2 Copyright 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_collect_hash_codes
54 PARAMS ((struct elf_link_hash_entry
*, PTR
));
55 static boolean elf_link_read_relocs_from_section
56 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
57 static void elf_link_remove_section_and_adjust_dynindices
58 PARAMS ((struct bfd_link_info
*, asection
*));
60 /* Given an ELF BFD, add symbols to the global hash table as
64 elf_bfd_link_add_symbols (abfd
, info
)
66 struct bfd_link_info
*info
;
68 switch (bfd_get_format (abfd
))
71 return elf_link_add_object_symbols (abfd
, info
);
73 return elf_link_add_archive_symbols (abfd
, info
);
75 bfd_set_error (bfd_error_wrong_format
);
81 /* Add symbols from an ELF archive file to the linker hash table. We
82 don't use _bfd_generic_link_add_archive_symbols because of a
83 problem which arises on UnixWare. The UnixWare libc.so is an
84 archive which includes an entry libc.so.1 which defines a bunch of
85 symbols. The libc.so archive also includes a number of other
86 object files, which also define symbols, some of which are the same
87 as those defined in libc.so.1. Correct linking requires that we
88 consider each object file in turn, and include it if it defines any
89 symbols we need. _bfd_generic_link_add_archive_symbols does not do
90 this; it looks through the list of undefined symbols, and includes
91 any object file which defines them. When this algorithm is used on
92 UnixWare, it winds up pulling in libc.so.1 early and defining a
93 bunch of symbols. This means that some of the other objects in the
94 archive are not included in the link, which is incorrect since they
95 precede libc.so.1 in the archive.
97 Fortunately, ELF archive handling is simpler than that done by
98 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
99 oddities. In ELF, if we find a symbol in the archive map, and the
100 symbol is currently undefined, we know that we must pull in that
103 Unfortunately, we do have to make multiple passes over the symbol
104 table until nothing further is resolved. */
107 elf_link_add_archive_symbols (abfd
, info
)
109 struct bfd_link_info
*info
;
112 boolean
*defined
= NULL
;
113 boolean
*included
= NULL
;
117 if (! bfd_has_map (abfd
))
119 /* An empty archive is a special case. */
120 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
122 bfd_set_error (bfd_error_no_armap
);
126 /* Keep track of all symbols we know to be already defined, and all
127 files we know to be already included. This is to speed up the
128 second and subsequent passes. */
129 c
= bfd_ardata (abfd
)->symdef_count
;
132 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
133 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
134 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
136 memset (defined
, 0, c
* sizeof (boolean
));
137 memset (included
, 0, c
* sizeof (boolean
));
139 symdefs
= bfd_ardata (abfd
)->symdefs
;
152 symdefend
= symdef
+ c
;
153 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
155 struct elf_link_hash_entry
*h
;
157 struct bfd_link_hash_entry
*undefs_tail
;
160 if (defined
[i
] || included
[i
])
162 if (symdef
->file_offset
== last
)
168 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
169 false, false, false);
175 /* If this is a default version (the name contains @@),
176 look up the symbol again without the version. The
177 effect is that references to the symbol without the
178 version will be matched by the default symbol in the
181 p
= strchr (symdef
->name
, ELF_VER_CHR
);
182 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
185 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
188 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
189 copy
[p
- symdef
->name
] = '\0';
191 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
192 false, false, false);
194 bfd_release (abfd
, copy
);
200 if (h
->root
.type
!= bfd_link_hash_undefined
)
202 if (h
->root
.type
!= bfd_link_hash_undefweak
)
207 /* We need to include this archive member. */
209 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
210 if (element
== (bfd
*) NULL
)
213 if (! bfd_check_format (element
, bfd_object
))
216 /* Doublecheck that we have not included this object
217 already--it should be impossible, but there may be
218 something wrong with the archive. */
219 if (element
->archive_pass
!= 0)
221 bfd_set_error (bfd_error_bad_value
);
224 element
->archive_pass
= 1;
226 undefs_tail
= info
->hash
->undefs_tail
;
228 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
231 if (! elf_link_add_object_symbols (element
, info
))
234 /* If there are any new undefined symbols, we need to make
235 another pass through the archive in order to see whether
236 they can be defined. FIXME: This isn't perfect, because
237 common symbols wind up on undefs_tail and because an
238 undefined symbol which is defined later on in this pass
239 does not require another pass. This isn't a bug, but it
240 does make the code less efficient than it could be. */
241 if (undefs_tail
!= info
->hash
->undefs_tail
)
244 /* Look backward to mark all symbols from this object file
245 which we have already seen in this pass. */
249 included
[mark
] = true;
254 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
256 /* We mark subsequent symbols from this object file as we go
257 on through the loop. */
258 last
= symdef
->file_offset
;
269 if (defined
!= (boolean
*) NULL
)
271 if (included
!= (boolean
*) NULL
)
276 /* This function is called when we want to define a new symbol. It
277 handles the various cases which arise when we find a definition in
278 a dynamic object, or when there is already a definition in a
279 dynamic object. The new symbol is described by NAME, SYM, PSEC,
280 and PVALUE. We set SYM_HASH to the hash table entry. We set
281 OVERRIDE if the old symbol is overriding a new definition. We set
282 TYPE_CHANGE_OK if it is OK for the type to change. We set
283 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
284 change, we mean that we shouldn't warn if the type or size does
288 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
289 override
, type_change_ok
, size_change_ok
)
291 struct bfd_link_info
*info
;
293 Elf_Internal_Sym
*sym
;
296 struct elf_link_hash_entry
**sym_hash
;
298 boolean
*type_change_ok
;
299 boolean
*size_change_ok
;
302 struct elf_link_hash_entry
*h
;
305 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
310 bind
= ELF_ST_BIND (sym
->st_info
);
312 if (! bfd_is_und_section (sec
))
313 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
315 h
= ((struct elf_link_hash_entry
*)
316 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
321 /* This code is for coping with dynamic objects, and is only useful
322 if we are doing an ELF link. */
323 if (info
->hash
->creator
!= abfd
->xvec
)
326 /* For merging, we only care about real symbols. */
328 while (h
->root
.type
== bfd_link_hash_indirect
329 || h
->root
.type
== bfd_link_hash_warning
)
330 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
332 /* If we just created the symbol, mark it as being an ELF symbol.
333 Other than that, there is nothing to do--there is no merge issue
334 with a newly defined symbol--so we just return. */
336 if (h
->root
.type
== bfd_link_hash_new
)
338 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
342 /* OLDBFD is a BFD associated with the existing symbol. */
344 switch (h
->root
.type
)
350 case bfd_link_hash_undefined
:
351 case bfd_link_hash_undefweak
:
352 oldbfd
= h
->root
.u
.undef
.abfd
;
355 case bfd_link_hash_defined
:
356 case bfd_link_hash_defweak
:
357 oldbfd
= h
->root
.u
.def
.section
->owner
;
360 case bfd_link_hash_common
:
361 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
365 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
366 respectively, is from a dynamic object. */
368 if ((abfd
->flags
& DYNAMIC
) != 0)
373 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
378 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
379 respectively, appear to be a definition rather than reference. */
381 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
386 if (h
->root
.type
== bfd_link_hash_undefined
387 || h
->root
.type
== bfd_link_hash_undefweak
388 || h
->root
.type
== bfd_link_hash_common
)
393 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
394 symbol, respectively, appears to be a common symbol in a dynamic
395 object. If a symbol appears in an uninitialized section, and is
396 not weak, and is not a function, then it may be a common symbol
397 which was resolved when the dynamic object was created. We want
398 to treat such symbols specially, because they raise special
399 considerations when setting the symbol size: if the symbol
400 appears as a common symbol in a regular object, and the size in
401 the regular object is larger, we must make sure that we use the
402 larger size. This problematic case can always be avoided in C,
403 but it must be handled correctly when using Fortran shared
406 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
407 likewise for OLDDYNCOMMON and OLDDEF.
409 Note that this test is just a heuristic, and that it is quite
410 possible to have an uninitialized symbol in a shared object which
411 is really a definition, rather than a common symbol. This could
412 lead to some minor confusion when the symbol really is a common
413 symbol in some regular object. However, I think it will be
418 && (sec
->flags
& SEC_ALLOC
) != 0
419 && (sec
->flags
& SEC_LOAD
) == 0
422 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
425 newdyncommon
= false;
429 && h
->root
.type
== bfd_link_hash_defined
430 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
431 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
432 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
434 && h
->type
!= STT_FUNC
)
437 olddyncommon
= false;
439 /* It's OK to change the type if either the existing symbol or the
440 new symbol is weak. */
442 if (h
->root
.type
== bfd_link_hash_defweak
443 || h
->root
.type
== bfd_link_hash_undefweak
445 *type_change_ok
= true;
447 /* It's OK to change the size if either the existing symbol or the
448 new symbol is weak, or if the old symbol is undefined. */
451 || h
->root
.type
== bfd_link_hash_undefined
)
452 *size_change_ok
= true;
454 /* If both the old and the new symbols look like common symbols in a
455 dynamic object, set the size of the symbol to the larger of the
460 && sym
->st_size
!= h
->size
)
462 /* Since we think we have two common symbols, issue a multiple
463 common warning if desired. Note that we only warn if the
464 size is different. If the size is the same, we simply let
465 the old symbol override the new one as normally happens with
466 symbols defined in dynamic objects. */
468 if (! ((*info
->callbacks
->multiple_common
)
469 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
470 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
473 if (sym
->st_size
> h
->size
)
474 h
->size
= sym
->st_size
;
476 *size_change_ok
= true;
479 /* If we are looking at a dynamic object, and we have found a
480 definition, we need to see if the symbol was already defined by
481 some other object. If so, we want to use the existing
482 definition, and we do not want to report a multiple symbol
483 definition error; we do this by clobbering *PSEC to be
486 We treat a common symbol as a definition if the symbol in the
487 shared library is a function, since common symbols always
488 represent variables; this can cause confusion in principle, but
489 any such confusion would seem to indicate an erroneous program or
490 shared library. We also permit a common symbol in a regular
491 object to override a weak symbol in a shared object. */
496 || (h
->root
.type
== bfd_link_hash_common
498 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
502 newdyncommon
= false;
504 *psec
= sec
= bfd_und_section_ptr
;
505 *size_change_ok
= true;
507 /* If we get here when the old symbol is a common symbol, then
508 we are explicitly letting it override a weak symbol or
509 function in a dynamic object, and we don't want to warn about
510 a type change. If the old symbol is a defined symbol, a type
511 change warning may still be appropriate. */
513 if (h
->root
.type
== bfd_link_hash_common
)
514 *type_change_ok
= true;
517 /* Handle the special case of an old common symbol merging with a
518 new symbol which looks like a common symbol in a shared object.
519 We change *PSEC and *PVALUE to make the new symbol look like a
520 common symbol, and let _bfd_generic_link_add_one_symbol will do
524 && h
->root
.type
== bfd_link_hash_common
)
528 newdyncommon
= false;
529 *pvalue
= sym
->st_size
;
530 *psec
= sec
= bfd_com_section_ptr
;
531 *size_change_ok
= true;
534 /* If the old symbol is from a dynamic object, and the new symbol is
535 a definition which is not from a dynamic object, then the new
536 symbol overrides the old symbol. Symbols from regular files
537 always take precedence over symbols from dynamic objects, even if
538 they are defined after the dynamic object in the link.
540 As above, we again permit a common symbol in a regular object to
541 override a definition in a shared object if the shared object
542 symbol is a function or is weak. */
546 || (bfd_is_com_section (sec
)
547 && (h
->root
.type
== bfd_link_hash_defweak
548 || h
->type
== STT_FUNC
)))
551 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
553 /* Change the hash table entry to undefined, and let
554 _bfd_generic_link_add_one_symbol do the right thing with the
557 h
->root
.type
= bfd_link_hash_undefined
;
558 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
559 *size_change_ok
= true;
562 olddyncommon
= false;
564 /* We again permit a type change when a common symbol may be
565 overriding a function. */
567 if (bfd_is_com_section (sec
))
568 *type_change_ok
= true;
570 /* This union may have been set to be non-NULL when this symbol
571 was seen in a dynamic object. We must force the union to be
572 NULL, so that it is correct for a regular symbol. */
574 h
->verinfo
.vertree
= NULL
;
576 /* In this special case, if H is the target of an indirection,
577 we want the caller to frob with H rather than with the
578 indirect symbol. That will permit the caller to redefine the
579 target of the indirection, rather than the indirect symbol
580 itself. FIXME: This will break the -y option if we store a
581 symbol with a different name. */
585 /* Handle the special case of a new common symbol merging with an
586 old symbol that looks like it might be a common symbol defined in
587 a shared object. Note that we have already handled the case in
588 which a new common symbol should simply override the definition
589 in the shared library. */
592 && bfd_is_com_section (sec
)
595 /* It would be best if we could set the hash table entry to a
596 common symbol, but we don't know what to use for the section
598 if (! ((*info
->callbacks
->multiple_common
)
599 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
600 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
603 /* If the predumed common symbol in the dynamic object is
604 larger, pretend that the new symbol has its size. */
606 if (h
->size
> *pvalue
)
609 /* FIXME: We no longer know the alignment required by the symbol
610 in the dynamic object, so we just wind up using the one from
611 the regular object. */
614 olddyncommon
= false;
616 h
->root
.type
= bfd_link_hash_undefined
;
617 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
619 *size_change_ok
= true;
620 *type_change_ok
= true;
622 h
->verinfo
.vertree
= NULL
;
628 /* Add symbols from an ELF object file to the linker hash table. */
631 elf_link_add_object_symbols (abfd
, info
)
633 struct bfd_link_info
*info
;
635 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 const Elf_Internal_Sym
*,
637 const char **, flagword
*,
638 asection
**, bfd_vma
*));
639 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
640 asection
*, const Elf_Internal_Rela
*));
642 Elf_Internal_Shdr
*hdr
;
646 Elf_External_Sym
*buf
= NULL
;
647 struct elf_link_hash_entry
**sym_hash
;
649 bfd_byte
*dynver
= NULL
;
650 Elf_External_Versym
*extversym
= NULL
;
651 Elf_External_Versym
*ever
;
652 Elf_External_Dyn
*dynbuf
= NULL
;
653 struct elf_link_hash_entry
*weaks
;
654 Elf_External_Sym
*esym
;
655 Elf_External_Sym
*esymend
;
657 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
658 collect
= get_elf_backend_data (abfd
)->collect
;
660 if ((abfd
->flags
& DYNAMIC
) == 0)
666 /* You can't use -r against a dynamic object. Also, there's no
667 hope of using a dynamic object which does not exactly match
668 the format of the output file. */
669 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
671 bfd_set_error (bfd_error_invalid_operation
);
676 /* As a GNU extension, any input sections which are named
677 .gnu.warning.SYMBOL are treated as warning symbols for the given
678 symbol. This differs from .gnu.warning sections, which generate
679 warnings when they are included in an output file. */
684 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
688 name
= bfd_get_section_name (abfd
, s
);
689 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
694 name
+= sizeof ".gnu.warning." - 1;
696 /* If this is a shared object, then look up the symbol
697 in the hash table. If it is there, and it is already
698 been defined, then we will not be using the entry
699 from this shared object, so we don't need to warn.
700 FIXME: If we see the definition in a regular object
701 later on, we will warn, but we shouldn't. The only
702 fix is to keep track of what warnings we are supposed
703 to emit, and then handle them all at the end of the
705 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
707 struct elf_link_hash_entry
*h
;
709 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
712 /* FIXME: What about bfd_link_hash_common? */
714 && (h
->root
.type
== bfd_link_hash_defined
715 || h
->root
.type
== bfd_link_hash_defweak
))
717 /* We don't want to issue this warning. Clobber
718 the section size so that the warning does not
719 get copied into the output file. */
725 sz
= bfd_section_size (abfd
, s
);
726 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
730 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
735 if (! (_bfd_generic_link_add_one_symbol
736 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
737 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
740 if (! info
->relocateable
)
742 /* Clobber the section size so that the warning does
743 not get copied into the output file. */
750 /* If this is a dynamic object, we always link against the .dynsym
751 symbol table, not the .symtab symbol table. The dynamic linker
752 will only see the .dynsym symbol table, so there is no reason to
753 look at .symtab for a dynamic object. */
755 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
756 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
758 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
762 /* Read in any version definitions. */
764 if (! _bfd_elf_slurp_version_tables (abfd
))
767 /* Read in the symbol versions, but don't bother to convert them
768 to internal format. */
769 if (elf_dynversym (abfd
) != 0)
771 Elf_Internal_Shdr
*versymhdr
;
773 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
774 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
775 if (extversym
== NULL
)
777 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
778 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
779 != versymhdr
->sh_size
))
784 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
786 /* The sh_info field of the symtab header tells us where the
787 external symbols start. We don't care about the local symbols at
789 if (elf_bad_symtab (abfd
))
791 extsymcount
= symcount
;
796 extsymcount
= symcount
- hdr
->sh_info
;
797 extsymoff
= hdr
->sh_info
;
800 buf
= ((Elf_External_Sym
*)
801 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
802 if (buf
== NULL
&& extsymcount
!= 0)
805 /* We store a pointer to the hash table entry for each external
807 sym_hash
= ((struct elf_link_hash_entry
**)
809 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
810 if (sym_hash
== NULL
)
812 elf_sym_hashes (abfd
) = sym_hash
;
816 /* If we are creating a shared library, create all the dynamic
817 sections immediately. We need to attach them to something,
818 so we attach them to this BFD, provided it is the right
819 format. FIXME: If there are no input BFD's of the same
820 format as the output, we can't make a shared library. */
822 && ! elf_hash_table (info
)->dynamic_sections_created
823 && abfd
->xvec
== info
->hash
->creator
)
825 if (! elf_link_create_dynamic_sections (abfd
, info
))
834 bfd_size_type oldsize
;
835 bfd_size_type strindex
;
837 /* Find the name to use in a DT_NEEDED entry that refers to this
838 object. If the object has a DT_SONAME entry, we use it.
839 Otherwise, if the generic linker stuck something in
840 elf_dt_name, we use that. Otherwise, we just use the file
841 name. If the generic linker put a null string into
842 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
843 there is a DT_SONAME entry. */
845 name
= bfd_get_filename (abfd
);
846 if (elf_dt_name (abfd
) != NULL
)
848 name
= elf_dt_name (abfd
);
852 s
= bfd_get_section_by_name (abfd
, ".dynamic");
855 Elf_External_Dyn
*extdyn
;
856 Elf_External_Dyn
*extdynend
;
860 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
864 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
865 (file_ptr
) 0, s
->_raw_size
))
868 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
871 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
874 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
875 for (; extdyn
< extdynend
; extdyn
++)
877 Elf_Internal_Dyn dyn
;
879 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
880 if (dyn
.d_tag
== DT_SONAME
)
882 name
= bfd_elf_string_from_elf_section (abfd
, link
,
887 if (dyn
.d_tag
== DT_NEEDED
)
889 struct bfd_link_needed_list
*n
, **pn
;
892 n
= ((struct bfd_link_needed_list
*)
893 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
894 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
896 if (n
== NULL
|| fnm
== NULL
)
898 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
905 for (pn
= &elf_hash_table (info
)->needed
;
917 /* We do not want to include any of the sections in a dynamic
918 object in the output file. We hack by simply clobbering the
919 list of sections in the BFD. This could be handled more
920 cleanly by, say, a new section flag; the existing
921 SEC_NEVER_LOAD flag is not the one we want, because that one
922 still implies that the section takes up space in the output
924 abfd
->sections
= NULL
;
925 abfd
->section_count
= 0;
927 /* If this is the first dynamic object found in the link, create
928 the special sections required for dynamic linking. */
929 if (! elf_hash_table (info
)->dynamic_sections_created
)
931 if (! elf_link_create_dynamic_sections (abfd
, info
))
937 /* Add a DT_NEEDED entry for this dynamic object. */
938 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
939 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
941 if (strindex
== (bfd_size_type
) -1)
944 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
947 Elf_External_Dyn
*dyncon
, *dynconend
;
949 /* The hash table size did not change, which means that
950 the dynamic object name was already entered. If we
951 have already included this dynamic object in the
952 link, just ignore it. There is no reason to include
953 a particular dynamic object more than once. */
954 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
956 BFD_ASSERT (sdyn
!= NULL
);
958 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
959 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
961 for (; dyncon
< dynconend
; dyncon
++)
963 Elf_Internal_Dyn dyn
;
965 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
967 if (dyn
.d_tag
== DT_NEEDED
968 && dyn
.d_un
.d_val
== strindex
)
972 if (extversym
!= NULL
)
979 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
983 /* Save the SONAME, if there is one, because sometimes the
984 linker emulation code will need to know it. */
986 name
= bfd_get_filename (abfd
);
987 elf_dt_name (abfd
) = name
;
991 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
993 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
994 != extsymcount
* sizeof (Elf_External_Sym
)))
999 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1000 esymend
= buf
+ extsymcount
;
1003 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1005 Elf_Internal_Sym sym
;
1011 struct elf_link_hash_entry
*h
;
1013 boolean size_change_ok
, type_change_ok
;
1014 boolean new_weakdef
;
1015 unsigned int old_alignment
;
1017 elf_swap_symbol_in (abfd
, esym
, &sym
);
1019 flags
= BSF_NO_FLAGS
;
1021 value
= sym
.st_value
;
1024 bind
= ELF_ST_BIND (sym
.st_info
);
1025 if (bind
== STB_LOCAL
)
1027 /* This should be impossible, since ELF requires that all
1028 global symbols follow all local symbols, and that sh_info
1029 point to the first global symbol. Unfortunatealy, Irix 5
1033 else if (bind
== STB_GLOBAL
)
1035 if (sym
.st_shndx
!= SHN_UNDEF
1036 && sym
.st_shndx
!= SHN_COMMON
)
1041 else if (bind
== STB_WEAK
)
1045 /* Leave it up to the processor backend. */
1048 if (sym
.st_shndx
== SHN_UNDEF
)
1049 sec
= bfd_und_section_ptr
;
1050 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1052 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1054 sec
= bfd_abs_section_ptr
;
1055 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1058 else if (sym
.st_shndx
== SHN_ABS
)
1059 sec
= bfd_abs_section_ptr
;
1060 else if (sym
.st_shndx
== SHN_COMMON
)
1062 sec
= bfd_com_section_ptr
;
1063 /* What ELF calls the size we call the value. What ELF
1064 calls the value we call the alignment. */
1065 value
= sym
.st_size
;
1069 /* Leave it up to the processor backend. */
1072 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1073 if (name
== (const char *) NULL
)
1076 if (add_symbol_hook
)
1078 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1082 /* The hook function sets the name to NULL if this symbol
1083 should be skipped for some reason. */
1084 if (name
== (const char *) NULL
)
1088 /* Sanity check that all possibilities were handled. */
1089 if (sec
== (asection
*) NULL
)
1091 bfd_set_error (bfd_error_bad_value
);
1095 if (bfd_is_und_section (sec
)
1096 || bfd_is_com_section (sec
))
1101 size_change_ok
= false;
1102 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1104 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1106 Elf_Internal_Versym iver
;
1107 unsigned int vernum
= 0;
1112 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1113 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1115 /* If this is a hidden symbol, or if it is not version
1116 1, we append the version name to the symbol name.
1117 However, we do not modify a non-hidden absolute
1118 symbol, because it might be the version symbol
1119 itself. FIXME: What if it isn't? */
1120 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1121 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1124 int namelen
, newlen
;
1127 if (sym
.st_shndx
!= SHN_UNDEF
)
1129 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1131 (*_bfd_error_handler
)
1132 (_("%s: %s: invalid version %u (max %d)"),
1133 bfd_get_filename (abfd
), name
, vernum
,
1134 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1135 bfd_set_error (bfd_error_bad_value
);
1138 else if (vernum
> 1)
1140 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1146 /* We cannot simply test for the number of
1147 entries in the VERNEED section since the
1148 numbers for the needed versions do not start
1150 Elf_Internal_Verneed
*t
;
1153 for (t
= elf_tdata (abfd
)->verref
;
1157 Elf_Internal_Vernaux
*a
;
1159 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1161 if (a
->vna_other
== vernum
)
1163 verstr
= a
->vna_nodename
;
1172 (*_bfd_error_handler
)
1173 (_("%s: %s: invalid needed version %d"),
1174 bfd_get_filename (abfd
), name
, vernum
);
1175 bfd_set_error (bfd_error_bad_value
);
1180 namelen
= strlen (name
);
1181 newlen
= namelen
+ strlen (verstr
) + 2;
1182 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1185 newname
= (char *) bfd_alloc (abfd
, newlen
);
1186 if (newname
== NULL
)
1188 strcpy (newname
, name
);
1189 p
= newname
+ namelen
;
1191 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1199 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1200 sym_hash
, &override
, &type_change_ok
,
1208 while (h
->root
.type
== bfd_link_hash_indirect
1209 || h
->root
.type
== bfd_link_hash_warning
)
1210 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1212 /* Remember the old alignment if this is a common symbol, so
1213 that we don't reduce the alignment later on. We can't
1214 check later, because _bfd_generic_link_add_one_symbol
1215 will set a default for the alignment which we want to
1217 if (h
->root
.type
== bfd_link_hash_common
)
1218 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1220 if (elf_tdata (abfd
)->verdef
!= NULL
1224 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1227 if (! (_bfd_generic_link_add_one_symbol
1228 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1229 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1233 while (h
->root
.type
== bfd_link_hash_indirect
1234 || h
->root
.type
== bfd_link_hash_warning
)
1235 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1238 new_weakdef
= false;
1241 && (flags
& BSF_WEAK
) != 0
1242 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1243 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1244 && h
->weakdef
== NULL
)
1246 /* Keep a list of all weak defined non function symbols from
1247 a dynamic object, using the weakdef field. Later in this
1248 function we will set the weakdef field to the correct
1249 value. We only put non-function symbols from dynamic
1250 objects on this list, because that happens to be the only
1251 time we need to know the normal symbol corresponding to a
1252 weak symbol, and the information is time consuming to
1253 figure out. If the weakdef field is not already NULL,
1254 then this symbol was already defined by some previous
1255 dynamic object, and we will be using that previous
1256 definition anyhow. */
1263 /* Set the alignment of a common symbol. */
1264 if (sym
.st_shndx
== SHN_COMMON
1265 && h
->root
.type
== bfd_link_hash_common
)
1269 align
= bfd_log2 (sym
.st_value
);
1270 if (align
> old_alignment
)
1271 h
->root
.u
.c
.p
->alignment_power
= align
;
1274 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1280 /* Remember the symbol size and type. */
1281 if (sym
.st_size
!= 0
1282 && (definition
|| h
->size
== 0))
1284 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1285 (*_bfd_error_handler
)
1286 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1287 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1288 bfd_get_filename (abfd
));
1290 h
->size
= sym
.st_size
;
1293 /* If this is a common symbol, then we always want H->SIZE
1294 to be the size of the common symbol. The code just above
1295 won't fix the size if a common symbol becomes larger. We
1296 don't warn about a size change here, because that is
1297 covered by --warn-common. */
1298 if (h
->root
.type
== bfd_link_hash_common
)
1299 h
->size
= h
->root
.u
.c
.size
;
1301 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1302 && (definition
|| h
->type
== STT_NOTYPE
))
1304 if (h
->type
!= STT_NOTYPE
1305 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1306 && ! type_change_ok
)
1307 (*_bfd_error_handler
)
1308 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1309 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1310 bfd_get_filename (abfd
));
1312 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1315 if (sym
.st_other
!= 0
1316 && (definition
|| h
->other
== 0))
1317 h
->other
= sym
.st_other
;
1319 /* Set a flag in the hash table entry indicating the type of
1320 reference or definition we just found. Keep a count of
1321 the number of dynamic symbols we find. A dynamic symbol
1322 is one which is referenced or defined by both a regular
1323 object and a shared object. */
1324 old_flags
= h
->elf_link_hash_flags
;
1330 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1331 if (bind
!= STB_WEAK
)
1332 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1335 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1337 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1338 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1344 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1346 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1347 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1348 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1349 || (h
->weakdef
!= NULL
1351 && h
->weakdef
->dynindx
!= -1))
1355 h
->elf_link_hash_flags
|= new_flag
;
1357 /* If this symbol has a version, and it is the default
1358 version, we create an indirect symbol from the default
1359 name to the fully decorated name. This will cause
1360 external references which do not specify a version to be
1361 bound to this version of the symbol. */
1366 p
= strchr (name
, ELF_VER_CHR
);
1367 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1370 struct elf_link_hash_entry
*hi
;
1373 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1375 if (shortname
== NULL
)
1377 strncpy (shortname
, name
, p
- name
);
1378 shortname
[p
- name
] = '\0';
1380 /* We are going to create a new symbol. Merge it
1381 with any existing symbol with this name. For the
1382 purposes of the merge, act as though we were
1383 defining the symbol we just defined, although we
1384 actually going to define an indirect symbol. */
1385 type_change_ok
= false;
1386 size_change_ok
= false;
1387 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1388 &value
, &hi
, &override
,
1389 &type_change_ok
, &size_change_ok
))
1394 if (! (_bfd_generic_link_add_one_symbol
1395 (info
, abfd
, shortname
, BSF_INDIRECT
,
1396 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1397 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1402 /* In this case the symbol named SHORTNAME is
1403 overriding the indirect symbol we want to
1404 add. We were planning on making SHORTNAME an
1405 indirect symbol referring to NAME. SHORTNAME
1406 is the name without a version. NAME is the
1407 fully versioned name, and it is the default
1410 Overriding means that we already saw a
1411 definition for the symbol SHORTNAME in a
1412 regular object, and it is overriding the
1413 symbol defined in the dynamic object.
1415 When this happens, we actually want to change
1416 NAME, the symbol we just added, to refer to
1417 SHORTNAME. This will cause references to
1418 NAME in the shared object to become
1419 references to SHORTNAME in the regular
1420 object. This is what we expect when we
1421 override a function in a shared object: that
1422 the references in the shared object will be
1423 mapped to the definition in the regular
1426 while (hi
->root
.type
== bfd_link_hash_indirect
1427 || hi
->root
.type
== bfd_link_hash_warning
)
1428 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1430 h
->root
.type
= bfd_link_hash_indirect
;
1431 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1432 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1434 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1435 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1436 if (hi
->elf_link_hash_flags
1437 & (ELF_LINK_HASH_REF_REGULAR
1438 | ELF_LINK_HASH_DEF_REGULAR
))
1440 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1446 /* Now set HI to H, so that the following code
1447 will set the other fields correctly. */
1451 /* If there is a duplicate definition somewhere,
1452 then HI may not point to an indirect symbol. We
1453 will have reported an error to the user in that
1456 if (hi
->root
.type
== bfd_link_hash_indirect
)
1458 struct elf_link_hash_entry
*ht
;
1460 /* If the symbol became indirect, then we assume
1461 that we have not seen a definition before. */
1462 BFD_ASSERT ((hi
->elf_link_hash_flags
1463 & (ELF_LINK_HASH_DEF_DYNAMIC
1464 | ELF_LINK_HASH_DEF_REGULAR
))
1467 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1469 /* Copy down any references that we may have
1470 already seen to the symbol which just became
1472 ht
->elf_link_hash_flags
|=
1473 (hi
->elf_link_hash_flags
1474 & (ELF_LINK_HASH_REF_DYNAMIC
1475 | ELF_LINK_HASH_REF_REGULAR
1476 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1478 /* Copy over the global and procedure linkage table
1479 offset entries. These may have been already set
1480 up by a check_relocs routine. */
1481 if (ht
->got
.offset
== (bfd_vma
) -1)
1483 ht
->got
.offset
= hi
->got
.offset
;
1484 hi
->got
.offset
= (bfd_vma
) -1;
1486 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1488 if (ht
->plt
.offset
== (bfd_vma
) -1)
1490 ht
->plt
.offset
= hi
->plt
.offset
;
1491 hi
->plt
.offset
= (bfd_vma
) -1;
1493 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1495 if (ht
->dynindx
== -1)
1497 ht
->dynindx
= hi
->dynindx
;
1498 ht
->dynstr_index
= hi
->dynstr_index
;
1500 hi
->dynstr_index
= 0;
1502 BFD_ASSERT (hi
->dynindx
== -1);
1504 /* FIXME: There may be other information to copy
1505 over for particular targets. */
1507 /* See if the new flags lead us to realize that
1508 the symbol must be dynamic. */
1514 || ((hi
->elf_link_hash_flags
1515 & ELF_LINK_HASH_REF_DYNAMIC
)
1521 if ((hi
->elf_link_hash_flags
1522 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1528 /* We also need to define an indirection from the
1529 nondefault version of the symbol. */
1531 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1533 if (shortname
== NULL
)
1535 strncpy (shortname
, name
, p
- name
);
1536 strcpy (shortname
+ (p
- name
), p
+ 1);
1538 /* Once again, merge with any existing symbol. */
1539 type_change_ok
= false;
1540 size_change_ok
= false;
1541 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1542 &value
, &hi
, &override
,
1543 &type_change_ok
, &size_change_ok
))
1548 /* Here SHORTNAME is a versioned name, so we
1549 don't expect to see the type of override we
1550 do in the case above. */
1551 (*_bfd_error_handler
)
1552 (_("%s: warning: unexpected redefinition of `%s'"),
1553 bfd_get_filename (abfd
), shortname
);
1557 if (! (_bfd_generic_link_add_one_symbol
1558 (info
, abfd
, shortname
, BSF_INDIRECT
,
1559 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1560 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1563 /* If there is a duplicate definition somewhere,
1564 then HI may not point to an indirect symbol.
1565 We will have reported an error to the user in
1568 if (hi
->root
.type
== bfd_link_hash_indirect
)
1570 /* If the symbol became indirect, then we
1571 assume that we have not seen a definition
1573 BFD_ASSERT ((hi
->elf_link_hash_flags
1574 & (ELF_LINK_HASH_DEF_DYNAMIC
1575 | ELF_LINK_HASH_DEF_REGULAR
))
1578 /* Copy down any references that we may have
1579 already seen to the symbol which just
1581 h
->elf_link_hash_flags
|=
1582 (hi
->elf_link_hash_flags
1583 & (ELF_LINK_HASH_REF_DYNAMIC
1584 | ELF_LINK_HASH_REF_REGULAR
1585 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1587 /* Copy over the global and procedure linkage
1588 table offset entries. These may have been
1589 already set up by a check_relocs routine. */
1590 if (h
->got
.offset
== (bfd_vma
) -1)
1592 h
->got
.offset
= hi
->got
.offset
;
1593 hi
->got
.offset
= (bfd_vma
) -1;
1595 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1597 if (h
->plt
.offset
== (bfd_vma
) -1)
1599 h
->plt
.offset
= hi
->plt
.offset
;
1600 hi
->plt
.offset
= (bfd_vma
) -1;
1602 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1604 if (h
->dynindx
== -1)
1606 h
->dynindx
= hi
->dynindx
;
1607 h
->dynstr_index
= hi
->dynstr_index
;
1609 hi
->dynstr_index
= 0;
1611 BFD_ASSERT (hi
->dynindx
== -1);
1613 /* FIXME: There may be other information to
1614 copy over for particular targets. */
1616 /* See if the new flags lead us to realize
1617 that the symbol must be dynamic. */
1623 || ((hi
->elf_link_hash_flags
1624 & ELF_LINK_HASH_REF_DYNAMIC
)
1630 if ((hi
->elf_link_hash_flags
1631 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1640 if (dynsym
&& h
->dynindx
== -1)
1642 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1644 if (h
->weakdef
!= NULL
1646 && h
->weakdef
->dynindx
== -1)
1648 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1656 /* Now set the weakdefs field correctly for all the weak defined
1657 symbols we found. The only way to do this is to search all the
1658 symbols. Since we only need the information for non functions in
1659 dynamic objects, that's the only time we actually put anything on
1660 the list WEAKS. We need this information so that if a regular
1661 object refers to a symbol defined weakly in a dynamic object, the
1662 real symbol in the dynamic object is also put in the dynamic
1663 symbols; we also must arrange for both symbols to point to the
1664 same memory location. We could handle the general case of symbol
1665 aliasing, but a general symbol alias can only be generated in
1666 assembler code, handling it correctly would be very time
1667 consuming, and other ELF linkers don't handle general aliasing
1669 while (weaks
!= NULL
)
1671 struct elf_link_hash_entry
*hlook
;
1674 struct elf_link_hash_entry
**hpp
;
1675 struct elf_link_hash_entry
**hppend
;
1678 weaks
= hlook
->weakdef
;
1679 hlook
->weakdef
= NULL
;
1681 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1682 || hlook
->root
.type
== bfd_link_hash_defweak
1683 || hlook
->root
.type
== bfd_link_hash_common
1684 || hlook
->root
.type
== bfd_link_hash_indirect
);
1685 slook
= hlook
->root
.u
.def
.section
;
1686 vlook
= hlook
->root
.u
.def
.value
;
1688 hpp
= elf_sym_hashes (abfd
);
1689 hppend
= hpp
+ extsymcount
;
1690 for (; hpp
< hppend
; hpp
++)
1692 struct elf_link_hash_entry
*h
;
1695 if (h
!= NULL
&& h
!= hlook
1696 && h
->root
.type
== bfd_link_hash_defined
1697 && h
->root
.u
.def
.section
== slook
1698 && h
->root
.u
.def
.value
== vlook
)
1702 /* If the weak definition is in the list of dynamic
1703 symbols, make sure the real definition is put there
1705 if (hlook
->dynindx
!= -1
1706 && h
->dynindx
== -1)
1708 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1712 /* If the real definition is in the list of dynamic
1713 symbols, make sure the weak definition is put there
1714 as well. If we don't do this, then the dynamic
1715 loader might not merge the entries for the real
1716 definition and the weak definition. */
1717 if (h
->dynindx
!= -1
1718 && hlook
->dynindx
== -1)
1720 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1735 if (extversym
!= NULL
)
1741 /* If this object is the same format as the output object, and it is
1742 not a shared library, then let the backend look through the
1745 This is required to build global offset table entries and to
1746 arrange for dynamic relocs. It is not required for the
1747 particular common case of linking non PIC code, even when linking
1748 against shared libraries, but unfortunately there is no way of
1749 knowing whether an object file has been compiled PIC or not.
1750 Looking through the relocs is not particularly time consuming.
1751 The problem is that we must either (1) keep the relocs in memory,
1752 which causes the linker to require additional runtime memory or
1753 (2) read the relocs twice from the input file, which wastes time.
1754 This would be a good case for using mmap.
1756 I have no idea how to handle linking PIC code into a file of a
1757 different format. It probably can't be done. */
1758 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1760 && abfd
->xvec
== info
->hash
->creator
1761 && check_relocs
!= NULL
)
1765 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1767 Elf_Internal_Rela
*internal_relocs
;
1770 if ((o
->flags
& SEC_RELOC
) == 0
1771 || o
->reloc_count
== 0
1772 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1773 && (o
->flags
& SEC_DEBUGGING
) != 0)
1774 || bfd_is_abs_section (o
->output_section
))
1777 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1778 (abfd
, o
, (PTR
) NULL
,
1779 (Elf_Internal_Rela
*) NULL
,
1780 info
->keep_memory
));
1781 if (internal_relocs
== NULL
)
1784 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1786 if (! info
->keep_memory
)
1787 free (internal_relocs
);
1794 /* If this is a non-traditional, non-relocateable link, try to
1795 optimize the handling of the .stab/.stabstr sections. */
1797 && ! info
->relocateable
1798 && ! info
->traditional_format
1799 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1800 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1802 asection
*stab
, *stabstr
;
1804 stab
= bfd_get_section_by_name (abfd
, ".stab");
1807 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1809 if (stabstr
!= NULL
)
1811 struct bfd_elf_section_data
*secdata
;
1813 secdata
= elf_section_data (stab
);
1814 if (! _bfd_link_section_stabs (abfd
,
1815 &elf_hash_table (info
)->stab_info
,
1817 &secdata
->stab_info
))
1832 if (extversym
!= NULL
)
1837 /* Create some sections which will be filled in with dynamic linking
1838 information. ABFD is an input file which requires dynamic sections
1839 to be created. The dynamic sections take up virtual memory space
1840 when the final executable is run, so we need to create them before
1841 addresses are assigned to the output sections. We work out the
1842 actual contents and size of these sections later. */
1845 elf_link_create_dynamic_sections (abfd
, info
)
1847 struct bfd_link_info
*info
;
1850 register asection
*s
;
1851 struct elf_link_hash_entry
*h
;
1852 struct elf_backend_data
*bed
;
1854 if (elf_hash_table (info
)->dynamic_sections_created
)
1857 /* Make sure that all dynamic sections use the same input BFD. */
1858 if (elf_hash_table (info
)->dynobj
== NULL
)
1859 elf_hash_table (info
)->dynobj
= abfd
;
1861 abfd
= elf_hash_table (info
)->dynobj
;
1863 /* Note that we set the SEC_IN_MEMORY flag for all of these
1865 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1866 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1868 /* A dynamically linked executable has a .interp section, but a
1869 shared library does not. */
1872 s
= bfd_make_section (abfd
, ".interp");
1874 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1878 /* Create sections to hold version informations. These are removed
1879 if they are not needed. */
1880 s
= bfd_make_section (abfd
, ".gnu.version_d");
1882 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1883 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1886 s
= bfd_make_section (abfd
, ".gnu.version");
1888 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1889 || ! bfd_set_section_alignment (abfd
, s
, 1))
1892 s
= bfd_make_section (abfd
, ".gnu.version_r");
1894 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1895 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1898 s
= bfd_make_section (abfd
, ".dynsym");
1900 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1901 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1904 s
= bfd_make_section (abfd
, ".dynstr");
1906 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1909 /* Create a strtab to hold the dynamic symbol names. */
1910 if (elf_hash_table (info
)->dynstr
== NULL
)
1912 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1913 if (elf_hash_table (info
)->dynstr
== NULL
)
1917 s
= bfd_make_section (abfd
, ".dynamic");
1919 || ! bfd_set_section_flags (abfd
, s
, flags
)
1920 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1923 /* The special symbol _DYNAMIC is always set to the start of the
1924 .dynamic section. This call occurs before we have processed the
1925 symbols for any dynamic object, so we don't have to worry about
1926 overriding a dynamic definition. We could set _DYNAMIC in a
1927 linker script, but we only want to define it if we are, in fact,
1928 creating a .dynamic section. We don't want to define it if there
1929 is no .dynamic section, since on some ELF platforms the start up
1930 code examines it to decide how to initialize the process. */
1932 if (! (_bfd_generic_link_add_one_symbol
1933 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1934 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1935 (struct bfd_link_hash_entry
**) &h
)))
1937 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1938 h
->type
= STT_OBJECT
;
1941 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1944 s
= bfd_make_section (abfd
, ".hash");
1946 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1947 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1950 /* Let the backend create the rest of the sections. This lets the
1951 backend set the right flags. The backend will normally create
1952 the .got and .plt sections. */
1953 bed
= get_elf_backend_data (abfd
);
1954 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1957 elf_hash_table (info
)->dynamic_sections_created
= true;
1962 /* Add an entry to the .dynamic table. */
1965 elf_add_dynamic_entry (info
, tag
, val
)
1966 struct bfd_link_info
*info
;
1970 Elf_Internal_Dyn dyn
;
1974 bfd_byte
*newcontents
;
1976 dynobj
= elf_hash_table (info
)->dynobj
;
1978 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1979 BFD_ASSERT (s
!= NULL
);
1981 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1982 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1983 if (newcontents
== NULL
)
1987 dyn
.d_un
.d_val
= val
;
1988 elf_swap_dyn_out (dynobj
, &dyn
,
1989 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1991 s
->_raw_size
= newsize
;
1992 s
->contents
= newcontents
;
1998 /* Read and swap the relocs from the section indicated by SHDR. This
1999 may be either a REL or a RELA section. The relocations are
2000 translated into RELA relocations and stored in INTERNAL_RELOCS,
2001 which should have already been allocated to contain enough space.
2002 The EXTERNAL_RELOCS are a buffer where the external form of the
2003 relocations should be stored.
2005 Returns false if something goes wrong. */
2008 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2011 Elf_Internal_Shdr
*shdr
;
2012 PTR external_relocs
;
2013 Elf_Internal_Rela
*internal_relocs
;
2015 /* If there aren't any relocations, that's OK. */
2019 /* Position ourselves at the start of the section. */
2020 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2023 /* Read the relocations. */
2024 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2028 /* Convert the external relocations to the internal format. */
2029 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2031 Elf_External_Rel
*erel
;
2032 Elf_External_Rel
*erelend
;
2033 Elf_Internal_Rela
*irela
;
2035 erel
= (Elf_External_Rel
*) external_relocs
;
2036 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2037 irela
= internal_relocs
;
2038 for (; erel
< erelend
; erel
++, irela
++)
2040 Elf_Internal_Rel irel
;
2042 elf_swap_reloc_in (abfd
, erel
, &irel
);
2043 irela
->r_offset
= irel
.r_offset
;
2044 irela
->r_info
= irel
.r_info
;
2045 irela
->r_addend
= 0;
2050 Elf_External_Rela
*erela
;
2051 Elf_External_Rela
*erelaend
;
2052 Elf_Internal_Rela
*irela
;
2054 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2056 erela
= (Elf_External_Rela
*) external_relocs
;
2057 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2058 irela
= internal_relocs
;
2059 for (; erela
< erelaend
; erela
++, irela
++)
2060 elf_swap_reloca_in (abfd
, erela
, irela
);
2066 /* Read and swap the relocs for a section. They may have been cached.
2067 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
2068 they are used as buffers to read into. They are known to be large
2069 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
2070 value is allocated using either malloc or bfd_alloc, according to
2071 the KEEP_MEMORY argument. */
2074 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2078 PTR external_relocs
;
2079 Elf_Internal_Rela
*internal_relocs
;
2080 boolean keep_memory
;
2082 Elf_Internal_Shdr
*rel_hdr
;
2084 Elf_Internal_Rela
*alloc2
= NULL
;
2086 if (elf_section_data (o
)->relocs
!= NULL
)
2087 return elf_section_data (o
)->relocs
;
2089 if (o
->reloc_count
== 0)
2092 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2094 if (internal_relocs
== NULL
)
2098 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2100 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2102 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2103 if (internal_relocs
== NULL
)
2107 if (external_relocs
== NULL
)
2109 size_t size
= (size_t) rel_hdr
->sh_size
;
2111 if (elf_section_data (o
)->rel_hdr2
)
2112 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2113 alloc1
= (PTR
) bfd_malloc (size
);
2116 external_relocs
= alloc1
;
2119 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2123 if (!elf_link_read_relocs_from_section
2125 elf_section_data (o
)->rel_hdr2
,
2126 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2127 internal_relocs
+ rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
))
2130 /* Cache the results for next time, if we can. */
2132 elf_section_data (o
)->relocs
= internal_relocs
;
2137 /* Don't free alloc2, since if it was allocated we are passing it
2138 back (under the name of internal_relocs). */
2140 return internal_relocs
;
2151 /* Record an assignment to a symbol made by a linker script. We need
2152 this in case some dynamic object refers to this symbol. */
2156 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2158 struct bfd_link_info
*info
;
2162 struct elf_link_hash_entry
*h
;
2164 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2167 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2171 if (h
->root
.type
== bfd_link_hash_new
)
2172 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2174 /* If this symbol is being provided by the linker script, and it is
2175 currently defined by a dynamic object, but not by a regular
2176 object, then mark it as undefined so that the generic linker will
2177 force the correct value. */
2179 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2180 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2181 h
->root
.type
= bfd_link_hash_undefined
;
2183 /* If this symbol is not being provided by the linker script, and it is
2184 currently defined by a dynamic object, but not by a regular object,
2185 then clear out any version information because the symbol will not be
2186 associated with the dynamic object any more. */
2188 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2189 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2190 h
->verinfo
.verdef
= NULL
;
2192 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2193 h
->type
= STT_OBJECT
;
2195 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2196 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2198 && h
->dynindx
== -1)
2200 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2203 /* If this is a weak defined symbol, and we know a corresponding
2204 real symbol from the same dynamic object, make sure the real
2205 symbol is also made into a dynamic symbol. */
2206 if (h
->weakdef
!= NULL
2207 && h
->weakdef
->dynindx
== -1)
2209 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2217 /* This structure is used to pass information to
2218 elf_link_assign_sym_version. */
2220 struct elf_assign_sym_version_info
2224 /* General link information. */
2225 struct bfd_link_info
*info
;
2227 struct bfd_elf_version_tree
*verdefs
;
2228 /* Whether we are exporting all dynamic symbols. */
2229 boolean export_dynamic
;
2230 /* Whether we removed any symbols from the dynamic symbol table. */
2231 boolean removed_dynamic
;
2232 /* Whether we had a failure. */
2236 /* This structure is used to pass information to
2237 elf_link_find_version_dependencies. */
2239 struct elf_find_verdep_info
2243 /* General link information. */
2244 struct bfd_link_info
*info
;
2245 /* The number of dependencies. */
2247 /* Whether we had a failure. */
2251 /* Array used to determine the number of hash table buckets to use
2252 based on the number of symbols there are. If there are fewer than
2253 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2254 fewer than 37 we use 17 buckets, and so forth. We never use more
2255 than 32771 buckets. */
2257 static const size_t elf_buckets
[] =
2259 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2263 /* Compute bucket count for hashing table. We do not use a static set
2264 of possible tables sizes anymore. Instead we determine for all
2265 possible reasonable sizes of the table the outcome (i.e., the
2266 number of collisions etc) and choose the best solution. The
2267 weighting functions are not too simple to allow the table to grow
2268 without bounds. Instead one of the weighting factors is the size.
2269 Therefore the result is always a good payoff between few collisions
2270 (= short chain lengths) and table size. */
2272 compute_bucket_count (info
)
2273 struct bfd_link_info
*info
;
2275 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2277 unsigned long int *hashcodes
;
2278 unsigned long int *hashcodesp
;
2279 unsigned long int i
;
2281 /* Compute the hash values for all exported symbols. At the same
2282 time store the values in an array so that we could use them for
2284 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2285 * sizeof (unsigned long int));
2286 if (hashcodes
== NULL
)
2288 hashcodesp
= hashcodes
;
2290 /* Put all hash values in HASHCODES. */
2291 elf_link_hash_traverse (elf_hash_table (info
),
2292 elf_collect_hash_codes
, &hashcodesp
);
2294 /* We have a problem here. The following code to optimize the table
2295 size requires an integer type with more the 32 bits. If
2296 BFD_HOST_U_64_BIT is set we know about such a type. */
2297 #ifdef BFD_HOST_U_64_BIT
2298 if (info
->optimize
== true)
2300 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2303 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2304 unsigned long int *counts
;
2306 /* Possible optimization parameters: if we have NSYMS symbols we say
2307 that the hashing table must at least have NSYMS/4 and at most
2309 minsize
= nsyms
/ 4;
2312 best_size
= maxsize
= nsyms
* 2;
2314 /* Create array where we count the collisions in. We must use bfd_malloc
2315 since the size could be large. */
2316 counts
= (unsigned long int *) bfd_malloc (maxsize
2317 * sizeof (unsigned long int));
2324 /* Compute the "optimal" size for the hash table. The criteria is a
2325 minimal chain length. The minor criteria is (of course) the size
2327 for (i
= minsize
; i
< maxsize
; ++i
)
2329 /* Walk through the array of hashcodes and count the collisions. */
2330 BFD_HOST_U_64_BIT max
;
2331 unsigned long int j
;
2332 unsigned long int fact
;
2334 memset (counts
, '\0', i
* sizeof (unsigned long int));
2336 /* Determine how often each hash bucket is used. */
2337 for (j
= 0; j
< nsyms
; ++j
)
2338 ++counts
[hashcodes
[j
] % i
];
2340 /* For the weight function we need some information about the
2341 pagesize on the target. This is information need not be 100%
2342 accurate. Since this information is not available (so far) we
2343 define it here to a reasonable default value. If it is crucial
2344 to have a better value some day simply define this value. */
2345 # ifndef BFD_TARGET_PAGESIZE
2346 # define BFD_TARGET_PAGESIZE (4096)
2349 /* We in any case need 2 + NSYMS entries for the size values and
2351 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2354 /* Variant 1: optimize for short chains. We add the squares
2355 of all the chain lengths (which favous many small chain
2356 over a few long chains). */
2357 for (j
= 0; j
< i
; ++j
)
2358 max
+= counts
[j
] * counts
[j
];
2360 /* This adds penalties for the overall size of the table. */
2361 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2364 /* Variant 2: Optimize a lot more for small table. Here we
2365 also add squares of the size but we also add penalties for
2366 empty slots (the +1 term). */
2367 for (j
= 0; j
< i
; ++j
)
2368 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2370 /* The overall size of the table is considered, but not as
2371 strong as in variant 1, where it is squared. */
2372 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2376 /* Compare with current best results. */
2377 if (max
< best_chlen
)
2387 #endif /* defined (BFD_HOST_U_64_BIT) */
2389 /* This is the fallback solution if no 64bit type is available or if we
2390 are not supposed to spend much time on optimizations. We select the
2391 bucket count using a fixed set of numbers. */
2392 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2394 best_size
= elf_buckets
[i
];
2395 if (dynsymcount
< elf_buckets
[i
+ 1])
2400 /* Free the arrays we needed. */
2406 /* Remove SECTION from the BFD. If a symbol for SECTION was going to
2407 be put into the dynamic symbol table, remove it, and renumber
2408 subsequent entries. */
2411 elf_link_remove_section_and_adjust_dynindices (info
, section
)
2412 struct bfd_link_info
*info
;
2415 /* Remove the section from the output list. */
2416 _bfd_strip_section_from_output (section
);
2418 if (elf_section_data (section
->output_section
)->dynindx
)
2423 /* We were going to output an entry in the dynamic symbol table
2424 for the symbol corresponding to this section. Now, the
2425 section is gone. So, we must renumber the dynamic indices of
2426 all subsequent sections and all other entries in the dynamic
2428 elf_section_data (section
->output_section
)->dynindx
= 0;
2429 for (s
= section
->output_section
->next
; s
; s
= s
->next
)
2430 if (elf_section_data (s
)->dynindx
)
2431 --elf_section_data (s
)->dynindx
;
2433 elf_link_hash_traverse (elf_hash_table (info
),
2434 _bfd_elf_link_adjust_dynindx
,
2437 /* There is one less dynamic symbol than there was before. */
2438 --elf_hash_table (info
)->dynsymcount
;
2442 /* Set up the sizes and contents of the ELF dynamic sections. This is
2443 called by the ELF linker emulation before_allocation routine. We
2444 must set the sizes of the sections before the linker sets the
2445 addresses of the various sections. */
2448 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2449 export_dynamic
, filter_shlib
,
2450 auxiliary_filters
, info
, sinterpptr
,
2455 boolean export_dynamic
;
2456 const char *filter_shlib
;
2457 const char * const *auxiliary_filters
;
2458 struct bfd_link_info
*info
;
2459 asection
**sinterpptr
;
2460 struct bfd_elf_version_tree
*verdefs
;
2462 bfd_size_type soname_indx
;
2464 struct elf_backend_data
*bed
;
2465 bfd_size_type old_dynsymcount
;
2466 struct elf_assign_sym_version_info asvinfo
;
2470 soname_indx
= (bfd_size_type
) -1;
2472 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2475 /* The backend may have to create some sections regardless of whether
2476 we're dynamic or not. */
2477 bed
= get_elf_backend_data (output_bfd
);
2478 if (bed
->elf_backend_always_size_sections
2479 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2482 dynobj
= elf_hash_table (info
)->dynobj
;
2484 /* If there were no dynamic objects in the link, there is nothing to
2489 /* If we are supposed to export all symbols into the dynamic symbol
2490 table (this is not the normal case), then do so. */
2493 struct elf_info_failed eif
;
2497 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2503 if (elf_hash_table (info
)->dynamic_sections_created
)
2505 struct elf_info_failed eif
;
2506 struct elf_link_hash_entry
*h
;
2507 bfd_size_type strsize
;
2509 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2510 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2514 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2515 soname
, true, true);
2516 if (soname_indx
== (bfd_size_type
) -1
2517 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2523 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2531 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2533 if (indx
== (bfd_size_type
) -1
2534 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2538 if (filter_shlib
!= NULL
)
2542 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2543 filter_shlib
, true, true);
2544 if (indx
== (bfd_size_type
) -1
2545 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2549 if (auxiliary_filters
!= NULL
)
2551 const char * const *p
;
2553 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2557 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2559 if (indx
== (bfd_size_type
) -1
2560 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2565 /* Attach all the symbols to their version information. */
2566 asvinfo
.output_bfd
= output_bfd
;
2567 asvinfo
.info
= info
;
2568 asvinfo
.verdefs
= verdefs
;
2569 asvinfo
.export_dynamic
= export_dynamic
;
2570 asvinfo
.removed_dynamic
= false;
2571 asvinfo
.failed
= false;
2573 elf_link_hash_traverse (elf_hash_table (info
),
2574 elf_link_assign_sym_version
,
2579 /* Find all symbols which were defined in a dynamic object and make
2580 the backend pick a reasonable value for them. */
2583 elf_link_hash_traverse (elf_hash_table (info
),
2584 elf_adjust_dynamic_symbol
,
2589 /* Add some entries to the .dynamic section. We fill in some of the
2590 values later, in elf_bfd_final_link, but we must add the entries
2591 now so that we know the final size of the .dynamic section. */
2593 /* If there are initialization and/or finalization functions to
2594 call then add the corresponding DT_INIT/DT_FINI entries. */
2595 h
= (info
->init_function
2596 ? elf_link_hash_lookup (elf_hash_table (info
),
2597 info
->init_function
, false,
2601 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2602 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2604 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2607 h
= (info
->fini_function
2608 ? elf_link_hash_lookup (elf_hash_table (info
),
2609 info
->fini_function
, false,
2613 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2614 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2616 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2620 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2621 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2622 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2623 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2624 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2625 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2626 sizeof (Elf_External_Sym
)))
2630 /* The backend must work out the sizes of all the other dynamic
2632 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2633 if (bed
->elf_backend_size_dynamic_sections
2634 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2637 if (elf_hash_table (info
)->dynamic_sections_created
)
2641 size_t bucketcount
= 0;
2642 Elf_Internal_Sym isym
;
2644 /* Set up the version definition section. */
2645 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2646 BFD_ASSERT (s
!= NULL
);
2648 /* We may have created additional version definitions if we are
2649 just linking a regular application. */
2650 verdefs
= asvinfo
.verdefs
;
2652 if (verdefs
== NULL
)
2653 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2658 struct bfd_elf_version_tree
*t
;
2660 Elf_Internal_Verdef def
;
2661 Elf_Internal_Verdaux defaux
;
2663 if (asvinfo
.removed_dynamic
)
2665 /* Some dynamic symbols were changed to be local
2666 symbols. In this case, we renumber all of the
2667 dynamic symbols, so that we don't have a hole. If
2668 the backend changed dynsymcount, then assume that the
2669 new symbols are at the start. This is the case on
2670 the MIPS. FIXME: The names of the removed symbols
2671 will still be in the dynamic string table, wasting
2673 elf_hash_table (info
)->dynsymcount
=
2674 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2675 elf_link_hash_traverse (elf_hash_table (info
),
2676 elf_link_renumber_dynsyms
,
2683 /* Make space for the base version. */
2684 size
+= sizeof (Elf_External_Verdef
);
2685 size
+= sizeof (Elf_External_Verdaux
);
2688 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2690 struct bfd_elf_version_deps
*n
;
2692 size
+= sizeof (Elf_External_Verdef
);
2693 size
+= sizeof (Elf_External_Verdaux
);
2696 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2697 size
+= sizeof (Elf_External_Verdaux
);
2700 s
->_raw_size
= size
;
2701 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2702 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2705 /* Fill in the version definition section. */
2709 def
.vd_version
= VER_DEF_CURRENT
;
2710 def
.vd_flags
= VER_FLG_BASE
;
2713 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2714 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2715 + sizeof (Elf_External_Verdaux
));
2717 if (soname_indx
!= (bfd_size_type
) -1)
2719 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2720 defaux
.vda_name
= soname_indx
;
2727 name
= output_bfd
->filename
;
2728 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2729 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2731 if (indx
== (bfd_size_type
) -1)
2733 defaux
.vda_name
= indx
;
2735 defaux
.vda_next
= 0;
2737 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2738 (Elf_External_Verdef
*)p
);
2739 p
+= sizeof (Elf_External_Verdef
);
2740 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2741 (Elf_External_Verdaux
*) p
);
2742 p
+= sizeof (Elf_External_Verdaux
);
2744 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2747 struct bfd_elf_version_deps
*n
;
2748 struct elf_link_hash_entry
*h
;
2751 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2754 /* Add a symbol representing this version. */
2756 if (! (_bfd_generic_link_add_one_symbol
2757 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2758 (bfd_vma
) 0, (const char *) NULL
, false,
2759 get_elf_backend_data (dynobj
)->collect
,
2760 (struct bfd_link_hash_entry
**) &h
)))
2762 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2763 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2764 h
->type
= STT_OBJECT
;
2765 h
->verinfo
.vertree
= t
;
2767 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2770 def
.vd_version
= VER_DEF_CURRENT
;
2772 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2773 def
.vd_flags
|= VER_FLG_WEAK
;
2774 def
.vd_ndx
= t
->vernum
+ 1;
2775 def
.vd_cnt
= cdeps
+ 1;
2776 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2777 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2778 if (t
->next
!= NULL
)
2779 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2780 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2784 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2785 (Elf_External_Verdef
*) p
);
2786 p
+= sizeof (Elf_External_Verdef
);
2788 defaux
.vda_name
= h
->dynstr_index
;
2789 if (t
->deps
== NULL
)
2790 defaux
.vda_next
= 0;
2792 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2793 t
->name_indx
= defaux
.vda_name
;
2795 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2796 (Elf_External_Verdaux
*) p
);
2797 p
+= sizeof (Elf_External_Verdaux
);
2799 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2801 if (n
->version_needed
== NULL
)
2803 /* This can happen if there was an error in the
2805 defaux
.vda_name
= 0;
2808 defaux
.vda_name
= n
->version_needed
->name_indx
;
2809 if (n
->next
== NULL
)
2810 defaux
.vda_next
= 0;
2812 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2814 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2815 (Elf_External_Verdaux
*) p
);
2816 p
+= sizeof (Elf_External_Verdaux
);
2820 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2821 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2824 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2827 /* Work out the size of the version reference section. */
2829 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2830 BFD_ASSERT (s
!= NULL
);
2832 struct elf_find_verdep_info sinfo
;
2834 sinfo
.output_bfd
= output_bfd
;
2836 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2837 if (sinfo
.vers
== 0)
2839 sinfo
.failed
= false;
2841 elf_link_hash_traverse (elf_hash_table (info
),
2842 elf_link_find_version_dependencies
,
2845 if (elf_tdata (output_bfd
)->verref
== NULL
)
2846 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2849 Elf_Internal_Verneed
*t
;
2854 /* Build the version definition section. */
2857 for (t
= elf_tdata (output_bfd
)->verref
;
2861 Elf_Internal_Vernaux
*a
;
2863 size
+= sizeof (Elf_External_Verneed
);
2865 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2866 size
+= sizeof (Elf_External_Vernaux
);
2869 s
->_raw_size
= size
;
2870 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2871 if (s
->contents
== NULL
)
2875 for (t
= elf_tdata (output_bfd
)->verref
;
2880 Elf_Internal_Vernaux
*a
;
2884 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2887 t
->vn_version
= VER_NEED_CURRENT
;
2889 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2890 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2891 elf_dt_name (t
->vn_bfd
),
2894 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2895 t
->vn_bfd
->filename
, true, false);
2896 if (indx
== (bfd_size_type
) -1)
2899 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2900 if (t
->vn_nextref
== NULL
)
2903 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2904 + caux
* sizeof (Elf_External_Vernaux
));
2906 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2907 (Elf_External_Verneed
*) p
);
2908 p
+= sizeof (Elf_External_Verneed
);
2910 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2912 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2914 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2915 a
->vna_nodename
, true, false);
2916 if (indx
== (bfd_size_type
) -1)
2919 if (a
->vna_nextptr
== NULL
)
2922 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2924 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2925 (Elf_External_Vernaux
*) p
);
2926 p
+= sizeof (Elf_External_Vernaux
);
2930 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2931 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2934 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2938 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2940 /* Work out the size of the symbol version section. */
2941 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2942 BFD_ASSERT (s
!= NULL
);
2943 if (dynsymcount
== 0
2944 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2946 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2947 /* The DYNSYMCOUNT might have changed if we were going to
2948 output a dynamic symbol table entry for S. */
2949 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2953 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2954 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2955 if (s
->contents
== NULL
)
2958 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2962 /* Set the size of the .dynsym and .hash sections. We counted
2963 the number of dynamic symbols in elf_link_add_object_symbols.
2964 We will build the contents of .dynsym and .hash when we build
2965 the final symbol table, because until then we do not know the
2966 correct value to give the symbols. We built the .dynstr
2967 section as we went along in elf_link_add_object_symbols. */
2968 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2969 BFD_ASSERT (s
!= NULL
);
2970 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2971 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2972 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2975 /* The first entry in .dynsym is a dummy symbol. */
2982 elf_swap_symbol_out (output_bfd
, &isym
,
2983 (PTR
) (Elf_External_Sym
*) s
->contents
);
2985 /* Compute the size of the hashing table. As a side effect this
2986 computes the hash values for all the names we export. */
2987 bucketcount
= compute_bucket_count (info
);
2989 s
= bfd_get_section_by_name (dynobj
, ".hash");
2990 BFD_ASSERT (s
!= NULL
);
2991 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2992 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2993 if (s
->contents
== NULL
)
2995 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2997 put_word (output_bfd
, bucketcount
, s
->contents
);
2998 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
3000 elf_hash_table (info
)->bucketcount
= bucketcount
;
3002 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3003 BFD_ASSERT (s
!= NULL
);
3004 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3006 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3013 /* Fix up the flags for a symbol. This handles various cases which
3014 can only be fixed after all the input files are seen. This is
3015 currently called by both adjust_dynamic_symbol and
3016 assign_sym_version, which is unnecessary but perhaps more robust in
3017 the face of future changes. */
3020 elf_fix_symbol_flags (h
, eif
)
3021 struct elf_link_hash_entry
*h
;
3022 struct elf_info_failed
*eif
;
3024 /* If this symbol was mentioned in a non-ELF file, try to set
3025 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3026 permit a non-ELF file to correctly refer to a symbol defined in
3027 an ELF dynamic object. */
3028 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3030 if (h
->root
.type
!= bfd_link_hash_defined
3031 && h
->root
.type
!= bfd_link_hash_defweak
)
3032 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3033 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3036 if (h
->root
.u
.def
.section
->owner
!= NULL
3037 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3038 == bfd_target_elf_flavour
))
3039 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3040 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3042 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3045 if (h
->dynindx
== -1
3046 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3047 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3049 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3058 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3059 was first seen in a non-ELF file. Fortunately, if the symbol
3060 was first seen in an ELF file, we're probably OK unless the
3061 symbol was defined in a non-ELF file. Catch that case here.
3062 FIXME: We're still in trouble if the symbol was first seen in
3063 a dynamic object, and then later in a non-ELF regular object. */
3064 if ((h
->root
.type
== bfd_link_hash_defined
3065 || h
->root
.type
== bfd_link_hash_defweak
)
3066 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3067 && (h
->root
.u
.def
.section
->owner
!= NULL
3068 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3069 != bfd_target_elf_flavour
)
3070 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3071 && (h
->elf_link_hash_flags
3072 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3073 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3076 /* If this is a final link, and the symbol was defined as a common
3077 symbol in a regular object file, and there was no definition in
3078 any dynamic object, then the linker will have allocated space for
3079 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3080 flag will not have been set. */
3081 if (h
->root
.type
== bfd_link_hash_defined
3082 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3083 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3084 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3085 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3086 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3088 /* If -Bsymbolic was used (which means to bind references to global
3089 symbols to the definition within the shared object), and this
3090 symbol was defined in a regular object, then it actually doesn't
3091 need a PLT entry. */
3092 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3093 && eif
->info
->shared
3094 && eif
->info
->symbolic
3095 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3097 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3098 h
->plt
.offset
= (bfd_vma
) -1;
3104 /* Make the backend pick a good value for a dynamic symbol. This is
3105 called via elf_link_hash_traverse, and also calls itself
3109 elf_adjust_dynamic_symbol (h
, data
)
3110 struct elf_link_hash_entry
*h
;
3113 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3115 struct elf_backend_data
*bed
;
3117 /* Ignore indirect symbols. These are added by the versioning code. */
3118 if (h
->root
.type
== bfd_link_hash_indirect
)
3121 /* Fix the symbol flags. */
3122 if (! elf_fix_symbol_flags (h
, eif
))
3125 /* If this symbol does not require a PLT entry, and it is not
3126 defined by a dynamic object, or is not referenced by a regular
3127 object, ignore it. We do have to handle a weak defined symbol,
3128 even if no regular object refers to it, if we decided to add it
3129 to the dynamic symbol table. FIXME: Do we normally need to worry
3130 about symbols which are defined by one dynamic object and
3131 referenced by another one? */
3132 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3133 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3134 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3135 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3136 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3138 h
->plt
.offset
= (bfd_vma
) -1;
3142 /* If we've already adjusted this symbol, don't do it again. This
3143 can happen via a recursive call. */
3144 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3147 /* Don't look at this symbol again. Note that we must set this
3148 after checking the above conditions, because we may look at a
3149 symbol once, decide not to do anything, and then get called
3150 recursively later after REF_REGULAR is set below. */
3151 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3153 /* If this is a weak definition, and we know a real definition, and
3154 the real symbol is not itself defined by a regular object file,
3155 then get a good value for the real definition. We handle the
3156 real symbol first, for the convenience of the backend routine.
3158 Note that there is a confusing case here. If the real definition
3159 is defined by a regular object file, we don't get the real symbol
3160 from the dynamic object, but we do get the weak symbol. If the
3161 processor backend uses a COPY reloc, then if some routine in the
3162 dynamic object changes the real symbol, we will not see that
3163 change in the corresponding weak symbol. This is the way other
3164 ELF linkers work as well, and seems to be a result of the shared
3167 I will clarify this issue. Most SVR4 shared libraries define the
3168 variable _timezone and define timezone as a weak synonym. The
3169 tzset call changes _timezone. If you write
3170 extern int timezone;
3172 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3173 you might expect that, since timezone is a synonym for _timezone,
3174 the same number will print both times. However, if the processor
3175 backend uses a COPY reloc, then actually timezone will be copied
3176 into your process image, and, since you define _timezone
3177 yourself, _timezone will not. Thus timezone and _timezone will
3178 wind up at different memory locations. The tzset call will set
3179 _timezone, leaving timezone unchanged. */
3181 if (h
->weakdef
!= NULL
)
3183 struct elf_link_hash_entry
*weakdef
;
3185 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3186 || h
->root
.type
== bfd_link_hash_defweak
);
3187 weakdef
= h
->weakdef
;
3188 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3189 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3190 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3191 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3193 /* This symbol is defined by a regular object file, so we
3194 will not do anything special. Clear weakdef for the
3195 convenience of the processor backend. */
3200 /* There is an implicit reference by a regular object file
3201 via the weak symbol. */
3202 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3203 if (h
->weakdef
->elf_link_hash_flags
3204 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3205 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3206 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3211 /* If a symbol has no type and no size and does not require a PLT
3212 entry, then we are probably about to do the wrong thing here: we
3213 are probably going to create a COPY reloc for an empty object.
3214 This case can arise when a shared object is built with assembly
3215 code, and the assembly code fails to set the symbol type. */
3217 && h
->type
== STT_NOTYPE
3218 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3219 (*_bfd_error_handler
)
3220 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3221 h
->root
.root
.string
);
3223 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3224 bed
= get_elf_backend_data (dynobj
);
3225 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3234 /* This routine is used to export all defined symbols into the dynamic
3235 symbol table. It is called via elf_link_hash_traverse. */
3238 elf_export_symbol (h
, data
)
3239 struct elf_link_hash_entry
*h
;
3242 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3244 /* Ignore indirect symbols. These are added by the versioning code. */
3245 if (h
->root
.type
== bfd_link_hash_indirect
)
3248 if (h
->dynindx
== -1
3249 && (h
->elf_link_hash_flags
3250 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3252 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3262 /* Look through the symbols which are defined in other shared
3263 libraries and referenced here. Update the list of version
3264 dependencies. This will be put into the .gnu.version_r section.
3265 This function is called via elf_link_hash_traverse. */
3268 elf_link_find_version_dependencies (h
, data
)
3269 struct elf_link_hash_entry
*h
;
3272 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3273 Elf_Internal_Verneed
*t
;
3274 Elf_Internal_Vernaux
*a
;
3276 /* We only care about symbols defined in shared objects with version
3278 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3279 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3281 || h
->verinfo
.verdef
== NULL
)
3284 /* See if we already know about this version. */
3285 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3287 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3290 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3291 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3297 /* This is a new version. Add it to tree we are building. */
3301 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3304 rinfo
->failed
= true;
3308 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3309 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3310 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3313 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3315 /* Note that we are copying a string pointer here, and testing it
3316 above. If bfd_elf_string_from_elf_section is ever changed to
3317 discard the string data when low in memory, this will have to be
3319 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3321 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3322 a
->vna_nextptr
= t
->vn_auxptr
;
3324 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3327 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3334 /* Figure out appropriate versions for all the symbols. We may not
3335 have the version number script until we have read all of the input
3336 files, so until that point we don't know which symbols should be
3337 local. This function is called via elf_link_hash_traverse. */
3340 elf_link_assign_sym_version (h
, data
)
3341 struct elf_link_hash_entry
*h
;
3344 struct elf_assign_sym_version_info
*sinfo
=
3345 (struct elf_assign_sym_version_info
*) data
;
3346 struct bfd_link_info
*info
= sinfo
->info
;
3347 struct elf_info_failed eif
;
3350 /* Fix the symbol flags. */
3353 if (! elf_fix_symbol_flags (h
, &eif
))
3356 sinfo
->failed
= true;
3360 /* We only need version numbers for symbols defined in regular
3362 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3365 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3366 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3368 struct bfd_elf_version_tree
*t
;
3373 /* There are two consecutive ELF_VER_CHR characters if this is
3374 not a hidden symbol. */
3376 if (*p
== ELF_VER_CHR
)
3382 /* If there is no version string, we can just return out. */
3386 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3390 /* Look for the version. If we find it, it is no longer weak. */
3391 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3393 if (strcmp (t
->name
, p
) == 0)
3397 struct bfd_elf_version_expr
*d
;
3399 len
= p
- h
->root
.root
.string
;
3400 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3403 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3404 alc
[len
- 1] = '\0';
3405 if (alc
[len
- 2] == ELF_VER_CHR
)
3406 alc
[len
- 2] = '\0';
3408 h
->verinfo
.vertree
= t
;
3412 if (t
->globals
!= NULL
)
3414 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3415 if ((*d
->match
) (d
, alc
))
3419 /* See if there is anything to force this symbol to
3421 if (d
== NULL
&& t
->locals
!= NULL
)
3423 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3425 if ((*d
->match
) (d
, alc
))
3427 if (h
->dynindx
!= -1
3429 && ! sinfo
->export_dynamic
)
3431 sinfo
->removed_dynamic
= true;
3432 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3433 h
->elf_link_hash_flags
&=~
3434 ELF_LINK_HASH_NEEDS_PLT
;
3436 h
->plt
.offset
= (bfd_vma
) -1;
3437 /* FIXME: The name of the symbol has
3438 already been recorded in the dynamic
3439 string table section. */
3447 bfd_release (sinfo
->output_bfd
, alc
);
3452 /* If we are building an application, we need to create a
3453 version node for this version. */
3454 if (t
== NULL
&& ! info
->shared
)
3456 struct bfd_elf_version_tree
**pp
;
3459 /* If we aren't going to export this symbol, we don't need
3460 to worry about it. */
3461 if (h
->dynindx
== -1)
3464 t
= ((struct bfd_elf_version_tree
*)
3465 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3468 sinfo
->failed
= true;
3477 t
->name_indx
= (unsigned int) -1;
3481 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3483 t
->vernum
= version_index
;
3487 h
->verinfo
.vertree
= t
;
3491 /* We could not find the version for a symbol when
3492 generating a shared archive. Return an error. */
3493 (*_bfd_error_handler
)
3494 (_("%s: undefined versioned symbol name %s"),
3495 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3496 bfd_set_error (bfd_error_bad_value
);
3497 sinfo
->failed
= true;
3502 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3505 /* If we don't have a version for this symbol, see if we can find
3507 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3509 struct bfd_elf_version_tree
*t
;
3510 struct bfd_elf_version_tree
*deflt
;
3511 struct bfd_elf_version_expr
*d
;
3513 /* See if can find what version this symbol is in. If the
3514 symbol is supposed to be local, then don't actually register
3517 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3519 if (t
->globals
!= NULL
)
3521 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3523 if ((*d
->match
) (d
, h
->root
.root
.string
))
3525 h
->verinfo
.vertree
= t
;
3534 if (t
->locals
!= NULL
)
3536 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3538 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3540 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3542 h
->verinfo
.vertree
= t
;
3543 if (h
->dynindx
!= -1
3545 && ! sinfo
->export_dynamic
)
3547 sinfo
->removed_dynamic
= true;
3548 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3549 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3551 h
->plt
.offset
= (bfd_vma
) -1;
3552 /* FIXME: The name of the symbol has already
3553 been recorded in the dynamic string table
3565 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3567 h
->verinfo
.vertree
= deflt
;
3568 if (h
->dynindx
!= -1
3570 && ! sinfo
->export_dynamic
)
3572 sinfo
->removed_dynamic
= true;
3573 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3574 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3576 h
->plt
.offset
= (bfd_vma
) -1;
3577 /* FIXME: The name of the symbol has already been
3578 recorded in the dynamic string table section. */
3586 /* This function is used to renumber the dynamic symbols, if some of
3587 them are removed because they are marked as local. This is called
3588 via elf_link_hash_traverse. */
3591 elf_link_renumber_dynsyms (h
, data
)
3592 struct elf_link_hash_entry
*h
;
3595 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3597 if (h
->dynindx
!= -1)
3599 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3600 ++elf_hash_table (info
)->dynsymcount
;
3606 /* Final phase of ELF linker. */
3608 /* A structure we use to avoid passing large numbers of arguments. */
3610 struct elf_final_link_info
3612 /* General link information. */
3613 struct bfd_link_info
*info
;
3616 /* Symbol string table. */
3617 struct bfd_strtab_hash
*symstrtab
;
3618 /* .dynsym section. */
3619 asection
*dynsym_sec
;
3620 /* .hash section. */
3622 /* symbol version section (.gnu.version). */
3623 asection
*symver_sec
;
3624 /* Buffer large enough to hold contents of any section. */
3626 /* Buffer large enough to hold external relocs of any section. */
3627 PTR external_relocs
;
3628 /* Buffer large enough to hold internal relocs of any section. */
3629 Elf_Internal_Rela
*internal_relocs
;
3630 /* Buffer large enough to hold external local symbols of any input
3632 Elf_External_Sym
*external_syms
;
3633 /* Buffer large enough to hold internal local symbols of any input
3635 Elf_Internal_Sym
*internal_syms
;
3636 /* Array large enough to hold a symbol index for each local symbol
3637 of any input BFD. */
3639 /* Array large enough to hold a section pointer for each local
3640 symbol of any input BFD. */
3641 asection
**sections
;
3642 /* Buffer to hold swapped out symbols. */
3643 Elf_External_Sym
*symbuf
;
3644 /* Number of swapped out symbols in buffer. */
3645 size_t symbuf_count
;
3646 /* Number of symbols which fit in symbuf. */
3650 static boolean elf_link_output_sym
3651 PARAMS ((struct elf_final_link_info
*, const char *,
3652 Elf_Internal_Sym
*, asection
*));
3653 static boolean elf_link_flush_output_syms
3654 PARAMS ((struct elf_final_link_info
*));
3655 static boolean elf_link_output_extsym
3656 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3657 static boolean elf_link_input_bfd
3658 PARAMS ((struct elf_final_link_info
*, bfd
*));
3659 static boolean elf_reloc_link_order
3660 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3661 struct bfd_link_order
*));
3663 /* This struct is used to pass information to elf_link_output_extsym. */
3665 struct elf_outext_info
3669 struct elf_final_link_info
*finfo
;
3672 /* Do the final step of an ELF link. */
3675 elf_bfd_final_link (abfd
, info
)
3677 struct bfd_link_info
*info
;
3681 struct elf_final_link_info finfo
;
3682 register asection
*o
;
3683 register struct bfd_link_order
*p
;
3685 size_t max_contents_size
;
3686 size_t max_external_reloc_size
;
3687 size_t max_internal_reloc_count
;
3688 size_t max_sym_count
;
3690 Elf_Internal_Sym elfsym
;
3692 Elf_Internal_Shdr
*symtab_hdr
;
3693 Elf_Internal_Shdr
*symstrtab_hdr
;
3694 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3695 struct elf_outext_info eoinfo
;
3698 abfd
->flags
|= DYNAMIC
;
3700 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3701 dynobj
= elf_hash_table (info
)->dynobj
;
3704 finfo
.output_bfd
= abfd
;
3705 finfo
.symstrtab
= elf_stringtab_init ();
3706 if (finfo
.symstrtab
== NULL
)
3711 finfo
.dynsym_sec
= NULL
;
3712 finfo
.hash_sec
= NULL
;
3713 finfo
.symver_sec
= NULL
;
3717 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3718 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3719 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3720 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3721 /* Note that it is OK if symver_sec is NULL. */
3724 finfo
.contents
= NULL
;
3725 finfo
.external_relocs
= NULL
;
3726 finfo
.internal_relocs
= NULL
;
3727 finfo
.external_syms
= NULL
;
3728 finfo
.internal_syms
= NULL
;
3729 finfo
.indices
= NULL
;
3730 finfo
.sections
= NULL
;
3731 finfo
.symbuf
= NULL
;
3732 finfo
.symbuf_count
= 0;
3734 /* Count up the number of relocations we will output for each output
3735 section, so that we know the sizes of the reloc sections. We
3736 also figure out some maximum sizes. */
3737 max_contents_size
= 0;
3738 max_external_reloc_size
= 0;
3739 max_internal_reloc_count
= 0;
3741 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3745 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3747 if (p
->type
== bfd_section_reloc_link_order
3748 || p
->type
== bfd_symbol_reloc_link_order
)
3750 else if (p
->type
== bfd_indirect_link_order
)
3754 sec
= p
->u
.indirect
.section
;
3756 /* Mark all sections which are to be included in the
3757 link. This will normally be every section. We need
3758 to do this so that we can identify any sections which
3759 the linker has decided to not include. */
3760 sec
->linker_mark
= true;
3762 if (info
->relocateable
)
3763 o
->reloc_count
+= sec
->reloc_count
;
3765 if (sec
->_raw_size
> max_contents_size
)
3766 max_contents_size
= sec
->_raw_size
;
3767 if (sec
->_cooked_size
> max_contents_size
)
3768 max_contents_size
= sec
->_cooked_size
;
3770 /* We are interested in just local symbols, not all
3772 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3773 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3777 if (elf_bad_symtab (sec
->owner
))
3778 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3779 / sizeof (Elf_External_Sym
));
3781 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3783 if (sym_count
> max_sym_count
)
3784 max_sym_count
= sym_count
;
3786 if ((sec
->flags
& SEC_RELOC
) != 0)
3790 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3791 if (ext_size
> max_external_reloc_size
)
3792 max_external_reloc_size
= ext_size
;
3793 if (sec
->reloc_count
> max_internal_reloc_count
)
3794 max_internal_reloc_count
= sec
->reloc_count
;
3800 if (o
->reloc_count
> 0)
3801 o
->flags
|= SEC_RELOC
;
3804 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3805 set it (this is probably a bug) and if it is set
3806 assign_section_numbers will create a reloc section. */
3807 o
->flags
&=~ SEC_RELOC
;
3810 /* If the SEC_ALLOC flag is not set, force the section VMA to
3811 zero. This is done in elf_fake_sections as well, but forcing
3812 the VMA to 0 here will ensure that relocs against these
3813 sections are handled correctly. */
3814 if ((o
->flags
& SEC_ALLOC
) == 0
3815 && ! o
->user_set_vma
)
3819 /* Figure out the file positions for everything but the symbol table
3820 and the relocs. We set symcount to force assign_section_numbers
3821 to create a symbol table. */
3822 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
3823 BFD_ASSERT (! abfd
->output_has_begun
);
3824 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3827 /* That created the reloc sections. Set their sizes, and assign
3828 them file positions, and allocate some buffers. */
3829 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3831 if ((o
->flags
& SEC_RELOC
) != 0)
3833 Elf_Internal_Shdr
*rel_hdr
;
3834 register struct elf_link_hash_entry
**p
, **pend
;
3836 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3838 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3840 /* The contents field must last into write_object_contents,
3841 so we allocate it with bfd_alloc rather than malloc. */
3842 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3843 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3846 p
= ((struct elf_link_hash_entry
**)
3847 bfd_malloc (o
->reloc_count
3848 * sizeof (struct elf_link_hash_entry
*)));
3849 if (p
== NULL
&& o
->reloc_count
!= 0)
3851 elf_section_data (o
)->rel_hashes
= p
;
3852 pend
= p
+ o
->reloc_count
;
3853 for (; p
< pend
; p
++)
3856 /* Use the reloc_count field as an index when outputting the
3862 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3864 /* We have now assigned file positions for all the sections except
3865 .symtab and .strtab. We start the .symtab section at the current
3866 file position, and write directly to it. We build the .strtab
3867 section in memory. */
3868 bfd_get_symcount (abfd
) = 0;
3869 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3870 /* sh_name is set in prep_headers. */
3871 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3872 symtab_hdr
->sh_flags
= 0;
3873 symtab_hdr
->sh_addr
= 0;
3874 symtab_hdr
->sh_size
= 0;
3875 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3876 /* sh_link is set in assign_section_numbers. */
3877 /* sh_info is set below. */
3878 /* sh_offset is set just below. */
3879 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3881 off
= elf_tdata (abfd
)->next_file_pos
;
3882 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3884 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3885 incorrect. We do not yet know the size of the .symtab section.
3886 We correct next_file_pos below, after we do know the size. */
3888 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3889 continuously seeking to the right position in the file. */
3890 if (! info
->keep_memory
|| max_sym_count
< 20)
3891 finfo
.symbuf_size
= 20;
3893 finfo
.symbuf_size
= max_sym_count
;
3894 finfo
.symbuf
= ((Elf_External_Sym
*)
3895 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3896 if (finfo
.symbuf
== NULL
)
3899 /* Start writing out the symbol table. The first symbol is always a
3901 if (info
->strip
!= strip_all
|| info
->relocateable
)
3903 elfsym
.st_value
= 0;
3906 elfsym
.st_other
= 0;
3907 elfsym
.st_shndx
= SHN_UNDEF
;
3908 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3909 &elfsym
, bfd_und_section_ptr
))
3914 /* Some standard ELF linkers do this, but we don't because it causes
3915 bootstrap comparison failures. */
3916 /* Output a file symbol for the output file as the second symbol.
3917 We output this even if we are discarding local symbols, although
3918 I'm not sure if this is correct. */
3919 elfsym
.st_value
= 0;
3921 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3922 elfsym
.st_other
= 0;
3923 elfsym
.st_shndx
= SHN_ABS
;
3924 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3925 &elfsym
, bfd_abs_section_ptr
))
3929 /* Output a symbol for each section. We output these even if we are
3930 discarding local symbols, since they are used for relocs. These
3931 symbols have no names. We store the index of each one in the
3932 index field of the section, so that we can find it again when
3933 outputting relocs. */
3934 if (info
->strip
!= strip_all
|| info
->relocateable
)
3937 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3938 elfsym
.st_other
= 0;
3939 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3941 o
= section_from_elf_index (abfd
, i
);
3943 o
->target_index
= bfd_get_symcount (abfd
);
3944 elfsym
.st_shndx
= i
;
3945 if (info
->relocateable
|| o
== NULL
)
3946 elfsym
.st_value
= 0;
3948 elfsym
.st_value
= o
->vma
;
3949 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3955 /* Allocate some memory to hold information read in from the input
3957 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3958 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3959 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3960 bfd_malloc (max_internal_reloc_count
3961 * sizeof (Elf_Internal_Rela
)));
3962 finfo
.external_syms
= ((Elf_External_Sym
*)
3963 bfd_malloc (max_sym_count
3964 * sizeof (Elf_External_Sym
)));
3965 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3966 bfd_malloc (max_sym_count
3967 * sizeof (Elf_Internal_Sym
)));
3968 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3969 finfo
.sections
= ((asection
**)
3970 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3971 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3972 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3973 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3974 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3975 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3976 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3977 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3980 /* Since ELF permits relocations to be against local symbols, we
3981 must have the local symbols available when we do the relocations.
3982 Since we would rather only read the local symbols once, and we
3983 would rather not keep them in memory, we handle all the
3984 relocations for a single input file at the same time.
3986 Unfortunately, there is no way to know the total number of local
3987 symbols until we have seen all of them, and the local symbol
3988 indices precede the global symbol indices. This means that when
3989 we are generating relocateable output, and we see a reloc against
3990 a global symbol, we can not know the symbol index until we have
3991 finished examining all the local symbols to see which ones we are
3992 going to output. To deal with this, we keep the relocations in
3993 memory, and don't output them until the end of the link. This is
3994 an unfortunate waste of memory, but I don't see a good way around
3995 it. Fortunately, it only happens when performing a relocateable
3996 link, which is not the common case. FIXME: If keep_memory is set
3997 we could write the relocs out and then read them again; I don't
3998 know how bad the memory loss will be. */
4000 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4001 sub
->output_has_begun
= false;
4002 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4004 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4006 if (p
->type
== bfd_indirect_link_order
4007 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4008 == bfd_target_elf_flavour
))
4010 sub
= p
->u
.indirect
.section
->owner
;
4011 if (! sub
->output_has_begun
)
4013 if (! elf_link_input_bfd (&finfo
, sub
))
4015 sub
->output_has_begun
= true;
4018 else if (p
->type
== bfd_section_reloc_link_order
4019 || p
->type
== bfd_symbol_reloc_link_order
)
4021 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4026 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4032 /* That wrote out all the local symbols. Finish up the symbol table
4033 with the global symbols. */
4035 if (info
->strip
!= strip_all
&& info
->shared
)
4037 /* Output any global symbols that got converted to local in a
4038 version script. We do this in a separate step since ELF
4039 requires all local symbols to appear prior to any global
4040 symbols. FIXME: We should only do this if some global
4041 symbols were, in fact, converted to become local. FIXME:
4042 Will this work correctly with the Irix 5 linker? */
4043 eoinfo
.failed
= false;
4044 eoinfo
.finfo
= &finfo
;
4045 eoinfo
.localsyms
= true;
4046 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4052 /* The sh_info field records the index of the first non local
4054 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4056 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
4058 /* We get the global symbols from the hash table. */
4059 eoinfo
.failed
= false;
4060 eoinfo
.localsyms
= false;
4061 eoinfo
.finfo
= &finfo
;
4062 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4067 /* Flush all symbols to the file. */
4068 if (! elf_link_flush_output_syms (&finfo
))
4071 /* Now we know the size of the symtab section. */
4072 off
+= symtab_hdr
->sh_size
;
4074 /* Finish up and write out the symbol string table (.strtab)
4076 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4077 /* sh_name was set in prep_headers. */
4078 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4079 symstrtab_hdr
->sh_flags
= 0;
4080 symstrtab_hdr
->sh_addr
= 0;
4081 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4082 symstrtab_hdr
->sh_entsize
= 0;
4083 symstrtab_hdr
->sh_link
= 0;
4084 symstrtab_hdr
->sh_info
= 0;
4085 /* sh_offset is set just below. */
4086 symstrtab_hdr
->sh_addralign
= 1;
4088 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4089 elf_tdata (abfd
)->next_file_pos
= off
;
4091 if (bfd_get_symcount (abfd
) > 0)
4093 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4094 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4098 /* Adjust the relocs to have the correct symbol indices. */
4099 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4101 struct elf_link_hash_entry
**rel_hash
;
4102 Elf_Internal_Shdr
*rel_hdr
;
4104 if ((o
->flags
& SEC_RELOC
) == 0)
4107 rel_hash
= elf_section_data (o
)->rel_hashes
;
4108 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4109 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
4111 if (*rel_hash
== NULL
)
4114 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4116 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4118 Elf_External_Rel
*erel
;
4119 Elf_Internal_Rel irel
;
4121 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4122 elf_swap_reloc_in (abfd
, erel
, &irel
);
4123 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4124 ELF_R_TYPE (irel
.r_info
));
4125 elf_swap_reloc_out (abfd
, &irel
, erel
);
4129 Elf_External_Rela
*erela
;
4130 Elf_Internal_Rela irela
;
4132 BFD_ASSERT (rel_hdr
->sh_entsize
4133 == sizeof (Elf_External_Rela
));
4135 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4136 elf_swap_reloca_in (abfd
, erela
, &irela
);
4137 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4138 ELF_R_TYPE (irela
.r_info
));
4139 elf_swap_reloca_out (abfd
, &irela
, erela
);
4143 /* Set the reloc_count field to 0 to prevent write_relocs from
4144 trying to swap the relocs out itself. */
4148 /* If we are linking against a dynamic object, or generating a
4149 shared library, finish up the dynamic linking information. */
4152 Elf_External_Dyn
*dyncon
, *dynconend
;
4154 /* Fix up .dynamic entries. */
4155 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4156 BFD_ASSERT (o
!= NULL
);
4158 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4159 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4160 for (; dyncon
< dynconend
; dyncon
++)
4162 Elf_Internal_Dyn dyn
;
4166 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4173 name
= info
->init_function
;
4176 name
= info
->fini_function
;
4179 struct elf_link_hash_entry
*h
;
4181 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4182 false, false, true);
4184 && (h
->root
.type
== bfd_link_hash_defined
4185 || h
->root
.type
== bfd_link_hash_defweak
))
4187 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4188 o
= h
->root
.u
.def
.section
;
4189 if (o
->output_section
!= NULL
)
4190 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4191 + o
->output_offset
);
4194 /* The symbol is imported from another shared
4195 library and does not apply to this one. */
4199 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4214 name
= ".gnu.version_d";
4217 name
= ".gnu.version_r";
4220 name
= ".gnu.version";
4222 o
= bfd_get_section_by_name (abfd
, name
);
4223 BFD_ASSERT (o
!= NULL
);
4224 dyn
.d_un
.d_ptr
= o
->vma
;
4225 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4232 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4237 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4239 Elf_Internal_Shdr
*hdr
;
4241 hdr
= elf_elfsections (abfd
)[i
];
4242 if (hdr
->sh_type
== type
4243 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4245 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4246 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4249 if (dyn
.d_un
.d_val
== 0
4250 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4251 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4255 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4261 /* If we have created any dynamic sections, then output them. */
4264 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4267 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4269 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4270 || o
->_raw_size
== 0)
4272 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4274 /* At this point, we are only interested in sections
4275 created by elf_link_create_dynamic_sections. */
4278 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4280 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4282 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4283 o
->contents
, o
->output_offset
,
4291 /* The contents of the .dynstr section are actually in a
4293 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4294 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4295 || ! _bfd_stringtab_emit (abfd
,
4296 elf_hash_table (info
)->dynstr
))
4302 /* If we have optimized stabs strings, output them. */
4303 if (elf_hash_table (info
)->stab_info
!= NULL
)
4305 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4309 if (finfo
.symstrtab
!= NULL
)
4310 _bfd_stringtab_free (finfo
.symstrtab
);
4311 if (finfo
.contents
!= NULL
)
4312 free (finfo
.contents
);
4313 if (finfo
.external_relocs
!= NULL
)
4314 free (finfo
.external_relocs
);
4315 if (finfo
.internal_relocs
!= NULL
)
4316 free (finfo
.internal_relocs
);
4317 if (finfo
.external_syms
!= NULL
)
4318 free (finfo
.external_syms
);
4319 if (finfo
.internal_syms
!= NULL
)
4320 free (finfo
.internal_syms
);
4321 if (finfo
.indices
!= NULL
)
4322 free (finfo
.indices
);
4323 if (finfo
.sections
!= NULL
)
4324 free (finfo
.sections
);
4325 if (finfo
.symbuf
!= NULL
)
4326 free (finfo
.symbuf
);
4327 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4329 if ((o
->flags
& SEC_RELOC
) != 0
4330 && elf_section_data (o
)->rel_hashes
!= NULL
)
4331 free (elf_section_data (o
)->rel_hashes
);
4334 elf_tdata (abfd
)->linker
= true;
4339 if (finfo
.symstrtab
!= NULL
)
4340 _bfd_stringtab_free (finfo
.symstrtab
);
4341 if (finfo
.contents
!= NULL
)
4342 free (finfo
.contents
);
4343 if (finfo
.external_relocs
!= NULL
)
4344 free (finfo
.external_relocs
);
4345 if (finfo
.internal_relocs
!= NULL
)
4346 free (finfo
.internal_relocs
);
4347 if (finfo
.external_syms
!= NULL
)
4348 free (finfo
.external_syms
);
4349 if (finfo
.internal_syms
!= NULL
)
4350 free (finfo
.internal_syms
);
4351 if (finfo
.indices
!= NULL
)
4352 free (finfo
.indices
);
4353 if (finfo
.sections
!= NULL
)
4354 free (finfo
.sections
);
4355 if (finfo
.symbuf
!= NULL
)
4356 free (finfo
.symbuf
);
4357 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4359 if ((o
->flags
& SEC_RELOC
) != 0
4360 && elf_section_data (o
)->rel_hashes
!= NULL
)
4361 free (elf_section_data (o
)->rel_hashes
);
4367 /* Add a symbol to the output symbol table. */
4370 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4371 struct elf_final_link_info
*finfo
;
4373 Elf_Internal_Sym
*elfsym
;
4374 asection
*input_sec
;
4376 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4377 struct bfd_link_info
*info
,
4382 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4383 elf_backend_link_output_symbol_hook
;
4384 if (output_symbol_hook
!= NULL
)
4386 if (! ((*output_symbol_hook
)
4387 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4391 if (name
== (const char *) NULL
|| *name
== '\0')
4392 elfsym
->st_name
= 0;
4393 else if (input_sec
->flags
& SEC_EXCLUDE
)
4394 elfsym
->st_name
= 0;
4397 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4400 if (elfsym
->st_name
== (unsigned long) -1)
4404 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4406 if (! elf_link_flush_output_syms (finfo
))
4410 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4411 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4412 ++finfo
->symbuf_count
;
4414 ++ bfd_get_symcount (finfo
->output_bfd
);
4419 /* Flush the output symbols to the file. */
4422 elf_link_flush_output_syms (finfo
)
4423 struct elf_final_link_info
*finfo
;
4425 if (finfo
->symbuf_count
> 0)
4427 Elf_Internal_Shdr
*symtab
;
4429 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4431 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4433 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4434 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4435 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4438 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4440 finfo
->symbuf_count
= 0;
4446 /* Add an external symbol to the symbol table. This is called from
4447 the hash table traversal routine. When generating a shared object,
4448 we go through the symbol table twice. The first time we output
4449 anything that might have been forced to local scope in a version
4450 script. The second time we output the symbols that are still
4454 elf_link_output_extsym (h
, data
)
4455 struct elf_link_hash_entry
*h
;
4458 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4459 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4461 Elf_Internal_Sym sym
;
4462 asection
*input_sec
;
4464 /* Decide whether to output this symbol in this pass. */
4465 if (eoinfo
->localsyms
)
4467 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4472 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4476 /* If we are not creating a shared library, and this symbol is
4477 referenced by a shared library but is not defined anywhere, then
4478 warn that it is undefined. If we do not do this, the runtime
4479 linker will complain that the symbol is undefined when the
4480 program is run. We don't have to worry about symbols that are
4481 referenced by regular files, because we will already have issued
4482 warnings for them. */
4483 if (! finfo
->info
->relocateable
4484 && ! (finfo
->info
->shared
4485 && !finfo
->info
->no_undefined
)
4486 && h
->root
.type
== bfd_link_hash_undefined
4487 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4488 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4490 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4491 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4492 (asection
*) NULL
, 0)))
4494 eoinfo
->failed
= true;
4499 /* We don't want to output symbols that have never been mentioned by
4500 a regular file, or that we have been told to strip. However, if
4501 h->indx is set to -2, the symbol is used by a reloc and we must
4505 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4506 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4507 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4508 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4510 else if (finfo
->info
->strip
== strip_all
4511 || (finfo
->info
->strip
== strip_some
4512 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4513 h
->root
.root
.string
,
4514 false, false) == NULL
))
4519 /* If we're stripping it, and it's not a dynamic symbol, there's
4520 nothing else to do. */
4521 if (strip
&& h
->dynindx
== -1)
4525 sym
.st_size
= h
->size
;
4526 sym
.st_other
= h
->other
;
4527 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4528 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4529 else if (h
->root
.type
== bfd_link_hash_undefweak
4530 || h
->root
.type
== bfd_link_hash_defweak
)
4531 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4533 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4535 switch (h
->root
.type
)
4538 case bfd_link_hash_new
:
4542 case bfd_link_hash_undefined
:
4543 input_sec
= bfd_und_section_ptr
;
4544 sym
.st_shndx
= SHN_UNDEF
;
4547 case bfd_link_hash_undefweak
:
4548 input_sec
= bfd_und_section_ptr
;
4549 sym
.st_shndx
= SHN_UNDEF
;
4552 case bfd_link_hash_defined
:
4553 case bfd_link_hash_defweak
:
4555 input_sec
= h
->root
.u
.def
.section
;
4556 if (input_sec
->output_section
!= NULL
)
4559 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4560 input_sec
->output_section
);
4561 if (sym
.st_shndx
== (unsigned short) -1)
4563 (*_bfd_error_handler
)
4564 (_("%s: could not find output section %s for input section %s"),
4565 bfd_get_filename (finfo
->output_bfd
),
4566 input_sec
->output_section
->name
,
4568 eoinfo
->failed
= true;
4572 /* ELF symbols in relocateable files are section relative,
4573 but in nonrelocateable files they are virtual
4575 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4576 if (! finfo
->info
->relocateable
)
4577 sym
.st_value
+= input_sec
->output_section
->vma
;
4581 BFD_ASSERT (input_sec
->owner
== NULL
4582 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4583 sym
.st_shndx
= SHN_UNDEF
;
4584 input_sec
= bfd_und_section_ptr
;
4589 case bfd_link_hash_common
:
4590 input_sec
= h
->root
.u
.c
.p
->section
;
4591 sym
.st_shndx
= SHN_COMMON
;
4592 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4595 case bfd_link_hash_indirect
:
4596 /* These symbols are created by symbol versioning. They point
4597 to the decorated version of the name. For example, if the
4598 symbol foo@@GNU_1.2 is the default, which should be used when
4599 foo is used with no version, then we add an indirect symbol
4600 foo which points to foo@@GNU_1.2. We ignore these symbols,
4601 since the indirected symbol is already in the hash table. If
4602 the indirect symbol is non-ELF, fall through and output it. */
4603 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4607 case bfd_link_hash_warning
:
4608 /* We can't represent these symbols in ELF, although a warning
4609 symbol may have come from a .gnu.warning.SYMBOL section. We
4610 just put the target symbol in the hash table. If the target
4611 symbol does not really exist, don't do anything. */
4612 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4614 return (elf_link_output_extsym
4615 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4618 /* Give the processor backend a chance to tweak the symbol value,
4619 and also to finish up anything that needs to be done for this
4621 if ((h
->dynindx
!= -1
4622 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4623 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4625 struct elf_backend_data
*bed
;
4627 bed
= get_elf_backend_data (finfo
->output_bfd
);
4628 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4629 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4631 eoinfo
->failed
= true;
4636 /* If we are marking the symbol as undefined, and there are no
4637 non-weak references to this symbol from a regular object, then
4638 mark the symbol as weak undefined. We can't do this earlier,
4639 because it might not be marked as undefined until the
4640 finish_dynamic_symbol routine gets through with it. */
4641 if (sym
.st_shndx
== SHN_UNDEF
4642 && sym
.st_info
== ELF_ST_INFO (STB_GLOBAL
, h
->type
)
4643 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4644 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) == 0)
4645 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4647 /* If this symbol should be put in the .dynsym section, then put it
4648 there now. We have already know the symbol index. We also fill
4649 in the entry in the .hash section. */
4650 if (h
->dynindx
!= -1
4651 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4655 bfd_byte
*bucketpos
;
4658 sym
.st_name
= h
->dynstr_index
;
4660 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4661 (PTR
) (((Elf_External_Sym
*)
4662 finfo
->dynsym_sec
->contents
)
4665 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4666 bucket
= h
->elf_hash_value
% bucketcount
;
4667 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4668 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4669 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4670 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4671 put_word (finfo
->output_bfd
, chain
,
4672 ((bfd_byte
*) finfo
->hash_sec
->contents
4673 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4675 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4677 Elf_Internal_Versym iversym
;
4679 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4681 if (h
->verinfo
.verdef
== NULL
)
4682 iversym
.vs_vers
= 0;
4684 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4688 if (h
->verinfo
.vertree
== NULL
)
4689 iversym
.vs_vers
= 1;
4691 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4694 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4695 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4697 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4698 (((Elf_External_Versym
*)
4699 finfo
->symver_sec
->contents
)
4704 /* If we're stripping it, then it was just a dynamic symbol, and
4705 there's nothing else to do. */
4709 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4711 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4713 eoinfo
->failed
= true;
4720 /* Link an input file into the linker output file. This function
4721 handles all the sections and relocations of the input file at once.
4722 This is so that we only have to read the local symbols once, and
4723 don't have to keep them in memory. */
4726 elf_link_input_bfd (finfo
, input_bfd
)
4727 struct elf_final_link_info
*finfo
;
4730 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4731 bfd
*, asection
*, bfd_byte
*,
4732 Elf_Internal_Rela
*,
4733 Elf_Internal_Sym
*, asection
**));
4735 Elf_Internal_Shdr
*symtab_hdr
;
4738 Elf_External_Sym
*external_syms
;
4739 Elf_External_Sym
*esym
;
4740 Elf_External_Sym
*esymend
;
4741 Elf_Internal_Sym
*isym
;
4743 asection
**ppsection
;
4746 output_bfd
= finfo
->output_bfd
;
4748 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4750 /* If this is a dynamic object, we don't want to do anything here:
4751 we don't want the local symbols, and we don't want the section
4753 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4756 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4757 if (elf_bad_symtab (input_bfd
))
4759 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4764 locsymcount
= symtab_hdr
->sh_info
;
4765 extsymoff
= symtab_hdr
->sh_info
;
4768 /* Read the local symbols. */
4769 if (symtab_hdr
->contents
!= NULL
)
4770 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4771 else if (locsymcount
== 0)
4772 external_syms
= NULL
;
4775 external_syms
= finfo
->external_syms
;
4776 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4777 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4778 locsymcount
, input_bfd
)
4779 != locsymcount
* sizeof (Elf_External_Sym
)))
4783 /* Swap in the local symbols and write out the ones which we know
4784 are going into the output file. */
4785 esym
= external_syms
;
4786 esymend
= esym
+ locsymcount
;
4787 isym
= finfo
->internal_syms
;
4788 pindex
= finfo
->indices
;
4789 ppsection
= finfo
->sections
;
4790 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4794 Elf_Internal_Sym osym
;
4796 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4799 if (elf_bad_symtab (input_bfd
))
4801 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4808 if (isym
->st_shndx
== SHN_UNDEF
)
4809 isec
= bfd_und_section_ptr
;
4810 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4811 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4812 else if (isym
->st_shndx
== SHN_ABS
)
4813 isec
= bfd_abs_section_ptr
;
4814 else if (isym
->st_shndx
== SHN_COMMON
)
4815 isec
= bfd_com_section_ptr
;
4824 /* Don't output the first, undefined, symbol. */
4825 if (esym
== external_syms
)
4828 /* If we are stripping all symbols, we don't want to output this
4830 if (finfo
->info
->strip
== strip_all
)
4833 /* We never output section symbols. Instead, we use the section
4834 symbol of the corresponding section in the output file. */
4835 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4838 /* If we are discarding all local symbols, we don't want to
4839 output this one. If we are generating a relocateable output
4840 file, then some of the local symbols may be required by
4841 relocs; we output them below as we discover that they are
4843 if (finfo
->info
->discard
== discard_all
)
4846 /* If this symbol is defined in a section which we are
4847 discarding, we don't need to keep it, but note that
4848 linker_mark is only reliable for sections that have contents.
4849 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4850 as well as linker_mark. */
4851 if (isym
->st_shndx
> 0
4852 && isym
->st_shndx
< SHN_LORESERVE
4854 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4855 || (! finfo
->info
->relocateable
4856 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4859 /* Get the name of the symbol. */
4860 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4865 /* See if we are discarding symbols with this name. */
4866 if ((finfo
->info
->strip
== strip_some
4867 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4869 || (finfo
->info
->discard
== discard_l
4870 && bfd_is_local_label_name (input_bfd
, name
)))
4873 /* If we get here, we are going to output this symbol. */
4877 /* Adjust the section index for the output file. */
4878 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4879 isec
->output_section
);
4880 if (osym
.st_shndx
== (unsigned short) -1)
4883 *pindex
= bfd_get_symcount (output_bfd
);
4885 /* ELF symbols in relocateable files are section relative, but
4886 in executable files they are virtual addresses. Note that
4887 this code assumes that all ELF sections have an associated
4888 BFD section with a reasonable value for output_offset; below
4889 we assume that they also have a reasonable value for
4890 output_section. Any special sections must be set up to meet
4891 these requirements. */
4892 osym
.st_value
+= isec
->output_offset
;
4893 if (! finfo
->info
->relocateable
)
4894 osym
.st_value
+= isec
->output_section
->vma
;
4896 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4900 /* Relocate the contents of each section. */
4901 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4905 if (! o
->linker_mark
)
4907 /* This section was omitted from the link. */
4911 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4912 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4915 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4917 /* Section was created by elf_link_create_dynamic_sections
4922 /* Get the contents of the section. They have been cached by a
4923 relaxation routine. Note that o is a section in an input
4924 file, so the contents field will not have been set by any of
4925 the routines which work on output files. */
4926 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4927 contents
= elf_section_data (o
)->this_hdr
.contents
;
4930 contents
= finfo
->contents
;
4931 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4932 (file_ptr
) 0, o
->_raw_size
))
4936 if ((o
->flags
& SEC_RELOC
) != 0)
4938 Elf_Internal_Rela
*internal_relocs
;
4940 /* Get the swapped relocs. */
4941 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4942 (input_bfd
, o
, finfo
->external_relocs
,
4943 finfo
->internal_relocs
, false));
4944 if (internal_relocs
== NULL
4945 && o
->reloc_count
> 0)
4948 /* Relocate the section by invoking a back end routine.
4950 The back end routine is responsible for adjusting the
4951 section contents as necessary, and (if using Rela relocs
4952 and generating a relocateable output file) adjusting the
4953 reloc addend as necessary.
4955 The back end routine does not have to worry about setting
4956 the reloc address or the reloc symbol index.
4958 The back end routine is given a pointer to the swapped in
4959 internal symbols, and can access the hash table entries
4960 for the external symbols via elf_sym_hashes (input_bfd).
4962 When generating relocateable output, the back end routine
4963 must handle STB_LOCAL/STT_SECTION symbols specially. The
4964 output symbol is going to be a section symbol
4965 corresponding to the output section, which will require
4966 the addend to be adjusted. */
4968 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4969 input_bfd
, o
, contents
,
4971 finfo
->internal_syms
,
4975 if (finfo
->info
->relocateable
)
4977 Elf_Internal_Rela
*irela
;
4978 Elf_Internal_Rela
*irelaend
;
4979 struct elf_link_hash_entry
**rel_hash
;
4980 Elf_Internal_Shdr
*input_rel_hdr
;
4981 Elf_Internal_Shdr
*output_rel_hdr
;
4983 /* Adjust the reloc addresses and symbol indices. */
4985 irela
= internal_relocs
;
4986 irelaend
= irela
+ o
->reloc_count
;
4987 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4988 + o
->output_section
->reloc_count
);
4989 for (; irela
< irelaend
; irela
++, rel_hash
++)
4991 unsigned long r_symndx
;
4992 Elf_Internal_Sym
*isym
;
4995 irela
->r_offset
+= o
->output_offset
;
4997 r_symndx
= ELF_R_SYM (irela
->r_info
);
5002 if (r_symndx
>= locsymcount
5003 || (elf_bad_symtab (input_bfd
)
5004 && finfo
->sections
[r_symndx
] == NULL
))
5006 struct elf_link_hash_entry
*rh
;
5009 /* This is a reloc against a global symbol. We
5010 have not yet output all the local symbols, so
5011 we do not know the symbol index of any global
5012 symbol. We set the rel_hash entry for this
5013 reloc to point to the global hash table entry
5014 for this symbol. The symbol index is then
5015 set at the end of elf_bfd_final_link. */
5016 indx
= r_symndx
- extsymoff
;
5017 rh
= elf_sym_hashes (input_bfd
)[indx
];
5018 while (rh
->root
.type
== bfd_link_hash_indirect
5019 || rh
->root
.type
== bfd_link_hash_warning
)
5020 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5022 /* Setting the index to -2 tells
5023 elf_link_output_extsym that this symbol is
5025 BFD_ASSERT (rh
->indx
< 0);
5033 /* This is a reloc against a local symbol. */
5036 isym
= finfo
->internal_syms
+ r_symndx
;
5037 sec
= finfo
->sections
[r_symndx
];
5038 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5040 /* I suppose the backend ought to fill in the
5041 section of any STT_SECTION symbol against a
5042 processor specific section. If we have
5043 discarded a section, the output_section will
5044 be the absolute section. */
5046 && (bfd_is_abs_section (sec
)
5047 || (sec
->output_section
!= NULL
5048 && bfd_is_abs_section (sec
->output_section
))))
5050 else if (sec
== NULL
|| sec
->owner
== NULL
)
5052 bfd_set_error (bfd_error_bad_value
);
5057 r_symndx
= sec
->output_section
->target_index
;
5058 BFD_ASSERT (r_symndx
!= 0);
5063 if (finfo
->indices
[r_symndx
] == -1)
5069 if (finfo
->info
->strip
== strip_all
)
5071 /* You can't do ld -r -s. */
5072 bfd_set_error (bfd_error_invalid_operation
);
5076 /* This symbol was skipped earlier, but
5077 since it is needed by a reloc, we
5078 must output it now. */
5079 link
= symtab_hdr
->sh_link
;
5080 name
= bfd_elf_string_from_elf_section (input_bfd
,
5086 osec
= sec
->output_section
;
5088 _bfd_elf_section_from_bfd_section (output_bfd
,
5090 if (isym
->st_shndx
== (unsigned short) -1)
5093 isym
->st_value
+= sec
->output_offset
;
5094 if (! finfo
->info
->relocateable
)
5095 isym
->st_value
+= osec
->vma
;
5097 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5099 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5103 r_symndx
= finfo
->indices
[r_symndx
];
5106 irela
->r_info
= ELF_R_INFO (r_symndx
,
5107 ELF_R_TYPE (irela
->r_info
));
5110 /* Swap out the relocs. */
5111 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5112 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
5113 BFD_ASSERT (output_rel_hdr
->sh_entsize
5114 == input_rel_hdr
->sh_entsize
);
5115 irela
= internal_relocs
;
5116 irelaend
= irela
+ o
->reloc_count
;
5117 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5119 Elf_External_Rel
*erel
;
5121 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
5122 + o
->output_section
->reloc_count
);
5123 for (; irela
< irelaend
; irela
++, erel
++)
5125 Elf_Internal_Rel irel
;
5127 irel
.r_offset
= irela
->r_offset
;
5128 irel
.r_info
= irela
->r_info
;
5129 BFD_ASSERT (irela
->r_addend
== 0);
5130 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5135 Elf_External_Rela
*erela
;
5137 BFD_ASSERT (input_rel_hdr
->sh_entsize
5138 == sizeof (Elf_External_Rela
));
5139 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
5140 + o
->output_section
->reloc_count
);
5141 for (; irela
< irelaend
; irela
++, erela
++)
5142 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5145 o
->output_section
->reloc_count
+= o
->reloc_count
;
5149 /* Write out the modified section contents. */
5150 if (elf_section_data (o
)->stab_info
== NULL
)
5152 if (! (o
->flags
& SEC_EXCLUDE
) &&
5153 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5154 contents
, o
->output_offset
,
5155 (o
->_cooked_size
!= 0
5162 if (! (_bfd_write_section_stabs
5163 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5164 o
, &elf_section_data (o
)->stab_info
, contents
)))
5172 /* Generate a reloc when linking an ELF file. This is a reloc
5173 requested by the linker, and does come from any input file. This
5174 is used to build constructor and destructor tables when linking
5178 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5180 struct bfd_link_info
*info
;
5181 asection
*output_section
;
5182 struct bfd_link_order
*link_order
;
5184 reloc_howto_type
*howto
;
5188 struct elf_link_hash_entry
**rel_hash_ptr
;
5189 Elf_Internal_Shdr
*rel_hdr
;
5191 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5194 bfd_set_error (bfd_error_bad_value
);
5198 addend
= link_order
->u
.reloc
.p
->addend
;
5200 /* Figure out the symbol index. */
5201 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5202 + output_section
->reloc_count
);
5203 if (link_order
->type
== bfd_section_reloc_link_order
)
5205 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5206 BFD_ASSERT (indx
!= 0);
5207 *rel_hash_ptr
= NULL
;
5211 struct elf_link_hash_entry
*h
;
5213 /* Treat a reloc against a defined symbol as though it were
5214 actually against the section. */
5215 h
= ((struct elf_link_hash_entry
*)
5216 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5217 link_order
->u
.reloc
.p
->u
.name
,
5218 false, false, true));
5220 && (h
->root
.type
== bfd_link_hash_defined
5221 || h
->root
.type
== bfd_link_hash_defweak
))
5225 section
= h
->root
.u
.def
.section
;
5226 indx
= section
->output_section
->target_index
;
5227 *rel_hash_ptr
= NULL
;
5228 /* It seems that we ought to add the symbol value to the
5229 addend here, but in practice it has already been added
5230 because it was passed to constructor_callback. */
5231 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5235 /* Setting the index to -2 tells elf_link_output_extsym that
5236 this symbol is used by a reloc. */
5243 if (! ((*info
->callbacks
->unattached_reloc
)
5244 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5245 (asection
*) NULL
, (bfd_vma
) 0)))
5251 /* If this is an inplace reloc, we must write the addend into the
5253 if (howto
->partial_inplace
&& addend
!= 0)
5256 bfd_reloc_status_type rstat
;
5260 size
= bfd_get_reloc_size (howto
);
5261 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5262 if (buf
== (bfd_byte
*) NULL
)
5264 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5270 case bfd_reloc_outofrange
:
5272 case bfd_reloc_overflow
:
5273 if (! ((*info
->callbacks
->reloc_overflow
)
5275 (link_order
->type
== bfd_section_reloc_link_order
5276 ? bfd_section_name (output_bfd
,
5277 link_order
->u
.reloc
.p
->u
.section
)
5278 : link_order
->u
.reloc
.p
->u
.name
),
5279 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5287 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5288 (file_ptr
) link_order
->offset
, size
);
5294 /* The address of a reloc is relative to the section in a
5295 relocateable file, and is a virtual address in an executable
5297 offset
= link_order
->offset
;
5298 if (! info
->relocateable
)
5299 offset
+= output_section
->vma
;
5301 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5303 if (rel_hdr
->sh_type
== SHT_REL
)
5305 Elf_Internal_Rel irel
;
5306 Elf_External_Rel
*erel
;
5308 irel
.r_offset
= offset
;
5309 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5310 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5311 + output_section
->reloc_count
);
5312 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5316 Elf_Internal_Rela irela
;
5317 Elf_External_Rela
*erela
;
5319 irela
.r_offset
= offset
;
5320 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5321 irela
.r_addend
= addend
;
5322 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5323 + output_section
->reloc_count
);
5324 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5327 ++output_section
->reloc_count
;
5333 /* Allocate a pointer to live in a linker created section. */
5336 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5338 struct bfd_link_info
*info
;
5339 elf_linker_section_t
*lsect
;
5340 struct elf_link_hash_entry
*h
;
5341 const Elf_Internal_Rela
*rel
;
5343 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5344 elf_linker_section_pointers_t
*linker_section_ptr
;
5345 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5347 BFD_ASSERT (lsect
!= NULL
);
5349 /* Is this a global symbol? */
5352 /* Has this symbol already been allocated, if so, our work is done */
5353 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5358 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5359 /* Make sure this symbol is output as a dynamic symbol. */
5360 if (h
->dynindx
== -1)
5362 if (! elf_link_record_dynamic_symbol (info
, h
))
5366 if (lsect
->rel_section
)
5367 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5370 else /* Allocation of a pointer to a local symbol */
5372 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5374 /* Allocate a table to hold the local symbols if first time */
5377 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5378 register unsigned int i
;
5380 ptr
= (elf_linker_section_pointers_t
**)
5381 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5386 elf_local_ptr_offsets (abfd
) = ptr
;
5387 for (i
= 0; i
< num_symbols
; i
++)
5388 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5391 /* Has this symbol already been allocated, if so, our work is done */
5392 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5397 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5401 /* If we are generating a shared object, we need to
5402 output a R_<xxx>_RELATIVE reloc so that the
5403 dynamic linker can adjust this GOT entry. */
5404 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5405 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5409 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5410 from internal memory. */
5411 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5412 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5413 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5415 if (!linker_section_ptr
)
5418 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5419 linker_section_ptr
->addend
= rel
->r_addend
;
5420 linker_section_ptr
->which
= lsect
->which
;
5421 linker_section_ptr
->written_address_p
= false;
5422 *ptr_linker_section_ptr
= linker_section_ptr
;
5425 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5427 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5428 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5429 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5430 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5432 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5434 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5435 lsect
->sym_hash
->root
.root
.string
,
5436 (long)ARCH_SIZE
/ 8,
5437 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5443 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5445 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5448 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5449 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5457 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5460 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5463 /* Fill in the address for a pointer generated in alinker section. */
5466 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5469 struct bfd_link_info
*info
;
5470 elf_linker_section_t
*lsect
;
5471 struct elf_link_hash_entry
*h
;
5473 const Elf_Internal_Rela
*rel
;
5476 elf_linker_section_pointers_t
*linker_section_ptr
;
5478 BFD_ASSERT (lsect
!= NULL
);
5480 if (h
!= NULL
) /* global symbol */
5482 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5486 BFD_ASSERT (linker_section_ptr
!= NULL
);
5488 if (! elf_hash_table (info
)->dynamic_sections_created
5491 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5493 /* This is actually a static link, or it is a
5494 -Bsymbolic link and the symbol is defined
5495 locally. We must initialize this entry in the
5498 When doing a dynamic link, we create a .rela.<xxx>
5499 relocation entry to initialize the value. This
5500 is done in the finish_dynamic_symbol routine. */
5501 if (!linker_section_ptr
->written_address_p
)
5503 linker_section_ptr
->written_address_p
= true;
5504 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5505 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5509 else /* local symbol */
5511 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5512 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5513 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5514 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5518 BFD_ASSERT (linker_section_ptr
!= NULL
);
5520 /* Write out pointer if it hasn't been rewritten out before */
5521 if (!linker_section_ptr
->written_address_p
)
5523 linker_section_ptr
->written_address_p
= true;
5524 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5525 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5529 asection
*srel
= lsect
->rel_section
;
5530 Elf_Internal_Rela outrel
;
5532 /* We need to generate a relative reloc for the dynamic linker. */
5534 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5537 BFD_ASSERT (srel
!= NULL
);
5539 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5540 + lsect
->section
->output_offset
5541 + linker_section_ptr
->offset
);
5542 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5543 outrel
.r_addend
= 0;
5544 elf_swap_reloca_out (output_bfd
, &outrel
,
5545 (((Elf_External_Rela
*)
5546 lsect
->section
->contents
)
5547 + lsect
->section
->reloc_count
));
5548 ++lsect
->section
->reloc_count
;
5553 relocation
= (lsect
->section
->output_offset
5554 + linker_section_ptr
->offset
5555 - lsect
->hole_offset
5556 - lsect
->sym_offset
);
5559 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5560 lsect
->name
, (long)relocation
, (long)relocation
);
5563 /* Subtract out the addend, because it will get added back in by the normal
5565 return relocation
- linker_section_ptr
->addend
;
5568 /* Garbage collect unused sections. */
5570 static boolean elf_gc_mark
5571 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5572 asection
* (*gc_mark_hook
)
5573 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5574 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5576 static boolean elf_gc_sweep
5577 PARAMS ((struct bfd_link_info
*info
,
5578 boolean (*gc_sweep_hook
)
5579 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5580 const Elf_Internal_Rela
*relocs
))));
5582 static boolean elf_gc_sweep_symbol
5583 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5585 static boolean elf_gc_allocate_got_offsets
5586 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5588 static boolean elf_gc_propagate_vtable_entries_used
5589 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5591 static boolean elf_gc_smash_unused_vtentry_relocs
5592 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5594 /* The mark phase of garbage collection. For a given section, mark
5595 it, and all the sections which define symbols to which it refers. */
5598 elf_gc_mark (info
, sec
, gc_mark_hook
)
5599 struct bfd_link_info
*info
;
5601 asection
* (*gc_mark_hook
)
5602 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5603 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5609 /* Look through the section relocs. */
5611 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5613 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5614 Elf_Internal_Shdr
*symtab_hdr
;
5615 struct elf_link_hash_entry
**sym_hashes
;
5618 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5619 bfd
*input_bfd
= sec
->owner
;
5621 /* GCFIXME: how to arrange so that relocs and symbols are not
5622 reread continually? */
5624 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5625 sym_hashes
= elf_sym_hashes (input_bfd
);
5627 /* Read the local symbols. */
5628 if (elf_bad_symtab (input_bfd
))
5630 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5634 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5635 if (symtab_hdr
->contents
)
5636 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5637 else if (nlocsyms
== 0)
5641 locsyms
= freesyms
=
5642 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5643 if (freesyms
== NULL
5644 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5645 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5646 nlocsyms
, input_bfd
)
5647 != nlocsyms
* sizeof (Elf_External_Sym
)))
5654 /* Read the relocations. */
5655 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5656 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5657 info
->keep_memory
));
5658 if (relstart
== NULL
)
5663 relend
= relstart
+ sec
->reloc_count
;
5665 for (rel
= relstart
; rel
< relend
; rel
++)
5667 unsigned long r_symndx
;
5669 struct elf_link_hash_entry
*h
;
5672 r_symndx
= ELF_R_SYM (rel
->r_info
);
5676 if (elf_bad_symtab (sec
->owner
))
5678 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5679 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5680 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5683 h
= sym_hashes
[r_symndx
- extsymoff
];
5684 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5687 else if (r_symndx
>= nlocsyms
)
5689 h
= sym_hashes
[r_symndx
- extsymoff
];
5690 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5694 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5695 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5698 if (rsec
&& !rsec
->gc_mark
)
5699 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5707 if (!info
->keep_memory
)
5717 /* The sweep phase of garbage collection. Remove all garbage sections. */
5720 elf_gc_sweep (info
, gc_sweep_hook
)
5721 struct bfd_link_info
*info
;
5722 boolean (*gc_sweep_hook
)
5723 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5724 const Elf_Internal_Rela
*relocs
));
5728 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5732 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5734 /* Keep special sections. Keep .debug sections. */
5735 if ((o
->flags
& SEC_LINKER_CREATED
)
5736 || (o
->flags
& SEC_DEBUGGING
))
5742 /* Skip sweeping sections already excluded. */
5743 if (o
->flags
& SEC_EXCLUDE
)
5746 /* Since this is early in the link process, it is simple
5747 to remove a section from the output. */
5748 o
->flags
|= SEC_EXCLUDE
;
5750 /* But we also have to update some of the relocation
5751 info we collected before. */
5753 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5755 Elf_Internal_Rela
*internal_relocs
;
5758 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5759 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5760 if (internal_relocs
== NULL
)
5763 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5765 if (!info
->keep_memory
)
5766 free (internal_relocs
);
5774 /* Remove the symbols that were in the swept sections from the dynamic
5775 symbol table. GCFIXME: Anyone know how to get them out of the
5776 static symbol table as well? */
5780 elf_link_hash_traverse (elf_hash_table (info
),
5781 elf_gc_sweep_symbol
,
5784 elf_hash_table (info
)->dynsymcount
= i
;
5790 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5793 elf_gc_sweep_symbol (h
, idxptr
)
5794 struct elf_link_hash_entry
*h
;
5797 int *idx
= (int *) idxptr
;
5799 if (h
->dynindx
!= -1
5800 && ((h
->root
.type
!= bfd_link_hash_defined
5801 && h
->root
.type
!= bfd_link_hash_defweak
)
5802 || h
->root
.u
.def
.section
->gc_mark
))
5803 h
->dynindx
= (*idx
)++;
5808 /* Propogate collected vtable information. This is called through
5809 elf_link_hash_traverse. */
5812 elf_gc_propagate_vtable_entries_used (h
, okp
)
5813 struct elf_link_hash_entry
*h
;
5816 /* Those that are not vtables. */
5817 if (h
->vtable_parent
== NULL
)
5820 /* Those vtables that do not have parents, we cannot merge. */
5821 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5824 /* If we've already been done, exit. */
5825 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5828 /* Make sure the parent's table is up to date. */
5829 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5831 if (h
->vtable_entries_used
== NULL
)
5833 /* None of this table's entries were referenced. Re-use the
5835 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5836 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
5843 /* Or the parent's entries into ours. */
5844 cu
= h
->vtable_entries_used
;
5846 pu
= h
->vtable_parent
->vtable_entries_used
;
5849 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
5852 if (*pu
) *cu
= true;
5862 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5863 struct elf_link_hash_entry
*h
;
5867 bfd_vma hstart
, hend
;
5868 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5870 /* Take care of both those symbols that do not describe vtables as
5871 well as those that are not loaded. */
5872 if (h
->vtable_parent
== NULL
)
5875 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5876 || h
->root
.type
== bfd_link_hash_defweak
);
5878 sec
= h
->root
.u
.def
.section
;
5879 hstart
= h
->root
.u
.def
.value
;
5880 hend
= hstart
+ h
->size
;
5882 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5883 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5885 return *(boolean
*)okp
= false;
5886 relend
= relstart
+ sec
->reloc_count
;
5888 for (rel
= relstart
; rel
< relend
; ++rel
)
5889 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5891 /* If the entry is in use, do nothing. */
5892 if (h
->vtable_entries_used
5893 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
5895 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5896 if (h
->vtable_entries_used
[entry
])
5899 /* Otherwise, kill it. */
5900 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5906 /* Do mark and sweep of unused sections. */
5909 elf_gc_sections (abfd
, info
)
5911 struct bfd_link_info
*info
;
5915 asection
* (*gc_mark_hook
)
5916 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5917 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5919 if (!get_elf_backend_data (abfd
)->can_gc_sections
5920 || info
->relocateable
5921 || elf_hash_table (info
)->dynamic_sections_created
)
5924 /* Apply transitive closure to the vtable entry usage info. */
5925 elf_link_hash_traverse (elf_hash_table (info
),
5926 elf_gc_propagate_vtable_entries_used
,
5931 /* Kill the vtable relocations that were not used. */
5932 elf_link_hash_traverse (elf_hash_table (info
),
5933 elf_gc_smash_unused_vtentry_relocs
,
5938 /* Grovel through relocs to find out who stays ... */
5940 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5941 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5944 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5946 if (o
->flags
& SEC_KEEP
)
5947 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5952 /* ... and mark SEC_EXCLUDE for those that go. */
5953 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5959 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5962 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5965 struct elf_link_hash_entry
*h
;
5968 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5969 struct elf_link_hash_entry
**search
, *child
;
5970 bfd_size_type extsymcount
;
5972 /* The sh_info field of the symtab header tells us where the
5973 external symbols start. We don't care about the local symbols at
5975 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5976 if (!elf_bad_symtab (abfd
))
5977 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5979 sym_hashes
= elf_sym_hashes (abfd
);
5980 sym_hashes_end
= sym_hashes
+ extsymcount
;
5982 /* Hunt down the child symbol, which is in this section at the same
5983 offset as the relocation. */
5984 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5986 if ((child
= *search
) != NULL
5987 && (child
->root
.type
== bfd_link_hash_defined
5988 || child
->root
.type
== bfd_link_hash_defweak
)
5989 && child
->root
.u
.def
.section
== sec
5990 && child
->root
.u
.def
.value
== offset
)
5994 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5995 bfd_get_filename (abfd
), sec
->name
,
5996 (unsigned long)offset
);
5997 bfd_set_error (bfd_error_invalid_operation
);
6003 /* This *should* only be the absolute section. It could potentially
6004 be that someone has defined a non-global vtable though, which
6005 would be bad. It isn't worth paging in the local symbols to be
6006 sure though; that case should simply be handled by the assembler. */
6008 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6011 child
->vtable_parent
= h
;
6016 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6019 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6022 struct elf_link_hash_entry
*h
;
6025 if (addend
>= h
->vtable_entries_size
)
6028 boolean
*ptr
= h
->vtable_entries_used
;
6030 /* While the symbol is undefined, we have to be prepared to handle
6032 if (h
->root
.type
== bfd_link_hash_undefined
)
6039 /* Oops! We've got a reference past the defined end of
6040 the table. This is probably a bug -- shall we warn? */
6045 /* Allocate one extra entry for use as a "done" flag for the
6046 consolidation pass. */
6047 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6053 ptr
= realloc (ptr
-1, bytes
);
6057 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6058 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6062 ptr
= calloc (1, bytes
);
6067 /* And arrange for that done flag to be at index -1. */
6068 h
->vtable_entries_used
= ptr
+1;
6069 h
->vtable_entries_size
= size
;
6071 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6076 /* And an accompanying bit to work out final got entry offsets once
6077 we're done. Should be called from final_link. */
6080 elf_gc_common_finalize_got_offsets (abfd
, info
)
6082 struct bfd_link_info
*info
;
6085 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6088 /* The GOT offset is relative to the .got section, but the GOT header is
6089 put into the .got.plt section, if the backend uses it. */
6090 if (bed
->want_got_plt
)
6093 gotoff
= bed
->got_header_size
;
6095 /* Do the local .got entries first. */
6096 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6098 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6099 bfd_size_type j
, locsymcount
;
6100 Elf_Internal_Shdr
*symtab_hdr
;
6105 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6106 if (elf_bad_symtab (i
))
6107 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6109 locsymcount
= symtab_hdr
->sh_info
;
6111 for (j
= 0; j
< locsymcount
; ++j
)
6113 if (local_got
[j
] > 0)
6115 local_got
[j
] = gotoff
;
6116 gotoff
+= ARCH_SIZE
/ 8;
6119 local_got
[j
] = (bfd_vma
) -1;
6123 /* Then the global .got and .plt entries. */
6124 elf_link_hash_traverse (elf_hash_table (info
),
6125 elf_gc_allocate_got_offsets
,
6130 /* We need a special top-level link routine to convert got reference counts
6131 to real got offsets. */
6134 elf_gc_allocate_got_offsets (h
, offarg
)
6135 struct elf_link_hash_entry
*h
;
6138 bfd_vma
*off
= (bfd_vma
*) offarg
;
6140 if (h
->got
.refcount
> 0)
6142 h
->got
.offset
= off
[0];
6143 off
[0] += ARCH_SIZE
/ 8;
6146 h
->got
.offset
= (bfd_vma
) -1;
6151 /* Many folk need no more in the way of final link than this, once
6152 got entry reference counting is enabled. */
6155 elf_gc_common_final_link (abfd
, info
)
6157 struct bfd_link_info
*info
;
6159 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6162 /* Invoke the regular ELF backend linker to do all the work. */
6163 return elf_bfd_final_link (abfd
, info
);
6166 /* This function will be called though elf_link_hash_traverse to store
6167 all hash value of the exported symbols in an array. */
6170 elf_collect_hash_codes (h
, data
)
6171 struct elf_link_hash_entry
*h
;
6174 unsigned long **valuep
= (unsigned long **) data
;
6180 /* Ignore indirect symbols. These are added by the versioning code. */
6181 if (h
->dynindx
== -1)
6184 name
= h
->root
.root
.string
;
6185 p
= strchr (name
, ELF_VER_CHR
);
6188 alc
= bfd_malloc (p
- name
+ 1);
6189 memcpy (alc
, name
, p
- name
);
6190 alc
[p
- name
] = '\0';
6194 /* Compute the hash value. */
6195 ha
= bfd_elf_hash (name
);
6197 /* Store the found hash value in the array given as the argument. */
6200 /* And store it in the struct so that we can put it in the hash table
6202 h
->elf_hash_value
= ha
;