1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info
*info
;
42 /* This structure is used to pass information to
43 _bfd_elf_link_find_version_dependencies. */
45 struct elf_find_verdep_info
47 /* General link information. */
48 struct bfd_link_info
*info
;
49 /* The number of dependencies. */
51 /* Whether we had a failure. */
55 static bfd_boolean _bfd_elf_fix_symbol_flags
56 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
58 /* Define a symbol in a dynamic linkage section. */
60 struct elf_link_hash_entry
*
61 _bfd_elf_define_linkage_sym (bfd
*abfd
,
62 struct bfd_link_info
*info
,
66 struct elf_link_hash_entry
*h
;
67 struct bfd_link_hash_entry
*bh
;
68 const struct elf_backend_data
*bed
;
70 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
73 /* Zap symbol defined in an as-needed lib that wasn't linked.
74 This is a symptom of a larger problem: Absolute symbols
75 defined in shared libraries can't be overridden, because we
76 lose the link to the bfd which is via the symbol section. */
77 h
->root
.type
= bfd_link_hash_new
;
81 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
83 get_elf_backend_data (abfd
)->collect
,
86 h
= (struct elf_link_hash_entry
*) bh
;
90 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
92 bed
= get_elf_backend_data (abfd
);
93 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
98 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
102 struct elf_link_hash_entry
*h
;
103 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
104 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
106 /* This function may be called more than once. */
107 s
= bfd_get_linker_section (abfd
, ".got");
111 flags
= bed
->dynamic_sec_flags
;
113 s
= bfd_make_section_anyway_with_flags (abfd
,
114 (bed
->rela_plts_and_copies_p
115 ? ".rela.got" : ".rel.got"),
116 (bed
->dynamic_sec_flags
119 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
123 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
125 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
129 if (bed
->want_got_plt
)
131 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
133 || !bfd_set_section_alignment (abfd
, s
,
134 bed
->s
->log_file_align
))
139 /* The first bit of the global offset table is the header. */
140 s
->size
+= bed
->got_header_size
;
142 if (bed
->want_got_sym
)
144 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
145 (or .got.plt) section. We don't do this in the linker script
146 because we don't want to define the symbol if we are not creating
147 a global offset table. */
148 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
149 "_GLOBAL_OFFSET_TABLE_");
150 elf_hash_table (info
)->hgot
= h
;
158 /* Create a strtab to hold the dynamic symbol names. */
160 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
162 struct elf_link_hash_table
*hash_table
;
164 hash_table
= elf_hash_table (info
);
165 if (hash_table
->dynobj
== NULL
)
166 hash_table
->dynobj
= abfd
;
168 if (hash_table
->dynstr
== NULL
)
170 hash_table
->dynstr
= _bfd_elf_strtab_init ();
171 if (hash_table
->dynstr
== NULL
)
177 /* Create some sections which will be filled in with dynamic linking
178 information. ABFD is an input file which requires dynamic sections
179 to be created. The dynamic sections take up virtual memory space
180 when the final executable is run, so we need to create them before
181 addresses are assigned to the output sections. We work out the
182 actual contents and size of these sections later. */
185 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
189 const struct elf_backend_data
*bed
;
190 struct elf_link_hash_entry
*h
;
192 if (! is_elf_hash_table (info
->hash
))
195 if (elf_hash_table (info
)->dynamic_sections_created
)
198 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
201 abfd
= elf_hash_table (info
)->dynobj
;
202 bed
= get_elf_backend_data (abfd
);
204 flags
= bed
->dynamic_sec_flags
;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info
->executable
)
210 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
211 flags
| SEC_READONLY
);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
219 flags
| SEC_READONLY
);
221 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
224 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
225 flags
| SEC_READONLY
);
227 || ! bfd_set_section_alignment (abfd
, s
, 1))
230 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
231 flags
| SEC_READONLY
);
233 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
236 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
237 flags
| SEC_READONLY
);
239 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
242 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
243 flags
| SEC_READONLY
);
247 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
249 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
259 elf_hash_table (info
)->hdynamic
= h
;
265 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
266 flags
| SEC_READONLY
);
268 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
270 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
273 if (info
->emit_gnu_hash
)
275 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
276 flags
| SEC_READONLY
);
278 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
280 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
281 4 32-bit words followed by variable count of 64-bit words, then
282 variable count of 32-bit words. */
283 if (bed
->s
->arch_size
== 64)
284 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
286 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
289 /* Let the backend create the rest of the sections. This lets the
290 backend set the right flags. The backend will normally create
291 the .got and .plt sections. */
292 if (bed
->elf_backend_create_dynamic_sections
== NULL
293 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
296 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
301 /* Create dynamic sections when linking against a dynamic object. */
304 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
306 flagword flags
, pltflags
;
307 struct elf_link_hash_entry
*h
;
309 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
310 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
312 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
313 .rel[a].bss sections. */
314 flags
= bed
->dynamic_sec_flags
;
317 if (bed
->plt_not_loaded
)
318 /* We do not clear SEC_ALLOC here because we still want the OS to
319 allocate space for the section; it's just that there's nothing
320 to read in from the object file. */
321 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
323 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
324 if (bed
->plt_readonly
)
325 pltflags
|= SEC_READONLY
;
327 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
329 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
333 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
335 if (bed
->want_plt_sym
)
337 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
338 "_PROCEDURE_LINKAGE_TABLE_");
339 elf_hash_table (info
)->hplt
= h
;
344 s
= bfd_make_section_anyway_with_flags (abfd
,
345 (bed
->rela_plts_and_copies_p
346 ? ".rela.plt" : ".rel.plt"),
347 flags
| SEC_READONLY
);
349 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
353 if (! _bfd_elf_create_got_section (abfd
, info
))
356 if (bed
->want_dynbss
)
358 /* The .dynbss section is a place to put symbols which are defined
359 by dynamic objects, are referenced by regular objects, and are
360 not functions. We must allocate space for them in the process
361 image and use a R_*_COPY reloc to tell the dynamic linker to
362 initialize them at run time. The linker script puts the .dynbss
363 section into the .bss section of the final image. */
364 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
365 (SEC_ALLOC
| SEC_LINKER_CREATED
));
369 /* The .rel[a].bss section holds copy relocs. This section is not
370 normally needed. We need to create it here, though, so that the
371 linker will map it to an output section. We can't just create it
372 only if we need it, because we will not know whether we need it
373 until we have seen all the input files, and the first time the
374 main linker code calls BFD after examining all the input files
375 (size_dynamic_sections) the input sections have already been
376 mapped to the output sections. If the section turns out not to
377 be needed, we can discard it later. We will never need this
378 section when generating a shared object, since they do not use
382 s
= bfd_make_section_anyway_with_flags (abfd
,
383 (bed
->rela_plts_and_copies_p
384 ? ".rela.bss" : ".rel.bss"),
385 flags
| SEC_READONLY
);
387 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
395 /* Record a new dynamic symbol. We record the dynamic symbols as we
396 read the input files, since we need to have a list of all of them
397 before we can determine the final sizes of the output sections.
398 Note that we may actually call this function even though we are not
399 going to output any dynamic symbols; in some cases we know that a
400 symbol should be in the dynamic symbol table, but only if there is
404 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
405 struct elf_link_hash_entry
*h
)
407 if (h
->dynindx
== -1)
409 struct elf_strtab_hash
*dynstr
;
414 /* XXX: The ABI draft says the linker must turn hidden and
415 internal symbols into STB_LOCAL symbols when producing the
416 DSO. However, if ld.so honors st_other in the dynamic table,
417 this would not be necessary. */
418 switch (ELF_ST_VISIBILITY (h
->other
))
422 if (h
->root
.type
!= bfd_link_hash_undefined
423 && h
->root
.type
!= bfd_link_hash_undefweak
)
426 if (!elf_hash_table (info
)->is_relocatable_executable
)
434 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
435 ++elf_hash_table (info
)->dynsymcount
;
437 dynstr
= elf_hash_table (info
)->dynstr
;
440 /* Create a strtab to hold the dynamic symbol names. */
441 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
446 /* We don't put any version information in the dynamic string
448 name
= h
->root
.root
.string
;
449 p
= strchr (name
, ELF_VER_CHR
);
451 /* We know that the p points into writable memory. In fact,
452 there are only a few symbols that have read-only names, being
453 those like _GLOBAL_OFFSET_TABLE_ that are created specially
454 by the backends. Most symbols will have names pointing into
455 an ELF string table read from a file, or to objalloc memory. */
458 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
463 if (indx
== (bfd_size_type
) -1)
465 h
->dynstr_index
= indx
;
471 /* Mark a symbol dynamic. */
474 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
475 struct elf_link_hash_entry
*h
,
476 Elf_Internal_Sym
*sym
)
478 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
480 /* It may be called more than once on the same H. */
481 if(h
->dynamic
|| info
->relocatable
)
484 if ((info
->dynamic_data
485 && (h
->type
== STT_OBJECT
487 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
489 && h
->root
.type
== bfd_link_hash_new
490 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
494 /* Record an assignment to a symbol made by a linker script. We need
495 this in case some dynamic object refers to this symbol. */
498 bfd_elf_record_link_assignment (bfd
*output_bfd
,
499 struct bfd_link_info
*info
,
504 struct elf_link_hash_entry
*h
, *hv
;
505 struct elf_link_hash_table
*htab
;
506 const struct elf_backend_data
*bed
;
508 if (!is_elf_hash_table (info
->hash
))
511 htab
= elf_hash_table (info
);
512 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
516 switch (h
->root
.type
)
518 case bfd_link_hash_defined
:
519 case bfd_link_hash_defweak
:
520 case bfd_link_hash_common
:
522 case bfd_link_hash_undefweak
:
523 case bfd_link_hash_undefined
:
524 /* Since we're defining the symbol, don't let it seem to have not
525 been defined. record_dynamic_symbol and size_dynamic_sections
526 may depend on this. */
527 h
->root
.type
= bfd_link_hash_new
;
528 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
529 bfd_link_repair_undef_list (&htab
->root
);
531 case bfd_link_hash_new
:
532 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
535 case bfd_link_hash_indirect
:
536 /* We had a versioned symbol in a dynamic library. We make the
537 the versioned symbol point to this one. */
538 bed
= get_elf_backend_data (output_bfd
);
540 while (hv
->root
.type
== bfd_link_hash_indirect
541 || hv
->root
.type
== bfd_link_hash_warning
)
542 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
543 /* We don't need to update h->root.u since linker will set them
545 h
->root
.type
= bfd_link_hash_undefined
;
546 hv
->root
.type
= bfd_link_hash_indirect
;
547 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
548 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
550 case bfd_link_hash_warning
:
555 /* If this symbol is being provided by the linker script, and it is
556 currently defined by a dynamic object, but not by a regular
557 object, then mark it as undefined so that the generic linker will
558 force the correct value. */
562 h
->root
.type
= bfd_link_hash_undefined
;
564 /* If this symbol is not being provided by the linker script, and it is
565 currently defined by a dynamic object, but not by a regular object,
566 then clear out any version information because the symbol will not be
567 associated with the dynamic object any more. */
571 h
->verinfo
.verdef
= NULL
;
577 bed
= get_elf_backend_data (output_bfd
);
578 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
579 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
582 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
584 if (!info
->relocatable
586 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
587 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
593 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
596 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
599 /* If this is a weak defined symbol, and we know a corresponding
600 real symbol from the same dynamic object, make sure the real
601 symbol is also made into a dynamic symbol. */
602 if (h
->u
.weakdef
!= NULL
603 && h
->u
.weakdef
->dynindx
== -1)
605 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
613 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
614 success, and 2 on a failure caused by attempting to record a symbol
615 in a discarded section, eg. a discarded link-once section symbol. */
618 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
623 struct elf_link_local_dynamic_entry
*entry
;
624 struct elf_link_hash_table
*eht
;
625 struct elf_strtab_hash
*dynstr
;
626 unsigned long dynstr_index
;
628 Elf_External_Sym_Shndx eshndx
;
629 char esym
[sizeof (Elf64_External_Sym
)];
631 if (! is_elf_hash_table (info
->hash
))
634 /* See if the entry exists already. */
635 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
636 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
639 amt
= sizeof (*entry
);
640 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
644 /* Go find the symbol, so that we can find it's name. */
645 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
646 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
648 bfd_release (input_bfd
, entry
);
652 if (entry
->isym
.st_shndx
!= SHN_UNDEF
653 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
657 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
658 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
660 /* We can still bfd_release here as nothing has done another
661 bfd_alloc. We can't do this later in this function. */
662 bfd_release (input_bfd
, entry
);
667 name
= (bfd_elf_string_from_elf_section
668 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
669 entry
->isym
.st_name
));
671 dynstr
= elf_hash_table (info
)->dynstr
;
674 /* Create a strtab to hold the dynamic symbol names. */
675 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
680 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
681 if (dynstr_index
== (unsigned long) -1)
683 entry
->isym
.st_name
= dynstr_index
;
685 eht
= elf_hash_table (info
);
687 entry
->next
= eht
->dynlocal
;
688 eht
->dynlocal
= entry
;
689 entry
->input_bfd
= input_bfd
;
690 entry
->input_indx
= input_indx
;
693 /* Whatever binding the symbol had before, it's now local. */
695 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
697 /* The dynindx will be set at the end of size_dynamic_sections. */
702 /* Return the dynindex of a local dynamic symbol. */
705 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
709 struct elf_link_local_dynamic_entry
*e
;
711 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
712 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
717 /* This function is used to renumber the dynamic symbols, if some of
718 them are removed because they are marked as local. This is called
719 via elf_link_hash_traverse. */
722 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
725 size_t *count
= (size_t *) data
;
730 if (h
->dynindx
!= -1)
731 h
->dynindx
= ++(*count
);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
744 size_t *count
= (size_t *) data
;
746 if (!h
->forced_local
)
749 if (h
->dynindx
!= -1)
750 h
->dynindx
= ++(*count
);
755 /* Return true if the dynamic symbol for a given section should be
756 omitted when creating a shared library. */
758 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
759 struct bfd_link_info
*info
,
762 struct elf_link_hash_table
*htab
;
764 switch (elf_section_data (p
)->this_hdr
.sh_type
)
768 /* If sh_type is yet undecided, assume it could be
769 SHT_PROGBITS/SHT_NOBITS. */
771 htab
= elf_hash_table (info
);
772 if (p
== htab
->tls_sec
)
775 if (htab
->text_index_section
!= NULL
)
776 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
778 if (strcmp (p
->name
, ".got") == 0
779 || strcmp (p
->name
, ".got.plt") == 0
780 || strcmp (p
->name
, ".plt") == 0)
784 if (htab
->dynobj
!= NULL
785 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
786 && ip
->output_section
== p
)
791 /* There shouldn't be section relative relocations
792 against any other section. */
798 /* Assign dynsym indices. In a shared library we generate a section
799 symbol for each output section, which come first. Next come symbols
800 which have been forced to local binding. Then all of the back-end
801 allocated local dynamic syms, followed by the rest of the global
805 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
806 struct bfd_link_info
*info
,
807 unsigned long *section_sym_count
)
809 unsigned long dynsymcount
= 0;
811 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
813 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
815 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
816 if ((p
->flags
& SEC_EXCLUDE
) == 0
817 && (p
->flags
& SEC_ALLOC
) != 0
818 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
819 elf_section_data (p
)->dynindx
= ++dynsymcount
;
821 elf_section_data (p
)->dynindx
= 0;
823 *section_sym_count
= dynsymcount
;
825 elf_link_hash_traverse (elf_hash_table (info
),
826 elf_link_renumber_local_hash_table_dynsyms
,
829 if (elf_hash_table (info
)->dynlocal
)
831 struct elf_link_local_dynamic_entry
*p
;
832 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
833 p
->dynindx
= ++dynsymcount
;
836 elf_link_hash_traverse (elf_hash_table (info
),
837 elf_link_renumber_hash_table_dynsyms
,
840 /* There is an unused NULL entry at the head of the table which
841 we must account for in our count. Unless there weren't any
842 symbols, which means we'll have no table at all. */
843 if (dynsymcount
!= 0)
846 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
850 /* Merge st_other field. */
853 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
854 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
857 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
859 /* If st_other has a processor-specific meaning, specific
860 code might be needed here. We never merge the visibility
861 attribute with the one from a dynamic object. */
862 if (bed
->elf_backend_merge_symbol_attribute
)
863 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
866 /* If this symbol has default visibility and the user has requested
867 we not re-export it, then mark it as hidden. */
871 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
872 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
873 isym
->st_other
= (STV_HIDDEN
874 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
876 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
878 unsigned char hvis
, symvis
, other
, nvis
;
880 /* Only merge the visibility. Leave the remainder of the
881 st_other field to elf_backend_merge_symbol_attribute. */
882 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
884 /* Combine visibilities, using the most constraining one. */
885 hvis
= ELF_ST_VISIBILITY (h
->other
);
886 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
892 nvis
= hvis
< symvis
? hvis
: symvis
;
894 h
->other
= other
| nvis
;
898 /* This function is called when we want to merge a new symbol with an
899 existing symbol. It handles the various cases which arise when we
900 find a definition in a dynamic object, or when there is already a
901 definition in a dynamic object. The new symbol is described by
902 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
903 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
904 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
905 of an old common symbol. We set OVERRIDE if the old symbol is
906 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
907 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
908 to change. By OK to change, we mean that we shouldn't warn if the
909 type or size does change. */
912 _bfd_elf_merge_symbol (bfd
*abfd
,
913 struct bfd_link_info
*info
,
915 Elf_Internal_Sym
*sym
,
918 struct elf_link_hash_entry
**sym_hash
,
920 bfd_boolean
*pold_weak
,
921 unsigned int *pold_alignment
,
923 bfd_boolean
*override
,
924 bfd_boolean
*type_change_ok
,
925 bfd_boolean
*size_change_ok
)
927 asection
*sec
, *oldsec
;
928 struct elf_link_hash_entry
*h
;
929 struct elf_link_hash_entry
*hi
;
930 struct elf_link_hash_entry
*flip
;
933 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
934 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
935 const struct elf_backend_data
*bed
;
941 bind
= ELF_ST_BIND (sym
->st_info
);
943 if (! bfd_is_und_section (sec
))
944 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
946 h
= ((struct elf_link_hash_entry
*)
947 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
952 bed
= get_elf_backend_data (abfd
);
954 /* This code is for coping with dynamic objects, and is only useful
955 if we are doing an ELF link. */
956 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
959 /* For merging, we only care about real symbols. But we need to make
960 sure that indirect symbol dynamic flags are updated. */
962 while (h
->root
.type
== bfd_link_hash_indirect
963 || h
->root
.type
== bfd_link_hash_warning
)
964 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
966 /* We have to check it for every instance since the first few may be
967 references and not all compilers emit symbol type for undefined
969 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
971 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
972 respectively, is from a dynamic object. */
974 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
976 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
977 syms and defined syms in dynamic libraries respectively.
978 ref_dynamic on the other hand can be set for a symbol defined in
979 a dynamic library, and def_dynamic may not be set; When the
980 definition in a dynamic lib is overridden by a definition in the
981 executable use of the symbol in the dynamic lib becomes a
982 reference to the executable symbol. */
985 if (bfd_is_und_section (sec
))
987 if (bind
!= STB_WEAK
)
989 h
->ref_dynamic_nonweak
= 1;
990 hi
->ref_dynamic_nonweak
= 1;
1000 /* If we just created the symbol, mark it as being an ELF symbol.
1001 Other than that, there is nothing to do--there is no merge issue
1002 with a newly defined symbol--so we just return. */
1004 if (h
->root
.type
== bfd_link_hash_new
)
1010 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1013 switch (h
->root
.type
)
1020 case bfd_link_hash_undefined
:
1021 case bfd_link_hash_undefweak
:
1022 oldbfd
= h
->root
.u
.undef
.abfd
;
1026 case bfd_link_hash_defined
:
1027 case bfd_link_hash_defweak
:
1028 oldbfd
= h
->root
.u
.def
.section
->owner
;
1029 oldsec
= h
->root
.u
.def
.section
;
1032 case bfd_link_hash_common
:
1033 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1034 oldsec
= h
->root
.u
.c
.p
->section
;
1036 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1039 if (poldbfd
&& *poldbfd
== NULL
)
1042 /* Differentiate strong and weak symbols. */
1043 newweak
= bind
== STB_WEAK
;
1044 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1045 || h
->root
.type
== bfd_link_hash_undefweak
);
1047 *pold_weak
= oldweak
;
1049 /* In cases involving weak versioned symbols, we may wind up trying
1050 to merge a symbol with itself. Catch that here, to avoid the
1051 confusion that results if we try to override a symbol with
1052 itself. The additional tests catch cases like
1053 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1054 dynamic object, which we do want to handle here. */
1056 && (newweak
|| oldweak
)
1057 && ((abfd
->flags
& DYNAMIC
) == 0
1058 || !h
->def_regular
))
1063 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1064 else if (oldsec
!= NULL
)
1066 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1067 indices used by MIPS ELF. */
1068 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1071 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1072 respectively, appear to be a definition rather than reference. */
1074 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1076 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1077 && h
->root
.type
!= bfd_link_hash_undefweak
1078 && h
->root
.type
!= bfd_link_hash_common
);
1080 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1081 respectively, appear to be a function. */
1083 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1084 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1086 oldfunc
= (h
->type
!= STT_NOTYPE
1087 && bed
->is_function_type (h
->type
));
1089 /* When we try to create a default indirect symbol from the dynamic
1090 definition with the default version, we skip it if its type and
1091 the type of existing regular definition mismatch. We only do it
1092 if the existing regular definition won't be dynamic. */
1093 if (pold_alignment
== NULL
1095 && !info
->export_dynamic
1100 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1101 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1102 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1103 && h
->type
!= STT_NOTYPE
1104 && !(newfunc
&& oldfunc
))
1110 /* Plugin symbol type isn't currently set. Stop bogus errors. */
1111 if (oldbfd
!= NULL
&& (oldbfd
->flags
& BFD_PLUGIN
) != 0)
1112 *type_change_ok
= TRUE
;
1114 /* Check TLS symbol. We don't check undefined symbol introduced by
1116 else if (oldbfd
!= NULL
1117 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1118 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1121 bfd_boolean ntdef
, tdef
;
1122 asection
*ntsec
, *tsec
;
1124 if (h
->type
== STT_TLS
)
1144 (*_bfd_error_handler
)
1145 (_("%s: TLS definition in %B section %A "
1146 "mismatches non-TLS definition in %B section %A"),
1147 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1148 else if (!tdef
&& !ntdef
)
1149 (*_bfd_error_handler
)
1150 (_("%s: TLS reference in %B "
1151 "mismatches non-TLS reference in %B"),
1152 tbfd
, ntbfd
, h
->root
.root
.string
);
1154 (*_bfd_error_handler
)
1155 (_("%s: TLS definition in %B section %A "
1156 "mismatches non-TLS reference in %B"),
1157 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1159 (*_bfd_error_handler
)
1160 (_("%s: TLS reference in %B "
1161 "mismatches non-TLS definition in %B section %A"),
1162 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1164 bfd_set_error (bfd_error_bad_value
);
1168 /* If the old symbol has non-default visibility, we ignore the new
1169 definition from a dynamic object. */
1171 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1172 && !bfd_is_und_section (sec
))
1175 /* Make sure this symbol is dynamic. */
1177 hi
->ref_dynamic
= 1;
1178 /* A protected symbol has external availability. Make sure it is
1179 recorded as dynamic.
1181 FIXME: Should we check type and size for protected symbol? */
1182 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1183 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1188 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1191 /* If the new symbol with non-default visibility comes from a
1192 relocatable file and the old definition comes from a dynamic
1193 object, we remove the old definition. */
1194 if (hi
->root
.type
== bfd_link_hash_indirect
)
1196 /* Handle the case where the old dynamic definition is
1197 default versioned. We need to copy the symbol info from
1198 the symbol with default version to the normal one if it
1199 was referenced before. */
1202 hi
->root
.type
= h
->root
.type
;
1203 h
->root
.type
= bfd_link_hash_indirect
;
1204 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1206 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1207 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1209 /* If the new symbol is hidden or internal, completely undo
1210 any dynamic link state. */
1211 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1212 h
->forced_local
= 0;
1219 /* FIXME: Should we check type and size for protected symbol? */
1229 /* If the old symbol was undefined before, then it will still be
1230 on the undefs list. If the new symbol is undefined or
1231 common, we can't make it bfd_link_hash_new here, because new
1232 undefined or common symbols will be added to the undefs list
1233 by _bfd_generic_link_add_one_symbol. Symbols may not be
1234 added twice to the undefs list. Also, if the new symbol is
1235 undefweak then we don't want to lose the strong undef. */
1236 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1238 h
->root
.type
= bfd_link_hash_undefined
;
1239 h
->root
.u
.undef
.abfd
= abfd
;
1243 h
->root
.type
= bfd_link_hash_new
;
1244 h
->root
.u
.undef
.abfd
= NULL
;
1247 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1249 /* If the new symbol is hidden or internal, completely undo
1250 any dynamic link state. */
1251 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1252 h
->forced_local
= 0;
1258 /* FIXME: Should we check type and size for protected symbol? */
1264 /* If a new weak symbol definition comes from a regular file and the
1265 old symbol comes from a dynamic library, we treat the new one as
1266 strong. Similarly, an old weak symbol definition from a regular
1267 file is treated as strong when the new symbol comes from a dynamic
1268 library. Further, an old weak symbol from a dynamic library is
1269 treated as strong if the new symbol is from a dynamic library.
1270 This reflects the way glibc's ld.so works.
1272 Do this before setting *type_change_ok or *size_change_ok so that
1273 we warn properly when dynamic library symbols are overridden. */
1275 if (newdef
&& !newdyn
&& olddyn
)
1277 if (olddef
&& newdyn
)
1280 /* Allow changes between different types of function symbol. */
1281 if (newfunc
&& oldfunc
)
1282 *type_change_ok
= TRUE
;
1284 /* It's OK to change the type if either the existing symbol or the
1285 new symbol is weak. A type change is also OK if the old symbol
1286 is undefined and the new symbol is defined. */
1291 && h
->root
.type
== bfd_link_hash_undefined
))
1292 *type_change_ok
= TRUE
;
1294 /* It's OK to change the size if either the existing symbol or the
1295 new symbol is weak, or if the old symbol is undefined. */
1298 || h
->root
.type
== bfd_link_hash_undefined
)
1299 *size_change_ok
= TRUE
;
1301 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1302 symbol, respectively, appears to be a common symbol in a dynamic
1303 object. If a symbol appears in an uninitialized section, and is
1304 not weak, and is not a function, then it may be a common symbol
1305 which was resolved when the dynamic object was created. We want
1306 to treat such symbols specially, because they raise special
1307 considerations when setting the symbol size: if the symbol
1308 appears as a common symbol in a regular object, and the size in
1309 the regular object is larger, we must make sure that we use the
1310 larger size. This problematic case can always be avoided in C,
1311 but it must be handled correctly when using Fortran shared
1314 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1315 likewise for OLDDYNCOMMON and OLDDEF.
1317 Note that this test is just a heuristic, and that it is quite
1318 possible to have an uninitialized symbol in a shared object which
1319 is really a definition, rather than a common symbol. This could
1320 lead to some minor confusion when the symbol really is a common
1321 symbol in some regular object. However, I think it will be
1327 && (sec
->flags
& SEC_ALLOC
) != 0
1328 && (sec
->flags
& SEC_LOAD
) == 0
1331 newdyncommon
= TRUE
;
1333 newdyncommon
= FALSE
;
1337 && h
->root
.type
== bfd_link_hash_defined
1339 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1340 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1343 olddyncommon
= TRUE
;
1345 olddyncommon
= FALSE
;
1347 /* We now know everything about the old and new symbols. We ask the
1348 backend to check if we can merge them. */
1349 if (bed
->merge_symbol
!= NULL
)
1351 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1356 /* If both the old and the new symbols look like common symbols in a
1357 dynamic object, set the size of the symbol to the larger of the
1362 && sym
->st_size
!= h
->size
)
1364 /* Since we think we have two common symbols, issue a multiple
1365 common warning if desired. Note that we only warn if the
1366 size is different. If the size is the same, we simply let
1367 the old symbol override the new one as normally happens with
1368 symbols defined in dynamic objects. */
1370 if (! ((*info
->callbacks
->multiple_common
)
1371 (info
, &h
->root
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1374 if (sym
->st_size
> h
->size
)
1375 h
->size
= sym
->st_size
;
1377 *size_change_ok
= TRUE
;
1380 /* If we are looking at a dynamic object, and we have found a
1381 definition, we need to see if the symbol was already defined by
1382 some other object. If so, we want to use the existing
1383 definition, and we do not want to report a multiple symbol
1384 definition error; we do this by clobbering *PSEC to be
1385 bfd_und_section_ptr.
1387 We treat a common symbol as a definition if the symbol in the
1388 shared library is a function, since common symbols always
1389 represent variables; this can cause confusion in principle, but
1390 any such confusion would seem to indicate an erroneous program or
1391 shared library. We also permit a common symbol in a regular
1392 object to override a weak symbol in a shared object. */
1397 || (h
->root
.type
== bfd_link_hash_common
1398 && (newweak
|| newfunc
))))
1402 newdyncommon
= FALSE
;
1404 *psec
= sec
= bfd_und_section_ptr
;
1405 *size_change_ok
= TRUE
;
1407 /* If we get here when the old symbol is a common symbol, then
1408 we are explicitly letting it override a weak symbol or
1409 function in a dynamic object, and we don't want to warn about
1410 a type change. If the old symbol is a defined symbol, a type
1411 change warning may still be appropriate. */
1413 if (h
->root
.type
== bfd_link_hash_common
)
1414 *type_change_ok
= TRUE
;
1417 /* Handle the special case of an old common symbol merging with a
1418 new symbol which looks like a common symbol in a shared object.
1419 We change *PSEC and *PVALUE to make the new symbol look like a
1420 common symbol, and let _bfd_generic_link_add_one_symbol do the
1424 && h
->root
.type
== bfd_link_hash_common
)
1428 newdyncommon
= FALSE
;
1429 *pvalue
= sym
->st_size
;
1430 *psec
= sec
= bed
->common_section (oldsec
);
1431 *size_change_ok
= TRUE
;
1434 /* Skip weak definitions of symbols that are already defined. */
1435 if (newdef
&& olddef
&& newweak
)
1437 /* Don't skip new non-IR weak syms. */
1438 if (!(oldbfd
!= NULL
1439 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1440 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1443 /* Merge st_other. If the symbol already has a dynamic index,
1444 but visibility says it should not be visible, turn it into a
1446 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1447 if (h
->dynindx
!= -1)
1448 switch (ELF_ST_VISIBILITY (h
->other
))
1452 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1457 /* If the old symbol is from a dynamic object, and the new symbol is
1458 a definition which is not from a dynamic object, then the new
1459 symbol overrides the old symbol. Symbols from regular files
1460 always take precedence over symbols from dynamic objects, even if
1461 they are defined after the dynamic object in the link.
1463 As above, we again permit a common symbol in a regular object to
1464 override a definition in a shared object if the shared object
1465 symbol is a function or is weak. */
1470 || (bfd_is_com_section (sec
)
1471 && (oldweak
|| oldfunc
)))
1476 /* Change the hash table entry to undefined, and let
1477 _bfd_generic_link_add_one_symbol do the right thing with the
1480 h
->root
.type
= bfd_link_hash_undefined
;
1481 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1482 *size_change_ok
= TRUE
;
1485 olddyncommon
= FALSE
;
1487 /* We again permit a type change when a common symbol may be
1488 overriding a function. */
1490 if (bfd_is_com_section (sec
))
1494 /* If a common symbol overrides a function, make sure
1495 that it isn't defined dynamically nor has type
1498 h
->type
= STT_NOTYPE
;
1500 *type_change_ok
= TRUE
;
1503 if (hi
->root
.type
== bfd_link_hash_indirect
)
1506 /* This union may have been set to be non-NULL when this symbol
1507 was seen in a dynamic object. We must force the union to be
1508 NULL, so that it is correct for a regular symbol. */
1509 h
->verinfo
.vertree
= NULL
;
1512 /* Handle the special case of a new common symbol merging with an
1513 old symbol that looks like it might be a common symbol defined in
1514 a shared object. Note that we have already handled the case in
1515 which a new common symbol should simply override the definition
1516 in the shared library. */
1519 && bfd_is_com_section (sec
)
1522 /* It would be best if we could set the hash table entry to a
1523 common symbol, but we don't know what to use for the section
1524 or the alignment. */
1525 if (! ((*info
->callbacks
->multiple_common
)
1526 (info
, &h
->root
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1529 /* If the presumed common symbol in the dynamic object is
1530 larger, pretend that the new symbol has its size. */
1532 if (h
->size
> *pvalue
)
1535 /* We need to remember the alignment required by the symbol
1536 in the dynamic object. */
1537 BFD_ASSERT (pold_alignment
);
1538 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1541 olddyncommon
= FALSE
;
1543 h
->root
.type
= bfd_link_hash_undefined
;
1544 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1546 *size_change_ok
= TRUE
;
1547 *type_change_ok
= TRUE
;
1549 if (hi
->root
.type
== bfd_link_hash_indirect
)
1552 h
->verinfo
.vertree
= NULL
;
1557 /* Handle the case where we had a versioned symbol in a dynamic
1558 library and now find a definition in a normal object. In this
1559 case, we make the versioned symbol point to the normal one. */
1560 flip
->root
.type
= h
->root
.type
;
1561 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1562 h
->root
.type
= bfd_link_hash_indirect
;
1563 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1564 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1568 flip
->ref_dynamic
= 1;
1575 /* This function is called to create an indirect symbol from the
1576 default for the symbol with the default version if needed. The
1577 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1578 set DYNSYM if the new indirect symbol is dynamic. */
1581 _bfd_elf_add_default_symbol (bfd
*abfd
,
1582 struct bfd_link_info
*info
,
1583 struct elf_link_hash_entry
*h
,
1585 Elf_Internal_Sym
*sym
,
1589 bfd_boolean
*dynsym
)
1591 bfd_boolean type_change_ok
;
1592 bfd_boolean size_change_ok
;
1595 struct elf_link_hash_entry
*hi
;
1596 struct bfd_link_hash_entry
*bh
;
1597 const struct elf_backend_data
*bed
;
1598 bfd_boolean collect
;
1599 bfd_boolean dynamic
;
1600 bfd_boolean override
;
1602 size_t len
, shortlen
;
1605 /* If this symbol has a version, and it is the default version, we
1606 create an indirect symbol from the default name to the fully
1607 decorated name. This will cause external references which do not
1608 specify a version to be bound to this version of the symbol. */
1609 p
= strchr (name
, ELF_VER_CHR
);
1610 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1613 bed
= get_elf_backend_data (abfd
);
1614 collect
= bed
->collect
;
1615 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1617 shortlen
= p
- name
;
1618 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1619 if (shortname
== NULL
)
1621 memcpy (shortname
, name
, shortlen
);
1622 shortname
[shortlen
] = '\0';
1624 /* We are going to create a new symbol. Merge it with any existing
1625 symbol with this name. For the purposes of the merge, act as
1626 though we were defining the symbol we just defined, although we
1627 actually going to define an indirect symbol. */
1628 type_change_ok
= FALSE
;
1629 size_change_ok
= FALSE
;
1631 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1632 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1633 &type_change_ok
, &size_change_ok
))
1642 if (! (_bfd_generic_link_add_one_symbol
1643 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1644 0, name
, FALSE
, collect
, &bh
)))
1646 hi
= (struct elf_link_hash_entry
*) bh
;
1650 /* In this case the symbol named SHORTNAME is overriding the
1651 indirect symbol we want to add. We were planning on making
1652 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1653 is the name without a version. NAME is the fully versioned
1654 name, and it is the default version.
1656 Overriding means that we already saw a definition for the
1657 symbol SHORTNAME in a regular object, and it is overriding
1658 the symbol defined in the dynamic object.
1660 When this happens, we actually want to change NAME, the
1661 symbol we just added, to refer to SHORTNAME. This will cause
1662 references to NAME in the shared object to become references
1663 to SHORTNAME in the regular object. This is what we expect
1664 when we override a function in a shared object: that the
1665 references in the shared object will be mapped to the
1666 definition in the regular object. */
1668 while (hi
->root
.type
== bfd_link_hash_indirect
1669 || hi
->root
.type
== bfd_link_hash_warning
)
1670 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1672 h
->root
.type
= bfd_link_hash_indirect
;
1673 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1677 hi
->ref_dynamic
= 1;
1681 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1686 /* Now set HI to H, so that the following code will set the
1687 other fields correctly. */
1691 /* Check if HI is a warning symbol. */
1692 if (hi
->root
.type
== bfd_link_hash_warning
)
1693 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1695 /* If there is a duplicate definition somewhere, then HI may not
1696 point to an indirect symbol. We will have reported an error to
1697 the user in that case. */
1699 if (hi
->root
.type
== bfd_link_hash_indirect
)
1701 struct elf_link_hash_entry
*ht
;
1703 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1704 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1706 /* See if the new flags lead us to realize that the symbol must
1712 if (! info
->executable
1719 if (hi
->ref_regular
)
1725 /* We also need to define an indirection from the nondefault version
1729 len
= strlen (name
);
1730 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1731 if (shortname
== NULL
)
1733 memcpy (shortname
, name
, shortlen
);
1734 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1736 /* Once again, merge with any existing symbol. */
1737 type_change_ok
= FALSE
;
1738 size_change_ok
= FALSE
;
1740 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1741 &hi
, NULL
, NULL
, NULL
, &skip
, &override
,
1742 &type_change_ok
, &size_change_ok
))
1750 /* Here SHORTNAME is a versioned name, so we don't expect to see
1751 the type of override we do in the case above unless it is
1752 overridden by a versioned definition. */
1753 if (hi
->root
.type
!= bfd_link_hash_defined
1754 && hi
->root
.type
!= bfd_link_hash_defweak
)
1755 (*_bfd_error_handler
)
1756 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1762 if (! (_bfd_generic_link_add_one_symbol
1763 (info
, abfd
, shortname
, BSF_INDIRECT
,
1764 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1766 hi
= (struct elf_link_hash_entry
*) bh
;
1768 /* If there is a duplicate definition somewhere, then HI may not
1769 point to an indirect symbol. We will have reported an error
1770 to the user in that case. */
1772 if (hi
->root
.type
== bfd_link_hash_indirect
)
1774 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1776 /* See if the new flags lead us to realize that the symbol
1782 if (! info
->executable
1788 if (hi
->ref_regular
)
1798 /* This routine is used to export all defined symbols into the dynamic
1799 symbol table. It is called via elf_link_hash_traverse. */
1802 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1804 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1806 /* Ignore indirect symbols. These are added by the versioning code. */
1807 if (h
->root
.type
== bfd_link_hash_indirect
)
1810 /* Ignore this if we won't export it. */
1811 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1814 if (h
->dynindx
== -1
1815 && (h
->def_regular
|| h
->ref_regular
)
1816 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
1817 h
->root
.root
.string
))
1819 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1829 /* Look through the symbols which are defined in other shared
1830 libraries and referenced here. Update the list of version
1831 dependencies. This will be put into the .gnu.version_r section.
1832 This function is called via elf_link_hash_traverse. */
1835 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1838 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
1839 Elf_Internal_Verneed
*t
;
1840 Elf_Internal_Vernaux
*a
;
1843 /* We only care about symbols defined in shared objects with version
1848 || h
->verinfo
.verdef
== NULL
)
1851 /* See if we already know about this version. */
1852 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1856 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1859 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1860 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1866 /* This is a new version. Add it to tree we are building. */
1871 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1874 rinfo
->failed
= TRUE
;
1878 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1879 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1880 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1884 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1887 rinfo
->failed
= TRUE
;
1891 /* Note that we are copying a string pointer here, and testing it
1892 above. If bfd_elf_string_from_elf_section is ever changed to
1893 discard the string data when low in memory, this will have to be
1895 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1897 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1898 a
->vna_nextptr
= t
->vn_auxptr
;
1900 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1903 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1910 /* Figure out appropriate versions for all the symbols. We may not
1911 have the version number script until we have read all of the input
1912 files, so until that point we don't know which symbols should be
1913 local. This function is called via elf_link_hash_traverse. */
1916 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1918 struct elf_info_failed
*sinfo
;
1919 struct bfd_link_info
*info
;
1920 const struct elf_backend_data
*bed
;
1921 struct elf_info_failed eif
;
1925 sinfo
= (struct elf_info_failed
*) data
;
1928 /* Fix the symbol flags. */
1931 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1934 sinfo
->failed
= TRUE
;
1938 /* We only need version numbers for symbols defined in regular
1940 if (!h
->def_regular
)
1943 bed
= get_elf_backend_data (info
->output_bfd
);
1944 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1945 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1947 struct bfd_elf_version_tree
*t
;
1952 /* There are two consecutive ELF_VER_CHR characters if this is
1953 not a hidden symbol. */
1955 if (*p
== ELF_VER_CHR
)
1961 /* If there is no version string, we can just return out. */
1969 /* Look for the version. If we find it, it is no longer weak. */
1970 for (t
= sinfo
->info
->version_info
; t
!= NULL
; t
= t
->next
)
1972 if (strcmp (t
->name
, p
) == 0)
1976 struct bfd_elf_version_expr
*d
;
1978 len
= p
- h
->root
.root
.string
;
1979 alc
= (char *) bfd_malloc (len
);
1982 sinfo
->failed
= TRUE
;
1985 memcpy (alc
, h
->root
.root
.string
, len
- 1);
1986 alc
[len
- 1] = '\0';
1987 if (alc
[len
- 2] == ELF_VER_CHR
)
1988 alc
[len
- 2] = '\0';
1990 h
->verinfo
.vertree
= t
;
1994 if (t
->globals
.list
!= NULL
)
1995 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
1997 /* See if there is anything to force this symbol to
1999 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2001 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2004 && ! info
->export_dynamic
)
2005 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2013 /* If we are building an application, we need to create a
2014 version node for this version. */
2015 if (t
== NULL
&& info
->executable
)
2017 struct bfd_elf_version_tree
**pp
;
2020 /* If we aren't going to export this symbol, we don't need
2021 to worry about it. */
2022 if (h
->dynindx
== -1)
2026 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
, amt
);
2029 sinfo
->failed
= TRUE
;
2034 t
->name_indx
= (unsigned int) -1;
2038 /* Don't count anonymous version tag. */
2039 if (sinfo
->info
->version_info
!= NULL
2040 && sinfo
->info
->version_info
->vernum
== 0)
2042 for (pp
= &sinfo
->info
->version_info
;
2046 t
->vernum
= version_index
;
2050 h
->verinfo
.vertree
= t
;
2054 /* We could not find the version for a symbol when
2055 generating a shared archive. Return an error. */
2056 (*_bfd_error_handler
)
2057 (_("%B: version node not found for symbol %s"),
2058 info
->output_bfd
, h
->root
.root
.string
);
2059 bfd_set_error (bfd_error_bad_value
);
2060 sinfo
->failed
= TRUE
;
2068 /* If we don't have a version for this symbol, see if we can find
2070 if (h
->verinfo
.vertree
== NULL
&& sinfo
->info
->version_info
!= NULL
)
2075 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2076 h
->root
.root
.string
, &hide
);
2077 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2078 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2084 /* Read and swap the relocs from the section indicated by SHDR. This
2085 may be either a REL or a RELA section. The relocations are
2086 translated into RELA relocations and stored in INTERNAL_RELOCS,
2087 which should have already been allocated to contain enough space.
2088 The EXTERNAL_RELOCS are a buffer where the external form of the
2089 relocations should be stored.
2091 Returns FALSE if something goes wrong. */
2094 elf_link_read_relocs_from_section (bfd
*abfd
,
2096 Elf_Internal_Shdr
*shdr
,
2097 void *external_relocs
,
2098 Elf_Internal_Rela
*internal_relocs
)
2100 const struct elf_backend_data
*bed
;
2101 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2102 const bfd_byte
*erela
;
2103 const bfd_byte
*erelaend
;
2104 Elf_Internal_Rela
*irela
;
2105 Elf_Internal_Shdr
*symtab_hdr
;
2108 /* Position ourselves at the start of the section. */
2109 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2112 /* Read the relocations. */
2113 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2116 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2117 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2119 bed
= get_elf_backend_data (abfd
);
2121 /* Convert the external relocations to the internal format. */
2122 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2123 swap_in
= bed
->s
->swap_reloc_in
;
2124 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2125 swap_in
= bed
->s
->swap_reloca_in
;
2128 bfd_set_error (bfd_error_wrong_format
);
2132 erela
= (const bfd_byte
*) external_relocs
;
2133 erelaend
= erela
+ shdr
->sh_size
;
2134 irela
= internal_relocs
;
2135 while (erela
< erelaend
)
2139 (*swap_in
) (abfd
, erela
, irela
);
2140 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2141 if (bed
->s
->arch_size
== 64)
2145 if ((size_t) r_symndx
>= nsyms
)
2147 (*_bfd_error_handler
)
2148 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2149 " for offset 0x%lx in section `%A'"),
2151 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2152 bfd_set_error (bfd_error_bad_value
);
2156 else if (r_symndx
!= STN_UNDEF
)
2158 (*_bfd_error_handler
)
2159 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2160 " when the object file has no symbol table"),
2162 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2163 bfd_set_error (bfd_error_bad_value
);
2166 irela
+= bed
->s
->int_rels_per_ext_rel
;
2167 erela
+= shdr
->sh_entsize
;
2173 /* Read and swap the relocs for a section O. They may have been
2174 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2175 not NULL, they are used as buffers to read into. They are known to
2176 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2177 the return value is allocated using either malloc or bfd_alloc,
2178 according to the KEEP_MEMORY argument. If O has two relocation
2179 sections (both REL and RELA relocations), then the REL_HDR
2180 relocations will appear first in INTERNAL_RELOCS, followed by the
2181 RELA_HDR relocations. */
2184 _bfd_elf_link_read_relocs (bfd
*abfd
,
2186 void *external_relocs
,
2187 Elf_Internal_Rela
*internal_relocs
,
2188 bfd_boolean keep_memory
)
2190 void *alloc1
= NULL
;
2191 Elf_Internal_Rela
*alloc2
= NULL
;
2192 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2193 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2194 Elf_Internal_Rela
*internal_rela_relocs
;
2196 if (esdo
->relocs
!= NULL
)
2197 return esdo
->relocs
;
2199 if (o
->reloc_count
== 0)
2202 if (internal_relocs
== NULL
)
2206 size
= o
->reloc_count
;
2207 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2209 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2211 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2212 if (internal_relocs
== NULL
)
2216 if (external_relocs
== NULL
)
2218 bfd_size_type size
= 0;
2221 size
+= esdo
->rel
.hdr
->sh_size
;
2223 size
+= esdo
->rela
.hdr
->sh_size
;
2225 alloc1
= bfd_malloc (size
);
2228 external_relocs
= alloc1
;
2231 internal_rela_relocs
= internal_relocs
;
2234 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2238 external_relocs
= (((bfd_byte
*) external_relocs
)
2239 + esdo
->rel
.hdr
->sh_size
);
2240 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2241 * bed
->s
->int_rels_per_ext_rel
);
2245 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2247 internal_rela_relocs
)))
2250 /* Cache the results for next time, if we can. */
2252 esdo
->relocs
= internal_relocs
;
2257 /* Don't free alloc2, since if it was allocated we are passing it
2258 back (under the name of internal_relocs). */
2260 return internal_relocs
;
2268 bfd_release (abfd
, alloc2
);
2275 /* Compute the size of, and allocate space for, REL_HDR which is the
2276 section header for a section containing relocations for O. */
2279 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2280 struct bfd_elf_section_reloc_data
*reldata
)
2282 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2284 /* That allows us to calculate the size of the section. */
2285 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2287 /* The contents field must last into write_object_contents, so we
2288 allocate it with bfd_alloc rather than malloc. Also since we
2289 cannot be sure that the contents will actually be filled in,
2290 we zero the allocated space. */
2291 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2292 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2295 if (reldata
->hashes
== NULL
&& reldata
->count
)
2297 struct elf_link_hash_entry
**p
;
2299 p
= (struct elf_link_hash_entry
**)
2300 bfd_zmalloc (reldata
->count
* sizeof (struct elf_link_hash_entry
*));
2304 reldata
->hashes
= p
;
2310 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2311 originated from the section given by INPUT_REL_HDR) to the
2315 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2316 asection
*input_section
,
2317 Elf_Internal_Shdr
*input_rel_hdr
,
2318 Elf_Internal_Rela
*internal_relocs
,
2319 struct elf_link_hash_entry
**rel_hash
2322 Elf_Internal_Rela
*irela
;
2323 Elf_Internal_Rela
*irelaend
;
2325 struct bfd_elf_section_reloc_data
*output_reldata
;
2326 asection
*output_section
;
2327 const struct elf_backend_data
*bed
;
2328 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2329 struct bfd_elf_section_data
*esdo
;
2331 output_section
= input_section
->output_section
;
2333 bed
= get_elf_backend_data (output_bfd
);
2334 esdo
= elf_section_data (output_section
);
2335 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2337 output_reldata
= &esdo
->rel
;
2338 swap_out
= bed
->s
->swap_reloc_out
;
2340 else if (esdo
->rela
.hdr
2341 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2343 output_reldata
= &esdo
->rela
;
2344 swap_out
= bed
->s
->swap_reloca_out
;
2348 (*_bfd_error_handler
)
2349 (_("%B: relocation size mismatch in %B section %A"),
2350 output_bfd
, input_section
->owner
, input_section
);
2351 bfd_set_error (bfd_error_wrong_format
);
2355 erel
= output_reldata
->hdr
->contents
;
2356 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2357 irela
= internal_relocs
;
2358 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2359 * bed
->s
->int_rels_per_ext_rel
);
2360 while (irela
< irelaend
)
2362 (*swap_out
) (output_bfd
, irela
, erel
);
2363 irela
+= bed
->s
->int_rels_per_ext_rel
;
2364 erel
+= input_rel_hdr
->sh_entsize
;
2367 /* Bump the counter, so that we know where to add the next set of
2369 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2374 /* Make weak undefined symbols in PIE dynamic. */
2377 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2378 struct elf_link_hash_entry
*h
)
2382 && h
->root
.type
== bfd_link_hash_undefweak
)
2383 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2388 /* Fix up the flags for a symbol. This handles various cases which
2389 can only be fixed after all the input files are seen. This is
2390 currently called by both adjust_dynamic_symbol and
2391 assign_sym_version, which is unnecessary but perhaps more robust in
2392 the face of future changes. */
2395 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2396 struct elf_info_failed
*eif
)
2398 const struct elf_backend_data
*bed
;
2400 /* If this symbol was mentioned in a non-ELF file, try to set
2401 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2402 permit a non-ELF file to correctly refer to a symbol defined in
2403 an ELF dynamic object. */
2406 while (h
->root
.type
== bfd_link_hash_indirect
)
2407 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2409 if (h
->root
.type
!= bfd_link_hash_defined
2410 && h
->root
.type
!= bfd_link_hash_defweak
)
2413 h
->ref_regular_nonweak
= 1;
2417 if (h
->root
.u
.def
.section
->owner
!= NULL
2418 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2419 == bfd_target_elf_flavour
))
2422 h
->ref_regular_nonweak
= 1;
2428 if (h
->dynindx
== -1
2432 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2441 /* Unfortunately, NON_ELF is only correct if the symbol
2442 was first seen in a non-ELF file. Fortunately, if the symbol
2443 was first seen in an ELF file, we're probably OK unless the
2444 symbol was defined in a non-ELF file. Catch that case here.
2445 FIXME: We're still in trouble if the symbol was first seen in
2446 a dynamic object, and then later in a non-ELF regular object. */
2447 if ((h
->root
.type
== bfd_link_hash_defined
2448 || h
->root
.type
== bfd_link_hash_defweak
)
2450 && (h
->root
.u
.def
.section
->owner
!= NULL
2451 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2452 != bfd_target_elf_flavour
)
2453 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2454 && !h
->def_dynamic
)))
2458 /* Backend specific symbol fixup. */
2459 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2460 if (bed
->elf_backend_fixup_symbol
2461 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2464 /* If this is a final link, and the symbol was defined as a common
2465 symbol in a regular object file, and there was no definition in
2466 any dynamic object, then the linker will have allocated space for
2467 the symbol in a common section but the DEF_REGULAR
2468 flag will not have been set. */
2469 if (h
->root
.type
== bfd_link_hash_defined
2473 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2476 /* If -Bsymbolic was used (which means to bind references to global
2477 symbols to the definition within the shared object), and this
2478 symbol was defined in a regular object, then it actually doesn't
2479 need a PLT entry. Likewise, if the symbol has non-default
2480 visibility. If the symbol has hidden or internal visibility, we
2481 will force it local. */
2483 && eif
->info
->shared
2484 && is_elf_hash_table (eif
->info
->hash
)
2485 && (SYMBOLIC_BIND (eif
->info
, h
)
2486 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2489 bfd_boolean force_local
;
2491 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2492 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2493 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2496 /* If a weak undefined symbol has non-default visibility, we also
2497 hide it from the dynamic linker. */
2498 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2499 && h
->root
.type
== bfd_link_hash_undefweak
)
2500 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2502 /* If this is a weak defined symbol in a dynamic object, and we know
2503 the real definition in the dynamic object, copy interesting flags
2504 over to the real definition. */
2505 if (h
->u
.weakdef
!= NULL
)
2507 /* If the real definition is defined by a regular object file,
2508 don't do anything special. See the longer description in
2509 _bfd_elf_adjust_dynamic_symbol, below. */
2510 if (h
->u
.weakdef
->def_regular
)
2511 h
->u
.weakdef
= NULL
;
2514 struct elf_link_hash_entry
*weakdef
= h
->u
.weakdef
;
2516 while (h
->root
.type
== bfd_link_hash_indirect
)
2517 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2519 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2520 || h
->root
.type
== bfd_link_hash_defweak
);
2521 BFD_ASSERT (weakdef
->def_dynamic
);
2522 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2523 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2524 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2531 /* Make the backend pick a good value for a dynamic symbol. This is
2532 called via elf_link_hash_traverse, and also calls itself
2536 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2538 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2540 const struct elf_backend_data
*bed
;
2542 if (! is_elf_hash_table (eif
->info
->hash
))
2545 /* Ignore indirect symbols. These are added by the versioning code. */
2546 if (h
->root
.type
== bfd_link_hash_indirect
)
2549 /* Fix the symbol flags. */
2550 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2553 /* If this symbol does not require a PLT entry, and it is not
2554 defined by a dynamic object, or is not referenced by a regular
2555 object, ignore it. We do have to handle a weak defined symbol,
2556 even if no regular object refers to it, if we decided to add it
2557 to the dynamic symbol table. FIXME: Do we normally need to worry
2558 about symbols which are defined by one dynamic object and
2559 referenced by another one? */
2561 && h
->type
!= STT_GNU_IFUNC
2565 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2567 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2571 /* If we've already adjusted this symbol, don't do it again. This
2572 can happen via a recursive call. */
2573 if (h
->dynamic_adjusted
)
2576 /* Don't look at this symbol again. Note that we must set this
2577 after checking the above conditions, because we may look at a
2578 symbol once, decide not to do anything, and then get called
2579 recursively later after REF_REGULAR is set below. */
2580 h
->dynamic_adjusted
= 1;
2582 /* If this is a weak definition, and we know a real definition, and
2583 the real symbol is not itself defined by a regular object file,
2584 then get a good value for the real definition. We handle the
2585 real symbol first, for the convenience of the backend routine.
2587 Note that there is a confusing case here. If the real definition
2588 is defined by a regular object file, we don't get the real symbol
2589 from the dynamic object, but we do get the weak symbol. If the
2590 processor backend uses a COPY reloc, then if some routine in the
2591 dynamic object changes the real symbol, we will not see that
2592 change in the corresponding weak symbol. This is the way other
2593 ELF linkers work as well, and seems to be a result of the shared
2596 I will clarify this issue. Most SVR4 shared libraries define the
2597 variable _timezone and define timezone as a weak synonym. The
2598 tzset call changes _timezone. If you write
2599 extern int timezone;
2601 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2602 you might expect that, since timezone is a synonym for _timezone,
2603 the same number will print both times. However, if the processor
2604 backend uses a COPY reloc, then actually timezone will be copied
2605 into your process image, and, since you define _timezone
2606 yourself, _timezone will not. Thus timezone and _timezone will
2607 wind up at different memory locations. The tzset call will set
2608 _timezone, leaving timezone unchanged. */
2610 if (h
->u
.weakdef
!= NULL
)
2612 /* If we get to this point, there is an implicit reference to
2613 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2614 h
->u
.weakdef
->ref_regular
= 1;
2616 /* Ensure that the backend adjust_dynamic_symbol function sees
2617 H->U.WEAKDEF before H by recursively calling ourselves. */
2618 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2622 /* If a symbol has no type and no size and does not require a PLT
2623 entry, then we are probably about to do the wrong thing here: we
2624 are probably going to create a COPY reloc for an empty object.
2625 This case can arise when a shared object is built with assembly
2626 code, and the assembly code fails to set the symbol type. */
2628 && h
->type
== STT_NOTYPE
2630 (*_bfd_error_handler
)
2631 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2632 h
->root
.root
.string
);
2634 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2635 bed
= get_elf_backend_data (dynobj
);
2637 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2646 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2650 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2653 unsigned int power_of_two
;
2655 asection
*sec
= h
->root
.u
.def
.section
;
2657 /* The section aligment of definition is the maximum alignment
2658 requirement of symbols defined in the section. Since we don't
2659 know the symbol alignment requirement, we start with the
2660 maximum alignment and check low bits of the symbol address
2661 for the minimum alignment. */
2662 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2663 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2664 while ((h
->root
.u
.def
.value
& mask
) != 0)
2670 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2673 /* Adjust the section alignment if needed. */
2674 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2679 /* We make sure that the symbol will be aligned properly. */
2680 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2682 /* Define the symbol as being at this point in DYNBSS. */
2683 h
->root
.u
.def
.section
= dynbss
;
2684 h
->root
.u
.def
.value
= dynbss
->size
;
2686 /* Increment the size of DYNBSS to make room for the symbol. */
2687 dynbss
->size
+= h
->size
;
2692 /* Adjust all external symbols pointing into SEC_MERGE sections
2693 to reflect the object merging within the sections. */
2696 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2700 if ((h
->root
.type
== bfd_link_hash_defined
2701 || h
->root
.type
== bfd_link_hash_defweak
)
2702 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2703 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
2705 bfd
*output_bfd
= (bfd
*) data
;
2707 h
->root
.u
.def
.value
=
2708 _bfd_merged_section_offset (output_bfd
,
2709 &h
->root
.u
.def
.section
,
2710 elf_section_data (sec
)->sec_info
,
2711 h
->root
.u
.def
.value
);
2717 /* Returns false if the symbol referred to by H should be considered
2718 to resolve local to the current module, and true if it should be
2719 considered to bind dynamically. */
2722 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2723 struct bfd_link_info
*info
,
2724 bfd_boolean not_local_protected
)
2726 bfd_boolean binding_stays_local_p
;
2727 const struct elf_backend_data
*bed
;
2728 struct elf_link_hash_table
*hash_table
;
2733 while (h
->root
.type
== bfd_link_hash_indirect
2734 || h
->root
.type
== bfd_link_hash_warning
)
2735 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2737 /* If it was forced local, then clearly it's not dynamic. */
2738 if (h
->dynindx
== -1)
2740 if (h
->forced_local
)
2743 /* Identify the cases where name binding rules say that a
2744 visible symbol resolves locally. */
2745 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2747 switch (ELF_ST_VISIBILITY (h
->other
))
2754 hash_table
= elf_hash_table (info
);
2755 if (!is_elf_hash_table (hash_table
))
2758 bed
= get_elf_backend_data (hash_table
->dynobj
);
2760 /* Proper resolution for function pointer equality may require
2761 that these symbols perhaps be resolved dynamically, even though
2762 we should be resolving them to the current module. */
2763 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
2764 binding_stays_local_p
= TRUE
;
2771 /* If it isn't defined locally, then clearly it's dynamic. */
2772 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2775 /* Otherwise, the symbol is dynamic if binding rules don't tell
2776 us that it remains local. */
2777 return !binding_stays_local_p
;
2780 /* Return true if the symbol referred to by H should be considered
2781 to resolve local to the current module, and false otherwise. Differs
2782 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2783 undefined symbols. The two functions are virtually identical except
2784 for the place where forced_local and dynindx == -1 are tested. If
2785 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2786 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2787 the symbol is local only for defined symbols.
2788 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2789 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2790 treatment of undefined weak symbols. For those that do not make
2791 undefined weak symbols dynamic, both functions may return false. */
2794 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2795 struct bfd_link_info
*info
,
2796 bfd_boolean local_protected
)
2798 const struct elf_backend_data
*bed
;
2799 struct elf_link_hash_table
*hash_table
;
2801 /* If it's a local sym, of course we resolve locally. */
2805 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2806 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2807 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2810 /* Common symbols that become definitions don't get the DEF_REGULAR
2811 flag set, so test it first, and don't bail out. */
2812 if (ELF_COMMON_DEF_P (h
))
2814 /* If we don't have a definition in a regular file, then we can't
2815 resolve locally. The sym is either undefined or dynamic. */
2816 else if (!h
->def_regular
)
2819 /* Forced local symbols resolve locally. */
2820 if (h
->forced_local
)
2823 /* As do non-dynamic symbols. */
2824 if (h
->dynindx
== -1)
2827 /* At this point, we know the symbol is defined and dynamic. In an
2828 executable it must resolve locally, likewise when building symbolic
2829 shared libraries. */
2830 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2833 /* Now deal with defined dynamic symbols in shared libraries. Ones
2834 with default visibility might not resolve locally. */
2835 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2838 hash_table
= elf_hash_table (info
);
2839 if (!is_elf_hash_table (hash_table
))
2842 bed
= get_elf_backend_data (hash_table
->dynobj
);
2844 /* STV_PROTECTED non-function symbols are local. */
2845 if (!bed
->is_function_type (h
->type
))
2848 /* Function pointer equality tests may require that STV_PROTECTED
2849 symbols be treated as dynamic symbols. If the address of a
2850 function not defined in an executable is set to that function's
2851 plt entry in the executable, then the address of the function in
2852 a shared library must also be the plt entry in the executable. */
2853 return local_protected
;
2856 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2857 aligned. Returns the first TLS output section. */
2859 struct bfd_section
*
2860 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2862 struct bfd_section
*sec
, *tls
;
2863 unsigned int align
= 0;
2865 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2866 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2870 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2871 if (sec
->alignment_power
> align
)
2872 align
= sec
->alignment_power
;
2874 elf_hash_table (info
)->tls_sec
= tls
;
2876 /* Ensure the alignment of the first section is the largest alignment,
2877 so that the tls segment starts aligned. */
2879 tls
->alignment_power
= align
;
2884 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2886 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2887 Elf_Internal_Sym
*sym
)
2889 const struct elf_backend_data
*bed
;
2891 /* Local symbols do not count, but target specific ones might. */
2892 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2893 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2896 bed
= get_elf_backend_data (abfd
);
2897 /* Function symbols do not count. */
2898 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2901 /* If the section is undefined, then so is the symbol. */
2902 if (sym
->st_shndx
== SHN_UNDEF
)
2905 /* If the symbol is defined in the common section, then
2906 it is a common definition and so does not count. */
2907 if (bed
->common_definition (sym
))
2910 /* If the symbol is in a target specific section then we
2911 must rely upon the backend to tell us what it is. */
2912 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2913 /* FIXME - this function is not coded yet:
2915 return _bfd_is_global_symbol_definition (abfd, sym);
2917 Instead for now assume that the definition is not global,
2918 Even if this is wrong, at least the linker will behave
2919 in the same way that it used to do. */
2925 /* Search the symbol table of the archive element of the archive ABFD
2926 whose archive map contains a mention of SYMDEF, and determine if
2927 the symbol is defined in this element. */
2929 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2931 Elf_Internal_Shdr
* hdr
;
2932 bfd_size_type symcount
;
2933 bfd_size_type extsymcount
;
2934 bfd_size_type extsymoff
;
2935 Elf_Internal_Sym
*isymbuf
;
2936 Elf_Internal_Sym
*isym
;
2937 Elf_Internal_Sym
*isymend
;
2940 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2944 if (! bfd_check_format (abfd
, bfd_object
))
2947 /* If we have already included the element containing this symbol in the
2948 link then we do not need to include it again. Just claim that any symbol
2949 it contains is not a definition, so that our caller will not decide to
2950 (re)include this element. */
2951 if (abfd
->archive_pass
)
2954 /* Select the appropriate symbol table. */
2955 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2956 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2958 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2960 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2962 /* The sh_info field of the symtab header tells us where the
2963 external symbols start. We don't care about the local symbols. */
2964 if (elf_bad_symtab (abfd
))
2966 extsymcount
= symcount
;
2971 extsymcount
= symcount
- hdr
->sh_info
;
2972 extsymoff
= hdr
->sh_info
;
2975 if (extsymcount
== 0)
2978 /* Read in the symbol table. */
2979 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2981 if (isymbuf
== NULL
)
2984 /* Scan the symbol table looking for SYMDEF. */
2986 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2990 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2995 if (strcmp (name
, symdef
->name
) == 0)
2997 result
= is_global_data_symbol_definition (abfd
, isym
);
3007 /* Add an entry to the .dynamic table. */
3010 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3014 struct elf_link_hash_table
*hash_table
;
3015 const struct elf_backend_data
*bed
;
3017 bfd_size_type newsize
;
3018 bfd_byte
*newcontents
;
3019 Elf_Internal_Dyn dyn
;
3021 hash_table
= elf_hash_table (info
);
3022 if (! is_elf_hash_table (hash_table
))
3025 bed
= get_elf_backend_data (hash_table
->dynobj
);
3026 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3027 BFD_ASSERT (s
!= NULL
);
3029 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3030 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3031 if (newcontents
== NULL
)
3035 dyn
.d_un
.d_val
= val
;
3036 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3039 s
->contents
= newcontents
;
3044 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3045 otherwise just check whether one already exists. Returns -1 on error,
3046 1 if a DT_NEEDED tag already exists, and 0 on success. */
3049 elf_add_dt_needed_tag (bfd
*abfd
,
3050 struct bfd_link_info
*info
,
3054 struct elf_link_hash_table
*hash_table
;
3055 bfd_size_type strindex
;
3057 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3060 hash_table
= elf_hash_table (info
);
3061 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3062 if (strindex
== (bfd_size_type
) -1)
3065 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3068 const struct elf_backend_data
*bed
;
3071 bed
= get_elf_backend_data (hash_table
->dynobj
);
3072 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3074 for (extdyn
= sdyn
->contents
;
3075 extdyn
< sdyn
->contents
+ sdyn
->size
;
3076 extdyn
+= bed
->s
->sizeof_dyn
)
3078 Elf_Internal_Dyn dyn
;
3080 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3081 if (dyn
.d_tag
== DT_NEEDED
3082 && dyn
.d_un
.d_val
== strindex
)
3084 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3092 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3095 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3099 /* We were just checking for existence of the tag. */
3100 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3106 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3108 for (; needed
!= NULL
; needed
= needed
->next
)
3109 if (strcmp (soname
, needed
->name
) == 0)
3115 /* Sort symbol by value, section, and size. */
3117 elf_sort_symbol (const void *arg1
, const void *arg2
)
3119 const struct elf_link_hash_entry
*h1
;
3120 const struct elf_link_hash_entry
*h2
;
3121 bfd_signed_vma vdiff
;
3123 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3124 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3125 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3127 return vdiff
> 0 ? 1 : -1;
3130 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3132 return sdiff
> 0 ? 1 : -1;
3134 vdiff
= h1
->size
- h2
->size
;
3135 return vdiff
== 0 ? 0 : vdiff
> 0 ? 1 : -1;
3138 /* This function is used to adjust offsets into .dynstr for
3139 dynamic symbols. This is called via elf_link_hash_traverse. */
3142 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3144 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3146 if (h
->dynindx
!= -1)
3147 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3151 /* Assign string offsets in .dynstr, update all structures referencing
3155 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3157 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3158 struct elf_link_local_dynamic_entry
*entry
;
3159 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3160 bfd
*dynobj
= hash_table
->dynobj
;
3163 const struct elf_backend_data
*bed
;
3166 _bfd_elf_strtab_finalize (dynstr
);
3167 size
= _bfd_elf_strtab_size (dynstr
);
3169 bed
= get_elf_backend_data (dynobj
);
3170 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3171 BFD_ASSERT (sdyn
!= NULL
);
3173 /* Update all .dynamic entries referencing .dynstr strings. */
3174 for (extdyn
= sdyn
->contents
;
3175 extdyn
< sdyn
->contents
+ sdyn
->size
;
3176 extdyn
+= bed
->s
->sizeof_dyn
)
3178 Elf_Internal_Dyn dyn
;
3180 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3184 dyn
.d_un
.d_val
= size
;
3194 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3199 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3202 /* Now update local dynamic symbols. */
3203 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3204 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3205 entry
->isym
.st_name
);
3207 /* And the rest of dynamic symbols. */
3208 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3210 /* Adjust version definitions. */
3211 if (elf_tdata (output_bfd
)->cverdefs
)
3216 Elf_Internal_Verdef def
;
3217 Elf_Internal_Verdaux defaux
;
3219 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3223 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3225 p
+= sizeof (Elf_External_Verdef
);
3226 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3228 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3230 _bfd_elf_swap_verdaux_in (output_bfd
,
3231 (Elf_External_Verdaux
*) p
, &defaux
);
3232 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3234 _bfd_elf_swap_verdaux_out (output_bfd
,
3235 &defaux
, (Elf_External_Verdaux
*) p
);
3236 p
+= sizeof (Elf_External_Verdaux
);
3239 while (def
.vd_next
);
3242 /* Adjust version references. */
3243 if (elf_tdata (output_bfd
)->verref
)
3248 Elf_Internal_Verneed need
;
3249 Elf_Internal_Vernaux needaux
;
3251 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3255 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3257 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3258 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3259 (Elf_External_Verneed
*) p
);
3260 p
+= sizeof (Elf_External_Verneed
);
3261 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3263 _bfd_elf_swap_vernaux_in (output_bfd
,
3264 (Elf_External_Vernaux
*) p
, &needaux
);
3265 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3267 _bfd_elf_swap_vernaux_out (output_bfd
,
3269 (Elf_External_Vernaux
*) p
);
3270 p
+= sizeof (Elf_External_Vernaux
);
3273 while (need
.vn_next
);
3279 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3280 The default is to only match when the INPUT and OUTPUT are exactly
3284 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3285 const bfd_target
*output
)
3287 return input
== output
;
3290 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3291 This version is used when different targets for the same architecture
3292 are virtually identical. */
3295 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3296 const bfd_target
*output
)
3298 const struct elf_backend_data
*obed
, *ibed
;
3300 if (input
== output
)
3303 ibed
= xvec_get_elf_backend_data (input
);
3304 obed
= xvec_get_elf_backend_data (output
);
3306 if (ibed
->arch
!= obed
->arch
)
3309 /* If both backends are using this function, deem them compatible. */
3310 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3313 /* Add symbols from an ELF object file to the linker hash table. */
3316 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3318 Elf_Internal_Ehdr
*ehdr
;
3319 Elf_Internal_Shdr
*hdr
;
3320 bfd_size_type symcount
;
3321 bfd_size_type extsymcount
;
3322 bfd_size_type extsymoff
;
3323 struct elf_link_hash_entry
**sym_hash
;
3324 bfd_boolean dynamic
;
3325 Elf_External_Versym
*extversym
= NULL
;
3326 Elf_External_Versym
*ever
;
3327 struct elf_link_hash_entry
*weaks
;
3328 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3329 bfd_size_type nondeflt_vers_cnt
= 0;
3330 Elf_Internal_Sym
*isymbuf
= NULL
;
3331 Elf_Internal_Sym
*isym
;
3332 Elf_Internal_Sym
*isymend
;
3333 const struct elf_backend_data
*bed
;
3334 bfd_boolean add_needed
;
3335 struct elf_link_hash_table
*htab
;
3337 void *alloc_mark
= NULL
;
3338 struct bfd_hash_entry
**old_table
= NULL
;
3339 unsigned int old_size
= 0;
3340 unsigned int old_count
= 0;
3341 void *old_tab
= NULL
;
3344 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3345 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3346 long old_dynsymcount
= 0;
3347 bfd_size_type old_dynstr_size
= 0;
3349 size_t hashsize
= 0;
3351 htab
= elf_hash_table (info
);
3352 bed
= get_elf_backend_data (abfd
);
3354 if ((abfd
->flags
& DYNAMIC
) == 0)
3360 /* You can't use -r against a dynamic object. Also, there's no
3361 hope of using a dynamic object which does not exactly match
3362 the format of the output file. */
3363 if (info
->relocatable
3364 || !is_elf_hash_table (htab
)
3365 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3367 if (info
->relocatable
)
3368 bfd_set_error (bfd_error_invalid_operation
);
3370 bfd_set_error (bfd_error_wrong_format
);
3375 ehdr
= elf_elfheader (abfd
);
3376 if (info
->warn_alternate_em
3377 && bed
->elf_machine_code
!= ehdr
->e_machine
3378 && ((bed
->elf_machine_alt1
!= 0
3379 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3380 || (bed
->elf_machine_alt2
!= 0
3381 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3382 info
->callbacks
->einfo
3383 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3384 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3386 /* As a GNU extension, any input sections which are named
3387 .gnu.warning.SYMBOL are treated as warning symbols for the given
3388 symbol. This differs from .gnu.warning sections, which generate
3389 warnings when they are included in an output file. */
3390 /* PR 12761: Also generate this warning when building shared libraries. */
3391 if (info
->executable
|| info
->shared
)
3395 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3399 name
= bfd_get_section_name (abfd
, s
);
3400 if (CONST_STRNEQ (name
, ".gnu.warning."))
3405 name
+= sizeof ".gnu.warning." - 1;
3407 /* If this is a shared object, then look up the symbol
3408 in the hash table. If it is there, and it is already
3409 been defined, then we will not be using the entry
3410 from this shared object, so we don't need to warn.
3411 FIXME: If we see the definition in a regular object
3412 later on, we will warn, but we shouldn't. The only
3413 fix is to keep track of what warnings we are supposed
3414 to emit, and then handle them all at the end of the
3418 struct elf_link_hash_entry
*h
;
3420 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3422 /* FIXME: What about bfd_link_hash_common? */
3424 && (h
->root
.type
== bfd_link_hash_defined
3425 || h
->root
.type
== bfd_link_hash_defweak
))
3427 /* We don't want to issue this warning. Clobber
3428 the section size so that the warning does not
3429 get copied into the output file. */
3436 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3440 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3445 if (! (_bfd_generic_link_add_one_symbol
3446 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3447 FALSE
, bed
->collect
, NULL
)))
3450 if (! info
->relocatable
)
3452 /* Clobber the section size so that the warning does
3453 not get copied into the output file. */
3456 /* Also set SEC_EXCLUDE, so that symbols defined in
3457 the warning section don't get copied to the output. */
3458 s
->flags
|= SEC_EXCLUDE
;
3467 /* If we are creating a shared library, create all the dynamic
3468 sections immediately. We need to attach them to something,
3469 so we attach them to this BFD, provided it is the right
3470 format. FIXME: If there are no input BFD's of the same
3471 format as the output, we can't make a shared library. */
3473 && is_elf_hash_table (htab
)
3474 && info
->output_bfd
->xvec
== abfd
->xvec
3475 && !htab
->dynamic_sections_created
)
3477 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3481 else if (!is_elf_hash_table (htab
))
3486 const char *soname
= NULL
;
3488 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3491 /* ld --just-symbols and dynamic objects don't mix very well.
3492 ld shouldn't allow it. */
3493 if ((s
= abfd
->sections
) != NULL
3494 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
3497 /* If this dynamic lib was specified on the command line with
3498 --as-needed in effect, then we don't want to add a DT_NEEDED
3499 tag unless the lib is actually used. Similary for libs brought
3500 in by another lib's DT_NEEDED. When --no-add-needed is used
3501 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3502 any dynamic library in DT_NEEDED tags in the dynamic lib at
3504 add_needed
= (elf_dyn_lib_class (abfd
)
3505 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3506 | DYN_NO_NEEDED
)) == 0;
3508 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3513 unsigned int elfsec
;
3514 unsigned long shlink
;
3516 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3523 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3524 if (elfsec
== SHN_BAD
)
3525 goto error_free_dyn
;
3526 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3528 for (extdyn
= dynbuf
;
3529 extdyn
< dynbuf
+ s
->size
;
3530 extdyn
+= bed
->s
->sizeof_dyn
)
3532 Elf_Internal_Dyn dyn
;
3534 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3535 if (dyn
.d_tag
== DT_SONAME
)
3537 unsigned int tagv
= dyn
.d_un
.d_val
;
3538 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3540 goto error_free_dyn
;
3542 if (dyn
.d_tag
== DT_NEEDED
)
3544 struct bfd_link_needed_list
*n
, **pn
;
3546 unsigned int tagv
= dyn
.d_un
.d_val
;
3548 amt
= sizeof (struct bfd_link_needed_list
);
3549 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3550 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3551 if (n
== NULL
|| fnm
== NULL
)
3552 goto error_free_dyn
;
3553 amt
= strlen (fnm
) + 1;
3554 anm
= (char *) bfd_alloc (abfd
, amt
);
3556 goto error_free_dyn
;
3557 memcpy (anm
, fnm
, amt
);
3561 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3565 if (dyn
.d_tag
== DT_RUNPATH
)
3567 struct bfd_link_needed_list
*n
, **pn
;
3569 unsigned int tagv
= dyn
.d_un
.d_val
;
3571 amt
= sizeof (struct bfd_link_needed_list
);
3572 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3573 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3574 if (n
== NULL
|| fnm
== NULL
)
3575 goto error_free_dyn
;
3576 amt
= strlen (fnm
) + 1;
3577 anm
= (char *) bfd_alloc (abfd
, amt
);
3579 goto error_free_dyn
;
3580 memcpy (anm
, fnm
, amt
);
3584 for (pn
= & runpath
;
3590 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3591 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3593 struct bfd_link_needed_list
*n
, **pn
;
3595 unsigned int tagv
= dyn
.d_un
.d_val
;
3597 amt
= sizeof (struct bfd_link_needed_list
);
3598 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3599 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3600 if (n
== NULL
|| fnm
== NULL
)
3601 goto error_free_dyn
;
3602 amt
= strlen (fnm
) + 1;
3603 anm
= (char *) bfd_alloc (abfd
, amt
);
3605 goto error_free_dyn
;
3606 memcpy (anm
, fnm
, amt
);
3616 if (dyn
.d_tag
== DT_AUDIT
)
3618 unsigned int tagv
= dyn
.d_un
.d_val
;
3619 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3626 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3627 frees all more recently bfd_alloc'd blocks as well. */
3633 struct bfd_link_needed_list
**pn
;
3634 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3639 /* We do not want to include any of the sections in a dynamic
3640 object in the output file. We hack by simply clobbering the
3641 list of sections in the BFD. This could be handled more
3642 cleanly by, say, a new section flag; the existing
3643 SEC_NEVER_LOAD flag is not the one we want, because that one
3644 still implies that the section takes up space in the output
3646 bfd_section_list_clear (abfd
);
3648 /* Find the name to use in a DT_NEEDED entry that refers to this
3649 object. If the object has a DT_SONAME entry, we use it.
3650 Otherwise, if the generic linker stuck something in
3651 elf_dt_name, we use that. Otherwise, we just use the file
3653 if (soname
== NULL
|| *soname
== '\0')
3655 soname
= elf_dt_name (abfd
);
3656 if (soname
== NULL
|| *soname
== '\0')
3657 soname
= bfd_get_filename (abfd
);
3660 /* Save the SONAME because sometimes the linker emulation code
3661 will need to know it. */
3662 elf_dt_name (abfd
) = soname
;
3664 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3668 /* If we have already included this dynamic object in the
3669 link, just ignore it. There is no reason to include a
3670 particular dynamic object more than once. */
3674 /* Save the DT_AUDIT entry for the linker emulation code. */
3675 elf_dt_audit (abfd
) = audit
;
3678 /* If this is a dynamic object, we always link against the .dynsym
3679 symbol table, not the .symtab symbol table. The dynamic linker
3680 will only see the .dynsym symbol table, so there is no reason to
3681 look at .symtab for a dynamic object. */
3683 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3684 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3686 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3688 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3690 /* The sh_info field of the symtab header tells us where the
3691 external symbols start. We don't care about the local symbols at
3693 if (elf_bad_symtab (abfd
))
3695 extsymcount
= symcount
;
3700 extsymcount
= symcount
- hdr
->sh_info
;
3701 extsymoff
= hdr
->sh_info
;
3705 if (extsymcount
!= 0)
3707 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3709 if (isymbuf
== NULL
)
3712 /* We store a pointer to the hash table entry for each external
3714 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3715 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
3716 if (sym_hash
== NULL
)
3717 goto error_free_sym
;
3718 elf_sym_hashes (abfd
) = sym_hash
;
3723 /* Read in any version definitions. */
3724 if (!_bfd_elf_slurp_version_tables (abfd
,
3725 info
->default_imported_symver
))
3726 goto error_free_sym
;
3728 /* Read in the symbol versions, but don't bother to convert them
3729 to internal format. */
3730 if (elf_dynversym (abfd
) != 0)
3732 Elf_Internal_Shdr
*versymhdr
;
3734 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3735 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
3736 if (extversym
== NULL
)
3737 goto error_free_sym
;
3738 amt
= versymhdr
->sh_size
;
3739 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3740 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3741 goto error_free_vers
;
3745 /* If we are loading an as-needed shared lib, save the symbol table
3746 state before we start adding symbols. If the lib turns out
3747 to be unneeded, restore the state. */
3748 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3753 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3755 struct bfd_hash_entry
*p
;
3756 struct elf_link_hash_entry
*h
;
3758 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3760 h
= (struct elf_link_hash_entry
*) p
;
3761 entsize
+= htab
->root
.table
.entsize
;
3762 if (h
->root
.type
== bfd_link_hash_warning
)
3763 entsize
+= htab
->root
.table
.entsize
;
3767 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3768 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3769 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3770 if (old_tab
== NULL
)
3771 goto error_free_vers
;
3773 /* Remember the current objalloc pointer, so that all mem for
3774 symbols added can later be reclaimed. */
3775 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3776 if (alloc_mark
== NULL
)
3777 goto error_free_vers
;
3779 /* Make a special call to the linker "notice" function to
3780 tell it that we are about to handle an as-needed lib. */
3781 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3782 notice_as_needed
, 0, NULL
))
3783 goto error_free_vers
;
3785 /* Clone the symbol table and sym hashes. Remember some
3786 pointers into the symbol table, and dynamic symbol count. */
3787 old_hash
= (char *) old_tab
+ tabsize
;
3788 old_ent
= (char *) old_hash
+ hashsize
;
3789 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3790 memcpy (old_hash
, sym_hash
, hashsize
);
3791 old_undefs
= htab
->root
.undefs
;
3792 old_undefs_tail
= htab
->root
.undefs_tail
;
3793 old_table
= htab
->root
.table
.table
;
3794 old_size
= htab
->root
.table
.size
;
3795 old_count
= htab
->root
.table
.count
;
3796 old_dynsymcount
= htab
->dynsymcount
;
3797 old_dynstr_size
= _bfd_elf_strtab_size (htab
->dynstr
);
3799 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3801 struct bfd_hash_entry
*p
;
3802 struct elf_link_hash_entry
*h
;
3804 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3806 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3807 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3808 h
= (struct elf_link_hash_entry
*) p
;
3809 if (h
->root
.type
== bfd_link_hash_warning
)
3811 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3812 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3819 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3820 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3822 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3826 asection
*sec
, *new_sec
;
3829 struct elf_link_hash_entry
*h
;
3830 struct elf_link_hash_entry
*hi
;
3831 bfd_boolean definition
;
3832 bfd_boolean size_change_ok
;
3833 bfd_boolean type_change_ok
;
3834 bfd_boolean new_weakdef
;
3835 bfd_boolean new_weak
;
3836 bfd_boolean old_weak
;
3837 bfd_boolean override
;
3839 unsigned int old_alignment
;
3844 flags
= BSF_NO_FLAGS
;
3846 value
= isym
->st_value
;
3848 common
= bed
->common_definition (isym
);
3850 bind
= ELF_ST_BIND (isym
->st_info
);
3854 /* This should be impossible, since ELF requires that all
3855 global symbols follow all local symbols, and that sh_info
3856 point to the first global symbol. Unfortunately, Irix 5
3861 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3869 case STB_GNU_UNIQUE
:
3870 flags
= BSF_GNU_UNIQUE
;
3874 /* Leave it up to the processor backend. */
3878 if (isym
->st_shndx
== SHN_UNDEF
)
3879 sec
= bfd_und_section_ptr
;
3880 else if (isym
->st_shndx
== SHN_ABS
)
3881 sec
= bfd_abs_section_ptr
;
3882 else if (isym
->st_shndx
== SHN_COMMON
)
3884 sec
= bfd_com_section_ptr
;
3885 /* What ELF calls the size we call the value. What ELF
3886 calls the value we call the alignment. */
3887 value
= isym
->st_size
;
3891 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3893 sec
= bfd_abs_section_ptr
;
3894 else if (discarded_section (sec
))
3896 /* Symbols from discarded section are undefined. We keep
3898 sec
= bfd_und_section_ptr
;
3899 isym
->st_shndx
= SHN_UNDEF
;
3901 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3905 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3908 goto error_free_vers
;
3910 if (isym
->st_shndx
== SHN_COMMON
3911 && (abfd
->flags
& BFD_PLUGIN
) != 0)
3913 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
3917 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
3919 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
3921 goto error_free_vers
;
3925 else if (isym
->st_shndx
== SHN_COMMON
3926 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3927 && !info
->relocatable
)
3929 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3933 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
3934 | SEC_LINKER_CREATED
);
3935 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
3937 goto error_free_vers
;
3941 else if (bed
->elf_add_symbol_hook
)
3943 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3945 goto error_free_vers
;
3947 /* The hook function sets the name to NULL if this symbol
3948 should be skipped for some reason. */
3953 /* Sanity check that all possibilities were handled. */
3956 bfd_set_error (bfd_error_bad_value
);
3957 goto error_free_vers
;
3960 /* Silently discard TLS symbols from --just-syms. There's
3961 no way to combine a static TLS block with a new TLS block
3962 for this executable. */
3963 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3964 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
3967 if (bfd_is_und_section (sec
)
3968 || bfd_is_com_section (sec
))
3973 size_change_ok
= FALSE
;
3974 type_change_ok
= bed
->type_change_ok
;
3980 if (is_elf_hash_table (htab
))
3982 Elf_Internal_Versym iver
;
3983 unsigned int vernum
= 0;
3988 if (info
->default_imported_symver
)
3989 /* Use the default symbol version created earlier. */
3990 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
3995 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3997 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3999 /* If this is a hidden symbol, or if it is not version
4000 1, we append the version name to the symbol name.
4001 However, we do not modify a non-hidden absolute symbol
4002 if it is not a function, because it might be the version
4003 symbol itself. FIXME: What if it isn't? */
4004 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4006 && (!bfd_is_abs_section (sec
)
4007 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4010 size_t namelen
, verlen
, newlen
;
4013 if (isym
->st_shndx
!= SHN_UNDEF
)
4015 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4017 else if (vernum
> 1)
4019 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4025 (*_bfd_error_handler
)
4026 (_("%B: %s: invalid version %u (max %d)"),
4028 elf_tdata (abfd
)->cverdefs
);
4029 bfd_set_error (bfd_error_bad_value
);
4030 goto error_free_vers
;
4035 /* We cannot simply test for the number of
4036 entries in the VERNEED section since the
4037 numbers for the needed versions do not start
4039 Elf_Internal_Verneed
*t
;
4042 for (t
= elf_tdata (abfd
)->verref
;
4046 Elf_Internal_Vernaux
*a
;
4048 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4050 if (a
->vna_other
== vernum
)
4052 verstr
= a
->vna_nodename
;
4061 (*_bfd_error_handler
)
4062 (_("%B: %s: invalid needed version %d"),
4063 abfd
, name
, vernum
);
4064 bfd_set_error (bfd_error_bad_value
);
4065 goto error_free_vers
;
4069 namelen
= strlen (name
);
4070 verlen
= strlen (verstr
);
4071 newlen
= namelen
+ verlen
+ 2;
4072 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4073 && isym
->st_shndx
!= SHN_UNDEF
)
4076 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4077 if (newname
== NULL
)
4078 goto error_free_vers
;
4079 memcpy (newname
, name
, namelen
);
4080 p
= newname
+ namelen
;
4082 /* If this is a defined non-hidden version symbol,
4083 we add another @ to the name. This indicates the
4084 default version of the symbol. */
4085 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4086 && isym
->st_shndx
!= SHN_UNDEF
)
4088 memcpy (p
, verstr
, verlen
+ 1);
4093 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4094 sym_hash
, &old_bfd
, &old_weak
,
4095 &old_alignment
, &skip
, &override
,
4096 &type_change_ok
, &size_change_ok
))
4097 goto error_free_vers
;
4106 while (h
->root
.type
== bfd_link_hash_indirect
4107 || h
->root
.type
== bfd_link_hash_warning
)
4108 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4110 if (elf_tdata (abfd
)->verdef
!= NULL
4113 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4116 if (! (_bfd_generic_link_add_one_symbol
4117 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4118 (struct bfd_link_hash_entry
**) sym_hash
)))
4119 goto error_free_vers
;
4122 /* We need to make sure that indirect symbol dynamic flags are
4125 while (h
->root
.type
== bfd_link_hash_indirect
4126 || h
->root
.type
== bfd_link_hash_warning
)
4127 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4131 new_weak
= (flags
& BSF_WEAK
) != 0;
4132 new_weakdef
= FALSE
;
4136 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4137 && is_elf_hash_table (htab
)
4138 && h
->u
.weakdef
== NULL
)
4140 /* Keep a list of all weak defined non function symbols from
4141 a dynamic object, using the weakdef field. Later in this
4142 function we will set the weakdef field to the correct
4143 value. We only put non-function symbols from dynamic
4144 objects on this list, because that happens to be the only
4145 time we need to know the normal symbol corresponding to a
4146 weak symbol, and the information is time consuming to
4147 figure out. If the weakdef field is not already NULL,
4148 then this symbol was already defined by some previous
4149 dynamic object, and we will be using that previous
4150 definition anyhow. */
4152 h
->u
.weakdef
= weaks
;
4157 /* Set the alignment of a common symbol. */
4158 if ((common
|| bfd_is_com_section (sec
))
4159 && h
->root
.type
== bfd_link_hash_common
)
4164 align
= bfd_log2 (isym
->st_value
);
4167 /* The new symbol is a common symbol in a shared object.
4168 We need to get the alignment from the section. */
4169 align
= new_sec
->alignment_power
;
4171 if (align
> old_alignment
)
4172 h
->root
.u
.c
.p
->alignment_power
= align
;
4174 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4177 if (is_elf_hash_table (htab
))
4179 /* Set a flag in the hash table entry indicating the type of
4180 reference or definition we just found. A dynamic symbol
4181 is one which is referenced or defined by both a regular
4182 object and a shared object. */
4183 bfd_boolean dynsym
= FALSE
;
4185 /* Plugin symbols aren't normal. Don't set def_regular or
4186 ref_regular for them, or make them dynamic. */
4187 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4194 if (bind
!= STB_WEAK
)
4195 h
->ref_regular_nonweak
= 1;
4207 /* If the indirect symbol has been forced local, don't
4208 make the real symbol dynamic. */
4209 if ((h
== hi
|| !hi
->forced_local
)
4210 && (! info
->executable
4220 hi
->ref_dynamic
= 1;
4225 hi
->def_dynamic
= 1;
4228 /* If the indirect symbol has been forced local, don't
4229 make the real symbol dynamic. */
4230 if ((h
== hi
|| !hi
->forced_local
)
4233 || (h
->u
.weakdef
!= NULL
4235 && h
->u
.weakdef
->dynindx
!= -1)))
4239 /* Check to see if we need to add an indirect symbol for
4240 the default name. */
4242 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
4243 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4244 sec
, value
, &old_bfd
, &dynsym
))
4245 goto error_free_vers
;
4247 /* Check the alignment when a common symbol is involved. This
4248 can change when a common symbol is overridden by a normal
4249 definition or a common symbol is ignored due to the old
4250 normal definition. We need to make sure the maximum
4251 alignment is maintained. */
4252 if ((old_alignment
|| common
)
4253 && h
->root
.type
!= bfd_link_hash_common
)
4255 unsigned int common_align
;
4256 unsigned int normal_align
;
4257 unsigned int symbol_align
;
4261 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
4262 || h
->root
.type
== bfd_link_hash_defweak
);
4264 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4265 if (h
->root
.u
.def
.section
->owner
!= NULL
4266 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4268 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4269 if (normal_align
> symbol_align
)
4270 normal_align
= symbol_align
;
4273 normal_align
= symbol_align
;
4277 common_align
= old_alignment
;
4278 common_bfd
= old_bfd
;
4283 common_align
= bfd_log2 (isym
->st_value
);
4285 normal_bfd
= old_bfd
;
4288 if (normal_align
< common_align
)
4290 /* PR binutils/2735 */
4291 if (normal_bfd
== NULL
)
4292 (*_bfd_error_handler
)
4293 (_("Warning: alignment %u of common symbol `%s' in %B is"
4294 " greater than the alignment (%u) of its section %A"),
4295 common_bfd
, h
->root
.u
.def
.section
,
4296 1 << common_align
, name
, 1 << normal_align
);
4298 (*_bfd_error_handler
)
4299 (_("Warning: alignment %u of symbol `%s' in %B"
4300 " is smaller than %u in %B"),
4301 normal_bfd
, common_bfd
,
4302 1 << normal_align
, name
, 1 << common_align
);
4306 /* Remember the symbol size if it isn't undefined. */
4307 if (isym
->st_size
!= 0
4308 && isym
->st_shndx
!= SHN_UNDEF
4309 && (definition
|| h
->size
== 0))
4312 && h
->size
!= isym
->st_size
4313 && ! size_change_ok
)
4314 (*_bfd_error_handler
)
4315 (_("Warning: size of symbol `%s' changed"
4316 " from %lu in %B to %lu in %B"),
4318 name
, (unsigned long) h
->size
,
4319 (unsigned long) isym
->st_size
);
4321 h
->size
= isym
->st_size
;
4324 /* If this is a common symbol, then we always want H->SIZE
4325 to be the size of the common symbol. The code just above
4326 won't fix the size if a common symbol becomes larger. We
4327 don't warn about a size change here, because that is
4328 covered by --warn-common. Allow changes between different
4330 if (h
->root
.type
== bfd_link_hash_common
)
4331 h
->size
= h
->root
.u
.c
.size
;
4333 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4334 && ((definition
&& !new_weak
)
4335 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
4336 || h
->type
== STT_NOTYPE
))
4338 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
4340 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4342 if (type
== STT_GNU_IFUNC
4343 && (abfd
->flags
& DYNAMIC
) != 0)
4346 if (h
->type
!= type
)
4348 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
4349 (*_bfd_error_handler
)
4350 (_("Warning: type of symbol `%s' changed"
4351 " from %d to %d in %B"),
4352 abfd
, name
, h
->type
, type
);
4358 /* Merge st_other field. */
4359 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4361 /* We don't want to make debug symbol dynamic. */
4362 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4365 /* Nor should we make plugin symbols dynamic. */
4366 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4371 h
->target_internal
= isym
->st_target_internal
;
4372 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4375 if (definition
&& !dynamic
)
4377 char *p
= strchr (name
, ELF_VER_CHR
);
4378 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4380 /* Queue non-default versions so that .symver x, x@FOO
4381 aliases can be checked. */
4384 amt
= ((isymend
- isym
+ 1)
4385 * sizeof (struct elf_link_hash_entry
*));
4387 (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4389 goto error_free_vers
;
4391 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4395 if (dynsym
&& h
->dynindx
== -1)
4397 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4398 goto error_free_vers
;
4399 if (h
->u
.weakdef
!= NULL
4401 && h
->u
.weakdef
->dynindx
== -1)
4403 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4404 goto error_free_vers
;
4407 else if (dynsym
&& h
->dynindx
!= -1)
4408 /* If the symbol already has a dynamic index, but
4409 visibility says it should not be visible, turn it into
4411 switch (ELF_ST_VISIBILITY (h
->other
))
4415 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4420 /* Don't add DT_NEEDED for references from the dummy bfd. */
4424 && h
->ref_regular_nonweak
4426 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
4427 || (h
->ref_dynamic_nonweak
4428 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4429 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4432 const char *soname
= elf_dt_name (abfd
);
4434 /* A symbol from a library loaded via DT_NEEDED of some
4435 other library is referenced by a regular object.
4436 Add a DT_NEEDED entry for it. Issue an error if
4437 --no-add-needed is used and the reference was not
4440 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4442 (*_bfd_error_handler
)
4443 (_("%B: undefined reference to symbol '%s'"),
4445 bfd_set_error (bfd_error_missing_dso
);
4446 goto error_free_vers
;
4449 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4450 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4453 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4455 goto error_free_vers
;
4457 BFD_ASSERT (ret
== 0);
4462 if (extversym
!= NULL
)
4468 if (isymbuf
!= NULL
)
4474 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4478 /* Restore the symbol table. */
4479 if (bed
->as_needed_cleanup
)
4480 (*bed
->as_needed_cleanup
) (abfd
, info
);
4481 old_hash
= (char *) old_tab
+ tabsize
;
4482 old_ent
= (char *) old_hash
+ hashsize
;
4483 sym_hash
= elf_sym_hashes (abfd
);
4484 htab
->root
.table
.table
= old_table
;
4485 htab
->root
.table
.size
= old_size
;
4486 htab
->root
.table
.count
= old_count
;
4487 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4488 memcpy (sym_hash
, old_hash
, hashsize
);
4489 htab
->root
.undefs
= old_undefs
;
4490 htab
->root
.undefs_tail
= old_undefs_tail
;
4491 _bfd_elf_strtab_restore_size (htab
->dynstr
, old_dynstr_size
);
4492 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4494 struct bfd_hash_entry
*p
;
4495 struct elf_link_hash_entry
*h
;
4497 unsigned int alignment_power
;
4499 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4501 h
= (struct elf_link_hash_entry
*) p
;
4502 if (h
->root
.type
== bfd_link_hash_warning
)
4503 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4504 if (h
->dynindx
>= old_dynsymcount
4505 && h
->dynstr_index
< old_dynstr_size
)
4506 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4508 /* Preserve the maximum alignment and size for common
4509 symbols even if this dynamic lib isn't on DT_NEEDED
4510 since it can still be loaded at run time by another
4512 if (h
->root
.type
== bfd_link_hash_common
)
4514 size
= h
->root
.u
.c
.size
;
4515 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
4520 alignment_power
= 0;
4522 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4523 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4524 h
= (struct elf_link_hash_entry
*) p
;
4525 if (h
->root
.type
== bfd_link_hash_warning
)
4527 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4528 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4529 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4531 if (h
->root
.type
== bfd_link_hash_common
)
4533 if (size
> h
->root
.u
.c
.size
)
4534 h
->root
.u
.c
.size
= size
;
4535 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
4536 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
4541 /* Make a special call to the linker "notice" function to
4542 tell it that symbols added for crefs may need to be removed. */
4543 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4544 notice_not_needed
, 0, NULL
))
4545 goto error_free_vers
;
4548 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4550 if (nondeflt_vers
!= NULL
)
4551 free (nondeflt_vers
);
4555 if (old_tab
!= NULL
)
4557 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4558 notice_needed
, 0, NULL
))
4559 goto error_free_vers
;
4564 /* Now that all the symbols from this input file are created, handle
4565 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4566 if (nondeflt_vers
!= NULL
)
4568 bfd_size_type cnt
, symidx
;
4570 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4572 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4573 char *shortname
, *p
;
4575 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4577 || (h
->root
.type
!= bfd_link_hash_defined
4578 && h
->root
.type
!= bfd_link_hash_defweak
))
4581 amt
= p
- h
->root
.root
.string
;
4582 shortname
= (char *) bfd_malloc (amt
+ 1);
4584 goto error_free_vers
;
4585 memcpy (shortname
, h
->root
.root
.string
, amt
);
4586 shortname
[amt
] = '\0';
4588 hi
= (struct elf_link_hash_entry
*)
4589 bfd_link_hash_lookup (&htab
->root
, shortname
,
4590 FALSE
, FALSE
, FALSE
);
4592 && hi
->root
.type
== h
->root
.type
4593 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4594 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4596 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4597 hi
->root
.type
= bfd_link_hash_indirect
;
4598 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4599 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4600 sym_hash
= elf_sym_hashes (abfd
);
4602 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4603 if (sym_hash
[symidx
] == hi
)
4605 sym_hash
[symidx
] = h
;
4611 free (nondeflt_vers
);
4612 nondeflt_vers
= NULL
;
4615 /* Now set the weakdefs field correctly for all the weak defined
4616 symbols we found. The only way to do this is to search all the
4617 symbols. Since we only need the information for non functions in
4618 dynamic objects, that's the only time we actually put anything on
4619 the list WEAKS. We need this information so that if a regular
4620 object refers to a symbol defined weakly in a dynamic object, the
4621 real symbol in the dynamic object is also put in the dynamic
4622 symbols; we also must arrange for both symbols to point to the
4623 same memory location. We could handle the general case of symbol
4624 aliasing, but a general symbol alias can only be generated in
4625 assembler code, handling it correctly would be very time
4626 consuming, and other ELF linkers don't handle general aliasing
4630 struct elf_link_hash_entry
**hpp
;
4631 struct elf_link_hash_entry
**hppend
;
4632 struct elf_link_hash_entry
**sorted_sym_hash
;
4633 struct elf_link_hash_entry
*h
;
4636 /* Since we have to search the whole symbol list for each weak
4637 defined symbol, search time for N weak defined symbols will be
4638 O(N^2). Binary search will cut it down to O(NlogN). */
4639 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4640 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4641 if (sorted_sym_hash
== NULL
)
4643 sym_hash
= sorted_sym_hash
;
4644 hpp
= elf_sym_hashes (abfd
);
4645 hppend
= hpp
+ extsymcount
;
4647 for (; hpp
< hppend
; hpp
++)
4651 && h
->root
.type
== bfd_link_hash_defined
4652 && !bed
->is_function_type (h
->type
))
4660 qsort (sorted_sym_hash
, sym_count
,
4661 sizeof (struct elf_link_hash_entry
*),
4664 while (weaks
!= NULL
)
4666 struct elf_link_hash_entry
*hlook
;
4672 weaks
= hlook
->u
.weakdef
;
4673 hlook
->u
.weakdef
= NULL
;
4675 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4676 || hlook
->root
.type
== bfd_link_hash_defweak
4677 || hlook
->root
.type
== bfd_link_hash_common
4678 || hlook
->root
.type
== bfd_link_hash_indirect
);
4679 slook
= hlook
->root
.u
.def
.section
;
4680 vlook
= hlook
->root
.u
.def
.value
;
4686 bfd_signed_vma vdiff
;
4688 h
= sorted_sym_hash
[idx
];
4689 vdiff
= vlook
- h
->root
.u
.def
.value
;
4696 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4706 /* We didn't find a value/section match. */
4710 /* With multiple aliases, or when the weak symbol is already
4711 strongly defined, we have multiple matching symbols and
4712 the binary search above may land on any of them. Step
4713 one past the matching symbol(s). */
4716 h
= sorted_sym_hash
[idx
];
4717 if (h
->root
.u
.def
.section
!= slook
4718 || h
->root
.u
.def
.value
!= vlook
)
4722 /* Now look back over the aliases. Since we sorted by size
4723 as well as value and section, we'll choose the one with
4724 the largest size. */
4727 h
= sorted_sym_hash
[idx
];
4729 /* Stop if value or section doesn't match. */
4730 if (h
->root
.u
.def
.section
!= slook
4731 || h
->root
.u
.def
.value
!= vlook
)
4733 else if (h
!= hlook
)
4735 hlook
->u
.weakdef
= h
;
4737 /* If the weak definition is in the list of dynamic
4738 symbols, make sure the real definition is put
4740 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4742 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4745 free (sorted_sym_hash
);
4750 /* If the real definition is in the list of dynamic
4751 symbols, make sure the weak definition is put
4752 there as well. If we don't do this, then the
4753 dynamic loader might not merge the entries for the
4754 real definition and the weak definition. */
4755 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4757 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4758 goto err_free_sym_hash
;
4765 free (sorted_sym_hash
);
4768 if (bed
->check_directives
4769 && !(*bed
->check_directives
) (abfd
, info
))
4772 /* If this object is the same format as the output object, and it is
4773 not a shared library, then let the backend look through the
4776 This is required to build global offset table entries and to
4777 arrange for dynamic relocs. It is not required for the
4778 particular common case of linking non PIC code, even when linking
4779 against shared libraries, but unfortunately there is no way of
4780 knowing whether an object file has been compiled PIC or not.
4781 Looking through the relocs is not particularly time consuming.
4782 The problem is that we must either (1) keep the relocs in memory,
4783 which causes the linker to require additional runtime memory or
4784 (2) read the relocs twice from the input file, which wastes time.
4785 This would be a good case for using mmap.
4787 I have no idea how to handle linking PIC code into a file of a
4788 different format. It probably can't be done. */
4790 && is_elf_hash_table (htab
)
4791 && bed
->check_relocs
!= NULL
4792 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4793 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4797 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4799 Elf_Internal_Rela
*internal_relocs
;
4802 if ((o
->flags
& SEC_RELOC
) == 0
4803 || o
->reloc_count
== 0
4804 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4805 && (o
->flags
& SEC_DEBUGGING
) != 0)
4806 || bfd_is_abs_section (o
->output_section
))
4809 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4811 if (internal_relocs
== NULL
)
4814 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4816 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4817 free (internal_relocs
);
4824 /* If this is a non-traditional link, try to optimize the handling
4825 of the .stab/.stabstr sections. */
4827 && ! info
->traditional_format
4828 && is_elf_hash_table (htab
)
4829 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4833 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4834 if (stabstr
!= NULL
)
4836 bfd_size_type string_offset
= 0;
4839 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4840 if (CONST_STRNEQ (stab
->name
, ".stab")
4841 && (!stab
->name
[5] ||
4842 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4843 && (stab
->flags
& SEC_MERGE
) == 0
4844 && !bfd_is_abs_section (stab
->output_section
))
4846 struct bfd_elf_section_data
*secdata
;
4848 secdata
= elf_section_data (stab
);
4849 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4850 stabstr
, &secdata
->sec_info
,
4853 if (secdata
->sec_info
)
4854 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
4859 if (is_elf_hash_table (htab
) && add_needed
)
4861 /* Add this bfd to the loaded list. */
4862 struct elf_link_loaded_list
*n
;
4864 n
= (struct elf_link_loaded_list
*)
4865 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4869 n
->next
= htab
->loaded
;
4876 if (old_tab
!= NULL
)
4878 if (nondeflt_vers
!= NULL
)
4879 free (nondeflt_vers
);
4880 if (extversym
!= NULL
)
4883 if (isymbuf
!= NULL
)
4889 /* Return the linker hash table entry of a symbol that might be
4890 satisfied by an archive symbol. Return -1 on error. */
4892 struct elf_link_hash_entry
*
4893 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4894 struct bfd_link_info
*info
,
4897 struct elf_link_hash_entry
*h
;
4901 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
4905 /* If this is a default version (the name contains @@), look up the
4906 symbol again with only one `@' as well as without the version.
4907 The effect is that references to the symbol with and without the
4908 version will be matched by the default symbol in the archive. */
4910 p
= strchr (name
, ELF_VER_CHR
);
4911 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4914 /* First check with only one `@'. */
4915 len
= strlen (name
);
4916 copy
= (char *) bfd_alloc (abfd
, len
);
4918 return (struct elf_link_hash_entry
*) 0 - 1;
4920 first
= p
- name
+ 1;
4921 memcpy (copy
, name
, first
);
4922 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4924 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
4927 /* We also need to check references to the symbol without the
4929 copy
[first
- 1] = '\0';
4930 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4931 FALSE
, FALSE
, TRUE
);
4934 bfd_release (abfd
, copy
);
4938 /* Add symbols from an ELF archive file to the linker hash table. We
4939 don't use _bfd_generic_link_add_archive_symbols because of a
4940 problem which arises on UnixWare. The UnixWare libc.so is an
4941 archive which includes an entry libc.so.1 which defines a bunch of
4942 symbols. The libc.so archive also includes a number of other
4943 object files, which also define symbols, some of which are the same
4944 as those defined in libc.so.1. Correct linking requires that we
4945 consider each object file in turn, and include it if it defines any
4946 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4947 this; it looks through the list of undefined symbols, and includes
4948 any object file which defines them. When this algorithm is used on
4949 UnixWare, it winds up pulling in libc.so.1 early and defining a
4950 bunch of symbols. This means that some of the other objects in the
4951 archive are not included in the link, which is incorrect since they
4952 precede libc.so.1 in the archive.
4954 Fortunately, ELF archive handling is simpler than that done by
4955 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4956 oddities. In ELF, if we find a symbol in the archive map, and the
4957 symbol is currently undefined, we know that we must pull in that
4960 Unfortunately, we do have to make multiple passes over the symbol
4961 table until nothing further is resolved. */
4964 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4967 bfd_boolean
*defined
= NULL
;
4968 bfd_boolean
*included
= NULL
;
4972 const struct elf_backend_data
*bed
;
4973 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4974 (bfd
*, struct bfd_link_info
*, const char *);
4976 if (! bfd_has_map (abfd
))
4978 /* An empty archive is a special case. */
4979 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4981 bfd_set_error (bfd_error_no_armap
);
4985 /* Keep track of all symbols we know to be already defined, and all
4986 files we know to be already included. This is to speed up the
4987 second and subsequent passes. */
4988 c
= bfd_ardata (abfd
)->symdef_count
;
4992 amt
*= sizeof (bfd_boolean
);
4993 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
4994 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
4995 if (defined
== NULL
|| included
== NULL
)
4998 symdefs
= bfd_ardata (abfd
)->symdefs
;
4999 bed
= get_elf_backend_data (abfd
);
5000 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5013 symdefend
= symdef
+ c
;
5014 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5016 struct elf_link_hash_entry
*h
;
5018 struct bfd_link_hash_entry
*undefs_tail
;
5021 if (defined
[i
] || included
[i
])
5023 if (symdef
->file_offset
== last
)
5029 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5030 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5036 if (h
->root
.type
== bfd_link_hash_common
)
5038 /* We currently have a common symbol. The archive map contains
5039 a reference to this symbol, so we may want to include it. We
5040 only want to include it however, if this archive element
5041 contains a definition of the symbol, not just another common
5044 Unfortunately some archivers (including GNU ar) will put
5045 declarations of common symbols into their archive maps, as
5046 well as real definitions, so we cannot just go by the archive
5047 map alone. Instead we must read in the element's symbol
5048 table and check that to see what kind of symbol definition
5050 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5053 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5055 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5060 /* We need to include this archive member. */
5061 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5062 if (element
== NULL
)
5065 if (! bfd_check_format (element
, bfd_object
))
5068 /* Doublecheck that we have not included this object
5069 already--it should be impossible, but there may be
5070 something wrong with the archive. */
5071 if (element
->archive_pass
!= 0)
5073 bfd_set_error (bfd_error_bad_value
);
5076 element
->archive_pass
= 1;
5078 undefs_tail
= info
->hash
->undefs_tail
;
5080 if (!(*info
->callbacks
5081 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5083 if (!bfd_link_add_symbols (element
, info
))
5086 /* If there are any new undefined symbols, we need to make
5087 another pass through the archive in order to see whether
5088 they can be defined. FIXME: This isn't perfect, because
5089 common symbols wind up on undefs_tail and because an
5090 undefined symbol which is defined later on in this pass
5091 does not require another pass. This isn't a bug, but it
5092 does make the code less efficient than it could be. */
5093 if (undefs_tail
!= info
->hash
->undefs_tail
)
5096 /* Look backward to mark all symbols from this object file
5097 which we have already seen in this pass. */
5101 included
[mark
] = TRUE
;
5106 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5108 /* We mark subsequent symbols from this object file as we go
5109 on through the loop. */
5110 last
= symdef
->file_offset
;
5121 if (defined
!= NULL
)
5123 if (included
!= NULL
)
5128 /* Given an ELF BFD, add symbols to the global hash table as
5132 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5134 switch (bfd_get_format (abfd
))
5137 return elf_link_add_object_symbols (abfd
, info
);
5139 return elf_link_add_archive_symbols (abfd
, info
);
5141 bfd_set_error (bfd_error_wrong_format
);
5146 struct hash_codes_info
5148 unsigned long *hashcodes
;
5152 /* This function will be called though elf_link_hash_traverse to store
5153 all hash value of the exported symbols in an array. */
5156 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5158 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5164 /* Ignore indirect symbols. These are added by the versioning code. */
5165 if (h
->dynindx
== -1)
5168 name
= h
->root
.root
.string
;
5169 p
= strchr (name
, ELF_VER_CHR
);
5172 alc
= (char *) bfd_malloc (p
- name
+ 1);
5178 memcpy (alc
, name
, p
- name
);
5179 alc
[p
- name
] = '\0';
5183 /* Compute the hash value. */
5184 ha
= bfd_elf_hash (name
);
5186 /* Store the found hash value in the array given as the argument. */
5187 *(inf
->hashcodes
)++ = ha
;
5189 /* And store it in the struct so that we can put it in the hash table
5191 h
->u
.elf_hash_value
= ha
;
5199 struct collect_gnu_hash_codes
5202 const struct elf_backend_data
*bed
;
5203 unsigned long int nsyms
;
5204 unsigned long int maskbits
;
5205 unsigned long int *hashcodes
;
5206 unsigned long int *hashval
;
5207 unsigned long int *indx
;
5208 unsigned long int *counts
;
5211 long int min_dynindx
;
5212 unsigned long int bucketcount
;
5213 unsigned long int symindx
;
5214 long int local_indx
;
5215 long int shift1
, shift2
;
5216 unsigned long int mask
;
5220 /* This function will be called though elf_link_hash_traverse to store
5221 all hash value of the exported symbols in an array. */
5224 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5226 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5232 /* Ignore indirect symbols. These are added by the versioning code. */
5233 if (h
->dynindx
== -1)
5236 /* Ignore also local symbols and undefined symbols. */
5237 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5240 name
= h
->root
.root
.string
;
5241 p
= strchr (name
, ELF_VER_CHR
);
5244 alc
= (char *) bfd_malloc (p
- name
+ 1);
5250 memcpy (alc
, name
, p
- name
);
5251 alc
[p
- name
] = '\0';
5255 /* Compute the hash value. */
5256 ha
= bfd_elf_gnu_hash (name
);
5258 /* Store the found hash value in the array for compute_bucket_count,
5259 and also for .dynsym reordering purposes. */
5260 s
->hashcodes
[s
->nsyms
] = ha
;
5261 s
->hashval
[h
->dynindx
] = ha
;
5263 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5264 s
->min_dynindx
= h
->dynindx
;
5272 /* This function will be called though elf_link_hash_traverse to do
5273 final dynaminc symbol renumbering. */
5276 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5278 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5279 unsigned long int bucket
;
5280 unsigned long int val
;
5282 /* Ignore indirect symbols. */
5283 if (h
->dynindx
== -1)
5286 /* Ignore also local symbols and undefined symbols. */
5287 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5289 if (h
->dynindx
>= s
->min_dynindx
)
5290 h
->dynindx
= s
->local_indx
++;
5294 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5295 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5296 & ((s
->maskbits
>> s
->shift1
) - 1);
5297 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5299 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5300 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5301 if (s
->counts
[bucket
] == 1)
5302 /* Last element terminates the chain. */
5304 bfd_put_32 (s
->output_bfd
, val
,
5305 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5306 --s
->counts
[bucket
];
5307 h
->dynindx
= s
->indx
[bucket
]++;
5311 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5314 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5316 return !(h
->forced_local
5317 || h
->root
.type
== bfd_link_hash_undefined
5318 || h
->root
.type
== bfd_link_hash_undefweak
5319 || ((h
->root
.type
== bfd_link_hash_defined
5320 || h
->root
.type
== bfd_link_hash_defweak
)
5321 && h
->root
.u
.def
.section
->output_section
== NULL
));
5324 /* Array used to determine the number of hash table buckets to use
5325 based on the number of symbols there are. If there are fewer than
5326 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5327 fewer than 37 we use 17 buckets, and so forth. We never use more
5328 than 32771 buckets. */
5330 static const size_t elf_buckets
[] =
5332 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5336 /* Compute bucket count for hashing table. We do not use a static set
5337 of possible tables sizes anymore. Instead we determine for all
5338 possible reasonable sizes of the table the outcome (i.e., the
5339 number of collisions etc) and choose the best solution. The
5340 weighting functions are not too simple to allow the table to grow
5341 without bounds. Instead one of the weighting factors is the size.
5342 Therefore the result is always a good payoff between few collisions
5343 (= short chain lengths) and table size. */
5345 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5346 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5347 unsigned long int nsyms
,
5350 size_t best_size
= 0;
5351 unsigned long int i
;
5353 /* We have a problem here. The following code to optimize the table
5354 size requires an integer type with more the 32 bits. If
5355 BFD_HOST_U_64_BIT is set we know about such a type. */
5356 #ifdef BFD_HOST_U_64_BIT
5361 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5362 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5363 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5364 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5365 unsigned long int *counts
;
5367 unsigned int no_improvement_count
= 0;
5369 /* Possible optimization parameters: if we have NSYMS symbols we say
5370 that the hashing table must at least have NSYMS/4 and at most
5372 minsize
= nsyms
/ 4;
5375 best_size
= maxsize
= nsyms
* 2;
5380 if ((best_size
& 31) == 0)
5384 /* Create array where we count the collisions in. We must use bfd_malloc
5385 since the size could be large. */
5387 amt
*= sizeof (unsigned long int);
5388 counts
= (unsigned long int *) bfd_malloc (amt
);
5392 /* Compute the "optimal" size for the hash table. The criteria is a
5393 minimal chain length. The minor criteria is (of course) the size
5395 for (i
= minsize
; i
< maxsize
; ++i
)
5397 /* Walk through the array of hashcodes and count the collisions. */
5398 BFD_HOST_U_64_BIT max
;
5399 unsigned long int j
;
5400 unsigned long int fact
;
5402 if (gnu_hash
&& (i
& 31) == 0)
5405 memset (counts
, '\0', i
* sizeof (unsigned long int));
5407 /* Determine how often each hash bucket is used. */
5408 for (j
= 0; j
< nsyms
; ++j
)
5409 ++counts
[hashcodes
[j
] % i
];
5411 /* For the weight function we need some information about the
5412 pagesize on the target. This is information need not be 100%
5413 accurate. Since this information is not available (so far) we
5414 define it here to a reasonable default value. If it is crucial
5415 to have a better value some day simply define this value. */
5416 # ifndef BFD_TARGET_PAGESIZE
5417 # define BFD_TARGET_PAGESIZE (4096)
5420 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5422 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5425 /* Variant 1: optimize for short chains. We add the squares
5426 of all the chain lengths (which favors many small chain
5427 over a few long chains). */
5428 for (j
= 0; j
< i
; ++j
)
5429 max
+= counts
[j
] * counts
[j
];
5431 /* This adds penalties for the overall size of the table. */
5432 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5435 /* Variant 2: Optimize a lot more for small table. Here we
5436 also add squares of the size but we also add penalties for
5437 empty slots (the +1 term). */
5438 for (j
= 0; j
< i
; ++j
)
5439 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5441 /* The overall size of the table is considered, but not as
5442 strong as in variant 1, where it is squared. */
5443 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5447 /* Compare with current best results. */
5448 if (max
< best_chlen
)
5452 no_improvement_count
= 0;
5454 /* PR 11843: Avoid futile long searches for the best bucket size
5455 when there are a large number of symbols. */
5456 else if (++no_improvement_count
== 100)
5463 #endif /* defined (BFD_HOST_U_64_BIT) */
5465 /* This is the fallback solution if no 64bit type is available or if we
5466 are not supposed to spend much time on optimizations. We select the
5467 bucket count using a fixed set of numbers. */
5468 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5470 best_size
= elf_buckets
[i
];
5471 if (nsyms
< elf_buckets
[i
+ 1])
5474 if (gnu_hash
&& best_size
< 2)
5481 /* Size any SHT_GROUP section for ld -r. */
5484 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
5488 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
5489 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
5490 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
5495 /* Set a default stack segment size. The value in INFO wins. If it
5496 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5497 undefined it is initialized. */
5500 bfd_elf_stack_segment_size (bfd
*output_bfd
,
5501 struct bfd_link_info
*info
,
5502 const char *legacy_symbol
,
5503 bfd_vma default_size
)
5505 struct elf_link_hash_entry
*h
= NULL
;
5507 /* Look for legacy symbol. */
5509 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
5510 FALSE
, FALSE
, FALSE
);
5511 if (h
&& (h
->root
.type
== bfd_link_hash_defined
5512 || h
->root
.type
== bfd_link_hash_defweak
)
5514 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
5516 /* The symbol has no type if specified on the command line. */
5517 h
->type
= STT_OBJECT
;
5518 if (info
->stacksize
)
5519 (*_bfd_error_handler
) (_("%B: stack size specified and %s set"),
5520 output_bfd
, legacy_symbol
);
5521 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
5522 (*_bfd_error_handler
) (_("%B: %s not absolute"),
5523 output_bfd
, legacy_symbol
);
5525 info
->stacksize
= h
->root
.u
.def
.value
;
5528 if (!info
->stacksize
)
5529 /* If the user didn't set a size, or explicitly inhibit the
5530 size, set it now. */
5531 info
->stacksize
= default_size
;
5533 /* Provide the legacy symbol, if it is referenced. */
5534 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
5535 || h
->root
.type
== bfd_link_hash_undefweak
))
5537 struct bfd_link_hash_entry
*bh
= NULL
;
5539 if (!(_bfd_generic_link_add_one_symbol
5540 (info
, output_bfd
, legacy_symbol
,
5541 BSF_GLOBAL
, bfd_abs_section_ptr
,
5542 info
->stacksize
>= 0 ? info
->stacksize
: 0,
5543 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
5546 h
= (struct elf_link_hash_entry
*) bh
;
5548 h
->type
= STT_OBJECT
;
5554 /* Set up the sizes and contents of the ELF dynamic sections. This is
5555 called by the ELF linker emulation before_allocation routine. We
5556 must set the sizes of the sections before the linker sets the
5557 addresses of the various sections. */
5560 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5563 const char *filter_shlib
,
5565 const char *depaudit
,
5566 const char * const *auxiliary_filters
,
5567 struct bfd_link_info
*info
,
5568 asection
**sinterpptr
)
5570 bfd_size_type soname_indx
;
5572 const struct elf_backend_data
*bed
;
5573 struct elf_info_failed asvinfo
;
5577 soname_indx
= (bfd_size_type
) -1;
5579 if (!is_elf_hash_table (info
->hash
))
5582 bed
= get_elf_backend_data (output_bfd
);
5584 /* Any syms created from now on start with -1 in
5585 got.refcount/offset and plt.refcount/offset. */
5586 elf_hash_table (info
)->init_got_refcount
5587 = elf_hash_table (info
)->init_got_offset
;
5588 elf_hash_table (info
)->init_plt_refcount
5589 = elf_hash_table (info
)->init_plt_offset
;
5591 if (info
->relocatable
5592 && !_bfd_elf_size_group_sections (info
))
5595 /* The backend may have to create some sections regardless of whether
5596 we're dynamic or not. */
5597 if (bed
->elf_backend_always_size_sections
5598 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5601 /* Determine any GNU_STACK segment requirements, after the backend
5602 has had a chance to set a default segment size. */
5603 if (info
->execstack
)
5604 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
5605 else if (info
->noexecstack
)
5606 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
5610 asection
*notesec
= NULL
;
5613 for (inputobj
= info
->input_bfds
;
5615 inputobj
= inputobj
->link_next
)
5620 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
5622 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5625 if (s
->flags
& SEC_CODE
)
5629 else if (bed
->default_execstack
)
5632 if (notesec
|| info
->stacksize
> 0)
5633 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
5634 if (notesec
&& exec
&& info
->relocatable
5635 && notesec
->output_section
!= bfd_abs_section_ptr
)
5636 notesec
->output_section
->flags
|= SEC_CODE
;
5639 dynobj
= elf_hash_table (info
)->dynobj
;
5641 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
5643 struct elf_info_failed eif
;
5644 struct elf_link_hash_entry
*h
;
5646 struct bfd_elf_version_tree
*t
;
5647 struct bfd_elf_version_expr
*d
;
5649 bfd_boolean all_defined
;
5651 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
5652 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5656 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5658 if (soname_indx
== (bfd_size_type
) -1
5659 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5665 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5667 info
->flags
|= DF_SYMBOLIC
;
5675 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5677 if (indx
== (bfd_size_type
) -1)
5680 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
5681 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
5685 if (filter_shlib
!= NULL
)
5689 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5690 filter_shlib
, TRUE
);
5691 if (indx
== (bfd_size_type
) -1
5692 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5696 if (auxiliary_filters
!= NULL
)
5698 const char * const *p
;
5700 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5704 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5706 if (indx
== (bfd_size_type
) -1
5707 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5716 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
5718 if (indx
== (bfd_size_type
) -1
5719 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
5723 if (depaudit
!= NULL
)
5727 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
5729 if (indx
== (bfd_size_type
) -1
5730 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
5737 /* If we are supposed to export all symbols into the dynamic symbol
5738 table (this is not the normal case), then do so. */
5739 if (info
->export_dynamic
5740 || (info
->executable
&& info
->dynamic
))
5742 elf_link_hash_traverse (elf_hash_table (info
),
5743 _bfd_elf_export_symbol
,
5749 /* Make all global versions with definition. */
5750 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
5751 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5752 if (!d
->symver
&& d
->literal
)
5754 const char *verstr
, *name
;
5755 size_t namelen
, verlen
, newlen
;
5756 char *newname
, *p
, leading_char
;
5757 struct elf_link_hash_entry
*newh
;
5759 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
5761 namelen
= strlen (name
) + (leading_char
!= '\0');
5763 verlen
= strlen (verstr
);
5764 newlen
= namelen
+ verlen
+ 3;
5766 newname
= (char *) bfd_malloc (newlen
);
5767 if (newname
== NULL
)
5769 newname
[0] = leading_char
;
5770 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
5772 /* Check the hidden versioned definition. */
5773 p
= newname
+ namelen
;
5775 memcpy (p
, verstr
, verlen
+ 1);
5776 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5777 newname
, FALSE
, FALSE
,
5780 || (newh
->root
.type
!= bfd_link_hash_defined
5781 && newh
->root
.type
!= bfd_link_hash_defweak
))
5783 /* Check the default versioned definition. */
5785 memcpy (p
, verstr
, verlen
+ 1);
5786 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5787 newname
, FALSE
, FALSE
,
5792 /* Mark this version if there is a definition and it is
5793 not defined in a shared object. */
5795 && !newh
->def_dynamic
5796 && (newh
->root
.type
== bfd_link_hash_defined
5797 || newh
->root
.type
== bfd_link_hash_defweak
))
5801 /* Attach all the symbols to their version information. */
5802 asvinfo
.info
= info
;
5803 asvinfo
.failed
= FALSE
;
5805 elf_link_hash_traverse (elf_hash_table (info
),
5806 _bfd_elf_link_assign_sym_version
,
5811 if (!info
->allow_undefined_version
)
5813 /* Check if all global versions have a definition. */
5815 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
5816 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5817 if (d
->literal
&& !d
->symver
&& !d
->script
)
5819 (*_bfd_error_handler
)
5820 (_("%s: undefined version: %s"),
5821 d
->pattern
, t
->name
);
5822 all_defined
= FALSE
;
5827 bfd_set_error (bfd_error_bad_value
);
5832 /* Find all symbols which were defined in a dynamic object and make
5833 the backend pick a reasonable value for them. */
5834 elf_link_hash_traverse (elf_hash_table (info
),
5835 _bfd_elf_adjust_dynamic_symbol
,
5840 /* Add some entries to the .dynamic section. We fill in some of the
5841 values later, in bfd_elf_final_link, but we must add the entries
5842 now so that we know the final size of the .dynamic section. */
5844 /* If there are initialization and/or finalization functions to
5845 call then add the corresponding DT_INIT/DT_FINI entries. */
5846 h
= (info
->init_function
5847 ? elf_link_hash_lookup (elf_hash_table (info
),
5848 info
->init_function
, FALSE
,
5855 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5858 h
= (info
->fini_function
5859 ? elf_link_hash_lookup (elf_hash_table (info
),
5860 info
->fini_function
, FALSE
,
5867 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5871 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5872 if (s
!= NULL
&& s
->linker_has_input
)
5874 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5875 if (! info
->executable
)
5880 for (sub
= info
->input_bfds
; sub
!= NULL
;
5881 sub
= sub
->link_next
)
5882 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5883 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5884 if (elf_section_data (o
)->this_hdr
.sh_type
5885 == SHT_PREINIT_ARRAY
)
5887 (*_bfd_error_handler
)
5888 (_("%B: .preinit_array section is not allowed in DSO"),
5893 bfd_set_error (bfd_error_nonrepresentable_section
);
5897 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5898 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5901 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5902 if (s
!= NULL
&& s
->linker_has_input
)
5904 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5905 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5908 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5909 if (s
!= NULL
&& s
->linker_has_input
)
5911 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5912 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5916 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
5917 /* If .dynstr is excluded from the link, we don't want any of
5918 these tags. Strictly, we should be checking each section
5919 individually; This quick check covers for the case where
5920 someone does a /DISCARD/ : { *(*) }. */
5921 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5923 bfd_size_type strsize
;
5925 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5926 if ((info
->emit_hash
5927 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5928 || (info
->emit_gnu_hash
5929 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5930 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5931 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5932 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5933 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5934 bed
->s
->sizeof_sym
))
5939 /* The backend must work out the sizes of all the other dynamic
5942 && bed
->elf_backend_size_dynamic_sections
!= NULL
5943 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5946 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5949 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
5951 unsigned long section_sym_count
;
5952 struct bfd_elf_version_tree
*verdefs
;
5955 /* Set up the version definition section. */
5956 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
5957 BFD_ASSERT (s
!= NULL
);
5959 /* We may have created additional version definitions if we are
5960 just linking a regular application. */
5961 verdefs
= info
->version_info
;
5963 /* Skip anonymous version tag. */
5964 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5965 verdefs
= verdefs
->next
;
5967 if (verdefs
== NULL
&& !info
->create_default_symver
)
5968 s
->flags
|= SEC_EXCLUDE
;
5973 struct bfd_elf_version_tree
*t
;
5975 Elf_Internal_Verdef def
;
5976 Elf_Internal_Verdaux defaux
;
5977 struct bfd_link_hash_entry
*bh
;
5978 struct elf_link_hash_entry
*h
;
5984 /* Make space for the base version. */
5985 size
+= sizeof (Elf_External_Verdef
);
5986 size
+= sizeof (Elf_External_Verdaux
);
5989 /* Make space for the default version. */
5990 if (info
->create_default_symver
)
5992 size
+= sizeof (Elf_External_Verdef
);
5996 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5998 struct bfd_elf_version_deps
*n
;
6000 /* Don't emit base version twice. */
6004 size
+= sizeof (Elf_External_Verdef
);
6005 size
+= sizeof (Elf_External_Verdaux
);
6008 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6009 size
+= sizeof (Elf_External_Verdaux
);
6013 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6014 if (s
->contents
== NULL
&& s
->size
!= 0)
6017 /* Fill in the version definition section. */
6021 def
.vd_version
= VER_DEF_CURRENT
;
6022 def
.vd_flags
= VER_FLG_BASE
;
6025 if (info
->create_default_symver
)
6027 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6028 def
.vd_next
= sizeof (Elf_External_Verdef
);
6032 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6033 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6034 + sizeof (Elf_External_Verdaux
));
6037 if (soname_indx
!= (bfd_size_type
) -1)
6039 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6041 def
.vd_hash
= bfd_elf_hash (soname
);
6042 defaux
.vda_name
= soname_indx
;
6049 name
= lbasename (output_bfd
->filename
);
6050 def
.vd_hash
= bfd_elf_hash (name
);
6051 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6053 if (indx
== (bfd_size_type
) -1)
6055 defaux
.vda_name
= indx
;
6057 defaux
.vda_next
= 0;
6059 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6060 (Elf_External_Verdef
*) p
);
6061 p
+= sizeof (Elf_External_Verdef
);
6062 if (info
->create_default_symver
)
6064 /* Add a symbol representing this version. */
6066 if (! (_bfd_generic_link_add_one_symbol
6067 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6069 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6071 h
= (struct elf_link_hash_entry
*) bh
;
6074 h
->type
= STT_OBJECT
;
6075 h
->verinfo
.vertree
= NULL
;
6077 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6080 /* Create a duplicate of the base version with the same
6081 aux block, but different flags. */
6084 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6086 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6087 + sizeof (Elf_External_Verdaux
));
6090 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6091 (Elf_External_Verdef
*) p
);
6092 p
+= sizeof (Elf_External_Verdef
);
6094 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6095 (Elf_External_Verdaux
*) p
);
6096 p
+= sizeof (Elf_External_Verdaux
);
6098 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6101 struct bfd_elf_version_deps
*n
;
6103 /* Don't emit the base version twice. */
6108 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6111 /* Add a symbol representing this version. */
6113 if (! (_bfd_generic_link_add_one_symbol
6114 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6116 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6118 h
= (struct elf_link_hash_entry
*) bh
;
6121 h
->type
= STT_OBJECT
;
6122 h
->verinfo
.vertree
= t
;
6124 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6127 def
.vd_version
= VER_DEF_CURRENT
;
6129 if (t
->globals
.list
== NULL
6130 && t
->locals
.list
== NULL
6132 def
.vd_flags
|= VER_FLG_WEAK
;
6133 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6134 def
.vd_cnt
= cdeps
+ 1;
6135 def
.vd_hash
= bfd_elf_hash (t
->name
);
6136 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6139 /* If a basever node is next, it *must* be the last node in
6140 the chain, otherwise Verdef construction breaks. */
6141 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6142 BFD_ASSERT (t
->next
->next
== NULL
);
6144 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6145 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6146 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6148 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6149 (Elf_External_Verdef
*) p
);
6150 p
+= sizeof (Elf_External_Verdef
);
6152 defaux
.vda_name
= h
->dynstr_index
;
6153 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6155 defaux
.vda_next
= 0;
6156 if (t
->deps
!= NULL
)
6157 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6158 t
->name_indx
= defaux
.vda_name
;
6160 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6161 (Elf_External_Verdaux
*) p
);
6162 p
+= sizeof (Elf_External_Verdaux
);
6164 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6166 if (n
->version_needed
== NULL
)
6168 /* This can happen if there was an error in the
6170 defaux
.vda_name
= 0;
6174 defaux
.vda_name
= n
->version_needed
->name_indx
;
6175 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6178 if (n
->next
== NULL
)
6179 defaux
.vda_next
= 0;
6181 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6183 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6184 (Elf_External_Verdaux
*) p
);
6185 p
+= sizeof (Elf_External_Verdaux
);
6189 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6190 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6193 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6196 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6198 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6201 else if (info
->flags
& DF_BIND_NOW
)
6203 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6209 if (info
->executable
)
6210 info
->flags_1
&= ~ (DF_1_INITFIRST
6213 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6217 /* Work out the size of the version reference section. */
6219 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6220 BFD_ASSERT (s
!= NULL
);
6222 struct elf_find_verdep_info sinfo
;
6225 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6226 if (sinfo
.vers
== 0)
6228 sinfo
.failed
= FALSE
;
6230 elf_link_hash_traverse (elf_hash_table (info
),
6231 _bfd_elf_link_find_version_dependencies
,
6236 if (elf_tdata (output_bfd
)->verref
== NULL
)
6237 s
->flags
|= SEC_EXCLUDE
;
6240 Elf_Internal_Verneed
*t
;
6245 /* Build the version dependency section. */
6248 for (t
= elf_tdata (output_bfd
)->verref
;
6252 Elf_Internal_Vernaux
*a
;
6254 size
+= sizeof (Elf_External_Verneed
);
6256 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6257 size
+= sizeof (Elf_External_Vernaux
);
6261 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6262 if (s
->contents
== NULL
)
6266 for (t
= elf_tdata (output_bfd
)->verref
;
6271 Elf_Internal_Vernaux
*a
;
6275 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6278 t
->vn_version
= VER_NEED_CURRENT
;
6280 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6281 elf_dt_name (t
->vn_bfd
) != NULL
6282 ? elf_dt_name (t
->vn_bfd
)
6283 : lbasename (t
->vn_bfd
->filename
),
6285 if (indx
== (bfd_size_type
) -1)
6288 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6289 if (t
->vn_nextref
== NULL
)
6292 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6293 + caux
* sizeof (Elf_External_Vernaux
));
6295 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6296 (Elf_External_Verneed
*) p
);
6297 p
+= sizeof (Elf_External_Verneed
);
6299 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6301 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6302 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6303 a
->vna_nodename
, FALSE
);
6304 if (indx
== (bfd_size_type
) -1)
6307 if (a
->vna_nextptr
== NULL
)
6310 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6312 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6313 (Elf_External_Vernaux
*) p
);
6314 p
+= sizeof (Elf_External_Vernaux
);
6318 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6319 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6322 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6326 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6327 && elf_tdata (output_bfd
)->cverdefs
== 0)
6328 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6329 §ion_sym_count
) == 0)
6331 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
6332 s
->flags
|= SEC_EXCLUDE
;
6338 /* Find the first non-excluded output section. We'll use its
6339 section symbol for some emitted relocs. */
6341 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6345 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6346 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6347 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6349 elf_hash_table (info
)->text_index_section
= s
;
6354 /* Find two non-excluded output sections, one for code, one for data.
6355 We'll use their section symbols for some emitted relocs. */
6357 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6361 /* Data first, since setting text_index_section changes
6362 _bfd_elf_link_omit_section_dynsym. */
6363 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6364 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6365 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6367 elf_hash_table (info
)->data_index_section
= s
;
6371 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6372 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6373 == (SEC_ALLOC
| SEC_READONLY
))
6374 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6376 elf_hash_table (info
)->text_index_section
= s
;
6380 if (elf_hash_table (info
)->text_index_section
== NULL
)
6381 elf_hash_table (info
)->text_index_section
6382 = elf_hash_table (info
)->data_index_section
;
6386 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6388 const struct elf_backend_data
*bed
;
6390 if (!is_elf_hash_table (info
->hash
))
6393 bed
= get_elf_backend_data (output_bfd
);
6394 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6396 if (elf_hash_table (info
)->dynamic_sections_created
)
6400 bfd_size_type dynsymcount
;
6401 unsigned long section_sym_count
;
6402 unsigned int dtagcount
;
6404 dynobj
= elf_hash_table (info
)->dynobj
;
6406 /* Assign dynsym indicies. In a shared library we generate a
6407 section symbol for each output section, which come first.
6408 Next come all of the back-end allocated local dynamic syms,
6409 followed by the rest of the global symbols. */
6411 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6412 §ion_sym_count
);
6414 /* Work out the size of the symbol version section. */
6415 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
6416 BFD_ASSERT (s
!= NULL
);
6417 if (dynsymcount
!= 0
6418 && (s
->flags
& SEC_EXCLUDE
) == 0)
6420 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6421 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6422 if (s
->contents
== NULL
)
6425 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6429 /* Set the size of the .dynsym and .hash sections. We counted
6430 the number of dynamic symbols in elf_link_add_object_symbols.
6431 We will build the contents of .dynsym and .hash when we build
6432 the final symbol table, because until then we do not know the
6433 correct value to give the symbols. We built the .dynstr
6434 section as we went along in elf_link_add_object_symbols. */
6435 s
= bfd_get_linker_section (dynobj
, ".dynsym");
6436 BFD_ASSERT (s
!= NULL
);
6437 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6439 if (dynsymcount
!= 0)
6441 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6442 if (s
->contents
== NULL
)
6445 /* The first entry in .dynsym is a dummy symbol.
6446 Clear all the section syms, in case we don't output them all. */
6447 ++section_sym_count
;
6448 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6451 elf_hash_table (info
)->bucketcount
= 0;
6453 /* Compute the size of the hashing table. As a side effect this
6454 computes the hash values for all the names we export. */
6455 if (info
->emit_hash
)
6457 unsigned long int *hashcodes
;
6458 struct hash_codes_info hashinf
;
6460 unsigned long int nsyms
;
6462 size_t hash_entry_size
;
6464 /* Compute the hash values for all exported symbols. At the same
6465 time store the values in an array so that we could use them for
6467 amt
= dynsymcount
* sizeof (unsigned long int);
6468 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6469 if (hashcodes
== NULL
)
6471 hashinf
.hashcodes
= hashcodes
;
6472 hashinf
.error
= FALSE
;
6474 /* Put all hash values in HASHCODES. */
6475 elf_link_hash_traverse (elf_hash_table (info
),
6476 elf_collect_hash_codes
, &hashinf
);
6483 nsyms
= hashinf
.hashcodes
- hashcodes
;
6485 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6488 if (bucketcount
== 0)
6491 elf_hash_table (info
)->bucketcount
= bucketcount
;
6493 s
= bfd_get_linker_section (dynobj
, ".hash");
6494 BFD_ASSERT (s
!= NULL
);
6495 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6496 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6497 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6498 if (s
->contents
== NULL
)
6501 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6502 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6503 s
->contents
+ hash_entry_size
);
6506 if (info
->emit_gnu_hash
)
6509 unsigned char *contents
;
6510 struct collect_gnu_hash_codes cinfo
;
6514 memset (&cinfo
, 0, sizeof (cinfo
));
6516 /* Compute the hash values for all exported symbols. At the same
6517 time store the values in an array so that we could use them for
6519 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6520 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6521 if (cinfo
.hashcodes
== NULL
)
6524 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6525 cinfo
.min_dynindx
= -1;
6526 cinfo
.output_bfd
= output_bfd
;
6529 /* Put all hash values in HASHCODES. */
6530 elf_link_hash_traverse (elf_hash_table (info
),
6531 elf_collect_gnu_hash_codes
, &cinfo
);
6534 free (cinfo
.hashcodes
);
6539 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6541 if (bucketcount
== 0)
6543 free (cinfo
.hashcodes
);
6547 s
= bfd_get_linker_section (dynobj
, ".gnu.hash");
6548 BFD_ASSERT (s
!= NULL
);
6550 if (cinfo
.nsyms
== 0)
6552 /* Empty .gnu.hash section is special. */
6553 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6554 free (cinfo
.hashcodes
);
6555 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6556 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6557 if (contents
== NULL
)
6559 s
->contents
= contents
;
6560 /* 1 empty bucket. */
6561 bfd_put_32 (output_bfd
, 1, contents
);
6562 /* SYMIDX above the special symbol 0. */
6563 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6564 /* Just one word for bitmask. */
6565 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6566 /* Only hash fn bloom filter. */
6567 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6568 /* No hashes are valid - empty bitmask. */
6569 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6570 /* No hashes in the only bucket. */
6571 bfd_put_32 (output_bfd
, 0,
6572 contents
+ 16 + bed
->s
->arch_size
/ 8);
6576 unsigned long int maskwords
, maskbitslog2
, x
;
6577 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6581 while ((x
>>= 1) != 0)
6583 if (maskbitslog2
< 3)
6585 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6586 maskbitslog2
= maskbitslog2
+ 3;
6588 maskbitslog2
= maskbitslog2
+ 2;
6589 if (bed
->s
->arch_size
== 64)
6591 if (maskbitslog2
== 5)
6597 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6598 cinfo
.shift2
= maskbitslog2
;
6599 cinfo
.maskbits
= 1 << maskbitslog2
;
6600 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6601 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6602 amt
+= maskwords
* sizeof (bfd_vma
);
6603 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6604 if (cinfo
.bitmask
== NULL
)
6606 free (cinfo
.hashcodes
);
6610 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6611 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6612 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6613 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6615 /* Determine how often each hash bucket is used. */
6616 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6617 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6618 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6620 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6621 if (cinfo
.counts
[i
] != 0)
6623 cinfo
.indx
[i
] = cnt
;
6624 cnt
+= cinfo
.counts
[i
];
6626 BFD_ASSERT (cnt
== dynsymcount
);
6627 cinfo
.bucketcount
= bucketcount
;
6628 cinfo
.local_indx
= cinfo
.min_dynindx
;
6630 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6631 s
->size
+= cinfo
.maskbits
/ 8;
6632 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6633 if (contents
== NULL
)
6635 free (cinfo
.bitmask
);
6636 free (cinfo
.hashcodes
);
6640 s
->contents
= contents
;
6641 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6642 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6643 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6644 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6645 contents
+= 16 + cinfo
.maskbits
/ 8;
6647 for (i
= 0; i
< bucketcount
; ++i
)
6649 if (cinfo
.counts
[i
] == 0)
6650 bfd_put_32 (output_bfd
, 0, contents
);
6652 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6656 cinfo
.contents
= contents
;
6658 /* Renumber dynamic symbols, populate .gnu.hash section. */
6659 elf_link_hash_traverse (elf_hash_table (info
),
6660 elf_renumber_gnu_hash_syms
, &cinfo
);
6662 contents
= s
->contents
+ 16;
6663 for (i
= 0; i
< maskwords
; ++i
)
6665 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6667 contents
+= bed
->s
->arch_size
/ 8;
6670 free (cinfo
.bitmask
);
6671 free (cinfo
.hashcodes
);
6675 s
= bfd_get_linker_section (dynobj
, ".dynstr");
6676 BFD_ASSERT (s
!= NULL
);
6678 elf_finalize_dynstr (output_bfd
, info
);
6680 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6682 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6683 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6690 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6693 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6696 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
6697 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
6700 /* Finish SHF_MERGE section merging. */
6703 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6708 if (!is_elf_hash_table (info
->hash
))
6711 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6712 if ((ibfd
->flags
& DYNAMIC
) == 0)
6713 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6714 if ((sec
->flags
& SEC_MERGE
) != 0
6715 && !bfd_is_abs_section (sec
->output_section
))
6717 struct bfd_elf_section_data
*secdata
;
6719 secdata
= elf_section_data (sec
);
6720 if (! _bfd_add_merge_section (abfd
,
6721 &elf_hash_table (info
)->merge_info
,
6722 sec
, &secdata
->sec_info
))
6724 else if (secdata
->sec_info
)
6725 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
6728 if (elf_hash_table (info
)->merge_info
!= NULL
)
6729 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6730 merge_sections_remove_hook
);
6734 /* Create an entry in an ELF linker hash table. */
6736 struct bfd_hash_entry
*
6737 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6738 struct bfd_hash_table
*table
,
6741 /* Allocate the structure if it has not already been allocated by a
6745 entry
= (struct bfd_hash_entry
*)
6746 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6751 /* Call the allocation method of the superclass. */
6752 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6755 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6756 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6758 /* Set local fields. */
6761 ret
->got
= htab
->init_got_refcount
;
6762 ret
->plt
= htab
->init_plt_refcount
;
6763 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6764 - offsetof (struct elf_link_hash_entry
, size
)));
6765 /* Assume that we have been called by a non-ELF symbol reader.
6766 This flag is then reset by the code which reads an ELF input
6767 file. This ensures that a symbol created by a non-ELF symbol
6768 reader will have the flag set correctly. */
6775 /* Copy data from an indirect symbol to its direct symbol, hiding the
6776 old indirect symbol. Also used for copying flags to a weakdef. */
6779 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6780 struct elf_link_hash_entry
*dir
,
6781 struct elf_link_hash_entry
*ind
)
6783 struct elf_link_hash_table
*htab
;
6785 /* Copy down any references that we may have already seen to the
6786 symbol which just became indirect. */
6788 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6789 dir
->ref_regular
|= ind
->ref_regular
;
6790 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6791 dir
->non_got_ref
|= ind
->non_got_ref
;
6792 dir
->needs_plt
|= ind
->needs_plt
;
6793 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6795 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6798 /* Copy over the global and procedure linkage table refcount entries.
6799 These may have been already set up by a check_relocs routine. */
6800 htab
= elf_hash_table (info
);
6801 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6803 if (dir
->got
.refcount
< 0)
6804 dir
->got
.refcount
= 0;
6805 dir
->got
.refcount
+= ind
->got
.refcount
;
6806 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6809 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6811 if (dir
->plt
.refcount
< 0)
6812 dir
->plt
.refcount
= 0;
6813 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6814 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6817 if (ind
->dynindx
!= -1)
6819 if (dir
->dynindx
!= -1)
6820 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6821 dir
->dynindx
= ind
->dynindx
;
6822 dir
->dynstr_index
= ind
->dynstr_index
;
6824 ind
->dynstr_index
= 0;
6829 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6830 struct elf_link_hash_entry
*h
,
6831 bfd_boolean force_local
)
6833 /* STT_GNU_IFUNC symbol must go through PLT. */
6834 if (h
->type
!= STT_GNU_IFUNC
)
6836 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6841 h
->forced_local
= 1;
6842 if (h
->dynindx
!= -1)
6845 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6851 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6855 _bfd_elf_link_hash_table_init
6856 (struct elf_link_hash_table
*table
,
6858 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6859 struct bfd_hash_table
*,
6861 unsigned int entsize
,
6862 enum elf_target_id target_id
)
6865 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6867 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6868 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6869 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6870 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6871 /* The first dynamic symbol is a dummy. */
6872 table
->dynsymcount
= 1;
6874 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6876 table
->root
.type
= bfd_link_elf_hash_table
;
6877 table
->hash_table_id
= target_id
;
6882 /* Create an ELF linker hash table. */
6884 struct bfd_link_hash_table
*
6885 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6887 struct elf_link_hash_table
*ret
;
6888 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6890 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
6894 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6895 sizeof (struct elf_link_hash_entry
),
6905 /* Destroy an ELF linker hash table. */
6908 _bfd_elf_link_hash_table_free (struct bfd_link_hash_table
*hash
)
6910 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) hash
;
6911 if (htab
->dynstr
!= NULL
)
6912 _bfd_elf_strtab_free (htab
->dynstr
);
6913 _bfd_merge_sections_free (htab
->merge_info
);
6914 _bfd_generic_link_hash_table_free (hash
);
6917 /* This is a hook for the ELF emulation code in the generic linker to
6918 tell the backend linker what file name to use for the DT_NEEDED
6919 entry for a dynamic object. */
6922 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6924 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6925 && bfd_get_format (abfd
) == bfd_object
)
6926 elf_dt_name (abfd
) = name
;
6930 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6933 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6934 && bfd_get_format (abfd
) == bfd_object
)
6935 lib_class
= elf_dyn_lib_class (abfd
);
6942 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6944 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6945 && bfd_get_format (abfd
) == bfd_object
)
6946 elf_dyn_lib_class (abfd
) = lib_class
;
6949 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6950 the linker ELF emulation code. */
6952 struct bfd_link_needed_list
*
6953 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6954 struct bfd_link_info
*info
)
6956 if (! is_elf_hash_table (info
->hash
))
6958 return elf_hash_table (info
)->needed
;
6961 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6962 hook for the linker ELF emulation code. */
6964 struct bfd_link_needed_list
*
6965 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6966 struct bfd_link_info
*info
)
6968 if (! is_elf_hash_table (info
->hash
))
6970 return elf_hash_table (info
)->runpath
;
6973 /* Get the name actually used for a dynamic object for a link. This
6974 is the SONAME entry if there is one. Otherwise, it is the string
6975 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6978 bfd_elf_get_dt_soname (bfd
*abfd
)
6980 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6981 && bfd_get_format (abfd
) == bfd_object
)
6982 return elf_dt_name (abfd
);
6986 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6987 the ELF linker emulation code. */
6990 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6991 struct bfd_link_needed_list
**pneeded
)
6994 bfd_byte
*dynbuf
= NULL
;
6995 unsigned int elfsec
;
6996 unsigned long shlink
;
6997 bfd_byte
*extdyn
, *extdynend
;
6999 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7003 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7004 || bfd_get_format (abfd
) != bfd_object
)
7007 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7008 if (s
== NULL
|| s
->size
== 0)
7011 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7014 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7015 if (elfsec
== SHN_BAD
)
7018 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7020 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7021 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7024 extdynend
= extdyn
+ s
->size
;
7025 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7027 Elf_Internal_Dyn dyn
;
7029 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7031 if (dyn
.d_tag
== DT_NULL
)
7034 if (dyn
.d_tag
== DT_NEEDED
)
7037 struct bfd_link_needed_list
*l
;
7038 unsigned int tagv
= dyn
.d_un
.d_val
;
7041 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7046 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7067 struct elf_symbuf_symbol
7069 unsigned long st_name
; /* Symbol name, index in string tbl */
7070 unsigned char st_info
; /* Type and binding attributes */
7071 unsigned char st_other
; /* Visibilty, and target specific */
7074 struct elf_symbuf_head
7076 struct elf_symbuf_symbol
*ssym
;
7077 bfd_size_type count
;
7078 unsigned int st_shndx
;
7085 Elf_Internal_Sym
*isym
;
7086 struct elf_symbuf_symbol
*ssym
;
7091 /* Sort references to symbols by ascending section number. */
7094 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7096 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7097 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7099 return s1
->st_shndx
- s2
->st_shndx
;
7103 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7105 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7106 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7107 return strcmp (s1
->name
, s2
->name
);
7110 static struct elf_symbuf_head
*
7111 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
7113 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7114 struct elf_symbuf_symbol
*ssym
;
7115 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7116 bfd_size_type i
, shndx_count
, total_size
;
7118 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7122 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7123 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7124 *ind
++ = &isymbuf
[i
];
7127 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7128 elf_sort_elf_symbol
);
7131 if (indbufend
> indbuf
)
7132 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7133 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7136 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7137 + (indbufend
- indbuf
) * sizeof (*ssym
));
7138 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7139 if (ssymbuf
== NULL
)
7145 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7146 ssymbuf
->ssym
= NULL
;
7147 ssymbuf
->count
= shndx_count
;
7148 ssymbuf
->st_shndx
= 0;
7149 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7151 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7154 ssymhead
->ssym
= ssym
;
7155 ssymhead
->count
= 0;
7156 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7158 ssym
->st_name
= (*ind
)->st_name
;
7159 ssym
->st_info
= (*ind
)->st_info
;
7160 ssym
->st_other
= (*ind
)->st_other
;
7163 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7164 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7171 /* Check if 2 sections define the same set of local and global
7175 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7176 struct bfd_link_info
*info
)
7179 const struct elf_backend_data
*bed1
, *bed2
;
7180 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7181 bfd_size_type symcount1
, symcount2
;
7182 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7183 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7184 Elf_Internal_Sym
*isym
, *isymend
;
7185 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7186 bfd_size_type count1
, count2
, i
;
7187 unsigned int shndx1
, shndx2
;
7193 /* Both sections have to be in ELF. */
7194 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7195 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7198 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7201 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7202 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7203 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7206 bed1
= get_elf_backend_data (bfd1
);
7207 bed2
= get_elf_backend_data (bfd2
);
7208 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7209 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7210 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7211 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7213 if (symcount1
== 0 || symcount2
== 0)
7219 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7220 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7222 if (ssymbuf1
== NULL
)
7224 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7226 if (isymbuf1
== NULL
)
7229 if (!info
->reduce_memory_overheads
)
7230 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7231 = elf_create_symbuf (symcount1
, isymbuf1
);
7234 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7236 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7238 if (isymbuf2
== NULL
)
7241 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7242 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7243 = elf_create_symbuf (symcount2
, isymbuf2
);
7246 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7248 /* Optimized faster version. */
7249 bfd_size_type lo
, hi
, mid
;
7250 struct elf_symbol
*symp
;
7251 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7254 hi
= ssymbuf1
->count
;
7259 mid
= (lo
+ hi
) / 2;
7260 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7262 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7266 count1
= ssymbuf1
[mid
].count
;
7273 hi
= ssymbuf2
->count
;
7278 mid
= (lo
+ hi
) / 2;
7279 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7281 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7285 count2
= ssymbuf2
[mid
].count
;
7291 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7294 symtable1
= (struct elf_symbol
*)
7295 bfd_malloc (count1
* sizeof (struct elf_symbol
));
7296 symtable2
= (struct elf_symbol
*)
7297 bfd_malloc (count2
* sizeof (struct elf_symbol
));
7298 if (symtable1
== NULL
|| symtable2
== NULL
)
7302 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7303 ssym
< ssymend
; ssym
++, symp
++)
7305 symp
->u
.ssym
= ssym
;
7306 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7312 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7313 ssym
< ssymend
; ssym
++, symp
++)
7315 symp
->u
.ssym
= ssym
;
7316 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7321 /* Sort symbol by name. */
7322 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7323 elf_sym_name_compare
);
7324 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7325 elf_sym_name_compare
);
7327 for (i
= 0; i
< count1
; i
++)
7328 /* Two symbols must have the same binding, type and name. */
7329 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7330 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7331 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7338 symtable1
= (struct elf_symbol
*)
7339 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7340 symtable2
= (struct elf_symbol
*)
7341 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7342 if (symtable1
== NULL
|| symtable2
== NULL
)
7345 /* Count definitions in the section. */
7347 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7348 if (isym
->st_shndx
== shndx1
)
7349 symtable1
[count1
++].u
.isym
= isym
;
7352 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7353 if (isym
->st_shndx
== shndx2
)
7354 symtable2
[count2
++].u
.isym
= isym
;
7356 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7359 for (i
= 0; i
< count1
; i
++)
7361 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7362 symtable1
[i
].u
.isym
->st_name
);
7364 for (i
= 0; i
< count2
; i
++)
7366 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7367 symtable2
[i
].u
.isym
->st_name
);
7369 /* Sort symbol by name. */
7370 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7371 elf_sym_name_compare
);
7372 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7373 elf_sym_name_compare
);
7375 for (i
= 0; i
< count1
; i
++)
7376 /* Two symbols must have the same binding, type and name. */
7377 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7378 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7379 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7397 /* Return TRUE if 2 section types are compatible. */
7400 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7401 bfd
*bbfd
, const asection
*bsec
)
7405 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7406 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7409 return elf_section_type (asec
) == elf_section_type (bsec
);
7412 /* Final phase of ELF linker. */
7414 /* A structure we use to avoid passing large numbers of arguments. */
7416 struct elf_final_link_info
7418 /* General link information. */
7419 struct bfd_link_info
*info
;
7422 /* Symbol string table. */
7423 struct bfd_strtab_hash
*symstrtab
;
7424 /* .dynsym section. */
7425 asection
*dynsym_sec
;
7426 /* .hash section. */
7428 /* symbol version section (.gnu.version). */
7429 asection
*symver_sec
;
7430 /* Buffer large enough to hold contents of any section. */
7432 /* Buffer large enough to hold external relocs of any section. */
7433 void *external_relocs
;
7434 /* Buffer large enough to hold internal relocs of any section. */
7435 Elf_Internal_Rela
*internal_relocs
;
7436 /* Buffer large enough to hold external local symbols of any input
7438 bfd_byte
*external_syms
;
7439 /* And a buffer for symbol section indices. */
7440 Elf_External_Sym_Shndx
*locsym_shndx
;
7441 /* Buffer large enough to hold internal local symbols of any input
7443 Elf_Internal_Sym
*internal_syms
;
7444 /* Array large enough to hold a symbol index for each local symbol
7445 of any input BFD. */
7447 /* Array large enough to hold a section pointer for each local
7448 symbol of any input BFD. */
7449 asection
**sections
;
7450 /* Buffer to hold swapped out symbols. */
7452 /* And one for symbol section indices. */
7453 Elf_External_Sym_Shndx
*symshndxbuf
;
7454 /* Number of swapped out symbols in buffer. */
7455 size_t symbuf_count
;
7456 /* Number of symbols which fit in symbuf. */
7458 /* And same for symshndxbuf. */
7459 size_t shndxbuf_size
;
7460 /* Number of STT_FILE syms seen. */
7461 size_t filesym_count
;
7464 /* This struct is used to pass information to elf_link_output_extsym. */
7466 struct elf_outext_info
7469 bfd_boolean localsyms
;
7470 bfd_boolean need_second_pass
;
7471 bfd_boolean second_pass
;
7472 struct elf_final_link_info
*flinfo
;
7476 /* Support for evaluating a complex relocation.
7478 Complex relocations are generalized, self-describing relocations. The
7479 implementation of them consists of two parts: complex symbols, and the
7480 relocations themselves.
7482 The relocations are use a reserved elf-wide relocation type code (R_RELC
7483 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7484 information (start bit, end bit, word width, etc) into the addend. This
7485 information is extracted from CGEN-generated operand tables within gas.
7487 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7488 internal) representing prefix-notation expressions, including but not
7489 limited to those sorts of expressions normally encoded as addends in the
7490 addend field. The symbol mangling format is:
7493 | <unary-operator> ':' <node>
7494 | <binary-operator> ':' <node> ':' <node>
7497 <literal> := 's' <digits=N> ':' <N character symbol name>
7498 | 'S' <digits=N> ':' <N character section name>
7502 <binary-operator> := as in C
7503 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7506 set_symbol_value (bfd
*bfd_with_globals
,
7507 Elf_Internal_Sym
*isymbuf
,
7512 struct elf_link_hash_entry
**sym_hashes
;
7513 struct elf_link_hash_entry
*h
;
7514 size_t extsymoff
= locsymcount
;
7516 if (symidx
< locsymcount
)
7518 Elf_Internal_Sym
*sym
;
7520 sym
= isymbuf
+ symidx
;
7521 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7523 /* It is a local symbol: move it to the
7524 "absolute" section and give it a value. */
7525 sym
->st_shndx
= SHN_ABS
;
7526 sym
->st_value
= val
;
7529 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7533 /* It is a global symbol: set its link type
7534 to "defined" and give it a value. */
7536 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7537 h
= sym_hashes
[symidx
- extsymoff
];
7538 while (h
->root
.type
== bfd_link_hash_indirect
7539 || h
->root
.type
== bfd_link_hash_warning
)
7540 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7541 h
->root
.type
= bfd_link_hash_defined
;
7542 h
->root
.u
.def
.value
= val
;
7543 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7547 resolve_symbol (const char *name
,
7549 struct elf_final_link_info
*flinfo
,
7551 Elf_Internal_Sym
*isymbuf
,
7554 Elf_Internal_Sym
*sym
;
7555 struct bfd_link_hash_entry
*global_entry
;
7556 const char *candidate
= NULL
;
7557 Elf_Internal_Shdr
*symtab_hdr
;
7560 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7562 for (i
= 0; i
< locsymcount
; ++ i
)
7566 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7569 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7570 symtab_hdr
->sh_link
,
7573 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7574 name
, candidate
, (unsigned long) sym
->st_value
);
7576 if (candidate
&& strcmp (candidate
, name
) == 0)
7578 asection
*sec
= flinfo
->sections
[i
];
7580 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7581 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7583 printf ("Found symbol with value %8.8lx\n",
7584 (unsigned long) *result
);
7590 /* Hmm, haven't found it yet. perhaps it is a global. */
7591 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
7592 FALSE
, FALSE
, TRUE
);
7596 if (global_entry
->type
== bfd_link_hash_defined
7597 || global_entry
->type
== bfd_link_hash_defweak
)
7599 *result
= (global_entry
->u
.def
.value
7600 + global_entry
->u
.def
.section
->output_section
->vma
7601 + global_entry
->u
.def
.section
->output_offset
);
7603 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7604 global_entry
->root
.string
, (unsigned long) *result
);
7613 resolve_section (const char *name
,
7620 for (curr
= sections
; curr
; curr
= curr
->next
)
7621 if (strcmp (curr
->name
, name
) == 0)
7623 *result
= curr
->vma
;
7627 /* Hmm. still haven't found it. try pseudo-section names. */
7628 for (curr
= sections
; curr
; curr
= curr
->next
)
7630 len
= strlen (curr
->name
);
7631 if (len
> strlen (name
))
7634 if (strncmp (curr
->name
, name
, len
) == 0)
7636 if (strncmp (".end", name
+ len
, 4) == 0)
7638 *result
= curr
->vma
+ curr
->size
;
7642 /* Insert more pseudo-section names here, if you like. */
7650 undefined_reference (const char *reftype
, const char *name
)
7652 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7657 eval_symbol (bfd_vma
*result
,
7660 struct elf_final_link_info
*flinfo
,
7662 Elf_Internal_Sym
*isymbuf
,
7671 const char *sym
= *symp
;
7673 bfd_boolean symbol_is_section
= FALSE
;
7678 if (len
< 1 || len
> sizeof (symbuf
))
7680 bfd_set_error (bfd_error_invalid_operation
);
7693 *result
= strtoul (sym
, (char **) symp
, 16);
7697 symbol_is_section
= TRUE
;
7700 symlen
= strtol (sym
, (char **) symp
, 10);
7701 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7703 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7705 bfd_set_error (bfd_error_invalid_operation
);
7709 memcpy (symbuf
, sym
, symlen
);
7710 symbuf
[symlen
] = '\0';
7711 *symp
= sym
+ symlen
;
7713 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7714 the symbol as a section, or vice-versa. so we're pretty liberal in our
7715 interpretation here; section means "try section first", not "must be a
7716 section", and likewise with symbol. */
7718 if (symbol_is_section
)
7720 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
)
7721 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
7722 isymbuf
, locsymcount
))
7724 undefined_reference ("section", symbuf
);
7730 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
7731 isymbuf
, locsymcount
)
7732 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
7735 undefined_reference ("symbol", symbuf
);
7742 /* All that remains are operators. */
7744 #define UNARY_OP(op) \
7745 if (strncmp (sym, #op, strlen (#op)) == 0) \
7747 sym += strlen (#op); \
7751 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7752 isymbuf, locsymcount, signed_p)) \
7755 *result = op ((bfd_signed_vma) a); \
7761 #define BINARY_OP(op) \
7762 if (strncmp (sym, #op, strlen (#op)) == 0) \
7764 sym += strlen (#op); \
7768 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7769 isymbuf, locsymcount, signed_p)) \
7772 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7773 isymbuf, locsymcount, signed_p)) \
7776 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7806 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7807 bfd_set_error (bfd_error_invalid_operation
);
7813 put_value (bfd_vma size
,
7814 unsigned long chunksz
,
7819 location
+= (size
- chunksz
);
7821 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7829 bfd_put_8 (input_bfd
, x
, location
);
7832 bfd_put_16 (input_bfd
, x
, location
);
7835 bfd_put_32 (input_bfd
, x
, location
);
7839 bfd_put_64 (input_bfd
, x
, location
);
7849 get_value (bfd_vma size
,
7850 unsigned long chunksz
,
7857 /* Sanity checks. */
7858 BFD_ASSERT (chunksz
<= sizeof (x
)
7861 && (size
% chunksz
) == 0
7862 && input_bfd
!= NULL
7863 && location
!= NULL
);
7865 if (chunksz
== sizeof (x
))
7867 BFD_ASSERT (size
== chunksz
);
7869 /* Make sure that we do not perform an undefined shift operation.
7870 We know that size == chunksz so there will only be one iteration
7871 of the loop below. */
7875 shift
= 8 * chunksz
;
7877 for (; size
; size
-= chunksz
, location
+= chunksz
)
7882 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
7885 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
7888 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
7892 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
7903 decode_complex_addend (unsigned long *start
, /* in bits */
7904 unsigned long *oplen
, /* in bits */
7905 unsigned long *len
, /* in bits */
7906 unsigned long *wordsz
, /* in bytes */
7907 unsigned long *chunksz
, /* in bytes */
7908 unsigned long *lsb0_p
,
7909 unsigned long *signed_p
,
7910 unsigned long *trunc_p
,
7911 unsigned long encoded
)
7913 * start
= encoded
& 0x3F;
7914 * len
= (encoded
>> 6) & 0x3F;
7915 * oplen
= (encoded
>> 12) & 0x3F;
7916 * wordsz
= (encoded
>> 18) & 0xF;
7917 * chunksz
= (encoded
>> 22) & 0xF;
7918 * lsb0_p
= (encoded
>> 27) & 1;
7919 * signed_p
= (encoded
>> 28) & 1;
7920 * trunc_p
= (encoded
>> 29) & 1;
7923 bfd_reloc_status_type
7924 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7925 asection
*input_section ATTRIBUTE_UNUSED
,
7927 Elf_Internal_Rela
*rel
,
7930 bfd_vma shift
, x
, mask
;
7931 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7932 bfd_reloc_status_type r
;
7934 /* Perform this reloc, since it is complex.
7935 (this is not to say that it necessarily refers to a complex
7936 symbol; merely that it is a self-describing CGEN based reloc.
7937 i.e. the addend has the complete reloc information (bit start, end,
7938 word size, etc) encoded within it.). */
7940 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7941 &chunksz
, &lsb0_p
, &signed_p
,
7942 &trunc_p
, rel
->r_addend
);
7944 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7947 shift
= (start
+ 1) - len
;
7949 shift
= (8 * wordsz
) - (start
+ len
);
7951 /* FIXME: octets_per_byte. */
7952 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7955 printf ("Doing complex reloc: "
7956 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7957 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7958 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7959 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7960 oplen
, (unsigned long) x
, (unsigned long) mask
,
7961 (unsigned long) relocation
);
7966 /* Now do an overflow check. */
7967 r
= bfd_check_overflow ((signed_p
7968 ? complain_overflow_signed
7969 : complain_overflow_unsigned
),
7970 len
, 0, (8 * wordsz
),
7974 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7977 printf (" relocation: %8.8lx\n"
7978 " shifted mask: %8.8lx\n"
7979 " shifted/masked reloc: %8.8lx\n"
7980 " result: %8.8lx\n",
7981 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
7982 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
7984 /* FIXME: octets_per_byte. */
7985 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7989 /* When performing a relocatable link, the input relocations are
7990 preserved. But, if they reference global symbols, the indices
7991 referenced must be updated. Update all the relocations found in
7995 elf_link_adjust_relocs (bfd
*abfd
,
7996 struct bfd_elf_section_reloc_data
*reldata
)
7999 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8001 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8002 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8003 bfd_vma r_type_mask
;
8005 unsigned int count
= reldata
->count
;
8006 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
8008 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
8010 swap_in
= bed
->s
->swap_reloc_in
;
8011 swap_out
= bed
->s
->swap_reloc_out
;
8013 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
8015 swap_in
= bed
->s
->swap_reloca_in
;
8016 swap_out
= bed
->s
->swap_reloca_out
;
8021 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
8024 if (bed
->s
->arch_size
== 32)
8031 r_type_mask
= 0xffffffff;
8035 erela
= reldata
->hdr
->contents
;
8036 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
8038 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
8041 if (*rel_hash
== NULL
)
8044 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
8046 (*swap_in
) (abfd
, erela
, irela
);
8047 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
8048 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
8049 | (irela
[j
].r_info
& r_type_mask
));
8050 (*swap_out
) (abfd
, irela
, erela
);
8054 struct elf_link_sort_rela
8060 enum elf_reloc_type_class type
;
8061 /* We use this as an array of size int_rels_per_ext_rel. */
8062 Elf_Internal_Rela rela
[1];
8066 elf_link_sort_cmp1 (const void *A
, const void *B
)
8068 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8069 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8070 int relativea
, relativeb
;
8072 relativea
= a
->type
== reloc_class_relative
;
8073 relativeb
= b
->type
== reloc_class_relative
;
8075 if (relativea
< relativeb
)
8077 if (relativea
> relativeb
)
8079 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
8081 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
8083 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8085 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8091 elf_link_sort_cmp2 (const void *A
, const void *B
)
8093 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8094 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8096 if (a
->type
< b
->type
)
8098 if (a
->type
> b
->type
)
8100 if (a
->u
.offset
< b
->u
.offset
)
8102 if (a
->u
.offset
> b
->u
.offset
)
8104 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8106 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8112 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8114 asection
*dynamic_relocs
;
8117 bfd_size_type count
, size
;
8118 size_t i
, ret
, sort_elt
, ext_size
;
8119 bfd_byte
*sort
, *s_non_relative
, *p
;
8120 struct elf_link_sort_rela
*sq
;
8121 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8122 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8123 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8124 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8125 struct bfd_link_order
*lo
;
8127 bfd_boolean use_rela
;
8129 /* Find a dynamic reloc section. */
8130 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8131 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8132 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8133 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8135 bfd_boolean use_rela_initialised
= FALSE
;
8137 /* This is just here to stop gcc from complaining.
8138 It's initialization checking code is not perfect. */
8141 /* Both sections are present. Examine the sizes
8142 of the indirect sections to help us choose. */
8143 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8144 if (lo
->type
== bfd_indirect_link_order
)
8146 asection
*o
= lo
->u
.indirect
.section
;
8148 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8150 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8151 /* Section size is divisible by both rel and rela sizes.
8152 It is of no help to us. */
8156 /* Section size is only divisible by rela. */
8157 if (use_rela_initialised
&& (use_rela
== FALSE
))
8160 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8161 bfd_set_error (bfd_error_invalid_operation
);
8167 use_rela_initialised
= TRUE
;
8171 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8173 /* Section size is only divisible by rel. */
8174 if (use_rela_initialised
&& (use_rela
== TRUE
))
8177 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8178 bfd_set_error (bfd_error_invalid_operation
);
8184 use_rela_initialised
= TRUE
;
8189 /* The section size is not divisible by either - something is wrong. */
8191 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8192 bfd_set_error (bfd_error_invalid_operation
);
8197 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8198 if (lo
->type
== bfd_indirect_link_order
)
8200 asection
*o
= lo
->u
.indirect
.section
;
8202 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8204 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8205 /* Section size is divisible by both rel and rela sizes.
8206 It is of no help to us. */
8210 /* Section size is only divisible by rela. */
8211 if (use_rela_initialised
&& (use_rela
== FALSE
))
8214 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8215 bfd_set_error (bfd_error_invalid_operation
);
8221 use_rela_initialised
= TRUE
;
8225 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8227 /* Section size is only divisible by rel. */
8228 if (use_rela_initialised
&& (use_rela
== TRUE
))
8231 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8232 bfd_set_error (bfd_error_invalid_operation
);
8238 use_rela_initialised
= TRUE
;
8243 /* The section size is not divisible by either - something is wrong. */
8245 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8246 bfd_set_error (bfd_error_invalid_operation
);
8251 if (! use_rela_initialised
)
8255 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8257 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8264 dynamic_relocs
= rela_dyn
;
8265 ext_size
= bed
->s
->sizeof_rela
;
8266 swap_in
= bed
->s
->swap_reloca_in
;
8267 swap_out
= bed
->s
->swap_reloca_out
;
8271 dynamic_relocs
= rel_dyn
;
8272 ext_size
= bed
->s
->sizeof_rel
;
8273 swap_in
= bed
->s
->swap_reloc_in
;
8274 swap_out
= bed
->s
->swap_reloc_out
;
8278 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8279 if (lo
->type
== bfd_indirect_link_order
)
8280 size
+= lo
->u
.indirect
.section
->size
;
8282 if (size
!= dynamic_relocs
->size
)
8285 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8286 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8288 count
= dynamic_relocs
->size
/ ext_size
;
8291 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8295 (*info
->callbacks
->warning
)
8296 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8300 if (bed
->s
->arch_size
== 32)
8301 r_sym_mask
= ~(bfd_vma
) 0xff;
8303 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8305 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8306 if (lo
->type
== bfd_indirect_link_order
)
8308 bfd_byte
*erel
, *erelend
;
8309 asection
*o
= lo
->u
.indirect
.section
;
8311 if (o
->contents
== NULL
&& o
->size
!= 0)
8313 /* This is a reloc section that is being handled as a normal
8314 section. See bfd_section_from_shdr. We can't combine
8315 relocs in this case. */
8320 erelend
= o
->contents
+ o
->size
;
8321 /* FIXME: octets_per_byte. */
8322 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8324 while (erel
< erelend
)
8326 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8328 (*swap_in
) (abfd
, erel
, s
->rela
);
8329 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
8330 s
->u
.sym_mask
= r_sym_mask
;
8336 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8338 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8340 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8341 if (s
->type
!= reloc_class_relative
)
8347 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8348 for (; i
< count
; i
++, p
+= sort_elt
)
8350 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8351 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8353 sp
->u
.offset
= sq
->rela
->r_offset
;
8356 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8358 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8359 if (lo
->type
== bfd_indirect_link_order
)
8361 bfd_byte
*erel
, *erelend
;
8362 asection
*o
= lo
->u
.indirect
.section
;
8365 erelend
= o
->contents
+ o
->size
;
8366 /* FIXME: octets_per_byte. */
8367 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8368 while (erel
< erelend
)
8370 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8371 (*swap_out
) (abfd
, s
->rela
, erel
);
8378 *psec
= dynamic_relocs
;
8382 /* Flush the output symbols to the file. */
8385 elf_link_flush_output_syms (struct elf_final_link_info
*flinfo
,
8386 const struct elf_backend_data
*bed
)
8388 if (flinfo
->symbuf_count
> 0)
8390 Elf_Internal_Shdr
*hdr
;
8394 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
8395 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8396 amt
= flinfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8397 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) != 0
8398 || bfd_bwrite (flinfo
->symbuf
, amt
, flinfo
->output_bfd
) != amt
)
8401 hdr
->sh_size
+= amt
;
8402 flinfo
->symbuf_count
= 0;
8408 /* Add a symbol to the output symbol table. */
8411 elf_link_output_sym (struct elf_final_link_info
*flinfo
,
8413 Elf_Internal_Sym
*elfsym
,
8414 asection
*input_sec
,
8415 struct elf_link_hash_entry
*h
)
8418 Elf_External_Sym_Shndx
*destshndx
;
8419 int (*output_symbol_hook
)
8420 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8421 struct elf_link_hash_entry
*);
8422 const struct elf_backend_data
*bed
;
8424 bed
= get_elf_backend_data (flinfo
->output_bfd
);
8425 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8426 if (output_symbol_hook
!= NULL
)
8428 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
8433 if (name
== NULL
|| *name
== '\0')
8434 elfsym
->st_name
= 0;
8435 else if (input_sec
->flags
& SEC_EXCLUDE
)
8436 elfsym
->st_name
= 0;
8439 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (flinfo
->symstrtab
,
8441 if (elfsym
->st_name
== (unsigned long) -1)
8445 if (flinfo
->symbuf_count
>= flinfo
->symbuf_size
)
8447 if (! elf_link_flush_output_syms (flinfo
, bed
))
8451 dest
= flinfo
->symbuf
+ flinfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8452 destshndx
= flinfo
->symshndxbuf
;
8453 if (destshndx
!= NULL
)
8455 if (bfd_get_symcount (flinfo
->output_bfd
) >= flinfo
->shndxbuf_size
)
8459 amt
= flinfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8460 destshndx
= (Elf_External_Sym_Shndx
*) bfd_realloc (destshndx
,
8462 if (destshndx
== NULL
)
8464 flinfo
->symshndxbuf
= destshndx
;
8465 memset ((char *) destshndx
+ amt
, 0, amt
);
8466 flinfo
->shndxbuf_size
*= 2;
8468 destshndx
+= bfd_get_symcount (flinfo
->output_bfd
);
8471 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, elfsym
, dest
, destshndx
);
8472 flinfo
->symbuf_count
+= 1;
8473 bfd_get_symcount (flinfo
->output_bfd
) += 1;
8478 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8481 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8483 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8484 && sym
->st_shndx
< SHN_LORESERVE
)
8486 /* The gABI doesn't support dynamic symbols in output sections
8488 (*_bfd_error_handler
)
8489 (_("%B: Too many sections: %d (>= %d)"),
8490 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8491 bfd_set_error (bfd_error_nonrepresentable_section
);
8497 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8498 allowing an unsatisfied unversioned symbol in the DSO to match a
8499 versioned symbol that would normally require an explicit version.
8500 We also handle the case that a DSO references a hidden symbol
8501 which may be satisfied by a versioned symbol in another DSO. */
8504 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8505 const struct elf_backend_data
*bed
,
8506 struct elf_link_hash_entry
*h
)
8509 struct elf_link_loaded_list
*loaded
;
8511 if (!is_elf_hash_table (info
->hash
))
8514 /* Check indirect symbol. */
8515 while (h
->root
.type
== bfd_link_hash_indirect
)
8516 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8518 switch (h
->root
.type
)
8524 case bfd_link_hash_undefined
:
8525 case bfd_link_hash_undefweak
:
8526 abfd
= h
->root
.u
.undef
.abfd
;
8527 if ((abfd
->flags
& DYNAMIC
) == 0
8528 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8532 case bfd_link_hash_defined
:
8533 case bfd_link_hash_defweak
:
8534 abfd
= h
->root
.u
.def
.section
->owner
;
8537 case bfd_link_hash_common
:
8538 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8541 BFD_ASSERT (abfd
!= NULL
);
8543 for (loaded
= elf_hash_table (info
)->loaded
;
8545 loaded
= loaded
->next
)
8548 Elf_Internal_Shdr
*hdr
;
8549 bfd_size_type symcount
;
8550 bfd_size_type extsymcount
;
8551 bfd_size_type extsymoff
;
8552 Elf_Internal_Shdr
*versymhdr
;
8553 Elf_Internal_Sym
*isym
;
8554 Elf_Internal_Sym
*isymend
;
8555 Elf_Internal_Sym
*isymbuf
;
8556 Elf_External_Versym
*ever
;
8557 Elf_External_Versym
*extversym
;
8559 input
= loaded
->abfd
;
8561 /* We check each DSO for a possible hidden versioned definition. */
8563 || (input
->flags
& DYNAMIC
) == 0
8564 || elf_dynversym (input
) == 0)
8567 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8569 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8570 if (elf_bad_symtab (input
))
8572 extsymcount
= symcount
;
8577 extsymcount
= symcount
- hdr
->sh_info
;
8578 extsymoff
= hdr
->sh_info
;
8581 if (extsymcount
== 0)
8584 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8586 if (isymbuf
== NULL
)
8589 /* Read in any version definitions. */
8590 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8591 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
8592 if (extversym
== NULL
)
8595 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8596 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8597 != versymhdr
->sh_size
))
8605 ever
= extversym
+ extsymoff
;
8606 isymend
= isymbuf
+ extsymcount
;
8607 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8610 Elf_Internal_Versym iver
;
8611 unsigned short version_index
;
8613 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8614 || isym
->st_shndx
== SHN_UNDEF
)
8617 name
= bfd_elf_string_from_elf_section (input
,
8620 if (strcmp (name
, h
->root
.root
.string
) != 0)
8623 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8625 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
8627 && h
->forced_local
))
8629 /* If we have a non-hidden versioned sym, then it should
8630 have provided a definition for the undefined sym unless
8631 it is defined in a non-shared object and forced local.
8636 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8637 if (version_index
== 1 || version_index
== 2)
8639 /* This is the base or first version. We can use it. */
8653 /* Add an external symbol to the symbol table. This is called from
8654 the hash table traversal routine. When generating a shared object,
8655 we go through the symbol table twice. The first time we output
8656 anything that might have been forced to local scope in a version
8657 script. The second time we output the symbols that are still
8661 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
8663 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
8664 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
8665 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
8667 Elf_Internal_Sym sym
;
8668 asection
*input_sec
;
8669 const struct elf_backend_data
*bed
;
8673 if (h
->root
.type
== bfd_link_hash_warning
)
8675 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8676 if (h
->root
.type
== bfd_link_hash_new
)
8680 /* Decide whether to output this symbol in this pass. */
8681 if (eoinfo
->localsyms
)
8683 if (!h
->forced_local
)
8685 if (eoinfo
->second_pass
8686 && !((h
->root
.type
== bfd_link_hash_defined
8687 || h
->root
.type
== bfd_link_hash_defweak
)
8688 && h
->root
.u
.def
.section
->output_section
!= NULL
))
8693 if (h
->forced_local
)
8697 bed
= get_elf_backend_data (flinfo
->output_bfd
);
8699 if (h
->root
.type
== bfd_link_hash_undefined
)
8701 /* If we have an undefined symbol reference here then it must have
8702 come from a shared library that is being linked in. (Undefined
8703 references in regular files have already been handled unless
8704 they are in unreferenced sections which are removed by garbage
8706 bfd_boolean ignore_undef
= FALSE
;
8708 /* Some symbols may be special in that the fact that they're
8709 undefined can be safely ignored - let backend determine that. */
8710 if (bed
->elf_backend_ignore_undef_symbol
)
8711 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8713 /* If we are reporting errors for this situation then do so now. */
8716 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
8717 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
8718 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8720 if (!(flinfo
->info
->callbacks
->undefined_symbol
8721 (flinfo
->info
, h
->root
.root
.string
,
8722 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
8724 (flinfo
->info
->unresolved_syms_in_shared_libs
8725 == RM_GENERATE_ERROR
))))
8727 bfd_set_error (bfd_error_bad_value
);
8728 eoinfo
->failed
= TRUE
;
8734 /* We should also warn if a forced local symbol is referenced from
8735 shared libraries. */
8736 if (!flinfo
->info
->relocatable
8737 && flinfo
->info
->executable
8742 && h
->ref_dynamic_nonweak
8743 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
8747 struct elf_link_hash_entry
*hi
= h
;
8749 /* Check indirect symbol. */
8750 while (hi
->root
.type
== bfd_link_hash_indirect
)
8751 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
8753 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
8754 msg
= _("%B: internal symbol `%s' in %B is referenced by DSO");
8755 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
8756 msg
= _("%B: hidden symbol `%s' in %B is referenced by DSO");
8758 msg
= _("%B: local symbol `%s' in %B is referenced by DSO");
8759 def_bfd
= flinfo
->output_bfd
;
8760 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
8761 def_bfd
= hi
->root
.u
.def
.section
->owner
;
8762 (*_bfd_error_handler
) (msg
, flinfo
->output_bfd
, def_bfd
,
8763 h
->root
.root
.string
);
8764 bfd_set_error (bfd_error_bad_value
);
8765 eoinfo
->failed
= TRUE
;
8769 /* We don't want to output symbols that have never been mentioned by
8770 a regular file, or that we have been told to strip. However, if
8771 h->indx is set to -2, the symbol is used by a reloc and we must
8775 else if ((h
->def_dynamic
8777 || h
->root
.type
== bfd_link_hash_new
)
8781 else if (flinfo
->info
->strip
== strip_all
)
8783 else if (flinfo
->info
->strip
== strip_some
8784 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
8785 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8787 else if ((h
->root
.type
== bfd_link_hash_defined
8788 || h
->root
.type
== bfd_link_hash_defweak
)
8789 && ((flinfo
->info
->strip_discarded
8790 && discarded_section (h
->root
.u
.def
.section
))
8791 || (h
->root
.u
.def
.section
->owner
!= NULL
8792 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
8794 else if ((h
->root
.type
== bfd_link_hash_undefined
8795 || h
->root
.type
== bfd_link_hash_undefweak
)
8796 && h
->root
.u
.undef
.abfd
!= NULL
8797 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
8802 /* If we're stripping it, and it's not a dynamic symbol, there's
8803 nothing else to do unless it is a forced local symbol or a
8804 STT_GNU_IFUNC symbol. */
8807 && h
->type
!= STT_GNU_IFUNC
8808 && !h
->forced_local
)
8812 sym
.st_size
= h
->size
;
8813 sym
.st_other
= h
->other
;
8814 if (h
->forced_local
)
8816 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8817 /* Turn off visibility on local symbol. */
8818 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
8820 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8821 else if (h
->unique_global
&& h
->def_regular
)
8822 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, h
->type
);
8823 else if (h
->root
.type
== bfd_link_hash_undefweak
8824 || h
->root
.type
== bfd_link_hash_defweak
)
8825 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8827 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8828 sym
.st_target_internal
= h
->target_internal
;
8830 switch (h
->root
.type
)
8833 case bfd_link_hash_new
:
8834 case bfd_link_hash_warning
:
8838 case bfd_link_hash_undefined
:
8839 case bfd_link_hash_undefweak
:
8840 input_sec
= bfd_und_section_ptr
;
8841 sym
.st_shndx
= SHN_UNDEF
;
8844 case bfd_link_hash_defined
:
8845 case bfd_link_hash_defweak
:
8847 input_sec
= h
->root
.u
.def
.section
;
8848 if (input_sec
->output_section
!= NULL
)
8850 if (eoinfo
->localsyms
&& flinfo
->filesym_count
== 1)
8852 bfd_boolean second_pass_sym
8853 = (input_sec
->owner
== flinfo
->output_bfd
8854 || input_sec
->owner
== NULL
8855 || (input_sec
->flags
& SEC_LINKER_CREATED
) != 0
8856 || (input_sec
->owner
->flags
& BFD_LINKER_CREATED
) != 0);
8858 eoinfo
->need_second_pass
|= second_pass_sym
;
8859 if (eoinfo
->second_pass
!= second_pass_sym
)
8864 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
8865 input_sec
->output_section
);
8866 if (sym
.st_shndx
== SHN_BAD
)
8868 (*_bfd_error_handler
)
8869 (_("%B: could not find output section %A for input section %A"),
8870 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8871 bfd_set_error (bfd_error_nonrepresentable_section
);
8872 eoinfo
->failed
= TRUE
;
8876 /* ELF symbols in relocatable files are section relative,
8877 but in nonrelocatable files they are virtual
8879 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8880 if (!flinfo
->info
->relocatable
)
8882 sym
.st_value
+= input_sec
->output_section
->vma
;
8883 if (h
->type
== STT_TLS
)
8885 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
8886 if (tls_sec
!= NULL
)
8887 sym
.st_value
-= tls_sec
->vma
;
8890 /* The TLS section may have been garbage collected. */
8891 BFD_ASSERT (flinfo
->info
->gc_sections
8892 && !input_sec
->gc_mark
);
8899 BFD_ASSERT (input_sec
->owner
== NULL
8900 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8901 sym
.st_shndx
= SHN_UNDEF
;
8902 input_sec
= bfd_und_section_ptr
;
8907 case bfd_link_hash_common
:
8908 input_sec
= h
->root
.u
.c
.p
->section
;
8909 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8910 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8913 case bfd_link_hash_indirect
:
8914 /* These symbols are created by symbol versioning. They point
8915 to the decorated version of the name. For example, if the
8916 symbol foo@@GNU_1.2 is the default, which should be used when
8917 foo is used with no version, then we add an indirect symbol
8918 foo which points to foo@@GNU_1.2. We ignore these symbols,
8919 since the indirected symbol is already in the hash table. */
8923 /* Give the processor backend a chance to tweak the symbol value,
8924 and also to finish up anything that needs to be done for this
8925 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8926 forced local syms when non-shared is due to a historical quirk.
8927 STT_GNU_IFUNC symbol must go through PLT. */
8928 if ((h
->type
== STT_GNU_IFUNC
8930 && !flinfo
->info
->relocatable
)
8931 || ((h
->dynindx
!= -1
8933 && ((flinfo
->info
->shared
8934 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8935 || h
->root
.type
!= bfd_link_hash_undefweak
))
8936 || !h
->forced_local
)
8937 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
8939 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8940 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
8942 eoinfo
->failed
= TRUE
;
8947 /* If we are marking the symbol as undefined, and there are no
8948 non-weak references to this symbol from a regular object, then
8949 mark the symbol as weak undefined; if there are non-weak
8950 references, mark the symbol as strong. We can't do this earlier,
8951 because it might not be marked as undefined until the
8952 finish_dynamic_symbol routine gets through with it. */
8953 if (sym
.st_shndx
== SHN_UNDEF
8955 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8956 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8959 unsigned int type
= ELF_ST_TYPE (sym
.st_info
);
8961 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8962 if (type
== STT_GNU_IFUNC
)
8965 if (h
->ref_regular_nonweak
)
8966 bindtype
= STB_GLOBAL
;
8968 bindtype
= STB_WEAK
;
8969 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
8972 /* If this is a symbol defined in a dynamic library, don't use the
8973 symbol size from the dynamic library. Relinking an executable
8974 against a new library may introduce gratuitous changes in the
8975 executable's symbols if we keep the size. */
8976 if (sym
.st_shndx
== SHN_UNDEF
8981 /* If a non-weak symbol with non-default visibility is not defined
8982 locally, it is a fatal error. */
8983 if (!flinfo
->info
->relocatable
8984 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8985 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8986 && h
->root
.type
== bfd_link_hash_undefined
8991 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
8992 msg
= _("%B: protected symbol `%s' isn't defined");
8993 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
8994 msg
= _("%B: internal symbol `%s' isn't defined");
8996 msg
= _("%B: hidden symbol `%s' isn't defined");
8997 (*_bfd_error_handler
) (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
8998 bfd_set_error (bfd_error_bad_value
);
8999 eoinfo
->failed
= TRUE
;
9003 /* If this symbol should be put in the .dynsym section, then put it
9004 there now. We already know the symbol index. We also fill in
9005 the entry in the .hash section. */
9006 if (flinfo
->dynsym_sec
!= NULL
9008 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
)
9012 /* Since there is no version information in the dynamic string,
9013 if there is no version info in symbol version section, we will
9014 have a run-time problem. */
9015 if (h
->verinfo
.verdef
== NULL
)
9017 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
9019 if (p
&& p
[1] != '\0')
9021 (*_bfd_error_handler
)
9022 (_("%B: No symbol version section for versioned symbol `%s'"),
9023 flinfo
->output_bfd
, h
->root
.root
.string
);
9024 eoinfo
->failed
= TRUE
;
9029 sym
.st_name
= h
->dynstr_index
;
9030 esym
= flinfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
9031 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
9033 eoinfo
->failed
= TRUE
;
9036 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
9038 if (flinfo
->hash_sec
!= NULL
)
9040 size_t hash_entry_size
;
9041 bfd_byte
*bucketpos
;
9046 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
9047 bucket
= h
->u
.elf_hash_value
% bucketcount
;
9050 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
9051 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
9052 + (bucket
+ 2) * hash_entry_size
);
9053 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
9054 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
9056 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
9057 ((bfd_byte
*) flinfo
->hash_sec
->contents
9058 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
9061 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
9063 Elf_Internal_Versym iversym
;
9064 Elf_External_Versym
*eversym
;
9066 if (!h
->def_regular
)
9068 if (h
->verinfo
.verdef
== NULL
)
9069 iversym
.vs_vers
= 0;
9071 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
9075 if (h
->verinfo
.vertree
== NULL
)
9076 iversym
.vs_vers
= 1;
9078 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
9079 if (flinfo
->info
->create_default_symver
)
9084 iversym
.vs_vers
|= VERSYM_HIDDEN
;
9086 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
9087 eversym
+= h
->dynindx
;
9088 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
9092 /* If we're stripping it, then it was just a dynamic symbol, and
9093 there's nothing else to do. */
9094 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
9097 indx
= bfd_get_symcount (flinfo
->output_bfd
);
9098 ret
= elf_link_output_sym (flinfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
9101 eoinfo
->failed
= TRUE
;
9106 else if (h
->indx
== -2)
9112 /* Return TRUE if special handling is done for relocs in SEC against
9113 symbols defined in discarded sections. */
9116 elf_section_ignore_discarded_relocs (asection
*sec
)
9118 const struct elf_backend_data
*bed
;
9120 switch (sec
->sec_info_type
)
9122 case SEC_INFO_TYPE_STABS
:
9123 case SEC_INFO_TYPE_EH_FRAME
:
9129 bed
= get_elf_backend_data (sec
->owner
);
9130 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
9131 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
9137 /* Return a mask saying how ld should treat relocations in SEC against
9138 symbols defined in discarded sections. If this function returns
9139 COMPLAIN set, ld will issue a warning message. If this function
9140 returns PRETEND set, and the discarded section was link-once and the
9141 same size as the kept link-once section, ld will pretend that the
9142 symbol was actually defined in the kept section. Otherwise ld will
9143 zero the reloc (at least that is the intent, but some cooperation by
9144 the target dependent code is needed, particularly for REL targets). */
9147 _bfd_elf_default_action_discarded (asection
*sec
)
9149 if (sec
->flags
& SEC_DEBUGGING
)
9152 if (strcmp (".eh_frame", sec
->name
) == 0)
9155 if (strcmp (".gcc_except_table", sec
->name
) == 0)
9158 return COMPLAIN
| PRETEND
;
9161 /* Find a match between a section and a member of a section group. */
9164 match_group_member (asection
*sec
, asection
*group
,
9165 struct bfd_link_info
*info
)
9167 asection
*first
= elf_next_in_group (group
);
9168 asection
*s
= first
;
9172 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
9175 s
= elf_next_in_group (s
);
9183 /* Check if the kept section of a discarded section SEC can be used
9184 to replace it. Return the replacement if it is OK. Otherwise return
9188 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9192 kept
= sec
->kept_section
;
9195 if ((kept
->flags
& SEC_GROUP
) != 0)
9196 kept
= match_group_member (sec
, kept
, info
);
9198 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9199 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9201 sec
->kept_section
= kept
;
9206 /* Link an input file into the linker output file. This function
9207 handles all the sections and relocations of the input file at once.
9208 This is so that we only have to read the local symbols once, and
9209 don't have to keep them in memory. */
9212 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
9214 int (*relocate_section
)
9215 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9216 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9218 Elf_Internal_Shdr
*symtab_hdr
;
9221 Elf_Internal_Sym
*isymbuf
;
9222 Elf_Internal_Sym
*isym
;
9223 Elf_Internal_Sym
*isymend
;
9225 asection
**ppsection
;
9227 const struct elf_backend_data
*bed
;
9228 struct elf_link_hash_entry
**sym_hashes
;
9229 bfd_size_type address_size
;
9230 bfd_vma r_type_mask
;
9232 bfd_boolean have_file_sym
= FALSE
;
9234 output_bfd
= flinfo
->output_bfd
;
9235 bed
= get_elf_backend_data (output_bfd
);
9236 relocate_section
= bed
->elf_backend_relocate_section
;
9238 /* If this is a dynamic object, we don't want to do anything here:
9239 we don't want the local symbols, and we don't want the section
9241 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9244 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9245 if (elf_bad_symtab (input_bfd
))
9247 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9252 locsymcount
= symtab_hdr
->sh_info
;
9253 extsymoff
= symtab_hdr
->sh_info
;
9256 /* Read the local symbols. */
9257 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9258 if (isymbuf
== NULL
&& locsymcount
!= 0)
9260 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9261 flinfo
->internal_syms
,
9262 flinfo
->external_syms
,
9263 flinfo
->locsym_shndx
);
9264 if (isymbuf
== NULL
)
9268 /* Find local symbol sections and adjust values of symbols in
9269 SEC_MERGE sections. Write out those local symbols we know are
9270 going into the output file. */
9271 isymend
= isymbuf
+ locsymcount
;
9272 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
9274 isym
++, pindex
++, ppsection
++)
9278 Elf_Internal_Sym osym
;
9284 if (elf_bad_symtab (input_bfd
))
9286 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9293 if (isym
->st_shndx
== SHN_UNDEF
)
9294 isec
= bfd_und_section_ptr
;
9295 else if (isym
->st_shndx
== SHN_ABS
)
9296 isec
= bfd_abs_section_ptr
;
9297 else if (isym
->st_shndx
== SHN_COMMON
)
9298 isec
= bfd_com_section_ptr
;
9301 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9304 /* Don't attempt to output symbols with st_shnx in the
9305 reserved range other than SHN_ABS and SHN_COMMON. */
9309 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
9310 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9312 _bfd_merged_section_offset (output_bfd
, &isec
,
9313 elf_section_data (isec
)->sec_info
,
9319 /* Don't output the first, undefined, symbol. */
9320 if (ppsection
== flinfo
->sections
)
9323 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9325 /* We never output section symbols. Instead, we use the
9326 section symbol of the corresponding section in the output
9331 /* If we are stripping all symbols, we don't want to output this
9333 if (flinfo
->info
->strip
== strip_all
)
9336 /* If we are discarding all local symbols, we don't want to
9337 output this one. If we are generating a relocatable output
9338 file, then some of the local symbols may be required by
9339 relocs; we output them below as we discover that they are
9341 if (flinfo
->info
->discard
== discard_all
)
9344 /* If this symbol is defined in a section which we are
9345 discarding, we don't need to keep it. */
9346 if (isym
->st_shndx
!= SHN_UNDEF
9347 && isym
->st_shndx
< SHN_LORESERVE
9348 && bfd_section_removed_from_list (output_bfd
,
9349 isec
->output_section
))
9352 /* Get the name of the symbol. */
9353 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9358 /* See if we are discarding symbols with this name. */
9359 if ((flinfo
->info
->strip
== strip_some
9360 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9362 || (((flinfo
->info
->discard
== discard_sec_merge
9363 && (isec
->flags
& SEC_MERGE
) && !flinfo
->info
->relocatable
)
9364 || flinfo
->info
->discard
== discard_l
)
9365 && bfd_is_local_label_name (input_bfd
, name
)))
9368 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
9370 have_file_sym
= TRUE
;
9371 flinfo
->filesym_count
+= 1;
9375 /* In the absence of debug info, bfd_find_nearest_line uses
9376 FILE symbols to determine the source file for local
9377 function symbols. Provide a FILE symbol here if input
9378 files lack such, so that their symbols won't be
9379 associated with a previous input file. It's not the
9380 source file, but the best we can do. */
9381 have_file_sym
= TRUE
;
9382 flinfo
->filesym_count
+= 1;
9383 memset (&osym
, 0, sizeof (osym
));
9384 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
9385 osym
.st_shndx
= SHN_ABS
;
9386 if (!elf_link_output_sym (flinfo
, input_bfd
->filename
, &osym
,
9387 bfd_abs_section_ptr
, NULL
))
9393 /* Adjust the section index for the output file. */
9394 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9395 isec
->output_section
);
9396 if (osym
.st_shndx
== SHN_BAD
)
9399 /* ELF symbols in relocatable files are section relative, but
9400 in executable files they are virtual addresses. Note that
9401 this code assumes that all ELF sections have an associated
9402 BFD section with a reasonable value for output_offset; below
9403 we assume that they also have a reasonable value for
9404 output_section. Any special sections must be set up to meet
9405 these requirements. */
9406 osym
.st_value
+= isec
->output_offset
;
9407 if (!flinfo
->info
->relocatable
)
9409 osym
.st_value
+= isec
->output_section
->vma
;
9410 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9412 /* STT_TLS symbols are relative to PT_TLS segment base. */
9413 BFD_ASSERT (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
);
9414 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
9418 indx
= bfd_get_symcount (output_bfd
);
9419 ret
= elf_link_output_sym (flinfo
, name
, &osym
, isec
, NULL
);
9426 if (bed
->s
->arch_size
== 32)
9434 r_type_mask
= 0xffffffff;
9439 /* Relocate the contents of each section. */
9440 sym_hashes
= elf_sym_hashes (input_bfd
);
9441 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9445 if (! o
->linker_mark
)
9447 /* This section was omitted from the link. */
9451 if (flinfo
->info
->relocatable
9452 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9454 /* Deal with the group signature symbol. */
9455 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9456 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9457 asection
*osec
= o
->output_section
;
9459 if (symndx
>= locsymcount
9460 || (elf_bad_symtab (input_bfd
)
9461 && flinfo
->sections
[symndx
] == NULL
))
9463 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9464 while (h
->root
.type
== bfd_link_hash_indirect
9465 || h
->root
.type
== bfd_link_hash_warning
)
9466 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9467 /* Arrange for symbol to be output. */
9469 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9471 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9473 /* We'll use the output section target_index. */
9474 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
9475 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9479 if (flinfo
->indices
[symndx
] == -1)
9481 /* Otherwise output the local symbol now. */
9482 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9483 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
9488 name
= bfd_elf_string_from_elf_section (input_bfd
,
9489 symtab_hdr
->sh_link
,
9494 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9496 if (sym
.st_shndx
== SHN_BAD
)
9499 sym
.st_value
+= o
->output_offset
;
9501 indx
= bfd_get_symcount (output_bfd
);
9502 ret
= elf_link_output_sym (flinfo
, name
, &sym
, o
, NULL
);
9506 flinfo
->indices
[symndx
] = indx
;
9510 elf_section_data (osec
)->this_hdr
.sh_info
9511 = flinfo
->indices
[symndx
];
9515 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9516 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9519 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9521 /* Section was created by _bfd_elf_link_create_dynamic_sections
9526 /* Get the contents of the section. They have been cached by a
9527 relaxation routine. Note that o is a section in an input
9528 file, so the contents field will not have been set by any of
9529 the routines which work on output files. */
9530 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9531 contents
= elf_section_data (o
)->this_hdr
.contents
;
9534 contents
= flinfo
->contents
;
9535 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
9539 if ((o
->flags
& SEC_RELOC
) != 0)
9541 Elf_Internal_Rela
*internal_relocs
;
9542 Elf_Internal_Rela
*rel
, *relend
;
9543 int action_discarded
;
9546 /* Get the swapped relocs. */
9548 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
9549 flinfo
->internal_relocs
, FALSE
);
9550 if (internal_relocs
== NULL
9551 && o
->reloc_count
> 0)
9554 /* We need to reverse-copy input .ctors/.dtors sections if
9555 they are placed in .init_array/.finit_array for output. */
9556 if (o
->size
> address_size
9557 && ((strncmp (o
->name
, ".ctors", 6) == 0
9558 && strcmp (o
->output_section
->name
,
9559 ".init_array") == 0)
9560 || (strncmp (o
->name
, ".dtors", 6) == 0
9561 && strcmp (o
->output_section
->name
,
9562 ".fini_array") == 0))
9563 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
9565 if (o
->size
!= o
->reloc_count
* address_size
)
9567 (*_bfd_error_handler
)
9568 (_("error: %B: size of section %A is not "
9569 "multiple of address size"),
9571 bfd_set_error (bfd_error_on_input
);
9574 o
->flags
|= SEC_ELF_REVERSE_COPY
;
9577 action_discarded
= -1;
9578 if (!elf_section_ignore_discarded_relocs (o
))
9579 action_discarded
= (*bed
->action_discarded
) (o
);
9581 /* Run through the relocs evaluating complex reloc symbols and
9582 looking for relocs against symbols from discarded sections
9583 or section symbols from removed link-once sections.
9584 Complain about relocs against discarded sections. Zero
9585 relocs against removed link-once sections. */
9587 rel
= internal_relocs
;
9588 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9589 for ( ; rel
< relend
; rel
++)
9591 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9592 unsigned int s_type
;
9593 asection
**ps
, *sec
;
9594 struct elf_link_hash_entry
*h
= NULL
;
9595 const char *sym_name
;
9597 if (r_symndx
== STN_UNDEF
)
9600 if (r_symndx
>= locsymcount
9601 || (elf_bad_symtab (input_bfd
)
9602 && flinfo
->sections
[r_symndx
] == NULL
))
9604 h
= sym_hashes
[r_symndx
- extsymoff
];
9606 /* Badly formatted input files can contain relocs that
9607 reference non-existant symbols. Check here so that
9608 we do not seg fault. */
9613 sprintf_vma (buffer
, rel
->r_info
);
9614 (*_bfd_error_handler
)
9615 (_("error: %B contains a reloc (0x%s) for section %A "
9616 "that references a non-existent global symbol"),
9617 input_bfd
, o
, buffer
);
9618 bfd_set_error (bfd_error_bad_value
);
9622 while (h
->root
.type
== bfd_link_hash_indirect
9623 || h
->root
.type
== bfd_link_hash_warning
)
9624 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9629 if (h
->root
.type
== bfd_link_hash_defined
9630 || h
->root
.type
== bfd_link_hash_defweak
)
9631 ps
= &h
->root
.u
.def
.section
;
9633 sym_name
= h
->root
.root
.string
;
9637 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9639 s_type
= ELF_ST_TYPE (sym
->st_info
);
9640 ps
= &flinfo
->sections
[r_symndx
];
9641 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9645 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9646 && !flinfo
->info
->relocatable
)
9649 bfd_vma dot
= (rel
->r_offset
9650 + o
->output_offset
+ o
->output_section
->vma
);
9652 printf ("Encountered a complex symbol!");
9653 printf (" (input_bfd %s, section %s, reloc %ld\n",
9654 input_bfd
->filename
, o
->name
,
9655 (long) (rel
- internal_relocs
));
9656 printf (" symbol: idx %8.8lx, name %s\n",
9657 r_symndx
, sym_name
);
9658 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9659 (unsigned long) rel
->r_info
,
9660 (unsigned long) rel
->r_offset
);
9662 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
9663 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9666 /* Symbol evaluated OK. Update to absolute value. */
9667 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9672 if (action_discarded
!= -1 && ps
!= NULL
)
9674 /* Complain if the definition comes from a
9675 discarded section. */
9676 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
9678 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9679 if (action_discarded
& COMPLAIN
)
9680 (*flinfo
->info
->callbacks
->einfo
)
9681 (_("%X`%s' referenced in section `%A' of %B: "
9682 "defined in discarded section `%A' of %B\n"),
9683 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9685 /* Try to do the best we can to support buggy old
9686 versions of gcc. Pretend that the symbol is
9687 really defined in the kept linkonce section.
9688 FIXME: This is quite broken. Modifying the
9689 symbol here means we will be changing all later
9690 uses of the symbol, not just in this section. */
9691 if (action_discarded
& PRETEND
)
9695 kept
= _bfd_elf_check_kept_section (sec
,
9707 /* Relocate the section by invoking a back end routine.
9709 The back end routine is responsible for adjusting the
9710 section contents as necessary, and (if using Rela relocs
9711 and generating a relocatable output file) adjusting the
9712 reloc addend as necessary.
9714 The back end routine does not have to worry about setting
9715 the reloc address or the reloc symbol index.
9717 The back end routine is given a pointer to the swapped in
9718 internal symbols, and can access the hash table entries
9719 for the external symbols via elf_sym_hashes (input_bfd).
9721 When generating relocatable output, the back end routine
9722 must handle STB_LOCAL/STT_SECTION symbols specially. The
9723 output symbol is going to be a section symbol
9724 corresponding to the output section, which will require
9725 the addend to be adjusted. */
9727 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
9728 input_bfd
, o
, contents
,
9736 || flinfo
->info
->relocatable
9737 || flinfo
->info
->emitrelocations
)
9739 Elf_Internal_Rela
*irela
;
9740 Elf_Internal_Rela
*irelaend
, *irelamid
;
9741 bfd_vma last_offset
;
9742 struct elf_link_hash_entry
**rel_hash
;
9743 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
9744 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
9745 unsigned int next_erel
;
9746 bfd_boolean rela_normal
;
9747 struct bfd_elf_section_data
*esdi
, *esdo
;
9749 esdi
= elf_section_data (o
);
9750 esdo
= elf_section_data (o
->output_section
);
9751 rela_normal
= FALSE
;
9753 /* Adjust the reloc addresses and symbol indices. */
9755 irela
= internal_relocs
;
9756 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9757 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
9758 /* We start processing the REL relocs, if any. When we reach
9759 IRELAMID in the loop, we switch to the RELA relocs. */
9761 if (esdi
->rel
.hdr
!= NULL
)
9762 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
9763 * bed
->s
->int_rels_per_ext_rel
);
9764 rel_hash_list
= rel_hash
;
9765 rela_hash_list
= NULL
;
9766 last_offset
= o
->output_offset
;
9767 if (!flinfo
->info
->relocatable
)
9768 last_offset
+= o
->output_section
->vma
;
9769 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9771 unsigned long r_symndx
;
9773 Elf_Internal_Sym sym
;
9775 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9781 if (irela
== irelamid
)
9783 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
9784 rela_hash_list
= rel_hash
;
9785 rela_normal
= bed
->rela_normal
;
9788 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9791 if (irela
->r_offset
>= (bfd_vma
) -2)
9793 /* This is a reloc for a deleted entry or somesuch.
9794 Turn it into an R_*_NONE reloc, at the same
9795 offset as the last reloc. elf_eh_frame.c and
9796 bfd_elf_discard_info rely on reloc offsets
9798 irela
->r_offset
= last_offset
;
9800 irela
->r_addend
= 0;
9804 irela
->r_offset
+= o
->output_offset
;
9806 /* Relocs in an executable have to be virtual addresses. */
9807 if (!flinfo
->info
->relocatable
)
9808 irela
->r_offset
+= o
->output_section
->vma
;
9810 last_offset
= irela
->r_offset
;
9812 r_symndx
= irela
->r_info
>> r_sym_shift
;
9813 if (r_symndx
== STN_UNDEF
)
9816 if (r_symndx
>= locsymcount
9817 || (elf_bad_symtab (input_bfd
)
9818 && flinfo
->sections
[r_symndx
] == NULL
))
9820 struct elf_link_hash_entry
*rh
;
9823 /* This is a reloc against a global symbol. We
9824 have not yet output all the local symbols, so
9825 we do not know the symbol index of any global
9826 symbol. We set the rel_hash entry for this
9827 reloc to point to the global hash table entry
9828 for this symbol. The symbol index is then
9829 set at the end of bfd_elf_final_link. */
9830 indx
= r_symndx
- extsymoff
;
9831 rh
= elf_sym_hashes (input_bfd
)[indx
];
9832 while (rh
->root
.type
== bfd_link_hash_indirect
9833 || rh
->root
.type
== bfd_link_hash_warning
)
9834 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9836 /* Setting the index to -2 tells
9837 elf_link_output_extsym that this symbol is
9839 BFD_ASSERT (rh
->indx
< 0);
9847 /* This is a reloc against a local symbol. */
9850 sym
= isymbuf
[r_symndx
];
9851 sec
= flinfo
->sections
[r_symndx
];
9852 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9854 /* I suppose the backend ought to fill in the
9855 section of any STT_SECTION symbol against a
9856 processor specific section. */
9857 r_symndx
= STN_UNDEF
;
9858 if (bfd_is_abs_section (sec
))
9860 else if (sec
== NULL
|| sec
->owner
== NULL
)
9862 bfd_set_error (bfd_error_bad_value
);
9867 asection
*osec
= sec
->output_section
;
9869 /* If we have discarded a section, the output
9870 section will be the absolute section. In
9871 case of discarded SEC_MERGE sections, use
9872 the kept section. relocate_section should
9873 have already handled discarded linkonce
9875 if (bfd_is_abs_section (osec
)
9876 && sec
->kept_section
!= NULL
9877 && sec
->kept_section
->output_section
!= NULL
)
9879 osec
= sec
->kept_section
->output_section
;
9880 irela
->r_addend
-= osec
->vma
;
9883 if (!bfd_is_abs_section (osec
))
9885 r_symndx
= osec
->target_index
;
9886 if (r_symndx
== STN_UNDEF
)
9888 irela
->r_addend
+= osec
->vma
;
9889 osec
= _bfd_nearby_section (output_bfd
, osec
,
9891 irela
->r_addend
-= osec
->vma
;
9892 r_symndx
= osec
->target_index
;
9897 /* Adjust the addend according to where the
9898 section winds up in the output section. */
9900 irela
->r_addend
+= sec
->output_offset
;
9904 if (flinfo
->indices
[r_symndx
] == -1)
9906 unsigned long shlink
;
9911 if (flinfo
->info
->strip
== strip_all
)
9913 /* You can't do ld -r -s. */
9914 bfd_set_error (bfd_error_invalid_operation
);
9918 /* This symbol was skipped earlier, but
9919 since it is needed by a reloc, we
9920 must output it now. */
9921 shlink
= symtab_hdr
->sh_link
;
9922 name
= (bfd_elf_string_from_elf_section
9923 (input_bfd
, shlink
, sym
.st_name
));
9927 osec
= sec
->output_section
;
9929 _bfd_elf_section_from_bfd_section (output_bfd
,
9931 if (sym
.st_shndx
== SHN_BAD
)
9934 sym
.st_value
+= sec
->output_offset
;
9935 if (!flinfo
->info
->relocatable
)
9937 sym
.st_value
+= osec
->vma
;
9938 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9940 /* STT_TLS symbols are relative to PT_TLS
9942 BFD_ASSERT (elf_hash_table (flinfo
->info
)
9944 sym
.st_value
-= (elf_hash_table (flinfo
->info
)
9949 indx
= bfd_get_symcount (output_bfd
);
9950 ret
= elf_link_output_sym (flinfo
, name
, &sym
, sec
,
9955 flinfo
->indices
[r_symndx
] = indx
;
9960 r_symndx
= flinfo
->indices
[r_symndx
];
9963 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9964 | (irela
->r_info
& r_type_mask
));
9967 /* Swap out the relocs. */
9968 input_rel_hdr
= esdi
->rel
.hdr
;
9969 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
9971 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9976 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9977 * bed
->s
->int_rels_per_ext_rel
);
9978 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9981 input_rela_hdr
= esdi
->rela
.hdr
;
9982 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
9984 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9993 /* Write out the modified section contents. */
9994 if (bed
->elf_backend_write_section
9995 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
9998 /* Section written out. */
10000 else switch (o
->sec_info_type
)
10002 case SEC_INFO_TYPE_STABS
:
10003 if (! (_bfd_write_section_stabs
10005 &elf_hash_table (flinfo
->info
)->stab_info
,
10006 o
, &elf_section_data (o
)->sec_info
, contents
)))
10009 case SEC_INFO_TYPE_MERGE
:
10010 if (! _bfd_write_merged_section (output_bfd
, o
,
10011 elf_section_data (o
)->sec_info
))
10014 case SEC_INFO_TYPE_EH_FRAME
:
10016 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
10023 /* FIXME: octets_per_byte. */
10024 if (! (o
->flags
& SEC_EXCLUDE
))
10026 file_ptr offset
= (file_ptr
) o
->output_offset
;
10027 bfd_size_type todo
= o
->size
;
10028 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
10030 /* Reverse-copy input section to output. */
10033 todo
-= address_size
;
10034 if (! bfd_set_section_contents (output_bfd
,
10042 offset
+= address_size
;
10046 else if (! bfd_set_section_contents (output_bfd
,
10060 /* Generate a reloc when linking an ELF file. This is a reloc
10061 requested by the linker, and does not come from any input file. This
10062 is used to build constructor and destructor tables when linking
10066 elf_reloc_link_order (bfd
*output_bfd
,
10067 struct bfd_link_info
*info
,
10068 asection
*output_section
,
10069 struct bfd_link_order
*link_order
)
10071 reloc_howto_type
*howto
;
10075 struct bfd_elf_section_reloc_data
*reldata
;
10076 struct elf_link_hash_entry
**rel_hash_ptr
;
10077 Elf_Internal_Shdr
*rel_hdr
;
10078 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
10079 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
10082 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
10084 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
10087 bfd_set_error (bfd_error_bad_value
);
10091 addend
= link_order
->u
.reloc
.p
->addend
;
10094 reldata
= &esdo
->rel
;
10095 else if (esdo
->rela
.hdr
)
10096 reldata
= &esdo
->rela
;
10103 /* Figure out the symbol index. */
10104 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
10105 if (link_order
->type
== bfd_section_reloc_link_order
)
10107 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
10108 BFD_ASSERT (indx
!= 0);
10109 *rel_hash_ptr
= NULL
;
10113 struct elf_link_hash_entry
*h
;
10115 /* Treat a reloc against a defined symbol as though it were
10116 actually against the section. */
10117 h
= ((struct elf_link_hash_entry
*)
10118 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
10119 link_order
->u
.reloc
.p
->u
.name
,
10120 FALSE
, FALSE
, TRUE
));
10122 && (h
->root
.type
== bfd_link_hash_defined
10123 || h
->root
.type
== bfd_link_hash_defweak
))
10127 section
= h
->root
.u
.def
.section
;
10128 indx
= section
->output_section
->target_index
;
10129 *rel_hash_ptr
= NULL
;
10130 /* It seems that we ought to add the symbol value to the
10131 addend here, but in practice it has already been added
10132 because it was passed to constructor_callback. */
10133 addend
+= section
->output_section
->vma
+ section
->output_offset
;
10135 else if (h
!= NULL
)
10137 /* Setting the index to -2 tells elf_link_output_extsym that
10138 this symbol is used by a reloc. */
10145 if (! ((*info
->callbacks
->unattached_reloc
)
10146 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
10152 /* If this is an inplace reloc, we must write the addend into the
10154 if (howto
->partial_inplace
&& addend
!= 0)
10156 bfd_size_type size
;
10157 bfd_reloc_status_type rstat
;
10160 const char *sym_name
;
10162 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
10163 buf
= (bfd_byte
*) bfd_zmalloc (size
);
10166 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
10173 case bfd_reloc_outofrange
:
10176 case bfd_reloc_overflow
:
10177 if (link_order
->type
== bfd_section_reloc_link_order
)
10178 sym_name
= bfd_section_name (output_bfd
,
10179 link_order
->u
.reloc
.p
->u
.section
);
10181 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
10182 if (! ((*info
->callbacks
->reloc_overflow
)
10183 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
10184 NULL
, (bfd_vma
) 0)))
10191 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
10192 link_order
->offset
, size
);
10198 /* The address of a reloc is relative to the section in a
10199 relocatable file, and is a virtual address in an executable
10201 offset
= link_order
->offset
;
10202 if (! info
->relocatable
)
10203 offset
+= output_section
->vma
;
10205 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
10207 irel
[i
].r_offset
= offset
;
10208 irel
[i
].r_info
= 0;
10209 irel
[i
].r_addend
= 0;
10211 if (bed
->s
->arch_size
== 32)
10212 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
10214 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
10216 rel_hdr
= reldata
->hdr
;
10217 erel
= rel_hdr
->contents
;
10218 if (rel_hdr
->sh_type
== SHT_REL
)
10220 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
10221 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
10225 irel
[0].r_addend
= addend
;
10226 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
10227 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
10236 /* Get the output vma of the section pointed to by the sh_link field. */
10239 elf_get_linked_section_vma (struct bfd_link_order
*p
)
10241 Elf_Internal_Shdr
**elf_shdrp
;
10245 s
= p
->u
.indirect
.section
;
10246 elf_shdrp
= elf_elfsections (s
->owner
);
10247 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
10248 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
10250 The Intel C compiler generates SHT_IA_64_UNWIND with
10251 SHF_LINK_ORDER. But it doesn't set the sh_link or
10252 sh_info fields. Hence we could get the situation
10253 where elfsec is 0. */
10256 const struct elf_backend_data
*bed
10257 = get_elf_backend_data (s
->owner
);
10258 if (bed
->link_order_error_handler
)
10259 bed
->link_order_error_handler
10260 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10265 s
= elf_shdrp
[elfsec
]->bfd_section
;
10266 return s
->output_section
->vma
+ s
->output_offset
;
10271 /* Compare two sections based on the locations of the sections they are
10272 linked to. Used by elf_fixup_link_order. */
10275 compare_link_order (const void * a
, const void * b
)
10280 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
10281 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
10284 return apos
> bpos
;
10288 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10289 order as their linked sections. Returns false if this could not be done
10290 because an output section includes both ordered and unordered
10291 sections. Ideally we'd do this in the linker proper. */
10294 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
10296 int seen_linkorder
;
10299 struct bfd_link_order
*p
;
10301 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10303 struct bfd_link_order
**sections
;
10304 asection
*s
, *other_sec
, *linkorder_sec
;
10308 linkorder_sec
= NULL
;
10310 seen_linkorder
= 0;
10311 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10313 if (p
->type
== bfd_indirect_link_order
)
10315 s
= p
->u
.indirect
.section
;
10317 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10318 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
10319 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
10320 && elfsec
< elf_numsections (sub
)
10321 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
10322 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
10336 if (seen_other
&& seen_linkorder
)
10338 if (other_sec
&& linkorder_sec
)
10339 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10341 linkorder_sec
->owner
, other_sec
,
10344 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10346 bfd_set_error (bfd_error_bad_value
);
10351 if (!seen_linkorder
)
10354 sections
= (struct bfd_link_order
**)
10355 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10356 if (sections
== NULL
)
10358 seen_linkorder
= 0;
10360 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10362 sections
[seen_linkorder
++] = p
;
10364 /* Sort the input sections in the order of their linked section. */
10365 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10366 compare_link_order
);
10368 /* Change the offsets of the sections. */
10370 for (n
= 0; n
< seen_linkorder
; n
++)
10372 s
= sections
[n
]->u
.indirect
.section
;
10373 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10374 s
->output_offset
= offset
;
10375 sections
[n
]->offset
= offset
;
10376 /* FIXME: octets_per_byte. */
10377 offset
+= sections
[n
]->size
;
10385 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
10389 if (flinfo
->symstrtab
!= NULL
)
10390 _bfd_stringtab_free (flinfo
->symstrtab
);
10391 if (flinfo
->contents
!= NULL
)
10392 free (flinfo
->contents
);
10393 if (flinfo
->external_relocs
!= NULL
)
10394 free (flinfo
->external_relocs
);
10395 if (flinfo
->internal_relocs
!= NULL
)
10396 free (flinfo
->internal_relocs
);
10397 if (flinfo
->external_syms
!= NULL
)
10398 free (flinfo
->external_syms
);
10399 if (flinfo
->locsym_shndx
!= NULL
)
10400 free (flinfo
->locsym_shndx
);
10401 if (flinfo
->internal_syms
!= NULL
)
10402 free (flinfo
->internal_syms
);
10403 if (flinfo
->indices
!= NULL
)
10404 free (flinfo
->indices
);
10405 if (flinfo
->sections
!= NULL
)
10406 free (flinfo
->sections
);
10407 if (flinfo
->symbuf
!= NULL
)
10408 free (flinfo
->symbuf
);
10409 if (flinfo
->symshndxbuf
!= NULL
)
10410 free (flinfo
->symshndxbuf
);
10411 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
10413 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10414 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
10415 free (esdo
->rel
.hashes
);
10416 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
10417 free (esdo
->rela
.hashes
);
10421 /* Do the final step of an ELF link. */
10424 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10426 bfd_boolean dynamic
;
10427 bfd_boolean emit_relocs
;
10429 struct elf_final_link_info flinfo
;
10431 struct bfd_link_order
*p
;
10433 bfd_size_type max_contents_size
;
10434 bfd_size_type max_external_reloc_size
;
10435 bfd_size_type max_internal_reloc_count
;
10436 bfd_size_type max_sym_count
;
10437 bfd_size_type max_sym_shndx_count
;
10439 Elf_Internal_Sym elfsym
;
10441 Elf_Internal_Shdr
*symtab_hdr
;
10442 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10443 Elf_Internal_Shdr
*symstrtab_hdr
;
10444 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10445 struct elf_outext_info eoinfo
;
10446 bfd_boolean merged
;
10447 size_t relativecount
= 0;
10448 asection
*reldyn
= 0;
10450 asection
*attr_section
= NULL
;
10451 bfd_vma attr_size
= 0;
10452 const char *std_attrs_section
;
10454 if (! is_elf_hash_table (info
->hash
))
10458 abfd
->flags
|= DYNAMIC
;
10460 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10461 dynobj
= elf_hash_table (info
)->dynobj
;
10463 emit_relocs
= (info
->relocatable
10464 || info
->emitrelocations
);
10466 flinfo
.info
= info
;
10467 flinfo
.output_bfd
= abfd
;
10468 flinfo
.symstrtab
= _bfd_elf_stringtab_init ();
10469 if (flinfo
.symstrtab
== NULL
)
10474 flinfo
.dynsym_sec
= NULL
;
10475 flinfo
.hash_sec
= NULL
;
10476 flinfo
.symver_sec
= NULL
;
10480 flinfo
.dynsym_sec
= bfd_get_linker_section (dynobj
, ".dynsym");
10481 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
10482 /* Note that dynsym_sec can be NULL (on VMS). */
10483 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
10484 /* Note that it is OK if symver_sec is NULL. */
10487 flinfo
.contents
= NULL
;
10488 flinfo
.external_relocs
= NULL
;
10489 flinfo
.internal_relocs
= NULL
;
10490 flinfo
.external_syms
= NULL
;
10491 flinfo
.locsym_shndx
= NULL
;
10492 flinfo
.internal_syms
= NULL
;
10493 flinfo
.indices
= NULL
;
10494 flinfo
.sections
= NULL
;
10495 flinfo
.symbuf
= NULL
;
10496 flinfo
.symshndxbuf
= NULL
;
10497 flinfo
.symbuf_count
= 0;
10498 flinfo
.shndxbuf_size
= 0;
10499 flinfo
.filesym_count
= 0;
10501 /* The object attributes have been merged. Remove the input
10502 sections from the link, and set the contents of the output
10504 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10505 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10507 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10508 || strcmp (o
->name
, ".gnu.attributes") == 0)
10510 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10512 asection
*input_section
;
10514 if (p
->type
!= bfd_indirect_link_order
)
10516 input_section
= p
->u
.indirect
.section
;
10517 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10518 elf_link_input_bfd ignores this section. */
10519 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10522 attr_size
= bfd_elf_obj_attr_size (abfd
);
10525 bfd_set_section_size (abfd
, o
, attr_size
);
10527 /* Skip this section later on. */
10528 o
->map_head
.link_order
= NULL
;
10531 o
->flags
|= SEC_EXCLUDE
;
10535 /* Count up the number of relocations we will output for each output
10536 section, so that we know the sizes of the reloc sections. We
10537 also figure out some maximum sizes. */
10538 max_contents_size
= 0;
10539 max_external_reloc_size
= 0;
10540 max_internal_reloc_count
= 0;
10542 max_sym_shndx_count
= 0;
10544 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10546 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10547 o
->reloc_count
= 0;
10549 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10551 unsigned int reloc_count
= 0;
10552 struct bfd_elf_section_data
*esdi
= NULL
;
10554 if (p
->type
== bfd_section_reloc_link_order
10555 || p
->type
== bfd_symbol_reloc_link_order
)
10557 else if (p
->type
== bfd_indirect_link_order
)
10561 sec
= p
->u
.indirect
.section
;
10562 esdi
= elf_section_data (sec
);
10564 /* Mark all sections which are to be included in the
10565 link. This will normally be every section. We need
10566 to do this so that we can identify any sections which
10567 the linker has decided to not include. */
10568 sec
->linker_mark
= TRUE
;
10570 if (sec
->flags
& SEC_MERGE
)
10573 if (esdo
->this_hdr
.sh_type
== SHT_REL
10574 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
10575 /* Some backends use reloc_count in relocation sections
10576 to count particular types of relocs. Of course,
10577 reloc sections themselves can't have relocations. */
10579 else if (info
->relocatable
|| info
->emitrelocations
)
10580 reloc_count
= sec
->reloc_count
;
10581 else if (bed
->elf_backend_count_relocs
)
10582 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10584 if (sec
->rawsize
> max_contents_size
)
10585 max_contents_size
= sec
->rawsize
;
10586 if (sec
->size
> max_contents_size
)
10587 max_contents_size
= sec
->size
;
10589 /* We are interested in just local symbols, not all
10591 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10592 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10596 if (elf_bad_symtab (sec
->owner
))
10597 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10598 / bed
->s
->sizeof_sym
);
10600 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10602 if (sym_count
> max_sym_count
)
10603 max_sym_count
= sym_count
;
10605 if (sym_count
> max_sym_shndx_count
10606 && elf_symtab_shndx (sec
->owner
) != 0)
10607 max_sym_shndx_count
= sym_count
;
10609 if ((sec
->flags
& SEC_RELOC
) != 0)
10611 size_t ext_size
= 0;
10613 if (esdi
->rel
.hdr
!= NULL
)
10614 ext_size
= esdi
->rel
.hdr
->sh_size
;
10615 if (esdi
->rela
.hdr
!= NULL
)
10616 ext_size
+= esdi
->rela
.hdr
->sh_size
;
10618 if (ext_size
> max_external_reloc_size
)
10619 max_external_reloc_size
= ext_size
;
10620 if (sec
->reloc_count
> max_internal_reloc_count
)
10621 max_internal_reloc_count
= sec
->reloc_count
;
10626 if (reloc_count
== 0)
10629 o
->reloc_count
+= reloc_count
;
10631 if (p
->type
== bfd_indirect_link_order
10632 && (info
->relocatable
|| info
->emitrelocations
))
10635 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
10636 if (esdi
->rela
.hdr
)
10637 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
10642 esdo
->rela
.count
+= reloc_count
;
10644 esdo
->rel
.count
+= reloc_count
;
10648 if (o
->reloc_count
> 0)
10649 o
->flags
|= SEC_RELOC
;
10652 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10653 set it (this is probably a bug) and if it is set
10654 assign_section_numbers will create a reloc section. */
10655 o
->flags
&=~ SEC_RELOC
;
10658 /* If the SEC_ALLOC flag is not set, force the section VMA to
10659 zero. This is done in elf_fake_sections as well, but forcing
10660 the VMA to 0 here will ensure that relocs against these
10661 sections are handled correctly. */
10662 if ((o
->flags
& SEC_ALLOC
) == 0
10663 && ! o
->user_set_vma
)
10667 if (! info
->relocatable
&& merged
)
10668 elf_link_hash_traverse (elf_hash_table (info
),
10669 _bfd_elf_link_sec_merge_syms
, abfd
);
10671 /* Figure out the file positions for everything but the symbol table
10672 and the relocs. We set symcount to force assign_section_numbers
10673 to create a symbol table. */
10674 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10675 BFD_ASSERT (! abfd
->output_has_begun
);
10676 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10679 /* Set sizes, and assign file positions for reloc sections. */
10680 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10682 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10683 if ((o
->flags
& SEC_RELOC
) != 0)
10686 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
10690 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
10694 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10695 to count upwards while actually outputting the relocations. */
10696 esdo
->rel
.count
= 0;
10697 esdo
->rela
.count
= 0;
10700 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10702 /* We have now assigned file positions for all the sections except
10703 .symtab and .strtab. We start the .symtab section at the current
10704 file position, and write directly to it. We build the .strtab
10705 section in memory. */
10706 bfd_get_symcount (abfd
) = 0;
10707 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10708 /* sh_name is set in prep_headers. */
10709 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10710 /* sh_flags, sh_addr and sh_size all start off zero. */
10711 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10712 /* sh_link is set in assign_section_numbers. */
10713 /* sh_info is set below. */
10714 /* sh_offset is set just below. */
10715 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10717 off
= elf_next_file_pos (abfd
);
10718 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10720 /* Note that at this point elf_next_file_pos (abfd) is
10721 incorrect. We do not yet know the size of the .symtab section.
10722 We correct next_file_pos below, after we do know the size. */
10724 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10725 continuously seeking to the right position in the file. */
10726 if (! info
->keep_memory
|| max_sym_count
< 20)
10727 flinfo
.symbuf_size
= 20;
10729 flinfo
.symbuf_size
= max_sym_count
;
10730 amt
= flinfo
.symbuf_size
;
10731 amt
*= bed
->s
->sizeof_sym
;
10732 flinfo
.symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10733 if (flinfo
.symbuf
== NULL
)
10735 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10737 /* Wild guess at number of output symbols. realloc'd as needed. */
10738 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10739 flinfo
.shndxbuf_size
= amt
;
10740 amt
*= sizeof (Elf_External_Sym_Shndx
);
10741 flinfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10742 if (flinfo
.symshndxbuf
== NULL
)
10746 /* Start writing out the symbol table. The first symbol is always a
10748 if (info
->strip
!= strip_all
10751 elfsym
.st_value
= 0;
10752 elfsym
.st_size
= 0;
10753 elfsym
.st_info
= 0;
10754 elfsym
.st_other
= 0;
10755 elfsym
.st_shndx
= SHN_UNDEF
;
10756 elfsym
.st_target_internal
= 0;
10757 if (elf_link_output_sym (&flinfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10762 /* Output a symbol for each section. We output these even if we are
10763 discarding local symbols, since they are used for relocs. These
10764 symbols have no names. We store the index of each one in the
10765 index field of the section, so that we can find it again when
10766 outputting relocs. */
10767 if (info
->strip
!= strip_all
10770 elfsym
.st_size
= 0;
10771 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10772 elfsym
.st_other
= 0;
10773 elfsym
.st_value
= 0;
10774 elfsym
.st_target_internal
= 0;
10775 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10777 o
= bfd_section_from_elf_index (abfd
, i
);
10780 o
->target_index
= bfd_get_symcount (abfd
);
10781 elfsym
.st_shndx
= i
;
10782 if (!info
->relocatable
)
10783 elfsym
.st_value
= o
->vma
;
10784 if (elf_link_output_sym (&flinfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10790 /* Allocate some memory to hold information read in from the input
10792 if (max_contents_size
!= 0)
10794 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
10795 if (flinfo
.contents
== NULL
)
10799 if (max_external_reloc_size
!= 0)
10801 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10802 if (flinfo
.external_relocs
== NULL
)
10806 if (max_internal_reloc_count
!= 0)
10808 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10809 amt
*= sizeof (Elf_Internal_Rela
);
10810 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
10811 if (flinfo
.internal_relocs
== NULL
)
10815 if (max_sym_count
!= 0)
10817 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10818 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
10819 if (flinfo
.external_syms
== NULL
)
10822 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10823 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
10824 if (flinfo
.internal_syms
== NULL
)
10827 amt
= max_sym_count
* sizeof (long);
10828 flinfo
.indices
= (long int *) bfd_malloc (amt
);
10829 if (flinfo
.indices
== NULL
)
10832 amt
= max_sym_count
* sizeof (asection
*);
10833 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
10834 if (flinfo
.sections
== NULL
)
10838 if (max_sym_shndx_count
!= 0)
10840 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10841 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
10842 if (flinfo
.locsym_shndx
== NULL
)
10846 if (elf_hash_table (info
)->tls_sec
)
10848 bfd_vma base
, end
= 0;
10851 for (sec
= elf_hash_table (info
)->tls_sec
;
10852 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10855 bfd_size_type size
= sec
->size
;
10858 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10860 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
10863 size
= ord
->offset
+ ord
->size
;
10865 end
= sec
->vma
+ size
;
10867 base
= elf_hash_table (info
)->tls_sec
->vma
;
10868 /* Only align end of TLS section if static TLS doesn't have special
10869 alignment requirements. */
10870 if (bed
->static_tls_alignment
== 1)
10871 end
= align_power (end
,
10872 elf_hash_table (info
)->tls_sec
->alignment_power
);
10873 elf_hash_table (info
)->tls_size
= end
- base
;
10876 /* Reorder SHF_LINK_ORDER sections. */
10877 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10879 if (!elf_fixup_link_order (abfd
, o
))
10883 /* Since ELF permits relocations to be against local symbols, we
10884 must have the local symbols available when we do the relocations.
10885 Since we would rather only read the local symbols once, and we
10886 would rather not keep them in memory, we handle all the
10887 relocations for a single input file at the same time.
10889 Unfortunately, there is no way to know the total number of local
10890 symbols until we have seen all of them, and the local symbol
10891 indices precede the global symbol indices. This means that when
10892 we are generating relocatable output, and we see a reloc against
10893 a global symbol, we can not know the symbol index until we have
10894 finished examining all the local symbols to see which ones we are
10895 going to output. To deal with this, we keep the relocations in
10896 memory, and don't output them until the end of the link. This is
10897 an unfortunate waste of memory, but I don't see a good way around
10898 it. Fortunately, it only happens when performing a relocatable
10899 link, which is not the common case. FIXME: If keep_memory is set
10900 we could write the relocs out and then read them again; I don't
10901 know how bad the memory loss will be. */
10903 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10904 sub
->output_has_begun
= FALSE
;
10905 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10907 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10909 if (p
->type
== bfd_indirect_link_order
10910 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10911 == bfd_target_elf_flavour
)
10912 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10914 if (! sub
->output_has_begun
)
10916 if (! elf_link_input_bfd (&flinfo
, sub
))
10918 sub
->output_has_begun
= TRUE
;
10921 else if (p
->type
== bfd_section_reloc_link_order
10922 || p
->type
== bfd_symbol_reloc_link_order
)
10924 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10929 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10931 if (p
->type
== bfd_indirect_link_order
10932 && (bfd_get_flavour (sub
)
10933 == bfd_target_elf_flavour
)
10934 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
10935 != bed
->s
->elfclass
))
10937 const char *iclass
, *oclass
;
10939 if (bed
->s
->elfclass
== ELFCLASS64
)
10941 iclass
= "ELFCLASS32";
10942 oclass
= "ELFCLASS64";
10946 iclass
= "ELFCLASS64";
10947 oclass
= "ELFCLASS32";
10950 bfd_set_error (bfd_error_wrong_format
);
10951 (*_bfd_error_handler
)
10952 (_("%B: file class %s incompatible with %s"),
10953 sub
, iclass
, oclass
);
10962 /* Free symbol buffer if needed. */
10963 if (!info
->reduce_memory_overheads
)
10965 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10966 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10967 && elf_tdata (sub
)->symbuf
)
10969 free (elf_tdata (sub
)->symbuf
);
10970 elf_tdata (sub
)->symbuf
= NULL
;
10974 /* Output a FILE symbol so that following locals are not associated
10975 with the wrong input file. */
10976 memset (&elfsym
, 0, sizeof (elfsym
));
10977 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10978 elfsym
.st_shndx
= SHN_ABS
;
10980 if (flinfo
.filesym_count
> 1
10981 && !elf_link_output_sym (&flinfo
, NULL
, &elfsym
,
10982 bfd_und_section_ptr
, NULL
))
10985 /* Output any global symbols that got converted to local in a
10986 version script or due to symbol visibility. We do this in a
10987 separate step since ELF requires all local symbols to appear
10988 prior to any global symbols. FIXME: We should only do this if
10989 some global symbols were, in fact, converted to become local.
10990 FIXME: Will this work correctly with the Irix 5 linker? */
10991 eoinfo
.failed
= FALSE
;
10992 eoinfo
.flinfo
= &flinfo
;
10993 eoinfo
.localsyms
= TRUE
;
10994 eoinfo
.need_second_pass
= FALSE
;
10995 eoinfo
.second_pass
= FALSE
;
10996 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
11000 if (flinfo
.filesym_count
== 1
11001 && !elf_link_output_sym (&flinfo
, NULL
, &elfsym
,
11002 bfd_und_section_ptr
, NULL
))
11005 if (eoinfo
.need_second_pass
)
11007 eoinfo
.second_pass
= TRUE
;
11008 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
11013 /* If backend needs to output some local symbols not present in the hash
11014 table, do it now. */
11015 if (bed
->elf_backend_output_arch_local_syms
)
11017 typedef int (*out_sym_func
)
11018 (void *, const char *, Elf_Internal_Sym
*, asection
*,
11019 struct elf_link_hash_entry
*);
11021 if (! ((*bed
->elf_backend_output_arch_local_syms
)
11022 (abfd
, info
, &flinfo
, (out_sym_func
) elf_link_output_sym
)))
11026 /* That wrote out all the local symbols. Finish up the symbol table
11027 with the global symbols. Even if we want to strip everything we
11028 can, we still need to deal with those global symbols that got
11029 converted to local in a version script. */
11031 /* The sh_info field records the index of the first non local symbol. */
11032 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
11035 && flinfo
.dynsym_sec
!= NULL
11036 && flinfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
11038 Elf_Internal_Sym sym
;
11039 bfd_byte
*dynsym
= flinfo
.dynsym_sec
->contents
;
11040 long last_local
= 0;
11042 /* Write out the section symbols for the output sections. */
11043 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
11049 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
11051 sym
.st_target_internal
= 0;
11053 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
11059 dynindx
= elf_section_data (s
)->dynindx
;
11062 indx
= elf_section_data (s
)->this_idx
;
11063 BFD_ASSERT (indx
> 0);
11064 sym
.st_shndx
= indx
;
11065 if (! check_dynsym (abfd
, &sym
))
11067 sym
.st_value
= s
->vma
;
11068 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
11069 if (last_local
< dynindx
)
11070 last_local
= dynindx
;
11071 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
11075 /* Write out the local dynsyms. */
11076 if (elf_hash_table (info
)->dynlocal
)
11078 struct elf_link_local_dynamic_entry
*e
;
11079 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
11084 /* Copy the internal symbol and turn off visibility.
11085 Note that we saved a word of storage and overwrote
11086 the original st_name with the dynstr_index. */
11088 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
11090 s
= bfd_section_from_elf_index (e
->input_bfd
,
11095 elf_section_data (s
->output_section
)->this_idx
;
11096 if (! check_dynsym (abfd
, &sym
))
11098 sym
.st_value
= (s
->output_section
->vma
11100 + e
->isym
.st_value
);
11103 if (last_local
< e
->dynindx
)
11104 last_local
= e
->dynindx
;
11106 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
11107 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
11111 elf_section_data (flinfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
11115 /* We get the global symbols from the hash table. */
11116 eoinfo
.failed
= FALSE
;
11117 eoinfo
.localsyms
= FALSE
;
11118 eoinfo
.flinfo
= &flinfo
;
11119 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
11123 /* If backend needs to output some symbols not present in the hash
11124 table, do it now. */
11125 if (bed
->elf_backend_output_arch_syms
)
11127 typedef int (*out_sym_func
)
11128 (void *, const char *, Elf_Internal_Sym
*, asection
*,
11129 struct elf_link_hash_entry
*);
11131 if (! ((*bed
->elf_backend_output_arch_syms
)
11132 (abfd
, info
, &flinfo
, (out_sym_func
) elf_link_output_sym
)))
11136 /* Flush all symbols to the file. */
11137 if (! elf_link_flush_output_syms (&flinfo
, bed
))
11140 /* Now we know the size of the symtab section. */
11141 off
+= symtab_hdr
->sh_size
;
11143 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
11144 if (symtab_shndx_hdr
->sh_name
!= 0)
11146 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
11147 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
11148 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
11149 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
11150 symtab_shndx_hdr
->sh_size
= amt
;
11152 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
11155 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
11156 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
11161 /* Finish up and write out the symbol string table (.strtab)
11163 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
11164 /* sh_name was set in prep_headers. */
11165 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
11166 symstrtab_hdr
->sh_flags
= 0;
11167 symstrtab_hdr
->sh_addr
= 0;
11168 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (flinfo
.symstrtab
);
11169 symstrtab_hdr
->sh_entsize
= 0;
11170 symstrtab_hdr
->sh_link
= 0;
11171 symstrtab_hdr
->sh_info
= 0;
11172 /* sh_offset is set just below. */
11173 symstrtab_hdr
->sh_addralign
= 1;
11175 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
11176 elf_next_file_pos (abfd
) = off
;
11178 if (bfd_get_symcount (abfd
) > 0)
11180 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
11181 || ! _bfd_stringtab_emit (abfd
, flinfo
.symstrtab
))
11185 /* Adjust the relocs to have the correct symbol indices. */
11186 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11188 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11189 if ((o
->flags
& SEC_RELOC
) == 0)
11192 if (esdo
->rel
.hdr
!= NULL
)
11193 elf_link_adjust_relocs (abfd
, &esdo
->rel
);
11194 if (esdo
->rela
.hdr
!= NULL
)
11195 elf_link_adjust_relocs (abfd
, &esdo
->rela
);
11197 /* Set the reloc_count field to 0 to prevent write_relocs from
11198 trying to swap the relocs out itself. */
11199 o
->reloc_count
= 0;
11202 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
11203 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
11205 /* If we are linking against a dynamic object, or generating a
11206 shared library, finish up the dynamic linking information. */
11209 bfd_byte
*dyncon
, *dynconend
;
11211 /* Fix up .dynamic entries. */
11212 o
= bfd_get_linker_section (dynobj
, ".dynamic");
11213 BFD_ASSERT (o
!= NULL
);
11215 dyncon
= o
->contents
;
11216 dynconend
= o
->contents
+ o
->size
;
11217 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11219 Elf_Internal_Dyn dyn
;
11223 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11230 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
11232 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
11234 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
11235 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
11238 dyn
.d_un
.d_val
= relativecount
;
11245 name
= info
->init_function
;
11248 name
= info
->fini_function
;
11251 struct elf_link_hash_entry
*h
;
11253 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
11254 FALSE
, FALSE
, TRUE
);
11256 && (h
->root
.type
== bfd_link_hash_defined
11257 || h
->root
.type
== bfd_link_hash_defweak
))
11259 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
11260 o
= h
->root
.u
.def
.section
;
11261 if (o
->output_section
!= NULL
)
11262 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
11263 + o
->output_offset
);
11266 /* The symbol is imported from another shared
11267 library and does not apply to this one. */
11268 dyn
.d_un
.d_ptr
= 0;
11275 case DT_PREINIT_ARRAYSZ
:
11276 name
= ".preinit_array";
11278 case DT_INIT_ARRAYSZ
:
11279 name
= ".init_array";
11281 case DT_FINI_ARRAYSZ
:
11282 name
= ".fini_array";
11284 o
= bfd_get_section_by_name (abfd
, name
);
11287 (*_bfd_error_handler
)
11288 (_("%B: could not find output section %s"), abfd
, name
);
11292 (*_bfd_error_handler
)
11293 (_("warning: %s section has zero size"), name
);
11294 dyn
.d_un
.d_val
= o
->size
;
11297 case DT_PREINIT_ARRAY
:
11298 name
= ".preinit_array";
11300 case DT_INIT_ARRAY
:
11301 name
= ".init_array";
11303 case DT_FINI_ARRAY
:
11304 name
= ".fini_array";
11311 name
= ".gnu.hash";
11320 name
= ".gnu.version_d";
11323 name
= ".gnu.version_r";
11326 name
= ".gnu.version";
11328 o
= bfd_get_section_by_name (abfd
, name
);
11331 (*_bfd_error_handler
)
11332 (_("%B: could not find output section %s"), abfd
, name
);
11335 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
11337 (*_bfd_error_handler
)
11338 (_("warning: section '%s' is being made into a note"), name
);
11339 bfd_set_error (bfd_error_nonrepresentable_section
);
11342 dyn
.d_un
.d_ptr
= o
->vma
;
11349 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
11353 dyn
.d_un
.d_val
= 0;
11354 dyn
.d_un
.d_ptr
= 0;
11355 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11357 Elf_Internal_Shdr
*hdr
;
11359 hdr
= elf_elfsections (abfd
)[i
];
11360 if (hdr
->sh_type
== type
11361 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
11363 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
11364 dyn
.d_un
.d_val
+= hdr
->sh_size
;
11367 if (dyn
.d_un
.d_ptr
== 0
11368 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
11369 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
11375 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
11379 /* If we have created any dynamic sections, then output them. */
11380 if (dynobj
!= NULL
)
11382 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
11385 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11386 if (((info
->warn_shared_textrel
&& info
->shared
)
11387 || info
->error_textrel
)
11388 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
11390 bfd_byte
*dyncon
, *dynconend
;
11392 dyncon
= o
->contents
;
11393 dynconend
= o
->contents
+ o
->size
;
11394 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11396 Elf_Internal_Dyn dyn
;
11398 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11400 if (dyn
.d_tag
== DT_TEXTREL
)
11402 if (info
->error_textrel
)
11403 info
->callbacks
->einfo
11404 (_("%P%X: read-only segment has dynamic relocations.\n"));
11406 info
->callbacks
->einfo
11407 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11413 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
11415 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11417 || o
->output_section
== bfd_abs_section_ptr
)
11419 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11421 /* At this point, we are only interested in sections
11422 created by _bfd_elf_link_create_dynamic_sections. */
11425 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11427 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11429 if (strcmp (o
->name
, ".dynstr") != 0)
11431 /* FIXME: octets_per_byte. */
11432 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11434 (file_ptr
) o
->output_offset
,
11440 /* The contents of the .dynstr section are actually in a
11442 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11443 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11444 || ! _bfd_elf_strtab_emit (abfd
,
11445 elf_hash_table (info
)->dynstr
))
11451 if (info
->relocatable
)
11453 bfd_boolean failed
= FALSE
;
11455 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11460 /* If we have optimized stabs strings, output them. */
11461 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11463 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11467 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11470 elf_final_link_free (abfd
, &flinfo
);
11472 elf_linker (abfd
) = TRUE
;
11476 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
11477 if (contents
== NULL
)
11478 return FALSE
; /* Bail out and fail. */
11479 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11480 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11487 elf_final_link_free (abfd
, &flinfo
);
11491 /* Initialize COOKIE for input bfd ABFD. */
11494 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11495 struct bfd_link_info
*info
, bfd
*abfd
)
11497 Elf_Internal_Shdr
*symtab_hdr
;
11498 const struct elf_backend_data
*bed
;
11500 bed
= get_elf_backend_data (abfd
);
11501 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11503 cookie
->abfd
= abfd
;
11504 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11505 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11506 if (cookie
->bad_symtab
)
11508 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11509 cookie
->extsymoff
= 0;
11513 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11514 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11517 if (bed
->s
->arch_size
== 32)
11518 cookie
->r_sym_shift
= 8;
11520 cookie
->r_sym_shift
= 32;
11522 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11523 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11525 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11526 cookie
->locsymcount
, 0,
11528 if (cookie
->locsyms
== NULL
)
11530 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11533 if (info
->keep_memory
)
11534 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11539 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11542 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11544 Elf_Internal_Shdr
*symtab_hdr
;
11546 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11547 if (cookie
->locsyms
!= NULL
11548 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11549 free (cookie
->locsyms
);
11552 /* Initialize the relocation information in COOKIE for input section SEC
11553 of input bfd ABFD. */
11556 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11557 struct bfd_link_info
*info
, bfd
*abfd
,
11560 const struct elf_backend_data
*bed
;
11562 if (sec
->reloc_count
== 0)
11564 cookie
->rels
= NULL
;
11565 cookie
->relend
= NULL
;
11569 bed
= get_elf_backend_data (abfd
);
11571 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11572 info
->keep_memory
);
11573 if (cookie
->rels
== NULL
)
11575 cookie
->rel
= cookie
->rels
;
11576 cookie
->relend
= (cookie
->rels
11577 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11579 cookie
->rel
= cookie
->rels
;
11583 /* Free the memory allocated by init_reloc_cookie_rels,
11587 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11590 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11591 free (cookie
->rels
);
11594 /* Initialize the whole of COOKIE for input section SEC. */
11597 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11598 struct bfd_link_info
*info
,
11601 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11603 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11608 fini_reloc_cookie (cookie
, sec
->owner
);
11613 /* Free the memory allocated by init_reloc_cookie_for_section,
11617 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11620 fini_reloc_cookie_rels (cookie
, sec
);
11621 fini_reloc_cookie (cookie
, sec
->owner
);
11624 /* Garbage collect unused sections. */
11626 /* Default gc_mark_hook. */
11629 _bfd_elf_gc_mark_hook (asection
*sec
,
11630 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11631 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11632 struct elf_link_hash_entry
*h
,
11633 Elf_Internal_Sym
*sym
)
11635 const char *sec_name
;
11639 switch (h
->root
.type
)
11641 case bfd_link_hash_defined
:
11642 case bfd_link_hash_defweak
:
11643 return h
->root
.u
.def
.section
;
11645 case bfd_link_hash_common
:
11646 return h
->root
.u
.c
.p
->section
;
11648 case bfd_link_hash_undefined
:
11649 case bfd_link_hash_undefweak
:
11650 /* To work around a glibc bug, keep all XXX input sections
11651 when there is an as yet undefined reference to __start_XXX
11652 or __stop_XXX symbols. The linker will later define such
11653 symbols for orphan input sections that have a name
11654 representable as a C identifier. */
11655 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
11656 sec_name
= h
->root
.root
.string
+ 8;
11657 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
11658 sec_name
= h
->root
.root
.string
+ 7;
11662 if (sec_name
&& *sec_name
!= '\0')
11666 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11668 sec
= bfd_get_section_by_name (i
, sec_name
);
11670 sec
->flags
|= SEC_KEEP
;
11680 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11685 /* COOKIE->rel describes a relocation against section SEC, which is
11686 a section we've decided to keep. Return the section that contains
11687 the relocation symbol, or NULL if no section contains it. */
11690 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11691 elf_gc_mark_hook_fn gc_mark_hook
,
11692 struct elf_reloc_cookie
*cookie
)
11694 unsigned long r_symndx
;
11695 struct elf_link_hash_entry
*h
;
11697 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11698 if (r_symndx
== STN_UNDEF
)
11701 if (r_symndx
>= cookie
->locsymcount
11702 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11704 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11705 while (h
->root
.type
== bfd_link_hash_indirect
11706 || h
->root
.type
== bfd_link_hash_warning
)
11707 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11709 /* If this symbol is weak and there is a non-weak definition, we
11710 keep the non-weak definition because many backends put
11711 dynamic reloc info on the non-weak definition for code
11712 handling copy relocs. */
11713 if (h
->u
.weakdef
!= NULL
)
11714 h
->u
.weakdef
->mark
= 1;
11715 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11718 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11719 &cookie
->locsyms
[r_symndx
]);
11722 /* COOKIE->rel describes a relocation against section SEC, which is
11723 a section we've decided to keep. Mark the section that contains
11724 the relocation symbol. */
11727 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11729 elf_gc_mark_hook_fn gc_mark_hook
,
11730 struct elf_reloc_cookie
*cookie
)
11734 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11735 if (rsec
&& !rsec
->gc_mark
)
11737 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
11738 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
11740 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11746 /* The mark phase of garbage collection. For a given section, mark
11747 it and any sections in this section's group, and all the sections
11748 which define symbols to which it refers. */
11751 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11753 elf_gc_mark_hook_fn gc_mark_hook
)
11756 asection
*group_sec
, *eh_frame
;
11760 /* Mark all the sections in the group. */
11761 group_sec
= elf_section_data (sec
)->next_in_group
;
11762 if (group_sec
&& !group_sec
->gc_mark
)
11763 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11766 /* Look through the section relocs. */
11768 eh_frame
= elf_eh_frame_section (sec
->owner
);
11769 if ((sec
->flags
& SEC_RELOC
) != 0
11770 && sec
->reloc_count
> 0
11771 && sec
!= eh_frame
)
11773 struct elf_reloc_cookie cookie
;
11775 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11779 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11780 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11785 fini_reloc_cookie_for_section (&cookie
, sec
);
11789 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11791 struct elf_reloc_cookie cookie
;
11793 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11797 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11798 gc_mark_hook
, &cookie
))
11800 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11807 /* Keep debug and special sections. */
11810 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
11811 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED
)
11815 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
11818 bfd_boolean some_kept
;
11820 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
11823 /* Ensure all linker created sections are kept, and see whether
11824 any other section is already marked. */
11826 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
11828 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
11830 else if (isec
->gc_mark
)
11834 /* If no section in this file will be kept, then we can
11835 toss out debug sections. */
11839 /* Keep debug and special sections like .comment when they are
11840 not part of a group, or when we have single-member groups. */
11841 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
11842 if ((elf_next_in_group (isec
) == NULL
11843 || elf_next_in_group (isec
) == isec
)
11844 && ((isec
->flags
& SEC_DEBUGGING
) != 0
11845 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0))
11851 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11853 struct elf_gc_sweep_symbol_info
11855 struct bfd_link_info
*info
;
11856 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11861 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11864 && (((h
->root
.type
== bfd_link_hash_defined
11865 || h
->root
.type
== bfd_link_hash_defweak
)
11866 && !(h
->def_regular
11867 && h
->root
.u
.def
.section
->gc_mark
))
11868 || h
->root
.type
== bfd_link_hash_undefined
11869 || h
->root
.type
== bfd_link_hash_undefweak
))
11871 struct elf_gc_sweep_symbol_info
*inf
;
11873 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
11874 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11875 h
->def_regular
= 0;
11876 h
->ref_regular
= 0;
11877 h
->ref_regular_nonweak
= 0;
11883 /* The sweep phase of garbage collection. Remove all garbage sections. */
11885 typedef bfd_boolean (*gc_sweep_hook_fn
)
11886 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11889 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11892 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11893 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11894 unsigned long section_sym_count
;
11895 struct elf_gc_sweep_symbol_info sweep_info
;
11897 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11901 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11904 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11906 /* When any section in a section group is kept, we keep all
11907 sections in the section group. If the first member of
11908 the section group is excluded, we will also exclude the
11910 if (o
->flags
& SEC_GROUP
)
11912 asection
*first
= elf_next_in_group (o
);
11913 o
->gc_mark
= first
->gc_mark
;
11919 /* Skip sweeping sections already excluded. */
11920 if (o
->flags
& SEC_EXCLUDE
)
11923 /* Since this is early in the link process, it is simple
11924 to remove a section from the output. */
11925 o
->flags
|= SEC_EXCLUDE
;
11927 if (info
->print_gc_sections
&& o
->size
!= 0)
11928 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11930 /* But we also have to update some of the relocation
11931 info we collected before. */
11933 && (o
->flags
& SEC_RELOC
) != 0
11934 && o
->reloc_count
> 0
11935 && !bfd_is_abs_section (o
->output_section
))
11937 Elf_Internal_Rela
*internal_relocs
;
11941 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11942 info
->keep_memory
);
11943 if (internal_relocs
== NULL
)
11946 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11948 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11949 free (internal_relocs
);
11957 /* Remove the symbols that were in the swept sections from the dynamic
11958 symbol table. GCFIXME: Anyone know how to get them out of the
11959 static symbol table as well? */
11960 sweep_info
.info
= info
;
11961 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11962 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11965 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11969 /* Propagate collected vtable information. This is called through
11970 elf_link_hash_traverse. */
11973 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11975 /* Those that are not vtables. */
11976 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11979 /* Those vtables that do not have parents, we cannot merge. */
11980 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11983 /* If we've already been done, exit. */
11984 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11987 /* Make sure the parent's table is up to date. */
11988 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11990 if (h
->vtable
->used
== NULL
)
11992 /* None of this table's entries were referenced. Re-use the
11994 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11995 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
12000 bfd_boolean
*cu
, *pu
;
12002 /* Or the parent's entries into ours. */
12003 cu
= h
->vtable
->used
;
12005 pu
= h
->vtable
->parent
->vtable
->used
;
12008 const struct elf_backend_data
*bed
;
12009 unsigned int log_file_align
;
12011 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
12012 log_file_align
= bed
->s
->log_file_align
;
12013 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
12028 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
12031 bfd_vma hstart
, hend
;
12032 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
12033 const struct elf_backend_data
*bed
;
12034 unsigned int log_file_align
;
12036 /* Take care of both those symbols that do not describe vtables as
12037 well as those that are not loaded. */
12038 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
12041 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
12042 || h
->root
.type
== bfd_link_hash_defweak
);
12044 sec
= h
->root
.u
.def
.section
;
12045 hstart
= h
->root
.u
.def
.value
;
12046 hend
= hstart
+ h
->size
;
12048 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
12050 return *(bfd_boolean
*) okp
= FALSE
;
12051 bed
= get_elf_backend_data (sec
->owner
);
12052 log_file_align
= bed
->s
->log_file_align
;
12054 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
12056 for (rel
= relstart
; rel
< relend
; ++rel
)
12057 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
12059 /* If the entry is in use, do nothing. */
12060 if (h
->vtable
->used
12061 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
12063 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
12064 if (h
->vtable
->used
[entry
])
12067 /* Otherwise, kill it. */
12068 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
12074 /* Mark sections containing dynamically referenced symbols. When
12075 building shared libraries, we must assume that any visible symbol is
12079 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
12081 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
12083 if ((h
->root
.type
== bfd_link_hash_defined
12084 || h
->root
.type
== bfd_link_hash_defweak
)
12086 || ((!info
->executable
|| info
->export_dynamic
)
12088 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
12089 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
12090 && (strchr (h
->root
.root
.string
, ELF_VER_CHR
) != NULL
12091 || !bfd_hide_sym_by_version (info
->version_info
,
12092 h
->root
.root
.string
)))))
12093 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
12098 /* Keep all sections containing symbols undefined on the command-line,
12099 and the section containing the entry symbol. */
12102 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
12104 struct bfd_sym_chain
*sym
;
12106 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
12108 struct elf_link_hash_entry
*h
;
12110 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
12111 FALSE
, FALSE
, FALSE
);
12114 && (h
->root
.type
== bfd_link_hash_defined
12115 || h
->root
.type
== bfd_link_hash_defweak
)
12116 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
12117 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
12121 /* Do mark and sweep of unused sections. */
12124 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
12126 bfd_boolean ok
= TRUE
;
12128 elf_gc_mark_hook_fn gc_mark_hook
;
12129 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12131 if (!bed
->can_gc_sections
12132 || !is_elf_hash_table (info
->hash
))
12134 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
12138 bed
->gc_keep (info
);
12140 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12141 at the .eh_frame section if we can mark the FDEs individually. */
12142 _bfd_elf_begin_eh_frame_parsing (info
);
12143 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
12146 struct elf_reloc_cookie cookie
;
12148 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
12149 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
12151 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
12152 if (elf_section_data (sec
)->sec_info
12153 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
12154 elf_eh_frame_section (sub
) = sec
;
12155 fini_reloc_cookie_for_section (&cookie
, sec
);
12156 sec
= bfd_get_next_section_by_name (sec
);
12159 _bfd_elf_end_eh_frame_parsing (info
);
12161 /* Apply transitive closure to the vtable entry usage info. */
12162 elf_link_hash_traverse (elf_hash_table (info
),
12163 elf_gc_propagate_vtable_entries_used
,
12168 /* Kill the vtable relocations that were not used. */
12169 elf_link_hash_traverse (elf_hash_table (info
),
12170 elf_gc_smash_unused_vtentry_relocs
,
12175 /* Mark dynamically referenced symbols. */
12176 if (elf_hash_table (info
)->dynamic_sections_created
)
12177 elf_link_hash_traverse (elf_hash_table (info
),
12178 bed
->gc_mark_dynamic_ref
,
12181 /* Grovel through relocs to find out who stays ... */
12182 gc_mark_hook
= bed
->gc_mark_hook
;
12183 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
12187 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
12190 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12191 Also treat note sections as a root, if the section is not part
12193 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
12195 && (o
->flags
& SEC_EXCLUDE
) == 0
12196 && ((o
->flags
& SEC_KEEP
) != 0
12197 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
12198 && elf_next_in_group (o
) == NULL
)))
12200 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
12205 /* Allow the backend to mark additional target specific sections. */
12206 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
12208 /* ... and mark SEC_EXCLUDE for those that go. */
12209 return elf_gc_sweep (abfd
, info
);
12212 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12215 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
12217 struct elf_link_hash_entry
*h
,
12220 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
12221 struct elf_link_hash_entry
**search
, *child
;
12222 bfd_size_type extsymcount
;
12223 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12225 /* The sh_info field of the symtab header tells us where the
12226 external symbols start. We don't care about the local symbols at
12228 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
12229 if (!elf_bad_symtab (abfd
))
12230 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
12232 sym_hashes
= elf_sym_hashes (abfd
);
12233 sym_hashes_end
= sym_hashes
+ extsymcount
;
12235 /* Hunt down the child symbol, which is in this section at the same
12236 offset as the relocation. */
12237 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
12239 if ((child
= *search
) != NULL
12240 && (child
->root
.type
== bfd_link_hash_defined
12241 || child
->root
.type
== bfd_link_hash_defweak
)
12242 && child
->root
.u
.def
.section
== sec
12243 && child
->root
.u
.def
.value
== offset
)
12247 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
12248 abfd
, sec
, (unsigned long) offset
);
12249 bfd_set_error (bfd_error_invalid_operation
);
12253 if (!child
->vtable
)
12255 child
->vtable
= (struct elf_link_virtual_table_entry
*)
12256 bfd_zalloc (abfd
, sizeof (*child
->vtable
));
12257 if (!child
->vtable
)
12262 /* This *should* only be the absolute section. It could potentially
12263 be that someone has defined a non-global vtable though, which
12264 would be bad. It isn't worth paging in the local symbols to be
12265 sure though; that case should simply be handled by the assembler. */
12267 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
12270 child
->vtable
->parent
= h
;
12275 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12278 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
12279 asection
*sec ATTRIBUTE_UNUSED
,
12280 struct elf_link_hash_entry
*h
,
12283 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12284 unsigned int log_file_align
= bed
->s
->log_file_align
;
12288 h
->vtable
= (struct elf_link_virtual_table_entry
*)
12289 bfd_zalloc (abfd
, sizeof (*h
->vtable
));
12294 if (addend
>= h
->vtable
->size
)
12296 size_t size
, bytes
, file_align
;
12297 bfd_boolean
*ptr
= h
->vtable
->used
;
12299 /* While the symbol is undefined, we have to be prepared to handle
12301 file_align
= 1 << log_file_align
;
12302 if (h
->root
.type
== bfd_link_hash_undefined
)
12303 size
= addend
+ file_align
;
12307 if (addend
>= size
)
12309 /* Oops! We've got a reference past the defined end of
12310 the table. This is probably a bug -- shall we warn? */
12311 size
= addend
+ file_align
;
12314 size
= (size
+ file_align
- 1) & -file_align
;
12316 /* Allocate one extra entry for use as a "done" flag for the
12317 consolidation pass. */
12318 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
12322 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
12328 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
12329 * sizeof (bfd_boolean
));
12330 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
12334 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
12339 /* And arrange for that done flag to be at index -1. */
12340 h
->vtable
->used
= ptr
+ 1;
12341 h
->vtable
->size
= size
;
12344 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
12349 /* Map an ELF section header flag to its corresponding string. */
12353 flagword flag_value
;
12354 } elf_flags_to_name_table
;
12356 static elf_flags_to_name_table elf_flags_to_names
[] =
12358 { "SHF_WRITE", SHF_WRITE
},
12359 { "SHF_ALLOC", SHF_ALLOC
},
12360 { "SHF_EXECINSTR", SHF_EXECINSTR
},
12361 { "SHF_MERGE", SHF_MERGE
},
12362 { "SHF_STRINGS", SHF_STRINGS
},
12363 { "SHF_INFO_LINK", SHF_INFO_LINK
},
12364 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
12365 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
12366 { "SHF_GROUP", SHF_GROUP
},
12367 { "SHF_TLS", SHF_TLS
},
12368 { "SHF_MASKOS", SHF_MASKOS
},
12369 { "SHF_EXCLUDE", SHF_EXCLUDE
},
12372 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12374 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
12375 struct flag_info
*flaginfo
,
12378 const bfd_vma sh_flags
= elf_section_flags (section
);
12380 if (!flaginfo
->flags_initialized
)
12382 bfd
*obfd
= info
->output_bfd
;
12383 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12384 struct flag_info_list
*tf
= flaginfo
->flag_list
;
12386 int without_hex
= 0;
12388 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
12391 flagword (*lookup
) (char *);
12393 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
12394 if (lookup
!= NULL
)
12396 flagword hexval
= (*lookup
) ((char *) tf
->name
);
12400 if (tf
->with
== with_flags
)
12401 with_hex
|= hexval
;
12402 else if (tf
->with
== without_flags
)
12403 without_hex
|= hexval
;
12408 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
12410 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
12412 if (tf
->with
== with_flags
)
12413 with_hex
|= elf_flags_to_names
[i
].flag_value
;
12414 else if (tf
->with
== without_flags
)
12415 without_hex
|= elf_flags_to_names
[i
].flag_value
;
12422 info
->callbacks
->einfo
12423 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
12427 flaginfo
->flags_initialized
= TRUE
;
12428 flaginfo
->only_with_flags
|= with_hex
;
12429 flaginfo
->not_with_flags
|= without_hex
;
12432 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
12435 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
12441 struct alloc_got_off_arg
{
12443 struct bfd_link_info
*info
;
12446 /* We need a special top-level link routine to convert got reference counts
12447 to real got offsets. */
12450 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
12452 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
12453 bfd
*obfd
= gofarg
->info
->output_bfd
;
12454 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12456 if (h
->got
.refcount
> 0)
12458 h
->got
.offset
= gofarg
->gotoff
;
12459 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
12462 h
->got
.offset
= (bfd_vma
) -1;
12467 /* And an accompanying bit to work out final got entry offsets once
12468 we're done. Should be called from final_link. */
12471 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
12472 struct bfd_link_info
*info
)
12475 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12477 struct alloc_got_off_arg gofarg
;
12479 BFD_ASSERT (abfd
== info
->output_bfd
);
12481 if (! is_elf_hash_table (info
->hash
))
12484 /* The GOT offset is relative to the .got section, but the GOT header is
12485 put into the .got.plt section, if the backend uses it. */
12486 if (bed
->want_got_plt
)
12489 gotoff
= bed
->got_header_size
;
12491 /* Do the local .got entries first. */
12492 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
12494 bfd_signed_vma
*local_got
;
12495 bfd_size_type j
, locsymcount
;
12496 Elf_Internal_Shdr
*symtab_hdr
;
12498 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
12501 local_got
= elf_local_got_refcounts (i
);
12505 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
12506 if (elf_bad_symtab (i
))
12507 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12509 locsymcount
= symtab_hdr
->sh_info
;
12511 for (j
= 0; j
< locsymcount
; ++j
)
12513 if (local_got
[j
] > 0)
12515 local_got
[j
] = gotoff
;
12516 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
12519 local_got
[j
] = (bfd_vma
) -1;
12523 /* Then the global .got entries. .plt refcounts are handled by
12524 adjust_dynamic_symbol */
12525 gofarg
.gotoff
= gotoff
;
12526 gofarg
.info
= info
;
12527 elf_link_hash_traverse (elf_hash_table (info
),
12528 elf_gc_allocate_got_offsets
,
12533 /* Many folk need no more in the way of final link than this, once
12534 got entry reference counting is enabled. */
12537 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12539 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12542 /* Invoke the regular ELF backend linker to do all the work. */
12543 return bfd_elf_final_link (abfd
, info
);
12547 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12549 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
12551 if (rcookie
->bad_symtab
)
12552 rcookie
->rel
= rcookie
->rels
;
12554 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12556 unsigned long r_symndx
;
12558 if (! rcookie
->bad_symtab
)
12559 if (rcookie
->rel
->r_offset
> offset
)
12561 if (rcookie
->rel
->r_offset
!= offset
)
12564 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12565 if (r_symndx
== STN_UNDEF
)
12568 if (r_symndx
>= rcookie
->locsymcount
12569 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12571 struct elf_link_hash_entry
*h
;
12573 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12575 while (h
->root
.type
== bfd_link_hash_indirect
12576 || h
->root
.type
== bfd_link_hash_warning
)
12577 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12579 if ((h
->root
.type
== bfd_link_hash_defined
12580 || h
->root
.type
== bfd_link_hash_defweak
)
12581 && discarded_section (h
->root
.u
.def
.section
))
12588 /* It's not a relocation against a global symbol,
12589 but it could be a relocation against a local
12590 symbol for a discarded section. */
12592 Elf_Internal_Sym
*isym
;
12594 /* Need to: get the symbol; get the section. */
12595 isym
= &rcookie
->locsyms
[r_symndx
];
12596 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12597 if (isec
!= NULL
&& discarded_section (isec
))
12605 /* Discard unneeded references to discarded sections.
12606 Returns TRUE if any section's size was changed. */
12607 /* This function assumes that the relocations are in sorted order,
12608 which is true for all known assemblers. */
12611 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12613 struct elf_reloc_cookie cookie
;
12614 asection
*stab
, *eh
;
12615 const struct elf_backend_data
*bed
;
12617 bfd_boolean ret
= FALSE
;
12619 if (info
->traditional_format
12620 || !is_elf_hash_table (info
->hash
))
12623 _bfd_elf_begin_eh_frame_parsing (info
);
12624 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12626 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12629 bed
= get_elf_backend_data (abfd
);
12632 if (!info
->relocatable
)
12634 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12637 || bfd_is_abs_section (eh
->output_section
)))
12638 eh
= bfd_get_next_section_by_name (eh
);
12641 stab
= bfd_get_section_by_name (abfd
, ".stab");
12643 && (stab
->size
== 0
12644 || bfd_is_abs_section (stab
->output_section
)
12645 || stab
->sec_info_type
!= SEC_INFO_TYPE_STABS
))
12650 && bed
->elf_backend_discard_info
== NULL
)
12653 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12657 && stab
->reloc_count
> 0
12658 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12660 if (_bfd_discard_section_stabs (abfd
, stab
,
12661 elf_section_data (stab
)->sec_info
,
12662 bfd_elf_reloc_symbol_deleted_p
,
12665 fini_reloc_cookie_rels (&cookie
, stab
);
12669 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12671 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12672 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12673 bfd_elf_reloc_symbol_deleted_p
,
12676 fini_reloc_cookie_rels (&cookie
, eh
);
12677 eh
= bfd_get_next_section_by_name (eh
);
12680 if (bed
->elf_backend_discard_info
!= NULL
12681 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12684 fini_reloc_cookie (&cookie
, abfd
);
12686 _bfd_elf_end_eh_frame_parsing (info
);
12688 if (info
->eh_frame_hdr
12689 && !info
->relocatable
12690 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12697 _bfd_elf_section_already_linked (bfd
*abfd
,
12699 struct bfd_link_info
*info
)
12702 const char *name
, *key
;
12703 struct bfd_section_already_linked
*l
;
12704 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12706 if (sec
->output_section
== bfd_abs_section_ptr
)
12709 flags
= sec
->flags
;
12711 /* Return if it isn't a linkonce section. A comdat group section
12712 also has SEC_LINK_ONCE set. */
12713 if ((flags
& SEC_LINK_ONCE
) == 0)
12716 /* Don't put group member sections on our list of already linked
12717 sections. They are handled as a group via their group section. */
12718 if (elf_sec_group (sec
) != NULL
)
12721 /* For a SHT_GROUP section, use the group signature as the key. */
12723 if ((flags
& SEC_GROUP
) != 0
12724 && elf_next_in_group (sec
) != NULL
12725 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12726 key
= elf_group_name (elf_next_in_group (sec
));
12729 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12730 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12731 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12734 /* Must be a user linkonce section that doesn't follow gcc's
12735 naming convention. In this case we won't be matching
12736 single member groups. */
12740 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
12742 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12744 /* We may have 2 different types of sections on the list: group
12745 sections with a signature of <key> (<key> is some string),
12746 and linkonce sections named .gnu.linkonce.<type>.<key>.
12747 Match like sections. LTO plugin sections are an exception.
12748 They are always named .gnu.linkonce.t.<key> and match either
12749 type of section. */
12750 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12751 && ((flags
& SEC_GROUP
) != 0
12752 || strcmp (name
, l
->sec
->name
) == 0))
12753 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
12755 /* The section has already been linked. See if we should
12756 issue a warning. */
12757 if (!_bfd_handle_already_linked (sec
, l
, info
))
12760 if (flags
& SEC_GROUP
)
12762 asection
*first
= elf_next_in_group (sec
);
12763 asection
*s
= first
;
12767 s
->output_section
= bfd_abs_section_ptr
;
12768 /* Record which group discards it. */
12769 s
->kept_section
= l
->sec
;
12770 s
= elf_next_in_group (s
);
12771 /* These lists are circular. */
12781 /* A single member comdat group section may be discarded by a
12782 linkonce section and vice versa. */
12783 if ((flags
& SEC_GROUP
) != 0)
12785 asection
*first
= elf_next_in_group (sec
);
12787 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12788 /* Check this single member group against linkonce sections. */
12789 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12790 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12791 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12793 first
->output_section
= bfd_abs_section_ptr
;
12794 first
->kept_section
= l
->sec
;
12795 sec
->output_section
= bfd_abs_section_ptr
;
12800 /* Check this linkonce section against single member groups. */
12801 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12802 if (l
->sec
->flags
& SEC_GROUP
)
12804 asection
*first
= elf_next_in_group (l
->sec
);
12807 && elf_next_in_group (first
) == first
12808 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12810 sec
->output_section
= bfd_abs_section_ptr
;
12811 sec
->kept_section
= first
;
12816 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12817 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12818 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12819 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12820 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12821 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12822 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12823 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12824 The reverse order cannot happen as there is never a bfd with only the
12825 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12826 matter as here were are looking only for cross-bfd sections. */
12828 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12829 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12830 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12831 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12833 if (abfd
!= l
->sec
->owner
)
12834 sec
->output_section
= bfd_abs_section_ptr
;
12838 /* This is the first section with this name. Record it. */
12839 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12840 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12841 return sec
->output_section
== bfd_abs_section_ptr
;
12845 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12847 return sym
->st_shndx
== SHN_COMMON
;
12851 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12857 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12859 return bfd_com_section_ptr
;
12863 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12864 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12865 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12866 bfd
*ibfd ATTRIBUTE_UNUSED
,
12867 unsigned long symndx ATTRIBUTE_UNUSED
)
12869 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12870 return bed
->s
->arch_size
/ 8;
12873 /* Routines to support the creation of dynamic relocs. */
12875 /* Returns the name of the dynamic reloc section associated with SEC. */
12877 static const char *
12878 get_dynamic_reloc_section_name (bfd
* abfd
,
12880 bfd_boolean is_rela
)
12883 const char *old_name
= bfd_get_section_name (NULL
, sec
);
12884 const char *prefix
= is_rela
? ".rela" : ".rel";
12886 if (old_name
== NULL
)
12889 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
12890 sprintf (name
, "%s%s", prefix
, old_name
);
12895 /* Returns the dynamic reloc section associated with SEC.
12896 If necessary compute the name of the dynamic reloc section based
12897 on SEC's name (looked up in ABFD's string table) and the setting
12901 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12903 bfd_boolean is_rela
)
12905 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12907 if (reloc_sec
== NULL
)
12909 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12913 reloc_sec
= bfd_get_linker_section (abfd
, name
);
12915 if (reloc_sec
!= NULL
)
12916 elf_section_data (sec
)->sreloc
= reloc_sec
;
12923 /* Returns the dynamic reloc section associated with SEC. If the
12924 section does not exist it is created and attached to the DYNOBJ
12925 bfd and stored in the SRELOC field of SEC's elf_section_data
12928 ALIGNMENT is the alignment for the newly created section and
12929 IS_RELA defines whether the name should be .rela.<SEC's name>
12930 or .rel.<SEC's name>. The section name is looked up in the
12931 string table associated with ABFD. */
12934 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12936 unsigned int alignment
,
12938 bfd_boolean is_rela
)
12940 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12942 if (reloc_sec
== NULL
)
12944 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12949 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
12951 if (reloc_sec
== NULL
)
12953 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
12954 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12955 if ((sec
->flags
& SEC_ALLOC
) != 0)
12956 flags
|= SEC_ALLOC
| SEC_LOAD
;
12958 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
12959 if (reloc_sec
!= NULL
)
12961 /* _bfd_elf_get_sec_type_attr chooses a section type by
12962 name. Override as it may be wrong, eg. for a user
12963 section named "auto" we'll get ".relauto" which is
12964 seen to be a .rela section. */
12965 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
12966 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12971 elf_section_data (sec
)->sreloc
= reloc_sec
;
12977 /* Copy the ELF symbol type associated with a linker hash entry. */
12979 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd ATTRIBUTE_UNUSED
,
12980 struct bfd_link_hash_entry
* hdest
,
12981 struct bfd_link_hash_entry
* hsrc
)
12983 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*)hdest
;
12984 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*)hsrc
;
12986 ehdest
->type
= ehsrc
->type
;
12987 ehdest
->target_internal
= ehsrc
->target_internal
;
12990 /* Append a RELA relocation REL to section S in BFD. */
12993 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
12995 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12996 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
12997 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
12998 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
13001 /* Append a REL relocation REL to section S in BFD. */
13004 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
13006 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13007 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
13008 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
13009 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);