Don't generate PLT relocations for now binding
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 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, 3, 0, FALSE, 0, complain_overflow_dont,
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 /* PR 17512: file: 0f67f69d. */
383 if (elf_howto_table [indx].type != r_type)
384 return NULL;
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* Entries in the GOT procedure linkage table look like this. */
586
587 static const bfd_byte elf_i386_got_plt_entry[8] =
588 {
589 0xff, 0x25, /* jmp indirect */
590 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
591 0x66, 0x90 /* xchg %ax,%ax */
592 };
593
594 /* Entries in the PIC GOT procedure linkage table look like this. */
595
596 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
597 {
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* .eh_frame covering the .plt section. */
604
605 static const bfd_byte elf_i386_eh_frame_plt[] =
606 {
607 #define PLT_CIE_LENGTH 20
608 #define PLT_FDE_LENGTH 36
609 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
610 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
611 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
612 0, 0, 0, 0, /* CIE ID */
613 1, /* CIE version */
614 'z', 'R', 0, /* Augmentation string */
615 1, /* Code alignment factor */
616 0x7c, /* Data alignment factor */
617 8, /* Return address column */
618 1, /* Augmentation size */
619 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
620 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
621 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
622 DW_CFA_nop, DW_CFA_nop,
623
624 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
625 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
626 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
627 0, 0, 0, 0, /* .plt size goes here */
628 0, /* Augmentation size */
629 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
630 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
631 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
632 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
633 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
634 11, /* Block length */
635 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
636 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
637 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
638 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
639 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
640 };
641
642 struct elf_i386_plt_layout
643 {
644 /* The first entry in an absolute procedure linkage table looks like this. */
645 const bfd_byte *plt0_entry;
646 unsigned int plt0_entry_size;
647
648 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
649 unsigned int plt0_got1_offset;
650 unsigned int plt0_got2_offset;
651
652 /* Later entries in an absolute procedure linkage table look like this. */
653 const bfd_byte *plt_entry;
654 unsigned int plt_entry_size;
655
656 /* Offsets into plt_entry that are to be replaced with... */
657 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
658 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
659 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
660
661 /* Offset into plt_entry where the initial value of the GOT entry points. */
662 unsigned int plt_lazy_offset;
663
664 /* The first entry in a PIC procedure linkage table looks like this. */
665 const bfd_byte *pic_plt0_entry;
666
667 /* Subsequent entries in a PIC procedure linkage table look like this. */
668 const bfd_byte *pic_plt_entry;
669
670 /* .eh_frame covering the .plt section. */
671 const bfd_byte *eh_frame_plt;
672 unsigned int eh_frame_plt_size;
673 };
674
675 #define GET_PLT_ENTRY_SIZE(abfd) \
676 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
677
678 /* These are the standard parameters. */
679 static const struct elf_i386_plt_layout elf_i386_plt =
680 {
681 elf_i386_plt0_entry, /* plt0_entry */
682 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
683 2, /* plt0_got1_offset */
684 8, /* plt0_got2_offset */
685 elf_i386_plt_entry, /* plt_entry */
686 PLT_ENTRY_SIZE, /* plt_entry_size */
687 2, /* plt_got_offset */
688 7, /* plt_reloc_offset */
689 12, /* plt_plt_offset */
690 6, /* plt_lazy_offset */
691 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
692 elf_i386_pic_plt_entry, /* pic_plt_entry */
693 elf_i386_eh_frame_plt, /* eh_frame_plt */
694 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
695 };
696 \f
697
698 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
699 for the PLTResolve stub and then for each PLT entry. */
700 #define PLTRESOLVE_RELOCS_SHLIB 0
701 #define PLTRESOLVE_RELOCS 2
702 #define PLT_NON_JUMP_SLOT_RELOCS 2
703
704 /* Architecture-specific backend data for i386. */
705
706 struct elf_i386_backend_data
707 {
708 /* Parameters describing PLT generation. */
709 const struct elf_i386_plt_layout *plt;
710
711 /* Value used to fill the unused bytes of the first PLT entry. */
712 bfd_byte plt0_pad_byte;
713
714 /* True if the target system is VxWorks. */
715 int is_vxworks;
716 };
717
718 #define get_elf_i386_backend_data(abfd) \
719 ((const struct elf_i386_backend_data *) \
720 get_elf_backend_data (abfd)->arch_data)
721
722 /* These are the standard parameters. */
723 static const struct elf_i386_backend_data elf_i386_arch_bed =
724 {
725 &elf_i386_plt, /* plt */
726 0, /* plt0_pad_byte */
727 0, /* is_vxworks */
728 };
729
730 #define elf_backend_arch_data &elf_i386_arch_bed
731
732 /* i386 ELF linker hash entry. */
733
734 struct elf_i386_link_hash_entry
735 {
736 struct elf_link_hash_entry elf;
737
738 /* Track dynamic relocs copied for this symbol. */
739 struct elf_dyn_relocs *dyn_relocs;
740
741 #define GOT_UNKNOWN 0
742 #define GOT_NORMAL 1
743 #define GOT_TLS_GD 2
744 #define GOT_TLS_IE 4
745 #define GOT_TLS_IE_POS 5
746 #define GOT_TLS_IE_NEG 6
747 #define GOT_TLS_IE_BOTH 7
748 #define GOT_TLS_GDESC 8
749 #define GOT_TLS_GD_BOTH_P(type) \
750 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
751 #define GOT_TLS_GD_P(type) \
752 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
753 #define GOT_TLS_GDESC_P(type) \
754 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
755 #define GOT_TLS_GD_ANY_P(type) \
756 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
757 unsigned char tls_type;
758
759 /* Symbol is referenced by R_386_GOTOFF relocation. */
760 unsigned int gotoff_ref : 1;
761
762 /* Information about the GOT PLT entry. Filled when there are both
763 GOT and PLT relocations against the same function. */
764 union gotplt_union plt_got;
765
766 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
767 starting at the end of the jump table. */
768 bfd_vma tlsdesc_got;
769 };
770
771 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
772
773 struct elf_i386_obj_tdata
774 {
775 struct elf_obj_tdata root;
776
777 /* tls_type for each local got entry. */
778 char *local_got_tls_type;
779
780 /* GOTPLT entries for TLS descriptors. */
781 bfd_vma *local_tlsdesc_gotent;
782 };
783
784 #define elf_i386_tdata(abfd) \
785 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
786
787 #define elf_i386_local_got_tls_type(abfd) \
788 (elf_i386_tdata (abfd)->local_got_tls_type)
789
790 #define elf_i386_local_tlsdesc_gotent(abfd) \
791 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
792
793 #define is_i386_elf(bfd) \
794 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
795 && elf_tdata (bfd) != NULL \
796 && elf_object_id (bfd) == I386_ELF_DATA)
797
798 static bfd_boolean
799 elf_i386_mkobject (bfd *abfd)
800 {
801 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
802 I386_ELF_DATA);
803 }
804
805 /* i386 ELF linker hash table. */
806
807 struct elf_i386_link_hash_table
808 {
809 struct elf_link_hash_table elf;
810
811 /* Short-cuts to get to dynamic linker sections. */
812 asection *sdynbss;
813 asection *srelbss;
814 asection *plt_eh_frame;
815 asection *plt_got;
816
817 union
818 {
819 bfd_signed_vma refcount;
820 bfd_vma offset;
821 } tls_ldm_got;
822
823 /* The amount of space used by the reserved portion of the sgotplt
824 section, plus whatever space is used by the jump slots. */
825 bfd_vma sgotplt_jump_table_size;
826
827 /* Small local sym cache. */
828 struct sym_cache sym_cache;
829
830 /* _TLS_MODULE_BASE_ symbol. */
831 struct bfd_link_hash_entry *tls_module_base;
832
833 /* Used by local STT_GNU_IFUNC symbols. */
834 htab_t loc_hash_table;
835 void * loc_hash_memory;
836
837 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
838 asection *srelplt2;
839
840 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
841 bfd_vma next_tls_desc_index;
842
843 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
844 bfd_vma next_jump_slot_index;
845
846 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
847 bfd_vma next_irelative_index;
848 };
849
850 /* Get the i386 ELF linker hash table from a link_info structure. */
851
852 #define elf_i386_hash_table(p) \
853 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
854 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
855
856 #define elf_i386_compute_jump_table_size(htab) \
857 ((htab)->elf.srelplt->reloc_count * 4)
858
859 /* Create an entry in an i386 ELF linker hash table. */
860
861 static struct bfd_hash_entry *
862 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
863 struct bfd_hash_table *table,
864 const char *string)
865 {
866 /* Allocate the structure if it has not already been allocated by a
867 subclass. */
868 if (entry == NULL)
869 {
870 entry = (struct bfd_hash_entry *)
871 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
872 if (entry == NULL)
873 return entry;
874 }
875
876 /* Call the allocation method of the superclass. */
877 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
878 if (entry != NULL)
879 {
880 struct elf_i386_link_hash_entry *eh;
881
882 eh = (struct elf_i386_link_hash_entry *) entry;
883 eh->dyn_relocs = NULL;
884 eh->tls_type = GOT_UNKNOWN;
885 eh->gotoff_ref = 0;
886 eh->plt_got.offset = (bfd_vma) -1;
887 eh->tlsdesc_got = (bfd_vma) -1;
888 }
889
890 return entry;
891 }
892
893 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
894 for local symbol so that we can handle local STT_GNU_IFUNC symbols
895 as global symbol. We reuse indx and dynstr_index for local symbol
896 hash since they aren't used by global symbols in this backend. */
897
898 static hashval_t
899 elf_i386_local_htab_hash (const void *ptr)
900 {
901 struct elf_link_hash_entry *h
902 = (struct elf_link_hash_entry *) ptr;
903 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
904 }
905
906 /* Compare local hash entries. */
907
908 static int
909 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
910 {
911 struct elf_link_hash_entry *h1
912 = (struct elf_link_hash_entry *) ptr1;
913 struct elf_link_hash_entry *h2
914 = (struct elf_link_hash_entry *) ptr2;
915
916 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
917 }
918
919 /* Find and/or create a hash entry for local symbol. */
920
921 static struct elf_link_hash_entry *
922 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
923 bfd *abfd, const Elf_Internal_Rela *rel,
924 bfd_boolean create)
925 {
926 struct elf_i386_link_hash_entry e, *ret;
927 asection *sec = abfd->sections;
928 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
929 ELF32_R_SYM (rel->r_info));
930 void **slot;
931
932 e.elf.indx = sec->id;
933 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
934 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
935 create ? INSERT : NO_INSERT);
936
937 if (!slot)
938 return NULL;
939
940 if (*slot)
941 {
942 ret = (struct elf_i386_link_hash_entry *) *slot;
943 return &ret->elf;
944 }
945
946 ret = (struct elf_i386_link_hash_entry *)
947 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
948 sizeof (struct elf_i386_link_hash_entry));
949 if (ret)
950 {
951 memset (ret, 0, sizeof (*ret));
952 ret->elf.indx = sec->id;
953 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
954 ret->elf.dynindx = -1;
955 ret->plt_got.offset = (bfd_vma) -1;
956 *slot = ret;
957 }
958 return &ret->elf;
959 }
960
961 /* Destroy an i386 ELF linker hash table. */
962
963 static void
964 elf_i386_link_hash_table_free (bfd *obfd)
965 {
966 struct elf_i386_link_hash_table *htab
967 = (struct elf_i386_link_hash_table *) obfd->link.hash;
968
969 if (htab->loc_hash_table)
970 htab_delete (htab->loc_hash_table);
971 if (htab->loc_hash_memory)
972 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
973 _bfd_elf_link_hash_table_free (obfd);
974 }
975
976 /* Create an i386 ELF linker hash table. */
977
978 static struct bfd_link_hash_table *
979 elf_i386_link_hash_table_create (bfd *abfd)
980 {
981 struct elf_i386_link_hash_table *ret;
982 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
983
984 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
985 if (ret == NULL)
986 return NULL;
987
988 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
989 elf_i386_link_hash_newfunc,
990 sizeof (struct elf_i386_link_hash_entry),
991 I386_ELF_DATA))
992 {
993 free (ret);
994 return NULL;
995 }
996
997 ret->loc_hash_table = htab_try_create (1024,
998 elf_i386_local_htab_hash,
999 elf_i386_local_htab_eq,
1000 NULL);
1001 ret->loc_hash_memory = objalloc_create ();
1002 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1003 {
1004 elf_i386_link_hash_table_free (abfd);
1005 return NULL;
1006 }
1007 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1008
1009 return &ret->elf.root;
1010 }
1011
1012 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1013 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1014 hash table. */
1015
1016 static bfd_boolean
1017 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1018 {
1019 struct elf_i386_link_hash_table *htab;
1020
1021 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1022 return FALSE;
1023
1024 htab = elf_i386_hash_table (info);
1025 if (htab == NULL)
1026 return FALSE;
1027
1028 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1029 if (!htab->sdynbss)
1030 abort ();
1031
1032 if (info->executable)
1033 {
1034 /* Always allow copy relocs for building executables. */
1035 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1036 if (s == NULL)
1037 {
1038 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1039 s = bfd_make_section_anyway_with_flags (dynobj,
1040 ".rel.bss",
1041 (bed->dynamic_sec_flags
1042 | SEC_READONLY));
1043 if (s == NULL
1044 || ! bfd_set_section_alignment (dynobj, s,
1045 bed->s->log_file_align))
1046 return FALSE;
1047 }
1048 htab->srelbss = s;
1049 }
1050
1051 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1052 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1053 &htab->srelplt2))
1054 return FALSE;
1055
1056 if (!info->no_ld_generated_unwind_info
1057 && htab->plt_eh_frame == NULL
1058 && htab->elf.splt != NULL)
1059 {
1060 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1061 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED);
1063 htab->plt_eh_frame
1064 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1065 if (htab->plt_eh_frame == NULL
1066 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1067 return FALSE;
1068 }
1069
1070 return TRUE;
1071 }
1072
1073 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1074
1075 static void
1076 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1077 struct elf_link_hash_entry *dir,
1078 struct elf_link_hash_entry *ind)
1079 {
1080 struct elf_i386_link_hash_entry *edir, *eind;
1081
1082 edir = (struct elf_i386_link_hash_entry *) dir;
1083 eind = (struct elf_i386_link_hash_entry *) ind;
1084
1085 if (eind->dyn_relocs != NULL)
1086 {
1087 if (edir->dyn_relocs != NULL)
1088 {
1089 struct elf_dyn_relocs **pp;
1090 struct elf_dyn_relocs *p;
1091
1092 /* Add reloc counts against the indirect sym to the direct sym
1093 list. Merge any entries against the same section. */
1094 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1095 {
1096 struct elf_dyn_relocs *q;
1097
1098 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1099 if (q->sec == p->sec)
1100 {
1101 q->pc_count += p->pc_count;
1102 q->count += p->count;
1103 *pp = p->next;
1104 break;
1105 }
1106 if (q == NULL)
1107 pp = &p->next;
1108 }
1109 *pp = edir->dyn_relocs;
1110 }
1111
1112 edir->dyn_relocs = eind->dyn_relocs;
1113 eind->dyn_relocs = NULL;
1114 }
1115
1116 if (ind->root.type == bfd_link_hash_indirect
1117 && dir->got.refcount <= 0)
1118 {
1119 edir->tls_type = eind->tls_type;
1120 eind->tls_type = GOT_UNKNOWN;
1121 }
1122
1123 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1124 generate a R_386_COPY reloc. */
1125 edir->gotoff_ref |= eind->gotoff_ref;
1126
1127 if (ELIMINATE_COPY_RELOCS
1128 && ind->root.type != bfd_link_hash_indirect
1129 && dir->dynamic_adjusted)
1130 {
1131 /* If called to transfer flags for a weakdef during processing
1132 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1133 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1134 dir->ref_dynamic |= ind->ref_dynamic;
1135 dir->ref_regular |= ind->ref_regular;
1136 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1137 dir->needs_plt |= ind->needs_plt;
1138 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1139 }
1140 else
1141 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1142 }
1143
1144 /* Return TRUE if the TLS access code sequence support transition
1145 from R_TYPE. */
1146
1147 static bfd_boolean
1148 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1149 bfd_byte *contents,
1150 Elf_Internal_Shdr *symtab_hdr,
1151 struct elf_link_hash_entry **sym_hashes,
1152 unsigned int r_type,
1153 const Elf_Internal_Rela *rel,
1154 const Elf_Internal_Rela *relend)
1155 {
1156 unsigned int val, type;
1157 unsigned long r_symndx;
1158 struct elf_link_hash_entry *h;
1159 bfd_vma offset;
1160
1161 /* Get the section contents. */
1162 if (contents == NULL)
1163 {
1164 if (elf_section_data (sec)->this_hdr.contents != NULL)
1165 contents = elf_section_data (sec)->this_hdr.contents;
1166 else
1167 {
1168 /* FIXME: How to better handle error condition? */
1169 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1170 return FALSE;
1171
1172 /* Cache the section contents for elf_link_input_bfd. */
1173 elf_section_data (sec)->this_hdr.contents = contents;
1174 }
1175 }
1176
1177 offset = rel->r_offset;
1178 switch (r_type)
1179 {
1180 case R_386_TLS_GD:
1181 case R_386_TLS_LDM:
1182 if (offset < 2 || (rel + 1) >= relend)
1183 return FALSE;
1184
1185 type = bfd_get_8 (abfd, contents + offset - 2);
1186 if (r_type == R_386_TLS_GD)
1187 {
1188 /* Check transition from GD access model. Only
1189 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1190 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1191 can transit to different access model. */
1192 if ((offset + 10) > sec->size ||
1193 (type != 0x8d && type != 0x04))
1194 return FALSE;
1195
1196 val = bfd_get_8 (abfd, contents + offset - 1);
1197 if (type == 0x04)
1198 {
1199 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1200 if (offset < 3)
1201 return FALSE;
1202
1203 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1204 return FALSE;
1205
1206 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1207 return FALSE;
1208 }
1209 else
1210 {
1211 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1212 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1213 return FALSE;
1214
1215 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1216 return FALSE;
1217 }
1218 }
1219 else
1220 {
1221 /* Check transition from LD access model. Only
1222 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1223 can transit to different access model. */
1224 if (type != 0x8d || (offset + 9) > sec->size)
1225 return FALSE;
1226
1227 val = bfd_get_8 (abfd, contents + offset - 1);
1228 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1229 return FALSE;
1230 }
1231
1232 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1233 return FALSE;
1234
1235 r_symndx = ELF32_R_SYM (rel[1].r_info);
1236 if (r_symndx < symtab_hdr->sh_info)
1237 return FALSE;
1238
1239 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1240 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1241 may be versioned. */
1242 return (h != NULL
1243 && h->root.root.string != NULL
1244 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1245 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1246 && (strncmp (h->root.root.string, "___tls_get_addr",
1247 15) == 0));
1248
1249 case R_386_TLS_IE:
1250 /* Check transition from IE access model:
1251 movl foo@indntpoff(%rip), %eax
1252 movl foo@indntpoff(%rip), %reg
1253 addl foo@indntpoff(%rip), %reg
1254 */
1255
1256 if (offset < 1 || (offset + 4) > sec->size)
1257 return FALSE;
1258
1259 /* Check "movl foo@tpoff(%rip), %eax" first. */
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1261 if (val == 0xa1)
1262 return TRUE;
1263
1264 if (offset < 2)
1265 return FALSE;
1266
1267 /* Check movl|addl foo@tpoff(%rip), %reg. */
1268 type = bfd_get_8 (abfd, contents + offset - 2);
1269 return ((type == 0x8b || type == 0x03)
1270 && (val & 0xc7) == 0x05);
1271
1272 case R_386_TLS_GOTIE:
1273 case R_386_TLS_IE_32:
1274 /* Check transition from {IE_32,GOTIE} access model:
1275 subl foo@{tpoff,gontoff}(%reg1), %reg2
1276 movl foo@{tpoff,gontoff}(%reg1), %reg2
1277 addl foo@{tpoff,gontoff}(%reg1), %reg2
1278 */
1279
1280 if (offset < 2 || (offset + 4) > sec->size)
1281 return FALSE;
1282
1283 val = bfd_get_8 (abfd, contents + offset - 1);
1284 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1285 return FALSE;
1286
1287 type = bfd_get_8 (abfd, contents + offset - 2);
1288 return type == 0x8b || type == 0x2b || type == 0x03;
1289
1290 case R_386_TLS_GOTDESC:
1291 /* Check transition from GDesc access model:
1292 leal x@tlsdesc(%ebx), %eax
1293
1294 Make sure it's a leal adding ebx to a 32-bit offset
1295 into any register, although it's probably almost always
1296 going to be eax. */
1297
1298 if (offset < 2 || (offset + 4) > sec->size)
1299 return FALSE;
1300
1301 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1302 return FALSE;
1303
1304 val = bfd_get_8 (abfd, contents + offset - 1);
1305 return (val & 0xc7) == 0x83;
1306
1307 case R_386_TLS_DESC_CALL:
1308 /* Check transition from GDesc access model:
1309 call *x@tlsdesc(%rax)
1310 */
1311 if (offset + 2 <= sec->size)
1312 {
1313 /* Make sure that it's a call *x@tlsdesc(%rax). */
1314 static const unsigned char call[] = { 0xff, 0x10 };
1315 return memcmp (contents + offset, call, 2) == 0;
1316 }
1317
1318 return FALSE;
1319
1320 default:
1321 abort ();
1322 }
1323 }
1324
1325 /* Return TRUE if the TLS access transition is OK or no transition
1326 will be performed. Update R_TYPE if there is a transition. */
1327
1328 static bfd_boolean
1329 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1330 asection *sec, bfd_byte *contents,
1331 Elf_Internal_Shdr *symtab_hdr,
1332 struct elf_link_hash_entry **sym_hashes,
1333 unsigned int *r_type, int tls_type,
1334 const Elf_Internal_Rela *rel,
1335 const Elf_Internal_Rela *relend,
1336 struct elf_link_hash_entry *h,
1337 unsigned long r_symndx)
1338 {
1339 unsigned int from_type = *r_type;
1340 unsigned int to_type = from_type;
1341 bfd_boolean check = TRUE;
1342
1343 /* Skip TLS transition for functions. */
1344 if (h != NULL
1345 && (h->type == STT_FUNC
1346 || h->type == STT_GNU_IFUNC))
1347 return TRUE;
1348
1349 switch (from_type)
1350 {
1351 case R_386_TLS_GD:
1352 case R_386_TLS_GOTDESC:
1353 case R_386_TLS_DESC_CALL:
1354 case R_386_TLS_IE_32:
1355 case R_386_TLS_IE:
1356 case R_386_TLS_GOTIE:
1357 if (info->executable)
1358 {
1359 if (h == NULL)
1360 to_type = R_386_TLS_LE_32;
1361 else if (from_type != R_386_TLS_IE
1362 && from_type != R_386_TLS_GOTIE)
1363 to_type = R_386_TLS_IE_32;
1364 }
1365
1366 /* When we are called from elf_i386_relocate_section, CONTENTS
1367 isn't NULL and there may be additional transitions based on
1368 TLS_TYPE. */
1369 if (contents != NULL)
1370 {
1371 unsigned int new_to_type = to_type;
1372
1373 if (info->executable
1374 && h != NULL
1375 && h->dynindx == -1
1376 && (tls_type & GOT_TLS_IE))
1377 new_to_type = R_386_TLS_LE_32;
1378
1379 if (to_type == R_386_TLS_GD
1380 || to_type == R_386_TLS_GOTDESC
1381 || to_type == R_386_TLS_DESC_CALL)
1382 {
1383 if (tls_type == GOT_TLS_IE_POS)
1384 new_to_type = R_386_TLS_GOTIE;
1385 else if (tls_type & GOT_TLS_IE)
1386 new_to_type = R_386_TLS_IE_32;
1387 }
1388
1389 /* We checked the transition before when we were called from
1390 elf_i386_check_relocs. We only want to check the new
1391 transition which hasn't been checked before. */
1392 check = new_to_type != to_type && from_type == to_type;
1393 to_type = new_to_type;
1394 }
1395
1396 break;
1397
1398 case R_386_TLS_LDM:
1399 if (info->executable)
1400 to_type = R_386_TLS_LE_32;
1401 break;
1402
1403 default:
1404 return TRUE;
1405 }
1406
1407 /* Return TRUE if there is no transition. */
1408 if (from_type == to_type)
1409 return TRUE;
1410
1411 /* Check if the transition can be performed. */
1412 if (check
1413 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1414 symtab_hdr, sym_hashes,
1415 from_type, rel, relend))
1416 {
1417 reloc_howto_type *from, *to;
1418 const char *name;
1419
1420 from = elf_i386_rtype_to_howto (abfd, from_type);
1421 to = elf_i386_rtype_to_howto (abfd, to_type);
1422
1423 if (h)
1424 name = h->root.root.string;
1425 else
1426 {
1427 struct elf_i386_link_hash_table *htab;
1428
1429 htab = elf_i386_hash_table (info);
1430 if (htab == NULL)
1431 name = "*unknown*";
1432 else
1433 {
1434 Elf_Internal_Sym *isym;
1435
1436 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1437 abfd, r_symndx);
1438 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1439 }
1440 }
1441
1442 (*_bfd_error_handler)
1443 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1444 "in section `%A' failed"),
1445 abfd, sec, from->name, to->name, name,
1446 (unsigned long) rel->r_offset);
1447 bfd_set_error (bfd_error_bad_value);
1448 return FALSE;
1449 }
1450
1451 *r_type = to_type;
1452 return TRUE;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define need_convert_mov_to_lea sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bfd_boolean
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_i386_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_boolean use_plt_got;
1476
1477 if (info->relocatable)
1478 return TRUE;
1479
1480 BFD_ASSERT (is_i386_elf (abfd));
1481
1482 htab = elf_i386_hash_table (info);
1483 if (htab == NULL)
1484 return FALSE;
1485
1486 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1487 && (get_elf_i386_backend_data (abfd)
1488 == &elf_i386_arch_bed));
1489
1490 symtab_hdr = &elf_symtab_hdr (abfd);
1491 sym_hashes = elf_sym_hashes (abfd);
1492
1493 sreloc = NULL;
1494
1495 rel_end = relocs + sec->reloc_count;
1496 for (rel = relocs; rel < rel_end; rel++)
1497 {
1498 unsigned int r_type;
1499 unsigned long r_symndx;
1500 struct elf_link_hash_entry *h;
1501 struct elf_i386_link_hash_entry *eh;
1502 Elf_Internal_Sym *isym;
1503 const char *name;
1504 bfd_boolean size_reloc;
1505
1506 r_symndx = ELF32_R_SYM (rel->r_info);
1507 r_type = ELF32_R_TYPE (rel->r_info);
1508
1509 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1510 {
1511 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1512 abfd,
1513 r_symndx);
1514 return FALSE;
1515 }
1516
1517 if (r_symndx < symtab_hdr->sh_info)
1518 {
1519 /* A local symbol. */
1520 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1521 abfd, r_symndx);
1522 if (isym == NULL)
1523 return FALSE;
1524
1525 /* Check relocation against local STT_GNU_IFUNC symbol. */
1526 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1527 {
1528 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1529 if (h == NULL)
1530 return FALSE;
1531
1532 /* Fake a STT_GNU_IFUNC symbol. */
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_i386_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 /* Create the ifunc sections for static executables. If we
1555 never see an indirect function symbol nor we are building
1556 a static executable, those sections will be empty and
1557 won't appear in output. */
1558 switch (r_type)
1559 {
1560 default:
1561 break;
1562
1563 case R_386_GOTOFF:
1564 eh->gotoff_ref = 1;
1565 case R_386_32:
1566 case R_386_PC32:
1567 case R_386_PLT32:
1568 case R_386_GOT32:
1569 if (htab->elf.dynobj == NULL)
1570 htab->elf.dynobj = abfd;
1571 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1572 return FALSE;
1573 break;
1574 }
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 h->root.non_ir_ref = 1;
1579 }
1580
1581 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1582 symtab_hdr, sym_hashes,
1583 &r_type, GOT_UNKNOWN,
1584 rel, rel_end, h, r_symndx))
1585 return FALSE;
1586
1587 switch (r_type)
1588 {
1589 case R_386_TLS_LDM:
1590 htab->tls_ldm_got.refcount += 1;
1591 goto create_got;
1592
1593 case R_386_PLT32:
1594 /* This symbol requires a procedure linkage table entry. We
1595 actually build the entry in adjust_dynamic_symbol,
1596 because this might be a case of linking PIC code which is
1597 never referenced by a dynamic object, in which case we
1598 don't need to generate a procedure linkage table entry
1599 after all. */
1600
1601 /* If this is a local symbol, we resolve it directly without
1602 creating a procedure linkage table entry. */
1603 if (h == NULL)
1604 continue;
1605
1606 h->needs_plt = 1;
1607 h->plt.refcount += 1;
1608 break;
1609
1610 case R_386_SIZE32:
1611 size_reloc = TRUE;
1612 goto do_size;
1613
1614 case R_386_TLS_IE_32:
1615 case R_386_TLS_IE:
1616 case R_386_TLS_GOTIE:
1617 if (!info->executable)
1618 info->flags |= DF_STATIC_TLS;
1619 /* Fall through */
1620
1621 case R_386_GOT32:
1622 case R_386_TLS_GD:
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1626 {
1627 int tls_type, old_tls_type;
1628
1629 switch (r_type)
1630 {
1631 default:
1632 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1640 else
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1644 break;
1645 case R_386_TLS_IE:
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1648 }
1649
1650 if (h != NULL)
1651 {
1652 h->got.refcount += 1;
1653 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1654 }
1655 else
1656 {
1657 bfd_signed_vma *local_got_refcounts;
1658
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1662 {
1663 bfd_size_type size;
1664
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1671 return FALSE;
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_i386_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_i386_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1677 }
1678 local_got_refcounts[r_symndx] += 1;
1679 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1680 }
1681
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1689 {
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1695 else
1696 {
1697 if (h)
1698 name = h->root.root.string;
1699 else
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1701 NULL);
1702 (*_bfd_error_handler)
1703 (_("%B: `%s' accessed both as normal and "
1704 "thread local symbol"),
1705 abfd, name);
1706 bfd_set_error (bfd_error_bad_value);
1707 return FALSE;
1708 }
1709 }
1710
1711 if (old_tls_type != tls_type)
1712 {
1713 if (h != NULL)
1714 elf_i386_hash_entry (h)->tls_type = tls_type;
1715 else
1716 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1717 }
1718 }
1719 /* Fall through */
1720
1721 case R_386_GOTOFF:
1722 case R_386_GOTPC:
1723 create_got:
1724 if (htab->elf.sgot == NULL)
1725 {
1726 if (htab->elf.dynobj == NULL)
1727 htab->elf.dynobj = abfd;
1728 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1729 return FALSE;
1730 }
1731 if (r_type != R_386_TLS_IE)
1732 break;
1733 /* Fall through */
1734
1735 case R_386_TLS_LE_32:
1736 case R_386_TLS_LE:
1737 if (info->executable)
1738 break;
1739 info->flags |= DF_STATIC_TLS;
1740 /* Fall through */
1741
1742 case R_386_32:
1743 case R_386_PC32:
1744 if (h != NULL && info->executable)
1745 {
1746 /* If this reloc is in a read-only section, we might
1747 need a copy reloc. We can't check reliably at this
1748 stage whether the section is read-only, as input
1749 sections have not yet been mapped to output sections.
1750 Tentatively set the flag for now, and correct in
1751 adjust_dynamic_symbol. */
1752 h->non_got_ref = 1;
1753
1754 /* We may need a .plt entry if the function this reloc
1755 refers to is in a shared lib. */
1756 h->plt.refcount += 1;
1757 if (r_type != R_386_PC32)
1758 h->pointer_equality_needed = 1;
1759 }
1760
1761 size_reloc = FALSE;
1762 do_size:
1763 /* If we are creating a shared library, and this is a reloc
1764 against a global symbol, or a non PC relative reloc
1765 against a local symbol, then we need to copy the reloc
1766 into the shared library. However, if we are linking with
1767 -Bsymbolic, we do not need to copy a reloc against a
1768 global symbol which is defined in an object we are
1769 including in the link (i.e., DEF_REGULAR is set). At
1770 this point we have not seen all the input files, so it is
1771 possible that DEF_REGULAR is not set now but will be set
1772 later (it is never cleared). In case of a weak definition,
1773 DEF_REGULAR may be cleared later by a strong definition in
1774 a shared library. We account for that possibility below by
1775 storing information in the relocs_copied field of the hash
1776 table entry. A similar situation occurs when creating
1777 shared libraries and symbol visibility changes render the
1778 symbol local.
1779
1780 If on the other hand, we are creating an executable, we
1781 may need to keep relocations for symbols satisfied by a
1782 dynamic library if we manage to avoid copy relocs for the
1783 symbol. */
1784 if ((info->shared
1785 && (sec->flags & SEC_ALLOC) != 0
1786 && (r_type != R_386_PC32
1787 || (h != NULL
1788 && (! SYMBOLIC_BIND (info, h)
1789 || h->root.type == bfd_link_hash_defweak
1790 || !h->def_regular))))
1791 || (ELIMINATE_COPY_RELOCS
1792 && !info->shared
1793 && (sec->flags & SEC_ALLOC) != 0
1794 && h != NULL
1795 && (h->root.type == bfd_link_hash_defweak
1796 || !h->def_regular)))
1797 {
1798 struct elf_dyn_relocs *p;
1799 struct elf_dyn_relocs **head;
1800
1801 /* We must copy these reloc types into the output file.
1802 Create a reloc section in dynobj and make room for
1803 this reloc. */
1804 if (sreloc == NULL)
1805 {
1806 if (htab->elf.dynobj == NULL)
1807 htab->elf.dynobj = abfd;
1808
1809 sreloc = _bfd_elf_make_dynamic_reloc_section
1810 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1811
1812 if (sreloc == NULL)
1813 return FALSE;
1814 }
1815
1816 /* If this is a global symbol, we count the number of
1817 relocations we need for this symbol. */
1818 if (h != NULL)
1819 {
1820 head = &eh->dyn_relocs;
1821 }
1822 else
1823 {
1824 /* Track dynamic relocs needed for local syms too.
1825 We really need local syms available to do this
1826 easily. Oh well. */
1827 void **vpp;
1828 asection *s;
1829
1830 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1831 abfd, r_symndx);
1832 if (isym == NULL)
1833 return FALSE;
1834
1835 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1836 if (s == NULL)
1837 s = sec;
1838
1839 vpp = &elf_section_data (s)->local_dynrel;
1840 head = (struct elf_dyn_relocs **)vpp;
1841 }
1842
1843 p = *head;
1844 if (p == NULL || p->sec != sec)
1845 {
1846 bfd_size_type amt = sizeof *p;
1847 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1848 amt);
1849 if (p == NULL)
1850 return FALSE;
1851 p->next = *head;
1852 *head = p;
1853 p->sec = sec;
1854 p->count = 0;
1855 p->pc_count = 0;
1856 }
1857
1858 p->count += 1;
1859 /* Count size relocation as PC-relative relocation. */
1860 if (r_type == R_386_PC32 || size_reloc)
1861 p->pc_count += 1;
1862 }
1863 break;
1864
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1869 return FALSE;
1870 break;
1871
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1876 if (h != NULL
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1878 return FALSE;
1879 break;
1880
1881 default:
1882 break;
1883 }
1884
1885 if (use_plt_got
1886 && h != NULL
1887 && h->plt.refcount > 0
1888 && ((info->flags & DF_BIND_NOW) || h->got.refcount > 0)
1889 && htab->plt_got == NULL)
1890 {
1891 /* Create the GOT procedure linkage table. */
1892 unsigned int plt_got_align;
1893 const struct elf_backend_data *bed;
1894
1895 bed = get_elf_backend_data (info->output_bfd);
1896 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1897 && (sizeof (elf_i386_got_plt_entry)
1898 == sizeof (elf_i386_pic_got_plt_entry)));
1899 plt_got_align = 3;
1900
1901 if (htab->elf.dynobj == NULL)
1902 htab->elf.dynobj = abfd;
1903 htab->plt_got
1904 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1905 ".plt.got",
1906 (bed->dynamic_sec_flags
1907 | SEC_ALLOC
1908 | SEC_CODE
1909 | SEC_LOAD
1910 | SEC_READONLY));
1911 if (htab->plt_got == NULL
1912 || !bfd_set_section_alignment (htab->elf.dynobj,
1913 htab->plt_got,
1914 plt_got_align))
1915 return FALSE;
1916 }
1917
1918 if (r_type == R_386_GOT32
1919 && (h == NULL || h->type != STT_GNU_IFUNC))
1920 sec->need_convert_mov_to_lea = 1;
1921 }
1922
1923 return TRUE;
1924 }
1925
1926 /* Return the section that should be marked against GC for a given
1927 relocation. */
1928
1929 static asection *
1930 elf_i386_gc_mark_hook (asection *sec,
1931 struct bfd_link_info *info,
1932 Elf_Internal_Rela *rel,
1933 struct elf_link_hash_entry *h,
1934 Elf_Internal_Sym *sym)
1935 {
1936 if (h != NULL)
1937 switch (ELF32_R_TYPE (rel->r_info))
1938 {
1939 case R_386_GNU_VTINHERIT:
1940 case R_386_GNU_VTENTRY:
1941 return NULL;
1942 }
1943
1944 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1945 }
1946
1947 /* Update the got entry reference counts for the section being removed. */
1948
1949 static bfd_boolean
1950 elf_i386_gc_sweep_hook (bfd *abfd,
1951 struct bfd_link_info *info,
1952 asection *sec,
1953 const Elf_Internal_Rela *relocs)
1954 {
1955 struct elf_i386_link_hash_table *htab;
1956 Elf_Internal_Shdr *symtab_hdr;
1957 struct elf_link_hash_entry **sym_hashes;
1958 bfd_signed_vma *local_got_refcounts;
1959 const Elf_Internal_Rela *rel, *relend;
1960
1961 if (info->relocatable)
1962 return TRUE;
1963
1964 htab = elf_i386_hash_table (info);
1965 if (htab == NULL)
1966 return FALSE;
1967
1968 elf_section_data (sec)->local_dynrel = NULL;
1969
1970 symtab_hdr = &elf_symtab_hdr (abfd);
1971 sym_hashes = elf_sym_hashes (abfd);
1972 local_got_refcounts = elf_local_got_refcounts (abfd);
1973
1974 relend = relocs + sec->reloc_count;
1975 for (rel = relocs; rel < relend; rel++)
1976 {
1977 unsigned long r_symndx;
1978 unsigned int r_type;
1979 struct elf_link_hash_entry *h = NULL;
1980
1981 r_symndx = ELF32_R_SYM (rel->r_info);
1982 if (r_symndx >= symtab_hdr->sh_info)
1983 {
1984 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1985 while (h->root.type == bfd_link_hash_indirect
1986 || h->root.type == bfd_link_hash_warning)
1987 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1988 }
1989 else
1990 {
1991 /* A local symbol. */
1992 Elf_Internal_Sym *isym;
1993
1994 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1995 abfd, r_symndx);
1996
1997 /* Check relocation against local STT_GNU_IFUNC symbol. */
1998 if (isym != NULL
1999 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2000 {
2001 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2002 if (h == NULL)
2003 abort ();
2004 }
2005 }
2006
2007 if (h)
2008 {
2009 struct elf_i386_link_hash_entry *eh;
2010 struct elf_dyn_relocs **pp;
2011 struct elf_dyn_relocs *p;
2012
2013 eh = (struct elf_i386_link_hash_entry *) h;
2014 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2015 if (p->sec == sec)
2016 {
2017 /* Everything must go for SEC. */
2018 *pp = p->next;
2019 break;
2020 }
2021 }
2022
2023 r_type = ELF32_R_TYPE (rel->r_info);
2024 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2025 symtab_hdr, sym_hashes,
2026 &r_type, GOT_UNKNOWN,
2027 rel, relend, h, r_symndx))
2028 return FALSE;
2029
2030 switch (r_type)
2031 {
2032 case R_386_TLS_LDM:
2033 if (htab->tls_ldm_got.refcount > 0)
2034 htab->tls_ldm_got.refcount -= 1;
2035 break;
2036
2037 case R_386_TLS_GD:
2038 case R_386_TLS_GOTDESC:
2039 case R_386_TLS_DESC_CALL:
2040 case R_386_TLS_IE_32:
2041 case R_386_TLS_IE:
2042 case R_386_TLS_GOTIE:
2043 case R_386_GOT32:
2044 if (h != NULL)
2045 {
2046 if (h->got.refcount > 0)
2047 h->got.refcount -= 1;
2048 if (h->type == STT_GNU_IFUNC)
2049 {
2050 if (h->plt.refcount > 0)
2051 h->plt.refcount -= 1;
2052 }
2053 }
2054 else if (local_got_refcounts != NULL)
2055 {
2056 if (local_got_refcounts[r_symndx] > 0)
2057 local_got_refcounts[r_symndx] -= 1;
2058 }
2059 break;
2060
2061 case R_386_32:
2062 case R_386_PC32:
2063 case R_386_SIZE32:
2064 if (info->shared
2065 && (h == NULL || h->type != STT_GNU_IFUNC))
2066 break;
2067 /* Fall through */
2068
2069 case R_386_PLT32:
2070 if (h != NULL)
2071 {
2072 if (h->plt.refcount > 0)
2073 h->plt.refcount -= 1;
2074 }
2075 break;
2076
2077 case R_386_GOTOFF:
2078 if (h != NULL && h->type == STT_GNU_IFUNC)
2079 {
2080 if (h->got.refcount > 0)
2081 h->got.refcount -= 1;
2082 if (h->plt.refcount > 0)
2083 h->plt.refcount -= 1;
2084 }
2085 break;
2086
2087 default:
2088 break;
2089 }
2090 }
2091
2092 return TRUE;
2093 }
2094
2095 /* Adjust a symbol defined by a dynamic object and referenced by a
2096 regular object. The current definition is in some section of the
2097 dynamic object, but we're not including those sections. We have to
2098 change the definition to something the rest of the link can
2099 understand. */
2100
2101 static bfd_boolean
2102 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2103 struct elf_link_hash_entry *h)
2104 {
2105 struct elf_i386_link_hash_table *htab;
2106 asection *s;
2107 struct elf_i386_link_hash_entry *eh;
2108 struct elf_dyn_relocs *p;
2109
2110 /* STT_GNU_IFUNC symbol must go through PLT. */
2111 if (h->type == STT_GNU_IFUNC)
2112 {
2113 /* All local STT_GNU_IFUNC references must be treate as local
2114 calls via local PLT. */
2115 if (h->ref_regular
2116 && SYMBOL_CALLS_LOCAL (info, h))
2117 {
2118 bfd_size_type pc_count = 0, count = 0;
2119 struct elf_dyn_relocs **pp;
2120
2121 eh = (struct elf_i386_link_hash_entry *) h;
2122 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2123 {
2124 pc_count += p->pc_count;
2125 p->count -= p->pc_count;
2126 p->pc_count = 0;
2127 count += p->count;
2128 if (p->count == 0)
2129 *pp = p->next;
2130 else
2131 pp = &p->next;
2132 }
2133
2134 if (pc_count || count)
2135 {
2136 h->needs_plt = 1;
2137 h->non_got_ref = 1;
2138 if (h->plt.refcount <= 0)
2139 h->plt.refcount = 1;
2140 else
2141 h->plt.refcount += 1;
2142 }
2143 }
2144
2145 if (h->plt.refcount <= 0)
2146 {
2147 h->plt.offset = (bfd_vma) -1;
2148 h->needs_plt = 0;
2149 }
2150 return TRUE;
2151 }
2152
2153 /* If this is a function, put it in the procedure linkage table. We
2154 will fill in the contents of the procedure linkage table later,
2155 when we know the address of the .got section. */
2156 if (h->type == STT_FUNC
2157 || h->needs_plt)
2158 {
2159 if (h->plt.refcount <= 0
2160 || SYMBOL_CALLS_LOCAL (info, h)
2161 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2162 && h->root.type == bfd_link_hash_undefweak))
2163 {
2164 /* This case can occur if we saw a PLT32 reloc in an input
2165 file, but the symbol was never referred to by a dynamic
2166 object, or if all references were garbage collected. In
2167 such a case, we don't actually need to build a procedure
2168 linkage table, and we can just do a PC32 reloc instead. */
2169 h->plt.offset = (bfd_vma) -1;
2170 h->needs_plt = 0;
2171 }
2172
2173 return TRUE;
2174 }
2175 else
2176 /* It's possible that we incorrectly decided a .plt reloc was
2177 needed for an R_386_PC32 reloc to a non-function sym in
2178 check_relocs. We can't decide accurately between function and
2179 non-function syms in check-relocs; Objects loaded later in
2180 the link may change h->type. So fix it now. */
2181 h->plt.offset = (bfd_vma) -1;
2182
2183 /* If this is a weak symbol, and there is a real definition, the
2184 processor independent code will have arranged for us to see the
2185 real definition first, and we can just use the same value. */
2186 if (h->u.weakdef != NULL)
2187 {
2188 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2189 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2190 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2191 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2192 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2193 h->non_got_ref = h->u.weakdef->non_got_ref;
2194 return TRUE;
2195 }
2196
2197 /* This is a reference to a symbol defined by a dynamic object which
2198 is not a function. */
2199
2200 /* If we are creating a shared library, we must presume that the
2201 only references to the symbol are via the global offset table.
2202 For such cases we need not do anything here; the relocations will
2203 be handled correctly by relocate_section. */
2204 if (!info->executable)
2205 return TRUE;
2206
2207 /* If there are no references to this symbol that do not use the
2208 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2209 reloc. */
2210 eh = (struct elf_i386_link_hash_entry *) h;
2211 if (!h->non_got_ref && !eh->gotoff_ref)
2212 return TRUE;
2213
2214 /* If -z nocopyreloc was given, we won't generate them either. */
2215 if (info->nocopyreloc)
2216 {
2217 h->non_got_ref = 0;
2218 return TRUE;
2219 }
2220
2221 htab = elf_i386_hash_table (info);
2222 if (htab == NULL)
2223 return FALSE;
2224
2225 /* If there aren't any dynamic relocs in read-only sections nor
2226 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2227 avoid the copy reloc. This doesn't work on VxWorks, where we can
2228 not have dynamic relocations (other than copy and jump slot
2229 relocations) in an executable. */
2230 if (ELIMINATE_COPY_RELOCS
2231 && !eh->gotoff_ref
2232 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2233 {
2234 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2235 {
2236 s = p->sec->output_section;
2237 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2238 break;
2239 }
2240
2241 if (p == NULL)
2242 {
2243 h->non_got_ref = 0;
2244 return TRUE;
2245 }
2246 }
2247
2248 /* We must allocate the symbol in our .dynbss section, which will
2249 become part of the .bss section of the executable. There will be
2250 an entry for this symbol in the .dynsym section. The dynamic
2251 object will contain position independent code, so all references
2252 from the dynamic object to this symbol will go through the global
2253 offset table. The dynamic linker will use the .dynsym entry to
2254 determine the address it must put in the global offset table, so
2255 both the dynamic object and the regular object will refer to the
2256 same memory location for the variable. */
2257
2258 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2259 copy the initial value out of the dynamic object and into the
2260 runtime process image. */
2261 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2262 {
2263 htab->srelbss->size += sizeof (Elf32_External_Rel);
2264 h->needs_copy = 1;
2265 }
2266
2267 s = htab->sdynbss;
2268
2269 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2270 }
2271
2272 /* Allocate space in .plt, .got and associated reloc sections for
2273 dynamic relocs. */
2274
2275 static bfd_boolean
2276 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2277 {
2278 struct bfd_link_info *info;
2279 struct elf_i386_link_hash_table *htab;
2280 struct elf_i386_link_hash_entry *eh;
2281 struct elf_dyn_relocs *p;
2282 unsigned plt_entry_size;
2283
2284 if (h->root.type == bfd_link_hash_indirect)
2285 return TRUE;
2286
2287 eh = (struct elf_i386_link_hash_entry *) h;
2288
2289 info = (struct bfd_link_info *) inf;
2290 htab = elf_i386_hash_table (info);
2291 if (htab == NULL)
2292 return FALSE;
2293
2294 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2295
2296 /* We can't use the GOT PLT if pointer equality is needed since
2297 finish_dynamic_symbol won't clear symbol value and the dynamic
2298 linker won't update the GOT slot. We will get into an infinite
2299 loop at run-time. */
2300 if (htab->plt_got != NULL
2301 && h->type != STT_GNU_IFUNC
2302 && !h->pointer_equality_needed
2303 && h->plt.refcount > 0
2304 && h->got.refcount > 0)
2305 {
2306 /* Don't use the regular PLT if there are both GOT and GOTPLT
2307 reloctions. */
2308 h->plt.offset = (bfd_vma) -1;
2309
2310 /* Use the GOT PLT. */
2311 eh->plt_got.refcount = 1;
2312 }
2313
2314 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2315 here if it is defined and referenced in a non-shared object. */
2316 if (h->type == STT_GNU_IFUNC
2317 && h->def_regular)
2318 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2319 plt_entry_size,
2320 plt_entry_size, 4);
2321 else if (htab->elf.dynamic_sections_created
2322 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2323 {
2324 bfd_boolean use_plt_got;
2325
2326 if ((info->flags & DF_BIND_NOW))
2327 {
2328 /* Don't use the regular PLT for DF_BIND_NOW. */
2329 h->plt.offset = (bfd_vma) -1;
2330
2331 /* Use the GOT PLT. */
2332 h->got.refcount = 1;
2333 eh->plt_got.refcount = 1;
2334 }
2335
2336 use_plt_got = eh->plt_got.refcount > 0;
2337
2338 /* Make sure this symbol is output as a dynamic symbol.
2339 Undefined weak syms won't yet be marked as dynamic. */
2340 if (h->dynindx == -1
2341 && !h->forced_local)
2342 {
2343 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2344 return FALSE;
2345 }
2346
2347 if (info->shared
2348 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2349 {
2350 asection *s = htab->elf.splt;
2351 asection *got_s = htab->plt_got;
2352
2353 if (use_plt_got)
2354 eh->plt_got.offset = got_s->size;
2355 else
2356 {
2357 /* If this is the first .plt entry, make room for the
2358 special first entry. */
2359 if (s->size == 0)
2360 s->size = plt_entry_size;
2361 h->plt.offset = s->size;
2362 }
2363
2364 /* If this symbol is not defined in a regular file, and we are
2365 not generating a shared library, then set the symbol to this
2366 location in the .plt. This is required to make function
2367 pointers compare as equal between the normal executable and
2368 the shared library. */
2369 if (! info->shared
2370 && !h->def_regular)
2371 {
2372 if (use_plt_got)
2373 {
2374 /* We need to make a call to the entry of the GOT PLT
2375 instead of regular PLT entry. */
2376 h->root.u.def.section = got_s;
2377 h->root.u.def.value = eh->plt_got.offset;
2378 }
2379 else
2380 {
2381 h->root.u.def.section = s;
2382 h->root.u.def.value = h->plt.offset;
2383 }
2384 }
2385
2386 /* Make room for this entry. */
2387 if (use_plt_got)
2388 got_s->size += sizeof (elf_i386_got_plt_entry);
2389 else
2390 {
2391 s->size += plt_entry_size;
2392
2393 /* We also need to make an entry in the .got.plt section,
2394 which will be placed in the .got section by the linker
2395 script. */
2396 htab->elf.sgotplt->size += 4;
2397
2398 /* We also need to make an entry in the .rel.plt section. */
2399 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2400 htab->elf.srelplt->reloc_count++;
2401 }
2402
2403 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2404 && !info->shared)
2405 {
2406 /* VxWorks has a second set of relocations for each PLT entry
2407 in executables. They go in a separate relocation section,
2408 which is processed by the kernel loader. */
2409
2410 /* There are two relocations for the initial PLT entry: an
2411 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2412 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2413
2414 if (h->plt.offset == plt_entry_size)
2415 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2416
2417 /* There are two extra relocations for each subsequent PLT entry:
2418 an R_386_32 relocation for the GOT entry, and an R_386_32
2419 relocation for the PLT entry. */
2420
2421 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2422 }
2423 }
2424 else
2425 {
2426 h->plt.offset = (bfd_vma) -1;
2427 h->needs_plt = 0;
2428 }
2429 }
2430 else
2431 {
2432 h->plt.offset = (bfd_vma) -1;
2433 h->needs_plt = 0;
2434 }
2435
2436 eh->tlsdesc_got = (bfd_vma) -1;
2437
2438 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2439 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2440 if (h->got.refcount > 0
2441 && info->executable
2442 && h->dynindx == -1
2443 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2444 h->got.offset = (bfd_vma) -1;
2445 else if (h->got.refcount > 0)
2446 {
2447 asection *s;
2448 bfd_boolean dyn;
2449 int tls_type = elf_i386_hash_entry(h)->tls_type;
2450
2451 /* Make sure this symbol is output as a dynamic symbol.
2452 Undefined weak syms won't yet be marked as dynamic. */
2453 if (h->dynindx == -1
2454 && !h->forced_local)
2455 {
2456 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2457 return FALSE;
2458 }
2459
2460 s = htab->elf.sgot;
2461 if (GOT_TLS_GDESC_P (tls_type))
2462 {
2463 eh->tlsdesc_got = htab->elf.sgotplt->size
2464 - elf_i386_compute_jump_table_size (htab);
2465 htab->elf.sgotplt->size += 8;
2466 h->got.offset = (bfd_vma) -2;
2467 }
2468 if (! GOT_TLS_GDESC_P (tls_type)
2469 || GOT_TLS_GD_P (tls_type))
2470 {
2471 h->got.offset = s->size;
2472 s->size += 4;
2473 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2474 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2475 s->size += 4;
2476 }
2477 dyn = htab->elf.dynamic_sections_created;
2478 /* R_386_TLS_IE_32 needs one dynamic relocation,
2479 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2480 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2481 need two), R_386_TLS_GD needs one if local symbol and two if
2482 global. */
2483 if (tls_type == GOT_TLS_IE_BOTH)
2484 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2485 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2486 || (tls_type & GOT_TLS_IE))
2487 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2488 else if (GOT_TLS_GD_P (tls_type))
2489 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2490 else if (! GOT_TLS_GDESC_P (tls_type)
2491 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2492 || h->root.type != bfd_link_hash_undefweak)
2493 && (info->shared
2494 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2495 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2496 if (GOT_TLS_GDESC_P (tls_type))
2497 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2498 }
2499 else
2500 h->got.offset = (bfd_vma) -1;
2501
2502 if (eh->dyn_relocs == NULL)
2503 return TRUE;
2504
2505 /* In the shared -Bsymbolic case, discard space allocated for
2506 dynamic pc-relative relocs against symbols which turn out to be
2507 defined in regular objects. For the normal shared case, discard
2508 space for pc-relative relocs that have become local due to symbol
2509 visibility changes. */
2510
2511 if (info->shared)
2512 {
2513 /* The only reloc that uses pc_count is R_386_PC32, which will
2514 appear on a call or on something like ".long foo - .". We
2515 want calls to protected symbols to resolve directly to the
2516 function rather than going via the plt. If people want
2517 function pointer comparisons to work as expected then they
2518 should avoid writing assembly like ".long foo - .". */
2519 if (SYMBOL_CALLS_LOCAL (info, h))
2520 {
2521 struct elf_dyn_relocs **pp;
2522
2523 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2524 {
2525 p->count -= p->pc_count;
2526 p->pc_count = 0;
2527 if (p->count == 0)
2528 *pp = p->next;
2529 else
2530 pp = &p->next;
2531 }
2532 }
2533
2534 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2535 {
2536 struct elf_dyn_relocs **pp;
2537 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2538 {
2539 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2540 *pp = p->next;
2541 else
2542 pp = &p->next;
2543 }
2544 }
2545
2546 /* Also discard relocs on undefined weak syms with non-default
2547 visibility. */
2548 if (eh->dyn_relocs != NULL
2549 && h->root.type == bfd_link_hash_undefweak)
2550 {
2551 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2552 eh->dyn_relocs = NULL;
2553
2554 /* Make sure undefined weak symbols are output as a dynamic
2555 symbol in PIEs. */
2556 else if (h->dynindx == -1
2557 && !h->forced_local)
2558 {
2559 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2560 return FALSE;
2561 }
2562 }
2563 }
2564 else if (ELIMINATE_COPY_RELOCS)
2565 {
2566 /* For the non-shared case, discard space for relocs against
2567 symbols which turn out to need copy relocs or are not
2568 dynamic. */
2569
2570 if (!h->non_got_ref
2571 && ((h->def_dynamic
2572 && !h->def_regular)
2573 || (htab->elf.dynamic_sections_created
2574 && (h->root.type == bfd_link_hash_undefweak
2575 || h->root.type == bfd_link_hash_undefined))))
2576 {
2577 /* Make sure this symbol is output as a dynamic symbol.
2578 Undefined weak syms won't yet be marked as dynamic. */
2579 if (h->dynindx == -1
2580 && !h->forced_local)
2581 {
2582 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2583 return FALSE;
2584 }
2585
2586 /* If that succeeded, we know we'll be keeping all the
2587 relocs. */
2588 if (h->dynindx != -1)
2589 goto keep;
2590 }
2591
2592 eh->dyn_relocs = NULL;
2593
2594 keep: ;
2595 }
2596
2597 /* Finally, allocate space. */
2598 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2599 {
2600 asection *sreloc;
2601
2602 sreloc = elf_section_data (p->sec)->sreloc;
2603
2604 BFD_ASSERT (sreloc != NULL);
2605 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2606 }
2607
2608 return TRUE;
2609 }
2610
2611 /* Allocate space in .plt, .got and associated reloc sections for
2612 local dynamic relocs. */
2613
2614 static bfd_boolean
2615 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2616 {
2617 struct elf_link_hash_entry *h
2618 = (struct elf_link_hash_entry *) *slot;
2619
2620 if (h->type != STT_GNU_IFUNC
2621 || !h->def_regular
2622 || !h->ref_regular
2623 || !h->forced_local
2624 || h->root.type != bfd_link_hash_defined)
2625 abort ();
2626
2627 return elf_i386_allocate_dynrelocs (h, inf);
2628 }
2629
2630 /* Find any dynamic relocs that apply to read-only sections. */
2631
2632 static bfd_boolean
2633 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2634 {
2635 struct elf_i386_link_hash_entry *eh;
2636 struct elf_dyn_relocs *p;
2637
2638 /* Skip local IFUNC symbols. */
2639 if (h->forced_local && h->type == STT_GNU_IFUNC)
2640 return TRUE;
2641
2642 eh = (struct elf_i386_link_hash_entry *) h;
2643 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2644 {
2645 asection *s = p->sec->output_section;
2646
2647 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2648 {
2649 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2650
2651 info->flags |= DF_TEXTREL;
2652
2653 if ((info->warn_shared_textrel && info->shared)
2654 || info->error_textrel)
2655 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2656 p->sec->owner, h->root.root.string,
2657 p->sec);
2658
2659 /* Not an error, just cut short the traversal. */
2660 return FALSE;
2661 }
2662 }
2663 return TRUE;
2664 }
2665
2666 /* Convert
2667 mov foo@GOT(%reg), %reg
2668 to
2669 lea foo@GOTOFF(%reg), %reg
2670 with the local symbol, foo. */
2671
2672 static bfd_boolean
2673 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2674 struct bfd_link_info *link_info)
2675 {
2676 Elf_Internal_Shdr *symtab_hdr;
2677 Elf_Internal_Rela *internal_relocs;
2678 Elf_Internal_Rela *irel, *irelend;
2679 bfd_byte *contents;
2680 struct elf_i386_link_hash_table *htab;
2681 bfd_boolean changed_contents;
2682 bfd_boolean changed_relocs;
2683 bfd_signed_vma *local_got_refcounts;
2684
2685 /* Don't even try to convert non-ELF outputs. */
2686 if (!is_elf_hash_table (link_info->hash))
2687 return FALSE;
2688
2689 /* Nothing to do if there is no need or no output. */
2690 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2691 || sec->need_convert_mov_to_lea == 0
2692 || bfd_is_abs_section (sec->output_section))
2693 return TRUE;
2694
2695 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2696
2697 /* Load the relocations for this section. */
2698 internal_relocs = (_bfd_elf_link_read_relocs
2699 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2700 link_info->keep_memory));
2701 if (internal_relocs == NULL)
2702 return FALSE;
2703
2704 htab = elf_i386_hash_table (link_info);
2705 changed_contents = FALSE;
2706 changed_relocs = FALSE;
2707 local_got_refcounts = elf_local_got_refcounts (abfd);
2708
2709 /* Get the section contents. */
2710 if (elf_section_data (sec)->this_hdr.contents != NULL)
2711 contents = elf_section_data (sec)->this_hdr.contents;
2712 else
2713 {
2714 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2715 goto error_return;
2716 }
2717
2718 irelend = internal_relocs + sec->reloc_count;
2719 for (irel = internal_relocs; irel < irelend; irel++)
2720 {
2721 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2722 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2723 unsigned int indx;
2724 struct elf_link_hash_entry *h;
2725
2726 if (r_type != R_386_GOT32)
2727 continue;
2728
2729 /* Get the symbol referred to by the reloc. */
2730 if (r_symndx < symtab_hdr->sh_info)
2731 {
2732 Elf_Internal_Sym *isym;
2733
2734 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2735 abfd, r_symndx);
2736
2737 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2738 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2739 && irel->r_offset >= 2
2740 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2741 {
2742 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2743 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2744 if (local_got_refcounts != NULL
2745 && local_got_refcounts[r_symndx] > 0)
2746 local_got_refcounts[r_symndx] -= 1;
2747 changed_contents = TRUE;
2748 changed_relocs = TRUE;
2749 }
2750 continue;
2751 }
2752
2753 indx = r_symndx - symtab_hdr->sh_info;
2754 h = elf_sym_hashes (abfd)[indx];
2755 BFD_ASSERT (h != NULL);
2756
2757 while (h->root.type == bfd_link_hash_indirect
2758 || h->root.type == bfd_link_hash_warning)
2759 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2760
2761 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2762 optimizing _DYNAMIC since ld.so may use its link-time address. */
2763 if (h->def_regular
2764 && h->type != STT_GNU_IFUNC
2765 && h != htab->elf.hdynamic
2766 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2767 && irel->r_offset >= 2
2768 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2769 {
2770 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2771 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2772 if (h->got.refcount > 0)
2773 h->got.refcount -= 1;
2774 changed_contents = TRUE;
2775 changed_relocs = TRUE;
2776 }
2777 }
2778
2779 if (contents != NULL
2780 && elf_section_data (sec)->this_hdr.contents != contents)
2781 {
2782 if (!changed_contents && !link_info->keep_memory)
2783 free (contents);
2784 else
2785 {
2786 /* Cache the section contents for elf_link_input_bfd. */
2787 elf_section_data (sec)->this_hdr.contents = contents;
2788 }
2789 }
2790
2791 if (elf_section_data (sec)->relocs != internal_relocs)
2792 {
2793 if (!changed_relocs)
2794 free (internal_relocs);
2795 else
2796 elf_section_data (sec)->relocs = internal_relocs;
2797 }
2798
2799 return TRUE;
2800
2801 error_return:
2802 if (contents != NULL
2803 && elf_section_data (sec)->this_hdr.contents != contents)
2804 free (contents);
2805 if (internal_relocs != NULL
2806 && elf_section_data (sec)->relocs != internal_relocs)
2807 free (internal_relocs);
2808 return FALSE;
2809 }
2810
2811 /* Set the sizes of the dynamic sections. */
2812
2813 static bfd_boolean
2814 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2815 {
2816 struct elf_i386_link_hash_table *htab;
2817 bfd *dynobj;
2818 asection *s;
2819 bfd_boolean relocs;
2820 bfd *ibfd;
2821
2822 htab = elf_i386_hash_table (info);
2823 if (htab == NULL)
2824 return FALSE;
2825 dynobj = htab->elf.dynobj;
2826 if (dynobj == NULL)
2827 abort ();
2828
2829 if (htab->elf.dynamic_sections_created)
2830 {
2831 /* Set the contents of the .interp section to the interpreter. */
2832 if (info->executable)
2833 {
2834 s = bfd_get_linker_section (dynobj, ".interp");
2835 if (s == NULL)
2836 abort ();
2837 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2838 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2839 }
2840 }
2841
2842 /* Set up .got offsets for local syms, and space for local dynamic
2843 relocs. */
2844 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2845 {
2846 bfd_signed_vma *local_got;
2847 bfd_signed_vma *end_local_got;
2848 char *local_tls_type;
2849 bfd_vma *local_tlsdesc_gotent;
2850 bfd_size_type locsymcount;
2851 Elf_Internal_Shdr *symtab_hdr;
2852 asection *srel;
2853
2854 if (! is_i386_elf (ibfd))
2855 continue;
2856
2857 for (s = ibfd->sections; s != NULL; s = s->next)
2858 {
2859 struct elf_dyn_relocs *p;
2860
2861 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2862 return FALSE;
2863
2864 for (p = ((struct elf_dyn_relocs *)
2865 elf_section_data (s)->local_dynrel);
2866 p != NULL;
2867 p = p->next)
2868 {
2869 if (!bfd_is_abs_section (p->sec)
2870 && bfd_is_abs_section (p->sec->output_section))
2871 {
2872 /* Input section has been discarded, either because
2873 it is a copy of a linkonce section or due to
2874 linker script /DISCARD/, so we'll be discarding
2875 the relocs too. */
2876 }
2877 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2878 && strcmp (p->sec->output_section->name,
2879 ".tls_vars") == 0)
2880 {
2881 /* Relocations in vxworks .tls_vars sections are
2882 handled specially by the loader. */
2883 }
2884 else if (p->count != 0)
2885 {
2886 srel = elf_section_data (p->sec)->sreloc;
2887 srel->size += p->count * sizeof (Elf32_External_Rel);
2888 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2889 && (info->flags & DF_TEXTREL) == 0)
2890 {
2891 info->flags |= DF_TEXTREL;
2892 if ((info->warn_shared_textrel && info->shared)
2893 || info->error_textrel)
2894 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2895 p->sec->owner, p->sec);
2896 }
2897 }
2898 }
2899 }
2900
2901 local_got = elf_local_got_refcounts (ibfd);
2902 if (!local_got)
2903 continue;
2904
2905 symtab_hdr = &elf_symtab_hdr (ibfd);
2906 locsymcount = symtab_hdr->sh_info;
2907 end_local_got = local_got + locsymcount;
2908 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2909 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2910 s = htab->elf.sgot;
2911 srel = htab->elf.srelgot;
2912 for (; local_got < end_local_got;
2913 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2914 {
2915 *local_tlsdesc_gotent = (bfd_vma) -1;
2916 if (*local_got > 0)
2917 {
2918 if (GOT_TLS_GDESC_P (*local_tls_type))
2919 {
2920 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2921 - elf_i386_compute_jump_table_size (htab);
2922 htab->elf.sgotplt->size += 8;
2923 *local_got = (bfd_vma) -2;
2924 }
2925 if (! GOT_TLS_GDESC_P (*local_tls_type)
2926 || GOT_TLS_GD_P (*local_tls_type))
2927 {
2928 *local_got = s->size;
2929 s->size += 4;
2930 if (GOT_TLS_GD_P (*local_tls_type)
2931 || *local_tls_type == GOT_TLS_IE_BOTH)
2932 s->size += 4;
2933 }
2934 if (info->shared
2935 || GOT_TLS_GD_ANY_P (*local_tls_type)
2936 || (*local_tls_type & GOT_TLS_IE))
2937 {
2938 if (*local_tls_type == GOT_TLS_IE_BOTH)
2939 srel->size += 2 * sizeof (Elf32_External_Rel);
2940 else if (GOT_TLS_GD_P (*local_tls_type)
2941 || ! GOT_TLS_GDESC_P (*local_tls_type))
2942 srel->size += sizeof (Elf32_External_Rel);
2943 if (GOT_TLS_GDESC_P (*local_tls_type))
2944 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2945 }
2946 }
2947 else
2948 *local_got = (bfd_vma) -1;
2949 }
2950 }
2951
2952 if (htab->tls_ldm_got.refcount > 0)
2953 {
2954 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2955 relocs. */
2956 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2957 htab->elf.sgot->size += 8;
2958 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2959 }
2960 else
2961 htab->tls_ldm_got.offset = -1;
2962
2963 /* Allocate global sym .plt and .got entries, and space for global
2964 sym dynamic relocs. */
2965 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2966
2967 /* Allocate .plt and .got entries, and space for local symbols. */
2968 htab_traverse (htab->loc_hash_table,
2969 elf_i386_allocate_local_dynrelocs,
2970 info);
2971
2972 /* For every jump slot reserved in the sgotplt, reloc_count is
2973 incremented. However, when we reserve space for TLS descriptors,
2974 it's not incremented, so in order to compute the space reserved
2975 for them, it suffices to multiply the reloc count by the jump
2976 slot size.
2977
2978 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2979 so that R_386_IRELATIVE entries come last. */
2980 if (htab->elf.srelplt)
2981 {
2982 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2983 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2984 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2985 }
2986 else if (htab->elf.irelplt)
2987 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2988
2989
2990 if (htab->elf.sgotplt)
2991 {
2992 /* Don't allocate .got.plt section if there are no GOT nor PLT
2993 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2994 if ((htab->elf.hgot == NULL
2995 || !htab->elf.hgot->ref_regular_nonweak)
2996 && (htab->elf.sgotplt->size
2997 == get_elf_backend_data (output_bfd)->got_header_size)
2998 && (htab->elf.splt == NULL
2999 || htab->elf.splt->size == 0)
3000 && (htab->elf.sgot == NULL
3001 || htab->elf.sgot->size == 0)
3002 && (htab->elf.iplt == NULL
3003 || htab->elf.iplt->size == 0)
3004 && (htab->elf.igotplt == NULL
3005 || htab->elf.igotplt->size == 0))
3006 htab->elf.sgotplt->size = 0;
3007 }
3008
3009
3010 if (htab->plt_eh_frame != NULL
3011 && htab->elf.splt != NULL
3012 && htab->elf.splt->size != 0
3013 && !bfd_is_abs_section (htab->elf.splt->output_section)
3014 && _bfd_elf_eh_frame_present (info))
3015 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3016
3017 /* We now have determined the sizes of the various dynamic sections.
3018 Allocate memory for them. */
3019 relocs = FALSE;
3020 for (s = dynobj->sections; s != NULL; s = s->next)
3021 {
3022 bfd_boolean strip_section = TRUE;
3023
3024 if ((s->flags & SEC_LINKER_CREATED) == 0)
3025 continue;
3026
3027 if (s == htab->elf.splt
3028 || s == htab->elf.sgot)
3029 {
3030 /* Strip this section if we don't need it; see the
3031 comment below. */
3032 /* We'd like to strip these sections if they aren't needed, but if
3033 we've exported dynamic symbols from them we must leave them.
3034 It's too late to tell BFD to get rid of the symbols. */
3035
3036 if (htab->elf.hplt != NULL)
3037 strip_section = FALSE;
3038 }
3039 else if (s == htab->elf.sgotplt
3040 || s == htab->elf.iplt
3041 || s == htab->elf.igotplt
3042 || s == htab->plt_got
3043 || s == htab->plt_eh_frame
3044 || s == htab->sdynbss)
3045 {
3046 /* Strip these too. */
3047 }
3048 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3049 {
3050 if (s->size != 0
3051 && s != htab->elf.srelplt
3052 && s != htab->srelplt2)
3053 relocs = TRUE;
3054
3055 /* We use the reloc_count field as a counter if we need
3056 to copy relocs into the output file. */
3057 s->reloc_count = 0;
3058 }
3059 else
3060 {
3061 /* It's not one of our sections, so don't allocate space. */
3062 continue;
3063 }
3064
3065 if (s->size == 0)
3066 {
3067 /* If we don't need this section, strip it from the
3068 output file. This is mostly to handle .rel.bss and
3069 .rel.plt. We must create both sections in
3070 create_dynamic_sections, because they must be created
3071 before the linker maps input sections to output
3072 sections. The linker does that before
3073 adjust_dynamic_symbol is called, and it is that
3074 function which decides whether anything needs to go
3075 into these sections. */
3076 if (strip_section)
3077 s->flags |= SEC_EXCLUDE;
3078 continue;
3079 }
3080
3081 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3082 continue;
3083
3084 /* Allocate memory for the section contents. We use bfd_zalloc
3085 here in case unused entries are not reclaimed before the
3086 section's contents are written out. This should not happen,
3087 but this way if it does, we get a R_386_NONE reloc instead
3088 of garbage. */
3089 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3090 if (s->contents == NULL)
3091 return FALSE;
3092 }
3093
3094 if (htab->plt_eh_frame != NULL
3095 && htab->plt_eh_frame->contents != NULL)
3096 {
3097 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3098 sizeof (elf_i386_eh_frame_plt));
3099 bfd_put_32 (dynobj, htab->elf.splt->size,
3100 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3101 }
3102
3103 if (htab->elf.dynamic_sections_created)
3104 {
3105 /* Add some entries to the .dynamic section. We fill in the
3106 values later, in elf_i386_finish_dynamic_sections, but we
3107 must add the entries now so that we get the correct size for
3108 the .dynamic section. The DT_DEBUG entry is filled in by the
3109 dynamic linker and used by the debugger. */
3110 #define add_dynamic_entry(TAG, VAL) \
3111 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3112
3113 if (info->executable)
3114 {
3115 if (!add_dynamic_entry (DT_DEBUG, 0))
3116 return FALSE;
3117 }
3118
3119 if (htab->elf.splt->size != 0)
3120 {
3121 if (!add_dynamic_entry (DT_PLTGOT, 0)
3122 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3123 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3124 || !add_dynamic_entry (DT_JMPREL, 0))
3125 return FALSE;
3126 }
3127
3128 if (relocs)
3129 {
3130 if (!add_dynamic_entry (DT_REL, 0)
3131 || !add_dynamic_entry (DT_RELSZ, 0)
3132 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3133 return FALSE;
3134
3135 /* If any dynamic relocs apply to a read-only section,
3136 then we need a DT_TEXTREL entry. */
3137 if ((info->flags & DF_TEXTREL) == 0)
3138 elf_link_hash_traverse (&htab->elf,
3139 elf_i386_readonly_dynrelocs, info);
3140
3141 if ((info->flags & DF_TEXTREL) != 0)
3142 {
3143 if (!add_dynamic_entry (DT_TEXTREL, 0))
3144 return FALSE;
3145 }
3146 }
3147 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3148 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3149 return FALSE;
3150 }
3151 #undef add_dynamic_entry
3152
3153 return TRUE;
3154 }
3155
3156 static bfd_boolean
3157 elf_i386_always_size_sections (bfd *output_bfd,
3158 struct bfd_link_info *info)
3159 {
3160 asection *tls_sec = elf_hash_table (info)->tls_sec;
3161
3162 if (tls_sec)
3163 {
3164 struct elf_link_hash_entry *tlsbase;
3165
3166 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3167 "_TLS_MODULE_BASE_",
3168 FALSE, FALSE, FALSE);
3169
3170 if (tlsbase && tlsbase->type == STT_TLS)
3171 {
3172 struct elf_i386_link_hash_table *htab;
3173 struct bfd_link_hash_entry *bh = NULL;
3174 const struct elf_backend_data *bed
3175 = get_elf_backend_data (output_bfd);
3176
3177 htab = elf_i386_hash_table (info);
3178 if (htab == NULL)
3179 return FALSE;
3180
3181 if (!(_bfd_generic_link_add_one_symbol
3182 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3183 tls_sec, 0, NULL, FALSE,
3184 bed->collect, &bh)))
3185 return FALSE;
3186
3187 htab->tls_module_base = bh;
3188
3189 tlsbase = (struct elf_link_hash_entry *)bh;
3190 tlsbase->def_regular = 1;
3191 tlsbase->other = STV_HIDDEN;
3192 tlsbase->root.linker_def = 1;
3193 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3194 }
3195 }
3196
3197 return TRUE;
3198 }
3199
3200 /* Set the correct type for an x86 ELF section. We do this by the
3201 section name, which is a hack, but ought to work. */
3202
3203 static bfd_boolean
3204 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3205 Elf_Internal_Shdr *hdr,
3206 asection *sec)
3207 {
3208 const char *name;
3209
3210 name = bfd_get_section_name (abfd, sec);
3211
3212 /* This is an ugly, but unfortunately necessary hack that is
3213 needed when producing EFI binaries on x86. It tells
3214 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3215 containing ELF relocation info. We need this hack in order to
3216 be able to generate ELF binaries that can be translated into
3217 EFI applications (which are essentially COFF objects). Those
3218 files contain a COFF ".reloc" section inside an ELFNN object,
3219 which would normally cause BFD to segfault because it would
3220 attempt to interpret this section as containing relocation
3221 entries for section "oc". With this hack enabled, ".reloc"
3222 will be treated as a normal data section, which will avoid the
3223 segfault. However, you won't be able to create an ELFNN binary
3224 with a section named "oc" that needs relocations, but that's
3225 the kind of ugly side-effects you get when detecting section
3226 types based on their names... In practice, this limitation is
3227 unlikely to bite. */
3228 if (strcmp (name, ".reloc") == 0)
3229 hdr->sh_type = SHT_PROGBITS;
3230
3231 return TRUE;
3232 }
3233
3234 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3235 executables. Rather than setting it to the beginning of the TLS
3236 section, we have to set it to the end. This function may be called
3237 multiple times, it is idempotent. */
3238
3239 static void
3240 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3241 {
3242 struct elf_i386_link_hash_table *htab;
3243 struct bfd_link_hash_entry *base;
3244
3245 if (!info->executable)
3246 return;
3247
3248 htab = elf_i386_hash_table (info);
3249 if (htab == NULL)
3250 return;
3251
3252 base = htab->tls_module_base;
3253 if (base == NULL)
3254 return;
3255
3256 base->u.def.value = htab->elf.tls_size;
3257 }
3258
3259 /* Return the base VMA address which should be subtracted from real addresses
3260 when resolving @dtpoff relocation.
3261 This is PT_TLS segment p_vaddr. */
3262
3263 static bfd_vma
3264 elf_i386_dtpoff_base (struct bfd_link_info *info)
3265 {
3266 /* If tls_sec is NULL, we should have signalled an error already. */
3267 if (elf_hash_table (info)->tls_sec == NULL)
3268 return 0;
3269 return elf_hash_table (info)->tls_sec->vma;
3270 }
3271
3272 /* Return the relocation value for @tpoff relocation
3273 if STT_TLS virtual address is ADDRESS. */
3274
3275 static bfd_vma
3276 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3277 {
3278 struct elf_link_hash_table *htab = elf_hash_table (info);
3279 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3280 bfd_vma static_tls_size;
3281
3282 /* If tls_sec is NULL, we should have signalled an error already. */
3283 if (htab->tls_sec == NULL)
3284 return 0;
3285
3286 /* Consider special static TLS alignment requirements. */
3287 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3288 return static_tls_size + htab->tls_sec->vma - address;
3289 }
3290
3291 /* Relocate an i386 ELF section. */
3292
3293 static bfd_boolean
3294 elf_i386_relocate_section (bfd *output_bfd,
3295 struct bfd_link_info *info,
3296 bfd *input_bfd,
3297 asection *input_section,
3298 bfd_byte *contents,
3299 Elf_Internal_Rela *relocs,
3300 Elf_Internal_Sym *local_syms,
3301 asection **local_sections)
3302 {
3303 struct elf_i386_link_hash_table *htab;
3304 Elf_Internal_Shdr *symtab_hdr;
3305 struct elf_link_hash_entry **sym_hashes;
3306 bfd_vma *local_got_offsets;
3307 bfd_vma *local_tlsdesc_gotents;
3308 Elf_Internal_Rela *rel;
3309 Elf_Internal_Rela *relend;
3310 bfd_boolean is_vxworks_tls;
3311 unsigned plt_entry_size;
3312
3313 BFD_ASSERT (is_i386_elf (input_bfd));
3314
3315 htab = elf_i386_hash_table (info);
3316 if (htab == NULL)
3317 return FALSE;
3318 symtab_hdr = &elf_symtab_hdr (input_bfd);
3319 sym_hashes = elf_sym_hashes (input_bfd);
3320 local_got_offsets = elf_local_got_offsets (input_bfd);
3321 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3322 /* We have to handle relocations in vxworks .tls_vars sections
3323 specially, because the dynamic loader is 'weird'. */
3324 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3325 && info->shared
3326 && !strcmp (input_section->output_section->name,
3327 ".tls_vars"));
3328
3329 elf_i386_set_tls_module_base (info);
3330
3331 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3332
3333 rel = relocs;
3334 relend = relocs + input_section->reloc_count;
3335 for (; rel < relend; rel++)
3336 {
3337 unsigned int r_type;
3338 reloc_howto_type *howto;
3339 unsigned long r_symndx;
3340 struct elf_link_hash_entry *h;
3341 struct elf_i386_link_hash_entry *eh;
3342 Elf_Internal_Sym *sym;
3343 asection *sec;
3344 bfd_vma off, offplt, plt_offset;
3345 bfd_vma relocation;
3346 bfd_boolean unresolved_reloc;
3347 bfd_reloc_status_type r;
3348 unsigned int indx;
3349 int tls_type;
3350 bfd_vma st_size;
3351 asection *resolved_plt;
3352
3353 r_type = ELF32_R_TYPE (rel->r_info);
3354 if (r_type == R_386_GNU_VTINHERIT
3355 || r_type == R_386_GNU_VTENTRY)
3356 continue;
3357
3358 if ((indx = r_type) >= R_386_standard
3359 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3360 >= R_386_ext - R_386_standard)
3361 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3362 >= R_386_irelative - R_386_ext))
3363 {
3364 (*_bfd_error_handler)
3365 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3366 input_bfd, input_section, r_type);
3367 bfd_set_error (bfd_error_bad_value);
3368 return FALSE;
3369 }
3370 howto = elf_howto_table + indx;
3371
3372 r_symndx = ELF32_R_SYM (rel->r_info);
3373 h = NULL;
3374 sym = NULL;
3375 sec = NULL;
3376 unresolved_reloc = FALSE;
3377 if (r_symndx < symtab_hdr->sh_info)
3378 {
3379 sym = local_syms + r_symndx;
3380 sec = local_sections[r_symndx];
3381 relocation = (sec->output_section->vma
3382 + sec->output_offset
3383 + sym->st_value);
3384 st_size = sym->st_size;
3385
3386 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3387 && ((sec->flags & SEC_MERGE) != 0
3388 || (info->relocatable
3389 && sec->output_offset != 0)))
3390 {
3391 bfd_vma addend;
3392 bfd_byte *where = contents + rel->r_offset;
3393
3394 switch (howto->size)
3395 {
3396 case 0:
3397 addend = bfd_get_8 (input_bfd, where);
3398 if (howto->pc_relative)
3399 {
3400 addend = (addend ^ 0x80) - 0x80;
3401 addend += 1;
3402 }
3403 break;
3404 case 1:
3405 addend = bfd_get_16 (input_bfd, where);
3406 if (howto->pc_relative)
3407 {
3408 addend = (addend ^ 0x8000) - 0x8000;
3409 addend += 2;
3410 }
3411 break;
3412 case 2:
3413 addend = bfd_get_32 (input_bfd, where);
3414 if (howto->pc_relative)
3415 {
3416 addend = (addend ^ 0x80000000) - 0x80000000;
3417 addend += 4;
3418 }
3419 break;
3420 default:
3421 abort ();
3422 }
3423
3424 if (info->relocatable)
3425 addend += sec->output_offset;
3426 else
3427 {
3428 asection *msec = sec;
3429 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3430 addend);
3431 addend -= relocation;
3432 addend += msec->output_section->vma + msec->output_offset;
3433 }
3434
3435 switch (howto->size)
3436 {
3437 case 0:
3438 /* FIXME: overflow checks. */
3439 if (howto->pc_relative)
3440 addend -= 1;
3441 bfd_put_8 (input_bfd, addend, where);
3442 break;
3443 case 1:
3444 if (howto->pc_relative)
3445 addend -= 2;
3446 bfd_put_16 (input_bfd, addend, where);
3447 break;
3448 case 2:
3449 if (howto->pc_relative)
3450 addend -= 4;
3451 bfd_put_32 (input_bfd, addend, where);
3452 break;
3453 }
3454 }
3455 else if (!info->relocatable
3456 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3457 {
3458 /* Relocate against local STT_GNU_IFUNC symbol. */
3459 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3460 FALSE);
3461 if (h == NULL)
3462 abort ();
3463
3464 /* Set STT_GNU_IFUNC symbol value. */
3465 h->root.u.def.value = sym->st_value;
3466 h->root.u.def.section = sec;
3467 }
3468 }
3469 else
3470 {
3471 bfd_boolean warned ATTRIBUTE_UNUSED;
3472 bfd_boolean ignored ATTRIBUTE_UNUSED;
3473
3474 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3475 r_symndx, symtab_hdr, sym_hashes,
3476 h, sec, relocation,
3477 unresolved_reloc, warned, ignored);
3478 st_size = h->size;
3479 }
3480
3481 if (sec != NULL && discarded_section (sec))
3482 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3483 rel, 1, relend, howto, 0, contents);
3484
3485 if (info->relocatable)
3486 continue;
3487
3488 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3489 it here if it is defined in a non-shared object. */
3490 if (h != NULL
3491 && h->type == STT_GNU_IFUNC
3492 && h->def_regular)
3493 {
3494 asection *plt, *gotplt, *base_got;
3495 bfd_vma plt_index;
3496 const char *name;
3497
3498 if ((input_section->flags & SEC_ALLOC) == 0
3499 || h->plt.offset == (bfd_vma) -1)
3500 abort ();
3501
3502 /* STT_GNU_IFUNC symbol must go through PLT. */
3503 if (htab->elf.splt != NULL)
3504 {
3505 plt = htab->elf.splt;
3506 gotplt = htab->elf.sgotplt;
3507 }
3508 else
3509 {
3510 plt = htab->elf.iplt;
3511 gotplt = htab->elf.igotplt;
3512 }
3513
3514 relocation = (plt->output_section->vma
3515 + plt->output_offset + h->plt.offset);
3516
3517 switch (r_type)
3518 {
3519 default:
3520 if (h->root.root.string)
3521 name = h->root.root.string;
3522 else
3523 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3524 NULL);
3525 (*_bfd_error_handler)
3526 (_("%B: relocation %s against STT_GNU_IFUNC "
3527 "symbol `%s' isn't handled by %s"), input_bfd,
3528 elf_howto_table[r_type].name,
3529 name, __FUNCTION__);
3530 bfd_set_error (bfd_error_bad_value);
3531 return FALSE;
3532
3533 case R_386_32:
3534 /* Generate dynamic relcoation only when there is a
3535 non-GOT reference in a shared object. */
3536 if (info->shared && h->non_got_ref)
3537 {
3538 Elf_Internal_Rela outrel;
3539 asection *sreloc;
3540 bfd_vma offset;
3541
3542 /* Need a dynamic relocation to get the real function
3543 adddress. */
3544 offset = _bfd_elf_section_offset (output_bfd,
3545 info,
3546 input_section,
3547 rel->r_offset);
3548 if (offset == (bfd_vma) -1
3549 || offset == (bfd_vma) -2)
3550 abort ();
3551
3552 outrel.r_offset = (input_section->output_section->vma
3553 + input_section->output_offset
3554 + offset);
3555
3556 if (h->dynindx == -1
3557 || h->forced_local
3558 || info->executable)
3559 {
3560 /* This symbol is resolved locally. */
3561 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3562 bfd_put_32 (output_bfd,
3563 (h->root.u.def.value
3564 + h->root.u.def.section->output_section->vma
3565 + h->root.u.def.section->output_offset),
3566 contents + offset);
3567 }
3568 else
3569 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3570
3571 sreloc = htab->elf.irelifunc;
3572 elf_append_rel (output_bfd, sreloc, &outrel);
3573
3574 /* If this reloc is against an external symbol, we
3575 do not want to fiddle with the addend. Otherwise,
3576 we need to include the symbol value so that it
3577 becomes an addend for the dynamic reloc. For an
3578 internal symbol, we have updated addend. */
3579 continue;
3580 }
3581 /* FALLTHROUGH */
3582 case R_386_PC32:
3583 case R_386_PLT32:
3584 goto do_relocation;
3585
3586 case R_386_GOT32:
3587 base_got = htab->elf.sgot;
3588 off = h->got.offset;
3589
3590 if (base_got == NULL)
3591 abort ();
3592
3593 if (off == (bfd_vma) -1)
3594 {
3595 /* We can't use h->got.offset here to save state, or
3596 even just remember the offset, as finish_dynamic_symbol
3597 would use that as offset into .got. */
3598
3599 if (htab->elf.splt != NULL)
3600 {
3601 plt_index = h->plt.offset / plt_entry_size - 1;
3602 off = (plt_index + 3) * 4;
3603 base_got = htab->elf.sgotplt;
3604 }
3605 else
3606 {
3607 plt_index = h->plt.offset / plt_entry_size;
3608 off = plt_index * 4;
3609 base_got = htab->elf.igotplt;
3610 }
3611
3612 if (h->dynindx == -1
3613 || h->forced_local
3614 || info->symbolic)
3615 {
3616 /* This references the local defitionion. We must
3617 initialize this entry in the global offset table.
3618 Since the offset must always be a multiple of 8,
3619 we use the least significant bit to record
3620 whether we have initialized it already.
3621
3622 When doing a dynamic link, we create a .rela.got
3623 relocation entry to initialize the value. This
3624 is done in the finish_dynamic_symbol routine. */
3625 if ((off & 1) != 0)
3626 off &= ~1;
3627 else
3628 {
3629 bfd_put_32 (output_bfd, relocation,
3630 base_got->contents + off);
3631 h->got.offset |= 1;
3632 }
3633 }
3634
3635 relocation = off;
3636
3637 /* Adjust for static executables. */
3638 if (htab->elf.splt == NULL)
3639 relocation += gotplt->output_offset;
3640 }
3641 else
3642 {
3643 relocation = (base_got->output_section->vma
3644 + base_got->output_offset + off
3645 - gotplt->output_section->vma
3646 - gotplt->output_offset);
3647 /* Adjust for static executables. */
3648 if (htab->elf.splt == NULL)
3649 relocation += gotplt->output_offset;
3650 }
3651
3652 goto do_relocation;
3653
3654 case R_386_GOTOFF:
3655 relocation -= (gotplt->output_section->vma
3656 + gotplt->output_offset);
3657 goto do_relocation;
3658 }
3659 }
3660
3661 switch (r_type)
3662 {
3663 case R_386_GOT32:
3664 /* Relocation is to the entry for this symbol in the global
3665 offset table. */
3666 if (htab->elf.sgot == NULL)
3667 abort ();
3668
3669 if (h != NULL)
3670 {
3671 bfd_boolean dyn;
3672
3673 off = h->got.offset;
3674 dyn = htab->elf.dynamic_sections_created;
3675 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3676 || (info->shared
3677 && SYMBOL_REFERENCES_LOCAL (info, h))
3678 || (ELF_ST_VISIBILITY (h->other)
3679 && h->root.type == bfd_link_hash_undefweak))
3680 {
3681 /* This is actually a static link, or it is a
3682 -Bsymbolic link and the symbol is defined
3683 locally, or the symbol was forced to be local
3684 because of a version file. We must initialize
3685 this entry in the global offset table. Since the
3686 offset must always be a multiple of 4, we use the
3687 least significant bit to record whether we have
3688 initialized it already.
3689
3690 When doing a dynamic link, we create a .rel.got
3691 relocation entry to initialize the value. This
3692 is done in the finish_dynamic_symbol routine. */
3693 if ((off & 1) != 0)
3694 off &= ~1;
3695 else
3696 {
3697 bfd_put_32 (output_bfd, relocation,
3698 htab->elf.sgot->contents + off);
3699 h->got.offset |= 1;
3700 }
3701 }
3702 else
3703 unresolved_reloc = FALSE;
3704 }
3705 else
3706 {
3707 if (local_got_offsets == NULL)
3708 abort ();
3709
3710 off = local_got_offsets[r_symndx];
3711
3712 /* The offset must always be a multiple of 4. We use
3713 the least significant bit to record whether we have
3714 already generated the necessary reloc. */
3715 if ((off & 1) != 0)
3716 off &= ~1;
3717 else
3718 {
3719 bfd_put_32 (output_bfd, relocation,
3720 htab->elf.sgot->contents + off);
3721
3722 if (info->shared)
3723 {
3724 asection *s;
3725 Elf_Internal_Rela outrel;
3726
3727 s = htab->elf.srelgot;
3728 if (s == NULL)
3729 abort ();
3730
3731 outrel.r_offset = (htab->elf.sgot->output_section->vma
3732 + htab->elf.sgot->output_offset
3733 + off);
3734 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3735 elf_append_rel (output_bfd, s, &outrel);
3736 }
3737
3738 local_got_offsets[r_symndx] |= 1;
3739 }
3740 }
3741
3742 if (off >= (bfd_vma) -2)
3743 abort ();
3744
3745 relocation = htab->elf.sgot->output_section->vma
3746 + htab->elf.sgot->output_offset + off
3747 - htab->elf.sgotplt->output_section->vma
3748 - htab->elf.sgotplt->output_offset;
3749 break;
3750
3751 case R_386_GOTOFF:
3752 /* Relocation is relative to the start of the global offset
3753 table. */
3754
3755 /* Check to make sure it isn't a protected function or data
3756 symbol for shared library since it may not be local when
3757 used as function address or with copy relocation. We also
3758 need to make sure that a symbol is referenced locally. */
3759 if (!info->executable && h)
3760 {
3761 if (!h->def_regular)
3762 {
3763 const char *v;
3764
3765 switch (ELF_ST_VISIBILITY (h->other))
3766 {
3767 case STV_HIDDEN:
3768 v = _("hidden symbol");
3769 break;
3770 case STV_INTERNAL:
3771 v = _("internal symbol");
3772 break;
3773 case STV_PROTECTED:
3774 v = _("protected symbol");
3775 break;
3776 default:
3777 v = _("symbol");
3778 break;
3779 }
3780
3781 (*_bfd_error_handler)
3782 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3783 input_bfd, v, h->root.root.string);
3784 bfd_set_error (bfd_error_bad_value);
3785 return FALSE;
3786 }
3787 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3788 && (h->type == STT_FUNC
3789 || h->type == STT_OBJECT)
3790 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3791 {
3792 (*_bfd_error_handler)
3793 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3794 input_bfd,
3795 h->type == STT_FUNC ? "function" : "data",
3796 h->root.root.string);
3797 bfd_set_error (bfd_error_bad_value);
3798 return FALSE;
3799 }
3800 }
3801
3802 /* Note that sgot is not involved in this
3803 calculation. We always want the start of .got.plt. If we
3804 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3805 permitted by the ABI, we might have to change this
3806 calculation. */
3807 relocation -= htab->elf.sgotplt->output_section->vma
3808 + htab->elf.sgotplt->output_offset;
3809 break;
3810
3811 case R_386_GOTPC:
3812 /* Use global offset table as symbol value. */
3813 relocation = htab->elf.sgotplt->output_section->vma
3814 + htab->elf.sgotplt->output_offset;
3815 unresolved_reloc = FALSE;
3816 break;
3817
3818 case R_386_PLT32:
3819 /* Relocation is to the entry for this symbol in the
3820 procedure linkage table. */
3821
3822 /* Resolve a PLT32 reloc against a local symbol directly,
3823 without using the procedure linkage table. */
3824 if (h == NULL)
3825 break;
3826
3827 eh = (struct elf_i386_link_hash_entry *) h;
3828 if ((h->plt.offset == (bfd_vma) -1
3829 && eh->plt_got.offset == (bfd_vma) -1)
3830 || htab->elf.splt == NULL)
3831 {
3832 /* We didn't make a PLT entry for this symbol. This
3833 happens when statically linking PIC code, or when
3834 using -Bsymbolic. */
3835 break;
3836 }
3837
3838 if (h->plt.offset != (bfd_vma) -1)
3839 {
3840 resolved_plt = htab->elf.splt;
3841 plt_offset = h->plt.offset;
3842 }
3843 else
3844 {
3845 resolved_plt = htab->plt_got;
3846 plt_offset = eh->plt_got.offset;
3847 }
3848
3849 relocation = (resolved_plt->output_section->vma
3850 + resolved_plt->output_offset
3851 + plt_offset);
3852 unresolved_reloc = FALSE;
3853 break;
3854
3855 case R_386_SIZE32:
3856 /* Set to symbol size. */
3857 relocation = st_size;
3858 /* Fall through. */
3859
3860 case R_386_32:
3861 case R_386_PC32:
3862 if ((input_section->flags & SEC_ALLOC) == 0
3863 || is_vxworks_tls)
3864 break;
3865
3866 if ((info->shared
3867 && (h == NULL
3868 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3869 || h->root.type != bfd_link_hash_undefweak)
3870 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3871 || !SYMBOL_CALLS_LOCAL (info, h)))
3872 || (ELIMINATE_COPY_RELOCS
3873 && !info->shared
3874 && h != NULL
3875 && h->dynindx != -1
3876 && !h->non_got_ref
3877 && ((h->def_dynamic
3878 && !h->def_regular)
3879 || h->root.type == bfd_link_hash_undefweak
3880 || h->root.type == bfd_link_hash_undefined)))
3881 {
3882 Elf_Internal_Rela outrel;
3883 bfd_boolean skip, relocate;
3884 asection *sreloc;
3885
3886 /* When generating a shared object, these relocations
3887 are copied into the output file to be resolved at run
3888 time. */
3889
3890 skip = FALSE;
3891 relocate = FALSE;
3892
3893 outrel.r_offset =
3894 _bfd_elf_section_offset (output_bfd, info, input_section,
3895 rel->r_offset);
3896 if (outrel.r_offset == (bfd_vma) -1)
3897 skip = TRUE;
3898 else if (outrel.r_offset == (bfd_vma) -2)
3899 skip = TRUE, relocate = TRUE;
3900 outrel.r_offset += (input_section->output_section->vma
3901 + input_section->output_offset);
3902
3903 if (skip)
3904 memset (&outrel, 0, sizeof outrel);
3905 else if (h != NULL
3906 && h->dynindx != -1
3907 && (r_type == R_386_PC32
3908 || !info->shared
3909 || !SYMBOLIC_BIND (info, h)
3910 || !h->def_regular))
3911 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3912 else
3913 {
3914 /* This symbol is local, or marked to become local. */
3915 relocate = TRUE;
3916 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3917 }
3918
3919 sreloc = elf_section_data (input_section)->sreloc;
3920
3921 if (sreloc == NULL || sreloc->contents == NULL)
3922 {
3923 r = bfd_reloc_notsupported;
3924 goto check_relocation_error;
3925 }
3926
3927 elf_append_rel (output_bfd, sreloc, &outrel);
3928
3929 /* If this reloc is against an external symbol, we do
3930 not want to fiddle with the addend. Otherwise, we
3931 need to include the symbol value so that it becomes
3932 an addend for the dynamic reloc. */
3933 if (! relocate)
3934 continue;
3935 }
3936 break;
3937
3938 case R_386_TLS_IE:
3939 if (!info->executable)
3940 {
3941 Elf_Internal_Rela outrel;
3942 asection *sreloc;
3943
3944 outrel.r_offset = rel->r_offset
3945 + input_section->output_section->vma
3946 + input_section->output_offset;
3947 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3948 sreloc = elf_section_data (input_section)->sreloc;
3949 if (sreloc == NULL)
3950 abort ();
3951 elf_append_rel (output_bfd, sreloc, &outrel);
3952 }
3953 /* Fall through */
3954
3955 case R_386_TLS_GD:
3956 case R_386_TLS_GOTDESC:
3957 case R_386_TLS_DESC_CALL:
3958 case R_386_TLS_IE_32:
3959 case R_386_TLS_GOTIE:
3960 tls_type = GOT_UNKNOWN;
3961 if (h == NULL && local_got_offsets)
3962 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3963 else if (h != NULL)
3964 tls_type = elf_i386_hash_entry(h)->tls_type;
3965 if (tls_type == GOT_TLS_IE)
3966 tls_type = GOT_TLS_IE_NEG;
3967
3968 if (! elf_i386_tls_transition (info, input_bfd,
3969 input_section, contents,
3970 symtab_hdr, sym_hashes,
3971 &r_type, tls_type, rel,
3972 relend, h, r_symndx))
3973 return FALSE;
3974
3975 if (r_type == R_386_TLS_LE_32)
3976 {
3977 BFD_ASSERT (! unresolved_reloc);
3978 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3979 {
3980 unsigned int type;
3981 bfd_vma roff;
3982
3983 /* GD->LE transition. */
3984 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3985 if (type == 0x04)
3986 {
3987 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3988 Change it into:
3989 movl %gs:0, %eax; subl $foo@tpoff, %eax
3990 (6 byte form of subl). */
3991 memcpy (contents + rel->r_offset - 3,
3992 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3993 roff = rel->r_offset + 5;
3994 }
3995 else
3996 {
3997 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3998 Change it into:
3999 movl %gs:0, %eax; subl $foo@tpoff, %eax
4000 (6 byte form of subl). */
4001 memcpy (contents + rel->r_offset - 2,
4002 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4003 roff = rel->r_offset + 6;
4004 }
4005 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4006 contents + roff);
4007 /* Skip R_386_PC32/R_386_PLT32. */
4008 rel++;
4009 continue;
4010 }
4011 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4012 {
4013 /* GDesc -> LE transition.
4014 It's originally something like:
4015 leal x@tlsdesc(%ebx), %eax
4016
4017 leal x@ntpoff, %eax
4018
4019 Registers other than %eax may be set up here. */
4020
4021 unsigned int val;
4022 bfd_vma roff;
4023
4024 roff = rel->r_offset;
4025 val = bfd_get_8 (input_bfd, contents + roff - 1);
4026
4027 /* Now modify the instruction as appropriate. */
4028 /* aoliva FIXME: remove the above and xor the byte
4029 below with 0x86. */
4030 bfd_put_8 (output_bfd, val ^ 0x86,
4031 contents + roff - 1);
4032 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4033 contents + roff);
4034 continue;
4035 }
4036 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4037 {
4038 /* GDesc -> LE transition.
4039 It's originally:
4040 call *(%eax)
4041 Turn it into:
4042 xchg %ax,%ax */
4043
4044 bfd_vma roff;
4045
4046 roff = rel->r_offset;
4047 bfd_put_8 (output_bfd, 0x66, contents + roff);
4048 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4049 continue;
4050 }
4051 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4052 {
4053 unsigned int val;
4054
4055 /* IE->LE transition:
4056 Originally it can be one of:
4057 movl foo, %eax
4058 movl foo, %reg
4059 addl foo, %reg
4060 We change it into:
4061 movl $foo, %eax
4062 movl $foo, %reg
4063 addl $foo, %reg. */
4064 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4065 if (val == 0xa1)
4066 {
4067 /* movl foo, %eax. */
4068 bfd_put_8 (output_bfd, 0xb8,
4069 contents + rel->r_offset - 1);
4070 }
4071 else
4072 {
4073 unsigned int type;
4074
4075 type = bfd_get_8 (input_bfd,
4076 contents + rel->r_offset - 2);
4077 switch (type)
4078 {
4079 case 0x8b:
4080 /* movl */
4081 bfd_put_8 (output_bfd, 0xc7,
4082 contents + rel->r_offset - 2);
4083 bfd_put_8 (output_bfd,
4084 0xc0 | ((val >> 3) & 7),
4085 contents + rel->r_offset - 1);
4086 break;
4087 case 0x03:
4088 /* addl */
4089 bfd_put_8 (output_bfd, 0x81,
4090 contents + rel->r_offset - 2);
4091 bfd_put_8 (output_bfd,
4092 0xc0 | ((val >> 3) & 7),
4093 contents + rel->r_offset - 1);
4094 break;
4095 default:
4096 BFD_FAIL ();
4097 break;
4098 }
4099 }
4100 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4101 contents + rel->r_offset);
4102 continue;
4103 }
4104 else
4105 {
4106 unsigned int val, type;
4107
4108 /* {IE_32,GOTIE}->LE transition:
4109 Originally it can be one of:
4110 subl foo(%reg1), %reg2
4111 movl foo(%reg1), %reg2
4112 addl foo(%reg1), %reg2
4113 We change it into:
4114 subl $foo, %reg2
4115 movl $foo, %reg2 (6 byte form)
4116 addl $foo, %reg2. */
4117 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4118 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4119 if (type == 0x8b)
4120 {
4121 /* movl */
4122 bfd_put_8 (output_bfd, 0xc7,
4123 contents + rel->r_offset - 2);
4124 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4125 contents + rel->r_offset - 1);
4126 }
4127 else if (type == 0x2b)
4128 {
4129 /* subl */
4130 bfd_put_8 (output_bfd, 0x81,
4131 contents + rel->r_offset - 2);
4132 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4133 contents + rel->r_offset - 1);
4134 }
4135 else if (type == 0x03)
4136 {
4137 /* addl */
4138 bfd_put_8 (output_bfd, 0x81,
4139 contents + rel->r_offset - 2);
4140 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4141 contents + rel->r_offset - 1);
4142 }
4143 else
4144 BFD_FAIL ();
4145 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4146 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4147 contents + rel->r_offset);
4148 else
4149 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4150 contents + rel->r_offset);
4151 continue;
4152 }
4153 }
4154
4155 if (htab->elf.sgot == NULL)
4156 abort ();
4157
4158 if (h != NULL)
4159 {
4160 off = h->got.offset;
4161 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4162 }
4163 else
4164 {
4165 if (local_got_offsets == NULL)
4166 abort ();
4167
4168 off = local_got_offsets[r_symndx];
4169 offplt = local_tlsdesc_gotents[r_symndx];
4170 }
4171
4172 if ((off & 1) != 0)
4173 off &= ~1;
4174 else
4175 {
4176 Elf_Internal_Rela outrel;
4177 int dr_type;
4178 asection *sreloc;
4179
4180 if (htab->elf.srelgot == NULL)
4181 abort ();
4182
4183 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4184
4185 if (GOT_TLS_GDESC_P (tls_type))
4186 {
4187 bfd_byte *loc;
4188 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4189 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4190 <= htab->elf.sgotplt->size);
4191 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4192 + htab->elf.sgotplt->output_offset
4193 + offplt
4194 + htab->sgotplt_jump_table_size);
4195 sreloc = htab->elf.srelplt;
4196 loc = sreloc->contents;
4197 loc += (htab->next_tls_desc_index++
4198 * sizeof (Elf32_External_Rel));
4199 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4200 <= sreloc->contents + sreloc->size);
4201 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4202 if (indx == 0)
4203 {
4204 BFD_ASSERT (! unresolved_reloc);
4205 bfd_put_32 (output_bfd,
4206 relocation - elf_i386_dtpoff_base (info),
4207 htab->elf.sgotplt->contents + offplt
4208 + htab->sgotplt_jump_table_size + 4);
4209 }
4210 else
4211 {
4212 bfd_put_32 (output_bfd, 0,
4213 htab->elf.sgotplt->contents + offplt
4214 + htab->sgotplt_jump_table_size + 4);
4215 }
4216 }
4217
4218 sreloc = htab->elf.srelgot;
4219
4220 outrel.r_offset = (htab->elf.sgot->output_section->vma
4221 + htab->elf.sgot->output_offset + off);
4222
4223 if (GOT_TLS_GD_P (tls_type))
4224 dr_type = R_386_TLS_DTPMOD32;
4225 else if (GOT_TLS_GDESC_P (tls_type))
4226 goto dr_done;
4227 else if (tls_type == GOT_TLS_IE_POS)
4228 dr_type = R_386_TLS_TPOFF;
4229 else
4230 dr_type = R_386_TLS_TPOFF32;
4231
4232 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4233 bfd_put_32 (output_bfd,
4234 relocation - elf_i386_dtpoff_base (info),
4235 htab->elf.sgot->contents + off);
4236 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4237 bfd_put_32 (output_bfd,
4238 elf_i386_dtpoff_base (info) - relocation,
4239 htab->elf.sgot->contents + off);
4240 else if (dr_type != R_386_TLS_DESC)
4241 bfd_put_32 (output_bfd, 0,
4242 htab->elf.sgot->contents + off);
4243 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4244
4245 elf_append_rel (output_bfd, sreloc, &outrel);
4246
4247 if (GOT_TLS_GD_P (tls_type))
4248 {
4249 if (indx == 0)
4250 {
4251 BFD_ASSERT (! unresolved_reloc);
4252 bfd_put_32 (output_bfd,
4253 relocation - elf_i386_dtpoff_base (info),
4254 htab->elf.sgot->contents + off + 4);
4255 }
4256 else
4257 {
4258 bfd_put_32 (output_bfd, 0,
4259 htab->elf.sgot->contents + off + 4);
4260 outrel.r_info = ELF32_R_INFO (indx,
4261 R_386_TLS_DTPOFF32);
4262 outrel.r_offset += 4;
4263 elf_append_rel (output_bfd, sreloc, &outrel);
4264 }
4265 }
4266 else if (tls_type == GOT_TLS_IE_BOTH)
4267 {
4268 bfd_put_32 (output_bfd,
4269 (indx == 0
4270 ? relocation - elf_i386_dtpoff_base (info)
4271 : 0),
4272 htab->elf.sgot->contents + off + 4);
4273 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4274 outrel.r_offset += 4;
4275 elf_append_rel (output_bfd, sreloc, &outrel);
4276 }
4277
4278 dr_done:
4279 if (h != NULL)
4280 h->got.offset |= 1;
4281 else
4282 local_got_offsets[r_symndx] |= 1;
4283 }
4284
4285 if (off >= (bfd_vma) -2
4286 && ! GOT_TLS_GDESC_P (tls_type))
4287 abort ();
4288 if (r_type == R_386_TLS_GOTDESC
4289 || r_type == R_386_TLS_DESC_CALL)
4290 {
4291 relocation = htab->sgotplt_jump_table_size + offplt;
4292 unresolved_reloc = FALSE;
4293 }
4294 else if (r_type == ELF32_R_TYPE (rel->r_info))
4295 {
4296 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4297 + htab->elf.sgotplt->output_offset;
4298 relocation = htab->elf.sgot->output_section->vma
4299 + htab->elf.sgot->output_offset + off - g_o_t;
4300 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4301 && tls_type == GOT_TLS_IE_BOTH)
4302 relocation += 4;
4303 if (r_type == R_386_TLS_IE)
4304 relocation += g_o_t;
4305 unresolved_reloc = FALSE;
4306 }
4307 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4308 {
4309 unsigned int val, type;
4310 bfd_vma roff;
4311
4312 /* GD->IE transition. */
4313 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4314 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4315 if (type == 0x04)
4316 {
4317 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4318 Change it into:
4319 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4320 val >>= 3;
4321 roff = rel->r_offset - 3;
4322 }
4323 else
4324 {
4325 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4326 Change it into:
4327 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4328 roff = rel->r_offset - 2;
4329 }
4330 memcpy (contents + roff,
4331 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4332 contents[roff + 7] = 0x80 | (val & 7);
4333 /* If foo is used only with foo@gotntpoff(%reg) and
4334 foo@indntpoff, but not with foo@gottpoff(%reg), change
4335 subl $foo@gottpoff(%reg), %eax
4336 into:
4337 addl $foo@gotntpoff(%reg), %eax. */
4338 if (tls_type == GOT_TLS_IE_POS)
4339 contents[roff + 6] = 0x03;
4340 bfd_put_32 (output_bfd,
4341 htab->elf.sgot->output_section->vma
4342 + htab->elf.sgot->output_offset + off
4343 - htab->elf.sgotplt->output_section->vma
4344 - htab->elf.sgotplt->output_offset,
4345 contents + roff + 8);
4346 /* Skip R_386_PLT32. */
4347 rel++;
4348 continue;
4349 }
4350 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4351 {
4352 /* GDesc -> IE transition.
4353 It's originally something like:
4354 leal x@tlsdesc(%ebx), %eax
4355
4356 Change it to:
4357 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4358 or:
4359 movl x@gottpoff(%ebx), %eax # before negl %eax
4360
4361 Registers other than %eax may be set up here. */
4362
4363 bfd_vma roff;
4364
4365 /* First, make sure it's a leal adding ebx to a 32-bit
4366 offset into any register, although it's probably
4367 almost always going to be eax. */
4368 roff = rel->r_offset;
4369
4370 /* Now modify the instruction as appropriate. */
4371 /* To turn a leal into a movl in the form we use it, it
4372 suffices to change the first byte from 0x8d to 0x8b.
4373 aoliva FIXME: should we decide to keep the leal, all
4374 we have to do is remove the statement below, and
4375 adjust the relaxation of R_386_TLS_DESC_CALL. */
4376 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4377
4378 if (tls_type == GOT_TLS_IE_BOTH)
4379 off += 4;
4380
4381 bfd_put_32 (output_bfd,
4382 htab->elf.sgot->output_section->vma
4383 + htab->elf.sgot->output_offset + off
4384 - htab->elf.sgotplt->output_section->vma
4385 - htab->elf.sgotplt->output_offset,
4386 contents + roff);
4387 continue;
4388 }
4389 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4390 {
4391 /* GDesc -> IE transition.
4392 It's originally:
4393 call *(%eax)
4394
4395 Change it to:
4396 xchg %ax,%ax
4397 or
4398 negl %eax
4399 depending on how we transformed the TLS_GOTDESC above.
4400 */
4401
4402 bfd_vma roff;
4403
4404 roff = rel->r_offset;
4405
4406 /* Now modify the instruction as appropriate. */
4407 if (tls_type != GOT_TLS_IE_NEG)
4408 {
4409 /* xchg %ax,%ax */
4410 bfd_put_8 (output_bfd, 0x66, contents + roff);
4411 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4412 }
4413 else
4414 {
4415 /* negl %eax */
4416 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4417 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4418 }
4419
4420 continue;
4421 }
4422 else
4423 BFD_ASSERT (FALSE);
4424 break;
4425
4426 case R_386_TLS_LDM:
4427 if (! elf_i386_tls_transition (info, input_bfd,
4428 input_section, contents,
4429 symtab_hdr, sym_hashes,
4430 &r_type, GOT_UNKNOWN, rel,
4431 relend, h, r_symndx))
4432 return FALSE;
4433
4434 if (r_type != R_386_TLS_LDM)
4435 {
4436 /* LD->LE transition:
4437 leal foo(%reg), %eax; call ___tls_get_addr.
4438 We change it into:
4439 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4440 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4441 memcpy (contents + rel->r_offset - 2,
4442 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4443 /* Skip R_386_PC32/R_386_PLT32. */
4444 rel++;
4445 continue;
4446 }
4447
4448 if (htab->elf.sgot == NULL)
4449 abort ();
4450
4451 off = htab->tls_ldm_got.offset;
4452 if (off & 1)
4453 off &= ~1;
4454 else
4455 {
4456 Elf_Internal_Rela outrel;
4457
4458 if (htab->elf.srelgot == NULL)
4459 abort ();
4460
4461 outrel.r_offset = (htab->elf.sgot->output_section->vma
4462 + htab->elf.sgot->output_offset + off);
4463
4464 bfd_put_32 (output_bfd, 0,
4465 htab->elf.sgot->contents + off);
4466 bfd_put_32 (output_bfd, 0,
4467 htab->elf.sgot->contents + off + 4);
4468 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4469 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4470 htab->tls_ldm_got.offset |= 1;
4471 }
4472 relocation = htab->elf.sgot->output_section->vma
4473 + htab->elf.sgot->output_offset + off
4474 - htab->elf.sgotplt->output_section->vma
4475 - htab->elf.sgotplt->output_offset;
4476 unresolved_reloc = FALSE;
4477 break;
4478
4479 case R_386_TLS_LDO_32:
4480 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4481 relocation -= elf_i386_dtpoff_base (info);
4482 else
4483 /* When converting LDO to LE, we must negate. */
4484 relocation = -elf_i386_tpoff (info, relocation);
4485 break;
4486
4487 case R_386_TLS_LE_32:
4488 case R_386_TLS_LE:
4489 if (!info->executable)
4490 {
4491 Elf_Internal_Rela outrel;
4492 asection *sreloc;
4493
4494 outrel.r_offset = rel->r_offset
4495 + input_section->output_section->vma
4496 + input_section->output_offset;
4497 if (h != NULL && h->dynindx != -1)
4498 indx = h->dynindx;
4499 else
4500 indx = 0;
4501 if (r_type == R_386_TLS_LE_32)
4502 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4503 else
4504 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4505 sreloc = elf_section_data (input_section)->sreloc;
4506 if (sreloc == NULL)
4507 abort ();
4508 elf_append_rel (output_bfd, sreloc, &outrel);
4509 if (indx)
4510 continue;
4511 else if (r_type == R_386_TLS_LE_32)
4512 relocation = elf_i386_dtpoff_base (info) - relocation;
4513 else
4514 relocation -= elf_i386_dtpoff_base (info);
4515 }
4516 else if (r_type == R_386_TLS_LE_32)
4517 relocation = elf_i386_tpoff (info, relocation);
4518 else
4519 relocation = -elf_i386_tpoff (info, relocation);
4520 break;
4521
4522 default:
4523 break;
4524 }
4525
4526 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4527 because such sections are not SEC_ALLOC and thus ld.so will
4528 not process them. */
4529 if (unresolved_reloc
4530 && !((input_section->flags & SEC_DEBUGGING) != 0
4531 && h->def_dynamic)
4532 && _bfd_elf_section_offset (output_bfd, info, input_section,
4533 rel->r_offset) != (bfd_vma) -1)
4534 {
4535 (*_bfd_error_handler)
4536 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4537 input_bfd,
4538 input_section,
4539 (long) rel->r_offset,
4540 howto->name,
4541 h->root.root.string);
4542 return FALSE;
4543 }
4544
4545 do_relocation:
4546 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4547 contents, rel->r_offset,
4548 relocation, 0);
4549
4550 check_relocation_error:
4551 if (r != bfd_reloc_ok)
4552 {
4553 const char *name;
4554
4555 if (h != NULL)
4556 name = h->root.root.string;
4557 else
4558 {
4559 name = bfd_elf_string_from_elf_section (input_bfd,
4560 symtab_hdr->sh_link,
4561 sym->st_name);
4562 if (name == NULL)
4563 return FALSE;
4564 if (*name == '\0')
4565 name = bfd_section_name (input_bfd, sec);
4566 }
4567
4568 if (r == bfd_reloc_overflow)
4569 {
4570 if (! ((*info->callbacks->reloc_overflow)
4571 (info, (h ? &h->root : NULL), name, howto->name,
4572 (bfd_vma) 0, input_bfd, input_section,
4573 rel->r_offset)))
4574 return FALSE;
4575 }
4576 else
4577 {
4578 (*_bfd_error_handler)
4579 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4580 input_bfd, input_section,
4581 (long) rel->r_offset, name, (int) r);
4582 return FALSE;
4583 }
4584 }
4585 }
4586
4587 return TRUE;
4588 }
4589
4590 /* Finish up dynamic symbol handling. We set the contents of various
4591 dynamic sections here. */
4592
4593 static bfd_boolean
4594 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4595 struct bfd_link_info *info,
4596 struct elf_link_hash_entry *h,
4597 Elf_Internal_Sym *sym)
4598 {
4599 struct elf_i386_link_hash_table *htab;
4600 unsigned plt_entry_size;
4601 const struct elf_i386_backend_data *abed;
4602 struct elf_i386_link_hash_entry *eh;
4603
4604 htab = elf_i386_hash_table (info);
4605 if (htab == NULL)
4606 return FALSE;
4607
4608 abed = get_elf_i386_backend_data (output_bfd);
4609 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4610
4611 eh = (struct elf_i386_link_hash_entry *) h;
4612
4613 if (h->plt.offset != (bfd_vma) -1)
4614 {
4615 bfd_vma plt_index;
4616 bfd_vma got_offset;
4617 Elf_Internal_Rela rel;
4618 bfd_byte *loc;
4619 asection *plt, *gotplt, *relplt;
4620
4621 /* When building a static executable, use .iplt, .igot.plt and
4622 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4623 if (htab->elf.splt != NULL)
4624 {
4625 plt = htab->elf.splt;
4626 gotplt = htab->elf.sgotplt;
4627 relplt = htab->elf.srelplt;
4628 }
4629 else
4630 {
4631 plt = htab->elf.iplt;
4632 gotplt = htab->elf.igotplt;
4633 relplt = htab->elf.irelplt;
4634 }
4635
4636 /* This symbol has an entry in the procedure linkage table. Set
4637 it up. */
4638
4639 if ((h->dynindx == -1
4640 && !((h->forced_local || info->executable)
4641 && h->def_regular
4642 && h->type == STT_GNU_IFUNC))
4643 || plt == NULL
4644 || gotplt == NULL
4645 || relplt == NULL)
4646 abort ();
4647
4648 /* Get the index in the procedure linkage table which
4649 corresponds to this symbol. This is the index of this symbol
4650 in all the symbols for which we are making plt entries. The
4651 first entry in the procedure linkage table is reserved.
4652
4653 Get the offset into the .got table of the entry that
4654 corresponds to this function. Each .got entry is 4 bytes.
4655 The first three are reserved.
4656
4657 For static executables, we don't reserve anything. */
4658
4659 if (plt == htab->elf.splt)
4660 {
4661 got_offset = h->plt.offset / plt_entry_size - 1;
4662 got_offset = (got_offset + 3) * 4;
4663 }
4664 else
4665 {
4666 got_offset = h->plt.offset / plt_entry_size;
4667 got_offset = got_offset * 4;
4668 }
4669
4670 /* Fill in the entry in the procedure linkage table. */
4671 if (! info->shared)
4672 {
4673 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4674 abed->plt->plt_entry_size);
4675 bfd_put_32 (output_bfd,
4676 (gotplt->output_section->vma
4677 + gotplt->output_offset
4678 + got_offset),
4679 plt->contents + h->plt.offset
4680 + abed->plt->plt_got_offset);
4681
4682 if (abed->is_vxworks)
4683 {
4684 int s, k, reloc_index;
4685
4686 /* Create the R_386_32 relocation referencing the GOT
4687 for this PLT entry. */
4688
4689 /* S: Current slot number (zero-based). */
4690 s = ((h->plt.offset - abed->plt->plt_entry_size)
4691 / abed->plt->plt_entry_size);
4692 /* K: Number of relocations for PLTResolve. */
4693 if (info->shared)
4694 k = PLTRESOLVE_RELOCS_SHLIB;
4695 else
4696 k = PLTRESOLVE_RELOCS;
4697 /* Skip the PLTresolve relocations, and the relocations for
4698 the other PLT slots. */
4699 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4700 loc = (htab->srelplt2->contents + reloc_index
4701 * sizeof (Elf32_External_Rel));
4702
4703 rel.r_offset = (htab->elf.splt->output_section->vma
4704 + htab->elf.splt->output_offset
4705 + h->plt.offset + 2),
4706 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4707 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4708
4709 /* Create the R_386_32 relocation referencing the beginning of
4710 the PLT for this GOT entry. */
4711 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4712 + htab->elf.sgotplt->output_offset
4713 + got_offset);
4714 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4715 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4716 loc + sizeof (Elf32_External_Rel));
4717 }
4718 }
4719 else
4720 {
4721 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4722 abed->plt->plt_entry_size);
4723 bfd_put_32 (output_bfd, got_offset,
4724 plt->contents + h->plt.offset
4725 + abed->plt->plt_got_offset);
4726 }
4727
4728 /* Fill in the entry in the global offset table. */
4729 bfd_put_32 (output_bfd,
4730 (plt->output_section->vma
4731 + plt->output_offset
4732 + h->plt.offset
4733 + abed->plt->plt_lazy_offset),
4734 gotplt->contents + got_offset);
4735
4736 /* Fill in the entry in the .rel.plt section. */
4737 rel.r_offset = (gotplt->output_section->vma
4738 + gotplt->output_offset
4739 + got_offset);
4740 if (h->dynindx == -1
4741 || ((info->executable
4742 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4743 && h->def_regular
4744 && h->type == STT_GNU_IFUNC))
4745 {
4746 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4747 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4748 in the .got.plt section. */
4749 bfd_put_32 (output_bfd,
4750 (h->root.u.def.value
4751 + h->root.u.def.section->output_section->vma
4752 + h->root.u.def.section->output_offset),
4753 gotplt->contents + got_offset);
4754 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4755 /* R_386_IRELATIVE comes last. */
4756 plt_index = htab->next_irelative_index--;
4757 }
4758 else
4759 {
4760 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4761 plt_index = htab->next_jump_slot_index++;
4762 }
4763 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4764 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4765
4766 /* Don't fill PLT entry for static executables. */
4767 if (plt == htab->elf.splt)
4768 {
4769 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4770 plt->contents + h->plt.offset
4771 + abed->plt->plt_reloc_offset);
4772 bfd_put_32 (output_bfd, - (h->plt.offset
4773 + abed->plt->plt_plt_offset + 4),
4774 plt->contents + h->plt.offset
4775 + abed->plt->plt_plt_offset);
4776 }
4777 }
4778 else if (eh->plt_got.offset != (bfd_vma) -1)
4779 {
4780 bfd_vma got_offset, plt_offset;
4781 asection *plt, *got, *gotplt;
4782 const bfd_byte *got_plt_entry;
4783
4784 /* Offset of displacement of the indirect jump. */
4785 bfd_vma plt_got_offset = 2;
4786
4787 /* Set the entry in the GOT procedure linkage table. */
4788 plt = htab->plt_got;
4789 got = htab->elf.sgot;
4790 gotplt = htab->elf.sgotplt;
4791 got_offset = h->got.offset;
4792
4793 if (got_offset == (bfd_vma) -1
4794 || plt == NULL
4795 || got == NULL
4796 || gotplt == NULL)
4797 abort ();
4798
4799 /* Fill in the entry in the GOT procedure linkage table. */
4800 if (! info->shared)
4801 {
4802 got_plt_entry = elf_i386_got_plt_entry;
4803 got_offset += got->output_section->vma + got->output_offset;
4804 }
4805 else
4806 {
4807 got_plt_entry = elf_i386_pic_got_plt_entry;
4808 got_offset += (got->output_section->vma
4809 + got->output_offset
4810 - gotplt->output_section->vma
4811 - gotplt->output_offset);
4812 }
4813
4814 plt_offset = eh->plt_got.offset;
4815 memcpy (plt->contents + plt_offset, got_plt_entry,
4816 sizeof (elf_i386_got_plt_entry));
4817 bfd_put_32 (output_bfd, got_offset,
4818 plt->contents + plt_offset + plt_got_offset);
4819 }
4820
4821 if (!h->def_regular
4822 && (h->plt.offset != (bfd_vma) -1
4823 || eh->plt_got.offset != (bfd_vma) -1))
4824 {
4825 /* Mark the symbol as undefined, rather than as defined in
4826 the .plt section. Leave the value if there were any
4827 relocations where pointer equality matters (this is a clue
4828 for the dynamic linker, to make function pointer
4829 comparisons work between an application and shared
4830 library), otherwise set it to zero. If a function is only
4831 called from a binary, there is no need to slow down
4832 shared libraries because of that. */
4833 sym->st_shndx = SHN_UNDEF;
4834 if (!h->pointer_equality_needed)
4835 sym->st_value = 0;
4836 }
4837
4838 if (h->got.offset != (bfd_vma) -1
4839 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4840 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4841 {
4842 Elf_Internal_Rela rel;
4843
4844 /* This symbol has an entry in the global offset table. Set it
4845 up. */
4846
4847 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4848 abort ();
4849
4850 rel.r_offset = (htab->elf.sgot->output_section->vma
4851 + htab->elf.sgot->output_offset
4852 + (h->got.offset & ~(bfd_vma) 1));
4853
4854 /* If this is a static link, or it is a -Bsymbolic link and the
4855 symbol is defined locally or was forced to be local because
4856 of a version file, we just want to emit a RELATIVE reloc.
4857 The entry in the global offset table will already have been
4858 initialized in the relocate_section function. */
4859 if (h->def_regular
4860 && h->type == STT_GNU_IFUNC)
4861 {
4862 if (info->shared)
4863 {
4864 /* Generate R_386_GLOB_DAT. */
4865 goto do_glob_dat;
4866 }
4867 else
4868 {
4869 asection *plt;
4870
4871 if (!h->pointer_equality_needed)
4872 abort ();
4873
4874 /* For non-shared object, we can't use .got.plt, which
4875 contains the real function addres if we need pointer
4876 equality. We load the GOT entry with the PLT entry. */
4877 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4878 bfd_put_32 (output_bfd,
4879 (plt->output_section->vma
4880 + plt->output_offset + h->plt.offset),
4881 htab->elf.sgot->contents + h->got.offset);
4882 return TRUE;
4883 }
4884 }
4885 else if (info->shared
4886 && SYMBOL_REFERENCES_LOCAL (info, h))
4887 {
4888 BFD_ASSERT((h->got.offset & 1) != 0);
4889 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4890 }
4891 else
4892 {
4893 BFD_ASSERT((h->got.offset & 1) == 0);
4894 do_glob_dat:
4895 bfd_put_32 (output_bfd, (bfd_vma) 0,
4896 htab->elf.sgot->contents + h->got.offset);
4897 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4898 }
4899
4900 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4901 }
4902
4903 if (h->needs_copy)
4904 {
4905 Elf_Internal_Rela rel;
4906
4907 /* This symbol needs a copy reloc. Set it up. */
4908
4909 if (h->dynindx == -1
4910 || (h->root.type != bfd_link_hash_defined
4911 && h->root.type != bfd_link_hash_defweak)
4912 || htab->srelbss == NULL)
4913 abort ();
4914
4915 rel.r_offset = (h->root.u.def.value
4916 + h->root.u.def.section->output_section->vma
4917 + h->root.u.def.section->output_offset);
4918 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4919 elf_append_rel (output_bfd, htab->srelbss, &rel);
4920 }
4921
4922 return TRUE;
4923 }
4924
4925 /* Finish up local dynamic symbol handling. We set the contents of
4926 various dynamic sections here. */
4927
4928 static bfd_boolean
4929 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4930 {
4931 struct elf_link_hash_entry *h
4932 = (struct elf_link_hash_entry *) *slot;
4933 struct bfd_link_info *info
4934 = (struct bfd_link_info *) inf;
4935
4936 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4937 h, NULL);
4938 }
4939
4940 /* Used to decide how to sort relocs in an optimal manner for the
4941 dynamic linker, before writing them out. */
4942
4943 static enum elf_reloc_type_class
4944 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4945 const asection *rel_sec ATTRIBUTE_UNUSED,
4946 const Elf_Internal_Rela *rela)
4947 {
4948 switch (ELF32_R_TYPE (rela->r_info))
4949 {
4950 case R_386_RELATIVE:
4951 return reloc_class_relative;
4952 case R_386_JUMP_SLOT:
4953 return reloc_class_plt;
4954 case R_386_COPY:
4955 return reloc_class_copy;
4956 default:
4957 return reloc_class_normal;
4958 }
4959 }
4960
4961 /* Finish up the dynamic sections. */
4962
4963 static bfd_boolean
4964 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4965 struct bfd_link_info *info)
4966 {
4967 struct elf_i386_link_hash_table *htab;
4968 bfd *dynobj;
4969 asection *sdyn;
4970 const struct elf_i386_backend_data *abed;
4971
4972 htab = elf_i386_hash_table (info);
4973 if (htab == NULL)
4974 return FALSE;
4975
4976 dynobj = htab->elf.dynobj;
4977 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4978 abed = get_elf_i386_backend_data (output_bfd);
4979
4980 if (htab->elf.dynamic_sections_created)
4981 {
4982 Elf32_External_Dyn *dyncon, *dynconend;
4983
4984 if (sdyn == NULL || htab->elf.sgot == NULL)
4985 abort ();
4986
4987 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4988 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4989 for (; dyncon < dynconend; dyncon++)
4990 {
4991 Elf_Internal_Dyn dyn;
4992 asection *s;
4993
4994 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4995
4996 switch (dyn.d_tag)
4997 {
4998 default:
4999 if (abed->is_vxworks
5000 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5001 break;
5002 continue;
5003
5004 case DT_PLTGOT:
5005 s = htab->elf.sgotplt;
5006 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5007 break;
5008
5009 case DT_JMPREL:
5010 s = htab->elf.srelplt;
5011 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5012 break;
5013
5014 case DT_PLTRELSZ:
5015 s = htab->elf.srelplt;
5016 dyn.d_un.d_val = s->size;
5017 break;
5018
5019 case DT_RELSZ:
5020 /* My reading of the SVR4 ABI indicates that the
5021 procedure linkage table relocs (DT_JMPREL) should be
5022 included in the overall relocs (DT_REL). This is
5023 what Solaris does. However, UnixWare can not handle
5024 that case. Therefore, we override the DT_RELSZ entry
5025 here to make it not include the JMPREL relocs. */
5026 s = htab->elf.srelplt;
5027 if (s == NULL)
5028 continue;
5029 dyn.d_un.d_val -= s->size;
5030 break;
5031
5032 case DT_REL:
5033 /* We may not be using the standard ELF linker script.
5034 If .rel.plt is the first .rel section, we adjust
5035 DT_REL to not include it. */
5036 s = htab->elf.srelplt;
5037 if (s == NULL)
5038 continue;
5039 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5040 continue;
5041 dyn.d_un.d_ptr += s->size;
5042 break;
5043 }
5044
5045 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5046 }
5047
5048 /* Fill in the first entry in the procedure linkage table. */
5049 if (htab->elf.splt && htab->elf.splt->size > 0)
5050 {
5051 if (info->shared)
5052 {
5053 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5054 abed->plt->plt0_entry_size);
5055 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5056 abed->plt0_pad_byte,
5057 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5058 }
5059 else
5060 {
5061 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5062 abed->plt->plt0_entry_size);
5063 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5064 abed->plt0_pad_byte,
5065 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5066 bfd_put_32 (output_bfd,
5067 (htab->elf.sgotplt->output_section->vma
5068 + htab->elf.sgotplt->output_offset
5069 + 4),
5070 htab->elf.splt->contents
5071 + abed->plt->plt0_got1_offset);
5072 bfd_put_32 (output_bfd,
5073 (htab->elf.sgotplt->output_section->vma
5074 + htab->elf.sgotplt->output_offset
5075 + 8),
5076 htab->elf.splt->contents
5077 + abed->plt->plt0_got2_offset);
5078
5079 if (abed->is_vxworks)
5080 {
5081 Elf_Internal_Rela rel;
5082
5083 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5084 On IA32 we use REL relocations so the addend goes in
5085 the PLT directly. */
5086 rel.r_offset = (htab->elf.splt->output_section->vma
5087 + htab->elf.splt->output_offset
5088 + abed->plt->plt0_got1_offset);
5089 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5090 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5091 htab->srelplt2->contents);
5092 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5093 rel.r_offset = (htab->elf.splt->output_section->vma
5094 + htab->elf.splt->output_offset
5095 + abed->plt->plt0_got2_offset);
5096 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5097 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5098 htab->srelplt2->contents +
5099 sizeof (Elf32_External_Rel));
5100 }
5101 }
5102
5103 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5104 really seem like the right value. */
5105 elf_section_data (htab->elf.splt->output_section)
5106 ->this_hdr.sh_entsize = 4;
5107
5108 /* Correct the .rel.plt.unloaded relocations. */
5109 if (abed->is_vxworks && !info->shared)
5110 {
5111 int num_plts = (htab->elf.splt->size
5112 / abed->plt->plt_entry_size) - 1;
5113 unsigned char *p;
5114
5115 p = htab->srelplt2->contents;
5116 if (info->shared)
5117 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5118 else
5119 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5120
5121 for (; num_plts; num_plts--)
5122 {
5123 Elf_Internal_Rela rel;
5124 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5125 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5126 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5127 p += sizeof (Elf32_External_Rel);
5128
5129 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5130 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5131 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5132 p += sizeof (Elf32_External_Rel);
5133 }
5134 }
5135 }
5136 }
5137
5138 if (htab->elf.sgotplt)
5139 {
5140 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5141 {
5142 (*_bfd_error_handler)
5143 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5144 return FALSE;
5145 }
5146
5147 /* Fill in the first three entries in the global offset table. */
5148 if (htab->elf.sgotplt->size > 0)
5149 {
5150 bfd_put_32 (output_bfd,
5151 (sdyn == NULL ? 0
5152 : sdyn->output_section->vma + sdyn->output_offset),
5153 htab->elf.sgotplt->contents);
5154 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5155 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5156 }
5157
5158 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5159 }
5160
5161 /* Adjust .eh_frame for .plt section. */
5162 if (htab->plt_eh_frame != NULL
5163 && htab->plt_eh_frame->contents != NULL)
5164 {
5165 if (htab->elf.splt != NULL
5166 && htab->elf.splt->size != 0
5167 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5168 && htab->elf.splt->output_section != NULL
5169 && htab->plt_eh_frame->output_section != NULL)
5170 {
5171 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5172 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5173 + htab->plt_eh_frame->output_offset
5174 + PLT_FDE_START_OFFSET;
5175 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5176 htab->plt_eh_frame->contents
5177 + PLT_FDE_START_OFFSET);
5178 }
5179 if (htab->plt_eh_frame->sec_info_type
5180 == SEC_INFO_TYPE_EH_FRAME)
5181 {
5182 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5183 htab->plt_eh_frame,
5184 htab->plt_eh_frame->contents))
5185 return FALSE;
5186 }
5187 }
5188
5189 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5190 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5191
5192 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5193 htab_traverse (htab->loc_hash_table,
5194 elf_i386_finish_local_dynamic_symbol,
5195 info);
5196
5197 return TRUE;
5198 }
5199
5200 /* Return an array of PLT entry symbol values. */
5201
5202 static bfd_vma *
5203 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5204 asection *relplt)
5205 {
5206 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5207 arelent *p;
5208 long count, i;
5209 bfd_vma *plt_sym_val;
5210 bfd_vma plt_offset;
5211 bfd_byte *plt_contents;
5212 const struct elf_i386_backend_data *bed
5213 = get_elf_i386_backend_data (abfd);
5214 Elf_Internal_Shdr *hdr;
5215
5216 /* Get the .plt section contents. */
5217 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5218 if (plt_contents == NULL)
5219 return NULL;
5220 if (!bfd_get_section_contents (abfd, (asection *) plt,
5221 plt_contents, 0, plt->size))
5222 {
5223 bad_return:
5224 free (plt_contents);
5225 return NULL;
5226 }
5227
5228 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5229 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5230 goto bad_return;
5231
5232 hdr = &elf_section_data (relplt)->this_hdr;
5233 count = relplt->size / hdr->sh_entsize;
5234
5235 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5236 if (plt_sym_val == NULL)
5237 goto bad_return;
5238
5239 for (i = 0; i < count; i++)
5240 plt_sym_val[i] = -1;
5241
5242 plt_offset = bed->plt->plt_entry_size;
5243 p = relplt->relocation;
5244 for (i = 0; i < count; i++, p++)
5245 {
5246 long reloc_index;
5247
5248 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5249 if (p->howto == NULL)
5250 continue;
5251
5252 if (p->howto->type != R_386_JUMP_SLOT
5253 && p->howto->type != R_386_IRELATIVE)
5254 continue;
5255
5256 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5257 + bed->plt->plt_reloc_offset));
5258 reloc_index /= sizeof (Elf32_External_Rel);
5259 if (reloc_index >= count)
5260 abort ();
5261 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5262 plt_offset += bed->plt->plt_entry_size;
5263 }
5264
5265 free (plt_contents);
5266
5267 return plt_sym_val;
5268 }
5269
5270 /* Similar to _bfd_elf_get_synthetic_symtab. */
5271
5272 static long
5273 elf_i386_get_synthetic_symtab (bfd *abfd,
5274 long symcount,
5275 asymbol **syms,
5276 long dynsymcount,
5277 asymbol **dynsyms,
5278 asymbol **ret)
5279 {
5280 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5281 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5282 dynsymcount, dynsyms, ret,
5283 plt,
5284 elf_i386_get_plt_sym_val);
5285 }
5286
5287 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5288
5289 static bfd_boolean
5290 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5291 {
5292 if (h->plt.offset != (bfd_vma) -1
5293 && !h->def_regular
5294 && !h->pointer_equality_needed)
5295 return FALSE;
5296
5297 return _bfd_elf_hash_symbol (h);
5298 }
5299
5300 /* Hook called by the linker routine which adds symbols from an object
5301 file. */
5302
5303 static bfd_boolean
5304 elf_i386_add_symbol_hook (bfd * abfd,
5305 struct bfd_link_info * info,
5306 Elf_Internal_Sym * sym,
5307 const char ** namep ATTRIBUTE_UNUSED,
5308 flagword * flagsp ATTRIBUTE_UNUSED,
5309 asection ** secp ATTRIBUTE_UNUSED,
5310 bfd_vma * valp ATTRIBUTE_UNUSED)
5311 {
5312 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5313 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5314 && (abfd->flags & DYNAMIC) == 0
5315 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5316 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5317
5318 return TRUE;
5319 }
5320
5321 #define TARGET_LITTLE_SYM i386_elf32_vec
5322 #define TARGET_LITTLE_NAME "elf32-i386"
5323 #define ELF_ARCH bfd_arch_i386
5324 #define ELF_TARGET_ID I386_ELF_DATA
5325 #define ELF_MACHINE_CODE EM_386
5326 #define ELF_MAXPAGESIZE 0x1000
5327
5328 #define elf_backend_can_gc_sections 1
5329 #define elf_backend_can_refcount 1
5330 #define elf_backend_want_got_plt 1
5331 #define elf_backend_plt_readonly 1
5332 #define elf_backend_want_plt_sym 0
5333 #define elf_backend_got_header_size 12
5334 #define elf_backend_plt_alignment 4
5335 #define elf_backend_extern_protected_data 1
5336
5337 /* Support RELA for objdump of prelink objects. */
5338 #define elf_info_to_howto elf_i386_info_to_howto_rel
5339 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5340
5341 #define bfd_elf32_mkobject elf_i386_mkobject
5342
5343 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5344 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5345 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5346 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5347 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5348
5349 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5350 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5351 #define elf_backend_check_relocs elf_i386_check_relocs
5352 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5353 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5354 #define elf_backend_fake_sections elf_i386_fake_sections
5355 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5356 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5357 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5358 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5359 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5360 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5361 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5362 #define elf_backend_relocate_section elf_i386_relocate_section
5363 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5364 #define elf_backend_always_size_sections elf_i386_always_size_sections
5365 #define elf_backend_omit_section_dynsym \
5366 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5367 #define elf_backend_hash_symbol elf_i386_hash_symbol
5368 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5369
5370 #include "elf32-target.h"
5371
5372 /* FreeBSD support. */
5373
5374 #undef TARGET_LITTLE_SYM
5375 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5376 #undef TARGET_LITTLE_NAME
5377 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5378 #undef ELF_OSABI
5379 #define ELF_OSABI ELFOSABI_FREEBSD
5380
5381 /* The kernel recognizes executables as valid only if they carry a
5382 "FreeBSD" label in the ELF header. So we put this label on all
5383 executables and (for simplicity) also all other object files. */
5384
5385 static void
5386 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5387 {
5388 _bfd_elf_post_process_headers (abfd, info);
5389
5390 #ifdef OLD_FREEBSD_ABI_LABEL
5391 {
5392 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5393 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5394 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5395 }
5396 #endif
5397 }
5398
5399 #undef elf_backend_post_process_headers
5400 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5401 #undef elf32_bed
5402 #define elf32_bed elf32_i386_fbsd_bed
5403
5404 #undef elf_backend_add_symbol_hook
5405
5406 #include "elf32-target.h"
5407
5408 /* Solaris 2. */
5409
5410 #undef TARGET_LITTLE_SYM
5411 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5412 #undef TARGET_LITTLE_NAME
5413 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5414
5415 #undef elf_backend_post_process_headers
5416
5417 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5418 objects won't be recognized. */
5419 #undef ELF_OSABI
5420
5421 #undef elf32_bed
5422 #define elf32_bed elf32_i386_sol2_bed
5423
5424 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5425 boundary. */
5426 #undef elf_backend_static_tls_alignment
5427 #define elf_backend_static_tls_alignment 8
5428
5429 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5430
5431 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5432 File, p.63. */
5433 #undef elf_backend_want_plt_sym
5434 #define elf_backend_want_plt_sym 1
5435
5436 #include "elf32-target.h"
5437
5438 /* Intel MCU support. */
5439
5440 static bfd_boolean
5441 elf32_iamcu_elf_object_p (bfd *abfd)
5442 {
5443 /* Set the right machine number for an IAMCU elf32 file. */
5444 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5445 return TRUE;
5446 }
5447
5448 #undef TARGET_LITTLE_SYM
5449 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5450 #undef TARGET_LITTLE_NAME
5451 #define TARGET_LITTLE_NAME "elf32-iamcu"
5452 #undef ELF_ARCH
5453 #define ELF_ARCH bfd_arch_iamcu
5454
5455 #undef ELF_MACHINE_CODE
5456 #define ELF_MACHINE_CODE EM_IAMCU
5457
5458 #undef ELF_OSABI
5459
5460 #undef elf32_bed
5461 #define elf32_bed elf32_iamcu_bed
5462
5463 #undef elf_backend_object_p
5464 #define elf_backend_object_p elf32_iamcu_elf_object_p
5465
5466 #undef elf_backend_static_tls_alignment
5467
5468 #undef elf_backend_want_plt_sym
5469 #define elf_backend_want_plt_sym 0
5470
5471 #include "elf32-target.h"
5472
5473 /* Restore defaults. */
5474 #undef ELF_ARCH
5475 #define ELF_ARCH bfd_arch_i386
5476 #undef ELF_MACHINE_CODE
5477 #define ELF_MACHINE_CODE EM_386
5478
5479 /* Native Client support. */
5480
5481 #undef TARGET_LITTLE_SYM
5482 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5483 #undef TARGET_LITTLE_NAME
5484 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5485 #undef elf32_bed
5486 #define elf32_bed elf32_i386_nacl_bed
5487
5488 #undef ELF_MAXPAGESIZE
5489 #define ELF_MAXPAGESIZE 0x10000
5490
5491 /* Restore defaults. */
5492 #undef ELF_OSABI
5493 #undef elf_backend_want_plt_sym
5494 #define elf_backend_want_plt_sym 0
5495 #undef elf_backend_post_process_headers
5496 #undef elf_backend_static_tls_alignment
5497
5498 /* NaCl uses substantially different PLT entries for the same effects. */
5499
5500 #undef elf_backend_plt_alignment
5501 #define elf_backend_plt_alignment 5
5502 #define NACL_PLT_ENTRY_SIZE 64
5503 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5504
5505 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5506 {
5507 0xff, 0x35, /* pushl contents of address */
5508 0, 0, 0, 0, /* replaced with address of .got + 4. */
5509 0x8b, 0x0d, /* movl contents of address, %ecx */
5510 0, 0, 0, 0, /* replaced with address of .got + 8. */
5511 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5512 0xff, 0xe1 /* jmp *%ecx */
5513 };
5514
5515 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5516 {
5517 0x8b, 0x0d, /* movl contents of address, %ecx */
5518 0, 0, 0, 0, /* replaced with GOT slot address. */
5519 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5520 0xff, 0xe1, /* jmp *%ecx */
5521
5522 /* Pad to the next 32-byte boundary with nop instructions. */
5523 0x90,
5524 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5525 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5526
5527 /* Lazy GOT entries point here (32-byte aligned). */
5528 0x68, /* pushl immediate */
5529 0, 0, 0, 0, /* replaced with reloc offset. */
5530 0xe9, /* jmp relative */
5531 0, 0, 0, 0, /* replaced with offset to .plt. */
5532
5533 /* Pad to the next 32-byte boundary with nop instructions. */
5534 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5535 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5536 0x90, 0x90
5537 };
5538
5539 static const bfd_byte
5540 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5541 {
5542 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5543 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5544 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5545 0xff, 0xe1, /* jmp *%ecx */
5546
5547 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5548 so pad to that size with nop instructions. */
5549 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5550 };
5551
5552 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5553 {
5554 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5555 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5556 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5557 0xff, 0xe1, /* jmp *%ecx */
5558
5559 /* Pad to the next 32-byte boundary with nop instructions. */
5560 0x90,
5561 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5562 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5563
5564 /* Lazy GOT entries point here (32-byte aligned). */
5565 0x68, /* pushl immediate */
5566 0, 0, 0, 0, /* replaced with offset into relocation table. */
5567 0xe9, /* jmp relative */
5568 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5569
5570 /* Pad to the next 32-byte boundary with nop instructions. */
5571 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5572 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5573 0x90, 0x90
5574 };
5575
5576 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5577 {
5578 #if (PLT_CIE_LENGTH != 20 \
5579 || PLT_FDE_LENGTH != 36 \
5580 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5581 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5582 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5583 #endif
5584 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5585 0, 0, 0, 0, /* CIE ID */
5586 1, /* CIE version */
5587 'z', 'R', 0, /* Augmentation string */
5588 1, /* Code alignment factor */
5589 0x7c, /* Data alignment factor: -4 */
5590 8, /* Return address column */
5591 1, /* Augmentation size */
5592 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5593 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5594 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5595 DW_CFA_nop, DW_CFA_nop,
5596
5597 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5598 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5599 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5600 0, 0, 0, 0, /* .plt size goes here */
5601 0, /* Augmentation size */
5602 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5603 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5604 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5605 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5606 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5607 13, /* Block length */
5608 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5609 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5610 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5611 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5612 DW_CFA_nop, DW_CFA_nop
5613 };
5614
5615 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5616 {
5617 elf_i386_nacl_plt0_entry, /* plt0_entry */
5618 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5619 2, /* plt0_got1_offset */
5620 8, /* plt0_got2_offset */
5621 elf_i386_nacl_plt_entry, /* plt_entry */
5622 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5623 2, /* plt_got_offset */
5624 33, /* plt_reloc_offset */
5625 38, /* plt_plt_offset */
5626 32, /* plt_lazy_offset */
5627 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5628 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5629 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5630 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5631 };
5632
5633 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5634 {
5635 &elf_i386_nacl_plt, /* plt */
5636 0x90, /* plt0_pad_byte: nop insn */
5637 0, /* is_vxworks */
5638 };
5639
5640 static bfd_boolean
5641 elf32_i386_nacl_elf_object_p (bfd *abfd)
5642 {
5643 /* Set the right machine number for a NaCl i386 ELF32 file. */
5644 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5645 return TRUE;
5646 }
5647
5648 #undef elf_backend_arch_data
5649 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5650
5651 #undef elf_backend_object_p
5652 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5653 #undef elf_backend_modify_segment_map
5654 #define elf_backend_modify_segment_map nacl_modify_segment_map
5655 #undef elf_backend_modify_program_headers
5656 #define elf_backend_modify_program_headers nacl_modify_program_headers
5657 #undef elf_backend_final_write_processing
5658 #define elf_backend_final_write_processing nacl_final_write_processing
5659
5660 #include "elf32-target.h"
5661
5662 /* Restore defaults. */
5663 #undef elf_backend_object_p
5664 #undef elf_backend_modify_segment_map
5665 #undef elf_backend_modify_program_headers
5666 #undef elf_backend_final_write_processing
5667
5668 /* VxWorks support. */
5669
5670 #undef TARGET_LITTLE_SYM
5671 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5672 #undef TARGET_LITTLE_NAME
5673 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5674 #undef ELF_OSABI
5675 #undef elf_backend_plt_alignment
5676 #define elf_backend_plt_alignment 4
5677
5678 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5679 {
5680 &elf_i386_plt, /* plt */
5681 0x90, /* plt0_pad_byte */
5682 1, /* is_vxworks */
5683 };
5684
5685 #undef elf_backend_arch_data
5686 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5687
5688 #undef elf_backend_relocs_compatible
5689 #undef elf_backend_add_symbol_hook
5690 #define elf_backend_add_symbol_hook \
5691 elf_vxworks_add_symbol_hook
5692 #undef elf_backend_link_output_symbol_hook
5693 #define elf_backend_link_output_symbol_hook \
5694 elf_vxworks_link_output_symbol_hook
5695 #undef elf_backend_emit_relocs
5696 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5697 #undef elf_backend_final_write_processing
5698 #define elf_backend_final_write_processing \
5699 elf_vxworks_final_write_processing
5700 #undef elf_backend_static_tls_alignment
5701
5702 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5703 define it. */
5704 #undef elf_backend_want_plt_sym
5705 #define elf_backend_want_plt_sym 1
5706
5707 #undef elf32_bed
5708 #define elf32_bed elf32_i386_vxworks_bed
5709
5710 #include "elf32-target.h"
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