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
+ 1);
724 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
729 if (! (_bfd_generic_link_add_one_symbol
730 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
731 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
734 if (! info
->relocateable
)
736 /* Clobber the section size so that the warning does
737 not get copied into the output file. */
744 /* If this is a dynamic object, we always link against the .dynsym
745 symbol table, not the .symtab symbol table. The dynamic linker
746 will only see the .dynsym symbol table, so there is no reason to
747 look at .symtab for a dynamic object. */
749 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
750 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
752 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
756 /* Read in any version definitions. */
758 if (! _bfd_elf_slurp_version_tables (abfd
))
761 /* Read in the symbol versions, but don't bother to convert them
762 to internal format. */
763 if (elf_dynversym (abfd
) != 0)
765 Elf_Internal_Shdr
*versymhdr
;
767 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
768 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
769 if (extversym
== NULL
)
771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
772 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
773 != versymhdr
->sh_size
))
778 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
780 /* The sh_info field of the symtab header tells us where the
781 external symbols start. We don't care about the local symbols at
783 if (elf_bad_symtab (abfd
))
785 extsymcount
= symcount
;
790 extsymcount
= symcount
- hdr
->sh_info
;
791 extsymoff
= hdr
->sh_info
;
794 buf
= ((Elf_External_Sym
*)
795 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
796 if (buf
== NULL
&& extsymcount
!= 0)
799 /* We store a pointer to the hash table entry for each external
801 sym_hash
= ((struct elf_link_hash_entry
**)
803 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
804 if (sym_hash
== NULL
)
806 elf_sym_hashes (abfd
) = sym_hash
;
810 /* If we are creating a shared library, create all the dynamic
811 sections immediately. We need to attach them to something,
812 so we attach them to this BFD, provided it is the right
813 format. FIXME: If there are no input BFD's of the same
814 format as the output, we can't make a shared library. */
816 && ! elf_hash_table (info
)->dynamic_sections_created
817 && abfd
->xvec
== info
->hash
->creator
)
819 if (! elf_link_create_dynamic_sections (abfd
, info
))
828 bfd_size_type oldsize
;
829 bfd_size_type strindex
;
831 /* Find the name to use in a DT_NEEDED entry that refers to this
832 object. If the object has a DT_SONAME entry, we use it.
833 Otherwise, if the generic linker stuck something in
834 elf_dt_name, we use that. Otherwise, we just use the file
835 name. If the generic linker put a null string into
836 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
837 there is a DT_SONAME entry. */
839 name
= bfd_get_filename (abfd
);
840 if (elf_dt_name (abfd
) != NULL
)
842 name
= elf_dt_name (abfd
);
846 s
= bfd_get_section_by_name (abfd
, ".dynamic");
849 Elf_External_Dyn
*extdyn
;
850 Elf_External_Dyn
*extdynend
;
854 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
858 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
859 (file_ptr
) 0, s
->_raw_size
))
862 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
865 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
868 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
869 for (; extdyn
< extdynend
; extdyn
++)
871 Elf_Internal_Dyn dyn
;
873 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
874 if (dyn
.d_tag
== DT_SONAME
)
876 name
= bfd_elf_string_from_elf_section (abfd
, link
,
881 if (dyn
.d_tag
== DT_NEEDED
)
883 struct bfd_link_needed_list
*n
, **pn
;
886 n
= ((struct bfd_link_needed_list
*)
887 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
888 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
890 if (n
== NULL
|| fnm
== NULL
)
892 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
899 for (pn
= &elf_hash_table (info
)->needed
;
911 /* We do not want to include any of the sections in a dynamic
912 object in the output file. We hack by simply clobbering the
913 list of sections in the BFD. This could be handled more
914 cleanly by, say, a new section flag; the existing
915 SEC_NEVER_LOAD flag is not the one we want, because that one
916 still implies that the section takes up space in the output
918 abfd
->sections
= NULL
;
919 abfd
->section_count
= 0;
921 /* If this is the first dynamic object found in the link, create
922 the special sections required for dynamic linking. */
923 if (! elf_hash_table (info
)->dynamic_sections_created
)
925 if (! elf_link_create_dynamic_sections (abfd
, info
))
931 /* Add a DT_NEEDED entry for this dynamic object. */
932 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
933 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
935 if (strindex
== (bfd_size_type
) -1)
938 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
941 Elf_External_Dyn
*dyncon
, *dynconend
;
943 /* The hash table size did not change, which means that
944 the dynamic object name was already entered. If we
945 have already included this dynamic object in the
946 link, just ignore it. There is no reason to include
947 a particular dynamic object more than once. */
948 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
950 BFD_ASSERT (sdyn
!= NULL
);
952 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
953 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
955 for (; dyncon
< dynconend
; dyncon
++)
957 Elf_Internal_Dyn dyn
;
959 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
961 if (dyn
.d_tag
== DT_NEEDED
962 && dyn
.d_un
.d_val
== strindex
)
966 if (extversym
!= NULL
)
973 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
977 /* Save the SONAME, if there is one, because sometimes the
978 linker emulation code will need to know it. */
980 name
= bfd_get_filename (abfd
);
981 elf_dt_name (abfd
) = name
;
985 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
987 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
988 != extsymcount
* sizeof (Elf_External_Sym
)))
993 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
994 esymend
= buf
+ extsymcount
;
997 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
999 Elf_Internal_Sym sym
;
1005 struct elf_link_hash_entry
*h
;
1007 boolean size_change_ok
, type_change_ok
;
1008 boolean new_weakdef
;
1009 unsigned int old_alignment
;
1011 elf_swap_symbol_in (abfd
, esym
, &sym
);
1013 flags
= BSF_NO_FLAGS
;
1015 value
= sym
.st_value
;
1018 bind
= ELF_ST_BIND (sym
.st_info
);
1019 if (bind
== STB_LOCAL
)
1021 /* This should be impossible, since ELF requires that all
1022 global symbols follow all local symbols, and that sh_info
1023 point to the first global symbol. Unfortunatealy, Irix 5
1027 else if (bind
== STB_GLOBAL
)
1029 if (sym
.st_shndx
!= SHN_UNDEF
1030 && sym
.st_shndx
!= SHN_COMMON
)
1035 else if (bind
== STB_WEAK
)
1039 /* Leave it up to the processor backend. */
1042 if (sym
.st_shndx
== SHN_UNDEF
)
1043 sec
= bfd_und_section_ptr
;
1044 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1046 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1048 sec
= bfd_abs_section_ptr
;
1049 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1052 else if (sym
.st_shndx
== SHN_ABS
)
1053 sec
= bfd_abs_section_ptr
;
1054 else if (sym
.st_shndx
== SHN_COMMON
)
1056 sec
= bfd_com_section_ptr
;
1057 /* What ELF calls the size we call the value. What ELF
1058 calls the value we call the alignment. */
1059 value
= sym
.st_size
;
1063 /* Leave it up to the processor backend. */
1066 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1067 if (name
== (const char *) NULL
)
1070 if (add_symbol_hook
)
1072 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1076 /* The hook function sets the name to NULL if this symbol
1077 should be skipped for some reason. */
1078 if (name
== (const char *) NULL
)
1082 /* Sanity check that all possibilities were handled. */
1083 if (sec
== (asection
*) NULL
)
1085 bfd_set_error (bfd_error_bad_value
);
1089 if (bfd_is_und_section (sec
)
1090 || bfd_is_com_section (sec
))
1095 size_change_ok
= false;
1096 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1098 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1100 Elf_Internal_Versym iver
;
1101 unsigned int vernum
= 0;
1106 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1107 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1109 /* If this is a hidden symbol, or if it is not version
1110 1, we append the version name to the symbol name.
1111 However, we do not modify a non-hidden absolute
1112 symbol, because it might be the version symbol
1113 itself. FIXME: What if it isn't? */
1114 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1115 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1118 int namelen
, newlen
;
1121 if (sym
.st_shndx
!= SHN_UNDEF
)
1123 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1125 (*_bfd_error_handler
)
1126 (_("%s: %s: invalid version %u (max %d)"),
1127 abfd
->filename
, name
, vernum
,
1128 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1129 bfd_set_error (bfd_error_bad_value
);
1132 else if (vernum
> 1)
1134 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1140 /* We cannot simply test for the number of
1141 entries in the VERNEED section since the
1142 numbers for the needed versions do not start
1144 Elf_Internal_Verneed
*t
;
1147 for (t
= elf_tdata (abfd
)->verref
;
1151 Elf_Internal_Vernaux
*a
;
1153 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1155 if (a
->vna_other
== vernum
)
1157 verstr
= a
->vna_nodename
;
1166 (*_bfd_error_handler
)
1167 (_("%s: %s: invalid needed version %d"),
1168 abfd
->filename
, name
, vernum
);
1169 bfd_set_error (bfd_error_bad_value
);
1174 namelen
= strlen (name
);
1175 newlen
= namelen
+ strlen (verstr
) + 2;
1176 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1179 newname
= (char *) bfd_alloc (abfd
, newlen
);
1180 if (newname
== NULL
)
1182 strcpy (newname
, name
);
1183 p
= newname
+ namelen
;
1185 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1193 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1194 sym_hash
, &override
, &type_change_ok
,
1202 while (h
->root
.type
== bfd_link_hash_indirect
1203 || h
->root
.type
== bfd_link_hash_warning
)
1204 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1206 /* Remember the old alignment if this is a common symbol, so
1207 that we don't reduce the alignment later on. We can't
1208 check later, because _bfd_generic_link_add_one_symbol
1209 will set a default for the alignment which we want to
1211 if (h
->root
.type
== bfd_link_hash_common
)
1212 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1214 if (elf_tdata (abfd
)->verdef
!= NULL
1218 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1221 if (! (_bfd_generic_link_add_one_symbol
1222 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1223 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1227 while (h
->root
.type
== bfd_link_hash_indirect
1228 || h
->root
.type
== bfd_link_hash_warning
)
1229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1232 new_weakdef
= false;
1235 && (flags
& BSF_WEAK
) != 0
1236 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1237 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1238 && h
->weakdef
== NULL
)
1240 /* Keep a list of all weak defined non function symbols from
1241 a dynamic object, using the weakdef field. Later in this
1242 function we will set the weakdef field to the correct
1243 value. We only put non-function symbols from dynamic
1244 objects on this list, because that happens to be the only
1245 time we need to know the normal symbol corresponding to a
1246 weak symbol, and the information is time consuming to
1247 figure out. If the weakdef field is not already NULL,
1248 then this symbol was already defined by some previous
1249 dynamic object, and we will be using that previous
1250 definition anyhow. */
1257 /* Set the alignment of a common symbol. */
1258 if (sym
.st_shndx
== SHN_COMMON
1259 && h
->root
.type
== bfd_link_hash_common
)
1263 align
= bfd_log2 (sym
.st_value
);
1264 if (align
> old_alignment
)
1265 h
->root
.u
.c
.p
->alignment_power
= align
;
1268 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1274 /* Remember the symbol size and type. */
1275 if (sym
.st_size
!= 0
1276 && (definition
|| h
->size
== 0))
1278 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1279 (*_bfd_error_handler
)
1280 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1281 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1282 bfd_get_filename (abfd
));
1284 h
->size
= sym
.st_size
;
1287 /* If this is a common symbol, then we always want H->SIZE
1288 to be the size of the common symbol. The code just above
1289 won't fix the size if a common symbol becomes larger. We
1290 don't warn about a size change here, because that is
1291 covered by --warn-common. */
1292 if (h
->root
.type
== bfd_link_hash_common
)
1293 h
->size
= h
->root
.u
.c
.size
;
1295 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1296 && (definition
|| h
->type
== STT_NOTYPE
))
1298 if (h
->type
!= STT_NOTYPE
1299 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1300 && ! type_change_ok
)
1301 (*_bfd_error_handler
)
1302 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1303 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1304 bfd_get_filename (abfd
));
1306 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1309 if (sym
.st_other
!= 0
1310 && (definition
|| h
->other
== 0))
1311 h
->other
= sym
.st_other
;
1313 /* Set a flag in the hash table entry indicating the type of
1314 reference or definition we just found. Keep a count of
1315 the number of dynamic symbols we find. A dynamic symbol
1316 is one which is referenced or defined by both a regular
1317 object and a shared object. */
1318 old_flags
= h
->elf_link_hash_flags
;
1323 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1325 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1327 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1328 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1334 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1336 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1337 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1338 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1339 || (h
->weakdef
!= NULL
1341 && h
->weakdef
->dynindx
!= -1))
1345 h
->elf_link_hash_flags
|= new_flag
;
1347 /* If this symbol has a version, and it is the default
1348 version, we create an indirect symbol from the default
1349 name to the fully decorated name. This will cause
1350 external references which do not specify a version to be
1351 bound to this version of the symbol. */
1356 p
= strchr (name
, ELF_VER_CHR
);
1357 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1360 struct elf_link_hash_entry
*hi
;
1363 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1365 if (shortname
== NULL
)
1367 strncpy (shortname
, name
, p
- name
);
1368 shortname
[p
- name
] = '\0';
1370 /* We are going to create a new symbol. Merge it
1371 with any existing symbol with this name. For the
1372 purposes of the merge, act as though we were
1373 defining the symbol we just defined, although we
1374 actually going to define an indirect symbol. */
1375 type_change_ok
= false;
1376 size_change_ok
= false;
1377 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1378 &value
, &hi
, &override
,
1379 &type_change_ok
, &size_change_ok
))
1384 if (! (_bfd_generic_link_add_one_symbol
1385 (info
, abfd
, shortname
, BSF_INDIRECT
,
1386 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1387 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1392 /* In this case the symbol named SHORTNAME is
1393 overriding the indirect symbol we want to
1394 add. We were planning on making SHORTNAME an
1395 indirect symbol referring to NAME. SHORTNAME
1396 is the name without a version. NAME is the
1397 fully versioned name, and it is the default
1400 Overriding means that we already saw a
1401 definition for the symbol SHORTNAME in a
1402 regular object, and it is overriding the
1403 symbol defined in the dynamic object.
1405 When this happens, we actually want to change
1406 NAME, the symbol we just added, to refer to
1407 SHORTNAME. This will cause references to
1408 NAME in the shared object to become
1409 references to SHORTNAME in the regular
1410 object. This is what we expect when we
1411 override a function in a shared object: that
1412 the references in the shared object will be
1413 mapped to the definition in the regular
1416 while (hi
->root
.type
== bfd_link_hash_indirect
1417 || hi
->root
.type
== bfd_link_hash_warning
)
1418 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1420 h
->root
.type
= bfd_link_hash_indirect
;
1421 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1422 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1424 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1425 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1427 /* Don't record the unversioned alias. This
1428 produces bogus ABS symbols on export as
1429 they never get defined peroperly. */
1430 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1435 /* Now set HI to H, so that the following code
1436 will set the other fields correctly. */
1440 /* If there is a duplicate definition somewhere,
1441 then HI may not point to an indirect symbol. We
1442 will have reported an error to the user in that
1445 if (hi
->root
.type
== bfd_link_hash_indirect
)
1447 struct elf_link_hash_entry
*ht
;
1449 /* If the symbol became indirect, then we assume
1450 that we have not seen a definition before. */
1451 BFD_ASSERT ((hi
->elf_link_hash_flags
1452 & (ELF_LINK_HASH_DEF_DYNAMIC
1453 | ELF_LINK_HASH_DEF_REGULAR
))
1456 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1458 /* Copy down any references that we may have
1459 already seen to the symbol which just became
1461 ht
->elf_link_hash_flags
|=
1462 (hi
->elf_link_hash_flags
1463 & (ELF_LINK_HASH_REF_DYNAMIC
1464 | ELF_LINK_HASH_REF_REGULAR
));
1466 /* Copy over the global and procedure linkage table
1467 offset entries. These may have been already set
1468 up by a check_relocs routine. */
1469 if (ht
->got
.offset
== (bfd_vma
) -1)
1471 ht
->got
.offset
= hi
->got
.offset
;
1472 hi
->got
.offset
= (bfd_vma
) -1;
1474 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1476 if (ht
->plt
.offset
== (bfd_vma
) -1)
1478 ht
->plt
.offset
= hi
->plt
.offset
;
1479 hi
->plt
.offset
= (bfd_vma
) -1;
1481 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1483 if (ht
->dynindx
== -1)
1485 ht
->dynindx
= hi
->dynindx
;
1486 ht
->dynstr_index
= hi
->dynstr_index
;
1488 hi
->dynstr_index
= 0;
1490 BFD_ASSERT (hi
->dynindx
== -1);
1492 /* FIXME: There may be other information to copy
1493 over for particular targets. */
1495 /* See if the new flags lead us to realize that
1496 the symbol must be dynamic. */
1502 || ((hi
->elf_link_hash_flags
1503 & ELF_LINK_HASH_REF_DYNAMIC
)
1509 if ((hi
->elf_link_hash_flags
1510 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1516 /* We also need to define an indirection from the
1517 nondefault version of the symbol. */
1519 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1521 if (shortname
== NULL
)
1523 strncpy (shortname
, name
, p
- name
);
1524 strcpy (shortname
+ (p
- name
), p
+ 1);
1526 /* Once again, merge with any existing symbol. */
1527 type_change_ok
= false;
1528 size_change_ok
= false;
1529 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1530 &value
, &hi
, &override
,
1531 &type_change_ok
, &size_change_ok
))
1536 /* Here SHORTNAME is a versioned name, so we
1537 don't expect to see the type of override we
1538 do in the case above. */
1539 (*_bfd_error_handler
)
1540 (_("%s: warning: unexpected redefinition of `%s'"),
1541 bfd_get_filename (abfd
), shortname
);
1545 if (! (_bfd_generic_link_add_one_symbol
1546 (info
, abfd
, shortname
, BSF_INDIRECT
,
1547 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1548 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1551 /* If there is a duplicate definition somewhere,
1552 then HI may not point to an indirect symbol.
1553 We will have reported an error to the user in
1556 if (hi
->root
.type
== bfd_link_hash_indirect
)
1558 /* If the symbol became indirect, then we
1559 assume that we have not seen a definition
1561 BFD_ASSERT ((hi
->elf_link_hash_flags
1562 & (ELF_LINK_HASH_DEF_DYNAMIC
1563 | ELF_LINK_HASH_DEF_REGULAR
))
1566 /* Copy down any references that we may have
1567 already seen to the symbol which just
1569 h
->elf_link_hash_flags
|=
1570 (hi
->elf_link_hash_flags
1571 & (ELF_LINK_HASH_REF_DYNAMIC
1572 | ELF_LINK_HASH_REF_REGULAR
));
1574 /* Copy over the global and procedure linkage
1575 table offset entries. These may have been
1576 already set up by a check_relocs routine. */
1577 if (h
->got
.offset
== (bfd_vma
) -1)
1579 h
->got
.offset
= hi
->got
.offset
;
1580 hi
->got
.offset
= (bfd_vma
) -1;
1582 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1584 if (h
->plt
.offset
== (bfd_vma
) -1)
1586 h
->plt
.offset
= hi
->plt
.offset
;
1587 hi
->plt
.offset
= (bfd_vma
) -1;
1589 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1591 if (h
->dynindx
== -1)
1593 h
->dynindx
= hi
->dynindx
;
1594 h
->dynstr_index
= hi
->dynstr_index
;
1596 hi
->dynstr_index
= 0;
1598 BFD_ASSERT (hi
->dynindx
== -1);
1600 /* FIXME: There may be other information to
1601 copy over for particular targets. */
1603 /* See if the new flags lead us to realize
1604 that the symbol must be dynamic. */
1610 || ((hi
->elf_link_hash_flags
1611 & ELF_LINK_HASH_REF_DYNAMIC
)
1617 if ((hi
->elf_link_hash_flags
1618 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1627 if (dynsym
&& h
->dynindx
== -1)
1629 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1631 if (h
->weakdef
!= NULL
1633 && h
->weakdef
->dynindx
== -1)
1635 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1643 /* Now set the weakdefs field correctly for all the weak defined
1644 symbols we found. The only way to do this is to search all the
1645 symbols. Since we only need the information for non functions in
1646 dynamic objects, that's the only time we actually put anything on
1647 the list WEAKS. We need this information so that if a regular
1648 object refers to a symbol defined weakly in a dynamic object, the
1649 real symbol in the dynamic object is also put in the dynamic
1650 symbols; we also must arrange for both symbols to point to the
1651 same memory location. We could handle the general case of symbol
1652 aliasing, but a general symbol alias can only be generated in
1653 assembler code, handling it correctly would be very time
1654 consuming, and other ELF linkers don't handle general aliasing
1656 while (weaks
!= NULL
)
1658 struct elf_link_hash_entry
*hlook
;
1661 struct elf_link_hash_entry
**hpp
;
1662 struct elf_link_hash_entry
**hppend
;
1665 weaks
= hlook
->weakdef
;
1666 hlook
->weakdef
= NULL
;
1668 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1669 || hlook
->root
.type
== bfd_link_hash_defweak
1670 || hlook
->root
.type
== bfd_link_hash_common
1671 || hlook
->root
.type
== bfd_link_hash_indirect
);
1672 slook
= hlook
->root
.u
.def
.section
;
1673 vlook
= hlook
->root
.u
.def
.value
;
1675 hpp
= elf_sym_hashes (abfd
);
1676 hppend
= hpp
+ extsymcount
;
1677 for (; hpp
< hppend
; hpp
++)
1679 struct elf_link_hash_entry
*h
;
1682 if (h
!= NULL
&& h
!= hlook
1683 && h
->root
.type
== bfd_link_hash_defined
1684 && h
->root
.u
.def
.section
== slook
1685 && h
->root
.u
.def
.value
== vlook
)
1689 /* If the weak definition is in the list of dynamic
1690 symbols, make sure the real definition is put there
1692 if (hlook
->dynindx
!= -1
1693 && h
->dynindx
== -1)
1695 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1699 /* If the real definition is in the list of dynamic
1700 symbols, make sure the weak definition is put there
1701 as well. If we don't do this, then the dynamic
1702 loader might not merge the entries for the real
1703 definition and the weak definition. */
1704 if (h
->dynindx
!= -1
1705 && hlook
->dynindx
== -1)
1707 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1722 if (extversym
!= NULL
)
1728 /* If this object is the same format as the output object, and it is
1729 not a shared library, then let the backend look through the
1732 This is required to build global offset table entries and to
1733 arrange for dynamic relocs. It is not required for the
1734 particular common case of linking non PIC code, even when linking
1735 against shared libraries, but unfortunately there is no way of
1736 knowing whether an object file has been compiled PIC or not.
1737 Looking through the relocs is not particularly time consuming.
1738 The problem is that we must either (1) keep the relocs in memory,
1739 which causes the linker to require additional runtime memory or
1740 (2) read the relocs twice from the input file, which wastes time.
1741 This would be a good case for using mmap.
1743 I have no idea how to handle linking PIC code into a file of a
1744 different format. It probably can't be done. */
1745 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1747 && abfd
->xvec
== info
->hash
->creator
1748 && check_relocs
!= NULL
)
1752 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1754 Elf_Internal_Rela
*internal_relocs
;
1757 if ((o
->flags
& SEC_RELOC
) == 0
1758 || o
->reloc_count
== 0
1759 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1760 && (o
->flags
& SEC_DEBUGGING
) != 0)
1761 || bfd_is_abs_section (o
->output_section
))
1764 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1765 (abfd
, o
, (PTR
) NULL
,
1766 (Elf_Internal_Rela
*) NULL
,
1767 info
->keep_memory
));
1768 if (internal_relocs
== NULL
)
1771 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1773 if (! info
->keep_memory
)
1774 free (internal_relocs
);
1781 /* If this is a non-traditional, non-relocateable link, try to
1782 optimize the handling of the .stab/.stabstr sections. */
1784 && ! info
->relocateable
1785 && ! info
->traditional_format
1786 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1787 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1789 asection
*stab
, *stabstr
;
1791 stab
= bfd_get_section_by_name (abfd
, ".stab");
1794 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1796 if (stabstr
!= NULL
)
1798 struct bfd_elf_section_data
*secdata
;
1800 secdata
= elf_section_data (stab
);
1801 if (! _bfd_link_section_stabs (abfd
,
1802 &elf_hash_table (info
)->stab_info
,
1804 &secdata
->stab_info
))
1819 if (extversym
!= NULL
)
1824 /* Create some sections which will be filled in with dynamic linking
1825 information. ABFD is an input file which requires dynamic sections
1826 to be created. The dynamic sections take up virtual memory space
1827 when the final executable is run, so we need to create them before
1828 addresses are assigned to the output sections. We work out the
1829 actual contents and size of these sections later. */
1832 elf_link_create_dynamic_sections (abfd
, info
)
1834 struct bfd_link_info
*info
;
1837 register asection
*s
;
1838 struct elf_link_hash_entry
*h
;
1839 struct elf_backend_data
*bed
;
1841 if (elf_hash_table (info
)->dynamic_sections_created
)
1844 /* Make sure that all dynamic sections use the same input BFD. */
1845 if (elf_hash_table (info
)->dynobj
== NULL
)
1846 elf_hash_table (info
)->dynobj
= abfd
;
1848 abfd
= elf_hash_table (info
)->dynobj
;
1850 /* Note that we set the SEC_IN_MEMORY flag for all of these
1852 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1853 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1855 /* A dynamically linked executable has a .interp section, but a
1856 shared library does not. */
1859 s
= bfd_make_section (abfd
, ".interp");
1861 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1865 /* Create sections to hold version informations. These are removed
1866 if they are not needed. */
1867 s
= bfd_make_section (abfd
, ".gnu.version_d");
1869 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1870 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1873 s
= bfd_make_section (abfd
, ".gnu.version");
1875 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1876 || ! bfd_set_section_alignment (abfd
, s
, 1))
1879 s
= bfd_make_section (abfd
, ".gnu.version_r");
1881 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1882 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1885 s
= bfd_make_section (abfd
, ".dynsym");
1887 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1888 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1891 s
= bfd_make_section (abfd
, ".dynstr");
1893 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1896 /* Create a strtab to hold the dynamic symbol names. */
1897 if (elf_hash_table (info
)->dynstr
== NULL
)
1899 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1900 if (elf_hash_table (info
)->dynstr
== NULL
)
1904 s
= bfd_make_section (abfd
, ".dynamic");
1906 || ! bfd_set_section_flags (abfd
, s
, flags
)
1907 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1910 /* The special symbol _DYNAMIC is always set to the start of the
1911 .dynamic section. This call occurs before we have processed the
1912 symbols for any dynamic object, so we don't have to worry about
1913 overriding a dynamic definition. We could set _DYNAMIC in a
1914 linker script, but we only want to define it if we are, in fact,
1915 creating a .dynamic section. We don't want to define it if there
1916 is no .dynamic section, since on some ELF platforms the start up
1917 code examines it to decide how to initialize the process. */
1919 if (! (_bfd_generic_link_add_one_symbol
1920 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1921 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1922 (struct bfd_link_hash_entry
**) &h
)))
1924 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1925 h
->type
= STT_OBJECT
;
1928 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1931 s
= bfd_make_section (abfd
, ".hash");
1933 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1934 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1937 /* Let the backend create the rest of the sections. This lets the
1938 backend set the right flags. The backend will normally create
1939 the .got and .plt sections. */
1940 bed
= get_elf_backend_data (abfd
);
1941 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1944 elf_hash_table (info
)->dynamic_sections_created
= true;
1949 /* Add an entry to the .dynamic table. */
1952 elf_add_dynamic_entry (info
, tag
, val
)
1953 struct bfd_link_info
*info
;
1957 Elf_Internal_Dyn dyn
;
1961 bfd_byte
*newcontents
;
1963 dynobj
= elf_hash_table (info
)->dynobj
;
1965 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1966 BFD_ASSERT (s
!= NULL
);
1968 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1969 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1970 if (newcontents
== NULL
)
1974 dyn
.d_un
.d_val
= val
;
1975 elf_swap_dyn_out (dynobj
, &dyn
,
1976 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1978 s
->_raw_size
= newsize
;
1979 s
->contents
= newcontents
;
1985 /* Read and swap the relocs for a section. They may have been cached.
1986 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1987 they are used as buffers to read into. They are known to be large
1988 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1989 value is allocated using either malloc or bfd_alloc, according to
1990 the KEEP_MEMORY argument. */
1993 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1997 PTR external_relocs
;
1998 Elf_Internal_Rela
*internal_relocs
;
1999 boolean keep_memory
;
2001 Elf_Internal_Shdr
*rel_hdr
;
2003 Elf_Internal_Rela
*alloc2
= NULL
;
2005 if (elf_section_data (o
)->relocs
!= NULL
)
2006 return elf_section_data (o
)->relocs
;
2008 if (o
->reloc_count
== 0)
2011 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2013 if (internal_relocs
== NULL
)
2017 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2019 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2021 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2022 if (internal_relocs
== NULL
)
2026 if (external_relocs
== NULL
)
2028 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2031 external_relocs
= alloc1
;
2034 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2035 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2036 != rel_hdr
->sh_size
))
2039 /* Swap in the relocs. For convenience, we always produce an
2040 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2042 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2044 Elf_External_Rel
*erel
;
2045 Elf_External_Rel
*erelend
;
2046 Elf_Internal_Rela
*irela
;
2048 erel
= (Elf_External_Rel
*) external_relocs
;
2049 erelend
= erel
+ o
->reloc_count
;
2050 irela
= internal_relocs
;
2051 for (; erel
< erelend
; erel
++, irela
++)
2053 Elf_Internal_Rel irel
;
2055 elf_swap_reloc_in (abfd
, erel
, &irel
);
2056 irela
->r_offset
= irel
.r_offset
;
2057 irela
->r_info
= irel
.r_info
;
2058 irela
->r_addend
= 0;
2063 Elf_External_Rela
*erela
;
2064 Elf_External_Rela
*erelaend
;
2065 Elf_Internal_Rela
*irela
;
2067 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2069 erela
= (Elf_External_Rela
*) external_relocs
;
2070 erelaend
= erela
+ o
->reloc_count
;
2071 irela
= internal_relocs
;
2072 for (; erela
< erelaend
; erela
++, irela
++)
2073 elf_swap_reloca_in (abfd
, erela
, irela
);
2076 /* Cache the results for next time, if we can. */
2078 elf_section_data (o
)->relocs
= internal_relocs
;
2083 /* Don't free alloc2, since if it was allocated we are passing it
2084 back (under the name of internal_relocs). */
2086 return internal_relocs
;
2097 /* Record an assignment to a symbol made by a linker script. We need
2098 this in case some dynamic object refers to this symbol. */
2102 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2104 struct bfd_link_info
*info
;
2108 struct elf_link_hash_entry
*h
;
2110 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2113 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2117 if (h
->root
.type
== bfd_link_hash_new
)
2118 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2120 /* If this symbol is being provided by the linker script, and it is
2121 currently defined by a dynamic object, but not by a regular
2122 object, then mark it as undefined so that the generic linker will
2123 force the correct value. */
2125 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2126 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2127 h
->root
.type
= bfd_link_hash_undefined
;
2129 /* If this symbol is not being provided by the linker script, and it is
2130 currently defined by a dynamic object, but not by a regular object,
2131 then clear out any version information because the symbol will not be
2132 associated with the dynamic object any more. */
2134 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2135 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2136 h
->verinfo
.verdef
= NULL
;
2138 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2139 h
->type
= STT_OBJECT
;
2141 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2142 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2144 && h
->dynindx
== -1)
2146 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2149 /* If this is a weak defined symbol, and we know a corresponding
2150 real symbol from the same dynamic object, make sure the real
2151 symbol is also made into a dynamic symbol. */
2152 if (h
->weakdef
!= NULL
2153 && h
->weakdef
->dynindx
== -1)
2155 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2163 /* This structure is used to pass information to
2164 elf_link_assign_sym_version. */
2166 struct elf_assign_sym_version_info
2170 /* General link information. */
2171 struct bfd_link_info
*info
;
2173 struct bfd_elf_version_tree
*verdefs
;
2174 /* Whether we are exporting all dynamic symbols. */
2175 boolean export_dynamic
;
2176 /* Whether we removed any symbols from the dynamic symbol table. */
2177 boolean removed_dynamic
;
2178 /* Whether we had a failure. */
2182 /* This structure is used to pass information to
2183 elf_link_find_version_dependencies. */
2185 struct elf_find_verdep_info
2189 /* General link information. */
2190 struct bfd_link_info
*info
;
2191 /* The number of dependencies. */
2193 /* Whether we had a failure. */
2197 /* Array used to determine the number of hash table buckets to use
2198 based on the number of symbols there are. If there are fewer than
2199 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2200 fewer than 37 we use 17 buckets, and so forth. We never use more
2201 than 32771 buckets. */
2203 static const size_t elf_buckets
[] =
2205 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2209 /* Set up the sizes and contents of the ELF dynamic sections. This is
2210 called by the ELF linker emulation before_allocation routine. We
2211 must set the sizes of the sections before the linker sets the
2212 addresses of the various sections. */
2215 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2216 export_dynamic
, filter_shlib
,
2217 auxiliary_filters
, info
, sinterpptr
,
2222 boolean export_dynamic
;
2223 const char *filter_shlib
;
2224 const char * const *auxiliary_filters
;
2225 struct bfd_link_info
*info
;
2226 asection
**sinterpptr
;
2227 struct bfd_elf_version_tree
*verdefs
;
2229 bfd_size_type soname_indx
;
2231 struct elf_backend_data
*bed
;
2232 bfd_size_type old_dynsymcount
;
2233 struct elf_assign_sym_version_info asvinfo
;
2237 soname_indx
= (bfd_size_type
) -1;
2239 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2242 /* The backend may have to create some sections regardless of whether
2243 we're dynamic or not. */
2244 bed
= get_elf_backend_data (output_bfd
);
2245 if (bed
->elf_backend_always_size_sections
2246 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2249 dynobj
= elf_hash_table (info
)->dynobj
;
2251 /* If there were no dynamic objects in the link, there is nothing to
2256 /* If we are supposed to export all symbols into the dynamic symbol
2257 table (this is not the normal case), then do so. */
2260 struct elf_info_failed eif
;
2264 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2270 if (elf_hash_table (info
)->dynamic_sections_created
)
2272 struct elf_info_failed eif
;
2273 struct elf_link_hash_entry
*h
;
2274 bfd_size_type strsize
;
2276 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2277 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2281 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2282 soname
, true, true);
2283 if (soname_indx
== (bfd_size_type
) -1
2284 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2290 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2298 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2300 if (indx
== (bfd_size_type
) -1
2301 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2305 if (filter_shlib
!= NULL
)
2309 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2310 filter_shlib
, true, true);
2311 if (indx
== (bfd_size_type
) -1
2312 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2316 if (auxiliary_filters
!= NULL
)
2318 const char * const *p
;
2320 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2324 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2326 if (indx
== (bfd_size_type
) -1
2327 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2332 /* Attach all the symbols to their version information. */
2333 asvinfo
.output_bfd
= output_bfd
;
2334 asvinfo
.info
= info
;
2335 asvinfo
.verdefs
= verdefs
;
2336 asvinfo
.export_dynamic
= export_dynamic
;
2337 asvinfo
.removed_dynamic
= false;
2338 asvinfo
.failed
= false;
2340 elf_link_hash_traverse (elf_hash_table (info
),
2341 elf_link_assign_sym_version
,
2346 /* Find all symbols which were defined in a dynamic object and make
2347 the backend pick a reasonable value for them. */
2350 elf_link_hash_traverse (elf_hash_table (info
),
2351 elf_adjust_dynamic_symbol
,
2356 /* Add some entries to the .dynamic section. We fill in some of the
2357 values later, in elf_bfd_final_link, but we must add the entries
2358 now so that we know the final size of the .dynamic section. */
2359 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2362 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2363 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2365 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2368 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2371 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2372 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2374 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2377 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2378 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2379 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2380 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2381 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2382 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2383 sizeof (Elf_External_Sym
)))
2387 /* The backend must work out the sizes of all the other dynamic
2389 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2390 if (bed
->elf_backend_size_dynamic_sections
2391 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2394 if (elf_hash_table (info
)->dynamic_sections_created
)
2399 size_t bucketcount
= 0;
2400 Elf_Internal_Sym isym
;
2402 /* Set up the version definition section. */
2403 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2404 BFD_ASSERT (s
!= NULL
);
2406 /* We may have created additional version definitions if we are
2407 just linking a regular application. */
2408 verdefs
= asvinfo
.verdefs
;
2410 if (verdefs
== NULL
)
2414 /* Don't include this section in the output file. */
2415 for (spp
= &output_bfd
->sections
;
2416 *spp
!= s
->output_section
;
2417 spp
= &(*spp
)->next
)
2419 *spp
= s
->output_section
->next
;
2420 --output_bfd
->section_count
;
2426 struct bfd_elf_version_tree
*t
;
2428 Elf_Internal_Verdef def
;
2429 Elf_Internal_Verdaux defaux
;
2431 if (asvinfo
.removed_dynamic
)
2433 /* Some dynamic symbols were changed to be local
2434 symbols. In this case, we renumber all of the
2435 dynamic symbols, so that we don't have a hole. If
2436 the backend changed dynsymcount, then assume that the
2437 new symbols are at the start. This is the case on
2438 the MIPS. FIXME: The names of the removed symbols
2439 will still be in the dynamic string table, wasting
2441 elf_hash_table (info
)->dynsymcount
=
2442 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2443 elf_link_hash_traverse (elf_hash_table (info
),
2444 elf_link_renumber_dynsyms
,
2451 /* Make space for the base version. */
2452 size
+= sizeof (Elf_External_Verdef
);
2453 size
+= sizeof (Elf_External_Verdaux
);
2456 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2458 struct bfd_elf_version_deps
*n
;
2460 size
+= sizeof (Elf_External_Verdef
);
2461 size
+= sizeof (Elf_External_Verdaux
);
2464 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2465 size
+= sizeof (Elf_External_Verdaux
);
2468 s
->_raw_size
= size
;
2469 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2470 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2473 /* Fill in the version definition section. */
2477 def
.vd_version
= VER_DEF_CURRENT
;
2478 def
.vd_flags
= VER_FLG_BASE
;
2481 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2482 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2483 + sizeof (Elf_External_Verdaux
));
2485 if (soname_indx
!= (bfd_size_type
) -1)
2487 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2488 defaux
.vda_name
= soname_indx
;
2495 name
= output_bfd
->filename
;
2496 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2497 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2499 if (indx
== (bfd_size_type
) -1)
2501 defaux
.vda_name
= indx
;
2503 defaux
.vda_next
= 0;
2505 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2506 (Elf_External_Verdef
*)p
);
2507 p
+= sizeof (Elf_External_Verdef
);
2508 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2509 (Elf_External_Verdaux
*) p
);
2510 p
+= sizeof (Elf_External_Verdaux
);
2512 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2515 struct bfd_elf_version_deps
*n
;
2516 struct elf_link_hash_entry
*h
;
2519 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2522 /* Add a symbol representing this version. */
2524 if (! (_bfd_generic_link_add_one_symbol
2525 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2526 (bfd_vma
) 0, (const char *) NULL
, false,
2527 get_elf_backend_data (dynobj
)->collect
,
2528 (struct bfd_link_hash_entry
**) &h
)))
2530 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2531 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2532 h
->type
= STT_OBJECT
;
2533 h
->verinfo
.vertree
= t
;
2535 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2538 def
.vd_version
= VER_DEF_CURRENT
;
2540 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2541 def
.vd_flags
|= VER_FLG_WEAK
;
2542 def
.vd_ndx
= t
->vernum
+ 1;
2543 def
.vd_cnt
= cdeps
+ 1;
2544 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2545 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2546 if (t
->next
!= NULL
)
2547 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2548 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2552 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2553 (Elf_External_Verdef
*) p
);
2554 p
+= sizeof (Elf_External_Verdef
);
2556 defaux
.vda_name
= h
->dynstr_index
;
2557 if (t
->deps
== NULL
)
2558 defaux
.vda_next
= 0;
2560 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2561 t
->name_indx
= defaux
.vda_name
;
2563 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2564 (Elf_External_Verdaux
*) p
);
2565 p
+= sizeof (Elf_External_Verdaux
);
2567 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2569 if (n
->version_needed
== NULL
)
2571 /* This can happen if there was an error in the
2573 defaux
.vda_name
= 0;
2576 defaux
.vda_name
= n
->version_needed
->name_indx
;
2577 if (n
->next
== NULL
)
2578 defaux
.vda_next
= 0;
2580 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2582 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2583 (Elf_External_Verdaux
*) p
);
2584 p
+= sizeof (Elf_External_Verdaux
);
2588 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2589 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2592 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2595 /* Work out the size of the version reference section. */
2597 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2598 BFD_ASSERT (s
!= NULL
);
2600 struct elf_find_verdep_info sinfo
;
2602 sinfo
.output_bfd
= output_bfd
;
2604 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2605 if (sinfo
.vers
== 0)
2607 sinfo
.failed
= false;
2609 elf_link_hash_traverse (elf_hash_table (info
),
2610 elf_link_find_version_dependencies
,
2613 if (elf_tdata (output_bfd
)->verref
== NULL
)
2617 /* We don't have any version definitions, so we can just
2618 remove the section. */
2620 for (spp
= &output_bfd
->sections
;
2621 *spp
!= s
->output_section
;
2622 spp
= &(*spp
)->next
)
2624 *spp
= s
->output_section
->next
;
2625 --output_bfd
->section_count
;
2629 Elf_Internal_Verneed
*t
;
2634 /* Build the version definition section. */
2637 for (t
= elf_tdata (output_bfd
)->verref
;
2641 Elf_Internal_Vernaux
*a
;
2643 size
+= sizeof (Elf_External_Verneed
);
2645 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2646 size
+= sizeof (Elf_External_Vernaux
);
2649 s
->_raw_size
= size
;
2650 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2651 if (s
->contents
== NULL
)
2655 for (t
= elf_tdata (output_bfd
)->verref
;
2660 Elf_Internal_Vernaux
*a
;
2664 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2667 t
->vn_version
= VER_NEED_CURRENT
;
2669 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2670 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2671 elf_dt_name (t
->vn_bfd
),
2674 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2675 t
->vn_bfd
->filename
, true, false);
2676 if (indx
== (bfd_size_type
) -1)
2679 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2680 if (t
->vn_nextref
== NULL
)
2683 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2684 + caux
* sizeof (Elf_External_Vernaux
));
2686 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2687 (Elf_External_Verneed
*) p
);
2688 p
+= sizeof (Elf_External_Verneed
);
2690 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2692 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2694 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2695 a
->vna_nodename
, true, false);
2696 if (indx
== (bfd_size_type
) -1)
2699 if (a
->vna_nextptr
== NULL
)
2702 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2704 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2705 (Elf_External_Vernaux
*) p
);
2706 p
+= sizeof (Elf_External_Vernaux
);
2710 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2711 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2714 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2718 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2720 /* Work out the size of the symbol version section. */
2721 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2722 BFD_ASSERT (s
!= NULL
);
2723 if (dynsymcount
== 0
2724 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2728 /* We don't need any symbol versions; just discard the
2730 for (spp
= &output_bfd
->sections
;
2731 *spp
!= s
->output_section
;
2732 spp
= &(*spp
)->next
)
2734 *spp
= s
->output_section
->next
;
2735 --output_bfd
->section_count
;
2739 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2740 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2741 if (s
->contents
== NULL
)
2744 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2748 /* Set the size of the .dynsym and .hash sections. We counted
2749 the number of dynamic symbols in elf_link_add_object_symbols.
2750 We will build the contents of .dynsym and .hash when we build
2751 the final symbol table, because until then we do not know the
2752 correct value to give the symbols. We built the .dynstr
2753 section as we went along in elf_link_add_object_symbols. */
2754 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2755 BFD_ASSERT (s
!= NULL
);
2756 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2757 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2758 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2761 /* The first entry in .dynsym is a dummy symbol. */
2768 elf_swap_symbol_out (output_bfd
, &isym
,
2769 (PTR
) (Elf_External_Sym
*) s
->contents
);
2771 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2773 bucketcount
= elf_buckets
[i
];
2774 if (dynsymcount
< elf_buckets
[i
+ 1])
2778 s
= bfd_get_section_by_name (dynobj
, ".hash");
2779 BFD_ASSERT (s
!= NULL
);
2780 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2781 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2782 if (s
->contents
== NULL
)
2784 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2786 put_word (output_bfd
, bucketcount
, s
->contents
);
2787 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2789 elf_hash_table (info
)->bucketcount
= bucketcount
;
2791 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2792 BFD_ASSERT (s
!= NULL
);
2793 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2795 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2802 /* Fix up the flags for a symbol. This handles various cases which
2803 can only be fixed after all the input files are seen. This is
2804 currently called by both adjust_dynamic_symbol and
2805 assign_sym_version, which is unnecessary but perhaps more robust in
2806 the face of future changes. */
2809 elf_fix_symbol_flags (h
, eif
)
2810 struct elf_link_hash_entry
*h
;
2811 struct elf_info_failed
*eif
;
2813 /* If this symbol was mentioned in a non-ELF file, try to set
2814 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2815 permit a non-ELF file to correctly refer to a symbol defined in
2816 an ELF dynamic object. */
2817 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2819 if (h
->root
.type
!= bfd_link_hash_defined
2820 && h
->root
.type
!= bfd_link_hash_defweak
)
2821 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2824 if (h
->root
.u
.def
.section
->owner
!= NULL
2825 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2826 == bfd_target_elf_flavour
))
2827 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2829 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2832 if (h
->dynindx
== -1
2833 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2834 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2836 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2844 /* If this is a final link, and the symbol was defined as a common
2845 symbol in a regular object file, and there was no definition in
2846 any dynamic object, then the linker will have allocated space for
2847 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2848 flag will not have been set. */
2849 if (h
->root
.type
== bfd_link_hash_defined
2850 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2851 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2852 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2853 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2854 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2856 /* If -Bsymbolic was used (which means to bind references to global
2857 symbols to the definition within the shared object), and this
2858 symbol was defined in a regular object, then it actually doesn't
2859 need a PLT entry. */
2860 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2861 && eif
->info
->shared
2862 && eif
->info
->symbolic
2863 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2865 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2866 h
->plt
.offset
= (bfd_vma
) -1;
2872 /* Make the backend pick a good value for a dynamic symbol. This is
2873 called via elf_link_hash_traverse, and also calls itself
2877 elf_adjust_dynamic_symbol (h
, data
)
2878 struct elf_link_hash_entry
*h
;
2881 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2883 struct elf_backend_data
*bed
;
2885 /* Ignore indirect symbols. These are added by the versioning code. */
2886 if (h
->root
.type
== bfd_link_hash_indirect
)
2889 /* Fix the symbol flags. */
2890 if (! elf_fix_symbol_flags (h
, eif
))
2893 /* If this symbol does not require a PLT entry, and it is not
2894 defined by a dynamic object, or is not referenced by a regular
2895 object, ignore it. We do have to handle a weak defined symbol,
2896 even if no regular object refers to it, if we decided to add it
2897 to the dynamic symbol table. FIXME: Do we normally need to worry
2898 about symbols which are defined by one dynamic object and
2899 referenced by another one? */
2900 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2901 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2902 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2903 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2904 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2906 h
->plt
.offset
= (bfd_vma
) -1;
2910 /* If we've already adjusted this symbol, don't do it again. This
2911 can happen via a recursive call. */
2912 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2915 /* Don't look at this symbol again. Note that we must set this
2916 after checking the above conditions, because we may look at a
2917 symbol once, decide not to do anything, and then get called
2918 recursively later after REF_REGULAR is set below. */
2919 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2921 /* If this is a weak definition, and we know a real definition, and
2922 the real symbol is not itself defined by a regular object file,
2923 then get a good value for the real definition. We handle the
2924 real symbol first, for the convenience of the backend routine.
2926 Note that there is a confusing case here. If the real definition
2927 is defined by a regular object file, we don't get the real symbol
2928 from the dynamic object, but we do get the weak symbol. If the
2929 processor backend uses a COPY reloc, then if some routine in the
2930 dynamic object changes the real symbol, we will not see that
2931 change in the corresponding weak symbol. This is the way other
2932 ELF linkers work as well, and seems to be a result of the shared
2935 I will clarify this issue. Most SVR4 shared libraries define the
2936 variable _timezone and define timezone as a weak synonym. The
2937 tzset call changes _timezone. If you write
2938 extern int timezone;
2940 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2941 you might expect that, since timezone is a synonym for _timezone,
2942 the same number will print both times. However, if the processor
2943 backend uses a COPY reloc, then actually timezone will be copied
2944 into your process image, and, since you define _timezone
2945 yourself, _timezone will not. Thus timezone and _timezone will
2946 wind up at different memory locations. The tzset call will set
2947 _timezone, leaving timezone unchanged. */
2949 if (h
->weakdef
!= NULL
)
2951 struct elf_link_hash_entry
*weakdef
;
2953 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2954 || h
->root
.type
== bfd_link_hash_defweak
);
2955 weakdef
= h
->weakdef
;
2956 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2957 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2958 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2959 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2961 /* This symbol is defined by a regular object file, so we
2962 will not do anything special. Clear weakdef for the
2963 convenience of the processor backend. */
2968 /* There is an implicit reference by a regular object file
2969 via the weak symbol. */
2970 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2971 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2976 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2977 bed
= get_elf_backend_data (dynobj
);
2978 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2987 /* This routine is used to export all defined symbols into the dynamic
2988 symbol table. It is called via elf_link_hash_traverse. */
2991 elf_export_symbol (h
, data
)
2992 struct elf_link_hash_entry
*h
;
2995 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2997 /* Ignore indirect symbols. These are added by the versioning code. */
2998 if (h
->root
.type
== bfd_link_hash_indirect
)
3001 if (h
->dynindx
== -1
3002 && (h
->elf_link_hash_flags
3003 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3005 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3015 /* Look through the symbols which are defined in other shared
3016 libraries and referenced here. Update the list of version
3017 dependencies. This will be put into the .gnu.version_r section.
3018 This function is called via elf_link_hash_traverse. */
3021 elf_link_find_version_dependencies (h
, data
)
3022 struct elf_link_hash_entry
*h
;
3025 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3026 Elf_Internal_Verneed
*t
;
3027 Elf_Internal_Vernaux
*a
;
3029 /* We only care about symbols defined in shared objects with version
3031 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3032 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3034 || h
->verinfo
.verdef
== NULL
)
3037 /* See if we already know about this version. */
3038 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3040 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3043 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3044 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3050 /* This is a new version. Add it to tree we are building. */
3054 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3057 rinfo
->failed
= true;
3061 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3062 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3063 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3066 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3068 /* Note that we are copying a string pointer here, and testing it
3069 above. If bfd_elf_string_from_elf_section is ever changed to
3070 discard the string data when low in memory, this will have to be
3072 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3074 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3075 a
->vna_nextptr
= t
->vn_auxptr
;
3077 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3080 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3087 /* Figure out appropriate versions for all the symbols. We may not
3088 have the version number script until we have read all of the input
3089 files, so until that point we don't know which symbols should be
3090 local. This function is called via elf_link_hash_traverse. */
3093 elf_link_assign_sym_version (h
, data
)
3094 struct elf_link_hash_entry
*h
;
3097 struct elf_assign_sym_version_info
*sinfo
=
3098 (struct elf_assign_sym_version_info
*) data
;
3099 struct bfd_link_info
*info
= sinfo
->info
;
3100 struct elf_info_failed eif
;
3103 /* Fix the symbol flags. */
3106 if (! elf_fix_symbol_flags (h
, &eif
))
3109 sinfo
->failed
= true;
3113 /* We only need version numbers for symbols defined in regular
3115 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3118 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3119 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3121 struct bfd_elf_version_tree
*t
;
3126 /* There are two consecutive ELF_VER_CHR characters if this is
3127 not a hidden symbol. */
3129 if (*p
== ELF_VER_CHR
)
3135 /* If there is no version string, we can just return out. */
3139 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3143 /* Look for the version. If we find it, it is no longer weak. */
3144 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3146 if (strcmp (t
->name
, p
) == 0)
3150 struct bfd_elf_version_expr
*d
;
3152 len
= p
- h
->root
.root
.string
;
3153 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3156 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3157 alc
[len
- 1] = '\0';
3158 if (alc
[len
- 2] == ELF_VER_CHR
)
3159 alc
[len
- 2] = '\0';
3161 h
->verinfo
.vertree
= t
;
3165 if (t
->globals
!= NULL
)
3167 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3169 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3170 || fnmatch (d
->match
, alc
, 0) == 0)
3175 /* See if there is anything to force this symbol to
3177 if (d
== NULL
&& t
->locals
!= NULL
)
3179 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3181 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3182 || fnmatch (d
->match
, alc
, 0) == 0)
3184 if (h
->dynindx
!= -1
3186 && ! sinfo
->export_dynamic
)
3188 sinfo
->removed_dynamic
= true;
3189 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3190 h
->elf_link_hash_flags
&=~
3191 ELF_LINK_HASH_NEEDS_PLT
;
3193 h
->plt
.offset
= (bfd_vma
) -1;
3194 /* FIXME: The name of the symbol has
3195 already been recorded in the dynamic
3196 string table section. */
3204 bfd_release (sinfo
->output_bfd
, alc
);
3209 /* If we are building an application, we need to create a
3210 version node for this version. */
3211 if (t
== NULL
&& ! info
->shared
)
3213 struct bfd_elf_version_tree
**pp
;
3216 /* If we aren't going to export this symbol, we don't need
3217 to worry about it. */
3218 if (h
->dynindx
== -1)
3221 t
= ((struct bfd_elf_version_tree
*)
3222 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3225 sinfo
->failed
= true;
3234 t
->name_indx
= (unsigned int) -1;
3238 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3240 t
->vernum
= version_index
;
3244 h
->verinfo
.vertree
= t
;
3248 /* We could not find the version for a symbol when
3249 generating a shared archive. Return an error. */
3250 (*_bfd_error_handler
)
3251 (_("%s: undefined versioned symbol name %s"),
3252 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3253 bfd_set_error (bfd_error_bad_value
);
3254 sinfo
->failed
= true;
3259 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3262 /* If we don't have a version for this symbol, see if we can find
3264 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3266 struct bfd_elf_version_tree
*t
;
3267 struct bfd_elf_version_tree
*deflt
;
3268 struct bfd_elf_version_expr
*d
;
3270 /* See if can find what version this symbol is in. If the
3271 symbol is supposed to be local, then don't actually register
3274 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3276 if (t
->globals
!= NULL
)
3278 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3280 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3282 h
->verinfo
.vertree
= t
;
3291 if (t
->locals
!= NULL
)
3293 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3295 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3297 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3299 h
->verinfo
.vertree
= t
;
3300 if (h
->dynindx
!= -1
3302 && ! sinfo
->export_dynamic
)
3304 sinfo
->removed_dynamic
= true;
3305 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3306 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3308 h
->plt
.offset
= (bfd_vma
) -1;
3309 /* FIXME: The name of the symbol has already
3310 been recorded in the dynamic string table
3322 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3324 h
->verinfo
.vertree
= deflt
;
3325 if (h
->dynindx
!= -1
3327 && ! sinfo
->export_dynamic
)
3329 sinfo
->removed_dynamic
= true;
3330 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3331 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3333 h
->plt
.offset
= (bfd_vma
) -1;
3334 /* FIXME: The name of the symbol has already been
3335 recorded in the dynamic string table section. */
3343 /* This function is used to renumber the dynamic symbols, if some of
3344 them are removed because they are marked as local. This is called
3345 via elf_link_hash_traverse. */
3348 elf_link_renumber_dynsyms (h
, data
)
3349 struct elf_link_hash_entry
*h
;
3352 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3354 if (h
->dynindx
!= -1)
3356 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3357 ++elf_hash_table (info
)->dynsymcount
;
3363 /* Final phase of ELF linker. */
3365 /* A structure we use to avoid passing large numbers of arguments. */
3367 struct elf_final_link_info
3369 /* General link information. */
3370 struct bfd_link_info
*info
;
3373 /* Symbol string table. */
3374 struct bfd_strtab_hash
*symstrtab
;
3375 /* .dynsym section. */
3376 asection
*dynsym_sec
;
3377 /* .hash section. */
3379 /* symbol version section (.gnu.version). */
3380 asection
*symver_sec
;
3381 /* Buffer large enough to hold contents of any section. */
3383 /* Buffer large enough to hold external relocs of any section. */
3384 PTR external_relocs
;
3385 /* Buffer large enough to hold internal relocs of any section. */
3386 Elf_Internal_Rela
*internal_relocs
;
3387 /* Buffer large enough to hold external local symbols of any input
3389 Elf_External_Sym
*external_syms
;
3390 /* Buffer large enough to hold internal local symbols of any input
3392 Elf_Internal_Sym
*internal_syms
;
3393 /* Array large enough to hold a symbol index for each local symbol
3394 of any input BFD. */
3396 /* Array large enough to hold a section pointer for each local
3397 symbol of any input BFD. */
3398 asection
**sections
;
3399 /* Buffer to hold swapped out symbols. */
3400 Elf_External_Sym
*symbuf
;
3401 /* Number of swapped out symbols in buffer. */
3402 size_t symbuf_count
;
3403 /* Number of symbols which fit in symbuf. */
3407 static boolean elf_link_output_sym
3408 PARAMS ((struct elf_final_link_info
*, const char *,
3409 Elf_Internal_Sym
*, asection
*));
3410 static boolean elf_link_flush_output_syms
3411 PARAMS ((struct elf_final_link_info
*));
3412 static boolean elf_link_output_extsym
3413 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3414 static boolean elf_link_input_bfd
3415 PARAMS ((struct elf_final_link_info
*, bfd
*));
3416 static boolean elf_reloc_link_order
3417 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3418 struct bfd_link_order
*));
3420 /* This struct is used to pass information to elf_link_output_extsym. */
3422 struct elf_outext_info
3426 struct elf_final_link_info
*finfo
;
3429 /* Do the final step of an ELF link. */
3432 elf_bfd_final_link (abfd
, info
)
3434 struct bfd_link_info
*info
;
3438 struct elf_final_link_info finfo
;
3439 register asection
*o
;
3440 register struct bfd_link_order
*p
;
3442 size_t max_contents_size
;
3443 size_t max_external_reloc_size
;
3444 size_t max_internal_reloc_count
;
3445 size_t max_sym_count
;
3447 Elf_Internal_Sym elfsym
;
3449 Elf_Internal_Shdr
*symtab_hdr
;
3450 Elf_Internal_Shdr
*symstrtab_hdr
;
3451 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3452 struct elf_outext_info eoinfo
;
3455 abfd
->flags
|= DYNAMIC
;
3457 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3458 dynobj
= elf_hash_table (info
)->dynobj
;
3461 finfo
.output_bfd
= abfd
;
3462 finfo
.symstrtab
= elf_stringtab_init ();
3463 if (finfo
.symstrtab
== NULL
)
3468 finfo
.dynsym_sec
= NULL
;
3469 finfo
.hash_sec
= NULL
;
3470 finfo
.symver_sec
= NULL
;
3474 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3475 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3476 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3477 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3478 /* Note that it is OK if symver_sec is NULL. */
3481 finfo
.contents
= NULL
;
3482 finfo
.external_relocs
= NULL
;
3483 finfo
.internal_relocs
= NULL
;
3484 finfo
.external_syms
= NULL
;
3485 finfo
.internal_syms
= NULL
;
3486 finfo
.indices
= NULL
;
3487 finfo
.sections
= NULL
;
3488 finfo
.symbuf
= NULL
;
3489 finfo
.symbuf_count
= 0;
3491 /* Count up the number of relocations we will output for each output
3492 section, so that we know the sizes of the reloc sections. We
3493 also figure out some maximum sizes. */
3494 max_contents_size
= 0;
3495 max_external_reloc_size
= 0;
3496 max_internal_reloc_count
= 0;
3498 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3502 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3504 if (p
->type
== bfd_section_reloc_link_order
3505 || p
->type
== bfd_symbol_reloc_link_order
)
3507 else if (p
->type
== bfd_indirect_link_order
)
3511 sec
= p
->u
.indirect
.section
;
3513 /* Mark all sections which are to be included in the
3514 link. This will normally be every section. We need
3515 to do this so that we can identify any sections which
3516 the linker has decided to not include. */
3517 sec
->linker_mark
= true;
3519 if (info
->relocateable
)
3520 o
->reloc_count
+= sec
->reloc_count
;
3522 if (sec
->_raw_size
> max_contents_size
)
3523 max_contents_size
= sec
->_raw_size
;
3524 if (sec
->_cooked_size
> max_contents_size
)
3525 max_contents_size
= sec
->_cooked_size
;
3527 /* We are interested in just local symbols, not all
3529 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3530 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3534 if (elf_bad_symtab (sec
->owner
))
3535 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3536 / sizeof (Elf_External_Sym
));
3538 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3540 if (sym_count
> max_sym_count
)
3541 max_sym_count
= sym_count
;
3543 if ((sec
->flags
& SEC_RELOC
) != 0)
3547 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3548 if (ext_size
> max_external_reloc_size
)
3549 max_external_reloc_size
= ext_size
;
3550 if (sec
->reloc_count
> max_internal_reloc_count
)
3551 max_internal_reloc_count
= sec
->reloc_count
;
3557 if (o
->reloc_count
> 0)
3558 o
->flags
|= SEC_RELOC
;
3561 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3562 set it (this is probably a bug) and if it is set
3563 assign_section_numbers will create a reloc section. */
3564 o
->flags
&=~ SEC_RELOC
;
3567 /* If the SEC_ALLOC flag is not set, force the section VMA to
3568 zero. This is done in elf_fake_sections as well, but forcing
3569 the VMA to 0 here will ensure that relocs against these
3570 sections are handled correctly. */
3571 if ((o
->flags
& SEC_ALLOC
) == 0
3572 && ! o
->user_set_vma
)
3576 /* Figure out the file positions for everything but the symbol table
3577 and the relocs. We set symcount to force assign_section_numbers
3578 to create a symbol table. */
3579 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3580 BFD_ASSERT (! abfd
->output_has_begun
);
3581 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3584 /* That created the reloc sections. Set their sizes, and assign
3585 them file positions, and allocate some buffers. */
3586 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3588 if ((o
->flags
& SEC_RELOC
) != 0)
3590 Elf_Internal_Shdr
*rel_hdr
;
3591 register struct elf_link_hash_entry
**p
, **pend
;
3593 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3595 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3597 /* The contents field must last into write_object_contents,
3598 so we allocate it with bfd_alloc rather than malloc. */
3599 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3600 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3603 p
= ((struct elf_link_hash_entry
**)
3604 bfd_malloc (o
->reloc_count
3605 * sizeof (struct elf_link_hash_entry
*)));
3606 if (p
== NULL
&& o
->reloc_count
!= 0)
3608 elf_section_data (o
)->rel_hashes
= p
;
3609 pend
= p
+ o
->reloc_count
;
3610 for (; p
< pend
; p
++)
3613 /* Use the reloc_count field as an index when outputting the
3619 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3621 /* We have now assigned file positions for all the sections except
3622 .symtab and .strtab. We start the .symtab section at the current
3623 file position, and write directly to it. We build the .strtab
3624 section in memory. */
3626 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3627 /* sh_name is set in prep_headers. */
3628 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3629 symtab_hdr
->sh_flags
= 0;
3630 symtab_hdr
->sh_addr
= 0;
3631 symtab_hdr
->sh_size
= 0;
3632 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3633 /* sh_link is set in assign_section_numbers. */
3634 /* sh_info is set below. */
3635 /* sh_offset is set just below. */
3636 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3638 off
= elf_tdata (abfd
)->next_file_pos
;
3639 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3641 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3642 incorrect. We do not yet know the size of the .symtab section.
3643 We correct next_file_pos below, after we do know the size. */
3645 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3646 continuously seeking to the right position in the file. */
3647 if (! info
->keep_memory
|| max_sym_count
< 20)
3648 finfo
.symbuf_size
= 20;
3650 finfo
.symbuf_size
= max_sym_count
;
3651 finfo
.symbuf
= ((Elf_External_Sym
*)
3652 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3653 if (finfo
.symbuf
== NULL
)
3656 /* Start writing out the symbol table. The first symbol is always a
3658 if (info
->strip
!= strip_all
|| info
->relocateable
)
3660 elfsym
.st_value
= 0;
3663 elfsym
.st_other
= 0;
3664 elfsym
.st_shndx
= SHN_UNDEF
;
3665 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3666 &elfsym
, bfd_und_section_ptr
))
3671 /* Some standard ELF linkers do this, but we don't because it causes
3672 bootstrap comparison failures. */
3673 /* Output a file symbol for the output file as the second symbol.
3674 We output this even if we are discarding local symbols, although
3675 I'm not sure if this is correct. */
3676 elfsym
.st_value
= 0;
3678 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3679 elfsym
.st_other
= 0;
3680 elfsym
.st_shndx
= SHN_ABS
;
3681 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3682 &elfsym
, bfd_abs_section_ptr
))
3686 /* Output a symbol for each section. We output these even if we are
3687 discarding local symbols, since they are used for relocs. These
3688 symbols have no names. We store the index of each one in the
3689 index field of the section, so that we can find it again when
3690 outputting relocs. */
3691 if (info
->strip
!= strip_all
|| info
->relocateable
)
3694 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3695 elfsym
.st_other
= 0;
3696 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3698 o
= section_from_elf_index (abfd
, i
);
3700 o
->target_index
= abfd
->symcount
;
3701 elfsym
.st_shndx
= i
;
3702 if (info
->relocateable
|| o
== NULL
)
3703 elfsym
.st_value
= 0;
3705 elfsym
.st_value
= o
->vma
;
3706 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3712 /* Allocate some memory to hold information read in from the input
3714 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3715 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3716 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3717 bfd_malloc (max_internal_reloc_count
3718 * sizeof (Elf_Internal_Rela
)));
3719 finfo
.external_syms
= ((Elf_External_Sym
*)
3720 bfd_malloc (max_sym_count
3721 * sizeof (Elf_External_Sym
)));
3722 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3723 bfd_malloc (max_sym_count
3724 * sizeof (Elf_Internal_Sym
)));
3725 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3726 finfo
.sections
= ((asection
**)
3727 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3728 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3729 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3730 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3731 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3732 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3733 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3734 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3737 /* Since ELF permits relocations to be against local symbols, we
3738 must have the local symbols available when we do the relocations.
3739 Since we would rather only read the local symbols once, and we
3740 would rather not keep them in memory, we handle all the
3741 relocations for a single input file at the same time.
3743 Unfortunately, there is no way to know the total number of local
3744 symbols until we have seen all of them, and the local symbol
3745 indices precede the global symbol indices. This means that when
3746 we are generating relocateable output, and we see a reloc against
3747 a global symbol, we can not know the symbol index until we have
3748 finished examining all the local symbols to see which ones we are
3749 going to output. To deal with this, we keep the relocations in
3750 memory, and don't output them until the end of the link. This is
3751 an unfortunate waste of memory, but I don't see a good way around
3752 it. Fortunately, it only happens when performing a relocateable
3753 link, which is not the common case. FIXME: If keep_memory is set
3754 we could write the relocs out and then read them again; I don't
3755 know how bad the memory loss will be. */
3757 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3758 sub
->output_has_begun
= false;
3759 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3761 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3763 if (p
->type
== bfd_indirect_link_order
3764 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3765 == bfd_target_elf_flavour
))
3767 sub
= p
->u
.indirect
.section
->owner
;
3768 if (! sub
->output_has_begun
)
3770 if (! elf_link_input_bfd (&finfo
, sub
))
3772 sub
->output_has_begun
= true;
3775 else if (p
->type
== bfd_section_reloc_link_order
3776 || p
->type
== bfd_symbol_reloc_link_order
)
3778 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3783 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3789 /* That wrote out all the local symbols. Finish up the symbol table
3790 with the global symbols. */
3792 if (info
->strip
!= strip_all
&& info
->shared
)
3794 /* Output any global symbols that got converted to local in a
3795 version script. We do this in a separate step since ELF
3796 requires all local symbols to appear prior to any global
3797 symbols. FIXME: We should only do this if some global
3798 symbols were, in fact, converted to become local. FIXME:
3799 Will this work correctly with the Irix 5 linker? */
3800 eoinfo
.failed
= false;
3801 eoinfo
.finfo
= &finfo
;
3802 eoinfo
.localsyms
= true;
3803 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3809 /* The sh_info field records the index of the first non local
3811 symtab_hdr
->sh_info
= abfd
->symcount
;
3813 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3815 /* We get the global symbols from the hash table. */
3816 eoinfo
.failed
= false;
3817 eoinfo
.localsyms
= false;
3818 eoinfo
.finfo
= &finfo
;
3819 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3824 /* Flush all symbols to the file. */
3825 if (! elf_link_flush_output_syms (&finfo
))
3828 /* Now we know the size of the symtab section. */
3829 off
+= symtab_hdr
->sh_size
;
3831 /* Finish up and write out the symbol string table (.strtab)
3833 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3834 /* sh_name was set in prep_headers. */
3835 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3836 symstrtab_hdr
->sh_flags
= 0;
3837 symstrtab_hdr
->sh_addr
= 0;
3838 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3839 symstrtab_hdr
->sh_entsize
= 0;
3840 symstrtab_hdr
->sh_link
= 0;
3841 symstrtab_hdr
->sh_info
= 0;
3842 /* sh_offset is set just below. */
3843 symstrtab_hdr
->sh_addralign
= 1;
3845 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3846 elf_tdata (abfd
)->next_file_pos
= off
;
3848 if (abfd
->symcount
> 0)
3850 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3851 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3855 /* Adjust the relocs to have the correct symbol indices. */
3856 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3858 struct elf_link_hash_entry
**rel_hash
;
3859 Elf_Internal_Shdr
*rel_hdr
;
3861 if ((o
->flags
& SEC_RELOC
) == 0)
3864 rel_hash
= elf_section_data (o
)->rel_hashes
;
3865 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3866 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3868 if (*rel_hash
== NULL
)
3871 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3873 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3875 Elf_External_Rel
*erel
;
3876 Elf_Internal_Rel irel
;
3878 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3879 elf_swap_reloc_in (abfd
, erel
, &irel
);
3880 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3881 ELF_R_TYPE (irel
.r_info
));
3882 elf_swap_reloc_out (abfd
, &irel
, erel
);
3886 Elf_External_Rela
*erela
;
3887 Elf_Internal_Rela irela
;
3889 BFD_ASSERT (rel_hdr
->sh_entsize
3890 == sizeof (Elf_External_Rela
));
3892 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3893 elf_swap_reloca_in (abfd
, erela
, &irela
);
3894 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3895 ELF_R_TYPE (irela
.r_info
));
3896 elf_swap_reloca_out (abfd
, &irela
, erela
);
3900 /* Set the reloc_count field to 0 to prevent write_relocs from
3901 trying to swap the relocs out itself. */
3905 /* If we are linking against a dynamic object, or generating a
3906 shared library, finish up the dynamic linking information. */
3909 Elf_External_Dyn
*dyncon
, *dynconend
;
3911 /* Fix up .dynamic entries. */
3912 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3913 BFD_ASSERT (o
!= NULL
);
3915 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3916 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3917 for (; dyncon
< dynconend
; dyncon
++)
3919 Elf_Internal_Dyn dyn
;
3923 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3930 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3931 magic _init and _fini symbols. This is pretty ugly,
3932 but we are compatible. */
3940 struct elf_link_hash_entry
*h
;
3942 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3943 false, false, true);
3945 && (h
->root
.type
== bfd_link_hash_defined
3946 || h
->root
.type
== bfd_link_hash_defweak
))
3948 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3949 o
= h
->root
.u
.def
.section
;
3950 if (o
->output_section
!= NULL
)
3951 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3952 + o
->output_offset
);
3955 /* The symbol is imported from another shared
3956 library and does not apply to this one. */
3960 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3975 name
= ".gnu.version_d";
3978 name
= ".gnu.version_r";
3981 name
= ".gnu.version";
3983 o
= bfd_get_section_by_name (abfd
, name
);
3984 BFD_ASSERT (o
!= NULL
);
3985 dyn
.d_un
.d_ptr
= o
->vma
;
3986 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3993 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3998 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4000 Elf_Internal_Shdr
*hdr
;
4002 hdr
= elf_elfsections (abfd
)[i
];
4003 if (hdr
->sh_type
== type
4004 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4006 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4007 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4010 if (dyn
.d_un
.d_val
== 0
4011 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4012 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4016 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4022 /* If we have created any dynamic sections, then output them. */
4025 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4028 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4030 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4031 || o
->_raw_size
== 0)
4033 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4035 /* At this point, we are only interested in sections
4036 created by elf_link_create_dynamic_sections. */
4039 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4041 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4043 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4044 o
->contents
, o
->output_offset
,
4052 /* The contents of the .dynstr section are actually in a
4054 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4055 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4056 || ! _bfd_stringtab_emit (abfd
,
4057 elf_hash_table (info
)->dynstr
))
4063 /* If we have optimized stabs strings, output them. */
4064 if (elf_hash_table (info
)->stab_info
!= NULL
)
4066 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4070 if (finfo
.symstrtab
!= NULL
)
4071 _bfd_stringtab_free (finfo
.symstrtab
);
4072 if (finfo
.contents
!= NULL
)
4073 free (finfo
.contents
);
4074 if (finfo
.external_relocs
!= NULL
)
4075 free (finfo
.external_relocs
);
4076 if (finfo
.internal_relocs
!= NULL
)
4077 free (finfo
.internal_relocs
);
4078 if (finfo
.external_syms
!= NULL
)
4079 free (finfo
.external_syms
);
4080 if (finfo
.internal_syms
!= NULL
)
4081 free (finfo
.internal_syms
);
4082 if (finfo
.indices
!= NULL
)
4083 free (finfo
.indices
);
4084 if (finfo
.sections
!= NULL
)
4085 free (finfo
.sections
);
4086 if (finfo
.symbuf
!= NULL
)
4087 free (finfo
.symbuf
);
4088 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4090 if ((o
->flags
& SEC_RELOC
) != 0
4091 && elf_section_data (o
)->rel_hashes
!= NULL
)
4092 free (elf_section_data (o
)->rel_hashes
);
4095 elf_tdata (abfd
)->linker
= true;
4100 if (finfo
.symstrtab
!= NULL
)
4101 _bfd_stringtab_free (finfo
.symstrtab
);
4102 if (finfo
.contents
!= NULL
)
4103 free (finfo
.contents
);
4104 if (finfo
.external_relocs
!= NULL
)
4105 free (finfo
.external_relocs
);
4106 if (finfo
.internal_relocs
!= NULL
)
4107 free (finfo
.internal_relocs
);
4108 if (finfo
.external_syms
!= NULL
)
4109 free (finfo
.external_syms
);
4110 if (finfo
.internal_syms
!= NULL
)
4111 free (finfo
.internal_syms
);
4112 if (finfo
.indices
!= NULL
)
4113 free (finfo
.indices
);
4114 if (finfo
.sections
!= NULL
)
4115 free (finfo
.sections
);
4116 if (finfo
.symbuf
!= NULL
)
4117 free (finfo
.symbuf
);
4118 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4120 if ((o
->flags
& SEC_RELOC
) != 0
4121 && elf_section_data (o
)->rel_hashes
!= NULL
)
4122 free (elf_section_data (o
)->rel_hashes
);
4128 /* Add a symbol to the output symbol table. */
4131 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4132 struct elf_final_link_info
*finfo
;
4134 Elf_Internal_Sym
*elfsym
;
4135 asection
*input_sec
;
4137 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4138 struct bfd_link_info
*info
,
4143 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4144 elf_backend_link_output_symbol_hook
;
4145 if (output_symbol_hook
!= NULL
)
4147 if (! ((*output_symbol_hook
)
4148 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4152 if (name
== (const char *) NULL
|| *name
== '\0')
4153 elfsym
->st_name
= 0;
4156 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4159 if (elfsym
->st_name
== (unsigned long) -1)
4163 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4165 if (! elf_link_flush_output_syms (finfo
))
4169 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4170 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4171 ++finfo
->symbuf_count
;
4173 ++finfo
->output_bfd
->symcount
;
4178 /* Flush the output symbols to the file. */
4181 elf_link_flush_output_syms (finfo
)
4182 struct elf_final_link_info
*finfo
;
4184 if (finfo
->symbuf_count
> 0)
4186 Elf_Internal_Shdr
*symtab
;
4188 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4190 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4192 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4193 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4194 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4197 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4199 finfo
->symbuf_count
= 0;
4205 /* Add an external symbol to the symbol table. This is called from
4206 the hash table traversal routine. When generating a shared object,
4207 we go through the symbol table twice. The first time we output
4208 anything that might have been forced to local scope in a version
4209 script. The second time we output the symbols that are still
4213 elf_link_output_extsym (h
, data
)
4214 struct elf_link_hash_entry
*h
;
4217 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4218 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4220 Elf_Internal_Sym sym
;
4221 asection
*input_sec
;
4223 /* Decide whether to output this symbol in this pass. */
4224 if (eoinfo
->localsyms
)
4226 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4231 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4235 /* If we are not creating a shared library, and this symbol is
4236 referenced by a shared library but is not defined anywhere, then
4237 warn that it is undefined. If we do not do this, the runtime
4238 linker will complain that the symbol is undefined when the
4239 program is run. We don't have to worry about symbols that are
4240 referenced by regular files, because we will already have issued
4241 warnings for them. */
4242 if (! finfo
->info
->relocateable
4243 && ! finfo
->info
->shared
4244 && h
->root
.type
== bfd_link_hash_undefined
4245 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4246 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4248 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4249 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4250 (asection
*) NULL
, 0)))
4252 eoinfo
->failed
= true;
4257 /* We don't want to output symbols that have never been mentioned by
4258 a regular file, or that we have been told to strip. However, if
4259 h->indx is set to -2, the symbol is used by a reloc and we must
4263 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4264 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4265 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4266 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4268 else if (finfo
->info
->strip
== strip_all
4269 || (finfo
->info
->strip
== strip_some
4270 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4271 h
->root
.root
.string
,
4272 false, false) == NULL
))
4277 /* If we're stripping it, and it's not a dynamic symbol, there's
4278 nothing else to do. */
4279 if (strip
&& h
->dynindx
== -1)
4283 sym
.st_size
= h
->size
;
4284 sym
.st_other
= h
->other
;
4285 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4286 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4287 else if (h
->root
.type
== bfd_link_hash_undefweak
4288 || h
->root
.type
== bfd_link_hash_defweak
)
4289 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4291 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4293 switch (h
->root
.type
)
4296 case bfd_link_hash_new
:
4300 case bfd_link_hash_undefined
:
4301 input_sec
= bfd_und_section_ptr
;
4302 sym
.st_shndx
= SHN_UNDEF
;
4305 case bfd_link_hash_undefweak
:
4306 input_sec
= bfd_und_section_ptr
;
4307 sym
.st_shndx
= SHN_UNDEF
;
4310 case bfd_link_hash_defined
:
4311 case bfd_link_hash_defweak
:
4313 input_sec
= h
->root
.u
.def
.section
;
4314 if (input_sec
->output_section
!= NULL
)
4317 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4318 input_sec
->output_section
);
4319 if (sym
.st_shndx
== (unsigned short) -1)
4321 (*_bfd_error_handler
)
4322 (_("%s: could not find output section %s for input section %s"),
4323 bfd_get_filename (finfo
->output_bfd
),
4324 input_sec
->output_section
->name
,
4326 eoinfo
->failed
= true;
4330 /* ELF symbols in relocateable files are section relative,
4331 but in nonrelocateable files they are virtual
4333 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4334 if (! finfo
->info
->relocateable
)
4335 sym
.st_value
+= input_sec
->output_section
->vma
;
4339 BFD_ASSERT (input_sec
->owner
== NULL
4340 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4341 sym
.st_shndx
= SHN_UNDEF
;
4342 input_sec
= bfd_und_section_ptr
;
4347 case bfd_link_hash_common
:
4348 input_sec
= h
->root
.u
.c
.p
->section
;
4349 sym
.st_shndx
= SHN_COMMON
;
4350 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4353 case bfd_link_hash_indirect
:
4354 /* These symbols are created by symbol versioning. They point
4355 to the decorated version of the name. For example, if the
4356 symbol foo@@GNU_1.2 is the default, which should be used when
4357 foo is used with no version, then we add an indirect symbol
4358 foo which points to foo@@GNU_1.2. We ignore these symbols,
4359 since the indirected symbol is already in the hash table. If
4360 the indirect symbol is non-ELF, fall through and output it. */
4361 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4365 case bfd_link_hash_warning
:
4366 /* We can't represent these symbols in ELF, although a warning
4367 symbol may have come from a .gnu.warning.SYMBOL section. We
4368 just put the target symbol in the hash table. If the target
4369 symbol does not really exist, don't do anything. */
4370 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4372 return (elf_link_output_extsym
4373 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4376 /* Give the processor backend a chance to tweak the symbol value,
4377 and also to finish up anything that needs to be done for this
4379 if ((h
->dynindx
!= -1
4380 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4381 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4383 struct elf_backend_data
*bed
;
4385 bed
= get_elf_backend_data (finfo
->output_bfd
);
4386 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4387 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4389 eoinfo
->failed
= true;
4394 /* If this symbol should be put in the .dynsym section, then put it
4395 there now. We have already know the symbol index. We also fill
4396 in the entry in the .hash section. */
4397 if (h
->dynindx
!= -1
4398 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4404 bfd_byte
*bucketpos
;
4407 sym
.st_name
= h
->dynstr_index
;
4409 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4410 (PTR
) (((Elf_External_Sym
*)
4411 finfo
->dynsym_sec
->contents
)
4414 /* We didn't include the version string in the dynamic string
4415 table, so we must not consider it in the hash table. */
4416 name
= h
->root
.root
.string
;
4417 p
= strchr (name
, ELF_VER_CHR
);
4422 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4423 strncpy (copy
, name
, p
- name
);
4424 copy
[p
- name
] = '\0';
4428 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4429 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4430 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4431 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4432 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4433 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4434 put_word (finfo
->output_bfd
, chain
,
4435 ((bfd_byte
*) finfo
->hash_sec
->contents
4436 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4439 bfd_release (finfo
->output_bfd
, copy
);
4441 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4443 Elf_Internal_Versym iversym
;
4445 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4447 if (h
->verinfo
.verdef
== NULL
)
4448 iversym
.vs_vers
= 0;
4450 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4454 if (h
->verinfo
.vertree
== NULL
)
4455 iversym
.vs_vers
= 1;
4457 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4460 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4461 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4463 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4464 (((Elf_External_Versym
*)
4465 finfo
->symver_sec
->contents
)
4470 /* If we're stripping it, then it was just a dynamic symbol, and
4471 there's nothing else to do. */
4475 h
->indx
= finfo
->output_bfd
->symcount
;
4477 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4479 eoinfo
->failed
= true;
4486 /* Link an input file into the linker output file. This function
4487 handles all the sections and relocations of the input file at once.
4488 This is so that we only have to read the local symbols once, and
4489 don't have to keep them in memory. */
4492 elf_link_input_bfd (finfo
, input_bfd
)
4493 struct elf_final_link_info
*finfo
;
4496 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4497 bfd
*, asection
*, bfd_byte
*,
4498 Elf_Internal_Rela
*,
4499 Elf_Internal_Sym
*, asection
**));
4501 Elf_Internal_Shdr
*symtab_hdr
;
4504 Elf_External_Sym
*external_syms
;
4505 Elf_External_Sym
*esym
;
4506 Elf_External_Sym
*esymend
;
4507 Elf_Internal_Sym
*isym
;
4509 asection
**ppsection
;
4512 output_bfd
= finfo
->output_bfd
;
4514 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4516 /* If this is a dynamic object, we don't want to do anything here:
4517 we don't want the local symbols, and we don't want the section
4519 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4522 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4523 if (elf_bad_symtab (input_bfd
))
4525 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4530 locsymcount
= symtab_hdr
->sh_info
;
4531 extsymoff
= symtab_hdr
->sh_info
;
4534 /* Read the local symbols. */
4535 if (symtab_hdr
->contents
!= NULL
)
4536 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4537 else if (locsymcount
== 0)
4538 external_syms
= NULL
;
4541 external_syms
= finfo
->external_syms
;
4542 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4543 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4544 locsymcount
, input_bfd
)
4545 != locsymcount
* sizeof (Elf_External_Sym
)))
4549 /* Swap in the local symbols and write out the ones which we know
4550 are going into the output file. */
4551 esym
= external_syms
;
4552 esymend
= esym
+ locsymcount
;
4553 isym
= finfo
->internal_syms
;
4554 pindex
= finfo
->indices
;
4555 ppsection
= finfo
->sections
;
4556 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4560 Elf_Internal_Sym osym
;
4562 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4565 if (elf_bad_symtab (input_bfd
))
4567 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4574 if (isym
->st_shndx
== SHN_UNDEF
)
4575 isec
= bfd_und_section_ptr
;
4576 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4577 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4578 else if (isym
->st_shndx
== SHN_ABS
)
4579 isec
= bfd_abs_section_ptr
;
4580 else if (isym
->st_shndx
== SHN_COMMON
)
4581 isec
= bfd_com_section_ptr
;
4590 /* Don't output the first, undefined, symbol. */
4591 if (esym
== external_syms
)
4594 /* If we are stripping all symbols, we don't want to output this
4596 if (finfo
->info
->strip
== strip_all
)
4599 /* We never output section symbols. Instead, we use the section
4600 symbol of the corresponding section in the output file. */
4601 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4604 /* If we are discarding all local symbols, we don't want to
4605 output this one. If we are generating a relocateable output
4606 file, then some of the local symbols may be required by
4607 relocs; we output them below as we discover that they are
4609 if (finfo
->info
->discard
== discard_all
)
4612 /* If this symbol is defined in a section which we are
4613 discarding, we don't need to keep it, but note that
4614 linker_mark is only reliable for sections that have contents.
4615 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4616 as well as linker_mark. */
4617 if (isym
->st_shndx
> 0
4618 && isym
->st_shndx
< SHN_LORESERVE
4620 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4621 || (! finfo
->info
->relocateable
4622 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4625 /* Get the name of the symbol. */
4626 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4631 /* See if we are discarding symbols with this name. */
4632 if ((finfo
->info
->strip
== strip_some
4633 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4635 || (finfo
->info
->discard
== discard_l
4636 && bfd_is_local_label_name (input_bfd
, name
)))
4639 /* If we get here, we are going to output this symbol. */
4643 /* Adjust the section index for the output file. */
4644 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4645 isec
->output_section
);
4646 if (osym
.st_shndx
== (unsigned short) -1)
4649 *pindex
= output_bfd
->symcount
;
4651 /* ELF symbols in relocateable files are section relative, but
4652 in executable files they are virtual addresses. Note that
4653 this code assumes that all ELF sections have an associated
4654 BFD section with a reasonable value for output_offset; below
4655 we assume that they also have a reasonable value for
4656 output_section. Any special sections must be set up to meet
4657 these requirements. */
4658 osym
.st_value
+= isec
->output_offset
;
4659 if (! finfo
->info
->relocateable
)
4660 osym
.st_value
+= isec
->output_section
->vma
;
4662 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4666 /* Relocate the contents of each section. */
4667 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4671 if (! o
->linker_mark
)
4673 /* This section was omitted from the link. */
4677 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4678 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4681 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4683 /* Section was created by elf_link_create_dynamic_sections
4688 /* Get the contents of the section. They have been cached by a
4689 relaxation routine. Note that o is a section in an input
4690 file, so the contents field will not have been set by any of
4691 the routines which work on output files. */
4692 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4693 contents
= elf_section_data (o
)->this_hdr
.contents
;
4696 contents
= finfo
->contents
;
4697 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4698 (file_ptr
) 0, o
->_raw_size
))
4702 if ((o
->flags
& SEC_RELOC
) != 0)
4704 Elf_Internal_Rela
*internal_relocs
;
4706 /* Get the swapped relocs. */
4707 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4708 (input_bfd
, o
, finfo
->external_relocs
,
4709 finfo
->internal_relocs
, false));
4710 if (internal_relocs
== NULL
4711 && o
->reloc_count
> 0)
4714 /* Relocate the section by invoking a back end routine.
4716 The back end routine is responsible for adjusting the
4717 section contents as necessary, and (if using Rela relocs
4718 and generating a relocateable output file) adjusting the
4719 reloc addend as necessary.
4721 The back end routine does not have to worry about setting
4722 the reloc address or the reloc symbol index.
4724 The back end routine is given a pointer to the swapped in
4725 internal symbols, and can access the hash table entries
4726 for the external symbols via elf_sym_hashes (input_bfd).
4728 When generating relocateable output, the back end routine
4729 must handle STB_LOCAL/STT_SECTION symbols specially. The
4730 output symbol is going to be a section symbol
4731 corresponding to the output section, which will require
4732 the addend to be adjusted. */
4734 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4735 input_bfd
, o
, contents
,
4737 finfo
->internal_syms
,
4741 if (finfo
->info
->relocateable
)
4743 Elf_Internal_Rela
*irela
;
4744 Elf_Internal_Rela
*irelaend
;
4745 struct elf_link_hash_entry
**rel_hash
;
4746 Elf_Internal_Shdr
*input_rel_hdr
;
4747 Elf_Internal_Shdr
*output_rel_hdr
;
4749 /* Adjust the reloc addresses and symbol indices. */
4751 irela
= internal_relocs
;
4752 irelaend
= irela
+ o
->reloc_count
;
4753 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4754 + o
->output_section
->reloc_count
);
4755 for (; irela
< irelaend
; irela
++, rel_hash
++)
4757 unsigned long r_symndx
;
4758 Elf_Internal_Sym
*isym
;
4761 irela
->r_offset
+= o
->output_offset
;
4763 r_symndx
= ELF_R_SYM (irela
->r_info
);
4768 if (r_symndx
>= locsymcount
4769 || (elf_bad_symtab (input_bfd
)
4770 && finfo
->sections
[r_symndx
] == NULL
))
4772 struct elf_link_hash_entry
*rh
;
4775 /* This is a reloc against a global symbol. We
4776 have not yet output all the local symbols, so
4777 we do not know the symbol index of any global
4778 symbol. We set the rel_hash entry for this
4779 reloc to point to the global hash table entry
4780 for this symbol. The symbol index is then
4781 set at the end of elf_bfd_final_link. */
4782 indx
= r_symndx
- extsymoff
;
4783 rh
= elf_sym_hashes (input_bfd
)[indx
];
4784 while (rh
->root
.type
== bfd_link_hash_indirect
4785 || rh
->root
.type
== bfd_link_hash_warning
)
4786 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
4788 /* Setting the index to -2 tells
4789 elf_link_output_extsym that this symbol is
4791 BFD_ASSERT (rh
->indx
< 0);
4799 /* This is a reloc against a local symbol. */
4802 isym
= finfo
->internal_syms
+ r_symndx
;
4803 sec
= finfo
->sections
[r_symndx
];
4804 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4806 /* I suppose the backend ought to fill in the
4807 section of any STT_SECTION symbol against a
4808 processor specific section. If we have
4809 discarded a section, the output_section will
4810 be the absolute section. */
4812 && (bfd_is_abs_section (sec
)
4813 || (sec
->output_section
!= NULL
4814 && bfd_is_abs_section (sec
->output_section
))))
4816 else if (sec
== NULL
|| sec
->owner
== NULL
)
4818 bfd_set_error (bfd_error_bad_value
);
4823 r_symndx
= sec
->output_section
->target_index
;
4824 BFD_ASSERT (r_symndx
!= 0);
4829 if (finfo
->indices
[r_symndx
] == -1)
4835 if (finfo
->info
->strip
== strip_all
)
4837 /* You can't do ld -r -s. */
4838 bfd_set_error (bfd_error_invalid_operation
);
4842 /* This symbol was skipped earlier, but
4843 since it is needed by a reloc, we
4844 must output it now. */
4845 link
= symtab_hdr
->sh_link
;
4846 name
= bfd_elf_string_from_elf_section (input_bfd
,
4852 osec
= sec
->output_section
;
4854 _bfd_elf_section_from_bfd_section (output_bfd
,
4856 if (isym
->st_shndx
== (unsigned short) -1)
4859 isym
->st_value
+= sec
->output_offset
;
4860 if (! finfo
->info
->relocateable
)
4861 isym
->st_value
+= osec
->vma
;
4863 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4865 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4869 r_symndx
= finfo
->indices
[r_symndx
];
4872 irela
->r_info
= ELF_R_INFO (r_symndx
,
4873 ELF_R_TYPE (irela
->r_info
));
4876 /* Swap out the relocs. */
4877 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4878 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4879 BFD_ASSERT (output_rel_hdr
->sh_entsize
4880 == input_rel_hdr
->sh_entsize
);
4881 irela
= internal_relocs
;
4882 irelaend
= irela
+ o
->reloc_count
;
4883 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4885 Elf_External_Rel
*erel
;
4887 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4888 + o
->output_section
->reloc_count
);
4889 for (; irela
< irelaend
; irela
++, erel
++)
4891 Elf_Internal_Rel irel
;
4893 irel
.r_offset
= irela
->r_offset
;
4894 irel
.r_info
= irela
->r_info
;
4895 BFD_ASSERT (irela
->r_addend
== 0);
4896 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4901 Elf_External_Rela
*erela
;
4903 BFD_ASSERT (input_rel_hdr
->sh_entsize
4904 == sizeof (Elf_External_Rela
));
4905 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4906 + o
->output_section
->reloc_count
);
4907 for (; irela
< irelaend
; irela
++, erela
++)
4908 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4911 o
->output_section
->reloc_count
+= o
->reloc_count
;
4915 /* Write out the modified section contents. */
4916 if (elf_section_data (o
)->stab_info
== NULL
)
4918 if (! (o
->flags
& SEC_EXCLUDE
) &&
4919 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
4920 contents
, o
->output_offset
,
4921 (o
->_cooked_size
!= 0
4928 if (! (_bfd_write_section_stabs
4929 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4930 o
, &elf_section_data (o
)->stab_info
, contents
)))
4938 /* Generate a reloc when linking an ELF file. This is a reloc
4939 requested by the linker, and does come from any input file. This
4940 is used to build constructor and destructor tables when linking
4944 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4946 struct bfd_link_info
*info
;
4947 asection
*output_section
;
4948 struct bfd_link_order
*link_order
;
4950 reloc_howto_type
*howto
;
4954 struct elf_link_hash_entry
**rel_hash_ptr
;
4955 Elf_Internal_Shdr
*rel_hdr
;
4957 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4960 bfd_set_error (bfd_error_bad_value
);
4964 addend
= link_order
->u
.reloc
.p
->addend
;
4966 /* Figure out the symbol index. */
4967 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4968 + output_section
->reloc_count
);
4969 if (link_order
->type
== bfd_section_reloc_link_order
)
4971 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4972 BFD_ASSERT (indx
!= 0);
4973 *rel_hash_ptr
= NULL
;
4977 struct elf_link_hash_entry
*h
;
4979 /* Treat a reloc against a defined symbol as though it were
4980 actually against the section. */
4981 h
= ((struct elf_link_hash_entry
*)
4982 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4983 link_order
->u
.reloc
.p
->u
.name
,
4984 false, false, true));
4986 && (h
->root
.type
== bfd_link_hash_defined
4987 || h
->root
.type
== bfd_link_hash_defweak
))
4991 section
= h
->root
.u
.def
.section
;
4992 indx
= section
->output_section
->target_index
;
4993 *rel_hash_ptr
= NULL
;
4994 /* It seems that we ought to add the symbol value to the
4995 addend here, but in practice it has already been added
4996 because it was passed to constructor_callback. */
4997 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5001 /* Setting the index to -2 tells elf_link_output_extsym that
5002 this symbol is used by a reloc. */
5009 if (! ((*info
->callbacks
->unattached_reloc
)
5010 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5011 (asection
*) NULL
, (bfd_vma
) 0)))
5017 /* If this is an inplace reloc, we must write the addend into the
5019 if (howto
->partial_inplace
&& addend
!= 0)
5022 bfd_reloc_status_type rstat
;
5026 size
= bfd_get_reloc_size (howto
);
5027 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5028 if (buf
== (bfd_byte
*) NULL
)
5030 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5036 case bfd_reloc_outofrange
:
5038 case bfd_reloc_overflow
:
5039 if (! ((*info
->callbacks
->reloc_overflow
)
5041 (link_order
->type
== bfd_section_reloc_link_order
5042 ? bfd_section_name (output_bfd
,
5043 link_order
->u
.reloc
.p
->u
.section
)
5044 : link_order
->u
.reloc
.p
->u
.name
),
5045 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5053 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5054 (file_ptr
) link_order
->offset
, size
);
5060 /* The address of a reloc is relative to the section in a
5061 relocateable file, and is a virtual address in an executable
5063 offset
= link_order
->offset
;
5064 if (! info
->relocateable
)
5065 offset
+= output_section
->vma
;
5067 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5069 if (rel_hdr
->sh_type
== SHT_REL
)
5071 Elf_Internal_Rel irel
;
5072 Elf_External_Rel
*erel
;
5074 irel
.r_offset
= offset
;
5075 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5076 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5077 + output_section
->reloc_count
);
5078 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5082 Elf_Internal_Rela irela
;
5083 Elf_External_Rela
*erela
;
5085 irela
.r_offset
= offset
;
5086 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5087 irela
.r_addend
= addend
;
5088 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5089 + output_section
->reloc_count
);
5090 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5093 ++output_section
->reloc_count
;
5099 /* Allocate a pointer to live in a linker created section. */
5102 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5104 struct bfd_link_info
*info
;
5105 elf_linker_section_t
*lsect
;
5106 struct elf_link_hash_entry
*h
;
5107 const Elf_Internal_Rela
*rel
;
5109 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5110 elf_linker_section_pointers_t
*linker_section_ptr
;
5111 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5113 BFD_ASSERT (lsect
!= NULL
);
5115 /* Is this a global symbol? */
5118 /* Has this symbol already been allocated, if so, our work is done */
5119 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5124 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5125 /* Make sure this symbol is output as a dynamic symbol. */
5126 if (h
->dynindx
== -1)
5128 if (! elf_link_record_dynamic_symbol (info
, h
))
5132 if (lsect
->rel_section
)
5133 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5136 else /* Allocation of a pointer to a local symbol */
5138 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5140 /* Allocate a table to hold the local symbols if first time */
5143 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5144 register unsigned int i
;
5146 ptr
= (elf_linker_section_pointers_t
**)
5147 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5152 elf_local_ptr_offsets (abfd
) = ptr
;
5153 for (i
= 0; i
< num_symbols
; i
++)
5154 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5157 /* Has this symbol already been allocated, if so, our work is done */
5158 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5163 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5167 /* If we are generating a shared object, we need to
5168 output a R_<xxx>_RELATIVE reloc so that the
5169 dynamic linker can adjust this GOT entry. */
5170 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5171 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5175 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5176 from internal memory. */
5177 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5178 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5179 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5181 if (!linker_section_ptr
)
5184 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5185 linker_section_ptr
->addend
= rel
->r_addend
;
5186 linker_section_ptr
->which
= lsect
->which
;
5187 linker_section_ptr
->written_address_p
= false;
5188 *ptr_linker_section_ptr
= linker_section_ptr
;
5191 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5193 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5194 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5195 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5196 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5198 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5200 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5201 lsect
->sym_hash
->root
.root
.string
,
5202 (long)ARCH_SIZE
/ 8,
5203 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5209 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5211 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5214 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5215 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5223 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5226 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5229 /* Fill in the address for a pointer generated in alinker section. */
5232 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5235 struct bfd_link_info
*info
;
5236 elf_linker_section_t
*lsect
;
5237 struct elf_link_hash_entry
*h
;
5239 const Elf_Internal_Rela
*rel
;
5242 elf_linker_section_pointers_t
*linker_section_ptr
;
5244 BFD_ASSERT (lsect
!= NULL
);
5246 if (h
!= NULL
) /* global symbol */
5248 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5252 BFD_ASSERT (linker_section_ptr
!= NULL
);
5254 if (! elf_hash_table (info
)->dynamic_sections_created
5257 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5259 /* This is actually a static link, or it is a
5260 -Bsymbolic link and the symbol is defined
5261 locally. We must initialize this entry in the
5264 When doing a dynamic link, we create a .rela.<xxx>
5265 relocation entry to initialize the value. This
5266 is done in the finish_dynamic_symbol routine. */
5267 if (!linker_section_ptr
->written_address_p
)
5269 linker_section_ptr
->written_address_p
= true;
5270 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5271 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5275 else /* local symbol */
5277 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5278 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5279 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5280 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5284 BFD_ASSERT (linker_section_ptr
!= NULL
);
5286 /* Write out pointer if it hasn't been rewritten out before */
5287 if (!linker_section_ptr
->written_address_p
)
5289 linker_section_ptr
->written_address_p
= true;
5290 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5291 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5295 asection
*srel
= lsect
->rel_section
;
5296 Elf_Internal_Rela outrel
;
5298 /* We need to generate a relative reloc for the dynamic linker. */
5300 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5303 BFD_ASSERT (srel
!= NULL
);
5305 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5306 + lsect
->section
->output_offset
5307 + linker_section_ptr
->offset
);
5308 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5309 outrel
.r_addend
= 0;
5310 elf_swap_reloca_out (output_bfd
, &outrel
,
5311 (((Elf_External_Rela
*)
5312 lsect
->section
->contents
)
5313 + lsect
->section
->reloc_count
));
5314 ++lsect
->section
->reloc_count
;
5319 relocation
= (lsect
->section
->output_offset
5320 + linker_section_ptr
->offset
5321 - lsect
->hole_offset
5322 - lsect
->sym_offset
);
5325 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5326 lsect
->name
, (long)relocation
, (long)relocation
);
5329 /* Subtract out the addend, because it will get added back in by the normal
5331 return relocation
- linker_section_ptr
->addend
;
5334 /* Garbage collect unused sections. */
5336 static boolean elf_gc_mark
5337 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5338 asection
* (*gc_mark_hook
)
5339 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5340 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5342 static boolean elf_gc_sweep
5343 PARAMS ((struct bfd_link_info
*info
,
5344 boolean (*gc_sweep_hook
)
5345 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5346 const Elf_Internal_Rela
*relocs
))));
5348 static boolean elf_gc_sweep_symbol
5349 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5351 static boolean elf_gc_allocate_got_offsets
5352 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5354 static boolean elf_gc_propagate_vtable_entries_used
5355 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5357 static boolean elf_gc_smash_unused_vtentry_relocs
5358 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5360 /* The mark phase of garbage collection. For a given section, mark
5361 it, and all the sections which define symbols to which it refers. */
5364 elf_gc_mark (info
, sec
, gc_mark_hook
)
5365 struct bfd_link_info
*info
;
5367 asection
* (*gc_mark_hook
)
5368 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5369 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5375 /* Look through the section relocs. */
5377 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5379 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5380 Elf_Internal_Shdr
*symtab_hdr
;
5381 struct elf_link_hash_entry
**sym_hashes
;
5384 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5385 bfd
*input_bfd
= sec
->owner
;
5387 /* GCFIXME: how to arrange so that relocs and symbols are not
5388 reread continually? */
5390 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5391 sym_hashes
= elf_sym_hashes (input_bfd
);
5393 /* Read the local symbols. */
5394 if (elf_bad_symtab (input_bfd
))
5396 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5400 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5401 if (symtab_hdr
->contents
)
5402 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5403 else if (nlocsyms
== 0)
5407 locsyms
= freesyms
=
5408 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5409 if (freesyms
== NULL
5410 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5411 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5412 nlocsyms
, input_bfd
)
5413 != nlocsyms
* sizeof (Elf_External_Sym
)))
5420 /* Read the relocations. */
5421 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5422 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5423 info
->keep_memory
));
5424 if (relstart
== NULL
)
5429 relend
= relstart
+ sec
->reloc_count
;
5431 for (rel
= relstart
; rel
< relend
; rel
++)
5433 unsigned long r_symndx
;
5435 struct elf_link_hash_entry
*h
;
5438 r_symndx
= ELF_R_SYM (rel
->r_info
);
5442 if (elf_bad_symtab (sec
->owner
))
5444 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5445 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5446 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5449 h
= sym_hashes
[r_symndx
- extsymoff
];
5450 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5453 else if (r_symndx
>= nlocsyms
)
5455 h
= sym_hashes
[r_symndx
- extsymoff
];
5456 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5460 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5461 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5464 if (rsec
&& !rsec
->gc_mark
)
5465 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5473 if (!info
->keep_memory
)
5483 /* The sweep phase of garbage collection. Remove all garbage sections. */
5486 elf_gc_sweep (info
, gc_sweep_hook
)
5487 struct bfd_link_info
*info
;
5488 boolean (*gc_sweep_hook
)
5489 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5490 const Elf_Internal_Rela
*relocs
));
5494 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5498 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5500 /* Keep special sections. Keep .debug sections. */
5501 if ((o
->flags
& SEC_LINKER_CREATED
)
5502 || (o
->flags
& SEC_DEBUGGING
))
5508 /* Skip sweeping sections already excluded. */
5509 if (o
->flags
& SEC_EXCLUDE
)
5512 /* Since this is early in the link process, it is simple
5513 to remove a section from the output. */
5514 o
->flags
|= SEC_EXCLUDE
;
5516 /* But we also have to update some of the relocation
5517 info we collected before. */
5519 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5521 Elf_Internal_Rela
*internal_relocs
;
5524 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5525 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5526 if (internal_relocs
== NULL
)
5529 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5531 if (!info
->keep_memory
)
5532 free (internal_relocs
);
5540 /* Remove the symbols that were in the swept sections from the dynamic
5541 symbol table. GCFIXME: Anyone know how to get them out of the
5542 static symbol table as well? */
5546 elf_link_hash_traverse (elf_hash_table (info
),
5547 elf_gc_sweep_symbol
,
5550 elf_hash_table (info
)->dynsymcount
= i
;
5556 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5559 elf_gc_sweep_symbol (h
, idxptr
)
5560 struct elf_link_hash_entry
*h
;
5563 int *idx
= (int *) idxptr
;
5565 if (h
->dynindx
!= -1
5566 && ((h
->root
.type
!= bfd_link_hash_defined
5567 && h
->root
.type
!= bfd_link_hash_defweak
)
5568 || h
->root
.u
.def
.section
->gc_mark
))
5569 h
->dynindx
= (*idx
)++;
5574 /* Propogate collected vtable information. This is called through
5575 elf_link_hash_traverse. */
5578 elf_gc_propagate_vtable_entries_used (h
, okp
)
5579 struct elf_link_hash_entry
*h
;
5582 /* Those that are not vtables. */
5583 if (h
->vtable_parent
== NULL
)
5586 /* Those vtables that do not have parents, we cannot merge. */
5587 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5590 /* If we've already been done, exit. */
5591 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5594 /* Make sure the parent's table is up to date. */
5595 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5597 if (h
->vtable_entries_used
== NULL
)
5599 /* None of this table's entries were referenced. Re-use the
5601 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5608 /* Or the parent's entries into ours. */
5609 cu
= h
->vtable_entries_used
;
5611 pu
= h
->vtable_parent
->vtable_entries_used
;
5614 n
= h
->vtable_parent
->size
/ FILE_ALIGN
;
5617 if (*pu
) *cu
= true;
5627 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5628 struct elf_link_hash_entry
*h
;
5632 bfd_vma hstart
, hend
;
5633 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5635 /* Take care of both those symbols that do not describe vtables as
5636 well as those that are not loaded. */
5637 if (h
->vtable_parent
== NULL
)
5640 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5641 || h
->root
.type
== bfd_link_hash_defweak
);
5643 sec
= h
->root
.u
.def
.section
;
5644 hstart
= h
->root
.u
.def
.value
;
5645 hend
= hstart
+ h
->size
;
5647 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5648 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5650 return *(boolean
*)okp
= false;
5651 relend
= relstart
+ sec
->reloc_count
;
5653 for (rel
= relstart
; rel
< relend
; ++rel
)
5654 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5656 /* If the entry is in use, do nothing. */
5657 if (h
->vtable_entries_used
)
5659 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5660 if (h
->vtable_entries_used
[entry
])
5663 /* Otherwise, kill it. */
5664 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5670 /* Do mark and sweep of unused sections. */
5673 elf_gc_sections (abfd
, info
)
5675 struct bfd_link_info
*info
;
5679 asection
* (*gc_mark_hook
)
5680 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5681 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5683 if (!get_elf_backend_data (abfd
)->can_gc_sections
5684 || info
->relocateable
)
5687 /* Apply transitive closure to the vtable entry usage info. */
5688 elf_link_hash_traverse (elf_hash_table (info
),
5689 elf_gc_propagate_vtable_entries_used
,
5694 /* Kill the vtable relocations that were not used. */
5695 elf_link_hash_traverse (elf_hash_table (info
),
5696 elf_gc_smash_unused_vtentry_relocs
,
5701 /* Grovel through relocs to find out who stays ... */
5703 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5704 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5707 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5709 if (o
->flags
& SEC_KEEP
)
5710 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5715 /* ... and mark SEC_EXCLUDE for those that go. */
5716 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5722 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5725 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5728 struct elf_link_hash_entry
*h
;
5731 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5732 struct elf_link_hash_entry
**search
, *child
;
5733 bfd_size_type extsymcount
;
5735 /* The sh_info field of the symtab header tells us where the
5736 external symbols start. We don't care about the local symbols at
5738 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5739 if (!elf_bad_symtab (abfd
))
5740 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5742 sym_hashes
= elf_sym_hashes (abfd
);
5743 sym_hashes_end
= sym_hashes
+ extsymcount
;
5745 /* Hunt down the child symbol, which is in this section at the same
5746 offset as the relocation. */
5747 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5749 if ((child
= *search
) != NULL
5750 && (child
->root
.type
== bfd_link_hash_defined
5751 || child
->root
.type
== bfd_link_hash_defweak
)
5752 && child
->root
.u
.def
.section
== sec
5753 && child
->root
.u
.def
.value
== offset
)
5757 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5758 bfd_get_filename (abfd
), sec
->name
,
5759 (unsigned long)offset
);
5760 bfd_set_error (bfd_error_invalid_operation
);
5766 /* This *should* only be the absolute section. It could potentially
5767 be that someone has defined a non-global vtable though, which
5768 would be bad. It isn't worth paging in the local symbols to be
5769 sure though; that case should simply be handled by the assembler. */
5771 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
5774 child
->vtable_parent
= h
;
5779 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
5782 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
5785 struct elf_link_hash_entry
*h
;
5788 if (h
->vtable_entries_used
== NULL
)
5790 /* Allocate one extra entry for use as a "done" flag for the
5791 consolidation pass. */
5792 size_t size
= (h
->size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
5793 h
->vtable_entries_used
= (boolean
*) bfd_alloc (abfd
, size
);
5794 if (h
->vtable_entries_used
== NULL
)
5797 /* And arrange for that done flag to be at index -1. */
5798 memset (h
->vtable_entries_used
++, 0, size
);
5800 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
5805 /* And an accompanying bit to work out final got entry offsets once
5806 we're done. Should be called from final_link. */
5809 elf_gc_common_finalize_got_offsets (abfd
, info
)
5811 struct bfd_link_info
*info
;
5814 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
5817 /* The GOT offset is relative to the .got section, but the GOT header is
5818 put into the .got.plt section, if the backend uses it. */
5819 if (bed
->want_got_plt
)
5822 gotoff
= bed
->got_header_size
;
5824 /* Do the local .got entries first. */
5825 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
5827 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
5828 bfd_size_type j
, locsymcount
;
5829 Elf_Internal_Shdr
*symtab_hdr
;
5834 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
5835 if (elf_bad_symtab (i
))
5836 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5838 locsymcount
= symtab_hdr
->sh_info
;
5840 for (j
= 0; j
< locsymcount
; ++j
)
5842 if (local_got
[j
] > 0)
5844 local_got
[j
] = gotoff
;
5845 gotoff
+= ARCH_SIZE
/ 8;
5848 local_got
[j
] = (bfd_vma
) -1;
5852 /* Then the global .got and .plt entries. */
5853 elf_link_hash_traverse (elf_hash_table (info
),
5854 elf_gc_allocate_got_offsets
,
5859 /* We need a special top-level link routine to convert got reference counts
5860 to real got offsets. */
5863 elf_gc_allocate_got_offsets (h
, offarg
)
5864 struct elf_link_hash_entry
*h
;
5867 bfd_vma
*off
= (bfd_vma
*) offarg
;
5869 if (h
->got
.refcount
> 0)
5871 h
->got
.offset
= off
[0];
5872 off
[0] += ARCH_SIZE
/ 8;
5875 h
->got
.offset
= (bfd_vma
) -1;
5880 /* Many folk need no more in the way of final link than this, once
5881 got entry reference counting is enabled. */
5884 elf_gc_common_final_link (abfd
, info
)
5886 struct bfd_link_info
*info
;
5888 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
5891 /* Invoke the regular ELF backend linker to do all the work. */
5892 return elf_bfd_final_link (abfd
, info
);