2 Copyright 1995, 1996, 1997 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
));
54 /* Given an ELF BFD, add symbols to the global hash table as
58 elf_bfd_link_add_symbols (abfd
, info
)
60 struct bfd_link_info
*info
;
62 switch (bfd_get_format (abfd
))
65 return elf_link_add_object_symbols (abfd
, info
);
67 return elf_link_add_archive_symbols (abfd
, info
);
69 bfd_set_error (bfd_error_wrong_format
);
75 /* Add symbols from an ELF archive file to the linker hash table. We
76 don't use _bfd_generic_link_add_archive_symbols because of a
77 problem which arises on UnixWare. The UnixWare libc.so is an
78 archive which includes an entry libc.so.1 which defines a bunch of
79 symbols. The libc.so archive also includes a number of other
80 object files, which also define symbols, some of which are the same
81 as those defined in libc.so.1. Correct linking requires that we
82 consider each object file in turn, and include it if it defines any
83 symbols we need. _bfd_generic_link_add_archive_symbols does not do
84 this; it looks through the list of undefined symbols, and includes
85 any object file which defines them. When this algorithm is used on
86 UnixWare, it winds up pulling in libc.so.1 early and defining a
87 bunch of symbols. This means that some of the other objects in the
88 archive are not included in the link, which is incorrect since they
89 precede libc.so.1 in the archive.
91 Fortunately, ELF archive handling is simpler than that done by
92 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
93 oddities. In ELF, if we find a symbol in the archive map, and the
94 symbol is currently undefined, we know that we must pull in that
97 Unfortunately, we do have to make multiple passes over the symbol
98 table until nothing further is resolved. */
101 elf_link_add_archive_symbols (abfd
, info
)
103 struct bfd_link_info
*info
;
106 boolean
*defined
= NULL
;
107 boolean
*included
= NULL
;
111 if (! bfd_has_map (abfd
))
113 /* An empty archive is a special case. */
114 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
116 bfd_set_error (bfd_error_no_armap
);
120 /* Keep track of all symbols we know to be already defined, and all
121 files we know to be already included. This is to speed up the
122 second and subsequent passes. */
123 c
= bfd_ardata (abfd
)->symdef_count
;
126 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
127 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
128 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
130 memset (defined
, 0, c
* sizeof (boolean
));
131 memset (included
, 0, c
* sizeof (boolean
));
133 symdefs
= bfd_ardata (abfd
)->symdefs
;
146 symdefend
= symdef
+ c
;
147 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
149 struct elf_link_hash_entry
*h
;
151 struct bfd_link_hash_entry
*undefs_tail
;
154 if (defined
[i
] || included
[i
])
156 if (symdef
->file_offset
== last
)
162 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
163 false, false, false);
169 /* If this is a default version (the name contains @@),
170 look up the symbol again without the version. The
171 effect is that references to the symbol without the
172 version will be matched by the default symbol in the
175 p
= strchr (symdef
->name
, ELF_VER_CHR
);
176 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
179 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
182 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
183 copy
[p
- symdef
->name
] = '\0';
185 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
186 false, false, false);
188 bfd_release (abfd
, copy
);
194 if (h
->root
.type
!= bfd_link_hash_undefined
)
196 if (h
->root
.type
!= bfd_link_hash_undefweak
)
201 /* We need to include this archive member. */
203 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
204 if (element
== (bfd
*) NULL
)
207 if (! bfd_check_format (element
, bfd_object
))
210 /* Doublecheck that we have not included this object
211 already--it should be impossible, but there may be
212 something wrong with the archive. */
213 if (element
->archive_pass
!= 0)
215 bfd_set_error (bfd_error_bad_value
);
218 element
->archive_pass
= 1;
220 undefs_tail
= info
->hash
->undefs_tail
;
222 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
225 if (! elf_link_add_object_symbols (element
, info
))
228 /* If there are any new undefined symbols, we need to make
229 another pass through the archive in order to see whether
230 they can be defined. FIXME: This isn't perfect, because
231 common symbols wind up on undefs_tail and because an
232 undefined symbol which is defined later on in this pass
233 does not require another pass. This isn't a bug, but it
234 does make the code less efficient than it could be. */
235 if (undefs_tail
!= info
->hash
->undefs_tail
)
238 /* Look backward to mark all symbols from this object file
239 which we have already seen in this pass. */
243 included
[mark
] = true;
248 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
250 /* We mark subsequent symbols from this object file as we go
251 on through the loop. */
252 last
= symdef
->file_offset
;
263 if (defined
!= (boolean
*) NULL
)
265 if (included
!= (boolean
*) NULL
)
270 /* This function is called when we want to define a new symbol. It
271 handles the various cases which arise when we find a definition in
272 a dynamic object, or when there is already a definition in a
273 dynamic object. The new symbol is described by NAME, SYM, PSEC,
274 and PVALUE. We set SYM_HASH to the hash table entry. We set
275 OVERRIDE if the old symbol is overriding a new definition. We set
276 TYPE_CHANGE_OK if it is OK for the type to change. We set
277 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
278 change, we mean that we shouldn't warn if the type or size does
282 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
283 override
, type_change_ok
, size_change_ok
)
285 struct bfd_link_info
*info
;
287 Elf_Internal_Sym
*sym
;
290 struct elf_link_hash_entry
**sym_hash
;
292 boolean
*type_change_ok
;
293 boolean
*size_change_ok
;
296 struct elf_link_hash_entry
*h
;
299 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
301 /* This code is for coping with dynamic objects, and is only useful
302 if we are doing an ELF link. */
303 if (info
->hash
->creator
!= abfd
->xvec
)
307 *type_change_ok
= false;
308 *size_change_ok
= false;
311 bind
= ELF_ST_BIND (sym
->st_info
);
313 if (! bfd_is_und_section (sec
))
314 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
316 h
= ((struct elf_link_hash_entry
*)
317 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
322 /* If we just created the symbol, mark it as being an ELF symbol.
323 Other than that, there is nothing to do--there is no merge issue
324 with a newly defined symbol--so we just return. */
326 if (h
->root
.type
== bfd_link_hash_new
)
328 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
332 /* For merging, we only care about real symbols. */
334 while (h
->root
.type
== bfd_link_hash_indirect
335 || h
->root
.type
== bfd_link_hash_warning
)
336 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
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
;
573 /* Handle the special case of a new common symbol merging with an
574 old symbol that looks like it might be a common symbol defined in
575 a shared object. Note that we have already handled the case in
576 which a new common symbol should simply override the definition
577 in the shared library. */
580 && bfd_is_com_section (sec
)
583 /* It would be best if we could set the hash table entry to a
584 common symbol, but we don't know what to use for the section
586 if (! ((*info
->callbacks
->multiple_common
)
587 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
588 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
591 /* If the predumed common symbol in the dynamic object is
592 larger, pretend that the new symbol has its size. */
594 if (h
->size
> *pvalue
)
597 /* FIXME: We no longer know the alignment required by the symbol
598 in the dynamic object, so we just wind up using the one from
599 the regular object. */
602 olddyncommon
= false;
604 h
->root
.type
= bfd_link_hash_undefined
;
605 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
607 *size_change_ok
= true;
608 *type_change_ok
= true;
610 h
->verinfo
.vertree
= NULL
;
616 /* Add symbols from an ELF object file to the linker hash table. */
619 elf_link_add_object_symbols (abfd
, info
)
621 struct bfd_link_info
*info
;
623 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
624 const Elf_Internal_Sym
*,
625 const char **, flagword
*,
626 asection
**, bfd_vma
*));
627 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
628 asection
*, const Elf_Internal_Rela
*));
630 Elf_Internal_Shdr
*hdr
;
634 Elf_External_Sym
*buf
= NULL
;
635 struct elf_link_hash_entry
**sym_hash
;
637 bfd_byte
*dynver
= NULL
;
638 Elf_External_Versym
*extversym
= NULL
;
639 Elf_External_Versym
*ever
;
640 Elf_External_Dyn
*dynbuf
= NULL
;
641 struct elf_link_hash_entry
*weaks
;
642 Elf_External_Sym
*esym
;
643 Elf_External_Sym
*esymend
;
645 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
646 collect
= get_elf_backend_data (abfd
)->collect
;
648 if ((abfd
->flags
& DYNAMIC
) == 0)
654 /* You can't use -r against a dynamic object. Also, there's no
655 hope of using a dynamic object which does not exactly match
656 the format of the output file. */
657 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
659 bfd_set_error (bfd_error_invalid_operation
);
664 /* As a GNU extension, any input sections which are named
665 .gnu.warning.SYMBOL are treated as warning symbols for the given
666 symbol. This differs from .gnu.warning sections, which generate
667 warnings when they are included in an output file. */
672 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
676 name
= bfd_get_section_name (abfd
, s
);
677 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
682 name
+= sizeof ".gnu.warning." - 1;
684 /* If this is a shared object, then look up the symbol
685 in the hash table. If it is there, and it is already
686 been defined, then we will not be using the entry
687 from this shared object, so we don't need to warn.
688 FIXME: If we see the definition in a regular object
689 later on, we will warn, but we shouldn't. The only
690 fix is to keep track of what warnings we are supposed
691 to emit, and then handle them all at the end of the
693 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
695 struct elf_link_hash_entry
*h
;
697 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
700 /* FIXME: What about bfd_link_hash_common? */
702 && (h
->root
.type
== bfd_link_hash_defined
703 || h
->root
.type
== bfd_link_hash_defweak
))
705 /* We don't want to issue this warning. Clobber
706 the section size so that the warning does not
707 get copied into the output file. */
713 sz
= bfd_section_size (abfd
, s
);
714 msg
= (char *) bfd_alloc (abfd
, sz
);
718 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
721 if (! (_bfd_generic_link_add_one_symbol
722 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
723 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
726 if (! info
->relocateable
)
728 /* Clobber the section size so that the warning does
729 not get copied into the output file. */
736 /* If this is a dynamic object, we always link against the .dynsym
737 symbol table, not the .symtab symbol table. The dynamic linker
738 will only see the .dynsym symbol table, so there is no reason to
739 look at .symtab for a dynamic object. */
741 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
742 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
744 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
748 /* Read in any version definitions. */
750 if (! _bfd_elf_slurp_version_tables (abfd
))
753 /* Read in the symbol versions, but don't bother to convert them
754 to internal format. */
755 if (elf_dynversym (abfd
) != 0)
757 Elf_Internal_Shdr
*versymhdr
;
759 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
760 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
761 if (extversym
== NULL
)
763 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
764 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
765 != versymhdr
->sh_size
))
770 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
772 /* The sh_info field of the symtab header tells us where the
773 external symbols start. We don't care about the local symbols at
775 if (elf_bad_symtab (abfd
))
777 extsymcount
= symcount
;
782 extsymcount
= symcount
- hdr
->sh_info
;
783 extsymoff
= hdr
->sh_info
;
786 buf
= ((Elf_External_Sym
*)
787 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
788 if (buf
== NULL
&& extsymcount
!= 0)
791 /* We store a pointer to the hash table entry for each external
793 sym_hash
= ((struct elf_link_hash_entry
**)
795 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
796 if (sym_hash
== NULL
)
798 elf_sym_hashes (abfd
) = sym_hash
;
802 /* If we are creating a shared library, create all the dynamic
803 sections immediately. We need to attach them to something,
804 so we attach them to this BFD, provided it is the right
805 format. FIXME: If there are no input BFD's of the same
806 format as the output, we can't make a shared library. */
808 && ! elf_hash_table (info
)->dynamic_sections_created
809 && abfd
->xvec
== info
->hash
->creator
)
811 if (! elf_link_create_dynamic_sections (abfd
, info
))
820 bfd_size_type oldsize
;
821 bfd_size_type strindex
;
823 /* Find the name to use in a DT_NEEDED entry that refers to this
824 object. If the object has a DT_SONAME entry, we use it.
825 Otherwise, if the generic linker stuck something in
826 elf_dt_name, we use that. Otherwise, we just use the file
827 name. If the generic linker put a null string into
828 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
829 there is a DT_SONAME entry. */
831 name
= bfd_get_filename (abfd
);
832 if (elf_dt_name (abfd
) != NULL
)
834 name
= elf_dt_name (abfd
);
838 s
= bfd_get_section_by_name (abfd
, ".dynamic");
841 Elf_External_Dyn
*extdyn
;
842 Elf_External_Dyn
*extdynend
;
846 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
850 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
851 (file_ptr
) 0, s
->_raw_size
))
854 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
857 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
860 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
861 for (; extdyn
< extdynend
; extdyn
++)
863 Elf_Internal_Dyn dyn
;
865 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
866 if (dyn
.d_tag
== DT_SONAME
)
868 name
= bfd_elf_string_from_elf_section (abfd
, link
,
873 if (dyn
.d_tag
== DT_NEEDED
)
875 struct bfd_link_needed_list
*n
, **pn
;
878 n
= ((struct bfd_link_needed_list
*)
879 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
880 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
882 if (n
== NULL
|| fnm
== NULL
)
884 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
891 for (pn
= &elf_hash_table (info
)->needed
;
903 /* We do not want to include any of the sections in a dynamic
904 object in the output file. We hack by simply clobbering the
905 list of sections in the BFD. This could be handled more
906 cleanly by, say, a new section flag; the existing
907 SEC_NEVER_LOAD flag is not the one we want, because that one
908 still implies that the section takes up space in the output
910 abfd
->sections
= NULL
;
911 abfd
->section_count
= 0;
913 /* If this is the first dynamic object found in the link, create
914 the special sections required for dynamic linking. */
915 if (! elf_hash_table (info
)->dynamic_sections_created
)
917 if (! elf_link_create_dynamic_sections (abfd
, info
))
923 /* Add a DT_NEEDED entry for this dynamic object. */
924 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
925 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
927 if (strindex
== (bfd_size_type
) -1)
930 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
933 Elf_External_Dyn
*dyncon
, *dynconend
;
935 /* The hash table size did not change, which means that
936 the dynamic object name was already entered. If we
937 have already included this dynamic object in the
938 link, just ignore it. There is no reason to include
939 a particular dynamic object more than once. */
940 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
942 BFD_ASSERT (sdyn
!= NULL
);
944 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
945 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
947 for (; dyncon
< dynconend
; dyncon
++)
949 Elf_Internal_Dyn dyn
;
951 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
953 if (dyn
.d_tag
== DT_NEEDED
954 && dyn
.d_un
.d_val
== strindex
)
958 if (extversym
!= NULL
)
965 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
969 /* Save the SONAME, if there is one, because sometimes the
970 linker emulation code will need to know it. */
972 name
= bfd_get_filename (abfd
);
973 elf_dt_name (abfd
) = name
;
977 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
979 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
980 != extsymcount
* sizeof (Elf_External_Sym
)))
985 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
986 esymend
= buf
+ extsymcount
;
989 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
991 Elf_Internal_Sym sym
;
997 struct elf_link_hash_entry
*h
;
999 boolean size_change_ok
, type_change_ok
;
1000 boolean new_weakdef
;
1001 unsigned int old_alignment
;
1003 elf_swap_symbol_in (abfd
, esym
, &sym
);
1005 flags
= BSF_NO_FLAGS
;
1007 value
= sym
.st_value
;
1010 bind
= ELF_ST_BIND (sym
.st_info
);
1011 if (bind
== STB_LOCAL
)
1013 /* This should be impossible, since ELF requires that all
1014 global symbols follow all local symbols, and that sh_info
1015 point to the first global symbol. Unfortunatealy, Irix 5
1019 else if (bind
== STB_GLOBAL
)
1021 if (sym
.st_shndx
!= SHN_UNDEF
1022 && sym
.st_shndx
!= SHN_COMMON
)
1027 else if (bind
== STB_WEAK
)
1031 /* Leave it up to the processor backend. */
1034 if (sym
.st_shndx
== SHN_UNDEF
)
1035 sec
= bfd_und_section_ptr
;
1036 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1038 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1040 sec
= bfd_abs_section_ptr
;
1041 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1044 else if (sym
.st_shndx
== SHN_ABS
)
1045 sec
= bfd_abs_section_ptr
;
1046 else if (sym
.st_shndx
== SHN_COMMON
)
1048 sec
= bfd_com_section_ptr
;
1049 /* What ELF calls the size we call the value. What ELF
1050 calls the value we call the alignment. */
1051 value
= sym
.st_size
;
1055 /* Leave it up to the processor backend. */
1058 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1059 if (name
== (const char *) NULL
)
1062 if (add_symbol_hook
)
1064 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1068 /* The hook function sets the name to NULL if this symbol
1069 should be skipped for some reason. */
1070 if (name
== (const char *) NULL
)
1074 /* Sanity check that all possibilities were handled. */
1075 if (sec
== (asection
*) NULL
)
1077 bfd_set_error (bfd_error_bad_value
);
1081 if (bfd_is_und_section (sec
)
1082 || bfd_is_com_section (sec
))
1087 size_change_ok
= false;
1088 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1090 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1092 Elf_Internal_Versym iver
;
1098 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1099 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1101 /* If this is a hidden symbol, or if it is not version
1102 1, we append the version name to the symbol name.
1103 However, we do not modify a non-hidden absolute
1104 symbol, because it might be the version symbol
1105 itself. FIXME: What if it isn't? */
1106 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1107 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1110 int namelen
, newlen
;
1113 if (sym
.st_shndx
!= SHN_UNDEF
)
1115 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1117 (*_bfd_error_handler
)
1118 ("%s: %s: invalid version %d (max %d)",
1119 abfd
->filename
, name
, vernum
,
1120 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1121 bfd_set_error (bfd_error_bad_value
);
1124 else if (vernum
> 1)
1126 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1132 /* We cannot simply test for the number of
1133 entries in the VERNEED section since the
1134 numbers for the needed versions do not start
1136 Elf_Internal_Verneed
*t
;
1139 for (t
= elf_tdata (abfd
)->verref
;
1143 Elf_Internal_Vernaux
*a
;
1145 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1147 if (a
->vna_other
== vernum
)
1149 verstr
= a
->vna_nodename
;
1158 (*_bfd_error_handler
)
1159 ("%s: %s: invalid needed version %d",
1160 abfd
->filename
, name
, vernum
);
1161 bfd_set_error (bfd_error_bad_value
);
1166 namelen
= strlen (name
);
1167 newlen
= namelen
+ strlen (verstr
) + 2;
1168 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1171 newname
= (char *) bfd_alloc (abfd
, newlen
);
1172 if (newname
== NULL
)
1174 strcpy (newname
, name
);
1175 p
= newname
+ namelen
;
1177 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1185 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1186 sym_hash
, &override
, &type_change_ok
,
1194 while (h
->root
.type
== bfd_link_hash_indirect
1195 || h
->root
.type
== bfd_link_hash_warning
)
1196 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1198 /* Remember the old alignment if this is a common symbol, so
1199 that we don't reduce the alignment later on. We can't
1200 check later, because _bfd_generic_link_add_one_symbol
1201 will set a default for the alignment which we want to
1203 if (h
->root
.type
== bfd_link_hash_common
)
1204 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1209 && (h
->verinfo
.verdef
== NULL
|| definition
))
1210 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1213 if (! (_bfd_generic_link_add_one_symbol
1214 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1215 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1219 while (h
->root
.type
== bfd_link_hash_indirect
1220 || h
->root
.type
== bfd_link_hash_warning
)
1221 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1224 new_weakdef
= false;
1227 && (flags
& BSF_WEAK
) != 0
1228 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1229 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1230 && h
->weakdef
== NULL
)
1232 /* Keep a list of all weak defined non function symbols from
1233 a dynamic object, using the weakdef field. Later in this
1234 function we will set the weakdef field to the correct
1235 value. We only put non-function symbols from dynamic
1236 objects on this list, because that happens to be the only
1237 time we need to know the normal symbol corresponding to a
1238 weak symbol, and the information is time consuming to
1239 figure out. If the weakdef field is not already NULL,
1240 then this symbol was already defined by some previous
1241 dynamic object, and we will be using that previous
1242 definition anyhow. */
1249 /* Set the alignment of a common symbol. */
1250 if (sym
.st_shndx
== SHN_COMMON
1251 && h
->root
.type
== bfd_link_hash_common
)
1255 align
= bfd_log2 (sym
.st_value
);
1256 if (align
> old_alignment
)
1257 h
->root
.u
.c
.p
->alignment_power
= align
;
1260 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1266 /* Remember the symbol size and type. */
1267 if (sym
.st_size
!= 0
1268 && (definition
|| h
->size
== 0))
1270 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1271 (*_bfd_error_handler
)
1272 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1273 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1274 bfd_get_filename (abfd
));
1276 h
->size
= sym
.st_size
;
1279 /* If this is a common symbol, then we always want H->SIZE
1280 to be the size of the common symbol. The code just above
1281 won't fix the size if a common symbol becomes larger. We
1282 don't warn about a size change here, because that is
1283 covered by --warn-common. */
1284 if (h
->root
.type
== bfd_link_hash_common
)
1285 h
->size
= h
->root
.u
.c
.size
;
1287 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1288 && (definition
|| h
->type
== STT_NOTYPE
))
1290 if (h
->type
!= STT_NOTYPE
1291 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1292 && ! type_change_ok
)
1293 (*_bfd_error_handler
)
1294 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1295 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1296 bfd_get_filename (abfd
));
1298 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1301 if (sym
.st_other
!= 0
1302 && (definition
|| h
->other
== 0))
1303 h
->other
= sym
.st_other
;
1305 /* Set a flag in the hash table entry indicating the type of
1306 reference or definition we just found. Keep a count of
1307 the number of dynamic symbols we find. A dynamic symbol
1308 is one which is referenced or defined by both a regular
1309 object and a shared object. */
1310 old_flags
= h
->elf_link_hash_flags
;
1315 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1317 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1319 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1320 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1326 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1328 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1329 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1330 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1331 || (h
->weakdef
!= NULL
1333 && h
->weakdef
->dynindx
!= -1))
1337 h
->elf_link_hash_flags
|= new_flag
;
1339 /* If this symbol has a version, and it is the default
1340 version, we create an indirect symbol from the default
1341 name to the fully decorated name. This will cause
1342 external references which do not specify a version to be
1343 bound to this version of the symbol. */
1348 p
= strchr (name
, ELF_VER_CHR
);
1349 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1352 struct elf_link_hash_entry
*hi
;
1355 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1357 if (shortname
== NULL
)
1359 strncpy (shortname
, name
, p
- name
);
1360 shortname
[p
- name
] = '\0';
1362 /* We are going to create a new symbol. Merge it
1363 with any existing symbol with this name. For the
1364 purposes of the merge, act as though we were
1365 defining the symbol we just defined, although we
1366 actually going to define an indirect symbol. */
1367 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1368 &value
, &hi
, &override
,
1369 &type_change_ok
, &size_change_ok
))
1374 if (! (_bfd_generic_link_add_one_symbol
1375 (info
, abfd
, shortname
, BSF_INDIRECT
,
1376 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1377 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1380 /* If there is a duplicate definition somewhere,
1381 then HI may not point to an indirect symbol.
1382 We will have reported an error to the user in
1385 if (hi
->root
.type
== bfd_link_hash_indirect
)
1387 /* If the symbol became indirect, then we
1388 assume that we have not seen a definition
1390 BFD_ASSERT ((hi
->elf_link_hash_flags
1391 & (ELF_LINK_HASH_DEF_DYNAMIC
1392 | ELF_LINK_HASH_DEF_REGULAR
))
1395 /* Copy down any references that we may have
1396 already seen to the symbol which just
1398 h
->elf_link_hash_flags
|=
1399 (hi
->elf_link_hash_flags
1400 & (ELF_LINK_HASH_REF_DYNAMIC
1401 | ELF_LINK_HASH_REF_REGULAR
));
1403 /* Copy over the global table offset entry.
1404 This may have been already set up by a
1405 check_relocs routine. */
1406 if (h
->got_offset
== (bfd_vma
) -1)
1408 h
->got_offset
= hi
->got_offset
;
1409 hi
->got_offset
= (bfd_vma
) -1;
1411 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1413 if (h
->dynindx
== -1)
1415 h
->dynindx
= hi
->dynindx
;
1416 h
->dynstr_index
= hi
->dynstr_index
;
1418 hi
->dynstr_index
= 0;
1420 BFD_ASSERT (hi
->dynindx
== -1);
1422 /* FIXME: There may be other information to
1423 copy over for particular targets. */
1425 /* See if the new flags lead us to realize
1426 that the symbol must be dynamic. */
1432 || ((hi
->elf_link_hash_flags
1433 & ELF_LINK_HASH_REF_DYNAMIC
)
1439 if ((hi
->elf_link_hash_flags
1440 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1447 /* We also need to define an indirection from the
1448 nondefault version of the symbol. */
1450 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1452 if (shortname
== NULL
)
1454 strncpy (shortname
, name
, p
- name
);
1455 strcpy (shortname
+ (p
- name
), p
+ 1);
1457 /* Once again, merge with any existing symbol. */
1458 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1459 &value
, &hi
, &override
,
1460 &type_change_ok
, &size_change_ok
))
1465 if (! (_bfd_generic_link_add_one_symbol
1466 (info
, abfd
, shortname
, BSF_INDIRECT
,
1467 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1468 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1471 /* If there is a duplicate definition somewhere,
1472 then HI may not point to an indirect symbol.
1473 We will have reported an error to the user in
1476 if (hi
->root
.type
== bfd_link_hash_indirect
)
1478 /* If the symbol became indirect, then we
1479 assume that we have not seen a definition
1481 BFD_ASSERT ((hi
->elf_link_hash_flags
1482 & (ELF_LINK_HASH_DEF_DYNAMIC
1483 | ELF_LINK_HASH_DEF_REGULAR
))
1486 /* Copy down any references that we may have
1487 already seen to the symbol which just
1489 h
->elf_link_hash_flags
|=
1490 (hi
->elf_link_hash_flags
1491 & (ELF_LINK_HASH_REF_DYNAMIC
1492 | ELF_LINK_HASH_REF_REGULAR
));
1494 /* Copy over the global table offset entry.
1495 This may have been already set up by a
1496 check_relocs routine. */
1497 if (h
->got_offset
== (bfd_vma
) -1)
1499 h
->got_offset
= hi
->got_offset
;
1500 hi
->got_offset
= (bfd_vma
) -1;
1502 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1504 if (h
->dynindx
== -1)
1506 h
->dynindx
= hi
->dynindx
;
1507 h
->dynstr_index
= hi
->dynstr_index
;
1509 hi
->dynstr_index
= 0;
1511 BFD_ASSERT (hi
->dynindx
== -1);
1513 /* FIXME: There may be other information to
1514 copy over for particular targets. */
1516 /* See if the new flags lead us to realize
1517 that the symbol must be dynamic. */
1523 || ((hi
->elf_link_hash_flags
1524 & ELF_LINK_HASH_REF_DYNAMIC
)
1530 if ((hi
->elf_link_hash_flags
1531 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1540 if (dynsym
&& h
->dynindx
== -1)
1542 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1544 if (h
->weakdef
!= NULL
1546 && h
->weakdef
->dynindx
== -1)
1548 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1556 /* Now set the weakdefs field correctly for all the weak defined
1557 symbols we found. The only way to do this is to search all the
1558 symbols. Since we only need the information for non functions in
1559 dynamic objects, that's the only time we actually put anything on
1560 the list WEAKS. We need this information so that if a regular
1561 object refers to a symbol defined weakly in a dynamic object, the
1562 real symbol in the dynamic object is also put in the dynamic
1563 symbols; we also must arrange for both symbols to point to the
1564 same memory location. We could handle the general case of symbol
1565 aliasing, but a general symbol alias can only be generated in
1566 assembler code, handling it correctly would be very time
1567 consuming, and other ELF linkers don't handle general aliasing
1569 while (weaks
!= NULL
)
1571 struct elf_link_hash_entry
*hlook
;
1574 struct elf_link_hash_entry
**hpp
;
1575 struct elf_link_hash_entry
**hppend
;
1578 weaks
= hlook
->weakdef
;
1579 hlook
->weakdef
= NULL
;
1581 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1582 || hlook
->root
.type
== bfd_link_hash_defweak
1583 || hlook
->root
.type
== bfd_link_hash_common
1584 || hlook
->root
.type
== bfd_link_hash_indirect
);
1585 slook
= hlook
->root
.u
.def
.section
;
1586 vlook
= hlook
->root
.u
.def
.value
;
1588 hpp
= elf_sym_hashes (abfd
);
1589 hppend
= hpp
+ extsymcount
;
1590 for (; hpp
< hppend
; hpp
++)
1592 struct elf_link_hash_entry
*h
;
1595 if (h
!= NULL
&& h
!= hlook
1596 && h
->root
.type
== bfd_link_hash_defined
1597 && h
->root
.u
.def
.section
== slook
1598 && h
->root
.u
.def
.value
== vlook
)
1602 /* If the weak definition is in the list of dynamic
1603 symbols, make sure the real definition is put there
1605 if (hlook
->dynindx
!= -1
1606 && h
->dynindx
== -1)
1608 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1612 /* If the real definition is in the list of dynamic
1613 symbols, make sure the weak definition is put there
1614 as well. If we don't do this, then the dynamic
1615 loader might not merge the entries for the real
1616 definition and the weak definition. */
1617 if (h
->dynindx
!= -1
1618 && hlook
->dynindx
== -1)
1620 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1635 if (extversym
!= NULL
)
1641 /* If this object is the same format as the output object, and it is
1642 not a shared library, then let the backend look through the
1645 This is required to build global offset table entries and to
1646 arrange for dynamic relocs. It is not required for the
1647 particular common case of linking non PIC code, even when linking
1648 against shared libraries, but unfortunately there is no way of
1649 knowing whether an object file has been compiled PIC or not.
1650 Looking through the relocs is not particularly time consuming.
1651 The problem is that we must either (1) keep the relocs in memory,
1652 which causes the linker to require additional runtime memory or
1653 (2) read the relocs twice from the input file, which wastes time.
1654 This would be a good case for using mmap.
1656 I have no idea how to handle linking PIC code into a file of a
1657 different format. It probably can't be done. */
1658 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1660 && abfd
->xvec
== info
->hash
->creator
1661 && check_relocs
!= NULL
)
1665 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1667 Elf_Internal_Rela
*internal_relocs
;
1670 if ((o
->flags
& SEC_RELOC
) == 0
1671 || o
->reloc_count
== 0
1672 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1673 && (o
->flags
& SEC_DEBUGGING
) != 0)
1674 || bfd_is_abs_section (o
->output_section
))
1677 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1678 (abfd
, o
, (PTR
) NULL
,
1679 (Elf_Internal_Rela
*) NULL
,
1680 info
->keep_memory
));
1681 if (internal_relocs
== NULL
)
1684 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1686 if (! info
->keep_memory
)
1687 free (internal_relocs
);
1694 /* If this is a non-traditional, non-relocateable link, try to
1695 optimize the handling of the .stab/.stabstr sections. */
1697 && ! info
->relocateable
1698 && ! info
->traditional_format
1699 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1700 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1702 asection
*stab
, *stabstr
;
1704 stab
= bfd_get_section_by_name (abfd
, ".stab");
1707 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1709 if (stabstr
!= NULL
)
1711 struct bfd_elf_section_data
*secdata
;
1713 secdata
= elf_section_data (stab
);
1714 if (! _bfd_link_section_stabs (abfd
,
1715 &elf_hash_table (info
)->stab_info
,
1717 &secdata
->stab_info
))
1732 if (extversym
!= NULL
)
1737 /* Create some sections which will be filled in with dynamic linking
1738 information. ABFD is an input file which requires dynamic sections
1739 to be created. The dynamic sections take up virtual memory space
1740 when the final executable is run, so we need to create them before
1741 addresses are assigned to the output sections. We work out the
1742 actual contents and size of these sections later. */
1745 elf_link_create_dynamic_sections (abfd
, info
)
1747 struct bfd_link_info
*info
;
1750 register asection
*s
;
1751 struct elf_link_hash_entry
*h
;
1752 struct elf_backend_data
*bed
;
1754 if (elf_hash_table (info
)->dynamic_sections_created
)
1757 /* Make sure that all dynamic sections use the same input BFD. */
1758 if (elf_hash_table (info
)->dynobj
== NULL
)
1759 elf_hash_table (info
)->dynobj
= abfd
;
1761 abfd
= elf_hash_table (info
)->dynobj
;
1763 /* Note that we set the SEC_IN_MEMORY flag for all of these
1765 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1766 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1768 /* A dynamically linked executable has a .interp section, but a
1769 shared library does not. */
1772 s
= bfd_make_section (abfd
, ".interp");
1774 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1778 /* Create sections to hold version informations. These are removed
1779 if they are not needed. */
1780 s
= bfd_make_section (abfd
, ".gnu.version_d");
1782 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1783 || ! bfd_set_section_alignment (abfd
, s
, 2))
1786 s
= bfd_make_section (abfd
, ".gnu.version");
1788 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1789 || ! bfd_set_section_alignment (abfd
, s
, 1))
1792 s
= bfd_make_section (abfd
, ".gnu.version_r");
1794 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1795 || ! bfd_set_section_alignment (abfd
, s
, 2))
1798 s
= bfd_make_section (abfd
, ".dynsym");
1800 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1801 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1804 s
= bfd_make_section (abfd
, ".dynstr");
1806 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1809 /* Create a strtab to hold the dynamic symbol names. */
1810 if (elf_hash_table (info
)->dynstr
== NULL
)
1812 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1813 if (elf_hash_table (info
)->dynstr
== NULL
)
1817 s
= bfd_make_section (abfd
, ".dynamic");
1819 || ! bfd_set_section_flags (abfd
, s
, flags
)
1820 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1823 /* The special symbol _DYNAMIC is always set to the start of the
1824 .dynamic section. This call occurs before we have processed the
1825 symbols for any dynamic object, so we don't have to worry about
1826 overriding a dynamic definition. We could set _DYNAMIC in a
1827 linker script, but we only want to define it if we are, in fact,
1828 creating a .dynamic section. We don't want to define it if there
1829 is no .dynamic section, since on some ELF platforms the start up
1830 code examines it to decide how to initialize the process. */
1832 if (! (_bfd_generic_link_add_one_symbol
1833 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1834 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1835 (struct bfd_link_hash_entry
**) &h
)))
1837 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1838 h
->type
= STT_OBJECT
;
1841 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1844 s
= bfd_make_section (abfd
, ".hash");
1846 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1847 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1850 /* Let the backend create the rest of the sections. This lets the
1851 backend set the right flags. The backend will normally create
1852 the .got and .plt sections. */
1853 bed
= get_elf_backend_data (abfd
);
1854 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1857 elf_hash_table (info
)->dynamic_sections_created
= true;
1862 /* Add an entry to the .dynamic table. */
1865 elf_add_dynamic_entry (info
, tag
, val
)
1866 struct bfd_link_info
*info
;
1870 Elf_Internal_Dyn dyn
;
1874 bfd_byte
*newcontents
;
1876 dynobj
= elf_hash_table (info
)->dynobj
;
1878 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1879 BFD_ASSERT (s
!= NULL
);
1881 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1882 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1883 if (newcontents
== NULL
)
1887 dyn
.d_un
.d_val
= val
;
1888 elf_swap_dyn_out (dynobj
, &dyn
,
1889 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1891 s
->_raw_size
= newsize
;
1892 s
->contents
= newcontents
;
1898 /* Read and swap the relocs for a section. They may have been cached.
1899 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1900 they are used as buffers to read into. They are known to be large
1901 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1902 value is allocated using either malloc or bfd_alloc, according to
1903 the KEEP_MEMORY argument. */
1906 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1910 PTR external_relocs
;
1911 Elf_Internal_Rela
*internal_relocs
;
1912 boolean keep_memory
;
1914 Elf_Internal_Shdr
*rel_hdr
;
1916 Elf_Internal_Rela
*alloc2
= NULL
;
1918 if (elf_section_data (o
)->relocs
!= NULL
)
1919 return elf_section_data (o
)->relocs
;
1921 if (o
->reloc_count
== 0)
1924 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1926 if (internal_relocs
== NULL
)
1930 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1932 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1934 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1935 if (internal_relocs
== NULL
)
1939 if (external_relocs
== NULL
)
1941 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1944 external_relocs
= alloc1
;
1947 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1948 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1949 != rel_hdr
->sh_size
))
1952 /* Swap in the relocs. For convenience, we always produce an
1953 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1955 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1957 Elf_External_Rel
*erel
;
1958 Elf_External_Rel
*erelend
;
1959 Elf_Internal_Rela
*irela
;
1961 erel
= (Elf_External_Rel
*) external_relocs
;
1962 erelend
= erel
+ o
->reloc_count
;
1963 irela
= internal_relocs
;
1964 for (; erel
< erelend
; erel
++, irela
++)
1966 Elf_Internal_Rel irel
;
1968 elf_swap_reloc_in (abfd
, erel
, &irel
);
1969 irela
->r_offset
= irel
.r_offset
;
1970 irela
->r_info
= irel
.r_info
;
1971 irela
->r_addend
= 0;
1976 Elf_External_Rela
*erela
;
1977 Elf_External_Rela
*erelaend
;
1978 Elf_Internal_Rela
*irela
;
1980 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1982 erela
= (Elf_External_Rela
*) external_relocs
;
1983 erelaend
= erela
+ o
->reloc_count
;
1984 irela
= internal_relocs
;
1985 for (; erela
< erelaend
; erela
++, irela
++)
1986 elf_swap_reloca_in (abfd
, erela
, irela
);
1989 /* Cache the results for next time, if we can. */
1991 elf_section_data (o
)->relocs
= internal_relocs
;
1996 /* Don't free alloc2, since if it was allocated we are passing it
1997 back (under the name of internal_relocs). */
1999 return internal_relocs
;
2010 /* Record an assignment to a symbol made by a linker script. We need
2011 this in case some dynamic object refers to this symbol. */
2015 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2017 struct bfd_link_info
*info
;
2021 struct elf_link_hash_entry
*h
;
2023 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2026 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2030 if (h
->root
.type
== bfd_link_hash_new
)
2031 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2033 /* If this symbol is being provided by the linker script, and it is
2034 currently defined by a dynamic object, but not by a regular
2035 object, then mark it as undefined so that the generic linker will
2036 force the correct value. */
2038 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2039 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2040 h
->root
.type
= bfd_link_hash_undefined
;
2042 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2043 h
->type
= STT_OBJECT
;
2045 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2046 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2048 && h
->dynindx
== -1)
2050 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2053 /* If this is a weak defined symbol, and we know a corresponding
2054 real symbol from the same dynamic object, make sure the real
2055 symbol is also made into a dynamic symbol. */
2056 if (h
->weakdef
!= NULL
2057 && h
->weakdef
->dynindx
== -1)
2059 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2067 /* This structure is used to pass information to
2068 elf_link_assign_sym_version. */
2070 struct elf_assign_sym_version_info
2074 /* General link information. */
2075 struct bfd_link_info
*info
;
2077 struct bfd_elf_version_tree
*verdefs
;
2078 /* Whether we are exporting all dynamic symbols. */
2079 boolean export_dynamic
;
2080 /* Whether we removed any symbols from the dynamic symbol table. */
2081 boolean removed_dynamic
;
2082 /* Whether we had a failure. */
2086 /* This structure is used to pass information to
2087 elf_link_find_version_dependencies. */
2089 struct elf_find_verdep_info
2093 /* General link information. */
2094 struct bfd_link_info
*info
;
2095 /* The number of dependencies. */
2097 /* Whether we had a failure. */
2101 /* Array used to determine the number of hash table buckets to use
2102 based on the number of symbols there are. If there are fewer than
2103 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2104 fewer than 37 we use 17 buckets, and so forth. We never use more
2105 than 32771 buckets. */
2107 static const size_t elf_buckets
[] =
2109 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2113 /* Set up the sizes and contents of the ELF dynamic sections. This is
2114 called by the ELF linker emulation before_allocation routine. We
2115 must set the sizes of the sections before the linker sets the
2116 addresses of the various sections. */
2119 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2120 export_dynamic
, filter_shlib
,
2121 auxiliary_filters
, info
, sinterpptr
,
2126 boolean export_dynamic
;
2127 const char *filter_shlib
;
2128 const char * const *auxiliary_filters
;
2129 struct bfd_link_info
*info
;
2130 asection
**sinterpptr
;
2131 struct bfd_elf_version_tree
*verdefs
;
2133 bfd_size_type soname_indx
;
2135 struct elf_backend_data
*bed
;
2136 bfd_size_type old_dynsymcount
;
2137 struct elf_assign_sym_version_info asvinfo
;
2143 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2146 /* The backend may have to create some sections regardless of whether
2147 we're dynamic or not. */
2148 bed
= get_elf_backend_data (output_bfd
);
2149 if (bed
->elf_backend_always_size_sections
2150 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2153 dynobj
= elf_hash_table (info
)->dynobj
;
2155 /* If there were no dynamic objects in the link, there is nothing to
2160 /* If we are supposed to export all symbols into the dynamic symbol
2161 table (this is not the normal case), then do so. */
2164 struct elf_info_failed eif
;
2168 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2174 if (elf_hash_table (info
)->dynamic_sections_created
)
2176 struct elf_info_failed eif
;
2177 struct elf_link_hash_entry
*h
;
2178 bfd_size_type strsize
;
2180 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2181 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2185 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2186 soname
, true, true);
2187 if (soname_indx
== (bfd_size_type
) -1
2188 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2194 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2202 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2204 if (indx
== (bfd_size_type
) -1
2205 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2209 if (filter_shlib
!= NULL
)
2213 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2214 filter_shlib
, true, true);
2215 if (indx
== (bfd_size_type
) -1
2216 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2220 if (auxiliary_filters
!= NULL
)
2222 const char * const *p
;
2224 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2228 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2230 if (indx
== (bfd_size_type
) -1
2231 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2236 /* Attach all the symbols to their version information. */
2237 asvinfo
.output_bfd
= output_bfd
;
2238 asvinfo
.info
= info
;
2239 asvinfo
.verdefs
= verdefs
;
2240 asvinfo
.export_dynamic
= export_dynamic
;
2241 asvinfo
.removed_dynamic
= false;
2242 asvinfo
.failed
= false;
2244 elf_link_hash_traverse (elf_hash_table (info
),
2245 elf_link_assign_sym_version
,
2250 /* Find all symbols which were defined in a dynamic object and make
2251 the backend pick a reasonable value for them. */
2254 elf_link_hash_traverse (elf_hash_table (info
),
2255 elf_adjust_dynamic_symbol
,
2260 /* Add some entries to the .dynamic section. We fill in some of the
2261 values later, in elf_bfd_final_link, but we must add the entries
2262 now so that we know the final size of the .dynamic section. */
2263 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2266 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2267 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2269 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2272 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2275 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2276 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2278 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2281 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2282 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2283 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2284 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2285 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2286 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2287 sizeof (Elf_External_Sym
)))
2291 /* The backend must work out the sizes of all the other dynamic
2293 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2294 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2297 if (elf_hash_table (info
)->dynamic_sections_created
)
2302 size_t bucketcount
= 0;
2303 Elf_Internal_Sym isym
;
2305 /* Set up the version definition section. */
2306 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2307 BFD_ASSERT (s
!= NULL
);
2309 /* We may have created additional version definitions if we are
2310 just linking a regular application. */
2311 verdefs
= asvinfo
.verdefs
;
2313 if (verdefs
== NULL
)
2317 /* Don't include this section in the output file. */
2318 for (spp
= &output_bfd
->sections
;
2319 *spp
!= s
->output_section
;
2320 spp
= &(*spp
)->next
)
2322 *spp
= s
->output_section
->next
;
2323 --output_bfd
->section_count
;
2329 struct bfd_elf_version_tree
*t
;
2331 Elf_Internal_Verdef def
;
2332 Elf_Internal_Verdaux defaux
;
2334 if (asvinfo
.removed_dynamic
)
2336 /* Some dynamic symbols were changed to be local
2337 symbols. In this case, we renumber all of the
2338 dynamic symbols, so that we don't have a hole. If
2339 the backend changed dynsymcount, then assume that the
2340 new symbols are at the start. This is the case on
2341 the MIPS. FIXME: The names of the removed symbols
2342 will still be in the dynamic string table, wasting
2344 elf_hash_table (info
)->dynsymcount
=
2345 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2346 elf_link_hash_traverse (elf_hash_table (info
),
2347 elf_link_renumber_dynsyms
,
2354 /* Make space for the base version. */
2355 size
+= sizeof (Elf_External_Verdef
);
2356 size
+= sizeof (Elf_External_Verdaux
);
2359 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2361 struct bfd_elf_version_deps
*n
;
2363 size
+= sizeof (Elf_External_Verdef
);
2364 size
+= sizeof (Elf_External_Verdaux
);
2367 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2368 size
+= sizeof (Elf_External_Verdaux
);
2371 s
->_raw_size
= size
;
2372 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2373 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2376 /* Fill in the version definition section. */
2380 def
.vd_version
= VER_DEF_CURRENT
;
2381 def
.vd_flags
= VER_FLG_BASE
;
2384 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2385 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2386 + sizeof (Elf_External_Verdaux
));
2388 if (soname_indx
!= -1)
2390 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2391 defaux
.vda_name
= soname_indx
;
2398 name
= output_bfd
->filename
;
2399 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2400 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2402 if (indx
== (bfd_size_type
) -1)
2404 defaux
.vda_name
= indx
;
2406 defaux
.vda_next
= 0;
2408 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2409 (Elf_External_Verdef
*)p
);
2410 p
+= sizeof (Elf_External_Verdef
);
2411 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2412 (Elf_External_Verdaux
*) p
);
2413 p
+= sizeof (Elf_External_Verdaux
);
2415 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2418 struct bfd_elf_version_deps
*n
;
2419 struct elf_link_hash_entry
*h
;
2422 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2425 /* Add a symbol representing this version. */
2427 if (! (_bfd_generic_link_add_one_symbol
2428 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2429 (bfd_vma
) 0, (const char *) NULL
, false,
2430 get_elf_backend_data (dynobj
)->collect
,
2431 (struct bfd_link_hash_entry
**) &h
)))
2433 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2434 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2435 h
->type
= STT_OBJECT
;
2436 h
->verinfo
.vertree
= t
;
2438 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2441 def
.vd_version
= VER_DEF_CURRENT
;
2443 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2444 def
.vd_flags
|= VER_FLG_WEAK
;
2445 def
.vd_ndx
= t
->vernum
+ 1;
2446 def
.vd_cnt
= cdeps
+ 1;
2447 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2448 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2449 if (t
->next
!= NULL
)
2450 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2451 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2455 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2456 (Elf_External_Verdef
*) p
);
2457 p
+= sizeof (Elf_External_Verdef
);
2459 defaux
.vda_name
= h
->dynstr_index
;
2460 if (t
->deps
== NULL
)
2461 defaux
.vda_next
= 0;
2463 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2464 t
->name_indx
= defaux
.vda_name
;
2466 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2467 (Elf_External_Verdaux
*) p
);
2468 p
+= sizeof (Elf_External_Verdaux
);
2470 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2472 defaux
.vda_name
= n
->version_needed
->name_indx
;
2473 if (n
->next
== NULL
)
2474 defaux
.vda_next
= 0;
2476 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2478 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2479 (Elf_External_Verdaux
*) p
);
2480 p
+= sizeof (Elf_External_Verdaux
);
2484 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2485 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2488 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2491 /* Work out the size of the version reference section. */
2493 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2494 BFD_ASSERT (s
!= NULL
);
2496 struct elf_find_verdep_info sinfo
;
2498 sinfo
.output_bfd
= output_bfd
;
2500 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2501 if (sinfo
.vers
== 0)
2503 sinfo
.failed
= false;
2505 elf_link_hash_traverse (elf_hash_table (info
),
2506 elf_link_find_version_dependencies
,
2509 if (elf_tdata (output_bfd
)->verref
== NULL
)
2513 /* We don't have any version definitions, so we can just
2514 remove the section. */
2516 for (spp
= &output_bfd
->sections
;
2517 *spp
!= s
->output_section
;
2518 spp
= &(*spp
)->next
)
2520 *spp
= s
->output_section
->next
;
2521 --output_bfd
->section_count
;
2525 Elf_Internal_Verneed
*t
;
2530 /* Build the version definition section. */
2533 for (t
= elf_tdata (output_bfd
)->verref
;
2537 Elf_Internal_Vernaux
*a
;
2539 size
+= sizeof (Elf_External_Verneed
);
2541 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2542 size
+= sizeof (Elf_External_Vernaux
);
2545 s
->_raw_size
= size
;
2546 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2547 if (s
->contents
== NULL
)
2551 for (t
= elf_tdata (output_bfd
)->verref
;
2556 Elf_Internal_Vernaux
*a
;
2560 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2563 t
->vn_version
= VER_NEED_CURRENT
;
2565 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2566 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2567 elf_dt_name (t
->vn_bfd
),
2570 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2571 t
->vn_bfd
->filename
, true, false);
2572 if (indx
== (bfd_size_type
) -1)
2575 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2576 if (t
->vn_nextref
== NULL
)
2579 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2580 + caux
* sizeof (Elf_External_Vernaux
));
2582 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2583 (Elf_External_Verneed
*) p
);
2584 p
+= sizeof (Elf_External_Verneed
);
2586 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2588 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2590 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2591 a
->vna_nodename
, true, false);
2592 if (indx
== (bfd_size_type
) -1)
2595 if (a
->vna_nextptr
== NULL
)
2598 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2600 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2601 (Elf_External_Vernaux
*) p
);
2602 p
+= sizeof (Elf_External_Vernaux
);
2606 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2607 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2610 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2614 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2616 /* Work out the size of the symbol version section. */
2617 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2618 BFD_ASSERT (s
!= NULL
);
2619 if (dynsymcount
== 0
2620 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2624 /* We don't need any symbol versions; just discard the
2626 for (spp
= &output_bfd
->sections
;
2627 *spp
!= s
->output_section
;
2628 spp
= &(*spp
)->next
)
2630 *spp
= s
->output_section
->next
;
2631 --output_bfd
->section_count
;
2635 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2636 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2637 if (s
->contents
== NULL
)
2640 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2644 /* Set the size of the .dynsym and .hash sections. We counted
2645 the number of dynamic symbols in elf_link_add_object_symbols.
2646 We will build the contents of .dynsym and .hash when we build
2647 the final symbol table, because until then we do not know the
2648 correct value to give the symbols. We built the .dynstr
2649 section as we went along in elf_link_add_object_symbols. */
2650 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2651 BFD_ASSERT (s
!= NULL
);
2652 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2653 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2654 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2657 /* The first entry in .dynsym is a dummy symbol. */
2664 elf_swap_symbol_out (output_bfd
, &isym
,
2665 (PTR
) (Elf_External_Sym
*) s
->contents
);
2667 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2669 bucketcount
= elf_buckets
[i
];
2670 if (dynsymcount
< elf_buckets
[i
+ 1])
2674 s
= bfd_get_section_by_name (dynobj
, ".hash");
2675 BFD_ASSERT (s
!= NULL
);
2676 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2677 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2678 if (s
->contents
== NULL
)
2680 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2682 put_word (output_bfd
, bucketcount
, s
->contents
);
2683 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2685 elf_hash_table (info
)->bucketcount
= bucketcount
;
2687 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2688 BFD_ASSERT (s
!= NULL
);
2689 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2691 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2698 /* Fix up the flags for a symbol. This handles various cases which
2699 can only be fixed after all the input files are seen. This is
2700 currently called by both adjust_dynamic_symbol and
2701 assign_sym_version, which is unnecessary but perhaps more robust in
2702 the face of future changes. */
2705 elf_fix_symbol_flags (h
, eif
)
2706 struct elf_link_hash_entry
*h
;
2707 struct elf_info_failed
*eif
;
2709 /* If this symbol was mentioned in a non-ELF file, try to set
2710 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2711 permit a non-ELF file to correctly refer to a symbol defined in
2712 an ELF dynamic object. */
2713 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2715 if (h
->root
.type
!= bfd_link_hash_defined
2716 && h
->root
.type
!= bfd_link_hash_defweak
)
2717 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2720 if (h
->root
.u
.def
.section
->owner
!= NULL
2721 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2722 == bfd_target_elf_flavour
))
2723 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2725 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2728 if (h
->dynindx
== -1
2729 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2730 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2732 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2740 /* If this is a final link, and the symbol was defined as a common
2741 symbol in a regular object file, and there was no definition in
2742 any dynamic object, then the linker will have allocated space for
2743 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2744 flag will not have been set. */
2745 if (h
->root
.type
== bfd_link_hash_defined
2746 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2747 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2748 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2749 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2750 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2752 /* If -Bsymbolic was used (which means to bind references to global
2753 symbols to the definition within the shared object), and this
2754 symbol was defined in a regular object, then it actually doesn't
2755 need a PLT entry. */
2756 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2757 && eif
->info
->shared
2758 && eif
->info
->symbolic
2759 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2760 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2765 /* Make the backend pick a good value for a dynamic symbol. This is
2766 called via elf_link_hash_traverse, and also calls itself
2770 elf_adjust_dynamic_symbol (h
, data
)
2771 struct elf_link_hash_entry
*h
;
2774 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2776 struct elf_backend_data
*bed
;
2778 /* Ignore indirect symbols. These are added by the versioning code. */
2779 if (h
->root
.type
== bfd_link_hash_indirect
)
2782 /* Fix the symbol flags. */
2783 if (! elf_fix_symbol_flags (h
, eif
))
2786 /* If this symbol does not require a PLT entry, and it is not
2787 defined by a dynamic object, or is not referenced by a regular
2788 object, ignore it. We do have to handle a weak defined symbol,
2789 even if no regular object refers to it, if we decided to add it
2790 to the dynamic symbol table. FIXME: Do we normally need to worry
2791 about symbols which are defined by one dynamic object and
2792 referenced by another one? */
2793 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2794 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2795 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2796 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2797 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2800 /* If we've already adjusted this symbol, don't do it again. This
2801 can happen via a recursive call. */
2802 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2805 /* Don't look at this symbol again. Note that we must set this
2806 after checking the above conditions, because we may look at a
2807 symbol once, decide not to do anything, and then get called
2808 recursively later after REF_REGULAR is set below. */
2809 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2811 /* If this is a weak definition, and we know a real definition, and
2812 the real symbol is not itself defined by a regular object file,
2813 then get a good value for the real definition. We handle the
2814 real symbol first, for the convenience of the backend routine.
2816 Note that there is a confusing case here. If the real definition
2817 is defined by a regular object file, we don't get the real symbol
2818 from the dynamic object, but we do get the weak symbol. If the
2819 processor backend uses a COPY reloc, then if some routine in the
2820 dynamic object changes the real symbol, we will not see that
2821 change in the corresponding weak symbol. This is the way other
2822 ELF linkers work as well, and seems to be a result of the shared
2825 I will clarify this issue. Most SVR4 shared libraries define the
2826 variable _timezone and define timezone as a weak synonym. The
2827 tzset call changes _timezone. If you write
2828 extern int timezone;
2830 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2831 you might expect that, since timezone is a synonym for _timezone,
2832 the same number will print both times. However, if the processor
2833 backend uses a COPY reloc, then actually timezone will be copied
2834 into your process image, and, since you define _timezone
2835 yourself, _timezone will not. Thus timezone and _timezone will
2836 wind up at different memory locations. The tzset call will set
2837 _timezone, leaving timezone unchanged. */
2839 if (h
->weakdef
!= NULL
)
2841 struct elf_link_hash_entry
*weakdef
;
2843 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2844 || h
->root
.type
== bfd_link_hash_defweak
);
2845 weakdef
= h
->weakdef
;
2846 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2847 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2848 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2849 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2851 /* This symbol is defined by a regular object file, so we
2852 will not do anything special. Clear weakdef for the
2853 convenience of the processor backend. */
2858 /* There is an implicit reference by a regular object file
2859 via the weak symbol. */
2860 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2861 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2866 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2867 bed
= get_elf_backend_data (dynobj
);
2868 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2877 /* This routine is used to export all defined symbols into the dynamic
2878 symbol table. It is called via elf_link_hash_traverse. */
2881 elf_export_symbol (h
, data
)
2882 struct elf_link_hash_entry
*h
;
2885 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2887 /* Ignore indirect symbols. These are added by the versioning code. */
2888 if (h
->root
.type
== bfd_link_hash_indirect
)
2891 if (h
->dynindx
== -1
2892 && (h
->elf_link_hash_flags
2893 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2895 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2905 /* Look through the symbols which are defined in other shared
2906 libraries and referenced here. Update the list of version
2907 dependencies. This will be put into the .gnu.version_r section.
2908 This function is called via elf_link_hash_traverse. */
2911 elf_link_find_version_dependencies (h
, data
)
2912 struct elf_link_hash_entry
*h
;
2915 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2916 Elf_Internal_Verneed
*t
;
2917 Elf_Internal_Vernaux
*a
;
2919 /* We only care about symbols defined in shared objects with version
2921 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2922 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2924 || h
->verinfo
.verdef
== NULL
)
2927 /* See if we already know about this version. */
2928 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2930 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2933 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2934 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2940 /* This is a new version. Add it to tree we are building. */
2944 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
2947 rinfo
->failed
= true;
2951 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2952 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
2953 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
2956 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
2958 /* Note that we are copying a string pointer here, and testing it
2959 above. If bfd_elf_string_from_elf_section is ever changed to
2960 discard the string data when low in memory, this will have to be
2962 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2964 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2965 a
->vna_nextptr
= t
->vn_auxptr
;
2967 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2970 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2977 /* Figure out appropriate versions for all the symbols. We may not
2978 have the version number script until we have read all of the input
2979 files, so until that point we don't know which symbols should be
2980 local. This function is called via elf_link_hash_traverse. */
2983 elf_link_assign_sym_version (h
, data
)
2984 struct elf_link_hash_entry
*h
;
2987 struct elf_assign_sym_version_info
*sinfo
=
2988 (struct elf_assign_sym_version_info
*) data
;
2989 struct bfd_link_info
*info
= sinfo
->info
;
2990 struct elf_info_failed eif
;
2993 /* Fix the symbol flags. */
2996 if (! elf_fix_symbol_flags (h
, &eif
))
2999 sinfo
->failed
= true;
3003 /* We only need version numbers for symbols defined in regular
3005 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3008 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3009 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3011 struct bfd_elf_version_tree
*t
;
3016 /* There are two consecutive ELF_VER_CHR characters if this is
3017 not a hidden symbol. */
3019 if (*p
== ELF_VER_CHR
)
3025 /* If there is no version string, we can just return out. */
3029 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3033 /* Look for the version. If we find it, it is no longer weak. */
3034 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3036 if (strcmp (t
->name
, p
) == 0)
3038 h
->verinfo
.vertree
= t
;
3041 /* See if there is anything to force this symbol to
3043 if (t
->locals
!= NULL
)
3047 struct bfd_elf_version_expr
*d
;
3049 len
= p
- h
->root
.root
.string
;
3050 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3053 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3054 alc
[len
- 1] = '\0';
3055 if (alc
[len
- 2] == ELF_VER_CHR
)
3056 alc
[len
- 2] = '\0';
3058 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3060 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3061 || fnmatch (d
->match
, alc
, 0) == 0)
3063 if (h
->dynindx
!= -1
3065 && ! sinfo
->export_dynamic
)
3067 sinfo
->removed_dynamic
= true;
3068 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3069 h
->elf_link_hash_flags
&=~
3070 ELF_LINK_HASH_NEEDS_PLT
;
3072 /* FIXME: The name of the symbol has
3073 already been recorded in the dynamic
3074 string table section. */
3081 bfd_release (sinfo
->output_bfd
, alc
);
3088 /* If we are building an application, we need to create a
3089 version node for this version. */
3090 if (t
== NULL
&& ! info
->shared
)
3092 struct bfd_elf_version_tree
**pp
;
3095 /* If we aren't going to export this symbol, we don't need
3096 to worry about it. */
3097 if (h
->dynindx
== -1)
3100 t
= ((struct bfd_elf_version_tree
*)
3101 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3104 sinfo
->failed
= true;
3113 t
->name_indx
= (unsigned int) -1;
3117 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3119 t
->vernum
= version_index
;
3123 h
->verinfo
.vertree
= t
;
3127 /* We could not find the version for a symbol when
3128 generating a shared archive. Return an error. */
3129 (*_bfd_error_handler
)
3130 ("%s: undefined version name %s",
3131 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3132 bfd_set_error (bfd_error_bad_value
);
3133 sinfo
->failed
= true;
3138 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3141 /* If we don't have a version for this symbol, see if we can find
3143 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3145 struct bfd_elf_version_tree
*t
;
3146 struct bfd_elf_version_tree
*deflt
;
3147 struct bfd_elf_version_expr
*d
;
3149 /* See if can find what version this symbol is in. If the
3150 symbol is supposed to be local, then don't actually register
3153 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3155 if (t
->globals
!= NULL
)
3157 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3159 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3161 h
->verinfo
.vertree
= t
;
3170 if (t
->locals
!= NULL
)
3172 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3174 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3176 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3178 h
->verinfo
.vertree
= t
;
3179 if (h
->dynindx
!= -1
3181 && ! sinfo
->export_dynamic
)
3183 sinfo
->removed_dynamic
= true;
3184 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3185 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3187 /* FIXME: The name of the symbol has already
3188 been recorded in the dynamic string table
3200 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3202 h
->verinfo
.vertree
= deflt
;
3203 if (h
->dynindx
!= -1
3205 && ! sinfo
->export_dynamic
)
3207 sinfo
->removed_dynamic
= true;
3208 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3209 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3211 /* FIXME: The name of the symbol has already been
3212 recorded in the dynamic string table section. */
3220 /* This function is used to renumber the dynamic symbols, if some of
3221 them are removed because they are marked as local. This is called
3222 via elf_link_hash_traverse. */
3225 elf_link_renumber_dynsyms (h
, data
)
3226 struct elf_link_hash_entry
*h
;
3229 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3231 if (h
->dynindx
!= -1)
3233 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3234 ++elf_hash_table (info
)->dynsymcount
;
3240 /* Final phase of ELF linker. */
3242 /* A structure we use to avoid passing large numbers of arguments. */
3244 struct elf_final_link_info
3246 /* General link information. */
3247 struct bfd_link_info
*info
;
3250 /* Symbol string table. */
3251 struct bfd_strtab_hash
*symstrtab
;
3252 /* .dynsym section. */
3253 asection
*dynsym_sec
;
3254 /* .hash section. */
3256 /* symbol version section (.gnu.version). */
3257 asection
*symver_sec
;
3258 /* Buffer large enough to hold contents of any section. */
3260 /* Buffer large enough to hold external relocs of any section. */
3261 PTR external_relocs
;
3262 /* Buffer large enough to hold internal relocs of any section. */
3263 Elf_Internal_Rela
*internal_relocs
;
3264 /* Buffer large enough to hold external local symbols of any input
3266 Elf_External_Sym
*external_syms
;
3267 /* Buffer large enough to hold internal local symbols of any input
3269 Elf_Internal_Sym
*internal_syms
;
3270 /* Array large enough to hold a symbol index for each local symbol
3271 of any input BFD. */
3273 /* Array large enough to hold a section pointer for each local
3274 symbol of any input BFD. */
3275 asection
**sections
;
3276 /* Buffer to hold swapped out symbols. */
3277 Elf_External_Sym
*symbuf
;
3278 /* Number of swapped out symbols in buffer. */
3279 size_t symbuf_count
;
3280 /* Number of symbols which fit in symbuf. */
3284 static boolean elf_link_output_sym
3285 PARAMS ((struct elf_final_link_info
*, const char *,
3286 Elf_Internal_Sym
*, asection
*));
3287 static boolean elf_link_flush_output_syms
3288 PARAMS ((struct elf_final_link_info
*));
3289 static boolean elf_link_output_extsym
3290 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3291 static boolean elf_link_input_bfd
3292 PARAMS ((struct elf_final_link_info
*, bfd
*));
3293 static boolean elf_reloc_link_order
3294 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3295 struct bfd_link_order
*));
3297 /* This struct is used to pass information to elf_link_output_extsym. */
3299 struct elf_outext_info
3303 struct elf_final_link_info
*finfo
;
3306 /* Do the final step of an ELF link. */
3309 elf_bfd_final_link (abfd
, info
)
3311 struct bfd_link_info
*info
;
3315 struct elf_final_link_info finfo
;
3316 register asection
*o
;
3317 register struct bfd_link_order
*p
;
3319 size_t max_contents_size
;
3320 size_t max_external_reloc_size
;
3321 size_t max_internal_reloc_count
;
3322 size_t max_sym_count
;
3324 Elf_Internal_Sym elfsym
;
3326 Elf_Internal_Shdr
*symtab_hdr
;
3327 Elf_Internal_Shdr
*symstrtab_hdr
;
3328 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3329 struct elf_outext_info eoinfo
;
3332 abfd
->flags
|= DYNAMIC
;
3334 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3335 dynobj
= elf_hash_table (info
)->dynobj
;
3338 finfo
.output_bfd
= abfd
;
3339 finfo
.symstrtab
= elf_stringtab_init ();
3340 if (finfo
.symstrtab
== NULL
)
3345 finfo
.dynsym_sec
= NULL
;
3346 finfo
.hash_sec
= NULL
;
3347 finfo
.symver_sec
= NULL
;
3351 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3352 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3353 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3354 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3355 /* Note that it is OK if symver_sec is NULL. */
3358 finfo
.contents
= NULL
;
3359 finfo
.external_relocs
= NULL
;
3360 finfo
.internal_relocs
= NULL
;
3361 finfo
.external_syms
= NULL
;
3362 finfo
.internal_syms
= NULL
;
3363 finfo
.indices
= NULL
;
3364 finfo
.sections
= NULL
;
3365 finfo
.symbuf
= NULL
;
3366 finfo
.symbuf_count
= 0;
3368 /* Count up the number of relocations we will output for each output
3369 section, so that we know the sizes of the reloc sections. We
3370 also figure out some maximum sizes. */
3371 max_contents_size
= 0;
3372 max_external_reloc_size
= 0;
3373 max_internal_reloc_count
= 0;
3375 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3379 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3381 if (p
->type
== bfd_section_reloc_link_order
3382 || p
->type
== bfd_symbol_reloc_link_order
)
3384 else if (p
->type
== bfd_indirect_link_order
)
3388 sec
= p
->u
.indirect
.section
;
3390 /* Mark all sections which are to be included in the
3391 link. This will normally be every section. We need
3392 to do this so that we can identify any sections which
3393 the linker has decided to not include. */
3394 sec
->linker_mark
= true;
3396 if (info
->relocateable
)
3397 o
->reloc_count
+= sec
->reloc_count
;
3399 if (sec
->_raw_size
> max_contents_size
)
3400 max_contents_size
= sec
->_raw_size
;
3401 if (sec
->_cooked_size
> max_contents_size
)
3402 max_contents_size
= sec
->_cooked_size
;
3404 /* We are interested in just local symbols, not all
3406 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3407 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3411 if (elf_bad_symtab (sec
->owner
))
3412 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3413 / sizeof (Elf_External_Sym
));
3415 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3417 if (sym_count
> max_sym_count
)
3418 max_sym_count
= sym_count
;
3420 if ((sec
->flags
& SEC_RELOC
) != 0)
3424 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3425 if (ext_size
> max_external_reloc_size
)
3426 max_external_reloc_size
= ext_size
;
3427 if (sec
->reloc_count
> max_internal_reloc_count
)
3428 max_internal_reloc_count
= sec
->reloc_count
;
3434 if (o
->reloc_count
> 0)
3435 o
->flags
|= SEC_RELOC
;
3438 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3439 set it (this is probably a bug) and if it is set
3440 assign_section_numbers will create a reloc section. */
3441 o
->flags
&=~ SEC_RELOC
;
3444 /* If the SEC_ALLOC flag is not set, force the section VMA to
3445 zero. This is done in elf_fake_sections as well, but forcing
3446 the VMA to 0 here will ensure that relocs against these
3447 sections are handled correctly. */
3448 if ((o
->flags
& SEC_ALLOC
) == 0
3449 && ! o
->user_set_vma
)
3453 /* Figure out the file positions for everything but the symbol table
3454 and the relocs. We set symcount to force assign_section_numbers
3455 to create a symbol table. */
3456 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3457 BFD_ASSERT (! abfd
->output_has_begun
);
3458 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3461 /* That created the reloc sections. Set their sizes, and assign
3462 them file positions, and allocate some buffers. */
3463 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3465 if ((o
->flags
& SEC_RELOC
) != 0)
3467 Elf_Internal_Shdr
*rel_hdr
;
3468 register struct elf_link_hash_entry
**p
, **pend
;
3470 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3472 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3474 /* The contents field must last into write_object_contents,
3475 so we allocate it with bfd_alloc rather than malloc. */
3476 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3477 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3480 p
= ((struct elf_link_hash_entry
**)
3481 bfd_malloc (o
->reloc_count
3482 * sizeof (struct elf_link_hash_entry
*)));
3483 if (p
== NULL
&& o
->reloc_count
!= 0)
3485 elf_section_data (o
)->rel_hashes
= p
;
3486 pend
= p
+ o
->reloc_count
;
3487 for (; p
< pend
; p
++)
3490 /* Use the reloc_count field as an index when outputting the
3496 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3498 /* We have now assigned file positions for all the sections except
3499 .symtab and .strtab. We start the .symtab section at the current
3500 file position, and write directly to it. We build the .strtab
3501 section in memory. */
3503 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3504 /* sh_name is set in prep_headers. */
3505 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3506 symtab_hdr
->sh_flags
= 0;
3507 symtab_hdr
->sh_addr
= 0;
3508 symtab_hdr
->sh_size
= 0;
3509 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3510 /* sh_link is set in assign_section_numbers. */
3511 /* sh_info is set below. */
3512 /* sh_offset is set just below. */
3513 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3515 off
= elf_tdata (abfd
)->next_file_pos
;
3516 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3518 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3519 incorrect. We do not yet know the size of the .symtab section.
3520 We correct next_file_pos below, after we do know the size. */
3522 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3523 continuously seeking to the right position in the file. */
3524 if (! info
->keep_memory
|| max_sym_count
< 20)
3525 finfo
.symbuf_size
= 20;
3527 finfo
.symbuf_size
= max_sym_count
;
3528 finfo
.symbuf
= ((Elf_External_Sym
*)
3529 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3530 if (finfo
.symbuf
== NULL
)
3533 /* Start writing out the symbol table. The first symbol is always a
3535 if (info
->strip
!= strip_all
|| info
->relocateable
)
3537 elfsym
.st_value
= 0;
3540 elfsym
.st_other
= 0;
3541 elfsym
.st_shndx
= SHN_UNDEF
;
3542 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3543 &elfsym
, bfd_und_section_ptr
))
3548 /* Some standard ELF linkers do this, but we don't because it causes
3549 bootstrap comparison failures. */
3550 /* Output a file symbol for the output file as the second symbol.
3551 We output this even if we are discarding local symbols, although
3552 I'm not sure if this is correct. */
3553 elfsym
.st_value
= 0;
3555 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3556 elfsym
.st_other
= 0;
3557 elfsym
.st_shndx
= SHN_ABS
;
3558 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3559 &elfsym
, bfd_abs_section_ptr
))
3563 /* Output a symbol for each section. We output these even if we are
3564 discarding local symbols, since they are used for relocs. These
3565 symbols have no names. We store the index of each one in the
3566 index field of the section, so that we can find it again when
3567 outputting relocs. */
3568 if (info
->strip
!= strip_all
|| info
->relocateable
)
3571 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3572 elfsym
.st_other
= 0;
3573 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3575 o
= section_from_elf_index (abfd
, i
);
3577 o
->target_index
= abfd
->symcount
;
3578 elfsym
.st_shndx
= i
;
3579 if (info
->relocateable
|| o
== NULL
)
3580 elfsym
.st_value
= 0;
3582 elfsym
.st_value
= o
->vma
;
3583 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3589 /* Allocate some memory to hold information read in from the input
3591 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3592 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3593 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3594 bfd_malloc (max_internal_reloc_count
3595 * sizeof (Elf_Internal_Rela
)));
3596 finfo
.external_syms
= ((Elf_External_Sym
*)
3597 bfd_malloc (max_sym_count
3598 * sizeof (Elf_External_Sym
)));
3599 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3600 bfd_malloc (max_sym_count
3601 * sizeof (Elf_Internal_Sym
)));
3602 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3603 finfo
.sections
= ((asection
**)
3604 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3605 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3606 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3607 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3608 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3609 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3610 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3611 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3614 /* Since ELF permits relocations to be against local symbols, we
3615 must have the local symbols available when we do the relocations.
3616 Since we would rather only read the local symbols once, and we
3617 would rather not keep them in memory, we handle all the
3618 relocations for a single input file at the same time.
3620 Unfortunately, there is no way to know the total number of local
3621 symbols until we have seen all of them, and the local symbol
3622 indices precede the global symbol indices. This means that when
3623 we are generating relocateable output, and we see a reloc against
3624 a global symbol, we can not know the symbol index until we have
3625 finished examining all the local symbols to see which ones we are
3626 going to output. To deal with this, we keep the relocations in
3627 memory, and don't output them until the end of the link. This is
3628 an unfortunate waste of memory, but I don't see a good way around
3629 it. Fortunately, it only happens when performing a relocateable
3630 link, which is not the common case. FIXME: If keep_memory is set
3631 we could write the relocs out and then read them again; I don't
3632 know how bad the memory loss will be. */
3634 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3635 sub
->output_has_begun
= false;
3636 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3638 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3640 if (p
->type
== bfd_indirect_link_order
3641 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3642 == bfd_target_elf_flavour
))
3644 sub
= p
->u
.indirect
.section
->owner
;
3645 if (! sub
->output_has_begun
)
3647 if (! elf_link_input_bfd (&finfo
, sub
))
3649 sub
->output_has_begun
= true;
3652 else if (p
->type
== bfd_section_reloc_link_order
3653 || p
->type
== bfd_symbol_reloc_link_order
)
3655 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3660 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3666 /* That wrote out all the local symbols. Finish up the symbol table
3667 with the global symbols. */
3669 if (info
->strip
!= strip_all
&& info
->shared
)
3671 /* Output any global symbols that got converted to local in a
3672 version script. We do this in a separate step since ELF
3673 requires all local symbols to appear prior to any global
3674 symbols. FIXME: We should only do this if some global
3675 symbols were, in fact, converted to become local. FIXME:
3676 Will this work correctly with the Irix 5 linker? */
3677 eoinfo
.failed
= false;
3678 eoinfo
.finfo
= &finfo
;
3679 eoinfo
.localsyms
= true;
3680 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3686 /* The sh_info field records the index of the first non local
3688 symtab_hdr
->sh_info
= abfd
->symcount
;
3690 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3692 /* We get the global symbols from the hash table. */
3693 eoinfo
.failed
= false;
3694 eoinfo
.localsyms
= false;
3695 eoinfo
.finfo
= &finfo
;
3696 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3701 /* Flush all symbols to the file. */
3702 if (! elf_link_flush_output_syms (&finfo
))
3705 /* Now we know the size of the symtab section. */
3706 off
+= symtab_hdr
->sh_size
;
3708 /* Finish up and write out the symbol string table (.strtab)
3710 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3711 /* sh_name was set in prep_headers. */
3712 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3713 symstrtab_hdr
->sh_flags
= 0;
3714 symstrtab_hdr
->sh_addr
= 0;
3715 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3716 symstrtab_hdr
->sh_entsize
= 0;
3717 symstrtab_hdr
->sh_link
= 0;
3718 symstrtab_hdr
->sh_info
= 0;
3719 /* sh_offset is set just below. */
3720 symstrtab_hdr
->sh_addralign
= 1;
3722 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3723 elf_tdata (abfd
)->next_file_pos
= off
;
3725 if (abfd
->symcount
> 0)
3727 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3728 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3732 /* Adjust the relocs to have the correct symbol indices. */
3733 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3735 struct elf_link_hash_entry
**rel_hash
;
3736 Elf_Internal_Shdr
*rel_hdr
;
3738 if ((o
->flags
& SEC_RELOC
) == 0)
3741 rel_hash
= elf_section_data (o
)->rel_hashes
;
3742 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3743 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3745 if (*rel_hash
== NULL
)
3748 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3750 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3752 Elf_External_Rel
*erel
;
3753 Elf_Internal_Rel irel
;
3755 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3756 elf_swap_reloc_in (abfd
, erel
, &irel
);
3757 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3758 ELF_R_TYPE (irel
.r_info
));
3759 elf_swap_reloc_out (abfd
, &irel
, erel
);
3763 Elf_External_Rela
*erela
;
3764 Elf_Internal_Rela irela
;
3766 BFD_ASSERT (rel_hdr
->sh_entsize
3767 == sizeof (Elf_External_Rela
));
3769 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3770 elf_swap_reloca_in (abfd
, erela
, &irela
);
3771 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3772 ELF_R_TYPE (irela
.r_info
));
3773 elf_swap_reloca_out (abfd
, &irela
, erela
);
3777 /* Set the reloc_count field to 0 to prevent write_relocs from
3778 trying to swap the relocs out itself. */
3782 /* If we are linking against a dynamic object, or generating a
3783 shared library, finish up the dynamic linking information. */
3786 Elf_External_Dyn
*dyncon
, *dynconend
;
3788 /* Fix up .dynamic entries. */
3789 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3790 BFD_ASSERT (o
!= NULL
);
3792 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3793 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3794 for (; dyncon
< dynconend
; dyncon
++)
3796 Elf_Internal_Dyn dyn
;
3800 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3807 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3808 magic _init and _fini symbols. This is pretty ugly,
3809 but we are compatible. */
3817 struct elf_link_hash_entry
*h
;
3819 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3820 false, false, true);
3822 && (h
->root
.type
== bfd_link_hash_defined
3823 || h
->root
.type
== bfd_link_hash_defweak
))
3825 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3826 o
= h
->root
.u
.def
.section
;
3827 if (o
->output_section
!= NULL
)
3828 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3829 + o
->output_offset
);
3832 /* The symbol is imported from another shared
3833 library and does not apply to this one. */
3837 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3852 name
= ".gnu.version_d";
3855 name
= ".gnu.version_r";
3858 name
= ".gnu.version";
3860 o
= bfd_get_section_by_name (abfd
, name
);
3861 BFD_ASSERT (o
!= NULL
);
3862 dyn
.d_un
.d_ptr
= o
->vma
;
3863 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3870 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3875 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3877 Elf_Internal_Shdr
*hdr
;
3879 hdr
= elf_elfsections (abfd
)[i
];
3880 if (hdr
->sh_type
== type
3881 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3883 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3884 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3887 if (dyn
.d_un
.d_val
== 0
3888 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3889 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3893 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3899 /* If we have created any dynamic sections, then output them. */
3902 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3905 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3907 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3908 || o
->_raw_size
== 0)
3910 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3912 /* At this point, we are only interested in sections
3913 created by elf_link_create_dynamic_sections. */
3916 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3918 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3920 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3921 o
->contents
, o
->output_offset
,
3929 /* The contents of the .dynstr section are actually in a
3931 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3932 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3933 || ! _bfd_stringtab_emit (abfd
,
3934 elf_hash_table (info
)->dynstr
))
3940 /* If we have optimized stabs strings, output them. */
3941 if (elf_hash_table (info
)->stab_info
!= NULL
)
3943 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
3947 if (finfo
.symstrtab
!= NULL
)
3948 _bfd_stringtab_free (finfo
.symstrtab
);
3949 if (finfo
.contents
!= NULL
)
3950 free (finfo
.contents
);
3951 if (finfo
.external_relocs
!= NULL
)
3952 free (finfo
.external_relocs
);
3953 if (finfo
.internal_relocs
!= NULL
)
3954 free (finfo
.internal_relocs
);
3955 if (finfo
.external_syms
!= NULL
)
3956 free (finfo
.external_syms
);
3957 if (finfo
.internal_syms
!= NULL
)
3958 free (finfo
.internal_syms
);
3959 if (finfo
.indices
!= NULL
)
3960 free (finfo
.indices
);
3961 if (finfo
.sections
!= NULL
)
3962 free (finfo
.sections
);
3963 if (finfo
.symbuf
!= NULL
)
3964 free (finfo
.symbuf
);
3965 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3967 if ((o
->flags
& SEC_RELOC
) != 0
3968 && elf_section_data (o
)->rel_hashes
!= NULL
)
3969 free (elf_section_data (o
)->rel_hashes
);
3972 elf_tdata (abfd
)->linker
= true;
3977 if (finfo
.symstrtab
!= NULL
)
3978 _bfd_stringtab_free (finfo
.symstrtab
);
3979 if (finfo
.contents
!= NULL
)
3980 free (finfo
.contents
);
3981 if (finfo
.external_relocs
!= NULL
)
3982 free (finfo
.external_relocs
);
3983 if (finfo
.internal_relocs
!= NULL
)
3984 free (finfo
.internal_relocs
);
3985 if (finfo
.external_syms
!= NULL
)
3986 free (finfo
.external_syms
);
3987 if (finfo
.internal_syms
!= NULL
)
3988 free (finfo
.internal_syms
);
3989 if (finfo
.indices
!= NULL
)
3990 free (finfo
.indices
);
3991 if (finfo
.sections
!= NULL
)
3992 free (finfo
.sections
);
3993 if (finfo
.symbuf
!= NULL
)
3994 free (finfo
.symbuf
);
3995 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3997 if ((o
->flags
& SEC_RELOC
) != 0
3998 && elf_section_data (o
)->rel_hashes
!= NULL
)
3999 free (elf_section_data (o
)->rel_hashes
);
4005 /* Add a symbol to the output symbol table. */
4008 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4009 struct elf_final_link_info
*finfo
;
4011 Elf_Internal_Sym
*elfsym
;
4012 asection
*input_sec
;
4014 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4015 struct bfd_link_info
*info
,
4020 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4021 elf_backend_link_output_symbol_hook
;
4022 if (output_symbol_hook
!= NULL
)
4024 if (! ((*output_symbol_hook
)
4025 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4029 if (name
== (const char *) NULL
|| *name
== '\0')
4030 elfsym
->st_name
= 0;
4033 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4036 if (elfsym
->st_name
== (unsigned long) -1)
4040 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4042 if (! elf_link_flush_output_syms (finfo
))
4046 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4047 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4048 ++finfo
->symbuf_count
;
4050 ++finfo
->output_bfd
->symcount
;
4055 /* Flush the output symbols to the file. */
4058 elf_link_flush_output_syms (finfo
)
4059 struct elf_final_link_info
*finfo
;
4061 if (finfo
->symbuf_count
> 0)
4063 Elf_Internal_Shdr
*symtab
;
4065 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4067 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4069 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4070 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4071 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4074 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4076 finfo
->symbuf_count
= 0;
4082 /* Add an external symbol to the symbol table. This is called from
4083 the hash table traversal routine. When generating a shared object,
4084 we go through the symbol table twice. The first time we output
4085 anything that might have been forced to local scope in a version
4086 script. The second time we output the symbols that are still
4090 elf_link_output_extsym (h
, data
)
4091 struct elf_link_hash_entry
*h
;
4094 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4095 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4097 Elf_Internal_Sym sym
;
4098 asection
*input_sec
;
4100 /* Decide whether to output this symbol in this pass. */
4101 if (eoinfo
->localsyms
)
4103 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4108 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4112 /* If we are not creating a shared library, and this symbol is
4113 referenced by a shared library but is not defined anywhere, then
4114 warn that it is undefined. If we do not do this, the runtime
4115 linker will complain that the symbol is undefined when the
4116 program is run. We don't have to worry about symbols that are
4117 referenced by regular files, because we will already have issued
4118 warnings for them. */
4119 if (! finfo
->info
->relocateable
4120 && ! finfo
->info
->shared
4121 && h
->root
.type
== bfd_link_hash_undefined
4122 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4123 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4125 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4126 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4127 (asection
*) NULL
, 0)))
4129 eoinfo
->failed
= true;
4134 /* We don't want to output symbols that have never been mentioned by
4135 a regular file, or that we have been told to strip. However, if
4136 h->indx is set to -2, the symbol is used by a reloc and we must
4140 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4141 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4142 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4143 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4145 else if (finfo
->info
->strip
== strip_all
4146 || (finfo
->info
->strip
== strip_some
4147 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4148 h
->root
.root
.string
,
4149 false, false) == NULL
))
4154 /* If we're stripping it, and it's not a dynamic symbol, there's
4155 nothing else to do. */
4156 if (strip
&& h
->dynindx
== -1)
4160 sym
.st_size
= h
->size
;
4161 sym
.st_other
= h
->other
;
4162 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4163 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4164 else if (h
->root
.type
== bfd_link_hash_undefweak
4165 || h
->root
.type
== bfd_link_hash_defweak
)
4166 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4168 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4170 switch (h
->root
.type
)
4173 case bfd_link_hash_new
:
4177 case bfd_link_hash_undefined
:
4178 input_sec
= bfd_und_section_ptr
;
4179 sym
.st_shndx
= SHN_UNDEF
;
4182 case bfd_link_hash_undefweak
:
4183 input_sec
= bfd_und_section_ptr
;
4184 sym
.st_shndx
= SHN_UNDEF
;
4187 case bfd_link_hash_defined
:
4188 case bfd_link_hash_defweak
:
4190 input_sec
= h
->root
.u
.def
.section
;
4191 if (input_sec
->output_section
!= NULL
)
4194 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4195 input_sec
->output_section
);
4196 if (sym
.st_shndx
== (unsigned short) -1)
4198 eoinfo
->failed
= true;
4202 /* ELF symbols in relocateable files are section relative,
4203 but in nonrelocateable files they are virtual
4205 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4206 if (! finfo
->info
->relocateable
)
4207 sym
.st_value
+= input_sec
->output_section
->vma
;
4211 BFD_ASSERT (input_sec
->owner
== NULL
4212 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4213 sym
.st_shndx
= SHN_UNDEF
;
4214 input_sec
= bfd_und_section_ptr
;
4219 case bfd_link_hash_common
:
4220 input_sec
= bfd_com_section_ptr
;
4221 sym
.st_shndx
= SHN_COMMON
;
4222 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4225 case bfd_link_hash_indirect
:
4226 /* These symbols are created by symbol versioning. They point
4227 to the decorated version of the name. For example, if the
4228 symbol foo@@GNU_1.2 is the default, which should be used when
4229 foo is used with no version, then we add an indirect symbol
4230 foo which points to foo@@GNU_1.2. We ignore these symbols,
4231 since the indirected symbol is already in the hash table. If
4232 the indirect symbol is non-ELF, fall through and output it. */
4233 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4237 case bfd_link_hash_warning
:
4238 /* We can't represent these symbols in ELF, although a warning
4239 symbol may have come from a .gnu.warning.SYMBOL section. We
4240 just put the target symbol in the hash table. If the target
4241 symbol does not really exist, don't do anything. */
4242 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4244 return (elf_link_output_extsym
4245 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4248 /* Give the processor backend a chance to tweak the symbol value,
4249 and also to finish up anything that needs to be done for this
4251 if ((h
->dynindx
!= -1
4252 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4253 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4255 struct elf_backend_data
*bed
;
4257 bed
= get_elf_backend_data (finfo
->output_bfd
);
4258 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4259 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4261 eoinfo
->failed
= true;
4266 /* If this symbol should be put in the .dynsym section, then put it
4267 there now. We have already know the symbol index. We also fill
4268 in the entry in the .hash section. */
4269 if (h
->dynindx
!= -1
4270 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4276 bfd_byte
*bucketpos
;
4279 sym
.st_name
= h
->dynstr_index
;
4281 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4282 (PTR
) (((Elf_External_Sym
*)
4283 finfo
->dynsym_sec
->contents
)
4286 /* We didn't include the version string in the dynamic string
4287 table, so we must not consider it in the hash table. */
4288 name
= h
->root
.root
.string
;
4289 p
= strchr (name
, ELF_VER_CHR
);
4294 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4295 strncpy (copy
, name
, p
- name
);
4296 copy
[p
- name
] = '\0';
4300 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4301 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4302 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4303 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4304 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4305 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4306 put_word (finfo
->output_bfd
, chain
,
4307 ((bfd_byte
*) finfo
->hash_sec
->contents
4308 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4311 bfd_release (finfo
->output_bfd
, copy
);
4313 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4315 Elf_Internal_Versym iversym
;
4317 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4319 if (h
->verinfo
.verdef
== NULL
)
4320 iversym
.vs_vers
= 0;
4322 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4326 if (h
->verinfo
.vertree
== NULL
)
4327 iversym
.vs_vers
= 1;
4329 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4332 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4333 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4335 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4336 (((Elf_External_Versym
*)
4337 finfo
->symver_sec
->contents
)
4342 /* If we're stripping it, then it was just a dynamic symbol, and
4343 there's nothing else to do. */
4347 h
->indx
= finfo
->output_bfd
->symcount
;
4349 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4351 eoinfo
->failed
= true;
4358 /* Link an input file into the linker output file. This function
4359 handles all the sections and relocations of the input file at once.
4360 This is so that we only have to read the local symbols once, and
4361 don't have to keep them in memory. */
4364 elf_link_input_bfd (finfo
, input_bfd
)
4365 struct elf_final_link_info
*finfo
;
4368 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4369 bfd
*, asection
*, bfd_byte
*,
4370 Elf_Internal_Rela
*,
4371 Elf_Internal_Sym
*, asection
**));
4373 Elf_Internal_Shdr
*symtab_hdr
;
4376 Elf_External_Sym
*external_syms
;
4377 Elf_External_Sym
*esym
;
4378 Elf_External_Sym
*esymend
;
4379 Elf_Internal_Sym
*isym
;
4381 asection
**ppsection
;
4384 output_bfd
= finfo
->output_bfd
;
4386 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4388 /* If this is a dynamic object, we don't want to do anything here:
4389 we don't want the local symbols, and we don't want the section
4391 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4394 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4395 if (elf_bad_symtab (input_bfd
))
4397 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4402 locsymcount
= symtab_hdr
->sh_info
;
4403 extsymoff
= symtab_hdr
->sh_info
;
4406 /* Read the local symbols. */
4407 if (symtab_hdr
->contents
!= NULL
)
4408 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4409 else if (locsymcount
== 0)
4410 external_syms
= NULL
;
4413 external_syms
= finfo
->external_syms
;
4414 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4415 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4416 locsymcount
, input_bfd
)
4417 != locsymcount
* sizeof (Elf_External_Sym
)))
4421 /* Swap in the local symbols and write out the ones which we know
4422 are going into the output file. */
4423 esym
= external_syms
;
4424 esymend
= esym
+ locsymcount
;
4425 isym
= finfo
->internal_syms
;
4426 pindex
= finfo
->indices
;
4427 ppsection
= finfo
->sections
;
4428 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4432 Elf_Internal_Sym osym
;
4434 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4437 if (elf_bad_symtab (input_bfd
))
4439 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4446 if (isym
->st_shndx
== SHN_UNDEF
)
4447 isec
= bfd_und_section_ptr
;
4448 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4449 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4450 else if (isym
->st_shndx
== SHN_ABS
)
4451 isec
= bfd_abs_section_ptr
;
4452 else if (isym
->st_shndx
== SHN_COMMON
)
4453 isec
= bfd_com_section_ptr
;
4462 /* Don't output the first, undefined, symbol. */
4463 if (esym
== external_syms
)
4466 /* If we are stripping all symbols, we don't want to output this
4468 if (finfo
->info
->strip
== strip_all
)
4471 /* We never output section symbols. Instead, we use the section
4472 symbol of the corresponding section in the output file. */
4473 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4476 /* If we are discarding all local symbols, we don't want to
4477 output this one. If we are generating a relocateable output
4478 file, then some of the local symbols may be required by
4479 relocs; we output them below as we discover that they are
4481 if (finfo
->info
->discard
== discard_all
)
4484 /* If this symbol is defined in a section which we are
4485 discarding, we don't need to keep it, but note that
4486 linker_mark is only reliable for sections that have contents.
4487 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4488 as well as linker_mark. */
4489 if (isym
->st_shndx
> 0
4490 && isym
->st_shndx
< SHN_LORESERVE
4492 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4493 || (! finfo
->info
->relocateable
4494 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4497 /* Get the name of the symbol. */
4498 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4503 /* See if we are discarding symbols with this name. */
4504 if ((finfo
->info
->strip
== strip_some
4505 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4507 || (finfo
->info
->discard
== discard_l
4508 && bfd_is_local_label_name (input_bfd
, name
)))
4511 /* If we get here, we are going to output this symbol. */
4515 /* Adjust the section index for the output file. */
4516 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4517 isec
->output_section
);
4518 if (osym
.st_shndx
== (unsigned short) -1)
4521 *pindex
= output_bfd
->symcount
;
4523 /* ELF symbols in relocateable files are section relative, but
4524 in executable files they are virtual addresses. Note that
4525 this code assumes that all ELF sections have an associated
4526 BFD section with a reasonable value for output_offset; below
4527 we assume that they also have a reasonable value for
4528 output_section. Any special sections must be set up to meet
4529 these requirements. */
4530 osym
.st_value
+= isec
->output_offset
;
4531 if (! finfo
->info
->relocateable
)
4532 osym
.st_value
+= isec
->output_section
->vma
;
4534 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4538 /* Relocate the contents of each section. */
4539 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4543 if (! o
->linker_mark
)
4545 /* This section was omitted from the link. */
4549 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4550 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4553 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4555 /* Section was created by elf_link_create_dynamic_sections
4560 /* Get the contents of the section. They have been cached by a
4561 relaxation routine. Note that o is a section in an input
4562 file, so the contents field will not have been set by any of
4563 the routines which work on output files. */
4564 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4565 contents
= elf_section_data (o
)->this_hdr
.contents
;
4568 contents
= finfo
->contents
;
4569 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4570 (file_ptr
) 0, o
->_raw_size
))
4574 if ((o
->flags
& SEC_RELOC
) != 0)
4576 Elf_Internal_Rela
*internal_relocs
;
4578 /* Get the swapped relocs. */
4579 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4580 (input_bfd
, o
, finfo
->external_relocs
,
4581 finfo
->internal_relocs
, false));
4582 if (internal_relocs
== NULL
4583 && o
->reloc_count
> 0)
4586 /* Relocate the section by invoking a back end routine.
4588 The back end routine is responsible for adjusting the
4589 section contents as necessary, and (if using Rela relocs
4590 and generating a relocateable output file) adjusting the
4591 reloc addend as necessary.
4593 The back end routine does not have to worry about setting
4594 the reloc address or the reloc symbol index.
4596 The back end routine is given a pointer to the swapped in
4597 internal symbols, and can access the hash table entries
4598 for the external symbols via elf_sym_hashes (input_bfd).
4600 When generating relocateable output, the back end routine
4601 must handle STB_LOCAL/STT_SECTION symbols specially. The
4602 output symbol is going to be a section symbol
4603 corresponding to the output section, which will require
4604 the addend to be adjusted. */
4606 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4607 input_bfd
, o
, contents
,
4609 finfo
->internal_syms
,
4613 if (finfo
->info
->relocateable
)
4615 Elf_Internal_Rela
*irela
;
4616 Elf_Internal_Rela
*irelaend
;
4617 struct elf_link_hash_entry
**rel_hash
;
4618 Elf_Internal_Shdr
*input_rel_hdr
;
4619 Elf_Internal_Shdr
*output_rel_hdr
;
4621 /* Adjust the reloc addresses and symbol indices. */
4623 irela
= internal_relocs
;
4624 irelaend
= irela
+ o
->reloc_count
;
4625 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4626 + o
->output_section
->reloc_count
);
4627 for (; irela
< irelaend
; irela
++, rel_hash
++)
4629 unsigned long r_symndx
;
4630 Elf_Internal_Sym
*isym
;
4633 irela
->r_offset
+= o
->output_offset
;
4635 r_symndx
= ELF_R_SYM (irela
->r_info
);
4640 if (r_symndx
>= locsymcount
4641 || (elf_bad_symtab (input_bfd
)
4642 && finfo
->sections
[r_symndx
] == NULL
))
4646 /* This is a reloc against a global symbol. We
4647 have not yet output all the local symbols, so
4648 we do not know the symbol index of any global
4649 symbol. We set the rel_hash entry for this
4650 reloc to point to the global hash table entry
4651 for this symbol. The symbol index is then
4652 set at the end of elf_bfd_final_link. */
4653 indx
= r_symndx
- extsymoff
;
4654 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4656 /* Setting the index to -2 tells
4657 elf_link_output_extsym that this symbol is
4659 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4660 (*rel_hash
)->indx
= -2;
4665 /* This is a reloc against a local symbol. */
4668 isym
= finfo
->internal_syms
+ r_symndx
;
4669 sec
= finfo
->sections
[r_symndx
];
4670 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4672 /* I suppose the backend ought to fill in the
4673 section of any STT_SECTION symbol against a
4674 processor specific section. If we have
4675 discarded a section, the output_section will
4676 be the absolute section. */
4678 && (bfd_is_abs_section (sec
)
4679 || (sec
->output_section
!= NULL
4680 && bfd_is_abs_section (sec
->output_section
))))
4682 else if (sec
== NULL
|| sec
->owner
== NULL
)
4684 bfd_set_error (bfd_error_bad_value
);
4689 r_symndx
= sec
->output_section
->target_index
;
4690 BFD_ASSERT (r_symndx
!= 0);
4695 if (finfo
->indices
[r_symndx
] == -1)
4701 if (finfo
->info
->strip
== strip_all
)
4703 /* You can't do ld -r -s. */
4704 bfd_set_error (bfd_error_invalid_operation
);
4708 /* This symbol was skipped earlier, but
4709 since it is needed by a reloc, we
4710 must output it now. */
4711 link
= symtab_hdr
->sh_link
;
4712 name
= bfd_elf_string_from_elf_section (input_bfd
,
4718 osec
= sec
->output_section
;
4720 _bfd_elf_section_from_bfd_section (output_bfd
,
4722 if (isym
->st_shndx
== (unsigned short) -1)
4725 isym
->st_value
+= sec
->output_offset
;
4726 if (! finfo
->info
->relocateable
)
4727 isym
->st_value
+= osec
->vma
;
4729 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4731 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4735 r_symndx
= finfo
->indices
[r_symndx
];
4738 irela
->r_info
= ELF_R_INFO (r_symndx
,
4739 ELF_R_TYPE (irela
->r_info
));
4742 /* Swap out the relocs. */
4743 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4744 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4745 BFD_ASSERT (output_rel_hdr
->sh_entsize
4746 == input_rel_hdr
->sh_entsize
);
4747 irela
= internal_relocs
;
4748 irelaend
= irela
+ o
->reloc_count
;
4749 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4751 Elf_External_Rel
*erel
;
4753 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4754 + o
->output_section
->reloc_count
);
4755 for (; irela
< irelaend
; irela
++, erel
++)
4757 Elf_Internal_Rel irel
;
4759 irel
.r_offset
= irela
->r_offset
;
4760 irel
.r_info
= irela
->r_info
;
4761 BFD_ASSERT (irela
->r_addend
== 0);
4762 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4767 Elf_External_Rela
*erela
;
4769 BFD_ASSERT (input_rel_hdr
->sh_entsize
4770 == sizeof (Elf_External_Rela
));
4771 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4772 + o
->output_section
->reloc_count
);
4773 for (; irela
< irelaend
; irela
++, erela
++)
4774 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4777 o
->output_section
->reloc_count
+= o
->reloc_count
;
4781 /* Write out the modified section contents. */
4782 if (elf_section_data (o
)->stab_info
== NULL
)
4784 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4785 contents
, o
->output_offset
,
4786 (o
->_cooked_size
!= 0
4793 if (! (_bfd_write_section_stabs
4794 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4795 o
, &elf_section_data (o
)->stab_info
, contents
)))
4803 /* Generate a reloc when linking an ELF file. This is a reloc
4804 requested by the linker, and does come from any input file. This
4805 is used to build constructor and destructor tables when linking
4809 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4811 struct bfd_link_info
*info
;
4812 asection
*output_section
;
4813 struct bfd_link_order
*link_order
;
4815 reloc_howto_type
*howto
;
4819 struct elf_link_hash_entry
**rel_hash_ptr
;
4820 Elf_Internal_Shdr
*rel_hdr
;
4822 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4825 bfd_set_error (bfd_error_bad_value
);
4829 addend
= link_order
->u
.reloc
.p
->addend
;
4831 /* Figure out the symbol index. */
4832 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4833 + output_section
->reloc_count
);
4834 if (link_order
->type
== bfd_section_reloc_link_order
)
4836 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4837 BFD_ASSERT (indx
!= 0);
4838 *rel_hash_ptr
= NULL
;
4842 struct elf_link_hash_entry
*h
;
4844 /* Treat a reloc against a defined symbol as though it were
4845 actually against the section. */
4846 h
= ((struct elf_link_hash_entry
*)
4847 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4848 link_order
->u
.reloc
.p
->u
.name
,
4849 false, false, true));
4851 && (h
->root
.type
== bfd_link_hash_defined
4852 || h
->root
.type
== bfd_link_hash_defweak
))
4856 section
= h
->root
.u
.def
.section
;
4857 indx
= section
->output_section
->target_index
;
4858 *rel_hash_ptr
= NULL
;
4859 /* It seems that we ought to add the symbol value to the
4860 addend here, but in practice it has already been added
4861 because it was passed to constructor_callback. */
4862 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4866 /* Setting the index to -2 tells elf_link_output_extsym that
4867 this symbol is used by a reloc. */
4874 if (! ((*info
->callbacks
->unattached_reloc
)
4875 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4876 (asection
*) NULL
, (bfd_vma
) 0)))
4882 /* If this is an inplace reloc, we must write the addend into the
4884 if (howto
->partial_inplace
&& addend
!= 0)
4887 bfd_reloc_status_type rstat
;
4891 size
= bfd_get_reloc_size (howto
);
4892 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4893 if (buf
== (bfd_byte
*) NULL
)
4895 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4901 case bfd_reloc_outofrange
:
4903 case bfd_reloc_overflow
:
4904 if (! ((*info
->callbacks
->reloc_overflow
)
4906 (link_order
->type
== bfd_section_reloc_link_order
4907 ? bfd_section_name (output_bfd
,
4908 link_order
->u
.reloc
.p
->u
.section
)
4909 : link_order
->u
.reloc
.p
->u
.name
),
4910 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4918 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4919 (file_ptr
) link_order
->offset
, size
);
4925 /* The address of a reloc is relative to the section in a
4926 relocateable file, and is a virtual address in an executable
4928 offset
= link_order
->offset
;
4929 if (! info
->relocateable
)
4930 offset
+= output_section
->vma
;
4932 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4934 if (rel_hdr
->sh_type
== SHT_REL
)
4936 Elf_Internal_Rel irel
;
4937 Elf_External_Rel
*erel
;
4939 irel
.r_offset
= offset
;
4940 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4941 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
4942 + output_section
->reloc_count
);
4943 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4947 Elf_Internal_Rela irela
;
4948 Elf_External_Rela
*erela
;
4950 irela
.r_offset
= offset
;
4951 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4952 irela
.r_addend
= addend
;
4953 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
4954 + output_section
->reloc_count
);
4955 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
4958 ++output_section
->reloc_count
;
4964 /* Allocate a pointer to live in a linker created section. */
4967 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
4969 struct bfd_link_info
*info
;
4970 elf_linker_section_t
*lsect
;
4971 struct elf_link_hash_entry
*h
;
4972 const Elf_Internal_Rela
*rel
;
4974 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
4975 elf_linker_section_pointers_t
*linker_section_ptr
;
4976 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
4978 BFD_ASSERT (lsect
!= NULL
);
4980 /* Is this a global symbol? */
4983 /* Has this symbol already been allocated, if so, our work is done */
4984 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4989 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
4990 /* Make sure this symbol is output as a dynamic symbol. */
4991 if (h
->dynindx
== -1)
4993 if (! elf_link_record_dynamic_symbol (info
, h
))
4997 if (lsect
->rel_section
)
4998 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5001 else /* Allocation of a pointer to a local symbol */
5003 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5005 /* Allocate a table to hold the local symbols if first time */
5008 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5009 register unsigned int i
;
5011 ptr
= (elf_linker_section_pointers_t
**)
5012 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5017 elf_local_ptr_offsets (abfd
) = ptr
;
5018 for (i
= 0; i
< num_symbols
; i
++)
5019 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5022 /* Has this symbol already been allocated, if so, our work is done */
5023 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5028 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5032 /* If we are generating a shared object, we need to
5033 output a R_<xxx>_RELATIVE reloc so that the
5034 dynamic linker can adjust this GOT entry. */
5035 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5036 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5040 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5041 from internal memory. */
5042 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5043 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5044 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5046 if (!linker_section_ptr
)
5049 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5050 linker_section_ptr
->addend
= rel
->r_addend
;
5051 linker_section_ptr
->which
= lsect
->which
;
5052 linker_section_ptr
->written_address_p
= false;
5053 *ptr_linker_section_ptr
= linker_section_ptr
;
5056 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5058 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5059 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5060 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5061 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5063 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5065 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5066 lsect
->sym_hash
->root
.root
.string
,
5067 (long)ARCH_SIZE
/ 8,
5068 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5074 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5076 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5079 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5080 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5088 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5091 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5094 /* Fill in the address for a pointer generated in alinker section. */
5097 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5100 struct bfd_link_info
*info
;
5101 elf_linker_section_t
*lsect
;
5102 struct elf_link_hash_entry
*h
;
5104 const Elf_Internal_Rela
*rel
;
5107 elf_linker_section_pointers_t
*linker_section_ptr
;
5109 BFD_ASSERT (lsect
!= NULL
);
5111 if (h
!= NULL
) /* global symbol */
5113 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5117 BFD_ASSERT (linker_section_ptr
!= NULL
);
5119 if (! elf_hash_table (info
)->dynamic_sections_created
5122 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5124 /* This is actually a static link, or it is a
5125 -Bsymbolic link and the symbol is defined
5126 locally. We must initialize this entry in the
5129 When doing a dynamic link, we create a .rela.<xxx>
5130 relocation entry to initialize the value. This
5131 is done in the finish_dynamic_symbol routine. */
5132 if (!linker_section_ptr
->written_address_p
)
5134 linker_section_ptr
->written_address_p
= true;
5135 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5136 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5140 else /* local symbol */
5142 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5143 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5144 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5145 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5149 BFD_ASSERT (linker_section_ptr
!= NULL
);
5151 /* Write out pointer if it hasn't been rewritten out before */
5152 if (!linker_section_ptr
->written_address_p
)
5154 linker_section_ptr
->written_address_p
= true;
5155 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5156 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5160 asection
*srel
= lsect
->rel_section
;
5161 Elf_Internal_Rela outrel
;
5163 /* We need to generate a relative reloc for the dynamic linker. */
5165 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5168 BFD_ASSERT (srel
!= NULL
);
5170 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5171 + lsect
->section
->output_offset
5172 + linker_section_ptr
->offset
);
5173 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5174 outrel
.r_addend
= 0;
5175 elf_swap_reloca_out (output_bfd
, &outrel
,
5176 (((Elf_External_Rela
*)
5177 lsect
->section
->contents
)
5178 + lsect
->section
->reloc_count
));
5179 ++lsect
->section
->reloc_count
;
5184 relocation
= (lsect
->section
->output_offset
5185 + linker_section_ptr
->offset
5186 - lsect
->hole_offset
5187 - lsect
->sym_offset
);
5190 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5191 lsect
->name
, (long)relocation
, (long)relocation
);
5194 /* Subtract out the addend, because it will get added back in by the normal
5196 return relocation
- linker_section_ptr
->addend
;