2 Copyright 1995, 1996 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static Elf_Internal_Rela
*elf_link_read_relocs
27 PARAMS ((bfd
*, asection
*, PTR
, Elf_Internal_Rela
*, boolean
));
28 static boolean elf_export_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
30 static boolean elf_adjust_dynamic_symbol
31 PARAMS ((struct elf_link_hash_entry
*, PTR
));
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
39 struct bfd_link_info
*info
;
42 /* Given an ELF BFD, add symbols to the global hash table as
46 elf_bfd_link_add_symbols (abfd
, info
)
48 struct bfd_link_info
*info
;
50 switch (bfd_get_format (abfd
))
53 return elf_link_add_object_symbols (abfd
, info
);
55 return elf_link_add_archive_symbols (abfd
, info
);
57 bfd_set_error (bfd_error_wrong_format
);
63 /* Add symbols from an ELF archive file to the linker hash table. We
64 don't use _bfd_generic_link_add_archive_symbols because of a
65 problem which arises on UnixWare. The UnixWare libc.so is an
66 archive which includes an entry libc.so.1 which defines a bunch of
67 symbols. The libc.so archive also includes a number of other
68 object files, which also define symbols, some of which are the same
69 as those defined in libc.so.1. Correct linking requires that we
70 consider each object file in turn, and include it if it defines any
71 symbols we need. _bfd_generic_link_add_archive_symbols does not do
72 this; it looks through the list of undefined symbols, and includes
73 any object file which defines them. When this algorithm is used on
74 UnixWare, it winds up pulling in libc.so.1 early and defining a
75 bunch of symbols. This means that some of the other objects in the
76 archive are not included in the link, which is incorrect since they
77 precede libc.so.1 in the archive.
79 Fortunately, ELF archive handling is simpler than that done by
80 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
81 oddities. In ELF, if we find a symbol in the archive map, and the
82 symbol is currently undefined, we know that we must pull in that
85 Unfortunately, we do have to make multiple passes over the symbol
86 table until nothing further is resolved. */
89 elf_link_add_archive_symbols (abfd
, info
)
91 struct bfd_link_info
*info
;
94 boolean
*defined
= NULL
;
95 boolean
*included
= NULL
;
99 if (! bfd_has_map (abfd
))
101 /* An empty archive is a special case. */
102 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
104 bfd_set_error (bfd_error_no_armap
);
108 /* Keep track of all symbols we know to be already defined, and all
109 files we know to be already included. This is to speed up the
110 second and subsequent passes. */
111 c
= bfd_ardata (abfd
)->symdef_count
;
114 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
115 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
116 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
118 memset (defined
, 0, c
* sizeof (boolean
));
119 memset (included
, 0, c
* sizeof (boolean
));
121 symdefs
= bfd_ardata (abfd
)->symdefs
;
134 symdefend
= symdef
+ c
;
135 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
137 struct elf_link_hash_entry
*h
;
139 struct bfd_link_hash_entry
*undefs_tail
;
142 if (defined
[i
] || included
[i
])
144 if (symdef
->file_offset
== last
)
150 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
151 false, false, false);
152 if (h
== (struct elf_link_hash_entry
*) NULL
)
154 if (h
->root
.type
!= bfd_link_hash_undefined
)
156 if (h
->root
.type
!= bfd_link_hash_undefweak
)
161 /* We need to include this archive member. */
163 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
164 if (element
== (bfd
*) NULL
)
167 if (! bfd_check_format (element
, bfd_object
))
170 /* Doublecheck that we have not included this object
171 already--it should be impossible, but there may be
172 something wrong with the archive. */
173 if (element
->archive_pass
!= 0)
175 bfd_set_error (bfd_error_bad_value
);
178 element
->archive_pass
= 1;
180 undefs_tail
= info
->hash
->undefs_tail
;
182 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
185 if (! elf_link_add_object_symbols (element
, info
))
188 /* If there are any new undefined symbols, we need to make
189 another pass through the archive in order to see whether
190 they can be defined. FIXME: This isn't perfect, because
191 common symbols wind up on undefs_tail and because an
192 undefined symbol which is defined later on in this pass
193 does not require another pass. This isn't a bug, but it
194 does make the code less efficient than it could be. */
195 if (undefs_tail
!= info
->hash
->undefs_tail
)
198 /* Look backward to mark all symbols from this object file
199 which we have already seen in this pass. */
203 included
[mark
] = true;
208 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
210 /* We mark subsequent symbols from this object file as we go
211 on through the loop. */
212 last
= symdef
->file_offset
;
223 if (defined
!= (boolean
*) NULL
)
225 if (included
!= (boolean
*) NULL
)
230 /* Add symbols from an ELF object file to the linker hash table. */
233 elf_link_add_object_symbols (abfd
, info
)
235 struct bfd_link_info
*info
;
237 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
238 const Elf_Internal_Sym
*,
239 const char **, flagword
*,
240 asection
**, bfd_vma
*));
241 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
242 asection
*, const Elf_Internal_Rela
*));
244 Elf_Internal_Shdr
*hdr
;
248 Elf_External_Sym
*buf
= NULL
;
249 struct elf_link_hash_entry
**sym_hash
;
251 Elf_External_Dyn
*dynbuf
= NULL
;
252 struct elf_link_hash_entry
*weaks
;
253 Elf_External_Sym
*esym
;
254 Elf_External_Sym
*esymend
;
256 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
257 collect
= get_elf_backend_data (abfd
)->collect
;
259 /* As a GNU extension, any input sections which are named
260 .gnu.warning.SYMBOL are treated as warning symbols for the given
261 symbol. This differs from .gnu.warning sections, which generate
262 warnings when they are included in an output file. */
267 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
271 name
= bfd_get_section_name (abfd
, s
);
272 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
277 sz
= bfd_section_size (abfd
, s
);
278 msg
= (char *) bfd_alloc (abfd
, sz
);
282 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
285 if (! (_bfd_generic_link_add_one_symbol
287 name
+ sizeof ".gnu.warning." - 1,
288 BSF_WARNING
, s
, (bfd_vma
) 0, msg
, false, collect
,
289 (struct bfd_link_hash_entry
**) NULL
)))
292 if (! info
->relocateable
)
294 /* Clobber the section size so that the warning does
295 not get copied into the output file. */
302 /* A stripped shared library might only have a dynamic symbol table,
303 not a regular symbol table. In that case we can still go ahead
304 and link using the dynamic symbol table. */
305 if (elf_onesymtab (abfd
) == 0
306 && elf_dynsymtab (abfd
) != 0)
308 elf_onesymtab (abfd
) = elf_dynsymtab (abfd
);
309 elf_tdata (abfd
)->symtab_hdr
= elf_tdata (abfd
)->dynsymtab_hdr
;
312 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
313 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
315 /* The sh_info field of the symtab header tells us where the
316 external symbols start. We don't care about the local symbols at
318 if (elf_bad_symtab (abfd
))
320 extsymcount
= symcount
;
325 extsymcount
= symcount
- hdr
->sh_info
;
326 extsymoff
= hdr
->sh_info
;
329 buf
= ((Elf_External_Sym
*)
330 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
331 if (buf
== NULL
&& extsymcount
!= 0)
334 /* We store a pointer to the hash table entry for each external
336 sym_hash
= ((struct elf_link_hash_entry
**)
338 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
339 if (sym_hash
== NULL
)
341 elf_sym_hashes (abfd
) = sym_hash
;
343 if (elf_elfheader (abfd
)->e_type
!= ET_DYN
)
347 /* If we are creating a shared library, create all the dynamic
348 sections immediately. We need to attach them to something,
349 so we attach them to this BFD, provided it is the right
350 format. FIXME: If there are no input BFD's of the same
351 format as the output, we can't make a shared library. */
353 && ! elf_hash_table (info
)->dynamic_sections_created
354 && abfd
->xvec
== info
->hash
->creator
)
356 if (! elf_link_create_dynamic_sections (abfd
, info
))
365 bfd_size_type oldsize
;
366 bfd_size_type strindex
;
370 /* You can't use -r against a dynamic object. Also, there's no
371 hope of using a dynamic object which does not exactly match
372 the format of the output file. */
373 if (info
->relocateable
374 || info
->hash
->creator
!= abfd
->xvec
)
376 bfd_set_error (bfd_error_invalid_operation
);
380 /* Find the name to use in a DT_NEEDED entry that refers to this
381 object. If the object has a DT_SONAME entry, we use it.
382 Otherwise, if the generic linker stuck something in
383 elf_dt_name, we use that. Otherwise, we just use the file
384 name. If the generic linker put a null string into
385 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
386 there is a DT_SONAME entry. */
388 name
= bfd_get_filename (abfd
);
389 if (elf_dt_name (abfd
) != NULL
)
391 name
= elf_dt_name (abfd
);
395 s
= bfd_get_section_by_name (abfd
, ".dynamic");
398 Elf_External_Dyn
*extdyn
;
399 Elf_External_Dyn
*extdynend
;
403 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
407 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
408 (file_ptr
) 0, s
->_raw_size
))
411 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
414 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
417 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
418 for (; extdyn
< extdynend
; extdyn
++)
420 Elf_Internal_Dyn dyn
;
422 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
423 if (dyn
.d_tag
== DT_SONAME
)
425 name
= bfd_elf_string_from_elf_section (abfd
, link
,
430 if (dyn
.d_tag
== DT_NEEDED
)
432 struct bfd_link_needed_list
*n
, **pn
;
435 n
= ((struct bfd_link_needed_list
*)
436 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
437 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
439 if (n
== NULL
|| fnm
== NULL
)
441 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
448 for (pn
= &elf_hash_table (info
)->needed
;
460 /* We do not want to include any of the sections in a dynamic
461 object in the output file. We hack by simply clobbering the
462 list of sections in the BFD. This could be handled more
463 cleanly by, say, a new section flag; the existing
464 SEC_NEVER_LOAD flag is not the one we want, because that one
465 still implies that the section takes up space in the output
467 abfd
->sections
= NULL
;
468 abfd
->section_count
= 0;
470 /* If this is the first dynamic object found in the link, create
471 the special sections required for dynamic linking. */
472 if (! elf_hash_table (info
)->dynamic_sections_created
)
474 if (! elf_link_create_dynamic_sections (abfd
, info
))
480 /* Add a DT_NEEDED entry for this dynamic object. */
481 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
482 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
484 if (strindex
== (bfd_size_type
) -1)
487 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
490 Elf_External_Dyn
*dyncon
, *dynconend
;
492 /* The hash table size did not change, which means that
493 the dynamic object name was already entered. If we
494 have already included this dynamic object in the
495 link, just ignore it. There is no reason to include
496 a particular dynamic object more than once. */
497 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
499 BFD_ASSERT (sdyn
!= NULL
);
501 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
502 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
504 for (; dyncon
< dynconend
; dyncon
++)
506 Elf_Internal_Dyn dyn
;
508 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
510 if (dyn
.d_tag
== DT_NEEDED
511 && dyn
.d_un
.d_val
== strindex
)
520 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
524 /* Save the SONAME, if there is one, because sometimes the
525 linker emulation code will need to know it. */
527 name
= bfd_get_filename (abfd
);
528 elf_dt_name (abfd
) = name
;
532 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
534 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
535 != extsymcount
* sizeof (Elf_External_Sym
)))
540 esymend
= buf
+ extsymcount
;
541 for (esym
= buf
; esym
< esymend
; esym
++, sym_hash
++)
543 Elf_Internal_Sym sym
;
549 struct elf_link_hash_entry
*h
;
551 boolean size_change_ok
, type_change_ok
;
554 elf_swap_symbol_in (abfd
, esym
, &sym
);
556 flags
= BSF_NO_FLAGS
;
558 value
= sym
.st_value
;
561 bind
= ELF_ST_BIND (sym
.st_info
);
562 if (bind
== STB_LOCAL
)
564 /* This should be impossible, since ELF requires that all
565 global symbols follow all local symbols, and that sh_info
566 point to the first global symbol. Unfortunatealy, Irix 5
570 else if (bind
== STB_GLOBAL
)
572 if (sym
.st_shndx
!= SHN_UNDEF
573 && sym
.st_shndx
!= SHN_COMMON
)
578 else if (bind
== STB_WEAK
)
582 /* Leave it up to the processor backend. */
585 if (sym
.st_shndx
== SHN_UNDEF
)
586 sec
= bfd_und_section_ptr
;
587 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
589 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
593 sec
= bfd_abs_section_ptr
;
595 else if (sym
.st_shndx
== SHN_ABS
)
596 sec
= bfd_abs_section_ptr
;
597 else if (sym
.st_shndx
== SHN_COMMON
)
599 sec
= bfd_com_section_ptr
;
600 /* What ELF calls the size we call the value. What ELF
601 calls the value we call the alignment. */
606 /* Leave it up to the processor backend. */
609 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
610 if (name
== (const char *) NULL
)
615 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
619 /* The hook function sets the name to NULL if this symbol
620 should be skipped for some reason. */
621 if (name
== (const char *) NULL
)
625 /* Sanity check that all possibilities were handled. */
626 if (sec
== (asection
*) NULL
)
628 bfd_set_error (bfd_error_bad_value
);
632 if (bfd_is_und_section (sec
)
633 || bfd_is_com_section (sec
))
638 size_change_ok
= false;
639 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
640 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
642 /* We need to look up the symbol now in order to get some of
643 the dynamic object handling right. We pass the hash
644 table entry in to _bfd_generic_link_add_one_symbol so
645 that it does not have to look it up again. */
646 if (! bfd_is_und_section (sec
))
647 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
650 h
= ((struct elf_link_hash_entry
*)
651 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
657 if (h
->root
.type
== bfd_link_hash_new
)
658 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
660 while (h
->root
.type
== bfd_link_hash_indirect
661 || h
->root
.type
== bfd_link_hash_warning
)
662 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
664 /* It's OK to change the type if it used to be a weak
666 if (h
->root
.type
== bfd_link_hash_defweak
667 || h
->root
.type
== bfd_link_hash_undefweak
)
668 type_change_ok
= true;
670 /* It's OK to change the size if it used to be a weak
671 definition, or if it used to be undefined, or if we will
672 be overriding an old definition. */
674 || h
->root
.type
== bfd_link_hash_undefined
)
675 size_change_ok
= true;
677 /* If we are looking at a dynamic object, and this is a
678 definition, we need to see if it has already been defined
679 by some other object. If it has, we want to use the
680 existing definition, and we do not want to report a
681 multiple symbol definition error; we do this by
682 clobbering sec to be bfd_und_section_ptr. */
683 if (dynamic
&& definition
)
685 if (h
->root
.type
== bfd_link_hash_defined
686 || h
->root
.type
== bfd_link_hash_defweak
687 || (h
->root
.type
== bfd_link_hash_common
688 && bind
== STB_WEAK
))
690 sec
= bfd_und_section_ptr
;
692 size_change_ok
= true;
696 /* Similarly, if we are not looking at a dynamic object, and
697 we have a definition, we want to override any definition
698 we may have from a dynamic object. Symbols from regular
699 files always take precedence over symbols from dynamic
700 objects, even if they are defined after the dynamic
701 object in the link. */
704 && (h
->root
.type
== bfd_link_hash_defined
705 || h
->root
.type
== bfd_link_hash_defweak
)
706 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
707 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
708 == bfd_target_elf_flavour
)
709 && (elf_elfheader (h
->root
.u
.def
.section
->owner
)->e_type
712 /* Change the hash table entry to undefined, and let
713 _bfd_generic_link_add_one_symbol do the right thing
714 with the new definition. */
715 h
->root
.type
= bfd_link_hash_undefined
;
716 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
717 size_change_ok
= true;
721 if (! (_bfd_generic_link_add_one_symbol
722 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
723 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
727 while (h
->root
.type
== bfd_link_hash_indirect
728 || h
->root
.type
== bfd_link_hash_warning
)
729 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
735 && (flags
& BSF_WEAK
) != 0
736 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
737 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
738 && h
->weakdef
== NULL
)
740 /* Keep a list of all weak defined non function symbols from
741 a dynamic object, using the weakdef field. Later in this
742 function we will set the weakdef field to the correct
743 value. We only put non-function symbols from dynamic
744 objects on this list, because that happens to be the only
745 time we need to know the normal symbol corresponding to a
746 weak symbol, and the information is time consuming to
747 figure out. If the weakdef field is not already NULL,
748 then this symbol was already defined by some previous
749 dynamic object, and we will be using that previous
750 definition anyhow. */
757 /* Get the alignment of a common symbol. */
758 if (sym
.st_shndx
== SHN_COMMON
759 && h
->root
.type
== bfd_link_hash_common
)
760 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
762 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
768 /* Remember the symbol size and type. */
770 && (definition
|| h
->size
== 0))
772 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
773 (*_bfd_error_handler
)
774 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
775 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
776 bfd_get_filename (abfd
));
778 h
->size
= sym
.st_size
;
780 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
781 && (definition
|| h
->type
== STT_NOTYPE
))
783 if (h
->type
!= STT_NOTYPE
784 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
786 (*_bfd_error_handler
)
787 ("Warning: type of symbol `%s' changed from %d to %d in %s",
788 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
789 bfd_get_filename (abfd
));
791 h
->type
= ELF_ST_TYPE (sym
.st_info
);
794 /* Set a flag in the hash table entry indicating the type of
795 reference or definition we just found. Keep a count of
796 the number of dynamic symbols we find. A dynamic symbol
797 is one which is referenced or defined by both a regular
798 object and a shared object, or one which is referenced or
799 defined by more than one shared object. */
800 old_flags
= h
->elf_link_hash_flags
;
805 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
807 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
809 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
810 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
816 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
818 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
819 if ((old_flags
& new_flag
) != 0
820 || (old_flags
& (ELF_LINK_HASH_DEF_REGULAR
821 | ELF_LINK_HASH_REF_REGULAR
)) != 0
822 || (h
->weakdef
!= NULL
823 && (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
824 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0))
828 h
->elf_link_hash_flags
|= new_flag
;
829 if (dynsym
&& h
->dynindx
== -1)
831 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
833 if (h
->weakdef
!= NULL
835 && h
->weakdef
->dynindx
== -1)
837 if (! _bfd_elf_link_record_dynamic_symbol (info
,
845 /* Now set the weakdefs field correctly for all the weak defined
846 symbols we found. The only way to do this is to search all the
847 symbols. Since we only need the information for non functions in
848 dynamic objects, that's the only time we actually put anything on
849 the list WEAKS. We need this information so that if a regular
850 object refers to a symbol defined weakly in a dynamic object, the
851 real symbol in the dynamic object is also put in the dynamic
852 symbols; we also must arrange for both symbols to point to the
853 same memory location. We could handle the general case of symbol
854 aliasing, but a general symbol alias can only be generated in
855 assembler code, handling it correctly would be very time
856 consuming, and other ELF linkers don't handle general aliasing
858 while (weaks
!= NULL
)
860 struct elf_link_hash_entry
*hlook
;
863 struct elf_link_hash_entry
**hpp
;
864 struct elf_link_hash_entry
**hppend
;
867 weaks
= hlook
->weakdef
;
868 hlook
->weakdef
= NULL
;
870 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
871 || hlook
->root
.type
== bfd_link_hash_defweak
872 || hlook
->root
.type
== bfd_link_hash_common
873 || hlook
->root
.type
== bfd_link_hash_indirect
);
874 slook
= hlook
->root
.u
.def
.section
;
875 vlook
= hlook
->root
.u
.def
.value
;
877 hpp
= elf_sym_hashes (abfd
);
878 hppend
= hpp
+ extsymcount
;
879 for (; hpp
< hppend
; hpp
++)
881 struct elf_link_hash_entry
*h
;
884 if (h
!= NULL
&& h
!= hlook
885 && h
->root
.type
== bfd_link_hash_defined
886 && h
->root
.u
.def
.section
== slook
887 && h
->root
.u
.def
.value
== vlook
)
891 /* If the weak definition is in the list of dynamic
892 symbols, make sure the real definition is put there
894 if (hlook
->dynindx
!= -1
897 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
912 /* If this object is the same format as the output object, and it is
913 not a shared library, then let the backend look through the
916 This is required to build global offset table entries and to
917 arrange for dynamic relocs. It is not required for the
918 particular common case of linking non PIC code, even when linking
919 against shared libraries, but unfortunately there is no way of
920 knowing whether an object file has been compiled PIC or not.
921 Looking through the relocs is not particularly time consuming.
922 The problem is that we must either (1) keep the relocs in memory,
923 which causes the linker to require additional runtime memory or
924 (2) read the relocs twice from the input file, which wastes time.
925 This would be a good case for using mmap.
927 I have no idea how to handle linking PIC code into a file of a
928 different format. It probably can't be done. */
929 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
931 && abfd
->xvec
== info
->hash
->creator
932 && check_relocs
!= NULL
)
936 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
938 Elf_Internal_Rela
*internal_relocs
;
941 if ((o
->flags
& SEC_RELOC
) == 0
942 || o
->reloc_count
== 0)
945 /* I believe we can ignore the relocs for any section which
946 does not form part of the final process image, such as a
947 debugging section. */
948 if ((o
->flags
& SEC_ALLOC
) == 0)
951 internal_relocs
= elf_link_read_relocs (abfd
, o
, (PTR
) NULL
,
952 (Elf_Internal_Rela
*) NULL
,
954 if (internal_relocs
== NULL
)
957 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
959 if (! info
->keep_memory
)
960 free (internal_relocs
);
967 /* If this is a non-traditional, non-relocateable link, try to
968 optimize the handling of the .stab/.stabstr sections. */
970 && ! info
->relocateable
971 && ! info
->traditional_format
972 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
973 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
975 asection
*stab
, *stabstr
;
977 stab
= bfd_get_section_by_name (abfd
, ".stab");
980 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
984 struct bfd_elf_section_data
*secdata
;
986 secdata
= elf_section_data (stab
);
987 if (! _bfd_link_section_stabs (abfd
,
988 &elf_hash_table (info
)->stab_info
,
990 &secdata
->stab_info
))
1006 /* Create some sections which will be filled in with dynamic linking
1007 information. ABFD is an input file which requires dynamic sections
1008 to be created. The dynamic sections take up virtual memory space
1009 when the final executable is run, so we need to create them before
1010 addresses are assigned to the output sections. We work out the
1011 actual contents and size of these sections later. */
1014 elf_link_create_dynamic_sections (abfd
, info
)
1016 struct bfd_link_info
*info
;
1019 register asection
*s
;
1020 struct elf_link_hash_entry
*h
;
1021 struct elf_backend_data
*bed
;
1023 if (elf_hash_table (info
)->dynamic_sections_created
)
1026 /* Make sure that all dynamic sections use the same input BFD. */
1027 if (elf_hash_table (info
)->dynobj
== NULL
)
1028 elf_hash_table (info
)->dynobj
= abfd
;
1030 abfd
= elf_hash_table (info
)->dynobj
;
1032 /* Note that we set the SEC_IN_MEMORY flag for all of these
1034 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
;
1036 /* A dynamically linked executable has a .interp section, but a
1037 shared library does not. */
1040 s
= bfd_make_section (abfd
, ".interp");
1042 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1046 s
= bfd_make_section (abfd
, ".dynsym");
1048 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1049 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1052 s
= bfd_make_section (abfd
, ".dynstr");
1054 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1057 /* Create a strtab to hold the dynamic symbol names. */
1058 if (elf_hash_table (info
)->dynstr
== NULL
)
1060 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1061 if (elf_hash_table (info
)->dynstr
== NULL
)
1065 s
= bfd_make_section (abfd
, ".dynamic");
1067 || ! bfd_set_section_flags (abfd
, s
, flags
)
1068 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1071 /* The special symbol _DYNAMIC is always set to the start of the
1072 .dynamic section. This call occurs before we have processed the
1073 symbols for any dynamic object, so we don't have to worry about
1074 overriding a dynamic definition. We could set _DYNAMIC in a
1075 linker script, but we only want to define it if we are, in fact,
1076 creating a .dynamic section. We don't want to define it if there
1077 is no .dynamic section, since on some ELF platforms the start up
1078 code examines it to decide how to initialize the process. */
1080 if (! (_bfd_generic_link_add_one_symbol
1081 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1082 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1083 (struct bfd_link_hash_entry
**) &h
)))
1085 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1086 h
->type
= STT_OBJECT
;
1089 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1092 s
= bfd_make_section (abfd
, ".hash");
1094 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1095 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1098 /* Let the backend create the rest of the sections. This lets the
1099 backend set the right flags. The backend will normally create
1100 the .got and .plt sections. */
1101 bed
= get_elf_backend_data (abfd
);
1102 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1105 elf_hash_table (info
)->dynamic_sections_created
= true;
1110 /* Add an entry to the .dynamic table. */
1113 elf_add_dynamic_entry (info
, tag
, val
)
1114 struct bfd_link_info
*info
;
1118 Elf_Internal_Dyn dyn
;
1122 bfd_byte
*newcontents
;
1124 dynobj
= elf_hash_table (info
)->dynobj
;
1126 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1127 BFD_ASSERT (s
!= NULL
);
1129 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1130 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1131 if (newcontents
== NULL
)
1135 dyn
.d_un
.d_val
= val
;
1136 elf_swap_dyn_out (dynobj
, &dyn
,
1137 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1139 s
->_raw_size
= newsize
;
1140 s
->contents
= newcontents
;
1146 /* Read and swap the relocs for a section. They may have been cached.
1147 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1148 they are used as buffers to read into. They are known to be large
1149 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1150 value is allocated using either malloc or bfd_alloc, according to
1151 the KEEP_MEMORY argument. */
1153 static Elf_Internal_Rela
*
1154 elf_link_read_relocs (abfd
, o
, external_relocs
, internal_relocs
, keep_memory
)
1157 PTR external_relocs
;
1158 Elf_Internal_Rela
*internal_relocs
;
1159 boolean keep_memory
;
1161 Elf_Internal_Shdr
*rel_hdr
;
1163 Elf_Internal_Rela
*alloc2
= NULL
;
1165 if (elf_section_data (o
)->relocs
!= NULL
)
1166 return elf_section_data (o
)->relocs
;
1168 if (o
->reloc_count
== 0)
1171 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1173 if (internal_relocs
== NULL
)
1177 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1179 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1181 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1182 if (internal_relocs
== NULL
)
1186 if (external_relocs
== NULL
)
1188 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1191 external_relocs
= alloc1
;
1194 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1195 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1196 != rel_hdr
->sh_size
))
1199 /* Swap in the relocs. For convenience, we always produce an
1200 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1202 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1204 Elf_External_Rel
*erel
;
1205 Elf_External_Rel
*erelend
;
1206 Elf_Internal_Rela
*irela
;
1208 erel
= (Elf_External_Rel
*) external_relocs
;
1209 erelend
= erel
+ o
->reloc_count
;
1210 irela
= internal_relocs
;
1211 for (; erel
< erelend
; erel
++, irela
++)
1213 Elf_Internal_Rel irel
;
1215 elf_swap_reloc_in (abfd
, erel
, &irel
);
1216 irela
->r_offset
= irel
.r_offset
;
1217 irela
->r_info
= irel
.r_info
;
1218 irela
->r_addend
= 0;
1223 Elf_External_Rela
*erela
;
1224 Elf_External_Rela
*erelaend
;
1225 Elf_Internal_Rela
*irela
;
1227 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1229 erela
= (Elf_External_Rela
*) external_relocs
;
1230 erelaend
= erela
+ o
->reloc_count
;
1231 irela
= internal_relocs
;
1232 for (; erela
< erelaend
; erela
++, irela
++)
1233 elf_swap_reloca_in (abfd
, erela
, irela
);
1236 /* Cache the results for next time, if we can. */
1238 elf_section_data (o
)->relocs
= internal_relocs
;
1243 /* Don't free alloc2, since if it was allocated we are passing it
1244 back (under the name of internal_relocs). */
1246 return internal_relocs
;
1257 /* Record an assignment to a symbol made by a linker script. We need
1258 this in case some dynamic object refers to this symbol. */
1262 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1264 struct bfd_link_info
*info
;
1268 struct elf_link_hash_entry
*h
;
1270 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1273 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1277 if (h
->root
.type
== bfd_link_hash_new
)
1278 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1280 /* If this symbol is being provided by the linker script, and it is
1281 currently defined by a dynamic object, but not by a regular
1282 object, then mark it as undefined so that the generic linker will
1283 force the correct value. */
1285 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1286 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1287 h
->root
.type
= bfd_link_hash_undefined
;
1289 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1290 h
->type
= STT_OBJECT
;
1292 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1293 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1295 && h
->dynindx
== -1)
1297 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1300 /* If this is a weak defined symbol, and we know a corresponding
1301 real symbol from the same dynamic object, make sure the real
1302 symbol is also made into a dynamic symbol. */
1303 if (h
->weakdef
!= NULL
1304 && h
->weakdef
->dynindx
== -1)
1306 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1315 /* Array used to determine the number of hash table buckets to use
1316 based on the number of symbols there are. If there are fewer than
1317 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1318 fewer than 37 we use 17 buckets, and so forth. We never use more
1319 than 521 buckets. */
1321 static const size_t elf_buckets
[] =
1323 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1326 /* Set up the sizes and contents of the ELF dynamic sections. This is
1327 called by the ELF linker emulation before_allocation routine. We
1328 must set the sizes of the sections before the linker sets the
1329 addresses of the various sections. */
1332 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1333 export_dynamic
, info
, sinterpptr
)
1337 boolean export_dynamic
;
1338 struct bfd_link_info
*info
;
1339 asection
**sinterpptr
;
1342 struct elf_backend_data
*bed
;
1346 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1349 dynobj
= elf_hash_table (info
)->dynobj
;
1351 /* If there were no dynamic objects in the link, there is nothing to
1356 /* If we are supposed to export all symbols into the dynamic symbol
1357 table (this is not the normal case), then do so. */
1360 struct elf_info_failed eif
;
1364 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1370 if (elf_hash_table (info
)->dynamic_sections_created
)
1372 struct elf_info_failed eif
;
1373 struct elf_link_hash_entry
*h
;
1374 bfd_size_type strsize
;
1376 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
1377 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
1383 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, soname
,
1385 if (indx
== (bfd_size_type
) -1
1386 || ! elf_add_dynamic_entry (info
, DT_SONAME
, indx
))
1392 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
1400 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
1402 if (indx
== (bfd_size_type
) -1
1403 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
1407 /* Find all symbols which were defined in a dynamic object and make
1408 the backend pick a reasonable value for them. */
1411 elf_link_hash_traverse (elf_hash_table (info
),
1412 elf_adjust_dynamic_symbol
,
1417 /* Add some entries to the .dynamic section. We fill in some of the
1418 values later, in elf_bfd_final_link, but we must add the entries
1419 now so that we know the final size of the .dynamic section. */
1420 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
1423 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1424 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1426 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
1429 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
1432 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1433 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1435 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
1438 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1439 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
1440 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
1441 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
1442 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
1443 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
1444 sizeof (Elf_External_Sym
)))
1448 /* The backend must work out the sizes of all the other dynamic
1450 bed
= get_elf_backend_data (output_bfd
);
1451 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
1454 if (elf_hash_table (info
)->dynamic_sections_created
)
1459 size_t bucketcount
= 0;
1460 Elf_Internal_Sym isym
;
1462 /* Set the size of the .dynsym and .hash sections. We counted
1463 the number of dynamic symbols in elf_link_add_object_symbols.
1464 We will build the contents of .dynsym and .hash when we build
1465 the final symbol table, because until then we do not know the
1466 correct value to give the symbols. We built the .dynstr
1467 section as we went along in elf_link_add_object_symbols. */
1468 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
1469 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
1470 BFD_ASSERT (s
!= NULL
);
1471 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
1472 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1473 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1476 /* The first entry in .dynsym is a dummy symbol. */
1483 elf_swap_symbol_out (output_bfd
, &isym
,
1484 (PTR
) (Elf_External_Sym
*) s
->contents
);
1486 for (i
= 0; elf_buckets
[i
] != 0; i
++)
1488 bucketcount
= elf_buckets
[i
];
1489 if (dynsymcount
< elf_buckets
[i
+ 1])
1493 s
= bfd_get_section_by_name (dynobj
, ".hash");
1494 BFD_ASSERT (s
!= NULL
);
1495 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
1496 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1497 if (s
->contents
== NULL
)
1499 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
1501 put_word (output_bfd
, bucketcount
, s
->contents
);
1502 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
1504 elf_hash_table (info
)->bucketcount
= bucketcount
;
1506 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
1507 BFD_ASSERT (s
!= NULL
);
1508 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1510 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
1518 /* This routine is used to export all defined symbols into the dynamic
1519 symbol table. It is called via elf_link_hash_traverse. */
1522 elf_export_symbol (h
, data
)
1523 struct elf_link_hash_entry
*h
;
1526 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1528 if (h
->dynindx
== -1
1529 && (h
->elf_link_hash_flags
1530 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1532 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1543 /* Make the backend pick a good value for a dynamic symbol. This is
1544 called via elf_link_hash_traverse, and also calls itself
1548 elf_adjust_dynamic_symbol (h
, data
)
1549 struct elf_link_hash_entry
*h
;
1552 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1554 struct elf_backend_data
*bed
;
1556 /* If this symbol was mentioned in a non-ELF file, try to set
1557 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1558 permit a non-ELF file to correctly refer to a symbol defined in
1559 an ELF dynamic object. */
1560 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
1562 if (h
->root
.type
!= bfd_link_hash_defined
1563 && h
->root
.type
!= bfd_link_hash_defweak
)
1564 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1567 if (h
->root
.u
.def
.section
->owner
!= NULL
1568 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
1569 == bfd_target_elf_flavour
))
1570 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1572 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1575 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1576 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
1578 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1586 /* If this is a final link, and the symbol was defined as a common
1587 symbol in a regular object file, and there was no definition in
1588 any dynamic object, then the linker will have allocated space for
1589 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1590 flag will not have been set. */
1591 if (h
->root
.type
== bfd_link_hash_defined
1592 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1593 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
1594 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1595 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
1596 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1598 /* If -Bsymbolic was used (which means to bind references to global
1599 symbols to the definition within the shared object), and this
1600 symbol was defined in a regular object, then it actually doesn't
1601 need a PLT entry. */
1602 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
1603 && eif
->info
->shared
1604 && eif
->info
->symbolic
1605 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1606 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
1608 /* If this symbol does not require a PLT entry, and it is not
1609 defined by a dynamic object, or is not referenced by a regular
1610 object, ignore it. We do have to handle a weak defined symbol,
1611 even if no regular object refers to it, if we decided to add it
1612 to the dynamic symbol table. FIXME: Do we normally need to worry
1613 about symbols which are defined by one dynamic object and
1614 referenced by another one? */
1615 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
1616 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1617 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1618 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
1619 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
1622 /* If we've already adjusted this symbol, don't do it again. This
1623 can happen via a recursive call. */
1624 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
1627 /* Don't look at this symbol again. Note that we must set this
1628 after checking the above conditions, because we may look at a
1629 symbol once, decide not to do anything, and then get called
1630 recursively later after REF_REGULAR is set below. */
1631 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
1633 /* If this is a weak definition, and we know a real definition, and
1634 the real symbol is not itself defined by a regular object file,
1635 then get a good value for the real definition. We handle the
1636 real symbol first, for the convenience of the backend routine.
1638 Note that there is a confusing case here. If the real definition
1639 is defined by a regular object file, we don't get the real symbol
1640 from the dynamic object, but we do get the weak symbol. If the
1641 processor backend uses a COPY reloc, then if some routine in the
1642 dynamic object changes the real symbol, we will not see that
1643 change in the corresponding weak symbol. This is the way other
1644 ELF linkers work as well, and seems to be a result of the shared
1647 I will clarify this issue. Most SVR4 shared libraries define the
1648 variable _timezone and define timezone as a weak synonym. The
1649 tzset call changes _timezone. If you write
1650 extern int timezone;
1652 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1653 you might expect that, since timezone is a synonym for _timezone,
1654 the same number will print both times. However, if the processor
1655 backend uses a COPY reloc, then actually timezone will be copied
1656 into your process image, and, since you define _timezone
1657 yourself, _timezone will not. Thus timezone and _timezone will
1658 wind up at different memory locations. The tzset call will set
1659 _timezone, leaving timezone unchanged. */
1661 if (h
->weakdef
!= NULL
)
1663 struct elf_link_hash_entry
*weakdef
;
1665 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
1666 || h
->root
.type
== bfd_link_hash_defweak
);
1667 weakdef
= h
->weakdef
;
1668 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
1669 || weakdef
->root
.type
== bfd_link_hash_defweak
);
1670 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
1671 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1673 /* This symbol is defined by a regular object file, so we
1674 will not do anything special. Clear weakdef for the
1675 convenience of the processor backend. */
1680 /* There is an implicit reference by a regular object file
1681 via the weak symbol. */
1682 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1683 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
1688 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
1689 bed
= get_elf_backend_data (dynobj
);
1690 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
1699 /* Final phase of ELF linker. */
1701 /* A structure we use to avoid passing large numbers of arguments. */
1703 struct elf_final_link_info
1705 /* General link information. */
1706 struct bfd_link_info
*info
;
1709 /* Symbol string table. */
1710 struct bfd_strtab_hash
*symstrtab
;
1711 /* .dynsym section. */
1712 asection
*dynsym_sec
;
1713 /* .hash section. */
1715 /* Buffer large enough to hold contents of any section. */
1717 /* Buffer large enough to hold external relocs of any section. */
1718 PTR external_relocs
;
1719 /* Buffer large enough to hold internal relocs of any section. */
1720 Elf_Internal_Rela
*internal_relocs
;
1721 /* Buffer large enough to hold external local symbols of any input
1723 Elf_External_Sym
*external_syms
;
1724 /* Buffer large enough to hold internal local symbols of any input
1726 Elf_Internal_Sym
*internal_syms
;
1727 /* Array large enough to hold a symbol index for each local symbol
1728 of any input BFD. */
1730 /* Array large enough to hold a section pointer for each local
1731 symbol of any input BFD. */
1732 asection
**sections
;
1733 /* Buffer to hold swapped out symbols. */
1734 Elf_External_Sym
*symbuf
;
1735 /* Number of swapped out symbols in buffer. */
1736 size_t symbuf_count
;
1737 /* Number of symbols which fit in symbuf. */
1741 static boolean elf_link_output_sym
1742 PARAMS ((struct elf_final_link_info
*, const char *,
1743 Elf_Internal_Sym
*, asection
*));
1744 static boolean elf_link_flush_output_syms
1745 PARAMS ((struct elf_final_link_info
*));
1746 static boolean elf_link_output_extsym
1747 PARAMS ((struct elf_link_hash_entry
*, PTR
));
1748 static boolean elf_link_input_bfd
1749 PARAMS ((struct elf_final_link_info
*, bfd
*));
1750 static boolean elf_reloc_link_order
1751 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1752 struct bfd_link_order
*));
1754 /* This struct is used to pass information to routines called via
1755 elf_link_hash_traverse which must return failure. */
1757 struct elf_finfo_failed
1760 struct elf_final_link_info
*finfo
;
1763 /* Do the final step of an ELF link. */
1766 elf_bfd_final_link (abfd
, info
)
1768 struct bfd_link_info
*info
;
1772 struct elf_final_link_info finfo
;
1773 register asection
*o
;
1774 register struct bfd_link_order
*p
;
1776 size_t max_contents_size
;
1777 size_t max_external_reloc_size
;
1778 size_t max_internal_reloc_count
;
1779 size_t max_sym_count
;
1781 Elf_Internal_Sym elfsym
;
1783 Elf_Internal_Shdr
*symtab_hdr
;
1784 Elf_Internal_Shdr
*symstrtab_hdr
;
1785 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1786 struct elf_finfo_failed eif
;
1789 abfd
->flags
|= DYNAMIC
;
1791 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
1792 dynobj
= elf_hash_table (info
)->dynobj
;
1795 finfo
.output_bfd
= abfd
;
1796 finfo
.symstrtab
= elf_stringtab_init ();
1797 if (finfo
.symstrtab
== NULL
)
1801 finfo
.dynsym_sec
= NULL
;
1802 finfo
.hash_sec
= NULL
;
1806 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
1807 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
1808 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
1810 finfo
.contents
= NULL
;
1811 finfo
.external_relocs
= NULL
;
1812 finfo
.internal_relocs
= NULL
;
1813 finfo
.external_syms
= NULL
;
1814 finfo
.internal_syms
= NULL
;
1815 finfo
.indices
= NULL
;
1816 finfo
.sections
= NULL
;
1817 finfo
.symbuf
= NULL
;
1818 finfo
.symbuf_count
= 0;
1820 /* Count up the number of relocations we will output for each output
1821 section, so that we know the sizes of the reloc sections. We
1822 also figure out some maximum sizes. */
1823 max_contents_size
= 0;
1824 max_external_reloc_size
= 0;
1825 max_internal_reloc_count
= 0;
1827 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
1831 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1833 if (p
->type
== bfd_section_reloc_link_order
1834 || p
->type
== bfd_symbol_reloc_link_order
)
1836 else if (p
->type
== bfd_indirect_link_order
)
1840 sec
= p
->u
.indirect
.section
;
1842 /* Mark all sections which are to be included in the
1843 link. This will normally be every section. We need
1844 to do this so that we can identify any sections which
1845 the linker has decided to not include. */
1846 sec
->linker_mark
= true;
1848 if (info
->relocateable
)
1849 o
->reloc_count
+= sec
->reloc_count
;
1851 if (sec
->_raw_size
> max_contents_size
)
1852 max_contents_size
= sec
->_raw_size
;
1853 if (sec
->_cooked_size
> max_contents_size
)
1854 max_contents_size
= sec
->_cooked_size
;
1856 /* We are interested in just local symbols, not all
1858 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
)
1862 if (elf_bad_symtab (sec
->owner
))
1863 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
1864 / sizeof (Elf_External_Sym
));
1866 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
1868 if (sym_count
> max_sym_count
)
1869 max_sym_count
= sym_count
;
1871 if ((sec
->flags
& SEC_RELOC
) != 0)
1875 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
1876 if (ext_size
> max_external_reloc_size
)
1877 max_external_reloc_size
= ext_size
;
1878 if (sec
->reloc_count
> max_internal_reloc_count
)
1879 max_internal_reloc_count
= sec
->reloc_count
;
1885 if (o
->reloc_count
> 0)
1886 o
->flags
|= SEC_RELOC
;
1889 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1890 set it (this is probably a bug) and if it is set
1891 assign_section_numbers will create a reloc section. */
1892 o
->flags
&=~ SEC_RELOC
;
1895 /* If the SEC_ALLOC flag is not set, force the section VMA to
1896 zero. This is done in elf_fake_sections as well, but forcing
1897 the VMA to 0 here will ensure that relocs against these
1898 sections are handled correctly. */
1899 if ((o
->flags
& SEC_ALLOC
) == 0)
1903 /* Figure out the file positions for everything but the symbol table
1904 and the relocs. We set symcount to force assign_section_numbers
1905 to create a symbol table. */
1906 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
1907 BFD_ASSERT (! abfd
->output_has_begun
);
1908 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
1911 /* That created the reloc sections. Set their sizes, and assign
1912 them file positions, and allocate some buffers. */
1913 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1915 if ((o
->flags
& SEC_RELOC
) != 0)
1917 Elf_Internal_Shdr
*rel_hdr
;
1918 register struct elf_link_hash_entry
**p
, **pend
;
1920 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1922 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
1924 /* The contents field must last into write_object_contents,
1925 so we allocate it with bfd_alloc rather than malloc. */
1926 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
1927 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1930 p
= ((struct elf_link_hash_entry
**)
1931 bfd_malloc (o
->reloc_count
1932 * sizeof (struct elf_link_hash_entry
*)));
1933 if (p
== NULL
&& o
->reloc_count
!= 0)
1935 elf_section_data (o
)->rel_hashes
= p
;
1936 pend
= p
+ o
->reloc_count
;
1937 for (; p
< pend
; p
++)
1940 /* Use the reloc_count field as an index when outputting the
1946 _bfd_elf_assign_file_positions_for_relocs (abfd
);
1948 /* We have now assigned file positions for all the sections except
1949 .symtab and .strtab. We start the .symtab section at the current
1950 file position, and write directly to it. We build the .strtab
1951 section in memory. */
1953 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1954 /* sh_name is set in prep_headers. */
1955 symtab_hdr
->sh_type
= SHT_SYMTAB
;
1956 symtab_hdr
->sh_flags
= 0;
1957 symtab_hdr
->sh_addr
= 0;
1958 symtab_hdr
->sh_size
= 0;
1959 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
1960 /* sh_link is set in assign_section_numbers. */
1961 /* sh_info is set below. */
1962 /* sh_offset is set just below. */
1963 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
1965 off
= elf_tdata (abfd
)->next_file_pos
;
1966 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
1968 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1969 incorrect. We do not yet know the size of the .symtab section.
1970 We correct next_file_pos below, after we do know the size. */
1972 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1973 continuously seeking to the right position in the file. */
1974 if (! info
->keep_memory
|| max_sym_count
< 20)
1975 finfo
.symbuf_size
= 20;
1977 finfo
.symbuf_size
= max_sym_count
;
1978 finfo
.symbuf
= ((Elf_External_Sym
*)
1979 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
1980 if (finfo
.symbuf
== NULL
)
1983 /* Start writing out the symbol table. The first symbol is always a
1985 if (info
->strip
!= strip_all
|| info
->relocateable
)
1987 elfsym
.st_value
= 0;
1990 elfsym
.st_other
= 0;
1991 elfsym
.st_shndx
= SHN_UNDEF
;
1992 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
1993 &elfsym
, bfd_und_section_ptr
))
1998 /* Some standard ELF linkers do this, but we don't because it causes
1999 bootstrap comparison failures. */
2000 /* Output a file symbol for the output file as the second symbol.
2001 We output this even if we are discarding local symbols, although
2002 I'm not sure if this is correct. */
2003 elfsym
.st_value
= 0;
2005 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
2006 elfsym
.st_other
= 0;
2007 elfsym
.st_shndx
= SHN_ABS
;
2008 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
2009 &elfsym
, bfd_abs_section_ptr
))
2013 /* Output a symbol for each section. We output these even if we are
2014 discarding local symbols, since they are used for relocs. These
2015 symbols have no names. We store the index of each one in the
2016 index field of the section, so that we can find it again when
2017 outputting relocs. */
2018 if (info
->strip
!= strip_all
|| info
->relocateable
)
2020 elfsym
.st_value
= 0;
2022 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
2023 elfsym
.st_other
= 0;
2024 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2026 o
= section_from_elf_index (abfd
, i
);
2028 o
->target_index
= abfd
->symcount
;
2029 elfsym
.st_shndx
= i
;
2030 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2036 /* Allocate some memory to hold information read in from the input
2038 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
2039 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
2040 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
2041 bfd_malloc (max_internal_reloc_count
2042 * sizeof (Elf_Internal_Rela
)));
2043 finfo
.external_syms
= ((Elf_External_Sym
*)
2044 bfd_malloc (max_sym_count
2045 * sizeof (Elf_External_Sym
)));
2046 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
2047 bfd_malloc (max_sym_count
2048 * sizeof (Elf_Internal_Sym
)));
2049 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
2050 finfo
.sections
= ((asection
**)
2051 bfd_malloc (max_sym_count
* sizeof (asection
*)));
2052 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
2053 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
2054 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
2055 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
2056 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
2057 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
2058 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
2061 /* Since ELF permits relocations to be against local symbols, we
2062 must have the local symbols available when we do the relocations.
2063 Since we would rather only read the local symbols once, and we
2064 would rather not keep them in memory, we handle all the
2065 relocations for a single input file at the same time.
2067 Unfortunately, there is no way to know the total number of local
2068 symbols until we have seen all of them, and the local symbol
2069 indices precede the global symbol indices. This means that when
2070 we are generating relocateable output, and we see a reloc against
2071 a global symbol, we can not know the symbol index until we have
2072 finished examining all the local symbols to see which ones we are
2073 going to output. To deal with this, we keep the relocations in
2074 memory, and don't output them until the end of the link. This is
2075 an unfortunate waste of memory, but I don't see a good way around
2076 it. Fortunately, it only happens when performing a relocateable
2077 link, which is not the common case. FIXME: If keep_memory is set
2078 we could write the relocs out and then read them again; I don't
2079 know how bad the memory loss will be. */
2081 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
2082 sub
->output_has_begun
= false;
2083 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2085 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
2087 if (p
->type
== bfd_indirect_link_order
2088 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
2089 == bfd_target_elf_flavour
))
2091 sub
= p
->u
.indirect
.section
->owner
;
2092 if (! sub
->output_has_begun
)
2094 if (! elf_link_input_bfd (&finfo
, sub
))
2096 sub
->output_has_begun
= true;
2099 else if (p
->type
== bfd_section_reloc_link_order
2100 || p
->type
== bfd_symbol_reloc_link_order
)
2102 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
2107 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
2113 /* That wrote out all the local symbols. Finish up the symbol table
2114 with the global symbols. */
2116 /* The sh_info field records the index of the first non local
2118 symtab_hdr
->sh_info
= abfd
->symcount
;
2120 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
2122 /* We get the global symbols from the hash table. */
2125 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
2130 /* Flush all symbols to the file. */
2131 if (! elf_link_flush_output_syms (&finfo
))
2134 /* Now we know the size of the symtab section. */
2135 off
+= symtab_hdr
->sh_size
;
2137 /* Finish up and write out the symbol string table (.strtab)
2139 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
2140 /* sh_name was set in prep_headers. */
2141 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
2142 symstrtab_hdr
->sh_flags
= 0;
2143 symstrtab_hdr
->sh_addr
= 0;
2144 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
2145 symstrtab_hdr
->sh_entsize
= 0;
2146 symstrtab_hdr
->sh_link
= 0;
2147 symstrtab_hdr
->sh_info
= 0;
2148 /* sh_offset is set just below. */
2149 symstrtab_hdr
->sh_addralign
= 1;
2151 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
2152 elf_tdata (abfd
)->next_file_pos
= off
;
2154 if (abfd
->symcount
> 0)
2156 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
2157 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
2161 /* Adjust the relocs to have the correct symbol indices. */
2162 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2164 struct elf_link_hash_entry
**rel_hash
;
2165 Elf_Internal_Shdr
*rel_hdr
;
2167 if ((o
->flags
& SEC_RELOC
) == 0)
2170 rel_hash
= elf_section_data (o
)->rel_hashes
;
2171 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2172 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
2174 if (*rel_hash
== NULL
)
2177 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
2179 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2181 Elf_External_Rel
*erel
;
2182 Elf_Internal_Rel irel
;
2184 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
2185 elf_swap_reloc_in (abfd
, erel
, &irel
);
2186 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2187 ELF_R_TYPE (irel
.r_info
));
2188 elf_swap_reloc_out (abfd
, &irel
, erel
);
2192 Elf_External_Rela
*erela
;
2193 Elf_Internal_Rela irela
;
2195 BFD_ASSERT (rel_hdr
->sh_entsize
2196 == sizeof (Elf_External_Rela
));
2198 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
2199 elf_swap_reloca_in (abfd
, erela
, &irela
);
2200 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2201 ELF_R_TYPE (irela
.r_info
));
2202 elf_swap_reloca_out (abfd
, &irela
, erela
);
2206 /* Set the reloc_count field to 0 to prevent write_relocs from
2207 trying to swap the relocs out itself. */
2211 /* If we are linking against a dynamic object, or generating a
2212 shared library, finish up the dynamic linking information. */
2215 Elf_External_Dyn
*dyncon
, *dynconend
;
2217 /* Fix up .dynamic entries. */
2218 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
2219 BFD_ASSERT (o
!= NULL
);
2221 dyncon
= (Elf_External_Dyn
*) o
->contents
;
2222 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
2223 for (; dyncon
< dynconend
; dyncon
++)
2225 Elf_Internal_Dyn dyn
;
2229 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2236 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2237 magic _init and _fini symbols. This is pretty ugly,
2238 but we are compatible. */
2246 struct elf_link_hash_entry
*h
;
2248 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
2249 false, false, true);
2251 && (h
->root
.type
== bfd_link_hash_defined
2252 || h
->root
.type
== bfd_link_hash_defweak
))
2254 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
2255 o
= h
->root
.u
.def
.section
;
2256 if (o
->output_section
!= NULL
)
2257 dyn
.d_un
.d_val
+= (o
->output_section
->vma
2258 + o
->output_offset
);
2261 /* The symbol is imported from another shared
2262 library and does not apply to this one. */
2266 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2280 o
= bfd_get_section_by_name (abfd
, name
);
2281 BFD_ASSERT (o
!= NULL
);
2282 dyn
.d_un
.d_ptr
= o
->vma
;
2283 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2290 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
2295 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2297 Elf_Internal_Shdr
*hdr
;
2299 hdr
= elf_elfsections (abfd
)[i
];
2300 if (hdr
->sh_type
== type
2301 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
2303 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
2304 dyn
.d_un
.d_val
+= hdr
->sh_size
;
2307 if (dyn
.d_un
.d_val
== 0
2308 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
2309 dyn
.d_un
.d_val
= hdr
->sh_addr
;
2313 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2319 /* If we have created any dynamic sections, then output them. */
2322 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
2325 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
2327 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2328 || o
->_raw_size
== 0)
2330 if ((o
->flags
& SEC_IN_MEMORY
) == 0)
2332 /* At this point, we are only interested in sections
2333 created by elf_link_create_dynamic_sections. FIXME:
2334 This test is fragile. */
2337 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
2339 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
2341 if (! bfd_set_section_contents (abfd
, o
->output_section
,
2342 o
->contents
, o
->output_offset
,
2350 /* The contents of the .dynstr section are actually in a
2352 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
2353 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
2354 || ! _bfd_stringtab_emit (abfd
,
2355 elf_hash_table (info
)->dynstr
))
2361 /* If we have optimized stabs strings, output them. */
2362 if (elf_hash_table (info
)->stab_info
!= NULL
)
2364 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
2368 if (finfo
.symstrtab
!= NULL
)
2369 _bfd_stringtab_free (finfo
.symstrtab
);
2370 if (finfo
.contents
!= NULL
)
2371 free (finfo
.contents
);
2372 if (finfo
.external_relocs
!= NULL
)
2373 free (finfo
.external_relocs
);
2374 if (finfo
.internal_relocs
!= NULL
)
2375 free (finfo
.internal_relocs
);
2376 if (finfo
.external_syms
!= NULL
)
2377 free (finfo
.external_syms
);
2378 if (finfo
.internal_syms
!= NULL
)
2379 free (finfo
.internal_syms
);
2380 if (finfo
.indices
!= NULL
)
2381 free (finfo
.indices
);
2382 if (finfo
.sections
!= NULL
)
2383 free (finfo
.sections
);
2384 if (finfo
.symbuf
!= NULL
)
2385 free (finfo
.symbuf
);
2386 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2388 if ((o
->flags
& SEC_RELOC
) != 0
2389 && elf_section_data (o
)->rel_hashes
!= NULL
)
2390 free (elf_section_data (o
)->rel_hashes
);
2393 elf_tdata (abfd
)->linker
= true;
2398 if (finfo
.symstrtab
!= NULL
)
2399 _bfd_stringtab_free (finfo
.symstrtab
);
2400 if (finfo
.contents
!= NULL
)
2401 free (finfo
.contents
);
2402 if (finfo
.external_relocs
!= NULL
)
2403 free (finfo
.external_relocs
);
2404 if (finfo
.internal_relocs
!= NULL
)
2405 free (finfo
.internal_relocs
);
2406 if (finfo
.external_syms
!= NULL
)
2407 free (finfo
.external_syms
);
2408 if (finfo
.internal_syms
!= NULL
)
2409 free (finfo
.internal_syms
);
2410 if (finfo
.indices
!= NULL
)
2411 free (finfo
.indices
);
2412 if (finfo
.sections
!= NULL
)
2413 free (finfo
.sections
);
2414 if (finfo
.symbuf
!= NULL
)
2415 free (finfo
.symbuf
);
2416 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2418 if ((o
->flags
& SEC_RELOC
) != 0
2419 && elf_section_data (o
)->rel_hashes
!= NULL
)
2420 free (elf_section_data (o
)->rel_hashes
);
2426 /* Add a symbol to the output symbol table. */
2429 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
2430 struct elf_final_link_info
*finfo
;
2432 Elf_Internal_Sym
*elfsym
;
2433 asection
*input_sec
;
2435 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
2436 struct bfd_link_info
*info
,
2441 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
2442 elf_backend_link_output_symbol_hook
;
2443 if (output_symbol_hook
!= NULL
)
2445 if (! ((*output_symbol_hook
)
2446 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
2450 if (name
== (const char *) NULL
|| *name
== '\0')
2451 elfsym
->st_name
= 0;
2454 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
2457 if (elfsym
->st_name
== (unsigned long) -1)
2461 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
2463 if (! elf_link_flush_output_syms (finfo
))
2467 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
2468 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
2469 ++finfo
->symbuf_count
;
2471 ++finfo
->output_bfd
->symcount
;
2476 /* Flush the output symbols to the file. */
2479 elf_link_flush_output_syms (finfo
)
2480 struct elf_final_link_info
*finfo
;
2482 if (finfo
->symbuf_count
> 0)
2484 Elf_Internal_Shdr
*symtab
;
2486 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
2488 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
2490 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
2491 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
2492 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
2495 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
2497 finfo
->symbuf_count
= 0;
2503 /* Add an external symbol to the symbol table. This is called from
2504 the hash table traversal routine. */
2507 elf_link_output_extsym (h
, data
)
2508 struct elf_link_hash_entry
*h
;
2511 struct elf_finfo_failed
*eif
= (struct elf_finfo_failed
*) data
;
2512 struct elf_final_link_info
*finfo
= eif
->finfo
;
2514 Elf_Internal_Sym sym
;
2515 asection
*input_sec
;
2517 /* If we are not creating a shared library, and this symbol is
2518 referenced by a shared library but is not defined anywhere, then
2519 warn that it is undefined. If we do not do this, the runtime
2520 linker will complain that the symbol is undefined when the
2521 program is run. We don't have to worry about symbols that are
2522 referenced by regular files, because we will already have issued
2523 warnings for them. */
2524 if (! finfo
->info
->relocateable
2525 && ! finfo
->info
->shared
2526 && h
->root
.type
== bfd_link_hash_undefined
2527 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
2528 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2530 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
2531 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
2532 (asection
*) NULL
, 0)))
2539 /* We don't want to output symbols that have never been mentioned by
2540 a regular file, or that we have been told to strip. However, if
2541 h->indx is set to -2, the symbol is used by a reloc and we must
2545 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2546 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2548 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2550 else if (finfo
->info
->strip
== strip_all
2551 || (finfo
->info
->strip
== strip_some
2552 && bfd_hash_lookup (finfo
->info
->keep_hash
,
2553 h
->root
.root
.string
,
2554 false, false) == NULL
))
2559 /* If we're stripping it, and it's not a dynamic symbol, there's
2560 nothing else to do. */
2561 if (strip
&& h
->dynindx
== -1)
2565 sym
.st_size
= h
->size
;
2567 if (h
->root
.type
== bfd_link_hash_undefweak
2568 || h
->root
.type
== bfd_link_hash_defweak
)
2569 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
2571 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
2573 switch (h
->root
.type
)
2576 case bfd_link_hash_new
:
2580 case bfd_link_hash_undefined
:
2581 input_sec
= bfd_und_section_ptr
;
2582 sym
.st_shndx
= SHN_UNDEF
;
2585 case bfd_link_hash_undefweak
:
2586 input_sec
= bfd_und_section_ptr
;
2587 sym
.st_shndx
= SHN_UNDEF
;
2590 case bfd_link_hash_defined
:
2591 case bfd_link_hash_defweak
:
2593 input_sec
= h
->root
.u
.def
.section
;
2594 if (input_sec
->output_section
!= NULL
)
2597 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
2598 input_sec
->output_section
);
2599 if (sym
.st_shndx
== (unsigned short) -1)
2605 /* ELF symbols in relocateable files are section relative,
2606 but in nonrelocateable files they are virtual
2608 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
2609 if (! finfo
->info
->relocateable
)
2610 sym
.st_value
+= input_sec
->output_section
->vma
;
2614 BFD_ASSERT ((bfd_get_flavour (input_sec
->owner
)
2615 == bfd_target_elf_flavour
)
2616 && elf_elfheader (input_sec
->owner
)->e_type
== ET_DYN
);
2617 sym
.st_shndx
= SHN_UNDEF
;
2618 input_sec
= bfd_und_section_ptr
;
2623 case bfd_link_hash_common
:
2624 input_sec
= bfd_com_section_ptr
;
2625 sym
.st_shndx
= SHN_COMMON
;
2626 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
2629 case bfd_link_hash_indirect
:
2630 case bfd_link_hash_warning
:
2631 /* We can't represent these symbols in ELF. A warning symbol
2632 may have come from a .gnu.warning.SYMBOL section anyhow. We
2633 just put the target symbol in the hash table. If the target
2634 symbol does not really exist, don't do anything. */
2635 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
2637 return (elf_link_output_extsym
2638 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
2641 /* If this symbol should be put in the .dynsym section, then put it
2642 there now. We have already know the symbol index. We also fill
2643 in the entry in the .hash section. */
2644 if (h
->dynindx
!= -1
2645 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
2647 struct elf_backend_data
*bed
;
2650 bfd_byte
*bucketpos
;
2653 sym
.st_name
= h
->dynstr_index
;
2655 /* Give the processor backend a chance to tweak the symbol
2656 value, and also to finish up anything that needs to be done
2658 bed
= get_elf_backend_data (finfo
->output_bfd
);
2659 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
2660 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
2666 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
2667 (PTR
) (((Elf_External_Sym
*)
2668 finfo
->dynsym_sec
->contents
)
2671 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
2672 bucket
= (bfd_elf_hash ((const unsigned char *) h
->root
.root
.string
)
2674 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
2675 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
2676 chain
= get_word (finfo
->output_bfd
, bucketpos
);
2677 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
2678 put_word (finfo
->output_bfd
, chain
,
2679 ((bfd_byte
*) finfo
->hash_sec
->contents
2680 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
2683 /* If we're stripping it, then it was just a dynamic symbol, and
2684 there's nothing else to do. */
2688 h
->indx
= finfo
->output_bfd
->symcount
;
2690 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
2699 /* Link an input file into the linker output file. This function
2700 handles all the sections and relocations of the input file at once.
2701 This is so that we only have to read the local symbols once, and
2702 don't have to keep them in memory. */
2705 elf_link_input_bfd (finfo
, input_bfd
)
2706 struct elf_final_link_info
*finfo
;
2709 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
2710 bfd
*, asection
*, bfd_byte
*,
2711 Elf_Internal_Rela
*,
2712 Elf_Internal_Sym
*, asection
**));
2714 Elf_Internal_Shdr
*symtab_hdr
;
2717 Elf_External_Sym
*esym
;
2718 Elf_External_Sym
*esymend
;
2719 Elf_Internal_Sym
*isym
;
2721 asection
**ppsection
;
2724 output_bfd
= finfo
->output_bfd
;
2726 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
2728 /* If this is a dynamic object, we don't want to do anything here:
2729 we don't want the local symbols, and we don't want the section
2731 if (elf_elfheader (input_bfd
)->e_type
== ET_DYN
)
2734 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2735 if (elf_bad_symtab (input_bfd
))
2737 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
2742 locsymcount
= symtab_hdr
->sh_info
;
2743 extsymoff
= symtab_hdr
->sh_info
;
2746 /* Read the local symbols. */
2748 && (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
2749 || (bfd_read (finfo
->external_syms
, sizeof (Elf_External_Sym
),
2750 locsymcount
, input_bfd
)
2751 != locsymcount
* sizeof (Elf_External_Sym
))))
2754 /* Swap in the local symbols and write out the ones which we know
2755 are going into the output file. */
2756 esym
= finfo
->external_syms
;
2757 esymend
= esym
+ locsymcount
;
2758 isym
= finfo
->internal_syms
;
2759 pindex
= finfo
->indices
;
2760 ppsection
= finfo
->sections
;
2761 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
2765 Elf_Internal_Sym osym
;
2767 elf_swap_symbol_in (input_bfd
, esym
, isym
);
2770 if (elf_bad_symtab (input_bfd
))
2772 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
2779 if (isym
->st_shndx
== SHN_UNDEF
)
2780 isec
= bfd_und_section_ptr
;
2781 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
2782 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
2783 else if (isym
->st_shndx
== SHN_ABS
)
2784 isec
= bfd_abs_section_ptr
;
2785 else if (isym
->st_shndx
== SHN_COMMON
)
2786 isec
= bfd_com_section_ptr
;
2795 /* Don't output the first, undefined, symbol. */
2796 if (esym
== finfo
->external_syms
)
2799 /* If we are stripping all symbols, we don't want to output this
2801 if (finfo
->info
->strip
== strip_all
)
2804 /* We never output section symbols. Instead, we use the section
2805 symbol of the corresponding section in the output file. */
2806 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2809 /* If we are discarding all local symbols, we don't want to
2810 output this one. If we are generating a relocateable output
2811 file, then some of the local symbols may be required by
2812 relocs; we output them below as we discover that they are
2814 if (finfo
->info
->discard
== discard_all
)
2817 /* Get the name of the symbol. */
2818 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
2823 /* See if we are discarding symbols with this name. */
2824 if ((finfo
->info
->strip
== strip_some
2825 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
2827 || (finfo
->info
->discard
== discard_l
2828 && strncmp (name
, finfo
->info
->lprefix
,
2829 finfo
->info
->lprefix_len
) == 0))
2832 /* If we get here, we are going to output this symbol. */
2836 /* Adjust the section index for the output file. */
2837 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
2838 isec
->output_section
);
2839 if (osym
.st_shndx
== (unsigned short) -1)
2842 *pindex
= output_bfd
->symcount
;
2844 /* ELF symbols in relocateable files are section relative, but
2845 in executable files they are virtual addresses. Note that
2846 this code assumes that all ELF sections have an associated
2847 BFD section with a reasonable value for output_offset; below
2848 we assume that they also have a reasonable value for
2849 output_section. Any special sections must be set up to meet
2850 these requirements. */
2851 osym
.st_value
+= isec
->output_offset
;
2852 if (! finfo
->info
->relocateable
)
2853 osym
.st_value
+= isec
->output_section
->vma
;
2855 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
2859 /* Relocate the contents of each section. */
2860 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
2862 if (! o
->linker_mark
)
2864 /* This section was omitted from the link. */
2868 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2869 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
2872 if ((o
->flags
& SEC_IN_MEMORY
) != 0
2873 && input_bfd
== elf_hash_table (finfo
->info
)->dynobj
)
2875 /* Section was created by elf_link_create_dynamic_sections.
2876 FIXME: This test is fragile. */
2880 /* Read the contents of the section. */
2881 if (! bfd_get_section_contents (input_bfd
, o
, finfo
->contents
,
2882 (file_ptr
) 0, o
->_raw_size
))
2885 if ((o
->flags
& SEC_RELOC
) != 0)
2887 Elf_Internal_Rela
*internal_relocs
;
2889 /* Get the swapped relocs. */
2890 internal_relocs
= elf_link_read_relocs (input_bfd
, o
,
2891 finfo
->external_relocs
,
2892 finfo
->internal_relocs
,
2894 if (internal_relocs
== NULL
2895 && o
->reloc_count
> 0)
2898 /* Relocate the section by invoking a back end routine.
2900 The back end routine is responsible for adjusting the
2901 section contents as necessary, and (if using Rela relocs
2902 and generating a relocateable output file) adjusting the
2903 reloc addend as necessary.
2905 The back end routine does not have to worry about setting
2906 the reloc address or the reloc symbol index.
2908 The back end routine is given a pointer to the swapped in
2909 internal symbols, and can access the hash table entries
2910 for the external symbols via elf_sym_hashes (input_bfd).
2912 When generating relocateable output, the back end routine
2913 must handle STB_LOCAL/STT_SECTION symbols specially. The
2914 output symbol is going to be a section symbol
2915 corresponding to the output section, which will require
2916 the addend to be adjusted. */
2918 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
2922 finfo
->internal_syms
,
2926 if (finfo
->info
->relocateable
)
2928 Elf_Internal_Rela
*irela
;
2929 Elf_Internal_Rela
*irelaend
;
2930 struct elf_link_hash_entry
**rel_hash
;
2931 Elf_Internal_Shdr
*input_rel_hdr
;
2932 Elf_Internal_Shdr
*output_rel_hdr
;
2934 /* Adjust the reloc addresses and symbol indices. */
2936 irela
= internal_relocs
;
2937 irelaend
= irela
+ o
->reloc_count
;
2938 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
2939 + o
->output_section
->reloc_count
);
2940 for (; irela
< irelaend
; irela
++, rel_hash
++)
2942 unsigned long r_symndx
;
2943 Elf_Internal_Sym
*isym
;
2946 irela
->r_offset
+= o
->output_offset
;
2948 r_symndx
= ELF_R_SYM (irela
->r_info
);
2953 if (r_symndx
>= locsymcount
2954 || (elf_bad_symtab (input_bfd
)
2955 && finfo
->sections
[r_symndx
] == NULL
))
2959 /* This is a reloc against a global symbol. We
2960 have not yet output all the local symbols, so
2961 we do not know the symbol index of any global
2962 symbol. We set the rel_hash entry for this
2963 reloc to point to the global hash table entry
2964 for this symbol. The symbol index is then
2965 set at the end of elf_bfd_final_link. */
2966 indx
= r_symndx
- extsymoff
;
2967 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
2969 /* Setting the index to -2 tells
2970 elf_link_output_extsym that this symbol is
2972 BFD_ASSERT ((*rel_hash
)->indx
< 0);
2973 (*rel_hash
)->indx
= -2;
2978 /* This is a reloc against a local symbol. */
2981 isym
= finfo
->internal_syms
+ r_symndx
;
2982 sec
= finfo
->sections
[r_symndx
];
2983 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2985 /* I suppose the backend ought to fill in the
2986 section of any STT_SECTION symbol against a
2987 processor specific section. */
2988 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
2990 else if (sec
== NULL
|| sec
->owner
== NULL
)
2992 bfd_set_error (bfd_error_bad_value
);
2997 r_symndx
= sec
->output_section
->target_index
;
2998 BFD_ASSERT (r_symndx
!= 0);
3003 if (finfo
->indices
[r_symndx
] == -1)
3009 if (finfo
->info
->strip
== strip_all
)
3011 /* You can't do ld -r -s. */
3012 bfd_set_error (bfd_error_invalid_operation
);
3016 /* This symbol was skipped earlier, but
3017 since it is needed by a reloc, we
3018 must output it now. */
3019 link
= symtab_hdr
->sh_link
;
3020 name
= bfd_elf_string_from_elf_section (input_bfd
,
3026 osec
= sec
->output_section
;
3028 _bfd_elf_section_from_bfd_section (output_bfd
,
3030 if (isym
->st_shndx
== (unsigned short) -1)
3033 isym
->st_value
+= sec
->output_offset
;
3034 if (! finfo
->info
->relocateable
)
3035 isym
->st_value
+= osec
->vma
;
3037 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
3039 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
3043 r_symndx
= finfo
->indices
[r_symndx
];
3046 irela
->r_info
= ELF_R_INFO (r_symndx
,
3047 ELF_R_TYPE (irela
->r_info
));
3050 /* Swap out the relocs. */
3051 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3052 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
3053 BFD_ASSERT (output_rel_hdr
->sh_entsize
3054 == input_rel_hdr
->sh_entsize
);
3055 irela
= internal_relocs
;
3056 irelaend
= irela
+ o
->reloc_count
;
3057 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3059 Elf_External_Rel
*erel
;
3061 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
3062 + o
->output_section
->reloc_count
);
3063 for (; irela
< irelaend
; irela
++, erel
++)
3065 Elf_Internal_Rel irel
;
3067 irel
.r_offset
= irela
->r_offset
;
3068 irel
.r_info
= irela
->r_info
;
3069 BFD_ASSERT (irela
->r_addend
== 0);
3070 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3075 Elf_External_Rela
*erela
;
3077 BFD_ASSERT (input_rel_hdr
->sh_entsize
3078 == sizeof (Elf_External_Rela
));
3079 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
3080 + o
->output_section
->reloc_count
);
3081 for (; irela
< irelaend
; irela
++, erela
++)
3082 elf_swap_reloca_out (output_bfd
, irela
, erela
);
3085 o
->output_section
->reloc_count
+= o
->reloc_count
;
3089 /* Write out the modified section contents. */
3090 if (elf_section_data (o
)->stab_info
== NULL
)
3092 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
3093 finfo
->contents
, o
->output_offset
,
3094 (o
->_cooked_size
!= 0
3101 if (! _bfd_write_section_stabs (output_bfd
, o
,
3102 &elf_section_data (o
)->stab_info
,
3111 /* Generate a reloc when linking an ELF file. This is a reloc
3112 requested by the linker, and does come from any input file. This
3113 is used to build constructor and destructor tables when linking
3117 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
3119 struct bfd_link_info
*info
;
3120 asection
*output_section
;
3121 struct bfd_link_order
*link_order
;
3123 reloc_howto_type
*howto
;
3127 struct elf_link_hash_entry
**rel_hash_ptr
;
3128 Elf_Internal_Shdr
*rel_hdr
;
3130 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
3133 bfd_set_error (bfd_error_bad_value
);
3137 addend
= link_order
->u
.reloc
.p
->addend
;
3139 /* Figure out the symbol index. */
3140 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
3141 + output_section
->reloc_count
);
3142 if (link_order
->type
== bfd_section_reloc_link_order
)
3144 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
3145 BFD_ASSERT (indx
!= 0);
3146 *rel_hash_ptr
= NULL
;
3150 struct elf_link_hash_entry
*h
;
3152 /* Treat a reloc against a defined symbol as though it were
3153 actually against the section. */
3154 h
= ((struct elf_link_hash_entry
*)
3155 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
3156 link_order
->u
.reloc
.p
->u
.name
,
3157 false, false, true));
3159 && (h
->root
.type
== bfd_link_hash_defined
3160 || h
->root
.type
== bfd_link_hash_defweak
))
3164 section
= h
->root
.u
.def
.section
;
3165 indx
= section
->output_section
->target_index
;
3166 *rel_hash_ptr
= NULL
;
3167 /* It seems that we ought to add the symbol value to the
3168 addend here, but in practice it has already been added
3169 because it was passed to constructor_callback. */
3170 addend
+= section
->output_section
->vma
+ section
->output_offset
;
3174 /* Setting the index to -2 tells elf_link_output_extsym that
3175 this symbol is used by a reloc. */
3182 if (! ((*info
->callbacks
->unattached_reloc
)
3183 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
3184 (asection
*) NULL
, (bfd_vma
) 0)))
3190 /* If this is an inplace reloc, we must write the addend into the
3192 if (howto
->partial_inplace
&& addend
!= 0)
3195 bfd_reloc_status_type rstat
;
3199 size
= bfd_get_reloc_size (howto
);
3200 buf
= (bfd_byte
*) bfd_zmalloc (size
);
3201 if (buf
== (bfd_byte
*) NULL
)
3203 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
3209 case bfd_reloc_outofrange
:
3211 case bfd_reloc_overflow
:
3212 if (! ((*info
->callbacks
->reloc_overflow
)
3214 (link_order
->type
== bfd_section_reloc_link_order
3215 ? bfd_section_name (output_bfd
,
3216 link_order
->u
.reloc
.p
->u
.section
)
3217 : link_order
->u
.reloc
.p
->u
.name
),
3218 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
3226 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
3227 (file_ptr
) link_order
->offset
, size
);
3233 /* The address of a reloc is relative to the section in a
3234 relocateable file, and is a virtual address in an executable
3236 offset
= link_order
->offset
;
3237 if (! info
->relocateable
)
3238 offset
+= output_section
->vma
;
3240 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
3242 if (rel_hdr
->sh_type
== SHT_REL
)
3244 Elf_Internal_Rel irel
;
3245 Elf_External_Rel
*erel
;
3247 irel
.r_offset
= offset
;
3248 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3249 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
3250 + output_section
->reloc_count
);
3251 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3255 Elf_Internal_Rela irela
;
3256 Elf_External_Rela
*erela
;
3258 irela
.r_offset
= offset
;
3259 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3260 irela
.r_addend
= addend
;
3261 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
3262 + output_section
->reloc_count
);
3263 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
3266 ++output_section
->reloc_count
;
3272 /* Allocate a pointer to live in a linker created section. */
3275 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
3277 struct bfd_link_info
*info
;
3278 elf_linker_section_t
*lsect
;
3279 struct elf_link_hash_entry
*h
;
3280 const Elf_Internal_Rela
*rel
;
3282 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
3283 elf_linker_section_pointers_t
*linker_section_ptr
;
3284 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
3286 BFD_ASSERT (lsect
!= NULL
);
3288 /* Is this a global symbol? */
3291 /* Has this symbol already been allocated, if so, our work is done */
3292 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3297 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
3298 /* Make sure this symbol is output as a dynamic symbol. */
3299 if (h
->dynindx
== -1)
3301 if (! elf_link_record_dynamic_symbol (info
, h
))
3305 if (lsect
->rel_section
)
3306 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3309 else /* Allocation of a pointer to a local symbol */
3311 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
3313 /* Allocate a table to hold the local symbols if first time */
3316 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
3317 register unsigned int i
;
3319 ptr
= (elf_linker_section_pointers_t
**)
3320 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
3325 elf_local_ptr_offsets (abfd
) = ptr
;
3326 for (i
= 0; i
< num_symbols
; i
++)
3327 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
3330 /* Has this symbol already been allocated, if so, our work is done */
3331 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
3336 ptr_linker_section_ptr
= &ptr
[r_symndx
];
3340 /* If we are generating a shared object, we need to
3341 output a R_<xxx>_RELATIVE reloc so that the
3342 dynamic linker can adjust this GOT entry. */
3343 BFD_ASSERT (lsect
->rel_section
!= NULL
);
3344 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3348 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3349 from internal memory. */
3350 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
3351 linker_section_ptr
= (elf_linker_section_pointers_t
*)
3352 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
3354 if (!linker_section_ptr
)
3357 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
3358 linker_section_ptr
->addend
= rel
->r_addend
;
3359 linker_section_ptr
->which
= lsect
->which
;
3360 linker_section_ptr
->written_address_p
= false;
3361 *ptr_linker_section_ptr
= linker_section_ptr
;
3363 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
3365 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
;
3366 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
3367 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
3368 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
3369 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
3372 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
3374 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
3377 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3378 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
3386 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3389 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3392 /* Fill in the address for a pointer generated in alinker section. */
3395 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
3398 struct bfd_link_info
*info
;
3399 elf_linker_section_t
*lsect
;
3400 struct elf_link_hash_entry
*h
;
3402 const Elf_Internal_Rela
*rel
;
3405 elf_linker_section_pointers_t
*linker_section_ptr
;
3407 BFD_ASSERT (lsect
!= NULL
);
3409 if (h
!= NULL
) /* global symbol */
3411 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3415 BFD_ASSERT (linker_section_ptr
!= NULL
);
3417 if (! elf_hash_table (info
)->dynamic_sections_created
3420 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
3422 /* This is actually a static link, or it is a
3423 -Bsymbolic link and the symbol is defined
3424 locally. We must initialize this entry in the
3427 When doing a dynamic link, we create a .rela.<xxx>
3428 relocation entry to initialize the value. This
3429 is done in the finish_dynamic_symbol routine. */
3430 if (!linker_section_ptr
->written_address_p
)
3432 linker_section_ptr
->written_address_p
= true;
3433 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3434 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3438 else /* local symbol */
3440 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
3441 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
3442 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
3443 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
3447 BFD_ASSERT (linker_section_ptr
!= NULL
);
3449 /* Write out pointer if it hasn't been rewritten out before */
3450 if (!linker_section_ptr
->written_address_p
)
3452 linker_section_ptr
->written_address_p
= true;
3453 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3454 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3458 asection
*srel
= lsect
->rel_section
;
3459 Elf_Internal_Rela outrel
;
3461 /* We need to generate a relative reloc for the dynamic linker. */
3463 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
3466 BFD_ASSERT (srel
!= NULL
);
3468 outrel
.r_offset
= (lsect
->section
->output_section
->vma
3469 + lsect
->section
->output_offset
3470 + linker_section_ptr
->offset
);
3471 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
3472 outrel
.r_addend
= 0;
3473 elf_swap_reloca_out (output_bfd
, &outrel
,
3474 (((Elf_External_Rela
*)
3475 lsect
->section
->contents
)
3476 + lsect
->section
->reloc_count
));
3477 ++lsect
->section
->reloc_count
;
3482 relocation
= (lsect
->section
->output_offset
3483 + linker_section_ptr
->offset
3484 - lsect
->hole_offset
3485 - lsect
->sym_offset
);
3488 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3489 lsect
->name
, (long)relocation
, (long)relocation
);
3492 /* Subtract out the addend, because it will get added back in by the normal
3494 return relocation
- linker_section_ptr
->addend
;