2 Copyright 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_collect_hash_codes
54 PARAMS ((struct elf_link_hash_entry
*, PTR
));
56 /* Given an ELF BFD, add symbols to the global hash table as
60 elf_bfd_link_add_symbols (abfd
, info
)
62 struct bfd_link_info
*info
;
64 switch (bfd_get_format (abfd
))
67 return elf_link_add_object_symbols (abfd
, info
);
69 return elf_link_add_archive_symbols (abfd
, info
);
71 bfd_set_error (bfd_error_wrong_format
);
77 /* Add symbols from an ELF archive file to the linker hash table. We
78 don't use _bfd_generic_link_add_archive_symbols because of a
79 problem which arises on UnixWare. The UnixWare libc.so is an
80 archive which includes an entry libc.so.1 which defines a bunch of
81 symbols. The libc.so archive also includes a number of other
82 object files, which also define symbols, some of which are the same
83 as those defined in libc.so.1. Correct linking requires that we
84 consider each object file in turn, and include it if it defines any
85 symbols we need. _bfd_generic_link_add_archive_symbols does not do
86 this; it looks through the list of undefined symbols, and includes
87 any object file which defines them. When this algorithm is used on
88 UnixWare, it winds up pulling in libc.so.1 early and defining a
89 bunch of symbols. This means that some of the other objects in the
90 archive are not included in the link, which is incorrect since they
91 precede libc.so.1 in the archive.
93 Fortunately, ELF archive handling is simpler than that done by
94 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
95 oddities. In ELF, if we find a symbol in the archive map, and the
96 symbol is currently undefined, we know that we must pull in that
99 Unfortunately, we do have to make multiple passes over the symbol
100 table until nothing further is resolved. */
103 elf_link_add_archive_symbols (abfd
, info
)
105 struct bfd_link_info
*info
;
108 boolean
*defined
= NULL
;
109 boolean
*included
= NULL
;
113 if (! bfd_has_map (abfd
))
115 /* An empty archive is a special case. */
116 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
118 bfd_set_error (bfd_error_no_armap
);
122 /* Keep track of all symbols we know to be already defined, and all
123 files we know to be already included. This is to speed up the
124 second and subsequent passes. */
125 c
= bfd_ardata (abfd
)->symdef_count
;
128 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
129 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
130 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
132 memset (defined
, 0, c
* sizeof (boolean
));
133 memset (included
, 0, c
* sizeof (boolean
));
135 symdefs
= bfd_ardata (abfd
)->symdefs
;
148 symdefend
= symdef
+ c
;
149 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
151 struct elf_link_hash_entry
*h
;
153 struct bfd_link_hash_entry
*undefs_tail
;
156 if (defined
[i
] || included
[i
])
158 if (symdef
->file_offset
== last
)
164 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
165 false, false, false);
171 /* If this is a default version (the name contains @@),
172 look up the symbol again without the version. The
173 effect is that references to the symbol without the
174 version will be matched by the default symbol in the
177 p
= strchr (symdef
->name
, ELF_VER_CHR
);
178 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
181 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
184 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
185 copy
[p
- symdef
->name
] = '\0';
187 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
188 false, false, false);
190 bfd_release (abfd
, copy
);
196 if (h
->root
.type
!= bfd_link_hash_undefined
)
198 if (h
->root
.type
!= bfd_link_hash_undefweak
)
203 /* We need to include this archive member. */
205 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
206 if (element
== (bfd
*) NULL
)
209 if (! bfd_check_format (element
, bfd_object
))
212 /* Doublecheck that we have not included this object
213 already--it should be impossible, but there may be
214 something wrong with the archive. */
215 if (element
->archive_pass
!= 0)
217 bfd_set_error (bfd_error_bad_value
);
220 element
->archive_pass
= 1;
222 undefs_tail
= info
->hash
->undefs_tail
;
224 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
227 if (! elf_link_add_object_symbols (element
, info
))
230 /* If there are any new undefined symbols, we need to make
231 another pass through the archive in order to see whether
232 they can be defined. FIXME: This isn't perfect, because
233 common symbols wind up on undefs_tail and because an
234 undefined symbol which is defined later on in this pass
235 does not require another pass. This isn't a bug, but it
236 does make the code less efficient than it could be. */
237 if (undefs_tail
!= info
->hash
->undefs_tail
)
240 /* Look backward to mark all symbols from this object file
241 which we have already seen in this pass. */
245 included
[mark
] = true;
250 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
252 /* We mark subsequent symbols from this object file as we go
253 on through the loop. */
254 last
= symdef
->file_offset
;
265 if (defined
!= (boolean
*) NULL
)
267 if (included
!= (boolean
*) NULL
)
272 /* This function is called when we want to define a new symbol. It
273 handles the various cases which arise when we find a definition in
274 a dynamic object, or when there is already a definition in a
275 dynamic object. The new symbol is described by NAME, SYM, PSEC,
276 and PVALUE. We set SYM_HASH to the hash table entry. We set
277 OVERRIDE if the old symbol is overriding a new definition. We set
278 TYPE_CHANGE_OK if it is OK for the type to change. We set
279 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
280 change, we mean that we shouldn't warn if the type or size does
284 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
285 override
, type_change_ok
, size_change_ok
)
287 struct bfd_link_info
*info
;
289 Elf_Internal_Sym
*sym
;
292 struct elf_link_hash_entry
**sym_hash
;
294 boolean
*type_change_ok
;
295 boolean
*size_change_ok
;
298 struct elf_link_hash_entry
*h
;
301 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
306 bind
= ELF_ST_BIND (sym
->st_info
);
308 if (! bfd_is_und_section (sec
))
309 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
311 h
= ((struct elf_link_hash_entry
*)
312 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
317 /* This code is for coping with dynamic objects, and is only useful
318 if we are doing an ELF link. */
319 if (info
->hash
->creator
!= abfd
->xvec
)
322 /* For merging, we only care about real symbols. */
324 while (h
->root
.type
== bfd_link_hash_indirect
325 || h
->root
.type
== bfd_link_hash_warning
)
326 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
328 /* If we just created the symbol, mark it as being an ELF symbol.
329 Other than that, there is nothing to do--there is no merge issue
330 with a newly defined symbol--so we just return. */
332 if (h
->root
.type
== bfd_link_hash_new
)
334 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
338 /* OLDBFD is a BFD associated with the existing symbol. */
340 switch (h
->root
.type
)
346 case bfd_link_hash_undefined
:
347 case bfd_link_hash_undefweak
:
348 oldbfd
= h
->root
.u
.undef
.abfd
;
351 case bfd_link_hash_defined
:
352 case bfd_link_hash_defweak
:
353 oldbfd
= h
->root
.u
.def
.section
->owner
;
356 case bfd_link_hash_common
:
357 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
361 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
362 respectively, is from a dynamic object. */
364 if ((abfd
->flags
& DYNAMIC
) != 0)
369 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
374 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
375 respectively, appear to be a definition rather than reference. */
377 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
382 if (h
->root
.type
== bfd_link_hash_undefined
383 || h
->root
.type
== bfd_link_hash_undefweak
384 || h
->root
.type
== bfd_link_hash_common
)
389 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
390 symbol, respectively, appears to be a common symbol in a dynamic
391 object. If a symbol appears in an uninitialized section, and is
392 not weak, and is not a function, then it may be a common symbol
393 which was resolved when the dynamic object was created. We want
394 to treat such symbols specially, because they raise special
395 considerations when setting the symbol size: if the symbol
396 appears as a common symbol in a regular object, and the size in
397 the regular object is larger, we must make sure that we use the
398 larger size. This problematic case can always be avoided in C,
399 but it must be handled correctly when using Fortran shared
402 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
403 likewise for OLDDYNCOMMON and OLDDEF.
405 Note that this test is just a heuristic, and that it is quite
406 possible to have an uninitialized symbol in a shared object which
407 is really a definition, rather than a common symbol. This could
408 lead to some minor confusion when the symbol really is a common
409 symbol in some regular object. However, I think it will be
414 && (sec
->flags
& SEC_ALLOC
) != 0
415 && (sec
->flags
& SEC_LOAD
) == 0
418 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
421 newdyncommon
= false;
425 && h
->root
.type
== bfd_link_hash_defined
426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
427 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
428 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
430 && h
->type
!= STT_FUNC
)
433 olddyncommon
= false;
435 /* It's OK to change the type if either the existing symbol or the
436 new symbol is weak. */
438 if (h
->root
.type
== bfd_link_hash_defweak
439 || h
->root
.type
== bfd_link_hash_undefweak
441 *type_change_ok
= true;
443 /* It's OK to change the size if either the existing symbol or the
444 new symbol is weak, or if the old symbol is undefined. */
447 || h
->root
.type
== bfd_link_hash_undefined
)
448 *size_change_ok
= true;
450 /* If both the old and the new symbols look like common symbols in a
451 dynamic object, set the size of the symbol to the larger of the
456 && sym
->st_size
!= h
->size
)
458 /* Since we think we have two common symbols, issue a multiple
459 common warning if desired. Note that we only warn if the
460 size is different. If the size is the same, we simply let
461 the old symbol override the new one as normally happens with
462 symbols defined in dynamic objects. */
464 if (! ((*info
->callbacks
->multiple_common
)
465 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
466 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
469 if (sym
->st_size
> h
->size
)
470 h
->size
= sym
->st_size
;
472 *size_change_ok
= true;
475 /* If we are looking at a dynamic object, and we have found a
476 definition, we need to see if the symbol was already defined by
477 some other object. If so, we want to use the existing
478 definition, and we do not want to report a multiple symbol
479 definition error; we do this by clobbering *PSEC to be
482 We treat a common symbol as a definition if the symbol in the
483 shared library is a function, since common symbols always
484 represent variables; this can cause confusion in principle, but
485 any such confusion would seem to indicate an erroneous program or
486 shared library. We also permit a common symbol in a regular
487 object to override a weak symbol in a shared object. */
492 || (h
->root
.type
== bfd_link_hash_common
494 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
498 newdyncommon
= false;
500 *psec
= sec
= bfd_und_section_ptr
;
501 *size_change_ok
= true;
503 /* If we get here when the old symbol is a common symbol, then
504 we are explicitly letting it override a weak symbol or
505 function in a dynamic object, and we don't want to warn about
506 a type change. If the old symbol is a defined symbol, a type
507 change warning may still be appropriate. */
509 if (h
->root
.type
== bfd_link_hash_common
)
510 *type_change_ok
= true;
513 /* Handle the special case of an old common symbol merging with a
514 new symbol which looks like a common symbol in a shared object.
515 We change *PSEC and *PVALUE to make the new symbol look like a
516 common symbol, and let _bfd_generic_link_add_one_symbol will do
520 && h
->root
.type
== bfd_link_hash_common
)
524 newdyncommon
= false;
525 *pvalue
= sym
->st_size
;
526 *psec
= sec
= bfd_com_section_ptr
;
527 *size_change_ok
= true;
530 /* If the old symbol is from a dynamic object, and the new symbol is
531 a definition which is not from a dynamic object, then the new
532 symbol overrides the old symbol. Symbols from regular files
533 always take precedence over symbols from dynamic objects, even if
534 they are defined after the dynamic object in the link.
536 As above, we again permit a common symbol in a regular object to
537 override a definition in a shared object if the shared object
538 symbol is a function or is weak. */
542 || (bfd_is_com_section (sec
)
543 && (h
->root
.type
== bfd_link_hash_defweak
544 || h
->type
== STT_FUNC
)))
547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
549 /* Change the hash table entry to undefined, and let
550 _bfd_generic_link_add_one_symbol do the right thing with the
553 h
->root
.type
= bfd_link_hash_undefined
;
554 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
555 *size_change_ok
= true;
558 olddyncommon
= false;
560 /* We again permit a type change when a common symbol may be
561 overriding a function. */
563 if (bfd_is_com_section (sec
))
564 *type_change_ok
= true;
566 /* This union may have been set to be non-NULL when this symbol
567 was seen in a dynamic object. We must force the union to be
568 NULL, so that it is correct for a regular symbol. */
570 h
->verinfo
.vertree
= NULL
;
572 /* In this special case, if H is the target of an indirection,
573 we want the caller to frob with H rather than with the
574 indirect symbol. That will permit the caller to redefine the
575 target of the indirection, rather than the indirect symbol
576 itself. FIXME: This will break the -y option if we store a
577 symbol with a different name. */
581 /* Handle the special case of a new common symbol merging with an
582 old symbol that looks like it might be a common symbol defined in
583 a shared object. Note that we have already handled the case in
584 which a new common symbol should simply override the definition
585 in the shared library. */
588 && bfd_is_com_section (sec
)
591 /* It would be best if we could set the hash table entry to a
592 common symbol, but we don't know what to use for the section
594 if (! ((*info
->callbacks
->multiple_common
)
595 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
596 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
599 /* If the predumed common symbol in the dynamic object is
600 larger, pretend that the new symbol has its size. */
602 if (h
->size
> *pvalue
)
605 /* FIXME: We no longer know the alignment required by the symbol
606 in the dynamic object, so we just wind up using the one from
607 the regular object. */
610 olddyncommon
= false;
612 h
->root
.type
= bfd_link_hash_undefined
;
613 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
615 *size_change_ok
= true;
616 *type_change_ok
= true;
618 h
->verinfo
.vertree
= NULL
;
624 /* Add symbols from an ELF object file to the linker hash table. */
627 elf_link_add_object_symbols (abfd
, info
)
629 struct bfd_link_info
*info
;
631 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
632 const Elf_Internal_Sym
*,
633 const char **, flagword
*,
634 asection
**, bfd_vma
*));
635 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 asection
*, const Elf_Internal_Rela
*));
638 Elf_Internal_Shdr
*hdr
;
642 Elf_External_Sym
*buf
= NULL
;
643 struct elf_link_hash_entry
**sym_hash
;
645 bfd_byte
*dynver
= NULL
;
646 Elf_External_Versym
*extversym
= NULL
;
647 Elf_External_Versym
*ever
;
648 Elf_External_Dyn
*dynbuf
= NULL
;
649 struct elf_link_hash_entry
*weaks
;
650 Elf_External_Sym
*esym
;
651 Elf_External_Sym
*esymend
;
653 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
654 collect
= get_elf_backend_data (abfd
)->collect
;
656 if ((abfd
->flags
& DYNAMIC
) == 0)
662 /* You can't use -r against a dynamic object. Also, there's no
663 hope of using a dynamic object which does not exactly match
664 the format of the output file. */
665 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
667 bfd_set_error (bfd_error_invalid_operation
);
672 /* As a GNU extension, any input sections which are named
673 .gnu.warning.SYMBOL are treated as warning symbols for the given
674 symbol. This differs from .gnu.warning sections, which generate
675 warnings when they are included in an output file. */
680 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
684 name
= bfd_get_section_name (abfd
, s
);
685 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
690 name
+= sizeof ".gnu.warning." - 1;
692 /* If this is a shared object, then look up the symbol
693 in the hash table. If it is there, and it is already
694 been defined, then we will not be using the entry
695 from this shared object, so we don't need to warn.
696 FIXME: If we see the definition in a regular object
697 later on, we will warn, but we shouldn't. The only
698 fix is to keep track of what warnings we are supposed
699 to emit, and then handle them all at the end of the
701 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
703 struct elf_link_hash_entry
*h
;
705 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
708 /* FIXME: What about bfd_link_hash_common? */
710 && (h
->root
.type
== bfd_link_hash_defined
711 || h
->root
.type
== bfd_link_hash_defweak
))
713 /* We don't want to issue this warning. Clobber
714 the section size so that the warning does not
715 get copied into the output file. */
721 sz
= bfd_section_size (abfd
, s
);
722 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
726 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
731 if (! (_bfd_generic_link_add_one_symbol
732 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
733 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
736 if (! info
->relocateable
)
738 /* Clobber the section size so that the warning does
739 not get copied into the output file. */
746 /* If this is a dynamic object, we always link against the .dynsym
747 symbol table, not the .symtab symbol table. The dynamic linker
748 will only see the .dynsym symbol table, so there is no reason to
749 look at .symtab for a dynamic object. */
751 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
752 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
754 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
758 /* Read in any version definitions. */
760 if (! _bfd_elf_slurp_version_tables (abfd
))
763 /* Read in the symbol versions, but don't bother to convert them
764 to internal format. */
765 if (elf_dynversym (abfd
) != 0)
767 Elf_Internal_Shdr
*versymhdr
;
769 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
770 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
771 if (extversym
== NULL
)
773 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
774 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
775 != versymhdr
->sh_size
))
780 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
782 /* The sh_info field of the symtab header tells us where the
783 external symbols start. We don't care about the local symbols at
785 if (elf_bad_symtab (abfd
))
787 extsymcount
= symcount
;
792 extsymcount
= symcount
- hdr
->sh_info
;
793 extsymoff
= hdr
->sh_info
;
796 buf
= ((Elf_External_Sym
*)
797 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
798 if (buf
== NULL
&& extsymcount
!= 0)
801 /* We store a pointer to the hash table entry for each external
803 sym_hash
= ((struct elf_link_hash_entry
**)
805 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
806 if (sym_hash
== NULL
)
808 elf_sym_hashes (abfd
) = sym_hash
;
812 /* If we are creating a shared library, create all the dynamic
813 sections immediately. We need to attach them to something,
814 so we attach them to this BFD, provided it is the right
815 format. FIXME: If there are no input BFD's of the same
816 format as the output, we can't make a shared library. */
818 && ! elf_hash_table (info
)->dynamic_sections_created
819 && abfd
->xvec
== info
->hash
->creator
)
821 if (! elf_link_create_dynamic_sections (abfd
, info
))
830 bfd_size_type oldsize
;
831 bfd_size_type strindex
;
833 /* Find the name to use in a DT_NEEDED entry that refers to this
834 object. If the object has a DT_SONAME entry, we use it.
835 Otherwise, if the generic linker stuck something in
836 elf_dt_name, we use that. Otherwise, we just use the file
837 name. If the generic linker put a null string into
838 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
839 there is a DT_SONAME entry. */
841 name
= bfd_get_filename (abfd
);
842 if (elf_dt_name (abfd
) != NULL
)
844 name
= elf_dt_name (abfd
);
848 s
= bfd_get_section_by_name (abfd
, ".dynamic");
851 Elf_External_Dyn
*extdyn
;
852 Elf_External_Dyn
*extdynend
;
856 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
860 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
861 (file_ptr
) 0, s
->_raw_size
))
864 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
867 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
870 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
871 for (; extdyn
< extdynend
; extdyn
++)
873 Elf_Internal_Dyn dyn
;
875 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
876 if (dyn
.d_tag
== DT_SONAME
)
878 name
= bfd_elf_string_from_elf_section (abfd
, link
,
883 if (dyn
.d_tag
== DT_NEEDED
)
885 struct bfd_link_needed_list
*n
, **pn
;
888 n
= ((struct bfd_link_needed_list
*)
889 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
890 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
892 if (n
== NULL
|| fnm
== NULL
)
894 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
901 for (pn
= &elf_hash_table (info
)->needed
;
913 /* We do not want to include any of the sections in a dynamic
914 object in the output file. We hack by simply clobbering the
915 list of sections in the BFD. This could be handled more
916 cleanly by, say, a new section flag; the existing
917 SEC_NEVER_LOAD flag is not the one we want, because that one
918 still implies that the section takes up space in the output
920 abfd
->sections
= NULL
;
921 abfd
->section_count
= 0;
923 /* If this is the first dynamic object found in the link, create
924 the special sections required for dynamic linking. */
925 if (! elf_hash_table (info
)->dynamic_sections_created
)
927 if (! elf_link_create_dynamic_sections (abfd
, info
))
933 /* Add a DT_NEEDED entry for this dynamic object. */
934 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
935 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
937 if (strindex
== (bfd_size_type
) -1)
940 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
943 Elf_External_Dyn
*dyncon
, *dynconend
;
945 /* The hash table size did not change, which means that
946 the dynamic object name was already entered. If we
947 have already included this dynamic object in the
948 link, just ignore it. There is no reason to include
949 a particular dynamic object more than once. */
950 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
952 BFD_ASSERT (sdyn
!= NULL
);
954 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
955 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
957 for (; dyncon
< dynconend
; dyncon
++)
959 Elf_Internal_Dyn dyn
;
961 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
963 if (dyn
.d_tag
== DT_NEEDED
964 && dyn
.d_un
.d_val
== strindex
)
968 if (extversym
!= NULL
)
975 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
979 /* Save the SONAME, if there is one, because sometimes the
980 linker emulation code will need to know it. */
982 name
= bfd_get_filename (abfd
);
983 elf_dt_name (abfd
) = name
;
987 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
989 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
990 != extsymcount
* sizeof (Elf_External_Sym
)))
995 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
996 esymend
= buf
+ extsymcount
;
999 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1001 Elf_Internal_Sym sym
;
1007 struct elf_link_hash_entry
*h
;
1009 boolean size_change_ok
, type_change_ok
;
1010 boolean new_weakdef
;
1011 unsigned int old_alignment
;
1013 elf_swap_symbol_in (abfd
, esym
, &sym
);
1015 flags
= BSF_NO_FLAGS
;
1017 value
= sym
.st_value
;
1020 bind
= ELF_ST_BIND (sym
.st_info
);
1021 if (bind
== STB_LOCAL
)
1023 /* This should be impossible, since ELF requires that all
1024 global symbols follow all local symbols, and that sh_info
1025 point to the first global symbol. Unfortunatealy, Irix 5
1029 else if (bind
== STB_GLOBAL
)
1031 if (sym
.st_shndx
!= SHN_UNDEF
1032 && sym
.st_shndx
!= SHN_COMMON
)
1037 else if (bind
== STB_WEAK
)
1041 /* Leave it up to the processor backend. */
1044 if (sym
.st_shndx
== SHN_UNDEF
)
1045 sec
= bfd_und_section_ptr
;
1046 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1048 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1050 sec
= bfd_abs_section_ptr
;
1051 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1054 else if (sym
.st_shndx
== SHN_ABS
)
1055 sec
= bfd_abs_section_ptr
;
1056 else if (sym
.st_shndx
== SHN_COMMON
)
1058 sec
= bfd_com_section_ptr
;
1059 /* What ELF calls the size we call the value. What ELF
1060 calls the value we call the alignment. */
1061 value
= sym
.st_size
;
1065 /* Leave it up to the processor backend. */
1068 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1069 if (name
== (const char *) NULL
)
1072 if (add_symbol_hook
)
1074 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1078 /* The hook function sets the name to NULL if this symbol
1079 should be skipped for some reason. */
1080 if (name
== (const char *) NULL
)
1084 /* Sanity check that all possibilities were handled. */
1085 if (sec
== (asection
*) NULL
)
1087 bfd_set_error (bfd_error_bad_value
);
1091 if (bfd_is_und_section (sec
)
1092 || bfd_is_com_section (sec
))
1097 size_change_ok
= false;
1098 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1100 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1102 Elf_Internal_Versym iver
;
1103 unsigned int vernum
= 0;
1108 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1109 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1111 /* If this is a hidden symbol, or if it is not version
1112 1, we append the version name to the symbol name.
1113 However, we do not modify a non-hidden absolute
1114 symbol, because it might be the version symbol
1115 itself. FIXME: What if it isn't? */
1116 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1117 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1120 int namelen
, newlen
;
1123 if (sym
.st_shndx
!= SHN_UNDEF
)
1125 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1127 (*_bfd_error_handler
)
1128 (_("%s: %s: invalid version %u (max %d)"),
1129 abfd
->filename
, name
, vernum
,
1130 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1131 bfd_set_error (bfd_error_bad_value
);
1134 else if (vernum
> 1)
1136 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1142 /* We cannot simply test for the number of
1143 entries in the VERNEED section since the
1144 numbers for the needed versions do not start
1146 Elf_Internal_Verneed
*t
;
1149 for (t
= elf_tdata (abfd
)->verref
;
1153 Elf_Internal_Vernaux
*a
;
1155 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1157 if (a
->vna_other
== vernum
)
1159 verstr
= a
->vna_nodename
;
1168 (*_bfd_error_handler
)
1169 (_("%s: %s: invalid needed version %d"),
1170 abfd
->filename
, name
, vernum
);
1171 bfd_set_error (bfd_error_bad_value
);
1176 namelen
= strlen (name
);
1177 newlen
= namelen
+ strlen (verstr
) + 2;
1178 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1181 newname
= (char *) bfd_alloc (abfd
, newlen
);
1182 if (newname
== NULL
)
1184 strcpy (newname
, name
);
1185 p
= newname
+ namelen
;
1187 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1195 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1196 sym_hash
, &override
, &type_change_ok
,
1204 while (h
->root
.type
== bfd_link_hash_indirect
1205 || h
->root
.type
== bfd_link_hash_warning
)
1206 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1208 /* Remember the old alignment if this is a common symbol, so
1209 that we don't reduce the alignment later on. We can't
1210 check later, because _bfd_generic_link_add_one_symbol
1211 will set a default for the alignment which we want to
1213 if (h
->root
.type
== bfd_link_hash_common
)
1214 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1216 if (elf_tdata (abfd
)->verdef
!= NULL
1220 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1223 if (! (_bfd_generic_link_add_one_symbol
1224 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1225 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1229 while (h
->root
.type
== bfd_link_hash_indirect
1230 || h
->root
.type
== bfd_link_hash_warning
)
1231 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1234 new_weakdef
= false;
1237 && (flags
& BSF_WEAK
) != 0
1238 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1239 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1240 && h
->weakdef
== NULL
)
1242 /* Keep a list of all weak defined non function symbols from
1243 a dynamic object, using the weakdef field. Later in this
1244 function we will set the weakdef field to the correct
1245 value. We only put non-function symbols from dynamic
1246 objects on this list, because that happens to be the only
1247 time we need to know the normal symbol corresponding to a
1248 weak symbol, and the information is time consuming to
1249 figure out. If the weakdef field is not already NULL,
1250 then this symbol was already defined by some previous
1251 dynamic object, and we will be using that previous
1252 definition anyhow. */
1259 /* Set the alignment of a common symbol. */
1260 if (sym
.st_shndx
== SHN_COMMON
1261 && h
->root
.type
== bfd_link_hash_common
)
1265 align
= bfd_log2 (sym
.st_value
);
1266 if (align
> old_alignment
)
1267 h
->root
.u
.c
.p
->alignment_power
= align
;
1270 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1276 /* Remember the symbol size and type. */
1277 if (sym
.st_size
!= 0
1278 && (definition
|| h
->size
== 0))
1280 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1281 (*_bfd_error_handler
)
1282 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1283 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1284 bfd_get_filename (abfd
));
1286 h
->size
= sym
.st_size
;
1289 /* If this is a common symbol, then we always want H->SIZE
1290 to be the size of the common symbol. The code just above
1291 won't fix the size if a common symbol becomes larger. We
1292 don't warn about a size change here, because that is
1293 covered by --warn-common. */
1294 if (h
->root
.type
== bfd_link_hash_common
)
1295 h
->size
= h
->root
.u
.c
.size
;
1297 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1298 && (definition
|| h
->type
== STT_NOTYPE
))
1300 if (h
->type
!= STT_NOTYPE
1301 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1302 && ! type_change_ok
)
1303 (*_bfd_error_handler
)
1304 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1305 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1306 bfd_get_filename (abfd
));
1308 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1311 if (sym
.st_other
!= 0
1312 && (definition
|| h
->other
== 0))
1313 h
->other
= sym
.st_other
;
1315 /* Set a flag in the hash table entry indicating the type of
1316 reference or definition we just found. Keep a count of
1317 the number of dynamic symbols we find. A dynamic symbol
1318 is one which is referenced or defined by both a regular
1319 object and a shared object. */
1320 old_flags
= h
->elf_link_hash_flags
;
1325 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1327 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1329 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1330 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1336 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1338 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1339 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1340 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1341 || (h
->weakdef
!= NULL
1343 && h
->weakdef
->dynindx
!= -1))
1347 h
->elf_link_hash_flags
|= new_flag
;
1349 /* If this symbol has a version, and it is the default
1350 version, we create an indirect symbol from the default
1351 name to the fully decorated name. This will cause
1352 external references which do not specify a version to be
1353 bound to this version of the symbol. */
1358 p
= strchr (name
, ELF_VER_CHR
);
1359 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1362 struct elf_link_hash_entry
*hi
;
1365 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1367 if (shortname
== NULL
)
1369 strncpy (shortname
, name
, p
- name
);
1370 shortname
[p
- name
] = '\0';
1372 /* We are going to create a new symbol. Merge it
1373 with any existing symbol with this name. For the
1374 purposes of the merge, act as though we were
1375 defining the symbol we just defined, although we
1376 actually going to define an indirect symbol. */
1377 type_change_ok
= false;
1378 size_change_ok
= false;
1379 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1380 &value
, &hi
, &override
,
1381 &type_change_ok
, &size_change_ok
))
1386 if (! (_bfd_generic_link_add_one_symbol
1387 (info
, abfd
, shortname
, BSF_INDIRECT
,
1388 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1389 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1394 /* In this case the symbol named SHORTNAME is
1395 overriding the indirect symbol we want to
1396 add. We were planning on making SHORTNAME an
1397 indirect symbol referring to NAME. SHORTNAME
1398 is the name without a version. NAME is the
1399 fully versioned name, and it is the default
1402 Overriding means that we already saw a
1403 definition for the symbol SHORTNAME in a
1404 regular object, and it is overriding the
1405 symbol defined in the dynamic object.
1407 When this happens, we actually want to change
1408 NAME, the symbol we just added, to refer to
1409 SHORTNAME. This will cause references to
1410 NAME in the shared object to become
1411 references to SHORTNAME in the regular
1412 object. This is what we expect when we
1413 override a function in a shared object: that
1414 the references in the shared object will be
1415 mapped to the definition in the regular
1418 while (hi
->root
.type
== bfd_link_hash_indirect
1419 || hi
->root
.type
== bfd_link_hash_warning
)
1420 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1422 h
->root
.type
= bfd_link_hash_indirect
;
1423 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1424 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1426 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1427 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1428 if (hi
->elf_link_hash_flags
1429 & (ELF_LINK_HASH_REF_REGULAR
1430 | ELF_LINK_HASH_DEF_REGULAR
))
1432 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1438 /* Now set HI to H, so that the following code
1439 will set the other fields correctly. */
1443 /* If there is a duplicate definition somewhere,
1444 then HI may not point to an indirect symbol. We
1445 will have reported an error to the user in that
1448 if (hi
->root
.type
== bfd_link_hash_indirect
)
1450 struct elf_link_hash_entry
*ht
;
1452 /* If the symbol became indirect, then we assume
1453 that we have not seen a definition before. */
1454 BFD_ASSERT ((hi
->elf_link_hash_flags
1455 & (ELF_LINK_HASH_DEF_DYNAMIC
1456 | ELF_LINK_HASH_DEF_REGULAR
))
1459 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1461 /* Copy down any references that we may have
1462 already seen to the symbol which just became
1464 ht
->elf_link_hash_flags
|=
1465 (hi
->elf_link_hash_flags
1466 & (ELF_LINK_HASH_REF_DYNAMIC
1467 | ELF_LINK_HASH_REF_REGULAR
));
1469 /* Copy over the global and procedure linkage table
1470 offset entries. These may have been already set
1471 up by a check_relocs routine. */
1472 if (ht
->got
.offset
== (bfd_vma
) -1)
1474 ht
->got
.offset
= hi
->got
.offset
;
1475 hi
->got
.offset
= (bfd_vma
) -1;
1477 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1479 if (ht
->plt
.offset
== (bfd_vma
) -1)
1481 ht
->plt
.offset
= hi
->plt
.offset
;
1482 hi
->plt
.offset
= (bfd_vma
) -1;
1484 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1486 if (ht
->dynindx
== -1)
1488 ht
->dynindx
= hi
->dynindx
;
1489 ht
->dynstr_index
= hi
->dynstr_index
;
1491 hi
->dynstr_index
= 0;
1493 BFD_ASSERT (hi
->dynindx
== -1);
1495 /* FIXME: There may be other information to copy
1496 over for particular targets. */
1498 /* See if the new flags lead us to realize that
1499 the symbol must be dynamic. */
1505 || ((hi
->elf_link_hash_flags
1506 & ELF_LINK_HASH_REF_DYNAMIC
)
1512 if ((hi
->elf_link_hash_flags
1513 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1519 /* We also need to define an indirection from the
1520 nondefault version of the symbol. */
1522 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1524 if (shortname
== NULL
)
1526 strncpy (shortname
, name
, p
- name
);
1527 strcpy (shortname
+ (p
- name
), p
+ 1);
1529 /* Once again, merge with any existing symbol. */
1530 type_change_ok
= false;
1531 size_change_ok
= false;
1532 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1533 &value
, &hi
, &override
,
1534 &type_change_ok
, &size_change_ok
))
1539 /* Here SHORTNAME is a versioned name, so we
1540 don't expect to see the type of override we
1541 do in the case above. */
1542 (*_bfd_error_handler
)
1543 (_("%s: warning: unexpected redefinition of `%s'"),
1544 bfd_get_filename (abfd
), shortname
);
1548 if (! (_bfd_generic_link_add_one_symbol
1549 (info
, abfd
, shortname
, BSF_INDIRECT
,
1550 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1551 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1554 /* If there is a duplicate definition somewhere,
1555 then HI may not point to an indirect symbol.
1556 We will have reported an error to the user in
1559 if (hi
->root
.type
== bfd_link_hash_indirect
)
1561 /* If the symbol became indirect, then we
1562 assume that we have not seen a definition
1564 BFD_ASSERT ((hi
->elf_link_hash_flags
1565 & (ELF_LINK_HASH_DEF_DYNAMIC
1566 | ELF_LINK_HASH_DEF_REGULAR
))
1569 /* Copy down any references that we may have
1570 already seen to the symbol which just
1572 h
->elf_link_hash_flags
|=
1573 (hi
->elf_link_hash_flags
1574 & (ELF_LINK_HASH_REF_DYNAMIC
1575 | ELF_LINK_HASH_REF_REGULAR
));
1577 /* Copy over the global and procedure linkage
1578 table offset entries. These may have been
1579 already set up by a check_relocs routine. */
1580 if (h
->got
.offset
== (bfd_vma
) -1)
1582 h
->got
.offset
= hi
->got
.offset
;
1583 hi
->got
.offset
= (bfd_vma
) -1;
1585 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1587 if (h
->plt
.offset
== (bfd_vma
) -1)
1589 h
->plt
.offset
= hi
->plt
.offset
;
1590 hi
->plt
.offset
= (bfd_vma
) -1;
1592 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1594 if (h
->dynindx
== -1)
1596 h
->dynindx
= hi
->dynindx
;
1597 h
->dynstr_index
= hi
->dynstr_index
;
1599 hi
->dynstr_index
= 0;
1601 BFD_ASSERT (hi
->dynindx
== -1);
1603 /* FIXME: There may be other information to
1604 copy over for particular targets. */
1606 /* See if the new flags lead us to realize
1607 that the symbol must be dynamic. */
1613 || ((hi
->elf_link_hash_flags
1614 & ELF_LINK_HASH_REF_DYNAMIC
)
1620 if ((hi
->elf_link_hash_flags
1621 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1630 if (dynsym
&& h
->dynindx
== -1)
1632 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1634 if (h
->weakdef
!= NULL
1636 && h
->weakdef
->dynindx
== -1)
1638 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1646 /* Now set the weakdefs field correctly for all the weak defined
1647 symbols we found. The only way to do this is to search all the
1648 symbols. Since we only need the information for non functions in
1649 dynamic objects, that's the only time we actually put anything on
1650 the list WEAKS. We need this information so that if a regular
1651 object refers to a symbol defined weakly in a dynamic object, the
1652 real symbol in the dynamic object is also put in the dynamic
1653 symbols; we also must arrange for both symbols to point to the
1654 same memory location. We could handle the general case of symbol
1655 aliasing, but a general symbol alias can only be generated in
1656 assembler code, handling it correctly would be very time
1657 consuming, and other ELF linkers don't handle general aliasing
1659 while (weaks
!= NULL
)
1661 struct elf_link_hash_entry
*hlook
;
1664 struct elf_link_hash_entry
**hpp
;
1665 struct elf_link_hash_entry
**hppend
;
1668 weaks
= hlook
->weakdef
;
1669 hlook
->weakdef
= NULL
;
1671 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1672 || hlook
->root
.type
== bfd_link_hash_defweak
1673 || hlook
->root
.type
== bfd_link_hash_common
1674 || hlook
->root
.type
== bfd_link_hash_indirect
);
1675 slook
= hlook
->root
.u
.def
.section
;
1676 vlook
= hlook
->root
.u
.def
.value
;
1678 hpp
= elf_sym_hashes (abfd
);
1679 hppend
= hpp
+ extsymcount
;
1680 for (; hpp
< hppend
; hpp
++)
1682 struct elf_link_hash_entry
*h
;
1685 if (h
!= NULL
&& h
!= hlook
1686 && h
->root
.type
== bfd_link_hash_defined
1687 && h
->root
.u
.def
.section
== slook
1688 && h
->root
.u
.def
.value
== vlook
)
1692 /* If the weak definition is in the list of dynamic
1693 symbols, make sure the real definition is put there
1695 if (hlook
->dynindx
!= -1
1696 && h
->dynindx
== -1)
1698 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1702 /* If the real definition is in the list of dynamic
1703 symbols, make sure the weak definition is put there
1704 as well. If we don't do this, then the dynamic
1705 loader might not merge the entries for the real
1706 definition and the weak definition. */
1707 if (h
->dynindx
!= -1
1708 && hlook
->dynindx
== -1)
1710 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1725 if (extversym
!= NULL
)
1731 /* If this object is the same format as the output object, and it is
1732 not a shared library, then let the backend look through the
1735 This is required to build global offset table entries and to
1736 arrange for dynamic relocs. It is not required for the
1737 particular common case of linking non PIC code, even when linking
1738 against shared libraries, but unfortunately there is no way of
1739 knowing whether an object file has been compiled PIC or not.
1740 Looking through the relocs is not particularly time consuming.
1741 The problem is that we must either (1) keep the relocs in memory,
1742 which causes the linker to require additional runtime memory or
1743 (2) read the relocs twice from the input file, which wastes time.
1744 This would be a good case for using mmap.
1746 I have no idea how to handle linking PIC code into a file of a
1747 different format. It probably can't be done. */
1748 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1750 && abfd
->xvec
== info
->hash
->creator
1751 && check_relocs
!= NULL
)
1755 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1757 Elf_Internal_Rela
*internal_relocs
;
1760 if ((o
->flags
& SEC_RELOC
) == 0
1761 || o
->reloc_count
== 0
1762 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1763 && (o
->flags
& SEC_DEBUGGING
) != 0)
1764 || bfd_is_abs_section (o
->output_section
))
1767 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1768 (abfd
, o
, (PTR
) NULL
,
1769 (Elf_Internal_Rela
*) NULL
,
1770 info
->keep_memory
));
1771 if (internal_relocs
== NULL
)
1774 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1776 if (! info
->keep_memory
)
1777 free (internal_relocs
);
1784 /* If this is a non-traditional, non-relocateable link, try to
1785 optimize the handling of the .stab/.stabstr sections. */
1787 && ! info
->relocateable
1788 && ! info
->traditional_format
1789 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1790 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1792 asection
*stab
, *stabstr
;
1794 stab
= bfd_get_section_by_name (abfd
, ".stab");
1797 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1799 if (stabstr
!= NULL
)
1801 struct bfd_elf_section_data
*secdata
;
1803 secdata
= elf_section_data (stab
);
1804 if (! _bfd_link_section_stabs (abfd
,
1805 &elf_hash_table (info
)->stab_info
,
1807 &secdata
->stab_info
))
1822 if (extversym
!= NULL
)
1827 /* Create some sections which will be filled in with dynamic linking
1828 information. ABFD is an input file which requires dynamic sections
1829 to be created. The dynamic sections take up virtual memory space
1830 when the final executable is run, so we need to create them before
1831 addresses are assigned to the output sections. We work out the
1832 actual contents and size of these sections later. */
1835 elf_link_create_dynamic_sections (abfd
, info
)
1837 struct bfd_link_info
*info
;
1840 register asection
*s
;
1841 struct elf_link_hash_entry
*h
;
1842 struct elf_backend_data
*bed
;
1844 if (elf_hash_table (info
)->dynamic_sections_created
)
1847 /* Make sure that all dynamic sections use the same input BFD. */
1848 if (elf_hash_table (info
)->dynobj
== NULL
)
1849 elf_hash_table (info
)->dynobj
= abfd
;
1851 abfd
= elf_hash_table (info
)->dynobj
;
1853 /* Note that we set the SEC_IN_MEMORY flag for all of these
1855 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1856 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1858 /* A dynamically linked executable has a .interp section, but a
1859 shared library does not. */
1862 s
= bfd_make_section (abfd
, ".interp");
1864 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1868 /* Create sections to hold version informations. These are removed
1869 if they are not needed. */
1870 s
= bfd_make_section (abfd
, ".gnu.version_d");
1872 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1873 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1876 s
= bfd_make_section (abfd
, ".gnu.version");
1878 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1879 || ! bfd_set_section_alignment (abfd
, s
, 1))
1882 s
= bfd_make_section (abfd
, ".gnu.version_r");
1884 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1885 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1888 s
= bfd_make_section (abfd
, ".dynsym");
1890 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1891 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1894 s
= bfd_make_section (abfd
, ".dynstr");
1896 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1899 /* Create a strtab to hold the dynamic symbol names. */
1900 if (elf_hash_table (info
)->dynstr
== NULL
)
1902 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1903 if (elf_hash_table (info
)->dynstr
== NULL
)
1907 s
= bfd_make_section (abfd
, ".dynamic");
1909 || ! bfd_set_section_flags (abfd
, s
, flags
)
1910 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1913 /* The special symbol _DYNAMIC is always set to the start of the
1914 .dynamic section. This call occurs before we have processed the
1915 symbols for any dynamic object, so we don't have to worry about
1916 overriding a dynamic definition. We could set _DYNAMIC in a
1917 linker script, but we only want to define it if we are, in fact,
1918 creating a .dynamic section. We don't want to define it if there
1919 is no .dynamic section, since on some ELF platforms the start up
1920 code examines it to decide how to initialize the process. */
1922 if (! (_bfd_generic_link_add_one_symbol
1923 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1924 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1925 (struct bfd_link_hash_entry
**) &h
)))
1927 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1928 h
->type
= STT_OBJECT
;
1931 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1934 s
= bfd_make_section (abfd
, ".hash");
1936 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1937 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1940 /* Let the backend create the rest of the sections. This lets the
1941 backend set the right flags. The backend will normally create
1942 the .got and .plt sections. */
1943 bed
= get_elf_backend_data (abfd
);
1944 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1947 elf_hash_table (info
)->dynamic_sections_created
= true;
1952 /* Add an entry to the .dynamic table. */
1955 elf_add_dynamic_entry (info
, tag
, val
)
1956 struct bfd_link_info
*info
;
1960 Elf_Internal_Dyn dyn
;
1964 bfd_byte
*newcontents
;
1966 dynobj
= elf_hash_table (info
)->dynobj
;
1968 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1969 BFD_ASSERT (s
!= NULL
);
1971 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1972 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1973 if (newcontents
== NULL
)
1977 dyn
.d_un
.d_val
= val
;
1978 elf_swap_dyn_out (dynobj
, &dyn
,
1979 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1981 s
->_raw_size
= newsize
;
1982 s
->contents
= newcontents
;
1988 /* Read and swap the relocs for a section. They may have been cached.
1989 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1990 they are used as buffers to read into. They are known to be large
1991 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1992 value is allocated using either malloc or bfd_alloc, according to
1993 the KEEP_MEMORY argument. */
1996 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2000 PTR external_relocs
;
2001 Elf_Internal_Rela
*internal_relocs
;
2002 boolean keep_memory
;
2004 Elf_Internal_Shdr
*rel_hdr
;
2006 Elf_Internal_Rela
*alloc2
= NULL
;
2008 if (elf_section_data (o
)->relocs
!= NULL
)
2009 return elf_section_data (o
)->relocs
;
2011 if (o
->reloc_count
== 0)
2014 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2016 if (internal_relocs
== NULL
)
2020 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2022 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2024 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2025 if (internal_relocs
== NULL
)
2029 if (external_relocs
== NULL
)
2031 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2034 external_relocs
= alloc1
;
2037 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2038 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2039 != rel_hdr
->sh_size
))
2042 /* Swap in the relocs. For convenience, we always produce an
2043 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2045 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2047 Elf_External_Rel
*erel
;
2048 Elf_External_Rel
*erelend
;
2049 Elf_Internal_Rela
*irela
;
2051 erel
= (Elf_External_Rel
*) external_relocs
;
2052 erelend
= erel
+ o
->reloc_count
;
2053 irela
= internal_relocs
;
2054 for (; erel
< erelend
; erel
++, irela
++)
2056 Elf_Internal_Rel irel
;
2058 elf_swap_reloc_in (abfd
, erel
, &irel
);
2059 irela
->r_offset
= irel
.r_offset
;
2060 irela
->r_info
= irel
.r_info
;
2061 irela
->r_addend
= 0;
2066 Elf_External_Rela
*erela
;
2067 Elf_External_Rela
*erelaend
;
2068 Elf_Internal_Rela
*irela
;
2070 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2072 erela
= (Elf_External_Rela
*) external_relocs
;
2073 erelaend
= erela
+ o
->reloc_count
;
2074 irela
= internal_relocs
;
2075 for (; erela
< erelaend
; erela
++, irela
++)
2076 elf_swap_reloca_in (abfd
, erela
, irela
);
2079 /* Cache the results for next time, if we can. */
2081 elf_section_data (o
)->relocs
= internal_relocs
;
2086 /* Don't free alloc2, since if it was allocated we are passing it
2087 back (under the name of internal_relocs). */
2089 return internal_relocs
;
2100 /* Record an assignment to a symbol made by a linker script. We need
2101 this in case some dynamic object refers to this symbol. */
2105 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2107 struct bfd_link_info
*info
;
2111 struct elf_link_hash_entry
*h
;
2113 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2116 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2120 if (h
->root
.type
== bfd_link_hash_new
)
2121 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2123 /* If this symbol is being provided by the linker script, and it is
2124 currently defined by a dynamic object, but not by a regular
2125 object, then mark it as undefined so that the generic linker will
2126 force the correct value. */
2128 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2129 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2130 h
->root
.type
= bfd_link_hash_undefined
;
2132 /* If this symbol is not being provided by the linker script, and it is
2133 currently defined by a dynamic object, but not by a regular object,
2134 then clear out any version information because the symbol will not be
2135 associated with the dynamic object any more. */
2137 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2138 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2139 h
->verinfo
.verdef
= NULL
;
2141 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2142 h
->type
= STT_OBJECT
;
2144 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2145 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2147 && h
->dynindx
== -1)
2149 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2152 /* If this is a weak defined symbol, and we know a corresponding
2153 real symbol from the same dynamic object, make sure the real
2154 symbol is also made into a dynamic symbol. */
2155 if (h
->weakdef
!= NULL
2156 && h
->weakdef
->dynindx
== -1)
2158 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2166 /* This structure is used to pass information to
2167 elf_link_assign_sym_version. */
2169 struct elf_assign_sym_version_info
2173 /* General link information. */
2174 struct bfd_link_info
*info
;
2176 struct bfd_elf_version_tree
*verdefs
;
2177 /* Whether we are exporting all dynamic symbols. */
2178 boolean export_dynamic
;
2179 /* Whether we removed any symbols from the dynamic symbol table. */
2180 boolean removed_dynamic
;
2181 /* Whether we had a failure. */
2185 /* This structure is used to pass information to
2186 elf_link_find_version_dependencies. */
2188 struct elf_find_verdep_info
2192 /* General link information. */
2193 struct bfd_link_info
*info
;
2194 /* The number of dependencies. */
2196 /* Whether we had a failure. */
2200 /* Array used to determine the number of hash table buckets to use
2201 based on the number of symbols there are. If there are fewer than
2202 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2203 fewer than 37 we use 17 buckets, and so forth. We never use more
2204 than 32771 buckets. */
2206 static const size_t elf_buckets
[] =
2208 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2212 /* Compute bucket count for hashing table. We do not use a static set
2213 of possible tables sizes anymore. Instead we determine for all
2214 possible reasonable sizes of the table the outcome (i.e., the
2215 number of collisions etc) and choose the best solution. The
2216 weighting functions are not too simple to allow the table to grow
2217 without bounds. Instead one of the weighting factors is the size.
2218 Therefore the result is always a good payoff between few collisions
2219 (= short chain lengths) and table size. */
2221 compute_bucket_count (info
)
2222 struct bfd_link_info
*info
;
2224 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2226 unsigned long int *hashcodes
;
2227 unsigned long int *hashcodesp
;
2228 unsigned long int i
;
2230 /* Compute the hash values for all exported symbols. At the same
2231 time store the values in an array so that we could use them for
2233 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2234 * sizeof (unsigned long int));
2235 if (hashcodes
== NULL
)
2237 hashcodesp
= hashcodes
;
2239 /* Put all hash values in HASHCODES. */
2240 elf_link_hash_traverse (elf_hash_table (info
),
2241 elf_collect_hash_codes
, &hashcodesp
);
2243 /* We have a problem here. The following code to optimize the table
2244 size requires an integer type with more the 32 bits. If
2245 BFD_HOST_U_64_BIT is set we know about such a type. */
2246 #ifdef BFD_HOST_U_64_BIT
2247 if (info
->optimize
== true)
2249 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2252 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2253 unsigned long int *counts
;
2255 /* Possible optimization parameters: if we have NSYMS symbols we say
2256 that the hashing table must at least have NSYMS/4 and at most
2258 minsize
= nsyms
/ 4;
2261 best_size
= maxsize
= nsyms
* 2;
2263 /* Create array where we count the collisions in. We must use bfd_malloc
2264 since the size could be large. */
2265 counts
= (unsigned long int *) bfd_malloc (maxsize
2266 * sizeof (unsigned long int));
2273 /* Compute the "optimal" size for the hash table. The criteria is a
2274 minimal chain length. The minor criteria is (of course) the size
2276 for (i
= minsize
; i
< maxsize
; ++i
)
2278 /* Walk through the array of hashcodes and count the collisions. */
2279 BFD_HOST_U_64_BIT max
;
2280 unsigned long int j
;
2281 unsigned long int fact
;
2283 memset (counts
, '\0', i
* sizeof (unsigned long int));
2285 /* Determine how often each hash bucket is used. */
2286 for (j
= 0; j
< nsyms
; ++j
)
2287 ++counts
[hashcodes
[j
] % i
];
2289 /* For the weight function we need some information about the
2290 pagesize on the target. This is information need not be 100%
2291 accurate. Since this information is not available (so far) we
2292 define it here to a reasonable default value. If it is crucial
2293 to have a better value some day simply define this value. */
2294 # ifndef BFD_TARGET_PAGESIZE
2295 # define BFD_TARGET_PAGESIZE (4096)
2298 /* We in any case need 2 + NSYMS entries for the size values and
2300 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2303 /* Variant 1: optimize for short chains. We add the squares
2304 of all the chain lengths (which favous many small chain
2305 over a few long chains). */
2306 for (j
= 0; j
< i
; ++j
)
2307 max
+= counts
[j
] * counts
[j
];
2309 /* This adds penalties for the overall size of the table. */
2310 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2313 /* Variant 2: Optimize a lot more for small table. Here we
2314 also add squares of the size but we also add penalties for
2315 empty slots (the +1 term). */
2316 for (j
= 0; j
< i
; ++j
)
2317 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2319 /* The overall size of the table is considered, but not as
2320 strong as in variant 1, where it is squared. */
2321 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2325 /* Compare with current best results. */
2326 if (max
< best_chlen
)
2336 #endif /* defined (BFD_HOST_U_64_BIT) */
2338 /* This is the fallback solution if no 64bit type is available or if we
2339 are not supposed to spend much time on optimizations. We select the
2340 bucket count using a fixed set of numbers. */
2341 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2343 best_size
= elf_buckets
[i
];
2344 if (dynsymcount
< elf_buckets
[i
+ 1])
2349 /* Free the arrays we needed. */
2355 /* Set up the sizes and contents of the ELF dynamic sections. This is
2356 called by the ELF linker emulation before_allocation routine. We
2357 must set the sizes of the sections before the linker sets the
2358 addresses of the various sections. */
2361 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2362 export_dynamic
, filter_shlib
,
2363 auxiliary_filters
, info
, sinterpptr
,
2368 boolean export_dynamic
;
2369 const char *filter_shlib
;
2370 const char * const *auxiliary_filters
;
2371 struct bfd_link_info
*info
;
2372 asection
**sinterpptr
;
2373 struct bfd_elf_version_tree
*verdefs
;
2375 bfd_size_type soname_indx
;
2377 struct elf_backend_data
*bed
;
2378 bfd_size_type old_dynsymcount
;
2379 struct elf_assign_sym_version_info asvinfo
;
2383 soname_indx
= (bfd_size_type
) -1;
2385 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2388 /* The backend may have to create some sections regardless of whether
2389 we're dynamic or not. */
2390 bed
= get_elf_backend_data (output_bfd
);
2391 if (bed
->elf_backend_always_size_sections
2392 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2395 dynobj
= elf_hash_table (info
)->dynobj
;
2397 /* If there were no dynamic objects in the link, there is nothing to
2402 /* If we are supposed to export all symbols into the dynamic symbol
2403 table (this is not the normal case), then do so. */
2406 struct elf_info_failed eif
;
2410 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2416 if (elf_hash_table (info
)->dynamic_sections_created
)
2418 struct elf_info_failed eif
;
2419 struct elf_link_hash_entry
*h
;
2420 bfd_size_type strsize
;
2422 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2423 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2427 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2428 soname
, true, true);
2429 if (soname_indx
== (bfd_size_type
) -1
2430 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2436 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2444 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2446 if (indx
== (bfd_size_type
) -1
2447 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2451 if (filter_shlib
!= NULL
)
2455 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2456 filter_shlib
, true, true);
2457 if (indx
== (bfd_size_type
) -1
2458 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2462 if (auxiliary_filters
!= NULL
)
2464 const char * const *p
;
2466 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2470 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2472 if (indx
== (bfd_size_type
) -1
2473 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2478 /* Attach all the symbols to their version information. */
2479 asvinfo
.output_bfd
= output_bfd
;
2480 asvinfo
.info
= info
;
2481 asvinfo
.verdefs
= verdefs
;
2482 asvinfo
.export_dynamic
= export_dynamic
;
2483 asvinfo
.removed_dynamic
= false;
2484 asvinfo
.failed
= false;
2486 elf_link_hash_traverse (elf_hash_table (info
),
2487 elf_link_assign_sym_version
,
2492 /* Find all symbols which were defined in a dynamic object and make
2493 the backend pick a reasonable value for them. */
2496 elf_link_hash_traverse (elf_hash_table (info
),
2497 elf_adjust_dynamic_symbol
,
2502 /* Add some entries to the .dynamic section. We fill in some of the
2503 values later, in elf_bfd_final_link, but we must add the entries
2504 now so that we know the final size of the .dynamic section. */
2505 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2508 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2509 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2511 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2514 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2517 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2518 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2520 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2523 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2524 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2525 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2526 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2527 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2528 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2529 sizeof (Elf_External_Sym
)))
2533 /* The backend must work out the sizes of all the other dynamic
2535 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2536 if (bed
->elf_backend_size_dynamic_sections
2537 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2540 if (elf_hash_table (info
)->dynamic_sections_created
)
2545 size_t bucketcount
= 0;
2546 Elf_Internal_Sym isym
;
2548 /* Set up the version definition section. */
2549 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2550 BFD_ASSERT (s
!= NULL
);
2552 /* We may have created additional version definitions if we are
2553 just linking a regular application. */
2554 verdefs
= asvinfo
.verdefs
;
2556 if (verdefs
== NULL
)
2560 /* Don't include this section in the output file. */
2561 for (spp
= &output_bfd
->sections
;
2562 *spp
!= s
->output_section
;
2563 spp
= &(*spp
)->next
)
2565 *spp
= s
->output_section
->next
;
2566 --output_bfd
->section_count
;
2572 struct bfd_elf_version_tree
*t
;
2574 Elf_Internal_Verdef def
;
2575 Elf_Internal_Verdaux defaux
;
2577 if (asvinfo
.removed_dynamic
)
2579 /* Some dynamic symbols were changed to be local
2580 symbols. In this case, we renumber all of the
2581 dynamic symbols, so that we don't have a hole. If
2582 the backend changed dynsymcount, then assume that the
2583 new symbols are at the start. This is the case on
2584 the MIPS. FIXME: The names of the removed symbols
2585 will still be in the dynamic string table, wasting
2587 elf_hash_table (info
)->dynsymcount
=
2588 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2589 elf_link_hash_traverse (elf_hash_table (info
),
2590 elf_link_renumber_dynsyms
,
2597 /* Make space for the base version. */
2598 size
+= sizeof (Elf_External_Verdef
);
2599 size
+= sizeof (Elf_External_Verdaux
);
2602 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2604 struct bfd_elf_version_deps
*n
;
2606 size
+= sizeof (Elf_External_Verdef
);
2607 size
+= sizeof (Elf_External_Verdaux
);
2610 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2611 size
+= sizeof (Elf_External_Verdaux
);
2614 s
->_raw_size
= size
;
2615 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2616 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2619 /* Fill in the version definition section. */
2623 def
.vd_version
= VER_DEF_CURRENT
;
2624 def
.vd_flags
= VER_FLG_BASE
;
2627 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2628 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2629 + sizeof (Elf_External_Verdaux
));
2631 if (soname_indx
!= (bfd_size_type
) -1)
2633 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2634 defaux
.vda_name
= soname_indx
;
2641 name
= output_bfd
->filename
;
2642 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2643 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2645 if (indx
== (bfd_size_type
) -1)
2647 defaux
.vda_name
= indx
;
2649 defaux
.vda_next
= 0;
2651 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2652 (Elf_External_Verdef
*)p
);
2653 p
+= sizeof (Elf_External_Verdef
);
2654 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2655 (Elf_External_Verdaux
*) p
);
2656 p
+= sizeof (Elf_External_Verdaux
);
2658 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2661 struct bfd_elf_version_deps
*n
;
2662 struct elf_link_hash_entry
*h
;
2665 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2668 /* Add a symbol representing this version. */
2670 if (! (_bfd_generic_link_add_one_symbol
2671 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2672 (bfd_vma
) 0, (const char *) NULL
, false,
2673 get_elf_backend_data (dynobj
)->collect
,
2674 (struct bfd_link_hash_entry
**) &h
)))
2676 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2677 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2678 h
->type
= STT_OBJECT
;
2679 h
->verinfo
.vertree
= t
;
2681 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2684 def
.vd_version
= VER_DEF_CURRENT
;
2686 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2687 def
.vd_flags
|= VER_FLG_WEAK
;
2688 def
.vd_ndx
= t
->vernum
+ 1;
2689 def
.vd_cnt
= cdeps
+ 1;
2690 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2691 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2692 if (t
->next
!= NULL
)
2693 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2694 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2698 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2699 (Elf_External_Verdef
*) p
);
2700 p
+= sizeof (Elf_External_Verdef
);
2702 defaux
.vda_name
= h
->dynstr_index
;
2703 if (t
->deps
== NULL
)
2704 defaux
.vda_next
= 0;
2706 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2707 t
->name_indx
= defaux
.vda_name
;
2709 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2710 (Elf_External_Verdaux
*) p
);
2711 p
+= sizeof (Elf_External_Verdaux
);
2713 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2715 if (n
->version_needed
== NULL
)
2717 /* This can happen if there was an error in the
2719 defaux
.vda_name
= 0;
2722 defaux
.vda_name
= n
->version_needed
->name_indx
;
2723 if (n
->next
== NULL
)
2724 defaux
.vda_next
= 0;
2726 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2728 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2729 (Elf_External_Verdaux
*) p
);
2730 p
+= sizeof (Elf_External_Verdaux
);
2734 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2735 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2738 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2741 /* Work out the size of the version reference section. */
2743 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2744 BFD_ASSERT (s
!= NULL
);
2746 struct elf_find_verdep_info sinfo
;
2748 sinfo
.output_bfd
= output_bfd
;
2750 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2751 if (sinfo
.vers
== 0)
2753 sinfo
.failed
= false;
2755 elf_link_hash_traverse (elf_hash_table (info
),
2756 elf_link_find_version_dependencies
,
2759 if (elf_tdata (output_bfd
)->verref
== NULL
)
2763 /* We don't have any version definitions, so we can just
2764 remove the section. */
2766 for (spp
= &output_bfd
->sections
;
2767 *spp
!= s
->output_section
;
2768 spp
= &(*spp
)->next
)
2770 *spp
= s
->output_section
->next
;
2771 --output_bfd
->section_count
;
2775 Elf_Internal_Verneed
*t
;
2780 /* Build the version definition section. */
2783 for (t
= elf_tdata (output_bfd
)->verref
;
2787 Elf_Internal_Vernaux
*a
;
2789 size
+= sizeof (Elf_External_Verneed
);
2791 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2792 size
+= sizeof (Elf_External_Vernaux
);
2795 s
->_raw_size
= size
;
2796 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2797 if (s
->contents
== NULL
)
2801 for (t
= elf_tdata (output_bfd
)->verref
;
2806 Elf_Internal_Vernaux
*a
;
2810 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2813 t
->vn_version
= VER_NEED_CURRENT
;
2815 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2816 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2817 elf_dt_name (t
->vn_bfd
),
2820 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2821 t
->vn_bfd
->filename
, true, false);
2822 if (indx
== (bfd_size_type
) -1)
2825 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2826 if (t
->vn_nextref
== NULL
)
2829 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2830 + caux
* sizeof (Elf_External_Vernaux
));
2832 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2833 (Elf_External_Verneed
*) p
);
2834 p
+= sizeof (Elf_External_Verneed
);
2836 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2838 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2840 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2841 a
->vna_nodename
, true, false);
2842 if (indx
== (bfd_size_type
) -1)
2845 if (a
->vna_nextptr
== NULL
)
2848 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2850 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2851 (Elf_External_Vernaux
*) p
);
2852 p
+= sizeof (Elf_External_Vernaux
);
2856 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2857 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2860 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2864 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2866 /* Work out the size of the symbol version section. */
2867 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2868 BFD_ASSERT (s
!= NULL
);
2869 if (dynsymcount
== 0
2870 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2874 /* We don't need any symbol versions; just discard the
2876 for (spp
= &output_bfd
->sections
;
2877 *spp
!= s
->output_section
;
2878 spp
= &(*spp
)->next
)
2880 *spp
= s
->output_section
->next
;
2881 --output_bfd
->section_count
;
2885 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2886 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2887 if (s
->contents
== NULL
)
2890 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2894 /* Set the size of the .dynsym and .hash sections. We counted
2895 the number of dynamic symbols in elf_link_add_object_symbols.
2896 We will build the contents of .dynsym and .hash when we build
2897 the final symbol table, because until then we do not know the
2898 correct value to give the symbols. We built the .dynstr
2899 section as we went along in elf_link_add_object_symbols. */
2900 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2901 BFD_ASSERT (s
!= NULL
);
2902 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2903 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2904 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2907 /* The first entry in .dynsym is a dummy symbol. */
2914 elf_swap_symbol_out (output_bfd
, &isym
,
2915 (PTR
) (Elf_External_Sym
*) s
->contents
);
2917 /* Compute the size of the hashing table. As a side effect this
2918 computes the hash values for all the names we export. */
2919 bucketcount
= compute_bucket_count (info
);
2921 s
= bfd_get_section_by_name (dynobj
, ".hash");
2922 BFD_ASSERT (s
!= NULL
);
2923 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2924 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2925 if (s
->contents
== NULL
)
2927 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2929 put_word (output_bfd
, bucketcount
, s
->contents
);
2930 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2932 elf_hash_table (info
)->bucketcount
= bucketcount
;
2934 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2935 BFD_ASSERT (s
!= NULL
);
2936 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2938 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2945 /* Fix up the flags for a symbol. This handles various cases which
2946 can only be fixed after all the input files are seen. This is
2947 currently called by both adjust_dynamic_symbol and
2948 assign_sym_version, which is unnecessary but perhaps more robust in
2949 the face of future changes. */
2952 elf_fix_symbol_flags (h
, eif
)
2953 struct elf_link_hash_entry
*h
;
2954 struct elf_info_failed
*eif
;
2956 /* If this symbol was mentioned in a non-ELF file, try to set
2957 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2958 permit a non-ELF file to correctly refer to a symbol defined in
2959 an ELF dynamic object. */
2960 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2962 if (h
->root
.type
!= bfd_link_hash_defined
2963 && h
->root
.type
!= bfd_link_hash_defweak
)
2964 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2967 if (h
->root
.u
.def
.section
->owner
!= NULL
2968 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2969 == bfd_target_elf_flavour
))
2970 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2972 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2975 if (h
->dynindx
== -1
2976 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2977 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2979 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2987 /* If this is a final link, and the symbol was defined as a common
2988 symbol in a regular object file, and there was no definition in
2989 any dynamic object, then the linker will have allocated space for
2990 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2991 flag will not have been set. */
2992 if (h
->root
.type
== bfd_link_hash_defined
2993 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2994 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2995 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2996 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2997 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2999 /* If -Bsymbolic was used (which means to bind references to global
3000 symbols to the definition within the shared object), and this
3001 symbol was defined in a regular object, then it actually doesn't
3002 need a PLT entry. */
3003 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3004 && eif
->info
->shared
3005 && eif
->info
->symbolic
3006 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3008 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3009 h
->plt
.offset
= (bfd_vma
) -1;
3015 /* Make the backend pick a good value for a dynamic symbol. This is
3016 called via elf_link_hash_traverse, and also calls itself
3020 elf_adjust_dynamic_symbol (h
, data
)
3021 struct elf_link_hash_entry
*h
;
3024 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3026 struct elf_backend_data
*bed
;
3028 /* Ignore indirect symbols. These are added by the versioning code. */
3029 if (h
->root
.type
== bfd_link_hash_indirect
)
3032 /* Fix the symbol flags. */
3033 if (! elf_fix_symbol_flags (h
, eif
))
3036 /* If this symbol does not require a PLT entry, and it is not
3037 defined by a dynamic object, or is not referenced by a regular
3038 object, ignore it. We do have to handle a weak defined symbol,
3039 even if no regular object refers to it, if we decided to add it
3040 to the dynamic symbol table. FIXME: Do we normally need to worry
3041 about symbols which are defined by one dynamic object and
3042 referenced by another one? */
3043 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3044 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3045 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3046 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3047 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3049 h
->plt
.offset
= (bfd_vma
) -1;
3053 /* If we've already adjusted this symbol, don't do it again. This
3054 can happen via a recursive call. */
3055 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3058 /* Don't look at this symbol again. Note that we must set this
3059 after checking the above conditions, because we may look at a
3060 symbol once, decide not to do anything, and then get called
3061 recursively later after REF_REGULAR is set below. */
3062 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3064 /* If this is a weak definition, and we know a real definition, and
3065 the real symbol is not itself defined by a regular object file,
3066 then get a good value for the real definition. We handle the
3067 real symbol first, for the convenience of the backend routine.
3069 Note that there is a confusing case here. If the real definition
3070 is defined by a regular object file, we don't get the real symbol
3071 from the dynamic object, but we do get the weak symbol. If the
3072 processor backend uses a COPY reloc, then if some routine in the
3073 dynamic object changes the real symbol, we will not see that
3074 change in the corresponding weak symbol. This is the way other
3075 ELF linkers work as well, and seems to be a result of the shared
3078 I will clarify this issue. Most SVR4 shared libraries define the
3079 variable _timezone and define timezone as a weak synonym. The
3080 tzset call changes _timezone. If you write
3081 extern int timezone;
3083 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3084 you might expect that, since timezone is a synonym for _timezone,
3085 the same number will print both times. However, if the processor
3086 backend uses a COPY reloc, then actually timezone will be copied
3087 into your process image, and, since you define _timezone
3088 yourself, _timezone will not. Thus timezone and _timezone will
3089 wind up at different memory locations. The tzset call will set
3090 _timezone, leaving timezone unchanged. */
3092 if (h
->weakdef
!= NULL
)
3094 struct elf_link_hash_entry
*weakdef
;
3096 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3097 || h
->root
.type
== bfd_link_hash_defweak
);
3098 weakdef
= h
->weakdef
;
3099 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3100 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3101 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3102 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3104 /* This symbol is defined by a regular object file, so we
3105 will not do anything special. Clear weakdef for the
3106 convenience of the processor backend. */
3111 /* There is an implicit reference by a regular object file
3112 via the weak symbol. */
3113 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3114 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3119 /* If a symbol has no type and no size and does not require a PLT
3120 entry, then we are probably about to do the wrong thing here: we
3121 are probably going to create a COPY reloc for an empty object.
3122 This case can arise when a shared object is built with assembly
3123 code, and the assembly code fails to set the symbol type. */
3125 && h
->type
== STT_NOTYPE
3126 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3127 (*_bfd_error_handler
)
3128 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3129 h
->root
.root
.string
);
3131 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3132 bed
= get_elf_backend_data (dynobj
);
3133 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3142 /* This routine is used to export all defined symbols into the dynamic
3143 symbol table. It is called via elf_link_hash_traverse. */
3146 elf_export_symbol (h
, data
)
3147 struct elf_link_hash_entry
*h
;
3150 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3152 /* Ignore indirect symbols. These are added by the versioning code. */
3153 if (h
->root
.type
== bfd_link_hash_indirect
)
3156 if (h
->dynindx
== -1
3157 && (h
->elf_link_hash_flags
3158 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3160 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3170 /* Look through the symbols which are defined in other shared
3171 libraries and referenced here. Update the list of version
3172 dependencies. This will be put into the .gnu.version_r section.
3173 This function is called via elf_link_hash_traverse. */
3176 elf_link_find_version_dependencies (h
, data
)
3177 struct elf_link_hash_entry
*h
;
3180 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3181 Elf_Internal_Verneed
*t
;
3182 Elf_Internal_Vernaux
*a
;
3184 /* We only care about symbols defined in shared objects with version
3186 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3187 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3189 || h
->verinfo
.verdef
== NULL
)
3192 /* See if we already know about this version. */
3193 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3195 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3198 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3199 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3205 /* This is a new version. Add it to tree we are building. */
3209 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3212 rinfo
->failed
= true;
3216 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3217 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3218 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3221 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3223 /* Note that we are copying a string pointer here, and testing it
3224 above. If bfd_elf_string_from_elf_section is ever changed to
3225 discard the string data when low in memory, this will have to be
3227 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3229 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3230 a
->vna_nextptr
= t
->vn_auxptr
;
3232 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3235 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3242 /* Figure out appropriate versions for all the symbols. We may not
3243 have the version number script until we have read all of the input
3244 files, so until that point we don't know which symbols should be
3245 local. This function is called via elf_link_hash_traverse. */
3248 elf_link_assign_sym_version (h
, data
)
3249 struct elf_link_hash_entry
*h
;
3252 struct elf_assign_sym_version_info
*sinfo
=
3253 (struct elf_assign_sym_version_info
*) data
;
3254 struct bfd_link_info
*info
= sinfo
->info
;
3255 struct elf_info_failed eif
;
3258 /* Fix the symbol flags. */
3261 if (! elf_fix_symbol_flags (h
, &eif
))
3264 sinfo
->failed
= true;
3268 /* We only need version numbers for symbols defined in regular
3270 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3273 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3274 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3276 struct bfd_elf_version_tree
*t
;
3281 /* There are two consecutive ELF_VER_CHR characters if this is
3282 not a hidden symbol. */
3284 if (*p
== ELF_VER_CHR
)
3290 /* If there is no version string, we can just return out. */
3294 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3298 /* Look for the version. If we find it, it is no longer weak. */
3299 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3301 if (strcmp (t
->name
, p
) == 0)
3305 struct bfd_elf_version_expr
*d
;
3307 len
= p
- h
->root
.root
.string
;
3308 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3311 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3312 alc
[len
- 1] = '\0';
3313 if (alc
[len
- 2] == ELF_VER_CHR
)
3314 alc
[len
- 2] = '\0';
3316 h
->verinfo
.vertree
= t
;
3320 if (t
->globals
!= NULL
)
3322 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3324 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3325 || fnmatch (d
->match
, alc
, 0) == 0)
3330 /* See if there is anything to force this symbol to
3332 if (d
== NULL
&& t
->locals
!= NULL
)
3334 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3336 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3337 || fnmatch (d
->match
, alc
, 0) == 0)
3339 if (h
->dynindx
!= -1
3341 && ! sinfo
->export_dynamic
)
3343 sinfo
->removed_dynamic
= true;
3344 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3345 h
->elf_link_hash_flags
&=~
3346 ELF_LINK_HASH_NEEDS_PLT
;
3348 h
->plt
.offset
= (bfd_vma
) -1;
3349 /* FIXME: The name of the symbol has
3350 already been recorded in the dynamic
3351 string table section. */
3359 bfd_release (sinfo
->output_bfd
, alc
);
3364 /* If we are building an application, we need to create a
3365 version node for this version. */
3366 if (t
== NULL
&& ! info
->shared
)
3368 struct bfd_elf_version_tree
**pp
;
3371 /* If we aren't going to export this symbol, we don't need
3372 to worry about it. */
3373 if (h
->dynindx
== -1)
3376 t
= ((struct bfd_elf_version_tree
*)
3377 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3380 sinfo
->failed
= true;
3389 t
->name_indx
= (unsigned int) -1;
3393 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3395 t
->vernum
= version_index
;
3399 h
->verinfo
.vertree
= t
;
3403 /* We could not find the version for a symbol when
3404 generating a shared archive. Return an error. */
3405 (*_bfd_error_handler
)
3406 (_("%s: undefined versioned symbol name %s"),
3407 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3408 bfd_set_error (bfd_error_bad_value
);
3409 sinfo
->failed
= true;
3414 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3417 /* If we don't have a version for this symbol, see if we can find
3419 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3421 struct bfd_elf_version_tree
*t
;
3422 struct bfd_elf_version_tree
*deflt
;
3423 struct bfd_elf_version_expr
*d
;
3425 /* See if can find what version this symbol is in. If the
3426 symbol is supposed to be local, then don't actually register
3429 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3431 if (t
->globals
!= NULL
)
3433 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3435 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3437 h
->verinfo
.vertree
= t
;
3446 if (t
->locals
!= NULL
)
3448 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3450 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3452 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3454 h
->verinfo
.vertree
= t
;
3455 if (h
->dynindx
!= -1
3457 && ! sinfo
->export_dynamic
)
3459 sinfo
->removed_dynamic
= true;
3460 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3461 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3463 h
->plt
.offset
= (bfd_vma
) -1;
3464 /* FIXME: The name of the symbol has already
3465 been recorded in the dynamic string table
3477 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3479 h
->verinfo
.vertree
= deflt
;
3480 if (h
->dynindx
!= -1
3482 && ! sinfo
->export_dynamic
)
3484 sinfo
->removed_dynamic
= true;
3485 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3486 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3488 h
->plt
.offset
= (bfd_vma
) -1;
3489 /* FIXME: The name of the symbol has already been
3490 recorded in the dynamic string table section. */
3498 /* This function is used to renumber the dynamic symbols, if some of
3499 them are removed because they are marked as local. This is called
3500 via elf_link_hash_traverse. */
3503 elf_link_renumber_dynsyms (h
, data
)
3504 struct elf_link_hash_entry
*h
;
3507 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3509 if (h
->dynindx
!= -1)
3511 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3512 ++elf_hash_table (info
)->dynsymcount
;
3518 /* Final phase of ELF linker. */
3520 /* A structure we use to avoid passing large numbers of arguments. */
3522 struct elf_final_link_info
3524 /* General link information. */
3525 struct bfd_link_info
*info
;
3528 /* Symbol string table. */
3529 struct bfd_strtab_hash
*symstrtab
;
3530 /* .dynsym section. */
3531 asection
*dynsym_sec
;
3532 /* .hash section. */
3534 /* symbol version section (.gnu.version). */
3535 asection
*symver_sec
;
3536 /* Buffer large enough to hold contents of any section. */
3538 /* Buffer large enough to hold external relocs of any section. */
3539 PTR external_relocs
;
3540 /* Buffer large enough to hold internal relocs of any section. */
3541 Elf_Internal_Rela
*internal_relocs
;
3542 /* Buffer large enough to hold external local symbols of any input
3544 Elf_External_Sym
*external_syms
;
3545 /* Buffer large enough to hold internal local symbols of any input
3547 Elf_Internal_Sym
*internal_syms
;
3548 /* Array large enough to hold a symbol index for each local symbol
3549 of any input BFD. */
3551 /* Array large enough to hold a section pointer for each local
3552 symbol of any input BFD. */
3553 asection
**sections
;
3554 /* Buffer to hold swapped out symbols. */
3555 Elf_External_Sym
*symbuf
;
3556 /* Number of swapped out symbols in buffer. */
3557 size_t symbuf_count
;
3558 /* Number of symbols which fit in symbuf. */
3562 static boolean elf_link_output_sym
3563 PARAMS ((struct elf_final_link_info
*, const char *,
3564 Elf_Internal_Sym
*, asection
*));
3565 static boolean elf_link_flush_output_syms
3566 PARAMS ((struct elf_final_link_info
*));
3567 static boolean elf_link_output_extsym
3568 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3569 static boolean elf_link_input_bfd
3570 PARAMS ((struct elf_final_link_info
*, bfd
*));
3571 static boolean elf_reloc_link_order
3572 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3573 struct bfd_link_order
*));
3575 /* This struct is used to pass information to elf_link_output_extsym. */
3577 struct elf_outext_info
3581 struct elf_final_link_info
*finfo
;
3584 /* Do the final step of an ELF link. */
3587 elf_bfd_final_link (abfd
, info
)
3589 struct bfd_link_info
*info
;
3593 struct elf_final_link_info finfo
;
3594 register asection
*o
;
3595 register struct bfd_link_order
*p
;
3597 size_t max_contents_size
;
3598 size_t max_external_reloc_size
;
3599 size_t max_internal_reloc_count
;
3600 size_t max_sym_count
;
3602 Elf_Internal_Sym elfsym
;
3604 Elf_Internal_Shdr
*symtab_hdr
;
3605 Elf_Internal_Shdr
*symstrtab_hdr
;
3606 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3607 struct elf_outext_info eoinfo
;
3610 abfd
->flags
|= DYNAMIC
;
3612 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3613 dynobj
= elf_hash_table (info
)->dynobj
;
3616 finfo
.output_bfd
= abfd
;
3617 finfo
.symstrtab
= elf_stringtab_init ();
3618 if (finfo
.symstrtab
== NULL
)
3623 finfo
.dynsym_sec
= NULL
;
3624 finfo
.hash_sec
= NULL
;
3625 finfo
.symver_sec
= NULL
;
3629 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3630 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3631 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3632 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3633 /* Note that it is OK if symver_sec is NULL. */
3636 finfo
.contents
= NULL
;
3637 finfo
.external_relocs
= NULL
;
3638 finfo
.internal_relocs
= NULL
;
3639 finfo
.external_syms
= NULL
;
3640 finfo
.internal_syms
= NULL
;
3641 finfo
.indices
= NULL
;
3642 finfo
.sections
= NULL
;
3643 finfo
.symbuf
= NULL
;
3644 finfo
.symbuf_count
= 0;
3646 /* Count up the number of relocations we will output for each output
3647 section, so that we know the sizes of the reloc sections. We
3648 also figure out some maximum sizes. */
3649 max_contents_size
= 0;
3650 max_external_reloc_size
= 0;
3651 max_internal_reloc_count
= 0;
3653 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3657 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3659 if (p
->type
== bfd_section_reloc_link_order
3660 || p
->type
== bfd_symbol_reloc_link_order
)
3662 else if (p
->type
== bfd_indirect_link_order
)
3666 sec
= p
->u
.indirect
.section
;
3668 /* Mark all sections which are to be included in the
3669 link. This will normally be every section. We need
3670 to do this so that we can identify any sections which
3671 the linker has decided to not include. */
3672 sec
->linker_mark
= true;
3674 if (info
->relocateable
)
3675 o
->reloc_count
+= sec
->reloc_count
;
3677 if (sec
->_raw_size
> max_contents_size
)
3678 max_contents_size
= sec
->_raw_size
;
3679 if (sec
->_cooked_size
> max_contents_size
)
3680 max_contents_size
= sec
->_cooked_size
;
3682 /* We are interested in just local symbols, not all
3684 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3685 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3689 if (elf_bad_symtab (sec
->owner
))
3690 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3691 / sizeof (Elf_External_Sym
));
3693 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3695 if (sym_count
> max_sym_count
)
3696 max_sym_count
= sym_count
;
3698 if ((sec
->flags
& SEC_RELOC
) != 0)
3702 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3703 if (ext_size
> max_external_reloc_size
)
3704 max_external_reloc_size
= ext_size
;
3705 if (sec
->reloc_count
> max_internal_reloc_count
)
3706 max_internal_reloc_count
= sec
->reloc_count
;
3712 if (o
->reloc_count
> 0)
3713 o
->flags
|= SEC_RELOC
;
3716 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3717 set it (this is probably a bug) and if it is set
3718 assign_section_numbers will create a reloc section. */
3719 o
->flags
&=~ SEC_RELOC
;
3722 /* If the SEC_ALLOC flag is not set, force the section VMA to
3723 zero. This is done in elf_fake_sections as well, but forcing
3724 the VMA to 0 here will ensure that relocs against these
3725 sections are handled correctly. */
3726 if ((o
->flags
& SEC_ALLOC
) == 0
3727 && ! o
->user_set_vma
)
3731 /* Figure out the file positions for everything but the symbol table
3732 and the relocs. We set symcount to force assign_section_numbers
3733 to create a symbol table. */
3734 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3735 BFD_ASSERT (! abfd
->output_has_begun
);
3736 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3739 /* That created the reloc sections. Set their sizes, and assign
3740 them file positions, and allocate some buffers. */
3741 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3743 if ((o
->flags
& SEC_RELOC
) != 0)
3745 Elf_Internal_Shdr
*rel_hdr
;
3746 register struct elf_link_hash_entry
**p
, **pend
;
3748 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3750 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3752 /* The contents field must last into write_object_contents,
3753 so we allocate it with bfd_alloc rather than malloc. */
3754 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3755 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3758 p
= ((struct elf_link_hash_entry
**)
3759 bfd_malloc (o
->reloc_count
3760 * sizeof (struct elf_link_hash_entry
*)));
3761 if (p
== NULL
&& o
->reloc_count
!= 0)
3763 elf_section_data (o
)->rel_hashes
= p
;
3764 pend
= p
+ o
->reloc_count
;
3765 for (; p
< pend
; p
++)
3768 /* Use the reloc_count field as an index when outputting the
3774 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3776 /* We have now assigned file positions for all the sections except
3777 .symtab and .strtab. We start the .symtab section at the current
3778 file position, and write directly to it. We build the .strtab
3779 section in memory. */
3781 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3782 /* sh_name is set in prep_headers. */
3783 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3784 symtab_hdr
->sh_flags
= 0;
3785 symtab_hdr
->sh_addr
= 0;
3786 symtab_hdr
->sh_size
= 0;
3787 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3788 /* sh_link is set in assign_section_numbers. */
3789 /* sh_info is set below. */
3790 /* sh_offset is set just below. */
3791 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3793 off
= elf_tdata (abfd
)->next_file_pos
;
3794 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3796 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3797 incorrect. We do not yet know the size of the .symtab section.
3798 We correct next_file_pos below, after we do know the size. */
3800 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3801 continuously seeking to the right position in the file. */
3802 if (! info
->keep_memory
|| max_sym_count
< 20)
3803 finfo
.symbuf_size
= 20;
3805 finfo
.symbuf_size
= max_sym_count
;
3806 finfo
.symbuf
= ((Elf_External_Sym
*)
3807 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3808 if (finfo
.symbuf
== NULL
)
3811 /* Start writing out the symbol table. The first symbol is always a
3813 if (info
->strip
!= strip_all
|| info
->relocateable
)
3815 elfsym
.st_value
= 0;
3818 elfsym
.st_other
= 0;
3819 elfsym
.st_shndx
= SHN_UNDEF
;
3820 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3821 &elfsym
, bfd_und_section_ptr
))
3826 /* Some standard ELF linkers do this, but we don't because it causes
3827 bootstrap comparison failures. */
3828 /* Output a file symbol for the output file as the second symbol.
3829 We output this even if we are discarding local symbols, although
3830 I'm not sure if this is correct. */
3831 elfsym
.st_value
= 0;
3833 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3834 elfsym
.st_other
= 0;
3835 elfsym
.st_shndx
= SHN_ABS
;
3836 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3837 &elfsym
, bfd_abs_section_ptr
))
3841 /* Output a symbol for each section. We output these even if we are
3842 discarding local symbols, since they are used for relocs. These
3843 symbols have no names. We store the index of each one in the
3844 index field of the section, so that we can find it again when
3845 outputting relocs. */
3846 if (info
->strip
!= strip_all
|| info
->relocateable
)
3849 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3850 elfsym
.st_other
= 0;
3851 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3853 o
= section_from_elf_index (abfd
, i
);
3855 o
->target_index
= abfd
->symcount
;
3856 elfsym
.st_shndx
= i
;
3857 if (info
->relocateable
|| o
== NULL
)
3858 elfsym
.st_value
= 0;
3860 elfsym
.st_value
= o
->vma
;
3861 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3867 /* Allocate some memory to hold information read in from the input
3869 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3870 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3871 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3872 bfd_malloc (max_internal_reloc_count
3873 * sizeof (Elf_Internal_Rela
)));
3874 finfo
.external_syms
= ((Elf_External_Sym
*)
3875 bfd_malloc (max_sym_count
3876 * sizeof (Elf_External_Sym
)));
3877 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3878 bfd_malloc (max_sym_count
3879 * sizeof (Elf_Internal_Sym
)));
3880 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3881 finfo
.sections
= ((asection
**)
3882 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3883 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3884 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3885 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3886 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3887 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3888 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3889 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3892 /* Since ELF permits relocations to be against local symbols, we
3893 must have the local symbols available when we do the relocations.
3894 Since we would rather only read the local symbols once, and we
3895 would rather not keep them in memory, we handle all the
3896 relocations for a single input file at the same time.
3898 Unfortunately, there is no way to know the total number of local
3899 symbols until we have seen all of them, and the local symbol
3900 indices precede the global symbol indices. This means that when
3901 we are generating relocateable output, and we see a reloc against
3902 a global symbol, we can not know the symbol index until we have
3903 finished examining all the local symbols to see which ones we are
3904 going to output. To deal with this, we keep the relocations in
3905 memory, and don't output them until the end of the link. This is
3906 an unfortunate waste of memory, but I don't see a good way around
3907 it. Fortunately, it only happens when performing a relocateable
3908 link, which is not the common case. FIXME: If keep_memory is set
3909 we could write the relocs out and then read them again; I don't
3910 know how bad the memory loss will be. */
3912 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3913 sub
->output_has_begun
= false;
3914 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3916 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3918 if (p
->type
== bfd_indirect_link_order
3919 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3920 == bfd_target_elf_flavour
))
3922 sub
= p
->u
.indirect
.section
->owner
;
3923 if (! sub
->output_has_begun
)
3925 if (! elf_link_input_bfd (&finfo
, sub
))
3927 sub
->output_has_begun
= true;
3930 else if (p
->type
== bfd_section_reloc_link_order
3931 || p
->type
== bfd_symbol_reloc_link_order
)
3933 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3938 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3944 /* That wrote out all the local symbols. Finish up the symbol table
3945 with the global symbols. */
3947 if (info
->strip
!= strip_all
&& info
->shared
)
3949 /* Output any global symbols that got converted to local in a
3950 version script. We do this in a separate step since ELF
3951 requires all local symbols to appear prior to any global
3952 symbols. FIXME: We should only do this if some global
3953 symbols were, in fact, converted to become local. FIXME:
3954 Will this work correctly with the Irix 5 linker? */
3955 eoinfo
.failed
= false;
3956 eoinfo
.finfo
= &finfo
;
3957 eoinfo
.localsyms
= true;
3958 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3964 /* The sh_info field records the index of the first non local
3966 symtab_hdr
->sh_info
= abfd
->symcount
;
3968 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3970 /* We get the global symbols from the hash table. */
3971 eoinfo
.failed
= false;
3972 eoinfo
.localsyms
= false;
3973 eoinfo
.finfo
= &finfo
;
3974 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3979 /* Flush all symbols to the file. */
3980 if (! elf_link_flush_output_syms (&finfo
))
3983 /* Now we know the size of the symtab section. */
3984 off
+= symtab_hdr
->sh_size
;
3986 /* Finish up and write out the symbol string table (.strtab)
3988 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3989 /* sh_name was set in prep_headers. */
3990 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3991 symstrtab_hdr
->sh_flags
= 0;
3992 symstrtab_hdr
->sh_addr
= 0;
3993 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3994 symstrtab_hdr
->sh_entsize
= 0;
3995 symstrtab_hdr
->sh_link
= 0;
3996 symstrtab_hdr
->sh_info
= 0;
3997 /* sh_offset is set just below. */
3998 symstrtab_hdr
->sh_addralign
= 1;
4000 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4001 elf_tdata (abfd
)->next_file_pos
= off
;
4003 if (abfd
->symcount
> 0)
4005 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4006 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4010 /* Adjust the relocs to have the correct symbol indices. */
4011 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4013 struct elf_link_hash_entry
**rel_hash
;
4014 Elf_Internal_Shdr
*rel_hdr
;
4016 if ((o
->flags
& SEC_RELOC
) == 0)
4019 rel_hash
= elf_section_data (o
)->rel_hashes
;
4020 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4021 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
4023 if (*rel_hash
== NULL
)
4026 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4028 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4030 Elf_External_Rel
*erel
;
4031 Elf_Internal_Rel irel
;
4033 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4034 elf_swap_reloc_in (abfd
, erel
, &irel
);
4035 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4036 ELF_R_TYPE (irel
.r_info
));
4037 elf_swap_reloc_out (abfd
, &irel
, erel
);
4041 Elf_External_Rela
*erela
;
4042 Elf_Internal_Rela irela
;
4044 BFD_ASSERT (rel_hdr
->sh_entsize
4045 == sizeof (Elf_External_Rela
));
4047 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4048 elf_swap_reloca_in (abfd
, erela
, &irela
);
4049 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4050 ELF_R_TYPE (irela
.r_info
));
4051 elf_swap_reloca_out (abfd
, &irela
, erela
);
4055 /* Set the reloc_count field to 0 to prevent write_relocs from
4056 trying to swap the relocs out itself. */
4060 /* If we are linking against a dynamic object, or generating a
4061 shared library, finish up the dynamic linking information. */
4064 Elf_External_Dyn
*dyncon
, *dynconend
;
4066 /* Fix up .dynamic entries. */
4067 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4068 BFD_ASSERT (o
!= NULL
);
4070 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4071 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4072 for (; dyncon
< dynconend
; dyncon
++)
4074 Elf_Internal_Dyn dyn
;
4078 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4085 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
4086 magic _init and _fini symbols. This is pretty ugly,
4087 but we are compatible. */
4095 struct elf_link_hash_entry
*h
;
4097 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4098 false, false, true);
4100 && (h
->root
.type
== bfd_link_hash_defined
4101 || h
->root
.type
== bfd_link_hash_defweak
))
4103 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4104 o
= h
->root
.u
.def
.section
;
4105 if (o
->output_section
!= NULL
)
4106 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4107 + o
->output_offset
);
4110 /* The symbol is imported from another shared
4111 library and does not apply to this one. */
4115 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4130 name
= ".gnu.version_d";
4133 name
= ".gnu.version_r";
4136 name
= ".gnu.version";
4138 o
= bfd_get_section_by_name (abfd
, name
);
4139 BFD_ASSERT (o
!= NULL
);
4140 dyn
.d_un
.d_ptr
= o
->vma
;
4141 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4148 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4153 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4155 Elf_Internal_Shdr
*hdr
;
4157 hdr
= elf_elfsections (abfd
)[i
];
4158 if (hdr
->sh_type
== type
4159 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4161 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4162 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4165 if (dyn
.d_un
.d_val
== 0
4166 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4167 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4171 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4177 /* If we have created any dynamic sections, then output them. */
4180 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4183 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4185 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4186 || o
->_raw_size
== 0)
4188 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4190 /* At this point, we are only interested in sections
4191 created by elf_link_create_dynamic_sections. */
4194 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4196 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4198 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4199 o
->contents
, o
->output_offset
,
4207 /* The contents of the .dynstr section are actually in a
4209 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4210 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4211 || ! _bfd_stringtab_emit (abfd
,
4212 elf_hash_table (info
)->dynstr
))
4218 /* If we have optimized stabs strings, output them. */
4219 if (elf_hash_table (info
)->stab_info
!= NULL
)
4221 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4225 if (finfo
.symstrtab
!= NULL
)
4226 _bfd_stringtab_free (finfo
.symstrtab
);
4227 if (finfo
.contents
!= NULL
)
4228 free (finfo
.contents
);
4229 if (finfo
.external_relocs
!= NULL
)
4230 free (finfo
.external_relocs
);
4231 if (finfo
.internal_relocs
!= NULL
)
4232 free (finfo
.internal_relocs
);
4233 if (finfo
.external_syms
!= NULL
)
4234 free (finfo
.external_syms
);
4235 if (finfo
.internal_syms
!= NULL
)
4236 free (finfo
.internal_syms
);
4237 if (finfo
.indices
!= NULL
)
4238 free (finfo
.indices
);
4239 if (finfo
.sections
!= NULL
)
4240 free (finfo
.sections
);
4241 if (finfo
.symbuf
!= NULL
)
4242 free (finfo
.symbuf
);
4243 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4245 if ((o
->flags
& SEC_RELOC
) != 0
4246 && elf_section_data (o
)->rel_hashes
!= NULL
)
4247 free (elf_section_data (o
)->rel_hashes
);
4250 elf_tdata (abfd
)->linker
= true;
4255 if (finfo
.symstrtab
!= NULL
)
4256 _bfd_stringtab_free (finfo
.symstrtab
);
4257 if (finfo
.contents
!= NULL
)
4258 free (finfo
.contents
);
4259 if (finfo
.external_relocs
!= NULL
)
4260 free (finfo
.external_relocs
);
4261 if (finfo
.internal_relocs
!= NULL
)
4262 free (finfo
.internal_relocs
);
4263 if (finfo
.external_syms
!= NULL
)
4264 free (finfo
.external_syms
);
4265 if (finfo
.internal_syms
!= NULL
)
4266 free (finfo
.internal_syms
);
4267 if (finfo
.indices
!= NULL
)
4268 free (finfo
.indices
);
4269 if (finfo
.sections
!= NULL
)
4270 free (finfo
.sections
);
4271 if (finfo
.symbuf
!= NULL
)
4272 free (finfo
.symbuf
);
4273 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4275 if ((o
->flags
& SEC_RELOC
) != 0
4276 && elf_section_data (o
)->rel_hashes
!= NULL
)
4277 free (elf_section_data (o
)->rel_hashes
);
4283 /* Add a symbol to the output symbol table. */
4286 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4287 struct elf_final_link_info
*finfo
;
4289 Elf_Internal_Sym
*elfsym
;
4290 asection
*input_sec
;
4292 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4293 struct bfd_link_info
*info
,
4298 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4299 elf_backend_link_output_symbol_hook
;
4300 if (output_symbol_hook
!= NULL
)
4302 if (! ((*output_symbol_hook
)
4303 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4307 if (name
== (const char *) NULL
|| *name
== '\0')
4308 elfsym
->st_name
= 0;
4311 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4314 if (elfsym
->st_name
== (unsigned long) -1)
4318 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4320 if (! elf_link_flush_output_syms (finfo
))
4324 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4325 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4326 ++finfo
->symbuf_count
;
4328 ++finfo
->output_bfd
->symcount
;
4333 /* Flush the output symbols to the file. */
4336 elf_link_flush_output_syms (finfo
)
4337 struct elf_final_link_info
*finfo
;
4339 if (finfo
->symbuf_count
> 0)
4341 Elf_Internal_Shdr
*symtab
;
4343 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4345 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4347 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4348 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4349 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4352 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4354 finfo
->symbuf_count
= 0;
4360 /* Add an external symbol to the symbol table. This is called from
4361 the hash table traversal routine. When generating a shared object,
4362 we go through the symbol table twice. The first time we output
4363 anything that might have been forced to local scope in a version
4364 script. The second time we output the symbols that are still
4368 elf_link_output_extsym (h
, data
)
4369 struct elf_link_hash_entry
*h
;
4372 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4373 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4375 Elf_Internal_Sym sym
;
4376 asection
*input_sec
;
4378 /* Decide whether to output this symbol in this pass. */
4379 if (eoinfo
->localsyms
)
4381 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4386 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4390 /* If we are not creating a shared library, and this symbol is
4391 referenced by a shared library but is not defined anywhere, then
4392 warn that it is undefined. If we do not do this, the runtime
4393 linker will complain that the symbol is undefined when the
4394 program is run. We don't have to worry about symbols that are
4395 referenced by regular files, because we will already have issued
4396 warnings for them. */
4397 if (! finfo
->info
->relocateable
4398 && ! finfo
->info
->shared
4399 && h
->root
.type
== bfd_link_hash_undefined
4400 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4401 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4403 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4404 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4405 (asection
*) NULL
, 0)))
4407 eoinfo
->failed
= true;
4412 /* We don't want to output symbols that have never been mentioned by
4413 a regular file, or that we have been told to strip. However, if
4414 h->indx is set to -2, the symbol is used by a reloc and we must
4418 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4419 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4420 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4421 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4423 else if (finfo
->info
->strip
== strip_all
4424 || (finfo
->info
->strip
== strip_some
4425 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4426 h
->root
.root
.string
,
4427 false, false) == NULL
))
4432 /* If we're stripping it, and it's not a dynamic symbol, there's
4433 nothing else to do. */
4434 if (strip
&& h
->dynindx
== -1)
4438 sym
.st_size
= h
->size
;
4439 sym
.st_other
= h
->other
;
4440 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4441 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4442 else if (h
->root
.type
== bfd_link_hash_undefweak
4443 || h
->root
.type
== bfd_link_hash_defweak
)
4444 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4446 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4448 switch (h
->root
.type
)
4451 case bfd_link_hash_new
:
4455 case bfd_link_hash_undefined
:
4456 input_sec
= bfd_und_section_ptr
;
4457 sym
.st_shndx
= SHN_UNDEF
;
4460 case bfd_link_hash_undefweak
:
4461 input_sec
= bfd_und_section_ptr
;
4462 sym
.st_shndx
= SHN_UNDEF
;
4465 case bfd_link_hash_defined
:
4466 case bfd_link_hash_defweak
:
4468 input_sec
= h
->root
.u
.def
.section
;
4469 if (input_sec
->output_section
!= NULL
)
4472 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4473 input_sec
->output_section
);
4474 if (sym
.st_shndx
== (unsigned short) -1)
4476 (*_bfd_error_handler
)
4477 (_("%s: could not find output section %s for input section %s"),
4478 bfd_get_filename (finfo
->output_bfd
),
4479 input_sec
->output_section
->name
,
4481 eoinfo
->failed
= true;
4485 /* ELF symbols in relocateable files are section relative,
4486 but in nonrelocateable files they are virtual
4488 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4489 if (! finfo
->info
->relocateable
)
4490 sym
.st_value
+= input_sec
->output_section
->vma
;
4494 BFD_ASSERT (input_sec
->owner
== NULL
4495 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4496 sym
.st_shndx
= SHN_UNDEF
;
4497 input_sec
= bfd_und_section_ptr
;
4502 case bfd_link_hash_common
:
4503 input_sec
= h
->root
.u
.c
.p
->section
;
4504 sym
.st_shndx
= SHN_COMMON
;
4505 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4508 case bfd_link_hash_indirect
:
4509 /* These symbols are created by symbol versioning. They point
4510 to the decorated version of the name. For example, if the
4511 symbol foo@@GNU_1.2 is the default, which should be used when
4512 foo is used with no version, then we add an indirect symbol
4513 foo which points to foo@@GNU_1.2. We ignore these symbols,
4514 since the indirected symbol is already in the hash table. If
4515 the indirect symbol is non-ELF, fall through and output it. */
4516 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4520 case bfd_link_hash_warning
:
4521 /* We can't represent these symbols in ELF, although a warning
4522 symbol may have come from a .gnu.warning.SYMBOL section. We
4523 just put the target symbol in the hash table. If the target
4524 symbol does not really exist, don't do anything. */
4525 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4527 return (elf_link_output_extsym
4528 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4531 /* Give the processor backend a chance to tweak the symbol value,
4532 and also to finish up anything that needs to be done for this
4534 if ((h
->dynindx
!= -1
4535 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4536 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4538 struct elf_backend_data
*bed
;
4540 bed
= get_elf_backend_data (finfo
->output_bfd
);
4541 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4542 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4544 eoinfo
->failed
= true;
4549 /* If this symbol should be put in the .dynsym section, then put it
4550 there now. We have already know the symbol index. We also fill
4551 in the entry in the .hash section. */
4552 if (h
->dynindx
!= -1
4553 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4557 bfd_byte
*bucketpos
;
4560 sym
.st_name
= h
->dynstr_index
;
4562 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4563 (PTR
) (((Elf_External_Sym
*)
4564 finfo
->dynsym_sec
->contents
)
4567 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4568 bucket
= h
->elf_hash_value
% bucketcount
;
4569 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4570 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4571 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4572 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4573 put_word (finfo
->output_bfd
, chain
,
4574 ((bfd_byte
*) finfo
->hash_sec
->contents
4575 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4577 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4579 Elf_Internal_Versym iversym
;
4581 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4583 if (h
->verinfo
.verdef
== NULL
)
4584 iversym
.vs_vers
= 0;
4586 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4590 if (h
->verinfo
.vertree
== NULL
)
4591 iversym
.vs_vers
= 1;
4593 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4596 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4597 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4599 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4600 (((Elf_External_Versym
*)
4601 finfo
->symver_sec
->contents
)
4606 /* If we're stripping it, then it was just a dynamic symbol, and
4607 there's nothing else to do. */
4611 h
->indx
= finfo
->output_bfd
->symcount
;
4613 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4615 eoinfo
->failed
= true;
4622 /* Link an input file into the linker output file. This function
4623 handles all the sections and relocations of the input file at once.
4624 This is so that we only have to read the local symbols once, and
4625 don't have to keep them in memory. */
4628 elf_link_input_bfd (finfo
, input_bfd
)
4629 struct elf_final_link_info
*finfo
;
4632 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4633 bfd
*, asection
*, bfd_byte
*,
4634 Elf_Internal_Rela
*,
4635 Elf_Internal_Sym
*, asection
**));
4637 Elf_Internal_Shdr
*symtab_hdr
;
4640 Elf_External_Sym
*external_syms
;
4641 Elf_External_Sym
*esym
;
4642 Elf_External_Sym
*esymend
;
4643 Elf_Internal_Sym
*isym
;
4645 asection
**ppsection
;
4648 output_bfd
= finfo
->output_bfd
;
4650 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4652 /* If this is a dynamic object, we don't want to do anything here:
4653 we don't want the local symbols, and we don't want the section
4655 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4658 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4659 if (elf_bad_symtab (input_bfd
))
4661 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4666 locsymcount
= symtab_hdr
->sh_info
;
4667 extsymoff
= symtab_hdr
->sh_info
;
4670 /* Read the local symbols. */
4671 if (symtab_hdr
->contents
!= NULL
)
4672 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4673 else if (locsymcount
== 0)
4674 external_syms
= NULL
;
4677 external_syms
= finfo
->external_syms
;
4678 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4679 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4680 locsymcount
, input_bfd
)
4681 != locsymcount
* sizeof (Elf_External_Sym
)))
4685 /* Swap in the local symbols and write out the ones which we know
4686 are going into the output file. */
4687 esym
= external_syms
;
4688 esymend
= esym
+ locsymcount
;
4689 isym
= finfo
->internal_syms
;
4690 pindex
= finfo
->indices
;
4691 ppsection
= finfo
->sections
;
4692 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4696 Elf_Internal_Sym osym
;
4698 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4701 if (elf_bad_symtab (input_bfd
))
4703 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4710 if (isym
->st_shndx
== SHN_UNDEF
)
4711 isec
= bfd_und_section_ptr
;
4712 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4713 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4714 else if (isym
->st_shndx
== SHN_ABS
)
4715 isec
= bfd_abs_section_ptr
;
4716 else if (isym
->st_shndx
== SHN_COMMON
)
4717 isec
= bfd_com_section_ptr
;
4726 /* Don't output the first, undefined, symbol. */
4727 if (esym
== external_syms
)
4730 /* If we are stripping all symbols, we don't want to output this
4732 if (finfo
->info
->strip
== strip_all
)
4735 /* We never output section symbols. Instead, we use the section
4736 symbol of the corresponding section in the output file. */
4737 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4740 /* If we are discarding all local symbols, we don't want to
4741 output this one. If we are generating a relocateable output
4742 file, then some of the local symbols may be required by
4743 relocs; we output them below as we discover that they are
4745 if (finfo
->info
->discard
== discard_all
)
4748 /* If this symbol is defined in a section which we are
4749 discarding, we don't need to keep it, but note that
4750 linker_mark is only reliable for sections that have contents.
4751 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4752 as well as linker_mark. */
4753 if (isym
->st_shndx
> 0
4754 && isym
->st_shndx
< SHN_LORESERVE
4756 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4757 || (! finfo
->info
->relocateable
4758 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4761 /* Get the name of the symbol. */
4762 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4767 /* See if we are discarding symbols with this name. */
4768 if ((finfo
->info
->strip
== strip_some
4769 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4771 || (finfo
->info
->discard
== discard_l
4772 && bfd_is_local_label_name (input_bfd
, name
)))
4775 /* If we get here, we are going to output this symbol. */
4779 /* Adjust the section index for the output file. */
4780 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4781 isec
->output_section
);
4782 if (osym
.st_shndx
== (unsigned short) -1)
4785 *pindex
= output_bfd
->symcount
;
4787 /* ELF symbols in relocateable files are section relative, but
4788 in executable files they are virtual addresses. Note that
4789 this code assumes that all ELF sections have an associated
4790 BFD section with a reasonable value for output_offset; below
4791 we assume that they also have a reasonable value for
4792 output_section. Any special sections must be set up to meet
4793 these requirements. */
4794 osym
.st_value
+= isec
->output_offset
;
4795 if (! finfo
->info
->relocateable
)
4796 osym
.st_value
+= isec
->output_section
->vma
;
4798 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4802 /* Relocate the contents of each section. */
4803 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4807 if (! o
->linker_mark
)
4809 /* This section was omitted from the link. */
4813 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4814 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4817 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4819 /* Section was created by elf_link_create_dynamic_sections
4824 /* Get the contents of the section. They have been cached by a
4825 relaxation routine. Note that o is a section in an input
4826 file, so the contents field will not have been set by any of
4827 the routines which work on output files. */
4828 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4829 contents
= elf_section_data (o
)->this_hdr
.contents
;
4832 contents
= finfo
->contents
;
4833 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4834 (file_ptr
) 0, o
->_raw_size
))
4838 if ((o
->flags
& SEC_RELOC
) != 0)
4840 Elf_Internal_Rela
*internal_relocs
;
4842 /* Get the swapped relocs. */
4843 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4844 (input_bfd
, o
, finfo
->external_relocs
,
4845 finfo
->internal_relocs
, false));
4846 if (internal_relocs
== NULL
4847 && o
->reloc_count
> 0)
4850 /* Relocate the section by invoking a back end routine.
4852 The back end routine is responsible for adjusting the
4853 section contents as necessary, and (if using Rela relocs
4854 and generating a relocateable output file) adjusting the
4855 reloc addend as necessary.
4857 The back end routine does not have to worry about setting
4858 the reloc address or the reloc symbol index.
4860 The back end routine is given a pointer to the swapped in
4861 internal symbols, and can access the hash table entries
4862 for the external symbols via elf_sym_hashes (input_bfd).
4864 When generating relocateable output, the back end routine
4865 must handle STB_LOCAL/STT_SECTION symbols specially. The
4866 output symbol is going to be a section symbol
4867 corresponding to the output section, which will require
4868 the addend to be adjusted. */
4870 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4871 input_bfd
, o
, contents
,
4873 finfo
->internal_syms
,
4877 if (finfo
->info
->relocateable
)
4879 Elf_Internal_Rela
*irela
;
4880 Elf_Internal_Rela
*irelaend
;
4881 struct elf_link_hash_entry
**rel_hash
;
4882 Elf_Internal_Shdr
*input_rel_hdr
;
4883 Elf_Internal_Shdr
*output_rel_hdr
;
4885 /* Adjust the reloc addresses and symbol indices. */
4887 irela
= internal_relocs
;
4888 irelaend
= irela
+ o
->reloc_count
;
4889 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4890 + o
->output_section
->reloc_count
);
4891 for (; irela
< irelaend
; irela
++, rel_hash
++)
4893 unsigned long r_symndx
;
4894 Elf_Internal_Sym
*isym
;
4897 irela
->r_offset
+= o
->output_offset
;
4899 r_symndx
= ELF_R_SYM (irela
->r_info
);
4904 if (r_symndx
>= locsymcount
4905 || (elf_bad_symtab (input_bfd
)
4906 && finfo
->sections
[r_symndx
] == NULL
))
4908 struct elf_link_hash_entry
*rh
;
4911 /* This is a reloc against a global symbol. We
4912 have not yet output all the local symbols, so
4913 we do not know the symbol index of any global
4914 symbol. We set the rel_hash entry for this
4915 reloc to point to the global hash table entry
4916 for this symbol. The symbol index is then
4917 set at the end of elf_bfd_final_link. */
4918 indx
= r_symndx
- extsymoff
;
4919 rh
= elf_sym_hashes (input_bfd
)[indx
];
4920 while (rh
->root
.type
== bfd_link_hash_indirect
4921 || rh
->root
.type
== bfd_link_hash_warning
)
4922 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
4924 /* Setting the index to -2 tells
4925 elf_link_output_extsym that this symbol is
4927 BFD_ASSERT (rh
->indx
< 0);
4935 /* This is a reloc against a local symbol. */
4938 isym
= finfo
->internal_syms
+ r_symndx
;
4939 sec
= finfo
->sections
[r_symndx
];
4940 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4942 /* I suppose the backend ought to fill in the
4943 section of any STT_SECTION symbol against a
4944 processor specific section. If we have
4945 discarded a section, the output_section will
4946 be the absolute section. */
4948 && (bfd_is_abs_section (sec
)
4949 || (sec
->output_section
!= NULL
4950 && bfd_is_abs_section (sec
->output_section
))))
4952 else if (sec
== NULL
|| sec
->owner
== NULL
)
4954 bfd_set_error (bfd_error_bad_value
);
4959 r_symndx
= sec
->output_section
->target_index
;
4960 BFD_ASSERT (r_symndx
!= 0);
4965 if (finfo
->indices
[r_symndx
] == -1)
4971 if (finfo
->info
->strip
== strip_all
)
4973 /* You can't do ld -r -s. */
4974 bfd_set_error (bfd_error_invalid_operation
);
4978 /* This symbol was skipped earlier, but
4979 since it is needed by a reloc, we
4980 must output it now. */
4981 link
= symtab_hdr
->sh_link
;
4982 name
= bfd_elf_string_from_elf_section (input_bfd
,
4988 osec
= sec
->output_section
;
4990 _bfd_elf_section_from_bfd_section (output_bfd
,
4992 if (isym
->st_shndx
== (unsigned short) -1)
4995 isym
->st_value
+= sec
->output_offset
;
4996 if (! finfo
->info
->relocateable
)
4997 isym
->st_value
+= osec
->vma
;
4999 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
5001 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5005 r_symndx
= finfo
->indices
[r_symndx
];
5008 irela
->r_info
= ELF_R_INFO (r_symndx
,
5009 ELF_R_TYPE (irela
->r_info
));
5012 /* Swap out the relocs. */
5013 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5014 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
5015 BFD_ASSERT (output_rel_hdr
->sh_entsize
5016 == input_rel_hdr
->sh_entsize
);
5017 irela
= internal_relocs
;
5018 irelaend
= irela
+ o
->reloc_count
;
5019 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5021 Elf_External_Rel
*erel
;
5023 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
5024 + o
->output_section
->reloc_count
);
5025 for (; irela
< irelaend
; irela
++, erel
++)
5027 Elf_Internal_Rel irel
;
5029 irel
.r_offset
= irela
->r_offset
;
5030 irel
.r_info
= irela
->r_info
;
5031 BFD_ASSERT (irela
->r_addend
== 0);
5032 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5037 Elf_External_Rela
*erela
;
5039 BFD_ASSERT (input_rel_hdr
->sh_entsize
5040 == sizeof (Elf_External_Rela
));
5041 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
5042 + o
->output_section
->reloc_count
);
5043 for (; irela
< irelaend
; irela
++, erela
++)
5044 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5047 o
->output_section
->reloc_count
+= o
->reloc_count
;
5051 /* Write out the modified section contents. */
5052 if (elf_section_data (o
)->stab_info
== NULL
)
5054 if (! (o
->flags
& SEC_EXCLUDE
) &&
5055 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5056 contents
, o
->output_offset
,
5057 (o
->_cooked_size
!= 0
5064 if (! (_bfd_write_section_stabs
5065 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5066 o
, &elf_section_data (o
)->stab_info
, contents
)))
5074 /* Generate a reloc when linking an ELF file. This is a reloc
5075 requested by the linker, and does come from any input file. This
5076 is used to build constructor and destructor tables when linking
5080 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5082 struct bfd_link_info
*info
;
5083 asection
*output_section
;
5084 struct bfd_link_order
*link_order
;
5086 reloc_howto_type
*howto
;
5090 struct elf_link_hash_entry
**rel_hash_ptr
;
5091 Elf_Internal_Shdr
*rel_hdr
;
5093 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5096 bfd_set_error (bfd_error_bad_value
);
5100 addend
= link_order
->u
.reloc
.p
->addend
;
5102 /* Figure out the symbol index. */
5103 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5104 + output_section
->reloc_count
);
5105 if (link_order
->type
== bfd_section_reloc_link_order
)
5107 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5108 BFD_ASSERT (indx
!= 0);
5109 *rel_hash_ptr
= NULL
;
5113 struct elf_link_hash_entry
*h
;
5115 /* Treat a reloc against a defined symbol as though it were
5116 actually against the section. */
5117 h
= ((struct elf_link_hash_entry
*)
5118 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5119 link_order
->u
.reloc
.p
->u
.name
,
5120 false, false, true));
5122 && (h
->root
.type
== bfd_link_hash_defined
5123 || h
->root
.type
== bfd_link_hash_defweak
))
5127 section
= h
->root
.u
.def
.section
;
5128 indx
= section
->output_section
->target_index
;
5129 *rel_hash_ptr
= NULL
;
5130 /* It seems that we ought to add the symbol value to the
5131 addend here, but in practice it has already been added
5132 because it was passed to constructor_callback. */
5133 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5137 /* Setting the index to -2 tells elf_link_output_extsym that
5138 this symbol is used by a reloc. */
5145 if (! ((*info
->callbacks
->unattached_reloc
)
5146 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5147 (asection
*) NULL
, (bfd_vma
) 0)))
5153 /* If this is an inplace reloc, we must write the addend into the
5155 if (howto
->partial_inplace
&& addend
!= 0)
5158 bfd_reloc_status_type rstat
;
5162 size
= bfd_get_reloc_size (howto
);
5163 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5164 if (buf
== (bfd_byte
*) NULL
)
5166 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5172 case bfd_reloc_outofrange
:
5174 case bfd_reloc_overflow
:
5175 if (! ((*info
->callbacks
->reloc_overflow
)
5177 (link_order
->type
== bfd_section_reloc_link_order
5178 ? bfd_section_name (output_bfd
,
5179 link_order
->u
.reloc
.p
->u
.section
)
5180 : link_order
->u
.reloc
.p
->u
.name
),
5181 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5189 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5190 (file_ptr
) link_order
->offset
, size
);
5196 /* The address of a reloc is relative to the section in a
5197 relocateable file, and is a virtual address in an executable
5199 offset
= link_order
->offset
;
5200 if (! info
->relocateable
)
5201 offset
+= output_section
->vma
;
5203 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5205 if (rel_hdr
->sh_type
== SHT_REL
)
5207 Elf_Internal_Rel irel
;
5208 Elf_External_Rel
*erel
;
5210 irel
.r_offset
= offset
;
5211 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5212 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5213 + output_section
->reloc_count
);
5214 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5218 Elf_Internal_Rela irela
;
5219 Elf_External_Rela
*erela
;
5221 irela
.r_offset
= offset
;
5222 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5223 irela
.r_addend
= addend
;
5224 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5225 + output_section
->reloc_count
);
5226 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5229 ++output_section
->reloc_count
;
5235 /* Allocate a pointer to live in a linker created section. */
5238 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5240 struct bfd_link_info
*info
;
5241 elf_linker_section_t
*lsect
;
5242 struct elf_link_hash_entry
*h
;
5243 const Elf_Internal_Rela
*rel
;
5245 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5246 elf_linker_section_pointers_t
*linker_section_ptr
;
5247 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5249 BFD_ASSERT (lsect
!= NULL
);
5251 /* Is this a global symbol? */
5254 /* Has this symbol already been allocated, if so, our work is done */
5255 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5260 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5261 /* Make sure this symbol is output as a dynamic symbol. */
5262 if (h
->dynindx
== -1)
5264 if (! elf_link_record_dynamic_symbol (info
, h
))
5268 if (lsect
->rel_section
)
5269 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5272 else /* Allocation of a pointer to a local symbol */
5274 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5276 /* Allocate a table to hold the local symbols if first time */
5279 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5280 register unsigned int i
;
5282 ptr
= (elf_linker_section_pointers_t
**)
5283 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5288 elf_local_ptr_offsets (abfd
) = ptr
;
5289 for (i
= 0; i
< num_symbols
; i
++)
5290 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5293 /* Has this symbol already been allocated, if so, our work is done */
5294 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5299 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5303 /* If we are generating a shared object, we need to
5304 output a R_<xxx>_RELATIVE reloc so that the
5305 dynamic linker can adjust this GOT entry. */
5306 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5307 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5311 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5312 from internal memory. */
5313 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5314 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5315 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5317 if (!linker_section_ptr
)
5320 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5321 linker_section_ptr
->addend
= rel
->r_addend
;
5322 linker_section_ptr
->which
= lsect
->which
;
5323 linker_section_ptr
->written_address_p
= false;
5324 *ptr_linker_section_ptr
= linker_section_ptr
;
5327 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5329 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5330 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5331 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5332 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5334 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5336 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5337 lsect
->sym_hash
->root
.root
.string
,
5338 (long)ARCH_SIZE
/ 8,
5339 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5345 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5347 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5350 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5351 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5359 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5362 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5365 /* Fill in the address for a pointer generated in alinker section. */
5368 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5371 struct bfd_link_info
*info
;
5372 elf_linker_section_t
*lsect
;
5373 struct elf_link_hash_entry
*h
;
5375 const Elf_Internal_Rela
*rel
;
5378 elf_linker_section_pointers_t
*linker_section_ptr
;
5380 BFD_ASSERT (lsect
!= NULL
);
5382 if (h
!= NULL
) /* global symbol */
5384 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5388 BFD_ASSERT (linker_section_ptr
!= NULL
);
5390 if (! elf_hash_table (info
)->dynamic_sections_created
5393 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5395 /* This is actually a static link, or it is a
5396 -Bsymbolic link and the symbol is defined
5397 locally. We must initialize this entry in the
5400 When doing a dynamic link, we create a .rela.<xxx>
5401 relocation entry to initialize the value. This
5402 is done in the finish_dynamic_symbol routine. */
5403 if (!linker_section_ptr
->written_address_p
)
5405 linker_section_ptr
->written_address_p
= true;
5406 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5407 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5411 else /* local symbol */
5413 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5414 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5415 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5416 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5420 BFD_ASSERT (linker_section_ptr
!= NULL
);
5422 /* Write out pointer if it hasn't been rewritten out before */
5423 if (!linker_section_ptr
->written_address_p
)
5425 linker_section_ptr
->written_address_p
= true;
5426 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5427 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5431 asection
*srel
= lsect
->rel_section
;
5432 Elf_Internal_Rela outrel
;
5434 /* We need to generate a relative reloc for the dynamic linker. */
5436 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5439 BFD_ASSERT (srel
!= NULL
);
5441 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5442 + lsect
->section
->output_offset
5443 + linker_section_ptr
->offset
);
5444 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5445 outrel
.r_addend
= 0;
5446 elf_swap_reloca_out (output_bfd
, &outrel
,
5447 (((Elf_External_Rela
*)
5448 lsect
->section
->contents
)
5449 + lsect
->section
->reloc_count
));
5450 ++lsect
->section
->reloc_count
;
5455 relocation
= (lsect
->section
->output_offset
5456 + linker_section_ptr
->offset
5457 - lsect
->hole_offset
5458 - lsect
->sym_offset
);
5461 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5462 lsect
->name
, (long)relocation
, (long)relocation
);
5465 /* Subtract out the addend, because it will get added back in by the normal
5467 return relocation
- linker_section_ptr
->addend
;
5470 /* Garbage collect unused sections. */
5472 static boolean elf_gc_mark
5473 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5474 asection
* (*gc_mark_hook
)
5475 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5476 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5478 static boolean elf_gc_sweep
5479 PARAMS ((struct bfd_link_info
*info
,
5480 boolean (*gc_sweep_hook
)
5481 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5482 const Elf_Internal_Rela
*relocs
))));
5484 static boolean elf_gc_sweep_symbol
5485 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5487 static boolean elf_gc_allocate_got_offsets
5488 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5490 static boolean elf_gc_propagate_vtable_entries_used
5491 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5493 static boolean elf_gc_smash_unused_vtentry_relocs
5494 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5496 /* The mark phase of garbage collection. For a given section, mark
5497 it, and all the sections which define symbols to which it refers. */
5500 elf_gc_mark (info
, sec
, gc_mark_hook
)
5501 struct bfd_link_info
*info
;
5503 asection
* (*gc_mark_hook
)
5504 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5505 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5511 /* Look through the section relocs. */
5513 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5515 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5516 Elf_Internal_Shdr
*symtab_hdr
;
5517 struct elf_link_hash_entry
**sym_hashes
;
5520 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5521 bfd
*input_bfd
= sec
->owner
;
5523 /* GCFIXME: how to arrange so that relocs and symbols are not
5524 reread continually? */
5526 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5527 sym_hashes
= elf_sym_hashes (input_bfd
);
5529 /* Read the local symbols. */
5530 if (elf_bad_symtab (input_bfd
))
5532 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5536 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5537 if (symtab_hdr
->contents
)
5538 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5539 else if (nlocsyms
== 0)
5543 locsyms
= freesyms
=
5544 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5545 if (freesyms
== NULL
5546 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5547 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5548 nlocsyms
, input_bfd
)
5549 != nlocsyms
* sizeof (Elf_External_Sym
)))
5556 /* Read the relocations. */
5557 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5558 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5559 info
->keep_memory
));
5560 if (relstart
== NULL
)
5565 relend
= relstart
+ sec
->reloc_count
;
5567 for (rel
= relstart
; rel
< relend
; rel
++)
5569 unsigned long r_symndx
;
5571 struct elf_link_hash_entry
*h
;
5574 r_symndx
= ELF_R_SYM (rel
->r_info
);
5578 if (elf_bad_symtab (sec
->owner
))
5580 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5581 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5582 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5585 h
= sym_hashes
[r_symndx
- extsymoff
];
5586 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5589 else if (r_symndx
>= nlocsyms
)
5591 h
= sym_hashes
[r_symndx
- extsymoff
];
5592 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5596 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5597 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5600 if (rsec
&& !rsec
->gc_mark
)
5601 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5609 if (!info
->keep_memory
)
5619 /* The sweep phase of garbage collection. Remove all garbage sections. */
5622 elf_gc_sweep (info
, gc_sweep_hook
)
5623 struct bfd_link_info
*info
;
5624 boolean (*gc_sweep_hook
)
5625 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5626 const Elf_Internal_Rela
*relocs
));
5630 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5634 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5636 /* Keep special sections. Keep .debug sections. */
5637 if ((o
->flags
& SEC_LINKER_CREATED
)
5638 || (o
->flags
& SEC_DEBUGGING
))
5644 /* Skip sweeping sections already excluded. */
5645 if (o
->flags
& SEC_EXCLUDE
)
5648 /* Since this is early in the link process, it is simple
5649 to remove a section from the output. */
5650 o
->flags
|= SEC_EXCLUDE
;
5652 /* But we also have to update some of the relocation
5653 info we collected before. */
5655 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5657 Elf_Internal_Rela
*internal_relocs
;
5660 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5661 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5662 if (internal_relocs
== NULL
)
5665 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5667 if (!info
->keep_memory
)
5668 free (internal_relocs
);
5676 /* Remove the symbols that were in the swept sections from the dynamic
5677 symbol table. GCFIXME: Anyone know how to get them out of the
5678 static symbol table as well? */
5682 elf_link_hash_traverse (elf_hash_table (info
),
5683 elf_gc_sweep_symbol
,
5686 elf_hash_table (info
)->dynsymcount
= i
;
5692 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5695 elf_gc_sweep_symbol (h
, idxptr
)
5696 struct elf_link_hash_entry
*h
;
5699 int *idx
= (int *) idxptr
;
5701 if (h
->dynindx
!= -1
5702 && ((h
->root
.type
!= bfd_link_hash_defined
5703 && h
->root
.type
!= bfd_link_hash_defweak
)
5704 || h
->root
.u
.def
.section
->gc_mark
))
5705 h
->dynindx
= (*idx
)++;
5710 /* Propogate collected vtable information. This is called through
5711 elf_link_hash_traverse. */
5714 elf_gc_propagate_vtable_entries_used (h
, okp
)
5715 struct elf_link_hash_entry
*h
;
5718 /* Those that are not vtables. */
5719 if (h
->vtable_parent
== NULL
)
5722 /* Those vtables that do not have parents, we cannot merge. */
5723 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5726 /* If we've already been done, exit. */
5727 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5730 /* Make sure the parent's table is up to date. */
5731 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5733 if (h
->vtable_entries_used
== NULL
)
5735 /* None of this table's entries were referenced. Re-use the
5737 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5738 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
5745 /* Or the parent's entries into ours. */
5746 cu
= h
->vtable_entries_used
;
5748 pu
= h
->vtable_parent
->vtable_entries_used
;
5751 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
5754 if (*pu
) *cu
= true;
5764 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5765 struct elf_link_hash_entry
*h
;
5769 bfd_vma hstart
, hend
;
5770 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5772 /* Take care of both those symbols that do not describe vtables as
5773 well as those that are not loaded. */
5774 if (h
->vtable_parent
== NULL
)
5777 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5778 || h
->root
.type
== bfd_link_hash_defweak
);
5780 sec
= h
->root
.u
.def
.section
;
5781 hstart
= h
->root
.u
.def
.value
;
5782 hend
= hstart
+ h
->size
;
5784 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5785 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5787 return *(boolean
*)okp
= false;
5788 relend
= relstart
+ sec
->reloc_count
;
5790 for (rel
= relstart
; rel
< relend
; ++rel
)
5791 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5793 /* If the entry is in use, do nothing. */
5794 if (h
->vtable_entries_used
5795 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
5797 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5798 if (h
->vtable_entries_used
[entry
])
5801 /* Otherwise, kill it. */
5802 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5808 /* Do mark and sweep of unused sections. */
5811 elf_gc_sections (abfd
, info
)
5813 struct bfd_link_info
*info
;
5817 asection
* (*gc_mark_hook
)
5818 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5819 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5821 if (!get_elf_backend_data (abfd
)->can_gc_sections
5822 || info
->relocateable
5823 || elf_hash_table (info
)->dynamic_sections_created
)
5826 /* Apply transitive closure to the vtable entry usage info. */
5827 elf_link_hash_traverse (elf_hash_table (info
),
5828 elf_gc_propagate_vtable_entries_used
,
5833 /* Kill the vtable relocations that were not used. */
5834 elf_link_hash_traverse (elf_hash_table (info
),
5835 elf_gc_smash_unused_vtentry_relocs
,
5840 /* Grovel through relocs to find out who stays ... */
5842 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5843 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5846 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5848 if (o
->flags
& SEC_KEEP
)
5849 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5854 /* ... and mark SEC_EXCLUDE for those that go. */
5855 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5861 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5864 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5867 struct elf_link_hash_entry
*h
;
5870 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5871 struct elf_link_hash_entry
**search
, *child
;
5872 bfd_size_type extsymcount
;
5874 /* The sh_info field of the symtab header tells us where the
5875 external symbols start. We don't care about the local symbols at
5877 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5878 if (!elf_bad_symtab (abfd
))
5879 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5881 sym_hashes
= elf_sym_hashes (abfd
);
5882 sym_hashes_end
= sym_hashes
+ extsymcount
;
5884 /* Hunt down the child symbol, which is in this section at the same
5885 offset as the relocation. */
5886 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5888 if ((child
= *search
) != NULL
5889 && (child
->root
.type
== bfd_link_hash_defined
5890 || child
->root
.type
== bfd_link_hash_defweak
)
5891 && child
->root
.u
.def
.section
== sec
5892 && child
->root
.u
.def
.value
== offset
)
5896 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5897 bfd_get_filename (abfd
), sec
->name
,
5898 (unsigned long)offset
);
5899 bfd_set_error (bfd_error_invalid_operation
);
5905 /* This *should* only be the absolute section. It could potentially
5906 be that someone has defined a non-global vtable though, which
5907 would be bad. It isn't worth paging in the local symbols to be
5908 sure though; that case should simply be handled by the assembler. */
5910 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
5913 child
->vtable_parent
= h
;
5918 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
5921 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
5924 struct elf_link_hash_entry
*h
;
5927 if (addend
>= h
->vtable_entries_size
)
5930 boolean
*ptr
= h
->vtable_entries_used
;
5932 /* While the symbol is undefined, we have to be prepared to handle
5934 if (h
->root
.type
== bfd_link_hash_undefined
)
5941 /* Oops! We've got a reference past the defined end of
5942 the table. This is probably a bug -- shall we warn? */
5947 /* Allocate one extra entry for use as a "done" flag for the
5948 consolidation pass. */
5949 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
5955 ptr
= realloc (ptr
-1, bytes
);
5959 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
5960 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
5964 ptr
= calloc (1, bytes
);
5969 /* And arrange for that done flag to be at index -1. */
5970 h
->vtable_entries_used
= ptr
+1;
5971 h
->vtable_entries_size
= size
;
5973 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
5978 /* And an accompanying bit to work out final got entry offsets once
5979 we're done. Should be called from final_link. */
5982 elf_gc_common_finalize_got_offsets (abfd
, info
)
5984 struct bfd_link_info
*info
;
5987 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5990 /* The GOT offset is relative to the .got section, but the GOT header is
5991 put into the .got.plt section, if the backend uses it. */
5992 if (bed
->want_got_plt
)
5995 gotoff
= bed
->got_header_size
;
5997 /* Do the local .got entries first. */
5998 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6000 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6001 bfd_size_type j
, locsymcount
;
6002 Elf_Internal_Shdr
*symtab_hdr
;
6007 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6008 if (elf_bad_symtab (i
))
6009 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6011 locsymcount
= symtab_hdr
->sh_info
;
6013 for (j
= 0; j
< locsymcount
; ++j
)
6015 if (local_got
[j
] > 0)
6017 local_got
[j
] = gotoff
;
6018 gotoff
+= ARCH_SIZE
/ 8;
6021 local_got
[j
] = (bfd_vma
) -1;
6025 /* Then the global .got and .plt entries. */
6026 elf_link_hash_traverse (elf_hash_table (info
),
6027 elf_gc_allocate_got_offsets
,
6032 /* We need a special top-level link routine to convert got reference counts
6033 to real got offsets. */
6036 elf_gc_allocate_got_offsets (h
, offarg
)
6037 struct elf_link_hash_entry
*h
;
6040 bfd_vma
*off
= (bfd_vma
*) offarg
;
6042 if (h
->got
.refcount
> 0)
6044 h
->got
.offset
= off
[0];
6045 off
[0] += ARCH_SIZE
/ 8;
6048 h
->got
.offset
= (bfd_vma
) -1;
6053 /* Many folk need no more in the way of final link than this, once
6054 got entry reference counting is enabled. */
6057 elf_gc_common_final_link (abfd
, info
)
6059 struct bfd_link_info
*info
;
6061 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6064 /* Invoke the regular ELF backend linker to do all the work. */
6065 return elf_bfd_final_link (abfd
, info
);
6068 /* This function will be called though elf_link_hash_traverse to store
6069 all hash value of the exported symbols in an array. */
6072 elf_collect_hash_codes (h
, data
)
6073 struct elf_link_hash_entry
*h
;
6076 unsigned long **valuep
= (unsigned long **) data
;
6082 /* Ignore indirect symbols. These are added by the versioning code. */
6083 if (h
->dynindx
== -1)
6086 name
= h
->root
.root
.string
;
6087 p
= strchr (name
, ELF_VER_CHR
);
6090 alc
= bfd_malloc (p
- name
+ 1);
6091 memcpy (alc
, name
, p
- name
);
6092 alc
[p
- name
] = '\0';
6096 /* Compute the hash value. */
6097 ha
= bfd_elf_hash (name
);
6099 /* Store the found hash value in the array given as the argument. */
6102 /* And store it in the struct so that we can put it in the hash table
6104 h
->elf_hash_value
= ha
;