1 /* x86 specific support for ELF
2 Copyright (C) 2017 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
21 #include "elfxx-x86.h"
22 #include "elf-vxworks.h"
25 #include "elf/x86-64.h"
27 /* The name of the dynamic interpreter. This is put in the .interp
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"
35 _bfd_x86_elf_mkobject (bfd *abfd)
37 return bfd_elf_allocate_object (abfd,
38 sizeof (struct elf_x86_obj_tdata),
39 get_elf_backend_data (abfd)->target_id);
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. */
48 _bfd_x86_elf_set_tls_module_base (struct bfd_link_info *info)
50 struct elf_x86_link_hash_table *htab;
51 struct bfd_link_hash_entry *base;
52 const struct elf_backend_data *bed;
54 if (!bfd_link_executable (info))
57 bed = get_elf_backend_data (info->output_bfd);
58 htab = elf_x86_hash_table (info, bed->target_id);
62 base = htab->tls_module_base;
66 base->u.def.value = htab->elf.tls_size;
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. */
74 _bfd_x86_elf_dtpoff_base (struct bfd_link_info *info)
76 /* If tls_sec is NULL, we should have signalled an error already. */
77 if (elf_hash_table (info)->tls_sec == NULL)
79 return elf_hash_table (info)->tls_sec->vma;
82 /* Allocate space in .plt, .got and associated reloc sections for
86 elf_x86_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
88 struct bfd_link_info *info;
89 struct elf_x86_link_hash_table *htab;
90 struct elf_x86_link_hash_entry *eh;
91 struct elf_dyn_relocs *p;
92 unsigned int plt_entry_size;
93 bfd_boolean resolved_to_zero;
94 const struct elf_backend_data *bed;
96 if (h->root.type == bfd_link_hash_indirect)
99 eh = (struct elf_x86_link_hash_entry *) h;
101 info = (struct bfd_link_info *) inf;
102 bed = get_elf_backend_data (info->output_bfd);
103 htab = elf_x86_hash_table (info, bed->target_id);
107 plt_entry_size = htab->plt.plt_entry_size;
109 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
111 /* Clear the reference count of function pointer relocations if
112 symbol isn't a normal function. */
113 if (h->type != STT_FUNC)
114 eh->func_pointer_refcount = 0;
116 /* We can't use the GOT PLT if pointer equality is needed since
117 finish_dynamic_symbol won't clear symbol value and the dynamic
118 linker won't update the GOT slot. We will get into an infinite
120 if (htab->plt_got != NULL
121 && h->type != STT_GNU_IFUNC
122 && !h->pointer_equality_needed
123 && h->plt.refcount > 0
124 && h->got.refcount > 0)
126 /* Don't use the regular PLT if there are both GOT and GOTPLT
128 h->plt.offset = (bfd_vma) -1;
130 /* Use the GOT PLT. */
131 eh->plt_got.refcount = 1;
134 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
135 here if it is defined and referenced in a non-shared object. */
136 if (h->type == STT_GNU_IFUNC
139 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
140 &htab->readonly_dynrelocs_against_ifunc,
144 htab->got_entry_size,
147 asection *s = htab->plt_second;
148 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
150 /* Use the second PLT section if it is created. */
151 eh->plt_second.offset = s->size;
153 /* Make room for this entry in the second PLT section. */
154 s->size += htab->non_lazy_plt->plt_entry_size;
162 /* Don't create the PLT entry if there are only function pointer
163 relocations which can be resolved at run-time. */
164 else if (htab->elf.dynamic_sections_created
165 && (h->plt.refcount > eh->func_pointer_refcount
166 || eh->plt_got.refcount > 0))
168 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
170 /* Clear the reference count of function pointer relocations
172 eh->func_pointer_refcount = 0;
174 /* Make sure this symbol is output as a dynamic symbol.
175 Undefined weak syms won't yet be marked as dynamic. */
179 && h->root.type == bfd_link_hash_undefweak)
181 if (! bfd_elf_link_record_dynamic_symbol (info, h))
185 if (bfd_link_pic (info)
186 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
188 asection *s = htab->elf.splt;
189 asection *second_s = htab->plt_second;
190 asection *got_s = htab->plt_got;
192 /* If this is the first .plt entry, make room for the special
193 first entry. The .plt section is used by prelink to undo
194 prelinking for dynamic relocations. */
196 s->size = htab->plt.has_plt0 * plt_entry_size;
199 eh->plt_got.offset = got_s->size;
202 h->plt.offset = s->size;
204 eh->plt_second.offset = second_s->size;
207 /* If this symbol is not defined in a regular file, and we are
208 not generating a shared library, then set the symbol to this
209 location in the .plt. This is required to make function
210 pointers compare as equal between the normal executable and
211 the shared library. */
212 if (! bfd_link_pic (info)
217 /* We need to make a call to the entry of the GOT PLT
218 instead of regular PLT entry. */
219 h->root.u.def.section = got_s;
220 h->root.u.def.value = eh->plt_got.offset;
226 /* We need to make a call to the entry of the
227 second PLT instead of regular PLT entry. */
228 h->root.u.def.section = second_s;
229 h->root.u.def.value = eh->plt_second.offset;
233 h->root.u.def.section = s;
234 h->root.u.def.value = h->plt.offset;
239 /* Make room for this entry. */
241 got_s->size += htab->non_lazy_plt->plt_entry_size;
244 s->size += plt_entry_size;
246 second_s->size += htab->non_lazy_plt->plt_entry_size;
248 /* We also need to make an entry in the .got.plt section,
249 which will be placed in the .got section by the linker
251 htab->elf.sgotplt->size += htab->got_entry_size;
253 /* There should be no PLT relocation against resolved
254 undefined weak symbol in executable. */
255 if (!resolved_to_zero)
257 /* We also need to make an entry in the .rel.plt
259 htab->elf.srelplt->size += htab->sizeof_reloc;
260 htab->elf.srelplt->reloc_count++;
264 if (htab->is_vxworks && !bfd_link_pic (info))
266 /* VxWorks has a second set of relocations for each PLT entry
267 in executables. They go in a separate relocation section,
268 which is processed by the kernel loader. */
270 /* There are two relocations for the initial PLT entry: an
271 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
272 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
274 asection *srelplt2 = htab->srelplt2;
275 if (h->plt.offset == plt_entry_size)
276 srelplt2->size += (htab->sizeof_reloc * 2);
278 /* There are two extra relocations for each subsequent PLT entry:
279 an R_386_32 relocation for the GOT entry, and an R_386_32
280 relocation for the PLT entry. */
282 srelplt2->size += (htab->sizeof_reloc * 2);
287 eh->plt_got.offset = (bfd_vma) -1;
288 h->plt.offset = (bfd_vma) -1;
294 eh->plt_got.offset = (bfd_vma) -1;
295 h->plt.offset = (bfd_vma) -1;
299 eh->tlsdesc_got = (bfd_vma) -1;
301 /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the
302 binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For
303 x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
304 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
305 if (h->got.refcount > 0
306 && bfd_link_executable (info)
308 && (elf_x86_hash_entry (h)->tls_type & GOT_TLS_IE))
309 h->got.offset = (bfd_vma) -1;
310 else if (h->got.refcount > 0)
314 int tls_type = elf_x86_hash_entry (h)->tls_type;
316 /* Make sure this symbol is output as a dynamic symbol.
317 Undefined weak syms won't yet be marked as dynamic. */
321 && h->root.type == bfd_link_hash_undefweak)
323 if (! bfd_elf_link_record_dynamic_symbol (info, h))
328 if (GOT_TLS_GDESC_P (tls_type))
330 eh->tlsdesc_got = htab->elf.sgotplt->size
331 - elf_x86_compute_jump_table_size (htab);
332 htab->elf.sgotplt->size += 2 * htab->got_entry_size;
333 h->got.offset = (bfd_vma) -2;
335 if (! GOT_TLS_GDESC_P (tls_type)
336 || GOT_TLS_GD_P (tls_type))
338 h->got.offset = s->size;
339 s->size += htab->got_entry_size;
340 /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
342 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
343 s->size += htab->got_entry_size;
345 dyn = htab->elf.dynamic_sections_created;
346 /* R_386_TLS_IE_32 needs one dynamic relocation,
347 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
348 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
349 need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local
350 symbol and two if global. No dynamic relocation against
351 resolved undefined weak symbol in executable. */
352 if (tls_type == GOT_TLS_IE_BOTH)
353 htab->elf.srelgot->size += 2 * htab->sizeof_reloc;
354 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
355 || (tls_type & GOT_TLS_IE))
356 htab->elf.srelgot->size += htab->sizeof_reloc;
357 else if (GOT_TLS_GD_P (tls_type))
358 htab->elf.srelgot->size += 2 * htab->sizeof_reloc;
359 else if (! GOT_TLS_GDESC_P (tls_type)
360 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
361 && !resolved_to_zero)
362 || h->root.type != bfd_link_hash_undefweak)
363 && (bfd_link_pic (info)
364 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
365 htab->elf.srelgot->size += htab->sizeof_reloc;
366 if (GOT_TLS_GDESC_P (tls_type))
368 htab->elf.srelplt->size += htab->sizeof_reloc;
369 if (bed->target_id == X86_64_ELF_DATA)
370 htab->tlsdesc_plt = (bfd_vma) -1;
374 h->got.offset = (bfd_vma) -1;
376 if (eh->dyn_relocs == NULL)
379 /* In the shared -Bsymbolic case, discard space allocated for
380 dynamic pc-relative relocs against symbols which turn out to be
381 defined in regular objects. For the normal shared case, discard
382 space for pc-relative relocs that have become local due to symbol
383 visibility changes. */
385 if (bfd_link_pic (info))
387 /* Relocs that use pc_count are those that appear on a call
388 insn, or certain REL relocs that can generated via assembly.
389 We want calls to protected symbols to resolve directly to the
390 function rather than going via the plt. If people want
391 function pointer comparisons to work as expected then they
392 should avoid writing weird assembly. */
393 if (SYMBOL_CALLS_LOCAL (info, h))
395 struct elf_dyn_relocs **pp;
397 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
399 p->count -= p->pc_count;
408 if (htab->is_vxworks)
410 struct elf_dyn_relocs **pp;
411 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
413 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
420 /* Also discard relocs on undefined weak syms with non-default
421 visibility or in PIE. */
422 if (eh->dyn_relocs != NULL)
424 if (h->root.type == bfd_link_hash_undefweak)
426 /* Undefined weak symbol is never bound locally in shared
428 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
431 if (bed->target_id == I386_ELF_DATA
434 /* Keep dynamic non-GOT/non-PLT relocation so
435 that we can branch to 0 without PLT. */
436 struct elf_dyn_relocs **pp;
438 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
439 if (p->pc_count == 0)
443 /* Remove non-R_386_PC32 relocation. */
444 p->count = p->pc_count;
448 /* Make sure undefined weak symbols are output
449 as dynamic symbols in PIEs for dynamic non-GOT
450 non-PLT reloations. */
451 if (eh->dyn_relocs != NULL
452 && !bfd_elf_link_record_dynamic_symbol (info, h))
456 eh->dyn_relocs = NULL;
458 else if (h->dynindx == -1
460 && !bfd_elf_link_record_dynamic_symbol (info, h))
463 else if (bfd_link_executable (info)
464 && (h->needs_copy || eh->needs_copy)
468 /* NB: needs_copy is set only for x86-64. For PIE,
469 discard space for pc-relative relocs against symbols
470 which turn out to need copy relocs. */
471 struct elf_dyn_relocs **pp;
473 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
475 if (p->pc_count != 0)
483 else if (ELIMINATE_COPY_RELOCS)
485 /* For the non-shared case, discard space for relocs against
486 symbols which turn out to need copy relocs or are not
487 dynamic. Keep dynamic relocations for run-time function
488 pointer initialization. */
491 || eh->func_pointer_refcount > 0
492 || (h->root.type == bfd_link_hash_undefweak
493 && !resolved_to_zero))
496 || (htab->elf.dynamic_sections_created
497 && (h->root.type == bfd_link_hash_undefweak
498 || h->root.type == bfd_link_hash_undefined))))
500 /* Make sure this symbol is output as a dynamic symbol.
501 Undefined weak syms won't yet be marked as dynamic. */
505 && h->root.type == bfd_link_hash_undefweak
506 && ! bfd_elf_link_record_dynamic_symbol (info, h))
509 /* If that succeeded, we know we'll be keeping all the
511 if (h->dynindx != -1)
515 eh->dyn_relocs = NULL;
516 eh->func_pointer_refcount = 0;
521 /* Finally, allocate space. */
522 for (p = eh->dyn_relocs; p != NULL; p = p->next)
526 sreloc = elf_section_data (p->sec)->sreloc;
528 BFD_ASSERT (sreloc != NULL);
529 sreloc->size += p->count * htab->sizeof_reloc;
535 /* Find any dynamic relocs that apply to read-only sections. */
538 _bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry *h,
541 struct elf_x86_link_hash_entry *eh;
542 struct elf_dyn_relocs *p;
544 /* Skip local IFUNC symbols. */
545 if (h->forced_local && h->type == STT_GNU_IFUNC)
548 eh = (struct elf_x86_link_hash_entry *) h;
549 for (p = eh->dyn_relocs; p != NULL; p = p->next)
551 asection *s = p->sec->output_section;
553 if (s != NULL && (s->flags & SEC_READONLY) != 0)
555 struct bfd_link_info *info = (struct bfd_link_info *) inf;
557 info->flags |= DF_TEXTREL;
559 if ((info->warn_shared_textrel && bfd_link_pic (info))
560 || info->error_textrel)
561 /* xgettext:c-format */
562 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
563 p->sec->owner, h->root.root.string,
566 /* Not an error, just cut short the traversal. */
573 /* Allocate space in .plt, .got and associated reloc sections for
574 local dynamic relocs. */
577 elf_x86_allocate_local_dynreloc (void **slot, void *inf)
579 struct elf_link_hash_entry *h
580 = (struct elf_link_hash_entry *) *slot;
582 if (h->type != STT_GNU_IFUNC
586 || h->root.type != bfd_link_hash_defined)
589 return elf_x86_allocate_dynrelocs (h, inf);
592 /* Find and/or create a hash entry for local symbol. */
594 struct elf_link_hash_entry *
595 _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab,
596 bfd *abfd, const Elf_Internal_Rela *rel,
599 struct elf_x86_link_hash_entry e, *ret;
600 asection *sec = abfd->sections;
601 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
602 htab->r_sym (rel->r_info));
605 e.elf.indx = sec->id;
606 e.elf.dynstr_index = htab->r_sym (rel->r_info);
607 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
608 create ? INSERT : NO_INSERT);
615 ret = (struct elf_x86_link_hash_entry *) *slot;
619 ret = (struct elf_x86_link_hash_entry *)
620 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
621 sizeof (struct elf_x86_link_hash_entry));
624 memset (ret, 0, sizeof (*ret));
625 ret->elf.indx = sec->id;
626 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
627 ret->elf.dynindx = -1;
628 ret->plt_got.offset = (bfd_vma) -1;
634 /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN
635 SYNC WITH _bfd_elf_link_hash_newfunc. */
637 struct bfd_hash_entry *
638 _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
639 struct bfd_hash_table *table,
642 /* Allocate the structure if it has not already been allocated by a
646 entry = (struct bfd_hash_entry *)
647 bfd_hash_allocate (table,
648 sizeof (struct elf_x86_link_hash_entry));
653 /* Call the allocation method of the superclass. */
654 entry = _bfd_link_hash_newfunc (entry, table, string);
657 struct elf_x86_link_hash_entry *eh
658 = (struct elf_x86_link_hash_entry *) entry;
659 struct elf_link_hash_table *htab
660 = (struct elf_link_hash_table *) table;
662 memset (&eh->elf.size, 0,
663 (sizeof (struct elf_x86_link_hash_entry)
664 - offsetof (struct elf_link_hash_entry, size)));
665 /* Set local fields. */
667 eh->elf.dynindx = -1;
668 eh->elf.got = htab->init_got_refcount;
669 eh->elf.plt = htab->init_plt_refcount;
670 /* Assume that we have been called by a non-ELF symbol reader.
671 This flag is then reset by the code which reads an ELF input
672 file. This ensures that a symbol created by a non-ELF symbol
673 reader will have the flag set correctly. */
675 eh->plt_second.offset = (bfd_vma) -1;
676 eh->plt_got.offset = (bfd_vma) -1;
677 eh->tlsdesc_got = (bfd_vma) -1;
678 eh->zero_undefweak = 1;
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. */
690 _bfd_x86_elf_local_htab_hash (const void *ptr)
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);
697 /* Compare local hash entries. */
700 _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2)
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;
707 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
710 /* Destroy an x86 ELF linker hash table. */
713 elf_x86_link_hash_table_free (bfd *obfd)
715 struct elf_x86_link_hash_table *htab
716 = (struct elf_x86_link_hash_table *) obfd->link.hash;
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);
726 elf_i386_is_reloc_section (const char *secname)
728 return CONST_STRNEQ (secname, ".rel");
732 elf_x86_64_is_reloc_section (const char *secname)
734 return CONST_STRNEQ (secname, ".rela");
737 /* Create an x86 ELF linker hash table. */
739 struct bfd_link_hash_table *
740 _bfd_x86_elf_link_hash_table_create (bfd *abfd)
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);
746 ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt);
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),
760 if (bed->target_id == X86_64_ELF_DATA)
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;
767 ret->tls_get_addr = "__tls_get_addr";
771 ret->sizeof_reloc = sizeof (Elf64_External_Rela);
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;
778 if (bed->target_id == X86_64_ELF_DATA)
780 ret->sizeof_reloc = sizeof (Elf32_External_Rela);
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;
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;
792 ret->sizeof_reloc = sizeof (Elf32_External_Rel);
793 ret->got_entry_size = 4;
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";
801 ret->target_id = bed->target_id;
803 ret->loc_hash_table = htab_try_create (1024,
804 _bfd_x86_elf_local_htab_hash,
805 _bfd_x86_elf_local_htab_eq,
807 ret->loc_hash_memory = objalloc_create ();
808 if (!ret->loc_hash_table || !ret->loc_hash_memory)
810 elf_x86_link_hash_table_free (abfd);
813 ret->elf.root.hash_table_free = elf_x86_link_hash_table_free;
815 return &ret->elf.root;
818 /* Sort relocs into address order. */
821 _bfd_x86_elf_compare_relocs (const void *ap, const void *bp)
823 const arelent *a = * (const arelent **) ap;
824 const arelent *b = * (const arelent **) bp;
826 if (a->address > b->address)
828 else if (a->address < b->address)
835 _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
837 if (!bfd_link_relocatable (info))
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);
845 struct elf_link_hash_entry *h;
847 h = elf_link_hash_lookup (elf_hash_table (info),
849 FALSE, FALSE, FALSE);
851 elf_x86_hash_entry (h)->tls_get_addr = 1;
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),
857 FALSE, FALSE, FALSE);
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))
864 elf_x86_hash_entry (h)->local_ref = 2;
865 elf_x86_hash_entry (h)->linker_def = 1;
870 /* Invoke the regular ELF backend linker to do all the work. */
871 return _bfd_elf_link_check_relocs (abfd, info);
874 /* Set the sizes of the dynamic sections. */
877 _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
878 struct bfd_link_info *info)
880 struct elf_x86_link_hash_table *htab;
885 const struct elf_backend_data *bed
886 = get_elf_backend_data (output_bfd);
888 htab = elf_x86_hash_table (info, bed->target_id);
891 dynobj = htab->elf.dynobj;
895 /* Set up .got offsets for local syms, and space for local dynamic
897 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
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;
907 if (! is_x86_elf (ibfd, htab))
910 for (s = ibfd->sections; s != NULL; s = s->next)
912 struct elf_dyn_relocs *p;
914 for (p = ((struct elf_dyn_relocs *)
915 elf_section_data (s)->local_dynrel);
919 if (!bfd_is_abs_section (p->sec)
920 && bfd_is_abs_section (p->sec->output_section))
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
927 else if (htab->is_vxworks
928 && strcmp (p->sec->output_section->name,
931 /* Relocations in vxworks .tls_vars sections are
932 handled specially by the loader. */
934 else if (p->count != 0)
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)
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);
952 local_got = elf_local_got_refcounts (ibfd);
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);
962 srel = htab->elf.srelgot;
963 for (; local_got < end_local_got;
964 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
966 *local_tlsdesc_gotent = (bfd_vma) -1;
969 if (GOT_TLS_GDESC_P (*local_tls_type))
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;
976 if (! GOT_TLS_GDESC_P (*local_tls_type)
977 || GOT_TLS_GD_P (*local_tls_type))
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;
985 if (bfd_link_pic (info)
986 || GOT_TLS_GD_ANY_P (*local_tls_type)
987 || (*local_tls_type & GOT_TLS_IE))
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))
996 htab->elf.srelplt->size += htab->sizeof_reloc;
997 if (bed->target_id == X86_64_ELF_DATA)
998 htab->tlsdesc_plt = (bfd_vma) -1;
1003 *local_got = (bfd_vma) -1;
1007 if (htab->tls_ld_or_ldm_got.refcount > 0)
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;
1016 htab->tls_ld_or_ldm_got.offset = -1;
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,
1023 /* Allocate .plt and .got entries, and space for local symbols. */
1024 htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc,
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
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)
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;
1042 else if (htab->elf.irelplt)
1043 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
1045 if (htab->tlsdesc_plt)
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
1050 if ((info->flags & DF_BIND_NOW))
1051 htab->tlsdesc_plt = 0;
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;
1065 if (htab->elf.sgotplt)
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;
1083 if (_bfd_elf_eh_frame_present (info))
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;
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;
1098 /* Unwind info for the second PLT and .plt.got sections are
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;
1108 /* We now have determined the sizes of the various dynamic sections.
1109 Allocate memory for them. */
1111 for (s = dynobj->sections; s != NULL; s = s->next)
1113 bfd_boolean strip_section = TRUE;
1115 if ((s->flags & SEC_LINKER_CREATED) == 0)
1118 if (s == htab->elf.splt
1119 || s == htab->elf.sgot)
1121 /* Strip this section if we don't need it; see the
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. */
1127 if (htab->elf.hplt != NULL)
1128 strip_section = FALSE;
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)
1141 /* Strip these too. */
1143 else if (htab->is_reloc_section (bfd_get_section_name (dynobj, s)))
1146 && s != htab->elf.srelplt
1147 && s != htab->srelplt2)
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)
1157 /* It's not one of our sections, so don't allocate space. */
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. */
1173 s->flags |= SEC_EXCLUDE;
1177 if ((s->flags & SEC_HAS_CONTENTS) == 0)
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)
1190 if (htab->plt_eh_frame != NULL
1191 && htab->plt_eh_frame->contents != NULL)
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);
1200 if (htab->plt_got_eh_frame != NULL
1201 && htab->plt_got_eh_frame->contents != NULL)
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));
1211 if (htab->plt_second_eh_frame != NULL
1212 && htab->plt_second_eh_frame->contents != NULL)
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));
1222 if (htab->elf.dynamic_sections_created)
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)
1232 if (bfd_link_executable (info))
1234 if (!add_dynamic_entry (DT_DEBUG, 0))
1238 if (htab->elf.splt->size != 0)
1240 /* DT_PLTGOT is used by prelink even if there is no PLT
1242 if (!add_dynamic_entry (DT_PLTGOT, 0))
1246 if (htab->elf.srelplt->size != 0)
1248 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1249 || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc)
1250 || !add_dynamic_entry (DT_JMPREL, 0))
1254 if (htab->tlsdesc_plt
1255 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
1256 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
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))
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,
1274 if ((info->flags & DF_TEXTREL) != 0)
1276 if (htab->readonly_dynrelocs_against_ifunc)
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);
1284 if (!add_dynamic_entry (DT_TEXTREL, 0))
1288 if (htab->is_vxworks
1289 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
1292 #undef add_dynamic_entry
1297 /* Finish up the x86 dynamic sections. */
1299 struct elf_x86_link_hash_table *
1300 _bfd_x86_elf_finish_dynamic_sections (bfd *output_bfd,
1301 struct bfd_link_info *info)
1303 struct elf_x86_link_hash_table *htab;
1304 const struct elf_backend_data *bed;
1307 bfd_byte *dyncon, *dynconend;
1308 bfd_size_type sizeof_dyn;
1310 bed = get_elf_backend_data (output_bfd);
1311 htab = elf_x86_hash_table (info, bed->target_id);
1315 dynobj = htab->elf.dynobj;
1316 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1318 /* GOT is always created in setup_gnu_properties. But it may not be
1319 needed. .got.plt section may be needed for static IFUNC. */
1320 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
1322 bfd_vma dynamic_addr;
1324 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
1327 (_("discarded output section: `%A'"), htab->elf.sgotplt);
1331 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
1332 = htab->got_entry_size;
1334 dynamic_addr = (sdyn == NULL
1336 : sdyn->output_section->vma + sdyn->output_offset);
1338 /* Set the first entry in the global offset table to the address
1339 of the dynamic section. Write GOT[1] and GOT[2], needed for
1340 the dynamic linker. */
1341 if (htab->got_entry_size == 8)
1343 bfd_put_64 (output_bfd, dynamic_addr,
1344 htab->elf.sgotplt->contents);
1345 bfd_put_64 (output_bfd, (bfd_vma) 0,
1346 htab->elf.sgotplt->contents + 8);
1347 bfd_put_64 (output_bfd, (bfd_vma) 0,
1348 htab->elf.sgotplt->contents + 8*2);
1352 bfd_put_32 (output_bfd, dynamic_addr,
1353 htab->elf.sgotplt->contents);
1354 bfd_put_32 (output_bfd, 0,
1355 htab->elf.sgotplt->contents + 4);
1356 bfd_put_32 (output_bfd, 0,
1357 htab->elf.sgotplt->contents + 4*2);
1361 if (!htab->elf.dynamic_sections_created)
1364 if (sdyn == NULL || htab->elf.sgot == NULL)
1367 sizeof_dyn = bed->s->sizeof_dyn;
1368 dyncon = sdyn->contents;
1369 dynconend = sdyn->contents + sdyn->size;
1370 for (; dyncon < dynconend; dyncon += sizeof_dyn)
1372 Elf_Internal_Dyn dyn;
1375 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
1380 if (htab->is_vxworks
1381 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
1386 s = htab->elf.sgotplt;
1387 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1391 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
1395 s = htab->elf.srelplt->output_section;
1396 dyn.d_un.d_val = s->size;
1399 case DT_TLSDESC_PLT:
1401 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
1402 + htab->tlsdesc_plt;
1405 case DT_TLSDESC_GOT:
1407 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
1408 + htab->tlsdesc_got;
1412 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
1415 if (htab->plt_got != NULL && htab->plt_got->size > 0)
1416 elf_section_data (htab->plt_got->output_section)
1417 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
1419 if (htab->plt_second != NULL && htab->plt_second->size > 0)
1420 elf_section_data (htab->plt_second->output_section)
1421 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
1423 /* Adjust .eh_frame for .plt section. */
1424 if (htab->plt_eh_frame != NULL
1425 && htab->plt_eh_frame->contents != NULL)
1427 if (htab->elf.splt != NULL
1428 && htab->elf.splt->size != 0
1429 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
1430 && htab->elf.splt->output_section != NULL
1431 && htab->plt_eh_frame->output_section != NULL)
1433 bfd_vma plt_start = htab->elf.splt->output_section->vma;
1434 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
1435 + htab->plt_eh_frame->output_offset
1436 + PLT_FDE_START_OFFSET;
1437 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1438 htab->plt_eh_frame->contents
1439 + PLT_FDE_START_OFFSET);
1442 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
1444 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1446 htab->plt_eh_frame->contents))
1451 /* Adjust .eh_frame for .plt.got section. */
1452 if (htab->plt_got_eh_frame != NULL
1453 && htab->plt_got_eh_frame->contents != NULL)
1455 if (htab->plt_got != NULL
1456 && htab->plt_got->size != 0
1457 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
1458 && htab->plt_got->output_section != NULL
1459 && htab->plt_got_eh_frame->output_section != NULL)
1461 bfd_vma plt_start = htab->plt_got->output_section->vma;
1462 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
1463 + htab->plt_got_eh_frame->output_offset
1464 + PLT_FDE_START_OFFSET;
1465 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1466 htab->plt_got_eh_frame->contents
1467 + PLT_FDE_START_OFFSET);
1469 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
1471 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1472 htab->plt_got_eh_frame,
1473 htab->plt_got_eh_frame->contents))
1478 /* Adjust .eh_frame for the second PLT section. */
1479 if (htab->plt_second_eh_frame != NULL
1480 && htab->plt_second_eh_frame->contents != NULL)
1482 if (htab->plt_second != NULL
1483 && htab->plt_second->size != 0
1484 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
1485 && htab->plt_second->output_section != NULL
1486 && htab->plt_second_eh_frame->output_section != NULL)
1488 bfd_vma plt_start = htab->plt_second->output_section->vma;
1489 bfd_vma eh_frame_start
1490 = (htab->plt_second_eh_frame->output_section->vma
1491 + htab->plt_second_eh_frame->output_offset
1492 + PLT_FDE_START_OFFSET);
1493 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1494 htab->plt_second_eh_frame->contents
1495 + PLT_FDE_START_OFFSET);
1497 if (htab->plt_second_eh_frame->sec_info_type
1498 == SEC_INFO_TYPE_EH_FRAME)
1500 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1501 htab->plt_second_eh_frame,
1502 htab->plt_second_eh_frame->contents))
1507 if (htab->elf.sgot && htab->elf.sgot->size > 0)
1508 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
1509 = htab->got_entry_size;
1516 _bfd_x86_elf_always_size_sections (bfd *output_bfd,
1517 struct bfd_link_info *info)
1519 asection *tls_sec = elf_hash_table (info)->tls_sec;
1523 struct elf_link_hash_entry *tlsbase;
1525 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
1526 "_TLS_MODULE_BASE_",
1527 FALSE, FALSE, FALSE);
1529 if (tlsbase && tlsbase->type == STT_TLS)
1531 struct elf_x86_link_hash_table *htab;
1532 struct bfd_link_hash_entry *bh = NULL;
1533 const struct elf_backend_data *bed
1534 = get_elf_backend_data (output_bfd);
1536 htab = elf_x86_hash_table (info, bed->target_id);
1540 if (!(_bfd_generic_link_add_one_symbol
1541 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
1542 tls_sec, 0, NULL, FALSE,
1543 bed->collect, &bh)))
1546 htab->tls_module_base = bh;
1548 tlsbase = (struct elf_link_hash_entry *)bh;
1549 tlsbase->def_regular = 1;
1550 tlsbase->other = STV_HIDDEN;
1551 tlsbase->root.linker_def = 1;
1552 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
1560 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h,
1561 const Elf_Internal_Sym *isym,
1562 bfd_boolean definition,
1563 bfd_boolean dynamic ATTRIBUTE_UNUSED)
1567 struct elf_x86_link_hash_entry *eh
1568 = (struct elf_x86_link_hash_entry *) h;
1569 eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other)
1574 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1577 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info,
1578 struct elf_link_hash_entry *dir,
1579 struct elf_link_hash_entry *ind)
1581 struct elf_x86_link_hash_entry *edir, *eind;
1583 edir = (struct elf_x86_link_hash_entry *) dir;
1584 eind = (struct elf_x86_link_hash_entry *) ind;
1586 if (eind->dyn_relocs != NULL)
1588 if (edir->dyn_relocs != NULL)
1590 struct elf_dyn_relocs **pp;
1591 struct elf_dyn_relocs *p;
1593 /* Add reloc counts against the indirect sym to the direct sym
1594 list. Merge any entries against the same section. */
1595 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1597 struct elf_dyn_relocs *q;
1599 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1600 if (q->sec == p->sec)
1602 q->pc_count += p->pc_count;
1603 q->count += p->count;
1610 *pp = edir->dyn_relocs;
1613 edir->dyn_relocs = eind->dyn_relocs;
1614 eind->dyn_relocs = NULL;
1617 if (ind->root.type == bfd_link_hash_indirect
1618 && dir->got.refcount <= 0)
1620 edir->tls_type = eind->tls_type;
1621 eind->tls_type = GOT_UNKNOWN;
1624 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1625 generate a R_386_COPY reloc. */
1626 edir->gotoff_ref |= eind->gotoff_ref;
1628 edir->zero_undefweak |= eind->zero_undefweak;
1630 if (ELIMINATE_COPY_RELOCS
1631 && ind->root.type != bfd_link_hash_indirect
1632 && dir->dynamic_adjusted)
1634 /* If called to transfer flags for a weakdef during processing
1635 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1636 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1637 if (dir->versioned != versioned_hidden)
1638 dir->ref_dynamic |= ind->ref_dynamic;
1639 dir->ref_regular |= ind->ref_regular;
1640 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1641 dir->needs_plt |= ind->needs_plt;
1642 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1646 if (eind->func_pointer_refcount > 0)
1648 edir->func_pointer_refcount += eind->func_pointer_refcount;
1649 eind->func_pointer_refcount = 0;
1652 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1656 /* Remove undefined weak symbol from the dynamic symbol table if it
1657 is resolved to 0. */
1660 _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info,
1661 struct elf_link_hash_entry *h)
1663 if (h->dynindx != -1
1664 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, elf_x86_hash_entry (h)))
1667 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
1673 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1676 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h)
1678 if (h->plt.offset != (bfd_vma) -1
1680 && !h->pointer_equality_needed)
1683 return _bfd_elf_hash_symbol (h);
1686 /* Adjust a symbol defined by a dynamic object and referenced by a
1687 regular object. The current definition is in some section of the
1688 dynamic object, but we're not including those sections. We have to
1689 change the definition to something the rest of the link can
1693 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
1694 struct elf_link_hash_entry *h)
1696 struct elf_x86_link_hash_table *htab;
1698 struct elf_x86_link_hash_entry *eh;
1699 struct elf_dyn_relocs *p;
1700 const struct elf_backend_data *bed
1701 = get_elf_backend_data (info->output_bfd);
1703 /* STT_GNU_IFUNC symbol must go through PLT. */
1704 if (h->type == STT_GNU_IFUNC)
1706 /* All local STT_GNU_IFUNC references must be treate as local
1707 calls via local PLT. */
1709 && SYMBOL_CALLS_LOCAL (info, h))
1711 bfd_size_type pc_count = 0, count = 0;
1712 struct elf_dyn_relocs **pp;
1714 eh = (struct elf_x86_link_hash_entry *) h;
1715 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1717 pc_count += p->pc_count;
1718 p->count -= p->pc_count;
1727 if (pc_count || count)
1732 /* Increment PLT reference count only for PC-relative
1735 if (h->plt.refcount <= 0)
1736 h->plt.refcount = 1;
1738 h->plt.refcount += 1;
1743 if (h->plt.refcount <= 0)
1745 h->plt.offset = (bfd_vma) -1;
1751 /* If this is a function, put it in the procedure linkage table. We
1752 will fill in the contents of the procedure linkage table later,
1753 when we know the address of the .got section. */
1754 if (h->type == STT_FUNC
1757 if (h->plt.refcount <= 0
1758 || SYMBOL_CALLS_LOCAL (info, h)
1759 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1760 && h->root.type == bfd_link_hash_undefweak))
1762 /* This case can occur if we saw a PLT32 reloc in an input
1763 file, but the symbol was never referred to by a dynamic
1764 object, or if all references were garbage collected. In
1765 such a case, we don't actually need to build a procedure
1766 linkage table, and we can just do a PC32 reloc instead. */
1767 h->plt.offset = (bfd_vma) -1;
1774 /* It's possible that we incorrectly decided a .plt reloc was needed
1775 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1776 check_relocs. We can't decide accurately between function and
1777 non-function syms in check-relocs; Objects loaded later in
1778 the link may change h->type. So fix it now. */
1779 h->plt.offset = (bfd_vma) -1;
1781 eh = (struct elf_x86_link_hash_entry *) h;
1783 /* If this is a weak symbol, and there is a real definition, the
1784 processor independent code will have arranged for us to see the
1785 real definition first, and we can just use the same value. */
1786 if (h->u.weakdef != NULL)
1788 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1789 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1790 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1791 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1792 if (ELIMINATE_COPY_RELOCS
1793 || info->nocopyreloc
1794 || SYMBOL_NO_COPYRELOC (info, eh))
1796 /* NB: needs_copy is always 0 for i386. */
1797 h->non_got_ref = h->u.weakdef->non_got_ref;
1798 eh->needs_copy = h->u.weakdef->needs_copy;
1803 /* This is a reference to a symbol defined by a dynamic object which
1804 is not a function. */
1806 /* If we are creating a shared library, we must presume that the
1807 only references to the symbol are via the global offset table.
1808 For such cases we need not do anything here; the relocations will
1809 be handled correctly by relocate_section. */
1810 if (!bfd_link_executable (info))
1813 /* If there are no references to this symbol that do not use the
1814 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1815 reloc. NB: gotoff_ref is always 0 for x86-64. */
1816 if (!h->non_got_ref && !eh->gotoff_ref)
1819 /* If -z nocopyreloc was given, we won't generate them either. */
1820 if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh))
1826 htab = elf_x86_hash_table (info, bed->target_id);
1830 /* If there aren't any dynamic relocs in read-only sections nor
1831 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1832 avoid the copy reloc. This doesn't work on VxWorks, where we can
1833 not have dynamic relocations (other than copy and jump slot
1834 relocations) in an executable. */
1835 if (ELIMINATE_COPY_RELOCS
1836 && (bed->target_id == X86_64_ELF_DATA
1838 && !htab->is_vxworks)))
1840 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1842 s = p->sec->output_section;
1843 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1847 /* If we didn't find any dynamic relocs in read-only sections,
1848 then we'll be keeping the dynamic relocs and avoiding the copy
1857 /* We must allocate the symbol in our .dynbss section, which will
1858 become part of the .bss section of the executable. There will be
1859 an entry for this symbol in the .dynsym section. The dynamic
1860 object will contain position independent code, so all references
1861 from the dynamic object to this symbol will go through the global
1862 offset table. The dynamic linker will use the .dynsym entry to
1863 determine the address it must put in the global offset table, so
1864 both the dynamic object and the regular object will refer to the
1865 same memory location for the variable. */
1867 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1868 dynamic linker to copy the initial value out of the dynamic object
1869 and into the runtime process image. */
1870 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1872 s = htab->elf.sdynrelro;
1873 srel = htab->elf.sreldynrelro;
1877 s = htab->elf.sdynbss;
1878 srel = htab->elf.srelbss;
1880 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1882 srel->size += htab->sizeof_reloc;
1886 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1890 _bfd_x86_elf_hide_symbol (struct bfd_link_info *info,
1891 struct elf_link_hash_entry *h,
1892 bfd_boolean force_local)
1894 if (h->root.type == bfd_link_hash_undefweak
1896 && bfd_link_pie (info))
1898 /* When there is no dynamic interpreter in PIE, make the undefined
1899 weak symbol dynamic so that PC relative branch to the undefined
1900 weak symbol will land to address 0. */
1901 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1902 if (h->plt.refcount > eh->func_pointer_refcount
1903 || eh->plt_got.refcount > 0)
1907 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
1910 /* Return TRUE if a symbol is referenced locally. It is similar to
1911 SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
1912 works in check_relocs. */
1915 _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info,
1916 struct elf_link_hash_entry *h)
1918 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1919 struct elf_x86_link_hash_table *htab
1920 = (struct elf_x86_link_hash_table *) info->hash;
1922 if (eh->local_ref > 1)
1925 if (eh->local_ref == 1)
1928 /* Unversioned symbols defined in regular objects can be forced local
1929 by linker version script. A weak undefined symbol is forced local
1931 1. It has non-default visibility. Or
1932 2. When building executable, there is no dynamic linker. Or
1933 3. or "-z nodynamic-undefined-weak" is used.
1935 if (SYMBOL_REFERENCES_LOCAL (info, h)
1936 || (h->root.type == bfd_link_hash_undefweak
1937 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1938 || (bfd_link_executable (info)
1939 && htab->interp == NULL)
1940 || info->dynamic_undefined_weak == 0))
1941 || ((h->def_regular || ELF_COMMON_DEF_P (h))
1942 && h->versioned == unversioned
1943 && info->version_info != NULL
1944 && bfd_hide_sym_by_version (info->version_info,
1945 h->root.root.string)))
1955 /* Return the section that should be marked against GC for a given
1959 _bfd_x86_elf_gc_mark_hook (asection *sec,
1960 struct bfd_link_info *info,
1961 Elf_Internal_Rela *rel,
1962 struct elf_link_hash_entry *h,
1963 Elf_Internal_Sym *sym)
1965 /* Compiler should optimize this out. */
1966 if (((unsigned int) R_X86_64_GNU_VTINHERIT
1967 != (unsigned int) R_386_GNU_VTINHERIT)
1968 || ((unsigned int) R_X86_64_GNU_VTENTRY
1969 != (unsigned int) R_386_GNU_VTENTRY))
1973 switch (ELF32_R_TYPE (rel->r_info))
1975 case R_X86_64_GNU_VTINHERIT:
1976 case R_X86_64_GNU_VTENTRY:
1980 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1984 elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED,
1986 bfd_vma offset ATTRIBUTE_UNUSED,
1989 return got_addr + off;
1993 elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p,
1996 bfd_vma got_addr ATTRIBUTE_UNUSED)
1998 return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size;
2002 elf_i386_valid_plt_reloc_p (unsigned int type)
2004 return (type == R_386_JUMP_SLOT
2005 || type == R_386_GLOB_DAT
2006 || type == R_386_IRELATIVE);
2010 elf_x86_64_valid_plt_reloc_p (unsigned int type)
2012 return (type == R_X86_64_JUMP_SLOT
2013 || type == R_X86_64_GLOB_DAT
2014 || type == R_X86_64_IRELATIVE);
2018 _bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
2022 struct elf_x86_plt plts[],
2026 long size, i, n, len;
2028 unsigned int plt_got_offset, plt_entry_size;
2030 bfd_byte *plt_contents;
2032 arelent **dynrelbuf, *p;
2034 const struct elf_backend_data *bed;
2035 bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma,
2037 bfd_boolean (*valid_plt_reloc_p) (unsigned int);
2042 dynrelbuf = (arelent **) bfd_malloc (relsize);
2043 if (dynrelbuf == NULL)
2046 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
2048 if (dynrelcount <= 0)
2051 /* Sort the relocs by address. */
2052 qsort (dynrelbuf, dynrelcount, sizeof (arelent *),
2053 _bfd_x86_elf_compare_relocs);
2055 size = count * sizeof (asymbol);
2057 /* Allocate space for @plt suffixes. */
2059 for (i = 0; i < dynrelcount; i++)
2062 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
2064 size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
2067 s = *ret = (asymbol *) bfd_zmalloc (size);
2071 bed = get_elf_backend_data (abfd);
2073 if (bed->target_id == X86_64_ELF_DATA)
2075 get_plt_got_vma = elf_x86_64_get_plt_got_vma;
2076 valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p;
2080 get_plt_got_vma = elf_i386_get_plt_got_vma;
2081 valid_plt_reloc_p = elf_i386_valid_plt_reloc_p;
2084 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
2086 asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
2088 got_addr = sec->vma;
2091 sec = bfd_get_section_by_name (abfd, ".got");
2093 got_addr = sec->vma;
2096 if (got_addr == (bfd_vma) -1)
2101 /* Check for each PLT section. */
2102 names = (char *) (s + count);
2105 for (j = 0; plts[j].name != NULL; j++)
2106 if ((plt_contents = plts[j].contents) != NULL)
2111 struct elf_x86_plt *plt_p = &plts[j];
2113 plt_got_offset = plt_p->plt_got_offset;
2114 plt_entry_size = plt_p->plt_entry_size;
2118 if ((plt_p->type & plt_lazy))
2120 /* Skip PLT0 in lazy PLT. */
2122 offset = plt_entry_size;
2130 /* Check each PLT entry against dynamic relocations. */
2131 for (; k < plt_p->count; k++)
2137 /* Get the GOT offset for i386 or the PC-relative offset
2138 for x86-64, a signed 32-bit integer. */
2139 off = H_GET_32 (abfd, (plt_contents + offset
2141 got_vma = get_plt_got_vma (plt_p, off, offset, got_addr);
2143 /* Binary search. */
2147 while ((min + 1) < max)
2151 mid = (min + max) / 2;
2153 if (got_vma > r->address)
2155 else if (got_vma < r->address)
2164 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
2165 if (got_vma == p->address
2167 && valid_plt_reloc_p (p->howto->type))
2169 *s = **p->sym_ptr_ptr;
2170 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
2171 set. Since we are defining a symbol, ensure one
2173 if ((s->flags & BSF_LOCAL) == 0)
2174 s->flags |= BSF_GLOBAL;
2175 s->flags |= BSF_SYNTHETIC;
2176 /* This is no longer a section symbol. */
2177 s->flags &= ~BSF_SECTION_SYM;
2179 s->the_bfd = plt->owner;
2183 len = strlen ((*p->sym_ptr_ptr)->name);
2184 memcpy (names, (*p->sym_ptr_ptr)->name, len);
2190 memcpy (names, "+0x", sizeof ("+0x") - 1);
2191 names += sizeof ("+0x") - 1;
2192 bfd_sprintf_vma (abfd, buf, p->addend);
2193 for (a = buf; *a == '0'; ++a)
2196 memcpy (names, a, size);
2199 memcpy (names, "@plt", sizeof ("@plt"));
2200 names += sizeof ("@plt");
2203 /* There should be only one entry in PLT for a given
2204 symbol. Set howto to NULL after processing a PLT
2205 entry to guard against corrupted PLT. */
2208 offset += plt_entry_size;
2212 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
2221 for (j = 0; plts[j].name != NULL; j++)
2222 if (plts[j].contents != NULL)
2223 free (plts[j].contents);
2230 /* Parse x86 GNU properties. */
2232 enum elf_property_kind
2233 _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type,
2234 bfd_byte *ptr, unsigned int datasz)
2240 case GNU_PROPERTY_X86_ISA_1_USED:
2241 case GNU_PROPERTY_X86_ISA_1_NEEDED:
2242 case GNU_PROPERTY_X86_FEATURE_1_AND:
2246 ((type == GNU_PROPERTY_X86_ISA_1_USED
2247 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
2248 : (type == GNU_PROPERTY_X86_ISA_1_NEEDED
2249 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
2250 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
2252 return property_corrupt;
2254 prop = _bfd_elf_get_property (abfd, type, datasz);
2255 /* Combine properties of the same type. */
2256 prop->u.number |= bfd_h_get_32 (abfd, ptr);
2257 prop->pr_kind = property_number;
2261 return property_ignored;
2264 return property_number;
2267 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
2268 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
2269 should be merged with ABFD. */
2272 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info,
2273 bfd *abfd ATTRIBUTE_UNUSED,
2274 elf_property *aprop,
2275 elf_property *bprop)
2277 unsigned int number, features;
2278 bfd_boolean updated = FALSE;
2279 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
2283 case GNU_PROPERTY_X86_ISA_1_USED:
2284 case GNU_PROPERTY_X86_ISA_1_NEEDED:
2285 if (aprop != NULL && bprop != NULL)
2287 number = aprop->u.number;
2288 aprop->u.number = number | bprop->u.number;
2289 updated = number != (unsigned int) aprop->u.number;
2293 /* Return TRUE if APROP is NULL to indicate that BPROP should
2294 be added to ABFD. */
2295 updated = aprop == NULL;
2299 case GNU_PROPERTY_X86_FEATURE_1_AND:
2300 /* Only one of APROP and BPROP can be NULL:
2301 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2302 2. If APROP is NULL, remove x86 feature.
2303 3. Otherwise, do nothing.
2305 if (aprop != NULL && bprop != NULL)
2309 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2311 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2312 number = aprop->u.number;
2313 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2314 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2315 aprop->u.number = (number & bprop->u.number) | features;
2316 updated = number != (unsigned int) aprop->u.number;
2317 /* Remove the property if all feature bits are cleared. */
2318 if (aprop->u.number == 0)
2319 aprop->pr_kind = property_remove;
2325 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2327 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2330 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2331 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2334 number = aprop->u.number;
2335 aprop->u.number = number | features;
2336 updated = number != (unsigned int) aprop->u.number;
2340 bprop->u.number |= features;
2344 else if (aprop != NULL)
2346 aprop->pr_kind = property_remove;
2353 /* Never should happen. */
2360 /* Set up x86 GNU properties. Return the first relocatable ELF input
2361 with GNU properties if found. Otherwise, return NULL. */
2364 _bfd_x86_elf_link_setup_gnu_properties
2365 (struct bfd_link_info *info, struct elf_x86_init_table *init_table)
2367 bfd_boolean normal_target;
2368 bfd_boolean lazy_plt;
2369 asection *sec, *pltsec;
2371 bfd_boolean use_ibt_plt;
2372 unsigned int plt_alignment, features;
2373 struct elf_x86_link_hash_table *htab;
2377 const struct elf_backend_data *bed;
2378 unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2;
2379 unsigned int got_align;
2383 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2385 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2387 /* Find a normal input file with GNU property note. */
2388 for (pbfd = info->input_bfds;
2390 pbfd = pbfd->link.next)
2391 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
2392 && bfd_count_sections (pbfd) != 0)
2396 if (elf_properties (pbfd) != NULL)
2400 if (ebfd != NULL && features)
2402 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
2403 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2404 prop = _bfd_elf_get_property (ebfd,
2405 GNU_PROPERTY_X86_FEATURE_1_AND,
2407 prop->u.number |= features;
2408 prop->pr_kind = property_number;
2410 /* Create the GNU property note section if needed. */
2413 sec = bfd_make_section_with_flags (ebfd,
2414 NOTE_GNU_PROPERTY_SECTION_NAME,
2422 info->callbacks->einfo (_("%F: failed to create GNU property section\n"));
2424 if (!bfd_set_section_alignment (ebfd, sec, class_align))
2427 info->callbacks->einfo (_("%F%A: failed to align section\n"),
2431 elf_section_type (sec) = SHT_NOTE;
2435 pbfd = _bfd_elf_link_setup_gnu_properties (info);
2437 bed = get_elf_backend_data (info->output_bfd);
2439 htab = elf_x86_hash_table (info, bed->target_id);
2443 htab->is_vxworks = init_table->is_vxworks;
2444 htab->r_info = init_table->r_info;
2445 htab->r_sym = init_table->r_sym;
2447 if (bfd_link_relocatable (info))
2450 use_ibt_plt = info->ibtplt || info->ibt;
2451 if (!use_ibt_plt && pbfd != NULL)
2453 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2454 elf_property_list *p;
2456 /* The property list is sorted in order of type. */
2457 for (p = elf_properties (pbfd); p; p = p->next)
2459 if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type)
2461 use_ibt_plt = !!(p->property.u.number
2462 & GNU_PROPERTY_X86_FEATURE_1_IBT);
2465 else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type)
2470 dynobj = htab->elf.dynobj;
2472 /* Set htab->elf.dynobj here so that there is no need to check and
2473 set it in check_relocs. */
2478 htab->elf.dynobj = pbfd;
2485 /* Find a normal input file to hold linker created
2487 for (abfd = info->input_bfds;
2489 abfd = abfd->link.next)
2490 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
2492 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
2494 htab->elf.dynobj = abfd;
2501 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2502 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2503 canonical function address. */
2504 htab->plt.has_plt0 = 1;
2505 normal_target = init_table->normal_target;
2511 htab->lazy_plt = init_table->lazy_ibt_plt;
2512 htab->non_lazy_plt = init_table->non_lazy_ibt_plt;
2516 htab->lazy_plt = init_table->lazy_plt;
2517 htab->non_lazy_plt = init_table->non_lazy_plt;
2522 htab->lazy_plt = init_table->lazy_plt;
2523 htab->non_lazy_plt = NULL;
2526 pltsec = htab->elf.splt;
2528 /* If the non-lazy PLT is available, use it for all PLT entries if
2529 there are no PLT0 or no .plt section. */
2530 if (htab->non_lazy_plt != NULL
2531 && (!htab->plt.has_plt0 || pltsec == NULL))
2534 if (bfd_link_pic (info))
2535 htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry;
2537 htab->plt.plt_entry = htab->non_lazy_plt->plt_entry;
2538 htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size;
2539 htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset;
2540 htab->plt.plt_got_insn_size
2541 = htab->non_lazy_plt->plt_got_insn_size;
2542 htab->plt.eh_frame_plt_size
2543 = htab->non_lazy_plt->eh_frame_plt_size;
2544 htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt;
2549 if (bfd_link_pic (info))
2551 htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry;
2552 htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry;
2556 htab->plt.plt0_entry = htab->lazy_plt->plt0_entry;
2557 htab->plt.plt_entry = htab->lazy_plt->plt_entry;
2559 htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size;
2560 htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset;
2561 htab->plt.plt_got_insn_size
2562 = htab->lazy_plt->plt_got_insn_size;
2563 htab->plt.eh_frame_plt_size
2564 = htab->lazy_plt->eh_frame_plt_size;
2565 htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt;
2568 /* Return if there are no normal input files. */
2572 if (htab->is_vxworks
2573 && !elf_vxworks_create_dynamic_sections (dynobj, info,
2576 info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
2580 /* Since create_dynamic_sections isn't always called, but GOT
2581 relocations need GOT relocations, create them here so that we
2582 don't need to do it in check_relocs. */
2583 if (htab->elf.sgot == NULL
2584 && !_bfd_elf_create_got_section (dynobj, info))
2585 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
2587 got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2;
2589 /* Align .got and .got.plt sections to their entry size. Do it here
2590 instead of in create_dynamic_sections so that they are always
2591 properly aligned even if create_dynamic_sections isn't called. */
2592 sec = htab->elf.sgot;
2593 if (!bfd_set_section_alignment (dynobj, sec, got_align))
2594 goto error_alignment;
2596 sec = htab->elf.sgotplt;
2597 if (!bfd_set_section_alignment (dynobj, sec, got_align))
2598 goto error_alignment;
2600 /* Create the ifunc sections here so that check_relocs can be
2602 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
2603 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
2605 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
2609 /* Whe creating executable, set the contents of the .interp
2610 section to the interpreter. */
2611 if (bfd_link_executable (info) && !info->nointerp)
2613 asection *s = bfd_get_linker_section (dynobj, ".interp");
2616 s->size = htab->dynamic_interpreter_size;
2617 s->contents = (unsigned char *) htab->dynamic_interpreter;
2621 /* Don't change PLT section alignment for NaCl since it uses
2622 64-byte PLT entry and sets PLT section alignment to 32
2623 bytes. Don't create additional PLT sections for NaCl. */
2626 flagword pltflags = (bed->dynamic_sec_flags
2631 unsigned int non_lazy_plt_alignment
2632 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
2635 if (!bfd_set_section_alignment (sec->owner, sec,
2637 goto error_alignment;
2639 /* Create the GOT procedure linkage table. */
2640 sec = bfd_make_section_anyway_with_flags (dynobj,
2644 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
2646 if (!bfd_set_section_alignment (dynobj, sec,
2647 non_lazy_plt_alignment))
2648 goto error_alignment;
2650 htab->plt_got = sec;
2658 /* Create the second PLT for Intel IBT support. IBT
2659 PLT is supported only for non-NaCl target and is
2660 is needed only for lazy binding. */
2661 sec = bfd_make_section_anyway_with_flags (dynobj,
2665 info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
2667 if (!bfd_set_section_alignment (dynobj, sec,
2669 goto error_alignment;
2671 else if (info->bndplt && ABI_64_P (dynobj))
2673 /* Create the second PLT for Intel MPX support. MPX
2674 PLT is supported only for non-NaCl target in 64-bit
2675 mode and is needed only for lazy binding. */
2676 sec = bfd_make_section_anyway_with_flags (dynobj,
2680 info->callbacks->einfo (_("%F: failed to create BND PLT section\n"));
2682 if (!bfd_set_section_alignment (dynobj, sec,
2683 non_lazy_plt_alignment))
2684 goto error_alignment;
2687 htab->plt_second = sec;
2691 if (!info->no_ld_generated_unwind_info)
2693 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2694 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2695 | SEC_LINKER_CREATED);
2697 sec = bfd_make_section_anyway_with_flags (dynobj,
2701 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
2703 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2704 goto error_alignment;
2706 htab->plt_eh_frame = sec;
2708 if (htab->plt_got != NULL)
2710 sec = bfd_make_section_anyway_with_flags (dynobj,
2714 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
2716 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2717 goto error_alignment;
2719 htab->plt_got_eh_frame = sec;
2722 if (htab->plt_second != NULL)
2724 sec = bfd_make_section_anyway_with_flags (dynobj,
2728 info->callbacks->einfo (_("%F: failed to create the second PLT .eh_frame section\n"));
2730 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2731 goto error_alignment;
2733 htab->plt_second_eh_frame = sec;
2740 /* The .iplt section is used for IFUNC symbols in static
2742 sec = htab->elf.iplt;
2744 && !bfd_set_section_alignment (sec->owner, sec,
2746 goto error_alignment;