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");
736 elf_x86_64_is_reloc_section (const char *secname
)
738 return CONST_STRNEQ (secname
, ".rela");
742 /* Create an x86 ELF linker hash table. */
744 struct bfd_link_hash_table
*
745 _bfd_x86_elf_link_hash_table_create (bfd
*abfd
)
747 struct elf_x86_link_hash_table
*ret
;
748 const struct elf_backend_data
*bed
;
749 bfd_size_type amt
= sizeof (struct elf_x86_link_hash_table
);
751 ret
= (struct elf_x86_link_hash_table
*) bfd_zmalloc (amt
);
755 bed
= get_elf_backend_data (abfd
);
756 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
757 _bfd_x86_elf_link_hash_newfunc
,
758 sizeof (struct elf_x86_link_hash_entry
),
766 /* NB: If BFD64 isn't defined, only i386 will be supported. */
767 if (bed
->target_id
== X86_64_ELF_DATA
)
769 ret
->convert_load
= _bfd_x86_64_elf_convert_load
;
770 ret
->is_reloc_section
= elf_x86_64_is_reloc_section
;
771 ret
->dt_reloc
= DT_RELA
;
772 ret
->dt_reloc_sz
= DT_RELASZ
;
773 ret
->dt_reloc_ent
= DT_RELAENT
;
774 ret
->got_entry_size
= 8;
775 ret
->tls_get_addr
= "__tls_get_addr";
779 ret
->r_info
= elf64_r_info
;
780 ret
->r_sym
= elf64_r_sym
;
781 ret
->sizeof_reloc
= sizeof (Elf64_External_Rela
);
782 ret
->pointer_r_type
= R_X86_64_64
;
783 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
784 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
789 ret
->r_info
= elf32_r_info
;
790 ret
->r_sym
= elf32_r_sym
;
791 if (bed
->target_id
== X86_64_ELF_DATA
)
793 ret
->sizeof_reloc
= sizeof (Elf32_External_Rela
);
794 ret
->pointer_r_type
= R_X86_64_32
;
795 ret
->dynamic_interpreter
= ELFX32_DYNAMIC_INTERPRETER
;
796 ret
->dynamic_interpreter_size
797 = sizeof ELFX32_DYNAMIC_INTERPRETER
;
801 ret
->convert_load
= _bfd_i386_elf_convert_load
;
802 ret
->is_reloc_section
= elf_i386_is_reloc_section
;
803 ret
->dt_reloc
= DT_REL
;
804 ret
->dt_reloc_sz
= DT_RELSZ
;
805 ret
->dt_reloc_ent
= DT_RELENT
;
806 ret
->sizeof_reloc
= sizeof (Elf32_External_Rel
);
807 ret
->got_entry_size
= 4;
808 ret
->pointer_r_type
= R_386_32
;
809 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
810 ret
->dynamic_interpreter_size
811 = sizeof ELF32_DYNAMIC_INTERPRETER
;
812 ret
->tls_get_addr
= "___tls_get_addr";
815 ret
->target_id
= bed
->target_id
;
817 ret
->loc_hash_table
= htab_try_create (1024,
818 _bfd_x86_elf_local_htab_hash
,
819 _bfd_x86_elf_local_htab_eq
,
821 ret
->loc_hash_memory
= objalloc_create ();
822 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
824 elf_x86_link_hash_table_free (abfd
);
827 ret
->elf
.root
.hash_table_free
= elf_x86_link_hash_table_free
;
829 return &ret
->elf
.root
;
832 /* Sort relocs into address order. */
835 _bfd_x86_elf_compare_relocs (const void *ap
, const void *bp
)
837 const arelent
*a
= * (const arelent
**) ap
;
838 const arelent
*b
= * (const arelent
**) bp
;
840 if (a
->address
> b
->address
)
842 else if (a
->address
< b
->address
)
849 _bfd_x86_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
851 if (!bfd_link_relocatable (info
))
853 /* Check for __tls_get_addr reference. */
854 struct elf_x86_link_hash_table
*htab
;
855 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
856 htab
= elf_x86_hash_table (info
, bed
->target_id
);
859 struct elf_link_hash_entry
*h
860 = elf_link_hash_lookup (elf_hash_table (info
),
862 FALSE
, FALSE
, FALSE
);
864 ((struct elf_x86_link_hash_entry
*) h
)->tls_get_addr
= 1;
868 /* Invoke the regular ELF backend linker to do all the work. */
869 return _bfd_elf_link_check_relocs (abfd
, info
);
872 /* Set the sizes of the dynamic sections. */
875 _bfd_x86_elf_size_dynamic_sections (bfd
*output_bfd
,
876 struct bfd_link_info
*info
)
878 struct elf_x86_link_hash_table
*htab
;
883 const struct elf_backend_data
*bed
884 = get_elf_backend_data (output_bfd
);
886 htab
= elf_x86_hash_table (info
, bed
->target_id
);
889 dynobj
= htab
->elf
.dynobj
;
893 /* Set up .got offsets for local syms, and space for local dynamic
895 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
897 bfd_signed_vma
*local_got
;
898 bfd_signed_vma
*end_local_got
;
899 char *local_tls_type
;
900 bfd_vma
*local_tlsdesc_gotent
;
901 bfd_size_type locsymcount
;
902 Elf_Internal_Shdr
*symtab_hdr
;
905 if (! is_x86_elf (ibfd
, htab
))
908 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
910 struct elf_dyn_relocs
*p
;
912 if (!htab
->convert_load (ibfd
, s
, info
))
915 for (p
= ((struct elf_dyn_relocs
*)
916 elf_section_data (s
)->local_dynrel
);
920 if (!bfd_is_abs_section (p
->sec
)
921 && bfd_is_abs_section (p
->sec
->output_section
))
923 /* Input section has been discarded, either because
924 it is a copy of a linkonce section or due to
925 linker script /DISCARD/, so we'll be discarding
928 else if (htab
->is_vxworks
929 && strcmp (p
->sec
->output_section
->name
,
932 /* Relocations in vxworks .tls_vars sections are
933 handled specially by the loader. */
935 else if (p
->count
!= 0)
937 srel
= elf_section_data (p
->sec
)->sreloc
;
938 srel
->size
+= p
->count
* htab
->sizeof_reloc
;
939 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
940 && (info
->flags
& DF_TEXTREL
) == 0)
942 info
->flags
|= DF_TEXTREL
;
943 if ((info
->warn_shared_textrel
&& bfd_link_pic (info
))
944 || info
->error_textrel
)
945 /* xgettext:c-format */
946 info
->callbacks
->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
947 p
->sec
->owner
, p
->sec
);
953 local_got
= elf_local_got_refcounts (ibfd
);
957 symtab_hdr
= &elf_symtab_hdr (ibfd
);
958 locsymcount
= symtab_hdr
->sh_info
;
959 end_local_got
= local_got
+ locsymcount
;
960 local_tls_type
= elf_x86_local_got_tls_type (ibfd
);
961 local_tlsdesc_gotent
= elf_x86_local_tlsdesc_gotent (ibfd
);
963 srel
= htab
->elf
.srelgot
;
964 for (; local_got
< end_local_got
;
965 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
967 *local_tlsdesc_gotent
= (bfd_vma
) -1;
970 if (GOT_TLS_GDESC_P (*local_tls_type
))
972 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
973 - elf_x86_compute_jump_table_size (htab
);
974 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
975 *local_got
= (bfd_vma
) -2;
977 if (! GOT_TLS_GDESC_P (*local_tls_type
)
978 || GOT_TLS_GD_P (*local_tls_type
))
980 *local_got
= s
->size
;
981 s
->size
+= htab
->got_entry_size
;
982 if (GOT_TLS_GD_P (*local_tls_type
)
983 || *local_tls_type
== GOT_TLS_IE_BOTH
)
984 s
->size
+= htab
->got_entry_size
;
986 if (bfd_link_pic (info
)
987 || GOT_TLS_GD_ANY_P (*local_tls_type
)
988 || (*local_tls_type
& GOT_TLS_IE
))
990 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
991 srel
->size
+= 2 * htab
->sizeof_reloc
;
992 else if (GOT_TLS_GD_P (*local_tls_type
)
993 || ! GOT_TLS_GDESC_P (*local_tls_type
))
994 srel
->size
+= htab
->sizeof_reloc
;
995 if (GOT_TLS_GDESC_P (*local_tls_type
))
997 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
998 if (bed
->target_id
== X86_64_ELF_DATA
)
999 htab
->tlsdesc_plt
= (bfd_vma
) -1;
1004 *local_got
= (bfd_vma
) -1;
1008 if (htab
->tls_ld_or_ldm_got
.refcount
> 0)
1010 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1011 or R_X86_64_TLSLD relocs. */
1012 htab
->tls_ld_or_ldm_got
.offset
= htab
->elf
.sgot
->size
;
1013 htab
->elf
.sgot
->size
+= 2 * htab
->got_entry_size
;
1014 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
1017 htab
->tls_ld_or_ldm_got
.offset
= -1;
1019 /* Allocate global sym .plt and .got entries, and space for global
1020 sym dynamic relocs. */
1021 elf_link_hash_traverse (&htab
->elf
, elf_x86_allocate_dynrelocs
,
1024 /* Allocate .plt and .got entries, and space for local symbols. */
1025 htab_traverse (htab
->loc_hash_table
, elf_x86_allocate_local_dynreloc
,
1028 /* For every jump slot reserved in the sgotplt, reloc_count is
1029 incremented. However, when we reserve space for TLS descriptors,
1030 it's not incremented, so in order to compute the space reserved
1031 for them, it suffices to multiply the reloc count by the jump
1034 PR ld/13302: We start next_irelative_index at the end of .rela.plt
1035 so that R_{386,X86_64}_IRELATIVE entries come last. */
1036 if (htab
->elf
.srelplt
)
1038 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
1039 htab
->sgotplt_jump_table_size
1040 = elf_x86_compute_jump_table_size (htab
);
1041 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
1043 else if (htab
->elf
.irelplt
)
1044 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
1046 if (htab
->tlsdesc_plt
)
1048 /* NB: tlsdesc_plt is set only for x86-64. If we're not using
1049 lazy TLS relocations, don't generate the PLT and GOT entries
1051 if ((info
->flags
& DF_BIND_NOW
))
1052 htab
->tlsdesc_plt
= 0;
1055 htab
->tlsdesc_got
= htab
->elf
.sgot
->size
;
1056 htab
->elf
.sgot
->size
+= htab
->got_entry_size
;
1057 /* Reserve room for the initial entry.
1058 FIXME: we could probably do away with it in this case. */
1059 if (htab
->elf
.splt
->size
== 0)
1060 htab
->elf
.splt
->size
= htab
->plt
.plt_entry_size
;
1061 htab
->tlsdesc_plt
= htab
->elf
.splt
->size
;
1062 htab
->elf
.splt
->size
+= htab
->plt
.plt_entry_size
;
1066 if (htab
->elf
.sgotplt
)
1068 /* Don't allocate .got.plt section if there are no GOT nor PLT
1069 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
1070 if ((htab
->elf
.hgot
== NULL
1071 || !htab
->elf
.hgot
->ref_regular_nonweak
)
1072 && (htab
->elf
.sgotplt
->size
== bed
->got_header_size
)
1073 && (htab
->elf
.splt
== NULL
1074 || htab
->elf
.splt
->size
== 0)
1075 && (htab
->elf
.sgot
== NULL
1076 || htab
->elf
.sgot
->size
== 0)
1077 && (htab
->elf
.iplt
== NULL
1078 || htab
->elf
.iplt
->size
== 0)
1079 && (htab
->elf
.igotplt
== NULL
1080 || htab
->elf
.igotplt
->size
== 0))
1081 htab
->elf
.sgotplt
->size
= 0;
1084 if (_bfd_elf_eh_frame_present (info
))
1086 if (htab
->plt_eh_frame
!= NULL
1087 && htab
->elf
.splt
!= NULL
1088 && htab
->elf
.splt
->size
!= 0
1089 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
1090 htab
->plt_eh_frame
->size
= htab
->plt
.eh_frame_plt_size
;
1092 if (htab
->plt_got_eh_frame
!= NULL
1093 && htab
->plt_got
!= NULL
1094 && htab
->plt_got
->size
!= 0
1095 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
1096 htab
->plt_got_eh_frame
->size
1097 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1099 /* Unwind info for the second PLT and .plt.got sections are
1101 if (htab
->plt_second_eh_frame
!= NULL
1102 && htab
->plt_second
!= NULL
1103 && htab
->plt_second
->size
!= 0
1104 && !bfd_is_abs_section (htab
->plt_second
->output_section
))
1105 htab
->plt_second_eh_frame
->size
1106 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1109 /* We now have determined the sizes of the various dynamic sections.
1110 Allocate memory for them. */
1112 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1114 bfd_boolean strip_section
= TRUE
;
1116 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1119 if (s
== htab
->elf
.splt
1120 || s
== htab
->elf
.sgot
)
1122 /* Strip this section if we don't need it; see the
1124 /* We'd like to strip these sections if they aren't needed, but if
1125 we've exported dynamic symbols from them we must leave them.
1126 It's too late to tell BFD to get rid of the symbols. */
1128 if (htab
->elf
.hplt
!= NULL
)
1129 strip_section
= FALSE
;
1131 else if (s
== htab
->elf
.sgotplt
1132 || s
== htab
->elf
.iplt
1133 || s
== htab
->elf
.igotplt
1134 || s
== htab
->plt_second
1135 || s
== htab
->plt_got
1136 || s
== htab
->plt_eh_frame
1137 || s
== htab
->plt_got_eh_frame
1138 || s
== htab
->plt_second_eh_frame
1139 || s
== htab
->elf
.sdynbss
1140 || s
== htab
->elf
.sdynrelro
)
1142 /* Strip these too. */
1144 else if (htab
->is_reloc_section (bfd_get_section_name (dynobj
, s
)))
1147 && s
!= htab
->elf
.srelplt
1148 && s
!= htab
->srelplt2
)
1151 /* We use the reloc_count field as a counter if we need
1152 to copy relocs into the output file. */
1153 if (s
!= htab
->elf
.srelplt
)
1158 /* It's not one of our sections, so don't allocate space. */
1164 /* If we don't need this section, strip it from the
1165 output file. This is mostly to handle .rel.bss and
1166 .rel.plt. We must create both sections in
1167 create_dynamic_sections, because they must be created
1168 before the linker maps input sections to output
1169 sections. The linker does that before
1170 adjust_dynamic_symbol is called, and it is that
1171 function which decides whether anything needs to go
1172 into these sections. */
1174 s
->flags
|= SEC_EXCLUDE
;
1178 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1181 /* Allocate memory for the section contents. We use bfd_zalloc
1182 here in case unused entries are not reclaimed before the
1183 section's contents are written out. This should not happen,
1184 but this way if it does, we get a R_386_NONE or R_X86_64_NONE
1185 reloc instead of garbage. */
1186 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
1187 if (s
->contents
== NULL
)
1191 if (htab
->plt_eh_frame
!= NULL
1192 && htab
->plt_eh_frame
->contents
!= NULL
)
1194 memcpy (htab
->plt_eh_frame
->contents
,
1195 htab
->plt
.eh_frame_plt
,
1196 htab
->plt_eh_frame
->size
);
1197 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
1198 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
1201 if (htab
->plt_got_eh_frame
!= NULL
1202 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1204 memcpy (htab
->plt_got_eh_frame
->contents
,
1205 htab
->non_lazy_plt
->eh_frame_plt
,
1206 htab
->plt_got_eh_frame
->size
);
1207 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
1208 (htab
->plt_got_eh_frame
->contents
1209 + PLT_FDE_LEN_OFFSET
));
1212 if (htab
->plt_second_eh_frame
!= NULL
1213 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1215 memcpy (htab
->plt_second_eh_frame
->contents
,
1216 htab
->non_lazy_plt
->eh_frame_plt
,
1217 htab
->plt_second_eh_frame
->size
);
1218 bfd_put_32 (dynobj
, htab
->plt_second
->size
,
1219 (htab
->plt_second_eh_frame
->contents
1220 + PLT_FDE_LEN_OFFSET
));
1223 if (htab
->elf
.dynamic_sections_created
)
1225 /* Add some entries to the .dynamic section. We fill in the
1226 values later, in elf_{i386,x86_64}_finish_dynamic_sections,
1227 but we must add the entries now so that we get the correct
1228 size for the .dynamic section. The DT_DEBUG entry is filled
1229 in by the dynamic linker and used by the debugger. */
1230 #define add_dynamic_entry(TAG, VAL) \
1231 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1233 if (bfd_link_executable (info
))
1235 if (!add_dynamic_entry (DT_DEBUG
, 0))
1239 if (htab
->elf
.splt
->size
!= 0)
1241 /* DT_PLTGOT is used by prelink even if there is no PLT
1243 if (!add_dynamic_entry (DT_PLTGOT
, 0))
1247 if (htab
->elf
.srelplt
->size
!= 0)
1249 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
1250 || !add_dynamic_entry (DT_PLTREL
, htab
->dt_reloc
)
1251 || !add_dynamic_entry (DT_JMPREL
, 0))
1255 if (htab
->tlsdesc_plt
1256 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
1257 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
1262 if (!add_dynamic_entry (htab
->dt_reloc
, 0)
1263 || !add_dynamic_entry (htab
->dt_reloc_sz
, 0)
1264 || !add_dynamic_entry (htab
->dt_reloc_ent
,
1265 htab
->sizeof_reloc
))
1268 /* If any dynamic relocs apply to a read-only section,
1269 then we need a DT_TEXTREL entry. */
1270 if ((info
->flags
& DF_TEXTREL
) == 0)
1271 elf_link_hash_traverse (&htab
->elf
,
1272 _bfd_x86_elf_readonly_dynrelocs
,
1275 if ((info
->flags
& DF_TEXTREL
) != 0)
1277 if (htab
->readonly_dynrelocs_against_ifunc
)
1279 info
->callbacks
->einfo
1280 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
1281 bfd_set_error (bfd_error_bad_value
);
1285 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1289 if (htab
->is_vxworks
1290 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
1293 #undef add_dynamic_entry
1299 _bfd_x86_elf_always_size_sections (bfd
*output_bfd
,
1300 struct bfd_link_info
*info
)
1302 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
1306 struct elf_link_hash_entry
*tlsbase
;
1308 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
1309 "_TLS_MODULE_BASE_",
1310 FALSE
, FALSE
, FALSE
);
1312 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
1314 struct elf_x86_link_hash_table
*htab
;
1315 struct bfd_link_hash_entry
*bh
= NULL
;
1316 const struct elf_backend_data
*bed
1317 = get_elf_backend_data (output_bfd
);
1319 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1323 if (!(_bfd_generic_link_add_one_symbol
1324 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1325 tls_sec
, 0, NULL
, FALSE
,
1326 bed
->collect
, &bh
)))
1329 htab
->tls_module_base
= bh
;
1331 tlsbase
= (struct elf_link_hash_entry
*)bh
;
1332 tlsbase
->def_regular
= 1;
1333 tlsbase
->other
= STV_HIDDEN
;
1334 tlsbase
->root
.linker_def
= 1;
1335 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1343 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
1344 const Elf_Internal_Sym
*isym
,
1345 bfd_boolean definition
,
1346 bfd_boolean dynamic ATTRIBUTE_UNUSED
)
1350 struct elf_x86_link_hash_entry
*eh
1351 = (struct elf_x86_link_hash_entry
*) h
;
1352 eh
->def_protected
= (ELF_ST_VISIBILITY (isym
->st_other
)
1357 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1360 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info
*info
,
1361 struct elf_link_hash_entry
*dir
,
1362 struct elf_link_hash_entry
*ind
)
1364 struct elf_x86_link_hash_entry
*edir
, *eind
;
1366 edir
= (struct elf_x86_link_hash_entry
*) dir
;
1367 eind
= (struct elf_x86_link_hash_entry
*) ind
;
1369 if (eind
->dyn_relocs
!= NULL
)
1371 if (edir
->dyn_relocs
!= NULL
)
1373 struct elf_dyn_relocs
**pp
;
1374 struct elf_dyn_relocs
*p
;
1376 /* Add reloc counts against the indirect sym to the direct sym
1377 list. Merge any entries against the same section. */
1378 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
1380 struct elf_dyn_relocs
*q
;
1382 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
1383 if (q
->sec
== p
->sec
)
1385 q
->pc_count
+= p
->pc_count
;
1386 q
->count
+= p
->count
;
1393 *pp
= edir
->dyn_relocs
;
1396 edir
->dyn_relocs
= eind
->dyn_relocs
;
1397 eind
->dyn_relocs
= NULL
;
1400 if (ind
->root
.type
== bfd_link_hash_indirect
1401 && dir
->got
.refcount
<= 0)
1403 edir
->tls_type
= eind
->tls_type
;
1404 eind
->tls_type
= GOT_UNKNOWN
;
1407 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1408 generate a R_386_COPY reloc. */
1409 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1411 edir
->has_got_reloc
|= eind
->has_got_reloc
;
1412 edir
->has_non_got_reloc
|= eind
->has_non_got_reloc
;
1414 if (ELIMINATE_COPY_RELOCS
1415 && ind
->root
.type
!= bfd_link_hash_indirect
1416 && dir
->dynamic_adjusted
)
1418 /* If called to transfer flags for a weakdef during processing
1419 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1420 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1421 if (dir
->versioned
!= versioned_hidden
)
1422 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1423 dir
->ref_regular
|= ind
->ref_regular
;
1424 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1425 dir
->needs_plt
|= ind
->needs_plt
;
1426 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1430 if (eind
->func_pointer_refcount
> 0)
1432 edir
->func_pointer_refcount
+= eind
->func_pointer_refcount
;
1433 eind
->func_pointer_refcount
= 0;
1436 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1440 /* Remove undefined weak symbol from the dynamic symbol table if it
1441 is resolved to 0. */
1444 _bfd_x86_elf_fixup_symbol (struct bfd_link_info
*info
,
1445 struct elf_link_hash_entry
*h
)
1447 if (h
->dynindx
!= -1)
1449 const struct elf_backend_data
*bed
1450 = get_elf_backend_data (info
->output_bfd
);
1451 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
1453 elf_x86_hash_entry (h
)->has_got_reloc
,
1454 elf_x86_hash_entry (h
)))
1457 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
1464 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1467 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry
*h
)
1469 if (h
->plt
.offset
!= (bfd_vma
) -1
1471 && !h
->pointer_equality_needed
)
1474 return _bfd_elf_hash_symbol (h
);
1477 /* Adjust a symbol defined by a dynamic object and referenced by a
1478 regular object. The current definition is in some section of the
1479 dynamic object, but we're not including those sections. We have to
1480 change the definition to something the rest of the link can
1484 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1485 struct elf_link_hash_entry
*h
)
1487 struct elf_x86_link_hash_table
*htab
;
1489 struct elf_x86_link_hash_entry
*eh
;
1490 struct elf_dyn_relocs
*p
;
1491 const struct elf_backend_data
*bed
1492 = get_elf_backend_data (info
->output_bfd
);
1494 /* STT_GNU_IFUNC symbol must go through PLT. */
1495 if (h
->type
== STT_GNU_IFUNC
)
1497 /* All local STT_GNU_IFUNC references must be treate as local
1498 calls via local PLT. */
1500 && SYMBOL_CALLS_LOCAL (info
, h
))
1502 bfd_size_type pc_count
= 0, count
= 0;
1503 struct elf_dyn_relocs
**pp
;
1505 eh
= (struct elf_x86_link_hash_entry
*) h
;
1506 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1508 pc_count
+= p
->pc_count
;
1509 p
->count
-= p
->pc_count
;
1518 if (pc_count
|| count
)
1523 /* Increment PLT reference count only for PC-relative
1526 if (h
->plt
.refcount
<= 0)
1527 h
->plt
.refcount
= 1;
1529 h
->plt
.refcount
+= 1;
1534 if (h
->plt
.refcount
<= 0)
1536 h
->plt
.offset
= (bfd_vma
) -1;
1542 /* If this is a function, put it in the procedure linkage table. We
1543 will fill in the contents of the procedure linkage table later,
1544 when we know the address of the .got section. */
1545 if (h
->type
== STT_FUNC
1548 if (h
->plt
.refcount
<= 0
1549 || SYMBOL_CALLS_LOCAL (info
, h
)
1550 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1551 && h
->root
.type
== bfd_link_hash_undefweak
))
1553 /* This case can occur if we saw a PLT32 reloc in an input
1554 file, but the symbol was never referred to by a dynamic
1555 object, or if all references were garbage collected. In
1556 such a case, we don't actually need to build a procedure
1557 linkage table, and we can just do a PC32 reloc instead. */
1558 h
->plt
.offset
= (bfd_vma
) -1;
1565 /* It's possible that we incorrectly decided a .plt reloc was needed
1566 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1567 check_relocs. We can't decide accurately between function and
1568 non-function syms in check-relocs; Objects loaded later in
1569 the link may change h->type. So fix it now. */
1570 h
->plt
.offset
= (bfd_vma
) -1;
1572 eh
= (struct elf_x86_link_hash_entry
*) h
;
1574 /* If this is a weak symbol, and there is a real definition, the
1575 processor independent code will have arranged for us to see the
1576 real definition first, and we can just use the same value. */
1577 if (h
->u
.weakdef
!= NULL
)
1579 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1580 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1581 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1582 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1583 if (ELIMINATE_COPY_RELOCS
1584 || info
->nocopyreloc
1585 || SYMBOL_NO_COPYRELOC (info
, eh
))
1587 /* NB: needs_copy is always 0 for i386. */
1588 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
1589 eh
->needs_copy
= h
->u
.weakdef
->needs_copy
;
1594 /* This is a reference to a symbol defined by a dynamic object which
1595 is not a function. */
1597 /* If we are creating a shared library, we must presume that the
1598 only references to the symbol are via the global offset table.
1599 For such cases we need not do anything here; the relocations will
1600 be handled correctly by relocate_section. */
1601 if (!bfd_link_executable (info
))
1604 /* If there are no references to this symbol that do not use the
1605 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1606 reloc. NB: gotoff_ref is always 0 for x86-64. */
1607 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
1610 /* If -z nocopyreloc was given, we won't generate them either. */
1611 if (info
->nocopyreloc
|| SYMBOL_NO_COPYRELOC (info
, eh
))
1617 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1621 /* If there aren't any dynamic relocs in read-only sections nor
1622 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1623 avoid the copy reloc. This doesn't work on VxWorks, where we can
1624 not have dynamic relocations (other than copy and jump slot
1625 relocations) in an executable. */
1626 if (ELIMINATE_COPY_RELOCS
1627 && (bed
->target_id
== X86_64_ELF_DATA
1629 && !htab
->is_vxworks
)))
1631 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1633 s
= p
->sec
->output_section
;
1634 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1638 /* If we didn't find any dynamic relocs in read-only sections,
1639 then we'll be keeping the dynamic relocs and avoiding the copy
1648 /* We must allocate the symbol in our .dynbss section, which will
1649 become part of the .bss section of the executable. There will be
1650 an entry for this symbol in the .dynsym section. The dynamic
1651 object will contain position independent code, so all references
1652 from the dynamic object to this symbol will go through the global
1653 offset table. The dynamic linker will use the .dynsym entry to
1654 determine the address it must put in the global offset table, so
1655 both the dynamic object and the regular object will refer to the
1656 same memory location for the variable. */
1658 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1659 dynamic linker to copy the initial value out of the dynamic object
1660 and into the runtime process image. */
1661 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
1663 s
= htab
->elf
.sdynrelro
;
1664 srel
= htab
->elf
.sreldynrelro
;
1668 s
= htab
->elf
.sdynbss
;
1669 srel
= htab
->elf
.srelbss
;
1671 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
1673 srel
->size
+= htab
->sizeof_reloc
;
1677 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
1680 /* Return the section that should be marked against GC for a given
1684 _bfd_x86_elf_gc_mark_hook (asection
*sec
,
1685 struct bfd_link_info
*info
,
1686 Elf_Internal_Rela
*rel
,
1687 struct elf_link_hash_entry
*h
,
1688 Elf_Internal_Sym
*sym
)
1690 /* Compiler should optimize this out. */
1691 if (((unsigned int) R_X86_64_GNU_VTINHERIT
1692 != (unsigned int) R_386_GNU_VTINHERIT
)
1693 || ((unsigned int) R_X86_64_GNU_VTENTRY
1694 != (unsigned int) R_386_GNU_VTENTRY
))
1698 switch (ELF32_R_TYPE (rel
->r_info
))
1700 case R_X86_64_GNU_VTINHERIT
:
1701 case R_X86_64_GNU_VTENTRY
:
1705 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1709 elf_i386_get_plt_got_vma (struct elf_x86_plt
*plt_p ATTRIBUTE_UNUSED
,
1711 bfd_vma offset ATTRIBUTE_UNUSED
,
1714 return got_addr
+ off
;
1718 elf_x86_64_get_plt_got_vma (struct elf_x86_plt
*plt_p
,
1721 bfd_vma got_addr ATTRIBUTE_UNUSED
)
1723 return plt_p
->sec
->vma
+ offset
+ off
+ plt_p
->plt_got_insn_size
;
1727 elf_i386_valid_plt_reloc_p (unsigned int type
)
1729 return (type
== R_386_JUMP_SLOT
1730 || type
== R_386_GLOB_DAT
1731 || type
== R_386_IRELATIVE
);
1735 elf_x86_64_valid_plt_reloc_p (unsigned int type
)
1737 return (type
== R_X86_64_JUMP_SLOT
1738 || type
== R_X86_64_GLOB_DAT
1739 || type
== R_X86_64_IRELATIVE
);
1743 _bfd_x86_elf_get_synthetic_symtab (bfd
*abfd
,
1747 struct elf_x86_plt plts
[],
1751 long size
, i
, n
, len
;
1753 unsigned int plt_got_offset
, plt_entry_size
;
1755 bfd_byte
*plt_contents
;
1757 arelent
**dynrelbuf
, *p
;
1759 const struct elf_backend_data
*bed
;
1760 bfd_vma (*get_plt_got_vma
) (struct elf_x86_plt
*, bfd_vma
, bfd_vma
,
1762 bfd_boolean (*valid_plt_reloc_p
) (unsigned int);
1767 dynrelbuf
= (arelent
**) bfd_malloc (relsize
);
1768 if (dynrelbuf
== NULL
)
1771 dynrelcount
= bfd_canonicalize_dynamic_reloc (abfd
, dynrelbuf
,
1774 /* Sort the relocs by address. */
1775 qsort (dynrelbuf
, dynrelcount
, sizeof (arelent
*),
1776 _bfd_x86_elf_compare_relocs
);
1778 size
= count
* sizeof (asymbol
);
1780 /* Allocate space for @plt suffixes. */
1782 for (i
= 0; i
< dynrelcount
; i
++)
1785 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
1787 size
+= sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd
);
1790 s
= *ret
= (asymbol
*) bfd_zmalloc (size
);
1794 bed
= get_elf_backend_data (abfd
);
1796 if (bed
->target_id
== X86_64_ELF_DATA
)
1798 get_plt_got_vma
= elf_x86_64_get_plt_got_vma
;
1799 valid_plt_reloc_p
= elf_x86_64_valid_plt_reloc_p
;
1803 get_plt_got_vma
= elf_i386_get_plt_got_vma
;
1804 valid_plt_reloc_p
= elf_i386_valid_plt_reloc_p
;
1807 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
1809 asection
*sec
= bfd_get_section_by_name (abfd
, ".got.plt");
1811 got_addr
= sec
->vma
;
1814 sec
= bfd_get_section_by_name (abfd
, ".got");
1816 got_addr
= sec
->vma
;
1819 if (got_addr
== (bfd_vma
) -1)
1824 /* Check for each PLT section. */
1825 names
= (char *) (s
+ count
);
1828 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
1829 if ((plt_contents
= plts
[j
].contents
) != NULL
)
1834 struct elf_x86_plt
*plt_p
= &plts
[j
];
1836 plt_got_offset
= plt_p
->plt_got_offset
;
1837 plt_entry_size
= plt_p
->plt_entry_size
;
1841 if ((plt_p
->type
& plt_lazy
))
1843 /* Skip PLT0 in lazy PLT. */
1845 offset
= plt_entry_size
;
1853 /* Check each PLT entry against dynamic relocations. */
1854 for (; k
< plt_p
->count
; k
++)
1860 /* Get the GOT offset for i386 or the PC-relative offset
1861 for x86-64, a signed 32-bit integer. */
1862 off
= H_GET_32 (abfd
, (plt_contents
+ offset
1864 got_vma
= get_plt_got_vma (plt_p
, off
, offset
, got_addr
);
1866 /* Binary search. */
1870 while ((min
+ 1) < max
)
1874 mid
= (min
+ max
) / 2;
1876 if (got_vma
> r
->address
)
1878 else if (got_vma
< r
->address
)
1887 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
1888 if (got_vma
== p
->address
1890 && valid_plt_reloc_p (p
->howto
->type
))
1892 *s
= **p
->sym_ptr_ptr
;
1893 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
1894 set. Since we are defining a symbol, ensure one
1896 if ((s
->flags
& BSF_LOCAL
) == 0)
1897 s
->flags
|= BSF_GLOBAL
;
1898 s
->flags
|= BSF_SYNTHETIC
;
1899 /* This is no longer a section symbol. */
1900 s
->flags
&= ~BSF_SECTION_SYM
;
1902 s
->the_bfd
= plt
->owner
;
1906 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
1907 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
1913 memcpy (names
, "+0x", sizeof ("+0x") - 1);
1914 names
+= sizeof ("+0x") - 1;
1915 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
1916 for (a
= buf
; *a
== '0'; ++a
)
1919 memcpy (names
, a
, size
);
1922 memcpy (names
, "@plt", sizeof ("@plt"));
1923 names
+= sizeof ("@plt");
1927 offset
+= plt_entry_size
;
1931 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
1940 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
1941 if (plts
[j
].contents
!= NULL
)
1942 free (plts
[j
].contents
);
1949 /* Parse x86 GNU properties. */
1951 enum elf_property_kind
1952 _bfd_x86_elf_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
1953 bfd_byte
*ptr
, unsigned int datasz
)
1959 case GNU_PROPERTY_X86_ISA_1_USED
:
1960 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
1961 case GNU_PROPERTY_X86_FEATURE_1_AND
:
1965 ((type
== GNU_PROPERTY_X86_ISA_1_USED
1966 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
1967 : (type
== GNU_PROPERTY_X86_ISA_1_NEEDED
1968 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
1969 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
1971 return property_corrupt
;
1973 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
1974 /* Combine properties of the same type. */
1975 prop
->u
.number
|= bfd_h_get_32 (abfd
, ptr
);
1976 prop
->pr_kind
= property_number
;
1980 return property_ignored
;
1983 return property_number
;
1986 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
1987 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
1988 should be merged with ABFD. */
1991 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info
*info
,
1992 bfd
*abfd ATTRIBUTE_UNUSED
,
1993 elf_property
*aprop
,
1994 elf_property
*bprop
)
1996 unsigned int number
, features
;
1997 bfd_boolean updated
= FALSE
;
1998 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
2002 case GNU_PROPERTY_X86_ISA_1_USED
:
2003 case GNU_PROPERTY_X86_ISA_1_NEEDED
:
2004 if (aprop
!= NULL
&& bprop
!= NULL
)
2006 number
= aprop
->u
.number
;
2007 aprop
->u
.number
= number
| bprop
->u
.number
;
2008 updated
= number
!= (unsigned int) aprop
->u
.number
;
2012 /* Return TRUE if APROP is NULL to indicate that BPROP should
2013 be added to ABFD. */
2014 updated
= aprop
== NULL
;
2018 case GNU_PROPERTY_X86_FEATURE_1_AND
:
2019 /* Only one of APROP and BPROP can be NULL:
2020 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2021 2. If APROP is NULL, remove x86 feature.
2022 3. Otherwise, do nothing.
2024 if (aprop
!= NULL
&& bprop
!= NULL
)
2028 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2030 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2031 number
= aprop
->u
.number
;
2032 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2033 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2034 aprop
->u
.number
= (number
& bprop
->u
.number
) | features
;
2035 updated
= number
!= (unsigned int) aprop
->u
.number
;
2036 /* Remove the property if all feature bits are cleared. */
2037 if (aprop
->u
.number
== 0)
2038 aprop
->pr_kind
= property_remove
;
2044 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2046 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2049 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2050 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2053 number
= aprop
->u
.number
;
2054 aprop
->u
.number
= number
| features
;
2055 updated
= number
!= (unsigned int) aprop
->u
.number
;
2059 bprop
->u
.number
|= features
;
2063 else if (aprop
!= NULL
)
2065 aprop
->pr_kind
= property_remove
;
2072 /* Never should happen. */
2079 /* Set up x86 GNU properties. Return the first relocatable ELF input
2080 with GNU properties if found. Otherwise, return NULL. */
2083 _bfd_x86_elf_link_setup_gnu_properties
2084 (struct bfd_link_info
*info
,
2085 struct elf_x86_plt_layout_table
*plt_layout
)
2087 bfd_boolean normal_target
;
2088 bfd_boolean lazy_plt
;
2089 asection
*sec
, *pltsec
;
2091 bfd_boolean use_ibt_plt
;
2092 unsigned int plt_alignment
, features
;
2093 struct elf_x86_link_hash_table
*htab
;
2097 const struct elf_backend_data
*bed
;
2098 unsigned int class_align
= ABI_64_P (info
->output_bfd
) ? 3 : 2;
2099 unsigned int got_align
;
2103 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2105 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2107 /* Find a normal input file with GNU property note. */
2108 for (pbfd
= info
->input_bfds
;
2110 pbfd
= pbfd
->link
.next
)
2111 if (bfd_get_flavour (pbfd
) == bfd_target_elf_flavour
2112 && bfd_count_sections (pbfd
) != 0)
2116 if (elf_properties (pbfd
) != NULL
)
2120 if (ebfd
!= NULL
&& features
)
2122 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
2123 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2124 prop
= _bfd_elf_get_property (ebfd
,
2125 GNU_PROPERTY_X86_FEATURE_1_AND
,
2127 prop
->u
.number
|= features
;
2128 prop
->pr_kind
= property_number
;
2130 /* Create the GNU property note section if needed. */
2133 sec
= bfd_make_section_with_flags (ebfd
,
2134 NOTE_GNU_PROPERTY_SECTION_NAME
,
2142 info
->callbacks
->einfo (_("%F: failed to create GNU property section\n"));
2144 if (!bfd_set_section_alignment (ebfd
, sec
, class_align
))
2147 info
->callbacks
->einfo (_("%F%A: failed to align section\n"),
2151 elf_section_type (sec
) = SHT_NOTE
;
2155 pbfd
= _bfd_elf_link_setup_gnu_properties (info
);
2157 if (bfd_link_relocatable (info
))
2160 bed
= get_elf_backend_data (info
->output_bfd
);
2162 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2166 htab
->is_vxworks
= plt_layout
->is_vxworks
;
2168 use_ibt_plt
= info
->ibtplt
|| info
->ibt
;
2169 if (!use_ibt_plt
&& pbfd
!= NULL
)
2171 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2172 elf_property_list
*p
;
2174 /* The property list is sorted in order of type. */
2175 for (p
= elf_properties (pbfd
); p
; p
= p
->next
)
2177 if (GNU_PROPERTY_X86_FEATURE_1_AND
== p
->property
.pr_type
)
2179 use_ibt_plt
= !!(p
->property
.u
.number
2180 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
2183 else if (GNU_PROPERTY_X86_FEATURE_1_AND
< p
->property
.pr_type
)
2188 dynobj
= htab
->elf
.dynobj
;
2190 /* Set htab->elf.dynobj here so that there is no need to check and
2191 set it in check_relocs. */
2196 htab
->elf
.dynobj
= pbfd
;
2203 /* Find a normal input file to hold linker created
2205 for (abfd
= info
->input_bfds
;
2207 abfd
= abfd
->link
.next
)
2208 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2210 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0)
2212 htab
->elf
.dynobj
= abfd
;
2219 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2220 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2221 canonical function address. */
2222 htab
->plt
.has_plt0
= 1;
2223 normal_target
= plt_layout
->normal_target
;
2229 htab
->lazy_plt
= plt_layout
->lazy_ibt_plt
;
2230 htab
->non_lazy_plt
= plt_layout
->non_lazy_ibt_plt
;
2234 htab
->lazy_plt
= plt_layout
->lazy_plt
;
2235 htab
->non_lazy_plt
= plt_layout
->non_lazy_plt
;
2240 htab
->lazy_plt
= plt_layout
->lazy_plt
;
2241 htab
->non_lazy_plt
= NULL
;
2244 pltsec
= htab
->elf
.splt
;
2246 /* If the non-lazy PLT is available, use it for all PLT entries if
2247 there are no PLT0 or no .plt section. */
2248 if (htab
->non_lazy_plt
!= NULL
2249 && (!htab
->plt
.has_plt0
|| pltsec
== NULL
))
2252 if (bfd_link_pic (info
))
2253 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
2255 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->plt_entry
;
2256 htab
->plt
.plt_entry_size
= htab
->non_lazy_plt
->plt_entry_size
;
2257 htab
->plt
.plt_got_offset
= htab
->non_lazy_plt
->plt_got_offset
;
2258 htab
->plt
.plt_got_insn_size
2259 = htab
->non_lazy_plt
->plt_got_insn_size
;
2260 htab
->plt
.eh_frame_plt_size
2261 = htab
->non_lazy_plt
->eh_frame_plt_size
;
2262 htab
->plt
.eh_frame_plt
= htab
->non_lazy_plt
->eh_frame_plt
;
2267 if (bfd_link_pic (info
))
2269 htab
->plt
.plt0_entry
= htab
->lazy_plt
->pic_plt0_entry
;
2270 htab
->plt
.plt_entry
= htab
->lazy_plt
->pic_plt_entry
;
2274 htab
->plt
.plt0_entry
= htab
->lazy_plt
->plt0_entry
;
2275 htab
->plt
.plt_entry
= htab
->lazy_plt
->plt_entry
;
2277 htab
->plt
.plt_entry_size
= htab
->lazy_plt
->plt_entry_size
;
2278 htab
->plt
.plt_got_offset
= htab
->lazy_plt
->plt_got_offset
;
2279 htab
->plt
.plt_got_insn_size
2280 = htab
->lazy_plt
->plt_got_insn_size
;
2281 htab
->plt
.eh_frame_plt_size
2282 = htab
->lazy_plt
->eh_frame_plt_size
;
2283 htab
->plt
.eh_frame_plt
= htab
->lazy_plt
->eh_frame_plt
;
2286 /* Return if there are no normal input files. */
2290 if (htab
->is_vxworks
2291 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
2294 info
->callbacks
->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
2298 /* Since create_dynamic_sections isn't always called, but GOT
2299 relocations need GOT relocations, create them here so that we
2300 don't need to do it in check_relocs. */
2301 if (htab
->elf
.sgot
== NULL
2302 && !_bfd_elf_create_got_section (dynobj
, info
))
2303 info
->callbacks
->einfo (_("%F: failed to create GOT sections\n"));
2305 got_align
= (bed
->target_id
== X86_64_ELF_DATA
) ? 3 : 2;
2307 /* Align .got and .got.plt sections to their entry size. Do it here
2308 instead of in create_dynamic_sections so that they are always
2309 properly aligned even if create_dynamic_sections isn't called. */
2310 sec
= htab
->elf
.sgot
;
2311 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2312 goto error_alignment
;
2314 sec
= htab
->elf
.sgotplt
;
2315 if (!bfd_set_section_alignment (dynobj
, sec
, got_align
))
2316 goto error_alignment
;
2318 /* Create the ifunc sections here so that check_relocs can be
2320 if (!_bfd_elf_create_ifunc_sections (dynobj
, info
))
2321 info
->callbacks
->einfo (_("%F: failed to create ifunc sections\n"));
2323 plt_alignment
= bfd_log2 (htab
->plt
.plt_entry_size
);
2327 /* Whe creating executable, set the contents of the .interp
2328 section to the interpreter. */
2329 if (bfd_link_executable (info
) && !info
->nointerp
)
2331 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
2334 s
->size
= htab
->dynamic_interpreter_size
;
2335 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2339 /* Don't change PLT section alignment for NaCl since it uses
2340 64-byte PLT entry and sets PLT section alignment to 32
2341 bytes. Don't create additional PLT sections for NaCl. */
2344 flagword pltflags
= (bed
->dynamic_sec_flags
2349 unsigned int non_lazy_plt_alignment
2350 = bfd_log2 (htab
->non_lazy_plt
->plt_entry_size
);
2353 if (!bfd_set_section_alignment (sec
->owner
, sec
,
2355 goto error_alignment
;
2357 /* Create the GOT procedure linkage table. */
2358 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2362 info
->callbacks
->einfo (_("%F: failed to create GOT PLT section\n"));
2364 if (!bfd_set_section_alignment (dynobj
, sec
,
2365 non_lazy_plt_alignment
))
2366 goto error_alignment
;
2368 htab
->plt_got
= sec
;
2376 /* Create the second PLT for Intel IBT support. IBT
2377 PLT is supported only for non-NaCl target and is
2378 is needed only for lazy binding. */
2379 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2383 info
->callbacks
->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
2385 if (!bfd_set_section_alignment (dynobj
, sec
,
2387 goto error_alignment
;
2389 else if (info
->bndplt
&& ABI_64_P (dynobj
))
2391 /* Create the second PLT for Intel MPX support. MPX
2392 PLT is supported only for non-NaCl target in 64-bit
2393 mode and is needed only for lazy binding. */
2394 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2398 info
->callbacks
->einfo (_("%F: failed to create BND PLT section\n"));
2400 if (!bfd_set_section_alignment (dynobj
, sec
,
2401 non_lazy_plt_alignment
))
2402 goto error_alignment
;
2405 htab
->plt_second
= sec
;
2409 if (!info
->no_ld_generated_unwind_info
)
2411 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2412 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2413 | SEC_LINKER_CREATED
);
2415 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2419 info
->callbacks
->einfo (_("%F: failed to create PLT .eh_frame section\n"));
2421 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2422 goto error_alignment
;
2424 htab
->plt_eh_frame
= sec
;
2426 if (htab
->plt_got
!= NULL
)
2428 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2432 info
->callbacks
->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
2434 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2435 goto error_alignment
;
2437 htab
->plt_got_eh_frame
= sec
;
2440 if (htab
->plt_second
!= NULL
)
2442 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2446 info
->callbacks
->einfo (_("%F: failed to create the second PLT .eh_frame section\n"));
2448 if (!bfd_set_section_alignment (dynobj
, sec
, class_align
))
2449 goto error_alignment
;
2451 htab
->plt_second_eh_frame
= sec
;
2458 /* The .iplt section is used for IFUNC symbols in static
2460 sec
= htab
->elf
.iplt
;
2462 && !bfd_set_section_alignment (sec
->owner
, sec
,
2464 goto error_alignment
;