1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997 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. */
26 static reloc_howto_type
*elf_i386_reloc_type_lookup
27 PARAMS ((bfd
*, bfd_reloc_code_real_type
));
28 static void elf_i386_info_to_howto
29 PARAMS ((bfd
*, arelent
*, Elf32_Internal_Rela
*));
30 static void elf_i386_info_to_howto_rel
31 PARAMS ((bfd
*, arelent
*, Elf32_Internal_Rel
*));
32 static boolean elf_i386_is_local_label_name
PARAMS ((bfd
*, const char *));
33 static struct bfd_hash_entry
*elf_i386_link_hash_newfunc
34 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
35 static struct bfd_link_hash_table
*elf_i386_link_hash_table_create
37 static boolean elf_i386_check_relocs
38 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
39 const Elf_Internal_Rela
*));
40 static boolean elf_i386_adjust_dynamic_symbol
41 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
42 static boolean elf_i386_size_dynamic_sections
43 PARAMS ((bfd
*, struct bfd_link_info
*));
44 static boolean elf_i386_relocate_section
45 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
46 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
47 static boolean elf_i386_finish_dynamic_symbol
48 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
50 static boolean elf_i386_finish_dynamic_sections
51 PARAMS ((bfd
*, struct bfd_link_info
*));
53 #define USE_REL 1 /* 386 uses REL relocations instead of RELA */
69 LAST_INVALID_RELOC
= 19,
70 /* The remaining relocs are a GNU extension. */
79 static CONST
char *CONST reloc_type_names
[] =
95 static reloc_howto_type elf_howto_table
[]=
97 HOWTO(R_386_NONE
, 0,0, 0,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_NONE", true,0x00000000,0x00000000,false),
98 HOWTO(R_386_32
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_32", true,0xffffffff,0xffffffff,false),
99 HOWTO(R_386_PC32
, 0,2,32,true, 0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_PC32", true,0xffffffff,0xffffffff,true),
100 HOWTO(R_386_GOT32
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_GOT32", true,0xffffffff,0xffffffff,false),
101 HOWTO(R_386_PLT32
, 0,2,32,true,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_PLT32", true,0xffffffff,0xffffffff,true),
102 HOWTO(R_386_COPY
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_COPY", true,0xffffffff,0xffffffff,false),
103 HOWTO(R_386_GLOB_DAT
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false),
104 HOWTO(R_386_JUMP_SLOT
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false),
105 HOWTO(R_386_RELATIVE
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false),
106 HOWTO(R_386_GOTOFF
, 0,2,32,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_GOTOFF", true,0xffffffff,0xffffffff,false),
107 HOWTO(R_386_GOTPC
, 0,2,32,true,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_GOTPC", true,0xffffffff,0xffffffff,true),
117 /* The remaining relocs are a GNU extension. */
118 HOWTO(R_386_16
, 0,1,16,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_16", true,0xffff,0xffff,false),
119 HOWTO(R_386_PC16
, 0,1,16,true, 0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_PC16", true,0xffff,0xffff,true),
120 HOWTO(R_386_8
, 0,0,8,false,0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_8", true,0xff,0xff,false),
121 HOWTO(R_386_PC8
, 0,0,8,true, 0,complain_overflow_bitfield
, bfd_elf_generic_reloc
,"R_386_PC8", true,0xff,0xff,true),
124 #ifdef DEBUG_GEN_RELOC
125 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
130 static reloc_howto_type
*
131 elf_i386_reloc_type_lookup (abfd
, code
)
133 bfd_reloc_code_real_type code
;
138 TRACE ("BFD_RELOC_NONE");
139 return &elf_howto_table
[ (int)R_386_NONE
];
142 TRACE ("BFD_RELOC_32");
143 return &elf_howto_table
[ (int)R_386_32
];
145 case BFD_RELOC_32_PCREL
:
146 TRACE ("BFD_RELOC_PC32");
147 return &elf_howto_table
[ (int)R_386_PC32
];
149 case BFD_RELOC_386_GOT32
:
150 TRACE ("BFD_RELOC_386_GOT32");
151 return &elf_howto_table
[ (int)R_386_GOT32
];
153 case BFD_RELOC_386_PLT32
:
154 TRACE ("BFD_RELOC_386_PLT32");
155 return &elf_howto_table
[ (int)R_386_PLT32
];
157 case BFD_RELOC_386_COPY
:
158 TRACE ("BFD_RELOC_386_COPY");
159 return &elf_howto_table
[ (int)R_386_COPY
];
161 case BFD_RELOC_386_GLOB_DAT
:
162 TRACE ("BFD_RELOC_386_GLOB_DAT");
163 return &elf_howto_table
[ (int)R_386_GLOB_DAT
];
165 case BFD_RELOC_386_JUMP_SLOT
:
166 TRACE ("BFD_RELOC_386_JUMP_SLOT");
167 return &elf_howto_table
[ (int)R_386_JUMP_SLOT
];
169 case BFD_RELOC_386_RELATIVE
:
170 TRACE ("BFD_RELOC_386_RELATIVE");
171 return &elf_howto_table
[ (int)R_386_RELATIVE
];
173 case BFD_RELOC_386_GOTOFF
:
174 TRACE ("BFD_RELOC_386_GOTOFF");
175 return &elf_howto_table
[ (int)R_386_GOTOFF
];
177 case BFD_RELOC_386_GOTPC
:
178 TRACE ("BFD_RELOC_386_GOTPC");
179 return &elf_howto_table
[ (int)R_386_GOTPC
];
181 /* The remaining relocs are a GNU extension. */
183 TRACE ("BFD_RELOC_16");
184 return &elf_howto_table
[(int) R_386_16
];
186 case BFD_RELOC_16_PCREL
:
187 TRACE ("BFD_RELOC_16_PCREL");
188 return &elf_howto_table
[(int) R_386_PC16
];
191 TRACE ("BFD_RELOC_8");
192 return &elf_howto_table
[(int) R_386_8
];
194 case BFD_RELOC_8_PCREL
:
195 TRACE ("BFD_RELOC_8_PCREL");
196 return &elf_howto_table
[(int) R_386_PC8
];
207 elf_i386_info_to_howto (abfd
, cache_ptr
, dst
)
210 Elf32_Internal_Rela
*dst
;
216 elf_i386_info_to_howto_rel (abfd
, cache_ptr
, dst
)
219 Elf32_Internal_Rel
*dst
;
221 enum reloc_type type
;
223 type
= (enum reloc_type
) ELF32_R_TYPE (dst
->r_info
);
224 BFD_ASSERT (type
< R_386_max
);
225 BFD_ASSERT (type
< FIRST_INVALID_RELOC
|| type
> LAST_INVALID_RELOC
);
227 cache_ptr
->howto
= &elf_howto_table
[(int) type
];
230 /* Return whether a symbol name implies a local label. The UnixWare
231 2.1 cc generates temporary symbols that start with .X, so we
232 recognize them here. FIXME: do other SVR4 compilers also use .X?.
233 If so, we should move the .X recognition into
234 _bfd_elf_is_local_label_name. */
237 elf_i386_is_local_label_name (abfd
, name
)
241 if (name
[0] == '.' && name
[1] == 'X')
244 return _bfd_elf_is_local_label_name (abfd
, name
);
247 /* Functions for the i386 ELF linker. */
249 /* The name of the dynamic interpreter. This is put in the .interp
252 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
254 /* The size in bytes of an entry in the procedure linkage table. */
256 #define PLT_ENTRY_SIZE 16
258 /* The first entry in an absolute procedure linkage table looks like
259 this. See the SVR4 ABI i386 supplement to see how this works. */
261 static const bfd_byte elf_i386_plt0_entry
[PLT_ENTRY_SIZE
] =
263 0xff, 0x35, /* pushl contents of address */
264 0, 0, 0, 0, /* replaced with address of .got + 4. */
265 0xff, 0x25, /* jmp indirect */
266 0, 0, 0, 0, /* replaced with address of .got + 8. */
267 0, 0, 0, 0 /* pad out to 16 bytes. */
270 /* Subsequent entries in an absolute procedure linkage table look like
273 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
275 0xff, 0x25, /* jmp indirect */
276 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
277 0x68, /* pushl immediate */
278 0, 0, 0, 0, /* replaced with offset into relocation table. */
279 0xe9, /* jmp relative */
280 0, 0, 0, 0 /* replaced with offset to start of .plt. */
283 /* The first entry in a PIC procedure linkage table look like this. */
285 static const bfd_byte elf_i386_pic_plt0_entry
[PLT_ENTRY_SIZE
] =
287 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
288 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
289 0, 0, 0, 0 /* pad out to 16 bytes. */
292 /* Subsequent entries in a PIC procedure linkage table look like this. */
294 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
296 0xff, 0xa3, /* jmp *offset(%ebx) */
297 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
298 0x68, /* pushl immediate */
299 0, 0, 0, 0, /* replaced with offset into relocation table. */
300 0xe9, /* jmp relative */
301 0, 0, 0, 0 /* replaced with offset to start of .plt. */
304 /* The i386 linker needs to keep track of the number of relocs that it
305 decides to copy in check_relocs for each symbol. This is so that
306 it can discard PC relative relocs if it doesn't need them when
307 linking with -Bsymbolic. We store the information in a field
308 extending the regular ELF linker hash table. */
310 /* This structure keeps track of the number of PC relative relocs we
311 have copied for a given symbol. */
313 struct elf_i386_pcrel_relocs_copied
316 struct elf_i386_pcrel_relocs_copied
*next
;
317 /* A section in dynobj. */
319 /* Number of relocs copied in this section. */
323 /* i386 ELF linker hash entry. */
325 struct elf_i386_link_hash_entry
327 struct elf_link_hash_entry root
;
329 /* Number of PC relative relocs copied for this symbol. */
330 struct elf_i386_pcrel_relocs_copied
*pcrel_relocs_copied
;
333 /* i386 ELF linker hash table. */
335 struct elf_i386_link_hash_table
337 struct elf_link_hash_table root
;
340 /* Declare this now that the above structures are defined. */
342 static boolean elf_i386_discard_copies
343 PARAMS ((struct elf_i386_link_hash_entry
*, PTR
));
345 /* Traverse an i386 ELF linker hash table. */
347 #define elf_i386_link_hash_traverse(table, func, info) \
348 (elf_link_hash_traverse \
350 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
353 /* Get the i386 ELF linker hash table from a link_info structure. */
355 #define elf_i386_hash_table(p) \
356 ((struct elf_i386_link_hash_table *) ((p)->hash))
358 /* Create an entry in an i386 ELF linker hash table. */
360 static struct bfd_hash_entry
*
361 elf_i386_link_hash_newfunc (entry
, table
, string
)
362 struct bfd_hash_entry
*entry
;
363 struct bfd_hash_table
*table
;
366 struct elf_i386_link_hash_entry
*ret
=
367 (struct elf_i386_link_hash_entry
*) entry
;
369 /* Allocate the structure if it has not already been allocated by a
371 if (ret
== (struct elf_i386_link_hash_entry
*) NULL
)
372 ret
= ((struct elf_i386_link_hash_entry
*)
373 bfd_hash_allocate (table
,
374 sizeof (struct elf_i386_link_hash_entry
)));
375 if (ret
== (struct elf_i386_link_hash_entry
*) NULL
)
376 return (struct bfd_hash_entry
*) ret
;
378 /* Call the allocation method of the superclass. */
379 ret
= ((struct elf_i386_link_hash_entry
*)
380 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
382 if (ret
!= (struct elf_i386_link_hash_entry
*) NULL
)
384 ret
->pcrel_relocs_copied
= NULL
;
387 return (struct bfd_hash_entry
*) ret
;
390 /* Create an i386 ELF linker hash table. */
392 static struct bfd_link_hash_table
*
393 elf_i386_link_hash_table_create (abfd
)
396 struct elf_i386_link_hash_table
*ret
;
398 ret
= ((struct elf_i386_link_hash_table
*)
399 bfd_alloc (abfd
, sizeof (struct elf_i386_link_hash_table
)));
400 if (ret
== (struct elf_i386_link_hash_table
*) NULL
)
403 if (! _bfd_elf_link_hash_table_init (&ret
->root
, abfd
,
404 elf_i386_link_hash_newfunc
))
406 bfd_release (abfd
, ret
);
410 return &ret
->root
.root
;
413 /* Look through the relocs for a section during the first phase, and
414 allocate space in the global offset table or procedure linkage
418 elf_i386_check_relocs (abfd
, info
, sec
, relocs
)
420 struct bfd_link_info
*info
;
422 const Elf_Internal_Rela
*relocs
;
425 Elf_Internal_Shdr
*symtab_hdr
;
426 struct elf_link_hash_entry
**sym_hashes
;
427 bfd_vma
*local_got_offsets
;
428 const Elf_Internal_Rela
*rel
;
429 const Elf_Internal_Rela
*rel_end
;
434 if (info
->relocateable
)
437 dynobj
= elf_hash_table (info
)->dynobj
;
438 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
439 sym_hashes
= elf_sym_hashes (abfd
);
440 local_got_offsets
= elf_local_got_offsets (abfd
);
446 rel_end
= relocs
+ sec
->reloc_count
;
447 for (rel
= relocs
; rel
< rel_end
; rel
++)
449 unsigned long r_symndx
;
450 struct elf_link_hash_entry
*h
;
452 r_symndx
= ELF32_R_SYM (rel
->r_info
);
454 if (r_symndx
< symtab_hdr
->sh_info
)
457 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
459 /* Some relocs require a global offset table. */
462 switch (ELF32_R_TYPE (rel
->r_info
))
467 elf_hash_table (info
)->dynobj
= dynobj
= abfd
;
468 if (! _bfd_elf_create_got_section (dynobj
, info
))
477 switch (ELF32_R_TYPE (rel
->r_info
))
480 /* This symbol requires a global offset table entry. */
484 sgot
= bfd_get_section_by_name (dynobj
, ".got");
485 BFD_ASSERT (sgot
!= NULL
);
489 && (h
!= NULL
|| info
->shared
))
491 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
494 srelgot
= bfd_make_section (dynobj
, ".rel.got");
496 || ! bfd_set_section_flags (dynobj
, srelgot
,
503 || ! bfd_set_section_alignment (dynobj
, srelgot
, 2))
510 if (h
->got_offset
!= (bfd_vma
) -1)
512 /* We have already allocated space in the .got. */
515 h
->got_offset
= sgot
->_raw_size
;
517 /* Make sure this symbol is output as a dynamic symbol. */
518 if (h
->dynindx
== -1)
520 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
524 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
528 /* This is a global offset table entry for a local
530 if (local_got_offsets
== NULL
)
533 register unsigned int i
;
535 size
= symtab_hdr
->sh_info
* sizeof (bfd_vma
);
536 local_got_offsets
= (bfd_vma
*) bfd_alloc (abfd
, size
);
537 if (local_got_offsets
== NULL
)
539 elf_local_got_offsets (abfd
) = local_got_offsets
;
540 for (i
= 0; i
< symtab_hdr
->sh_info
; i
++)
541 local_got_offsets
[i
] = (bfd_vma
) -1;
543 if (local_got_offsets
[r_symndx
] != (bfd_vma
) -1)
545 /* We have already allocated space in the .got. */
548 local_got_offsets
[r_symndx
] = sgot
->_raw_size
;
552 /* If we are generating a shared object, we need to
553 output a R_386_RELATIVE reloc so that the dynamic
554 linker can adjust this GOT entry. */
555 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
559 sgot
->_raw_size
+= 4;
564 /* This symbol requires a procedure linkage table entry. We
565 actually build the entry in adjust_dynamic_symbol,
566 because this might be a case of linking PIC code which is
567 never referenced by a dynamic object, in which case we
568 don't need to generate a procedure linkage table entry
571 /* If this is a local symbol, we resolve it directly without
572 creating a procedure linkage table entry. */
576 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
582 /* If we are creating a shared library, and this is a reloc
583 against a global symbol, or a non PC relative reloc
584 against a local symbol, then we need to copy the reloc
585 into the shared library. However, if we are linking with
586 -Bsymbolic, we do not need to copy a reloc against a
587 global symbol which is defined in an object we are
588 including in the link (i.e., DEF_REGULAR is set). At
589 this point we have not seen all the input files, so it is
590 possible that DEF_REGULAR is not set now but will be set
591 later (it is never cleared). We account for that
592 possibility below by storing information in the
593 pcrel_relocs_copied field of the hash table entry. */
595 && (ELF32_R_TYPE (rel
->r_info
) != R_386_PC32
598 || (h
->elf_link_hash_flags
599 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
601 /* When creating a shared object, we must copy these
602 reloc types into the output file. We create a reloc
603 section in dynobj and make room for this reloc. */
608 name
= (bfd_elf_string_from_elf_section
610 elf_elfheader (abfd
)->e_shstrndx
,
611 elf_section_data (sec
)->rel_hdr
.sh_name
));
615 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
616 && strcmp (bfd_get_section_name (abfd
, sec
),
619 sreloc
= bfd_get_section_by_name (dynobj
, name
);
624 sreloc
= bfd_make_section (dynobj
, name
);
625 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
626 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
627 if ((sec
->flags
& SEC_ALLOC
) != 0)
628 flags
|= SEC_ALLOC
| SEC_LOAD
;
630 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
631 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
636 sreloc
->_raw_size
+= sizeof (Elf32_External_Rel
);
638 /* If we are linking with -Bsymbolic, and this is a
639 global symbol, we count the number of PC relative
640 relocations we have entered for this symbol, so that
641 we can discard them again if the symbol is later
642 defined by a regular object. Note that this function
643 is only called if we are using an elf_i386 linker
644 hash table, which means that h is really a pointer to
645 an elf_i386_link_hash_entry. */
646 if (h
!= NULL
&& info
->symbolic
647 && ELF32_R_TYPE (rel
->r_info
) == R_386_PC32
)
649 struct elf_i386_link_hash_entry
*eh
;
650 struct elf_i386_pcrel_relocs_copied
*p
;
652 eh
= (struct elf_i386_link_hash_entry
*) h
;
654 for (p
= eh
->pcrel_relocs_copied
; p
!= NULL
; p
= p
->next
)
655 if (p
->section
== sreloc
)
660 p
= ((struct elf_i386_pcrel_relocs_copied
*)
661 bfd_alloc (dynobj
, sizeof *p
));
664 p
->next
= eh
->pcrel_relocs_copied
;
665 eh
->pcrel_relocs_copied
= p
;
684 /* Adjust a symbol defined by a dynamic object and referenced by a
685 regular object. The current definition is in some section of the
686 dynamic object, but we're not including those sections. We have to
687 change the definition to something the rest of the link can
691 elf_i386_adjust_dynamic_symbol (info
, h
)
692 struct bfd_link_info
*info
;
693 struct elf_link_hash_entry
*h
;
697 unsigned int power_of_two
;
699 dynobj
= elf_hash_table (info
)->dynobj
;
701 /* Make sure we know what is going on here. */
702 BFD_ASSERT (dynobj
!= NULL
703 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
704 || h
->weakdef
!= NULL
705 || ((h
->elf_link_hash_flags
706 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
707 && (h
->elf_link_hash_flags
708 & ELF_LINK_HASH_REF_REGULAR
) != 0
709 && (h
->elf_link_hash_flags
710 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
712 /* If this is a function, put it in the procedure linkage table. We
713 will fill in the contents of the procedure linkage table later,
714 when we know the address of the .got section. */
715 if (h
->type
== STT_FUNC
716 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
719 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
720 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0)
722 /* This case can occur if we saw a PLT32 reloc in an input
723 file, but the symbol was never referred to by a dynamic
724 object. In such a case, we don't actually need to build
725 a procedure linkage table, and we can just do a PC32
727 BFD_ASSERT ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0);
731 /* Make sure this symbol is output as a dynamic symbol. */
732 if (h
->dynindx
== -1)
734 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
738 s
= bfd_get_section_by_name (dynobj
, ".plt");
739 BFD_ASSERT (s
!= NULL
);
741 /* If this is the first .plt entry, make room for the special
743 if (s
->_raw_size
== 0)
744 s
->_raw_size
+= PLT_ENTRY_SIZE
;
746 /* If this symbol is not defined in a regular file, and we are
747 not generating a shared library, then set the symbol to this
748 location in the .plt. This is required to make function
749 pointers compare as equal between the normal executable and
750 the shared library. */
752 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
754 h
->root
.u
.def
.section
= s
;
755 h
->root
.u
.def
.value
= s
->_raw_size
;
758 h
->plt_offset
= s
->_raw_size
;
760 /* Make room for this entry. */
761 s
->_raw_size
+= PLT_ENTRY_SIZE
;
763 /* We also need to make an entry in the .got.plt section, which
764 will be placed in the .got section by the linker script. */
766 s
= bfd_get_section_by_name (dynobj
, ".got.plt");
767 BFD_ASSERT (s
!= NULL
);
770 /* We also need to make an entry in the .rel.plt section. */
772 s
= bfd_get_section_by_name (dynobj
, ".rel.plt");
773 BFD_ASSERT (s
!= NULL
);
774 s
->_raw_size
+= sizeof (Elf32_External_Rel
);
779 /* If this is a weak symbol, and there is a real definition, the
780 processor independent code will have arranged for us to see the
781 real definition first, and we can just use the same value. */
782 if (h
->weakdef
!= NULL
)
784 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
785 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
786 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
787 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
791 /* This is a reference to a symbol defined by a dynamic object which
792 is not a function. */
794 /* If we are creating a shared library, we must presume that the
795 only references to the symbol are via the global offset table.
796 For such cases we need not do anything here; the relocations will
797 be handled correctly by relocate_section. */
801 /* We must allocate the symbol in our .dynbss section, which will
802 become part of the .bss section of the executable. There will be
803 an entry for this symbol in the .dynsym section. The dynamic
804 object will contain position independent code, so all references
805 from the dynamic object to this symbol will go through the global
806 offset table. The dynamic linker will use the .dynsym entry to
807 determine the address it must put in the global offset table, so
808 both the dynamic object and the regular object will refer to the
809 same memory location for the variable. */
811 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
812 BFD_ASSERT (s
!= NULL
);
814 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
815 copy the initial value out of the dynamic object and into the
816 runtime process image. We need to remember the offset into the
817 .rel.bss section we are going to use. */
818 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
822 srel
= bfd_get_section_by_name (dynobj
, ".rel.bss");
823 BFD_ASSERT (srel
!= NULL
);
824 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
825 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
828 /* We need to figure out the alignment required for this symbol. I
829 have no idea how ELF linkers handle this. */
830 power_of_two
= bfd_log2 (h
->size
);
831 if (power_of_two
> 3)
834 /* Apply the required alignment. */
835 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
,
836 (bfd_size_type
) (1 << power_of_two
));
837 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
839 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
843 /* Define the symbol as being at this point in the section. */
844 h
->root
.u
.def
.section
= s
;
845 h
->root
.u
.def
.value
= s
->_raw_size
;
847 /* Increment the section size to make room for the symbol. */
848 s
->_raw_size
+= h
->size
;
853 /* Set the sizes of the dynamic sections. */
856 elf_i386_size_dynamic_sections (output_bfd
, info
)
858 struct bfd_link_info
*info
;
866 dynobj
= elf_hash_table (info
)->dynobj
;
867 BFD_ASSERT (dynobj
!= NULL
);
869 if (elf_hash_table (info
)->dynamic_sections_created
)
871 /* Set the contents of the .interp section to the interpreter. */
874 s
= bfd_get_section_by_name (dynobj
, ".interp");
875 BFD_ASSERT (s
!= NULL
);
876 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
877 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
882 /* We may have created entries in the .rel.got section.
883 However, if we are not creating the dynamic sections, we will
884 not actually use these entries. Reset the size of .rel.got,
885 which will cause it to get stripped from the output file
887 s
= bfd_get_section_by_name (dynobj
, ".rel.got");
892 /* If this is a -Bsymbolic shared link, then we need to discard all
893 PC relative relocs against symbols defined in a regular object.
894 We allocated space for them in the check_relocs routine, but we
895 will not fill them in in the relocate_section routine. */
896 if (info
->shared
&& info
->symbolic
)
897 elf_i386_link_hash_traverse (elf_i386_hash_table (info
),
898 elf_i386_discard_copies
,
901 /* The check_relocs and adjust_dynamic_symbol entry points have
902 determined the sizes of the various dynamic sections. Allocate
907 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
912 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
915 /* It's OK to base decisions on the section name, because none
916 of the dynobj section names depend upon the input files. */
917 name
= bfd_get_section_name (dynobj
, s
);
921 if (strcmp (name
, ".plt") == 0)
923 if (s
->_raw_size
== 0)
925 /* Strip this section if we don't need it; see the
931 /* Remember whether there is a PLT. */
935 else if (strncmp (name
, ".rel", 4) == 0)
937 if (s
->_raw_size
== 0)
939 /* If we don't need this section, strip it from the
940 output file. This is mostly to handle .rel.bss and
941 .rel.plt. We must create both sections in
942 create_dynamic_sections, because they must be created
943 before the linker maps input sections to output
944 sections. The linker does that before
945 adjust_dynamic_symbol is called, and it is that
946 function which decides whether anything needs to go
947 into these sections. */
954 /* Remember whether there are any reloc sections other
956 if (strcmp (name
, ".rel.plt") != 0)
962 /* If this relocation section applies to a read only
963 section, then we probably need a DT_TEXTREL
964 entry. The entries in the .rel.plt section
965 really apply to the .got section, which we
966 created ourselves and so know is not readonly. */
967 outname
= bfd_get_section_name (output_bfd
,
969 target
= bfd_get_section_by_name (output_bfd
, outname
+ 4);
971 && (target
->flags
& SEC_READONLY
) != 0)
975 /* We use the reloc_count field as a counter if we need
976 to copy relocs into the output file. */
980 else if (strncmp (name
, ".got", 4) != 0)
982 /* It's not one of our sections, so don't allocate space. */
990 for (spp
= &s
->output_section
->owner
->sections
;
991 *spp
!= s
->output_section
;
994 *spp
= s
->output_section
->next
;
995 --s
->output_section
->owner
->section_count
;
1000 /* Allocate memory for the section contents. */
1001 s
->contents
= (bfd_byte
*) bfd_alloc (dynobj
, s
->_raw_size
);
1002 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1006 if (elf_hash_table (info
)->dynamic_sections_created
)
1008 /* Add some entries to the .dynamic section. We fill in the
1009 values later, in elf_i386_finish_dynamic_sections, but we
1010 must add the entries now so that we get the correct size for
1011 the .dynamic section. The DT_DEBUG entry is filled in by the
1012 dynamic linker and used by the debugger. */
1015 if (! bfd_elf32_add_dynamic_entry (info
, DT_DEBUG
, 0))
1021 if (! bfd_elf32_add_dynamic_entry (info
, DT_PLTGOT
, 0)
1022 || ! bfd_elf32_add_dynamic_entry (info
, DT_PLTRELSZ
, 0)
1023 || ! bfd_elf32_add_dynamic_entry (info
, DT_PLTREL
, DT_REL
)
1024 || ! bfd_elf32_add_dynamic_entry (info
, DT_JMPREL
, 0))
1030 if (! bfd_elf32_add_dynamic_entry (info
, DT_REL
, 0)
1031 || ! bfd_elf32_add_dynamic_entry (info
, DT_RELSZ
, 0)
1032 || ! bfd_elf32_add_dynamic_entry (info
, DT_RELENT
,
1033 sizeof (Elf32_External_Rel
)))
1039 if (! bfd_elf32_add_dynamic_entry (info
, DT_TEXTREL
, 0))
1047 /* This function is called via elf_i386_link_hash_traverse if we are
1048 creating a shared object with -Bsymbolic. It discards the space
1049 allocated to copy PC relative relocs against symbols which are
1050 defined in regular objects. We allocated space for them in the
1051 check_relocs routine, but we won't fill them in in the
1052 relocate_section routine. */
1056 elf_i386_discard_copies (h
, ignore
)
1057 struct elf_i386_link_hash_entry
*h
;
1060 struct elf_i386_pcrel_relocs_copied
*s
;
1062 /* We only discard relocs for symbols defined in a regular object. */
1063 if ((h
->root
.elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1066 for (s
= h
->pcrel_relocs_copied
; s
!= NULL
; s
= s
->next
)
1067 s
->section
->_raw_size
-= s
->count
* sizeof (Elf32_External_Rel
);
1072 /* Relocate an i386 ELF section. */
1075 elf_i386_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
1076 contents
, relocs
, local_syms
, local_sections
)
1078 struct bfd_link_info
*info
;
1080 asection
*input_section
;
1082 Elf_Internal_Rela
*relocs
;
1083 Elf_Internal_Sym
*local_syms
;
1084 asection
**local_sections
;
1087 Elf_Internal_Shdr
*symtab_hdr
;
1088 struct elf_link_hash_entry
**sym_hashes
;
1089 bfd_vma
*local_got_offsets
;
1093 Elf_Internal_Rela
*rel
;
1094 Elf_Internal_Rela
*relend
;
1096 dynobj
= elf_hash_table (info
)->dynobj
;
1097 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1098 sym_hashes
= elf_sym_hashes (input_bfd
);
1099 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1106 relend
= relocs
+ input_section
->reloc_count
;
1107 for (; rel
< relend
; rel
++)
1110 reloc_howto_type
*howto
;
1111 unsigned long r_symndx
;
1112 struct elf_link_hash_entry
*h
;
1113 Elf_Internal_Sym
*sym
;
1116 bfd_reloc_status_type r
;
1118 r_type
= ELF32_R_TYPE (rel
->r_info
);
1120 || r_type
>= (int) R_386_max
1121 || (r_type
>= (int) FIRST_INVALID_RELOC
1122 && r_type
<= (int) LAST_INVALID_RELOC
))
1124 bfd_set_error (bfd_error_bad_value
);
1127 howto
= elf_howto_table
+ r_type
;
1129 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1131 if (info
->relocateable
)
1133 /* This is a relocateable link. We don't have to change
1134 anything, unless the reloc is against a section symbol,
1135 in which case we have to adjust according to where the
1136 section symbol winds up in the output section. */
1137 if (r_symndx
< symtab_hdr
->sh_info
)
1139 sym
= local_syms
+ r_symndx
;
1140 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1144 sec
= local_sections
[r_symndx
];
1145 val
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
1146 val
+= sec
->output_offset
+ sym
->st_value
;
1147 bfd_put_32 (input_bfd
, val
, contents
+ rel
->r_offset
);
1154 /* This is a final link. */
1158 if (r_symndx
< symtab_hdr
->sh_info
)
1160 sym
= local_syms
+ r_symndx
;
1161 sec
= local_sections
[r_symndx
];
1162 relocation
= (sec
->output_section
->vma
1163 + sec
->output_offset
1168 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1169 while (h
->root
.type
== bfd_link_hash_indirect
1170 || h
->root
.type
== bfd_link_hash_warning
)
1171 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1172 if (h
->root
.type
== bfd_link_hash_defined
1173 || h
->root
.type
== bfd_link_hash_defweak
)
1175 sec
= h
->root
.u
.def
.section
;
1176 if (r_type
== R_386_GOTPC
1177 || (r_type
== R_386_PLT32
1178 && h
->plt_offset
!= (bfd_vma
) -1)
1179 || (r_type
== R_386_GOT32
1180 && elf_hash_table (info
)->dynamic_sections_created
1182 || (! info
->symbolic
&& h
->dynindx
!= -1)
1183 || (h
->elf_link_hash_flags
1184 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
1186 && ((! info
->symbolic
&& h
->dynindx
!= -1)
1187 || (h
->elf_link_hash_flags
1188 & ELF_LINK_HASH_DEF_REGULAR
) == 0)
1189 && (r_type
== R_386_32
1190 || r_type
== R_386_PC32
)
1191 && (input_section
->flags
& SEC_ALLOC
) != 0))
1193 /* In these cases, we don't need the relocation
1194 value. We check specially because in some
1195 obscure cases sec->output_section will be NULL. */
1198 else if (sec
->output_section
== NULL
)
1200 (*_bfd_error_handler
)
1201 ("%s: warning: unresolvable relocation against symbol `%s' from %s section",
1202 bfd_get_filename (input_bfd
), h
->root
.root
.string
,
1203 bfd_get_section_name (input_bfd
, input_section
));
1207 relocation
= (h
->root
.u
.def
.value
1208 + sec
->output_section
->vma
1209 + sec
->output_offset
);
1211 else if (h
->root
.type
== bfd_link_hash_undefweak
)
1213 else if (info
->shared
&& !info
->symbolic
)
1217 if (! ((*info
->callbacks
->undefined_symbol
)
1218 (info
, h
->root
.root
.string
, input_bfd
,
1219 input_section
, rel
->r_offset
)))
1228 /* Relocation is to the entry for this symbol in the global
1232 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1233 BFD_ASSERT (sgot
!= NULL
);
1240 off
= h
->got_offset
;
1241 BFD_ASSERT (off
!= (bfd_vma
) -1);
1243 if (! elf_hash_table (info
)->dynamic_sections_created
1245 && (info
->symbolic
|| h
->dynindx
== -1)
1246 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
1248 /* This is actually a static link, or it is a
1249 -Bsymbolic link and the symbol is defined
1250 locally, or the symbol was forced to be local
1251 because of a version file. We must initialize
1252 this entry in the global offset table. Since the
1253 offset must always be a multiple of 4, we use the
1254 least significant bit to record whether we have
1255 initialized it already.
1257 When doing a dynamic link, we create a .rel.got
1258 relocation entry to initialize the value. This
1259 is done in the finish_dynamic_symbol routine. */
1264 bfd_put_32 (output_bfd
, relocation
,
1265 sgot
->contents
+ off
);
1270 relocation
= sgot
->output_offset
+ off
;
1276 BFD_ASSERT (local_got_offsets
!= NULL
1277 && local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
1279 off
= local_got_offsets
[r_symndx
];
1281 /* The offset must always be a multiple of 4. We use
1282 the least significant bit to record whether we have
1283 already generated the necessary reloc. */
1288 bfd_put_32 (output_bfd
, relocation
, sgot
->contents
+ off
);
1293 Elf_Internal_Rel outrel
;
1295 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
1296 BFD_ASSERT (srelgot
!= NULL
);
1298 outrel
.r_offset
= (sgot
->output_section
->vma
1299 + sgot
->output_offset
1301 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
1302 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1303 (((Elf32_External_Rel
*)
1305 + srelgot
->reloc_count
));
1306 ++srelgot
->reloc_count
;
1309 local_got_offsets
[r_symndx
] |= 1;
1312 relocation
= sgot
->output_offset
+ off
;
1318 /* Relocation is relative to the start of the global offset
1323 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1324 BFD_ASSERT (sgot
!= NULL
);
1327 /* Note that sgot->output_offset is not involved in this
1328 calculation. We always want the start of .got. If we
1329 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1330 permitted by the ABI, we might have to change this
1332 relocation
-= sgot
->output_section
->vma
;
1337 /* Use global offset table as symbol value. */
1341 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1342 BFD_ASSERT (sgot
!= NULL
);
1345 relocation
= sgot
->output_section
->vma
;
1350 /* Relocation is to the entry for this symbol in the
1351 procedure linkage table. */
1353 /* Resolve a PLT32 reloc again a local symbol directly,
1354 without using the procedure linkage table. */
1358 if (h
->plt_offset
== (bfd_vma
) -1)
1360 /* We didn't make a PLT entry for this symbol. This
1361 happens when statically linking PIC code, or when
1362 using -Bsymbolic. */
1368 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1369 BFD_ASSERT (splt
!= NULL
);
1372 relocation
= (splt
->output_section
->vma
1373 + splt
->output_offset
1381 && (r_type
!= R_386_PC32
1383 && (! info
->symbolic
1384 || (h
->elf_link_hash_flags
1385 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
1387 Elf_Internal_Rel outrel
;
1388 boolean skip
, relocate
;
1390 /* When generating a shared object, these relocations
1391 are copied into the output file to be resolved at run
1398 name
= (bfd_elf_string_from_elf_section
1400 elf_elfheader (input_bfd
)->e_shstrndx
,
1401 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1405 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
1406 && strcmp (bfd_get_section_name (input_bfd
,
1410 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1411 BFD_ASSERT (sreloc
!= NULL
);
1416 if (elf_section_data (input_section
)->stab_info
== NULL
)
1417 outrel
.r_offset
= rel
->r_offset
;
1422 off
= (_bfd_stab_section_offset
1423 (output_bfd
, &elf_hash_table (info
)->stab_info
,
1425 &elf_section_data (input_section
)->stab_info
,
1427 if (off
== (bfd_vma
) -1)
1429 outrel
.r_offset
= off
;
1432 outrel
.r_offset
+= (input_section
->output_section
->vma
1433 + input_section
->output_offset
);
1437 memset (&outrel
, 0, sizeof outrel
);
1440 else if (r_type
== R_386_PC32
)
1442 BFD_ASSERT (h
!= NULL
&& h
->dynindx
!= -1);
1443 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1447 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_PC32
);
1451 /* h->dynindx may be -1 if this symbol was marked to
1454 || ((info
->symbolic
|| h
->dynindx
== -1)
1455 && (h
->elf_link_hash_flags
1456 & ELF_LINK_HASH_DEF_REGULAR
) != 0))
1459 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
1463 BFD_ASSERT (h
->dynindx
!= -1);
1464 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1468 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_32
);
1472 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1473 (((Elf32_External_Rel
*)
1475 + sreloc
->reloc_count
));
1476 ++sreloc
->reloc_count
;
1478 /* If this reloc is against an external symbol, we do
1479 not want to fiddle with the addend. Otherwise, we
1480 need to include the symbol value so that it becomes
1481 an addend for the dynamic reloc. */
1492 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1493 contents
, rel
->r_offset
,
1494 relocation
, (bfd_vma
) 0);
1496 if (r
!= bfd_reloc_ok
)
1501 case bfd_reloc_outofrange
:
1503 case bfd_reloc_overflow
:
1508 name
= h
->root
.root
.string
;
1511 name
= bfd_elf_string_from_elf_section (input_bfd
,
1512 symtab_hdr
->sh_link
,
1517 name
= bfd_section_name (input_bfd
, sec
);
1519 if (! ((*info
->callbacks
->reloc_overflow
)
1520 (info
, name
, howto
->name
, (bfd_vma
) 0,
1521 input_bfd
, input_section
, rel
->r_offset
)))
1532 /* Finish up dynamic symbol handling. We set the contents of various
1533 dynamic sections here. */
1536 elf_i386_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
1538 struct bfd_link_info
*info
;
1539 struct elf_link_hash_entry
*h
;
1540 Elf_Internal_Sym
*sym
;
1544 dynobj
= elf_hash_table (info
)->dynobj
;
1546 if (h
->plt_offset
!= (bfd_vma
) -1)
1553 Elf_Internal_Rel rel
;
1555 /* This symbol has an entry in the procedure linkage table. Set
1558 BFD_ASSERT (h
->dynindx
!= -1);
1560 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1561 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
1562 srel
= bfd_get_section_by_name (dynobj
, ".rel.plt");
1563 BFD_ASSERT (splt
!= NULL
&& sgot
!= NULL
&& srel
!= NULL
);
1565 /* Get the index in the procedure linkage table which
1566 corresponds to this symbol. This is the index of this symbol
1567 in all the symbols for which we are making plt entries. The
1568 first entry in the procedure linkage table is reserved. */
1569 plt_index
= h
->plt_offset
/ PLT_ENTRY_SIZE
- 1;
1571 /* Get the offset into the .got table of the entry that
1572 corresponds to this function. Each .got entry is 4 bytes.
1573 The first three are reserved. */
1574 got_offset
= (plt_index
+ 3) * 4;
1576 /* Fill in the entry in the procedure linkage table. */
1579 memcpy (splt
->contents
+ h
->plt_offset
, elf_i386_plt_entry
,
1581 bfd_put_32 (output_bfd
,
1582 (sgot
->output_section
->vma
1583 + sgot
->output_offset
1585 splt
->contents
+ h
->plt_offset
+ 2);
1589 memcpy (splt
->contents
+ h
->plt_offset
, elf_i386_pic_plt_entry
,
1591 bfd_put_32 (output_bfd
, got_offset
,
1592 splt
->contents
+ h
->plt_offset
+ 2);
1595 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
1596 splt
->contents
+ h
->plt_offset
+ 7);
1597 bfd_put_32 (output_bfd
, - (h
->plt_offset
+ PLT_ENTRY_SIZE
),
1598 splt
->contents
+ h
->plt_offset
+ 12);
1600 /* Fill in the entry in the global offset table. */
1601 bfd_put_32 (output_bfd
,
1602 (splt
->output_section
->vma
1603 + splt
->output_offset
1606 sgot
->contents
+ got_offset
);
1608 /* Fill in the entry in the .rel.plt section. */
1609 rel
.r_offset
= (sgot
->output_section
->vma
1610 + sgot
->output_offset
1612 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
1613 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
1614 ((Elf32_External_Rel
*) srel
->contents
1617 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1619 /* Mark the symbol as undefined, rather than as defined in
1620 the .plt section. Leave the value alone. */
1621 sym
->st_shndx
= SHN_UNDEF
;
1625 if (h
->got_offset
!= (bfd_vma
) -1)
1629 Elf_Internal_Rel rel
;
1631 /* This symbol has an entry in the global offset table. Set it
1634 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1635 srel
= bfd_get_section_by_name (dynobj
, ".rel.got");
1636 BFD_ASSERT (sgot
!= NULL
&& srel
!= NULL
);
1638 rel
.r_offset
= (sgot
->output_section
->vma
1639 + sgot
->output_offset
1640 + (h
->got_offset
&~ 1));
1642 /* If this is a -Bsymbolic link, and the symbol is defined
1643 locally, we just want to emit a RELATIVE reloc. Likewise if
1644 the symbol was forced to be local because of a version file.
1645 The entry in the global offset table will already have been
1646 initialized in the relocate_section function. */
1648 && (info
->symbolic
|| h
->dynindx
== -1)
1649 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
))
1650 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
1653 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got_offset
);
1654 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
1657 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
1658 ((Elf32_External_Rel
*) srel
->contents
1659 + srel
->reloc_count
));
1660 ++srel
->reloc_count
;
1663 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
1666 Elf_Internal_Rel rel
;
1668 /* This symbol needs a copy reloc. Set it up. */
1670 BFD_ASSERT (h
->dynindx
!= -1
1671 && (h
->root
.type
== bfd_link_hash_defined
1672 || h
->root
.type
== bfd_link_hash_defweak
));
1674 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
1676 BFD_ASSERT (s
!= NULL
);
1678 rel
.r_offset
= (h
->root
.u
.def
.value
1679 + h
->root
.u
.def
.section
->output_section
->vma
1680 + h
->root
.u
.def
.section
->output_offset
);
1681 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
1682 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
1683 ((Elf32_External_Rel
*) s
->contents
1688 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1689 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
1690 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
1691 sym
->st_shndx
= SHN_ABS
;
1696 /* Finish up the dynamic sections. */
1699 elf_i386_finish_dynamic_sections (output_bfd
, info
)
1701 struct bfd_link_info
*info
;
1707 dynobj
= elf_hash_table (info
)->dynobj
;
1709 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
1710 BFD_ASSERT (sgot
!= NULL
);
1711 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
1713 if (elf_hash_table (info
)->dynamic_sections_created
)
1716 Elf32_External_Dyn
*dyncon
, *dynconend
;
1718 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1719 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
1721 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
1722 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
1723 for (; dyncon
< dynconend
; dyncon
++)
1725 Elf_Internal_Dyn dyn
;
1729 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
1742 s
= bfd_get_section_by_name (output_bfd
, name
);
1743 BFD_ASSERT (s
!= NULL
);
1744 dyn
.d_un
.d_ptr
= s
->vma
;
1745 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
1749 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
1750 BFD_ASSERT (s
!= NULL
);
1751 if (s
->_cooked_size
!= 0)
1752 dyn
.d_un
.d_val
= s
->_cooked_size
;
1754 dyn
.d_un
.d_val
= s
->_raw_size
;
1755 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
1759 /* My reading of the SVR4 ABI indicates that the
1760 procedure linkage table relocs (DT_JMPREL) should be
1761 included in the overall relocs (DT_REL). This is
1762 what Solaris does. However, UnixWare can not handle
1763 that case. Therefore, we override the DT_RELSZ entry
1764 here to make it not include the JMPREL relocs. Since
1765 the linker script arranges for .rel.plt to follow all
1766 other relocation sections, we don't have to worry
1767 about changing the DT_REL entry. */
1768 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
1771 if (s
->_cooked_size
!= 0)
1772 dyn
.d_un
.d_val
-= s
->_cooked_size
;
1774 dyn
.d_un
.d_val
-= s
->_raw_size
;
1776 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
1781 /* Fill in the first entry in the procedure linkage table. */
1782 if (splt
->_raw_size
> 0)
1785 memcpy (splt
->contents
, elf_i386_pic_plt0_entry
, PLT_ENTRY_SIZE
);
1788 memcpy (splt
->contents
, elf_i386_plt0_entry
, PLT_ENTRY_SIZE
);
1789 bfd_put_32 (output_bfd
,
1790 sgot
->output_section
->vma
+ sgot
->output_offset
+ 4,
1791 splt
->contents
+ 2);
1792 bfd_put_32 (output_bfd
,
1793 sgot
->output_section
->vma
+ sgot
->output_offset
+ 8,
1794 splt
->contents
+ 8);
1798 /* UnixWare sets the entsize of .plt to 4, although that doesn't
1799 really seem like the right value. */
1800 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
= 4;
1803 /* Fill in the first three entries in the global offset table. */
1804 if (sgot
->_raw_size
> 0)
1807 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
1809 bfd_put_32 (output_bfd
,
1810 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
1812 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 4);
1813 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 8);
1816 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
1821 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
1822 #define TARGET_LITTLE_NAME "elf32-i386"
1823 #define ELF_ARCH bfd_arch_i386
1824 #define ELF_MACHINE_CODE EM_386
1825 #define ELF_MAXPAGESIZE 0x1000
1826 #define elf_info_to_howto elf_i386_info_to_howto
1827 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
1828 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
1829 #define bfd_elf32_bfd_is_local_label_name \
1830 elf_i386_is_local_label_name
1831 #define elf_backend_create_dynamic_sections \
1832 _bfd_elf_create_dynamic_sections
1833 #define bfd_elf32_bfd_link_hash_table_create \
1834 elf_i386_link_hash_table_create
1835 #define elf_backend_check_relocs elf_i386_check_relocs
1836 #define elf_backend_adjust_dynamic_symbol \
1837 elf_i386_adjust_dynamic_symbol
1838 #define elf_backend_size_dynamic_sections \
1839 elf_i386_size_dynamic_sections
1840 #define elf_backend_relocate_section elf_i386_relocate_section
1841 #define elf_backend_finish_dynamic_symbol \
1842 elf_i386_finish_dynamic_symbol
1843 #define elf_backend_finish_dynamic_sections \
1844 elf_i386_finish_dynamic_sections
1845 #define elf_backend_want_got_plt 1
1846 #define elf_backend_plt_readonly 1
1847 #define elf_backend_want_plt_sym 0
1849 #include "elf32-target.h"