1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
27 static reloc_howto_type
*elf_i386_reloc_type_lookup
28 PARAMS ((bfd
*, bfd_reloc_code_real_type
));
29 static void elf_i386_info_to_howto
30 PARAMS ((bfd
*, arelent
*, Elf32_Internal_Rela
*));
31 static void elf_i386_info_to_howto_rel
32 PARAMS ((bfd
*, arelent
*, Elf32_Internal_Rel
*));
33 static boolean elf_i386_is_local_label_name
34 PARAMS ((bfd
*, const char *));
35 static boolean elf_i386_grok_prstatus
36 PARAMS ((bfd
*abfd
, Elf_Internal_Note
*note
));
37 static boolean elf_i386_grok_psinfo
38 PARAMS ((bfd
*abfd
, Elf_Internal_Note
*note
));
39 static struct bfd_hash_entry
*link_hash_newfunc
40 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
41 static struct bfd_link_hash_table
*elf_i386_link_hash_table_create
43 static boolean create_got_section
44 PARAMS((bfd
*, struct bfd_link_info
*));
45 static boolean elf_i386_create_dynamic_sections
46 PARAMS((bfd
*, struct bfd_link_info
*));
47 static void elf_i386_copy_indirect_symbol
48 PARAMS ((struct elf_link_hash_entry
*, struct elf_link_hash_entry
*));
49 static boolean elf_i386_check_relocs
50 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
51 const Elf_Internal_Rela
*));
52 static asection
*elf_i386_gc_mark_hook
53 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
54 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
55 static boolean elf_i386_gc_sweep_hook
56 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
57 const Elf_Internal_Rela
*));
58 static boolean elf_i386_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
60 static boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static boolean elf_i386_fake_sections
65 PARAMS ((bfd
*, Elf32_Internal_Shdr
*, asection
*));
66 static boolean elf_i386_size_dynamic_sections
67 PARAMS ((bfd
*, struct bfd_link_info
*));
68 static boolean elf_i386_relocate_section
69 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
70 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
71 static boolean elf_i386_finish_dynamic_symbol
72 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
74 static enum elf_reloc_type_class elf_i386_reloc_type_class
75 PARAMS ((const Elf_Internal_Rela
*));
76 static boolean elf_i386_finish_dynamic_sections
77 PARAMS ((bfd
*, struct bfd_link_info
*));
79 #define USE_REL 1 /* 386 uses REL relocations instead of RELA */
83 static reloc_howto_type elf_howto_table
[]=
85 HOWTO(R_386_NONE
, 0, 0, 0, false, 0, complain_overflow_bitfield
,
86 bfd_elf_generic_reloc
, "R_386_NONE",
87 true, 0x00000000, 0x00000000, false),
88 HOWTO(R_386_32
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
89 bfd_elf_generic_reloc
, "R_386_32",
90 true, 0xffffffff, 0xffffffff, false),
91 HOWTO(R_386_PC32
, 0, 2, 32, true, 0, complain_overflow_bitfield
,
92 bfd_elf_generic_reloc
, "R_386_PC32",
93 true, 0xffffffff, 0xffffffff, true),
94 HOWTO(R_386_GOT32
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
95 bfd_elf_generic_reloc
, "R_386_GOT32",
96 true, 0xffffffff, 0xffffffff, false),
97 HOWTO(R_386_PLT32
, 0, 2, 32, true, 0, complain_overflow_bitfield
,
98 bfd_elf_generic_reloc
, "R_386_PLT32",
99 true, 0xffffffff, 0xffffffff, true),
100 HOWTO(R_386_COPY
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
101 bfd_elf_generic_reloc
, "R_386_COPY",
102 true, 0xffffffff, 0xffffffff, false),
103 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
104 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
105 true, 0xffffffff, 0xffffffff, false),
106 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
107 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
108 true, 0xffffffff, 0xffffffff, false),
109 HOWTO(R_386_RELATIVE
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
110 bfd_elf_generic_reloc
, "R_386_RELATIVE",
111 true, 0xffffffff, 0xffffffff, false),
112 HOWTO(R_386_GOTOFF
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
113 bfd_elf_generic_reloc
, "R_386_GOTOFF",
114 true, 0xffffffff, 0xffffffff, false),
115 HOWTO(R_386_GOTPC
, 0, 2, 32, true, 0, complain_overflow_bitfield
,
116 bfd_elf_generic_reloc
, "R_386_GOTPC",
117 true, 0xffffffff, 0xffffffff, true),
119 /* We have a gap in the reloc numbers here.
120 R_386_standard counts the number up to this point, and
121 R_386_ext_offset is the value to subtract from a reloc type of
122 R_386_16 thru R_386_PC8 to form an index into this table. */
123 #define R_386_standard ((unsigned int) R_386_GOTPC + 1)
124 #define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard)
126 /* The remaining relocs are a GNU extension. */
127 HOWTO(R_386_16
, 0, 1, 16, false, 0, complain_overflow_bitfield
,
128 bfd_elf_generic_reloc
, "R_386_16",
129 true, 0xffff, 0xffff, false),
130 HOWTO(R_386_PC16
, 0, 1, 16, true, 0, complain_overflow_bitfield
,
131 bfd_elf_generic_reloc
, "R_386_PC16",
132 true, 0xffff, 0xffff, true),
133 HOWTO(R_386_8
, 0, 0, 8, false, 0, complain_overflow_bitfield
,
134 bfd_elf_generic_reloc
, "R_386_8",
135 true, 0xff, 0xff, false),
136 HOWTO(R_386_PC8
, 0, 0, 8, true, 0, complain_overflow_signed
,
137 bfd_elf_generic_reloc
, "R_386_PC8",
138 true, 0xff, 0xff, true),
141 #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset)
142 #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext)
144 /* GNU extension to record C++ vtable hierarchy. */
145 HOWTO (R_386_GNU_VTINHERIT
, /* type */
147 2, /* size (0 = byte, 1 = short, 2 = long) */
149 false, /* pc_relative */
151 complain_overflow_dont
, /* complain_on_overflow */
152 NULL
, /* special_function */
153 "R_386_GNU_VTINHERIT", /* name */
154 false, /* partial_inplace */
159 /* GNU extension to record C++ vtable member usage. */
160 HOWTO (R_386_GNU_VTENTRY
, /* type */
162 2, /* size (0 = byte, 1 = short, 2 = long) */
164 false, /* pc_relative */
166 complain_overflow_dont
, /* complain_on_overflow */
167 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
168 "R_386_GNU_VTENTRY", /* name */
169 false, /* partial_inplace */
174 #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
178 #ifdef DEBUG_GEN_RELOC
179 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
184 static reloc_howto_type
*
185 elf_i386_reloc_type_lookup (abfd
, code
)
186 bfd
*abfd ATTRIBUTE_UNUSED
;
187 bfd_reloc_code_real_type code
;
192 TRACE ("BFD_RELOC_NONE");
193 return &elf_howto_table
[(unsigned int) R_386_NONE
];
196 TRACE ("BFD_RELOC_32");
197 return &elf_howto_table
[(unsigned int) R_386_32
];
200 TRACE ("BFD_RELOC_CTOR");
201 return &elf_howto_table
[(unsigned int) R_386_32
];
203 case BFD_RELOC_32_PCREL
:
204 TRACE ("BFD_RELOC_PC32");
205 return &elf_howto_table
[(unsigned int) R_386_PC32
];
207 case BFD_RELOC_386_GOT32
:
208 TRACE ("BFD_RELOC_386_GOT32");
209 return &elf_howto_table
[(unsigned int) R_386_GOT32
];
211 case BFD_RELOC_386_PLT32
:
212 TRACE ("BFD_RELOC_386_PLT32");
213 return &elf_howto_table
[(unsigned int) R_386_PLT32
];
215 case BFD_RELOC_386_COPY
:
216 TRACE ("BFD_RELOC_386_COPY");
217 return &elf_howto_table
[(unsigned int) R_386_COPY
];
219 case BFD_RELOC_386_GLOB_DAT
:
220 TRACE ("BFD_RELOC_386_GLOB_DAT");
221 return &elf_howto_table
[(unsigned int) R_386_GLOB_DAT
];
223 case BFD_RELOC_386_JUMP_SLOT
:
224 TRACE ("BFD_RELOC_386_JUMP_SLOT");
225 return &elf_howto_table
[(unsigned int) R_386_JUMP_SLOT
];
227 case BFD_RELOC_386_RELATIVE
:
228 TRACE ("BFD_RELOC_386_RELATIVE");
229 return &elf_howto_table
[(unsigned int) R_386_RELATIVE
];
231 case BFD_RELOC_386_GOTOFF
:
232 TRACE ("BFD_RELOC_386_GOTOFF");
233 return &elf_howto_table
[(unsigned int) R_386_GOTOFF
];
235 case BFD_RELOC_386_GOTPC
:
236 TRACE ("BFD_RELOC_386_GOTPC");
237 return &elf_howto_table
[(unsigned int) R_386_GOTPC
];
239 /* The remaining relocs are a GNU extension. */
241 TRACE ("BFD_RELOC_16");
242 return &elf_howto_table
[(unsigned int) R_386_16
- R_386_ext_offset
];
244 case BFD_RELOC_16_PCREL
:
245 TRACE ("BFD_RELOC_16_PCREL");
246 return &elf_howto_table
[(unsigned int) R_386_PC16
- R_386_ext_offset
];
249 TRACE ("BFD_RELOC_8");
250 return &elf_howto_table
[(unsigned int) R_386_8
- R_386_ext_offset
];
252 case BFD_RELOC_8_PCREL
:
253 TRACE ("BFD_RELOC_8_PCREL");
254 return &elf_howto_table
[(unsigned int) R_386_PC8
- R_386_ext_offset
];
256 case BFD_RELOC_VTABLE_INHERIT
:
257 TRACE ("BFD_RELOC_VTABLE_INHERIT");
258 return &elf_howto_table
[(unsigned int) R_386_GNU_VTINHERIT
261 case BFD_RELOC_VTABLE_ENTRY
:
262 TRACE ("BFD_RELOC_VTABLE_ENTRY");
263 return &elf_howto_table
[(unsigned int) R_386_GNU_VTENTRY
275 elf_i386_info_to_howto (abfd
, cache_ptr
, dst
)
276 bfd
*abfd ATTRIBUTE_UNUSED
;
277 arelent
*cache_ptr ATTRIBUTE_UNUSED
;
278 Elf32_Internal_Rela
*dst ATTRIBUTE_UNUSED
;
284 elf_i386_info_to_howto_rel (abfd
, cache_ptr
, dst
)
285 bfd
*abfd ATTRIBUTE_UNUSED
;
287 Elf32_Internal_Rel
*dst
;
289 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
292 if ((indx
= r_type
) >= R_386_standard
293 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
294 >= R_386_ext
- R_386_standard
)
295 && ((indx
= r_type
- R_386_vt_offset
) - R_386_ext
296 >= R_386_vt
- R_386_ext
))
298 (*_bfd_error_handler
) (_("%s: invalid relocation type %d"),
299 bfd_archive_filename (abfd
), (int) r_type
);
300 indx
= (unsigned int) R_386_NONE
;
302 cache_ptr
->howto
= &elf_howto_table
[indx
];
305 /* Return whether a symbol name implies a local label. The UnixWare
306 2.1 cc generates temporary symbols that start with .X, so we
307 recognize them here. FIXME: do other SVR4 compilers also use .X?.
308 If so, we should move the .X recognition into
309 _bfd_elf_is_local_label_name. */
312 elf_i386_is_local_label_name (abfd
, name
)
316 if (name
[0] == '.' && name
[1] == 'X')
319 return _bfd_elf_is_local_label_name (abfd
, name
);
322 /* Support for core dump NOTE sections. */
324 elf_i386_grok_prstatus (abfd
, note
)
326 Elf_Internal_Note
*note
;
331 switch (note
->descsz
)
336 case 144: /* Linux/i386 */
338 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
341 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
350 /* Make a ".reg/999" section. */
351 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
352 raw_size
, note
->descpos
+ offset
);
356 elf_i386_grok_psinfo (abfd
, note
)
358 Elf_Internal_Note
*note
;
360 switch (note
->descsz
)
365 case 124: /* Linux/i386 elf_prpsinfo */
366 elf_tdata (abfd
)->core_program
367 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
368 elf_tdata (abfd
)->core_command
369 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
372 /* Note that for some reason, a spurious space is tacked
373 onto the end of the args in some (at least one anyway)
374 implementations, so strip it off if it exists. */
377 char *command
= elf_tdata (abfd
)->core_command
;
378 int n
= strlen (command
);
380 if (0 < n
&& command
[n
- 1] == ' ')
381 command
[n
- 1] = '\0';
387 /* Functions for the i386 ELF linker.
389 In order to gain some understanding of code in this file without
390 knowing all the intricate details of the linker, note the
393 Functions named elf_i386_* are called by external routines, other
394 functions are only called locally. elf_i386_* functions appear
395 in this file more or less in the order in which they are called
396 from external routines. eg. elf_i386_check_relocs is called
397 early in the link process, elf_i386_finish_dynamic_sections is
398 one of the last functions. */
401 /* The name of the dynamic interpreter. This is put in the .interp
404 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
406 /* The size in bytes of an entry in the procedure linkage table. */
408 #define PLT_ENTRY_SIZE 16
410 /* The first entry in an absolute procedure linkage table looks like
411 this. See the SVR4 ABI i386 supplement to see how this works. */
413 static const bfd_byte elf_i386_plt0_entry
[PLT_ENTRY_SIZE
] =
415 0xff, 0x35, /* pushl contents of address */
416 0, 0, 0, 0, /* replaced with address of .got + 4. */
417 0xff, 0x25, /* jmp indirect */
418 0, 0, 0, 0, /* replaced with address of .got + 8. */
419 0, 0, 0, 0 /* pad out to 16 bytes. */
422 /* Subsequent entries in an absolute procedure linkage table look like
425 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
427 0xff, 0x25, /* jmp indirect */
428 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
429 0x68, /* pushl immediate */
430 0, 0, 0, 0, /* replaced with offset into relocation table. */
431 0xe9, /* jmp relative */
432 0, 0, 0, 0 /* replaced with offset to start of .plt. */
435 /* The first entry in a PIC procedure linkage table look like this. */
437 static const bfd_byte elf_i386_pic_plt0_entry
[PLT_ENTRY_SIZE
] =
439 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
440 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
441 0, 0, 0, 0 /* pad out to 16 bytes. */
444 /* Subsequent entries in a PIC procedure linkage table look like this. */
446 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
448 0xff, 0xa3, /* jmp *offset(%ebx) */
449 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
450 0x68, /* pushl immediate */
451 0, 0, 0, 0, /* replaced with offset into relocation table. */
452 0xe9, /* jmp relative */
453 0, 0, 0, 0 /* replaced with offset to start of .plt. */
456 /* The i386 linker needs to keep track of the number of relocs that it
457 decides to copy as dynamic relocs in check_relocs for each symbol.
458 This is so that it can later discard them if they are found to be
459 unnecessary. We store the information in a field extending the
460 regular ELF linker hash table. */
462 struct elf_i386_dyn_relocs
464 struct elf_i386_dyn_relocs
*next
;
466 /* The input section of the reloc. */
469 /* Total number of relocs copied for the input section. */
472 /* Number of pc-relative relocs copied for the input section. */
473 bfd_size_type pc_count
;
476 /* i386 ELF linker hash entry. */
478 struct elf_i386_link_hash_entry
480 struct elf_link_hash_entry elf
;
482 /* Track dynamic relocs copied for this symbol. */
483 struct elf_i386_dyn_relocs
*dyn_relocs
;
486 /* i386 ELF linker hash table. */
488 struct elf_i386_link_hash_table
490 struct elf_link_hash_table elf
;
492 /* Short-cuts to get to dynamic linker sections. */
501 /* Small local sym to section mapping cache. */
502 struct sym_sec_cache sym_sec
;
505 /* Get the i386 ELF linker hash table from a link_info structure. */
507 #define elf_i386_hash_table(p) \
508 ((struct elf_i386_link_hash_table *) ((p)->hash))
510 /* Create an entry in an i386 ELF linker hash table. */
512 static struct bfd_hash_entry
*
513 link_hash_newfunc (entry
, table
, string
)
514 struct bfd_hash_entry
*entry
;
515 struct bfd_hash_table
*table
;
518 /* Allocate the structure if it has not already been allocated by a
522 entry
= bfd_hash_allocate (table
,
523 sizeof (struct elf_i386_link_hash_entry
));
528 /* Call the allocation method of the superclass. */
529 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
532 struct elf_i386_link_hash_entry
*eh
;
534 eh
= (struct elf_i386_link_hash_entry
*) entry
;
535 eh
->dyn_relocs
= NULL
;
541 /* Create an i386 ELF linker hash table. */
543 static struct bfd_link_hash_table
*
544 elf_i386_link_hash_table_create (abfd
)
547 struct elf_i386_link_hash_table
*ret
;
548 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
550 ret
= (struct elf_i386_link_hash_table
*) bfd_malloc (amt
);
554 if (! _bfd_elf_link_hash_table_init (&ret
->elf
, abfd
, link_hash_newfunc
))
567 ret
->sym_sec
.abfd
= NULL
;
569 return &ret
->elf
.root
;
572 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
573 shortcuts to them in our hash table. */
576 create_got_section (dynobj
, info
)
578 struct bfd_link_info
*info
;
580 struct elf_i386_link_hash_table
*htab
;
582 if (! _bfd_elf_create_got_section (dynobj
, info
))
585 htab
= elf_i386_hash_table (info
);
586 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
587 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
588 if (!htab
->sgot
|| !htab
->sgotplt
)
591 htab
->srelgot
= bfd_make_section (dynobj
, ".rel.got");
592 if (htab
->srelgot
== NULL
593 || ! bfd_set_section_flags (dynobj
, htab
->srelgot
,
594 (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
595 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
597 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
602 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
603 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
607 elf_i386_create_dynamic_sections (dynobj
, info
)
609 struct bfd_link_info
*info
;
611 struct elf_i386_link_hash_table
*htab
;
613 htab
= elf_i386_hash_table (info
);
614 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
617 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
620 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
621 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
622 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
624 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
626 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
627 || (!info
->shared
&& !htab
->srelbss
))
633 /* Copy the extra info we tack onto an elf_link_hash_entry. */
636 elf_i386_copy_indirect_symbol (dir
, ind
)
637 struct elf_link_hash_entry
*dir
, *ind
;
639 struct elf_i386_link_hash_entry
*edir
, *eind
;
641 edir
= (struct elf_i386_link_hash_entry
*) dir
;
642 eind
= (struct elf_i386_link_hash_entry
*) ind
;
644 if (eind
->dyn_relocs
!= NULL
)
646 if (edir
->dyn_relocs
!= NULL
)
648 struct elf_i386_dyn_relocs
**pp
;
649 struct elf_i386_dyn_relocs
*p
;
651 if (ind
->root
.type
== bfd_link_hash_indirect
)
654 /* Add reloc counts against the weak sym to the strong sym
655 list. Merge any entries against the same section. */
656 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
658 struct elf_i386_dyn_relocs
*q
;
660 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
661 if (q
->sec
== p
->sec
)
663 q
->pc_count
+= p
->pc_count
;
664 q
->count
+= p
->count
;
671 *pp
= edir
->dyn_relocs
;
674 edir
->dyn_relocs
= eind
->dyn_relocs
;
675 eind
->dyn_relocs
= NULL
;
678 _bfd_elf_link_hash_copy_indirect (dir
, ind
);
681 /* Look through the relocs for a section during the first phase, and
682 calculate needed space in the global offset table, procedure linkage
683 table, and dynamic reloc sections. */
686 elf_i386_check_relocs (abfd
, info
, sec
, relocs
)
688 struct bfd_link_info
*info
;
690 const Elf_Internal_Rela
*relocs
;
692 struct elf_i386_link_hash_table
*htab
;
693 Elf_Internal_Shdr
*symtab_hdr
;
694 struct elf_link_hash_entry
**sym_hashes
;
695 const Elf_Internal_Rela
*rel
;
696 const Elf_Internal_Rela
*rel_end
;
699 if (info
->relocateable
)
702 htab
= elf_i386_hash_table (info
);
703 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
704 sym_hashes
= elf_sym_hashes (abfd
);
708 rel_end
= relocs
+ sec
->reloc_count
;
709 for (rel
= relocs
; rel
< rel_end
; rel
++)
711 unsigned long r_symndx
;
712 struct elf_link_hash_entry
*h
;
714 r_symndx
= ELF32_R_SYM (rel
->r_info
);
716 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
718 (*_bfd_error_handler
) (_("%s: bad symbol index: %d"),
719 bfd_archive_filename (abfd
),
724 if (r_symndx
< symtab_hdr
->sh_info
)
727 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
729 switch (ELF32_R_TYPE (rel
->r_info
))
732 /* This symbol requires a global offset table entry. */
735 h
->got
.refcount
+= 1;
739 bfd_signed_vma
*local_got_refcounts
;
741 /* This is a global offset table entry for a local symbol. */
742 local_got_refcounts
= elf_local_got_refcounts (abfd
);
743 if (local_got_refcounts
== NULL
)
747 size
= symtab_hdr
->sh_info
;
748 size
*= sizeof (bfd_signed_vma
);
749 local_got_refcounts
= ((bfd_signed_vma
*)
750 bfd_zalloc (abfd
, size
));
751 if (local_got_refcounts
== NULL
)
753 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
755 local_got_refcounts
[r_symndx
] += 1;
761 if (htab
->sgot
== NULL
)
763 if (htab
->elf
.dynobj
== NULL
)
764 htab
->elf
.dynobj
= abfd
;
765 if (!create_got_section (htab
->elf
.dynobj
, info
))
771 /* This symbol requires a procedure linkage table entry. We
772 actually build the entry in adjust_dynamic_symbol,
773 because this might be a case of linking PIC code which is
774 never referenced by a dynamic object, in which case we
775 don't need to generate a procedure linkage table entry
778 /* If this is a local symbol, we resolve it directly without
779 creating a procedure linkage table entry. */
783 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
784 h
->plt
.refcount
+= 1;
789 if (h
!= NULL
&& !info
->shared
)
791 /* If this reloc is in a read-only section, we might
792 need a copy reloc. We can't check reliably at this
793 stage whether the section is read-only, as input
794 sections have not yet been mapped to output sections.
795 Tentatively set the flag for now, and correct in
796 adjust_dynamic_symbol. */
797 h
->elf_link_hash_flags
|= ELF_LINK_NON_GOT_REF
;
799 /* We may need a .plt entry if the function this reloc
800 refers to is in a shared lib. */
801 h
->plt
.refcount
+= 1;
804 /* If we are creating a shared library, and this is a reloc
805 against a global symbol, or a non PC relative reloc
806 against a local symbol, then we need to copy the reloc
807 into the shared library. However, if we are linking with
808 -Bsymbolic, we do not need to copy a reloc against a
809 global symbol which is defined in an object we are
810 including in the link (i.e., DEF_REGULAR is set). At
811 this point we have not seen all the input files, so it is
812 possible that DEF_REGULAR is not set now but will be set
813 later (it is never cleared). In case of a weak definition,
814 DEF_REGULAR may be cleared later by a strong definition in
815 a shared library. We account for that possibility below by
816 storing information in the relocs_copied field of the hash
817 table entry. A similar situation occurs when creating
818 shared libraries and symbol visibility changes render the
821 If on the other hand, we are creating an executable, we
822 may need to keep relocations for symbols satisfied by a
823 dynamic library if we manage to avoid copy relocs for the
826 && (sec
->flags
& SEC_ALLOC
) != 0
827 && (ELF32_R_TYPE (rel
->r_info
) != R_386_PC32
830 || h
->root
.type
== bfd_link_hash_defweak
831 || (h
->elf_link_hash_flags
832 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
834 && (sec
->flags
& SEC_ALLOC
) != 0
836 && (h
->root
.type
== bfd_link_hash_defweak
837 || (h
->elf_link_hash_flags
838 & ELF_LINK_HASH_DEF_REGULAR
) == 0)))
840 struct elf_i386_dyn_relocs
*p
;
841 struct elf_i386_dyn_relocs
**head
;
843 /* We must copy these reloc types into the output file.
844 Create a reloc section in dynobj and make room for
850 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
851 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
853 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
857 if (strncmp (name
, ".rel", 4) != 0
858 || strcmp (bfd_get_section_name (abfd
, sec
),
861 (*_bfd_error_handler
)
862 (_("%s: bad relocation section name `%s\'"),
863 bfd_archive_filename (abfd
), name
);
866 if (htab
->elf
.dynobj
== NULL
)
867 htab
->elf
.dynobj
= abfd
;
869 dynobj
= htab
->elf
.dynobj
;
870 sreloc
= bfd_get_section_by_name (dynobj
, name
);
875 sreloc
= bfd_make_section (dynobj
, name
);
876 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
877 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
878 if ((sec
->flags
& SEC_ALLOC
) != 0)
879 flags
|= SEC_ALLOC
| SEC_LOAD
;
881 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
882 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
885 elf_section_data (sec
)->sreloc
= sreloc
;
888 /* If this is a global symbol, we count the number of
889 relocations we need for this symbol. */
892 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
896 /* Track dynamic relocs needed for local syms too.
897 We really need local syms available to do this
901 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
906 head
= ((struct elf_i386_dyn_relocs
**)
907 &elf_section_data (s
)->local_dynrel
);
911 if (p
== NULL
|| p
->sec
!= sec
)
913 bfd_size_type amt
= sizeof *p
;
914 p
= ((struct elf_i386_dyn_relocs
*)
915 bfd_alloc (htab
->elf
.dynobj
, amt
));
926 if (ELF32_R_TYPE (rel
->r_info
) == R_386_PC32
)
931 /* This relocation describes the C++ object vtable hierarchy.
932 Reconstruct it for later use during GC. */
933 case R_386_GNU_VTINHERIT
:
934 if (!_bfd_elf32_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
938 /* This relocation describes which C++ vtable entries are actually
939 used. Record for later use during GC. */
940 case R_386_GNU_VTENTRY
:
941 if (!_bfd_elf32_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
953 /* Return the section that should be marked against GC for a given
957 elf_i386_gc_mark_hook (abfd
, info
, rel
, h
, sym
)
959 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
960 Elf_Internal_Rela
*rel
;
961 struct elf_link_hash_entry
*h
;
962 Elf_Internal_Sym
*sym
;
966 switch (ELF32_R_TYPE (rel
->r_info
))
968 case R_386_GNU_VTINHERIT
:
969 case R_386_GNU_VTENTRY
:
973 switch (h
->root
.type
)
975 case bfd_link_hash_defined
:
976 case bfd_link_hash_defweak
:
977 return h
->root
.u
.def
.section
;
979 case bfd_link_hash_common
:
980 return h
->root
.u
.c
.p
->section
;
989 return bfd_section_from_elf_index (abfd
, sym
->st_shndx
);
995 /* Update the got entry reference counts for the section being removed. */
998 elf_i386_gc_sweep_hook (abfd
, info
, sec
, relocs
)
1000 struct bfd_link_info
*info
;
1002 const Elf_Internal_Rela
*relocs
;
1004 Elf_Internal_Shdr
*symtab_hdr
;
1005 struct elf_link_hash_entry
**sym_hashes
;
1006 bfd_signed_vma
*local_got_refcounts
;
1007 const Elf_Internal_Rela
*rel
, *relend
;
1008 unsigned long r_symndx
;
1009 struct elf_link_hash_entry
*h
;
1011 elf_section_data (sec
)->local_dynrel
= NULL
;
1013 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1014 sym_hashes
= elf_sym_hashes (abfd
);
1015 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1017 relend
= relocs
+ sec
->reloc_count
;
1018 for (rel
= relocs
; rel
< relend
; rel
++)
1019 switch (ELF32_R_TYPE (rel
->r_info
))
1024 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1025 if (r_symndx
>= symtab_hdr
->sh_info
)
1027 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1028 if (h
->got
.refcount
> 0)
1029 h
->got
.refcount
-= 1;
1031 else if (local_got_refcounts
!= NULL
)
1033 if (local_got_refcounts
[r_symndx
] > 0)
1034 local_got_refcounts
[r_symndx
] -= 1;
1040 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1041 if (r_symndx
>= symtab_hdr
->sh_info
)
1043 struct elf_i386_link_hash_entry
*eh
;
1044 struct elf_i386_dyn_relocs
**pp
;
1045 struct elf_i386_dyn_relocs
*p
;
1047 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1049 if (!info
->shared
&& h
->plt
.refcount
> 0)
1050 h
->plt
.refcount
-= 1;
1052 eh
= (struct elf_i386_link_hash_entry
*) h
;
1054 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1057 if (ELF32_R_TYPE (rel
->r_info
) == R_386_PC32
)
1068 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1069 if (r_symndx
>= symtab_hdr
->sh_info
)
1071 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1072 if (h
->plt
.refcount
> 0)
1073 h
->plt
.refcount
-= 1;
1084 /* Adjust a symbol defined by a dynamic object and referenced by a
1085 regular object. The current definition is in some section of the
1086 dynamic object, but we're not including those sections. We have to
1087 change the definition to something the rest of the link can
1091 elf_i386_adjust_dynamic_symbol (info
, h
)
1092 struct bfd_link_info
*info
;
1093 struct elf_link_hash_entry
*h
;
1095 struct elf_i386_link_hash_table
*htab
;
1096 struct elf_i386_link_hash_entry
* eh
;
1097 struct elf_i386_dyn_relocs
*p
;
1099 unsigned int power_of_two
;
1101 /* If this is a function, put it in the procedure linkage table. We
1102 will fill in the contents of the procedure linkage table later,
1103 when we know the address of the .got section. */
1104 if (h
->type
== STT_FUNC
1105 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
1107 if (h
->plt
.refcount
<= 0
1109 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1110 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0
1111 && h
->root
.type
!= bfd_link_hash_undefweak
1112 && h
->root
.type
!= bfd_link_hash_undefined
))
1114 /* This case can occur if we saw a PLT32 reloc in an input
1115 file, but the symbol was never referred to by a dynamic
1116 object, or if all references were garbage collected. In
1117 such a case, we don't actually need to build a procedure
1118 linkage table, and we can just do a PC32 reloc instead. */
1119 h
->plt
.offset
= (bfd_vma
) -1;
1120 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1126 /* It's possible that we incorrectly decided a .plt reloc was
1127 needed for an R_386_PC32 reloc to a non-function sym in
1128 check_relocs. We can't decide accurately between function and
1129 non-function syms in check-relocs; Objects loaded later in
1130 the link may change h->type. So fix it now. */
1131 h
->plt
.offset
= (bfd_vma
) -1;
1133 /* If this is a weak symbol, and there is a real definition, the
1134 processor independent code will have arranged for us to see the
1135 real definition first, and we can just use the same value. */
1136 if (h
->weakdef
!= NULL
)
1138 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
1139 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
1140 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
1141 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
1145 /* This is a reference to a symbol defined by a dynamic object which
1146 is not a function. */
1148 /* If we are creating a shared library, we must presume that the
1149 only references to the symbol are via the global offset table.
1150 For such cases we need not do anything here; the relocations will
1151 be handled correctly by relocate_section. */
1155 /* If there are no references to this symbol that do not use the
1156 GOT, we don't need to generate a copy reloc. */
1157 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0)
1160 /* If -z nocopyreloc was given, we won't generate them either. */
1161 if (info
->nocopyreloc
)
1163 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_GOT_REF
;
1167 eh
= (struct elf_i386_link_hash_entry
*) h
;
1168 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1170 s
= p
->sec
->output_section
;
1171 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1175 /* If we didn't find any dynamic relocs in read-only sections, then
1176 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1179 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_GOT_REF
;
1183 /* We must allocate the symbol in our .dynbss section, which will
1184 become part of the .bss section of the executable. There will be
1185 an entry for this symbol in the .dynsym section. The dynamic
1186 object will contain position independent code, so all references
1187 from the dynamic object to this symbol will go through the global
1188 offset table. The dynamic linker will use the .dynsym entry to
1189 determine the address it must put in the global offset table, so
1190 both the dynamic object and the regular object will refer to the
1191 same memory location for the variable. */
1193 htab
= elf_i386_hash_table (info
);
1195 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1196 copy the initial value out of the dynamic object and into the
1197 runtime process image. */
1198 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
1200 htab
->srelbss
->_raw_size
+= sizeof (Elf32_External_Rel
);
1201 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
1204 /* We need to figure out the alignment required for this symbol. I
1205 have no idea how ELF linkers handle this. */
1206 power_of_two
= bfd_log2 (h
->size
);
1207 if (power_of_two
> 3)
1210 /* Apply the required alignment. */
1212 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
, (bfd_size_type
) (1 << power_of_two
));
1213 if (power_of_two
> bfd_get_section_alignment (htab
->elf
.dynobj
, s
))
1215 if (! bfd_set_section_alignment (htab
->elf
.dynobj
, s
, power_of_two
))
1219 /* Define the symbol as being at this point in the section. */
1220 h
->root
.u
.def
.section
= s
;
1221 h
->root
.u
.def
.value
= s
->_raw_size
;
1223 /* Increment the section size to make room for the symbol. */
1224 s
->_raw_size
+= h
->size
;
1229 /* This is the condition under which elf_i386_finish_dynamic_symbol
1230 will be called from elflink.h. If elflink.h doesn't call our
1231 finish_dynamic_symbol routine, we'll need to do something about
1232 initializing any .plt and .got entries in elf_i386_relocate_section. */
1233 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1235 && ((INFO)->shared \
1236 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1237 && ((H)->dynindx != -1 \
1238 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1240 /* Allocate space in .plt, .got and associated reloc sections for
1244 allocate_dynrelocs (h
, inf
)
1245 struct elf_link_hash_entry
*h
;
1248 struct bfd_link_info
*info
;
1249 struct elf_i386_link_hash_table
*htab
;
1250 struct elf_i386_link_hash_entry
*eh
;
1251 struct elf_i386_dyn_relocs
*p
;
1253 if (h
->root
.type
== bfd_link_hash_indirect
)
1256 if (h
->root
.type
== bfd_link_hash_warning
)
1257 /* When warning symbols are created, they **replace** the "real"
1258 entry in the hash table, thus we never get to see the real
1259 symbol in a hash traversal. So look at it now. */
1260 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1262 info
= (struct bfd_link_info
*) inf
;
1263 htab
= elf_i386_hash_table (info
);
1265 if (htab
->elf
.dynamic_sections_created
1266 && h
->plt
.refcount
> 0)
1268 /* Make sure this symbol is output as a dynamic symbol.
1269 Undefined weak syms won't yet be marked as dynamic. */
1270 if (h
->dynindx
== -1
1271 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1273 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1277 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info
, h
))
1279 asection
*s
= htab
->splt
;
1281 /* If this is the first .plt entry, make room for the special
1283 if (s
->_raw_size
== 0)
1284 s
->_raw_size
+= PLT_ENTRY_SIZE
;
1286 h
->plt
.offset
= s
->_raw_size
;
1288 /* If this symbol is not defined in a regular file, and we are
1289 not generating a shared library, then set the symbol to this
1290 location in the .plt. This is required to make function
1291 pointers compare as equal between the normal executable and
1292 the shared library. */
1294 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1296 h
->root
.u
.def
.section
= s
;
1297 h
->root
.u
.def
.value
= h
->plt
.offset
;
1300 /* Make room for this entry. */
1301 s
->_raw_size
+= PLT_ENTRY_SIZE
;
1303 /* We also need to make an entry in the .got.plt section, which
1304 will be placed in the .got section by the linker script. */
1305 htab
->sgotplt
->_raw_size
+= 4;
1307 /* We also need to make an entry in the .rel.plt section. */
1308 htab
->srelplt
->_raw_size
+= sizeof (Elf32_External_Rel
);
1312 h
->plt
.offset
= (bfd_vma
) -1;
1313 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1318 h
->plt
.offset
= (bfd_vma
) -1;
1319 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
1322 if (h
->got
.refcount
> 0)
1327 /* Make sure this symbol is output as a dynamic symbol.
1328 Undefined weak syms won't yet be marked as dynamic. */
1329 if (h
->dynindx
== -1
1330 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1332 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1337 h
->got
.offset
= s
->_raw_size
;
1339 dyn
= htab
->elf
.dynamic_sections_created
;
1340 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
, h
))
1341 htab
->srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
1344 h
->got
.offset
= (bfd_vma
) -1;
1346 eh
= (struct elf_i386_link_hash_entry
*) h
;
1347 if (eh
->dyn_relocs
== NULL
)
1350 /* In the shared -Bsymbolic case, discard space allocated for
1351 dynamic pc-relative relocs against symbols which turn out to be
1352 defined in regular objects. For the normal shared case, discard
1353 space for pc-relative relocs that have become local due to symbol
1354 visibility changes. */
1358 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1359 && ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0
1362 struct elf_i386_dyn_relocs
**pp
;
1364 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
1366 p
->count
-= p
->pc_count
;
1377 /* For the non-shared case, discard space for relocs against
1378 symbols which turn out to need copy relocs or are not
1381 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
1382 && (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1383 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1384 || (htab
->elf
.dynamic_sections_created
1385 && (h
->root
.type
== bfd_link_hash_undefweak
1386 || h
->root
.type
== bfd_link_hash_undefined
))))
1388 /* Make sure this symbol is output as a dynamic symbol.
1389 Undefined weak syms won't yet be marked as dynamic. */
1390 if (h
->dynindx
== -1
1391 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
1393 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
1397 /* If that succeeded, we know we'll be keeping all the
1399 if (h
->dynindx
!= -1)
1403 eh
->dyn_relocs
= NULL
;
1408 /* Finally, allocate space. */
1409 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1411 asection
*sreloc
= elf_section_data (p
->sec
)->sreloc
;
1412 sreloc
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
1418 /* Find any dynamic relocs that apply to read-only sections. */
1421 readonly_dynrelocs (h
, inf
)
1422 struct elf_link_hash_entry
*h
;
1425 struct elf_i386_link_hash_entry
*eh
;
1426 struct elf_i386_dyn_relocs
*p
;
1428 if (h
->root
.type
== bfd_link_hash_warning
)
1429 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1431 eh
= (struct elf_i386_link_hash_entry
*) h
;
1432 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
1434 asection
*s
= p
->sec
->output_section
;
1436 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
1438 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
1440 info
->flags
|= DF_TEXTREL
;
1442 /* Not an error, just cut short the traversal. */
1449 /* Set the sizes of the dynamic sections. */
1452 elf_i386_size_dynamic_sections (output_bfd
, info
)
1453 bfd
*output_bfd ATTRIBUTE_UNUSED
;
1454 struct bfd_link_info
*info
;
1456 struct elf_i386_link_hash_table
*htab
;
1462 htab
= elf_i386_hash_table (info
);
1463 dynobj
= htab
->elf
.dynobj
;
1467 if (htab
->elf
.dynamic_sections_created
)
1469 /* Set the contents of the .interp section to the interpreter. */
1472 s
= bfd_get_section_by_name (dynobj
, ".interp");
1475 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1476 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1480 /* Set up .got offsets for local syms, and space for local dynamic
1482 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
1484 bfd_signed_vma
*local_got
;
1485 bfd_signed_vma
*end_local_got
;
1486 bfd_size_type locsymcount
;
1487 Elf_Internal_Shdr
*symtab_hdr
;
1490 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
1493 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
1495 struct elf_i386_dyn_relocs
*p
;
1497 for (p
= *((struct elf_i386_dyn_relocs
**)
1498 &elf_section_data (s
)->local_dynrel
);
1502 if (!bfd_is_abs_section (p
->sec
)
1503 && bfd_is_abs_section (p
->sec
->output_section
))
1505 /* Input section has been discarded, either because
1506 it is a copy of a linkonce section or due to
1507 linker script /DISCARD/, so we'll be discarding
1510 else if (p
->count
!= 0)
1512 srel
= elf_section_data (p
->sec
)->sreloc
;
1513 srel
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
1514 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
1515 info
->flags
|= DF_TEXTREL
;
1520 local_got
= elf_local_got_refcounts (ibfd
);
1524 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
1525 locsymcount
= symtab_hdr
->sh_info
;
1526 end_local_got
= local_got
+ locsymcount
;
1528 srel
= htab
->srelgot
;
1529 for (; local_got
< end_local_got
; ++local_got
)
1533 *local_got
= s
->_raw_size
;
1536 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
1539 *local_got
= (bfd_vma
) -1;
1543 /* Allocate global sym .plt and .got entries, and space for global
1544 sym dynamic relocs. */
1545 elf_link_hash_traverse (&htab
->elf
, allocate_dynrelocs
, (PTR
) info
);
1547 /* We now have determined the sizes of the various dynamic sections.
1548 Allocate memory for them. */
1550 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1552 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1557 || s
== htab
->sgotplt
)
1559 /* Strip this section if we don't need it; see the
1562 else if (strncmp (bfd_get_section_name (dynobj
, s
), ".rel", 4) == 0)
1564 if (s
->_raw_size
!= 0 && s
!= htab
->srelplt
)
1567 /* We use the reloc_count field as a counter if we need
1568 to copy relocs into the output file. */
1573 /* It's not one of our sections, so don't allocate space. */
1577 if (s
->_raw_size
== 0)
1579 /* If we don't need this section, strip it from the
1580 output file. This is mostly to handle .rel.bss and
1581 .rel.plt. We must create both sections in
1582 create_dynamic_sections, because they must be created
1583 before the linker maps input sections to output
1584 sections. The linker does that before
1585 adjust_dynamic_symbol is called, and it is that
1586 function which decides whether anything needs to go
1587 into these sections. */
1589 _bfd_strip_section_from_output (info
, s
);
1593 /* Allocate memory for the section contents. We use bfd_zalloc
1594 here in case unused entries are not reclaimed before the
1595 section's contents are written out. This should not happen,
1596 but this way if it does, we get a R_386_NONE reloc instead
1598 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->_raw_size
);
1599 if (s
->contents
== NULL
)
1603 if (htab
->elf
.dynamic_sections_created
)
1605 /* Add some entries to the .dynamic section. We fill in the
1606 values later, in elf_i386_finish_dynamic_sections, but we
1607 must add the entries now so that we get the correct size for
1608 the .dynamic section. The DT_DEBUG entry is filled in by the
1609 dynamic linker and used by the debugger. */
1610 #define add_dynamic_entry(TAG, VAL) \
1611 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1615 if (!add_dynamic_entry (DT_DEBUG
, 0))
1619 if (htab
->splt
->_raw_size
!= 0)
1621 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1622 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1623 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
1624 || !add_dynamic_entry (DT_JMPREL
, 0))
1630 if (!add_dynamic_entry (DT_REL
, 0)
1631 || !add_dynamic_entry (DT_RELSZ
, 0)
1632 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
1635 /* If any dynamic relocs apply to a read-only section,
1636 then we need a DT_TEXTREL entry. */
1637 if ((info
->flags
& DF_TEXTREL
) == 0)
1638 elf_link_hash_traverse (&htab
->elf
, readonly_dynrelocs
,
1641 if ((info
->flags
& DF_TEXTREL
) != 0)
1643 if (!add_dynamic_entry (DT_TEXTREL
, 0))
1648 #undef add_dynamic_entry
1653 /* Set the correct type for an x86 ELF section. We do this by the
1654 section name, which is a hack, but ought to work. */
1657 elf_i386_fake_sections (abfd
, hdr
, sec
)
1658 bfd
*abfd ATTRIBUTE_UNUSED
;
1659 Elf32_Internal_Shdr
*hdr
;
1662 register const char *name
;
1664 name
= bfd_get_section_name (abfd
, sec
);
1666 /* This is an ugly, but unfortunately necessary hack that is
1667 needed when producing EFI binaries on x86. It tells
1668 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1669 containing ELF relocation info. We need this hack in order to
1670 be able to generate ELF binaries that can be translated into
1671 EFI applications (which are essentially COFF objects). Those
1672 files contain a COFF ".reloc" section inside an ELFNN object,
1673 which would normally cause BFD to segfault because it would
1674 attempt to interpret this section as containing relocation
1675 entries for section "oc". With this hack enabled, ".reloc"
1676 will be treated as a normal data section, which will avoid the
1677 segfault. However, you won't be able to create an ELFNN binary
1678 with a section named "oc" that needs relocations, but that's
1679 the kind of ugly side-effects you get when detecting section
1680 types based on their names... In practice, this limitation is
1681 unlikely to bite. */
1682 if (strcmp (name
, ".reloc") == 0)
1683 hdr
->sh_type
= SHT_PROGBITS
;
1688 /* Relocate an i386 ELF section. */
1691 elf_i386_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
1692 contents
, relocs
, local_syms
, local_sections
)
1694 struct bfd_link_info
*info
;
1696 asection
*input_section
;
1698 Elf_Internal_Rela
*relocs
;
1699 Elf_Internal_Sym
*local_syms
;
1700 asection
**local_sections
;
1702 struct elf_i386_link_hash_table
*htab
;
1703 Elf_Internal_Shdr
*symtab_hdr
;
1704 struct elf_link_hash_entry
**sym_hashes
;
1705 bfd_vma
*local_got_offsets
;
1706 Elf_Internal_Rela
*rel
;
1707 Elf_Internal_Rela
*relend
;
1709 htab
= elf_i386_hash_table (info
);
1710 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1711 sym_hashes
= elf_sym_hashes (input_bfd
);
1712 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1715 relend
= relocs
+ input_section
->reloc_count
;
1716 for (; rel
< relend
; rel
++)
1719 reloc_howto_type
*howto
;
1720 unsigned long r_symndx
;
1721 struct elf_link_hash_entry
*h
;
1722 Elf_Internal_Sym
*sym
;
1726 boolean unresolved_reloc
;
1727 bfd_reloc_status_type r
;
1730 r_type
= ELF32_R_TYPE (rel
->r_info
);
1731 if (r_type
== (int) R_386_GNU_VTINHERIT
1732 || r_type
== (int) R_386_GNU_VTENTRY
)
1735 if ((indx
= (unsigned) r_type
) >= R_386_standard
1736 && ((indx
= (unsigned) r_type
- R_386_ext_offset
) - R_386_standard
1737 >= R_386_ext
- R_386_standard
))
1739 bfd_set_error (bfd_error_bad_value
);
1742 howto
= elf_howto_table
+ indx
;
1744 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1746 if (info
->relocateable
)
1748 /* This is a relocatable link. We don't have to change
1749 anything, unless the reloc is against a section symbol,
1750 in which case we have to adjust according to where the
1751 section symbol winds up in the output section. */
1752 if (r_symndx
< symtab_hdr
->sh_info
)
1754 sym
= local_syms
+ r_symndx
;
1755 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1759 sec
= local_sections
[r_symndx
];
1760 val
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
1761 val
+= sec
->output_offset
+ sym
->st_value
;
1762 bfd_put_32 (input_bfd
, val
, contents
+ rel
->r_offset
);
1768 /* This is a final link. */
1772 unresolved_reloc
= false;
1773 if (r_symndx
< symtab_hdr
->sh_info
)
1775 sym
= local_syms
+ r_symndx
;
1776 sec
= local_sections
[r_symndx
];
1777 relocation
= (sec
->output_section
->vma
1778 + sec
->output_offset
1780 if ((sec
->flags
& SEC_MERGE
)
1781 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1786 if (howto
->src_mask
!= 0xffffffff)
1788 (*_bfd_error_handler
)
1789 (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"),
1790 bfd_archive_filename (input_bfd
),
1791 bfd_get_section_name (input_bfd
, input_section
),
1792 (long) rel
->r_offset
, howto
->name
);
1796 addend
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
1799 _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
)
1801 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
1802 bfd_put_32 (input_bfd
, addend
, contents
+ rel
->r_offset
);
1807 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1808 while (h
->root
.type
== bfd_link_hash_indirect
1809 || h
->root
.type
== bfd_link_hash_warning
)
1810 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1813 if (h
->root
.type
== bfd_link_hash_defined
1814 || h
->root
.type
== bfd_link_hash_defweak
)
1816 sec
= h
->root
.u
.def
.section
;
1817 if (sec
->output_section
== NULL
)
1818 /* Set a flag that will be cleared later if we find a
1819 relocation value for this symbol. output_section
1820 is typically NULL for symbols satisfied by a shared
1822 unresolved_reloc
= true;
1824 relocation
= (h
->root
.u
.def
.value
1825 + sec
->output_section
->vma
1826 + sec
->output_offset
);
1828 else if (h
->root
.type
== bfd_link_hash_undefweak
)
1830 else if (info
->shared
1831 && (!info
->symbolic
|| info
->allow_shlib_undefined
)
1832 && !info
->no_undefined
1833 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
1837 if (! ((*info
->callbacks
->undefined_symbol
)
1838 (info
, h
->root
.root
.string
, input_bfd
,
1839 input_section
, rel
->r_offset
,
1840 (!info
->shared
|| info
->no_undefined
1841 || ELF_ST_VISIBILITY (h
->other
)))))
1849 /* Relocation is to the entry for this symbol in the global
1851 if (htab
->sgot
== NULL
)
1858 off
= h
->got
.offset
;
1859 dyn
= htab
->elf
.dynamic_sections_created
;
1860 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
, h
)
1864 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
))
1865 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
1867 /* This is actually a static link, or it is a
1868 -Bsymbolic link and the symbol is defined
1869 locally, or the symbol was forced to be local
1870 because of a version file. We must initialize
1871 this entry in the global offset table. Since the
1872 offset must always be a multiple of 4, we use the
1873 least significant bit to record whether we have
1874 initialized it already.
1876 When doing a dynamic link, we create a .rel.got
1877 relocation entry to initialize the value. This
1878 is done in the finish_dynamic_symbol routine. */
1883 bfd_put_32 (output_bfd
, relocation
,
1884 htab
->sgot
->contents
+ off
);
1889 unresolved_reloc
= false;
1893 if (local_got_offsets
== NULL
)
1896 off
= local_got_offsets
[r_symndx
];
1898 /* The offset must always be a multiple of 4. We use
1899 the least significant bit to record whether we have
1900 already generated the necessary reloc. */
1905 bfd_put_32 (output_bfd
, relocation
,
1906 htab
->sgot
->contents
+ off
);
1911 Elf_Internal_Rel outrel
;
1912 Elf32_External_Rel
*loc
;
1914 srelgot
= htab
->srelgot
;
1915 if (srelgot
== NULL
)
1918 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
1919 + htab
->sgot
->output_offset
1921 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
1922 loc
= (Elf32_External_Rel
*) srelgot
->contents
;
1923 loc
+= srelgot
->reloc_count
++;
1924 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
1927 local_got_offsets
[r_symndx
] |= 1;
1931 if (off
>= (bfd_vma
) -2)
1934 relocation
= htab
->sgot
->output_offset
+ off
;
1938 /* Relocation is relative to the start of the global offset
1941 /* Note that sgot->output_offset is not involved in this
1942 calculation. We always want the start of .got. If we
1943 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1944 permitted by the ABI, we might have to change this
1946 relocation
-= htab
->sgot
->output_section
->vma
;
1950 /* Use global offset table as symbol value. */
1951 relocation
= htab
->sgot
->output_section
->vma
;
1952 unresolved_reloc
= false;
1956 /* Relocation is to the entry for this symbol in the
1957 procedure linkage table. */
1959 /* Resolve a PLT32 reloc against a local symbol directly,
1960 without using the procedure linkage table. */
1964 if (h
->plt
.offset
== (bfd_vma
) -1
1965 || htab
->splt
== NULL
)
1967 /* We didn't make a PLT entry for this symbol. This
1968 happens when statically linking PIC code, or when
1969 using -Bsymbolic. */
1973 relocation
= (htab
->splt
->output_section
->vma
1974 + htab
->splt
->output_offset
1976 unresolved_reloc
= false;
1981 /* r_symndx will be zero only for relocs against symbols
1982 from removed linkonce sections, or sections discarded by
1985 || (input_section
->flags
& SEC_ALLOC
) == 0)
1989 && (r_type
!= R_386_PC32
1992 && (! info
->symbolic
1993 || (h
->elf_link_hash_flags
1994 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
1998 && (h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
1999 && (((h
->elf_link_hash_flags
2000 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2001 && (h
->elf_link_hash_flags
2002 & ELF_LINK_HASH_DEF_REGULAR
) == 0)
2003 || h
->root
.type
== bfd_link_hash_undefweak
2004 || h
->root
.type
== bfd_link_hash_undefined
)))
2006 Elf_Internal_Rel outrel
;
2007 boolean skip
, relocate
;
2009 Elf32_External_Rel
*loc
;
2011 /* When generating a shared object, these relocations
2012 are copied into the output file to be resolved at run
2019 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
2021 if (outrel
.r_offset
== (bfd_vma
) -1)
2023 else if (outrel
.r_offset
== (bfd_vma
) -2)
2024 skip
= true, relocate
= true;
2025 outrel
.r_offset
+= (input_section
->output_section
->vma
2026 + input_section
->output_offset
);
2029 memset (&outrel
, 0, sizeof outrel
);
2032 && (r_type
== R_386_PC32
2035 || (h
->elf_link_hash_flags
2036 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
2037 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
2040 /* This symbol is local, or marked to become local. */
2042 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2045 sreloc
= elf_section_data (input_section
)->sreloc
;
2049 loc
= (Elf32_External_Rel
*) sreloc
->contents
;
2050 loc
+= sreloc
->reloc_count
++;
2051 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
2053 /* If this reloc is against an external symbol, we do
2054 not want to fiddle with the addend. Otherwise, we
2055 need to include the symbol value so that it becomes
2056 an addend for the dynamic reloc. */
2066 /* FIXME: Why do we allow debugging sections to escape this error?
2067 More importantly, why do we not emit dynamic relocs for
2068 R_386_32 above in debugging sections (which are ! SEC_ALLOC)?
2069 If we had emitted the dynamic reloc, we could remove the
2071 if (unresolved_reloc
2073 && (input_section
->flags
& SEC_DEBUGGING
) != 0
2074 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
2075 (*_bfd_error_handler
)
2076 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2077 bfd_archive_filename (input_bfd
),
2078 bfd_get_section_name (input_bfd
, input_section
),
2079 (long) rel
->r_offset
,
2080 h
->root
.root
.string
);
2082 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
2083 contents
, rel
->r_offset
,
2084 relocation
, (bfd_vma
) 0);
2086 if (r
!= bfd_reloc_ok
)
2091 name
= h
->root
.root
.string
;
2094 name
= bfd_elf_string_from_elf_section (input_bfd
,
2095 symtab_hdr
->sh_link
,
2100 name
= bfd_section_name (input_bfd
, sec
);
2103 if (r
== bfd_reloc_overflow
)
2106 if (! ((*info
->callbacks
->reloc_overflow
)
2107 (info
, name
, howto
->name
, (bfd_vma
) 0,
2108 input_bfd
, input_section
, rel
->r_offset
)))
2113 (*_bfd_error_handler
)
2114 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2115 bfd_archive_filename (input_bfd
),
2116 bfd_get_section_name (input_bfd
, input_section
),
2117 (long) rel
->r_offset
, name
, (int) r
);
2126 /* Finish up dynamic symbol handling. We set the contents of various
2127 dynamic sections here. */
2130 elf_i386_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
2132 struct bfd_link_info
*info
;
2133 struct elf_link_hash_entry
*h
;
2134 Elf_Internal_Sym
*sym
;
2136 struct elf_i386_link_hash_table
*htab
;
2138 htab
= elf_i386_hash_table (info
);
2140 if (h
->plt
.offset
!= (bfd_vma
) -1)
2144 Elf_Internal_Rel rel
;
2145 Elf32_External_Rel
*loc
;
2147 /* This symbol has an entry in the procedure linkage table. Set
2150 if (h
->dynindx
== -1
2151 || htab
->splt
== NULL
2152 || htab
->sgotplt
== NULL
2153 || htab
->srelplt
== NULL
)
2156 /* Get the index in the procedure linkage table which
2157 corresponds to this symbol. This is the index of this symbol
2158 in all the symbols for which we are making plt entries. The
2159 first entry in the procedure linkage table is reserved. */
2160 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
2162 /* Get the offset into the .got table of the entry that
2163 corresponds to this function. Each .got entry is 4 bytes.
2164 The first three are reserved. */
2165 got_offset
= (plt_index
+ 3) * 4;
2167 /* Fill in the entry in the procedure linkage table. */
2170 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_plt_entry
,
2172 bfd_put_32 (output_bfd
,
2173 (htab
->sgotplt
->output_section
->vma
2174 + htab
->sgotplt
->output_offset
2176 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
2180 memcpy (htab
->splt
->contents
+ h
->plt
.offset
, elf_i386_pic_plt_entry
,
2182 bfd_put_32 (output_bfd
, got_offset
,
2183 htab
->splt
->contents
+ h
->plt
.offset
+ 2);
2186 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
2187 htab
->splt
->contents
+ h
->plt
.offset
+ 7);
2188 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
2189 htab
->splt
->contents
+ h
->plt
.offset
+ 12);
2191 /* Fill in the entry in the global offset table. */
2192 bfd_put_32 (output_bfd
,
2193 (htab
->splt
->output_section
->vma
2194 + htab
->splt
->output_offset
2197 htab
->sgotplt
->contents
+ got_offset
);
2199 /* Fill in the entry in the .rel.plt section. */
2200 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
2201 + htab
->sgotplt
->output_offset
2203 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
2204 loc
= (Elf32_External_Rel
*) htab
->srelplt
->contents
+ plt_index
;
2205 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
2207 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2209 /* Mark the symbol as undefined, rather than as defined in
2210 the .plt section. Leave the value alone. This is a clue
2211 for the dynamic linker, to make function pointer
2212 comparisons work between an application and shared
2214 sym
->st_shndx
= SHN_UNDEF
;
2218 if (h
->got
.offset
!= (bfd_vma
) -1)
2220 Elf_Internal_Rel rel
;
2221 Elf32_External_Rel
*loc
;
2223 /* This symbol has an entry in the global offset table. Set it
2226 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
2229 rel
.r_offset
= (htab
->sgot
->output_section
->vma
2230 + htab
->sgot
->output_offset
2231 + (h
->got
.offset
& ~(bfd_vma
) 1));
2233 /* If this is a static link, or it is a -Bsymbolic link and the
2234 symbol is defined locally or was forced to be local because
2235 of a version file, we just want to emit a RELATIVE reloc.
2236 The entry in the global offset table will already have been
2237 initialized in the relocate_section function. */
2241 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
))
2242 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
))
2244 BFD_ASSERT((h
->got
.offset
& 1) != 0);
2245 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
2249 BFD_ASSERT((h
->got
.offset
& 1) == 0);
2250 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
2251 htab
->sgot
->contents
+ h
->got
.offset
);
2252 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
2255 loc
= (Elf32_External_Rel
*) htab
->srelgot
->contents
;
2256 loc
+= htab
->srelgot
->reloc_count
++;
2257 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
2260 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
2262 Elf_Internal_Rel rel
;
2263 Elf32_External_Rel
*loc
;
2265 /* This symbol needs a copy reloc. Set it up. */
2267 if (h
->dynindx
== -1
2268 || (h
->root
.type
!= bfd_link_hash_defined
2269 && h
->root
.type
!= bfd_link_hash_defweak
)
2270 || htab
->srelbss
== NULL
)
2273 rel
.r_offset
= (h
->root
.u
.def
.value
2274 + h
->root
.u
.def
.section
->output_section
->vma
2275 + h
->root
.u
.def
.section
->output_offset
);
2276 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
2277 loc
= (Elf32_External_Rel
*) htab
->srelbss
->contents
;
2278 loc
+= htab
->srelbss
->reloc_count
++;
2279 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
2282 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2283 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
2284 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
2285 sym
->st_shndx
= SHN_ABS
;
2290 /* Used to decide how to sort relocs in an optimal manner for the
2291 dynamic linker, before writing them out. */
2293 static enum elf_reloc_type_class
2294 elf_i386_reloc_type_class (rela
)
2295 const Elf_Internal_Rela
*rela
;
2297 switch ((int) ELF32_R_TYPE (rela
->r_info
))
2299 case R_386_RELATIVE
:
2300 return reloc_class_relative
;
2301 case R_386_JUMP_SLOT
:
2302 return reloc_class_plt
;
2304 return reloc_class_copy
;
2306 return reloc_class_normal
;
2310 /* Finish up the dynamic sections. */
2313 elf_i386_finish_dynamic_sections (output_bfd
, info
)
2315 struct bfd_link_info
*info
;
2317 struct elf_i386_link_hash_table
*htab
;
2321 htab
= elf_i386_hash_table (info
);
2322 dynobj
= htab
->elf
.dynobj
;
2323 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2325 if (htab
->elf
.dynamic_sections_created
)
2327 Elf32_External_Dyn
*dyncon
, *dynconend
;
2329 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
2332 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
2333 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
2334 for (; dyncon
< dynconend
; dyncon
++)
2336 Elf_Internal_Dyn dyn
;
2339 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2347 dyn
.d_un
.d_ptr
= htab
->sgot
->output_section
->vma
;
2351 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
2355 s
= htab
->srelplt
->output_section
;
2356 if (s
->_cooked_size
!= 0)
2357 dyn
.d_un
.d_val
= s
->_cooked_size
;
2359 dyn
.d_un
.d_val
= s
->_raw_size
;
2363 /* My reading of the SVR4 ABI indicates that the
2364 procedure linkage table relocs (DT_JMPREL) should be
2365 included in the overall relocs (DT_REL). This is
2366 what Solaris does. However, UnixWare can not handle
2367 that case. Therefore, we override the DT_RELSZ entry
2368 here to make it not include the JMPREL relocs. Since
2369 the linker script arranges for .rel.plt to follow all
2370 other relocation sections, we don't have to worry
2371 about changing the DT_REL entry. */
2372 if (htab
->srelplt
!= NULL
)
2374 s
= htab
->srelplt
->output_section
;
2375 if (s
->_cooked_size
!= 0)
2376 dyn
.d_un
.d_val
-= s
->_cooked_size
;
2378 dyn
.d_un
.d_val
-= s
->_raw_size
;
2383 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
2386 /* Fill in the first entry in the procedure linkage table. */
2387 if (htab
->splt
&& htab
->splt
->_raw_size
> 0)
2390 memcpy (htab
->splt
->contents
,
2391 elf_i386_pic_plt0_entry
, PLT_ENTRY_SIZE
);
2394 memcpy (htab
->splt
->contents
,
2395 elf_i386_plt0_entry
, PLT_ENTRY_SIZE
);
2396 bfd_put_32 (output_bfd
,
2397 (htab
->sgotplt
->output_section
->vma
2398 + htab
->sgotplt
->output_offset
2400 htab
->splt
->contents
+ 2);
2401 bfd_put_32 (output_bfd
,
2402 (htab
->sgotplt
->output_section
->vma
2403 + htab
->sgotplt
->output_offset
2405 htab
->splt
->contents
+ 8);
2408 /* UnixWare sets the entsize of .plt to 4, although that doesn't
2409 really seem like the right value. */
2410 elf_section_data (htab
->splt
->output_section
)
2411 ->this_hdr
.sh_entsize
= 4;
2417 /* Fill in the first three entries in the global offset table. */
2418 if (htab
->sgotplt
->_raw_size
> 0)
2420 bfd_put_32 (output_bfd
,
2421 (sdyn
== NULL
? (bfd_vma
) 0
2422 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
2423 htab
->sgotplt
->contents
);
2424 bfd_put_32 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ 4);
2425 bfd_put_32 (output_bfd
, (bfd_vma
) 0, htab
->sgotplt
->contents
+ 8);
2428 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
2433 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
2434 #define TARGET_LITTLE_NAME "elf32-i386"
2435 #define ELF_ARCH bfd_arch_i386
2436 #define ELF_MACHINE_CODE EM_386
2437 #define ELF_MAXPAGESIZE 0x1000
2439 #define elf_backend_can_gc_sections 1
2440 #define elf_backend_can_refcount 1
2441 #define elf_backend_want_got_plt 1
2442 #define elf_backend_plt_readonly 1
2443 #define elf_backend_want_plt_sym 0
2444 #define elf_backend_got_header_size 12
2445 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
2447 #define elf_info_to_howto elf_i386_info_to_howto
2448 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
2450 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
2451 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
2452 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
2454 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
2455 #define elf_backend_check_relocs elf_i386_check_relocs
2456 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
2457 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
2458 #define elf_backend_fake_sections elf_i386_fake_sections
2459 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
2460 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
2461 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
2462 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
2463 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
2464 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
2465 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
2466 #define elf_backend_relocate_section elf_i386_relocate_section
2467 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
2469 #include "elf32-target.h"