2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info
*info
;
30 struct bfd_elf_version_tree
*verdefs
;
33 static bfd_boolean is_global_data_symbol_definition
34 PARAMS ((bfd
*, Elf_Internal_Sym
*));
35 static bfd_boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd
*, carsym
*));
37 static bfd_boolean elf_link_add_object_symbols
38 PARAMS ((bfd
*, struct bfd_link_info
*));
39 static bfd_boolean elf_link_add_archive_symbols
40 PARAMS ((bfd
*, struct bfd_link_info
*));
41 static bfd_boolean elf_merge_symbol
42 PARAMS ((bfd
*, struct bfd_link_info
*, const char *,
43 Elf_Internal_Sym
*, asection
**, bfd_vma
*,
44 struct elf_link_hash_entry
**, bfd_boolean
*, bfd_boolean
*,
45 bfd_boolean
*, bfd_boolean
));
46 static bfd_boolean elf_add_default_symbol
47 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
48 const char *, Elf_Internal_Sym
*, asection
**, bfd_vma
*,
49 bfd_boolean
*, bfd_boolean
, bfd_boolean
));
50 static bfd_boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry
*, PTR
));
52 static bfd_boolean elf_finalize_dynstr
53 PARAMS ((bfd
*, struct bfd_link_info
*));
54 static bfd_boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
56 static bfd_boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry
*, PTR
));
58 static bfd_boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry
*, PTR
));
60 static bfd_boolean elf_link_assign_sym_version
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static bfd_boolean elf_collect_hash_codes
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static bfd_boolean elf_link_read_relocs_from_section
65 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
66 static size_t compute_bucket_count
67 PARAMS ((struct bfd_link_info
*));
68 static bfd_boolean elf_link_output_relocs
69 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
70 static bfd_boolean elf_link_size_reloc_section
71 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
72 static void elf_link_adjust_relocs
73 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
74 struct elf_link_hash_entry
**));
75 static int elf_link_sort_cmp1
76 PARAMS ((const void *, const void *));
77 static int elf_link_sort_cmp2
78 PARAMS ((const void *, const void *));
79 static size_t elf_link_sort_relocs
80 PARAMS ((bfd
*, struct bfd_link_info
*, asection
**));
81 static bfd_boolean elf_section_ignore_discarded_relocs
82 PARAMS ((asection
*));
84 /* Given an ELF BFD, add symbols to the global hash table as
88 elf_bfd_link_add_symbols (abfd
, info
)
90 struct bfd_link_info
*info
;
92 switch (bfd_get_format (abfd
))
95 return elf_link_add_object_symbols (abfd
, info
);
97 return elf_link_add_archive_symbols (abfd
, info
);
99 bfd_set_error (bfd_error_wrong_format
);
104 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
106 is_global_data_symbol_definition (abfd
, sym
)
107 bfd
* abfd ATTRIBUTE_UNUSED
;
108 Elf_Internal_Sym
* sym
;
110 /* Local symbols do not count, but target specific ones might. */
111 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
112 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
115 /* Function symbols do not count. */
116 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
119 /* If the section is undefined, then so is the symbol. */
120 if (sym
->st_shndx
== SHN_UNDEF
)
123 /* If the symbol is defined in the common section, then
124 it is a common definition and so does not count. */
125 if (sym
->st_shndx
== SHN_COMMON
)
128 /* If the symbol is in a target specific section then we
129 must rely upon the backend to tell us what it is. */
130 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
131 /* FIXME - this function is not coded yet:
133 return _bfd_is_global_symbol_definition (abfd, sym);
135 Instead for now assume that the definition is not global,
136 Even if this is wrong, at least the linker will behave
137 in the same way that it used to do. */
143 /* Search the symbol table of the archive element of the archive ABFD
144 whose archive map contains a mention of SYMDEF, and determine if
145 the symbol is defined in this element. */
147 elf_link_is_defined_archive_symbol (abfd
, symdef
)
151 Elf_Internal_Shdr
* hdr
;
152 bfd_size_type symcount
;
153 bfd_size_type extsymcount
;
154 bfd_size_type extsymoff
;
155 Elf_Internal_Sym
*isymbuf
;
156 Elf_Internal_Sym
*isym
;
157 Elf_Internal_Sym
*isymend
;
160 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
161 if (abfd
== (bfd
*) NULL
)
164 if (! bfd_check_format (abfd
, bfd_object
))
167 /* If we have already included the element containing this symbol in the
168 link then we do not need to include it again. Just claim that any symbol
169 it contains is not a definition, so that our caller will not decide to
170 (re)include this element. */
171 if (abfd
->archive_pass
)
174 /* Select the appropriate symbol table. */
175 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
176 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
178 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
180 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
182 /* The sh_info field of the symtab header tells us where the
183 external symbols start. We don't care about the local symbols. */
184 if (elf_bad_symtab (abfd
))
186 extsymcount
= symcount
;
191 extsymcount
= symcount
- hdr
->sh_info
;
192 extsymoff
= hdr
->sh_info
;
195 if (extsymcount
== 0)
198 /* Read in the symbol table. */
199 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
204 /* Scan the symbol table looking for SYMDEF. */
206 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
210 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
212 if (name
== (const char *) NULL
)
215 if (strcmp (name
, symdef
->name
) == 0)
217 result
= is_global_data_symbol_definition (abfd
, isym
);
227 /* Add symbols from an ELF archive file to the linker hash table. We
228 don't use _bfd_generic_link_add_archive_symbols because of a
229 problem which arises on UnixWare. The UnixWare libc.so is an
230 archive which includes an entry libc.so.1 which defines a bunch of
231 symbols. The libc.so archive also includes a number of other
232 object files, which also define symbols, some of which are the same
233 as those defined in libc.so.1. Correct linking requires that we
234 consider each object file in turn, and include it if it defines any
235 symbols we need. _bfd_generic_link_add_archive_symbols does not do
236 this; it looks through the list of undefined symbols, and includes
237 any object file which defines them. When this algorithm is used on
238 UnixWare, it winds up pulling in libc.so.1 early and defining a
239 bunch of symbols. This means that some of the other objects in the
240 archive are not included in the link, which is incorrect since they
241 precede libc.so.1 in the archive.
243 Fortunately, ELF archive handling is simpler than that done by
244 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
245 oddities. In ELF, if we find a symbol in the archive map, and the
246 symbol is currently undefined, we know that we must pull in that
249 Unfortunately, we do have to make multiple passes over the symbol
250 table until nothing further is resolved. */
253 elf_link_add_archive_symbols (abfd
, info
)
255 struct bfd_link_info
*info
;
258 bfd_boolean
*defined
= NULL
;
259 bfd_boolean
*included
= NULL
;
264 if (! bfd_has_map (abfd
))
266 /* An empty archive is a special case. */
267 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
269 bfd_set_error (bfd_error_no_armap
);
273 /* Keep track of all symbols we know to be already defined, and all
274 files we know to be already included. This is to speed up the
275 second and subsequent passes. */
276 c
= bfd_ardata (abfd
)->symdef_count
;
280 amt
*= sizeof (bfd_boolean
);
281 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
282 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
283 if (defined
== (bfd_boolean
*) NULL
|| included
== (bfd_boolean
*) NULL
)
286 symdefs
= bfd_ardata (abfd
)->symdefs
;
299 symdefend
= symdef
+ c
;
300 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
302 struct elf_link_hash_entry
*h
;
304 struct bfd_link_hash_entry
*undefs_tail
;
307 if (defined
[i
] || included
[i
])
309 if (symdef
->file_offset
== last
)
315 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
316 FALSE
, FALSE
, FALSE
);
323 /* If this is a default version (the name contains @@),
324 look up the symbol again with only one `@' as well
325 as without the version. The effect is that references
326 to the symbol with and without the version will be
327 matched by the default symbol in the archive. */
329 p
= strchr (symdef
->name
, ELF_VER_CHR
);
330 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
333 /* First check with only one `@'. */
334 len
= strlen (symdef
->name
);
335 copy
= bfd_alloc (abfd
, (bfd_size_type
) len
);
338 first
= p
- symdef
->name
+ 1;
339 memcpy (copy
, symdef
->name
, first
);
340 memcpy (copy
+ first
, symdef
->name
+ first
+ 1, len
- first
);
342 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
343 FALSE
, FALSE
, FALSE
);
347 /* We also need to check references to the symbol
348 without the version. */
350 copy
[first
- 1] = '\0';
351 h
= elf_link_hash_lookup (elf_hash_table (info
),
352 copy
, FALSE
, FALSE
, FALSE
);
355 bfd_release (abfd
, copy
);
361 if (h
->root
.type
== bfd_link_hash_common
)
363 /* We currently have a common symbol. The archive map contains
364 a reference to this symbol, so we may want to include it. We
365 only want to include it however, if this archive element
366 contains a definition of the symbol, not just another common
369 Unfortunately some archivers (including GNU ar) will put
370 declarations of common symbols into their archive maps, as
371 well as real definitions, so we cannot just go by the archive
372 map alone. Instead we must read in the element's symbol
373 table and check that to see what kind of symbol definition
375 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
378 else if (h
->root
.type
!= bfd_link_hash_undefined
)
380 if (h
->root
.type
!= bfd_link_hash_undefweak
)
385 /* We need to include this archive member. */
386 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
387 if (element
== (bfd
*) NULL
)
390 if (! bfd_check_format (element
, bfd_object
))
393 /* Doublecheck that we have not included this object
394 already--it should be impossible, but there may be
395 something wrong with the archive. */
396 if (element
->archive_pass
!= 0)
398 bfd_set_error (bfd_error_bad_value
);
401 element
->archive_pass
= 1;
403 undefs_tail
= info
->hash
->undefs_tail
;
405 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
408 if (! elf_link_add_object_symbols (element
, info
))
411 /* If there are any new undefined symbols, we need to make
412 another pass through the archive in order to see whether
413 they can be defined. FIXME: This isn't perfect, because
414 common symbols wind up on undefs_tail and because an
415 undefined symbol which is defined later on in this pass
416 does not require another pass. This isn't a bug, but it
417 does make the code less efficient than it could be. */
418 if (undefs_tail
!= info
->hash
->undefs_tail
)
421 /* Look backward to mark all symbols from this object file
422 which we have already seen in this pass. */
426 included
[mark
] = TRUE
;
431 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
433 /* We mark subsequent symbols from this object file as we go
434 on through the loop. */
435 last
= symdef
->file_offset
;
446 if (defined
!= (bfd_boolean
*) NULL
)
448 if (included
!= (bfd_boolean
*) NULL
)
453 /* This function is called when we want to define a new symbol. It
454 handles the various cases which arise when we find a definition in
455 a dynamic object, or when there is already a definition in a
456 dynamic object. The new symbol is described by NAME, SYM, PSEC,
457 and PVALUE. We set SYM_HASH to the hash table entry. We set
458 OVERRIDE if the old symbol is overriding a new definition. We set
459 TYPE_CHANGE_OK if it is OK for the type to change. We set
460 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
461 change, we mean that we shouldn't warn if the type or size does
462 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
466 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
467 override
, type_change_ok
, size_change_ok
, dt_needed
)
469 struct bfd_link_info
*info
;
471 Elf_Internal_Sym
*sym
;
474 struct elf_link_hash_entry
**sym_hash
;
475 bfd_boolean
*override
;
476 bfd_boolean
*type_change_ok
;
477 bfd_boolean
*size_change_ok
;
478 bfd_boolean dt_needed
;
481 struct elf_link_hash_entry
*h
;
484 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
489 bind
= ELF_ST_BIND (sym
->st_info
);
491 if (! bfd_is_und_section (sec
))
492 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
494 h
= ((struct elf_link_hash_entry
*)
495 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
500 /* This code is for coping with dynamic objects, and is only useful
501 if we are doing an ELF link. */
502 if (info
->hash
->creator
!= abfd
->xvec
)
505 /* For merging, we only care about real symbols. */
507 while (h
->root
.type
== bfd_link_hash_indirect
508 || h
->root
.type
== bfd_link_hash_warning
)
509 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
511 /* If we just created the symbol, mark it as being an ELF symbol.
512 Other than that, there is nothing to do--there is no merge issue
513 with a newly defined symbol--so we just return. */
515 if (h
->root
.type
== bfd_link_hash_new
)
517 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
521 /* OLDBFD is a BFD associated with the existing symbol. */
523 switch (h
->root
.type
)
529 case bfd_link_hash_undefined
:
530 case bfd_link_hash_undefweak
:
531 oldbfd
= h
->root
.u
.undef
.abfd
;
534 case bfd_link_hash_defined
:
535 case bfd_link_hash_defweak
:
536 oldbfd
= h
->root
.u
.def
.section
->owner
;
539 case bfd_link_hash_common
:
540 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
544 /* In cases involving weak versioned symbols, we may wind up trying
545 to merge a symbol with itself. Catch that here, to avoid the
546 confusion that results if we try to override a symbol with
547 itself. The additional tests catch cases like
548 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
549 dynamic object, which we do want to handle here. */
551 && ((abfd
->flags
& DYNAMIC
) == 0
552 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
555 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
556 respectively, is from a dynamic object. */
558 if ((abfd
->flags
& DYNAMIC
) != 0)
564 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
569 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
570 indices used by MIPS ELF. */
571 switch (h
->root
.type
)
577 case bfd_link_hash_defined
:
578 case bfd_link_hash_defweak
:
579 hsec
= h
->root
.u
.def
.section
;
582 case bfd_link_hash_common
:
583 hsec
= h
->root
.u
.c
.p
->section
;
590 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
593 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
594 respectively, appear to be a definition rather than reference. */
596 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
601 if (h
->root
.type
== bfd_link_hash_undefined
602 || h
->root
.type
== bfd_link_hash_undefweak
603 || h
->root
.type
== bfd_link_hash_common
)
608 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
609 symbol, respectively, appears to be a common symbol in a dynamic
610 object. If a symbol appears in an uninitialized section, and is
611 not weak, and is not a function, then it may be a common symbol
612 which was resolved when the dynamic object was created. We want
613 to treat such symbols specially, because they raise special
614 considerations when setting the symbol size: if the symbol
615 appears as a common symbol in a regular object, and the size in
616 the regular object is larger, we must make sure that we use the
617 larger size. This problematic case can always be avoided in C,
618 but it must be handled correctly when using Fortran shared
621 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
622 likewise for OLDDYNCOMMON and OLDDEF.
624 Note that this test is just a heuristic, and that it is quite
625 possible to have an uninitialized symbol in a shared object which
626 is really a definition, rather than a common symbol. This could
627 lead to some minor confusion when the symbol really is a common
628 symbol in some regular object. However, I think it will be
633 && (sec
->flags
& SEC_ALLOC
) != 0
634 && (sec
->flags
& SEC_LOAD
) == 0
637 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
640 newdyncommon
= FALSE
;
644 && h
->root
.type
== bfd_link_hash_defined
645 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
646 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
647 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
649 && h
->type
!= STT_FUNC
)
652 olddyncommon
= FALSE
;
654 /* It's OK to change the type if either the existing symbol or the
655 new symbol is weak unless it comes from a DT_NEEDED entry of
656 a shared object, in which case, the DT_NEEDED entry may not be
657 required at the run time. */
659 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
660 || h
->root
.type
== bfd_link_hash_undefweak
662 *type_change_ok
= TRUE
;
664 /* It's OK to change the size if either the existing symbol or the
665 new symbol is weak, or if the old symbol is undefined. */
668 || h
->root
.type
== bfd_link_hash_undefined
)
669 *size_change_ok
= TRUE
;
671 /* If both the old and the new symbols look like common symbols in a
672 dynamic object, set the size of the symbol to the larger of the
677 && sym
->st_size
!= h
->size
)
679 /* Since we think we have two common symbols, issue a multiple
680 common warning if desired. Note that we only warn if the
681 size is different. If the size is the same, we simply let
682 the old symbol override the new one as normally happens with
683 symbols defined in dynamic objects. */
685 if (! ((*info
->callbacks
->multiple_common
)
686 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
687 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
690 if (sym
->st_size
> h
->size
)
691 h
->size
= sym
->st_size
;
693 *size_change_ok
= TRUE
;
696 /* If we are looking at a dynamic object, and we have found a
697 definition, we need to see if the symbol was already defined by
698 some other object. If so, we want to use the existing
699 definition, and we do not want to report a multiple symbol
700 definition error; we do this by clobbering *PSEC to be
703 We treat a common symbol as a definition if the symbol in the
704 shared library is a function, since common symbols always
705 represent variables; this can cause confusion in principle, but
706 any such confusion would seem to indicate an erroneous program or
707 shared library. We also permit a common symbol in a regular
708 object to override a weak symbol in a shared object.
710 We prefer a non-weak definition in a shared library to a weak
711 definition in the executable unless it comes from a DT_NEEDED
712 entry of a shared object, in which case, the DT_NEEDED entry
713 may not be required at the run time. */
718 || (h
->root
.type
== bfd_link_hash_common
720 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
721 && (h
->root
.type
!= bfd_link_hash_defweak
723 || bind
== STB_WEAK
))
727 newdyncommon
= FALSE
;
729 *psec
= sec
= bfd_und_section_ptr
;
730 *size_change_ok
= TRUE
;
732 /* If we get here when the old symbol is a common symbol, then
733 we are explicitly letting it override a weak symbol or
734 function in a dynamic object, and we don't want to warn about
735 a type change. If the old symbol is a defined symbol, a type
736 change warning may still be appropriate. */
738 if (h
->root
.type
== bfd_link_hash_common
)
739 *type_change_ok
= TRUE
;
742 /* Handle the special case of an old common symbol merging with a
743 new symbol which looks like a common symbol in a shared object.
744 We change *PSEC and *PVALUE to make the new symbol look like a
745 common symbol, and let _bfd_generic_link_add_one_symbol will do
749 && h
->root
.type
== bfd_link_hash_common
)
753 newdyncommon
= FALSE
;
754 *pvalue
= sym
->st_size
;
755 *psec
= sec
= bfd_com_section_ptr
;
756 *size_change_ok
= TRUE
;
759 /* If the old symbol is from a dynamic object, and the new symbol is
760 a definition which is not from a dynamic object, then the new
761 symbol overrides the old symbol. Symbols from regular files
762 always take precedence over symbols from dynamic objects, even if
763 they are defined after the dynamic object in the link.
765 As above, we again permit a common symbol in a regular object to
766 override a definition in a shared object if the shared object
767 symbol is a function or is weak.
769 As above, we permit a non-weak definition in a shared object to
770 override a weak definition in a regular object. */
774 || (bfd_is_com_section (sec
)
775 && (h
->root
.type
== bfd_link_hash_defweak
776 || h
->type
== STT_FUNC
)))
779 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
781 || h
->root
.type
== bfd_link_hash_defweak
))
783 /* Change the hash table entry to undefined, and let
784 _bfd_generic_link_add_one_symbol do the right thing with the
787 h
->root
.type
= bfd_link_hash_undefined
;
788 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
789 *size_change_ok
= TRUE
;
792 olddyncommon
= FALSE
;
794 /* We again permit a type change when a common symbol may be
795 overriding a function. */
797 if (bfd_is_com_section (sec
))
798 *type_change_ok
= TRUE
;
800 /* This union may have been set to be non-NULL when this symbol
801 was seen in a dynamic object. We must force the union to be
802 NULL, so that it is correct for a regular symbol. */
804 h
->verinfo
.vertree
= NULL
;
806 /* In this special case, if H is the target of an indirection,
807 we want the caller to frob with H rather than with the
808 indirect symbol. That will permit the caller to redefine the
809 target of the indirection, rather than the indirect symbol
810 itself. FIXME: This will break the -y option if we store a
811 symbol with a different name. */
815 /* Handle the special case of a new common symbol merging with an
816 old symbol that looks like it might be a common symbol defined in
817 a shared object. Note that we have already handled the case in
818 which a new common symbol should simply override the definition
819 in the shared library. */
822 && bfd_is_com_section (sec
)
825 /* It would be best if we could set the hash table entry to a
826 common symbol, but we don't know what to use for the section
828 if (! ((*info
->callbacks
->multiple_common
)
829 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
830 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
833 /* If the predumed common symbol in the dynamic object is
834 larger, pretend that the new symbol has its size. */
836 if (h
->size
> *pvalue
)
839 /* FIXME: We no longer know the alignment required by the symbol
840 in the dynamic object, so we just wind up using the one from
841 the regular object. */
844 olddyncommon
= FALSE
;
846 h
->root
.type
= bfd_link_hash_undefined
;
847 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
849 *size_change_ok
= TRUE
;
850 *type_change_ok
= TRUE
;
852 h
->verinfo
.vertree
= NULL
;
855 /* Handle the special case of a weak definition in a regular object
856 followed by a non-weak definition in a shared object. In this
857 case, we prefer the definition in the shared object unless it
858 comes from a DT_NEEDED entry of a shared object, in which case,
859 the DT_NEEDED entry may not be required at the run time. */
862 && h
->root
.type
== bfd_link_hash_defweak
867 /* To make this work we have to frob the flags so that the rest
868 of the code does not think we are using the regular
870 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
871 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
872 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
873 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
874 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
875 | ELF_LINK_HASH_DEF_DYNAMIC
);
877 /* If H is the target of an indirection, we want the caller to
878 use H rather than the indirect symbol. Otherwise if we are
879 defining a new indirect symbol we will wind up attaching it
880 to the entry we are overriding. */
884 /* Handle the special case of a non-weak definition in a shared
885 object followed by a weak definition in a regular object. In
886 this case we prefer to definition in the shared object. To make
887 this work we have to tell the caller to not treat the new symbol
891 && h
->root
.type
!= bfd_link_hash_defweak
900 /* This function is called to create an indirect symbol from the
901 default for the symbol with the default version if needed. The
902 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
903 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
904 indicates if it comes from a DT_NEEDED entry of a shared object. */
907 elf_add_default_symbol (abfd
, info
, h
, name
, sym
, psec
, value
,
908 dynsym
, override
, dt_needed
)
910 struct bfd_link_info
*info
;
911 struct elf_link_hash_entry
*h
;
913 Elf_Internal_Sym
*sym
;
917 bfd_boolean override
;
918 bfd_boolean dt_needed
;
920 bfd_boolean type_change_ok
;
921 bfd_boolean size_change_ok
;
923 struct elf_link_hash_entry
*hi
;
924 struct bfd_link_hash_entry
*bh
;
925 struct elf_backend_data
*bed
;
929 size_t len
, shortlen
;
932 /* If this symbol has a version, and it is the default version, we
933 create an indirect symbol from the default name to the fully
934 decorated name. This will cause external references which do not
935 specify a version to be bound to this version of the symbol. */
936 p
= strchr (name
, ELF_VER_CHR
);
937 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
942 /* We are overridden by an old defition. We need to check if we
943 need to create the indirect symbol from the default name. */
944 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
946 BFD_ASSERT (hi
!= NULL
);
949 while (hi
->root
.type
== bfd_link_hash_indirect
950 || hi
->root
.type
== bfd_link_hash_warning
)
952 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
958 bed
= get_elf_backend_data (abfd
);
959 collect
= bed
->collect
;
960 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
963 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
964 if (shortname
== NULL
)
966 memcpy (shortname
, name
, shortlen
);
967 shortname
[shortlen
] = '\0';
969 /* We are going to create a new symbol. Merge it with any existing
970 symbol with this name. For the purposes of the merge, act as
971 though we were defining the symbol we just defined, although we
972 actually going to define an indirect symbol. */
973 type_change_ok
= FALSE
;
974 size_change_ok
= FALSE
;
976 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
977 &hi
, &override
, &type_change_ok
,
978 &size_change_ok
, dt_needed
))
984 if (! (_bfd_generic_link_add_one_symbol
985 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
986 (bfd_vma
) 0, name
, FALSE
, collect
, &bh
)))
988 hi
= (struct elf_link_hash_entry
*) bh
;
992 /* In this case the symbol named SHORTNAME is overriding the
993 indirect symbol we want to add. We were planning on making
994 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
995 is the name without a version. NAME is the fully versioned
996 name, and it is the default version.
998 Overriding means that we already saw a definition for the
999 symbol SHORTNAME in a regular object, and it is overriding
1000 the symbol defined in the dynamic object.
1002 When this happens, we actually want to change NAME, the
1003 symbol we just added, to refer to SHORTNAME. This will cause
1004 references to NAME in the shared object to become references
1005 to SHORTNAME in the regular object. This is what we expect
1006 when we override a function in a shared object: that the
1007 references in the shared object will be mapped to the
1008 definition in the regular object. */
1010 while (hi
->root
.type
== bfd_link_hash_indirect
1011 || hi
->root
.type
== bfd_link_hash_warning
)
1012 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1014 h
->root
.type
= bfd_link_hash_indirect
;
1015 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1016 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1018 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1019 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1020 if (hi
->elf_link_hash_flags
1021 & (ELF_LINK_HASH_REF_REGULAR
1022 | ELF_LINK_HASH_DEF_REGULAR
))
1024 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1029 /* Now set HI to H, so that the following code will set the
1030 other fields correctly. */
1034 /* If there is a duplicate definition somewhere, then HI may not
1035 point to an indirect symbol. We will have reported an error to
1036 the user in that case. */
1038 if (hi
->root
.type
== bfd_link_hash_indirect
)
1040 struct elf_link_hash_entry
*ht
;
1042 /* If the symbol became indirect, then we assume that we have
1043 not seen a definition before. */
1044 BFD_ASSERT ((hi
->elf_link_hash_flags
1045 & (ELF_LINK_HASH_DEF_DYNAMIC
1046 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1048 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1049 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, ht
, hi
);
1051 /* See if the new flags lead us to realize that the symbol must
1058 || ((hi
->elf_link_hash_flags
1059 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1064 if ((hi
->elf_link_hash_flags
1065 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1071 /* We also need to define an indirection from the nondefault version
1074 len
= strlen (name
);
1075 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1076 if (shortname
== NULL
)
1078 memcpy (shortname
, name
, shortlen
);
1079 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1081 /* Once again, merge with any existing symbol. */
1082 type_change_ok
= FALSE
;
1083 size_change_ok
= FALSE
;
1085 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1086 &hi
, &override
, &type_change_ok
,
1087 &size_change_ok
, dt_needed
))
1092 /* Here SHORTNAME is a versioned name, so we don't expect to see
1093 the type of override we do in the case above unless it is
1094 overridden by a versioned definiton. */
1095 if (hi
->root
.type
!= bfd_link_hash_defined
1096 && hi
->root
.type
!= bfd_link_hash_defweak
)
1097 (*_bfd_error_handler
)
1098 (_("%s: warning: unexpected redefinition of indirect versioned symbol `%s'"),
1099 bfd_archive_filename (abfd
), shortname
);
1104 if (! (_bfd_generic_link_add_one_symbol
1105 (info
, abfd
, shortname
, BSF_INDIRECT
,
1106 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, FALSE
, collect
, &bh
)))
1108 hi
= (struct elf_link_hash_entry
*) bh
;
1110 /* If there is a duplicate definition somewhere, then HI may not
1111 point to an indirect symbol. We will have reported an error
1112 to the user in that case. */
1114 if (hi
->root
.type
== bfd_link_hash_indirect
)
1116 /* If the symbol became indirect, then we assume that we have
1117 not seen a definition before. */
1118 BFD_ASSERT ((hi
->elf_link_hash_flags
1119 & (ELF_LINK_HASH_DEF_DYNAMIC
1120 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1122 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
1124 /* See if the new flags lead us to realize that the symbol
1131 || ((hi
->elf_link_hash_flags
1132 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1137 if ((hi
->elf_link_hash_flags
1138 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1148 /* Add symbols from an ELF object file to the linker hash table. */
1151 elf_link_add_object_symbols (abfd
, info
)
1153 struct bfd_link_info
*info
;
1155 bfd_boolean (*add_symbol_hook
)
1156 PARAMS ((bfd
*, struct bfd_link_info
*, const Elf_Internal_Sym
*,
1157 const char **, flagword
*, asection
**, bfd_vma
*));
1158 bfd_boolean (*check_relocs
)
1159 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1160 const Elf_Internal_Rela
*));
1161 bfd_boolean collect
;
1162 Elf_Internal_Shdr
*hdr
;
1163 bfd_size_type symcount
;
1164 bfd_size_type extsymcount
;
1165 bfd_size_type extsymoff
;
1166 struct elf_link_hash_entry
**sym_hash
;
1167 bfd_boolean dynamic
;
1168 Elf_External_Versym
*extversym
= NULL
;
1169 Elf_External_Versym
*ever
;
1170 struct elf_link_hash_entry
*weaks
;
1171 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
1172 bfd_size_type nondeflt_vers_cnt
= 0;
1173 Elf_Internal_Sym
*isymbuf
= NULL
;
1174 Elf_Internal_Sym
*isym
;
1175 Elf_Internal_Sym
*isymend
;
1176 struct elf_backend_data
*bed
;
1177 bfd_boolean dt_needed
;
1178 struct elf_link_hash_table
* hash_table
;
1181 hash_table
= elf_hash_table (info
);
1183 bed
= get_elf_backend_data (abfd
);
1184 add_symbol_hook
= bed
->elf_add_symbol_hook
;
1185 collect
= bed
->collect
;
1187 if ((abfd
->flags
& DYNAMIC
) == 0)
1193 /* You can't use -r against a dynamic object. Also, there's no
1194 hope of using a dynamic object which does not exactly match
1195 the format of the output file. */
1196 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
1198 bfd_set_error (bfd_error_invalid_operation
);
1203 /* As a GNU extension, any input sections which are named
1204 .gnu.warning.SYMBOL are treated as warning symbols for the given
1205 symbol. This differs from .gnu.warning sections, which generate
1206 warnings when they are included in an output file. */
1211 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1215 name
= bfd_get_section_name (abfd
, s
);
1216 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1221 name
+= sizeof ".gnu.warning." - 1;
1223 /* If this is a shared object, then look up the symbol
1224 in the hash table. If it is there, and it is already
1225 been defined, then we will not be using the entry
1226 from this shared object, so we don't need to warn.
1227 FIXME: If we see the definition in a regular object
1228 later on, we will warn, but we shouldn't. The only
1229 fix is to keep track of what warnings we are supposed
1230 to emit, and then handle them all at the end of the
1232 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
1234 struct elf_link_hash_entry
*h
;
1236 h
= elf_link_hash_lookup (hash_table
, name
,
1237 FALSE
, FALSE
, TRUE
);
1239 /* FIXME: What about bfd_link_hash_common? */
1241 && (h
->root
.type
== bfd_link_hash_defined
1242 || h
->root
.type
== bfd_link_hash_defweak
))
1244 /* We don't want to issue this warning. Clobber
1245 the section size so that the warning does not
1246 get copied into the output file. */
1252 sz
= bfd_section_size (abfd
, s
);
1253 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
1257 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
1262 if (! (_bfd_generic_link_add_one_symbol
1263 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
1264 FALSE
, collect
, (struct bfd_link_hash_entry
**) NULL
)))
1267 if (! info
->relocateable
)
1269 /* Clobber the section size so that the warning does
1270 not get copied into the output file. */
1280 /* If we are creating a shared library, create all the dynamic
1281 sections immediately. We need to attach them to something,
1282 so we attach them to this BFD, provided it is the right
1283 format. FIXME: If there are no input BFD's of the same
1284 format as the output, we can't make a shared library. */
1286 && is_elf_hash_table (info
)
1287 && ! hash_table
->dynamic_sections_created
1288 && abfd
->xvec
== info
->hash
->creator
)
1290 if (! elf_link_create_dynamic_sections (abfd
, info
))
1294 else if (! is_elf_hash_table (info
))
1299 bfd_boolean add_needed
;
1301 bfd_size_type oldsize
;
1302 bfd_size_type strindex
;
1303 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
1305 /* ld --just-symbols and dynamic objects don't mix very well.
1306 Test for --just-symbols by looking at info set up by
1307 _bfd_elf_link_just_syms. */
1308 if ((s
= abfd
->sections
) != NULL
1309 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
1312 /* Find the name to use in a DT_NEEDED entry that refers to this
1313 object. If the object has a DT_SONAME entry, we use it.
1314 Otherwise, if the generic linker stuck something in
1315 elf_dt_name, we use that. Otherwise, we just use the file
1316 name. If the generic linker put a null string into
1317 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1318 there is a DT_SONAME entry. */
1320 name
= bfd_get_filename (abfd
);
1321 if (elf_dt_name (abfd
) != NULL
)
1323 name
= elf_dt_name (abfd
);
1326 if (elf_dt_soname (abfd
) != NULL
)
1332 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1335 Elf_External_Dyn
*dynbuf
= NULL
;
1336 Elf_External_Dyn
*extdyn
;
1337 Elf_External_Dyn
*extdynend
;
1339 unsigned long shlink
;
1341 dynbuf
= (Elf_External_Dyn
*) bfd_malloc (s
->_raw_size
);
1345 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1346 (file_ptr
) 0, s
->_raw_size
))
1347 goto error_free_dyn
;
1349 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1351 goto error_free_dyn
;
1352 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1355 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1356 for (; extdyn
< extdynend
; extdyn
++)
1358 Elf_Internal_Dyn dyn
;
1360 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1361 if (dyn
.d_tag
== DT_SONAME
)
1363 unsigned int tagv
= dyn
.d_un
.d_val
;
1364 name
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1366 goto error_free_dyn
;
1368 if (dyn
.d_tag
== DT_NEEDED
)
1370 struct bfd_link_needed_list
*n
, **pn
;
1372 unsigned int tagv
= dyn
.d_un
.d_val
;
1374 amt
= sizeof (struct bfd_link_needed_list
);
1375 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1376 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1377 if (n
== NULL
|| fnm
== NULL
)
1378 goto error_free_dyn
;
1379 amt
= strlen (fnm
) + 1;
1380 anm
= bfd_alloc (abfd
, amt
);
1382 goto error_free_dyn
;
1383 memcpy (anm
, fnm
, (size_t) amt
);
1387 for (pn
= & hash_table
->needed
;
1393 if (dyn
.d_tag
== DT_RUNPATH
)
1395 struct bfd_link_needed_list
*n
, **pn
;
1397 unsigned int tagv
= dyn
.d_un
.d_val
;
1399 amt
= sizeof (struct bfd_link_needed_list
);
1400 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1401 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1402 if (n
== NULL
|| fnm
== NULL
)
1403 goto error_free_dyn
;
1404 amt
= strlen (fnm
) + 1;
1405 anm
= bfd_alloc (abfd
, amt
);
1407 goto error_free_dyn
;
1408 memcpy (anm
, fnm
, (size_t) amt
);
1412 for (pn
= & runpath
;
1418 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1419 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1421 struct bfd_link_needed_list
*n
, **pn
;
1423 unsigned int tagv
= dyn
.d_un
.d_val
;
1425 amt
= sizeof (struct bfd_link_needed_list
);
1426 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1427 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1428 if (n
== NULL
|| fnm
== NULL
)
1429 goto error_free_dyn
;
1430 amt
= strlen (fnm
) + 1;
1431 anm
= bfd_alloc (abfd
, amt
);
1438 memcpy (anm
, fnm
, (size_t) amt
);
1453 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
1454 frees all more recently bfd_alloc'd blocks as well. */
1460 struct bfd_link_needed_list
**pn
;
1461 for (pn
= & hash_table
->runpath
;
1468 /* We do not want to include any of the sections in a dynamic
1469 object in the output file. We hack by simply clobbering the
1470 list of sections in the BFD. This could be handled more
1471 cleanly by, say, a new section flag; the existing
1472 SEC_NEVER_LOAD flag is not the one we want, because that one
1473 still implies that the section takes up space in the output
1475 bfd_section_list_clear (abfd
);
1477 /* If this is the first dynamic object found in the link, create
1478 the special sections required for dynamic linking. */
1479 if (! hash_table
->dynamic_sections_created
)
1480 if (! elf_link_create_dynamic_sections (abfd
, info
))
1485 /* Add a DT_NEEDED entry for this dynamic object. */
1486 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
1487 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, name
, FALSE
);
1488 if (strindex
== (bfd_size_type
) -1)
1491 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
1494 Elf_External_Dyn
*dyncon
, *dynconend
;
1496 /* The hash table size did not change, which means that
1497 the dynamic object name was already entered. If we
1498 have already included this dynamic object in the
1499 link, just ignore it. There is no reason to include
1500 a particular dynamic object more than once. */
1501 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
1502 BFD_ASSERT (sdyn
!= NULL
);
1504 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1505 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1507 for (; dyncon
< dynconend
; dyncon
++)
1509 Elf_Internal_Dyn dyn
;
1511 elf_swap_dyn_in (hash_table
->dynobj
, dyncon
, & dyn
);
1512 if (dyn
.d_tag
== DT_NEEDED
1513 && dyn
.d_un
.d_val
== strindex
)
1515 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
1521 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
1525 /* Save the SONAME, if there is one, because sometimes the
1526 linker emulation code will need to know it. */
1528 name
= basename (bfd_get_filename (abfd
));
1529 elf_dt_name (abfd
) = name
;
1532 /* If this is a dynamic object, we always link against the .dynsym
1533 symbol table, not the .symtab symbol table. The dynamic linker
1534 will only see the .dynsym symbol table, so there is no reason to
1535 look at .symtab for a dynamic object. */
1537 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1538 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1540 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1542 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1544 /* The sh_info field of the symtab header tells us where the
1545 external symbols start. We don't care about the local symbols at
1547 if (elf_bad_symtab (abfd
))
1549 extsymcount
= symcount
;
1554 extsymcount
= symcount
- hdr
->sh_info
;
1555 extsymoff
= hdr
->sh_info
;
1559 if (extsymcount
!= 0)
1561 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
1563 if (isymbuf
== NULL
)
1566 /* We store a pointer to the hash table entry for each external
1568 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
1569 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
1570 if (sym_hash
== NULL
)
1571 goto error_free_sym
;
1572 elf_sym_hashes (abfd
) = sym_hash
;
1577 /* Read in any version definitions. */
1578 if (! _bfd_elf_slurp_version_tables (abfd
))
1579 goto error_free_sym
;
1581 /* Read in the symbol versions, but don't bother to convert them
1582 to internal format. */
1583 if (elf_dynversym (abfd
) != 0)
1585 Elf_Internal_Shdr
*versymhdr
;
1587 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1588 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
1589 if (extversym
== NULL
)
1590 goto error_free_sym
;
1591 amt
= versymhdr
->sh_size
;
1592 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1593 || bfd_bread ((PTR
) extversym
, amt
, abfd
) != amt
)
1594 goto error_free_vers
;
1600 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1601 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
1603 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1610 struct elf_link_hash_entry
*h
;
1611 bfd_boolean definition
;
1612 bfd_boolean size_change_ok
;
1613 bfd_boolean type_change_ok
;
1614 bfd_boolean new_weakdef
;
1615 bfd_boolean override
;
1616 unsigned int old_alignment
;
1621 flags
= BSF_NO_FLAGS
;
1623 value
= isym
->st_value
;
1626 bind
= ELF_ST_BIND (isym
->st_info
);
1627 if (bind
== STB_LOCAL
)
1629 /* This should be impossible, since ELF requires that all
1630 global symbols follow all local symbols, and that sh_info
1631 point to the first global symbol. Unfortunatealy, Irix 5
1635 else if (bind
== STB_GLOBAL
)
1637 if (isym
->st_shndx
!= SHN_UNDEF
1638 && isym
->st_shndx
!= SHN_COMMON
)
1641 else if (bind
== STB_WEAK
)
1645 /* Leave it up to the processor backend. */
1648 if (isym
->st_shndx
== SHN_UNDEF
)
1649 sec
= bfd_und_section_ptr
;
1650 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
1652 sec
= section_from_elf_index (abfd
, isym
->st_shndx
);
1654 sec
= bfd_abs_section_ptr
;
1655 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1658 else if (isym
->st_shndx
== SHN_ABS
)
1659 sec
= bfd_abs_section_ptr
;
1660 else if (isym
->st_shndx
== SHN_COMMON
)
1662 sec
= bfd_com_section_ptr
;
1663 /* What ELF calls the size we call the value. What ELF
1664 calls the value we call the alignment. */
1665 value
= isym
->st_size
;
1669 /* Leave it up to the processor backend. */
1672 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
1674 if (name
== (const char *) NULL
)
1675 goto error_free_vers
;
1677 if (isym
->st_shndx
== SHN_COMMON
1678 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
1680 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
1684 tcomm
= bfd_make_section (abfd
, ".tcommon");
1686 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
1688 | SEC_LINKER_CREATED
1689 | SEC_THREAD_LOCAL
)))
1690 goto error_free_vers
;
1694 else if (add_symbol_hook
)
1696 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
1698 goto error_free_vers
;
1700 /* The hook function sets the name to NULL if this symbol
1701 should be skipped for some reason. */
1702 if (name
== (const char *) NULL
)
1706 /* Sanity check that all possibilities were handled. */
1707 if (sec
== (asection
*) NULL
)
1709 bfd_set_error (bfd_error_bad_value
);
1710 goto error_free_vers
;
1713 if (bfd_is_und_section (sec
)
1714 || bfd_is_com_section (sec
))
1719 size_change_ok
= FALSE
;
1720 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1724 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1726 Elf_Internal_Versym iver
;
1727 unsigned int vernum
= 0;
1731 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1732 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1734 /* If this is a hidden symbol, or if it is not version
1735 1, we append the version name to the symbol name.
1736 However, we do not modify a non-hidden absolute
1737 symbol, because it might be the version symbol
1738 itself. FIXME: What if it isn't? */
1739 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1740 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1743 size_t namelen
, verlen
, newlen
;
1746 if (isym
->st_shndx
!= SHN_UNDEF
)
1748 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1750 (*_bfd_error_handler
)
1751 (_("%s: %s: invalid version %u (max %d)"),
1752 bfd_archive_filename (abfd
), name
, vernum
,
1753 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1754 bfd_set_error (bfd_error_bad_value
);
1755 goto error_free_vers
;
1757 else if (vernum
> 1)
1759 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1765 /* We cannot simply test for the number of
1766 entries in the VERNEED section since the
1767 numbers for the needed versions do not start
1769 Elf_Internal_Verneed
*t
;
1772 for (t
= elf_tdata (abfd
)->verref
;
1776 Elf_Internal_Vernaux
*a
;
1778 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1780 if (a
->vna_other
== vernum
)
1782 verstr
= a
->vna_nodename
;
1791 (*_bfd_error_handler
)
1792 (_("%s: %s: invalid needed version %d"),
1793 bfd_archive_filename (abfd
), name
, vernum
);
1794 bfd_set_error (bfd_error_bad_value
);
1795 goto error_free_vers
;
1799 namelen
= strlen (name
);
1800 verlen
= strlen (verstr
);
1801 newlen
= namelen
+ verlen
+ 2;
1802 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1803 && isym
->st_shndx
!= SHN_UNDEF
)
1806 newname
= (char *) bfd_alloc (abfd
, (bfd_size_type
) newlen
);
1807 if (newname
== NULL
)
1808 goto error_free_vers
;
1809 memcpy (newname
, name
, namelen
);
1810 p
= newname
+ namelen
;
1812 /* If this is a defined non-hidden version symbol,
1813 we add another @ to the name. This indicates the
1814 default version of the symbol. */
1815 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1816 && isym
->st_shndx
!= SHN_UNDEF
)
1818 memcpy (p
, verstr
, verlen
+ 1);
1824 if (! elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
1825 sym_hash
, &override
, &type_change_ok
,
1826 &size_change_ok
, dt_needed
))
1827 goto error_free_vers
;
1833 while (h
->root
.type
== bfd_link_hash_indirect
1834 || h
->root
.type
== bfd_link_hash_warning
)
1835 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1837 /* Remember the old alignment if this is a common symbol, so
1838 that we don't reduce the alignment later on. We can't
1839 check later, because _bfd_generic_link_add_one_symbol
1840 will set a default for the alignment which we want to
1841 override. We also remember the old bfd where the existing
1842 definition comes from. */
1843 switch (h
->root
.type
)
1848 case bfd_link_hash_defined
:
1849 case bfd_link_hash_defweak
:
1850 old_bfd
= h
->root
.u
.def
.section
->owner
;
1853 case bfd_link_hash_common
:
1854 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
1855 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1859 if (elf_tdata (abfd
)->verdef
!= NULL
1863 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1866 if (! (_bfd_generic_link_add_one_symbol
1867 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1868 FALSE
, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1869 goto error_free_vers
;
1872 while (h
->root
.type
== bfd_link_hash_indirect
1873 || h
->root
.type
== bfd_link_hash_warning
)
1874 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1877 new_weakdef
= FALSE
;
1880 && (flags
& BSF_WEAK
) != 0
1881 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
1882 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1883 && h
->weakdef
== NULL
)
1885 /* Keep a list of all weak defined non function symbols from
1886 a dynamic object, using the weakdef field. Later in this
1887 function we will set the weakdef field to the correct
1888 value. We only put non-function symbols from dynamic
1889 objects on this list, because that happens to be the only
1890 time we need to know the normal symbol corresponding to a
1891 weak symbol, and the information is time consuming to
1892 figure out. If the weakdef field is not already NULL,
1893 then this symbol was already defined by some previous
1894 dynamic object, and we will be using that previous
1895 definition anyhow. */
1902 /* Set the alignment of a common symbol. */
1903 if (isym
->st_shndx
== SHN_COMMON
1904 && h
->root
.type
== bfd_link_hash_common
)
1908 align
= bfd_log2 (isym
->st_value
);
1909 if (align
> old_alignment
1910 /* Permit an alignment power of zero if an alignment of one
1911 is specified and no other alignments have been specified. */
1912 || (isym
->st_value
== 1 && old_alignment
== 0))
1913 h
->root
.u
.c
.p
->alignment_power
= align
;
1915 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
1918 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1924 /* Check the alignment when a common symbol is involved. This
1925 can change when a common symbol is overriden by a normal
1926 definition or a common symbol is ignored due to the old
1927 normal definition. We need to make sure the maximum
1928 alignment is maintained. */
1929 if ((old_alignment
|| isym
->st_shndx
== SHN_COMMON
)
1930 && h
->root
.type
!= bfd_link_hash_common
)
1932 unsigned int common_align
, normal_align
, symbol_align
;
1934 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
1935 if ((h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
1937 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
1938 if (normal_align
> symbol_align
)
1939 normal_align
= symbol_align
;
1942 normal_align
= symbol_align
;
1945 common_align
= old_alignment
;
1947 common_align
= bfd_log2 (isym
->st_value
);
1949 if (normal_align
< common_align
)
1950 (*_bfd_error_handler
)
1951 (_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
1952 1 << normal_align
, name
,
1953 bfd_archive_filename (old_bfd
),
1954 1 << common_align
, bfd_archive_filename (abfd
));
1957 /* Remember the symbol size and type. */
1958 if (isym
->st_size
!= 0
1959 && (definition
|| h
->size
== 0))
1961 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
1962 (*_bfd_error_handler
)
1963 (_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
1964 name
, (unsigned long) h
->size
,
1965 bfd_archive_filename (old_bfd
),
1966 (unsigned long) isym
->st_size
,
1967 bfd_archive_filename (abfd
));
1969 h
->size
= isym
->st_size
;
1972 /* If this is a common symbol, then we always want H->SIZE
1973 to be the size of the common symbol. The code just above
1974 won't fix the size if a common symbol becomes larger. We
1975 don't warn about a size change here, because that is
1976 covered by --warn-common. */
1977 if (h
->root
.type
== bfd_link_hash_common
)
1978 h
->size
= h
->root
.u
.c
.size
;
1980 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
1981 && (definition
|| h
->type
== STT_NOTYPE
))
1983 if (h
->type
!= STT_NOTYPE
1984 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
1985 && ! type_change_ok
)
1986 (*_bfd_error_handler
)
1987 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1988 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
1989 bfd_archive_filename (abfd
));
1991 h
->type
= ELF_ST_TYPE (isym
->st_info
);
1994 /* If st_other has a processor-specific meaning, specific code
1995 might be needed here. */
1996 if (isym
->st_other
!= 0)
1998 unsigned char hvis
, symvis
, other
, nvis
;
2000 /* Take the balance of OTHER from the definition. */
2001 other
= (definition
? isym
->st_other
: h
->other
);
2002 other
&= ~ ELF_ST_VISIBILITY (-1);
2004 /* Combine visibilities, using the most constraining one. */
2005 hvis
= ELF_ST_VISIBILITY (h
->other
);
2006 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
2012 nvis
= hvis
< symvis
? hvis
: symvis
;
2014 h
->other
= other
| nvis
;
2017 /* Set a flag in the hash table entry indicating the type of
2018 reference or definition we just found. Keep a count of
2019 the number of dynamic symbols we find. A dynamic symbol
2020 is one which is referenced or defined by both a regular
2021 object and a shared object. */
2022 old_flags
= h
->elf_link_hash_flags
;
2028 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
2029 if (bind
!= STB_WEAK
)
2030 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
2033 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
2035 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2036 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
2042 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
2044 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
2045 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
2046 | ELF_LINK_HASH_REF_REGULAR
)) != 0
2047 || (h
->weakdef
!= NULL
2049 && h
->weakdef
->dynindx
!= -1))
2053 h
->elf_link_hash_flags
|= new_flag
;
2055 /* Check to see if we need to add an indirect symbol for
2056 the default name. */
2057 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
2058 if (! elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
2059 &sec
, &value
, &dynsym
,
2060 override
, dt_needed
))
2061 goto error_free_vers
;
2063 if (definition
&& (abfd
->flags
& DYNAMIC
) == 0)
2065 char *p
= strchr (name
, ELF_VER_CHR
);
2066 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
2068 /* Queue non-default versions so that .symver x, x@FOO
2069 aliases can be checked. */
2070 if (! nondeflt_vers
)
2072 amt
= (isymend
- isym
+ 1)
2073 * sizeof (struct elf_link_hash_entry
*);
2074 nondeflt_vers
= bfd_malloc (amt
);
2076 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
2080 if (dynsym
&& h
->dynindx
== -1)
2082 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2083 goto error_free_vers
;
2084 if (h
->weakdef
!= NULL
2086 && h
->weakdef
->dynindx
== -1)
2088 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2089 goto error_free_vers
;
2092 else if (dynsym
&& h
->dynindx
!= -1)
2093 /* If the symbol already has a dynamic index, but
2094 visibility says it should not be visible, turn it into
2096 switch (ELF_ST_VISIBILITY (h
->other
))
2100 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2104 if (dt_needed
&& definition
2105 && (h
->elf_link_hash_flags
2106 & ELF_LINK_HASH_REF_REGULAR
) != 0)
2108 bfd_size_type oldsize
;
2109 bfd_size_type strindex
;
2111 if (! is_elf_hash_table (info
))
2112 goto error_free_vers
;
2114 /* The symbol from a DT_NEEDED object is referenced from
2115 the regular object to create a dynamic executable. We
2116 have to make sure there is a DT_NEEDED entry for it. */
2119 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2120 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
,
2121 elf_dt_soname (abfd
), FALSE
);
2122 if (strindex
== (bfd_size_type
) -1)
2123 goto error_free_vers
;
2125 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2128 Elf_External_Dyn
*dyncon
, *dynconend
;
2130 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
,
2132 BFD_ASSERT (sdyn
!= NULL
);
2134 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
2135 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
2137 for (; dyncon
< dynconend
; dyncon
++)
2139 Elf_Internal_Dyn dyn
;
2141 elf_swap_dyn_in (hash_table
->dynobj
,
2143 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
2144 dyn
.d_un
.d_val
!= strindex
);
2148 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
2149 goto error_free_vers
;
2154 /* Now that all the symbols from this input file are created, handle
2155 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
2156 if (nondeflt_vers
!= NULL
)
2158 bfd_size_type cnt
, symidx
;
2160 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
2162 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
2163 char *shortname
, *p
;
2165 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2167 || (h
->root
.type
!= bfd_link_hash_defined
2168 && h
->root
.type
!= bfd_link_hash_defweak
))
2171 amt
= p
- h
->root
.root
.string
;
2172 shortname
= bfd_malloc (amt
+ 1);
2173 memcpy (shortname
, h
->root
.root
.string
, amt
);
2174 shortname
[amt
] = '\0';
2176 hi
= (struct elf_link_hash_entry
*)
2177 bfd_link_hash_lookup (info
->hash
, shortname
,
2178 FALSE
, FALSE
, FALSE
);
2180 && hi
->root
.type
== h
->root
.type
2181 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
2182 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
2184 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
2185 hi
->root
.type
= bfd_link_hash_indirect
;
2186 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
2187 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, h
, hi
);
2188 sym_hash
= elf_sym_hashes (abfd
);
2190 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
2191 if (sym_hash
[symidx
] == hi
)
2193 sym_hash
[symidx
] = h
;
2199 free (nondeflt_vers
);
2200 nondeflt_vers
= NULL
;
2203 if (extversym
!= NULL
)
2209 if (isymbuf
!= NULL
)
2213 /* Now set the weakdefs field correctly for all the weak defined
2214 symbols we found. The only way to do this is to search all the
2215 symbols. Since we only need the information for non functions in
2216 dynamic objects, that's the only time we actually put anything on
2217 the list WEAKS. We need this information so that if a regular
2218 object refers to a symbol defined weakly in a dynamic object, the
2219 real symbol in the dynamic object is also put in the dynamic
2220 symbols; we also must arrange for both symbols to point to the
2221 same memory location. We could handle the general case of symbol
2222 aliasing, but a general symbol alias can only be generated in
2223 assembler code, handling it correctly would be very time
2224 consuming, and other ELF linkers don't handle general aliasing
2226 while (weaks
!= NULL
)
2228 struct elf_link_hash_entry
*hlook
;
2231 struct elf_link_hash_entry
**hpp
;
2232 struct elf_link_hash_entry
**hppend
;
2235 weaks
= hlook
->weakdef
;
2236 hlook
->weakdef
= NULL
;
2238 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2239 || hlook
->root
.type
== bfd_link_hash_defweak
2240 || hlook
->root
.type
== bfd_link_hash_common
2241 || hlook
->root
.type
== bfd_link_hash_indirect
);
2242 slook
= hlook
->root
.u
.def
.section
;
2243 vlook
= hlook
->root
.u
.def
.value
;
2245 hpp
= elf_sym_hashes (abfd
);
2246 hppend
= hpp
+ extsymcount
;
2247 for (; hpp
< hppend
; hpp
++)
2249 struct elf_link_hash_entry
*h
;
2252 if (h
!= NULL
&& h
!= hlook
2253 && h
->root
.type
== bfd_link_hash_defined
2254 && h
->root
.u
.def
.section
== slook
2255 && h
->root
.u
.def
.value
== vlook
)
2259 /* If the weak definition is in the list of dynamic
2260 symbols, make sure the real definition is put there
2262 if (hlook
->dynindx
!= -1
2263 && h
->dynindx
== -1)
2265 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2269 /* If the real definition is in the list of dynamic
2270 symbols, make sure the weak definition is put there
2271 as well. If we don't do this, then the dynamic
2272 loader might not merge the entries for the real
2273 definition and the weak definition. */
2274 if (h
->dynindx
!= -1
2275 && hlook
->dynindx
== -1)
2277 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2285 /* If this object is the same format as the output object, and it is
2286 not a shared library, then let the backend look through the
2289 This is required to build global offset table entries and to
2290 arrange for dynamic relocs. It is not required for the
2291 particular common case of linking non PIC code, even when linking
2292 against shared libraries, but unfortunately there is no way of
2293 knowing whether an object file has been compiled PIC or not.
2294 Looking through the relocs is not particularly time consuming.
2295 The problem is that we must either (1) keep the relocs in memory,
2296 which causes the linker to require additional runtime memory or
2297 (2) read the relocs twice from the input file, which wastes time.
2298 This would be a good case for using mmap.
2300 I have no idea how to handle linking PIC code into a file of a
2301 different format. It probably can't be done. */
2302 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2304 && abfd
->xvec
== info
->hash
->creator
2305 && check_relocs
!= NULL
)
2309 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2311 Elf_Internal_Rela
*internal_relocs
;
2314 if ((o
->flags
& SEC_RELOC
) == 0
2315 || o
->reloc_count
== 0
2316 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2317 && (o
->flags
& SEC_DEBUGGING
) != 0)
2318 || bfd_is_abs_section (o
->output_section
))
2321 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2322 (abfd
, o
, (PTR
) NULL
,
2323 (Elf_Internal_Rela
*) NULL
,
2324 info
->keep_memory
));
2325 if (internal_relocs
== NULL
)
2328 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2330 if (elf_section_data (o
)->relocs
!= internal_relocs
)
2331 free (internal_relocs
);
2338 /* If this is a non-traditional link, try to optimize the handling
2339 of the .stab/.stabstr sections. */
2341 && ! info
->traditional_format
2342 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2343 && is_elf_hash_table (info
)
2344 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2346 asection
*stab
, *stabstr
;
2348 stab
= bfd_get_section_by_name (abfd
, ".stab");
2350 && (stab
->flags
& SEC_MERGE
) == 0
2351 && !bfd_is_abs_section (stab
->output_section
))
2353 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2355 if (stabstr
!= NULL
)
2357 struct bfd_elf_section_data
*secdata
;
2359 secdata
= elf_section_data (stab
);
2360 if (! _bfd_link_section_stabs (abfd
,
2361 & hash_table
->stab_info
,
2363 &secdata
->sec_info
))
2365 if (secdata
->sec_info
)
2366 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
2371 if (! info
->relocateable
&& ! dynamic
2372 && is_elf_hash_table (info
))
2376 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2377 if ((s
->flags
& SEC_MERGE
) != 0
2378 && !bfd_is_abs_section (s
->output_section
))
2380 struct bfd_elf_section_data
*secdata
;
2382 secdata
= elf_section_data (s
);
2383 if (! _bfd_merge_section (abfd
,
2384 & hash_table
->merge_info
,
2385 s
, &secdata
->sec_info
))
2387 else if (secdata
->sec_info
)
2388 s
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
2392 if (is_elf_hash_table (info
))
2394 /* Add this bfd to the loaded list. */
2395 struct elf_link_loaded_list
*n
;
2397 n
= ((struct elf_link_loaded_list
*)
2398 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
)));
2402 n
->next
= hash_table
->loaded
;
2403 hash_table
->loaded
= n
;
2409 if (nondeflt_vers
!= NULL
)
2410 free (nondeflt_vers
);
2411 if (extversym
!= NULL
)
2414 if (isymbuf
!= NULL
)
2420 /* Create some sections which will be filled in with dynamic linking
2421 information. ABFD is an input file which requires dynamic sections
2422 to be created. The dynamic sections take up virtual memory space
2423 when the final executable is run, so we need to create them before
2424 addresses are assigned to the output sections. We work out the
2425 actual contents and size of these sections later. */
2428 elf_link_create_dynamic_sections (abfd
, info
)
2430 struct bfd_link_info
*info
;
2433 register asection
*s
;
2434 struct elf_link_hash_entry
*h
;
2435 struct bfd_link_hash_entry
*bh
;
2436 struct elf_backend_data
*bed
;
2438 if (! is_elf_hash_table (info
))
2441 if (elf_hash_table (info
)->dynamic_sections_created
)
2444 /* Make sure that all dynamic sections use the same input BFD. */
2445 if (elf_hash_table (info
)->dynobj
== NULL
)
2446 elf_hash_table (info
)->dynobj
= abfd
;
2448 abfd
= elf_hash_table (info
)->dynobj
;
2450 /* Note that we set the SEC_IN_MEMORY flag for all of these
2452 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2453 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2455 /* A dynamically linked executable has a .interp section, but a
2456 shared library does not. */
2459 s
= bfd_make_section (abfd
, ".interp");
2461 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2465 if (! info
->traditional_format
2466 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
2468 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
2470 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2471 || ! bfd_set_section_alignment (abfd
, s
, 2))
2473 elf_hash_table (info
)->eh_info
.hdr_sec
= s
;
2476 /* Create sections to hold version informations. These are removed
2477 if they are not needed. */
2478 s
= bfd_make_section (abfd
, ".gnu.version_d");
2480 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2481 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2484 s
= bfd_make_section (abfd
, ".gnu.version");
2486 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2487 || ! bfd_set_section_alignment (abfd
, s
, 1))
2490 s
= bfd_make_section (abfd
, ".gnu.version_r");
2492 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2493 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2496 s
= bfd_make_section (abfd
, ".dynsym");
2498 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2499 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2502 s
= bfd_make_section (abfd
, ".dynstr");
2504 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2507 /* Create a strtab to hold the dynamic symbol names. */
2508 if (elf_hash_table (info
)->dynstr
== NULL
)
2510 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
2511 if (elf_hash_table (info
)->dynstr
== NULL
)
2515 s
= bfd_make_section (abfd
, ".dynamic");
2517 || ! bfd_set_section_flags (abfd
, s
, flags
)
2518 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2521 /* The special symbol _DYNAMIC is always set to the start of the
2522 .dynamic section. This call occurs before we have processed the
2523 symbols for any dynamic object, so we don't have to worry about
2524 overriding a dynamic definition. We could set _DYNAMIC in a
2525 linker script, but we only want to define it if we are, in fact,
2526 creating a .dynamic section. We don't want to define it if there
2527 is no .dynamic section, since on some ELF platforms the start up
2528 code examines it to decide how to initialize the process. */
2530 if (! (_bfd_generic_link_add_one_symbol
2531 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2532 (const char *) 0, FALSE
, get_elf_backend_data (abfd
)->collect
, &bh
)))
2534 h
= (struct elf_link_hash_entry
*) bh
;
2535 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2536 h
->type
= STT_OBJECT
;
2539 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2542 bed
= get_elf_backend_data (abfd
);
2544 s
= bfd_make_section (abfd
, ".hash");
2546 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2547 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2549 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2551 /* Let the backend create the rest of the sections. This lets the
2552 backend set the right flags. The backend will normally create
2553 the .got and .plt sections. */
2554 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2557 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
2562 /* Add an entry to the .dynamic table. */
2565 elf_add_dynamic_entry (info
, tag
, val
)
2566 struct bfd_link_info
*info
;
2570 Elf_Internal_Dyn dyn
;
2573 bfd_size_type newsize
;
2574 bfd_byte
*newcontents
;
2576 if (! is_elf_hash_table (info
))
2579 dynobj
= elf_hash_table (info
)->dynobj
;
2581 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2582 BFD_ASSERT (s
!= NULL
);
2584 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2585 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2586 if (newcontents
== NULL
)
2590 dyn
.d_un
.d_val
= val
;
2591 elf_swap_dyn_out (dynobj
, &dyn
,
2592 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2594 s
->_raw_size
= newsize
;
2595 s
->contents
= newcontents
;
2600 /* Read and swap the relocs from the section indicated by SHDR. This
2601 may be either a REL or a RELA section. The relocations are
2602 translated into RELA relocations and stored in INTERNAL_RELOCS,
2603 which should have already been allocated to contain enough space.
2604 The EXTERNAL_RELOCS are a buffer where the external form of the
2605 relocations should be stored.
2607 Returns FALSE if something goes wrong. */
2610 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2613 Elf_Internal_Shdr
*shdr
;
2614 PTR external_relocs
;
2615 Elf_Internal_Rela
*internal_relocs
;
2617 struct elf_backend_data
*bed
;
2618 void (*swap_in
) PARAMS ((bfd
*, const bfd_byte
*, Elf_Internal_Rela
*));
2619 const bfd_byte
*erela
;
2620 const bfd_byte
*erelaend
;
2621 Elf_Internal_Rela
*irela
;
2623 /* If there aren't any relocations, that's OK. */
2627 /* Position ourselves at the start of the section. */
2628 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2631 /* Read the relocations. */
2632 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2635 bed
= get_elf_backend_data (abfd
);
2637 /* Convert the external relocations to the internal format. */
2638 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2639 swap_in
= bed
->s
->swap_reloc_in
;
2640 else if (shdr
->sh_entsize
== sizeof (Elf_External_Rela
))
2641 swap_in
= bed
->s
->swap_reloca_in
;
2644 bfd_set_error (bfd_error_wrong_format
);
2648 erela
= external_relocs
;
2649 erelaend
= erela
+ NUM_SHDR_ENTRIES (shdr
) * shdr
->sh_entsize
;
2650 irela
= internal_relocs
;
2651 while (erela
< erelaend
)
2653 (*swap_in
) (abfd
, erela
, irela
);
2654 irela
+= bed
->s
->int_rels_per_ext_rel
;
2655 erela
+= shdr
->sh_entsize
;
2661 /* Read and swap the relocs for a section O. They may have been
2662 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2663 not NULL, they are used as buffers to read into. They are known to
2664 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2665 the return value is allocated using either malloc or bfd_alloc,
2666 according to the KEEP_MEMORY argument. If O has two relocation
2667 sections (both REL and RELA relocations), then the REL_HDR
2668 relocations will appear first in INTERNAL_RELOCS, followed by the
2669 REL_HDR2 relocations. */
2672 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2676 PTR external_relocs
;
2677 Elf_Internal_Rela
*internal_relocs
;
2678 bfd_boolean keep_memory
;
2680 Elf_Internal_Shdr
*rel_hdr
;
2682 Elf_Internal_Rela
*alloc2
= NULL
;
2683 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2685 if (elf_section_data (o
)->relocs
!= NULL
)
2686 return elf_section_data (o
)->relocs
;
2688 if (o
->reloc_count
== 0)
2691 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2693 if (internal_relocs
== NULL
)
2697 size
= o
->reloc_count
;
2698 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2700 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2702 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2703 if (internal_relocs
== NULL
)
2707 if (external_relocs
== NULL
)
2709 bfd_size_type size
= rel_hdr
->sh_size
;
2711 if (elf_section_data (o
)->rel_hdr2
)
2712 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2713 alloc1
= (PTR
) bfd_malloc (size
);
2716 external_relocs
= alloc1
;
2719 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2723 if (!elf_link_read_relocs_from_section
2725 elf_section_data (o
)->rel_hdr2
,
2726 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2727 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2728 * bed
->s
->int_rels_per_ext_rel
)))
2731 /* Cache the results for next time, if we can. */
2733 elf_section_data (o
)->relocs
= internal_relocs
;
2738 /* Don't free alloc2, since if it was allocated we are passing it
2739 back (under the name of internal_relocs). */
2741 return internal_relocs
;
2751 /* Record an assignment to a symbol made by a linker script. We need
2752 this in case some dynamic object refers to this symbol. */
2755 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2756 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2757 struct bfd_link_info
*info
;
2759 bfd_boolean provide
;
2761 struct elf_link_hash_entry
*h
;
2763 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2766 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, TRUE
, FALSE
);
2770 if (h
->root
.type
== bfd_link_hash_new
)
2771 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
2773 /* If this symbol is being provided by the linker script, and it is
2774 currently defined by a dynamic object, but not by a regular
2775 object, then mark it as undefined so that the generic linker will
2776 force the correct value. */
2778 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2779 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2780 h
->root
.type
= bfd_link_hash_undefined
;
2782 /* If this symbol is not being provided by the linker script, and it is
2783 currently defined by a dynamic object, but not by a regular object,
2784 then clear out any version information because the symbol will not be
2785 associated with the dynamic object any more. */
2787 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2788 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2789 h
->verinfo
.verdef
= NULL
;
2791 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2793 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2794 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2796 && h
->dynindx
== -1)
2798 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2801 /* If this is a weak defined symbol, and we know a corresponding
2802 real symbol from the same dynamic object, make sure the real
2803 symbol is also made into a dynamic symbol. */
2804 if (h
->weakdef
!= NULL
2805 && h
->weakdef
->dynindx
== -1)
2807 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2815 /* This structure is used to pass information to
2816 elf_link_assign_sym_version. */
2818 struct elf_assign_sym_version_info
2822 /* General link information. */
2823 struct bfd_link_info
*info
;
2825 struct bfd_elf_version_tree
*verdefs
;
2826 /* Whether we had a failure. */
2830 /* This structure is used to pass information to
2831 elf_link_find_version_dependencies. */
2833 struct elf_find_verdep_info
2837 /* General link information. */
2838 struct bfd_link_info
*info
;
2839 /* The number of dependencies. */
2841 /* Whether we had a failure. */
2845 /* Array used to determine the number of hash table buckets to use
2846 based on the number of symbols there are. If there are fewer than
2847 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2848 fewer than 37 we use 17 buckets, and so forth. We never use more
2849 than 32771 buckets. */
2851 static const size_t elf_buckets
[] =
2853 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2857 /* Compute bucket count for hashing table. We do not use a static set
2858 of possible tables sizes anymore. Instead we determine for all
2859 possible reasonable sizes of the table the outcome (i.e., the
2860 number of collisions etc) and choose the best solution. The
2861 weighting functions are not too simple to allow the table to grow
2862 without bounds. Instead one of the weighting factors is the size.
2863 Therefore the result is always a good payoff between few collisions
2864 (= short chain lengths) and table size. */
2866 compute_bucket_count (info
)
2867 struct bfd_link_info
*info
;
2869 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2870 size_t best_size
= 0;
2871 unsigned long int *hashcodes
;
2872 unsigned long int *hashcodesp
;
2873 unsigned long int i
;
2876 /* Compute the hash values for all exported symbols. At the same
2877 time store the values in an array so that we could use them for
2880 amt
*= sizeof (unsigned long int);
2881 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
2882 if (hashcodes
== NULL
)
2884 hashcodesp
= hashcodes
;
2886 /* Put all hash values in HASHCODES. */
2887 elf_link_hash_traverse (elf_hash_table (info
),
2888 elf_collect_hash_codes
, &hashcodesp
);
2890 /* We have a problem here. The following code to optimize the table
2891 size requires an integer type with more the 32 bits. If
2892 BFD_HOST_U_64_BIT is set we know about such a type. */
2893 #ifdef BFD_HOST_U_64_BIT
2896 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2899 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2900 unsigned long int *counts
;
2902 /* Possible optimization parameters: if we have NSYMS symbols we say
2903 that the hashing table must at least have NSYMS/4 and at most
2905 minsize
= nsyms
/ 4;
2908 best_size
= maxsize
= nsyms
* 2;
2910 /* Create array where we count the collisions in. We must use bfd_malloc
2911 since the size could be large. */
2913 amt
*= sizeof (unsigned long int);
2914 counts
= (unsigned long int *) bfd_malloc (amt
);
2921 /* Compute the "optimal" size for the hash table. The criteria is a
2922 minimal chain length. The minor criteria is (of course) the size
2924 for (i
= minsize
; i
< maxsize
; ++i
)
2926 /* Walk through the array of hashcodes and count the collisions. */
2927 BFD_HOST_U_64_BIT max
;
2928 unsigned long int j
;
2929 unsigned long int fact
;
2931 memset (counts
, '\0', i
* sizeof (unsigned long int));
2933 /* Determine how often each hash bucket is used. */
2934 for (j
= 0; j
< nsyms
; ++j
)
2935 ++counts
[hashcodes
[j
] % i
];
2937 /* For the weight function we need some information about the
2938 pagesize on the target. This is information need not be 100%
2939 accurate. Since this information is not available (so far) we
2940 define it here to a reasonable default value. If it is crucial
2941 to have a better value some day simply define this value. */
2942 # ifndef BFD_TARGET_PAGESIZE
2943 # define BFD_TARGET_PAGESIZE (4096)
2946 /* We in any case need 2 + NSYMS entries for the size values and
2948 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2951 /* Variant 1: optimize for short chains. We add the squares
2952 of all the chain lengths (which favous many small chain
2953 over a few long chains). */
2954 for (j
= 0; j
< i
; ++j
)
2955 max
+= counts
[j
] * counts
[j
];
2957 /* This adds penalties for the overall size of the table. */
2958 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2961 /* Variant 2: Optimize a lot more for small table. Here we
2962 also add squares of the size but we also add penalties for
2963 empty slots (the +1 term). */
2964 for (j
= 0; j
< i
; ++j
)
2965 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2967 /* The overall size of the table is considered, but not as
2968 strong as in variant 1, where it is squared. */
2969 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2973 /* Compare with current best results. */
2974 if (max
< best_chlen
)
2984 #endif /* defined (BFD_HOST_U_64_BIT) */
2986 /* This is the fallback solution if no 64bit type is available or if we
2987 are not supposed to spend much time on optimizations. We select the
2988 bucket count using a fixed set of numbers. */
2989 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2991 best_size
= elf_buckets
[i
];
2992 if (dynsymcount
< elf_buckets
[i
+ 1])
2997 /* Free the arrays we needed. */
3003 /* Set up the sizes and contents of the ELF dynamic sections. This is
3004 called by the ELF linker emulation before_allocation routine. We
3005 must set the sizes of the sections before the linker sets the
3006 addresses of the various sections. */
3009 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
3011 auxiliary_filters
, info
, sinterpptr
,
3016 const char *filter_shlib
;
3017 const char * const *auxiliary_filters
;
3018 struct bfd_link_info
*info
;
3019 asection
**sinterpptr
;
3020 struct bfd_elf_version_tree
*verdefs
;
3022 bfd_size_type soname_indx
;
3024 struct elf_backend_data
*bed
;
3025 struct elf_assign_sym_version_info asvinfo
;
3029 soname_indx
= (bfd_size_type
) -1;
3031 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
3034 if (! is_elf_hash_table (info
))
3037 /* Any syms created from now on start with -1 in
3038 got.refcount/offset and plt.refcount/offset. */
3039 elf_hash_table (info
)->init_refcount
= elf_hash_table (info
)->init_offset
;
3041 /* The backend may have to create some sections regardless of whether
3042 we're dynamic or not. */
3043 bed
= get_elf_backend_data (output_bfd
);
3044 if (bed
->elf_backend_always_size_sections
3045 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
3048 dynobj
= elf_hash_table (info
)->dynobj
;
3050 /* If there were no dynamic objects in the link, there is nothing to
3055 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
3058 if (elf_hash_table (info
)->dynamic_sections_created
)
3060 struct elf_info_failed eif
;
3061 struct elf_link_hash_entry
*h
;
3063 struct bfd_elf_version_tree
*t
;
3064 struct bfd_elf_version_expr
*d
;
3065 bfd_boolean all_defined
;
3067 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
3068 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
3072 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3074 if (soname_indx
== (bfd_size_type
) -1
3075 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SONAME
,
3082 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMBOLIC
,
3085 info
->flags
|= DF_SYMBOLIC
;
3092 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
3094 if (info
->new_dtags
)
3095 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
3096 if (indx
== (bfd_size_type
) -1
3097 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RPATH
, indx
)
3099 && ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RUNPATH
,
3104 if (filter_shlib
!= NULL
)
3108 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3109 filter_shlib
, TRUE
);
3110 if (indx
== (bfd_size_type
) -1
3111 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FILTER
, indx
))
3115 if (auxiliary_filters
!= NULL
)
3117 const char * const *p
;
3119 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
3123 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3125 if (indx
== (bfd_size_type
) -1
3126 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_AUXILIARY
,
3133 eif
.verdefs
= verdefs
;
3136 /* If we are supposed to export all symbols into the dynamic symbol
3137 table (this is not the normal case), then do so. */
3138 if (info
->export_dynamic
)
3140 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
3146 /* Make all global versions with definiton. */
3147 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3148 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3149 if (!d
->symver
&& strchr (d
->pattern
, '*') == NULL
)
3151 const char *verstr
, *name
;
3152 size_t namelen
, verlen
, newlen
;
3154 struct elf_link_hash_entry
*newh
;
3157 namelen
= strlen (name
);
3159 verlen
= strlen (verstr
);
3160 newlen
= namelen
+ verlen
+ 3;
3162 newname
= (char *) bfd_malloc ((bfd_size_type
) newlen
);
3163 if (newname
== NULL
)
3165 memcpy (newname
, name
, namelen
);
3167 /* Check the hidden versioned definition. */
3168 p
= newname
+ namelen
;
3170 memcpy (p
, verstr
, verlen
+ 1);
3171 newh
= elf_link_hash_lookup (elf_hash_table (info
),
3172 newname
, FALSE
, FALSE
,
3175 || (newh
->root
.type
!= bfd_link_hash_defined
3176 && newh
->root
.type
!= bfd_link_hash_defweak
))
3178 /* Check the default versioned definition. */
3180 memcpy (p
, verstr
, verlen
+ 1);
3181 newh
= elf_link_hash_lookup (elf_hash_table (info
),
3182 newname
, FALSE
, FALSE
,
3187 /* Mark this version if there is a definition and it is
3188 not defined in a shared object. */
3190 && ((newh
->elf_link_hash_flags
3191 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)
3192 && (newh
->root
.type
== bfd_link_hash_defined
3193 || newh
->root
.type
== bfd_link_hash_defweak
))
3197 /* Attach all the symbols to their version information. */
3198 asvinfo
.output_bfd
= output_bfd
;
3199 asvinfo
.info
= info
;
3200 asvinfo
.verdefs
= verdefs
;
3201 asvinfo
.failed
= FALSE
;
3203 elf_link_hash_traverse (elf_hash_table (info
),
3204 elf_link_assign_sym_version
,
3209 if (!info
->allow_undefined_version
)
3211 /* Check if all global versions have a definiton. */
3213 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3214 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3215 if (!d
->symver
&& !d
->script
3216 && strchr (d
->pattern
, '*') == NULL
)
3218 (*_bfd_error_handler
)
3219 (_("%s: undefined version: %s"),
3220 d
->pattern
, t
->name
);
3221 all_defined
= FALSE
;
3226 bfd_set_error (bfd_error_bad_value
);
3231 /* Find all symbols which were defined in a dynamic object and make
3232 the backend pick a reasonable value for them. */
3233 elf_link_hash_traverse (elf_hash_table (info
),
3234 elf_adjust_dynamic_symbol
,
3239 /* Add some entries to the .dynamic section. We fill in some of the
3240 values later, in elf_bfd_final_link, but we must add the entries
3241 now so that we know the final size of the .dynamic section. */
3243 /* If there are initialization and/or finalization functions to
3244 call then add the corresponding DT_INIT/DT_FINI entries. */
3245 h
= (info
->init_function
3246 ? elf_link_hash_lookup (elf_hash_table (info
),
3247 info
->init_function
, FALSE
,
3251 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3252 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3254 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT
, (bfd_vma
) 0))
3257 h
= (info
->fini_function
3258 ? elf_link_hash_lookup (elf_hash_table (info
),
3259 info
->fini_function
, FALSE
,
3263 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3264 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3266 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI
, (bfd_vma
) 0))
3270 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
3272 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3278 for (sub
= info
->input_bfds
; sub
!= NULL
;
3279 sub
= sub
->link_next
)
3280 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
3281 if (elf_section_data (o
)->this_hdr
.sh_type
3282 == SHT_PREINIT_ARRAY
)
3284 (*_bfd_error_handler
)
3285 (_("%s: .preinit_array section is not allowed in DSO"),
3286 bfd_archive_filename (sub
));
3290 bfd_set_error (bfd_error_nonrepresentable_section
);
3294 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAY
,
3296 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAYSZ
,
3300 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
3302 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAY
,
3304 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAYSZ
,
3308 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
3310 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAY
,
3312 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAYSZ
,
3317 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3318 /* If .dynstr is excluded from the link, we don't want any of
3319 these tags. Strictly, we should be checking each section
3320 individually; This quick check covers for the case where
3321 someone does a /DISCARD/ : { *(*) }. */
3322 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3324 bfd_size_type strsize
;
3326 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3327 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3328 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3329 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3330 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3331 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3332 (bfd_vma
) sizeof (Elf_External_Sym
)))
3337 /* The backend must work out the sizes of all the other dynamic
3339 if (bed
->elf_backend_size_dynamic_sections
3340 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3343 if (elf_hash_table (info
)->dynamic_sections_created
)
3345 bfd_size_type dynsymcount
;
3347 size_t bucketcount
= 0;
3348 size_t hash_entry_size
;
3349 unsigned int dtagcount
;
3351 /* Set up the version definition section. */
3352 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3353 BFD_ASSERT (s
!= NULL
);
3355 /* We may have created additional version definitions if we are
3356 just linking a regular application. */
3357 verdefs
= asvinfo
.verdefs
;
3359 /* Skip anonymous version tag. */
3360 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3361 verdefs
= verdefs
->next
;
3363 if (verdefs
== NULL
)
3364 _bfd_strip_section_from_output (info
, s
);
3369 struct bfd_elf_version_tree
*t
;
3371 Elf_Internal_Verdef def
;
3372 Elf_Internal_Verdaux defaux
;
3377 /* Make space for the base version. */
3378 size
+= sizeof (Elf_External_Verdef
);
3379 size
+= sizeof (Elf_External_Verdaux
);
3382 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3384 struct bfd_elf_version_deps
*n
;
3386 size
+= sizeof (Elf_External_Verdef
);
3387 size
+= sizeof (Elf_External_Verdaux
);
3390 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3391 size
+= sizeof (Elf_External_Verdaux
);
3394 s
->_raw_size
= size
;
3395 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3396 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3399 /* Fill in the version definition section. */
3403 def
.vd_version
= VER_DEF_CURRENT
;
3404 def
.vd_flags
= VER_FLG_BASE
;
3407 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3408 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3409 + sizeof (Elf_External_Verdaux
));
3411 if (soname_indx
!= (bfd_size_type
) -1)
3413 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3415 def
.vd_hash
= bfd_elf_hash (soname
);
3416 defaux
.vda_name
= soname_indx
;
3423 name
= basename (output_bfd
->filename
);
3424 def
.vd_hash
= bfd_elf_hash (name
);
3425 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3427 if (indx
== (bfd_size_type
) -1)
3429 defaux
.vda_name
= indx
;
3431 defaux
.vda_next
= 0;
3433 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3434 (Elf_External_Verdef
*) p
);
3435 p
+= sizeof (Elf_External_Verdef
);
3436 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3437 (Elf_External_Verdaux
*) p
);
3438 p
+= sizeof (Elf_External_Verdaux
);
3440 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3443 struct bfd_elf_version_deps
*n
;
3444 struct elf_link_hash_entry
*h
;
3445 struct bfd_link_hash_entry
*bh
;
3448 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3451 /* Add a symbol representing this version. */
3453 if (! (_bfd_generic_link_add_one_symbol
3454 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3455 (bfd_vma
) 0, (const char *) NULL
, FALSE
,
3456 get_elf_backend_data (dynobj
)->collect
, &bh
)))
3458 h
= (struct elf_link_hash_entry
*) bh
;
3459 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3460 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3461 h
->type
= STT_OBJECT
;
3462 h
->verinfo
.vertree
= t
;
3464 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3467 def
.vd_version
= VER_DEF_CURRENT
;
3469 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3470 def
.vd_flags
|= VER_FLG_WEAK
;
3471 def
.vd_ndx
= t
->vernum
+ 1;
3472 def
.vd_cnt
= cdeps
+ 1;
3473 def
.vd_hash
= bfd_elf_hash (t
->name
);
3474 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3475 if (t
->next
!= NULL
)
3476 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3477 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3481 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3482 (Elf_External_Verdef
*) p
);
3483 p
+= sizeof (Elf_External_Verdef
);
3485 defaux
.vda_name
= h
->dynstr_index
;
3486 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3488 if (t
->deps
== NULL
)
3489 defaux
.vda_next
= 0;
3491 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3492 t
->name_indx
= defaux
.vda_name
;
3494 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3495 (Elf_External_Verdaux
*) p
);
3496 p
+= sizeof (Elf_External_Verdaux
);
3498 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3500 if (n
->version_needed
== NULL
)
3502 /* This can happen if there was an error in the
3504 defaux
.vda_name
= 0;
3508 defaux
.vda_name
= n
->version_needed
->name_indx
;
3509 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3512 if (n
->next
== NULL
)
3513 defaux
.vda_next
= 0;
3515 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3517 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3518 (Elf_External_Verdaux
*) p
);
3519 p
+= sizeof (Elf_External_Verdaux
);
3523 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3524 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3528 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3531 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
3533 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3540 info
->flags_1
&= ~ (DF_1_INITFIRST
3543 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3548 /* Work out the size of the version reference section. */
3550 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3551 BFD_ASSERT (s
!= NULL
);
3553 struct elf_find_verdep_info sinfo
;
3555 sinfo
.output_bfd
= output_bfd
;
3557 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3558 if (sinfo
.vers
== 0)
3560 sinfo
.failed
= FALSE
;
3562 elf_link_hash_traverse (elf_hash_table (info
),
3563 elf_link_find_version_dependencies
,
3566 if (elf_tdata (output_bfd
)->verref
== NULL
)
3567 _bfd_strip_section_from_output (info
, s
);
3570 Elf_Internal_Verneed
*t
;
3575 /* Build the version definition section. */
3578 for (t
= elf_tdata (output_bfd
)->verref
;
3582 Elf_Internal_Vernaux
*a
;
3584 size
+= sizeof (Elf_External_Verneed
);
3586 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3587 size
+= sizeof (Elf_External_Vernaux
);
3590 s
->_raw_size
= size
;
3591 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3592 if (s
->contents
== NULL
)
3596 for (t
= elf_tdata (output_bfd
)->verref
;
3601 Elf_Internal_Vernaux
*a
;
3605 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3608 t
->vn_version
= VER_NEED_CURRENT
;
3610 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3611 elf_dt_name (t
->vn_bfd
) != NULL
3612 ? elf_dt_name (t
->vn_bfd
)
3613 : basename (t
->vn_bfd
->filename
),
3615 if (indx
== (bfd_size_type
) -1)
3618 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3619 if (t
->vn_nextref
== NULL
)
3622 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3623 + caux
* sizeof (Elf_External_Vernaux
));
3625 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3626 (Elf_External_Verneed
*) p
);
3627 p
+= sizeof (Elf_External_Verneed
);
3629 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3631 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3632 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3633 a
->vna_nodename
, FALSE
);
3634 if (indx
== (bfd_size_type
) -1)
3637 if (a
->vna_nextptr
== NULL
)
3640 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3642 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3643 (Elf_External_Vernaux
*) p
);
3644 p
+= sizeof (Elf_External_Vernaux
);
3648 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3650 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3654 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3658 /* Assign dynsym indicies. In a shared library we generate a
3659 section symbol for each output section, which come first.
3660 Next come all of the back-end allocated local dynamic syms,
3661 followed by the rest of the global symbols. */
3663 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3665 /* Work out the size of the symbol version section. */
3666 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3667 BFD_ASSERT (s
!= NULL
);
3668 if (dynsymcount
== 0
3669 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3671 _bfd_strip_section_from_output (info
, s
);
3672 /* The DYNSYMCOUNT might have changed if we were going to
3673 output a dynamic symbol table entry for S. */
3674 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3678 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3679 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3680 if (s
->contents
== NULL
)
3683 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3687 /* Set the size of the .dynsym and .hash sections. We counted
3688 the number of dynamic symbols in elf_link_add_object_symbols.
3689 We will build the contents of .dynsym and .hash when we build
3690 the final symbol table, because until then we do not know the
3691 correct value to give the symbols. We built the .dynstr
3692 section as we went along in elf_link_add_object_symbols. */
3693 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3694 BFD_ASSERT (s
!= NULL
);
3695 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3696 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3697 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3700 if (dynsymcount
!= 0)
3702 Elf_Internal_Sym isym
;
3704 /* The first entry in .dynsym is a dummy symbol. */
3711 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3714 /* Compute the size of the hashing table. As a side effect this
3715 computes the hash values for all the names we export. */
3716 bucketcount
= compute_bucket_count (info
);
3718 s
= bfd_get_section_by_name (dynobj
, ".hash");
3719 BFD_ASSERT (s
!= NULL
);
3720 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3721 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3722 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3723 if (s
->contents
== NULL
)
3726 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3728 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3729 s
->contents
+ hash_entry_size
);
3731 elf_hash_table (info
)->bucketcount
= bucketcount
;
3733 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3734 BFD_ASSERT (s
!= NULL
);
3736 elf_finalize_dynstr (output_bfd
, info
);
3738 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3740 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3741 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3748 /* This function is used to adjust offsets into .dynstr for
3749 dynamic symbols. This is called via elf_link_hash_traverse. */
3751 static bfd_boolean elf_adjust_dynstr_offsets
3752 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3755 elf_adjust_dynstr_offsets (h
, data
)
3756 struct elf_link_hash_entry
*h
;
3759 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3761 if (h
->root
.type
== bfd_link_hash_warning
)
3762 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3764 if (h
->dynindx
!= -1)
3765 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3769 /* Assign string offsets in .dynstr, update all structures referencing
3773 elf_finalize_dynstr (output_bfd
, info
)
3775 struct bfd_link_info
*info
;
3777 struct elf_link_local_dynamic_entry
*entry
;
3778 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3779 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3782 Elf_External_Dyn
*dyncon
, *dynconend
;
3784 _bfd_elf_strtab_finalize (dynstr
);
3785 size
= _bfd_elf_strtab_size (dynstr
);
3787 /* Update all .dynamic entries referencing .dynstr strings. */
3788 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3789 BFD_ASSERT (sdyn
!= NULL
);
3791 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3792 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3794 for (; dyncon
< dynconend
; dyncon
++)
3796 Elf_Internal_Dyn dyn
;
3798 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3802 dyn
.d_un
.d_val
= size
;
3803 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3811 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3812 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3819 /* Now update local dynamic symbols. */
3820 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3821 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3822 entry
->isym
.st_name
);
3824 /* And the rest of dynamic symbols. */
3825 elf_link_hash_traverse (elf_hash_table (info
),
3826 elf_adjust_dynstr_offsets
, dynstr
);
3828 /* Adjust version definitions. */
3829 if (elf_tdata (output_bfd
)->cverdefs
)
3834 Elf_Internal_Verdef def
;
3835 Elf_Internal_Verdaux defaux
;
3837 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3838 p
= (bfd_byte
*) s
->contents
;
3841 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3843 p
+= sizeof (Elf_External_Verdef
);
3844 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3846 _bfd_elf_swap_verdaux_in (output_bfd
,
3847 (Elf_External_Verdaux
*) p
, &defaux
);
3848 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3850 _bfd_elf_swap_verdaux_out (output_bfd
,
3851 &defaux
, (Elf_External_Verdaux
*) p
);
3852 p
+= sizeof (Elf_External_Verdaux
);
3855 while (def
.vd_next
);
3858 /* Adjust version references. */
3859 if (elf_tdata (output_bfd
)->verref
)
3864 Elf_Internal_Verneed need
;
3865 Elf_Internal_Vernaux needaux
;
3867 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3868 p
= (bfd_byte
*) s
->contents
;
3871 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3873 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3874 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3875 (Elf_External_Verneed
*) p
);
3876 p
+= sizeof (Elf_External_Verneed
);
3877 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3879 _bfd_elf_swap_vernaux_in (output_bfd
,
3880 (Elf_External_Vernaux
*) p
, &needaux
);
3881 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3883 _bfd_elf_swap_vernaux_out (output_bfd
,
3885 (Elf_External_Vernaux
*) p
);
3886 p
+= sizeof (Elf_External_Vernaux
);
3889 while (need
.vn_next
);
3895 /* Fix up the flags for a symbol. This handles various cases which
3896 can only be fixed after all the input files are seen. This is
3897 currently called by both adjust_dynamic_symbol and
3898 assign_sym_version, which is unnecessary but perhaps more robust in
3899 the face of future changes. */
3902 elf_fix_symbol_flags (h
, eif
)
3903 struct elf_link_hash_entry
*h
;
3904 struct elf_info_failed
*eif
;
3906 /* If this symbol was mentioned in a non-ELF file, try to set
3907 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3908 permit a non-ELF file to correctly refer to a symbol defined in
3909 an ELF dynamic object. */
3910 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3912 while (h
->root
.type
== bfd_link_hash_indirect
)
3913 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3915 if (h
->root
.type
!= bfd_link_hash_defined
3916 && h
->root
.type
!= bfd_link_hash_defweak
)
3917 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3918 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3921 if (h
->root
.u
.def
.section
->owner
!= NULL
3922 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3923 == bfd_target_elf_flavour
))
3924 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3925 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3927 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3930 if (h
->dynindx
== -1
3931 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3932 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3934 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3943 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3944 was first seen in a non-ELF file. Fortunately, if the symbol
3945 was first seen in an ELF file, we're probably OK unless the
3946 symbol was defined in a non-ELF file. Catch that case here.
3947 FIXME: We're still in trouble if the symbol was first seen in
3948 a dynamic object, and then later in a non-ELF regular object. */
3949 if ((h
->root
.type
== bfd_link_hash_defined
3950 || h
->root
.type
== bfd_link_hash_defweak
)
3951 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3952 && (h
->root
.u
.def
.section
->owner
!= NULL
3953 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3954 != bfd_target_elf_flavour
)
3955 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3956 && (h
->elf_link_hash_flags
3957 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3958 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3961 /* If this is a final link, and the symbol was defined as a common
3962 symbol in a regular object file, and there was no definition in
3963 any dynamic object, then the linker will have allocated space for
3964 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3965 flag will not have been set. */
3966 if (h
->root
.type
== bfd_link_hash_defined
3967 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3968 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3969 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3970 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3971 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3973 /* If -Bsymbolic was used (which means to bind references to global
3974 symbols to the definition within the shared object), and this
3975 symbol was defined in a regular object, then it actually doesn't
3976 need a PLT entry, and we can accomplish that by forcing it local.
3977 Likewise, if the symbol has hidden or internal visibility.
3978 FIXME: It might be that we also do not need a PLT for other
3979 non-hidden visibilities, but we would have to tell that to the
3980 backend specifically; we can't just clear PLT-related data here. */
3981 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3982 && eif
->info
->shared
3983 && is_elf_hash_table (eif
->info
)
3984 && (eif
->info
->symbolic
3985 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3986 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3987 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3989 struct elf_backend_data
*bed
;
3990 bfd_boolean force_local
;
3992 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3994 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3995 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3996 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3999 /* If this is a weak defined symbol in a dynamic object, and we know
4000 the real definition in the dynamic object, copy interesting flags
4001 over to the real definition. */
4002 if (h
->weakdef
!= NULL
)
4004 struct elf_link_hash_entry
*weakdef
;
4006 weakdef
= h
->weakdef
;
4007 if (h
->root
.type
== bfd_link_hash_indirect
)
4008 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4010 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
4011 || h
->root
.type
== bfd_link_hash_defweak
);
4012 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
4013 || weakdef
->root
.type
== bfd_link_hash_defweak
);
4014 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
4016 /* If the real definition is defined by a regular object file,
4017 don't do anything special. See the longer description in
4018 elf_adjust_dynamic_symbol, below. */
4019 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
4023 struct elf_backend_data
*bed
;
4025 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
4026 (*bed
->elf_backend_copy_indirect_symbol
) (bed
, weakdef
, h
);
4033 /* Make the backend pick a good value for a dynamic symbol. This is
4034 called via elf_link_hash_traverse, and also calls itself
4038 elf_adjust_dynamic_symbol (h
, data
)
4039 struct elf_link_hash_entry
*h
;
4042 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4044 struct elf_backend_data
*bed
;
4046 if (! is_elf_hash_table (eif
->info
))
4049 if (h
->root
.type
== bfd_link_hash_warning
)
4051 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
4052 h
->got
= elf_hash_table (eif
->info
)->init_offset
;
4054 /* When warning symbols are created, they **replace** the "real"
4055 entry in the hash table, thus we never get to see the real
4056 symbol in a hash traversal. So look at it now. */
4057 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4060 /* Ignore indirect symbols. These are added by the versioning code. */
4061 if (h
->root
.type
== bfd_link_hash_indirect
)
4064 /* Fix the symbol flags. */
4065 if (! elf_fix_symbol_flags (h
, eif
))
4068 /* If this symbol does not require a PLT entry, and it is not
4069 defined by a dynamic object, or is not referenced by a regular
4070 object, ignore it. We do have to handle a weak defined symbol,
4071 even if no regular object refers to it, if we decided to add it
4072 to the dynamic symbol table. FIXME: Do we normally need to worry
4073 about symbols which are defined by one dynamic object and
4074 referenced by another one? */
4075 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
4076 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4077 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4078 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
4079 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
4081 h
->plt
= elf_hash_table (eif
->info
)->init_offset
;
4085 /* If we've already adjusted this symbol, don't do it again. This
4086 can happen via a recursive call. */
4087 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
4090 /* Don't look at this symbol again. Note that we must set this
4091 after checking the above conditions, because we may look at a
4092 symbol once, decide not to do anything, and then get called
4093 recursively later after REF_REGULAR is set below. */
4094 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
4096 /* If this is a weak definition, and we know a real definition, and
4097 the real symbol is not itself defined by a regular object file,
4098 then get a good value for the real definition. We handle the
4099 real symbol first, for the convenience of the backend routine.
4101 Note that there is a confusing case here. If the real definition
4102 is defined by a regular object file, we don't get the real symbol
4103 from the dynamic object, but we do get the weak symbol. If the
4104 processor backend uses a COPY reloc, then if some routine in the
4105 dynamic object changes the real symbol, we will not see that
4106 change in the corresponding weak symbol. This is the way other
4107 ELF linkers work as well, and seems to be a result of the shared
4110 I will clarify this issue. Most SVR4 shared libraries define the
4111 variable _timezone and define timezone as a weak synonym. The
4112 tzset call changes _timezone. If you write
4113 extern int timezone;
4115 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4116 you might expect that, since timezone is a synonym for _timezone,
4117 the same number will print both times. However, if the processor
4118 backend uses a COPY reloc, then actually timezone will be copied
4119 into your process image, and, since you define _timezone
4120 yourself, _timezone will not. Thus timezone and _timezone will
4121 wind up at different memory locations. The tzset call will set
4122 _timezone, leaving timezone unchanged. */
4124 if (h
->weakdef
!= NULL
)
4126 /* If we get to this point, we know there is an implicit
4127 reference by a regular object file via the weak symbol H.
4128 FIXME: Is this really true? What if the traversal finds
4129 H->WEAKDEF before it finds H? */
4130 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4132 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4136 /* If a symbol has no type and no size and does not require a PLT
4137 entry, then we are probably about to do the wrong thing here: we
4138 are probably going to create a COPY reloc for an empty object.
4139 This case can arise when a shared object is built with assembly
4140 code, and the assembly code fails to set the symbol type. */
4142 && h
->type
== STT_NOTYPE
4143 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4144 (*_bfd_error_handler
)
4145 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4146 h
->root
.root
.string
);
4148 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4149 bed
= get_elf_backend_data (dynobj
);
4150 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4159 /* This routine is used to export all defined symbols into the dynamic
4160 symbol table. It is called via elf_link_hash_traverse. */
4163 elf_export_symbol (h
, data
)
4164 struct elf_link_hash_entry
*h
;
4167 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4169 /* Ignore indirect symbols. These are added by the versioning code. */
4170 if (h
->root
.type
== bfd_link_hash_indirect
)
4173 if (h
->root
.type
== bfd_link_hash_warning
)
4174 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4176 if (h
->dynindx
== -1
4177 && (h
->elf_link_hash_flags
4178 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4180 struct bfd_elf_version_tree
*t
;
4181 struct bfd_elf_version_expr
*d
;
4183 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4185 if (t
->globals
!= NULL
)
4187 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4189 if ((*d
->match
) (d
, h
->root
.root
.string
))
4194 if (t
->locals
!= NULL
)
4196 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4198 if ((*d
->match
) (d
, h
->root
.root
.string
))
4207 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4218 /* Look through the symbols which are defined in other shared
4219 libraries and referenced here. Update the list of version
4220 dependencies. This will be put into the .gnu.version_r section.
4221 This function is called via elf_link_hash_traverse. */
4224 elf_link_find_version_dependencies (h
, data
)
4225 struct elf_link_hash_entry
*h
;
4228 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4229 Elf_Internal_Verneed
*t
;
4230 Elf_Internal_Vernaux
*a
;
4233 if (h
->root
.type
== bfd_link_hash_warning
)
4234 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4236 /* We only care about symbols defined in shared objects with version
4238 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4239 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4241 || h
->verinfo
.verdef
== NULL
)
4244 /* See if we already know about this version. */
4245 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4247 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4250 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4251 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4257 /* This is a new version. Add it to tree we are building. */
4262 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4265 rinfo
->failed
= TRUE
;
4269 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4270 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4271 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4275 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4277 /* Note that we are copying a string pointer here, and testing it
4278 above. If bfd_elf_string_from_elf_section is ever changed to
4279 discard the string data when low in memory, this will have to be
4281 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4283 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4284 a
->vna_nextptr
= t
->vn_auxptr
;
4286 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4289 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4296 /* Figure out appropriate versions for all the symbols. We may not
4297 have the version number script until we have read all of the input
4298 files, so until that point we don't know which symbols should be
4299 local. This function is called via elf_link_hash_traverse. */
4302 elf_link_assign_sym_version (h
, data
)
4303 struct elf_link_hash_entry
*h
;
4306 struct elf_assign_sym_version_info
*sinfo
;
4307 struct bfd_link_info
*info
;
4308 struct elf_backend_data
*bed
;
4309 struct elf_info_failed eif
;
4313 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4316 if (h
->root
.type
== bfd_link_hash_warning
)
4317 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4319 /* Fix the symbol flags. */
4322 if (! elf_fix_symbol_flags (h
, &eif
))
4325 sinfo
->failed
= TRUE
;
4329 /* We only need version numbers for symbols defined in regular
4331 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4334 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4335 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4336 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4338 struct bfd_elf_version_tree
*t
;
4343 /* There are two consecutive ELF_VER_CHR characters if this is
4344 not a hidden symbol. */
4346 if (*p
== ELF_VER_CHR
)
4352 /* If there is no version string, we can just return out. */
4356 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4360 /* Look for the version. If we find it, it is no longer weak. */
4361 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4363 if (strcmp (t
->name
, p
) == 0)
4367 struct bfd_elf_version_expr
*d
;
4369 len
= p
- h
->root
.root
.string
;
4370 alc
= bfd_malloc ((bfd_size_type
) len
);
4373 memcpy (alc
, h
->root
.root
.string
, len
- 1);
4374 alc
[len
- 1] = '\0';
4375 if (alc
[len
- 2] == ELF_VER_CHR
)
4376 alc
[len
- 2] = '\0';
4378 h
->verinfo
.vertree
= t
;
4382 if (t
->globals
!= NULL
)
4384 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4385 if ((*d
->match
) (d
, alc
))
4389 /* See if there is anything to force this symbol to
4391 if (d
== NULL
&& t
->locals
!= NULL
)
4393 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4395 if ((*d
->match
) (d
, alc
))
4397 if (h
->dynindx
!= -1
4399 && ! info
->export_dynamic
)
4401 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4414 /* If we are building an application, we need to create a
4415 version node for this version. */
4416 if (t
== NULL
&& ! info
->shared
)
4418 struct bfd_elf_version_tree
**pp
;
4421 /* If we aren't going to export this symbol, we don't need
4422 to worry about it. */
4423 if (h
->dynindx
== -1)
4427 t
= ((struct bfd_elf_version_tree
*)
4428 bfd_alloc (sinfo
->output_bfd
, amt
));
4431 sinfo
->failed
= TRUE
;
4440 t
->name_indx
= (unsigned int) -1;
4444 /* Don't count anonymous version tag. */
4445 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4447 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4449 t
->vernum
= version_index
;
4453 h
->verinfo
.vertree
= t
;
4457 /* We could not find the version for a symbol when
4458 generating a shared archive. Return an error. */
4459 (*_bfd_error_handler
)
4460 (_("%s: undefined versioned symbol name %s"),
4461 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4462 bfd_set_error (bfd_error_bad_value
);
4463 sinfo
->failed
= TRUE
;
4468 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4471 /* If we don't have a version for this symbol, see if we can find
4473 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4475 struct bfd_elf_version_tree
*t
;
4476 struct bfd_elf_version_tree
*local_ver
;
4477 struct bfd_elf_version_expr
*d
;
4479 /* See if can find what version this symbol is in. If the
4480 symbol is supposed to be local, then don't actually register
4483 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4485 if (t
->globals
!= NULL
)
4487 bfd_boolean matched
;
4490 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4492 if ((*d
->match
) (d
, h
->root
.root
.string
))
4498 /* There is a version without definition. Make
4499 the symbol the default definition for this
4501 h
->verinfo
.vertree
= t
;
4512 /* There is no undefined version for this symbol. Hide the
4514 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4517 if (t
->locals
!= NULL
)
4519 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4521 /* If the match is "*", keep looking for a more
4522 explicit, perhaps even global, match. */
4523 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4525 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4537 if (local_ver
!= NULL
)
4539 h
->verinfo
.vertree
= local_ver
;
4540 if (h
->dynindx
!= -1
4542 && ! info
->export_dynamic
)
4544 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4552 /* Final phase of ELF linker. */
4554 /* A structure we use to avoid passing large numbers of arguments. */
4556 struct elf_final_link_info
4558 /* General link information. */
4559 struct bfd_link_info
*info
;
4562 /* Symbol string table. */
4563 struct bfd_strtab_hash
*symstrtab
;
4564 /* .dynsym section. */
4565 asection
*dynsym_sec
;
4566 /* .hash section. */
4568 /* symbol version section (.gnu.version). */
4569 asection
*symver_sec
;
4570 /* first SHF_TLS section (if any). */
4571 asection
*first_tls_sec
;
4572 /* Buffer large enough to hold contents of any section. */
4574 /* Buffer large enough to hold external relocs of any section. */
4575 PTR external_relocs
;
4576 /* Buffer large enough to hold internal relocs of any section. */
4577 Elf_Internal_Rela
*internal_relocs
;
4578 /* Buffer large enough to hold external local symbols of any input
4580 Elf_External_Sym
*external_syms
;
4581 /* And a buffer for symbol section indices. */
4582 Elf_External_Sym_Shndx
*locsym_shndx
;
4583 /* Buffer large enough to hold internal local symbols of any input
4585 Elf_Internal_Sym
*internal_syms
;
4586 /* Array large enough to hold a symbol index for each local symbol
4587 of any input BFD. */
4589 /* Array large enough to hold a section pointer for each local
4590 symbol of any input BFD. */
4591 asection
**sections
;
4592 /* Buffer to hold swapped out symbols. */
4593 Elf_External_Sym
*symbuf
;
4594 /* And one for symbol section indices. */
4595 Elf_External_Sym_Shndx
*symshndxbuf
;
4596 /* Number of swapped out symbols in buffer. */
4597 size_t symbuf_count
;
4598 /* Number of symbols which fit in symbuf. */
4600 /* And same for symshndxbuf. */
4601 size_t shndxbuf_size
;
4604 static bfd_boolean elf_link_output_sym
4605 PARAMS ((struct elf_final_link_info
*, const char *,
4606 Elf_Internal_Sym
*, asection
*));
4607 static bfd_boolean elf_link_flush_output_syms
4608 PARAMS ((struct elf_final_link_info
*));
4609 static bfd_boolean elf_link_output_extsym
4610 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4611 static bfd_boolean elf_link_sec_merge_syms
4612 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4613 static bfd_boolean elf_link_check_versioned_symbol
4614 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
4615 static bfd_boolean elf_link_input_bfd
4616 PARAMS ((struct elf_final_link_info
*, bfd
*));
4617 static bfd_boolean elf_reloc_link_order
4618 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4619 struct bfd_link_order
*));
4621 /* This struct is used to pass information to elf_link_output_extsym. */
4623 struct elf_outext_info
4626 bfd_boolean localsyms
;
4627 struct elf_final_link_info
*finfo
;
4630 /* Compute the size of, and allocate space for, REL_HDR which is the
4631 section header for a section containing relocations for O. */
4634 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4636 Elf_Internal_Shdr
*rel_hdr
;
4639 bfd_size_type reloc_count
;
4640 bfd_size_type num_rel_hashes
;
4642 /* Figure out how many relocations there will be. */
4643 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4644 reloc_count
= elf_section_data (o
)->rel_count
;
4646 reloc_count
= elf_section_data (o
)->rel_count2
;
4648 num_rel_hashes
= o
->reloc_count
;
4649 if (num_rel_hashes
< reloc_count
)
4650 num_rel_hashes
= reloc_count
;
4652 /* That allows us to calculate the size of the section. */
4653 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4655 /* The contents field must last into write_object_contents, so we
4656 allocate it with bfd_alloc rather than malloc. Also since we
4657 cannot be sure that the contents will actually be filled in,
4658 we zero the allocated space. */
4659 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4660 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4663 /* We only allocate one set of hash entries, so we only do it the
4664 first time we are called. */
4665 if (elf_section_data (o
)->rel_hashes
== NULL
4668 struct elf_link_hash_entry
**p
;
4670 p
= ((struct elf_link_hash_entry
**)
4671 bfd_zmalloc (num_rel_hashes
4672 * sizeof (struct elf_link_hash_entry
*)));
4676 elf_section_data (o
)->rel_hashes
= p
;
4682 /* When performing a relocateable link, the input relocations are
4683 preserved. But, if they reference global symbols, the indices
4684 referenced must be updated. Update all the relocations in
4685 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4688 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4690 Elf_Internal_Shdr
*rel_hdr
;
4692 struct elf_link_hash_entry
**rel_hash
;
4695 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4697 void (*swap_in
) PARAMS ((bfd
*, const bfd_byte
*, Elf_Internal_Rela
*));
4698 void (*swap_out
) PARAMS ((bfd
*, const Elf_Internal_Rela
*, bfd_byte
*));
4700 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4702 swap_in
= bed
->s
->swap_reloc_in
;
4703 swap_out
= bed
->s
->swap_reloc_out
;
4705 else if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
))
4707 swap_in
= bed
->s
->swap_reloca_in
;
4708 swap_out
= bed
->s
->swap_reloca_out
;
4713 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
4716 erela
= rel_hdr
->contents
;
4717 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
4719 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
4722 if (*rel_hash
== NULL
)
4725 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4727 (*swap_in
) (abfd
, erela
, irela
);
4728 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4729 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4730 ELF_R_TYPE (irela
[j
].r_info
));
4731 (*swap_out
) (abfd
, irela
, erela
);
4735 struct elf_link_sort_rela
4738 enum elf_reloc_type_class type
;
4739 /* We use this as an array of size int_rels_per_ext_rel. */
4740 Elf_Internal_Rela rela
[1];
4744 elf_link_sort_cmp1 (A
, B
)
4748 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4749 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4750 int relativea
, relativeb
;
4752 relativea
= a
->type
== reloc_class_relative
;
4753 relativeb
= b
->type
== reloc_class_relative
;
4755 if (relativea
< relativeb
)
4757 if (relativea
> relativeb
)
4759 if (ELF_R_SYM (a
->rela
->r_info
) < ELF_R_SYM (b
->rela
->r_info
))
4761 if (ELF_R_SYM (a
->rela
->r_info
) > ELF_R_SYM (b
->rela
->r_info
))
4763 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
4765 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
4771 elf_link_sort_cmp2 (A
, B
)
4775 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4776 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4779 if (a
->offset
< b
->offset
)
4781 if (a
->offset
> b
->offset
)
4783 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4784 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4789 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
4791 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
4797 elf_link_sort_relocs (abfd
, info
, psec
)
4799 struct bfd_link_info
*info
;
4802 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4803 asection
*reldyn
, *o
;
4804 bfd_size_type count
, size
;
4805 size_t i
, ret
, sort_elt
, ext_size
;
4806 bfd_byte
*sort
, *s_non_relative
, *p
;
4807 struct elf_link_sort_rela
*sq
;
4808 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4809 int i2e
= bed
->s
->int_rels_per_ext_rel
;
4810 void (*swap_in
) PARAMS ((bfd
*, const bfd_byte
*, Elf_Internal_Rela
*));
4811 void (*swap_out
) PARAMS ((bfd
*, const Elf_Internal_Rela
*, bfd_byte
*));
4813 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4814 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4816 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4817 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4819 ext_size
= sizeof (Elf_External_Rel
);
4820 swap_in
= bed
->s
->swap_reloc_in
;
4821 swap_out
= bed
->s
->swap_reloc_out
;
4825 ext_size
= sizeof (Elf_External_Rela
);
4826 swap_in
= bed
->s
->swap_reloca_in
;
4827 swap_out
= bed
->s
->swap_reloca_out
;
4829 count
= reldyn
->_raw_size
/ ext_size
;
4832 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4833 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4834 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4835 && o
->output_section
== reldyn
)
4836 size
+= o
->_raw_size
;
4838 if (size
!= reldyn
->_raw_size
)
4841 sort_elt
= (sizeof (struct elf_link_sort_rela
)
4842 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
4843 sort
= bfd_zmalloc (sort_elt
* count
);
4846 (*info
->callbacks
->warning
)
4847 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4852 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4853 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4854 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4855 && o
->output_section
== reldyn
)
4857 bfd_byte
*erel
, *erelend
;
4860 erelend
= o
->contents
+ o
->_raw_size
;
4861 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
4862 while (erel
< erelend
)
4864 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
4865 (*swap_in
) (abfd
, erel
, s
->rela
);
4866 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
4872 qsort (sort
, (size_t) count
, sort_elt
, elf_link_sort_cmp1
);
4874 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
4876 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
4877 if (s
->type
!= reloc_class_relative
)
4883 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
4884 for (; i
< count
; i
++, p
+= sort_elt
)
4886 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
4887 if (ELF_R_SYM (sp
->rela
->r_info
) != ELF_R_SYM (sq
->rela
->r_info
))
4889 sp
->offset
= sq
->rela
->r_offset
;
4892 qsort (s_non_relative
, (size_t) count
- ret
, sort_elt
, elf_link_sort_cmp2
);
4894 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4895 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4896 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4897 && o
->output_section
== reldyn
)
4899 bfd_byte
*erel
, *erelend
;
4902 erelend
= o
->contents
+ o
->_raw_size
;
4903 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
4904 while (erel
< erelend
)
4906 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
4907 (*swap_out
) (abfd
, s
->rela
, erel
);
4918 /* Do the final step of an ELF link. */
4921 elf_bfd_final_link (abfd
, info
)
4923 struct bfd_link_info
*info
;
4925 bfd_boolean dynamic
;
4926 bfd_boolean emit_relocs
;
4928 struct elf_final_link_info finfo
;
4929 register asection
*o
;
4930 register struct bfd_link_order
*p
;
4932 bfd_size_type max_contents_size
;
4933 bfd_size_type max_external_reloc_size
;
4934 bfd_size_type max_internal_reloc_count
;
4935 bfd_size_type max_sym_count
;
4936 bfd_size_type max_sym_shndx_count
;
4938 Elf_Internal_Sym elfsym
;
4940 Elf_Internal_Shdr
*symtab_hdr
;
4941 Elf_Internal_Shdr
*symtab_shndx_hdr
;
4942 Elf_Internal_Shdr
*symstrtab_hdr
;
4943 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4944 struct elf_outext_info eoinfo
;
4946 size_t relativecount
= 0;
4947 asection
*reldyn
= 0;
4950 if (! is_elf_hash_table (info
))
4954 abfd
->flags
|= DYNAMIC
;
4956 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4957 dynobj
= elf_hash_table (info
)->dynobj
;
4959 emit_relocs
= (info
->relocateable
4960 || info
->emitrelocations
4961 || bed
->elf_backend_emit_relocs
);
4964 finfo
.output_bfd
= abfd
;
4965 finfo
.symstrtab
= elf_stringtab_init ();
4966 if (finfo
.symstrtab
== NULL
)
4971 finfo
.dynsym_sec
= NULL
;
4972 finfo
.hash_sec
= NULL
;
4973 finfo
.symver_sec
= NULL
;
4977 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4978 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4979 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4980 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4981 /* Note that it is OK if symver_sec is NULL. */
4984 finfo
.contents
= NULL
;
4985 finfo
.external_relocs
= NULL
;
4986 finfo
.internal_relocs
= NULL
;
4987 finfo
.external_syms
= NULL
;
4988 finfo
.locsym_shndx
= NULL
;
4989 finfo
.internal_syms
= NULL
;
4990 finfo
.indices
= NULL
;
4991 finfo
.sections
= NULL
;
4992 finfo
.symbuf
= NULL
;
4993 finfo
.symshndxbuf
= NULL
;
4994 finfo
.symbuf_count
= 0;
4995 finfo
.shndxbuf_size
= 0;
4996 finfo
.first_tls_sec
= NULL
;
4997 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4998 if ((o
->flags
& SEC_THREAD_LOCAL
) != 0
4999 && (o
->flags
& SEC_LOAD
) != 0)
5001 finfo
.first_tls_sec
= o
;
5005 /* Count up the number of relocations we will output for each output
5006 section, so that we know the sizes of the reloc sections. We
5007 also figure out some maximum sizes. */
5008 max_contents_size
= 0;
5009 max_external_reloc_size
= 0;
5010 max_internal_reloc_count
= 0;
5012 max_sym_shndx_count
= 0;
5014 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
5016 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
5019 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5021 unsigned int reloc_count
= 0;
5022 struct bfd_elf_section_data
*esdi
= NULL
;
5023 unsigned int *rel_count1
;
5025 if (p
->type
== bfd_section_reloc_link_order
5026 || p
->type
== bfd_symbol_reloc_link_order
)
5028 else if (p
->type
== bfd_indirect_link_order
)
5032 sec
= p
->u
.indirect
.section
;
5033 esdi
= elf_section_data (sec
);
5035 /* Mark all sections which are to be included in the
5036 link. This will normally be every section. We need
5037 to do this so that we can identify any sections which
5038 the linker has decided to not include. */
5039 sec
->linker_mark
= TRUE
;
5041 if (sec
->flags
& SEC_MERGE
)
5044 if (info
->relocateable
|| info
->emitrelocations
)
5045 reloc_count
= sec
->reloc_count
;
5046 else if (bed
->elf_backend_count_relocs
)
5048 Elf_Internal_Rela
* relocs
;
5050 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5051 (abfd
, sec
, (PTR
) NULL
,
5052 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
5054 reloc_count
= (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
5056 if (elf_section_data (o
)->relocs
!= relocs
)
5060 if (sec
->_raw_size
> max_contents_size
)
5061 max_contents_size
= sec
->_raw_size
;
5062 if (sec
->_cooked_size
> max_contents_size
)
5063 max_contents_size
= sec
->_cooked_size
;
5065 /* We are interested in just local symbols, not all
5067 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
5068 && (sec
->owner
->flags
& DYNAMIC
) == 0)
5072 if (elf_bad_symtab (sec
->owner
))
5073 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
5074 / sizeof (Elf_External_Sym
));
5076 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
5078 if (sym_count
> max_sym_count
)
5079 max_sym_count
= sym_count
;
5081 if (sym_count
> max_sym_shndx_count
5082 && elf_symtab_shndx (sec
->owner
) != 0)
5083 max_sym_shndx_count
= sym_count
;
5085 if ((sec
->flags
& SEC_RELOC
) != 0)
5089 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
5090 if (ext_size
> max_external_reloc_size
)
5091 max_external_reloc_size
= ext_size
;
5092 if (sec
->reloc_count
> max_internal_reloc_count
)
5093 max_internal_reloc_count
= sec
->reloc_count
;
5098 if (reloc_count
== 0)
5101 o
->reloc_count
+= reloc_count
;
5103 /* MIPS may have a mix of REL and RELA relocs on sections.
5104 To support this curious ABI we keep reloc counts in
5105 elf_section_data too. We must be careful to add the
5106 relocations from the input section to the right output
5107 count. FIXME: Get rid of one count. We have
5108 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
5109 rel_count1
= &esdo
->rel_count
;
5112 bfd_boolean same_size
;
5113 bfd_size_type entsize1
;
5115 entsize1
= esdi
->rel_hdr
.sh_entsize
;
5116 BFD_ASSERT (entsize1
== sizeof (Elf_External_Rel
)
5117 || entsize1
== sizeof (Elf_External_Rela
));
5118 same_size
= (!o
->use_rela_p
5119 == (entsize1
== sizeof (Elf_External_Rel
)));
5122 rel_count1
= &esdo
->rel_count2
;
5124 if (esdi
->rel_hdr2
!= NULL
)
5126 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
5127 unsigned int alt_count
;
5128 unsigned int *rel_count2
;
5130 BFD_ASSERT (entsize2
!= entsize1
5131 && (entsize2
== sizeof (Elf_External_Rel
)
5132 || entsize2
== sizeof (Elf_External_Rela
)));
5134 rel_count2
= &esdo
->rel_count2
;
5136 rel_count2
= &esdo
->rel_count
;
5138 /* The following is probably too simplistic if the
5139 backend counts output relocs unusually. */
5140 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
5141 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5142 *rel_count2
+= alt_count
;
5143 reloc_count
-= alt_count
;
5146 *rel_count1
+= reloc_count
;
5149 if (o
->reloc_count
> 0)
5150 o
->flags
|= SEC_RELOC
;
5153 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5154 set it (this is probably a bug) and if it is set
5155 assign_section_numbers will create a reloc section. */
5156 o
->flags
&=~ SEC_RELOC
;
5159 /* If the SEC_ALLOC flag is not set, force the section VMA to
5160 zero. This is done in elf_fake_sections as well, but forcing
5161 the VMA to 0 here will ensure that relocs against these
5162 sections are handled correctly. */
5163 if ((o
->flags
& SEC_ALLOC
) == 0
5164 && ! o
->user_set_vma
)
5168 if (! info
->relocateable
&& merged
)
5169 elf_link_hash_traverse (elf_hash_table (info
),
5170 elf_link_sec_merge_syms
, (PTR
) abfd
);
5172 /* Figure out the file positions for everything but the symbol table
5173 and the relocs. We set symcount to force assign_section_numbers
5174 to create a symbol table. */
5175 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5176 BFD_ASSERT (! abfd
->output_has_begun
);
5177 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5180 /* That created the reloc sections. Set their sizes, and assign
5181 them file positions, and allocate some buffers. */
5182 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5184 if ((o
->flags
& SEC_RELOC
) != 0)
5186 if (!elf_link_size_reloc_section (abfd
,
5187 &elf_section_data (o
)->rel_hdr
,
5191 if (elf_section_data (o
)->rel_hdr2
5192 && !elf_link_size_reloc_section (abfd
,
5193 elf_section_data (o
)->rel_hdr2
,
5198 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5199 to count upwards while actually outputting the relocations. */
5200 elf_section_data (o
)->rel_count
= 0;
5201 elf_section_data (o
)->rel_count2
= 0;
5204 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5206 /* We have now assigned file positions for all the sections except
5207 .symtab and .strtab. We start the .symtab section at the current
5208 file position, and write directly to it. We build the .strtab
5209 section in memory. */
5210 bfd_get_symcount (abfd
) = 0;
5211 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5212 /* sh_name is set in prep_headers. */
5213 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5214 /* sh_flags, sh_addr and sh_size all start off zero. */
5215 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5216 /* sh_link is set in assign_section_numbers. */
5217 /* sh_info is set below. */
5218 /* sh_offset is set just below. */
5219 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5221 off
= elf_tdata (abfd
)->next_file_pos
;
5222 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
5224 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5225 incorrect. We do not yet know the size of the .symtab section.
5226 We correct next_file_pos below, after we do know the size. */
5228 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5229 continuously seeking to the right position in the file. */
5230 if (! info
->keep_memory
|| max_sym_count
< 20)
5231 finfo
.symbuf_size
= 20;
5233 finfo
.symbuf_size
= max_sym_count
;
5234 amt
= finfo
.symbuf_size
;
5235 amt
*= sizeof (Elf_External_Sym
);
5236 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5237 if (finfo
.symbuf
== NULL
)
5239 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5241 /* Wild guess at number of output symbols. realloc'd as needed. */
5242 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
5243 finfo
.shndxbuf_size
= amt
;
5244 amt
*= sizeof (Elf_External_Sym_Shndx
);
5245 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
5246 if (finfo
.symshndxbuf
== NULL
)
5250 /* Start writing out the symbol table. The first symbol is always a
5252 if (info
->strip
!= strip_all
5255 elfsym
.st_value
= 0;
5258 elfsym
.st_other
= 0;
5259 elfsym
.st_shndx
= SHN_UNDEF
;
5260 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5261 &elfsym
, bfd_und_section_ptr
))
5266 /* Some standard ELF linkers do this, but we don't because it causes
5267 bootstrap comparison failures. */
5268 /* Output a file symbol for the output file as the second symbol.
5269 We output this even if we are discarding local symbols, although
5270 I'm not sure if this is correct. */
5271 elfsym
.st_value
= 0;
5273 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5274 elfsym
.st_other
= 0;
5275 elfsym
.st_shndx
= SHN_ABS
;
5276 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5277 &elfsym
, bfd_abs_section_ptr
))
5281 /* Output a symbol for each section. We output these even if we are
5282 discarding local symbols, since they are used for relocs. These
5283 symbols have no names. We store the index of each one in the
5284 index field of the section, so that we can find it again when
5285 outputting relocs. */
5286 if (info
->strip
!= strip_all
5290 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5291 elfsym
.st_other
= 0;
5292 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5294 o
= section_from_elf_index (abfd
, i
);
5296 o
->target_index
= bfd_get_symcount (abfd
);
5297 elfsym
.st_shndx
= i
;
5298 if (info
->relocateable
|| o
== NULL
)
5299 elfsym
.st_value
= 0;
5301 elfsym
.st_value
= o
->vma
;
5302 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5305 if (i
== SHN_LORESERVE
- 1)
5306 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5310 /* Allocate some memory to hold information read in from the input
5312 if (max_contents_size
!= 0)
5314 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5315 if (finfo
.contents
== NULL
)
5319 if (max_external_reloc_size
!= 0)
5321 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5322 if (finfo
.external_relocs
== NULL
)
5326 if (max_internal_reloc_count
!= 0)
5328 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5329 amt
*= sizeof (Elf_Internal_Rela
);
5330 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5331 if (finfo
.internal_relocs
== NULL
)
5335 if (max_sym_count
!= 0)
5337 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5338 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5339 if (finfo
.external_syms
== NULL
)
5342 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5343 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5344 if (finfo
.internal_syms
== NULL
)
5347 amt
= max_sym_count
* sizeof (long);
5348 finfo
.indices
= (long *) bfd_malloc (amt
);
5349 if (finfo
.indices
== NULL
)
5352 amt
= max_sym_count
* sizeof (asection
*);
5353 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5354 if (finfo
.sections
== NULL
)
5358 if (max_sym_shndx_count
!= 0)
5360 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5361 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5362 if (finfo
.locsym_shndx
== NULL
)
5366 if (finfo
.first_tls_sec
)
5368 unsigned int align
= 0;
5369 bfd_vma base
= finfo
.first_tls_sec
->vma
, end
= 0;
5372 for (sec
= finfo
.first_tls_sec
;
5373 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
5376 bfd_vma size
= sec
->_raw_size
;
5378 if (bfd_get_section_alignment (abfd
, sec
) > align
)
5379 align
= bfd_get_section_alignment (abfd
, sec
);
5380 if (sec
->_raw_size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
5382 struct bfd_link_order
*o
;
5385 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
5386 if (size
< o
->offset
+ o
->size
)
5387 size
= o
->offset
+ o
->size
;
5389 end
= sec
->vma
+ size
;
5391 elf_hash_table (info
)->tls_segment
5392 = bfd_zalloc (abfd
, sizeof (struct elf_link_tls_segment
));
5393 if (elf_hash_table (info
)->tls_segment
== NULL
)
5395 elf_hash_table (info
)->tls_segment
->start
= base
;
5396 elf_hash_table (info
)->tls_segment
->size
= end
- base
;
5397 elf_hash_table (info
)->tls_segment
->align
= align
;
5400 /* Since ELF permits relocations to be against local symbols, we
5401 must have the local symbols available when we do the relocations.
5402 Since we would rather only read the local symbols once, and we
5403 would rather not keep them in memory, we handle all the
5404 relocations for a single input file at the same time.
5406 Unfortunately, there is no way to know the total number of local
5407 symbols until we have seen all of them, and the local symbol
5408 indices precede the global symbol indices. This means that when
5409 we are generating relocateable output, and we see a reloc against
5410 a global symbol, we can not know the symbol index until we have
5411 finished examining all the local symbols to see which ones we are
5412 going to output. To deal with this, we keep the relocations in
5413 memory, and don't output them until the end of the link. This is
5414 an unfortunate waste of memory, but I don't see a good way around
5415 it. Fortunately, it only happens when performing a relocateable
5416 link, which is not the common case. FIXME: If keep_memory is set
5417 we could write the relocs out and then read them again; I don't
5418 know how bad the memory loss will be. */
5420 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5421 sub
->output_has_begun
= FALSE
;
5422 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5424 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5426 if (p
->type
== bfd_indirect_link_order
5427 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
5428 == bfd_target_elf_flavour
)
5429 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
5431 if (! sub
->output_has_begun
)
5433 if (! elf_link_input_bfd (&finfo
, sub
))
5435 sub
->output_has_begun
= TRUE
;
5438 else if (p
->type
== bfd_section_reloc_link_order
5439 || p
->type
== bfd_symbol_reloc_link_order
)
5441 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5446 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5452 /* Output any global symbols that got converted to local in a
5453 version script or due to symbol visibility. We do this in a
5454 separate step since ELF requires all local symbols to appear
5455 prior to any global symbols. FIXME: We should only do this if
5456 some global symbols were, in fact, converted to become local.
5457 FIXME: Will this work correctly with the Irix 5 linker? */
5458 eoinfo
.failed
= FALSE
;
5459 eoinfo
.finfo
= &finfo
;
5460 eoinfo
.localsyms
= TRUE
;
5461 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5466 /* That wrote out all the local symbols. Finish up the symbol table
5467 with the global symbols. Even if we want to strip everything we
5468 can, we still need to deal with those global symbols that got
5469 converted to local in a version script. */
5471 /* The sh_info field records the index of the first non local symbol. */
5472 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5475 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5477 Elf_Internal_Sym sym
;
5478 Elf_External_Sym
*dynsym
=
5479 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5480 long last_local
= 0;
5482 /* Write out the section symbols for the output sections. */
5489 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5492 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5495 Elf_External_Sym
*dest
;
5497 indx
= elf_section_data (s
)->this_idx
;
5498 BFD_ASSERT (indx
> 0);
5499 sym
.st_shndx
= indx
;
5500 sym
.st_value
= s
->vma
;
5501 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5502 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5505 last_local
= bfd_count_sections (abfd
);
5508 /* Write out the local dynsyms. */
5509 if (elf_hash_table (info
)->dynlocal
)
5511 struct elf_link_local_dynamic_entry
*e
;
5512 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5515 Elf_External_Sym
*dest
;
5517 sym
.st_size
= e
->isym
.st_size
;
5518 sym
.st_other
= e
->isym
.st_other
;
5520 /* Copy the internal symbol as is.
5521 Note that we saved a word of storage and overwrote
5522 the original st_name with the dynstr_index. */
5525 if (e
->isym
.st_shndx
!= SHN_UNDEF
5526 && (e
->isym
.st_shndx
< SHN_LORESERVE
5527 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5529 s
= bfd_section_from_elf_index (e
->input_bfd
,
5533 elf_section_data (s
->output_section
)->this_idx
;
5534 sym
.st_value
= (s
->output_section
->vma
5536 + e
->isym
.st_value
);
5539 if (last_local
< e
->dynindx
)
5540 last_local
= e
->dynindx
;
5542 dest
= dynsym
+ e
->dynindx
;
5543 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5547 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5551 /* We get the global symbols from the hash table. */
5552 eoinfo
.failed
= FALSE
;
5553 eoinfo
.localsyms
= FALSE
;
5554 eoinfo
.finfo
= &finfo
;
5555 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5560 /* If backend needs to output some symbols not present in the hash
5561 table, do it now. */
5562 if (bed
->elf_backend_output_arch_syms
)
5564 typedef bfd_boolean (*out_sym_func
)
5565 PARAMS ((PTR
, const char *, Elf_Internal_Sym
*, asection
*));
5567 if (! ((*bed
->elf_backend_output_arch_syms
)
5568 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5572 /* Flush all symbols to the file. */
5573 if (! elf_link_flush_output_syms (&finfo
))
5576 /* Now we know the size of the symtab section. */
5577 off
+= symtab_hdr
->sh_size
;
5579 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
5580 if (symtab_shndx_hdr
->sh_name
!= 0)
5582 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
5583 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
5584 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
5585 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
5586 symtab_shndx_hdr
->sh_size
= amt
;
5588 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
5591 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
5592 || (bfd_bwrite ((PTR
) finfo
.symshndxbuf
, amt
, abfd
) != amt
))
5597 /* Finish up and write out the symbol string table (.strtab)
5599 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5600 /* sh_name was set in prep_headers. */
5601 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5602 symstrtab_hdr
->sh_flags
= 0;
5603 symstrtab_hdr
->sh_addr
= 0;
5604 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5605 symstrtab_hdr
->sh_entsize
= 0;
5606 symstrtab_hdr
->sh_link
= 0;
5607 symstrtab_hdr
->sh_info
= 0;
5608 /* sh_offset is set just below. */
5609 symstrtab_hdr
->sh_addralign
= 1;
5611 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
5612 elf_tdata (abfd
)->next_file_pos
= off
;
5614 if (bfd_get_symcount (abfd
) > 0)
5616 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5617 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5621 /* Adjust the relocs to have the correct symbol indices. */
5622 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5624 if ((o
->flags
& SEC_RELOC
) == 0)
5627 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5628 elf_section_data (o
)->rel_count
,
5629 elf_section_data (o
)->rel_hashes
);
5630 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5631 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5632 elf_section_data (o
)->rel_count2
,
5633 (elf_section_data (o
)->rel_hashes
5634 + elf_section_data (o
)->rel_count
));
5636 /* Set the reloc_count field to 0 to prevent write_relocs from
5637 trying to swap the relocs out itself. */
5641 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5642 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5644 /* If we are linking against a dynamic object, or generating a
5645 shared library, finish up the dynamic linking information. */
5648 Elf_External_Dyn
*dyncon
, *dynconend
;
5650 /* Fix up .dynamic entries. */
5651 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5652 BFD_ASSERT (o
!= NULL
);
5654 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5655 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5656 for (; dyncon
< dynconend
; dyncon
++)
5658 Elf_Internal_Dyn dyn
;
5662 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5669 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5671 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5673 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5674 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5677 if (dyn
.d_tag
!= DT_NULL
)
5679 dyn
.d_un
.d_val
= relativecount
;
5680 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5686 name
= info
->init_function
;
5689 name
= info
->fini_function
;
5692 struct elf_link_hash_entry
*h
;
5694 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5695 FALSE
, FALSE
, TRUE
);
5697 && (h
->root
.type
== bfd_link_hash_defined
5698 || h
->root
.type
== bfd_link_hash_defweak
))
5700 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5701 o
= h
->root
.u
.def
.section
;
5702 if (o
->output_section
!= NULL
)
5703 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5704 + o
->output_offset
);
5707 /* The symbol is imported from another shared
5708 library and does not apply to this one. */
5712 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5717 case DT_PREINIT_ARRAYSZ
:
5718 name
= ".preinit_array";
5720 case DT_INIT_ARRAYSZ
:
5721 name
= ".init_array";
5723 case DT_FINI_ARRAYSZ
:
5724 name
= ".fini_array";
5726 o
= bfd_get_section_by_name (abfd
, name
);
5729 (*_bfd_error_handler
)
5730 (_("%s: could not find output section %s"),
5731 bfd_get_filename (abfd
), name
);
5734 if (o
->_raw_size
== 0)
5735 (*_bfd_error_handler
)
5736 (_("warning: %s section has zero size"), name
);
5737 dyn
.d_un
.d_val
= o
->_raw_size
;
5738 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5741 case DT_PREINIT_ARRAY
:
5742 name
= ".preinit_array";
5745 name
= ".init_array";
5748 name
= ".fini_array";
5761 name
= ".gnu.version_d";
5764 name
= ".gnu.version_r";
5767 name
= ".gnu.version";
5769 o
= bfd_get_section_by_name (abfd
, name
);
5772 (*_bfd_error_handler
)
5773 (_("%s: could not find output section %s"),
5774 bfd_get_filename (abfd
), name
);
5777 dyn
.d_un
.d_ptr
= o
->vma
;
5778 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5785 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5790 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5792 Elf_Internal_Shdr
*hdr
;
5794 hdr
= elf_elfsections (abfd
)[i
];
5795 if (hdr
->sh_type
== type
5796 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5798 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5799 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5802 if (dyn
.d_un
.d_val
== 0
5803 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5804 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5808 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5814 /* If we have created any dynamic sections, then output them. */
5817 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5820 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5822 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5823 || o
->_raw_size
== 0
5824 || o
->output_section
== bfd_abs_section_ptr
)
5826 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5828 /* At this point, we are only interested in sections
5829 created by elf_link_create_dynamic_sections. */
5832 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5834 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5836 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5838 (file_ptr
) o
->output_offset
,
5844 /* The contents of the .dynstr section are actually in a
5846 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5847 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5848 || ! _bfd_elf_strtab_emit (abfd
,
5849 elf_hash_table (info
)->dynstr
))
5855 if (info
->relocateable
)
5857 bfd_boolean failed
= FALSE
;
5859 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
5864 /* If we have optimized stabs strings, output them. */
5865 if (elf_hash_table (info
)->stab_info
!= NULL
)
5867 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5871 if (info
->eh_frame_hdr
)
5873 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
5877 if (finfo
.symstrtab
!= NULL
)
5878 _bfd_stringtab_free (finfo
.symstrtab
);
5879 if (finfo
.contents
!= NULL
)
5880 free (finfo
.contents
);
5881 if (finfo
.external_relocs
!= NULL
)
5882 free (finfo
.external_relocs
);
5883 if (finfo
.internal_relocs
!= NULL
)
5884 free (finfo
.internal_relocs
);
5885 if (finfo
.external_syms
!= NULL
)
5886 free (finfo
.external_syms
);
5887 if (finfo
.locsym_shndx
!= NULL
)
5888 free (finfo
.locsym_shndx
);
5889 if (finfo
.internal_syms
!= NULL
)
5890 free (finfo
.internal_syms
);
5891 if (finfo
.indices
!= NULL
)
5892 free (finfo
.indices
);
5893 if (finfo
.sections
!= NULL
)
5894 free (finfo
.sections
);
5895 if (finfo
.symbuf
!= NULL
)
5896 free (finfo
.symbuf
);
5897 if (finfo
.symshndxbuf
!= NULL
)
5898 free (finfo
.symshndxbuf
);
5899 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5901 if ((o
->flags
& SEC_RELOC
) != 0
5902 && elf_section_data (o
)->rel_hashes
!= NULL
)
5903 free (elf_section_data (o
)->rel_hashes
);
5906 elf_tdata (abfd
)->linker
= TRUE
;
5911 if (finfo
.symstrtab
!= NULL
)
5912 _bfd_stringtab_free (finfo
.symstrtab
);
5913 if (finfo
.contents
!= NULL
)
5914 free (finfo
.contents
);
5915 if (finfo
.external_relocs
!= NULL
)
5916 free (finfo
.external_relocs
);
5917 if (finfo
.internal_relocs
!= NULL
)
5918 free (finfo
.internal_relocs
);
5919 if (finfo
.external_syms
!= NULL
)
5920 free (finfo
.external_syms
);
5921 if (finfo
.locsym_shndx
!= NULL
)
5922 free (finfo
.locsym_shndx
);
5923 if (finfo
.internal_syms
!= NULL
)
5924 free (finfo
.internal_syms
);
5925 if (finfo
.indices
!= NULL
)
5926 free (finfo
.indices
);
5927 if (finfo
.sections
!= NULL
)
5928 free (finfo
.sections
);
5929 if (finfo
.symbuf
!= NULL
)
5930 free (finfo
.symbuf
);
5931 if (finfo
.symshndxbuf
!= NULL
)
5932 free (finfo
.symshndxbuf
);
5933 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5935 if ((o
->flags
& SEC_RELOC
) != 0
5936 && elf_section_data (o
)->rel_hashes
!= NULL
)
5937 free (elf_section_data (o
)->rel_hashes
);
5943 /* Add a symbol to the output symbol table. */
5946 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5947 struct elf_final_link_info
*finfo
;
5949 Elf_Internal_Sym
*elfsym
;
5950 asection
*input_sec
;
5952 Elf_External_Sym
*dest
;
5953 Elf_External_Sym_Shndx
*destshndx
;
5954 bfd_boolean (*output_symbol_hook
)
5955 PARAMS ((bfd
*, struct bfd_link_info
*info
, const char *,
5956 Elf_Internal_Sym
*, asection
*));
5958 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5959 elf_backend_link_output_symbol_hook
;
5960 if (output_symbol_hook
!= NULL
)
5962 if (! ((*output_symbol_hook
)
5963 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5967 if (name
== (const char *) NULL
|| *name
== '\0')
5968 elfsym
->st_name
= 0;
5969 else if (input_sec
->flags
& SEC_EXCLUDE
)
5970 elfsym
->st_name
= 0;
5973 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5975 if (elfsym
->st_name
== (unsigned long) -1)
5979 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5981 if (! elf_link_flush_output_syms (finfo
))
5985 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5986 destshndx
= finfo
->symshndxbuf
;
5987 if (destshndx
!= NULL
)
5989 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
5993 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
5994 finfo
->symshndxbuf
= destshndx
= bfd_realloc (destshndx
, amt
* 2);
5995 if (destshndx
== NULL
)
5997 memset ((char *) destshndx
+ amt
, 0, amt
);
5998 finfo
->shndxbuf_size
*= 2;
6000 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
6003 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
6004 finfo
->symbuf_count
+= 1;
6005 bfd_get_symcount (finfo
->output_bfd
) += 1;
6010 /* Flush the output symbols to the file. */
6013 elf_link_flush_output_syms (finfo
)
6014 struct elf_final_link_info
*finfo
;
6016 if (finfo
->symbuf_count
> 0)
6018 Elf_Internal_Shdr
*hdr
;
6022 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
6023 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
6024 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
6025 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
6026 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
6029 hdr
->sh_size
+= amt
;
6030 finfo
->symbuf_count
= 0;
6036 /* Adjust all external symbols pointing into SEC_MERGE sections
6037 to reflect the object merging within the sections. */
6040 elf_link_sec_merge_syms (h
, data
)
6041 struct elf_link_hash_entry
*h
;
6046 if (h
->root
.type
== bfd_link_hash_warning
)
6047 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6049 if ((h
->root
.type
== bfd_link_hash_defined
6050 || h
->root
.type
== bfd_link_hash_defweak
)
6051 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
6052 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
6054 bfd
*output_bfd
= (bfd
*) data
;
6056 h
->root
.u
.def
.value
=
6057 _bfd_merged_section_offset (output_bfd
,
6058 &h
->root
.u
.def
.section
,
6059 elf_section_data (sec
)->sec_info
,
6060 h
->root
.u
.def
.value
, (bfd_vma
) 0);
6066 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
6067 allowing an unsatisfied unversioned symbol in the DSO to match a
6068 versioned symbol that would normally require an explicit version. */
6071 elf_link_check_versioned_symbol (info
, h
)
6072 struct bfd_link_info
*info
;
6073 struct elf_link_hash_entry
*h
;
6075 bfd
*undef_bfd
= h
->root
.u
.undef
.abfd
;
6076 struct elf_link_loaded_list
*loaded
;
6078 if ((undef_bfd
->flags
& DYNAMIC
) == 0
6079 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
6080 || elf_dt_soname (h
->root
.u
.undef
.abfd
) == NULL
)
6083 for (loaded
= elf_hash_table (info
)->loaded
;
6085 loaded
= loaded
->next
)
6088 Elf_Internal_Shdr
*hdr
;
6089 bfd_size_type symcount
;
6090 bfd_size_type extsymcount
;
6091 bfd_size_type extsymoff
;
6092 Elf_Internal_Shdr
*versymhdr
;
6093 Elf_Internal_Sym
*isym
;
6094 Elf_Internal_Sym
*isymend
;
6095 Elf_Internal_Sym
*isymbuf
;
6096 Elf_External_Versym
*ever
;
6097 Elf_External_Versym
*extversym
;
6099 input
= loaded
->abfd
;
6101 /* We check each DSO for a possible hidden versioned definition. */
6102 if (input
== undef_bfd
6103 || (input
->flags
& DYNAMIC
) == 0
6104 || elf_dynversym (input
) == 0)
6107 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
6109 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6110 if (elf_bad_symtab (input
))
6112 extsymcount
= symcount
;
6117 extsymcount
= symcount
- hdr
->sh_info
;
6118 extsymoff
= hdr
->sh_info
;
6121 if (extsymcount
== 0)
6124 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
6126 if (isymbuf
== NULL
)
6129 /* Read in any version definitions. */
6130 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
6131 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
6132 if (extversym
== NULL
)
6135 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
6136 || (bfd_bread ((PTR
) extversym
, versymhdr
->sh_size
, input
)
6137 != versymhdr
->sh_size
))
6145 ever
= extversym
+ extsymoff
;
6146 isymend
= isymbuf
+ extsymcount
;
6147 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
6150 Elf_Internal_Versym iver
;
6152 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
6153 || isym
->st_shndx
== SHN_UNDEF
)
6156 name
= bfd_elf_string_from_elf_section (input
,
6159 if (strcmp (name
, h
->root
.root
.string
) != 0)
6162 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
6164 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
6166 /* If we have a non-hidden versioned sym, then it should
6167 have provided a definition for the undefined sym. */
6171 if ((iver
.vs_vers
& VERSYM_VERSION
) == 2)
6173 /* This is the oldest (default) sym. We can use it. */
6187 /* Add an external symbol to the symbol table. This is called from
6188 the hash table traversal routine. When generating a shared object,
6189 we go through the symbol table twice. The first time we output
6190 anything that might have been forced to local scope in a version
6191 script. The second time we output the symbols that are still
6195 elf_link_output_extsym (h
, data
)
6196 struct elf_link_hash_entry
*h
;
6199 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
6200 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
6202 Elf_Internal_Sym sym
;
6203 asection
*input_sec
;
6205 if (h
->root
.type
== bfd_link_hash_warning
)
6207 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6208 if (h
->root
.type
== bfd_link_hash_new
)
6212 /* Decide whether to output this symbol in this pass. */
6213 if (eoinfo
->localsyms
)
6215 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6220 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6224 /* If we are not creating a shared library, and this symbol is
6225 referenced by a shared library but is not defined anywhere, then
6226 warn that it is undefined. If we do not do this, the runtime
6227 linker will complain that the symbol is undefined when the
6228 program is run. We don't have to worry about symbols that are
6229 referenced by regular files, because we will already have issued
6230 warnings for them. */
6231 if (! finfo
->info
->relocateable
6232 && (! finfo
->info
->shared
|| ! finfo
->info
->allow_shlib_undefined
)
6233 && h
->root
.type
== bfd_link_hash_undefined
6234 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
6235 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
6236 && ! elf_link_check_versioned_symbol (finfo
->info
, h
))
6238 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6239 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
6240 (asection
*) NULL
, (bfd_vma
) 0, TRUE
)))
6242 eoinfo
->failed
= TRUE
;
6247 /* We don't want to output symbols that have never been mentioned by
6248 a regular file, or that we have been told to strip. However, if
6249 h->indx is set to -2, the symbol is used by a reloc and we must
6253 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6254 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6255 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6256 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6258 else if (finfo
->info
->strip
== strip_all
)
6260 else if (finfo
->info
->strip
== strip_some
6261 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6262 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
6264 else if (finfo
->info
->strip_discarded
6265 && (h
->root
.type
== bfd_link_hash_defined
6266 || h
->root
.type
== bfd_link_hash_defweak
)
6267 && elf_discarded_section (h
->root
.u
.def
.section
))
6272 /* If we're stripping it, and it's not a dynamic symbol, there's
6273 nothing else to do unless it is a forced local symbol. */
6276 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6280 sym
.st_size
= h
->size
;
6281 sym
.st_other
= h
->other
;
6282 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6283 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6284 else if (h
->root
.type
== bfd_link_hash_undefweak
6285 || h
->root
.type
== bfd_link_hash_defweak
)
6286 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6288 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6290 switch (h
->root
.type
)
6293 case bfd_link_hash_new
:
6294 case bfd_link_hash_warning
:
6298 case bfd_link_hash_undefined
:
6299 case bfd_link_hash_undefweak
:
6300 input_sec
= bfd_und_section_ptr
;
6301 sym
.st_shndx
= SHN_UNDEF
;
6304 case bfd_link_hash_defined
:
6305 case bfd_link_hash_defweak
:
6307 input_sec
= h
->root
.u
.def
.section
;
6308 if (input_sec
->output_section
!= NULL
)
6311 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6312 input_sec
->output_section
);
6313 if (sym
.st_shndx
== SHN_BAD
)
6315 (*_bfd_error_handler
)
6316 (_("%s: could not find output section %s for input section %s"),
6317 bfd_get_filename (finfo
->output_bfd
),
6318 input_sec
->output_section
->name
,
6320 eoinfo
->failed
= TRUE
;
6324 /* ELF symbols in relocateable files are section relative,
6325 but in nonrelocateable files they are virtual
6327 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6328 if (! finfo
->info
->relocateable
)
6330 sym
.st_value
+= input_sec
->output_section
->vma
;
6331 if (h
->type
== STT_TLS
)
6333 /* STT_TLS symbols are relative to PT_TLS segment
6335 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6336 sym
.st_value
-= finfo
->first_tls_sec
->vma
;
6342 BFD_ASSERT (input_sec
->owner
== NULL
6343 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6344 sym
.st_shndx
= SHN_UNDEF
;
6345 input_sec
= bfd_und_section_ptr
;
6350 case bfd_link_hash_common
:
6351 input_sec
= h
->root
.u
.c
.p
->section
;
6352 sym
.st_shndx
= SHN_COMMON
;
6353 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6356 case bfd_link_hash_indirect
:
6357 /* These symbols are created by symbol versioning. They point
6358 to the decorated version of the name. For example, if the
6359 symbol foo@@GNU_1.2 is the default, which should be used when
6360 foo is used with no version, then we add an indirect symbol
6361 foo which points to foo@@GNU_1.2. We ignore these symbols,
6362 since the indirected symbol is already in the hash table. */
6366 /* Give the processor backend a chance to tweak the symbol value,
6367 and also to finish up anything that needs to be done for this
6368 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6369 forced local syms when non-shared is due to a historical quirk. */
6370 if ((h
->dynindx
!= -1
6371 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6372 && (finfo
->info
->shared
6373 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6374 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6376 struct elf_backend_data
*bed
;
6378 bed
= get_elf_backend_data (finfo
->output_bfd
);
6379 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6380 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6382 eoinfo
->failed
= TRUE
;
6387 /* If we are marking the symbol as undefined, and there are no
6388 non-weak references to this symbol from a regular object, then
6389 mark the symbol as weak undefined; if there are non-weak
6390 references, mark the symbol as strong. We can't do this earlier,
6391 because it might not be marked as undefined until the
6392 finish_dynamic_symbol routine gets through with it. */
6393 if (sym
.st_shndx
== SHN_UNDEF
6394 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6395 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6396 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6400 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6401 bindtype
= STB_GLOBAL
;
6403 bindtype
= STB_WEAK
;
6404 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6407 /* If a symbol is not defined locally, we clear the visibility field. */
6408 if (! finfo
->info
->relocateable
6409 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6410 sym
.st_other
&= ~ ELF_ST_VISIBILITY (-1);
6412 /* If this symbol should be put in the .dynsym section, then put it
6413 there now. We already know the symbol index. We also fill in
6414 the entry in the .hash section. */
6415 if (h
->dynindx
!= -1
6416 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6420 size_t hash_entry_size
;
6421 bfd_byte
*bucketpos
;
6423 Elf_External_Sym
*esym
;
6425 sym
.st_name
= h
->dynstr_index
;
6426 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6427 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6429 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6430 bucket
= h
->elf_hash_value
% bucketcount
;
6432 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6433 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6434 + (bucket
+ 2) * hash_entry_size
);
6435 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6436 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6438 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6439 ((bfd_byte
*) finfo
->hash_sec
->contents
6440 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6442 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6444 Elf_Internal_Versym iversym
;
6445 Elf_External_Versym
*eversym
;
6447 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6449 if (h
->verinfo
.verdef
== NULL
)
6450 iversym
.vs_vers
= 0;
6452 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6456 if (h
->verinfo
.vertree
== NULL
)
6457 iversym
.vs_vers
= 1;
6459 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6462 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6463 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6465 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6466 eversym
+= h
->dynindx
;
6467 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6471 /* If we're stripping it, then it was just a dynamic symbol, and
6472 there's nothing else to do. */
6473 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6476 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6478 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6480 eoinfo
->failed
= TRUE
;
6487 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6488 originated from the section given by INPUT_REL_HDR) to the
6492 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6495 asection
*input_section
;
6496 Elf_Internal_Shdr
*input_rel_hdr
;
6497 Elf_Internal_Rela
*internal_relocs
;
6499 Elf_Internal_Rela
*irela
;
6500 Elf_Internal_Rela
*irelaend
;
6502 Elf_Internal_Shdr
*output_rel_hdr
;
6503 asection
*output_section
;
6504 unsigned int *rel_countp
= NULL
;
6505 struct elf_backend_data
*bed
;
6506 void (*swap_out
) PARAMS ((bfd
*, const Elf_Internal_Rela
*, bfd_byte
*));
6508 output_section
= input_section
->output_section
;
6509 output_rel_hdr
= NULL
;
6511 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6512 == input_rel_hdr
->sh_entsize
)
6514 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6515 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6517 else if (elf_section_data (output_section
)->rel_hdr2
6518 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6519 == input_rel_hdr
->sh_entsize
))
6521 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6522 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6526 (*_bfd_error_handler
)
6527 (_("%s: relocation size mismatch in %s section %s"),
6528 bfd_get_filename (output_bfd
),
6529 bfd_archive_filename (input_section
->owner
),
6530 input_section
->name
);
6531 bfd_set_error (bfd_error_wrong_object_format
);
6535 bed
= get_elf_backend_data (output_bfd
);
6536 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6537 swap_out
= bed
->s
->swap_reloc_out
;
6538 else if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
))
6539 swap_out
= bed
->s
->swap_reloca_out
;
6543 erel
= output_rel_hdr
->contents
;
6544 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
6545 irela
= internal_relocs
;
6546 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
6547 * bed
->s
->int_rels_per_ext_rel
);
6548 while (irela
< irelaend
)
6550 (*swap_out
) (output_bfd
, irela
, erel
);
6551 irela
+= bed
->s
->int_rels_per_ext_rel
;
6552 erel
+= input_rel_hdr
->sh_entsize
;
6555 /* Bump the counter, so that we know where to add the next set of
6557 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6562 /* Link an input file into the linker output file. This function
6563 handles all the sections and relocations of the input file at once.
6564 This is so that we only have to read the local symbols once, and
6565 don't have to keep them in memory. */
6568 elf_link_input_bfd (finfo
, input_bfd
)
6569 struct elf_final_link_info
*finfo
;
6572 bfd_boolean (*relocate_section
)
6573 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
6574 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
6576 Elf_Internal_Shdr
*symtab_hdr
;
6579 Elf_Internal_Sym
*isymbuf
;
6580 Elf_Internal_Sym
*isym
;
6581 Elf_Internal_Sym
*isymend
;
6583 asection
**ppsection
;
6585 struct elf_backend_data
*bed
;
6586 bfd_boolean emit_relocs
;
6587 struct elf_link_hash_entry
**sym_hashes
;
6589 output_bfd
= finfo
->output_bfd
;
6590 bed
= get_elf_backend_data (output_bfd
);
6591 relocate_section
= bed
->elf_backend_relocate_section
;
6593 /* If this is a dynamic object, we don't want to do anything here:
6594 we don't want the local symbols, and we don't want the section
6596 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6599 emit_relocs
= (finfo
->info
->relocateable
6600 || finfo
->info
->emitrelocations
6601 || bed
->elf_backend_emit_relocs
);
6603 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6604 if (elf_bad_symtab (input_bfd
))
6606 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6611 locsymcount
= symtab_hdr
->sh_info
;
6612 extsymoff
= symtab_hdr
->sh_info
;
6615 /* Read the local symbols. */
6616 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6617 if (isymbuf
== NULL
&& locsymcount
!= 0)
6619 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6620 finfo
->internal_syms
,
6621 finfo
->external_syms
,
6622 finfo
->locsym_shndx
);
6623 if (isymbuf
== NULL
)
6627 /* Find local symbol sections and adjust values of symbols in
6628 SEC_MERGE sections. Write out those local symbols we know are
6629 going into the output file. */
6630 isymend
= isymbuf
+ locsymcount
;
6631 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6633 isym
++, pindex
++, ppsection
++)
6637 Elf_Internal_Sym osym
;
6641 if (elf_bad_symtab (input_bfd
))
6643 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6650 if (isym
->st_shndx
== SHN_UNDEF
)
6651 isec
= bfd_und_section_ptr
;
6652 else if (isym
->st_shndx
< SHN_LORESERVE
6653 || isym
->st_shndx
> SHN_HIRESERVE
)
6655 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6657 && isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
6658 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6660 _bfd_merged_section_offset (output_bfd
, &isec
,
6661 elf_section_data (isec
)->sec_info
,
6662 isym
->st_value
, (bfd_vma
) 0);
6664 else if (isym
->st_shndx
== SHN_ABS
)
6665 isec
= bfd_abs_section_ptr
;
6666 else if (isym
->st_shndx
== SHN_COMMON
)
6667 isec
= bfd_com_section_ptr
;
6676 /* Don't output the first, undefined, symbol. */
6677 if (ppsection
== finfo
->sections
)
6680 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6682 /* We never output section symbols. Instead, we use the
6683 section symbol of the corresponding section in the output
6688 /* If we are stripping all symbols, we don't want to output this
6690 if (finfo
->info
->strip
== strip_all
)
6693 /* If we are discarding all local symbols, we don't want to
6694 output this one. If we are generating a relocateable output
6695 file, then some of the local symbols may be required by
6696 relocs; we output them below as we discover that they are
6698 if (finfo
->info
->discard
== discard_all
)
6701 /* If this symbol is defined in a section which we are
6702 discarding, we don't need to keep it, but note that
6703 linker_mark is only reliable for sections that have contents.
6704 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6705 as well as linker_mark. */
6706 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6708 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6709 || (! finfo
->info
->relocateable
6710 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6713 /* Get the name of the symbol. */
6714 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6719 /* See if we are discarding symbols with this name. */
6720 if ((finfo
->info
->strip
== strip_some
6721 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
6723 || (((finfo
->info
->discard
== discard_sec_merge
6724 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6725 || finfo
->info
->discard
== discard_l
)
6726 && bfd_is_local_label_name (input_bfd
, name
)))
6729 /* If we get here, we are going to output this symbol. */
6733 /* Adjust the section index for the output file. */
6734 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6735 isec
->output_section
);
6736 if (osym
.st_shndx
== SHN_BAD
)
6739 *pindex
= bfd_get_symcount (output_bfd
);
6741 /* ELF symbols in relocateable files are section relative, but
6742 in executable files they are virtual addresses. Note that
6743 this code assumes that all ELF sections have an associated
6744 BFD section with a reasonable value for output_offset; below
6745 we assume that they also have a reasonable value for
6746 output_section. Any special sections must be set up to meet
6747 these requirements. */
6748 osym
.st_value
+= isec
->output_offset
;
6749 if (! finfo
->info
->relocateable
)
6751 osym
.st_value
+= isec
->output_section
->vma
;
6752 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6754 /* STT_TLS symbols are relative to PT_TLS segment base. */
6755 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6756 osym
.st_value
-= finfo
->first_tls_sec
->vma
;
6760 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6764 /* Relocate the contents of each section. */
6765 sym_hashes
= elf_sym_hashes (input_bfd
);
6766 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6770 if (! o
->linker_mark
)
6772 /* This section was omitted from the link. */
6776 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6777 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6780 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6782 /* Section was created by elf_link_create_dynamic_sections
6787 /* Get the contents of the section. They have been cached by a
6788 relaxation routine. Note that o is a section in an input
6789 file, so the contents field will not have been set by any of
6790 the routines which work on output files. */
6791 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6792 contents
= elf_section_data (o
)->this_hdr
.contents
;
6795 contents
= finfo
->contents
;
6796 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6797 (file_ptr
) 0, o
->_raw_size
))
6801 if ((o
->flags
& SEC_RELOC
) != 0)
6803 Elf_Internal_Rela
*internal_relocs
;
6805 /* Get the swapped relocs. */
6806 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6807 (input_bfd
, o
, finfo
->external_relocs
,
6808 finfo
->internal_relocs
, FALSE
));
6809 if (internal_relocs
== NULL
6810 && o
->reloc_count
> 0)
6813 /* Run through the relocs looking for any against symbols
6814 from discarded sections and section symbols from
6815 removed link-once sections. Complain about relocs
6816 against discarded sections. Zero relocs against removed
6817 link-once sections. */
6818 if (!finfo
->info
->relocateable
6819 && !elf_section_ignore_discarded_relocs (o
))
6821 Elf_Internal_Rela
*rel
, *relend
;
6823 rel
= internal_relocs
;
6824 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6825 for ( ; rel
< relend
; rel
++)
6827 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6829 if (r_symndx
>= locsymcount
6830 || (elf_bad_symtab (input_bfd
)
6831 && finfo
->sections
[r_symndx
] == NULL
))
6833 struct elf_link_hash_entry
*h
;
6835 h
= sym_hashes
[r_symndx
- extsymoff
];
6836 while (h
->root
.type
== bfd_link_hash_indirect
6837 || h
->root
.type
== bfd_link_hash_warning
)
6838 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6840 /* Complain if the definition comes from a
6841 discarded section. */
6842 if ((h
->root
.type
== bfd_link_hash_defined
6843 || h
->root
.type
== bfd_link_hash_defweak
)
6844 && elf_discarded_section (h
->root
.u
.def
.section
))
6846 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6848 BFD_ASSERT (r_symndx
!= 0);
6849 memset (rel
, 0, sizeof (*rel
));
6853 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6854 (finfo
->info
, h
->root
.root
.string
,
6855 input_bfd
, o
, rel
->r_offset
,
6863 asection
*sec
= finfo
->sections
[r_symndx
];
6865 if (sec
!= NULL
&& elf_discarded_section (sec
))
6867 if ((o
->flags
& SEC_DEBUGGING
) != 0
6868 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6870 BFD_ASSERT (r_symndx
!= 0);
6872 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6879 = _("local symbols in discarded section %s");
6881 = strlen (sec
->name
) + strlen (msg
) - 1;
6882 char *buf
= (char *) bfd_malloc (amt
);
6885 sprintf (buf
, msg
, sec
->name
);
6887 buf
= (char *) sec
->name
;
6888 ok
= (*finfo
->info
->callbacks
6889 ->undefined_symbol
) (finfo
->info
, buf
,
6893 if (buf
!= sec
->name
)
6903 /* Relocate the section by invoking a back end routine.
6905 The back end routine is responsible for adjusting the
6906 section contents as necessary, and (if using Rela relocs
6907 and generating a relocateable output file) adjusting the
6908 reloc addend as necessary.
6910 The back end routine does not have to worry about setting
6911 the reloc address or the reloc symbol index.
6913 The back end routine is given a pointer to the swapped in
6914 internal symbols, and can access the hash table entries
6915 for the external symbols via elf_sym_hashes (input_bfd).
6917 When generating relocateable output, the back end routine
6918 must handle STB_LOCAL/STT_SECTION symbols specially. The
6919 output symbol is going to be a section symbol
6920 corresponding to the output section, which will require
6921 the addend to be adjusted. */
6923 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6924 input_bfd
, o
, contents
,
6932 Elf_Internal_Rela
*irela
;
6933 Elf_Internal_Rela
*irelaend
;
6934 bfd_vma last_offset
;
6935 struct elf_link_hash_entry
**rel_hash
;
6936 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6937 unsigned int next_erel
;
6938 bfd_boolean (*reloc_emitter
)
6939 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*,
6940 Elf_Internal_Rela
*));
6941 bfd_boolean rela_normal
;
6943 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6944 rela_normal
= (bed
->rela_normal
6945 && (input_rel_hdr
->sh_entsize
6946 == sizeof (Elf_External_Rela
)));
6948 /* Adjust the reloc addresses and symbol indices. */
6950 irela
= internal_relocs
;
6951 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6952 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6953 + elf_section_data (o
->output_section
)->rel_count
6954 + elf_section_data (o
->output_section
)->rel_count2
);
6955 last_offset
= o
->output_offset
;
6956 if (!finfo
->info
->relocateable
)
6957 last_offset
+= o
->output_section
->vma
;
6958 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6960 unsigned long r_symndx
;
6962 Elf_Internal_Sym sym
;
6964 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6970 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
6973 if (irela
->r_offset
>= (bfd_vma
) -2)
6975 /* This is a reloc for a deleted entry or somesuch.
6976 Turn it into an R_*_NONE reloc, at the same
6977 offset as the last reloc. elf_eh_frame.c and
6978 elf_bfd_discard_info rely on reloc offsets
6980 irela
->r_offset
= last_offset
;
6982 irela
->r_addend
= 0;
6986 irela
->r_offset
+= o
->output_offset
;
6988 /* Relocs in an executable have to be virtual addresses. */
6989 if (!finfo
->info
->relocateable
)
6990 irela
->r_offset
+= o
->output_section
->vma
;
6992 last_offset
= irela
->r_offset
;
6994 r_symndx
= ELF_R_SYM (irela
->r_info
);
6995 if (r_symndx
== STN_UNDEF
)
6998 if (r_symndx
>= locsymcount
6999 || (elf_bad_symtab (input_bfd
)
7000 && finfo
->sections
[r_symndx
] == NULL
))
7002 struct elf_link_hash_entry
*rh
;
7005 /* This is a reloc against a global symbol. We
7006 have not yet output all the local symbols, so
7007 we do not know the symbol index of any global
7008 symbol. We set the rel_hash entry for this
7009 reloc to point to the global hash table entry
7010 for this symbol. The symbol index is then
7011 set at the end of elf_bfd_final_link. */
7012 indx
= r_symndx
- extsymoff
;
7013 rh
= elf_sym_hashes (input_bfd
)[indx
];
7014 while (rh
->root
.type
== bfd_link_hash_indirect
7015 || rh
->root
.type
== bfd_link_hash_warning
)
7016 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
7018 /* Setting the index to -2 tells
7019 elf_link_output_extsym that this symbol is
7021 BFD_ASSERT (rh
->indx
< 0);
7029 /* This is a reloc against a local symbol. */
7032 sym
= isymbuf
[r_symndx
];
7033 sec
= finfo
->sections
[r_symndx
];
7034 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
7036 /* I suppose the backend ought to fill in the
7037 section of any STT_SECTION symbol against a
7038 processor specific section. If we have
7039 discarded a section, the output_section will
7040 be the absolute section. */
7041 if (bfd_is_abs_section (sec
)
7043 && bfd_is_abs_section (sec
->output_section
)))
7045 else if (sec
== NULL
|| sec
->owner
== NULL
)
7047 bfd_set_error (bfd_error_bad_value
);
7052 r_symndx
= sec
->output_section
->target_index
;
7053 BFD_ASSERT (r_symndx
!= 0);
7056 /* Adjust the addend according to where the
7057 section winds up in the output section. */
7059 irela
->r_addend
+= sec
->output_offset
;
7063 if (finfo
->indices
[r_symndx
] == -1)
7065 unsigned long shlink
;
7069 if (finfo
->info
->strip
== strip_all
)
7071 /* You can't do ld -r -s. */
7072 bfd_set_error (bfd_error_invalid_operation
);
7076 /* This symbol was skipped earlier, but
7077 since it is needed by a reloc, we
7078 must output it now. */
7079 shlink
= symtab_hdr
->sh_link
;
7080 name
= (bfd_elf_string_from_elf_section
7081 (input_bfd
, shlink
, sym
.st_name
));
7085 osec
= sec
->output_section
;
7087 _bfd_elf_section_from_bfd_section (output_bfd
,
7089 if (sym
.st_shndx
== SHN_BAD
)
7092 sym
.st_value
+= sec
->output_offset
;
7093 if (! finfo
->info
->relocateable
)
7095 sym
.st_value
+= osec
->vma
;
7096 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
7098 /* STT_TLS symbols are relative to PT_TLS
7100 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
7101 sym
.st_value
-= finfo
->first_tls_sec
->vma
;
7105 finfo
->indices
[r_symndx
]
7106 = bfd_get_symcount (output_bfd
);
7108 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
))
7112 r_symndx
= finfo
->indices
[r_symndx
];
7115 irela
->r_info
= ELF_R_INFO (r_symndx
,
7116 ELF_R_TYPE (irela
->r_info
));
7119 /* Swap out the relocs. */
7120 if (bed
->elf_backend_emit_relocs
7121 && !(finfo
->info
->relocateable
7122 || finfo
->info
->emitrelocations
))
7123 reloc_emitter
= bed
->elf_backend_emit_relocs
;
7125 reloc_emitter
= elf_link_output_relocs
;
7127 if (input_rel_hdr
->sh_size
!= 0
7128 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7132 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
7133 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
7135 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
7136 * bed
->s
->int_rels_per_ext_rel
);
7137 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
7144 /* Write out the modified section contents. */
7145 if (bed
->elf_backend_write_section
7146 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
7148 /* Section written out. */
7150 else switch (o
->sec_info_type
)
7152 case ELF_INFO_TYPE_STABS
:
7153 if (! (_bfd_write_section_stabs
7155 &elf_hash_table (finfo
->info
)->stab_info
,
7156 o
, &elf_section_data (o
)->sec_info
, contents
)))
7159 case ELF_INFO_TYPE_MERGE
:
7160 if (! _bfd_write_merged_section (output_bfd
, o
,
7161 elf_section_data (o
)->sec_info
))
7164 case ELF_INFO_TYPE_EH_FRAME
:
7166 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
7173 bfd_size_type sec_size
;
7175 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
7176 if (! (o
->flags
& SEC_EXCLUDE
)
7177 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
7179 (file_ptr
) o
->output_offset
,
7190 /* Generate a reloc when linking an ELF file. This is a reloc
7191 requested by the linker, and does come from any input file. This
7192 is used to build constructor and destructor tables when linking
7196 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
7198 struct bfd_link_info
*info
;
7199 asection
*output_section
;
7200 struct bfd_link_order
*link_order
;
7202 reloc_howto_type
*howto
;
7206 struct elf_link_hash_entry
**rel_hash_ptr
;
7207 Elf_Internal_Shdr
*rel_hdr
;
7208 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7209 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
7213 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7216 bfd_set_error (bfd_error_bad_value
);
7220 addend
= link_order
->u
.reloc
.p
->addend
;
7222 /* Figure out the symbol index. */
7223 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7224 + elf_section_data (output_section
)->rel_count
7225 + elf_section_data (output_section
)->rel_count2
);
7226 if (link_order
->type
== bfd_section_reloc_link_order
)
7228 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7229 BFD_ASSERT (indx
!= 0);
7230 *rel_hash_ptr
= NULL
;
7234 struct elf_link_hash_entry
*h
;
7236 /* Treat a reloc against a defined symbol as though it were
7237 actually against the section. */
7238 h
= ((struct elf_link_hash_entry
*)
7239 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7240 link_order
->u
.reloc
.p
->u
.name
,
7241 FALSE
, FALSE
, TRUE
));
7243 && (h
->root
.type
== bfd_link_hash_defined
7244 || h
->root
.type
== bfd_link_hash_defweak
))
7248 section
= h
->root
.u
.def
.section
;
7249 indx
= section
->output_section
->target_index
;
7250 *rel_hash_ptr
= NULL
;
7251 /* It seems that we ought to add the symbol value to the
7252 addend here, but in practice it has already been added
7253 because it was passed to constructor_callback. */
7254 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7258 /* Setting the index to -2 tells elf_link_output_extsym that
7259 this symbol is used by a reloc. */
7266 if (! ((*info
->callbacks
->unattached_reloc
)
7267 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
7268 (asection
*) NULL
, (bfd_vma
) 0)))
7274 /* If this is an inplace reloc, we must write the addend into the
7276 if (howto
->partial_inplace
&& addend
!= 0)
7279 bfd_reloc_status_type rstat
;
7282 const char *sym_name
;
7284 size
= bfd_get_reloc_size (howto
);
7285 buf
= (bfd_byte
*) bfd_zmalloc (size
);
7286 if (buf
== (bfd_byte
*) NULL
)
7288 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
7295 case bfd_reloc_outofrange
:
7298 case bfd_reloc_overflow
:
7299 if (link_order
->type
== bfd_section_reloc_link_order
)
7300 sym_name
= bfd_section_name (output_bfd
,
7301 link_order
->u
.reloc
.p
->u
.section
);
7303 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7304 if (! ((*info
->callbacks
->reloc_overflow
)
7305 (info
, sym_name
, howto
->name
, addend
,
7306 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
7313 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
7314 (file_ptr
) link_order
->offset
, size
);
7320 /* The address of a reloc is relative to the section in a
7321 relocateable file, and is a virtual address in an executable
7323 offset
= link_order
->offset
;
7324 if (! info
->relocateable
)
7325 offset
+= output_section
->vma
;
7327 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7329 irel
[i
].r_offset
= offset
;
7331 irel
[i
].r_addend
= 0;
7333 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7335 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7336 erel
= rel_hdr
->contents
;
7337 if (rel_hdr
->sh_type
== SHT_REL
)
7339 erel
+= (elf_section_data (output_section
)->rel_count
7340 * sizeof (Elf_External_Rel
));
7341 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
7345 irel
[0].r_addend
= addend
;
7346 erel
+= (elf_section_data (output_section
)->rel_count
7347 * sizeof (Elf_External_Rela
));
7348 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
7351 ++elf_section_data (output_section
)->rel_count
;
7356 /* Allocate a pointer to live in a linker created section. */
7359 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7361 struct bfd_link_info
*info
;
7362 elf_linker_section_t
*lsect
;
7363 struct elf_link_hash_entry
*h
;
7364 const Elf_Internal_Rela
*rel
;
7366 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7367 elf_linker_section_pointers_t
*linker_section_ptr
;
7368 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7371 BFD_ASSERT (lsect
!= NULL
);
7373 /* Is this a global symbol? */
7376 /* Has this symbol already been allocated? If so, our work is done. */
7377 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7382 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7383 /* Make sure this symbol is output as a dynamic symbol. */
7384 if (h
->dynindx
== -1)
7386 if (! elf_link_record_dynamic_symbol (info
, h
))
7390 if (lsect
->rel_section
)
7391 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7395 /* Allocation of a pointer to a local symbol. */
7396 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7398 /* Allocate a table to hold the local symbols if first time. */
7401 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7402 register unsigned int i
;
7405 amt
*= sizeof (elf_linker_section_pointers_t
*);
7406 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7411 elf_local_ptr_offsets (abfd
) = ptr
;
7412 for (i
= 0; i
< num_symbols
; i
++)
7413 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7416 /* Has this symbol already been allocated? If so, our work is done. */
7417 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7422 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7426 /* If we are generating a shared object, we need to
7427 output a R_<xxx>_RELATIVE reloc so that the
7428 dynamic linker can adjust this GOT entry. */
7429 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7430 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7434 /* Allocate space for a pointer in the linker section, and allocate
7435 a new pointer record from internal memory. */
7436 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7437 amt
= sizeof (elf_linker_section_pointers_t
);
7438 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7440 if (!linker_section_ptr
)
7443 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7444 linker_section_ptr
->addend
= rel
->r_addend
;
7445 linker_section_ptr
->which
= lsect
->which
;
7446 linker_section_ptr
->written_address_p
= FALSE
;
7447 *ptr_linker_section_ptr
= linker_section_ptr
;
7450 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7452 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7453 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7454 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7455 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7456 if (lsect
->sym_hash
)
7458 /* Bump up symbol value if needed. */
7459 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7461 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7462 lsect
->sym_hash
->root
.root
.string
,
7463 (long) ARCH_SIZE
/ 8,
7464 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7470 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7472 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7476 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7477 lsect
->name
, (long) linker_section_ptr
->offset
,
7478 (long) lsect
->section
->_raw_size
);
7485 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7488 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7491 /* Fill in the address for a pointer generated in a linker section. */
7494 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7495 relocation
, rel
, relative_reloc
)
7498 struct bfd_link_info
*info
;
7499 elf_linker_section_t
*lsect
;
7500 struct elf_link_hash_entry
*h
;
7502 const Elf_Internal_Rela
*rel
;
7505 elf_linker_section_pointers_t
*linker_section_ptr
;
7507 BFD_ASSERT (lsect
!= NULL
);
7511 /* Handle global symbol. */
7512 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7513 (h
->linker_section_pointer
,
7517 BFD_ASSERT (linker_section_ptr
!= NULL
);
7519 if (! elf_hash_table (info
)->dynamic_sections_created
7522 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7524 /* This is actually a static link, or it is a
7525 -Bsymbolic link and the symbol is defined
7526 locally. We must initialize this entry in the
7529 When doing a dynamic link, we create a .rela.<xxx>
7530 relocation entry to initialize the value. This
7531 is done in the finish_dynamic_symbol routine. */
7532 if (!linker_section_ptr
->written_address_p
)
7534 linker_section_ptr
->written_address_p
= TRUE
;
7535 bfd_put_ptr (output_bfd
,
7536 relocation
+ linker_section_ptr
->addend
,
7537 (lsect
->section
->contents
7538 + linker_section_ptr
->offset
));
7544 /* Handle local symbol. */
7545 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7546 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7547 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7548 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7549 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7553 BFD_ASSERT (linker_section_ptr
!= NULL
);
7555 /* Write out pointer if it hasn't been rewritten out before. */
7556 if (!linker_section_ptr
->written_address_p
)
7558 linker_section_ptr
->written_address_p
= TRUE
;
7559 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7560 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7564 asection
*srel
= lsect
->rel_section
;
7565 Elf_Internal_Rela outrel
[MAX_INT_RELS_PER_EXT_REL
];
7567 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7570 /* We need to generate a relative reloc for the dynamic
7574 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7576 lsect
->rel_section
= srel
;
7579 BFD_ASSERT (srel
!= NULL
);
7581 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7583 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7584 + lsect
->section
->output_offset
7585 + linker_section_ptr
->offset
);
7586 outrel
[i
].r_info
= 0;
7587 outrel
[i
].r_addend
= 0;
7589 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7590 erel
= lsect
->section
->contents
;
7591 erel
+= (elf_section_data (lsect
->section
)->rel_count
++
7592 * sizeof (Elf_External_Rela
));
7593 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7598 relocation
= (lsect
->section
->output_offset
7599 + linker_section_ptr
->offset
7600 - lsect
->hole_offset
7601 - lsect
->sym_offset
);
7605 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7606 lsect
->name
, (long) relocation
, (long) relocation
);
7609 /* Subtract out the addend, because it will get added back in by the normal
7611 return relocation
- linker_section_ptr
->addend
;
7614 /* Garbage collect unused sections. */
7616 static bfd_boolean elf_gc_mark
7617 PARAMS ((struct bfd_link_info
*, asection
*,
7618 asection
* (*) (asection
*, struct bfd_link_info
*,
7619 Elf_Internal_Rela
*, struct elf_link_hash_entry
*,
7620 Elf_Internal_Sym
*)));
7622 static bfd_boolean elf_gc_sweep
7623 PARAMS ((struct bfd_link_info
*,
7624 bfd_boolean (*) (bfd
*, struct bfd_link_info
*, asection
*,
7625 const Elf_Internal_Rela
*)));
7627 static bfd_boolean elf_gc_sweep_symbol
7628 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7630 static bfd_boolean elf_gc_allocate_got_offsets
7631 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7633 static bfd_boolean elf_gc_propagate_vtable_entries_used
7634 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7636 static bfd_boolean elf_gc_smash_unused_vtentry_relocs
7637 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7639 /* The mark phase of garbage collection. For a given section, mark
7640 it and any sections in this section's group, and all the sections
7641 which define symbols to which it refers. */
7643 typedef asection
* (*gc_mark_hook_fn
)
7644 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7645 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
7648 elf_gc_mark (info
, sec
, gc_mark_hook
)
7649 struct bfd_link_info
*info
;
7651 gc_mark_hook_fn gc_mark_hook
;
7654 asection
*group_sec
;
7658 /* Mark all the sections in the group. */
7659 group_sec
= elf_section_data (sec
)->next_in_group
;
7660 if (group_sec
&& !group_sec
->gc_mark
)
7661 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7664 /* Look through the section relocs. */
7666 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7668 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7669 Elf_Internal_Shdr
*symtab_hdr
;
7670 struct elf_link_hash_entry
**sym_hashes
;
7673 bfd
*input_bfd
= sec
->owner
;
7674 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7675 Elf_Internal_Sym
*isym
= NULL
;
7677 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7678 sym_hashes
= elf_sym_hashes (input_bfd
);
7680 /* Read the local symbols. */
7681 if (elf_bad_symtab (input_bfd
))
7683 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7687 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7689 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
7690 if (isym
== NULL
&& nlocsyms
!= 0)
7692 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
7698 /* Read the relocations. */
7699 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7700 (input_bfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7701 info
->keep_memory
));
7702 if (relstart
== NULL
)
7707 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7709 for (rel
= relstart
; rel
< relend
; rel
++)
7711 unsigned long r_symndx
;
7713 struct elf_link_hash_entry
*h
;
7715 r_symndx
= ELF_R_SYM (rel
->r_info
);
7719 if (r_symndx
>= nlocsyms
7720 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
7722 h
= sym_hashes
[r_symndx
- extsymoff
];
7723 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
7727 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
7730 if (rsec
&& !rsec
->gc_mark
)
7732 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
7734 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7743 if (elf_section_data (sec
)->relocs
!= relstart
)
7746 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
7748 if (! info
->keep_memory
)
7751 symtab_hdr
->contents
= (unsigned char *) isym
;
7758 /* The sweep phase of garbage collection. Remove all garbage sections. */
7760 typedef bfd_boolean (*gc_sweep_hook_fn
)
7761 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
7762 const Elf_Internal_Rela
*));
7765 elf_gc_sweep (info
, gc_sweep_hook
)
7766 struct bfd_link_info
*info
;
7767 gc_sweep_hook_fn gc_sweep_hook
;
7771 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7775 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7778 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7780 /* Keep special sections. Keep .debug sections. */
7781 if ((o
->flags
& SEC_LINKER_CREATED
)
7782 || (o
->flags
& SEC_DEBUGGING
))
7788 /* Skip sweeping sections already excluded. */
7789 if (o
->flags
& SEC_EXCLUDE
)
7792 /* Since this is early in the link process, it is simple
7793 to remove a section from the output. */
7794 o
->flags
|= SEC_EXCLUDE
;
7796 /* But we also have to update some of the relocation
7797 info we collected before. */
7799 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7801 Elf_Internal_Rela
*internal_relocs
;
7804 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7805 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7806 if (internal_relocs
== NULL
)
7809 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7811 if (elf_section_data (o
)->relocs
!= internal_relocs
)
7812 free (internal_relocs
);
7820 /* Remove the symbols that were in the swept sections from the dynamic
7821 symbol table. GCFIXME: Anyone know how to get them out of the
7822 static symbol table as well? */
7826 elf_link_hash_traverse (elf_hash_table (info
),
7827 elf_gc_sweep_symbol
,
7830 elf_hash_table (info
)->dynsymcount
= i
;
7836 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7839 elf_gc_sweep_symbol (h
, idxptr
)
7840 struct elf_link_hash_entry
*h
;
7843 int *idx
= (int *) idxptr
;
7845 if (h
->root
.type
== bfd_link_hash_warning
)
7846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7848 if (h
->dynindx
!= -1
7849 && ((h
->root
.type
!= bfd_link_hash_defined
7850 && h
->root
.type
!= bfd_link_hash_defweak
)
7851 || h
->root
.u
.def
.section
->gc_mark
))
7852 h
->dynindx
= (*idx
)++;
7857 /* Propogate collected vtable information. This is called through
7858 elf_link_hash_traverse. */
7861 elf_gc_propagate_vtable_entries_used (h
, okp
)
7862 struct elf_link_hash_entry
*h
;
7865 if (h
->root
.type
== bfd_link_hash_warning
)
7866 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7868 /* Those that are not vtables. */
7869 if (h
->vtable_parent
== NULL
)
7872 /* Those vtables that do not have parents, we cannot merge. */
7873 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7876 /* If we've already been done, exit. */
7877 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7880 /* Make sure the parent's table is up to date. */
7881 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7883 if (h
->vtable_entries_used
== NULL
)
7885 /* None of this table's entries were referenced. Re-use the
7887 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7888 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7893 bfd_boolean
*cu
, *pu
;
7895 /* Or the parent's entries into ours. */
7896 cu
= h
->vtable_entries_used
;
7898 pu
= h
->vtable_parent
->vtable_entries_used
;
7901 asection
*sec
= h
->root
.u
.def
.section
;
7902 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7903 int file_align
= bed
->s
->file_align
;
7905 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7920 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7921 struct elf_link_hash_entry
*h
;
7925 bfd_vma hstart
, hend
;
7926 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7927 struct elf_backend_data
*bed
;
7930 if (h
->root
.type
== bfd_link_hash_warning
)
7931 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7933 /* Take care of both those symbols that do not describe vtables as
7934 well as those that are not loaded. */
7935 if (h
->vtable_parent
== NULL
)
7938 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7939 || h
->root
.type
== bfd_link_hash_defweak
);
7941 sec
= h
->root
.u
.def
.section
;
7942 hstart
= h
->root
.u
.def
.value
;
7943 hend
= hstart
+ h
->size
;
7945 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7946 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, TRUE
));
7948 return *(bfd_boolean
*) okp
= FALSE
;
7949 bed
= get_elf_backend_data (sec
->owner
);
7950 file_align
= bed
->s
->file_align
;
7952 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7954 for (rel
= relstart
; rel
< relend
; ++rel
)
7955 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7957 /* If the entry is in use, do nothing. */
7958 if (h
->vtable_entries_used
7959 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7961 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7962 if (h
->vtable_entries_used
[entry
])
7965 /* Otherwise, kill it. */
7966 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7972 /* Do mark and sweep of unused sections. */
7975 elf_gc_sections (abfd
, info
)
7977 struct bfd_link_info
*info
;
7979 bfd_boolean ok
= TRUE
;
7981 asection
* (*gc_mark_hook
)
7982 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7983 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7985 if (!get_elf_backend_data (abfd
)->can_gc_sections
7986 || info
->relocateable
|| info
->emitrelocations
7987 || elf_hash_table (info
)->dynamic_sections_created
)
7990 /* Apply transitive closure to the vtable entry usage info. */
7991 elf_link_hash_traverse (elf_hash_table (info
),
7992 elf_gc_propagate_vtable_entries_used
,
7997 /* Kill the vtable relocations that were not used. */
7998 elf_link_hash_traverse (elf_hash_table (info
),
7999 elf_gc_smash_unused_vtentry_relocs
,
8004 /* Grovel through relocs to find out who stays ... */
8006 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8007 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8011 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8014 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8016 if (o
->flags
& SEC_KEEP
)
8017 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8022 /* ... and mark SEC_EXCLUDE for those that go. */
8023 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8029 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
8032 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
8035 struct elf_link_hash_entry
*h
;
8038 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8039 struct elf_link_hash_entry
**search
, *child
;
8040 bfd_size_type extsymcount
;
8042 /* The sh_info field of the symtab header tells us where the
8043 external symbols start. We don't care about the local symbols at
8045 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
8046 if (!elf_bad_symtab (abfd
))
8047 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8049 sym_hashes
= elf_sym_hashes (abfd
);
8050 sym_hashes_end
= sym_hashes
+ extsymcount
;
8052 /* Hunt down the child symbol, which is in this section at the same
8053 offset as the relocation. */
8054 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8056 if ((child
= *search
) != NULL
8057 && (child
->root
.type
== bfd_link_hash_defined
8058 || child
->root
.type
== bfd_link_hash_defweak
)
8059 && child
->root
.u
.def
.section
== sec
8060 && child
->root
.u
.def
.value
== offset
)
8064 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8065 bfd_archive_filename (abfd
), sec
->name
,
8066 (unsigned long) offset
);
8067 bfd_set_error (bfd_error_invalid_operation
);
8073 /* This *should* only be the absolute section. It could potentially
8074 be that someone has defined a non-global vtable though, which
8075 would be bad. It isn't worth paging in the local symbols to be
8076 sure though; that case should simply be handled by the assembler. */
8078 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8081 child
->vtable_parent
= h
;
8086 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
8089 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
8090 bfd
*abfd ATTRIBUTE_UNUSED
;
8091 asection
*sec ATTRIBUTE_UNUSED
;
8092 struct elf_link_hash_entry
*h
;
8095 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8096 int file_align
= bed
->s
->file_align
;
8098 if (addend
>= h
->vtable_entries_size
)
8101 bfd_boolean
*ptr
= h
->vtable_entries_used
;
8103 /* While the symbol is undefined, we have to be prepared to handle
8105 if (h
->root
.type
== bfd_link_hash_undefined
)
8112 /* Oops! We've got a reference past the defined end of
8113 the table. This is probably a bug -- shall we warn? */
8118 /* Allocate one extra entry for use as a "done" flag for the
8119 consolidation pass. */
8120 bytes
= (size
/ file_align
+ 1) * sizeof (bfd_boolean
);
8124 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
8130 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
8131 * sizeof (bfd_boolean
));
8132 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8136 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
8141 /* And arrange for that done flag to be at index -1. */
8142 h
->vtable_entries_used
= ptr
+ 1;
8143 h
->vtable_entries_size
= size
;
8146 h
->vtable_entries_used
[addend
/ file_align
] = TRUE
;
8151 /* And an accompanying bit to work out final got entry offsets once
8152 we're done. Should be called from final_link. */
8155 elf_gc_common_finalize_got_offsets (abfd
, info
)
8157 struct bfd_link_info
*info
;
8160 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8163 /* The GOT offset is relative to the .got section, but the GOT header is
8164 put into the .got.plt section, if the backend uses it. */
8165 if (bed
->want_got_plt
)
8168 gotoff
= bed
->got_header_size
;
8170 /* Do the local .got entries first. */
8171 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8173 bfd_signed_vma
*local_got
;
8174 bfd_size_type j
, locsymcount
;
8175 Elf_Internal_Shdr
*symtab_hdr
;
8177 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8180 local_got
= elf_local_got_refcounts (i
);
8184 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8185 if (elf_bad_symtab (i
))
8186 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8188 locsymcount
= symtab_hdr
->sh_info
;
8190 for (j
= 0; j
< locsymcount
; ++j
)
8192 if (local_got
[j
] > 0)
8194 local_got
[j
] = gotoff
;
8195 gotoff
+= ARCH_SIZE
/ 8;
8198 local_got
[j
] = (bfd_vma
) -1;
8202 /* Then the global .got entries. .plt refcounts are handled by
8203 adjust_dynamic_symbol */
8204 elf_link_hash_traverse (elf_hash_table (info
),
8205 elf_gc_allocate_got_offsets
,
8210 /* We need a special top-level link routine to convert got reference counts
8211 to real got offsets. */
8214 elf_gc_allocate_got_offsets (h
, offarg
)
8215 struct elf_link_hash_entry
*h
;
8218 bfd_vma
*off
= (bfd_vma
*) offarg
;
8220 if (h
->root
.type
== bfd_link_hash_warning
)
8221 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8223 if (h
->got
.refcount
> 0)
8225 h
->got
.offset
= off
[0];
8226 off
[0] += ARCH_SIZE
/ 8;
8229 h
->got
.offset
= (bfd_vma
) -1;
8234 /* Many folk need no more in the way of final link than this, once
8235 got entry reference counting is enabled. */
8238 elf_gc_common_final_link (abfd
, info
)
8240 struct bfd_link_info
*info
;
8242 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
8245 /* Invoke the regular ELF backend linker to do all the work. */
8246 return elf_bfd_final_link (abfd
, info
);
8249 /* This function will be called though elf_link_hash_traverse to store
8250 all hash value of the exported symbols in an array. */
8253 elf_collect_hash_codes (h
, data
)
8254 struct elf_link_hash_entry
*h
;
8257 unsigned long **valuep
= (unsigned long **) data
;
8263 if (h
->root
.type
== bfd_link_hash_warning
)
8264 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8266 /* Ignore indirect symbols. These are added by the versioning code. */
8267 if (h
->dynindx
== -1)
8270 name
= h
->root
.root
.string
;
8271 p
= strchr (name
, ELF_VER_CHR
);
8274 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8275 memcpy (alc
, name
, (size_t) (p
- name
));
8276 alc
[p
- name
] = '\0';
8280 /* Compute the hash value. */
8281 ha
= bfd_elf_hash (name
);
8283 /* Store the found hash value in the array given as the argument. */
8286 /* And store it in the struct so that we can put it in the hash table
8288 h
->elf_hash_value
= ha
;
8297 elf_reloc_symbol_deleted_p (offset
, cookie
)
8301 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8303 if (rcookie
->bad_symtab
)
8304 rcookie
->rel
= rcookie
->rels
;
8306 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8308 unsigned long r_symndx
;
8310 if (! rcookie
->bad_symtab
)
8311 if (rcookie
->rel
->r_offset
> offset
)
8313 if (rcookie
->rel
->r_offset
!= offset
)
8316 r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8317 if (r_symndx
== SHN_UNDEF
)
8320 if (r_symndx
>= rcookie
->locsymcount
8321 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8323 struct elf_link_hash_entry
*h
;
8325 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8327 while (h
->root
.type
== bfd_link_hash_indirect
8328 || h
->root
.type
== bfd_link_hash_warning
)
8329 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8331 if ((h
->root
.type
== bfd_link_hash_defined
8332 || h
->root
.type
== bfd_link_hash_defweak
)
8333 && elf_discarded_section (h
->root
.u
.def
.section
))
8340 /* It's not a relocation against a global symbol,
8341 but it could be a relocation against a local
8342 symbol for a discarded section. */
8344 Elf_Internal_Sym
*isym
;
8346 /* Need to: get the symbol; get the section. */
8347 isym
= &rcookie
->locsyms
[r_symndx
];
8348 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8350 isec
= section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8351 if (isec
!= NULL
&& elf_discarded_section (isec
))
8360 /* Discard unneeded references to discarded sections.
8361 Returns TRUE if any section's size was changed. */
8362 /* This function assumes that the relocations are in sorted order,
8363 which is true for all known assemblers. */
8366 elf_bfd_discard_info (output_bfd
, info
)
8368 struct bfd_link_info
*info
;
8370 struct elf_reloc_cookie cookie
;
8371 asection
*stab
, *eh
;
8372 Elf_Internal_Shdr
*symtab_hdr
;
8373 struct elf_backend_data
*bed
;
8376 bfd_boolean ret
= FALSE
;
8378 if (info
->traditional_format
8379 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8380 || ! is_elf_hash_table (info
))
8383 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8385 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8388 bed
= get_elf_backend_data (abfd
);
8390 if ((abfd
->flags
& DYNAMIC
) != 0)
8393 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8394 if (info
->relocateable
8396 && (eh
->_raw_size
== 0
8397 || bfd_is_abs_section (eh
->output_section
))))
8400 stab
= bfd_get_section_by_name (abfd
, ".stab");
8402 && (stab
->_raw_size
== 0
8403 || bfd_is_abs_section (stab
->output_section
)
8404 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
8409 && bed
->elf_backend_discard_info
== NULL
)
8412 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8414 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8415 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8416 if (cookie
.bad_symtab
)
8418 cookie
.locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8419 cookie
.extsymoff
= 0;
8423 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8424 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8427 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8428 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8430 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8431 cookie
.locsymcount
, 0,
8433 if (cookie
.locsyms
== NULL
)
8440 count
= stab
->reloc_count
;
8442 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8443 (abfd
, stab
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8444 info
->keep_memory
));
8445 if (cookie
.rels
!= NULL
)
8447 cookie
.rel
= cookie
.rels
;
8448 cookie
.relend
= cookie
.rels
;
8449 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8450 if (_bfd_discard_section_stabs (abfd
, stab
,
8451 elf_section_data (stab
)->sec_info
,
8452 elf_reloc_symbol_deleted_p
,
8455 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8463 count
= eh
->reloc_count
;
8465 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8466 (abfd
, eh
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8467 info
->keep_memory
));
8468 cookie
.rel
= cookie
.rels
;
8469 cookie
.relend
= cookie
.rels
;
8470 if (cookie
.rels
!= NULL
)
8471 cookie
.relend
+= count
* bed
->s
->int_rels_per_ext_rel
;
8473 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
8474 elf_reloc_symbol_deleted_p
,
8478 if (cookie
.rels
!= NULL
8479 && elf_section_data (eh
)->relocs
!= cookie
.rels
)
8483 if (bed
->elf_backend_discard_info
!= NULL
8484 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
8487 if (cookie
.locsyms
!= NULL
8488 && symtab_hdr
->contents
!= (unsigned char *) cookie
.locsyms
)
8490 if (! info
->keep_memory
)
8491 free (cookie
.locsyms
);
8493 symtab_hdr
->contents
= (unsigned char *) cookie
.locsyms
;
8497 if (info
->eh_frame_hdr
8498 && !info
->relocateable
8499 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
8506 elf_section_ignore_discarded_relocs (sec
)
8509 struct elf_backend_data
*bed
;
8511 switch (sec
->sec_info_type
)
8513 case ELF_INFO_TYPE_STABS
:
8514 case ELF_INFO_TYPE_EH_FRAME
:
8520 bed
= get_elf_backend_data (sec
->owner
);
8521 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8522 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))