | return 0; | |
329 | } | |
330 | ||
331 | bfd_boolean | |
332 | _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info) | |
333 | { | |
334 | if (!bfd_link_relocatable (info)) | |
335 | { | |
336 | /* Check for __tls_get_addr reference. */ | |
337 | struct elf_x86_link_hash_table *htab; | |
338 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
339 | htab = elf_x86_hash_table (info, bed->target_id); | |
340 | if (htab) | |
341 | { | |
342 | struct elf_link_hash_entry *h | |
343 | = elf_link_hash_lookup (elf_hash_table (info), | |
344 | htab->tls_get_addr, | |
345 | FALSE, FALSE, FALSE); | |
346 | if (h != NULL) | |
347 | ((struct elf_x86_link_hash_entry *) h)->tls_get_addr = 1; | |
348 | } | |
349 | } | |
350 | ||
351 | /* Invoke the regular ELF backend linker to do all the work. */ | |
352 | return _bfd_elf_link_check_relocs (abfd, info); | |
353 | } | |
354 | ||
355 | bfd_boolean | |
356 | _bfd_x86_elf_always_size_sections (bfd *output_bfd, | |
357 | struct bfd_link_info *info) | |
358 | { | |
359 | asection *tls_sec = elf_hash_table (info)->tls_sec; | |
360 | ||
361 | if (tls_sec) | |
362 | { | |
363 | struct elf_link_hash_entry *tlsbase; | |
364 | ||
365 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), | |
366 | "_TLS_MODULE_BASE_", | |
367 | FALSE, FALSE, FALSE); | |
368 | ||
369 | if (tlsbase && tlsbase->type == STT_TLS) | |
370 | { | |
371 | struct elf_x86_link_hash_table *htab; | |
372 | struct bfd_link_hash_entry *bh = NULL; | |
373 | const struct elf_backend_data *bed | |
374 | = get_elf_backend_data (output_bfd); | |
375 | ||
376 | htab = elf_x86_hash_table (info, bed->target_id); | |
377 | if (htab == NULL) | |
378 | return FALSE; | |
379 | ||
380 | if (!(_bfd_generic_link_add_one_symbol | |
381 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, | |
382 | tls_sec, 0, NULL, FALSE, | |
383 | bed->collect, &bh))) | |
384 | return FALSE; | |
385 | ||
386 | htab->tls_module_base = bh; | |
387 | ||
388 | tlsbase = (struct elf_link_hash_entry *)bh; | |
389 | tlsbase->def_regular = 1; | |
390 | tlsbase->other = STV_HIDDEN; | |
391 | tlsbase->root.linker_def = 1; | |
392 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); | |
393 | } | |
394 | } | |
395 | ||
396 | return TRUE; | |
397 | } | |
398 | ||
399 | void | |
400 | _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h, | |
401 | const Elf_Internal_Sym *isym, | |
402 | bfd_boolean definition, | |
403 | bfd_boolean dynamic ATTRIBUTE_UNUSED) | |
404 | { | |
405 | if (definition) | |
406 | { | |
407 | struct elf_x86_link_hash_entry *eh | |
408 | = (struct elf_x86_link_hash_entry *) h; | |
409 | eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other) | |
410 | == STV_PROTECTED); | |
411 | } | |
412 | } | |
413 | ||
414 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ | |
415 | ||
416 | void | |
417 | _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info, | |
418 | struct elf_link_hash_entry *dir, | |
419 | struct elf_link_hash_entry *ind) | |
420 | { | |
421 | struct elf_x86_link_hash_entry *edir, *eind; | |
422 | ||
423 | edir = (struct elf_x86_link_hash_entry *) dir; | |
424 | eind = (struct elf_x86_link_hash_entry *) ind; | |
425 | ||
426 | if (eind->dyn_relocs != NULL) | |
427 | { | |
428 | if (edir->dyn_relocs != NULL) | |
429 | { | |
430 | struct elf_dyn_relocs **pp; | |
431 | struct elf_dyn_relocs *p; | |
432 | ||
433 | /* Add reloc counts against the indirect sym to the direct sym | |
434 | list. Merge any entries against the same section. */ | |
435 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) | |
436 | { | |
437 | struct elf_dyn_relocs *q; | |
438 | ||
439 | for (q = edir->dyn_relocs; q != NULL; q = q->next) | |
440 | if (q->sec == p->sec) | |
441 | { | |
442 | q->pc_count += p->pc_count; | |
443 | q->count += p->count; | |
444 | *pp = p->next; | |
445 | break; | |
446 | } | |
447 | if (q == NULL) | |
448 | pp = &p->next; | |
449 | } | |
450 | *pp = edir->dyn_relocs; | |
451 | } | |
452 | ||
453 | edir->dyn_relocs = eind->dyn_relocs; | |
454 | eind->dyn_relocs = NULL; | |
455 | } | |
456 | ||
457 | if (ind->root.type == bfd_link_hash_indirect | |
458 | && dir->got.refcount <= 0) | |
459 | { | |
460 | edir->tls_type = eind->tls_type; | |
461 | eind->tls_type = GOT_UNKNOWN; | |
462 | } | |
463 | ||
464 | /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will | |
465 | generate a R_386_COPY reloc. */ | |
466 | edir->gotoff_ref |= eind->gotoff_ref; | |
467 | ||
468 | edir->has_got_reloc |= eind->has_got_reloc; | |
469 | edir->has_non_got_reloc |= eind->has_non_got_reloc; | |
470 | ||
471 | if (ELIMINATE_COPY_RELOCS | |
472 | && ind->root.type != bfd_link_hash_indirect | |
473 | && dir->dynamic_adjusted) | |
474 | { | |
475 | /* If called to transfer flags for a weakdef during processing | |
476 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. | |
477 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ | |
478 | if (dir->versioned != versioned_hidden) | |
479 | dir->ref_dynamic |= ind->ref_dynamic; | |
480 | dir->ref_regular |= ind->ref_regular; | |
481 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; | |
482 | dir->needs_plt |= ind->needs_plt; | |
483 | dir->pointer_equality_needed |= ind->pointer_equality_needed; | |
484 | } | |
485 | else | |
486 | { | |
487 | if (eind->func_pointer_refcount > 0) | |
488 | { | |
489 | edir->func_pointer_refcount += eind->func_pointer_refcount; | |
490 | eind->func_pointer_refcount = 0; | |
491 | } | |
492 | ||
493 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); | |
494 | } | |
495 | } | |
496 | ||
497 | /* Remove undefined weak symbol from the dynamic symbol table if it | |
498 | is resolved to 0. */ | |
499 | ||
500 | bfd_boolean | |
501 | _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info, | |
502 | struct elf_link_hash_entry *h) | |
503 | { | |
504 | if (h->dynindx != -1) | |
505 | { | |
506 | const struct elf_backend_data *bed | |
507 | = get_elf_backend_data (info->output_bfd); | |
508 | if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, | |
509 | bed->target_id, | |
510 | elf_x86_hash_entry (h)->has_got_reloc, | |
511 | elf_x86_hash_entry (h))) | |
512 | { | |
513 | h->dynindx = -1; | |
514 | _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, | |
515 | h->dynstr_index); | |
516 | } | |
517 | } | |
518 | return TRUE; | |
519 | } | |
520 | ||
521 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ | |
522 | ||
523 | bfd_boolean | |
524 | _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h) | |
525 | { | |
526 | if (h->plt.offset != (bfd_vma) -1 | |
527 | && !h->def_regular | |
528 | && !h->pointer_equality_needed) | |
529 | return FALSE; | |
530 | ||
531 | return _bfd_elf_hash_symbol (h); | |
532 | } | |
533 | ||
f493882d L |
534 | static bfd_vma |
535 | elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED, | |
536 | bfd_vma off, | |
537 | bfd_vma offset ATTRIBUTE_UNUSED, | |
538 | bfd_vma got_addr) | |
539 | { | |
540 | return got_addr + off; | |
541 | } | |
542 | ||
543 | static bfd_vma | |
544 | elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p, | |
545 | bfd_vma off, | |
546 | bfd_vma offset, | |
547 | bfd_vma got_addr ATTRIBUTE_UNUSED) | |
548 | { | |
549 | return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size; | |
550 | } | |
551 | ||
552 | static bfd_boolean | |
553 | elf_i386_valid_plt_reloc_p (unsigned int type) | |
554 | { | |
555 | return (type == R_386_JUMP_SLOT | |
556 | || type == R_386_GLOB_DAT | |
557 | || type == R_386_IRELATIVE); | |
558 | } | |
559 | ||
560 | static bfd_boolean | |
561 | elf_x86_64_valid_plt_reloc_p (unsigned int type) | |
562 | { | |
563 | return (type == R_X86_64_JUMP_SLOT | |
564 | || type == R_X86_64_GLOB_DAT | |
565 | || type == R_X86_64_IRELATIVE); | |
566 | } | |
567 | ||
568 | long | |
569 | _bfd_x86_elf_get_synthetic_symtab (bfd *abfd, | |
570 | long count, | |
571 | long relsize, | |
572 | bfd_vma got_addr, | |
573 | struct elf_x86_plt plts[], | |
574 | asymbol **dynsyms, | |
575 | asymbol **ret) | |
576 | { | |
577 | long size, i, n, len; | |
578 | int j; | |
579 | unsigned int plt_got_offset, plt_entry_size; | |
580 | asymbol *s; | |
581 | bfd_byte *plt_contents; | |
582 | long dynrelcount; | |
583 | arelent **dynrelbuf, *p; | |
584 | char *names; | |
585 | const struct elf_backend_data *bed; | |
586 | bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma, | |
587 | bfd_vma); | |
588 | bfd_boolean (*valid_plt_reloc_p) (unsigned int); | |
589 | ||
590 | if (count == 0) | |
591 | return -1; | |
592 | ||
593 | dynrelbuf = (arelent **) bfd_malloc (relsize); | |
594 | if (dynrelbuf == NULL) | |
595 | return -1; | |
596 | ||
597 | dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf, | |
598 | dynsyms); | |
599 | ||
600 | /* Sort the relocs by address. */ | |
601 | qsort (dynrelbuf, dynrelcount, sizeof (arelent *), | |
602 | _bfd_x86_elf_compare_relocs); | |
603 | ||
604 | size = count * sizeof (asymbol); | |
605 | ||
606 | /* Allocate space for @plt suffixes. */ | |
607 | n = 0; | |
608 | for (i = 0; i < dynrelcount; i++) | |
609 | { | |
610 | p = dynrelbuf[i]; | |
611 | size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); | |
612 | if (p->addend != 0) | |
613 | size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd); | |
614 | } | |
615 | ||
616 | s = *ret = (asymbol *) bfd_zmalloc (size); | |
617 | if (s == NULL) | |
618 | goto bad_return; | |
619 | ||
620 | bed = get_elf_backend_data (abfd); | |
621 | ||
622 | if (bed->target_id == X86_64_ELF_DATA) | |
623 | { | |
624 | get_plt_got_vma = elf_x86_64_get_plt_got_vma; | |
625 | valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p; | |
626 | } | |
627 | else | |
628 | { | |
629 | get_plt_got_vma = elf_i386_get_plt_got_vma; | |
630 | valid_plt_reloc_p = elf_i386_valid_plt_reloc_p; | |
631 | if (got_addr) | |
632 | { | |
633 | /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_ | |
634 | address. */ | |
635 | asection *sec = bfd_get_section_by_name (abfd, ".got.plt"); | |
636 | if (sec != NULL) | |
637 | got_addr = sec->vma; | |
638 | else | |
639 | { | |
640 | sec = bfd_get_section_by_name (abfd, ".got"); | |
641 | if (sec != NULL) | |
642 | got_addr = sec->vma; | |
643 | } | |
644 | ||
645 | if (got_addr == (bfd_vma) -1) | |
646 | goto bad_return; | |
647 | } | |
648 | } | |
649 | ||
650 | /* Check for each PLT section. */ | |
651 | names = (char *) (s + count); | |
652 | size = 0; | |
653 | n = 0; | |
654 | for (j = 0; plts[j].name != NULL; j++) | |
655 | if ((plt_contents = plts[j].contents) != NULL) | |
656 | { | |
657 | long k; | |
658 | bfd_vma offset; | |
659 | asection *plt; | |
660 | struct elf_x86_plt *plt_p = &plts[j]; | |
661 | ||
662 | plt_got_offset = plt_p->plt_got_offset; | |
663 | plt_entry_size = plt_p->plt_entry_size; | |
664 | ||
665 | plt = plt_p->sec; | |
666 | ||
667 | if ((plt_p->type & plt_lazy)) | |
668 | { | |
669 | /* Skip PLT0 in lazy PLT. */ | |
670 | k = 1; | |
671 | offset = plt_entry_size; | |
672 | } | |
673 | else | |
674 | { | |
675 | k = 0; | |
676 | offset = 0; | |
677 | } | |
678 | ||
679 | /* Check each PLT entry against dynamic relocations. */ | |
680 | for (; k < plt_p->count; k++) | |
681 | { | |
682 | int off; | |
683 | bfd_vma got_vma; | |
684 | long min, max, mid; | |
685 | ||
686 | /* Get the GOT offset for i386 or the PC-relative offset | |
687 | for x86-64, a signed 32-bit integer. */ | |
688 | off = H_GET_32 (abfd, (plt_contents + offset | |
689 | + plt_got_offset)); | |
690 | got_vma = get_plt_got_vma (plt_p, off, offset, got_addr); | |
691 | ||
692 | /* Binary search. */ | |
693 | p = dynrelbuf[0]; | |
694 | min = 0; | |
695 | max = dynrelcount; | |
696 | while ((min + 1) < max) | |
697 | { | |
698 | arelent *r; | |
699 | ||
700 | mid = (min + max) / 2; | |
701 | r = dynrelbuf[mid]; | |
702 | if (got_vma > r->address) | |
703 | min = mid; | |
704 | else if (got_vma < r->address) | |
705 | max = mid; | |
706 | else | |
707 | { | |
708 | p = r; | |
709 | break; | |
710 | } | |
711 | } | |
712 | ||
713 | /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */ | |
714 | if (got_vma == p->address | |
715 | && p->howto != NULL | |
716 | && valid_plt_reloc_p (p->howto->type)) | |
717 | { | |
718 | *s = **p->sym_ptr_ptr; | |
719 | /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL | |
720 | set. Since we are defining a symbol, ensure one | |
721 | of them is set. */ | |
722 | if ((s->flags & BSF_LOCAL) == 0) | |
723 | s->flags |= BSF_GLOBAL; | |
724 | s->flags |= BSF_SYNTHETIC; | |
725 | /* This is no longer a section symbol. */ | |
726 | s->flags &= ~BSF_SECTION_SYM; | |
727 | s->section = plt; | |
728 | s->the_bfd = plt->owner; | |
729 | s->value = offset; | |
730 | s->udata.p = NULL; | |
731 | s->name = names; | |
732 | len = strlen ((*p->sym_ptr_ptr)->name); | |
733 | memcpy (names, (*p->sym_ptr_ptr)->name, len); | |
734 | names += len; | |
735 | if (p->addend != 0) | |
736 | { | |
737 | char buf[30], *a; | |
738 | ||
739 | memcpy (names, "+0x", sizeof ("+0x") - 1); | |
740 | names += sizeof ("+0x") - 1; | |
741 | bfd_sprintf_vma (abfd, buf, p->addend); | |
742 | for (a = buf; *a == '0'; ++a) | |
743 | ; | |
744 | size = strlen (a); | |
745 | memcpy (names, a, size); | |
746 | names += size; | |
747 | } | |
748 | memcpy (names, "@plt", sizeof ("@plt")); | |
749 | names += sizeof ("@plt"); | |
750 | n++; | |
751 | s++; | |
752 | } | |
753 | offset += plt_entry_size; | |
754 | } | |
755 | } | |
756 | ||
757 | /* PLT entries with R_386_TLS_DESC relocations are skipped. */ | |
758 | if (n == 0) | |
759 | { | |
760 | bad_return: | |
761 | count = -1; | |
762 | } | |
763 | else | |
764 | count = n; | |
765 | ||
766 | for (j = 0; plts[j].name != NULL; j++) | |
767 | if (plts[j].contents != NULL) | |
768 | free (plts[j].contents); | |
769 | ||
770 | free (dynrelbuf); | |
771 | ||
772 | return count; | |
773 | } | |
774 | ||
0afcef53 L |
775 | /* Parse x86 GNU properties. */ |
776 | ||
777 | enum elf_property_kind | |
778 | _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type, | |
779 | bfd_byte *ptr, unsigned int datasz) | |
780 | { | |
781 | elf_property *prop; | |
782 | ||
783 | switch (type) | |
784 | { | |
785 | case GNU_PROPERTY_X86_ISA_1_USED: | |
786 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
787 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
788 | if (datasz != 4) | |
789 | { | |
790 | _bfd_error_handler | |
791 | ((type == GNU_PROPERTY_X86_ISA_1_USED | |
792 | ? _("error: %B: <corrupt x86 ISA used size: 0x%x>") | |
793 | : (type == GNU_PROPERTY_X86_ISA_1_NEEDED | |
794 | ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>") | |
795 | : _("error: %B: <corrupt x86 feature size: 0x%x>"))), | |
796 | abfd, datasz); | |
797 | return property_corrupt; | |
798 | } | |
799 | prop = _bfd_elf_get_property (abfd, type, datasz); | |
800 | /* Combine properties of the same type. */ | |
801 | prop->u.number |= bfd_h_get_32 (abfd, ptr); | |
802 | prop->pr_kind = property_number; | |
803 | break; | |
804 | ||
805 | default: | |
806 | return property_ignored; | |
807 | } | |
808 | ||
809 | return property_number; | |
810 | } | |
811 | ||
812 | /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL, | |
813 | return TRUE if APROP is updated. Otherwise, return TRUE if BPROP | |
814 | should be merged with ABFD. */ | |
815 | ||
816 | bfd_boolean | |
817 | _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info, | |
818 | bfd *abfd ATTRIBUTE_UNUSED, | |
819 | elf_property *aprop, | |
820 | elf_property *bprop) | |
821 | { | |
822 | unsigned int number, features; | |
823 | bfd_boolean updated = FALSE; | |
824 | unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type; | |
825 | ||
826 | switch (pr_type) | |
827 | { | |
828 | case GNU_PROPERTY_X86_ISA_1_USED: | |
829 | case GNU_PROPERTY_X86_ISA_1_NEEDED: | |
830 | if (aprop != NULL && bprop != NULL) | |
831 | { | |
832 | number = aprop->u.number; | |
833 | aprop->u.number = number | bprop->u.number; | |
834 | updated = number != (unsigned int) aprop->u.number; | |
835 | } | |
836 | else | |
837 | { | |
838 | /* Return TRUE if APROP is NULL to indicate that BPROP should | |
839 | be added to ABFD. */ | |
840 | updated = aprop == NULL; | |
841 | } | |
842 | break; | |
843 | ||
844 | case GNU_PROPERTY_X86_FEATURE_1_AND: | |
845 | /* Only one of APROP and BPROP can be NULL: | |
846 | 1. APROP & BPROP when both APROP and BPROP aren't NULL. | |
847 | 2. If APROP is NULL, remove x86 feature. | |
848 | 3. Otherwise, do nothing. | |
849 | */ | |
850 | if (aprop != NULL && bprop != NULL) | |
851 | { | |
852 | features = 0; | |
853 | if (info->ibt) | |
854 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
855 | if (info->shstk) | |
856 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
857 | number = aprop->u.number; | |
858 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
859 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
860 | aprop->u.number = (number & bprop->u.number) | features; | |
861 | updated = number != (unsigned int) aprop->u.number; | |
862 | /* Remove the property if all feature bits are cleared. */ | |
863 | if (aprop->u.number == 0) | |
864 | aprop->pr_kind = property_remove; | |
865 | } | |
866 | else | |
867 | { | |
868 | features = 0; | |
869 | if (info->ibt) | |
870 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
871 | if (info->shstk) | |
872 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
873 | if (features) | |
874 | { | |
875 | /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
876 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
877 | if (aprop != NULL) | |
878 | { | |
879 | number = aprop->u.number; | |
880 | aprop->u.number = number | features; | |
881 | updated = number != (unsigned int) aprop->u.number; | |
882 | } | |
883 | else | |
884 | { | |
885 | bprop->u.number |= features; | |
886 | updated = TRUE; | |
887 | } | |
888 | } | |
889 | else if (aprop != NULL) | |
890 | { | |
891 | aprop->pr_kind = property_remove; | |
892 | updated = TRUE; | |
893 | } | |
894 | } | |
895 | break; | |
896 | ||
897 | default: | |
898 | /* Never should happen. */ | |
899 | abort (); | |
900 | } | |
901 | ||
902 | return updated; | |
903 | } | |
a6798bab L |
904 | |
905 | /* Set up x86 GNU properties. Return the first relocatable ELF input | |
906 | with GNU properties if found. Otherwise, return NULL. */ | |
907 | ||
908 | bfd * | |
909 | _bfd_x86_elf_link_setup_gnu_properties | |
910 | (struct bfd_link_info *info, | |
911 | struct elf_x86_plt_layout_table *plt_layout) | |
912 | { | |
913 | bfd_boolean normal_target; | |
914 | bfd_boolean lazy_plt; | |
915 | asection *sec, *pltsec; | |
916 | bfd *dynobj; | |
917 | bfd_boolean use_ibt_plt; | |
918 | unsigned int plt_alignment, features; | |
919 | struct elf_x86_link_hash_table *htab; | |
920 | bfd *pbfd; | |
921 | bfd *ebfd = NULL; | |
922 | elf_property *prop; | |
923 | const struct elf_backend_data *bed; | |
924 | unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2; | |
925 | unsigned int got_align; | |
926 | ||
927 | features = 0; | |
928 | if (info->ibt) | |
929 | features = GNU_PROPERTY_X86_FEATURE_1_IBT; | |
930 | if (info->shstk) | |
931 | features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK; | |
932 | ||
933 | /* Find a normal input file with GNU property note. */ | |
934 | for (pbfd = info->input_bfds; | |
935 | pbfd != NULL; | |
936 | pbfd = pbfd->link.next) | |
937 | if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour | |
938 | && bfd_count_sections (pbfd) != 0) | |
939 | { | |
940 | ebfd = pbfd; | |
941 | ||
942 | if (elf_properties (pbfd) != NULL) | |
943 | break; | |
944 | } | |
945 | ||
946 | if (ebfd != NULL && features) | |
947 | { | |
948 | /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and | |
949 | GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ | |
950 | prop = _bfd_elf_get_property (ebfd, | |
951 | GNU_PROPERTY_X86_FEATURE_1_AND, | |
952 | 4); | |
953 | prop->u.number |= features; | |
954 | prop->pr_kind = property_number; | |
955 | ||
956 | /* Create the GNU property note section if needed. */ | |
957 | if (pbfd == NULL) | |
958 | { | |
959 | sec = bfd_make_section_with_flags (ebfd, | |
960 | NOTE_GNU_PROPERTY_SECTION_NAME, | |
961 | (SEC_ALLOC | |
962 | | SEC_LOAD | |
963 | | SEC_IN_MEMORY | |
964 | | SEC_READONLY | |
965 | | SEC_HAS_CONTENTS | |
966 | | SEC_DATA)); | |
967 | if (sec == NULL) | |
968 | info->callbacks->einfo (_("%F: failed to create GNU property section\n")); | |
969 | ||
970 | if (!bfd_set_section_alignment (ebfd, sec, class_align)) | |
971 | { | |
972 | error_alignment: | |
973 | info->callbacks->einfo (_("%F%A: failed to align section\n"), | |
974 | sec); | |
975 | } | |
976 | ||
977 | elf_section_type (sec) = SHT_NOTE; | |
978 | } | |
979 | } | |
980 | ||
981 | pbfd = _bfd_elf_link_setup_gnu_properties (info); | |
982 | ||
983 | if (bfd_link_relocatable (info)) | |
984 | return pbfd; | |
985 | ||
986 | bed = get_elf_backend_data (info->output_bfd); | |
987 | ||
988 | htab = elf_x86_hash_table (info, bed->target_id); | |
989 | if (htab == NULL) | |
990 | return pbfd; | |
991 | ||
992 | use_ibt_plt = info->ibtplt || info->ibt; | |
993 | if (!use_ibt_plt && pbfd != NULL) | |
994 | { | |
995 | /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */ | |
996 | elf_property_list *p; | |
997 | ||
998 | /* The property list is sorted in order of type. */ | |
999 | for (p = elf_properties (pbfd); p; p = p->next) | |
1000 | { | |
1001 | if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type) | |
1002 | { | |
1003 | use_ibt_plt = !!(p->property.u.number | |
1004 | & GNU_PROPERTY_X86_FEATURE_1_IBT); | |
1005 | break; | |
1006 | } | |
1007 | else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type) | |
1008 | break; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | dynobj = htab->elf.dynobj; | |
1013 | ||
1014 | /* Set htab->elf.dynobj here so that there is no need to check and | |
1015 | set it in check_relocs. */ | |
1016 | if (dynobj == NULL) | |
1017 | { | |
1018 | if (pbfd != NULL) | |
1019 | { | |
1020 | htab->elf.dynobj = pbfd; | |
1021 | dynobj = pbfd; | |
1022 | } | |
1023 | else | |
1024 | { | |
1025 | bfd *abfd; | |
1026 | ||
1027 | /* Find a normal input file to hold linker created | |
1028 | sections. */ | |
1029 | for (abfd = info->input_bfds; | |
1030 | abfd != NULL; | |
1031 | abfd = abfd->link.next) | |
1032 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour | |
1033 | && (abfd->flags | |
1034 | & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0) | |
1035 | { | |
1036 | htab->elf.dynobj = abfd; | |
1037 | dynobj = abfd; | |
1038 | break; | |
1039 | } | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* Even when lazy binding is disabled by "-z now", the PLT0 entry may | |
1044 | still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for | |
1045 | canonical function address. */ | |
1046 | htab->plt.has_plt0 = 1; | |
1047 | normal_target = plt_layout->normal_target; | |
1048 | ||
1049 | if (normal_target) | |
1050 | { | |
1051 | if (use_ibt_plt) | |
1052 | { | |
1053 | htab->lazy_plt = plt_layout->lazy_ibt_plt; | |
1054 | htab->non_lazy_plt = plt_layout->non_lazy_ibt_plt; | |
1055 | } | |
1056 | else | |
1057 | { | |
1058 | htab->lazy_plt = plt_layout->lazy_plt; | |
1059 | htab->non_lazy_plt = plt_layout->non_lazy_plt; | |
1060 | } | |
1061 | } | |
1062 | else | |
1063 | { | |
1064 | htab->lazy_plt = plt_layout->lazy_plt; | |
1065 | htab->non_lazy_plt = NULL; | |
1066 | } | |
1067 | ||
1068 | pltsec = htab->elf.splt; | |
1069 | ||
1070 | /* If the non-lazy PLT is available, use it for all PLT entries if | |
1071 | there are no PLT0 or no .plt section. */ | |
1072 | if (htab->non_lazy_plt != NULL | |
1073 | && (!htab->plt.has_plt0 || pltsec == NULL)) | |
1074 | { | |
1075 | lazy_plt = FALSE; | |
1076 | if (bfd_link_pic (info)) | |
1077 | htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry; | |
1078 | else | |
1079 | htab->plt.plt_entry = htab->non_lazy_plt->plt_entry; | |
1080 | htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size; | |
1081 | htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset; | |
1082 | htab->plt.plt_got_insn_size | |
1083 | = htab->non_lazy_plt->plt_got_insn_size; | |
1084 | htab->plt.eh_frame_plt_size | |
1085 | = htab->non_lazy_plt->eh_frame_plt_size; | |
1086 | htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt; | |
1087 | } | |
1088 | else | |
1089 | { | |
1090 | lazy_plt = TRUE; | |
1091 | if (bfd_link_pic (info)) | |
1092 | { | |
1093 | htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry; | |
1094 | htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry; | |
1095 | } | |
1096 | else | |
1097 | { | |
1098 | htab->plt.plt0_entry = htab->lazy_plt->plt0_entry; | |
1099 | htab->plt.plt_entry = htab->lazy_plt->plt_entry; | |
1100 | } | |
1101 | htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size; | |
1102 | htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset; | |
1103 | htab->plt.plt_got_insn_size | |
1104 | = htab->lazy_plt->plt_got_insn_size; | |
1105 | htab->plt.eh_frame_plt_size | |
1106 | = htab->lazy_plt->eh_frame_plt_size; | |
1107 | htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt; | |
1108 | } | |
1109 | ||
1110 | /* Return if there are no normal input files. */ | |
1111 | if (dynobj == NULL) | |
1112 | return pbfd; | |
1113 | ||
1114 | if (plt_layout->is_vxworks | |
1115 | && !elf_vxworks_create_dynamic_sections (dynobj, info, | |
1116 | &htab->srelplt2)) | |
1117 | { | |
1118 | info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n")); | |
1119 | return pbfd; | |
1120 | } | |
1121 | ||
1122 | /* Since create_dynamic_sections isn't always called, but GOT | |
1123 | relocations need GOT relocations, create them here so that we | |
1124 | don't need to do it in check_relocs. */ | |
1125 | if (htab->elf.sgot == NULL | |
1126 | && !_bfd_elf_create_got_section (dynobj, info)) | |
1127 | info->callbacks->einfo (_("%F: failed to create GOT sections\n")); | |
1128 | ||
1129 | got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2; | |
1130 | ||
1131 | /* Align .got and .got.plt sections to their entry size. Do it here | |
1132 | instead of in create_dynamic_sections so that they are always | |
1133 | properly aligned even if create_dynamic_sections isn't called. */ | |
1134 | sec = htab->elf.sgot; | |
1135 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
1136 | goto error_alignment; | |
1137 | ||
1138 | sec = htab->elf.sgotplt; | |
1139 | if (!bfd_set_section_alignment (dynobj, sec, got_align)) | |
1140 | goto error_alignment; | |
1141 | ||
1142 | /* Create the ifunc sections here so that check_relocs can be | |
1143 | simplified. */ | |
1144 | if (!_bfd_elf_create_ifunc_sections (dynobj, info)) | |
1145 | info->callbacks->einfo (_("%F: failed to create ifunc sections\n")); | |
1146 | ||
1147 | plt_alignment = bfd_log2 (htab->plt.plt_entry_size); | |
1148 | ||
1149 | if (pltsec != NULL) | |
1150 | { | |
1151 | /* Whe creating executable, set the contents of the .interp | |
1152 | section to the interpreter. */ | |
1153 | if (bfd_link_executable (info) && !info->nointerp) | |
1154 | { | |
1155 | asection *s = bfd_get_linker_section (dynobj, ".interp"); | |
1156 | if (s == NULL) | |
1157 | abort (); | |
1158 | s->size = htab->dynamic_interpreter_size; | |
1159 | s->contents = (unsigned char *) htab->dynamic_interpreter; | |
1160 | htab->interp = s; | |
1161 | } | |
1162 | ||
1163 | /* Don't change PLT section alignment for NaCl since it uses | |
1164 | 64-byte PLT entry and sets PLT section alignment to 32 | |
1165 | bytes. Don't create additional PLT sections for NaCl. */ | |
1166 | if (normal_target) | |
1167 | { | |
1168 | flagword pltflags = (bed->dynamic_sec_flags | |
1169 | | SEC_ALLOC | |
1170 | | SEC_CODE | |
1171 | | SEC_LOAD | |
1172 | | SEC_READONLY); | |
1173 | unsigned int non_lazy_plt_alignment | |
1174 | = bfd_log2 (htab->non_lazy_plt->plt_entry_size); | |
1175 | ||
1176 | sec = pltsec; | |
1177 | if (!bfd_set_section_alignment (sec->owner, sec, | |
1178 | plt_alignment)) | |
1179 | goto error_alignment; | |
1180 | ||
1181 | /* Create the GOT procedure linkage table. */ | |
1182 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1183 | ".plt.got", | |
1184 | pltflags); | |
1185 | if (sec == NULL) | |
1186 | info->callbacks->einfo (_("%F: failed to create GOT PLT section\n")); | |
1187 | ||
1188 | if (!bfd_set_section_alignment (dynobj, sec, | |
1189 | non_lazy_plt_alignment)) | |
1190 | goto error_alignment; | |
1191 | ||
1192 | htab->plt_got = sec; | |
1193 | ||
1194 | if (lazy_plt) | |
1195 | { | |
1196 | sec = NULL; | |
1197 | ||
1198 | if (use_ibt_plt) | |
1199 | { | |
1200 | /* Create the second PLT for Intel IBT support. IBT | |
1201 | PLT is supported only for non-NaCl target and is | |
1202 | is needed only for lazy binding. */ | |
1203 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1204 | ".plt.sec", | |
1205 | pltflags); | |
1206 | if (sec == NULL) | |
1207 | info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n")); | |
1208 | ||
1209 | if (!bfd_set_section_alignment (dynobj, sec, | |
1210 | plt_alignment)) | |
1211 | goto error_alignment; | |
1212 | } | |
1213 | else if (info->bndplt && ABI_64_P (dynobj)) | |
1214 | { | |
1215 | /* Create the second PLT for Intel MPX support. MPX | |
1216 | PLT is supported only for non-NaCl target in 64-bit | |
1217 | mode and is needed only for lazy binding. */ | |
1218 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1219 | ".plt.sec", | |
1220 | pltflags); | |
1221 | if (sec == NULL) | |
1222 | info->callbacks->einfo (_("%F: failed to create BND PLT section\n")); | |
1223 | ||
1224 | if (!bfd_set_section_alignment (dynobj, sec, | |
1225 | non_lazy_plt_alignment)) | |
1226 | goto error_alignment; | |
1227 | } | |
1228 | ||
1229 | htab->plt_second = sec; | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | if (!info->no_ld_generated_unwind_info) | |
1234 | { | |
1235 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | |
1236 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
1237 | | SEC_LINKER_CREATED); | |
1238 | ||
1239 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1240 | ".eh_frame", | |
1241 | flags); | |
1242 | if (sec == NULL) | |
1243 | info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n")); | |
1244 | ||
1245 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
1246 | goto error_alignment; | |
1247 | ||
1248 | htab->plt_eh_frame = sec; | |
1249 | ||
1250 | if (htab->plt_got != NULL) | |
1251 | { | |
1252 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1253 | ".eh_frame", | |
1254 | flags); | |
1255 | if (sec == NULL) | |
1256 | info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n")); | |
1257 | ||
1258 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
1259 | goto error_alignment; | |
1260 | ||
1261 | htab->plt_got_eh_frame = sec; | |
1262 | } | |
1263 | ||
1264 | if (htab->plt_second != NULL) | |
1265 | { | |
1266 | sec = bfd_make_section_anyway_with_flags (dynobj, | |
1267 | ".eh_frame", | |
1268 | flags); | |
1269 | if (sec == NULL) | |
1270 | info->callbacks->einfo (_("%F: failed to create the second PLT .eh_frame section\n")); | |
1271 | ||
1272 | if (!bfd_set_section_alignment (dynobj, sec, class_align)) | |
1273 | goto error_alignment; | |
1274 | ||
1275 | htab->plt_second_eh_frame = sec; | |
1276 | } | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | if (normal_target) | |
1281 | { | |
1282 | /* The .iplt section is used for IFUNC symbols in static | |
1283 | executables. */ | |
1284 | sec = htab->elf.iplt; | |
1285 | if (sec != NULL | |
1286 | && !bfd_set_section_alignment (sec->owner, sec, | |
1287 | plt_alignment)) | |
1288 | goto error_alignment; | |
1289 | } | |
1290 | ||
1291 | return pbfd; | |
1292 | } |