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
;
184 /* If this is the first .plt entry, make room for the special
185 first entry. The .plt section is used by prelink to undo
186 prelinking for dynamic relocations. */
188 s
->size
= htab
->plt
.has_plt0
* plt_entry_size
;
191 eh
->plt_got
.offset
= got_s
->size
;
194 h
->plt
.offset
= s
->size
;
196 eh
->plt_second
.offset
= second_s
->size
;
199 /* If this symbol is not defined in a regular file, and we are
200 generating PDE, then set the symbol to this location in the
201 .plt. This is required to make function pointers compare
202 as equal between PDE and the shared library.
204 NB: If PLT is PC-relative, we can use the .plt in PIE for
208 else if (htab
->pcrel_plt
)
209 use_plt
= ! bfd_link_dll (info
);
211 use_plt
= bfd_link_pde (info
);
216 /* We need to make a call to the entry of the GOT PLT
217 instead of regular PLT entry. */
218 h
->root
.u
.def
.section
= got_s
;
219 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
225 /* We need to make a call to the entry of the
226 second PLT instead of regular PLT entry. */
227 h
->root
.u
.def
.section
= second_s
;
228 h
->root
.u
.def
.value
= eh
->plt_second
.offset
;
232 h
->root
.u
.def
.section
= s
;
233 h
->root
.u
.def
.value
= h
->plt
.offset
;
238 /* Make room for this entry. */
240 got_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
243 s
->size
+= plt_entry_size
;
245 second_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
247 /* We also need to make an entry in the .got.plt section,
248 which will be placed in the .got section by the linker
250 htab
->elf
.sgotplt
->size
+= htab
->got_entry_size
;
252 /* There should be no PLT relocation against resolved
253 undefined weak symbol in executable. */
254 if (!resolved_to_zero
)
256 /* We also need to make an entry in the .rel.plt
258 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
259 htab
->elf
.srelplt
->reloc_count
++;
263 if (htab
->target_os
== is_vxworks
&& !bfd_link_pic (info
))
265 /* VxWorks has a second set of relocations for each PLT entry
266 in executables. They go in a separate relocation section,
267 which is processed by the kernel loader. */
269 /* There are two relocations for the initial PLT entry: an
270 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
271 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
273 asection
*srelplt2
= htab
->srelplt2
;
274 if (h
->plt
.offset
== plt_entry_size
)
275 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
277 /* There are two extra relocations for each subsequent PLT entry:
278 an R_386_32 relocation for the GOT entry, and an R_386_32
279 relocation for the PLT entry. */
281 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
286 eh
->plt_got
.offset
= (bfd_vma
) -1;
287 h
->plt
.offset
= (bfd_vma
) -1;
293 eh
->plt_got
.offset
= (bfd_vma
) -1;
294 h
->plt
.offset
= (bfd_vma
) -1;
298 eh
->tlsdesc_got
= (bfd_vma
) -1;
300 /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the
301 binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For
302 x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
303 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
304 if (h
->got
.refcount
> 0
305 && bfd_link_executable (info
)
307 && (elf_x86_hash_entry (h
)->tls_type
& GOT_TLS_IE
))
308 h
->got
.offset
= (bfd_vma
) -1;
309 else if (h
->got
.refcount
> 0)
313 int tls_type
= elf_x86_hash_entry (h
)->tls_type
;
315 /* Make sure this symbol is output as a dynamic symbol.
316 Undefined weak syms won't yet be marked as dynamic. */
320 && h
->root
.type
== bfd_link_hash_undefweak
)
322 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
327 if (GOT_TLS_GDESC_P (tls_type
))
329 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
330 - elf_x86_compute_jump_table_size (htab
);
331 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
332 h
->got
.offset
= (bfd_vma
) -2;
334 if (! GOT_TLS_GDESC_P (tls_type
)
335 || GOT_TLS_GD_P (tls_type
))
337 h
->got
.offset
= s
->size
;
338 s
->size
+= htab
->got_entry_size
;
339 /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
341 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
342 s
->size
+= htab
->got_entry_size
;
344 dyn
= htab
->elf
.dynamic_sections_created
;
345 /* R_386_TLS_IE_32 needs one dynamic relocation,
346 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
347 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
348 need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local
349 symbol and two if global. No dynamic relocation against
350 resolved undefined weak symbol in executable. */
351 if (tls_type
== GOT_TLS_IE_BOTH
)
352 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
353 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
354 || (tls_type
& GOT_TLS_IE
))
355 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
356 else if (GOT_TLS_GD_P (tls_type
))
357 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
358 else if (! GOT_TLS_GDESC_P (tls_type
)
359 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
360 && !resolved_to_zero
)
361 || h
->root
.type
!= bfd_link_hash_undefweak
)
362 && (bfd_link_pic (info
)
363 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
364 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
365 if (GOT_TLS_GDESC_P (tls_type
))
367 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
368 if (bed
->target_id
== X86_64_ELF_DATA
)
369 htab
->tlsdesc_plt
= (bfd_vma
) -1;
373 h
->got
.offset
= (bfd_vma
) -1;
375 if (eh
->dyn_relocs
== NULL
)
378 /* In the shared -Bsymbolic case, discard space allocated for
379 dynamic pc-relative relocs against symbols which turn out to be
380 defined in regular objects. For the normal shared case, discard
381 space for pc-relative relocs that have become local due to symbol
382 visibility changes. */
384 if (bfd_link_pic (info
))
386 /* Relocs that use pc_count are those that appear on a call
387 insn, or certain REL relocs that can generated via assembly.
388 We want calls to protected symbols to resolve directly to the
389 function rather than going via the plt. If people want
390 function pointer comparisons to work as expected then they
391 should avoid writing weird assembly. */
392 if (SYMBOL_CALLS_LOCAL (info
, h
))
394 struct elf_dyn_relocs
**pp
;
396 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
398 p
->count
-= p
->pc_count
;
407 if (htab
->target_os
== is_vxworks
)
409 struct elf_dyn_relocs
**pp
;
410 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
412 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
419 /* Also discard relocs on undefined weak syms with non-default
420 visibility or in PIE. */
421 if (eh
->dyn_relocs
!= NULL
)
423 if (h
->root
.type
== bfd_link_hash_undefweak
)
425 /* Undefined weak symbol is never bound locally in shared
427 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
430 if (bed
->target_id
== I386_ELF_DATA
433 /* Keep dynamic non-GOT/non-PLT relocation so
434 that we can branch to 0 without PLT. */
435 struct elf_dyn_relocs
**pp
;
437 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
438 if (p
->pc_count
== 0)
442 /* Remove non-R_386_PC32 relocation. */
443 p
->count
= p
->pc_count
;
447 /* Make sure undefined weak symbols are output
448 as dynamic symbols in PIEs for dynamic non-GOT
449 non-PLT reloations. */
450 if (eh
->dyn_relocs
!= NULL
451 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
455 eh
->dyn_relocs
= NULL
;
457 else if (h
->dynindx
== -1
459 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
462 else if (bfd_link_executable (info
)
463 && (h
->needs_copy
|| eh
->needs_copy
)
467 /* NB: needs_copy is set only for x86-64. For PIE,
468 discard space for pc-relative relocs against symbols
469 which turn out to need copy relocs. */
470 struct elf_dyn_relocs
**pp
;
472 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
474 if (p
->pc_count
!= 0)
482 else if (ELIMINATE_COPY_RELOCS
)
484 /* For the non-shared case, discard space for relocs against
485 symbols which turn out to need copy relocs or are not
486 dynamic. Keep dynamic relocations for run-time function
487 pointer initialization. */
490 || (h
->root
.type
== bfd_link_hash_undefweak
491 && !resolved_to_zero
))
494 || (htab
->elf
.dynamic_sections_created
495 && (h
->root
.type
== bfd_link_hash_undefweak
496 || h
->root
.type
== bfd_link_hash_undefined
))))
498 /* Make sure this symbol is output as a dynamic symbol.
499 Undefined weak syms won't yet be marked as dynamic. */
503 && h
->root
.type
== bfd_link_hash_undefweak
504 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
507 /* If that succeeded, we know we'll be keeping all the
509 if (h
->dynindx
!= -1)
513 eh
->dyn_relocs
= NULL
;
518 /* Finally, allocate space. */
519 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
523 sreloc
= elf_section_data (p
->sec
)->sreloc
;
525 BFD_ASSERT (sreloc
!= NULL
);
526 sreloc
->size
+= p
->count
* htab
->sizeof_reloc
;
532 /* Find dynamic relocs for H that apply to read-only sections. */
535 readonly_dynrelocs (struct elf_link_hash_entry
*h
)
537 struct elf_dyn_relocs
*p
;
539 for (p
= elf_x86_hash_entry (h
)->dyn_relocs
; p
!= NULL
; p
= p
->next
)
541 asection
*s
= p
->sec
->output_section
;
543 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
549 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
550 read-only sections. */
553 maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
557 if (h
->root
.type
== bfd_link_hash_indirect
)
560 /* Skip local IFUNC symbols. */
561 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
564 sec
= readonly_dynrelocs (h
);
567 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
569 info
->flags
|= DF_TEXTREL
;
570 /* xgettext:c-format */
571 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
572 "in read-only section `%pA'\n"),
573 sec
->owner
, h
->root
.root
.string
, sec
);
575 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
576 || info
->error_textrel
)
577 /* xgettext:c-format */
578 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
579 "in read-only section `%pA'\n"),
580 sec
->owner
, h
->root
.root
.string
, sec
);
582 /* Not an error, just cut short the traversal. */
588 /* Allocate space in .plt, .got and associated reloc sections for
589 local dynamic relocs. */
592 elf_x86_allocate_local_dynreloc (void **slot
, void *inf
)
594 struct elf_link_hash_entry
*h
595 = (struct elf_link_hash_entry
*) *slot
;
597 if (h
->type
!= STT_GNU_IFUNC
601 || h
->root
.type
!= bfd_link_hash_defined
)
604 return elf_x86_allocate_dynrelocs (h
, inf
);
607 /* Find and/or create a hash entry for local symbol. */
609 struct elf_link_hash_entry
*
610 _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table
*htab
,
611 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
614 struct elf_x86_link_hash_entry e
, *ret
;
615 asection
*sec
= abfd
->sections
;
616 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
617 htab
->r_sym (rel
->r_info
));
620 e
.elf
.indx
= sec
->id
;
621 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
622 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
623 create
? INSERT
: NO_INSERT
);
630 ret
= (struct elf_x86_link_hash_entry
*) *slot
;
634 ret
= (struct elf_x86_link_hash_entry
*)
635 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
636 sizeof (struct elf_x86_link_hash_entry
));
639 memset (ret
, 0, sizeof (*ret
));
640 ret
->elf
.indx
= sec
->id
;
641 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
642 ret
->elf
.dynindx
= -1;
643 ret
->plt_got
.offset
= (bfd_vma
) -1;
649 /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN
650 SYNC WITH _bfd_elf_link_hash_newfunc. */
652 struct bfd_hash_entry
*
653 _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
654 struct bfd_hash_table
*table
,
657 /* Allocate the structure if it has not already been allocated by a
661 entry
= (struct bfd_hash_entry
*)
662 bfd_hash_allocate (table
,
663 sizeof (struct elf_x86_link_hash_entry
));
668 /* Call the allocation method of the superclass. */
669 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
672 struct elf_x86_link_hash_entry
*eh
673 = (struct elf_x86_link_hash_entry
*) entry
;
674 struct elf_link_hash_table
*htab
675 = (struct elf_link_hash_table
*) table
;
677 memset (&eh
->elf
.size
, 0,
678 (sizeof (struct elf_x86_link_hash_entry
)
679 - offsetof (struct elf_link_hash_entry
, size
)));
680 /* Set local fields. */
682 eh
->elf
.dynindx
= -1;
683 eh
->elf
.got
= htab
->init_got_refcount
;
684 eh
->elf
.plt
= htab
->init_plt_refcount
;
685 /* Assume that we have been called by a non-ELF symbol reader.
686 This flag is then reset by the code which reads an ELF input
687 file. This ensures that a symbol created by a non-ELF symbol
688 reader will have the flag set correctly. */
690 eh
->plt_second
.offset
= (bfd_vma
) -1;
691 eh
->plt_got
.offset
= (bfd_vma
) -1;
692 eh
->tlsdesc_got
= (bfd_vma
) -1;
693 eh
->zero_undefweak
= 1;
699 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
700 for local symbol so that we can handle local STT_GNU_IFUNC symbols
701 as global symbol. We reuse indx and dynstr_index for local symbol
702 hash since they aren't used by global symbols in this backend. */
705 _bfd_x86_elf_local_htab_hash (const void *ptr
)
707 struct elf_link_hash_entry
*h
708 = (struct elf_link_hash_entry
*) ptr
;
709 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
712 /* Compare local hash entries. */
715 _bfd_x86_elf_local_htab_eq (const void *ptr1
, const void *ptr2
)
717 struct elf_link_hash_entry
*h1
718 = (struct elf_link_hash_entry
*) ptr1
;
719 struct elf_link_hash_entry
*h2
720 = (struct elf_link_hash_entry
*) ptr2
;
722 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
725 /* Destroy an x86 ELF linker hash table. */
728 elf_x86_link_hash_table_free (bfd
*obfd
)
730 struct elf_x86_link_hash_table
*htab
731 = (struct elf_x86_link_hash_table
*) obfd
->link
.hash
;
733 if (htab
->loc_hash_table
)
734 htab_delete (htab
->loc_hash_table
);
735 if (htab
->loc_hash_memory
)
736 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
737 _bfd_elf_link_hash_table_free (obfd
);
741 elf_i386_is_reloc_section (const char *secname
)
743 return CONST_STRNEQ (secname
, ".rel");
747 elf_x86_64_is_reloc_section (const char *secname
)
749 return CONST_STRNEQ (secname
, ".rela");
752 /* Create an x86 ELF linker hash table. */
754 struct bfd_link_hash_table
*
755 _bfd_x86_elf_link_hash_table_create (bfd
*abfd
)
757 struct elf_x86_link_hash_table
*ret
;
758 const struct elf_backend_data
*bed
;
759 bfd_size_type amt
= sizeof (struct elf_x86_link_hash_table
);
761 ret
= (struct elf_x86_link_hash_table
*) bfd_zmalloc (amt
);
765 bed
= get_elf_backend_data (abfd
);
766 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
767 _bfd_x86_elf_link_hash_newfunc
,
768 sizeof (struct elf_x86_link_hash_entry
),
775 if (bed
->target_id
== X86_64_ELF_DATA
)
777 ret
->is_reloc_section
= elf_x86_64_is_reloc_section
;
778 ret
->dt_reloc
= DT_RELA
;
779 ret
->dt_reloc_sz
= DT_RELASZ
;
780 ret
->dt_reloc_ent
= DT_RELAENT
;
781 ret
->got_entry_size
= 8;
782 ret
->pcrel_plt
= TRUE
;
783 ret
->tls_get_addr
= "__tls_get_addr";
787 ret
->sizeof_reloc
= sizeof (Elf64_External_Rela
);
788 ret
->pointer_r_type
= R_X86_64_64
;
789 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
790 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
794 if (bed
->target_id
== X86_64_ELF_DATA
)
796 ret
->sizeof_reloc
= sizeof (Elf32_External_Rela
);
797 ret
->pointer_r_type
= R_X86_64_32
;
798 ret
->dynamic_interpreter
= ELFX32_DYNAMIC_INTERPRETER
;
799 ret
->dynamic_interpreter_size
800 = sizeof ELFX32_DYNAMIC_INTERPRETER
;
804 ret
->is_reloc_section
= elf_i386_is_reloc_section
;
805 ret
->dt_reloc
= DT_REL
;
806 ret
->dt_reloc_sz
= DT_RELSZ
;
807 ret
->dt_reloc_ent
= DT_RELENT
;
808 ret
->sizeof_reloc
= sizeof (Elf32_External_Rel
);
809 ret
->got_entry_size
= 4;
810 ret
->pcrel_plt
= FALSE
;
811 ret
->pointer_r_type
= R_386_32
;
812 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
813 ret
->dynamic_interpreter_size
814 = sizeof ELF32_DYNAMIC_INTERPRETER
;
815 ret
->tls_get_addr
= "___tls_get_addr";
818 ret
->target_id
= bed
->target_id
;
819 ret
->target_os
= get_elf_x86_backend_data (abfd
)->target_os
;
821 ret
->loc_hash_table
= htab_try_create (1024,
822 _bfd_x86_elf_local_htab_hash
,
823 _bfd_x86_elf_local_htab_eq
,
825 ret
->loc_hash_memory
= objalloc_create ();
826 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
828 elf_x86_link_hash_table_free (abfd
);
831 ret
->elf
.root
.hash_table_free
= elf_x86_link_hash_table_free
;
833 return &ret
->elf
.root
;
836 /* Sort relocs into address order. */
839 _bfd_x86_elf_compare_relocs (const void *ap
, const void *bp
)
841 const arelent
*a
= * (const arelent
**) ap
;
842 const arelent
*b
= * (const arelent
**) bp
;
844 if (a
->address
> b
->address
)
846 else if (a
->address
< b
->address
)
853 _bfd_x86_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
855 if (!bfd_link_relocatable (info
))
857 /* Check for __tls_get_addr reference. */
858 struct elf_x86_link_hash_table
*htab
;
859 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
860 htab
= elf_x86_hash_table (info
, bed
->target_id
);
863 struct elf_link_hash_entry
*h
;
865 h
= elf_link_hash_lookup (elf_hash_table (info
),
867 FALSE
, FALSE
, FALSE
);
870 elf_x86_hash_entry (h
)->tls_get_addr
= 1;
872 /* Check the versioned __tls_get_addr symbol. */
873 while (h
->root
.type
== bfd_link_hash_indirect
)
875 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
876 elf_x86_hash_entry (h
)->tls_get_addr
= 1;
880 /* "__ehdr_start" will be defined by linker as a hidden symbol
881 later if it is referenced and not defined. */
882 h
= elf_link_hash_lookup (elf_hash_table (info
),
884 FALSE
, FALSE
, FALSE
);
886 && (h
->root
.type
== bfd_link_hash_new
887 || h
->root
.type
== bfd_link_hash_undefined
888 || h
->root
.type
== bfd_link_hash_undefweak
889 || h
->root
.type
== bfd_link_hash_common
))
891 elf_x86_hash_entry (h
)->local_ref
= 2;
892 elf_x86_hash_entry (h
)->linker_def
= 1;
897 /* Invoke the regular ELF backend linker to do all the work. */
898 return _bfd_elf_link_check_relocs (abfd
, info
);
901 /* Set the sizes of the dynamic sections. */
904 _bfd_x86_elf_size_dynamic_sections (bfd
*output_bfd
,
905 struct bfd_link_info
*info
)
907 struct elf_x86_link_hash_table
*htab
;
912 const struct elf_backend_data
*bed
913 = get_elf_backend_data (output_bfd
);
915 htab
= elf_x86_hash_table (info
, bed
->target_id
);
918 dynobj
= htab
->elf
.dynobj
;
922 /* Set up .got offsets for local syms, and space for local dynamic
924 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
926 bfd_signed_vma
*local_got
;
927 bfd_signed_vma
*end_local_got
;
928 char *local_tls_type
;
929 bfd_vma
*local_tlsdesc_gotent
;
930 bfd_size_type locsymcount
;
931 Elf_Internal_Shdr
*symtab_hdr
;
934 if (! is_x86_elf (ibfd
, htab
))
937 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
939 struct elf_dyn_relocs
*p
;
941 for (p
= ((struct elf_dyn_relocs
*)
942 elf_section_data (s
)->local_dynrel
);
946 if (!bfd_is_abs_section (p
->sec
)
947 && bfd_is_abs_section (p
->sec
->output_section
))
949 /* Input section has been discarded, either because
950 it is a copy of a linkonce section or due to
951 linker script /DISCARD/, so we'll be discarding
954 else if (htab
->target_os
== is_vxworks
955 && strcmp (p
->sec
->output_section
->name
,
958 /* Relocations in vxworks .tls_vars sections are
959 handled specially by the loader. */
961 else if (p
->count
!= 0)
963 srel
= elf_section_data (p
->sec
)->sreloc
;
964 srel
->size
+= p
->count
* htab
->sizeof_reloc
;
965 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
966 && (info
->flags
& DF_TEXTREL
) == 0)
968 info
->flags
|= DF_TEXTREL
;
969 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
970 || info
->error_textrel
)
971 /* xgettext:c-format */
972 info
->callbacks
->einfo
973 (_("%P: %pB: warning: relocation "
974 "in read-only section `%pA'\n"),
975 p
->sec
->owner
, p
->sec
);
981 local_got
= elf_local_got_refcounts (ibfd
);
985 symtab_hdr
= &elf_symtab_hdr (ibfd
);
986 locsymcount
= symtab_hdr
->sh_info
;
987 end_local_got
= local_got
+ locsymcount
;
988 local_tls_type
= elf_x86_local_got_tls_type (ibfd
);
989 local_tlsdesc_gotent
= elf_x86_local_tlsdesc_gotent (ibfd
);
991 srel
= htab
->elf
.srelgot
;
992 for (; local_got
< end_local_got
;
993 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
995 *local_tlsdesc_gotent
= (bfd_vma
) -1;
998 if (GOT_TLS_GDESC_P (*local_tls_type
))
1000 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
1001 - elf_x86_compute_jump_table_size (htab
);
1002 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
1003 *local_got
= (bfd_vma
) -2;
1005 if (! GOT_TLS_GDESC_P (*local_tls_type
)
1006 || GOT_TLS_GD_P (*local_tls_type
))
1008 *local_got
= s
->size
;
1009 s
->size
+= htab
->got_entry_size
;
1010 if (GOT_TLS_GD_P (*local_tls_type
)
1011 || *local_tls_type
== GOT_TLS_IE_BOTH
)
1012 s
->size
+= htab
->got_entry_size
;
1014 if (bfd_link_pic (info
)
1015 || GOT_TLS_GD_ANY_P (*local_tls_type
)
1016 || (*local_tls_type
& GOT_TLS_IE
))
1018 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
1019 srel
->size
+= 2 * htab
->sizeof_reloc
;
1020 else if (GOT_TLS_GD_P (*local_tls_type
)
1021 || ! GOT_TLS_GDESC_P (*local_tls_type
))
1022 srel
->size
+= htab
->sizeof_reloc
;
1023 if (GOT_TLS_GDESC_P (*local_tls_type
))
1025 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
1026 if (bed
->target_id
== X86_64_ELF_DATA
)
1027 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1032 *local_got
= (bfd_vma
) -1;
1036 if (htab
->tls_ld_or_ldm_got
.refcount
> 0)
1038 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1039 or R_X86_64_TLSLD relocs. */
1040 htab
->tls_ld_or_ldm_got
.offset
= htab
->elf
.sgot
->size
;
1041 htab
->elf
.sgot
->size
+= 2 * htab
->got_entry_size
;
1042 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
1045 htab
->tls_ld_or_ldm_got
.offset
= -1;
1047 /* Allocate global sym .plt and .got entries, and space for global
1048 sym dynamic relocs. */
1049 elf_link_hash_traverse (&htab
->elf
, elf_x86_allocate_dynrelocs
,
1052 /* Allocate .plt and .got entries, and space for local symbols. */
1053 htab_traverse (htab
->loc_hash_table
, elf_x86_allocate_local_dynreloc
,
1056 /* For every jump slot reserved in the sgotplt, reloc_count is
1057 incremented. However, when we reserve space for TLS descriptors,
1058 it's not incremented, so in order to compute the space reserved
1059 for them, it suffices to multiply the reloc count by the jump
1062 PR ld/13302: We start next_irelative_index at the end of .rela.plt
1063 so that R_{386,X86_64}_IRELATIVE entries come last. */
1064 if (htab
->elf
.srelplt
)
1066 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
1067 htab
->sgotplt_jump_table_size
1068 = elf_x86_compute_jump_table_size (htab
);
1069 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
1071 else if (htab
->elf
.irelplt
)
1072 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
1074 if (htab
->tlsdesc_plt
)
1076 /* NB: tlsdesc_plt is set only for x86-64. If we're not using
1077 lazy TLS relocations, don't generate the PLT and GOT entries
1079 if ((info
->flags
& DF_BIND_NOW
))
1080 htab
->tlsdesc_plt
= 0;
1083 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
1084 htab
->elf
.sgot
->size
+= htab
->got_entry_size
;
1085 /* Reserve room for the initial entry.
1086 FIXME: we could probably do away with it in this case. */
1087 if (htab
->elf
.splt
->size
== 0)
1088 htab
->elf
.splt
->size
= htab
->plt
.plt_entry_size
;
1089 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
1090 htab
->elf
.splt
->size
+= htab
->plt
.plt_entry_size
;
1094 if (htab
->elf
.sgotplt
)
1096 /* Don't allocate .got.plt section if there are no GOT nor PLT
1097 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
1098 if ((htab
->elf
.hgot
== NULL
1099 || !htab
->got_referenced
)
1100 && (htab
->elf
.sgotplt
->size
== bed
->got_header_size
)
1101 && (htab
->elf
.splt
== NULL
1102 || htab
->elf
.splt
->size
== 0)
1103 && (htab
->elf
.sgot
== NULL
1104 || htab
->elf
.sgot
->size
== 0)
1105 && (htab
->elf
.iplt
== NULL
1106 || htab
->elf
.iplt
->size
== 0)
1107 && (htab
->elf
.igotplt
== NULL
1108 || htab
->elf
.igotplt
->size
== 0))
1110 htab
->elf
.sgotplt
->size
= 0;
1111 /* Solaris requires to keep _GLOBAL_OFFSET_TABLE_ even if it
1113 if (htab
->elf
.hgot
!= NULL
&& htab
->target_os
!= is_solaris
)
1115 /* Remove the unused _GLOBAL_OFFSET_TABLE_ from symbol
1117 htab
->elf
.hgot
->root
.type
= bfd_link_hash_undefined
;
1118 htab
->elf
.hgot
->root
.u
.undef
.abfd
1119 = htab
->elf
.hgot
->root
.u
.def
.section
->owner
;
1120 htab
->elf
.hgot
->root
.linker_def
= 0;
1121 htab
->elf
.hgot
->ref_regular
= 0;
1122 htab
->elf
.hgot
->def_regular
= 0;
1127 if (_bfd_elf_eh_frame_present (info
))
1129 if (htab
->plt_eh_frame
!= NULL
1130 && htab
->elf
.splt
!= NULL
1131 && htab
->elf
.splt
->size
!= 0
1132 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
1133 htab
->plt_eh_frame
->size
= htab
->plt
.eh_frame_plt_size
;
1135 if (htab
->plt_got_eh_frame
!= NULL
1136 && htab
->plt_got
!= NULL
1137 && htab
->plt_got
->size
!= 0
1138 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
1139 htab
->plt_got_eh_frame
->size
1140 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1142 /* Unwind info for the second PLT and .plt.got sections are
1144 if (htab
->plt_second_eh_frame
!= NULL
1145 && htab
->plt_second
!= NULL
1146 && htab
->plt_second
->size
!= 0
1147 && !bfd_is_abs_section (htab
->plt_second
->output_section
))
1148 htab
->plt_second_eh_frame
->size
1149 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1152 /* We now have determined the sizes of the various dynamic sections.
1153 Allocate memory for them. */
1155 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1157 bfd_boolean strip_section
= TRUE
;
1159 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1162 if (s
== htab
->elf
.splt
1163 || s
== htab
->elf
.sgot
)
1165 /* Strip this section if we don't need it; see the
1167 /* We'd like to strip these sections if they aren't needed, but if
1168 we've exported dynamic symbols from them we must leave them.
1169 It's too late to tell BFD to get rid of the symbols. */
1171 if (htab
->elf
.hplt
!= NULL
)
1172 strip_section
= FALSE
;
1174 else if (s
== htab
->elf
.sgotplt
1175 || s
== htab
->elf
.iplt
1176 || s
== htab
->elf
.igotplt
1177 || s
== htab
->plt_second
1178 || s
== htab
->plt_got
1179 || s
== htab
->plt_eh_frame
1180 || s
== htab
->plt_got_eh_frame
1181 || s
== htab
->plt_second_eh_frame
1182 || s
== htab
->elf
.sdynbss
1183 || s
== htab
->elf
.sdynrelro
)
1185 /* Strip these too. */
1187 else if (htab
->is_reloc_section (bfd_get_section_name (dynobj
, s
)))
1190 && s
!= htab
->elf
.srelplt
1191 && s
!= htab
->srelplt2
)
1194 /* We use the reloc_count field as a counter if we need
1195 to copy relocs into the output file. */
1196 if (s
!= htab
->elf
.srelplt
)
1201 /* It's not one of our sections, so don't allocate space. */
1207 /* If we don't need this section, strip it from the
1208 output file. This is mostly to handle .rel.bss and
1209 .rel.plt. We must create both sections in
1210 create_dynamic_sections, because they must be created
1211 before the linker maps input sections to output
1212 sections. The linker does that before
1213 adjust_dynamic_symbol is called, and it is that
1214 function which decides whether anything needs to go
1215 into these sections. */
1217 s
->flags
|= SEC_EXCLUDE
;
1221 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1224 /* Allocate memory for the section contents. We use bfd_zalloc
1225 here in case unused entries are not reclaimed before the
1226 section's contents are written out. This should not happen,
1227 but this way if it does, we get a R_386_NONE or R_X86_64_NONE
1228 reloc instead of garbage. */
1229 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
1230 if (s
->contents
== NULL
)
1234 if (htab
->plt_eh_frame
!= NULL
1235 && htab
->plt_eh_frame
->contents
!= NULL
)
1237 memcpy (htab
->plt_eh_frame
->contents
,
1238 htab
->plt
.eh_frame_plt
,
1239 htab
->plt_eh_frame
->size
);
1240 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
1241 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
1244 if (htab
->plt_got_eh_frame
!= NULL
1245 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1247 memcpy (htab
->plt_got_eh_frame
->contents
,
1248 htab
->non_lazy_plt
->eh_frame_plt
,
1249 htab
->plt_got_eh_frame
->size
);
1250 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
1251 (htab
->plt_got_eh_frame
->contents
1252 + PLT_FDE_LEN_OFFSET
));
1255 if (htab
->plt_second_eh_frame
!= NULL
1256 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1258 memcpy (htab
->plt_second_eh_frame
->contents
,
1259 htab
->non_lazy_plt
->eh_frame_plt
,
1260 htab
->plt_second_eh_frame
->size
);
1261 bfd_put_32 (dynobj
, htab
->plt_second
->size
,
1262 (htab
->plt_second_eh_frame
->contents
1263 + PLT_FDE_LEN_OFFSET
));
1266 if (htab
->elf
.dynamic_sections_created
)
1268 /* Add some entries to the .dynamic section. We fill in the
1269 values later, in elf_{i386,x86_64}_finish_dynamic_sections,
1270 but we must add the entries now so that we get the correct
1271 size for the .dynamic section. The DT_DEBUG entry is filled
1272 in by the dynamic linker and used by the debugger. */
1273 #define add_dynamic_entry(TAG, VAL) \
1274 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1276 if (bfd_link_executable (info
))
1278 if (!add_dynamic_entry (DT_DEBUG
, 0))
1282 if (htab
->elf
.splt
->size
!= 0)
1284 /* DT_PLTGOT is used by prelink even if there is no PLT
1286 if (!add_dynamic_entry (DT_PLTGOT
, 0))
1290 if (htab
->elf
.srelplt
->size
!= 0)
1292 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
1293 || !add_dynamic_entry (DT_PLTREL
, htab
->dt_reloc
)
1294 || !add_dynamic_entry (DT_JMPREL
, 0))
1298 if (htab
->tlsdesc_plt
1299 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
1300 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
1305 if (!add_dynamic_entry (htab
->dt_reloc
, 0)
1306 || !add_dynamic_entry (htab
->dt_reloc_sz
, 0)
1307 || !add_dynamic_entry (htab
->dt_reloc_ent
,
1308 htab
->sizeof_reloc
))
1311 /* If any dynamic relocs apply to a read-only section,
1312 then we need a DT_TEXTREL entry. */
1313 if ((info
->flags
& DF_TEXTREL
) == 0)
1314 elf_link_hash_traverse (&htab
->elf
, maybe_set_textrel
, info
);
1316 if ((info
->flags
& DF_TEXTREL
) != 0)
1318 if (htab
->readonly_dynrelocs_against_ifunc
)
1320 info
->callbacks
->einfo
1321 (_("%P%X: read-only segment has dynamic IFUNC relocations;"
1322 " recompile with -fPIC\n"));
1323 bfd_set_error (bfd_error_bad_value
);
1327 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1331 if (htab
->target_os
== is_vxworks
1332 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
1335 #undef add_dynamic_entry
1340 /* Finish up the x86 dynamic sections. */
1342 struct elf_x86_link_hash_table
*
1343 _bfd_x86_elf_finish_dynamic_sections (bfd
*output_bfd
,
1344 struct bfd_link_info
*info
)
1346 struct elf_x86_link_hash_table
*htab
;
1347 const struct elf_backend_data
*bed
;
1350 bfd_byte
*dyncon
, *dynconend
;
1351 bfd_size_type sizeof_dyn
;
1353 bed
= get_elf_backend_data (output_bfd
);
1354 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1358 dynobj
= htab
->elf
.dynobj
;
1359 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
1361 /* GOT is always created in setup_gnu_properties. But it may not be
1362 needed. .got.plt section may be needed for static IFUNC. */
1363 if (htab
->elf
.sgotplt
&& htab
->elf
.sgotplt
->size
> 0)
1365 bfd_vma dynamic_addr
;
1367 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
1370 (_("discarded output section: `%pA'"), htab
->elf
.sgotplt
);
1374 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
1375 = htab
->got_entry_size
;
1377 dynamic_addr
= (sdyn
== NULL
1379 : sdyn
->output_section
->vma
+ sdyn
->output_offset
);
1381 /* Set the first entry in the global offset table to the address
1382 of the dynamic section. Write GOT[1] and GOT[2], needed for
1383 the dynamic linker. */
1384 if (htab
->got_entry_size
== 8)
1386 bfd_put_64 (output_bfd
, dynamic_addr
,
1387 htab
->elf
.sgotplt
->contents
);
1388 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
1389 htab
->elf
.sgotplt
->contents
+ 8);
1390 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
1391 htab
->elf
.sgotplt
->contents
+ 8*2);
1395 bfd_put_32 (output_bfd
, dynamic_addr
,
1396 htab
->elf
.sgotplt
->contents
);
1397 bfd_put_32 (output_bfd
, 0,
1398 htab
->elf
.sgotplt
->contents
+ 4);
1399 bfd_put_32 (output_bfd
, 0,
1400 htab
->elf
.sgotplt
->contents
+ 4*2);
1404 if (!htab
->elf
.dynamic_sections_created
)
1407 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
1410 sizeof_dyn
= bed
->s
->sizeof_dyn
;
1411 dyncon
= sdyn
->contents
;
1412 dynconend
= sdyn
->contents
+ sdyn
->size
;
1413 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
1415 Elf_Internal_Dyn dyn
;
1418 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
1423 if (htab
->target_os
== is_vxworks
1424 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
1429 s
= htab
->elf
.sgotplt
;
1430 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
1434 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
1438 s
= htab
->elf
.srelplt
->output_section
;
1439 dyn
.d_un
.d_val
= s
->size
;
1442 case DT_TLSDESC_PLT
:
1444 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
1445 + htab
->tlsdesc_plt
;
1448 case DT_TLSDESC_GOT
:
1450 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
1451 + htab
->tlsdesc_got
;
1455 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
1458 if (htab
->plt_got
!= NULL
&& htab
->plt_got
->size
> 0)
1459 elf_section_data (htab
->plt_got
->output_section
)
1460 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
1462 if (htab
->plt_second
!= NULL
&& htab
->plt_second
->size
> 0)
1463 elf_section_data (htab
->plt_second
->output_section
)
1464 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
1466 /* Adjust .eh_frame for .plt section. */
1467 if (htab
->plt_eh_frame
!= NULL
1468 && htab
->plt_eh_frame
->contents
!= NULL
)
1470 if (htab
->elf
.splt
!= NULL
1471 && htab
->elf
.splt
->size
!= 0
1472 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
1473 && htab
->elf
.splt
->output_section
!= NULL
1474 && htab
->plt_eh_frame
->output_section
!= NULL
)
1476 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
1477 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
1478 + htab
->plt_eh_frame
->output_offset
1479 + PLT_FDE_START_OFFSET
;
1480 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1481 htab
->plt_eh_frame
->contents
1482 + PLT_FDE_START_OFFSET
);
1485 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
1487 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1489 htab
->plt_eh_frame
->contents
))
1494 /* Adjust .eh_frame for .plt.got section. */
1495 if (htab
->plt_got_eh_frame
!= NULL
1496 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1498 if (htab
->plt_got
!= NULL
1499 && htab
->plt_got
->size
!= 0
1500 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
1501 && htab
->plt_got
->output_section
!= NULL
1502 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
1504 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
1505 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
1506 + htab
->plt_got_eh_frame
->output_offset
1507 + PLT_FDE_START_OFFSET
;
1508 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1509 htab
->plt_got_eh_frame
->contents
1510 + PLT_FDE_START_OFFSET
);
1512 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
1514 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1515 htab
->plt_got_eh_frame
,
1516 htab
->plt_got_eh_frame
->contents
))
1521 /* Adjust .eh_frame for the second PLT section. */
1522 if (htab
->plt_second_eh_frame
!= NULL
1523 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1525 if (htab
->plt_second
!= NULL
1526 && htab
->plt_second
->size
!= 0
1527 && (htab
->plt_second
->flags
& SEC_EXCLUDE
) == 0
1528 && htab
->plt_second
->output_section
!= NULL
1529 && htab
->plt_second_eh_frame
->output_section
!= NULL
)
1531 bfd_vma plt_start
= htab
->plt_second
->output_section
->vma
;
1532 bfd_vma eh_frame_start
1533 = (htab
->plt_second_eh_frame
->output_section
->vma
1534 + htab
->plt_second_eh_frame
->output_offset
1535 + PLT_FDE_START_OFFSET
);
1536 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1537 htab
->plt_second_eh_frame
->contents
1538 + PLT_FDE_START_OFFSET
);
1540 if (htab
->plt_second_eh_frame
->sec_info_type
1541 == SEC_INFO_TYPE_EH_FRAME
)
1543 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1544 htab
->plt_second_eh_frame
,
1545 htab
->plt_second_eh_frame
->contents
))
1550 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
1551 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
1552 = htab
->got_entry_size
;
1559 _bfd_x86_elf_always_size_sections (bfd
*output_bfd
,
1560 struct bfd_link_info
*info
)
1562 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
1566 struct elf_link_hash_entry
*tlsbase
;
1568 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
1569 "_TLS_MODULE_BASE_",
1570 FALSE
, FALSE
, FALSE
);
1572 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
1574 struct elf_x86_link_hash_table
*htab
;
1575 struct bfd_link_hash_entry
*bh
= NULL
;
1576 const struct elf_backend_data
*bed
1577 = get_elf_backend_data (output_bfd
);
1579 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1583 if (!(_bfd_generic_link_add_one_symbol
1584 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1585 tls_sec
, 0, NULL
, FALSE
,
1586 bed
->collect
, &bh
)))
1589 htab
->tls_module_base
= bh
;
1591 tlsbase
= (struct elf_link_hash_entry
*)bh
;
1592 tlsbase
->def_regular
= 1;
1593 tlsbase
->other
= STV_HIDDEN
;
1594 tlsbase
->root
.linker_def
= 1;
1595 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1603 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
1604 const Elf_Internal_Sym
*isym
,
1605 bfd_boolean definition
,
1606 bfd_boolean dynamic ATTRIBUTE_UNUSED
)
1610 struct elf_x86_link_hash_entry
*eh
1611 = (struct elf_x86_link_hash_entry
*) h
;
1612 eh
->def_protected
= (ELF_ST_VISIBILITY (isym
->st_other
)
1617 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1620 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info
*info
,
1621 struct elf_link_hash_entry
*dir
,
1622 struct elf_link_hash_entry
*ind
)
1624 struct elf_x86_link_hash_entry
*edir
, *eind
;
1626 edir
= (struct elf_x86_link_hash_entry
*) dir
;
1627 eind
= (struct elf_x86_link_hash_entry
*) ind
;
1629 if (eind
->dyn_relocs
!= NULL
)
1631 if (edir
->dyn_relocs
!= NULL
)
1633 struct elf_dyn_relocs
**pp
;
1634 struct elf_dyn_relocs
*p
;
1636 /* Add reloc counts against the indirect sym to the direct sym
1637 list. Merge any entries against the same section. */
1638 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1640 struct elf_dyn_relocs
*q
;
1642 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1643 if (q
->sec
== p
->sec
)
1645 q
->pc_count
+= p
->pc_count
;
1646 q
->count
+= p
->count
;
1653 *pp
= edir
->dyn_relocs
;
1656 edir
->dyn_relocs
= eind
->dyn_relocs
;
1657 eind
->dyn_relocs
= NULL
;
1660 if (ind
->root
.type
== bfd_link_hash_indirect
1661 && dir
->got
.refcount
<= 0)
1663 edir
->tls_type
= eind
->tls_type
;
1664 eind
->tls_type
= GOT_UNKNOWN
;
1667 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1668 generate a R_386_COPY reloc. */
1669 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1671 edir
->zero_undefweak
|= eind
->zero_undefweak
;
1673 if (ELIMINATE_COPY_RELOCS
1674 && ind
->root
.type
!= bfd_link_hash_indirect
1675 && dir
->dynamic_adjusted
)
1677 /* If called to transfer flags for a weakdef during processing
1678 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1679 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1680 if (dir
->versioned
!= versioned_hidden
)
1681 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1682 dir
->ref_regular
|= ind
->ref_regular
;
1683 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1684 dir
->needs_plt
|= ind
->needs_plt
;
1685 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1688 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1691 /* Remove undefined weak symbol from the dynamic symbol table if it
1692 is resolved to 0. */
1695 _bfd_x86_elf_fixup_symbol (struct bfd_link_info
*info
,
1696 struct elf_link_hash_entry
*h
)
1698 if (h
->dynindx
!= -1
1699 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, elf_x86_hash_entry (h
)))
1702 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
1708 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1711 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry
*h
)
1713 if (h
->plt
.offset
!= (bfd_vma
) -1
1715 && !h
->pointer_equality_needed
)
1718 return _bfd_elf_hash_symbol (h
);
1721 /* Adjust a symbol defined by a dynamic object and referenced by a
1722 regular object. The current definition is in some section of the
1723 dynamic object, but we're not including those sections. We have to
1724 change the definition to something the rest of the link can
1728 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1729 struct elf_link_hash_entry
*h
)
1731 struct elf_x86_link_hash_table
*htab
;
1733 struct elf_x86_link_hash_entry
*eh
;
1734 struct elf_dyn_relocs
*p
;
1735 const struct elf_backend_data
*bed
1736 = get_elf_backend_data (info
->output_bfd
);
1738 /* STT_GNU_IFUNC symbol must go through PLT. */
1739 if (h
->type
== STT_GNU_IFUNC
)
1741 /* All local STT_GNU_IFUNC references must be treate as local
1742 calls via local PLT. */
1744 && SYMBOL_CALLS_LOCAL (info
, h
))
1746 bfd_size_type pc_count
= 0, count
= 0;
1747 struct elf_dyn_relocs
**pp
;
1749 eh
= (struct elf_x86_link_hash_entry
*) h
;
1750 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1752 pc_count
+= p
->pc_count
;
1753 p
->count
-= p
->pc_count
;
1762 if (pc_count
|| count
)
1767 /* Increment PLT reference count only for PC-relative
1770 if (h
->plt
.refcount
<= 0)
1771 h
->plt
.refcount
= 1;
1773 h
->plt
.refcount
+= 1;
1778 if (h
->plt
.refcount
<= 0)
1780 h
->plt
.offset
= (bfd_vma
) -1;
1786 /* If this is a function, put it in the procedure linkage table. We
1787 will fill in the contents of the procedure linkage table later,
1788 when we know the address of the .got section. */
1789 if (h
->type
== STT_FUNC
1792 if (h
->plt
.refcount
<= 0
1793 || SYMBOL_CALLS_LOCAL (info
, h
)
1794 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1795 && h
->root
.type
== bfd_link_hash_undefweak
))
1797 /* This case can occur if we saw a PLT32 reloc in an input
1798 file, but the symbol was never referred to by a dynamic
1799 object, or if all references were garbage collected. In
1800 such a case, we don't actually need to build a procedure
1801 linkage table, and we can just do a PC32 reloc instead. */
1802 h
->plt
.offset
= (bfd_vma
) -1;
1809 /* It's possible that we incorrectly decided a .plt reloc was needed
1810 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1811 check_relocs. We can't decide accurately between function and
1812 non-function syms in check-relocs; Objects loaded later in
1813 the link may change h->type. So fix it now. */
1814 h
->plt
.offset
= (bfd_vma
) -1;
1816 eh
= (struct elf_x86_link_hash_entry
*) h
;
1818 /* If this is a weak symbol, and there is a real definition, the
1819 processor independent code will have arranged for us to see the
1820 real definition first, and we can just use the same value. */
1821 if (h
->is_weakalias
)
1823 struct elf_link_hash_entry
*def
= weakdef (h
);
1824 BFD_ASSERT (def
->root
.type
== bfd_link_hash_defined
);
1825 h
->root
.u
.def
.section
= def
->root
.u
.def
.section
;
1826 h
->root
.u
.def
.value
= def
->root
.u
.def
.value
;
1827 if (ELIMINATE_COPY_RELOCS
1828 || info
->nocopyreloc
1829 || SYMBOL_NO_COPYRELOC (info
, eh
))
1831 /* NB: needs_copy is always 0 for i386. */
1832 h
->non_got_ref
= def
->non_got_ref
;
1833 eh
->needs_copy
= def
->needs_copy
;
1838 /* This is a reference to a symbol defined by a dynamic object which
1839 is not a function. */
1841 /* If we are creating a shared library, we must presume that the
1842 only references to the symbol are via the global offset table.
1843 For such cases we need not do anything here; the relocations will
1844 be handled correctly by relocate_section. */
1845 if (!bfd_link_executable (info
))
1848 /* If there are no references to this symbol that do not use the
1849 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1850 reloc. NB: gotoff_ref is always 0 for x86-64. */
1851 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
1854 /* If -z nocopyreloc was given, we won't generate them either. */
1855 if (info
->nocopyreloc
|| SYMBOL_NO_COPYRELOC (info
, eh
))
1861 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1865 /* If there aren't any dynamic relocs in read-only sections nor
1866 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1867 avoid the copy reloc. This doesn't work on VxWorks, where we can
1868 not have dynamic relocations (other than copy and jump slot
1869 relocations) in an executable. */
1870 if (ELIMINATE_COPY_RELOCS
1871 && (bed
->target_id
== X86_64_ELF_DATA
1873 && htab
->target_os
!= is_vxworks
)))
1875 /* If we don't find any dynamic relocs in read-only sections,
1876 then we'll be keeping the dynamic relocs and avoiding the copy
1878 if (!readonly_dynrelocs (h
))
1885 /* We must allocate the symbol in our .dynbss section, which will
1886 become part of the .bss section of the executable. There will be
1887 an entry for this symbol in the .dynsym section. The dynamic
1888 object will contain position independent code, so all references
1889 from the dynamic object to this symbol will go through the global
1890 offset table. The dynamic linker will use the .dynsym entry to
1891 determine the address it must put in the global offset table, so
1892 both the dynamic object and the regular object will refer to the
1893 same memory location for the variable. */
1895 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1896 dynamic linker to copy the initial value out of the dynamic object
1897 and into the runtime process image. */
1898 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
1900 s
= htab
->elf
.sdynrelro
;
1901 srel
= htab
->elf
.sreldynrelro
;
1905 s
= htab
->elf
.sdynbss
;
1906 srel
= htab
->elf
.srelbss
;
1908 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
1910 srel
->size
+= htab
->sizeof_reloc
;
1914 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
1918 _bfd_x86_elf_hide_symbol (struct bfd_link_info
*info
,
1919 struct elf_link_hash_entry
*h
,
1920 bfd_boolean force_local
)
1922 if (h
->root
.type
== bfd_link_hash_undefweak
1924 && bfd_link_pie (info
))
1926 /* When there is no dynamic interpreter in PIE, make the undefined
1927 weak symbol dynamic so that PC relative branch to the undefined
1928 weak symbol will land to address 0. */
1929 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1930 if (h
->plt
.refcount
> 0
1931 || eh
->plt_got
.refcount
> 0)
1935 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
1938 /* Return TRUE if a symbol is referenced locally. It is similar to
1939 SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
1940 works in check_relocs. */
1943 _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info
*info
,
1944 struct elf_link_hash_entry
*h
)
1946 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1947 struct elf_x86_link_hash_table
*htab
1948 = (struct elf_x86_link_hash_table
*) info
->hash
;
1950 if (eh
->local_ref
> 1)
1953 if (eh
->local_ref
== 1)
1956 /* Unversioned symbols defined in regular objects can be forced local
1957 by linker version script. A weak undefined symbol is forced local
1959 1. It has non-default visibility. Or
1960 2. When building executable, there is no dynamic linker. Or
1961 3. or "-z nodynamic-undefined-weak" is used.
1963 if (SYMBOL_REFERENCES_LOCAL (info
, h
)
1964 || (h
->root
.type
== bfd_link_hash_undefweak
1965 && (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1966 || (bfd_link_executable (info
)
1967 && htab
->interp
== NULL
)
1968 || info
->dynamic_undefined_weak
== 0))
1969 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
1970 && h
->versioned
== unversioned
1971 && info
->version_info
!= NULL
1972 && bfd_hide_sym_by_version (info
->version_info
,
1973 h
->root
.root
.string
)))
1983 /* Return the section that should be marked against GC for a given
1987 _bfd_x86_elf_gc_mark_hook (asection
*sec
,
1988 struct bfd_link_info
*info
,
1989 Elf_Internal_Rela
*rel
,
1990 struct elf_link_hash_entry
*h
,
1991 Elf_Internal_Sym
*sym
)
1993 /* Compiler should optimize this out. */
1994 if (((unsigned int) R_X86_64_GNU_VTINHERIT
1995 != (unsigned int) R_386_GNU_VTINHERIT
)
1996 || ((unsigned int) R_X86_64_GNU_VTENTRY
1997 != (unsigned int) R_386_GNU_VTENTRY
))
2001 switch (ELF32_R_TYPE (rel
->r_info
))
2003 case R_X86_64_GNU_VTINHERIT
:
2004 case R_X86_64_GNU_VTENTRY
:
2008 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2012 elf_i386_get_plt_got_vma (struct elf_x86_plt
*plt_p ATTRIBUTE_UNUSED
,
2014 bfd_vma offset ATTRIBUTE_UNUSED
,
2017 return got_addr
+ off
;
2021 elf_x86_64_get_plt_got_vma (struct elf_x86_plt
*plt_p
,
2024 bfd_vma got_addr ATTRIBUTE_UNUSED
)
2026 return plt_p
->sec
->vma
+ offset
+ off
+ plt_p
->plt_got_insn_size
;
2030 elf_i386_valid_plt_reloc_p (unsigned int type
)
2032 return (type
== R_386_JUMP_SLOT
2033 || type
== R_386_GLOB_DAT
2034 || type
== R_386_IRELATIVE
);
2038 elf_x86_64_valid_plt_reloc_p (unsigned int type
)
2040 return (type
== R_X86_64_JUMP_SLOT
2041 || type
== R_X86_64_GLOB_DAT
2042 || type
== R_X86_64_IRELATIVE
);
2046 _bfd_x86_elf_get_synthetic_symtab (bfd
*abfd
,
2050 struct elf_x86_plt plts
[],
2054 long size
, i
, n
, len
;
2056 unsigned int plt_got_offset
, plt_entry_size
;
2058 bfd_byte
*plt_contents
;
2060 arelent
**dynrelbuf
, *p
;
2062 const struct elf_backend_data
*bed
;
2063 bfd_vma (*get_plt_got_vma
) (struct elf_x86_plt
*, bfd_vma
, bfd_vma
,
2065 bfd_boolean (*valid_plt_reloc_p
) (unsigned int);
2070 dynrelbuf
= (arelent
**) bfd_malloc (relsize
);
2071 if (dynrelbuf
== NULL
)
2074 dynrelcount
= bfd_canonicalize_dynamic_reloc (abfd
, dynrelbuf
,
2076 if (dynrelcount
<= 0)
2079 /* Sort the relocs by address. */
2080 qsort (dynrelbuf
, dynrelcount
, sizeof (arelent
*),
2081 _bfd_x86_elf_compare_relocs
);
2083 size
= count
* sizeof (asymbol
);
2085 /* Allocate space for @plt suffixes. */
2087 for (i
= 0; i
< dynrelcount
; i
++)
2090 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
2092 size
+= sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd
);
2095 s
= *ret
= (asymbol
*) bfd_zmalloc (size
);
2099 bed
= get_elf_backend_data (abfd
);
2101 if (bed
->target_id
== X86_64_ELF_DATA
)
2103 get_plt_got_vma
= elf_x86_64_get_plt_got_vma
;
2104 valid_plt_reloc_p
= elf_x86_64_valid_plt_reloc_p
;
2108 get_plt_got_vma
= elf_i386_get_plt_got_vma
;
2109 valid_plt_reloc_p
= elf_i386_valid_plt_reloc_p
;
2112 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
2114 asection
*sec
= bfd_get_section_by_name (abfd
, ".got.plt");
2116 got_addr
= sec
->vma
;
2119 sec
= bfd_get_section_by_name (abfd
, ".got");
2121 got_addr
= sec
->vma
;
2124 if (got_addr
== (bfd_vma
) -1)
2129 /* Check for each PLT section. */
2130 names
= (char *) (s
+ count
);
2133 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
2134 if ((plt_contents
= plts
[j
].contents
) != NULL
)
2139 struct elf_x86_plt
*plt_p
= &plts
[j
];
2141 plt_got_offset
= plt_p
->plt_got_offset
;
2142 plt_entry_size
= plt_p
->plt_entry_size
;
2146 if ((plt_p
->type
& plt_lazy
))
2148 /* Skip PLT0 in lazy PLT. */
2150 offset
= plt_entry_size
;
2158 /* Check each PLT entry against dynamic relocations. */
2159 for (; k
< plt_p
->count
; k
++)
2165 /* Get the GOT offset for i386 or the PC-relative offset
2166 for x86-64, a signed 32-bit integer. */
2167 off
= H_GET_32 (abfd
, (plt_contents
+ offset
2169 got_vma
= get_plt_got_vma (plt_p
, off
, offset
, got_addr
);
2171 /* Binary search. */
2175 while ((min
+ 1) < max
)
2179 mid
= (min
+ max
) / 2;
2181 if (got_vma
> r
->address
)
2183 else if (got_vma
< r
->address
)
2192 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
2193 if (got_vma
== p
->address
2195 && valid_plt_reloc_p (p
->howto
->type
))
2197 *s
= **p
->sym_ptr_ptr
;
2198 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
2199 set. Since we are defining a symbol, ensure one
2201 if ((s
->flags
& BSF_LOCAL
) == 0)
2202 s
->flags
|= BSF_GLOBAL
;
2203 s
->flags
|= BSF_SYNTHETIC
;
2204 /* This is no longer a section symbol. */
2205 s
->flags
&= ~BSF_SECTION_SYM
;
2207 s
->the_bfd
= plt
->owner
;
2211 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
2212 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
2218 memcpy (names
, "+0x", sizeof ("+0x") - 1);
2219 names
+= sizeof ("+0x") - 1;
2220 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
2221 for (a
= buf
; *a
== '0'; ++a
)
2224 memcpy (names
, a
, size
);
2227 memcpy (names
, "@plt", sizeof ("@plt"));
2228 names
+= sizeof ("@plt");
2231 /* There should be only one entry in PLT for a given
2232 symbol. Set howto to NULL after processing a PLT
2233 entry to guard against corrupted PLT. */
2236 offset
+= plt_entry_size
;
2240 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
2249 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
2250 if (plts
[j
].contents
!= NULL
)
2251 free (plts
[j
].contents
);
2258 /* Parse x86 GNU properties. */
2260 enum elf_property_kind
2261 _bfd_x86_elf_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
2262 bfd_byte
*ptr
, unsigned int datasz
)
2268 case GNU_PROPERTY_X86_ISA_1_USED
:
2269 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
2270 case GNU_PROPERTY_X86_FEATURE_1_AND
:
2274 ((type
== GNU_PROPERTY_X86_ISA_1_USED
2275 ? _("error: %pB: <corrupt x86 ISA used size: 0x%x>")
2276 : (type
== GNU_PROPERTY_X86_ISA_1_NEEDED
2277 ? _("error: %pB: <corrupt x86 ISA needed size: 0x%x>")
2278 : _("error: %pB: <corrupt x86 feature size: 0x%x>"))),
2280 return property_corrupt
;
2282 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
2283 /* Combine properties of the same type. */
2284 prop
->u
.number
|= bfd_h_get_32 (abfd
, ptr
);
2285 prop
->pr_kind
= property_number
;
2289 return property_ignored
;
2292 return property_number
;
2295 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
2296 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
2297 should be merged with ABFD. */
2300 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info
*info
,
2301 bfd
*abfd ATTRIBUTE_UNUSED
,
2302 elf_property
*aprop
,
2303 elf_property
*bprop
)
2305 unsigned int number
, features
;
2306 bfd_boolean updated
= FALSE
;
2307 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
2311 case GNU_PROPERTY_X86_ISA_1_USED
:
2312 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
2313 if (aprop
!= NULL
&& bprop
!= NULL
)
2315 number
= aprop
->u
.number
;
2316 aprop
->u
.number
= number
| bprop
->u
.number
;
2317 updated
= number
!= (unsigned int) aprop
->u
.number
;
2321 /* Return TRUE if APROP is NULL to indicate that BPROP should
2322 be added to ABFD. */
2323 updated
= aprop
== NULL
;
2327 case GNU_PROPERTY_X86_FEATURE_1_AND
:
2328 /* Only one of APROP and BPROP can be NULL:
2329 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2330 2. If APROP is NULL, remove x86 feature.
2331 3. Otherwise, do nothing.
2333 if (aprop
!= NULL
&& bprop
!= NULL
)
2337 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2339 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2340 number
= aprop
->u
.number
;
2341 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2342 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2343 aprop
->u
.number
= (number
& bprop
->u
.number
) | features
;
2344 updated
= number
!= (unsigned int) aprop
->u
.number
;
2345 /* Remove the property if all feature bits are cleared. */
2346 if (aprop
->u
.number
== 0)
2347 aprop
->pr_kind
= property_remove
;
2353 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2355 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2358 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2359 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2362 number
= aprop
->u
.number
;
2363 aprop
->u
.number
= number
| features
;
2364 updated
= number
!= (unsigned int) aprop
->u
.number
;
2368 bprop
->u
.number
|= features
;
2372 else if (aprop
!= NULL
)
2374 aprop
->pr_kind
= property_remove
;
2381 /* Never should happen. */
2388 /* Set up x86 GNU properties. Return the first relocatable ELF input
2389 with GNU properties if found. Otherwise, return NULL. */
2392 _bfd_x86_elf_link_setup_gnu_properties
2393 (struct bfd_link_info
*info
, struct elf_x86_init_table
*init_table
)
2395 bfd_boolean normal_target
;
2396 bfd_boolean lazy_plt
;
2397 asection
*sec
, *pltsec
;
2399 bfd_boolean use_ibt_plt
;
2400 unsigned int plt_alignment
, features
;
2401 struct elf_x86_link_hash_table
*htab
;
2405 const struct elf_backend_data
*bed
;
2406 unsigned int class_align
= ABI_64_P (info
->output_bfd
) ? 3 : 2;
2407 unsigned int got_align
;
2411 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2413 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2415 /* Find a normal input file with GNU property note. */
2416 for (pbfd
= info
->input_bfds
;
2418 pbfd
= pbfd
->link
.next
)
2419 if (bfd_get_flavour (pbfd
) == bfd_target_elf_flavour
2420 && bfd_count_sections (pbfd
) != 0)
2424 if (elf_properties (pbfd
) != NULL
)
2428 if (ebfd
!= NULL
&& features
)
2430 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
2431 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2432 prop
= _bfd_elf_get_property (ebfd
,
2433 GNU_PROPERTY_X86_FEATURE_1_AND
,
2435 prop
->u
.number
|= features
;
2436 prop
->pr_kind
= property_number
;
2438 /* Create the GNU property note section if needed. */
2441 sec
= bfd_make_section_with_flags (ebfd
,
2442 NOTE_GNU_PROPERTY_SECTION_NAME
,
2450 info
->callbacks
->einfo (_("%F%P: failed to create GNU property section\n"));
2452 if (!bfd_set_section_alignment (ebfd
, sec
, class_align
))
2455 info
->callbacks
->einfo (_("%F%pA: failed to align section\n"),
2459 elf_section_type (sec
) = SHT_NOTE
;
2463 pbfd
= _bfd_elf_link_setup_gnu_properties (info
);
2465 bed
= get_elf_backend_data (info
->output_bfd
);
2467 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2471 htab
->r_info
= init_table
->r_info
;
2472 htab
->r_sym
= init_table
->r_sym
;
2474 if (bfd_link_relocatable (info
))
2477 htab
->plt0_pad_byte
= init_table
->plt0_pad_byte
;
2479 use_ibt_plt
= info
->ibtplt
|| info
->ibt
;
2480 if (!use_ibt_plt
&& pbfd
!= NULL
)
2482 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2483 elf_property_list
*p
;
2485 /* The property list is sorted in order of type. */
2486 for (p
= elf_properties (pbfd
); p
; p
= p
->next
)
2488 if (GNU_PROPERTY_X86_FEATURE_1_AND
== p
->property
.pr_type
)
2490 use_ibt_plt
= !!(p
->property
.u
.number
2491 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
2494 else if (GNU_PROPERTY_X86_FEATURE_1_AND
< p
->property
.pr_type
)
2499 dynobj
= htab
->elf
.dynobj
;
2501 /* Set htab->elf.dynobj here so that there is no need to check and
2502 set it in check_relocs. */
2507 htab
->elf
.dynobj
= pbfd
;
2514 /* Find a normal input file to hold linker created
2516 for (abfd
= info
->input_bfds
;
2518 abfd
= abfd
->link
.next
)
2519 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2521 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0)
2523 htab
->elf
.dynobj
= abfd
;
2530 /* Return if there are no normal input files. */
2534 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2535 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2536 canonical function address. */
2537 htab
->plt
.has_plt0
= 1;
2538 normal_target
= htab
->target_os
== is_normal
;
2544 htab
->lazy_plt
= init_table
->lazy_ibt_plt
;
2545 htab
->non_lazy_plt
= init_table
->non_lazy_ibt_plt
;
2549 htab
->lazy_plt
= init_table
->lazy_plt
;
2550 htab
->non_lazy_plt
= init_table
->non_lazy_plt
;
2555 htab
->lazy_plt
= init_table
->lazy_plt
;
2556 htab
->non_lazy_plt
= NULL
;
2559 pltsec
= htab
->elf
.splt
;
2561 /* If the non-lazy PLT is available, use it for all PLT entries if
2562 there are no PLT0 or no .plt section. */
2563 if (htab
->non_lazy_plt
!= NULL
2564 && (!htab
->plt
.has_plt0
|| pltsec
== NULL
))
2567 if (bfd_link_pic (info
))
2568 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
2570 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->plt_entry
;
2571 htab
->plt
.plt_entry_size
= htab
->non_lazy_plt
->plt_entry_size
;
2572 htab
->plt
.plt_got_offset
= htab
->non_lazy_plt
->plt_got_offset
;
2573 htab
->plt
.plt_got_insn_size
2574 = htab
->non_lazy_plt
->plt_got_insn_size
;
2575 htab
->plt
.eh_frame_plt_size
2576 = htab
->non_lazy_plt
->eh_frame_plt_size
;
2577 htab
->plt
.eh_frame_plt
= htab
->non_lazy_plt
->eh_frame_plt
;
2582 if (bfd_link_pic (info
))
2584 htab
->plt
.plt0_entry
= htab
->lazy_plt
->pic_plt0_entry
;
2585 htab
->plt
.plt_entry
= htab
->lazy_plt
->pic_plt_entry
;
2589 htab
->plt
.plt0_entry
= htab
->lazy_plt
->plt0_entry
;
2590 htab
->plt
.plt_entry
= htab
->lazy_plt
->plt_entry
;
2592 htab
->plt
.plt_entry_size
= htab
->lazy_plt
->plt_entry_size
;
2593 htab
->plt
.plt_got_offset
= htab
->lazy_plt
->plt_got_offset
;
2594 htab
->plt
.plt_got_insn_size
2595 = htab
->lazy_plt
->plt_got_insn_size
;
2596 htab
->plt
.eh_frame_plt_size
2597 = htab
->lazy_plt
->eh_frame_plt_size
;
2598 htab
->plt
.eh_frame_plt
= htab
->lazy_plt
->eh_frame_plt
;
2601 if (htab
->target_os
== is_vxworks
2602 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
2605 info
->callbacks
->einfo (_("%F%P: failed to create VxWorks dynamic sections\n"));
2609 /* Since create_dynamic_sections isn't always called, but GOT
2610 relocations need GOT relocations, create them here so that we
2611 don't need to do it in check_relocs. */
2612 if (htab
->elf
.sgot
== NULL
2613 && !_bfd_elf_create_got_section (dynobj
, info
))
2614 info
->callbacks
->einfo (_("%F%P: failed to create GOT sections\n"));
2616 got_align
= (bed
->target_id
== X86_64_ELF_DATA
) ? 3 : 2;
2618 /* Align .got and .got.plt sections to their entry size. Do it here
2619 instead of in create_dynamic_sections so that they are always
2620 properly aligned even if create_dynamic_sections isn't called. */
2621 sec
= htab
->elf
.sgot
;
2622 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2623 goto error_alignment
;
2625 sec
= htab
->elf
.sgotplt
;
2626 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2627 goto error_alignment
;
2629 /* Create the ifunc sections here so that check_relocs can be
2631 if (!_bfd_elf_create_ifunc_sections (dynobj
, info
))
2632 info
->callbacks
->einfo (_("%F%P: failed to create ifunc sections\n"));
2634 plt_alignment
= bfd_log2 (htab
->plt
.plt_entry_size
);
2638 /* Whe creating executable, set the contents of the .interp
2639 section to the interpreter. */
2640 if (bfd_link_executable (info
) && !info
->nointerp
)
2642 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
2645 s
->size
= htab
->dynamic_interpreter_size
;
2646 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2650 /* Don't change PLT section alignment for NaCl since it uses
2651 64-byte PLT entry and sets PLT section alignment to 32
2652 bytes. Don't create additional PLT sections for NaCl. */
2655 flagword pltflags
= (bed
->dynamic_sec_flags
2660 unsigned int non_lazy_plt_alignment
2661 = bfd_log2 (htab
->non_lazy_plt
->plt_entry_size
);
2664 if (!bfd_set_section_alignment (sec
->owner
, sec
,
2666 goto error_alignment
;
2668 /* Create the GOT procedure linkage table. */
2669 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2673 info
->callbacks
->einfo (_("%F%P: failed to create GOT PLT section\n"));
2675 if (!bfd_set_section_alignment (dynobj
, sec
,
2676 non_lazy_plt_alignment
))
2677 goto error_alignment
;
2679 htab
->plt_got
= sec
;
2687 /* Create the second PLT for Intel IBT support. IBT
2688 PLT is supported only for non-NaCl target and is
2689 is needed only for lazy binding. */
2690 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2694 info
->callbacks
->einfo (_("%F%P: failed to create IBT-enabled PLT section\n"));
2696 if (!bfd_set_section_alignment (dynobj
, sec
,
2698 goto error_alignment
;
2700 else if (info
->bndplt
&& ABI_64_P (dynobj
))
2702 /* Create the second PLT for Intel MPX support. MPX
2703 PLT is supported only for non-NaCl target in 64-bit
2704 mode and is needed only for lazy binding. */
2705 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2709 info
->callbacks
->einfo (_("%F%P: failed to create BND PLT section\n"));
2711 if (!bfd_set_section_alignment (dynobj
, sec
,
2712 non_lazy_plt_alignment
))
2713 goto error_alignment
;
2716 htab
->plt_second
= sec
;
2720 if (!info
->no_ld_generated_unwind_info
)
2722 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2723 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2724 | SEC_LINKER_CREATED
);
2726 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2730 info
->callbacks
->einfo (_("%F%P: failed to create PLT .eh_frame section\n"));
2732 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2733 goto error_alignment
;
2735 htab
->plt_eh_frame
= sec
;
2737 if (htab
->plt_got
!= NULL
)
2739 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2743 info
->callbacks
->einfo (_("%F%P: failed to create GOT PLT .eh_frame section\n"));
2745 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2746 goto error_alignment
;
2748 htab
->plt_got_eh_frame
= sec
;
2751 if (htab
->plt_second
!= NULL
)
2753 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2757 info
->callbacks
->einfo (_("%F%P: failed to create the second PLT .eh_frame section\n"));
2759 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2760 goto error_alignment
;
2762 htab
->plt_second_eh_frame
= sec
;
2769 /* The .iplt section is used for IFUNC symbols in static
2771 sec
= htab
->elf
.iplt
;
2773 && !bfd_set_section_alignment (sec
->owner
, sec
,
2775 goto error_alignment
;