* binutils-all/readelf.exp: Don't regard mips*el-*-* as traditional
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
CommitLineData
252b5132 1/* Intel 80386/80486-specific support for 32-bit ELF
7898deda 2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
638632bd 3 Free Software Foundation, Inc.
252b5132
RH
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "bfdlink.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26
27static reloc_howto_type *elf_i386_reloc_type_lookup
28 PARAMS ((bfd *, bfd_reloc_code_real_type));
29static void elf_i386_info_to_howto
30 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
31static void elf_i386_info_to_howto_rel
32 PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
33static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *));
34static struct bfd_hash_entry *elf_i386_link_hash_newfunc
35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36static struct bfd_link_hash_table *elf_i386_link_hash_table_create
37 PARAMS ((bfd *));
6725bdbf
AM
38static boolean create_got_section PARAMS((bfd *, struct bfd_link_info *));
39static boolean elf_i386_create_dynamic_sections
40 PARAMS((bfd *, struct bfd_link_info *));
252b5132
RH
41static boolean elf_i386_check_relocs
42 PARAMS ((bfd *, struct bfd_link_info *, asection *,
43 const Elf_Internal_Rela *));
a7b97311
AM
44static asection *elf_i386_gc_mark_hook
45 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
46 struct elf_link_hash_entry *, Elf_Internal_Sym *));
47static boolean elf_i386_gc_sweep_hook
48 PARAMS ((bfd *, struct bfd_link_info *, asection *,
49 const Elf_Internal_Rela *));
252b5132
RH
50static boolean elf_i386_adjust_dynamic_symbol
51 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
12d0ee4a 52static boolean allocate_plt_and_got_and_discard_relocs
6725bdbf 53 PARAMS ((struct elf_link_hash_entry *, PTR));
252b5132
RH
54static boolean elf_i386_size_dynamic_sections
55 PARAMS ((bfd *, struct bfd_link_info *));
56static boolean elf_i386_relocate_section
57 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
58 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
59static boolean elf_i386_finish_dynamic_symbol
60 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
61 Elf_Internal_Sym *));
62static boolean elf_i386_finish_dynamic_sections
63 PARAMS ((bfd *, struct bfd_link_info *));
a7b97311
AM
64static boolean elf_i386_fake_sections
65 PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
db6751f2 66static enum elf_reloc_type_class elf_i386_reloc_type_class PARAMS ((int));
252b5132
RH
67
68#define USE_REL 1 /* 386 uses REL relocations instead of RELA */
69
70#include "elf/i386.h"
71
72static reloc_howto_type elf_howto_table[]=
73{
1b452ec6
AM
74 HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_386_NONE",
76 true, 0x00000000, 0x00000000, false),
77 HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_386_32",
79 true, 0xffffffff, 0xffffffff, false),
80 HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_386_PC32",
82 true, 0xffffffff, 0xffffffff, true),
83 HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_GOT32",
85 true, 0xffffffff, 0xffffffff, false),
86 HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_PLT32",
88 true, 0xffffffff, 0xffffffff, true),
89 HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_COPY",
91 true, 0xffffffff, 0xffffffff, false),
92 HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
94 true, 0xffffffff, 0xffffffff, false),
95 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
97 true, 0xffffffff, 0xffffffff, false),
98 HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_RELATIVE",
100 true, 0xffffffff, 0xffffffff, false),
101 HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_GOTOFF",
103 true, 0xffffffff, 0xffffffff, false),
104 HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_GOTPC",
106 true, 0xffffffff, 0xffffffff, true),
107
dc47f327
AM
108 /* We have a gap in the reloc numbers here.
109 R_386_standard counts the number up to this point, and
110 R_386_ext_offset is the value to subtract from a reloc type of
111 R_386_16 thru R_386_PC8 to form an index into this table. */
1b452ec6
AM
112#define R_386_standard ((unsigned int) R_386_GOTPC + 1)
113#define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard)
114
252b5132 115 /* The remaining relocs are a GNU extension. */
1b452ec6
AM
116 HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_16",
118 true, 0xffff, 0xffff, false),
119 HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_PC16",
121 true, 0xffff, 0xffff, true),
122 HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_8",
124 true, 0xff, 0xff, false),
125 HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_386_PC8",
dc47f327
AM
127 true, 0xff, 0xff, true),
128
129 /* Another gap. */
130#define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset)
131#define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext)
252b5132
RH
132
133/* GNU extension to record C++ vtable hierarchy. */
252b5132
RH
134 HOWTO (R_386_GNU_VTINHERIT, /* type */
135 0, /* rightshift */
136 2, /* size (0 = byte, 1 = short, 2 = long) */
137 0, /* bitsize */
138 false, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_dont, /* complain_on_overflow */
141 NULL, /* special_function */
142 "R_386_GNU_VTINHERIT", /* name */
143 false, /* partial_inplace */
144 0, /* src_mask */
145 0, /* dst_mask */
dc47f327 146 false),
252b5132
RH
147
148/* GNU extension to record C++ vtable member usage. */
252b5132
RH
149 HOWTO (R_386_GNU_VTENTRY, /* type */
150 0, /* rightshift */
151 2, /* size (0 = byte, 1 = short, 2 = long) */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
157 "R_386_GNU_VTENTRY", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
dc47f327
AM
161 false)
162
163#define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
164
165};
166
252b5132
RH
167#ifdef DEBUG_GEN_RELOC
168#define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
169#else
170#define TRACE(str)
171#endif
172
173static reloc_howto_type *
174elf_i386_reloc_type_lookup (abfd, code)
7442e600 175 bfd *abfd ATTRIBUTE_UNUSED;
252b5132
RH
176 bfd_reloc_code_real_type code;
177{
178 switch (code)
179 {
180 case BFD_RELOC_NONE:
181 TRACE ("BFD_RELOC_NONE");
1b452ec6 182 return &elf_howto_table[(unsigned int) R_386_NONE ];
252b5132
RH
183
184 case BFD_RELOC_32:
185 TRACE ("BFD_RELOC_32");
1b452ec6 186 return &elf_howto_table[(unsigned int) R_386_32 ];
252b5132
RH
187
188 case BFD_RELOC_CTOR:
189 TRACE ("BFD_RELOC_CTOR");
1b452ec6 190 return &elf_howto_table[(unsigned int) R_386_32 ];
252b5132
RH
191
192 case BFD_RELOC_32_PCREL:
193 TRACE ("BFD_RELOC_PC32");
1b452ec6 194 return &elf_howto_table[(unsigned int) R_386_PC32 ];
252b5132
RH
195
196 case BFD_RELOC_386_GOT32:
197 TRACE ("BFD_RELOC_386_GOT32");
1b452ec6 198 return &elf_howto_table[(unsigned int) R_386_GOT32 ];
252b5132
RH
199
200 case BFD_RELOC_386_PLT32:
201 TRACE ("BFD_RELOC_386_PLT32");
1b452ec6 202 return &elf_howto_table[(unsigned int) R_386_PLT32 ];
252b5132
RH
203
204 case BFD_RELOC_386_COPY:
205 TRACE ("BFD_RELOC_386_COPY");
1b452ec6 206 return &elf_howto_table[(unsigned int) R_386_COPY ];
252b5132
RH
207
208 case BFD_RELOC_386_GLOB_DAT:
209 TRACE ("BFD_RELOC_386_GLOB_DAT");
1b452ec6 210 return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ];
252b5132
RH
211
212 case BFD_RELOC_386_JUMP_SLOT:
213 TRACE ("BFD_RELOC_386_JUMP_SLOT");
1b452ec6 214 return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ];
252b5132
RH
215
216 case BFD_RELOC_386_RELATIVE:
217 TRACE ("BFD_RELOC_386_RELATIVE");
1b452ec6 218 return &elf_howto_table[(unsigned int) R_386_RELATIVE ];
252b5132
RH
219
220 case BFD_RELOC_386_GOTOFF:
221 TRACE ("BFD_RELOC_386_GOTOFF");
1b452ec6 222 return &elf_howto_table[(unsigned int) R_386_GOTOFF ];
252b5132
RH
223
224 case BFD_RELOC_386_GOTPC:
225 TRACE ("BFD_RELOC_386_GOTPC");
1b452ec6 226 return &elf_howto_table[(unsigned int) R_386_GOTPC ];
252b5132
RH
227
228 /* The remaining relocs are a GNU extension. */
229 case BFD_RELOC_16:
230 TRACE ("BFD_RELOC_16");
1b452ec6 231 return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset];
252b5132
RH
232
233 case BFD_RELOC_16_PCREL:
234 TRACE ("BFD_RELOC_16_PCREL");
1b452ec6 235 return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset];
252b5132
RH
236
237 case BFD_RELOC_8:
238 TRACE ("BFD_RELOC_8");
1b452ec6 239 return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset];
252b5132
RH
240
241 case BFD_RELOC_8_PCREL:
242 TRACE ("BFD_RELOC_8_PCREL");
1b452ec6 243 return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset];
252b5132
RH
244
245 case BFD_RELOC_VTABLE_INHERIT:
246 TRACE ("BFD_RELOC_VTABLE_INHERIT");
dc47f327
AM
247 return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT
248 - R_386_vt_offset];
252b5132
RH
249
250 case BFD_RELOC_VTABLE_ENTRY:
251 TRACE ("BFD_RELOC_VTABLE_ENTRY");
dc47f327
AM
252 return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY
253 - R_386_vt_offset];
252b5132
RH
254
255 default:
256 break;
257 }
258
259 TRACE ("Unknown");
260 return 0;
261}
262
263static void
264elf_i386_info_to_howto (abfd, cache_ptr, dst)
7442e600
ILT
265 bfd *abfd ATTRIBUTE_UNUSED;
266 arelent *cache_ptr ATTRIBUTE_UNUSED;
267 Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED;
252b5132
RH
268{
269 abort ();
270}
271
272static void
273elf_i386_info_to_howto_rel (abfd, cache_ptr, dst)
7442e600 274 bfd *abfd ATTRIBUTE_UNUSED;
252b5132
RH
275 arelent *cache_ptr;
276 Elf32_Internal_Rel *dst;
277{
dc47f327
AM
278 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
279 unsigned int indx;
280
281 if ((indx = r_type) >= R_386_standard
282 && ((indx = r_type - R_386_ext_offset) - R_386_standard
283 >= R_386_ext - R_386_standard)
284 && ((indx = r_type - R_386_vt_offset) - R_386_ext
285 >= R_386_vt - R_386_ext))
252b5132 286 {
dc47f327
AM
287 (*_bfd_error_handler) (_("%s: invalid relocation type %d"),
288 bfd_get_filename (abfd), (int) r_type);
289 indx = (unsigned int) R_386_NONE;
252b5132 290 }
dc47f327 291 cache_ptr->howto = &elf_howto_table[indx];
252b5132
RH
292}
293
294/* Return whether a symbol name implies a local label. The UnixWare
295 2.1 cc generates temporary symbols that start with .X, so we
296 recognize them here. FIXME: do other SVR4 compilers also use .X?.
297 If so, we should move the .X recognition into
298 _bfd_elf_is_local_label_name. */
299
300static boolean
301elf_i386_is_local_label_name (abfd, name)
302 bfd *abfd;
303 const char *name;
304{
305 if (name[0] == '.' && name[1] == 'X')
306 return true;
307
308 return _bfd_elf_is_local_label_name (abfd, name);
309}
310\f
311/* Functions for the i386 ELF linker. */
312
313/* The name of the dynamic interpreter. This is put in the .interp
314 section. */
315
316#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
317
318/* The size in bytes of an entry in the procedure linkage table. */
319
320#define PLT_ENTRY_SIZE 16
321
322/* The first entry in an absolute procedure linkage table looks like
323 this. See the SVR4 ABI i386 supplement to see how this works. */
324
325static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
326{
327 0xff, 0x35, /* pushl contents of address */
328 0, 0, 0, 0, /* replaced with address of .got + 4. */
329 0xff, 0x25, /* jmp indirect */
330 0, 0, 0, 0, /* replaced with address of .got + 8. */
331 0, 0, 0, 0 /* pad out to 16 bytes. */
332};
333
334/* Subsequent entries in an absolute procedure linkage table look like
335 this. */
336
337static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
338{
339 0xff, 0x25, /* jmp indirect */
340 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
341 0x68, /* pushl immediate */
342 0, 0, 0, 0, /* replaced with offset into relocation table. */
343 0xe9, /* jmp relative */
344 0, 0, 0, 0 /* replaced with offset to start of .plt. */
345};
346
347/* The first entry in a PIC procedure linkage table look like this. */
348
349static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
350{
351 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
352 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
353 0, 0, 0, 0 /* pad out to 16 bytes. */
354};
355
356/* Subsequent entries in a PIC procedure linkage table look like this. */
357
358static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
359{
360 0xff, 0xa3, /* jmp *offset(%ebx) */
361 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
362 0x68, /* pushl immediate */
363 0, 0, 0, 0, /* replaced with offset into relocation table. */
364 0xe9, /* jmp relative */
365 0, 0, 0, 0 /* replaced with offset to start of .plt. */
366};
367
368/* The i386 linker needs to keep track of the number of relocs that it
ffb2e45b
AM
369 decides to copy as dynamic relocs in check_relocs for each symbol.
370 This is so that it can later discard them if they are found to be
371 unnecessary. We store the information in a field extending the
372 regular ELF linker hash table. */
252b5132 373
ffb2e45b 374struct elf_i386_dyn_relocs
252b5132
RH
375{
376 /* Next section. */
ffb2e45b 377 struct elf_i386_dyn_relocs *next;
252b5132
RH
378 /* A section in dynobj. */
379 asection *section;
380 /* Number of relocs copied in this section. */
381 bfd_size_type count;
382};
383
384/* i386 ELF linker hash entry. */
385
386struct elf_i386_link_hash_entry
387{
388 struct elf_link_hash_entry root;
389
390 /* Number of PC relative relocs copied for this symbol. */
ffb2e45b 391 struct elf_i386_dyn_relocs *dyn_relocs;
252b5132
RH
392};
393
394/* i386 ELF linker hash table. */
395
396struct elf_i386_link_hash_table
397{
398 struct elf_link_hash_table root;
252b5132 399
6725bdbf
AM
400 /* Short-cuts to get to dynamic linker sections. */
401 asection *sgot;
402 asection *sgotplt;
403 asection *srelgot;
404 asection *splt;
405 asection *srelplt;
406 asection *sdynbss;
407 asection *srelbss;
408};
252b5132
RH
409
410/* Get the i386 ELF linker hash table from a link_info structure. */
411
412#define elf_i386_hash_table(p) \
413 ((struct elf_i386_link_hash_table *) ((p)->hash))
414
415/* Create an entry in an i386 ELF linker hash table. */
416
417static struct bfd_hash_entry *
418elf_i386_link_hash_newfunc (entry, table, string)
419 struct bfd_hash_entry *entry;
420 struct bfd_hash_table *table;
421 const char *string;
422{
423 struct elf_i386_link_hash_entry *ret =
424 (struct elf_i386_link_hash_entry *) entry;
425
426 /* Allocate the structure if it has not already been allocated by a
427 subclass. */
428 if (ret == (struct elf_i386_link_hash_entry *) NULL)
429 ret = ((struct elf_i386_link_hash_entry *)
430 bfd_hash_allocate (table,
431 sizeof (struct elf_i386_link_hash_entry)));
432 if (ret == (struct elf_i386_link_hash_entry *) NULL)
433 return (struct bfd_hash_entry *) ret;
434
435 /* Call the allocation method of the superclass. */
436 ret = ((struct elf_i386_link_hash_entry *)
437 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
438 table, string));
439 if (ret != (struct elf_i386_link_hash_entry *) NULL)
440 {
ffb2e45b 441 ret->dyn_relocs = NULL;
252b5132
RH
442 }
443
444 return (struct bfd_hash_entry *) ret;
445}
446
447/* Create an i386 ELF linker hash table. */
448
449static struct bfd_link_hash_table *
450elf_i386_link_hash_table_create (abfd)
451 bfd *abfd;
452{
453 struct elf_i386_link_hash_table *ret;
454
455 ret = ((struct elf_i386_link_hash_table *)
456 bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table)));
457 if (ret == (struct elf_i386_link_hash_table *) NULL)
458 return NULL;
459
460 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
461 elf_i386_link_hash_newfunc))
462 {
463 bfd_release (abfd, ret);
464 return NULL;
465 }
466
6725bdbf
AM
467 ret->sgot = NULL;
468 ret->sgotplt = NULL;
469 ret->srelgot = NULL;
470 ret->splt = NULL;
471 ret->srelplt = NULL;
472 ret->sdynbss = NULL;
473 ret->srelbss = NULL;
474
252b5132
RH
475 return &ret->root.root;
476}
477
6725bdbf
AM
478/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
479 shortcuts to them in our hash table. */
480
481static boolean
482create_got_section (dynobj, info)
483 bfd *dynobj;
484 struct bfd_link_info *info;
485{
486 struct elf_i386_link_hash_table *htab;
487
488 if (! _bfd_elf_create_got_section (dynobj, info))
489 return false;
490
491 htab = elf_i386_hash_table (info);
492 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
493 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
494 if (!htab->sgot || !htab->sgotplt)
495 abort ();
496
497 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
498 if (htab->srelgot == NULL
499 || ! bfd_set_section_flags (dynobj, htab->srelgot,
500 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
501 | SEC_IN_MEMORY | SEC_LINKER_CREATED
502 | SEC_READONLY))
503 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
504 return false;
505 return true;
506}
507
508/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
509 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
510 hash table. */
511
512static boolean
513elf_i386_create_dynamic_sections (dynobj, info)
514 bfd *dynobj;
515 struct bfd_link_info *info;
516{
517 struct elf_i386_link_hash_table *htab;
518
519 htab = elf_i386_hash_table (info);
520 if (!htab->sgot && !create_got_section (dynobj, info))
521 return false;
522
523 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
524 return false;
525
526 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
527 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
528 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
529 if (!info->shared)
530 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
531
532 if (!htab->splt || !htab->srelplt || !htab->sdynbss
533 || (!info->shared && !htab->srelbss))
534 abort ();
535
536 return true;
537}
538
252b5132
RH
539/* Look through the relocs for a section during the first phase, and
540 allocate space in the global offset table or procedure linkage
541 table. */
542
543static boolean
544elf_i386_check_relocs (abfd, info, sec, relocs)
545 bfd *abfd;
546 struct bfd_link_info *info;
547 asection *sec;
548 const Elf_Internal_Rela *relocs;
549{
6725bdbf 550 struct elf_i386_link_hash_table *htab;
252b5132
RH
551 bfd *dynobj;
552 Elf_Internal_Shdr *symtab_hdr;
553 struct elf_link_hash_entry **sym_hashes;
dd5724d5 554 bfd_signed_vma *local_got_refcounts;
252b5132
RH
555 const Elf_Internal_Rela *rel;
556 const Elf_Internal_Rela *rel_end;
252b5132
RH
557 asection *sreloc;
558
559 if (info->relocateable)
560 return true;
561
6725bdbf
AM
562 htab = elf_i386_hash_table (info);
563 dynobj = htab->root.dynobj;
252b5132
RH
564 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
565 sym_hashes = elf_sym_hashes (abfd);
dd5724d5 566 local_got_refcounts = elf_local_got_refcounts (abfd);
252b5132 567
252b5132
RH
568 sreloc = NULL;
569
570 rel_end = relocs + sec->reloc_count;
571 for (rel = relocs; rel < rel_end; rel++)
572 {
573 unsigned long r_symndx;
574 struct elf_link_hash_entry *h;
575
576 r_symndx = ELF32_R_SYM (rel->r_info);
577
d9bc7a44 578 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
f5f31454
L
579 {
580 if (abfd->my_archive)
581 (*_bfd_error_handler) (_("%s(%s): bad symbol index: %d"),
582 bfd_get_filename (abfd->my_archive),
583 bfd_get_filename (abfd),
584 r_symndx);
585 else
586 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
587 bfd_get_filename (abfd),
588 r_symndx);
589 return false;
590 }
591
252b5132
RH
592 if (r_symndx < symtab_hdr->sh_info)
593 h = NULL;
594 else
595 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
596
597 /* Some relocs require a global offset table. */
12d0ee4a 598 if (htab->sgot == NULL)
252b5132
RH
599 {
600 switch (ELF32_R_TYPE (rel->r_info))
601 {
602 case R_386_GOT32:
603 case R_386_GOTOFF:
604 case R_386_GOTPC:
12d0ee4a
AM
605 if (dynobj == NULL)
606 htab->root.dynobj = dynobj = abfd;
6725bdbf 607 if (!create_got_section (dynobj, info))
252b5132
RH
608 return false;
609 break;
610
611 default:
612 break;
613 }
614 }
615
616 switch (ELF32_R_TYPE (rel->r_info))
617 {
618 case R_386_GOT32:
619 /* This symbol requires a global offset table entry. */
252b5132
RH
620 if (h != NULL)
621 {
dd5724d5 622 if (h->got.refcount == -1)
5a15f56f 623 h->got.refcount = 1;
dd5724d5
AM
624 else
625 h->got.refcount += 1;
252b5132
RH
626 }
627 else
628 {
83be169b 629 /* This is a global offset table entry for a local symbol. */
dd5724d5 630 if (local_got_refcounts == NULL)
252b5132
RH
631 {
632 size_t size;
252b5132 633
dd5724d5
AM
634 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
635 local_got_refcounts = ((bfd_signed_vma *)
636 bfd_alloc (abfd, size));
637 if (local_got_refcounts == NULL)
252b5132 638 return false;
dd5724d5
AM
639 elf_local_got_refcounts (abfd) = local_got_refcounts;
640 memset (local_got_refcounts, -1, size);
252b5132 641 }
dd5724d5 642 if (local_got_refcounts[r_symndx] == -1)
6725bdbf 643 local_got_refcounts[r_symndx] = 1;
dd5724d5
AM
644 else
645 local_got_refcounts[r_symndx] += 1;
252b5132 646 }
252b5132
RH
647 break;
648
649 case R_386_PLT32:
650 /* This symbol requires a procedure linkage table entry. We
83be169b
AM
651 actually build the entry in adjust_dynamic_symbol,
652 because this might be a case of linking PIC code which is
653 never referenced by a dynamic object, in which case we
654 don't need to generate a procedure linkage table entry
655 after all. */
252b5132
RH
656
657 /* If this is a local symbol, we resolve it directly without
83be169b 658 creating a procedure linkage table entry. */
252b5132
RH
659 if (h == NULL)
660 continue;
661
dd5724d5
AM
662 if (h->plt.refcount == -1)
663 {
dd5724d5 664 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
6725bdbf 665 h->plt.refcount = 1;
dd5724d5
AM
666 }
667 else
668 h->plt.refcount += 1;
252b5132
RH
669 break;
670
671 case R_386_32:
672 case R_386_PC32:
12d0ee4a 673 if (h != NULL && !info->shared)
6725bdbf 674 {
12d0ee4a
AM
675 /* If this reloc is in a read-only section, we might
676 need a copy reloc. */
677 if ((sec->flags & SEC_READONLY) != 0)
678 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
679
680 /* We may need a .plt entry if the function this reloc
681 refers to is in a shared lib. */
682 if (h->plt.refcount == -1)
683 h->plt.refcount = 1;
684 else
685 h->plt.refcount += 1;
6725bdbf 686 }
7843f00e 687
252b5132 688 /* If we are creating a shared library, and this is a reloc
f69da49f
AM
689 against a global symbol, or a non PC relative reloc
690 against a local symbol, then we need to copy the reloc
691 into the shared library. However, if we are linking with
692 -Bsymbolic, we do not need to copy a reloc against a
693 global symbol which is defined in an object we are
694 including in the link (i.e., DEF_REGULAR is set). At
695 this point we have not seen all the input files, so it is
696 possible that DEF_REGULAR is not set now but will be set
1f655a09
L
697 later (it is never cleared). In case of a weak definition,
698 DEF_REGULAR may be cleared later by a strong definition in
699 a shared library. We account for that possibility below by
700 storing information in the relocs_copied field of the hash
701 table entry. A similar situation occurs when creating
702 shared libraries and symbol visibility changes render the
12d0ee4a
AM
703 symbol local.
704 If on the other hand, we are creating an executable, we
705 may need to keep relocations for symbols satisfied by a
706 dynamic library if we manage to avoid copy relocs for the
707 symbol. */
708 if ((info->shared
709 && (sec->flags & SEC_ALLOC) != 0
710 && (ELF32_R_TYPE (rel->r_info) != R_386_PC32
711 || (h != NULL
712 && (! info->symbolic
713 || h->root.type == bfd_link_hash_defweak
714 || (h->elf_link_hash_flags
715 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
716 || (!info->shared
717 && (sec->flags & SEC_ALLOC) != 0
718 && h != NULL
719 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
720 && (h->root.type == bfd_link_hash_defweak
721 || (h->elf_link_hash_flags
722 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
252b5132 723 {
12d0ee4a
AM
724 /* We must copy these reloc types into the output file.
725 Create a reloc section in dynobj and make room for
726 this reloc. */
727 if (dynobj == NULL)
728 htab->root.dynobj = dynobj = abfd;
28d0b90e 729
252b5132
RH
730 if (sreloc == NULL)
731 {
732 const char *name;
733
734 name = (bfd_elf_string_from_elf_section
735 (abfd,
736 elf_elfheader (abfd)->e_shstrndx,
737 elf_section_data (sec)->rel_hdr.sh_name));
738 if (name == NULL)
739 return false;
740
c8492176
L
741 if (strncmp (name, ".rel", 4) != 0
742 || strcmp (bfd_get_section_name (abfd, sec),
743 name + 4) != 0)
744 {
745 if (abfd->my_archive)
746 (*_bfd_error_handler) (_("%s(%s): bad relocation section name `%s\'"),
747 bfd_get_filename (abfd->my_archive),
748 bfd_get_filename (abfd),
749 name);
750 else
751 (*_bfd_error_handler) (_("%s: bad relocation section name `%s\'"),
752 bfd_get_filename (abfd),
753 name);
f5f31454 754 }
252b5132
RH
755
756 sreloc = bfd_get_section_by_name (dynobj, name);
757 if (sreloc == NULL)
758 {
759 flagword flags;
760
761 sreloc = bfd_make_section (dynobj, name);
762 flags = (SEC_HAS_CONTENTS | SEC_READONLY
763 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
764 if ((sec->flags & SEC_ALLOC) != 0)
765 flags |= SEC_ALLOC | SEC_LOAD;
766 if (sreloc == NULL
767 || ! bfd_set_section_flags (dynobj, sreloc, flags)
768 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
769 return false;
770 }
db6751f2
JJ
771 if (sec->flags & SEC_READONLY)
772 info->flags |= DF_TEXTREL;
252b5132
RH
773 }
774
775 sreloc->_raw_size += sizeof (Elf32_External_Rel);
776
f69da49f
AM
777 /* If this is a global symbol, we count the number of PC
778 relative relocations we have entered for this symbol,
779 so that we can discard them later as necessary. Note
780 that this function is only called if we are using an
781 elf_i386 linker hash table, which means that h is
782 really a pointer to an elf_i386_link_hash_entry. */
12d0ee4a
AM
783 if (!info->shared
784 || (h != NULL
785 && ELF32_R_TYPE (rel->r_info) == R_386_PC32))
252b5132
RH
786 {
787 struct elf_i386_link_hash_entry *eh;
ffb2e45b 788 struct elf_i386_dyn_relocs *p;
252b5132
RH
789
790 eh = (struct elf_i386_link_hash_entry *) h;
791
ffb2e45b 792 for (p = eh->dyn_relocs; p != NULL; p = p->next)
252b5132
RH
793 if (p->section == sreloc)
794 break;
795
796 if (p == NULL)
797 {
ffb2e45b 798 p = ((struct elf_i386_dyn_relocs *)
252b5132
RH
799 bfd_alloc (dynobj, sizeof *p));
800 if (p == NULL)
801 return false;
ffb2e45b
AM
802 p->next = eh->dyn_relocs;
803 eh->dyn_relocs = p;
252b5132
RH
804 p->section = sreloc;
805 p->count = 0;
806 }
807
808 ++p->count;
809 }
810 }
811
812 break;
813
814 /* This relocation describes the C++ object vtable hierarchy.
815 Reconstruct it for later use during GC. */
816 case R_386_GNU_VTINHERIT:
817 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
818 return false;
819 break;
820
821 /* This relocation describes which C++ vtable entries are actually
822 used. Record for later use during GC. */
823 case R_386_GNU_VTENTRY:
824 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
825 return false;
826 break;
827
828 default:
829 break;
830 }
831 }
832
833 return true;
834}
835
836/* Return the section that should be marked against GC for a given
837 relocation. */
838
839static asection *
840elf_i386_gc_mark_hook (abfd, info, rel, h, sym)
841 bfd *abfd;
7442e600 842 struct bfd_link_info *info ATTRIBUTE_UNUSED;
252b5132
RH
843 Elf_Internal_Rela *rel;
844 struct elf_link_hash_entry *h;
845 Elf_Internal_Sym *sym;
846{
847 if (h != NULL)
848 {
849 switch (ELF32_R_TYPE (rel->r_info))
850 {
851 case R_386_GNU_VTINHERIT:
852 case R_386_GNU_VTENTRY:
853 break;
854
855 default:
856 switch (h->root.type)
857 {
858 case bfd_link_hash_defined:
859 case bfd_link_hash_defweak:
860 return h->root.u.def.section;
861
862 case bfd_link_hash_common:
863 return h->root.u.c.p->section;
864
865 default:
866 break;
867 }
868 }
869 }
870 else
871 {
872 if (!(elf_bad_symtab (abfd)
873 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
874 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
875 && sym->st_shndx != SHN_COMMON))
876 {
877 return bfd_section_from_elf_index (abfd, sym->st_shndx);
878 }
879 }
880
881 return NULL;
882}
883
884/* Update the got entry reference counts for the section being removed. */
885
886static boolean
887elf_i386_gc_sweep_hook (abfd, info, sec, relocs)
dd5724d5 888 bfd *abfd;
6725bdbf 889 struct bfd_link_info *info;
dd5724d5
AM
890 asection *sec;
891 const Elf_Internal_Rela *relocs;
252b5132 892{
dd5724d5
AM
893 Elf_Internal_Shdr *symtab_hdr;
894 struct elf_link_hash_entry **sym_hashes;
895 bfd_signed_vma *local_got_refcounts;
896 const Elf_Internal_Rela *rel, *relend;
897 unsigned long r_symndx;
898 struct elf_link_hash_entry *h;
899 bfd *dynobj;
dd5724d5
AM
900
901 dynobj = elf_hash_table (info)->dynobj;
902 if (dynobj == NULL)
903 return true;
904
6725bdbf
AM
905 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
906 sym_hashes = elf_sym_hashes (abfd);
907 local_got_refcounts = elf_local_got_refcounts (abfd);
dd5724d5
AM
908
909 relend = relocs + sec->reloc_count;
910 for (rel = relocs; rel < relend; rel++)
911 switch (ELF32_R_TYPE (rel->r_info))
912 {
913 case R_386_GOT32:
914 case R_386_GOTOFF:
915 case R_386_GOTPC:
916 r_symndx = ELF32_R_SYM (rel->r_info);
917 if (r_symndx >= symtab_hdr->sh_info)
918 {
919 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
920 if (h->got.refcount > 0)
6725bdbf 921 h->got.refcount -= 1;
dd5724d5
AM
922 }
923 else if (local_got_refcounts != NULL)
924 {
925 if (local_got_refcounts[r_symndx] > 0)
6725bdbf 926 local_got_refcounts[r_symndx] -= 1;
dd5724d5
AM
927 }
928 break;
929
6725bdbf
AM
930 case R_386_32:
931 case R_386_PC32:
932 if (info->shared)
933 break;
934 /* Fall through. */
935
dd5724d5
AM
936 case R_386_PLT32:
937 r_symndx = ELF32_R_SYM (rel->r_info);
938 if (r_symndx >= symtab_hdr->sh_info)
939 {
940 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
941 if (h->plt.refcount > 0)
942 h->plt.refcount -= 1;
943 }
944 break;
945
946 default:
947 break;
948 }
252b5132
RH
949
950 return true;
951}
952
953/* Adjust a symbol defined by a dynamic object and referenced by a
954 regular object. The current definition is in some section of the
955 dynamic object, but we're not including those sections. We have to
956 change the definition to something the rest of the link can
957 understand. */
958
959static boolean
960elf_i386_adjust_dynamic_symbol (info, h)
961 struct bfd_link_info *info;
962 struct elf_link_hash_entry *h;
963{
6725bdbf 964 struct elf_i386_link_hash_table *htab;
252b5132
RH
965 bfd *dynobj;
966 asection *s;
967 unsigned int power_of_two;
968
6725bdbf
AM
969 htab = elf_i386_hash_table (info);
970 dynobj = htab->root.dynobj;
252b5132 971
252b5132
RH
972 /* If this is a function, put it in the procedure linkage table. We
973 will fill in the contents of the procedure linkage table later,
974 when we know the address of the .got section. */
975 if (h->type == STT_FUNC
976 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
977 {
6725bdbf
AM
978 if (h->plt.refcount <= 0
979 || (! info->shared
980 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
981 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0))
252b5132
RH
982 {
983 /* This case can occur if we saw a PLT32 reloc in an input
dd5724d5
AM
984 file, but the symbol was never referred to by a dynamic
985 object, or if all references were garbage collected. In
986 such a case, we don't actually need to build a procedure
987 linkage table, and we can just do a PC32 reloc instead. */
6725bdbf 988 h->plt.refcount = (bfd_vma) -1;
dd5724d5 989 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
252b5132
RH
990 }
991
252b5132
RH
992 return true;
993 }
6725bdbf
AM
994 else
995 /* It's possible that we incorrectly decided a .plt reloc was
996 needed for an R_386_PC32 reloc to a non-function sym in
997 check_relocs. We can't decide accurately between function and
998 non-function syms in check-relocs; Objects loaded later in
999 the link may change h->type. So fix it now. */
1000 h->plt.refcount = (bfd_vma) -1;
252b5132
RH
1001
1002 /* If this is a weak symbol, and there is a real definition, the
1003 processor independent code will have arranged for us to see the
1004 real definition first, and we can just use the same value. */
1005 if (h->weakdef != NULL)
1006 {
1007 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1008 || h->weakdef->root.type == bfd_link_hash_defweak);
1009 h->root.u.def.section = h->weakdef->root.u.def.section;
1010 h->root.u.def.value = h->weakdef->root.u.def.value;
1011 return true;
1012 }
1013
1014 /* This is a reference to a symbol defined by a dynamic object which
1015 is not a function. */
1016
1017 /* If we are creating a shared library, we must presume that the
1018 only references to the symbol are via the global offset table.
1019 For such cases we need not do anything here; the relocations will
1020 be handled correctly by relocate_section. */
1021 if (info->shared)
1022 return true;
1023
7843f00e
ILT
1024 /* If there are no references to this symbol that do not use the
1025 GOT, we don't need to generate a copy reloc. */
1026 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1027 return true;
1028
252b5132
RH
1029 /* We must allocate the symbol in our .dynbss section, which will
1030 become part of the .bss section of the executable. There will be
1031 an entry for this symbol in the .dynsym section. The dynamic
1032 object will contain position independent code, so all references
1033 from the dynamic object to this symbol will go through the global
1034 offset table. The dynamic linker will use the .dynsym entry to
1035 determine the address it must put in the global offset table, so
1036 both the dynamic object and the regular object will refer to the
1037 same memory location for the variable. */
1038
6725bdbf 1039 s = htab->sdynbss;
ffb2e45b
AM
1040 if (s == NULL)
1041 abort ();
252b5132
RH
1042
1043 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1044 copy the initial value out of the dynamic object and into the
1045 runtime process image. We need to remember the offset into the
1046 .rel.bss section we are going to use. */
1047 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1048 {
1049 asection *srel;
1050
6725bdbf 1051 srel = htab->srelbss;
ffb2e45b
AM
1052 if (srel == NULL)
1053 abort ();
252b5132
RH
1054 srel->_raw_size += sizeof (Elf32_External_Rel);
1055 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1056 }
1057
1058 /* We need to figure out the alignment required for this symbol. I
1059 have no idea how ELF linkers handle this. */
1060 power_of_two = bfd_log2 (h->size);
1061 if (power_of_two > 3)
1062 power_of_two = 3;
1063
1064 /* Apply the required alignment. */
1065 s->_raw_size = BFD_ALIGN (s->_raw_size,
1066 (bfd_size_type) (1 << power_of_two));
1067 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1068 {
1069 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1070 return false;
1071 }
1072
1073 /* Define the symbol as being at this point in the section. */
1074 h->root.u.def.section = s;
1075 h->root.u.def.value = s->_raw_size;
1076
1077 /* Increment the section size to make room for the symbol. */
1078 s->_raw_size += h->size;
1079
1080 return true;
1081}
1082
6725bdbf
AM
1083/* This is the condition under which elf_i386_finish_dynamic_symbol
1084 will be called from elflink.h. If elflink.h doesn't call our
1085 finish_dynamic_symbol routine, we'll need to do something about
1086 initializing any .plt and .got entries in elf_i386_relocate_section. */
1087#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1088 ((DYN) \
1089 && ((INFO)->shared \
1090 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1091 && ((H)->dynindx != -1 \
1092 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1093
1094/* Allocate space in .plt, .got and associated reloc sections for
12d0ee4a
AM
1095 global syms. Also discards space allocated for relocs in the
1096 check_relocs function that we subsequently have found to be
1097 unneeded. */
6725bdbf
AM
1098
1099static boolean
12d0ee4a 1100allocate_plt_and_got_and_discard_relocs (h, inf)
6725bdbf
AM
1101 struct elf_link_hash_entry *h;
1102 PTR inf;
1103{
1104 struct bfd_link_info *info;
1105 struct elf_i386_link_hash_table *htab;
1106 asection *s;
5a15f56f 1107 struct elf_i386_link_hash_entry *eh;
6725bdbf
AM
1108
1109 if (h->root.type == bfd_link_hash_indirect
1110 || h->root.type == bfd_link_hash_warning)
1111 return true;
1112
1113 info = (struct bfd_link_info *) inf;
1114 htab = elf_i386_hash_table (info);
1115
1116 if (htab->root.dynamic_sections_created
1117 && h->plt.refcount > 0)
1118 {
5a15f56f
AM
1119 /* Make sure this symbol is output as a dynamic symbol.
1120 Undefined weak syms won't yet be marked as dynamic. */
1121 if (h->dynindx == -1
1122 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1123 {
1124 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1125 return false;
1126 }
1127
6725bdbf 1128 s = htab->splt;
ffb2e45b
AM
1129 if (s == NULL)
1130 abort ();
6725bdbf
AM
1131
1132 /* If this is the first .plt entry, make room for the special
1133 first entry. */
1134 if (s->_raw_size == 0)
1135 s->_raw_size += PLT_ENTRY_SIZE;
1136
1137 h->plt.offset = s->_raw_size;
1138
1139 /* If this symbol is not defined in a regular file, and we are
1140 not generating a shared library, then set the symbol to this
1141 location in the .plt. This is required to make function
1142 pointers compare as equal between the normal executable and
1143 the shared library. */
1144 if (! info->shared
1145 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1146 {
1147 h->root.u.def.section = s;
1148 h->root.u.def.value = h->plt.offset;
1149 }
1150
1151 /* Make room for this entry. */
1152 s->_raw_size += PLT_ENTRY_SIZE;
1153
1154 /* We also need to make an entry in the .got.plt section, which
1155 will be placed in the .got section by the linker script. */
1156 s = htab->sgotplt;
ffb2e45b
AM
1157 if (s == NULL)
1158 abort ();
6725bdbf
AM
1159 s->_raw_size += 4;
1160
1161 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1162 {
1163 /* We also need to make an entry in the .rel.plt section. */
1164 s = htab->srelplt;
ffb2e45b
AM
1165 if (s == NULL)
1166 abort ();
6725bdbf
AM
1167 s->_raw_size += sizeof (Elf32_External_Rel);
1168 }
1169 }
1170 else
1171 {
1172 h->plt.offset = (bfd_vma) -1;
1173 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1174 }
1175
1176 if (h->got.refcount > 0)
1177 {
1178 boolean dyn;
1179
5a15f56f
AM
1180 /* Make sure this symbol is output as a dynamic symbol.
1181 Undefined weak syms won't yet be marked as dynamic. */
1182 if (h->dynindx == -1
1183 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1184 {
1185 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1186 return false;
1187 }
1188
6725bdbf
AM
1189 s = htab->sgot;
1190 h->got.offset = s->_raw_size;
1191 s->_raw_size += 4;
1192 dyn = htab->root.dynamic_sections_created;
1193 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
1194 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1195 }
1196 else
1197 h->got.offset = (bfd_vma) -1;
1198
5a15f56f
AM
1199 /* In the shared -Bsymbolic case, discard space allocated for
1200 dynamic relocs against symbols which turn out to be defined
12d0ee4a
AM
1201 in regular objects. For the normal shared case, discard space
1202 for relocs that have become local due to symbol visibility
1203 changes. For the non-shared case, discard space for symbols
1204 which turn out to need copy relocs or are not dynamic. */
1205
5a15f56f
AM
1206 eh = (struct elf_i386_link_hash_entry *) h;
1207 if (eh->dyn_relocs == NULL)
1208 return true;
1209
1210 if (!info->shared
1211 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1212 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
8e1d4bbb
AM
1213 || (htab->root.dynamic_sections_created
1214 && (h->root.type == bfd_link_hash_undefweak
1215 || h->root.type == bfd_link_hash_undefined))))
5a15f56f
AM
1216 {
1217 /* Make sure this symbol is output as a dynamic symbol.
1218 Undefined weak syms won't yet be marked as dynamic. */
1219 if (h->dynindx == -1
1220 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1221 {
1222 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1223 return false;
1224 }
1225
1226 /* If that succeeded, we know we'll be keeping all the relocs. */
1227 if (h->dynindx != -1)
1228 return true;
1229 }
1230
1231 if (!info->shared
1232 || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1233 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1234 || info->symbolic)))
12d0ee4a 1235 {
ffb2e45b 1236 struct elf_i386_dyn_relocs *c;
12d0ee4a 1237
ffb2e45b 1238 for (c = eh->dyn_relocs; c != NULL; c = c->next)
12d0ee4a
AM
1239 c->section->_raw_size -= c->count * sizeof (Elf32_External_Rel);
1240 }
1241
6725bdbf
AM
1242 return true;
1243}
1244
252b5132
RH
1245/* Set the sizes of the dynamic sections. */
1246
1247static boolean
1248elf_i386_size_dynamic_sections (output_bfd, info)
db6751f2 1249 bfd *output_bfd ATTRIBUTE_UNUSED;
252b5132
RH
1250 struct bfd_link_info *info;
1251{
6725bdbf 1252 struct elf_i386_link_hash_table *htab;
252b5132
RH
1253 bfd *dynobj;
1254 asection *s;
252b5132 1255 boolean relocs;
161d71a6 1256 bfd *i;
252b5132 1257
6725bdbf
AM
1258 htab = elf_i386_hash_table (info);
1259 dynobj = htab->root.dynobj;
ffb2e45b
AM
1260 if (dynobj == NULL)
1261 abort ();
252b5132 1262
6725bdbf 1263 if (htab->root.dynamic_sections_created)
252b5132
RH
1264 {
1265 /* Set the contents of the .interp section to the interpreter. */
1266 if (! info->shared)
1267 {
1268 s = bfd_get_section_by_name (dynobj, ".interp");
ffb2e45b
AM
1269 if (s == NULL)
1270 abort ();
252b5132
RH
1271 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1272 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1273 }
161d71a6 1274 }
6725bdbf 1275
161d71a6
L
1276 /* Set up .got offsets for local syms. */
1277 for (i = info->input_bfds; i; i = i->link_next)
1278 {
1279 bfd_signed_vma *local_got;
1280 bfd_signed_vma *end_local_got;
1281 bfd_size_type locsymcount;
1282 Elf_Internal_Shdr *symtab_hdr;
1283 asection *srel;
6725bdbf 1284
161d71a6
L
1285 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
1286 continue;
6725bdbf 1287
161d71a6
L
1288 local_got = elf_local_got_refcounts (i);
1289 if (!local_got)
1290 continue;
6725bdbf 1291
161d71a6
L
1292 symtab_hdr = &elf_tdata (i)->symtab_hdr;
1293 locsymcount = symtab_hdr->sh_info;
1294 end_local_got = local_got + locsymcount;
1295 s = htab->sgot;
1296 srel = htab->srelgot;
1297 for (; local_got < end_local_got; ++local_got)
1298 {
1299 if (*local_got > 0)
6725bdbf 1300 {
161d71a6
L
1301 *local_got = s->_raw_size;
1302 s->_raw_size += 4;
1303 if (info->shared)
1304 srel->_raw_size += sizeof (Elf32_External_Rel);
6725bdbf 1305 }
161d71a6
L
1306 else
1307 *local_got = (bfd_vma) -1;
6725bdbf 1308 }
252b5132 1309 }
6725bdbf 1310
12d0ee4a
AM
1311 /* Allocate global sym .plt and .got entries. Also discard all
1312 unneeded relocs. */
6725bdbf 1313 elf_link_hash_traverse (&htab->root,
12d0ee4a 1314 allocate_plt_and_got_and_discard_relocs,
6725bdbf 1315 (PTR) info);
252b5132 1316
5a15f56f
AM
1317 /* We now have determined the sizes of the various dynamic sections.
1318 Allocate memory for them. */
252b5132 1319 relocs = false;
252b5132
RH
1320 for (s = dynobj->sections; s != NULL; s = s->next)
1321 {
252b5132
RH
1322 if ((s->flags & SEC_LINKER_CREATED) == 0)
1323 continue;
1324
6725bdbf
AM
1325 if (s == htab->splt
1326 || s == htab->sgot
1327 || s == htab->sgotplt)
252b5132 1328 {
6725bdbf
AM
1329 /* Strip this section if we don't need it; see the
1330 comment below. */
252b5132 1331 }
6725bdbf 1332 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
252b5132
RH
1333 {
1334 if (s->_raw_size == 0)
1335 {
1336 /* If we don't need this section, strip it from the
1337 output file. This is mostly to handle .rel.bss and
1338 .rel.plt. We must create both sections in
1339 create_dynamic_sections, because they must be created
1340 before the linker maps input sections to output
1341 sections. The linker does that before
1342 adjust_dynamic_symbol is called, and it is that
1343 function which decides whether anything needs to go
1344 into these sections. */
252b5132
RH
1345 }
1346 else
1347 {
6725bdbf 1348 if (s != htab->srelplt)
db6751f2 1349 relocs = true;
252b5132
RH
1350
1351 /* We use the reloc_count field as a counter if we need
1352 to copy relocs into the output file. */
1353 s->reloc_count = 0;
1354 }
1355 }
6725bdbf 1356 else
252b5132
RH
1357 {
1358 /* It's not one of our sections, so don't allocate space. */
1359 continue;
1360 }
1361
6725bdbf 1362 if (s->_raw_size == 0)
252b5132 1363 {
7f8d5fc9 1364 _bfd_strip_section_from_output (info, s);
252b5132
RH
1365 continue;
1366 }
1367
f69da49f
AM
1368 /* Allocate memory for the section contents. We use bfd_zalloc
1369 here in case unused entries are not reclaimed before the
1370 section's contents are written out. This should not happen,
1371 but this way if it does, we get a R_386_NONE reloc instead
1372 of garbage. */
7a9af8c4 1373 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
6725bdbf 1374 if (s->contents == NULL)
252b5132
RH
1375 return false;
1376 }
1377
6725bdbf 1378 if (htab->root.dynamic_sections_created)
252b5132
RH
1379 {
1380 /* Add some entries to the .dynamic section. We fill in the
1381 values later, in elf_i386_finish_dynamic_sections, but we
1382 must add the entries now so that we get the correct size for
1383 the .dynamic section. The DT_DEBUG entry is filled in by the
1384 dynamic linker and used by the debugger. */
1385 if (! info->shared)
1386 {
1387 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1388 return false;
1389 }
1390
6725bdbf 1391 if (htab->splt->_raw_size != 0)
252b5132
RH
1392 {
1393 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1394 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1395 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL)
1396 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1397 return false;
1398 }
1399
1400 if (relocs)
1401 {
1402 if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0)
1403 || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0)
1404 || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT,
1405 sizeof (Elf32_External_Rel)))
1406 return false;
1407 }
1408
db6751f2 1409 if ((info->flags & DF_TEXTREL) != 0)
252b5132
RH
1410 {
1411 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1412 return false;
1413 }
1414 }
1415
1416 return true;
1417}
1418
252b5132
RH
1419/* Relocate an i386 ELF section. */
1420
1421static boolean
1422elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
1423 contents, relocs, local_syms, local_sections)
1424 bfd *output_bfd;
1425 struct bfd_link_info *info;
1426 bfd *input_bfd;
1427 asection *input_section;
1428 bfd_byte *contents;
1429 Elf_Internal_Rela *relocs;
1430 Elf_Internal_Sym *local_syms;
1431 asection **local_sections;
1432{
6725bdbf 1433 struct elf_i386_link_hash_table *htab;
252b5132
RH
1434 bfd *dynobj;
1435 Elf_Internal_Shdr *symtab_hdr;
1436 struct elf_link_hash_entry **sym_hashes;
1437 bfd_vma *local_got_offsets;
252b5132
RH
1438 asection *sreloc;
1439 Elf_Internal_Rela *rel;
1440 Elf_Internal_Rela *relend;
1441
6725bdbf
AM
1442 htab = elf_i386_hash_table (info);
1443 dynobj = htab->root.dynobj;
252b5132
RH
1444 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1445 sym_hashes = elf_sym_hashes (input_bfd);
1446 local_got_offsets = elf_local_got_offsets (input_bfd);
1447
252b5132 1448 sreloc = NULL;
252b5132
RH
1449 rel = relocs;
1450 relend = relocs + input_section->reloc_count;
1451 for (; rel < relend; rel++)
1452 {
1453 int r_type;
1454 reloc_howto_type *howto;
1455 unsigned long r_symndx;
1456 struct elf_link_hash_entry *h;
1457 Elf_Internal_Sym *sym;
1458 asection *sec;
ffb2e45b 1459 bfd_vma off;
252b5132 1460 bfd_vma relocation;
83be169b 1461 boolean unresolved_reloc;
252b5132 1462 bfd_reloc_status_type r;
1b452ec6 1463 unsigned int indx;
252b5132
RH
1464
1465 r_type = ELF32_R_TYPE (rel->r_info);
dc47f327
AM
1466 if (r_type == (int) R_386_GNU_VTINHERIT
1467 || r_type == (int) R_386_GNU_VTENTRY)
252b5132 1468 continue;
dc47f327 1469
1b452ec6 1470 if ((indx = (unsigned) r_type) >= R_386_standard
dc47f327
AM
1471 && ((indx = (unsigned) r_type - R_386_ext_offset) - R_386_standard
1472 >= R_386_ext - R_386_standard))
252b5132
RH
1473 {
1474 bfd_set_error (bfd_error_bad_value);
1475 return false;
1476 }
1b452ec6 1477 howto = elf_howto_table + indx;
252b5132
RH
1478
1479 r_symndx = ELF32_R_SYM (rel->r_info);
1480
1481 if (info->relocateable)
1482 {
1483 /* This is a relocateable link. We don't have to change
1484 anything, unless the reloc is against a section symbol,
1485 in which case we have to adjust according to where the
1486 section symbol winds up in the output section. */
1487 if (r_symndx < symtab_hdr->sh_info)
1488 {
1489 sym = local_syms + r_symndx;
1490 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1491 {
1492 bfd_vma val;
1493
1494 sec = local_sections[r_symndx];
1495 val = bfd_get_32 (input_bfd, contents + rel->r_offset);
1496 val += sec->output_offset + sym->st_value;
1497 bfd_put_32 (input_bfd, val, contents + rel->r_offset);
1498 }
1499 }
1500
1501 continue;
1502 }
1503
1504 /* This is a final link. */
1505 h = NULL;
1506 sym = NULL;
1507 sec = NULL;
83be169b 1508 unresolved_reloc = false;
252b5132
RH
1509 if (r_symndx < symtab_hdr->sh_info)
1510 {
1511 sym = local_syms + r_symndx;
1512 sec = local_sections[r_symndx];
1513 relocation = (sec->output_section->vma
1514 + sec->output_offset
1515 + sym->st_value);
1516 }
1517 else
1518 {
1519 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1520 while (h->root.type == bfd_link_hash_indirect
1521 || h->root.type == bfd_link_hash_warning)
1522 h = (struct elf_link_hash_entry *) h->root.u.i.link;
ffb2e45b 1523
6725bdbf 1524 relocation = 0;
252b5132
RH
1525 if (h->root.type == bfd_link_hash_defined
1526 || h->root.type == bfd_link_hash_defweak)
1527 {
1528 sec = h->root.u.def.section;
83be169b
AM
1529 if (sec->output_section == NULL)
1530 /* Set a flag that will be cleared later if we find a
1531 relocation value for this symbol. output_section
1532 is typically NULL for symbols satisfied by a shared
1533 library. */
1534 unresolved_reloc = true;
252b5132
RH
1535 else
1536 relocation = (h->root.u.def.value
1537 + sec->output_section->vma
1538 + sec->output_offset);
1539 }
1540 else if (h->root.type == bfd_link_hash_undefweak)
6725bdbf 1541 ;
3a27a730
L
1542 else if (info->shared && !info->symbolic
1543 && !info->no_undefined
1544 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
6725bdbf 1545 ;
252b5132
RH
1546 else
1547 {
1548 if (! ((*info->callbacks->undefined_symbol)
1549 (info, h->root.root.string, input_bfd,
5cc7c785 1550 input_section, rel->r_offset,
3a27a730
L
1551 (!info->shared || info->no_undefined
1552 || ELF_ST_VISIBILITY (h->other)))))
252b5132 1553 return false;
252b5132
RH
1554 }
1555 }
1556
1557 switch (r_type)
1558 {
1559 case R_386_GOT32:
1560 /* Relocation is to the entry for this symbol in the global
1561 offset table. */
ffb2e45b
AM
1562 if (htab->sgot == NULL)
1563 abort ();
252b5132
RH
1564
1565 if (h != NULL)
1566 {
6725bdbf 1567 boolean dyn;
252b5132
RH
1568
1569 off = h->got.offset;
6725bdbf
AM
1570 dyn = htab->root.dynamic_sections_created;
1571 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
252b5132 1572 || (info->shared
6725bdbf
AM
1573 && (info->symbolic
1574 || h->dynindx == -1
1575 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
252b5132
RH
1576 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1577 {
1578 /* This is actually a static link, or it is a
1579 -Bsymbolic link and the symbol is defined
1580 locally, or the symbol was forced to be local
1581 because of a version file. We must initialize
1582 this entry in the global offset table. Since the
1583 offset must always be a multiple of 4, we use the
1584 least significant bit to record whether we have
1585 initialized it already.
1586
1587 When doing a dynamic link, we create a .rel.got
1588 relocation entry to initialize the value. This
1589 is done in the finish_dynamic_symbol routine. */
1590 if ((off & 1) != 0)
1591 off &= ~1;
1592 else
1593 {
1594 bfd_put_32 (output_bfd, relocation,
6725bdbf 1595 htab->sgot->contents + off);
252b5132
RH
1596 h->got.offset |= 1;
1597 }
1598 }
8c694914
AM
1599 else
1600 unresolved_reloc = false;
252b5132
RH
1601 }
1602 else
1603 {
ffb2e45b
AM
1604 if (local_got_offsets == NULL)
1605 abort ();
252b5132
RH
1606
1607 off = local_got_offsets[r_symndx];
1608
1609 /* The offset must always be a multiple of 4. We use
83be169b
AM
1610 the least significant bit to record whether we have
1611 already generated the necessary reloc. */
252b5132
RH
1612 if ((off & 1) != 0)
1613 off &= ~1;
1614 else
1615 {
6725bdbf
AM
1616 bfd_put_32 (output_bfd, relocation,
1617 htab->sgot->contents + off);
252b5132
RH
1618
1619 if (info->shared)
1620 {
1621 asection *srelgot;
1622 Elf_Internal_Rel outrel;
1623
6725bdbf 1624 srelgot = htab->srelgot;
ffb2e45b
AM
1625 if (srelgot == NULL)
1626 abort ();
252b5132 1627
6725bdbf
AM
1628 outrel.r_offset = (htab->sgot->output_section->vma
1629 + htab->sgot->output_offset
252b5132
RH
1630 + off);
1631 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
1632 bfd_elf32_swap_reloc_out (output_bfd, &outrel,
1633 (((Elf32_External_Rel *)
1634 srelgot->contents)
1635 + srelgot->reloc_count));
1636 ++srelgot->reloc_count;
1637 }
1638
1639 local_got_offsets[r_symndx] |= 1;
1640 }
252b5132
RH
1641 }
1642
ffb2e45b
AM
1643 if (off >= (bfd_vma) -2)
1644 abort ();
1645
1646 relocation = htab->sgot->output_offset + off;
252b5132
RH
1647 break;
1648
1649 case R_386_GOTOFF:
1650 /* Relocation is relative to the start of the global offset
1651 table. */
1652
252b5132
RH
1653 /* Note that sgot->output_offset is not involved in this
1654 calculation. We always want the start of .got. If we
1655 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1656 permitted by the ABI, we might have to change this
1657 calculation. */
6725bdbf 1658 relocation -= htab->sgot->output_section->vma;
252b5132
RH
1659 break;
1660
1661 case R_386_GOTPC:
1662 /* Use global offset table as symbol value. */
6725bdbf 1663 relocation = htab->sgot->output_section->vma;
83be169b 1664 unresolved_reloc = false;
252b5132
RH
1665 break;
1666
1667 case R_386_PLT32:
1668 /* Relocation is to the entry for this symbol in the
1669 procedure linkage table. */
1670
dd5724d5 1671 /* Resolve a PLT32 reloc against a local symbol directly,
83be169b 1672 without using the procedure linkage table. */
252b5132
RH
1673 if (h == NULL)
1674 break;
1675
dd5724d5 1676 if (h->plt.offset == (bfd_vma) -1
6725bdbf 1677 || htab->splt == NULL)
252b5132
RH
1678 {
1679 /* We didn't make a PLT entry for this symbol. This
83be169b
AM
1680 happens when statically linking PIC code, or when
1681 using -Bsymbolic. */
252b5132
RH
1682 break;
1683 }
1684
6725bdbf
AM
1685 relocation = (htab->splt->output_section->vma
1686 + htab->splt->output_offset
252b5132 1687 + h->plt.offset);
83be169b 1688 unresolved_reloc = false;
252b5132
RH
1689 break;
1690
1691 case R_386_32:
1692 case R_386_PC32:
12d0ee4a
AM
1693 if ((info->shared
1694 && (input_section->flags & SEC_ALLOC) != 0
1695 && (r_type != R_386_PC32
1696 || (h != NULL
1697 && h->dynindx != -1
1698 && (! info->symbolic
1699 || (h->elf_link_hash_flags
1700 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1701 || (!info->shared
1702 && (input_section->flags & SEC_ALLOC) != 0
1703 && h != NULL
1704 && h->dynindx != -1
1705 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
28d0b90e
AM
1706 && ((h->elf_link_hash_flags
1707 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1708 || h->root.type == bfd_link_hash_undefweak
1709 || h->root.type == bfd_link_hash_undefined)))
252b5132
RH
1710 {
1711 Elf_Internal_Rel outrel;
1712 boolean skip, relocate;
1713
1714 /* When generating a shared object, these relocations
1715 are copied into the output file to be resolved at run
1716 time. */
1717
1718 if (sreloc == NULL)
1719 {
1720 const char *name;
1721
1722 name = (bfd_elf_string_from_elf_section
1723 (input_bfd,
1724 elf_elfheader (input_bfd)->e_shstrndx,
1725 elf_section_data (input_section)->rel_hdr.sh_name));
1726 if (name == NULL)
1727 return false;
1728
c8492176
L
1729 if (strncmp (name, ".rel", 4) != 0
1730 || strcmp (bfd_get_section_name (input_bfd,
1731 input_section),
1732 name + 4) != 0)
1733 {
1734 if (input_bfd->my_archive)
ffb2e45b
AM
1735 (*_bfd_error_handler)\
1736 (_("%s(%s): bad relocation section name `%s\'"),
1737 bfd_get_filename (input_bfd->my_archive),
1738 bfd_get_filename (input_bfd),
1739 name);
c8492176 1740 else
ffb2e45b
AM
1741 (*_bfd_error_handler)
1742 (_("%s: bad relocation section name `%s\'"),
1743 bfd_get_filename (input_bfd),
1744 name);
c8492176
L
1745 return false;
1746 }
252b5132
RH
1747
1748 sreloc = bfd_get_section_by_name (dynobj, name);
ffb2e45b
AM
1749 if (sreloc == NULL)
1750 abort ();
252b5132
RH
1751 }
1752
1753 skip = false;
1754
1755 if (elf_section_data (input_section)->stab_info == NULL)
1756 outrel.r_offset = rel->r_offset;
1757 else
1758 {
1759 bfd_vma off;
1760
1761 off = (_bfd_stab_section_offset
12d0ee4a 1762 (output_bfd, htab->root.stab_info, input_section,
252b5132
RH
1763 &elf_section_data (input_section)->stab_info,
1764 rel->r_offset));
1765 if (off == (bfd_vma) -1)
1766 skip = true;
1767 outrel.r_offset = off;
1768 }
1769
1770 outrel.r_offset += (input_section->output_section->vma
1771 + input_section->output_offset);
1772
1773 if (skip)
1774 {
1775 memset (&outrel, 0, sizeof outrel);
1776 relocate = false;
1777 }
5a15f56f
AM
1778 else if (h != NULL
1779 && h->dynindx != -1
1780 && (r_type == R_386_PC32
1781 || !info->shared
1782 || !info->symbolic
1783 || (h->elf_link_hash_flags
1784 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1785
252b5132 1786 {
252b5132 1787 relocate = false;
5a15f56f 1788 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
252b5132
RH
1789 }
1790 else
1791 {
5a15f56f
AM
1792 /* This symbol is local, or marked to become local. */
1793 relocate = true;
1794 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
252b5132
RH
1795 }
1796
1797 bfd_elf32_swap_reloc_out (output_bfd, &outrel,
1798 (((Elf32_External_Rel *)
1799 sreloc->contents)
1800 + sreloc->reloc_count));
1801 ++sreloc->reloc_count;
1802
1803 /* If this reloc is against an external symbol, we do
1804 not want to fiddle with the addend. Otherwise, we
1805 need to include the symbol value so that it becomes
1806 an addend for the dynamic reloc. */
1807 if (! relocate)
1808 continue;
1809 }
1810
1811 break;
1812
1813 default:
1814 break;
1815 }
1816
8c694914
AM
1817 /* FIXME: Why do we allow debugging sections to escape this error?
1818 More importantly, why do we not emit dynamic relocs for
1819 R_386_32 above in debugging sections (which are ! SEC_ALLOC)?
1820 If we had emitted the dynamic reloc, we could remove the
1821 fudge here. */
1822 if (unresolved_reloc
1823 && !(info->shared
1824 && (input_section->flags & SEC_DEBUGGING) != 0
1825 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
83be169b
AM
1826 (*_bfd_error_handler)
1827 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1828 bfd_get_filename (input_bfd),
1829 bfd_get_section_name (input_bfd, input_section),
1830 (long) rel->r_offset,
1831 h->root.root.string);
1832
252b5132
RH
1833 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1834 contents, rel->r_offset,
1835 relocation, (bfd_vma) 0);
1836
ffb2e45b 1837 switch (r)
252b5132 1838 {
ffb2e45b
AM
1839 case bfd_reloc_ok:
1840 break;
1841
1842 case bfd_reloc_overflow:
1843 {
1844 const char *name;
1845
1846 if (h != NULL)
1847 name = h->root.root.string;
1848 else
252b5132 1849 {
ffb2e45b
AM
1850 name = bfd_elf_string_from_elf_section (input_bfd,
1851 symtab_hdr->sh_link,
1852 sym->st_name);
1853 if (name == NULL)
252b5132 1854 return false;
ffb2e45b
AM
1855 if (*name == '\0')
1856 name = bfd_section_name (input_bfd, sec);
252b5132 1857 }
ffb2e45b
AM
1858 if (! ((*info->callbacks->reloc_overflow)
1859 (info, name, howto->name, (bfd_vma) 0,
1860 input_bfd, input_section, rel->r_offset)))
1861 return false;
1862 }
1863 break;
1864
1865 default:
1866 case bfd_reloc_outofrange:
1867 abort ();
1868 break;
252b5132
RH
1869 }
1870 }
1871
1872 return true;
1873}
1874
1875/* Finish up dynamic symbol handling. We set the contents of various
1876 dynamic sections here. */
1877
1878static boolean
1879elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym)
1880 bfd *output_bfd;
1881 struct bfd_link_info *info;
1882 struct elf_link_hash_entry *h;
1883 Elf_Internal_Sym *sym;
1884{
6725bdbf 1885 struct elf_i386_link_hash_table *htab;
252b5132
RH
1886 bfd *dynobj;
1887
6725bdbf
AM
1888 htab = elf_i386_hash_table (info);
1889 dynobj = htab->root.dynobj;
252b5132
RH
1890
1891 if (h->plt.offset != (bfd_vma) -1)
1892 {
252b5132
RH
1893 bfd_vma plt_index;
1894 bfd_vma got_offset;
1895 Elf_Internal_Rel rel;
1896
1897 /* This symbol has an entry in the procedure linkage table. Set
1898 it up. */
1899
ffb2e45b
AM
1900 if (h->dynindx == -1
1901 || htab->splt == NULL
1902 || htab->sgotplt == NULL
1903 || htab->srelplt == NULL)
1904 abort ();
252b5132
RH
1905
1906 /* Get the index in the procedure linkage table which
1907 corresponds to this symbol. This is the index of this symbol
1908 in all the symbols for which we are making plt entries. The
1909 first entry in the procedure linkage table is reserved. */
1910 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1911
1912 /* Get the offset into the .got table of the entry that
1913 corresponds to this function. Each .got entry is 4 bytes.
1914 The first three are reserved. */
1915 got_offset = (plt_index + 3) * 4;
1916
1917 /* Fill in the entry in the procedure linkage table. */
1918 if (! info->shared)
1919 {
6725bdbf 1920 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
252b5132
RH
1921 PLT_ENTRY_SIZE);
1922 bfd_put_32 (output_bfd,
6725bdbf
AM
1923 (htab->sgotplt->output_section->vma
1924 + htab->sgotplt->output_offset
252b5132 1925 + got_offset),
6725bdbf 1926 htab->splt->contents + h->plt.offset + 2);
252b5132
RH
1927 }
1928 else
1929 {
6725bdbf 1930 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
252b5132
RH
1931 PLT_ENTRY_SIZE);
1932 bfd_put_32 (output_bfd, got_offset,
6725bdbf 1933 htab->splt->contents + h->plt.offset + 2);
252b5132
RH
1934 }
1935
1936 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
6725bdbf 1937 htab->splt->contents + h->plt.offset + 7);
252b5132 1938 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
6725bdbf 1939 htab->splt->contents + h->plt.offset + 12);
252b5132
RH
1940
1941 /* Fill in the entry in the global offset table. */
1942 bfd_put_32 (output_bfd,
6725bdbf
AM
1943 (htab->splt->output_section->vma
1944 + htab->splt->output_offset
252b5132
RH
1945 + h->plt.offset
1946 + 6),
6725bdbf 1947 htab->sgotplt->contents + got_offset);
252b5132
RH
1948
1949 /* Fill in the entry in the .rel.plt section. */
6725bdbf
AM
1950 rel.r_offset = (htab->sgotplt->output_section->vma
1951 + htab->sgotplt->output_offset
252b5132
RH
1952 + got_offset);
1953 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
1954 bfd_elf32_swap_reloc_out (output_bfd, &rel,
6725bdbf 1955 ((Elf32_External_Rel *) htab->srelplt->contents
252b5132
RH
1956 + plt_index));
1957
1958 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1959 {
1960 /* Mark the symbol as undefined, rather than as defined in
1961 the .plt section. Leave the value alone. */
1962 sym->st_shndx = SHN_UNDEF;
1963 }
1964 }
1965
1966 if (h->got.offset != (bfd_vma) -1)
1967 {
252b5132
RH
1968 Elf_Internal_Rel rel;
1969
1970 /* This symbol has an entry in the global offset table. Set it
1971 up. */
1972
ffb2e45b
AM
1973 if (htab->sgot == NULL || htab->srelgot == NULL)
1974 abort ();
252b5132 1975
6725bdbf
AM
1976 rel.r_offset = (htab->sgot->output_section->vma
1977 + htab->sgot->output_offset
252b5132
RH
1978 + (h->got.offset &~ 1));
1979
dd5724d5
AM
1980 /* If this is a static link, or it is a -Bsymbolic link and the
1981 symbol is defined locally or was forced to be local because
1982 of a version file, we just want to emit a RELATIVE reloc.
252b5132
RH
1983 The entry in the global offset table will already have been
1984 initialized in the relocate_section function. */
6725bdbf
AM
1985 if (info->shared
1986 && (info->symbolic
1987 || h->dynindx == -1
1988 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
1989 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
dd5724d5 1990 {
6725bdbf 1991 BFD_ASSERT((h->got.offset & 1) != 0);
dd5724d5
AM
1992 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
1993 }
252b5132
RH
1994 else
1995 {
dd5724d5 1996 BFD_ASSERT((h->got.offset & 1) == 0);
6725bdbf
AM
1997 bfd_put_32 (output_bfd, (bfd_vma) 0,
1998 htab->sgot->contents + h->got.offset);
252b5132
RH
1999 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
2000 }
2001
2002 bfd_elf32_swap_reloc_out (output_bfd, &rel,
6725bdbf
AM
2003 ((Elf32_External_Rel *) htab->srelgot->contents
2004 + htab->srelgot->reloc_count));
2005 ++htab->srelgot->reloc_count;
252b5132
RH
2006 }
2007
791987af 2008 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
252b5132 2009 {
252b5132
RH
2010 Elf_Internal_Rel rel;
2011
2012 /* This symbol needs a copy reloc. Set it up. */
2013
ffb2e45b
AM
2014 if (h->dynindx == -1
2015 || (h->root.type != bfd_link_hash_defined
2016 && h->root.type != bfd_link_hash_defweak)
2017 || htab->srelbss == NULL)
2018 abort ();
252b5132
RH
2019
2020 rel.r_offset = (h->root.u.def.value
2021 + h->root.u.def.section->output_section->vma
2022 + h->root.u.def.section->output_offset);
2023 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
2024 bfd_elf32_swap_reloc_out (output_bfd, &rel,
6725bdbf
AM
2025 ((Elf32_External_Rel *) htab->srelbss->contents
2026 + htab->srelbss->reloc_count));
2027 ++htab->srelbss->reloc_count;
252b5132
RH
2028 }
2029
2030 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2031 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2032 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2033 sym->st_shndx = SHN_ABS;
2034
2035 return true;
2036}
2037
2038/* Finish up the dynamic sections. */
2039
2040static boolean
2041elf_i386_finish_dynamic_sections (output_bfd, info)
2042 bfd *output_bfd;
2043 struct bfd_link_info *info;
2044{
6725bdbf 2045 struct elf_i386_link_hash_table *htab;
252b5132 2046 bfd *dynobj;
252b5132
RH
2047 asection *sdyn;
2048
6725bdbf
AM
2049 htab = elf_i386_hash_table (info);
2050 dynobj = htab->root.dynobj;
252b5132
RH
2051 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2052
6725bdbf 2053 if (htab->root.dynamic_sections_created)
252b5132 2054 {
252b5132
RH
2055 Elf32_External_Dyn *dyncon, *dynconend;
2056
ffb2e45b
AM
2057 if (sdyn == NULL || htab->sgot == NULL)
2058 abort ();
252b5132
RH
2059
2060 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2061 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2062 for (; dyncon < dynconend; dyncon++)
2063 {
2064 Elf_Internal_Dyn dyn;
252b5132
RH
2065
2066 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2067
2068 switch (dyn.d_tag)
2069 {
2070 default:
2071 break;
2072
2073 case DT_PLTGOT:
6725bdbf
AM
2074 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2075 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2076 break;
2077
252b5132 2078 case DT_JMPREL:
6725bdbf 2079 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
252b5132
RH
2080 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2081 break;
2082
2083 case DT_PLTRELSZ:
6725bdbf
AM
2084 if (htab->srelplt->output_section->_cooked_size != 0)
2085 dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size;
252b5132 2086 else
6725bdbf 2087 dyn.d_un.d_val = htab->srelplt->output_section->_raw_size;
252b5132
RH
2088 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2089 break;
2090
2091 case DT_RELSZ:
2092 /* My reading of the SVR4 ABI indicates that the
2093 procedure linkage table relocs (DT_JMPREL) should be
2094 included in the overall relocs (DT_REL). This is
2095 what Solaris does. However, UnixWare can not handle
2096 that case. Therefore, we override the DT_RELSZ entry
2097 here to make it not include the JMPREL relocs. Since
2098 the linker script arranges for .rel.plt to follow all
2099 other relocation sections, we don't have to worry
2100 about changing the DT_REL entry. */
6725bdbf 2101 if (htab->srelplt != NULL)
252b5132 2102 {
6725bdbf
AM
2103 if (htab->srelplt->output_section->_cooked_size != 0)
2104 dyn.d_un.d_val -= htab->srelplt->output_section->_cooked_size;
252b5132 2105 else
6725bdbf 2106 dyn.d_un.d_val -= htab->srelplt->output_section->_raw_size;
252b5132
RH
2107 }
2108 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2109 break;
2110 }
2111 }
2112
2113 /* Fill in the first entry in the procedure linkage table. */
6725bdbf 2114 if (htab->splt && htab->splt->_raw_size > 0)
252b5132
RH
2115 {
2116 if (info->shared)
6725bdbf
AM
2117 memcpy (htab->splt->contents,
2118 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
252b5132
RH
2119 else
2120 {
6725bdbf
AM
2121 memcpy (htab->splt->contents,
2122 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
252b5132 2123 bfd_put_32 (output_bfd,
6725bdbf
AM
2124 (htab->sgotplt->output_section->vma
2125 + htab->sgotplt->output_offset
2126 + 4),
2127 htab->splt->contents + 2);
252b5132 2128 bfd_put_32 (output_bfd,
6725bdbf
AM
2129 (htab->sgotplt->output_section->vma
2130 + htab->sgotplt->output_offset
2131 + 8),
2132 htab->splt->contents + 8);
252b5132
RH
2133 }
2134
2135 /* UnixWare sets the entsize of .plt to 4, although that doesn't
2136 really seem like the right value. */
6725bdbf
AM
2137 elf_section_data (htab->splt->output_section)
2138 ->this_hdr.sh_entsize = 4;
252b5132
RH
2139 }
2140 }
2141
12d0ee4a 2142 if (htab->sgotplt)
252b5132 2143 {
12d0ee4a
AM
2144 /* Fill in the first three entries in the global offset table. */
2145 if (htab->sgotplt->_raw_size > 0)
2146 {
2147 bfd_put_32 (output_bfd,
2148 (sdyn == NULL ? (bfd_vma) 0
2149 : sdyn->output_section->vma + sdyn->output_offset),
2150 htab->sgotplt->contents);
2151 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
2152 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
2153 }
252b5132 2154
12d0ee4a
AM
2155 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
2156 }
252b5132
RH
2157 return true;
2158}
2159
dd484e5c
L
2160/* Set the correct type for an x86 ELF section. We do this by the
2161 section name, which is a hack, but ought to work. */
2162
2163static boolean
2164elf_i386_fake_sections (abfd, hdr, sec)
2165 bfd *abfd ATTRIBUTE_UNUSED;
2166 Elf32_Internal_Shdr *hdr;
2167 asection *sec;
2168{
2169 register const char *name;
2170
2171 name = bfd_get_section_name (abfd, sec);
2172
2173 if (strcmp (name, ".reloc") == 0)
2174 /*
2175 * This is an ugly, but unfortunately necessary hack that is
2176 * needed when producing EFI binaries on x86. It tells
2177 * elf.c:elf_fake_sections() not to consider ".reloc" as a section
2178 * containing ELF relocation info. We need this hack in order to
2179 * be able to generate ELF binaries that can be translated into
2180 * EFI applications (which are essentially COFF objects). Those
2181 * files contain a COFF ".reloc" section inside an ELFNN object,
2182 * which would normally cause BFD to segfault because it would
2183 * attempt to interpret this section as containing relocation
2184 * entries for section "oc". With this hack enabled, ".reloc"
2185 * will be treated as a normal data section, which will avoid the
2186 * segfault. However, you won't be able to create an ELFNN binary
2187 * with a section named "oc" that needs relocations, but that's
2188 * the kind of ugly side-effects you get when detecting section
2189 * types based on their names... In practice, this limitation is
2190 * unlikely to bite.
2191 */
2192 hdr->sh_type = SHT_PROGBITS;
2193
2194 return true;
2195}
2196
db6751f2
JJ
2197static enum elf_reloc_type_class
2198elf_i386_reloc_type_class (type)
2199 int type;
2200{
2201 switch (type)
2202 {
2203 case R_386_RELATIVE:
2204 return reloc_class_relative;
2205 case R_386_JUMP_SLOT:
2206 return reloc_class_plt;
2207 case R_386_COPY:
2208 return reloc_class_copy;
2209 default:
2210 return reloc_class_normal;
2211 }
2212}
dd484e5c 2213
252b5132
RH
2214#define TARGET_LITTLE_SYM bfd_elf32_i386_vec
2215#define TARGET_LITTLE_NAME "elf32-i386"
2216#define ELF_ARCH bfd_arch_i386
2217#define ELF_MACHINE_CODE EM_386
2218#define ELF_MAXPAGESIZE 0x1000
252b5132
RH
2219
2220#define elf_backend_can_gc_sections 1
2221#define elf_backend_want_got_plt 1
2222#define elf_backend_plt_readonly 1
2223#define elf_backend_want_plt_sym 0
2224#define elf_backend_got_header_size 12
2225#define elf_backend_plt_header_size PLT_ENTRY_SIZE
2226
dd5724d5
AM
2227#define elf_info_to_howto elf_i386_info_to_howto
2228#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
2229
dd5724d5
AM
2230#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
2231#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
2232#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
2233
2234#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
2235#define elf_backend_check_relocs elf_i386_check_relocs
6725bdbf 2236#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
dd5724d5
AM
2237#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
2238#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
2239#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
2240#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
2241#define elf_backend_relocate_section elf_i386_relocate_section
2242#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
83be169b 2243#define elf_backend_fake_sections elf_i386_fake_sections
db6751f2 2244#define elf_backend_reloc_type_class elf_i386_reloc_type_class
dd5724d5 2245
252b5132 2246#include "elf32-target.h"
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