2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
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 boolean is_global_data_symbol_definition
34 PARAMS ((bfd
*, Elf_Internal_Sym
*));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd
*, carsym
*));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd
*, struct bfd_link_info
*));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd
*, struct bfd_link_info
*));
41 static 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
**, boolean
*, boolean
*,
46 static 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 boolean
*, boolean
, boolean
));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry
*, PTR
));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd
*, struct bfd_link_info
*));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry
*, PTR
));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry
*, PTR
));
60 static boolean elf_link_assign_sym_version
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static boolean elf_collect_hash_codes
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static 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 boolean elf_link_output_relocs
69 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
70 static 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 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 boolean
*defined
= NULL
;
259 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 (boolean
);
281 defined
= (boolean
*) bfd_zmalloc (amt
);
282 included
= (boolean
*) bfd_zmalloc (amt
);
283 if (defined
== (boolean
*) NULL
|| included
== (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
!= (boolean
*) NULL
)
448 if (included
!= (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
;
476 boolean
*type_change_ok
;
477 boolean
*size_change_ok
;
481 struct elf_link_hash_entry
*h
;
484 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, SEC, 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
, sec
, value
,
908 dynsym
, override
, dt_needed
)
910 struct bfd_link_info
*info
;
911 struct elf_link_hash_entry
*h
;
913 Elf_Internal_Sym
*sym
;
920 boolean type_change_ok
;
921 boolean size_change_ok
;
923 struct elf_link_hash_entry
*hi
;
924 struct elf_backend_data
*bed
;
928 size_t len
, shortlen
;
930 /* If this symbol has a version, and it is the default version, we
931 create an indirect symbol from the default name to the fully
932 decorated name. This will cause external references which do not
933 specify a version to be bound to this version of the symbol. */
934 p
= strchr (name
, ELF_VER_CHR
);
935 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
940 /* We are overridden by an old defition. We need to check if we
941 need to create the indirect symbol from the default name. */
942 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, true,
944 BFD_ASSERT (hi
!= NULL
);
947 while (hi
->root
.type
== bfd_link_hash_indirect
948 || hi
->root
.type
== bfd_link_hash_warning
)
950 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
956 bed
= get_elf_backend_data (abfd
);
957 collect
= bed
->collect
;
958 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
961 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
962 if (shortname
== NULL
)
964 memcpy (shortname
, name
, shortlen
);
965 shortname
[shortlen
] = '\0';
967 /* We are going to create a new symbol. Merge it with any existing
968 symbol with this name. For the purposes of the merge, act as
969 though we were defining the symbol we just defined, although we
970 actually going to define an indirect symbol. */
971 type_change_ok
= false;
972 size_change_ok
= false;
973 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
974 &hi
, &override
, &type_change_ok
,
975 &size_change_ok
, dt_needed
))
980 if (! (_bfd_generic_link_add_one_symbol
981 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
982 (bfd_vma
) 0, name
, false, collect
,
983 (struct bfd_link_hash_entry
**) &hi
)))
988 /* In this case the symbol named SHORTNAME is overriding the
989 indirect symbol we want to add. We were planning on making
990 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
991 is the name without a version. NAME is the fully versioned
992 name, and it is the default version.
994 Overriding means that we already saw a definition for the
995 symbol SHORTNAME in a regular object, and it is overriding
996 the symbol defined in the dynamic object.
998 When this happens, we actually want to change NAME, the
999 symbol we just added, to refer to SHORTNAME. This will cause
1000 references to NAME in the shared object to become references
1001 to SHORTNAME in the regular object. This is what we expect
1002 when we override a function in a shared object: that the
1003 references in the shared object will be mapped to the
1004 definition in the regular object. */
1006 while (hi
->root
.type
== bfd_link_hash_indirect
1007 || hi
->root
.type
== bfd_link_hash_warning
)
1008 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1010 h
->root
.type
= bfd_link_hash_indirect
;
1011 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1012 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1014 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1015 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1016 if (hi
->elf_link_hash_flags
1017 & (ELF_LINK_HASH_REF_REGULAR
1018 | ELF_LINK_HASH_DEF_REGULAR
))
1020 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1025 /* Now set HI to H, so that the following code will set the
1026 other fields correctly. */
1030 /* If there is a duplicate definition somewhere, then HI may not
1031 point to an indirect symbol. We will have reported an error to
1032 the user in that case. */
1034 if (hi
->root
.type
== bfd_link_hash_indirect
)
1036 struct elf_link_hash_entry
*ht
;
1038 /* If the symbol became indirect, then we assume that we have
1039 not seen a definition before. */
1040 BFD_ASSERT ((hi
->elf_link_hash_flags
1041 & (ELF_LINK_HASH_DEF_DYNAMIC
1042 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1044 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1045 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1047 /* See if the new flags lead us to realize that the symbol must
1054 || ((hi
->elf_link_hash_flags
1055 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1060 if ((hi
->elf_link_hash_flags
1061 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1067 /* We also need to define an indirection from the nondefault version
1070 len
= strlen (name
);
1071 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1072 if (shortname
== NULL
)
1074 memcpy (shortname
, name
, shortlen
);
1075 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1077 /* Once again, merge with any existing symbol. */
1078 type_change_ok
= false;
1079 size_change_ok
= false;
1080 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
1081 &hi
, &override
, &type_change_ok
,
1082 &size_change_ok
, dt_needed
))
1087 /* Here SHORTNAME is a versioned name, so we don't expect to see
1088 the type of override we do in the case above unless it is
1089 overridden by a versioned definiton. */
1090 if (hi
->root
.type
!= bfd_link_hash_defined
1091 && hi
->root
.type
!= bfd_link_hash_defweak
)
1092 (*_bfd_error_handler
)
1093 (_("%s: warning: unexpected redefinition of indirect versioned symbol `%s'"),
1094 bfd_archive_filename (abfd
), shortname
);
1098 if (! (_bfd_generic_link_add_one_symbol
1099 (info
, abfd
, shortname
, BSF_INDIRECT
,
1100 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1101 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1104 /* If there is a duplicate definition somewhere, then HI may not
1105 point to an indirect symbol. We will have reported an error
1106 to the user in that case. */
1108 if (hi
->root
.type
== bfd_link_hash_indirect
)
1110 /* If the symbol became indirect, then we assume that we have
1111 not seen a definition before. */
1112 BFD_ASSERT ((hi
->elf_link_hash_flags
1113 & (ELF_LINK_HASH_DEF_DYNAMIC
1114 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1116 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1118 /* See if the new flags lead us to realize that the symbol
1125 || ((hi
->elf_link_hash_flags
1126 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1131 if ((hi
->elf_link_hash_flags
1132 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1142 /* Add symbols from an ELF object file to the linker hash table. */
1145 elf_link_add_object_symbols (abfd
, info
)
1147 struct bfd_link_info
*info
;
1149 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
1150 const Elf_Internal_Sym
*,
1151 const char **, flagword
*,
1152 asection
**, bfd_vma
*));
1153 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
1154 asection
*, const Elf_Internal_Rela
*));
1156 Elf_Internal_Shdr
*hdr
;
1157 bfd_size_type symcount
;
1158 bfd_size_type extsymcount
;
1159 bfd_size_type extsymoff
;
1160 struct elf_link_hash_entry
**sym_hash
;
1162 Elf_External_Versym
*extversym
= NULL
;
1163 Elf_External_Versym
*ever
;
1164 struct elf_link_hash_entry
*weaks
;
1165 Elf_Internal_Sym
*isymbuf
= NULL
;
1166 Elf_Internal_Sym
*isym
;
1167 Elf_Internal_Sym
*isymend
;
1168 struct elf_backend_data
*bed
;
1170 struct elf_link_hash_table
* hash_table
;
1173 hash_table
= elf_hash_table (info
);
1175 bed
= get_elf_backend_data (abfd
);
1176 add_symbol_hook
= bed
->elf_add_symbol_hook
;
1177 collect
= bed
->collect
;
1179 if ((abfd
->flags
& DYNAMIC
) == 0)
1185 /* You can't use -r against a dynamic object. Also, there's no
1186 hope of using a dynamic object which does not exactly match
1187 the format of the output file. */
1188 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
1190 bfd_set_error (bfd_error_invalid_operation
);
1195 /* As a GNU extension, any input sections which are named
1196 .gnu.warning.SYMBOL are treated as warning symbols for the given
1197 symbol. This differs from .gnu.warning sections, which generate
1198 warnings when they are included in an output file. */
1203 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1207 name
= bfd_get_section_name (abfd
, s
);
1208 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1213 name
+= sizeof ".gnu.warning." - 1;
1215 /* If this is a shared object, then look up the symbol
1216 in the hash table. If it is there, and it is already
1217 been defined, then we will not be using the entry
1218 from this shared object, so we don't need to warn.
1219 FIXME: If we see the definition in a regular object
1220 later on, we will warn, but we shouldn't. The only
1221 fix is to keep track of what warnings we are supposed
1222 to emit, and then handle them all at the end of the
1224 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
1226 struct elf_link_hash_entry
*h
;
1228 h
= elf_link_hash_lookup (hash_table
, name
,
1229 false, false, true);
1231 /* FIXME: What about bfd_link_hash_common? */
1233 && (h
->root
.type
== bfd_link_hash_defined
1234 || h
->root
.type
== bfd_link_hash_defweak
))
1236 /* We don't want to issue this warning. Clobber
1237 the section size so that the warning does not
1238 get copied into the output file. */
1244 sz
= bfd_section_size (abfd
, s
);
1245 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
1249 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
1254 if (! (_bfd_generic_link_add_one_symbol
1255 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
1256 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
1259 if (! info
->relocateable
)
1261 /* Clobber the section size so that the warning does
1262 not get copied into the output file. */
1272 /* If we are creating a shared library, create all the dynamic
1273 sections immediately. We need to attach them to something,
1274 so we attach them to this BFD, provided it is the right
1275 format. FIXME: If there are no input BFD's of the same
1276 format as the output, we can't make a shared library. */
1278 && is_elf_hash_table (info
)
1279 && ! hash_table
->dynamic_sections_created
1280 && abfd
->xvec
== info
->hash
->creator
)
1282 if (! elf_link_create_dynamic_sections (abfd
, info
))
1286 else if (! is_elf_hash_table (info
))
1293 bfd_size_type oldsize
;
1294 bfd_size_type strindex
;
1296 /* Find the name to use in a DT_NEEDED entry that refers to this
1297 object. If the object has a DT_SONAME entry, we use it.
1298 Otherwise, if the generic linker stuck something in
1299 elf_dt_name, we use that. Otherwise, we just use the file
1300 name. If the generic linker put a null string into
1301 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1302 there is a DT_SONAME entry. */
1304 name
= bfd_get_filename (abfd
);
1305 if (elf_dt_name (abfd
) != NULL
)
1307 name
= elf_dt_name (abfd
);
1310 if (elf_dt_soname (abfd
) != NULL
)
1316 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1319 Elf_External_Dyn
*dynbuf
= NULL
;
1320 Elf_External_Dyn
*extdyn
;
1321 Elf_External_Dyn
*extdynend
;
1323 unsigned long shlink
;
1327 dynbuf
= (Elf_External_Dyn
*) bfd_malloc (s
->_raw_size
);
1331 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1332 (file_ptr
) 0, s
->_raw_size
))
1333 goto error_free_dyn
;
1335 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1337 goto error_free_dyn
;
1338 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1341 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1344 for (; extdyn
< extdynend
; extdyn
++)
1346 Elf_Internal_Dyn dyn
;
1348 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1349 if (dyn
.d_tag
== DT_SONAME
)
1351 unsigned int tagv
= dyn
.d_un
.d_val
;
1352 name
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1354 goto error_free_dyn
;
1356 if (dyn
.d_tag
== DT_NEEDED
)
1358 struct bfd_link_needed_list
*n
, **pn
;
1360 unsigned int tagv
= dyn
.d_un
.d_val
;
1362 amt
= sizeof (struct bfd_link_needed_list
);
1363 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1364 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1365 if (n
== NULL
|| fnm
== NULL
)
1366 goto error_free_dyn
;
1367 amt
= strlen (fnm
) + 1;
1368 anm
= bfd_alloc (abfd
, amt
);
1370 goto error_free_dyn
;
1371 memcpy (anm
, fnm
, (size_t) amt
);
1375 for (pn
= & hash_table
->needed
;
1381 if (dyn
.d_tag
== DT_RUNPATH
)
1383 struct bfd_link_needed_list
*n
, **pn
;
1385 unsigned int tagv
= dyn
.d_un
.d_val
;
1387 /* When we see DT_RPATH before DT_RUNPATH, we have
1388 to clear runpath. Do _NOT_ bfd_release, as that
1389 frees all more recently bfd_alloc'd blocks as
1391 if (rpath
&& hash_table
->runpath
)
1392 hash_table
->runpath
= NULL
;
1394 amt
= sizeof (struct bfd_link_needed_list
);
1395 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1396 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1397 if (n
== NULL
|| fnm
== NULL
)
1398 goto error_free_dyn
;
1399 amt
= strlen (fnm
) + 1;
1400 anm
= bfd_alloc (abfd
, amt
);
1402 goto error_free_dyn
;
1403 memcpy (anm
, fnm
, (size_t) amt
);
1407 for (pn
= & hash_table
->runpath
;
1415 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1416 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1418 struct bfd_link_needed_list
*n
, **pn
;
1420 unsigned int tagv
= dyn
.d_un
.d_val
;
1422 amt
= sizeof (struct bfd_link_needed_list
);
1423 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1424 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1425 if (n
== NULL
|| fnm
== NULL
)
1426 goto error_free_dyn
;
1427 amt
= strlen (fnm
) + 1;
1428 anm
= bfd_alloc (abfd
, amt
);
1435 memcpy (anm
, fnm
, (size_t) amt
);
1439 for (pn
= & hash_table
->runpath
;
1451 /* We do not want to include any of the sections in a dynamic
1452 object in the output file. We hack by simply clobbering the
1453 list of sections in the BFD. This could be handled more
1454 cleanly by, say, a new section flag; the existing
1455 SEC_NEVER_LOAD flag is not the one we want, because that one
1456 still implies that the section takes up space in the output
1458 bfd_section_list_clear (abfd
);
1460 /* If this is the first dynamic object found in the link, create
1461 the special sections required for dynamic linking. */
1462 if (! hash_table
->dynamic_sections_created
)
1463 if (! elf_link_create_dynamic_sections (abfd
, info
))
1468 /* Add a DT_NEEDED entry for this dynamic object. */
1469 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
1470 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, name
, false);
1471 if (strindex
== (bfd_size_type
) -1)
1474 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
1477 Elf_External_Dyn
*dyncon
, *dynconend
;
1479 /* The hash table size did not change, which means that
1480 the dynamic object name was already entered. If we
1481 have already included this dynamic object in the
1482 link, just ignore it. There is no reason to include
1483 a particular dynamic object more than once. */
1484 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
1485 BFD_ASSERT (sdyn
!= NULL
);
1487 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1488 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1490 for (; dyncon
< dynconend
; dyncon
++)
1492 Elf_Internal_Dyn dyn
;
1494 elf_swap_dyn_in (hash_table
->dynobj
, dyncon
, & dyn
);
1495 if (dyn
.d_tag
== DT_NEEDED
1496 && dyn
.d_un
.d_val
== strindex
)
1498 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
1504 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
1508 /* Save the SONAME, if there is one, because sometimes the
1509 linker emulation code will need to know it. */
1511 name
= basename (bfd_get_filename (abfd
));
1512 elf_dt_name (abfd
) = name
;
1515 /* If this is a dynamic object, we always link against the .dynsym
1516 symbol table, not the .symtab symbol table. The dynamic linker
1517 will only see the .dynsym symbol table, so there is no reason to
1518 look at .symtab for a dynamic object. */
1520 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1521 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1523 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1525 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1527 /* The sh_info field of the symtab header tells us where the
1528 external symbols start. We don't care about the local symbols at
1530 if (elf_bad_symtab (abfd
))
1532 extsymcount
= symcount
;
1537 extsymcount
= symcount
- hdr
->sh_info
;
1538 extsymoff
= hdr
->sh_info
;
1542 if (extsymcount
!= 0)
1544 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
1546 if (isymbuf
== NULL
)
1549 /* We store a pointer to the hash table entry for each external
1551 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
1552 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
1553 if (sym_hash
== NULL
)
1554 goto error_free_sym
;
1555 elf_sym_hashes (abfd
) = sym_hash
;
1560 /* Read in any version definitions. */
1561 if (! _bfd_elf_slurp_version_tables (abfd
))
1562 goto error_free_sym
;
1564 /* Read in the symbol versions, but don't bother to convert them
1565 to internal format. */
1566 if (elf_dynversym (abfd
) != 0)
1568 Elf_Internal_Shdr
*versymhdr
;
1570 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1571 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
1572 if (extversym
== NULL
)
1573 goto error_free_sym
;
1574 amt
= versymhdr
->sh_size
;
1575 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1576 || bfd_bread ((PTR
) extversym
, amt
, abfd
) != amt
)
1577 goto error_free_vers
;
1583 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1584 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
1586 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1593 struct elf_link_hash_entry
*h
;
1595 boolean size_change_ok
, type_change_ok
;
1596 boolean new_weakdef
;
1597 unsigned int old_alignment
;
1602 flags
= BSF_NO_FLAGS
;
1604 value
= isym
->st_value
;
1607 bind
= ELF_ST_BIND (isym
->st_info
);
1608 if (bind
== STB_LOCAL
)
1610 /* This should be impossible, since ELF requires that all
1611 global symbols follow all local symbols, and that sh_info
1612 point to the first global symbol. Unfortunatealy, Irix 5
1616 else if (bind
== STB_GLOBAL
)
1618 if (isym
->st_shndx
!= SHN_UNDEF
1619 && isym
->st_shndx
!= SHN_COMMON
)
1622 else if (bind
== STB_WEAK
)
1626 /* Leave it up to the processor backend. */
1629 if (isym
->st_shndx
== SHN_UNDEF
)
1630 sec
= bfd_und_section_ptr
;
1631 else if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
1633 sec
= section_from_elf_index (abfd
, isym
->st_shndx
);
1635 sec
= bfd_abs_section_ptr
;
1636 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1639 else if (isym
->st_shndx
== SHN_ABS
)
1640 sec
= bfd_abs_section_ptr
;
1641 else if (isym
->st_shndx
== SHN_COMMON
)
1643 sec
= bfd_com_section_ptr
;
1644 /* What ELF calls the size we call the value. What ELF
1645 calls the value we call the alignment. */
1646 value
= isym
->st_size
;
1650 /* Leave it up to the processor backend. */
1653 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
1655 if (name
== (const char *) NULL
)
1656 goto error_free_vers
;
1658 if (isym
->st_shndx
== SHN_COMMON
1659 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
)
1661 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
1665 tcomm
= bfd_make_section (abfd
, ".tcommon");
1667 || !bfd_set_section_flags (abfd
, tcomm
, (SEC_ALLOC
1669 | SEC_LINKER_CREATED
1670 | SEC_THREAD_LOCAL
)))
1671 goto error_free_vers
;
1675 else if (add_symbol_hook
)
1677 if (! (*add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
, &sec
,
1679 goto error_free_vers
;
1681 /* The hook function sets the name to NULL if this symbol
1682 should be skipped for some reason. */
1683 if (name
== (const char *) NULL
)
1687 /* Sanity check that all possibilities were handled. */
1688 if (sec
== (asection
*) NULL
)
1690 bfd_set_error (bfd_error_bad_value
);
1691 goto error_free_vers
;
1694 if (bfd_is_und_section (sec
)
1695 || bfd_is_com_section (sec
))
1700 size_change_ok
= false;
1701 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1703 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1705 Elf_Internal_Versym iver
;
1706 unsigned int vernum
= 0;
1710 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1711 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1713 /* If this is a hidden symbol, or if it is not version
1714 1, we append the version name to the symbol name.
1715 However, we do not modify a non-hidden absolute
1716 symbol, because it might be the version symbol
1717 itself. FIXME: What if it isn't? */
1718 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1719 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1722 size_t namelen
, verlen
, newlen
;
1725 if (isym
->st_shndx
!= SHN_UNDEF
)
1727 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1729 (*_bfd_error_handler
)
1730 (_("%s: %s: invalid version %u (max %d)"),
1731 bfd_archive_filename (abfd
), name
, vernum
,
1732 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1733 bfd_set_error (bfd_error_bad_value
);
1734 goto error_free_vers
;
1736 else if (vernum
> 1)
1738 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1744 /* We cannot simply test for the number of
1745 entries in the VERNEED section since the
1746 numbers for the needed versions do not start
1748 Elf_Internal_Verneed
*t
;
1751 for (t
= elf_tdata (abfd
)->verref
;
1755 Elf_Internal_Vernaux
*a
;
1757 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1759 if (a
->vna_other
== vernum
)
1761 verstr
= a
->vna_nodename
;
1770 (*_bfd_error_handler
)
1771 (_("%s: %s: invalid needed version %d"),
1772 bfd_archive_filename (abfd
), name
, vernum
);
1773 bfd_set_error (bfd_error_bad_value
);
1774 goto error_free_vers
;
1778 namelen
= strlen (name
);
1779 verlen
= strlen (verstr
);
1780 newlen
= namelen
+ verlen
+ 2;
1781 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1782 && isym
->st_shndx
!= SHN_UNDEF
)
1785 newname
= (char *) bfd_alloc (abfd
, (bfd_size_type
) newlen
);
1786 if (newname
== NULL
)
1787 goto error_free_vers
;
1788 memcpy (newname
, name
, namelen
);
1789 p
= newname
+ namelen
;
1791 /* If this is a defined non-hidden version symbol,
1792 we add another @ to the name. This indicates the
1793 default version of the symbol. */
1794 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1795 && isym
->st_shndx
!= SHN_UNDEF
)
1797 memcpy (p
, verstr
, verlen
+ 1);
1803 if (! elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
1804 sym_hash
, &override
, &type_change_ok
,
1805 &size_change_ok
, dt_needed
))
1806 goto error_free_vers
;
1812 while (h
->root
.type
== bfd_link_hash_indirect
1813 || h
->root
.type
== bfd_link_hash_warning
)
1814 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1816 /* Remember the old alignment if this is a common symbol, so
1817 that we don't reduce the alignment later on. We can't
1818 check later, because _bfd_generic_link_add_one_symbol
1819 will set a default for the alignment which we want to
1821 if (h
->root
.type
== bfd_link_hash_common
)
1822 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1824 if (elf_tdata (abfd
)->verdef
!= NULL
1828 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1831 if (! (_bfd_generic_link_add_one_symbol
1832 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1833 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1834 goto error_free_vers
;
1837 while (h
->root
.type
== bfd_link_hash_indirect
1838 || h
->root
.type
== bfd_link_hash_warning
)
1839 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1842 new_weakdef
= false;
1845 && (flags
& BSF_WEAK
) != 0
1846 && ELF_ST_TYPE (isym
->st_info
) != STT_FUNC
1847 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1848 && h
->weakdef
== NULL
)
1850 /* Keep a list of all weak defined non function symbols from
1851 a dynamic object, using the weakdef field. Later in this
1852 function we will set the weakdef field to the correct
1853 value. We only put non-function symbols from dynamic
1854 objects on this list, because that happens to be the only
1855 time we need to know the normal symbol corresponding to a
1856 weak symbol, and the information is time consuming to
1857 figure out. If the weakdef field is not already NULL,
1858 then this symbol was already defined by some previous
1859 dynamic object, and we will be using that previous
1860 definition anyhow. */
1867 /* Set the alignment of a common symbol. */
1868 if (isym
->st_shndx
== SHN_COMMON
1869 && h
->root
.type
== bfd_link_hash_common
)
1873 align
= bfd_log2 (isym
->st_value
);
1874 if (align
> old_alignment
1875 /* Permit an alignment power of zero if an alignment of one
1876 is specified and no other alignments have been specified. */
1877 || (isym
->st_value
== 1 && old_alignment
== 0))
1878 h
->root
.u
.c
.p
->alignment_power
= align
;
1881 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1887 /* Remember the symbol size and type. */
1888 if (isym
->st_size
!= 0
1889 && (definition
|| h
->size
== 0))
1891 if (h
->size
!= 0 && h
->size
!= isym
->st_size
&& ! size_change_ok
)
1892 (*_bfd_error_handler
)
1893 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1894 name
, (unsigned long) h
->size
,
1895 (unsigned long) isym
->st_size
, bfd_archive_filename (abfd
));
1897 h
->size
= isym
->st_size
;
1900 /* If this is a common symbol, then we always want H->SIZE
1901 to be the size of the common symbol. The code just above
1902 won't fix the size if a common symbol becomes larger. We
1903 don't warn about a size change here, because that is
1904 covered by --warn-common. */
1905 if (h
->root
.type
== bfd_link_hash_common
)
1906 h
->size
= h
->root
.u
.c
.size
;
1908 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
1909 && (definition
|| h
->type
== STT_NOTYPE
))
1911 if (h
->type
!= STT_NOTYPE
1912 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
1913 && ! type_change_ok
)
1914 (*_bfd_error_handler
)
1915 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1916 name
, h
->type
, ELF_ST_TYPE (isym
->st_info
),
1917 bfd_archive_filename (abfd
));
1919 h
->type
= ELF_ST_TYPE (isym
->st_info
);
1922 /* If st_other has a processor-specific meaning, specific code
1923 might be needed here. */
1924 if (isym
->st_other
!= 0)
1926 /* Combine visibilities, using the most constraining one. */
1927 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1928 unsigned char symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
1930 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1931 h
->other
= isym
->st_other
;
1933 /* If neither has visibility, use the st_other of the
1934 definition. This is an arbitrary choice, since the
1935 other bits have no general meaning. */
1936 if (!symvis
&& !hvis
1937 && (definition
|| h
->other
== 0))
1938 h
->other
= isym
->st_other
;
1941 /* Set a flag in the hash table entry indicating the type of
1942 reference or definition we just found. Keep a count of
1943 the number of dynamic symbols we find. A dynamic symbol
1944 is one which is referenced or defined by both a regular
1945 object and a shared object. */
1946 old_flags
= h
->elf_link_hash_flags
;
1952 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1953 if (bind
!= STB_WEAK
)
1954 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1957 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1959 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1960 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1966 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1968 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1969 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1970 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1971 || (h
->weakdef
!= NULL
1973 && h
->weakdef
->dynindx
!= -1))
1977 h
->elf_link_hash_flags
|= new_flag
;
1979 /* Check to see if we need to add an indirect symbol for
1980 the default name. */
1981 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
1982 if (! elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
1983 &sec
, &value
, &dynsym
,
1984 override
, dt_needed
))
1985 goto error_free_vers
;
1987 if (dynsym
&& h
->dynindx
== -1)
1989 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1990 goto error_free_vers
;
1991 if (h
->weakdef
!= NULL
1993 && h
->weakdef
->dynindx
== -1)
1995 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1996 goto error_free_vers
;
1999 else if (dynsym
&& h
->dynindx
!= -1)
2000 /* If the symbol already has a dynamic index, but
2001 visibility says it should not be visible, turn it into
2003 switch (ELF_ST_VISIBILITY (h
->other
))
2007 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2011 if (dt_needed
&& definition
2012 && (h
->elf_link_hash_flags
2013 & ELF_LINK_HASH_REF_REGULAR
) != 0)
2015 bfd_size_type oldsize
;
2016 bfd_size_type strindex
;
2018 if (! is_elf_hash_table (info
))
2019 goto error_free_vers
;
2021 /* The symbol from a DT_NEEDED object is referenced from
2022 the regular object to create a dynamic executable. We
2023 have to make sure there is a DT_NEEDED entry for it. */
2026 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2027 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
,
2028 elf_dt_soname (abfd
), false);
2029 if (strindex
== (bfd_size_type
) -1)
2030 goto error_free_vers
;
2032 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2035 Elf_External_Dyn
*dyncon
, *dynconend
;
2037 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
,
2039 BFD_ASSERT (sdyn
!= NULL
);
2041 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
2042 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
2044 for (; dyncon
< dynconend
; dyncon
++)
2046 Elf_Internal_Dyn dyn
;
2048 elf_swap_dyn_in (hash_table
->dynobj
,
2050 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
2051 dyn
.d_un
.d_val
!= strindex
);
2055 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
2056 goto error_free_vers
;
2061 if (extversym
!= NULL
)
2067 if (isymbuf
!= NULL
)
2071 /* Now set the weakdefs field correctly for all the weak defined
2072 symbols we found. The only way to do this is to search all the
2073 symbols. Since we only need the information for non functions in
2074 dynamic objects, that's the only time we actually put anything on
2075 the list WEAKS. We need this information so that if a regular
2076 object refers to a symbol defined weakly in a dynamic object, the
2077 real symbol in the dynamic object is also put in the dynamic
2078 symbols; we also must arrange for both symbols to point to the
2079 same memory location. We could handle the general case of symbol
2080 aliasing, but a general symbol alias can only be generated in
2081 assembler code, handling it correctly would be very time
2082 consuming, and other ELF linkers don't handle general aliasing
2084 while (weaks
!= NULL
)
2086 struct elf_link_hash_entry
*hlook
;
2089 struct elf_link_hash_entry
**hpp
;
2090 struct elf_link_hash_entry
**hppend
;
2093 weaks
= hlook
->weakdef
;
2094 hlook
->weakdef
= NULL
;
2096 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2097 || hlook
->root
.type
== bfd_link_hash_defweak
2098 || hlook
->root
.type
== bfd_link_hash_common
2099 || hlook
->root
.type
== bfd_link_hash_indirect
);
2100 slook
= hlook
->root
.u
.def
.section
;
2101 vlook
= hlook
->root
.u
.def
.value
;
2103 hpp
= elf_sym_hashes (abfd
);
2104 hppend
= hpp
+ extsymcount
;
2105 for (; hpp
< hppend
; hpp
++)
2107 struct elf_link_hash_entry
*h
;
2110 if (h
!= NULL
&& h
!= hlook
2111 && h
->root
.type
== bfd_link_hash_defined
2112 && h
->root
.u
.def
.section
== slook
2113 && h
->root
.u
.def
.value
== vlook
)
2117 /* If the weak definition is in the list of dynamic
2118 symbols, make sure the real definition is put there
2120 if (hlook
->dynindx
!= -1
2121 && h
->dynindx
== -1)
2123 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2127 /* If the real definition is in the list of dynamic
2128 symbols, make sure the weak definition is put there
2129 as well. If we don't do this, then the dynamic
2130 loader might not merge the entries for the real
2131 definition and the weak definition. */
2132 if (h
->dynindx
!= -1
2133 && hlook
->dynindx
== -1)
2135 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2143 /* If this object is the same format as the output object, and it is
2144 not a shared library, then let the backend look through the
2147 This is required to build global offset table entries and to
2148 arrange for dynamic relocs. It is not required for the
2149 particular common case of linking non PIC code, even when linking
2150 against shared libraries, but unfortunately there is no way of
2151 knowing whether an object file has been compiled PIC or not.
2152 Looking through the relocs is not particularly time consuming.
2153 The problem is that we must either (1) keep the relocs in memory,
2154 which causes the linker to require additional runtime memory or
2155 (2) read the relocs twice from the input file, which wastes time.
2156 This would be a good case for using mmap.
2158 I have no idea how to handle linking PIC code into a file of a
2159 different format. It probably can't be done. */
2160 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2162 && abfd
->xvec
== info
->hash
->creator
2163 && check_relocs
!= NULL
)
2167 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2169 Elf_Internal_Rela
*internal_relocs
;
2172 if ((o
->flags
& SEC_RELOC
) == 0
2173 || o
->reloc_count
== 0
2174 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2175 && (o
->flags
& SEC_DEBUGGING
) != 0)
2176 || bfd_is_abs_section (o
->output_section
))
2179 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2180 (abfd
, o
, (PTR
) NULL
,
2181 (Elf_Internal_Rela
*) NULL
,
2182 info
->keep_memory
));
2183 if (internal_relocs
== NULL
)
2186 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2188 if (elf_section_data (o
)->relocs
!= internal_relocs
)
2189 free (internal_relocs
);
2196 /* If this is a non-traditional, non-relocateable link, try to
2197 optimize the handling of the .stab/.stabstr sections. */
2199 && ! info
->relocateable
2200 && ! info
->traditional_format
2201 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2202 && is_elf_hash_table (info
)
2203 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2205 asection
*stab
, *stabstr
;
2207 stab
= bfd_get_section_by_name (abfd
, ".stab");
2209 && (stab
->flags
& SEC_MERGE
) == 0
2210 && !bfd_is_abs_section (stab
->output_section
))
2212 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2214 if (stabstr
!= NULL
)
2216 struct bfd_elf_section_data
*secdata
;
2218 secdata
= elf_section_data (stab
);
2219 if (! _bfd_link_section_stabs (abfd
,
2220 & hash_table
->stab_info
,
2222 &secdata
->sec_info
))
2224 if (secdata
->sec_info
)
2225 secdata
->sec_info_type
= ELF_INFO_TYPE_STABS
;
2230 if (! info
->relocateable
&& ! dynamic
2231 && is_elf_hash_table (info
))
2235 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2236 if ((s
->flags
& SEC_MERGE
) != 0
2237 && !bfd_is_abs_section (s
->output_section
))
2239 struct bfd_elf_section_data
*secdata
;
2241 secdata
= elf_section_data (s
);
2242 if (! _bfd_merge_section (abfd
,
2243 & hash_table
->merge_info
,
2244 s
, &secdata
->sec_info
))
2246 else if (secdata
->sec_info
)
2247 secdata
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
2251 if (is_elf_hash_table (info
))
2253 /* Add this bfd to the loaded list. */
2254 struct elf_link_loaded_list
*n
;
2256 n
= ((struct elf_link_loaded_list
*)
2257 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
)));
2261 n
->next
= hash_table
->loaded
;
2262 hash_table
->loaded
= n
;
2268 if (extversym
!= NULL
)
2271 if (isymbuf
!= NULL
)
2277 /* Create some sections which will be filled in with dynamic linking
2278 information. ABFD is an input file which requires dynamic sections
2279 to be created. The dynamic sections take up virtual memory space
2280 when the final executable is run, so we need to create them before
2281 addresses are assigned to the output sections. We work out the
2282 actual contents and size of these sections later. */
2285 elf_link_create_dynamic_sections (abfd
, info
)
2287 struct bfd_link_info
*info
;
2290 register asection
*s
;
2291 struct elf_link_hash_entry
*h
;
2292 struct elf_backend_data
*bed
;
2294 if (! is_elf_hash_table (info
))
2297 if (elf_hash_table (info
)->dynamic_sections_created
)
2300 /* Make sure that all dynamic sections use the same input BFD. */
2301 if (elf_hash_table (info
)->dynobj
== NULL
)
2302 elf_hash_table (info
)->dynobj
= abfd
;
2304 abfd
= elf_hash_table (info
)->dynobj
;
2306 /* Note that we set the SEC_IN_MEMORY flag for all of these
2308 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2309 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2311 /* A dynamically linked executable has a .interp section, but a
2312 shared library does not. */
2315 s
= bfd_make_section (abfd
, ".interp");
2317 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2321 if (! info
->traditional_format
2322 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
2324 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
2326 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2327 || ! bfd_set_section_alignment (abfd
, s
, 2))
2331 /* Create sections to hold version informations. These are removed
2332 if they are not needed. */
2333 s
= bfd_make_section (abfd
, ".gnu.version_d");
2335 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2336 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2339 s
= bfd_make_section (abfd
, ".gnu.version");
2341 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2342 || ! bfd_set_section_alignment (abfd
, s
, 1))
2345 s
= bfd_make_section (abfd
, ".gnu.version_r");
2347 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2348 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2351 s
= bfd_make_section (abfd
, ".dynsym");
2353 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2354 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2357 s
= bfd_make_section (abfd
, ".dynstr");
2359 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2362 /* Create a strtab to hold the dynamic symbol names. */
2363 if (elf_hash_table (info
)->dynstr
== NULL
)
2365 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
2366 if (elf_hash_table (info
)->dynstr
== NULL
)
2370 s
= bfd_make_section (abfd
, ".dynamic");
2372 || ! bfd_set_section_flags (abfd
, s
, flags
)
2373 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2376 /* The special symbol _DYNAMIC is always set to the start of the
2377 .dynamic section. This call occurs before we have processed the
2378 symbols for any dynamic object, so we don't have to worry about
2379 overriding a dynamic definition. We could set _DYNAMIC in a
2380 linker script, but we only want to define it if we are, in fact,
2381 creating a .dynamic section. We don't want to define it if there
2382 is no .dynamic section, since on some ELF platforms the start up
2383 code examines it to decide how to initialize the process. */
2385 if (! (_bfd_generic_link_add_one_symbol
2386 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2387 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2388 (struct bfd_link_hash_entry
**) &h
)))
2390 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2391 h
->type
= STT_OBJECT
;
2394 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2397 bed
= get_elf_backend_data (abfd
);
2399 s
= bfd_make_section (abfd
, ".hash");
2401 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2402 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2404 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2406 /* Let the backend create the rest of the sections. This lets the
2407 backend set the right flags. The backend will normally create
2408 the .got and .plt sections. */
2409 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2412 elf_hash_table (info
)->dynamic_sections_created
= true;
2417 /* Add an entry to the .dynamic table. */
2420 elf_add_dynamic_entry (info
, tag
, val
)
2421 struct bfd_link_info
*info
;
2425 Elf_Internal_Dyn dyn
;
2428 bfd_size_type newsize
;
2429 bfd_byte
*newcontents
;
2431 if (! is_elf_hash_table (info
))
2434 dynobj
= elf_hash_table (info
)->dynobj
;
2436 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2437 BFD_ASSERT (s
!= NULL
);
2439 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2440 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2441 if (newcontents
== NULL
)
2445 dyn
.d_un
.d_val
= val
;
2446 elf_swap_dyn_out (dynobj
, &dyn
,
2447 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2449 s
->_raw_size
= newsize
;
2450 s
->contents
= newcontents
;
2455 /* Read and swap the relocs from the section indicated by SHDR. This
2456 may be either a REL or a RELA section. The relocations are
2457 translated into RELA relocations and stored in INTERNAL_RELOCS,
2458 which should have already been allocated to contain enough space.
2459 The EXTERNAL_RELOCS are a buffer where the external form of the
2460 relocations should be stored.
2462 Returns false if something goes wrong. */
2465 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2468 Elf_Internal_Shdr
*shdr
;
2469 PTR external_relocs
;
2470 Elf_Internal_Rela
*internal_relocs
;
2472 struct elf_backend_data
*bed
;
2475 /* If there aren't any relocations, that's OK. */
2479 /* Position ourselves at the start of the section. */
2480 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2483 /* Read the relocations. */
2484 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2487 bed
= get_elf_backend_data (abfd
);
2489 /* Convert the external relocations to the internal format. */
2490 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2492 Elf_External_Rel
*erel
;
2493 Elf_External_Rel
*erelend
;
2494 Elf_Internal_Rela
*irela
;
2495 Elf_Internal_Rel
*irel
;
2497 erel
= (Elf_External_Rel
*) external_relocs
;
2498 erelend
= erel
+ NUM_SHDR_ENTRIES (shdr
);
2499 irela
= internal_relocs
;
2500 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
2501 irel
= bfd_alloc (abfd
, amt
);
2502 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2506 if (bed
->s
->swap_reloc_in
)
2507 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2509 elf_swap_reloc_in (abfd
, erel
, irel
);
2511 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2513 irela
[i
].r_offset
= irel
[i
].r_offset
;
2514 irela
[i
].r_info
= irel
[i
].r_info
;
2515 irela
[i
].r_addend
= 0;
2521 Elf_External_Rela
*erela
;
2522 Elf_External_Rela
*erelaend
;
2523 Elf_Internal_Rela
*irela
;
2525 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2527 erela
= (Elf_External_Rela
*) external_relocs
;
2528 erelaend
= erela
+ NUM_SHDR_ENTRIES (shdr
);
2529 irela
= internal_relocs
;
2530 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2532 if (bed
->s
->swap_reloca_in
)
2533 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2535 elf_swap_reloca_in (abfd
, erela
, irela
);
2542 /* Read and swap the relocs for a section O. They may have been
2543 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2544 not NULL, they are used as buffers to read into. They are known to
2545 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2546 the return value is allocated using either malloc or bfd_alloc,
2547 according to the KEEP_MEMORY argument. If O has two relocation
2548 sections (both REL and RELA relocations), then the REL_HDR
2549 relocations will appear first in INTERNAL_RELOCS, followed by the
2550 REL_HDR2 relocations. */
2553 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2557 PTR external_relocs
;
2558 Elf_Internal_Rela
*internal_relocs
;
2559 boolean keep_memory
;
2561 Elf_Internal_Shdr
*rel_hdr
;
2563 Elf_Internal_Rela
*alloc2
= NULL
;
2564 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2566 if (elf_section_data (o
)->relocs
!= NULL
)
2567 return elf_section_data (o
)->relocs
;
2569 if (o
->reloc_count
== 0)
2572 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2574 if (internal_relocs
== NULL
)
2578 size
= o
->reloc_count
;
2579 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2581 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2583 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2584 if (internal_relocs
== NULL
)
2588 if (external_relocs
== NULL
)
2590 bfd_size_type size
= rel_hdr
->sh_size
;
2592 if (elf_section_data (o
)->rel_hdr2
)
2593 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2594 alloc1
= (PTR
) bfd_malloc (size
);
2597 external_relocs
= alloc1
;
2600 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2604 if (!elf_link_read_relocs_from_section
2606 elf_section_data (o
)->rel_hdr2
,
2607 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2608 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2609 * bed
->s
->int_rels_per_ext_rel
)))
2612 /* Cache the results for next time, if we can. */
2614 elf_section_data (o
)->relocs
= internal_relocs
;
2619 /* Don't free alloc2, since if it was allocated we are passing it
2620 back (under the name of internal_relocs). */
2622 return internal_relocs
;
2632 /* Record an assignment to a symbol made by a linker script. We need
2633 this in case some dynamic object refers to this symbol. */
2636 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2637 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2638 struct bfd_link_info
*info
;
2642 struct elf_link_hash_entry
*h
;
2644 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2647 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2651 if (h
->root
.type
== bfd_link_hash_new
)
2652 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
2654 /* If this symbol is being provided by the linker script, and it is
2655 currently defined by a dynamic object, but not by a regular
2656 object, then mark it as undefined so that the generic linker will
2657 force the correct value. */
2659 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2660 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2661 h
->root
.type
= bfd_link_hash_undefined
;
2663 /* If this symbol is not being provided by the linker script, and it is
2664 currently defined by a dynamic object, but not by a regular object,
2665 then clear out any version information because the symbol will not be
2666 associated with the dynamic object any more. */
2668 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2669 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2670 h
->verinfo
.verdef
= NULL
;
2672 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2674 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2675 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2677 && h
->dynindx
== -1)
2679 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2682 /* If this is a weak defined symbol, and we know a corresponding
2683 real symbol from the same dynamic object, make sure the real
2684 symbol is also made into a dynamic symbol. */
2685 if (h
->weakdef
!= NULL
2686 && h
->weakdef
->dynindx
== -1)
2688 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2696 /* This structure is used to pass information to
2697 elf_link_assign_sym_version. */
2699 struct elf_assign_sym_version_info
2703 /* General link information. */
2704 struct bfd_link_info
*info
;
2706 struct bfd_elf_version_tree
*verdefs
;
2707 /* Whether we had a failure. */
2711 /* This structure is used to pass information to
2712 elf_link_find_version_dependencies. */
2714 struct elf_find_verdep_info
2718 /* General link information. */
2719 struct bfd_link_info
*info
;
2720 /* The number of dependencies. */
2722 /* Whether we had a failure. */
2726 /* Array used to determine the number of hash table buckets to use
2727 based on the number of symbols there are. If there are fewer than
2728 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2729 fewer than 37 we use 17 buckets, and so forth. We never use more
2730 than 32771 buckets. */
2732 static const size_t elf_buckets
[] =
2734 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2738 /* Compute bucket count for hashing table. We do not use a static set
2739 of possible tables sizes anymore. Instead we determine for all
2740 possible reasonable sizes of the table the outcome (i.e., the
2741 number of collisions etc) and choose the best solution. The
2742 weighting functions are not too simple to allow the table to grow
2743 without bounds. Instead one of the weighting factors is the size.
2744 Therefore the result is always a good payoff between few collisions
2745 (= short chain lengths) and table size. */
2747 compute_bucket_count (info
)
2748 struct bfd_link_info
*info
;
2750 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2751 size_t best_size
= 0;
2752 unsigned long int *hashcodes
;
2753 unsigned long int *hashcodesp
;
2754 unsigned long int i
;
2757 /* Compute the hash values for all exported symbols. At the same
2758 time store the values in an array so that we could use them for
2761 amt
*= sizeof (unsigned long int);
2762 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
2763 if (hashcodes
== NULL
)
2765 hashcodesp
= hashcodes
;
2767 /* Put all hash values in HASHCODES. */
2768 elf_link_hash_traverse (elf_hash_table (info
),
2769 elf_collect_hash_codes
, &hashcodesp
);
2771 /* We have a problem here. The following code to optimize the table
2772 size requires an integer type with more the 32 bits. If
2773 BFD_HOST_U_64_BIT is set we know about such a type. */
2774 #ifdef BFD_HOST_U_64_BIT
2777 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2780 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2781 unsigned long int *counts
;
2783 /* Possible optimization parameters: if we have NSYMS symbols we say
2784 that the hashing table must at least have NSYMS/4 and at most
2786 minsize
= nsyms
/ 4;
2789 best_size
= maxsize
= nsyms
* 2;
2791 /* Create array where we count the collisions in. We must use bfd_malloc
2792 since the size could be large. */
2794 amt
*= sizeof (unsigned long int);
2795 counts
= (unsigned long int *) bfd_malloc (amt
);
2802 /* Compute the "optimal" size for the hash table. The criteria is a
2803 minimal chain length. The minor criteria is (of course) the size
2805 for (i
= minsize
; i
< maxsize
; ++i
)
2807 /* Walk through the array of hashcodes and count the collisions. */
2808 BFD_HOST_U_64_BIT max
;
2809 unsigned long int j
;
2810 unsigned long int fact
;
2812 memset (counts
, '\0', i
* sizeof (unsigned long int));
2814 /* Determine how often each hash bucket is used. */
2815 for (j
= 0; j
< nsyms
; ++j
)
2816 ++counts
[hashcodes
[j
] % i
];
2818 /* For the weight function we need some information about the
2819 pagesize on the target. This is information need not be 100%
2820 accurate. Since this information is not available (so far) we
2821 define it here to a reasonable default value. If it is crucial
2822 to have a better value some day simply define this value. */
2823 # ifndef BFD_TARGET_PAGESIZE
2824 # define BFD_TARGET_PAGESIZE (4096)
2827 /* We in any case need 2 + NSYMS entries for the size values and
2829 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2832 /* Variant 1: optimize for short chains. We add the squares
2833 of all the chain lengths (which favous many small chain
2834 over a few long chains). */
2835 for (j
= 0; j
< i
; ++j
)
2836 max
+= counts
[j
] * counts
[j
];
2838 /* This adds penalties for the overall size of the table. */
2839 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2842 /* Variant 2: Optimize a lot more for small table. Here we
2843 also add squares of the size but we also add penalties for
2844 empty slots (the +1 term). */
2845 for (j
= 0; j
< i
; ++j
)
2846 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2848 /* The overall size of the table is considered, but not as
2849 strong as in variant 1, where it is squared. */
2850 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2854 /* Compare with current best results. */
2855 if (max
< best_chlen
)
2865 #endif /* defined (BFD_HOST_U_64_BIT) */
2867 /* This is the fallback solution if no 64bit type is available or if we
2868 are not supposed to spend much time on optimizations. We select the
2869 bucket count using a fixed set of numbers. */
2870 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2872 best_size
= elf_buckets
[i
];
2873 if (dynsymcount
< elf_buckets
[i
+ 1])
2878 /* Free the arrays we needed. */
2884 /* Set up the sizes and contents of the ELF dynamic sections. This is
2885 called by the ELF linker emulation before_allocation routine. We
2886 must set the sizes of the sections before the linker sets the
2887 addresses of the various sections. */
2890 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2892 auxiliary_filters
, info
, sinterpptr
,
2897 const char *filter_shlib
;
2898 const char * const *auxiliary_filters
;
2899 struct bfd_link_info
*info
;
2900 asection
**sinterpptr
;
2901 struct bfd_elf_version_tree
*verdefs
;
2903 bfd_size_type soname_indx
;
2905 struct elf_backend_data
*bed
;
2906 struct elf_assign_sym_version_info asvinfo
;
2910 soname_indx
= (bfd_size_type
) -1;
2912 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2915 if (! is_elf_hash_table (info
))
2918 /* Any syms created from now on start with -1 in
2919 got.refcount/offset and plt.refcount/offset. */
2920 elf_hash_table (info
)->init_refcount
= -1;
2922 /* The backend may have to create some sections regardless of whether
2923 we're dynamic or not. */
2924 bed
= get_elf_backend_data (output_bfd
);
2925 if (bed
->elf_backend_always_size_sections
2926 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2929 dynobj
= elf_hash_table (info
)->dynobj
;
2931 /* If there were no dynamic objects in the link, there is nothing to
2936 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
2939 if (elf_hash_table (info
)->dynamic_sections_created
)
2941 struct elf_info_failed eif
;
2942 struct elf_link_hash_entry
*h
;
2944 struct bfd_elf_version_tree
*t
;
2945 struct bfd_elf_version_expr
*d
;
2946 boolean all_defined
;
2948 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2949 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2953 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
2955 if (soname_indx
== (bfd_size_type
) -1
2956 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SONAME
,
2963 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMBOLIC
,
2966 info
->flags
|= DF_SYMBOLIC
;
2973 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2975 if (info
->new_dtags
)
2976 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
2977 if (indx
== (bfd_size_type
) -1
2978 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RPATH
, indx
)
2980 && ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RUNPATH
,
2985 if (filter_shlib
!= NULL
)
2989 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
2990 filter_shlib
, true);
2991 if (indx
== (bfd_size_type
) -1
2992 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FILTER
, indx
))
2996 if (auxiliary_filters
!= NULL
)
2998 const char * const *p
;
3000 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
3004 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3006 if (indx
== (bfd_size_type
) -1
3007 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_AUXILIARY
,
3014 eif
.verdefs
= verdefs
;
3017 /* If we are supposed to export all symbols into the dynamic symbol
3018 table (this is not the normal case), then do so. */
3019 if (info
->export_dynamic
)
3021 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
3027 /* Make all global versions with definiton. */
3028 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3029 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3030 if (!d
->symver
&& strchr (d
->pattern
, '*') == NULL
)
3032 const char *verstr
, *name
;
3033 size_t namelen
, verlen
, newlen
;
3035 struct elf_link_hash_entry
*newh
;
3038 namelen
= strlen (name
);
3040 verlen
= strlen (verstr
);
3041 newlen
= namelen
+ verlen
+ 3;
3043 newname
= (char *) bfd_malloc ((bfd_size_type
) newlen
);
3044 if (newname
== NULL
)
3046 memcpy (newname
, name
, namelen
);
3048 /* Check the hidden versioned definition. */
3049 p
= newname
+ namelen
;
3051 memcpy (p
, verstr
, verlen
+ 1);
3052 newh
= elf_link_hash_lookup (elf_hash_table (info
),
3053 newname
, false, false,
3056 || (newh
->root
.type
!= bfd_link_hash_defined
3057 && newh
->root
.type
!= bfd_link_hash_defweak
))
3059 /* Check the default versioned definition. */
3061 memcpy (p
, verstr
, verlen
+ 1);
3062 newh
= elf_link_hash_lookup (elf_hash_table (info
),
3063 newname
, false, false,
3068 /* Mark this version if there is a definition. */
3070 && (newh
->root
.type
== bfd_link_hash_defined
3071 || newh
->root
.type
== bfd_link_hash_defweak
))
3075 /* Attach all the symbols to their version information. */
3076 asvinfo
.output_bfd
= output_bfd
;
3077 asvinfo
.info
= info
;
3078 asvinfo
.verdefs
= verdefs
;
3079 asvinfo
.failed
= false;
3081 elf_link_hash_traverse (elf_hash_table (info
),
3082 elf_link_assign_sym_version
,
3087 if (!info
->allow_undefined_version
)
3089 /* Check if all global versions have a definiton. */
3091 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3092 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3093 if (!d
->symver
&& !d
->script
3094 && strchr (d
->pattern
, '*') == NULL
)
3096 (*_bfd_error_handler
)
3097 (_("%s: undefined version: %s"),
3098 d
->pattern
, t
->name
);
3099 all_defined
= false;
3104 bfd_set_error (bfd_error_bad_value
);
3109 /* Find all symbols which were defined in a dynamic object and make
3110 the backend pick a reasonable value for them. */
3111 elf_link_hash_traverse (elf_hash_table (info
),
3112 elf_adjust_dynamic_symbol
,
3117 /* Add some entries to the .dynamic section. We fill in some of the
3118 values later, in elf_bfd_final_link, but we must add the entries
3119 now so that we know the final size of the .dynamic section. */
3121 /* If there are initialization and/or finalization functions to
3122 call then add the corresponding DT_INIT/DT_FINI entries. */
3123 h
= (info
->init_function
3124 ? elf_link_hash_lookup (elf_hash_table (info
),
3125 info
->init_function
, false,
3129 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3130 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3132 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT
, (bfd_vma
) 0))
3135 h
= (info
->fini_function
3136 ? elf_link_hash_lookup (elf_hash_table (info
),
3137 info
->fini_function
, false,
3141 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3142 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3144 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI
, (bfd_vma
) 0))
3148 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
3150 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3156 for (sub
= info
->input_bfds
; sub
!= NULL
;
3157 sub
= sub
->link_next
)
3158 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
3159 if (elf_section_data (o
)->this_hdr
.sh_type
3160 == SHT_PREINIT_ARRAY
)
3162 (*_bfd_error_handler
)
3163 (_("%s: .preinit_array section is not allowed in DSO"),
3164 bfd_archive_filename (sub
));
3168 bfd_set_error (bfd_error_nonrepresentable_section
);
3172 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAY
,
3174 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAYSZ
,
3178 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
3180 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAY
,
3182 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAYSZ
,
3186 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
3188 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAY
,
3190 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAYSZ
,
3195 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3196 /* If .dynstr is excluded from the link, we don't want any of
3197 these tags. Strictly, we should be checking each section
3198 individually; This quick check covers for the case where
3199 someone does a /DISCARD/ : { *(*) }. */
3200 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3202 bfd_size_type strsize
;
3204 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3205 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3206 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3207 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3208 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3209 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3210 (bfd_vma
) sizeof (Elf_External_Sym
)))
3215 /* The backend must work out the sizes of all the other dynamic
3217 if (bed
->elf_backend_size_dynamic_sections
3218 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3221 if (elf_hash_table (info
)->dynamic_sections_created
)
3223 bfd_size_type dynsymcount
;
3225 size_t bucketcount
= 0;
3226 size_t hash_entry_size
;
3227 unsigned int dtagcount
;
3229 /* Set up the version definition section. */
3230 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3231 BFD_ASSERT (s
!= NULL
);
3233 /* We may have created additional version definitions if we are
3234 just linking a regular application. */
3235 verdefs
= asvinfo
.verdefs
;
3237 /* Skip anonymous version tag. */
3238 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3239 verdefs
= verdefs
->next
;
3241 if (verdefs
== NULL
)
3242 _bfd_strip_section_from_output (info
, s
);
3247 struct bfd_elf_version_tree
*t
;
3249 Elf_Internal_Verdef def
;
3250 Elf_Internal_Verdaux defaux
;
3255 /* Make space for the base version. */
3256 size
+= sizeof (Elf_External_Verdef
);
3257 size
+= sizeof (Elf_External_Verdaux
);
3260 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3262 struct bfd_elf_version_deps
*n
;
3264 size
+= sizeof (Elf_External_Verdef
);
3265 size
+= sizeof (Elf_External_Verdaux
);
3268 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3269 size
+= sizeof (Elf_External_Verdaux
);
3272 s
->_raw_size
= size
;
3273 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3274 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3277 /* Fill in the version definition section. */
3281 def
.vd_version
= VER_DEF_CURRENT
;
3282 def
.vd_flags
= VER_FLG_BASE
;
3285 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3286 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3287 + sizeof (Elf_External_Verdaux
));
3289 if (soname_indx
!= (bfd_size_type
) -1)
3291 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3293 def
.vd_hash
= bfd_elf_hash (soname
);
3294 defaux
.vda_name
= soname_indx
;
3301 name
= basename (output_bfd
->filename
);
3302 def
.vd_hash
= bfd_elf_hash (name
);
3303 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3305 if (indx
== (bfd_size_type
) -1)
3307 defaux
.vda_name
= indx
;
3309 defaux
.vda_next
= 0;
3311 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3312 (Elf_External_Verdef
*) p
);
3313 p
+= sizeof (Elf_External_Verdef
);
3314 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3315 (Elf_External_Verdaux
*) p
);
3316 p
+= sizeof (Elf_External_Verdaux
);
3318 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3321 struct bfd_elf_version_deps
*n
;
3322 struct elf_link_hash_entry
*h
;
3325 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3328 /* Add a symbol representing this version. */
3330 if (! (_bfd_generic_link_add_one_symbol
3331 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3332 (bfd_vma
) 0, (const char *) NULL
, false,
3333 get_elf_backend_data (dynobj
)->collect
,
3334 (struct bfd_link_hash_entry
**) &h
)))
3336 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3337 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3338 h
->type
= STT_OBJECT
;
3339 h
->verinfo
.vertree
= t
;
3341 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3344 def
.vd_version
= VER_DEF_CURRENT
;
3346 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3347 def
.vd_flags
|= VER_FLG_WEAK
;
3348 def
.vd_ndx
= t
->vernum
+ 1;
3349 def
.vd_cnt
= cdeps
+ 1;
3350 def
.vd_hash
= bfd_elf_hash (t
->name
);
3351 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3352 if (t
->next
!= NULL
)
3353 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3354 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3358 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3359 (Elf_External_Verdef
*) p
);
3360 p
+= sizeof (Elf_External_Verdef
);
3362 defaux
.vda_name
= h
->dynstr_index
;
3363 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3365 if (t
->deps
== NULL
)
3366 defaux
.vda_next
= 0;
3368 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3369 t
->name_indx
= defaux
.vda_name
;
3371 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3372 (Elf_External_Verdaux
*) p
);
3373 p
+= sizeof (Elf_External_Verdaux
);
3375 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3377 if (n
->version_needed
== NULL
)
3379 /* This can happen if there was an error in the
3381 defaux
.vda_name
= 0;
3385 defaux
.vda_name
= n
->version_needed
->name_indx
;
3386 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3389 if (n
->next
== NULL
)
3390 defaux
.vda_next
= 0;
3392 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3394 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3395 (Elf_External_Verdaux
*) p
);
3396 p
+= sizeof (Elf_External_Verdaux
);
3400 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3401 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3405 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3408 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
3410 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3417 info
->flags_1
&= ~ (DF_1_INITFIRST
3420 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3425 /* Work out the size of the version reference section. */
3427 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3428 BFD_ASSERT (s
!= NULL
);
3430 struct elf_find_verdep_info sinfo
;
3432 sinfo
.output_bfd
= output_bfd
;
3434 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3435 if (sinfo
.vers
== 0)
3437 sinfo
.failed
= false;
3439 elf_link_hash_traverse (elf_hash_table (info
),
3440 elf_link_find_version_dependencies
,
3443 if (elf_tdata (output_bfd
)->verref
== NULL
)
3444 _bfd_strip_section_from_output (info
, s
);
3447 Elf_Internal_Verneed
*t
;
3452 /* Build the version definition section. */
3455 for (t
= elf_tdata (output_bfd
)->verref
;
3459 Elf_Internal_Vernaux
*a
;
3461 size
+= sizeof (Elf_External_Verneed
);
3463 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3464 size
+= sizeof (Elf_External_Vernaux
);
3467 s
->_raw_size
= size
;
3468 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3469 if (s
->contents
== NULL
)
3473 for (t
= elf_tdata (output_bfd
)->verref
;
3478 Elf_Internal_Vernaux
*a
;
3482 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3485 t
->vn_version
= VER_NEED_CURRENT
;
3487 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3488 elf_dt_name (t
->vn_bfd
) != NULL
3489 ? elf_dt_name (t
->vn_bfd
)
3490 : basename (t
->vn_bfd
->filename
),
3492 if (indx
== (bfd_size_type
) -1)
3495 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3496 if (t
->vn_nextref
== NULL
)
3499 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3500 + caux
* sizeof (Elf_External_Vernaux
));
3502 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3503 (Elf_External_Verneed
*) p
);
3504 p
+= sizeof (Elf_External_Verneed
);
3506 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3508 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3509 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3510 a
->vna_nodename
, false);
3511 if (indx
== (bfd_size_type
) -1)
3514 if (a
->vna_nextptr
== NULL
)
3517 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3519 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3520 (Elf_External_Vernaux
*) p
);
3521 p
+= sizeof (Elf_External_Vernaux
);
3525 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3527 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3531 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3535 /* Assign dynsym indicies. In a shared library we generate a
3536 section symbol for each output section, which come first.
3537 Next come all of the back-end allocated local dynamic syms,
3538 followed by the rest of the global symbols. */
3540 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3542 /* Work out the size of the symbol version section. */
3543 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3544 BFD_ASSERT (s
!= NULL
);
3545 if (dynsymcount
== 0
3546 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3548 _bfd_strip_section_from_output (info
, s
);
3549 /* The DYNSYMCOUNT might have changed if we were going to
3550 output a dynamic symbol table entry for S. */
3551 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3555 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3556 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3557 if (s
->contents
== NULL
)
3560 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3564 /* Set the size of the .dynsym and .hash sections. We counted
3565 the number of dynamic symbols in elf_link_add_object_symbols.
3566 We will build the contents of .dynsym and .hash when we build
3567 the final symbol table, because until then we do not know the
3568 correct value to give the symbols. We built the .dynstr
3569 section as we went along in elf_link_add_object_symbols. */
3570 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3571 BFD_ASSERT (s
!= NULL
);
3572 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3573 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3574 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3577 if (dynsymcount
!= 0)
3579 Elf_Internal_Sym isym
;
3581 /* The first entry in .dynsym is a dummy symbol. */
3588 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3591 /* Compute the size of the hashing table. As a side effect this
3592 computes the hash values for all the names we export. */
3593 bucketcount
= compute_bucket_count (info
);
3595 s
= bfd_get_section_by_name (dynobj
, ".hash");
3596 BFD_ASSERT (s
!= NULL
);
3597 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3598 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3599 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3600 if (s
->contents
== NULL
)
3603 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3605 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3606 s
->contents
+ hash_entry_size
);
3608 elf_hash_table (info
)->bucketcount
= bucketcount
;
3610 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3611 BFD_ASSERT (s
!= NULL
);
3613 elf_finalize_dynstr (output_bfd
, info
);
3615 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3617 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3618 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3625 /* This function is used to adjust offsets into .dynstr for
3626 dynamic symbols. This is called via elf_link_hash_traverse. */
3628 static boolean elf_adjust_dynstr_offsets
3629 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3632 elf_adjust_dynstr_offsets (h
, data
)
3633 struct elf_link_hash_entry
*h
;
3636 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3638 if (h
->root
.type
== bfd_link_hash_warning
)
3639 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3641 if (h
->dynindx
!= -1)
3642 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3646 /* Assign string offsets in .dynstr, update all structures referencing
3650 elf_finalize_dynstr (output_bfd
, info
)
3652 struct bfd_link_info
*info
;
3654 struct elf_link_local_dynamic_entry
*entry
;
3655 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3656 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3659 Elf_External_Dyn
*dyncon
, *dynconend
;
3661 _bfd_elf_strtab_finalize (dynstr
);
3662 size
= _bfd_elf_strtab_size (dynstr
);
3664 /* Update all .dynamic entries referencing .dynstr strings. */
3665 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3666 BFD_ASSERT (sdyn
!= NULL
);
3668 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3669 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3671 for (; dyncon
< dynconend
; dyncon
++)
3673 Elf_Internal_Dyn dyn
;
3675 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3679 dyn
.d_un
.d_val
= size
;
3680 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3688 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3689 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3696 /* Now update local dynamic symbols. */
3697 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3698 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3699 entry
->isym
.st_name
);
3701 /* And the rest of dynamic symbols. */
3702 elf_link_hash_traverse (elf_hash_table (info
),
3703 elf_adjust_dynstr_offsets
, dynstr
);
3705 /* Adjust version definitions. */
3706 if (elf_tdata (output_bfd
)->cverdefs
)
3711 Elf_Internal_Verdef def
;
3712 Elf_Internal_Verdaux defaux
;
3714 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3715 p
= (bfd_byte
*) s
->contents
;
3718 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3720 p
+= sizeof (Elf_External_Verdef
);
3721 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3723 _bfd_elf_swap_verdaux_in (output_bfd
,
3724 (Elf_External_Verdaux
*) p
, &defaux
);
3725 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3727 _bfd_elf_swap_verdaux_out (output_bfd
,
3728 &defaux
, (Elf_External_Verdaux
*) p
);
3729 p
+= sizeof (Elf_External_Verdaux
);
3732 while (def
.vd_next
);
3735 /* Adjust version references. */
3736 if (elf_tdata (output_bfd
)->verref
)
3741 Elf_Internal_Verneed need
;
3742 Elf_Internal_Vernaux needaux
;
3744 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3745 p
= (bfd_byte
*) s
->contents
;
3748 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3750 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3751 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3752 (Elf_External_Verneed
*) p
);
3753 p
+= sizeof (Elf_External_Verneed
);
3754 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3756 _bfd_elf_swap_vernaux_in (output_bfd
,
3757 (Elf_External_Vernaux
*) p
, &needaux
);
3758 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3760 _bfd_elf_swap_vernaux_out (output_bfd
,
3762 (Elf_External_Vernaux
*) p
);
3763 p
+= sizeof (Elf_External_Vernaux
);
3766 while (need
.vn_next
);
3772 /* Fix up the flags for a symbol. This handles various cases which
3773 can only be fixed after all the input files are seen. This is
3774 currently called by both adjust_dynamic_symbol and
3775 assign_sym_version, which is unnecessary but perhaps more robust in
3776 the face of future changes. */
3779 elf_fix_symbol_flags (h
, eif
)
3780 struct elf_link_hash_entry
*h
;
3781 struct elf_info_failed
*eif
;
3783 /* If this symbol was mentioned in a non-ELF file, try to set
3784 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3785 permit a non-ELF file to correctly refer to a symbol defined in
3786 an ELF dynamic object. */
3787 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3789 while (h
->root
.type
== bfd_link_hash_indirect
)
3790 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3792 if (h
->root
.type
!= bfd_link_hash_defined
3793 && h
->root
.type
!= bfd_link_hash_defweak
)
3794 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3795 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3798 if (h
->root
.u
.def
.section
->owner
!= NULL
3799 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3800 == bfd_target_elf_flavour
))
3801 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3802 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3804 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3807 if (h
->dynindx
== -1
3808 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3809 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3811 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3820 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3821 was first seen in a non-ELF file. Fortunately, if the symbol
3822 was first seen in an ELF file, we're probably OK unless the
3823 symbol was defined in a non-ELF file. Catch that case here.
3824 FIXME: We're still in trouble if the symbol was first seen in
3825 a dynamic object, and then later in a non-ELF regular object. */
3826 if ((h
->root
.type
== bfd_link_hash_defined
3827 || h
->root
.type
== bfd_link_hash_defweak
)
3828 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3829 && (h
->root
.u
.def
.section
->owner
!= NULL
3830 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3831 != bfd_target_elf_flavour
)
3832 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3833 && (h
->elf_link_hash_flags
3834 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3835 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3838 /* If this is a final link, and the symbol was defined as a common
3839 symbol in a regular object file, and there was no definition in
3840 any dynamic object, then the linker will have allocated space for
3841 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3842 flag will not have been set. */
3843 if (h
->root
.type
== bfd_link_hash_defined
3844 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3845 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3846 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3847 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3848 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3850 /* If -Bsymbolic was used (which means to bind references to global
3851 symbols to the definition within the shared object), and this
3852 symbol was defined in a regular object, then it actually doesn't
3853 need a PLT entry, and we can accomplish that by forcing it local.
3854 Likewise, if the symbol has hidden or internal visibility.
3855 FIXME: It might be that we also do not need a PLT for other
3856 non-hidden visibilities, but we would have to tell that to the
3857 backend specifically; we can't just clear PLT-related data here. */
3858 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3859 && eif
->info
->shared
3860 && is_elf_hash_table (eif
->info
)
3861 && (eif
->info
->symbolic
3862 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3863 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3864 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3866 struct elf_backend_data
*bed
;
3867 boolean force_local
;
3869 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3871 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3872 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3873 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3876 /* If this is a weak defined symbol in a dynamic object, and we know
3877 the real definition in the dynamic object, copy interesting flags
3878 over to the real definition. */
3879 if (h
->weakdef
!= NULL
)
3881 struct elf_link_hash_entry
*weakdef
;
3883 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3884 || h
->root
.type
== bfd_link_hash_defweak
);
3885 weakdef
= h
->weakdef
;
3886 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3887 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3888 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3890 /* If the real definition is defined by a regular object file,
3891 don't do anything special. See the longer description in
3892 elf_adjust_dynamic_symbol, below. */
3893 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3897 struct elf_backend_data
*bed
;
3899 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3900 (*bed
->elf_backend_copy_indirect_symbol
) (weakdef
, h
);
3907 /* Make the backend pick a good value for a dynamic symbol. This is
3908 called via elf_link_hash_traverse, and also calls itself
3912 elf_adjust_dynamic_symbol (h
, data
)
3913 struct elf_link_hash_entry
*h
;
3916 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3918 struct elf_backend_data
*bed
;
3920 if (h
->root
.type
== bfd_link_hash_warning
)
3922 h
->plt
.offset
= (bfd_vma
) -1;
3923 h
->got
.offset
= (bfd_vma
) -1;
3925 /* When warning symbols are created, they **replace** the "real"
3926 entry in the hash table, thus we never get to see the real
3927 symbol in a hash traversal. So look at it now. */
3928 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3931 /* Ignore indirect symbols. These are added by the versioning code. */
3932 if (h
->root
.type
== bfd_link_hash_indirect
)
3935 if (! is_elf_hash_table (eif
->info
))
3938 /* Fix the symbol flags. */
3939 if (! elf_fix_symbol_flags (h
, eif
))
3942 /* If this symbol does not require a PLT entry, and it is not
3943 defined by a dynamic object, or is not referenced by a regular
3944 object, ignore it. We do have to handle a weak defined symbol,
3945 even if no regular object refers to it, if we decided to add it
3946 to the dynamic symbol table. FIXME: Do we normally need to worry
3947 about symbols which are defined by one dynamic object and
3948 referenced by another one? */
3949 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3950 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3951 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3952 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3953 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3955 h
->plt
.offset
= (bfd_vma
) -1;
3959 /* If we've already adjusted this symbol, don't do it again. This
3960 can happen via a recursive call. */
3961 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3964 /* Don't look at this symbol again. Note that we must set this
3965 after checking the above conditions, because we may look at a
3966 symbol once, decide not to do anything, and then get called
3967 recursively later after REF_REGULAR is set below. */
3968 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3970 /* If this is a weak definition, and we know a real definition, and
3971 the real symbol is not itself defined by a regular object file,
3972 then get a good value for the real definition. We handle the
3973 real symbol first, for the convenience of the backend routine.
3975 Note that there is a confusing case here. If the real definition
3976 is defined by a regular object file, we don't get the real symbol
3977 from the dynamic object, but we do get the weak symbol. If the
3978 processor backend uses a COPY reloc, then if some routine in the
3979 dynamic object changes the real symbol, we will not see that
3980 change in the corresponding weak symbol. This is the way other
3981 ELF linkers work as well, and seems to be a result of the shared
3984 I will clarify this issue. Most SVR4 shared libraries define the
3985 variable _timezone and define timezone as a weak synonym. The
3986 tzset call changes _timezone. If you write
3987 extern int timezone;
3989 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3990 you might expect that, since timezone is a synonym for _timezone,
3991 the same number will print both times. However, if the processor
3992 backend uses a COPY reloc, then actually timezone will be copied
3993 into your process image, and, since you define _timezone
3994 yourself, _timezone will not. Thus timezone and _timezone will
3995 wind up at different memory locations. The tzset call will set
3996 _timezone, leaving timezone unchanged. */
3998 if (h
->weakdef
!= NULL
)
4000 /* If we get to this point, we know there is an implicit
4001 reference by a regular object file via the weak symbol H.
4002 FIXME: Is this really true? What if the traversal finds
4003 H->WEAKDEF before it finds H? */
4004 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4006 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4010 /* If a symbol has no type and no size and does not require a PLT
4011 entry, then we are probably about to do the wrong thing here: we
4012 are probably going to create a COPY reloc for an empty object.
4013 This case can arise when a shared object is built with assembly
4014 code, and the assembly code fails to set the symbol type. */
4016 && h
->type
== STT_NOTYPE
4017 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4018 (*_bfd_error_handler
)
4019 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4020 h
->root
.root
.string
);
4022 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4023 bed
= get_elf_backend_data (dynobj
);
4024 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4033 /* This routine is used to export all defined symbols into the dynamic
4034 symbol table. It is called via elf_link_hash_traverse. */
4037 elf_export_symbol (h
, data
)
4038 struct elf_link_hash_entry
*h
;
4041 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4043 /* Ignore indirect symbols. These are added by the versioning code. */
4044 if (h
->root
.type
== bfd_link_hash_indirect
)
4047 if (h
->root
.type
== bfd_link_hash_warning
)
4048 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4050 if (h
->dynindx
== -1
4051 && (h
->elf_link_hash_flags
4052 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4054 struct bfd_elf_version_tree
*t
;
4055 struct bfd_elf_version_expr
*d
;
4057 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4059 if (t
->globals
!= NULL
)
4061 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4063 if ((*d
->match
) (d
, h
->root
.root
.string
))
4068 if (t
->locals
!= NULL
)
4070 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4072 if ((*d
->match
) (d
, h
->root
.root
.string
))
4081 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4092 /* Look through the symbols which are defined in other shared
4093 libraries and referenced here. Update the list of version
4094 dependencies. This will be put into the .gnu.version_r section.
4095 This function is called via elf_link_hash_traverse. */
4098 elf_link_find_version_dependencies (h
, data
)
4099 struct elf_link_hash_entry
*h
;
4102 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4103 Elf_Internal_Verneed
*t
;
4104 Elf_Internal_Vernaux
*a
;
4107 if (h
->root
.type
== bfd_link_hash_warning
)
4108 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4110 /* We only care about symbols defined in shared objects with version
4112 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4113 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4115 || h
->verinfo
.verdef
== NULL
)
4118 /* See if we already know about this version. */
4119 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4121 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4124 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4125 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4131 /* This is a new version. Add it to tree we are building. */
4136 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4139 rinfo
->failed
= true;
4143 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4144 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4145 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4149 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4151 /* Note that we are copying a string pointer here, and testing it
4152 above. If bfd_elf_string_from_elf_section is ever changed to
4153 discard the string data when low in memory, this will have to be
4155 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4157 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4158 a
->vna_nextptr
= t
->vn_auxptr
;
4160 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4163 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4170 /* Figure out appropriate versions for all the symbols. We may not
4171 have the version number script until we have read all of the input
4172 files, so until that point we don't know which symbols should be
4173 local. This function is called via elf_link_hash_traverse. */
4176 elf_link_assign_sym_version (h
, data
)
4177 struct elf_link_hash_entry
*h
;
4180 struct elf_assign_sym_version_info
*sinfo
;
4181 struct bfd_link_info
*info
;
4182 struct elf_backend_data
*bed
;
4183 struct elf_info_failed eif
;
4187 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4190 if (h
->root
.type
== bfd_link_hash_warning
)
4191 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4193 /* Fix the symbol flags. */
4196 if (! elf_fix_symbol_flags (h
, &eif
))
4199 sinfo
->failed
= true;
4203 /* We only need version numbers for symbols defined in regular
4205 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4208 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4209 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4210 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4212 struct bfd_elf_version_tree
*t
;
4217 /* There are two consecutive ELF_VER_CHR characters if this is
4218 not a hidden symbol. */
4220 if (*p
== ELF_VER_CHR
)
4226 /* If there is no version string, we can just return out. */
4230 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4234 /* Look for the version. If we find it, it is no longer weak. */
4235 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4237 if (strcmp (t
->name
, p
) == 0)
4241 struct bfd_elf_version_expr
*d
;
4243 len
= p
- h
->root
.root
.string
;
4244 alc
= bfd_malloc ((bfd_size_type
) len
);
4247 memcpy (alc
, h
->root
.root
.string
, len
- 1);
4248 alc
[len
- 1] = '\0';
4249 if (alc
[len
- 2] == ELF_VER_CHR
)
4250 alc
[len
- 2] = '\0';
4252 h
->verinfo
.vertree
= t
;
4256 if (t
->globals
!= NULL
)
4258 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4259 if ((*d
->match
) (d
, alc
))
4263 /* See if there is anything to force this symbol to
4265 if (d
== NULL
&& t
->locals
!= NULL
)
4267 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4269 if ((*d
->match
) (d
, alc
))
4271 if (h
->dynindx
!= -1
4273 && ! info
->export_dynamic
)
4275 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4288 /* If we are building an application, we need to create a
4289 version node for this version. */
4290 if (t
== NULL
&& ! info
->shared
)
4292 struct bfd_elf_version_tree
**pp
;
4295 /* If we aren't going to export this symbol, we don't need
4296 to worry about it. */
4297 if (h
->dynindx
== -1)
4301 t
= ((struct bfd_elf_version_tree
*)
4302 bfd_alloc (sinfo
->output_bfd
, amt
));
4305 sinfo
->failed
= true;
4314 t
->name_indx
= (unsigned int) -1;
4318 /* Don't count anonymous version tag. */
4319 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4321 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4323 t
->vernum
= version_index
;
4327 h
->verinfo
.vertree
= t
;
4331 /* We could not find the version for a symbol when
4332 generating a shared archive. Return an error. */
4333 (*_bfd_error_handler
)
4334 (_("%s: undefined versioned symbol name %s"),
4335 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4336 bfd_set_error (bfd_error_bad_value
);
4337 sinfo
->failed
= true;
4342 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4345 /* If we don't have a version for this symbol, see if we can find
4347 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4349 struct bfd_elf_version_tree
*t
;
4350 struct bfd_elf_version_tree
*local_ver
;
4351 struct bfd_elf_version_expr
*d
;
4353 /* See if can find what version this symbol is in. If the
4354 symbol is supposed to be local, then don't actually register
4357 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4359 if (t
->globals
!= NULL
)
4364 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4366 if ((*d
->match
) (d
, h
->root
.root
.string
))
4372 /* There is a version without definition. Make
4373 the symbol the default definition for this
4375 h
->verinfo
.vertree
= t
;
4386 /* There is no undefined version for this symbol. Hide the
4388 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4391 if (t
->locals
!= NULL
)
4393 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4395 /* If the match is "*", keep looking for a more
4396 explicit, perhaps even global, match. */
4397 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4399 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4411 if (local_ver
!= NULL
)
4413 h
->verinfo
.vertree
= local_ver
;
4414 if (h
->dynindx
!= -1
4416 && ! info
->export_dynamic
)
4418 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4426 /* Final phase of ELF linker. */
4428 /* A structure we use to avoid passing large numbers of arguments. */
4430 struct elf_final_link_info
4432 /* General link information. */
4433 struct bfd_link_info
*info
;
4436 /* Symbol string table. */
4437 struct bfd_strtab_hash
*symstrtab
;
4438 /* .dynsym section. */
4439 asection
*dynsym_sec
;
4440 /* .hash section. */
4442 /* symbol version section (.gnu.version). */
4443 asection
*symver_sec
;
4444 /* first SHF_TLS section (if any). */
4445 asection
*first_tls_sec
;
4446 /* Buffer large enough to hold contents of any section. */
4448 /* Buffer large enough to hold external relocs of any section. */
4449 PTR external_relocs
;
4450 /* Buffer large enough to hold internal relocs of any section. */
4451 Elf_Internal_Rela
*internal_relocs
;
4452 /* Buffer large enough to hold external local symbols of any input
4454 Elf_External_Sym
*external_syms
;
4455 /* And a buffer for symbol section indices. */
4456 Elf_External_Sym_Shndx
*locsym_shndx
;
4457 /* Buffer large enough to hold internal local symbols of any input
4459 Elf_Internal_Sym
*internal_syms
;
4460 /* Array large enough to hold a symbol index for each local symbol
4461 of any input BFD. */
4463 /* Array large enough to hold a section pointer for each local
4464 symbol of any input BFD. */
4465 asection
**sections
;
4466 /* Buffer to hold swapped out symbols. */
4467 Elf_External_Sym
*symbuf
;
4468 /* And one for symbol section indices. */
4469 Elf_External_Sym_Shndx
*symshndxbuf
;
4470 /* Number of swapped out symbols in buffer. */
4471 size_t symbuf_count
;
4472 /* Number of symbols which fit in symbuf. */
4476 static boolean elf_link_output_sym
4477 PARAMS ((struct elf_final_link_info
*, const char *,
4478 Elf_Internal_Sym
*, asection
*));
4479 static boolean elf_link_flush_output_syms
4480 PARAMS ((struct elf_final_link_info
*));
4481 static boolean elf_link_output_extsym
4482 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4483 static boolean elf_link_sec_merge_syms
4484 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4485 static boolean elf_link_check_versioned_symbol
4486 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
4487 static boolean elf_link_input_bfd
4488 PARAMS ((struct elf_final_link_info
*, bfd
*));
4489 static boolean elf_reloc_link_order
4490 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4491 struct bfd_link_order
*));
4493 /* This struct is used to pass information to elf_link_output_extsym. */
4495 struct elf_outext_info
4499 struct elf_final_link_info
*finfo
;
4502 /* Compute the size of, and allocate space for, REL_HDR which is the
4503 section header for a section containing relocations for O. */
4506 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4508 Elf_Internal_Shdr
*rel_hdr
;
4511 bfd_size_type reloc_count
;
4512 bfd_size_type num_rel_hashes
;
4514 /* Figure out how many relocations there will be. */
4515 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4516 reloc_count
= elf_section_data (o
)->rel_count
;
4518 reloc_count
= elf_section_data (o
)->rel_count2
;
4520 num_rel_hashes
= o
->reloc_count
;
4521 if (num_rel_hashes
< reloc_count
)
4522 num_rel_hashes
= reloc_count
;
4524 /* That allows us to calculate the size of the section. */
4525 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4527 /* The contents field must last into write_object_contents, so we
4528 allocate it with bfd_alloc rather than malloc. Also since we
4529 cannot be sure that the contents will actually be filled in,
4530 we zero the allocated space. */
4531 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4532 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4535 /* We only allocate one set of hash entries, so we only do it the
4536 first time we are called. */
4537 if (elf_section_data (o
)->rel_hashes
== NULL
4540 struct elf_link_hash_entry
**p
;
4542 p
= ((struct elf_link_hash_entry
**)
4543 bfd_zmalloc (num_rel_hashes
4544 * sizeof (struct elf_link_hash_entry
*)));
4548 elf_section_data (o
)->rel_hashes
= p
;
4554 /* When performing a relocateable link, the input relocations are
4555 preserved. But, if they reference global symbols, the indices
4556 referenced must be updated. Update all the relocations in
4557 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4560 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4562 Elf_Internal_Shdr
*rel_hdr
;
4564 struct elf_link_hash_entry
**rel_hash
;
4567 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4568 Elf_Internal_Rel
*irel
;
4569 Elf_Internal_Rela
*irela
;
4570 bfd_size_type amt
= sizeof (Elf_Internal_Rel
) * bed
->s
->int_rels_per_ext_rel
;
4572 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
4575 (*_bfd_error_handler
) (_("Error: out of memory"));
4579 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
4580 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
4583 (*_bfd_error_handler
) (_("Error: out of memory"));
4587 for (i
= 0; i
< count
; i
++, rel_hash
++)
4589 if (*rel_hash
== NULL
)
4592 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4594 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4596 Elf_External_Rel
*erel
;
4599 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4600 if (bed
->s
->swap_reloc_in
)
4601 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
4603 elf_swap_reloc_in (abfd
, erel
, irel
);
4605 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4606 irel
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4607 ELF_R_TYPE (irel
[j
].r_info
));
4609 if (bed
->s
->swap_reloc_out
)
4610 (*bed
->s
->swap_reloc_out
) (abfd
, irel
, (bfd_byte
*) erel
);
4612 elf_swap_reloc_out (abfd
, irel
, erel
);
4616 Elf_External_Rela
*erela
;
4619 BFD_ASSERT (rel_hdr
->sh_entsize
4620 == sizeof (Elf_External_Rela
));
4622 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4623 if (bed
->s
->swap_reloca_in
)
4624 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
4626 elf_swap_reloca_in (abfd
, erela
, irela
);
4628 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4629 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4630 ELF_R_TYPE (irela
[j
].r_info
));
4632 if (bed
->s
->swap_reloca_out
)
4633 (*bed
->s
->swap_reloca_out
) (abfd
, irela
, (bfd_byte
*) erela
);
4635 elf_swap_reloca_out (abfd
, irela
, erela
);
4643 struct elf_link_sort_rela
4646 enum elf_reloc_type_class type
;
4649 Elf_Internal_Rel rel
;
4650 Elf_Internal_Rela rela
;
4655 elf_link_sort_cmp1 (A
, B
)
4659 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4660 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4661 int relativea
, relativeb
;
4663 relativea
= a
->type
== reloc_class_relative
;
4664 relativeb
= b
->type
== reloc_class_relative
;
4666 if (relativea
< relativeb
)
4668 if (relativea
> relativeb
)
4670 if (ELF_R_SYM (a
->u
.rel
.r_info
) < ELF_R_SYM (b
->u
.rel
.r_info
))
4672 if (ELF_R_SYM (a
->u
.rel
.r_info
) > ELF_R_SYM (b
->u
.rel
.r_info
))
4674 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4676 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4682 elf_link_sort_cmp2 (A
, B
)
4686 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4687 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4690 if (a
->offset
< b
->offset
)
4692 if (a
->offset
> b
->offset
)
4694 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4695 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4700 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4702 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4708 elf_link_sort_relocs (abfd
, info
, psec
)
4710 struct bfd_link_info
*info
;
4713 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4714 asection
*reldyn
, *o
;
4715 boolean rel
= false;
4716 bfd_size_type count
, size
;
4718 struct elf_link_sort_rela
*rela
;
4719 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4721 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4722 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4724 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4725 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4728 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rel
);
4731 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rela
);
4734 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4735 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4736 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4737 && o
->output_section
== reldyn
)
4738 size
+= o
->_raw_size
;
4740 if (size
!= reldyn
->_raw_size
)
4743 rela
= (struct elf_link_sort_rela
*) bfd_zmalloc (sizeof (*rela
) * count
);
4746 (*info
->callbacks
->warning
)
4747 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4752 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4753 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4754 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4755 && o
->output_section
== reldyn
)
4759 Elf_External_Rel
*erel
, *erelend
;
4760 struct elf_link_sort_rela
*s
;
4762 erel
= (Elf_External_Rel
*) o
->contents
;
4763 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4764 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4765 for (; erel
< erelend
; erel
++, s
++)
4767 if (bed
->s
->swap_reloc_in
)
4768 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &s
->u
.rel
);
4770 elf_swap_reloc_in (abfd
, erel
, &s
->u
.rel
);
4772 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4777 Elf_External_Rela
*erela
, *erelaend
;
4778 struct elf_link_sort_rela
*s
;
4780 erela
= (Elf_External_Rela
*) o
->contents
;
4781 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4782 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4783 for (; erela
< erelaend
; erela
++, s
++)
4785 if (bed
->s
->swap_reloca_in
)
4786 (*bed
->s
->swap_reloca_in
) (dynobj
, (bfd_byte
*) erela
,
4789 elf_swap_reloca_in (dynobj
, erela
, &s
->u
.rela
);
4791 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4796 qsort (rela
, (size_t) count
, sizeof (*rela
), elf_link_sort_cmp1
);
4797 for (ret
= 0; ret
< count
&& rela
[ret
].type
== reloc_class_relative
; ret
++)
4799 for (i
= ret
, j
= ret
; i
< count
; i
++)
4801 if (ELF_R_SYM (rela
[i
].u
.rel
.r_info
) != ELF_R_SYM (rela
[j
].u
.rel
.r_info
))
4803 rela
[i
].offset
= rela
[j
].u
.rel
.r_offset
;
4805 qsort (rela
+ ret
, (size_t) count
- ret
, sizeof (*rela
), elf_link_sort_cmp2
);
4807 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4808 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4809 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4810 && o
->output_section
== reldyn
)
4814 Elf_External_Rel
*erel
, *erelend
;
4815 struct elf_link_sort_rela
*s
;
4817 erel
= (Elf_External_Rel
*) o
->contents
;
4818 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4819 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4820 for (; erel
< erelend
; erel
++, s
++)
4822 if (bed
->s
->swap_reloc_out
)
4823 (*bed
->s
->swap_reloc_out
) (abfd
, &s
->u
.rel
,
4826 elf_swap_reloc_out (abfd
, &s
->u
.rel
, erel
);
4831 Elf_External_Rela
*erela
, *erelaend
;
4832 struct elf_link_sort_rela
*s
;
4834 erela
= (Elf_External_Rela
*) o
->contents
;
4835 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4836 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4837 for (; erela
< erelaend
; erela
++, s
++)
4839 if (bed
->s
->swap_reloca_out
)
4840 (*bed
->s
->swap_reloca_out
) (dynobj
, &s
->u
.rela
,
4841 (bfd_byte
*) erela
);
4843 elf_swap_reloca_out (dynobj
, &s
->u
.rela
, erela
);
4853 /* Do the final step of an ELF link. */
4856 elf_bfd_final_link (abfd
, info
)
4858 struct bfd_link_info
*info
;
4861 boolean emit_relocs
;
4863 struct elf_final_link_info finfo
;
4864 register asection
*o
;
4865 register struct bfd_link_order
*p
;
4867 bfd_size_type max_contents_size
;
4868 bfd_size_type max_external_reloc_size
;
4869 bfd_size_type max_internal_reloc_count
;
4870 bfd_size_type max_sym_count
;
4871 bfd_size_type max_sym_shndx_count
;
4873 Elf_Internal_Sym elfsym
;
4875 Elf_Internal_Shdr
*symtab_hdr
;
4876 Elf_Internal_Shdr
*symstrtab_hdr
;
4877 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4878 struct elf_outext_info eoinfo
;
4880 size_t relativecount
= 0;
4881 asection
*reldyn
= 0;
4884 if (! is_elf_hash_table (info
))
4888 abfd
->flags
|= DYNAMIC
;
4890 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4891 dynobj
= elf_hash_table (info
)->dynobj
;
4893 emit_relocs
= (info
->relocateable
4894 || info
->emitrelocations
4895 || bed
->elf_backend_emit_relocs
);
4898 finfo
.output_bfd
= abfd
;
4899 finfo
.symstrtab
= elf_stringtab_init ();
4900 if (finfo
.symstrtab
== NULL
)
4905 finfo
.dynsym_sec
= NULL
;
4906 finfo
.hash_sec
= NULL
;
4907 finfo
.symver_sec
= NULL
;
4911 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4912 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4913 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4914 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4915 /* Note that it is OK if symver_sec is NULL. */
4918 finfo
.contents
= NULL
;
4919 finfo
.external_relocs
= NULL
;
4920 finfo
.internal_relocs
= NULL
;
4921 finfo
.external_syms
= NULL
;
4922 finfo
.locsym_shndx
= NULL
;
4923 finfo
.internal_syms
= NULL
;
4924 finfo
.indices
= NULL
;
4925 finfo
.sections
= NULL
;
4926 finfo
.symbuf
= NULL
;
4927 finfo
.symshndxbuf
= NULL
;
4928 finfo
.symbuf_count
= 0;
4929 finfo
.first_tls_sec
= NULL
;
4930 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4931 if ((o
->flags
& SEC_THREAD_LOCAL
) != 0
4932 && (o
->flags
& SEC_LOAD
) != 0)
4934 finfo
.first_tls_sec
= o
;
4938 /* Count up the number of relocations we will output for each output
4939 section, so that we know the sizes of the reloc sections. We
4940 also figure out some maximum sizes. */
4941 max_contents_size
= 0;
4942 max_external_reloc_size
= 0;
4943 max_internal_reloc_count
= 0;
4945 max_sym_shndx_count
= 0;
4947 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4951 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4953 if (p
->type
== bfd_section_reloc_link_order
4954 || p
->type
== bfd_symbol_reloc_link_order
)
4956 else if (p
->type
== bfd_indirect_link_order
)
4960 sec
= p
->u
.indirect
.section
;
4962 /* Mark all sections which are to be included in the
4963 link. This will normally be every section. We need
4964 to do this so that we can identify any sections which
4965 the linker has decided to not include. */
4966 sec
->linker_mark
= true;
4968 if (sec
->flags
& SEC_MERGE
)
4971 if (info
->relocateable
|| info
->emitrelocations
)
4972 o
->reloc_count
+= sec
->reloc_count
;
4973 else if (bed
->elf_backend_count_relocs
)
4975 Elf_Internal_Rela
* relocs
;
4977 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4978 (abfd
, sec
, (PTR
) NULL
,
4979 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
4982 += (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
4984 if (elf_section_data (o
)->relocs
!= relocs
)
4988 if (sec
->_raw_size
> max_contents_size
)
4989 max_contents_size
= sec
->_raw_size
;
4990 if (sec
->_cooked_size
> max_contents_size
)
4991 max_contents_size
= sec
->_cooked_size
;
4993 /* We are interested in just local symbols, not all
4995 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4996 && (sec
->owner
->flags
& DYNAMIC
) == 0)
5000 if (elf_bad_symtab (sec
->owner
))
5001 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
5002 / sizeof (Elf_External_Sym
));
5004 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
5006 if (sym_count
> max_sym_count
)
5007 max_sym_count
= sym_count
;
5009 if (sym_count
> max_sym_shndx_count
5010 && elf_symtab_shndx (sec
->owner
) != 0)
5011 max_sym_shndx_count
= sym_count
;
5013 if ((sec
->flags
& SEC_RELOC
) != 0)
5017 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
5018 if (ext_size
> max_external_reloc_size
)
5019 max_external_reloc_size
= ext_size
;
5020 if (sec
->reloc_count
> max_internal_reloc_count
)
5021 max_internal_reloc_count
= sec
->reloc_count
;
5027 if (o
->reloc_count
> 0)
5028 o
->flags
|= SEC_RELOC
;
5031 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5032 set it (this is probably a bug) and if it is set
5033 assign_section_numbers will create a reloc section. */
5034 o
->flags
&=~ SEC_RELOC
;
5037 /* If the SEC_ALLOC flag is not set, force the section VMA to
5038 zero. This is done in elf_fake_sections as well, but forcing
5039 the VMA to 0 here will ensure that relocs against these
5040 sections are handled correctly. */
5041 if ((o
->flags
& SEC_ALLOC
) == 0
5042 && ! o
->user_set_vma
)
5046 if (! info
->relocateable
&& merged
)
5047 elf_link_hash_traverse (elf_hash_table (info
),
5048 elf_link_sec_merge_syms
, (PTR
) abfd
);
5050 /* Figure out the file positions for everything but the symbol table
5051 and the relocs. We set symcount to force assign_section_numbers
5052 to create a symbol table. */
5053 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5054 BFD_ASSERT (! abfd
->output_has_begun
);
5055 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5058 /* Figure out how many relocations we will have in each section.
5059 Just using RELOC_COUNT isn't good enough since that doesn't
5060 maintain a separate value for REL vs. RELA relocations. */
5062 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5063 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5065 asection
*output_section
;
5067 if (! o
->linker_mark
)
5069 /* This section was omitted from the link. */
5073 output_section
= o
->output_section
;
5075 if (output_section
!= NULL
5076 && (o
->flags
& SEC_RELOC
) != 0)
5078 struct bfd_elf_section_data
*esdi
5079 = elf_section_data (o
);
5080 struct bfd_elf_section_data
*esdo
5081 = elf_section_data (output_section
);
5082 unsigned int *rel_count
;
5083 unsigned int *rel_count2
;
5084 bfd_size_type entsize
;
5085 bfd_size_type entsize2
;
5087 /* We must be careful to add the relocations from the
5088 input section to the right output count. */
5089 entsize
= esdi
->rel_hdr
.sh_entsize
;
5090 entsize2
= esdi
->rel_hdr2
? esdi
->rel_hdr2
->sh_entsize
: 0;
5091 BFD_ASSERT ((entsize
== sizeof (Elf_External_Rel
)
5092 || entsize
== sizeof (Elf_External_Rela
))
5093 && entsize2
!= entsize
5095 || entsize2
== sizeof (Elf_External_Rel
)
5096 || entsize2
== sizeof (Elf_External_Rela
)));
5097 if (entsize
== esdo
->rel_hdr
.sh_entsize
)
5099 rel_count
= &esdo
->rel_count
;
5100 rel_count2
= &esdo
->rel_count2
;
5104 rel_count
= &esdo
->rel_count2
;
5105 rel_count2
= &esdo
->rel_count
;
5108 *rel_count
+= NUM_SHDR_ENTRIES (& esdi
->rel_hdr
);
5110 *rel_count2
+= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5111 output_section
->flags
|= SEC_RELOC
;
5115 /* That created the reloc sections. Set their sizes, and assign
5116 them file positions, and allocate some buffers. */
5117 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5119 if ((o
->flags
& SEC_RELOC
) != 0)
5121 if (!elf_link_size_reloc_section (abfd
,
5122 &elf_section_data (o
)->rel_hdr
,
5126 if (elf_section_data (o
)->rel_hdr2
5127 && !elf_link_size_reloc_section (abfd
,
5128 elf_section_data (o
)->rel_hdr2
,
5133 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5134 to count upwards while actually outputting the relocations. */
5135 elf_section_data (o
)->rel_count
= 0;
5136 elf_section_data (o
)->rel_count2
= 0;
5139 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5141 /* We have now assigned file positions for all the sections except
5142 .symtab and .strtab. We start the .symtab section at the current
5143 file position, and write directly to it. We build the .strtab
5144 section in memory. */
5145 bfd_get_symcount (abfd
) = 0;
5146 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5147 /* sh_name is set in prep_headers. */
5148 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5149 symtab_hdr
->sh_flags
= 0;
5150 symtab_hdr
->sh_addr
= 0;
5151 symtab_hdr
->sh_size
= 0;
5152 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5153 /* sh_link is set in assign_section_numbers. */
5154 /* sh_info is set below. */
5155 /* sh_offset is set just below. */
5156 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5158 off
= elf_tdata (abfd
)->next_file_pos
;
5159 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
5161 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5162 incorrect. We do not yet know the size of the .symtab section.
5163 We correct next_file_pos below, after we do know the size. */
5165 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5166 continuously seeking to the right position in the file. */
5167 if (! info
->keep_memory
|| max_sym_count
< 20)
5168 finfo
.symbuf_size
= 20;
5170 finfo
.symbuf_size
= max_sym_count
;
5171 amt
= finfo
.symbuf_size
;
5172 amt
*= sizeof (Elf_External_Sym
);
5173 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5174 if (finfo
.symbuf
== NULL
)
5176 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5178 amt
= finfo
.symbuf_size
;
5179 amt
*= sizeof (Elf_External_Sym_Shndx
);
5180 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5181 if (finfo
.symshndxbuf
== NULL
)
5185 /* Start writing out the symbol table. The first symbol is always a
5187 if (info
->strip
!= strip_all
5190 elfsym
.st_value
= 0;
5193 elfsym
.st_other
= 0;
5194 elfsym
.st_shndx
= SHN_UNDEF
;
5195 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5196 &elfsym
, bfd_und_section_ptr
))
5201 /* Some standard ELF linkers do this, but we don't because it causes
5202 bootstrap comparison failures. */
5203 /* Output a file symbol for the output file as the second symbol.
5204 We output this even if we are discarding local symbols, although
5205 I'm not sure if this is correct. */
5206 elfsym
.st_value
= 0;
5208 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5209 elfsym
.st_other
= 0;
5210 elfsym
.st_shndx
= SHN_ABS
;
5211 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5212 &elfsym
, bfd_abs_section_ptr
))
5216 /* Output a symbol for each section. We output these even if we are
5217 discarding local symbols, since they are used for relocs. These
5218 symbols have no names. We store the index of each one in the
5219 index field of the section, so that we can find it again when
5220 outputting relocs. */
5221 if (info
->strip
!= strip_all
5225 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5226 elfsym
.st_other
= 0;
5227 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5229 o
= section_from_elf_index (abfd
, i
);
5231 o
->target_index
= bfd_get_symcount (abfd
);
5232 elfsym
.st_shndx
= i
;
5233 if (info
->relocateable
|| o
== NULL
)
5234 elfsym
.st_value
= 0;
5236 elfsym
.st_value
= o
->vma
;
5237 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5240 if (i
== SHN_LORESERVE
)
5241 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5245 /* Allocate some memory to hold information read in from the input
5247 if (max_contents_size
!= 0)
5249 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5250 if (finfo
.contents
== NULL
)
5254 if (max_external_reloc_size
!= 0)
5256 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5257 if (finfo
.external_relocs
== NULL
)
5261 if (max_internal_reloc_count
!= 0)
5263 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5264 amt
*= sizeof (Elf_Internal_Rela
);
5265 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5266 if (finfo
.internal_relocs
== NULL
)
5270 if (max_sym_count
!= 0)
5272 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5273 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5274 if (finfo
.external_syms
== NULL
)
5277 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5278 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5279 if (finfo
.internal_syms
== NULL
)
5282 amt
= max_sym_count
* sizeof (long);
5283 finfo
.indices
= (long *) bfd_malloc (amt
);
5284 if (finfo
.indices
== NULL
)
5287 amt
= max_sym_count
* sizeof (asection
*);
5288 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5289 if (finfo
.sections
== NULL
)
5293 if (max_sym_shndx_count
!= 0)
5295 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5296 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5297 if (finfo
.locsym_shndx
== NULL
)
5301 if (finfo
.first_tls_sec
)
5303 unsigned int align
= 0;
5304 bfd_vma base
= finfo
.first_tls_sec
->vma
, end
= 0;
5307 for (sec
= finfo
.first_tls_sec
;
5308 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
5311 bfd_vma size
= sec
->_raw_size
;
5313 if (bfd_get_section_alignment (abfd
, sec
) > align
)
5314 align
= bfd_get_section_alignment (abfd
, sec
);
5315 if (sec
->_raw_size
== 0 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
5317 struct bfd_link_order
*o
;
5320 for (o
= sec
->link_order_head
; o
!= NULL
; o
= o
->next
)
5321 if (size
< o
->offset
+ o
->size
)
5322 size
= o
->offset
+ o
->size
;
5324 end
= sec
->vma
+ size
;
5326 elf_hash_table (info
)->tls_segment
5327 = bfd_zalloc (abfd
, sizeof (struct elf_link_tls_segment
));
5328 if (elf_hash_table (info
)->tls_segment
== NULL
)
5330 elf_hash_table (info
)->tls_segment
->start
= base
;
5331 elf_hash_table (info
)->tls_segment
->size
= end
- base
;
5332 elf_hash_table (info
)->tls_segment
->align
= align
;
5335 /* Since ELF permits relocations to be against local symbols, we
5336 must have the local symbols available when we do the relocations.
5337 Since we would rather only read the local symbols once, and we
5338 would rather not keep them in memory, we handle all the
5339 relocations for a single input file at the same time.
5341 Unfortunately, there is no way to know the total number of local
5342 symbols until we have seen all of them, and the local symbol
5343 indices precede the global symbol indices. This means that when
5344 we are generating relocateable output, and we see a reloc against
5345 a global symbol, we can not know the symbol index until we have
5346 finished examining all the local symbols to see which ones we are
5347 going to output. To deal with this, we keep the relocations in
5348 memory, and don't output them until the end of the link. This is
5349 an unfortunate waste of memory, but I don't see a good way around
5350 it. Fortunately, it only happens when performing a relocateable
5351 link, which is not the common case. FIXME: If keep_memory is set
5352 we could write the relocs out and then read them again; I don't
5353 know how bad the memory loss will be. */
5355 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5356 sub
->output_has_begun
= false;
5357 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5359 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5361 if (p
->type
== bfd_indirect_link_order
5362 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
5363 == bfd_target_elf_flavour
)
5364 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
5366 if (! sub
->output_has_begun
)
5368 if (! elf_link_input_bfd (&finfo
, sub
))
5370 sub
->output_has_begun
= true;
5373 else if (p
->type
== bfd_section_reloc_link_order
5374 || p
->type
== bfd_symbol_reloc_link_order
)
5376 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5381 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5387 /* Output any global symbols that got converted to local in a
5388 version script or due to symbol visibility. We do this in a
5389 separate step since ELF requires all local symbols to appear
5390 prior to any global symbols. FIXME: We should only do this if
5391 some global symbols were, in fact, converted to become local.
5392 FIXME: Will this work correctly with the Irix 5 linker? */
5393 eoinfo
.failed
= false;
5394 eoinfo
.finfo
= &finfo
;
5395 eoinfo
.localsyms
= true;
5396 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5401 /* That wrote out all the local symbols. Finish up the symbol table
5402 with the global symbols. Even if we want to strip everything we
5403 can, we still need to deal with those global symbols that got
5404 converted to local in a version script. */
5406 /* The sh_info field records the index of the first non local symbol. */
5407 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5410 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5412 Elf_Internal_Sym sym
;
5413 Elf_External_Sym
*dynsym
=
5414 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5415 long last_local
= 0;
5417 /* Write out the section symbols for the output sections. */
5424 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5427 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5430 Elf_External_Sym
*dest
;
5432 indx
= elf_section_data (s
)->this_idx
;
5433 BFD_ASSERT (indx
> 0);
5434 sym
.st_shndx
= indx
;
5435 sym
.st_value
= s
->vma
;
5436 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5437 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5440 last_local
= bfd_count_sections (abfd
);
5443 /* Write out the local dynsyms. */
5444 if (elf_hash_table (info
)->dynlocal
)
5446 struct elf_link_local_dynamic_entry
*e
;
5447 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5450 Elf_External_Sym
*dest
;
5452 sym
.st_size
= e
->isym
.st_size
;
5453 sym
.st_other
= e
->isym
.st_other
;
5455 /* Copy the internal symbol as is.
5456 Note that we saved a word of storage and overwrote
5457 the original st_name with the dynstr_index. */
5460 if (e
->isym
.st_shndx
!= SHN_UNDEF
5461 && (e
->isym
.st_shndx
< SHN_LORESERVE
5462 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5464 s
= bfd_section_from_elf_index (e
->input_bfd
,
5468 elf_section_data (s
->output_section
)->this_idx
;
5469 sym
.st_value
= (s
->output_section
->vma
5471 + e
->isym
.st_value
);
5474 if (last_local
< e
->dynindx
)
5475 last_local
= e
->dynindx
;
5477 dest
= dynsym
+ e
->dynindx
;
5478 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5482 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5486 /* We get the global symbols from the hash table. */
5487 eoinfo
.failed
= false;
5488 eoinfo
.localsyms
= false;
5489 eoinfo
.finfo
= &finfo
;
5490 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5495 /* If backend needs to output some symbols not present in the hash
5496 table, do it now. */
5497 if (bed
->elf_backend_output_arch_syms
)
5499 typedef boolean (*out_sym_func
) PARAMS ((PTR
, const char *,
5503 if (! ((*bed
->elf_backend_output_arch_syms
)
5504 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5508 /* Flush all symbols to the file. */
5509 if (! elf_link_flush_output_syms (&finfo
))
5512 /* Now we know the size of the symtab section. */
5513 off
+= symtab_hdr
->sh_size
;
5515 /* Finish up and write out the symbol string table (.strtab)
5517 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5518 /* sh_name was set in prep_headers. */
5519 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5520 symstrtab_hdr
->sh_flags
= 0;
5521 symstrtab_hdr
->sh_addr
= 0;
5522 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5523 symstrtab_hdr
->sh_entsize
= 0;
5524 symstrtab_hdr
->sh_link
= 0;
5525 symstrtab_hdr
->sh_info
= 0;
5526 /* sh_offset is set just below. */
5527 symstrtab_hdr
->sh_addralign
= 1;
5529 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
5530 elf_tdata (abfd
)->next_file_pos
= off
;
5532 if (bfd_get_symcount (abfd
) > 0)
5534 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5535 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5539 /* Adjust the relocs to have the correct symbol indices. */
5540 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5542 if ((o
->flags
& SEC_RELOC
) == 0)
5545 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5546 elf_section_data (o
)->rel_count
,
5547 elf_section_data (o
)->rel_hashes
);
5548 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5549 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5550 elf_section_data (o
)->rel_count2
,
5551 (elf_section_data (o
)->rel_hashes
5552 + elf_section_data (o
)->rel_count
));
5554 /* Set the reloc_count field to 0 to prevent write_relocs from
5555 trying to swap the relocs out itself. */
5559 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5560 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5562 /* If we are linking against a dynamic object, or generating a
5563 shared library, finish up the dynamic linking information. */
5566 Elf_External_Dyn
*dyncon
, *dynconend
;
5568 /* Fix up .dynamic entries. */
5569 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5570 BFD_ASSERT (o
!= NULL
);
5572 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5573 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5574 for (; dyncon
< dynconend
; dyncon
++)
5576 Elf_Internal_Dyn dyn
;
5580 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5587 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5589 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5591 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5592 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5595 if (dyn
.d_tag
!= DT_NULL
)
5597 dyn
.d_un
.d_val
= relativecount
;
5598 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5604 name
= info
->init_function
;
5607 name
= info
->fini_function
;
5610 struct elf_link_hash_entry
*h
;
5612 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5613 false, false, true);
5615 && (h
->root
.type
== bfd_link_hash_defined
5616 || h
->root
.type
== bfd_link_hash_defweak
))
5618 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5619 o
= h
->root
.u
.def
.section
;
5620 if (o
->output_section
!= NULL
)
5621 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5622 + o
->output_offset
);
5625 /* The symbol is imported from another shared
5626 library and does not apply to this one. */
5630 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5635 case DT_PREINIT_ARRAYSZ
:
5636 name
= ".preinit_array";
5638 case DT_INIT_ARRAYSZ
:
5639 name
= ".init_array";
5641 case DT_FINI_ARRAYSZ
:
5642 name
= ".fini_array";
5644 o
= bfd_get_section_by_name (abfd
, name
);
5647 (*_bfd_error_handler
)
5648 (_("%s: could not find output section %s"),
5649 bfd_get_filename (abfd
), name
);
5652 if (o
->_raw_size
== 0)
5653 (*_bfd_error_handler
)
5654 (_("warning: %s section has zero size"), name
);
5655 dyn
.d_un
.d_val
= o
->_raw_size
;
5656 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5659 case DT_PREINIT_ARRAY
:
5660 name
= ".preinit_array";
5663 name
= ".init_array";
5666 name
= ".fini_array";
5679 name
= ".gnu.version_d";
5682 name
= ".gnu.version_r";
5685 name
= ".gnu.version";
5687 o
= bfd_get_section_by_name (abfd
, name
);
5690 (*_bfd_error_handler
)
5691 (_("%s: could not find output section %s"),
5692 bfd_get_filename (abfd
), name
);
5695 dyn
.d_un
.d_ptr
= o
->vma
;
5696 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5703 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5708 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5710 Elf_Internal_Shdr
*hdr
;
5712 hdr
= elf_elfsections (abfd
)[i
];
5713 if (hdr
->sh_type
== type
5714 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5716 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5717 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5720 if (dyn
.d_un
.d_val
== 0
5721 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5722 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5726 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5732 /* If we have created any dynamic sections, then output them. */
5735 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5738 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5740 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5741 || o
->_raw_size
== 0
5742 || o
->output_section
== bfd_abs_section_ptr
)
5744 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5746 /* At this point, we are only interested in sections
5747 created by elf_link_create_dynamic_sections. */
5750 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5752 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5754 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5756 (file_ptr
) o
->output_offset
,
5762 /* The contents of the .dynstr section are actually in a
5764 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5765 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5766 || ! _bfd_elf_strtab_emit (abfd
,
5767 elf_hash_table (info
)->dynstr
))
5773 if (info
->relocateable
)
5775 boolean failed
= false;
5777 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
5782 /* If we have optimized stabs strings, output them. */
5783 if (elf_hash_table (info
)->stab_info
!= NULL
)
5785 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5789 if (info
->eh_frame_hdr
&& elf_hash_table (info
)->dynobj
)
5791 o
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5794 && (elf_section_data (o
)->sec_info_type
5795 == ELF_INFO_TYPE_EH_FRAME_HDR
))
5797 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, o
))
5802 if (finfo
.symstrtab
!= NULL
)
5803 _bfd_stringtab_free (finfo
.symstrtab
);
5804 if (finfo
.contents
!= NULL
)
5805 free (finfo
.contents
);
5806 if (finfo
.external_relocs
!= NULL
)
5807 free (finfo
.external_relocs
);
5808 if (finfo
.internal_relocs
!= NULL
)
5809 free (finfo
.internal_relocs
);
5810 if (finfo
.external_syms
!= NULL
)
5811 free (finfo
.external_syms
);
5812 if (finfo
.locsym_shndx
!= NULL
)
5813 free (finfo
.locsym_shndx
);
5814 if (finfo
.internal_syms
!= NULL
)
5815 free (finfo
.internal_syms
);
5816 if (finfo
.indices
!= NULL
)
5817 free (finfo
.indices
);
5818 if (finfo
.sections
!= NULL
)
5819 free (finfo
.sections
);
5820 if (finfo
.symbuf
!= NULL
)
5821 free (finfo
.symbuf
);
5822 if (finfo
.symshndxbuf
!= NULL
)
5823 free (finfo
.symbuf
);
5824 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5826 if ((o
->flags
& SEC_RELOC
) != 0
5827 && elf_section_data (o
)->rel_hashes
!= NULL
)
5828 free (elf_section_data (o
)->rel_hashes
);
5831 elf_tdata (abfd
)->linker
= true;
5836 if (finfo
.symstrtab
!= NULL
)
5837 _bfd_stringtab_free (finfo
.symstrtab
);
5838 if (finfo
.contents
!= NULL
)
5839 free (finfo
.contents
);
5840 if (finfo
.external_relocs
!= NULL
)
5841 free (finfo
.external_relocs
);
5842 if (finfo
.internal_relocs
!= NULL
)
5843 free (finfo
.internal_relocs
);
5844 if (finfo
.external_syms
!= NULL
)
5845 free (finfo
.external_syms
);
5846 if (finfo
.locsym_shndx
!= NULL
)
5847 free (finfo
.locsym_shndx
);
5848 if (finfo
.internal_syms
!= NULL
)
5849 free (finfo
.internal_syms
);
5850 if (finfo
.indices
!= NULL
)
5851 free (finfo
.indices
);
5852 if (finfo
.sections
!= NULL
)
5853 free (finfo
.sections
);
5854 if (finfo
.symbuf
!= NULL
)
5855 free (finfo
.symbuf
);
5856 if (finfo
.symshndxbuf
!= NULL
)
5857 free (finfo
.symbuf
);
5858 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5860 if ((o
->flags
& SEC_RELOC
) != 0
5861 && elf_section_data (o
)->rel_hashes
!= NULL
)
5862 free (elf_section_data (o
)->rel_hashes
);
5868 /* Add a symbol to the output symbol table. */
5871 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5872 struct elf_final_link_info
*finfo
;
5874 Elf_Internal_Sym
*elfsym
;
5875 asection
*input_sec
;
5877 Elf_External_Sym
*dest
;
5878 Elf_External_Sym_Shndx
*destshndx
;
5880 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5881 struct bfd_link_info
*info
,
5886 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5887 elf_backend_link_output_symbol_hook
;
5888 if (output_symbol_hook
!= NULL
)
5890 if (! ((*output_symbol_hook
)
5891 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5895 if (name
== (const char *) NULL
|| *name
== '\0')
5896 elfsym
->st_name
= 0;
5897 else if (input_sec
->flags
& SEC_EXCLUDE
)
5898 elfsym
->st_name
= 0;
5901 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5903 if (elfsym
->st_name
== (unsigned long) -1)
5907 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5909 if (! elf_link_flush_output_syms (finfo
))
5913 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5914 destshndx
= finfo
->symshndxbuf
;
5915 if (destshndx
!= NULL
)
5916 destshndx
+= finfo
->symbuf_count
;
5917 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
5918 ++finfo
->symbuf_count
;
5920 ++ bfd_get_symcount (finfo
->output_bfd
);
5925 /* Flush the output symbols to the file. */
5928 elf_link_flush_output_syms (finfo
)
5929 struct elf_final_link_info
*finfo
;
5931 if (finfo
->symbuf_count
> 0)
5933 Elf_Internal_Shdr
*hdr
;
5937 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5938 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5939 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5940 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5941 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5944 hdr
->sh_size
+= amt
;
5946 if (finfo
->symshndxbuf
!= NULL
)
5948 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_shndx_hdr
;
5949 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5950 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym_Shndx
);
5951 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5952 || (bfd_bwrite ((PTR
) finfo
->symshndxbuf
, amt
, finfo
->output_bfd
)
5956 hdr
->sh_size
+= amt
;
5959 finfo
->symbuf_count
= 0;
5965 /* Adjust all external symbols pointing into SEC_MERGE sections
5966 to reflect the object merging within the sections. */
5969 elf_link_sec_merge_syms (h
, data
)
5970 struct elf_link_hash_entry
*h
;
5975 if (h
->root
.type
== bfd_link_hash_warning
)
5976 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5978 if ((h
->root
.type
== bfd_link_hash_defined
5979 || h
->root
.type
== bfd_link_hash_defweak
)
5980 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5981 && elf_section_data (sec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
)
5983 bfd
*output_bfd
= (bfd
*) data
;
5985 h
->root
.u
.def
.value
=
5986 _bfd_merged_section_offset (output_bfd
,
5987 &h
->root
.u
.def
.section
,
5988 elf_section_data (sec
)->sec_info
,
5989 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5995 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5996 allowing an unsatisfied unversioned symbol in the DSO to match a
5997 versioned symbol that would normally require an explicit version. */
6000 elf_link_check_versioned_symbol (info
, h
)
6001 struct bfd_link_info
*info
;
6002 struct elf_link_hash_entry
*h
;
6004 bfd
*undef_bfd
= h
->root
.u
.undef
.abfd
;
6005 struct elf_link_loaded_list
*loaded
;
6007 if ((undef_bfd
->flags
& DYNAMIC
) == 0
6008 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
6009 || elf_dt_soname (h
->root
.u
.undef
.abfd
) == NULL
)
6012 for (loaded
= elf_hash_table (info
)->loaded
;
6014 loaded
= loaded
->next
)
6017 Elf_Internal_Shdr
*hdr
;
6018 bfd_size_type symcount
;
6019 bfd_size_type extsymcount
;
6020 bfd_size_type extsymoff
;
6021 Elf_Internal_Shdr
*versymhdr
;
6022 Elf_Internal_Sym
*isym
;
6023 Elf_Internal_Sym
*isymend
;
6024 Elf_Internal_Sym
*isymbuf
;
6025 Elf_External_Versym
*ever
;
6026 Elf_External_Versym
*extversym
;
6028 input
= loaded
->abfd
;
6030 /* We check each DSO for a possible hidden versioned definition. */
6031 if (input
== undef_bfd
6032 || (input
->flags
& DYNAMIC
) == 0
6033 || elf_dynversym (input
) == 0)
6036 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
6038 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6039 if (elf_bad_symtab (input
))
6041 extsymcount
= symcount
;
6046 extsymcount
= symcount
- hdr
->sh_info
;
6047 extsymoff
= hdr
->sh_info
;
6050 if (extsymcount
== 0)
6053 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
6055 if (isymbuf
== NULL
)
6058 /* Read in any version definitions. */
6059 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
6060 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
6061 if (extversym
== NULL
)
6064 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
6065 || (bfd_bread ((PTR
) extversym
, versymhdr
->sh_size
, input
)
6066 != versymhdr
->sh_size
))
6074 ever
= extversym
+ extsymoff
;
6075 isymend
= isymbuf
+ extsymcount
;
6076 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
6079 Elf_Internal_Versym iver
;
6081 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
6082 || isym
->st_shndx
== SHN_UNDEF
)
6085 name
= bfd_elf_string_from_elf_section (input
,
6088 if (strcmp (name
, h
->root
.root
.string
) != 0)
6091 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
6093 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
6095 /* If we have a non-hidden versioned sym, then it should
6096 have provided a definition for the undefined sym. */
6100 if ((iver
.vs_vers
& VERSYM_VERSION
) == 2)
6102 /* This is the oldest (default) sym. We can use it. */
6116 /* Add an external symbol to the symbol table. This is called from
6117 the hash table traversal routine. When generating a shared object,
6118 we go through the symbol table twice. The first time we output
6119 anything that might have been forced to local scope in a version
6120 script. The second time we output the symbols that are still
6124 elf_link_output_extsym (h
, data
)
6125 struct elf_link_hash_entry
*h
;
6128 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
6129 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
6131 Elf_Internal_Sym sym
;
6132 asection
*input_sec
;
6134 if (h
->root
.type
== bfd_link_hash_warning
)
6136 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6137 if (h
->root
.type
== bfd_link_hash_new
)
6141 /* Decide whether to output this symbol in this pass. */
6142 if (eoinfo
->localsyms
)
6144 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6149 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6153 /* If we are not creating a shared library, and this symbol is
6154 referenced by a shared library but is not defined anywhere, then
6155 warn that it is undefined. If we do not do this, the runtime
6156 linker will complain that the symbol is undefined when the
6157 program is run. We don't have to worry about symbols that are
6158 referenced by regular files, because we will already have issued
6159 warnings for them. */
6160 if (! finfo
->info
->relocateable
6161 && ! finfo
->info
->allow_shlib_undefined
6162 && ! finfo
->info
->shared
6163 && h
->root
.type
== bfd_link_hash_undefined
6164 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
6165 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
6166 && ! elf_link_check_versioned_symbol (finfo
->info
, h
))
6168 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6169 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
6170 (asection
*) NULL
, (bfd_vma
) 0, true)))
6172 eoinfo
->failed
= true;
6177 /* We don't want to output symbols that have never been mentioned by
6178 a regular file, or that we have been told to strip. However, if
6179 h->indx is set to -2, the symbol is used by a reloc and we must
6183 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
6184 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
6185 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
6186 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
6188 else if (finfo
->info
->strip
== strip_all
6189 || (finfo
->info
->strip
== strip_some
6190 && bfd_hash_lookup (finfo
->info
->keep_hash
,
6191 h
->root
.root
.string
,
6192 false, false) == NULL
))
6197 /* If we're stripping it, and it's not a dynamic symbol, there's
6198 nothing else to do unless it is a forced local symbol. */
6201 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6205 sym
.st_size
= h
->size
;
6206 sym
.st_other
= h
->other
;
6207 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6208 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6209 else if (h
->root
.type
== bfd_link_hash_undefweak
6210 || h
->root
.type
== bfd_link_hash_defweak
)
6211 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6213 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6215 switch (h
->root
.type
)
6218 case bfd_link_hash_new
:
6219 case bfd_link_hash_warning
:
6223 case bfd_link_hash_undefined
:
6224 case bfd_link_hash_undefweak
:
6225 input_sec
= bfd_und_section_ptr
;
6226 sym
.st_shndx
= SHN_UNDEF
;
6229 case bfd_link_hash_defined
:
6230 case bfd_link_hash_defweak
:
6232 input_sec
= h
->root
.u
.def
.section
;
6233 if (input_sec
->output_section
!= NULL
)
6236 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6237 input_sec
->output_section
);
6238 if (sym
.st_shndx
== SHN_BAD
)
6240 (*_bfd_error_handler
)
6241 (_("%s: could not find output section %s for input section %s"),
6242 bfd_get_filename (finfo
->output_bfd
),
6243 input_sec
->output_section
->name
,
6245 eoinfo
->failed
= true;
6249 /* ELF symbols in relocateable files are section relative,
6250 but in nonrelocateable files they are virtual
6252 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6253 if (! finfo
->info
->relocateable
)
6255 sym
.st_value
+= input_sec
->output_section
->vma
;
6256 if (h
->type
== STT_TLS
)
6258 /* STT_TLS symbols are relative to PT_TLS segment
6260 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6261 sym
.st_value
-= finfo
->first_tls_sec
->vma
;
6267 BFD_ASSERT (input_sec
->owner
== NULL
6268 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6269 sym
.st_shndx
= SHN_UNDEF
;
6270 input_sec
= bfd_und_section_ptr
;
6275 case bfd_link_hash_common
:
6276 input_sec
= h
->root
.u
.c
.p
->section
;
6277 sym
.st_shndx
= SHN_COMMON
;
6278 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6281 case bfd_link_hash_indirect
:
6282 /* These symbols are created by symbol versioning. They point
6283 to the decorated version of the name. For example, if the
6284 symbol foo@@GNU_1.2 is the default, which should be used when
6285 foo is used with no version, then we add an indirect symbol
6286 foo which points to foo@@GNU_1.2. We ignore these symbols,
6287 since the indirected symbol is already in the hash table. */
6291 /* Give the processor backend a chance to tweak the symbol value,
6292 and also to finish up anything that needs to be done for this
6293 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6294 forced local syms when non-shared is due to a historical quirk. */
6295 if ((h
->dynindx
!= -1
6296 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6297 && (finfo
->info
->shared
6298 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6299 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6301 struct elf_backend_data
*bed
;
6303 bed
= get_elf_backend_data (finfo
->output_bfd
);
6304 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6305 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6307 eoinfo
->failed
= true;
6312 /* If we are marking the symbol as undefined, and there are no
6313 non-weak references to this symbol from a regular object, then
6314 mark the symbol as weak undefined; if there are non-weak
6315 references, mark the symbol as strong. We can't do this earlier,
6316 because it might not be marked as undefined until the
6317 finish_dynamic_symbol routine gets through with it. */
6318 if (sym
.st_shndx
== SHN_UNDEF
6319 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6320 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6321 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6325 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6326 bindtype
= STB_GLOBAL
;
6328 bindtype
= STB_WEAK
;
6329 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6332 /* If a symbol is not defined locally, we clear the visibility
6334 if (! finfo
->info
->relocateable
6335 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6336 sym
.st_other
^= ELF_ST_VISIBILITY (sym
.st_other
);
6338 /* If this symbol should be put in the .dynsym section, then put it
6339 there now. We already know the symbol index. We also fill in
6340 the entry in the .hash section. */
6341 if (h
->dynindx
!= -1
6342 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6346 size_t hash_entry_size
;
6347 bfd_byte
*bucketpos
;
6349 Elf_External_Sym
*esym
;
6351 sym
.st_name
= h
->dynstr_index
;
6352 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6353 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6355 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6356 bucket
= h
->elf_hash_value
% bucketcount
;
6358 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6359 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6360 + (bucket
+ 2) * hash_entry_size
);
6361 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6362 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6364 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6365 ((bfd_byte
*) finfo
->hash_sec
->contents
6366 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6368 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6370 Elf_Internal_Versym iversym
;
6371 Elf_External_Versym
*eversym
;
6373 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6375 if (h
->verinfo
.verdef
== NULL
)
6376 iversym
.vs_vers
= 0;
6378 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6382 if (h
->verinfo
.vertree
== NULL
)
6383 iversym
.vs_vers
= 1;
6385 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6388 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6389 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6391 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6392 eversym
+= h
->dynindx
;
6393 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6397 /* If we're stripping it, then it was just a dynamic symbol, and
6398 there's nothing else to do. */
6399 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
6402 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6404 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6406 eoinfo
->failed
= true;
6413 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6414 originated from the section given by INPUT_REL_HDR) to the
6418 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6421 asection
*input_section
;
6422 Elf_Internal_Shdr
*input_rel_hdr
;
6423 Elf_Internal_Rela
*internal_relocs
;
6425 Elf_Internal_Rela
*irela
;
6426 Elf_Internal_Rela
*irelaend
;
6427 Elf_Internal_Shdr
*output_rel_hdr
;
6428 asection
*output_section
;
6429 unsigned int *rel_countp
= NULL
;
6430 struct elf_backend_data
*bed
;
6433 output_section
= input_section
->output_section
;
6434 output_rel_hdr
= NULL
;
6436 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6437 == input_rel_hdr
->sh_entsize
)
6439 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6440 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6442 else if (elf_section_data (output_section
)->rel_hdr2
6443 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6444 == input_rel_hdr
->sh_entsize
))
6446 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6447 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6451 (*_bfd_error_handler
)
6452 (_("%s: relocation size mismatch in %s section %s"),
6453 bfd_get_filename (output_bfd
),
6454 bfd_archive_filename (input_section
->owner
),
6455 input_section
->name
);
6456 bfd_set_error (bfd_error_wrong_object_format
);
6460 bed
= get_elf_backend_data (output_bfd
);
6461 irela
= internal_relocs
;
6462 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
6463 * bed
->s
->int_rels_per_ext_rel
);
6465 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6467 Elf_External_Rel
*erel
;
6468 Elf_Internal_Rel
*irel
;
6470 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
6471 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
6474 (*_bfd_error_handler
) (_("Error: out of memory"));
6478 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
6479 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erel
++)
6483 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
6485 irel
[i
].r_offset
= irela
[i
].r_offset
;
6486 irel
[i
].r_info
= irela
[i
].r_info
;
6487 BFD_ASSERT (irela
[i
].r_addend
== 0);
6490 if (bed
->s
->swap_reloc_out
)
6491 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (PTR
) erel
);
6493 elf_swap_reloc_out (output_bfd
, irel
, erel
);
6500 Elf_External_Rela
*erela
;
6502 BFD_ASSERT (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
6504 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
6505 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erela
++)
6506 if (bed
->s
->swap_reloca_out
)
6507 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
6509 elf_swap_reloca_out (output_bfd
, irela
, erela
);
6512 /* Bump the counter, so that we know where to add the next set of
6514 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6519 /* Link an input file into the linker output file. This function
6520 handles all the sections and relocations of the input file at once.
6521 This is so that we only have to read the local symbols once, and
6522 don't have to keep them in memory. */
6525 elf_link_input_bfd (finfo
, input_bfd
)
6526 struct elf_final_link_info
*finfo
;
6529 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
6530 bfd
*, asection
*, bfd_byte
*,
6531 Elf_Internal_Rela
*,
6532 Elf_Internal_Sym
*, asection
**));
6534 Elf_Internal_Shdr
*symtab_hdr
;
6537 Elf_Internal_Sym
*isymbuf
;
6538 Elf_Internal_Sym
*isym
;
6539 Elf_Internal_Sym
*isymend
;
6541 asection
**ppsection
;
6543 struct elf_backend_data
*bed
;
6544 boolean emit_relocs
;
6545 struct elf_link_hash_entry
**sym_hashes
;
6547 output_bfd
= finfo
->output_bfd
;
6548 bed
= get_elf_backend_data (output_bfd
);
6549 relocate_section
= bed
->elf_backend_relocate_section
;
6551 /* If this is a dynamic object, we don't want to do anything here:
6552 we don't want the local symbols, and we don't want the section
6554 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6557 emit_relocs
= (finfo
->info
->relocateable
6558 || finfo
->info
->emitrelocations
6559 || bed
->elf_backend_emit_relocs
);
6561 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6562 if (elf_bad_symtab (input_bfd
))
6564 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6569 locsymcount
= symtab_hdr
->sh_info
;
6570 extsymoff
= symtab_hdr
->sh_info
;
6573 /* Read the local symbols. */
6574 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
6575 if (isymbuf
== NULL
&& locsymcount
!= 0)
6577 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
6578 finfo
->internal_syms
,
6579 finfo
->external_syms
,
6580 finfo
->locsym_shndx
);
6581 if (isymbuf
== NULL
)
6585 /* Find local symbol sections and adjust values of symbols in
6586 SEC_MERGE sections. Write out those local symbols we know are
6587 going into the output file. */
6588 isymend
= isymbuf
+ locsymcount
;
6589 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
6591 isym
++, pindex
++, ppsection
++)
6595 Elf_Internal_Sym osym
;
6599 if (elf_bad_symtab (input_bfd
))
6601 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6608 if (isym
->st_shndx
== SHN_UNDEF
)
6609 isec
= bfd_und_section_ptr
;
6610 else if (isym
->st_shndx
< SHN_LORESERVE
6611 || isym
->st_shndx
> SHN_HIRESERVE
)
6613 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6615 && elf_section_data (isec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
6616 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6618 _bfd_merged_section_offset (output_bfd
, &isec
,
6619 elf_section_data (isec
)->sec_info
,
6620 isym
->st_value
, (bfd_vma
) 0);
6622 else if (isym
->st_shndx
== SHN_ABS
)
6623 isec
= bfd_abs_section_ptr
;
6624 else if (isym
->st_shndx
== SHN_COMMON
)
6625 isec
= bfd_com_section_ptr
;
6634 /* Don't output the first, undefined, symbol. */
6635 if (ppsection
== finfo
->sections
)
6638 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6640 /* We never output section symbols. Instead, we use the
6641 section symbol of the corresponding section in the output
6646 /* If we are stripping all symbols, we don't want to output this
6648 if (finfo
->info
->strip
== strip_all
)
6651 /* If we are discarding all local symbols, we don't want to
6652 output this one. If we are generating a relocateable output
6653 file, then some of the local symbols may be required by
6654 relocs; we output them below as we discover that they are
6656 if (finfo
->info
->discard
== discard_all
)
6659 /* If this symbol is defined in a section which we are
6660 discarding, we don't need to keep it, but note that
6661 linker_mark is only reliable for sections that have contents.
6662 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6663 as well as linker_mark. */
6664 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6666 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6667 || (! finfo
->info
->relocateable
6668 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6671 /* Get the name of the symbol. */
6672 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6677 /* See if we are discarding symbols with this name. */
6678 if ((finfo
->info
->strip
== strip_some
6679 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
6681 || (((finfo
->info
->discard
== discard_sec_merge
6682 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6683 || finfo
->info
->discard
== discard_l
)
6684 && bfd_is_local_label_name (input_bfd
, name
)))
6687 /* If we get here, we are going to output this symbol. */
6691 /* Adjust the section index for the output file. */
6692 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6693 isec
->output_section
);
6694 if (osym
.st_shndx
== SHN_BAD
)
6697 *pindex
= bfd_get_symcount (output_bfd
);
6699 /* ELF symbols in relocateable files are section relative, but
6700 in executable files they are virtual addresses. Note that
6701 this code assumes that all ELF sections have an associated
6702 BFD section with a reasonable value for output_offset; below
6703 we assume that they also have a reasonable value for
6704 output_section. Any special sections must be set up to meet
6705 these requirements. */
6706 osym
.st_value
+= isec
->output_offset
;
6707 if (! finfo
->info
->relocateable
)
6709 osym
.st_value
+= isec
->output_section
->vma
;
6710 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
6712 /* STT_TLS symbols are relative to PT_TLS segment base. */
6713 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
6714 osym
.st_value
-= finfo
->first_tls_sec
->vma
;
6718 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6722 /* Relocate the contents of each section. */
6723 sym_hashes
= elf_sym_hashes (input_bfd
);
6724 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6728 if (! o
->linker_mark
)
6730 /* This section was omitted from the link. */
6734 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6735 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6738 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6740 /* Section was created by elf_link_create_dynamic_sections
6745 /* Get the contents of the section. They have been cached by a
6746 relaxation routine. Note that o is a section in an input
6747 file, so the contents field will not have been set by any of
6748 the routines which work on output files. */
6749 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6750 contents
= elf_section_data (o
)->this_hdr
.contents
;
6753 contents
= finfo
->contents
;
6754 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6755 (file_ptr
) 0, o
->_raw_size
))
6759 if ((o
->flags
& SEC_RELOC
) != 0)
6761 Elf_Internal_Rela
*internal_relocs
;
6763 /* Get the swapped relocs. */
6764 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6765 (input_bfd
, o
, finfo
->external_relocs
,
6766 finfo
->internal_relocs
, false));
6767 if (internal_relocs
== NULL
6768 && o
->reloc_count
> 0)
6771 /* Run through the relocs looking for any against symbols
6772 from discarded sections and section symbols from
6773 removed link-once sections. Complain about relocs
6774 against discarded sections. Zero relocs against removed
6775 link-once sections. We should really complain if
6776 anything in the final link tries to use it, but
6777 DWARF-based exception handling might have an entry in
6778 .eh_frame to describe a routine in the linkonce section,
6779 and it turns out to be hard to remove the .eh_frame
6780 entry too. FIXME. */
6781 if (!finfo
->info
->relocateable
6782 && !elf_section_ignore_discarded_relocs (o
))
6784 Elf_Internal_Rela
*rel
, *relend
;
6786 rel
= internal_relocs
;
6787 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6788 for ( ; rel
< relend
; rel
++)
6790 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6792 if (r_symndx
>= locsymcount
6793 || (elf_bad_symtab (input_bfd
)
6794 && finfo
->sections
[r_symndx
] == NULL
))
6796 struct elf_link_hash_entry
*h
;
6798 h
= sym_hashes
[r_symndx
- extsymoff
];
6799 while (h
->root
.type
== bfd_link_hash_indirect
6800 || h
->root
.type
== bfd_link_hash_warning
)
6801 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6803 /* Complain if the definition comes from a
6804 discarded section. */
6805 if ((h
->root
.type
== bfd_link_hash_defined
6806 || h
->root
.type
== bfd_link_hash_defweak
)
6807 && elf_discarded_section (h
->root
.u
.def
.section
))
6809 #if BFD_VERSION_DATE < 20031005
6810 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6812 #if BFD_VERSION_DATE > 20021005
6813 (*finfo
->info
->callbacks
->warning
)
6815 _("warning: relocation against removed section; zeroing"),
6816 NULL
, input_bfd
, o
, rel
->r_offset
);
6818 BFD_ASSERT (r_symndx
!= 0);
6819 memset (rel
, 0, sizeof (*rel
));
6824 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6825 (finfo
->info
, h
->root
.root
.string
,
6826 input_bfd
, o
, rel
->r_offset
,
6834 asection
*sec
= finfo
->sections
[r_symndx
];
6836 if (sec
!= NULL
&& elf_discarded_section (sec
))
6838 #if BFD_VERSION_DATE < 20031005
6839 if ((o
->flags
& SEC_DEBUGGING
) != 0
6840 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6842 #if BFD_VERSION_DATE > 20021005
6843 (*finfo
->info
->callbacks
->warning
)
6845 _("warning: relocation against removed section"),
6846 NULL
, input_bfd
, o
, rel
->r_offset
);
6848 BFD_ASSERT (r_symndx
!= 0);
6850 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6858 = _("local symbols in discarded section %s");
6860 = strlen (sec
->name
) + strlen (msg
) - 1;
6861 char *buf
= (char *) bfd_malloc (amt
);
6864 sprintf (buf
, msg
, sec
->name
);
6866 buf
= (char *) sec
->name
;
6867 ok
= (*finfo
->info
->callbacks
6868 ->undefined_symbol
) (finfo
->info
, buf
,
6872 if (buf
!= sec
->name
)
6882 /* Relocate the section by invoking a back end routine.
6884 The back end routine is responsible for adjusting the
6885 section contents as necessary, and (if using Rela relocs
6886 and generating a relocateable output file) adjusting the
6887 reloc addend as necessary.
6889 The back end routine does not have to worry about setting
6890 the reloc address or the reloc symbol index.
6892 The back end routine is given a pointer to the swapped in
6893 internal symbols, and can access the hash table entries
6894 for the external symbols via elf_sym_hashes (input_bfd).
6896 When generating relocateable output, the back end routine
6897 must handle STB_LOCAL/STT_SECTION symbols specially. The
6898 output symbol is going to be a section symbol
6899 corresponding to the output section, which will require
6900 the addend to be adjusted. */
6902 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6903 input_bfd
, o
, contents
,
6911 Elf_Internal_Rela
*irela
;
6912 Elf_Internal_Rela
*irelaend
;
6913 struct elf_link_hash_entry
**rel_hash
;
6914 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
6915 unsigned int next_erel
;
6916 boolean (*reloc_emitter
) PARAMS ((bfd
*, asection
*,
6917 Elf_Internal_Shdr
*,
6918 Elf_Internal_Rela
*));
6919 boolean rela_normal
;
6921 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6922 rela_normal
= (bed
->rela_normal
6923 && (input_rel_hdr
->sh_entsize
6924 == sizeof (Elf_External_Rela
)));
6926 /* Adjust the reloc addresses and symbol indices. */
6928 irela
= internal_relocs
;
6929 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6930 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6931 + elf_section_data (o
->output_section
)->rel_count
6932 + elf_section_data (o
->output_section
)->rel_count2
);
6933 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6935 unsigned long r_symndx
;
6937 Elf_Internal_Sym sym
;
6939 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6945 irela
->r_offset
+= o
->output_offset
;
6947 /* Relocs in an executable have to be virtual addresses. */
6948 if (!finfo
->info
->relocateable
)
6949 irela
->r_offset
+= o
->output_section
->vma
;
6951 r_symndx
= ELF_R_SYM (irela
->r_info
);
6956 if (r_symndx
>= locsymcount
6957 || (elf_bad_symtab (input_bfd
)
6958 && finfo
->sections
[r_symndx
] == NULL
))
6960 struct elf_link_hash_entry
*rh
;
6963 /* This is a reloc against a global symbol. We
6964 have not yet output all the local symbols, so
6965 we do not know the symbol index of any global
6966 symbol. We set the rel_hash entry for this
6967 reloc to point to the global hash table entry
6968 for this symbol. The symbol index is then
6969 set at the end of elf_bfd_final_link. */
6970 indx
= r_symndx
- extsymoff
;
6971 rh
= elf_sym_hashes (input_bfd
)[indx
];
6972 while (rh
->root
.type
== bfd_link_hash_indirect
6973 || rh
->root
.type
== bfd_link_hash_warning
)
6974 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6976 /* Setting the index to -2 tells
6977 elf_link_output_extsym that this symbol is
6979 BFD_ASSERT (rh
->indx
< 0);
6987 /* This is a reloc against a local symbol. */
6990 sym
= isymbuf
[r_symndx
];
6991 sec
= finfo
->sections
[r_symndx
];
6992 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
6994 /* I suppose the backend ought to fill in the
6995 section of any STT_SECTION symbol against a
6996 processor specific section. If we have
6997 discarded a section, the output_section will
6998 be the absolute section. */
6999 if (bfd_is_abs_section (sec
)
7001 && bfd_is_abs_section (sec
->output_section
)))
7003 else if (sec
== NULL
|| sec
->owner
== NULL
)
7005 bfd_set_error (bfd_error_bad_value
);
7010 r_symndx
= sec
->output_section
->target_index
;
7011 BFD_ASSERT (r_symndx
!= 0);
7014 /* Adjust the addend according to where the
7015 section winds up in the output section. */
7017 irela
->r_addend
+= sec
->output_offset
;
7021 if (finfo
->indices
[r_symndx
] == -1)
7023 unsigned long shlink
;
7027 if (finfo
->info
->strip
== strip_all
)
7029 /* You can't do ld -r -s. */
7030 bfd_set_error (bfd_error_invalid_operation
);
7034 /* This symbol was skipped earlier, but
7035 since it is needed by a reloc, we
7036 must output it now. */
7037 shlink
= symtab_hdr
->sh_link
;
7038 name
= (bfd_elf_string_from_elf_section
7039 (input_bfd
, shlink
, sym
.st_name
));
7043 osec
= sec
->output_section
;
7045 _bfd_elf_section_from_bfd_section (output_bfd
,
7047 if (sym
.st_shndx
== SHN_BAD
)
7050 sym
.st_value
+= sec
->output_offset
;
7051 if (! finfo
->info
->relocateable
)
7053 sym
.st_value
+= osec
->vma
;
7054 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
7056 /* STT_TLS symbols are relative to PT_TLS
7058 BFD_ASSERT (finfo
->first_tls_sec
!= NULL
);
7059 sym
.st_value
-= finfo
->first_tls_sec
->vma
;
7063 finfo
->indices
[r_symndx
]
7064 = bfd_get_symcount (output_bfd
);
7066 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
))
7070 r_symndx
= finfo
->indices
[r_symndx
];
7073 irela
->r_info
= ELF_R_INFO (r_symndx
,
7074 ELF_R_TYPE (irela
->r_info
));
7077 /* Swap out the relocs. */
7078 if (bed
->elf_backend_emit_relocs
7079 && !(finfo
->info
->relocateable
7080 || finfo
->info
->emitrelocations
))
7081 reloc_emitter
= bed
->elf_backend_emit_relocs
;
7083 reloc_emitter
= elf_link_output_relocs
;
7085 if (input_rel_hdr
->sh_size
!= 0
7086 && ! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
,
7090 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
7091 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
7093 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
7094 * bed
->s
->int_rels_per_ext_rel
);
7095 if (! (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr2
,
7102 /* Write out the modified section contents. */
7103 if (bed
->elf_backend_write_section
7104 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
7106 /* Section written out. */
7108 else switch (elf_section_data (o
)->sec_info_type
)
7110 case ELF_INFO_TYPE_STABS
:
7111 if (! (_bfd_write_section_stabs
7113 &elf_hash_table (finfo
->info
)->stab_info
,
7114 o
, &elf_section_data (o
)->sec_info
, contents
)))
7117 case ELF_INFO_TYPE_MERGE
:
7118 if (! (_bfd_write_merged_section
7119 (output_bfd
, o
, elf_section_data (o
)->sec_info
)))
7122 case ELF_INFO_TYPE_EH_FRAME
:
7127 = bfd_get_section_by_name (elf_hash_table (finfo
->info
)->dynobj
,
7129 if (! (_bfd_elf_write_section_eh_frame (output_bfd
, o
, ehdrsec
,
7136 bfd_size_type sec_size
;
7138 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
7139 if (! (o
->flags
& SEC_EXCLUDE
)
7140 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
7142 (file_ptr
) o
->output_offset
,
7153 /* Generate a reloc when linking an ELF file. This is a reloc
7154 requested by the linker, and does come from any input file. This
7155 is used to build constructor and destructor tables when linking
7159 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
7161 struct bfd_link_info
*info
;
7162 asection
*output_section
;
7163 struct bfd_link_order
*link_order
;
7165 reloc_howto_type
*howto
;
7169 struct elf_link_hash_entry
**rel_hash_ptr
;
7170 Elf_Internal_Shdr
*rel_hdr
;
7171 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7173 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
7176 bfd_set_error (bfd_error_bad_value
);
7180 addend
= link_order
->u
.reloc
.p
->addend
;
7182 /* Figure out the symbol index. */
7183 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
7184 + elf_section_data (output_section
)->rel_count
7185 + elf_section_data (output_section
)->rel_count2
);
7186 if (link_order
->type
== bfd_section_reloc_link_order
)
7188 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
7189 BFD_ASSERT (indx
!= 0);
7190 *rel_hash_ptr
= NULL
;
7194 struct elf_link_hash_entry
*h
;
7196 /* Treat a reloc against a defined symbol as though it were
7197 actually against the section. */
7198 h
= ((struct elf_link_hash_entry
*)
7199 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
7200 link_order
->u
.reloc
.p
->u
.name
,
7201 false, false, true));
7203 && (h
->root
.type
== bfd_link_hash_defined
7204 || h
->root
.type
== bfd_link_hash_defweak
))
7208 section
= h
->root
.u
.def
.section
;
7209 indx
= section
->output_section
->target_index
;
7210 *rel_hash_ptr
= NULL
;
7211 /* It seems that we ought to add the symbol value to the
7212 addend here, but in practice it has already been added
7213 because it was passed to constructor_callback. */
7214 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7218 /* Setting the index to -2 tells elf_link_output_extsym that
7219 this symbol is used by a reloc. */
7226 if (! ((*info
->callbacks
->unattached_reloc
)
7227 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
7228 (asection
*) NULL
, (bfd_vma
) 0)))
7234 /* If this is an inplace reloc, we must write the addend into the
7236 if (howto
->partial_inplace
&& addend
!= 0)
7239 bfd_reloc_status_type rstat
;
7242 const char *sym_name
;
7244 size
= bfd_get_reloc_size (howto
);
7245 buf
= (bfd_byte
*) bfd_zmalloc (size
);
7246 if (buf
== (bfd_byte
*) NULL
)
7248 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
7255 case bfd_reloc_outofrange
:
7258 case bfd_reloc_overflow
:
7259 if (link_order
->type
== bfd_section_reloc_link_order
)
7260 sym_name
= bfd_section_name (output_bfd
,
7261 link_order
->u
.reloc
.p
->u
.section
);
7263 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7264 if (! ((*info
->callbacks
->reloc_overflow
)
7265 (info
, sym_name
, howto
->name
, addend
,
7266 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
7273 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
7274 (file_ptr
) link_order
->offset
, size
);
7280 /* The address of a reloc is relative to the section in a
7281 relocateable file, and is a virtual address in an executable
7283 offset
= link_order
->offset
;
7284 if (! info
->relocateable
)
7285 offset
+= output_section
->vma
;
7287 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7289 if (rel_hdr
->sh_type
== SHT_REL
)
7292 Elf_Internal_Rel
*irel
;
7293 Elf_External_Rel
*erel
;
7296 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
7297 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (size
);
7301 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7302 irel
[i
].r_offset
= offset
;
7303 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7305 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
7306 + elf_section_data (output_section
)->rel_count
);
7308 if (bed
->s
->swap_reloc_out
)
7309 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (bfd_byte
*) erel
);
7311 elf_swap_reloc_out (output_bfd
, irel
, erel
);
7318 Elf_Internal_Rela
*irela
;
7319 Elf_External_Rela
*erela
;
7322 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
7323 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (size
);
7327 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7328 irela
[i
].r_offset
= offset
;
7329 irela
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7330 irela
[0].r_addend
= addend
;
7332 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
7333 + elf_section_data (output_section
)->rel_count
);
7335 if (bed
->s
->swap_reloca_out
)
7336 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (bfd_byte
*) erela
);
7338 elf_swap_reloca_out (output_bfd
, irela
, erela
);
7341 ++elf_section_data (output_section
)->rel_count
;
7346 /* Allocate a pointer to live in a linker created section. */
7349 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7351 struct bfd_link_info
*info
;
7352 elf_linker_section_t
*lsect
;
7353 struct elf_link_hash_entry
*h
;
7354 const Elf_Internal_Rela
*rel
;
7356 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7357 elf_linker_section_pointers_t
*linker_section_ptr
;
7358 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7361 BFD_ASSERT (lsect
!= NULL
);
7363 /* Is this a global symbol? */
7366 /* Has this symbol already been allocated? If so, our work is done. */
7367 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7372 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7373 /* Make sure this symbol is output as a dynamic symbol. */
7374 if (h
->dynindx
== -1)
7376 if (! elf_link_record_dynamic_symbol (info
, h
))
7380 if (lsect
->rel_section
)
7381 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7385 /* Allocation of a pointer to a local symbol. */
7386 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7388 /* Allocate a table to hold the local symbols if first time. */
7391 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7392 register unsigned int i
;
7395 amt
*= sizeof (elf_linker_section_pointers_t
*);
7396 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7401 elf_local_ptr_offsets (abfd
) = ptr
;
7402 for (i
= 0; i
< num_symbols
; i
++)
7403 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7406 /* Has this symbol already been allocated? If so, our work is done. */
7407 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7412 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7416 /* If we are generating a shared object, we need to
7417 output a R_<xxx>_RELATIVE reloc so that the
7418 dynamic linker can adjust this GOT entry. */
7419 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7420 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7424 /* Allocate space for a pointer in the linker section, and allocate
7425 a new pointer record from internal memory. */
7426 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7427 amt
= sizeof (elf_linker_section_pointers_t
);
7428 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7430 if (!linker_section_ptr
)
7433 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7434 linker_section_ptr
->addend
= rel
->r_addend
;
7435 linker_section_ptr
->which
= lsect
->which
;
7436 linker_section_ptr
->written_address_p
= false;
7437 *ptr_linker_section_ptr
= linker_section_ptr
;
7440 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7442 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7443 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7444 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7445 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7446 if (lsect
->sym_hash
)
7448 /* Bump up symbol value if needed. */
7449 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7451 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7452 lsect
->sym_hash
->root
.root
.string
,
7453 (long) ARCH_SIZE
/ 8,
7454 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7460 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7462 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7466 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7467 lsect
->name
, (long) linker_section_ptr
->offset
,
7468 (long) lsect
->section
->_raw_size
);
7475 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7478 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7481 /* Fill in the address for a pointer generated in a linker section. */
7484 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7485 relocation
, rel
, relative_reloc
)
7488 struct bfd_link_info
*info
;
7489 elf_linker_section_t
*lsect
;
7490 struct elf_link_hash_entry
*h
;
7492 const Elf_Internal_Rela
*rel
;
7495 elf_linker_section_pointers_t
*linker_section_ptr
;
7497 BFD_ASSERT (lsect
!= NULL
);
7501 /* Handle global symbol. */
7502 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7503 (h
->linker_section_pointer
,
7507 BFD_ASSERT (linker_section_ptr
!= NULL
);
7509 if (! elf_hash_table (info
)->dynamic_sections_created
7512 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7514 /* This is actually a static link, or it is a
7515 -Bsymbolic link and the symbol is defined
7516 locally. We must initialize this entry in the
7519 When doing a dynamic link, we create a .rela.<xxx>
7520 relocation entry to initialize the value. This
7521 is done in the finish_dynamic_symbol routine. */
7522 if (!linker_section_ptr
->written_address_p
)
7524 linker_section_ptr
->written_address_p
= true;
7525 bfd_put_ptr (output_bfd
,
7526 relocation
+ linker_section_ptr
->addend
,
7527 (lsect
->section
->contents
7528 + linker_section_ptr
->offset
));
7534 /* Handle local symbol. */
7535 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7536 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7537 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7538 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7539 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7543 BFD_ASSERT (linker_section_ptr
!= NULL
);
7545 /* Write out pointer if it hasn't been rewritten out before. */
7546 if (!linker_section_ptr
->written_address_p
)
7548 linker_section_ptr
->written_address_p
= true;
7549 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7550 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7554 asection
*srel
= lsect
->rel_section
;
7555 Elf_Internal_Rela
*outrel
;
7556 Elf_External_Rela
*erel
;
7557 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7561 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
7562 outrel
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
7565 (*_bfd_error_handler
) (_("Error: out of memory"));
7569 /* We need to generate a relative reloc for the dynamic
7573 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7575 lsect
->rel_section
= srel
;
7578 BFD_ASSERT (srel
!= NULL
);
7580 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7581 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7582 + lsect
->section
->output_offset
7583 + linker_section_ptr
->offset
);
7584 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7585 outrel
[0].r_addend
= 0;
7586 erel
= (Elf_External_Rela
*) lsect
->section
->contents
;
7587 erel
+= elf_section_data (lsect
->section
)->rel_count
;
7588 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7589 ++elf_section_data (lsect
->section
)->rel_count
;
7596 relocation
= (lsect
->section
->output_offset
7597 + linker_section_ptr
->offset
7598 - lsect
->hole_offset
7599 - lsect
->sym_offset
);
7603 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7604 lsect
->name
, (long) relocation
, (long) relocation
);
7607 /* Subtract out the addend, because it will get added back in by the normal
7609 return relocation
- linker_section_ptr
->addend
;
7612 /* Garbage collect unused sections. */
7614 static boolean elf_gc_mark
7615 PARAMS ((struct bfd_link_info
*, asection
*,
7616 asection
* (*) (asection
*, struct bfd_link_info
*,
7617 Elf_Internal_Rela
*, struct elf_link_hash_entry
*,
7618 Elf_Internal_Sym
*)));
7620 static boolean elf_gc_sweep
7621 PARAMS ((struct bfd_link_info
*,
7622 boolean (*) (bfd
*, struct bfd_link_info
*, asection
*,
7623 const Elf_Internal_Rela
*)));
7625 static boolean elf_gc_sweep_symbol
7626 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7628 static boolean elf_gc_allocate_got_offsets
7629 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7631 static boolean elf_gc_propagate_vtable_entries_used
7632 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7634 static boolean elf_gc_smash_unused_vtentry_relocs
7635 PARAMS ((struct elf_link_hash_entry
*, PTR
));
7637 /* The mark phase of garbage collection. For a given section, mark
7638 it and any sections in this section's group, and all the sections
7639 which define symbols to which it refers. */
7642 elf_gc_mark (info
, sec
, gc_mark_hook
)
7643 struct bfd_link_info
*info
;
7645 asection
* (*gc_mark_hook
) PARAMS ((asection
*, struct bfd_link_info
*,
7646 Elf_Internal_Rela
*,
7647 struct elf_link_hash_entry
*,
7648 Elf_Internal_Sym
*));
7651 asection
*group_sec
;
7655 /* Mark all the sections in the group. */
7656 group_sec
= elf_section_data (sec
)->next_in_group
;
7657 if (group_sec
&& !group_sec
->gc_mark
)
7658 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7661 /* Look through the section relocs. */
7663 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7665 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7666 Elf_Internal_Shdr
*symtab_hdr
;
7667 struct elf_link_hash_entry
**sym_hashes
;
7670 bfd
*input_bfd
= sec
->owner
;
7671 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7672 Elf_Internal_Sym
*isym
= NULL
;
7674 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7675 sym_hashes
= elf_sym_hashes (input_bfd
);
7677 /* Read the local symbols. */
7678 if (elf_bad_symtab (input_bfd
))
7680 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7684 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7686 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
7687 if (isym
== NULL
&& nlocsyms
!= 0)
7689 isym
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, nlocsyms
, 0,
7695 /* Read the relocations. */
7696 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7697 (input_bfd
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7698 info
->keep_memory
));
7699 if (relstart
== NULL
)
7704 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7706 for (rel
= relstart
; rel
< relend
; rel
++)
7708 unsigned long r_symndx
;
7710 struct elf_link_hash_entry
*h
;
7712 r_symndx
= ELF_R_SYM (rel
->r_info
);
7716 if (r_symndx
>= nlocsyms
7717 || ELF_ST_BIND (isym
[r_symndx
].st_info
) != STB_LOCAL
)
7719 h
= sym_hashes
[r_symndx
- extsymoff
];
7720 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, h
, NULL
);
7724 rsec
= (*gc_mark_hook
) (sec
, info
, rel
, NULL
, &isym
[r_symndx
]);
7727 if (rsec
&& !rsec
->gc_mark
)
7729 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
7731 else if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7740 if (elf_section_data (sec
)->relocs
!= relstart
)
7743 if (isym
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isym
)
7745 if (! info
->keep_memory
)
7748 symtab_hdr
->contents
= (unsigned char *) isym
;
7755 /* The sweep phase of garbage collection. Remove all garbage sections. */
7758 elf_gc_sweep (info
, gc_sweep_hook
)
7759 struct bfd_link_info
*info
;
7760 boolean (*gc_sweep_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
7761 asection
*, const Elf_Internal_Rela
*));
7765 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7769 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7772 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7774 /* Keep special sections. Keep .debug sections. */
7775 if ((o
->flags
& SEC_LINKER_CREATED
)
7776 || (o
->flags
& SEC_DEBUGGING
))
7782 /* Skip sweeping sections already excluded. */
7783 if (o
->flags
& SEC_EXCLUDE
)
7786 /* Since this is early in the link process, it is simple
7787 to remove a section from the output. */
7788 o
->flags
|= SEC_EXCLUDE
;
7790 /* But we also have to update some of the relocation
7791 info we collected before. */
7793 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7795 Elf_Internal_Rela
*internal_relocs
;
7798 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7799 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7800 if (internal_relocs
== NULL
)
7803 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7805 if (elf_section_data (o
)->relocs
!= internal_relocs
)
7806 free (internal_relocs
);
7814 /* Remove the symbols that were in the swept sections from the dynamic
7815 symbol table. GCFIXME: Anyone know how to get them out of the
7816 static symbol table as well? */
7820 elf_link_hash_traverse (elf_hash_table (info
),
7821 elf_gc_sweep_symbol
,
7824 elf_hash_table (info
)->dynsymcount
= i
;
7830 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7833 elf_gc_sweep_symbol (h
, idxptr
)
7834 struct elf_link_hash_entry
*h
;
7837 int *idx
= (int *) idxptr
;
7839 if (h
->root
.type
== bfd_link_hash_warning
)
7840 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7842 if (h
->dynindx
!= -1
7843 && ((h
->root
.type
!= bfd_link_hash_defined
7844 && h
->root
.type
!= bfd_link_hash_defweak
)
7845 || h
->root
.u
.def
.section
->gc_mark
))
7846 h
->dynindx
= (*idx
)++;
7851 /* Propogate collected vtable information. This is called through
7852 elf_link_hash_traverse. */
7855 elf_gc_propagate_vtable_entries_used (h
, okp
)
7856 struct elf_link_hash_entry
*h
;
7859 if (h
->root
.type
== bfd_link_hash_warning
)
7860 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7862 /* Those that are not vtables. */
7863 if (h
->vtable_parent
== NULL
)
7866 /* Those vtables that do not have parents, we cannot merge. */
7867 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7870 /* If we've already been done, exit. */
7871 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7874 /* Make sure the parent's table is up to date. */
7875 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7877 if (h
->vtable_entries_used
== NULL
)
7879 /* None of this table's entries were referenced. Re-use the
7881 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7882 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7889 /* Or the parent's entries into ours. */
7890 cu
= h
->vtable_entries_used
;
7892 pu
= h
->vtable_parent
->vtable_entries_used
;
7895 asection
*sec
= h
->root
.u
.def
.section
;
7896 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7897 int file_align
= bed
->s
->file_align
;
7899 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7914 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7915 struct elf_link_hash_entry
*h
;
7919 bfd_vma hstart
, hend
;
7920 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7921 struct elf_backend_data
*bed
;
7924 if (h
->root
.type
== bfd_link_hash_warning
)
7925 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7927 /* Take care of both those symbols that do not describe vtables as
7928 well as those that are not loaded. */
7929 if (h
->vtable_parent
== NULL
)
7932 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7933 || h
->root
.type
== bfd_link_hash_defweak
);
7935 sec
= h
->root
.u
.def
.section
;
7936 hstart
= h
->root
.u
.def
.value
;
7937 hend
= hstart
+ h
->size
;
7939 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7940 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
7942 return *(boolean
*) okp
= false;
7943 bed
= get_elf_backend_data (sec
->owner
);
7944 file_align
= bed
->s
->file_align
;
7946 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7948 for (rel
= relstart
; rel
< relend
; ++rel
)
7949 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7951 /* If the entry is in use, do nothing. */
7952 if (h
->vtable_entries_used
7953 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7955 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7956 if (h
->vtable_entries_used
[entry
])
7959 /* Otherwise, kill it. */
7960 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7966 /* Do mark and sweep of unused sections. */
7969 elf_gc_sections (abfd
, info
)
7971 struct bfd_link_info
*info
;
7975 asection
* (*gc_mark_hook
)
7976 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7977 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7979 if (!get_elf_backend_data (abfd
)->can_gc_sections
7980 || info
->relocateable
|| info
->emitrelocations
7981 || elf_hash_table (info
)->dynamic_sections_created
)
7984 /* Apply transitive closure to the vtable entry usage info. */
7985 elf_link_hash_traverse (elf_hash_table (info
),
7986 elf_gc_propagate_vtable_entries_used
,
7991 /* Kill the vtable relocations that were not used. */
7992 elf_link_hash_traverse (elf_hash_table (info
),
7993 elf_gc_smash_unused_vtentry_relocs
,
7998 /* Grovel through relocs to find out who stays ... */
8000 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
8001 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
8005 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
8008 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
8010 if (o
->flags
& SEC_KEEP
)
8011 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
8016 /* ... and mark SEC_EXCLUDE for those that go. */
8017 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
8023 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
8026 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
8029 struct elf_link_hash_entry
*h
;
8032 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
8033 struct elf_link_hash_entry
**search
, *child
;
8034 bfd_size_type extsymcount
;
8036 /* The sh_info field of the symtab header tells us where the
8037 external symbols start. We don't care about the local symbols at
8039 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
8040 if (!elf_bad_symtab (abfd
))
8041 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
8043 sym_hashes
= elf_sym_hashes (abfd
);
8044 sym_hashes_end
= sym_hashes
+ extsymcount
;
8046 /* Hunt down the child symbol, which is in this section at the same
8047 offset as the relocation. */
8048 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
8050 if ((child
= *search
) != NULL
8051 && (child
->root
.type
== bfd_link_hash_defined
8052 || child
->root
.type
== bfd_link_hash_defweak
)
8053 && child
->root
.u
.def
.section
== sec
8054 && child
->root
.u
.def
.value
== offset
)
8058 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
8059 bfd_archive_filename (abfd
), sec
->name
,
8060 (unsigned long) offset
);
8061 bfd_set_error (bfd_error_invalid_operation
);
8067 /* This *should* only be the absolute section. It could potentially
8068 be that someone has defined a non-global vtable though, which
8069 would be bad. It isn't worth paging in the local symbols to be
8070 sure though; that case should simply be handled by the assembler. */
8072 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
8075 child
->vtable_parent
= h
;
8080 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
8083 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
8084 bfd
*abfd ATTRIBUTE_UNUSED
;
8085 asection
*sec ATTRIBUTE_UNUSED
;
8086 struct elf_link_hash_entry
*h
;
8089 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8090 int file_align
= bed
->s
->file_align
;
8092 if (addend
>= h
->vtable_entries_size
)
8095 boolean
*ptr
= h
->vtable_entries_used
;
8097 /* While the symbol is undefined, we have to be prepared to handle
8099 if (h
->root
.type
== bfd_link_hash_undefined
)
8106 /* Oops! We've got a reference past the defined end of
8107 the table. This is probably a bug -- shall we warn? */
8112 /* Allocate one extra entry for use as a "done" flag for the
8113 consolidation pass. */
8114 bytes
= (size
/ file_align
+ 1) * sizeof (boolean
);
8118 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
8124 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
8125 * sizeof (boolean
));
8126 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
8130 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
8135 /* And arrange for that done flag to be at index -1. */
8136 h
->vtable_entries_used
= ptr
+ 1;
8137 h
->vtable_entries_size
= size
;
8140 h
->vtable_entries_used
[addend
/ file_align
] = true;
8145 /* And an accompanying bit to work out final got entry offsets once
8146 we're done. Should be called from final_link. */
8149 elf_gc_common_finalize_got_offsets (abfd
, info
)
8151 struct bfd_link_info
*info
;
8154 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8157 /* The GOT offset is relative to the .got section, but the GOT header is
8158 put into the .got.plt section, if the backend uses it. */
8159 if (bed
->want_got_plt
)
8162 gotoff
= bed
->got_header_size
;
8164 /* Do the local .got entries first. */
8165 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
8167 bfd_signed_vma
*local_got
;
8168 bfd_size_type j
, locsymcount
;
8169 Elf_Internal_Shdr
*symtab_hdr
;
8171 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
8174 local_got
= elf_local_got_refcounts (i
);
8178 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
8179 if (elf_bad_symtab (i
))
8180 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8182 locsymcount
= symtab_hdr
->sh_info
;
8184 for (j
= 0; j
< locsymcount
; ++j
)
8186 if (local_got
[j
] > 0)
8188 local_got
[j
] = gotoff
;
8189 gotoff
+= ARCH_SIZE
/ 8;
8192 local_got
[j
] = (bfd_vma
) -1;
8196 /* Then the global .got entries. .plt refcounts are handled by
8197 adjust_dynamic_symbol */
8198 elf_link_hash_traverse (elf_hash_table (info
),
8199 elf_gc_allocate_got_offsets
,
8204 /* We need a special top-level link routine to convert got reference counts
8205 to real got offsets. */
8208 elf_gc_allocate_got_offsets (h
, offarg
)
8209 struct elf_link_hash_entry
*h
;
8212 bfd_vma
*off
= (bfd_vma
*) offarg
;
8214 if (h
->root
.type
== bfd_link_hash_warning
)
8215 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8217 if (h
->got
.refcount
> 0)
8219 h
->got
.offset
= off
[0];
8220 off
[0] += ARCH_SIZE
/ 8;
8223 h
->got
.offset
= (bfd_vma
) -1;
8228 /* Many folk need no more in the way of final link than this, once
8229 got entry reference counting is enabled. */
8232 elf_gc_common_final_link (abfd
, info
)
8234 struct bfd_link_info
*info
;
8236 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
8239 /* Invoke the regular ELF backend linker to do all the work. */
8240 return elf_bfd_final_link (abfd
, info
);
8243 /* This function will be called though elf_link_hash_traverse to store
8244 all hash value of the exported symbols in an array. */
8247 elf_collect_hash_codes (h
, data
)
8248 struct elf_link_hash_entry
*h
;
8251 unsigned long **valuep
= (unsigned long **) data
;
8257 if (h
->root
.type
== bfd_link_hash_warning
)
8258 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8260 /* Ignore indirect symbols. These are added by the versioning code. */
8261 if (h
->dynindx
== -1)
8264 name
= h
->root
.root
.string
;
8265 p
= strchr (name
, ELF_VER_CHR
);
8268 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8269 memcpy (alc
, name
, (size_t) (p
- name
));
8270 alc
[p
- name
] = '\0';
8274 /* Compute the hash value. */
8275 ha
= bfd_elf_hash (name
);
8277 /* Store the found hash value in the array given as the argument. */
8280 /* And store it in the struct so that we can put it in the hash table
8282 h
->elf_hash_value
= ha
;
8291 elf_reloc_symbol_deleted_p (offset
, cookie
)
8295 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8297 if (rcookie
->bad_symtab
)
8298 rcookie
->rel
= rcookie
->rels
;
8300 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8302 unsigned long r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8304 if (! rcookie
->bad_symtab
)
8305 if (rcookie
->rel
->r_offset
> offset
)
8307 if (rcookie
->rel
->r_offset
!= offset
)
8310 if (r_symndx
>= rcookie
->locsymcount
8311 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
8313 struct elf_link_hash_entry
*h
;
8315 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8317 while (h
->root
.type
== bfd_link_hash_indirect
8318 || h
->root
.type
== bfd_link_hash_warning
)
8319 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8321 if ((h
->root
.type
== bfd_link_hash_defined
8322 || h
->root
.type
== bfd_link_hash_defweak
)
8323 && elf_discarded_section (h
->root
.u
.def
.section
))
8330 /* It's not a relocation against a global symbol,
8331 but it could be a relocation against a local
8332 symbol for a discarded section. */
8334 Elf_Internal_Sym
*isym
;
8336 /* Need to: get the symbol; get the section. */
8337 isym
= &rcookie
->locsyms
[r_symndx
];
8338 if (isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
8340 isec
= section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
8341 if (isec
!= NULL
&& elf_discarded_section (isec
))
8350 /* Discard unneeded references to discarded sections.
8351 Returns true if any section's size was changed. */
8352 /* This function assumes that the relocations are in sorted order,
8353 which is true for all known assemblers. */
8356 elf_bfd_discard_info (output_bfd
, info
)
8358 struct bfd_link_info
*info
;
8360 struct elf_reloc_cookie cookie
;
8361 asection
*stab
, *eh
, *ehdr
;
8362 Elf_Internal_Shdr
*symtab_hdr
;
8363 struct elf_backend_data
*bed
;
8365 boolean ret
= false;
8366 boolean strip
= info
->strip
== strip_all
|| info
->strip
== strip_debugger
;
8368 if (info
->relocateable
8369 || info
->traditional_format
8370 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8371 || ! is_elf_hash_table (info
))
8375 if (elf_hash_table (info
)->dynobj
!= NULL
)
8376 ehdr
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
8379 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8381 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8384 bed
= get_elf_backend_data (abfd
);
8386 if ((abfd
->flags
& DYNAMIC
) != 0)
8392 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8393 if (eh
&& (eh
->_raw_size
== 0
8394 || bfd_is_abs_section (eh
->output_section
)))
8401 stab
= bfd_get_section_by_name (abfd
, ".stab");
8402 if (stab
&& (stab
->_raw_size
== 0
8403 || bfd_is_abs_section (stab
->output_section
)))
8407 || elf_section_data(stab
)->sec_info_type
!= ELF_INFO_TYPE_STABS
)
8409 && (strip
|| ! bed
->elf_backend_discard_info
))
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
=
8419 symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8420 cookie
.extsymoff
= 0;
8424 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8425 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8428 cookie
.locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
8429 if (cookie
.locsyms
== NULL
&& cookie
.locsymcount
!= 0)
8431 cookie
.locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
8432 cookie
.locsymcount
, 0,
8434 if (cookie
.locsyms
== NULL
)
8440 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8441 (abfd
, stab
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8442 info
->keep_memory
));
8445 cookie
.rel
= cookie
.rels
;
8447 cookie
.rels
+ stab
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8448 if (_bfd_discard_section_stabs (abfd
, stab
,
8449 elf_section_data (stab
)->sec_info
,
8450 elf_reloc_symbol_deleted_p
,
8453 if (elf_section_data (stab
)->relocs
!= cookie
.rels
)
8462 cookie
.relend
= NULL
;
8463 if (eh
->reloc_count
)
8464 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8465 (abfd
, eh
, (PTR
) NULL
, (Elf_Internal_Rela
*) NULL
,
8466 info
->keep_memory
));
8469 cookie
.rel
= cookie
.rels
;
8471 cookie
.rels
+ eh
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8473 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
, ehdr
,
8474 elf_reloc_symbol_deleted_p
,
8477 if (cookie
.rels
&& elf_section_data (eh
)->relocs
!= cookie
.rels
)
8481 if (bed
->elf_backend_discard_info
)
8483 if (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 (ehdr
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
, ehdr
))
8503 elf_section_ignore_discarded_relocs (sec
)
8506 struct elf_backend_data
*bed
;
8508 switch (elf_section_data (sec
)->sec_info_type
)
8510 case ELF_INFO_TYPE_STABS
:
8511 case ELF_INFO_TYPE_EH_FRAME
:
8517 bed
= get_elf_backend_data (sec
->owner
);
8518 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8519 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))