2 Copyright 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
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
;
304 bind
= ELF_ST_BIND (sym
->st_info
);
306 if (! bfd_is_und_section (sec
))
307 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
309 h
= ((struct elf_link_hash_entry
*)
310 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
315 /* This code is for coping with dynamic objects, and is only useful
316 if we are doing an ELF link. */
317 if (info
->hash
->creator
!= abfd
->xvec
)
320 /* For merging, we only care about real symbols. */
322 while (h
->root
.type
== bfd_link_hash_indirect
323 || h
->root
.type
== bfd_link_hash_warning
)
324 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
326 /* If we just created the symbol, mark it as being an ELF symbol.
327 Other than that, there is nothing to do--there is no merge issue
328 with a newly defined symbol--so we just return. */
330 if (h
->root
.type
== bfd_link_hash_new
)
332 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
336 /* OLDBFD is a BFD associated with the existing symbol. */
338 switch (h
->root
.type
)
344 case bfd_link_hash_undefined
:
345 case bfd_link_hash_undefweak
:
346 oldbfd
= h
->root
.u
.undef
.abfd
;
349 case bfd_link_hash_defined
:
350 case bfd_link_hash_defweak
:
351 oldbfd
= h
->root
.u
.def
.section
->owner
;
354 case bfd_link_hash_common
:
355 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
359 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
360 respectively, is from a dynamic object. */
362 if ((abfd
->flags
& DYNAMIC
) != 0)
367 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
372 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
373 respectively, appear to be a definition rather than reference. */
375 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
380 if (h
->root
.type
== bfd_link_hash_undefined
381 || h
->root
.type
== bfd_link_hash_undefweak
382 || h
->root
.type
== bfd_link_hash_common
)
387 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
388 symbol, respectively, appears to be a common symbol in a dynamic
389 object. If a symbol appears in an uninitialized section, and is
390 not weak, and is not a function, then it may be a common symbol
391 which was resolved when the dynamic object was created. We want
392 to treat such symbols specially, because they raise special
393 considerations when setting the symbol size: if the symbol
394 appears as a common symbol in a regular object, and the size in
395 the regular object is larger, we must make sure that we use the
396 larger size. This problematic case can always be avoided in C,
397 but it must be handled correctly when using Fortran shared
400 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
401 likewise for OLDDYNCOMMON and OLDDEF.
403 Note that this test is just a heuristic, and that it is quite
404 possible to have an uninitialized symbol in a shared object which
405 is really a definition, rather than a common symbol. This could
406 lead to some minor confusion when the symbol really is a common
407 symbol in some regular object. However, I think it will be
412 && (sec
->flags
& SEC_ALLOC
) != 0
413 && (sec
->flags
& SEC_LOAD
) == 0
416 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
419 newdyncommon
= false;
423 && h
->root
.type
== bfd_link_hash_defined
424 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
425 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
426 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
428 && h
->type
!= STT_FUNC
)
431 olddyncommon
= false;
433 /* It's OK to change the type if either the existing symbol or the
434 new symbol is weak. */
436 if (h
->root
.type
== bfd_link_hash_defweak
437 || h
->root
.type
== bfd_link_hash_undefweak
439 *type_change_ok
= true;
441 /* It's OK to change the size if either the existing symbol or the
442 new symbol is weak, or if the old symbol is undefined. */
445 || h
->root
.type
== bfd_link_hash_undefined
)
446 *size_change_ok
= true;
448 /* If both the old and the new symbols look like common symbols in a
449 dynamic object, set the size of the symbol to the larger of the
454 && sym
->st_size
!= h
->size
)
456 /* Since we think we have two common symbols, issue a multiple
457 common warning if desired. Note that we only warn if the
458 size is different. If the size is the same, we simply let
459 the old symbol override the new one as normally happens with
460 symbols defined in dynamic objects. */
462 if (! ((*info
->callbacks
->multiple_common
)
463 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
464 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
467 if (sym
->st_size
> h
->size
)
468 h
->size
= sym
->st_size
;
470 *size_change_ok
= true;
473 /* If we are looking at a dynamic object, and we have found a
474 definition, we need to see if the symbol was already defined by
475 some other object. If so, we want to use the existing
476 definition, and we do not want to report a multiple symbol
477 definition error; we do this by clobbering *PSEC to be
480 We treat a common symbol as a definition if the symbol in the
481 shared library is a function, since common symbols always
482 represent variables; this can cause confusion in principle, but
483 any such confusion would seem to indicate an erroneous program or
484 shared library. We also permit a common symbol in a regular
485 object to override a weak symbol in a shared object. */
490 || (h
->root
.type
== bfd_link_hash_common
492 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
496 newdyncommon
= false;
498 *psec
= sec
= bfd_und_section_ptr
;
499 *size_change_ok
= true;
501 /* If we get here when the old symbol is a common symbol, then
502 we are explicitly letting it override a weak symbol or
503 function in a dynamic object, and we don't want to warn about
504 a type change. If the old symbol is a defined symbol, a type
505 change warning may still be appropriate. */
507 if (h
->root
.type
== bfd_link_hash_common
)
508 *type_change_ok
= true;
511 /* Handle the special case of an old common symbol merging with a
512 new symbol which looks like a common symbol in a shared object.
513 We change *PSEC and *PVALUE to make the new symbol look like a
514 common symbol, and let _bfd_generic_link_add_one_symbol will do
518 && h
->root
.type
== bfd_link_hash_common
)
522 newdyncommon
= false;
523 *pvalue
= sym
->st_size
;
524 *psec
= sec
= bfd_com_section_ptr
;
525 *size_change_ok
= true;
528 /* If the old symbol is from a dynamic object, and the new symbol is
529 a definition which is not from a dynamic object, then the new
530 symbol overrides the old symbol. Symbols from regular files
531 always take precedence over symbols from dynamic objects, even if
532 they are defined after the dynamic object in the link.
534 As above, we again permit a common symbol in a regular object to
535 override a definition in a shared object if the shared object
536 symbol is a function or is weak. */
540 || (bfd_is_com_section (sec
)
541 && (h
->root
.type
== bfd_link_hash_defweak
542 || h
->type
== STT_FUNC
)))
545 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
547 /* Change the hash table entry to undefined, and let
548 _bfd_generic_link_add_one_symbol do the right thing with the
551 h
->root
.type
= bfd_link_hash_undefined
;
552 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
553 *size_change_ok
= true;
556 olddyncommon
= false;
558 /* We again permit a type change when a common symbol may be
559 overriding a function. */
561 if (bfd_is_com_section (sec
))
562 *type_change_ok
= true;
564 /* This union may have been set to be non-NULL when this symbol
565 was seen in a dynamic object. We must force the union to be
566 NULL, so that it is correct for a regular symbol. */
568 h
->verinfo
.vertree
= NULL
;
570 /* In this special case, if H is the target of an indirection,
571 we want the caller to frob with H rather than with the
572 indirect symbol. That will permit the caller to redefine the
573 target of the indirection, rather than the indirect symbol
574 itself. FIXME: This will break the -y option if we store a
575 symbol with a different name. */
579 /* Handle the special case of a new common symbol merging with an
580 old symbol that looks like it might be a common symbol defined in
581 a shared object. Note that we have already handled the case in
582 which a new common symbol should simply override the definition
583 in the shared library. */
586 && bfd_is_com_section (sec
)
589 /* It would be best if we could set the hash table entry to a
590 common symbol, but we don't know what to use for the section
592 if (! ((*info
->callbacks
->multiple_common
)
593 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
594 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
597 /* If the predumed common symbol in the dynamic object is
598 larger, pretend that the new symbol has its size. */
600 if (h
->size
> *pvalue
)
603 /* FIXME: We no longer know the alignment required by the symbol
604 in the dynamic object, so we just wind up using the one from
605 the regular object. */
608 olddyncommon
= false;
610 h
->root
.type
= bfd_link_hash_undefined
;
611 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
613 *size_change_ok
= true;
614 *type_change_ok
= true;
616 h
->verinfo
.vertree
= NULL
;
622 /* Add symbols from an ELF object file to the linker hash table. */
625 elf_link_add_object_symbols (abfd
, info
)
627 struct bfd_link_info
*info
;
629 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
630 const Elf_Internal_Sym
*,
631 const char **, flagword
*,
632 asection
**, bfd_vma
*));
633 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
634 asection
*, const Elf_Internal_Rela
*));
636 Elf_Internal_Shdr
*hdr
;
640 Elf_External_Sym
*buf
= NULL
;
641 struct elf_link_hash_entry
**sym_hash
;
643 bfd_byte
*dynver
= NULL
;
644 Elf_External_Versym
*extversym
= NULL
;
645 Elf_External_Versym
*ever
;
646 Elf_External_Dyn
*dynbuf
= NULL
;
647 struct elf_link_hash_entry
*weaks
;
648 Elf_External_Sym
*esym
;
649 Elf_External_Sym
*esymend
;
651 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
652 collect
= get_elf_backend_data (abfd
)->collect
;
654 if ((abfd
->flags
& DYNAMIC
) == 0)
660 /* You can't use -r against a dynamic object. Also, there's no
661 hope of using a dynamic object which does not exactly match
662 the format of the output file. */
663 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
665 bfd_set_error (bfd_error_invalid_operation
);
670 /* As a GNU extension, any input sections which are named
671 .gnu.warning.SYMBOL are treated as warning symbols for the given
672 symbol. This differs from .gnu.warning sections, which generate
673 warnings when they are included in an output file. */
678 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
682 name
= bfd_get_section_name (abfd
, s
);
683 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
688 name
+= sizeof ".gnu.warning." - 1;
690 /* If this is a shared object, then look up the symbol
691 in the hash table. If it is there, and it is already
692 been defined, then we will not be using the entry
693 from this shared object, so we don't need to warn.
694 FIXME: If we see the definition in a regular object
695 later on, we will warn, but we shouldn't. The only
696 fix is to keep track of what warnings we are supposed
697 to emit, and then handle them all at the end of the
699 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
701 struct elf_link_hash_entry
*h
;
703 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
706 /* FIXME: What about bfd_link_hash_common? */
708 && (h
->root
.type
== bfd_link_hash_defined
709 || h
->root
.type
== bfd_link_hash_defweak
))
711 /* We don't want to issue this warning. Clobber
712 the section size so that the warning does not
713 get copied into the output file. */
719 sz
= bfd_section_size (abfd
, s
);
720 msg
= (char *) bfd_alloc (abfd
, sz
);
724 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
727 if (! (_bfd_generic_link_add_one_symbol
728 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
729 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
732 if (! info
->relocateable
)
734 /* Clobber the section size so that the warning does
735 not get copied into the output file. */
742 /* If this is a dynamic object, we always link against the .dynsym
743 symbol table, not the .symtab symbol table. The dynamic linker
744 will only see the .dynsym symbol table, so there is no reason to
745 look at .symtab for a dynamic object. */
747 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
748 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
750 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
754 /* Read in any version definitions. */
756 if (! _bfd_elf_slurp_version_tables (abfd
))
759 /* Read in the symbol versions, but don't bother to convert them
760 to internal format. */
761 if (elf_dynversym (abfd
) != 0)
763 Elf_Internal_Shdr
*versymhdr
;
765 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
766 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
767 if (extversym
== NULL
)
769 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
770 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
771 != versymhdr
->sh_size
))
776 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
778 /* The sh_info field of the symtab header tells us where the
779 external symbols start. We don't care about the local symbols at
781 if (elf_bad_symtab (abfd
))
783 extsymcount
= symcount
;
788 extsymcount
= symcount
- hdr
->sh_info
;
789 extsymoff
= hdr
->sh_info
;
792 buf
= ((Elf_External_Sym
*)
793 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
794 if (buf
== NULL
&& extsymcount
!= 0)
797 /* We store a pointer to the hash table entry for each external
799 sym_hash
= ((struct elf_link_hash_entry
**)
801 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
802 if (sym_hash
== NULL
)
804 elf_sym_hashes (abfd
) = sym_hash
;
808 /* If we are creating a shared library, create all the dynamic
809 sections immediately. We need to attach them to something,
810 so we attach them to this BFD, provided it is the right
811 format. FIXME: If there are no input BFD's of the same
812 format as the output, we can't make a shared library. */
814 && ! elf_hash_table (info
)->dynamic_sections_created
815 && abfd
->xvec
== info
->hash
->creator
)
817 if (! elf_link_create_dynamic_sections (abfd
, info
))
826 bfd_size_type oldsize
;
827 bfd_size_type strindex
;
829 /* Find the name to use in a DT_NEEDED entry that refers to this
830 object. If the object has a DT_SONAME entry, we use it.
831 Otherwise, if the generic linker stuck something in
832 elf_dt_name, we use that. Otherwise, we just use the file
833 name. If the generic linker put a null string into
834 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
835 there is a DT_SONAME entry. */
837 name
= bfd_get_filename (abfd
);
838 if (elf_dt_name (abfd
) != NULL
)
840 name
= elf_dt_name (abfd
);
844 s
= bfd_get_section_by_name (abfd
, ".dynamic");
847 Elf_External_Dyn
*extdyn
;
848 Elf_External_Dyn
*extdynend
;
852 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
856 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
857 (file_ptr
) 0, s
->_raw_size
))
860 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
863 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
866 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
867 for (; extdyn
< extdynend
; extdyn
++)
869 Elf_Internal_Dyn dyn
;
871 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
872 if (dyn
.d_tag
== DT_SONAME
)
874 name
= bfd_elf_string_from_elf_section (abfd
, link
,
879 if (dyn
.d_tag
== DT_NEEDED
)
881 struct bfd_link_needed_list
*n
, **pn
;
884 n
= ((struct bfd_link_needed_list
*)
885 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
886 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
888 if (n
== NULL
|| fnm
== NULL
)
890 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
897 for (pn
= &elf_hash_table (info
)->needed
;
909 /* We do not want to include any of the sections in a dynamic
910 object in the output file. We hack by simply clobbering the
911 list of sections in the BFD. This could be handled more
912 cleanly by, say, a new section flag; the existing
913 SEC_NEVER_LOAD flag is not the one we want, because that one
914 still implies that the section takes up space in the output
916 abfd
->sections
= NULL
;
917 abfd
->section_count
= 0;
919 /* If this is the first dynamic object found in the link, create
920 the special sections required for dynamic linking. */
921 if (! elf_hash_table (info
)->dynamic_sections_created
)
923 if (! elf_link_create_dynamic_sections (abfd
, info
))
929 /* Add a DT_NEEDED entry for this dynamic object. */
930 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
931 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
933 if (strindex
== (bfd_size_type
) -1)
936 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
939 Elf_External_Dyn
*dyncon
, *dynconend
;
941 /* The hash table size did not change, which means that
942 the dynamic object name was already entered. If we
943 have already included this dynamic object in the
944 link, just ignore it. There is no reason to include
945 a particular dynamic object more than once. */
946 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
948 BFD_ASSERT (sdyn
!= NULL
);
950 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
951 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
953 for (; dyncon
< dynconend
; dyncon
++)
955 Elf_Internal_Dyn dyn
;
957 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
959 if (dyn
.d_tag
== DT_NEEDED
960 && dyn
.d_un
.d_val
== strindex
)
964 if (extversym
!= NULL
)
971 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
975 /* Save the SONAME, if there is one, because sometimes the
976 linker emulation code will need to know it. */
978 name
= bfd_get_filename (abfd
);
979 elf_dt_name (abfd
) = name
;
983 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
985 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
986 != extsymcount
* sizeof (Elf_External_Sym
)))
991 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
992 esymend
= buf
+ extsymcount
;
995 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
997 Elf_Internal_Sym sym
;
1003 struct elf_link_hash_entry
*h
;
1005 boolean size_change_ok
, type_change_ok
;
1006 boolean new_weakdef
;
1007 unsigned int old_alignment
;
1009 elf_swap_symbol_in (abfd
, esym
, &sym
);
1011 flags
= BSF_NO_FLAGS
;
1013 value
= sym
.st_value
;
1016 bind
= ELF_ST_BIND (sym
.st_info
);
1017 if (bind
== STB_LOCAL
)
1019 /* This should be impossible, since ELF requires that all
1020 global symbols follow all local symbols, and that sh_info
1021 point to the first global symbol. Unfortunatealy, Irix 5
1025 else if (bind
== STB_GLOBAL
)
1027 if (sym
.st_shndx
!= SHN_UNDEF
1028 && sym
.st_shndx
!= SHN_COMMON
)
1033 else if (bind
== STB_WEAK
)
1037 /* Leave it up to the processor backend. */
1040 if (sym
.st_shndx
== SHN_UNDEF
)
1041 sec
= bfd_und_section_ptr
;
1042 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1044 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1046 sec
= bfd_abs_section_ptr
;
1047 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1050 else if (sym
.st_shndx
== SHN_ABS
)
1051 sec
= bfd_abs_section_ptr
;
1052 else if (sym
.st_shndx
== SHN_COMMON
)
1054 sec
= bfd_com_section_ptr
;
1055 /* What ELF calls the size we call the value. What ELF
1056 calls the value we call the alignment. */
1057 value
= sym
.st_size
;
1061 /* Leave it up to the processor backend. */
1064 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1065 if (name
== (const char *) NULL
)
1068 if (add_symbol_hook
)
1070 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1074 /* The hook function sets the name to NULL if this symbol
1075 should be skipped for some reason. */
1076 if (name
== (const char *) NULL
)
1080 /* Sanity check that all possibilities were handled. */
1081 if (sec
== (asection
*) NULL
)
1083 bfd_set_error (bfd_error_bad_value
);
1087 if (bfd_is_und_section (sec
)
1088 || bfd_is_com_section (sec
))
1093 size_change_ok
= false;
1094 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1096 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1098 Elf_Internal_Versym iver
;
1099 unsigned int vernum
= 0;
1104 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1105 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1107 /* If this is a hidden symbol, or if it is not version
1108 1, we append the version name to the symbol name.
1109 However, we do not modify a non-hidden absolute
1110 symbol, because it might be the version symbol
1111 itself. FIXME: What if it isn't? */
1112 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1113 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1116 int namelen
, newlen
;
1119 if (sym
.st_shndx
!= SHN_UNDEF
)
1121 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1123 (*_bfd_error_handler
)
1124 (_("%s: %s: invalid version %u (max %d)"),
1125 abfd
->filename
, name
, vernum
,
1126 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1127 bfd_set_error (bfd_error_bad_value
);
1130 else if (vernum
> 1)
1132 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1138 /* We cannot simply test for the number of
1139 entries in the VERNEED section since the
1140 numbers for the needed versions do not start
1142 Elf_Internal_Verneed
*t
;
1145 for (t
= elf_tdata (abfd
)->verref
;
1149 Elf_Internal_Vernaux
*a
;
1151 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1153 if (a
->vna_other
== vernum
)
1155 verstr
= a
->vna_nodename
;
1164 (*_bfd_error_handler
)
1165 (_("%s: %s: invalid needed version %d"),
1166 abfd
->filename
, name
, vernum
);
1167 bfd_set_error (bfd_error_bad_value
);
1172 namelen
= strlen (name
);
1173 newlen
= namelen
+ strlen (verstr
) + 2;
1174 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1177 newname
= (char *) bfd_alloc (abfd
, newlen
);
1178 if (newname
== NULL
)
1180 strcpy (newname
, name
);
1181 p
= newname
+ namelen
;
1183 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1191 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1192 sym_hash
, &override
, &type_change_ok
,
1200 while (h
->root
.type
== bfd_link_hash_indirect
1201 || h
->root
.type
== bfd_link_hash_warning
)
1202 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1204 /* Remember the old alignment if this is a common symbol, so
1205 that we don't reduce the alignment later on. We can't
1206 check later, because _bfd_generic_link_add_one_symbol
1207 will set a default for the alignment which we want to
1209 if (h
->root
.type
== bfd_link_hash_common
)
1210 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1212 if (elf_tdata (abfd
)->verdef
!= NULL
1216 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1219 if (! (_bfd_generic_link_add_one_symbol
1220 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1221 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1225 while (h
->root
.type
== bfd_link_hash_indirect
1226 || h
->root
.type
== bfd_link_hash_warning
)
1227 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1230 new_weakdef
= false;
1233 && (flags
& BSF_WEAK
) != 0
1234 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1235 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1236 && h
->weakdef
== NULL
)
1238 /* Keep a list of all weak defined non function symbols from
1239 a dynamic object, using the weakdef field. Later in this
1240 function we will set the weakdef field to the correct
1241 value. We only put non-function symbols from dynamic
1242 objects on this list, because that happens to be the only
1243 time we need to know the normal symbol corresponding to a
1244 weak symbol, and the information is time consuming to
1245 figure out. If the weakdef field is not already NULL,
1246 then this symbol was already defined by some previous
1247 dynamic object, and we will be using that previous
1248 definition anyhow. */
1255 /* Set the alignment of a common symbol. */
1256 if (sym
.st_shndx
== SHN_COMMON
1257 && h
->root
.type
== bfd_link_hash_common
)
1261 align
= bfd_log2 (sym
.st_value
);
1262 if (align
> old_alignment
)
1263 h
->root
.u
.c
.p
->alignment_power
= align
;
1266 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1272 /* Remember the symbol size and type. */
1273 if (sym
.st_size
!= 0
1274 && (definition
|| h
->size
== 0))
1276 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1277 (*_bfd_error_handler
)
1278 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1279 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1280 bfd_get_filename (abfd
));
1282 h
->size
= sym
.st_size
;
1285 /* If this is a common symbol, then we always want H->SIZE
1286 to be the size of the common symbol. The code just above
1287 won't fix the size if a common symbol becomes larger. We
1288 don't warn about a size change here, because that is
1289 covered by --warn-common. */
1290 if (h
->root
.type
== bfd_link_hash_common
)
1291 h
->size
= h
->root
.u
.c
.size
;
1293 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1294 && (definition
|| h
->type
== STT_NOTYPE
))
1296 if (h
->type
!= STT_NOTYPE
1297 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1298 && ! type_change_ok
)
1299 (*_bfd_error_handler
)
1300 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1301 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1302 bfd_get_filename (abfd
));
1304 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1307 if (sym
.st_other
!= 0
1308 && (definition
|| h
->other
== 0))
1309 h
->other
= sym
.st_other
;
1311 /* Set a flag in the hash table entry indicating the type of
1312 reference or definition we just found. Keep a count of
1313 the number of dynamic symbols we find. A dynamic symbol
1314 is one which is referenced or defined by both a regular
1315 object and a shared object. */
1316 old_flags
= h
->elf_link_hash_flags
;
1321 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1323 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1325 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1326 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1332 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1334 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1335 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1336 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1337 || (h
->weakdef
!= NULL
1339 && h
->weakdef
->dynindx
!= -1))
1343 h
->elf_link_hash_flags
|= new_flag
;
1345 /* If this symbol has a version, and it is the default
1346 version, we create an indirect symbol from the default
1347 name to the fully decorated name. This will cause
1348 external references which do not specify a version to be
1349 bound to this version of the symbol. */
1354 p
= strchr (name
, ELF_VER_CHR
);
1355 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1358 struct elf_link_hash_entry
*hi
;
1361 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1363 if (shortname
== NULL
)
1365 strncpy (shortname
, name
, p
- name
);
1366 shortname
[p
- name
] = '\0';
1368 /* We are going to create a new symbol. Merge it
1369 with any existing symbol with this name. For the
1370 purposes of the merge, act as though we were
1371 defining the symbol we just defined, although we
1372 actually going to define an indirect symbol. */
1373 type_change_ok
= false;
1374 size_change_ok
= false;
1375 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1376 &value
, &hi
, &override
,
1377 &type_change_ok
, &size_change_ok
))
1382 if (! (_bfd_generic_link_add_one_symbol
1383 (info
, abfd
, shortname
, BSF_INDIRECT
,
1384 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1385 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1390 /* In this case the symbol named SHORTNAME is
1391 overriding the indirect symbol we want to
1392 add. We were planning on making SHORTNAME an
1393 indirect symbol referring to NAME. SHORTNAME
1394 is the name without a version. NAME is the
1395 fully versioned name, and it is the default
1398 Overriding means that we already saw a
1399 definition for the symbol SHORTNAME in a
1400 regular object, and it is overriding the
1401 symbol defined in the dynamic object.
1403 When this happens, we actually want to change
1404 NAME, the symbol we just added, to refer to
1405 SHORTNAME. This will cause references to
1406 NAME in the shared object to become
1407 references to SHORTNAME in the regular
1408 object. This is what we expect when we
1409 override a function in a shared object: that
1410 the references in the shared object will be
1411 mapped to the definition in the regular
1414 while (hi
->root
.type
== bfd_link_hash_indirect
1415 || hi
->root
.type
== bfd_link_hash_warning
)
1416 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1418 h
->root
.type
= bfd_link_hash_indirect
;
1419 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1420 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1422 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1423 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1424 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1428 /* Now set HI to H, so that the following code
1429 will set the other fields correctly. */
1433 /* If there is a duplicate definition somewhere,
1434 then HI may not point to an indirect symbol. We
1435 will have reported an error to the user in that
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 struct elf_link_hash_entry
*ht
;
1442 /* If the symbol became indirect, then we assume
1443 that we have not seen a definition before. */
1444 BFD_ASSERT ((hi
->elf_link_hash_flags
1445 & (ELF_LINK_HASH_DEF_DYNAMIC
1446 | ELF_LINK_HASH_DEF_REGULAR
))
1449 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1451 /* Copy down any references that we may have
1452 already seen to the symbol which just became
1454 ht
->elf_link_hash_flags
|=
1455 (hi
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_REF_DYNAMIC
1457 | ELF_LINK_HASH_REF_REGULAR
));
1459 /* Copy over the global table offset entry.
1460 This may have been already set up by a
1461 check_relocs routine. */
1462 if (ht
->got
.offset
== (bfd_vma
) -1)
1464 ht
->got
.offset
= hi
->got
.offset
;
1465 hi
->got
.offset
= (bfd_vma
) -1;
1467 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1469 if (ht
->dynindx
== -1)
1471 ht
->dynindx
= hi
->dynindx
;
1472 ht
->dynstr_index
= hi
->dynstr_index
;
1474 hi
->dynstr_index
= 0;
1476 BFD_ASSERT (hi
->dynindx
== -1);
1478 /* FIXME: There may be other information to copy
1479 over for particular targets. */
1481 /* See if the new flags lead us to realize that
1482 the symbol must be dynamic. */
1488 || ((hi
->elf_link_hash_flags
1489 & ELF_LINK_HASH_REF_DYNAMIC
)
1495 if ((hi
->elf_link_hash_flags
1496 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1502 /* We also need to define an indirection from the
1503 nondefault version of the symbol. */
1505 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1507 if (shortname
== NULL
)
1509 strncpy (shortname
, name
, p
- name
);
1510 strcpy (shortname
+ (p
- name
), p
+ 1);
1512 /* Once again, merge with any existing symbol. */
1513 type_change_ok
= false;
1514 size_change_ok
= false;
1515 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1516 &value
, &hi
, &override
,
1517 &type_change_ok
, &size_change_ok
))
1522 /* Here SHORTNAME is a versioned name, so we
1523 don't expect to see the type of override we
1524 do in the case above. */
1525 (*_bfd_error_handler
)
1526 (_("%s: warning: unexpected redefinition of `%s'"),
1527 bfd_get_filename (abfd
), shortname
);
1531 if (! (_bfd_generic_link_add_one_symbol
1532 (info
, abfd
, shortname
, BSF_INDIRECT
,
1533 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1534 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1537 /* If there is a duplicate definition somewhere,
1538 then HI may not point to an indirect symbol.
1539 We will have reported an error to the user in
1542 if (hi
->root
.type
== bfd_link_hash_indirect
)
1544 /* If the symbol became indirect, then we
1545 assume that we have not seen a definition
1547 BFD_ASSERT ((hi
->elf_link_hash_flags
1548 & (ELF_LINK_HASH_DEF_DYNAMIC
1549 | ELF_LINK_HASH_DEF_REGULAR
))
1552 /* Copy down any references that we may have
1553 already seen to the symbol which just
1555 h
->elf_link_hash_flags
|=
1556 (hi
->elf_link_hash_flags
1557 & (ELF_LINK_HASH_REF_DYNAMIC
1558 | ELF_LINK_HASH_REF_REGULAR
));
1560 /* Copy over the global table offset entry.
1561 This may have been already set up by a
1562 check_relocs routine. */
1563 if (h
->got
.offset
== (bfd_vma
) -1)
1565 h
->got
.offset
= hi
->got
.offset
;
1566 hi
->got
.offset
= (bfd_vma
) -1;
1568 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1570 if (h
->dynindx
== -1)
1572 h
->dynindx
= hi
->dynindx
;
1573 h
->dynstr_index
= hi
->dynstr_index
;
1575 hi
->dynstr_index
= 0;
1577 BFD_ASSERT (hi
->dynindx
== -1);
1579 /* FIXME: There may be other information to
1580 copy over for particular targets. */
1582 /* See if the new flags lead us to realize
1583 that the symbol must be dynamic. */
1589 || ((hi
->elf_link_hash_flags
1590 & ELF_LINK_HASH_REF_DYNAMIC
)
1596 if ((hi
->elf_link_hash_flags
1597 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1606 if (dynsym
&& h
->dynindx
== -1)
1608 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1610 if (h
->weakdef
!= NULL
1612 && h
->weakdef
->dynindx
== -1)
1614 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1622 /* Now set the weakdefs field correctly for all the weak defined
1623 symbols we found. The only way to do this is to search all the
1624 symbols. Since we only need the information for non functions in
1625 dynamic objects, that's the only time we actually put anything on
1626 the list WEAKS. We need this information so that if a regular
1627 object refers to a symbol defined weakly in a dynamic object, the
1628 real symbol in the dynamic object is also put in the dynamic
1629 symbols; we also must arrange for both symbols to point to the
1630 same memory location. We could handle the general case of symbol
1631 aliasing, but a general symbol alias can only be generated in
1632 assembler code, handling it correctly would be very time
1633 consuming, and other ELF linkers don't handle general aliasing
1635 while (weaks
!= NULL
)
1637 struct elf_link_hash_entry
*hlook
;
1640 struct elf_link_hash_entry
**hpp
;
1641 struct elf_link_hash_entry
**hppend
;
1644 weaks
= hlook
->weakdef
;
1645 hlook
->weakdef
= NULL
;
1647 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1648 || hlook
->root
.type
== bfd_link_hash_defweak
1649 || hlook
->root
.type
== bfd_link_hash_common
1650 || hlook
->root
.type
== bfd_link_hash_indirect
);
1651 slook
= hlook
->root
.u
.def
.section
;
1652 vlook
= hlook
->root
.u
.def
.value
;
1654 hpp
= elf_sym_hashes (abfd
);
1655 hppend
= hpp
+ extsymcount
;
1656 for (; hpp
< hppend
; hpp
++)
1658 struct elf_link_hash_entry
*h
;
1661 if (h
!= NULL
&& h
!= hlook
1662 && h
->root
.type
== bfd_link_hash_defined
1663 && h
->root
.u
.def
.section
== slook
1664 && h
->root
.u
.def
.value
== vlook
)
1668 /* If the weak definition is in the list of dynamic
1669 symbols, make sure the real definition is put there
1671 if (hlook
->dynindx
!= -1
1672 && h
->dynindx
== -1)
1674 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1678 /* If the real definition is in the list of dynamic
1679 symbols, make sure the weak definition is put there
1680 as well. If we don't do this, then the dynamic
1681 loader might not merge the entries for the real
1682 definition and the weak definition. */
1683 if (h
->dynindx
!= -1
1684 && hlook
->dynindx
== -1)
1686 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1701 if (extversym
!= NULL
)
1707 /* If this object is the same format as the output object, and it is
1708 not a shared library, then let the backend look through the
1711 This is required to build global offset table entries and to
1712 arrange for dynamic relocs. It is not required for the
1713 particular common case of linking non PIC code, even when linking
1714 against shared libraries, but unfortunately there is no way of
1715 knowing whether an object file has been compiled PIC or not.
1716 Looking through the relocs is not particularly time consuming.
1717 The problem is that we must either (1) keep the relocs in memory,
1718 which causes the linker to require additional runtime memory or
1719 (2) read the relocs twice from the input file, which wastes time.
1720 This would be a good case for using mmap.
1722 I have no idea how to handle linking PIC code into a file of a
1723 different format. It probably can't be done. */
1724 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1726 && abfd
->xvec
== info
->hash
->creator
1727 && check_relocs
!= NULL
)
1731 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1733 Elf_Internal_Rela
*internal_relocs
;
1736 if ((o
->flags
& SEC_RELOC
) == 0
1737 || o
->reloc_count
== 0
1738 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1739 && (o
->flags
& SEC_DEBUGGING
) != 0)
1740 || bfd_is_abs_section (o
->output_section
))
1743 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1744 (abfd
, o
, (PTR
) NULL
,
1745 (Elf_Internal_Rela
*) NULL
,
1746 info
->keep_memory
));
1747 if (internal_relocs
== NULL
)
1750 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1752 if (! info
->keep_memory
)
1753 free (internal_relocs
);
1760 /* If this is a non-traditional, non-relocateable link, try to
1761 optimize the handling of the .stab/.stabstr sections. */
1763 && ! info
->relocateable
1764 && ! info
->traditional_format
1765 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1766 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1768 asection
*stab
, *stabstr
;
1770 stab
= bfd_get_section_by_name (abfd
, ".stab");
1773 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1775 if (stabstr
!= NULL
)
1777 struct bfd_elf_section_data
*secdata
;
1779 secdata
= elf_section_data (stab
);
1780 if (! _bfd_link_section_stabs (abfd
,
1781 &elf_hash_table (info
)->stab_info
,
1783 &secdata
->stab_info
))
1798 if (extversym
!= NULL
)
1803 /* Create some sections which will be filled in with dynamic linking
1804 information. ABFD is an input file which requires dynamic sections
1805 to be created. The dynamic sections take up virtual memory space
1806 when the final executable is run, so we need to create them before
1807 addresses are assigned to the output sections. We work out the
1808 actual contents and size of these sections later. */
1811 elf_link_create_dynamic_sections (abfd
, info
)
1813 struct bfd_link_info
*info
;
1816 register asection
*s
;
1817 struct elf_link_hash_entry
*h
;
1818 struct elf_backend_data
*bed
;
1820 if (elf_hash_table (info
)->dynamic_sections_created
)
1823 /* Make sure that all dynamic sections use the same input BFD. */
1824 if (elf_hash_table (info
)->dynobj
== NULL
)
1825 elf_hash_table (info
)->dynobj
= abfd
;
1827 abfd
= elf_hash_table (info
)->dynobj
;
1829 /* Note that we set the SEC_IN_MEMORY flag for all of these
1831 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1832 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1834 /* A dynamically linked executable has a .interp section, but a
1835 shared library does not. */
1838 s
= bfd_make_section (abfd
, ".interp");
1840 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1844 /* Create sections to hold version informations. These are removed
1845 if they are not needed. */
1846 s
= bfd_make_section (abfd
, ".gnu.version_d");
1848 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1849 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1852 s
= bfd_make_section (abfd
, ".gnu.version");
1854 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1855 || ! bfd_set_section_alignment (abfd
, s
, 1))
1858 s
= bfd_make_section (abfd
, ".gnu.version_r");
1860 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1861 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1864 s
= bfd_make_section (abfd
, ".dynsym");
1866 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1867 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1870 s
= bfd_make_section (abfd
, ".dynstr");
1872 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1875 /* Create a strtab to hold the dynamic symbol names. */
1876 if (elf_hash_table (info
)->dynstr
== NULL
)
1878 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1879 if (elf_hash_table (info
)->dynstr
== NULL
)
1883 s
= bfd_make_section (abfd
, ".dynamic");
1885 || ! bfd_set_section_flags (abfd
, s
, flags
)
1886 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1889 /* The special symbol _DYNAMIC is always set to the start of the
1890 .dynamic section. This call occurs before we have processed the
1891 symbols for any dynamic object, so we don't have to worry about
1892 overriding a dynamic definition. We could set _DYNAMIC in a
1893 linker script, but we only want to define it if we are, in fact,
1894 creating a .dynamic section. We don't want to define it if there
1895 is no .dynamic section, since on some ELF platforms the start up
1896 code examines it to decide how to initialize the process. */
1898 if (! (_bfd_generic_link_add_one_symbol
1899 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1900 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1901 (struct bfd_link_hash_entry
**) &h
)))
1903 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1904 h
->type
= STT_OBJECT
;
1907 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1910 s
= bfd_make_section (abfd
, ".hash");
1912 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1913 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1916 /* Let the backend create the rest of the sections. This lets the
1917 backend set the right flags. The backend will normally create
1918 the .got and .plt sections. */
1919 bed
= get_elf_backend_data (abfd
);
1920 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1923 elf_hash_table (info
)->dynamic_sections_created
= true;
1928 /* Add an entry to the .dynamic table. */
1931 elf_add_dynamic_entry (info
, tag
, val
)
1932 struct bfd_link_info
*info
;
1936 Elf_Internal_Dyn dyn
;
1940 bfd_byte
*newcontents
;
1942 dynobj
= elf_hash_table (info
)->dynobj
;
1944 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1945 BFD_ASSERT (s
!= NULL
);
1947 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1948 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1949 if (newcontents
== NULL
)
1953 dyn
.d_un
.d_val
= val
;
1954 elf_swap_dyn_out (dynobj
, &dyn
,
1955 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1957 s
->_raw_size
= newsize
;
1958 s
->contents
= newcontents
;
1964 /* Read and swap the relocs for a section. They may have been cached.
1965 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1966 they are used as buffers to read into. They are known to be large
1967 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1968 value is allocated using either malloc or bfd_alloc, according to
1969 the KEEP_MEMORY argument. */
1972 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1976 PTR external_relocs
;
1977 Elf_Internal_Rela
*internal_relocs
;
1978 boolean keep_memory
;
1980 Elf_Internal_Shdr
*rel_hdr
;
1982 Elf_Internal_Rela
*alloc2
= NULL
;
1984 if (elf_section_data (o
)->relocs
!= NULL
)
1985 return elf_section_data (o
)->relocs
;
1987 if (o
->reloc_count
== 0)
1990 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1992 if (internal_relocs
== NULL
)
1996 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1998 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2000 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2001 if (internal_relocs
== NULL
)
2005 if (external_relocs
== NULL
)
2007 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2010 external_relocs
= alloc1
;
2013 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2014 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2015 != rel_hdr
->sh_size
))
2018 /* Swap in the relocs. For convenience, we always produce an
2019 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2021 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2023 Elf_External_Rel
*erel
;
2024 Elf_External_Rel
*erelend
;
2025 Elf_Internal_Rela
*irela
;
2027 erel
= (Elf_External_Rel
*) external_relocs
;
2028 erelend
= erel
+ o
->reloc_count
;
2029 irela
= internal_relocs
;
2030 for (; erel
< erelend
; erel
++, irela
++)
2032 Elf_Internal_Rel irel
;
2034 elf_swap_reloc_in (abfd
, erel
, &irel
);
2035 irela
->r_offset
= irel
.r_offset
;
2036 irela
->r_info
= irel
.r_info
;
2037 irela
->r_addend
= 0;
2042 Elf_External_Rela
*erela
;
2043 Elf_External_Rela
*erelaend
;
2044 Elf_Internal_Rela
*irela
;
2046 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2048 erela
= (Elf_External_Rela
*) external_relocs
;
2049 erelaend
= erela
+ o
->reloc_count
;
2050 irela
= internal_relocs
;
2051 for (; erela
< erelaend
; erela
++, irela
++)
2052 elf_swap_reloca_in (abfd
, erela
, irela
);
2055 /* Cache the results for next time, if we can. */
2057 elf_section_data (o
)->relocs
= internal_relocs
;
2062 /* Don't free alloc2, since if it was allocated we are passing it
2063 back (under the name of internal_relocs). */
2065 return internal_relocs
;
2076 /* Record an assignment to a symbol made by a linker script. We need
2077 this in case some dynamic object refers to this symbol. */
2081 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2083 struct bfd_link_info
*info
;
2087 struct elf_link_hash_entry
*h
;
2089 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2092 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2096 if (h
->root
.type
== bfd_link_hash_new
)
2097 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2099 /* If this symbol is being provided by the linker script, and it is
2100 currently defined by a dynamic object, but not by a regular
2101 object, then mark it as undefined so that the generic linker will
2102 force the correct value. */
2104 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2105 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2106 h
->root
.type
= bfd_link_hash_undefined
;
2108 /* If this symbol is not being provided by the linker script, and it is
2109 currently defined by a dynamic object, but not by a regular object,
2110 then clear out any version information because the symbol will not be
2111 associated with the dynamic object any more. */
2113 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2114 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2115 h
->verinfo
.verdef
= NULL
;
2117 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2118 h
->type
= STT_OBJECT
;
2120 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2121 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2123 && h
->dynindx
== -1)
2125 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2128 /* If this is a weak defined symbol, and we know a corresponding
2129 real symbol from the same dynamic object, make sure the real
2130 symbol is also made into a dynamic symbol. */
2131 if (h
->weakdef
!= NULL
2132 && h
->weakdef
->dynindx
== -1)
2134 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2142 /* This structure is used to pass information to
2143 elf_link_assign_sym_version. */
2145 struct elf_assign_sym_version_info
2149 /* General link information. */
2150 struct bfd_link_info
*info
;
2152 struct bfd_elf_version_tree
*verdefs
;
2153 /* Whether we are exporting all dynamic symbols. */
2154 boolean export_dynamic
;
2155 /* Whether we removed any symbols from the dynamic symbol table. */
2156 boolean removed_dynamic
;
2157 /* Whether we had a failure. */
2161 /* This structure is used to pass information to
2162 elf_link_find_version_dependencies. */
2164 struct elf_find_verdep_info
2168 /* General link information. */
2169 struct bfd_link_info
*info
;
2170 /* The number of dependencies. */
2172 /* Whether we had a failure. */
2176 /* Array used to determine the number of hash table buckets to use
2177 based on the number of symbols there are. If there are fewer than
2178 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2179 fewer than 37 we use 17 buckets, and so forth. We never use more
2180 than 32771 buckets. */
2182 static const size_t elf_buckets
[] =
2184 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2188 /* Set up the sizes and contents of the ELF dynamic sections. This is
2189 called by the ELF linker emulation before_allocation routine. We
2190 must set the sizes of the sections before the linker sets the
2191 addresses of the various sections. */
2194 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2195 export_dynamic
, filter_shlib
,
2196 auxiliary_filters
, info
, sinterpptr
,
2201 boolean export_dynamic
;
2202 const char *filter_shlib
;
2203 const char * const *auxiliary_filters
;
2204 struct bfd_link_info
*info
;
2205 asection
**sinterpptr
;
2206 struct bfd_elf_version_tree
*verdefs
;
2208 bfd_size_type soname_indx
;
2210 struct elf_backend_data
*bed
;
2211 bfd_size_type old_dynsymcount
;
2212 struct elf_assign_sym_version_info asvinfo
;
2216 soname_indx
= (bfd_size_type
) -1;
2218 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2221 /* The backend may have to create some sections regardless of whether
2222 we're dynamic or not. */
2223 bed
= get_elf_backend_data (output_bfd
);
2224 if (bed
->elf_backend_always_size_sections
2225 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2228 dynobj
= elf_hash_table (info
)->dynobj
;
2230 /* If there were no dynamic objects in the link, there is nothing to
2235 /* If we are supposed to export all symbols into the dynamic symbol
2236 table (this is not the normal case), then do so. */
2239 struct elf_info_failed eif
;
2243 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2249 if (elf_hash_table (info
)->dynamic_sections_created
)
2251 struct elf_info_failed eif
;
2252 struct elf_link_hash_entry
*h
;
2253 bfd_size_type strsize
;
2255 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2256 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2260 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2261 soname
, true, true);
2262 if (soname_indx
== (bfd_size_type
) -1
2263 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2269 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2277 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2279 if (indx
== (bfd_size_type
) -1
2280 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2284 if (filter_shlib
!= NULL
)
2288 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2289 filter_shlib
, true, true);
2290 if (indx
== (bfd_size_type
) -1
2291 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2295 if (auxiliary_filters
!= NULL
)
2297 const char * const *p
;
2299 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2303 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2305 if (indx
== (bfd_size_type
) -1
2306 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2311 /* Attach all the symbols to their version information. */
2312 asvinfo
.output_bfd
= output_bfd
;
2313 asvinfo
.info
= info
;
2314 asvinfo
.verdefs
= verdefs
;
2315 asvinfo
.export_dynamic
= export_dynamic
;
2316 asvinfo
.removed_dynamic
= false;
2317 asvinfo
.failed
= false;
2319 elf_link_hash_traverse (elf_hash_table (info
),
2320 elf_link_assign_sym_version
,
2325 /* Find all symbols which were defined in a dynamic object and make
2326 the backend pick a reasonable value for them. */
2329 elf_link_hash_traverse (elf_hash_table (info
),
2330 elf_adjust_dynamic_symbol
,
2335 /* Add some entries to the .dynamic section. We fill in some of the
2336 values later, in elf_bfd_final_link, but we must add the entries
2337 now so that we know the final size of the .dynamic section. */
2338 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2341 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2342 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2344 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2347 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2350 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2351 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2353 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2356 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2357 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2358 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2359 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2360 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2361 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2362 sizeof (Elf_External_Sym
)))
2366 /* The backend must work out the sizes of all the other dynamic
2368 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2369 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2372 if (elf_hash_table (info
)->dynamic_sections_created
)
2377 size_t bucketcount
= 0;
2378 Elf_Internal_Sym isym
;
2380 /* Set up the version definition section. */
2381 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2382 BFD_ASSERT (s
!= NULL
);
2384 /* We may have created additional version definitions if we are
2385 just linking a regular application. */
2386 verdefs
= asvinfo
.verdefs
;
2388 if (verdefs
== NULL
)
2392 /* Don't include this section in the output file. */
2393 for (spp
= &output_bfd
->sections
;
2394 *spp
!= s
->output_section
;
2395 spp
= &(*spp
)->next
)
2397 *spp
= s
->output_section
->next
;
2398 --output_bfd
->section_count
;
2404 struct bfd_elf_version_tree
*t
;
2406 Elf_Internal_Verdef def
;
2407 Elf_Internal_Verdaux defaux
;
2409 if (asvinfo
.removed_dynamic
)
2411 /* Some dynamic symbols were changed to be local
2412 symbols. In this case, we renumber all of the
2413 dynamic symbols, so that we don't have a hole. If
2414 the backend changed dynsymcount, then assume that the
2415 new symbols are at the start. This is the case on
2416 the MIPS. FIXME: The names of the removed symbols
2417 will still be in the dynamic string table, wasting
2419 elf_hash_table (info
)->dynsymcount
=
2420 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2421 elf_link_hash_traverse (elf_hash_table (info
),
2422 elf_link_renumber_dynsyms
,
2429 /* Make space for the base version. */
2430 size
+= sizeof (Elf_External_Verdef
);
2431 size
+= sizeof (Elf_External_Verdaux
);
2434 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2436 struct bfd_elf_version_deps
*n
;
2438 size
+= sizeof (Elf_External_Verdef
);
2439 size
+= sizeof (Elf_External_Verdaux
);
2442 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2443 size
+= sizeof (Elf_External_Verdaux
);
2446 s
->_raw_size
= size
;
2447 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2448 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2451 /* Fill in the version definition section. */
2455 def
.vd_version
= VER_DEF_CURRENT
;
2456 def
.vd_flags
= VER_FLG_BASE
;
2459 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2460 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2461 + sizeof (Elf_External_Verdaux
));
2463 if (soname_indx
!= (bfd_size_type
) -1)
2465 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2466 defaux
.vda_name
= soname_indx
;
2473 name
= output_bfd
->filename
;
2474 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2475 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2477 if (indx
== (bfd_size_type
) -1)
2479 defaux
.vda_name
= indx
;
2481 defaux
.vda_next
= 0;
2483 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2484 (Elf_External_Verdef
*)p
);
2485 p
+= sizeof (Elf_External_Verdef
);
2486 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2487 (Elf_External_Verdaux
*) p
);
2488 p
+= sizeof (Elf_External_Verdaux
);
2490 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2493 struct bfd_elf_version_deps
*n
;
2494 struct elf_link_hash_entry
*h
;
2497 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2500 /* Add a symbol representing this version. */
2502 if (! (_bfd_generic_link_add_one_symbol
2503 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2504 (bfd_vma
) 0, (const char *) NULL
, false,
2505 get_elf_backend_data (dynobj
)->collect
,
2506 (struct bfd_link_hash_entry
**) &h
)))
2508 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2509 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2510 h
->type
= STT_OBJECT
;
2511 h
->verinfo
.vertree
= t
;
2513 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2516 def
.vd_version
= VER_DEF_CURRENT
;
2518 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2519 def
.vd_flags
|= VER_FLG_WEAK
;
2520 def
.vd_ndx
= t
->vernum
+ 1;
2521 def
.vd_cnt
= cdeps
+ 1;
2522 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2523 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2524 if (t
->next
!= NULL
)
2525 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2526 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2530 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2531 (Elf_External_Verdef
*) p
);
2532 p
+= sizeof (Elf_External_Verdef
);
2534 defaux
.vda_name
= h
->dynstr_index
;
2535 if (t
->deps
== NULL
)
2536 defaux
.vda_next
= 0;
2538 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2539 t
->name_indx
= defaux
.vda_name
;
2541 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2542 (Elf_External_Verdaux
*) p
);
2543 p
+= sizeof (Elf_External_Verdaux
);
2545 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2547 if (n
->version_needed
== NULL
)
2549 /* This can happen if there was an error in the
2551 defaux
.vda_name
= 0;
2554 defaux
.vda_name
= n
->version_needed
->name_indx
;
2555 if (n
->next
== NULL
)
2556 defaux
.vda_next
= 0;
2558 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2560 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2561 (Elf_External_Verdaux
*) p
);
2562 p
+= sizeof (Elf_External_Verdaux
);
2566 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2567 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2570 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2573 /* Work out the size of the version reference section. */
2575 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2576 BFD_ASSERT (s
!= NULL
);
2578 struct elf_find_verdep_info sinfo
;
2580 sinfo
.output_bfd
= output_bfd
;
2582 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2583 if (sinfo
.vers
== 0)
2585 sinfo
.failed
= false;
2587 elf_link_hash_traverse (elf_hash_table (info
),
2588 elf_link_find_version_dependencies
,
2591 if (elf_tdata (output_bfd
)->verref
== NULL
)
2595 /* We don't have any version definitions, so we can just
2596 remove the section. */
2598 for (spp
= &output_bfd
->sections
;
2599 *spp
!= s
->output_section
;
2600 spp
= &(*spp
)->next
)
2602 *spp
= s
->output_section
->next
;
2603 --output_bfd
->section_count
;
2607 Elf_Internal_Verneed
*t
;
2612 /* Build the version definition section. */
2615 for (t
= elf_tdata (output_bfd
)->verref
;
2619 Elf_Internal_Vernaux
*a
;
2621 size
+= sizeof (Elf_External_Verneed
);
2623 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2624 size
+= sizeof (Elf_External_Vernaux
);
2627 s
->_raw_size
= size
;
2628 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2629 if (s
->contents
== NULL
)
2633 for (t
= elf_tdata (output_bfd
)->verref
;
2638 Elf_Internal_Vernaux
*a
;
2642 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2645 t
->vn_version
= VER_NEED_CURRENT
;
2647 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2648 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2649 elf_dt_name (t
->vn_bfd
),
2652 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2653 t
->vn_bfd
->filename
, true, false);
2654 if (indx
== (bfd_size_type
) -1)
2657 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2658 if (t
->vn_nextref
== NULL
)
2661 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2662 + caux
* sizeof (Elf_External_Vernaux
));
2664 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2665 (Elf_External_Verneed
*) p
);
2666 p
+= sizeof (Elf_External_Verneed
);
2668 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2670 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2672 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2673 a
->vna_nodename
, true, false);
2674 if (indx
== (bfd_size_type
) -1)
2677 if (a
->vna_nextptr
== NULL
)
2680 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2682 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2683 (Elf_External_Vernaux
*) p
);
2684 p
+= sizeof (Elf_External_Vernaux
);
2688 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2689 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2692 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2696 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2698 /* Work out the size of the symbol version section. */
2699 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2700 BFD_ASSERT (s
!= NULL
);
2701 if (dynsymcount
== 0
2702 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2706 /* We don't need any symbol versions; just discard the
2708 for (spp
= &output_bfd
->sections
;
2709 *spp
!= s
->output_section
;
2710 spp
= &(*spp
)->next
)
2712 *spp
= s
->output_section
->next
;
2713 --output_bfd
->section_count
;
2717 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2718 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2719 if (s
->contents
== NULL
)
2722 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2726 /* Set the size of the .dynsym and .hash sections. We counted
2727 the number of dynamic symbols in elf_link_add_object_symbols.
2728 We will build the contents of .dynsym and .hash when we build
2729 the final symbol table, because until then we do not know the
2730 correct value to give the symbols. We built the .dynstr
2731 section as we went along in elf_link_add_object_symbols. */
2732 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2733 BFD_ASSERT (s
!= NULL
);
2734 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2735 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2736 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2739 /* The first entry in .dynsym is a dummy symbol. */
2746 elf_swap_symbol_out (output_bfd
, &isym
,
2747 (PTR
) (Elf_External_Sym
*) s
->contents
);
2749 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2751 bucketcount
= elf_buckets
[i
];
2752 if (dynsymcount
< elf_buckets
[i
+ 1])
2756 s
= bfd_get_section_by_name (dynobj
, ".hash");
2757 BFD_ASSERT (s
!= NULL
);
2758 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2759 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2760 if (s
->contents
== NULL
)
2762 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2764 put_word (output_bfd
, bucketcount
, s
->contents
);
2765 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2767 elf_hash_table (info
)->bucketcount
= bucketcount
;
2769 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2770 BFD_ASSERT (s
!= NULL
);
2771 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2773 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2780 /* Fix up the flags for a symbol. This handles various cases which
2781 can only be fixed after all the input files are seen. This is
2782 currently called by both adjust_dynamic_symbol and
2783 assign_sym_version, which is unnecessary but perhaps more robust in
2784 the face of future changes. */
2787 elf_fix_symbol_flags (h
, eif
)
2788 struct elf_link_hash_entry
*h
;
2789 struct elf_info_failed
*eif
;
2791 /* If this symbol was mentioned in a non-ELF file, try to set
2792 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2793 permit a non-ELF file to correctly refer to a symbol defined in
2794 an ELF dynamic object. */
2795 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2797 if (h
->root
.type
!= bfd_link_hash_defined
2798 && h
->root
.type
!= bfd_link_hash_defweak
)
2799 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2802 if (h
->root
.u
.def
.section
->owner
!= NULL
2803 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2804 == bfd_target_elf_flavour
))
2805 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2807 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2810 if (h
->dynindx
== -1
2811 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2812 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2814 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2822 /* If this is a final link, and the symbol was defined as a common
2823 symbol in a regular object file, and there was no definition in
2824 any dynamic object, then the linker will have allocated space for
2825 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2826 flag will not have been set. */
2827 if (h
->root
.type
== bfd_link_hash_defined
2828 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2829 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2830 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2831 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2832 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2834 /* If -Bsymbolic was used (which means to bind references to global
2835 symbols to the definition within the shared object), and this
2836 symbol was defined in a regular object, then it actually doesn't
2837 need a PLT entry. */
2838 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2839 && eif
->info
->shared
2840 && eif
->info
->symbolic
2841 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2842 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2847 /* Make the backend pick a good value for a dynamic symbol. This is
2848 called via elf_link_hash_traverse, and also calls itself
2852 elf_adjust_dynamic_symbol (h
, data
)
2853 struct elf_link_hash_entry
*h
;
2856 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2858 struct elf_backend_data
*bed
;
2860 /* Ignore indirect symbols. These are added by the versioning code. */
2861 if (h
->root
.type
== bfd_link_hash_indirect
)
2864 /* Fix the symbol flags. */
2865 if (! elf_fix_symbol_flags (h
, eif
))
2868 /* If this symbol does not require a PLT entry, and it is not
2869 defined by a dynamic object, or is not referenced by a regular
2870 object, ignore it. We do have to handle a weak defined symbol,
2871 even if no regular object refers to it, if we decided to add it
2872 to the dynamic symbol table. FIXME: Do we normally need to worry
2873 about symbols which are defined by one dynamic object and
2874 referenced by another one? */
2875 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2876 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2877 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2878 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2879 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2882 /* If we've already adjusted this symbol, don't do it again. This
2883 can happen via a recursive call. */
2884 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2887 /* Don't look at this symbol again. Note that we must set this
2888 after checking the above conditions, because we may look at a
2889 symbol once, decide not to do anything, and then get called
2890 recursively later after REF_REGULAR is set below. */
2891 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2893 /* If this is a weak definition, and we know a real definition, and
2894 the real symbol is not itself defined by a regular object file,
2895 then get a good value for the real definition. We handle the
2896 real symbol first, for the convenience of the backend routine.
2898 Note that there is a confusing case here. If the real definition
2899 is defined by a regular object file, we don't get the real symbol
2900 from the dynamic object, but we do get the weak symbol. If the
2901 processor backend uses a COPY reloc, then if some routine in the
2902 dynamic object changes the real symbol, we will not see that
2903 change in the corresponding weak symbol. This is the way other
2904 ELF linkers work as well, and seems to be a result of the shared
2907 I will clarify this issue. Most SVR4 shared libraries define the
2908 variable _timezone and define timezone as a weak synonym. The
2909 tzset call changes _timezone. If you write
2910 extern int timezone;
2912 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2913 you might expect that, since timezone is a synonym for _timezone,
2914 the same number will print both times. However, if the processor
2915 backend uses a COPY reloc, then actually timezone will be copied
2916 into your process image, and, since you define _timezone
2917 yourself, _timezone will not. Thus timezone and _timezone will
2918 wind up at different memory locations. The tzset call will set
2919 _timezone, leaving timezone unchanged. */
2921 if (h
->weakdef
!= NULL
)
2923 struct elf_link_hash_entry
*weakdef
;
2925 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2926 || h
->root
.type
== bfd_link_hash_defweak
);
2927 weakdef
= h
->weakdef
;
2928 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2929 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2930 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2931 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2933 /* This symbol is defined by a regular object file, so we
2934 will not do anything special. Clear weakdef for the
2935 convenience of the processor backend. */
2940 /* There is an implicit reference by a regular object file
2941 via the weak symbol. */
2942 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2943 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2948 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2949 bed
= get_elf_backend_data (dynobj
);
2950 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2959 /* This routine is used to export all defined symbols into the dynamic
2960 symbol table. It is called via elf_link_hash_traverse. */
2963 elf_export_symbol (h
, data
)
2964 struct elf_link_hash_entry
*h
;
2967 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2969 /* Ignore indirect symbols. These are added by the versioning code. */
2970 if (h
->root
.type
== bfd_link_hash_indirect
)
2973 if (h
->dynindx
== -1
2974 && (h
->elf_link_hash_flags
2975 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2977 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2987 /* Look through the symbols which are defined in other shared
2988 libraries and referenced here. Update the list of version
2989 dependencies. This will be put into the .gnu.version_r section.
2990 This function is called via elf_link_hash_traverse. */
2993 elf_link_find_version_dependencies (h
, data
)
2994 struct elf_link_hash_entry
*h
;
2997 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2998 Elf_Internal_Verneed
*t
;
2999 Elf_Internal_Vernaux
*a
;
3001 /* We only care about symbols defined in shared objects with version
3003 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3004 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3006 || h
->verinfo
.verdef
== NULL
)
3009 /* See if we already know about this version. */
3010 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3012 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3015 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3016 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3022 /* This is a new version. Add it to tree we are building. */
3026 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3029 rinfo
->failed
= true;
3033 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3034 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3035 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3038 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3040 /* Note that we are copying a string pointer here, and testing it
3041 above. If bfd_elf_string_from_elf_section is ever changed to
3042 discard the string data when low in memory, this will have to be
3044 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3046 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3047 a
->vna_nextptr
= t
->vn_auxptr
;
3049 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3052 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3059 /* Figure out appropriate versions for all the symbols. We may not
3060 have the version number script until we have read all of the input
3061 files, so until that point we don't know which symbols should be
3062 local. This function is called via elf_link_hash_traverse. */
3065 elf_link_assign_sym_version (h
, data
)
3066 struct elf_link_hash_entry
*h
;
3069 struct elf_assign_sym_version_info
*sinfo
=
3070 (struct elf_assign_sym_version_info
*) data
;
3071 struct bfd_link_info
*info
= sinfo
->info
;
3072 struct elf_info_failed eif
;
3075 /* Fix the symbol flags. */
3078 if (! elf_fix_symbol_flags (h
, &eif
))
3081 sinfo
->failed
= true;
3085 /* We only need version numbers for symbols defined in regular
3087 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3090 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3091 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3093 struct bfd_elf_version_tree
*t
;
3098 /* There are two consecutive ELF_VER_CHR characters if this is
3099 not a hidden symbol. */
3101 if (*p
== ELF_VER_CHR
)
3107 /* If there is no version string, we can just return out. */
3111 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3115 /* Look for the version. If we find it, it is no longer weak. */
3116 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3118 if (strcmp (t
->name
, p
) == 0)
3122 struct bfd_elf_version_expr
*d
;
3124 len
= p
- h
->root
.root
.string
;
3125 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3128 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3129 alc
[len
- 1] = '\0';
3130 if (alc
[len
- 2] == ELF_VER_CHR
)
3131 alc
[len
- 2] = '\0';
3133 h
->verinfo
.vertree
= t
;
3137 if (t
->globals
!= NULL
)
3139 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3141 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3142 || fnmatch (d
->match
, alc
, 0) == 0)
3147 /* See if there is anything to force this symbol to
3149 if (d
== NULL
&& t
->locals
!= NULL
)
3151 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3153 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3154 || fnmatch (d
->match
, alc
, 0) == 0)
3156 if (h
->dynindx
!= -1
3158 && ! sinfo
->export_dynamic
)
3160 sinfo
->removed_dynamic
= true;
3161 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3162 h
->elf_link_hash_flags
&=~
3163 ELF_LINK_HASH_NEEDS_PLT
;
3165 /* FIXME: The name of the symbol has
3166 already been recorded in the dynamic
3167 string table section. */
3175 bfd_release (sinfo
->output_bfd
, alc
);
3180 /* If we are building an application, we need to create a
3181 version node for this version. */
3182 if (t
== NULL
&& ! info
->shared
)
3184 struct bfd_elf_version_tree
**pp
;
3187 /* If we aren't going to export this symbol, we don't need
3188 to worry about it. */
3189 if (h
->dynindx
== -1)
3192 t
= ((struct bfd_elf_version_tree
*)
3193 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3196 sinfo
->failed
= true;
3205 t
->name_indx
= (unsigned int) -1;
3209 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3211 t
->vernum
= version_index
;
3215 h
->verinfo
.vertree
= t
;
3219 /* We could not find the version for a symbol when
3220 generating a shared archive. Return an error. */
3221 (*_bfd_error_handler
)
3222 (_("%s: undefined versioned symbol name %s"),
3223 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3224 bfd_set_error (bfd_error_bad_value
);
3225 sinfo
->failed
= true;
3230 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3233 /* If we don't have a version for this symbol, see if we can find
3235 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3237 struct bfd_elf_version_tree
*t
;
3238 struct bfd_elf_version_tree
*deflt
;
3239 struct bfd_elf_version_expr
*d
;
3241 /* See if can find what version this symbol is in. If the
3242 symbol is supposed to be local, then don't actually register
3245 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3247 if (t
->globals
!= NULL
)
3249 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3251 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3253 h
->verinfo
.vertree
= t
;
3262 if (t
->locals
!= NULL
)
3264 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3266 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3268 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3270 h
->verinfo
.vertree
= t
;
3271 if (h
->dynindx
!= -1
3273 && ! sinfo
->export_dynamic
)
3275 sinfo
->removed_dynamic
= true;
3276 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3277 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3279 /* FIXME: The name of the symbol has already
3280 been recorded in the dynamic string table
3292 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3294 h
->verinfo
.vertree
= deflt
;
3295 if (h
->dynindx
!= -1
3297 && ! sinfo
->export_dynamic
)
3299 sinfo
->removed_dynamic
= true;
3300 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3301 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3303 /* FIXME: The name of the symbol has already been
3304 recorded in the dynamic string table section. */
3312 /* This function is used to renumber the dynamic symbols, if some of
3313 them are removed because they are marked as local. This is called
3314 via elf_link_hash_traverse. */
3317 elf_link_renumber_dynsyms (h
, data
)
3318 struct elf_link_hash_entry
*h
;
3321 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3323 if (h
->dynindx
!= -1)
3325 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3326 ++elf_hash_table (info
)->dynsymcount
;
3332 /* Final phase of ELF linker. */
3334 /* A structure we use to avoid passing large numbers of arguments. */
3336 struct elf_final_link_info
3338 /* General link information. */
3339 struct bfd_link_info
*info
;
3342 /* Symbol string table. */
3343 struct bfd_strtab_hash
*symstrtab
;
3344 /* .dynsym section. */
3345 asection
*dynsym_sec
;
3346 /* .hash section. */
3348 /* symbol version section (.gnu.version). */
3349 asection
*symver_sec
;
3350 /* Buffer large enough to hold contents of any section. */
3352 /* Buffer large enough to hold external relocs of any section. */
3353 PTR external_relocs
;
3354 /* Buffer large enough to hold internal relocs of any section. */
3355 Elf_Internal_Rela
*internal_relocs
;
3356 /* Buffer large enough to hold external local symbols of any input
3358 Elf_External_Sym
*external_syms
;
3359 /* Buffer large enough to hold internal local symbols of any input
3361 Elf_Internal_Sym
*internal_syms
;
3362 /* Array large enough to hold a symbol index for each local symbol
3363 of any input BFD. */
3365 /* Array large enough to hold a section pointer for each local
3366 symbol of any input BFD. */
3367 asection
**sections
;
3368 /* Buffer to hold swapped out symbols. */
3369 Elf_External_Sym
*symbuf
;
3370 /* Number of swapped out symbols in buffer. */
3371 size_t symbuf_count
;
3372 /* Number of symbols which fit in symbuf. */
3376 static boolean elf_link_output_sym
3377 PARAMS ((struct elf_final_link_info
*, const char *,
3378 Elf_Internal_Sym
*, asection
*));
3379 static boolean elf_link_flush_output_syms
3380 PARAMS ((struct elf_final_link_info
*));
3381 static boolean elf_link_output_extsym
3382 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3383 static boolean elf_link_input_bfd
3384 PARAMS ((struct elf_final_link_info
*, bfd
*));
3385 static boolean elf_reloc_link_order
3386 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3387 struct bfd_link_order
*));
3389 /* This struct is used to pass information to elf_link_output_extsym. */
3391 struct elf_outext_info
3395 struct elf_final_link_info
*finfo
;
3398 /* Do the final step of an ELF link. */
3401 elf_bfd_final_link (abfd
, info
)
3403 struct bfd_link_info
*info
;
3407 struct elf_final_link_info finfo
;
3408 register asection
*o
;
3409 register struct bfd_link_order
*p
;
3411 size_t max_contents_size
;
3412 size_t max_external_reloc_size
;
3413 size_t max_internal_reloc_count
;
3414 size_t max_sym_count
;
3416 Elf_Internal_Sym elfsym
;
3418 Elf_Internal_Shdr
*symtab_hdr
;
3419 Elf_Internal_Shdr
*symstrtab_hdr
;
3420 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3421 struct elf_outext_info eoinfo
;
3424 abfd
->flags
|= DYNAMIC
;
3426 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3427 dynobj
= elf_hash_table (info
)->dynobj
;
3430 finfo
.output_bfd
= abfd
;
3431 finfo
.symstrtab
= elf_stringtab_init ();
3432 if (finfo
.symstrtab
== NULL
)
3437 finfo
.dynsym_sec
= NULL
;
3438 finfo
.hash_sec
= NULL
;
3439 finfo
.symver_sec
= NULL
;
3443 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3444 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3445 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3446 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3447 /* Note that it is OK if symver_sec is NULL. */
3450 finfo
.contents
= NULL
;
3451 finfo
.external_relocs
= NULL
;
3452 finfo
.internal_relocs
= NULL
;
3453 finfo
.external_syms
= NULL
;
3454 finfo
.internal_syms
= NULL
;
3455 finfo
.indices
= NULL
;
3456 finfo
.sections
= NULL
;
3457 finfo
.symbuf
= NULL
;
3458 finfo
.symbuf_count
= 0;
3460 /* Count up the number of relocations we will output for each output
3461 section, so that we know the sizes of the reloc sections. We
3462 also figure out some maximum sizes. */
3463 max_contents_size
= 0;
3464 max_external_reloc_size
= 0;
3465 max_internal_reloc_count
= 0;
3467 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3471 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3473 if (p
->type
== bfd_section_reloc_link_order
3474 || p
->type
== bfd_symbol_reloc_link_order
)
3476 else if (p
->type
== bfd_indirect_link_order
)
3480 sec
= p
->u
.indirect
.section
;
3482 /* Mark all sections which are to be included in the
3483 link. This will normally be every section. We need
3484 to do this so that we can identify any sections which
3485 the linker has decided to not include. */
3486 sec
->linker_mark
= true;
3488 if (info
->relocateable
)
3489 o
->reloc_count
+= sec
->reloc_count
;
3491 if (sec
->_raw_size
> max_contents_size
)
3492 max_contents_size
= sec
->_raw_size
;
3493 if (sec
->_cooked_size
> max_contents_size
)
3494 max_contents_size
= sec
->_cooked_size
;
3496 /* We are interested in just local symbols, not all
3498 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3499 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3503 if (elf_bad_symtab (sec
->owner
))
3504 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3505 / sizeof (Elf_External_Sym
));
3507 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3509 if (sym_count
> max_sym_count
)
3510 max_sym_count
= sym_count
;
3512 if ((sec
->flags
& SEC_RELOC
) != 0)
3516 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3517 if (ext_size
> max_external_reloc_size
)
3518 max_external_reloc_size
= ext_size
;
3519 if (sec
->reloc_count
> max_internal_reloc_count
)
3520 max_internal_reloc_count
= sec
->reloc_count
;
3526 if (o
->reloc_count
> 0)
3527 o
->flags
|= SEC_RELOC
;
3530 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3531 set it (this is probably a bug) and if it is set
3532 assign_section_numbers will create a reloc section. */
3533 o
->flags
&=~ SEC_RELOC
;
3536 /* If the SEC_ALLOC flag is not set, force the section VMA to
3537 zero. This is done in elf_fake_sections as well, but forcing
3538 the VMA to 0 here will ensure that relocs against these
3539 sections are handled correctly. */
3540 if ((o
->flags
& SEC_ALLOC
) == 0
3541 && ! o
->user_set_vma
)
3545 /* Figure out the file positions for everything but the symbol table
3546 and the relocs. We set symcount to force assign_section_numbers
3547 to create a symbol table. */
3548 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3549 BFD_ASSERT (! abfd
->output_has_begun
);
3550 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3553 /* That created the reloc sections. Set their sizes, and assign
3554 them file positions, and allocate some buffers. */
3555 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3557 if ((o
->flags
& SEC_RELOC
) != 0)
3559 Elf_Internal_Shdr
*rel_hdr
;
3560 register struct elf_link_hash_entry
**p
, **pend
;
3562 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3564 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3566 /* The contents field must last into write_object_contents,
3567 so we allocate it with bfd_alloc rather than malloc. */
3568 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3569 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3572 p
= ((struct elf_link_hash_entry
**)
3573 bfd_malloc (o
->reloc_count
3574 * sizeof (struct elf_link_hash_entry
*)));
3575 if (p
== NULL
&& o
->reloc_count
!= 0)
3577 elf_section_data (o
)->rel_hashes
= p
;
3578 pend
= p
+ o
->reloc_count
;
3579 for (; p
< pend
; p
++)
3582 /* Use the reloc_count field as an index when outputting the
3588 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3590 /* We have now assigned file positions for all the sections except
3591 .symtab and .strtab. We start the .symtab section at the current
3592 file position, and write directly to it. We build the .strtab
3593 section in memory. */
3595 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3596 /* sh_name is set in prep_headers. */
3597 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3598 symtab_hdr
->sh_flags
= 0;
3599 symtab_hdr
->sh_addr
= 0;
3600 symtab_hdr
->sh_size
= 0;
3601 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3602 /* sh_link is set in assign_section_numbers. */
3603 /* sh_info is set below. */
3604 /* sh_offset is set just below. */
3605 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3607 off
= elf_tdata (abfd
)->next_file_pos
;
3608 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3610 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3611 incorrect. We do not yet know the size of the .symtab section.
3612 We correct next_file_pos below, after we do know the size. */
3614 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3615 continuously seeking to the right position in the file. */
3616 if (! info
->keep_memory
|| max_sym_count
< 20)
3617 finfo
.symbuf_size
= 20;
3619 finfo
.symbuf_size
= max_sym_count
;
3620 finfo
.symbuf
= ((Elf_External_Sym
*)
3621 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3622 if (finfo
.symbuf
== NULL
)
3625 /* Start writing out the symbol table. The first symbol is always a
3627 if (info
->strip
!= strip_all
|| info
->relocateable
)
3629 elfsym
.st_value
= 0;
3632 elfsym
.st_other
= 0;
3633 elfsym
.st_shndx
= SHN_UNDEF
;
3634 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3635 &elfsym
, bfd_und_section_ptr
))
3640 /* Some standard ELF linkers do this, but we don't because it causes
3641 bootstrap comparison failures. */
3642 /* Output a file symbol for the output file as the second symbol.
3643 We output this even if we are discarding local symbols, although
3644 I'm not sure if this is correct. */
3645 elfsym
.st_value
= 0;
3647 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3648 elfsym
.st_other
= 0;
3649 elfsym
.st_shndx
= SHN_ABS
;
3650 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3651 &elfsym
, bfd_abs_section_ptr
))
3655 /* Output a symbol for each section. We output these even if we are
3656 discarding local symbols, since they are used for relocs. These
3657 symbols have no names. We store the index of each one in the
3658 index field of the section, so that we can find it again when
3659 outputting relocs. */
3660 if (info
->strip
!= strip_all
|| info
->relocateable
)
3663 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3664 elfsym
.st_other
= 0;
3665 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3667 o
= section_from_elf_index (abfd
, i
);
3669 o
->target_index
= abfd
->symcount
;
3670 elfsym
.st_shndx
= i
;
3671 if (info
->relocateable
|| o
== NULL
)
3672 elfsym
.st_value
= 0;
3674 elfsym
.st_value
= o
->vma
;
3675 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3681 /* Allocate some memory to hold information read in from the input
3683 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3684 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3685 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3686 bfd_malloc (max_internal_reloc_count
3687 * sizeof (Elf_Internal_Rela
)));
3688 finfo
.external_syms
= ((Elf_External_Sym
*)
3689 bfd_malloc (max_sym_count
3690 * sizeof (Elf_External_Sym
)));
3691 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3692 bfd_malloc (max_sym_count
3693 * sizeof (Elf_Internal_Sym
)));
3694 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3695 finfo
.sections
= ((asection
**)
3696 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3697 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3698 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3699 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3700 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3701 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3702 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3703 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3706 /* Since ELF permits relocations to be against local symbols, we
3707 must have the local symbols available when we do the relocations.
3708 Since we would rather only read the local symbols once, and we
3709 would rather not keep them in memory, we handle all the
3710 relocations for a single input file at the same time.
3712 Unfortunately, there is no way to know the total number of local
3713 symbols until we have seen all of them, and the local symbol
3714 indices precede the global symbol indices. This means that when
3715 we are generating relocateable output, and we see a reloc against
3716 a global symbol, we can not know the symbol index until we have
3717 finished examining all the local symbols to see which ones we are
3718 going to output. To deal with this, we keep the relocations in
3719 memory, and don't output them until the end of the link. This is
3720 an unfortunate waste of memory, but I don't see a good way around
3721 it. Fortunately, it only happens when performing a relocateable
3722 link, which is not the common case. FIXME: If keep_memory is set
3723 we could write the relocs out and then read them again; I don't
3724 know how bad the memory loss will be. */
3726 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3727 sub
->output_has_begun
= false;
3728 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3730 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3732 if (p
->type
== bfd_indirect_link_order
3733 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3734 == bfd_target_elf_flavour
))
3736 sub
= p
->u
.indirect
.section
->owner
;
3737 if (! sub
->output_has_begun
)
3739 if (! elf_link_input_bfd (&finfo
, sub
))
3741 sub
->output_has_begun
= true;
3744 else if (p
->type
== bfd_section_reloc_link_order
3745 || p
->type
== bfd_symbol_reloc_link_order
)
3747 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3752 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3758 /* That wrote out all the local symbols. Finish up the symbol table
3759 with the global symbols. */
3761 if (info
->strip
!= strip_all
&& info
->shared
)
3763 /* Output any global symbols that got converted to local in a
3764 version script. We do this in a separate step since ELF
3765 requires all local symbols to appear prior to any global
3766 symbols. FIXME: We should only do this if some global
3767 symbols were, in fact, converted to become local. FIXME:
3768 Will this work correctly with the Irix 5 linker? */
3769 eoinfo
.failed
= false;
3770 eoinfo
.finfo
= &finfo
;
3771 eoinfo
.localsyms
= true;
3772 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3778 /* The sh_info field records the index of the first non local
3780 symtab_hdr
->sh_info
= abfd
->symcount
;
3782 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3784 /* We get the global symbols from the hash table. */
3785 eoinfo
.failed
= false;
3786 eoinfo
.localsyms
= false;
3787 eoinfo
.finfo
= &finfo
;
3788 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3793 /* Flush all symbols to the file. */
3794 if (! elf_link_flush_output_syms (&finfo
))
3797 /* Now we know the size of the symtab section. */
3798 off
+= symtab_hdr
->sh_size
;
3800 /* Finish up and write out the symbol string table (.strtab)
3802 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3803 /* sh_name was set in prep_headers. */
3804 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3805 symstrtab_hdr
->sh_flags
= 0;
3806 symstrtab_hdr
->sh_addr
= 0;
3807 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3808 symstrtab_hdr
->sh_entsize
= 0;
3809 symstrtab_hdr
->sh_link
= 0;
3810 symstrtab_hdr
->sh_info
= 0;
3811 /* sh_offset is set just below. */
3812 symstrtab_hdr
->sh_addralign
= 1;
3814 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3815 elf_tdata (abfd
)->next_file_pos
= off
;
3817 if (abfd
->symcount
> 0)
3819 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3820 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3824 /* Adjust the relocs to have the correct symbol indices. */
3825 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3827 struct elf_link_hash_entry
**rel_hash
;
3828 Elf_Internal_Shdr
*rel_hdr
;
3830 if ((o
->flags
& SEC_RELOC
) == 0)
3833 rel_hash
= elf_section_data (o
)->rel_hashes
;
3834 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3835 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3837 if (*rel_hash
== NULL
)
3840 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3842 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3844 Elf_External_Rel
*erel
;
3845 Elf_Internal_Rel irel
;
3847 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3848 elf_swap_reloc_in (abfd
, erel
, &irel
);
3849 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3850 ELF_R_TYPE (irel
.r_info
));
3851 elf_swap_reloc_out (abfd
, &irel
, erel
);
3855 Elf_External_Rela
*erela
;
3856 Elf_Internal_Rela irela
;
3858 BFD_ASSERT (rel_hdr
->sh_entsize
3859 == sizeof (Elf_External_Rela
));
3861 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3862 elf_swap_reloca_in (abfd
, erela
, &irela
);
3863 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3864 ELF_R_TYPE (irela
.r_info
));
3865 elf_swap_reloca_out (abfd
, &irela
, erela
);
3869 /* Set the reloc_count field to 0 to prevent write_relocs from
3870 trying to swap the relocs out itself. */
3874 /* If we are linking against a dynamic object, or generating a
3875 shared library, finish up the dynamic linking information. */
3878 Elf_External_Dyn
*dyncon
, *dynconend
;
3880 /* Fix up .dynamic entries. */
3881 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3882 BFD_ASSERT (o
!= NULL
);
3884 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3885 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3886 for (; dyncon
< dynconend
; dyncon
++)
3888 Elf_Internal_Dyn dyn
;
3892 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3899 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3900 magic _init and _fini symbols. This is pretty ugly,
3901 but we are compatible. */
3909 struct elf_link_hash_entry
*h
;
3911 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3912 false, false, true);
3914 && (h
->root
.type
== bfd_link_hash_defined
3915 || h
->root
.type
== bfd_link_hash_defweak
))
3917 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3918 o
= h
->root
.u
.def
.section
;
3919 if (o
->output_section
!= NULL
)
3920 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3921 + o
->output_offset
);
3924 /* The symbol is imported from another shared
3925 library and does not apply to this one. */
3929 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3944 name
= ".gnu.version_d";
3947 name
= ".gnu.version_r";
3950 name
= ".gnu.version";
3952 o
= bfd_get_section_by_name (abfd
, name
);
3953 BFD_ASSERT (o
!= NULL
);
3954 dyn
.d_un
.d_ptr
= o
->vma
;
3955 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3962 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3967 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3969 Elf_Internal_Shdr
*hdr
;
3971 hdr
= elf_elfsections (abfd
)[i
];
3972 if (hdr
->sh_type
== type
3973 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3975 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3976 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3979 if (dyn
.d_un
.d_val
== 0
3980 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3981 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3985 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3991 /* If we have created any dynamic sections, then output them. */
3994 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3997 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3999 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4000 || o
->_raw_size
== 0)
4002 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4004 /* At this point, we are only interested in sections
4005 created by elf_link_create_dynamic_sections. */
4008 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4010 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4012 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4013 o
->contents
, o
->output_offset
,
4021 /* The contents of the .dynstr section are actually in a
4023 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4024 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4025 || ! _bfd_stringtab_emit (abfd
,
4026 elf_hash_table (info
)->dynstr
))
4032 /* If we have optimized stabs strings, output them. */
4033 if (elf_hash_table (info
)->stab_info
!= NULL
)
4035 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4039 if (finfo
.symstrtab
!= NULL
)
4040 _bfd_stringtab_free (finfo
.symstrtab
);
4041 if (finfo
.contents
!= NULL
)
4042 free (finfo
.contents
);
4043 if (finfo
.external_relocs
!= NULL
)
4044 free (finfo
.external_relocs
);
4045 if (finfo
.internal_relocs
!= NULL
)
4046 free (finfo
.internal_relocs
);
4047 if (finfo
.external_syms
!= NULL
)
4048 free (finfo
.external_syms
);
4049 if (finfo
.internal_syms
!= NULL
)
4050 free (finfo
.internal_syms
);
4051 if (finfo
.indices
!= NULL
)
4052 free (finfo
.indices
);
4053 if (finfo
.sections
!= NULL
)
4054 free (finfo
.sections
);
4055 if (finfo
.symbuf
!= NULL
)
4056 free (finfo
.symbuf
);
4057 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4059 if ((o
->flags
& SEC_RELOC
) != 0
4060 && elf_section_data (o
)->rel_hashes
!= NULL
)
4061 free (elf_section_data (o
)->rel_hashes
);
4064 elf_tdata (abfd
)->linker
= true;
4069 if (finfo
.symstrtab
!= NULL
)
4070 _bfd_stringtab_free (finfo
.symstrtab
);
4071 if (finfo
.contents
!= NULL
)
4072 free (finfo
.contents
);
4073 if (finfo
.external_relocs
!= NULL
)
4074 free (finfo
.external_relocs
);
4075 if (finfo
.internal_relocs
!= NULL
)
4076 free (finfo
.internal_relocs
);
4077 if (finfo
.external_syms
!= NULL
)
4078 free (finfo
.external_syms
);
4079 if (finfo
.internal_syms
!= NULL
)
4080 free (finfo
.internal_syms
);
4081 if (finfo
.indices
!= NULL
)
4082 free (finfo
.indices
);
4083 if (finfo
.sections
!= NULL
)
4084 free (finfo
.sections
);
4085 if (finfo
.symbuf
!= NULL
)
4086 free (finfo
.symbuf
);
4087 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4089 if ((o
->flags
& SEC_RELOC
) != 0
4090 && elf_section_data (o
)->rel_hashes
!= NULL
)
4091 free (elf_section_data (o
)->rel_hashes
);
4097 /* Add a symbol to the output symbol table. */
4100 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4101 struct elf_final_link_info
*finfo
;
4103 Elf_Internal_Sym
*elfsym
;
4104 asection
*input_sec
;
4106 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4107 struct bfd_link_info
*info
,
4112 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4113 elf_backend_link_output_symbol_hook
;
4114 if (output_symbol_hook
!= NULL
)
4116 if (! ((*output_symbol_hook
)
4117 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4121 if (name
== (const char *) NULL
|| *name
== '\0')
4122 elfsym
->st_name
= 0;
4125 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4128 if (elfsym
->st_name
== (unsigned long) -1)
4132 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4134 if (! elf_link_flush_output_syms (finfo
))
4138 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4139 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4140 ++finfo
->symbuf_count
;
4142 ++finfo
->output_bfd
->symcount
;
4147 /* Flush the output symbols to the file. */
4150 elf_link_flush_output_syms (finfo
)
4151 struct elf_final_link_info
*finfo
;
4153 if (finfo
->symbuf_count
> 0)
4155 Elf_Internal_Shdr
*symtab
;
4157 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4159 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4161 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4162 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4163 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4166 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4168 finfo
->symbuf_count
= 0;
4174 /* Add an external symbol to the symbol table. This is called from
4175 the hash table traversal routine. When generating a shared object,
4176 we go through the symbol table twice. The first time we output
4177 anything that might have been forced to local scope in a version
4178 script. The second time we output the symbols that are still
4182 elf_link_output_extsym (h
, data
)
4183 struct elf_link_hash_entry
*h
;
4186 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4187 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4189 Elf_Internal_Sym sym
;
4190 asection
*input_sec
;
4192 /* Decide whether to output this symbol in this pass. */
4193 if (eoinfo
->localsyms
)
4195 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4200 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4204 /* If we are not creating a shared library, and this symbol is
4205 referenced by a shared library but is not defined anywhere, then
4206 warn that it is undefined. If we do not do this, the runtime
4207 linker will complain that the symbol is undefined when the
4208 program is run. We don't have to worry about symbols that are
4209 referenced by regular files, because we will already have issued
4210 warnings for them. */
4211 if (! finfo
->info
->relocateable
4212 && ! finfo
->info
->shared
4213 && h
->root
.type
== bfd_link_hash_undefined
4214 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4215 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4217 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4218 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4219 (asection
*) NULL
, 0)))
4221 eoinfo
->failed
= true;
4226 /* We don't want to output symbols that have never been mentioned by
4227 a regular file, or that we have been told to strip. However, if
4228 h->indx is set to -2, the symbol is used by a reloc and we must
4232 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4233 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4234 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4235 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4237 else if (finfo
->info
->strip
== strip_all
4238 || (finfo
->info
->strip
== strip_some
4239 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4240 h
->root
.root
.string
,
4241 false, false) == NULL
))
4246 /* If we're stripping it, and it's not a dynamic symbol, there's
4247 nothing else to do. */
4248 if (strip
&& h
->dynindx
== -1)
4252 sym
.st_size
= h
->size
;
4253 sym
.st_other
= h
->other
;
4254 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4255 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4256 else if (h
->root
.type
== bfd_link_hash_undefweak
4257 || h
->root
.type
== bfd_link_hash_defweak
)
4258 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4260 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4262 switch (h
->root
.type
)
4265 case bfd_link_hash_new
:
4269 case bfd_link_hash_undefined
:
4270 input_sec
= bfd_und_section_ptr
;
4271 sym
.st_shndx
= SHN_UNDEF
;
4274 case bfd_link_hash_undefweak
:
4275 input_sec
= bfd_und_section_ptr
;
4276 sym
.st_shndx
= SHN_UNDEF
;
4279 case bfd_link_hash_defined
:
4280 case bfd_link_hash_defweak
:
4282 input_sec
= h
->root
.u
.def
.section
;
4283 if (input_sec
->output_section
!= NULL
)
4286 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4287 input_sec
->output_section
);
4288 if (sym
.st_shndx
== (unsigned short) -1)
4290 (*_bfd_error_handler
)
4291 (_("%s: could not find output section %s for input section %s"),
4292 bfd_get_filename (finfo
->output_bfd
),
4293 input_sec
->output_section
->name
,
4295 eoinfo
->failed
= true;
4299 /* ELF symbols in relocateable files are section relative,
4300 but in nonrelocateable files they are virtual
4302 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4303 if (! finfo
->info
->relocateable
)
4304 sym
.st_value
+= input_sec
->output_section
->vma
;
4308 BFD_ASSERT (input_sec
->owner
== NULL
4309 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4310 sym
.st_shndx
= SHN_UNDEF
;
4311 input_sec
= bfd_und_section_ptr
;
4316 case bfd_link_hash_common
:
4317 input_sec
= h
->root
.u
.c
.p
->section
;
4318 sym
.st_shndx
= SHN_COMMON
;
4319 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4322 case bfd_link_hash_indirect
:
4323 /* These symbols are created by symbol versioning. They point
4324 to the decorated version of the name. For example, if the
4325 symbol foo@@GNU_1.2 is the default, which should be used when
4326 foo is used with no version, then we add an indirect symbol
4327 foo which points to foo@@GNU_1.2. We ignore these symbols,
4328 since the indirected symbol is already in the hash table. If
4329 the indirect symbol is non-ELF, fall through and output it. */
4330 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4334 case bfd_link_hash_warning
:
4335 /* We can't represent these symbols in ELF, although a warning
4336 symbol may have come from a .gnu.warning.SYMBOL section. We
4337 just put the target symbol in the hash table. If the target
4338 symbol does not really exist, don't do anything. */
4339 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4341 return (elf_link_output_extsym
4342 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4345 /* Give the processor backend a chance to tweak the symbol value,
4346 and also to finish up anything that needs to be done for this
4348 if ((h
->dynindx
!= -1
4349 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4350 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4352 struct elf_backend_data
*bed
;
4354 bed
= get_elf_backend_data (finfo
->output_bfd
);
4355 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4356 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4358 eoinfo
->failed
= true;
4363 /* If this symbol should be put in the .dynsym section, then put it
4364 there now. We have already know the symbol index. We also fill
4365 in the entry in the .hash section. */
4366 if (h
->dynindx
!= -1
4367 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4373 bfd_byte
*bucketpos
;
4376 sym
.st_name
= h
->dynstr_index
;
4378 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4379 (PTR
) (((Elf_External_Sym
*)
4380 finfo
->dynsym_sec
->contents
)
4383 /* We didn't include the version string in the dynamic string
4384 table, so we must not consider it in the hash table. */
4385 name
= h
->root
.root
.string
;
4386 p
= strchr (name
, ELF_VER_CHR
);
4391 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4392 strncpy (copy
, name
, p
- name
);
4393 copy
[p
- name
] = '\0';
4397 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4398 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4399 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4400 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4401 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4402 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4403 put_word (finfo
->output_bfd
, chain
,
4404 ((bfd_byte
*) finfo
->hash_sec
->contents
4405 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4408 bfd_release (finfo
->output_bfd
, copy
);
4410 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4412 Elf_Internal_Versym iversym
;
4414 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4416 if (h
->verinfo
.verdef
== NULL
)
4417 iversym
.vs_vers
= 0;
4419 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4423 if (h
->verinfo
.vertree
== NULL
)
4424 iversym
.vs_vers
= 1;
4426 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4429 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4430 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4432 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4433 (((Elf_External_Versym
*)
4434 finfo
->symver_sec
->contents
)
4439 /* If we're stripping it, then it was just a dynamic symbol, and
4440 there's nothing else to do. */
4444 h
->indx
= finfo
->output_bfd
->symcount
;
4446 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4448 eoinfo
->failed
= true;
4455 /* Link an input file into the linker output file. This function
4456 handles all the sections and relocations of the input file at once.
4457 This is so that we only have to read the local symbols once, and
4458 don't have to keep them in memory. */
4461 elf_link_input_bfd (finfo
, input_bfd
)
4462 struct elf_final_link_info
*finfo
;
4465 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4466 bfd
*, asection
*, bfd_byte
*,
4467 Elf_Internal_Rela
*,
4468 Elf_Internal_Sym
*, asection
**));
4470 Elf_Internal_Shdr
*symtab_hdr
;
4473 Elf_External_Sym
*external_syms
;
4474 Elf_External_Sym
*esym
;
4475 Elf_External_Sym
*esymend
;
4476 Elf_Internal_Sym
*isym
;
4478 asection
**ppsection
;
4481 output_bfd
= finfo
->output_bfd
;
4483 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4485 /* If this is a dynamic object, we don't want to do anything here:
4486 we don't want the local symbols, and we don't want the section
4488 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4491 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4492 if (elf_bad_symtab (input_bfd
))
4494 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4499 locsymcount
= symtab_hdr
->sh_info
;
4500 extsymoff
= symtab_hdr
->sh_info
;
4503 /* Read the local symbols. */
4504 if (symtab_hdr
->contents
!= NULL
)
4505 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4506 else if (locsymcount
== 0)
4507 external_syms
= NULL
;
4510 external_syms
= finfo
->external_syms
;
4511 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4512 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4513 locsymcount
, input_bfd
)
4514 != locsymcount
* sizeof (Elf_External_Sym
)))
4518 /* Swap in the local symbols and write out the ones which we know
4519 are going into the output file. */
4520 esym
= external_syms
;
4521 esymend
= esym
+ locsymcount
;
4522 isym
= finfo
->internal_syms
;
4523 pindex
= finfo
->indices
;
4524 ppsection
= finfo
->sections
;
4525 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4529 Elf_Internal_Sym osym
;
4531 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4534 if (elf_bad_symtab (input_bfd
))
4536 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4543 if (isym
->st_shndx
== SHN_UNDEF
)
4544 isec
= bfd_und_section_ptr
;
4545 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4546 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4547 else if (isym
->st_shndx
== SHN_ABS
)
4548 isec
= bfd_abs_section_ptr
;
4549 else if (isym
->st_shndx
== SHN_COMMON
)
4550 isec
= bfd_com_section_ptr
;
4559 /* Don't output the first, undefined, symbol. */
4560 if (esym
== external_syms
)
4563 /* If we are stripping all symbols, we don't want to output this
4565 if (finfo
->info
->strip
== strip_all
)
4568 /* We never output section symbols. Instead, we use the section
4569 symbol of the corresponding section in the output file. */
4570 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4573 /* If we are discarding all local symbols, we don't want to
4574 output this one. If we are generating a relocateable output
4575 file, then some of the local symbols may be required by
4576 relocs; we output them below as we discover that they are
4578 if (finfo
->info
->discard
== discard_all
)
4581 /* If this symbol is defined in a section which we are
4582 discarding, we don't need to keep it, but note that
4583 linker_mark is only reliable for sections that have contents.
4584 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4585 as well as linker_mark. */
4586 if (isym
->st_shndx
> 0
4587 && isym
->st_shndx
< SHN_LORESERVE
4589 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4590 || (! finfo
->info
->relocateable
4591 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4594 /* Get the name of the symbol. */
4595 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4600 /* See if we are discarding symbols with this name. */
4601 if ((finfo
->info
->strip
== strip_some
4602 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4604 || (finfo
->info
->discard
== discard_l
4605 && bfd_is_local_label_name (input_bfd
, name
)))
4608 /* If we get here, we are going to output this symbol. */
4612 /* Adjust the section index for the output file. */
4613 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4614 isec
->output_section
);
4615 if (osym
.st_shndx
== (unsigned short) -1)
4618 *pindex
= output_bfd
->symcount
;
4620 /* ELF symbols in relocateable files are section relative, but
4621 in executable files they are virtual addresses. Note that
4622 this code assumes that all ELF sections have an associated
4623 BFD section with a reasonable value for output_offset; below
4624 we assume that they also have a reasonable value for
4625 output_section. Any special sections must be set up to meet
4626 these requirements. */
4627 osym
.st_value
+= isec
->output_offset
;
4628 if (! finfo
->info
->relocateable
)
4629 osym
.st_value
+= isec
->output_section
->vma
;
4631 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4635 /* Relocate the contents of each section. */
4636 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4640 if (! o
->linker_mark
)
4642 /* This section was omitted from the link. */
4646 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4647 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4650 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4652 /* Section was created by elf_link_create_dynamic_sections
4657 /* Get the contents of the section. They have been cached by a
4658 relaxation routine. Note that o is a section in an input
4659 file, so the contents field will not have been set by any of
4660 the routines which work on output files. */
4661 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4662 contents
= elf_section_data (o
)->this_hdr
.contents
;
4665 contents
= finfo
->contents
;
4666 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4667 (file_ptr
) 0, o
->_raw_size
))
4671 if ((o
->flags
& SEC_RELOC
) != 0)
4673 Elf_Internal_Rela
*internal_relocs
;
4675 /* Get the swapped relocs. */
4676 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4677 (input_bfd
, o
, finfo
->external_relocs
,
4678 finfo
->internal_relocs
, false));
4679 if (internal_relocs
== NULL
4680 && o
->reloc_count
> 0)
4683 /* Relocate the section by invoking a back end routine.
4685 The back end routine is responsible for adjusting the
4686 section contents as necessary, and (if using Rela relocs
4687 and generating a relocateable output file) adjusting the
4688 reloc addend as necessary.
4690 The back end routine does not have to worry about setting
4691 the reloc address or the reloc symbol index.
4693 The back end routine is given a pointer to the swapped in
4694 internal symbols, and can access the hash table entries
4695 for the external symbols via elf_sym_hashes (input_bfd).
4697 When generating relocateable output, the back end routine
4698 must handle STB_LOCAL/STT_SECTION symbols specially. The
4699 output symbol is going to be a section symbol
4700 corresponding to the output section, which will require
4701 the addend to be adjusted. */
4703 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4704 input_bfd
, o
, contents
,
4706 finfo
->internal_syms
,
4710 if (finfo
->info
->relocateable
)
4712 Elf_Internal_Rela
*irela
;
4713 Elf_Internal_Rela
*irelaend
;
4714 struct elf_link_hash_entry
**rel_hash
;
4715 Elf_Internal_Shdr
*input_rel_hdr
;
4716 Elf_Internal_Shdr
*output_rel_hdr
;
4718 /* Adjust the reloc addresses and symbol indices. */
4720 irela
= internal_relocs
;
4721 irelaend
= irela
+ o
->reloc_count
;
4722 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4723 + o
->output_section
->reloc_count
);
4724 for (; irela
< irelaend
; irela
++, rel_hash
++)
4726 unsigned long r_symndx
;
4727 Elf_Internal_Sym
*isym
;
4730 irela
->r_offset
+= o
->output_offset
;
4732 r_symndx
= ELF_R_SYM (irela
->r_info
);
4737 if (r_symndx
>= locsymcount
4738 || (elf_bad_symtab (input_bfd
)
4739 && finfo
->sections
[r_symndx
] == NULL
))
4741 struct elf_link_hash_entry
*rh
;
4744 /* This is a reloc against a global symbol. We
4745 have not yet output all the local symbols, so
4746 we do not know the symbol index of any global
4747 symbol. We set the rel_hash entry for this
4748 reloc to point to the global hash table entry
4749 for this symbol. The symbol index is then
4750 set at the end of elf_bfd_final_link. */
4751 indx
= r_symndx
- extsymoff
;
4752 rh
= elf_sym_hashes (input_bfd
)[indx
];
4753 while (rh
->root
.type
== bfd_link_hash_indirect
4754 || rh
->root
.type
== bfd_link_hash_warning
)
4755 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
4757 /* Setting the index to -2 tells
4758 elf_link_output_extsym that this symbol is
4760 BFD_ASSERT (rh
->indx
< 0);
4768 /* This is a reloc against a local symbol. */
4771 isym
= finfo
->internal_syms
+ r_symndx
;
4772 sec
= finfo
->sections
[r_symndx
];
4773 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4775 /* I suppose the backend ought to fill in the
4776 section of any STT_SECTION symbol against a
4777 processor specific section. If we have
4778 discarded a section, the output_section will
4779 be the absolute section. */
4781 && (bfd_is_abs_section (sec
)
4782 || (sec
->output_section
!= NULL
4783 && bfd_is_abs_section (sec
->output_section
))))
4785 else if (sec
== NULL
|| sec
->owner
== NULL
)
4787 bfd_set_error (bfd_error_bad_value
);
4792 r_symndx
= sec
->output_section
->target_index
;
4793 BFD_ASSERT (r_symndx
!= 0);
4798 if (finfo
->indices
[r_symndx
] == -1)
4804 if (finfo
->info
->strip
== strip_all
)
4806 /* You can't do ld -r -s. */
4807 bfd_set_error (bfd_error_invalid_operation
);
4811 /* This symbol was skipped earlier, but
4812 since it is needed by a reloc, we
4813 must output it now. */
4814 link
= symtab_hdr
->sh_link
;
4815 name
= bfd_elf_string_from_elf_section (input_bfd
,
4821 osec
= sec
->output_section
;
4823 _bfd_elf_section_from_bfd_section (output_bfd
,
4825 if (isym
->st_shndx
== (unsigned short) -1)
4828 isym
->st_value
+= sec
->output_offset
;
4829 if (! finfo
->info
->relocateable
)
4830 isym
->st_value
+= osec
->vma
;
4832 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4834 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4838 r_symndx
= finfo
->indices
[r_symndx
];
4841 irela
->r_info
= ELF_R_INFO (r_symndx
,
4842 ELF_R_TYPE (irela
->r_info
));
4845 /* Swap out the relocs. */
4846 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4847 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4848 BFD_ASSERT (output_rel_hdr
->sh_entsize
4849 == input_rel_hdr
->sh_entsize
);
4850 irela
= internal_relocs
;
4851 irelaend
= irela
+ o
->reloc_count
;
4852 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4854 Elf_External_Rel
*erel
;
4856 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4857 + o
->output_section
->reloc_count
);
4858 for (; irela
< irelaend
; irela
++, erel
++)
4860 Elf_Internal_Rel irel
;
4862 irel
.r_offset
= irela
->r_offset
;
4863 irel
.r_info
= irela
->r_info
;
4864 BFD_ASSERT (irela
->r_addend
== 0);
4865 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4870 Elf_External_Rela
*erela
;
4872 BFD_ASSERT (input_rel_hdr
->sh_entsize
4873 == sizeof (Elf_External_Rela
));
4874 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4875 + o
->output_section
->reloc_count
);
4876 for (; irela
< irelaend
; irela
++, erela
++)
4877 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4880 o
->output_section
->reloc_count
+= o
->reloc_count
;
4884 /* Write out the modified section contents. */
4885 if (elf_section_data (o
)->stab_info
== NULL
)
4887 if (! (o
->flags
& SEC_EXCLUDE
) &&
4888 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
4889 contents
, o
->output_offset
,
4890 (o
->_cooked_size
!= 0
4897 if (! (_bfd_write_section_stabs
4898 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4899 o
, &elf_section_data (o
)->stab_info
, contents
)))
4907 /* Generate a reloc when linking an ELF file. This is a reloc
4908 requested by the linker, and does come from any input file. This
4909 is used to build constructor and destructor tables when linking
4913 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4915 struct bfd_link_info
*info
;
4916 asection
*output_section
;
4917 struct bfd_link_order
*link_order
;
4919 reloc_howto_type
*howto
;
4923 struct elf_link_hash_entry
**rel_hash_ptr
;
4924 Elf_Internal_Shdr
*rel_hdr
;
4926 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4929 bfd_set_error (bfd_error_bad_value
);
4933 addend
= link_order
->u
.reloc
.p
->addend
;
4935 /* Figure out the symbol index. */
4936 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4937 + output_section
->reloc_count
);
4938 if (link_order
->type
== bfd_section_reloc_link_order
)
4940 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4941 BFD_ASSERT (indx
!= 0);
4942 *rel_hash_ptr
= NULL
;
4946 struct elf_link_hash_entry
*h
;
4948 /* Treat a reloc against a defined symbol as though it were
4949 actually against the section. */
4950 h
= ((struct elf_link_hash_entry
*)
4951 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4952 link_order
->u
.reloc
.p
->u
.name
,
4953 false, false, true));
4955 && (h
->root
.type
== bfd_link_hash_defined
4956 || h
->root
.type
== bfd_link_hash_defweak
))
4960 section
= h
->root
.u
.def
.section
;
4961 indx
= section
->output_section
->target_index
;
4962 *rel_hash_ptr
= NULL
;
4963 /* It seems that we ought to add the symbol value to the
4964 addend here, but in practice it has already been added
4965 because it was passed to constructor_callback. */
4966 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4970 /* Setting the index to -2 tells elf_link_output_extsym that
4971 this symbol is used by a reloc. */
4978 if (! ((*info
->callbacks
->unattached_reloc
)
4979 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4980 (asection
*) NULL
, (bfd_vma
) 0)))
4986 /* If this is an inplace reloc, we must write the addend into the
4988 if (howto
->partial_inplace
&& addend
!= 0)
4991 bfd_reloc_status_type rstat
;
4995 size
= bfd_get_reloc_size (howto
);
4996 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4997 if (buf
== (bfd_byte
*) NULL
)
4999 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5005 case bfd_reloc_outofrange
:
5007 case bfd_reloc_overflow
:
5008 if (! ((*info
->callbacks
->reloc_overflow
)
5010 (link_order
->type
== bfd_section_reloc_link_order
5011 ? bfd_section_name (output_bfd
,
5012 link_order
->u
.reloc
.p
->u
.section
)
5013 : link_order
->u
.reloc
.p
->u
.name
),
5014 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5022 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5023 (file_ptr
) link_order
->offset
, size
);
5029 /* The address of a reloc is relative to the section in a
5030 relocateable file, and is a virtual address in an executable
5032 offset
= link_order
->offset
;
5033 if (! info
->relocateable
)
5034 offset
+= output_section
->vma
;
5036 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5038 if (rel_hdr
->sh_type
== SHT_REL
)
5040 Elf_Internal_Rel irel
;
5041 Elf_External_Rel
*erel
;
5043 irel
.r_offset
= offset
;
5044 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5045 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5046 + output_section
->reloc_count
);
5047 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5051 Elf_Internal_Rela irela
;
5052 Elf_External_Rela
*erela
;
5054 irela
.r_offset
= offset
;
5055 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5056 irela
.r_addend
= addend
;
5057 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5058 + output_section
->reloc_count
);
5059 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5062 ++output_section
->reloc_count
;
5068 /* Allocate a pointer to live in a linker created section. */
5071 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5073 struct bfd_link_info
*info
;
5074 elf_linker_section_t
*lsect
;
5075 struct elf_link_hash_entry
*h
;
5076 const Elf_Internal_Rela
*rel
;
5078 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5079 elf_linker_section_pointers_t
*linker_section_ptr
;
5080 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5082 BFD_ASSERT (lsect
!= NULL
);
5084 /* Is this a global symbol? */
5087 /* Has this symbol already been allocated, if so, our work is done */
5088 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5093 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5094 /* Make sure this symbol is output as a dynamic symbol. */
5095 if (h
->dynindx
== -1)
5097 if (! elf_link_record_dynamic_symbol (info
, h
))
5101 if (lsect
->rel_section
)
5102 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5105 else /* Allocation of a pointer to a local symbol */
5107 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5109 /* Allocate a table to hold the local symbols if first time */
5112 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5113 register unsigned int i
;
5115 ptr
= (elf_linker_section_pointers_t
**)
5116 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5121 elf_local_ptr_offsets (abfd
) = ptr
;
5122 for (i
= 0; i
< num_symbols
; i
++)
5123 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5126 /* Has this symbol already been allocated, if so, our work is done */
5127 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5132 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5136 /* If we are generating a shared object, we need to
5137 output a R_<xxx>_RELATIVE reloc so that the
5138 dynamic linker can adjust this GOT entry. */
5139 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5140 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5144 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5145 from internal memory. */
5146 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5147 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5148 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5150 if (!linker_section_ptr
)
5153 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5154 linker_section_ptr
->addend
= rel
->r_addend
;
5155 linker_section_ptr
->which
= lsect
->which
;
5156 linker_section_ptr
->written_address_p
= false;
5157 *ptr_linker_section_ptr
= linker_section_ptr
;
5160 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5162 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5163 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5164 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5165 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5167 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5169 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5170 lsect
->sym_hash
->root
.root
.string
,
5171 (long)ARCH_SIZE
/ 8,
5172 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5178 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5180 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5183 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5184 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5192 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5195 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5198 /* Fill in the address for a pointer generated in alinker section. */
5201 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5204 struct bfd_link_info
*info
;
5205 elf_linker_section_t
*lsect
;
5206 struct elf_link_hash_entry
*h
;
5208 const Elf_Internal_Rela
*rel
;
5211 elf_linker_section_pointers_t
*linker_section_ptr
;
5213 BFD_ASSERT (lsect
!= NULL
);
5215 if (h
!= NULL
) /* global symbol */
5217 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5221 BFD_ASSERT (linker_section_ptr
!= NULL
);
5223 if (! elf_hash_table (info
)->dynamic_sections_created
5226 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5228 /* This is actually a static link, or it is a
5229 -Bsymbolic link and the symbol is defined
5230 locally. We must initialize this entry in the
5233 When doing a dynamic link, we create a .rela.<xxx>
5234 relocation entry to initialize the value. This
5235 is done in the finish_dynamic_symbol routine. */
5236 if (!linker_section_ptr
->written_address_p
)
5238 linker_section_ptr
->written_address_p
= true;
5239 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5240 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5244 else /* local symbol */
5246 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5247 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5248 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5249 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5253 BFD_ASSERT (linker_section_ptr
!= NULL
);
5255 /* Write out pointer if it hasn't been rewritten out before */
5256 if (!linker_section_ptr
->written_address_p
)
5258 linker_section_ptr
->written_address_p
= true;
5259 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5260 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5264 asection
*srel
= lsect
->rel_section
;
5265 Elf_Internal_Rela outrel
;
5267 /* We need to generate a relative reloc for the dynamic linker. */
5269 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5272 BFD_ASSERT (srel
!= NULL
);
5274 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5275 + lsect
->section
->output_offset
5276 + linker_section_ptr
->offset
);
5277 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5278 outrel
.r_addend
= 0;
5279 elf_swap_reloca_out (output_bfd
, &outrel
,
5280 (((Elf_External_Rela
*)
5281 lsect
->section
->contents
)
5282 + lsect
->section
->reloc_count
));
5283 ++lsect
->section
->reloc_count
;
5288 relocation
= (lsect
->section
->output_offset
5289 + linker_section_ptr
->offset
5290 - lsect
->hole_offset
5291 - lsect
->sym_offset
);
5294 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5295 lsect
->name
, (long)relocation
, (long)relocation
);
5298 /* Subtract out the addend, because it will get added back in by the normal
5300 return relocation
- linker_section_ptr
->addend
;
5303 /* Garbage collect unused sections. */
5305 static boolean elf_gc_mark
5306 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5307 asection
* (*gc_mark_hook
)
5308 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5309 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5311 static boolean elf_gc_sweep
5312 PARAMS ((struct bfd_link_info
*info
,
5313 boolean (*gc_sweep_hook
)
5314 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5315 const Elf_Internal_Rela
*relocs
))));
5317 static boolean elf_gc_sweep_symbol
5318 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5320 static boolean elf_gc_allocate_got_offsets
5321 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5323 static boolean elf_gc_propogate_vtable_entries_used
5324 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5326 static boolean elf_gc_smash_unused_vtentry_relocs
5327 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5329 /* The mark phase of garbage collection. For a given section, mark
5330 it, and all the sections which define symbols to which it refers. */
5333 elf_gc_mark (info
, sec
, gc_mark_hook
)
5334 struct bfd_link_info
*info
;
5336 asection
* (*gc_mark_hook
)
5337 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5338 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5344 /* Look through the section relocs. */
5346 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5348 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5349 Elf_Internal_Shdr
*symtab_hdr
;
5350 struct elf_link_hash_entry
**sym_hashes
;
5353 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5354 bfd
*input_bfd
= sec
->owner
;
5356 /* GCFIXME: how to arrange so that relocs and symbols are not
5357 reread continually? */
5359 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5360 sym_hashes
= elf_sym_hashes (input_bfd
);
5362 /* Read the local symbols. */
5363 if (elf_bad_symtab (input_bfd
))
5365 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5369 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5370 if (symtab_hdr
->contents
)
5371 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5372 else if (nlocsyms
== 0)
5376 locsyms
= freesyms
=
5377 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5378 if (freesyms
== NULL
5379 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5380 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5381 nlocsyms
, input_bfd
)
5382 != nlocsyms
* sizeof (Elf_External_Sym
)))
5389 /* Read the relocations. */
5390 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5391 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5392 info
->keep_memory
));
5393 if (relstart
== NULL
)
5398 relend
= relstart
+ sec
->reloc_count
;
5400 for (rel
= relstart
; rel
< relend
; rel
++)
5402 unsigned long r_symndx
;
5404 struct elf_link_hash_entry
*h
;
5407 r_symndx
= ELF_R_SYM (rel
->r_info
);
5411 if (elf_bad_symtab (sec
->owner
))
5413 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5414 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5415 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5418 h
= sym_hashes
[r_symndx
- extsymoff
];
5419 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5422 else if (r_symndx
>= nlocsyms
)
5424 h
= sym_hashes
[r_symndx
- extsymoff
];
5425 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5429 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5430 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5433 if (rsec
&& !rsec
->gc_mark
)
5434 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5442 if (!info
->keep_memory
)
5452 /* The sweep phase of garbage collection. Remove all garbage sections. */
5455 elf_gc_sweep (info
, gc_sweep_hook
)
5456 struct bfd_link_info
*info
;
5457 boolean (*gc_sweep_hook
)
5458 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5459 const Elf_Internal_Rela
*relocs
));
5463 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5467 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5469 /* Keep special sections. Keep .debug sections. */
5470 if ((o
->flags
& SEC_LINKER_CREATED
)
5471 || (o
->flags
& SEC_DEBUGGING
))
5477 /* Skip sweeping sections already excluded. */
5478 if (o
->flags
& SEC_EXCLUDE
)
5481 /* Since this is early in the link process, it is simple
5482 to remove a section from the output. */
5483 o
->flags
|= SEC_EXCLUDE
;
5485 /* But we also have to update some of the relocation
5486 info we collected before. */
5488 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5490 Elf_Internal_Rela
*internal_relocs
;
5493 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5494 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5495 if (internal_relocs
== NULL
)
5498 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5500 if (!info
->keep_memory
)
5501 free (internal_relocs
);
5509 /* Remove the symbols that were in the swept sections from the dynamic
5510 symbol table. GCFIXME: Anyone know how to get them out of the
5511 static symbol table as well? */
5515 elf_link_hash_traverse (elf_hash_table (info
),
5516 elf_gc_sweep_symbol
,
5519 elf_hash_table (info
)->dynsymcount
= i
;
5523 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5526 elf_gc_sweep_symbol (h
, idxptr
)
5527 struct elf_link_hash_entry
*h
;
5530 int *idx
= (int *) idxptr
;
5532 if (h
->dynindx
!= -1
5533 && ((h
->root
.type
!= bfd_link_hash_defined
5534 && h
->root
.type
!= bfd_link_hash_defweak
)
5535 || h
->root
.u
.def
.section
->gc_mark
))
5536 h
->dynindx
= (*idx
)++;
5541 /* Propogate collected vtable information. This is called through
5542 elf_link_hash_traverse. */
5545 elf_gc_propogate_vtable_entries_used (h
, okp
)
5546 struct elf_link_hash_entry
*h
;
5549 /* Those that are not vtables. */
5550 if (h
->vtable_parent
== NULL
)
5553 /* Those vtables that do not have parents, we cannot merge. */
5554 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5557 /* If we've already been done, exit. */
5558 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5561 /* Make sure the parent's table is up to date. */
5562 elf_gc_propogate_vtable_entries_used (h
->vtable_parent
, okp
);
5564 if (h
->vtable_entries_used
== NULL
)
5566 /* None of this table's entries were referenced. Re-use the
5568 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5575 /* Or the parent's entries into ours. */
5576 cu
= h
->vtable_entries_used
;
5578 pu
= h
->vtable_parent
->vtable_entries_used
;
5581 n
= h
->vtable_parent
->size
/ FILE_ALIGN
;
5584 if (*pu
) *cu
= true;
5594 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5595 struct elf_link_hash_entry
*h
;
5599 bfd_vma hstart
, hend
;
5600 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5602 /* Take care of both those symbols that do not describe vtables as
5603 well as those that are not loaded. */
5604 if (h
->vtable_parent
== NULL
)
5607 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5608 || h
->root
.type
== bfd_link_hash_defweak
);
5610 sec
= h
->root
.u
.def
.section
;
5611 hstart
= h
->root
.u
.def
.value
;
5612 hend
= hstart
+ h
->size
;
5614 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5615 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5617 return *(boolean
*)okp
= false;
5618 relend
= relstart
+ sec
->reloc_count
;
5620 for (rel
= relstart
; rel
< relend
; ++rel
)
5621 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5623 /* If the entry is in use, do nothing. */
5624 if (h
->vtable_entries_used
)
5626 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5627 if (h
->vtable_entries_used
[entry
])
5630 /* Otherwise, kill it. */
5631 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5637 /* Do mark and sweep of unused sections. */
5640 elf_gc_sections (abfd
, info
)
5642 struct bfd_link_info
*info
;
5646 asection
* (*gc_mark_hook
)
5647 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5648 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5650 if (!get_elf_backend_data (abfd
)->can_gc_sections
5651 || info
->relocateable
)
5654 /* Apply transitive closure to the vtable entry usage info. */
5655 elf_link_hash_traverse (elf_hash_table (info
),
5656 elf_gc_propogate_vtable_entries_used
,
5661 /* Kill the vtable relocations that were not used. */
5662 elf_link_hash_traverse (elf_hash_table (info
),
5663 elf_gc_smash_unused_vtentry_relocs
,
5668 /* Grovel through relocs to find out who stays ... */
5670 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5671 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5674 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5676 if (o
->flags
& SEC_KEEP
)
5677 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5682 /* ... and mark SEC_EXCLUDE for those that go. */
5683 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5689 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5692 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5695 struct elf_link_hash_entry
*h
;
5698 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5699 struct elf_link_hash_entry
**search
, *child
;
5700 bfd_size_type extsymcount
;
5702 /* The sh_info field of the symtab header tells us where the
5703 external symbols start. We don't care about the local symbols at
5705 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5706 if (!elf_bad_symtab (abfd
))
5707 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5709 sym_hashes
= elf_sym_hashes (abfd
);
5710 sym_hashes_end
= sym_hashes
+ extsymcount
;
5712 /* Hunt down the child symbol, which is in this section at the same
5713 offset as the relocation. */
5714 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5716 if ((child
= *search
) != NULL
5717 && (child
->root
.type
== bfd_link_hash_defined
5718 || child
->root
.type
== bfd_link_hash_defweak
)
5719 && child
->root
.u
.def
.section
== sec
5720 && child
->root
.u
.def
.value
== offset
)
5724 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5725 bfd_get_filename (abfd
), sec
->name
,
5726 (unsigned long)offset
);
5727 bfd_set_error (bfd_error_invalid_operation
);
5733 /* This *should* only be the absolute section. It could potentially
5734 be that someone has defined a non-global vtable though, which
5735 would be bad. It isn't worth paging in the local symbols to be
5736 sure though; that case should simply be handled by the assembler. */
5738 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
5741 child
->vtable_parent
= h
;
5746 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
5749 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
5752 struct elf_link_hash_entry
*h
;
5755 if (h
->vtable_entries_used
== NULL
)
5757 /* Allocate one extra entry for use as a "done" flag for the
5758 consolidation pass. */
5759 size_t size
= (h
->size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
5760 h
->vtable_entries_used
= (boolean
*) bfd_alloc (abfd
, size
);
5761 if (h
->vtable_entries_used
== NULL
)
5764 /* And arrange for that done flag to be at index -1. */
5765 memset (h
->vtable_entries_used
++, 0, size
);
5767 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
5772 /* And an accompanying bit to work out final got entry offsets once
5773 we're done. Should be called from final_link. */
5776 elf_gc_common_finalize_got_offsets (abfd
, info
)
5778 struct bfd_link_info
*info
;
5780 if (elf_hash_table (info
)->dynamic_sections_created
)
5783 bfd_vma off
[2], gotoff
= 0;
5785 /* Do the local .got entries first. */
5786 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
5788 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
5789 bfd_size_type j
, locsymcount
;
5790 Elf_Internal_Shdr
*symtab_hdr
;
5795 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
5796 if (elf_bad_symtab (i
))
5797 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5799 locsymcount
= symtab_hdr
->sh_info
;
5801 for (j
= 0; j
< locsymcount
; ++j
)
5802 local_got
[j
] = (local_got
[j
] > 0 ? gotoff
++ : (bfd_vma
) - 1);
5805 /* Then the global .got and .plt entries. */
5808 elf_link_hash_traverse (elf_hash_table (info
),
5809 elf_gc_allocate_got_offsets
,
5816 /* We need a special top-level link routine to convert got reference counts
5817 to real got offsets. */
5820 elf_gc_allocate_got_offsets (h
, offarg
)
5821 struct elf_link_hash_entry
*h
;
5824 bfd_vma
*off
= (bfd_vma
*) offarg
;
5826 h
->got
.offset
= (h
->got
.refcount
> 0 ? off
[0]++ : (bfd_vma
) - 1);
5831 /* Many folk need no more in the way of final link than this, once
5832 got entry reference counting is enabled. */
5835 elf_gc_common_final_link (abfd
, info
)
5837 struct bfd_link_info
*info
;
5839 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
5842 /* Invoke the regular ELF backend linker to do all the work. */
5843 return elf_bfd_final_link (abfd
, info
);