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 and procedure linkage table
1460 offset entries. These may have been already set
1461 up by a 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
->plt
.offset
== (bfd_vma
) -1)
1471 ht
->plt
.offset
= hi
->plt
.offset
;
1472 hi
->plt
.offset
= (bfd_vma
) -1;
1474 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1476 if (ht
->dynindx
== -1)
1478 ht
->dynindx
= hi
->dynindx
;
1479 ht
->dynstr_index
= hi
->dynstr_index
;
1481 hi
->dynstr_index
= 0;
1483 BFD_ASSERT (hi
->dynindx
== -1);
1485 /* FIXME: There may be other information to copy
1486 over for particular targets. */
1488 /* See if the new flags lead us to realize that
1489 the symbol must be dynamic. */
1495 || ((hi
->elf_link_hash_flags
1496 & ELF_LINK_HASH_REF_DYNAMIC
)
1502 if ((hi
->elf_link_hash_flags
1503 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1509 /* We also need to define an indirection from the
1510 nondefault version of the symbol. */
1512 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1514 if (shortname
== NULL
)
1516 strncpy (shortname
, name
, p
- name
);
1517 strcpy (shortname
+ (p
- name
), p
+ 1);
1519 /* Once again, merge with any existing symbol. */
1520 type_change_ok
= false;
1521 size_change_ok
= false;
1522 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1523 &value
, &hi
, &override
,
1524 &type_change_ok
, &size_change_ok
))
1529 /* Here SHORTNAME is a versioned name, so we
1530 don't expect to see the type of override we
1531 do in the case above. */
1532 (*_bfd_error_handler
)
1533 (_("%s: warning: unexpected redefinition of `%s'"),
1534 bfd_get_filename (abfd
), shortname
);
1538 if (! (_bfd_generic_link_add_one_symbol
1539 (info
, abfd
, shortname
, BSF_INDIRECT
,
1540 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1541 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1544 /* If there is a duplicate definition somewhere,
1545 then HI may not point to an indirect symbol.
1546 We will have reported an error to the user in
1549 if (hi
->root
.type
== bfd_link_hash_indirect
)
1551 /* If the symbol became indirect, then we
1552 assume that we have not seen a definition
1554 BFD_ASSERT ((hi
->elf_link_hash_flags
1555 & (ELF_LINK_HASH_DEF_DYNAMIC
1556 | ELF_LINK_HASH_DEF_REGULAR
))
1559 /* Copy down any references that we may have
1560 already seen to the symbol which just
1562 h
->elf_link_hash_flags
|=
1563 (hi
->elf_link_hash_flags
1564 & (ELF_LINK_HASH_REF_DYNAMIC
1565 | ELF_LINK_HASH_REF_REGULAR
));
1567 /* Copy over the global and procedure linkage
1568 table offset entries. These may have been
1569 already set up by a check_relocs routine. */
1570 if (h
->got
.offset
== (bfd_vma
) -1)
1572 h
->got
.offset
= hi
->got
.offset
;
1573 hi
->got
.offset
= (bfd_vma
) -1;
1575 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1577 if (h
->plt
.offset
== (bfd_vma
) -1)
1579 h
->plt
.offset
= hi
->plt
.offset
;
1580 hi
->plt
.offset
= (bfd_vma
) -1;
1582 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1584 if (h
->dynindx
== -1)
1586 h
->dynindx
= hi
->dynindx
;
1587 h
->dynstr_index
= hi
->dynstr_index
;
1589 hi
->dynstr_index
= 0;
1591 BFD_ASSERT (hi
->dynindx
== -1);
1593 /* FIXME: There may be other information to
1594 copy over for particular targets. */
1596 /* See if the new flags lead us to realize
1597 that the symbol must be dynamic. */
1603 || ((hi
->elf_link_hash_flags
1604 & ELF_LINK_HASH_REF_DYNAMIC
)
1610 if ((hi
->elf_link_hash_flags
1611 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1620 if (dynsym
&& h
->dynindx
== -1)
1622 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1624 if (h
->weakdef
!= NULL
1626 && h
->weakdef
->dynindx
== -1)
1628 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1636 /* Now set the weakdefs field correctly for all the weak defined
1637 symbols we found. The only way to do this is to search all the
1638 symbols. Since we only need the information for non functions in
1639 dynamic objects, that's the only time we actually put anything on
1640 the list WEAKS. We need this information so that if a regular
1641 object refers to a symbol defined weakly in a dynamic object, the
1642 real symbol in the dynamic object is also put in the dynamic
1643 symbols; we also must arrange for both symbols to point to the
1644 same memory location. We could handle the general case of symbol
1645 aliasing, but a general symbol alias can only be generated in
1646 assembler code, handling it correctly would be very time
1647 consuming, and other ELF linkers don't handle general aliasing
1649 while (weaks
!= NULL
)
1651 struct elf_link_hash_entry
*hlook
;
1654 struct elf_link_hash_entry
**hpp
;
1655 struct elf_link_hash_entry
**hppend
;
1658 weaks
= hlook
->weakdef
;
1659 hlook
->weakdef
= NULL
;
1661 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1662 || hlook
->root
.type
== bfd_link_hash_defweak
1663 || hlook
->root
.type
== bfd_link_hash_common
1664 || hlook
->root
.type
== bfd_link_hash_indirect
);
1665 slook
= hlook
->root
.u
.def
.section
;
1666 vlook
= hlook
->root
.u
.def
.value
;
1668 hpp
= elf_sym_hashes (abfd
);
1669 hppend
= hpp
+ extsymcount
;
1670 for (; hpp
< hppend
; hpp
++)
1672 struct elf_link_hash_entry
*h
;
1675 if (h
!= NULL
&& h
!= hlook
1676 && h
->root
.type
== bfd_link_hash_defined
1677 && h
->root
.u
.def
.section
== slook
1678 && h
->root
.u
.def
.value
== vlook
)
1682 /* If the weak definition is in the list of dynamic
1683 symbols, make sure the real definition is put there
1685 if (hlook
->dynindx
!= -1
1686 && h
->dynindx
== -1)
1688 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1692 /* If the real definition is in the list of dynamic
1693 symbols, make sure the weak definition is put there
1694 as well. If we don't do this, then the dynamic
1695 loader might not merge the entries for the real
1696 definition and the weak definition. */
1697 if (h
->dynindx
!= -1
1698 && hlook
->dynindx
== -1)
1700 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1715 if (extversym
!= NULL
)
1721 /* If this object is the same format as the output object, and it is
1722 not a shared library, then let the backend look through the
1725 This is required to build global offset table entries and to
1726 arrange for dynamic relocs. It is not required for the
1727 particular common case of linking non PIC code, even when linking
1728 against shared libraries, but unfortunately there is no way of
1729 knowing whether an object file has been compiled PIC or not.
1730 Looking through the relocs is not particularly time consuming.
1731 The problem is that we must either (1) keep the relocs in memory,
1732 which causes the linker to require additional runtime memory or
1733 (2) read the relocs twice from the input file, which wastes time.
1734 This would be a good case for using mmap.
1736 I have no idea how to handle linking PIC code into a file of a
1737 different format. It probably can't be done. */
1738 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1740 && abfd
->xvec
== info
->hash
->creator
1741 && check_relocs
!= NULL
)
1745 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1747 Elf_Internal_Rela
*internal_relocs
;
1750 if ((o
->flags
& SEC_RELOC
) == 0
1751 || o
->reloc_count
== 0
1752 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1753 && (o
->flags
& SEC_DEBUGGING
) != 0)
1754 || bfd_is_abs_section (o
->output_section
))
1757 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1758 (abfd
, o
, (PTR
) NULL
,
1759 (Elf_Internal_Rela
*) NULL
,
1760 info
->keep_memory
));
1761 if (internal_relocs
== NULL
)
1764 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1766 if (! info
->keep_memory
)
1767 free (internal_relocs
);
1774 /* If this is a non-traditional, non-relocateable link, try to
1775 optimize the handling of the .stab/.stabstr sections. */
1777 && ! info
->relocateable
1778 && ! info
->traditional_format
1779 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1780 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1782 asection
*stab
, *stabstr
;
1784 stab
= bfd_get_section_by_name (abfd
, ".stab");
1787 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1789 if (stabstr
!= NULL
)
1791 struct bfd_elf_section_data
*secdata
;
1793 secdata
= elf_section_data (stab
);
1794 if (! _bfd_link_section_stabs (abfd
,
1795 &elf_hash_table (info
)->stab_info
,
1797 &secdata
->stab_info
))
1812 if (extversym
!= NULL
)
1817 /* Create some sections which will be filled in with dynamic linking
1818 information. ABFD is an input file which requires dynamic sections
1819 to be created. The dynamic sections take up virtual memory space
1820 when the final executable is run, so we need to create them before
1821 addresses are assigned to the output sections. We work out the
1822 actual contents and size of these sections later. */
1825 elf_link_create_dynamic_sections (abfd
, info
)
1827 struct bfd_link_info
*info
;
1830 register asection
*s
;
1831 struct elf_link_hash_entry
*h
;
1832 struct elf_backend_data
*bed
;
1834 if (elf_hash_table (info
)->dynamic_sections_created
)
1837 /* Make sure that all dynamic sections use the same input BFD. */
1838 if (elf_hash_table (info
)->dynobj
== NULL
)
1839 elf_hash_table (info
)->dynobj
= abfd
;
1841 abfd
= elf_hash_table (info
)->dynobj
;
1843 /* Note that we set the SEC_IN_MEMORY flag for all of these
1845 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1846 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1848 /* A dynamically linked executable has a .interp section, but a
1849 shared library does not. */
1852 s
= bfd_make_section (abfd
, ".interp");
1854 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1858 /* Create sections to hold version informations. These are removed
1859 if they are not needed. */
1860 s
= bfd_make_section (abfd
, ".gnu.version_d");
1862 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1863 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1866 s
= bfd_make_section (abfd
, ".gnu.version");
1868 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1869 || ! bfd_set_section_alignment (abfd
, s
, 1))
1872 s
= bfd_make_section (abfd
, ".gnu.version_r");
1874 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1875 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1878 s
= bfd_make_section (abfd
, ".dynsym");
1880 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1881 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1884 s
= bfd_make_section (abfd
, ".dynstr");
1886 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1889 /* Create a strtab to hold the dynamic symbol names. */
1890 if (elf_hash_table (info
)->dynstr
== NULL
)
1892 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1893 if (elf_hash_table (info
)->dynstr
== NULL
)
1897 s
= bfd_make_section (abfd
, ".dynamic");
1899 || ! bfd_set_section_flags (abfd
, s
, flags
)
1900 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1903 /* The special symbol _DYNAMIC is always set to the start of the
1904 .dynamic section. This call occurs before we have processed the
1905 symbols for any dynamic object, so we don't have to worry about
1906 overriding a dynamic definition. We could set _DYNAMIC in a
1907 linker script, but we only want to define it if we are, in fact,
1908 creating a .dynamic section. We don't want to define it if there
1909 is no .dynamic section, since on some ELF platforms the start up
1910 code examines it to decide how to initialize the process. */
1912 if (! (_bfd_generic_link_add_one_symbol
1913 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1914 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1915 (struct bfd_link_hash_entry
**) &h
)))
1917 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1918 h
->type
= STT_OBJECT
;
1921 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1924 s
= bfd_make_section (abfd
, ".hash");
1926 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1927 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1930 /* Let the backend create the rest of the sections. This lets the
1931 backend set the right flags. The backend will normally create
1932 the .got and .plt sections. */
1933 bed
= get_elf_backend_data (abfd
);
1934 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1937 elf_hash_table (info
)->dynamic_sections_created
= true;
1942 /* Add an entry to the .dynamic table. */
1945 elf_add_dynamic_entry (info
, tag
, val
)
1946 struct bfd_link_info
*info
;
1950 Elf_Internal_Dyn dyn
;
1954 bfd_byte
*newcontents
;
1956 dynobj
= elf_hash_table (info
)->dynobj
;
1958 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1959 BFD_ASSERT (s
!= NULL
);
1961 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1962 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1963 if (newcontents
== NULL
)
1967 dyn
.d_un
.d_val
= val
;
1968 elf_swap_dyn_out (dynobj
, &dyn
,
1969 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1971 s
->_raw_size
= newsize
;
1972 s
->contents
= newcontents
;
1978 /* Read and swap the relocs for a section. They may have been cached.
1979 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1980 they are used as buffers to read into. They are known to be large
1981 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1982 value is allocated using either malloc or bfd_alloc, according to
1983 the KEEP_MEMORY argument. */
1986 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1990 PTR external_relocs
;
1991 Elf_Internal_Rela
*internal_relocs
;
1992 boolean keep_memory
;
1994 Elf_Internal_Shdr
*rel_hdr
;
1996 Elf_Internal_Rela
*alloc2
= NULL
;
1998 if (elf_section_data (o
)->relocs
!= NULL
)
1999 return elf_section_data (o
)->relocs
;
2001 if (o
->reloc_count
== 0)
2004 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2006 if (internal_relocs
== NULL
)
2010 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2012 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2014 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2015 if (internal_relocs
== NULL
)
2019 if (external_relocs
== NULL
)
2021 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2024 external_relocs
= alloc1
;
2027 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2028 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2029 != rel_hdr
->sh_size
))
2032 /* Swap in the relocs. For convenience, we always produce an
2033 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2035 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2037 Elf_External_Rel
*erel
;
2038 Elf_External_Rel
*erelend
;
2039 Elf_Internal_Rela
*irela
;
2041 erel
= (Elf_External_Rel
*) external_relocs
;
2042 erelend
= erel
+ o
->reloc_count
;
2043 irela
= internal_relocs
;
2044 for (; erel
< erelend
; erel
++, irela
++)
2046 Elf_Internal_Rel irel
;
2048 elf_swap_reloc_in (abfd
, erel
, &irel
);
2049 irela
->r_offset
= irel
.r_offset
;
2050 irela
->r_info
= irel
.r_info
;
2051 irela
->r_addend
= 0;
2056 Elf_External_Rela
*erela
;
2057 Elf_External_Rela
*erelaend
;
2058 Elf_Internal_Rela
*irela
;
2060 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2062 erela
= (Elf_External_Rela
*) external_relocs
;
2063 erelaend
= erela
+ o
->reloc_count
;
2064 irela
= internal_relocs
;
2065 for (; erela
< erelaend
; erela
++, irela
++)
2066 elf_swap_reloca_in (abfd
, erela
, irela
);
2069 /* Cache the results for next time, if we can. */
2071 elf_section_data (o
)->relocs
= internal_relocs
;
2076 /* Don't free alloc2, since if it was allocated we are passing it
2077 back (under the name of internal_relocs). */
2079 return internal_relocs
;
2090 /* Record an assignment to a symbol made by a linker script. We need
2091 this in case some dynamic object refers to this symbol. */
2095 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2097 struct bfd_link_info
*info
;
2101 struct elf_link_hash_entry
*h
;
2103 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2106 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2110 if (h
->root
.type
== bfd_link_hash_new
)
2111 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2113 /* If this symbol is being provided by the linker script, and it is
2114 currently defined by a dynamic object, but not by a regular
2115 object, then mark it as undefined so that the generic linker will
2116 force the correct value. */
2118 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2119 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2120 h
->root
.type
= bfd_link_hash_undefined
;
2122 /* If this symbol is not being provided by the linker script, and it is
2123 currently defined by a dynamic object, but not by a regular object,
2124 then clear out any version information because the symbol will not be
2125 associated with the dynamic object any more. */
2127 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2128 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2129 h
->verinfo
.verdef
= NULL
;
2131 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2132 h
->type
= STT_OBJECT
;
2134 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2135 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2137 && h
->dynindx
== -1)
2139 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2142 /* If this is a weak defined symbol, and we know a corresponding
2143 real symbol from the same dynamic object, make sure the real
2144 symbol is also made into a dynamic symbol. */
2145 if (h
->weakdef
!= NULL
2146 && h
->weakdef
->dynindx
== -1)
2148 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2156 /* This structure is used to pass information to
2157 elf_link_assign_sym_version. */
2159 struct elf_assign_sym_version_info
2163 /* General link information. */
2164 struct bfd_link_info
*info
;
2166 struct bfd_elf_version_tree
*verdefs
;
2167 /* Whether we are exporting all dynamic symbols. */
2168 boolean export_dynamic
;
2169 /* Whether we removed any symbols from the dynamic symbol table. */
2170 boolean removed_dynamic
;
2171 /* Whether we had a failure. */
2175 /* This structure is used to pass information to
2176 elf_link_find_version_dependencies. */
2178 struct elf_find_verdep_info
2182 /* General link information. */
2183 struct bfd_link_info
*info
;
2184 /* The number of dependencies. */
2186 /* Whether we had a failure. */
2190 /* Array used to determine the number of hash table buckets to use
2191 based on the number of symbols there are. If there are fewer than
2192 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2193 fewer than 37 we use 17 buckets, and so forth. We never use more
2194 than 32771 buckets. */
2196 static const size_t elf_buckets
[] =
2198 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2202 /* Set up the sizes and contents of the ELF dynamic sections. This is
2203 called by the ELF linker emulation before_allocation routine. We
2204 must set the sizes of the sections before the linker sets the
2205 addresses of the various sections. */
2208 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2209 export_dynamic
, filter_shlib
,
2210 auxiliary_filters
, info
, sinterpptr
,
2215 boolean export_dynamic
;
2216 const char *filter_shlib
;
2217 const char * const *auxiliary_filters
;
2218 struct bfd_link_info
*info
;
2219 asection
**sinterpptr
;
2220 struct bfd_elf_version_tree
*verdefs
;
2222 bfd_size_type soname_indx
;
2224 struct elf_backend_data
*bed
;
2225 bfd_size_type old_dynsymcount
;
2226 struct elf_assign_sym_version_info asvinfo
;
2230 soname_indx
= (bfd_size_type
) -1;
2232 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2235 /* The backend may have to create some sections regardless of whether
2236 we're dynamic or not. */
2237 bed
= get_elf_backend_data (output_bfd
);
2238 if (bed
->elf_backend_always_size_sections
2239 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2242 dynobj
= elf_hash_table (info
)->dynobj
;
2244 /* If there were no dynamic objects in the link, there is nothing to
2249 /* If we are supposed to export all symbols into the dynamic symbol
2250 table (this is not the normal case), then do so. */
2253 struct elf_info_failed eif
;
2257 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2263 if (elf_hash_table (info
)->dynamic_sections_created
)
2265 struct elf_info_failed eif
;
2266 struct elf_link_hash_entry
*h
;
2267 bfd_size_type strsize
;
2269 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2270 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2274 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2275 soname
, true, true);
2276 if (soname_indx
== (bfd_size_type
) -1
2277 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2283 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2291 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2293 if (indx
== (bfd_size_type
) -1
2294 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2298 if (filter_shlib
!= NULL
)
2302 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2303 filter_shlib
, true, true);
2304 if (indx
== (bfd_size_type
) -1
2305 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2309 if (auxiliary_filters
!= NULL
)
2311 const char * const *p
;
2313 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2317 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2319 if (indx
== (bfd_size_type
) -1
2320 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2325 /* Attach all the symbols to their version information. */
2326 asvinfo
.output_bfd
= output_bfd
;
2327 asvinfo
.info
= info
;
2328 asvinfo
.verdefs
= verdefs
;
2329 asvinfo
.export_dynamic
= export_dynamic
;
2330 asvinfo
.removed_dynamic
= false;
2331 asvinfo
.failed
= false;
2333 elf_link_hash_traverse (elf_hash_table (info
),
2334 elf_link_assign_sym_version
,
2339 /* Find all symbols which were defined in a dynamic object and make
2340 the backend pick a reasonable value for them. */
2343 elf_link_hash_traverse (elf_hash_table (info
),
2344 elf_adjust_dynamic_symbol
,
2349 /* Add some entries to the .dynamic section. We fill in some of the
2350 values later, in elf_bfd_final_link, but we must add the entries
2351 now so that we know the final size of the .dynamic section. */
2352 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2355 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2356 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2358 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2361 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2364 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2365 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2367 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2370 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2371 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2372 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2373 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2374 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2375 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2376 sizeof (Elf_External_Sym
)))
2380 /* The backend must work out the sizes of all the other dynamic
2382 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2383 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2386 if (elf_hash_table (info
)->dynamic_sections_created
)
2391 size_t bucketcount
= 0;
2392 Elf_Internal_Sym isym
;
2394 /* Set up the version definition section. */
2395 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2396 BFD_ASSERT (s
!= NULL
);
2398 /* We may have created additional version definitions if we are
2399 just linking a regular application. */
2400 verdefs
= asvinfo
.verdefs
;
2402 if (verdefs
== NULL
)
2406 /* Don't include this section in the output file. */
2407 for (spp
= &output_bfd
->sections
;
2408 *spp
!= s
->output_section
;
2409 spp
= &(*spp
)->next
)
2411 *spp
= s
->output_section
->next
;
2412 --output_bfd
->section_count
;
2418 struct bfd_elf_version_tree
*t
;
2420 Elf_Internal_Verdef def
;
2421 Elf_Internal_Verdaux defaux
;
2423 if (asvinfo
.removed_dynamic
)
2425 /* Some dynamic symbols were changed to be local
2426 symbols. In this case, we renumber all of the
2427 dynamic symbols, so that we don't have a hole. If
2428 the backend changed dynsymcount, then assume that the
2429 new symbols are at the start. This is the case on
2430 the MIPS. FIXME: The names of the removed symbols
2431 will still be in the dynamic string table, wasting
2433 elf_hash_table (info
)->dynsymcount
=
2434 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2435 elf_link_hash_traverse (elf_hash_table (info
),
2436 elf_link_renumber_dynsyms
,
2443 /* Make space for the base version. */
2444 size
+= sizeof (Elf_External_Verdef
);
2445 size
+= sizeof (Elf_External_Verdaux
);
2448 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2450 struct bfd_elf_version_deps
*n
;
2452 size
+= sizeof (Elf_External_Verdef
);
2453 size
+= sizeof (Elf_External_Verdaux
);
2456 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2457 size
+= sizeof (Elf_External_Verdaux
);
2460 s
->_raw_size
= size
;
2461 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2462 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2465 /* Fill in the version definition section. */
2469 def
.vd_version
= VER_DEF_CURRENT
;
2470 def
.vd_flags
= VER_FLG_BASE
;
2473 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2474 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2475 + sizeof (Elf_External_Verdaux
));
2477 if (soname_indx
!= (bfd_size_type
) -1)
2479 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2480 defaux
.vda_name
= soname_indx
;
2487 name
= output_bfd
->filename
;
2488 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2489 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2491 if (indx
== (bfd_size_type
) -1)
2493 defaux
.vda_name
= indx
;
2495 defaux
.vda_next
= 0;
2497 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2498 (Elf_External_Verdef
*)p
);
2499 p
+= sizeof (Elf_External_Verdef
);
2500 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2501 (Elf_External_Verdaux
*) p
);
2502 p
+= sizeof (Elf_External_Verdaux
);
2504 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2507 struct bfd_elf_version_deps
*n
;
2508 struct elf_link_hash_entry
*h
;
2511 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2514 /* Add a symbol representing this version. */
2516 if (! (_bfd_generic_link_add_one_symbol
2517 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2518 (bfd_vma
) 0, (const char *) NULL
, false,
2519 get_elf_backend_data (dynobj
)->collect
,
2520 (struct bfd_link_hash_entry
**) &h
)))
2522 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2523 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2524 h
->type
= STT_OBJECT
;
2525 h
->verinfo
.vertree
= t
;
2527 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2530 def
.vd_version
= VER_DEF_CURRENT
;
2532 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2533 def
.vd_flags
|= VER_FLG_WEAK
;
2534 def
.vd_ndx
= t
->vernum
+ 1;
2535 def
.vd_cnt
= cdeps
+ 1;
2536 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2537 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2538 if (t
->next
!= NULL
)
2539 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2540 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2544 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2545 (Elf_External_Verdef
*) p
);
2546 p
+= sizeof (Elf_External_Verdef
);
2548 defaux
.vda_name
= h
->dynstr_index
;
2549 if (t
->deps
== NULL
)
2550 defaux
.vda_next
= 0;
2552 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2553 t
->name_indx
= defaux
.vda_name
;
2555 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2556 (Elf_External_Verdaux
*) p
);
2557 p
+= sizeof (Elf_External_Verdaux
);
2559 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2561 if (n
->version_needed
== NULL
)
2563 /* This can happen if there was an error in the
2565 defaux
.vda_name
= 0;
2568 defaux
.vda_name
= n
->version_needed
->name_indx
;
2569 if (n
->next
== NULL
)
2570 defaux
.vda_next
= 0;
2572 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2574 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2575 (Elf_External_Verdaux
*) p
);
2576 p
+= sizeof (Elf_External_Verdaux
);
2580 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2581 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2584 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2587 /* Work out the size of the version reference section. */
2589 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2590 BFD_ASSERT (s
!= NULL
);
2592 struct elf_find_verdep_info sinfo
;
2594 sinfo
.output_bfd
= output_bfd
;
2596 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2597 if (sinfo
.vers
== 0)
2599 sinfo
.failed
= false;
2601 elf_link_hash_traverse (elf_hash_table (info
),
2602 elf_link_find_version_dependencies
,
2605 if (elf_tdata (output_bfd
)->verref
== NULL
)
2609 /* We don't have any version definitions, so we can just
2610 remove the section. */
2612 for (spp
= &output_bfd
->sections
;
2613 *spp
!= s
->output_section
;
2614 spp
= &(*spp
)->next
)
2616 *spp
= s
->output_section
->next
;
2617 --output_bfd
->section_count
;
2621 Elf_Internal_Verneed
*t
;
2626 /* Build the version definition section. */
2629 for (t
= elf_tdata (output_bfd
)->verref
;
2633 Elf_Internal_Vernaux
*a
;
2635 size
+= sizeof (Elf_External_Verneed
);
2637 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2638 size
+= sizeof (Elf_External_Vernaux
);
2641 s
->_raw_size
= size
;
2642 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2643 if (s
->contents
== NULL
)
2647 for (t
= elf_tdata (output_bfd
)->verref
;
2652 Elf_Internal_Vernaux
*a
;
2656 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2659 t
->vn_version
= VER_NEED_CURRENT
;
2661 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2662 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2663 elf_dt_name (t
->vn_bfd
),
2666 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2667 t
->vn_bfd
->filename
, true, false);
2668 if (indx
== (bfd_size_type
) -1)
2671 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2672 if (t
->vn_nextref
== NULL
)
2675 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2676 + caux
* sizeof (Elf_External_Vernaux
));
2678 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2679 (Elf_External_Verneed
*) p
);
2680 p
+= sizeof (Elf_External_Verneed
);
2682 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2684 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2686 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2687 a
->vna_nodename
, true, false);
2688 if (indx
== (bfd_size_type
) -1)
2691 if (a
->vna_nextptr
== NULL
)
2694 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2696 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2697 (Elf_External_Vernaux
*) p
);
2698 p
+= sizeof (Elf_External_Vernaux
);
2702 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2703 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2706 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2710 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2712 /* Work out the size of the symbol version section. */
2713 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2714 BFD_ASSERT (s
!= NULL
);
2715 if (dynsymcount
== 0
2716 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2720 /* We don't need any symbol versions; just discard the
2722 for (spp
= &output_bfd
->sections
;
2723 *spp
!= s
->output_section
;
2724 spp
= &(*spp
)->next
)
2726 *spp
= s
->output_section
->next
;
2727 --output_bfd
->section_count
;
2731 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2732 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2733 if (s
->contents
== NULL
)
2736 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2740 /* Set the size of the .dynsym and .hash sections. We counted
2741 the number of dynamic symbols in elf_link_add_object_symbols.
2742 We will build the contents of .dynsym and .hash when we build
2743 the final symbol table, because until then we do not know the
2744 correct value to give the symbols. We built the .dynstr
2745 section as we went along in elf_link_add_object_symbols. */
2746 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2747 BFD_ASSERT (s
!= NULL
);
2748 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2749 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2750 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2753 /* The first entry in .dynsym is a dummy symbol. */
2760 elf_swap_symbol_out (output_bfd
, &isym
,
2761 (PTR
) (Elf_External_Sym
*) s
->contents
);
2763 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2765 bucketcount
= elf_buckets
[i
];
2766 if (dynsymcount
< elf_buckets
[i
+ 1])
2770 s
= bfd_get_section_by_name (dynobj
, ".hash");
2771 BFD_ASSERT (s
!= NULL
);
2772 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2773 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2774 if (s
->contents
== NULL
)
2776 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2778 put_word (output_bfd
, bucketcount
, s
->contents
);
2779 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2781 elf_hash_table (info
)->bucketcount
= bucketcount
;
2783 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2784 BFD_ASSERT (s
!= NULL
);
2785 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2787 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2794 /* Fix up the flags for a symbol. This handles various cases which
2795 can only be fixed after all the input files are seen. This is
2796 currently called by both adjust_dynamic_symbol and
2797 assign_sym_version, which is unnecessary but perhaps more robust in
2798 the face of future changes. */
2801 elf_fix_symbol_flags (h
, eif
)
2802 struct elf_link_hash_entry
*h
;
2803 struct elf_info_failed
*eif
;
2805 /* If this symbol was mentioned in a non-ELF file, try to set
2806 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2807 permit a non-ELF file to correctly refer to a symbol defined in
2808 an ELF dynamic object. */
2809 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2811 if (h
->root
.type
!= bfd_link_hash_defined
2812 && h
->root
.type
!= bfd_link_hash_defweak
)
2813 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2816 if (h
->root
.u
.def
.section
->owner
!= NULL
2817 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2818 == bfd_target_elf_flavour
))
2819 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2821 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2824 if (h
->dynindx
== -1
2825 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2826 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2828 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2836 /* If this is a final link, and the symbol was defined as a common
2837 symbol in a regular object file, and there was no definition in
2838 any dynamic object, then the linker will have allocated space for
2839 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2840 flag will not have been set. */
2841 if (h
->root
.type
== bfd_link_hash_defined
2842 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2843 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2844 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2845 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2846 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2848 /* If -Bsymbolic was used (which means to bind references to global
2849 symbols to the definition within the shared object), and this
2850 symbol was defined in a regular object, then it actually doesn't
2851 need a PLT entry. */
2852 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2853 && eif
->info
->shared
2854 && eif
->info
->symbolic
2855 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2857 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2858 h
->plt
.offset
= (bfd_vma
) -1;
2864 /* Make the backend pick a good value for a dynamic symbol. This is
2865 called via elf_link_hash_traverse, and also calls itself
2869 elf_adjust_dynamic_symbol (h
, data
)
2870 struct elf_link_hash_entry
*h
;
2873 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2875 struct elf_backend_data
*bed
;
2877 /* Ignore indirect symbols. These are added by the versioning code. */
2878 if (h
->root
.type
== bfd_link_hash_indirect
)
2881 /* Fix the symbol flags. */
2882 if (! elf_fix_symbol_flags (h
, eif
))
2885 /* If this symbol does not require a PLT entry, and it is not
2886 defined by a dynamic object, or is not referenced by a regular
2887 object, ignore it. We do have to handle a weak defined symbol,
2888 even if no regular object refers to it, if we decided to add it
2889 to the dynamic symbol table. FIXME: Do we normally need to worry
2890 about symbols which are defined by one dynamic object and
2891 referenced by another one? */
2892 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2893 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2894 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2895 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2896 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2898 h
->plt
.offset
= (bfd_vma
) -1;
2902 /* If we've already adjusted this symbol, don't do it again. This
2903 can happen via a recursive call. */
2904 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2907 /* Don't look at this symbol again. Note that we must set this
2908 after checking the above conditions, because we may look at a
2909 symbol once, decide not to do anything, and then get called
2910 recursively later after REF_REGULAR is set below. */
2911 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2913 /* If this is a weak definition, and we know a real definition, and
2914 the real symbol is not itself defined by a regular object file,
2915 then get a good value for the real definition. We handle the
2916 real symbol first, for the convenience of the backend routine.
2918 Note that there is a confusing case here. If the real definition
2919 is defined by a regular object file, we don't get the real symbol
2920 from the dynamic object, but we do get the weak symbol. If the
2921 processor backend uses a COPY reloc, then if some routine in the
2922 dynamic object changes the real symbol, we will not see that
2923 change in the corresponding weak symbol. This is the way other
2924 ELF linkers work as well, and seems to be a result of the shared
2927 I will clarify this issue. Most SVR4 shared libraries define the
2928 variable _timezone and define timezone as a weak synonym. The
2929 tzset call changes _timezone. If you write
2930 extern int timezone;
2932 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2933 you might expect that, since timezone is a synonym for _timezone,
2934 the same number will print both times. However, if the processor
2935 backend uses a COPY reloc, then actually timezone will be copied
2936 into your process image, and, since you define _timezone
2937 yourself, _timezone will not. Thus timezone and _timezone will
2938 wind up at different memory locations. The tzset call will set
2939 _timezone, leaving timezone unchanged. */
2941 if (h
->weakdef
!= NULL
)
2943 struct elf_link_hash_entry
*weakdef
;
2945 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2946 || h
->root
.type
== bfd_link_hash_defweak
);
2947 weakdef
= h
->weakdef
;
2948 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2949 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2950 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2951 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2953 /* This symbol is defined by a regular object file, so we
2954 will not do anything special. Clear weakdef for the
2955 convenience of the processor backend. */
2960 /* There is an implicit reference by a regular object file
2961 via the weak symbol. */
2962 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2963 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2968 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2969 bed
= get_elf_backend_data (dynobj
);
2970 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2979 /* This routine is used to export all defined symbols into the dynamic
2980 symbol table. It is called via elf_link_hash_traverse. */
2983 elf_export_symbol (h
, data
)
2984 struct elf_link_hash_entry
*h
;
2987 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2989 /* Ignore indirect symbols. These are added by the versioning code. */
2990 if (h
->root
.type
== bfd_link_hash_indirect
)
2993 if (h
->dynindx
== -1
2994 && (h
->elf_link_hash_flags
2995 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2997 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3007 /* Look through the symbols which are defined in other shared
3008 libraries and referenced here. Update the list of version
3009 dependencies. This will be put into the .gnu.version_r section.
3010 This function is called via elf_link_hash_traverse. */
3013 elf_link_find_version_dependencies (h
, data
)
3014 struct elf_link_hash_entry
*h
;
3017 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3018 Elf_Internal_Verneed
*t
;
3019 Elf_Internal_Vernaux
*a
;
3021 /* We only care about symbols defined in shared objects with version
3023 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3024 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3026 || h
->verinfo
.verdef
== NULL
)
3029 /* See if we already know about this version. */
3030 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3032 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3035 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3036 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3042 /* This is a new version. Add it to tree we are building. */
3046 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3049 rinfo
->failed
= true;
3053 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3054 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3055 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3058 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3060 /* Note that we are copying a string pointer here, and testing it
3061 above. If bfd_elf_string_from_elf_section is ever changed to
3062 discard the string data when low in memory, this will have to be
3064 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3066 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3067 a
->vna_nextptr
= t
->vn_auxptr
;
3069 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3072 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3079 /* Figure out appropriate versions for all the symbols. We may not
3080 have the version number script until we have read all of the input
3081 files, so until that point we don't know which symbols should be
3082 local. This function is called via elf_link_hash_traverse. */
3085 elf_link_assign_sym_version (h
, data
)
3086 struct elf_link_hash_entry
*h
;
3089 struct elf_assign_sym_version_info
*sinfo
=
3090 (struct elf_assign_sym_version_info
*) data
;
3091 struct bfd_link_info
*info
= sinfo
->info
;
3092 struct elf_info_failed eif
;
3095 /* Fix the symbol flags. */
3098 if (! elf_fix_symbol_flags (h
, &eif
))
3101 sinfo
->failed
= true;
3105 /* We only need version numbers for symbols defined in regular
3107 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3110 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3111 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3113 struct bfd_elf_version_tree
*t
;
3118 /* There are two consecutive ELF_VER_CHR characters if this is
3119 not a hidden symbol. */
3121 if (*p
== ELF_VER_CHR
)
3127 /* If there is no version string, we can just return out. */
3131 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3135 /* Look for the version. If we find it, it is no longer weak. */
3136 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3138 if (strcmp (t
->name
, p
) == 0)
3142 struct bfd_elf_version_expr
*d
;
3144 len
= p
- h
->root
.root
.string
;
3145 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3148 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3149 alc
[len
- 1] = '\0';
3150 if (alc
[len
- 2] == ELF_VER_CHR
)
3151 alc
[len
- 2] = '\0';
3153 h
->verinfo
.vertree
= t
;
3157 if (t
->globals
!= NULL
)
3159 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3161 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3162 || fnmatch (d
->match
, alc
, 0) == 0)
3167 /* See if there is anything to force this symbol to
3169 if (d
== NULL
&& t
->locals
!= NULL
)
3171 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3173 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3174 || fnmatch (d
->match
, alc
, 0) == 0)
3176 if (h
->dynindx
!= -1
3178 && ! sinfo
->export_dynamic
)
3180 sinfo
->removed_dynamic
= true;
3181 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3182 h
->elf_link_hash_flags
&=~
3183 ELF_LINK_HASH_NEEDS_PLT
;
3185 h
->plt
.offset
= (bfd_vma
) -1;
3186 /* FIXME: The name of the symbol has
3187 already been recorded in the dynamic
3188 string table section. */
3196 bfd_release (sinfo
->output_bfd
, alc
);
3201 /* If we are building an application, we need to create a
3202 version node for this version. */
3203 if (t
== NULL
&& ! info
->shared
)
3205 struct bfd_elf_version_tree
**pp
;
3208 /* If we aren't going to export this symbol, we don't need
3209 to worry about it. */
3210 if (h
->dynindx
== -1)
3213 t
= ((struct bfd_elf_version_tree
*)
3214 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3217 sinfo
->failed
= true;
3226 t
->name_indx
= (unsigned int) -1;
3230 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3232 t
->vernum
= version_index
;
3236 h
->verinfo
.vertree
= t
;
3240 /* We could not find the version for a symbol when
3241 generating a shared archive. Return an error. */
3242 (*_bfd_error_handler
)
3243 (_("%s: undefined versioned symbol name %s"),
3244 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3245 bfd_set_error (bfd_error_bad_value
);
3246 sinfo
->failed
= true;
3251 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3254 /* If we don't have a version for this symbol, see if we can find
3256 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3258 struct bfd_elf_version_tree
*t
;
3259 struct bfd_elf_version_tree
*deflt
;
3260 struct bfd_elf_version_expr
*d
;
3262 /* See if can find what version this symbol is in. If the
3263 symbol is supposed to be local, then don't actually register
3266 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3268 if (t
->globals
!= NULL
)
3270 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3272 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3274 h
->verinfo
.vertree
= t
;
3283 if (t
->locals
!= NULL
)
3285 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3287 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3289 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3291 h
->verinfo
.vertree
= t
;
3292 if (h
->dynindx
!= -1
3294 && ! sinfo
->export_dynamic
)
3296 sinfo
->removed_dynamic
= true;
3297 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3298 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3300 h
->plt
.offset
= (bfd_vma
) -1;
3301 /* FIXME: The name of the symbol has already
3302 been recorded in the dynamic string table
3314 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3316 h
->verinfo
.vertree
= deflt
;
3317 if (h
->dynindx
!= -1
3319 && ! sinfo
->export_dynamic
)
3321 sinfo
->removed_dynamic
= true;
3322 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3323 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3325 h
->plt
.offset
= (bfd_vma
) -1;
3326 /* FIXME: The name of the symbol has already been
3327 recorded in the dynamic string table section. */
3335 /* This function is used to renumber the dynamic symbols, if some of
3336 them are removed because they are marked as local. This is called
3337 via elf_link_hash_traverse. */
3340 elf_link_renumber_dynsyms (h
, data
)
3341 struct elf_link_hash_entry
*h
;
3344 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3346 if (h
->dynindx
!= -1)
3348 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3349 ++elf_hash_table (info
)->dynsymcount
;
3355 /* Final phase of ELF linker. */
3357 /* A structure we use to avoid passing large numbers of arguments. */
3359 struct elf_final_link_info
3361 /* General link information. */
3362 struct bfd_link_info
*info
;
3365 /* Symbol string table. */
3366 struct bfd_strtab_hash
*symstrtab
;
3367 /* .dynsym section. */
3368 asection
*dynsym_sec
;
3369 /* .hash section. */
3371 /* symbol version section (.gnu.version). */
3372 asection
*symver_sec
;
3373 /* Buffer large enough to hold contents of any section. */
3375 /* Buffer large enough to hold external relocs of any section. */
3376 PTR external_relocs
;
3377 /* Buffer large enough to hold internal relocs of any section. */
3378 Elf_Internal_Rela
*internal_relocs
;
3379 /* Buffer large enough to hold external local symbols of any input
3381 Elf_External_Sym
*external_syms
;
3382 /* Buffer large enough to hold internal local symbols of any input
3384 Elf_Internal_Sym
*internal_syms
;
3385 /* Array large enough to hold a symbol index for each local symbol
3386 of any input BFD. */
3388 /* Array large enough to hold a section pointer for each local
3389 symbol of any input BFD. */
3390 asection
**sections
;
3391 /* Buffer to hold swapped out symbols. */
3392 Elf_External_Sym
*symbuf
;
3393 /* Number of swapped out symbols in buffer. */
3394 size_t symbuf_count
;
3395 /* Number of symbols which fit in symbuf. */
3399 static boolean elf_link_output_sym
3400 PARAMS ((struct elf_final_link_info
*, const char *,
3401 Elf_Internal_Sym
*, asection
*));
3402 static boolean elf_link_flush_output_syms
3403 PARAMS ((struct elf_final_link_info
*));
3404 static boolean elf_link_output_extsym
3405 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3406 static boolean elf_link_input_bfd
3407 PARAMS ((struct elf_final_link_info
*, bfd
*));
3408 static boolean elf_reloc_link_order
3409 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3410 struct bfd_link_order
*));
3412 /* This struct is used to pass information to elf_link_output_extsym. */
3414 struct elf_outext_info
3418 struct elf_final_link_info
*finfo
;
3421 /* Do the final step of an ELF link. */
3424 elf_bfd_final_link (abfd
, info
)
3426 struct bfd_link_info
*info
;
3430 struct elf_final_link_info finfo
;
3431 register asection
*o
;
3432 register struct bfd_link_order
*p
;
3434 size_t max_contents_size
;
3435 size_t max_external_reloc_size
;
3436 size_t max_internal_reloc_count
;
3437 size_t max_sym_count
;
3439 Elf_Internal_Sym elfsym
;
3441 Elf_Internal_Shdr
*symtab_hdr
;
3442 Elf_Internal_Shdr
*symstrtab_hdr
;
3443 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3444 struct elf_outext_info eoinfo
;
3447 abfd
->flags
|= DYNAMIC
;
3449 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3450 dynobj
= elf_hash_table (info
)->dynobj
;
3453 finfo
.output_bfd
= abfd
;
3454 finfo
.symstrtab
= elf_stringtab_init ();
3455 if (finfo
.symstrtab
== NULL
)
3460 finfo
.dynsym_sec
= NULL
;
3461 finfo
.hash_sec
= NULL
;
3462 finfo
.symver_sec
= NULL
;
3466 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3467 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3468 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3469 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3470 /* Note that it is OK if symver_sec is NULL. */
3473 finfo
.contents
= NULL
;
3474 finfo
.external_relocs
= NULL
;
3475 finfo
.internal_relocs
= NULL
;
3476 finfo
.external_syms
= NULL
;
3477 finfo
.internal_syms
= NULL
;
3478 finfo
.indices
= NULL
;
3479 finfo
.sections
= NULL
;
3480 finfo
.symbuf
= NULL
;
3481 finfo
.symbuf_count
= 0;
3483 /* Count up the number of relocations we will output for each output
3484 section, so that we know the sizes of the reloc sections. We
3485 also figure out some maximum sizes. */
3486 max_contents_size
= 0;
3487 max_external_reloc_size
= 0;
3488 max_internal_reloc_count
= 0;
3490 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3494 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3496 if (p
->type
== bfd_section_reloc_link_order
3497 || p
->type
== bfd_symbol_reloc_link_order
)
3499 else if (p
->type
== bfd_indirect_link_order
)
3503 sec
= p
->u
.indirect
.section
;
3505 /* Mark all sections which are to be included in the
3506 link. This will normally be every section. We need
3507 to do this so that we can identify any sections which
3508 the linker has decided to not include. */
3509 sec
->linker_mark
= true;
3511 if (info
->relocateable
)
3512 o
->reloc_count
+= sec
->reloc_count
;
3514 if (sec
->_raw_size
> max_contents_size
)
3515 max_contents_size
= sec
->_raw_size
;
3516 if (sec
->_cooked_size
> max_contents_size
)
3517 max_contents_size
= sec
->_cooked_size
;
3519 /* We are interested in just local symbols, not all
3521 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3522 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3526 if (elf_bad_symtab (sec
->owner
))
3527 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3528 / sizeof (Elf_External_Sym
));
3530 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3532 if (sym_count
> max_sym_count
)
3533 max_sym_count
= sym_count
;
3535 if ((sec
->flags
& SEC_RELOC
) != 0)
3539 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3540 if (ext_size
> max_external_reloc_size
)
3541 max_external_reloc_size
= ext_size
;
3542 if (sec
->reloc_count
> max_internal_reloc_count
)
3543 max_internal_reloc_count
= sec
->reloc_count
;
3549 if (o
->reloc_count
> 0)
3550 o
->flags
|= SEC_RELOC
;
3553 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3554 set it (this is probably a bug) and if it is set
3555 assign_section_numbers will create a reloc section. */
3556 o
->flags
&=~ SEC_RELOC
;
3559 /* If the SEC_ALLOC flag is not set, force the section VMA to
3560 zero. This is done in elf_fake_sections as well, but forcing
3561 the VMA to 0 here will ensure that relocs against these
3562 sections are handled correctly. */
3563 if ((o
->flags
& SEC_ALLOC
) == 0
3564 && ! o
->user_set_vma
)
3568 /* Figure out the file positions for everything but the symbol table
3569 and the relocs. We set symcount to force assign_section_numbers
3570 to create a symbol table. */
3571 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3572 BFD_ASSERT (! abfd
->output_has_begun
);
3573 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3576 /* That created the reloc sections. Set their sizes, and assign
3577 them file positions, and allocate some buffers. */
3578 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3580 if ((o
->flags
& SEC_RELOC
) != 0)
3582 Elf_Internal_Shdr
*rel_hdr
;
3583 register struct elf_link_hash_entry
**p
, **pend
;
3585 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3587 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3589 /* The contents field must last into write_object_contents,
3590 so we allocate it with bfd_alloc rather than malloc. */
3591 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3592 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3595 p
= ((struct elf_link_hash_entry
**)
3596 bfd_malloc (o
->reloc_count
3597 * sizeof (struct elf_link_hash_entry
*)));
3598 if (p
== NULL
&& o
->reloc_count
!= 0)
3600 elf_section_data (o
)->rel_hashes
= p
;
3601 pend
= p
+ o
->reloc_count
;
3602 for (; p
< pend
; p
++)
3605 /* Use the reloc_count field as an index when outputting the
3611 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3613 /* We have now assigned file positions for all the sections except
3614 .symtab and .strtab. We start the .symtab section at the current
3615 file position, and write directly to it. We build the .strtab
3616 section in memory. */
3618 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3619 /* sh_name is set in prep_headers. */
3620 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3621 symtab_hdr
->sh_flags
= 0;
3622 symtab_hdr
->sh_addr
= 0;
3623 symtab_hdr
->sh_size
= 0;
3624 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3625 /* sh_link is set in assign_section_numbers. */
3626 /* sh_info is set below. */
3627 /* sh_offset is set just below. */
3628 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3630 off
= elf_tdata (abfd
)->next_file_pos
;
3631 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3633 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3634 incorrect. We do not yet know the size of the .symtab section.
3635 We correct next_file_pos below, after we do know the size. */
3637 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3638 continuously seeking to the right position in the file. */
3639 if (! info
->keep_memory
|| max_sym_count
< 20)
3640 finfo
.symbuf_size
= 20;
3642 finfo
.symbuf_size
= max_sym_count
;
3643 finfo
.symbuf
= ((Elf_External_Sym
*)
3644 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3645 if (finfo
.symbuf
== NULL
)
3648 /* Start writing out the symbol table. The first symbol is always a
3650 if (info
->strip
!= strip_all
|| info
->relocateable
)
3652 elfsym
.st_value
= 0;
3655 elfsym
.st_other
= 0;
3656 elfsym
.st_shndx
= SHN_UNDEF
;
3657 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3658 &elfsym
, bfd_und_section_ptr
))
3663 /* Some standard ELF linkers do this, but we don't because it causes
3664 bootstrap comparison failures. */
3665 /* Output a file symbol for the output file as the second symbol.
3666 We output this even if we are discarding local symbols, although
3667 I'm not sure if this is correct. */
3668 elfsym
.st_value
= 0;
3670 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3671 elfsym
.st_other
= 0;
3672 elfsym
.st_shndx
= SHN_ABS
;
3673 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3674 &elfsym
, bfd_abs_section_ptr
))
3678 /* Output a symbol for each section. We output these even if we are
3679 discarding local symbols, since they are used for relocs. These
3680 symbols have no names. We store the index of each one in the
3681 index field of the section, so that we can find it again when
3682 outputting relocs. */
3683 if (info
->strip
!= strip_all
|| info
->relocateable
)
3686 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3687 elfsym
.st_other
= 0;
3688 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3690 o
= section_from_elf_index (abfd
, i
);
3692 o
->target_index
= abfd
->symcount
;
3693 elfsym
.st_shndx
= i
;
3694 if (info
->relocateable
|| o
== NULL
)
3695 elfsym
.st_value
= 0;
3697 elfsym
.st_value
= o
->vma
;
3698 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3704 /* Allocate some memory to hold information read in from the input
3706 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3707 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3708 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3709 bfd_malloc (max_internal_reloc_count
3710 * sizeof (Elf_Internal_Rela
)));
3711 finfo
.external_syms
= ((Elf_External_Sym
*)
3712 bfd_malloc (max_sym_count
3713 * sizeof (Elf_External_Sym
)));
3714 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3715 bfd_malloc (max_sym_count
3716 * sizeof (Elf_Internal_Sym
)));
3717 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3718 finfo
.sections
= ((asection
**)
3719 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3720 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3721 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3722 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3723 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3724 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3725 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3726 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3729 /* Since ELF permits relocations to be against local symbols, we
3730 must have the local symbols available when we do the relocations.
3731 Since we would rather only read the local symbols once, and we
3732 would rather not keep them in memory, we handle all the
3733 relocations for a single input file at the same time.
3735 Unfortunately, there is no way to know the total number of local
3736 symbols until we have seen all of them, and the local symbol
3737 indices precede the global symbol indices. This means that when
3738 we are generating relocateable output, and we see a reloc against
3739 a global symbol, we can not know the symbol index until we have
3740 finished examining all the local symbols to see which ones we are
3741 going to output. To deal with this, we keep the relocations in
3742 memory, and don't output them until the end of the link. This is
3743 an unfortunate waste of memory, but I don't see a good way around
3744 it. Fortunately, it only happens when performing a relocateable
3745 link, which is not the common case. FIXME: If keep_memory is set
3746 we could write the relocs out and then read them again; I don't
3747 know how bad the memory loss will be. */
3749 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3750 sub
->output_has_begun
= false;
3751 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3753 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3755 if (p
->type
== bfd_indirect_link_order
3756 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3757 == bfd_target_elf_flavour
))
3759 sub
= p
->u
.indirect
.section
->owner
;
3760 if (! sub
->output_has_begun
)
3762 if (! elf_link_input_bfd (&finfo
, sub
))
3764 sub
->output_has_begun
= true;
3767 else if (p
->type
== bfd_section_reloc_link_order
3768 || p
->type
== bfd_symbol_reloc_link_order
)
3770 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3775 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3781 /* That wrote out all the local symbols. Finish up the symbol table
3782 with the global symbols. */
3784 if (info
->strip
!= strip_all
&& info
->shared
)
3786 /* Output any global symbols that got converted to local in a
3787 version script. We do this in a separate step since ELF
3788 requires all local symbols to appear prior to any global
3789 symbols. FIXME: We should only do this if some global
3790 symbols were, in fact, converted to become local. FIXME:
3791 Will this work correctly with the Irix 5 linker? */
3792 eoinfo
.failed
= false;
3793 eoinfo
.finfo
= &finfo
;
3794 eoinfo
.localsyms
= true;
3795 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3801 /* The sh_info field records the index of the first non local
3803 symtab_hdr
->sh_info
= abfd
->symcount
;
3805 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3807 /* We get the global symbols from the hash table. */
3808 eoinfo
.failed
= false;
3809 eoinfo
.localsyms
= false;
3810 eoinfo
.finfo
= &finfo
;
3811 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3816 /* Flush all symbols to the file. */
3817 if (! elf_link_flush_output_syms (&finfo
))
3820 /* Now we know the size of the symtab section. */
3821 off
+= symtab_hdr
->sh_size
;
3823 /* Finish up and write out the symbol string table (.strtab)
3825 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3826 /* sh_name was set in prep_headers. */
3827 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3828 symstrtab_hdr
->sh_flags
= 0;
3829 symstrtab_hdr
->sh_addr
= 0;
3830 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3831 symstrtab_hdr
->sh_entsize
= 0;
3832 symstrtab_hdr
->sh_link
= 0;
3833 symstrtab_hdr
->sh_info
= 0;
3834 /* sh_offset is set just below. */
3835 symstrtab_hdr
->sh_addralign
= 1;
3837 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3838 elf_tdata (abfd
)->next_file_pos
= off
;
3840 if (abfd
->symcount
> 0)
3842 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3843 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3847 /* Adjust the relocs to have the correct symbol indices. */
3848 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3850 struct elf_link_hash_entry
**rel_hash
;
3851 Elf_Internal_Shdr
*rel_hdr
;
3853 if ((o
->flags
& SEC_RELOC
) == 0)
3856 rel_hash
= elf_section_data (o
)->rel_hashes
;
3857 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3858 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3860 if (*rel_hash
== NULL
)
3863 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3865 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3867 Elf_External_Rel
*erel
;
3868 Elf_Internal_Rel irel
;
3870 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3871 elf_swap_reloc_in (abfd
, erel
, &irel
);
3872 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3873 ELF_R_TYPE (irel
.r_info
));
3874 elf_swap_reloc_out (abfd
, &irel
, erel
);
3878 Elf_External_Rela
*erela
;
3879 Elf_Internal_Rela irela
;
3881 BFD_ASSERT (rel_hdr
->sh_entsize
3882 == sizeof (Elf_External_Rela
));
3884 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3885 elf_swap_reloca_in (abfd
, erela
, &irela
);
3886 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3887 ELF_R_TYPE (irela
.r_info
));
3888 elf_swap_reloca_out (abfd
, &irela
, erela
);
3892 /* Set the reloc_count field to 0 to prevent write_relocs from
3893 trying to swap the relocs out itself. */
3897 /* If we are linking against a dynamic object, or generating a
3898 shared library, finish up the dynamic linking information. */
3901 Elf_External_Dyn
*dyncon
, *dynconend
;
3903 /* Fix up .dynamic entries. */
3904 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3905 BFD_ASSERT (o
!= NULL
);
3907 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3908 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3909 for (; dyncon
< dynconend
; dyncon
++)
3911 Elf_Internal_Dyn dyn
;
3915 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3922 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3923 magic _init and _fini symbols. This is pretty ugly,
3924 but we are compatible. */
3932 struct elf_link_hash_entry
*h
;
3934 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3935 false, false, true);
3937 && (h
->root
.type
== bfd_link_hash_defined
3938 || h
->root
.type
== bfd_link_hash_defweak
))
3940 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3941 o
= h
->root
.u
.def
.section
;
3942 if (o
->output_section
!= NULL
)
3943 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3944 + o
->output_offset
);
3947 /* The symbol is imported from another shared
3948 library and does not apply to this one. */
3952 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3967 name
= ".gnu.version_d";
3970 name
= ".gnu.version_r";
3973 name
= ".gnu.version";
3975 o
= bfd_get_section_by_name (abfd
, name
);
3976 BFD_ASSERT (o
!= NULL
);
3977 dyn
.d_un
.d_ptr
= o
->vma
;
3978 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3985 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3990 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3992 Elf_Internal_Shdr
*hdr
;
3994 hdr
= elf_elfsections (abfd
)[i
];
3995 if (hdr
->sh_type
== type
3996 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3998 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3999 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4002 if (dyn
.d_un
.d_val
== 0
4003 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4004 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4008 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4014 /* If we have created any dynamic sections, then output them. */
4017 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4020 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4022 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4023 || o
->_raw_size
== 0)
4025 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4027 /* At this point, we are only interested in sections
4028 created by elf_link_create_dynamic_sections. */
4031 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4033 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4035 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4036 o
->contents
, o
->output_offset
,
4044 /* The contents of the .dynstr section are actually in a
4046 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4047 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4048 || ! _bfd_stringtab_emit (abfd
,
4049 elf_hash_table (info
)->dynstr
))
4055 /* If we have optimized stabs strings, output them. */
4056 if (elf_hash_table (info
)->stab_info
!= NULL
)
4058 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4062 if (finfo
.symstrtab
!= NULL
)
4063 _bfd_stringtab_free (finfo
.symstrtab
);
4064 if (finfo
.contents
!= NULL
)
4065 free (finfo
.contents
);
4066 if (finfo
.external_relocs
!= NULL
)
4067 free (finfo
.external_relocs
);
4068 if (finfo
.internal_relocs
!= NULL
)
4069 free (finfo
.internal_relocs
);
4070 if (finfo
.external_syms
!= NULL
)
4071 free (finfo
.external_syms
);
4072 if (finfo
.internal_syms
!= NULL
)
4073 free (finfo
.internal_syms
);
4074 if (finfo
.indices
!= NULL
)
4075 free (finfo
.indices
);
4076 if (finfo
.sections
!= NULL
)
4077 free (finfo
.sections
);
4078 if (finfo
.symbuf
!= NULL
)
4079 free (finfo
.symbuf
);
4080 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4082 if ((o
->flags
& SEC_RELOC
) != 0
4083 && elf_section_data (o
)->rel_hashes
!= NULL
)
4084 free (elf_section_data (o
)->rel_hashes
);
4087 elf_tdata (abfd
)->linker
= true;
4092 if (finfo
.symstrtab
!= NULL
)
4093 _bfd_stringtab_free (finfo
.symstrtab
);
4094 if (finfo
.contents
!= NULL
)
4095 free (finfo
.contents
);
4096 if (finfo
.external_relocs
!= NULL
)
4097 free (finfo
.external_relocs
);
4098 if (finfo
.internal_relocs
!= NULL
)
4099 free (finfo
.internal_relocs
);
4100 if (finfo
.external_syms
!= NULL
)
4101 free (finfo
.external_syms
);
4102 if (finfo
.internal_syms
!= NULL
)
4103 free (finfo
.internal_syms
);
4104 if (finfo
.indices
!= NULL
)
4105 free (finfo
.indices
);
4106 if (finfo
.sections
!= NULL
)
4107 free (finfo
.sections
);
4108 if (finfo
.symbuf
!= NULL
)
4109 free (finfo
.symbuf
);
4110 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4112 if ((o
->flags
& SEC_RELOC
) != 0
4113 && elf_section_data (o
)->rel_hashes
!= NULL
)
4114 free (elf_section_data (o
)->rel_hashes
);
4120 /* Add a symbol to the output symbol table. */
4123 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4124 struct elf_final_link_info
*finfo
;
4126 Elf_Internal_Sym
*elfsym
;
4127 asection
*input_sec
;
4129 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4130 struct bfd_link_info
*info
,
4135 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4136 elf_backend_link_output_symbol_hook
;
4137 if (output_symbol_hook
!= NULL
)
4139 if (! ((*output_symbol_hook
)
4140 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4144 if (name
== (const char *) NULL
|| *name
== '\0')
4145 elfsym
->st_name
= 0;
4148 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4151 if (elfsym
->st_name
== (unsigned long) -1)
4155 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4157 if (! elf_link_flush_output_syms (finfo
))
4161 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4162 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4163 ++finfo
->symbuf_count
;
4165 ++finfo
->output_bfd
->symcount
;
4170 /* Flush the output symbols to the file. */
4173 elf_link_flush_output_syms (finfo
)
4174 struct elf_final_link_info
*finfo
;
4176 if (finfo
->symbuf_count
> 0)
4178 Elf_Internal_Shdr
*symtab
;
4180 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4182 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4184 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4185 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4186 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4189 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4191 finfo
->symbuf_count
= 0;
4197 /* Add an external symbol to the symbol table. This is called from
4198 the hash table traversal routine. When generating a shared object,
4199 we go through the symbol table twice. The first time we output
4200 anything that might have been forced to local scope in a version
4201 script. The second time we output the symbols that are still
4205 elf_link_output_extsym (h
, data
)
4206 struct elf_link_hash_entry
*h
;
4209 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4210 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4212 Elf_Internal_Sym sym
;
4213 asection
*input_sec
;
4215 /* Decide whether to output this symbol in this pass. */
4216 if (eoinfo
->localsyms
)
4218 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4223 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4227 /* If we are not creating a shared library, and this symbol is
4228 referenced by a shared library but is not defined anywhere, then
4229 warn that it is undefined. If we do not do this, the runtime
4230 linker will complain that the symbol is undefined when the
4231 program is run. We don't have to worry about symbols that are
4232 referenced by regular files, because we will already have issued
4233 warnings for them. */
4234 if (! finfo
->info
->relocateable
4235 && ! finfo
->info
->shared
4236 && h
->root
.type
== bfd_link_hash_undefined
4237 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4238 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4240 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4241 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4242 (asection
*) NULL
, 0)))
4244 eoinfo
->failed
= true;
4249 /* We don't want to output symbols that have never been mentioned by
4250 a regular file, or that we have been told to strip. However, if
4251 h->indx is set to -2, the symbol is used by a reloc and we must
4255 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4256 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4257 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4258 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4260 else if (finfo
->info
->strip
== strip_all
4261 || (finfo
->info
->strip
== strip_some
4262 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4263 h
->root
.root
.string
,
4264 false, false) == NULL
))
4269 /* If we're stripping it, and it's not a dynamic symbol, there's
4270 nothing else to do. */
4271 if (strip
&& h
->dynindx
== -1)
4275 sym
.st_size
= h
->size
;
4276 sym
.st_other
= h
->other
;
4277 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4278 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4279 else if (h
->root
.type
== bfd_link_hash_undefweak
4280 || h
->root
.type
== bfd_link_hash_defweak
)
4281 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4283 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4285 switch (h
->root
.type
)
4288 case bfd_link_hash_new
:
4292 case bfd_link_hash_undefined
:
4293 input_sec
= bfd_und_section_ptr
;
4294 sym
.st_shndx
= SHN_UNDEF
;
4297 case bfd_link_hash_undefweak
:
4298 input_sec
= bfd_und_section_ptr
;
4299 sym
.st_shndx
= SHN_UNDEF
;
4302 case bfd_link_hash_defined
:
4303 case bfd_link_hash_defweak
:
4305 input_sec
= h
->root
.u
.def
.section
;
4306 if (input_sec
->output_section
!= NULL
)
4309 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4310 input_sec
->output_section
);
4311 if (sym
.st_shndx
== (unsigned short) -1)
4313 (*_bfd_error_handler
)
4314 (_("%s: could not find output section %s for input section %s"),
4315 bfd_get_filename (finfo
->output_bfd
),
4316 input_sec
->output_section
->name
,
4318 eoinfo
->failed
= true;
4322 /* ELF symbols in relocateable files are section relative,
4323 but in nonrelocateable files they are virtual
4325 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4326 if (! finfo
->info
->relocateable
)
4327 sym
.st_value
+= input_sec
->output_section
->vma
;
4331 BFD_ASSERT (input_sec
->owner
== NULL
4332 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4333 sym
.st_shndx
= SHN_UNDEF
;
4334 input_sec
= bfd_und_section_ptr
;
4339 case bfd_link_hash_common
:
4340 input_sec
= h
->root
.u
.c
.p
->section
;
4341 sym
.st_shndx
= SHN_COMMON
;
4342 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4345 case bfd_link_hash_indirect
:
4346 /* These symbols are created by symbol versioning. They point
4347 to the decorated version of the name. For example, if the
4348 symbol foo@@GNU_1.2 is the default, which should be used when
4349 foo is used with no version, then we add an indirect symbol
4350 foo which points to foo@@GNU_1.2. We ignore these symbols,
4351 since the indirected symbol is already in the hash table. If
4352 the indirect symbol is non-ELF, fall through and output it. */
4353 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4357 case bfd_link_hash_warning
:
4358 /* We can't represent these symbols in ELF, although a warning
4359 symbol may have come from a .gnu.warning.SYMBOL section. We
4360 just put the target symbol in the hash table. If the target
4361 symbol does not really exist, don't do anything. */
4362 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4364 return (elf_link_output_extsym
4365 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4368 /* Give the processor backend a chance to tweak the symbol value,
4369 and also to finish up anything that needs to be done for this
4371 if ((h
->dynindx
!= -1
4372 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4373 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4375 struct elf_backend_data
*bed
;
4377 bed
= get_elf_backend_data (finfo
->output_bfd
);
4378 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4379 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4381 eoinfo
->failed
= true;
4386 /* If this symbol should be put in the .dynsym section, then put it
4387 there now. We have already know the symbol index. We also fill
4388 in the entry in the .hash section. */
4389 if (h
->dynindx
!= -1
4390 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4396 bfd_byte
*bucketpos
;
4399 sym
.st_name
= h
->dynstr_index
;
4401 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4402 (PTR
) (((Elf_External_Sym
*)
4403 finfo
->dynsym_sec
->contents
)
4406 /* We didn't include the version string in the dynamic string
4407 table, so we must not consider it in the hash table. */
4408 name
= h
->root
.root
.string
;
4409 p
= strchr (name
, ELF_VER_CHR
);
4414 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4415 strncpy (copy
, name
, p
- name
);
4416 copy
[p
- name
] = '\0';
4420 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4421 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4422 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4423 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4424 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4425 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4426 put_word (finfo
->output_bfd
, chain
,
4427 ((bfd_byte
*) finfo
->hash_sec
->contents
4428 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4431 bfd_release (finfo
->output_bfd
, copy
);
4433 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4435 Elf_Internal_Versym iversym
;
4437 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4439 if (h
->verinfo
.verdef
== NULL
)
4440 iversym
.vs_vers
= 0;
4442 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4446 if (h
->verinfo
.vertree
== NULL
)
4447 iversym
.vs_vers
= 1;
4449 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4452 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4453 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4455 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4456 (((Elf_External_Versym
*)
4457 finfo
->symver_sec
->contents
)
4462 /* If we're stripping it, then it was just a dynamic symbol, and
4463 there's nothing else to do. */
4467 h
->indx
= finfo
->output_bfd
->symcount
;
4469 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4471 eoinfo
->failed
= true;
4478 /* Link an input file into the linker output file. This function
4479 handles all the sections and relocations of the input file at once.
4480 This is so that we only have to read the local symbols once, and
4481 don't have to keep them in memory. */
4484 elf_link_input_bfd (finfo
, input_bfd
)
4485 struct elf_final_link_info
*finfo
;
4488 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4489 bfd
*, asection
*, bfd_byte
*,
4490 Elf_Internal_Rela
*,
4491 Elf_Internal_Sym
*, asection
**));
4493 Elf_Internal_Shdr
*symtab_hdr
;
4496 Elf_External_Sym
*external_syms
;
4497 Elf_External_Sym
*esym
;
4498 Elf_External_Sym
*esymend
;
4499 Elf_Internal_Sym
*isym
;
4501 asection
**ppsection
;
4504 output_bfd
= finfo
->output_bfd
;
4506 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4508 /* If this is a dynamic object, we don't want to do anything here:
4509 we don't want the local symbols, and we don't want the section
4511 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4514 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4515 if (elf_bad_symtab (input_bfd
))
4517 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4522 locsymcount
= symtab_hdr
->sh_info
;
4523 extsymoff
= symtab_hdr
->sh_info
;
4526 /* Read the local symbols. */
4527 if (symtab_hdr
->contents
!= NULL
)
4528 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4529 else if (locsymcount
== 0)
4530 external_syms
= NULL
;
4533 external_syms
= finfo
->external_syms
;
4534 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4535 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4536 locsymcount
, input_bfd
)
4537 != locsymcount
* sizeof (Elf_External_Sym
)))
4541 /* Swap in the local symbols and write out the ones which we know
4542 are going into the output file. */
4543 esym
= external_syms
;
4544 esymend
= esym
+ locsymcount
;
4545 isym
= finfo
->internal_syms
;
4546 pindex
= finfo
->indices
;
4547 ppsection
= finfo
->sections
;
4548 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4552 Elf_Internal_Sym osym
;
4554 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4557 if (elf_bad_symtab (input_bfd
))
4559 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4566 if (isym
->st_shndx
== SHN_UNDEF
)
4567 isec
= bfd_und_section_ptr
;
4568 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4569 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4570 else if (isym
->st_shndx
== SHN_ABS
)
4571 isec
= bfd_abs_section_ptr
;
4572 else if (isym
->st_shndx
== SHN_COMMON
)
4573 isec
= bfd_com_section_ptr
;
4582 /* Don't output the first, undefined, symbol. */
4583 if (esym
== external_syms
)
4586 /* If we are stripping all symbols, we don't want to output this
4588 if (finfo
->info
->strip
== strip_all
)
4591 /* We never output section symbols. Instead, we use the section
4592 symbol of the corresponding section in the output file. */
4593 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4596 /* If we are discarding all local symbols, we don't want to
4597 output this one. If we are generating a relocateable output
4598 file, then some of the local symbols may be required by
4599 relocs; we output them below as we discover that they are
4601 if (finfo
->info
->discard
== discard_all
)
4604 /* If this symbol is defined in a section which we are
4605 discarding, we don't need to keep it, but note that
4606 linker_mark is only reliable for sections that have contents.
4607 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4608 as well as linker_mark. */
4609 if (isym
->st_shndx
> 0
4610 && isym
->st_shndx
< SHN_LORESERVE
4612 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4613 || (! finfo
->info
->relocateable
4614 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4617 /* Get the name of the symbol. */
4618 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4623 /* See if we are discarding symbols with this name. */
4624 if ((finfo
->info
->strip
== strip_some
4625 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4627 || (finfo
->info
->discard
== discard_l
4628 && bfd_is_local_label_name (input_bfd
, name
)))
4631 /* If we get here, we are going to output this symbol. */
4635 /* Adjust the section index for the output file. */
4636 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4637 isec
->output_section
);
4638 if (osym
.st_shndx
== (unsigned short) -1)
4641 *pindex
= output_bfd
->symcount
;
4643 /* ELF symbols in relocateable files are section relative, but
4644 in executable files they are virtual addresses. Note that
4645 this code assumes that all ELF sections have an associated
4646 BFD section with a reasonable value for output_offset; below
4647 we assume that they also have a reasonable value for
4648 output_section. Any special sections must be set up to meet
4649 these requirements. */
4650 osym
.st_value
+= isec
->output_offset
;
4651 if (! finfo
->info
->relocateable
)
4652 osym
.st_value
+= isec
->output_section
->vma
;
4654 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4658 /* Relocate the contents of each section. */
4659 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4663 if (! o
->linker_mark
)
4665 /* This section was omitted from the link. */
4669 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4670 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4673 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4675 /* Section was created by elf_link_create_dynamic_sections
4680 /* Get the contents of the section. They have been cached by a
4681 relaxation routine. Note that o is a section in an input
4682 file, so the contents field will not have been set by any of
4683 the routines which work on output files. */
4684 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4685 contents
= elf_section_data (o
)->this_hdr
.contents
;
4688 contents
= finfo
->contents
;
4689 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4690 (file_ptr
) 0, o
->_raw_size
))
4694 if ((o
->flags
& SEC_RELOC
) != 0)
4696 Elf_Internal_Rela
*internal_relocs
;
4698 /* Get the swapped relocs. */
4699 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4700 (input_bfd
, o
, finfo
->external_relocs
,
4701 finfo
->internal_relocs
, false));
4702 if (internal_relocs
== NULL
4703 && o
->reloc_count
> 0)
4706 /* Relocate the section by invoking a back end routine.
4708 The back end routine is responsible for adjusting the
4709 section contents as necessary, and (if using Rela relocs
4710 and generating a relocateable output file) adjusting the
4711 reloc addend as necessary.
4713 The back end routine does not have to worry about setting
4714 the reloc address or the reloc symbol index.
4716 The back end routine is given a pointer to the swapped in
4717 internal symbols, and can access the hash table entries
4718 for the external symbols via elf_sym_hashes (input_bfd).
4720 When generating relocateable output, the back end routine
4721 must handle STB_LOCAL/STT_SECTION symbols specially. The
4722 output symbol is going to be a section symbol
4723 corresponding to the output section, which will require
4724 the addend to be adjusted. */
4726 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4727 input_bfd
, o
, contents
,
4729 finfo
->internal_syms
,
4733 if (finfo
->info
->relocateable
)
4735 Elf_Internal_Rela
*irela
;
4736 Elf_Internal_Rela
*irelaend
;
4737 struct elf_link_hash_entry
**rel_hash
;
4738 Elf_Internal_Shdr
*input_rel_hdr
;
4739 Elf_Internal_Shdr
*output_rel_hdr
;
4741 /* Adjust the reloc addresses and symbol indices. */
4743 irela
= internal_relocs
;
4744 irelaend
= irela
+ o
->reloc_count
;
4745 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4746 + o
->output_section
->reloc_count
);
4747 for (; irela
< irelaend
; irela
++, rel_hash
++)
4749 unsigned long r_symndx
;
4750 Elf_Internal_Sym
*isym
;
4753 irela
->r_offset
+= o
->output_offset
;
4755 r_symndx
= ELF_R_SYM (irela
->r_info
);
4760 if (r_symndx
>= locsymcount
4761 || (elf_bad_symtab (input_bfd
)
4762 && finfo
->sections
[r_symndx
] == NULL
))
4764 struct elf_link_hash_entry
*rh
;
4767 /* This is a reloc against a global symbol. We
4768 have not yet output all the local symbols, so
4769 we do not know the symbol index of any global
4770 symbol. We set the rel_hash entry for this
4771 reloc to point to the global hash table entry
4772 for this symbol. The symbol index is then
4773 set at the end of elf_bfd_final_link. */
4774 indx
= r_symndx
- extsymoff
;
4775 rh
= elf_sym_hashes (input_bfd
)[indx
];
4776 while (rh
->root
.type
== bfd_link_hash_indirect
4777 || rh
->root
.type
== bfd_link_hash_warning
)
4778 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
4780 /* Setting the index to -2 tells
4781 elf_link_output_extsym that this symbol is
4783 BFD_ASSERT (rh
->indx
< 0);
4791 /* This is a reloc against a local symbol. */
4794 isym
= finfo
->internal_syms
+ r_symndx
;
4795 sec
= finfo
->sections
[r_symndx
];
4796 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4798 /* I suppose the backend ought to fill in the
4799 section of any STT_SECTION symbol against a
4800 processor specific section. If we have
4801 discarded a section, the output_section will
4802 be the absolute section. */
4804 && (bfd_is_abs_section (sec
)
4805 || (sec
->output_section
!= NULL
4806 && bfd_is_abs_section (sec
->output_section
))))
4808 else if (sec
== NULL
|| sec
->owner
== NULL
)
4810 bfd_set_error (bfd_error_bad_value
);
4815 r_symndx
= sec
->output_section
->target_index
;
4816 BFD_ASSERT (r_symndx
!= 0);
4821 if (finfo
->indices
[r_symndx
] == -1)
4827 if (finfo
->info
->strip
== strip_all
)
4829 /* You can't do ld -r -s. */
4830 bfd_set_error (bfd_error_invalid_operation
);
4834 /* This symbol was skipped earlier, but
4835 since it is needed by a reloc, we
4836 must output it now. */
4837 link
= symtab_hdr
->sh_link
;
4838 name
= bfd_elf_string_from_elf_section (input_bfd
,
4844 osec
= sec
->output_section
;
4846 _bfd_elf_section_from_bfd_section (output_bfd
,
4848 if (isym
->st_shndx
== (unsigned short) -1)
4851 isym
->st_value
+= sec
->output_offset
;
4852 if (! finfo
->info
->relocateable
)
4853 isym
->st_value
+= osec
->vma
;
4855 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4857 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4861 r_symndx
= finfo
->indices
[r_symndx
];
4864 irela
->r_info
= ELF_R_INFO (r_symndx
,
4865 ELF_R_TYPE (irela
->r_info
));
4868 /* Swap out the relocs. */
4869 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4870 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4871 BFD_ASSERT (output_rel_hdr
->sh_entsize
4872 == input_rel_hdr
->sh_entsize
);
4873 irela
= internal_relocs
;
4874 irelaend
= irela
+ o
->reloc_count
;
4875 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4877 Elf_External_Rel
*erel
;
4879 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4880 + o
->output_section
->reloc_count
);
4881 for (; irela
< irelaend
; irela
++, erel
++)
4883 Elf_Internal_Rel irel
;
4885 irel
.r_offset
= irela
->r_offset
;
4886 irel
.r_info
= irela
->r_info
;
4887 BFD_ASSERT (irela
->r_addend
== 0);
4888 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4893 Elf_External_Rela
*erela
;
4895 BFD_ASSERT (input_rel_hdr
->sh_entsize
4896 == sizeof (Elf_External_Rela
));
4897 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4898 + o
->output_section
->reloc_count
);
4899 for (; irela
< irelaend
; irela
++, erela
++)
4900 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4903 o
->output_section
->reloc_count
+= o
->reloc_count
;
4907 /* Write out the modified section contents. */
4908 if (elf_section_data (o
)->stab_info
== NULL
)
4910 if (! (o
->flags
& SEC_EXCLUDE
) &&
4911 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
4912 contents
, o
->output_offset
,
4913 (o
->_cooked_size
!= 0
4920 if (! (_bfd_write_section_stabs
4921 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4922 o
, &elf_section_data (o
)->stab_info
, contents
)))
4930 /* Generate a reloc when linking an ELF file. This is a reloc
4931 requested by the linker, and does come from any input file. This
4932 is used to build constructor and destructor tables when linking
4936 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4938 struct bfd_link_info
*info
;
4939 asection
*output_section
;
4940 struct bfd_link_order
*link_order
;
4942 reloc_howto_type
*howto
;
4946 struct elf_link_hash_entry
**rel_hash_ptr
;
4947 Elf_Internal_Shdr
*rel_hdr
;
4949 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4952 bfd_set_error (bfd_error_bad_value
);
4956 addend
= link_order
->u
.reloc
.p
->addend
;
4958 /* Figure out the symbol index. */
4959 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4960 + output_section
->reloc_count
);
4961 if (link_order
->type
== bfd_section_reloc_link_order
)
4963 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4964 BFD_ASSERT (indx
!= 0);
4965 *rel_hash_ptr
= NULL
;
4969 struct elf_link_hash_entry
*h
;
4971 /* Treat a reloc against a defined symbol as though it were
4972 actually against the section. */
4973 h
= ((struct elf_link_hash_entry
*)
4974 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4975 link_order
->u
.reloc
.p
->u
.name
,
4976 false, false, true));
4978 && (h
->root
.type
== bfd_link_hash_defined
4979 || h
->root
.type
== bfd_link_hash_defweak
))
4983 section
= h
->root
.u
.def
.section
;
4984 indx
= section
->output_section
->target_index
;
4985 *rel_hash_ptr
= NULL
;
4986 /* It seems that we ought to add the symbol value to the
4987 addend here, but in practice it has already been added
4988 because it was passed to constructor_callback. */
4989 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4993 /* Setting the index to -2 tells elf_link_output_extsym that
4994 this symbol is used by a reloc. */
5001 if (! ((*info
->callbacks
->unattached_reloc
)
5002 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5003 (asection
*) NULL
, (bfd_vma
) 0)))
5009 /* If this is an inplace reloc, we must write the addend into the
5011 if (howto
->partial_inplace
&& addend
!= 0)
5014 bfd_reloc_status_type rstat
;
5018 size
= bfd_get_reloc_size (howto
);
5019 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5020 if (buf
== (bfd_byte
*) NULL
)
5022 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5028 case bfd_reloc_outofrange
:
5030 case bfd_reloc_overflow
:
5031 if (! ((*info
->callbacks
->reloc_overflow
)
5033 (link_order
->type
== bfd_section_reloc_link_order
5034 ? bfd_section_name (output_bfd
,
5035 link_order
->u
.reloc
.p
->u
.section
)
5036 : link_order
->u
.reloc
.p
->u
.name
),
5037 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5045 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5046 (file_ptr
) link_order
->offset
, size
);
5052 /* The address of a reloc is relative to the section in a
5053 relocateable file, and is a virtual address in an executable
5055 offset
= link_order
->offset
;
5056 if (! info
->relocateable
)
5057 offset
+= output_section
->vma
;
5059 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5061 if (rel_hdr
->sh_type
== SHT_REL
)
5063 Elf_Internal_Rel irel
;
5064 Elf_External_Rel
*erel
;
5066 irel
.r_offset
= offset
;
5067 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5068 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5069 + output_section
->reloc_count
);
5070 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5074 Elf_Internal_Rela irela
;
5075 Elf_External_Rela
*erela
;
5077 irela
.r_offset
= offset
;
5078 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5079 irela
.r_addend
= addend
;
5080 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5081 + output_section
->reloc_count
);
5082 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5085 ++output_section
->reloc_count
;
5091 /* Allocate a pointer to live in a linker created section. */
5094 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5096 struct bfd_link_info
*info
;
5097 elf_linker_section_t
*lsect
;
5098 struct elf_link_hash_entry
*h
;
5099 const Elf_Internal_Rela
*rel
;
5101 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5102 elf_linker_section_pointers_t
*linker_section_ptr
;
5103 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5105 BFD_ASSERT (lsect
!= NULL
);
5107 /* Is this a global symbol? */
5110 /* Has this symbol already been allocated, if so, our work is done */
5111 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5116 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5117 /* Make sure this symbol is output as a dynamic symbol. */
5118 if (h
->dynindx
== -1)
5120 if (! elf_link_record_dynamic_symbol (info
, h
))
5124 if (lsect
->rel_section
)
5125 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5128 else /* Allocation of a pointer to a local symbol */
5130 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5132 /* Allocate a table to hold the local symbols if first time */
5135 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5136 register unsigned int i
;
5138 ptr
= (elf_linker_section_pointers_t
**)
5139 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5144 elf_local_ptr_offsets (abfd
) = ptr
;
5145 for (i
= 0; i
< num_symbols
; i
++)
5146 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5149 /* Has this symbol already been allocated, if so, our work is done */
5150 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5155 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5159 /* If we are generating a shared object, we need to
5160 output a R_<xxx>_RELATIVE reloc so that the
5161 dynamic linker can adjust this GOT entry. */
5162 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5163 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5167 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5168 from internal memory. */
5169 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5170 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5171 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5173 if (!linker_section_ptr
)
5176 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5177 linker_section_ptr
->addend
= rel
->r_addend
;
5178 linker_section_ptr
->which
= lsect
->which
;
5179 linker_section_ptr
->written_address_p
= false;
5180 *ptr_linker_section_ptr
= linker_section_ptr
;
5183 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5185 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5186 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5187 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5188 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5190 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5192 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5193 lsect
->sym_hash
->root
.root
.string
,
5194 (long)ARCH_SIZE
/ 8,
5195 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5201 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5203 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5206 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5207 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5215 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5218 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5221 /* Fill in the address for a pointer generated in alinker section. */
5224 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5227 struct bfd_link_info
*info
;
5228 elf_linker_section_t
*lsect
;
5229 struct elf_link_hash_entry
*h
;
5231 const Elf_Internal_Rela
*rel
;
5234 elf_linker_section_pointers_t
*linker_section_ptr
;
5236 BFD_ASSERT (lsect
!= NULL
);
5238 if (h
!= NULL
) /* global symbol */
5240 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5244 BFD_ASSERT (linker_section_ptr
!= NULL
);
5246 if (! elf_hash_table (info
)->dynamic_sections_created
5249 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5251 /* This is actually a static link, or it is a
5252 -Bsymbolic link and the symbol is defined
5253 locally. We must initialize this entry in the
5256 When doing a dynamic link, we create a .rela.<xxx>
5257 relocation entry to initialize the value. This
5258 is done in the finish_dynamic_symbol routine. */
5259 if (!linker_section_ptr
->written_address_p
)
5261 linker_section_ptr
->written_address_p
= true;
5262 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5263 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5267 else /* local symbol */
5269 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5270 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5271 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5272 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5276 BFD_ASSERT (linker_section_ptr
!= NULL
);
5278 /* Write out pointer if it hasn't been rewritten out before */
5279 if (!linker_section_ptr
->written_address_p
)
5281 linker_section_ptr
->written_address_p
= true;
5282 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5283 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5287 asection
*srel
= lsect
->rel_section
;
5288 Elf_Internal_Rela outrel
;
5290 /* We need to generate a relative reloc for the dynamic linker. */
5292 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5295 BFD_ASSERT (srel
!= NULL
);
5297 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5298 + lsect
->section
->output_offset
5299 + linker_section_ptr
->offset
);
5300 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5301 outrel
.r_addend
= 0;
5302 elf_swap_reloca_out (output_bfd
, &outrel
,
5303 (((Elf_External_Rela
*)
5304 lsect
->section
->contents
)
5305 + lsect
->section
->reloc_count
));
5306 ++lsect
->section
->reloc_count
;
5311 relocation
= (lsect
->section
->output_offset
5312 + linker_section_ptr
->offset
5313 - lsect
->hole_offset
5314 - lsect
->sym_offset
);
5317 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5318 lsect
->name
, (long)relocation
, (long)relocation
);
5321 /* Subtract out the addend, because it will get added back in by the normal
5323 return relocation
- linker_section_ptr
->addend
;
5326 /* Garbage collect unused sections. */
5328 static boolean elf_gc_mark
5329 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5330 asection
* (*gc_mark_hook
)
5331 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5332 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5334 static boolean elf_gc_sweep
5335 PARAMS ((struct bfd_link_info
*info
,
5336 boolean (*gc_sweep_hook
)
5337 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5338 const Elf_Internal_Rela
*relocs
))));
5340 static boolean elf_gc_sweep_symbol
5341 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5343 static boolean elf_gc_allocate_got_offsets
5344 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5346 static boolean elf_gc_propagate_vtable_entries_used
5347 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5349 static boolean elf_gc_smash_unused_vtentry_relocs
5350 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5352 /* The mark phase of garbage collection. For a given section, mark
5353 it, and all the sections which define symbols to which it refers. */
5356 elf_gc_mark (info
, sec
, gc_mark_hook
)
5357 struct bfd_link_info
*info
;
5359 asection
* (*gc_mark_hook
)
5360 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5361 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5367 /* Look through the section relocs. */
5369 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5371 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5372 Elf_Internal_Shdr
*symtab_hdr
;
5373 struct elf_link_hash_entry
**sym_hashes
;
5376 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5377 bfd
*input_bfd
= sec
->owner
;
5379 /* GCFIXME: how to arrange so that relocs and symbols are not
5380 reread continually? */
5382 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5383 sym_hashes
= elf_sym_hashes (input_bfd
);
5385 /* Read the local symbols. */
5386 if (elf_bad_symtab (input_bfd
))
5388 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5392 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5393 if (symtab_hdr
->contents
)
5394 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5395 else if (nlocsyms
== 0)
5399 locsyms
= freesyms
=
5400 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5401 if (freesyms
== NULL
5402 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5403 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5404 nlocsyms
, input_bfd
)
5405 != nlocsyms
* sizeof (Elf_External_Sym
)))
5412 /* Read the relocations. */
5413 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5414 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5415 info
->keep_memory
));
5416 if (relstart
== NULL
)
5421 relend
= relstart
+ sec
->reloc_count
;
5423 for (rel
= relstart
; rel
< relend
; rel
++)
5425 unsigned long r_symndx
;
5427 struct elf_link_hash_entry
*h
;
5430 r_symndx
= ELF_R_SYM (rel
->r_info
);
5434 if (elf_bad_symtab (sec
->owner
))
5436 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5437 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5438 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5441 h
= sym_hashes
[r_symndx
- extsymoff
];
5442 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5445 else if (r_symndx
>= nlocsyms
)
5447 h
= sym_hashes
[r_symndx
- extsymoff
];
5448 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5452 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5453 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5456 if (rsec
&& !rsec
->gc_mark
)
5457 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5465 if (!info
->keep_memory
)
5475 /* The sweep phase of garbage collection. Remove all garbage sections. */
5478 elf_gc_sweep (info
, gc_sweep_hook
)
5479 struct bfd_link_info
*info
;
5480 boolean (*gc_sweep_hook
)
5481 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5482 const Elf_Internal_Rela
*relocs
));
5486 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5490 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5492 /* Keep special sections. Keep .debug sections. */
5493 if ((o
->flags
& SEC_LINKER_CREATED
)
5494 || (o
->flags
& SEC_DEBUGGING
))
5500 /* Skip sweeping sections already excluded. */
5501 if (o
->flags
& SEC_EXCLUDE
)
5504 /* Since this is early in the link process, it is simple
5505 to remove a section from the output. */
5506 o
->flags
|= SEC_EXCLUDE
;
5508 /* But we also have to update some of the relocation
5509 info we collected before. */
5511 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5513 Elf_Internal_Rela
*internal_relocs
;
5516 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5517 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5518 if (internal_relocs
== NULL
)
5521 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5523 if (!info
->keep_memory
)
5524 free (internal_relocs
);
5532 /* Remove the symbols that were in the swept sections from the dynamic
5533 symbol table. GCFIXME: Anyone know how to get them out of the
5534 static symbol table as well? */
5538 elf_link_hash_traverse (elf_hash_table (info
),
5539 elf_gc_sweep_symbol
,
5542 elf_hash_table (info
)->dynsymcount
= i
;
5548 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5551 elf_gc_sweep_symbol (h
, idxptr
)
5552 struct elf_link_hash_entry
*h
;
5555 int *idx
= (int *) idxptr
;
5557 if (h
->dynindx
!= -1
5558 && ((h
->root
.type
!= bfd_link_hash_defined
5559 && h
->root
.type
!= bfd_link_hash_defweak
)
5560 || h
->root
.u
.def
.section
->gc_mark
))
5561 h
->dynindx
= (*idx
)++;
5566 /* Propogate collected vtable information. This is called through
5567 elf_link_hash_traverse. */
5570 elf_gc_propagate_vtable_entries_used (h
, okp
)
5571 struct elf_link_hash_entry
*h
;
5574 /* Those that are not vtables. */
5575 if (h
->vtable_parent
== NULL
)
5578 /* Those vtables that do not have parents, we cannot merge. */
5579 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5582 /* If we've already been done, exit. */
5583 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5586 /* Make sure the parent's table is up to date. */
5587 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5589 if (h
->vtable_entries_used
== NULL
)
5591 /* None of this table's entries were referenced. Re-use the
5593 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5600 /* Or the parent's entries into ours. */
5601 cu
= h
->vtable_entries_used
;
5603 pu
= h
->vtable_parent
->vtable_entries_used
;
5606 n
= h
->vtable_parent
->size
/ FILE_ALIGN
;
5609 if (*pu
) *cu
= true;
5619 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5620 struct elf_link_hash_entry
*h
;
5624 bfd_vma hstart
, hend
;
5625 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5627 /* Take care of both those symbols that do not describe vtables as
5628 well as those that are not loaded. */
5629 if (h
->vtable_parent
== NULL
)
5632 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5633 || h
->root
.type
== bfd_link_hash_defweak
);
5635 sec
= h
->root
.u
.def
.section
;
5636 hstart
= h
->root
.u
.def
.value
;
5637 hend
= hstart
+ h
->size
;
5639 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5640 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5642 return *(boolean
*)okp
= false;
5643 relend
= relstart
+ sec
->reloc_count
;
5645 for (rel
= relstart
; rel
< relend
; ++rel
)
5646 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5648 /* If the entry is in use, do nothing. */
5649 if (h
->vtable_entries_used
)
5651 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5652 if (h
->vtable_entries_used
[entry
])
5655 /* Otherwise, kill it. */
5656 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5662 /* Do mark and sweep of unused sections. */
5665 elf_gc_sections (abfd
, info
)
5667 struct bfd_link_info
*info
;
5671 asection
* (*gc_mark_hook
)
5672 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5673 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5675 if (!get_elf_backend_data (abfd
)->can_gc_sections
5676 || info
->relocateable
)
5679 /* Apply transitive closure to the vtable entry usage info. */
5680 elf_link_hash_traverse (elf_hash_table (info
),
5681 elf_gc_propagate_vtable_entries_used
,
5686 /* Kill the vtable relocations that were not used. */
5687 elf_link_hash_traverse (elf_hash_table (info
),
5688 elf_gc_smash_unused_vtentry_relocs
,
5693 /* Grovel through relocs to find out who stays ... */
5695 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5696 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5699 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5701 if (o
->flags
& SEC_KEEP
)
5702 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5707 /* ... and mark SEC_EXCLUDE for those that go. */
5708 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5714 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5717 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5720 struct elf_link_hash_entry
*h
;
5723 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5724 struct elf_link_hash_entry
**search
, *child
;
5725 bfd_size_type extsymcount
;
5727 /* The sh_info field of the symtab header tells us where the
5728 external symbols start. We don't care about the local symbols at
5730 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5731 if (!elf_bad_symtab (abfd
))
5732 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5734 sym_hashes
= elf_sym_hashes (abfd
);
5735 sym_hashes_end
= sym_hashes
+ extsymcount
;
5737 /* Hunt down the child symbol, which is in this section at the same
5738 offset as the relocation. */
5739 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5741 if ((child
= *search
) != NULL
5742 && (child
->root
.type
== bfd_link_hash_defined
5743 || child
->root
.type
== bfd_link_hash_defweak
)
5744 && child
->root
.u
.def
.section
== sec
5745 && child
->root
.u
.def
.value
== offset
)
5749 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5750 bfd_get_filename (abfd
), sec
->name
,
5751 (unsigned long)offset
);
5752 bfd_set_error (bfd_error_invalid_operation
);
5758 /* This *should* only be the absolute section. It could potentially
5759 be that someone has defined a non-global vtable though, which
5760 would be bad. It isn't worth paging in the local symbols to be
5761 sure though; that case should simply be handled by the assembler. */
5763 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
5766 child
->vtable_parent
= h
;
5771 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
5774 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
5777 struct elf_link_hash_entry
*h
;
5780 if (h
->vtable_entries_used
== NULL
)
5782 /* Allocate one extra entry for use as a "done" flag for the
5783 consolidation pass. */
5784 size_t size
= (h
->size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
5785 h
->vtable_entries_used
= (boolean
*) bfd_alloc (abfd
, size
);
5786 if (h
->vtable_entries_used
== NULL
)
5789 /* And arrange for that done flag to be at index -1. */
5790 memset (h
->vtable_entries_used
++, 0, size
);
5792 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
5797 /* And an accompanying bit to work out final got entry offsets once
5798 we're done. Should be called from final_link. */
5801 elf_gc_common_finalize_got_offsets (abfd
, info
)
5803 struct bfd_link_info
*info
;
5806 bfd_vma gotoff
= get_elf_backend_data (abfd
)->got_header_size
;
5808 /* Do the local .got entries first. */
5809 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
5811 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
5812 bfd_size_type j
, locsymcount
;
5813 Elf_Internal_Shdr
*symtab_hdr
;
5818 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
5819 if (elf_bad_symtab (i
))
5820 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5822 locsymcount
= symtab_hdr
->sh_info
;
5824 for (j
= 0; j
< locsymcount
; ++j
)
5826 if (local_got
[j
] > 0)
5828 local_got
[j
] = gotoff
;
5829 gotoff
+= ARCH_SIZE
/ 8;
5832 local_got
[j
] = (bfd_vma
) -1;
5836 /* Then the global .got and .plt entries. */
5837 elf_link_hash_traverse (elf_hash_table (info
),
5838 elf_gc_allocate_got_offsets
,
5843 /* We need a special top-level link routine to convert got reference counts
5844 to real got offsets. */
5847 elf_gc_allocate_got_offsets (h
, offarg
)
5848 struct elf_link_hash_entry
*h
;
5851 bfd_vma
*off
= (bfd_vma
*) offarg
;
5853 if (h
->got
.refcount
> 0)
5855 h
->got
.offset
= off
[0];
5856 off
[0] += ARCH_SIZE
/ 8;
5859 h
->got
.offset
= (bfd_vma
) -1;
5864 /* Many folk need no more in the way of final link than this, once
5865 got entry reference counting is enabled. */
5868 elf_gc_common_final_link (abfd
, info
)
5870 struct bfd_link_info
*info
;
5872 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
5875 /* Invoke the regular ELF backend linker to do all the work. */
5876 return elf_bfd_final_link (abfd
, info
);