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
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
;
39 struct bfd_elf_version_tree
*verdefs
;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info
*info
;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry
*
62 _bfd_elf_define_linkage_sym (bfd
*abfd
,
63 struct bfd_link_info
*info
,
67 struct elf_link_hash_entry
*h
;
68 struct bfd_link_hash_entry
*bh
;
69 const struct elf_backend_data
*bed
;
71 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h
->root
.type
= bfd_link_hash_new
;
82 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
84 get_elf_backend_data (abfd
)->collect
,
87 h
= (struct elf_link_hash_entry
*) bh
;
91 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
93 bed
= get_elf_backend_data (abfd
);
94 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
99 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
103 struct elf_link_hash_entry
*h
;
104 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
105 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
107 /* This function may be called more than once. */
108 s
= bfd_get_section_by_name (abfd
, ".got");
109 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
112 flags
= bed
->dynamic_sec_flags
;
114 s
= bfd_make_section_with_flags (abfd
,
115 (bed
->rela_plts_and_copies_p
116 ? ".rela.got" : ".rel.got"),
117 (bed
->dynamic_sec_flags
120 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
124 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
126 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
130 if (bed
->want_got_plt
)
132 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
134 || !bfd_set_section_alignment (abfd
, s
,
135 bed
->s
->log_file_align
))
140 /* The first bit of the global offset table is the header. */
141 s
->size
+= bed
->got_header_size
;
143 if (bed
->want_got_sym
)
145 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
146 (or .got.plt) section. We don't do this in the linker script
147 because we don't want to define the symbol if we are not creating
148 a global offset table. */
149 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
150 "_GLOBAL_OFFSET_TABLE_");
151 elf_hash_table (info
)->hgot
= h
;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
163 struct elf_link_hash_table
*hash_table
;
165 hash_table
= elf_hash_table (info
);
166 if (hash_table
->dynobj
== NULL
)
167 hash_table
->dynobj
= abfd
;
169 if (hash_table
->dynstr
== NULL
)
171 hash_table
->dynstr
= _bfd_elf_strtab_init ();
172 if (hash_table
->dynstr
== NULL
)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
190 const struct elf_backend_data
*bed
;
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_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_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_with_flags (abfd
, ".gnu.version",
225 flags
| SEC_READONLY
);
227 || ! bfd_set_section_alignment (abfd
, s
, 1))
230 s
= bfd_make_section_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_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_with_flags (abfd
, ".dynstr",
243 flags
| SEC_READONLY
);
247 s
= bfd_make_section_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 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
263 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
265 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
267 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
270 if (info
->emit_gnu_hash
)
272 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
273 flags
| SEC_READONLY
);
275 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed
->s
->arch_size
== 64)
281 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
283 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
292 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
302 flagword flags
, pltflags
;
303 struct elf_link_hash_entry
*h
;
305 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
306 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
308 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
309 .rel[a].bss sections. */
310 flags
= bed
->dynamic_sec_flags
;
313 if (bed
->plt_not_loaded
)
314 /* We do not clear SEC_ALLOC here because we still want the OS to
315 allocate space for the section; it's just that there's nothing
316 to read in from the object file. */
317 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
319 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
320 if (bed
->plt_readonly
)
321 pltflags
|= SEC_READONLY
;
323 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
325 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
329 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
331 if (bed
->want_plt_sym
)
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
334 "_PROCEDURE_LINKAGE_TABLE_");
335 elf_hash_table (info
)->hplt
= h
;
340 s
= bfd_make_section_with_flags (abfd
,
341 (bed
->rela_plts_and_copies_p
342 ? ".rela.plt" : ".rel.plt"),
343 flags
| SEC_READONLY
);
345 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
349 if (! _bfd_elf_create_got_section (abfd
, info
))
352 if (bed
->want_dynbss
)
354 /* The .dynbss section is a place to put symbols which are defined
355 by dynamic objects, are referenced by regular objects, and are
356 not functions. We must allocate space for them in the process
357 image and use a R_*_COPY reloc to tell the dynamic linker to
358 initialize them at run time. The linker script puts the .dynbss
359 section into the .bss section of the final image. */
360 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
362 | SEC_LINKER_CREATED
));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s
= bfd_make_section_with_flags (abfd
,
380 (bed
->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags
| SEC_READONLY
);
384 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
402 struct elf_link_hash_entry
*h
)
404 if (h
->dynindx
== -1)
406 struct elf_strtab_hash
*dynstr
;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h
->other
))
419 if (h
->root
.type
!= bfd_link_hash_undefined
420 && h
->root
.type
!= bfd_link_hash_undefweak
)
423 if (!elf_hash_table (info
)->is_relocatable_executable
)
431 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
432 ++elf_hash_table (info
)->dynsymcount
;
434 dynstr
= elf_hash_table (info
)->dynstr
;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name
= h
->root
.root
.string
;
446 p
= strchr (name
, ELF_VER_CHR
);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
460 if (indx
== (bfd_size_type
) -1)
462 h
->dynstr_index
= indx
;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
472 struct elf_link_hash_entry
*h
,
473 Elf_Internal_Sym
*sym
)
475 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
477 /* It may be called more than once on the same H. */
478 if(h
->dynamic
|| info
->relocatable
)
481 if ((info
->dynamic_data
482 && (h
->type
== STT_OBJECT
484 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
486 && h
->root
.type
== bfd_link_hash_new
487 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd
*output_bfd
,
496 struct bfd_link_info
*info
,
501 struct elf_link_hash_entry
*h
, *hv
;
502 struct elf_link_hash_table
*htab
;
503 const struct elf_backend_data
*bed
;
505 if (!is_elf_hash_table (info
->hash
))
508 htab
= elf_hash_table (info
);
509 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
513 switch (h
->root
.type
)
515 case bfd_link_hash_defined
:
516 case bfd_link_hash_defweak
:
517 case bfd_link_hash_common
:
519 case bfd_link_hash_undefweak
:
520 case bfd_link_hash_undefined
:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h
->root
.type
= bfd_link_hash_new
;
525 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
526 bfd_link_repair_undef_list (&htab
->root
);
528 case bfd_link_hash_new
:
529 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
532 case bfd_link_hash_indirect
:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed
= get_elf_backend_data (output_bfd
);
537 while (hv
->root
.type
== bfd_link_hash_indirect
538 || hv
->root
.type
== bfd_link_hash_warning
)
539 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
540 /* We don't need to update h->root.u since linker will set them
542 h
->root
.type
= bfd_link_hash_undefined
;
543 hv
->root
.type
= bfd_link_hash_indirect
;
544 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
545 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
547 case bfd_link_hash_warning
:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h
->root
.type
= bfd_link_hash_undefined
;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h
->verinfo
.verdef
= NULL
;
572 if (provide
&& hidden
)
574 bed
= get_elf_backend_data (output_bfd
);
575 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
576 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info
->relocatable
583 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
590 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
593 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h
->u
.weakdef
!= NULL
600 && h
->u
.weakdef
->dynindx
== -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
620 struct elf_link_local_dynamic_entry
*entry
;
621 struct elf_link_hash_table
*eht
;
622 struct elf_strtab_hash
*dynstr
;
623 unsigned long dynstr_index
;
625 Elf_External_Sym_Shndx eshndx
;
626 char esym
[sizeof (Elf64_External_Sym
)];
628 if (! is_elf_hash_table (info
->hash
))
631 /* See if the entry exists already. */
632 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
633 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
636 amt
= sizeof (*entry
);
637 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
643 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
645 bfd_release (input_bfd
, entry
);
649 if (entry
->isym
.st_shndx
!= SHN_UNDEF
650 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
654 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
655 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd
, entry
);
664 name
= (bfd_elf_string_from_elf_section
665 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
666 entry
->isym
.st_name
));
668 dynstr
= elf_hash_table (info
)->dynstr
;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
677 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
678 if (dynstr_index
== (unsigned long) -1)
680 entry
->isym
.st_name
= dynstr_index
;
682 eht
= elf_hash_table (info
);
684 entry
->next
= eht
->dynlocal
;
685 eht
->dynlocal
= entry
;
686 entry
->input_bfd
= input_bfd
;
687 entry
->input_indx
= input_indx
;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
706 struct elf_link_local_dynamic_entry
*e
;
708 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
709 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
722 size_t *count
= (size_t *) data
;
724 if (h
->root
.type
== bfd_link_hash_warning
)
725 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
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
->root
.type
== bfd_link_hash_warning
)
747 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
749 if (!h
->forced_local
)
752 if (h
->dynindx
!= -1)
753 h
->dynindx
= ++(*count
);
758 /* Return true if the dynamic symbol for a given section should be
759 omitted when creating a shared library. */
761 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
762 struct bfd_link_info
*info
,
765 struct elf_link_hash_table
*htab
;
767 switch (elf_section_data (p
)->this_hdr
.sh_type
)
771 /* If sh_type is yet undecided, assume it could be
772 SHT_PROGBITS/SHT_NOBITS. */
774 htab
= elf_hash_table (info
);
775 if (p
== htab
->tls_sec
)
778 if (htab
->text_index_section
!= NULL
)
779 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
781 if (strcmp (p
->name
, ".got") == 0
782 || strcmp (p
->name
, ".got.plt") == 0
783 || strcmp (p
->name
, ".plt") == 0)
787 if (htab
->dynobj
!= NULL
788 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
789 && (ip
->flags
& SEC_LINKER_CREATED
)
790 && ip
->output_section
== p
)
795 /* There shouldn't be section relative relocations
796 against any other section. */
802 /* Assign dynsym indices. In a shared library we generate a section
803 symbol for each output section, which come first. Next come symbols
804 which have been forced to local binding. Then all of the back-end
805 allocated local dynamic syms, followed by the rest of the global
809 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
810 struct bfd_link_info
*info
,
811 unsigned long *section_sym_count
)
813 unsigned long dynsymcount
= 0;
815 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
817 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
819 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
820 if ((p
->flags
& SEC_EXCLUDE
) == 0
821 && (p
->flags
& SEC_ALLOC
) != 0
822 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
823 elf_section_data (p
)->dynindx
= ++dynsymcount
;
825 elf_section_data (p
)->dynindx
= 0;
827 *section_sym_count
= dynsymcount
;
829 elf_link_hash_traverse (elf_hash_table (info
),
830 elf_link_renumber_local_hash_table_dynsyms
,
833 if (elf_hash_table (info
)->dynlocal
)
835 struct elf_link_local_dynamic_entry
*p
;
836 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
837 p
->dynindx
= ++dynsymcount
;
840 elf_link_hash_traverse (elf_hash_table (info
),
841 elf_link_renumber_hash_table_dynsyms
,
844 /* There is an unused NULL entry at the head of the table which
845 we must account for in our count. Unless there weren't any
846 symbols, which means we'll have no table at all. */
847 if (dynsymcount
!= 0)
850 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
854 /* Merge st_other field. */
857 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
858 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
861 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
863 /* If st_other has a processor-specific meaning, specific
864 code might be needed here. We never merge the visibility
865 attribute with the one from a dynamic object. */
866 if (bed
->elf_backend_merge_symbol_attribute
)
867 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
870 /* If this symbol has default visibility and the user has requested
871 we not re-export it, then mark it as hidden. */
875 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
876 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
877 isym
->st_other
= (STV_HIDDEN
878 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
880 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
882 unsigned char hvis
, symvis
, other
, nvis
;
884 /* Only merge the visibility. Leave the remainder of the
885 st_other field to elf_backend_merge_symbol_attribute. */
886 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
888 /* Combine visibilities, using the most constraining one. */
889 hvis
= ELF_ST_VISIBILITY (h
->other
);
890 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
896 nvis
= hvis
< symvis
? hvis
: symvis
;
898 h
->other
= other
| nvis
;
902 /* This function is called when we want to define a new symbol. It
903 handles the various cases which arise when we find a definition in
904 a dynamic object, or when there is already a definition in a
905 dynamic object. The new symbol is described by NAME, SYM, PSEC,
906 and PVALUE. We set SYM_HASH to the hash table entry. We set
907 OVERRIDE if the old symbol is overriding a new definition. We set
908 TYPE_CHANGE_OK if it is OK for the type to change. We set
909 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
910 change, we mean that we shouldn't warn if the type or size does
911 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
912 object is overridden by a regular object. */
915 _bfd_elf_merge_symbol (bfd
*abfd
,
916 struct bfd_link_info
*info
,
918 Elf_Internal_Sym
*sym
,
921 unsigned int *pold_alignment
,
922 struct elf_link_hash_entry
**sym_hash
,
924 bfd_boolean
*override
,
925 bfd_boolean
*type_change_ok
,
926 bfd_boolean
*size_change_ok
)
928 asection
*sec
, *oldsec
;
929 struct elf_link_hash_entry
*h
;
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 /* Silently discard TLS symbols from --just-syms. There's no way to
944 combine a static TLS block with a new TLS block for this executable. */
945 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
946 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
952 if (! bfd_is_und_section (sec
))
953 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
955 h
= ((struct elf_link_hash_entry
*)
956 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
961 bed
= get_elf_backend_data (abfd
);
963 /* This code is for coping with dynamic objects, and is only useful
964 if we are doing an ELF link. */
965 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
968 /* For merging, we only care about real symbols. */
970 while (h
->root
.type
== bfd_link_hash_indirect
971 || h
->root
.type
== bfd_link_hash_warning
)
972 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
974 /* We have to check it for every instance since the first few may be
975 refereences and not all compilers emit symbol type for undefined
977 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
979 /* If we just created the symbol, mark it as being an ELF symbol.
980 Other than that, there is nothing to do--there is no merge issue
981 with a newly defined symbol--so we just return. */
983 if (h
->root
.type
== bfd_link_hash_new
)
989 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
992 switch (h
->root
.type
)
999 case bfd_link_hash_undefined
:
1000 case bfd_link_hash_undefweak
:
1001 oldbfd
= h
->root
.u
.undef
.abfd
;
1005 case bfd_link_hash_defined
:
1006 case bfd_link_hash_defweak
:
1007 oldbfd
= h
->root
.u
.def
.section
->owner
;
1008 oldsec
= h
->root
.u
.def
.section
;
1011 case bfd_link_hash_common
:
1012 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1013 oldsec
= h
->root
.u
.c
.p
->section
;
1017 /* Differentiate strong and weak symbols. */
1018 newweak
= bind
== STB_WEAK
;
1019 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1020 || h
->root
.type
== bfd_link_hash_undefweak
);
1022 /* In cases involving weak versioned symbols, we may wind up trying
1023 to merge a symbol with itself. Catch that here, to avoid the
1024 confusion that results if we try to override a symbol with
1025 itself. The additional tests catch cases like
1026 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1027 dynamic object, which we do want to handle here. */
1029 && (newweak
|| oldweak
)
1030 && ((abfd
->flags
& DYNAMIC
) == 0
1031 || !h
->def_regular
))
1034 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1035 respectively, is from a dynamic object. */
1037 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1041 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1042 else if (oldsec
!= NULL
)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1054 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1055 && h
->root
.type
!= bfd_link_hash_undefweak
1056 && h
->root
.type
!= bfd_link_hash_common
);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1062 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1064 oldfunc
= (h
->type
!= STT_NOTYPE
1065 && bed
->is_function_type (h
->type
));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. We only do it
1070 if the existing regular definition won't be dynamic. */
1071 if (pold_alignment
== NULL
1073 && !info
->export_dynamic
1078 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1079 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1080 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1081 && h
->type
!= STT_NOTYPE
1082 && !(newfunc
&& oldfunc
))
1088 /* Check TLS symbol. We don't check undefined symbol introduced by
1090 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1091 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1095 bfd_boolean ntdef
, tdef
;
1096 asection
*ntsec
, *tsec
;
1098 if (h
->type
== STT_TLS
)
1118 (*_bfd_error_handler
)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1120 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1121 else if (!tdef
&& !ntdef
)
1122 (*_bfd_error_handler
)
1123 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1124 tbfd
, ntbfd
, h
->root
.root
.string
);
1126 (*_bfd_error_handler
)
1127 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1128 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1130 (*_bfd_error_handler
)
1131 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1132 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1134 bfd_set_error (bfd_error_bad_value
);
1138 /* We need to remember if a symbol has a definition in a dynamic
1139 object or is weak in all dynamic objects. Internal and hidden
1140 visibility will make it unavailable to dynamic objects. */
1141 if (newdyn
&& !h
->dynamic_def
)
1143 if (!bfd_is_und_section (sec
))
1147 /* Check if this symbol is weak in all dynamic objects. If it
1148 is the first time we see it in a dynamic object, we mark
1149 if it is weak. Otherwise, we clear it. */
1150 if (!h
->ref_dynamic
)
1152 if (bind
== STB_WEAK
)
1153 h
->dynamic_weak
= 1;
1155 else if (bind
!= STB_WEAK
)
1156 h
->dynamic_weak
= 0;
1160 /* If the old symbol has non-default visibility, we ignore the new
1161 definition from a dynamic object. */
1163 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1164 && !bfd_is_und_section (sec
))
1167 /* Make sure this symbol is dynamic. */
1169 /* A protected symbol has external availability. Make sure it is
1170 recorded as dynamic.
1172 FIXME: Should we check type and size for protected symbol? */
1173 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1174 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1179 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1182 /* If the new symbol with non-default visibility comes from a
1183 relocatable file and the old definition comes from a dynamic
1184 object, we remove the old definition. */
1185 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1187 /* Handle the case where the old dynamic definition is
1188 default versioned. We need to copy the symbol info from
1189 the symbol with default version to the normal one if it
1190 was referenced before. */
1193 struct elf_link_hash_entry
*vh
= *sym_hash
;
1195 vh
->root
.type
= h
->root
.type
;
1196 h
->root
.type
= bfd_link_hash_indirect
;
1197 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1198 /* Protected symbols will override the dynamic definition
1199 with default version. */
1200 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1202 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1203 vh
->dynamic_def
= 1;
1204 vh
->ref_dynamic
= 1;
1208 h
->root
.type
= vh
->root
.type
;
1209 vh
->ref_dynamic
= 0;
1210 /* We have to hide it here since it was made dynamic
1211 global with extra bits when the symbol info was
1212 copied from the old dynamic definition. */
1213 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1221 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1222 && bfd_is_und_section (sec
))
1224 /* If the new symbol is undefined and the old symbol was
1225 also undefined before, we need to make sure
1226 _bfd_generic_link_add_one_symbol doesn't mess
1227 up the linker hash table undefs list. Since the old
1228 definition came from a dynamic object, it is still on the
1230 h
->root
.type
= bfd_link_hash_undefined
;
1231 h
->root
.u
.undef
.abfd
= abfd
;
1235 h
->root
.type
= bfd_link_hash_new
;
1236 h
->root
.u
.undef
.abfd
= NULL
;
1245 /* FIXME: Should we check type and size for protected symbol? */
1251 if (bind
== STB_GNU_UNIQUE
)
1252 h
->unique_global
= 1;
1254 /* If a new weak symbol definition comes from a regular file and the
1255 old symbol comes from a dynamic library, we treat the new one as
1256 strong. Similarly, an old weak symbol definition from a regular
1257 file is treated as strong when the new symbol comes from a dynamic
1258 library. Further, an old weak symbol from a dynamic library is
1259 treated as strong if the new symbol is from a dynamic library.
1260 This reflects the way glibc's ld.so works.
1262 Do this before setting *type_change_ok or *size_change_ok so that
1263 we warn properly when dynamic library symbols are overridden. */
1265 if (newdef
&& !newdyn
&& olddyn
)
1267 if (olddef
&& newdyn
)
1270 /* Allow changes between different types of function symbol. */
1271 if (newfunc
&& oldfunc
)
1272 *type_change_ok
= TRUE
;
1274 /* It's OK to change the type if either the existing symbol or the
1275 new symbol is weak. A type change is also OK if the old symbol
1276 is undefined and the new symbol is defined. */
1281 && h
->root
.type
== bfd_link_hash_undefined
))
1282 *type_change_ok
= TRUE
;
1284 /* It's OK to change the size if either the existing symbol or the
1285 new symbol is weak, or if the old symbol is undefined. */
1288 || h
->root
.type
== bfd_link_hash_undefined
)
1289 *size_change_ok
= TRUE
;
1291 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1292 symbol, respectively, appears to be a common symbol in a dynamic
1293 object. If a symbol appears in an uninitialized section, and is
1294 not weak, and is not a function, then it may be a common symbol
1295 which was resolved when the dynamic object was created. We want
1296 to treat such symbols specially, because they raise special
1297 considerations when setting the symbol size: if the symbol
1298 appears as a common symbol in a regular object, and the size in
1299 the regular object is larger, we must make sure that we use the
1300 larger size. This problematic case can always be avoided in C,
1301 but it must be handled correctly when using Fortran shared
1304 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1305 likewise for OLDDYNCOMMON and OLDDEF.
1307 Note that this test is just a heuristic, and that it is quite
1308 possible to have an uninitialized symbol in a shared object which
1309 is really a definition, rather than a common symbol. This could
1310 lead to some minor confusion when the symbol really is a common
1311 symbol in some regular object. However, I think it will be
1317 && (sec
->flags
& SEC_ALLOC
) != 0
1318 && (sec
->flags
& SEC_LOAD
) == 0
1321 newdyncommon
= TRUE
;
1323 newdyncommon
= FALSE
;
1327 && h
->root
.type
== bfd_link_hash_defined
1329 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1330 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1333 olddyncommon
= TRUE
;
1335 olddyncommon
= FALSE
;
1337 /* We now know everything about the old and new symbols. We ask the
1338 backend to check if we can merge them. */
1339 if (bed
->merge_symbol
1340 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1341 pold_alignment
, skip
, override
,
1342 type_change_ok
, size_change_ok
,
1343 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1345 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1349 /* If both the old and the new symbols look like common symbols in a
1350 dynamic object, set the size of the symbol to the larger of the
1355 && sym
->st_size
!= h
->size
)
1357 /* Since we think we have two common symbols, issue a multiple
1358 common warning if desired. Note that we only warn if the
1359 size is different. If the size is the same, we simply let
1360 the old symbol override the new one as normally happens with
1361 symbols defined in dynamic objects. */
1363 if (! ((*info
->callbacks
->multiple_common
)
1364 (info
, &h
->root
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1367 if (sym
->st_size
> h
->size
)
1368 h
->size
= sym
->st_size
;
1370 *size_change_ok
= TRUE
;
1373 /* If we are looking at a dynamic object, and we have found a
1374 definition, we need to see if the symbol was already defined by
1375 some other object. If so, we want to use the existing
1376 definition, and we do not want to report a multiple symbol
1377 definition error; we do this by clobbering *PSEC to be
1378 bfd_und_section_ptr.
1380 We treat a common symbol as a definition if the symbol in the
1381 shared library is a function, since common symbols always
1382 represent variables; this can cause confusion in principle, but
1383 any such confusion would seem to indicate an erroneous program or
1384 shared library. We also permit a common symbol in a regular
1385 object to override a weak symbol in a shared object. */
1390 || (h
->root
.type
== bfd_link_hash_common
1391 && (newweak
|| newfunc
))))
1395 newdyncommon
= FALSE
;
1397 *psec
= sec
= bfd_und_section_ptr
;
1398 *size_change_ok
= TRUE
;
1400 /* If we get here when the old symbol is a common symbol, then
1401 we are explicitly letting it override a weak symbol or
1402 function in a dynamic object, and we don't want to warn about
1403 a type change. If the old symbol is a defined symbol, a type
1404 change warning may still be appropriate. */
1406 if (h
->root
.type
== bfd_link_hash_common
)
1407 *type_change_ok
= TRUE
;
1410 /* Handle the special case of an old common symbol merging with a
1411 new symbol which looks like a common symbol in a shared object.
1412 We change *PSEC and *PVALUE to make the new symbol look like a
1413 common symbol, and let _bfd_generic_link_add_one_symbol do the
1417 && h
->root
.type
== bfd_link_hash_common
)
1421 newdyncommon
= FALSE
;
1422 *pvalue
= sym
->st_size
;
1423 *psec
= sec
= bed
->common_section (oldsec
);
1424 *size_change_ok
= TRUE
;
1427 /* Skip weak definitions of symbols that are already defined. */
1428 if (newdef
&& olddef
&& newweak
)
1432 /* Merge st_other. If the symbol already has a dynamic index,
1433 but visibility says it should not be visible, turn it into a
1435 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1436 if (h
->dynindx
!= -1)
1437 switch (ELF_ST_VISIBILITY (h
->other
))
1441 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1446 /* If the old symbol is from a dynamic object, and the new symbol is
1447 a definition which is not from a dynamic object, then the new
1448 symbol overrides the old symbol. Symbols from regular files
1449 always take precedence over symbols from dynamic objects, even if
1450 they are defined after the dynamic object in the link.
1452 As above, we again permit a common symbol in a regular object to
1453 override a definition in a shared object if the shared object
1454 symbol is a function or is weak. */
1459 || (bfd_is_com_section (sec
)
1460 && (oldweak
|| oldfunc
)))
1465 /* Change the hash table entry to undefined, and let
1466 _bfd_generic_link_add_one_symbol do the right thing with the
1469 h
->root
.type
= bfd_link_hash_undefined
;
1470 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1471 *size_change_ok
= TRUE
;
1474 olddyncommon
= FALSE
;
1476 /* We again permit a type change when a common symbol may be
1477 overriding a function. */
1479 if (bfd_is_com_section (sec
))
1483 /* If a common symbol overrides a function, make sure
1484 that it isn't defined dynamically nor has type
1487 h
->type
= STT_NOTYPE
;
1489 *type_change_ok
= TRUE
;
1492 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1495 /* This union may have been set to be non-NULL when this symbol
1496 was seen in a dynamic object. We must force the union to be
1497 NULL, so that it is correct for a regular symbol. */
1498 h
->verinfo
.vertree
= NULL
;
1501 /* Handle the special case of a new common symbol merging with an
1502 old symbol that looks like it might be a common symbol defined in
1503 a shared object. Note that we have already handled the case in
1504 which a new common symbol should simply override the definition
1505 in the shared library. */
1508 && bfd_is_com_section (sec
)
1511 /* It would be best if we could set the hash table entry to a
1512 common symbol, but we don't know what to use for the section
1513 or the alignment. */
1514 if (! ((*info
->callbacks
->multiple_common
)
1515 (info
, &h
->root
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1518 /* If the presumed common symbol in the dynamic object is
1519 larger, pretend that the new symbol has its size. */
1521 if (h
->size
> *pvalue
)
1524 /* We need to remember the alignment required by the symbol
1525 in the dynamic object. */
1526 BFD_ASSERT (pold_alignment
);
1527 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1530 olddyncommon
= FALSE
;
1532 h
->root
.type
= bfd_link_hash_undefined
;
1533 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1535 *size_change_ok
= TRUE
;
1536 *type_change_ok
= TRUE
;
1538 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1541 h
->verinfo
.vertree
= NULL
;
1546 /* Handle the case where we had a versioned symbol in a dynamic
1547 library and now find a definition in a normal object. In this
1548 case, we make the versioned symbol point to the normal one. */
1549 flip
->root
.type
= h
->root
.type
;
1550 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1551 h
->root
.type
= bfd_link_hash_indirect
;
1552 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1553 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1557 flip
->ref_dynamic
= 1;
1564 /* This function is called to create an indirect symbol from the
1565 default for the symbol with the default version if needed. The
1566 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1567 set DYNSYM if the new indirect symbol is dynamic. */
1570 _bfd_elf_add_default_symbol (bfd
*abfd
,
1571 struct bfd_link_info
*info
,
1572 struct elf_link_hash_entry
*h
,
1574 Elf_Internal_Sym
*sym
,
1577 bfd_boolean
*dynsym
,
1578 bfd_boolean override
)
1580 bfd_boolean type_change_ok
;
1581 bfd_boolean size_change_ok
;
1584 struct elf_link_hash_entry
*hi
;
1585 struct bfd_link_hash_entry
*bh
;
1586 const struct elf_backend_data
*bed
;
1587 bfd_boolean collect
;
1588 bfd_boolean dynamic
;
1590 size_t len
, shortlen
;
1593 /* If this symbol has a version, and it is the default version, we
1594 create an indirect symbol from the default name to the fully
1595 decorated name. This will cause external references which do not
1596 specify a version to be bound to this version of the symbol. */
1597 p
= strchr (name
, ELF_VER_CHR
);
1598 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1603 /* We are overridden by an old definition. We need to check if we
1604 need to create the indirect symbol from the default name. */
1605 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1607 BFD_ASSERT (hi
!= NULL
);
1610 while (hi
->root
.type
== bfd_link_hash_indirect
1611 || hi
->root
.type
== bfd_link_hash_warning
)
1613 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1619 bed
= get_elf_backend_data (abfd
);
1620 collect
= bed
->collect
;
1621 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1623 shortlen
= p
- name
;
1624 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1625 if (shortname
== NULL
)
1627 memcpy (shortname
, name
, shortlen
);
1628 shortname
[shortlen
] = '\0';
1630 /* We are going to create a new symbol. Merge it with any existing
1631 symbol with this name. For the purposes of the merge, act as
1632 though we were defining the symbol we just defined, although we
1633 actually going to define an indirect symbol. */
1634 type_change_ok
= FALSE
;
1635 size_change_ok
= FALSE
;
1637 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1638 NULL
, &hi
, &skip
, &override
,
1639 &type_change_ok
, &size_change_ok
))
1648 if (! (_bfd_generic_link_add_one_symbol
1649 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1650 0, name
, FALSE
, collect
, &bh
)))
1652 hi
= (struct elf_link_hash_entry
*) bh
;
1656 /* In this case the symbol named SHORTNAME is overriding the
1657 indirect symbol we want to add. We were planning on making
1658 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1659 is the name without a version. NAME is the fully versioned
1660 name, and it is the default version.
1662 Overriding means that we already saw a definition for the
1663 symbol SHORTNAME in a regular object, and it is overriding
1664 the symbol defined in the dynamic object.
1666 When this happens, we actually want to change NAME, the
1667 symbol we just added, to refer to SHORTNAME. This will cause
1668 references to NAME in the shared object to become references
1669 to SHORTNAME in the regular object. This is what we expect
1670 when we override a function in a shared object: that the
1671 references in the shared object will be mapped to the
1672 definition in the regular object. */
1674 while (hi
->root
.type
== bfd_link_hash_indirect
1675 || hi
->root
.type
== bfd_link_hash_warning
)
1676 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1678 h
->root
.type
= bfd_link_hash_indirect
;
1679 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1683 hi
->ref_dynamic
= 1;
1687 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1692 /* Now set HI to H, so that the following code will set the
1693 other fields correctly. */
1697 /* Check if HI is a warning symbol. */
1698 if (hi
->root
.type
== bfd_link_hash_warning
)
1699 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1701 /* If there is a duplicate definition somewhere, then HI may not
1702 point to an indirect symbol. We will have reported an error to
1703 the user in that case. */
1705 if (hi
->root
.type
== bfd_link_hash_indirect
)
1707 struct elf_link_hash_entry
*ht
;
1709 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1710 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1712 /* See if the new flags lead us to realize that the symbol must
1718 if (! info
->executable
1724 if (hi
->ref_regular
)
1730 /* We also need to define an indirection from the nondefault version
1734 len
= strlen (name
);
1735 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1736 if (shortname
== NULL
)
1738 memcpy (shortname
, name
, shortlen
);
1739 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1741 /* Once again, merge with any existing symbol. */
1742 type_change_ok
= FALSE
;
1743 size_change_ok
= FALSE
;
1745 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1746 NULL
, &hi
, &skip
, &override
,
1747 &type_change_ok
, &size_change_ok
))
1755 /* Here SHORTNAME is a versioned name, so we don't expect to see
1756 the type of override we do in the case above unless it is
1757 overridden by a versioned definition. */
1758 if (hi
->root
.type
!= bfd_link_hash_defined
1759 && hi
->root
.type
!= bfd_link_hash_defweak
)
1760 (*_bfd_error_handler
)
1761 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1767 if (! (_bfd_generic_link_add_one_symbol
1768 (info
, abfd
, shortname
, BSF_INDIRECT
,
1769 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1771 hi
= (struct elf_link_hash_entry
*) bh
;
1773 /* If there is a duplicate definition somewhere, then HI may not
1774 point to an indirect symbol. We will have reported an error
1775 to the user in that case. */
1777 if (hi
->root
.type
== bfd_link_hash_indirect
)
1779 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1781 /* See if the new flags lead us to realize that the symbol
1787 if (! info
->executable
1793 if (hi
->ref_regular
)
1803 /* This routine is used to export all defined symbols into the dynamic
1804 symbol table. It is called via elf_link_hash_traverse. */
1807 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1809 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1811 /* Ignore this if we won't export it. */
1812 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1815 /* Ignore indirect symbols. These are added by the versioning code. */
1816 if (h
->root
.type
== bfd_link_hash_indirect
)
1819 if (h
->root
.type
== bfd_link_hash_warning
)
1820 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1822 if (h
->dynindx
== -1
1828 if (eif
->verdefs
== NULL
1829 || (bfd_find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1832 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1843 /* Look through the symbols which are defined in other shared
1844 libraries and referenced here. Update the list of version
1845 dependencies. This will be put into the .gnu.version_r section.
1846 This function is called via elf_link_hash_traverse. */
1849 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1852 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
1853 Elf_Internal_Verneed
*t
;
1854 Elf_Internal_Vernaux
*a
;
1857 if (h
->root
.type
== bfd_link_hash_warning
)
1858 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1860 /* We only care about symbols defined in shared objects with version
1865 || h
->verinfo
.verdef
== NULL
)
1868 /* See if we already know about this version. */
1869 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1873 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1877 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1883 /* This is a new version. Add it to tree we are building. */
1888 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1891 rinfo
->failed
= TRUE
;
1895 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1896 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1897 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1901 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1904 rinfo
->failed
= TRUE
;
1908 /* Note that we are copying a string pointer here, and testing it
1909 above. If bfd_elf_string_from_elf_section is ever changed to
1910 discard the string data when low in memory, this will have to be
1912 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1914 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1915 a
->vna_nextptr
= t
->vn_auxptr
;
1917 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1920 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1927 /* Figure out appropriate versions for all the symbols. We may not
1928 have the version number script until we have read all of the input
1929 files, so until that point we don't know which symbols should be
1930 local. This function is called via elf_link_hash_traverse. */
1933 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1935 struct elf_info_failed
*sinfo
;
1936 struct bfd_link_info
*info
;
1937 const struct elf_backend_data
*bed
;
1938 struct elf_info_failed eif
;
1942 sinfo
= (struct elf_info_failed
*) data
;
1945 if (h
->root
.type
== bfd_link_hash_warning
)
1946 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1948 /* Fix the symbol flags. */
1951 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1954 sinfo
->failed
= TRUE
;
1958 /* We only need version numbers for symbols defined in regular
1960 if (!h
->def_regular
)
1963 bed
= get_elf_backend_data (info
->output_bfd
);
1964 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1965 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1967 struct bfd_elf_version_tree
*t
;
1972 /* There are two consecutive ELF_VER_CHR characters if this is
1973 not a hidden symbol. */
1975 if (*p
== ELF_VER_CHR
)
1981 /* If there is no version string, we can just return out. */
1989 /* Look for the version. If we find it, it is no longer weak. */
1990 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1992 if (strcmp (t
->name
, p
) == 0)
1996 struct bfd_elf_version_expr
*d
;
1998 len
= p
- h
->root
.root
.string
;
1999 alc
= (char *) bfd_malloc (len
);
2002 sinfo
->failed
= TRUE
;
2005 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2006 alc
[len
- 1] = '\0';
2007 if (alc
[len
- 2] == ELF_VER_CHR
)
2008 alc
[len
- 2] = '\0';
2010 h
->verinfo
.vertree
= t
;
2014 if (t
->globals
.list
!= NULL
)
2015 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2017 /* See if there is anything to force this symbol to
2019 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2021 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2024 && ! info
->export_dynamic
)
2025 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2033 /* If we are building an application, we need to create a
2034 version node for this version. */
2035 if (t
== NULL
&& info
->executable
)
2037 struct bfd_elf_version_tree
**pp
;
2040 /* If we aren't going to export this symbol, we don't need
2041 to worry about it. */
2042 if (h
->dynindx
== -1)
2046 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
, amt
);
2049 sinfo
->failed
= TRUE
;
2054 t
->name_indx
= (unsigned int) -1;
2058 /* Don't count anonymous version tag. */
2059 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2061 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2063 t
->vernum
= version_index
;
2067 h
->verinfo
.vertree
= t
;
2071 /* We could not find the version for a symbol when
2072 generating a shared archive. Return an error. */
2073 (*_bfd_error_handler
)
2074 (_("%B: version node not found for symbol %s"),
2075 info
->output_bfd
, h
->root
.root
.string
);
2076 bfd_set_error (bfd_error_bad_value
);
2077 sinfo
->failed
= TRUE
;
2085 /* If we don't have a version for this symbol, see if we can find
2087 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2091 h
->verinfo
.vertree
= bfd_find_version_for_sym (sinfo
->verdefs
,
2092 h
->root
.root
.string
, &hide
);
2093 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2094 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2100 /* Read and swap the relocs from the section indicated by SHDR. This
2101 may be either a REL or a RELA section. The relocations are
2102 translated into RELA relocations and stored in INTERNAL_RELOCS,
2103 which should have already been allocated to contain enough space.
2104 The EXTERNAL_RELOCS are a buffer where the external form of the
2105 relocations should be stored.
2107 Returns FALSE if something goes wrong. */
2110 elf_link_read_relocs_from_section (bfd
*abfd
,
2112 Elf_Internal_Shdr
*shdr
,
2113 void *external_relocs
,
2114 Elf_Internal_Rela
*internal_relocs
)
2116 const struct elf_backend_data
*bed
;
2117 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2118 const bfd_byte
*erela
;
2119 const bfd_byte
*erelaend
;
2120 Elf_Internal_Rela
*irela
;
2121 Elf_Internal_Shdr
*symtab_hdr
;
2124 /* Position ourselves at the start of the section. */
2125 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2128 /* Read the relocations. */
2129 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2132 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2133 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2135 bed
= get_elf_backend_data (abfd
);
2137 /* Convert the external relocations to the internal format. */
2138 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2139 swap_in
= bed
->s
->swap_reloc_in
;
2140 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2141 swap_in
= bed
->s
->swap_reloca_in
;
2144 bfd_set_error (bfd_error_wrong_format
);
2148 erela
= (const bfd_byte
*) external_relocs
;
2149 erelaend
= erela
+ shdr
->sh_size
;
2150 irela
= internal_relocs
;
2151 while (erela
< erelaend
)
2155 (*swap_in
) (abfd
, erela
, irela
);
2156 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2157 if (bed
->s
->arch_size
== 64)
2161 if ((size_t) r_symndx
>= nsyms
)
2163 (*_bfd_error_handler
)
2164 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2165 " for offset 0x%lx in section `%A'"),
2167 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2168 bfd_set_error (bfd_error_bad_value
);
2172 else if (r_symndx
!= STN_UNDEF
)
2174 (*_bfd_error_handler
)
2175 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2176 " when the object file has no symbol table"),
2178 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2179 bfd_set_error (bfd_error_bad_value
);
2182 irela
+= bed
->s
->int_rels_per_ext_rel
;
2183 erela
+= shdr
->sh_entsize
;
2189 /* Read and swap the relocs for a section O. They may have been
2190 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2191 not NULL, they are used as buffers to read into. They are known to
2192 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2193 the return value is allocated using either malloc or bfd_alloc,
2194 according to the KEEP_MEMORY argument. If O has two relocation
2195 sections (both REL and RELA relocations), then the REL_HDR
2196 relocations will appear first in INTERNAL_RELOCS, followed by the
2197 RELA_HDR relocations. */
2200 _bfd_elf_link_read_relocs (bfd
*abfd
,
2202 void *external_relocs
,
2203 Elf_Internal_Rela
*internal_relocs
,
2204 bfd_boolean keep_memory
)
2206 void *alloc1
= NULL
;
2207 Elf_Internal_Rela
*alloc2
= NULL
;
2208 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2209 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2210 Elf_Internal_Rela
*internal_rela_relocs
;
2212 if (esdo
->relocs
!= NULL
)
2213 return esdo
->relocs
;
2215 if (o
->reloc_count
== 0)
2218 if (internal_relocs
== NULL
)
2222 size
= o
->reloc_count
;
2223 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2225 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2227 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2228 if (internal_relocs
== NULL
)
2232 if (external_relocs
== NULL
)
2234 bfd_size_type size
= 0;
2237 size
+= esdo
->rel
.hdr
->sh_size
;
2239 size
+= esdo
->rela
.hdr
->sh_size
;
2241 alloc1
= bfd_malloc (size
);
2244 external_relocs
= alloc1
;
2247 internal_rela_relocs
= internal_relocs
;
2250 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2254 external_relocs
= (((bfd_byte
*) external_relocs
)
2255 + esdo
->rel
.hdr
->sh_size
);
2256 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2257 * bed
->s
->int_rels_per_ext_rel
);
2261 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2263 internal_rela_relocs
)))
2266 /* Cache the results for next time, if we can. */
2268 esdo
->relocs
= internal_relocs
;
2273 /* Don't free alloc2, since if it was allocated we are passing it
2274 back (under the name of internal_relocs). */
2276 return internal_relocs
;
2284 bfd_release (abfd
, alloc2
);
2291 /* Compute the size of, and allocate space for, REL_HDR which is the
2292 section header for a section containing relocations for O. */
2295 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2296 struct bfd_elf_section_reloc_data
*reldata
)
2298 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2300 /* That allows us to calculate the size of the section. */
2301 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2303 /* The contents field must last into write_object_contents, so we
2304 allocate it with bfd_alloc rather than malloc. Also since we
2305 cannot be sure that the contents will actually be filled in,
2306 we zero the allocated space. */
2307 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2308 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2311 if (reldata
->hashes
== NULL
&& reldata
->count
)
2313 struct elf_link_hash_entry
**p
;
2315 p
= (struct elf_link_hash_entry
**)
2316 bfd_zmalloc (reldata
->count
* sizeof (struct elf_link_hash_entry
*));
2320 reldata
->hashes
= p
;
2326 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2327 originated from the section given by INPUT_REL_HDR) to the
2331 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2332 asection
*input_section
,
2333 Elf_Internal_Shdr
*input_rel_hdr
,
2334 Elf_Internal_Rela
*internal_relocs
,
2335 struct elf_link_hash_entry
**rel_hash
2338 Elf_Internal_Rela
*irela
;
2339 Elf_Internal_Rela
*irelaend
;
2341 struct bfd_elf_section_reloc_data
*output_reldata
;
2342 asection
*output_section
;
2343 const struct elf_backend_data
*bed
;
2344 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2345 struct bfd_elf_section_data
*esdo
;
2347 output_section
= input_section
->output_section
;
2349 bed
= get_elf_backend_data (output_bfd
);
2350 esdo
= elf_section_data (output_section
);
2351 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2353 output_reldata
= &esdo
->rel
;
2354 swap_out
= bed
->s
->swap_reloc_out
;
2356 else if (esdo
->rela
.hdr
2357 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2359 output_reldata
= &esdo
->rela
;
2360 swap_out
= bed
->s
->swap_reloca_out
;
2364 (*_bfd_error_handler
)
2365 (_("%B: relocation size mismatch in %B section %A"),
2366 output_bfd
, input_section
->owner
, input_section
);
2367 bfd_set_error (bfd_error_wrong_format
);
2371 erel
= output_reldata
->hdr
->contents
;
2372 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2373 irela
= internal_relocs
;
2374 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2375 * bed
->s
->int_rels_per_ext_rel
);
2376 while (irela
< irelaend
)
2378 (*swap_out
) (output_bfd
, irela
, erel
);
2379 irela
+= bed
->s
->int_rels_per_ext_rel
;
2380 erel
+= input_rel_hdr
->sh_entsize
;
2383 /* Bump the counter, so that we know where to add the next set of
2385 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2390 /* Make weak undefined symbols in PIE dynamic. */
2393 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2394 struct elf_link_hash_entry
*h
)
2398 && h
->root
.type
== bfd_link_hash_undefweak
)
2399 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2404 /* Fix up the flags for a symbol. This handles various cases which
2405 can only be fixed after all the input files are seen. This is
2406 currently called by both adjust_dynamic_symbol and
2407 assign_sym_version, which is unnecessary but perhaps more robust in
2408 the face of future changes. */
2411 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2412 struct elf_info_failed
*eif
)
2414 const struct elf_backend_data
*bed
;
2416 /* If this symbol was mentioned in a non-ELF file, try to set
2417 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2418 permit a non-ELF file to correctly refer to a symbol defined in
2419 an ELF dynamic object. */
2422 while (h
->root
.type
== bfd_link_hash_indirect
)
2423 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2425 if (h
->root
.type
!= bfd_link_hash_defined
2426 && h
->root
.type
!= bfd_link_hash_defweak
)
2429 h
->ref_regular_nonweak
= 1;
2433 if (h
->root
.u
.def
.section
->owner
!= NULL
2434 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2435 == bfd_target_elf_flavour
))
2438 h
->ref_regular_nonweak
= 1;
2444 if (h
->dynindx
== -1
2448 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2457 /* Unfortunately, NON_ELF is only correct if the symbol
2458 was first seen in a non-ELF file. Fortunately, if the symbol
2459 was first seen in an ELF file, we're probably OK unless the
2460 symbol was defined in a non-ELF file. Catch that case here.
2461 FIXME: We're still in trouble if the symbol was first seen in
2462 a dynamic object, and then later in a non-ELF regular object. */
2463 if ((h
->root
.type
== bfd_link_hash_defined
2464 || h
->root
.type
== bfd_link_hash_defweak
)
2466 && (h
->root
.u
.def
.section
->owner
!= NULL
2467 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2468 != bfd_target_elf_flavour
)
2469 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2470 && !h
->def_dynamic
)))
2474 /* Backend specific symbol fixup. */
2475 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2476 if (bed
->elf_backend_fixup_symbol
2477 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2480 /* If this is a final link, and the symbol was defined as a common
2481 symbol in a regular object file, and there was no definition in
2482 any dynamic object, then the linker will have allocated space for
2483 the symbol in a common section but the DEF_REGULAR
2484 flag will not have been set. */
2485 if (h
->root
.type
== bfd_link_hash_defined
2489 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2492 /* If -Bsymbolic was used (which means to bind references to global
2493 symbols to the definition within the shared object), and this
2494 symbol was defined in a regular object, then it actually doesn't
2495 need a PLT entry. Likewise, if the symbol has non-default
2496 visibility. If the symbol has hidden or internal visibility, we
2497 will force it local. */
2499 && eif
->info
->shared
2500 && is_elf_hash_table (eif
->info
->hash
)
2501 && (SYMBOLIC_BIND (eif
->info
, h
)
2502 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2505 bfd_boolean force_local
;
2507 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2508 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2509 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2512 /* If a weak undefined symbol has non-default visibility, we also
2513 hide it from the dynamic linker. */
2514 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2515 && h
->root
.type
== bfd_link_hash_undefweak
)
2516 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2518 /* If this is a weak defined symbol in a dynamic object, and we know
2519 the real definition in the dynamic object, copy interesting flags
2520 over to the real definition. */
2521 if (h
->u
.weakdef
!= NULL
)
2523 struct elf_link_hash_entry
*weakdef
;
2525 weakdef
= h
->u
.weakdef
;
2526 if (h
->root
.type
== bfd_link_hash_indirect
)
2527 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2529 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2530 || h
->root
.type
== bfd_link_hash_defweak
);
2531 BFD_ASSERT (weakdef
->def_dynamic
);
2533 /* If the real definition is defined by a regular object file,
2534 don't do anything special. See the longer description in
2535 _bfd_elf_adjust_dynamic_symbol, below. */
2536 if (weakdef
->def_regular
)
2537 h
->u
.weakdef
= NULL
;
2540 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2541 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2542 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2549 /* Make the backend pick a good value for a dynamic symbol. This is
2550 called via elf_link_hash_traverse, and also calls itself
2554 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2556 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2558 const struct elf_backend_data
*bed
;
2560 if (! is_elf_hash_table (eif
->info
->hash
))
2563 if (h
->root
.type
== bfd_link_hash_warning
)
2565 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2566 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2568 /* When warning symbols are created, they **replace** the "real"
2569 entry in the hash table, thus we never get to see the real
2570 symbol in a hash traversal. So look at it now. */
2571 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2574 /* Ignore indirect symbols. These are added by the versioning code. */
2575 if (h
->root
.type
== bfd_link_hash_indirect
)
2578 /* Fix the symbol flags. */
2579 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2582 /* If this symbol does not require a PLT entry, and it is not
2583 defined by a dynamic object, or is not referenced by a regular
2584 object, ignore it. We do have to handle a weak defined symbol,
2585 even if no regular object refers to it, if we decided to add it
2586 to the dynamic symbol table. FIXME: Do we normally need to worry
2587 about symbols which are defined by one dynamic object and
2588 referenced by another one? */
2590 && h
->type
!= STT_GNU_IFUNC
2594 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2596 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2600 /* If we've already adjusted this symbol, don't do it again. This
2601 can happen via a recursive call. */
2602 if (h
->dynamic_adjusted
)
2605 /* Don't look at this symbol again. Note that we must set this
2606 after checking the above conditions, because we may look at a
2607 symbol once, decide not to do anything, and then get called
2608 recursively later after REF_REGULAR is set below. */
2609 h
->dynamic_adjusted
= 1;
2611 /* If this is a weak definition, and we know a real definition, and
2612 the real symbol is not itself defined by a regular object file,
2613 then get a good value for the real definition. We handle the
2614 real symbol first, for the convenience of the backend routine.
2616 Note that there is a confusing case here. If the real definition
2617 is defined by a regular object file, we don't get the real symbol
2618 from the dynamic object, but we do get the weak symbol. If the
2619 processor backend uses a COPY reloc, then if some routine in the
2620 dynamic object changes the real symbol, we will not see that
2621 change in the corresponding weak symbol. This is the way other
2622 ELF linkers work as well, and seems to be a result of the shared
2625 I will clarify this issue. Most SVR4 shared libraries define the
2626 variable _timezone and define timezone as a weak synonym. The
2627 tzset call changes _timezone. If you write
2628 extern int timezone;
2630 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2631 you might expect that, since timezone is a synonym for _timezone,
2632 the same number will print both times. However, if the processor
2633 backend uses a COPY reloc, then actually timezone will be copied
2634 into your process image, and, since you define _timezone
2635 yourself, _timezone will not. Thus timezone and _timezone will
2636 wind up at different memory locations. The tzset call will set
2637 _timezone, leaving timezone unchanged. */
2639 if (h
->u
.weakdef
!= NULL
)
2641 /* If we get to this point, we know there is an implicit
2642 reference by a regular object file via the weak symbol H.
2643 FIXME: Is this really true? What if the traversal finds
2644 H->U.WEAKDEF before it finds H? */
2645 h
->u
.weakdef
->ref_regular
= 1;
2647 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2651 /* If a symbol has no type and no size and does not require a PLT
2652 entry, then we are probably about to do the wrong thing here: we
2653 are probably going to create a COPY reloc for an empty object.
2654 This case can arise when a shared object is built with assembly
2655 code, and the assembly code fails to set the symbol type. */
2657 && h
->type
== STT_NOTYPE
2659 (*_bfd_error_handler
)
2660 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2661 h
->root
.root
.string
);
2663 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2664 bed
= get_elf_backend_data (dynobj
);
2666 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2675 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2679 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2682 unsigned int power_of_two
;
2684 asection
*sec
= h
->root
.u
.def
.section
;
2686 /* The section aligment of definition is the maximum alignment
2687 requirement of symbols defined in the section. Since we don't
2688 know the symbol alignment requirement, we start with the
2689 maximum alignment and check low bits of the symbol address
2690 for the minimum alignment. */
2691 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2692 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2693 while ((h
->root
.u
.def
.value
& mask
) != 0)
2699 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2702 /* Adjust the section alignment if needed. */
2703 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2708 /* We make sure that the symbol will be aligned properly. */
2709 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2711 /* Define the symbol as being at this point in DYNBSS. */
2712 h
->root
.u
.def
.section
= dynbss
;
2713 h
->root
.u
.def
.value
= dynbss
->size
;
2715 /* Increment the size of DYNBSS to make room for the symbol. */
2716 dynbss
->size
+= h
->size
;
2721 /* Adjust all external symbols pointing into SEC_MERGE sections
2722 to reflect the object merging within the sections. */
2725 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2729 if (h
->root
.type
== bfd_link_hash_warning
)
2730 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2732 if ((h
->root
.type
== bfd_link_hash_defined
2733 || h
->root
.type
== bfd_link_hash_defweak
)
2734 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2735 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2737 bfd
*output_bfd
= (bfd
*) data
;
2739 h
->root
.u
.def
.value
=
2740 _bfd_merged_section_offset (output_bfd
,
2741 &h
->root
.u
.def
.section
,
2742 elf_section_data (sec
)->sec_info
,
2743 h
->root
.u
.def
.value
);
2749 /* Returns false if the symbol referred to by H should be considered
2750 to resolve local to the current module, and true if it should be
2751 considered to bind dynamically. */
2754 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2755 struct bfd_link_info
*info
,
2756 bfd_boolean not_local_protected
)
2758 bfd_boolean binding_stays_local_p
;
2759 const struct elf_backend_data
*bed
;
2760 struct elf_link_hash_table
*hash_table
;
2765 while (h
->root
.type
== bfd_link_hash_indirect
2766 || h
->root
.type
== bfd_link_hash_warning
)
2767 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2769 /* If it was forced local, then clearly it's not dynamic. */
2770 if (h
->dynindx
== -1)
2772 if (h
->forced_local
)
2775 /* Identify the cases where name binding rules say that a
2776 visible symbol resolves locally. */
2777 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2779 switch (ELF_ST_VISIBILITY (h
->other
))
2786 hash_table
= elf_hash_table (info
);
2787 if (!is_elf_hash_table (hash_table
))
2790 bed
= get_elf_backend_data (hash_table
->dynobj
);
2792 /* Proper resolution for function pointer equality may require
2793 that these symbols perhaps be resolved dynamically, even though
2794 we should be resolving them to the current module. */
2795 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
2796 binding_stays_local_p
= TRUE
;
2803 /* If it isn't defined locally, then clearly it's dynamic. */
2804 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2807 /* Otherwise, the symbol is dynamic if binding rules don't tell
2808 us that it remains local. */
2809 return !binding_stays_local_p
;
2812 /* Return true if the symbol referred to by H should be considered
2813 to resolve local to the current module, and false otherwise. Differs
2814 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2815 undefined symbols. The two functions are virtually identical except
2816 for the place where forced_local and dynindx == -1 are tested. If
2817 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2818 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2819 the symbol is local only for defined symbols.
2820 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2821 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2822 treatment of undefined weak symbols. For those that do not make
2823 undefined weak symbols dynamic, both functions may return false. */
2826 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2827 struct bfd_link_info
*info
,
2828 bfd_boolean local_protected
)
2830 const struct elf_backend_data
*bed
;
2831 struct elf_link_hash_table
*hash_table
;
2833 /* If it's a local sym, of course we resolve locally. */
2837 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2838 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2839 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2842 /* Common symbols that become definitions don't get the DEF_REGULAR
2843 flag set, so test it first, and don't bail out. */
2844 if (ELF_COMMON_DEF_P (h
))
2846 /* If we don't have a definition in a regular file, then we can't
2847 resolve locally. The sym is either undefined or dynamic. */
2848 else if (!h
->def_regular
)
2851 /* Forced local symbols resolve locally. */
2852 if (h
->forced_local
)
2855 /* As do non-dynamic symbols. */
2856 if (h
->dynindx
== -1)
2859 /* At this point, we know the symbol is defined and dynamic. In an
2860 executable it must resolve locally, likewise when building symbolic
2861 shared libraries. */
2862 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2865 /* Now deal with defined dynamic symbols in shared libraries. Ones
2866 with default visibility might not resolve locally. */
2867 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2870 hash_table
= elf_hash_table (info
);
2871 if (!is_elf_hash_table (hash_table
))
2874 bed
= get_elf_backend_data (hash_table
->dynobj
);
2876 /* STV_PROTECTED non-function symbols are local. */
2877 if (!bed
->is_function_type (h
->type
))
2880 /* Function pointer equality tests may require that STV_PROTECTED
2881 symbols be treated as dynamic symbols, even when we know that the
2882 dynamic linker will resolve them locally. */
2883 return local_protected
;
2886 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2887 aligned. Returns the first TLS output section. */
2889 struct bfd_section
*
2890 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2892 struct bfd_section
*sec
, *tls
;
2893 unsigned int align
= 0;
2895 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2896 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2900 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2901 if (sec
->alignment_power
> align
)
2902 align
= sec
->alignment_power
;
2904 elf_hash_table (info
)->tls_sec
= tls
;
2906 /* Ensure the alignment of the first section is the largest alignment,
2907 so that the tls segment starts aligned. */
2909 tls
->alignment_power
= align
;
2914 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2916 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2917 Elf_Internal_Sym
*sym
)
2919 const struct elf_backend_data
*bed
;
2921 /* Local symbols do not count, but target specific ones might. */
2922 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2923 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2926 bed
= get_elf_backend_data (abfd
);
2927 /* Function symbols do not count. */
2928 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2931 /* If the section is undefined, then so is the symbol. */
2932 if (sym
->st_shndx
== SHN_UNDEF
)
2935 /* If the symbol is defined in the common section, then
2936 it is a common definition and so does not count. */
2937 if (bed
->common_definition (sym
))
2940 /* If the symbol is in a target specific section then we
2941 must rely upon the backend to tell us what it is. */
2942 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2943 /* FIXME - this function is not coded yet:
2945 return _bfd_is_global_symbol_definition (abfd, sym);
2947 Instead for now assume that the definition is not global,
2948 Even if this is wrong, at least the linker will behave
2949 in the same way that it used to do. */
2955 /* Search the symbol table of the archive element of the archive ABFD
2956 whose archive map contains a mention of SYMDEF, and determine if
2957 the symbol is defined in this element. */
2959 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2961 Elf_Internal_Shdr
* hdr
;
2962 bfd_size_type symcount
;
2963 bfd_size_type extsymcount
;
2964 bfd_size_type extsymoff
;
2965 Elf_Internal_Sym
*isymbuf
;
2966 Elf_Internal_Sym
*isym
;
2967 Elf_Internal_Sym
*isymend
;
2970 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2974 if (! bfd_check_format (abfd
, bfd_object
))
2977 /* If we have already included the element containing this symbol in the
2978 link then we do not need to include it again. Just claim that any symbol
2979 it contains is not a definition, so that our caller will not decide to
2980 (re)include this element. */
2981 if (abfd
->archive_pass
)
2984 /* Select the appropriate symbol table. */
2985 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2986 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2988 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2990 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2992 /* The sh_info field of the symtab header tells us where the
2993 external symbols start. We don't care about the local symbols. */
2994 if (elf_bad_symtab (abfd
))
2996 extsymcount
= symcount
;
3001 extsymcount
= symcount
- hdr
->sh_info
;
3002 extsymoff
= hdr
->sh_info
;
3005 if (extsymcount
== 0)
3008 /* Read in the symbol table. */
3009 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3011 if (isymbuf
== NULL
)
3014 /* Scan the symbol table looking for SYMDEF. */
3016 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3020 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3025 if (strcmp (name
, symdef
->name
) == 0)
3027 result
= is_global_data_symbol_definition (abfd
, isym
);
3037 /* Add an entry to the .dynamic table. */
3040 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3044 struct elf_link_hash_table
*hash_table
;
3045 const struct elf_backend_data
*bed
;
3047 bfd_size_type newsize
;
3048 bfd_byte
*newcontents
;
3049 Elf_Internal_Dyn dyn
;
3051 hash_table
= elf_hash_table (info
);
3052 if (! is_elf_hash_table (hash_table
))
3055 bed
= get_elf_backend_data (hash_table
->dynobj
);
3056 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3057 BFD_ASSERT (s
!= NULL
);
3059 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3060 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3061 if (newcontents
== NULL
)
3065 dyn
.d_un
.d_val
= val
;
3066 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3069 s
->contents
= newcontents
;
3074 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3075 otherwise just check whether one already exists. Returns -1 on error,
3076 1 if a DT_NEEDED tag already exists, and 0 on success. */
3079 elf_add_dt_needed_tag (bfd
*abfd
,
3080 struct bfd_link_info
*info
,
3084 struct elf_link_hash_table
*hash_table
;
3085 bfd_size_type oldsize
;
3086 bfd_size_type strindex
;
3088 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3091 hash_table
= elf_hash_table (info
);
3092 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3093 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3094 if (strindex
== (bfd_size_type
) -1)
3097 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3100 const struct elf_backend_data
*bed
;
3103 bed
= get_elf_backend_data (hash_table
->dynobj
);
3104 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3106 for (extdyn
= sdyn
->contents
;
3107 extdyn
< sdyn
->contents
+ sdyn
->size
;
3108 extdyn
+= bed
->s
->sizeof_dyn
)
3110 Elf_Internal_Dyn dyn
;
3112 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3113 if (dyn
.d_tag
== DT_NEEDED
3114 && dyn
.d_un
.d_val
== strindex
)
3116 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3124 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3127 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3131 /* We were just checking for existence of the tag. */
3132 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3138 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3140 for (; needed
!= NULL
; needed
= needed
->next
)
3141 if (strcmp (soname
, needed
->name
) == 0)
3147 /* Sort symbol by value and section. */
3149 elf_sort_symbol (const void *arg1
, const void *arg2
)
3151 const struct elf_link_hash_entry
*h1
;
3152 const struct elf_link_hash_entry
*h2
;
3153 bfd_signed_vma vdiff
;
3155 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3156 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3157 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3159 return vdiff
> 0 ? 1 : -1;
3162 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3164 return sdiff
> 0 ? 1 : -1;
3169 /* This function is used to adjust offsets into .dynstr for
3170 dynamic symbols. This is called via elf_link_hash_traverse. */
3173 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3175 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3177 if (h
->root
.type
== bfd_link_hash_warning
)
3178 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3180 if (h
->dynindx
!= -1)
3181 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3185 /* Assign string offsets in .dynstr, update all structures referencing
3189 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3191 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3192 struct elf_link_local_dynamic_entry
*entry
;
3193 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3194 bfd
*dynobj
= hash_table
->dynobj
;
3197 const struct elf_backend_data
*bed
;
3200 _bfd_elf_strtab_finalize (dynstr
);
3201 size
= _bfd_elf_strtab_size (dynstr
);
3203 bed
= get_elf_backend_data (dynobj
);
3204 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3205 BFD_ASSERT (sdyn
!= NULL
);
3207 /* Update all .dynamic entries referencing .dynstr strings. */
3208 for (extdyn
= sdyn
->contents
;
3209 extdyn
< sdyn
->contents
+ sdyn
->size
;
3210 extdyn
+= bed
->s
->sizeof_dyn
)
3212 Elf_Internal_Dyn dyn
;
3214 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3218 dyn
.d_un
.d_val
= size
;
3228 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3233 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3236 /* Now update local dynamic symbols. */
3237 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3238 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3239 entry
->isym
.st_name
);
3241 /* And the rest of dynamic symbols. */
3242 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3244 /* Adjust version definitions. */
3245 if (elf_tdata (output_bfd
)->cverdefs
)
3250 Elf_Internal_Verdef def
;
3251 Elf_Internal_Verdaux defaux
;
3253 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3257 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3259 p
+= sizeof (Elf_External_Verdef
);
3260 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3262 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3264 _bfd_elf_swap_verdaux_in (output_bfd
,
3265 (Elf_External_Verdaux
*) p
, &defaux
);
3266 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3268 _bfd_elf_swap_verdaux_out (output_bfd
,
3269 &defaux
, (Elf_External_Verdaux
*) p
);
3270 p
+= sizeof (Elf_External_Verdaux
);
3273 while (def
.vd_next
);
3276 /* Adjust version references. */
3277 if (elf_tdata (output_bfd
)->verref
)
3282 Elf_Internal_Verneed need
;
3283 Elf_Internal_Vernaux needaux
;
3285 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3289 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3291 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3292 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3293 (Elf_External_Verneed
*) p
);
3294 p
+= sizeof (Elf_External_Verneed
);
3295 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3297 _bfd_elf_swap_vernaux_in (output_bfd
,
3298 (Elf_External_Vernaux
*) p
, &needaux
);
3299 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3301 _bfd_elf_swap_vernaux_out (output_bfd
,
3303 (Elf_External_Vernaux
*) p
);
3304 p
+= sizeof (Elf_External_Vernaux
);
3307 while (need
.vn_next
);
3313 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3314 The default is to only match when the INPUT and OUTPUT are exactly
3318 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3319 const bfd_target
*output
)
3321 return input
== output
;
3324 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3325 This version is used when different targets for the same architecture
3326 are virtually identical. */
3329 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3330 const bfd_target
*output
)
3332 const struct elf_backend_data
*obed
, *ibed
;
3334 if (input
== output
)
3337 ibed
= xvec_get_elf_backend_data (input
);
3338 obed
= xvec_get_elf_backend_data (output
);
3340 if (ibed
->arch
!= obed
->arch
)
3343 /* If both backends are using this function, deem them compatible. */
3344 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3347 /* Add symbols from an ELF object file to the linker hash table. */
3350 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3352 Elf_Internal_Ehdr
*ehdr
;
3353 Elf_Internal_Shdr
*hdr
;
3354 bfd_size_type symcount
;
3355 bfd_size_type extsymcount
;
3356 bfd_size_type extsymoff
;
3357 struct elf_link_hash_entry
**sym_hash
;
3358 bfd_boolean dynamic
;
3359 Elf_External_Versym
*extversym
= NULL
;
3360 Elf_External_Versym
*ever
;
3361 struct elf_link_hash_entry
*weaks
;
3362 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3363 bfd_size_type nondeflt_vers_cnt
= 0;
3364 Elf_Internal_Sym
*isymbuf
= NULL
;
3365 Elf_Internal_Sym
*isym
;
3366 Elf_Internal_Sym
*isymend
;
3367 const struct elf_backend_data
*bed
;
3368 bfd_boolean add_needed
;
3369 struct elf_link_hash_table
*htab
;
3371 void *alloc_mark
= NULL
;
3372 struct bfd_hash_entry
**old_table
= NULL
;
3373 unsigned int old_size
= 0;
3374 unsigned int old_count
= 0;
3375 void *old_tab
= NULL
;
3378 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3379 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3380 long old_dynsymcount
= 0;
3382 size_t hashsize
= 0;
3384 htab
= elf_hash_table (info
);
3385 bed
= get_elf_backend_data (abfd
);
3387 if ((abfd
->flags
& DYNAMIC
) == 0)
3393 /* You can't use -r against a dynamic object. Also, there's no
3394 hope of using a dynamic object which does not exactly match
3395 the format of the output file. */
3396 if (info
->relocatable
3397 || !is_elf_hash_table (htab
)
3398 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3400 if (info
->relocatable
)
3401 bfd_set_error (bfd_error_invalid_operation
);
3403 bfd_set_error (bfd_error_wrong_format
);
3408 ehdr
= elf_elfheader (abfd
);
3409 if (info
->warn_alternate_em
3410 && bed
->elf_machine_code
!= ehdr
->e_machine
3411 && ((bed
->elf_machine_alt1
!= 0
3412 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3413 || (bed
->elf_machine_alt2
!= 0
3414 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3415 info
->callbacks
->einfo
3416 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3417 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3419 /* As a GNU extension, any input sections which are named
3420 .gnu.warning.SYMBOL are treated as warning symbols for the given
3421 symbol. This differs from .gnu.warning sections, which generate
3422 warnings when they are included in an output file. */
3423 if (info
->executable
)
3427 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3431 name
= bfd_get_section_name (abfd
, s
);
3432 if (CONST_STRNEQ (name
, ".gnu.warning."))
3437 name
+= sizeof ".gnu.warning." - 1;
3439 /* If this is a shared object, then look up the symbol
3440 in the hash table. If it is there, and it is already
3441 been defined, then we will not be using the entry
3442 from this shared object, so we don't need to warn.
3443 FIXME: If we see the definition in a regular object
3444 later on, we will warn, but we shouldn't. The only
3445 fix is to keep track of what warnings we are supposed
3446 to emit, and then handle them all at the end of the
3450 struct elf_link_hash_entry
*h
;
3452 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3454 /* FIXME: What about bfd_link_hash_common? */
3456 && (h
->root
.type
== bfd_link_hash_defined
3457 || h
->root
.type
== bfd_link_hash_defweak
))
3459 /* We don't want to issue this warning. Clobber
3460 the section size so that the warning does not
3461 get copied into the output file. */
3468 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3472 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3477 if (! (_bfd_generic_link_add_one_symbol
3478 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3479 FALSE
, bed
->collect
, NULL
)))
3482 if (! info
->relocatable
)
3484 /* Clobber the section size so that the warning does
3485 not get copied into the output file. */
3488 /* Also set SEC_EXCLUDE, so that symbols defined in
3489 the warning section don't get copied to the output. */
3490 s
->flags
|= SEC_EXCLUDE
;
3499 /* If we are creating a shared library, create all the dynamic
3500 sections immediately. We need to attach them to something,
3501 so we attach them to this BFD, provided it is the right
3502 format. FIXME: If there are no input BFD's of the same
3503 format as the output, we can't make a shared library. */
3505 && is_elf_hash_table (htab
)
3506 && info
->output_bfd
->xvec
== abfd
->xvec
3507 && !htab
->dynamic_sections_created
)
3509 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3513 else if (!is_elf_hash_table (htab
))
3518 const char *soname
= NULL
;
3520 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3523 /* ld --just-symbols and dynamic objects don't mix very well.
3524 ld shouldn't allow it. */
3525 if ((s
= abfd
->sections
) != NULL
3526 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3529 /* If this dynamic lib was specified on the command line with
3530 --as-needed in effect, then we don't want to add a DT_NEEDED
3531 tag unless the lib is actually used. Similary for libs brought
3532 in by another lib's DT_NEEDED. When --no-add-needed is used
3533 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3534 any dynamic library in DT_NEEDED tags in the dynamic lib at
3536 add_needed
= (elf_dyn_lib_class (abfd
)
3537 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3538 | DYN_NO_NEEDED
)) == 0;
3540 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3545 unsigned int elfsec
;
3546 unsigned long shlink
;
3548 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3555 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3556 if (elfsec
== SHN_BAD
)
3557 goto error_free_dyn
;
3558 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3560 for (extdyn
= dynbuf
;
3561 extdyn
< dynbuf
+ s
->size
;
3562 extdyn
+= bed
->s
->sizeof_dyn
)
3564 Elf_Internal_Dyn dyn
;
3566 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3567 if (dyn
.d_tag
== DT_SONAME
)
3569 unsigned int tagv
= dyn
.d_un
.d_val
;
3570 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3572 goto error_free_dyn
;
3574 if (dyn
.d_tag
== DT_NEEDED
)
3576 struct bfd_link_needed_list
*n
, **pn
;
3578 unsigned int tagv
= dyn
.d_un
.d_val
;
3580 amt
= sizeof (struct bfd_link_needed_list
);
3581 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3582 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3583 if (n
== NULL
|| fnm
== NULL
)
3584 goto error_free_dyn
;
3585 amt
= strlen (fnm
) + 1;
3586 anm
= (char *) bfd_alloc (abfd
, amt
);
3588 goto error_free_dyn
;
3589 memcpy (anm
, fnm
, amt
);
3593 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3597 if (dyn
.d_tag
== DT_RUNPATH
)
3599 struct bfd_link_needed_list
*n
, **pn
;
3601 unsigned int tagv
= dyn
.d_un
.d_val
;
3603 amt
= sizeof (struct bfd_link_needed_list
);
3604 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3605 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3606 if (n
== NULL
|| fnm
== NULL
)
3607 goto error_free_dyn
;
3608 amt
= strlen (fnm
) + 1;
3609 anm
= (char *) bfd_alloc (abfd
, amt
);
3611 goto error_free_dyn
;
3612 memcpy (anm
, fnm
, amt
);
3616 for (pn
= & runpath
;
3622 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3623 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3625 struct bfd_link_needed_list
*n
, **pn
;
3627 unsigned int tagv
= dyn
.d_un
.d_val
;
3629 amt
= sizeof (struct bfd_link_needed_list
);
3630 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3631 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3632 if (n
== NULL
|| fnm
== NULL
)
3633 goto error_free_dyn
;
3634 amt
= strlen (fnm
) + 1;
3635 anm
= (char *) bfd_alloc (abfd
, amt
);
3637 goto error_free_dyn
;
3638 memcpy (anm
, fnm
, amt
);
3648 if (dyn
.d_tag
== DT_AUDIT
)
3650 unsigned int tagv
= dyn
.d_un
.d_val
;
3651 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3658 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3659 frees all more recently bfd_alloc'd blocks as well. */
3665 struct bfd_link_needed_list
**pn
;
3666 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3671 /* We do not want to include any of the sections in a dynamic
3672 object in the output file. We hack by simply clobbering the
3673 list of sections in the BFD. This could be handled more
3674 cleanly by, say, a new section flag; the existing
3675 SEC_NEVER_LOAD flag is not the one we want, because that one
3676 still implies that the section takes up space in the output
3678 bfd_section_list_clear (abfd
);
3680 /* Find the name to use in a DT_NEEDED entry that refers to this
3681 object. If the object has a DT_SONAME entry, we use it.
3682 Otherwise, if the generic linker stuck something in
3683 elf_dt_name, we use that. Otherwise, we just use the file
3685 if (soname
== NULL
|| *soname
== '\0')
3687 soname
= elf_dt_name (abfd
);
3688 if (soname
== NULL
|| *soname
== '\0')
3689 soname
= bfd_get_filename (abfd
);
3692 /* Save the SONAME because sometimes the linker emulation code
3693 will need to know it. */
3694 elf_dt_name (abfd
) = soname
;
3696 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3700 /* If we have already included this dynamic object in the
3701 link, just ignore it. There is no reason to include a
3702 particular dynamic object more than once. */
3706 /* Save the DT_AUDIT entry for the linker emulation code. */
3707 elf_dt_audit (abfd
) = audit
;
3710 /* If this is a dynamic object, we always link against the .dynsym
3711 symbol table, not the .symtab symbol table. The dynamic linker
3712 will only see the .dynsym symbol table, so there is no reason to
3713 look at .symtab for a dynamic object. */
3715 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3716 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3718 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3720 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3722 /* The sh_info field of the symtab header tells us where the
3723 external symbols start. We don't care about the local symbols at
3725 if (elf_bad_symtab (abfd
))
3727 extsymcount
= symcount
;
3732 extsymcount
= symcount
- hdr
->sh_info
;
3733 extsymoff
= hdr
->sh_info
;
3737 if (extsymcount
!= 0)
3739 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3741 if (isymbuf
== NULL
)
3744 /* We store a pointer to the hash table entry for each external
3746 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3747 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
3748 if (sym_hash
== NULL
)
3749 goto error_free_sym
;
3750 elf_sym_hashes (abfd
) = sym_hash
;
3755 /* Read in any version definitions. */
3756 if (!_bfd_elf_slurp_version_tables (abfd
,
3757 info
->default_imported_symver
))
3758 goto error_free_sym
;
3760 /* Read in the symbol versions, but don't bother to convert them
3761 to internal format. */
3762 if (elf_dynversym (abfd
) != 0)
3764 Elf_Internal_Shdr
*versymhdr
;
3766 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3767 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
3768 if (extversym
== NULL
)
3769 goto error_free_sym
;
3770 amt
= versymhdr
->sh_size
;
3771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3772 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3773 goto error_free_vers
;
3777 /* If we are loading an as-needed shared lib, save the symbol table
3778 state before we start adding symbols. If the lib turns out
3779 to be unneeded, restore the state. */
3780 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3785 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3787 struct bfd_hash_entry
*p
;
3788 struct elf_link_hash_entry
*h
;
3790 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3792 h
= (struct elf_link_hash_entry
*) p
;
3793 entsize
+= htab
->root
.table
.entsize
;
3794 if (h
->root
.type
== bfd_link_hash_warning
)
3795 entsize
+= htab
->root
.table
.entsize
;
3799 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3800 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3801 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3802 if (old_tab
== NULL
)
3803 goto error_free_vers
;
3805 /* Remember the current objalloc pointer, so that all mem for
3806 symbols added can later be reclaimed. */
3807 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3808 if (alloc_mark
== NULL
)
3809 goto error_free_vers
;
3811 /* Make a special call to the linker "notice" function to
3812 tell it that we are about to handle an as-needed lib. */
3813 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3815 goto error_free_vers
;
3817 /* Clone the symbol table and sym hashes. Remember some
3818 pointers into the symbol table, and dynamic symbol count. */
3819 old_hash
= (char *) old_tab
+ tabsize
;
3820 old_ent
= (char *) old_hash
+ hashsize
;
3821 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3822 memcpy (old_hash
, sym_hash
, hashsize
);
3823 old_undefs
= htab
->root
.undefs
;
3824 old_undefs_tail
= htab
->root
.undefs_tail
;
3825 old_table
= htab
->root
.table
.table
;
3826 old_size
= htab
->root
.table
.size
;
3827 old_count
= htab
->root
.table
.count
;
3828 old_dynsymcount
= htab
->dynsymcount
;
3830 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3832 struct bfd_hash_entry
*p
;
3833 struct elf_link_hash_entry
*h
;
3835 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3837 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3838 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3839 h
= (struct elf_link_hash_entry
*) p
;
3840 if (h
->root
.type
== bfd_link_hash_warning
)
3842 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3843 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3850 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3851 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3853 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3857 asection
*sec
, *new_sec
;
3860 struct elf_link_hash_entry
*h
;
3861 bfd_boolean definition
;
3862 bfd_boolean size_change_ok
;
3863 bfd_boolean type_change_ok
;
3864 bfd_boolean new_weakdef
;
3865 bfd_boolean override
;
3867 unsigned int old_alignment
;
3869 bfd
* undef_bfd
= NULL
;
3873 flags
= BSF_NO_FLAGS
;
3875 value
= isym
->st_value
;
3877 common
= bed
->common_definition (isym
);
3879 bind
= ELF_ST_BIND (isym
->st_info
);
3883 /* This should be impossible, since ELF requires that all
3884 global symbols follow all local symbols, and that sh_info
3885 point to the first global symbol. Unfortunately, Irix 5
3890 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3898 case STB_GNU_UNIQUE
:
3899 flags
= BSF_GNU_UNIQUE
;
3903 /* Leave it up to the processor backend. */
3907 if (isym
->st_shndx
== SHN_UNDEF
)
3908 sec
= bfd_und_section_ptr
;
3909 else if (isym
->st_shndx
== SHN_ABS
)
3910 sec
= bfd_abs_section_ptr
;
3911 else if (isym
->st_shndx
== SHN_COMMON
)
3913 sec
= bfd_com_section_ptr
;
3914 /* What ELF calls the size we call the value. What ELF
3915 calls the value we call the alignment. */
3916 value
= isym
->st_size
;
3920 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3922 sec
= bfd_abs_section_ptr
;
3923 else if (sec
->kept_section
)
3925 /* Symbols from discarded section are undefined. We keep
3927 sec
= bfd_und_section_ptr
;
3928 isym
->st_shndx
= SHN_UNDEF
;
3930 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3934 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3937 goto error_free_vers
;
3939 if (isym
->st_shndx
== SHN_COMMON
3940 && (abfd
->flags
& BFD_PLUGIN
) != 0)
3942 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
3946 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
3948 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
3950 goto error_free_vers
;
3954 else if (isym
->st_shndx
== SHN_COMMON
3955 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3956 && !info
->relocatable
)
3958 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3962 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
3963 | SEC_LINKER_CREATED
);
3964 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
3966 goto error_free_vers
;
3970 else if (bed
->elf_add_symbol_hook
)
3972 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3974 goto error_free_vers
;
3976 /* The hook function sets the name to NULL if this symbol
3977 should be skipped for some reason. */
3982 /* Sanity check that all possibilities were handled. */
3985 bfd_set_error (bfd_error_bad_value
);
3986 goto error_free_vers
;
3989 if (bfd_is_und_section (sec
)
3990 || bfd_is_com_section (sec
))
3995 size_change_ok
= FALSE
;
3996 type_change_ok
= bed
->type_change_ok
;
4001 if (is_elf_hash_table (htab
))
4003 Elf_Internal_Versym iver
;
4004 unsigned int vernum
= 0;
4007 /* If this is a definition of a symbol which was previously
4008 referenced in a non-weak manner then make a note of the bfd
4009 that contained the reference. This is used if we need to
4010 refer to the source of the reference later on. */
4011 if (! bfd_is_und_section (sec
))
4013 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4016 && h
->root
.type
== bfd_link_hash_undefined
4017 && h
->root
.u
.undef
.abfd
)
4018 undef_bfd
= h
->root
.u
.undef
.abfd
;
4023 if (info
->default_imported_symver
)
4024 /* Use the default symbol version created earlier. */
4025 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4030 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4032 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4034 /* If this is a hidden symbol, or if it is not version
4035 1, we append the version name to the symbol name.
4036 However, we do not modify a non-hidden absolute symbol
4037 if it is not a function, because it might be the version
4038 symbol itself. FIXME: What if it isn't? */
4039 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4041 && (!bfd_is_abs_section (sec
)
4042 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4045 size_t namelen
, verlen
, newlen
;
4048 if (isym
->st_shndx
!= SHN_UNDEF
)
4050 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4052 else if (vernum
> 1)
4054 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4060 (*_bfd_error_handler
)
4061 (_("%B: %s: invalid version %u (max %d)"),
4063 elf_tdata (abfd
)->cverdefs
);
4064 bfd_set_error (bfd_error_bad_value
);
4065 goto error_free_vers
;
4070 /* We cannot simply test for the number of
4071 entries in the VERNEED section since the
4072 numbers for the needed versions do not start
4074 Elf_Internal_Verneed
*t
;
4077 for (t
= elf_tdata (abfd
)->verref
;
4081 Elf_Internal_Vernaux
*a
;
4083 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4085 if (a
->vna_other
== vernum
)
4087 verstr
= a
->vna_nodename
;
4096 (*_bfd_error_handler
)
4097 (_("%B: %s: invalid needed version %d"),
4098 abfd
, name
, vernum
);
4099 bfd_set_error (bfd_error_bad_value
);
4100 goto error_free_vers
;
4104 namelen
= strlen (name
);
4105 verlen
= strlen (verstr
);
4106 newlen
= namelen
+ verlen
+ 2;
4107 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4108 && isym
->st_shndx
!= SHN_UNDEF
)
4111 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4112 if (newname
== NULL
)
4113 goto error_free_vers
;
4114 memcpy (newname
, name
, namelen
);
4115 p
= newname
+ namelen
;
4117 /* If this is a defined non-hidden version symbol,
4118 we add another @ to the name. This indicates the
4119 default version of the symbol. */
4120 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4121 && isym
->st_shndx
!= SHN_UNDEF
)
4123 memcpy (p
, verstr
, verlen
+ 1);
4128 /* If necessary, make a second attempt to locate the bfd
4129 containing an unresolved, non-weak reference to the
4131 if (! bfd_is_und_section (sec
) && undef_bfd
== NULL
)
4133 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4136 && h
->root
.type
== bfd_link_hash_undefined
4137 && h
->root
.u
.undef
.abfd
)
4138 undef_bfd
= h
->root
.u
.undef
.abfd
;
4141 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4142 &value
, &old_alignment
,
4143 sym_hash
, &skip
, &override
,
4144 &type_change_ok
, &size_change_ok
))
4145 goto error_free_vers
;
4154 while (h
->root
.type
== bfd_link_hash_indirect
4155 || h
->root
.type
== bfd_link_hash_warning
)
4156 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4158 /* Remember the old alignment if this is a common symbol, so
4159 that we don't reduce the alignment later on. We can't
4160 check later, because _bfd_generic_link_add_one_symbol
4161 will set a default for the alignment which we want to
4162 override. We also remember the old bfd where the existing
4163 definition comes from. */
4164 switch (h
->root
.type
)
4169 case bfd_link_hash_defined
:
4170 case bfd_link_hash_defweak
:
4171 old_bfd
= h
->root
.u
.def
.section
->owner
;
4174 case bfd_link_hash_common
:
4175 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4176 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4180 if (elf_tdata (abfd
)->verdef
!= NULL
4184 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4187 if (! (_bfd_generic_link_add_one_symbol
4188 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4189 (struct bfd_link_hash_entry
**) sym_hash
)))
4190 goto error_free_vers
;
4193 while (h
->root
.type
== bfd_link_hash_indirect
4194 || h
->root
.type
== bfd_link_hash_warning
)
4195 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4198 if (is_elf_hash_table (htab
))
4199 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4201 new_weakdef
= FALSE
;
4204 && (flags
& BSF_WEAK
) != 0
4205 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4206 && is_elf_hash_table (htab
)
4207 && h
->u
.weakdef
== NULL
)
4209 /* Keep a list of all weak defined non function symbols from
4210 a dynamic object, using the weakdef field. Later in this
4211 function we will set the weakdef field to the correct
4212 value. We only put non-function symbols from dynamic
4213 objects on this list, because that happens to be the only
4214 time we need to know the normal symbol corresponding to a
4215 weak symbol, and the information is time consuming to
4216 figure out. If the weakdef field is not already NULL,
4217 then this symbol was already defined by some previous
4218 dynamic object, and we will be using that previous
4219 definition anyhow. */
4221 h
->u
.weakdef
= weaks
;
4226 /* Set the alignment of a common symbol. */
4227 if ((common
|| bfd_is_com_section (sec
))
4228 && h
->root
.type
== bfd_link_hash_common
)
4233 align
= bfd_log2 (isym
->st_value
);
4236 /* The new symbol is a common symbol in a shared object.
4237 We need to get the alignment from the section. */
4238 align
= new_sec
->alignment_power
;
4240 if (align
> old_alignment
4241 /* Permit an alignment power of zero if an alignment of one
4242 is specified and no other alignments have been specified. */
4243 || (isym
->st_value
== 1 && old_alignment
== 0))
4244 h
->root
.u
.c
.p
->alignment_power
= align
;
4246 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4249 if (is_elf_hash_table (htab
))
4253 /* Check the alignment when a common symbol is involved. This
4254 can change when a common symbol is overridden by a normal
4255 definition or a common symbol is ignored due to the old
4256 normal definition. We need to make sure the maximum
4257 alignment is maintained. */
4258 if ((old_alignment
|| common
)
4259 && h
->root
.type
!= bfd_link_hash_common
)
4261 unsigned int common_align
;
4262 unsigned int normal_align
;
4263 unsigned int symbol_align
;
4267 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4268 if (h
->root
.u
.def
.section
->owner
!= NULL
4269 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4271 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4272 if (normal_align
> symbol_align
)
4273 normal_align
= symbol_align
;
4276 normal_align
= symbol_align
;
4280 common_align
= old_alignment
;
4281 common_bfd
= old_bfd
;
4286 common_align
= bfd_log2 (isym
->st_value
);
4288 normal_bfd
= old_bfd
;
4291 if (normal_align
< common_align
)
4293 /* PR binutils/2735 */
4294 if (normal_bfd
== NULL
)
4295 (*_bfd_error_handler
)
4296 (_("Warning: alignment %u of common symbol `%s' in %B"
4297 " is greater than the alignment (%u) of its section %A"),
4298 common_bfd
, h
->root
.u
.def
.section
,
4299 1 << common_align
, name
, 1 << normal_align
);
4301 (*_bfd_error_handler
)
4302 (_("Warning: alignment %u of symbol `%s' in %B"
4303 " is smaller than %u in %B"),
4304 normal_bfd
, common_bfd
,
4305 1 << normal_align
, name
, 1 << common_align
);
4309 /* Remember the symbol size if it isn't undefined. */
4310 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4311 && (definition
|| h
->size
== 0))
4314 && h
->size
!= isym
->st_size
4315 && ! size_change_ok
)
4316 (*_bfd_error_handler
)
4317 (_("Warning: size of symbol `%s' changed"
4318 " from %lu in %B to %lu in %B"),
4320 name
, (unsigned long) h
->size
,
4321 (unsigned long) isym
->st_size
);
4323 h
->size
= isym
->st_size
;
4326 /* If this is a common symbol, then we always want H->SIZE
4327 to be the size of the common symbol. The code just above
4328 won't fix the size if a common symbol becomes larger. We
4329 don't warn about a size change here, because that is
4330 covered by --warn-common. Allow changed between different
4332 if (h
->root
.type
== bfd_link_hash_common
)
4333 h
->size
= h
->root
.u
.c
.size
;
4335 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4336 && (definition
|| 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 /* Set a flag in the hash table entry indicating the type of
4362 reference or definition we just found. Keep a count of
4363 the number of dynamic symbols we find. A dynamic symbol
4364 is one which is referenced or defined by both a regular
4365 object and a shared object. */
4372 if (bind
!= STB_WEAK
)
4373 h
->ref_regular_nonweak
= 1;
4385 if (! info
->executable
4398 || (h
->u
.weakdef
!= NULL
4400 && h
->u
.weakdef
->dynindx
!= -1))
4404 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4406 /* We don't want to make debug symbol dynamic. */
4411 h
->target_internal
= isym
->st_target_internal
;
4413 /* Check to see if we need to add an indirect symbol for
4414 the default name. */
4415 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4416 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4417 &sec
, &value
, &dynsym
,
4419 goto error_free_vers
;
4421 if (definition
&& !dynamic
)
4423 char *p
= strchr (name
, ELF_VER_CHR
);
4424 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4426 /* Queue non-default versions so that .symver x, x@FOO
4427 aliases can be checked. */
4430 amt
= ((isymend
- isym
+ 1)
4431 * sizeof (struct elf_link_hash_entry
*));
4433 (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4435 goto error_free_vers
;
4437 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4441 if (dynsym
&& h
->dynindx
== -1)
4443 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4444 goto error_free_vers
;
4445 if (h
->u
.weakdef
!= NULL
4447 && h
->u
.weakdef
->dynindx
== -1)
4449 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4450 goto error_free_vers
;
4453 else if (dynsym
&& h
->dynindx
!= -1)
4454 /* If the symbol already has a dynamic index, but
4455 visibility says it should not be visible, turn it into
4457 switch (ELF_ST_VISIBILITY (h
->other
))
4461 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4471 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4472 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4475 const char *soname
= elf_dt_name (abfd
);
4477 /* A symbol from a library loaded via DT_NEEDED of some
4478 other library is referenced by a regular object.
4479 Add a DT_NEEDED entry for it. Issue an error if
4480 --no-add-needed is used and the reference was not
4482 if (undef_bfd
!= NULL
4483 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4485 (*_bfd_error_handler
)
4486 (_("%B: undefined reference to symbol '%s'"),
4488 (*_bfd_error_handler
)
4489 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4491 bfd_set_error (bfd_error_invalid_operation
);
4492 goto error_free_vers
;
4495 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4496 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4499 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4501 goto error_free_vers
;
4503 BFD_ASSERT (ret
== 0);
4508 if (extversym
!= NULL
)
4514 if (isymbuf
!= NULL
)
4520 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4524 /* Restore the symbol table. */
4525 if (bed
->as_needed_cleanup
)
4526 (*bed
->as_needed_cleanup
) (abfd
, info
);
4527 old_hash
= (char *) old_tab
+ tabsize
;
4528 old_ent
= (char *) old_hash
+ hashsize
;
4529 sym_hash
= elf_sym_hashes (abfd
);
4530 htab
->root
.table
.table
= old_table
;
4531 htab
->root
.table
.size
= old_size
;
4532 htab
->root
.table
.count
= old_count
;
4533 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4534 memcpy (sym_hash
, old_hash
, hashsize
);
4535 htab
->root
.undefs
= old_undefs
;
4536 htab
->root
.undefs_tail
= old_undefs_tail
;
4537 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4539 struct bfd_hash_entry
*p
;
4540 struct elf_link_hash_entry
*h
;
4542 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4544 h
= (struct elf_link_hash_entry
*) p
;
4545 if (h
->root
.type
== bfd_link_hash_warning
)
4546 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4547 if (h
->dynindx
>= old_dynsymcount
)
4548 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4550 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4551 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4552 h
= (struct elf_link_hash_entry
*) p
;
4553 if (h
->root
.type
== bfd_link_hash_warning
)
4555 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4556 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4561 /* Make a special call to the linker "notice" function to
4562 tell it that symbols added for crefs may need to be removed. */
4563 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4565 goto error_free_vers
;
4568 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4570 if (nondeflt_vers
!= NULL
)
4571 free (nondeflt_vers
);
4575 if (old_tab
!= NULL
)
4577 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4579 goto error_free_vers
;
4584 /* Now that all the symbols from this input file are created, handle
4585 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4586 if (nondeflt_vers
!= NULL
)
4588 bfd_size_type cnt
, symidx
;
4590 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4592 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4593 char *shortname
, *p
;
4595 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4597 || (h
->root
.type
!= bfd_link_hash_defined
4598 && h
->root
.type
!= bfd_link_hash_defweak
))
4601 amt
= p
- h
->root
.root
.string
;
4602 shortname
= (char *) bfd_malloc (amt
+ 1);
4604 goto error_free_vers
;
4605 memcpy (shortname
, h
->root
.root
.string
, amt
);
4606 shortname
[amt
] = '\0';
4608 hi
= (struct elf_link_hash_entry
*)
4609 bfd_link_hash_lookup (&htab
->root
, shortname
,
4610 FALSE
, FALSE
, FALSE
);
4612 && hi
->root
.type
== h
->root
.type
4613 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4614 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4616 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4617 hi
->root
.type
= bfd_link_hash_indirect
;
4618 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4619 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4620 sym_hash
= elf_sym_hashes (abfd
);
4622 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4623 if (sym_hash
[symidx
] == hi
)
4625 sym_hash
[symidx
] = h
;
4631 free (nondeflt_vers
);
4632 nondeflt_vers
= NULL
;
4635 /* Now set the weakdefs field correctly for all the weak defined
4636 symbols we found. The only way to do this is to search all the
4637 symbols. Since we only need the information for non functions in
4638 dynamic objects, that's the only time we actually put anything on
4639 the list WEAKS. We need this information so that if a regular
4640 object refers to a symbol defined weakly in a dynamic object, the
4641 real symbol in the dynamic object is also put in the dynamic
4642 symbols; we also must arrange for both symbols to point to the
4643 same memory location. We could handle the general case of symbol
4644 aliasing, but a general symbol alias can only be generated in
4645 assembler code, handling it correctly would be very time
4646 consuming, and other ELF linkers don't handle general aliasing
4650 struct elf_link_hash_entry
**hpp
;
4651 struct elf_link_hash_entry
**hppend
;
4652 struct elf_link_hash_entry
**sorted_sym_hash
;
4653 struct elf_link_hash_entry
*h
;
4656 /* Since we have to search the whole symbol list for each weak
4657 defined symbol, search time for N weak defined symbols will be
4658 O(N^2). Binary search will cut it down to O(NlogN). */
4659 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4660 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4661 if (sorted_sym_hash
== NULL
)
4663 sym_hash
= sorted_sym_hash
;
4664 hpp
= elf_sym_hashes (abfd
);
4665 hppend
= hpp
+ extsymcount
;
4667 for (; hpp
< hppend
; hpp
++)
4671 && h
->root
.type
== bfd_link_hash_defined
4672 && !bed
->is_function_type (h
->type
))
4680 qsort (sorted_sym_hash
, sym_count
,
4681 sizeof (struct elf_link_hash_entry
*),
4684 while (weaks
!= NULL
)
4686 struct elf_link_hash_entry
*hlook
;
4693 weaks
= hlook
->u
.weakdef
;
4694 hlook
->u
.weakdef
= NULL
;
4696 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4697 || hlook
->root
.type
== bfd_link_hash_defweak
4698 || hlook
->root
.type
== bfd_link_hash_common
4699 || hlook
->root
.type
== bfd_link_hash_indirect
);
4700 slook
= hlook
->root
.u
.def
.section
;
4701 vlook
= hlook
->root
.u
.def
.value
;
4708 bfd_signed_vma vdiff
;
4710 h
= sorted_sym_hash
[idx
];
4711 vdiff
= vlook
- h
->root
.u
.def
.value
;
4718 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4731 /* We didn't find a value/section match. */
4735 for (i
= ilook
; i
< sym_count
; i
++)
4737 h
= sorted_sym_hash
[i
];
4739 /* Stop if value or section doesn't match. */
4740 if (h
->root
.u
.def
.value
!= vlook
4741 || h
->root
.u
.def
.section
!= slook
)
4743 else if (h
!= hlook
)
4745 hlook
->u
.weakdef
= h
;
4747 /* If the weak definition is in the list of dynamic
4748 symbols, make sure the real definition is put
4750 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4752 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4755 free (sorted_sym_hash
);
4760 /* If the real definition is in the list of dynamic
4761 symbols, make sure the weak definition is put
4762 there as well. If we don't do this, then the
4763 dynamic loader might not merge the entries for the
4764 real definition and the weak definition. */
4765 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4767 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4768 goto err_free_sym_hash
;
4775 free (sorted_sym_hash
);
4778 if (bed
->check_directives
4779 && !(*bed
->check_directives
) (abfd
, info
))
4782 /* If this object is the same format as the output object, and it is
4783 not a shared library, then let the backend look through the
4786 This is required to build global offset table entries and to
4787 arrange for dynamic relocs. It is not required for the
4788 particular common case of linking non PIC code, even when linking
4789 against shared libraries, but unfortunately there is no way of
4790 knowing whether an object file has been compiled PIC or not.
4791 Looking through the relocs is not particularly time consuming.
4792 The problem is that we must either (1) keep the relocs in memory,
4793 which causes the linker to require additional runtime memory or
4794 (2) read the relocs twice from the input file, which wastes time.
4795 This would be a good case for using mmap.
4797 I have no idea how to handle linking PIC code into a file of a
4798 different format. It probably can't be done. */
4800 && is_elf_hash_table (htab
)
4801 && bed
->check_relocs
!= NULL
4802 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4803 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4807 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4809 Elf_Internal_Rela
*internal_relocs
;
4812 if ((o
->flags
& SEC_RELOC
) == 0
4813 || o
->reloc_count
== 0
4814 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4815 && (o
->flags
& SEC_DEBUGGING
) != 0)
4816 || bfd_is_abs_section (o
->output_section
))
4819 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4821 if (internal_relocs
== NULL
)
4824 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4826 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4827 free (internal_relocs
);
4834 /* If this is a non-traditional link, try to optimize the handling
4835 of the .stab/.stabstr sections. */
4837 && ! info
->traditional_format
4838 && is_elf_hash_table (htab
)
4839 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4843 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4844 if (stabstr
!= NULL
)
4846 bfd_size_type string_offset
= 0;
4849 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4850 if (CONST_STRNEQ (stab
->name
, ".stab")
4851 && (!stab
->name
[5] ||
4852 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4853 && (stab
->flags
& SEC_MERGE
) == 0
4854 && !bfd_is_abs_section (stab
->output_section
))
4856 struct bfd_elf_section_data
*secdata
;
4858 secdata
= elf_section_data (stab
);
4859 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4860 stabstr
, &secdata
->sec_info
,
4863 if (secdata
->sec_info
)
4864 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4869 if (is_elf_hash_table (htab
) && add_needed
)
4871 /* Add this bfd to the loaded list. */
4872 struct elf_link_loaded_list
*n
;
4874 n
= (struct elf_link_loaded_list
*)
4875 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4879 n
->next
= htab
->loaded
;
4886 if (old_tab
!= NULL
)
4888 if (nondeflt_vers
!= NULL
)
4889 free (nondeflt_vers
);
4890 if (extversym
!= NULL
)
4893 if (isymbuf
!= NULL
)
4899 /* Return the linker hash table entry of a symbol that might be
4900 satisfied by an archive symbol. Return -1 on error. */
4902 struct elf_link_hash_entry
*
4903 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4904 struct bfd_link_info
*info
,
4907 struct elf_link_hash_entry
*h
;
4911 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4915 /* If this is a default version (the name contains @@), look up the
4916 symbol again with only one `@' as well as without the version.
4917 The effect is that references to the symbol with and without the
4918 version will be matched by the default symbol in the archive. */
4920 p
= strchr (name
, ELF_VER_CHR
);
4921 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4924 /* First check with only one `@'. */
4925 len
= strlen (name
);
4926 copy
= (char *) bfd_alloc (abfd
, len
);
4928 return (struct elf_link_hash_entry
*) 0 - 1;
4930 first
= p
- name
+ 1;
4931 memcpy (copy
, name
, first
);
4932 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4934 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4937 /* We also need to check references to the symbol without the
4939 copy
[first
- 1] = '\0';
4940 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4941 FALSE
, FALSE
, FALSE
);
4944 bfd_release (abfd
, copy
);
4948 /* Add symbols from an ELF archive file to the linker hash table. We
4949 don't use _bfd_generic_link_add_archive_symbols because of a
4950 problem which arises on UnixWare. The UnixWare libc.so is an
4951 archive which includes an entry libc.so.1 which defines a bunch of
4952 symbols. The libc.so archive also includes a number of other
4953 object files, which also define symbols, some of which are the same
4954 as those defined in libc.so.1. Correct linking requires that we
4955 consider each object file in turn, and include it if it defines any
4956 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4957 this; it looks through the list of undefined symbols, and includes
4958 any object file which defines them. When this algorithm is used on
4959 UnixWare, it winds up pulling in libc.so.1 early and defining a
4960 bunch of symbols. This means that some of the other objects in the
4961 archive are not included in the link, which is incorrect since they
4962 precede libc.so.1 in the archive.
4964 Fortunately, ELF archive handling is simpler than that done by
4965 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4966 oddities. In ELF, if we find a symbol in the archive map, and the
4967 symbol is currently undefined, we know that we must pull in that
4970 Unfortunately, we do have to make multiple passes over the symbol
4971 table until nothing further is resolved. */
4974 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4977 bfd_boolean
*defined
= NULL
;
4978 bfd_boolean
*included
= NULL
;
4982 const struct elf_backend_data
*bed
;
4983 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4984 (bfd
*, struct bfd_link_info
*, const char *);
4986 if (! bfd_has_map (abfd
))
4988 /* An empty archive is a special case. */
4989 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4991 bfd_set_error (bfd_error_no_armap
);
4995 /* Keep track of all symbols we know to be already defined, and all
4996 files we know to be already included. This is to speed up the
4997 second and subsequent passes. */
4998 c
= bfd_ardata (abfd
)->symdef_count
;
5002 amt
*= sizeof (bfd_boolean
);
5003 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
5004 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
5005 if (defined
== NULL
|| included
== NULL
)
5008 symdefs
= bfd_ardata (abfd
)->symdefs
;
5009 bed
= get_elf_backend_data (abfd
);
5010 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5023 symdefend
= symdef
+ c
;
5024 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5026 struct elf_link_hash_entry
*h
;
5028 struct bfd_link_hash_entry
*undefs_tail
;
5031 if (defined
[i
] || included
[i
])
5033 if (symdef
->file_offset
== last
)
5039 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5040 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5046 if (h
->root
.type
== bfd_link_hash_common
)
5048 /* We currently have a common symbol. The archive map contains
5049 a reference to this symbol, so we may want to include it. We
5050 only want to include it however, if this archive element
5051 contains a definition of the symbol, not just another common
5054 Unfortunately some archivers (including GNU ar) will put
5055 declarations of common symbols into their archive maps, as
5056 well as real definitions, so we cannot just go by the archive
5057 map alone. Instead we must read in the element's symbol
5058 table and check that to see what kind of symbol definition
5060 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5063 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5065 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5070 /* We need to include this archive member. */
5071 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5072 if (element
== NULL
)
5075 if (! bfd_check_format (element
, bfd_object
))
5078 /* Doublecheck that we have not included this object
5079 already--it should be impossible, but there may be
5080 something wrong with the archive. */
5081 if (element
->archive_pass
!= 0)
5083 bfd_set_error (bfd_error_bad_value
);
5086 element
->archive_pass
= 1;
5088 undefs_tail
= info
->hash
->undefs_tail
;
5090 if (!(*info
->callbacks
5091 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5093 if (!bfd_link_add_symbols (element
, info
))
5096 /* If there are any new undefined symbols, we need to make
5097 another pass through the archive in order to see whether
5098 they can be defined. FIXME: This isn't perfect, because
5099 common symbols wind up on undefs_tail and because an
5100 undefined symbol which is defined later on in this pass
5101 does not require another pass. This isn't a bug, but it
5102 does make the code less efficient than it could be. */
5103 if (undefs_tail
!= info
->hash
->undefs_tail
)
5106 /* Look backward to mark all symbols from this object file
5107 which we have already seen in this pass. */
5111 included
[mark
] = TRUE
;
5116 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5118 /* We mark subsequent symbols from this object file as we go
5119 on through the loop. */
5120 last
= symdef
->file_offset
;
5131 if (defined
!= NULL
)
5133 if (included
!= NULL
)
5138 /* Given an ELF BFD, add symbols to the global hash table as
5142 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5144 switch (bfd_get_format (abfd
))
5147 return elf_link_add_object_symbols (abfd
, info
);
5149 return elf_link_add_archive_symbols (abfd
, info
);
5151 bfd_set_error (bfd_error_wrong_format
);
5156 struct hash_codes_info
5158 unsigned long *hashcodes
;
5162 /* This function will be called though elf_link_hash_traverse to store
5163 all hash value of the exported symbols in an array. */
5166 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5168 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5174 if (h
->root
.type
== bfd_link_hash_warning
)
5175 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5177 /* Ignore indirect symbols. These are added by the versioning code. */
5178 if (h
->dynindx
== -1)
5181 name
= h
->root
.root
.string
;
5182 p
= strchr (name
, ELF_VER_CHR
);
5185 alc
= (char *) bfd_malloc (p
- name
+ 1);
5191 memcpy (alc
, name
, p
- name
);
5192 alc
[p
- name
] = '\0';
5196 /* Compute the hash value. */
5197 ha
= bfd_elf_hash (name
);
5199 /* Store the found hash value in the array given as the argument. */
5200 *(inf
->hashcodes
)++ = ha
;
5202 /* And store it in the struct so that we can put it in the hash table
5204 h
->u
.elf_hash_value
= ha
;
5212 struct collect_gnu_hash_codes
5215 const struct elf_backend_data
*bed
;
5216 unsigned long int nsyms
;
5217 unsigned long int maskbits
;
5218 unsigned long int *hashcodes
;
5219 unsigned long int *hashval
;
5220 unsigned long int *indx
;
5221 unsigned long int *counts
;
5224 long int min_dynindx
;
5225 unsigned long int bucketcount
;
5226 unsigned long int symindx
;
5227 long int local_indx
;
5228 long int shift1
, shift2
;
5229 unsigned long int mask
;
5233 /* This function will be called though elf_link_hash_traverse to store
5234 all hash value of the exported symbols in an array. */
5237 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5239 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5245 if (h
->root
.type
== bfd_link_hash_warning
)
5246 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5248 /* Ignore indirect symbols. These are added by the versioning code. */
5249 if (h
->dynindx
== -1)
5252 /* Ignore also local symbols and undefined symbols. */
5253 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5256 name
= h
->root
.root
.string
;
5257 p
= strchr (name
, ELF_VER_CHR
);
5260 alc
= (char *) bfd_malloc (p
- name
+ 1);
5266 memcpy (alc
, name
, p
- name
);
5267 alc
[p
- name
] = '\0';
5271 /* Compute the hash value. */
5272 ha
= bfd_elf_gnu_hash (name
);
5274 /* Store the found hash value in the array for compute_bucket_count,
5275 and also for .dynsym reordering purposes. */
5276 s
->hashcodes
[s
->nsyms
] = ha
;
5277 s
->hashval
[h
->dynindx
] = ha
;
5279 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5280 s
->min_dynindx
= h
->dynindx
;
5288 /* This function will be called though elf_link_hash_traverse to do
5289 final dynaminc symbol renumbering. */
5292 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5294 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5295 unsigned long int bucket
;
5296 unsigned long int val
;
5298 if (h
->root
.type
== bfd_link_hash_warning
)
5299 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5301 /* Ignore indirect symbols. */
5302 if (h
->dynindx
== -1)
5305 /* Ignore also local symbols and undefined symbols. */
5306 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5308 if (h
->dynindx
>= s
->min_dynindx
)
5309 h
->dynindx
= s
->local_indx
++;
5313 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5314 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5315 & ((s
->maskbits
>> s
->shift1
) - 1);
5316 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5318 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5319 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5320 if (s
->counts
[bucket
] == 1)
5321 /* Last element terminates the chain. */
5323 bfd_put_32 (s
->output_bfd
, val
,
5324 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5325 --s
->counts
[bucket
];
5326 h
->dynindx
= s
->indx
[bucket
]++;
5330 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5333 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5335 return !(h
->forced_local
5336 || h
->root
.type
== bfd_link_hash_undefined
5337 || h
->root
.type
== bfd_link_hash_undefweak
5338 || ((h
->root
.type
== bfd_link_hash_defined
5339 || h
->root
.type
== bfd_link_hash_defweak
)
5340 && h
->root
.u
.def
.section
->output_section
== NULL
));
5343 /* Array used to determine the number of hash table buckets to use
5344 based on the number of symbols there are. If there are fewer than
5345 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5346 fewer than 37 we use 17 buckets, and so forth. We never use more
5347 than 32771 buckets. */
5349 static const size_t elf_buckets
[] =
5351 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5355 /* Compute bucket count for hashing table. We do not use a static set
5356 of possible tables sizes anymore. Instead we determine for all
5357 possible reasonable sizes of the table the outcome (i.e., the
5358 number of collisions etc) and choose the best solution. The
5359 weighting functions are not too simple to allow the table to grow
5360 without bounds. Instead one of the weighting factors is the size.
5361 Therefore the result is always a good payoff between few collisions
5362 (= short chain lengths) and table size. */
5364 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5365 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5366 unsigned long int nsyms
,
5369 size_t best_size
= 0;
5370 unsigned long int i
;
5372 /* We have a problem here. The following code to optimize the table
5373 size requires an integer type with more the 32 bits. If
5374 BFD_HOST_U_64_BIT is set we know about such a type. */
5375 #ifdef BFD_HOST_U_64_BIT
5380 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5381 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5382 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5383 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5384 unsigned long int *counts
;
5386 unsigned int no_improvement_count
= 0;
5388 /* Possible optimization parameters: if we have NSYMS symbols we say
5389 that the hashing table must at least have NSYMS/4 and at most
5391 minsize
= nsyms
/ 4;
5394 best_size
= maxsize
= nsyms
* 2;
5399 if ((best_size
& 31) == 0)
5403 /* Create array where we count the collisions in. We must use bfd_malloc
5404 since the size could be large. */
5406 amt
*= sizeof (unsigned long int);
5407 counts
= (unsigned long int *) bfd_malloc (amt
);
5411 /* Compute the "optimal" size for the hash table. The criteria is a
5412 minimal chain length. The minor criteria is (of course) the size
5414 for (i
= minsize
; i
< maxsize
; ++i
)
5416 /* Walk through the array of hashcodes and count the collisions. */
5417 BFD_HOST_U_64_BIT max
;
5418 unsigned long int j
;
5419 unsigned long int fact
;
5421 if (gnu_hash
&& (i
& 31) == 0)
5424 memset (counts
, '\0', i
* sizeof (unsigned long int));
5426 /* Determine how often each hash bucket is used. */
5427 for (j
= 0; j
< nsyms
; ++j
)
5428 ++counts
[hashcodes
[j
] % i
];
5430 /* For the weight function we need some information about the
5431 pagesize on the target. This is information need not be 100%
5432 accurate. Since this information is not available (so far) we
5433 define it here to a reasonable default value. If it is crucial
5434 to have a better value some day simply define this value. */
5435 # ifndef BFD_TARGET_PAGESIZE
5436 # define BFD_TARGET_PAGESIZE (4096)
5439 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5441 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5444 /* Variant 1: optimize for short chains. We add the squares
5445 of all the chain lengths (which favors many small chain
5446 over a few long chains). */
5447 for (j
= 0; j
< i
; ++j
)
5448 max
+= counts
[j
] * counts
[j
];
5450 /* This adds penalties for the overall size of the table. */
5451 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5454 /* Variant 2: Optimize a lot more for small table. Here we
5455 also add squares of the size but we also add penalties for
5456 empty slots (the +1 term). */
5457 for (j
= 0; j
< i
; ++j
)
5458 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5460 /* The overall size of the table is considered, but not as
5461 strong as in variant 1, where it is squared. */
5462 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5466 /* Compare with current best results. */
5467 if (max
< best_chlen
)
5471 no_improvement_count
= 0;
5473 /* PR 11843: Avoid futile long searches for the best bucket size
5474 when there are a large number of symbols. */
5475 else if (++no_improvement_count
== 100)
5482 #endif /* defined (BFD_HOST_U_64_BIT) */
5484 /* This is the fallback solution if no 64bit type is available or if we
5485 are not supposed to spend much time on optimizations. We select the
5486 bucket count using a fixed set of numbers. */
5487 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5489 best_size
= elf_buckets
[i
];
5490 if (nsyms
< elf_buckets
[i
+ 1])
5493 if (gnu_hash
&& best_size
< 2)
5500 /* Size any SHT_GROUP section for ld -r. */
5503 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
5507 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
5508 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
5509 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
5514 /* Set up the sizes and contents of the ELF dynamic sections. This is
5515 called by the ELF linker emulation before_allocation routine. We
5516 must set the sizes of the sections before the linker sets the
5517 addresses of the various sections. */
5520 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5523 const char *filter_shlib
,
5525 const char *depaudit
,
5526 const char * const *auxiliary_filters
,
5527 struct bfd_link_info
*info
,
5528 asection
**sinterpptr
,
5529 struct bfd_elf_version_tree
*verdefs
)
5531 bfd_size_type soname_indx
;
5533 const struct elf_backend_data
*bed
;
5534 struct elf_info_failed asvinfo
;
5538 soname_indx
= (bfd_size_type
) -1;
5540 if (!is_elf_hash_table (info
->hash
))
5543 bed
= get_elf_backend_data (output_bfd
);
5544 if (info
->execstack
)
5545 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5546 else if (info
->noexecstack
)
5547 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5551 asection
*notesec
= NULL
;
5554 for (inputobj
= info
->input_bfds
;
5556 inputobj
= inputobj
->link_next
)
5560 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5562 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5565 if (s
->flags
& SEC_CODE
)
5569 else if (bed
->default_execstack
)
5574 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5575 if (exec
&& info
->relocatable
5576 && notesec
->output_section
!= bfd_abs_section_ptr
)
5577 notesec
->output_section
->flags
|= SEC_CODE
;
5581 /* Any syms created from now on start with -1 in
5582 got.refcount/offset and plt.refcount/offset. */
5583 elf_hash_table (info
)->init_got_refcount
5584 = elf_hash_table (info
)->init_got_offset
;
5585 elf_hash_table (info
)->init_plt_refcount
5586 = elf_hash_table (info
)->init_plt_offset
;
5588 if (info
->relocatable
5589 && !_bfd_elf_size_group_sections (info
))
5592 /* The backend may have to create some sections regardless of whether
5593 we're dynamic or not. */
5594 if (bed
->elf_backend_always_size_sections
5595 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5598 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5601 dynobj
= elf_hash_table (info
)->dynobj
;
5603 /* If there were no dynamic objects in the link, there is nothing to
5608 if (elf_hash_table (info
)->dynamic_sections_created
)
5610 struct elf_info_failed eif
;
5611 struct elf_link_hash_entry
*h
;
5613 struct bfd_elf_version_tree
*t
;
5614 struct bfd_elf_version_expr
*d
;
5616 bfd_boolean all_defined
;
5618 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5619 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5623 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5625 if (soname_indx
== (bfd_size_type
) -1
5626 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5632 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5634 info
->flags
|= DF_SYMBOLIC
;
5641 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5643 if (indx
== (bfd_size_type
) -1
5644 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5647 if (info
->new_dtags
)
5649 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5650 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5655 if (filter_shlib
!= NULL
)
5659 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5660 filter_shlib
, TRUE
);
5661 if (indx
== (bfd_size_type
) -1
5662 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5666 if (auxiliary_filters
!= NULL
)
5668 const char * const *p
;
5670 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5674 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5676 if (indx
== (bfd_size_type
) -1
5677 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5686 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
5688 if (indx
== (bfd_size_type
) -1
5689 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
5693 if (depaudit
!= NULL
)
5697 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
5699 if (indx
== (bfd_size_type
) -1
5700 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
5705 eif
.verdefs
= verdefs
;
5708 /* If we are supposed to export all symbols into the dynamic symbol
5709 table (this is not the normal case), then do so. */
5710 if (info
->export_dynamic
5711 || (info
->executable
&& info
->dynamic
))
5713 elf_link_hash_traverse (elf_hash_table (info
),
5714 _bfd_elf_export_symbol
,
5720 /* Make all global versions with definition. */
5721 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5722 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5723 if (!d
->symver
&& d
->literal
)
5725 const char *verstr
, *name
;
5726 size_t namelen
, verlen
, newlen
;
5727 char *newname
, *p
, leading_char
;
5728 struct elf_link_hash_entry
*newh
;
5730 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
5732 namelen
= strlen (name
) + (leading_char
!= '\0');
5734 verlen
= strlen (verstr
);
5735 newlen
= namelen
+ verlen
+ 3;
5737 newname
= (char *) bfd_malloc (newlen
);
5738 if (newname
== NULL
)
5740 newname
[0] = leading_char
;
5741 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
5743 /* Check the hidden versioned definition. */
5744 p
= newname
+ namelen
;
5746 memcpy (p
, verstr
, verlen
+ 1);
5747 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5748 newname
, FALSE
, FALSE
,
5751 || (newh
->root
.type
!= bfd_link_hash_defined
5752 && newh
->root
.type
!= bfd_link_hash_defweak
))
5754 /* Check the default versioned definition. */
5756 memcpy (p
, verstr
, verlen
+ 1);
5757 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5758 newname
, FALSE
, FALSE
,
5763 /* Mark this version if there is a definition and it is
5764 not defined in a shared object. */
5766 && !newh
->def_dynamic
5767 && (newh
->root
.type
== bfd_link_hash_defined
5768 || newh
->root
.type
== bfd_link_hash_defweak
))
5772 /* Attach all the symbols to their version information. */
5773 asvinfo
.info
= info
;
5774 asvinfo
.verdefs
= verdefs
;
5775 asvinfo
.failed
= FALSE
;
5777 elf_link_hash_traverse (elf_hash_table (info
),
5778 _bfd_elf_link_assign_sym_version
,
5783 if (!info
->allow_undefined_version
)
5785 /* Check if all global versions have a definition. */
5787 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5788 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5789 if (d
->literal
&& !d
->symver
&& !d
->script
)
5791 (*_bfd_error_handler
)
5792 (_("%s: undefined version: %s"),
5793 d
->pattern
, t
->name
);
5794 all_defined
= FALSE
;
5799 bfd_set_error (bfd_error_bad_value
);
5804 /* Find all symbols which were defined in a dynamic object and make
5805 the backend pick a reasonable value for them. */
5806 elf_link_hash_traverse (elf_hash_table (info
),
5807 _bfd_elf_adjust_dynamic_symbol
,
5812 /* Add some entries to the .dynamic section. We fill in some of the
5813 values later, in bfd_elf_final_link, but we must add the entries
5814 now so that we know the final size of the .dynamic section. */
5816 /* If there are initialization and/or finalization functions to
5817 call then add the corresponding DT_INIT/DT_FINI entries. */
5818 h
= (info
->init_function
5819 ? elf_link_hash_lookup (elf_hash_table (info
),
5820 info
->init_function
, FALSE
,
5827 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5830 h
= (info
->fini_function
5831 ? elf_link_hash_lookup (elf_hash_table (info
),
5832 info
->fini_function
, FALSE
,
5839 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5843 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5844 if (s
!= NULL
&& s
->linker_has_input
)
5846 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5847 if (! info
->executable
)
5852 for (sub
= info
->input_bfds
; sub
!= NULL
;
5853 sub
= sub
->link_next
)
5854 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5855 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5856 if (elf_section_data (o
)->this_hdr
.sh_type
5857 == SHT_PREINIT_ARRAY
)
5859 (*_bfd_error_handler
)
5860 (_("%B: .preinit_array section is not allowed in DSO"),
5865 bfd_set_error (bfd_error_nonrepresentable_section
);
5869 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5870 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5873 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5874 if (s
!= NULL
&& s
->linker_has_input
)
5876 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5877 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5880 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5881 if (s
!= NULL
&& s
->linker_has_input
)
5883 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5884 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5888 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5889 /* If .dynstr is excluded from the link, we don't want any of
5890 these tags. Strictly, we should be checking each section
5891 individually; This quick check covers for the case where
5892 someone does a /DISCARD/ : { *(*) }. */
5893 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5895 bfd_size_type strsize
;
5897 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5898 if ((info
->emit_hash
5899 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5900 || (info
->emit_gnu_hash
5901 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5902 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5903 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5904 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5905 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5906 bed
->s
->sizeof_sym
))
5911 /* The backend must work out the sizes of all the other dynamic
5913 if (bed
->elf_backend_size_dynamic_sections
5914 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5917 if (elf_hash_table (info
)->dynamic_sections_created
)
5919 unsigned long section_sym_count
;
5922 /* Set up the version definition section. */
5923 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5924 BFD_ASSERT (s
!= NULL
);
5926 /* We may have created additional version definitions if we are
5927 just linking a regular application. */
5928 verdefs
= asvinfo
.verdefs
;
5930 /* Skip anonymous version tag. */
5931 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5932 verdefs
= verdefs
->next
;
5934 if (verdefs
== NULL
&& !info
->create_default_symver
)
5935 s
->flags
|= SEC_EXCLUDE
;
5940 struct bfd_elf_version_tree
*t
;
5942 Elf_Internal_Verdef def
;
5943 Elf_Internal_Verdaux defaux
;
5944 struct bfd_link_hash_entry
*bh
;
5945 struct elf_link_hash_entry
*h
;
5951 /* Make space for the base version. */
5952 size
+= sizeof (Elf_External_Verdef
);
5953 size
+= sizeof (Elf_External_Verdaux
);
5956 /* Make space for the default version. */
5957 if (info
->create_default_symver
)
5959 size
+= sizeof (Elf_External_Verdef
);
5963 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5965 struct bfd_elf_version_deps
*n
;
5967 /* Don't emit base version twice. */
5971 size
+= sizeof (Elf_External_Verdef
);
5972 size
+= sizeof (Elf_External_Verdaux
);
5975 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5976 size
+= sizeof (Elf_External_Verdaux
);
5980 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
5981 if (s
->contents
== NULL
&& s
->size
!= 0)
5984 /* Fill in the version definition section. */
5988 def
.vd_version
= VER_DEF_CURRENT
;
5989 def
.vd_flags
= VER_FLG_BASE
;
5992 if (info
->create_default_symver
)
5994 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5995 def
.vd_next
= sizeof (Elf_External_Verdef
);
5999 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6000 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6001 + sizeof (Elf_External_Verdaux
));
6004 if (soname_indx
!= (bfd_size_type
) -1)
6006 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6008 def
.vd_hash
= bfd_elf_hash (soname
);
6009 defaux
.vda_name
= soname_indx
;
6016 name
= lbasename (output_bfd
->filename
);
6017 def
.vd_hash
= bfd_elf_hash (name
);
6018 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6020 if (indx
== (bfd_size_type
) -1)
6022 defaux
.vda_name
= indx
;
6024 defaux
.vda_next
= 0;
6026 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6027 (Elf_External_Verdef
*) p
);
6028 p
+= sizeof (Elf_External_Verdef
);
6029 if (info
->create_default_symver
)
6031 /* Add a symbol representing this version. */
6033 if (! (_bfd_generic_link_add_one_symbol
6034 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6036 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6038 h
= (struct elf_link_hash_entry
*) bh
;
6041 h
->type
= STT_OBJECT
;
6042 h
->verinfo
.vertree
= NULL
;
6044 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6047 /* Create a duplicate of the base version with the same
6048 aux block, but different flags. */
6051 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6053 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6054 + sizeof (Elf_External_Verdaux
));
6057 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6058 (Elf_External_Verdef
*) p
);
6059 p
+= sizeof (Elf_External_Verdef
);
6061 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6062 (Elf_External_Verdaux
*) p
);
6063 p
+= sizeof (Elf_External_Verdaux
);
6065 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6068 struct bfd_elf_version_deps
*n
;
6070 /* Don't emit the base version twice. */
6075 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6078 /* Add a symbol representing this version. */
6080 if (! (_bfd_generic_link_add_one_symbol
6081 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6083 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6085 h
= (struct elf_link_hash_entry
*) bh
;
6088 h
->type
= STT_OBJECT
;
6089 h
->verinfo
.vertree
= t
;
6091 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6094 def
.vd_version
= VER_DEF_CURRENT
;
6096 if (t
->globals
.list
== NULL
6097 && t
->locals
.list
== NULL
6099 def
.vd_flags
|= VER_FLG_WEAK
;
6100 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6101 def
.vd_cnt
= cdeps
+ 1;
6102 def
.vd_hash
= bfd_elf_hash (t
->name
);
6103 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6106 /* If a basever node is next, it *must* be the last node in
6107 the chain, otherwise Verdef construction breaks. */
6108 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6109 BFD_ASSERT (t
->next
->next
== NULL
);
6111 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6112 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6113 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6115 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6116 (Elf_External_Verdef
*) p
);
6117 p
+= sizeof (Elf_External_Verdef
);
6119 defaux
.vda_name
= h
->dynstr_index
;
6120 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6122 defaux
.vda_next
= 0;
6123 if (t
->deps
!= NULL
)
6124 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6125 t
->name_indx
= defaux
.vda_name
;
6127 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6128 (Elf_External_Verdaux
*) p
);
6129 p
+= sizeof (Elf_External_Verdaux
);
6131 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6133 if (n
->version_needed
== NULL
)
6135 /* This can happen if there was an error in the
6137 defaux
.vda_name
= 0;
6141 defaux
.vda_name
= n
->version_needed
->name_indx
;
6142 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6145 if (n
->next
== NULL
)
6146 defaux
.vda_next
= 0;
6148 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6150 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6151 (Elf_External_Verdaux
*) p
);
6152 p
+= sizeof (Elf_External_Verdaux
);
6156 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6157 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6160 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6163 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6165 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6168 else if (info
->flags
& DF_BIND_NOW
)
6170 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6176 if (info
->executable
)
6177 info
->flags_1
&= ~ (DF_1_INITFIRST
6180 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6184 /* Work out the size of the version reference section. */
6186 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6187 BFD_ASSERT (s
!= NULL
);
6189 struct elf_find_verdep_info sinfo
;
6192 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6193 if (sinfo
.vers
== 0)
6195 sinfo
.failed
= FALSE
;
6197 elf_link_hash_traverse (elf_hash_table (info
),
6198 _bfd_elf_link_find_version_dependencies
,
6203 if (elf_tdata (output_bfd
)->verref
== NULL
)
6204 s
->flags
|= SEC_EXCLUDE
;
6207 Elf_Internal_Verneed
*t
;
6212 /* Build the version dependency section. */
6215 for (t
= elf_tdata (output_bfd
)->verref
;
6219 Elf_Internal_Vernaux
*a
;
6221 size
+= sizeof (Elf_External_Verneed
);
6223 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6224 size
+= sizeof (Elf_External_Vernaux
);
6228 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6229 if (s
->contents
== NULL
)
6233 for (t
= elf_tdata (output_bfd
)->verref
;
6238 Elf_Internal_Vernaux
*a
;
6242 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6245 t
->vn_version
= VER_NEED_CURRENT
;
6247 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6248 elf_dt_name (t
->vn_bfd
) != NULL
6249 ? elf_dt_name (t
->vn_bfd
)
6250 : lbasename (t
->vn_bfd
->filename
),
6252 if (indx
== (bfd_size_type
) -1)
6255 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6256 if (t
->vn_nextref
== NULL
)
6259 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6260 + caux
* sizeof (Elf_External_Vernaux
));
6262 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6263 (Elf_External_Verneed
*) p
);
6264 p
+= sizeof (Elf_External_Verneed
);
6266 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6268 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6269 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6270 a
->vna_nodename
, FALSE
);
6271 if (indx
== (bfd_size_type
) -1)
6274 if (a
->vna_nextptr
== NULL
)
6277 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6279 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6280 (Elf_External_Vernaux
*) p
);
6281 p
+= sizeof (Elf_External_Vernaux
);
6285 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6286 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6289 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6293 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6294 && elf_tdata (output_bfd
)->cverdefs
== 0)
6295 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6296 §ion_sym_count
) == 0)
6298 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6299 s
->flags
|= SEC_EXCLUDE
;
6305 /* Find the first non-excluded output section. We'll use its
6306 section symbol for some emitted relocs. */
6308 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6312 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6313 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6314 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6316 elf_hash_table (info
)->text_index_section
= s
;
6321 /* Find two non-excluded output sections, one for code, one for data.
6322 We'll use their section symbols for some emitted relocs. */
6324 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6328 /* Data first, since setting text_index_section changes
6329 _bfd_elf_link_omit_section_dynsym. */
6330 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6331 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6332 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6334 elf_hash_table (info
)->data_index_section
= s
;
6338 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6339 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6340 == (SEC_ALLOC
| SEC_READONLY
))
6341 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6343 elf_hash_table (info
)->text_index_section
= s
;
6347 if (elf_hash_table (info
)->text_index_section
== NULL
)
6348 elf_hash_table (info
)->text_index_section
6349 = elf_hash_table (info
)->data_index_section
;
6353 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6355 const struct elf_backend_data
*bed
;
6357 if (!is_elf_hash_table (info
->hash
))
6360 bed
= get_elf_backend_data (output_bfd
);
6361 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6363 if (elf_hash_table (info
)->dynamic_sections_created
)
6367 bfd_size_type dynsymcount
;
6368 unsigned long section_sym_count
;
6369 unsigned int dtagcount
;
6371 dynobj
= elf_hash_table (info
)->dynobj
;
6373 /* Assign dynsym indicies. In a shared library we generate a
6374 section symbol for each output section, which come first.
6375 Next come all of the back-end allocated local dynamic syms,
6376 followed by the rest of the global symbols. */
6378 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6379 §ion_sym_count
);
6381 /* Work out the size of the symbol version section. */
6382 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6383 BFD_ASSERT (s
!= NULL
);
6384 if (dynsymcount
!= 0
6385 && (s
->flags
& SEC_EXCLUDE
) == 0)
6387 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6388 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6389 if (s
->contents
== NULL
)
6392 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6396 /* Set the size of the .dynsym and .hash sections. We counted
6397 the number of dynamic symbols in elf_link_add_object_symbols.
6398 We will build the contents of .dynsym and .hash when we build
6399 the final symbol table, because until then we do not know the
6400 correct value to give the symbols. We built the .dynstr
6401 section as we went along in elf_link_add_object_symbols. */
6402 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6403 BFD_ASSERT (s
!= NULL
);
6404 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6406 if (dynsymcount
!= 0)
6408 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6409 if (s
->contents
== NULL
)
6412 /* The first entry in .dynsym is a dummy symbol.
6413 Clear all the section syms, in case we don't output them all. */
6414 ++section_sym_count
;
6415 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6418 elf_hash_table (info
)->bucketcount
= 0;
6420 /* Compute the size of the hashing table. As a side effect this
6421 computes the hash values for all the names we export. */
6422 if (info
->emit_hash
)
6424 unsigned long int *hashcodes
;
6425 struct hash_codes_info hashinf
;
6427 unsigned long int nsyms
;
6429 size_t hash_entry_size
;
6431 /* Compute the hash values for all exported symbols. At the same
6432 time store the values in an array so that we could use them for
6434 amt
= dynsymcount
* sizeof (unsigned long int);
6435 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6436 if (hashcodes
== NULL
)
6438 hashinf
.hashcodes
= hashcodes
;
6439 hashinf
.error
= FALSE
;
6441 /* Put all hash values in HASHCODES. */
6442 elf_link_hash_traverse (elf_hash_table (info
),
6443 elf_collect_hash_codes
, &hashinf
);
6450 nsyms
= hashinf
.hashcodes
- hashcodes
;
6452 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6455 if (bucketcount
== 0)
6458 elf_hash_table (info
)->bucketcount
= bucketcount
;
6460 s
= bfd_get_section_by_name (dynobj
, ".hash");
6461 BFD_ASSERT (s
!= NULL
);
6462 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6463 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6464 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6465 if (s
->contents
== NULL
)
6468 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6469 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6470 s
->contents
+ hash_entry_size
);
6473 if (info
->emit_gnu_hash
)
6476 unsigned char *contents
;
6477 struct collect_gnu_hash_codes cinfo
;
6481 memset (&cinfo
, 0, sizeof (cinfo
));
6483 /* Compute the hash values for all exported symbols. At the same
6484 time store the values in an array so that we could use them for
6486 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6487 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6488 if (cinfo
.hashcodes
== NULL
)
6491 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6492 cinfo
.min_dynindx
= -1;
6493 cinfo
.output_bfd
= output_bfd
;
6496 /* Put all hash values in HASHCODES. */
6497 elf_link_hash_traverse (elf_hash_table (info
),
6498 elf_collect_gnu_hash_codes
, &cinfo
);
6501 free (cinfo
.hashcodes
);
6506 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6508 if (bucketcount
== 0)
6510 free (cinfo
.hashcodes
);
6514 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6515 BFD_ASSERT (s
!= NULL
);
6517 if (cinfo
.nsyms
== 0)
6519 /* Empty .gnu.hash section is special. */
6520 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6521 free (cinfo
.hashcodes
);
6522 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6523 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6524 if (contents
== NULL
)
6526 s
->contents
= contents
;
6527 /* 1 empty bucket. */
6528 bfd_put_32 (output_bfd
, 1, contents
);
6529 /* SYMIDX above the special symbol 0. */
6530 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6531 /* Just one word for bitmask. */
6532 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6533 /* Only hash fn bloom filter. */
6534 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6535 /* No hashes are valid - empty bitmask. */
6536 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6537 /* No hashes in the only bucket. */
6538 bfd_put_32 (output_bfd
, 0,
6539 contents
+ 16 + bed
->s
->arch_size
/ 8);
6543 unsigned long int maskwords
, maskbitslog2
;
6544 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6546 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6547 if (maskbitslog2
< 3)
6549 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6550 maskbitslog2
= maskbitslog2
+ 3;
6552 maskbitslog2
= maskbitslog2
+ 2;
6553 if (bed
->s
->arch_size
== 64)
6555 if (maskbitslog2
== 5)
6561 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6562 cinfo
.shift2
= maskbitslog2
;
6563 cinfo
.maskbits
= 1 << maskbitslog2
;
6564 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6565 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6566 amt
+= maskwords
* sizeof (bfd_vma
);
6567 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6568 if (cinfo
.bitmask
== NULL
)
6570 free (cinfo
.hashcodes
);
6574 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6575 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6576 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6577 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6579 /* Determine how often each hash bucket is used. */
6580 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6581 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6582 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6584 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6585 if (cinfo
.counts
[i
] != 0)
6587 cinfo
.indx
[i
] = cnt
;
6588 cnt
+= cinfo
.counts
[i
];
6590 BFD_ASSERT (cnt
== dynsymcount
);
6591 cinfo
.bucketcount
= bucketcount
;
6592 cinfo
.local_indx
= cinfo
.min_dynindx
;
6594 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6595 s
->size
+= cinfo
.maskbits
/ 8;
6596 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6597 if (contents
== NULL
)
6599 free (cinfo
.bitmask
);
6600 free (cinfo
.hashcodes
);
6604 s
->contents
= contents
;
6605 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6606 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6607 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6608 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6609 contents
+= 16 + cinfo
.maskbits
/ 8;
6611 for (i
= 0; i
< bucketcount
; ++i
)
6613 if (cinfo
.counts
[i
] == 0)
6614 bfd_put_32 (output_bfd
, 0, contents
);
6616 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6620 cinfo
.contents
= contents
;
6622 /* Renumber dynamic symbols, populate .gnu.hash section. */
6623 elf_link_hash_traverse (elf_hash_table (info
),
6624 elf_renumber_gnu_hash_syms
, &cinfo
);
6626 contents
= s
->contents
+ 16;
6627 for (i
= 0; i
< maskwords
; ++i
)
6629 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6631 contents
+= bed
->s
->arch_size
/ 8;
6634 free (cinfo
.bitmask
);
6635 free (cinfo
.hashcodes
);
6639 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6640 BFD_ASSERT (s
!= NULL
);
6642 elf_finalize_dynstr (output_bfd
, info
);
6644 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6646 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6647 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6654 /* Indicate that we are only retrieving symbol values from this
6658 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6660 if (is_elf_hash_table (info
->hash
))
6661 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6662 _bfd_generic_link_just_syms (sec
, info
);
6665 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6668 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6671 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6672 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6675 /* Finish SHF_MERGE section merging. */
6678 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6683 if (!is_elf_hash_table (info
->hash
))
6686 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6687 if ((ibfd
->flags
& DYNAMIC
) == 0)
6688 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6689 if ((sec
->flags
& SEC_MERGE
) != 0
6690 && !bfd_is_abs_section (sec
->output_section
))
6692 struct bfd_elf_section_data
*secdata
;
6694 secdata
= elf_section_data (sec
);
6695 if (! _bfd_add_merge_section (abfd
,
6696 &elf_hash_table (info
)->merge_info
,
6697 sec
, &secdata
->sec_info
))
6699 else if (secdata
->sec_info
)
6700 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6703 if (elf_hash_table (info
)->merge_info
!= NULL
)
6704 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6705 merge_sections_remove_hook
);
6709 /* Create an entry in an ELF linker hash table. */
6711 struct bfd_hash_entry
*
6712 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6713 struct bfd_hash_table
*table
,
6716 /* Allocate the structure if it has not already been allocated by a
6720 entry
= (struct bfd_hash_entry
*)
6721 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6726 /* Call the allocation method of the superclass. */
6727 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6730 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6731 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6733 /* Set local fields. */
6736 ret
->got
= htab
->init_got_refcount
;
6737 ret
->plt
= htab
->init_plt_refcount
;
6738 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6739 - offsetof (struct elf_link_hash_entry
, size
)));
6740 /* Assume that we have been called by a non-ELF symbol reader.
6741 This flag is then reset by the code which reads an ELF input
6742 file. This ensures that a symbol created by a non-ELF symbol
6743 reader will have the flag set correctly. */
6750 /* Copy data from an indirect symbol to its direct symbol, hiding the
6751 old indirect symbol. Also used for copying flags to a weakdef. */
6754 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6755 struct elf_link_hash_entry
*dir
,
6756 struct elf_link_hash_entry
*ind
)
6758 struct elf_link_hash_table
*htab
;
6760 /* Copy down any references that we may have already seen to the
6761 symbol which just became indirect. */
6763 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6764 dir
->ref_regular
|= ind
->ref_regular
;
6765 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6766 dir
->non_got_ref
|= ind
->non_got_ref
;
6767 dir
->needs_plt
|= ind
->needs_plt
;
6768 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6770 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6773 /* Copy over the global and procedure linkage table refcount entries.
6774 These may have been already set up by a check_relocs routine. */
6775 htab
= elf_hash_table (info
);
6776 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6778 if (dir
->got
.refcount
< 0)
6779 dir
->got
.refcount
= 0;
6780 dir
->got
.refcount
+= ind
->got
.refcount
;
6781 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6784 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6786 if (dir
->plt
.refcount
< 0)
6787 dir
->plt
.refcount
= 0;
6788 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6789 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6792 if (ind
->dynindx
!= -1)
6794 if (dir
->dynindx
!= -1)
6795 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6796 dir
->dynindx
= ind
->dynindx
;
6797 dir
->dynstr_index
= ind
->dynstr_index
;
6799 ind
->dynstr_index
= 0;
6804 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6805 struct elf_link_hash_entry
*h
,
6806 bfd_boolean force_local
)
6808 /* STT_GNU_IFUNC symbol must go through PLT. */
6809 if (h
->type
!= STT_GNU_IFUNC
)
6811 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6816 h
->forced_local
= 1;
6817 if (h
->dynindx
!= -1)
6820 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6826 /* Initialize an ELF linker hash table. */
6829 _bfd_elf_link_hash_table_init
6830 (struct elf_link_hash_table
*table
,
6832 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6833 struct bfd_hash_table
*,
6835 unsigned int entsize
,
6836 enum elf_target_id target_id
)
6839 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6841 memset (table
, 0, sizeof * table
);
6842 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6843 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6844 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6845 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6846 /* The first dynamic symbol is a dummy. */
6847 table
->dynsymcount
= 1;
6849 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6851 table
->root
.type
= bfd_link_elf_hash_table
;
6852 table
->hash_table_id
= target_id
;
6857 /* Create an ELF linker hash table. */
6859 struct bfd_link_hash_table
*
6860 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6862 struct elf_link_hash_table
*ret
;
6863 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6865 ret
= (struct elf_link_hash_table
*) bfd_malloc (amt
);
6869 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6870 sizeof (struct elf_link_hash_entry
),
6880 /* This is a hook for the ELF emulation code in the generic linker to
6881 tell the backend linker what file name to use for the DT_NEEDED
6882 entry for a dynamic object. */
6885 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6887 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6888 && bfd_get_format (abfd
) == bfd_object
)
6889 elf_dt_name (abfd
) = name
;
6893 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6896 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6897 && bfd_get_format (abfd
) == bfd_object
)
6898 lib_class
= elf_dyn_lib_class (abfd
);
6905 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6907 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6908 && bfd_get_format (abfd
) == bfd_object
)
6909 elf_dyn_lib_class (abfd
) = lib_class
;
6912 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6913 the linker ELF emulation code. */
6915 struct bfd_link_needed_list
*
6916 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6917 struct bfd_link_info
*info
)
6919 if (! is_elf_hash_table (info
->hash
))
6921 return elf_hash_table (info
)->needed
;
6924 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6925 hook for the linker ELF emulation code. */
6927 struct bfd_link_needed_list
*
6928 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6929 struct bfd_link_info
*info
)
6931 if (! is_elf_hash_table (info
->hash
))
6933 return elf_hash_table (info
)->runpath
;
6936 /* Get the name actually used for a dynamic object for a link. This
6937 is the SONAME entry if there is one. Otherwise, it is the string
6938 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6941 bfd_elf_get_dt_soname (bfd
*abfd
)
6943 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6944 && bfd_get_format (abfd
) == bfd_object
)
6945 return elf_dt_name (abfd
);
6949 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6950 the ELF linker emulation code. */
6953 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6954 struct bfd_link_needed_list
**pneeded
)
6957 bfd_byte
*dynbuf
= NULL
;
6958 unsigned int elfsec
;
6959 unsigned long shlink
;
6960 bfd_byte
*extdyn
, *extdynend
;
6962 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6966 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6967 || bfd_get_format (abfd
) != bfd_object
)
6970 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6971 if (s
== NULL
|| s
->size
== 0)
6974 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6977 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6978 if (elfsec
== SHN_BAD
)
6981 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6983 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6984 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6987 extdynend
= extdyn
+ s
->size
;
6988 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6990 Elf_Internal_Dyn dyn
;
6992 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6994 if (dyn
.d_tag
== DT_NULL
)
6997 if (dyn
.d_tag
== DT_NEEDED
)
7000 struct bfd_link_needed_list
*l
;
7001 unsigned int tagv
= dyn
.d_un
.d_val
;
7004 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7009 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7030 struct elf_symbuf_symbol
7032 unsigned long st_name
; /* Symbol name, index in string tbl */
7033 unsigned char st_info
; /* Type and binding attributes */
7034 unsigned char st_other
; /* Visibilty, and target specific */
7037 struct elf_symbuf_head
7039 struct elf_symbuf_symbol
*ssym
;
7040 bfd_size_type count
;
7041 unsigned int st_shndx
;
7048 Elf_Internal_Sym
*isym
;
7049 struct elf_symbuf_symbol
*ssym
;
7054 /* Sort references to symbols by ascending section number. */
7057 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7059 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7060 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7062 return s1
->st_shndx
- s2
->st_shndx
;
7066 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7068 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7069 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7070 return strcmp (s1
->name
, s2
->name
);
7073 static struct elf_symbuf_head
*
7074 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
7076 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7077 struct elf_symbuf_symbol
*ssym
;
7078 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7079 bfd_size_type i
, shndx_count
, total_size
;
7081 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7085 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7086 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7087 *ind
++ = &isymbuf
[i
];
7090 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7091 elf_sort_elf_symbol
);
7094 if (indbufend
> indbuf
)
7095 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7096 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7099 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7100 + (indbufend
- indbuf
) * sizeof (*ssym
));
7101 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7102 if (ssymbuf
== NULL
)
7108 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7109 ssymbuf
->ssym
= NULL
;
7110 ssymbuf
->count
= shndx_count
;
7111 ssymbuf
->st_shndx
= 0;
7112 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7114 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7117 ssymhead
->ssym
= ssym
;
7118 ssymhead
->count
= 0;
7119 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7121 ssym
->st_name
= (*ind
)->st_name
;
7122 ssym
->st_info
= (*ind
)->st_info
;
7123 ssym
->st_other
= (*ind
)->st_other
;
7126 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7127 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7134 /* Check if 2 sections define the same set of local and global
7138 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7139 struct bfd_link_info
*info
)
7142 const struct elf_backend_data
*bed1
, *bed2
;
7143 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7144 bfd_size_type symcount1
, symcount2
;
7145 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7146 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7147 Elf_Internal_Sym
*isym
, *isymend
;
7148 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7149 bfd_size_type count1
, count2
, i
;
7150 unsigned int shndx1
, shndx2
;
7156 /* Both sections have to be in ELF. */
7157 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7158 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7161 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7164 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7165 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7166 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7169 bed1
= get_elf_backend_data (bfd1
);
7170 bed2
= get_elf_backend_data (bfd2
);
7171 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7172 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7173 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7174 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7176 if (symcount1
== 0 || symcount2
== 0)
7182 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7183 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7185 if (ssymbuf1
== NULL
)
7187 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7189 if (isymbuf1
== NULL
)
7192 if (!info
->reduce_memory_overheads
)
7193 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7194 = elf_create_symbuf (symcount1
, isymbuf1
);
7197 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7199 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7201 if (isymbuf2
== NULL
)
7204 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7205 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7206 = elf_create_symbuf (symcount2
, isymbuf2
);
7209 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7211 /* Optimized faster version. */
7212 bfd_size_type lo
, hi
, mid
;
7213 struct elf_symbol
*symp
;
7214 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7217 hi
= ssymbuf1
->count
;
7222 mid
= (lo
+ hi
) / 2;
7223 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7225 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7229 count1
= ssymbuf1
[mid
].count
;
7236 hi
= ssymbuf2
->count
;
7241 mid
= (lo
+ hi
) / 2;
7242 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7244 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7248 count2
= ssymbuf2
[mid
].count
;
7254 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7257 symtable1
= (struct elf_symbol
*)
7258 bfd_malloc (count1
* sizeof (struct elf_symbol
));
7259 symtable2
= (struct elf_symbol
*)
7260 bfd_malloc (count2
* sizeof (struct elf_symbol
));
7261 if (symtable1
== NULL
|| symtable2
== NULL
)
7265 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7266 ssym
< ssymend
; ssym
++, symp
++)
7268 symp
->u
.ssym
= ssym
;
7269 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7275 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7276 ssym
< ssymend
; ssym
++, symp
++)
7278 symp
->u
.ssym
= ssym
;
7279 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7284 /* Sort symbol by name. */
7285 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7286 elf_sym_name_compare
);
7287 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7288 elf_sym_name_compare
);
7290 for (i
= 0; i
< count1
; i
++)
7291 /* Two symbols must have the same binding, type and name. */
7292 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7293 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7294 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7301 symtable1
= (struct elf_symbol
*)
7302 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7303 symtable2
= (struct elf_symbol
*)
7304 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7305 if (symtable1
== NULL
|| symtable2
== NULL
)
7308 /* Count definitions in the section. */
7310 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7311 if (isym
->st_shndx
== shndx1
)
7312 symtable1
[count1
++].u
.isym
= isym
;
7315 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7316 if (isym
->st_shndx
== shndx2
)
7317 symtable2
[count2
++].u
.isym
= isym
;
7319 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7322 for (i
= 0; i
< count1
; i
++)
7324 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7325 symtable1
[i
].u
.isym
->st_name
);
7327 for (i
= 0; i
< count2
; i
++)
7329 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7330 symtable2
[i
].u
.isym
->st_name
);
7332 /* Sort symbol by name. */
7333 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7334 elf_sym_name_compare
);
7335 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7336 elf_sym_name_compare
);
7338 for (i
= 0; i
< count1
; i
++)
7339 /* Two symbols must have the same binding, type and name. */
7340 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7341 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7342 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7360 /* Return TRUE if 2 section types are compatible. */
7363 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7364 bfd
*bbfd
, const asection
*bsec
)
7368 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7369 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7372 return elf_section_type (asec
) == elf_section_type (bsec
);
7375 /* Final phase of ELF linker. */
7377 /* A structure we use to avoid passing large numbers of arguments. */
7379 struct elf_final_link_info
7381 /* General link information. */
7382 struct bfd_link_info
*info
;
7385 /* Symbol string table. */
7386 struct bfd_strtab_hash
*symstrtab
;
7387 /* .dynsym section. */
7388 asection
*dynsym_sec
;
7389 /* .hash section. */
7391 /* symbol version section (.gnu.version). */
7392 asection
*symver_sec
;
7393 /* Buffer large enough to hold contents of any section. */
7395 /* Buffer large enough to hold external relocs of any section. */
7396 void *external_relocs
;
7397 /* Buffer large enough to hold internal relocs of any section. */
7398 Elf_Internal_Rela
*internal_relocs
;
7399 /* Buffer large enough to hold external local symbols of any input
7401 bfd_byte
*external_syms
;
7402 /* And a buffer for symbol section indices. */
7403 Elf_External_Sym_Shndx
*locsym_shndx
;
7404 /* Buffer large enough to hold internal local symbols of any input
7406 Elf_Internal_Sym
*internal_syms
;
7407 /* Array large enough to hold a symbol index for each local symbol
7408 of any input BFD. */
7410 /* Array large enough to hold a section pointer for each local
7411 symbol of any input BFD. */
7412 asection
**sections
;
7413 /* Buffer to hold swapped out symbols. */
7415 /* And one for symbol section indices. */
7416 Elf_External_Sym_Shndx
*symshndxbuf
;
7417 /* Number of swapped out symbols in buffer. */
7418 size_t symbuf_count
;
7419 /* Number of symbols which fit in symbuf. */
7421 /* And same for symshndxbuf. */
7422 size_t shndxbuf_size
;
7425 /* This struct is used to pass information to elf_link_output_extsym. */
7427 struct elf_outext_info
7430 bfd_boolean localsyms
;
7431 struct elf_final_link_info
*finfo
;
7435 /* Support for evaluating a complex relocation.
7437 Complex relocations are generalized, self-describing relocations. The
7438 implementation of them consists of two parts: complex symbols, and the
7439 relocations themselves.
7441 The relocations are use a reserved elf-wide relocation type code (R_RELC
7442 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7443 information (start bit, end bit, word width, etc) into the addend. This
7444 information is extracted from CGEN-generated operand tables within gas.
7446 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7447 internal) representing prefix-notation expressions, including but not
7448 limited to those sorts of expressions normally encoded as addends in the
7449 addend field. The symbol mangling format is:
7452 | <unary-operator> ':' <node>
7453 | <binary-operator> ':' <node> ':' <node>
7456 <literal> := 's' <digits=N> ':' <N character symbol name>
7457 | 'S' <digits=N> ':' <N character section name>
7461 <binary-operator> := as in C
7462 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7465 set_symbol_value (bfd
*bfd_with_globals
,
7466 Elf_Internal_Sym
*isymbuf
,
7471 struct elf_link_hash_entry
**sym_hashes
;
7472 struct elf_link_hash_entry
*h
;
7473 size_t extsymoff
= locsymcount
;
7475 if (symidx
< locsymcount
)
7477 Elf_Internal_Sym
*sym
;
7479 sym
= isymbuf
+ symidx
;
7480 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7482 /* It is a local symbol: move it to the
7483 "absolute" section and give it a value. */
7484 sym
->st_shndx
= SHN_ABS
;
7485 sym
->st_value
= val
;
7488 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7492 /* It is a global symbol: set its link type
7493 to "defined" and give it a value. */
7495 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7496 h
= sym_hashes
[symidx
- extsymoff
];
7497 while (h
->root
.type
== bfd_link_hash_indirect
7498 || h
->root
.type
== bfd_link_hash_warning
)
7499 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7500 h
->root
.type
= bfd_link_hash_defined
;
7501 h
->root
.u
.def
.value
= val
;
7502 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7506 resolve_symbol (const char *name
,
7508 struct elf_final_link_info
*finfo
,
7510 Elf_Internal_Sym
*isymbuf
,
7513 Elf_Internal_Sym
*sym
;
7514 struct bfd_link_hash_entry
*global_entry
;
7515 const char *candidate
= NULL
;
7516 Elf_Internal_Shdr
*symtab_hdr
;
7519 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7521 for (i
= 0; i
< locsymcount
; ++ i
)
7525 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7528 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7529 symtab_hdr
->sh_link
,
7532 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7533 name
, candidate
, (unsigned long) sym
->st_value
);
7535 if (candidate
&& strcmp (candidate
, name
) == 0)
7537 asection
*sec
= finfo
->sections
[i
];
7539 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7540 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7542 printf ("Found symbol with value %8.8lx\n",
7543 (unsigned long) *result
);
7549 /* Hmm, haven't found it yet. perhaps it is a global. */
7550 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7551 FALSE
, FALSE
, TRUE
);
7555 if (global_entry
->type
== bfd_link_hash_defined
7556 || global_entry
->type
== bfd_link_hash_defweak
)
7558 *result
= (global_entry
->u
.def
.value
7559 + global_entry
->u
.def
.section
->output_section
->vma
7560 + global_entry
->u
.def
.section
->output_offset
);
7562 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7563 global_entry
->root
.string
, (unsigned long) *result
);
7572 resolve_section (const char *name
,
7579 for (curr
= sections
; curr
; curr
= curr
->next
)
7580 if (strcmp (curr
->name
, name
) == 0)
7582 *result
= curr
->vma
;
7586 /* Hmm. still haven't found it. try pseudo-section names. */
7587 for (curr
= sections
; curr
; curr
= curr
->next
)
7589 len
= strlen (curr
->name
);
7590 if (len
> strlen (name
))
7593 if (strncmp (curr
->name
, name
, len
) == 0)
7595 if (strncmp (".end", name
+ len
, 4) == 0)
7597 *result
= curr
->vma
+ curr
->size
;
7601 /* Insert more pseudo-section names here, if you like. */
7609 undefined_reference (const char *reftype
, const char *name
)
7611 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7616 eval_symbol (bfd_vma
*result
,
7619 struct elf_final_link_info
*finfo
,
7621 Elf_Internal_Sym
*isymbuf
,
7630 const char *sym
= *symp
;
7632 bfd_boolean symbol_is_section
= FALSE
;
7637 if (len
< 1 || len
> sizeof (symbuf
))
7639 bfd_set_error (bfd_error_invalid_operation
);
7652 *result
= strtoul (sym
, (char **) symp
, 16);
7656 symbol_is_section
= TRUE
;
7659 symlen
= strtol (sym
, (char **) symp
, 10);
7660 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7662 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7664 bfd_set_error (bfd_error_invalid_operation
);
7668 memcpy (symbuf
, sym
, symlen
);
7669 symbuf
[symlen
] = '\0';
7670 *symp
= sym
+ symlen
;
7672 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7673 the symbol as a section, or vice-versa. so we're pretty liberal in our
7674 interpretation here; section means "try section first", not "must be a
7675 section", and likewise with symbol. */
7677 if (symbol_is_section
)
7679 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7680 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7681 isymbuf
, locsymcount
))
7683 undefined_reference ("section", symbuf
);
7689 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7690 isymbuf
, locsymcount
)
7691 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7694 undefined_reference ("symbol", symbuf
);
7701 /* All that remains are operators. */
7703 #define UNARY_OP(op) \
7704 if (strncmp (sym, #op, strlen (#op)) == 0) \
7706 sym += strlen (#op); \
7710 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7711 isymbuf, locsymcount, signed_p)) \
7714 *result = op ((bfd_signed_vma) a); \
7720 #define BINARY_OP(op) \
7721 if (strncmp (sym, #op, strlen (#op)) == 0) \
7723 sym += strlen (#op); \
7727 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7728 isymbuf, locsymcount, signed_p)) \
7731 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7732 isymbuf, locsymcount, signed_p)) \
7735 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7765 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7766 bfd_set_error (bfd_error_invalid_operation
);
7772 put_value (bfd_vma size
,
7773 unsigned long chunksz
,
7778 location
+= (size
- chunksz
);
7780 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7788 bfd_put_8 (input_bfd
, x
, location
);
7791 bfd_put_16 (input_bfd
, x
, location
);
7794 bfd_put_32 (input_bfd
, x
, location
);
7798 bfd_put_64 (input_bfd
, x
, location
);
7808 get_value (bfd_vma size
,
7809 unsigned long chunksz
,
7815 for (; size
; size
-= chunksz
, location
+= chunksz
)
7823 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7826 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7829 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7833 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7844 decode_complex_addend (unsigned long *start
, /* in bits */
7845 unsigned long *oplen
, /* in bits */
7846 unsigned long *len
, /* in bits */
7847 unsigned long *wordsz
, /* in bytes */
7848 unsigned long *chunksz
, /* in bytes */
7849 unsigned long *lsb0_p
,
7850 unsigned long *signed_p
,
7851 unsigned long *trunc_p
,
7852 unsigned long encoded
)
7854 * start
= encoded
& 0x3F;
7855 * len
= (encoded
>> 6) & 0x3F;
7856 * oplen
= (encoded
>> 12) & 0x3F;
7857 * wordsz
= (encoded
>> 18) & 0xF;
7858 * chunksz
= (encoded
>> 22) & 0xF;
7859 * lsb0_p
= (encoded
>> 27) & 1;
7860 * signed_p
= (encoded
>> 28) & 1;
7861 * trunc_p
= (encoded
>> 29) & 1;
7864 bfd_reloc_status_type
7865 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7866 asection
*input_section ATTRIBUTE_UNUSED
,
7868 Elf_Internal_Rela
*rel
,
7871 bfd_vma shift
, x
, mask
;
7872 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7873 bfd_reloc_status_type r
;
7875 /* Perform this reloc, since it is complex.
7876 (this is not to say that it necessarily refers to a complex
7877 symbol; merely that it is a self-describing CGEN based reloc.
7878 i.e. the addend has the complete reloc information (bit start, end,
7879 word size, etc) encoded within it.). */
7881 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7882 &chunksz
, &lsb0_p
, &signed_p
,
7883 &trunc_p
, rel
->r_addend
);
7885 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7888 shift
= (start
+ 1) - len
;
7890 shift
= (8 * wordsz
) - (start
+ len
);
7892 /* FIXME: octets_per_byte. */
7893 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7896 printf ("Doing complex reloc: "
7897 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7898 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7899 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7900 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7901 oplen
, (unsigned long) x
, (unsigned long) mask
,
7902 (unsigned long) relocation
);
7907 /* Now do an overflow check. */
7908 r
= bfd_check_overflow ((signed_p
7909 ? complain_overflow_signed
7910 : complain_overflow_unsigned
),
7911 len
, 0, (8 * wordsz
),
7915 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7918 printf (" relocation: %8.8lx\n"
7919 " shifted mask: %8.8lx\n"
7920 " shifted/masked reloc: %8.8lx\n"
7921 " result: %8.8lx\n",
7922 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
7923 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
7925 /* FIXME: octets_per_byte. */
7926 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7930 /* When performing a relocatable link, the input relocations are
7931 preserved. But, if they reference global symbols, the indices
7932 referenced must be updated. Update all the relocations found in
7936 elf_link_adjust_relocs (bfd
*abfd
,
7937 struct bfd_elf_section_reloc_data
*reldata
)
7940 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7942 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7943 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7944 bfd_vma r_type_mask
;
7946 unsigned int count
= reldata
->count
;
7947 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
7949 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7951 swap_in
= bed
->s
->swap_reloc_in
;
7952 swap_out
= bed
->s
->swap_reloc_out
;
7954 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7956 swap_in
= bed
->s
->swap_reloca_in
;
7957 swap_out
= bed
->s
->swap_reloca_out
;
7962 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7965 if (bed
->s
->arch_size
== 32)
7972 r_type_mask
= 0xffffffff;
7976 erela
= reldata
->hdr
->contents
;
7977 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
7979 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7982 if (*rel_hash
== NULL
)
7985 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7987 (*swap_in
) (abfd
, erela
, irela
);
7988 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7989 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7990 | (irela
[j
].r_info
& r_type_mask
));
7991 (*swap_out
) (abfd
, irela
, erela
);
7995 struct elf_link_sort_rela
8001 enum elf_reloc_type_class type
;
8002 /* We use this as an array of size int_rels_per_ext_rel. */
8003 Elf_Internal_Rela rela
[1];
8007 elf_link_sort_cmp1 (const void *A
, const void *B
)
8009 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8010 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8011 int relativea
, relativeb
;
8013 relativea
= a
->type
== reloc_class_relative
;
8014 relativeb
= b
->type
== reloc_class_relative
;
8016 if (relativea
< relativeb
)
8018 if (relativea
> relativeb
)
8020 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
8022 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
8024 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8026 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8032 elf_link_sort_cmp2 (const void *A
, const void *B
)
8034 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8035 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8038 if (a
->u
.offset
< b
->u
.offset
)
8040 if (a
->u
.offset
> b
->u
.offset
)
8042 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
8043 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
8048 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8050 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8056 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8058 asection
*dynamic_relocs
;
8061 bfd_size_type count
, size
;
8062 size_t i
, ret
, sort_elt
, ext_size
;
8063 bfd_byte
*sort
, *s_non_relative
, *p
;
8064 struct elf_link_sort_rela
*sq
;
8065 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8066 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8067 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8068 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8069 struct bfd_link_order
*lo
;
8071 bfd_boolean use_rela
;
8073 /* Find a dynamic reloc section. */
8074 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8075 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8076 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8077 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8079 bfd_boolean use_rela_initialised
= FALSE
;
8081 /* This is just here to stop gcc from complaining.
8082 It's initialization checking code is not perfect. */
8085 /* Both sections are present. Examine the sizes
8086 of the indirect sections to help us choose. */
8087 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8088 if (lo
->type
== bfd_indirect_link_order
)
8090 asection
*o
= lo
->u
.indirect
.section
;
8092 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8094 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8095 /* Section size is divisible by both rel and rela sizes.
8096 It is of no help to us. */
8100 /* Section size is only divisible by rela. */
8101 if (use_rela_initialised
&& (use_rela
== FALSE
))
8104 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8105 bfd_set_error (bfd_error_invalid_operation
);
8111 use_rela_initialised
= TRUE
;
8115 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8117 /* Section size is only divisible by rel. */
8118 if (use_rela_initialised
&& (use_rela
== TRUE
))
8121 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8122 bfd_set_error (bfd_error_invalid_operation
);
8128 use_rela_initialised
= TRUE
;
8133 /* The section size is not divisible by either - something is wrong. */
8135 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8136 bfd_set_error (bfd_error_invalid_operation
);
8141 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8142 if (lo
->type
== bfd_indirect_link_order
)
8144 asection
*o
= lo
->u
.indirect
.section
;
8146 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8148 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8149 /* Section size is divisible by both rel and rela sizes.
8150 It is of no help to us. */
8154 /* Section size is only divisible by rela. */
8155 if (use_rela_initialised
&& (use_rela
== FALSE
))
8158 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8159 bfd_set_error (bfd_error_invalid_operation
);
8165 use_rela_initialised
= TRUE
;
8169 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8171 /* Section size is only divisible by rel. */
8172 if (use_rela_initialised
&& (use_rela
== TRUE
))
8175 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8176 bfd_set_error (bfd_error_invalid_operation
);
8182 use_rela_initialised
= TRUE
;
8187 /* The section size is not divisible by either - something is wrong. */
8189 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8190 bfd_set_error (bfd_error_invalid_operation
);
8195 if (! use_rela_initialised
)
8199 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8201 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8208 dynamic_relocs
= rela_dyn
;
8209 ext_size
= bed
->s
->sizeof_rela
;
8210 swap_in
= bed
->s
->swap_reloca_in
;
8211 swap_out
= bed
->s
->swap_reloca_out
;
8215 dynamic_relocs
= rel_dyn
;
8216 ext_size
= bed
->s
->sizeof_rel
;
8217 swap_in
= bed
->s
->swap_reloc_in
;
8218 swap_out
= bed
->s
->swap_reloc_out
;
8222 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8223 if (lo
->type
== bfd_indirect_link_order
)
8224 size
+= lo
->u
.indirect
.section
->size
;
8226 if (size
!= dynamic_relocs
->size
)
8229 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8230 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8232 count
= dynamic_relocs
->size
/ ext_size
;
8235 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8239 (*info
->callbacks
->warning
)
8240 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8244 if (bed
->s
->arch_size
== 32)
8245 r_sym_mask
= ~(bfd_vma
) 0xff;
8247 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8249 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8250 if (lo
->type
== bfd_indirect_link_order
)
8252 bfd_byte
*erel
, *erelend
;
8253 asection
*o
= lo
->u
.indirect
.section
;
8255 if (o
->contents
== NULL
&& o
->size
!= 0)
8257 /* This is a reloc section that is being handled as a normal
8258 section. See bfd_section_from_shdr. We can't combine
8259 relocs in this case. */
8264 erelend
= o
->contents
+ o
->size
;
8265 /* FIXME: octets_per_byte. */
8266 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8268 while (erel
< erelend
)
8270 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8272 (*swap_in
) (abfd
, erel
, s
->rela
);
8273 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8274 s
->u
.sym_mask
= r_sym_mask
;
8280 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8282 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8284 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8285 if (s
->type
!= reloc_class_relative
)
8291 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8292 for (; i
< count
; i
++, p
+= sort_elt
)
8294 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8295 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8297 sp
->u
.offset
= sq
->rela
->r_offset
;
8300 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8302 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8303 if (lo
->type
== bfd_indirect_link_order
)
8305 bfd_byte
*erel
, *erelend
;
8306 asection
*o
= lo
->u
.indirect
.section
;
8309 erelend
= o
->contents
+ o
->size
;
8310 /* FIXME: octets_per_byte. */
8311 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8312 while (erel
< erelend
)
8314 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8315 (*swap_out
) (abfd
, s
->rela
, erel
);
8322 *psec
= dynamic_relocs
;
8326 /* Flush the output symbols to the file. */
8329 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8330 const struct elf_backend_data
*bed
)
8332 if (finfo
->symbuf_count
> 0)
8334 Elf_Internal_Shdr
*hdr
;
8338 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8339 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8340 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8341 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8342 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8345 hdr
->sh_size
+= amt
;
8346 finfo
->symbuf_count
= 0;
8352 /* Add a symbol to the output symbol table. */
8355 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8357 Elf_Internal_Sym
*elfsym
,
8358 asection
*input_sec
,
8359 struct elf_link_hash_entry
*h
)
8362 Elf_External_Sym_Shndx
*destshndx
;
8363 int (*output_symbol_hook
)
8364 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8365 struct elf_link_hash_entry
*);
8366 const struct elf_backend_data
*bed
;
8368 bed
= get_elf_backend_data (finfo
->output_bfd
);
8369 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8370 if (output_symbol_hook
!= NULL
)
8372 int ret
= (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
);
8377 if (name
== NULL
|| *name
== '\0')
8378 elfsym
->st_name
= 0;
8379 else if (input_sec
->flags
& SEC_EXCLUDE
)
8380 elfsym
->st_name
= 0;
8383 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8385 if (elfsym
->st_name
== (unsigned long) -1)
8389 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8391 if (! elf_link_flush_output_syms (finfo
, bed
))
8395 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8396 destshndx
= finfo
->symshndxbuf
;
8397 if (destshndx
!= NULL
)
8399 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8403 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8404 destshndx
= (Elf_External_Sym_Shndx
*) bfd_realloc (destshndx
,
8406 if (destshndx
== NULL
)
8408 finfo
->symshndxbuf
= destshndx
;
8409 memset ((char *) destshndx
+ amt
, 0, amt
);
8410 finfo
->shndxbuf_size
*= 2;
8412 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8415 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8416 finfo
->symbuf_count
+= 1;
8417 bfd_get_symcount (finfo
->output_bfd
) += 1;
8422 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8425 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8427 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8428 && sym
->st_shndx
< SHN_LORESERVE
)
8430 /* The gABI doesn't support dynamic symbols in output sections
8432 (*_bfd_error_handler
)
8433 (_("%B: Too many sections: %d (>= %d)"),
8434 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8435 bfd_set_error (bfd_error_nonrepresentable_section
);
8441 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8442 allowing an unsatisfied unversioned symbol in the DSO to match a
8443 versioned symbol that would normally require an explicit version.
8444 We also handle the case that a DSO references a hidden symbol
8445 which may be satisfied by a versioned symbol in another DSO. */
8448 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8449 const struct elf_backend_data
*bed
,
8450 struct elf_link_hash_entry
*h
)
8453 struct elf_link_loaded_list
*loaded
;
8455 if (!is_elf_hash_table (info
->hash
))
8458 switch (h
->root
.type
)
8464 case bfd_link_hash_undefined
:
8465 case bfd_link_hash_undefweak
:
8466 abfd
= h
->root
.u
.undef
.abfd
;
8467 if ((abfd
->flags
& DYNAMIC
) == 0
8468 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8472 case bfd_link_hash_defined
:
8473 case bfd_link_hash_defweak
:
8474 abfd
= h
->root
.u
.def
.section
->owner
;
8477 case bfd_link_hash_common
:
8478 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8481 BFD_ASSERT (abfd
!= NULL
);
8483 for (loaded
= elf_hash_table (info
)->loaded
;
8485 loaded
= loaded
->next
)
8488 Elf_Internal_Shdr
*hdr
;
8489 bfd_size_type symcount
;
8490 bfd_size_type extsymcount
;
8491 bfd_size_type extsymoff
;
8492 Elf_Internal_Shdr
*versymhdr
;
8493 Elf_Internal_Sym
*isym
;
8494 Elf_Internal_Sym
*isymend
;
8495 Elf_Internal_Sym
*isymbuf
;
8496 Elf_External_Versym
*ever
;
8497 Elf_External_Versym
*extversym
;
8499 input
= loaded
->abfd
;
8501 /* We check each DSO for a possible hidden versioned definition. */
8503 || (input
->flags
& DYNAMIC
) == 0
8504 || elf_dynversym (input
) == 0)
8507 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8509 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8510 if (elf_bad_symtab (input
))
8512 extsymcount
= symcount
;
8517 extsymcount
= symcount
- hdr
->sh_info
;
8518 extsymoff
= hdr
->sh_info
;
8521 if (extsymcount
== 0)
8524 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8526 if (isymbuf
== NULL
)
8529 /* Read in any version definitions. */
8530 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8531 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
8532 if (extversym
== NULL
)
8535 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8536 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8537 != versymhdr
->sh_size
))
8545 ever
= extversym
+ extsymoff
;
8546 isymend
= isymbuf
+ extsymcount
;
8547 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8550 Elf_Internal_Versym iver
;
8551 unsigned short version_index
;
8553 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8554 || isym
->st_shndx
== SHN_UNDEF
)
8557 name
= bfd_elf_string_from_elf_section (input
,
8560 if (strcmp (name
, h
->root
.root
.string
) != 0)
8563 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8565 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
8567 && h
->forced_local
))
8569 /* If we have a non-hidden versioned sym, then it should
8570 have provided a definition for the undefined sym unless
8571 it is defined in a non-shared object and forced local.
8576 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8577 if (version_index
== 1 || version_index
== 2)
8579 /* This is the base or first version. We can use it. */
8593 /* Add an external symbol to the symbol table. This is called from
8594 the hash table traversal routine. When generating a shared object,
8595 we go through the symbol table twice. The first time we output
8596 anything that might have been forced to local scope in a version
8597 script. The second time we output the symbols that are still
8601 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8603 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
8604 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8606 Elf_Internal_Sym sym
;
8607 asection
*input_sec
;
8608 const struct elf_backend_data
*bed
;
8612 if (h
->root
.type
== bfd_link_hash_warning
)
8614 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8615 if (h
->root
.type
== bfd_link_hash_new
)
8619 /* Decide whether to output this symbol in this pass. */
8620 if (eoinfo
->localsyms
)
8622 if (!h
->forced_local
)
8627 if (h
->forced_local
)
8631 bed
= get_elf_backend_data (finfo
->output_bfd
);
8633 if (h
->root
.type
== bfd_link_hash_undefined
)
8635 /* If we have an undefined symbol reference here then it must have
8636 come from a shared library that is being linked in. (Undefined
8637 references in regular files have already been handled unless
8638 they are in unreferenced sections which are removed by garbage
8640 bfd_boolean ignore_undef
= FALSE
;
8642 /* Some symbols may be special in that the fact that they're
8643 undefined can be safely ignored - let backend determine that. */
8644 if (bed
->elf_backend_ignore_undef_symbol
)
8645 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8647 /* If we are reporting errors for this situation then do so now. */
8650 && (!h
->ref_regular
|| finfo
->info
->gc_sections
)
8651 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8652 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8654 if (! (finfo
->info
->callbacks
->undefined_symbol
8655 (finfo
->info
, h
->root
.root
.string
,
8656 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
8657 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8659 bfd_set_error (bfd_error_bad_value
);
8660 eoinfo
->failed
= TRUE
;
8666 /* We should also warn if a forced local symbol is referenced from
8667 shared libraries. */
8668 if (! finfo
->info
->relocatable
8669 && (! finfo
->info
->shared
)
8674 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8679 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
8680 msg
= _("%B: internal symbol `%s' in %B is referenced by DSO");
8681 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
8682 msg
= _("%B: hidden symbol `%s' in %B is referenced by DSO");
8684 msg
= _("%B: local symbol `%s' in %B is referenced by DSO");
8685 def_bfd
= finfo
->output_bfd
;
8686 if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
8687 def_bfd
= h
->root
.u
.def
.section
->owner
;
8688 (*_bfd_error_handler
) (msg
, finfo
->output_bfd
, def_bfd
,
8689 h
->root
.root
.string
);
8690 bfd_set_error (bfd_error_bad_value
);
8691 eoinfo
->failed
= TRUE
;
8695 /* We don't want to output symbols that have never been mentioned by
8696 a regular file, or that we have been told to strip. However, if
8697 h->indx is set to -2, the symbol is used by a reloc and we must
8701 else if ((h
->def_dynamic
8703 || h
->root
.type
== bfd_link_hash_new
)
8707 else if (finfo
->info
->strip
== strip_all
)
8709 else if (finfo
->info
->strip
== strip_some
8710 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8711 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8713 else if (finfo
->info
->strip_discarded
8714 && (h
->root
.type
== bfd_link_hash_defined
8715 || h
->root
.type
== bfd_link_hash_defweak
)
8716 && elf_discarded_section (h
->root
.u
.def
.section
))
8718 else if ((h
->root
.type
== bfd_link_hash_undefined
8719 || h
->root
.type
== bfd_link_hash_undefweak
)
8720 && h
->root
.u
.undef
.abfd
!= NULL
8721 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
8726 /* If we're stripping it, and it's not a dynamic symbol, there's
8727 nothing else to do unless it is a forced local symbol or a
8728 STT_GNU_IFUNC symbol. */
8731 && h
->type
!= STT_GNU_IFUNC
8732 && !h
->forced_local
)
8736 sym
.st_size
= h
->size
;
8737 sym
.st_other
= h
->other
;
8738 if (h
->forced_local
)
8740 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8741 /* Turn off visibility on local symbol. */
8742 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
8744 else if (h
->unique_global
)
8745 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, h
->type
);
8746 else if (h
->root
.type
== bfd_link_hash_undefweak
8747 || h
->root
.type
== bfd_link_hash_defweak
)
8748 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8750 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8751 sym
.st_target_internal
= h
->target_internal
;
8753 switch (h
->root
.type
)
8756 case bfd_link_hash_new
:
8757 case bfd_link_hash_warning
:
8761 case bfd_link_hash_undefined
:
8762 case bfd_link_hash_undefweak
:
8763 input_sec
= bfd_und_section_ptr
;
8764 sym
.st_shndx
= SHN_UNDEF
;
8767 case bfd_link_hash_defined
:
8768 case bfd_link_hash_defweak
:
8770 input_sec
= h
->root
.u
.def
.section
;
8771 if (input_sec
->output_section
!= NULL
)
8774 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8775 input_sec
->output_section
);
8776 if (sym
.st_shndx
== SHN_BAD
)
8778 (*_bfd_error_handler
)
8779 (_("%B: could not find output section %A for input section %A"),
8780 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8781 bfd_set_error (bfd_error_nonrepresentable_section
);
8782 eoinfo
->failed
= TRUE
;
8786 /* ELF symbols in relocatable files are section relative,
8787 but in nonrelocatable files they are virtual
8789 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8790 if (! finfo
->info
->relocatable
)
8792 sym
.st_value
+= input_sec
->output_section
->vma
;
8793 if (h
->type
== STT_TLS
)
8795 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8796 if (tls_sec
!= NULL
)
8797 sym
.st_value
-= tls_sec
->vma
;
8800 /* The TLS section may have been garbage collected. */
8801 BFD_ASSERT (finfo
->info
->gc_sections
8802 && !input_sec
->gc_mark
);
8809 BFD_ASSERT (input_sec
->owner
== NULL
8810 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8811 sym
.st_shndx
= SHN_UNDEF
;
8812 input_sec
= bfd_und_section_ptr
;
8817 case bfd_link_hash_common
:
8818 input_sec
= h
->root
.u
.c
.p
->section
;
8819 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8820 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8823 case bfd_link_hash_indirect
:
8824 /* These symbols are created by symbol versioning. They point
8825 to the decorated version of the name. For example, if the
8826 symbol foo@@GNU_1.2 is the default, which should be used when
8827 foo is used with no version, then we add an indirect symbol
8828 foo which points to foo@@GNU_1.2. We ignore these symbols,
8829 since the indirected symbol is already in the hash table. */
8833 /* Give the processor backend a chance to tweak the symbol value,
8834 and also to finish up anything that needs to be done for this
8835 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8836 forced local syms when non-shared is due to a historical quirk.
8837 STT_GNU_IFUNC symbol must go through PLT. */
8838 if ((h
->type
== STT_GNU_IFUNC
8840 && !finfo
->info
->relocatable
)
8841 || ((h
->dynindx
!= -1
8843 && ((finfo
->info
->shared
8844 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8845 || h
->root
.type
!= bfd_link_hash_undefweak
))
8846 || !h
->forced_local
)
8847 && elf_hash_table (finfo
->info
)->dynamic_sections_created
))
8849 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8850 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8852 eoinfo
->failed
= TRUE
;
8857 /* If we are marking the symbol as undefined, and there are no
8858 non-weak references to this symbol from a regular object, then
8859 mark the symbol as weak undefined; if there are non-weak
8860 references, mark the symbol as strong. We can't do this earlier,
8861 because it might not be marked as undefined until the
8862 finish_dynamic_symbol routine gets through with it. */
8863 if (sym
.st_shndx
== SHN_UNDEF
8865 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8866 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8869 unsigned int type
= ELF_ST_TYPE (sym
.st_info
);
8871 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8872 if (type
== STT_GNU_IFUNC
)
8875 if (h
->ref_regular_nonweak
)
8876 bindtype
= STB_GLOBAL
;
8878 bindtype
= STB_WEAK
;
8879 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
8882 /* If this is a symbol defined in a dynamic library, don't use the
8883 symbol size from the dynamic library. Relinking an executable
8884 against a new library may introduce gratuitous changes in the
8885 executable's symbols if we keep the size. */
8886 if (sym
.st_shndx
== SHN_UNDEF
8891 /* If a non-weak symbol with non-default visibility is not defined
8892 locally, it is a fatal error. */
8893 if (! finfo
->info
->relocatable
8894 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8895 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8896 && h
->root
.type
== bfd_link_hash_undefined
8901 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
8902 msg
= _("%B: protected symbol `%s' isn't defined");
8903 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
8904 msg
= _("%B: internal symbol `%s' isn't defined");
8906 msg
= _("%B: hidden symbol `%s' isn't defined");
8907 (*_bfd_error_handler
) (msg
, finfo
->output_bfd
, h
->root
.root
.string
);
8908 bfd_set_error (bfd_error_bad_value
);
8909 eoinfo
->failed
= TRUE
;
8913 /* If this symbol should be put in the .dynsym section, then put it
8914 there now. We already know the symbol index. We also fill in
8915 the entry in the .hash section. */
8916 if (h
->dynindx
!= -1
8917 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8921 sym
.st_name
= h
->dynstr_index
;
8922 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8923 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8925 eoinfo
->failed
= TRUE
;
8928 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8930 if (finfo
->hash_sec
!= NULL
)
8932 size_t hash_entry_size
;
8933 bfd_byte
*bucketpos
;
8938 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8939 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8942 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8943 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8944 + (bucket
+ 2) * hash_entry_size
);
8945 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8946 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8947 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8948 ((bfd_byte
*) finfo
->hash_sec
->contents
8949 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8952 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8954 Elf_Internal_Versym iversym
;
8955 Elf_External_Versym
*eversym
;
8957 if (!h
->def_regular
)
8959 if (h
->verinfo
.verdef
== NULL
)
8960 iversym
.vs_vers
= 0;
8962 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8966 if (h
->verinfo
.vertree
== NULL
)
8967 iversym
.vs_vers
= 1;
8969 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8970 if (finfo
->info
->create_default_symver
)
8975 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8977 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8978 eversym
+= h
->dynindx
;
8979 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8983 /* If we're stripping it, then it was just a dynamic symbol, and
8984 there's nothing else to do. */
8985 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8988 indx
= bfd_get_symcount (finfo
->output_bfd
);
8989 ret
= elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
8992 eoinfo
->failed
= TRUE
;
8997 else if (h
->indx
== -2)
9003 /* Return TRUE if special handling is done for relocs in SEC against
9004 symbols defined in discarded sections. */
9007 elf_section_ignore_discarded_relocs (asection
*sec
)
9009 const struct elf_backend_data
*bed
;
9011 switch (sec
->sec_info_type
)
9013 case ELF_INFO_TYPE_STABS
:
9014 case ELF_INFO_TYPE_EH_FRAME
:
9020 bed
= get_elf_backend_data (sec
->owner
);
9021 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
9022 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
9028 /* Return a mask saying how ld should treat relocations in SEC against
9029 symbols defined in discarded sections. If this function returns
9030 COMPLAIN set, ld will issue a warning message. If this function
9031 returns PRETEND set, and the discarded section was link-once and the
9032 same size as the kept link-once section, ld will pretend that the
9033 symbol was actually defined in the kept section. Otherwise ld will
9034 zero the reloc (at least that is the intent, but some cooperation by
9035 the target dependent code is needed, particularly for REL targets). */
9038 _bfd_elf_default_action_discarded (asection
*sec
)
9040 if (sec
->flags
& SEC_DEBUGGING
)
9043 if (strcmp (".eh_frame", sec
->name
) == 0)
9046 if (strcmp (".gcc_except_table", sec
->name
) == 0)
9049 return COMPLAIN
| PRETEND
;
9052 /* Find a match between a section and a member of a section group. */
9055 match_group_member (asection
*sec
, asection
*group
,
9056 struct bfd_link_info
*info
)
9058 asection
*first
= elf_next_in_group (group
);
9059 asection
*s
= first
;
9063 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
9066 s
= elf_next_in_group (s
);
9074 /* Check if the kept section of a discarded section SEC can be used
9075 to replace it. Return the replacement if it is OK. Otherwise return
9079 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9083 kept
= sec
->kept_section
;
9086 if ((kept
->flags
& SEC_GROUP
) != 0)
9087 kept
= match_group_member (sec
, kept
, info
);
9089 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9090 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9092 sec
->kept_section
= kept
;
9097 /* Link an input file into the linker output file. This function
9098 handles all the sections and relocations of the input file at once.
9099 This is so that we only have to read the local symbols once, and
9100 don't have to keep them in memory. */
9103 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
9105 int (*relocate_section
)
9106 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9107 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9109 Elf_Internal_Shdr
*symtab_hdr
;
9112 Elf_Internal_Sym
*isymbuf
;
9113 Elf_Internal_Sym
*isym
;
9114 Elf_Internal_Sym
*isymend
;
9116 asection
**ppsection
;
9118 const struct elf_backend_data
*bed
;
9119 struct elf_link_hash_entry
**sym_hashes
;
9121 output_bfd
= finfo
->output_bfd
;
9122 bed
= get_elf_backend_data (output_bfd
);
9123 relocate_section
= bed
->elf_backend_relocate_section
;
9125 /* If this is a dynamic object, we don't want to do anything here:
9126 we don't want the local symbols, and we don't want the section
9128 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9131 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9132 if (elf_bad_symtab (input_bfd
))
9134 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9139 locsymcount
= symtab_hdr
->sh_info
;
9140 extsymoff
= symtab_hdr
->sh_info
;
9143 /* Read the local symbols. */
9144 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9145 if (isymbuf
== NULL
&& locsymcount
!= 0)
9147 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9148 finfo
->internal_syms
,
9149 finfo
->external_syms
,
9150 finfo
->locsym_shndx
);
9151 if (isymbuf
== NULL
)
9155 /* Find local symbol sections and adjust values of symbols in
9156 SEC_MERGE sections. Write out those local symbols we know are
9157 going into the output file. */
9158 isymend
= isymbuf
+ locsymcount
;
9159 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
9161 isym
++, pindex
++, ppsection
++)
9165 Elf_Internal_Sym osym
;
9171 if (elf_bad_symtab (input_bfd
))
9173 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9180 if (isym
->st_shndx
== SHN_UNDEF
)
9181 isec
= bfd_und_section_ptr
;
9182 else if (isym
->st_shndx
== SHN_ABS
)
9183 isec
= bfd_abs_section_ptr
;
9184 else if (isym
->st_shndx
== SHN_COMMON
)
9185 isec
= bfd_com_section_ptr
;
9188 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9191 /* Don't attempt to output symbols with st_shnx in the
9192 reserved range other than SHN_ABS and SHN_COMMON. */
9196 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9197 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9199 _bfd_merged_section_offset (output_bfd
, &isec
,
9200 elf_section_data (isec
)->sec_info
,
9206 /* Don't output the first, undefined, symbol. */
9207 if (ppsection
== finfo
->sections
)
9210 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9212 /* We never output section symbols. Instead, we use the
9213 section symbol of the corresponding section in the output
9218 /* If we are stripping all symbols, we don't want to output this
9220 if (finfo
->info
->strip
== strip_all
)
9223 /* If we are discarding all local symbols, we don't want to
9224 output this one. If we are generating a relocatable output
9225 file, then some of the local symbols may be required by
9226 relocs; we output them below as we discover that they are
9228 if (finfo
->info
->discard
== discard_all
)
9231 /* If this symbol is defined in a section which we are
9232 discarding, we don't need to keep it. */
9233 if (isym
->st_shndx
!= SHN_UNDEF
9234 && isym
->st_shndx
< SHN_LORESERVE
9235 && bfd_section_removed_from_list (output_bfd
,
9236 isec
->output_section
))
9239 /* Get the name of the symbol. */
9240 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9245 /* See if we are discarding symbols with this name. */
9246 if ((finfo
->info
->strip
== strip_some
9247 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9249 || (((finfo
->info
->discard
== discard_sec_merge
9250 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9251 || finfo
->info
->discard
== discard_l
)
9252 && bfd_is_local_label_name (input_bfd
, name
)))
9257 /* Adjust the section index for the output file. */
9258 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9259 isec
->output_section
);
9260 if (osym
.st_shndx
== SHN_BAD
)
9263 /* ELF symbols in relocatable files are section relative, but
9264 in executable files they are virtual addresses. Note that
9265 this code assumes that all ELF sections have an associated
9266 BFD section with a reasonable value for output_offset; below
9267 we assume that they also have a reasonable value for
9268 output_section. Any special sections must be set up to meet
9269 these requirements. */
9270 osym
.st_value
+= isec
->output_offset
;
9271 if (! finfo
->info
->relocatable
)
9273 osym
.st_value
+= isec
->output_section
->vma
;
9274 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9276 /* STT_TLS symbols are relative to PT_TLS segment base. */
9277 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9278 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9282 indx
= bfd_get_symcount (output_bfd
);
9283 ret
= elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
);
9290 /* Relocate the contents of each section. */
9291 sym_hashes
= elf_sym_hashes (input_bfd
);
9292 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9296 if (! o
->linker_mark
)
9298 /* This section was omitted from the link. */
9302 if (finfo
->info
->relocatable
9303 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9305 /* Deal with the group signature symbol. */
9306 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9307 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9308 asection
*osec
= o
->output_section
;
9310 if (symndx
>= locsymcount
9311 || (elf_bad_symtab (input_bfd
)
9312 && finfo
->sections
[symndx
] == NULL
))
9314 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9315 while (h
->root
.type
== bfd_link_hash_indirect
9316 || h
->root
.type
== bfd_link_hash_warning
)
9317 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9318 /* Arrange for symbol to be output. */
9320 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9322 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9324 /* We'll use the output section target_index. */
9325 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9326 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9330 if (finfo
->indices
[symndx
] == -1)
9332 /* Otherwise output the local symbol now. */
9333 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9334 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9339 name
= bfd_elf_string_from_elf_section (input_bfd
,
9340 symtab_hdr
->sh_link
,
9345 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9347 if (sym
.st_shndx
== SHN_BAD
)
9350 sym
.st_value
+= o
->output_offset
;
9352 indx
= bfd_get_symcount (output_bfd
);
9353 ret
= elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
);
9357 finfo
->indices
[symndx
] = indx
;
9361 elf_section_data (osec
)->this_hdr
.sh_info
9362 = finfo
->indices
[symndx
];
9366 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9367 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9370 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9372 /* Section was created by _bfd_elf_link_create_dynamic_sections
9377 /* Get the contents of the section. They have been cached by a
9378 relaxation routine. Note that o is a section in an input
9379 file, so the contents field will not have been set by any of
9380 the routines which work on output files. */
9381 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9382 contents
= elf_section_data (o
)->this_hdr
.contents
;
9385 contents
= finfo
->contents
;
9386 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
9390 if ((o
->flags
& SEC_RELOC
) != 0)
9392 Elf_Internal_Rela
*internal_relocs
;
9393 Elf_Internal_Rela
*rel
, *relend
;
9394 bfd_vma r_type_mask
;
9396 int action_discarded
;
9399 /* Get the swapped relocs. */
9401 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9402 finfo
->internal_relocs
, FALSE
);
9403 if (internal_relocs
== NULL
9404 && o
->reloc_count
> 0)
9407 if (bed
->s
->arch_size
== 32)
9414 r_type_mask
= 0xffffffff;
9418 action_discarded
= -1;
9419 if (!elf_section_ignore_discarded_relocs (o
))
9420 action_discarded
= (*bed
->action_discarded
) (o
);
9422 /* Run through the relocs evaluating complex reloc symbols and
9423 looking for relocs against symbols from discarded sections
9424 or section symbols from removed link-once sections.
9425 Complain about relocs against discarded sections. Zero
9426 relocs against removed link-once sections. */
9428 rel
= internal_relocs
;
9429 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9430 for ( ; rel
< relend
; rel
++)
9432 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9433 unsigned int s_type
;
9434 asection
**ps
, *sec
;
9435 struct elf_link_hash_entry
*h
= NULL
;
9436 const char *sym_name
;
9438 if (r_symndx
== STN_UNDEF
)
9441 if (r_symndx
>= locsymcount
9442 || (elf_bad_symtab (input_bfd
)
9443 && finfo
->sections
[r_symndx
] == NULL
))
9445 h
= sym_hashes
[r_symndx
- extsymoff
];
9447 /* Badly formatted input files can contain relocs that
9448 reference non-existant symbols. Check here so that
9449 we do not seg fault. */
9454 sprintf_vma (buffer
, rel
->r_info
);
9455 (*_bfd_error_handler
)
9456 (_("error: %B contains a reloc (0x%s) for section %A "
9457 "that references a non-existent global symbol"),
9458 input_bfd
, o
, buffer
);
9459 bfd_set_error (bfd_error_bad_value
);
9463 while (h
->root
.type
== bfd_link_hash_indirect
9464 || h
->root
.type
== bfd_link_hash_warning
)
9465 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9470 if (h
->root
.type
== bfd_link_hash_defined
9471 || h
->root
.type
== bfd_link_hash_defweak
)
9472 ps
= &h
->root
.u
.def
.section
;
9474 sym_name
= h
->root
.root
.string
;
9478 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9480 s_type
= ELF_ST_TYPE (sym
->st_info
);
9481 ps
= &finfo
->sections
[r_symndx
];
9482 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9486 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9487 && !finfo
->info
->relocatable
)
9490 bfd_vma dot
= (rel
->r_offset
9491 + o
->output_offset
+ o
->output_section
->vma
);
9493 printf ("Encountered a complex symbol!");
9494 printf (" (input_bfd %s, section %s, reloc %ld\n",
9495 input_bfd
->filename
, o
->name
,
9496 (long) (rel
- internal_relocs
));
9497 printf (" symbol: idx %8.8lx, name %s\n",
9498 r_symndx
, sym_name
);
9499 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9500 (unsigned long) rel
->r_info
,
9501 (unsigned long) rel
->r_offset
);
9503 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9504 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9507 /* Symbol evaluated OK. Update to absolute value. */
9508 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9513 if (action_discarded
!= -1 && ps
!= NULL
)
9515 /* Complain if the definition comes from a
9516 discarded section. */
9517 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9519 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9520 if (action_discarded
& COMPLAIN
)
9521 (*finfo
->info
->callbacks
->einfo
)
9522 (_("%X`%s' referenced in section `%A' of %B: "
9523 "defined in discarded section `%A' of %B\n"),
9524 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9526 /* Try to do the best we can to support buggy old
9527 versions of gcc. Pretend that the symbol is
9528 really defined in the kept linkonce section.
9529 FIXME: This is quite broken. Modifying the
9530 symbol here means we will be changing all later
9531 uses of the symbol, not just in this section. */
9532 if (action_discarded
& PRETEND
)
9536 kept
= _bfd_elf_check_kept_section (sec
,
9548 /* Relocate the section by invoking a back end routine.
9550 The back end routine is responsible for adjusting the
9551 section contents as necessary, and (if using Rela relocs
9552 and generating a relocatable output file) adjusting the
9553 reloc addend as necessary.
9555 The back end routine does not have to worry about setting
9556 the reloc address or the reloc symbol index.
9558 The back end routine is given a pointer to the swapped in
9559 internal symbols, and can access the hash table entries
9560 for the external symbols via elf_sym_hashes (input_bfd).
9562 When generating relocatable output, the back end routine
9563 must handle STB_LOCAL/STT_SECTION symbols specially. The
9564 output symbol is going to be a section symbol
9565 corresponding to the output section, which will require
9566 the addend to be adjusted. */
9568 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9569 input_bfd
, o
, contents
,
9577 || finfo
->info
->relocatable
9578 || finfo
->info
->emitrelocations
)
9580 Elf_Internal_Rela
*irela
;
9581 Elf_Internal_Rela
*irelaend
, *irelamid
;
9582 bfd_vma last_offset
;
9583 struct elf_link_hash_entry
**rel_hash
;
9584 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
9585 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
9586 unsigned int next_erel
;
9587 bfd_boolean rela_normal
;
9588 struct bfd_elf_section_data
*esdi
, *esdo
;
9590 esdi
= elf_section_data (o
);
9591 esdo
= elf_section_data (o
->output_section
);
9592 rela_normal
= FALSE
;
9594 /* Adjust the reloc addresses and symbol indices. */
9596 irela
= internal_relocs
;
9597 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9598 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
9599 /* We start processing the REL relocs, if any. When we reach
9600 IRELAMID in the loop, we switch to the RELA relocs. */
9602 if (esdi
->rel
.hdr
!= NULL
)
9603 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
9604 * bed
->s
->int_rels_per_ext_rel
);
9605 rel_hash_list
= rel_hash
;
9606 rela_hash_list
= NULL
;
9607 last_offset
= o
->output_offset
;
9608 if (!finfo
->info
->relocatable
)
9609 last_offset
+= o
->output_section
->vma
;
9610 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9612 unsigned long r_symndx
;
9614 Elf_Internal_Sym sym
;
9616 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9622 if (irela
== irelamid
)
9624 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
9625 rela_hash_list
= rel_hash
;
9626 rela_normal
= bed
->rela_normal
;
9629 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9632 if (irela
->r_offset
>= (bfd_vma
) -2)
9634 /* This is a reloc for a deleted entry or somesuch.
9635 Turn it into an R_*_NONE reloc, at the same
9636 offset as the last reloc. elf_eh_frame.c and
9637 bfd_elf_discard_info rely on reloc offsets
9639 irela
->r_offset
= last_offset
;
9641 irela
->r_addend
= 0;
9645 irela
->r_offset
+= o
->output_offset
;
9647 /* Relocs in an executable have to be virtual addresses. */
9648 if (!finfo
->info
->relocatable
)
9649 irela
->r_offset
+= o
->output_section
->vma
;
9651 last_offset
= irela
->r_offset
;
9653 r_symndx
= irela
->r_info
>> r_sym_shift
;
9654 if (r_symndx
== STN_UNDEF
)
9657 if (r_symndx
>= locsymcount
9658 || (elf_bad_symtab (input_bfd
)
9659 && finfo
->sections
[r_symndx
] == NULL
))
9661 struct elf_link_hash_entry
*rh
;
9664 /* This is a reloc against a global symbol. We
9665 have not yet output all the local symbols, so
9666 we do not know the symbol index of any global
9667 symbol. We set the rel_hash entry for this
9668 reloc to point to the global hash table entry
9669 for this symbol. The symbol index is then
9670 set at the end of bfd_elf_final_link. */
9671 indx
= r_symndx
- extsymoff
;
9672 rh
= elf_sym_hashes (input_bfd
)[indx
];
9673 while (rh
->root
.type
== bfd_link_hash_indirect
9674 || rh
->root
.type
== bfd_link_hash_warning
)
9675 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9677 /* Setting the index to -2 tells
9678 elf_link_output_extsym that this symbol is
9680 BFD_ASSERT (rh
->indx
< 0);
9688 /* This is a reloc against a local symbol. */
9691 sym
= isymbuf
[r_symndx
];
9692 sec
= finfo
->sections
[r_symndx
];
9693 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9695 /* I suppose the backend ought to fill in the
9696 section of any STT_SECTION symbol against a
9697 processor specific section. */
9698 r_symndx
= STN_UNDEF
;
9699 if (bfd_is_abs_section (sec
))
9701 else if (sec
== NULL
|| sec
->owner
== NULL
)
9703 bfd_set_error (bfd_error_bad_value
);
9708 asection
*osec
= sec
->output_section
;
9710 /* If we have discarded a section, the output
9711 section will be the absolute section. In
9712 case of discarded SEC_MERGE sections, use
9713 the kept section. relocate_section should
9714 have already handled discarded linkonce
9716 if (bfd_is_abs_section (osec
)
9717 && sec
->kept_section
!= NULL
9718 && sec
->kept_section
->output_section
!= NULL
)
9720 osec
= sec
->kept_section
->output_section
;
9721 irela
->r_addend
-= osec
->vma
;
9724 if (!bfd_is_abs_section (osec
))
9726 r_symndx
= osec
->target_index
;
9727 if (r_symndx
== STN_UNDEF
)
9729 struct elf_link_hash_table
*htab
;
9732 htab
= elf_hash_table (finfo
->info
);
9733 oi
= htab
->text_index_section
;
9734 if ((osec
->flags
& SEC_READONLY
) == 0
9735 && htab
->data_index_section
!= NULL
)
9736 oi
= htab
->data_index_section
;
9740 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9741 r_symndx
= oi
->target_index
;
9745 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9749 /* Adjust the addend according to where the
9750 section winds up in the output section. */
9752 irela
->r_addend
+= sec
->output_offset
;
9756 if (finfo
->indices
[r_symndx
] == -1)
9758 unsigned long shlink
;
9763 if (finfo
->info
->strip
== strip_all
)
9765 /* You can't do ld -r -s. */
9766 bfd_set_error (bfd_error_invalid_operation
);
9770 /* This symbol was skipped earlier, but
9771 since it is needed by a reloc, we
9772 must output it now. */
9773 shlink
= symtab_hdr
->sh_link
;
9774 name
= (bfd_elf_string_from_elf_section
9775 (input_bfd
, shlink
, sym
.st_name
));
9779 osec
= sec
->output_section
;
9781 _bfd_elf_section_from_bfd_section (output_bfd
,
9783 if (sym
.st_shndx
== SHN_BAD
)
9786 sym
.st_value
+= sec
->output_offset
;
9787 if (! finfo
->info
->relocatable
)
9789 sym
.st_value
+= osec
->vma
;
9790 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9792 /* STT_TLS symbols are relative to PT_TLS
9794 BFD_ASSERT (elf_hash_table (finfo
->info
)
9796 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9801 indx
= bfd_get_symcount (output_bfd
);
9802 ret
= elf_link_output_sym (finfo
, name
, &sym
, sec
,
9807 finfo
->indices
[r_symndx
] = indx
;
9812 r_symndx
= finfo
->indices
[r_symndx
];
9815 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9816 | (irela
->r_info
& r_type_mask
));
9819 /* Swap out the relocs. */
9820 input_rel_hdr
= esdi
->rel
.hdr
;
9821 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
9823 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9828 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9829 * bed
->s
->int_rels_per_ext_rel
);
9830 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9833 input_rela_hdr
= esdi
->rela
.hdr
;
9834 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
9836 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9845 /* Write out the modified section contents. */
9846 if (bed
->elf_backend_write_section
9847 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9850 /* Section written out. */
9852 else switch (o
->sec_info_type
)
9854 case ELF_INFO_TYPE_STABS
:
9855 if (! (_bfd_write_section_stabs
9857 &elf_hash_table (finfo
->info
)->stab_info
,
9858 o
, &elf_section_data (o
)->sec_info
, contents
)))
9861 case ELF_INFO_TYPE_MERGE
:
9862 if (! _bfd_write_merged_section (output_bfd
, o
,
9863 elf_section_data (o
)->sec_info
))
9866 case ELF_INFO_TYPE_EH_FRAME
:
9868 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9875 /* FIXME: octets_per_byte. */
9876 if (! (o
->flags
& SEC_EXCLUDE
)
9877 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9879 (file_ptr
) o
->output_offset
,
9890 /* Generate a reloc when linking an ELF file. This is a reloc
9891 requested by the linker, and does not come from any input file. This
9892 is used to build constructor and destructor tables when linking
9896 elf_reloc_link_order (bfd
*output_bfd
,
9897 struct bfd_link_info
*info
,
9898 asection
*output_section
,
9899 struct bfd_link_order
*link_order
)
9901 reloc_howto_type
*howto
;
9905 struct bfd_elf_section_reloc_data
*reldata
;
9906 struct elf_link_hash_entry
**rel_hash_ptr
;
9907 Elf_Internal_Shdr
*rel_hdr
;
9908 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9909 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9912 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
9914 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9917 bfd_set_error (bfd_error_bad_value
);
9921 addend
= link_order
->u
.reloc
.p
->addend
;
9924 reldata
= &esdo
->rel
;
9925 else if (esdo
->rela
.hdr
)
9926 reldata
= &esdo
->rela
;
9933 /* Figure out the symbol index. */
9934 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
9935 if (link_order
->type
== bfd_section_reloc_link_order
)
9937 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9938 BFD_ASSERT (indx
!= 0);
9939 *rel_hash_ptr
= NULL
;
9943 struct elf_link_hash_entry
*h
;
9945 /* Treat a reloc against a defined symbol as though it were
9946 actually against the section. */
9947 h
= ((struct elf_link_hash_entry
*)
9948 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9949 link_order
->u
.reloc
.p
->u
.name
,
9950 FALSE
, FALSE
, TRUE
));
9952 && (h
->root
.type
== bfd_link_hash_defined
9953 || h
->root
.type
== bfd_link_hash_defweak
))
9957 section
= h
->root
.u
.def
.section
;
9958 indx
= section
->output_section
->target_index
;
9959 *rel_hash_ptr
= NULL
;
9960 /* It seems that we ought to add the symbol value to the
9961 addend here, but in practice it has already been added
9962 because it was passed to constructor_callback. */
9963 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9967 /* Setting the index to -2 tells elf_link_output_extsym that
9968 this symbol is used by a reloc. */
9975 if (! ((*info
->callbacks
->unattached_reloc
)
9976 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9982 /* If this is an inplace reloc, we must write the addend into the
9984 if (howto
->partial_inplace
&& addend
!= 0)
9987 bfd_reloc_status_type rstat
;
9990 const char *sym_name
;
9992 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
9993 buf
= (bfd_byte
*) bfd_zmalloc (size
);
9996 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
10003 case bfd_reloc_outofrange
:
10006 case bfd_reloc_overflow
:
10007 if (link_order
->type
== bfd_section_reloc_link_order
)
10008 sym_name
= bfd_section_name (output_bfd
,
10009 link_order
->u
.reloc
.p
->u
.section
);
10011 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
10012 if (! ((*info
->callbacks
->reloc_overflow
)
10013 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
10014 NULL
, (bfd_vma
) 0)))
10021 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
10022 link_order
->offset
, size
);
10028 /* The address of a reloc is relative to the section in a
10029 relocatable file, and is a virtual address in an executable
10031 offset
= link_order
->offset
;
10032 if (! info
->relocatable
)
10033 offset
+= output_section
->vma
;
10035 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
10037 irel
[i
].r_offset
= offset
;
10038 irel
[i
].r_info
= 0;
10039 irel
[i
].r_addend
= 0;
10041 if (bed
->s
->arch_size
== 32)
10042 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
10044 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
10046 rel_hdr
= reldata
->hdr
;
10047 erel
= rel_hdr
->contents
;
10048 if (rel_hdr
->sh_type
== SHT_REL
)
10050 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
10051 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
10055 irel
[0].r_addend
= addend
;
10056 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
10057 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
10066 /* Get the output vma of the section pointed to by the sh_link field. */
10069 elf_get_linked_section_vma (struct bfd_link_order
*p
)
10071 Elf_Internal_Shdr
**elf_shdrp
;
10075 s
= p
->u
.indirect
.section
;
10076 elf_shdrp
= elf_elfsections (s
->owner
);
10077 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
10078 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
10080 The Intel C compiler generates SHT_IA_64_UNWIND with
10081 SHF_LINK_ORDER. But it doesn't set the sh_link or
10082 sh_info fields. Hence we could get the situation
10083 where elfsec is 0. */
10086 const struct elf_backend_data
*bed
10087 = get_elf_backend_data (s
->owner
);
10088 if (bed
->link_order_error_handler
)
10089 bed
->link_order_error_handler
10090 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10095 s
= elf_shdrp
[elfsec
]->bfd_section
;
10096 return s
->output_section
->vma
+ s
->output_offset
;
10101 /* Compare two sections based on the locations of the sections they are
10102 linked to. Used by elf_fixup_link_order. */
10105 compare_link_order (const void * a
, const void * b
)
10110 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
10111 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
10114 return apos
> bpos
;
10118 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10119 order as their linked sections. Returns false if this could not be done
10120 because an output section includes both ordered and unordered
10121 sections. Ideally we'd do this in the linker proper. */
10124 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
10126 int seen_linkorder
;
10129 struct bfd_link_order
*p
;
10131 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10133 struct bfd_link_order
**sections
;
10134 asection
*s
, *other_sec
, *linkorder_sec
;
10138 linkorder_sec
= NULL
;
10140 seen_linkorder
= 0;
10141 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10143 if (p
->type
== bfd_indirect_link_order
)
10145 s
= p
->u
.indirect
.section
;
10147 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10148 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
10149 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
10150 && elfsec
< elf_numsections (sub
)
10151 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
10152 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
10166 if (seen_other
&& seen_linkorder
)
10168 if (other_sec
&& linkorder_sec
)
10169 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10171 linkorder_sec
->owner
, other_sec
,
10174 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10176 bfd_set_error (bfd_error_bad_value
);
10181 if (!seen_linkorder
)
10184 sections
= (struct bfd_link_order
**)
10185 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10186 if (sections
== NULL
)
10188 seen_linkorder
= 0;
10190 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10192 sections
[seen_linkorder
++] = p
;
10194 /* Sort the input sections in the order of their linked section. */
10195 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10196 compare_link_order
);
10198 /* Change the offsets of the sections. */
10200 for (n
= 0; n
< seen_linkorder
; n
++)
10202 s
= sections
[n
]->u
.indirect
.section
;
10203 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10204 s
->output_offset
= offset
;
10205 sections
[n
]->offset
= offset
;
10206 /* FIXME: octets_per_byte. */
10207 offset
+= sections
[n
]->size
;
10215 /* Do the final step of an ELF link. */
10218 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10220 bfd_boolean dynamic
;
10221 bfd_boolean emit_relocs
;
10223 struct elf_final_link_info finfo
;
10225 struct bfd_link_order
*p
;
10227 bfd_size_type max_contents_size
;
10228 bfd_size_type max_external_reloc_size
;
10229 bfd_size_type max_internal_reloc_count
;
10230 bfd_size_type max_sym_count
;
10231 bfd_size_type max_sym_shndx_count
;
10233 Elf_Internal_Sym elfsym
;
10235 Elf_Internal_Shdr
*symtab_hdr
;
10236 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10237 Elf_Internal_Shdr
*symstrtab_hdr
;
10238 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10239 struct elf_outext_info eoinfo
;
10240 bfd_boolean merged
;
10241 size_t relativecount
= 0;
10242 asection
*reldyn
= 0;
10244 asection
*attr_section
= NULL
;
10245 bfd_vma attr_size
= 0;
10246 const char *std_attrs_section
;
10248 if (! is_elf_hash_table (info
->hash
))
10252 abfd
->flags
|= DYNAMIC
;
10254 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10255 dynobj
= elf_hash_table (info
)->dynobj
;
10257 emit_relocs
= (info
->relocatable
10258 || info
->emitrelocations
);
10261 finfo
.output_bfd
= abfd
;
10262 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10263 if (finfo
.symstrtab
== NULL
)
10268 finfo
.dynsym_sec
= NULL
;
10269 finfo
.hash_sec
= NULL
;
10270 finfo
.symver_sec
= NULL
;
10274 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10275 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10276 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10277 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10278 /* Note that it is OK if symver_sec is NULL. */
10281 finfo
.contents
= NULL
;
10282 finfo
.external_relocs
= NULL
;
10283 finfo
.internal_relocs
= NULL
;
10284 finfo
.external_syms
= NULL
;
10285 finfo
.locsym_shndx
= NULL
;
10286 finfo
.internal_syms
= NULL
;
10287 finfo
.indices
= NULL
;
10288 finfo
.sections
= NULL
;
10289 finfo
.symbuf
= NULL
;
10290 finfo
.symshndxbuf
= NULL
;
10291 finfo
.symbuf_count
= 0;
10292 finfo
.shndxbuf_size
= 0;
10294 /* The object attributes have been merged. Remove the input
10295 sections from the link, and set the contents of the output
10297 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10298 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10300 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10301 || strcmp (o
->name
, ".gnu.attributes") == 0)
10303 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10305 asection
*input_section
;
10307 if (p
->type
!= bfd_indirect_link_order
)
10309 input_section
= p
->u
.indirect
.section
;
10310 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10311 elf_link_input_bfd ignores this section. */
10312 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10315 attr_size
= bfd_elf_obj_attr_size (abfd
);
10318 bfd_set_section_size (abfd
, o
, attr_size
);
10320 /* Skip this section later on. */
10321 o
->map_head
.link_order
= NULL
;
10324 o
->flags
|= SEC_EXCLUDE
;
10328 /* Count up the number of relocations we will output for each output
10329 section, so that we know the sizes of the reloc sections. We
10330 also figure out some maximum sizes. */
10331 max_contents_size
= 0;
10332 max_external_reloc_size
= 0;
10333 max_internal_reloc_count
= 0;
10335 max_sym_shndx_count
= 0;
10337 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10339 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10340 o
->reloc_count
= 0;
10342 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10344 unsigned int reloc_count
= 0;
10345 struct bfd_elf_section_data
*esdi
= NULL
;
10347 if (p
->type
== bfd_section_reloc_link_order
10348 || p
->type
== bfd_symbol_reloc_link_order
)
10350 else if (p
->type
== bfd_indirect_link_order
)
10354 sec
= p
->u
.indirect
.section
;
10355 esdi
= elf_section_data (sec
);
10357 /* Mark all sections which are to be included in the
10358 link. This will normally be every section. We need
10359 to do this so that we can identify any sections which
10360 the linker has decided to not include. */
10361 sec
->linker_mark
= TRUE
;
10363 if (sec
->flags
& SEC_MERGE
)
10366 if (info
->relocatable
|| info
->emitrelocations
)
10367 reloc_count
= sec
->reloc_count
;
10368 else if (bed
->elf_backend_count_relocs
)
10369 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10371 if (sec
->rawsize
> max_contents_size
)
10372 max_contents_size
= sec
->rawsize
;
10373 if (sec
->size
> max_contents_size
)
10374 max_contents_size
= sec
->size
;
10376 /* We are interested in just local symbols, not all
10378 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10379 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10383 if (elf_bad_symtab (sec
->owner
))
10384 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10385 / bed
->s
->sizeof_sym
);
10387 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10389 if (sym_count
> max_sym_count
)
10390 max_sym_count
= sym_count
;
10392 if (sym_count
> max_sym_shndx_count
10393 && elf_symtab_shndx (sec
->owner
) != 0)
10394 max_sym_shndx_count
= sym_count
;
10396 if ((sec
->flags
& SEC_RELOC
) != 0)
10398 size_t ext_size
= 0;
10400 if (esdi
->rel
.hdr
!= NULL
)
10401 ext_size
= esdi
->rel
.hdr
->sh_size
;
10402 if (esdi
->rela
.hdr
!= NULL
)
10403 ext_size
+= esdi
->rela
.hdr
->sh_size
;
10405 if (ext_size
> max_external_reloc_size
)
10406 max_external_reloc_size
= ext_size
;
10407 if (sec
->reloc_count
> max_internal_reloc_count
)
10408 max_internal_reloc_count
= sec
->reloc_count
;
10413 if (reloc_count
== 0)
10416 o
->reloc_count
+= reloc_count
;
10418 if (p
->type
== bfd_indirect_link_order
10419 && (info
->relocatable
|| info
->emitrelocations
))
10422 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
10423 if (esdi
->rela
.hdr
)
10424 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
10429 esdo
->rela
.count
+= reloc_count
;
10431 esdo
->rel
.count
+= reloc_count
;
10435 if (o
->reloc_count
> 0)
10436 o
->flags
|= SEC_RELOC
;
10439 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10440 set it (this is probably a bug) and if it is set
10441 assign_section_numbers will create a reloc section. */
10442 o
->flags
&=~ SEC_RELOC
;
10445 /* If the SEC_ALLOC flag is not set, force the section VMA to
10446 zero. This is done in elf_fake_sections as well, but forcing
10447 the VMA to 0 here will ensure that relocs against these
10448 sections are handled correctly. */
10449 if ((o
->flags
& SEC_ALLOC
) == 0
10450 && ! o
->user_set_vma
)
10454 if (! info
->relocatable
&& merged
)
10455 elf_link_hash_traverse (elf_hash_table (info
),
10456 _bfd_elf_link_sec_merge_syms
, abfd
);
10458 /* Figure out the file positions for everything but the symbol table
10459 and the relocs. We set symcount to force assign_section_numbers
10460 to create a symbol table. */
10461 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10462 BFD_ASSERT (! abfd
->output_has_begun
);
10463 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10466 /* Set sizes, and assign file positions for reloc sections. */
10467 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10469 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10470 if ((o
->flags
& SEC_RELOC
) != 0)
10473 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
10477 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
10481 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10482 to count upwards while actually outputting the relocations. */
10483 esdo
->rel
.count
= 0;
10484 esdo
->rela
.count
= 0;
10487 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10489 /* We have now assigned file positions for all the sections except
10490 .symtab and .strtab. We start the .symtab section at the current
10491 file position, and write directly to it. We build the .strtab
10492 section in memory. */
10493 bfd_get_symcount (abfd
) = 0;
10494 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10495 /* sh_name is set in prep_headers. */
10496 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10497 /* sh_flags, sh_addr and sh_size all start off zero. */
10498 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10499 /* sh_link is set in assign_section_numbers. */
10500 /* sh_info is set below. */
10501 /* sh_offset is set just below. */
10502 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10504 off
= elf_tdata (abfd
)->next_file_pos
;
10505 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10507 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10508 incorrect. We do not yet know the size of the .symtab section.
10509 We correct next_file_pos below, after we do know the size. */
10511 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10512 continuously seeking to the right position in the file. */
10513 if (! info
->keep_memory
|| max_sym_count
< 20)
10514 finfo
.symbuf_size
= 20;
10516 finfo
.symbuf_size
= max_sym_count
;
10517 amt
= finfo
.symbuf_size
;
10518 amt
*= bed
->s
->sizeof_sym
;
10519 finfo
.symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10520 if (finfo
.symbuf
== NULL
)
10522 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10524 /* Wild guess at number of output symbols. realloc'd as needed. */
10525 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10526 finfo
.shndxbuf_size
= amt
;
10527 amt
*= sizeof (Elf_External_Sym_Shndx
);
10528 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10529 if (finfo
.symshndxbuf
== NULL
)
10533 /* Start writing out the symbol table. The first symbol is always a
10535 if (info
->strip
!= strip_all
10538 elfsym
.st_value
= 0;
10539 elfsym
.st_size
= 0;
10540 elfsym
.st_info
= 0;
10541 elfsym
.st_other
= 0;
10542 elfsym
.st_shndx
= SHN_UNDEF
;
10543 elfsym
.st_target_internal
= 0;
10544 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10549 /* Output a symbol for each section. We output these even if we are
10550 discarding local symbols, since they are used for relocs. These
10551 symbols have no names. We store the index of each one in the
10552 index field of the section, so that we can find it again when
10553 outputting relocs. */
10554 if (info
->strip
!= strip_all
10557 elfsym
.st_size
= 0;
10558 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10559 elfsym
.st_other
= 0;
10560 elfsym
.st_value
= 0;
10561 elfsym
.st_target_internal
= 0;
10562 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10564 o
= bfd_section_from_elf_index (abfd
, i
);
10567 o
->target_index
= bfd_get_symcount (abfd
);
10568 elfsym
.st_shndx
= i
;
10569 if (!info
->relocatable
)
10570 elfsym
.st_value
= o
->vma
;
10571 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10577 /* Allocate some memory to hold information read in from the input
10579 if (max_contents_size
!= 0)
10581 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
10582 if (finfo
.contents
== NULL
)
10586 if (max_external_reloc_size
!= 0)
10588 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10589 if (finfo
.external_relocs
== NULL
)
10593 if (max_internal_reloc_count
!= 0)
10595 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10596 amt
*= sizeof (Elf_Internal_Rela
);
10597 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
10598 if (finfo
.internal_relocs
== NULL
)
10602 if (max_sym_count
!= 0)
10604 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10605 finfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
10606 if (finfo
.external_syms
== NULL
)
10609 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10610 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
10611 if (finfo
.internal_syms
== NULL
)
10614 amt
= max_sym_count
* sizeof (long);
10615 finfo
.indices
= (long int *) bfd_malloc (amt
);
10616 if (finfo
.indices
== NULL
)
10619 amt
= max_sym_count
* sizeof (asection
*);
10620 finfo
.sections
= (asection
**) bfd_malloc (amt
);
10621 if (finfo
.sections
== NULL
)
10625 if (max_sym_shndx_count
!= 0)
10627 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10628 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
10629 if (finfo
.locsym_shndx
== NULL
)
10633 if (elf_hash_table (info
)->tls_sec
)
10635 bfd_vma base
, end
= 0;
10638 for (sec
= elf_hash_table (info
)->tls_sec
;
10639 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10642 bfd_size_type size
= sec
->size
;
10645 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10647 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
10650 size
= ord
->offset
+ ord
->size
;
10652 end
= sec
->vma
+ size
;
10654 base
= elf_hash_table (info
)->tls_sec
->vma
;
10655 /* Only align end of TLS section if static TLS doesn't have special
10656 alignment requirements. */
10657 if (bed
->static_tls_alignment
== 1)
10658 end
= align_power (end
,
10659 elf_hash_table (info
)->tls_sec
->alignment_power
);
10660 elf_hash_table (info
)->tls_size
= end
- base
;
10663 /* Reorder SHF_LINK_ORDER sections. */
10664 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10666 if (!elf_fixup_link_order (abfd
, o
))
10670 /* Since ELF permits relocations to be against local symbols, we
10671 must have the local symbols available when we do the relocations.
10672 Since we would rather only read the local symbols once, and we
10673 would rather not keep them in memory, we handle all the
10674 relocations for a single input file at the same time.
10676 Unfortunately, there is no way to know the total number of local
10677 symbols until we have seen all of them, and the local symbol
10678 indices precede the global symbol indices. This means that when
10679 we are generating relocatable output, and we see a reloc against
10680 a global symbol, we can not know the symbol index until we have
10681 finished examining all the local symbols to see which ones we are
10682 going to output. To deal with this, we keep the relocations in
10683 memory, and don't output them until the end of the link. This is
10684 an unfortunate waste of memory, but I don't see a good way around
10685 it. Fortunately, it only happens when performing a relocatable
10686 link, which is not the common case. FIXME: If keep_memory is set
10687 we could write the relocs out and then read them again; I don't
10688 know how bad the memory loss will be. */
10690 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10691 sub
->output_has_begun
= FALSE
;
10692 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10694 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10696 if (p
->type
== bfd_indirect_link_order
10697 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10698 == bfd_target_elf_flavour
)
10699 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10701 if (! sub
->output_has_begun
)
10703 if (! elf_link_input_bfd (&finfo
, sub
))
10705 sub
->output_has_begun
= TRUE
;
10708 else if (p
->type
== bfd_section_reloc_link_order
10709 || p
->type
== bfd_symbol_reloc_link_order
)
10711 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10716 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10718 if (p
->type
== bfd_indirect_link_order
10719 && (bfd_get_flavour (sub
)
10720 == bfd_target_elf_flavour
)
10721 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
10722 != bed
->s
->elfclass
))
10724 const char *iclass
, *oclass
;
10726 if (bed
->s
->elfclass
== ELFCLASS64
)
10728 iclass
= "ELFCLASS32";
10729 oclass
= "ELFCLASS64";
10733 iclass
= "ELFCLASS64";
10734 oclass
= "ELFCLASS32";
10737 bfd_set_error (bfd_error_wrong_format
);
10738 (*_bfd_error_handler
)
10739 (_("%B: file class %s incompatible with %s"),
10740 sub
, iclass
, oclass
);
10749 /* Free symbol buffer if needed. */
10750 if (!info
->reduce_memory_overheads
)
10752 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10753 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10754 && elf_tdata (sub
)->symbuf
)
10756 free (elf_tdata (sub
)->symbuf
);
10757 elf_tdata (sub
)->symbuf
= NULL
;
10761 /* Output any global symbols that got converted to local in a
10762 version script or due to symbol visibility. We do this in a
10763 separate step since ELF requires all local symbols to appear
10764 prior to any global symbols. FIXME: We should only do this if
10765 some global symbols were, in fact, converted to become local.
10766 FIXME: Will this work correctly with the Irix 5 linker? */
10767 eoinfo
.failed
= FALSE
;
10768 eoinfo
.finfo
= &finfo
;
10769 eoinfo
.localsyms
= TRUE
;
10770 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10775 /* If backend needs to output some local symbols not present in the hash
10776 table, do it now. */
10777 if (bed
->elf_backend_output_arch_local_syms
)
10779 typedef int (*out_sym_func
)
10780 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10781 struct elf_link_hash_entry
*);
10783 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10784 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10788 /* That wrote out all the local symbols. Finish up the symbol table
10789 with the global symbols. Even if we want to strip everything we
10790 can, we still need to deal with those global symbols that got
10791 converted to local in a version script. */
10793 /* The sh_info field records the index of the first non local symbol. */
10794 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10797 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10799 Elf_Internal_Sym sym
;
10800 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10801 long last_local
= 0;
10803 /* Write out the section symbols for the output sections. */
10804 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10810 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10812 sym
.st_target_internal
= 0;
10814 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10820 dynindx
= elf_section_data (s
)->dynindx
;
10823 indx
= elf_section_data (s
)->this_idx
;
10824 BFD_ASSERT (indx
> 0);
10825 sym
.st_shndx
= indx
;
10826 if (! check_dynsym (abfd
, &sym
))
10828 sym
.st_value
= s
->vma
;
10829 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10830 if (last_local
< dynindx
)
10831 last_local
= dynindx
;
10832 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10836 /* Write out the local dynsyms. */
10837 if (elf_hash_table (info
)->dynlocal
)
10839 struct elf_link_local_dynamic_entry
*e
;
10840 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10845 /* Copy the internal symbol and turn off visibility.
10846 Note that we saved a word of storage and overwrote
10847 the original st_name with the dynstr_index. */
10849 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10851 s
= bfd_section_from_elf_index (e
->input_bfd
,
10856 elf_section_data (s
->output_section
)->this_idx
;
10857 if (! check_dynsym (abfd
, &sym
))
10859 sym
.st_value
= (s
->output_section
->vma
10861 + e
->isym
.st_value
);
10864 if (last_local
< e
->dynindx
)
10865 last_local
= e
->dynindx
;
10867 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10868 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10872 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10876 /* We get the global symbols from the hash table. */
10877 eoinfo
.failed
= FALSE
;
10878 eoinfo
.localsyms
= FALSE
;
10879 eoinfo
.finfo
= &finfo
;
10880 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10885 /* If backend needs to output some symbols not present in the hash
10886 table, do it now. */
10887 if (bed
->elf_backend_output_arch_syms
)
10889 typedef int (*out_sym_func
)
10890 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10891 struct elf_link_hash_entry
*);
10893 if (! ((*bed
->elf_backend_output_arch_syms
)
10894 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10898 /* Flush all symbols to the file. */
10899 if (! elf_link_flush_output_syms (&finfo
, bed
))
10902 /* Now we know the size of the symtab section. */
10903 off
+= symtab_hdr
->sh_size
;
10905 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10906 if (symtab_shndx_hdr
->sh_name
!= 0)
10908 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10909 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10910 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10911 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10912 symtab_shndx_hdr
->sh_size
= amt
;
10914 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10917 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10918 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10923 /* Finish up and write out the symbol string table (.strtab)
10925 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10926 /* sh_name was set in prep_headers. */
10927 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10928 symstrtab_hdr
->sh_flags
= 0;
10929 symstrtab_hdr
->sh_addr
= 0;
10930 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10931 symstrtab_hdr
->sh_entsize
= 0;
10932 symstrtab_hdr
->sh_link
= 0;
10933 symstrtab_hdr
->sh_info
= 0;
10934 /* sh_offset is set just below. */
10935 symstrtab_hdr
->sh_addralign
= 1;
10937 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10938 elf_tdata (abfd
)->next_file_pos
= off
;
10940 if (bfd_get_symcount (abfd
) > 0)
10942 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10943 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10947 /* Adjust the relocs to have the correct symbol indices. */
10948 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10950 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10951 if ((o
->flags
& SEC_RELOC
) == 0)
10954 if (esdo
->rel
.hdr
!= NULL
)
10955 elf_link_adjust_relocs (abfd
, &esdo
->rel
);
10956 if (esdo
->rela
.hdr
!= NULL
)
10957 elf_link_adjust_relocs (abfd
, &esdo
->rela
);
10959 /* Set the reloc_count field to 0 to prevent write_relocs from
10960 trying to swap the relocs out itself. */
10961 o
->reloc_count
= 0;
10964 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10965 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10967 /* If we are linking against a dynamic object, or generating a
10968 shared library, finish up the dynamic linking information. */
10971 bfd_byte
*dyncon
, *dynconend
;
10973 /* Fix up .dynamic entries. */
10974 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10975 BFD_ASSERT (o
!= NULL
);
10977 dyncon
= o
->contents
;
10978 dynconend
= o
->contents
+ o
->size
;
10979 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10981 Elf_Internal_Dyn dyn
;
10985 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10992 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10994 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10996 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10997 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
11000 dyn
.d_un
.d_val
= relativecount
;
11007 name
= info
->init_function
;
11010 name
= info
->fini_function
;
11013 struct elf_link_hash_entry
*h
;
11015 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
11016 FALSE
, FALSE
, TRUE
);
11018 && (h
->root
.type
== bfd_link_hash_defined
11019 || h
->root
.type
== bfd_link_hash_defweak
))
11021 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
11022 o
= h
->root
.u
.def
.section
;
11023 if (o
->output_section
!= NULL
)
11024 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
11025 + o
->output_offset
);
11028 /* The symbol is imported from another shared
11029 library and does not apply to this one. */
11030 dyn
.d_un
.d_ptr
= 0;
11037 case DT_PREINIT_ARRAYSZ
:
11038 name
= ".preinit_array";
11040 case DT_INIT_ARRAYSZ
:
11041 name
= ".init_array";
11043 case DT_FINI_ARRAYSZ
:
11044 name
= ".fini_array";
11046 o
= bfd_get_section_by_name (abfd
, name
);
11049 (*_bfd_error_handler
)
11050 (_("%B: could not find output section %s"), abfd
, name
);
11054 (*_bfd_error_handler
)
11055 (_("warning: %s section has zero size"), name
);
11056 dyn
.d_un
.d_val
= o
->size
;
11059 case DT_PREINIT_ARRAY
:
11060 name
= ".preinit_array";
11062 case DT_INIT_ARRAY
:
11063 name
= ".init_array";
11065 case DT_FINI_ARRAY
:
11066 name
= ".fini_array";
11073 name
= ".gnu.hash";
11082 name
= ".gnu.version_d";
11085 name
= ".gnu.version_r";
11088 name
= ".gnu.version";
11090 o
= bfd_get_section_by_name (abfd
, name
);
11093 (*_bfd_error_handler
)
11094 (_("%B: could not find output section %s"), abfd
, name
);
11097 dyn
.d_un
.d_ptr
= o
->vma
;
11104 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
11108 dyn
.d_un
.d_val
= 0;
11109 dyn
.d_un
.d_ptr
= 0;
11110 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11112 Elf_Internal_Shdr
*hdr
;
11114 hdr
= elf_elfsections (abfd
)[i
];
11115 if (hdr
->sh_type
== type
11116 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
11118 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
11119 dyn
.d_un
.d_val
+= hdr
->sh_size
;
11122 if (dyn
.d_un
.d_ptr
== 0
11123 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
11124 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
11130 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
11134 /* If we have created any dynamic sections, then output them. */
11135 if (dynobj
!= NULL
)
11137 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
11140 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11141 if (info
->warn_shared_textrel
&& info
->shared
)
11143 bfd_byte
*dyncon
, *dynconend
;
11145 /* Fix up .dynamic entries. */
11146 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
11147 BFD_ASSERT (o
!= NULL
);
11149 dyncon
= o
->contents
;
11150 dynconend
= o
->contents
+ o
->size
;
11151 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11153 Elf_Internal_Dyn dyn
;
11155 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11157 if (dyn
.d_tag
== DT_TEXTREL
)
11159 info
->callbacks
->einfo
11160 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11166 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
11168 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11170 || o
->output_section
== bfd_abs_section_ptr
)
11172 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11174 /* At this point, we are only interested in sections
11175 created by _bfd_elf_link_create_dynamic_sections. */
11178 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11180 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11182 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
11184 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
11186 /* FIXME: octets_per_byte. */
11187 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11189 (file_ptr
) o
->output_offset
,
11195 /* The contents of the .dynstr section are actually in a
11197 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11198 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11199 || ! _bfd_elf_strtab_emit (abfd
,
11200 elf_hash_table (info
)->dynstr
))
11206 if (info
->relocatable
)
11208 bfd_boolean failed
= FALSE
;
11210 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11215 /* If we have optimized stabs strings, output them. */
11216 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11218 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11222 if (info
->eh_frame_hdr
)
11224 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11228 if (finfo
.symstrtab
!= NULL
)
11229 _bfd_stringtab_free (finfo
.symstrtab
);
11230 if (finfo
.contents
!= NULL
)
11231 free (finfo
.contents
);
11232 if (finfo
.external_relocs
!= NULL
)
11233 free (finfo
.external_relocs
);
11234 if (finfo
.internal_relocs
!= NULL
)
11235 free (finfo
.internal_relocs
);
11236 if (finfo
.external_syms
!= NULL
)
11237 free (finfo
.external_syms
);
11238 if (finfo
.locsym_shndx
!= NULL
)
11239 free (finfo
.locsym_shndx
);
11240 if (finfo
.internal_syms
!= NULL
)
11241 free (finfo
.internal_syms
);
11242 if (finfo
.indices
!= NULL
)
11243 free (finfo
.indices
);
11244 if (finfo
.sections
!= NULL
)
11245 free (finfo
.sections
);
11246 if (finfo
.symbuf
!= NULL
)
11247 free (finfo
.symbuf
);
11248 if (finfo
.symshndxbuf
!= NULL
)
11249 free (finfo
.symshndxbuf
);
11250 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11252 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11253 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11254 free (esdo
->rel
.hashes
);
11255 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11256 free (esdo
->rela
.hashes
);
11259 elf_tdata (abfd
)->linker
= TRUE
;
11263 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
11264 if (contents
== NULL
)
11265 return FALSE
; /* Bail out and fail. */
11266 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11267 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11274 if (finfo
.symstrtab
!= NULL
)
11275 _bfd_stringtab_free (finfo
.symstrtab
);
11276 if (finfo
.contents
!= NULL
)
11277 free (finfo
.contents
);
11278 if (finfo
.external_relocs
!= NULL
)
11279 free (finfo
.external_relocs
);
11280 if (finfo
.internal_relocs
!= NULL
)
11281 free (finfo
.internal_relocs
);
11282 if (finfo
.external_syms
!= NULL
)
11283 free (finfo
.external_syms
);
11284 if (finfo
.locsym_shndx
!= NULL
)
11285 free (finfo
.locsym_shndx
);
11286 if (finfo
.internal_syms
!= NULL
)
11287 free (finfo
.internal_syms
);
11288 if (finfo
.indices
!= NULL
)
11289 free (finfo
.indices
);
11290 if (finfo
.sections
!= NULL
)
11291 free (finfo
.sections
);
11292 if (finfo
.symbuf
!= NULL
)
11293 free (finfo
.symbuf
);
11294 if (finfo
.symshndxbuf
!= NULL
)
11295 free (finfo
.symshndxbuf
);
11296 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11298 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11299 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11300 free (esdo
->rel
.hashes
);
11301 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11302 free (esdo
->rela
.hashes
);
11308 /* Initialize COOKIE for input bfd ABFD. */
11311 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11312 struct bfd_link_info
*info
, bfd
*abfd
)
11314 Elf_Internal_Shdr
*symtab_hdr
;
11315 const struct elf_backend_data
*bed
;
11317 bed
= get_elf_backend_data (abfd
);
11318 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11320 cookie
->abfd
= abfd
;
11321 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11322 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11323 if (cookie
->bad_symtab
)
11325 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11326 cookie
->extsymoff
= 0;
11330 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11331 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11334 if (bed
->s
->arch_size
== 32)
11335 cookie
->r_sym_shift
= 8;
11337 cookie
->r_sym_shift
= 32;
11339 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11340 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11342 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11343 cookie
->locsymcount
, 0,
11345 if (cookie
->locsyms
== NULL
)
11347 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11350 if (info
->keep_memory
)
11351 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11356 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11359 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11361 Elf_Internal_Shdr
*symtab_hdr
;
11363 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11364 if (cookie
->locsyms
!= NULL
11365 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11366 free (cookie
->locsyms
);
11369 /* Initialize the relocation information in COOKIE for input section SEC
11370 of input bfd ABFD. */
11373 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11374 struct bfd_link_info
*info
, bfd
*abfd
,
11377 const struct elf_backend_data
*bed
;
11379 if (sec
->reloc_count
== 0)
11381 cookie
->rels
= NULL
;
11382 cookie
->relend
= NULL
;
11386 bed
= get_elf_backend_data (abfd
);
11388 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11389 info
->keep_memory
);
11390 if (cookie
->rels
== NULL
)
11392 cookie
->rel
= cookie
->rels
;
11393 cookie
->relend
= (cookie
->rels
11394 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11396 cookie
->rel
= cookie
->rels
;
11400 /* Free the memory allocated by init_reloc_cookie_rels,
11404 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11407 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11408 free (cookie
->rels
);
11411 /* Initialize the whole of COOKIE for input section SEC. */
11414 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11415 struct bfd_link_info
*info
,
11418 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11420 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11425 fini_reloc_cookie (cookie
, sec
->owner
);
11430 /* Free the memory allocated by init_reloc_cookie_for_section,
11434 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11437 fini_reloc_cookie_rels (cookie
, sec
);
11438 fini_reloc_cookie (cookie
, sec
->owner
);
11441 /* Garbage collect unused sections. */
11443 /* Default gc_mark_hook. */
11446 _bfd_elf_gc_mark_hook (asection
*sec
,
11447 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11448 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11449 struct elf_link_hash_entry
*h
,
11450 Elf_Internal_Sym
*sym
)
11452 const char *sec_name
;
11456 switch (h
->root
.type
)
11458 case bfd_link_hash_defined
:
11459 case bfd_link_hash_defweak
:
11460 return h
->root
.u
.def
.section
;
11462 case bfd_link_hash_common
:
11463 return h
->root
.u
.c
.p
->section
;
11465 case bfd_link_hash_undefined
:
11466 case bfd_link_hash_undefweak
:
11467 /* To work around a glibc bug, keep all XXX input sections
11468 when there is an as yet undefined reference to __start_XXX
11469 or __stop_XXX symbols. The linker will later define such
11470 symbols for orphan input sections that have a name
11471 representable as a C identifier. */
11472 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
11473 sec_name
= h
->root
.root
.string
+ 8;
11474 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
11475 sec_name
= h
->root
.root
.string
+ 7;
11479 if (sec_name
&& *sec_name
!= '\0')
11483 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11485 sec
= bfd_get_section_by_name (i
, sec_name
);
11487 sec
->flags
|= SEC_KEEP
;
11497 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11502 /* COOKIE->rel describes a relocation against section SEC, which is
11503 a section we've decided to keep. Return the section that contains
11504 the relocation symbol, or NULL if no section contains it. */
11507 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11508 elf_gc_mark_hook_fn gc_mark_hook
,
11509 struct elf_reloc_cookie
*cookie
)
11511 unsigned long r_symndx
;
11512 struct elf_link_hash_entry
*h
;
11514 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11515 if (r_symndx
== STN_UNDEF
)
11518 if (r_symndx
>= cookie
->locsymcount
11519 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11521 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11522 while (h
->root
.type
== bfd_link_hash_indirect
11523 || h
->root
.type
== bfd_link_hash_warning
)
11524 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11525 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11528 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11529 &cookie
->locsyms
[r_symndx
]);
11532 /* COOKIE->rel describes a relocation against section SEC, which is
11533 a section we've decided to keep. Mark the section that contains
11534 the relocation symbol. */
11537 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11539 elf_gc_mark_hook_fn gc_mark_hook
,
11540 struct elf_reloc_cookie
*cookie
)
11544 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11545 if (rsec
&& !rsec
->gc_mark
)
11547 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11549 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11555 /* The mark phase of garbage collection. For a given section, mark
11556 it and any sections in this section's group, and all the sections
11557 which define symbols to which it refers. */
11560 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11562 elf_gc_mark_hook_fn gc_mark_hook
)
11565 asection
*group_sec
, *eh_frame
;
11569 /* Mark all the sections in the group. */
11570 group_sec
= elf_section_data (sec
)->next_in_group
;
11571 if (group_sec
&& !group_sec
->gc_mark
)
11572 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11575 /* Look through the section relocs. */
11577 eh_frame
= elf_eh_frame_section (sec
->owner
);
11578 if ((sec
->flags
& SEC_RELOC
) != 0
11579 && sec
->reloc_count
> 0
11580 && sec
!= eh_frame
)
11582 struct elf_reloc_cookie cookie
;
11584 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11588 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11589 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11594 fini_reloc_cookie_for_section (&cookie
, sec
);
11598 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11600 struct elf_reloc_cookie cookie
;
11602 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11606 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11607 gc_mark_hook
, &cookie
))
11609 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11616 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11618 struct elf_gc_sweep_symbol_info
11620 struct bfd_link_info
*info
;
11621 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11626 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11628 if (h
->root
.type
== bfd_link_hash_warning
)
11629 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11631 if ((h
->root
.type
== bfd_link_hash_defined
11632 || h
->root
.type
== bfd_link_hash_defweak
)
11633 && !h
->root
.u
.def
.section
->gc_mark
11634 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11636 struct elf_gc_sweep_symbol_info
*inf
=
11637 (struct elf_gc_sweep_symbol_info
*) data
;
11638 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11644 /* The sweep phase of garbage collection. Remove all garbage sections. */
11646 typedef bfd_boolean (*gc_sweep_hook_fn
)
11647 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11650 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11653 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11654 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11655 unsigned long section_sym_count
;
11656 struct elf_gc_sweep_symbol_info sweep_info
;
11658 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11662 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11665 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11667 /* When any section in a section group is kept, we keep all
11668 sections in the section group. If the first member of
11669 the section group is excluded, we will also exclude the
11671 if (o
->flags
& SEC_GROUP
)
11673 asection
*first
= elf_next_in_group (o
);
11674 o
->gc_mark
= first
->gc_mark
;
11676 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11677 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0
11678 || elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
)
11680 /* Keep debug, special and SHT_NOTE sections. */
11687 /* Skip sweeping sections already excluded. */
11688 if (o
->flags
& SEC_EXCLUDE
)
11691 /* Since this is early in the link process, it is simple
11692 to remove a section from the output. */
11693 o
->flags
|= SEC_EXCLUDE
;
11695 if (info
->print_gc_sections
&& o
->size
!= 0)
11696 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11698 /* But we also have to update some of the relocation
11699 info we collected before. */
11701 && (o
->flags
& SEC_RELOC
) != 0
11702 && o
->reloc_count
> 0
11703 && !bfd_is_abs_section (o
->output_section
))
11705 Elf_Internal_Rela
*internal_relocs
;
11709 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11710 info
->keep_memory
);
11711 if (internal_relocs
== NULL
)
11714 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11716 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11717 free (internal_relocs
);
11725 /* Remove the symbols that were in the swept sections from the dynamic
11726 symbol table. GCFIXME: Anyone know how to get them out of the
11727 static symbol table as well? */
11728 sweep_info
.info
= info
;
11729 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11730 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11733 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11737 /* Propagate collected vtable information. This is called through
11738 elf_link_hash_traverse. */
11741 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11743 if (h
->root
.type
== bfd_link_hash_warning
)
11744 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11746 /* Those that are not vtables. */
11747 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11750 /* Those vtables that do not have parents, we cannot merge. */
11751 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11754 /* If we've already been done, exit. */
11755 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11758 /* Make sure the parent's table is up to date. */
11759 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11761 if (h
->vtable
->used
== NULL
)
11763 /* None of this table's entries were referenced. Re-use the
11765 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11766 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11771 bfd_boolean
*cu
, *pu
;
11773 /* Or the parent's entries into ours. */
11774 cu
= h
->vtable
->used
;
11776 pu
= h
->vtable
->parent
->vtable
->used
;
11779 const struct elf_backend_data
*bed
;
11780 unsigned int log_file_align
;
11782 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11783 log_file_align
= bed
->s
->log_file_align
;
11784 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11799 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11802 bfd_vma hstart
, hend
;
11803 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11804 const struct elf_backend_data
*bed
;
11805 unsigned int log_file_align
;
11807 if (h
->root
.type
== bfd_link_hash_warning
)
11808 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11810 /* Take care of both those symbols that do not describe vtables as
11811 well as those that are not loaded. */
11812 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11815 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11816 || h
->root
.type
== bfd_link_hash_defweak
);
11818 sec
= h
->root
.u
.def
.section
;
11819 hstart
= h
->root
.u
.def
.value
;
11820 hend
= hstart
+ h
->size
;
11822 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11824 return *(bfd_boolean
*) okp
= FALSE
;
11825 bed
= get_elf_backend_data (sec
->owner
);
11826 log_file_align
= bed
->s
->log_file_align
;
11828 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11830 for (rel
= relstart
; rel
< relend
; ++rel
)
11831 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11833 /* If the entry is in use, do nothing. */
11834 if (h
->vtable
->used
11835 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11837 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11838 if (h
->vtable
->used
[entry
])
11841 /* Otherwise, kill it. */
11842 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11848 /* Mark sections containing dynamically referenced symbols. When
11849 building shared libraries, we must assume that any visible symbol is
11853 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11855 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11857 if (h
->root
.type
== bfd_link_hash_warning
)
11858 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11860 if ((h
->root
.type
== bfd_link_hash_defined
11861 || h
->root
.type
== bfd_link_hash_defweak
)
11863 || (!info
->executable
11865 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11866 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11867 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11872 /* Keep all sections containing symbols undefined on the command-line,
11873 and the section containing the entry symbol. */
11876 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11878 struct bfd_sym_chain
*sym
;
11880 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11882 struct elf_link_hash_entry
*h
;
11884 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11885 FALSE
, FALSE
, FALSE
);
11888 && (h
->root
.type
== bfd_link_hash_defined
11889 || h
->root
.type
== bfd_link_hash_defweak
)
11890 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11891 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11895 /* Do mark and sweep of unused sections. */
11898 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11900 bfd_boolean ok
= TRUE
;
11902 elf_gc_mark_hook_fn gc_mark_hook
;
11903 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11905 if (!bed
->can_gc_sections
11906 || !is_elf_hash_table (info
->hash
))
11908 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11912 bed
->gc_keep (info
);
11914 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11915 at the .eh_frame section if we can mark the FDEs individually. */
11916 _bfd_elf_begin_eh_frame_parsing (info
);
11917 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11920 struct elf_reloc_cookie cookie
;
11922 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11923 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11925 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11926 if (elf_section_data (sec
)->sec_info
)
11927 elf_eh_frame_section (sub
) = sec
;
11928 fini_reloc_cookie_for_section (&cookie
, sec
);
11931 _bfd_elf_end_eh_frame_parsing (info
);
11933 /* Apply transitive closure to the vtable entry usage info. */
11934 elf_link_hash_traverse (elf_hash_table (info
),
11935 elf_gc_propagate_vtable_entries_used
,
11940 /* Kill the vtable relocations that were not used. */
11941 elf_link_hash_traverse (elf_hash_table (info
),
11942 elf_gc_smash_unused_vtentry_relocs
,
11947 /* Mark dynamically referenced symbols. */
11948 if (elf_hash_table (info
)->dynamic_sections_created
)
11949 elf_link_hash_traverse (elf_hash_table (info
),
11950 bed
->gc_mark_dynamic_ref
,
11953 /* Grovel through relocs to find out who stays ... */
11954 gc_mark_hook
= bed
->gc_mark_hook
;
11955 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11959 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11962 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11963 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11964 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11968 /* Allow the backend to mark additional target specific sections. */
11969 if (bed
->gc_mark_extra_sections
)
11970 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11972 /* ... and mark SEC_EXCLUDE for those that go. */
11973 return elf_gc_sweep (abfd
, info
);
11976 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11979 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11981 struct elf_link_hash_entry
*h
,
11984 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11985 struct elf_link_hash_entry
**search
, *child
;
11986 bfd_size_type extsymcount
;
11987 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11989 /* The sh_info field of the symtab header tells us where the
11990 external symbols start. We don't care about the local symbols at
11992 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11993 if (!elf_bad_symtab (abfd
))
11994 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11996 sym_hashes
= elf_sym_hashes (abfd
);
11997 sym_hashes_end
= sym_hashes
+ extsymcount
;
11999 /* Hunt down the child symbol, which is in this section at the same
12000 offset as the relocation. */
12001 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
12003 if ((child
= *search
) != NULL
12004 && (child
->root
.type
== bfd_link_hash_defined
12005 || child
->root
.type
== bfd_link_hash_defweak
)
12006 && child
->root
.u
.def
.section
== sec
12007 && child
->root
.u
.def
.value
== offset
)
12011 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
12012 abfd
, sec
, (unsigned long) offset
);
12013 bfd_set_error (bfd_error_invalid_operation
);
12017 if (!child
->vtable
)
12019 child
->vtable
= (struct elf_link_virtual_table_entry
*)
12020 bfd_zalloc (abfd
, sizeof (*child
->vtable
));
12021 if (!child
->vtable
)
12026 /* This *should* only be the absolute section. It could potentially
12027 be that someone has defined a non-global vtable though, which
12028 would be bad. It isn't worth paging in the local symbols to be
12029 sure though; that case should simply be handled by the assembler. */
12031 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
12034 child
->vtable
->parent
= h
;
12039 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12042 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
12043 asection
*sec ATTRIBUTE_UNUSED
,
12044 struct elf_link_hash_entry
*h
,
12047 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12048 unsigned int log_file_align
= bed
->s
->log_file_align
;
12052 h
->vtable
= (struct elf_link_virtual_table_entry
*)
12053 bfd_zalloc (abfd
, sizeof (*h
->vtable
));
12058 if (addend
>= h
->vtable
->size
)
12060 size_t size
, bytes
, file_align
;
12061 bfd_boolean
*ptr
= h
->vtable
->used
;
12063 /* While the symbol is undefined, we have to be prepared to handle
12065 file_align
= 1 << log_file_align
;
12066 if (h
->root
.type
== bfd_link_hash_undefined
)
12067 size
= addend
+ file_align
;
12071 if (addend
>= size
)
12073 /* Oops! We've got a reference past the defined end of
12074 the table. This is probably a bug -- shall we warn? */
12075 size
= addend
+ file_align
;
12078 size
= (size
+ file_align
- 1) & -file_align
;
12080 /* Allocate one extra entry for use as a "done" flag for the
12081 consolidation pass. */
12082 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
12086 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
12092 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
12093 * sizeof (bfd_boolean
));
12094 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
12098 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
12103 /* And arrange for that done flag to be at index -1. */
12104 h
->vtable
->used
= ptr
+ 1;
12105 h
->vtable
->size
= size
;
12108 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
12113 struct alloc_got_off_arg
{
12115 struct bfd_link_info
*info
;
12118 /* We need a special top-level link routine to convert got reference counts
12119 to real got offsets. */
12122 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
12124 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
12125 bfd
*obfd
= gofarg
->info
->output_bfd
;
12126 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12128 if (h
->root
.type
== bfd_link_hash_warning
)
12129 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12131 if (h
->got
.refcount
> 0)
12133 h
->got
.offset
= gofarg
->gotoff
;
12134 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
12137 h
->got
.offset
= (bfd_vma
) -1;
12142 /* And an accompanying bit to work out final got entry offsets once
12143 we're done. Should be called from final_link. */
12146 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
12147 struct bfd_link_info
*info
)
12150 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12152 struct alloc_got_off_arg gofarg
;
12154 BFD_ASSERT (abfd
== info
->output_bfd
);
12156 if (! is_elf_hash_table (info
->hash
))
12159 /* The GOT offset is relative to the .got section, but the GOT header is
12160 put into the .got.plt section, if the backend uses it. */
12161 if (bed
->want_got_plt
)
12164 gotoff
= bed
->got_header_size
;
12166 /* Do the local .got entries first. */
12167 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
12169 bfd_signed_vma
*local_got
;
12170 bfd_size_type j
, locsymcount
;
12171 Elf_Internal_Shdr
*symtab_hdr
;
12173 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
12176 local_got
= elf_local_got_refcounts (i
);
12180 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
12181 if (elf_bad_symtab (i
))
12182 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12184 locsymcount
= symtab_hdr
->sh_info
;
12186 for (j
= 0; j
< locsymcount
; ++j
)
12188 if (local_got
[j
] > 0)
12190 local_got
[j
] = gotoff
;
12191 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
12194 local_got
[j
] = (bfd_vma
) -1;
12198 /* Then the global .got entries. .plt refcounts are handled by
12199 adjust_dynamic_symbol */
12200 gofarg
.gotoff
= gotoff
;
12201 gofarg
.info
= info
;
12202 elf_link_hash_traverse (elf_hash_table (info
),
12203 elf_gc_allocate_got_offsets
,
12208 /* Many folk need no more in the way of final link than this, once
12209 got entry reference counting is enabled. */
12212 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12214 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12217 /* Invoke the regular ELF backend linker to do all the work. */
12218 return bfd_elf_final_link (abfd
, info
);
12222 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12224 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
12226 if (rcookie
->bad_symtab
)
12227 rcookie
->rel
= rcookie
->rels
;
12229 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12231 unsigned long r_symndx
;
12233 if (! rcookie
->bad_symtab
)
12234 if (rcookie
->rel
->r_offset
> offset
)
12236 if (rcookie
->rel
->r_offset
!= offset
)
12239 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12240 if (r_symndx
== STN_UNDEF
)
12243 if (r_symndx
>= rcookie
->locsymcount
12244 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12246 struct elf_link_hash_entry
*h
;
12248 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12250 while (h
->root
.type
== bfd_link_hash_indirect
12251 || h
->root
.type
== bfd_link_hash_warning
)
12252 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12254 if ((h
->root
.type
== bfd_link_hash_defined
12255 || h
->root
.type
== bfd_link_hash_defweak
)
12256 && elf_discarded_section (h
->root
.u
.def
.section
))
12263 /* It's not a relocation against a global symbol,
12264 but it could be a relocation against a local
12265 symbol for a discarded section. */
12267 Elf_Internal_Sym
*isym
;
12269 /* Need to: get the symbol; get the section. */
12270 isym
= &rcookie
->locsyms
[r_symndx
];
12271 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12272 if (isec
!= NULL
&& elf_discarded_section (isec
))
12280 /* Discard unneeded references to discarded sections.
12281 Returns TRUE if any section's size was changed. */
12282 /* This function assumes that the relocations are in sorted order,
12283 which is true for all known assemblers. */
12286 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12288 struct elf_reloc_cookie cookie
;
12289 asection
*stab
, *eh
;
12290 const struct elf_backend_data
*bed
;
12292 bfd_boolean ret
= FALSE
;
12294 if (info
->traditional_format
12295 || !is_elf_hash_table (info
->hash
))
12298 _bfd_elf_begin_eh_frame_parsing (info
);
12299 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12301 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12304 bed
= get_elf_backend_data (abfd
);
12306 if ((abfd
->flags
& DYNAMIC
) != 0)
12310 if (!info
->relocatable
)
12312 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12315 || bfd_is_abs_section (eh
->output_section
)))
12319 stab
= bfd_get_section_by_name (abfd
, ".stab");
12321 && (stab
->size
== 0
12322 || bfd_is_abs_section (stab
->output_section
)
12323 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12328 && bed
->elf_backend_discard_info
== NULL
)
12331 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12335 && stab
->reloc_count
> 0
12336 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12338 if (_bfd_discard_section_stabs (abfd
, stab
,
12339 elf_section_data (stab
)->sec_info
,
12340 bfd_elf_reloc_symbol_deleted_p
,
12343 fini_reloc_cookie_rels (&cookie
, stab
);
12347 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12349 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12350 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12351 bfd_elf_reloc_symbol_deleted_p
,
12354 fini_reloc_cookie_rels (&cookie
, eh
);
12357 if (bed
->elf_backend_discard_info
!= NULL
12358 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12361 fini_reloc_cookie (&cookie
, abfd
);
12363 _bfd_elf_end_eh_frame_parsing (info
);
12365 if (info
->eh_frame_hdr
12366 && !info
->relocatable
12367 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12373 /* For a SHT_GROUP section, return the group signature. For other
12374 sections, return the normal section name. */
12376 static const char *
12377 section_signature (asection
*sec
)
12379 if ((sec
->flags
& SEC_GROUP
) != 0
12380 && elf_next_in_group (sec
) != NULL
12381 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12382 return elf_group_name (elf_next_in_group (sec
));
12387 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12388 struct bfd_link_info
*info
)
12391 const char *name
, *p
;
12392 struct bfd_section_already_linked
*l
;
12393 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12395 if (sec
->output_section
== bfd_abs_section_ptr
)
12398 flags
= sec
->flags
;
12400 /* Return if it isn't a linkonce section. A comdat group section
12401 also has SEC_LINK_ONCE set. */
12402 if ((flags
& SEC_LINK_ONCE
) == 0)
12405 /* Don't put group member sections on our list of already linked
12406 sections. They are handled as a group via their group section. */
12407 if (elf_sec_group (sec
) != NULL
)
12410 /* FIXME: When doing a relocatable link, we may have trouble
12411 copying relocations in other sections that refer to local symbols
12412 in the section being discarded. Those relocations will have to
12413 be converted somehow; as of this writing I'm not sure that any of
12414 the backends handle that correctly.
12416 It is tempting to instead not discard link once sections when
12417 doing a relocatable link (technically, they should be discarded
12418 whenever we are building constructors). However, that fails,
12419 because the linker winds up combining all the link once sections
12420 into a single large link once section, which defeats the purpose
12421 of having link once sections in the first place.
12423 Also, not merging link once sections in a relocatable link
12424 causes trouble for MIPS ELF, which relies on link once semantics
12425 to handle the .reginfo section correctly. */
12427 name
= section_signature (sec
);
12429 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12430 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12435 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12437 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12439 /* We may have 2 different types of sections on the list: group
12440 sections and linkonce sections. Match like sections. */
12441 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12442 && strcmp (name
, section_signature (l
->sec
)) == 0
12443 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12445 /* The section has already been linked. See if we should
12446 issue a warning. */
12447 switch (flags
& SEC_LINK_DUPLICATES
)
12452 case SEC_LINK_DUPLICATES_DISCARD
:
12455 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12456 (*_bfd_error_handler
)
12457 (_("%B: ignoring duplicate section `%A'"),
12461 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12462 if (sec
->size
!= l
->sec
->size
)
12463 (*_bfd_error_handler
)
12464 (_("%B: duplicate section `%A' has different size"),
12468 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12469 if (sec
->size
!= l
->sec
->size
)
12470 (*_bfd_error_handler
)
12471 (_("%B: duplicate section `%A' has different size"),
12473 else if (sec
->size
!= 0)
12475 bfd_byte
*sec_contents
, *l_sec_contents
;
12477 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12478 (*_bfd_error_handler
)
12479 (_("%B: warning: could not read contents of section `%A'"),
12481 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12483 (*_bfd_error_handler
)
12484 (_("%B: warning: could not read contents of section `%A'"),
12485 l
->sec
->owner
, l
->sec
);
12486 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12487 (*_bfd_error_handler
)
12488 (_("%B: warning: duplicate section `%A' has different contents"),
12492 free (sec_contents
);
12493 if (l_sec_contents
)
12494 free (l_sec_contents
);
12499 /* Set the output_section field so that lang_add_section
12500 does not create a lang_input_section structure for this
12501 section. Since there might be a symbol in the section
12502 being discarded, we must retain a pointer to the section
12503 which we are really going to use. */
12504 sec
->output_section
= bfd_abs_section_ptr
;
12505 sec
->kept_section
= l
->sec
;
12507 if (flags
& SEC_GROUP
)
12509 asection
*first
= elf_next_in_group (sec
);
12510 asection
*s
= first
;
12514 s
->output_section
= bfd_abs_section_ptr
;
12515 /* Record which group discards it. */
12516 s
->kept_section
= l
->sec
;
12517 s
= elf_next_in_group (s
);
12518 /* These lists are circular. */
12528 /* A single member comdat group section may be discarded by a
12529 linkonce section and vice versa. */
12531 if ((flags
& SEC_GROUP
) != 0)
12533 asection
*first
= elf_next_in_group (sec
);
12535 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12536 /* Check this single member group against linkonce sections. */
12537 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12538 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12539 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12540 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12542 first
->output_section
= bfd_abs_section_ptr
;
12543 first
->kept_section
= l
->sec
;
12544 sec
->output_section
= bfd_abs_section_ptr
;
12549 /* Check this linkonce section against single member groups. */
12550 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12551 if (l
->sec
->flags
& SEC_GROUP
)
12553 asection
*first
= elf_next_in_group (l
->sec
);
12556 && elf_next_in_group (first
) == first
12557 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12559 sec
->output_section
= bfd_abs_section_ptr
;
12560 sec
->kept_section
= first
;
12565 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12566 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12567 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12568 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12569 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12570 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12571 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12572 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12573 The reverse order cannot happen as there is never a bfd with only the
12574 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12575 matter as here were are looking only for cross-bfd sections. */
12577 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12578 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12579 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12580 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12582 if (abfd
!= l
->sec
->owner
)
12583 sec
->output_section
= bfd_abs_section_ptr
;
12587 /* This is the first section with this name. Record it. */
12588 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12589 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12593 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12595 return sym
->st_shndx
== SHN_COMMON
;
12599 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12605 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12607 return bfd_com_section_ptr
;
12611 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12612 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12613 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12614 bfd
*ibfd ATTRIBUTE_UNUSED
,
12615 unsigned long symndx ATTRIBUTE_UNUSED
)
12617 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12618 return bed
->s
->arch_size
/ 8;
12621 /* Routines to support the creation of dynamic relocs. */
12623 /* Returns the name of the dynamic reloc section associated with SEC. */
12625 static const char *
12626 get_dynamic_reloc_section_name (bfd
* abfd
,
12628 bfd_boolean is_rela
)
12631 const char *old_name
= bfd_get_section_name (NULL
, sec
);
12632 const char *prefix
= is_rela
? ".rela" : ".rel";
12634 if (old_name
== NULL
)
12637 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
12638 sprintf (name
, "%s%s", prefix
, old_name
);
12643 /* Returns the dynamic reloc section associated with SEC.
12644 If necessary compute the name of the dynamic reloc section based
12645 on SEC's name (looked up in ABFD's string table) and the setting
12649 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12651 bfd_boolean is_rela
)
12653 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12655 if (reloc_sec
== NULL
)
12657 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12661 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12663 if (reloc_sec
!= NULL
)
12664 elf_section_data (sec
)->sreloc
= reloc_sec
;
12671 /* Returns the dynamic reloc section associated with SEC. If the
12672 section does not exist it is created and attached to the DYNOBJ
12673 bfd and stored in the SRELOC field of SEC's elf_section_data
12676 ALIGNMENT is the alignment for the newly created section and
12677 IS_RELA defines whether the name should be .rela.<SEC's name>
12678 or .rel.<SEC's name>. The section name is looked up in the
12679 string table associated with ABFD. */
12682 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12684 unsigned int alignment
,
12686 bfd_boolean is_rela
)
12688 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12690 if (reloc_sec
== NULL
)
12692 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12697 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12699 if (reloc_sec
== NULL
)
12703 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12704 if ((sec
->flags
& SEC_ALLOC
) != 0)
12705 flags
|= SEC_ALLOC
| SEC_LOAD
;
12707 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12708 if (reloc_sec
!= NULL
)
12710 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12715 elf_section_data (sec
)->sreloc
= reloc_sec
;
12721 /* Copy the ELF symbol type associated with a linker hash entry. */
12723 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd ATTRIBUTE_UNUSED
,
12724 struct bfd_link_hash_entry
* hdest
,
12725 struct bfd_link_hash_entry
* hsrc
)
12727 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*)hdest
;
12728 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*)hsrc
;
12730 ehdest
->type
= ehsrc
->type
;
12731 ehdest
->target_internal
= ehsrc
->target_internal
;
12734 /* Append a RELA relocation REL to section S in BFD. */
12737 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
12739 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12740 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
12741 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
12742 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
12745 /* Append a REL relocation REL to section S in BFD. */
12748 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
12750 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12751 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
12752 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
12753 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);