projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Make bfd.link_next field a union
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2014 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32
33 /* 386 uses REL relocations instead of RELA. */
34 #define USE_REL 1
35
36 #include "elf/i386.h"
37
38 static reloc_howto_type elf_howto_table[]=
39 {
40 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
73
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
112
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
135 bfd_elf_generic_reloc, "R_386_SIZE32",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_VTABLE_INHERIT:
336 TRACE ("BFD_RELOC_VTABLE_INHERIT");
337 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
338
339 case BFD_RELOC_VTABLE_ENTRY:
340 TRACE ("BFD_RELOC_VTABLE_ENTRY");
341 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
342
343 default:
344 break;
345 }
346
347 TRACE ("Unknown");
348 return 0;
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_irelative - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
376 >= R_386_vt - R_386_irelative))
377 {
378 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
379 abfd, (int) r_type);
380 indx = R_386_NONE;
381 }
382 BFD_ASSERT (elf_howto_table [indx].type == r_type);
383 return &elf_howto_table[indx];
384 }
385
386 static void
387 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
388 arelent *cache_ptr,
389 Elf_Internal_Rela *dst)
390 {
391 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
392 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
393 }
394
395 /* Return whether a symbol name implies a local label. The UnixWare
396 2.1 cc generates temporary symbols that start with .X, so we
397 recognize them here. FIXME: do other SVR4 compilers also use .X?.
398 If so, we should move the .X recognition into
399 _bfd_elf_is_local_label_name. */
400
401 static bfd_boolean
402 elf_i386_is_local_label_name (bfd *abfd, const char *name)
403 {
404 if (name[0] == '.' && name[1] == 'X')
405 return TRUE;
406
407 return _bfd_elf_is_local_label_name (abfd, name);
408 }
409 \f
410 /* Support for core dump NOTE sections. */
411
412 static bfd_boolean
413 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
414 {
415 int offset;
416 size_t size;
417
418 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
419 {
420 int pr_version = bfd_get_32 (abfd, note->descdata);
421
422 if (pr_version != 1)
423 return FALSE;
424
425 /* pr_cursig */
426 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
427
428 /* pr_pid */
429 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
430
431 /* pr_reg */
432 offset = 28;
433 size = bfd_get_32 (abfd, note->descdata + 8);
434 }
435 else
436 {
437 switch (note->descsz)
438 {
439 default:
440 return FALSE;
441
442 case 144: /* Linux/i386 */
443 /* pr_cursig */
444 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
445
446 /* pr_pid */
447 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
448
449 /* pr_reg */
450 offset = 72;
451 size = 68;
452
453 break;
454 }
455 }
456
457 /* Make a ".reg/999" section. */
458 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
459 size, note->descpos + offset);
460 }
461
462 static bfd_boolean
463 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
464 {
465 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
466 {
467 int pr_version = bfd_get_32 (abfd, note->descdata);
468
469 if (pr_version != 1)
470 return FALSE;
471
472 elf_tdata (abfd)->core->program
473 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
474 elf_tdata (abfd)->core->command
475 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
476 }
477 else
478 {
479 switch (note->descsz)
480 {
481 default:
482 return FALSE;
483
484 case 124: /* Linux/i386 elf_prpsinfo. */
485 elf_tdata (abfd)->core->pid
486 = bfd_get_32 (abfd, note->descdata + 12);
487 elf_tdata (abfd)->core->program
488 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
489 elf_tdata (abfd)->core->command
490 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
491 }
492 }
493
494 /* Note that for some reason, a spurious space is tacked
495 onto the end of the args in some (at least one anyway)
496 implementations, so strip it off if it exists. */
497 {
498 char *command = elf_tdata (abfd)->core->command;
499 int n = strlen (command);
500
501 if (0 < n && command[n - 1] == ' ')
502 command[n - 1] = '\0';
503 }
504
505 return TRUE;
506 }
507 \f
508 /* Functions for the i386 ELF linker.
509
510 In order to gain some understanding of code in this file without
511 knowing all the intricate details of the linker, note the
512 following:
513
514 Functions named elf_i386_* are called by external routines, other
515 functions are only called locally. elf_i386_* functions appear
516 in this file more or less in the order in which they are called
517 from external routines. eg. elf_i386_check_relocs is called
518 early in the link process, elf_i386_finish_dynamic_sections is
519 one of the last functions. */
520
521
522 /* The name of the dynamic interpreter. This is put in the .interp
523 section. */
524
525 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
526
527 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
528 copying dynamic variables from a shared lib into an app's dynbss
529 section, and instead use a dynamic relocation to point into the
530 shared lib. */
531 #define ELIMINATE_COPY_RELOCS 1
532
533 /* The size in bytes of an entry in the procedure linkage table. */
534
535 #define PLT_ENTRY_SIZE 16
536
537 /* The first entry in an absolute procedure linkage table looks like
538 this. See the SVR4 ABI i386 supplement to see how this works.
539 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
540
541 static const bfd_byte elf_i386_plt0_entry[12] =
542 {
543 0xff, 0x35, /* pushl contents of address */
544 0, 0, 0, 0, /* replaced with address of .got + 4. */
545 0xff, 0x25, /* jmp indirect */
546 0, 0, 0, 0 /* replaced with address of .got + 8. */
547 };
548
549 /* Subsequent entries in an absolute procedure linkage table look like
550 this. */
551
552 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
553 {
554 0xff, 0x25, /* jmp indirect */
555 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
556 0x68, /* pushl immediate */
557 0, 0, 0, 0, /* replaced with offset into relocation table. */
558 0xe9, /* jmp relative */
559 0, 0, 0, 0 /* replaced with offset to start of .plt. */
560 };
561
562 /* The first entry in a PIC procedure linkage table look like this.
563 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
564
565 static const bfd_byte elf_i386_pic_plt0_entry[12] =
566 {
567 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
568 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
569 };
570
571 /* Subsequent entries in a PIC procedure linkage table look like this. */
572
573 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
574 {
575 0xff, 0xa3, /* jmp *offset(%ebx) */
576 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
577 0x68, /* pushl immediate */
578 0, 0, 0, 0, /* replaced with offset into relocation table. */
579 0xe9, /* jmp relative */
580 0, 0, 0, 0 /* replaced with offset to start of .plt. */
581 };
582
583 /* .eh_frame covering the .plt section. */
584
585 static const bfd_byte elf_i386_eh_frame_plt[] =
586 {
587 #define PLT_CIE_LENGTH 20
588 #define PLT_FDE_LENGTH 36
589 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
590 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
591 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
592 0, 0, 0, 0, /* CIE ID */
593 1, /* CIE version */
594 'z', 'R', 0, /* Augmentation string */
595 1, /* Code alignment factor */
596 0x7c, /* Data alignment factor */
597 8, /* Return address column */
598 1, /* Augmentation size */
599 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
600 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
601 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
602 DW_CFA_nop, DW_CFA_nop,
603
604 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
605 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
606 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
607 0, 0, 0, 0, /* .plt size goes here */
608 0, /* Augmentation size */
609 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
610 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
611 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
612 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
613 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
614 11, /* Block length */
615 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
616 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
617 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
618 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
619 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
620 };
621
622 struct elf_i386_plt_layout
623 {
624 /* The first entry in an absolute procedure linkage table looks like this. */
625 const bfd_byte *plt0_entry;
626 unsigned int plt0_entry_size;
627
628 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
629 unsigned int plt0_got1_offset;
630 unsigned int plt0_got2_offset;
631
632 /* Later entries in an absolute procedure linkage table look like this. */
633 const bfd_byte *plt_entry;
634 unsigned int plt_entry_size;
635
636 /* Offsets into plt_entry that are to be replaced with... */
637 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
638 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
639 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
640
641 /* Offset into plt_entry where the initial value of the GOT entry points. */
642 unsigned int plt_lazy_offset;
643
644 /* The first entry in a PIC procedure linkage table looks like this. */
645 const bfd_byte *pic_plt0_entry;
646
647 /* Subsequent entries in a PIC procedure linkage table look like this. */
648 const bfd_byte *pic_plt_entry;
649
650 /* .eh_frame covering the .plt section. */
651 const bfd_byte *eh_frame_plt;
652 unsigned int eh_frame_plt_size;
653 };
654
655 #define GET_PLT_ENTRY_SIZE(abfd) \
656 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
657
658 /* These are the standard parameters. */
659 static const struct elf_i386_plt_layout elf_i386_plt =
660 {
661 elf_i386_plt0_entry, /* plt0_entry */
662 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
663 2, /* plt0_got1_offset */
664 8, /* plt0_got2_offset */
665 elf_i386_plt_entry, /* plt_entry */
666 PLT_ENTRY_SIZE, /* plt_entry_size */
667 2, /* plt_got_offset */
668 7, /* plt_reloc_offset */
669 12, /* plt_plt_offset */
670 6, /* plt_lazy_offset */
671 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
672 elf_i386_pic_plt_entry, /* pic_plt_entry */
673 elf_i386_eh_frame_plt, /* eh_frame_plt */
674 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
675 };
676 \f
677
678 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
679 for the PLTResolve stub and then for each PLT entry. */
680 #define PLTRESOLVE_RELOCS_SHLIB 0
681 #define PLTRESOLVE_RELOCS 2
682 #define PLT_NON_JUMP_SLOT_RELOCS 2
683
684 /* Architecture-specific backend data for i386. */
685
686 struct elf_i386_backend_data
687 {
688 /* Parameters describing PLT generation. */
689 const struct elf_i386_plt_layout *plt;
690
691 /* Value used to fill the unused bytes of the first PLT entry. */
692 bfd_byte plt0_pad_byte;
693
694 /* True if the target system is VxWorks. */
695 int is_vxworks;
696 };
697
698 #define get_elf_i386_backend_data(abfd) \
699 ((const struct elf_i386_backend_data *) \
700 get_elf_backend_data (abfd)->arch_data)
701
702 /* These are the standard parameters. */
703 static const struct elf_i386_backend_data elf_i386_arch_bed =
704 {
705 &elf_i386_plt, /* plt */
706 0, /* plt0_pad_byte */
707 0, /* is_vxworks */
708 };
709
710 #define elf_backend_arch_data &elf_i386_arch_bed
711
712 /* i386 ELF linker hash entry. */
713
714 struct elf_i386_link_hash_entry
715 {
716 struct elf_link_hash_entry elf;
717
718 /* Track dynamic relocs copied for this symbol. */
719 struct elf_dyn_relocs *dyn_relocs;
720
721 #define GOT_UNKNOWN 0
722 #define GOT_NORMAL 1
723 #define GOT_TLS_GD 2
724 #define GOT_TLS_IE 4
725 #define GOT_TLS_IE_POS 5
726 #define GOT_TLS_IE_NEG 6
727 #define GOT_TLS_IE_BOTH 7
728 #define GOT_TLS_GDESC 8
729 #define GOT_TLS_GD_BOTH_P(type) \
730 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
731 #define GOT_TLS_GD_P(type) \
732 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
733 #define GOT_TLS_GDESC_P(type) \
734 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
735 #define GOT_TLS_GD_ANY_P(type) \
736 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
737 unsigned char tls_type;
738
739 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
740 starting at the end of the jump table. */
741 bfd_vma tlsdesc_got;
742 };
743
744 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
745
746 struct elf_i386_obj_tdata
747 {
748 struct elf_obj_tdata root;
749
750 /* tls_type for each local got entry. */
751 char *local_got_tls_type;
752
753 /* GOTPLT entries for TLS descriptors. */
754 bfd_vma *local_tlsdesc_gotent;
755 };
756
757 #define elf_i386_tdata(abfd) \
758 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
759
760 #define elf_i386_local_got_tls_type(abfd) \
761 (elf_i386_tdata (abfd)->local_got_tls_type)
762
763 #define elf_i386_local_tlsdesc_gotent(abfd) \
764 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
765
766 #define is_i386_elf(bfd) \
767 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
768 && elf_tdata (bfd) != NULL \
769 && elf_object_id (bfd) == I386_ELF_DATA)
770
771 static bfd_boolean
772 elf_i386_mkobject (bfd *abfd)
773 {
774 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
775 I386_ELF_DATA);
776 }
777
778 /* i386 ELF linker hash table. */
779
780 struct elf_i386_link_hash_table
781 {
782 struct elf_link_hash_table elf;
783
784 /* Short-cuts to get to dynamic linker sections. */
785 asection *sdynbss;
786 asection *srelbss;
787 asection *plt_eh_frame;
788
789 union
790 {
791 bfd_signed_vma refcount;
792 bfd_vma offset;
793 } tls_ldm_got;
794
795 /* The amount of space used by the reserved portion of the sgotplt
796 section, plus whatever space is used by the jump slots. */
797 bfd_vma sgotplt_jump_table_size;
798
799 /* Small local sym cache. */
800 struct sym_cache sym_cache;
801
802 /* _TLS_MODULE_BASE_ symbol. */
803 struct bfd_link_hash_entry *tls_module_base;
804
805 /* Used by local STT_GNU_IFUNC symbols. */
806 htab_t loc_hash_table;
807 void * loc_hash_memory;
808
809 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
810 asection *srelplt2;
811
812 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
813 bfd_vma next_tls_desc_index;
814
815 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
816 bfd_vma next_jump_slot_index;
817
818 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
819 bfd_vma next_irelative_index;
820 };
821
822 /* Get the i386 ELF linker hash table from a link_info structure. */
823
824 #define elf_i386_hash_table(p) \
825 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
826 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
827
828 #define elf_i386_compute_jump_table_size(htab) \
829 ((htab)->next_tls_desc_index * 4)
830
831 /* Create an entry in an i386 ELF linker hash table. */
832
833 static struct bfd_hash_entry *
834 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
835 struct bfd_hash_table *table,
836 const char *string)
837 {
838 /* Allocate the structure if it has not already been allocated by a
839 subclass. */
840 if (entry == NULL)
841 {
842 entry = (struct bfd_hash_entry *)
843 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
844 if (entry == NULL)
845 return entry;
846 }
847
848 /* Call the allocation method of the superclass. */
849 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
850 if (entry != NULL)
851 {
852 struct elf_i386_link_hash_entry *eh;
853
854 eh = (struct elf_i386_link_hash_entry *) entry;
855 eh->dyn_relocs = NULL;
856 eh->tls_type = GOT_UNKNOWN;
857 eh->tlsdesc_got = (bfd_vma) -1;
858 }
859
860 return entry;
861 }
862
863 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
864 for local symbol so that we can handle local STT_GNU_IFUNC symbols
865 as global symbol. We reuse indx and dynstr_index for local symbol
866 hash since they aren't used by global symbols in this backend. */
867
868 static hashval_t
869 elf_i386_local_htab_hash (const void *ptr)
870 {
871 struct elf_link_hash_entry *h
872 = (struct elf_link_hash_entry *) ptr;
873 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
874 }
875
876 /* Compare local hash entries. */
877
878 static int
879 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
880 {
881 struct elf_link_hash_entry *h1
882 = (struct elf_link_hash_entry *) ptr1;
883 struct elf_link_hash_entry *h2
884 = (struct elf_link_hash_entry *) ptr2;
885
886 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
887 }
888
889 /* Find and/or create a hash entry for local symbol. */
890
891 static struct elf_link_hash_entry *
892 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
893 bfd *abfd, const Elf_Internal_Rela *rel,
894 bfd_boolean create)
895 {
896 struct elf_i386_link_hash_entry e, *ret;
897 asection *sec = abfd->sections;
898 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
899 ELF32_R_SYM (rel->r_info));
900 void **slot;
901
902 e.elf.indx = sec->id;
903 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
904 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
905 create ? INSERT : NO_INSERT);
906
907 if (!slot)
908 return NULL;
909
910 if (*slot)
911 {
912 ret = (struct elf_i386_link_hash_entry *) *slot;
913 return &ret->elf;
914 }
915
916 ret = (struct elf_i386_link_hash_entry *)
917 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
918 sizeof (struct elf_i386_link_hash_entry));
919 if (ret)
920 {
921 memset (ret, 0, sizeof (*ret));
922 ret->elf.indx = sec->id;
923 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
924 ret->elf.dynindx = -1;
925 *slot = ret;
926 }
927 return &ret->elf;
928 }
929
930 /* Create an i386 ELF linker hash table. */
931
932 static struct bfd_link_hash_table *
933 elf_i386_link_hash_table_create (bfd *abfd)
934 {
935 struct elf_i386_link_hash_table *ret;
936 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
937
938 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
939 if (ret == NULL)
940 return NULL;
941
942 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
943 elf_i386_link_hash_newfunc,
944 sizeof (struct elf_i386_link_hash_entry),
945 I386_ELF_DATA))
946 {
947 free (ret);
948 return NULL;
949 }
950
951 ret->loc_hash_table = htab_try_create (1024,
952 elf_i386_local_htab_hash,
953 elf_i386_local_htab_eq,
954 NULL);
955 ret->loc_hash_memory = objalloc_create ();
956 if (!ret->loc_hash_table || !ret->loc_hash_memory)
957 {
958 free (ret);
959 return NULL;
960 }
961
962 return &ret->elf.root;
963 }
964
965 /* Destroy an i386 ELF linker hash table. */
966
967 static void
968 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
969 {
970 struct elf_i386_link_hash_table *htab
971 = (struct elf_i386_link_hash_table *) hash;
972
973 if (htab->loc_hash_table)
974 htab_delete (htab->loc_hash_table);
975 if (htab->loc_hash_memory)
976 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
977 _bfd_elf_link_hash_table_free (hash);
978 }
979
980 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
981 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
982 hash table. */
983
984 static bfd_boolean
985 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
986 {
987 struct elf_i386_link_hash_table *htab;
988
989 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
990 return FALSE;
991
992 htab = elf_i386_hash_table (info);
993 if (htab == NULL)
994 return FALSE;
995
996 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
997 if (!info->shared)
998 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
999
1000 if (!htab->sdynbss
1001 || (!info->shared && !htab->srelbss))
1002 abort ();
1003
1004 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1005 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1006 &htab->srelplt2))
1007 return FALSE;
1008
1009 if (!info->no_ld_generated_unwind_info
1010 && htab->plt_eh_frame == NULL
1011 && htab->elf.splt != NULL)
1012 {
1013 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1014 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1015 | SEC_LINKER_CREATED);
1016 htab->plt_eh_frame
1017 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1018 if (htab->plt_eh_frame == NULL
1019 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1020 return FALSE;
1021 }
1022
1023 return TRUE;
1024 }
1025
1026 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1027
1028 static void
1029 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1030 struct elf_link_hash_entry *dir,
1031 struct elf_link_hash_entry *ind)
1032 {
1033 struct elf_i386_link_hash_entry *edir, *eind;
1034
1035 edir = (struct elf_i386_link_hash_entry *) dir;
1036 eind = (struct elf_i386_link_hash_entry *) ind;
1037
1038 if (eind->dyn_relocs != NULL)
1039 {
1040 if (edir->dyn_relocs != NULL)
1041 {
1042 struct elf_dyn_relocs **pp;
1043 struct elf_dyn_relocs *p;
1044
1045 /* Add reloc counts against the indirect sym to the direct sym
1046 list. Merge any entries against the same section. */
1047 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1048 {
1049 struct elf_dyn_relocs *q;
1050
1051 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1052 if (q->sec == p->sec)
1053 {
1054 q->pc_count += p->pc_count;
1055 q->count += p->count;
1056 *pp = p->next;
1057 break;
1058 }
1059 if (q == NULL)
1060 pp = &p->next;
1061 }
1062 *pp = edir->dyn_relocs;
1063 }
1064
1065 edir->dyn_relocs = eind->dyn_relocs;
1066 eind->dyn_relocs = NULL;
1067 }
1068
1069 if (ind->root.type == bfd_link_hash_indirect
1070 && dir->got.refcount <= 0)
1071 {
1072 edir->tls_type = eind->tls_type;
1073 eind->tls_type = GOT_UNKNOWN;
1074 }
1075
1076 if (ELIMINATE_COPY_RELOCS
1077 && ind->root.type != bfd_link_hash_indirect
1078 && dir->dynamic_adjusted)
1079 {
1080 /* If called to transfer flags for a weakdef during processing
1081 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1082 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1083 dir->ref_dynamic |= ind->ref_dynamic;
1084 dir->ref_regular |= ind->ref_regular;
1085 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1086 dir->needs_plt |= ind->needs_plt;
1087 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1088 }
1089 else
1090 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1091 }
1092
1093 /* Return TRUE if the TLS access code sequence support transition
1094 from R_TYPE. */
1095
1096 static bfd_boolean
1097 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1098 bfd_byte *contents,
1099 Elf_Internal_Shdr *symtab_hdr,
1100 struct elf_link_hash_entry **sym_hashes,
1101 unsigned int r_type,
1102 const Elf_Internal_Rela *rel,
1103 const Elf_Internal_Rela *relend)
1104 {
1105 unsigned int val, type;
1106 unsigned long r_symndx;
1107 struct elf_link_hash_entry *h;
1108 bfd_vma offset;
1109
1110 /* Get the section contents. */
1111 if (contents == NULL)
1112 {
1113 if (elf_section_data (sec)->this_hdr.contents != NULL)
1114 contents = elf_section_data (sec)->this_hdr.contents;
1115 else
1116 {
1117 /* FIXME: How to better handle error condition? */
1118 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1119 return FALSE;
1120
1121 /* Cache the section contents for elf_link_input_bfd. */
1122 elf_section_data (sec)->this_hdr.contents = contents;
1123 }
1124 }
1125
1126 offset = rel->r_offset;
1127 switch (r_type)
1128 {
1129 case R_386_TLS_GD:
1130 case R_386_TLS_LDM:
1131 if (offset < 2 || (rel + 1) >= relend)
1132 return FALSE;
1133
1134 type = bfd_get_8 (abfd, contents + offset - 2);
1135 if (r_type == R_386_TLS_GD)
1136 {
1137 /* Check transition from GD access model. Only
1138 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1139 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1140 can transit to different access model. */
1141 if ((offset + 10) > sec->size ||
1142 (type != 0x8d && type != 0x04))
1143 return FALSE;
1144
1145 val = bfd_get_8 (abfd, contents + offset - 1);
1146 if (type == 0x04)
1147 {
1148 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1149 if (offset < 3)
1150 return FALSE;
1151
1152 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1153 return FALSE;
1154
1155 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1156 return FALSE;
1157 }
1158 else
1159 {
1160 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1161 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1162 return FALSE;
1163
1164 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1165 return FALSE;
1166 }
1167 }
1168 else
1169 {
1170 /* Check transition from LD access model. Only
1171 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1172 can transit to different access model. */
1173 if (type != 0x8d || (offset + 9) > sec->size)
1174 return FALSE;
1175
1176 val = bfd_get_8 (abfd, contents + offset - 1);
1177 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1178 return FALSE;
1179 }
1180
1181 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1182 return FALSE;
1183
1184 r_symndx = ELF32_R_SYM (rel[1].r_info);
1185 if (r_symndx < symtab_hdr->sh_info)
1186 return FALSE;
1187
1188 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1189 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1190 may be versioned. */
1191 return (h != NULL
1192 && h->root.root.string != NULL
1193 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1194 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1195 && (strncmp (h->root.root.string, "___tls_get_addr",
1196 15) == 0));
1197
1198 case R_386_TLS_IE:
1199 /* Check transition from IE access model:
1200 movl foo@indntpoff(%rip), %eax
1201 movl foo@indntpoff(%rip), %reg
1202 addl foo@indntpoff(%rip), %reg
1203 */
1204
1205 if (offset < 1 || (offset + 4) > sec->size)
1206 return FALSE;
1207
1208 /* Check "movl foo@tpoff(%rip), %eax" first. */
1209 val = bfd_get_8 (abfd, contents + offset - 1);
1210 if (val == 0xa1)
1211 return TRUE;
1212
1213 if (offset < 2)
1214 return FALSE;
1215
1216 /* Check movl|addl foo@tpoff(%rip), %reg. */
1217 type = bfd_get_8 (abfd, contents + offset - 2);
1218 return ((type == 0x8b || type == 0x03)
1219 && (val & 0xc7) == 0x05);
1220
1221 case R_386_TLS_GOTIE:
1222 case R_386_TLS_IE_32:
1223 /* Check transition from {IE_32,GOTIE} access model:
1224 subl foo@{tpoff,gontoff}(%reg1), %reg2
1225 movl foo@{tpoff,gontoff}(%reg1), %reg2
1226 addl foo@{tpoff,gontoff}(%reg1), %reg2
1227 */
1228
1229 if (offset < 2 || (offset + 4) > sec->size)
1230 return FALSE;
1231
1232 val = bfd_get_8 (abfd, contents + offset - 1);
1233 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1234 return FALSE;
1235
1236 type = bfd_get_8 (abfd, contents + offset - 2);
1237 return type == 0x8b || type == 0x2b || type == 0x03;
1238
1239 case R_386_TLS_GOTDESC:
1240 /* Check transition from GDesc access model:
1241 leal x@tlsdesc(%ebx), %eax
1242
1243 Make sure it's a leal adding ebx to a 32-bit offset
1244 into any register, although it's probably almost always
1245 going to be eax. */
1246
1247 if (offset < 2 || (offset + 4) > sec->size)
1248 return FALSE;
1249
1250 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1251 return FALSE;
1252
1253 val = bfd_get_8 (abfd, contents + offset - 1);
1254 return (val & 0xc7) == 0x83;
1255
1256 case R_386_TLS_DESC_CALL:
1257 /* Check transition from GDesc access model:
1258 call *x@tlsdesc(%rax)
1259 */
1260 if (offset + 2 <= sec->size)
1261 {
1262 /* Make sure that it's a call *x@tlsdesc(%rax). */
1263 static const unsigned char call[] = { 0xff, 0x10 };
1264 return memcmp (contents + offset, call, 2) == 0;
1265 }
1266
1267 return FALSE;
1268
1269 default:
1270 abort ();
1271 }
1272 }
1273
1274 /* Return TRUE if the TLS access transition is OK or no transition
1275 will be performed. Update R_TYPE if there is a transition. */
1276
1277 static bfd_boolean
1278 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1279 asection *sec, bfd_byte *contents,
1280 Elf_Internal_Shdr *symtab_hdr,
1281 struct elf_link_hash_entry **sym_hashes,
1282 unsigned int *r_type, int tls_type,
1283 const Elf_Internal_Rela *rel,
1284 const Elf_Internal_Rela *relend,
1285 struct elf_link_hash_entry *h,
1286 unsigned long r_symndx)
1287 {
1288 unsigned int from_type = *r_type;
1289 unsigned int to_type = from_type;
1290 bfd_boolean check = TRUE;
1291
1292 /* Skip TLS transition for functions. */
1293 if (h != NULL
1294 && (h->type == STT_FUNC
1295 || h->type == STT_GNU_IFUNC))
1296 return TRUE;
1297
1298 switch (from_type)
1299 {
1300 case R_386_TLS_GD:
1301 case R_386_TLS_GOTDESC:
1302 case R_386_TLS_DESC_CALL:
1303 case R_386_TLS_IE_32:
1304 case R_386_TLS_IE:
1305 case R_386_TLS_GOTIE:
1306 if (info->executable)
1307 {
1308 if (h == NULL)
1309 to_type = R_386_TLS_LE_32;
1310 else if (from_type != R_386_TLS_IE
1311 && from_type != R_386_TLS_GOTIE)
1312 to_type = R_386_TLS_IE_32;
1313 }
1314
1315 /* When we are called from elf_i386_relocate_section, CONTENTS
1316 isn't NULL and there may be additional transitions based on
1317 TLS_TYPE. */
1318 if (contents != NULL)
1319 {
1320 unsigned int new_to_type = to_type;
1321
1322 if (info->executable
1323 && h != NULL
1324 && h->dynindx == -1
1325 && (tls_type & GOT_TLS_IE))
1326 new_to_type = R_386_TLS_LE_32;
1327
1328 if (to_type == R_386_TLS_GD
1329 || to_type == R_386_TLS_GOTDESC
1330 || to_type == R_386_TLS_DESC_CALL)
1331 {
1332 if (tls_type == GOT_TLS_IE_POS)
1333 new_to_type = R_386_TLS_GOTIE;
1334 else if (tls_type & GOT_TLS_IE)
1335 new_to_type = R_386_TLS_IE_32;
1336 }
1337
1338 /* We checked the transition before when we were called from
1339 elf_i386_check_relocs. We only want to check the new
1340 transition which hasn't been checked before. */
1341 check = new_to_type != to_type && from_type == to_type;
1342 to_type = new_to_type;
1343 }
1344
1345 break;
1346
1347 case R_386_TLS_LDM:
1348 if (info->executable)
1349 to_type = R_386_TLS_LE_32;
1350 break;
1351
1352 default:
1353 return TRUE;
1354 }
1355
1356 /* Return TRUE if there is no transition. */
1357 if (from_type == to_type)
1358 return TRUE;
1359
1360 /* Check if the transition can be performed. */
1361 if (check
1362 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1363 symtab_hdr, sym_hashes,
1364 from_type, rel, relend))
1365 {
1366 reloc_howto_type *from, *to;
1367 const char *name;
1368
1369 from = elf_i386_rtype_to_howto (abfd, from_type);
1370 to = elf_i386_rtype_to_howto (abfd, to_type);
1371
1372 if (h)
1373 name = h->root.root.string;
1374 else
1375 {
1376 struct elf_i386_link_hash_table *htab;
1377
1378 htab = elf_i386_hash_table (info);
1379 if (htab == NULL)
1380 name = "*unknown*";
1381 else
1382 {
1383 Elf_Internal_Sym *isym;
1384
1385 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1386 abfd, r_symndx);
1387 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1388 }
1389 }
1390
1391 (*_bfd_error_handler)
1392 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1393 "in section `%A' failed"),
1394 abfd, sec, from->name, to->name, name,
1395 (unsigned long) rel->r_offset);
1396 bfd_set_error (bfd_error_bad_value);
1397 return FALSE;
1398 }
1399
1400 *r_type = to_type;
1401 return TRUE;
1402 }
1403
1404 /* Look through the relocs for a section during the first phase, and
1405 calculate needed space in the global offset table, procedure linkage
1406 table, and dynamic reloc sections. */
1407
1408 static bfd_boolean
1409 elf_i386_check_relocs (bfd *abfd,
1410 struct bfd_link_info *info,
1411 asection *sec,
1412 const Elf_Internal_Rela *relocs)
1413 {
1414 struct elf_i386_link_hash_table *htab;
1415 Elf_Internal_Shdr *symtab_hdr;
1416 struct elf_link_hash_entry **sym_hashes;
1417 const Elf_Internal_Rela *rel;
1418 const Elf_Internal_Rela *rel_end;
1419 asection *sreloc;
1420
1421 if (info->relocatable)
1422 return TRUE;
1423
1424 BFD_ASSERT (is_i386_elf (abfd));
1425
1426 htab = elf_i386_hash_table (info);
1427 if (htab == NULL)
1428 return FALSE;
1429
1430 symtab_hdr = &elf_symtab_hdr (abfd);
1431 sym_hashes = elf_sym_hashes (abfd);
1432
1433 sreloc = NULL;
1434
1435 rel_end = relocs + sec->reloc_count;
1436 for (rel = relocs; rel < rel_end; rel++)
1437 {
1438 unsigned int r_type;
1439 unsigned long r_symndx;
1440 struct elf_link_hash_entry *h;
1441 Elf_Internal_Sym *isym;
1442 const char *name;
1443 bfd_boolean size_reloc;
1444
1445 r_symndx = ELF32_R_SYM (rel->r_info);
1446 r_type = ELF32_R_TYPE (rel->r_info);
1447
1448 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1449 {
1450 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1451 abfd,
1452 r_symndx);
1453 return FALSE;
1454 }
1455
1456 if (r_symndx < symtab_hdr->sh_info)
1457 {
1458 /* A local symbol. */
1459 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1460 abfd, r_symndx);
1461 if (isym == NULL)
1462 return FALSE;
1463
1464 /* Check relocation against local STT_GNU_IFUNC symbol. */
1465 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1466 {
1467 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1468 if (h == NULL)
1469 return FALSE;
1470
1471 /* Fake a STT_GNU_IFUNC symbol. */
1472 h->type = STT_GNU_IFUNC;
1473 h->def_regular = 1;
1474 h->ref_regular = 1;
1475 h->forced_local = 1;
1476 h->root.type = bfd_link_hash_defined;
1477 }
1478 else
1479 h = NULL;
1480 }
1481 else
1482 {
1483 isym = NULL;
1484 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1485 while (h->root.type == bfd_link_hash_indirect
1486 || h->root.type == bfd_link_hash_warning)
1487 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1488 }
1489
1490 if (h != NULL)
1491 {
1492 /* Create the ifunc sections for static executables. If we
1493 never see an indirect function symbol nor we are building
1494 a static executable, those sections will be empty and
1495 won't appear in output. */
1496 switch (r_type)
1497 {
1498 default:
1499 break;
1500
1501 case R_386_32:
1502 case R_386_PC32:
1503 case R_386_PLT32:
1504 case R_386_GOT32:
1505 case R_386_GOTOFF:
1506 if (htab->elf.dynobj == NULL)
1507 htab->elf.dynobj = abfd;
1508 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1509 return FALSE;
1510 break;
1511 }
1512
1513 /* It is referenced by a non-shared object. */
1514 h->ref_regular = 1;
1515 h->root.non_ir_ref = 1;
1516 }
1517
1518 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1519 symtab_hdr, sym_hashes,
1520 &r_type, GOT_UNKNOWN,
1521 rel, rel_end, h, r_symndx))
1522 return FALSE;
1523
1524 switch (r_type)
1525 {
1526 case R_386_TLS_LDM:
1527 htab->tls_ldm_got.refcount += 1;
1528 goto create_got;
1529
1530 case R_386_PLT32:
1531 /* This symbol requires a procedure linkage table entry. We
1532 actually build the entry in adjust_dynamic_symbol,
1533 because this might be a case of linking PIC code which is
1534 never referenced by a dynamic object, in which case we
1535 don't need to generate a procedure linkage table entry
1536 after all. */
1537
1538 /* If this is a local symbol, we resolve it directly without
1539 creating a procedure linkage table entry. */
1540 if (h == NULL)
1541 continue;
1542
1543 h->needs_plt = 1;
1544 h->plt.refcount += 1;
1545 break;
1546
1547 case R_386_SIZE32:
1548 size_reloc = TRUE;
1549 goto do_size;
1550
1551 case R_386_TLS_IE_32:
1552 case R_386_TLS_IE:
1553 case R_386_TLS_GOTIE:
1554 if (!info->executable)
1555 info->flags |= DF_STATIC_TLS;
1556 /* Fall through */
1557
1558 case R_386_GOT32:
1559 case R_386_TLS_GD:
1560 case R_386_TLS_GOTDESC:
1561 case R_386_TLS_DESC_CALL:
1562 /* This symbol requires a global offset table entry. */
1563 {
1564 int tls_type, old_tls_type;
1565
1566 switch (r_type)
1567 {
1568 default:
1569 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1570 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1571 case R_386_TLS_GOTDESC:
1572 case R_386_TLS_DESC_CALL:
1573 tls_type = GOT_TLS_GDESC; break;
1574 case R_386_TLS_IE_32:
1575 if (ELF32_R_TYPE (rel->r_info) == r_type)
1576 tls_type = GOT_TLS_IE_NEG;
1577 else
1578 /* If this is a GD->IE transition, we may use either of
1579 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1580 tls_type = GOT_TLS_IE;
1581 break;
1582 case R_386_TLS_IE:
1583 case R_386_TLS_GOTIE:
1584 tls_type = GOT_TLS_IE_POS; break;
1585 }
1586
1587 if (h != NULL)
1588 {
1589 h->got.refcount += 1;
1590 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1591 }
1592 else
1593 {
1594 bfd_signed_vma *local_got_refcounts;
1595
1596 /* This is a global offset table entry for a local symbol. */
1597 local_got_refcounts = elf_local_got_refcounts (abfd);
1598 if (local_got_refcounts == NULL)
1599 {
1600 bfd_size_type size;
1601
1602 size = symtab_hdr->sh_info;
1603 size *= (sizeof (bfd_signed_vma)
1604 + sizeof (bfd_vma) + sizeof(char));
1605 local_got_refcounts = (bfd_signed_vma *)
1606 bfd_zalloc (abfd, size);
1607 if (local_got_refcounts == NULL)
1608 return FALSE;
1609 elf_local_got_refcounts (abfd) = local_got_refcounts;
1610 elf_i386_local_tlsdesc_gotent (abfd)
1611 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1612 elf_i386_local_got_tls_type (abfd)
1613 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1614 }
1615 local_got_refcounts[r_symndx] += 1;
1616 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1617 }
1618
1619 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1620 tls_type |= old_tls_type;
1621 /* If a TLS symbol is accessed using IE at least once,
1622 there is no point to use dynamic model for it. */
1623 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1624 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1625 || (tls_type & GOT_TLS_IE) == 0))
1626 {
1627 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1628 tls_type = old_tls_type;
1629 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1630 && GOT_TLS_GD_ANY_P (tls_type))
1631 tls_type |= old_tls_type;
1632 else
1633 {
1634 if (h)
1635 name = h->root.root.string;
1636 else
1637 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1638 NULL);
1639 (*_bfd_error_handler)
1640 (_("%B: `%s' accessed both as normal and "
1641 "thread local symbol"),
1642 abfd, name);
1643 bfd_set_error (bfd_error_bad_value);
1644 return FALSE;
1645 }
1646 }
1647
1648 if (old_tls_type != tls_type)
1649 {
1650 if (h != NULL)
1651 elf_i386_hash_entry (h)->tls_type = tls_type;
1652 else
1653 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1654 }
1655 }
1656 /* Fall through */
1657
1658 case R_386_GOTOFF:
1659 case R_386_GOTPC:
1660 create_got:
1661 if (htab->elf.sgot == NULL)
1662 {
1663 if (htab->elf.dynobj == NULL)
1664 htab->elf.dynobj = abfd;
1665 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1666 return FALSE;
1667 }
1668 if (r_type != R_386_TLS_IE)
1669 break;
1670 /* Fall through */
1671
1672 case R_386_TLS_LE_32:
1673 case R_386_TLS_LE:
1674 if (info->executable)
1675 break;
1676 info->flags |= DF_STATIC_TLS;
1677 /* Fall through */
1678
1679 case R_386_32:
1680 case R_386_PC32:
1681 if (h != NULL && info->executable)
1682 {
1683 /* If this reloc is in a read-only section, we might
1684 need a copy reloc. We can't check reliably at this
1685 stage whether the section is read-only, as input
1686 sections have not yet been mapped to output sections.
1687 Tentatively set the flag for now, and correct in
1688 adjust_dynamic_symbol. */
1689 h->non_got_ref = 1;
1690
1691 /* We may need a .plt entry if the function this reloc
1692 refers to is in a shared lib. */
1693 h->plt.refcount += 1;
1694 if (r_type != R_386_PC32)
1695 h->pointer_equality_needed = 1;
1696 }
1697
1698 size_reloc = FALSE;
1699 do_size:
1700 /* If we are creating a shared library, and this is a reloc
1701 against a global symbol, or a non PC relative reloc
1702 against a local symbol, then we need to copy the reloc
1703 into the shared library. However, if we are linking with
1704 -Bsymbolic, we do not need to copy a reloc against a
1705 global symbol which is defined in an object we are
1706 including in the link (i.e., DEF_REGULAR is set). At
1707 this point we have not seen all the input files, so it is
1708 possible that DEF_REGULAR is not set now but will be set
1709 later (it is never cleared). In case of a weak definition,
1710 DEF_REGULAR may be cleared later by a strong definition in
1711 a shared library. We account for that possibility below by
1712 storing information in the relocs_copied field of the hash
1713 table entry. A similar situation occurs when creating
1714 shared libraries and symbol visibility changes render the
1715 symbol local.
1716
1717 If on the other hand, we are creating an executable, we
1718 may need to keep relocations for symbols satisfied by a
1719 dynamic library if we manage to avoid copy relocs for the
1720 symbol. */
1721 if ((info->shared
1722 && (sec->flags & SEC_ALLOC) != 0
1723 && (r_type != R_386_PC32
1724 || (h != NULL
1725 && (! SYMBOLIC_BIND (info, h)
1726 || h->root.type == bfd_link_hash_defweak
1727 || !h->def_regular))))
1728 || (ELIMINATE_COPY_RELOCS
1729 && !info->shared
1730 && (sec->flags & SEC_ALLOC) != 0
1731 && h != NULL
1732 && (h->root.type == bfd_link_hash_defweak
1733 || !h->def_regular)))
1734 {
1735 struct elf_dyn_relocs *p;
1736 struct elf_dyn_relocs **head;
1737
1738 /* We must copy these reloc types into the output file.
1739 Create a reloc section in dynobj and make room for
1740 this reloc. */
1741 if (sreloc == NULL)
1742 {
1743 if (htab->elf.dynobj == NULL)
1744 htab->elf.dynobj = abfd;
1745
1746 sreloc = _bfd_elf_make_dynamic_reloc_section
1747 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1748
1749 if (sreloc == NULL)
1750 return FALSE;
1751 }
1752
1753 /* If this is a global symbol, we count the number of
1754 relocations we need for this symbol. */
1755 if (h != NULL)
1756 {
1757 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1758 }
1759 else
1760 {
1761 /* Track dynamic relocs needed for local syms too.
1762 We really need local syms available to do this
1763 easily. Oh well. */
1764 void **vpp;
1765 asection *s;
1766
1767 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1768 abfd, r_symndx);
1769 if (isym == NULL)
1770 return FALSE;
1771
1772 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1773 if (s == NULL)
1774 s = sec;
1775
1776 vpp = &elf_section_data (s)->local_dynrel;
1777 head = (struct elf_dyn_relocs **)vpp;
1778 }
1779
1780 p = *head;
1781 if (p == NULL || p->sec != sec)
1782 {
1783 bfd_size_type amt = sizeof *p;
1784 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1785 amt);
1786 if (p == NULL)
1787 return FALSE;
1788 p->next = *head;
1789 *head = p;
1790 p->sec = sec;
1791 p->count = 0;
1792 p->pc_count = 0;
1793 }
1794
1795 p->count += 1;
1796 /* Count size relocation as PC-relative relocation. */
1797 if (r_type == R_386_PC32 || size_reloc)
1798 p->pc_count += 1;
1799 }
1800 break;
1801
1802 /* This relocation describes the C++ object vtable hierarchy.
1803 Reconstruct it for later use during GC. */
1804 case R_386_GNU_VTINHERIT:
1805 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1806 return FALSE;
1807 break;
1808
1809 /* This relocation describes which C++ vtable entries are actually
1810 used. Record for later use during GC. */
1811 case R_386_GNU_VTENTRY:
1812 BFD_ASSERT (h != NULL);
1813 if (h != NULL
1814 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1815 return FALSE;
1816 break;
1817
1818 default:
1819 break;
1820 }
1821 }
1822
1823 return TRUE;
1824 }
1825
1826 /* Return the section that should be marked against GC for a given
1827 relocation. */
1828
1829 static asection *
1830 elf_i386_gc_mark_hook (asection *sec,
1831 struct bfd_link_info *info,
1832 Elf_Internal_Rela *rel,
1833 struct elf_link_hash_entry *h,
1834 Elf_Internal_Sym *sym)
1835 {
1836 if (h != NULL)
1837 switch (ELF32_R_TYPE (rel->r_info))
1838 {
1839 case R_386_GNU_VTINHERIT:
1840 case R_386_GNU_VTENTRY:
1841 return NULL;
1842 }
1843
1844 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1845 }
1846
1847 /* Update the got entry reference counts for the section being removed. */
1848
1849 static bfd_boolean
1850 elf_i386_gc_sweep_hook (bfd *abfd,
1851 struct bfd_link_info *info,
1852 asection *sec,
1853 const Elf_Internal_Rela *relocs)
1854 {
1855 struct elf_i386_link_hash_table *htab;
1856 Elf_Internal_Shdr *symtab_hdr;
1857 struct elf_link_hash_entry **sym_hashes;
1858 bfd_signed_vma *local_got_refcounts;
1859 const Elf_Internal_Rela *rel, *relend;
1860
1861 if (info->relocatable)
1862 return TRUE;
1863
1864 htab = elf_i386_hash_table (info);
1865 if (htab == NULL)
1866 return FALSE;
1867
1868 elf_section_data (sec)->local_dynrel = NULL;
1869
1870 symtab_hdr = &elf_symtab_hdr (abfd);
1871 sym_hashes = elf_sym_hashes (abfd);
1872 local_got_refcounts = elf_local_got_refcounts (abfd);
1873
1874 relend = relocs + sec->reloc_count;
1875 for (rel = relocs; rel < relend; rel++)
1876 {
1877 unsigned long r_symndx;
1878 unsigned int r_type;
1879 struct elf_link_hash_entry *h = NULL;
1880
1881 r_symndx = ELF32_R_SYM (rel->r_info);
1882 if (r_symndx >= symtab_hdr->sh_info)
1883 {
1884 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1885 while (h->root.type == bfd_link_hash_indirect
1886 || h->root.type == bfd_link_hash_warning)
1887 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1888 }
1889 else
1890 {
1891 /* A local symbol. */
1892 Elf_Internal_Sym *isym;
1893
1894 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1895 abfd, r_symndx);
1896
1897 /* Check relocation against local STT_GNU_IFUNC symbol. */
1898 if (isym != NULL
1899 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1900 {
1901 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1902 if (h == NULL)
1903 abort ();
1904 }
1905 }
1906
1907 if (h)
1908 {
1909 struct elf_i386_link_hash_entry *eh;
1910 struct elf_dyn_relocs **pp;
1911 struct elf_dyn_relocs *p;
1912
1913 eh = (struct elf_i386_link_hash_entry *) h;
1914 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1915 if (p->sec == sec)
1916 {
1917 /* Everything must go for SEC. */
1918 *pp = p->next;
1919 break;
1920 }
1921 }
1922
1923 r_type = ELF32_R_TYPE (rel->r_info);
1924 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1925 symtab_hdr, sym_hashes,
1926 &r_type, GOT_UNKNOWN,
1927 rel, relend, h, r_symndx))
1928 return FALSE;
1929
1930 switch (r_type)
1931 {
1932 case R_386_TLS_LDM:
1933 if (htab->tls_ldm_got.refcount > 0)
1934 htab->tls_ldm_got.refcount -= 1;
1935 break;
1936
1937 case R_386_TLS_GD:
1938 case R_386_TLS_GOTDESC:
1939 case R_386_TLS_DESC_CALL:
1940 case R_386_TLS_IE_32:
1941 case R_386_TLS_IE:
1942 case R_386_TLS_GOTIE:
1943 case R_386_GOT32:
1944 if (h != NULL)
1945 {
1946 if (h->got.refcount > 0)
1947 h->got.refcount -= 1;
1948 if (h->type == STT_GNU_IFUNC)
1949 {
1950 if (h->plt.refcount > 0)
1951 h->plt.refcount -= 1;
1952 }
1953 }
1954 else if (local_got_refcounts != NULL)
1955 {
1956 if (local_got_refcounts[r_symndx] > 0)
1957 local_got_refcounts[r_symndx] -= 1;
1958 }
1959 break;
1960
1961 case R_386_32:
1962 case R_386_PC32:
1963 case R_386_SIZE32:
1964 if (info->shared
1965 && (h == NULL || h->type != STT_GNU_IFUNC))
1966 break;
1967 /* Fall through */
1968
1969 case R_386_PLT32:
1970 if (h != NULL)
1971 {
1972 if (h->plt.refcount > 0)
1973 h->plt.refcount -= 1;
1974 }
1975 break;
1976
1977 case R_386_GOTOFF:
1978 if (h != NULL && h->type == STT_GNU_IFUNC)
1979 {
1980 if (h->got.refcount > 0)
1981 h->got.refcount -= 1;
1982 if (h->plt.refcount > 0)
1983 h->plt.refcount -= 1;
1984 }
1985 break;
1986
1987 default:
1988 break;
1989 }
1990 }
1991
1992 return TRUE;
1993 }
1994
1995 /* Adjust a symbol defined by a dynamic object and referenced by a
1996 regular object. The current definition is in some section of the
1997 dynamic object, but we're not including those sections. We have to
1998 change the definition to something the rest of the link can
1999 understand. */
2000
2001 static bfd_boolean
2002 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2003 struct elf_link_hash_entry *h)
2004 {
2005 struct elf_i386_link_hash_table *htab;
2006 asection *s;
2007 struct elf_i386_link_hash_entry *eh;
2008 struct elf_dyn_relocs *p;
2009
2010 /* STT_GNU_IFUNC symbol must go through PLT. */
2011 if (h->type == STT_GNU_IFUNC)
2012 {
2013 /* All local STT_GNU_IFUNC references must be treate as local
2014 calls via local PLT. */
2015 if (h->ref_regular
2016 && SYMBOL_CALLS_LOCAL (info, h))
2017 {
2018 bfd_size_type pc_count = 0, count = 0;
2019 struct elf_dyn_relocs **pp;
2020
2021 eh = (struct elf_i386_link_hash_entry *) h;
2022 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2023 {
2024 pc_count += p->pc_count;
2025 p->count -= p->pc_count;
2026 p->pc_count = 0;
2027 count += p->count;
2028 if (p->count == 0)
2029 *pp = p->next;
2030 else
2031 pp = &p->next;
2032 }
2033
2034 if (pc_count || count)
2035 {
2036 h->needs_plt = 1;
2037 h->non_got_ref = 1;
2038 if (h->plt.refcount <= 0)
2039 h->plt.refcount = 1;
2040 else
2041 h->plt.refcount += 1;
2042 }
2043 }
2044
2045 if (h->plt.refcount <= 0)
2046 {
2047 h->plt.offset = (bfd_vma) -1;
2048 h->needs_plt = 0;
2049 }
2050 return TRUE;
2051 }
2052
2053 /* If this is a function, put it in the procedure linkage table. We
2054 will fill in the contents of the procedure linkage table later,
2055 when we know the address of the .got section. */
2056 if (h->type == STT_FUNC
2057 || h->needs_plt)
2058 {
2059 if (h->plt.refcount <= 0
2060 || SYMBOL_CALLS_LOCAL (info, h)
2061 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2062 && h->root.type == bfd_link_hash_undefweak))
2063 {
2064 /* This case can occur if we saw a PLT32 reloc in an input
2065 file, but the symbol was never referred to by a dynamic
2066 object, or if all references were garbage collected. In
2067 such a case, we don't actually need to build a procedure
2068 linkage table, and we can just do a PC32 reloc instead. */
2069 h->plt.offset = (bfd_vma) -1;
2070 h->needs_plt = 0;
2071 }
2072
2073 return TRUE;
2074 }
2075 else
2076 /* It's possible that we incorrectly decided a .plt reloc was
2077 needed for an R_386_PC32 reloc to a non-function sym in
2078 check_relocs. We can't decide accurately between function and
2079 non-function syms in check-relocs; Objects loaded later in
2080 the link may change h->type. So fix it now. */
2081 h->plt.offset = (bfd_vma) -1;
2082
2083 /* If this is a weak symbol, and there is a real definition, the
2084 processor independent code will have arranged for us to see the
2085 real definition first, and we can just use the same value. */
2086 if (h->u.weakdef != NULL)
2087 {
2088 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2089 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2090 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2091 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2092 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2093 h->non_got_ref = h->u.weakdef->non_got_ref;
2094 return TRUE;
2095 }
2096
2097 /* This is a reference to a symbol defined by a dynamic object which
2098 is not a function. */
2099
2100 /* If we are creating a shared library, we must presume that the
2101 only references to the symbol are via the global offset table.
2102 For such cases we need not do anything here; the relocations will
2103 be handled correctly by relocate_section. */
2104 if (info->shared)
2105 return TRUE;
2106
2107 /* If there are no references to this symbol that do not use the
2108 GOT, we don't need to generate a copy reloc. */
2109 if (!h->non_got_ref)
2110 return TRUE;
2111
2112 /* If -z nocopyreloc was given, we won't generate them either. */
2113 if (info->nocopyreloc)
2114 {
2115 h->non_got_ref = 0;
2116 return TRUE;
2117 }
2118
2119 htab = elf_i386_hash_table (info);
2120 if (htab == NULL)
2121 return FALSE;
2122
2123 /* If there aren't any dynamic relocs in read-only sections, then
2124 we can keep the dynamic relocs and avoid the copy reloc. This
2125 doesn't work on VxWorks, where we can not have dynamic relocations
2126 (other than copy and jump slot relocations) in an executable. */
2127 if (ELIMINATE_COPY_RELOCS
2128 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2129 {
2130 eh = (struct elf_i386_link_hash_entry *) h;
2131 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2132 {
2133 s = p->sec->output_section;
2134 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2135 break;
2136 }
2137
2138 if (p == NULL)
2139 {
2140 h->non_got_ref = 0;
2141 return TRUE;
2142 }
2143 }
2144
2145 /* We must allocate the symbol in our .dynbss section, which will
2146 become part of the .bss section of the executable. There will be
2147 an entry for this symbol in the .dynsym section. The dynamic
2148 object will contain position independent code, so all references
2149 from the dynamic object to this symbol will go through the global
2150 offset table. The dynamic linker will use the .dynsym entry to
2151 determine the address it must put in the global offset table, so
2152 both the dynamic object and the regular object will refer to the
2153 same memory location for the variable. */
2154
2155 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2156 copy the initial value out of the dynamic object and into the
2157 runtime process image. */
2158 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2159 {
2160 htab->srelbss->size += sizeof (Elf32_External_Rel);
2161 h->needs_copy = 1;
2162 }
2163
2164 s = htab->sdynbss;
2165
2166 return _bfd_elf_adjust_dynamic_copy (h, s);
2167 }
2168
2169 /* Allocate space in .plt, .got and associated reloc sections for
2170 dynamic relocs. */
2171
2172 static bfd_boolean
2173 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2174 {
2175 struct bfd_link_info *info;
2176 struct elf_i386_link_hash_table *htab;
2177 struct elf_i386_link_hash_entry *eh;
2178 struct elf_dyn_relocs *p;
2179 unsigned plt_entry_size;
2180
2181 if (h->root.type == bfd_link_hash_indirect)
2182 return TRUE;
2183
2184 eh = (struct elf_i386_link_hash_entry *) h;
2185
2186 info = (struct bfd_link_info *) inf;
2187 htab = elf_i386_hash_table (info);
2188 if (htab == NULL)
2189 return FALSE;
2190
2191 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2192
2193 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2194 here if it is defined and referenced in a non-shared object. */
2195 if (h->type == STT_GNU_IFUNC
2196 && h->def_regular)
2197 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2198 plt_entry_size,
2199 plt_entry_size, 4);
2200 else if (htab->elf.dynamic_sections_created
2201 && h->plt.refcount > 0)
2202 {
2203 /* Make sure this symbol is output as a dynamic symbol.
2204 Undefined weak syms won't yet be marked as dynamic. */
2205 if (h->dynindx == -1
2206 && !h->forced_local)
2207 {
2208 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2209 return FALSE;
2210 }
2211
2212 if (info->shared
2213 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2214 {
2215 asection *s = htab->elf.splt;
2216
2217 /* If this is the first .plt entry, make room for the special
2218 first entry. */
2219 if (s->size == 0)
2220 s->size = plt_entry_size;
2221
2222 h->plt.offset = s->size;
2223
2224 /* If this symbol is not defined in a regular file, and we are
2225 not generating a shared library, then set the symbol to this
2226 location in the .plt. This is required to make function
2227 pointers compare as equal between the normal executable and
2228 the shared library. */
2229 if (! info->shared
2230 && !h->def_regular)
2231 {
2232 h->root.u.def.section = s;
2233 h->root.u.def.value = h->plt.offset;
2234 }
2235
2236 /* Make room for this entry. */
2237 s->size += plt_entry_size;
2238
2239 /* We also need to make an entry in the .got.plt section, which
2240 will be placed in the .got section by the linker script. */
2241 htab->elf.sgotplt->size += 4;
2242
2243 /* We also need to make an entry in the .rel.plt section. */
2244 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2245 htab->elf.srelplt->reloc_count++;
2246
2247 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2248 && !info->shared)
2249 {
2250 /* VxWorks has a second set of relocations for each PLT entry
2251 in executables. They go in a separate relocation section,
2252 which is processed by the kernel loader. */
2253
2254 /* There are two relocations for the initial PLT entry: an
2255 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2256 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2257
2258 if (h->plt.offset == plt_entry_size)
2259 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2260
2261 /* There are two extra relocations for each subsequent PLT entry:
2262 an R_386_32 relocation for the GOT entry, and an R_386_32
2263 relocation for the PLT entry. */
2264
2265 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2266 }
2267 }
2268 else
2269 {
2270 h->plt.offset = (bfd_vma) -1;
2271 h->needs_plt = 0;
2272 }
2273 }
2274 else
2275 {
2276 h->plt.offset = (bfd_vma) -1;
2277 h->needs_plt = 0;
2278 }
2279
2280 eh->tlsdesc_got = (bfd_vma) -1;
2281
2282 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2283 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2284 if (h->got.refcount > 0
2285 && info->executable
2286 && h->dynindx == -1
2287 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2288 h->got.offset = (bfd_vma) -1;
2289 else if (h->got.refcount > 0)
2290 {
2291 asection *s;
2292 bfd_boolean dyn;
2293 int tls_type = elf_i386_hash_entry(h)->tls_type;
2294
2295 /* Make sure this symbol is output as a dynamic symbol.
2296 Undefined weak syms won't yet be marked as dynamic. */
2297 if (h->dynindx == -1
2298 && !h->forced_local)
2299 {
2300 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2301 return FALSE;
2302 }
2303
2304 s = htab->elf.sgot;
2305 if (GOT_TLS_GDESC_P (tls_type))
2306 {
2307 eh->tlsdesc_got = htab->elf.sgotplt->size
2308 - elf_i386_compute_jump_table_size (htab);
2309 htab->elf.sgotplt->size += 8;
2310 h->got.offset = (bfd_vma) -2;
2311 }
2312 if (! GOT_TLS_GDESC_P (tls_type)
2313 || GOT_TLS_GD_P (tls_type))
2314 {
2315 h->got.offset = s->size;
2316 s->size += 4;
2317 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2318 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2319 s->size += 4;
2320 }
2321 dyn = htab->elf.dynamic_sections_created;
2322 /* R_386_TLS_IE_32 needs one dynamic relocation,
2323 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2324 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2325 need two), R_386_TLS_GD needs one if local symbol and two if
2326 global. */
2327 if (tls_type == GOT_TLS_IE_BOTH)
2328 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2329 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2330 || (tls_type & GOT_TLS_IE))
2331 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2332 else if (GOT_TLS_GD_P (tls_type))
2333 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2334 else if (! GOT_TLS_GDESC_P (tls_type)
2335 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2336 || h->root.type != bfd_link_hash_undefweak)
2337 && (info->shared
2338 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2339 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2340 if (GOT_TLS_GDESC_P (tls_type))
2341 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2342 }
2343 else
2344 h->got.offset = (bfd_vma) -1;
2345
2346 if (eh->dyn_relocs == NULL)
2347 return TRUE;
2348
2349 /* In the shared -Bsymbolic case, discard space allocated for
2350 dynamic pc-relative relocs against symbols which turn out to be
2351 defined in regular objects. For the normal shared case, discard
2352 space for pc-relative relocs that have become local due to symbol
2353 visibility changes. */
2354
2355 if (info->shared)
2356 {
2357 /* The only reloc that uses pc_count is R_386_PC32, which will
2358 appear on a call or on something like ".long foo - .". We
2359 want calls to protected symbols to resolve directly to the
2360 function rather than going via the plt. If people want
2361 function pointer comparisons to work as expected then they
2362 should avoid writing assembly like ".long foo - .". */
2363 if (SYMBOL_CALLS_LOCAL (info, h))
2364 {
2365 struct elf_dyn_relocs **pp;
2366
2367 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2368 {
2369 p->count -= p->pc_count;
2370 p->pc_count = 0;
2371 if (p->count == 0)
2372 *pp = p->next;
2373 else
2374 pp = &p->next;
2375 }
2376 }
2377
2378 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2379 {
2380 struct elf_dyn_relocs **pp;
2381 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2382 {
2383 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2384 *pp = p->next;
2385 else
2386 pp = &p->next;
2387 }
2388 }
2389
2390 /* Also discard relocs on undefined weak syms with non-default
2391 visibility. */
2392 if (eh->dyn_relocs != NULL
2393 && h->root.type == bfd_link_hash_undefweak)
2394 {
2395 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2396 eh->dyn_relocs = NULL;
2397
2398 /* Make sure undefined weak symbols are output as a dynamic
2399 symbol in PIEs. */
2400 else if (h->dynindx == -1
2401 && !h->forced_local)
2402 {
2403 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2404 return FALSE;
2405 }
2406 }
2407 }
2408 else if (ELIMINATE_COPY_RELOCS)
2409 {
2410 /* For the non-shared case, discard space for relocs against
2411 symbols which turn out to need copy relocs or are not
2412 dynamic. */
2413
2414 if (!h->non_got_ref
2415 && ((h->def_dynamic
2416 && !h->def_regular)
2417 || (htab->elf.dynamic_sections_created
2418 && (h->root.type == bfd_link_hash_undefweak
2419 || h->root.type == bfd_link_hash_undefined))))
2420 {
2421 /* Make sure this symbol is output as a dynamic symbol.
2422 Undefined weak syms won't yet be marked as dynamic. */
2423 if (h->dynindx == -1
2424 && !h->forced_local)
2425 {
2426 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2427 return FALSE;
2428 }
2429
2430 /* If that succeeded, we know we'll be keeping all the
2431 relocs. */
2432 if (h->dynindx != -1)
2433 goto keep;
2434 }
2435
2436 eh->dyn_relocs = NULL;
2437
2438 keep: ;
2439 }
2440
2441 /* Finally, allocate space. */
2442 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2443 {
2444 asection *sreloc;
2445
2446 sreloc = elf_section_data (p->sec)->sreloc;
2447
2448 BFD_ASSERT (sreloc != NULL);
2449 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2450 }
2451
2452 return TRUE;
2453 }
2454
2455 /* Allocate space in .plt, .got and associated reloc sections for
2456 local dynamic relocs. */
2457
2458 static bfd_boolean
2459 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2460 {
2461 struct elf_link_hash_entry *h
2462 = (struct elf_link_hash_entry *) *slot;
2463
2464 if (h->type != STT_GNU_IFUNC
2465 || !h->def_regular
2466 || !h->ref_regular
2467 || !h->forced_local
2468 || h->root.type != bfd_link_hash_defined)
2469 abort ();
2470
2471 return elf_i386_allocate_dynrelocs (h, inf);
2472 }
2473
2474 /* Find any dynamic relocs that apply to read-only sections. */
2475
2476 static bfd_boolean
2477 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2478 {
2479 struct elf_i386_link_hash_entry *eh;
2480 struct elf_dyn_relocs *p;
2481
2482 /* Skip local IFUNC symbols. */
2483 if (h->forced_local && h->type == STT_GNU_IFUNC)
2484 return TRUE;
2485
2486 eh = (struct elf_i386_link_hash_entry *) h;
2487 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2488 {
2489 asection *s = p->sec->output_section;
2490
2491 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2492 {
2493 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2494
2495 info->flags |= DF_TEXTREL;
2496
2497 if (info->warn_shared_textrel && info->shared)
2498 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2499 p->sec->owner, h->root.root.string,
2500 p->sec);
2501
2502 /* Not an error, just cut short the traversal. */
2503 return FALSE;
2504 }
2505 }
2506 return TRUE;
2507 }
2508
2509 /* Convert
2510 mov foo@GOT(%reg), %reg
2511 to
2512 lea foo@GOTOFF(%reg), %reg
2513 with the local symbol, foo. */
2514
2515 static bfd_boolean
2516 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2517 struct bfd_link_info *link_info)
2518 {
2519 Elf_Internal_Shdr *symtab_hdr;
2520 Elf_Internal_Rela *internal_relocs;
2521 Elf_Internal_Rela *irel, *irelend;
2522 bfd_byte *contents;
2523 struct elf_i386_link_hash_table *htab;
2524 bfd_boolean changed_contents;
2525 bfd_boolean changed_relocs;
2526 bfd_signed_vma *local_got_refcounts;
2527
2528 /* Don't even try to convert non-ELF outputs. */
2529 if (!is_elf_hash_table (link_info->hash))
2530 return FALSE;
2531
2532 /* Nothing to do if there are no codes, no relocations or no output. */
2533 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2534 || sec->reloc_count == 0
2535 || discarded_section (sec))
2536 return TRUE;
2537
2538 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2539
2540 /* Load the relocations for this section. */
2541 internal_relocs = (_bfd_elf_link_read_relocs
2542 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2543 link_info->keep_memory));
2544 if (internal_relocs == NULL)
2545 return FALSE;
2546
2547 htab = elf_i386_hash_table (link_info);
2548 changed_contents = FALSE;
2549 changed_relocs = FALSE;
2550 local_got_refcounts = elf_local_got_refcounts (abfd);
2551
2552 /* Get the section contents. */
2553 if (elf_section_data (sec)->this_hdr.contents != NULL)
2554 contents = elf_section_data (sec)->this_hdr.contents;
2555 else
2556 {
2557 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2558 goto error_return;
2559 }
2560
2561 irelend = internal_relocs + sec->reloc_count;
2562 for (irel = internal_relocs; irel < irelend; irel++)
2563 {
2564 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2565 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2566 unsigned int indx;
2567 struct elf_link_hash_entry *h;
2568
2569 if (r_type != R_386_GOT32)
2570 continue;
2571
2572 /* Get the symbol referred to by the reloc. */
2573 if (r_symndx < symtab_hdr->sh_info)
2574 {
2575 Elf_Internal_Sym *isym;
2576
2577 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2578 abfd, r_symndx);
2579
2580 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2581 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2582 && bfd_get_8 (input_bfd,
2583 contents + irel->r_offset - 2) == 0x8b)
2584 {
2585 bfd_put_8 (output_bfd, 0x8d,
2586 contents + irel->r_offset - 2);
2587 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2588 if (local_got_refcounts != NULL
2589 && local_got_refcounts[r_symndx] > 0)
2590 local_got_refcounts[r_symndx] -= 1;
2591 changed_contents = TRUE;
2592 changed_relocs = TRUE;
2593 }
2594 continue;
2595 }
2596
2597 indx = r_symndx - symtab_hdr->sh_info;
2598 h = elf_sym_hashes (abfd)[indx];
2599 BFD_ASSERT (h != NULL);
2600
2601 while (h->root.type == bfd_link_hash_indirect
2602 || h->root.type == bfd_link_hash_warning)
2603 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2604
2605 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2606 optimizing _DYNAMIC since ld.so may use its link-time address. */
2607 if (h->def_regular
2608 && h->type != STT_GNU_IFUNC
2609 && h != htab->elf.hdynamic
2610 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2611 && bfd_get_8 (input_bfd,
2612 contents + irel->r_offset - 2) == 0x8b)
2613 {
2614 bfd_put_8 (output_bfd, 0x8d,
2615 contents + irel->r_offset - 2);
2616 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2617 if (h->got.refcount > 0)
2618 h->got.refcount -= 1;
2619 changed_contents = TRUE;
2620 changed_relocs = TRUE;
2621 }
2622 }
2623
2624 if (contents != NULL
2625 && elf_section_data (sec)->this_hdr.contents != contents)
2626 {
2627 if (!changed_contents && !link_info->keep_memory)
2628 free (contents);
2629 else
2630 {
2631 /* Cache the section contents for elf_link_input_bfd. */
2632 elf_section_data (sec)->this_hdr.contents = contents;
2633 }
2634 }
2635
2636 if (elf_section_data (sec)->relocs != internal_relocs)
2637 {
2638 if (!changed_relocs)
2639 free (internal_relocs);
2640 else
2641 elf_section_data (sec)->relocs = internal_relocs;
2642 }
2643
2644 return TRUE;
2645
2646 error_return:
2647 if (contents != NULL
2648 && elf_section_data (sec)->this_hdr.contents != contents)
2649 free (contents);
2650 if (internal_relocs != NULL
2651 && elf_section_data (sec)->relocs != internal_relocs)
2652 free (internal_relocs);
2653 return FALSE;
2654 }
2655
2656 /* Set the sizes of the dynamic sections. */
2657
2658 static bfd_boolean
2659 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2660 {
2661 struct elf_i386_link_hash_table *htab;
2662 bfd *dynobj;
2663 asection *s;
2664 bfd_boolean relocs;
2665 bfd *ibfd;
2666
2667 htab = elf_i386_hash_table (info);
2668 if (htab == NULL)
2669 return FALSE;
2670 dynobj = htab->elf.dynobj;
2671 if (dynobj == NULL)
2672 abort ();
2673
2674 if (htab->elf.dynamic_sections_created)
2675 {
2676 /* Set the contents of the .interp section to the interpreter. */
2677 if (info->executable)
2678 {
2679 s = bfd_get_linker_section (dynobj, ".interp");
2680 if (s == NULL)
2681 abort ();
2682 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2683 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2684 }
2685 }
2686
2687 /* Set up .got offsets for local syms, and space for local dynamic
2688 relocs. */
2689 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2690 {
2691 bfd_signed_vma *local_got;
2692 bfd_signed_vma *end_local_got;
2693 char *local_tls_type;
2694 bfd_vma *local_tlsdesc_gotent;
2695 bfd_size_type locsymcount;
2696 Elf_Internal_Shdr *symtab_hdr;
2697 asection *srel;
2698
2699 if (! is_i386_elf (ibfd))
2700 continue;
2701
2702 for (s = ibfd->sections; s != NULL; s = s->next)
2703 {
2704 struct elf_dyn_relocs *p;
2705
2706 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2707 return FALSE;
2708
2709 for (p = ((struct elf_dyn_relocs *)
2710 elf_section_data (s)->local_dynrel);
2711 p != NULL;
2712 p = p->next)
2713 {
2714 if (!bfd_is_abs_section (p->sec)
2715 && bfd_is_abs_section (p->sec->output_section))
2716 {
2717 /* Input section has been discarded, either because
2718 it is a copy of a linkonce section or due to
2719 linker script /DISCARD/, so we'll be discarding
2720 the relocs too. */
2721 }
2722 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2723 && strcmp (p->sec->output_section->name,
2724 ".tls_vars") == 0)
2725 {
2726 /* Relocations in vxworks .tls_vars sections are
2727 handled specially by the loader. */
2728 }
2729 else if (p->count != 0)
2730 {
2731 srel = elf_section_data (p->sec)->sreloc;
2732 srel->size += p->count * sizeof (Elf32_External_Rel);
2733 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2734 && (info->flags & DF_TEXTREL) == 0)
2735 {
2736 info->flags |= DF_TEXTREL;
2737 if (info->warn_shared_textrel && info->shared)
2738 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2739 p->sec->owner, p->sec);
2740 }
2741 }
2742 }
2743 }
2744
2745 local_got = elf_local_got_refcounts (ibfd);
2746 if (!local_got)
2747 continue;
2748
2749 symtab_hdr = &elf_symtab_hdr (ibfd);
2750 locsymcount = symtab_hdr->sh_info;
2751 end_local_got = local_got + locsymcount;
2752 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2753 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2754 s = htab->elf.sgot;
2755 srel = htab->elf.srelgot;
2756 for (; local_got < end_local_got;
2757 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2758 {
2759 *local_tlsdesc_gotent = (bfd_vma) -1;
2760 if (*local_got > 0)
2761 {
2762 if (GOT_TLS_GDESC_P (*local_tls_type))
2763 {
2764 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2765 - elf_i386_compute_jump_table_size (htab);
2766 htab->elf.sgotplt->size += 8;
2767 *local_got = (bfd_vma) -2;
2768 }
2769 if (! GOT_TLS_GDESC_P (*local_tls_type)
2770 || GOT_TLS_GD_P (*local_tls_type))
2771 {
2772 *local_got = s->size;
2773 s->size += 4;
2774 if (GOT_TLS_GD_P (*local_tls_type)
2775 || *local_tls_type == GOT_TLS_IE_BOTH)
2776 s->size += 4;
2777 }
2778 if (info->shared
2779 || GOT_TLS_GD_ANY_P (*local_tls_type)
2780 || (*local_tls_type & GOT_TLS_IE))
2781 {
2782 if (*local_tls_type == GOT_TLS_IE_BOTH)
2783 srel->size += 2 * sizeof (Elf32_External_Rel);
2784 else if (GOT_TLS_GD_P (*local_tls_type)
2785 || ! GOT_TLS_GDESC_P (*local_tls_type))
2786 srel->size += sizeof (Elf32_External_Rel);
2787 if (GOT_TLS_GDESC_P (*local_tls_type))
2788 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2789 }
2790 }
2791 else
2792 *local_got = (bfd_vma) -1;
2793 }
2794 }
2795
2796 if (htab->tls_ldm_got.refcount > 0)
2797 {
2798 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2799 relocs. */
2800 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2801 htab->elf.sgot->size += 8;
2802 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2803 }
2804 else
2805 htab->tls_ldm_got.offset = -1;
2806
2807 /* Allocate global sym .plt and .got entries, and space for global
2808 sym dynamic relocs. */
2809 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2810
2811 /* Allocate .plt and .got entries, and space for local symbols. */
2812 htab_traverse (htab->loc_hash_table,
2813 elf_i386_allocate_local_dynrelocs,
2814 info);
2815
2816 /* For every jump slot reserved in the sgotplt, reloc_count is
2817 incremented. However, when we reserve space for TLS descriptors,
2818 it's not incremented, so in order to compute the space reserved
2819 for them, it suffices to multiply the reloc count by the jump
2820 slot size.
2821
2822 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2823 so that R_386_IRELATIVE entries come last. */
2824 if (htab->elf.srelplt)
2825 {
2826 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2827 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2828 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2829 }
2830 else if (htab->elf.irelplt)
2831 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2832
2833
2834 if (htab->elf.sgotplt)
2835 {
2836 /* Don't allocate .got.plt section if there are no GOT nor PLT
2837 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2838 if ((htab->elf.hgot == NULL
2839 || !htab->elf.hgot->ref_regular_nonweak)
2840 && (htab->elf.sgotplt->size
2841 == get_elf_backend_data (output_bfd)->got_header_size)
2842 && (htab->elf.splt == NULL
2843 || htab->elf.splt->size == 0)
2844 && (htab->elf.sgot == NULL
2845 || htab->elf.sgot->size == 0)
2846 && (htab->elf.iplt == NULL
2847 || htab->elf.iplt->size == 0)
2848 && (htab->elf.igotplt == NULL
2849 || htab->elf.igotplt->size == 0))
2850 htab->elf.sgotplt->size = 0;
2851 }
2852
2853
2854 if (htab->plt_eh_frame != NULL
2855 && htab->elf.splt != NULL
2856 && htab->elf.splt->size != 0
2857 && !bfd_is_abs_section (htab->elf.splt->output_section)
2858 && _bfd_elf_eh_frame_present (info))
2859 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2860
2861 /* We now have determined the sizes of the various dynamic sections.
2862 Allocate memory for them. */
2863 relocs = FALSE;
2864 for (s = dynobj->sections; s != NULL; s = s->next)
2865 {
2866 bfd_boolean strip_section = TRUE;
2867
2868 if ((s->flags & SEC_LINKER_CREATED) == 0)
2869 continue;
2870
2871 if (s == htab->elf.splt
2872 || s == htab->elf.sgot)
2873 {
2874 /* Strip this section if we don't need it; see the
2875 comment below. */
2876 /* We'd like to strip these sections if they aren't needed, but if
2877 we've exported dynamic symbols from them we must leave them.
2878 It's too late to tell BFD to get rid of the symbols. */
2879
2880 if (htab->elf.hplt != NULL)
2881 strip_section = FALSE;
2882 }
2883 else if (s == htab->elf.sgotplt
2884 || s == htab->elf.iplt
2885 || s == htab->elf.igotplt
2886 || s == htab->plt_eh_frame
2887 || s == htab->sdynbss)
2888 {
2889 /* Strip these too. */
2890 }
2891 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2892 {
2893 if (s->size != 0
2894 && s != htab->elf.srelplt
2895 && s != htab->srelplt2)
2896 relocs = TRUE;
2897
2898 /* We use the reloc_count field as a counter if we need
2899 to copy relocs into the output file. */
2900 s->reloc_count = 0;
2901 }
2902 else
2903 {
2904 /* It's not one of our sections, so don't allocate space. */
2905 continue;
2906 }
2907
2908 if (s->size == 0)
2909 {
2910 /* If we don't need this section, strip it from the
2911 output file. This is mostly to handle .rel.bss and
2912 .rel.plt. We must create both sections in
2913 create_dynamic_sections, because they must be created
2914 before the linker maps input sections to output
2915 sections. The linker does that before
2916 adjust_dynamic_symbol is called, and it is that
2917 function which decides whether anything needs to go
2918 into these sections. */
2919 if (strip_section)
2920 s->flags |= SEC_EXCLUDE;
2921 continue;
2922 }
2923
2924 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2925 continue;
2926
2927 /* Allocate memory for the section contents. We use bfd_zalloc
2928 here in case unused entries are not reclaimed before the
2929 section's contents are written out. This should not happen,
2930 but this way if it does, we get a R_386_NONE reloc instead
2931 of garbage. */
2932 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2933 if (s->contents == NULL)
2934 return FALSE;
2935 }
2936
2937 if (htab->plt_eh_frame != NULL
2938 && htab->plt_eh_frame->contents != NULL)
2939 {
2940 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2941 sizeof (elf_i386_eh_frame_plt));
2942 bfd_put_32 (dynobj, htab->elf.splt->size,
2943 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2944 }
2945
2946 if (htab->elf.dynamic_sections_created)
2947 {
2948 /* Add some entries to the .dynamic section. We fill in the
2949 values later, in elf_i386_finish_dynamic_sections, but we
2950 must add the entries now so that we get the correct size for
2951 the .dynamic section. The DT_DEBUG entry is filled in by the
2952 dynamic linker and used by the debugger. */
2953 #define add_dynamic_entry(TAG, VAL) \
2954 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2955
2956 if (info->executable)
2957 {
2958 if (!add_dynamic_entry (DT_DEBUG, 0))
2959 return FALSE;
2960 }
2961
2962 if (htab->elf.splt->size != 0)
2963 {
2964 if (!add_dynamic_entry (DT_PLTGOT, 0)
2965 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2966 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2967 || !add_dynamic_entry (DT_JMPREL, 0))
2968 return FALSE;
2969 }
2970
2971 if (relocs)
2972 {
2973 if (!add_dynamic_entry (DT_REL, 0)
2974 || !add_dynamic_entry (DT_RELSZ, 0)
2975 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2976 return FALSE;
2977
2978 /* If any dynamic relocs apply to a read-only section,
2979 then we need a DT_TEXTREL entry. */
2980 if ((info->flags & DF_TEXTREL) == 0)
2981 elf_link_hash_traverse (&htab->elf,
2982 elf_i386_readonly_dynrelocs, info);
2983
2984 if ((info->flags & DF_TEXTREL) != 0)
2985 {
2986 if (!add_dynamic_entry (DT_TEXTREL, 0))
2987 return FALSE;
2988 }
2989 }
2990 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2991 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2992 return FALSE;
2993 }
2994 #undef add_dynamic_entry
2995
2996 return TRUE;
2997 }
2998
2999 static bfd_boolean
3000 elf_i386_always_size_sections (bfd *output_bfd,
3001 struct bfd_link_info *info)
3002 {
3003 asection *tls_sec = elf_hash_table (info)->tls_sec;
3004
3005 if (tls_sec)
3006 {
3007 struct elf_link_hash_entry *tlsbase;
3008
3009 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3010 "_TLS_MODULE_BASE_",
3011 FALSE, FALSE, FALSE);
3012
3013 if (tlsbase && tlsbase->type == STT_TLS)
3014 {
3015 struct elf_i386_link_hash_table *htab;
3016 struct bfd_link_hash_entry *bh = NULL;
3017 const struct elf_backend_data *bed
3018 = get_elf_backend_data (output_bfd);
3019
3020 htab = elf_i386_hash_table (info);
3021 if (htab == NULL)
3022 return FALSE;
3023
3024 if (!(_bfd_generic_link_add_one_symbol
3025 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3026 tls_sec, 0, NULL, FALSE,
3027 bed->collect, &bh)))
3028 return FALSE;
3029
3030 htab->tls_module_base = bh;
3031
3032 tlsbase = (struct elf_link_hash_entry *)bh;
3033 tlsbase->def_regular = 1;
3034 tlsbase->other = STV_HIDDEN;
3035 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3036 }
3037 }
3038
3039 return TRUE;
3040 }
3041
3042 /* Set the correct type for an x86 ELF section. We do this by the
3043 section name, which is a hack, but ought to work. */
3044
3045 static bfd_boolean
3046 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3047 Elf_Internal_Shdr *hdr,
3048 asection *sec)
3049 {
3050 const char *name;
3051
3052 name = bfd_get_section_name (abfd, sec);
3053
3054 /* This is an ugly, but unfortunately necessary hack that is
3055 needed when producing EFI binaries on x86. It tells
3056 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3057 containing ELF relocation info. We need this hack in order to
3058 be able to generate ELF binaries that can be translated into
3059 EFI applications (which are essentially COFF objects). Those
3060 files contain a COFF ".reloc" section inside an ELFNN object,
3061 which would normally cause BFD to segfault because it would
3062 attempt to interpret this section as containing relocation
3063 entries for section "oc". With this hack enabled, ".reloc"
3064 will be treated as a normal data section, which will avoid the
3065 segfault. However, you won't be able to create an ELFNN binary
3066 with a section named "oc" that needs relocations, but that's
3067 the kind of ugly side-effects you get when detecting section
3068 types based on their names... In practice, this limitation is
3069 unlikely to bite. */
3070 if (strcmp (name, ".reloc") == 0)
3071 hdr->sh_type = SHT_PROGBITS;
3072
3073 return TRUE;
3074 }
3075
3076 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3077 executables. Rather than setting it to the beginning of the TLS
3078 section, we have to set it to the end. This function may be called
3079 multiple times, it is idempotent. */
3080
3081 static void
3082 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3083 {
3084 struct elf_i386_link_hash_table *htab;
3085 struct bfd_link_hash_entry *base;
3086
3087 if (!info->executable)
3088 return;
3089
3090 htab = elf_i386_hash_table (info);
3091 if (htab == NULL)
3092 return;
3093
3094 base = htab->tls_module_base;
3095 if (base == NULL)
3096 return;
3097
3098 base->u.def.value = htab->elf.tls_size;
3099 }
3100
3101 /* Return the base VMA address which should be subtracted from real addresses
3102 when resolving @dtpoff relocation.
3103 This is PT_TLS segment p_vaddr. */
3104
3105 static bfd_vma
3106 elf_i386_dtpoff_base (struct bfd_link_info *info)
3107 {
3108 /* If tls_sec is NULL, we should have signalled an error already. */
3109 if (elf_hash_table (info)->tls_sec == NULL)
3110 return 0;
3111 return elf_hash_table (info)->tls_sec->vma;
3112 }
3113
3114 /* Return the relocation value for @tpoff relocation
3115 if STT_TLS virtual address is ADDRESS. */
3116
3117 static bfd_vma
3118 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3119 {
3120 struct elf_link_hash_table *htab = elf_hash_table (info);
3121 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3122 bfd_vma static_tls_size;
3123
3124 /* If tls_sec is NULL, we should have signalled an error already. */
3125 if (htab->tls_sec == NULL)
3126 return 0;
3127
3128 /* Consider special static TLS alignment requirements. */
3129 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3130 return static_tls_size + htab->tls_sec->vma - address;
3131 }
3132
3133 /* Relocate an i386 ELF section. */
3134
3135 static bfd_boolean
3136 elf_i386_relocate_section (bfd *output_bfd,
3137 struct bfd_link_info *info,
3138 bfd *input_bfd,
3139 asection *input_section,
3140 bfd_byte *contents,
3141 Elf_Internal_Rela *relocs,
3142 Elf_Internal_Sym *local_syms,
3143 asection **local_sections)
3144 {
3145 struct elf_i386_link_hash_table *htab;
3146 Elf_Internal_Shdr *symtab_hdr;
3147 struct elf_link_hash_entry **sym_hashes;
3148 bfd_vma *local_got_offsets;
3149 bfd_vma *local_tlsdesc_gotents;
3150 Elf_Internal_Rela *rel;
3151 Elf_Internal_Rela *relend;
3152 bfd_boolean is_vxworks_tls;
3153 unsigned plt_entry_size;
3154
3155 BFD_ASSERT (is_i386_elf (input_bfd));
3156
3157 htab = elf_i386_hash_table (info);
3158 if (htab == NULL)
3159 return FALSE;
3160 symtab_hdr = &elf_symtab_hdr (input_bfd);
3161 sym_hashes = elf_sym_hashes (input_bfd);
3162 local_got_offsets = elf_local_got_offsets (input_bfd);
3163 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3164 /* We have to handle relocations in vxworks .tls_vars sections
3165 specially, because the dynamic loader is 'weird'. */
3166 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3167 && info->shared
3168 && !strcmp (input_section->output_section->name,
3169 ".tls_vars"));
3170
3171 elf_i386_set_tls_module_base (info);
3172
3173 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3174
3175 rel = relocs;
3176 relend = relocs + input_section->reloc_count;
3177 for (; rel < relend; rel++)
3178 {
3179 unsigned int r_type;
3180 reloc_howto_type *howto;
3181 unsigned long r_symndx;
3182 struct elf_link_hash_entry *h;
3183 Elf_Internal_Sym *sym;
3184 asection *sec;
3185 bfd_vma off, offplt;
3186 bfd_vma relocation;
3187 bfd_boolean unresolved_reloc;
3188 bfd_reloc_status_type r;
3189 unsigned int indx;
3190 int tls_type;
3191 bfd_vma st_size;
3192
3193 r_type = ELF32_R_TYPE (rel->r_info);
3194 if (r_type == R_386_GNU_VTINHERIT
3195 || r_type == R_386_GNU_VTENTRY)
3196 continue;
3197
3198 if ((indx = r_type) >= R_386_standard
3199 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3200 >= R_386_ext - R_386_standard)
3201 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3202 >= R_386_irelative - R_386_ext))
3203 {
3204 (*_bfd_error_handler)
3205 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3206 input_bfd, input_section, r_type);
3207 bfd_set_error (bfd_error_bad_value);
3208 return FALSE;
3209 }
3210 howto = elf_howto_table + indx;
3211
3212 r_symndx = ELF32_R_SYM (rel->r_info);
3213 h = NULL;
3214 sym = NULL;
3215 sec = NULL;
3216 unresolved_reloc = FALSE;
3217 if (r_symndx < symtab_hdr->sh_info)
3218 {
3219 sym = local_syms + r_symndx;
3220 sec = local_sections[r_symndx];
3221 relocation = (sec->output_section->vma
3222 + sec->output_offset
3223 + sym->st_value);
3224 st_size = sym->st_size;
3225
3226 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3227 && ((sec->flags & SEC_MERGE) != 0
3228 || (info->relocatable
3229 && sec->output_offset != 0)))
3230 {
3231 bfd_vma addend;
3232 bfd_byte *where = contents + rel->r_offset;
3233
3234 switch (howto->size)
3235 {
3236 case 0:
3237 addend = bfd_get_8 (input_bfd, where);
3238 if (howto->pc_relative)
3239 {
3240 addend = (addend ^ 0x80) - 0x80;
3241 addend += 1;
3242 }
3243 break;
3244 case 1:
3245 addend = bfd_get_16 (input_bfd, where);
3246 if (howto->pc_relative)
3247 {
3248 addend = (addend ^ 0x8000) - 0x8000;
3249 addend += 2;
3250 }
3251 break;
3252 case 2:
3253 addend = bfd_get_32 (input_bfd, where);
3254 if (howto->pc_relative)
3255 {
3256 addend = (addend ^ 0x80000000) - 0x80000000;
3257 addend += 4;
3258 }
3259 break;
3260 default:
3261 abort ();
3262 }
3263
3264 if (info->relocatable)
3265 addend += sec->output_offset;
3266 else
3267 {
3268 asection *msec = sec;
3269 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3270 addend);
3271 addend -= relocation;
3272 addend += msec->output_section->vma + msec->output_offset;
3273 }
3274
3275 switch (howto->size)
3276 {
3277 case 0:
3278 /* FIXME: overflow checks. */
3279 if (howto->pc_relative)
3280 addend -= 1;
3281 bfd_put_8 (input_bfd, addend, where);
3282 break;
3283 case 1:
3284 if (howto->pc_relative)
3285 addend -= 2;
3286 bfd_put_16 (input_bfd, addend, where);
3287 break;
3288 case 2:
3289 if (howto->pc_relative)
3290 addend -= 4;
3291 bfd_put_32 (input_bfd, addend, where);
3292 break;
3293 }
3294 }
3295 else if (!info->relocatable
3296 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3297 {
3298 /* Relocate against local STT_GNU_IFUNC symbol. */
3299 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3300 FALSE);
3301 if (h == NULL)
3302 abort ();
3303
3304 /* Set STT_GNU_IFUNC symbol value. */
3305 h->root.u.def.value = sym->st_value;
3306 h->root.u.def.section = sec;
3307 }
3308 }
3309 else
3310 {
3311 bfd_boolean warned ATTRIBUTE_UNUSED;
3312 bfd_boolean ignored ATTRIBUTE_UNUSED;
3313
3314 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3315 r_symndx, symtab_hdr, sym_hashes,
3316 h, sec, relocation,
3317 unresolved_reloc, warned, ignored);
3318 st_size = h->size;
3319 }
3320
3321 if (sec != NULL && discarded_section (sec))
3322 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3323 rel, 1, relend, howto, 0, contents);
3324
3325 if (info->relocatable)
3326 continue;
3327
3328 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3329 it here if it is defined in a non-shared object. */
3330 if (h != NULL
3331 && h->type == STT_GNU_IFUNC
3332 && h->def_regular)
3333 {
3334 asection *plt, *gotplt, *base_got;
3335 bfd_vma plt_index;
3336 const char *name;
3337
3338 if ((input_section->flags & SEC_ALLOC) == 0
3339 || h->plt.offset == (bfd_vma) -1)
3340 abort ();
3341
3342 /* STT_GNU_IFUNC symbol must go through PLT. */
3343 if (htab->elf.splt != NULL)
3344 {
3345 plt = htab->elf.splt;
3346 gotplt = htab->elf.sgotplt;
3347 }
3348 else
3349 {
3350 plt = htab->elf.iplt;
3351 gotplt = htab->elf.igotplt;
3352 }
3353
3354 relocation = (plt->output_section->vma
3355 + plt->output_offset + h->plt.offset);
3356
3357 switch (r_type)
3358 {
3359 default:
3360 if (h->root.root.string)
3361 name = h->root.root.string;
3362 else
3363 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3364 NULL);
3365 (*_bfd_error_handler)
3366 (_("%B: relocation %s against STT_GNU_IFUNC "
3367 "symbol `%s' isn't handled by %s"), input_bfd,
3368 elf_howto_table[r_type].name,
3369 name, __FUNCTION__);
3370 bfd_set_error (bfd_error_bad_value);
3371 return FALSE;
3372
3373 case R_386_32:
3374 /* Generate dynamic relcoation only when there is a
3375 non-GOT reference in a shared object. */
3376 if (info->shared && h->non_got_ref)
3377 {
3378 Elf_Internal_Rela outrel;
3379 asection *sreloc;
3380 bfd_vma offset;
3381
3382 /* Need a dynamic relocation to get the real function
3383 adddress. */
3384 offset = _bfd_elf_section_offset (output_bfd,
3385 info,
3386 input_section,
3387 rel->r_offset);
3388 if (offset == (bfd_vma) -1
3389 || offset == (bfd_vma) -2)
3390 abort ();
3391
3392 outrel.r_offset = (input_section->output_section->vma
3393 + input_section->output_offset
3394 + offset);
3395
3396 if (h->dynindx == -1
3397 || h->forced_local
3398 || info->executable)
3399 {
3400 /* This symbol is resolved locally. */
3401 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3402 bfd_put_32 (output_bfd,
3403 (h->root.u.def.value
3404 + h->root.u.def.section->output_section->vma
3405 + h->root.u.def.section->output_offset),
3406 contents + offset);
3407 }
3408 else
3409 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3410
3411 sreloc = htab->elf.irelifunc;
3412 elf_append_rel (output_bfd, sreloc, &outrel);
3413
3414 /* If this reloc is against an external symbol, we
3415 do not want to fiddle with the addend. Otherwise,
3416 we need to include the symbol value so that it
3417 becomes an addend for the dynamic reloc. For an
3418 internal symbol, we have updated addend. */
3419 continue;
3420 }
3421 /* FALLTHROUGH */
3422 case R_386_PC32:
3423 case R_386_PLT32:
3424 goto do_relocation;
3425
3426 case R_386_GOT32:
3427 base_got = htab->elf.sgot;
3428 off = h->got.offset;
3429
3430 if (base_got == NULL)
3431 abort ();
3432
3433 if (off == (bfd_vma) -1)
3434 {
3435 /* We can't use h->got.offset here to save state, or
3436 even just remember the offset, as finish_dynamic_symbol
3437 would use that as offset into .got. */
3438
3439 if (htab->elf.splt != NULL)
3440 {
3441 plt_index = h->plt.offset / plt_entry_size - 1;
3442 off = (plt_index + 3) * 4;
3443 base_got = htab->elf.sgotplt;
3444 }
3445 else
3446 {
3447 plt_index = h->plt.offset / plt_entry_size;
3448 off = plt_index * 4;
3449 base_got = htab->elf.igotplt;
3450 }
3451
3452 if (h->dynindx == -1
3453 || h->forced_local
3454 || info->symbolic)
3455 {
3456 /* This references the local defitionion. We must
3457 initialize this entry in the global offset table.
3458 Since the offset must always be a multiple of 8,
3459 we use the least significant bit to record
3460 whether we have initialized it already.
3461
3462 When doing a dynamic link, we create a .rela.got
3463 relocation entry to initialize the value. This
3464 is done in the finish_dynamic_symbol routine. */
3465 if ((off & 1) != 0)
3466 off &= ~1;
3467 else
3468 {
3469 bfd_put_32 (output_bfd, relocation,
3470 base_got->contents + off);
3471 h->got.offset |= 1;
3472 }
3473 }
3474
3475 relocation = off;
3476
3477 /* Adjust for static executables. */
3478 if (htab->elf.splt == NULL)
3479 relocation += gotplt->output_offset;
3480 }
3481 else
3482 {
3483 relocation = (base_got->output_section->vma
3484 + base_got->output_offset + off
3485 - gotplt->output_section->vma
3486 - gotplt->output_offset);
3487 /* Adjust for static executables. */
3488 if (htab->elf.splt == NULL)
3489 relocation += gotplt->output_offset;
3490 }
3491
3492 goto do_relocation;
3493
3494 case R_386_GOTOFF:
3495 relocation -= (gotplt->output_section->vma
3496 + gotplt->output_offset);
3497 goto do_relocation;
3498 }
3499 }
3500
3501 switch (r_type)
3502 {
3503 case R_386_GOT32:
3504 /* Relocation is to the entry for this symbol in the global
3505 offset table. */
3506 if (htab->elf.sgot == NULL)
3507 abort ();
3508
3509 if (h != NULL)
3510 {
3511 bfd_boolean dyn;
3512
3513 off = h->got.offset;
3514 dyn = htab->elf.dynamic_sections_created;
3515 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3516 || (info->shared
3517 && SYMBOL_REFERENCES_LOCAL (info, h))
3518 || (ELF_ST_VISIBILITY (h->other)
3519 && h->root.type == bfd_link_hash_undefweak))
3520 {
3521 /* This is actually a static link, or it is a
3522 -Bsymbolic link and the symbol is defined
3523 locally, or the symbol was forced to be local
3524 because of a version file. We must initialize
3525 this entry in the global offset table. Since the
3526 offset must always be a multiple of 4, we use the
3527 least significant bit to record whether we have
3528 initialized it already.
3529
3530 When doing a dynamic link, we create a .rel.got
3531 relocation entry to initialize the value. This
3532 is done in the finish_dynamic_symbol routine. */
3533 if ((off & 1) != 0)
3534 off &= ~1;
3535 else
3536 {
3537 bfd_put_32 (output_bfd, relocation,
3538 htab->elf.sgot->contents + off);
3539 h->got.offset |= 1;
3540 }
3541 }
3542 else
3543 unresolved_reloc = FALSE;
3544 }
3545 else
3546 {
3547 if (local_got_offsets == NULL)
3548 abort ();
3549
3550 off = local_got_offsets[r_symndx];
3551
3552 /* The offset must always be a multiple of 4. We use
3553 the least significant bit to record whether we have
3554 already generated the necessary reloc. */
3555 if ((off & 1) != 0)
3556 off &= ~1;
3557 else
3558 {
3559 bfd_put_32 (output_bfd, relocation,
3560 htab->elf.sgot->contents + off);
3561
3562 if (info->shared)
3563 {
3564 asection *s;
3565 Elf_Internal_Rela outrel;
3566
3567 s = htab->elf.srelgot;
3568 if (s == NULL)
3569 abort ();
3570
3571 outrel.r_offset = (htab->elf.sgot->output_section->vma
3572 + htab->elf.sgot->output_offset
3573 + off);
3574 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3575 elf_append_rel (output_bfd, s, &outrel);
3576 }
3577
3578 local_got_offsets[r_symndx] |= 1;
3579 }
3580 }
3581
3582 if (off >= (bfd_vma) -2)
3583 abort ();
3584
3585 relocation = htab->elf.sgot->output_section->vma
3586 + htab->elf.sgot->output_offset + off
3587 - htab->elf.sgotplt->output_section->vma
3588 - htab->elf.sgotplt->output_offset;
3589 break;
3590
3591 case R_386_GOTOFF:
3592 /* Relocation is relative to the start of the global offset
3593 table. */
3594
3595 /* Check to make sure it isn't a protected function symbol
3596 for shared library since it may not be local when used
3597 as function address. We also need to make sure that a
3598 symbol is defined locally. */
3599 if (info->shared && h)
3600 {
3601 if (!h->def_regular)
3602 {
3603 const char *v;
3604
3605 switch (ELF_ST_VISIBILITY (h->other))
3606 {
3607 case STV_HIDDEN:
3608 v = _("hidden symbol");
3609 break;
3610 case STV_INTERNAL:
3611 v = _("internal symbol");
3612 break;
3613 case STV_PROTECTED:
3614 v = _("protected symbol");
3615 break;
3616 default:
3617 v = _("symbol");
3618 break;
3619 }
3620
3621 (*_bfd_error_handler)
3622 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3623 input_bfd, v, h->root.root.string);
3624 bfd_set_error (bfd_error_bad_value);
3625 return FALSE;
3626 }
3627 else if (!info->executable
3628 && !SYMBOLIC_BIND (info, h)
3629 && h->type == STT_FUNC
3630 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3631 {
3632 (*_bfd_error_handler)
3633 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3634 input_bfd, h->root.root.string);
3635 bfd_set_error (bfd_error_bad_value);
3636 return FALSE;
3637 }
3638 }
3639
3640 /* Note that sgot is not involved in this
3641 calculation. We always want the start of .got.plt. If we
3642 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3643 permitted by the ABI, we might have to change this
3644 calculation. */
3645 relocation -= htab->elf.sgotplt->output_section->vma
3646 + htab->elf.sgotplt->output_offset;
3647 break;
3648
3649 case R_386_GOTPC:
3650 /* Use global offset table as symbol value. */
3651 relocation = htab->elf.sgotplt->output_section->vma
3652 + htab->elf.sgotplt->output_offset;
3653 unresolved_reloc = FALSE;
3654 break;
3655
3656 case R_386_PLT32:
3657 /* Relocation is to the entry for this symbol in the
3658 procedure linkage table. */
3659
3660 /* Resolve a PLT32 reloc against a local symbol directly,
3661 without using the procedure linkage table. */
3662 if (h == NULL)
3663 break;
3664
3665 if (h->plt.offset == (bfd_vma) -1
3666 || htab->elf.splt == NULL)
3667 {
3668 /* We didn't make a PLT entry for this symbol. This
3669 happens when statically linking PIC code, or when
3670 using -Bsymbolic. */
3671 break;
3672 }
3673
3674 relocation = (htab->elf.splt->output_section->vma
3675 + htab->elf.splt->output_offset
3676 + h->plt.offset);
3677 unresolved_reloc = FALSE;
3678 break;
3679
3680 case R_386_SIZE32:
3681 /* Set to symbol size. */
3682 relocation = st_size;
3683 /* Fall through. */
3684
3685 case R_386_32:
3686 case R_386_PC32:
3687 if ((input_section->flags & SEC_ALLOC) == 0
3688 || is_vxworks_tls)
3689 break;
3690
3691 if ((info->shared
3692 && (h == NULL
3693 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3694 || h->root.type != bfd_link_hash_undefweak)
3695 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3696 || !SYMBOL_CALLS_LOCAL (info, h)))
3697 || (ELIMINATE_COPY_RELOCS
3698 && !info->shared
3699 && h != NULL
3700 && h->dynindx != -1
3701 && !h->non_got_ref
3702 && ((h->def_dynamic
3703 && !h->def_regular)
3704 || h->root.type == bfd_link_hash_undefweak
3705 || h->root.type == bfd_link_hash_undefined)))
3706 {
3707 Elf_Internal_Rela outrel;
3708 bfd_boolean skip, relocate;
3709 asection *sreloc;
3710
3711 /* When generating a shared object, these relocations
3712 are copied into the output file to be resolved at run
3713 time. */
3714
3715 skip = FALSE;
3716 relocate = FALSE;
3717
3718 outrel.r_offset =
3719 _bfd_elf_section_offset (output_bfd, info, input_section,
3720 rel->r_offset);
3721 if (outrel.r_offset == (bfd_vma) -1)
3722 skip = TRUE;
3723 else if (outrel.r_offset == (bfd_vma) -2)
3724 skip = TRUE, relocate = TRUE;
3725 outrel.r_offset += (input_section->output_section->vma
3726 + input_section->output_offset);
3727
3728 if (skip)
3729 memset (&outrel, 0, sizeof outrel);
3730 else if (h != NULL
3731 && h->dynindx != -1
3732 && (r_type == R_386_PC32
3733 || !info->shared
3734 || !SYMBOLIC_BIND (info, h)
3735 || !h->def_regular))
3736 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3737 else
3738 {
3739 /* This symbol is local, or marked to become local. */
3740 relocate = TRUE;
3741 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3742 }
3743
3744 sreloc = elf_section_data (input_section)->sreloc;
3745
3746 if (sreloc == NULL || sreloc->contents == NULL)
3747 {
3748 r = bfd_reloc_notsupported;
3749 goto check_relocation_error;
3750 }
3751
3752 elf_append_rel (output_bfd, sreloc, &outrel);
3753
3754 /* If this reloc is against an external symbol, we do
3755 not want to fiddle with the addend. Otherwise, we
3756 need to include the symbol value so that it becomes
3757 an addend for the dynamic reloc. */
3758 if (! relocate)
3759 continue;
3760 }
3761 break;
3762
3763 case R_386_TLS_IE:
3764 if (!info->executable)
3765 {
3766 Elf_Internal_Rela outrel;
3767 asection *sreloc;
3768
3769 outrel.r_offset = rel->r_offset
3770 + input_section->output_section->vma
3771 + input_section->output_offset;
3772 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3773 sreloc = elf_section_data (input_section)->sreloc;
3774 if (sreloc == NULL)
3775 abort ();
3776 elf_append_rel (output_bfd, sreloc, &outrel);
3777 }
3778 /* Fall through */
3779
3780 case R_386_TLS_GD:
3781 case R_386_TLS_GOTDESC:
3782 case R_386_TLS_DESC_CALL:
3783 case R_386_TLS_IE_32:
3784 case R_386_TLS_GOTIE:
3785 tls_type = GOT_UNKNOWN;
3786 if (h == NULL && local_got_offsets)
3787 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3788 else if (h != NULL)
3789 tls_type = elf_i386_hash_entry(h)->tls_type;
3790 if (tls_type == GOT_TLS_IE)
3791 tls_type = GOT_TLS_IE_NEG;
3792
3793 if (! elf_i386_tls_transition (info, input_bfd,
3794 input_section, contents,
3795 symtab_hdr, sym_hashes,
3796 &r_type, tls_type, rel,
3797 relend, h, r_symndx))
3798 return FALSE;
3799
3800 if (r_type == R_386_TLS_LE_32)
3801 {
3802 BFD_ASSERT (! unresolved_reloc);
3803 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3804 {
3805 unsigned int type;
3806 bfd_vma roff;
3807
3808 /* GD->LE transition. */
3809 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3810 if (type == 0x04)
3811 {
3812 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3813 Change it into:
3814 movl %gs:0, %eax; subl $foo@tpoff, %eax
3815 (6 byte form of subl). */
3816 memcpy (contents + rel->r_offset - 3,
3817 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3818 roff = rel->r_offset + 5;
3819 }
3820 else
3821 {
3822 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3823 Change it into:
3824 movl %gs:0, %eax; subl $foo@tpoff, %eax
3825 (6 byte form of subl). */
3826 memcpy (contents + rel->r_offset - 2,
3827 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3828 roff = rel->r_offset + 6;
3829 }
3830 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3831 contents + roff);
3832 /* Skip R_386_PC32/R_386_PLT32. */
3833 rel++;
3834 continue;
3835 }
3836 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3837 {
3838 /* GDesc -> LE transition.
3839 It's originally something like:
3840 leal x@tlsdesc(%ebx), %eax
3841
3842 leal x@ntpoff, %eax
3843
3844 Registers other than %eax may be set up here. */
3845
3846 unsigned int val;
3847 bfd_vma roff;
3848
3849 roff = rel->r_offset;
3850 val = bfd_get_8 (input_bfd, contents + roff - 1);
3851
3852 /* Now modify the instruction as appropriate. */
3853 /* aoliva FIXME: remove the above and xor the byte
3854 below with 0x86. */
3855 bfd_put_8 (output_bfd, val ^ 0x86,
3856 contents + roff - 1);
3857 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3858 contents + roff);
3859 continue;
3860 }
3861 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3862 {
3863 /* GDesc -> LE transition.
3864 It's originally:
3865 call *(%eax)
3866 Turn it into:
3867 xchg %ax,%ax */
3868
3869 bfd_vma roff;
3870
3871 roff = rel->r_offset;
3872 bfd_put_8 (output_bfd, 0x66, contents + roff);
3873 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3874 continue;
3875 }
3876 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3877 {
3878 unsigned int val;
3879
3880 /* IE->LE transition:
3881 Originally it can be one of:
3882 movl foo, %eax
3883 movl foo, %reg
3884 addl foo, %reg
3885 We change it into:
3886 movl $foo, %eax
3887 movl $foo, %reg
3888 addl $foo, %reg. */
3889 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3890 if (val == 0xa1)
3891 {
3892 /* movl foo, %eax. */
3893 bfd_put_8 (output_bfd, 0xb8,
3894 contents + rel->r_offset - 1);
3895 }
3896 else
3897 {
3898 unsigned int type;
3899
3900 type = bfd_get_8 (input_bfd,
3901 contents + rel->r_offset - 2);
3902 switch (type)
3903 {
3904 case 0x8b:
3905 /* movl */
3906 bfd_put_8 (output_bfd, 0xc7,
3907 contents + rel->r_offset - 2);
3908 bfd_put_8 (output_bfd,
3909 0xc0 | ((val >> 3) & 7),
3910 contents + rel->r_offset - 1);
3911 break;
3912 case 0x03:
3913 /* addl */
3914 bfd_put_8 (output_bfd, 0x81,
3915 contents + rel->r_offset - 2);
3916 bfd_put_8 (output_bfd,
3917 0xc0 | ((val >> 3) & 7),
3918 contents + rel->r_offset - 1);
3919 break;
3920 default:
3921 BFD_FAIL ();
3922 break;
3923 }
3924 }
3925 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3926 contents + rel->r_offset);
3927 continue;
3928 }
3929 else
3930 {
3931 unsigned int val, type;
3932
3933 /* {IE_32,GOTIE}->LE transition:
3934 Originally it can be one of:
3935 subl foo(%reg1), %reg2
3936 movl foo(%reg1), %reg2
3937 addl foo(%reg1), %reg2
3938 We change it into:
3939 subl $foo, %reg2
3940 movl $foo, %reg2 (6 byte form)
3941 addl $foo, %reg2. */
3942 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3943 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3944 if (type == 0x8b)
3945 {
3946 /* movl */
3947 bfd_put_8 (output_bfd, 0xc7,
3948 contents + rel->r_offset - 2);
3949 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3950 contents + rel->r_offset - 1);
3951 }
3952 else if (type == 0x2b)
3953 {
3954 /* subl */
3955 bfd_put_8 (output_bfd, 0x81,
3956 contents + rel->r_offset - 2);
3957 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3958 contents + rel->r_offset - 1);
3959 }
3960 else if (type == 0x03)
3961 {
3962 /* addl */
3963 bfd_put_8 (output_bfd, 0x81,
3964 contents + rel->r_offset - 2);
3965 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3966 contents + rel->r_offset - 1);
3967 }
3968 else
3969 BFD_FAIL ();
3970 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3971 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3972 contents + rel->r_offset);
3973 else
3974 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3975 contents + rel->r_offset);
3976 continue;
3977 }
3978 }
3979
3980 if (htab->elf.sgot == NULL)
3981 abort ();
3982
3983 if (h != NULL)
3984 {
3985 off = h->got.offset;
3986 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3987 }
3988 else
3989 {
3990 if (local_got_offsets == NULL)
3991 abort ();
3992
3993 off = local_got_offsets[r_symndx];
3994 offplt = local_tlsdesc_gotents[r_symndx];
3995 }
3996
3997 if ((off & 1) != 0)
3998 off &= ~1;
3999 else
4000 {
4001 Elf_Internal_Rela outrel;
4002 int dr_type;
4003 asection *sreloc;
4004
4005 if (htab->elf.srelgot == NULL)
4006 abort ();
4007
4008 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4009
4010 if (GOT_TLS_GDESC_P (tls_type))
4011 {
4012 bfd_byte *loc;
4013 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4014 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4015 <= htab->elf.sgotplt->size);
4016 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4017 + htab->elf.sgotplt->output_offset
4018 + offplt
4019 + htab->sgotplt_jump_table_size);
4020 sreloc = htab->elf.srelplt;
4021 loc = sreloc->contents;
4022 loc += (htab->next_tls_desc_index++
4023 * sizeof (Elf32_External_Rel));
4024 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4025 <= sreloc->contents + sreloc->size);
4026 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4027 if (indx == 0)
4028 {
4029 BFD_ASSERT (! unresolved_reloc);
4030 bfd_put_32 (output_bfd,
4031 relocation - elf_i386_dtpoff_base (info),
4032 htab->elf.sgotplt->contents + offplt
4033 + htab->sgotplt_jump_table_size + 4);
4034 }
4035 else
4036 {
4037 bfd_put_32 (output_bfd, 0,
4038 htab->elf.sgotplt->contents + offplt
4039 + htab->sgotplt_jump_table_size + 4);
4040 }
4041 }
4042
4043 sreloc = htab->elf.srelgot;
4044
4045 outrel.r_offset = (htab->elf.sgot->output_section->vma
4046 + htab->elf.sgot->output_offset + off);
4047
4048 if (GOT_TLS_GD_P (tls_type))
4049 dr_type = R_386_TLS_DTPMOD32;
4050 else if (GOT_TLS_GDESC_P (tls_type))
4051 goto dr_done;
4052 else if (tls_type == GOT_TLS_IE_POS)
4053 dr_type = R_386_TLS_TPOFF;
4054 else
4055 dr_type = R_386_TLS_TPOFF32;
4056
4057 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4058 bfd_put_32 (output_bfd,
4059 relocation - elf_i386_dtpoff_base (info),
4060 htab->elf.sgot->contents + off);
4061 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4062 bfd_put_32 (output_bfd,
4063 elf_i386_dtpoff_base (info) - relocation,
4064 htab->elf.sgot->contents + off);
4065 else if (dr_type != R_386_TLS_DESC)
4066 bfd_put_32 (output_bfd, 0,
4067 htab->elf.sgot->contents + off);
4068 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4069
4070 elf_append_rel (output_bfd, sreloc, &outrel);
4071
4072 if (GOT_TLS_GD_P (tls_type))
4073 {
4074 if (indx == 0)
4075 {
4076 BFD_ASSERT (! unresolved_reloc);
4077 bfd_put_32 (output_bfd,
4078 relocation - elf_i386_dtpoff_base (info),
4079 htab->elf.sgot->contents + off + 4);
4080 }
4081 else
4082 {
4083 bfd_put_32 (output_bfd, 0,
4084 htab->elf.sgot->contents + off + 4);
4085 outrel.r_info = ELF32_R_INFO (indx,
4086 R_386_TLS_DTPOFF32);
4087 outrel.r_offset += 4;
4088 elf_append_rel (output_bfd, sreloc, &outrel);
4089 }
4090 }
4091 else if (tls_type == GOT_TLS_IE_BOTH)
4092 {
4093 bfd_put_32 (output_bfd,
4094 (indx == 0
4095 ? relocation - elf_i386_dtpoff_base (info)
4096 : 0),
4097 htab->elf.sgot->contents + off + 4);
4098 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4099 outrel.r_offset += 4;
4100 elf_append_rel (output_bfd, sreloc, &outrel);
4101 }
4102
4103 dr_done:
4104 if (h != NULL)
4105 h->got.offset |= 1;
4106 else
4107 local_got_offsets[r_symndx] |= 1;
4108 }
4109
4110 if (off >= (bfd_vma) -2
4111 && ! GOT_TLS_GDESC_P (tls_type))
4112 abort ();
4113 if (r_type == R_386_TLS_GOTDESC
4114 || r_type == R_386_TLS_DESC_CALL)
4115 {
4116 relocation = htab->sgotplt_jump_table_size + offplt;
4117 unresolved_reloc = FALSE;
4118 }
4119 else if (r_type == ELF32_R_TYPE (rel->r_info))
4120 {
4121 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4122 + htab->elf.sgotplt->output_offset;
4123 relocation = htab->elf.sgot->output_section->vma
4124 + htab->elf.sgot->output_offset + off - g_o_t;
4125 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4126 && tls_type == GOT_TLS_IE_BOTH)
4127 relocation += 4;
4128 if (r_type == R_386_TLS_IE)
4129 relocation += g_o_t;
4130 unresolved_reloc = FALSE;
4131 }
4132 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4133 {
4134 unsigned int val, type;
4135 bfd_vma roff;
4136
4137 /* GD->IE transition. */
4138 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4139 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4140 if (type == 0x04)
4141 {
4142 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4143 Change it into:
4144 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4145 val >>= 3;
4146 roff = rel->r_offset - 3;
4147 }
4148 else
4149 {
4150 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4151 Change it into:
4152 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4153 roff = rel->r_offset - 2;
4154 }
4155 memcpy (contents + roff,
4156 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4157 contents[roff + 7] = 0x80 | (val & 7);
4158 /* If foo is used only with foo@gotntpoff(%reg) and
4159 foo@indntpoff, but not with foo@gottpoff(%reg), change
4160 subl $foo@gottpoff(%reg), %eax
4161 into:
4162 addl $foo@gotntpoff(%reg), %eax. */
4163 if (tls_type == GOT_TLS_IE_POS)
4164 contents[roff + 6] = 0x03;
4165 bfd_put_32 (output_bfd,
4166 htab->elf.sgot->output_section->vma
4167 + htab->elf.sgot->output_offset + off
4168 - htab->elf.sgotplt->output_section->vma
4169 - htab->elf.sgotplt->output_offset,
4170 contents + roff + 8);
4171 /* Skip R_386_PLT32. */
4172 rel++;
4173 continue;
4174 }
4175 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4176 {
4177 /* GDesc -> IE transition.
4178 It's originally something like:
4179 leal x@tlsdesc(%ebx), %eax
4180
4181 Change it to:
4182 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4183 or:
4184 movl x@gottpoff(%ebx), %eax # before negl %eax
4185
4186 Registers other than %eax may be set up here. */
4187
4188 bfd_vma roff;
4189
4190 /* First, make sure it's a leal adding ebx to a 32-bit
4191 offset into any register, although it's probably
4192 almost always going to be eax. */
4193 roff = rel->r_offset;
4194
4195 /* Now modify the instruction as appropriate. */
4196 /* To turn a leal into a movl in the form we use it, it
4197 suffices to change the first byte from 0x8d to 0x8b.
4198 aoliva FIXME: should we decide to keep the leal, all
4199 we have to do is remove the statement below, and
4200 adjust the relaxation of R_386_TLS_DESC_CALL. */
4201 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4202
4203 if (tls_type == GOT_TLS_IE_BOTH)
4204 off += 4;
4205
4206 bfd_put_32 (output_bfd,
4207 htab->elf.sgot->output_section->vma
4208 + htab->elf.sgot->output_offset + off
4209 - htab->elf.sgotplt->output_section->vma
4210 - htab->elf.sgotplt->output_offset,
4211 contents + roff);
4212 continue;
4213 }
4214 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4215 {
4216 /* GDesc -> IE transition.
4217 It's originally:
4218 call *(%eax)
4219
4220 Change it to:
4221 xchg %ax,%ax
4222 or
4223 negl %eax
4224 depending on how we transformed the TLS_GOTDESC above.
4225 */
4226
4227 bfd_vma roff;
4228
4229 roff = rel->r_offset;
4230
4231 /* Now modify the instruction as appropriate. */
4232 if (tls_type != GOT_TLS_IE_NEG)
4233 {
4234 /* xchg %ax,%ax */
4235 bfd_put_8 (output_bfd, 0x66, contents + roff);
4236 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4237 }
4238 else
4239 {
4240 /* negl %eax */
4241 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4242 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4243 }
4244
4245 continue;
4246 }
4247 else
4248 BFD_ASSERT (FALSE);
4249 break;
4250
4251 case R_386_TLS_LDM:
4252 if (! elf_i386_tls_transition (info, input_bfd,
4253 input_section, contents,
4254 symtab_hdr, sym_hashes,
4255 &r_type, GOT_UNKNOWN, rel,
4256 relend, h, r_symndx))
4257 return FALSE;
4258
4259 if (r_type != R_386_TLS_LDM)
4260 {
4261 /* LD->LE transition:
4262 leal foo(%reg), %eax; call ___tls_get_addr.
4263 We change it into:
4264 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4265 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4266 memcpy (contents + rel->r_offset - 2,
4267 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4268 /* Skip R_386_PC32/R_386_PLT32. */
4269 rel++;
4270 continue;
4271 }
4272
4273 if (htab->elf.sgot == NULL)
4274 abort ();
4275
4276 off = htab->tls_ldm_got.offset;
4277 if (off & 1)
4278 off &= ~1;
4279 else
4280 {
4281 Elf_Internal_Rela outrel;
4282
4283 if (htab->elf.srelgot == NULL)
4284 abort ();
4285
4286 outrel.r_offset = (htab->elf.sgot->output_section->vma
4287 + htab->elf.sgot->output_offset + off);
4288
4289 bfd_put_32 (output_bfd, 0,
4290 htab->elf.sgot->contents + off);
4291 bfd_put_32 (output_bfd, 0,
4292 htab->elf.sgot->contents + off + 4);
4293 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4294 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4295 htab->tls_ldm_got.offset |= 1;
4296 }
4297 relocation = htab->elf.sgot->output_section->vma
4298 + htab->elf.sgot->output_offset + off
4299 - htab->elf.sgotplt->output_section->vma
4300 - htab->elf.sgotplt->output_offset;
4301 unresolved_reloc = FALSE;
4302 break;
4303
4304 case R_386_TLS_LDO_32:
4305 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4306 relocation -= elf_i386_dtpoff_base (info);
4307 else
4308 /* When converting LDO to LE, we must negate. */
4309 relocation = -elf_i386_tpoff (info, relocation);
4310 break;
4311
4312 case R_386_TLS_LE_32:
4313 case R_386_TLS_LE:
4314 if (!info->executable)
4315 {
4316 Elf_Internal_Rela outrel;
4317 asection *sreloc;
4318
4319 outrel.r_offset = rel->r_offset
4320 + input_section->output_section->vma
4321 + input_section->output_offset;
4322 if (h != NULL && h->dynindx != -1)
4323 indx = h->dynindx;
4324 else
4325 indx = 0;
4326 if (r_type == R_386_TLS_LE_32)
4327 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4328 else
4329 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4330 sreloc = elf_section_data (input_section)->sreloc;
4331 if (sreloc == NULL)
4332 abort ();
4333 elf_append_rel (output_bfd, sreloc, &outrel);
4334 if (indx)
4335 continue;
4336 else if (r_type == R_386_TLS_LE_32)
4337 relocation = elf_i386_dtpoff_base (info) - relocation;
4338 else
4339 relocation -= elf_i386_dtpoff_base (info);
4340 }
4341 else if (r_type == R_386_TLS_LE_32)
4342 relocation = elf_i386_tpoff (info, relocation);
4343 else
4344 relocation = -elf_i386_tpoff (info, relocation);
4345 break;
4346
4347 default:
4348 break;
4349 }
4350
4351 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4352 because such sections are not SEC_ALLOC and thus ld.so will
4353 not process them. */
4354 if (unresolved_reloc
4355 && !((input_section->flags & SEC_DEBUGGING) != 0
4356 && h->def_dynamic)
4357 && _bfd_elf_section_offset (output_bfd, info, input_section,
4358 rel->r_offset) != (bfd_vma) -1)
4359 {
4360 (*_bfd_error_handler)
4361 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4362 input_bfd,
4363 input_section,
4364 (long) rel->r_offset,
4365 howto->name,
4366 h->root.root.string);
4367 return FALSE;
4368 }
4369
4370 do_relocation:
4371 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4372 contents, rel->r_offset,
4373 relocation, 0);
4374
4375 check_relocation_error:
4376 if (r != bfd_reloc_ok)
4377 {
4378 const char *name;
4379
4380 if (h != NULL)
4381 name = h->root.root.string;
4382 else
4383 {
4384 name = bfd_elf_string_from_elf_section (input_bfd,
4385 symtab_hdr->sh_link,
4386 sym->st_name);
4387 if (name == NULL)
4388 return FALSE;
4389 if (*name == '\0')
4390 name = bfd_section_name (input_bfd, sec);
4391 }
4392
4393 if (r == bfd_reloc_overflow)
4394 {
4395 if (! ((*info->callbacks->reloc_overflow)
4396 (info, (h ? &h->root : NULL), name, howto->name,
4397 (bfd_vma) 0, input_bfd, input_section,
4398 rel->r_offset)))
4399 return FALSE;
4400 }
4401 else
4402 {
4403 (*_bfd_error_handler)
4404 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4405 input_bfd, input_section,
4406 (long) rel->r_offset, name, (int) r);
4407 return FALSE;
4408 }
4409 }
4410 }
4411
4412 return TRUE;
4413 }
4414
4415 /* Finish up dynamic symbol handling. We set the contents of various
4416 dynamic sections here. */
4417
4418 static bfd_boolean
4419 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4420 struct bfd_link_info *info,
4421 struct elf_link_hash_entry *h,
4422 Elf_Internal_Sym *sym)
4423 {
4424 struct elf_i386_link_hash_table *htab;
4425 unsigned plt_entry_size;
4426 const struct elf_i386_backend_data *abed;
4427
4428 htab = elf_i386_hash_table (info);
4429 if (htab == NULL)
4430 return FALSE;
4431
4432 abed = get_elf_i386_backend_data (output_bfd);
4433 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4434
4435 if (h->plt.offset != (bfd_vma) -1)
4436 {
4437 bfd_vma plt_index;
4438 bfd_vma got_offset;
4439 Elf_Internal_Rela rel;
4440 bfd_byte *loc;
4441 asection *plt, *gotplt, *relplt;
4442
4443 /* When building a static executable, use .iplt, .igot.plt and
4444 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4445 if (htab->elf.splt != NULL)
4446 {
4447 plt = htab->elf.splt;
4448 gotplt = htab->elf.sgotplt;
4449 relplt = htab->elf.srelplt;
4450 }
4451 else
4452 {
4453 plt = htab->elf.iplt;
4454 gotplt = htab->elf.igotplt;
4455 relplt = htab->elf.irelplt;
4456 }
4457
4458 /* This symbol has an entry in the procedure linkage table. Set
4459 it up. */
4460
4461 if ((h->dynindx == -1
4462 && !((h->forced_local || info->executable)
4463 && h->def_regular
4464 && h->type == STT_GNU_IFUNC))
4465 || plt == NULL
4466 || gotplt == NULL
4467 || relplt == NULL)
4468 abort ();
4469
4470 /* Get the index in the procedure linkage table which
4471 corresponds to this symbol. This is the index of this symbol
4472 in all the symbols for which we are making plt entries. The
4473 first entry in the procedure linkage table is reserved.
4474
4475 Get the offset into the .got table of the entry that
4476 corresponds to this function. Each .got entry is 4 bytes.
4477 The first three are reserved.
4478
4479 For static executables, we don't reserve anything. */
4480
4481 if (plt == htab->elf.splt)
4482 {
4483 got_offset = h->plt.offset / plt_entry_size - 1;
4484 got_offset = (got_offset + 3) * 4;
4485 }
4486 else
4487 {
4488 got_offset = h->plt.offset / plt_entry_size;
4489 got_offset = got_offset * 4;
4490 }
4491
4492 /* Fill in the entry in the procedure linkage table. */
4493 if (! info->shared)
4494 {
4495 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4496 abed->plt->plt_entry_size);
4497 bfd_put_32 (output_bfd,
4498 (gotplt->output_section->vma
4499 + gotplt->output_offset
4500 + got_offset),
4501 plt->contents + h->plt.offset
4502 + abed->plt->plt_got_offset);
4503
4504 if (abed->is_vxworks)
4505 {
4506 int s, k, reloc_index;
4507
4508 /* Create the R_386_32 relocation referencing the GOT
4509 for this PLT entry. */
4510
4511 /* S: Current slot number (zero-based). */
4512 s = ((h->plt.offset - abed->plt->plt_entry_size)
4513 / abed->plt->plt_entry_size);
4514 /* K: Number of relocations for PLTResolve. */
4515 if (info->shared)
4516 k = PLTRESOLVE_RELOCS_SHLIB;
4517 else
4518 k = PLTRESOLVE_RELOCS;
4519 /* Skip the PLTresolve relocations, and the relocations for
4520 the other PLT slots. */
4521 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4522 loc = (htab->srelplt2->contents + reloc_index
4523 * sizeof (Elf32_External_Rel));
4524
4525 rel.r_offset = (htab->elf.splt->output_section->vma
4526 + htab->elf.splt->output_offset
4527 + h->plt.offset + 2),
4528 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4529 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4530
4531 /* Create the R_386_32 relocation referencing the beginning of
4532 the PLT for this GOT entry. */
4533 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4534 + htab->elf.sgotplt->output_offset
4535 + got_offset);
4536 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4537 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4538 loc + sizeof (Elf32_External_Rel));
4539 }
4540 }
4541 else
4542 {
4543 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4544 abed->plt->plt_entry_size);
4545 bfd_put_32 (output_bfd, got_offset,
4546 plt->contents + h->plt.offset
4547 + abed->plt->plt_got_offset);
4548 }
4549
4550 /* Fill in the entry in the global offset table. */
4551 bfd_put_32 (output_bfd,
4552 (plt->output_section->vma
4553 + plt->output_offset
4554 + h->plt.offset
4555 + abed->plt->plt_lazy_offset),
4556 gotplt->contents + got_offset);
4557
4558 /* Fill in the entry in the .rel.plt section. */
4559 rel.r_offset = (gotplt->output_section->vma
4560 + gotplt->output_offset
4561 + got_offset);
4562 if (h->dynindx == -1
4563 || ((info->executable
4564 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4565 && h->def_regular
4566 && h->type == STT_GNU_IFUNC))
4567 {
4568 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4569 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4570 in the .got.plt section. */
4571 bfd_put_32 (output_bfd,
4572 (h->root.u.def.value
4573 + h->root.u.def.section->output_section->vma
4574 + h->root.u.def.section->output_offset),
4575 gotplt->contents + got_offset);
4576 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4577 /* R_386_IRELATIVE comes last. */
4578 plt_index = htab->next_irelative_index--;
4579 }
4580 else
4581 {
4582 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4583 plt_index = htab->next_jump_slot_index++;
4584 }
4585 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4586 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4587
4588 /* Don't fill PLT entry for static executables. */
4589 if (plt == htab->elf.splt)
4590 {
4591 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4592 plt->contents + h->plt.offset
4593 + abed->plt->plt_reloc_offset);
4594 bfd_put_32 (output_bfd, - (h->plt.offset
4595 + abed->plt->plt_plt_offset + 4),
4596 plt->contents + h->plt.offset
4597 + abed->plt->plt_plt_offset);
4598 }
4599
4600 if (!h->def_regular)
4601 {
4602 /* Mark the symbol as undefined, rather than as defined in
4603 the .plt section. Leave the value if there were any
4604 relocations where pointer equality matters (this is a clue
4605 for the dynamic linker, to make function pointer
4606 comparisons work between an application and shared
4607 library), otherwise set it to zero. If a function is only
4608 called from a binary, there is no need to slow down
4609 shared libraries because of that. */
4610 sym->st_shndx = SHN_UNDEF;
4611 if (!h->pointer_equality_needed)
4612 sym->st_value = 0;
4613 }
4614 }
4615
4616 if (h->got.offset != (bfd_vma) -1
4617 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4618 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4619 {
4620 Elf_Internal_Rela rel;
4621
4622 /* This symbol has an entry in the global offset table. Set it
4623 up. */
4624
4625 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4626 abort ();
4627
4628 rel.r_offset = (htab->elf.sgot->output_section->vma
4629 + htab->elf.sgot->output_offset
4630 + (h->got.offset & ~(bfd_vma) 1));
4631
4632 /* If this is a static link, or it is a -Bsymbolic link and the
4633 symbol is defined locally or was forced to be local because
4634 of a version file, we just want to emit a RELATIVE reloc.
4635 The entry in the global offset table will already have been
4636 initialized in the relocate_section function. */
4637 if (h->def_regular
4638 && h->type == STT_GNU_IFUNC)
4639 {
4640 if (info->shared)
4641 {
4642 /* Generate R_386_GLOB_DAT. */
4643 goto do_glob_dat;
4644 }
4645 else
4646 {
4647 asection *plt;
4648
4649 if (!h->pointer_equality_needed)
4650 abort ();
4651
4652 /* For non-shared object, we can't use .got.plt, which
4653 contains the real function addres if we need pointer
4654 equality. We load the GOT entry with the PLT entry. */
4655 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4656 bfd_put_32 (output_bfd,
4657 (plt->output_section->vma
4658 + plt->output_offset + h->plt.offset),
4659 htab->elf.sgot->contents + h->got.offset);
4660 return TRUE;
4661 }
4662 }
4663 else if (info->shared
4664 && SYMBOL_REFERENCES_LOCAL (info, h))
4665 {
4666 BFD_ASSERT((h->got.offset & 1) != 0);
4667 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4668 }
4669 else
4670 {
4671 BFD_ASSERT((h->got.offset & 1) == 0);
4672 do_glob_dat:
4673 bfd_put_32 (output_bfd, (bfd_vma) 0,
4674 htab->elf.sgot->contents + h->got.offset);
4675 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4676 }
4677
4678 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4679 }
4680
4681 if (h->needs_copy)
4682 {
4683 Elf_Internal_Rela rel;
4684
4685 /* This symbol needs a copy reloc. Set it up. */
4686
4687 if (h->dynindx == -1
4688 || (h->root.type != bfd_link_hash_defined
4689 && h->root.type != bfd_link_hash_defweak)
4690 || htab->srelbss == NULL)
4691 abort ();
4692
4693 rel.r_offset = (h->root.u.def.value
4694 + h->root.u.def.section->output_section->vma
4695 + h->root.u.def.section->output_offset);
4696 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4697 elf_append_rel (output_bfd, htab->srelbss, &rel);
4698 }
4699
4700 return TRUE;
4701 }
4702
4703 /* Finish up local dynamic symbol handling. We set the contents of
4704 various dynamic sections here. */
4705
4706 static bfd_boolean
4707 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4708 {
4709 struct elf_link_hash_entry *h
4710 = (struct elf_link_hash_entry *) *slot;
4711 struct bfd_link_info *info
4712 = (struct bfd_link_info *) inf;
4713
4714 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4715 h, NULL);
4716 }
4717
4718 /* Used to decide how to sort relocs in an optimal manner for the
4719 dynamic linker, before writing them out. */
4720
4721 static enum elf_reloc_type_class
4722 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4723 const asection *rel_sec ATTRIBUTE_UNUSED,
4724 const Elf_Internal_Rela *rela)
4725 {
4726 switch (ELF32_R_TYPE (rela->r_info))
4727 {
4728 case R_386_RELATIVE:
4729 return reloc_class_relative;
4730 case R_386_JUMP_SLOT:
4731 return reloc_class_plt;
4732 case R_386_COPY:
4733 return reloc_class_copy;
4734 default:
4735 return reloc_class_normal;
4736 }
4737 }
4738
4739 /* Finish up the dynamic sections. */
4740
4741 static bfd_boolean
4742 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4743 struct bfd_link_info *info)
4744 {
4745 struct elf_i386_link_hash_table *htab;
4746 bfd *dynobj;
4747 asection *sdyn;
4748 const struct elf_i386_backend_data *abed;
4749
4750 htab = elf_i386_hash_table (info);
4751 if (htab == NULL)
4752 return FALSE;
4753
4754 dynobj = htab->elf.dynobj;
4755 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4756 abed = get_elf_i386_backend_data (output_bfd);
4757
4758 if (htab->elf.dynamic_sections_created)
4759 {
4760 Elf32_External_Dyn *dyncon, *dynconend;
4761
4762 if (sdyn == NULL || htab->elf.sgot == NULL)
4763 abort ();
4764
4765 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4766 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4767 for (; dyncon < dynconend; dyncon++)
4768 {
4769 Elf_Internal_Dyn dyn;
4770 asection *s;
4771
4772 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4773
4774 switch (dyn.d_tag)
4775 {
4776 default:
4777 if (abed->is_vxworks
4778 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4779 break;
4780 continue;
4781
4782 case DT_PLTGOT:
4783 s = htab->elf.sgotplt;
4784 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4785 break;
4786
4787 case DT_JMPREL:
4788 s = htab->elf.srelplt;
4789 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4790 break;
4791
4792 case DT_PLTRELSZ:
4793 s = htab->elf.srelplt;
4794 dyn.d_un.d_val = s->size;
4795 break;
4796
4797 case DT_RELSZ:
4798 /* My reading of the SVR4 ABI indicates that the
4799 procedure linkage table relocs (DT_JMPREL) should be
4800 included in the overall relocs (DT_REL). This is
4801 what Solaris does. However, UnixWare can not handle
4802 that case. Therefore, we override the DT_RELSZ entry
4803 here to make it not include the JMPREL relocs. */
4804 s = htab->elf.srelplt;
4805 if (s == NULL)
4806 continue;
4807 dyn.d_un.d_val -= s->size;
4808 break;
4809
4810 case DT_REL:
4811 /* We may not be using the standard ELF linker script.
4812 If .rel.plt is the first .rel section, we adjust
4813 DT_REL to not include it. */
4814 s = htab->elf.srelplt;
4815 if (s == NULL)
4816 continue;
4817 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4818 continue;
4819 dyn.d_un.d_ptr += s->size;
4820 break;
4821 }
4822
4823 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4824 }
4825
4826 /* Fill in the first entry in the procedure linkage table. */
4827 if (htab->elf.splt && htab->elf.splt->size > 0)
4828 {
4829 if (info->shared)
4830 {
4831 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4832 abed->plt->plt0_entry_size);
4833 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4834 abed->plt0_pad_byte,
4835 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4836 }
4837 else
4838 {
4839 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4840 abed->plt->plt0_entry_size);
4841 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4842 abed->plt0_pad_byte,
4843 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4844 bfd_put_32 (output_bfd,
4845 (htab->elf.sgotplt->output_section->vma
4846 + htab->elf.sgotplt->output_offset
4847 + 4),
4848 htab->elf.splt->contents
4849 + abed->plt->plt0_got1_offset);
4850 bfd_put_32 (output_bfd,
4851 (htab->elf.sgotplt->output_section->vma
4852 + htab->elf.sgotplt->output_offset
4853 + 8),
4854 htab->elf.splt->contents
4855 + abed->plt->plt0_got2_offset);
4856
4857 if (abed->is_vxworks)
4858 {
4859 Elf_Internal_Rela rel;
4860
4861 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4862 On IA32 we use REL relocations so the addend goes in
4863 the PLT directly. */
4864 rel.r_offset = (htab->elf.splt->output_section->vma
4865 + htab->elf.splt->output_offset
4866 + abed->plt->plt0_got1_offset);
4867 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4868 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4869 htab->srelplt2->contents);
4870 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4871 rel.r_offset = (htab->elf.splt->output_section->vma
4872 + htab->elf.splt->output_offset
4873 + abed->plt->plt0_got2_offset);
4874 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4875 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4876 htab->srelplt2->contents +
4877 sizeof (Elf32_External_Rel));
4878 }
4879 }
4880
4881 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4882 really seem like the right value. */
4883 elf_section_data (htab->elf.splt->output_section)
4884 ->this_hdr.sh_entsize = 4;
4885
4886 /* Correct the .rel.plt.unloaded relocations. */
4887 if (abed->is_vxworks && !info->shared)
4888 {
4889 int num_plts = (htab->elf.splt->size
4890 / abed->plt->plt_entry_size) - 1;
4891 unsigned char *p;
4892
4893 p = htab->srelplt2->contents;
4894 if (info->shared)
4895 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4896 else
4897 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4898
4899 for (; num_plts; num_plts--)
4900 {
4901 Elf_Internal_Rela rel;
4902 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4903 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4904 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4905 p += sizeof (Elf32_External_Rel);
4906
4907 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4908 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4909 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4910 p += sizeof (Elf32_External_Rel);
4911 }
4912 }
4913 }
4914 }
4915
4916 if (htab->elf.sgotplt)
4917 {
4918 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4919 {
4920 (*_bfd_error_handler)
4921 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4922 return FALSE;
4923 }
4924
4925 /* Fill in the first three entries in the global offset table. */
4926 if (htab->elf.sgotplt->size > 0)
4927 {
4928 bfd_put_32 (output_bfd,
4929 (sdyn == NULL ? 0
4930 : sdyn->output_section->vma + sdyn->output_offset),
4931 htab->elf.sgotplt->contents);
4932 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4933 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4934 }
4935
4936 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4937 }
4938
4939 /* Adjust .eh_frame for .plt section. */
4940 if (htab->plt_eh_frame != NULL
4941 && htab->plt_eh_frame->contents != NULL)
4942 {
4943 if (htab->elf.splt != NULL
4944 && htab->elf.splt->size != 0
4945 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4946 && htab->elf.splt->output_section != NULL
4947 && htab->plt_eh_frame->output_section != NULL)
4948 {
4949 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4950 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4951 + htab->plt_eh_frame->output_offset
4952 + PLT_FDE_START_OFFSET;
4953 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4954 htab->plt_eh_frame->contents
4955 + PLT_FDE_START_OFFSET);
4956 }
4957 if (htab->plt_eh_frame->sec_info_type
4958 == SEC_INFO_TYPE_EH_FRAME)
4959 {
4960 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4961 htab->plt_eh_frame,
4962 htab->plt_eh_frame->contents))
4963 return FALSE;
4964 }
4965 }
4966
4967 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4968 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4969
4970 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4971 htab_traverse (htab->loc_hash_table,
4972 elf_i386_finish_local_dynamic_symbol,
4973 info);
4974
4975 return TRUE;
4976 }
4977
4978 /* Return address for Ith PLT stub in section PLT, for relocation REL
4979 or (bfd_vma) -1 if it should not be included. */
4980
4981 static bfd_vma
4982 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4983 const arelent *rel ATTRIBUTE_UNUSED)
4984 {
4985 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4986 }
4987
4988 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4989
4990 static bfd_boolean
4991 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4992 {
4993 if (h->plt.offset != (bfd_vma) -1
4994 && !h->def_regular
4995 && !h->pointer_equality_needed)
4996 return FALSE;
4997
4998 return _bfd_elf_hash_symbol (h);
4999 }
5000
5001 /* Hook called by the linker routine which adds symbols from an object
5002 file. */
5003
5004 static bfd_boolean
5005 elf_i386_add_symbol_hook (bfd * abfd,
5006 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5007 Elf_Internal_Sym * sym,
5008 const char ** namep ATTRIBUTE_UNUSED,
5009 flagword * flagsp ATTRIBUTE_UNUSED,
5010 asection ** secp ATTRIBUTE_UNUSED,
5011 bfd_vma * valp ATTRIBUTE_UNUSED)
5012 {
5013 if ((abfd->flags & DYNAMIC) == 0
5014 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5015 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5016 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5017
5018 return TRUE;
5019 }
5020
5021 #define TARGET_LITTLE_SYM i386_elf32_vec
5022 #define TARGET_LITTLE_NAME "elf32-i386"
5023 #define ELF_ARCH bfd_arch_i386
5024 #define ELF_TARGET_ID I386_ELF_DATA
5025 #define ELF_MACHINE_CODE EM_386
5026 #define ELF_MAXPAGESIZE 0x1000
5027
5028 #define elf_backend_can_gc_sections 1
5029 #define elf_backend_can_refcount 1
5030 #define elf_backend_want_got_plt 1
5031 #define elf_backend_plt_readonly 1
5032 #define elf_backend_want_plt_sym 0
5033 #define elf_backend_got_header_size 12
5034 #define elf_backend_plt_alignment 4
5035
5036 /* Support RELA for objdump of prelink objects. */
5037 #define elf_info_to_howto elf_i386_info_to_howto_rel
5038 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5039
5040 #define bfd_elf32_mkobject elf_i386_mkobject
5041
5042 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5043 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5044 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5045 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5046 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5047
5048 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5049 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5050 #define elf_backend_check_relocs elf_i386_check_relocs
5051 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5052 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5053 #define elf_backend_fake_sections elf_i386_fake_sections
5054 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5055 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5056 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5057 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5058 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5059 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5060 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5061 #define elf_backend_relocate_section elf_i386_relocate_section
5062 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5063 #define elf_backend_always_size_sections elf_i386_always_size_sections
5064 #define elf_backend_omit_section_dynsym \
5065 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5066 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5067 #define elf_backend_hash_symbol elf_i386_hash_symbol
5068 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5069
5070 #include "elf32-target.h"
5071
5072 /* FreeBSD support. */
5073
5074 #undef TARGET_LITTLE_SYM
5075 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5076 #undef TARGET_LITTLE_NAME
5077 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5078 #undef ELF_OSABI
5079 #define ELF_OSABI ELFOSABI_FREEBSD
5080
5081 /* The kernel recognizes executables as valid only if they carry a
5082 "FreeBSD" label in the ELF header. So we put this label on all
5083 executables and (for simplicity) also all other object files. */
5084
5085 static void
5086 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5087 {
5088 _bfd_elf_post_process_headers (abfd, info);
5089
5090 #ifdef OLD_FREEBSD_ABI_LABEL
5091 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5092 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5093 #endif
5094 }
5095
5096 #undef elf_backend_post_process_headers
5097 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5098 #undef elf32_bed
5099 #define elf32_bed elf32_i386_fbsd_bed
5100
5101 #undef elf_backend_add_symbol_hook
5102
5103 #include "elf32-target.h"
5104
5105 /* Solaris 2. */
5106
5107 #undef TARGET_LITTLE_SYM
5108 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5109 #undef TARGET_LITTLE_NAME
5110 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5111
5112 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5113 objects won't be recognized. */
5114 #undef ELF_OSABI
5115
5116 #undef elf32_bed
5117 #define elf32_bed elf32_i386_sol2_bed
5118
5119 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5120 boundary. */
5121 #undef elf_backend_static_tls_alignment
5122 #define elf_backend_static_tls_alignment 8
5123
5124 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5125
5126 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5127 File, p.63. */
5128 #undef elf_backend_want_plt_sym
5129 #define elf_backend_want_plt_sym 1
5130
5131 #include "elf32-target.h"
5132
5133 /* Native Client support. */
5134
5135 #undef TARGET_LITTLE_SYM
5136 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5137 #undef TARGET_LITTLE_NAME
5138 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5139 #undef elf32_bed
5140 #define elf32_bed elf32_i386_nacl_bed
5141
5142 #undef ELF_MAXPAGESIZE
5143 #define ELF_MAXPAGESIZE 0x10000
5144
5145 /* Restore defaults. */
5146 #undef ELF_OSABI
5147 #undef elf_backend_want_plt_sym
5148 #define elf_backend_want_plt_sym 0
5149 #undef elf_backend_post_process_headers
5150 #undef elf_backend_static_tls_alignment
5151
5152 /* NaCl uses substantially different PLT entries for the same effects. */
5153
5154 #undef elf_backend_plt_alignment
5155 #define elf_backend_plt_alignment 5
5156 #define NACL_PLT_ENTRY_SIZE 64
5157 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5158
5159 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5160 {
5161 0xff, 0x35, /* pushl contents of address */
5162 0, 0, 0, 0, /* replaced with address of .got + 4. */
5163 0x8b, 0x0d, /* movl contents of address, %ecx */
5164 0, 0, 0, 0, /* replaced with address of .got + 8. */
5165 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5166 0xff, 0xe1 /* jmp *%ecx */
5167 };
5168
5169 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5170 {
5171 0x8b, 0x0d, /* movl contents of address, %ecx */
5172 0, 0, 0, 0, /* replaced with GOT slot address. */
5173 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5174 0xff, 0xe1, /* jmp *%ecx */
5175
5176 /* Pad to the next 32-byte boundary with nop instructions. */
5177 0x90,
5178 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5179 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5180
5181 /* Lazy GOT entries point here (32-byte aligned). */
5182 0x68, /* pushl immediate */
5183 0, 0, 0, 0, /* replaced with reloc offset. */
5184 0xe9, /* jmp relative */
5185 0, 0, 0, 0, /* replaced with offset to .plt. */
5186
5187 /* Pad to the next 32-byte boundary with nop instructions. */
5188 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5189 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5190 0x90, 0x90
5191 };
5192
5193 static const bfd_byte
5194 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5195 {
5196 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5197 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5198 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5199 0xff, 0xe1, /* jmp *%ecx */
5200
5201 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5202 so pad to that size with nop instructions. */
5203 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5204 };
5205
5206 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5207 {
5208 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5209 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5210 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5211 0xff, 0xe1, /* jmp *%ecx */
5212
5213 /* Pad to the next 32-byte boundary with nop instructions. */
5214 0x90,
5215 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5216 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5217
5218 /* Lazy GOT entries point here (32-byte aligned). */
5219 0x68, /* pushl immediate */
5220 0, 0, 0, 0, /* replaced with offset into relocation table. */
5221 0xe9, /* jmp relative */
5222 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5223
5224 /* Pad to the next 32-byte boundary with nop instructions. */
5225 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5226 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5227 0x90, 0x90
5228 };
5229
5230 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5231 {
5232 #if (PLT_CIE_LENGTH != 20 \
5233 || PLT_FDE_LENGTH != 36 \
5234 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5235 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5236 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5237 #endif
5238 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5239 0, 0, 0, 0, /* CIE ID */
5240 1, /* CIE version */
5241 'z', 'R', 0, /* Augmentation string */
5242 1, /* Code alignment factor */
5243 0x7c, /* Data alignment factor: -4 */
5244 8, /* Return address column */
5245 1, /* Augmentation size */
5246 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5247 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5248 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5249 DW_CFA_nop, DW_CFA_nop,
5250
5251 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5252 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5253 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5254 0, 0, 0, 0, /* .plt size goes here */
5255 0, /* Augmentation size */
5256 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5257 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5258 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5259 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5260 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5261 13, /* Block length */
5262 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5263 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5264 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5265 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5266 DW_CFA_nop, DW_CFA_nop
5267 };
5268
5269 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5270 {
5271 elf_i386_nacl_plt0_entry, /* plt0_entry */
5272 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5273 2, /* plt0_got1_offset */
5274 8, /* plt0_got2_offset */
5275 elf_i386_nacl_plt_entry, /* plt_entry */
5276 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5277 2, /* plt_got_offset */
5278 33, /* plt_reloc_offset */
5279 38, /* plt_plt_offset */
5280 32, /* plt_lazy_offset */
5281 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5282 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5283 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5284 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5285 };
5286
5287 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5288 {
5289 &elf_i386_nacl_plt, /* plt */
5290 0x90, /* plt0_pad_byte: nop insn */
5291 0, /* is_vxworks */
5292 };
5293
5294 static bfd_boolean
5295 elf32_i386_nacl_elf_object_p (bfd *abfd)
5296 {
5297 /* Set the right machine number for a NaCl i386 ELF32 file. */
5298 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5299 return TRUE;
5300 }
5301
5302 #undef elf_backend_arch_data
5303 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5304
5305 #undef elf_backend_object_p
5306 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5307 #undef elf_backend_modify_segment_map
5308 #define elf_backend_modify_segment_map nacl_modify_segment_map
5309 #undef elf_backend_modify_program_headers
5310 #define elf_backend_modify_program_headers nacl_modify_program_headers
5311 #undef elf_backend_final_write_processing
5312 #define elf_backend_final_write_processing nacl_final_write_processing
5313
5314 #include "elf32-target.h"
5315
5316 /* Restore defaults. */
5317 #undef elf_backend_object_p
5318 #undef elf_backend_modify_segment_map
5319 #undef elf_backend_modify_program_headers
5320 #undef elf_backend_final_write_processing
5321
5322 /* VxWorks support. */
5323
5324 #undef TARGET_LITTLE_SYM
5325 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5326 #undef TARGET_LITTLE_NAME
5327 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5328 #undef ELF_OSABI
5329 #undef elf_backend_plt_alignment
5330 #define elf_backend_plt_alignment 4
5331
5332 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5333 {
5334 &elf_i386_plt, /* plt */
5335 0x90, /* plt0_pad_byte */
5336 1, /* is_vxworks */
5337 };
5338
5339 #undef elf_backend_arch_data
5340 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5341
5342 #undef elf_backend_relocs_compatible
5343 #undef elf_backend_add_symbol_hook
5344 #define elf_backend_add_symbol_hook \
5345 elf_vxworks_add_symbol_hook
5346 #undef elf_backend_link_output_symbol_hook
5347 #define elf_backend_link_output_symbol_hook \
5348 elf_vxworks_link_output_symbol_hook
5349 #undef elf_backend_emit_relocs
5350 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5351 #undef elf_backend_final_write_processing
5352 #define elf_backend_final_write_processing \
5353 elf_vxworks_final_write_processing
5354 #undef elf_backend_static_tls_alignment
5355
5356 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5357 define it. */
5358 #undef elf_backend_want_plt_sym
5359 #define elf_backend_want_plt_sym 1
5360
5361 #undef elf32_bed
5362 #define elf32_bed elf32_i386_vxworks_bed
5363
5364 #include "elf32-target.h"
GDB Binutils - Deliverables
This page took 0.195914 seconds and 5 git commands to generate.