1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
35 struct elf_link_hash_entry
*h
;
36 struct bfd_link_hash_entry
*bh
;
37 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
40 /* This function may be called more than once. */
41 s
= bfd_get_section_by_name (abfd
, ".got");
42 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
45 switch (bed
->s
->arch_size
)
56 bfd_set_error (bfd_error_bad_value
);
60 flags
= bed
->dynamic_sec_flags
;
62 s
= bfd_make_section (abfd
, ".got");
64 || !bfd_set_section_flags (abfd
, s
, flags
)
65 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
68 if (bed
->want_got_plt
)
70 s
= bfd_make_section (abfd
, ".got.plt");
72 || !bfd_set_section_flags (abfd
, s
, flags
)
73 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
77 if (bed
->want_got_sym
)
79 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
80 (or .got.plt) section. We don't do this in the linker script
81 because we don't want to define the symbol if we are not creating
82 a global offset table. */
84 if (!(_bfd_generic_link_add_one_symbol
85 (info
, abfd
, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL
, s
,
86 bed
->got_symbol_offset
, NULL
, FALSE
, bed
->collect
, &bh
)))
88 h
= (struct elf_link_hash_entry
*) bh
;
91 h
->other
= STV_HIDDEN
;
93 if (! info
->executable
94 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
97 elf_hash_table (info
)->hgot
= h
;
100 /* The first bit of the global offset table is the header. */
101 s
->size
+= bed
->got_header_size
+ bed
->got_symbol_offset
;
106 /* Create a strtab to hold the dynamic symbol names. */
108 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
110 struct elf_link_hash_table
*hash_table
;
112 hash_table
= elf_hash_table (info
);
113 if (hash_table
->dynobj
== NULL
)
114 hash_table
->dynobj
= abfd
;
116 if (hash_table
->dynstr
== NULL
)
118 hash_table
->dynstr
= _bfd_elf_strtab_init ();
119 if (hash_table
->dynstr
== NULL
)
125 /* Create some sections which will be filled in with dynamic linking
126 information. ABFD is an input file which requires dynamic sections
127 to be created. The dynamic sections take up virtual memory space
128 when the final executable is run, so we need to create them before
129 addresses are assigned to the output sections. We work out the
130 actual contents and size of these sections later. */
133 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
136 register asection
*s
;
137 struct elf_link_hash_entry
*h
;
138 struct bfd_link_hash_entry
*bh
;
139 const struct elf_backend_data
*bed
;
141 if (! is_elf_hash_table (info
->hash
))
144 if (elf_hash_table (info
)->dynamic_sections_created
)
147 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
150 abfd
= elf_hash_table (info
)->dynobj
;
151 bed
= get_elf_backend_data (abfd
);
153 flags
= bed
->dynamic_sec_flags
;
155 /* A dynamically linked executable has a .interp section, but a
156 shared library does not. */
157 if (info
->executable
)
159 s
= bfd_make_section (abfd
, ".interp");
161 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
165 if (! info
->traditional_format
)
167 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
169 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
170 || ! bfd_set_section_alignment (abfd
, s
, 2))
172 elf_hash_table (info
)->eh_info
.hdr_sec
= s
;
175 /* Create sections to hold version informations. These are removed
176 if they are not needed. */
177 s
= bfd_make_section (abfd
, ".gnu.version_d");
179 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
180 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
183 s
= bfd_make_section (abfd
, ".gnu.version");
185 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
186 || ! bfd_set_section_alignment (abfd
, s
, 1))
189 s
= bfd_make_section (abfd
, ".gnu.version_r");
191 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
192 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
195 s
= bfd_make_section (abfd
, ".dynsym");
197 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
198 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
201 s
= bfd_make_section (abfd
, ".dynstr");
203 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
206 s
= bfd_make_section (abfd
, ".dynamic");
208 || ! bfd_set_section_flags (abfd
, s
, flags
)
209 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
212 /* The special symbol _DYNAMIC is always set to the start of the
213 .dynamic section. We could set _DYNAMIC in a linker script, but we
214 only want to define it if we are, in fact, creating a .dynamic
215 section. We don't want to define it if there is no .dynamic
216 section, since on some ELF platforms the start up code examines it
217 to decide how to initialize the process. */
218 h
= elf_link_hash_lookup (elf_hash_table (info
), "_DYNAMIC",
219 FALSE
, FALSE
, FALSE
);
222 /* Zap symbol defined in an as-needed lib that wasn't linked.
223 This is a symptom of a larger problem: Absolute symbols
224 defined in shared libraries can't be overridden, because we
225 lose the link to the bfd which is via the symbol section. */
226 h
->root
.type
= bfd_link_hash_new
;
229 if (! (_bfd_generic_link_add_one_symbol
230 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, 0, NULL
, FALSE
,
231 get_elf_backend_data (abfd
)->collect
, &bh
)))
233 h
= (struct elf_link_hash_entry
*) bh
;
235 h
->type
= STT_OBJECT
;
237 if (! info
->executable
238 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
241 s
= bfd_make_section (abfd
, ".hash");
243 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
244 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
246 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
248 /* Let the backend create the rest of the sections. This lets the
249 backend set the right flags. The backend will normally create
250 the .got and .plt sections. */
251 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
254 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
259 /* Create dynamic sections when linking against a dynamic object. */
262 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
264 flagword flags
, pltflags
;
266 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
268 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
269 .rel[a].bss sections. */
270 flags
= bed
->dynamic_sec_flags
;
273 if (bed
->plt_not_loaded
)
274 /* We do not clear SEC_ALLOC here because we still want the OS to
275 allocate space for the section; it's just that there's nothing
276 to read in from the object file. */
277 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
279 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
280 if (bed
->plt_readonly
)
281 pltflags
|= SEC_READONLY
;
283 s
= bfd_make_section (abfd
, ".plt");
285 || ! bfd_set_section_flags (abfd
, s
, pltflags
)
286 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
289 if (bed
->want_plt_sym
)
291 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
293 struct elf_link_hash_entry
*h
;
294 struct bfd_link_hash_entry
*bh
= NULL
;
296 if (! (_bfd_generic_link_add_one_symbol
297 (info
, abfd
, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL
, s
, 0, NULL
,
298 FALSE
, get_elf_backend_data (abfd
)->collect
, &bh
)))
300 h
= (struct elf_link_hash_entry
*) bh
;
302 h
->type
= STT_OBJECT
;
304 if (! info
->executable
305 && ! bfd_elf_link_record_dynamic_symbol (info
, h
))
309 s
= bfd_make_section (abfd
,
310 bed
->default_use_rela_p
? ".rela.plt" : ".rel.plt");
312 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
313 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
316 if (! _bfd_elf_create_got_section (abfd
, info
))
319 if (bed
->want_dynbss
)
321 /* The .dynbss section is a place to put symbols which are defined
322 by dynamic objects, are referenced by regular objects, and are
323 not functions. We must allocate space for them in the process
324 image and use a R_*_COPY reloc to tell the dynamic linker to
325 initialize them at run time. The linker script puts the .dynbss
326 section into the .bss section of the final image. */
327 s
= bfd_make_section (abfd
, ".dynbss");
329 || ! bfd_set_section_flags (abfd
, s
, SEC_ALLOC
| SEC_LINKER_CREATED
))
332 /* The .rel[a].bss section holds copy relocs. This section is not
333 normally needed. We need to create it here, though, so that the
334 linker will map it to an output section. We can't just create it
335 only if we need it, because we will not know whether we need it
336 until we have seen all the input files, and the first time the
337 main linker code calls BFD after examining all the input files
338 (size_dynamic_sections) the input sections have already been
339 mapped to the output sections. If the section turns out not to
340 be needed, we can discard it later. We will never need this
341 section when generating a shared object, since they do not use
345 s
= bfd_make_section (abfd
,
346 (bed
->default_use_rela_p
347 ? ".rela.bss" : ".rel.bss"));
349 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
350 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
358 /* Record a new dynamic symbol. We record the dynamic symbols as we
359 read the input files, since we need to have a list of all of them
360 before we can determine the final sizes of the output sections.
361 Note that we may actually call this function even though we are not
362 going to output any dynamic symbols; in some cases we know that a
363 symbol should be in the dynamic symbol table, but only if there is
367 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
368 struct elf_link_hash_entry
*h
)
370 if (h
->dynindx
== -1)
372 struct elf_strtab_hash
*dynstr
;
377 /* XXX: The ABI draft says the linker must turn hidden and
378 internal symbols into STB_LOCAL symbols when producing the
379 DSO. However, if ld.so honors st_other in the dynamic table,
380 this would not be necessary. */
381 switch (ELF_ST_VISIBILITY (h
->other
))
385 if (h
->root
.type
!= bfd_link_hash_undefined
386 && h
->root
.type
!= bfd_link_hash_undefweak
)
396 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
397 ++elf_hash_table (info
)->dynsymcount
;
399 dynstr
= elf_hash_table (info
)->dynstr
;
402 /* Create a strtab to hold the dynamic symbol names. */
403 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
408 /* We don't put any version information in the dynamic string
410 name
= h
->root
.root
.string
;
411 p
= strchr (name
, ELF_VER_CHR
);
413 /* We know that the p points into writable memory. In fact,
414 there are only a few symbols that have read-only names, being
415 those like _GLOBAL_OFFSET_TABLE_ that are created specially
416 by the backends. Most symbols will have names pointing into
417 an ELF string table read from a file, or to objalloc memory. */
420 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
425 if (indx
== (bfd_size_type
) -1)
427 h
->dynstr_index
= indx
;
433 /* Record an assignment to a symbol made by a linker script. We need
434 this in case some dynamic object refers to this symbol. */
437 bfd_elf_record_link_assignment (bfd
*output_bfd ATTRIBUTE_UNUSED
,
438 struct bfd_link_info
*info
,
442 struct elf_link_hash_entry
*h
;
443 struct elf_link_hash_table
*htab
;
445 if (!is_elf_hash_table (info
->hash
))
448 htab
= elf_hash_table (info
);
449 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
453 /* Since we're defining the symbol, don't let it seem to have not
454 been defined. record_dynamic_symbol and size_dynamic_sections
455 may depend on this. */
456 if (h
->root
.type
== bfd_link_hash_undefweak
457 || h
->root
.type
== bfd_link_hash_undefined
)
459 h
->root
.type
= bfd_link_hash_new
;
460 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
461 bfd_link_repair_undef_list (&htab
->root
);
464 if (h
->root
.type
== bfd_link_hash_new
)
467 /* If this symbol is being provided by the linker script, and it is
468 currently defined by a dynamic object, but not by a regular
469 object, then mark it as undefined so that the generic linker will
470 force the correct value. */
474 h
->root
.type
= bfd_link_hash_undefined
;
476 /* If this symbol is not being provided by the linker script, and it is
477 currently defined by a dynamic object, but not by a regular object,
478 then clear out any version information because the symbol will not be
479 associated with the dynamic object any more. */
483 h
->verinfo
.verdef
= NULL
;
492 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
495 /* If this is a weak defined symbol, and we know a corresponding
496 real symbol from the same dynamic object, make sure the real
497 symbol is also made into a dynamic symbol. */
498 if (h
->u
.weakdef
!= NULL
499 && h
->u
.weakdef
->dynindx
== -1)
501 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
509 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
510 success, and 2 on a failure caused by attempting to record a symbol
511 in a discarded section, eg. a discarded link-once section symbol. */
514 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
519 struct elf_link_local_dynamic_entry
*entry
;
520 struct elf_link_hash_table
*eht
;
521 struct elf_strtab_hash
*dynstr
;
522 unsigned long dynstr_index
;
524 Elf_External_Sym_Shndx eshndx
;
525 char esym
[sizeof (Elf64_External_Sym
)];
527 if (! is_elf_hash_table (info
->hash
))
530 /* See if the entry exists already. */
531 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
532 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
535 amt
= sizeof (*entry
);
536 entry
= bfd_alloc (input_bfd
, amt
);
540 /* Go find the symbol, so that we can find it's name. */
541 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
542 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
544 bfd_release (input_bfd
, entry
);
548 if (entry
->isym
.st_shndx
!= SHN_UNDEF
549 && (entry
->isym
.st_shndx
< SHN_LORESERVE
550 || entry
->isym
.st_shndx
> SHN_HIRESERVE
))
554 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
555 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
557 /* We can still bfd_release here as nothing has done another
558 bfd_alloc. We can't do this later in this function. */
559 bfd_release (input_bfd
, entry
);
564 name
= (bfd_elf_string_from_elf_section
565 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
566 entry
->isym
.st_name
));
568 dynstr
= elf_hash_table (info
)->dynstr
;
571 /* Create a strtab to hold the dynamic symbol names. */
572 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
577 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
578 if (dynstr_index
== (unsigned long) -1)
580 entry
->isym
.st_name
= dynstr_index
;
582 eht
= elf_hash_table (info
);
584 entry
->next
= eht
->dynlocal
;
585 eht
->dynlocal
= entry
;
586 entry
->input_bfd
= input_bfd
;
587 entry
->input_indx
= input_indx
;
590 /* Whatever binding the symbol had before, it's now local. */
592 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
594 /* The dynindx will be set at the end of size_dynamic_sections. */
599 /* Return the dynindex of a local dynamic symbol. */
602 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
606 struct elf_link_local_dynamic_entry
*e
;
608 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
609 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
614 /* This function is used to renumber the dynamic symbols, if some of
615 them are removed because they are marked as local. This is called
616 via elf_link_hash_traverse. */
619 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
622 size_t *count
= data
;
624 if (h
->root
.type
== bfd_link_hash_warning
)
625 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
627 if (h
->dynindx
!= -1)
628 h
->dynindx
= ++(*count
);
633 /* Return true if the dynamic symbol for a given section should be
634 omitted when creating a shared library. */
636 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
637 struct bfd_link_info
*info
,
640 switch (elf_section_data (p
)->this_hdr
.sh_type
)
644 /* If sh_type is yet undecided, assume it could be
645 SHT_PROGBITS/SHT_NOBITS. */
647 if (strcmp (p
->name
, ".got") == 0
648 || strcmp (p
->name
, ".got.plt") == 0
649 || strcmp (p
->name
, ".plt") == 0)
652 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
655 && (ip
= bfd_get_section_by_name (dynobj
, p
->name
)) != NULL
656 && (ip
->flags
& SEC_LINKER_CREATED
)
657 && ip
->output_section
== p
)
662 /* There shouldn't be section relative relocations
663 against any other section. */
669 /* Assign dynsym indices. In a shared library we generate a section
670 symbol for each output section, which come first. Next come all of
671 the back-end allocated local dynamic syms, followed by the rest of
672 the global symbols. */
675 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
, struct bfd_link_info
*info
)
677 unsigned long dynsymcount
= 0;
681 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
683 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
684 if ((p
->flags
& SEC_EXCLUDE
) == 0
685 && (p
->flags
& SEC_ALLOC
) != 0
686 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
687 elf_section_data (p
)->dynindx
= ++dynsymcount
;
690 if (elf_hash_table (info
)->dynlocal
)
692 struct elf_link_local_dynamic_entry
*p
;
693 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
694 p
->dynindx
= ++dynsymcount
;
697 elf_link_hash_traverse (elf_hash_table (info
),
698 elf_link_renumber_hash_table_dynsyms
,
701 /* There is an unused NULL entry at the head of the table which
702 we must account for in our count. Unless there weren't any
703 symbols, which means we'll have no table at all. */
704 if (dynsymcount
!= 0)
707 return elf_hash_table (info
)->dynsymcount
= dynsymcount
;
710 /* This function is called when we want to define a new symbol. It
711 handles the various cases which arise when we find a definition in
712 a dynamic object, or when there is already a definition in a
713 dynamic object. The new symbol is described by NAME, SYM, PSEC,
714 and PVALUE. We set SYM_HASH to the hash table entry. We set
715 OVERRIDE if the old symbol is overriding a new definition. We set
716 TYPE_CHANGE_OK if it is OK for the type to change. We set
717 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
718 change, we mean that we shouldn't warn if the type or size does
722 _bfd_elf_merge_symbol (bfd
*abfd
,
723 struct bfd_link_info
*info
,
725 Elf_Internal_Sym
*sym
,
728 struct elf_link_hash_entry
**sym_hash
,
730 bfd_boolean
*override
,
731 bfd_boolean
*type_change_ok
,
732 bfd_boolean
*size_change_ok
)
734 asection
*sec
, *oldsec
;
735 struct elf_link_hash_entry
*h
;
736 struct elf_link_hash_entry
*flip
;
739 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
740 bfd_boolean newweak
, oldweak
;
746 bind
= ELF_ST_BIND (sym
->st_info
);
748 if (! bfd_is_und_section (sec
))
749 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
751 h
= ((struct elf_link_hash_entry
*)
752 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
757 /* This code is for coping with dynamic objects, and is only useful
758 if we are doing an ELF link. */
759 if (info
->hash
->creator
!= abfd
->xvec
)
762 /* For merging, we only care about real symbols. */
764 while (h
->root
.type
== bfd_link_hash_indirect
765 || h
->root
.type
== bfd_link_hash_warning
)
766 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
768 /* If we just created the symbol, mark it as being an ELF symbol.
769 Other than that, there is nothing to do--there is no merge issue
770 with a newly defined symbol--so we just return. */
772 if (h
->root
.type
== bfd_link_hash_new
)
778 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
781 switch (h
->root
.type
)
788 case bfd_link_hash_undefined
:
789 case bfd_link_hash_undefweak
:
790 oldbfd
= h
->root
.u
.undef
.abfd
;
794 case bfd_link_hash_defined
:
795 case bfd_link_hash_defweak
:
796 oldbfd
= h
->root
.u
.def
.section
->owner
;
797 oldsec
= h
->root
.u
.def
.section
;
800 case bfd_link_hash_common
:
801 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
802 oldsec
= h
->root
.u
.c
.p
->section
;
806 /* In cases involving weak versioned symbols, we may wind up trying
807 to merge a symbol with itself. Catch that here, to avoid the
808 confusion that results if we try to override a symbol with
809 itself. The additional tests catch cases like
810 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
811 dynamic object, which we do want to handle here. */
813 && ((abfd
->flags
& DYNAMIC
) == 0
817 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
818 respectively, is from a dynamic object. */
820 if ((abfd
->flags
& DYNAMIC
) != 0)
826 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
831 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
832 indices used by MIPS ELF. */
833 switch (h
->root
.type
)
839 case bfd_link_hash_defined
:
840 case bfd_link_hash_defweak
:
841 hsec
= h
->root
.u
.def
.section
;
844 case bfd_link_hash_common
:
845 hsec
= h
->root
.u
.c
.p
->section
;
852 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
855 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
856 respectively, appear to be a definition rather than reference. */
858 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
863 if (h
->root
.type
== bfd_link_hash_undefined
864 || h
->root
.type
== bfd_link_hash_undefweak
865 || h
->root
.type
== bfd_link_hash_common
)
870 /* Check TLS symbol. */
871 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
872 && ELF_ST_TYPE (sym
->st_info
) != h
->type
)
875 bfd_boolean ntdef
, tdef
;
876 asection
*ntsec
, *tsec
;
878 if (h
->type
== STT_TLS
)
898 (*_bfd_error_handler
)
899 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
900 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
901 else if (!tdef
&& !ntdef
)
902 (*_bfd_error_handler
)
903 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
904 tbfd
, ntbfd
, h
->root
.root
.string
);
906 (*_bfd_error_handler
)
907 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
908 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
910 (*_bfd_error_handler
)
911 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
912 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
914 bfd_set_error (bfd_error_bad_value
);
918 /* We need to remember if a symbol has a definition in a dynamic
919 object or is weak in all dynamic objects. Internal and hidden
920 visibility will make it unavailable to dynamic objects. */
921 if (newdyn
&& !h
->dynamic_def
)
923 if (!bfd_is_und_section (sec
))
927 /* Check if this symbol is weak in all dynamic objects. If it
928 is the first time we see it in a dynamic object, we mark
929 if it is weak. Otherwise, we clear it. */
932 if (bind
== STB_WEAK
)
935 else if (bind
!= STB_WEAK
)
940 /* If the old symbol has non-default visibility, we ignore the new
941 definition from a dynamic object. */
943 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
944 && !bfd_is_und_section (sec
))
947 /* Make sure this symbol is dynamic. */
949 /* A protected symbol has external availability. Make sure it is
952 FIXME: Should we check type and size for protected symbol? */
953 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
954 return bfd_elf_link_record_dynamic_symbol (info
, h
);
959 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
962 /* If the new symbol with non-default visibility comes from a
963 relocatable file and the old definition comes from a dynamic
964 object, we remove the old definition. */
965 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
968 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
969 && bfd_is_und_section (sec
))
971 /* If the new symbol is undefined and the old symbol was
972 also undefined before, we need to make sure
973 _bfd_generic_link_add_one_symbol doesn't mess
974 up the linker hash table undefs list. Since the old
975 definition came from a dynamic object, it is still on the
977 h
->root
.type
= bfd_link_hash_undefined
;
978 h
->root
.u
.undef
.abfd
= abfd
;
982 h
->root
.type
= bfd_link_hash_new
;
983 h
->root
.u
.undef
.abfd
= NULL
;
992 /* FIXME: Should we check type and size for protected symbol? */
998 /* Differentiate strong and weak symbols. */
999 newweak
= bind
== STB_WEAK
;
1000 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1001 || h
->root
.type
== bfd_link_hash_undefweak
);
1003 /* If a new weak symbol definition comes from a regular file and the
1004 old symbol comes from a dynamic library, we treat the new one as
1005 strong. Similarly, an old weak symbol definition from a regular
1006 file is treated as strong when the new symbol comes from a dynamic
1007 library. Further, an old weak symbol from a dynamic library is
1008 treated as strong if the new symbol is from a dynamic library.
1009 This reflects the way glibc's ld.so works.
1011 Do this before setting *type_change_ok or *size_change_ok so that
1012 we warn properly when dynamic library symbols are overridden. */
1014 if (newdef
&& !newdyn
&& olddyn
)
1016 if (olddef
&& newdyn
)
1019 /* It's OK to change the type if either the existing symbol or the
1020 new symbol is weak. A type change is also OK if the old symbol
1021 is undefined and the new symbol is defined. */
1026 && h
->root
.type
== bfd_link_hash_undefined
))
1027 *type_change_ok
= TRUE
;
1029 /* It's OK to change the size if either the existing symbol or the
1030 new symbol is weak, or if the old symbol is undefined. */
1033 || h
->root
.type
== bfd_link_hash_undefined
)
1034 *size_change_ok
= TRUE
;
1036 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1037 symbol, respectively, appears to be a common symbol in a dynamic
1038 object. If a symbol appears in an uninitialized section, and is
1039 not weak, and is not a function, then it may be a common symbol
1040 which was resolved when the dynamic object was created. We want
1041 to treat such symbols specially, because they raise special
1042 considerations when setting the symbol size: if the symbol
1043 appears as a common symbol in a regular object, and the size in
1044 the regular object is larger, we must make sure that we use the
1045 larger size. This problematic case can always be avoided in C,
1046 but it must be handled correctly when using Fortran shared
1049 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1050 likewise for OLDDYNCOMMON and OLDDEF.
1052 Note that this test is just a heuristic, and that it is quite
1053 possible to have an uninitialized symbol in a shared object which
1054 is really a definition, rather than a common symbol. This could
1055 lead to some minor confusion when the symbol really is a common
1056 symbol in some regular object. However, I think it will be
1062 && (sec
->flags
& SEC_ALLOC
) != 0
1063 && (sec
->flags
& SEC_LOAD
) == 0
1065 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
1066 newdyncommon
= TRUE
;
1068 newdyncommon
= FALSE
;
1072 && h
->root
.type
== bfd_link_hash_defined
1074 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1075 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1077 && h
->type
!= STT_FUNC
)
1078 olddyncommon
= TRUE
;
1080 olddyncommon
= FALSE
;
1082 /* If both the old and the new symbols look like common symbols in a
1083 dynamic object, set the size of the symbol to the larger of the
1088 && sym
->st_size
!= h
->size
)
1090 /* Since we think we have two common symbols, issue a multiple
1091 common warning if desired. Note that we only warn if the
1092 size is different. If the size is the same, we simply let
1093 the old symbol override the new one as normally happens with
1094 symbols defined in dynamic objects. */
1096 if (! ((*info
->callbacks
->multiple_common
)
1097 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1098 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1101 if (sym
->st_size
> h
->size
)
1102 h
->size
= sym
->st_size
;
1104 *size_change_ok
= TRUE
;
1107 /* If we are looking at a dynamic object, and we have found a
1108 definition, we need to see if the symbol was already defined by
1109 some other object. If so, we want to use the existing
1110 definition, and we do not want to report a multiple symbol
1111 definition error; we do this by clobbering *PSEC to be
1112 bfd_und_section_ptr.
1114 We treat a common symbol as a definition if the symbol in the
1115 shared library is a function, since common symbols always
1116 represent variables; this can cause confusion in principle, but
1117 any such confusion would seem to indicate an erroneous program or
1118 shared library. We also permit a common symbol in a regular
1119 object to override a weak symbol in a shared object. */
1124 || (h
->root
.type
== bfd_link_hash_common
1126 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
1130 newdyncommon
= FALSE
;
1132 *psec
= sec
= bfd_und_section_ptr
;
1133 *size_change_ok
= TRUE
;
1135 /* If we get here when the old symbol is a common symbol, then
1136 we are explicitly letting it override a weak symbol or
1137 function in a dynamic object, and we don't want to warn about
1138 a type change. If the old symbol is a defined symbol, a type
1139 change warning may still be appropriate. */
1141 if (h
->root
.type
== bfd_link_hash_common
)
1142 *type_change_ok
= TRUE
;
1145 /* Handle the special case of an old common symbol merging with a
1146 new symbol which looks like a common symbol in a shared object.
1147 We change *PSEC and *PVALUE to make the new symbol look like a
1148 common symbol, and let _bfd_generic_link_add_one_symbol will do
1152 && h
->root
.type
== bfd_link_hash_common
)
1156 newdyncommon
= FALSE
;
1157 *pvalue
= sym
->st_size
;
1158 *psec
= sec
= bfd_com_section_ptr
;
1159 *size_change_ok
= TRUE
;
1162 /* If the old symbol is from a dynamic object, and the new symbol is
1163 a definition which is not from a dynamic object, then the new
1164 symbol overrides the old symbol. Symbols from regular files
1165 always take precedence over symbols from dynamic objects, even if
1166 they are defined after the dynamic object in the link.
1168 As above, we again permit a common symbol in a regular object to
1169 override a definition in a shared object if the shared object
1170 symbol is a function or is weak. */
1175 || (bfd_is_com_section (sec
)
1177 || h
->type
== STT_FUNC
)))
1182 /* Change the hash table entry to undefined, and let
1183 _bfd_generic_link_add_one_symbol do the right thing with the
1186 h
->root
.type
= bfd_link_hash_undefined
;
1187 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1188 *size_change_ok
= TRUE
;
1191 olddyncommon
= FALSE
;
1193 /* We again permit a type change when a common symbol may be
1194 overriding a function. */
1196 if (bfd_is_com_section (sec
))
1197 *type_change_ok
= TRUE
;
1199 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1202 /* This union may have been set to be non-NULL when this symbol
1203 was seen in a dynamic object. We must force the union to be
1204 NULL, so that it is correct for a regular symbol. */
1205 h
->verinfo
.vertree
= NULL
;
1208 /* Handle the special case of a new common symbol merging with an
1209 old symbol that looks like it might be a common symbol defined in
1210 a shared object. Note that we have already handled the case in
1211 which a new common symbol should simply override the definition
1212 in the shared library. */
1215 && bfd_is_com_section (sec
)
1218 /* It would be best if we could set the hash table entry to a
1219 common symbol, but we don't know what to use for the section
1220 or the alignment. */
1221 if (! ((*info
->callbacks
->multiple_common
)
1222 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1223 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1226 /* If the presumed common symbol in the dynamic object is
1227 larger, pretend that the new symbol has its size. */
1229 if (h
->size
> *pvalue
)
1232 /* FIXME: We no longer know the alignment required by the symbol
1233 in the dynamic object, so we just wind up using the one from
1234 the regular object. */
1237 olddyncommon
= FALSE
;
1239 h
->root
.type
= bfd_link_hash_undefined
;
1240 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1242 *size_change_ok
= TRUE
;
1243 *type_change_ok
= TRUE
;
1245 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1248 h
->verinfo
.vertree
= NULL
;
1253 /* Handle the case where we had a versioned symbol in a dynamic
1254 library and now find a definition in a normal object. In this
1255 case, we make the versioned symbol point to the normal one. */
1256 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1257 flip
->root
.type
= h
->root
.type
;
1258 h
->root
.type
= bfd_link_hash_indirect
;
1259 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1260 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, flip
, h
);
1261 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1265 flip
->ref_dynamic
= 1;
1272 /* This function is called to create an indirect symbol from the
1273 default for the symbol with the default version if needed. The
1274 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1275 set DYNSYM if the new indirect symbol is dynamic. */
1278 _bfd_elf_add_default_symbol (bfd
*abfd
,
1279 struct bfd_link_info
*info
,
1280 struct elf_link_hash_entry
*h
,
1282 Elf_Internal_Sym
*sym
,
1285 bfd_boolean
*dynsym
,
1286 bfd_boolean override
)
1288 bfd_boolean type_change_ok
;
1289 bfd_boolean size_change_ok
;
1292 struct elf_link_hash_entry
*hi
;
1293 struct bfd_link_hash_entry
*bh
;
1294 const struct elf_backend_data
*bed
;
1295 bfd_boolean collect
;
1296 bfd_boolean dynamic
;
1298 size_t len
, shortlen
;
1301 /* If this symbol has a version, and it is the default version, we
1302 create an indirect symbol from the default name to the fully
1303 decorated name. This will cause external references which do not
1304 specify a version to be bound to this version of the symbol. */
1305 p
= strchr (name
, ELF_VER_CHR
);
1306 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1311 /* We are overridden by an old definition. We need to check if we
1312 need to create the indirect symbol from the default name. */
1313 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1315 BFD_ASSERT (hi
!= NULL
);
1318 while (hi
->root
.type
== bfd_link_hash_indirect
1319 || hi
->root
.type
== bfd_link_hash_warning
)
1321 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1327 bed
= get_elf_backend_data (abfd
);
1328 collect
= bed
->collect
;
1329 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1331 shortlen
= p
- name
;
1332 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1333 if (shortname
== NULL
)
1335 memcpy (shortname
, name
, shortlen
);
1336 shortname
[shortlen
] = '\0';
1338 /* We are going to create a new symbol. Merge it with any existing
1339 symbol with this name. For the purposes of the merge, act as
1340 though we were defining the symbol we just defined, although we
1341 actually going to define an indirect symbol. */
1342 type_change_ok
= FALSE
;
1343 size_change_ok
= FALSE
;
1345 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1346 &hi
, &skip
, &override
, &type_change_ok
,
1356 if (! (_bfd_generic_link_add_one_symbol
1357 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1358 0, name
, FALSE
, collect
, &bh
)))
1360 hi
= (struct elf_link_hash_entry
*) bh
;
1364 /* In this case the symbol named SHORTNAME is overriding the
1365 indirect symbol we want to add. We were planning on making
1366 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1367 is the name without a version. NAME is the fully versioned
1368 name, and it is the default version.
1370 Overriding means that we already saw a definition for the
1371 symbol SHORTNAME in a regular object, and it is overriding
1372 the symbol defined in the dynamic object.
1374 When this happens, we actually want to change NAME, the
1375 symbol we just added, to refer to SHORTNAME. This will cause
1376 references to NAME in the shared object to become references
1377 to SHORTNAME in the regular object. This is what we expect
1378 when we override a function in a shared object: that the
1379 references in the shared object will be mapped to the
1380 definition in the regular object. */
1382 while (hi
->root
.type
== bfd_link_hash_indirect
1383 || hi
->root
.type
== bfd_link_hash_warning
)
1384 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1386 h
->root
.type
= bfd_link_hash_indirect
;
1387 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1391 hi
->ref_dynamic
= 1;
1395 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1400 /* Now set HI to H, so that the following code will set the
1401 other fields correctly. */
1405 /* If there is a duplicate definition somewhere, then HI may not
1406 point to an indirect symbol. We will have reported an error to
1407 the user in that case. */
1409 if (hi
->root
.type
== bfd_link_hash_indirect
)
1411 struct elf_link_hash_entry
*ht
;
1413 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1414 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, ht
, hi
);
1416 /* See if the new flags lead us to realize that the symbol must
1428 if (hi
->ref_regular
)
1434 /* We also need to define an indirection from the nondefault version
1438 len
= strlen (name
);
1439 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1440 if (shortname
== NULL
)
1442 memcpy (shortname
, name
, shortlen
);
1443 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1445 /* Once again, merge with any existing symbol. */
1446 type_change_ok
= FALSE
;
1447 size_change_ok
= FALSE
;
1449 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1450 &hi
, &skip
, &override
, &type_change_ok
,
1459 /* Here SHORTNAME is a versioned name, so we don't expect to see
1460 the type of override we do in the case above unless it is
1461 overridden by a versioned definition. */
1462 if (hi
->root
.type
!= bfd_link_hash_defined
1463 && hi
->root
.type
!= bfd_link_hash_defweak
)
1464 (*_bfd_error_handler
)
1465 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1471 if (! (_bfd_generic_link_add_one_symbol
1472 (info
, abfd
, shortname
, BSF_INDIRECT
,
1473 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1475 hi
= (struct elf_link_hash_entry
*) bh
;
1477 /* If there is a duplicate definition somewhere, then HI may not
1478 point to an indirect symbol. We will have reported an error
1479 to the user in that case. */
1481 if (hi
->root
.type
== bfd_link_hash_indirect
)
1483 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
1485 /* See if the new flags lead us to realize that the symbol
1497 if (hi
->ref_regular
)
1507 /* This routine is used to export all defined symbols into the dynamic
1508 symbol table. It is called via elf_link_hash_traverse. */
1511 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1513 struct elf_info_failed
*eif
= data
;
1515 /* Ignore indirect symbols. These are added by the versioning code. */
1516 if (h
->root
.type
== bfd_link_hash_indirect
)
1519 if (h
->root
.type
== bfd_link_hash_warning
)
1520 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1522 if (h
->dynindx
== -1
1526 struct bfd_elf_version_tree
*t
;
1527 struct bfd_elf_version_expr
*d
;
1529 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
1531 if (t
->globals
.list
!= NULL
)
1533 d
= (*t
->match
) (&t
->globals
, NULL
, h
->root
.root
.string
);
1538 if (t
->locals
.list
!= NULL
)
1540 d
= (*t
->match
) (&t
->locals
, NULL
, h
->root
.root
.string
);
1549 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1560 /* Look through the symbols which are defined in other shared
1561 libraries and referenced here. Update the list of version
1562 dependencies. This will be put into the .gnu.version_r section.
1563 This function is called via elf_link_hash_traverse. */
1566 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1569 struct elf_find_verdep_info
*rinfo
= data
;
1570 Elf_Internal_Verneed
*t
;
1571 Elf_Internal_Vernaux
*a
;
1574 if (h
->root
.type
== bfd_link_hash_warning
)
1575 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1577 /* We only care about symbols defined in shared objects with version
1582 || h
->verinfo
.verdef
== NULL
)
1585 /* See if we already know about this version. */
1586 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
1588 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1591 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1592 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1598 /* This is a new version. Add it to tree we are building. */
1603 t
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1606 rinfo
->failed
= TRUE
;
1610 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1611 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
1612 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
1616 a
= bfd_zalloc (rinfo
->output_bfd
, amt
);
1618 /* Note that we are copying a string pointer here, and testing it
1619 above. If bfd_elf_string_from_elf_section is ever changed to
1620 discard the string data when low in memory, this will have to be
1622 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1624 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1625 a
->vna_nextptr
= t
->vn_auxptr
;
1627 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1630 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1637 /* Figure out appropriate versions for all the symbols. We may not
1638 have the version number script until we have read all of the input
1639 files, so until that point we don't know which symbols should be
1640 local. This function is called via elf_link_hash_traverse. */
1643 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1645 struct elf_assign_sym_version_info
*sinfo
;
1646 struct bfd_link_info
*info
;
1647 const struct elf_backend_data
*bed
;
1648 struct elf_info_failed eif
;
1655 if (h
->root
.type
== bfd_link_hash_warning
)
1656 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1658 /* Fix the symbol flags. */
1661 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1664 sinfo
->failed
= TRUE
;
1668 /* We only need version numbers for symbols defined in regular
1670 if (!h
->def_regular
)
1673 bed
= get_elf_backend_data (sinfo
->output_bfd
);
1674 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1675 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1677 struct bfd_elf_version_tree
*t
;
1682 /* There are two consecutive ELF_VER_CHR characters if this is
1683 not a hidden symbol. */
1685 if (*p
== ELF_VER_CHR
)
1691 /* If there is no version string, we can just return out. */
1699 /* Look for the version. If we find it, it is no longer weak. */
1700 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1702 if (strcmp (t
->name
, p
) == 0)
1706 struct bfd_elf_version_expr
*d
;
1708 len
= p
- h
->root
.root
.string
;
1709 alc
= bfd_malloc (len
);
1712 memcpy (alc
, h
->root
.root
.string
, len
- 1);
1713 alc
[len
- 1] = '\0';
1714 if (alc
[len
- 2] == ELF_VER_CHR
)
1715 alc
[len
- 2] = '\0';
1717 h
->verinfo
.vertree
= t
;
1721 if (t
->globals
.list
!= NULL
)
1722 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
1724 /* See if there is anything to force this symbol to
1726 if (d
== NULL
&& t
->locals
.list
!= NULL
)
1728 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
1732 && ! info
->export_dynamic
)
1733 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1741 /* If we are building an application, we need to create a
1742 version node for this version. */
1743 if (t
== NULL
&& info
->executable
)
1745 struct bfd_elf_version_tree
**pp
;
1748 /* If we aren't going to export this symbol, we don't need
1749 to worry about it. */
1750 if (h
->dynindx
== -1)
1754 t
= bfd_zalloc (sinfo
->output_bfd
, amt
);
1757 sinfo
->failed
= TRUE
;
1762 t
->name_indx
= (unsigned int) -1;
1766 /* Don't count anonymous version tag. */
1767 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
1769 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
1771 t
->vernum
= version_index
;
1775 h
->verinfo
.vertree
= t
;
1779 /* We could not find the version for a symbol when
1780 generating a shared archive. Return an error. */
1781 (*_bfd_error_handler
)
1782 (_("%B: undefined versioned symbol name %s"),
1783 sinfo
->output_bfd
, h
->root
.root
.string
);
1784 bfd_set_error (bfd_error_bad_value
);
1785 sinfo
->failed
= TRUE
;
1793 /* If we don't have a version for this symbol, see if we can find
1795 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
1797 struct bfd_elf_version_tree
*t
;
1798 struct bfd_elf_version_tree
*local_ver
;
1799 struct bfd_elf_version_expr
*d
;
1801 /* See if can find what version this symbol is in. If the
1802 symbol is supposed to be local, then don't actually register
1805 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1807 if (t
->globals
.list
!= NULL
)
1809 bfd_boolean matched
;
1813 while ((d
= (*t
->match
) (&t
->globals
, d
,
1814 h
->root
.root
.string
)) != NULL
)
1819 /* There is a version without definition. Make
1820 the symbol the default definition for this
1822 h
->verinfo
.vertree
= t
;
1830 /* There is no undefined version for this symbol. Hide the
1832 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1835 if (t
->locals
.list
!= NULL
)
1838 while ((d
= (*t
->match
) (&t
->locals
, d
,
1839 h
->root
.root
.string
)) != NULL
)
1842 /* If the match is "*", keep looking for a more
1843 explicit, perhaps even global, match.
1844 XXX: Shouldn't this be !d->wildcard instead? */
1845 if (d
->pattern
[0] != '*' || d
->pattern
[1] != '\0')
1854 if (local_ver
!= NULL
)
1856 h
->verinfo
.vertree
= local_ver
;
1857 if (h
->dynindx
!= -1
1859 && ! info
->export_dynamic
)
1861 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1869 /* Read and swap the relocs from the section indicated by SHDR. This
1870 may be either a REL or a RELA section. The relocations are
1871 translated into RELA relocations and stored in INTERNAL_RELOCS,
1872 which should have already been allocated to contain enough space.
1873 The EXTERNAL_RELOCS are a buffer where the external form of the
1874 relocations should be stored.
1876 Returns FALSE if something goes wrong. */
1879 elf_link_read_relocs_from_section (bfd
*abfd
,
1881 Elf_Internal_Shdr
*shdr
,
1882 void *external_relocs
,
1883 Elf_Internal_Rela
*internal_relocs
)
1885 const struct elf_backend_data
*bed
;
1886 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
1887 const bfd_byte
*erela
;
1888 const bfd_byte
*erelaend
;
1889 Elf_Internal_Rela
*irela
;
1890 Elf_Internal_Shdr
*symtab_hdr
;
1893 /* Position ourselves at the start of the section. */
1894 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
1897 /* Read the relocations. */
1898 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
1901 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1902 nsyms
= symtab_hdr
->sh_size
/ symtab_hdr
->sh_entsize
;
1904 bed
= get_elf_backend_data (abfd
);
1906 /* Convert the external relocations to the internal format. */
1907 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
1908 swap_in
= bed
->s
->swap_reloc_in
;
1909 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
1910 swap_in
= bed
->s
->swap_reloca_in
;
1913 bfd_set_error (bfd_error_wrong_format
);
1917 erela
= external_relocs
;
1918 erelaend
= erela
+ shdr
->sh_size
;
1919 irela
= internal_relocs
;
1920 while (erela
< erelaend
)
1924 (*swap_in
) (abfd
, erela
, irela
);
1925 r_symndx
= ELF32_R_SYM (irela
->r_info
);
1926 if (bed
->s
->arch_size
== 64)
1928 if ((size_t) r_symndx
>= nsyms
)
1930 (*_bfd_error_handler
)
1931 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
1932 " for offset 0x%lx in section `%A'"),
1934 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
1935 bfd_set_error (bfd_error_bad_value
);
1938 irela
+= bed
->s
->int_rels_per_ext_rel
;
1939 erela
+= shdr
->sh_entsize
;
1945 /* Read and swap the relocs for a section O. They may have been
1946 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
1947 not NULL, they are used as buffers to read into. They are known to
1948 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
1949 the return value is allocated using either malloc or bfd_alloc,
1950 according to the KEEP_MEMORY argument. If O has two relocation
1951 sections (both REL and RELA relocations), then the REL_HDR
1952 relocations will appear first in INTERNAL_RELOCS, followed by the
1953 REL_HDR2 relocations. */
1956 _bfd_elf_link_read_relocs (bfd
*abfd
,
1958 void *external_relocs
,
1959 Elf_Internal_Rela
*internal_relocs
,
1960 bfd_boolean keep_memory
)
1962 Elf_Internal_Shdr
*rel_hdr
;
1963 void *alloc1
= NULL
;
1964 Elf_Internal_Rela
*alloc2
= NULL
;
1965 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1967 if (elf_section_data (o
)->relocs
!= NULL
)
1968 return elf_section_data (o
)->relocs
;
1970 if (o
->reloc_count
== 0)
1973 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1975 if (internal_relocs
== NULL
)
1979 size
= o
->reloc_count
;
1980 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
1982 internal_relocs
= bfd_alloc (abfd
, size
);
1984 internal_relocs
= alloc2
= bfd_malloc (size
);
1985 if (internal_relocs
== NULL
)
1989 if (external_relocs
== NULL
)
1991 bfd_size_type size
= rel_hdr
->sh_size
;
1993 if (elf_section_data (o
)->rel_hdr2
)
1994 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
1995 alloc1
= bfd_malloc (size
);
1998 external_relocs
= alloc1
;
2001 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
2005 if (elf_section_data (o
)->rel_hdr2
2006 && (!elf_link_read_relocs_from_section
2008 elf_section_data (o
)->rel_hdr2
,
2009 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2010 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2011 * bed
->s
->int_rels_per_ext_rel
))))
2014 /* Cache the results for next time, if we can. */
2016 elf_section_data (o
)->relocs
= internal_relocs
;
2021 /* Don't free alloc2, since if it was allocated we are passing it
2022 back (under the name of internal_relocs). */
2024 return internal_relocs
;
2034 /* Compute the size of, and allocate space for, REL_HDR which is the
2035 section header for a section containing relocations for O. */
2038 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2039 Elf_Internal_Shdr
*rel_hdr
,
2042 bfd_size_type reloc_count
;
2043 bfd_size_type num_rel_hashes
;
2045 /* Figure out how many relocations there will be. */
2046 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
2047 reloc_count
= elf_section_data (o
)->rel_count
;
2049 reloc_count
= elf_section_data (o
)->rel_count2
;
2051 num_rel_hashes
= o
->reloc_count
;
2052 if (num_rel_hashes
< reloc_count
)
2053 num_rel_hashes
= reloc_count
;
2055 /* That allows us to calculate the size of the section. */
2056 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
2058 /* The contents field must last into write_object_contents, so we
2059 allocate it with bfd_alloc rather than malloc. Also since we
2060 cannot be sure that the contents will actually be filled in,
2061 we zero the allocated space. */
2062 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2063 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2066 /* We only allocate one set of hash entries, so we only do it the
2067 first time we are called. */
2068 if (elf_section_data (o
)->rel_hashes
== NULL
2071 struct elf_link_hash_entry
**p
;
2073 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2077 elf_section_data (o
)->rel_hashes
= p
;
2083 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2084 originated from the section given by INPUT_REL_HDR) to the
2088 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2089 asection
*input_section
,
2090 Elf_Internal_Shdr
*input_rel_hdr
,
2091 Elf_Internal_Rela
*internal_relocs
)
2093 Elf_Internal_Rela
*irela
;
2094 Elf_Internal_Rela
*irelaend
;
2096 Elf_Internal_Shdr
*output_rel_hdr
;
2097 asection
*output_section
;
2098 unsigned int *rel_countp
= NULL
;
2099 const struct elf_backend_data
*bed
;
2100 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2102 output_section
= input_section
->output_section
;
2103 output_rel_hdr
= NULL
;
2105 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2106 == input_rel_hdr
->sh_entsize
)
2108 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2109 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2111 else if (elf_section_data (output_section
)->rel_hdr2
2112 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2113 == input_rel_hdr
->sh_entsize
))
2115 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2116 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2120 (*_bfd_error_handler
)
2121 (_("%B: relocation size mismatch in %B section %A"),
2122 output_bfd
, input_section
->owner
, input_section
);
2123 bfd_set_error (bfd_error_wrong_object_format
);
2127 bed
= get_elf_backend_data (output_bfd
);
2128 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2129 swap_out
= bed
->s
->swap_reloc_out
;
2130 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2131 swap_out
= bed
->s
->swap_reloca_out
;
2135 erel
= output_rel_hdr
->contents
;
2136 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2137 irela
= internal_relocs
;
2138 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2139 * bed
->s
->int_rels_per_ext_rel
);
2140 while (irela
< irelaend
)
2142 (*swap_out
) (output_bfd
, irela
, erel
);
2143 irela
+= bed
->s
->int_rels_per_ext_rel
;
2144 erel
+= input_rel_hdr
->sh_entsize
;
2147 /* Bump the counter, so that we know where to add the next set of
2149 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2154 /* Fix up the flags for a symbol. This handles various cases which
2155 can only be fixed after all the input files are seen. This is
2156 currently called by both adjust_dynamic_symbol and
2157 assign_sym_version, which is unnecessary but perhaps more robust in
2158 the face of future changes. */
2161 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2162 struct elf_info_failed
*eif
)
2164 /* If this symbol was mentioned in a non-ELF file, try to set
2165 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2166 permit a non-ELF file to correctly refer to a symbol defined in
2167 an ELF dynamic object. */
2170 while (h
->root
.type
== bfd_link_hash_indirect
)
2171 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2173 if (h
->root
.type
!= bfd_link_hash_defined
2174 && h
->root
.type
!= bfd_link_hash_defweak
)
2177 h
->ref_regular_nonweak
= 1;
2181 if (h
->root
.u
.def
.section
->owner
!= NULL
2182 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2183 == bfd_target_elf_flavour
))
2186 h
->ref_regular_nonweak
= 1;
2192 if (h
->dynindx
== -1
2196 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2205 /* Unfortunately, NON_ELF is only correct if the symbol
2206 was first seen in a non-ELF file. Fortunately, if the symbol
2207 was first seen in an ELF file, we're probably OK unless the
2208 symbol was defined in a non-ELF file. Catch that case here.
2209 FIXME: We're still in trouble if the symbol was first seen in
2210 a dynamic object, and then later in a non-ELF regular object. */
2211 if ((h
->root
.type
== bfd_link_hash_defined
2212 || h
->root
.type
== bfd_link_hash_defweak
)
2214 && (h
->root
.u
.def
.section
->owner
!= NULL
2215 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2216 != bfd_target_elf_flavour
)
2217 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2218 && !h
->def_dynamic
)))
2222 /* If this is a final link, and the symbol was defined as a common
2223 symbol in a regular object file, and there was no definition in
2224 any dynamic object, then the linker will have allocated space for
2225 the symbol in a common section but the DEF_REGULAR
2226 flag will not have been set. */
2227 if (h
->root
.type
== bfd_link_hash_defined
2231 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2234 /* If -Bsymbolic was used (which means to bind references to global
2235 symbols to the definition within the shared object), and this
2236 symbol was defined in a regular object, then it actually doesn't
2237 need a PLT entry. Likewise, if the symbol has non-default
2238 visibility. If the symbol has hidden or internal visibility, we
2239 will force it local. */
2241 && eif
->info
->shared
2242 && is_elf_hash_table (eif
->info
->hash
)
2243 && (eif
->info
->symbolic
2244 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2247 const struct elf_backend_data
*bed
;
2248 bfd_boolean force_local
;
2250 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2252 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2253 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2254 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2257 /* If a weak undefined symbol has non-default visibility, we also
2258 hide it from the dynamic linker. */
2259 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2260 && h
->root
.type
== bfd_link_hash_undefweak
)
2262 const struct elf_backend_data
*bed
;
2263 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2264 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2267 /* If this is a weak defined symbol in a dynamic object, and we know
2268 the real definition in the dynamic object, copy interesting flags
2269 over to the real definition. */
2270 if (h
->u
.weakdef
!= NULL
)
2272 struct elf_link_hash_entry
*weakdef
;
2274 weakdef
= h
->u
.weakdef
;
2275 if (h
->root
.type
== bfd_link_hash_indirect
)
2276 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2278 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2279 || h
->root
.type
== bfd_link_hash_defweak
);
2280 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2281 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2282 BFD_ASSERT (weakdef
->def_dynamic
);
2284 /* If the real definition is defined by a regular object file,
2285 don't do anything special. See the longer description in
2286 _bfd_elf_adjust_dynamic_symbol, below. */
2287 if (weakdef
->def_regular
)
2288 h
->u
.weakdef
= NULL
;
2291 const struct elf_backend_data
*bed
;
2293 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2294 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, weakdef
, h
);
2301 /* Make the backend pick a good value for a dynamic symbol. This is
2302 called via elf_link_hash_traverse, and also calls itself
2306 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2308 struct elf_info_failed
*eif
= data
;
2310 const struct elf_backend_data
*bed
;
2312 if (! is_elf_hash_table (eif
->info
->hash
))
2315 if (h
->root
.type
== bfd_link_hash_warning
)
2317 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2318 h
->got
= elf_hash_table (eif
->info
)->init_offset
;
2320 /* When warning symbols are created, they **replace** the "real"
2321 entry in the hash table, thus we never get to see the real
2322 symbol in a hash traversal. So look at it now. */
2323 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2326 /* Ignore indirect symbols. These are added by the versioning code. */
2327 if (h
->root
.type
== bfd_link_hash_indirect
)
2330 /* Fix the symbol flags. */
2331 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2334 /* If this symbol does not require a PLT entry, and it is not
2335 defined by a dynamic object, or is not referenced by a regular
2336 object, ignore it. We do have to handle a weak defined symbol,
2337 even if no regular object refers to it, if we decided to add it
2338 to the dynamic symbol table. FIXME: Do we normally need to worry
2339 about symbols which are defined by one dynamic object and
2340 referenced by another one? */
2345 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2347 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
2351 /* If we've already adjusted this symbol, don't do it again. This
2352 can happen via a recursive call. */
2353 if (h
->dynamic_adjusted
)
2356 /* Don't look at this symbol again. Note that we must set this
2357 after checking the above conditions, because we may look at a
2358 symbol once, decide not to do anything, and then get called
2359 recursively later after REF_REGULAR is set below. */
2360 h
->dynamic_adjusted
= 1;
2362 /* If this is a weak definition, and we know a real definition, and
2363 the real symbol is not itself defined by a regular object file,
2364 then get a good value for the real definition. We handle the
2365 real symbol first, for the convenience of the backend routine.
2367 Note that there is a confusing case here. If the real definition
2368 is defined by a regular object file, we don't get the real symbol
2369 from the dynamic object, but we do get the weak symbol. If the
2370 processor backend uses a COPY reloc, then if some routine in the
2371 dynamic object changes the real symbol, we will not see that
2372 change in the corresponding weak symbol. This is the way other
2373 ELF linkers work as well, and seems to be a result of the shared
2376 I will clarify this issue. Most SVR4 shared libraries define the
2377 variable _timezone and define timezone as a weak synonym. The
2378 tzset call changes _timezone. If you write
2379 extern int timezone;
2381 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2382 you might expect that, since timezone is a synonym for _timezone,
2383 the same number will print both times. However, if the processor
2384 backend uses a COPY reloc, then actually timezone will be copied
2385 into your process image, and, since you define _timezone
2386 yourself, _timezone will not. Thus timezone and _timezone will
2387 wind up at different memory locations. The tzset call will set
2388 _timezone, leaving timezone unchanged. */
2390 if (h
->u
.weakdef
!= NULL
)
2392 /* If we get to this point, we know there is an implicit
2393 reference by a regular object file via the weak symbol H.
2394 FIXME: Is this really true? What if the traversal finds
2395 H->U.WEAKDEF before it finds H? */
2396 h
->u
.weakdef
->ref_regular
= 1;
2398 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2402 /* If a symbol has no type and no size and does not require a PLT
2403 entry, then we are probably about to do the wrong thing here: we
2404 are probably going to create a COPY reloc for an empty object.
2405 This case can arise when a shared object is built with assembly
2406 code, and the assembly code fails to set the symbol type. */
2408 && h
->type
== STT_NOTYPE
2410 (*_bfd_error_handler
)
2411 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2412 h
->root
.root
.string
);
2414 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2415 bed
= get_elf_backend_data (dynobj
);
2416 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2425 /* Adjust all external symbols pointing into SEC_MERGE sections
2426 to reflect the object merging within the sections. */
2429 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2433 if (h
->root
.type
== bfd_link_hash_warning
)
2434 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2436 if ((h
->root
.type
== bfd_link_hash_defined
2437 || h
->root
.type
== bfd_link_hash_defweak
)
2438 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2439 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2441 bfd
*output_bfd
= data
;
2443 h
->root
.u
.def
.value
=
2444 _bfd_merged_section_offset (output_bfd
,
2445 &h
->root
.u
.def
.section
,
2446 elf_section_data (sec
)->sec_info
,
2447 h
->root
.u
.def
.value
);
2453 /* Returns false if the symbol referred to by H should be considered
2454 to resolve local to the current module, and true if it should be
2455 considered to bind dynamically. */
2458 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2459 struct bfd_link_info
*info
,
2460 bfd_boolean ignore_protected
)
2462 bfd_boolean binding_stays_local_p
;
2467 while (h
->root
.type
== bfd_link_hash_indirect
2468 || h
->root
.type
== bfd_link_hash_warning
)
2469 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2471 /* If it was forced local, then clearly it's not dynamic. */
2472 if (h
->dynindx
== -1)
2474 if (h
->forced_local
)
2477 /* Identify the cases where name binding rules say that a
2478 visible symbol resolves locally. */
2479 binding_stays_local_p
= info
->executable
|| info
->symbolic
;
2481 switch (ELF_ST_VISIBILITY (h
->other
))
2488 /* Proper resolution for function pointer equality may require
2489 that these symbols perhaps be resolved dynamically, even though
2490 we should be resolving them to the current module. */
2491 if (!ignore_protected
|| h
->type
!= STT_FUNC
)
2492 binding_stays_local_p
= TRUE
;
2499 /* If it isn't defined locally, then clearly it's dynamic. */
2500 if (!h
->def_regular
)
2503 /* Otherwise, the symbol is dynamic if binding rules don't tell
2504 us that it remains local. */
2505 return !binding_stays_local_p
;
2508 /* Return true if the symbol referred to by H should be considered
2509 to resolve local to the current module, and false otherwise. Differs
2510 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2511 undefined symbols and weak symbols. */
2514 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2515 struct bfd_link_info
*info
,
2516 bfd_boolean local_protected
)
2518 /* If it's a local sym, of course we resolve locally. */
2522 /* Common symbols that become definitions don't get the DEF_REGULAR
2523 flag set, so test it first, and don't bail out. */
2524 if (ELF_COMMON_DEF_P (h
))
2526 /* If we don't have a definition in a regular file, then we can't
2527 resolve locally. The sym is either undefined or dynamic. */
2528 else if (!h
->def_regular
)
2531 /* Forced local symbols resolve locally. */
2532 if (h
->forced_local
)
2535 /* As do non-dynamic symbols. */
2536 if (h
->dynindx
== -1)
2539 /* At this point, we know the symbol is defined and dynamic. In an
2540 executable it must resolve locally, likewise when building symbolic
2541 shared libraries. */
2542 if (info
->executable
|| info
->symbolic
)
2545 /* Now deal with defined dynamic symbols in shared libraries. Ones
2546 with default visibility might not resolve locally. */
2547 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2550 /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
2551 if (ELF_ST_VISIBILITY (h
->other
) != STV_PROTECTED
)
2554 /* STV_PROTECTED non-function symbols are local. */
2555 if (h
->type
!= STT_FUNC
)
2558 /* Function pointer equality tests may require that STV_PROTECTED
2559 symbols be treated as dynamic symbols, even when we know that the
2560 dynamic linker will resolve them locally. */
2561 return local_protected
;
2564 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2565 aligned. Returns the first TLS output section. */
2567 struct bfd_section
*
2568 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2570 struct bfd_section
*sec
, *tls
;
2571 unsigned int align
= 0;
2573 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2574 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2578 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2579 if (sec
->alignment_power
> align
)
2580 align
= sec
->alignment_power
;
2582 elf_hash_table (info
)->tls_sec
= tls
;
2584 /* Ensure the alignment of the first section is the largest alignment,
2585 so that the tls segment starts aligned. */
2587 tls
->alignment_power
= align
;
2592 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2594 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2595 Elf_Internal_Sym
*sym
)
2597 /* Local symbols do not count, but target specific ones might. */
2598 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2599 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2602 /* Function symbols do not count. */
2603 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
2606 /* If the section is undefined, then so is the symbol. */
2607 if (sym
->st_shndx
== SHN_UNDEF
)
2610 /* If the symbol is defined in the common section, then
2611 it is a common definition and so does not count. */
2612 if (sym
->st_shndx
== SHN_COMMON
)
2615 /* If the symbol is in a target specific section then we
2616 must rely upon the backend to tell us what it is. */
2617 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2618 /* FIXME - this function is not coded yet:
2620 return _bfd_is_global_symbol_definition (abfd, sym);
2622 Instead for now assume that the definition is not global,
2623 Even if this is wrong, at least the linker will behave
2624 in the same way that it used to do. */
2630 /* Search the symbol table of the archive element of the archive ABFD
2631 whose archive map contains a mention of SYMDEF, and determine if
2632 the symbol is defined in this element. */
2634 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2636 Elf_Internal_Shdr
* hdr
;
2637 bfd_size_type symcount
;
2638 bfd_size_type extsymcount
;
2639 bfd_size_type extsymoff
;
2640 Elf_Internal_Sym
*isymbuf
;
2641 Elf_Internal_Sym
*isym
;
2642 Elf_Internal_Sym
*isymend
;
2645 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2649 if (! bfd_check_format (abfd
, bfd_object
))
2652 /* If we have already included the element containing this symbol in the
2653 link then we do not need to include it again. Just claim that any symbol
2654 it contains is not a definition, so that our caller will not decide to
2655 (re)include this element. */
2656 if (abfd
->archive_pass
)
2659 /* Select the appropriate symbol table. */
2660 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2661 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2663 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2665 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2667 /* The sh_info field of the symtab header tells us where the
2668 external symbols start. We don't care about the local symbols. */
2669 if (elf_bad_symtab (abfd
))
2671 extsymcount
= symcount
;
2676 extsymcount
= symcount
- hdr
->sh_info
;
2677 extsymoff
= hdr
->sh_info
;
2680 if (extsymcount
== 0)
2683 /* Read in the symbol table. */
2684 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
2686 if (isymbuf
== NULL
)
2689 /* Scan the symbol table looking for SYMDEF. */
2691 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
2695 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
2700 if (strcmp (name
, symdef
->name
) == 0)
2702 result
= is_global_data_symbol_definition (abfd
, isym
);
2712 /* Add an entry to the .dynamic table. */
2715 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
2719 struct elf_link_hash_table
*hash_table
;
2720 const struct elf_backend_data
*bed
;
2722 bfd_size_type newsize
;
2723 bfd_byte
*newcontents
;
2724 Elf_Internal_Dyn dyn
;
2726 hash_table
= elf_hash_table (info
);
2727 if (! is_elf_hash_table (hash_table
))
2730 if (info
->warn_shared_textrel
&& info
->shared
&& tag
== DT_TEXTREL
)
2732 (_("warning: creating a DT_TEXTREL in a shared object."));
2734 bed
= get_elf_backend_data (hash_table
->dynobj
);
2735 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2736 BFD_ASSERT (s
!= NULL
);
2738 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
2739 newcontents
= bfd_realloc (s
->contents
, newsize
);
2740 if (newcontents
== NULL
)
2744 dyn
.d_un
.d_val
= val
;
2745 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
2748 s
->contents
= newcontents
;
2753 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
2754 otherwise just check whether one already exists. Returns -1 on error,
2755 1 if a DT_NEEDED tag already exists, and 0 on success. */
2758 elf_add_dt_needed_tag (bfd
*abfd
,
2759 struct bfd_link_info
*info
,
2763 struct elf_link_hash_table
*hash_table
;
2764 bfd_size_type oldsize
;
2765 bfd_size_type strindex
;
2767 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
2770 hash_table
= elf_hash_table (info
);
2771 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2772 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
2773 if (strindex
== (bfd_size_type
) -1)
2776 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2779 const struct elf_backend_data
*bed
;
2782 bed
= get_elf_backend_data (hash_table
->dynobj
);
2783 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
2785 for (extdyn
= sdyn
->contents
;
2786 extdyn
< sdyn
->contents
+ sdyn
->size
;
2787 extdyn
+= bed
->s
->sizeof_dyn
)
2789 Elf_Internal_Dyn dyn
;
2791 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
2792 if (dyn
.d_tag
== DT_NEEDED
2793 && dyn
.d_un
.d_val
== strindex
)
2795 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2803 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
2806 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2810 /* We were just checking for existence of the tag. */
2811 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
2816 /* Called via elf_link_hash_traverse, elf_smash_syms sets all symbols
2817 belonging to NOT_NEEDED to bfd_link_hash_new. We know there are no
2818 references from regular objects to these symbols.
2820 ??? Should we do something about references from other dynamic
2821 obects? If not, we potentially lose some warnings about undefined
2822 symbols. But how can we recover the initial undefined / undefweak
2825 struct elf_smash_syms_data
2828 struct elf_link_hash_table
*htab
;
2829 bfd_boolean twiddled
;
2833 elf_smash_syms (struct elf_link_hash_entry
*h
, void *data
)
2835 struct elf_smash_syms_data
*inf
= (struct elf_smash_syms_data
*) data
;
2836 struct bfd_link_hash_entry
*bh
;
2838 switch (h
->root
.type
)
2841 case bfd_link_hash_new
:
2844 case bfd_link_hash_undefined
:
2845 if (h
->root
.u
.undef
.abfd
!= inf
->not_needed
)
2847 if (h
->root
.u
.undef
.weak
!= NULL
2848 && h
->root
.u
.undef
.weak
!= inf
->not_needed
)
2850 /* Symbol was undefweak in u.undef.weak bfd, and has become
2851 undefined in as-needed lib. Restore weak. */
2852 h
->root
.type
= bfd_link_hash_undefweak
;
2853 h
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.weak
;
2854 if (h
->root
.u
.undef
.next
!= NULL
2855 || inf
->htab
->root
.undefs_tail
== &h
->root
)
2856 inf
->twiddled
= TRUE
;
2861 case bfd_link_hash_undefweak
:
2862 if (h
->root
.u
.undef
.abfd
!= inf
->not_needed
)
2866 case bfd_link_hash_defined
:
2867 case bfd_link_hash_defweak
:
2868 if (h
->root
.u
.def
.section
->owner
!= inf
->not_needed
)
2872 case bfd_link_hash_common
:
2873 if (h
->root
.u
.c
.p
->section
->owner
!= inf
->not_needed
)
2877 case bfd_link_hash_warning
:
2878 case bfd_link_hash_indirect
:
2879 elf_smash_syms ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
);
2880 if (h
->root
.u
.i
.link
->type
!= bfd_link_hash_new
)
2882 if (h
->root
.u
.i
.link
->u
.undef
.abfd
!= inf
->not_needed
)
2887 /* There is no way we can undo symbol table state from defined or
2888 defweak back to undefined. */
2892 /* Set sym back to newly created state, but keep undefs list pointer. */
2893 bh
= h
->root
.u
.undef
.next
;
2894 if (bh
!= NULL
|| inf
->htab
->root
.undefs_tail
== &h
->root
)
2895 inf
->twiddled
= TRUE
;
2896 (*inf
->htab
->root
.table
.newfunc
) (&h
->root
.root
,
2897 &inf
->htab
->root
.table
,
2898 h
->root
.root
.string
);
2899 h
->root
.u
.undef
.next
= bh
;
2900 h
->root
.u
.undef
.abfd
= inf
->not_needed
;
2905 /* Sort symbol by value and section. */
2907 elf_sort_symbol (const void *arg1
, const void *arg2
)
2909 const struct elf_link_hash_entry
*h1
;
2910 const struct elf_link_hash_entry
*h2
;
2911 bfd_signed_vma vdiff
;
2913 h1
= *(const struct elf_link_hash_entry
**) arg1
;
2914 h2
= *(const struct elf_link_hash_entry
**) arg2
;
2915 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
2917 return vdiff
> 0 ? 1 : -1;
2920 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
2922 return sdiff
> 0 ? 1 : -1;
2927 /* This function is used to adjust offsets into .dynstr for
2928 dynamic symbols. This is called via elf_link_hash_traverse. */
2931 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
2933 struct elf_strtab_hash
*dynstr
= data
;
2935 if (h
->root
.type
== bfd_link_hash_warning
)
2936 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2938 if (h
->dynindx
!= -1)
2939 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
2943 /* Assign string offsets in .dynstr, update all structures referencing
2947 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
2949 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
2950 struct elf_link_local_dynamic_entry
*entry
;
2951 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
2952 bfd
*dynobj
= hash_table
->dynobj
;
2955 const struct elf_backend_data
*bed
;
2958 _bfd_elf_strtab_finalize (dynstr
);
2959 size
= _bfd_elf_strtab_size (dynstr
);
2961 bed
= get_elf_backend_data (dynobj
);
2962 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2963 BFD_ASSERT (sdyn
!= NULL
);
2965 /* Update all .dynamic entries referencing .dynstr strings. */
2966 for (extdyn
= sdyn
->contents
;
2967 extdyn
< sdyn
->contents
+ sdyn
->size
;
2968 extdyn
+= bed
->s
->sizeof_dyn
)
2970 Elf_Internal_Dyn dyn
;
2972 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
2976 dyn
.d_un
.d_val
= size
;
2984 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
2989 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
2992 /* Now update local dynamic symbols. */
2993 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
2994 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
2995 entry
->isym
.st_name
);
2997 /* And the rest of dynamic symbols. */
2998 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3000 /* Adjust version definitions. */
3001 if (elf_tdata (output_bfd
)->cverdefs
)
3006 Elf_Internal_Verdef def
;
3007 Elf_Internal_Verdaux defaux
;
3009 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3013 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3015 p
+= sizeof (Elf_External_Verdef
);
3016 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3018 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3020 _bfd_elf_swap_verdaux_in (output_bfd
,
3021 (Elf_External_Verdaux
*) p
, &defaux
);
3022 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3024 _bfd_elf_swap_verdaux_out (output_bfd
,
3025 &defaux
, (Elf_External_Verdaux
*) p
);
3026 p
+= sizeof (Elf_External_Verdaux
);
3029 while (def
.vd_next
);
3032 /* Adjust version references. */
3033 if (elf_tdata (output_bfd
)->verref
)
3038 Elf_Internal_Verneed need
;
3039 Elf_Internal_Vernaux needaux
;
3041 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3045 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3047 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3048 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3049 (Elf_External_Verneed
*) p
);
3050 p
+= sizeof (Elf_External_Verneed
);
3051 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3053 _bfd_elf_swap_vernaux_in (output_bfd
,
3054 (Elf_External_Vernaux
*) p
, &needaux
);
3055 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3057 _bfd_elf_swap_vernaux_out (output_bfd
,
3059 (Elf_External_Vernaux
*) p
);
3060 p
+= sizeof (Elf_External_Vernaux
);
3063 while (need
.vn_next
);
3069 /* Add symbols from an ELF object file to the linker hash table. */
3072 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3074 bfd_boolean (*add_symbol_hook
)
3075 (bfd
*, struct bfd_link_info
*, Elf_Internal_Sym
*,
3076 const char **, flagword
*, asection
**, bfd_vma
*);
3077 bfd_boolean (*check_relocs
)
3078 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
3079 bfd_boolean (*check_directives
)
3080 (bfd
*, struct bfd_link_info
*);
3081 bfd_boolean collect
;
3082 Elf_Internal_Shdr
*hdr
;
3083 bfd_size_type symcount
;
3084 bfd_size_type extsymcount
;
3085 bfd_size_type extsymoff
;
3086 struct elf_link_hash_entry
**sym_hash
;
3087 bfd_boolean dynamic
;
3088 Elf_External_Versym
*extversym
= NULL
;
3089 Elf_External_Versym
*ever
;
3090 struct elf_link_hash_entry
*weaks
;
3091 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3092 bfd_size_type nondeflt_vers_cnt
= 0;
3093 Elf_Internal_Sym
*isymbuf
= NULL
;
3094 Elf_Internal_Sym
*isym
;
3095 Elf_Internal_Sym
*isymend
;
3096 const struct elf_backend_data
*bed
;
3097 bfd_boolean add_needed
;
3098 struct elf_link_hash_table
* hash_table
;
3101 hash_table
= elf_hash_table (info
);
3103 bed
= get_elf_backend_data (abfd
);
3104 add_symbol_hook
= bed
->elf_add_symbol_hook
;
3105 collect
= bed
->collect
;
3107 if ((abfd
->flags
& DYNAMIC
) == 0)
3113 /* You can't use -r against a dynamic object. Also, there's no
3114 hope of using a dynamic object which does not exactly match
3115 the format of the output file. */
3116 if (info
->relocatable
3117 || !is_elf_hash_table (hash_table
)
3118 || hash_table
->root
.creator
!= abfd
->xvec
)
3120 if (info
->relocatable
)
3121 bfd_set_error (bfd_error_invalid_operation
);
3123 bfd_set_error (bfd_error_wrong_format
);
3128 /* As a GNU extension, any input sections which are named
3129 .gnu.warning.SYMBOL are treated as warning symbols for the given
3130 symbol. This differs from .gnu.warning sections, which generate
3131 warnings when they are included in an output file. */
3132 if (info
->executable
)
3136 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3140 name
= bfd_get_section_name (abfd
, s
);
3141 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
3145 bfd_size_type prefix_len
;
3146 const char * gnu_warning_prefix
= _("warning: ");
3148 name
+= sizeof ".gnu.warning." - 1;
3150 /* If this is a shared object, then look up the symbol
3151 in the hash table. If it is there, and it is already
3152 been defined, then we will not be using the entry
3153 from this shared object, so we don't need to warn.
3154 FIXME: If we see the definition in a regular object
3155 later on, we will warn, but we shouldn't. The only
3156 fix is to keep track of what warnings we are supposed
3157 to emit, and then handle them all at the end of the
3161 struct elf_link_hash_entry
*h
;
3163 h
= elf_link_hash_lookup (hash_table
, name
,
3164 FALSE
, FALSE
, TRUE
);
3166 /* FIXME: What about bfd_link_hash_common? */
3168 && (h
->root
.type
== bfd_link_hash_defined
3169 || h
->root
.type
== bfd_link_hash_defweak
))
3171 /* We don't want to issue this warning. Clobber
3172 the section size so that the warning does not
3173 get copied into the output file. */
3180 prefix_len
= strlen (gnu_warning_prefix
);
3181 msg
= bfd_alloc (abfd
, prefix_len
+ sz
+ 1);
3185 strcpy (msg
, gnu_warning_prefix
);
3186 if (! bfd_get_section_contents (abfd
, s
, msg
+ prefix_len
, 0, sz
))
3189 msg
[prefix_len
+ sz
] = '\0';
3191 if (! (_bfd_generic_link_add_one_symbol
3192 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3193 FALSE
, collect
, NULL
)))
3196 if (! info
->relocatable
)
3198 /* Clobber the section size so that the warning does
3199 not get copied into the output file. */
3209 /* If we are creating a shared library, create all the dynamic
3210 sections immediately. We need to attach them to something,
3211 so we attach them to this BFD, provided it is the right
3212 format. FIXME: If there are no input BFD's of the same
3213 format as the output, we can't make a shared library. */
3215 && is_elf_hash_table (hash_table
)
3216 && hash_table
->root
.creator
== abfd
->xvec
3217 && ! hash_table
->dynamic_sections_created
)
3219 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3223 else if (!is_elf_hash_table (hash_table
))
3228 const char *soname
= NULL
;
3229 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3232 /* ld --just-symbols and dynamic objects don't mix very well.
3233 Test for --just-symbols by looking at info set up by
3234 _bfd_elf_link_just_syms. */
3235 if ((s
= abfd
->sections
) != NULL
3236 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3239 /* If this dynamic lib was specified on the command line with
3240 --as-needed in effect, then we don't want to add a DT_NEEDED
3241 tag unless the lib is actually used. Similary for libs brought
3242 in by another lib's DT_NEEDED. When --no-add-needed is used
3243 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3244 any dynamic library in DT_NEEDED tags in the dynamic lib at
3246 add_needed
= (elf_dyn_lib_class (abfd
)
3247 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3248 | DYN_NO_NEEDED
)) == 0;
3250 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3256 unsigned long shlink
;
3258 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3259 goto error_free_dyn
;
3261 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3263 goto error_free_dyn
;
3264 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3266 for (extdyn
= dynbuf
;
3267 extdyn
< dynbuf
+ s
->size
;
3268 extdyn
+= bed
->s
->sizeof_dyn
)
3270 Elf_Internal_Dyn dyn
;
3272 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3273 if (dyn
.d_tag
== DT_SONAME
)
3275 unsigned int tagv
= dyn
.d_un
.d_val
;
3276 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3278 goto error_free_dyn
;
3280 if (dyn
.d_tag
== DT_NEEDED
)
3282 struct bfd_link_needed_list
*n
, **pn
;
3284 unsigned int tagv
= dyn
.d_un
.d_val
;
3286 amt
= sizeof (struct bfd_link_needed_list
);
3287 n
= bfd_alloc (abfd
, amt
);
3288 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3289 if (n
== NULL
|| fnm
== NULL
)
3290 goto error_free_dyn
;
3291 amt
= strlen (fnm
) + 1;
3292 anm
= bfd_alloc (abfd
, amt
);
3294 goto error_free_dyn
;
3295 memcpy (anm
, fnm
, amt
);
3299 for (pn
= & hash_table
->needed
;
3305 if (dyn
.d_tag
== DT_RUNPATH
)
3307 struct bfd_link_needed_list
*n
, **pn
;
3309 unsigned int tagv
= dyn
.d_un
.d_val
;
3311 amt
= sizeof (struct bfd_link_needed_list
);
3312 n
= bfd_alloc (abfd
, amt
);
3313 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3314 if (n
== NULL
|| fnm
== NULL
)
3315 goto error_free_dyn
;
3316 amt
= strlen (fnm
) + 1;
3317 anm
= bfd_alloc (abfd
, amt
);
3319 goto error_free_dyn
;
3320 memcpy (anm
, fnm
, amt
);
3324 for (pn
= & runpath
;
3330 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3331 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3333 struct bfd_link_needed_list
*n
, **pn
;
3335 unsigned int tagv
= dyn
.d_un
.d_val
;
3337 amt
= sizeof (struct bfd_link_needed_list
);
3338 n
= bfd_alloc (abfd
, amt
);
3339 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3340 if (n
== NULL
|| fnm
== NULL
)
3341 goto error_free_dyn
;
3342 amt
= strlen (fnm
) + 1;
3343 anm
= bfd_alloc (abfd
, amt
);
3350 memcpy (anm
, fnm
, amt
);
3365 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3366 frees all more recently bfd_alloc'd blocks as well. */
3372 struct bfd_link_needed_list
**pn
;
3373 for (pn
= & hash_table
->runpath
;
3380 /* We do not want to include any of the sections in a dynamic
3381 object in the output file. We hack by simply clobbering the
3382 list of sections in the BFD. This could be handled more
3383 cleanly by, say, a new section flag; the existing
3384 SEC_NEVER_LOAD flag is not the one we want, because that one
3385 still implies that the section takes up space in the output
3387 bfd_section_list_clear (abfd
);
3389 /* Find the name to use in a DT_NEEDED entry that refers to this
3390 object. If the object has a DT_SONAME entry, we use it.
3391 Otherwise, if the generic linker stuck something in
3392 elf_dt_name, we use that. Otherwise, we just use the file
3394 if (soname
== NULL
|| *soname
== '\0')
3396 soname
= elf_dt_name (abfd
);
3397 if (soname
== NULL
|| *soname
== '\0')
3398 soname
= bfd_get_filename (abfd
);
3401 /* Save the SONAME because sometimes the linker emulation code
3402 will need to know it. */
3403 elf_dt_name (abfd
) = soname
;
3405 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3409 /* If we have already included this dynamic object in the
3410 link, just ignore it. There is no reason to include a
3411 particular dynamic object more than once. */
3416 /* If this is a dynamic object, we always link against the .dynsym
3417 symbol table, not the .symtab symbol table. The dynamic linker
3418 will only see the .dynsym symbol table, so there is no reason to
3419 look at .symtab for a dynamic object. */
3421 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3422 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3424 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3426 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3428 /* The sh_info field of the symtab header tells us where the
3429 external symbols start. We don't care about the local symbols at
3431 if (elf_bad_symtab (abfd
))
3433 extsymcount
= symcount
;
3438 extsymcount
= symcount
- hdr
->sh_info
;
3439 extsymoff
= hdr
->sh_info
;
3443 if (extsymcount
!= 0)
3445 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3447 if (isymbuf
== NULL
)
3450 /* We store a pointer to the hash table entry for each external
3452 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3453 sym_hash
= bfd_alloc (abfd
, amt
);
3454 if (sym_hash
== NULL
)
3455 goto error_free_sym
;
3456 elf_sym_hashes (abfd
) = sym_hash
;
3461 /* Read in any version definitions. */
3462 if (!_bfd_elf_slurp_version_tables (abfd
,
3463 info
->default_imported_symver
))
3464 goto error_free_sym
;
3466 /* Read in the symbol versions, but don't bother to convert them
3467 to internal format. */
3468 if (elf_dynversym (abfd
) != 0)
3470 Elf_Internal_Shdr
*versymhdr
;
3472 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3473 extversym
= bfd_malloc (versymhdr
->sh_size
);
3474 if (extversym
== NULL
)
3475 goto error_free_sym
;
3476 amt
= versymhdr
->sh_size
;
3477 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3478 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3479 goto error_free_vers
;
3485 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3486 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3488 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3495 struct elf_link_hash_entry
*h
;
3496 bfd_boolean definition
;
3497 bfd_boolean size_change_ok
;
3498 bfd_boolean type_change_ok
;
3499 bfd_boolean new_weakdef
;
3500 bfd_boolean override
;
3501 unsigned int old_alignment
;
3506 flags
= BSF_NO_FLAGS
;
3508 value
= isym
->st_value
;
3511 bind
= ELF_ST_BIND (isym
->st_info
);
3512 if (bind
== STB_LOCAL
)
3514 /* This should be impossible, since ELF requires that all
3515 global symbols follow all local symbols, and that sh_info
3516 point to the first global symbol. Unfortunately, Irix 5
3520 else if (bind
== STB_GLOBAL
)
3522 if (isym
->st_shndx
!= SHN_UNDEF
3523 && isym
->st_shndx
!= SHN_COMMON
)
3526 else if (bind
== STB_WEAK
)
3530 /* Leave it up to the processor backend. */
3533 if (isym
->st_shndx
== SHN_UNDEF
)
3534 sec
= bfd_und_section_ptr
;
3535 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
3537 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3539 sec
= bfd_abs_section_ptr
;
3540 else if (sec
->kept_section
)
3542 /* Symbols from discarded section are undefined. */
3543 sec
= bfd_und_section_ptr
;
3544 isym
->st_shndx
= SHN_UNDEF
;
3546 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3549 else if (isym
->st_shndx
== SHN_ABS
)
3550 sec
= bfd_abs_section_ptr
;
3551 else if (isym
->st_shndx
== SHN_COMMON
)
3553 sec
= bfd_com_section_ptr
;
3554 /* What ELF calls the size we call the value. What ELF
3555 calls the value we call the alignment. */
3556 value
= isym
->st_size
;
3560 /* Leave it up to the processor backend. */
3563 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3566 goto error_free_vers
;
3568 if (isym
->st_shndx
== SHN_COMMON
3569 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
3571 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3575 tcomm
= bfd_make_section (abfd
, ".tcommon");
3577 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
3579 | SEC_LINKER_CREATED
3580 | SEC_THREAD_LOCAL
)))
3581 goto error_free_vers
;
3585 else if (add_symbol_hook
)
3587 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
3589 goto error_free_vers
;
3591 /* The hook function sets the name to NULL if this symbol
3592 should be skipped for some reason. */
3597 /* Sanity check that all possibilities were handled. */
3600 bfd_set_error (bfd_error_bad_value
);
3601 goto error_free_vers
;
3604 if (bfd_is_und_section (sec
)
3605 || bfd_is_com_section (sec
))
3610 size_change_ok
= FALSE
;
3611 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
3615 if (is_elf_hash_table (hash_table
))
3617 Elf_Internal_Versym iver
;
3618 unsigned int vernum
= 0;
3623 if (info
->default_imported_symver
)
3624 /* Use the default symbol version created earlier. */
3625 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
3630 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
3632 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
3634 /* If this is a hidden symbol, or if it is not version
3635 1, we append the version name to the symbol name.
3636 However, we do not modify a non-hidden absolute
3637 symbol, because it might be the version symbol
3638 itself. FIXME: What if it isn't? */
3639 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
3640 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
3643 size_t namelen
, verlen
, newlen
;
3646 if (isym
->st_shndx
!= SHN_UNDEF
)
3648 if (vernum
> elf_tdata (abfd
)->cverdefs
)
3650 else if (vernum
> 1)
3652 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
3658 (*_bfd_error_handler
)
3659 (_("%B: %s: invalid version %u (max %d)"),
3661 elf_tdata (abfd
)->cverdefs
);
3662 bfd_set_error (bfd_error_bad_value
);
3663 goto error_free_vers
;
3668 /* We cannot simply test for the number of
3669 entries in the VERNEED section since the
3670 numbers for the needed versions do not start
3672 Elf_Internal_Verneed
*t
;
3675 for (t
= elf_tdata (abfd
)->verref
;
3679 Elf_Internal_Vernaux
*a
;
3681 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3683 if (a
->vna_other
== vernum
)
3685 verstr
= a
->vna_nodename
;
3694 (*_bfd_error_handler
)
3695 (_("%B: %s: invalid needed version %d"),
3696 abfd
, name
, vernum
);
3697 bfd_set_error (bfd_error_bad_value
);
3698 goto error_free_vers
;
3702 namelen
= strlen (name
);
3703 verlen
= strlen (verstr
);
3704 newlen
= namelen
+ verlen
+ 2;
3705 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3706 && isym
->st_shndx
!= SHN_UNDEF
)
3709 newname
= bfd_alloc (abfd
, newlen
);
3710 if (newname
== NULL
)
3711 goto error_free_vers
;
3712 memcpy (newname
, name
, namelen
);
3713 p
= newname
+ namelen
;
3715 /* If this is a defined non-hidden version symbol,
3716 we add another @ to the name. This indicates the
3717 default version of the symbol. */
3718 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
3719 && isym
->st_shndx
!= SHN_UNDEF
)
3721 memcpy (p
, verstr
, verlen
+ 1);
3726 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
3727 sym_hash
, &skip
, &override
,
3728 &type_change_ok
, &size_change_ok
))
3729 goto error_free_vers
;
3738 while (h
->root
.type
== bfd_link_hash_indirect
3739 || h
->root
.type
== bfd_link_hash_warning
)
3740 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3742 /* Remember the old alignment if this is a common symbol, so
3743 that we don't reduce the alignment later on. We can't
3744 check later, because _bfd_generic_link_add_one_symbol
3745 will set a default for the alignment which we want to
3746 override. We also remember the old bfd where the existing
3747 definition comes from. */
3748 switch (h
->root
.type
)
3753 case bfd_link_hash_defined
:
3754 case bfd_link_hash_defweak
:
3755 old_bfd
= h
->root
.u
.def
.section
->owner
;
3758 case bfd_link_hash_common
:
3759 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
3760 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
3764 if (elf_tdata (abfd
)->verdef
!= NULL
3768 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
3771 if (! (_bfd_generic_link_add_one_symbol
3772 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, collect
,
3773 (struct bfd_link_hash_entry
**) sym_hash
)))
3774 goto error_free_vers
;
3777 while (h
->root
.type
== bfd_link_hash_indirect
3778 || h
->root
.type
== bfd_link_hash_warning
)
3779 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3782 new_weakdef
= FALSE
;
3785 && (flags
& BSF_WEAK
) != 0
3786 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
3787 && is_elf_hash_table (hash_table
)
3788 && h
->u
.weakdef
== NULL
)
3790 /* Keep a list of all weak defined non function symbols from
3791 a dynamic object, using the weakdef field. Later in this
3792 function we will set the weakdef field to the correct
3793 value. We only put non-function symbols from dynamic
3794 objects on this list, because that happens to be the only
3795 time we need to know the normal symbol corresponding to a
3796 weak symbol, and the information is time consuming to
3797 figure out. If the weakdef field is not already NULL,
3798 then this symbol was already defined by some previous
3799 dynamic object, and we will be using that previous
3800 definition anyhow. */
3802 h
->u
.weakdef
= weaks
;
3807 /* Set the alignment of a common symbol. */
3808 if (isym
->st_shndx
== SHN_COMMON
3809 && h
->root
.type
== bfd_link_hash_common
)
3813 align
= bfd_log2 (isym
->st_value
);
3814 if (align
> old_alignment
3815 /* Permit an alignment power of zero if an alignment of one
3816 is specified and no other alignments have been specified. */
3817 || (isym
->st_value
== 1 && old_alignment
== 0))
3818 h
->root
.u
.c
.p
->alignment_power
= align
;
3820 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
3823 if (is_elf_hash_table (hash_table
))
3827 /* Check the alignment when a common symbol is involved. This
3828 can change when a common symbol is overridden by a normal
3829 definition or a common symbol is ignored due to the old
3830 normal definition. We need to make sure the maximum
3831 alignment is maintained. */
3832 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
3833 && h
->root
.type
!= bfd_link_hash_common
)
3835 unsigned int common_align
;
3836 unsigned int normal_align
;
3837 unsigned int symbol_align
;
3841 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
3842 if (h
->root
.u
.def
.section
->owner
!= NULL
3843 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3845 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
3846 if (normal_align
> symbol_align
)
3847 normal_align
= symbol_align
;
3850 normal_align
= symbol_align
;
3854 common_align
= old_alignment
;
3855 common_bfd
= old_bfd
;
3860 common_align
= bfd_log2 (isym
->st_value
);
3862 normal_bfd
= old_bfd
;
3865 if (normal_align
< common_align
)
3866 (*_bfd_error_handler
)
3867 (_("Warning: alignment %u of symbol `%s' in %B"
3868 " is smaller than %u in %B"),
3869 normal_bfd
, common_bfd
,
3870 1 << normal_align
, name
, 1 << common_align
);
3873 /* Remember the symbol size and type. */
3874 if (isym
->st_size
!= 0
3875 && (definition
|| h
->size
== 0))
3877 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
3878 (*_bfd_error_handler
)
3879 (_("Warning: size of symbol `%s' changed"
3880 " from %lu in %B to %lu in %B"),
3882 name
, (unsigned long) h
->size
,
3883 (unsigned long) isym
->st_size
);
3885 h
->size
= isym
->st_size
;
3888 /* If this is a common symbol, then we always want H->SIZE
3889 to be the size of the common symbol. The code just above
3890 won't fix the size if a common symbol becomes larger. We
3891 don't warn about a size change here, because that is
3892 covered by --warn-common. */
3893 if (h
->root
.type
== bfd_link_hash_common
)
3894 h
->size
= h
->root
.u
.c
.size
;
3896 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
3897 && (definition
|| h
->type
== STT_NOTYPE
))
3899 if (h
->type
!= STT_NOTYPE
3900 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
3901 && ! type_change_ok
)
3902 (*_bfd_error_handler
)
3903 (_("Warning: type of symbol `%s' changed"
3904 " from %d to %d in %B"),
3905 abfd
, name
, h
->type
, ELF_ST_TYPE (isym
->st_info
));
3907 h
->type
= ELF_ST_TYPE (isym
->st_info
);
3910 /* If st_other has a processor-specific meaning, specific
3911 code might be needed here. We never merge the visibility
3912 attribute with the one from a dynamic object. */
3913 if (bed
->elf_backend_merge_symbol_attribute
)
3914 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
3917 /* If this symbol has default visibility and the user has requested
3918 we not re-export it, then mark it as hidden. */
3919 if (definition
&& !dynamic
3921 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
3922 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
3923 isym
->st_other
= STV_HIDDEN
| (isym
->st_other
& ~ ELF_ST_VISIBILITY (-1));
3925 if (isym
->st_other
!= 0 && !dynamic
)
3927 unsigned char hvis
, symvis
, other
, nvis
;
3929 /* Take the balance of OTHER from the definition. */
3930 other
= (definition
? isym
->st_other
: h
->other
);
3931 other
&= ~ ELF_ST_VISIBILITY (-1);
3933 /* Combine visibilities, using the most constraining one. */
3934 hvis
= ELF_ST_VISIBILITY (h
->other
);
3935 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
3941 nvis
= hvis
< symvis
? hvis
: symvis
;
3943 h
->other
= other
| nvis
;
3946 /* Set a flag in the hash table entry indicating the type of
3947 reference or definition we just found. Keep a count of
3948 the number of dynamic symbols we find. A dynamic symbol
3949 is one which is referenced or defined by both a regular
3950 object and a shared object. */
3957 if (bind
!= STB_WEAK
)
3958 h
->ref_regular_nonweak
= 1;
3962 if (! info
->executable
3975 || (h
->u
.weakdef
!= NULL
3977 && h
->u
.weakdef
->dynindx
!= -1))
3981 /* Check to see if we need to add an indirect symbol for
3982 the default name. */
3983 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
3984 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
3985 &sec
, &value
, &dynsym
,
3987 goto error_free_vers
;
3989 if (definition
&& !dynamic
)
3991 char *p
= strchr (name
, ELF_VER_CHR
);
3992 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
3994 /* Queue non-default versions so that .symver x, x@FOO
3995 aliases can be checked. */
3996 if (! nondeflt_vers
)
3998 amt
= (isymend
- isym
+ 1)
3999 * sizeof (struct elf_link_hash_entry
*);
4000 nondeflt_vers
= bfd_malloc (amt
);
4002 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4006 if (dynsym
&& h
->dynindx
== -1)
4008 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4009 goto error_free_vers
;
4010 if (h
->u
.weakdef
!= NULL
4012 && h
->u
.weakdef
->dynindx
== -1)
4014 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4015 goto error_free_vers
;
4018 else if (dynsym
&& h
->dynindx
!= -1)
4019 /* If the symbol already has a dynamic index, but
4020 visibility says it should not be visible, turn it into
4022 switch (ELF_ST_VISIBILITY (h
->other
))
4026 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4037 const char *soname
= elf_dt_name (abfd
);
4039 /* A symbol from a library loaded via DT_NEEDED of some
4040 other library is referenced by a regular object.
4041 Add a DT_NEEDED entry for it. Issue an error if
4042 --no-add-needed is used. */
4043 if ((elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4045 (*_bfd_error_handler
)
4046 (_("%s: invalid DSO for symbol `%s' definition"),
4048 bfd_set_error (bfd_error_bad_value
);
4049 goto error_free_vers
;
4052 elf_dyn_lib_class (abfd
) &= ~DYN_AS_NEEDED
;
4055 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4057 goto error_free_vers
;
4059 BFD_ASSERT (ret
== 0);
4064 /* Now that all the symbols from this input file are created, handle
4065 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4066 if (nondeflt_vers
!= NULL
)
4068 bfd_size_type cnt
, symidx
;
4070 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4072 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4073 char *shortname
, *p
;
4075 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4077 || (h
->root
.type
!= bfd_link_hash_defined
4078 && h
->root
.type
!= bfd_link_hash_defweak
))
4081 amt
= p
- h
->root
.root
.string
;
4082 shortname
= bfd_malloc (amt
+ 1);
4083 memcpy (shortname
, h
->root
.root
.string
, amt
);
4084 shortname
[amt
] = '\0';
4086 hi
= (struct elf_link_hash_entry
*)
4087 bfd_link_hash_lookup (&hash_table
->root
, shortname
,
4088 FALSE
, FALSE
, FALSE
);
4090 && hi
->root
.type
== h
->root
.type
4091 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4092 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4094 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4095 hi
->root
.type
= bfd_link_hash_indirect
;
4096 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4097 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
4098 sym_hash
= elf_sym_hashes (abfd
);
4100 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4101 if (sym_hash
[symidx
] == hi
)
4103 sym_hash
[symidx
] = h
;
4109 free (nondeflt_vers
);
4110 nondeflt_vers
= NULL
;
4113 if (extversym
!= NULL
)
4119 if (isymbuf
!= NULL
)
4124 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4126 /* Remove symbols defined in an as-needed shared lib that wasn't
4128 struct elf_smash_syms_data inf
;
4129 inf
.not_needed
= abfd
;
4130 inf
.htab
= hash_table
;
4131 inf
.twiddled
= FALSE
;
4132 elf_link_hash_traverse (hash_table
, elf_smash_syms
, &inf
);
4134 bfd_link_repair_undef_list (&hash_table
->root
);
4138 /* Now set the weakdefs field correctly for all the weak defined
4139 symbols we found. The only way to do this is to search all the
4140 symbols. Since we only need the information for non functions in
4141 dynamic objects, that's the only time we actually put anything on
4142 the list WEAKS. We need this information so that if a regular
4143 object refers to a symbol defined weakly in a dynamic object, the
4144 real symbol in the dynamic object is also put in the dynamic
4145 symbols; we also must arrange for both symbols to point to the
4146 same memory location. We could handle the general case of symbol
4147 aliasing, but a general symbol alias can only be generated in
4148 assembler code, handling it correctly would be very time
4149 consuming, and other ELF linkers don't handle general aliasing
4153 struct elf_link_hash_entry
**hpp
;
4154 struct elf_link_hash_entry
**hppend
;
4155 struct elf_link_hash_entry
**sorted_sym_hash
;
4156 struct elf_link_hash_entry
*h
;
4159 /* Since we have to search the whole symbol list for each weak
4160 defined symbol, search time for N weak defined symbols will be
4161 O(N^2). Binary search will cut it down to O(NlogN). */
4162 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4163 sorted_sym_hash
= bfd_malloc (amt
);
4164 if (sorted_sym_hash
== NULL
)
4166 sym_hash
= sorted_sym_hash
;
4167 hpp
= elf_sym_hashes (abfd
);
4168 hppend
= hpp
+ extsymcount
;
4170 for (; hpp
< hppend
; hpp
++)
4174 && h
->root
.type
== bfd_link_hash_defined
4175 && h
->type
!= STT_FUNC
)
4183 qsort (sorted_sym_hash
, sym_count
,
4184 sizeof (struct elf_link_hash_entry
*),
4187 while (weaks
!= NULL
)
4189 struct elf_link_hash_entry
*hlook
;
4196 weaks
= hlook
->u
.weakdef
;
4197 hlook
->u
.weakdef
= NULL
;
4199 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4200 || hlook
->root
.type
== bfd_link_hash_defweak
4201 || hlook
->root
.type
== bfd_link_hash_common
4202 || hlook
->root
.type
== bfd_link_hash_indirect
);
4203 slook
= hlook
->root
.u
.def
.section
;
4204 vlook
= hlook
->root
.u
.def
.value
;
4211 bfd_signed_vma vdiff
;
4213 h
= sorted_sym_hash
[idx
];
4214 vdiff
= vlook
- h
->root
.u
.def
.value
;
4221 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4234 /* We didn't find a value/section match. */
4238 for (i
= ilook
; i
< sym_count
; i
++)
4240 h
= sorted_sym_hash
[i
];
4242 /* Stop if value or section doesn't match. */
4243 if (h
->root
.u
.def
.value
!= vlook
4244 || h
->root
.u
.def
.section
!= slook
)
4246 else if (h
!= hlook
)
4248 hlook
->u
.weakdef
= h
;
4250 /* If the weak definition is in the list of dynamic
4251 symbols, make sure the real definition is put
4253 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4255 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4259 /* If the real definition is in the list of dynamic
4260 symbols, make sure the weak definition is put
4261 there as well. If we don't do this, then the
4262 dynamic loader might not merge the entries for the
4263 real definition and the weak definition. */
4264 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4266 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4274 free (sorted_sym_hash
);
4277 check_directives
= get_elf_backend_data (abfd
)->check_directives
;
4278 if (check_directives
)
4279 check_directives (abfd
, info
);
4281 /* If this object is the same format as the output object, and it is
4282 not a shared library, then let the backend look through the
4285 This is required to build global offset table entries and to
4286 arrange for dynamic relocs. It is not required for the
4287 particular common case of linking non PIC code, even when linking
4288 against shared libraries, but unfortunately there is no way of
4289 knowing whether an object file has been compiled PIC or not.
4290 Looking through the relocs is not particularly time consuming.
4291 The problem is that we must either (1) keep the relocs in memory,
4292 which causes the linker to require additional runtime memory or
4293 (2) read the relocs twice from the input file, which wastes time.
4294 This would be a good case for using mmap.
4296 I have no idea how to handle linking PIC code into a file of a
4297 different format. It probably can't be done. */
4298 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
4300 && is_elf_hash_table (hash_table
)
4301 && hash_table
->root
.creator
== abfd
->xvec
4302 && check_relocs
!= NULL
)
4306 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4308 Elf_Internal_Rela
*internal_relocs
;
4311 if ((o
->flags
& SEC_RELOC
) == 0
4312 || o
->reloc_count
== 0
4313 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4314 && (o
->flags
& SEC_DEBUGGING
) != 0)
4315 || bfd_is_abs_section (o
->output_section
))
4318 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4320 if (internal_relocs
== NULL
)
4323 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
4325 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4326 free (internal_relocs
);
4333 /* If this is a non-traditional link, try to optimize the handling
4334 of the .stab/.stabstr sections. */
4336 && ! info
->traditional_format
4337 && is_elf_hash_table (hash_table
)
4338 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4342 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4343 if (stabstr
!= NULL
)
4345 bfd_size_type string_offset
= 0;
4348 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4349 if (strncmp (".stab", stab
->name
, 5) == 0
4350 && (!stab
->name
[5] ||
4351 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4352 && (stab
->flags
& SEC_MERGE
) == 0
4353 && !bfd_is_abs_section (stab
->output_section
))
4355 struct bfd_elf_section_data
*secdata
;
4357 secdata
= elf_section_data (stab
);
4358 if (! _bfd_link_section_stabs (abfd
,
4359 &hash_table
->stab_info
,
4364 if (secdata
->sec_info
)
4365 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4370 if (is_elf_hash_table (hash_table
) && add_needed
)
4372 /* Add this bfd to the loaded list. */
4373 struct elf_link_loaded_list
*n
;
4375 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4379 n
->next
= hash_table
->loaded
;
4380 hash_table
->loaded
= n
;
4386 if (nondeflt_vers
!= NULL
)
4387 free (nondeflt_vers
);
4388 if (extversym
!= NULL
)
4391 if (isymbuf
!= NULL
)
4397 /* Return the linker hash table entry of a symbol that might be
4398 satisfied by an archive symbol. Return -1 on error. */
4400 struct elf_link_hash_entry
*
4401 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4402 struct bfd_link_info
*info
,
4405 struct elf_link_hash_entry
*h
;
4409 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4413 /* If this is a default version (the name contains @@), look up the
4414 symbol again with only one `@' as well as without the version.
4415 The effect is that references to the symbol with and without the
4416 version will be matched by the default symbol in the archive. */
4418 p
= strchr (name
, ELF_VER_CHR
);
4419 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4422 /* First check with only one `@'. */
4423 len
= strlen (name
);
4424 copy
= bfd_alloc (abfd
, len
);
4426 return (struct elf_link_hash_entry
*) 0 - 1;
4428 first
= p
- name
+ 1;
4429 memcpy (copy
, name
, first
);
4430 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4432 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4435 /* We also need to check references to the symbol without the
4437 copy
[first
- 1] = '\0';
4438 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4439 FALSE
, FALSE
, FALSE
);
4442 bfd_release (abfd
, copy
);
4446 /* Add symbols from an ELF archive file to the linker hash table. We
4447 don't use _bfd_generic_link_add_archive_symbols because of a
4448 problem which arises on UnixWare. The UnixWare libc.so is an
4449 archive which includes an entry libc.so.1 which defines a bunch of
4450 symbols. The libc.so archive also includes a number of other
4451 object files, which also define symbols, some of which are the same
4452 as those defined in libc.so.1. Correct linking requires that we
4453 consider each object file in turn, and include it if it defines any
4454 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4455 this; it looks through the list of undefined symbols, and includes
4456 any object file which defines them. When this algorithm is used on
4457 UnixWare, it winds up pulling in libc.so.1 early and defining a
4458 bunch of symbols. This means that some of the other objects in the
4459 archive are not included in the link, which is incorrect since they
4460 precede libc.so.1 in the archive.
4462 Fortunately, ELF archive handling is simpler than that done by
4463 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4464 oddities. In ELF, if we find a symbol in the archive map, and the
4465 symbol is currently undefined, we know that we must pull in that
4468 Unfortunately, we do have to make multiple passes over the symbol
4469 table until nothing further is resolved. */
4472 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4475 bfd_boolean
*defined
= NULL
;
4476 bfd_boolean
*included
= NULL
;
4480 const struct elf_backend_data
*bed
;
4481 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4482 (bfd
*, struct bfd_link_info
*, const char *);
4484 if (! bfd_has_map (abfd
))
4486 /* An empty archive is a special case. */
4487 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4489 bfd_set_error (bfd_error_no_armap
);
4493 /* Keep track of all symbols we know to be already defined, and all
4494 files we know to be already included. This is to speed up the
4495 second and subsequent passes. */
4496 c
= bfd_ardata (abfd
)->symdef_count
;
4500 amt
*= sizeof (bfd_boolean
);
4501 defined
= bfd_zmalloc (amt
);
4502 included
= bfd_zmalloc (amt
);
4503 if (defined
== NULL
|| included
== NULL
)
4506 symdefs
= bfd_ardata (abfd
)->symdefs
;
4507 bed
= get_elf_backend_data (abfd
);
4508 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
4521 symdefend
= symdef
+ c
;
4522 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
4524 struct elf_link_hash_entry
*h
;
4526 struct bfd_link_hash_entry
*undefs_tail
;
4529 if (defined
[i
] || included
[i
])
4531 if (symdef
->file_offset
== last
)
4537 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
4538 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
4544 if (h
->root
.type
== bfd_link_hash_common
)
4546 /* We currently have a common symbol. The archive map contains
4547 a reference to this symbol, so we may want to include it. We
4548 only want to include it however, if this archive element
4549 contains a definition of the symbol, not just another common
4552 Unfortunately some archivers (including GNU ar) will put
4553 declarations of common symbols into their archive maps, as
4554 well as real definitions, so we cannot just go by the archive
4555 map alone. Instead we must read in the element's symbol
4556 table and check that to see what kind of symbol definition
4558 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
4561 else if (h
->root
.type
!= bfd_link_hash_undefined
)
4563 if (h
->root
.type
!= bfd_link_hash_undefweak
)
4568 /* We need to include this archive member. */
4569 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
4570 if (element
== NULL
)
4573 if (! bfd_check_format (element
, bfd_object
))
4576 /* Doublecheck that we have not included this object
4577 already--it should be impossible, but there may be
4578 something wrong with the archive. */
4579 if (element
->archive_pass
!= 0)
4581 bfd_set_error (bfd_error_bad_value
);
4584 element
->archive_pass
= 1;
4586 undefs_tail
= info
->hash
->undefs_tail
;
4588 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
4591 if (! bfd_link_add_symbols (element
, info
))
4594 /* If there are any new undefined symbols, we need to make
4595 another pass through the archive in order to see whether
4596 they can be defined. FIXME: This isn't perfect, because
4597 common symbols wind up on undefs_tail and because an
4598 undefined symbol which is defined later on in this pass
4599 does not require another pass. This isn't a bug, but it
4600 does make the code less efficient than it could be. */
4601 if (undefs_tail
!= info
->hash
->undefs_tail
)
4604 /* Look backward to mark all symbols from this object file
4605 which we have already seen in this pass. */
4609 included
[mark
] = TRUE
;
4614 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
4616 /* We mark subsequent symbols from this object file as we go
4617 on through the loop. */
4618 last
= symdef
->file_offset
;
4629 if (defined
!= NULL
)
4631 if (included
!= NULL
)
4636 /* Given an ELF BFD, add symbols to the global hash table as
4640 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4642 switch (bfd_get_format (abfd
))
4645 return elf_link_add_object_symbols (abfd
, info
);
4647 return elf_link_add_archive_symbols (abfd
, info
);
4649 bfd_set_error (bfd_error_wrong_format
);
4654 /* This function will be called though elf_link_hash_traverse to store
4655 all hash value of the exported symbols in an array. */
4658 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
4660 unsigned long **valuep
= data
;
4666 if (h
->root
.type
== bfd_link_hash_warning
)
4667 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4669 /* Ignore indirect symbols. These are added by the versioning code. */
4670 if (h
->dynindx
== -1)
4673 name
= h
->root
.root
.string
;
4674 p
= strchr (name
, ELF_VER_CHR
);
4677 alc
= bfd_malloc (p
- name
+ 1);
4678 memcpy (alc
, name
, p
- name
);
4679 alc
[p
- name
] = '\0';
4683 /* Compute the hash value. */
4684 ha
= bfd_elf_hash (name
);
4686 /* Store the found hash value in the array given as the argument. */
4689 /* And store it in the struct so that we can put it in the hash table
4691 h
->u
.elf_hash_value
= ha
;
4699 /* Array used to determine the number of hash table buckets to use
4700 based on the number of symbols there are. If there are fewer than
4701 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
4702 fewer than 37 we use 17 buckets, and so forth. We never use more
4703 than 32771 buckets. */
4705 static const size_t elf_buckets
[] =
4707 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
4711 /* Compute bucket count for hashing table. We do not use a static set
4712 of possible tables sizes anymore. Instead we determine for all
4713 possible reasonable sizes of the table the outcome (i.e., the
4714 number of collisions etc) and choose the best solution. The
4715 weighting functions are not too simple to allow the table to grow
4716 without bounds. Instead one of the weighting factors is the size.
4717 Therefore the result is always a good payoff between few collisions
4718 (= short chain lengths) and table size. */
4720 compute_bucket_count (struct bfd_link_info
*info
)
4722 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
4723 size_t best_size
= 0;
4724 unsigned long int *hashcodes
;
4725 unsigned long int *hashcodesp
;
4726 unsigned long int i
;
4729 /* Compute the hash values for all exported symbols. At the same
4730 time store the values in an array so that we could use them for
4733 amt
*= sizeof (unsigned long int);
4734 hashcodes
= bfd_malloc (amt
);
4735 if (hashcodes
== NULL
)
4737 hashcodesp
= hashcodes
;
4739 /* Put all hash values in HASHCODES. */
4740 elf_link_hash_traverse (elf_hash_table (info
),
4741 elf_collect_hash_codes
, &hashcodesp
);
4743 /* We have a problem here. The following code to optimize the table
4744 size requires an integer type with more the 32 bits. If
4745 BFD_HOST_U_64_BIT is set we know about such a type. */
4746 #ifdef BFD_HOST_U_64_BIT
4749 unsigned long int nsyms
= hashcodesp
- hashcodes
;
4752 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
4753 unsigned long int *counts
;
4754 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4755 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
4757 /* Possible optimization parameters: if we have NSYMS symbols we say
4758 that the hashing table must at least have NSYMS/4 and at most
4760 minsize
= nsyms
/ 4;
4763 best_size
= maxsize
= nsyms
* 2;
4765 /* Create array where we count the collisions in. We must use bfd_malloc
4766 since the size could be large. */
4768 amt
*= sizeof (unsigned long int);
4769 counts
= bfd_malloc (amt
);
4776 /* Compute the "optimal" size for the hash table. The criteria is a
4777 minimal chain length. The minor criteria is (of course) the size
4779 for (i
= minsize
; i
< maxsize
; ++i
)
4781 /* Walk through the array of hashcodes and count the collisions. */
4782 BFD_HOST_U_64_BIT max
;
4783 unsigned long int j
;
4784 unsigned long int fact
;
4786 memset (counts
, '\0', i
* sizeof (unsigned long int));
4788 /* Determine how often each hash bucket is used. */
4789 for (j
= 0; j
< nsyms
; ++j
)
4790 ++counts
[hashcodes
[j
] % i
];
4792 /* For the weight function we need some information about the
4793 pagesize on the target. This is information need not be 100%
4794 accurate. Since this information is not available (so far) we
4795 define it here to a reasonable default value. If it is crucial
4796 to have a better value some day simply define this value. */
4797 # ifndef BFD_TARGET_PAGESIZE
4798 # define BFD_TARGET_PAGESIZE (4096)
4801 /* We in any case need 2 + NSYMS entries for the size values and
4803 max
= (2 + nsyms
) * (bed
->s
->arch_size
/ 8);
4806 /* Variant 1: optimize for short chains. We add the squares
4807 of all the chain lengths (which favors many small chain
4808 over a few long chains). */
4809 for (j
= 0; j
< i
; ++j
)
4810 max
+= counts
[j
] * counts
[j
];
4812 /* This adds penalties for the overall size of the table. */
4813 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4816 /* Variant 2: Optimize a lot more for small table. Here we
4817 also add squares of the size but we also add penalties for
4818 empty slots (the +1 term). */
4819 for (j
= 0; j
< i
; ++j
)
4820 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
4822 /* The overall size of the table is considered, but not as
4823 strong as in variant 1, where it is squared. */
4824 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (bed
->s
->arch_size
/ 8)) + 1;
4828 /* Compare with current best results. */
4829 if (max
< best_chlen
)
4839 #endif /* defined (BFD_HOST_U_64_BIT) */
4841 /* This is the fallback solution if no 64bit type is available or if we
4842 are not supposed to spend much time on optimizations. We select the
4843 bucket count using a fixed set of numbers. */
4844 for (i
= 0; elf_buckets
[i
] != 0; i
++)
4846 best_size
= elf_buckets
[i
];
4847 if (dynsymcount
< elf_buckets
[i
+ 1])
4852 /* Free the arrays we needed. */
4858 /* Set up the sizes and contents of the ELF dynamic sections. This is
4859 called by the ELF linker emulation before_allocation routine. We
4860 must set the sizes of the sections before the linker sets the
4861 addresses of the various sections. */
4864 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
4867 const char *filter_shlib
,
4868 const char * const *auxiliary_filters
,
4869 struct bfd_link_info
*info
,
4870 asection
**sinterpptr
,
4871 struct bfd_elf_version_tree
*verdefs
)
4873 bfd_size_type soname_indx
;
4875 const struct elf_backend_data
*bed
;
4876 struct elf_assign_sym_version_info asvinfo
;
4880 soname_indx
= (bfd_size_type
) -1;
4882 if (!is_elf_hash_table (info
->hash
))
4885 elf_tdata (output_bfd
)->relro
= info
->relro
;
4886 if (info
->execstack
)
4887 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
4888 else if (info
->noexecstack
)
4889 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
4893 asection
*notesec
= NULL
;
4896 for (inputobj
= info
->input_bfds
;
4898 inputobj
= inputobj
->link_next
)
4902 if (inputobj
->flags
& DYNAMIC
)
4904 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
4907 if (s
->flags
& SEC_CODE
)
4916 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
4917 if (exec
&& info
->relocatable
4918 && notesec
->output_section
!= bfd_abs_section_ptr
)
4919 notesec
->output_section
->flags
|= SEC_CODE
;
4923 /* Any syms created from now on start with -1 in
4924 got.refcount/offset and plt.refcount/offset. */
4925 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
4927 /* The backend may have to create some sections regardless of whether
4928 we're dynamic or not. */
4929 bed
= get_elf_backend_data (output_bfd
);
4930 if (bed
->elf_backend_always_size_sections
4931 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
4934 dynobj
= elf_hash_table (info
)->dynobj
;
4936 /* If there were no dynamic objects in the link, there is nothing to
4941 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
4944 if (elf_hash_table (info
)->dynamic_sections_created
)
4946 struct elf_info_failed eif
;
4947 struct elf_link_hash_entry
*h
;
4949 struct bfd_elf_version_tree
*t
;
4950 struct bfd_elf_version_expr
*d
;
4951 bfd_boolean all_defined
;
4953 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
4954 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
4958 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4960 if (soname_indx
== (bfd_size_type
) -1
4961 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
4967 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
4969 info
->flags
|= DF_SYMBOLIC
;
4976 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
4978 if (indx
== (bfd_size_type
) -1
4979 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
4982 if (info
->new_dtags
)
4984 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
4985 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
4990 if (filter_shlib
!= NULL
)
4994 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
4995 filter_shlib
, TRUE
);
4996 if (indx
== (bfd_size_type
) -1
4997 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5001 if (auxiliary_filters
!= NULL
)
5003 const char * const *p
;
5005 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5009 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5011 if (indx
== (bfd_size_type
) -1
5012 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5018 eif
.verdefs
= verdefs
;
5021 /* If we are supposed to export all symbols into the dynamic symbol
5022 table (this is not the normal case), then do so. */
5023 if (info
->export_dynamic
)
5025 elf_link_hash_traverse (elf_hash_table (info
),
5026 _bfd_elf_export_symbol
,
5032 /* Make all global versions with definition. */
5033 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5034 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5035 if (!d
->symver
&& d
->symbol
)
5037 const char *verstr
, *name
;
5038 size_t namelen
, verlen
, newlen
;
5040 struct elf_link_hash_entry
*newh
;
5043 namelen
= strlen (name
);
5045 verlen
= strlen (verstr
);
5046 newlen
= namelen
+ verlen
+ 3;
5048 newname
= bfd_malloc (newlen
);
5049 if (newname
== NULL
)
5051 memcpy (newname
, name
, namelen
);
5053 /* Check the hidden versioned definition. */
5054 p
= newname
+ namelen
;
5056 memcpy (p
, verstr
, verlen
+ 1);
5057 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5058 newname
, FALSE
, FALSE
,
5061 || (newh
->root
.type
!= bfd_link_hash_defined
5062 && newh
->root
.type
!= bfd_link_hash_defweak
))
5064 /* Check the default versioned definition. */
5066 memcpy (p
, verstr
, verlen
+ 1);
5067 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5068 newname
, FALSE
, FALSE
,
5073 /* Mark this version if there is a definition and it is
5074 not defined in a shared object. */
5076 && !newh
->def_dynamic
5077 && (newh
->root
.type
== bfd_link_hash_defined
5078 || newh
->root
.type
== bfd_link_hash_defweak
))
5082 /* Attach all the symbols to their version information. */
5083 asvinfo
.output_bfd
= output_bfd
;
5084 asvinfo
.info
= info
;
5085 asvinfo
.verdefs
= verdefs
;
5086 asvinfo
.failed
= FALSE
;
5088 elf_link_hash_traverse (elf_hash_table (info
),
5089 _bfd_elf_link_assign_sym_version
,
5094 if (!info
->allow_undefined_version
)
5096 /* Check if all global versions have a definition. */
5098 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5099 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5100 if (!d
->symver
&& !d
->script
)
5102 (*_bfd_error_handler
)
5103 (_("%s: undefined version: %s"),
5104 d
->pattern
, t
->name
);
5105 all_defined
= FALSE
;
5110 bfd_set_error (bfd_error_bad_value
);
5115 /* Find all symbols which were defined in a dynamic object and make
5116 the backend pick a reasonable value for them. */
5117 elf_link_hash_traverse (elf_hash_table (info
),
5118 _bfd_elf_adjust_dynamic_symbol
,
5123 /* Add some entries to the .dynamic section. We fill in some of the
5124 values later, in bfd_elf_final_link, but we must add the entries
5125 now so that we know the final size of the .dynamic section. */
5127 /* If there are initialization and/or finalization functions to
5128 call then add the corresponding DT_INIT/DT_FINI entries. */
5129 h
= (info
->init_function
5130 ? elf_link_hash_lookup (elf_hash_table (info
),
5131 info
->init_function
, FALSE
,
5138 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5141 h
= (info
->fini_function
5142 ? elf_link_hash_lookup (elf_hash_table (info
),
5143 info
->fini_function
, FALSE
,
5150 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5154 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
5156 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5157 if (! info
->executable
)
5162 for (sub
= info
->input_bfds
; sub
!= NULL
;
5163 sub
= sub
->link_next
)
5164 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5165 if (elf_section_data (o
)->this_hdr
.sh_type
5166 == SHT_PREINIT_ARRAY
)
5168 (*_bfd_error_handler
)
5169 (_("%B: .preinit_array section is not allowed in DSO"),
5174 bfd_set_error (bfd_error_nonrepresentable_section
);
5178 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5179 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5182 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
5184 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5185 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5188 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
5190 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5191 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5195 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5196 /* If .dynstr is excluded from the link, we don't want any of
5197 these tags. Strictly, we should be checking each section
5198 individually; This quick check covers for the case where
5199 someone does a /DISCARD/ : { *(*) }. */
5200 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5202 bfd_size_type strsize
;
5204 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5205 if (!_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0)
5206 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5207 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5208 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5209 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5210 bed
->s
->sizeof_sym
))
5215 /* The backend must work out the sizes of all the other dynamic
5217 if (bed
->elf_backend_size_dynamic_sections
5218 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5221 if (elf_hash_table (info
)->dynamic_sections_created
)
5223 bfd_size_type dynsymcount
;
5225 size_t bucketcount
= 0;
5226 size_t hash_entry_size
;
5227 unsigned int dtagcount
;
5229 /* Set up the version definition section. */
5230 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5231 BFD_ASSERT (s
!= NULL
);
5233 /* We may have created additional version definitions if we are
5234 just linking a regular application. */
5235 verdefs
= asvinfo
.verdefs
;
5237 /* Skip anonymous version tag. */
5238 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5239 verdefs
= verdefs
->next
;
5241 if (verdefs
== NULL
&& !info
->create_default_symver
)
5242 _bfd_strip_section_from_output (info
, s
);
5247 struct bfd_elf_version_tree
*t
;
5249 Elf_Internal_Verdef def
;
5250 Elf_Internal_Verdaux defaux
;
5251 struct bfd_link_hash_entry
*bh
;
5252 struct elf_link_hash_entry
*h
;
5258 /* Make space for the base version. */
5259 size
+= sizeof (Elf_External_Verdef
);
5260 size
+= sizeof (Elf_External_Verdaux
);
5263 /* Make space for the default version. */
5264 if (info
->create_default_symver
)
5266 size
+= sizeof (Elf_External_Verdef
);
5270 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5272 struct bfd_elf_version_deps
*n
;
5274 size
+= sizeof (Elf_External_Verdef
);
5275 size
+= sizeof (Elf_External_Verdaux
);
5278 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5279 size
+= sizeof (Elf_External_Verdaux
);
5283 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5284 if (s
->contents
== NULL
&& s
->size
!= 0)
5287 /* Fill in the version definition section. */
5291 def
.vd_version
= VER_DEF_CURRENT
;
5292 def
.vd_flags
= VER_FLG_BASE
;
5295 if (info
->create_default_symver
)
5297 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5298 def
.vd_next
= sizeof (Elf_External_Verdef
);
5302 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5303 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5304 + sizeof (Elf_External_Verdaux
));
5307 if (soname_indx
!= (bfd_size_type
) -1)
5309 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5311 def
.vd_hash
= bfd_elf_hash (soname
);
5312 defaux
.vda_name
= soname_indx
;
5319 name
= basename (output_bfd
->filename
);
5320 def
.vd_hash
= bfd_elf_hash (name
);
5321 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5323 if (indx
== (bfd_size_type
) -1)
5325 defaux
.vda_name
= indx
;
5327 defaux
.vda_next
= 0;
5329 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5330 (Elf_External_Verdef
*) p
);
5331 p
+= sizeof (Elf_External_Verdef
);
5332 if (info
->create_default_symver
)
5334 /* Add a symbol representing this version. */
5336 if (! (_bfd_generic_link_add_one_symbol
5337 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5339 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5341 h
= (struct elf_link_hash_entry
*) bh
;
5344 h
->type
= STT_OBJECT
;
5345 h
->verinfo
.vertree
= NULL
;
5347 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5350 /* Create a duplicate of the base version with the same
5351 aux block, but different flags. */
5354 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5356 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5357 + sizeof (Elf_External_Verdaux
));
5360 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5361 (Elf_External_Verdef
*) p
);
5362 p
+= sizeof (Elf_External_Verdef
);
5364 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5365 (Elf_External_Verdaux
*) p
);
5366 p
+= sizeof (Elf_External_Verdaux
);
5368 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5371 struct bfd_elf_version_deps
*n
;
5374 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5377 /* Add a symbol representing this version. */
5379 if (! (_bfd_generic_link_add_one_symbol
5380 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5382 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5384 h
= (struct elf_link_hash_entry
*) bh
;
5387 h
->type
= STT_OBJECT
;
5388 h
->verinfo
.vertree
= t
;
5390 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5393 def
.vd_version
= VER_DEF_CURRENT
;
5395 if (t
->globals
.list
== NULL
5396 && t
->locals
.list
== NULL
5398 def
.vd_flags
|= VER_FLG_WEAK
;
5399 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
5400 def
.vd_cnt
= cdeps
+ 1;
5401 def
.vd_hash
= bfd_elf_hash (t
->name
);
5402 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5404 if (t
->next
!= NULL
)
5405 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5406 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
5408 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5409 (Elf_External_Verdef
*) p
);
5410 p
+= sizeof (Elf_External_Verdef
);
5412 defaux
.vda_name
= h
->dynstr_index
;
5413 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5415 defaux
.vda_next
= 0;
5416 if (t
->deps
!= NULL
)
5417 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5418 t
->name_indx
= defaux
.vda_name
;
5420 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5421 (Elf_External_Verdaux
*) p
);
5422 p
+= sizeof (Elf_External_Verdaux
);
5424 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5426 if (n
->version_needed
== NULL
)
5428 /* This can happen if there was an error in the
5430 defaux
.vda_name
= 0;
5434 defaux
.vda_name
= n
->version_needed
->name_indx
;
5435 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5438 if (n
->next
== NULL
)
5439 defaux
.vda_next
= 0;
5441 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
5443 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
5444 (Elf_External_Verdaux
*) p
);
5445 p
+= sizeof (Elf_External_Verdaux
);
5449 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
5450 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
5453 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
5456 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
5458 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
5461 else if (info
->flags
& DF_BIND_NOW
)
5463 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
5469 if (info
->executable
)
5470 info
->flags_1
&= ~ (DF_1_INITFIRST
5473 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
5477 /* Work out the size of the version reference section. */
5479 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
5480 BFD_ASSERT (s
!= NULL
);
5482 struct elf_find_verdep_info sinfo
;
5484 sinfo
.output_bfd
= output_bfd
;
5486 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
5487 if (sinfo
.vers
== 0)
5489 sinfo
.failed
= FALSE
;
5491 elf_link_hash_traverse (elf_hash_table (info
),
5492 _bfd_elf_link_find_version_dependencies
,
5495 if (elf_tdata (output_bfd
)->verref
== NULL
)
5496 _bfd_strip_section_from_output (info
, s
);
5499 Elf_Internal_Verneed
*t
;
5504 /* Build the version definition section. */
5507 for (t
= elf_tdata (output_bfd
)->verref
;
5511 Elf_Internal_Vernaux
*a
;
5513 size
+= sizeof (Elf_External_Verneed
);
5515 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5516 size
+= sizeof (Elf_External_Vernaux
);
5520 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5521 if (s
->contents
== NULL
)
5525 for (t
= elf_tdata (output_bfd
)->verref
;
5530 Elf_Internal_Vernaux
*a
;
5534 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5537 t
->vn_version
= VER_NEED_CURRENT
;
5539 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5540 elf_dt_name (t
->vn_bfd
) != NULL
5541 ? elf_dt_name (t
->vn_bfd
)
5542 : basename (t
->vn_bfd
->filename
),
5544 if (indx
== (bfd_size_type
) -1)
5547 t
->vn_aux
= sizeof (Elf_External_Verneed
);
5548 if (t
->vn_nextref
== NULL
)
5551 t
->vn_next
= (sizeof (Elf_External_Verneed
)
5552 + caux
* sizeof (Elf_External_Vernaux
));
5554 _bfd_elf_swap_verneed_out (output_bfd
, t
,
5555 (Elf_External_Verneed
*) p
);
5556 p
+= sizeof (Elf_External_Verneed
);
5558 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5560 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
5561 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5562 a
->vna_nodename
, FALSE
);
5563 if (indx
== (bfd_size_type
) -1)
5566 if (a
->vna_nextptr
== NULL
)
5569 a
->vna_next
= sizeof (Elf_External_Vernaux
);
5571 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
5572 (Elf_External_Vernaux
*) p
);
5573 p
+= sizeof (Elf_External_Vernaux
);
5577 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
5578 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
5581 elf_tdata (output_bfd
)->cverrefs
= crefs
;
5585 /* Assign dynsym indicies. In a shared library we generate a
5586 section symbol for each output section, which come first.
5587 Next come all of the back-end allocated local dynamic syms,
5588 followed by the rest of the global symbols. */
5590 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5592 /* Work out the size of the symbol version section. */
5593 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
5594 BFD_ASSERT (s
!= NULL
);
5595 if (dynsymcount
== 0
5596 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
5597 && !info
->create_default_symver
))
5599 _bfd_strip_section_from_output (info
, s
);
5600 /* The DYNSYMCOUNT might have changed if we were going to
5601 output a dynamic symbol table entry for S. */
5602 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
5606 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
5607 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5608 if (s
->contents
== NULL
)
5611 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
5615 /* Set the size of the .dynsym and .hash sections. We counted
5616 the number of dynamic symbols in elf_link_add_object_symbols.
5617 We will build the contents of .dynsym and .hash when we build
5618 the final symbol table, because until then we do not know the
5619 correct value to give the symbols. We built the .dynstr
5620 section as we went along in elf_link_add_object_symbols. */
5621 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
5622 BFD_ASSERT (s
!= NULL
);
5623 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
5624 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5625 if (s
->contents
== NULL
&& s
->size
!= 0)
5628 if (dynsymcount
!= 0)
5630 Elf_Internal_Sym isym
;
5632 /* The first entry in .dynsym is a dummy symbol. */
5639 bed
->s
->swap_symbol_out (output_bfd
, &isym
, s
->contents
, 0);
5642 /* Compute the size of the hashing table. As a side effect this
5643 computes the hash values for all the names we export. */
5644 bucketcount
= compute_bucket_count (info
);
5646 s
= bfd_get_section_by_name (dynobj
, ".hash");
5647 BFD_ASSERT (s
!= NULL
);
5648 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
5649 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
5650 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
5651 if (s
->contents
== NULL
)
5654 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
5655 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
5656 s
->contents
+ hash_entry_size
);
5658 elf_hash_table (info
)->bucketcount
= bucketcount
;
5660 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
5661 BFD_ASSERT (s
!= NULL
);
5663 elf_finalize_dynstr (output_bfd
, info
);
5665 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5667 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
5668 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
5675 /* Final phase of ELF linker. */
5677 /* A structure we use to avoid passing large numbers of arguments. */
5679 struct elf_final_link_info
5681 /* General link information. */
5682 struct bfd_link_info
*info
;
5685 /* Symbol string table. */
5686 struct bfd_strtab_hash
*symstrtab
;
5687 /* .dynsym section. */
5688 asection
*dynsym_sec
;
5689 /* .hash section. */
5691 /* symbol version section (.gnu.version). */
5692 asection
*symver_sec
;
5693 /* Buffer large enough to hold contents of any section. */
5695 /* Buffer large enough to hold external relocs of any section. */
5696 void *external_relocs
;
5697 /* Buffer large enough to hold internal relocs of any section. */
5698 Elf_Internal_Rela
*internal_relocs
;
5699 /* Buffer large enough to hold external local symbols of any input
5701 bfd_byte
*external_syms
;
5702 /* And a buffer for symbol section indices. */
5703 Elf_External_Sym_Shndx
*locsym_shndx
;
5704 /* Buffer large enough to hold internal local symbols of any input
5706 Elf_Internal_Sym
*internal_syms
;
5707 /* Array large enough to hold a symbol index for each local symbol
5708 of any input BFD. */
5710 /* Array large enough to hold a section pointer for each local
5711 symbol of any input BFD. */
5712 asection
**sections
;
5713 /* Buffer to hold swapped out symbols. */
5715 /* And one for symbol section indices. */
5716 Elf_External_Sym_Shndx
*symshndxbuf
;
5717 /* Number of swapped out symbols in buffer. */
5718 size_t symbuf_count
;
5719 /* Number of symbols which fit in symbuf. */
5721 /* And same for symshndxbuf. */
5722 size_t shndxbuf_size
;
5725 /* This struct is used to pass information to elf_link_output_extsym. */
5727 struct elf_outext_info
5730 bfd_boolean localsyms
;
5731 struct elf_final_link_info
*finfo
;
5734 /* When performing a relocatable link, the input relocations are
5735 preserved. But, if they reference global symbols, the indices
5736 referenced must be updated. Update all the relocations in
5737 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
5740 elf_link_adjust_relocs (bfd
*abfd
,
5741 Elf_Internal_Shdr
*rel_hdr
,
5743 struct elf_link_hash_entry
**rel_hash
)
5746 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5748 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5749 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5750 bfd_vma r_type_mask
;
5753 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
5755 swap_in
= bed
->s
->swap_reloc_in
;
5756 swap_out
= bed
->s
->swap_reloc_out
;
5758 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
5760 swap_in
= bed
->s
->swap_reloca_in
;
5761 swap_out
= bed
->s
->swap_reloca_out
;
5766 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
5769 if (bed
->s
->arch_size
== 32)
5776 r_type_mask
= 0xffffffff;
5780 erela
= rel_hdr
->contents
;
5781 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
5783 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
5786 if (*rel_hash
== NULL
)
5789 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
5791 (*swap_in
) (abfd
, erela
, irela
);
5792 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
5793 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
5794 | (irela
[j
].r_info
& r_type_mask
));
5795 (*swap_out
) (abfd
, irela
, erela
);
5799 struct elf_link_sort_rela
5805 enum elf_reloc_type_class type
;
5806 /* We use this as an array of size int_rels_per_ext_rel. */
5807 Elf_Internal_Rela rela
[1];
5811 elf_link_sort_cmp1 (const void *A
, const void *B
)
5813 const struct elf_link_sort_rela
*a
= A
;
5814 const struct elf_link_sort_rela
*b
= B
;
5815 int relativea
, relativeb
;
5817 relativea
= a
->type
== reloc_class_relative
;
5818 relativeb
= b
->type
== reloc_class_relative
;
5820 if (relativea
< relativeb
)
5822 if (relativea
> relativeb
)
5824 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
5826 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
5828 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5830 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5836 elf_link_sort_cmp2 (const void *A
, const void *B
)
5838 const struct elf_link_sort_rela
*a
= A
;
5839 const struct elf_link_sort_rela
*b
= B
;
5842 if (a
->u
.offset
< b
->u
.offset
)
5844 if (a
->u
.offset
> b
->u
.offset
)
5846 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
5847 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
5852 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
5854 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
5860 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
5863 bfd_size_type count
, size
;
5864 size_t i
, ret
, sort_elt
, ext_size
;
5865 bfd_byte
*sort
, *s_non_relative
, *p
;
5866 struct elf_link_sort_rela
*sq
;
5867 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5868 int i2e
= bed
->s
->int_rels_per_ext_rel
;
5869 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
5870 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
5871 struct bfd_link_order
*lo
;
5874 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
5875 if (reldyn
== NULL
|| reldyn
->size
== 0)
5877 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
5878 if (reldyn
== NULL
|| reldyn
->size
== 0)
5880 ext_size
= bed
->s
->sizeof_rel
;
5881 swap_in
= bed
->s
->swap_reloc_in
;
5882 swap_out
= bed
->s
->swap_reloc_out
;
5886 ext_size
= bed
->s
->sizeof_rela
;
5887 swap_in
= bed
->s
->swap_reloca_in
;
5888 swap_out
= bed
->s
->swap_reloca_out
;
5890 count
= reldyn
->size
/ ext_size
;
5893 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5894 if (lo
->type
== bfd_indirect_link_order
)
5896 asection
*o
= lo
->u
.indirect
.section
;
5900 if (size
!= reldyn
->size
)
5903 sort_elt
= (sizeof (struct elf_link_sort_rela
)
5904 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
5905 sort
= bfd_zmalloc (sort_elt
* count
);
5908 (*info
->callbacks
->warning
)
5909 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
5913 if (bed
->s
->arch_size
== 32)
5914 r_sym_mask
= ~(bfd_vma
) 0xff;
5916 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
5918 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5919 if (lo
->type
== bfd_indirect_link_order
)
5921 bfd_byte
*erel
, *erelend
;
5922 asection
*o
= lo
->u
.indirect
.section
;
5924 if (o
->contents
== NULL
&& o
->size
!= 0)
5926 /* This is a reloc section that is being handled as a normal
5927 section. See bfd_section_from_shdr. We can't combine
5928 relocs in this case. */
5933 erelend
= o
->contents
+ o
->size
;
5934 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5935 while (erel
< erelend
)
5937 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5938 (*swap_in
) (abfd
, erel
, s
->rela
);
5939 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
5940 s
->u
.sym_mask
= r_sym_mask
;
5946 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
5948 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
5950 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5951 if (s
->type
!= reloc_class_relative
)
5957 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
5958 for (; i
< count
; i
++, p
+= sort_elt
)
5960 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
5961 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
5963 sp
->u
.offset
= sq
->rela
->r_offset
;
5966 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
5968 for (lo
= reldyn
->link_order_head
; lo
!= NULL
; lo
= lo
->next
)
5969 if (lo
->type
== bfd_indirect_link_order
)
5971 bfd_byte
*erel
, *erelend
;
5972 asection
*o
= lo
->u
.indirect
.section
;
5975 erelend
= o
->contents
+ o
->size
;
5976 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
5977 while (erel
< erelend
)
5979 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
5980 (*swap_out
) (abfd
, s
->rela
, erel
);
5991 /* Flush the output symbols to the file. */
5994 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
5995 const struct elf_backend_data
*bed
)
5997 if (finfo
->symbuf_count
> 0)
5999 Elf_Internal_Shdr
*hdr
;
6003 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
6004 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
6005 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
6006 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
6007 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
6010 hdr
->sh_size
+= amt
;
6011 finfo
->symbuf_count
= 0;
6017 /* Add a symbol to the output symbol table. */
6020 elf_link_output_sym (struct elf_final_link_info
*finfo
,
6022 Elf_Internal_Sym
*elfsym
,
6023 asection
*input_sec
,
6024 struct elf_link_hash_entry
*h
)
6027 Elf_External_Sym_Shndx
*destshndx
;
6028 bfd_boolean (*output_symbol_hook
)
6029 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
6030 struct elf_link_hash_entry
*);
6031 const struct elf_backend_data
*bed
;
6033 bed
= get_elf_backend_data (finfo
->output_bfd
);
6034 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
6035 if (output_symbol_hook
!= NULL
)
6037 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
6041 if (name
== NULL
|| *name
== '\0')
6042 elfsym
->st_name
= 0;
6043 else if (input_sec
->flags
& SEC_EXCLUDE
)
6044 elfsym
->st_name
= 0;
6047 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
6049 if (elfsym
->st_name
== (unsigned long) -1)
6053 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
6055 if (! elf_link_flush_output_syms (finfo
, bed
))
6059 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
6060 destshndx
= finfo
->symshndxbuf
;
6061 if (destshndx
!= NULL
)
6063 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
6067 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
6068 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
6069 if (destshndx
== NULL
)
6071 memset ((char *) destshndx
+ amt
, 0, amt
);
6072 finfo
->shndxbuf_size
*= 2;
6074 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
6077 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
6078 finfo
->symbuf_count
+= 1;
6079 bfd_get_symcount (finfo
->output_bfd
) += 1;
6084 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
6085 allowing an unsatisfied unversioned symbol in the DSO to match a
6086 versioned symbol that would normally require an explicit version.
6087 We also handle the case that a DSO references a hidden symbol
6088 which may be satisfied by a versioned symbol in another DSO. */
6091 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
6092 const struct elf_backend_data
*bed
,
6093 struct elf_link_hash_entry
*h
)
6096 struct elf_link_loaded_list
*loaded
;
6098 if (!is_elf_hash_table (info
->hash
))
6101 switch (h
->root
.type
)
6107 case bfd_link_hash_undefined
:
6108 case bfd_link_hash_undefweak
:
6109 abfd
= h
->root
.u
.undef
.abfd
;
6110 if ((abfd
->flags
& DYNAMIC
) == 0
6111 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
6115 case bfd_link_hash_defined
:
6116 case bfd_link_hash_defweak
:
6117 abfd
= h
->root
.u
.def
.section
->owner
;
6120 case bfd_link_hash_common
:
6121 abfd
= h
->root
.u
.c
.p
->section
->owner
;
6124 BFD_ASSERT (abfd
!= NULL
);
6126 for (loaded
= elf_hash_table (info
)->loaded
;
6128 loaded
= loaded
->next
)
6131 Elf_Internal_Shdr
*hdr
;
6132 bfd_size_type symcount
;
6133 bfd_size_type extsymcount
;
6134 bfd_size_type extsymoff
;
6135 Elf_Internal_Shdr
*versymhdr
;
6136 Elf_Internal_Sym
*isym
;
6137 Elf_Internal_Sym
*isymend
;
6138 Elf_Internal_Sym
*isymbuf
;
6139 Elf_External_Versym
*ever
;
6140 Elf_External_Versym
*extversym
;
6142 input
= loaded
->abfd
;
6144 /* We check each DSO for a possible hidden versioned definition. */
6146 || (input
->flags
& DYNAMIC
) == 0
6147 || elf_dynversym (input
) == 0)
6150 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
6152 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6153 if (elf_bad_symtab (input
))
6155 extsymcount
= symcount
;
6160 extsymcount
= symcount
- hdr
->sh_info
;
6161 extsymoff
= hdr
->sh_info
;
6164 if (extsymcount
== 0)
6167 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
6169 if (isymbuf
== NULL
)
6172 /* Read in any version definitions. */
6173 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
6174 extversym
= bfd_malloc (versymhdr
->sh_size
);
6175 if (extversym
== NULL
)
6178 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
6179 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
6180 != versymhdr
->sh_size
))
6188 ever
= extversym
+ extsymoff
;
6189 isymend
= isymbuf
+ extsymcount
;
6190 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
6193 Elf_Internal_Versym iver
;
6194 unsigned short version_index
;
6196 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
6197 || isym
->st_shndx
== SHN_UNDEF
)
6200 name
= bfd_elf_string_from_elf_section (input
,
6203 if (strcmp (name
, h
->root
.root
.string
) != 0)
6206 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
6208 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
6210 /* If we have a non-hidden versioned sym, then it should
6211 have provided a definition for the undefined sym. */
6215 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
6216 if (version_index
== 1 || version_index
== 2)
6218 /* This is the base or first version. We can use it. */
6232 /* Add an external symbol to the symbol table. This is called from
6233 the hash table traversal routine. When generating a shared object,
6234 we go through the symbol table twice. The first time we output
6235 anything that might have been forced to local scope in a version
6236 script. The second time we output the symbols that are still
6240 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
6242 struct elf_outext_info
*eoinfo
= data
;
6243 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
6245 Elf_Internal_Sym sym
;
6246 asection
*input_sec
;
6247 const struct elf_backend_data
*bed
;
6249 if (h
->root
.type
== bfd_link_hash_warning
)
6251 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6252 if (h
->root
.type
== bfd_link_hash_new
)
6256 /* Decide whether to output this symbol in this pass. */
6257 if (eoinfo
->localsyms
)
6259 if (!h
->forced_local
)
6264 if (h
->forced_local
)
6268 bed
= get_elf_backend_data (finfo
->output_bfd
);
6270 /* If we have an undefined symbol reference here then it must have
6271 come from a shared library that is being linked in. (Undefined
6272 references in regular files have already been handled). If we
6273 are reporting errors for this situation then do so now. */
6274 if (h
->root
.type
== bfd_link_hash_undefined
6277 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
6278 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
6280 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6281 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
6282 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
6284 eoinfo
->failed
= TRUE
;
6289 /* We should also warn if a forced local symbol is referenced from
6290 shared libraries. */
6291 if (! finfo
->info
->relocatable
6292 && (! finfo
->info
->shared
)
6297 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
6299 (*_bfd_error_handler
)
6300 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
6301 finfo
->output_bfd
, h
->root
.u
.def
.section
->owner
,
6302 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
6304 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
6305 ? "hidden" : "local",
6306 h
->root
.root
.string
);
6307 eoinfo
->failed
= TRUE
;
6311 /* We don't want to output symbols that have never been mentioned by
6312 a regular file, or that we have been told to strip. However, if
6313 h->indx is set to -2, the symbol is used by a reloc and we must
6317 else if ((h
->def_dynamic
6319 || h
->root
.type
== bfd_link_hash_new
)
6323 else if (finfo
->info
->strip
== strip_all
)
6325 else if (finfo
->info
->strip
== strip_some
6326 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6327 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6329 else if (finfo
->info
->strip_discarded
6330 && (h
->root
.type
== bfd_link_hash_defined
6331 || h
->root
.type
== bfd_link_hash_defweak
)
6332 && elf_discarded_section (h
->root
.u
.def
.section
))
6337 /* If we're stripping it, and it's not a dynamic symbol, there's
6338 nothing else to do unless it is a forced local symbol. */
6341 && !h
->forced_local
)
6345 sym
.st_size
= h
->size
;
6346 sym
.st_other
= h
->other
;
6347 if (h
->forced_local
)
6348 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6349 else if (h
->root
.type
== bfd_link_hash_undefweak
6350 || h
->root
.type
== bfd_link_hash_defweak
)
6351 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6353 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6355 switch (h
->root
.type
)
6358 case bfd_link_hash_new
:
6359 case bfd_link_hash_warning
:
6363 case bfd_link_hash_undefined
:
6364 case bfd_link_hash_undefweak
:
6365 input_sec
= bfd_und_section_ptr
;
6366 sym
.st_shndx
= SHN_UNDEF
;
6369 case bfd_link_hash_defined
:
6370 case bfd_link_hash_defweak
:
6372 input_sec
= h
->root
.u
.def
.section
;
6373 if (input_sec
->output_section
!= NULL
)
6376 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6377 input_sec
->output_section
);
6378 if (sym
.st_shndx
== SHN_BAD
)
6380 (*_bfd_error_handler
)
6381 (_("%B: could not find output section %A for input section %A"),
6382 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
6383 eoinfo
->failed
= TRUE
;
6387 /* ELF symbols in relocatable files are section relative,
6388 but in nonrelocatable files they are virtual
6390 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6391 if (! finfo
->info
->relocatable
)
6393 sym
.st_value
+= input_sec
->output_section
->vma
;
6394 if (h
->type
== STT_TLS
)
6396 /* STT_TLS symbols are relative to PT_TLS segment
6398 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6399 sym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6405 BFD_ASSERT (input_sec
->owner
== NULL
6406 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6407 sym
.st_shndx
= SHN_UNDEF
;
6408 input_sec
= bfd_und_section_ptr
;
6413 case bfd_link_hash_common
:
6414 input_sec
= h
->root
.u
.c
.p
->section
;
6415 sym
.st_shndx
= SHN_COMMON
;
6416 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6419 case bfd_link_hash_indirect
:
6420 /* These symbols are created by symbol versioning. They point
6421 to the decorated version of the name. For example, if the
6422 symbol foo@@GNU_1.2 is the default, which should be used when
6423 foo is used with no version, then we add an indirect symbol
6424 foo which points to foo@@GNU_1.2. We ignore these symbols,
6425 since the indirected symbol is already in the hash table. */
6429 /* Give the processor backend a chance to tweak the symbol value,
6430 and also to finish up anything that needs to be done for this
6431 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6432 forced local syms when non-shared is due to a historical quirk. */
6433 if ((h
->dynindx
!= -1
6435 && ((finfo
->info
->shared
6436 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
6437 || h
->root
.type
!= bfd_link_hash_undefweak
))
6438 || !h
->forced_local
)
6439 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6441 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6442 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6444 eoinfo
->failed
= TRUE
;
6449 /* If we are marking the symbol as undefined, and there are no
6450 non-weak references to this symbol from a regular object, then
6451 mark the symbol as weak undefined; if there are non-weak
6452 references, mark the symbol as strong. We can't do this earlier,
6453 because it might not be marked as undefined until the
6454 finish_dynamic_symbol routine gets through with it. */
6455 if (sym
.st_shndx
== SHN_UNDEF
6457 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6458 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6462 if (h
->ref_regular_nonweak
)
6463 bindtype
= STB_GLOBAL
;
6465 bindtype
= STB_WEAK
;
6466 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6469 /* If a non-weak symbol with non-default visibility is not defined
6470 locally, it is a fatal error. */
6471 if (! finfo
->info
->relocatable
6472 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
6473 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
6474 && h
->root
.type
== bfd_link_hash_undefined
6477 (*_bfd_error_handler
)
6478 (_("%B: %s symbol `%s' isn't defined"),
6480 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
6482 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
6483 ? "internal" : "hidden",
6484 h
->root
.root
.string
);
6485 eoinfo
->failed
= TRUE
;
6489 /* If this symbol should be put in the .dynsym section, then put it
6490 there now. We already know the symbol index. We also fill in
6491 the entry in the .hash section. */
6492 if (h
->dynindx
!= -1
6493 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6497 size_t hash_entry_size
;
6498 bfd_byte
*bucketpos
;
6502 sym
.st_name
= h
->dynstr_index
;
6503 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
6504 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
6506 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6507 bucket
= h
->u
.elf_hash_value
% bucketcount
;
6509 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6510 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6511 + (bucket
+ 2) * hash_entry_size
);
6512 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6513 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
6514 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6515 ((bfd_byte
*) finfo
->hash_sec
->contents
6516 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6518 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6520 Elf_Internal_Versym iversym
;
6521 Elf_External_Versym
*eversym
;
6523 if (!h
->def_regular
)
6525 if (h
->verinfo
.verdef
== NULL
)
6526 iversym
.vs_vers
= 0;
6528 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6532 if (h
->verinfo
.vertree
== NULL
)
6533 iversym
.vs_vers
= 1;
6535 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6536 if (finfo
->info
->create_default_symver
)
6541 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6543 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6544 eversym
+= h
->dynindx
;
6545 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6549 /* If we're stripping it, then it was just a dynamic symbol, and
6550 there's nothing else to do. */
6551 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6554 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6556 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
6558 eoinfo
->failed
= TRUE
;
6565 /* Return TRUE if special handling is done for relocs in SEC against
6566 symbols defined in discarded sections. */
6569 elf_section_ignore_discarded_relocs (asection
*sec
)
6571 const struct elf_backend_data
*bed
;
6573 switch (sec
->sec_info_type
)
6575 case ELF_INFO_TYPE_STABS
:
6576 case ELF_INFO_TYPE_EH_FRAME
:
6582 bed
= get_elf_backend_data (sec
->owner
);
6583 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
6584 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
6590 enum action_discarded
6596 /* Return a mask saying how ld should treat relocations in SEC against
6597 symbols defined in discarded sections. If this function returns
6598 COMPLAIN set, ld will issue a warning message. If this function
6599 returns PRETEND set, and the discarded section was link-once and the
6600 same size as the kept link-once section, ld will pretend that the
6601 symbol was actually defined in the kept section. Otherwise ld will
6602 zero the reloc (at least that is the intent, but some cooperation by
6603 the target dependent code is needed, particularly for REL targets). */
6606 elf_action_discarded (asection
*sec
)
6608 if (sec
->flags
& SEC_DEBUGGING
)
6611 if (strcmp (".eh_frame", sec
->name
) == 0)
6614 if (strcmp (".gcc_except_table", sec
->name
) == 0)
6617 if (strcmp (".PARISC.unwind", sec
->name
) == 0)
6620 if (strcmp (".fixup", sec
->name
) == 0)
6623 return COMPLAIN
| PRETEND
;
6626 /* Find a match between a section and a member of a section group. */
6629 match_group_member (asection
*sec
, asection
*group
)
6631 asection
*first
= elf_next_in_group (group
);
6632 asection
*s
= first
;
6636 if (bfd_elf_match_symbols_in_sections (s
, sec
))
6646 /* Link an input file into the linker output file. This function
6647 handles all the sections and relocations of the input file at once.
6648 This is so that we only have to read the local symbols once, and
6649 don't have to keep them in memory. */
6652 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
6654 bfd_boolean (*relocate_section
)
6655 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6656 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
6658 Elf_Internal_Shdr
*symtab_hdr
;
6661 Elf_Internal_Sym
*isymbuf
;
6662 Elf_Internal_Sym
*isym
;
6663 Elf_Internal_Sym
*isymend
;
6665 asection
**ppsection
;
6667 const struct elf_backend_data
*bed
;
6668 bfd_boolean emit_relocs
;
6669 struct elf_link_hash_entry
**sym_hashes
;
6671 output_bfd
= finfo
->output_bfd
;
6672 bed
= get_elf_backend_data (output_bfd
);
6673 relocate_section
= bed
->elf_backend_relocate_section
;
6675 /* If this is a dynamic object, we don't want to do anything here:
6676 we don't want the local symbols, and we don't want the section
6678 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6681 emit_relocs
= (finfo
->info
->relocatable
6682 || finfo
->info
->emitrelocations
6683 || bed
->elf_backend_emit_relocs
);
6685 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6686 if (elf_bad_symtab (input_bfd
))
6688 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
6693 locsymcount
= symtab_hdr
->sh_info
;
6694 extsymoff
= symtab_hdr
->sh_info
;
6697 /* Read the local symbols. */
6698 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6699 if (isymbuf
== NULL
&& locsymcount
!= 0)
6701 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6702 finfo
->internal_syms
,
6703 finfo
->external_syms
,
6704 finfo
->locsym_shndx
);
6705 if (isymbuf
== NULL
)
6709 /* Find local symbol sections and adjust values of symbols in
6710 SEC_MERGE sections. Write out those local symbols we know are
6711 going into the output file. */
6712 isymend
= isymbuf
+ locsymcount
;
6713 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6715 isym
++, pindex
++, ppsection
++)
6719 Elf_Internal_Sym osym
;
6723 if (elf_bad_symtab (input_bfd
))
6725 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6732 if (isym
->st_shndx
== SHN_UNDEF
)
6733 isec
= bfd_und_section_ptr
;
6734 else if (isym
->st_shndx
< SHN_LORESERVE
6735 || isym
->st_shndx
> SHN_HIRESERVE
)
6737 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
6739 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6740 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6742 _bfd_merged_section_offset (output_bfd
, &isec
,
6743 elf_section_data (isec
)->sec_info
,
6746 else if (isym
->st_shndx
== SHN_ABS
)
6747 isec
= bfd_abs_section_ptr
;
6748 else if (isym
->st_shndx
== SHN_COMMON
)
6749 isec
= bfd_com_section_ptr
;
6758 /* Don't output the first, undefined, symbol. */
6759 if (ppsection
== finfo
->sections
)
6762 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6764 /* We never output section symbols. Instead, we use the
6765 section symbol of the corresponding section in the output
6770 /* If we are stripping all symbols, we don't want to output this
6772 if (finfo
->info
->strip
== strip_all
)
6775 /* If we are discarding all local symbols, we don't want to
6776 output this one. If we are generating a relocatable output
6777 file, then some of the local symbols may be required by
6778 relocs; we output them below as we discover that they are
6780 if (finfo
->info
->discard
== discard_all
)
6783 /* If this symbol is defined in a section which we are
6784 discarding, we don't need to keep it, but note that
6785 linker_mark is only reliable for sections that have contents.
6786 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6787 as well as linker_mark. */
6788 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6790 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6791 || (! finfo
->info
->relocatable
6792 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6795 /* Get the name of the symbol. */
6796 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6801 /* See if we are discarding symbols with this name. */
6802 if ((finfo
->info
->strip
== strip_some
6803 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6805 || (((finfo
->info
->discard
== discard_sec_merge
6806 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
6807 || finfo
->info
->discard
== discard_l
)
6808 && bfd_is_local_label_name (input_bfd
, name
)))
6811 /* If we get here, we are going to output this symbol. */
6815 /* Adjust the section index for the output file. */
6816 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6817 isec
->output_section
);
6818 if (osym
.st_shndx
== SHN_BAD
)
6821 *pindex
= bfd_get_symcount (output_bfd
);
6823 /* ELF symbols in relocatable files are section relative, but
6824 in executable files they are virtual addresses. Note that
6825 this code assumes that all ELF sections have an associated
6826 BFD section with a reasonable value for output_offset; below
6827 we assume that they also have a reasonable value for
6828 output_section. Any special sections must be set up to meet
6829 these requirements. */
6830 osym
.st_value
+= isec
->output_offset
;
6831 if (! finfo
->info
->relocatable
)
6833 osym
.st_value
+= isec
->output_section
->vma
;
6834 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6836 /* STT_TLS symbols are relative to PT_TLS segment base. */
6837 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
6838 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
6842 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
6846 /* Relocate the contents of each section. */
6847 sym_hashes
= elf_sym_hashes (input_bfd
);
6848 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6852 if (! o
->linker_mark
)
6854 /* This section was omitted from the link. */
6858 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6859 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6862 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6864 /* Section was created by _bfd_elf_link_create_dynamic_sections
6869 /* Get the contents of the section. They have been cached by a
6870 relaxation routine. Note that o is a section in an input
6871 file, so the contents field will not have been set by any of
6872 the routines which work on output files. */
6873 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6874 contents
= elf_section_data (o
)->this_hdr
.contents
;
6877 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
6879 contents
= finfo
->contents
;
6880 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
6884 if ((o
->flags
& SEC_RELOC
) != 0)
6886 Elf_Internal_Rela
*internal_relocs
;
6887 bfd_vma r_type_mask
;
6890 /* Get the swapped relocs. */
6892 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
6893 finfo
->internal_relocs
, FALSE
);
6894 if (internal_relocs
== NULL
6895 && o
->reloc_count
> 0)
6898 if (bed
->s
->arch_size
== 32)
6905 r_type_mask
= 0xffffffff;
6909 /* Run through the relocs looking for any against symbols
6910 from discarded sections and section symbols from
6911 removed link-once sections. Complain about relocs
6912 against discarded sections. Zero relocs against removed
6913 link-once sections. Preserve debug information as much
6915 if (!elf_section_ignore_discarded_relocs (o
))
6917 Elf_Internal_Rela
*rel
, *relend
;
6918 unsigned int action
= elf_action_discarded (o
);
6920 rel
= internal_relocs
;
6921 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6922 for ( ; rel
< relend
; rel
++)
6924 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
6925 asection
**ps
, *sec
;
6926 struct elf_link_hash_entry
*h
= NULL
;
6927 const char *sym_name
;
6929 if (r_symndx
== STN_UNDEF
)
6932 if (r_symndx
>= locsymcount
6933 || (elf_bad_symtab (input_bfd
)
6934 && finfo
->sections
[r_symndx
] == NULL
))
6936 h
= sym_hashes
[r_symndx
- extsymoff
];
6937 while (h
->root
.type
== bfd_link_hash_indirect
6938 || h
->root
.type
== bfd_link_hash_warning
)
6939 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6941 if (h
->root
.type
!= bfd_link_hash_defined
6942 && h
->root
.type
!= bfd_link_hash_defweak
)
6945 ps
= &h
->root
.u
.def
.section
;
6946 sym_name
= h
->root
.root
.string
;
6950 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
6951 ps
= &finfo
->sections
[r_symndx
];
6952 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
);
6955 /* Complain if the definition comes from a
6956 discarded section. */
6957 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
6961 BFD_ASSERT (r_symndx
!= 0);
6962 if (action
& COMPLAIN
)
6964 (*_bfd_error_handler
)
6965 (_("`%s' referenced in section `%A' of %B: "
6966 "defined in discarded section `%A' of %B\n"),
6967 o
, input_bfd
, sec
, sec
->owner
, sym_name
);
6970 /* Try to do the best we can to support buggy old
6971 versions of gcc. If we've warned, or this is
6972 debugging info, pretend that the symbol is
6973 really defined in the kept linkonce section.
6974 FIXME: This is quite broken. Modifying the
6975 symbol here means we will be changing all later
6976 uses of the symbol, not just in this section.
6977 The only thing that makes this half reasonable
6978 is that we warn in non-debug sections, and
6979 debug sections tend to come after other
6981 kept
= sec
->kept_section
;
6982 if (kept
!= NULL
&& (action
& PRETEND
))
6984 if (elf_sec_group (sec
) != NULL
)
6985 kept
= match_group_member (sec
, kept
);
6987 && sec
->size
== kept
->size
)
6994 /* Remove the symbol reference from the reloc, but
6995 don't kill the reloc completely. This is so that
6996 a zero value will be written into the section,
6997 which may have non-zero contents put there by the
6998 assembler. Zero in things like an eh_frame fde
6999 pc_begin allows stack unwinders to recognize the
7001 rel
->r_info
&= r_type_mask
;
7007 /* Relocate the section by invoking a back end routine.
7009 The back end routine is responsible for adjusting the
7010 section contents as necessary, and (if using Rela relocs
7011 and generating a relocatable output file) adjusting the
7012 reloc addend as necessary.
7014 The back end routine does not have to worry about setting
7015 the reloc address or the reloc symbol index.
7017 The back end routine is given a pointer to the swapped in
7018 internal symbols, and can access the hash table entries
7019 for the external symbols via elf_sym_hashes (input_bfd).
7021 When generating relocatable output, the back end routine
7022 must handle STB_LOCAL/STT_SECTION symbols specially. The
7023 output symbol is going to be a section symbol
7024 corresponding to the output section, which will require
7025 the addend to be adjusted. */
7027 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
7028 input_bfd
, o
, contents
,
7036 Elf_Internal_Rela
*irela
;
7037 Elf_Internal_Rela
*irelaend
;
7038 bfd_vma last_offset
;
7039 struct elf_link_hash_entry
**rel_hash
;
7040 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
7041 unsigned int next_erel
;
7042 bfd_boolean (*reloc_emitter
)
7043 (bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*);
7044 bfd_boolean rela_normal
;
7046 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
7047 rela_normal
= (bed
->rela_normal
7048 && (input_rel_hdr
->sh_entsize
7049 == bed
->s
->sizeof_rela
));
7051 /* Adjust the reloc addresses and symbol indices. */
7053 irela
= internal_relocs
;
7054 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7055 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
7056 + elf_section_data (o
->output_section
)->rel_count
7057 + elf_section_data (o
->output_section
)->rel_count2
);
7058 last_offset
= o
->output_offset
;
7059 if (!finfo
->info
->relocatable
)
7060 last_offset
+= o
->output_section
->vma
;
7061 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
7063 unsigned long r_symndx
;
7065 Elf_Internal_Sym sym
;
7067 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
7073 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
7076 if (irela
->r_offset
>= (bfd_vma
) -2)
7078 /* This is a reloc for a deleted entry or somesuch.
7079 Turn it into an R_*_NONE reloc, at the same
7080 offset as the last reloc. elf_eh_frame.c and
7081 elf_bfd_discard_info rely on reloc offsets
7083 irela
->r_offset
= last_offset
;
7085 irela
->r_addend
= 0;
7089 irela
->r_offset
+= o
->output_offset
;
7091 /* Relocs in an executable have to be virtual addresses. */
7092 if (!finfo
->info
->relocatable
)
7093 irela
->r_offset
+= o
->output_section
->vma
;
7095 last_offset
= irela
->r_offset
;
7097 r_symndx
= irela
->r_info
>> r_sym_shift
;
7098 if (r_symndx
== STN_UNDEF
)
7101 if (r_symndx
>= locsymcount
7102 || (elf_bad_symtab (input_bfd
)
7103 && finfo
->sections
[r_symndx
] == NULL
))
7105 struct elf_link_hash_entry
*rh
;
7108 /* This is a reloc against a global symbol. We
7109 have not yet output all the local symbols, so
7110 we do not know the symbol index of any global
7111 symbol. We set the rel_hash entry for this
7112 reloc to point to the global hash table entry
7113 for this symbol. The symbol index is then
7114 set at the end of bfd_elf_final_link. */
7115 indx
= r_symndx
- extsymoff
;
7116 rh
= elf_sym_hashes (input_bfd
)[indx
];
7117 while (rh
->root
.type
== bfd_link_hash_indirect
7118 || rh
->root
.type
== bfd_link_hash_warning
)
7119 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
7121 /* Setting the index to -2 tells
7122 elf_link_output_extsym that this symbol is
7124 BFD_ASSERT (rh
->indx
< 0);
7132 /* This is a reloc against a local symbol. */
7135 sym
= isymbuf
[r_symndx
];
7136 sec
= finfo
->sections
[r_symndx
];
7137 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
7139 /* I suppose the backend ought to fill in the
7140 section of any STT_SECTION symbol against a
7141 processor specific section. */
7143 if (bfd_is_abs_section (sec
))
7145 else if (sec
== NULL
|| sec
->owner
== NULL
)
7147 bfd_set_error (bfd_error_bad_value
);
7152 asection
*osec
= sec
->output_section
;
7154 /* If we have discarded a section, the output
7155 section will be the absolute section. In
7156 case of discarded link-once and discarded
7157 SEC_MERGE sections, use the kept section. */
7158 if (bfd_is_abs_section (osec
)
7159 && sec
->kept_section
!= NULL
7160 && sec
->kept_section
->output_section
!= NULL
)
7162 osec
= sec
->kept_section
->output_section
;
7163 irela
->r_addend
-= osec
->vma
;
7166 if (!bfd_is_abs_section (osec
))
7168 r_symndx
= osec
->target_index
;
7169 BFD_ASSERT (r_symndx
!= 0);
7173 /* Adjust the addend according to where the
7174 section winds up in the output section. */
7176 irela
->r_addend
+= sec
->output_offset
;
7180 if (finfo
->indices
[r_symndx
] == -1)
7182 unsigned long shlink
;
7186 if (finfo
->info
->strip
== strip_all
)
7188 /* You can't do ld -r -s. */
7189 bfd_set_error (bfd_error_invalid_operation
);
7193 /* This symbol was skipped earlier, but
7194 since it is needed by a reloc, we
7195 must output it now. */
7196 shlink
= symtab_hdr
->sh_link
;
7197 name
= (bfd_elf_string_from_elf_section
7198 (input_bfd
, shlink
, sym
.st_name
));
7202 osec
= sec
->output_section
;
7204 _bfd_elf_section_from_bfd_section (output_bfd
,
7206 if (sym
.st_shndx
== SHN_BAD
)
7209 sym
.st_value
+= sec
->output_offset
;
7210 if (! finfo
->info
->relocatable
)
7212 sym
.st_value
+= osec
->vma
;
7213 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
7215 /* STT_TLS symbols are relative to PT_TLS
7217 BFD_ASSERT (elf_hash_table (finfo
->info
)
7219 sym
.st_value
-= (elf_hash_table (finfo
->info
)
7224 finfo
->indices
[r_symndx
]
7225 = bfd_get_symcount (output_bfd
);
7227 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
7232 r_symndx
= finfo
->indices
[r_symndx
];
7235 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
7236 | (irela
->r_info
& r_type_mask
));
7239 /* Swap out the relocs. */
7240 if (bed
->elf_backend_emit_relocs
7241 && !(finfo
->info
->relocatable
7242 || finfo
->info
->emitrelocations
))
7243 reloc_emitter
= bed
->elf_backend_emit_relocs
;
7245 reloc_emitter
= _bfd_elf_link_output_relocs
;
7247 if (input_rel_hdr
->sh_size
!= 0
7248 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7252 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
7253 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
7255 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
7256 * bed
->s
->int_rels_per_ext_rel
);
7257 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
7264 /* Write out the modified section contents. */
7265 if (bed
->elf_backend_write_section
7266 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
7268 /* Section written out. */
7270 else switch (o
->sec_info_type
)
7272 case ELF_INFO_TYPE_STABS
:
7273 if (! (_bfd_write_section_stabs
7275 &elf_hash_table (finfo
->info
)->stab_info
,
7276 o
, &elf_section_data (o
)->sec_info
, contents
)))
7279 case ELF_INFO_TYPE_MERGE
:
7280 if (! _bfd_write_merged_section (output_bfd
, o
,
7281 elf_section_data (o
)->sec_info
))
7284 case ELF_INFO_TYPE_EH_FRAME
:
7286 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
7293 if (! (o
->flags
& SEC_EXCLUDE
)
7294 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
7296 (file_ptr
) o
->output_offset
,
7307 /* Generate a reloc when linking an ELF file. This is a reloc
7308 requested by the linker, and does come from any input file. This
7309 is used to build constructor and destructor tables when linking
7313 elf_reloc_link_order (bfd
*output_bfd
,
7314 struct bfd_link_info
*info
,
7315 asection
*output_section
,
7316 struct bfd_link_order
*link_order
)
7318 reloc_howto_type
*howto
;
7322 struct elf_link_hash_entry
**rel_hash_ptr
;
7323 Elf_Internal_Shdr
*rel_hdr
;
7324 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7325 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
7329 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7332 bfd_set_error (bfd_error_bad_value
);
7336 addend
= link_order
->u
.reloc
.p
->addend
;
7338 /* Figure out the symbol index. */
7339 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7340 + elf_section_data (output_section
)->rel_count
7341 + elf_section_data (output_section
)->rel_count2
);
7342 if (link_order
->type
== bfd_section_reloc_link_order
)
7344 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7345 BFD_ASSERT (indx
!= 0);
7346 *rel_hash_ptr
= NULL
;
7350 struct elf_link_hash_entry
*h
;
7352 /* Treat a reloc against a defined symbol as though it were
7353 actually against the section. */
7354 h
= ((struct elf_link_hash_entry
*)
7355 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7356 link_order
->u
.reloc
.p
->u
.name
,
7357 FALSE
, FALSE
, TRUE
));
7359 && (h
->root
.type
== bfd_link_hash_defined
7360 || h
->root
.type
== bfd_link_hash_defweak
))
7364 section
= h
->root
.u
.def
.section
;
7365 indx
= section
->output_section
->target_index
;
7366 *rel_hash_ptr
= NULL
;
7367 /* It seems that we ought to add the symbol value to the
7368 addend here, but in practice it has already been added
7369 because it was passed to constructor_callback. */
7370 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7374 /* Setting the index to -2 tells elf_link_output_extsym that
7375 this symbol is used by a reloc. */
7382 if (! ((*info
->callbacks
->unattached_reloc
)
7383 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
7389 /* If this is an inplace reloc, we must write the addend into the
7391 if (howto
->partial_inplace
&& addend
!= 0)
7394 bfd_reloc_status_type rstat
;
7397 const char *sym_name
;
7399 size
= bfd_get_reloc_size (howto
);
7400 buf
= bfd_zmalloc (size
);
7403 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
7410 case bfd_reloc_outofrange
:
7413 case bfd_reloc_overflow
:
7414 if (link_order
->type
== bfd_section_reloc_link_order
)
7415 sym_name
= bfd_section_name (output_bfd
,
7416 link_order
->u
.reloc
.p
->u
.section
);
7418 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7419 if (! ((*info
->callbacks
->reloc_overflow
)
7420 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
7421 NULL
, (bfd_vma
) 0)))
7428 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
7429 link_order
->offset
, size
);
7435 /* The address of a reloc is relative to the section in a
7436 relocatable file, and is a virtual address in an executable
7438 offset
= link_order
->offset
;
7439 if (! info
->relocatable
)
7440 offset
+= output_section
->vma
;
7442 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7444 irel
[i
].r_offset
= offset
;
7446 irel
[i
].r_addend
= 0;
7448 if (bed
->s
->arch_size
== 32)
7449 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
7451 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
7453 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7454 erel
= rel_hdr
->contents
;
7455 if (rel_hdr
->sh_type
== SHT_REL
)
7457 erel
+= (elf_section_data (output_section
)->rel_count
7458 * bed
->s
->sizeof_rel
);
7459 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7463 irel
[0].r_addend
= addend
;
7464 erel
+= (elf_section_data (output_section
)->rel_count
7465 * bed
->s
->sizeof_rela
);
7466 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7469 ++elf_section_data (output_section
)->rel_count
;
7475 /* Get the output vma of the section pointed to by the sh_link field. */
7478 elf_get_linked_section_vma (struct bfd_link_order
*p
)
7480 Elf_Internal_Shdr
**elf_shdrp
;
7484 s
= p
->u
.indirect
.section
;
7485 elf_shdrp
= elf_elfsections (s
->owner
);
7486 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
7487 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
7489 The Intel C compiler generates SHT_IA_64_UNWIND with
7490 SHF_LINK_ORDER. But it doesn't set theh sh_link or
7491 sh_info fields. Hence we could get the situation
7492 where elfsec is 0. */
7495 const struct elf_backend_data
*bed
7496 = get_elf_backend_data (s
->owner
);
7497 if (bed
->link_order_error_handler
)
7498 bed
->link_order_error_handler
7499 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
7504 s
= elf_shdrp
[elfsec
]->bfd_section
;
7505 return s
->output_section
->vma
+ s
->output_offset
;
7510 /* Compare two sections based on the locations of the sections they are
7511 linked to. Used by elf_fixup_link_order. */
7514 compare_link_order (const void * a
, const void * b
)
7519 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
7520 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
7527 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
7528 order as their linked sections. Returns false if this could not be done
7529 because an output section includes both ordered and unordered
7530 sections. Ideally we'd do this in the linker proper. */
7533 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
7538 struct bfd_link_order
*p
;
7540 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7542 struct bfd_link_order
**sections
;
7548 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7550 if (p
->type
== bfd_indirect_link_order
7551 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
7552 == bfd_target_elf_flavour
)
7553 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
7555 s
= p
->u
.indirect
.section
;
7556 elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
);
7558 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
)
7567 if (!seen_linkorder
)
7570 if (seen_other
&& seen_linkorder
)
7572 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
7574 bfd_set_error (bfd_error_bad_value
);
7578 sections
= (struct bfd_link_order
**)
7579 xmalloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
7582 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7584 sections
[seen_linkorder
++] = p
;
7586 /* Sort the input sections in the order of their linked section. */
7587 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
7588 compare_link_order
);
7590 /* Change the offsets of the sections. */
7592 for (n
= 0; n
< seen_linkorder
; n
++)
7594 s
= sections
[n
]->u
.indirect
.section
;
7595 offset
&= ~(bfd_vma
)((1 << s
->alignment_power
) - 1);
7596 s
->output_offset
= offset
;
7597 sections
[n
]->offset
= offset
;
7598 offset
+= sections
[n
]->size
;
7605 /* Do the final step of an ELF link. */
7608 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
7610 bfd_boolean dynamic
;
7611 bfd_boolean emit_relocs
;
7613 struct elf_final_link_info finfo
;
7614 register asection
*o
;
7615 register struct bfd_link_order
*p
;
7617 bfd_size_type max_contents_size
;
7618 bfd_size_type max_external_reloc_size
;
7619 bfd_size_type max_internal_reloc_count
;
7620 bfd_size_type max_sym_count
;
7621 bfd_size_type max_sym_shndx_count
;
7623 Elf_Internal_Sym elfsym
;
7625 Elf_Internal_Shdr
*symtab_hdr
;
7626 Elf_Internal_Shdr
*symtab_shndx_hdr
;
7627 Elf_Internal_Shdr
*symstrtab_hdr
;
7628 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7629 struct elf_outext_info eoinfo
;
7631 size_t relativecount
= 0;
7632 asection
*reldyn
= 0;
7635 if (! is_elf_hash_table (info
->hash
))
7639 abfd
->flags
|= DYNAMIC
;
7641 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
7642 dynobj
= elf_hash_table (info
)->dynobj
;
7644 emit_relocs
= (info
->relocatable
7645 || info
->emitrelocations
7646 || bed
->elf_backend_emit_relocs
);
7649 finfo
.output_bfd
= abfd
;
7650 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
7651 if (finfo
.symstrtab
== NULL
)
7656 finfo
.dynsym_sec
= NULL
;
7657 finfo
.hash_sec
= NULL
;
7658 finfo
.symver_sec
= NULL
;
7662 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
7663 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
7664 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
7665 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
7666 /* Note that it is OK if symver_sec is NULL. */
7669 finfo
.contents
= NULL
;
7670 finfo
.external_relocs
= NULL
;
7671 finfo
.internal_relocs
= NULL
;
7672 finfo
.external_syms
= NULL
;
7673 finfo
.locsym_shndx
= NULL
;
7674 finfo
.internal_syms
= NULL
;
7675 finfo
.indices
= NULL
;
7676 finfo
.sections
= NULL
;
7677 finfo
.symbuf
= NULL
;
7678 finfo
.symshndxbuf
= NULL
;
7679 finfo
.symbuf_count
= 0;
7680 finfo
.shndxbuf_size
= 0;
7682 /* Count up the number of relocations we will output for each output
7683 section, so that we know the sizes of the reloc sections. We
7684 also figure out some maximum sizes. */
7685 max_contents_size
= 0;
7686 max_external_reloc_size
= 0;
7687 max_internal_reloc_count
= 0;
7689 max_sym_shndx_count
= 0;
7691 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7693 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
7696 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
7698 unsigned int reloc_count
= 0;
7699 struct bfd_elf_section_data
*esdi
= NULL
;
7700 unsigned int *rel_count1
;
7702 if (p
->type
== bfd_section_reloc_link_order
7703 || p
->type
== bfd_symbol_reloc_link_order
)
7705 else if (p
->type
== bfd_indirect_link_order
)
7709 sec
= p
->u
.indirect
.section
;
7710 esdi
= elf_section_data (sec
);
7712 /* Mark all sections which are to be included in the
7713 link. This will normally be every section. We need
7714 to do this so that we can identify any sections which
7715 the linker has decided to not include. */
7716 sec
->linker_mark
= TRUE
;
7718 if (sec
->flags
& SEC_MERGE
)
7721 if (info
->relocatable
|| info
->emitrelocations
)
7722 reloc_count
= sec
->reloc_count
;
7723 else if (bed
->elf_backend_count_relocs
)
7725 Elf_Internal_Rela
* relocs
;
7727 relocs
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
7730 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
7732 if (elf_section_data (o
)->relocs
!= relocs
)
7736 if (sec
->rawsize
> max_contents_size
)
7737 max_contents_size
= sec
->rawsize
;
7738 if (sec
->size
> max_contents_size
)
7739 max_contents_size
= sec
->size
;
7741 /* We are interested in just local symbols, not all
7743 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
7744 && (sec
->owner
->flags
& DYNAMIC
) == 0)
7748 if (elf_bad_symtab (sec
->owner
))
7749 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
7750 / bed
->s
->sizeof_sym
);
7752 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
7754 if (sym_count
> max_sym_count
)
7755 max_sym_count
= sym_count
;
7757 if (sym_count
> max_sym_shndx_count
7758 && elf_symtab_shndx (sec
->owner
) != 0)
7759 max_sym_shndx_count
= sym_count
;
7761 if ((sec
->flags
& SEC_RELOC
) != 0)
7765 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
7766 if (ext_size
> max_external_reloc_size
)
7767 max_external_reloc_size
= ext_size
;
7768 if (sec
->reloc_count
> max_internal_reloc_count
)
7769 max_internal_reloc_count
= sec
->reloc_count
;
7774 if (reloc_count
== 0)
7777 o
->reloc_count
+= reloc_count
;
7779 /* MIPS may have a mix of REL and RELA relocs on sections.
7780 To support this curious ABI we keep reloc counts in
7781 elf_section_data too. We must be careful to add the
7782 relocations from the input section to the right output
7783 count. FIXME: Get rid of one count. We have
7784 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
7785 rel_count1
= &esdo
->rel_count
;
7788 bfd_boolean same_size
;
7789 bfd_size_type entsize1
;
7791 entsize1
= esdi
->rel_hdr
.sh_entsize
;
7792 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
7793 || entsize1
== bed
->s
->sizeof_rela
);
7794 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
7797 rel_count1
= &esdo
->rel_count2
;
7799 if (esdi
->rel_hdr2
!= NULL
)
7801 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
7802 unsigned int alt_count
;
7803 unsigned int *rel_count2
;
7805 BFD_ASSERT (entsize2
!= entsize1
7806 && (entsize2
== bed
->s
->sizeof_rel
7807 || entsize2
== bed
->s
->sizeof_rela
));
7809 rel_count2
= &esdo
->rel_count2
;
7811 rel_count2
= &esdo
->rel_count
;
7813 /* The following is probably too simplistic if the
7814 backend counts output relocs unusually. */
7815 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
7816 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
7817 *rel_count2
+= alt_count
;
7818 reloc_count
-= alt_count
;
7821 *rel_count1
+= reloc_count
;
7824 if (o
->reloc_count
> 0)
7825 o
->flags
|= SEC_RELOC
;
7828 /* Explicitly clear the SEC_RELOC flag. The linker tends to
7829 set it (this is probably a bug) and if it is set
7830 assign_section_numbers will create a reloc section. */
7831 o
->flags
&=~ SEC_RELOC
;
7834 /* If the SEC_ALLOC flag is not set, force the section VMA to
7835 zero. This is done in elf_fake_sections as well, but forcing
7836 the VMA to 0 here will ensure that relocs against these
7837 sections are handled correctly. */
7838 if ((o
->flags
& SEC_ALLOC
) == 0
7839 && ! o
->user_set_vma
)
7843 if (! info
->relocatable
&& merged
)
7844 elf_link_hash_traverse (elf_hash_table (info
),
7845 _bfd_elf_link_sec_merge_syms
, abfd
);
7847 /* Figure out the file positions for everything but the symbol table
7848 and the relocs. We set symcount to force assign_section_numbers
7849 to create a symbol table. */
7850 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
7851 BFD_ASSERT (! abfd
->output_has_begun
);
7852 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
7855 /* Set sizes, and assign file positions for reloc sections. */
7856 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
7858 if ((o
->flags
& SEC_RELOC
) != 0)
7860 if (!(_bfd_elf_link_size_reloc_section
7861 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
7864 if (elf_section_data (o
)->rel_hdr2
7865 && !(_bfd_elf_link_size_reloc_section
7866 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
7870 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
7871 to count upwards while actually outputting the relocations. */
7872 elf_section_data (o
)->rel_count
= 0;
7873 elf_section_data (o
)->rel_count2
= 0;
7876 _bfd_elf_assign_file_positions_for_relocs (abfd
);
7878 /* We have now assigned file positions for all the sections except
7879 .symtab and .strtab. We start the .symtab section at the current
7880 file position, and write directly to it. We build the .strtab
7881 section in memory. */
7882 bfd_get_symcount (abfd
) = 0;
7883 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
7884 /* sh_name is set in prep_headers. */
7885 symtab_hdr
->sh_type
= SHT_SYMTAB
;
7886 /* sh_flags, sh_addr and sh_size all start off zero. */
7887 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
7888 /* sh_link is set in assign_section_numbers. */
7889 /* sh_info is set below. */
7890 /* sh_offset is set just below. */
7891 symtab_hdr
->sh_addralign
= 1 << bed
->s
->log_file_align
;
7893 off
= elf_tdata (abfd
)->next_file_pos
;
7894 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
7896 /* Note that at this point elf_tdata (abfd)->next_file_pos is
7897 incorrect. We do not yet know the size of the .symtab section.
7898 We correct next_file_pos below, after we do know the size. */
7900 /* Allocate a buffer to hold swapped out symbols. This is to avoid
7901 continuously seeking to the right position in the file. */
7902 if (! info
->keep_memory
|| max_sym_count
< 20)
7903 finfo
.symbuf_size
= 20;
7905 finfo
.symbuf_size
= max_sym_count
;
7906 amt
= finfo
.symbuf_size
;
7907 amt
*= bed
->s
->sizeof_sym
;
7908 finfo
.symbuf
= bfd_malloc (amt
);
7909 if (finfo
.symbuf
== NULL
)
7911 if (elf_numsections (abfd
) > SHN_LORESERVE
)
7913 /* Wild guess at number of output symbols. realloc'd as needed. */
7914 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
7915 finfo
.shndxbuf_size
= amt
;
7916 amt
*= sizeof (Elf_External_Sym_Shndx
);
7917 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
7918 if (finfo
.symshndxbuf
== NULL
)
7922 /* Start writing out the symbol table. The first symbol is always a
7924 if (info
->strip
!= strip_all
7927 elfsym
.st_value
= 0;
7930 elfsym
.st_other
= 0;
7931 elfsym
.st_shndx
= SHN_UNDEF
;
7932 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
7937 /* Output a symbol for each section. We output these even if we are
7938 discarding local symbols, since they are used for relocs. These
7939 symbols have no names. We store the index of each one in the
7940 index field of the section, so that we can find it again when
7941 outputting relocs. */
7942 if (info
->strip
!= strip_all
7946 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
7947 elfsym
.st_other
= 0;
7948 for (i
= 1; i
< elf_numsections (abfd
); i
++)
7950 o
= bfd_section_from_elf_index (abfd
, i
);
7952 o
->target_index
= bfd_get_symcount (abfd
);
7953 elfsym
.st_shndx
= i
;
7954 if (info
->relocatable
|| o
== NULL
)
7955 elfsym
.st_value
= 0;
7957 elfsym
.st_value
= o
->vma
;
7958 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
7960 if (i
== SHN_LORESERVE
- 1)
7961 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
7965 /* Allocate some memory to hold information read in from the input
7967 if (max_contents_size
!= 0)
7969 finfo
.contents
= bfd_malloc (max_contents_size
);
7970 if (finfo
.contents
== NULL
)
7974 if (max_external_reloc_size
!= 0)
7976 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
7977 if (finfo
.external_relocs
== NULL
)
7981 if (max_internal_reloc_count
!= 0)
7983 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7984 amt
*= sizeof (Elf_Internal_Rela
);
7985 finfo
.internal_relocs
= bfd_malloc (amt
);
7986 if (finfo
.internal_relocs
== NULL
)
7990 if (max_sym_count
!= 0)
7992 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
7993 finfo
.external_syms
= bfd_malloc (amt
);
7994 if (finfo
.external_syms
== NULL
)
7997 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
7998 finfo
.internal_syms
= bfd_malloc (amt
);
7999 if (finfo
.internal_syms
== NULL
)
8002 amt
= max_sym_count
* sizeof (long);
8003 finfo
.indices
= bfd_malloc (amt
);
8004 if (finfo
.indices
== NULL
)
8007 amt
= max_sym_count
* sizeof (asection
*);
8008 finfo
.sections
= bfd_malloc (amt
);
8009 if (finfo
.sections
== NULL
)
8013 if (max_sym_shndx_count
!= 0)
8015 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
8016 finfo
.locsym_shndx
= bfd_malloc (amt
);
8017 if (finfo
.locsym_shndx
== NULL
)
8021 if (elf_hash_table (info
)->tls_sec
)
8023 bfd_vma base
, end
= 0;
8026 for (sec
= elf_hash_table (info
)->tls_sec
;
8027 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
8030 bfd_vma size
= sec
->size
;
8032 if (size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
8034 struct bfd_link_order
*o
;
8036 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
8037 if (size
< o
->offset
+ o
->size
)
8038 size
= o
->offset
+ o
->size
;
8040 end
= sec
->vma
+ size
;
8042 base
= elf_hash_table (info
)->tls_sec
->vma
;
8043 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
8044 elf_hash_table (info
)->tls_size
= end
- base
;
8047 /* Reorder SHF_LINK_ORDER sections. */
8048 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8050 if (!elf_fixup_link_order (abfd
, o
))
8054 /* Since ELF permits relocations to be against local symbols, we
8055 must have the local symbols available when we do the relocations.
8056 Since we would rather only read the local symbols once, and we
8057 would rather not keep them in memory, we handle all the
8058 relocations for a single input file at the same time.
8060 Unfortunately, there is no way to know the total number of local
8061 symbols until we have seen all of them, and the local symbol
8062 indices precede the global symbol indices. This means that when
8063 we are generating relocatable output, and we see a reloc against
8064 a global symbol, we can not know the symbol index until we have
8065 finished examining all the local symbols to see which ones we are
8066 going to output. To deal with this, we keep the relocations in
8067 memory, and don't output them until the end of the link. This is
8068 an unfortunate waste of memory, but I don't see a good way around
8069 it. Fortunately, it only happens when performing a relocatable
8070 link, which is not the common case. FIXME: If keep_memory is set
8071 we could write the relocs out and then read them again; I don't
8072 know how bad the memory loss will be. */
8074 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8075 sub
->output_has_begun
= FALSE
;
8076 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8078 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
8080 if (p
->type
== bfd_indirect_link_order
8081 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
8082 == bfd_target_elf_flavour
)
8083 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
8085 if (! sub
->output_has_begun
)
8087 if (! elf_link_input_bfd (&finfo
, sub
))
8089 sub
->output_has_begun
= TRUE
;
8092 else if (p
->type
== bfd_section_reloc_link_order
8093 || p
->type
== bfd_symbol_reloc_link_order
)
8095 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
8100 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
8106 /* Output any global symbols that got converted to local in a
8107 version script or due to symbol visibility. We do this in a
8108 separate step since ELF requires all local symbols to appear
8109 prior to any global symbols. FIXME: We should only do this if
8110 some global symbols were, in fact, converted to become local.
8111 FIXME: Will this work correctly with the Irix 5 linker? */
8112 eoinfo
.failed
= FALSE
;
8113 eoinfo
.finfo
= &finfo
;
8114 eoinfo
.localsyms
= TRUE
;
8115 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
8120 /* That wrote out all the local symbols. Finish up the symbol table
8121 with the global symbols. Even if we want to strip everything we
8122 can, we still need to deal with those global symbols that got
8123 converted to local in a version script. */
8125 /* The sh_info field records the index of the first non local symbol. */
8126 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
8129 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
8131 Elf_Internal_Sym sym
;
8132 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
8133 long last_local
= 0;
8135 /* Write out the section symbols for the output sections. */
8142 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
8145 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
8151 dynindx
= elf_section_data (s
)->dynindx
;
8154 indx
= elf_section_data (s
)->this_idx
;
8155 BFD_ASSERT (indx
> 0);
8156 sym
.st_shndx
= indx
;
8157 sym
.st_value
= s
->vma
;
8158 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
8159 if (last_local
< dynindx
)
8160 last_local
= dynindx
;
8161 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
8165 /* Write out the local dynsyms. */
8166 if (elf_hash_table (info
)->dynlocal
)
8168 struct elf_link_local_dynamic_entry
*e
;
8169 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
8174 sym
.st_size
= e
->isym
.st_size
;
8175 sym
.st_other
= e
->isym
.st_other
;
8177 /* Copy the internal symbol as is.
8178 Note that we saved a word of storage and overwrote
8179 the original st_name with the dynstr_index. */
8182 if (e
->isym
.st_shndx
!= SHN_UNDEF
8183 && (e
->isym
.st_shndx
< SHN_LORESERVE
8184 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
8186 s
= bfd_section_from_elf_index (e
->input_bfd
,
8190 elf_section_data (s
->output_section
)->this_idx
;
8191 sym
.st_value
= (s
->output_section
->vma
8193 + e
->isym
.st_value
);
8196 if (last_local
< e
->dynindx
)
8197 last_local
= e
->dynindx
;
8199 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
8200 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
8204 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
8208 /* We get the global symbols from the hash table. */
8209 eoinfo
.failed
= FALSE
;
8210 eoinfo
.localsyms
= FALSE
;
8211 eoinfo
.finfo
= &finfo
;
8212 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
8217 /* If backend needs to output some symbols not present in the hash
8218 table, do it now. */
8219 if (bed
->elf_backend_output_arch_syms
)
8221 typedef bfd_boolean (*out_sym_func
)
8222 (void *, const char *, Elf_Internal_Sym
*, asection
*,
8223 struct elf_link_hash_entry
*);
8225 if (! ((*bed
->elf_backend_output_arch_syms
)
8226 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
8230 /* Flush all symbols to the file. */
8231 if (! elf_link_flush_output_syms (&finfo
, bed
))
8234 /* Now we know the size of the symtab section. */
8235 off
+= symtab_hdr
->sh_size
;
8237 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
8238 if (symtab_shndx_hdr
->sh_name
!= 0)
8240 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
8241 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
8242 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
8243 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
8244 symtab_shndx_hdr
->sh_size
= amt
;
8246 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
8249 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
8250 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
8255 /* Finish up and write out the symbol string table (.strtab)
8257 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
8258 /* sh_name was set in prep_headers. */
8259 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
8260 symstrtab_hdr
->sh_flags
= 0;
8261 symstrtab_hdr
->sh_addr
= 0;
8262 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
8263 symstrtab_hdr
->sh_entsize
= 0;
8264 symstrtab_hdr
->sh_link
= 0;
8265 symstrtab_hdr
->sh_info
= 0;
8266 /* sh_offset is set just below. */
8267 symstrtab_hdr
->sh_addralign
= 1;
8269 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
8270 elf_tdata (abfd
)->next_file_pos
= off
;
8272 if (bfd_get_symcount (abfd
) > 0)
8274 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
8275 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
8279 /* Adjust the relocs to have the correct symbol indices. */
8280 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8282 if ((o
->flags
& SEC_RELOC
) == 0)
8285 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
8286 elf_section_data (o
)->rel_count
,
8287 elf_section_data (o
)->rel_hashes
);
8288 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
8289 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
8290 elf_section_data (o
)->rel_count2
,
8291 (elf_section_data (o
)->rel_hashes
8292 + elf_section_data (o
)->rel_count
));
8294 /* Set the reloc_count field to 0 to prevent write_relocs from
8295 trying to swap the relocs out itself. */
8299 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
8300 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
8302 /* If we are linking against a dynamic object, or generating a
8303 shared library, finish up the dynamic linking information. */
8306 bfd_byte
*dyncon
, *dynconend
;
8308 /* Fix up .dynamic entries. */
8309 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
8310 BFD_ASSERT (o
!= NULL
);
8312 dyncon
= o
->contents
;
8313 dynconend
= o
->contents
+ o
->size
;
8314 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
8316 Elf_Internal_Dyn dyn
;
8320 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
8327 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
8329 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
8331 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
8332 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
8335 dyn
.d_un
.d_val
= relativecount
;
8342 name
= info
->init_function
;
8345 name
= info
->fini_function
;
8348 struct elf_link_hash_entry
*h
;
8350 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
8351 FALSE
, FALSE
, TRUE
);
8353 && (h
->root
.type
== bfd_link_hash_defined
8354 || h
->root
.type
== bfd_link_hash_defweak
))
8356 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
8357 o
= h
->root
.u
.def
.section
;
8358 if (o
->output_section
!= NULL
)
8359 dyn
.d_un
.d_val
+= (o
->output_section
->vma
8360 + o
->output_offset
);
8363 /* The symbol is imported from another shared
8364 library and does not apply to this one. */
8372 case DT_PREINIT_ARRAYSZ
:
8373 name
= ".preinit_array";
8375 case DT_INIT_ARRAYSZ
:
8376 name
= ".init_array";
8378 case DT_FINI_ARRAYSZ
:
8379 name
= ".fini_array";
8381 o
= bfd_get_section_by_name (abfd
, name
);
8384 (*_bfd_error_handler
)
8385 (_("%B: could not find output section %s"), abfd
, name
);
8389 (*_bfd_error_handler
)
8390 (_("warning: %s section has zero size"), name
);
8391 dyn
.d_un
.d_val
= o
->size
;
8394 case DT_PREINIT_ARRAY
:
8395 name
= ".preinit_array";
8398 name
= ".init_array";
8401 name
= ".fini_array";
8414 name
= ".gnu.version_d";
8417 name
= ".gnu.version_r";
8420 name
= ".gnu.version";
8422 o
= bfd_get_section_by_name (abfd
, name
);
8425 (*_bfd_error_handler
)
8426 (_("%B: could not find output section %s"), abfd
, name
);
8429 dyn
.d_un
.d_ptr
= o
->vma
;
8436 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
8441 for (i
= 1; i
< elf_numsections (abfd
); i
++)
8443 Elf_Internal_Shdr
*hdr
;
8445 hdr
= elf_elfsections (abfd
)[i
];
8446 if (hdr
->sh_type
== type
8447 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
8449 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
8450 dyn
.d_un
.d_val
+= hdr
->sh_size
;
8453 if (dyn
.d_un
.d_val
== 0
8454 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
8455 dyn
.d_un
.d_val
= hdr
->sh_addr
;
8461 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
8465 /* If we have created any dynamic sections, then output them. */
8468 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
8471 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
8473 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
8475 || o
->output_section
== bfd_abs_section_ptr
)
8477 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
8479 /* At this point, we are only interested in sections
8480 created by _bfd_elf_link_create_dynamic_sections. */
8483 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
8485 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
8487 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
8489 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
8491 if (! bfd_set_section_contents (abfd
, o
->output_section
,
8493 (file_ptr
) o
->output_offset
,
8499 /* The contents of the .dynstr section are actually in a
8501 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
8502 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
8503 || ! _bfd_elf_strtab_emit (abfd
,
8504 elf_hash_table (info
)->dynstr
))
8510 if (info
->relocatable
)
8512 bfd_boolean failed
= FALSE
;
8514 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
8519 /* If we have optimized stabs strings, output them. */
8520 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
8522 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
8526 if (info
->eh_frame_hdr
)
8528 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
8532 if (finfo
.symstrtab
!= NULL
)
8533 _bfd_stringtab_free (finfo
.symstrtab
);
8534 if (finfo
.contents
!= NULL
)
8535 free (finfo
.contents
);
8536 if (finfo
.external_relocs
!= NULL
)
8537 free (finfo
.external_relocs
);
8538 if (finfo
.internal_relocs
!= NULL
)
8539 free (finfo
.internal_relocs
);
8540 if (finfo
.external_syms
!= NULL
)
8541 free (finfo
.external_syms
);
8542 if (finfo
.locsym_shndx
!= NULL
)
8543 free (finfo
.locsym_shndx
);
8544 if (finfo
.internal_syms
!= NULL
)
8545 free (finfo
.internal_syms
);
8546 if (finfo
.indices
!= NULL
)
8547 free (finfo
.indices
);
8548 if (finfo
.sections
!= NULL
)
8549 free (finfo
.sections
);
8550 if (finfo
.symbuf
!= NULL
)
8551 free (finfo
.symbuf
);
8552 if (finfo
.symshndxbuf
!= NULL
)
8553 free (finfo
.symshndxbuf
);
8554 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8556 if ((o
->flags
& SEC_RELOC
) != 0
8557 && elf_section_data (o
)->rel_hashes
!= NULL
)
8558 free (elf_section_data (o
)->rel_hashes
);
8561 elf_tdata (abfd
)->linker
= TRUE
;
8566 if (finfo
.symstrtab
!= NULL
)
8567 _bfd_stringtab_free (finfo
.symstrtab
);
8568 if (finfo
.contents
!= NULL
)
8569 free (finfo
.contents
);
8570 if (finfo
.external_relocs
!= NULL
)
8571 free (finfo
.external_relocs
);
8572 if (finfo
.internal_relocs
!= NULL
)
8573 free (finfo
.internal_relocs
);
8574 if (finfo
.external_syms
!= NULL
)
8575 free (finfo
.external_syms
);
8576 if (finfo
.locsym_shndx
!= NULL
)
8577 free (finfo
.locsym_shndx
);
8578 if (finfo
.internal_syms
!= NULL
)
8579 free (finfo
.internal_syms
);
8580 if (finfo
.indices
!= NULL
)
8581 free (finfo
.indices
);
8582 if (finfo
.sections
!= NULL
)
8583 free (finfo
.sections
);
8584 if (finfo
.symbuf
!= NULL
)
8585 free (finfo
.symbuf
);
8586 if (finfo
.symshndxbuf
!= NULL
)
8587 free (finfo
.symshndxbuf
);
8588 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
8590 if ((o
->flags
& SEC_RELOC
) != 0
8591 && elf_section_data (o
)->rel_hashes
!= NULL
)
8592 free (elf_section_data (o
)->rel_hashes
);
8598 /* Garbage collect unused sections. */
8600 /* The mark phase of garbage collection. For a given section, mark
8601 it and any sections in this section's group, and all the sections
8602 which define symbols to which it refers. */
8604 typedef asection
* (*gc_mark_hook_fn
)
8605 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8606 struct elf_link_hash_entry
*, Elf_Internal_Sym
*);
8609 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
8611 gc_mark_hook_fn gc_mark_hook
)
8614 asection
*group_sec
;
8618 /* Mark all the sections in the group. */
8619 group_sec
= elf_section_data (sec
)->next_in_group
;
8620 if (group_sec
&& !group_sec
->gc_mark
)
8621 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
8624 /* Look through the section relocs. */
8626 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
8628 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
8629 Elf_Internal_Shdr
*symtab_hdr
;
8630 struct elf_link_hash_entry
**sym_hashes
;
8633 bfd
*input_bfd
= sec
->owner
;
8634 const struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
8635 Elf_Internal_Sym
*isym
= NULL
;
8638 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8639 sym_hashes
= elf_sym_hashes (input_bfd
);
8641 /* Read the local symbols. */
8642 if (elf_bad_symtab (input_bfd
))
8644 nlocsyms
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8648 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
8650 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8651 if (isym
== NULL
&& nlocsyms
!= 0)
8653 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
8659 /* Read the relocations. */
8660 relstart
= _bfd_elf_link_read_relocs (input_bfd
, sec
, NULL
, NULL
,
8662 if (relstart
== NULL
)
8667 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8669 if (bed
->s
->arch_size
== 32)
8674 for (rel
= relstart
; rel
< relend
; rel
++)
8676 unsigned long r_symndx
;
8678 struct elf_link_hash_entry
*h
;
8680 r_symndx
= rel
->r_info
>> r_sym_shift
;
8684 if (r_symndx
>= nlocsyms
8685 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
8687 h
= sym_hashes
[r_symndx
- extsymoff
];
8688 while (h
->root
.type
== bfd_link_hash_indirect
8689 || h
->root
.type
== bfd_link_hash_warning
)
8690 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8691 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
8695 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
8698 if (rsec
&& !rsec
->gc_mark
)
8700 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
8702 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
8711 if (elf_section_data (sec
)->relocs
!= relstart
)
8714 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
8716 if (! info
->keep_memory
)
8719 symtab_hdr
->contents
= (unsigned char *) isym
;
8726 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
8729 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *idxptr
)
8733 if (h
->root
.type
== bfd_link_hash_warning
)
8734 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8736 if (h
->dynindx
!= -1
8737 && ((h
->root
.type
!= bfd_link_hash_defined
8738 && h
->root
.type
!= bfd_link_hash_defweak
)
8739 || h
->root
.u
.def
.section
->gc_mark
))
8740 h
->dynindx
= (*idx
)++;
8745 /* The sweep phase of garbage collection. Remove all garbage sections. */
8747 typedef bfd_boolean (*gc_sweep_hook_fn
)
8748 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
8751 elf_gc_sweep (struct bfd_link_info
*info
, gc_sweep_hook_fn gc_sweep_hook
)
8755 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8759 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8762 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8764 /* Keep debug and special sections. */
8765 if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
8766 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
)) == 0)
8772 /* Skip sweeping sections already excluded. */
8773 if (o
->flags
& SEC_EXCLUDE
)
8776 /* Since this is early in the link process, it is simple
8777 to remove a section from the output. */
8778 o
->flags
|= SEC_EXCLUDE
;
8780 /* But we also have to update some of the relocation
8781 info we collected before. */
8783 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
8785 Elf_Internal_Rela
*internal_relocs
;
8789 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
8791 if (internal_relocs
== NULL
)
8794 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
8796 if (elf_section_data (o
)->relocs
!= internal_relocs
)
8797 free (internal_relocs
);
8805 /* Remove the symbols that were in the swept sections from the dynamic
8806 symbol table. GCFIXME: Anyone know how to get them out of the
8807 static symbol table as well? */
8811 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
, &i
);
8813 elf_hash_table (info
)->dynsymcount
= i
;
8819 /* Propagate collected vtable information. This is called through
8820 elf_link_hash_traverse. */
8823 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
8825 if (h
->root
.type
== bfd_link_hash_warning
)
8826 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8828 /* Those that are not vtables. */
8829 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
8832 /* Those vtables that do not have parents, we cannot merge. */
8833 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
8836 /* If we've already been done, exit. */
8837 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
8840 /* Make sure the parent's table is up to date. */
8841 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
8843 if (h
->vtable
->used
== NULL
)
8845 /* None of this table's entries were referenced. Re-use the
8847 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
8848 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
8853 bfd_boolean
*cu
, *pu
;
8855 /* Or the parent's entries into ours. */
8856 cu
= h
->vtable
->used
;
8858 pu
= h
->vtable
->parent
->vtable
->used
;
8861 const struct elf_backend_data
*bed
;
8862 unsigned int log_file_align
;
8864 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
8865 log_file_align
= bed
->s
->log_file_align
;
8866 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
8881 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
8884 bfd_vma hstart
, hend
;
8885 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
8886 const struct elf_backend_data
*bed
;
8887 unsigned int log_file_align
;
8889 if (h
->root
.type
== bfd_link_hash_warning
)
8890 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8892 /* Take care of both those symbols that do not describe vtables as
8893 well as those that are not loaded. */
8894 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
8897 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
8898 || h
->root
.type
== bfd_link_hash_defweak
);
8900 sec
= h
->root
.u
.def
.section
;
8901 hstart
= h
->root
.u
.def
.value
;
8902 hend
= hstart
+ h
->size
;
8904 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
8906 return *(bfd_boolean
*) okp
= FALSE
;
8907 bed
= get_elf_backend_data (sec
->owner
);
8908 log_file_align
= bed
->s
->log_file_align
;
8910 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8912 for (rel
= relstart
; rel
< relend
; ++rel
)
8913 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
8915 /* If the entry is in use, do nothing. */
8917 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
8919 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
8920 if (h
->vtable
->used
[entry
])
8923 /* Otherwise, kill it. */
8924 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
8930 /* Mark sections containing dynamically referenced symbols. This is called
8931 through elf_link_hash_traverse. */
8934 elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
,
8935 void *okp ATTRIBUTE_UNUSED
)
8937 if (h
->root
.type
== bfd_link_hash_warning
)
8938 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8940 if ((h
->root
.type
== bfd_link_hash_defined
8941 || h
->root
.type
== bfd_link_hash_defweak
)
8943 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
8948 /* Do mark and sweep of unused sections. */
8951 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
8953 bfd_boolean ok
= TRUE
;
8955 asection
* (*gc_mark_hook
)
8956 (asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
8957 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*);
8959 if (!get_elf_backend_data (abfd
)->can_gc_sections
8960 || info
->relocatable
8961 || info
->emitrelocations
8963 || !is_elf_hash_table (info
->hash
))
8965 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
8969 /* Apply transitive closure to the vtable entry usage info. */
8970 elf_link_hash_traverse (elf_hash_table (info
),
8971 elf_gc_propagate_vtable_entries_used
,
8976 /* Kill the vtable relocations that were not used. */
8977 elf_link_hash_traverse (elf_hash_table (info
),
8978 elf_gc_smash_unused_vtentry_relocs
,
8983 /* Mark dynamically referenced symbols. */
8984 if (elf_hash_table (info
)->dynamic_sections_created
)
8985 elf_link_hash_traverse (elf_hash_table (info
),
8986 elf_gc_mark_dynamic_ref_symbol
,
8991 /* Grovel through relocs to find out who stays ... */
8992 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8993 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8997 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
9000 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
9002 if (o
->flags
& SEC_KEEP
)
9004 /* _bfd_elf_discard_section_eh_frame knows how to discard
9005 orphaned FDEs so don't mark sections referenced by the
9006 EH frame section. */
9007 if (strcmp (o
->name
, ".eh_frame") == 0)
9009 else if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
9015 /* ... and mark SEC_EXCLUDE for those that go. */
9016 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
9022 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
9025 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
9027 struct elf_link_hash_entry
*h
,
9030 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
9031 struct elf_link_hash_entry
**search
, *child
;
9032 bfd_size_type extsymcount
;
9033 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9035 /* The sh_info field of the symtab header tells us where the
9036 external symbols start. We don't care about the local symbols at
9038 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
9039 if (!elf_bad_symtab (abfd
))
9040 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
9042 sym_hashes
= elf_sym_hashes (abfd
);
9043 sym_hashes_end
= sym_hashes
+ extsymcount
;
9045 /* Hunt down the child symbol, which is in this section at the same
9046 offset as the relocation. */
9047 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
9049 if ((child
= *search
) != NULL
9050 && (child
->root
.type
== bfd_link_hash_defined
9051 || child
->root
.type
== bfd_link_hash_defweak
)
9052 && child
->root
.u
.def
.section
== sec
9053 && child
->root
.u
.def
.value
== offset
)
9057 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
9058 abfd
, sec
, (unsigned long) offset
);
9059 bfd_set_error (bfd_error_invalid_operation
);
9065 child
->vtable
= bfd_zalloc (abfd
, sizeof (*child
->vtable
));
9071 /* This *should* only be the absolute section. It could potentially
9072 be that someone has defined a non-global vtable though, which
9073 would be bad. It isn't worth paging in the local symbols to be
9074 sure though; that case should simply be handled by the assembler. */
9076 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
9079 child
->vtable
->parent
= h
;
9084 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
9087 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
9088 asection
*sec ATTRIBUTE_UNUSED
,
9089 struct elf_link_hash_entry
*h
,
9092 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9093 unsigned int log_file_align
= bed
->s
->log_file_align
;
9097 h
->vtable
= bfd_zalloc (abfd
, sizeof (*h
->vtable
));
9102 if (addend
>= h
->vtable
->size
)
9104 size_t size
, bytes
, file_align
;
9105 bfd_boolean
*ptr
= h
->vtable
->used
;
9107 /* While the symbol is undefined, we have to be prepared to handle
9109 file_align
= 1 << log_file_align
;
9110 if (h
->root
.type
== bfd_link_hash_undefined
)
9111 size
= addend
+ file_align
;
9117 /* Oops! We've got a reference past the defined end of
9118 the table. This is probably a bug -- shall we warn? */
9119 size
= addend
+ file_align
;
9122 size
= (size
+ file_align
- 1) & -file_align
;
9124 /* Allocate one extra entry for use as a "done" flag for the
9125 consolidation pass. */
9126 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
9130 ptr
= bfd_realloc (ptr
- 1, bytes
);
9136 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
9137 * sizeof (bfd_boolean
));
9138 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
9142 ptr
= bfd_zmalloc (bytes
);
9147 /* And arrange for that done flag to be at index -1. */
9148 h
->vtable
->used
= ptr
+ 1;
9149 h
->vtable
->size
= size
;
9152 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
9157 struct alloc_got_off_arg
{
9159 unsigned int got_elt_size
;
9162 /* We need a special top-level link routine to convert got reference counts
9163 to real got offsets. */
9166 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
9168 struct alloc_got_off_arg
*gofarg
= arg
;
9170 if (h
->root
.type
== bfd_link_hash_warning
)
9171 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9173 if (h
->got
.refcount
> 0)
9175 h
->got
.offset
= gofarg
->gotoff
;
9176 gofarg
->gotoff
+= gofarg
->got_elt_size
;
9179 h
->got
.offset
= (bfd_vma
) -1;
9184 /* And an accompanying bit to work out final got entry offsets once
9185 we're done. Should be called from final_link. */
9188 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
9189 struct bfd_link_info
*info
)
9192 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9194 unsigned int got_elt_size
= bed
->s
->arch_size
/ 8;
9195 struct alloc_got_off_arg gofarg
;
9197 if (! is_elf_hash_table (info
->hash
))
9200 /* The GOT offset is relative to the .got section, but the GOT header is
9201 put into the .got.plt section, if the backend uses it. */
9202 if (bed
->want_got_plt
)
9205 gotoff
= bed
->got_header_size
;
9207 /* Do the local .got entries first. */
9208 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
9210 bfd_signed_vma
*local_got
;
9211 bfd_size_type j
, locsymcount
;
9212 Elf_Internal_Shdr
*symtab_hdr
;
9214 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
9217 local_got
= elf_local_got_refcounts (i
);
9221 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
9222 if (elf_bad_symtab (i
))
9223 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9225 locsymcount
= symtab_hdr
->sh_info
;
9227 for (j
= 0; j
< locsymcount
; ++j
)
9229 if (local_got
[j
] > 0)
9231 local_got
[j
] = gotoff
;
9232 gotoff
+= got_elt_size
;
9235 local_got
[j
] = (bfd_vma
) -1;
9239 /* Then the global .got entries. .plt refcounts are handled by
9240 adjust_dynamic_symbol */
9241 gofarg
.gotoff
= gotoff
;
9242 gofarg
.got_elt_size
= got_elt_size
;
9243 elf_link_hash_traverse (elf_hash_table (info
),
9244 elf_gc_allocate_got_offsets
,
9249 /* Many folk need no more in the way of final link than this, once
9250 got entry reference counting is enabled. */
9253 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
9255 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
9258 /* Invoke the regular ELF backend linker to do all the work. */
9259 return bfd_elf_final_link (abfd
, info
);
9263 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
9265 struct elf_reloc_cookie
*rcookie
= cookie
;
9267 if (rcookie
->bad_symtab
)
9268 rcookie
->rel
= rcookie
->rels
;
9270 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
9272 unsigned long r_symndx
;
9274 if (! rcookie
->bad_symtab
)
9275 if (rcookie
->rel
->r_offset
> offset
)
9277 if (rcookie
->rel
->r_offset
!= offset
)
9280 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
9281 if (r_symndx
== SHN_UNDEF
)
9284 if (r_symndx
>= rcookie
->locsymcount
9285 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
9287 struct elf_link_hash_entry
*h
;
9289 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
9291 while (h
->root
.type
== bfd_link_hash_indirect
9292 || h
->root
.type
== bfd_link_hash_warning
)
9293 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9295 if ((h
->root
.type
== bfd_link_hash_defined
9296 || h
->root
.type
== bfd_link_hash_defweak
)
9297 && elf_discarded_section (h
->root
.u
.def
.section
))
9304 /* It's not a relocation against a global symbol,
9305 but it could be a relocation against a local
9306 symbol for a discarded section. */
9308 Elf_Internal_Sym
*isym
;
9310 /* Need to: get the symbol; get the section. */
9311 isym
= &rcookie
->locsyms
[r_symndx
];
9312 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
9314 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
9315 if (isec
!= NULL
&& elf_discarded_section (isec
))
9324 /* Discard unneeded references to discarded sections.
9325 Returns TRUE if any section's size was changed. */
9326 /* This function assumes that the relocations are in sorted order,
9327 which is true for all known assemblers. */
9330 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
9332 struct elf_reloc_cookie cookie
;
9333 asection
*stab
, *eh
;
9334 Elf_Internal_Shdr
*symtab_hdr
;
9335 const struct elf_backend_data
*bed
;
9338 bfd_boolean ret
= FALSE
;
9340 if (info
->traditional_format
9341 || !is_elf_hash_table (info
->hash
))
9344 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
9346 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
9349 bed
= get_elf_backend_data (abfd
);
9351 if ((abfd
->flags
& DYNAMIC
) != 0)
9354 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
9355 if (info
->relocatable
9358 || bfd_is_abs_section (eh
->output_section
))))
9361 stab
= bfd_get_section_by_name (abfd
, ".stab");
9364 || bfd_is_abs_section (stab
->output_section
)
9365 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
9370 && bed
->elf_backend_discard_info
== NULL
)
9373 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9375 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
9376 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
9377 if (cookie
.bad_symtab
)
9379 cookie
.locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9380 cookie
.extsymoff
= 0;
9384 cookie
.locsymcount
= symtab_hdr
->sh_info
;
9385 cookie
.extsymoff
= symtab_hdr
->sh_info
;
9388 if (bed
->s
->arch_size
== 32)
9389 cookie
.r_sym_shift
= 8;
9391 cookie
.r_sym_shift
= 32;
9393 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9394 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
9396 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
9397 cookie
.locsymcount
, 0,
9399 if (cookie
.locsyms
== NULL
)
9406 count
= stab
->reloc_count
;
9408 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, stab
, NULL
, NULL
,
9410 if (cookie
.rels
!= NULL
)
9412 cookie
.rel
= cookie
.rels
;
9413 cookie
.relend
= cookie
.rels
;
9414 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
9415 if (_bfd_discard_section_stabs (abfd
, stab
,
9416 elf_section_data (stab
)->sec_info
,
9417 bfd_elf_reloc_symbol_deleted_p
,
9420 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
9428 count
= eh
->reloc_count
;
9430 cookie
.rels
= _bfd_elf_link_read_relocs (abfd
, eh
, NULL
, NULL
,
9432 cookie
.rel
= cookie
.rels
;
9433 cookie
.relend
= cookie
.rels
;
9434 if (cookie
.rels
!= NULL
)
9435 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
9437 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
9438 bfd_elf_reloc_symbol_deleted_p
,
9442 if (cookie
.rels
!= NULL
9443 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
9447 if (bed
->elf_backend_discard_info
!= NULL
9448 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
9451 if (cookie
.locsyms
!= NULL
9452 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
9454 if (! info
->keep_memory
)
9455 free (cookie
.locsyms
);
9457 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
9461 if (info
->eh_frame_hdr
9462 && !info
->relocatable
9463 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
9470 _bfd_elf_section_already_linked (bfd
*abfd
, struct bfd_section
* sec
)
9473 const char *name
, *p
;
9474 struct bfd_section_already_linked
*l
;
9475 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
9478 /* A single member comdat group section may be discarded by a
9479 linkonce section. See below. */
9480 if (sec
->output_section
== bfd_abs_section_ptr
)
9485 /* Check if it belongs to a section group. */
9486 group
= elf_sec_group (sec
);
9488 /* Return if it isn't a linkonce section nor a member of a group. A
9489 comdat group section also has SEC_LINK_ONCE set. */
9490 if ((flags
& SEC_LINK_ONCE
) == 0 && group
== NULL
)
9495 /* If this is the member of a single member comdat group, check if
9496 the group should be discarded. */
9497 if (elf_next_in_group (sec
) == sec
9498 && (group
->flags
& SEC_LINK_ONCE
) != 0)
9504 /* FIXME: When doing a relocatable link, we may have trouble
9505 copying relocations in other sections that refer to local symbols
9506 in the section being discarded. Those relocations will have to
9507 be converted somehow; as of this writing I'm not sure that any of
9508 the backends handle that correctly.
9510 It is tempting to instead not discard link once sections when
9511 doing a relocatable link (technically, they should be discarded
9512 whenever we are building constructors). However, that fails,
9513 because the linker winds up combining all the link once sections
9514 into a single large link once section, which defeats the purpose
9515 of having link once sections in the first place.
9517 Also, not merging link once sections in a relocatable link
9518 causes trouble for MIPS ELF, which relies on link once semantics
9519 to handle the .reginfo section correctly. */
9521 name
= bfd_get_section_name (abfd
, sec
);
9523 if (strncmp (name
, ".gnu.linkonce.", sizeof (".gnu.linkonce.") - 1) == 0
9524 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
9529 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
9531 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
9533 /* We may have 3 different sections on the list: group section,
9534 comdat section and linkonce section. SEC may be a linkonce or
9535 group section. We match a group section with a group section,
9536 a linkonce section with a linkonce section, and ignore comdat
9538 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
9539 && strcmp (name
, l
->sec
->name
) == 0
9540 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
9542 /* The section has already been linked. See if we should
9544 switch (flags
& SEC_LINK_DUPLICATES
)
9549 case SEC_LINK_DUPLICATES_DISCARD
:
9552 case SEC_LINK_DUPLICATES_ONE_ONLY
:
9553 (*_bfd_error_handler
)
9554 (_("%B: ignoring duplicate section `%A'\n"),
9558 case SEC_LINK_DUPLICATES_SAME_SIZE
:
9559 if (sec
->size
!= l
->sec
->size
)
9560 (*_bfd_error_handler
)
9561 (_("%B: duplicate section `%A' has different size\n"),
9565 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
9566 if (sec
->size
!= l
->sec
->size
)
9567 (*_bfd_error_handler
)
9568 (_("%B: duplicate section `%A' has different size\n"),
9570 else if (sec
->size
!= 0)
9572 bfd_byte
*sec_contents
, *l_sec_contents
;
9574 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
9575 (*_bfd_error_handler
)
9576 (_("%B: warning: could not read contents of section `%A'\n"),
9578 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
9580 (*_bfd_error_handler
)
9581 (_("%B: warning: could not read contents of section `%A'\n"),
9582 l
->sec
->owner
, l
->sec
);
9583 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
9584 (*_bfd_error_handler
)
9585 (_("%B: warning: duplicate section `%A' has different contents\n"),
9589 free (sec_contents
);
9591 free (l_sec_contents
);
9596 /* Set the output_section field so that lang_add_section
9597 does not create a lang_input_section structure for this
9598 section. Since there might be a symbol in the section
9599 being discarded, we must retain a pointer to the section
9600 which we are really going to use. */
9601 sec
->output_section
= bfd_abs_section_ptr
;
9602 sec
->kept_section
= l
->sec
;
9604 if (flags
& SEC_GROUP
)
9606 asection
*first
= elf_next_in_group (sec
);
9607 asection
*s
= first
;
9611 s
->output_section
= bfd_abs_section_ptr
;
9612 /* Record which group discards it. */
9613 s
->kept_section
= l
->sec
;
9614 s
= elf_next_in_group (s
);
9615 /* These lists are circular. */
9627 /* If this is the member of a single member comdat group and the
9628 group hasn't be discarded, we check if it matches a linkonce
9629 section. We only record the discarded comdat group. Otherwise
9630 the undiscarded group will be discarded incorrectly later since
9631 itself has been recorded. */
9632 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
9633 if ((l
->sec
->flags
& SEC_GROUP
) == 0
9634 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
9635 && bfd_elf_match_symbols_in_sections (l
->sec
,
9636 elf_next_in_group (sec
)))
9638 elf_next_in_group (sec
)->output_section
= bfd_abs_section_ptr
;
9639 elf_next_in_group (sec
)->kept_section
= l
->sec
;
9640 group
->output_section
= bfd_abs_section_ptr
;
9647 /* There is no direct match. But for linkonce section, we should
9648 check if there is a match with comdat group member. We always
9649 record the linkonce section, discarded or not. */
9650 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
9651 if (l
->sec
->flags
& SEC_GROUP
)
9653 asection
*first
= elf_next_in_group (l
->sec
);
9656 && elf_next_in_group (first
) == first
9657 && bfd_elf_match_symbols_in_sections (first
, sec
))
9659 sec
->output_section
= bfd_abs_section_ptr
;
9660 sec
->kept_section
= l
->sec
;
9665 /* This is the first section with this name. Record it. */
9666 bfd_section_already_linked_table_insert (already_linked_list
, sec
);