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[thirdparty/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
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.
11
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.
16
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. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26
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 *, Elf_Internal_Rela *));
31 static void elf_i386_info_to_howto_rel
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_i386_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static bfd_boolean elf_i386_grok_prstatus
36 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
37 static bfd_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
42 PARAMS ((bfd *));
43 static bfd_boolean create_got_section
44 PARAMS ((bfd *, struct bfd_link_info *));
45 static bfd_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_backend_data *, struct elf_link_hash_entry *,
49 struct elf_link_hash_entry *));
50 static int elf_i386_tls_transition
51 PARAMS ((struct bfd_link_info *, int, int));
52
53 static bfd_boolean elf_i386_mkobject
54 PARAMS ((bfd *));
55 static bfd_boolean elf_i386_object_p
56 PARAMS ((bfd *));
57 static bfd_boolean elf_i386_check_relocs
58 PARAMS ((bfd *, struct bfd_link_info *, asection *,
59 const Elf_Internal_Rela *));
60 static asection *elf_i386_gc_mark_hook
61 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
62 struct elf_link_hash_entry *, Elf_Internal_Sym *));
63 static bfd_boolean elf_i386_gc_sweep_hook
64 PARAMS ((bfd *, struct bfd_link_info *, asection *,
65 const Elf_Internal_Rela *));
66 static bfd_boolean elf_i386_adjust_dynamic_symbol
67 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
68 static bfd_boolean allocate_dynrelocs
69 PARAMS ((struct elf_link_hash_entry *, PTR));
70 static bfd_boolean readonly_dynrelocs
71 PARAMS ((struct elf_link_hash_entry *, PTR));
72 static bfd_boolean elf_i386_fake_sections
73 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
74 static bfd_boolean elf_i386_size_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_vma dtpoff_base
77 PARAMS ((struct bfd_link_info *));
78 static bfd_vma tpoff
79 PARAMS ((struct bfd_link_info *, bfd_vma));
80 static bfd_boolean elf_i386_relocate_section
81 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
82 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
83 static bfd_boolean elf_i386_finish_dynamic_symbol
84 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
85 Elf_Internal_Sym *));
86 static enum elf_reloc_type_class elf_i386_reloc_type_class
87 PARAMS ((const Elf_Internal_Rela *));
88 static bfd_boolean elf_i386_finish_dynamic_sections
89 PARAMS ((bfd *, struct bfd_link_info *));
90
91 #define USE_REL 1 /* 386 uses REL relocations instead of RELA. */
92
93 #include "elf/i386.h"
94
95 static reloc_howto_type elf_howto_table[]=
96 {
97 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_NONE",
99 TRUE, 0x00000000, 0x00000000, FALSE),
100 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_32",
102 TRUE, 0xffffffff, 0xffffffff, FALSE),
103 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC32",
105 TRUE, 0xffffffff, 0xffffffff, TRUE),
106 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_GOT32",
108 TRUE, 0xffffffff, 0xffffffff, FALSE),
109 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_386_PLT32",
111 TRUE, 0xffffffff, 0xffffffff, TRUE),
112 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_386_COPY",
114 TRUE, 0xffffffff, 0xffffffff, FALSE),
115 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
117 TRUE, 0xffffffff, 0xffffffff, FALSE),
118 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_RELATIVE",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_GOTOFF",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_GOTPC",
129 TRUE, 0xffffffff, 0xffffffff, TRUE),
130
131 /* We have a gap in the reloc numbers here.
132 R_386_standard counts the number up to this point, and
133 R_386_ext_offset is the value to subtract from a reloc type of
134 R_386_16 thru R_386_PC8 to form an index into this table. */
135 #define R_386_standard ((unsigned int) R_386_GOTPC + 1)
136 #define R_386_ext_offset ((unsigned int) R_386_TLS_TPOFF - R_386_standard)
137
138 /* These relocs are a GNU extension. */
139 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
141 TRUE, 0xffffffff, 0xffffffff, FALSE),
142 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_386_TLS_IE",
144 TRUE, 0xffffffff, 0xffffffff, FALSE),
145 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
147 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_386_TLS_LE",
150 TRUE, 0xffffffff, 0xffffffff, FALSE),
151 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_386_TLS_GD",
153 TRUE, 0xffffffff, 0xffffffff, FALSE),
154 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_386_TLS_LDM",
156 TRUE, 0xffffffff, 0xffffffff, FALSE),
157 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
158 bfd_elf_generic_reloc, "R_386_16",
159 TRUE, 0xffff, 0xffff, FALSE),
160 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_386_PC16",
162 TRUE, 0xffff, 0xffff, TRUE),
163 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_386_8",
165 TRUE, 0xff, 0xff, FALSE),
166 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
167 bfd_elf_generic_reloc, "R_386_PC8",
168 TRUE, 0xff, 0xff, TRUE),
169
170 #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset)
171 #define R_386_tls_offset ((unsigned int) R_386_TLS_LDO_32 - R_386_ext)
172 /* These are common with Solaris TLS implementation. */
173 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
175 TRUE, 0xffffffff, 0xffffffff, FALSE),
176 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
178 TRUE, 0xffffffff, 0xffffffff, FALSE),
179 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
181 TRUE, 0xffffffff, 0xffffffff, FALSE),
182 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
183 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
184 TRUE, 0xffffffff, 0xffffffff, FALSE),
185 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
186 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
187 TRUE, 0xffffffff, 0xffffffff, FALSE),
188 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
189 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
190 TRUE, 0xffffffff, 0xffffffff, FALSE),
191
192 /* Another gap. */
193 #define R_386_tls ((unsigned int) R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
194 #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_tls)
195
196 /* GNU extension to record C++ vtable hierarchy. */
197 HOWTO (R_386_GNU_VTINHERIT, /* type */
198 0, /* rightshift */
199 2, /* size (0 = byte, 1 = short, 2 = long) */
200 0, /* bitsize */
201 FALSE, /* pc_relative */
202 0, /* bitpos */
203 complain_overflow_dont, /* complain_on_overflow */
204 NULL, /* special_function */
205 "R_386_GNU_VTINHERIT", /* name */
206 FALSE, /* partial_inplace */
207 0, /* src_mask */
208 0, /* dst_mask */
209 FALSE), /* pcrel_offset */
210
211 /* GNU extension to record C++ vtable member usage. */
212 HOWTO (R_386_GNU_VTENTRY, /* type */
213 0, /* rightshift */
214 2, /* size (0 = byte, 1 = short, 2 = long) */
215 0, /* bitsize */
216 FALSE, /* pc_relative */
217 0, /* bitpos */
218 complain_overflow_dont, /* complain_on_overflow */
219 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
220 "R_386_GNU_VTENTRY", /* name */
221 FALSE, /* partial_inplace */
222 0, /* src_mask */
223 0, /* dst_mask */
224 FALSE) /* pcrel_offset */
225
226 #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
227
228 };
229
230 #ifdef DEBUG_GEN_RELOC
231 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
232 #else
233 #define TRACE(str)
234 #endif
235
236 static reloc_howto_type *
237 elf_i386_reloc_type_lookup (abfd, code)
238 bfd *abfd ATTRIBUTE_UNUSED;
239 bfd_reloc_code_real_type code;
240 {
241 switch (code)
242 {
243 case BFD_RELOC_NONE:
244 TRACE ("BFD_RELOC_NONE");
245 return &elf_howto_table[(unsigned int) R_386_NONE ];
246
247 case BFD_RELOC_32:
248 TRACE ("BFD_RELOC_32");
249 return &elf_howto_table[(unsigned int) R_386_32 ];
250
251 case BFD_RELOC_CTOR:
252 TRACE ("BFD_RELOC_CTOR");
253 return &elf_howto_table[(unsigned int) R_386_32 ];
254
255 case BFD_RELOC_32_PCREL:
256 TRACE ("BFD_RELOC_PC32");
257 return &elf_howto_table[(unsigned int) R_386_PC32 ];
258
259 case BFD_RELOC_386_GOT32:
260 TRACE ("BFD_RELOC_386_GOT32");
261 return &elf_howto_table[(unsigned int) R_386_GOT32 ];
262
263 case BFD_RELOC_386_PLT32:
264 TRACE ("BFD_RELOC_386_PLT32");
265 return &elf_howto_table[(unsigned int) R_386_PLT32 ];
266
267 case BFD_RELOC_386_COPY:
268 TRACE ("BFD_RELOC_386_COPY");
269 return &elf_howto_table[(unsigned int) R_386_COPY ];
270
271 case BFD_RELOC_386_GLOB_DAT:
272 TRACE ("BFD_RELOC_386_GLOB_DAT");
273 return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ];
274
275 case BFD_RELOC_386_JUMP_SLOT:
276 TRACE ("BFD_RELOC_386_JUMP_SLOT");
277 return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ];
278
279 case BFD_RELOC_386_RELATIVE:
280 TRACE ("BFD_RELOC_386_RELATIVE");
281 return &elf_howto_table[(unsigned int) R_386_RELATIVE ];
282
283 case BFD_RELOC_386_GOTOFF:
284 TRACE ("BFD_RELOC_386_GOTOFF");
285 return &elf_howto_table[(unsigned int) R_386_GOTOFF ];
286
287 case BFD_RELOC_386_GOTPC:
288 TRACE ("BFD_RELOC_386_GOTPC");
289 return &elf_howto_table[(unsigned int) R_386_GOTPC ];
290
291 /* These relocs are a GNU extension. */
292 case BFD_RELOC_386_TLS_TPOFF:
293 TRACE ("BFD_RELOC_386_TLS_TPOFF");
294 return &elf_howto_table[(unsigned int) R_386_TLS_TPOFF - R_386_ext_offset];
295
296 case BFD_RELOC_386_TLS_IE:
297 TRACE ("BFD_RELOC_386_TLS_IE");
298 return &elf_howto_table[(unsigned int) R_386_TLS_IE - R_386_ext_offset];
299
300 case BFD_RELOC_386_TLS_GOTIE:
301 TRACE ("BFD_RELOC_386_TLS_GOTIE");
302 return &elf_howto_table[(unsigned int) R_386_TLS_GOTIE - R_386_ext_offset];
303
304 case BFD_RELOC_386_TLS_LE:
305 TRACE ("BFD_RELOC_386_TLS_LE");
306 return &elf_howto_table[(unsigned int) R_386_TLS_LE - R_386_ext_offset];
307
308 case BFD_RELOC_386_TLS_GD:
309 TRACE ("BFD_RELOC_386_TLS_GD");
310 return &elf_howto_table[(unsigned int) R_386_TLS_GD - R_386_ext_offset];
311
312 case BFD_RELOC_386_TLS_LDM:
313 TRACE ("BFD_RELOC_386_TLS_LDM");
314 return &elf_howto_table[(unsigned int) R_386_TLS_LDM - R_386_ext_offset];
315
316 case BFD_RELOC_16:
317 TRACE ("BFD_RELOC_16");
318 return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset];
319
320 case BFD_RELOC_16_PCREL:
321 TRACE ("BFD_RELOC_16_PCREL");
322 return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset];
323
324 case BFD_RELOC_8:
325 TRACE ("BFD_RELOC_8");
326 return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset];
327
328 case BFD_RELOC_8_PCREL:
329 TRACE ("BFD_RELOC_8_PCREL");
330 return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset];
331
332 /* Common with Sun TLS implementation. */
333 case BFD_RELOC_386_TLS_LDO_32:
334 TRACE ("BFD_RELOC_386_TLS_LDO_32");
335 return &elf_howto_table[(unsigned int) R_386_TLS_LDO_32 - R_386_tls_offset];
336
337 case BFD_RELOC_386_TLS_IE_32:
338 TRACE ("BFD_RELOC_386_TLS_IE_32");
339 return &elf_howto_table[(unsigned int) R_386_TLS_IE_32 - R_386_tls_offset];
340
341 case BFD_RELOC_386_TLS_LE_32:
342 TRACE ("BFD_RELOC_386_TLS_LE_32");
343 return &elf_howto_table[(unsigned int) R_386_TLS_LE_32 - R_386_tls_offset];
344
345 case BFD_RELOC_386_TLS_DTPMOD32:
346 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
347 return &elf_howto_table[(unsigned int) R_386_TLS_DTPMOD32 - R_386_tls_offset];
348
349 case BFD_RELOC_386_TLS_DTPOFF32:
350 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
351 return &elf_howto_table[(unsigned int) R_386_TLS_DTPOFF32 - R_386_tls_offset];
352
353 case BFD_RELOC_386_TLS_TPOFF32:
354 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
355 return &elf_howto_table[(unsigned int) R_386_TLS_TPOFF32 - R_386_tls_offset];
356
357 case BFD_RELOC_VTABLE_INHERIT:
358 TRACE ("BFD_RELOC_VTABLE_INHERIT");
359 return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT
360 - R_386_vt_offset];
361
362 case BFD_RELOC_VTABLE_ENTRY:
363 TRACE ("BFD_RELOC_VTABLE_ENTRY");
364 return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY
365 - R_386_vt_offset];
366
367 default:
368 break;
369 }
370
371 TRACE ("Unknown");
372 return 0;
373 }
374
375 static void
376 elf_i386_info_to_howto (abfd, cache_ptr, dst)
377 bfd *abfd ATTRIBUTE_UNUSED;
378 arelent *cache_ptr ATTRIBUTE_UNUSED;
379 Elf_Internal_Rela *dst ATTRIBUTE_UNUSED;
380 {
381 abort ();
382 }
383
384 static void
385 elf_i386_info_to_howto_rel (abfd, cache_ptr, dst)
386 bfd *abfd ATTRIBUTE_UNUSED;
387 arelent *cache_ptr;
388 Elf_Internal_Rela *dst;
389 {
390 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
391 unsigned int indx;
392
393 if ((indx = r_type) >= R_386_standard
394 && ((indx = r_type - R_386_ext_offset) - R_386_standard
395 >= R_386_ext - R_386_standard)
396 && ((indx = r_type - R_386_tls_offset) - R_386_ext
397 >= R_386_tls - R_386_ext)
398 && ((indx = r_type - R_386_vt_offset) - R_386_tls
399 >= R_386_vt - R_386_tls))
400 {
401 (*_bfd_error_handler) (_("%s: invalid relocation type %d"),
402 bfd_archive_filename (abfd), (int) r_type);
403 indx = (unsigned int) R_386_NONE;
404 }
405 cache_ptr->howto = &elf_howto_table[indx];
406 }
407
408 /* Return whether a symbol name implies a local label. The UnixWare
409 2.1 cc generates temporary symbols that start with .X, so we
410 recognize them here. FIXME: do other SVR4 compilers also use .X?.
411 If so, we should move the .X recognition into
412 _bfd_elf_is_local_label_name. */
413
414 static bfd_boolean
415 elf_i386_is_local_label_name (abfd, name)
416 bfd *abfd;
417 const char *name;
418 {
419 if (name[0] == '.' && name[1] == 'X')
420 return TRUE;
421
422 return _bfd_elf_is_local_label_name (abfd, name);
423 }
424 \f
425 /* Support for core dump NOTE sections. */
426 static bfd_boolean
427 elf_i386_grok_prstatus (abfd, note)
428 bfd *abfd;
429 Elf_Internal_Note *note;
430 {
431 int offset;
432 size_t raw_size;
433
434 switch (note->descsz)
435 {
436 default:
437 return FALSE;
438
439 case 144: /* Linux/i386 */
440 /* pr_cursig */
441 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
442
443 /* pr_pid */
444 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
445
446 /* pr_reg */
447 offset = 72;
448 raw_size = 68;
449
450 break;
451 }
452
453 /* Make a ".reg/999" section. */
454 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
455 raw_size, note->descpos + offset);
456 }
457
458 static bfd_boolean
459 elf_i386_grok_psinfo (abfd, note)
460 bfd *abfd;
461 Elf_Internal_Note *note;
462 {
463 switch (note->descsz)
464 {
465 default:
466 return FALSE;
467
468 case 124: /* Linux/i386 elf_prpsinfo */
469 elf_tdata (abfd)->core_program
470 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
471 elf_tdata (abfd)->core_command
472 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
473 }
474
475 /* Note that for some reason, a spurious space is tacked
476 onto the end of the args in some (at least one anyway)
477 implementations, so strip it off if it exists. */
478
479 {
480 char *command = elf_tdata (abfd)->core_command;
481 int n = strlen (command);
482
483 if (0 < n && command[n - 1] == ' ')
484 command[n - 1] = '\0';
485 }
486
487 return TRUE;
488 }
489 \f
490 /* Functions for the i386 ELF linker.
491
492 In order to gain some understanding of code in this file without
493 knowing all the intricate details of the linker, note the
494 following:
495
496 Functions named elf_i386_* are called by external routines, other
497 functions are only called locally. elf_i386_* functions appear
498 in this file more or less in the order in which they are called
499 from external routines. eg. elf_i386_check_relocs is called
500 early in the link process, elf_i386_finish_dynamic_sections is
501 one of the last functions. */
502
503
504 /* The name of the dynamic interpreter. This is put in the .interp
505 section. */
506
507 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
508
509 /* The size in bytes of an entry in the procedure linkage table. */
510
511 #define PLT_ENTRY_SIZE 16
512
513 /* The first entry in an absolute procedure linkage table looks like
514 this. See the SVR4 ABI i386 supplement to see how this works. */
515
516 static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
517 {
518 0xff, 0x35, /* pushl contents of address */
519 0, 0, 0, 0, /* replaced with address of .got + 4. */
520 0xff, 0x25, /* jmp indirect */
521 0, 0, 0, 0, /* replaced with address of .got + 8. */
522 0, 0, 0, 0 /* pad out to 16 bytes. */
523 };
524
525 /* Subsequent entries in an absolute procedure linkage table look like
526 this. */
527
528 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
529 {
530 0xff, 0x25, /* jmp indirect */
531 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
532 0x68, /* pushl immediate */
533 0, 0, 0, 0, /* replaced with offset into relocation table. */
534 0xe9, /* jmp relative */
535 0, 0, 0, 0 /* replaced with offset to start of .plt. */
536 };
537
538 /* The first entry in a PIC procedure linkage table look like this. */
539
540 static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
541 {
542 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
543 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
544 0, 0, 0, 0 /* pad out to 16 bytes. */
545 };
546
547 /* Subsequent entries in a PIC procedure linkage table look like this. */
548
549 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
550 {
551 0xff, 0xa3, /* jmp *offset(%ebx) */
552 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
553 0x68, /* pushl immediate */
554 0, 0, 0, 0, /* replaced with offset into relocation table. */
555 0xe9, /* jmp relative */
556 0, 0, 0, 0 /* replaced with offset to start of .plt. */
557 };
558
559 /* The i386 linker needs to keep track of the number of relocs that it
560 decides to copy as dynamic relocs in check_relocs for each symbol.
561 This is so that it can later discard them if they are found to be
562 unnecessary. We store the information in a field extending the
563 regular ELF linker hash table. */
564
565 struct elf_i386_dyn_relocs
566 {
567 struct elf_i386_dyn_relocs *next;
568
569 /* The input section of the reloc. */
570 asection *sec;
571
572 /* Total number of relocs copied for the input section. */
573 bfd_size_type count;
574
575 /* Number of pc-relative relocs copied for the input section. */
576 bfd_size_type pc_count;
577 };
578
579 /* i386 ELF linker hash entry. */
580
581 struct elf_i386_link_hash_entry
582 {
583 struct elf_link_hash_entry elf;
584
585 /* Track dynamic relocs copied for this symbol. */
586 struct elf_i386_dyn_relocs *dyn_relocs;
587
588 #define GOT_UNKNOWN 0
589 #define GOT_NORMAL 1
590 #define GOT_TLS_GD 2
591 #define GOT_TLS_IE 4
592 #define GOT_TLS_IE_POS 5
593 #define GOT_TLS_IE_NEG 6
594 #define GOT_TLS_IE_BOTH 7
595 unsigned char tls_type;
596 };
597
598 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
599
600 struct elf_i386_obj_tdata
601 {
602 struct elf_obj_tdata root;
603
604 /* tls_type for each local got entry. */
605 char *local_got_tls_type;
606 };
607
608 #define elf_i386_tdata(abfd) \
609 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
610
611 #define elf_i386_local_got_tls_type(abfd) \
612 (elf_i386_tdata (abfd)->local_got_tls_type)
613
614 static bfd_boolean
615 elf_i386_mkobject (abfd)
616 bfd *abfd;
617 {
618 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
619 abfd->tdata.any = bfd_zalloc (abfd, amt);
620 if (abfd->tdata.any == NULL)
621 return FALSE;
622 return TRUE;
623 }
624
625 static bfd_boolean
626 elf_i386_object_p (abfd)
627 bfd *abfd;
628 {
629 /* Allocate our special target data. */
630 struct elf_i386_obj_tdata *new_tdata;
631 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
632 new_tdata = bfd_zalloc (abfd, amt);
633 if (new_tdata == NULL)
634 return FALSE;
635 new_tdata->root = *abfd->tdata.elf_obj_data;
636 abfd->tdata.any = new_tdata;
637 return TRUE;
638 }
639
640 /* i386 ELF linker hash table. */
641
642 struct elf_i386_link_hash_table
643 {
644 struct elf_link_hash_table elf;
645
646 /* Short-cuts to get to dynamic linker sections. */
647 asection *sgot;
648 asection *sgotplt;
649 asection *srelgot;
650 asection *splt;
651 asection *srelplt;
652 asection *sdynbss;
653 asection *srelbss;
654
655 union {
656 bfd_signed_vma refcount;
657 bfd_vma offset;
658 } tls_ldm_got;
659
660 /* Small local sym to section mapping cache. */
661 struct sym_sec_cache sym_sec;
662 };
663
664 /* Get the i386 ELF linker hash table from a link_info structure. */
665
666 #define elf_i386_hash_table(p) \
667 ((struct elf_i386_link_hash_table *) ((p)->hash))
668
669 /* Create an entry in an i386 ELF linker hash table. */
670
671 static struct bfd_hash_entry *
672 link_hash_newfunc (entry, table, string)
673 struct bfd_hash_entry *entry;
674 struct bfd_hash_table *table;
675 const char *string;
676 {
677 /* Allocate the structure if it has not already been allocated by a
678 subclass. */
679 if (entry == NULL)
680 {
681 entry = bfd_hash_allocate (table,
682 sizeof (struct elf_i386_link_hash_entry));
683 if (entry == NULL)
684 return entry;
685 }
686
687 /* Call the allocation method of the superclass. */
688 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
689 if (entry != NULL)
690 {
691 struct elf_i386_link_hash_entry *eh;
692
693 eh = (struct elf_i386_link_hash_entry *) entry;
694 eh->dyn_relocs = NULL;
695 eh->tls_type = GOT_UNKNOWN;
696 }
697
698 return entry;
699 }
700
701 /* Create an i386 ELF linker hash table. */
702
703 static struct bfd_link_hash_table *
704 elf_i386_link_hash_table_create (abfd)
705 bfd *abfd;
706 {
707 struct elf_i386_link_hash_table *ret;
708 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
709
710 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
711 if (ret == NULL)
712 return NULL;
713
714 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
715 {
716 free (ret);
717 return NULL;
718 }
719
720 ret->sgot = NULL;
721 ret->sgotplt = NULL;
722 ret->srelgot = NULL;
723 ret->splt = NULL;
724 ret->srelplt = NULL;
725 ret->sdynbss = NULL;
726 ret->srelbss = NULL;
727 ret->tls_ldm_got.refcount = 0;
728 ret->sym_sec.abfd = NULL;
729
730 return &ret->elf.root;
731 }
732
733 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
734 shortcuts to them in our hash table. */
735
736 static bfd_boolean
737 create_got_section (dynobj, info)
738 bfd *dynobj;
739 struct bfd_link_info *info;
740 {
741 struct elf_i386_link_hash_table *htab;
742
743 if (! _bfd_elf_create_got_section (dynobj, info))
744 return FALSE;
745
746 htab = elf_i386_hash_table (info);
747 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
748 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
749 if (!htab->sgot || !htab->sgotplt)
750 abort ();
751
752 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
753 if (htab->srelgot == NULL
754 || ! bfd_set_section_flags (dynobj, htab->srelgot,
755 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
756 | SEC_IN_MEMORY | SEC_LINKER_CREATED
757 | SEC_READONLY))
758 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
759 return FALSE;
760 return TRUE;
761 }
762
763 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
764 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
765 hash table. */
766
767 static bfd_boolean
768 elf_i386_create_dynamic_sections (dynobj, info)
769 bfd *dynobj;
770 struct bfd_link_info *info;
771 {
772 struct elf_i386_link_hash_table *htab;
773
774 htab = elf_i386_hash_table (info);
775 if (!htab->sgot && !create_got_section (dynobj, info))
776 return FALSE;
777
778 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
779 return FALSE;
780
781 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
782 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
783 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
784 if (!info->shared)
785 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
786
787 if (!htab->splt || !htab->srelplt || !htab->sdynbss
788 || (!info->shared && !htab->srelbss))
789 abort ();
790
791 return TRUE;
792 }
793
794 /* Copy the extra info we tack onto an elf_link_hash_entry. */
795
796 static void
797 elf_i386_copy_indirect_symbol (bed, dir, ind)
798 struct elf_backend_data *bed;
799 struct elf_link_hash_entry *dir, *ind;
800 {
801 struct elf_i386_link_hash_entry *edir, *eind;
802
803 edir = (struct elf_i386_link_hash_entry *) dir;
804 eind = (struct elf_i386_link_hash_entry *) ind;
805
806 if (eind->dyn_relocs != NULL)
807 {
808 if (edir->dyn_relocs != NULL)
809 {
810 struct elf_i386_dyn_relocs **pp;
811 struct elf_i386_dyn_relocs *p;
812
813 if (ind->root.type == bfd_link_hash_indirect)
814 abort ();
815
816 /* Add reloc counts against the weak sym to the strong sym
817 list. Merge any entries against the same section. */
818 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
819 {
820 struct elf_i386_dyn_relocs *q;
821
822 for (q = edir->dyn_relocs; q != NULL; q = q->next)
823 if (q->sec == p->sec)
824 {
825 q->pc_count += p->pc_count;
826 q->count += p->count;
827 *pp = p->next;
828 break;
829 }
830 if (q == NULL)
831 pp = &p->next;
832 }
833 *pp = edir->dyn_relocs;
834 }
835
836 edir->dyn_relocs = eind->dyn_relocs;
837 eind->dyn_relocs = NULL;
838 }
839
840 if (ind->root.type == bfd_link_hash_indirect
841 && dir->got.refcount <= 0)
842 {
843 edir->tls_type = eind->tls_type;
844 eind->tls_type = GOT_UNKNOWN;
845 }
846 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
847 }
848
849 static int
850 elf_i386_tls_transition (info, r_type, is_local)
851 struct bfd_link_info *info;
852 int r_type;
853 int is_local;
854 {
855 if (info->shared)
856 return r_type;
857
858 switch (r_type)
859 {
860 case R_386_TLS_GD:
861 case R_386_TLS_IE_32:
862 if (is_local)
863 return R_386_TLS_LE_32;
864 return R_386_TLS_IE_32;
865 case R_386_TLS_IE:
866 case R_386_TLS_GOTIE:
867 if (is_local)
868 return R_386_TLS_LE_32;
869 return r_type;
870 case R_386_TLS_LDM:
871 return R_386_TLS_LE_32;
872 }
873
874 return r_type;
875 }
876
877 /* Look through the relocs for a section during the first phase, and
878 calculate needed space in the global offset table, procedure linkage
879 table, and dynamic reloc sections. */
880
881 static bfd_boolean
882 elf_i386_check_relocs (abfd, info, sec, relocs)
883 bfd *abfd;
884 struct bfd_link_info *info;
885 asection *sec;
886 const Elf_Internal_Rela *relocs;
887 {
888 struct elf_i386_link_hash_table *htab;
889 Elf_Internal_Shdr *symtab_hdr;
890 struct elf_link_hash_entry **sym_hashes;
891 const Elf_Internal_Rela *rel;
892 const Elf_Internal_Rela *rel_end;
893 asection *sreloc;
894
895 if (info->relocateable)
896 return TRUE;
897
898 htab = elf_i386_hash_table (info);
899 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
900 sym_hashes = elf_sym_hashes (abfd);
901
902 sreloc = NULL;
903
904 rel_end = relocs + sec->reloc_count;
905 for (rel = relocs; rel < rel_end; rel++)
906 {
907 unsigned int r_type;
908 unsigned long r_symndx;
909 struct elf_link_hash_entry *h;
910
911 r_symndx = ELF32_R_SYM (rel->r_info);
912 r_type = ELF32_R_TYPE (rel->r_info);
913
914 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
915 {
916 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
917 bfd_archive_filename (abfd),
918 r_symndx);
919 return FALSE;
920 }
921
922 if (r_symndx < symtab_hdr->sh_info)
923 h = NULL;
924 else
925 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
926
927 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
928
929 switch (r_type)
930 {
931 case R_386_TLS_LDM:
932 htab->tls_ldm_got.refcount += 1;
933 goto create_got;
934
935 case R_386_PLT32:
936 /* This symbol requires a procedure linkage table entry. We
937 actually build the entry in adjust_dynamic_symbol,
938 because this might be a case of linking PIC code which is
939 never referenced by a dynamic object, in which case we
940 don't need to generate a procedure linkage table entry
941 after all. */
942
943 /* If this is a local symbol, we resolve it directly without
944 creating a procedure linkage table entry. */
945 if (h == NULL)
946 continue;
947
948 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
949 h->plt.refcount += 1;
950 break;
951
952 case R_386_TLS_IE_32:
953 case R_386_TLS_IE:
954 case R_386_TLS_GOTIE:
955 if (info->shared)
956 info->flags |= DF_STATIC_TLS;
957 /* Fall through */
958
959 case R_386_GOT32:
960 case R_386_TLS_GD:
961 /* This symbol requires a global offset table entry. */
962 {
963 int tls_type, old_tls_type;
964
965 switch (r_type)
966 {
967 default:
968 case R_386_GOT32: tls_type = GOT_NORMAL; break;
969 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
970 case R_386_TLS_IE_32:
971 if (ELF32_R_TYPE (rel->r_info) == r_type)
972 tls_type = GOT_TLS_IE_NEG;
973 else
974 /* If this is a GD->IE transition, we may use either of
975 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
976 tls_type = GOT_TLS_IE;
977 break;
978 case R_386_TLS_IE:
979 case R_386_TLS_GOTIE:
980 tls_type = GOT_TLS_IE_POS; break;
981 }
982
983 if (h != NULL)
984 {
985 h->got.refcount += 1;
986 old_tls_type = elf_i386_hash_entry(h)->tls_type;
987 }
988 else
989 {
990 bfd_signed_vma *local_got_refcounts;
991
992 /* This is a global offset table entry for a local symbol. */
993 local_got_refcounts = elf_local_got_refcounts (abfd);
994 if (local_got_refcounts == NULL)
995 {
996 bfd_size_type size;
997
998 size = symtab_hdr->sh_info;
999 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1000 local_got_refcounts = ((bfd_signed_vma *)
1001 bfd_zalloc (abfd, size));
1002 if (local_got_refcounts == NULL)
1003 return FALSE;
1004 elf_local_got_refcounts (abfd) = local_got_refcounts;
1005 elf_i386_local_got_tls_type (abfd)
1006 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1007 }
1008 local_got_refcounts[r_symndx] += 1;
1009 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1010 }
1011
1012 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1013 tls_type |= old_tls_type;
1014 /* If a TLS symbol is accessed using IE at least once,
1015 there is no point to use dynamic model for it. */
1016 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1017 && (old_tls_type != GOT_TLS_GD
1018 || (tls_type & GOT_TLS_IE) == 0))
1019 {
1020 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1021 tls_type = old_tls_type;
1022 else
1023 {
1024 (*_bfd_error_handler)
1025 (_("%s: `%s' accessed both as normal and thread local symbol"),
1026 bfd_archive_filename (abfd),
1027 h ? h->root.root.string : "<local>");
1028 return FALSE;
1029 }
1030 }
1031
1032 if (old_tls_type != tls_type)
1033 {
1034 if (h != NULL)
1035 elf_i386_hash_entry (h)->tls_type = tls_type;
1036 else
1037 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1038 }
1039 }
1040 /* Fall through */
1041
1042 case R_386_GOTOFF:
1043 case R_386_GOTPC:
1044 create_got:
1045 if (htab->sgot == NULL)
1046 {
1047 if (htab->elf.dynobj == NULL)
1048 htab->elf.dynobj = abfd;
1049 if (!create_got_section (htab->elf.dynobj, info))
1050 return FALSE;
1051 }
1052 if (r_type != R_386_TLS_IE)
1053 break;
1054 /* Fall through */
1055
1056 case R_386_TLS_LE_32:
1057 case R_386_TLS_LE:
1058 if (!info->shared)
1059 break;
1060 info->flags |= DF_STATIC_TLS;
1061 /* Fall through */
1062
1063 case R_386_32:
1064 case R_386_PC32:
1065 if (h != NULL && !info->shared)
1066 {
1067 /* If this reloc is in a read-only section, we might
1068 need a copy reloc. We can't check reliably at this
1069 stage whether the section is read-only, as input
1070 sections have not yet been mapped to output sections.
1071 Tentatively set the flag for now, and correct in
1072 adjust_dynamic_symbol. */
1073 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1074
1075 /* We may need a .plt entry if the function this reloc
1076 refers to is in a shared lib. */
1077 h->plt.refcount += 1;
1078 }
1079
1080 /* If we are creating a shared library, and this is a reloc
1081 against a global symbol, or a non PC relative reloc
1082 against a local symbol, then we need to copy the reloc
1083 into the shared library. However, if we are linking with
1084 -Bsymbolic, we do not need to copy a reloc against a
1085 global symbol which is defined in an object we are
1086 including in the link (i.e., DEF_REGULAR is set). At
1087 this point we have not seen all the input files, so it is
1088 possible that DEF_REGULAR is not set now but will be set
1089 later (it is never cleared). In case of a weak definition,
1090 DEF_REGULAR may be cleared later by a strong definition in
1091 a shared library. We account for that possibility below by
1092 storing information in the relocs_copied field of the hash
1093 table entry. A similar situation occurs when creating
1094 shared libraries and symbol visibility changes render the
1095 symbol local.
1096
1097 If on the other hand, we are creating an executable, we
1098 may need to keep relocations for symbols satisfied by a
1099 dynamic library if we manage to avoid copy relocs for the
1100 symbol. */
1101 if ((info->shared
1102 && (sec->flags & SEC_ALLOC) != 0
1103 && (r_type != R_386_PC32
1104 || (h != NULL
1105 && (! info->symbolic
1106 || h->root.type == bfd_link_hash_defweak
1107 || (h->elf_link_hash_flags
1108 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1109 || (!info->shared
1110 && (sec->flags & SEC_ALLOC) != 0
1111 && h != NULL
1112 && (h->root.type == bfd_link_hash_defweak
1113 || (h->elf_link_hash_flags
1114 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1115 {
1116 struct elf_i386_dyn_relocs *p;
1117 struct elf_i386_dyn_relocs **head;
1118
1119 /* We must copy these reloc types into the output file.
1120 Create a reloc section in dynobj and make room for
1121 this reloc. */
1122 if (sreloc == NULL)
1123 {
1124 const char *name;
1125 bfd *dynobj;
1126 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1127 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1128
1129 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1130 if (name == NULL)
1131 return FALSE;
1132
1133 if (strncmp (name, ".rel", 4) != 0
1134 || strcmp (bfd_get_section_name (abfd, sec),
1135 name + 4) != 0)
1136 {
1137 (*_bfd_error_handler)
1138 (_("%s: bad relocation section name `%s\'"),
1139 bfd_archive_filename (abfd), name);
1140 }
1141
1142 if (htab->elf.dynobj == NULL)
1143 htab->elf.dynobj = abfd;
1144
1145 dynobj = htab->elf.dynobj;
1146 sreloc = bfd_get_section_by_name (dynobj, name);
1147 if (sreloc == NULL)
1148 {
1149 flagword flags;
1150
1151 sreloc = bfd_make_section (dynobj, name);
1152 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1153 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1154 if ((sec->flags & SEC_ALLOC) != 0)
1155 flags |= SEC_ALLOC | SEC_LOAD;
1156 if (sreloc == NULL
1157 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1158 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1159 return FALSE;
1160 }
1161 elf_section_data (sec)->sreloc = sreloc;
1162 }
1163
1164 /* If this is a global symbol, we count the number of
1165 relocations we need for this symbol. */
1166 if (h != NULL)
1167 {
1168 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1169 }
1170 else
1171 {
1172 /* Track dynamic relocs needed for local syms too.
1173 We really need local syms available to do this
1174 easily. Oh well. */
1175
1176 asection *s;
1177 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1178 sec, r_symndx);
1179 if (s == NULL)
1180 return FALSE;
1181
1182 head = ((struct elf_i386_dyn_relocs **)
1183 &elf_section_data (s)->local_dynrel);
1184 }
1185
1186 p = *head;
1187 if (p == NULL || p->sec != sec)
1188 {
1189 bfd_size_type amt = sizeof *p;
1190 p = ((struct elf_i386_dyn_relocs *)
1191 bfd_alloc (htab->elf.dynobj, amt));
1192 if (p == NULL)
1193 return FALSE;
1194 p->next = *head;
1195 *head = p;
1196 p->sec = sec;
1197 p->count = 0;
1198 p->pc_count = 0;
1199 }
1200
1201 p->count += 1;
1202 if (r_type == R_386_PC32)
1203 p->pc_count += 1;
1204 }
1205 break;
1206
1207 /* This relocation describes the C++ object vtable hierarchy.
1208 Reconstruct it for later use during GC. */
1209 case R_386_GNU_VTINHERIT:
1210 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1211 return FALSE;
1212 break;
1213
1214 /* This relocation describes which C++ vtable entries are actually
1215 used. Record for later use during GC. */
1216 case R_386_GNU_VTENTRY:
1217 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1218 return FALSE;
1219 break;
1220
1221 default:
1222 break;
1223 }
1224 }
1225
1226 return TRUE;
1227 }
1228
1229 /* Return the section that should be marked against GC for a given
1230 relocation. */
1231
1232 static asection *
1233 elf_i386_gc_mark_hook (sec, info, rel, h, sym)
1234 asection *sec;
1235 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1236 Elf_Internal_Rela *rel;
1237 struct elf_link_hash_entry *h;
1238 Elf_Internal_Sym *sym;
1239 {
1240 if (h != NULL)
1241 {
1242 switch (ELF32_R_TYPE (rel->r_info))
1243 {
1244 case R_386_GNU_VTINHERIT:
1245 case R_386_GNU_VTENTRY:
1246 break;
1247
1248 default:
1249 switch (h->root.type)
1250 {
1251 case bfd_link_hash_defined:
1252 case bfd_link_hash_defweak:
1253 return h->root.u.def.section;
1254
1255 case bfd_link_hash_common:
1256 return h->root.u.c.p->section;
1257
1258 default:
1259 break;
1260 }
1261 }
1262 }
1263 else
1264 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1265
1266 return NULL;
1267 }
1268
1269 /* Update the got entry reference counts for the section being removed. */
1270
1271 static bfd_boolean
1272 elf_i386_gc_sweep_hook (abfd, info, sec, relocs)
1273 bfd *abfd;
1274 struct bfd_link_info *info;
1275 asection *sec;
1276 const Elf_Internal_Rela *relocs;
1277 {
1278 Elf_Internal_Shdr *symtab_hdr;
1279 struct elf_link_hash_entry **sym_hashes;
1280 bfd_signed_vma *local_got_refcounts;
1281 const Elf_Internal_Rela *rel, *relend;
1282
1283 elf_section_data (sec)->local_dynrel = NULL;
1284
1285 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1286 sym_hashes = elf_sym_hashes (abfd);
1287 local_got_refcounts = elf_local_got_refcounts (abfd);
1288
1289 relend = relocs + sec->reloc_count;
1290 for (rel = relocs; rel < relend; rel++)
1291 {
1292 unsigned long r_symndx;
1293 unsigned int r_type;
1294 struct elf_link_hash_entry *h = NULL;
1295
1296 r_symndx = ELF32_R_SYM (rel->r_info);
1297 if (r_symndx >= symtab_hdr->sh_info)
1298 {
1299 struct elf_i386_link_hash_entry *eh;
1300 struct elf_i386_dyn_relocs **pp;
1301 struct elf_i386_dyn_relocs *p;
1302
1303 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1304 eh = (struct elf_i386_link_hash_entry *) h;
1305
1306 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1307 if (p->sec == sec)
1308 {
1309 /* Everything must go for SEC. */
1310 *pp = p->next;
1311 break;
1312 }
1313 }
1314
1315 r_type = ELF32_R_TYPE (rel->r_info);
1316 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1317 switch (r_type)
1318 {
1319 case R_386_TLS_LDM:
1320 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1321 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1322 break;
1323
1324 case R_386_TLS_GD:
1325 case R_386_TLS_IE_32:
1326 case R_386_TLS_IE:
1327 case R_386_TLS_GOTIE:
1328 case R_386_GOT32:
1329 if (h != NULL)
1330 {
1331 if (h->got.refcount > 0)
1332 h->got.refcount -= 1;
1333 }
1334 else if (local_got_refcounts != NULL)
1335 {
1336 if (local_got_refcounts[r_symndx] > 0)
1337 local_got_refcounts[r_symndx] -= 1;
1338 }
1339 break;
1340
1341 case R_386_32:
1342 case R_386_PC32:
1343 if (info->shared)
1344 break;
1345 /* Fall through */
1346
1347 case R_386_PLT32:
1348 if (h != NULL)
1349 {
1350 if (h->plt.refcount > 0)
1351 h->plt.refcount -= 1;
1352 }
1353 break;
1354
1355 default:
1356 break;
1357 }
1358 }
1359
1360 return TRUE;
1361 }
1362
1363 /* Adjust a symbol defined by a dynamic object and referenced by a
1364 regular object. The current definition is in some section of the
1365 dynamic object, but we're not including those sections. We have to
1366 change the definition to something the rest of the link can
1367 understand. */
1368
1369 static bfd_boolean
1370 elf_i386_adjust_dynamic_symbol (info, h)
1371 struct bfd_link_info *info;
1372 struct elf_link_hash_entry *h;
1373 {
1374 struct elf_i386_link_hash_table *htab;
1375 struct elf_i386_link_hash_entry * eh;
1376 struct elf_i386_dyn_relocs *p;
1377 asection *s;
1378 unsigned int power_of_two;
1379
1380 /* If this is a function, put it in the procedure linkage table. We
1381 will fill in the contents of the procedure linkage table later,
1382 when we know the address of the .got section. */
1383 if (h->type == STT_FUNC
1384 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1385 {
1386 if (h->plt.refcount <= 0
1387 || (! info->shared
1388 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1389 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1390 && h->root.type != bfd_link_hash_undefweak
1391 && h->root.type != bfd_link_hash_undefined))
1392 {
1393 /* This case can occur if we saw a PLT32 reloc in an input
1394 file, but the symbol was never referred to by a dynamic
1395 object, or if all references were garbage collected. In
1396 such a case, we don't actually need to build a procedure
1397 linkage table, and we can just do a PC32 reloc instead. */
1398 h->plt.offset = (bfd_vma) -1;
1399 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1400 }
1401
1402 return TRUE;
1403 }
1404 else
1405 /* It's possible that we incorrectly decided a .plt reloc was
1406 needed for an R_386_PC32 reloc to a non-function sym in
1407 check_relocs. We can't decide accurately between function and
1408 non-function syms in check-relocs; Objects loaded later in
1409 the link may change h->type. So fix it now. */
1410 h->plt.offset = (bfd_vma) -1;
1411
1412 /* If this is a weak symbol, and there is a real definition, the
1413 processor independent code will have arranged for us to see the
1414 real definition first, and we can just use the same value. */
1415 if (h->weakdef != NULL)
1416 {
1417 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1418 || h->weakdef->root.type == bfd_link_hash_defweak);
1419 h->root.u.def.section = h->weakdef->root.u.def.section;
1420 h->root.u.def.value = h->weakdef->root.u.def.value;
1421 return TRUE;
1422 }
1423
1424 /* This is a reference to a symbol defined by a dynamic object which
1425 is not a function. */
1426
1427 /* If we are creating a shared library, we must presume that the
1428 only references to the symbol are via the global offset table.
1429 For such cases we need not do anything here; the relocations will
1430 be handled correctly by relocate_section. */
1431 if (info->shared)
1432 return TRUE;
1433
1434 /* If there are no references to this symbol that do not use the
1435 GOT, we don't need to generate a copy reloc. */
1436 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1437 return TRUE;
1438
1439 /* If -z nocopyreloc was given, we won't generate them either. */
1440 if (info->nocopyreloc)
1441 {
1442 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1443 return TRUE;
1444 }
1445
1446 eh = (struct elf_i386_link_hash_entry *) h;
1447 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1448 {
1449 s = p->sec->output_section;
1450 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1451 break;
1452 }
1453
1454 /* If we didn't find any dynamic relocs in read-only sections, then
1455 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1456 if (p == NULL)
1457 {
1458 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1459 return TRUE;
1460 }
1461
1462 /* We must allocate the symbol in our .dynbss section, which will
1463 become part of the .bss section of the executable. There will be
1464 an entry for this symbol in the .dynsym section. The dynamic
1465 object will contain position independent code, so all references
1466 from the dynamic object to this symbol will go through the global
1467 offset table. The dynamic linker will use the .dynsym entry to
1468 determine the address it must put in the global offset table, so
1469 both the dynamic object and the regular object will refer to the
1470 same memory location for the variable. */
1471
1472 htab = elf_i386_hash_table (info);
1473
1474 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1475 copy the initial value out of the dynamic object and into the
1476 runtime process image. */
1477 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1478 {
1479 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel);
1480 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1481 }
1482
1483 /* We need to figure out the alignment required for this symbol. I
1484 have no idea how ELF linkers handle this. */
1485 power_of_two = bfd_log2 (h->size);
1486 if (power_of_two > 3)
1487 power_of_two = 3;
1488
1489 /* Apply the required alignment. */
1490 s = htab->sdynbss;
1491 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1492 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1493 {
1494 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1495 return FALSE;
1496 }
1497
1498 /* Define the symbol as being at this point in the section. */
1499 h->root.u.def.section = s;
1500 h->root.u.def.value = s->_raw_size;
1501
1502 /* Increment the section size to make room for the symbol. */
1503 s->_raw_size += h->size;
1504
1505 return TRUE;
1506 }
1507
1508 /* This is the condition under which elf_i386_finish_dynamic_symbol
1509 will be called from elflink.h. If elflink.h doesn't call our
1510 finish_dynamic_symbol routine, we'll need to do something about
1511 initializing any .plt and .got entries in elf_i386_relocate_section. */
1512 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1513 ((DYN) \
1514 && ((SHARED) \
1515 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1516 && ((H)->dynindx != -1 \
1517 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1518
1519 /* Allocate space in .plt, .got and associated reloc sections for
1520 dynamic relocs. */
1521
1522 static bfd_boolean
1523 allocate_dynrelocs (h, inf)
1524 struct elf_link_hash_entry *h;
1525 PTR inf;
1526 {
1527 struct bfd_link_info *info;
1528 struct elf_i386_link_hash_table *htab;
1529 struct elf_i386_link_hash_entry *eh;
1530 struct elf_i386_dyn_relocs *p;
1531
1532 if (h->root.type == bfd_link_hash_indirect)
1533 return TRUE;
1534
1535 if (h->root.type == bfd_link_hash_warning)
1536 /* When warning symbols are created, they **replace** the "real"
1537 entry in the hash table, thus we never get to see the real
1538 symbol in a hash traversal. So look at it now. */
1539 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1540
1541 info = (struct bfd_link_info *) inf;
1542 htab = elf_i386_hash_table (info);
1543
1544 if (htab->elf.dynamic_sections_created
1545 && h->plt.refcount > 0)
1546 {
1547 /* Make sure this symbol is output as a dynamic symbol.
1548 Undefined weak syms won't yet be marked as dynamic. */
1549 if (h->dynindx == -1
1550 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1551 {
1552 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1553 return FALSE;
1554 }
1555
1556 if (info->shared
1557 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1558 {
1559 asection *s = htab->splt;
1560
1561 /* If this is the first .plt entry, make room for the special
1562 first entry. */
1563 if (s->_raw_size == 0)
1564 s->_raw_size += PLT_ENTRY_SIZE;
1565
1566 h->plt.offset = s->_raw_size;
1567
1568 /* If this symbol is not defined in a regular file, and we are
1569 not generating a shared library, then set the symbol to this
1570 location in the .plt. This is required to make function
1571 pointers compare as equal between the normal executable and
1572 the shared library. */
1573 if (! info->shared
1574 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1575 {
1576 h->root.u.def.section = s;
1577 h->root.u.def.value = h->plt.offset;
1578 }
1579
1580 /* Make room for this entry. */
1581 s->_raw_size += PLT_ENTRY_SIZE;
1582
1583 /* We also need to make an entry in the .got.plt section, which
1584 will be placed in the .got section by the linker script. */
1585 htab->sgotplt->_raw_size += 4;
1586
1587 /* We also need to make an entry in the .rel.plt section. */
1588 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
1589 }
1590 else
1591 {
1592 h->plt.offset = (bfd_vma) -1;
1593 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1594 }
1595 }
1596 else
1597 {
1598 h->plt.offset = (bfd_vma) -1;
1599 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1600 }
1601
1602 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1603 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1604 if (h->got.refcount > 0
1605 && !info->shared
1606 && h->dynindx == -1
1607 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1608 h->got.offset = (bfd_vma) -1;
1609 else if (h->got.refcount > 0)
1610 {
1611 asection *s;
1612 bfd_boolean dyn;
1613 int tls_type = elf_i386_hash_entry(h)->tls_type;
1614
1615 /* Make sure this symbol is output as a dynamic symbol.
1616 Undefined weak syms won't yet be marked as dynamic. */
1617 if (h->dynindx == -1
1618 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1619 {
1620 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1621 return FALSE;
1622 }
1623
1624 s = htab->sgot;
1625 h->got.offset = s->_raw_size;
1626 s->_raw_size += 4;
1627 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1628 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1629 s->_raw_size += 4;
1630 dyn = htab->elf.dynamic_sections_created;
1631 /* R_386_TLS_IE_32 needs one dynamic relocation,
1632 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1633 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1634 need two), R_386_TLS_GD needs one if local symbol and two if
1635 global. */
1636 if (tls_type == GOT_TLS_IE_BOTH)
1637 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1638 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1639 || (tls_type & GOT_TLS_IE))
1640 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1641 else if (tls_type == GOT_TLS_GD)
1642 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1643 else if (info->shared
1644 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))
1645 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1646 }
1647 else
1648 h->got.offset = (bfd_vma) -1;
1649
1650 eh = (struct elf_i386_link_hash_entry *) h;
1651 if (eh->dyn_relocs == NULL)
1652 return TRUE;
1653
1654 /* In the shared -Bsymbolic case, discard space allocated for
1655 dynamic pc-relative relocs against symbols which turn out to be
1656 defined in regular objects. For the normal shared case, discard
1657 space for pc-relative relocs that have become local due to symbol
1658 visibility changes. */
1659
1660 if (info->shared)
1661 {
1662 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1663 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1664 || info->symbolic))
1665 {
1666 struct elf_i386_dyn_relocs **pp;
1667
1668 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1669 {
1670 p->count -= p->pc_count;
1671 p->pc_count = 0;
1672 if (p->count == 0)
1673 *pp = p->next;
1674 else
1675 pp = &p->next;
1676 }
1677 }
1678 }
1679 else
1680 {
1681 /* For the non-shared case, discard space for relocs against
1682 symbols which turn out to need copy relocs or are not
1683 dynamic. */
1684
1685 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1686 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1687 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1688 || (htab->elf.dynamic_sections_created
1689 && (h->root.type == bfd_link_hash_undefweak
1690 || h->root.type == bfd_link_hash_undefined))))
1691 {
1692 /* Make sure this symbol is output as a dynamic symbol.
1693 Undefined weak syms won't yet be marked as dynamic. */
1694 if (h->dynindx == -1
1695 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1696 {
1697 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1698 return FALSE;
1699 }
1700
1701 /* If that succeeded, we know we'll be keeping all the
1702 relocs. */
1703 if (h->dynindx != -1)
1704 goto keep;
1705 }
1706
1707 eh->dyn_relocs = NULL;
1708
1709 keep: ;
1710 }
1711
1712 /* Finally, allocate space. */
1713 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1714 {
1715 asection *sreloc = elf_section_data (p->sec)->sreloc;
1716 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1717 }
1718
1719 return TRUE;
1720 }
1721
1722 /* Find any dynamic relocs that apply to read-only sections. */
1723
1724 static bfd_boolean
1725 readonly_dynrelocs (h, inf)
1726 struct elf_link_hash_entry *h;
1727 PTR inf;
1728 {
1729 struct elf_i386_link_hash_entry *eh;
1730 struct elf_i386_dyn_relocs *p;
1731
1732 if (h->root.type == bfd_link_hash_warning)
1733 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1734
1735 eh = (struct elf_i386_link_hash_entry *) h;
1736 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1737 {
1738 asection *s = p->sec->output_section;
1739
1740 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1741 {
1742 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1743
1744 info->flags |= DF_TEXTREL;
1745
1746 /* Not an error, just cut short the traversal. */
1747 return FALSE;
1748 }
1749 }
1750 return TRUE;
1751 }
1752
1753 /* Set the sizes of the dynamic sections. */
1754
1755 static bfd_boolean
1756 elf_i386_size_dynamic_sections (output_bfd, info)
1757 bfd *output_bfd ATTRIBUTE_UNUSED;
1758 struct bfd_link_info *info;
1759 {
1760 struct elf_i386_link_hash_table *htab;
1761 bfd *dynobj;
1762 asection *s;
1763 bfd_boolean relocs;
1764 bfd *ibfd;
1765
1766 htab = elf_i386_hash_table (info);
1767 dynobj = htab->elf.dynobj;
1768 if (dynobj == NULL)
1769 abort ();
1770
1771 if (htab->elf.dynamic_sections_created)
1772 {
1773 /* Set the contents of the .interp section to the interpreter. */
1774 if (! info->shared)
1775 {
1776 s = bfd_get_section_by_name (dynobj, ".interp");
1777 if (s == NULL)
1778 abort ();
1779 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1780 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1781 }
1782 }
1783
1784 /* Set up .got offsets for local syms, and space for local dynamic
1785 relocs. */
1786 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1787 {
1788 bfd_signed_vma *local_got;
1789 bfd_signed_vma *end_local_got;
1790 char *local_tls_type;
1791 bfd_size_type locsymcount;
1792 Elf_Internal_Shdr *symtab_hdr;
1793 asection *srel;
1794
1795 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1796 continue;
1797
1798 for (s = ibfd->sections; s != NULL; s = s->next)
1799 {
1800 struct elf_i386_dyn_relocs *p;
1801
1802 for (p = *((struct elf_i386_dyn_relocs **)
1803 &elf_section_data (s)->local_dynrel);
1804 p != NULL;
1805 p = p->next)
1806 {
1807 if (!bfd_is_abs_section (p->sec)
1808 && bfd_is_abs_section (p->sec->output_section))
1809 {
1810 /* Input section has been discarded, either because
1811 it is a copy of a linkonce section or due to
1812 linker script /DISCARD/, so we'll be discarding
1813 the relocs too. */
1814 }
1815 else if (p->count != 0)
1816 {
1817 srel = elf_section_data (p->sec)->sreloc;
1818 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1819 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1820 info->flags |= DF_TEXTREL;
1821 }
1822 }
1823 }
1824
1825 local_got = elf_local_got_refcounts (ibfd);
1826 if (!local_got)
1827 continue;
1828
1829 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1830 locsymcount = symtab_hdr->sh_info;
1831 end_local_got = local_got + locsymcount;
1832 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1833 s = htab->sgot;
1834 srel = htab->srelgot;
1835 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1836 {
1837 if (*local_got > 0)
1838 {
1839 *local_got = s->_raw_size;
1840 s->_raw_size += 4;
1841 if (*local_tls_type == GOT_TLS_GD
1842 || *local_tls_type == GOT_TLS_IE_BOTH)
1843 s->_raw_size += 4;
1844 if (info->shared
1845 || *local_tls_type == GOT_TLS_GD
1846 || (*local_tls_type & GOT_TLS_IE))
1847 {
1848 if (*local_tls_type == GOT_TLS_IE_BOTH)
1849 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1850 else
1851 srel->_raw_size += sizeof (Elf32_External_Rel);
1852 }
1853 }
1854 else
1855 *local_got = (bfd_vma) -1;
1856 }
1857 }
1858
1859 if (htab->tls_ldm_got.refcount > 0)
1860 {
1861 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1862 relocs. */
1863 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1864 htab->sgot->_raw_size += 8;
1865 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1866 }
1867 else
1868 htab->tls_ldm_got.offset = -1;
1869
1870 /* Allocate global sym .plt and .got entries, and space for global
1871 sym dynamic relocs. */
1872 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1873
1874 /* We now have determined the sizes of the various dynamic sections.
1875 Allocate memory for them. */
1876 relocs = FALSE;
1877 for (s = dynobj->sections; s != NULL; s = s->next)
1878 {
1879 if ((s->flags & SEC_LINKER_CREATED) == 0)
1880 continue;
1881
1882 if (s == htab->splt
1883 || s == htab->sgot
1884 || s == htab->sgotplt)
1885 {
1886 /* Strip this section if we don't need it; see the
1887 comment below. */
1888 }
1889 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1890 {
1891 if (s->_raw_size != 0 && s != htab->srelplt)
1892 relocs = TRUE;
1893
1894 /* We use the reloc_count field as a counter if we need
1895 to copy relocs into the output file. */
1896 s->reloc_count = 0;
1897 }
1898 else
1899 {
1900 /* It's not one of our sections, so don't allocate space. */
1901 continue;
1902 }
1903
1904 if (s->_raw_size == 0)
1905 {
1906 /* If we don't need this section, strip it from the
1907 output file. This is mostly to handle .rel.bss and
1908 .rel.plt. We must create both sections in
1909 create_dynamic_sections, because they must be created
1910 before the linker maps input sections to output
1911 sections. The linker does that before
1912 adjust_dynamic_symbol is called, and it is that
1913 function which decides whether anything needs to go
1914 into these sections. */
1915
1916 _bfd_strip_section_from_output (info, s);
1917 continue;
1918 }
1919
1920 /* Allocate memory for the section contents. We use bfd_zalloc
1921 here in case unused entries are not reclaimed before the
1922 section's contents are written out. This should not happen,
1923 but this way if it does, we get a R_386_NONE reloc instead
1924 of garbage. */
1925 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1926 if (s->contents == NULL)
1927 return FALSE;
1928 }
1929
1930 if (htab->elf.dynamic_sections_created)
1931 {
1932 /* Add some entries to the .dynamic section. We fill in the
1933 values later, in elf_i386_finish_dynamic_sections, but we
1934 must add the entries now so that we get the correct size for
1935 the .dynamic section. The DT_DEBUG entry is filled in by the
1936 dynamic linker and used by the debugger. */
1937 #define add_dynamic_entry(TAG, VAL) \
1938 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1939
1940 if (! info->shared)
1941 {
1942 if (!add_dynamic_entry (DT_DEBUG, 0))
1943 return FALSE;
1944 }
1945
1946 if (htab->splt->_raw_size != 0)
1947 {
1948 if (!add_dynamic_entry (DT_PLTGOT, 0)
1949 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1950 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1951 || !add_dynamic_entry (DT_JMPREL, 0))
1952 return FALSE;
1953 }
1954
1955 if (relocs)
1956 {
1957 if (!add_dynamic_entry (DT_REL, 0)
1958 || !add_dynamic_entry (DT_RELSZ, 0)
1959 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1960 return FALSE;
1961
1962 /* If any dynamic relocs apply to a read-only section,
1963 then we need a DT_TEXTREL entry. */
1964 if ((info->flags & DF_TEXTREL) == 0)
1965 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1966 (PTR) info);
1967
1968 if ((info->flags & DF_TEXTREL) != 0)
1969 {
1970 if (!add_dynamic_entry (DT_TEXTREL, 0))
1971 return FALSE;
1972 }
1973 }
1974 }
1975 #undef add_dynamic_entry
1976
1977 return TRUE;
1978 }
1979
1980 /* Set the correct type for an x86 ELF section. We do this by the
1981 section name, which is a hack, but ought to work. */
1982
1983 static bfd_boolean
1984 elf_i386_fake_sections (abfd, hdr, sec)
1985 bfd *abfd ATTRIBUTE_UNUSED;
1986 Elf_Internal_Shdr *hdr;
1987 asection *sec;
1988 {
1989 register const char *name;
1990
1991 name = bfd_get_section_name (abfd, sec);
1992
1993 /* This is an ugly, but unfortunately necessary hack that is
1994 needed when producing EFI binaries on x86. It tells
1995 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1996 containing ELF relocation info. We need this hack in order to
1997 be able to generate ELF binaries that can be translated into
1998 EFI applications (which are essentially COFF objects). Those
1999 files contain a COFF ".reloc" section inside an ELFNN object,
2000 which would normally cause BFD to segfault because it would
2001 attempt to interpret this section as containing relocation
2002 entries for section "oc". With this hack enabled, ".reloc"
2003 will be treated as a normal data section, which will avoid the
2004 segfault. However, you won't be able to create an ELFNN binary
2005 with a section named "oc" that needs relocations, but that's
2006 the kind of ugly side-effects you get when detecting section
2007 types based on their names... In practice, this limitation is
2008 unlikely to bite. */
2009 if (strcmp (name, ".reloc") == 0)
2010 hdr->sh_type = SHT_PROGBITS;
2011
2012 return TRUE;
2013 }
2014
2015 /* Return the base VMA address which should be subtracted from real addresses
2016 when resolving @dtpoff relocation.
2017 This is PT_TLS segment p_vaddr. */
2018
2019 static bfd_vma
2020 dtpoff_base (info)
2021 struct bfd_link_info *info;
2022 {
2023 /* If tls_segment is NULL, we should have signalled an error already. */
2024 if (elf_hash_table (info)->tls_segment == NULL)
2025 return 0;
2026 return elf_hash_table (info)->tls_segment->start;
2027 }
2028
2029 /* Return the relocation value for @tpoff relocation
2030 if STT_TLS virtual address is ADDRESS. */
2031
2032 static bfd_vma
2033 tpoff (info, address)
2034 struct bfd_link_info *info;
2035 bfd_vma address;
2036 {
2037 struct elf_link_tls_segment *tls_segment
2038 = elf_hash_table (info)->tls_segment;
2039
2040 /* If tls_segment is NULL, we should have signalled an error already. */
2041 if (tls_segment == NULL)
2042 return 0;
2043 return (align_power (tls_segment->size, tls_segment->align)
2044 + tls_segment->start - address);
2045 }
2046
2047 /* Relocate an i386 ELF section. */
2048
2049 static bfd_boolean
2050 elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
2051 contents, relocs, local_syms, local_sections)
2052 bfd *output_bfd;
2053 struct bfd_link_info *info;
2054 bfd *input_bfd;
2055 asection *input_section;
2056 bfd_byte *contents;
2057 Elf_Internal_Rela *relocs;
2058 Elf_Internal_Sym *local_syms;
2059 asection **local_sections;
2060 {
2061 struct elf_i386_link_hash_table *htab;
2062 Elf_Internal_Shdr *symtab_hdr;
2063 struct elf_link_hash_entry **sym_hashes;
2064 bfd_vma *local_got_offsets;
2065 Elf_Internal_Rela *rel;
2066 Elf_Internal_Rela *relend;
2067
2068 htab = elf_i386_hash_table (info);
2069 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2070 sym_hashes = elf_sym_hashes (input_bfd);
2071 local_got_offsets = elf_local_got_offsets (input_bfd);
2072
2073 rel = relocs;
2074 relend = relocs + input_section->reloc_count;
2075 for (; rel < relend; rel++)
2076 {
2077 unsigned int r_type;
2078 reloc_howto_type *howto;
2079 unsigned long r_symndx;
2080 struct elf_link_hash_entry *h;
2081 Elf_Internal_Sym *sym;
2082 asection *sec;
2083 bfd_vma off;
2084 bfd_vma relocation;
2085 bfd_boolean unresolved_reloc;
2086 bfd_reloc_status_type r;
2087 unsigned int indx;
2088 int tls_type;
2089
2090 r_type = ELF32_R_TYPE (rel->r_info);
2091 if (r_type == (int) R_386_GNU_VTINHERIT
2092 || r_type == (int) R_386_GNU_VTENTRY)
2093 continue;
2094
2095 if ((indx = (unsigned) r_type) >= R_386_standard
2096 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2097 >= R_386_ext - R_386_standard)
2098 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2099 >= R_386_tls - R_386_ext))
2100 {
2101 bfd_set_error (bfd_error_bad_value);
2102 return FALSE;
2103 }
2104 howto = elf_howto_table + indx;
2105
2106 r_symndx = ELF32_R_SYM (rel->r_info);
2107
2108 if (info->relocateable)
2109 {
2110 bfd_vma val;
2111 bfd_byte *where;
2112
2113 /* This is a relocatable link. We don't have to change
2114 anything, unless the reloc is against a section symbol,
2115 in which case we have to adjust according to where the
2116 section symbol winds up in the output section. */
2117 if (r_symndx >= symtab_hdr->sh_info)
2118 continue;
2119
2120 sym = local_syms + r_symndx;
2121 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2122 continue;
2123
2124 sec = local_sections[r_symndx];
2125 val = sec->output_offset;
2126 if (val == 0)
2127 continue;
2128
2129 where = contents + rel->r_offset;
2130 switch (howto->size)
2131 {
2132 /* FIXME: overflow checks. */
2133 case 0:
2134 val += bfd_get_8 (input_bfd, where);
2135 bfd_put_8 (input_bfd, val, where);
2136 break;
2137 case 1:
2138 val += bfd_get_16 (input_bfd, where);
2139 bfd_put_16 (input_bfd, val, where);
2140 break;
2141 case 2:
2142 val += bfd_get_32 (input_bfd, where);
2143 bfd_put_32 (input_bfd, val, where);
2144 break;
2145 default:
2146 abort ();
2147 }
2148 continue;
2149 }
2150
2151 /* This is a final link. */
2152 h = NULL;
2153 sym = NULL;
2154 sec = NULL;
2155 unresolved_reloc = FALSE;
2156 if (r_symndx < symtab_hdr->sh_info)
2157 {
2158 sym = local_syms + r_symndx;
2159 sec = local_sections[r_symndx];
2160 relocation = (sec->output_section->vma
2161 + sec->output_offset
2162 + sym->st_value);
2163 if ((sec->flags & SEC_MERGE)
2164 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2165 {
2166 asection *msec;
2167 bfd_vma addend;
2168 bfd_byte *where = contents + rel->r_offset;
2169
2170 switch (howto->size)
2171 {
2172 case 0:
2173 addend = bfd_get_8 (input_bfd, where);
2174 if (howto->pc_relative)
2175 {
2176 addend = (addend ^ 0x80) - 0x80;
2177 addend += 1;
2178 }
2179 break;
2180 case 1:
2181 addend = bfd_get_16 (input_bfd, where);
2182 if (howto->pc_relative)
2183 {
2184 addend = (addend ^ 0x8000) - 0x8000;
2185 addend += 2;
2186 }
2187 break;
2188 case 2:
2189 addend = bfd_get_32 (input_bfd, where);
2190 if (howto->pc_relative)
2191 {
2192 addend = (addend ^ 0x80000000) - 0x80000000;
2193 addend += 4;
2194 }
2195 break;
2196 default:
2197 abort ();
2198 }
2199
2200 msec = sec;
2201 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2202 addend -= relocation;
2203 addend += msec->output_section->vma + msec->output_offset;
2204
2205 switch (howto->size)
2206 {
2207 case 0:
2208 /* FIXME: overflow checks. */
2209 if (howto->pc_relative)
2210 addend -= 1;
2211 bfd_put_8 (input_bfd, addend, where);
2212 break;
2213 case 1:
2214 if (howto->pc_relative)
2215 addend -= 2;
2216 bfd_put_16 (input_bfd, addend, where);
2217 break;
2218 case 2:
2219 if (howto->pc_relative)
2220 addend -= 4;
2221 bfd_put_32 (input_bfd, addend, where);
2222 break;
2223 }
2224 }
2225 }
2226 else
2227 {
2228 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2229 while (h->root.type == bfd_link_hash_indirect
2230 || h->root.type == bfd_link_hash_warning)
2231 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2232
2233 relocation = 0;
2234 if (h->root.type == bfd_link_hash_defined
2235 || h->root.type == bfd_link_hash_defweak)
2236 {
2237 sec = h->root.u.def.section;
2238 if (sec->output_section == NULL)
2239 /* Set a flag that will be cleared later if we find a
2240 relocation value for this symbol. output_section
2241 is typically NULL for symbols satisfied by a shared
2242 library. */
2243 unresolved_reloc = TRUE;
2244 else
2245 relocation = (h->root.u.def.value
2246 + sec->output_section->vma
2247 + sec->output_offset);
2248 }
2249 else if (h->root.type == bfd_link_hash_undefweak)
2250 ;
2251 else if (info->shared
2252 && !info->no_undefined
2253 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2254 ;
2255 else
2256 {
2257 if (! ((*info->callbacks->undefined_symbol)
2258 (info, h->root.root.string, input_bfd,
2259 input_section, rel->r_offset,
2260 (!info->shared || info->no_undefined
2261 || ELF_ST_VISIBILITY (h->other)))))
2262 return FALSE;
2263 }
2264 }
2265
2266 switch (r_type)
2267 {
2268 case R_386_GOT32:
2269 /* Relocation is to the entry for this symbol in the global
2270 offset table. */
2271 if (htab->sgot == NULL)
2272 abort ();
2273
2274 if (h != NULL)
2275 {
2276 bfd_boolean dyn;
2277
2278 off = h->got.offset;
2279 dyn = htab->elf.dynamic_sections_created;
2280 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2281 || (info->shared
2282 && (info->symbolic
2283 || h->dynindx == -1
2284 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2285 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
2286 {
2287 /* This is actually a static link, or it is a
2288 -Bsymbolic link and the symbol is defined
2289 locally, or the symbol was forced to be local
2290 because of a version file. We must initialize
2291 this entry in the global offset table. Since the
2292 offset must always be a multiple of 4, we use the
2293 least significant bit to record whether we have
2294 initialized it already.
2295
2296 When doing a dynamic link, we create a .rel.got
2297 relocation entry to initialize the value. This
2298 is done in the finish_dynamic_symbol routine. */
2299 if ((off & 1) != 0)
2300 off &= ~1;
2301 else
2302 {
2303 bfd_put_32 (output_bfd, relocation,
2304 htab->sgot->contents + off);
2305 h->got.offset |= 1;
2306 }
2307 }
2308 else
2309 unresolved_reloc = FALSE;
2310 }
2311 else
2312 {
2313 if (local_got_offsets == NULL)
2314 abort ();
2315
2316 off = local_got_offsets[r_symndx];
2317
2318 /* The offset must always be a multiple of 4. We use
2319 the least significant bit to record whether we have
2320 already generated the necessary reloc. */
2321 if ((off & 1) != 0)
2322 off &= ~1;
2323 else
2324 {
2325 bfd_put_32 (output_bfd, relocation,
2326 htab->sgot->contents + off);
2327
2328 if (info->shared)
2329 {
2330 asection *s;
2331 Elf_Internal_Rela outrel;
2332 bfd_byte *loc;
2333
2334 s = htab->srelgot;
2335 if (s == NULL)
2336 abort ();
2337
2338 outrel.r_offset = (htab->sgot->output_section->vma
2339 + htab->sgot->output_offset
2340 + off);
2341 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2342 loc = s->contents;
2343 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2344 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2345 }
2346
2347 local_got_offsets[r_symndx] |= 1;
2348 }
2349 }
2350
2351 if (off >= (bfd_vma) -2)
2352 abort ();
2353
2354 relocation = htab->sgot->output_offset + off;
2355 break;
2356
2357 case R_386_GOTOFF:
2358 /* Relocation is relative to the start of the global offset
2359 table. */
2360
2361 /* Note that sgot->output_offset is not involved in this
2362 calculation. We always want the start of .got. If we
2363 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2364 permitted by the ABI, we might have to change this
2365 calculation. */
2366 relocation -= htab->sgot->output_section->vma;
2367 break;
2368
2369 case R_386_GOTPC:
2370 /* Use global offset table as symbol value. */
2371 relocation = htab->sgot->output_section->vma;
2372 unresolved_reloc = FALSE;
2373 break;
2374
2375 case R_386_PLT32:
2376 /* Relocation is to the entry for this symbol in the
2377 procedure linkage table. */
2378
2379 /* Resolve a PLT32 reloc against a local symbol directly,
2380 without using the procedure linkage table. */
2381 if (h == NULL)
2382 break;
2383
2384 if (h->plt.offset == (bfd_vma) -1
2385 || htab->splt == NULL)
2386 {
2387 /* We didn't make a PLT entry for this symbol. This
2388 happens when statically linking PIC code, or when
2389 using -Bsymbolic. */
2390 break;
2391 }
2392
2393 relocation = (htab->splt->output_section->vma
2394 + htab->splt->output_offset
2395 + h->plt.offset);
2396 unresolved_reloc = FALSE;
2397 break;
2398
2399 case R_386_32:
2400 case R_386_PC32:
2401 /* r_symndx will be zero only for relocs against symbols
2402 from removed linkonce sections, or sections discarded by
2403 a linker script. */
2404 if (r_symndx == 0
2405 || (input_section->flags & SEC_ALLOC) == 0)
2406 break;
2407
2408 if ((info->shared
2409 && (r_type != R_386_PC32
2410 || (h != NULL
2411 && h->dynindx != -1
2412 && (! info->symbolic
2413 || (h->elf_link_hash_flags
2414 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2415 || (!info->shared
2416 && h != NULL
2417 && h->dynindx != -1
2418 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2419 && (((h->elf_link_hash_flags
2420 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2421 && (h->elf_link_hash_flags
2422 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2423 || h->root.type == bfd_link_hash_undefweak
2424 || h->root.type == bfd_link_hash_undefined)))
2425 {
2426 Elf_Internal_Rela outrel;
2427 bfd_byte *loc;
2428 bfd_boolean skip, relocate;
2429 asection *sreloc;
2430
2431 /* When generating a shared object, these relocations
2432 are copied into the output file to be resolved at run
2433 time. */
2434
2435 skip = FALSE;
2436 relocate = FALSE;
2437
2438 outrel.r_offset =
2439 _bfd_elf_section_offset (output_bfd, info, input_section,
2440 rel->r_offset);
2441 if (outrel.r_offset == (bfd_vma) -1)
2442 skip = TRUE;
2443 else if (outrel.r_offset == (bfd_vma) -2)
2444 skip = TRUE, relocate = TRUE;
2445 outrel.r_offset += (input_section->output_section->vma
2446 + input_section->output_offset);
2447
2448 if (skip)
2449 memset (&outrel, 0, sizeof outrel);
2450 else if (h != NULL
2451 && h->dynindx != -1
2452 && (r_type == R_386_PC32
2453 || !info->shared
2454 || !info->symbolic
2455 || (h->elf_link_hash_flags
2456 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2457 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2458 else
2459 {
2460 /* This symbol is local, or marked to become local. */
2461 relocate = TRUE;
2462 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2463 }
2464
2465 sreloc = elf_section_data (input_section)->sreloc;
2466 if (sreloc == NULL)
2467 abort ();
2468
2469 loc = sreloc->contents;
2470 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2471 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2472
2473 /* If this reloc is against an external symbol, we do
2474 not want to fiddle with the addend. Otherwise, we
2475 need to include the symbol value so that it becomes
2476 an addend for the dynamic reloc. */
2477 if (! relocate)
2478 continue;
2479 }
2480 break;
2481
2482 case R_386_TLS_IE:
2483 if (info->shared)
2484 {
2485 Elf_Internal_Rela outrel;
2486 bfd_byte *loc;
2487 asection *sreloc;
2488
2489 outrel.r_offset = rel->r_offset
2490 + input_section->output_section->vma
2491 + input_section->output_offset;
2492 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2493 sreloc = elf_section_data (input_section)->sreloc;
2494 if (sreloc == NULL)
2495 abort ();
2496 loc = sreloc->contents;
2497 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2498 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2499 }
2500 /* Fall through */
2501
2502 case R_386_TLS_GD:
2503 case R_386_TLS_IE_32:
2504 case R_386_TLS_GOTIE:
2505 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2506 tls_type = GOT_UNKNOWN;
2507 if (h == NULL && local_got_offsets)
2508 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2509 else if (h != NULL)
2510 {
2511 tls_type = elf_i386_hash_entry(h)->tls_type;
2512 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2513 r_type = R_386_TLS_LE_32;
2514 }
2515 if (tls_type == GOT_TLS_IE)
2516 tls_type = GOT_TLS_IE_NEG;
2517 if (r_type == R_386_TLS_GD)
2518 {
2519 if (tls_type == GOT_TLS_IE_POS)
2520 r_type = R_386_TLS_GOTIE;
2521 else if (tls_type & GOT_TLS_IE)
2522 r_type = R_386_TLS_IE_32;
2523 }
2524
2525 if (r_type == R_386_TLS_LE_32)
2526 {
2527 BFD_ASSERT (! unresolved_reloc);
2528 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2529 {
2530 unsigned int val, type;
2531 bfd_vma roff;
2532
2533 /* GD->LE transition. */
2534 BFD_ASSERT (rel->r_offset >= 2);
2535 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2536 BFD_ASSERT (type == 0x8d || type == 0x04);
2537 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2538 BFD_ASSERT (bfd_get_8 (input_bfd,
2539 contents + rel->r_offset + 4)
2540 == 0xe8);
2541 BFD_ASSERT (rel + 1 < relend);
2542 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2543 roff = rel->r_offset + 5;
2544 val = bfd_get_8 (input_bfd,
2545 contents + rel->r_offset - 1);
2546 if (type == 0x04)
2547 {
2548 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2549 Change it into:
2550 movl %gs:0, %eax; subl $foo@tpoff, %eax
2551 (6 byte form of subl). */
2552 BFD_ASSERT (rel->r_offset >= 3);
2553 BFD_ASSERT (bfd_get_8 (input_bfd,
2554 contents + rel->r_offset - 3)
2555 == 0x8d);
2556 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2557 memcpy (contents + rel->r_offset - 3,
2558 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2559 }
2560 else
2561 {
2562 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2563 if (rel->r_offset + 10 <= input_section->_raw_size
2564 && bfd_get_8 (input_bfd,
2565 contents + rel->r_offset + 9) == 0x90)
2566 {
2567 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2568 Change it into:
2569 movl %gs:0, %eax; subl $foo@tpoff, %eax
2570 (6 byte form of subl). */
2571 memcpy (contents + rel->r_offset - 2,
2572 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2573 roff = rel->r_offset + 6;
2574 }
2575 else
2576 {
2577 /* leal foo(%reg), %eax; call ___tls_get_addr
2578 Change it into:
2579 movl %gs:0, %eax; subl $foo@tpoff, %eax
2580 (5 byte form of subl). */
2581 memcpy (contents + rel->r_offset - 2,
2582 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2583 }
2584 }
2585 bfd_put_32 (output_bfd, tpoff (info, relocation),
2586 contents + roff);
2587 /* Skip R_386_PLT32. */
2588 rel++;
2589 continue;
2590 }
2591 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2592 {
2593 unsigned int val, type;
2594
2595 /* IE->LE transition:
2596 Originally it can be one of:
2597 movl foo, %eax
2598 movl foo, %reg
2599 addl foo, %reg
2600 We change it into:
2601 movl $foo, %eax
2602 movl $foo, %reg
2603 addl $foo, %reg. */
2604 BFD_ASSERT (rel->r_offset >= 1);
2605 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2606 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2607 if (val == 0xa1)
2608 {
2609 /* movl foo, %eax. */
2610 bfd_put_8 (output_bfd, 0xb8, contents + rel->r_offset - 1);
2611 }
2612 else
2613 {
2614 BFD_ASSERT (rel->r_offset >= 2);
2615 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2616 switch (type)
2617 {
2618 case 0x8b:
2619 /* movl */
2620 BFD_ASSERT ((val & 0xc7) == 0x05);
2621 bfd_put_8 (output_bfd, 0xc7,
2622 contents + rel->r_offset - 2);
2623 bfd_put_8 (output_bfd,
2624 0xc0 | ((val >> 3) & 7),
2625 contents + rel->r_offset - 1);
2626 break;
2627 case 0x03:
2628 /* addl */
2629 BFD_ASSERT ((val & 0xc7) == 0x05);
2630 bfd_put_8 (output_bfd, 0x81,
2631 contents + rel->r_offset - 2);
2632 bfd_put_8 (output_bfd,
2633 0xc0 | ((val >> 3) & 7),
2634 contents + rel->r_offset - 1);
2635 break;
2636 default:
2637 BFD_FAIL ();
2638 break;
2639 }
2640 }
2641 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2642 contents + rel->r_offset);
2643 continue;
2644 }
2645 else
2646 {
2647 unsigned int val, type;
2648
2649 /* {IE_32,GOTIE}->LE transition:
2650 Originally it can be one of:
2651 subl foo(%reg1), %reg2
2652 movl foo(%reg1), %reg2
2653 addl foo(%reg1), %reg2
2654 We change it into:
2655 subl $foo, %reg2
2656 movl $foo, %reg2 (6 byte form)
2657 addl $foo, %reg2. */
2658 BFD_ASSERT (rel->r_offset >= 2);
2659 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2660 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2661 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2662 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2663 if (type == 0x8b)
2664 {
2665 /* movl */
2666 bfd_put_8 (output_bfd, 0xc7,
2667 contents + rel->r_offset - 2);
2668 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2669 contents + rel->r_offset - 1);
2670 }
2671 else if (type == 0x2b)
2672 {
2673 /* subl */
2674 bfd_put_8 (output_bfd, 0x81,
2675 contents + rel->r_offset - 2);
2676 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2677 contents + rel->r_offset - 1);
2678 }
2679 else if (type == 0x03)
2680 {
2681 /* addl */
2682 bfd_put_8 (output_bfd, 0x81,
2683 contents + rel->r_offset - 2);
2684 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2685 contents + rel->r_offset - 1);
2686 }
2687 else
2688 BFD_FAIL ();
2689 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2690 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2691 contents + rel->r_offset);
2692 else
2693 bfd_put_32 (output_bfd, tpoff (info, relocation),
2694 contents + rel->r_offset);
2695 continue;
2696 }
2697 }
2698
2699 if (htab->sgot == NULL)
2700 abort ();
2701
2702 if (h != NULL)
2703 off = h->got.offset;
2704 else
2705 {
2706 if (local_got_offsets == NULL)
2707 abort ();
2708
2709 off = local_got_offsets[r_symndx];
2710 }
2711
2712 if ((off & 1) != 0)
2713 off &= ~1;
2714 else
2715 {
2716 Elf_Internal_Rela outrel;
2717 bfd_byte *loc;
2718 int dr_type, indx;
2719
2720 if (htab->srelgot == NULL)
2721 abort ();
2722
2723 outrel.r_offset = (htab->sgot->output_section->vma
2724 + htab->sgot->output_offset + off);
2725
2726 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2727 if (r_type == R_386_TLS_GD)
2728 dr_type = R_386_TLS_DTPMOD32;
2729 else if (tls_type == GOT_TLS_IE_POS)
2730 dr_type = R_386_TLS_TPOFF;
2731 else
2732 dr_type = R_386_TLS_TPOFF32;
2733 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2734 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2735 htab->sgot->contents + off);
2736 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2737 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2738 htab->sgot->contents + off);
2739 else
2740 bfd_put_32 (output_bfd, 0,
2741 htab->sgot->contents + off);
2742 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2743 loc = htab->srelgot->contents;
2744 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2745 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2746
2747 if (r_type == R_386_TLS_GD)
2748 {
2749 if (indx == 0)
2750 {
2751 BFD_ASSERT (! unresolved_reloc);
2752 bfd_put_32 (output_bfd,
2753 relocation - dtpoff_base (info),
2754 htab->sgot->contents + off + 4);
2755 }
2756 else
2757 {
2758 bfd_put_32 (output_bfd, 0,
2759 htab->sgot->contents + off + 4);
2760 outrel.r_info = ELF32_R_INFO (indx,
2761 R_386_TLS_DTPOFF32);
2762 outrel.r_offset += 4;
2763 htab->srelgot->reloc_count++;
2764 loc += sizeof (Elf32_External_Rel);
2765 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2766 }
2767 }
2768 else if (tls_type == GOT_TLS_IE_BOTH)
2769 {
2770 bfd_put_32 (output_bfd,
2771 indx == 0 ? relocation - dtpoff_base (info) : 0,
2772 htab->sgot->contents + off + 4);
2773 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2774 outrel.r_offset += 4;
2775 htab->srelgot->reloc_count++;
2776 loc += sizeof (Elf32_External_Rel);
2777 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2778 }
2779
2780 if (h != NULL)
2781 h->got.offset |= 1;
2782 else
2783 local_got_offsets[r_symndx] |= 1;
2784 }
2785
2786 if (off >= (bfd_vma) -2)
2787 abort ();
2788 if (r_type == ELF32_R_TYPE (rel->r_info))
2789 {
2790 relocation = htab->sgot->output_offset + off;
2791 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2792 && tls_type == GOT_TLS_IE_BOTH)
2793 relocation += 4;
2794 if (r_type == R_386_TLS_IE)
2795 relocation += htab->sgot->output_section->vma;
2796 unresolved_reloc = FALSE;
2797 }
2798 else
2799 {
2800 unsigned int val, type;
2801 bfd_vma roff;
2802
2803 /* GD->IE transition. */
2804 BFD_ASSERT (rel->r_offset >= 2);
2805 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2806 BFD_ASSERT (type == 0x8d || type == 0x04);
2807 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2808 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2809 == 0xe8);
2810 BFD_ASSERT (rel + 1 < relend);
2811 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2812 roff = rel->r_offset - 3;
2813 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2814 if (type == 0x04)
2815 {
2816 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2817 Change it into:
2818 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2819 BFD_ASSERT (rel->r_offset >= 3);
2820 BFD_ASSERT (bfd_get_8 (input_bfd,
2821 contents + rel->r_offset - 3)
2822 == 0x8d);
2823 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2824 val >>= 3;
2825 }
2826 else
2827 {
2828 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2829 Change it into:
2830 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2831 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2832 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2833 BFD_ASSERT (bfd_get_8 (input_bfd,
2834 contents + rel->r_offset + 9)
2835 == 0x90);
2836 roff = rel->r_offset - 2;
2837 }
2838 memcpy (contents + roff,
2839 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2840 contents[roff + 7] = 0x80 | (val & 7);
2841 /* If foo is used only with foo@gotntpoff(%reg) and
2842 foo@indntpoff, but not with foo@gottpoff(%reg), change
2843 subl $foo@gottpoff(%reg), %eax
2844 into:
2845 addl $foo@gotntpoff(%reg), %eax. */
2846 if (r_type == R_386_TLS_GOTIE)
2847 {
2848 contents[roff + 6] = 0x03;
2849 if (tls_type == GOT_TLS_IE_BOTH)
2850 off += 4;
2851 }
2852 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2853 contents + roff + 8);
2854 /* Skip R_386_PLT32. */
2855 rel++;
2856 continue;
2857 }
2858 break;
2859
2860 case R_386_TLS_LDM:
2861 if (! info->shared)
2862 {
2863 unsigned int val;
2864
2865 /* LD->LE transition:
2866 Ensure it is:
2867 leal foo(%reg), %eax; call ___tls_get_addr.
2868 We change it into:
2869 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2870 BFD_ASSERT (rel->r_offset >= 2);
2871 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2872 == 0x8d);
2873 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2874 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2875 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2876 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2877 == 0xe8);
2878 BFD_ASSERT (rel + 1 < relend);
2879 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2880 memcpy (contents + rel->r_offset - 2,
2881 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2882 /* Skip R_386_PLT32. */
2883 rel++;
2884 continue;
2885 }
2886
2887 if (htab->sgot == NULL)
2888 abort ();
2889
2890 off = htab->tls_ldm_got.offset;
2891 if (off & 1)
2892 off &= ~1;
2893 else
2894 {
2895 Elf_Internal_Rela outrel;
2896 bfd_byte *loc;
2897
2898 if (htab->srelgot == NULL)
2899 abort ();
2900
2901 outrel.r_offset = (htab->sgot->output_section->vma
2902 + htab->sgot->output_offset + off);
2903
2904 bfd_put_32 (output_bfd, 0,
2905 htab->sgot->contents + off);
2906 bfd_put_32 (output_bfd, 0,
2907 htab->sgot->contents + off + 4);
2908 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2909 loc = htab->srelgot->contents;
2910 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2911 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2912 htab->tls_ldm_got.offset |= 1;
2913 }
2914 relocation = htab->sgot->output_offset + off;
2915 unresolved_reloc = FALSE;
2916 break;
2917
2918 case R_386_TLS_LDO_32:
2919 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2920 relocation -= dtpoff_base (info);
2921 else
2922 /* When converting LDO to LE, we must negate. */
2923 relocation = -tpoff (info, relocation);
2924 break;
2925
2926 case R_386_TLS_LE_32:
2927 case R_386_TLS_LE:
2928 if (info->shared)
2929 {
2930 Elf_Internal_Rela outrel;
2931 asection *sreloc;
2932 bfd_byte *loc;
2933 int indx;
2934
2935 outrel.r_offset = rel->r_offset
2936 + input_section->output_section->vma
2937 + input_section->output_offset;
2938 if (h != NULL && h->dynindx != -1)
2939 indx = h->dynindx;
2940 else
2941 indx = 0;
2942 if (r_type == R_386_TLS_LE_32)
2943 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2944 else
2945 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2946 sreloc = elf_section_data (input_section)->sreloc;
2947 if (sreloc == NULL)
2948 abort ();
2949 loc = sreloc->contents;
2950 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2951 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2952 if (indx)
2953 continue;
2954 else if (r_type == R_386_TLS_LE_32)
2955 relocation = dtpoff_base (info) - relocation;
2956 else
2957 relocation -= dtpoff_base (info);
2958 }
2959 else if (r_type == R_386_TLS_LE_32)
2960 relocation = tpoff (info, relocation);
2961 else
2962 relocation = -tpoff (info, relocation);
2963 break;
2964
2965 default:
2966 break;
2967 }
2968
2969 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2970 because such sections are not SEC_ALLOC and thus ld.so will
2971 not process them. */
2972 if (unresolved_reloc
2973 && !((input_section->flags & SEC_DEBUGGING) != 0
2974 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2975 {
2976 (*_bfd_error_handler)
2977 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2978 bfd_archive_filename (input_bfd),
2979 bfd_get_section_name (input_bfd, input_section),
2980 (long) rel->r_offset,
2981 h->root.root.string);
2982 return FALSE;
2983 }
2984
2985 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2986 contents, rel->r_offset,
2987 relocation, (bfd_vma) 0);
2988
2989 if (r != bfd_reloc_ok)
2990 {
2991 const char *name;
2992
2993 if (h != NULL)
2994 name = h->root.root.string;
2995 else
2996 {
2997 name = bfd_elf_string_from_elf_section (input_bfd,
2998 symtab_hdr->sh_link,
2999 sym->st_name);
3000 if (name == NULL)
3001 return FALSE;
3002 if (*name == '\0')
3003 name = bfd_section_name (input_bfd, sec);
3004 }
3005
3006 if (r == bfd_reloc_overflow)
3007 {
3008 if (! ((*info->callbacks->reloc_overflow)
3009 (info, name, howto->name, (bfd_vma) 0,
3010 input_bfd, input_section, rel->r_offset)))
3011 return FALSE;
3012 }
3013 else
3014 {
3015 (*_bfd_error_handler)
3016 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3017 bfd_archive_filename (input_bfd),
3018 bfd_get_section_name (input_bfd, input_section),
3019 (long) rel->r_offset, name, (int) r);
3020 return FALSE;
3021 }
3022 }
3023 }
3024
3025 return TRUE;
3026 }
3027
3028 /* Finish up dynamic symbol handling. We set the contents of various
3029 dynamic sections here. */
3030
3031 static bfd_boolean
3032 elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym)
3033 bfd *output_bfd;
3034 struct bfd_link_info *info;
3035 struct elf_link_hash_entry *h;
3036 Elf_Internal_Sym *sym;
3037 {
3038 struct elf_i386_link_hash_table *htab;
3039
3040 htab = elf_i386_hash_table (info);
3041
3042 if (h->plt.offset != (bfd_vma) -1)
3043 {
3044 bfd_vma plt_index;
3045 bfd_vma got_offset;
3046 Elf_Internal_Rela rel;
3047 bfd_byte *loc;
3048
3049 /* This symbol has an entry in the procedure linkage table. Set
3050 it up. */
3051
3052 if (h->dynindx == -1
3053 || htab->splt == NULL
3054 || htab->sgotplt == NULL
3055 || htab->srelplt == NULL)
3056 abort ();
3057
3058 /* Get the index in the procedure linkage table which
3059 corresponds to this symbol. This is the index of this symbol
3060 in all the symbols for which we are making plt entries. The
3061 first entry in the procedure linkage table is reserved. */
3062 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3063
3064 /* Get the offset into the .got table of the entry that
3065 corresponds to this function. Each .got entry is 4 bytes.
3066 The first three are reserved. */
3067 got_offset = (plt_index + 3) * 4;
3068
3069 /* Fill in the entry in the procedure linkage table. */
3070 if (! info->shared)
3071 {
3072 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3073 PLT_ENTRY_SIZE);
3074 bfd_put_32 (output_bfd,
3075 (htab->sgotplt->output_section->vma
3076 + htab->sgotplt->output_offset
3077 + got_offset),
3078 htab->splt->contents + h->plt.offset + 2);
3079 }
3080 else
3081 {
3082 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3083 PLT_ENTRY_SIZE);
3084 bfd_put_32 (output_bfd, got_offset,
3085 htab->splt->contents + h->plt.offset + 2);
3086 }
3087
3088 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3089 htab->splt->contents + h->plt.offset + 7);
3090 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3091 htab->splt->contents + h->plt.offset + 12);
3092
3093 /* Fill in the entry in the global offset table. */
3094 bfd_put_32 (output_bfd,
3095 (htab->splt->output_section->vma
3096 + htab->splt->output_offset
3097 + h->plt.offset
3098 + 6),
3099 htab->sgotplt->contents + got_offset);
3100
3101 /* Fill in the entry in the .rel.plt section. */
3102 rel.r_offset = (htab->sgotplt->output_section->vma
3103 + htab->sgotplt->output_offset
3104 + got_offset);
3105 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3106 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3107 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3108
3109 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3110 {
3111 /* Mark the symbol as undefined, rather than as defined in
3112 the .plt section. Leave the value alone. This is a clue
3113 for the dynamic linker, to make function pointer
3114 comparisons work between an application and shared
3115 library. */
3116 sym->st_shndx = SHN_UNDEF;
3117 }
3118 }
3119
3120 if (h->got.offset != (bfd_vma) -1
3121 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3122 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3123 {
3124 Elf_Internal_Rela rel;
3125 bfd_byte *loc;
3126
3127 /* This symbol has an entry in the global offset table. Set it
3128 up. */
3129
3130 if (htab->sgot == NULL || htab->srelgot == NULL)
3131 abort ();
3132
3133 rel.r_offset = (htab->sgot->output_section->vma
3134 + htab->sgot->output_offset
3135 + (h->got.offset & ~(bfd_vma) 1));
3136
3137 /* If this is a static link, or it is a -Bsymbolic link and the
3138 symbol is defined locally or was forced to be local because
3139 of a version file, we just want to emit a RELATIVE reloc.
3140 The entry in the global offset table will already have been
3141 initialized in the relocate_section function. */
3142 if (info->shared
3143 && (info->symbolic
3144 || h->dynindx == -1
3145 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
3146 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
3147 {
3148 BFD_ASSERT((h->got.offset & 1) != 0);
3149 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3150 }
3151 else
3152 {
3153 BFD_ASSERT((h->got.offset & 1) == 0);
3154 bfd_put_32 (output_bfd, (bfd_vma) 0,
3155 htab->sgot->contents + h->got.offset);
3156 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3157 }
3158
3159 loc = htab->srelgot->contents;
3160 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3161 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3162 }
3163
3164 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3165 {
3166 Elf_Internal_Rela rel;
3167 bfd_byte *loc;
3168
3169 /* This symbol needs a copy reloc. Set it up. */
3170
3171 if (h->dynindx == -1
3172 || (h->root.type != bfd_link_hash_defined
3173 && h->root.type != bfd_link_hash_defweak)
3174 || htab->srelbss == NULL)
3175 abort ();
3176
3177 rel.r_offset = (h->root.u.def.value
3178 + h->root.u.def.section->output_section->vma
3179 + h->root.u.def.section->output_offset);
3180 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3181 loc = htab->srelbss->contents;
3182 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3183 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3184 }
3185
3186 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3187 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3188 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3189 sym->st_shndx = SHN_ABS;
3190
3191 return TRUE;
3192 }
3193
3194 /* Used to decide how to sort relocs in an optimal manner for the
3195 dynamic linker, before writing them out. */
3196
3197 static enum elf_reloc_type_class
3198 elf_i386_reloc_type_class (rela)
3199 const Elf_Internal_Rela *rela;
3200 {
3201 switch ((int) ELF32_R_TYPE (rela->r_info))
3202 {
3203 case R_386_RELATIVE:
3204 return reloc_class_relative;
3205 case R_386_JUMP_SLOT:
3206 return reloc_class_plt;
3207 case R_386_COPY:
3208 return reloc_class_copy;
3209 default:
3210 return reloc_class_normal;
3211 }
3212 }
3213
3214 /* Finish up the dynamic sections. */
3215
3216 static bfd_boolean
3217 elf_i386_finish_dynamic_sections (output_bfd, info)
3218 bfd *output_bfd;
3219 struct bfd_link_info *info;
3220 {
3221 struct elf_i386_link_hash_table *htab;
3222 bfd *dynobj;
3223 asection *sdyn;
3224
3225 htab = elf_i386_hash_table (info);
3226 dynobj = htab->elf.dynobj;
3227 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3228
3229 if (htab->elf.dynamic_sections_created)
3230 {
3231 Elf32_External_Dyn *dyncon, *dynconend;
3232
3233 if (sdyn == NULL || htab->sgot == NULL)
3234 abort ();
3235
3236 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3237 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3238 for (; dyncon < dynconend; dyncon++)
3239 {
3240 Elf_Internal_Dyn dyn;
3241 asection *s;
3242
3243 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3244
3245 switch (dyn.d_tag)
3246 {
3247 default:
3248 continue;
3249
3250 case DT_PLTGOT:
3251 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3252 break;
3253
3254 case DT_JMPREL:
3255 s = htab->srelplt;
3256 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3257 break;
3258
3259 case DT_PLTRELSZ:
3260 s = htab->srelplt;
3261 dyn.d_un.d_val = s->_raw_size;
3262 break;
3263
3264 case DT_RELSZ:
3265 /* My reading of the SVR4 ABI indicates that the
3266 procedure linkage table relocs (DT_JMPREL) should be
3267 included in the overall relocs (DT_REL). This is
3268 what Solaris does. However, UnixWare can not handle
3269 that case. Therefore, we override the DT_RELSZ entry
3270 here to make it not include the JMPREL relocs. */
3271 s = htab->srelplt;
3272 if (s == NULL)
3273 continue;
3274 dyn.d_un.d_val -= s->_raw_size;
3275 break;
3276
3277 case DT_REL:
3278 /* We may not be using the standard ELF linker script.
3279 If .rel.plt is the first .rel section, we adjust
3280 DT_REL to not include it. */
3281 s = htab->srelplt;
3282 if (s == NULL)
3283 continue;
3284 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3285 continue;
3286 dyn.d_un.d_ptr += s->_raw_size;
3287 break;
3288 }
3289
3290 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3291 }
3292
3293 /* Fill in the first entry in the procedure linkage table. */
3294 if (htab->splt && htab->splt->_raw_size > 0)
3295 {
3296 if (info->shared)
3297 memcpy (htab->splt->contents,
3298 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3299 else
3300 {
3301 memcpy (htab->splt->contents,
3302 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3303 bfd_put_32 (output_bfd,
3304 (htab->sgotplt->output_section->vma
3305 + htab->sgotplt->output_offset
3306 + 4),
3307 htab->splt->contents + 2);
3308 bfd_put_32 (output_bfd,
3309 (htab->sgotplt->output_section->vma
3310 + htab->sgotplt->output_offset
3311 + 8),
3312 htab->splt->contents + 8);
3313 }
3314
3315 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3316 really seem like the right value. */
3317 elf_section_data (htab->splt->output_section)
3318 ->this_hdr.sh_entsize = 4;
3319 }
3320 }
3321
3322 if (htab->sgotplt)
3323 {
3324 /* Fill in the first three entries in the global offset table. */
3325 if (htab->sgotplt->_raw_size > 0)
3326 {
3327 bfd_put_32 (output_bfd,
3328 (sdyn == NULL ? (bfd_vma) 0
3329 : sdyn->output_section->vma + sdyn->output_offset),
3330 htab->sgotplt->contents);
3331 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3332 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3333 }
3334
3335 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3336 }
3337 return TRUE;
3338 }
3339
3340 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3341 #define TARGET_LITTLE_NAME "elf32-i386"
3342 #define ELF_ARCH bfd_arch_i386
3343 #define ELF_MACHINE_CODE EM_386
3344 #define ELF_MAXPAGESIZE 0x1000
3345
3346 #define elf_backend_can_gc_sections 1
3347 #define elf_backend_can_refcount 1
3348 #define elf_backend_want_got_plt 1
3349 #define elf_backend_plt_readonly 1
3350 #define elf_backend_want_plt_sym 0
3351 #define elf_backend_got_header_size 12
3352 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3353
3354 #define elf_info_to_howto elf_i386_info_to_howto
3355 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3356
3357 #define bfd_elf32_mkobject elf_i386_mkobject
3358 #define elf_backend_object_p elf_i386_object_p
3359
3360 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3361 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3362 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3363
3364 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3365 #define elf_backend_check_relocs elf_i386_check_relocs
3366 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3367 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3368 #define elf_backend_fake_sections elf_i386_fake_sections
3369 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3370 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3371 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3372 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3373 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3374 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3375 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3376 #define elf_backend_relocate_section elf_i386_relocate_section
3377 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3378
3379 #include "elf32-target.h"
3380
3381 /* FreeBSD support. */
3382
3383 #undef TARGET_LITTLE_SYM
3384 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3385 #undef TARGET_LITTLE_NAME
3386 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3387
3388 /* The kernel recognizes executables as valid only if they carry a
3389 "FreeBSD" label in the ELF header. So we put this label on all
3390 executables and (for simplicity) also all other object files. */
3391
3392 static void elf_i386_post_process_headers
3393 PARAMS ((bfd *, struct bfd_link_info *));
3394
3395 static void
3396 elf_i386_post_process_headers (abfd, link_info)
3397 bfd *abfd;
3398 struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3399 {
3400 Elf_Internal_Ehdr *i_ehdrp;
3401
3402 i_ehdrp = elf_elfheader (abfd);
3403
3404 /* Put an ABI label supported by FreeBSD >= 4.1. */
3405 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3406 #ifdef OLD_FREEBSD_ABI_LABEL
3407 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3408 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3409 #endif
3410 }
3411
3412 #undef elf_backend_post_process_headers
3413 #define elf_backend_post_process_headers elf_i386_post_process_headers
3414 #undef elf32_bed
3415 #define elf32_bed elf32_i386_fbsd_bed
3416
3417 #include "elf32-target.h"