1 /* x86 specific support for ELF
2 Copyright (C) 2017-2018 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 /* We can't use the GOT PLT if pointer equality is needed since
112 finish_dynamic_symbol won't clear symbol value and the dynamic
113 linker won't update the GOT slot. We will get into an infinite
115 if (htab->plt_got != NULL
116 && h->type != STT_GNU_IFUNC
117 && !h->pointer_equality_needed
118 && h->plt.refcount > 0
119 && h->got.refcount > 0)
121 /* Don't use the regular PLT if there are both GOT and GOTPLT
123 h->plt.offset = (bfd_vma) -1;
125 /* Use the GOT PLT. */
126 eh->plt_got.refcount = 1;
129 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
130 here if it is defined and referenced in a non-shared object. */
131 if (h->type == STT_GNU_IFUNC
134 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
135 &htab->readonly_dynrelocs_against_ifunc,
139 htab->got_entry_size,
142 asection *s = htab->plt_second;
143 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
145 /* Use the second PLT section if it is created. */
146 eh->plt_second.offset = s->size;
148 /* Make room for this entry in the second PLT section. */
149 s->size += htab->non_lazy_plt->plt_entry_size;
157 /* Don't create the PLT entry if there are only function pointer
158 relocations which can be resolved at run-time. */
159 else if (htab->elf.dynamic_sections_created
160 && (h->plt.refcount > 0
161 || eh->plt_got.refcount > 0))
163 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
165 /* Make sure this symbol is output as a dynamic symbol.
166 Undefined weak syms won't yet be marked as dynamic. */
170 && h->root.type == bfd_link_hash_undefweak)
172 if (! bfd_elf_link_record_dynamic_symbol (info, h))
176 if (bfd_link_pic (info)
177 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
179 asection *s = htab->elf.splt;
180 asection *second_s = htab->plt_second;
181 asection *got_s = htab->plt_got;
183 /* If this is the first .plt entry, make room for the special
184 first entry. The .plt section is used by prelink to undo
185 prelinking for dynamic relocations. */
187 s->size = htab->plt.has_plt0 * plt_entry_size;
190 eh->plt_got.offset = got_s->size;
193 h->plt.offset = s->size;
195 eh->plt_second.offset = second_s->size;
198 /* If this symbol is not defined in a regular file, and we are
199 not generating a shared library, then set the symbol to this
200 location in the .plt. This is required to make function
201 pointers compare as equal between the normal executable and
202 the shared library. */
203 if (! bfd_link_pic (info)
208 /* We need to make a call to the entry of the GOT PLT
209 instead of regular PLT entry. */
210 h->root.u.def.section = got_s;
211 h->root.u.def.value = eh->plt_got.offset;
217 /* We need to make a call to the entry of the
218 second PLT instead of regular PLT entry. */
219 h->root.u.def.section = second_s;
220 h->root.u.def.value = eh->plt_second.offset;
224 h->root.u.def.section = s;
225 h->root.u.def.value = h->plt.offset;
230 /* Make room for this entry. */
232 got_s->size += htab->non_lazy_plt->plt_entry_size;
235 s->size += plt_entry_size;
237 second_s->size += htab->non_lazy_plt->plt_entry_size;
239 /* We also need to make an entry in the .got.plt section,
240 which will be placed in the .got section by the linker
242 htab->elf.sgotplt->size += htab->got_entry_size;
244 /* There should be no PLT relocation against resolved
245 undefined weak symbol in executable. */
246 if (!resolved_to_zero)
248 /* We also need to make an entry in the .rel.plt
250 htab->elf.srelplt->size += htab->sizeof_reloc;
251 htab->elf.srelplt->reloc_count++;
255 if (htab->target_os == is_vxworks && !bfd_link_pic (info))
257 /* VxWorks has a second set of relocations for each PLT entry
258 in executables. They go in a separate relocation section,
259 which is processed by the kernel loader. */
261 /* There are two relocations for the initial PLT entry: an
262 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
263 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
265 asection *srelplt2 = htab->srelplt2;
266 if (h->plt.offset == plt_entry_size)
267 srelplt2->size += (htab->sizeof_reloc * 2);
269 /* There are two extra relocations for each subsequent PLT entry:
270 an R_386_32 relocation for the GOT entry, and an R_386_32
271 relocation for the PLT entry. */
273 srelplt2->size += (htab->sizeof_reloc * 2);
278 eh->plt_got.offset = (bfd_vma) -1;
279 h->plt.offset = (bfd_vma) -1;
285 eh->plt_got.offset = (bfd_vma) -1;
286 h->plt.offset = (bfd_vma) -1;
290 eh->tlsdesc_got = (bfd_vma) -1;
292 /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the
293 binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For
294 x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
295 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
296 if (h->got.refcount > 0
297 && bfd_link_executable (info)
299 && (elf_x86_hash_entry (h)->tls_type & GOT_TLS_IE))
300 h->got.offset = (bfd_vma) -1;
301 else if (h->got.refcount > 0)
305 int tls_type = elf_x86_hash_entry (h)->tls_type;
307 /* Make sure this symbol is output as a dynamic symbol.
308 Undefined weak syms won't yet be marked as dynamic. */
312 && h->root.type == bfd_link_hash_undefweak)
314 if (! bfd_elf_link_record_dynamic_symbol (info, h))
319 if (GOT_TLS_GDESC_P (tls_type))
321 eh->tlsdesc_got = htab->elf.sgotplt->size
322 - elf_x86_compute_jump_table_size (htab);
323 htab->elf.sgotplt->size += 2 * htab->got_entry_size;
324 h->got.offset = (bfd_vma) -2;
326 if (! GOT_TLS_GDESC_P (tls_type)
327 || GOT_TLS_GD_P (tls_type))
329 h->got.offset = s->size;
330 s->size += htab->got_entry_size;
331 /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
333 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
334 s->size += htab->got_entry_size;
336 dyn = htab->elf.dynamic_sections_created;
337 /* R_386_TLS_IE_32 needs one dynamic relocation,
338 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
339 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
340 need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local
341 symbol and two if global. No dynamic relocation against
342 resolved undefined weak symbol in executable. */
343 if (tls_type == GOT_TLS_IE_BOTH)
344 htab->elf.srelgot->size += 2 * htab->sizeof_reloc;
345 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
346 || (tls_type & GOT_TLS_IE))
347 htab->elf.srelgot->size += htab->sizeof_reloc;
348 else if (GOT_TLS_GD_P (tls_type))
349 htab->elf.srelgot->size += 2 * htab->sizeof_reloc;
350 else if (! GOT_TLS_GDESC_P (tls_type)
351 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
352 && !resolved_to_zero)
353 || h->root.type != bfd_link_hash_undefweak)
354 && (bfd_link_pic (info)
355 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
356 htab->elf.srelgot->size += htab->sizeof_reloc;
357 if (GOT_TLS_GDESC_P (tls_type))
359 htab->elf.srelplt->size += htab->sizeof_reloc;
360 if (bed->target_id == X86_64_ELF_DATA)
361 htab->tlsdesc_plt = (bfd_vma) -1;
365 h->got.offset = (bfd_vma) -1;
367 if (eh->dyn_relocs == NULL)
370 /* In the shared -Bsymbolic case, discard space allocated for
371 dynamic pc-relative relocs against symbols which turn out to be
372 defined in regular objects. For the normal shared case, discard
373 space for pc-relative relocs that have become local due to symbol
374 visibility changes. */
376 if (bfd_link_pic (info))
378 /* Relocs that use pc_count are those that appear on a call
379 insn, or certain REL relocs that can generated via assembly.
380 We want calls to protected symbols to resolve directly to the
381 function rather than going via the plt. If people want
382 function pointer comparisons to work as expected then they
383 should avoid writing weird assembly. */
384 if (SYMBOL_CALLS_LOCAL (info, h))
386 struct elf_dyn_relocs **pp;
388 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
390 p->count -= p->pc_count;
399 if (htab->target_os == is_vxworks)
401 struct elf_dyn_relocs **pp;
402 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
404 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
411 /* Also discard relocs on undefined weak syms with non-default
412 visibility or in PIE. */
413 if (eh->dyn_relocs != NULL)
415 if (h->root.type == bfd_link_hash_undefweak)
417 /* Undefined weak symbol is never bound locally in shared
419 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
422 if (bed->target_id == I386_ELF_DATA
425 /* Keep dynamic non-GOT/non-PLT relocation so
426 that we can branch to 0 without PLT. */
427 struct elf_dyn_relocs **pp;
429 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
430 if (p->pc_count == 0)
434 /* Remove non-R_386_PC32 relocation. */
435 p->count = p->pc_count;
439 /* Make sure undefined weak symbols are output
440 as dynamic symbols in PIEs for dynamic non-GOT
441 non-PLT reloations. */
442 if (eh->dyn_relocs != NULL
443 && !bfd_elf_link_record_dynamic_symbol (info, h))
447 eh->dyn_relocs = NULL;
449 else if (h->dynindx == -1
451 && !bfd_elf_link_record_dynamic_symbol (info, h))
454 else if (bfd_link_executable (info)
455 && (h->needs_copy || eh->needs_copy)
459 /* NB: needs_copy is set only for x86-64. For PIE,
460 discard space for pc-relative relocs against symbols
461 which turn out to need copy relocs. */
462 struct elf_dyn_relocs **pp;
464 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
466 if (p->pc_count != 0)
474 else if (ELIMINATE_COPY_RELOCS)
476 /* For the non-shared case, discard space for relocs against
477 symbols which turn out to need copy relocs or are not
478 dynamic. Keep dynamic relocations for run-time function
479 pointer initialization. */
482 || (h->root.type == bfd_link_hash_undefweak
483 && !resolved_to_zero))
486 || (htab->elf.dynamic_sections_created
487 && (h->root.type == bfd_link_hash_undefweak
488 || h->root.type == bfd_link_hash_undefined))))
490 /* Make sure this symbol is output as a dynamic symbol.
491 Undefined weak syms won't yet be marked as dynamic. */
495 && h->root.type == bfd_link_hash_undefweak
496 && ! bfd_elf_link_record_dynamic_symbol (info, h))
499 /* If that succeeded, we know we'll be keeping all the
501 if (h->dynindx != -1)
505 eh->dyn_relocs = NULL;
510 /* Finally, allocate space. */
511 for (p = eh->dyn_relocs; p != NULL; p = p->next)
515 sreloc = elf_section_data (p->sec)->sreloc;
517 BFD_ASSERT (sreloc != NULL);
518 sreloc->size += p->count * htab->sizeof_reloc;
524 /* Find dynamic relocs for H that apply to read-only sections. */
527 readonly_dynrelocs (struct elf_link_hash_entry *h)
529 struct elf_dyn_relocs *p;
531 for (p = elf_x86_hash_entry (h)->dyn_relocs; p != NULL; p = p->next)
533 asection *s = p->sec->output_section;
535 if (s != NULL && (s->flags & SEC_READONLY) != 0)
541 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
542 read-only sections. */
545 maybe_set_textrel (struct elf_link_hash_entry *h, void *inf)
549 if (h->root.type == bfd_link_hash_indirect)
552 /* Skip local IFUNC symbols. */
553 if (h->forced_local && h->type == STT_GNU_IFUNC)
556 sec = readonly_dynrelocs (h);
559 struct bfd_link_info *info = (struct bfd_link_info *) inf;
561 info->flags |= DF_TEXTREL;
562 /* xgettext:c-format */
563 info->callbacks->minfo (_("%B: dynamic relocation against `%T' "
564 "in read-only section `%A'\n"),
565 sec->owner, h->root.root.string, sec);
567 if ((info->warn_shared_textrel && bfd_link_pic (info))
568 || info->error_textrel)
569 /* xgettext:c-format */
570 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' "
571 "in read-only section `%A'\n"),
572 sec->owner, h->root.root.string, sec);
574 /* Not an error, just cut short the traversal. */
580 /* Allocate space in .plt, .got and associated reloc sections for
581 local dynamic relocs. */
584 elf_x86_allocate_local_dynreloc (void **slot, void *inf)
586 struct elf_link_hash_entry *h
587 = (struct elf_link_hash_entry *) *slot;
589 if (h->type != STT_GNU_IFUNC
593 || h->root.type != bfd_link_hash_defined)
596 return elf_x86_allocate_dynrelocs (h, inf);
599 /* Find and/or create a hash entry for local symbol. */
601 struct elf_link_hash_entry *
602 _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table *htab,
603 bfd *abfd, const Elf_Internal_Rela *rel,
606 struct elf_x86_link_hash_entry e, *ret;
607 asection *sec = abfd->sections;
608 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
609 htab->r_sym (rel->r_info));
612 e.elf.indx = sec->id;
613 e.elf.dynstr_index = htab->r_sym (rel->r_info);
614 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
615 create ? INSERT : NO_INSERT);
622 ret = (struct elf_x86_link_hash_entry *) *slot;
626 ret = (struct elf_x86_link_hash_entry *)
627 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
628 sizeof (struct elf_x86_link_hash_entry));
631 memset (ret, 0, sizeof (*ret));
632 ret->elf.indx = sec->id;
633 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
634 ret->elf.dynindx = -1;
635 ret->plt_got.offset = (bfd_vma) -1;
641 /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN
642 SYNC WITH _bfd_elf_link_hash_newfunc. */
644 struct bfd_hash_entry *
645 _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
646 struct bfd_hash_table *table,
649 /* Allocate the structure if it has not already been allocated by a
653 entry = (struct bfd_hash_entry *)
654 bfd_hash_allocate (table,
655 sizeof (struct elf_x86_link_hash_entry));
660 /* Call the allocation method of the superclass. */
661 entry = _bfd_link_hash_newfunc (entry, table, string);
664 struct elf_x86_link_hash_entry *eh
665 = (struct elf_x86_link_hash_entry *) entry;
666 struct elf_link_hash_table *htab
667 = (struct elf_link_hash_table *) table;
669 memset (&eh->elf.size, 0,
670 (sizeof (struct elf_x86_link_hash_entry)
671 - offsetof (struct elf_link_hash_entry, size)));
672 /* Set local fields. */
674 eh->elf.dynindx = -1;
675 eh->elf.got = htab->init_got_refcount;
676 eh->elf.plt = htab->init_plt_refcount;
677 /* Assume that we have been called by a non-ELF symbol reader.
678 This flag is then reset by the code which reads an ELF input
679 file. This ensures that a symbol created by a non-ELF symbol
680 reader will have the flag set correctly. */
682 eh->plt_second.offset = (bfd_vma) -1;
683 eh->plt_got.offset = (bfd_vma) -1;
684 eh->tlsdesc_got = (bfd_vma) -1;
685 eh->zero_undefweak = 1;
691 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
692 for local symbol so that we can handle local STT_GNU_IFUNC symbols
693 as global symbol. We reuse indx and dynstr_index for local symbol
694 hash since they aren't used by global symbols in this backend. */
697 _bfd_x86_elf_local_htab_hash (const void *ptr)
699 struct elf_link_hash_entry *h
700 = (struct elf_link_hash_entry *) ptr;
701 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
704 /* Compare local hash entries. */
707 _bfd_x86_elf_local_htab_eq (const void *ptr1, const void *ptr2)
709 struct elf_link_hash_entry *h1
710 = (struct elf_link_hash_entry *) ptr1;
711 struct elf_link_hash_entry *h2
712 = (struct elf_link_hash_entry *) ptr2;
714 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
717 /* Destroy an x86 ELF linker hash table. */
720 elf_x86_link_hash_table_free (bfd *obfd)
722 struct elf_x86_link_hash_table *htab
723 = (struct elf_x86_link_hash_table *) obfd->link.hash;
725 if (htab->loc_hash_table)
726 htab_delete (htab->loc_hash_table);
727 if (htab->loc_hash_memory)
728 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
729 _bfd_elf_link_hash_table_free (obfd);
733 elf_i386_is_reloc_section (const char *secname)
735 return CONST_STRNEQ (secname, ".rel");
739 elf_x86_64_is_reloc_section (const char *secname)
741 return CONST_STRNEQ (secname, ".rela");
744 /* Create an x86 ELF linker hash table. */
746 struct bfd_link_hash_table *
747 _bfd_x86_elf_link_hash_table_create (bfd *abfd)
749 struct elf_x86_link_hash_table *ret;
750 const struct elf_backend_data *bed;
751 bfd_size_type amt = sizeof (struct elf_x86_link_hash_table);
753 ret = (struct elf_x86_link_hash_table *) bfd_zmalloc (amt);
757 bed = get_elf_backend_data (abfd);
758 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
759 _bfd_x86_elf_link_hash_newfunc,
760 sizeof (struct elf_x86_link_hash_entry),
767 if (bed->target_id == X86_64_ELF_DATA)
769 ret->is_reloc_section = elf_x86_64_is_reloc_section;
770 ret->dt_reloc = DT_RELA;
771 ret->dt_reloc_sz = DT_RELASZ;
772 ret->dt_reloc_ent = DT_RELAENT;
773 ret->got_entry_size = 8;
774 ret->tls_get_addr = "__tls_get_addr";
778 ret->sizeof_reloc = sizeof (Elf64_External_Rela);
779 ret->pointer_r_type = R_X86_64_64;
780 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
781 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
785 if (bed->target_id == X86_64_ELF_DATA)
787 ret->sizeof_reloc = sizeof (Elf32_External_Rela);
788 ret->pointer_r_type = R_X86_64_32;
789 ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER;
790 ret->dynamic_interpreter_size
791 = sizeof ELFX32_DYNAMIC_INTERPRETER;
795 ret->is_reloc_section = elf_i386_is_reloc_section;
796 ret->dt_reloc = DT_REL;
797 ret->dt_reloc_sz = DT_RELSZ;
798 ret->dt_reloc_ent = DT_RELENT;
799 ret->sizeof_reloc = sizeof (Elf32_External_Rel);
800 ret->got_entry_size = 4;
801 ret->pointer_r_type = R_386_32;
802 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
803 ret->dynamic_interpreter_size
804 = sizeof ELF32_DYNAMIC_INTERPRETER;
805 ret->tls_get_addr = "___tls_get_addr";
808 ret->target_id = bed->target_id;
809 ret->target_os = get_elf_x86_backend_data (abfd)->target_os;
811 ret->loc_hash_table = htab_try_create (1024,
812 _bfd_x86_elf_local_htab_hash,
813 _bfd_x86_elf_local_htab_eq,
815 ret->loc_hash_memory = objalloc_create ();
816 if (!ret->loc_hash_table || !ret->loc_hash_memory)
818 elf_x86_link_hash_table_free (abfd);
821 ret->elf.root.hash_table_free = elf_x86_link_hash_table_free;
823 return &ret->elf.root;
826 /* Sort relocs into address order. */
829 _bfd_x86_elf_compare_relocs (const void *ap, const void *bp)
831 const arelent *a = * (const arelent **) ap;
832 const arelent *b = * (const arelent **) bp;
834 if (a->address > b->address)
836 else if (a->address < b->address)
843 _bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
845 if (!bfd_link_relocatable (info))
847 /* Check for __tls_get_addr reference. */
848 struct elf_x86_link_hash_table *htab;
849 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
850 htab = elf_x86_hash_table (info, bed->target_id);
853 struct elf_link_hash_entry *h;
855 h = elf_link_hash_lookup (elf_hash_table (info),
857 FALSE, FALSE, FALSE);
860 elf_x86_hash_entry (h)->tls_get_addr = 1;
862 /* Check the versioned __tls_get_addr symbol. */
863 while (h->root.type == bfd_link_hash_indirect)
865 h = (struct elf_link_hash_entry *) h->root.u.i.link;
866 elf_x86_hash_entry (h)->tls_get_addr = 1;
870 /* "__ehdr_start" will be defined by linker as a hidden symbol
871 later if it is referenced and not defined. */
872 h = elf_link_hash_lookup (elf_hash_table (info),
874 FALSE, FALSE, FALSE);
876 && (h->root.type == bfd_link_hash_new
877 || h->root.type == bfd_link_hash_undefined
878 || h->root.type == bfd_link_hash_undefweak
879 || h->root.type == bfd_link_hash_common))
881 elf_x86_hash_entry (h)->local_ref = 2;
882 elf_x86_hash_entry (h)->linker_def = 1;
887 /* Invoke the regular ELF backend linker to do all the work. */
888 return _bfd_elf_link_check_relocs (abfd, info);
891 /* Set the sizes of the dynamic sections. */
894 _bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
895 struct bfd_link_info *info)
897 struct elf_x86_link_hash_table *htab;
902 const struct elf_backend_data *bed
903 = get_elf_backend_data (output_bfd);
905 htab = elf_x86_hash_table (info, bed->target_id);
908 dynobj = htab->elf.dynobj;
912 /* Set up .got offsets for local syms, and space for local dynamic
914 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
916 bfd_signed_vma *local_got;
917 bfd_signed_vma *end_local_got;
918 char *local_tls_type;
919 bfd_vma *local_tlsdesc_gotent;
920 bfd_size_type locsymcount;
921 Elf_Internal_Shdr *symtab_hdr;
924 if (! is_x86_elf (ibfd, htab))
927 for (s = ibfd->sections; s != NULL; s = s->next)
929 struct elf_dyn_relocs *p;
931 for (p = ((struct elf_dyn_relocs *)
932 elf_section_data (s)->local_dynrel);
936 if (!bfd_is_abs_section (p->sec)
937 && bfd_is_abs_section (p->sec->output_section))
939 /* Input section has been discarded, either because
940 it is a copy of a linkonce section or due to
941 linker script /DISCARD/, so we'll be discarding
944 else if (htab->target_os == is_vxworks
945 && strcmp (p->sec->output_section->name,
948 /* Relocations in vxworks .tls_vars sections are
949 handled specially by the loader. */
951 else if (p->count != 0)
953 srel = elf_section_data (p->sec)->sreloc;
954 srel->size += p->count * htab->sizeof_reloc;
955 if ((p->sec->output_section->flags & SEC_READONLY) != 0
956 && (info->flags & DF_TEXTREL) == 0)
958 info->flags |= DF_TEXTREL;
959 if ((info->warn_shared_textrel && bfd_link_pic (info))
960 || info->error_textrel)
961 /* xgettext:c-format */
962 info->callbacks->einfo
963 (_("%P: %B: warning: relocation "
964 "in read-only section `%A'\n"),
965 p->sec->owner, p->sec);
971 local_got = elf_local_got_refcounts (ibfd);
975 symtab_hdr = &elf_symtab_hdr (ibfd);
976 locsymcount = symtab_hdr->sh_info;
977 end_local_got = local_got + locsymcount;
978 local_tls_type = elf_x86_local_got_tls_type (ibfd);
979 local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd);
981 srel = htab->elf.srelgot;
982 for (; local_got < end_local_got;
983 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
985 *local_tlsdesc_gotent = (bfd_vma) -1;
988 if (GOT_TLS_GDESC_P (*local_tls_type))
990 *local_tlsdesc_gotent = htab->elf.sgotplt->size
991 - elf_x86_compute_jump_table_size (htab);
992 htab->elf.sgotplt->size += 2 * htab->got_entry_size;
993 *local_got = (bfd_vma) -2;
995 if (! GOT_TLS_GDESC_P (*local_tls_type)
996 || GOT_TLS_GD_P (*local_tls_type))
998 *local_got = s->size;
999 s->size += htab->got_entry_size;
1000 if (GOT_TLS_GD_P (*local_tls_type)
1001 || *local_tls_type == GOT_TLS_IE_BOTH)
1002 s->size += htab->got_entry_size;
1004 if (bfd_link_pic (info)
1005 || GOT_TLS_GD_ANY_P (*local_tls_type)
1006 || (*local_tls_type & GOT_TLS_IE))
1008 if (*local_tls_type == GOT_TLS_IE_BOTH)
1009 srel->size += 2 * htab->sizeof_reloc;
1010 else if (GOT_TLS_GD_P (*local_tls_type)
1011 || ! GOT_TLS_GDESC_P (*local_tls_type))
1012 srel->size += htab->sizeof_reloc;
1013 if (GOT_TLS_GDESC_P (*local_tls_type))
1015 htab->elf.srelplt->size += htab->sizeof_reloc;
1016 if (bed->target_id == X86_64_ELF_DATA)
1017 htab->tlsdesc_plt = (bfd_vma) -1;
1022 *local_got = (bfd_vma) -1;
1026 if (htab->tls_ld_or_ldm_got.refcount > 0)
1028 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1029 or R_X86_64_TLSLD relocs. */
1030 htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
1031 htab->elf.sgot->size += 2 * htab->got_entry_size;
1032 htab->elf.srelgot->size += htab->sizeof_reloc;
1035 htab->tls_ld_or_ldm_got.offset = -1;
1037 /* Allocate global sym .plt and .got entries, and space for global
1038 sym dynamic relocs. */
1039 elf_link_hash_traverse (&htab->elf, elf_x86_allocate_dynrelocs,
1042 /* Allocate .plt and .got entries, and space for local symbols. */
1043 htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc,
1046 /* For every jump slot reserved in the sgotplt, reloc_count is
1047 incremented. However, when we reserve space for TLS descriptors,
1048 it's not incremented, so in order to compute the space reserved
1049 for them, it suffices to multiply the reloc count by the jump
1052 PR ld/13302: We start next_irelative_index at the end of .rela.plt
1053 so that R_{386,X86_64}_IRELATIVE entries come last. */
1054 if (htab->elf.srelplt)
1056 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
1057 htab->sgotplt_jump_table_size
1058 = elf_x86_compute_jump_table_size (htab);
1059 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
1061 else if (htab->elf.irelplt)
1062 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
1064 if (htab->tlsdesc_plt)
1066 /* NB: tlsdesc_plt is set only for x86-64. If we're not using
1067 lazy TLS relocations, don't generate the PLT and GOT entries
1069 if ((info->flags & DF_BIND_NOW))
1070 htab->tlsdesc_plt = 0;
1073 htab->tlsdesc_got = htab->elf.sgot->size;
1074 htab->elf.sgot->size += htab->got_entry_size;
1075 /* Reserve room for the initial entry.
1076 FIXME: we could probably do away with it in this case. */
1077 if (htab->elf.splt->size == 0)
1078 htab->elf.splt->size = htab->plt.plt_entry_size;
1079 htab->tlsdesc_plt = htab->elf.splt->size;
1080 htab->elf.splt->size += htab->plt.plt_entry_size;
1084 if (htab->elf.sgotplt)
1086 /* Don't allocate .got.plt section if there are no GOT nor PLT
1087 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
1088 if ((htab->elf.hgot == NULL
1089 || !htab->got_referenced)
1090 && (htab->elf.sgotplt->size == bed->got_header_size)
1091 && (htab->elf.splt == NULL
1092 || htab->elf.splt->size == 0)
1093 && (htab->elf.sgot == NULL
1094 || htab->elf.sgot->size == 0)
1095 && (htab->elf.iplt == NULL
1096 || htab->elf.iplt->size == 0)
1097 && (htab->elf.igotplt == NULL
1098 || htab->elf.igotplt->size == 0))
1100 htab->elf.sgotplt->size = 0;
1101 if (htab->elf.hgot != NULL
1102 && !htab->need_global_offset_table)
1104 /* Remove the unused _GLOBAL_OFFSET_TABLE_ from symbol
1106 htab->elf.hgot->root.type = bfd_link_hash_undefined;
1107 htab->elf.hgot->root.u.undef.abfd
1108 = htab->elf.hgot->root.u.def.section->owner;
1109 htab->elf.hgot->root.linker_def = 0;
1110 htab->elf.hgot->ref_regular = 0;
1111 htab->elf.hgot->def_regular = 0;
1116 if (_bfd_elf_eh_frame_present (info))
1118 if (htab->plt_eh_frame != NULL
1119 && htab->elf.splt != NULL
1120 && htab->elf.splt->size != 0
1121 && !bfd_is_abs_section (htab->elf.splt->output_section))
1122 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
1124 if (htab->plt_got_eh_frame != NULL
1125 && htab->plt_got != NULL
1126 && htab->plt_got->size != 0
1127 && !bfd_is_abs_section (htab->plt_got->output_section))
1128 htab->plt_got_eh_frame->size
1129 = htab->non_lazy_plt->eh_frame_plt_size;
1131 /* Unwind info for the second PLT and .plt.got sections are
1133 if (htab->plt_second_eh_frame != NULL
1134 && htab->plt_second != NULL
1135 && htab->plt_second->size != 0
1136 && !bfd_is_abs_section (htab->plt_second->output_section))
1137 htab->plt_second_eh_frame->size
1138 = htab->non_lazy_plt->eh_frame_plt_size;
1141 /* We now have determined the sizes of the various dynamic sections.
1142 Allocate memory for them. */
1144 for (s = dynobj->sections; s != NULL; s = s->next)
1146 bfd_boolean strip_section = TRUE;
1148 if ((s->flags & SEC_LINKER_CREATED) == 0)
1151 if (s == htab->elf.splt
1152 || s == htab->elf.sgot)
1154 /* Strip this section if we don't need it; see the
1156 /* We'd like to strip these sections if they aren't needed, but if
1157 we've exported dynamic symbols from them we must leave them.
1158 It's too late to tell BFD to get rid of the symbols. */
1160 if (htab->elf.hplt != NULL)
1161 strip_section = FALSE;
1163 else if (s == htab->elf.sgotplt
1164 || s == htab->elf.iplt
1165 || s == htab->elf.igotplt
1166 || s == htab->plt_second
1167 || s == htab->plt_got
1168 || s == htab->plt_eh_frame
1169 || s == htab->plt_got_eh_frame
1170 || s == htab->plt_second_eh_frame
1171 || s == htab->elf.sdynbss
1172 || s == htab->elf.sdynrelro)
1174 /* Strip these too. */
1176 else if (htab->is_reloc_section (bfd_get_section_name (dynobj, s)))
1179 && s != htab->elf.srelplt
1180 && s != htab->srelplt2)
1183 /* We use the reloc_count field as a counter if we need
1184 to copy relocs into the output file. */
1185 if (s != htab->elf.srelplt)
1190 /* It's not one of our sections, so don't allocate space. */
1196 /* If we don't need this section, strip it from the
1197 output file. This is mostly to handle .rel.bss and
1198 .rel.plt. We must create both sections in
1199 create_dynamic_sections, because they must be created
1200 before the linker maps input sections to output
1201 sections. The linker does that before
1202 adjust_dynamic_symbol is called, and it is that
1203 function which decides whether anything needs to go
1204 into these sections. */
1206 s->flags |= SEC_EXCLUDE;
1210 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1213 /* Allocate memory for the section contents. We use bfd_zalloc
1214 here in case unused entries are not reclaimed before the
1215 section's contents are written out. This should not happen,
1216 but this way if it does, we get a R_386_NONE or R_X86_64_NONE
1217 reloc instead of garbage. */
1218 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
1219 if (s->contents == NULL)
1223 if (htab->plt_eh_frame != NULL
1224 && htab->plt_eh_frame->contents != NULL)
1226 memcpy (htab->plt_eh_frame->contents,
1227 htab->plt.eh_frame_plt,
1228 htab->plt_eh_frame->size);
1229 bfd_put_32 (dynobj, htab->elf.splt->size,
1230 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
1233 if (htab->plt_got_eh_frame != NULL
1234 && htab->plt_got_eh_frame->contents != NULL)
1236 memcpy (htab->plt_got_eh_frame->contents,
1237 htab->non_lazy_plt->eh_frame_plt,
1238 htab->plt_got_eh_frame->size);
1239 bfd_put_32 (dynobj, htab->plt_got->size,
1240 (htab->plt_got_eh_frame->contents
1241 + PLT_FDE_LEN_OFFSET));
1244 if (htab->plt_second_eh_frame != NULL
1245 && htab->plt_second_eh_frame->contents != NULL)
1247 memcpy (htab->plt_second_eh_frame->contents,
1248 htab->non_lazy_plt->eh_frame_plt,
1249 htab->plt_second_eh_frame->size);
1250 bfd_put_32 (dynobj, htab->plt_second->size,
1251 (htab->plt_second_eh_frame->contents
1252 + PLT_FDE_LEN_OFFSET));
1255 if (htab->elf.dynamic_sections_created)
1257 /* Add some entries to the .dynamic section. We fill in the
1258 values later, in elf_{i386,x86_64}_finish_dynamic_sections,
1259 but we must add the entries now so that we get the correct
1260 size for the .dynamic section. The DT_DEBUG entry is filled
1261 in by the dynamic linker and used by the debugger. */
1262 #define add_dynamic_entry(TAG, VAL) \
1263 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1265 if (bfd_link_executable (info))
1267 if (!add_dynamic_entry (DT_DEBUG, 0))
1271 if (htab->elf.splt->size != 0)
1273 /* DT_PLTGOT is used by prelink even if there is no PLT
1275 if (!add_dynamic_entry (DT_PLTGOT, 0))
1279 if (htab->elf.srelplt->size != 0)
1281 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
1282 || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc)
1283 || !add_dynamic_entry (DT_JMPREL, 0))
1287 if (htab->tlsdesc_plt
1288 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
1289 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
1294 if (!add_dynamic_entry (htab->dt_reloc, 0)
1295 || !add_dynamic_entry (htab->dt_reloc_sz, 0)
1296 || !add_dynamic_entry (htab->dt_reloc_ent,
1297 htab->sizeof_reloc))
1300 /* If any dynamic relocs apply to a read-only section,
1301 then we need a DT_TEXTREL entry. */
1302 if ((info->flags & DF_TEXTREL) == 0)
1303 elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info);
1305 if ((info->flags & DF_TEXTREL) != 0)
1307 if (htab->readonly_dynrelocs_against_ifunc)
1309 info->callbacks->einfo
1310 (_("%P%X: read-only segment has dynamic IFUNC relocations;"
1311 " recompile with -fPIC\n"));
1312 bfd_set_error (bfd_error_bad_value);
1316 if (!add_dynamic_entry (DT_TEXTREL, 0))
1320 if (htab->target_os == is_vxworks
1321 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
1324 #undef add_dynamic_entry
1329 /* Finish up the x86 dynamic sections. */
1331 struct elf_x86_link_hash_table *
1332 _bfd_x86_elf_finish_dynamic_sections (bfd *output_bfd,
1333 struct bfd_link_info *info)
1335 struct elf_x86_link_hash_table *htab;
1336 const struct elf_backend_data *bed;
1339 bfd_byte *dyncon, *dynconend;
1340 bfd_size_type sizeof_dyn;
1342 bed = get_elf_backend_data (output_bfd);
1343 htab = elf_x86_hash_table (info, bed->target_id);
1347 dynobj = htab->elf.dynobj;
1348 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1350 /* GOT is always created in setup_gnu_properties. But it may not be
1351 needed. .got.plt section may be needed for static IFUNC. */
1352 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
1354 bfd_vma dynamic_addr;
1356 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
1359 (_("discarded output section: `%A'"), htab->elf.sgotplt);
1363 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
1364 = htab->got_entry_size;
1366 dynamic_addr = (sdyn == NULL
1368 : sdyn->output_section->vma + sdyn->output_offset);
1370 /* Set the first entry in the global offset table to the address
1371 of the dynamic section. Write GOT[1] and GOT[2], needed for
1372 the dynamic linker. */
1373 if (htab->got_entry_size == 8)
1375 bfd_put_64 (output_bfd, dynamic_addr,
1376 htab->elf.sgotplt->contents);
1377 bfd_put_64 (output_bfd, (bfd_vma) 0,
1378 htab->elf.sgotplt->contents + 8);
1379 bfd_put_64 (output_bfd, (bfd_vma) 0,
1380 htab->elf.sgotplt->contents + 8*2);
1384 bfd_put_32 (output_bfd, dynamic_addr,
1385 htab->elf.sgotplt->contents);
1386 bfd_put_32 (output_bfd, 0,
1387 htab->elf.sgotplt->contents + 4);
1388 bfd_put_32 (output_bfd, 0,
1389 htab->elf.sgotplt->contents + 4*2);
1393 if (!htab->elf.dynamic_sections_created)
1396 if (sdyn == NULL || htab->elf.sgot == NULL)
1399 sizeof_dyn = bed->s->sizeof_dyn;
1400 dyncon = sdyn->contents;
1401 dynconend = sdyn->contents + sdyn->size;
1402 for (; dyncon < dynconend; dyncon += sizeof_dyn)
1404 Elf_Internal_Dyn dyn;
1407 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
1412 if (htab->target_os == is_vxworks
1413 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
1418 s = htab->elf.sgotplt;
1419 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1423 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
1427 s = htab->elf.srelplt->output_section;
1428 dyn.d_un.d_val = s->size;
1431 case DT_TLSDESC_PLT:
1433 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
1434 + htab->tlsdesc_plt;
1437 case DT_TLSDESC_GOT:
1439 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
1440 + htab->tlsdesc_got;
1444 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
1447 if (htab->plt_got != NULL && htab->plt_got->size > 0)
1448 elf_section_data (htab->plt_got->output_section)
1449 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
1451 if (htab->plt_second != NULL && htab->plt_second->size > 0)
1452 elf_section_data (htab->plt_second->output_section)
1453 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
1455 /* Adjust .eh_frame for .plt section. */
1456 if (htab->plt_eh_frame != NULL
1457 && htab->plt_eh_frame->contents != NULL)
1459 if (htab->elf.splt != NULL
1460 && htab->elf.splt->size != 0
1461 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
1462 && htab->elf.splt->output_section != NULL
1463 && htab->plt_eh_frame->output_section != NULL)
1465 bfd_vma plt_start = htab->elf.splt->output_section->vma;
1466 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
1467 + htab->plt_eh_frame->output_offset
1468 + PLT_FDE_START_OFFSET;
1469 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1470 htab->plt_eh_frame->contents
1471 + PLT_FDE_START_OFFSET);
1474 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
1476 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1478 htab->plt_eh_frame->contents))
1483 /* Adjust .eh_frame for .plt.got section. */
1484 if (htab->plt_got_eh_frame != NULL
1485 && htab->plt_got_eh_frame->contents != NULL)
1487 if (htab->plt_got != NULL
1488 && htab->plt_got->size != 0
1489 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
1490 && htab->plt_got->output_section != NULL
1491 && htab->plt_got_eh_frame->output_section != NULL)
1493 bfd_vma plt_start = htab->plt_got->output_section->vma;
1494 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
1495 + htab->plt_got_eh_frame->output_offset
1496 + PLT_FDE_START_OFFSET;
1497 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1498 htab->plt_got_eh_frame->contents
1499 + PLT_FDE_START_OFFSET);
1501 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
1503 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1504 htab->plt_got_eh_frame,
1505 htab->plt_got_eh_frame->contents))
1510 /* Adjust .eh_frame for the second PLT section. */
1511 if (htab->plt_second_eh_frame != NULL
1512 && htab->plt_second_eh_frame->contents != NULL)
1514 if (htab->plt_second != NULL
1515 && htab->plt_second->size != 0
1516 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
1517 && htab->plt_second->output_section != NULL
1518 && htab->plt_second_eh_frame->output_section != NULL)
1520 bfd_vma plt_start = htab->plt_second->output_section->vma;
1521 bfd_vma eh_frame_start
1522 = (htab->plt_second_eh_frame->output_section->vma
1523 + htab->plt_second_eh_frame->output_offset
1524 + PLT_FDE_START_OFFSET);
1525 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
1526 htab->plt_second_eh_frame->contents
1527 + PLT_FDE_START_OFFSET);
1529 if (htab->plt_second_eh_frame->sec_info_type
1530 == SEC_INFO_TYPE_EH_FRAME)
1532 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
1533 htab->plt_second_eh_frame,
1534 htab->plt_second_eh_frame->contents))
1539 if (htab->elf.sgot && htab->elf.sgot->size > 0)
1540 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
1541 = htab->got_entry_size;
1548 _bfd_x86_elf_always_size_sections (bfd *output_bfd,
1549 struct bfd_link_info *info)
1551 asection *tls_sec = elf_hash_table (info)->tls_sec;
1555 struct elf_link_hash_entry *tlsbase;
1557 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
1558 "_TLS_MODULE_BASE_",
1559 FALSE, FALSE, FALSE);
1561 if (tlsbase && tlsbase->type == STT_TLS)
1563 struct elf_x86_link_hash_table *htab;
1564 struct bfd_link_hash_entry *bh = NULL;
1565 const struct elf_backend_data *bed
1566 = get_elf_backend_data (output_bfd);
1568 htab = elf_x86_hash_table (info, bed->target_id);
1572 if (!(_bfd_generic_link_add_one_symbol
1573 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
1574 tls_sec, 0, NULL, FALSE,
1575 bed->collect, &bh)))
1578 htab->tls_module_base = bh;
1580 tlsbase = (struct elf_link_hash_entry *)bh;
1581 tlsbase->def_regular = 1;
1582 tlsbase->other = STV_HIDDEN;
1583 tlsbase->root.linker_def = 1;
1584 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
1592 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry *h,
1593 const Elf_Internal_Sym *isym,
1594 bfd_boolean definition,
1595 bfd_boolean dynamic ATTRIBUTE_UNUSED)
1599 struct elf_x86_link_hash_entry *eh
1600 = (struct elf_x86_link_hash_entry *) h;
1601 eh->def_protected = (ELF_ST_VISIBILITY (isym->st_other)
1606 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1609 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info *info,
1610 struct elf_link_hash_entry *dir,
1611 struct elf_link_hash_entry *ind)
1613 struct elf_x86_link_hash_entry *edir, *eind;
1615 edir = (struct elf_x86_link_hash_entry *) dir;
1616 eind = (struct elf_x86_link_hash_entry *) ind;
1618 if (eind->dyn_relocs != NULL)
1620 if (edir->dyn_relocs != NULL)
1622 struct elf_dyn_relocs **pp;
1623 struct elf_dyn_relocs *p;
1625 /* Add reloc counts against the indirect sym to the direct sym
1626 list. Merge any entries against the same section. */
1627 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1629 struct elf_dyn_relocs *q;
1631 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1632 if (q->sec == p->sec)
1634 q->pc_count += p->pc_count;
1635 q->count += p->count;
1642 *pp = edir->dyn_relocs;
1645 edir->dyn_relocs = eind->dyn_relocs;
1646 eind->dyn_relocs = NULL;
1649 if (ind->root.type == bfd_link_hash_indirect
1650 && dir->got.refcount <= 0)
1652 edir->tls_type = eind->tls_type;
1653 eind->tls_type = GOT_UNKNOWN;
1656 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1657 generate a R_386_COPY reloc. */
1658 edir->gotoff_ref |= eind->gotoff_ref;
1660 edir->zero_undefweak |= eind->zero_undefweak;
1662 if (ELIMINATE_COPY_RELOCS
1663 && ind->root.type != bfd_link_hash_indirect
1664 && dir->dynamic_adjusted)
1666 /* If called to transfer flags for a weakdef during processing
1667 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1668 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1669 if (dir->versioned != versioned_hidden)
1670 dir->ref_dynamic |= ind->ref_dynamic;
1671 dir->ref_regular |= ind->ref_regular;
1672 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1673 dir->needs_plt |= ind->needs_plt;
1674 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1677 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1680 /* Remove undefined weak symbol from the dynamic symbol table if it
1681 is resolved to 0. */
1684 _bfd_x86_elf_fixup_symbol (struct bfd_link_info *info,
1685 struct elf_link_hash_entry *h)
1687 if (h->dynindx != -1
1688 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, elf_x86_hash_entry (h)))
1691 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
1697 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1700 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry *h)
1702 if (h->plt.offset != (bfd_vma) -1
1704 && !h->pointer_equality_needed)
1707 return _bfd_elf_hash_symbol (h);
1710 /* Adjust a symbol defined by a dynamic object and referenced by a
1711 regular object. The current definition is in some section of the
1712 dynamic object, but we're not including those sections. We have to
1713 change the definition to something the rest of the link can
1717 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
1718 struct elf_link_hash_entry *h)
1720 struct elf_x86_link_hash_table *htab;
1722 struct elf_x86_link_hash_entry *eh;
1723 struct elf_dyn_relocs *p;
1724 const struct elf_backend_data *bed
1725 = get_elf_backend_data (info->output_bfd);
1727 /* STT_GNU_IFUNC symbol must go through PLT. */
1728 if (h->type == STT_GNU_IFUNC)
1730 /* All local STT_GNU_IFUNC references must be treate as local
1731 calls via local PLT. */
1733 && SYMBOL_CALLS_LOCAL (info, h))
1735 bfd_size_type pc_count = 0, count = 0;
1736 struct elf_dyn_relocs **pp;
1738 eh = (struct elf_x86_link_hash_entry *) h;
1739 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1741 pc_count += p->pc_count;
1742 p->count -= p->pc_count;
1751 if (pc_count || count)
1756 /* Increment PLT reference count only for PC-relative
1759 if (h->plt.refcount <= 0)
1760 h->plt.refcount = 1;
1762 h->plt.refcount += 1;
1767 if (h->plt.refcount <= 0)
1769 h->plt.offset = (bfd_vma) -1;
1775 /* If this is a function, put it in the procedure linkage table. We
1776 will fill in the contents of the procedure linkage table later,
1777 when we know the address of the .got section. */
1778 if (h->type == STT_FUNC
1781 if (h->plt.refcount <= 0
1782 || SYMBOL_CALLS_LOCAL (info, h)
1783 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1784 && h->root.type == bfd_link_hash_undefweak))
1786 /* This case can occur if we saw a PLT32 reloc in an input
1787 file, but the symbol was never referred to by a dynamic
1788 object, or if all references were garbage collected. In
1789 such a case, we don't actually need to build a procedure
1790 linkage table, and we can just do a PC32 reloc instead. */
1791 h->plt.offset = (bfd_vma) -1;
1798 /* It's possible that we incorrectly decided a .plt reloc was needed
1799 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1800 check_relocs. We can't decide accurately between function and
1801 non-function syms in check-relocs; Objects loaded later in
1802 the link may change h->type. So fix it now. */
1803 h->plt.offset = (bfd_vma) -1;
1805 eh = (struct elf_x86_link_hash_entry *) h;
1807 /* If this is a weak symbol, and there is a real definition, the
1808 processor independent code will have arranged for us to see the
1809 real definition first, and we can just use the same value. */
1810 if (h->is_weakalias)
1812 struct elf_link_hash_entry *def = weakdef (h);
1813 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1814 h->root.u.def.section = def->root.u.def.section;
1815 h->root.u.def.value = def->root.u.def.value;
1816 if (ELIMINATE_COPY_RELOCS
1817 || info->nocopyreloc
1818 || SYMBOL_NO_COPYRELOC (info, eh))
1820 /* NB: needs_copy is always 0 for i386. */
1821 h->non_got_ref = def->non_got_ref;
1822 eh->needs_copy = def->needs_copy;
1827 /* This is a reference to a symbol defined by a dynamic object which
1828 is not a function. */
1830 /* If we are creating a shared library, we must presume that the
1831 only references to the symbol are via the global offset table.
1832 For such cases we need not do anything here; the relocations will
1833 be handled correctly by relocate_section. */
1834 if (!bfd_link_executable (info))
1837 /* If there are no references to this symbol that do not use the
1838 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1839 reloc. NB: gotoff_ref is always 0 for x86-64. */
1840 if (!h->non_got_ref && !eh->gotoff_ref)
1843 /* If -z nocopyreloc was given, we won't generate them either. */
1844 if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh))
1850 htab = elf_x86_hash_table (info, bed->target_id);
1854 /* If there aren't any dynamic relocs in read-only sections nor
1855 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1856 avoid the copy reloc. This doesn't work on VxWorks, where we can
1857 not have dynamic relocations (other than copy and jump slot
1858 relocations) in an executable. */
1859 if (ELIMINATE_COPY_RELOCS
1860 && (bed->target_id == X86_64_ELF_DATA
1862 && htab->target_os != is_vxworks)))
1864 /* If we don't find any dynamic relocs in read-only sections,
1865 then we'll be keeping the dynamic relocs and avoiding the copy
1867 if (!readonly_dynrelocs (h))
1874 /* We must allocate the symbol in our .dynbss section, which will
1875 become part of the .bss section of the executable. There will be
1876 an entry for this symbol in the .dynsym section. The dynamic
1877 object will contain position independent code, so all references
1878 from the dynamic object to this symbol will go through the global
1879 offset table. The dynamic linker will use the .dynsym entry to
1880 determine the address it must put in the global offset table, so
1881 both the dynamic object and the regular object will refer to the
1882 same memory location for the variable. */
1884 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1885 dynamic linker to copy the initial value out of the dynamic object
1886 and into the runtime process image. */
1887 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1889 s = htab->elf.sdynrelro;
1890 srel = htab->elf.sreldynrelro;
1894 s = htab->elf.sdynbss;
1895 srel = htab->elf.srelbss;
1897 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1899 srel->size += htab->sizeof_reloc;
1903 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1907 _bfd_x86_elf_hide_symbol (struct bfd_link_info *info,
1908 struct elf_link_hash_entry *h,
1909 bfd_boolean force_local)
1911 if (h->root.type == bfd_link_hash_undefweak
1913 && bfd_link_pie (info))
1915 /* When there is no dynamic interpreter in PIE, make the undefined
1916 weak symbol dynamic so that PC relative branch to the undefined
1917 weak symbol will land to address 0. */
1918 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1919 if (h->plt.refcount > 0
1920 || eh->plt_got.refcount > 0)
1924 _bfd_elf_link_hash_hide_symbol (info, h, force_local);
1927 /* Return TRUE if a symbol is referenced locally. It is similar to
1928 SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
1929 works in check_relocs. */
1932 _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info,
1933 struct elf_link_hash_entry *h)
1935 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1936 struct elf_x86_link_hash_table *htab
1937 = (struct elf_x86_link_hash_table *) info->hash;
1939 if (eh->local_ref > 1)
1942 if (eh->local_ref == 1)
1945 /* Unversioned symbols defined in regular objects can be forced local
1946 by linker version script. A weak undefined symbol is forced local
1948 1. It has non-default visibility. Or
1949 2. When building executable, there is no dynamic linker. Or
1950 3. or "-z nodynamic-undefined-weak" is used.
1952 if (SYMBOL_REFERENCES_LOCAL (info, h)
1953 || (h->root.type == bfd_link_hash_undefweak
1954 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1955 || (bfd_link_executable (info)
1956 && htab->interp == NULL)
1957 || info->dynamic_undefined_weak == 0))
1958 || ((h->def_regular || ELF_COMMON_DEF_P (h))
1959 && h->versioned == unversioned
1960 && info->version_info != NULL
1961 && bfd_hide_sym_by_version (info->version_info,
1962 h->root.root.string)))
1972 /* Return the section that should be marked against GC for a given
1976 _bfd_x86_elf_gc_mark_hook (asection *sec,
1977 struct bfd_link_info *info,
1978 Elf_Internal_Rela *rel,
1979 struct elf_link_hash_entry *h,
1980 Elf_Internal_Sym *sym)
1982 /* Compiler should optimize this out. */
1983 if (((unsigned int) R_X86_64_GNU_VTINHERIT
1984 != (unsigned int) R_386_GNU_VTINHERIT)
1985 || ((unsigned int) R_X86_64_GNU_VTENTRY
1986 != (unsigned int) R_386_GNU_VTENTRY))
1990 switch (ELF32_R_TYPE (rel->r_info))
1992 case R_X86_64_GNU_VTINHERIT:
1993 case R_X86_64_GNU_VTENTRY:
1997 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2001 elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED,
2003 bfd_vma offset ATTRIBUTE_UNUSED,
2006 return got_addr + off;
2010 elf_x86_64_get_plt_got_vma (struct elf_x86_plt *plt_p,
2013 bfd_vma got_addr ATTRIBUTE_UNUSED)
2015 return plt_p->sec->vma + offset + off + plt_p->plt_got_insn_size;
2019 elf_i386_valid_plt_reloc_p (unsigned int type)
2021 return (type == R_386_JUMP_SLOT
2022 || type == R_386_GLOB_DAT
2023 || type == R_386_IRELATIVE);
2027 elf_x86_64_valid_plt_reloc_p (unsigned int type)
2029 return (type == R_X86_64_JUMP_SLOT
2030 || type == R_X86_64_GLOB_DAT
2031 || type == R_X86_64_IRELATIVE);
2035 _bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
2039 struct elf_x86_plt plts[],
2043 long size, i, n, len;
2045 unsigned int plt_got_offset, plt_entry_size;
2047 bfd_byte *plt_contents;
2049 arelent **dynrelbuf, *p;
2051 const struct elf_backend_data *bed;
2052 bfd_vma (*get_plt_got_vma) (struct elf_x86_plt *, bfd_vma, bfd_vma,
2054 bfd_boolean (*valid_plt_reloc_p) (unsigned int);
2059 dynrelbuf = (arelent **) bfd_malloc (relsize);
2060 if (dynrelbuf == NULL)
2063 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
2065 if (dynrelcount <= 0)
2068 /* Sort the relocs by address. */
2069 qsort (dynrelbuf, dynrelcount, sizeof (arelent *),
2070 _bfd_x86_elf_compare_relocs);
2072 size = count * sizeof (asymbol);
2074 /* Allocate space for @plt suffixes. */
2076 for (i = 0; i < dynrelcount; i++)
2079 size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
2081 size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
2084 s = *ret = (asymbol *) bfd_zmalloc (size);
2088 bed = get_elf_backend_data (abfd);
2090 if (bed->target_id == X86_64_ELF_DATA)
2092 get_plt_got_vma = elf_x86_64_get_plt_got_vma;
2093 valid_plt_reloc_p = elf_x86_64_valid_plt_reloc_p;
2097 get_plt_got_vma = elf_i386_get_plt_got_vma;
2098 valid_plt_reloc_p = elf_i386_valid_plt_reloc_p;
2101 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
2103 asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
2105 got_addr = sec->vma;
2108 sec = bfd_get_section_by_name (abfd, ".got");
2110 got_addr = sec->vma;
2113 if (got_addr == (bfd_vma) -1)
2118 /* Check for each PLT section. */
2119 names = (char *) (s + count);
2122 for (j = 0; plts[j].name != NULL; j++)
2123 if ((plt_contents = plts[j].contents) != NULL)
2128 struct elf_x86_plt *plt_p = &plts[j];
2130 plt_got_offset = plt_p->plt_got_offset;
2131 plt_entry_size = plt_p->plt_entry_size;
2135 if ((plt_p->type & plt_lazy))
2137 /* Skip PLT0 in lazy PLT. */
2139 offset = plt_entry_size;
2147 /* Check each PLT entry against dynamic relocations. */
2148 for (; k < plt_p->count; k++)
2154 /* Get the GOT offset for i386 or the PC-relative offset
2155 for x86-64, a signed 32-bit integer. */
2156 off = H_GET_32 (abfd, (plt_contents + offset
2158 got_vma = get_plt_got_vma (plt_p, off, offset, got_addr);
2160 /* Binary search. */
2164 while ((min + 1) < max)
2168 mid = (min + max) / 2;
2170 if (got_vma > r->address)
2172 else if (got_vma < r->address)
2181 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
2182 if (got_vma == p->address
2184 && valid_plt_reloc_p (p->howto->type))
2186 *s = **p->sym_ptr_ptr;
2187 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
2188 set. Since we are defining a symbol, ensure one
2190 if ((s->flags & BSF_LOCAL) == 0)
2191 s->flags |= BSF_GLOBAL;
2192 s->flags |= BSF_SYNTHETIC;
2193 /* This is no longer a section symbol. */
2194 s->flags &= ~BSF_SECTION_SYM;
2196 s->the_bfd = plt->owner;
2200 len = strlen ((*p->sym_ptr_ptr)->name);
2201 memcpy (names, (*p->sym_ptr_ptr)->name, len);
2207 memcpy (names, "+0x", sizeof ("+0x") - 1);
2208 names += sizeof ("+0x") - 1;
2209 bfd_sprintf_vma (abfd, buf, p->addend);
2210 for (a = buf; *a == '0'; ++a)
2213 memcpy (names, a, size);
2216 memcpy (names, "@plt", sizeof ("@plt"));
2217 names += sizeof ("@plt");
2220 /* There should be only one entry in PLT for a given
2221 symbol. Set howto to NULL after processing a PLT
2222 entry to guard against corrupted PLT. */
2225 offset += plt_entry_size;
2229 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
2238 for (j = 0; plts[j].name != NULL; j++)
2239 if (plts[j].contents != NULL)
2240 free (plts[j].contents);
2247 /* Parse x86 GNU properties. */
2249 enum elf_property_kind
2250 _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type,
2251 bfd_byte *ptr, unsigned int datasz)
2257 case GNU_PROPERTY_X86_ISA_1_USED:
2258 case GNU_PROPERTY_X86_ISA_1_NEEDED:
2259 case GNU_PROPERTY_X86_FEATURE_1_AND:
2263 ((type == GNU_PROPERTY_X86_ISA_1_USED
2264 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
2265 : (type == GNU_PROPERTY_X86_ISA_1_NEEDED
2266 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
2267 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
2269 return property_corrupt;
2271 prop = _bfd_elf_get_property (abfd, type, datasz);
2272 /* Combine properties of the same type. */
2273 prop->u.number |= bfd_h_get_32 (abfd, ptr);
2274 prop->pr_kind = property_number;
2278 return property_ignored;
2281 return property_number;
2284 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
2285 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
2286 should be merged with ABFD. */
2289 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info,
2290 bfd *abfd ATTRIBUTE_UNUSED,
2291 elf_property *aprop,
2292 elf_property *bprop)
2294 unsigned int number, features;
2295 bfd_boolean updated = FALSE;
2296 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
2300 case GNU_PROPERTY_X86_ISA_1_USED:
2301 case GNU_PROPERTY_X86_ISA_1_NEEDED:
2302 if (aprop != NULL && bprop != NULL)
2304 number = aprop->u.number;
2305 aprop->u.number = number | bprop->u.number;
2306 updated = number != (unsigned int) aprop->u.number;
2310 /* Return TRUE if APROP is NULL to indicate that BPROP should
2311 be added to ABFD. */
2312 updated = aprop == NULL;
2316 case GNU_PROPERTY_X86_FEATURE_1_AND:
2317 /* Only one of APROP and BPROP can be NULL:
2318 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2319 2. If APROP is NULL, remove x86 feature.
2320 3. Otherwise, do nothing.
2322 if (aprop != NULL && bprop != NULL)
2326 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2328 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2329 number = aprop->u.number;
2330 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2331 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2332 aprop->u.number = (number & bprop->u.number) | features;
2333 updated = number != (unsigned int) aprop->u.number;
2334 /* Remove the property if all feature bits are cleared. */
2335 if (aprop->u.number == 0)
2336 aprop->pr_kind = property_remove;
2342 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2344 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2347 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2348 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2351 number = aprop->u.number;
2352 aprop->u.number = number | features;
2353 updated = number != (unsigned int) aprop->u.number;
2357 bprop->u.number |= features;
2361 else if (aprop != NULL)
2363 aprop->pr_kind = property_remove;
2370 /* Never should happen. */
2377 /* Set up x86 GNU properties. Return the first relocatable ELF input
2378 with GNU properties if found. Otherwise, return NULL. */
2381 _bfd_x86_elf_link_setup_gnu_properties
2382 (struct bfd_link_info *info, struct elf_x86_init_table *init_table)
2384 bfd_boolean normal_target;
2385 bfd_boolean lazy_plt;
2386 asection *sec, *pltsec;
2388 bfd_boolean use_ibt_plt;
2389 unsigned int plt_alignment, features;
2390 struct elf_x86_link_hash_table *htab;
2394 const struct elf_backend_data *bed;
2395 unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2;
2396 unsigned int got_align;
2400 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
2402 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
2404 /* Find a normal input file with GNU property note. */
2405 for (pbfd = info->input_bfds;
2407 pbfd = pbfd->link.next)
2408 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
2409 && bfd_count_sections (pbfd) != 0)
2413 if (elf_properties (pbfd) != NULL)
2417 if (ebfd != NULL && features)
2419 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
2420 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2421 prop = _bfd_elf_get_property (ebfd,
2422 GNU_PROPERTY_X86_FEATURE_1_AND,
2424 prop->u.number |= features;
2425 prop->pr_kind = property_number;
2427 /* Create the GNU property note section if needed. */
2430 sec = bfd_make_section_with_flags (ebfd,
2431 NOTE_GNU_PROPERTY_SECTION_NAME,
2439 info->callbacks->einfo (_("%F%P: failed to create GNU property section\n"));
2441 if (!bfd_set_section_alignment (ebfd, sec, class_align))
2444 info->callbacks->einfo (_("%F%A: failed to align section\n"),
2448 elf_section_type (sec) = SHT_NOTE;
2452 pbfd = _bfd_elf_link_setup_gnu_properties (info);
2454 bed = get_elf_backend_data (info->output_bfd);
2456 htab = elf_x86_hash_table (info, bed->target_id);
2460 htab->r_info = init_table->r_info;
2461 htab->r_sym = init_table->r_sym;
2463 if (bfd_link_relocatable (info))
2466 htab->plt0_pad_byte = init_table->plt0_pad_byte;
2467 htab->need_global_offset_table = init_table->need_global_offset_table;
2469 use_ibt_plt = info->ibtplt || info->ibt;
2470 if (!use_ibt_plt && pbfd != NULL)
2472 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2473 elf_property_list *p;
2475 /* The property list is sorted in order of type. */
2476 for (p = elf_properties (pbfd); p; p = p->next)
2478 if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type)
2480 use_ibt_plt = !!(p->property.u.number
2481 & GNU_PROPERTY_X86_FEATURE_1_IBT);
2484 else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type)
2489 dynobj = htab->elf.dynobj;
2491 /* Set htab->elf.dynobj here so that there is no need to check and
2492 set it in check_relocs. */
2497 htab->elf.dynobj = pbfd;
2504 /* Find a normal input file to hold linker created
2506 for (abfd = info->input_bfds;
2508 abfd = abfd->link.next)
2509 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
2511 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
2513 htab->elf.dynobj = abfd;
2520 /* Return if there are no normal input files. */
2524 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2525 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2526 canonical function address. */
2527 htab->plt.has_plt0 = 1;
2528 normal_target = htab->target_os == is_normal;
2534 htab->lazy_plt = init_table->lazy_ibt_plt;
2535 htab->non_lazy_plt = init_table->non_lazy_ibt_plt;
2539 htab->lazy_plt = init_table->lazy_plt;
2540 htab->non_lazy_plt = init_table->non_lazy_plt;
2545 htab->lazy_plt = init_table->lazy_plt;
2546 htab->non_lazy_plt = NULL;
2549 pltsec = htab->elf.splt;
2551 /* If the non-lazy PLT is available, use it for all PLT entries if
2552 there are no PLT0 or no .plt section. */
2553 if (htab->non_lazy_plt != NULL
2554 && (!htab->plt.has_plt0 || pltsec == NULL))
2557 if (bfd_link_pic (info))
2558 htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry;
2560 htab->plt.plt_entry = htab->non_lazy_plt->plt_entry;
2561 htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size;
2562 htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset;
2563 htab->plt.plt_got_insn_size
2564 = htab->non_lazy_plt->plt_got_insn_size;
2565 htab->plt.eh_frame_plt_size
2566 = htab->non_lazy_plt->eh_frame_plt_size;
2567 htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt;
2572 if (bfd_link_pic (info))
2574 htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry;
2575 htab->plt.plt_entry = htab->lazy_plt->pic_plt_entry;
2579 htab->plt.plt0_entry = htab->lazy_plt->plt0_entry;
2580 htab->plt.plt_entry = htab->lazy_plt->plt_entry;
2582 htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size;
2583 htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset;
2584 htab->plt.plt_got_insn_size
2585 = htab->lazy_plt->plt_got_insn_size;
2586 htab->plt.eh_frame_plt_size
2587 = htab->lazy_plt->eh_frame_plt_size;
2588 htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt;
2591 if (htab->target_os == is_vxworks
2592 && !elf_vxworks_create_dynamic_sections (dynobj, info,
2595 info->callbacks->einfo (_("%F%P: failed to create VxWorks dynamic sections\n"));
2599 /* Since create_dynamic_sections isn't always called, but GOT
2600 relocations need GOT relocations, create them here so that we
2601 don't need to do it in check_relocs. */
2602 if (htab->elf.sgot == NULL
2603 && !_bfd_elf_create_got_section (dynobj, info))
2604 info->callbacks->einfo (_("%F%P: failed to create GOT sections\n"));
2606 got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2;
2608 /* Align .got and .got.plt sections to their entry size. Do it here
2609 instead of in create_dynamic_sections so that they are always
2610 properly aligned even if create_dynamic_sections isn't called. */
2611 sec = htab->elf.sgot;
2612 if (!bfd_set_section_alignment (dynobj, sec, got_align))
2613 goto error_alignment;
2615 sec = htab->elf.sgotplt;
2616 if (!bfd_set_section_alignment (dynobj, sec, got_align))
2617 goto error_alignment;
2619 /* Create the ifunc sections here so that check_relocs can be
2621 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
2622 info->callbacks->einfo (_("%F%P: failed to create ifunc sections\n"));
2624 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
2628 /* Whe creating executable, set the contents of the .interp
2629 section to the interpreter. */
2630 if (bfd_link_executable (info) && !info->nointerp)
2632 asection *s = bfd_get_linker_section (dynobj, ".interp");
2635 s->size = htab->dynamic_interpreter_size;
2636 s->contents = (unsigned char *) htab->dynamic_interpreter;
2640 /* Don't change PLT section alignment for NaCl since it uses
2641 64-byte PLT entry and sets PLT section alignment to 32
2642 bytes. Don't create additional PLT sections for NaCl. */
2645 flagword pltflags = (bed->dynamic_sec_flags
2650 unsigned int non_lazy_plt_alignment
2651 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
2654 if (!bfd_set_section_alignment (sec->owner, sec,
2656 goto error_alignment;
2658 /* Create the GOT procedure linkage table. */
2659 sec = bfd_make_section_anyway_with_flags (dynobj,
2663 info->callbacks->einfo (_("%F%P: failed to create GOT PLT section\n"));
2665 if (!bfd_set_section_alignment (dynobj, sec,
2666 non_lazy_plt_alignment))
2667 goto error_alignment;
2669 htab->plt_got = sec;
2677 /* Create the second PLT for Intel IBT support. IBT
2678 PLT is supported only for non-NaCl target and is
2679 is needed only for lazy binding. */
2680 sec = bfd_make_section_anyway_with_flags (dynobj,
2684 info->callbacks->einfo (_("%F%P: failed to create IBT-enabled PLT section\n"));
2686 if (!bfd_set_section_alignment (dynobj, sec,
2688 goto error_alignment;
2690 else if (info->bndplt && ABI_64_P (dynobj))
2692 /* Create the second PLT for Intel MPX support. MPX
2693 PLT is supported only for non-NaCl target in 64-bit
2694 mode and is needed only for lazy binding. */
2695 sec = bfd_make_section_anyway_with_flags (dynobj,
2699 info->callbacks->einfo (_("%F%P: failed to create BND PLT section\n"));
2701 if (!bfd_set_section_alignment (dynobj, sec,
2702 non_lazy_plt_alignment))
2703 goto error_alignment;
2706 htab->plt_second = sec;
2710 if (!info->no_ld_generated_unwind_info)
2712 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2713 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2714 | SEC_LINKER_CREATED);
2716 sec = bfd_make_section_anyway_with_flags (dynobj,
2720 info->callbacks->einfo (_("%F%P: failed to create PLT .eh_frame section\n"));
2722 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2723 goto error_alignment;
2725 htab->plt_eh_frame = sec;
2727 if (htab->plt_got != NULL)
2729 sec = bfd_make_section_anyway_with_flags (dynobj,
2733 info->callbacks->einfo (_("%F%P: failed to create GOT PLT .eh_frame section\n"));
2735 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2736 goto error_alignment;
2738 htab->plt_got_eh_frame = sec;
2741 if (htab->plt_second != NULL)
2743 sec = bfd_make_section_anyway_with_flags (dynobj,
2747 info->callbacks->einfo (_("%F%P: failed to create the second PLT .eh_frame section\n"));
2749 if (!bfd_set_section_alignment (dynobj, sec, class_align))
2750 goto error_alignment;
2752 htab->plt_second_eh_frame = sec;
2759 /* The .iplt section is used for IFUNC symbols in static
2761 sec = htab->elf.iplt;
2763 && !bfd_set_section_alignment (sec->owner, sec,
2765 goto error_alignment;