1 /* x86 specific support for ELF
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
21 #include "elfxx-x86.h"
22 #include "elf-vxworks.h"
25 #include "elf/x86-64.h"
27 /* The name of the dynamic interpreter. This is put in the .interp
30 #define ELF32_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
31 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
32 #define ELFX32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
35 _bfd_x86_elf_mkobject (bfd
*abfd
)
37 return bfd_elf_allocate_object (abfd
,
38 sizeof (struct elf_x86_obj_tdata
),
39 get_elf_backend_data (abfd
)->target_id
);
42 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
43 executables. Rather than setting it to the beginning of the TLS
44 section, we have to set it to the end. This function may be called
45 multiple times, it is idempotent. */
48 _bfd_x86_elf_set_tls_module_base (struct bfd_link_info
*info
)
50 struct elf_x86_link_hash_table
*htab
;
51 struct bfd_link_hash_entry
*base
;
52 const struct elf_backend_data
*bed
;
54 if (!bfd_link_executable (info
))
57 bed
= get_elf_backend_data (info
->output_bfd
);
58 htab
= elf_x86_hash_table (info
, bed
->target_id
);
62 base
= htab
->tls_module_base
;
66 base
->u
.def
.value
= htab
->elf
.tls_size
;
69 /* Return the base VMA address which should be subtracted from real addresses
70 when resolving @dtpoff relocation.
71 This is PT_TLS segment p_vaddr. */
74 _bfd_x86_elf_dtpoff_base (struct bfd_link_info
*info
)
76 /* If tls_sec is NULL, we should have signalled an error already. */
77 if (elf_hash_table (info
)->tls_sec
== NULL
)
79 return elf_hash_table (info
)->tls_sec
->vma
;
82 /* Allocate space in .plt, .got and associated reloc sections for
86 elf_x86_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
88 struct bfd_link_info
*info
;
89 struct elf_x86_link_hash_table
*htab
;
90 struct elf_x86_link_hash_entry
*eh
;
91 struct elf_dyn_relocs
*p
;
92 unsigned int plt_entry_size
;
93 bfd_boolean resolved_to_zero
;
94 const struct elf_backend_data
*bed
;
96 if (h
->root
.type
== bfd_link_hash_indirect
)
99 eh
= (struct elf_x86_link_hash_entry
*) h
;
101 info
= (struct bfd_link_info
*) inf
;
102 bed
= get_elf_backend_data (info
->output_bfd
);
103 htab
= elf_x86_hash_table (info
, bed
->target_id
);
107 plt_entry_size
= htab
->plt
.plt_entry_size
;
109 resolved_to_zero
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
);
111 /* We can't use the GOT PLT if pointer equality is needed since
112 finish_dynamic_symbol won't clear symbol value and the dynamic
113 linker won't update the GOT slot. We will get into an infinite
115 if (htab
->plt_got
!= NULL
116 && h
->type
!= STT_GNU_IFUNC
117 && !h
->pointer_equality_needed
118 && h
->plt
.refcount
> 0
119 && h
->got
.refcount
> 0)
121 /* Don't use the regular PLT if there are both GOT and GOTPLT
123 h
->plt
.offset
= (bfd_vma
) -1;
125 /* Use the GOT PLT. */
126 eh
->plt_got
.refcount
= 1;
129 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
130 here if it is defined and referenced in a non-shared object. */
131 if (h
->type
== STT_GNU_IFUNC
134 if (_bfd_elf_allocate_ifunc_dyn_relocs (info
, h
, &h
->dyn_relocs
,
138 htab
->got_entry_size
,
141 asection
*s
= htab
->plt_second
;
142 if (h
->plt
.offset
!= (bfd_vma
) -1 && s
!= NULL
)
144 /* Use the second PLT section if it is created. */
145 eh
->plt_second
.offset
= s
->size
;
147 /* Make room for this entry in the second PLT section. */
148 s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
156 /* Don't create the PLT entry if there are only function pointer
157 relocations which can be resolved at run-time. */
158 else if (htab
->elf
.dynamic_sections_created
159 && (h
->plt
.refcount
> 0
160 || eh
->plt_got
.refcount
> 0))
162 bfd_boolean use_plt_got
= eh
->plt_got
.refcount
> 0;
164 /* Make sure this symbol is output as a dynamic symbol.
165 Undefined weak syms won't yet be marked as dynamic. */
169 && h
->root
.type
== bfd_link_hash_undefweak
)
171 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
175 if (bfd_link_pic (info
)
176 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
178 asection
*s
= htab
->elf
.splt
;
179 asection
*second_s
= htab
->plt_second
;
180 asection
*got_s
= htab
->plt_got
;
183 /* If this is the first .plt entry, make room for the special
184 first entry. The .plt section is used by prelink to undo
185 prelinking for dynamic relocations. */
187 s
->size
= htab
->plt
.has_plt0
* plt_entry_size
;
190 eh
->plt_got
.offset
= got_s
->size
;
193 h
->plt
.offset
= s
->size
;
195 eh
->plt_second
.offset
= second_s
->size
;
198 /* If this symbol is not defined in a regular file, and we are
199 generating PDE, then set the symbol to this location in the
200 .plt. This is required to make function pointers compare
201 as equal between PDE and the shared library.
203 NB: If PLT is PC-relative, we can use the .plt in PIE for
207 else if (htab
->pcrel_plt
)
208 use_plt
= ! bfd_link_dll (info
);
210 use_plt
= bfd_link_pde (info
);
215 /* We need to make a call to the entry of the GOT PLT
216 instead of regular PLT entry. */
217 h
->root
.u
.def
.section
= got_s
;
218 h
->root
.u
.def
.value
= eh
->plt_got
.offset
;
224 /* We need to make a call to the entry of the
225 second PLT instead of regular PLT entry. */
226 h
->root
.u
.def
.section
= second_s
;
227 h
->root
.u
.def
.value
= eh
->plt_second
.offset
;
231 h
->root
.u
.def
.section
= s
;
232 h
->root
.u
.def
.value
= h
->plt
.offset
;
237 /* Make room for this entry. */
239 got_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
242 s
->size
+= plt_entry_size
;
244 second_s
->size
+= htab
->non_lazy_plt
->plt_entry_size
;
246 /* We also need to make an entry in the .got.plt section,
247 which will be placed in the .got section by the linker
249 htab
->elf
.sgotplt
->size
+= htab
->got_entry_size
;
251 /* There should be no PLT relocation against resolved
252 undefined weak symbol in executable. */
253 if (!resolved_to_zero
)
255 /* We also need to make an entry in the .rel.plt
257 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
258 htab
->elf
.srelplt
->reloc_count
++;
262 if (htab
->elf
.target_os
== is_vxworks
&& !bfd_link_pic (info
))
264 /* VxWorks has a second set of relocations for each PLT entry
265 in executables. They go in a separate relocation section,
266 which is processed by the kernel loader. */
268 /* There are two relocations for the initial PLT entry: an
269 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
270 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
272 asection
*srelplt2
= htab
->srelplt2
;
273 if (h
->plt
.offset
== plt_entry_size
)
274 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
276 /* There are two extra relocations for each subsequent PLT entry:
277 an R_386_32 relocation for the GOT entry, and an R_386_32
278 relocation for the PLT entry. */
280 srelplt2
->size
+= (htab
->sizeof_reloc
* 2);
285 eh
->plt_got
.offset
= (bfd_vma
) -1;
286 h
->plt
.offset
= (bfd_vma
) -1;
292 eh
->plt_got
.offset
= (bfd_vma
) -1;
293 h
->plt
.offset
= (bfd_vma
) -1;
297 eh
->tlsdesc_got
= (bfd_vma
) -1;
299 /* For i386, if R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the
300 binary, make it a R_386_TLS_LE_32 requiring no TLS entry. For
301 x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
302 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
303 if (h
->got
.refcount
> 0
304 && bfd_link_executable (info
)
306 && (elf_x86_hash_entry (h
)->tls_type
& GOT_TLS_IE
))
307 h
->got
.offset
= (bfd_vma
) -1;
308 else if (h
->got
.refcount
> 0)
312 int tls_type
= elf_x86_hash_entry (h
)->tls_type
;
314 /* Make sure this symbol is output as a dynamic symbol.
315 Undefined weak syms won't yet be marked as dynamic. */
319 && h
->root
.type
== bfd_link_hash_undefweak
)
321 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
326 if (GOT_TLS_GDESC_P (tls_type
))
328 eh
->tlsdesc_got
= htab
->elf
.sgotplt
->size
329 - elf_x86_compute_jump_table_size (htab
);
330 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
331 h
->got
.offset
= (bfd_vma
) -2;
333 if (! GOT_TLS_GDESC_P (tls_type
)
334 || GOT_TLS_GD_P (tls_type
))
336 h
->got
.offset
= s
->size
;
337 s
->size
+= htab
->got_entry_size
;
338 /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
340 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
341 s
->size
+= htab
->got_entry_size
;
343 dyn
= htab
->elf
.dynamic_sections_created
;
344 /* R_386_TLS_IE_32 needs one dynamic relocation,
345 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
346 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
347 need two), R_386_TLS_GD and R_X86_64_TLSGD need one if local
348 symbol and two if global. No dynamic relocation against
349 resolved undefined weak symbol in executable. No dynamic
350 relocation against non-preemptible absolute symbol. */
351 if (tls_type
== GOT_TLS_IE_BOTH
)
352 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
353 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
354 || (tls_type
& GOT_TLS_IE
))
355 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
356 else if (GOT_TLS_GD_P (tls_type
))
357 htab
->elf
.srelgot
->size
+= 2 * htab
->sizeof_reloc
;
358 else if (! GOT_TLS_GDESC_P (tls_type
)
359 && ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
360 && !resolved_to_zero
)
361 || h
->root
.type
!= bfd_link_hash_undefweak
)
362 && ((bfd_link_pic (info
)
363 && !(h
->dynindx
== -1
364 && ABS_SYMBOL_P (h
)))
365 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
366 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
367 if (GOT_TLS_GDESC_P (tls_type
))
369 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
370 if (bed
->target_id
== X86_64_ELF_DATA
)
371 htab
->elf
.tlsdesc_plt
= (bfd_vma
) -1;
375 h
->got
.offset
= (bfd_vma
) -1;
377 if (h
->dyn_relocs
== NULL
)
380 /* In the shared -Bsymbolic case, discard space allocated for
381 dynamic pc-relative relocs against symbols which turn out to be
382 defined in regular objects. For the normal shared case, discard
383 space for pc-relative relocs that have become local due to symbol
384 visibility changes. */
386 if (bfd_link_pic (info
))
388 /* Relocs that use pc_count are those that appear on a call
389 insn, or certain REL relocs that can generated via assembly.
390 We want calls to protected symbols to resolve directly to the
391 function rather than going via the plt. If people want
392 function pointer comparisons to work as expected then they
393 should avoid writing weird assembly. */
394 if (SYMBOL_CALLS_LOCAL (info
, h
))
396 struct elf_dyn_relocs
**pp
;
398 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
400 p
->count
-= p
->pc_count
;
409 if (htab
->elf
.target_os
== is_vxworks
)
411 struct elf_dyn_relocs
**pp
;
412 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
414 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
421 /* Also discard relocs on undefined weak syms with non-default
422 visibility or in PIE. */
423 if (h
->dyn_relocs
!= NULL
)
425 if (h
->root
.type
== bfd_link_hash_undefweak
)
427 /* Undefined weak symbol is never bound locally in shared
429 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
432 if (bed
->target_id
== I386_ELF_DATA
435 /* Keep dynamic non-GOT/non-PLT relocation so
436 that we can branch to 0 without PLT. */
437 struct elf_dyn_relocs
**pp
;
439 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
440 if (p
->pc_count
== 0)
444 /* Remove non-R_386_PC32 relocation. */
445 p
->count
= p
->pc_count
;
449 /* Make sure undefined weak symbols are output
450 as dynamic symbols in PIEs for dynamic non-GOT
451 non-PLT reloations. */
452 if (h
->dyn_relocs
!= NULL
453 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
457 h
->dyn_relocs
= NULL
;
459 else if (h
->dynindx
== -1
461 && !bfd_elf_link_record_dynamic_symbol (info
, h
))
464 else if (bfd_link_executable (info
)
465 && (h
->needs_copy
|| eh
->needs_copy
)
469 /* NB: needs_copy is set only for x86-64. For PIE,
470 discard space for pc-relative relocs against symbols
471 which turn out to need copy relocs. */
472 struct elf_dyn_relocs
**pp
;
474 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
476 if (p
->pc_count
!= 0)
484 else if (ELIMINATE_COPY_RELOCS
)
486 /* For the non-shared case, discard space for relocs against
487 symbols which turn out to need copy relocs or are not
488 dynamic. Keep dynamic relocations for run-time function
489 pointer initialization. */
492 || (h
->root
.type
== bfd_link_hash_undefweak
493 && !resolved_to_zero
))
496 || (htab
->elf
.dynamic_sections_created
497 && (h
->root
.type
== bfd_link_hash_undefweak
498 || h
->root
.type
== bfd_link_hash_undefined
))))
500 /* Make sure this symbol is output as a dynamic symbol.
501 Undefined weak syms won't yet be marked as dynamic. */
505 && h
->root
.type
== bfd_link_hash_undefweak
506 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
509 /* If that succeeded, we know we'll be keeping all the
511 if (h
->dynindx
!= -1)
515 h
->dyn_relocs
= NULL
;
520 /* Finally, allocate space. */
521 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
525 sreloc
= elf_section_data (p
->sec
)->sreloc
;
527 BFD_ASSERT (sreloc
!= NULL
);
528 sreloc
->size
+= p
->count
* htab
->sizeof_reloc
;
534 /* Allocate space in .plt, .got and associated reloc sections for
535 local dynamic relocs. */
538 elf_x86_allocate_local_dynreloc (void **slot
, void *inf
)
540 struct elf_link_hash_entry
*h
541 = (struct elf_link_hash_entry
*) *slot
;
543 if (h
->type
!= STT_GNU_IFUNC
547 || h
->root
.type
!= bfd_link_hash_defined
)
550 return elf_x86_allocate_dynrelocs (h
, inf
);
553 /* Find and/or create a hash entry for local symbol. */
555 struct elf_link_hash_entry
*
556 _bfd_elf_x86_get_local_sym_hash (struct elf_x86_link_hash_table
*htab
,
557 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
560 struct elf_x86_link_hash_entry e
, *ret
;
561 asection
*sec
= abfd
->sections
;
562 hashval_t h
= ELF_LOCAL_SYMBOL_HASH (sec
->id
,
563 htab
->r_sym (rel
->r_info
));
566 e
.elf
.indx
= sec
->id
;
567 e
.elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
568 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
569 create
? INSERT
: NO_INSERT
);
576 ret
= (struct elf_x86_link_hash_entry
*) *slot
;
580 ret
= (struct elf_x86_link_hash_entry
*)
581 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
582 sizeof (struct elf_x86_link_hash_entry
));
585 memset (ret
, 0, sizeof (*ret
));
586 ret
->elf
.indx
= sec
->id
;
587 ret
->elf
.dynstr_index
= htab
->r_sym (rel
->r_info
);
588 ret
->elf
.dynindx
= -1;
589 ret
->plt_got
.offset
= (bfd_vma
) -1;
595 /* Create an entry in a x86 ELF linker hash table. NB: THIS MUST BE IN
596 SYNC WITH _bfd_elf_link_hash_newfunc. */
598 struct bfd_hash_entry
*
599 _bfd_x86_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
600 struct bfd_hash_table
*table
,
603 /* Allocate the structure if it has not already been allocated by a
607 entry
= (struct bfd_hash_entry
*)
608 bfd_hash_allocate (table
,
609 sizeof (struct elf_x86_link_hash_entry
));
614 /* Call the allocation method of the superclass. */
615 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
618 struct elf_x86_link_hash_entry
*eh
619 = (struct elf_x86_link_hash_entry
*) entry
;
620 struct elf_link_hash_table
*htab
621 = (struct elf_link_hash_table
*) table
;
623 memset (&eh
->elf
.size
, 0,
624 (sizeof (struct elf_x86_link_hash_entry
)
625 - offsetof (struct elf_link_hash_entry
, size
)));
626 /* Set local fields. */
628 eh
->elf
.dynindx
= -1;
629 eh
->elf
.got
= htab
->init_got_refcount
;
630 eh
->elf
.plt
= htab
->init_plt_refcount
;
631 /* Assume that we have been called by a non-ELF symbol reader.
632 This flag is then reset by the code which reads an ELF input
633 file. This ensures that a symbol created by a non-ELF symbol
634 reader will have the flag set correctly. */
636 eh
->plt_second
.offset
= (bfd_vma
) -1;
637 eh
->plt_got
.offset
= (bfd_vma
) -1;
638 eh
->tlsdesc_got
= (bfd_vma
) -1;
639 eh
->zero_undefweak
= 1;
645 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
646 for local symbol so that we can handle local STT_GNU_IFUNC symbols
647 as global symbol. We reuse indx and dynstr_index for local symbol
648 hash since they aren't used by global symbols in this backend. */
651 _bfd_x86_elf_local_htab_hash (const void *ptr
)
653 struct elf_link_hash_entry
*h
654 = (struct elf_link_hash_entry
*) ptr
;
655 return ELF_LOCAL_SYMBOL_HASH (h
->indx
, h
->dynstr_index
);
658 /* Compare local hash entries. */
661 _bfd_x86_elf_local_htab_eq (const void *ptr1
, const void *ptr2
)
663 struct elf_link_hash_entry
*h1
664 = (struct elf_link_hash_entry
*) ptr1
;
665 struct elf_link_hash_entry
*h2
666 = (struct elf_link_hash_entry
*) ptr2
;
668 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
671 /* Destroy an x86 ELF linker hash table. */
674 elf_x86_link_hash_table_free (bfd
*obfd
)
676 struct elf_x86_link_hash_table
*htab
677 = (struct elf_x86_link_hash_table
*) obfd
->link
.hash
;
679 if (htab
->loc_hash_table
)
680 htab_delete (htab
->loc_hash_table
);
681 if (htab
->loc_hash_memory
)
682 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
683 _bfd_elf_link_hash_table_free (obfd
);
687 elf_i386_is_reloc_section (const char *secname
)
689 return CONST_STRNEQ (secname
, ".rel");
693 elf_x86_64_is_reloc_section (const char *secname
)
695 return CONST_STRNEQ (secname
, ".rela");
698 /* Create an x86 ELF linker hash table. */
700 struct bfd_link_hash_table
*
701 _bfd_x86_elf_link_hash_table_create (bfd
*abfd
)
703 struct elf_x86_link_hash_table
*ret
;
704 const struct elf_backend_data
*bed
;
705 size_t amt
= sizeof (struct elf_x86_link_hash_table
);
707 ret
= (struct elf_x86_link_hash_table
*) bfd_zmalloc (amt
);
711 bed
= get_elf_backend_data (abfd
);
712 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
713 _bfd_x86_elf_link_hash_newfunc
,
714 sizeof (struct elf_x86_link_hash_entry
),
721 if (bed
->target_id
== X86_64_ELF_DATA
)
723 ret
->is_reloc_section
= elf_x86_64_is_reloc_section
;
724 ret
->got_entry_size
= 8;
725 ret
->pcrel_plt
= TRUE
;
726 ret
->tls_get_addr
= "__tls_get_addr";
730 ret
->sizeof_reloc
= sizeof (Elf64_External_Rela
);
731 ret
->pointer_r_type
= R_X86_64_64
;
732 ret
->dynamic_interpreter
= ELF64_DYNAMIC_INTERPRETER
;
733 ret
->dynamic_interpreter_size
= sizeof ELF64_DYNAMIC_INTERPRETER
;
737 if (bed
->target_id
== X86_64_ELF_DATA
)
739 ret
->sizeof_reloc
= sizeof (Elf32_External_Rela
);
740 ret
->pointer_r_type
= R_X86_64_32
;
741 ret
->dynamic_interpreter
= ELFX32_DYNAMIC_INTERPRETER
;
742 ret
->dynamic_interpreter_size
743 = sizeof ELFX32_DYNAMIC_INTERPRETER
;
747 ret
->is_reloc_section
= elf_i386_is_reloc_section
;
748 ret
->sizeof_reloc
= sizeof (Elf32_External_Rel
);
749 ret
->got_entry_size
= 4;
750 ret
->pcrel_plt
= FALSE
;
751 ret
->pointer_r_type
= R_386_32
;
752 ret
->dynamic_interpreter
= ELF32_DYNAMIC_INTERPRETER
;
753 ret
->dynamic_interpreter_size
754 = sizeof ELF32_DYNAMIC_INTERPRETER
;
755 ret
->tls_get_addr
= "___tls_get_addr";
759 ret
->loc_hash_table
= htab_try_create (1024,
760 _bfd_x86_elf_local_htab_hash
,
761 _bfd_x86_elf_local_htab_eq
,
763 ret
->loc_hash_memory
= objalloc_create ();
764 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
766 elf_x86_link_hash_table_free (abfd
);
769 ret
->elf
.root
.hash_table_free
= elf_x86_link_hash_table_free
;
771 return &ret
->elf
.root
;
774 /* Sort relocs into address order. */
777 _bfd_x86_elf_compare_relocs (const void *ap
, const void *bp
)
779 const arelent
*a
= * (const arelent
**) ap
;
780 const arelent
*b
= * (const arelent
**) bp
;
782 if (a
->address
> b
->address
)
784 else if (a
->address
< b
->address
)
790 /* Mark symbol, NAME, as locally defined by linker if it is referenced
791 and not defined in a relocatable object file. */
794 elf_x86_linker_defined (struct bfd_link_info
*info
, const char *name
)
796 struct elf_link_hash_entry
*h
;
798 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
799 FALSE
, FALSE
, FALSE
);
803 while (h
->root
.type
== bfd_link_hash_indirect
)
804 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
806 if (h
->root
.type
== bfd_link_hash_new
807 || h
->root
.type
== bfd_link_hash_undefined
808 || h
->root
.type
== bfd_link_hash_undefweak
809 || h
->root
.type
== bfd_link_hash_common
810 || (!h
->def_regular
&& h
->def_dynamic
))
812 elf_x86_hash_entry (h
)->local_ref
= 2;
813 elf_x86_hash_entry (h
)->linker_def
= 1;
817 /* Hide a linker-defined symbol, NAME, with hidden visibility. */
820 elf_x86_hide_linker_defined (struct bfd_link_info
*info
,
823 struct elf_link_hash_entry
*h
;
825 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
826 FALSE
, FALSE
, FALSE
);
830 while (h
->root
.type
== bfd_link_hash_indirect
)
831 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
833 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
834 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
835 _bfd_elf_link_hash_hide_symbol (info
, h
, TRUE
);
839 _bfd_x86_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
841 if (!bfd_link_relocatable (info
))
843 /* Check for __tls_get_addr reference. */
844 struct elf_x86_link_hash_table
*htab
;
845 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
846 htab
= elf_x86_hash_table (info
, bed
->target_id
);
849 struct elf_link_hash_entry
*h
;
851 h
= elf_link_hash_lookup (elf_hash_table (info
),
853 FALSE
, FALSE
, FALSE
);
856 elf_x86_hash_entry (h
)->tls_get_addr
= 1;
858 /* Check the versioned __tls_get_addr symbol. */
859 while (h
->root
.type
== bfd_link_hash_indirect
)
861 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
862 elf_x86_hash_entry (h
)->tls_get_addr
= 1;
866 /* "__ehdr_start" will be defined by linker as a hidden symbol
867 later if it is referenced and not defined. */
868 elf_x86_linker_defined (info
, "__ehdr_start");
870 if (bfd_link_executable (info
))
872 /* References to __bss_start, _end and _edata should be
873 locally resolved within executables. */
874 elf_x86_linker_defined (info
, "__bss_start");
875 elf_x86_linker_defined (info
, "_end");
876 elf_x86_linker_defined (info
, "_edata");
880 /* Hide hidden __bss_start, _end and _edata in shared
882 elf_x86_hide_linker_defined (info
, "__bss_start");
883 elf_x86_hide_linker_defined (info
, "_end");
884 elf_x86_hide_linker_defined (info
, "_edata");
889 /* Invoke the regular ELF backend linker to do all the work. */
890 return _bfd_elf_link_check_relocs (abfd
, info
);
894 _bfd_elf_x86_valid_reloc_p (asection
*input_section
,
895 struct bfd_link_info
*info
,
896 struct elf_x86_link_hash_table
*htab
,
897 const Elf_Internal_Rela
*rel
,
898 struct elf_link_hash_entry
*h
,
899 Elf_Internal_Sym
*sym
,
900 Elf_Internal_Shdr
*symtab_hdr
,
901 bfd_boolean
*no_dynreloc_p
)
903 bfd_boolean valid_p
= TRUE
;
905 *no_dynreloc_p
= FALSE
;
907 /* Check If relocation against non-preemptible absolute symbol is
908 valid in PIC. FIXME: Can't use SYMBOL_REFERENCES_LOCAL_P since
909 it may call _bfd_elf_link_hide_sym_by_version and result in
910 ld-elfvers/ vers21 test failure. */
911 if (bfd_link_pic (info
)
912 && (h
== NULL
|| SYMBOL_REFERENCES_LOCAL (info
, h
)))
914 const struct elf_backend_data
*bed
;
916 Elf_Internal_Rela irel
;
918 /* Skip non-absolute symbol. */
921 if (!ABS_SYMBOL_P (h
))
924 else if (sym
->st_shndx
!= SHN_ABS
)
927 bed
= get_elf_backend_data (input_section
->owner
);
928 r_type
= ELF32_R_TYPE (rel
->r_info
);
931 /* Only allow relocations against absolute symbol, which can be
932 resolved as absolute value + addend. GOTPCREL relocations
933 are allowed since absolute value + addend is stored in the
935 if (bed
->target_id
== X86_64_ELF_DATA
)
937 r_type
&= ~R_X86_64_converted_reloc_bit
;
938 valid_p
= (r_type
== R_X86_64_64
939 || r_type
== R_X86_64_32
940 || r_type
== R_X86_64_32S
941 || r_type
== R_X86_64_16
942 || r_type
== R_X86_64_8
943 || r_type
== R_X86_64_GOTPCREL
944 || r_type
== R_X86_64_GOTPCRELX
945 || r_type
== R_X86_64_REX_GOTPCRELX
);
948 unsigned int r_symndx
= htab
->r_sym (rel
->r_info
);
949 irel
.r_info
= htab
->r_info (r_symndx
, r_type
);
953 valid_p
= (r_type
== R_386_32
954 || r_type
== R_386_16
955 || r_type
== R_386_8
);
958 *no_dynreloc_p
= TRUE
;
962 arelent internal_reloc
;
964 if (!bed
->elf_info_to_howto (input_section
->owner
,
965 &internal_reloc
, &irel
)
966 || internal_reloc
.howto
== NULL
)
970 name
= h
->root
.root
.string
;
972 name
= bfd_elf_sym_name (input_section
->owner
, symtab_hdr
,
974 info
->callbacks
->einfo
975 /* xgettext:c-format */
976 (_("%F%P: %pB: relocation %s against absolute symbol "
977 "`%s' in section `%pA' is disallowed\n"),
978 input_section
->owner
, internal_reloc
.howto
->name
, name
,
980 bfd_set_error (bfd_error_bad_value
);
987 /* Set the sizes of the dynamic sections. */
990 _bfd_x86_elf_size_dynamic_sections (bfd
*output_bfd
,
991 struct bfd_link_info
*info
)
993 struct elf_x86_link_hash_table
*htab
;
998 const struct elf_backend_data
*bed
999 = get_elf_backend_data (output_bfd
);
1001 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1004 dynobj
= htab
->elf
.dynobj
;
1008 /* Set up .got offsets for local syms, and space for local dynamic
1010 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
1012 bfd_signed_vma
*local_got
;
1013 bfd_signed_vma
*end_local_got
;
1014 char *local_tls_type
;
1015 bfd_vma
*local_tlsdesc_gotent
;
1016 bfd_size_type locsymcount
;
1017 Elf_Internal_Shdr
*symtab_hdr
;
1020 if (! is_x86_elf (ibfd
, htab
))
1023 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1025 struct elf_dyn_relocs
*p
;
1027 for (p
= ((struct elf_dyn_relocs
*)
1028 elf_section_data (s
)->local_dynrel
);
1032 if (!bfd_is_abs_section (p
->sec
)
1033 && bfd_is_abs_section (p
->sec
->output_section
))
1035 /* Input section has been discarded, either because
1036 it is a copy of a linkonce section or due to
1037 linker script /DISCARD/, so we'll be discarding
1040 else if (htab
->elf
.target_os
== is_vxworks
1041 && strcmp (p
->sec
->output_section
->name
,
1044 /* Relocations in vxworks .tls_vars sections are
1045 handled specially by the loader. */
1047 else if (p
->count
!= 0)
1049 srel
= elf_section_data (p
->sec
)->sreloc
;
1050 srel
->size
+= p
->count
* htab
->sizeof_reloc
;
1051 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0
1052 && (info
->flags
& DF_TEXTREL
) == 0)
1054 info
->flags
|= DF_TEXTREL
;
1055 if (bfd_link_textrel_check (info
))
1056 /* xgettext:c-format */
1057 info
->callbacks
->einfo
1058 (_("%P: %pB: warning: relocation "
1059 "in read-only section `%pA'\n"),
1060 p
->sec
->owner
, p
->sec
);
1066 local_got
= elf_local_got_refcounts (ibfd
);
1070 symtab_hdr
= &elf_symtab_hdr (ibfd
);
1071 locsymcount
= symtab_hdr
->sh_info
;
1072 end_local_got
= local_got
+ locsymcount
;
1073 local_tls_type
= elf_x86_local_got_tls_type (ibfd
);
1074 local_tlsdesc_gotent
= elf_x86_local_tlsdesc_gotent (ibfd
);
1076 srel
= htab
->elf
.srelgot
;
1077 for (; local_got
< end_local_got
;
1078 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
1080 *local_tlsdesc_gotent
= (bfd_vma
) -1;
1083 if (GOT_TLS_GDESC_P (*local_tls_type
))
1085 *local_tlsdesc_gotent
= htab
->elf
.sgotplt
->size
1086 - elf_x86_compute_jump_table_size (htab
);
1087 htab
->elf
.sgotplt
->size
+= 2 * htab
->got_entry_size
;
1088 *local_got
= (bfd_vma
) -2;
1090 if (! GOT_TLS_GDESC_P (*local_tls_type
)
1091 || GOT_TLS_GD_P (*local_tls_type
))
1093 *local_got
= s
->size
;
1094 s
->size
+= htab
->got_entry_size
;
1095 if (GOT_TLS_GD_P (*local_tls_type
)
1096 || *local_tls_type
== GOT_TLS_IE_BOTH
)
1097 s
->size
+= htab
->got_entry_size
;
1099 if ((bfd_link_pic (info
) && *local_tls_type
!= GOT_ABS
)
1100 || GOT_TLS_GD_ANY_P (*local_tls_type
)
1101 || (*local_tls_type
& GOT_TLS_IE
))
1103 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
1104 srel
->size
+= 2 * htab
->sizeof_reloc
;
1105 else if (GOT_TLS_GD_P (*local_tls_type
)
1106 || ! GOT_TLS_GDESC_P (*local_tls_type
))
1107 srel
->size
+= htab
->sizeof_reloc
;
1108 if (GOT_TLS_GDESC_P (*local_tls_type
))
1110 htab
->elf
.srelplt
->size
+= htab
->sizeof_reloc
;
1111 if (bed
->target_id
== X86_64_ELF_DATA
)
1112 htab
->elf
.tlsdesc_plt
= (bfd_vma
) -1;
1117 *local_got
= (bfd_vma
) -1;
1121 if (htab
->tls_ld_or_ldm_got
.refcount
> 0)
1123 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1124 or R_X86_64_TLSLD relocs. */
1125 htab
->tls_ld_or_ldm_got
.offset
= htab
->elf
.sgot
->size
;
1126 htab
->elf
.sgot
->size
+= 2 * htab
->got_entry_size
;
1127 htab
->elf
.srelgot
->size
+= htab
->sizeof_reloc
;
1130 htab
->tls_ld_or_ldm_got
.offset
= -1;
1132 /* Allocate global sym .plt and .got entries, and space for global
1133 sym dynamic relocs. */
1134 elf_link_hash_traverse (&htab
->elf
, elf_x86_allocate_dynrelocs
,
1137 /* Allocate .plt and .got entries, and space for local symbols. */
1138 htab_traverse (htab
->loc_hash_table
, elf_x86_allocate_local_dynreloc
,
1141 /* For every jump slot reserved in the sgotplt, reloc_count is
1142 incremented. However, when we reserve space for TLS descriptors,
1143 it's not incremented, so in order to compute the space reserved
1144 for them, it suffices to multiply the reloc count by the jump
1147 PR ld/13302: We start next_irelative_index at the end of .rela.plt
1148 so that R_{386,X86_64}_IRELATIVE entries come last. */
1149 if (htab
->elf
.srelplt
)
1151 htab
->next_tls_desc_index
= htab
->elf
.srelplt
->reloc_count
;
1152 htab
->sgotplt_jump_table_size
1153 = elf_x86_compute_jump_table_size (htab
);
1154 htab
->next_irelative_index
= htab
->elf
.srelplt
->reloc_count
- 1;
1156 else if (htab
->elf
.irelplt
)
1157 htab
->next_irelative_index
= htab
->elf
.irelplt
->reloc_count
- 1;
1159 if (htab
->elf
.tlsdesc_plt
)
1161 /* NB: tlsdesc_plt is set only for x86-64. If we're not using
1162 lazy TLS relocations, don't generate the PLT and GOT entries
1164 if ((info
->flags
& DF_BIND_NOW
))
1165 htab
->elf
.tlsdesc_plt
= 0;
1168 htab
->elf
.tlsdesc_got
= htab
->elf
.sgot
->size
;
1169 htab
->elf
.sgot
->size
+= htab
->got_entry_size
;
1170 /* Reserve room for the initial entry.
1171 FIXME: we could probably do away with it in this case. */
1172 if (htab
->elf
.splt
->size
== 0)
1173 htab
->elf
.splt
->size
= htab
->plt
.plt_entry_size
;
1174 htab
->elf
.tlsdesc_plt
= htab
->elf
.splt
->size
;
1175 htab
->elf
.splt
->size
+= htab
->plt
.plt_entry_size
;
1179 if (htab
->elf
.sgotplt
)
1181 /* Don't allocate .got.plt section if there are no GOT nor PLT
1182 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
1183 if ((htab
->elf
.hgot
== NULL
1184 || !htab
->got_referenced
)
1185 && (htab
->elf
.sgotplt
->size
== bed
->got_header_size
)
1186 && (htab
->elf
.splt
== NULL
1187 || htab
->elf
.splt
->size
== 0)
1188 && (htab
->elf
.sgot
== NULL
1189 || htab
->elf
.sgot
->size
== 0)
1190 && (htab
->elf
.iplt
== NULL
1191 || htab
->elf
.iplt
->size
== 0)
1192 && (htab
->elf
.igotplt
== NULL
1193 || htab
->elf
.igotplt
->size
== 0))
1195 htab
->elf
.sgotplt
->size
= 0;
1196 /* Solaris requires to keep _GLOBAL_OFFSET_TABLE_ even if it
1198 if (htab
->elf
.hgot
!= NULL
1199 && htab
->elf
.target_os
!= is_solaris
)
1201 /* Remove the unused _GLOBAL_OFFSET_TABLE_ from symbol
1203 htab
->elf
.hgot
->root
.type
= bfd_link_hash_undefined
;
1204 htab
->elf
.hgot
->root
.u
.undef
.abfd
1205 = htab
->elf
.hgot
->root
.u
.def
.section
->owner
;
1206 htab
->elf
.hgot
->root
.linker_def
= 0;
1207 htab
->elf
.hgot
->ref_regular
= 0;
1208 htab
->elf
.hgot
->def_regular
= 0;
1213 if (_bfd_elf_eh_frame_present (info
))
1215 if (htab
->plt_eh_frame
!= NULL
1216 && htab
->elf
.splt
!= NULL
1217 && htab
->elf
.splt
->size
!= 0
1218 && !bfd_is_abs_section (htab
->elf
.splt
->output_section
))
1219 htab
->plt_eh_frame
->size
= htab
->plt
.eh_frame_plt_size
;
1221 if (htab
->plt_got_eh_frame
!= NULL
1222 && htab
->plt_got
!= NULL
1223 && htab
->plt_got
->size
!= 0
1224 && !bfd_is_abs_section (htab
->plt_got
->output_section
))
1225 htab
->plt_got_eh_frame
->size
1226 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1228 /* Unwind info for the second PLT and .plt.got sections are
1230 if (htab
->plt_second_eh_frame
!= NULL
1231 && htab
->plt_second
!= NULL
1232 && htab
->plt_second
->size
!= 0
1233 && !bfd_is_abs_section (htab
->plt_second
->output_section
))
1234 htab
->plt_second_eh_frame
->size
1235 = htab
->non_lazy_plt
->eh_frame_plt_size
;
1238 /* We now have determined the sizes of the various dynamic sections.
1239 Allocate memory for them. */
1241 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1243 bfd_boolean strip_section
= TRUE
;
1245 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1248 if (s
== htab
->elf
.splt
1249 || s
== htab
->elf
.sgot
)
1251 /* Strip this section if we don't need it; see the
1253 /* We'd like to strip these sections if they aren't needed, but if
1254 we've exported dynamic symbols from them we must leave them.
1255 It's too late to tell BFD to get rid of the symbols. */
1257 if (htab
->elf
.hplt
!= NULL
)
1258 strip_section
= FALSE
;
1260 else if (s
== htab
->elf
.sgotplt
1261 || s
== htab
->elf
.iplt
1262 || s
== htab
->elf
.igotplt
1263 || s
== htab
->plt_second
1264 || s
== htab
->plt_got
1265 || s
== htab
->plt_eh_frame
1266 || s
== htab
->plt_got_eh_frame
1267 || s
== htab
->plt_second_eh_frame
1268 || s
== htab
->elf
.sdynbss
1269 || s
== htab
->elf
.sdynrelro
)
1271 /* Strip these too. */
1273 else if (htab
->is_reloc_section (bfd_section_name (s
)))
1276 && s
!= htab
->elf
.srelplt
1277 && s
!= htab
->srelplt2
)
1280 /* We use the reloc_count field as a counter if we need
1281 to copy relocs into the output file. */
1282 if (s
!= htab
->elf
.srelplt
)
1287 /* It's not one of our sections, so don't allocate space. */
1293 /* If we don't need this section, strip it from the
1294 output file. This is mostly to handle .rel.bss and
1295 .rel.plt. We must create both sections in
1296 create_dynamic_sections, because they must be created
1297 before the linker maps input sections to output
1298 sections. The linker does that before
1299 adjust_dynamic_symbol is called, and it is that
1300 function which decides whether anything needs to go
1301 into these sections. */
1303 s
->flags
|= SEC_EXCLUDE
;
1307 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
1310 /* NB: Initially, the iplt section has minimal alignment to
1311 avoid moving dot of the following section backwards when
1312 it is empty. Update its section alignment now since it
1314 if (s
== htab
->elf
.iplt
)
1315 bfd_set_section_alignment (s
, htab
->plt
.iplt_alignment
);
1317 /* Allocate memory for the section contents. We use bfd_zalloc
1318 here in case unused entries are not reclaimed before the
1319 section's contents are written out. This should not happen,
1320 but this way if it does, we get a R_386_NONE or R_X86_64_NONE
1321 reloc instead of garbage. */
1322 s
->contents
= (unsigned char *) bfd_zalloc (dynobj
, s
->size
);
1323 if (s
->contents
== NULL
)
1327 if (htab
->plt_eh_frame
!= NULL
1328 && htab
->plt_eh_frame
->contents
!= NULL
)
1330 memcpy (htab
->plt_eh_frame
->contents
,
1331 htab
->plt
.eh_frame_plt
,
1332 htab
->plt_eh_frame
->size
);
1333 bfd_put_32 (dynobj
, htab
->elf
.splt
->size
,
1334 htab
->plt_eh_frame
->contents
+ PLT_FDE_LEN_OFFSET
);
1337 if (htab
->plt_got_eh_frame
!= NULL
1338 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1340 memcpy (htab
->plt_got_eh_frame
->contents
,
1341 htab
->non_lazy_plt
->eh_frame_plt
,
1342 htab
->plt_got_eh_frame
->size
);
1343 bfd_put_32 (dynobj
, htab
->plt_got
->size
,
1344 (htab
->plt_got_eh_frame
->contents
1345 + PLT_FDE_LEN_OFFSET
));
1348 if (htab
->plt_second_eh_frame
!= NULL
1349 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1351 memcpy (htab
->plt_second_eh_frame
->contents
,
1352 htab
->non_lazy_plt
->eh_frame_plt
,
1353 htab
->plt_second_eh_frame
->size
);
1354 bfd_put_32 (dynobj
, htab
->plt_second
->size
,
1355 (htab
->plt_second_eh_frame
->contents
1356 + PLT_FDE_LEN_OFFSET
));
1359 return _bfd_elf_maybe_vxworks_add_dynamic_tags (output_bfd
, info
,
1363 /* Finish up the x86 dynamic sections. */
1365 struct elf_x86_link_hash_table
*
1366 _bfd_x86_elf_finish_dynamic_sections (bfd
*output_bfd
,
1367 struct bfd_link_info
*info
)
1369 struct elf_x86_link_hash_table
*htab
;
1370 const struct elf_backend_data
*bed
;
1373 bfd_byte
*dyncon
, *dynconend
;
1374 bfd_size_type sizeof_dyn
;
1376 bed
= get_elf_backend_data (output_bfd
);
1377 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1381 dynobj
= htab
->elf
.dynobj
;
1382 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
1384 /* GOT is always created in setup_gnu_properties. But it may not be
1385 needed. .got.plt section may be needed for static IFUNC. */
1386 if (htab
->elf
.sgotplt
&& htab
->elf
.sgotplt
->size
> 0)
1388 bfd_vma dynamic_addr
;
1390 if (bfd_is_abs_section (htab
->elf
.sgotplt
->output_section
))
1393 (_("discarded output section: `%pA'"), htab
->elf
.sgotplt
);
1397 elf_section_data (htab
->elf
.sgotplt
->output_section
)->this_hdr
.sh_entsize
1398 = htab
->got_entry_size
;
1400 dynamic_addr
= (sdyn
== NULL
1402 : sdyn
->output_section
->vma
+ sdyn
->output_offset
);
1404 /* Set the first entry in the global offset table to the address
1405 of the dynamic section. Write GOT[1] and GOT[2], needed for
1406 the dynamic linker. */
1407 if (htab
->got_entry_size
== 8)
1409 bfd_put_64 (output_bfd
, dynamic_addr
,
1410 htab
->elf
.sgotplt
->contents
);
1411 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
1412 htab
->elf
.sgotplt
->contents
+ 8);
1413 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
1414 htab
->elf
.sgotplt
->contents
+ 8*2);
1418 bfd_put_32 (output_bfd
, dynamic_addr
,
1419 htab
->elf
.sgotplt
->contents
);
1420 bfd_put_32 (output_bfd
, 0,
1421 htab
->elf
.sgotplt
->contents
+ 4);
1422 bfd_put_32 (output_bfd
, 0,
1423 htab
->elf
.sgotplt
->contents
+ 4*2);
1427 if (!htab
->elf
.dynamic_sections_created
)
1430 if (sdyn
== NULL
|| htab
->elf
.sgot
== NULL
)
1433 sizeof_dyn
= bed
->s
->sizeof_dyn
;
1434 dyncon
= sdyn
->contents
;
1435 dynconend
= sdyn
->contents
+ sdyn
->size
;
1436 for (; dyncon
< dynconend
; dyncon
+= sizeof_dyn
)
1438 Elf_Internal_Dyn dyn
;
1441 (*bed
->s
->swap_dyn_in
) (dynobj
, dyncon
, &dyn
);
1446 if (htab
->elf
.target_os
== is_vxworks
1447 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
1452 s
= htab
->elf
.sgotplt
;
1453 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
1457 dyn
.d_un
.d_ptr
= htab
->elf
.srelplt
->output_section
->vma
;
1461 s
= htab
->elf
.srelplt
->output_section
;
1462 dyn
.d_un
.d_val
= s
->size
;
1465 case DT_TLSDESC_PLT
:
1467 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
1468 + htab
->elf
.tlsdesc_plt
;
1471 case DT_TLSDESC_GOT
:
1473 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
1474 + htab
->elf
.tlsdesc_got
;
1478 (*bed
->s
->swap_dyn_out
) (output_bfd
, &dyn
, dyncon
);
1481 if (htab
->plt_got
!= NULL
&& htab
->plt_got
->size
> 0)
1482 elf_section_data (htab
->plt_got
->output_section
)
1483 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
1485 if (htab
->plt_second
!= NULL
&& htab
->plt_second
->size
> 0)
1486 elf_section_data (htab
->plt_second
->output_section
)
1487 ->this_hdr
.sh_entsize
= htab
->non_lazy_plt
->plt_entry_size
;
1489 /* Adjust .eh_frame for .plt section. */
1490 if (htab
->plt_eh_frame
!= NULL
1491 && htab
->plt_eh_frame
->contents
!= NULL
)
1493 if (htab
->elf
.splt
!= NULL
1494 && htab
->elf
.splt
->size
!= 0
1495 && (htab
->elf
.splt
->flags
& SEC_EXCLUDE
) == 0
1496 && htab
->elf
.splt
->output_section
!= NULL
1497 && htab
->plt_eh_frame
->output_section
!= NULL
)
1499 bfd_vma plt_start
= htab
->elf
.splt
->output_section
->vma
;
1500 bfd_vma eh_frame_start
= htab
->plt_eh_frame
->output_section
->vma
1501 + htab
->plt_eh_frame
->output_offset
1502 + PLT_FDE_START_OFFSET
;
1503 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1504 htab
->plt_eh_frame
->contents
1505 + PLT_FDE_START_OFFSET
);
1508 if (htab
->plt_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
1510 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1512 htab
->plt_eh_frame
->contents
))
1517 /* Adjust .eh_frame for .plt.got section. */
1518 if (htab
->plt_got_eh_frame
!= NULL
1519 && htab
->plt_got_eh_frame
->contents
!= NULL
)
1521 if (htab
->plt_got
!= NULL
1522 && htab
->plt_got
->size
!= 0
1523 && (htab
->plt_got
->flags
& SEC_EXCLUDE
) == 0
1524 && htab
->plt_got
->output_section
!= NULL
1525 && htab
->plt_got_eh_frame
->output_section
!= NULL
)
1527 bfd_vma plt_start
= htab
->plt_got
->output_section
->vma
;
1528 bfd_vma eh_frame_start
= htab
->plt_got_eh_frame
->output_section
->vma
1529 + htab
->plt_got_eh_frame
->output_offset
1530 + PLT_FDE_START_OFFSET
;
1531 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1532 htab
->plt_got_eh_frame
->contents
1533 + PLT_FDE_START_OFFSET
);
1535 if (htab
->plt_got_eh_frame
->sec_info_type
== SEC_INFO_TYPE_EH_FRAME
)
1537 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1538 htab
->plt_got_eh_frame
,
1539 htab
->plt_got_eh_frame
->contents
))
1544 /* Adjust .eh_frame for the second PLT section. */
1545 if (htab
->plt_second_eh_frame
!= NULL
1546 && htab
->plt_second_eh_frame
->contents
!= NULL
)
1548 if (htab
->plt_second
!= NULL
1549 && htab
->plt_second
->size
!= 0
1550 && (htab
->plt_second
->flags
& SEC_EXCLUDE
) == 0
1551 && htab
->plt_second
->output_section
!= NULL
1552 && htab
->plt_second_eh_frame
->output_section
!= NULL
)
1554 bfd_vma plt_start
= htab
->plt_second
->output_section
->vma
;
1555 bfd_vma eh_frame_start
1556 = (htab
->plt_second_eh_frame
->output_section
->vma
1557 + htab
->plt_second_eh_frame
->output_offset
1558 + PLT_FDE_START_OFFSET
);
1559 bfd_put_signed_32 (dynobj
, plt_start
- eh_frame_start
,
1560 htab
->plt_second_eh_frame
->contents
1561 + PLT_FDE_START_OFFSET
);
1563 if (htab
->plt_second_eh_frame
->sec_info_type
1564 == SEC_INFO_TYPE_EH_FRAME
)
1566 if (! _bfd_elf_write_section_eh_frame (output_bfd
, info
,
1567 htab
->plt_second_eh_frame
,
1568 htab
->plt_second_eh_frame
->contents
))
1573 if (htab
->elf
.sgot
&& htab
->elf
.sgot
->size
> 0)
1574 elf_section_data (htab
->elf
.sgot
->output_section
)->this_hdr
.sh_entsize
1575 = htab
->got_entry_size
;
1582 _bfd_x86_elf_always_size_sections (bfd
*output_bfd
,
1583 struct bfd_link_info
*info
)
1585 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
1589 struct elf_link_hash_entry
*tlsbase
;
1591 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
1592 "_TLS_MODULE_BASE_",
1593 FALSE
, FALSE
, FALSE
);
1595 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
1597 struct elf_x86_link_hash_table
*htab
;
1598 struct bfd_link_hash_entry
*bh
= NULL
;
1599 const struct elf_backend_data
*bed
1600 = get_elf_backend_data (output_bfd
);
1602 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1606 if (!(_bfd_generic_link_add_one_symbol
1607 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
1608 tls_sec
, 0, NULL
, FALSE
,
1609 bed
->collect
, &bh
)))
1612 htab
->tls_module_base
= bh
;
1614 tlsbase
= (struct elf_link_hash_entry
*)bh
;
1615 tlsbase
->def_regular
= 1;
1616 tlsbase
->other
= STV_HIDDEN
;
1617 tlsbase
->root
.linker_def
= 1;
1618 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
1626 _bfd_x86_elf_merge_symbol_attribute (struct elf_link_hash_entry
*h
,
1627 unsigned int st_other
,
1628 bfd_boolean definition
,
1629 bfd_boolean dynamic ATTRIBUTE_UNUSED
)
1633 struct elf_x86_link_hash_entry
*eh
1634 = (struct elf_x86_link_hash_entry
*) h
;
1635 eh
->def_protected
= ELF_ST_VISIBILITY (st_other
) == STV_PROTECTED
;
1639 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1642 _bfd_x86_elf_copy_indirect_symbol (struct bfd_link_info
*info
,
1643 struct elf_link_hash_entry
*dir
,
1644 struct elf_link_hash_entry
*ind
)
1646 struct elf_x86_link_hash_entry
*edir
, *eind
;
1648 edir
= (struct elf_x86_link_hash_entry
*) dir
;
1649 eind
= (struct elf_x86_link_hash_entry
*) ind
;
1651 if (ind
->root
.type
== bfd_link_hash_indirect
1652 && dir
->got
.refcount
<= 0)
1654 edir
->tls_type
= eind
->tls_type
;
1655 eind
->tls_type
= GOT_UNKNOWN
;
1658 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1659 generate a R_386_COPY reloc. */
1660 edir
->gotoff_ref
|= eind
->gotoff_ref
;
1662 edir
->zero_undefweak
|= eind
->zero_undefweak
;
1664 if (ELIMINATE_COPY_RELOCS
1665 && ind
->root
.type
!= bfd_link_hash_indirect
1666 && dir
->dynamic_adjusted
)
1668 /* If called to transfer flags for a weakdef during processing
1669 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1670 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1671 if (dir
->versioned
!= versioned_hidden
)
1672 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1673 dir
->ref_regular
|= ind
->ref_regular
;
1674 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1675 dir
->needs_plt
|= ind
->needs_plt
;
1676 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1679 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1682 /* Remove undefined weak symbol from the dynamic symbol table if it
1683 is resolved to 0. */
1686 _bfd_x86_elf_fixup_symbol (struct bfd_link_info
*info
,
1687 struct elf_link_hash_entry
*h
)
1689 if (h
->dynindx
!= -1
1690 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, elf_x86_hash_entry (h
)))
1693 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
1699 /* Change the STT_GNU_IFUNC symbol defined in position-dependent
1700 executable into the normal function symbol and set its address
1701 to its PLT entry, which should be resolved by R_*_IRELATIVE at
1705 _bfd_x86_elf_link_fixup_ifunc_symbol (struct bfd_link_info
*info
,
1706 struct elf_x86_link_hash_table
*htab
,
1707 struct elf_link_hash_entry
*h
,
1708 Elf_Internal_Sym
*sym
)
1710 if (bfd_link_pde (info
)
1713 && h
->plt
.offset
!= (bfd_vma
) -1
1714 && h
->type
== STT_GNU_IFUNC
1715 && h
->pointer_equality_needed
)
1719 bfd
*output_bfd
= info
->output_bfd
;
1721 if (htab
->plt_second
)
1723 struct elf_x86_link_hash_entry
*eh
1724 = (struct elf_x86_link_hash_entry
*) h
;
1726 plt_s
= htab
->plt_second
;
1727 plt_offset
= eh
->plt_second
.offset
;
1731 plt_s
= htab
->elf
.splt
;
1732 plt_offset
= h
->plt
.offset
;
1736 sym
->st_info
= ELF_ST_INFO (ELF_ST_BIND (sym
->st_info
), STT_FUNC
);
1738 = _bfd_elf_section_from_bfd_section (output_bfd
,
1739 plt_s
->output_section
);
1740 sym
->st_value
= (plt_s
->output_section
->vma
1741 + plt_s
->output_offset
+ plt_offset
);
1745 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
1748 _bfd_x86_elf_hash_symbol (struct elf_link_hash_entry
*h
)
1750 if (h
->plt
.offset
!= (bfd_vma
) -1
1752 && !h
->pointer_equality_needed
)
1755 return _bfd_elf_hash_symbol (h
);
1758 /* Adjust a symbol defined by a dynamic object and referenced by a
1759 regular object. The current definition is in some section of the
1760 dynamic object, but we're not including those sections. We have to
1761 change the definition to something the rest of the link can
1765 _bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1766 struct elf_link_hash_entry
*h
)
1768 struct elf_x86_link_hash_table
*htab
;
1770 struct elf_x86_link_hash_entry
*eh
;
1771 struct elf_dyn_relocs
*p
;
1772 const struct elf_backend_data
*bed
1773 = get_elf_backend_data (info
->output_bfd
);
1775 /* STT_GNU_IFUNC symbol must go through PLT. */
1776 if (h
->type
== STT_GNU_IFUNC
)
1778 /* All local STT_GNU_IFUNC references must be treate as local
1779 calls via local PLT. */
1781 && SYMBOL_CALLS_LOCAL (info
, h
))
1783 bfd_size_type pc_count
= 0, count
= 0;
1784 struct elf_dyn_relocs
**pp
;
1786 eh
= (struct elf_x86_link_hash_entry
*) h
;
1787 for (pp
= &h
->dyn_relocs
; (p
= *pp
) != NULL
; )
1789 pc_count
+= p
->pc_count
;
1790 p
->count
-= p
->pc_count
;
1799 if (pc_count
|| count
)
1804 /* Increment PLT reference count only for PC-relative
1807 if (h
->plt
.refcount
<= 0)
1808 h
->plt
.refcount
= 1;
1810 h
->plt
.refcount
+= 1;
1815 if (h
->plt
.refcount
<= 0)
1817 h
->plt
.offset
= (bfd_vma
) -1;
1823 /* If this is a function, put it in the procedure linkage table. We
1824 will fill in the contents of the procedure linkage table later,
1825 when we know the address of the .got section. */
1826 if (h
->type
== STT_FUNC
1829 if (h
->plt
.refcount
<= 0
1830 || SYMBOL_CALLS_LOCAL (info
, h
)
1831 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1832 && h
->root
.type
== bfd_link_hash_undefweak
))
1834 /* This case can occur if we saw a PLT32 reloc in an input
1835 file, but the symbol was never referred to by a dynamic
1836 object, or if all references were garbage collected. In
1837 such a case, we don't actually need to build a procedure
1838 linkage table, and we can just do a PC32 reloc instead. */
1839 h
->plt
.offset
= (bfd_vma
) -1;
1846 /* It's possible that we incorrectly decided a .plt reloc was needed
1847 * for an R_386_PC32/R_X86_64_PC32 reloc to a non-function sym in
1848 check_relocs. We can't decide accurately between function and
1849 non-function syms in check-relocs; Objects loaded later in
1850 the link may change h->type. So fix it now. */
1851 h
->plt
.offset
= (bfd_vma
) -1;
1853 eh
= (struct elf_x86_link_hash_entry
*) h
;
1855 /* If this is a weak symbol, and there is a real definition, the
1856 processor independent code will have arranged for us to see the
1857 real definition first, and we can just use the same value. */
1858 if (h
->is_weakalias
)
1860 struct elf_link_hash_entry
*def
= weakdef (h
);
1861 BFD_ASSERT (def
->root
.type
== bfd_link_hash_defined
);
1862 h
->root
.u
.def
.section
= def
->root
.u
.def
.section
;
1863 h
->root
.u
.def
.value
= def
->root
.u
.def
.value
;
1864 if (ELIMINATE_COPY_RELOCS
1865 || info
->nocopyreloc
1866 || SYMBOL_NO_COPYRELOC (info
, eh
))
1868 /* NB: needs_copy is always 0 for i386. */
1869 h
->non_got_ref
= def
->non_got_ref
;
1870 eh
->needs_copy
= def
->needs_copy
;
1875 /* This is a reference to a symbol defined by a dynamic object which
1876 is not a function. */
1878 /* If we are creating a shared library, we must presume that the
1879 only references to the symbol are via the global offset table.
1880 For such cases we need not do anything here; the relocations will
1881 be handled correctly by relocate_section. */
1882 if (!bfd_link_executable (info
))
1885 /* If there are no references to this symbol that do not use the
1886 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
1887 reloc. NB: gotoff_ref is always 0 for x86-64. */
1888 if (!h
->non_got_ref
&& !eh
->gotoff_ref
)
1891 /* If -z nocopyreloc was given, we won't generate them either. */
1892 if (info
->nocopyreloc
|| SYMBOL_NO_COPYRELOC (info
, eh
))
1898 htab
= elf_x86_hash_table (info
, bed
->target_id
);
1902 /* If there aren't any dynamic relocs in read-only sections nor
1903 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
1904 avoid the copy reloc. This doesn't work on VxWorks, where we can
1905 not have dynamic relocations (other than copy and jump slot
1906 relocations) in an executable. */
1907 if (ELIMINATE_COPY_RELOCS
1908 && (bed
->target_id
== X86_64_ELF_DATA
1910 && htab
->elf
.target_os
!= is_vxworks
)))
1912 /* If we don't find any dynamic relocs in read-only sections,
1913 then we'll be keeping the dynamic relocs and avoiding the copy
1915 if (!_bfd_elf_readonly_dynrelocs (h
))
1922 /* We must allocate the symbol in our .dynbss section, which will
1923 become part of the .bss section of the executable. There will be
1924 an entry for this symbol in the .dynsym section. The dynamic
1925 object will contain position independent code, so all references
1926 from the dynamic object to this symbol will go through the global
1927 offset table. The dynamic linker will use the .dynsym entry to
1928 determine the address it must put in the global offset table, so
1929 both the dynamic object and the regular object will refer to the
1930 same memory location for the variable. */
1932 /* We must generate a R_386_COPY/R_X86_64_COPY reloc to tell the
1933 dynamic linker to copy the initial value out of the dynamic object
1934 and into the runtime process image. */
1935 if ((h
->root
.u
.def
.section
->flags
& SEC_READONLY
) != 0)
1937 s
= htab
->elf
.sdynrelro
;
1938 srel
= htab
->elf
.sreldynrelro
;
1942 s
= htab
->elf
.sdynbss
;
1943 srel
= htab
->elf
.srelbss
;
1945 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0 && h
->size
!= 0)
1947 srel
->size
+= htab
->sizeof_reloc
;
1951 return _bfd_elf_adjust_dynamic_copy (info
, h
, s
);
1955 _bfd_x86_elf_hide_symbol (struct bfd_link_info
*info
,
1956 struct elf_link_hash_entry
*h
,
1957 bfd_boolean force_local
)
1959 if (h
->root
.type
== bfd_link_hash_undefweak
1961 && bfd_link_pie (info
))
1963 /* When there is no dynamic interpreter in PIE, make the undefined
1964 weak symbol dynamic so that PC relative branch to the undefined
1965 weak symbol will land to address 0. */
1966 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1967 if (h
->plt
.refcount
> 0
1968 || eh
->plt_got
.refcount
> 0)
1972 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
1975 /* Return TRUE if a symbol is referenced locally. It is similar to
1976 SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
1977 works in check_relocs. */
1980 _bfd_x86_elf_link_symbol_references_local (struct bfd_link_info
*info
,
1981 struct elf_link_hash_entry
*h
)
1983 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1984 struct elf_x86_link_hash_table
*htab
1985 = (struct elf_x86_link_hash_table
*) info
->hash
;
1987 if (eh
->local_ref
> 1)
1990 if (eh
->local_ref
== 1)
1993 /* Unversioned symbols defined in regular objects can be forced local
1994 by linker version script. A weak undefined symbol is forced local
1996 1. It has non-default visibility. Or
1997 2. When building executable, there is no dynamic linker. Or
1998 3. or "-z nodynamic-undefined-weak" is used.
2000 if (SYMBOL_REFERENCES_LOCAL (info
, h
)
2001 || (h
->root
.type
== bfd_link_hash_undefweak
2002 && (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2003 || (bfd_link_executable (info
)
2004 && htab
->interp
== NULL
)
2005 || info
->dynamic_undefined_weak
== 0))
2006 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
2007 && info
->version_info
!= NULL
2008 && _bfd_elf_link_hide_sym_by_version (info
, h
)))
2018 /* Return the section that should be marked against GC for a given
2022 _bfd_x86_elf_gc_mark_hook (asection
*sec
,
2023 struct bfd_link_info
*info
,
2024 Elf_Internal_Rela
*rel
,
2025 struct elf_link_hash_entry
*h
,
2026 Elf_Internal_Sym
*sym
)
2028 /* Compiler should optimize this out. */
2029 if (((unsigned int) R_X86_64_GNU_VTINHERIT
2030 != (unsigned int) R_386_GNU_VTINHERIT
)
2031 || ((unsigned int) R_X86_64_GNU_VTENTRY
2032 != (unsigned int) R_386_GNU_VTENTRY
))
2036 switch (ELF32_R_TYPE (rel
->r_info
))
2038 case R_X86_64_GNU_VTINHERIT
:
2039 case R_X86_64_GNU_VTENTRY
:
2043 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
2047 elf_i386_get_plt_got_vma (struct elf_x86_plt
*plt_p ATTRIBUTE_UNUSED
,
2049 bfd_vma offset ATTRIBUTE_UNUSED
,
2052 return got_addr
+ off
;
2056 elf_x86_64_get_plt_got_vma (struct elf_x86_plt
*plt_p
,
2059 bfd_vma got_addr ATTRIBUTE_UNUSED
)
2061 return plt_p
->sec
->vma
+ offset
+ off
+ plt_p
->plt_got_insn_size
;
2065 elf_i386_valid_plt_reloc_p (unsigned int type
)
2067 return (type
== R_386_JUMP_SLOT
2068 || type
== R_386_GLOB_DAT
2069 || type
== R_386_IRELATIVE
);
2073 elf_x86_64_valid_plt_reloc_p (unsigned int type
)
2075 return (type
== R_X86_64_JUMP_SLOT
2076 || type
== R_X86_64_GLOB_DAT
2077 || type
== R_X86_64_IRELATIVE
);
2081 _bfd_x86_elf_get_synthetic_symtab (bfd
*abfd
,
2085 struct elf_x86_plt plts
[],
2089 long size
, i
, n
, len
;
2091 unsigned int plt_got_offset
, plt_entry_size
;
2093 bfd_byte
*plt_contents
;
2095 arelent
**dynrelbuf
, *p
;
2097 const struct elf_backend_data
*bed
;
2098 bfd_vma (*get_plt_got_vma
) (struct elf_x86_plt
*, bfd_vma
, bfd_vma
,
2100 bfd_boolean (*valid_plt_reloc_p
) (unsigned int);
2106 dynrelbuf
= (arelent
**) bfd_malloc (relsize
);
2107 if (dynrelbuf
== NULL
)
2110 dynrelcount
= bfd_canonicalize_dynamic_reloc (abfd
, dynrelbuf
,
2112 if (dynrelcount
<= 0)
2115 /* Sort the relocs by address. */
2116 qsort (dynrelbuf
, dynrelcount
, sizeof (arelent
*),
2117 _bfd_x86_elf_compare_relocs
);
2119 size
= count
* sizeof (asymbol
);
2121 /* Allocate space for @plt suffixes. */
2123 for (i
= 0; i
< dynrelcount
; i
++)
2126 size
+= strlen ((*p
->sym_ptr_ptr
)->name
) + sizeof ("@plt");
2128 size
+= sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd
);
2131 s
= *ret
= (asymbol
*) bfd_zmalloc (size
);
2135 bed
= get_elf_backend_data (abfd
);
2137 if (bed
->target_id
== X86_64_ELF_DATA
)
2139 get_plt_got_vma
= elf_x86_64_get_plt_got_vma
;
2140 valid_plt_reloc_p
= elf_x86_64_valid_plt_reloc_p
;
2144 get_plt_got_vma
= elf_i386_get_plt_got_vma
;
2145 valid_plt_reloc_p
= elf_i386_valid_plt_reloc_p
;
2148 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
2150 asection
*sec
= bfd_get_section_by_name (abfd
, ".got.plt");
2152 got_addr
= sec
->vma
;
2155 sec
= bfd_get_section_by_name (abfd
, ".got");
2157 got_addr
= sec
->vma
;
2160 if (got_addr
== (bfd_vma
) -1)
2165 /* Check for each PLT section. */
2166 names
= (char *) (s
+ count
);
2169 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
2170 if ((plt_contents
= plts
[j
].contents
) != NULL
)
2175 struct elf_x86_plt
*plt_p
= &plts
[j
];
2177 plt_got_offset
= plt_p
->plt_got_offset
;
2178 plt_entry_size
= plt_p
->plt_entry_size
;
2182 if ((plt_p
->type
& plt_lazy
))
2184 /* Skip PLT0 in lazy PLT. */
2186 offset
= plt_entry_size
;
2194 /* Check each PLT entry against dynamic relocations. */
2195 for (; k
< plt_p
->count
; k
++)
2201 /* Get the GOT offset for i386 or the PC-relative offset
2202 for x86-64, a signed 32-bit integer. */
2203 off
= H_GET_32 (abfd
, (plt_contents
+ offset
2205 got_vma
= get_plt_got_vma (plt_p
, off
, offset
, got_addr
);
2207 /* Binary search. */
2211 while ((min
+ 1) < max
)
2215 mid
= (min
+ max
) / 2;
2217 if (got_vma
> r
->address
)
2219 else if (got_vma
< r
->address
)
2228 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
2229 if (got_vma
== p
->address
2231 && valid_plt_reloc_p (p
->howto
->type
))
2233 *s
= **p
->sym_ptr_ptr
;
2234 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
2235 set. Since we are defining a symbol, ensure one
2237 if ((s
->flags
& BSF_LOCAL
) == 0)
2238 s
->flags
|= BSF_GLOBAL
;
2239 s
->flags
|= BSF_SYNTHETIC
;
2240 /* This is no longer a section symbol. */
2241 s
->flags
&= ~BSF_SECTION_SYM
;
2243 s
->the_bfd
= plt
->owner
;
2247 len
= strlen ((*p
->sym_ptr_ptr
)->name
);
2248 memcpy (names
, (*p
->sym_ptr_ptr
)->name
, len
);
2254 memcpy (names
, "+0x", sizeof ("+0x") - 1);
2255 names
+= sizeof ("+0x") - 1;
2256 bfd_sprintf_vma (abfd
, buf
, p
->addend
);
2257 for (a
= buf
; *a
== '0'; ++a
)
2260 memcpy (names
, a
, size
);
2263 memcpy (names
, "@plt", sizeof ("@plt"));
2264 names
+= sizeof ("@plt");
2267 /* There should be only one entry in PLT for a given
2268 symbol. Set howto to NULL after processing a PLT
2269 entry to guard against corrupted PLT. */
2272 offset
+= plt_entry_size
;
2276 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
2285 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
2286 free (plts
[j
].contents
);
2293 /* Parse x86 GNU properties. */
2295 enum elf_property_kind
2296 _bfd_x86_elf_parse_gnu_properties (bfd
*abfd
, unsigned int type
,
2297 bfd_byte
*ptr
, unsigned int datasz
)
2301 if (type
== GNU_PROPERTY_X86_COMPAT_ISA_1_USED
2302 || type
== GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
2303 || (type
>= GNU_PROPERTY_X86_UINT32_AND_LO
2304 && type
<= GNU_PROPERTY_X86_UINT32_AND_HI
)
2305 || (type
>= GNU_PROPERTY_X86_UINT32_OR_LO
2306 && type
<= GNU_PROPERTY_X86_UINT32_OR_HI
)
2307 || (type
>= GNU_PROPERTY_X86_UINT32_OR_AND_LO
2308 && type
<= GNU_PROPERTY_X86_UINT32_OR_AND_HI
))
2313 (_("error: %pB: <corrupt x86 property (0x%x) size: 0x%x>"),
2314 abfd
, type
, datasz
);
2315 return property_corrupt
;
2317 prop
= _bfd_elf_get_property (abfd
, type
, datasz
);
2318 prop
->u
.number
|= bfd_h_get_32 (abfd
, ptr
);
2319 prop
->pr_kind
= property_number
;
2320 return property_number
;
2323 return property_ignored
;
2326 /* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
2327 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
2328 should be merged with ABFD. */
2331 _bfd_x86_elf_merge_gnu_properties (struct bfd_link_info
*info
,
2332 bfd
*abfd ATTRIBUTE_UNUSED
,
2333 bfd
*bbfd ATTRIBUTE_UNUSED
,
2334 elf_property
*aprop
,
2335 elf_property
*bprop
)
2337 unsigned int number
, features
;
2338 bfd_boolean updated
= FALSE
;
2339 const struct elf_backend_data
*bed
;
2340 struct elf_x86_link_hash_table
*htab
;
2341 unsigned int pr_type
= aprop
!= NULL
? aprop
->pr_type
: bprop
->pr_type
;
2343 if (pr_type
== GNU_PROPERTY_X86_COMPAT_ISA_1_USED
2344 || (pr_type
>= GNU_PROPERTY_X86_UINT32_OR_AND_LO
2345 && pr_type
<= GNU_PROPERTY_X86_UINT32_OR_AND_HI
))
2347 if (aprop
== NULL
|| bprop
== NULL
)
2349 /* Only one of APROP and BPROP can be NULL. */
2352 /* Remove this property since the other input file doesn't
2354 aprop
->pr_kind
= property_remove
;
2360 number
= aprop
->u
.number
;
2361 aprop
->u
.number
= number
| bprop
->u
.number
;
2362 updated
= number
!= (unsigned int) aprop
->u
.number
;
2366 else if (pr_type
== GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
2367 || (pr_type
>= GNU_PROPERTY_X86_UINT32_OR_LO
2368 && pr_type
<= GNU_PROPERTY_X86_UINT32_OR_HI
))
2371 if (pr_type
== GNU_PROPERTY_X86_ISA_1_NEEDED
)
2373 bed
= get_elf_backend_data (info
->output_bfd
);
2374 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2375 switch (htab
->params
->isa_level
)
2380 features
= GNU_PROPERTY_X86_ISA_1_V2
;
2383 features
= GNU_PROPERTY_X86_ISA_1_V3
;
2386 features
= GNU_PROPERTY_X86_ISA_1_V4
;
2392 if (aprop
!= NULL
&& bprop
!= NULL
)
2394 number
= aprop
->u
.number
;
2395 aprop
->u
.number
= number
| bprop
->u
.number
| features
;
2396 /* Remove the property if all bits are empty. */
2397 if (aprop
->u
.number
== 0)
2399 aprop
->pr_kind
= property_remove
;
2403 updated
= number
!= (unsigned int) aprop
->u
.number
;
2407 /* Only one of APROP and BPROP can be NULL. */
2410 aprop
->u
.number
|= features
;
2411 if (aprop
->u
.number
== 0)
2413 /* Remove APROP if all bits are empty. */
2414 aprop
->pr_kind
= property_remove
;
2420 /* Return TRUE if APROP is NULL and all bits of BPROP
2421 aren't empty to indicate that BPROP should be added
2423 bprop
->u
.number
|= features
;
2424 updated
= bprop
->u
.number
!= 0;
2429 else if (pr_type
>= GNU_PROPERTY_X86_UINT32_AND_LO
2430 && pr_type
<= GNU_PROPERTY_X86_UINT32_AND_HI
)
2432 /* Only one of APROP and BPROP can be NULL:
2433 1. APROP & BPROP when both APROP and BPROP aren't NULL.
2434 2. If APROP is NULL, remove x86 feature.
2435 3. Otherwise, do nothing.
2437 bed
= get_elf_backend_data (info
->output_bfd
);
2438 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2441 if (aprop
!= NULL
&& bprop
!= NULL
)
2443 number
= aprop
->u
.number
;
2444 aprop
->u
.number
= number
& bprop
->u
.number
;
2445 if (pr_type
== GNU_PROPERTY_X86_FEATURE_1_AND
)
2448 if (htab
->params
->ibt
)
2449 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2450 if (htab
->params
->shstk
)
2451 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2452 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
2453 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
2454 aprop
->u
.number
|= features
;
2456 updated
= number
!= (unsigned int) aprop
->u
.number
;
2457 /* Remove the property if all feature bits are cleared. */
2458 if (aprop
->u
.number
== 0)
2459 aprop
->pr_kind
= property_remove
;
2463 /* There should be no AND properties since some input doesn't
2464 have them. Set IBT and SHSTK properties for -z ibt and -z
2467 if (pr_type
== GNU_PROPERTY_X86_FEATURE_1_AND
)
2469 if (htab
->params
->ibt
)
2470 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2471 if (htab
->params
->shstk
)
2472 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2478 updated
= features
!= (unsigned int) aprop
->u
.number
;
2479 aprop
->u
.number
= features
;
2484 bprop
->u
.number
= features
;
2487 else if (aprop
!= NULL
)
2489 aprop
->pr_kind
= property_remove
;
2497 /* Never should happen. */
2504 /* Set up x86 GNU properties. Return the first relocatable ELF input
2505 with GNU properties if found. Otherwise, return NULL. */
2508 _bfd_x86_elf_link_setup_gnu_properties
2509 (struct bfd_link_info
*info
, struct elf_x86_init_table
*init_table
)
2511 bfd_boolean normal_target
;
2512 bfd_boolean lazy_plt
;
2513 asection
*sec
, *pltsec
;
2515 bfd_boolean use_ibt_plt
;
2516 unsigned int plt_alignment
, features
, isa_level
;
2517 struct elf_x86_link_hash_table
*htab
;
2521 const struct elf_backend_data
*bed
;
2522 unsigned int class_align
= ABI_64_P (info
->output_bfd
) ? 3 : 2;
2523 unsigned int got_align
;
2525 /* Find a normal input file with GNU property note. */
2526 for (pbfd
= info
->input_bfds
;
2528 pbfd
= pbfd
->link
.next
)
2529 if (bfd_get_flavour (pbfd
) == bfd_target_elf_flavour
2530 && bfd_count_sections (pbfd
) != 0)
2534 if (elf_properties (pbfd
) != NULL
)
2538 bed
= get_elf_backend_data (info
->output_bfd
);
2540 htab
= elf_x86_hash_table (info
, bed
->target_id
);
2545 if (htab
->params
->ibt
)
2547 features
= GNU_PROPERTY_X86_FEATURE_1_IBT
;
2548 htab
->params
->cet_report
&= ~prop_report_ibt
;
2550 if (htab
->params
->shstk
)
2552 features
|= GNU_PROPERTY_X86_FEATURE_1_SHSTK
;
2553 htab
->params
->cet_report
&= ~prop_report_shstk
;
2555 if (!(htab
->params
->cet_report
& (prop_report_ibt
| prop_report_shstk
)))
2556 htab
->params
->cet_report
= prop_report_none
;
2557 if (htab
->params
->lam_u48
)
2559 features
|= GNU_PROPERTY_X86_FEATURE_1_LAM_U48
;
2560 htab
->params
->lam_u48_report
= prop_report_none
;
2562 if (htab
->params
->lam_u57
)
2564 features
|= GNU_PROPERTY_X86_FEATURE_1_LAM_U57
;
2565 htab
->params
->lam_u57_report
= prop_report_none
;
2568 switch (htab
->params
->isa_level
)
2574 isa_level
= GNU_PROPERTY_X86_ISA_1_BASELINE
;
2577 isa_level
= GNU_PROPERTY_X86_ISA_1_V2
;
2580 isa_level
= GNU_PROPERTY_X86_ISA_1_V3
;
2583 isa_level
= GNU_PROPERTY_X86_ISA_1_V4
;
2594 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT,
2595 GNU_PROPERTY_X86_FEATURE_1_SHSTK,
2596 GNU_PROPERTY_X86_FEATURE_1_LAM_U48 and
2597 GNU_PROPERTY_X86_FEATURE_1_LAM_U57. */
2598 prop
= _bfd_elf_get_property (ebfd
,
2599 GNU_PROPERTY_X86_FEATURE_1_AND
,
2601 prop
->u
.number
|= features
;
2602 prop
->pr_kind
= property_number
;
2607 /* If ISA level is set, add GNU_PROPERTY_X86_ISA_1_NEEDED. */
2608 prop
= _bfd_elf_get_property (ebfd
,
2609 GNU_PROPERTY_X86_ISA_1_NEEDED
,
2611 prop
->u
.number
|= isa_level
;
2612 prop
->pr_kind
= property_number
;
2615 /* Create the GNU property note section if needed. */
2616 if (prop
!= NULL
&& pbfd
== NULL
)
2618 sec
= bfd_make_section_with_flags (ebfd
,
2619 NOTE_GNU_PROPERTY_SECTION_NAME
,
2627 info
->callbacks
->einfo (_("%F%P: failed to create GNU property section\n"));
2629 if (!bfd_set_section_alignment (sec
, class_align
))
2632 info
->callbacks
->einfo (_("%F%pA: failed to align section\n"),
2636 elf_section_type (sec
) = SHT_NOTE
;
2640 if (htab
->params
->cet_report
2641 || htab
->params
->lam_u48_report
2642 || htab
->params
->lam_u57_report
)
2644 /* Report missing IBT, SHSTK and LAM properties. */
2646 const char *warning_msg
= _("%P: %pB: warning: missing %s\n");
2647 const char *error_msg
= _("%X%P: %pB: error: missing %s\n");
2648 const char *cet_msg
= NULL
;
2649 const char *lam_u48_msg
= NULL
;
2650 const char *lam_u57_msg
= NULL
;
2651 const char *missing
;
2652 elf_property_list
*p
;
2653 bfd_boolean missing_ibt
, missing_shstk
;
2654 bfd_boolean missing_lam_u48
, missing_lam_u57
;
2655 bfd_boolean check_ibt
2656 = (htab
->params
->cet_report
2657 && (htab
->params
->cet_report
& prop_report_ibt
));
2658 bfd_boolean check_shstk
2659 = (htab
->params
->cet_report
2660 && (htab
->params
->cet_report
& prop_report_shstk
));
2662 if (htab
->params
->cet_report
)
2664 if ((htab
->params
->cet_report
& prop_report_warning
))
2665 cet_msg
= warning_msg
;
2667 cet_msg
= error_msg
;
2669 if (htab
->params
->lam_u48_report
)
2671 if ((htab
->params
->lam_u48_report
& prop_report_warning
))
2672 lam_u48_msg
= warning_msg
;
2674 lam_u48_msg
= error_msg
;
2676 if (htab
->params
->lam_u57_report
)
2678 if ((htab
->params
->lam_u57_report
& prop_report_warning
))
2679 lam_u57_msg
= warning_msg
;
2681 lam_u57_msg
= error_msg
;
2684 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
2685 if (!(abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
2686 && bfd_get_flavour (abfd
) == bfd_target_elf_flavour
)
2688 for (p
= elf_properties (abfd
); p
; p
= p
->next
)
2689 if (p
->property
.pr_type
== GNU_PROPERTY_X86_FEATURE_1_AND
)
2692 missing_ibt
= check_ibt
;
2693 missing_shstk
= check_shstk
;
2694 missing_lam_u48
= !!lam_u48_msg
;
2695 missing_lam_u57
= !!lam_u57_msg
;
2698 missing_ibt
&= !(p
->property
.u
.number
2699 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
2700 missing_shstk
&= !(p
->property
.u
.number
2701 & GNU_PROPERTY_X86_FEATURE_1_SHSTK
);
2702 missing_lam_u48
&= !(p
->property
.u
.number
2703 & GNU_PROPERTY_X86_FEATURE_1_LAM_U48
);
2704 missing_lam_u57
&= !(p
->property
.u
.number
2705 & GNU_PROPERTY_X86_FEATURE_1_LAM_U57
);
2707 if (missing_ibt
|| missing_shstk
)
2709 if (missing_ibt
&& missing_shstk
)
2710 missing
= _("IBT and SHSTK properties");
2711 else if (missing_ibt
)
2712 missing
= _("IBT property");
2714 missing
= _("SHSTK property");
2715 info
->callbacks
->einfo (cet_msg
, abfd
, missing
);
2717 if (missing_lam_u48
)
2719 missing
= _("LAM_U48 property");
2720 info
->callbacks
->einfo (lam_u48_msg
, abfd
, missing
);
2722 if (missing_lam_u57
)
2724 missing
= _("LAM_U57 property");
2725 info
->callbacks
->einfo (lam_u57_msg
, abfd
, missing
);
2730 pbfd
= _bfd_elf_link_setup_gnu_properties (info
);
2732 htab
->r_info
= init_table
->r_info
;
2733 htab
->r_sym
= init_table
->r_sym
;
2735 if (bfd_link_relocatable (info
))
2738 htab
->plt0_pad_byte
= init_table
->plt0_pad_byte
;
2740 use_ibt_plt
= htab
->params
->ibtplt
|| htab
->params
->ibt
;
2741 if (!use_ibt_plt
&& pbfd
!= NULL
)
2743 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
2744 elf_property_list
*p
;
2746 /* The property list is sorted in order of type. */
2747 for (p
= elf_properties (pbfd
); p
; p
= p
->next
)
2749 if (GNU_PROPERTY_X86_FEATURE_1_AND
== p
->property
.pr_type
)
2751 use_ibt_plt
= !!(p
->property
.u
.number
2752 & GNU_PROPERTY_X86_FEATURE_1_IBT
);
2755 else if (GNU_PROPERTY_X86_FEATURE_1_AND
< p
->property
.pr_type
)
2760 dynobj
= htab
->elf
.dynobj
;
2762 /* Set htab->elf.dynobj here so that there is no need to check and
2763 set it in check_relocs. */
2768 htab
->elf
.dynobj
= pbfd
;
2775 /* Find a normal input file to hold linker created
2777 for (abfd
= info
->input_bfds
;
2779 abfd
= abfd
->link
.next
)
2780 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2782 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
2783 && bed
->relocs_compatible (abfd
->xvec
,
2784 info
->output_bfd
->xvec
))
2786 htab
->elf
.dynobj
= abfd
;
2793 /* Return if there are no normal input files. */
2797 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
2798 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
2799 canonical function address. */
2800 htab
->plt
.has_plt0
= 1;
2801 normal_target
= htab
->elf
.target_os
== is_normal
;
2807 htab
->lazy_plt
= init_table
->lazy_ibt_plt
;
2808 htab
->non_lazy_plt
= init_table
->non_lazy_ibt_plt
;
2812 htab
->lazy_plt
= init_table
->lazy_plt
;
2813 htab
->non_lazy_plt
= init_table
->non_lazy_plt
;
2818 htab
->lazy_plt
= init_table
->lazy_plt
;
2819 htab
->non_lazy_plt
= NULL
;
2822 pltsec
= htab
->elf
.splt
;
2824 /* If the non-lazy PLT is available, use it for all PLT entries if
2825 there are no PLT0 or no .plt section. */
2826 if (htab
->non_lazy_plt
!= NULL
2827 && (!htab
->plt
.has_plt0
|| pltsec
== NULL
))
2830 if (bfd_link_pic (info
))
2831 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->pic_plt_entry
;
2833 htab
->plt
.plt_entry
= htab
->non_lazy_plt
->plt_entry
;
2834 htab
->plt
.plt_entry_size
= htab
->non_lazy_plt
->plt_entry_size
;
2835 htab
->plt
.plt_got_offset
= htab
->non_lazy_plt
->plt_got_offset
;
2836 htab
->plt
.plt_got_insn_size
2837 = htab
->non_lazy_plt
->plt_got_insn_size
;
2838 htab
->plt
.eh_frame_plt_size
2839 = htab
->non_lazy_plt
->eh_frame_plt_size
;
2840 htab
->plt
.eh_frame_plt
= htab
->non_lazy_plt
->eh_frame_plt
;
2845 if (bfd_link_pic (info
))
2847 htab
->plt
.plt0_entry
= htab
->lazy_plt
->pic_plt0_entry
;
2848 htab
->plt
.plt_entry
= htab
->lazy_plt
->pic_plt_entry
;
2852 htab
->plt
.plt0_entry
= htab
->lazy_plt
->plt0_entry
;
2853 htab
->plt
.plt_entry
= htab
->lazy_plt
->plt_entry
;
2855 htab
->plt
.plt_entry_size
= htab
->lazy_plt
->plt_entry_size
;
2856 htab
->plt
.plt_got_offset
= htab
->lazy_plt
->plt_got_offset
;
2857 htab
->plt
.plt_got_insn_size
2858 = htab
->lazy_plt
->plt_got_insn_size
;
2859 htab
->plt
.eh_frame_plt_size
2860 = htab
->lazy_plt
->eh_frame_plt_size
;
2861 htab
->plt
.eh_frame_plt
= htab
->lazy_plt
->eh_frame_plt
;
2864 if (htab
->elf
.target_os
== is_vxworks
2865 && !elf_vxworks_create_dynamic_sections (dynobj
, info
,
2868 info
->callbacks
->einfo (_("%F%P: failed to create VxWorks dynamic sections\n"));
2872 /* Since create_dynamic_sections isn't always called, but GOT
2873 relocations need GOT relocations, create them here so that we
2874 don't need to do it in check_relocs. */
2875 if (htab
->elf
.sgot
== NULL
2876 && !_bfd_elf_create_got_section (dynobj
, info
))
2877 info
->callbacks
->einfo (_("%F%P: failed to create GOT sections\n"));
2879 got_align
= (bed
->target_id
== X86_64_ELF_DATA
) ? 3 : 2;
2881 /* Align .got and .got.plt sections to their entry size. Do it here
2882 instead of in create_dynamic_sections so that they are always
2883 properly aligned even if create_dynamic_sections isn't called. */
2884 sec
= htab
->elf
.sgot
;
2885 if (!bfd_set_section_alignment (sec
, got_align
))
2886 goto error_alignment
;
2888 sec
= htab
->elf
.sgotplt
;
2889 if (!bfd_set_section_alignment (sec
, got_align
))
2890 goto error_alignment
;
2892 /* Create the ifunc sections here so that check_relocs can be
2894 if (!_bfd_elf_create_ifunc_sections (dynobj
, info
))
2895 info
->callbacks
->einfo (_("%F%P: failed to create ifunc sections\n"));
2897 plt_alignment
= bfd_log2 (htab
->plt
.plt_entry_size
);
2901 /* Whe creating executable, set the contents of the .interp
2902 section to the interpreter. */
2903 if (bfd_link_executable (info
) && !info
->nointerp
)
2905 asection
*s
= bfd_get_linker_section (dynobj
, ".interp");
2908 s
->size
= htab
->dynamic_interpreter_size
;
2909 s
->contents
= (unsigned char *) htab
->dynamic_interpreter
;
2915 flagword pltflags
= (bed
->dynamic_sec_flags
2920 unsigned int non_lazy_plt_alignment
2921 = bfd_log2 (htab
->non_lazy_plt
->plt_entry_size
);
2924 if (!bfd_set_section_alignment (sec
, plt_alignment
))
2925 goto error_alignment
;
2927 /* Create the GOT procedure linkage table. */
2928 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2932 info
->callbacks
->einfo (_("%F%P: failed to create GOT PLT section\n"));
2934 if (!bfd_set_section_alignment (sec
, non_lazy_plt_alignment
))
2935 goto error_alignment
;
2937 htab
->plt_got
= sec
;
2945 /* Create the second PLT for Intel IBT support. IBT
2946 PLT is needed only for lazy binding. */
2947 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2951 info
->callbacks
->einfo (_("%F%P: failed to create IBT-enabled PLT section\n"));
2953 if (!bfd_set_section_alignment (sec
, plt_alignment
))
2954 goto error_alignment
;
2956 else if (htab
->params
->bndplt
&& ABI_64_P (dynobj
))
2958 /* Create the second PLT for Intel MPX support. MPX
2959 PLT is supported only in 64-bit mode and is needed
2960 only for lazy binding. */
2961 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2965 info
->callbacks
->einfo (_("%F%P: failed to create BND PLT section\n"));
2967 if (!bfd_set_section_alignment (sec
, non_lazy_plt_alignment
))
2968 goto error_alignment
;
2971 htab
->plt_second
= sec
;
2975 if (!info
->no_ld_generated_unwind_info
)
2977 flagword flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
2978 | SEC_HAS_CONTENTS
| SEC_IN_MEMORY
2979 | SEC_LINKER_CREATED
);
2981 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2985 info
->callbacks
->einfo (_("%F%P: failed to create PLT .eh_frame section\n"));
2987 if (!bfd_set_section_alignment (sec
, class_align
))
2988 goto error_alignment
;
2990 htab
->plt_eh_frame
= sec
;
2992 if (htab
->plt_got
!= NULL
)
2994 sec
= bfd_make_section_anyway_with_flags (dynobj
,
2998 info
->callbacks
->einfo (_("%F%P: failed to create GOT PLT .eh_frame section\n"));
3000 if (!bfd_set_section_alignment (sec
, class_align
))
3001 goto error_alignment
;
3003 htab
->plt_got_eh_frame
= sec
;
3006 if (htab
->plt_second
!= NULL
)
3008 sec
= bfd_make_section_anyway_with_flags (dynobj
,
3012 info
->callbacks
->einfo (_("%F%P: failed to create the second PLT .eh_frame section\n"));
3014 if (!bfd_set_section_alignment (sec
, class_align
))
3015 goto error_alignment
;
3017 htab
->plt_second_eh_frame
= sec
;
3022 /* The .iplt section is used for IFUNC symbols in static
3024 sec
= htab
->elf
.iplt
;
3027 /* NB: Delay setting its alignment until we know it is non-empty.
3028 Otherwise an empty iplt section may change vma and lma of the
3029 following sections, which triggers moving dot of the following
3030 section backwards, resulting in a warning and section lma not
3031 being set properly. It later leads to a "File truncated"
3033 if (!bfd_set_section_alignment (sec
, 0))
3034 goto error_alignment
;
3036 htab
->plt
.iplt_alignment
= (normal_target
3038 : bed
->plt_alignment
);
3041 if (bfd_link_executable (info
)
3043 && !htab
->params
->has_dynamic_linker
3044 && htab
->params
->static_before_all_inputs
)
3046 /* Report error for dynamic input objects if -static is passed at
3047 command-line before all input files without --dynamic-linker
3048 unless --no-dynamic-linker is used. */
3051 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
3052 if ((abfd
->flags
& DYNAMIC
))
3053 info
->callbacks
->einfo
3054 (_("%X%P: attempted static link of dynamic object `%pB'\n"),
3061 /* Fix up x86 GNU properties. */
3064 _bfd_x86_elf_link_fixup_gnu_properties
3065 (struct bfd_link_info
*info
, elf_property_list
**listp
)
3067 elf_property_list
*p
;
3069 for (p
= *listp
; p
; p
= p
->next
)
3071 unsigned int type
= p
->property
.pr_type
;
3072 if (type
== GNU_PROPERTY_X86_COMPAT_ISA_1_USED
3073 || type
== GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
3074 || (type
>= GNU_PROPERTY_X86_UINT32_AND_LO
3075 && type
<= GNU_PROPERTY_X86_UINT32_AND_HI
)
3076 || (type
>= GNU_PROPERTY_X86_UINT32_OR_LO
3077 && type
<= GNU_PROPERTY_X86_UINT32_OR_HI
)
3078 || (type
>= GNU_PROPERTY_X86_UINT32_OR_AND_LO
3079 && type
<= GNU_PROPERTY_X86_UINT32_OR_AND_HI
))
3081 if (p
->property
.u
.number
== 0
3082 && (type
== GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
3083 || (type
>= GNU_PROPERTY_X86_UINT32_AND_LO
3084 && type
<= GNU_PROPERTY_X86_UINT32_AND_HI
)
3085 || (type
>= GNU_PROPERTY_X86_UINT32_OR_LO
3086 && type
<= GNU_PROPERTY_X86_UINT32_OR_HI
)))
3088 /* Remove empty property. */
3093 /* Keep LAM features only for 64-bit output. */
3094 if (type
== GNU_PROPERTY_X86_FEATURE_1_AND
3095 && !ABI_64_P (info
->output_bfd
))
3096 p
->property
.u
.number
&= ~(GNU_PROPERTY_X86_FEATURE_1_LAM_U48
3097 | GNU_PROPERTY_X86_FEATURE_1_LAM_U57
);
3101 else if (type
> GNU_PROPERTY_HIPROC
)
3103 /* The property list is sorted in order of type. */
3110 _bfd_elf_linker_x86_set_options (struct bfd_link_info
* info
,
3111 struct elf_linker_x86_params
*params
)
3113 const struct elf_backend_data
*bed
3114 = get_elf_backend_data (info
->output_bfd
);
3115 struct elf_x86_link_hash_table
*htab
3116 = elf_x86_hash_table (info
, bed
->target_id
);
3118 htab
->params
= params
;