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* configure.in (vax-*-openbsd*): Set COREFILE to netbsd-core.lo.
[binutils.git] / bfd / elf32-i386.c
blobcd3dc9acbe7e9e005c3353ae84d109f367095d3a
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_rel
30 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
31 static bfd_boolean elf_i386_is_local_label_name
32 PARAMS ((bfd *, const char *));
33 static bfd_boolean elf_i386_grok_prstatus
34 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
35 static bfd_boolean elf_i386_grok_psinfo
36 PARAMS ((bfd *abfd, Elf_Internal_Note *note));
37 static struct bfd_hash_entry *link_hash_newfunc
38 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
39 static struct bfd_link_hash_table *elf_i386_link_hash_table_create
40 PARAMS ((bfd *));
41 static bfd_boolean create_got_section
42 PARAMS ((bfd *, struct bfd_link_info *));
43 static bfd_boolean elf_i386_create_dynamic_sections
44 PARAMS ((bfd *, struct bfd_link_info *));
45 static void elf_i386_copy_indirect_symbol
46 PARAMS ((struct elf_backend_data *, struct elf_link_hash_entry *,
47 struct elf_link_hash_entry *));
48 static int elf_i386_tls_transition
49 PARAMS ((struct bfd_link_info *, int, int));
50
51 static bfd_boolean elf_i386_mkobject
52 PARAMS ((bfd *));
53 static bfd_boolean elf_i386_object_p
54 PARAMS ((bfd *));
55 static bfd_boolean elf_i386_check_relocs
56 PARAMS ((bfd *, struct bfd_link_info *, asection *,
57 const Elf_Internal_Rela *));
58 static asection *elf_i386_gc_mark_hook
59 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
60 struct elf_link_hash_entry *, Elf_Internal_Sym *));
61 static bfd_boolean elf_i386_gc_sweep_hook
62 PARAMS ((bfd *, struct bfd_link_info *, asection *,
63 const Elf_Internal_Rela *));
64 static bfd_boolean elf_i386_adjust_dynamic_symbol
65 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
66 static bfd_boolean allocate_dynrelocs
67 PARAMS ((struct elf_link_hash_entry *, PTR));
68 static bfd_boolean readonly_dynrelocs
69 PARAMS ((struct elf_link_hash_entry *, PTR));
70 static bfd_boolean elf_i386_fake_sections
71 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
72 static bfd_boolean elf_i386_size_dynamic_sections
73 PARAMS ((bfd *, struct bfd_link_info *));
74 static bfd_vma dtpoff_base
75 PARAMS ((struct bfd_link_info *));
76 static bfd_vma tpoff
77 PARAMS ((struct bfd_link_info *, bfd_vma));
78 static bfd_boolean elf_i386_relocate_section
79 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
80 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
81 static bfd_boolean elf_i386_finish_dynamic_symbol
82 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
83 Elf_Internal_Sym *));
84 static enum elf_reloc_type_class elf_i386_reloc_type_class
85 PARAMS ((const Elf_Internal_Rela *));
86 static bfd_boolean elf_i386_finish_dynamic_sections
87 PARAMS ((bfd *, struct bfd_link_info *));
88
89 #define USE_REL 1 /* 386 uses REL relocations instead of RELA. */
90
91 #include "elf/i386.h"
92
93 static reloc_howto_type elf_howto_table[]=
94 {
95 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_NONE",
97 TRUE, 0x00000000, 0x00000000, FALSE),
98 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_32",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_PC32",
103 TRUE, 0xffffffff, 0xffffffff, TRUE),
104 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_GOT32",
106 TRUE, 0xffffffff, 0xffffffff, FALSE),
107 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_PLT32",
109 TRUE, 0xffffffff, 0xffffffff, TRUE),
110 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_COPY",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_RELATIVE",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_GOTOFF",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_GOTPC",
127 TRUE, 0xffffffff, 0xffffffff, TRUE),
128
129 /* We have a gap in the reloc numbers here.
130 R_386_standard counts the number up to this point, and
131 R_386_ext_offset is the value to subtract from a reloc type of
132 R_386_16 thru R_386_PC8 to form an index into this table. */
133 #define R_386_standard ((unsigned int) R_386_GOTPC + 1)
134 #define R_386_ext_offset ((unsigned int) R_386_TLS_TPOFF - R_386_standard)
135
136 /* These relocs are a GNU extension. */
137 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_TLS_IE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_TLS_LE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_386_TLS_GD",
151 TRUE, 0xffffffff, 0xffffffff, FALSE),
152 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_386_TLS_LDM",
154 TRUE, 0xffffffff, 0xffffffff, FALSE),
155 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_386_16",
157 TRUE, 0xffff, 0xffff, FALSE),
158 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_386_PC16",
160 TRUE, 0xffff, 0xffff, TRUE),
161 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_386_8",
163 TRUE, 0xff, 0xff, FALSE),
164 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
165 bfd_elf_generic_reloc, "R_386_PC8",
166 TRUE, 0xff, 0xff, TRUE),
167
168 #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset)
169 #define R_386_tls_offset ((unsigned int) R_386_TLS_LDO_32 - R_386_ext)
170 /* These are common with Solaris TLS implementation. */
171 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
173 TRUE, 0xffffffff, 0xffffffff, FALSE),
174 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
176 TRUE, 0xffffffff, 0xffffffff, FALSE),
177 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
179 TRUE, 0xffffffff, 0xffffffff, FALSE),
180 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
182 TRUE, 0xffffffff, 0xffffffff, FALSE),
183 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
184 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
185 TRUE, 0xffffffff, 0xffffffff, FALSE),
186 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
188 TRUE, 0xffffffff, 0xffffffff, FALSE),
189
190 /* Another gap. */
191 #define R_386_tls ((unsigned int) R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
192 #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_tls)
193
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_386_GNU_VTINHERIT, /* type */
196 0, /* rightshift */
197 2, /* size (0 = byte, 1 = short, 2 = long) */
198 0, /* bitsize */
199 FALSE, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_dont, /* complain_on_overflow */
202 NULL, /* special_function */
203 "R_386_GNU_VTINHERIT", /* name */
204 FALSE, /* partial_inplace */
205 0, /* src_mask */
206 0, /* dst_mask */
207 FALSE), /* pcrel_offset */
208
209 /* GNU extension to record C++ vtable member usage. */
210 HOWTO (R_386_GNU_VTENTRY, /* type */
211 0, /* rightshift */
212 2, /* size (0 = byte, 1 = short, 2 = long) */
213 0, /* bitsize */
214 FALSE, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_dont, /* complain_on_overflow */
217 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
218 "R_386_GNU_VTENTRY", /* name */
219 FALSE, /* partial_inplace */
220 0, /* src_mask */
221 0, /* dst_mask */
222 FALSE) /* pcrel_offset */
223
224 #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
225
226 };
227
228 #ifdef DEBUG_GEN_RELOC
229 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
230 #else
231 #define TRACE(str)
232 #endif
233
234 static reloc_howto_type *
235 elf_i386_reloc_type_lookup (abfd, code)
236 bfd *abfd ATTRIBUTE_UNUSED;
237 bfd_reloc_code_real_type code;
238 {
239 switch (code)
240 {
241 case BFD_RELOC_NONE:
242 TRACE ("BFD_RELOC_NONE");
243 return &elf_howto_table[(unsigned int) R_386_NONE ];
244
245 case BFD_RELOC_32:
246 TRACE ("BFD_RELOC_32");
247 return &elf_howto_table[(unsigned int) R_386_32 ];
248
249 case BFD_RELOC_CTOR:
250 TRACE ("BFD_RELOC_CTOR");
251 return &elf_howto_table[(unsigned int) R_386_32 ];
252
253 case BFD_RELOC_32_PCREL:
254 TRACE ("BFD_RELOC_PC32");
255 return &elf_howto_table[(unsigned int) R_386_PC32 ];
256
257 case BFD_RELOC_386_GOT32:
258 TRACE ("BFD_RELOC_386_GOT32");
259 return &elf_howto_table[(unsigned int) R_386_GOT32 ];
260
261 case BFD_RELOC_386_PLT32:
262 TRACE ("BFD_RELOC_386_PLT32");
263 return &elf_howto_table[(unsigned int) R_386_PLT32 ];
264
265 case BFD_RELOC_386_COPY:
266 TRACE ("BFD_RELOC_386_COPY");
267 return &elf_howto_table[(unsigned int) R_386_COPY ];
268
269 case BFD_RELOC_386_GLOB_DAT:
270 TRACE ("BFD_RELOC_386_GLOB_DAT");
271 return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ];
272
273 case BFD_RELOC_386_JUMP_SLOT:
274 TRACE ("BFD_RELOC_386_JUMP_SLOT");
275 return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ];
276
277 case BFD_RELOC_386_RELATIVE:
278 TRACE ("BFD_RELOC_386_RELATIVE");
279 return &elf_howto_table[(unsigned int) R_386_RELATIVE ];
280
281 case BFD_RELOC_386_GOTOFF:
282 TRACE ("BFD_RELOC_386_GOTOFF");
283 return &elf_howto_table[(unsigned int) R_386_GOTOFF ];
284
285 case BFD_RELOC_386_GOTPC:
286 TRACE ("BFD_RELOC_386_GOTPC");
287 return &elf_howto_table[(unsigned int) R_386_GOTPC ];
288
289 /* These relocs are a GNU extension. */
290 case BFD_RELOC_386_TLS_TPOFF:
291 TRACE ("BFD_RELOC_386_TLS_TPOFF");
292 return &elf_howto_table[(unsigned int) R_386_TLS_TPOFF - R_386_ext_offset];
293
294 case BFD_RELOC_386_TLS_IE:
295 TRACE ("BFD_RELOC_386_TLS_IE");
296 return &elf_howto_table[(unsigned int) R_386_TLS_IE - R_386_ext_offset];
297
298 case BFD_RELOC_386_TLS_GOTIE:
299 TRACE ("BFD_RELOC_386_TLS_GOTIE");
300 return &elf_howto_table[(unsigned int) R_386_TLS_GOTIE - R_386_ext_offset];
301
302 case BFD_RELOC_386_TLS_LE:
303 TRACE ("BFD_RELOC_386_TLS_LE");
304 return &elf_howto_table[(unsigned int) R_386_TLS_LE - R_386_ext_offset];
305
306 case BFD_RELOC_386_TLS_GD:
307 TRACE ("BFD_RELOC_386_TLS_GD");
308 return &elf_howto_table[(unsigned int) R_386_TLS_GD - R_386_ext_offset];
309
310 case BFD_RELOC_386_TLS_LDM:
311 TRACE ("BFD_RELOC_386_TLS_LDM");
312 return &elf_howto_table[(unsigned int) R_386_TLS_LDM - R_386_ext_offset];
313
314 case BFD_RELOC_16:
315 TRACE ("BFD_RELOC_16");
316 return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset];
317
318 case BFD_RELOC_16_PCREL:
319 TRACE ("BFD_RELOC_16_PCREL");
320 return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset];
321
322 case BFD_RELOC_8:
323 TRACE ("BFD_RELOC_8");
324 return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset];
325
326 case BFD_RELOC_8_PCREL:
327 TRACE ("BFD_RELOC_8_PCREL");
328 return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset];
329
330 /* Common with Sun TLS implementation. */
331 case BFD_RELOC_386_TLS_LDO_32:
332 TRACE ("BFD_RELOC_386_TLS_LDO_32");
333 return &elf_howto_table[(unsigned int) R_386_TLS_LDO_32 - R_386_tls_offset];
334
335 case BFD_RELOC_386_TLS_IE_32:
336 TRACE ("BFD_RELOC_386_TLS_IE_32");
337 return &elf_howto_table[(unsigned int) R_386_TLS_IE_32 - R_386_tls_offset];
338
339 case BFD_RELOC_386_TLS_LE_32:
340 TRACE ("BFD_RELOC_386_TLS_LE_32");
341 return &elf_howto_table[(unsigned int) R_386_TLS_LE_32 - R_386_tls_offset];
342
343 case BFD_RELOC_386_TLS_DTPMOD32:
344 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
345 return &elf_howto_table[(unsigned int) R_386_TLS_DTPMOD32 - R_386_tls_offset];
346
347 case BFD_RELOC_386_TLS_DTPOFF32:
348 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
349 return &elf_howto_table[(unsigned int) R_386_TLS_DTPOFF32 - R_386_tls_offset];
350
351 case BFD_RELOC_386_TLS_TPOFF32:
352 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
353 return &elf_howto_table[(unsigned int) R_386_TLS_TPOFF32 - R_386_tls_offset];
354
355 case BFD_RELOC_VTABLE_INHERIT:
356 TRACE ("BFD_RELOC_VTABLE_INHERIT");
357 return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT
358 - R_386_vt_offset];
359
360 case BFD_RELOC_VTABLE_ENTRY:
361 TRACE ("BFD_RELOC_VTABLE_ENTRY");
362 return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY
363 - R_386_vt_offset];
364
365 default:
366 break;
367 }
368
369 TRACE ("Unknown");
370 return 0;
371 }
372
373 static void
374 elf_i386_info_to_howto_rel (abfd, cache_ptr, dst)
375 bfd *abfd ATTRIBUTE_UNUSED;
376 arelent *cache_ptr;
377 Elf_Internal_Rela *dst;
378 {
379 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
380 unsigned int indx;
381
382 if ((indx = r_type) >= R_386_standard
383 && ((indx = r_type - R_386_ext_offset) - R_386_standard
384 >= R_386_ext - R_386_standard)
385 && ((indx = r_type - R_386_tls_offset) - R_386_ext
386 >= R_386_tls - R_386_ext)
387 && ((indx = r_type - R_386_vt_offset) - R_386_tls
388 >= R_386_vt - R_386_tls))
389 {
390 (*_bfd_error_handler) (_("%s: invalid relocation type %d"),
391 bfd_archive_filename (abfd), (int) r_type);
392 indx = (unsigned int) R_386_NONE;
393 }
394 cache_ptr->howto = &elf_howto_table[indx];
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (abfd, name)
405 bfd *abfd;
406 const char *name;
407 {
408 if (name[0] == '.' && name[1] == 'X')
409 return TRUE;
410
411 return _bfd_elf_is_local_label_name (abfd, name);
412 }
413 \f
414 /* Support for core dump NOTE sections. */
415 static bfd_boolean
416 elf_i386_grok_prstatus (abfd, note)
417 bfd *abfd;
418 Elf_Internal_Note *note;
419 {
420 int offset;
421 size_t raw_size;
422
423 switch (note->descsz)
424 {
425 default:
426 return FALSE;
427
428 case 144: /* Linux/i386 */
429 /* pr_cursig */
430 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
431
432 /* pr_pid */
433 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
434
435 /* pr_reg */
436 offset = 72;
437 raw_size = 68;
438
439 break;
440 }
441
442 /* Make a ".reg/999" section. */
443 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
444 raw_size, note->descpos + offset);
445 }
446
447 static bfd_boolean
448 elf_i386_grok_psinfo (abfd, note)
449 bfd *abfd;
450 Elf_Internal_Note *note;
451 {
452 switch (note->descsz)
453 {
454 default:
455 return FALSE;
456
457 case 124: /* Linux/i386 elf_prpsinfo */
458 elf_tdata (abfd)->core_program
459 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
460 elf_tdata (abfd)->core_command
461 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
462 }
463
464 /* Note that for some reason, a spurious space is tacked
465 onto the end of the args in some (at least one anyway)
466 implementations, so strip it off if it exists. */
467
468 {
469 char *command = elf_tdata (abfd)->core_command;
470 int n = strlen (command);
471
472 if (0 < n && command[n - 1] == ' ')
473 command[n - 1] = '\0';
474 }
475
476 return TRUE;
477 }
478 \f
479 /* Functions for the i386 ELF linker.
480
481 In order to gain some understanding of code in this file without
482 knowing all the intricate details of the linker, note the
483 following:
484
485 Functions named elf_i386_* are called by external routines, other
486 functions are only called locally. elf_i386_* functions appear
487 in this file more or less in the order in which they are called
488 from external routines. eg. elf_i386_check_relocs is called
489 early in the link process, elf_i386_finish_dynamic_sections is
490 one of the last functions. */
491
492
493 /* The name of the dynamic interpreter. This is put in the .interp
494 section. */
495
496 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
497
498 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
499 copying dynamic variables from a shared lib into an app's dynbss
500 section, and instead use a dynamic relocation to point into the
501 shared lib. */
502 #define ELIMINATE_COPY_RELOCS 1
503
504 /* The size in bytes of an entry in the procedure linkage table. */
505
506 #define PLT_ENTRY_SIZE 16
507
508 /* The first entry in an absolute procedure linkage table looks like
509 this. See the SVR4 ABI i386 supplement to see how this works. */
510
511 static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
512 {
513 0xff, 0x35, /* pushl contents of address */
514 0, 0, 0, 0, /* replaced with address of .got + 4. */
515 0xff, 0x25, /* jmp indirect */
516 0, 0, 0, 0, /* replaced with address of .got + 8. */
517 0, 0, 0, 0 /* pad out to 16 bytes. */
518 };
519
520 /* Subsequent entries in an absolute procedure linkage table look like
521 this. */
522
523 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
524 {
525 0xff, 0x25, /* jmp indirect */
526 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
527 0x68, /* pushl immediate */
528 0, 0, 0, 0, /* replaced with offset into relocation table. */
529 0xe9, /* jmp relative */
530 0, 0, 0, 0 /* replaced with offset to start of .plt. */
531 };
532
533 /* The first entry in a PIC procedure linkage table look like this. */
534
535 static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
536 {
537 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
538 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
539 0, 0, 0, 0 /* pad out to 16 bytes. */
540 };
541
542 /* Subsequent entries in a PIC procedure linkage table look like this. */
543
544 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
545 {
546 0xff, 0xa3, /* jmp *offset(%ebx) */
547 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
548 0x68, /* pushl immediate */
549 0, 0, 0, 0, /* replaced with offset into relocation table. */
550 0xe9, /* jmp relative */
551 0, 0, 0, 0 /* replaced with offset to start of .plt. */
552 };
553
554 /* The i386 linker needs to keep track of the number of relocs that it
555 decides to copy as dynamic relocs in check_relocs for each symbol.
556 This is so that it can later discard them if they are found to be
557 unnecessary. We store the information in a field extending the
558 regular ELF linker hash table. */
559
560 struct elf_i386_dyn_relocs
561 {
562 struct elf_i386_dyn_relocs *next;
563
564 /* The input section of the reloc. */
565 asection *sec;
566
567 /* Total number of relocs copied for the input section. */
568 bfd_size_type count;
569
570 /* Number of pc-relative relocs copied for the input section. */
571 bfd_size_type pc_count;
572 };
573
574 /* i386 ELF linker hash entry. */
575
576 struct elf_i386_link_hash_entry
577 {
578 struct elf_link_hash_entry elf;
579
580 /* Track dynamic relocs copied for this symbol. */
581 struct elf_i386_dyn_relocs *dyn_relocs;
582
583 #define GOT_UNKNOWN 0
584 #define GOT_NORMAL 1
585 #define GOT_TLS_GD 2
586 #define GOT_TLS_IE 4
587 #define GOT_TLS_IE_POS 5
588 #define GOT_TLS_IE_NEG 6
589 #define GOT_TLS_IE_BOTH 7
590 unsigned char tls_type;
591 };
592
593 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
594
595 struct elf_i386_obj_tdata
596 {
597 struct elf_obj_tdata root;
598
599 /* tls_type for each local got entry. */
600 char *local_got_tls_type;
601 };
602
603 #define elf_i386_tdata(abfd) \
604 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
605
606 #define elf_i386_local_got_tls_type(abfd) \
607 (elf_i386_tdata (abfd)->local_got_tls_type)
608
609 static bfd_boolean
610 elf_i386_mkobject (abfd)
611 bfd *abfd;
612 {
613 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
614 abfd->tdata.any = bfd_zalloc (abfd, amt);
615 if (abfd->tdata.any == NULL)
616 return FALSE;
617 return TRUE;
618 }
619
620 static bfd_boolean
621 elf_i386_object_p (abfd)
622 bfd *abfd;
623 {
624 /* Allocate our special target data. */
625 struct elf_i386_obj_tdata *new_tdata;
626 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
627 new_tdata = bfd_zalloc (abfd, amt);
628 if (new_tdata == NULL)
629 return FALSE;
630 new_tdata->root = *abfd->tdata.elf_obj_data;
631 abfd->tdata.any = new_tdata;
632 return TRUE;
633 }
634
635 /* i386 ELF linker hash table. */
636
637 struct elf_i386_link_hash_table
638 {
639 struct elf_link_hash_table elf;
640
641 /* Short-cuts to get to dynamic linker sections. */
642 asection *sgot;
643 asection *sgotplt;
644 asection *srelgot;
645 asection *splt;
646 asection *srelplt;
647 asection *sdynbss;
648 asection *srelbss;
649
650 union {
651 bfd_signed_vma refcount;
652 bfd_vma offset;
653 } tls_ldm_got;
654
655 /* Small local sym to section mapping cache. */
656 struct sym_sec_cache sym_sec;
657 };
658
659 /* Get the i386 ELF linker hash table from a link_info structure. */
660
661 #define elf_i386_hash_table(p) \
662 ((struct elf_i386_link_hash_table *) ((p)->hash))
663
664 /* Create an entry in an i386 ELF linker hash table. */
665
666 static struct bfd_hash_entry *
667 link_hash_newfunc (entry, table, string)
668 struct bfd_hash_entry *entry;
669 struct bfd_hash_table *table;
670 const char *string;
671 {
672 /* Allocate the structure if it has not already been allocated by a
673 subclass. */
674 if (entry == NULL)
675 {
676 entry = bfd_hash_allocate (table,
677 sizeof (struct elf_i386_link_hash_entry));
678 if (entry == NULL)
679 return entry;
680 }
681
682 /* Call the allocation method of the superclass. */
683 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
684 if (entry != NULL)
685 {
686 struct elf_i386_link_hash_entry *eh;
687
688 eh = (struct elf_i386_link_hash_entry *) entry;
689 eh->dyn_relocs = NULL;
690 eh->tls_type = GOT_UNKNOWN;
691 }
692
693 return entry;
694 }
695
696 /* Create an i386 ELF linker hash table. */
697
698 static struct bfd_link_hash_table *
699 elf_i386_link_hash_table_create (abfd)
700 bfd *abfd;
701 {
702 struct elf_i386_link_hash_table *ret;
703 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
704
705 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
706 if (ret == NULL)
707 return NULL;
708
709 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
710 {
711 free (ret);
712 return NULL;
713 }
714
715 ret->sgot = NULL;
716 ret->sgotplt = NULL;
717 ret->srelgot = NULL;
718 ret->splt = NULL;
719 ret->srelplt = NULL;
720 ret->sdynbss = NULL;
721 ret->srelbss = NULL;
722 ret->tls_ldm_got.refcount = 0;
723 ret->sym_sec.abfd = NULL;
724
725 return &ret->elf.root;
726 }
727
728 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
729 shortcuts to them in our hash table. */
730
731 static bfd_boolean
732 create_got_section (dynobj, info)
733 bfd *dynobj;
734 struct bfd_link_info *info;
735 {
736 struct elf_i386_link_hash_table *htab;
737
738 if (! _bfd_elf_create_got_section (dynobj, info))
739 return FALSE;
740
741 htab = elf_i386_hash_table (info);
742 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
743 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
744 if (!htab->sgot || !htab->sgotplt)
745 abort ();
746
747 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
748 if (htab->srelgot == NULL
749 || ! bfd_set_section_flags (dynobj, htab->srelgot,
750 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
751 | SEC_IN_MEMORY | SEC_LINKER_CREATED
752 | SEC_READONLY))
753 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
754 return FALSE;
755 return TRUE;
756 }
757
758 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
759 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
760 hash table. */
761
762 static bfd_boolean
763 elf_i386_create_dynamic_sections (dynobj, info)
764 bfd *dynobj;
765 struct bfd_link_info *info;
766 {
767 struct elf_i386_link_hash_table *htab;
768
769 htab = elf_i386_hash_table (info);
770 if (!htab->sgot && !create_got_section (dynobj, info))
771 return FALSE;
772
773 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
774 return FALSE;
775
776 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
777 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
778 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
779 if (!info->shared)
780 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
781
782 if (!htab->splt || !htab->srelplt || !htab->sdynbss
783 || (!info->shared && !htab->srelbss))
784 abort ();
785
786 return TRUE;
787 }
788
789 /* Copy the extra info we tack onto an elf_link_hash_entry. */
790
791 static void
792 elf_i386_copy_indirect_symbol (bed, dir, ind)
793 struct elf_backend_data *bed;
794 struct elf_link_hash_entry *dir, *ind;
795 {
796 struct elf_i386_link_hash_entry *edir, *eind;
797
798 edir = (struct elf_i386_link_hash_entry *) dir;
799 eind = (struct elf_i386_link_hash_entry *) ind;
800
801 if (eind->dyn_relocs != NULL)
802 {
803 if (edir->dyn_relocs != NULL)
804 {
805 struct elf_i386_dyn_relocs **pp;
806 struct elf_i386_dyn_relocs *p;
807
808 if (ind->root.type == bfd_link_hash_indirect)
809 abort ();
810
811 /* Add reloc counts against the weak sym to the strong sym
812 list. Merge any entries against the same section. */
813 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
814 {
815 struct elf_i386_dyn_relocs *q;
816
817 for (q = edir->dyn_relocs; q != NULL; q = q->next)
818 if (q->sec == p->sec)
819 {
820 q->pc_count += p->pc_count;
821 q->count += p->count;
822 *pp = p->next;
823 break;
824 }
825 if (q == NULL)
826 pp = &p->next;
827 }
828 *pp = edir->dyn_relocs;
829 }
830
831 edir->dyn_relocs = eind->dyn_relocs;
832 eind->dyn_relocs = NULL;
833 }
834
835 if (ind->root.type == bfd_link_hash_indirect
836 && dir->got.refcount <= 0)
837 {
838 edir->tls_type = eind->tls_type;
839 eind->tls_type = GOT_UNKNOWN;
840 }
841
842 if (ELIMINATE_COPY_RELOCS
843 && ind->root.type != bfd_link_hash_indirect
844 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
845 /* If called to transfer flags for a weakdef during processing
846 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
847 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
848 dir->elf_link_hash_flags |=
849 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
850 | ELF_LINK_HASH_REF_REGULAR
851 | ELF_LINK_HASH_REF_REGULAR_NONWEAK));
852 else
853 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
854 }
855
856 static int
857 elf_i386_tls_transition (info, r_type, is_local)
858 struct bfd_link_info *info;
859 int r_type;
860 int is_local;
861 {
862 if (info->shared)
863 return r_type;
864
865 switch (r_type)
866 {
867 case R_386_TLS_GD:
868 case R_386_TLS_IE_32:
869 if (is_local)
870 return R_386_TLS_LE_32;
871 return R_386_TLS_IE_32;
872 case R_386_TLS_IE:
873 case R_386_TLS_GOTIE:
874 if (is_local)
875 return R_386_TLS_LE_32;
876 return r_type;
877 case R_386_TLS_LDM:
878 return R_386_TLS_LE_32;
879 }
880
881 return r_type;
882 }
883
884 /* Look through the relocs for a section during the first phase, and
885 calculate needed space in the global offset table, procedure linkage
886 table, and dynamic reloc sections. */
887
888 static bfd_boolean
889 elf_i386_check_relocs (abfd, info, sec, relocs)
890 bfd *abfd;
891 struct bfd_link_info *info;
892 asection *sec;
893 const Elf_Internal_Rela *relocs;
894 {
895 struct elf_i386_link_hash_table *htab;
896 Elf_Internal_Shdr *symtab_hdr;
897 struct elf_link_hash_entry **sym_hashes;
898 const Elf_Internal_Rela *rel;
899 const Elf_Internal_Rela *rel_end;
900 asection *sreloc;
901
902 if (info->relocateable)
903 return TRUE;
904
905 htab = elf_i386_hash_table (info);
906 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
907 sym_hashes = elf_sym_hashes (abfd);
908
909 sreloc = NULL;
910
911 rel_end = relocs + sec->reloc_count;
912 for (rel = relocs; rel < rel_end; rel++)
913 {
914 unsigned int r_type;
915 unsigned long r_symndx;
916 struct elf_link_hash_entry *h;
917
918 r_symndx = ELF32_R_SYM (rel->r_info);
919 r_type = ELF32_R_TYPE (rel->r_info);
920
921 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
922 {
923 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
924 bfd_archive_filename (abfd),
925 r_symndx);
926 return FALSE;
927 }
928
929 if (r_symndx < symtab_hdr->sh_info)
930 h = NULL;
931 else
932 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
933
934 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
935
936 switch (r_type)
937 {
938 case R_386_TLS_LDM:
939 htab->tls_ldm_got.refcount += 1;
940 goto create_got;
941
942 case R_386_PLT32:
943 /* This symbol requires a procedure linkage table entry. We
944 actually build the entry in adjust_dynamic_symbol,
945 because this might be a case of linking PIC code which is
946 never referenced by a dynamic object, in which case we
947 don't need to generate a procedure linkage table entry
948 after all. */
949
950 /* If this is a local symbol, we resolve it directly without
951 creating a procedure linkage table entry. */
952 if (h == NULL)
953 continue;
954
955 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
956 h->plt.refcount += 1;
957 break;
958
959 case R_386_TLS_IE_32:
960 case R_386_TLS_IE:
961 case R_386_TLS_GOTIE:
962 if (info->shared)
963 info->flags |= DF_STATIC_TLS;
964 /* Fall through */
965
966 case R_386_GOT32:
967 case R_386_TLS_GD:
968 /* This symbol requires a global offset table entry. */
969 {
970 int tls_type, old_tls_type;
971
972 switch (r_type)
973 {
974 default:
975 case R_386_GOT32: tls_type = GOT_NORMAL; break;
976 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
977 case R_386_TLS_IE_32:
978 if (ELF32_R_TYPE (rel->r_info) == r_type)
979 tls_type = GOT_TLS_IE_NEG;
980 else
981 /* If this is a GD->IE transition, we may use either of
982 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
983 tls_type = GOT_TLS_IE;
984 break;
985 case R_386_TLS_IE:
986 case R_386_TLS_GOTIE:
987 tls_type = GOT_TLS_IE_POS; break;
988 }
989
990 if (h != NULL)
991 {
992 h->got.refcount += 1;
993 old_tls_type = elf_i386_hash_entry(h)->tls_type;
994 }
995 else
996 {
997 bfd_signed_vma *local_got_refcounts;
998
999 /* This is a global offset table entry for a local symbol. */
1000 local_got_refcounts = elf_local_got_refcounts (abfd);
1001 if (local_got_refcounts == NULL)
1002 {
1003 bfd_size_type size;
1004
1005 size = symtab_hdr->sh_info;
1006 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1007 local_got_refcounts = ((bfd_signed_vma *)
1008 bfd_zalloc (abfd, size));
1009 if (local_got_refcounts == NULL)
1010 return FALSE;
1011 elf_local_got_refcounts (abfd) = local_got_refcounts;
1012 elf_i386_local_got_tls_type (abfd)
1013 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1014 }
1015 local_got_refcounts[r_symndx] += 1;
1016 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1017 }
1018
1019 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1020 tls_type |= old_tls_type;
1021 /* If a TLS symbol is accessed using IE at least once,
1022 there is no point to use dynamic model for it. */
1023 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1024 && (old_tls_type != GOT_TLS_GD
1025 || (tls_type & GOT_TLS_IE) == 0))
1026 {
1027 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1028 tls_type = old_tls_type;
1029 else
1030 {
1031 (*_bfd_error_handler)
1032 (_("%s: `%s' accessed both as normal and thread local symbol"),
1033 bfd_archive_filename (abfd),
1034 h ? h->root.root.string : "<local>");
1035 return FALSE;
1036 }
1037 }
1038
1039 if (old_tls_type != tls_type)
1040 {
1041 if (h != NULL)
1042 elf_i386_hash_entry (h)->tls_type = tls_type;
1043 else
1044 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1045 }
1046 }
1047 /* Fall through */
1048
1049 case R_386_GOTOFF:
1050 case R_386_GOTPC:
1051 create_got:
1052 if (htab->sgot == NULL)
1053 {
1054 if (htab->elf.dynobj == NULL)
1055 htab->elf.dynobj = abfd;
1056 if (!create_got_section (htab->elf.dynobj, info))
1057 return FALSE;
1058 }
1059 if (r_type != R_386_TLS_IE)
1060 break;
1061 /* Fall through */
1062
1063 case R_386_TLS_LE_32:
1064 case R_386_TLS_LE:
1065 if (!info->shared)
1066 break;
1067 info->flags |= DF_STATIC_TLS;
1068 /* Fall through */
1069
1070 case R_386_32:
1071 case R_386_PC32:
1072 if (h != NULL && !info->shared)
1073 {
1074 /* If this reloc is in a read-only section, we might
1075 need a copy reloc. We can't check reliably at this
1076 stage whether the section is read-only, as input
1077 sections have not yet been mapped to output sections.
1078 Tentatively set the flag for now, and correct in
1079 adjust_dynamic_symbol. */
1080 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1081
1082 /* We may need a .plt entry if the function this reloc
1083 refers to is in a shared lib. */
1084 h->plt.refcount += 1;
1085 }
1086
1087 /* If we are creating a shared library, and this is a reloc
1088 against a global symbol, or a non PC relative reloc
1089 against a local symbol, then we need to copy the reloc
1090 into the shared library. However, if we are linking with
1091 -Bsymbolic, we do not need to copy a reloc against a
1092 global symbol which is defined in an object we are
1093 including in the link (i.e., DEF_REGULAR is set). At
1094 this point we have not seen all the input files, so it is
1095 possible that DEF_REGULAR is not set now but will be set
1096 later (it is never cleared). In case of a weak definition,
1097 DEF_REGULAR may be cleared later by a strong definition in
1098 a shared library. We account for that possibility below by
1099 storing information in the relocs_copied field of the hash
1100 table entry. A similar situation occurs when creating
1101 shared libraries and symbol visibility changes render the
1102 symbol local.
1103
1104 If on the other hand, we are creating an executable, we
1105 may need to keep relocations for symbols satisfied by a
1106 dynamic library if we manage to avoid copy relocs for the
1107 symbol. */
1108 if ((info->shared
1109 && (sec->flags & SEC_ALLOC) != 0
1110 && (r_type != R_386_PC32
1111 || (h != NULL
1112 && (! info->symbolic
1113 || h->root.type == bfd_link_hash_defweak
1114 || (h->elf_link_hash_flags
1115 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1116 || (ELIMINATE_COPY_RELOCS
1117 && !info->shared
1118 && (sec->flags & SEC_ALLOC) != 0
1119 && h != NULL
1120 && (h->root.type == bfd_link_hash_defweak
1121 || (h->elf_link_hash_flags
1122 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1123 {
1124 struct elf_i386_dyn_relocs *p;
1125 struct elf_i386_dyn_relocs **head;
1126
1127 /* We must copy these reloc types into the output file.
1128 Create a reloc section in dynobj and make room for
1129 this reloc. */
1130 if (sreloc == NULL)
1131 {
1132 const char *name;
1133 bfd *dynobj;
1134 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1135 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1136
1137 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1138 if (name == NULL)
1139 return FALSE;
1140
1141 if (strncmp (name, ".rel", 4) != 0
1142 || strcmp (bfd_get_section_name (abfd, sec),
1143 name + 4) != 0)
1144 {
1145 (*_bfd_error_handler)
1146 (_("%s: bad relocation section name `%s\'"),
1147 bfd_archive_filename (abfd), name);
1148 }
1149
1150 if (htab->elf.dynobj == NULL)
1151 htab->elf.dynobj = abfd;
1152
1153 dynobj = htab->elf.dynobj;
1154 sreloc = bfd_get_section_by_name (dynobj, name);
1155 if (sreloc == NULL)
1156 {
1157 flagword flags;
1158
1159 sreloc = bfd_make_section (dynobj, name);
1160 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1161 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1162 if ((sec->flags & SEC_ALLOC) != 0)
1163 flags |= SEC_ALLOC | SEC_LOAD;
1164 if (sreloc == NULL
1165 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1166 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1167 return FALSE;
1168 }
1169 elf_section_data (sec)->sreloc = sreloc;
1170 }
1171
1172 /* If this is a global symbol, we count the number of
1173 relocations we need for this symbol. */
1174 if (h != NULL)
1175 {
1176 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1177 }
1178 else
1179 {
1180 /* Track dynamic relocs needed for local syms too.
1181 We really need local syms available to do this
1182 easily. Oh well. */
1183
1184 asection *s;
1185 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1186 sec, r_symndx);
1187 if (s == NULL)
1188 return FALSE;
1189
1190 head = ((struct elf_i386_dyn_relocs **)
1191 &elf_section_data (s)->local_dynrel);
1192 }
1193
1194 p = *head;
1195 if (p == NULL || p->sec != sec)
1196 {
1197 bfd_size_type amt = sizeof *p;
1198 p = ((struct elf_i386_dyn_relocs *)
1199 bfd_alloc (htab->elf.dynobj, amt));
1200 if (p == NULL)
1201 return FALSE;
1202 p->next = *head;
1203 *head = p;
1204 p->sec = sec;
1205 p->count = 0;
1206 p->pc_count = 0;
1207 }
1208
1209 p->count += 1;
1210 if (r_type == R_386_PC32)
1211 p->pc_count += 1;
1212 }
1213 break;
1214
1215 /* This relocation describes the C++ object vtable hierarchy.
1216 Reconstruct it for later use during GC. */
1217 case R_386_GNU_VTINHERIT:
1218 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1219 return FALSE;
1220 break;
1221
1222 /* This relocation describes which C++ vtable entries are actually
1223 used. Record for later use during GC. */
1224 case R_386_GNU_VTENTRY:
1225 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1226 return FALSE;
1227 break;
1228
1229 default:
1230 break;
1231 }
1232 }
1233
1234 return TRUE;
1235 }
1236
1237 /* Return the section that should be marked against GC for a given
1238 relocation. */
1239
1240 static asection *
1241 elf_i386_gc_mark_hook (sec, info, rel, h, sym)
1242 asection *sec;
1243 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1244 Elf_Internal_Rela *rel;
1245 struct elf_link_hash_entry *h;
1246 Elf_Internal_Sym *sym;
1247 {
1248 if (h != NULL)
1249 {
1250 switch (ELF32_R_TYPE (rel->r_info))
1251 {
1252 case R_386_GNU_VTINHERIT:
1253 case R_386_GNU_VTENTRY:
1254 break;
1255
1256 default:
1257 switch (h->root.type)
1258 {
1259 case bfd_link_hash_defined:
1260 case bfd_link_hash_defweak:
1261 return h->root.u.def.section;
1262
1263 case bfd_link_hash_common:
1264 return h->root.u.c.p->section;
1265
1266 default:
1267 break;
1268 }
1269 }
1270 }
1271 else
1272 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1273
1274 return NULL;
1275 }
1276
1277 /* Update the got entry reference counts for the section being removed. */
1278
1279 static bfd_boolean
1280 elf_i386_gc_sweep_hook (abfd, info, sec, relocs)
1281 bfd *abfd;
1282 struct bfd_link_info *info;
1283 asection *sec;
1284 const Elf_Internal_Rela *relocs;
1285 {
1286 Elf_Internal_Shdr *symtab_hdr;
1287 struct elf_link_hash_entry **sym_hashes;
1288 bfd_signed_vma *local_got_refcounts;
1289 const Elf_Internal_Rela *rel, *relend;
1290
1291 elf_section_data (sec)->local_dynrel = NULL;
1292
1293 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1294 sym_hashes = elf_sym_hashes (abfd);
1295 local_got_refcounts = elf_local_got_refcounts (abfd);
1296
1297 relend = relocs + sec->reloc_count;
1298 for (rel = relocs; rel < relend; rel++)
1299 {
1300 unsigned long r_symndx;
1301 unsigned int r_type;
1302 struct elf_link_hash_entry *h = NULL;
1303
1304 r_symndx = ELF32_R_SYM (rel->r_info);
1305 if (r_symndx >= symtab_hdr->sh_info)
1306 {
1307 struct elf_i386_link_hash_entry *eh;
1308 struct elf_i386_dyn_relocs **pp;
1309 struct elf_i386_dyn_relocs *p;
1310
1311 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1312 eh = (struct elf_i386_link_hash_entry *) h;
1313
1314 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1315 if (p->sec == sec)
1316 {
1317 /* Everything must go for SEC. */
1318 *pp = p->next;
1319 break;
1320 }
1321 }
1322
1323 r_type = ELF32_R_TYPE (rel->r_info);
1324 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1325 switch (r_type)
1326 {
1327 case R_386_TLS_LDM:
1328 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1329 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1330 break;
1331
1332 case R_386_TLS_GD:
1333 case R_386_TLS_IE_32:
1334 case R_386_TLS_IE:
1335 case R_386_TLS_GOTIE:
1336 case R_386_GOT32:
1337 if (h != NULL)
1338 {
1339 if (h->got.refcount > 0)
1340 h->got.refcount -= 1;
1341 }
1342 else if (local_got_refcounts != NULL)
1343 {
1344 if (local_got_refcounts[r_symndx] > 0)
1345 local_got_refcounts[r_symndx] -= 1;
1346 }
1347 break;
1348
1349 case R_386_32:
1350 case R_386_PC32:
1351 if (info->shared)
1352 break;
1353 /* Fall through */
1354
1355 case R_386_PLT32:
1356 if (h != NULL)
1357 {
1358 if (h->plt.refcount > 0)
1359 h->plt.refcount -= 1;
1360 }
1361 break;
1362
1363 default:
1364 break;
1365 }
1366 }
1367
1368 return TRUE;
1369 }
1370
1371 /* Adjust a symbol defined by a dynamic object and referenced by a
1372 regular object. The current definition is in some section of the
1373 dynamic object, but we're not including those sections. We have to
1374 change the definition to something the rest of the link can
1375 understand. */
1376
1377 static bfd_boolean
1378 elf_i386_adjust_dynamic_symbol (info, h)
1379 struct bfd_link_info *info;
1380 struct elf_link_hash_entry *h;
1381 {
1382 struct elf_i386_link_hash_table *htab;
1383 asection *s;
1384 unsigned int power_of_two;
1385
1386 /* If this is a function, put it in the procedure linkage table. We
1387 will fill in the contents of the procedure linkage table later,
1388 when we know the address of the .got section. */
1389 if (h->type == STT_FUNC
1390 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1391 {
1392 if (h->plt.refcount <= 0
1393 || SYMBOL_CALLS_LOCAL (info, h)
1394 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1395 && h->root.type == bfd_link_hash_undefweak))
1396 {
1397 /* This case can occur if we saw a PLT32 reloc in an input
1398 file, but the symbol was never referred to by a dynamic
1399 object, or if all references were garbage collected. In
1400 such a case, we don't actually need to build a procedure
1401 linkage table, and we can just do a PC32 reloc instead. */
1402 h->plt.offset = (bfd_vma) -1;
1403 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1404 }
1405
1406 return TRUE;
1407 }
1408 else
1409 /* It's possible that we incorrectly decided a .plt reloc was
1410 needed for an R_386_PC32 reloc to a non-function sym in
1411 check_relocs. We can't decide accurately between function and
1412 non-function syms in check-relocs; Objects loaded later in
1413 the link may change h->type. So fix it now. */
1414 h->plt.offset = (bfd_vma) -1;
1415
1416 /* If this is a weak symbol, and there is a real definition, the
1417 processor independent code will have arranged for us to see the
1418 real definition first, and we can just use the same value. */
1419 if (h->weakdef != NULL)
1420 {
1421 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1422 || h->weakdef->root.type == bfd_link_hash_defweak);
1423 h->root.u.def.section = h->weakdef->root.u.def.section;
1424 h->root.u.def.value = h->weakdef->root.u.def.value;
1425 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1426 h->elf_link_hash_flags
1427 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1428 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1429 return TRUE;
1430 }
1431
1432 /* This is a reference to a symbol defined by a dynamic object which
1433 is not a function. */
1434
1435 /* If we are creating a shared library, we must presume that the
1436 only references to the symbol are via the global offset table.
1437 For such cases we need not do anything here; the relocations will
1438 be handled correctly by relocate_section. */
1439 if (info->shared)
1440 return TRUE;
1441
1442 /* If there are no references to this symbol that do not use the
1443 GOT, we don't need to generate a copy reloc. */
1444 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1445 return TRUE;
1446
1447 /* If -z nocopyreloc was given, we won't generate them either. */
1448 if (info->nocopyreloc)
1449 {
1450 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1451 return TRUE;
1452 }
1453
1454 if (ELIMINATE_COPY_RELOCS)
1455 {
1456 struct elf_i386_link_hash_entry * eh;
1457 struct elf_i386_dyn_relocs *p;
1458
1459 eh = (struct elf_i386_link_hash_entry *) h;
1460 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1461 {
1462 s = p->sec->output_section;
1463 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1464 break;
1465 }
1466
1467 /* If we didn't find any dynamic relocs in read-only sections, then
1468 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1469 if (p == NULL)
1470 {
1471 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1472 return TRUE;
1473 }
1474 }
1475
1476 /* We must allocate the symbol in our .dynbss section, which will
1477 become part of the .bss section of the executable. There will be
1478 an entry for this symbol in the .dynsym section. The dynamic
1479 object will contain position independent code, so all references
1480 from the dynamic object to this symbol will go through the global
1481 offset table. The dynamic linker will use the .dynsym entry to
1482 determine the address it must put in the global offset table, so
1483 both the dynamic object and the regular object will refer to the
1484 same memory location for the variable. */
1485
1486 htab = elf_i386_hash_table (info);
1487
1488 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1489 copy the initial value out of the dynamic object and into the
1490 runtime process image. */
1491 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1492 {
1493 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel);
1494 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1495 }
1496
1497 /* We need to figure out the alignment required for this symbol. I
1498 have no idea how ELF linkers handle this. */
1499 power_of_two = bfd_log2 (h->size);
1500 if (power_of_two > 3)
1501 power_of_two = 3;
1502
1503 /* Apply the required alignment. */
1504 s = htab->sdynbss;
1505 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1506 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1507 {
1508 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1509 return FALSE;
1510 }
1511
1512 /* Define the symbol as being at this point in the section. */
1513 h->root.u.def.section = s;
1514 h->root.u.def.value = s->_raw_size;
1515
1516 /* Increment the section size to make room for the symbol. */
1517 s->_raw_size += h->size;
1518
1519 return TRUE;
1520 }
1521
1522 /* This is the condition under which elf_i386_finish_dynamic_symbol
1523 will be called from elflink.h. If elflink.h doesn't call our
1524 finish_dynamic_symbol routine, we'll need to do something about
1525 initializing any .plt and .got entries in elf_i386_relocate_section. */
1526 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1527 ((DYN) \
1528 && ((SHARED) \
1529 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1530 && ((H)->dynindx != -1 \
1531 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1532
1533 /* Allocate space in .plt, .got and associated reloc sections for
1534 dynamic relocs. */
1535
1536 static bfd_boolean
1537 allocate_dynrelocs (h, inf)
1538 struct elf_link_hash_entry *h;
1539 PTR inf;
1540 {
1541 struct bfd_link_info *info;
1542 struct elf_i386_link_hash_table *htab;
1543 struct elf_i386_link_hash_entry *eh;
1544 struct elf_i386_dyn_relocs *p;
1545
1546 if (h->root.type == bfd_link_hash_indirect)
1547 return TRUE;
1548
1549 if (h->root.type == bfd_link_hash_warning)
1550 /* When warning symbols are created, they **replace** the "real"
1551 entry in the hash table, thus we never get to see the real
1552 symbol in a hash traversal. So look at it now. */
1553 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1554
1555 info = (struct bfd_link_info *) inf;
1556 htab = elf_i386_hash_table (info);
1557
1558 if (htab->elf.dynamic_sections_created
1559 && h->plt.refcount > 0)
1560 {
1561 /* Make sure this symbol is output as a dynamic symbol.
1562 Undefined weak syms won't yet be marked as dynamic. */
1563 if (h->dynindx == -1
1564 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1565 {
1566 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1567 return FALSE;
1568 }
1569
1570 if (info->shared
1571 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1572 {
1573 asection *s = htab->splt;
1574
1575 /* If this is the first .plt entry, make room for the special
1576 first entry. */
1577 if (s->_raw_size == 0)
1578 s->_raw_size += PLT_ENTRY_SIZE;
1579
1580 h->plt.offset = s->_raw_size;
1581
1582 /* If this symbol is not defined in a regular file, and we are
1583 not generating a shared library, then set the symbol to this
1584 location in the .plt. This is required to make function
1585 pointers compare as equal between the normal executable and
1586 the shared library. */
1587 if (! info->shared
1588 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1589 {
1590 h->root.u.def.section = s;
1591 h->root.u.def.value = h->plt.offset;
1592 }
1593
1594 /* Make room for this entry. */
1595 s->_raw_size += PLT_ENTRY_SIZE;
1596
1597 /* We also need to make an entry in the .got.plt section, which
1598 will be placed in the .got section by the linker script. */
1599 htab->sgotplt->_raw_size += 4;
1600
1601 /* We also need to make an entry in the .rel.plt section. */
1602 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
1603 }
1604 else
1605 {
1606 h->plt.offset = (bfd_vma) -1;
1607 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1608 }
1609 }
1610 else
1611 {
1612 h->plt.offset = (bfd_vma) -1;
1613 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1614 }
1615
1616 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1617 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1618 if (h->got.refcount > 0
1619 && !info->shared
1620 && h->dynindx == -1
1621 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1622 h->got.offset = (bfd_vma) -1;
1623 else if (h->got.refcount > 0)
1624 {
1625 asection *s;
1626 bfd_boolean dyn;
1627 int tls_type = elf_i386_hash_entry(h)->tls_type;
1628
1629 /* Make sure this symbol is output as a dynamic symbol.
1630 Undefined weak syms won't yet be marked as dynamic. */
1631 if (h->dynindx == -1
1632 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1633 {
1634 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1635 return FALSE;
1636 }
1637
1638 s = htab->sgot;
1639 h->got.offset = s->_raw_size;
1640 s->_raw_size += 4;
1641 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1642 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1643 s->_raw_size += 4;
1644 dyn = htab->elf.dynamic_sections_created;
1645 /* R_386_TLS_IE_32 needs one dynamic relocation,
1646 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1647 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1648 need two), R_386_TLS_GD needs one if local symbol and two if
1649 global. */
1650 if (tls_type == GOT_TLS_IE_BOTH)
1651 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1652 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1653 || (tls_type & GOT_TLS_IE))
1654 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1655 else if (tls_type == GOT_TLS_GD)
1656 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1657 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1658 || h->root.type != bfd_link_hash_undefweak)
1659 && (info->shared
1660 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1661 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1662 }
1663 else
1664 h->got.offset = (bfd_vma) -1;
1665
1666 eh = (struct elf_i386_link_hash_entry *) h;
1667 if (eh->dyn_relocs == NULL)
1668 return TRUE;
1669
1670 /* In the shared -Bsymbolic case, discard space allocated for
1671 dynamic pc-relative relocs against symbols which turn out to be
1672 defined in regular objects. For the normal shared case, discard
1673 space for pc-relative relocs that have become local due to symbol
1674 visibility changes. */
1675
1676 if (info->shared)
1677 {
1678 /* The only reloc that uses pc_count is R_386_PC32, which will
1679 appear on a call or on something like ".long foo - .". We
1680 want calls to protected symbols to resolve directly to the
1681 function rather than going via the plt. If people want
1682 function pointer comparisons to work as expected then they
1683 should avoid writing assembly like ".long foo - .". */
1684 if (SYMBOL_CALLS_LOCAL (info, h))
1685 {
1686 struct elf_i386_dyn_relocs **pp;
1687
1688 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1689 {
1690 p->count -= p->pc_count;
1691 p->pc_count = 0;
1692 if (p->count == 0)
1693 *pp = p->next;
1694 else
1695 pp = &p->next;
1696 }
1697 }
1698
1699 /* Also discard relocs on undefined weak syms with non-default
1700 visibility. */
1701 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1702 && h->root.type == bfd_link_hash_undefweak)
1703 eh->dyn_relocs = NULL;
1704 }
1705 else if (ELIMINATE_COPY_RELOCS)
1706 {
1707 /* For the non-shared case, discard space for relocs against
1708 symbols which turn out to need copy relocs or are not
1709 dynamic. */
1710
1711 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1712 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1713 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1714 || (htab->elf.dynamic_sections_created
1715 && (h->root.type == bfd_link_hash_undefweak
1716 || h->root.type == bfd_link_hash_undefined))))
1717 {
1718 /* Make sure this symbol is output as a dynamic symbol.
1719 Undefined weak syms won't yet be marked as dynamic. */
1720 if (h->dynindx == -1
1721 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1722 {
1723 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1724 return FALSE;
1725 }
1726
1727 /* If that succeeded, we know we'll be keeping all the
1728 relocs. */
1729 if (h->dynindx != -1)
1730 goto keep;
1731 }
1732
1733 eh->dyn_relocs = NULL;
1734
1735 keep: ;
1736 }
1737
1738 /* Finally, allocate space. */
1739 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1740 {
1741 asection *sreloc = elf_section_data (p->sec)->sreloc;
1742 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1743 }
1744
1745 return TRUE;
1746 }
1747
1748 /* Find any dynamic relocs that apply to read-only sections. */
1749
1750 static bfd_boolean
1751 readonly_dynrelocs (h, inf)
1752 struct elf_link_hash_entry *h;
1753 PTR inf;
1754 {
1755 struct elf_i386_link_hash_entry *eh;
1756 struct elf_i386_dyn_relocs *p;
1757
1758 if (h->root.type == bfd_link_hash_warning)
1759 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1760
1761 eh = (struct elf_i386_link_hash_entry *) h;
1762 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1763 {
1764 asection *s = p->sec->output_section;
1765
1766 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1767 {
1768 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1769
1770 info->flags |= DF_TEXTREL;
1771
1772 /* Not an error, just cut short the traversal. */
1773 return FALSE;
1774 }
1775 }
1776 return TRUE;
1777 }
1778
1779 /* Set the sizes of the dynamic sections. */
1780
1781 static bfd_boolean
1782 elf_i386_size_dynamic_sections (output_bfd, info)
1783 bfd *output_bfd ATTRIBUTE_UNUSED;
1784 struct bfd_link_info *info;
1785 {
1786 struct elf_i386_link_hash_table *htab;
1787 bfd *dynobj;
1788 asection *s;
1789 bfd_boolean relocs;
1790 bfd *ibfd;
1791
1792 htab = elf_i386_hash_table (info);
1793 dynobj = htab->elf.dynobj;
1794 if (dynobj == NULL)
1795 abort ();
1796
1797 if (htab->elf.dynamic_sections_created)
1798 {
1799 /* Set the contents of the .interp section to the interpreter. */
1800 if (info->executable)
1801 {
1802 s = bfd_get_section_by_name (dynobj, ".interp");
1803 if (s == NULL)
1804 abort ();
1805 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1806 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1807 }
1808 }
1809
1810 /* Set up .got offsets for local syms, and space for local dynamic
1811 relocs. */
1812 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1813 {
1814 bfd_signed_vma *local_got;
1815 bfd_signed_vma *end_local_got;
1816 char *local_tls_type;
1817 bfd_size_type locsymcount;
1818 Elf_Internal_Shdr *symtab_hdr;
1819 asection *srel;
1820
1821 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1822 continue;
1823
1824 for (s = ibfd->sections; s != NULL; s = s->next)
1825 {
1826 struct elf_i386_dyn_relocs *p;
1827
1828 for (p = *((struct elf_i386_dyn_relocs **)
1829 &elf_section_data (s)->local_dynrel);
1830 p != NULL;
1831 p = p->next)
1832 {
1833 if (!bfd_is_abs_section (p->sec)
1834 && bfd_is_abs_section (p->sec->output_section))
1835 {
1836 /* Input section has been discarded, either because
1837 it is a copy of a linkonce section or due to
1838 linker script /DISCARD/, so we'll be discarding
1839 the relocs too. */
1840 }
1841 else if (p->count != 0)
1842 {
1843 srel = elf_section_data (p->sec)->sreloc;
1844 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1845 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1846 info->flags |= DF_TEXTREL;
1847 }
1848 }
1849 }
1850
1851 local_got = elf_local_got_refcounts (ibfd);
1852 if (!local_got)
1853 continue;
1854
1855 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1856 locsymcount = symtab_hdr->sh_info;
1857 end_local_got = local_got + locsymcount;
1858 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1859 s = htab->sgot;
1860 srel = htab->srelgot;
1861 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1862 {
1863 if (*local_got > 0)
1864 {
1865 *local_got = s->_raw_size;
1866 s->_raw_size += 4;
1867 if (*local_tls_type == GOT_TLS_GD
1868 || *local_tls_type == GOT_TLS_IE_BOTH)
1869 s->_raw_size += 4;
1870 if (info->shared
1871 || *local_tls_type == GOT_TLS_GD
1872 || (*local_tls_type & GOT_TLS_IE))
1873 {
1874 if (*local_tls_type == GOT_TLS_IE_BOTH)
1875 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1876 else
1877 srel->_raw_size += sizeof (Elf32_External_Rel);
1878 }
1879 }
1880 else
1881 *local_got = (bfd_vma) -1;
1882 }
1883 }
1884
1885 if (htab->tls_ldm_got.refcount > 0)
1886 {
1887 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1888 relocs. */
1889 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1890 htab->sgot->_raw_size += 8;
1891 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1892 }
1893 else
1894 htab->tls_ldm_got.offset = -1;
1895
1896 /* Allocate global sym .plt and .got entries, and space for global
1897 sym dynamic relocs. */
1898 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1899
1900 /* We now have determined the sizes of the various dynamic sections.
1901 Allocate memory for them. */
1902 relocs = FALSE;
1903 for (s = dynobj->sections; s != NULL; s = s->next)
1904 {
1905 if ((s->flags & SEC_LINKER_CREATED) == 0)
1906 continue;
1907
1908 if (s == htab->splt
1909 || s == htab->sgot
1910 || s == htab->sgotplt)
1911 {
1912 /* Strip this section if we don't need it; see the
1913 comment below. */
1914 }
1915 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1916 {
1917 if (s->_raw_size != 0 && s != htab->srelplt)
1918 relocs = TRUE;
1919
1920 /* We use the reloc_count field as a counter if we need
1921 to copy relocs into the output file. */
1922 s->reloc_count = 0;
1923 }
1924 else
1925 {
1926 /* It's not one of our sections, so don't allocate space. */
1927 continue;
1928 }
1929
1930 if (s->_raw_size == 0)
1931 {
1932 /* If we don't need this section, strip it from the
1933 output file. This is mostly to handle .rel.bss and
1934 .rel.plt. We must create both sections in
1935 create_dynamic_sections, because they must be created
1936 before the linker maps input sections to output
1937 sections. The linker does that before
1938 adjust_dynamic_symbol is called, and it is that
1939 function which decides whether anything needs to go
1940 into these sections. */
1941
1942 _bfd_strip_section_from_output (info, s);
1943 continue;
1944 }
1945
1946 /* Allocate memory for the section contents. We use bfd_zalloc
1947 here in case unused entries are not reclaimed before the
1948 section's contents are written out. This should not happen,
1949 but this way if it does, we get a R_386_NONE reloc instead
1950 of garbage. */
1951 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1952 if (s->contents == NULL)
1953 return FALSE;
1954 }
1955
1956 if (htab->elf.dynamic_sections_created)
1957 {
1958 /* Add some entries to the .dynamic section. We fill in the
1959 values later, in elf_i386_finish_dynamic_sections, but we
1960 must add the entries now so that we get the correct size for
1961 the .dynamic section. The DT_DEBUG entry is filled in by the
1962 dynamic linker and used by the debugger. */
1963 #define add_dynamic_entry(TAG, VAL) \
1964 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1965
1966 if (info->executable)
1967 {
1968 if (!add_dynamic_entry (DT_DEBUG, 0))
1969 return FALSE;
1970 }
1971
1972 if (htab->splt->_raw_size != 0)
1973 {
1974 if (!add_dynamic_entry (DT_PLTGOT, 0)
1975 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1976 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1977 || !add_dynamic_entry (DT_JMPREL, 0))
1978 return FALSE;
1979 }
1980
1981 if (relocs)
1982 {
1983 if (!add_dynamic_entry (DT_REL, 0)
1984 || !add_dynamic_entry (DT_RELSZ, 0)
1985 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1986 return FALSE;
1987
1988 /* If any dynamic relocs apply to a read-only section,
1989 then we need a DT_TEXTREL entry. */
1990 if ((info->flags & DF_TEXTREL) == 0)
1991 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1992 (PTR) info);
1993
1994 if ((info->flags & DF_TEXTREL) != 0)
1995 {
1996 if (!add_dynamic_entry (DT_TEXTREL, 0))
1997 return FALSE;
1998 }
1999 }
2000 }
2001 #undef add_dynamic_entry
2002
2003 return TRUE;
2004 }
2005
2006 /* Set the correct type for an x86 ELF section. We do this by the
2007 section name, which is a hack, but ought to work. */
2008
2009 static bfd_boolean
2010 elf_i386_fake_sections (abfd, hdr, sec)
2011 bfd *abfd ATTRIBUTE_UNUSED;
2012 Elf_Internal_Shdr *hdr;
2013 asection *sec;
2014 {
2015 register const char *name;
2016
2017 name = bfd_get_section_name (abfd, sec);
2018
2019 /* This is an ugly, but unfortunately necessary hack that is
2020 needed when producing EFI binaries on x86. It tells
2021 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2022 containing ELF relocation info. We need this hack in order to
2023 be able to generate ELF binaries that can be translated into
2024 EFI applications (which are essentially COFF objects). Those
2025 files contain a COFF ".reloc" section inside an ELFNN object,
2026 which would normally cause BFD to segfault because it would
2027 attempt to interpret this section as containing relocation
2028 entries for section "oc". With this hack enabled, ".reloc"
2029 will be treated as a normal data section, which will avoid the
2030 segfault. However, you won't be able to create an ELFNN binary
2031 with a section named "oc" that needs relocations, but that's
2032 the kind of ugly side-effects you get when detecting section
2033 types based on their names... In practice, this limitation is
2034 unlikely to bite. */
2035 if (strcmp (name, ".reloc") == 0)
2036 hdr->sh_type = SHT_PROGBITS;
2037
2038 return TRUE;
2039 }
2040
2041 /* Return the base VMA address which should be subtracted from real addresses
2042 when resolving @dtpoff relocation.
2043 This is PT_TLS segment p_vaddr. */
2044
2045 static bfd_vma
2046 dtpoff_base (info)
2047 struct bfd_link_info *info;
2048 {
2049 /* If tls_segment is NULL, we should have signalled an error already. */
2050 if (elf_hash_table (info)->tls_segment == NULL)
2051 return 0;
2052 return elf_hash_table (info)->tls_segment->start;
2053 }
2054
2055 /* Return the relocation value for @tpoff relocation
2056 if STT_TLS virtual address is ADDRESS. */
2057
2058 static bfd_vma
2059 tpoff (info, address)
2060 struct bfd_link_info *info;
2061 bfd_vma address;
2062 {
2063 struct elf_link_tls_segment *tls_segment
2064 = elf_hash_table (info)->tls_segment;
2065
2066 /* If tls_segment is NULL, we should have signalled an error already. */
2067 if (tls_segment == NULL)
2068 return 0;
2069 return (align_power (tls_segment->size, tls_segment->align)
2070 + tls_segment->start - address);
2071 }
2072
2073 /* Relocate an i386 ELF section. */
2074
2075 static bfd_boolean
2076 elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
2077 contents, relocs, local_syms, local_sections)
2078 bfd *output_bfd;
2079 struct bfd_link_info *info;
2080 bfd *input_bfd;
2081 asection *input_section;
2082 bfd_byte *contents;
2083 Elf_Internal_Rela *relocs;
2084 Elf_Internal_Sym *local_syms;
2085 asection **local_sections;
2086 {
2087 struct elf_i386_link_hash_table *htab;
2088 Elf_Internal_Shdr *symtab_hdr;
2089 struct elf_link_hash_entry **sym_hashes;
2090 bfd_vma *local_got_offsets;
2091 Elf_Internal_Rela *rel;
2092 Elf_Internal_Rela *relend;
2093
2094 htab = elf_i386_hash_table (info);
2095 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2096 sym_hashes = elf_sym_hashes (input_bfd);
2097 local_got_offsets = elf_local_got_offsets (input_bfd);
2098
2099 rel = relocs;
2100 relend = relocs + input_section->reloc_count;
2101 for (; rel < relend; rel++)
2102 {
2103 unsigned int r_type;
2104 reloc_howto_type *howto;
2105 unsigned long r_symndx;
2106 struct elf_link_hash_entry *h;
2107 Elf_Internal_Sym *sym;
2108 asection *sec;
2109 bfd_vma off;
2110 bfd_vma relocation;
2111 bfd_boolean unresolved_reloc;
2112 bfd_reloc_status_type r;
2113 unsigned int indx;
2114 int tls_type;
2115
2116 r_type = ELF32_R_TYPE (rel->r_info);
2117 if (r_type == (int) R_386_GNU_VTINHERIT
2118 || r_type == (int) R_386_GNU_VTENTRY)
2119 continue;
2120
2121 if ((indx = (unsigned) r_type) >= R_386_standard
2122 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2123 >= R_386_ext - R_386_standard)
2124 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2125 >= R_386_tls - R_386_ext))
2126 {
2127 bfd_set_error (bfd_error_bad_value);
2128 return FALSE;
2129 }
2130 howto = elf_howto_table + indx;
2131
2132 r_symndx = ELF32_R_SYM (rel->r_info);
2133
2134 if (info->relocateable)
2135 {
2136 bfd_vma val;
2137 bfd_byte *where;
2138
2139 /* This is a relocatable link. We don't have to change
2140 anything, unless the reloc is against a section symbol,
2141 in which case we have to adjust according to where the
2142 section symbol winds up in the output section. */
2143 if (r_symndx >= symtab_hdr->sh_info)
2144 continue;
2145
2146 sym = local_syms + r_symndx;
2147 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2148 continue;
2149
2150 sec = local_sections[r_symndx];
2151 val = sec->output_offset;
2152 if (val == 0)
2153 continue;
2154
2155 where = contents + rel->r_offset;
2156 switch (howto->size)
2157 {
2158 /* FIXME: overflow checks. */
2159 case 0:
2160 val += bfd_get_8 (input_bfd, where);
2161 bfd_put_8 (input_bfd, val, where);
2162 break;
2163 case 1:
2164 val += bfd_get_16 (input_bfd, where);
2165 bfd_put_16 (input_bfd, val, where);
2166 break;
2167 case 2:
2168 val += bfd_get_32 (input_bfd, where);
2169 bfd_put_32 (input_bfd, val, where);
2170 break;
2171 default:
2172 abort ();
2173 }
2174 continue;
2175 }
2176
2177 /* This is a final link. */
2178 h = NULL;
2179 sym = NULL;
2180 sec = NULL;
2181 unresolved_reloc = FALSE;
2182 if (r_symndx < symtab_hdr->sh_info)
2183 {
2184 sym = local_syms + r_symndx;
2185 sec = local_sections[r_symndx];
2186 relocation = (sec->output_section->vma
2187 + sec->output_offset
2188 + sym->st_value);
2189 if ((sec->flags & SEC_MERGE)
2190 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2191 {
2192 asection *msec;
2193 bfd_vma addend;
2194 bfd_byte *where = contents + rel->r_offset;
2195
2196 switch (howto->size)
2197 {
2198 case 0:
2199 addend = bfd_get_8 (input_bfd, where);
2200 if (howto->pc_relative)
2201 {
2202 addend = (addend ^ 0x80) - 0x80;
2203 addend += 1;
2204 }
2205 break;
2206 case 1:
2207 addend = bfd_get_16 (input_bfd, where);
2208 if (howto->pc_relative)
2209 {
2210 addend = (addend ^ 0x8000) - 0x8000;
2211 addend += 2;
2212 }
2213 break;
2214 case 2:
2215 addend = bfd_get_32 (input_bfd, where);
2216 if (howto->pc_relative)
2217 {
2218 addend = (addend ^ 0x80000000) - 0x80000000;
2219 addend += 4;
2220 }
2221 break;
2222 default:
2223 abort ();
2224 }
2225
2226 msec = sec;
2227 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2228 addend -= relocation;
2229 addend += msec->output_section->vma + msec->output_offset;
2230
2231 switch (howto->size)
2232 {
2233 case 0:
2234 /* FIXME: overflow checks. */
2235 if (howto->pc_relative)
2236 addend -= 1;
2237 bfd_put_8 (input_bfd, addend, where);
2238 break;
2239 case 1:
2240 if (howto->pc_relative)
2241 addend -= 2;
2242 bfd_put_16 (input_bfd, addend, where);
2243 break;
2244 case 2:
2245 if (howto->pc_relative)
2246 addend -= 4;
2247 bfd_put_32 (input_bfd, addend, where);
2248 break;
2249 }
2250 }
2251 }
2252 else
2253 {
2254 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2255 while (h->root.type == bfd_link_hash_indirect
2256 || h->root.type == bfd_link_hash_warning)
2257 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2258
2259 relocation = 0;
2260 if (h->root.type == bfd_link_hash_defined
2261 || h->root.type == bfd_link_hash_defweak)
2262 {
2263 sec = h->root.u.def.section;
2264 if (sec->output_section == NULL)
2265 /* Set a flag that will be cleared later if we find a
2266 relocation value for this symbol. output_section
2267 is typically NULL for symbols satisfied by a shared
2268 library. */
2269 unresolved_reloc = TRUE;
2270 else
2271 relocation = (h->root.u.def.value
2272 + sec->output_section->vma
2273 + sec->output_offset);
2274 }
2275 else if (h->root.type == bfd_link_hash_undefweak)
2276 ;
2277 else if (info->shared
2278 && !info->no_undefined
2279 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2280 ;
2281 else
2282 {
2283 if (! ((*info->callbacks->undefined_symbol)
2284 (info, h->root.root.string, input_bfd,
2285 input_section, rel->r_offset,
2286 (!info->shared || info->no_undefined
2287 || ELF_ST_VISIBILITY (h->other)))))
2288 return FALSE;
2289 }
2290 }
2291
2292 switch (r_type)
2293 {
2294 case R_386_GOT32:
2295 /* Relocation is to the entry for this symbol in the global
2296 offset table. */
2297 if (htab->sgot == NULL)
2298 abort ();
2299
2300 if (h != NULL)
2301 {
2302 bfd_boolean dyn;
2303
2304 off = h->got.offset;
2305 dyn = htab->elf.dynamic_sections_created;
2306 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2307 || (info->shared
2308 && SYMBOL_REFERENCES_LOCAL (info, h))
2309 || (ELF_ST_VISIBILITY (h->other)
2310 && h->root.type == bfd_link_hash_undefweak))
2311 {
2312 /* This is actually a static link, or it is a
2313 -Bsymbolic link and the symbol is defined
2314 locally, or the symbol was forced to be local
2315 because of a version file. We must initialize
2316 this entry in the global offset table. Since the
2317 offset must always be a multiple of 4, we use the
2318 least significant bit to record whether we have
2319 initialized it already.
2320
2321 When doing a dynamic link, we create a .rel.got
2322 relocation entry to initialize the value. This
2323 is done in the finish_dynamic_symbol routine. */
2324 if ((off & 1) != 0)
2325 off &= ~1;
2326 else
2327 {
2328 bfd_put_32 (output_bfd, relocation,
2329 htab->sgot->contents + off);
2330 h->got.offset |= 1;
2331 }
2332 }
2333 else
2334 unresolved_reloc = FALSE;
2335 }
2336 else
2337 {
2338 if (local_got_offsets == NULL)
2339 abort ();
2340
2341 off = local_got_offsets[r_symndx];
2342
2343 /* The offset must always be a multiple of 4. We use
2344 the least significant bit to record whether we have
2345 already generated the necessary reloc. */
2346 if ((off & 1) != 0)
2347 off &= ~1;
2348 else
2349 {
2350 bfd_put_32 (output_bfd, relocation,
2351 htab->sgot->contents + off);
2352
2353 if (info->shared)
2354 {
2355 asection *s;
2356 Elf_Internal_Rela outrel;
2357 bfd_byte *loc;
2358
2359 s = htab->srelgot;
2360 if (s == NULL)
2361 abort ();
2362
2363 outrel.r_offset = (htab->sgot->output_section->vma
2364 + htab->sgot->output_offset
2365 + off);
2366 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2367 loc = s->contents;
2368 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2369 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2370 }
2371
2372 local_got_offsets[r_symndx] |= 1;
2373 }
2374 }
2375
2376 if (off >= (bfd_vma) -2)
2377 abort ();
2378
2379 relocation = htab->sgot->output_offset + off;
2380 break;
2381
2382 case R_386_GOTOFF:
2383 /* Relocation is relative to the start of the global offset
2384 table. */
2385
2386 /* Note that sgot->output_offset is not involved in this
2387 calculation. We always want the start of .got. If we
2388 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2389 permitted by the ABI, we might have to change this
2390 calculation. */
2391 relocation -= htab->sgot->output_section->vma;
2392 break;
2393
2394 case R_386_GOTPC:
2395 /* Use global offset table as symbol value. */
2396 relocation = htab->sgot->output_section->vma;
2397 unresolved_reloc = FALSE;
2398 break;
2399
2400 case R_386_PLT32:
2401 /* Relocation is to the entry for this symbol in the
2402 procedure linkage table. */
2403
2404 /* Resolve a PLT32 reloc against a local symbol directly,
2405 without using the procedure linkage table. */
2406 if (h == NULL)
2407 break;
2408
2409 if (h->plt.offset == (bfd_vma) -1
2410 || htab->splt == NULL)
2411 {
2412 /* We didn't make a PLT entry for this symbol. This
2413 happens when statically linking PIC code, or when
2414 using -Bsymbolic. */
2415 break;
2416 }
2417
2418 relocation = (htab->splt->output_section->vma
2419 + htab->splt->output_offset
2420 + h->plt.offset);
2421 unresolved_reloc = FALSE;
2422 break;
2423
2424 case R_386_32:
2425 case R_386_PC32:
2426 /* r_symndx will be zero only for relocs against symbols
2427 from removed linkonce sections, or sections discarded by
2428 a linker script. */
2429 if (r_symndx == 0
2430 || (input_section->flags & SEC_ALLOC) == 0)
2431 break;
2432
2433 if ((info->shared
2434 && (h == NULL
2435 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2436 || h->root.type != bfd_link_hash_undefweak)
2437 && (r_type != R_386_PC32
2438 || (h != NULL
2439 && !SYMBOL_CALLS_LOCAL (info, h))))
2440 || (ELIMINATE_COPY_RELOCS
2441 && !info->shared
2442 && h != NULL
2443 && h->dynindx != -1
2444 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2445 && (((h->elf_link_hash_flags
2446 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2447 && (h->elf_link_hash_flags
2448 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2449 || h->root.type == bfd_link_hash_undefweak
2450 || h->root.type == bfd_link_hash_undefined)))
2451 {
2452 Elf_Internal_Rela outrel;
2453 bfd_byte *loc;
2454 bfd_boolean skip, relocate;
2455 asection *sreloc;
2456
2457 /* When generating a shared object, these relocations
2458 are copied into the output file to be resolved at run
2459 time. */
2460
2461 skip = FALSE;
2462 relocate = FALSE;
2463
2464 outrel.r_offset =
2465 _bfd_elf_section_offset (output_bfd, info, input_section,
2466 rel->r_offset);
2467 if (outrel.r_offset == (bfd_vma) -1)
2468 skip = TRUE;
2469 else if (outrel.r_offset == (bfd_vma) -2)
2470 skip = TRUE, relocate = TRUE;
2471 outrel.r_offset += (input_section->output_section->vma
2472 + input_section->output_offset);
2473
2474 if (skip)
2475 memset (&outrel, 0, sizeof outrel);
2476 else if (h != NULL
2477 && h->dynindx != -1
2478 && (r_type == R_386_PC32
2479 || !info->shared
2480 || !info->symbolic
2481 || (h->elf_link_hash_flags
2482 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2483 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2484 else
2485 {
2486 /* This symbol is local, or marked to become local. */
2487 relocate = TRUE;
2488 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2489 }
2490
2491 sreloc = elf_section_data (input_section)->sreloc;
2492 if (sreloc == NULL)
2493 abort ();
2494
2495 loc = sreloc->contents;
2496 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2497 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2498
2499 /* If this reloc is against an external symbol, we do
2500 not want to fiddle with the addend. Otherwise, we
2501 need to include the symbol value so that it becomes
2502 an addend for the dynamic reloc. */
2503 if (! relocate)
2504 continue;
2505 }
2506 break;
2507
2508 case R_386_TLS_IE:
2509 if (info->shared)
2510 {
2511 Elf_Internal_Rela outrel;
2512 bfd_byte *loc;
2513 asection *sreloc;
2514
2515 outrel.r_offset = rel->r_offset
2516 + input_section->output_section->vma
2517 + input_section->output_offset;
2518 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2519 sreloc = elf_section_data (input_section)->sreloc;
2520 if (sreloc == NULL)
2521 abort ();
2522 loc = sreloc->contents;
2523 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2524 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2525 }
2526 /* Fall through */
2527
2528 case R_386_TLS_GD:
2529 case R_386_TLS_IE_32:
2530 case R_386_TLS_GOTIE:
2531 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2532 tls_type = GOT_UNKNOWN;
2533 if (h == NULL && local_got_offsets)
2534 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2535 else if (h != NULL)
2536 {
2537 tls_type = elf_i386_hash_entry(h)->tls_type;
2538 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2539 r_type = R_386_TLS_LE_32;
2540 }
2541 if (tls_type == GOT_TLS_IE)
2542 tls_type = GOT_TLS_IE_NEG;
2543 if (r_type == R_386_TLS_GD)
2544 {
2545 if (tls_type == GOT_TLS_IE_POS)
2546 r_type = R_386_TLS_GOTIE;
2547 else if (tls_type & GOT_TLS_IE)
2548 r_type = R_386_TLS_IE_32;
2549 }
2550
2551 if (r_type == R_386_TLS_LE_32)
2552 {
2553 BFD_ASSERT (! unresolved_reloc);
2554 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2555 {
2556 unsigned int val, type;
2557 bfd_vma roff;
2558
2559 /* GD->LE transition. */
2560 BFD_ASSERT (rel->r_offset >= 2);
2561 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2562 BFD_ASSERT (type == 0x8d || type == 0x04);
2563 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2564 BFD_ASSERT (bfd_get_8 (input_bfd,
2565 contents + rel->r_offset + 4)
2566 == 0xe8);
2567 BFD_ASSERT (rel + 1 < relend);
2568 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2569 roff = rel->r_offset + 5;
2570 val = bfd_get_8 (input_bfd,
2571 contents + rel->r_offset - 1);
2572 if (type == 0x04)
2573 {
2574 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2575 Change it into:
2576 movl %gs:0, %eax; subl $foo@tpoff, %eax
2577 (6 byte form of subl). */
2578 BFD_ASSERT (rel->r_offset >= 3);
2579 BFD_ASSERT (bfd_get_8 (input_bfd,
2580 contents + rel->r_offset - 3)
2581 == 0x8d);
2582 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2583 memcpy (contents + rel->r_offset - 3,
2584 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2585 }
2586 else
2587 {
2588 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2589 if (rel->r_offset + 10 <= input_section->_raw_size
2590 && bfd_get_8 (input_bfd,
2591 contents + rel->r_offset + 9) == 0x90)
2592 {
2593 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2594 Change it into:
2595 movl %gs:0, %eax; subl $foo@tpoff, %eax
2596 (6 byte form of subl). */
2597 memcpy (contents + rel->r_offset - 2,
2598 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2599 roff = rel->r_offset + 6;
2600 }
2601 else
2602 {
2603 /* leal foo(%reg), %eax; call ___tls_get_addr
2604 Change it into:
2605 movl %gs:0, %eax; subl $foo@tpoff, %eax
2606 (5 byte form of subl). */
2607 memcpy (contents + rel->r_offset - 2,
2608 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2609 }
2610 }
2611 bfd_put_32 (output_bfd, tpoff (info, relocation),
2612 contents + roff);
2613 /* Skip R_386_PLT32. */
2614 rel++;
2615 continue;
2616 }
2617 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2618 {
2619 unsigned int val, type;
2620
2621 /* IE->LE transition:
2622 Originally it can be one of:
2623 movl foo, %eax
2624 movl foo, %reg
2625 addl foo, %reg
2626 We change it into:
2627 movl $foo, %eax
2628 movl $foo, %reg
2629 addl $foo, %reg. */
2630 BFD_ASSERT (rel->r_offset >= 1);
2631 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2632 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2633 if (val == 0xa1)
2634 {
2635 /* movl foo, %eax. */
2636 bfd_put_8 (output_bfd, 0xb8, contents + rel->r_offset - 1);
2637 }
2638 else
2639 {
2640 BFD_ASSERT (rel->r_offset >= 2);
2641 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2642 switch (type)
2643 {
2644 case 0x8b:
2645 /* movl */
2646 BFD_ASSERT ((val & 0xc7) == 0x05);
2647 bfd_put_8 (output_bfd, 0xc7,
2648 contents + rel->r_offset - 2);
2649 bfd_put_8 (output_bfd,
2650 0xc0 | ((val >> 3) & 7),
2651 contents + rel->r_offset - 1);
2652 break;
2653 case 0x03:
2654 /* addl */
2655 BFD_ASSERT ((val & 0xc7) == 0x05);
2656 bfd_put_8 (output_bfd, 0x81,
2657 contents + rel->r_offset - 2);
2658 bfd_put_8 (output_bfd,
2659 0xc0 | ((val >> 3) & 7),
2660 contents + rel->r_offset - 1);
2661 break;
2662 default:
2663 BFD_FAIL ();
2664 break;
2665 }
2666 }
2667 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2668 contents + rel->r_offset);
2669 continue;
2670 }
2671 else
2672 {
2673 unsigned int val, type;
2674
2675 /* {IE_32,GOTIE}->LE transition:
2676 Originally it can be one of:
2677 subl foo(%reg1), %reg2
2678 movl foo(%reg1), %reg2
2679 addl foo(%reg1), %reg2
2680 We change it into:
2681 subl $foo, %reg2
2682 movl $foo, %reg2 (6 byte form)
2683 addl $foo, %reg2. */
2684 BFD_ASSERT (rel->r_offset >= 2);
2685 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2686 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2687 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2688 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2689 if (type == 0x8b)
2690 {
2691 /* movl */
2692 bfd_put_8 (output_bfd, 0xc7,
2693 contents + rel->r_offset - 2);
2694 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2695 contents + rel->r_offset - 1);
2696 }
2697 else if (type == 0x2b)
2698 {
2699 /* subl */
2700 bfd_put_8 (output_bfd, 0x81,
2701 contents + rel->r_offset - 2);
2702 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2703 contents + rel->r_offset - 1);
2704 }
2705 else if (type == 0x03)
2706 {
2707 /* addl */
2708 bfd_put_8 (output_bfd, 0x81,
2709 contents + rel->r_offset - 2);
2710 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2711 contents + rel->r_offset - 1);
2712 }
2713 else
2714 BFD_FAIL ();
2715 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2716 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2717 contents + rel->r_offset);
2718 else
2719 bfd_put_32 (output_bfd, tpoff (info, relocation),
2720 contents + rel->r_offset);
2721 continue;
2722 }
2723 }
2724
2725 if (htab->sgot == NULL)
2726 abort ();
2727
2728 if (h != NULL)
2729 off = h->got.offset;
2730 else
2731 {
2732 if (local_got_offsets == NULL)
2733 abort ();
2734
2735 off = local_got_offsets[r_symndx];
2736 }
2737
2738 if ((off & 1) != 0)
2739 off &= ~1;
2740 else
2741 {
2742 Elf_Internal_Rela outrel;
2743 bfd_byte *loc;
2744 int dr_type, indx;
2745
2746 if (htab->srelgot == NULL)
2747 abort ();
2748
2749 outrel.r_offset = (htab->sgot->output_section->vma
2750 + htab->sgot->output_offset + off);
2751
2752 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2753 if (r_type == R_386_TLS_GD)
2754 dr_type = R_386_TLS_DTPMOD32;
2755 else if (tls_type == GOT_TLS_IE_POS)
2756 dr_type = R_386_TLS_TPOFF;
2757 else
2758 dr_type = R_386_TLS_TPOFF32;
2759 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2760 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2761 htab->sgot->contents + off);
2762 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2763 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2764 htab->sgot->contents + off);
2765 else
2766 bfd_put_32 (output_bfd, 0,
2767 htab->sgot->contents + off);
2768 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2769 loc = htab->srelgot->contents;
2770 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2771 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2772
2773 if (r_type == R_386_TLS_GD)
2774 {
2775 if (indx == 0)
2776 {
2777 BFD_ASSERT (! unresolved_reloc);
2778 bfd_put_32 (output_bfd,
2779 relocation - dtpoff_base (info),
2780 htab->sgot->contents + off + 4);
2781 }
2782 else
2783 {
2784 bfd_put_32 (output_bfd, 0,
2785 htab->sgot->contents + off + 4);
2786 outrel.r_info = ELF32_R_INFO (indx,
2787 R_386_TLS_DTPOFF32);
2788 outrel.r_offset += 4;
2789 htab->srelgot->reloc_count++;
2790 loc += sizeof (Elf32_External_Rel);
2791 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2792 }
2793 }
2794 else if (tls_type == GOT_TLS_IE_BOTH)
2795 {
2796 bfd_put_32 (output_bfd,
2797 indx == 0 ? relocation - dtpoff_base (info) : 0,
2798 htab->sgot->contents + off + 4);
2799 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2800 outrel.r_offset += 4;
2801 htab->srelgot->reloc_count++;
2802 loc += sizeof (Elf32_External_Rel);
2803 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2804 }
2805
2806 if (h != NULL)
2807 h->got.offset |= 1;
2808 else
2809 local_got_offsets[r_symndx] |= 1;
2810 }
2811
2812 if (off >= (bfd_vma) -2)
2813 abort ();
2814 if (r_type == ELF32_R_TYPE (rel->r_info))
2815 {
2816 relocation = htab->sgot->output_offset + off;
2817 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2818 && tls_type == GOT_TLS_IE_BOTH)
2819 relocation += 4;
2820 if (r_type == R_386_TLS_IE)
2821 relocation += htab->sgot->output_section->vma;
2822 unresolved_reloc = FALSE;
2823 }
2824 else
2825 {
2826 unsigned int val, type;
2827 bfd_vma roff;
2828
2829 /* GD->IE transition. */
2830 BFD_ASSERT (rel->r_offset >= 2);
2831 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2832 BFD_ASSERT (type == 0x8d || type == 0x04);
2833 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2834 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2835 == 0xe8);
2836 BFD_ASSERT (rel + 1 < relend);
2837 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2838 roff = rel->r_offset - 3;
2839 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2840 if (type == 0x04)
2841 {
2842 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2843 Change it into:
2844 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2845 BFD_ASSERT (rel->r_offset >= 3);
2846 BFD_ASSERT (bfd_get_8 (input_bfd,
2847 contents + rel->r_offset - 3)
2848 == 0x8d);
2849 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2850 val >>= 3;
2851 }
2852 else
2853 {
2854 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2855 Change it into:
2856 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2857 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2858 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2859 BFD_ASSERT (bfd_get_8 (input_bfd,
2860 contents + rel->r_offset + 9)
2861 == 0x90);
2862 roff = rel->r_offset - 2;
2863 }
2864 memcpy (contents + roff,
2865 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2866 contents[roff + 7] = 0x80 | (val & 7);
2867 /* If foo is used only with foo@gotntpoff(%reg) and
2868 foo@indntpoff, but not with foo@gottpoff(%reg), change
2869 subl $foo@gottpoff(%reg), %eax
2870 into:
2871 addl $foo@gotntpoff(%reg), %eax. */
2872 if (r_type == R_386_TLS_GOTIE)
2873 {
2874 contents[roff + 6] = 0x03;
2875 if (tls_type == GOT_TLS_IE_BOTH)
2876 off += 4;
2877 }
2878 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2879 contents + roff + 8);
2880 /* Skip R_386_PLT32. */
2881 rel++;
2882 continue;
2883 }
2884 break;
2885
2886 case R_386_TLS_LDM:
2887 if (! info->shared)
2888 {
2889 unsigned int val;
2890
2891 /* LD->LE transition:
2892 Ensure it is:
2893 leal foo(%reg), %eax; call ___tls_get_addr.
2894 We change it into:
2895 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2896 BFD_ASSERT (rel->r_offset >= 2);
2897 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2898 == 0x8d);
2899 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2900 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2901 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2902 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2903 == 0xe8);
2904 BFD_ASSERT (rel + 1 < relend);
2905 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2906 memcpy (contents + rel->r_offset - 2,
2907 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2908 /* Skip R_386_PLT32. */
2909 rel++;
2910 continue;
2911 }
2912
2913 if (htab->sgot == NULL)
2914 abort ();
2915
2916 off = htab->tls_ldm_got.offset;
2917 if (off & 1)
2918 off &= ~1;
2919 else
2920 {
2921 Elf_Internal_Rela outrel;
2922 bfd_byte *loc;
2923
2924 if (htab->srelgot == NULL)
2925 abort ();
2926
2927 outrel.r_offset = (htab->sgot->output_section->vma
2928 + htab->sgot->output_offset + off);
2929
2930 bfd_put_32 (output_bfd, 0,
2931 htab->sgot->contents + off);
2932 bfd_put_32 (output_bfd, 0,
2933 htab->sgot->contents + off + 4);
2934 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2935 loc = htab->srelgot->contents;
2936 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2937 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2938 htab->tls_ldm_got.offset |= 1;
2939 }
2940 relocation = htab->sgot->output_offset + off;
2941 unresolved_reloc = FALSE;
2942 break;
2943
2944 case R_386_TLS_LDO_32:
2945 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2946 relocation -= dtpoff_base (info);
2947 else
2948 /* When converting LDO to LE, we must negate. */
2949 relocation = -tpoff (info, relocation);
2950 break;
2951
2952 case R_386_TLS_LE_32:
2953 case R_386_TLS_LE:
2954 if (info->shared)
2955 {
2956 Elf_Internal_Rela outrel;
2957 asection *sreloc;
2958 bfd_byte *loc;
2959 int indx;
2960
2961 outrel.r_offset = rel->r_offset
2962 + input_section->output_section->vma
2963 + input_section->output_offset;
2964 if (h != NULL && h->dynindx != -1)
2965 indx = h->dynindx;
2966 else
2967 indx = 0;
2968 if (r_type == R_386_TLS_LE_32)
2969 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2970 else
2971 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2972 sreloc = elf_section_data (input_section)->sreloc;
2973 if (sreloc == NULL)
2974 abort ();
2975 loc = sreloc->contents;
2976 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2977 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2978 if (indx)
2979 continue;
2980 else if (r_type == R_386_TLS_LE_32)
2981 relocation = dtpoff_base (info) - relocation;
2982 else
2983 relocation -= dtpoff_base (info);
2984 }
2985 else if (r_type == R_386_TLS_LE_32)
2986 relocation = tpoff (info, relocation);
2987 else
2988 relocation = -tpoff (info, relocation);
2989 break;
2990
2991 default:
2992 break;
2993 }
2994
2995 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2996 because such sections are not SEC_ALLOC and thus ld.so will
2997 not process them. */
2998 if (unresolved_reloc
2999 && !((input_section->flags & SEC_DEBUGGING) != 0
3000 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
3001 {
3002 (*_bfd_error_handler)
3003 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
3004 bfd_archive_filename (input_bfd),
3005 bfd_get_section_name (input_bfd, input_section),
3006 (long) rel->r_offset,
3007 h->root.root.string);
3008 return FALSE;
3009 }
3010
3011 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3012 contents, rel->r_offset,
3013 relocation, (bfd_vma) 0);
3014
3015 if (r != bfd_reloc_ok)
3016 {
3017 const char *name;
3018
3019 if (h != NULL)
3020 name = h->root.root.string;
3021 else
3022 {
3023 name = bfd_elf_string_from_elf_section (input_bfd,
3024 symtab_hdr->sh_link,
3025 sym->st_name);
3026 if (name == NULL)
3027 return FALSE;
3028 if (*name == '\0')
3029 name = bfd_section_name (input_bfd, sec);
3030 }
3031
3032 if (r == bfd_reloc_overflow)
3033 {
3034 if (! ((*info->callbacks->reloc_overflow)
3035 (info, name, howto->name, (bfd_vma) 0,
3036 input_bfd, input_section, rel->r_offset)))
3037 return FALSE;
3038 }
3039 else
3040 {
3041 (*_bfd_error_handler)
3042 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3043 bfd_archive_filename (input_bfd),
3044 bfd_get_section_name (input_bfd, input_section),
3045 (long) rel->r_offset, name, (int) r);
3046 return FALSE;
3047 }
3048 }
3049 }
3050
3051 return TRUE;
3052 }
3053
3054 /* Finish up dynamic symbol handling. We set the contents of various
3055 dynamic sections here. */
3056
3057 static bfd_boolean
3058 elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym)
3059 bfd *output_bfd;
3060 struct bfd_link_info *info;
3061 struct elf_link_hash_entry *h;
3062 Elf_Internal_Sym *sym;
3063 {
3064 struct elf_i386_link_hash_table *htab;
3065
3066 htab = elf_i386_hash_table (info);
3067
3068 if (h->plt.offset != (bfd_vma) -1)
3069 {
3070 bfd_vma plt_index;
3071 bfd_vma got_offset;
3072 Elf_Internal_Rela rel;
3073 bfd_byte *loc;
3074
3075 /* This symbol has an entry in the procedure linkage table. Set
3076 it up. */
3077
3078 if (h->dynindx == -1
3079 || htab->splt == NULL
3080 || htab->sgotplt == NULL
3081 || htab->srelplt == NULL)
3082 abort ();
3083
3084 /* Get the index in the procedure linkage table which
3085 corresponds to this symbol. This is the index of this symbol
3086 in all the symbols for which we are making plt entries. The
3087 first entry in the procedure linkage table is reserved. */
3088 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3089
3090 /* Get the offset into the .got table of the entry that
3091 corresponds to this function. Each .got entry is 4 bytes.
3092 The first three are reserved. */
3093 got_offset = (plt_index + 3) * 4;
3094
3095 /* Fill in the entry in the procedure linkage table. */
3096 if (! info->shared)
3097 {
3098 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3099 PLT_ENTRY_SIZE);
3100 bfd_put_32 (output_bfd,
3101 (htab->sgotplt->output_section->vma
3102 + htab->sgotplt->output_offset
3103 + got_offset),
3104 htab->splt->contents + h->plt.offset + 2);
3105 }
3106 else
3107 {
3108 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3109 PLT_ENTRY_SIZE);
3110 bfd_put_32 (output_bfd, got_offset,
3111 htab->splt->contents + h->plt.offset + 2);
3112 }
3113
3114 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3115 htab->splt->contents + h->plt.offset + 7);
3116 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3117 htab->splt->contents + h->plt.offset + 12);
3118
3119 /* Fill in the entry in the global offset table. */
3120 bfd_put_32 (output_bfd,
3121 (htab->splt->output_section->vma
3122 + htab->splt->output_offset
3123 + h->plt.offset
3124 + 6),
3125 htab->sgotplt->contents + got_offset);
3126
3127 /* Fill in the entry in the .rel.plt section. */
3128 rel.r_offset = (htab->sgotplt->output_section->vma
3129 + htab->sgotplt->output_offset
3130 + got_offset);
3131 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3132 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3133 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3134
3135 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3136 {
3137 /* Mark the symbol as undefined, rather than as defined in
3138 the .plt section. Leave the value alone. This is a clue
3139 for the dynamic linker, to make function pointer
3140 comparisons work between an application and shared
3141 library. */
3142 sym->st_shndx = SHN_UNDEF;
3143 }
3144 }
3145
3146 if (h->got.offset != (bfd_vma) -1
3147 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3148 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3149 {
3150 Elf_Internal_Rela rel;
3151 bfd_byte *loc;
3152
3153 /* This symbol has an entry in the global offset table. Set it
3154 up. */
3155
3156 if (htab->sgot == NULL || htab->srelgot == NULL)
3157 abort ();
3158
3159 rel.r_offset = (htab->sgot->output_section->vma
3160 + htab->sgot->output_offset
3161 + (h->got.offset & ~(bfd_vma) 1));
3162
3163 /* If this is a static link, or it is a -Bsymbolic link and the
3164 symbol is defined locally or was forced to be local because
3165 of a version file, we just want to emit a RELATIVE reloc.
3166 The entry in the global offset table will already have been
3167 initialized in the relocate_section function. */
3168 if (info->shared
3169 && SYMBOL_REFERENCES_LOCAL (info, h))
3170 {
3171 BFD_ASSERT((h->got.offset & 1) != 0);
3172 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3173 }
3174 else
3175 {
3176 BFD_ASSERT((h->got.offset & 1) == 0);
3177 bfd_put_32 (output_bfd, (bfd_vma) 0,
3178 htab->sgot->contents + h->got.offset);
3179 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3180 }
3181
3182 loc = htab->srelgot->contents;
3183 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3184 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3185 }
3186
3187 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3188 {
3189 Elf_Internal_Rela rel;
3190 bfd_byte *loc;
3191
3192 /* This symbol needs a copy reloc. Set it up. */
3193
3194 if (h->dynindx == -1
3195 || (h->root.type != bfd_link_hash_defined
3196 && h->root.type != bfd_link_hash_defweak)
3197 || htab->srelbss == NULL)
3198 abort ();
3199
3200 rel.r_offset = (h->root.u.def.value
3201 + h->root.u.def.section->output_section->vma
3202 + h->root.u.def.section->output_offset);
3203 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3204 loc = htab->srelbss->contents;
3205 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3206 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3207 }
3208
3209 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3210 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3211 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3212 sym->st_shndx = SHN_ABS;
3213
3214 return TRUE;
3215 }
3216
3217 /* Used to decide how to sort relocs in an optimal manner for the
3218 dynamic linker, before writing them out. */
3219
3220 static enum elf_reloc_type_class
3221 elf_i386_reloc_type_class (rela)
3222 const Elf_Internal_Rela *rela;
3223 {
3224 switch ((int) ELF32_R_TYPE (rela->r_info))
3225 {
3226 case R_386_RELATIVE:
3227 return reloc_class_relative;
3228 case R_386_JUMP_SLOT:
3229 return reloc_class_plt;
3230 case R_386_COPY:
3231 return reloc_class_copy;
3232 default:
3233 return reloc_class_normal;
3234 }
3235 }
3236
3237 /* Finish up the dynamic sections. */
3238
3239 static bfd_boolean
3240 elf_i386_finish_dynamic_sections (output_bfd, info)
3241 bfd *output_bfd;
3242 struct bfd_link_info *info;
3243 {
3244 struct elf_i386_link_hash_table *htab;
3245 bfd *dynobj;
3246 asection *sdyn;
3247
3248 htab = elf_i386_hash_table (info);
3249 dynobj = htab->elf.dynobj;
3250 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3251
3252 if (htab->elf.dynamic_sections_created)
3253 {
3254 Elf32_External_Dyn *dyncon, *dynconend;
3255
3256 if (sdyn == NULL || htab->sgot == NULL)
3257 abort ();
3258
3259 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3260 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3261 for (; dyncon < dynconend; dyncon++)
3262 {
3263 Elf_Internal_Dyn dyn;
3264 asection *s;
3265
3266 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3267
3268 switch (dyn.d_tag)
3269 {
3270 default:
3271 continue;
3272
3273 case DT_PLTGOT:
3274 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3275 break;
3276
3277 case DT_JMPREL:
3278 s = htab->srelplt;
3279 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3280 break;
3281
3282 case DT_PLTRELSZ:
3283 s = htab->srelplt;
3284 dyn.d_un.d_val = s->_raw_size;
3285 break;
3286
3287 case DT_RELSZ:
3288 /* My reading of the SVR4 ABI indicates that the
3289 procedure linkage table relocs (DT_JMPREL) should be
3290 included in the overall relocs (DT_REL). This is
3291 what Solaris does. However, UnixWare can not handle
3292 that case. Therefore, we override the DT_RELSZ entry
3293 here to make it not include the JMPREL relocs. */
3294 s = htab->srelplt;
3295 if (s == NULL)
3296 continue;
3297 dyn.d_un.d_val -= s->_raw_size;
3298 break;
3299
3300 case DT_REL:
3301 /* We may not be using the standard ELF linker script.
3302 If .rel.plt is the first .rel section, we adjust
3303 DT_REL to not include it. */
3304 s = htab->srelplt;
3305 if (s == NULL)
3306 continue;
3307 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3308 continue;
3309 dyn.d_un.d_ptr += s->_raw_size;
3310 break;
3311 }
3312
3313 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3314 }
3315
3316 /* Fill in the first entry in the procedure linkage table. */
3317 if (htab->splt && htab->splt->_raw_size > 0)
3318 {
3319 if (info->shared)
3320 memcpy (htab->splt->contents,
3321 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3322 else
3323 {
3324 memcpy (htab->splt->contents,
3325 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3326 bfd_put_32 (output_bfd,
3327 (htab->sgotplt->output_section->vma
3328 + htab->sgotplt->output_offset
3329 + 4),
3330 htab->splt->contents + 2);
3331 bfd_put_32 (output_bfd,
3332 (htab->sgotplt->output_section->vma
3333 + htab->sgotplt->output_offset
3334 + 8),
3335 htab->splt->contents + 8);
3336 }
3337
3338 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3339 really seem like the right value. */
3340 elf_section_data (htab->splt->output_section)
3341 ->this_hdr.sh_entsize = 4;
3342 }
3343 }
3344
3345 if (htab->sgotplt)
3346 {
3347 /* Fill in the first three entries in the global offset table. */
3348 if (htab->sgotplt->_raw_size > 0)
3349 {
3350 bfd_put_32 (output_bfd,
3351 (sdyn == NULL ? (bfd_vma) 0
3352 : sdyn->output_section->vma + sdyn->output_offset),
3353 htab->sgotplt->contents);
3354 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3355 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3356 }
3357
3358 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3359 }
3360 return TRUE;
3361 }
3362
3363 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3364 #define TARGET_LITTLE_NAME "elf32-i386"
3365 #define ELF_ARCH bfd_arch_i386
3366 #define ELF_MACHINE_CODE EM_386
3367 #define ELF_MAXPAGESIZE 0x1000
3368
3369 #define elf_backend_can_gc_sections 1
3370 #define elf_backend_can_refcount 1
3371 #define elf_backend_want_got_plt 1
3372 #define elf_backend_plt_readonly 1
3373 #define elf_backend_want_plt_sym 0
3374 #define elf_backend_got_header_size 12
3375 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3376
3377 /* Support RELA for objdump of prelink objects. */
3378 #define elf_info_to_howto elf_i386_info_to_howto_rel
3379 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3380
3381 #define bfd_elf32_mkobject elf_i386_mkobject
3382 #define elf_backend_object_p elf_i386_object_p
3383
3384 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3385 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3386 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3387
3388 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3389 #define elf_backend_check_relocs elf_i386_check_relocs
3390 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3391 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3392 #define elf_backend_fake_sections elf_i386_fake_sections
3393 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3394 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3395 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3396 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3397 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3398 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3399 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3400 #define elf_backend_relocate_section elf_i386_relocate_section
3401 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3402
3403 #include "elf32-target.h"
3404
3405 /* FreeBSD support. */
3406
3407 #undef TARGET_LITTLE_SYM
3408 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3409 #undef TARGET_LITTLE_NAME
3410 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3411
3412 /* The kernel recognizes executables as valid only if they carry a
3413 "FreeBSD" label in the ELF header. So we put this label on all
3414 executables and (for simplicity) also all other object files. */
3415
3416 static void elf_i386_post_process_headers
3417 PARAMS ((bfd *, struct bfd_link_info *));
3418
3419 static void
3420 elf_i386_post_process_headers (abfd, link_info)
3421 bfd *abfd;
3422 struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3423 {
3424 Elf_Internal_Ehdr *i_ehdrp;
3425
3426 i_ehdrp = elf_elfheader (abfd);
3427
3428 /* Put an ABI label supported by FreeBSD >= 4.1. */
3429 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3430 #ifdef OLD_FREEBSD_ABI_LABEL
3431 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3432 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3433 #endif
3434 }
3435
3436 #undef elf_backend_post_process_headers
3437 #define elf_backend_post_process_headers elf_i386_post_process_headers
3438 #undef elf32_bed
3439 #define elf32_bed elf32_i386_fbsd_bed
3440
3441 #include "elf32-target.h"
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