1 /* x86 specific support for ELF
2 Copyright (C) 2017 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
21 #include "elfxx-x86.h"
22 #include "elf-vxworks.h"
25 #include "elf/x86-64.h"
27 /* The name of the dynamic interpreter. This is put in the .interp
30 #define ELF32_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
31 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
32 #define ELFX32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
35 _bfd_x86_elf_mkobject (bfd
*abfd
)
37 return bfd_elf_allocate_object (abfd
,
38 sizeof (struct elf_x86_obj_tdata
),
39 get_elf_backend_data (abfd
)->target_id
);
42 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
43 executables. Rather than setting it to the beginning of the TLS
44 section, we have to set it to the end. This function may be called
45 multiple times, it is idempotent. */
48 _bfd_x86_elf_set_tls_module_base (struct bfd_link_info
*info
)
50 struct elf_x86_link_hash_table
*htab
;
51 struct bfd_link_hash_entry
*base
;
52 const struct elf_backend_data
*bed
;
54 if (!bfd_link_executable (info
))
57 bed
= get_elf_backend_data (info
->output_bfd
);
58 htab
= elf_x86_hash_table (info
, bed
->target_id
);
62 base
= htab
->tls_module_base
;
66 base
->u
.def
.value
= htab
->elf
.tls_size
;
69 /* Return the base VMA address which should be subtracted from real addresses
70 when resolving @dtpoff relocation.
71 This is PT_TLS segment p_vaddr. */
74 _bfd_x86_elf_dtpoff_base (struct bfd_link_info
*info
)
76 /* If tls_sec is NULL, we should have signalled an error already. */
77 if (elf_hash_table (info
)->tls_sec
== NULL
)
79 return elf_hash_table (info
)->tls_sec
->vma
;
82 /* Allocate space in .plt, .got and associated reloc sections for
86 elf_x86_allocate_dynrelocs (struct elf_link_hash_entry
*h
,
89 struct bfd_link_info
*info
;
90 struct elf_x86_link_hash_table
*htab
;
91 struct elf_x86_link_hash_entry
*eh
;
92 struct elf_dyn_relocs
*p
;
93 unsigned int plt_entry_size
;
94 bfd_boolean resolved_to_zero
;
95 const struct elf_backend_data
*bed
;
97 if (h
->root
.type
== bfd_link_hash_indirect
)
100 eh
= (struct elf_x86_link_hash_entry
*) h
;
102 info
= (struct bfd_link_info
*) inf
;
103 bed
= get_elf_backend_data (info
->output_bfd
);
104 htab
= elf_x86_hash_table (info
, bed
->target_id
);
108 plt_entry_size
= htab
->plt
.plt_entry_size
;
110 resolved_to_zero
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
115 /* Clear the reference count of function pointer relocations if
116 symbol isn't a normal function. */
117 if (h
->type
!= STT_FUNC
)
118 eh
->func_pointer_refcount
= 0;
120 /* We can't use the GOT PLT if pointer equality is needed since
121 finish_dynamic_symbol won't clear symbol value and the dynamic
122 linker won't update the GOT slot. We will get into an infinite
124 if (htab
->plt_got
!= NULL
125 && h
->type
!= STT_GNU_IFUNC
126 && !h
->pointer_equality_needed
127 && h
->plt
.refcount
> 0
128 && h
->got
.refcount
> 0)
130 /* Don't use the regular PLT if there are both GOT and GOTPLT
132 h
->plt
.offset
= (bfd_vma
) -1;
134 /* Use the GOT PLT. */
135 eh
->plt_got
.refcount
= 1;
138 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
139 here if it is defined and referenced in a non-shared object. */
140 if (h
->type
== STT_GNU_IFUNC
143 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
, &eh
->dyn_relocs
,
144 &htab
->readonly_dynrelocs_against_ifunc
,
148 htab
->got_entry_size
,
151 asection
*s
= htab
->plt_second
;
152 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
154 /* Use the second PLT section if it is created. */
155 eh
->plt_second
.offset
= s
->size
;
157 /* Make room for this entry in the second PLT section. */
158 s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
166 /* Don't create the PLT entry if there are only function pointer
167 relocations which can be resolved at run-time. */
168 else if (htab
->elf
.dynamic_sections_created
169 && (h
->plt
.refcount
> eh
->func_pointer_refcount
170 || eh
->plt_got
.refcount
> 0))
172 bfd_boolean use_plt_got
= eh
->plt_got
.refcount
> 0;
174 /* Clear the reference count of function pointer relocations
176 eh
->func_pointer_refcount
= 0;
178 /* Make sure this symbol is output as a dynamic symbol.
179 Undefined weak syms won't yet be marked as dynamic. */
183 && h
->root
.type
== bfd_link_hash_undefweak
)
185 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
189 if (bfd_link_pic (info
)
190 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
192 asection
*s
= htab
->elf
.splt
;
193 asection
*second_s
= htab
->plt_second
;
194 asection
*got_s
= htab
->plt_got
;
196 /* If this is the first .plt entry, make room for the special
197 first entry. The .plt section is used by prelink to undo
198 prelinking for dynamic relocations. */
200 s
->size
= htab
->plt
.has_plt0
* plt_entry_size
;
203 eh
->plt_got
.offset
= got_s
->size
;
206 h
->plt
.offset
= s
->size
;
208 eh
->plt_second
.offset
= second_s
->size
;
211 /* If this symbol is not defined in a regular file, and we are
212 not generating a shared library, then set the symbol to this
213 location in the .plt. This is required to make function
214 pointers compare as equal between the normal executable and
215 the shared library. */
216 if (! bfd_link_pic (info
)
221 /* We need to make a call to the entry of the GOT PLT
222 instead of regular PLT entry. */
223 h
->root
.u
.def
.section
= got_s
;
224 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
230 /* We need to make a call to the entry of the
231 second PLT instead of regular PLT entry. */
232 h
->root
.u
.def
.section
= second_s
;
233 h
->root
.u
.def
.value
= eh
->plt_second
.offset
;
237 h
->root
.u
.def
.section
= s
;
238 h
->root
.u
.def
.value
= h
->plt
.offset
;
243 /* Make room for this entry. */
245 got_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
248 s
->size
+= plt_entry_size
;
250 second_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
252 /* We also need to make an entry in the .got.plt section,
253 which will be placed in the .got section by the linker
255 htab
->elf
.sgotplt
->size
+= htab
->got_entry_size
;
257 /* There should be no PLT relocation against resolved
258 undefined weak symbol in executable. */
259 if (!resolved_to_zero
)
261 /* We also need to make an entry in the .rel.plt
263 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
264 htab
->elf
.srelplt
->reloc_count
++;
268 if (htab
->is_vxworks
&& !bfd_link_pic (info
))
270 /* VxWorks has a second set of relocations for each PLT entry
271 in executables. They go in a separate relocation section,
272 which is processed by the kernel loader. */
274 /* There are two relocations for the initial PLT entry: an
275 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
276 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
278 asection
*srelplt2
= htab
->srelplt2
;
279 if (h
->plt
.offset
== plt_entry_size
)
280 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
282 /* There are two extra relocations for each subsequent PLT entry:
283 an R_386_32 relocation for the GOT entry, and an R_386_32
284 relocation for the PLT entry. */
286 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
291 eh
->plt_got
.offset
= (bfd_vma
) -1;
292 h
->plt
.offset
= (bfd_vma
) -1;
298 eh
->plt_got
.offset
= (bfd_vma
) -1;
299 h
->plt
.offset
= (bfd_vma
) -1;
303 eh
->tlsdesc_got
= (bfd_vma
) -1;
305 /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the
306 binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For
307 x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
308 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
309 if (h
->got
.refcount
> 0
310 && bfd_link_executable (info
)
312 && (elf_x86_hash_entry (h
)->tls_type
& GOT_TLS_IE
))
313 h
->got
.offset
= (bfd_vma
) -1;
314 else if (h
->got
.refcount
> 0)
318 int tls_type
= elf_x86_hash_entry (h
)->tls_type
;
320 /* Make sure this symbol is output as a dynamic symbol.
321 Undefined weak syms won't yet be marked as dynamic. */
325 && h
->root
.type
== bfd_link_hash_undefweak
)
327 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
332 if (GOT_TLS_GDESC_P (tls_type
))
334 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
335 - elf_x86_compute_jump_table_size (htab
);
336 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
337 h
->got
.offset
= (bfd_vma
) -2;
339 if (! GOT_TLS_GDESC_P (tls_type
)
340 || GOT_TLS_GD_P (tls_type
))
342 h
->got
.offset
= s
->size
;
343 s
->size
+= htab
->got_entry_size
;
344 /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
346 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
347 s
->size
+= htab
->got_entry_size
;
349 dyn
= htab
->elf
.dynamic_sections_created
;
350 /* R_386_TLS_IE_32 needs one dynamic relocation,
351 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
352 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
353 need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local
354 symbol and two if global. No dynamic relocation against
355 resolved undefined weak symbol in executable. */
356 if (tls_type
== GOT_TLS_IE_BOTH
)
357 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
358 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
359 || (tls_type
& GOT_TLS_IE
))
360 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
361 else if (GOT_TLS_GD_P (tls_type
))
362 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
363 else if (! GOT_TLS_GDESC_P (tls_type
)
364 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
365 && !resolved_to_zero
)
366 || h
->root
.type
!= bfd_link_hash_undefweak
)
367 && (bfd_link_pic (info
)
368 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
369 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
370 if (GOT_TLS_GDESC_P (tls_type
))
372 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
373 if (bed
->target_id
== X86_64_ELF_DATA
)
374 htab
->tlsdesc_plt
= (bfd_vma
) -1;
378 h
->got
.offset
= (bfd_vma
) -1;
380 if (eh
->dyn_relocs
== NULL
)
383 /* In the shared -Bsymbolic case, discard space allocated for
384 dynamic pc-relative relocs against symbols which turn out to be
385 defined in regular objects. For the normal shared case, discard
386 space for pc-relative relocs that have become local due to symbol
387 visibility changes. */
389 if (bfd_link_pic (info
))
391 /* Relocs that use pc_count are those that appear on a call
392 insn, or certain REL relocs that can generated via assembly.
393 We want calls to protected symbols to resolve directly to the
394 function rather than going via the plt. If people want
395 function pointer comparisons to work as expected then they
396 should avoid writing weird assembly. */
397 if (SYMBOL_CALLS_LOCAL (info
, h
))
399 struct elf_dyn_relocs
**pp
;
401 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
403 p
->count
-= p
->pc_count
;
412 if (htab
->is_vxworks
)
414 struct elf_dyn_relocs
**pp
;
415 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
417 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
424 /* Also discard relocs on undefined weak syms with non-default
425 visibility or in PIE. */
426 if (eh
->dyn_relocs
!= NULL
)
428 if (h
->root
.type
== bfd_link_hash_undefweak
)
430 /* Undefined weak symbol is never bound locally in shared
432 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
435 if (bed
->target_id
== I386_ELF_DATA
438 /* Keep dynamic non-GOT/non-PLT relocation so
439 that we can branch to 0 without PLT. */
440 struct elf_dyn_relocs
**pp
;
442 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
443 if (p
->pc_count
== 0)
447 /* Remove non-R_386_PC32 relocation. */
448 p
->count
= p
->pc_count
;
452 /* Make sure undefined weak symbols are output
453 as dynamic symbols in PIEs for dynamic non-GOT
454 non-PLT reloations. */
455 if (eh
->dyn_relocs
!= NULL
456 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
460 eh
->dyn_relocs
= NULL
;
462 else if (h
->dynindx
== -1
464 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
467 else if (bfd_link_executable (info
)
468 && (h
->needs_copy
|| eh
->needs_copy
)
472 /* NB: needs_copy is set only for x86-64. For PIE,
473 discard space for pc-relative relocs against symbols
474 which turn out to need copy relocs. */
475 struct elf_dyn_relocs
**pp
;
477 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
479 if (p
->pc_count
!= 0)
487 else if (ELIMINATE_COPY_RELOCS
)
489 /* For the non-shared case, discard space for relocs against
490 symbols which turn out to need copy relocs or are not
491 dynamic. Keep dynamic relocations for run-time function
492 pointer initialization. */
495 || eh
->func_pointer_refcount
> 0
496 || (h
->root
.type
== bfd_link_hash_undefweak
497 && !resolved_to_zero
))
500 || (htab
->elf
.dynamic_sections_created
501 && (h
->root
.type
== bfd_link_hash_undefweak
502 || h
->root
.type
== bfd_link_hash_undefined
))))
504 /* Make sure this symbol is output as a dynamic symbol.
505 Undefined weak syms won't yet be marked as dynamic. */
509 && h
->root
.type
== bfd_link_hash_undefweak
510 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
513 /* If that succeeded, we know we'll be keeping all the
515 if (h
->dynindx
!= -1)
519 eh
->dyn_relocs
= NULL
;
520 eh
->func_pointer_refcount
= 0;
525 /* Finally, allocate space. */
526 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
530 sreloc
= elf_section_data (p
->sec
)->sreloc
;
532 BFD_ASSERT (sreloc
!= NULL
);
533 sreloc
->size
+= p
->count
* htab
->sizeof_reloc
;
539 /* Find any dynamic relocs that apply to read-only sections. */
542 _bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
,
545 struct elf_x86_link_hash_entry
*eh
;
546 struct elf_dyn_relocs
*p
;
548 /* Skip local IFUNC symbols. */
549 if (h
->forced_local
&& h
->type
== STT_GNU_IFUNC
)
552 eh
= (struct elf_x86_link_hash_entry
*) h
;
553 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
555 asection
*s
= p
->sec
->output_section
;
557 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
559 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
561 info
->flags
|= DF_TEXTREL
;
563 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
564 || info
->error_textrel
)
565 /* xgettext:c-format */
566 info
->callbacks
->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
567 p
->sec
->owner
, h
->root
.root
.string
,
570 /* Not an error, just cut short the traversal. */
577 /* Allocate space in .plt, .got and associated reloc sections for
578 local dynamic relocs. */
581 elf_x86_allocate_local_dynreloc (void **slot
, void *inf
)
583 struct elf_link_hash_entry
*h
584 = (struct elf_link_hash_entry
*) *slot
;
586 if (h
->type
!= STT_GNU_IFUNC
590 || h
->root
.type
!= bfd_link_hash_defined
)
593 return elf_x86_allocate_dynrelocs (h
, inf
);
596 /* Find and/or create a hash entry for local symbol. */
598 struct elf_link_hash_entry
*
599 _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table
*htab
,
600 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
603 struct elf_x86_link_hash_entry e
, *ret
;
604 asection
*sec
= abfd
->sections
;
605 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
606 htab
->r_sym (rel
->r_info
));
609 e
.elf
.indx
= sec
->id
;
610 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
611 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
612 create
? INSERT
: NO_INSERT
);
619 ret
= (struct elf_x86_link_hash_entry
*) *slot
;
623 ret
= (struct elf_x86_link_hash_entry
*)
624 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
625 sizeof (struct elf_x86_link_hash_entry
));
628 memset (ret
, 0, sizeof (*ret
));
629 ret
->elf
.indx
= sec
->id
;
630 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
631 ret
->elf
.dynindx
= -1;
632 ret
->plt_got
.offset
= (bfd_vma
) -1;
638 /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN
639 SYNC WITH _bfd_elf_link_hash_newfunc. */
641 struct bfd_hash_entry
*
642 _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
643 struct bfd_hash_table
*table
,
646 /* Allocate the structure if it has not already been allocated by a
650 entry
= (struct bfd_hash_entry
*)
651 bfd_hash_allocate (table
,
652 sizeof (struct elf_x86_link_hash_entry
));
657 /* Call the allocation method of the superclass. */
658 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
661 struct elf_x86_link_hash_entry
*eh
662 = (struct elf_x86_link_hash_entry
*) entry
;
663 struct elf_link_hash_table
*htab
664 = (struct elf_link_hash_table
*) table
;
666 memset (&eh
->elf
.size
, 0,
667 (sizeof (struct elf_x86_link_hash_entry
)
668 - offsetof (struct elf_link_hash_entry
, size
)));
669 /* Set local fields. */
671 eh
->elf
.dynindx
= -1;
672 eh
->elf
.got
= htab
->init_got_refcount
;
673 eh
->elf
.plt
= htab
->init_plt_refcount
;
674 /* Assume that we have been called by a non-ELF symbol reader.
675 This flag is then reset by the code which reads an ELF input
676 file. This ensures that a symbol created by a non-ELF symbol
677 reader will have the flag set correctly. */
679 eh
->plt_second
.offset
= (bfd_vma
) -1;
680 eh
->plt_got
.offset
= (bfd_vma
) -1;
681 eh
->tlsdesc_got
= (bfd_vma
) -1;
687 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
688 for local symbol so that we can handle local STT_GNU_IFUNC symbols
689 as global symbol. We reuse indx and dynstr_index for local symbol
690 hash since they aren't used by global symbols in this backend. */
693 _bfd_x86_elf_local_htab_hash (const void *ptr
)
695 struct elf_link_hash_entry
*h
696 = (struct elf_link_hash_entry
*) ptr
;
697 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
700 /* Compare local hash entries. */
703 _bfd_x86_elf_local_htab_eq (const void *ptr1
, const void *ptr2
)
705 struct elf_link_hash_entry
*h1
706 = (struct elf_link_hash_entry
*) ptr1
;
707 struct elf_link_hash_entry
*h2
708 = (struct elf_link_hash_entry
*) ptr2
;
710 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
713 /* Destroy an x86 ELF linker hash table. */
716 elf_x86_link_hash_table_free (bfd
*obfd
)
718 struct elf_x86_link_hash_table
*htab
719 = (struct elf_x86_link_hash_table
*) obfd
->link
.hash
;
721 if (htab
->loc_hash_table
)
722 htab_delete (htab
->loc_hash_table
);
723 if (htab
->loc_hash_memory
)
724 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
725 _bfd_elf_link_hash_table_free (obfd
);
729 elf_i386_is_reloc_section (const char *secname
)
731 return CONST_STRNEQ (secname
, ".rel");
735 elf_x86_64_is_reloc_section (const char *secname
)
737 return CONST_STRNEQ (secname
, ".rela");
740 /* Create an x86 ELF linker hash table. */
742 struct bfd_link_hash_table
*
743 _bfd_x86_elf_link_hash_table_create (bfd
*abfd
)
745 struct elf_x86_link_hash_table
*ret
;
746 const struct elf_backend_data
*bed
;
747 bfd_size_type amt
= sizeof (struct elf_x86_link_hash_table
);
749 ret
= (struct elf_x86_link_hash_table
*) bfd_zmalloc (amt
);
753 bed
= get_elf_backend_data (abfd
);
754 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
755 _bfd_x86_elf_link_hash_newfunc
,
756 sizeof (struct elf_x86_link_hash_entry
),
763 if (bed
->target_id
== X86_64_ELF_DATA
)
765 ret
->is_reloc_section
= elf_x86_64_is_reloc_section
;
766 ret
->dt_reloc
= DT_RELA
;
767 ret
->dt_reloc_sz
= DT_RELASZ
;
768 ret
->dt_reloc_ent
= DT_RELAENT
;
769 ret
->got_entry_size
= 8;
770 ret
->tls_get_addr
= "__tls_get_addr";
774 ret
->sizeof_reloc
= sizeof (Elf64_External_Rela
);
775 ret
->pointer_r_type
= R_X86_64_64
;
776 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
777 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
781 if (bed
->target_id
== X86_64_ELF_DATA
)
783 ret
->sizeof_reloc
= sizeof (Elf32_External_Rela
);
784 ret
->pointer_r_type
= R_X86_64_32
;
785 ret
->dynamic_interpreter
= ELFX32_DYNAMIC_INTERPRETER
;
786 ret
->dynamic_interpreter_size
787 = sizeof ELFX32_DYNAMIC_INTERPRETER
;
791 ret
->is_reloc_section
= elf_i386_is_reloc_section
;
792 ret
->dt_reloc
= DT_REL
;
793 ret
->dt_reloc_sz
= DT_RELSZ
;
794 ret
->dt_reloc_ent
= DT_RELENT
;
795 ret
->sizeof_reloc
= sizeof (Elf32_External_Rel
);
796 ret
->got_entry_size
= 4;
797 ret
->pointer_r_type
= R_386_32
;
798 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
799 ret
->dynamic_interpreter_size
800 = sizeof ELF32_DYNAMIC_INTERPRETER
;
801 ret
->tls_get_addr
= "___tls_get_addr";
804 ret
->target_id
= bed
->target_id
;
806 ret
->loc_hash_table
= htab_try_create (1024,
807 _bfd_x86_elf_local_htab_hash
,
808 _bfd_x86_elf_local_htab_eq
,
810 ret
->loc_hash_memory
= objalloc_create ();
811 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
813 elf_x86_link_hash_table_free (abfd
);
816 ret
->elf
.root
.hash_table_free
= elf_x86_link_hash_table_free
;
818 return &ret
->elf
.root
;
821 /* Sort relocs into address order. */
824 _bfd_x86_elf_compare_relocs (const void *ap
, const void *bp
)
826 const arelent
*a
= * (const arelent
**) ap
;
827 const arelent
*b
= * (const arelent
**) bp
;
829 if (a
->address
> b
->address
)
831 else if (a
->address
< b
->address
)
838 _bfd_x86_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
840 if (!bfd_link_relocatable (info
))
842 /* Check for __tls_get_addr reference. */
843 struct elf_x86_link_hash_table
*htab
;
844 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
845 htab
= elf_x86_hash_table (info
, bed
->target_id
);
848 struct elf_link_hash_entry
*h
849 = elf_link_hash_lookup (elf_hash_table (info
),
851 FALSE
, FALSE
, FALSE
);
853 ((struct elf_x86_link_hash_entry
*) h
)->tls_get_addr
= 1;
857 /* Invoke the regular ELF backend linker to do all the work. */
858 return _bfd_elf_link_check_relocs (abfd
, info
);
861 /* Set the sizes of the dynamic sections. */
864 _bfd_x86_elf_size_dynamic_sections (bfd
*output_bfd
,
865 struct bfd_link_info
*info
)
867 struct elf_x86_link_hash_table
*htab
;
872 const struct elf_backend_data
*bed
873 = get_elf_backend_data (output_bfd
);
875 htab
= elf_x86_hash_table (info
, bed
->target_id
);
878 dynobj
= htab
->elf
.dynobj
;
882 /* Set up .got offsets for local syms, and space for local dynamic
884 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
886 bfd_signed_vma
*local_got
;
887 bfd_signed_vma
*end_local_got
;
888 char *local_tls_type
;
889 bfd_vma
*local_tlsdesc_gotent
;
890 bfd_size_type locsymcount
;
891 Elf_Internal_Shdr
*symtab_hdr
;
894 if (! is_x86_elf (ibfd
, htab
))
897 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
899 struct elf_dyn_relocs
*p
;
901 for (p
= ((struct elf_dyn_relocs
*)
902 elf_section_data (s
)->local_dynrel
);
906 if (!bfd_is_abs_section (p
->sec
)
907 && bfd_is_abs_section (p
->sec
->output_section
))
909 /* Input section has been discarded, either because
910 it is a copy of a linkonce section or due to
911 linker script /DISCARD/, so we'll be discarding
914 else if (htab
->is_vxworks
915 && strcmp (p
->sec
->output_section
->name
,
918 /* Relocations in vxworks .tls_vars sections are
919 handled specially by the loader. */
921 else if (p
->count
!= 0)
923 srel
= elf_section_data (p
->sec
)->sreloc
;
924 srel
->size
+= p
->count
* htab
->sizeof_reloc
;
925 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
926 && (info
->flags
& DF_TEXTREL
) == 0)
928 info
->flags
|= DF_TEXTREL
;
929 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
930 || info
->error_textrel
)
931 /* xgettext:c-format */
932 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
933 p
->sec
->owner
, p
->sec
);
939 local_got
= elf_local_got_refcounts (ibfd
);
943 symtab_hdr
= &elf_symtab_hdr (ibfd
);
944 locsymcount
= symtab_hdr
->sh_info
;
945 end_local_got
= local_got
+ locsymcount
;
946 local_tls_type
= elf_x86_local_got_tls_type (ibfd
);
947 local_tlsdesc_gotent
= elf_x86_local_tlsdesc_gotent (ibfd
);
949 srel
= htab
->elf
.srelgot
;
950 for (; local_got
< end_local_got
;
951 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
953 *local_tlsdesc_gotent
= (bfd_vma
) -1;
956 if (GOT_TLS_GDESC_P (*local_tls_type
))
958 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
959 - elf_x86_compute_jump_table_size (htab
);
960 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
961 *local_got
= (bfd_vma
) -2;
963 if (! GOT_TLS_GDESC_P (*local_tls_type
)
964 || GOT_TLS_GD_P (*local_tls_type
))
966 *local_got
= s
->size
;
967 s
->size
+= htab
->got_entry_size
;
968 if (GOT_TLS_GD_P (*local_tls_type
)
969 || *local_tls_type
== GOT_TLS_IE_BOTH
)
970 s
->size
+= htab
->got_entry_size
;
972 if (bfd_link_pic (info
)
973 || GOT_TLS_GD_ANY_P (*local_tls_type
)
974 || (*local_tls_type
& GOT_TLS_IE
))
976 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
977 srel
->size
+= 2 * htab
->sizeof_reloc
;
978 else if (GOT_TLS_GD_P (*local_tls_type
)
979 || ! GOT_TLS_GDESC_P (*local_tls_type
))
980 srel
->size
+= htab
->sizeof_reloc
;
981 if (GOT_TLS_GDESC_P (*local_tls_type
))
983 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
984 if (bed
->target_id
== X86_64_ELF_DATA
)
985 htab
->tlsdesc_plt
= (bfd_vma
) -1;
990 *local_got
= (bfd_vma
) -1;
994 if (htab
->tls_ld_or_ldm_got
.refcount
> 0)
996 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
997 or R_X86_64_TLSLD relocs. */
998 htab
->tls_ld_or_ldm_got
.offset
= htab
->elf
.sgot
->size
;
999 htab
->elf
.sgot
->size
+= 2 * htab
->got_entry_size
;
1000 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
1003 htab
->tls_ld_or_ldm_got
.offset
= -1;
1005 /* Allocate global sym .plt and .got entries, and space for global
1006 sym dynamic relocs. */
1007 elf_link_hash_traverse (&htab
->elf
, elf_x86_allocate_dynrelocs
,
1010 /* Allocate .plt and .got entries, and space for local symbols. */
1011 htab_traverse (htab
->loc_hash_table
, elf_x86_allocate_local_dynreloc
,
1014 /* For every jump slot reserved in the sgotplt, reloc_count is
1015 incremented. However, when we reserve space for TLS descriptors,
1016 it's not incremented, so in order to compute the space reserved
1017 for them, it suffices to multiply the reloc count by the jump
1020 PR ld/13302: We start next_irelative_index at the end of .rela.plt
1021 so that R_{386,X86_64}_IRELATIVE entries come last. */
1022 if (htab
->elf
.srelplt
)
1024 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
1025 htab
->sgotplt_jump_table_size
1026 = elf_x86_compute_jump_table_size (htab
);
1027 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
1029 else if (htab
->elf
.irelplt
)
1030 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
1032 if (htab
->tlsdesc_plt
)
1034 /* NB: tlsdesc_plt is set only for x86-64. If we're not using
1035 lazy TLS relocations, don't generate the PLT and GOT entries
1037 if ((info
->flags
& DF_BIND_NOW
))
1038 htab
->tlsdesc_plt
= 0;
1041 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
1042 htab
->elf
.sgot
->size
+= htab
->got_entry_size
;
1043 /* Reserve room for the initial entry.
1044 FIXME: we could probably do away with it in this case. */
1045 if (htab
->elf
.splt
->size
== 0)
1046 htab
->elf
.splt
->size
= htab
->plt
.plt_entry_size
;
1047 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
1048 htab
->elf
.splt
->size
+= htab
->plt
.plt_entry_size
;
1052 if (htab
->elf
.sgotplt
)
1054 /* Don't allocate .got.plt section if there are no GOT nor PLT
1055 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
1056 if ((htab
->elf
.hgot
== NULL
1057 || !htab
->elf
.hgot
->ref_regular_nonweak
)
1058 && (htab
->elf
.sgotplt
->size
== bed
->got_header_size
)
1059 && (htab
->elf
.splt
== NULL
1060 || htab
->elf
.splt
->size
== 0)
1061 && (htab
->elf
.sgot
== NULL
1062 || htab
->elf
.sgot
->size
== 0)
1063 && (htab
->elf
.iplt
== NULL
1064 || htab
->elf
.iplt
->size
== 0)
1065 && (htab
->elf
.igotplt
== NULL
1066 || htab
->elf
.igotplt
->size
== 0))
1067 htab
->elf
.sgotplt
->size
= 0;
1070 if (_bfd_elf_eh_frame_present (info
))
1072 if (htab
->plt_eh_frame
!= NULL
1073 && htab
->elf
.splt
!= NULL
1074 && htab
->elf
.splt
->size
!= 0
1075 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
1076 htab
->plt_eh_frame
->size
= htab
->plt
.eh_frame_plt_size
;
1078 if (htab
->plt_got_eh_frame
!= NULL
1079 && htab
->plt_got
!= NULL
1080 && htab
->plt_got
->size
!= 0
1081 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
1082 htab
->plt_got_eh_frame
->size
1083 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1085 /* Unwind info for the second PLT and .plt.got sections are
1087 if (htab
->plt_second_eh_frame
!= NULL
1088 && htab
->plt_second
!= NULL
1089 && htab
->plt_second
->size
!= 0
1090 && !bfd_is_abs_section (htab
->plt_second
->output_section
))
1091 htab
->plt_second_eh_frame
->size
1092 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1095 /* We now have determined the sizes of the various dynamic sections.
1096 Allocate memory for them. */
1098 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1100 bfd_boolean strip_section
= TRUE
;
1102 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1105 if (s
== htab
->elf
.splt
1106 || s
== htab
->elf
.sgot
)
1108 /* Strip this section if we don't need it; see the
1110 /* We'd like to strip these sections if they aren't needed, but if
1111 we've exported dynamic symbols from them we must leave them.
1112 It's too late to tell BFD to get rid of the symbols. */
1114 if (htab
->elf
.hplt
!= NULL
)
1115 strip_section
= FALSE
;
1117 else if (s
== htab
->elf
.sgotplt
1118 || s
== htab
->elf
.iplt
1119 || s
== htab
->elf
.igotplt
1120 || s
== htab
->plt_second
1121 || s
== htab
->plt_got
1122 || s
== htab
->plt_eh_frame
1123 || s
== htab
->plt_got_eh_frame
1124 || s
== htab
->plt_second_eh_frame
1125 || s
== htab
->elf
.sdynbss
1126 || s
== htab
->elf
.sdynrelro
)
1128 /* Strip these too. */
1130 else if (htab
->is_reloc_section (bfd_get_section_name (dynobj
, s
)))
1133 && s
!= htab
->elf
.srelplt
1134 && s
!= htab
->srelplt2
)
1137 /* We use the reloc_count field as a counter if we need
1138 to copy relocs into the output file. */
1139 if (s
!= htab
->elf
.srelplt
)
1144 /* It's not one of our sections, so don't allocate space. */
1150 /* If we don't need this section, strip it from the
1151 output file. This is mostly to handle .rel.bss and
1152 .rel.plt. We must create both sections in
1153 create_dynamic_sections, because they must be created
1154 before the linker maps input sections to output
1155 sections. The linker does that before
1156 adjust_dynamic_symbol is called, and it is that
1157 function which decides whether anything needs to go
1158 into these sections. */
1160 s
->flags
|= SEC_EXCLUDE
;
1164 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1167 /* Allocate memory for the section contents. We use bfd_zalloc
1168 here in case unused entries are not reclaimed before the
1169 section's contents are written out. This should not happen,
1170 but this way if it does, we get a R_386_NONE or R_X86_64_NONE
1171 reloc instead of garbage. */
1172 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
1173 if (s
->contents
== NULL
)
1177 if (htab
->plt_eh_frame
!= NULL
1178 && htab
->plt_eh_frame
->contents
!= NULL
)
1180 memcpy (htab
->plt_eh_frame
->contents
,
1181 htab
->plt
.eh_frame_plt
,
1182 htab
->plt_eh_frame
->size
);
1183 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
1184 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
1187 if (htab
->plt_got_eh_frame
!= NULL
1188 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1190 memcpy (htab
->plt_got_eh_frame
->contents
,
1191 htab
->non_lazy_plt
->eh_frame_plt
,
1192 htab
->plt_got_eh_frame
->size
);
1193 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
1194 (htab
->plt_got_eh_frame
->contents
1195 + PLT_FDE_LEN_OFFSET
));
1198 if (htab
->plt_second_eh_frame
!= NULL
1199 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1201 memcpy (htab
->plt_second_eh_frame
->contents
,
1202 htab
->non_lazy_plt
->eh_frame_plt
,
1203 htab
->plt_second_eh_frame
->size
);
1204 bfd_put_32 (dynobj
, htab
->plt_second
->size
,
1205 (htab
->plt_second_eh_frame
->contents
1206 + PLT_FDE_LEN_OFFSET
));
1209 if (htab
->elf
.dynamic_sections_created
)
1211 /* Add some entries to the .dynamic section. We fill in the
1212 values later, in elf_{i386,x86_64}_finish_dynamic_sections,
1213 but we must add the entries now so that we get the correct
1214 size for the .dynamic section. The DT_DEBUG entry is filled
1215 in by the dynamic linker and used by the debugger. */
1216 #define add_dynamic_entry(TAG, VAL) \
1217 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1219 if (bfd_link_executable (info
))
1221 if (!add_dynamic_entry (DT_DEBUG
, 0))
1225 if (htab
->elf
.splt
->size
!= 0)
1227 /* DT_PLTGOT is used by prelink even if there is no PLT
1229 if (!add_dynamic_entry (DT_PLTGOT
, 0))
1233 if (htab
->elf
.srelplt
->size
!= 0)
1235 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
1236 || !add_dynamic_entry (DT_PLTREL
, htab
->dt_reloc
)
1237 || !add_dynamic_entry (DT_JMPREL
, 0))
1241 if (htab
->tlsdesc_plt
1242 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
1243 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
1248 if (!add_dynamic_entry (htab
->dt_reloc
, 0)
1249 || !add_dynamic_entry (htab
->dt_reloc_sz
, 0)
1250 || !add_dynamic_entry (htab
->dt_reloc_ent
,
1251 htab
->sizeof_reloc
))
1254 /* If any dynamic relocs apply to a read-only section,
1255 then we need a DT_TEXTREL entry. */
1256 if ((info
->flags
& DF_TEXTREL
) == 0)
1257 elf_link_hash_traverse (&htab
->elf
,
1258 _bfd_x86_elf_readonly_dynrelocs
,
1261 if ((info
->flags
& DF_TEXTREL
) != 0)
1263 if (htab
->readonly_dynrelocs_against_ifunc
)
1265 info
->callbacks
->einfo
1266 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
1267 bfd_set_error (bfd_error_bad_value
);
1271 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1275 if (htab
->is_vxworks
1276 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
1279 #undef add_dynamic_entry
1285 _bfd_x86_elf_always_size_sections (bfd
*output_bfd
,
1286 struct bfd_link_info
*info
)
1288 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
1292 struct elf_link_hash_entry
*tlsbase
;
1294 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
1295 "_TLS_MODULE_BASE_",
1296 FALSE
, FALSE
, FALSE
);
1298 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
1300 struct elf_x86_link_hash_table
*htab
;
1301 struct bfd_link_hash_entry
*bh
= NULL
;
1302 const struct elf_backend_data
*bed
1303 = get_elf_backend_data (output_bfd
);
1305 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1309 if (!(_bfd_generic_link_add_one_symbol
1310 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1311 tls_sec
, 0, NULL
, FALSE
,
1312 bed
->collect
, &bh
)))
1315 htab
->tls_module_base
= bh
;
1317 tlsbase
= (struct elf_link_hash_entry
*)bh
;
1318 tlsbase
->def_regular
= 1;
1319 tlsbase
->other
= STV_HIDDEN
;
1320 tlsbase
->root
.linker_def
= 1;
1321 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1329 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
1330 const Elf_Internal_Sym
*isym
,
1331 bfd_boolean definition
,
1332 bfd_boolean dynamic ATTRIBUTE_UNUSED
)
1336 struct elf_x86_link_hash_entry
*eh
1337 = (struct elf_x86_link_hash_entry
*) h
;
1338 eh
->def_protected
= (ELF_ST_VISIBILITY (isym
->st_other
)
1343 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1346 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info
*info
,
1347 struct elf_link_hash_entry
*dir
,
1348 struct elf_link_hash_entry
*ind
)
1350 struct elf_x86_link_hash_entry
*edir
, *eind
;
1352 edir
= (struct elf_x86_link_hash_entry
*) dir
;
1353 eind
= (struct elf_x86_link_hash_entry
*) ind
;
1355 if (eind
->dyn_relocs
!= NULL
)
1357 if (edir
->dyn_relocs
!= NULL
)
1359 struct elf_dyn_relocs
**pp
;
1360 struct elf_dyn_relocs
*p
;
1362 /* Add reloc counts against the indirect sym to the direct sym
1363 list. Merge any entries against the same section. */
1364 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1366 struct elf_dyn_relocs
*q
;
1368 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1369 if (q
->sec
== p
->sec
)
1371 q
->pc_count
+= p
->pc_count
;
1372 q
->count
+= p
->count
;
1379 *pp
= edir
->dyn_relocs
;
1382 edir
->dyn_relocs
= eind
->dyn_relocs
;
1383 eind
->dyn_relocs
= NULL
;
1386 if (ind
->root
.type
== bfd_link_hash_indirect
1387 && dir
->got
.refcount
<= 0)
1389 edir
->tls_type
= eind
->tls_type
;
1390 eind
->tls_type
= GOT_UNKNOWN
;
1393 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1394 generate a R_386_COPY reloc. */
1395 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1397 edir
->has_got_reloc
|= eind
->has_got_reloc
;
1398 edir
->has_non_got_reloc
|= eind
->has_non_got_reloc
;
1400 if (ELIMINATE_COPY_RELOCS
1401 && ind
->root
.type
!= bfd_link_hash_indirect
1402 && dir
->dynamic_adjusted
)
1404 /* If called to transfer flags for a weakdef during processing
1405 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1406 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1407 if (dir
->versioned
!= versioned_hidden
)
1408 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1409 dir
->ref_regular
|= ind
->ref_regular
;
1410 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1411 dir
->needs_plt
|= ind
->needs_plt
;
1412 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1416 if (eind
->func_pointer_refcount
> 0)
1418 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1419 eind
->func_pointer_refcount
= 0;
1422 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1426 /* Remove undefined weak symbol from the dynamic symbol table if it
1427 is resolved to 0. */
1430 _bfd_x86_elf_fixup_symbol (struct bfd_link_info
*info
,
1431 struct elf_link_hash_entry
*h
)
1433 if (h
->dynindx
!= -1)
1435 const struct elf_backend_data
*bed
1436 = get_elf_backend_data (info
->output_bfd
);
1437 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
1439 elf_x86_hash_entry (h
)->has_got_reloc
,
1440 elf_x86_hash_entry (h
)))
1443 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
1450 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1453 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry
*h
)
1455 if (h
->plt
.offset
!= (bfd_vma
) -1
1457 && !h
->pointer_equality_needed
)
1460 return _bfd_elf_hash_symbol (h
);
1463 /* Adjust a symbol defined by a dynamic object and referenced by a
1464 regular object. The current definition is in some section of the
1465 dynamic object, but we're not including those sections. We have to
1466 change the definition to something the rest of the link can
1470 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1471 struct elf_link_hash_entry
*h
)
1473 struct elf_x86_link_hash_table
*htab
;
1475 struct elf_x86_link_hash_entry
*eh
;
1476 struct elf_dyn_relocs
*p
;
1477 const struct elf_backend_data
*bed
1478 = get_elf_backend_data (info
->output_bfd
);
1480 /* STT_GNU_IFUNC symbol must go through PLT. */
1481 if (h
->type
== STT_GNU_IFUNC
)
1483 /* All local STT_GNU_IFUNC references must be treate as local
1484 calls via local PLT. */
1486 && SYMBOL_CALLS_LOCAL (info
, h
))
1488 bfd_size_type pc_count
= 0, count
= 0;
1489 struct elf_dyn_relocs
**pp
;
1491 eh
= (struct elf_x86_link_hash_entry
*) h
;
1492 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1494 pc_count
+= p
->pc_count
;
1495 p
->count
-= p
->pc_count
;
1504 if (pc_count
|| count
)
1509 /* Increment PLT reference count only for PC-relative
1512 if (h
->plt
.refcount
<= 0)
1513 h
->plt
.refcount
= 1;
1515 h
->plt
.refcount
+= 1;
1520 if (h
->plt
.refcount
<= 0)
1522 h
->plt
.offset
= (bfd_vma
) -1;
1528 /* If this is a function, put it in the procedure linkage table. We
1529 will fill in the contents of the procedure linkage table later,
1530 when we know the address of the .got section. */
1531 if (h
->type
== STT_FUNC
1534 if (h
->plt
.refcount
<= 0
1535 || SYMBOL_CALLS_LOCAL (info
, h
)
1536 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1537 && h
->root
.type
== bfd_link_hash_undefweak
))
1539 /* This case can occur if we saw a PLT32 reloc in an input
1540 file, but the symbol was never referred to by a dynamic
1541 object, or if all references were garbage collected. In
1542 such a case, we don't actually need to build a procedure
1543 linkage table, and we can just do a PC32 reloc instead. */
1544 h
->plt
.offset
= (bfd_vma
) -1;
1551 /* It's possible that we incorrectly decided a .plt reloc was needed
1552 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1553 check_relocs. We can't decide accurately between function and
1554 non-function syms in check-relocs; Objects loaded later in
1555 the link may change h->type. So fix it now. */
1556 h
->plt
.offset
= (bfd_vma
) -1;
1558 eh
= (struct elf_x86_link_hash_entry
*) h
;
1560 /* If this is a weak symbol, and there is a real definition, the
1561 processor independent code will have arranged for us to see the
1562 real definition first, and we can just use the same value. */
1563 if (h
->u
.weakdef
!= NULL
)
1565 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1566 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1567 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1568 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1569 if (ELIMINATE_COPY_RELOCS
1570 || info
->nocopyreloc
1571 || SYMBOL_NO_COPYRELOC (info
, eh
))
1573 /* NB: needs_copy is always 0 for i386. */
1574 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1575 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
1580 /* This is a reference to a symbol defined by a dynamic object which
1581 is not a function. */
1583 /* If we are creating a shared library, we must presume that the
1584 only references to the symbol are via the global offset table.
1585 For such cases we need not do anything here; the relocations will
1586 be handled correctly by relocate_section. */
1587 if (!bfd_link_executable (info
))
1590 /* If there are no references to this symbol that do not use the
1591 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1592 reloc. NB: gotoff_ref is always 0 for x86-64. */
1593 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
1596 /* If -z nocopyreloc was given, we won't generate them either. */
1597 if (info
->nocopyreloc
|| SYMBOL_NO_COPYRELOC (info
, eh
))
1603 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1607 /* If there aren't any dynamic relocs in read-only sections nor
1608 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1609 avoid the copy reloc. This doesn't work on VxWorks, where we can
1610 not have dynamic relocations (other than copy and jump slot
1611 relocations) in an executable. */
1612 if (ELIMINATE_COPY_RELOCS
1613 && (bed
->target_id
== X86_64_ELF_DATA
1615 && !htab
->is_vxworks
)))
1617 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1619 s
= p
->sec
->output_section
;
1620 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1624 /* If we didn't find any dynamic relocs in read-only sections,
1625 then we'll be keeping the dynamic relocs and avoiding the copy
1634 /* We must allocate the symbol in our .dynbss section, which will
1635 become part of the .bss section of the executable. There will be
1636 an entry for this symbol in the .dynsym section. The dynamic
1637 object will contain position independent code, so all references
1638 from the dynamic object to this symbol will go through the global
1639 offset table. The dynamic linker will use the .dynsym entry to
1640 determine the address it must put in the global offset table, so
1641 both the dynamic object and the regular object will refer to the
1642 same memory location for the variable. */
1644 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1645 dynamic linker to copy the initial value out of the dynamic object
1646 and into the runtime process image. */
1647 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
1649 s
= htab
->elf
.sdynrelro
;
1650 srel
= htab
->elf
.sreldynrelro
;
1654 s
= htab
->elf
.sdynbss
;
1655 srel
= htab
->elf
.srelbss
;
1657 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
1659 srel
->size
+= htab
->sizeof_reloc
;
1663 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
1666 /* Return TRUE if a symbol is referenced locally. It is similar to
1667 SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
1668 works in check_relocs. */
1671 _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info
*info
,
1672 struct elf_link_hash_entry
*h
)
1674 struct elf_x86_link_hash_entry
*eh
1675 = (struct elf_x86_link_hash_entry
*) h
;
1677 if (eh
->local_ref
> 1)
1680 if (eh
->local_ref
== 1)
1683 /* Unversioned symbols defined in regular objects can be forced local
1684 by linker version script. A weak undefined symbol can fored local
1685 if it has non-default visibility or "-z nodynamic-undefined-weak"
1687 if (SYMBOL_REFERENCES_LOCAL (info
, h
)
1688 || ((ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1689 || info
->dynamic_undefined_weak
== 0)
1690 && h
->root
.type
== bfd_link_hash_undefweak
)
1691 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
1692 && h
->versioned
== unversioned
1693 && info
->version_info
!= NULL
1694 && bfd_hide_sym_by_version (info
->version_info
,
1695 h
->root
.root
.string
)))
1705 /* Return the section that should be marked against GC for a given
1709 _bfd_x86_elf_gc_mark_hook (asection
*sec
,
1710 struct bfd_link_info
*info
,
1711 Elf_Internal_Rela
*rel
,
1712 struct elf_link_hash_entry
*h
,
1713 Elf_Internal_Sym
*sym
)
1715 /* Compiler should optimize this out. */
1716 if (((unsigned int) R_X86_64_GNU_VTINHERIT
1717 != (unsigned int) R_386_GNU_VTINHERIT
)
1718 || ((unsigned int) R_X86_64_GNU_VTENTRY
1719 != (unsigned int) R_386_GNU_VTENTRY
))
1723 switch (ELF32_R_TYPE (rel
->r_info
))
1725 case R_X86_64_GNU_VTINHERIT
:
1726 case R_X86_64_GNU_VTENTRY
:
1730 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1734 elf_i386_get_plt_got_vma (struct elf_x86_plt
*plt_p ATTRIBUTE_UNUSED
,
1736 bfd_vma offset ATTRIBUTE_UNUSED
,
1739 return got_addr
+ off
;
1743 elf_x86_64_get_plt_got_vma (struct elf_x86_plt
*plt_p
,
1746 bfd_vma got_addr ATTRIBUTE_UNUSED
)
1748 return plt_p
->sec
->vma
+ offset
+ off
+ plt_p
->plt_got_insn_size
;
1752 elf_i386_valid_plt_reloc_p (unsigned int type
)
1754 return (type
== R_386_JUMP_SLOT
1755 || type
== R_386_GLOB_DAT
1756 || type
== R_386_IRELATIVE
);
1760 elf_x86_64_valid_plt_reloc_p (unsigned int type
)
1762 return (type
== R_X86_64_JUMP_SLOT
1763 || type
== R_X86_64_GLOB_DAT
1764 || type
== R_X86_64_IRELATIVE
);
1768 _bfd_x86_elf_get_synthetic_symtab (bfd
*abfd
,
1772 struct elf_x86_plt plts
[],
1776 long size
, i
, n
, len
;
1778 unsigned int plt_got_offset
, plt_entry_size
;
1780 bfd_byte
*plt_contents
;
1782 arelent
**dynrelbuf
, *p
;
1784 const struct elf_backend_data
*bed
;
1785 bfd_vma (*get_plt_got_vma
) (struct elf_x86_plt
*, bfd_vma
, bfd_vma
,
1787 bfd_boolean (*valid_plt_reloc_p
) (unsigned int);
1792 dynrelbuf
= (arelent
**) bfd_malloc (relsize
);
1793 if (dynrelbuf
== NULL
)
1796 dynrelcount
= bfd_canonicalize_dynamic_reloc (abfd
, dynrelbuf
,
1799 /* Sort the relocs by address. */
1800 qsort (dynrelbuf
, dynrelcount
, sizeof (arelent
*),
1801 _bfd_x86_elf_compare_relocs
);
1803 size
= count
* sizeof (asymbol
);
1805 /* Allocate space for @plt suffixes. */
1807 for (i
= 0; i
< dynrelcount
; i
++)
1810 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
1812 size
+= sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd
);
1815 s
= *ret
= (asymbol
*) bfd_zmalloc (size
);
1819 bed
= get_elf_backend_data (abfd
);
1821 if (bed
->target_id
== X86_64_ELF_DATA
)
1823 get_plt_got_vma
= elf_x86_64_get_plt_got_vma
;
1824 valid_plt_reloc_p
= elf_x86_64_valid_plt_reloc_p
;
1828 get_plt_got_vma
= elf_i386_get_plt_got_vma
;
1829 valid_plt_reloc_p
= elf_i386_valid_plt_reloc_p
;
1832 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
1834 asection
*sec
= bfd_get_section_by_name (abfd
, ".got.plt");
1836 got_addr
= sec
->vma
;
1839 sec
= bfd_get_section_by_name (abfd
, ".got");
1841 got_addr
= sec
->vma
;
1844 if (got_addr
== (bfd_vma
) -1)
1849 /* Check for each PLT section. */
1850 names
= (char *) (s
+ count
);
1853 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
1854 if ((plt_contents
= plts
[j
].contents
) != NULL
)
1859 struct elf_x86_plt
*plt_p
= &plts
[j
];
1861 plt_got_offset
= plt_p
->plt_got_offset
;
1862 plt_entry_size
= plt_p
->plt_entry_size
;
1866 if ((plt_p
->type
& plt_lazy
))
1868 /* Skip PLT0 in lazy PLT. */
1870 offset
= plt_entry_size
;
1878 /* Check each PLT entry against dynamic relocations. */
1879 for (; k
< plt_p
->count
; k
++)
1885 /* Get the GOT offset for i386 or the PC-relative offset
1886 for x86-64, a signed 32-bit integer. */
1887 off
= H_GET_32 (abfd
, (plt_contents
+ offset
1889 got_vma
= get_plt_got_vma (plt_p
, off
, offset
, got_addr
);
1891 /* Binary search. */
1895 while ((min
+ 1) < max
)
1899 mid
= (min
+ max
) / 2;
1901 if (got_vma
> r
->address
)
1903 else if (got_vma
< r
->address
)
1912 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
1913 if (got_vma
== p
->address
1915 && valid_plt_reloc_p (p
->howto
->type
))
1917 *s
= **p
->sym_ptr_ptr
;
1918 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
1919 set. Since we are defining a symbol, ensure one
1921 if ((s
->flags
& BSF_LOCAL
) == 0)
1922 s
->flags
|= BSF_GLOBAL
;
1923 s
->flags
|= BSF_SYNTHETIC
;
1924 /* This is no longer a section symbol. */
1925 s
->flags
&= ~BSF_SECTION_SYM
;
1927 s
->the_bfd
= plt
->owner
;
1931 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
1932 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
1938 memcpy (names
, "+0x", sizeof ("+0x") - 1);
1939 names
+= sizeof ("+0x") - 1;
1940 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
1941 for (a
= buf
; *a
== '0'; ++a
)
1944 memcpy (names
, a
, size
);
1947 memcpy (names
, "@plt", sizeof ("@plt"));
1948 names
+= sizeof ("@plt");
1952 offset
+= plt_entry_size
;
1956 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
1965 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
1966 if (plts
[j
].contents
!= NULL
)
1967 free (plts
[j
].contents
);
1974 /* Parse x86 GNU properties. */
1976 enum elf_property_kind
1977 _bfd_x86_elf_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
1978 bfd_byte
*ptr
, unsigned int datasz
)
1984 case GNU_PROPERTY_X86_ISA_1_USED
:
1985 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
1986 case GNU_PROPERTY_X86_FEATURE_1_AND
:
1990 ((type
== GNU_PROPERTY_X86_ISA_1_USED
1991 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
1992 : (type
== GNU_PROPERTY_X86_ISA_1_NEEDED
1993 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
1994 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
1996 return property_corrupt
;
1998 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
1999 /* Combine properties of the same type. */
2000 prop
->u
.number
|= bfd_h_get_32 (abfd
, ptr
);
2001 prop
->pr_kind
= property_number
;
2005 return property_ignored
;
2008 return property_number
;
2011 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
2012 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
2013 should be merged with ABFD. */
2016 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info
*info
,
2017 bfd
*abfd ATTRIBUTE_UNUSED
,
2018 elf_property
*aprop
,
2019 elf_property
*bprop
)
2021 unsigned int number
, features
;
2022 bfd_boolean updated
= FALSE
;
2023 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
2027 case GNU_PROPERTY_X86_ISA_1_USED
:
2028 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
2029 if (aprop
!= NULL
&& bprop
!= NULL
)
2031 number
= aprop
->u
.number
;
2032 aprop
->u
.number
= number
| bprop
->u
.number
;
2033 updated
= number
!= (unsigned int) aprop
->u
.number
;
2037 /* Return TRUE if APROP is NULL to indicate that BPROP should
2038 be added to ABFD. */
2039 updated
= aprop
== NULL
;
2043 case GNU_PROPERTY_X86_FEATURE_1_AND
:
2044 /* Only one of APROP and BPROP can be NULL:
2045 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2046 2. If APROP is NULL, remove x86 feature.
2047 3. Otherwise, do nothing.
2049 if (aprop
!= NULL
&& bprop
!= NULL
)
2053 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2055 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2056 number
= aprop
->u
.number
;
2057 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2058 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2059 aprop
->u
.number
= (number
& bprop
->u
.number
) | features
;
2060 updated
= number
!= (unsigned int) aprop
->u
.number
;
2061 /* Remove the property if all feature bits are cleared. */
2062 if (aprop
->u
.number
== 0)
2063 aprop
->pr_kind
= property_remove
;
2069 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2071 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2074 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2075 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2078 number
= aprop
->u
.number
;
2079 aprop
->u
.number
= number
| features
;
2080 updated
= number
!= (unsigned int) aprop
->u
.number
;
2084 bprop
->u
.number
|= features
;
2088 else if (aprop
!= NULL
)
2090 aprop
->pr_kind
= property_remove
;
2097 /* Never should happen. */
2104 /* Set up x86 GNU properties. Return the first relocatable ELF input
2105 with GNU properties if found. Otherwise, return NULL. */
2108 _bfd_x86_elf_link_setup_gnu_properties
2109 (struct bfd_link_info
*info
,
2110 struct elf_x86_plt_layout_table
*plt_layout
)
2112 bfd_boolean normal_target
;
2113 bfd_boolean lazy_plt
;
2114 asection
*sec
, *pltsec
;
2116 bfd_boolean use_ibt_plt
;
2117 unsigned int plt_alignment
, features
;
2118 struct elf_x86_link_hash_table
*htab
;
2122 const struct elf_backend_data
*bed
;
2123 unsigned int class_align
= ABI_64_P (info
->output_bfd
) ? 3 : 2;
2124 unsigned int got_align
;
2128 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2130 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2132 /* Find a normal input file with GNU property note. */
2133 for (pbfd
= info
->input_bfds
;
2135 pbfd
= pbfd
->link
.next
)
2136 if (bfd_get_flavour (pbfd
) == bfd_target_elf_flavour
2137 && bfd_count_sections (pbfd
) != 0)
2141 if (elf_properties (pbfd
) != NULL
)
2145 if (ebfd
!= NULL
&& features
)
2147 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
2148 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2149 prop
= _bfd_elf_get_property (ebfd
,
2150 GNU_PROPERTY_X86_FEATURE_1_AND
,
2152 prop
->u
.number
|= features
;
2153 prop
->pr_kind
= property_number
;
2155 /* Create the GNU property note section if needed. */
2158 sec
= bfd_make_section_with_flags (ebfd
,
2159 NOTE_GNU_PROPERTY_SECTION_NAME
,
2167 info
->callbacks
->einfo (_("%F: failed to create GNU property section\n"));
2169 if (!bfd_set_section_alignment (ebfd
, sec
, class_align
))
2172 info
->callbacks
->einfo (_("%F%A: failed to align section\n"),
2176 elf_section_type (sec
) = SHT_NOTE
;
2180 pbfd
= _bfd_elf_link_setup_gnu_properties (info
);
2182 bed
= get_elf_backend_data (info
->output_bfd
);
2184 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2188 htab
->is_vxworks
= plt_layout
->is_vxworks
;
2189 htab
->r_info
= plt_layout
->r_info
;
2190 htab
->r_sym
= plt_layout
->r_sym
;
2192 if (bfd_link_relocatable (info
))
2195 use_ibt_plt
= info
->ibtplt
|| info
->ibt
;
2196 if (!use_ibt_plt
&& pbfd
!= NULL
)
2198 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2199 elf_property_list
*p
;
2201 /* The property list is sorted in order of type. */
2202 for (p
= elf_properties (pbfd
); p
; p
= p
->next
)
2204 if (GNU_PROPERTY_X86_FEATURE_1_AND
== p
->property
.pr_type
)
2206 use_ibt_plt
= !!(p
->property
.u
.number
2207 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
2210 else if (GNU_PROPERTY_X86_FEATURE_1_AND
< p
->property
.pr_type
)
2215 dynobj
= htab
->elf
.dynobj
;
2217 /* Set htab->elf.dynobj here so that there is no need to check and
2218 set it in check_relocs. */
2223 htab
->elf
.dynobj
= pbfd
;
2230 /* Find a normal input file to hold linker created
2232 for (abfd
= info
->input_bfds
;
2234 abfd
= abfd
->link
.next
)
2235 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2237 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0)
2239 htab
->elf
.dynobj
= abfd
;
2246 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2247 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2248 canonical function address. */
2249 htab
->plt
.has_plt0
= 1;
2250 normal_target
= plt_layout
->normal_target
;
2256 htab
->lazy_plt
= plt_layout
->lazy_ibt_plt
;
2257 htab
->non_lazy_plt
= plt_layout
->non_lazy_ibt_plt
;
2261 htab
->lazy_plt
= plt_layout
->lazy_plt
;
2262 htab
->non_lazy_plt
= plt_layout
->non_lazy_plt
;
2267 htab
->lazy_plt
= plt_layout
->lazy_plt
;
2268 htab
->non_lazy_plt
= NULL
;
2271 pltsec
= htab
->elf
.splt
;
2273 /* If the non-lazy PLT is available, use it for all PLT entries if
2274 there are no PLT0 or no .plt section. */
2275 if (htab
->non_lazy_plt
!= NULL
2276 && (!htab
->plt
.has_plt0
|| pltsec
== NULL
))
2279 if (bfd_link_pic (info
))
2280 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
2282 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->plt_entry
;
2283 htab
->plt
.plt_entry_size
= htab
->non_lazy_plt
->plt_entry_size
;
2284 htab
->plt
.plt_got_offset
= htab
->non_lazy_plt
->plt_got_offset
;
2285 htab
->plt
.plt_got_insn_size
2286 = htab
->non_lazy_plt
->plt_got_insn_size
;
2287 htab
->plt
.eh_frame_plt_size
2288 = htab
->non_lazy_plt
->eh_frame_plt_size
;
2289 htab
->plt
.eh_frame_plt
= htab
->non_lazy_plt
->eh_frame_plt
;
2294 if (bfd_link_pic (info
))
2296 htab
->plt
.plt0_entry
= htab
->lazy_plt
->pic_plt0_entry
;
2297 htab
->plt
.plt_entry
= htab
->lazy_plt
->pic_plt_entry
;
2301 htab
->plt
.plt0_entry
= htab
->lazy_plt
->plt0_entry
;
2302 htab
->plt
.plt_entry
= htab
->lazy_plt
->plt_entry
;
2304 htab
->plt
.plt_entry_size
= htab
->lazy_plt
->plt_entry_size
;
2305 htab
->plt
.plt_got_offset
= htab
->lazy_plt
->plt_got_offset
;
2306 htab
->plt
.plt_got_insn_size
2307 = htab
->lazy_plt
->plt_got_insn_size
;
2308 htab
->plt
.eh_frame_plt_size
2309 = htab
->lazy_plt
->eh_frame_plt_size
;
2310 htab
->plt
.eh_frame_plt
= htab
->lazy_plt
->eh_frame_plt
;
2313 /* Return if there are no normal input files. */
2317 if (htab
->is_vxworks
2318 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
2321 info
->callbacks
->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
2325 /* Since create_dynamic_sections isn't always called, but GOT
2326 relocations need GOT relocations, create them here so that we
2327 don't need to do it in check_relocs. */
2328 if (htab
->elf
.sgot
== NULL
2329 && !_bfd_elf_create_got_section (dynobj
, info
))
2330 info
->callbacks
->einfo (_("%F: failed to create GOT sections\n"));
2332 got_align
= (bed
->target_id
== X86_64_ELF_DATA
) ? 3 : 2;
2334 /* Align .got and .got.plt sections to their entry size. Do it here
2335 instead of in create_dynamic_sections so that they are always
2336 properly aligned even if create_dynamic_sections isn't called. */
2337 sec
= htab
->elf
.sgot
;
2338 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2339 goto error_alignment
;
2341 sec
= htab
->elf
.sgotplt
;
2342 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2343 goto error_alignment
;
2345 /* Create the ifunc sections here so that check_relocs can be
2347 if (!_bfd_elf_create_ifunc_sections (dynobj
, info
))
2348 info
->callbacks
->einfo (_("%F: failed to create ifunc sections\n"));
2350 plt_alignment
= bfd_log2 (htab
->plt
.plt_entry_size
);
2354 /* Whe creating executable, set the contents of the .interp
2355 section to the interpreter. */
2356 if (bfd_link_executable (info
) && !info
->nointerp
)
2358 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
2361 s
->size
= htab
->dynamic_interpreter_size
;
2362 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2366 /* Don't change PLT section alignment for NaCl since it uses
2367 64-byte PLT entry and sets PLT section alignment to 32
2368 bytes. Don't create additional PLT sections for NaCl. */
2371 flagword pltflags
= (bed
->dynamic_sec_flags
2376 unsigned int non_lazy_plt_alignment
2377 = bfd_log2 (htab
->non_lazy_plt
->plt_entry_size
);
2380 if (!bfd_set_section_alignment (sec
->owner
, sec
,
2382 goto error_alignment
;
2384 /* Create the GOT procedure linkage table. */
2385 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2389 info
->callbacks
->einfo (_("%F: failed to create GOT PLT section\n"));
2391 if (!bfd_set_section_alignment (dynobj
, sec
,
2392 non_lazy_plt_alignment
))
2393 goto error_alignment
;
2395 htab
->plt_got
= sec
;
2403 /* Create the second PLT for Intel IBT support. IBT
2404 PLT is supported only for non-NaCl target and is
2405 is needed only for lazy binding. */
2406 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2410 info
->callbacks
->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
2412 if (!bfd_set_section_alignment (dynobj
, sec
,
2414 goto error_alignment
;
2416 else if (info
->bndplt
&& ABI_64_P (dynobj
))
2418 /* Create the second PLT for Intel MPX support. MPX
2419 PLT is supported only for non-NaCl target in 64-bit
2420 mode and is needed only for lazy binding. */
2421 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2425 info
->callbacks
->einfo (_("%F: failed to create BND PLT section\n"));
2427 if (!bfd_set_section_alignment (dynobj
, sec
,
2428 non_lazy_plt_alignment
))
2429 goto error_alignment
;
2432 htab
->plt_second
= sec
;
2436 if (!info
->no_ld_generated_unwind_info
)
2438 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2439 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2440 | SEC_LINKER_CREATED
);
2442 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2446 info
->callbacks
->einfo (_("%F: failed to create PLT .eh_frame section\n"));
2448 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2449 goto error_alignment
;
2451 htab
->plt_eh_frame
= sec
;
2453 if (htab
->plt_got
!= NULL
)
2455 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2459 info
->callbacks
->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
2461 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2462 goto error_alignment
;
2464 htab
->plt_got_eh_frame
= sec
;
2467 if (htab
->plt_second
!= NULL
)
2469 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2473 info
->callbacks
->einfo (_("%F: failed to create the second PLT .eh_frame section\n"));
2475 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2476 goto error_alignment
;
2478 htab
->plt_second_eh_frame
= sec
;
2485 /* The .iplt section is used for IFUNC symbols in static
2487 sec
= htab
->elf
.iplt
;
2489 && !bfd_set_section_alignment (sec
->owner
, sec
,
2491 goto error_alignment
;