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Undef elf_backend_post_process_headers for Solaris
[thirdparty/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 && 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 = eh->plt_got.refcount > 0;
2325
2326 /* Make sure this symbol is output as a dynamic symbol.
2327 Undefined weak syms won't yet be marked as dynamic. */
2328 if (h->dynindx == -1
2329 && !h->forced_local)
2330 {
2331 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2332 return FALSE;
2333 }
2334
2335 if (info->shared
2336 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2337 {
2338 asection *s = htab->elf.splt;
2339 asection *got_s = htab->plt_got;
2340
2341 /* If this is the first .plt entry, make room for the special
2342 first entry. */
2343 if (s->size == 0)
2344 s->size = plt_entry_size;
2345
2346 if (use_plt_got)
2347 eh->plt_got.offset = got_s->size;
2348 else
2349 h->plt.offset = s->size;
2350
2351 /* If this symbol is not defined in a regular file, and we are
2352 not generating a shared library, then set the symbol to this
2353 location in the .plt. This is required to make function
2354 pointers compare as equal between the normal executable and
2355 the shared library. */
2356 if (! info->shared
2357 && !h->def_regular)
2358 {
2359 if (use_plt_got)
2360 {
2361 /* We need to make a call to the entry of the GOT PLT
2362 instead of regular PLT entry. */
2363 h->root.u.def.section = got_s;
2364 h->root.u.def.value = eh->plt_got.offset;
2365 }
2366 else
2367 {
2368 h->root.u.def.section = s;
2369 h->root.u.def.value = h->plt.offset;
2370 }
2371 }
2372
2373 /* Make room for this entry. */
2374 if (use_plt_got)
2375 got_s->size += sizeof (elf_i386_got_plt_entry);
2376 else
2377 {
2378 s->size += plt_entry_size;
2379
2380 /* We also need to make an entry in the .got.plt section,
2381 which will be placed in the .got section by the linker
2382 script. */
2383 htab->elf.sgotplt->size += 4;
2384
2385 /* We also need to make an entry in the .rel.plt section. */
2386 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2387 htab->elf.srelplt->reloc_count++;
2388 }
2389
2390 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2391 && !info->shared)
2392 {
2393 /* VxWorks has a second set of relocations for each PLT entry
2394 in executables. They go in a separate relocation section,
2395 which is processed by the kernel loader. */
2396
2397 /* There are two relocations for the initial PLT entry: an
2398 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2399 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2400
2401 if (h->plt.offset == plt_entry_size)
2402 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2403
2404 /* There are two extra relocations for each subsequent PLT entry:
2405 an R_386_32 relocation for the GOT entry, and an R_386_32
2406 relocation for the PLT entry. */
2407
2408 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2409 }
2410 }
2411 else
2412 {
2413 h->plt.offset = (bfd_vma) -1;
2414 h->needs_plt = 0;
2415 }
2416 }
2417 else
2418 {
2419 h->plt.offset = (bfd_vma) -1;
2420 h->needs_plt = 0;
2421 }
2422
2423 eh->tlsdesc_got = (bfd_vma) -1;
2424
2425 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2426 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2427 if (h->got.refcount > 0
2428 && info->executable
2429 && h->dynindx == -1
2430 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2431 h->got.offset = (bfd_vma) -1;
2432 else if (h->got.refcount > 0)
2433 {
2434 asection *s;
2435 bfd_boolean dyn;
2436 int tls_type = elf_i386_hash_entry(h)->tls_type;
2437
2438 /* Make sure this symbol is output as a dynamic symbol.
2439 Undefined weak syms won't yet be marked as dynamic. */
2440 if (h->dynindx == -1
2441 && !h->forced_local)
2442 {
2443 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2444 return FALSE;
2445 }
2446
2447 s = htab->elf.sgot;
2448 if (GOT_TLS_GDESC_P (tls_type))
2449 {
2450 eh->tlsdesc_got = htab->elf.sgotplt->size
2451 - elf_i386_compute_jump_table_size (htab);
2452 htab->elf.sgotplt->size += 8;
2453 h->got.offset = (bfd_vma) -2;
2454 }
2455 if (! GOT_TLS_GDESC_P (tls_type)
2456 || GOT_TLS_GD_P (tls_type))
2457 {
2458 h->got.offset = s->size;
2459 s->size += 4;
2460 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2461 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2462 s->size += 4;
2463 }
2464 dyn = htab->elf.dynamic_sections_created;
2465 /* R_386_TLS_IE_32 needs one dynamic relocation,
2466 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2467 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2468 need two), R_386_TLS_GD needs one if local symbol and two if
2469 global. */
2470 if (tls_type == GOT_TLS_IE_BOTH)
2471 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2472 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2473 || (tls_type & GOT_TLS_IE))
2474 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2475 else if (GOT_TLS_GD_P (tls_type))
2476 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2477 else if (! GOT_TLS_GDESC_P (tls_type)
2478 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2479 || h->root.type != bfd_link_hash_undefweak)
2480 && (info->shared
2481 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2482 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2483 if (GOT_TLS_GDESC_P (tls_type))
2484 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2485 }
2486 else
2487 h->got.offset = (bfd_vma) -1;
2488
2489 if (eh->dyn_relocs == NULL)
2490 return TRUE;
2491
2492 /* In the shared -Bsymbolic case, discard space allocated for
2493 dynamic pc-relative relocs against symbols which turn out to be
2494 defined in regular objects. For the normal shared case, discard
2495 space for pc-relative relocs that have become local due to symbol
2496 visibility changes. */
2497
2498 if (info->shared)
2499 {
2500 /* The only reloc that uses pc_count is R_386_PC32, which will
2501 appear on a call or on something like ".long foo - .". We
2502 want calls to protected symbols to resolve directly to the
2503 function rather than going via the plt. If people want
2504 function pointer comparisons to work as expected then they
2505 should avoid writing assembly like ".long foo - .". */
2506 if (SYMBOL_CALLS_LOCAL (info, h))
2507 {
2508 struct elf_dyn_relocs **pp;
2509
2510 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2511 {
2512 p->count -= p->pc_count;
2513 p->pc_count = 0;
2514 if (p->count == 0)
2515 *pp = p->next;
2516 else
2517 pp = &p->next;
2518 }
2519 }
2520
2521 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2522 {
2523 struct elf_dyn_relocs **pp;
2524 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2525 {
2526 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2527 *pp = p->next;
2528 else
2529 pp = &p->next;
2530 }
2531 }
2532
2533 /* Also discard relocs on undefined weak syms with non-default
2534 visibility. */
2535 if (eh->dyn_relocs != NULL
2536 && h->root.type == bfd_link_hash_undefweak)
2537 {
2538 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2539 eh->dyn_relocs = NULL;
2540
2541 /* Make sure undefined weak symbols are output as a dynamic
2542 symbol in PIEs. */
2543 else if (h->dynindx == -1
2544 && !h->forced_local)
2545 {
2546 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2547 return FALSE;
2548 }
2549 }
2550 }
2551 else if (ELIMINATE_COPY_RELOCS)
2552 {
2553 /* For the non-shared case, discard space for relocs against
2554 symbols which turn out to need copy relocs or are not
2555 dynamic. */
2556
2557 if (!h->non_got_ref
2558 && ((h->def_dynamic
2559 && !h->def_regular)
2560 || (htab->elf.dynamic_sections_created
2561 && (h->root.type == bfd_link_hash_undefweak
2562 || h->root.type == bfd_link_hash_undefined))))
2563 {
2564 /* Make sure this symbol is output as a dynamic symbol.
2565 Undefined weak syms won't yet be marked as dynamic. */
2566 if (h->dynindx == -1
2567 && !h->forced_local)
2568 {
2569 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2570 return FALSE;
2571 }
2572
2573 /* If that succeeded, we know we'll be keeping all the
2574 relocs. */
2575 if (h->dynindx != -1)
2576 goto keep;
2577 }
2578
2579 eh->dyn_relocs = NULL;
2580
2581 keep: ;
2582 }
2583
2584 /* Finally, allocate space. */
2585 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2586 {
2587 asection *sreloc;
2588
2589 sreloc = elf_section_data (p->sec)->sreloc;
2590
2591 BFD_ASSERT (sreloc != NULL);
2592 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2593 }
2594
2595 return TRUE;
2596 }
2597
2598 /* Allocate space in .plt, .got and associated reloc sections for
2599 local dynamic relocs. */
2600
2601 static bfd_boolean
2602 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2603 {
2604 struct elf_link_hash_entry *h
2605 = (struct elf_link_hash_entry *) *slot;
2606
2607 if (h->type != STT_GNU_IFUNC
2608 || !h->def_regular
2609 || !h->ref_regular
2610 || !h->forced_local
2611 || h->root.type != bfd_link_hash_defined)
2612 abort ();
2613
2614 return elf_i386_allocate_dynrelocs (h, inf);
2615 }
2616
2617 /* Find any dynamic relocs that apply to read-only sections. */
2618
2619 static bfd_boolean
2620 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2621 {
2622 struct elf_i386_link_hash_entry *eh;
2623 struct elf_dyn_relocs *p;
2624
2625 /* Skip local IFUNC symbols. */
2626 if (h->forced_local && h->type == STT_GNU_IFUNC)
2627 return TRUE;
2628
2629 eh = (struct elf_i386_link_hash_entry *) h;
2630 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2631 {
2632 asection *s = p->sec->output_section;
2633
2634 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2635 {
2636 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2637
2638 info->flags |= DF_TEXTREL;
2639
2640 if ((info->warn_shared_textrel && info->shared)
2641 || info->error_textrel)
2642 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2643 p->sec->owner, h->root.root.string,
2644 p->sec);
2645
2646 /* Not an error, just cut short the traversal. */
2647 return FALSE;
2648 }
2649 }
2650 return TRUE;
2651 }
2652
2653 /* Convert
2654 mov foo@GOT(%reg), %reg
2655 to
2656 lea foo@GOTOFF(%reg), %reg
2657 with the local symbol, foo. */
2658
2659 static bfd_boolean
2660 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2661 struct bfd_link_info *link_info)
2662 {
2663 Elf_Internal_Shdr *symtab_hdr;
2664 Elf_Internal_Rela *internal_relocs;
2665 Elf_Internal_Rela *irel, *irelend;
2666 bfd_byte *contents;
2667 struct elf_i386_link_hash_table *htab;
2668 bfd_boolean changed_contents;
2669 bfd_boolean changed_relocs;
2670 bfd_signed_vma *local_got_refcounts;
2671
2672 /* Don't even try to convert non-ELF outputs. */
2673 if (!is_elf_hash_table (link_info->hash))
2674 return FALSE;
2675
2676 /* Nothing to do if there is no need or no output. */
2677 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2678 || sec->need_convert_mov_to_lea == 0
2679 || bfd_is_abs_section (sec->output_section))
2680 return TRUE;
2681
2682 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2683
2684 /* Load the relocations for this section. */
2685 internal_relocs = (_bfd_elf_link_read_relocs
2686 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2687 link_info->keep_memory));
2688 if (internal_relocs == NULL)
2689 return FALSE;
2690
2691 htab = elf_i386_hash_table (link_info);
2692 changed_contents = FALSE;
2693 changed_relocs = FALSE;
2694 local_got_refcounts = elf_local_got_refcounts (abfd);
2695
2696 /* Get the section contents. */
2697 if (elf_section_data (sec)->this_hdr.contents != NULL)
2698 contents = elf_section_data (sec)->this_hdr.contents;
2699 else
2700 {
2701 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2702 goto error_return;
2703 }
2704
2705 irelend = internal_relocs + sec->reloc_count;
2706 for (irel = internal_relocs; irel < irelend; irel++)
2707 {
2708 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2709 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2710 unsigned int indx;
2711 struct elf_link_hash_entry *h;
2712
2713 if (r_type != R_386_GOT32)
2714 continue;
2715
2716 /* Get the symbol referred to by the reloc. */
2717 if (r_symndx < symtab_hdr->sh_info)
2718 {
2719 Elf_Internal_Sym *isym;
2720
2721 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2722 abfd, r_symndx);
2723
2724 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2725 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2726 && irel->r_offset >= 2
2727 && bfd_get_8 (input_bfd,
2728 contents + irel->r_offset - 2) == 0x8b)
2729 {
2730 bfd_put_8 (output_bfd, 0x8d,
2731 contents + irel->r_offset - 2);
2732 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2733 if (local_got_refcounts != NULL
2734 && local_got_refcounts[r_symndx] > 0)
2735 local_got_refcounts[r_symndx] -= 1;
2736 changed_contents = TRUE;
2737 changed_relocs = TRUE;
2738 }
2739 continue;
2740 }
2741
2742 indx = r_symndx - symtab_hdr->sh_info;
2743 h = elf_sym_hashes (abfd)[indx];
2744 BFD_ASSERT (h != NULL);
2745
2746 while (h->root.type == bfd_link_hash_indirect
2747 || h->root.type == bfd_link_hash_warning)
2748 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2749
2750 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2751 optimizing _DYNAMIC since ld.so may use its link-time address. */
2752 if (h->def_regular
2753 && h->type != STT_GNU_IFUNC
2754 && h != htab->elf.hdynamic
2755 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2756 && irel->r_offset >= 2
2757 && bfd_get_8 (input_bfd,
2758 contents + irel->r_offset - 2) == 0x8b)
2759 {
2760 bfd_put_8 (output_bfd, 0x8d,
2761 contents + irel->r_offset - 2);
2762 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2763 if (h->got.refcount > 0)
2764 h->got.refcount -= 1;
2765 changed_contents = TRUE;
2766 changed_relocs = TRUE;
2767 }
2768 }
2769
2770 if (contents != NULL
2771 && elf_section_data (sec)->this_hdr.contents != contents)
2772 {
2773 if (!changed_contents && !link_info->keep_memory)
2774 free (contents);
2775 else
2776 {
2777 /* Cache the section contents for elf_link_input_bfd. */
2778 elf_section_data (sec)->this_hdr.contents = contents;
2779 }
2780 }
2781
2782 if (elf_section_data (sec)->relocs != internal_relocs)
2783 {
2784 if (!changed_relocs)
2785 free (internal_relocs);
2786 else
2787 elf_section_data (sec)->relocs = internal_relocs;
2788 }
2789
2790 return TRUE;
2791
2792 error_return:
2793 if (contents != NULL
2794 && elf_section_data (sec)->this_hdr.contents != contents)
2795 free (contents);
2796 if (internal_relocs != NULL
2797 && elf_section_data (sec)->relocs != internal_relocs)
2798 free (internal_relocs);
2799 return FALSE;
2800 }
2801
2802 /* Set the sizes of the dynamic sections. */
2803
2804 static bfd_boolean
2805 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2806 {
2807 struct elf_i386_link_hash_table *htab;
2808 bfd *dynobj;
2809 asection *s;
2810 bfd_boolean relocs;
2811 bfd *ibfd;
2812
2813 htab = elf_i386_hash_table (info);
2814 if (htab == NULL)
2815 return FALSE;
2816 dynobj = htab->elf.dynobj;
2817 if (dynobj == NULL)
2818 abort ();
2819
2820 if (htab->elf.dynamic_sections_created)
2821 {
2822 /* Set the contents of the .interp section to the interpreter. */
2823 if (info->executable)
2824 {
2825 s = bfd_get_linker_section (dynobj, ".interp");
2826 if (s == NULL)
2827 abort ();
2828 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2829 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2830 }
2831 }
2832
2833 /* Set up .got offsets for local syms, and space for local dynamic
2834 relocs. */
2835 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2836 {
2837 bfd_signed_vma *local_got;
2838 bfd_signed_vma *end_local_got;
2839 char *local_tls_type;
2840 bfd_vma *local_tlsdesc_gotent;
2841 bfd_size_type locsymcount;
2842 Elf_Internal_Shdr *symtab_hdr;
2843 asection *srel;
2844
2845 if (! is_i386_elf (ibfd))
2846 continue;
2847
2848 for (s = ibfd->sections; s != NULL; s = s->next)
2849 {
2850 struct elf_dyn_relocs *p;
2851
2852 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2853 return FALSE;
2854
2855 for (p = ((struct elf_dyn_relocs *)
2856 elf_section_data (s)->local_dynrel);
2857 p != NULL;
2858 p = p->next)
2859 {
2860 if (!bfd_is_abs_section (p->sec)
2861 && bfd_is_abs_section (p->sec->output_section))
2862 {
2863 /* Input section has been discarded, either because
2864 it is a copy of a linkonce section or due to
2865 linker script /DISCARD/, so we'll be discarding
2866 the relocs too. */
2867 }
2868 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2869 && strcmp (p->sec->output_section->name,
2870 ".tls_vars") == 0)
2871 {
2872 /* Relocations in vxworks .tls_vars sections are
2873 handled specially by the loader. */
2874 }
2875 else if (p->count != 0)
2876 {
2877 srel = elf_section_data (p->sec)->sreloc;
2878 srel->size += p->count * sizeof (Elf32_External_Rel);
2879 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2880 && (info->flags & DF_TEXTREL) == 0)
2881 {
2882 info->flags |= DF_TEXTREL;
2883 if ((info->warn_shared_textrel && info->shared)
2884 || info->error_textrel)
2885 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2886 p->sec->owner, p->sec);
2887 }
2888 }
2889 }
2890 }
2891
2892 local_got = elf_local_got_refcounts (ibfd);
2893 if (!local_got)
2894 continue;
2895
2896 symtab_hdr = &elf_symtab_hdr (ibfd);
2897 locsymcount = symtab_hdr->sh_info;
2898 end_local_got = local_got + locsymcount;
2899 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2900 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2901 s = htab->elf.sgot;
2902 srel = htab->elf.srelgot;
2903 for (; local_got < end_local_got;
2904 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2905 {
2906 *local_tlsdesc_gotent = (bfd_vma) -1;
2907 if (*local_got > 0)
2908 {
2909 if (GOT_TLS_GDESC_P (*local_tls_type))
2910 {
2911 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2912 - elf_i386_compute_jump_table_size (htab);
2913 htab->elf.sgotplt->size += 8;
2914 *local_got = (bfd_vma) -2;
2915 }
2916 if (! GOT_TLS_GDESC_P (*local_tls_type)
2917 || GOT_TLS_GD_P (*local_tls_type))
2918 {
2919 *local_got = s->size;
2920 s->size += 4;
2921 if (GOT_TLS_GD_P (*local_tls_type)
2922 || *local_tls_type == GOT_TLS_IE_BOTH)
2923 s->size += 4;
2924 }
2925 if (info->shared
2926 || GOT_TLS_GD_ANY_P (*local_tls_type)
2927 || (*local_tls_type & GOT_TLS_IE))
2928 {
2929 if (*local_tls_type == GOT_TLS_IE_BOTH)
2930 srel->size += 2 * sizeof (Elf32_External_Rel);
2931 else if (GOT_TLS_GD_P (*local_tls_type)
2932 || ! GOT_TLS_GDESC_P (*local_tls_type))
2933 srel->size += sizeof (Elf32_External_Rel);
2934 if (GOT_TLS_GDESC_P (*local_tls_type))
2935 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2936 }
2937 }
2938 else
2939 *local_got = (bfd_vma) -1;
2940 }
2941 }
2942
2943 if (htab->tls_ldm_got.refcount > 0)
2944 {
2945 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2946 relocs. */
2947 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2948 htab->elf.sgot->size += 8;
2949 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2950 }
2951 else
2952 htab->tls_ldm_got.offset = -1;
2953
2954 /* Allocate global sym .plt and .got entries, and space for global
2955 sym dynamic relocs. */
2956 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2957
2958 /* Allocate .plt and .got entries, and space for local symbols. */
2959 htab_traverse (htab->loc_hash_table,
2960 elf_i386_allocate_local_dynrelocs,
2961 info);
2962
2963 /* For every jump slot reserved in the sgotplt, reloc_count is
2964 incremented. However, when we reserve space for TLS descriptors,
2965 it's not incremented, so in order to compute the space reserved
2966 for them, it suffices to multiply the reloc count by the jump
2967 slot size.
2968
2969 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2970 so that R_386_IRELATIVE entries come last. */
2971 if (htab->elf.srelplt)
2972 {
2973 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2974 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2975 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2976 }
2977 else if (htab->elf.irelplt)
2978 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2979
2980
2981 if (htab->elf.sgotplt)
2982 {
2983 /* Don't allocate .got.plt section if there are no GOT nor PLT
2984 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2985 if ((htab->elf.hgot == NULL
2986 || !htab->elf.hgot->ref_regular_nonweak)
2987 && (htab->elf.sgotplt->size
2988 == get_elf_backend_data (output_bfd)->got_header_size)
2989 && (htab->elf.splt == NULL
2990 || htab->elf.splt->size == 0)
2991 && (htab->elf.sgot == NULL
2992 || htab->elf.sgot->size == 0)
2993 && (htab->elf.iplt == NULL
2994 || htab->elf.iplt->size == 0)
2995 && (htab->elf.igotplt == NULL
2996 || htab->elf.igotplt->size == 0))
2997 htab->elf.sgotplt->size = 0;
2998 }
2999
3000
3001 if (htab->plt_eh_frame != NULL
3002 && htab->elf.splt != NULL
3003 && htab->elf.splt->size != 0
3004 && !bfd_is_abs_section (htab->elf.splt->output_section)
3005 && _bfd_elf_eh_frame_present (info))
3006 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3007
3008 /* We now have determined the sizes of the various dynamic sections.
3009 Allocate memory for them. */
3010 relocs = FALSE;
3011 for (s = dynobj->sections; s != NULL; s = s->next)
3012 {
3013 bfd_boolean strip_section = TRUE;
3014
3015 if ((s->flags & SEC_LINKER_CREATED) == 0)
3016 continue;
3017
3018 if (s == htab->elf.splt
3019 || s == htab->elf.sgot)
3020 {
3021 /* Strip this section if we don't need it; see the
3022 comment below. */
3023 /* We'd like to strip these sections if they aren't needed, but if
3024 we've exported dynamic symbols from them we must leave them.
3025 It's too late to tell BFD to get rid of the symbols. */
3026
3027 if (htab->elf.hplt != NULL)
3028 strip_section = FALSE;
3029 }
3030 else if (s == htab->elf.sgotplt
3031 || s == htab->elf.iplt
3032 || s == htab->elf.igotplt
3033 || s == htab->plt_got
3034 || s == htab->plt_eh_frame
3035 || s == htab->sdynbss)
3036 {
3037 /* Strip these too. */
3038 }
3039 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3040 {
3041 if (s->size != 0
3042 && s != htab->elf.srelplt
3043 && s != htab->srelplt2)
3044 relocs = TRUE;
3045
3046 /* We use the reloc_count field as a counter if we need
3047 to copy relocs into the output file. */
3048 s->reloc_count = 0;
3049 }
3050 else
3051 {
3052 /* It's not one of our sections, so don't allocate space. */
3053 continue;
3054 }
3055
3056 if (s->size == 0)
3057 {
3058 /* If we don't need this section, strip it from the
3059 output file. This is mostly to handle .rel.bss and
3060 .rel.plt. We must create both sections in
3061 create_dynamic_sections, because they must be created
3062 before the linker maps input sections to output
3063 sections. The linker does that before
3064 adjust_dynamic_symbol is called, and it is that
3065 function which decides whether anything needs to go
3066 into these sections. */
3067 if (strip_section)
3068 s->flags |= SEC_EXCLUDE;
3069 continue;
3070 }
3071
3072 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3073 continue;
3074
3075 /* Allocate memory for the section contents. We use bfd_zalloc
3076 here in case unused entries are not reclaimed before the
3077 section's contents are written out. This should not happen,
3078 but this way if it does, we get a R_386_NONE reloc instead
3079 of garbage. */
3080 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3081 if (s->contents == NULL)
3082 return FALSE;
3083 }
3084
3085 if (htab->plt_eh_frame != NULL
3086 && htab->plt_eh_frame->contents != NULL)
3087 {
3088 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3089 sizeof (elf_i386_eh_frame_plt));
3090 bfd_put_32 (dynobj, htab->elf.splt->size,
3091 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3092 }
3093
3094 if (htab->elf.dynamic_sections_created)
3095 {
3096 /* Add some entries to the .dynamic section. We fill in the
3097 values later, in elf_i386_finish_dynamic_sections, but we
3098 must add the entries now so that we get the correct size for
3099 the .dynamic section. The DT_DEBUG entry is filled in by the
3100 dynamic linker and used by the debugger. */
3101 #define add_dynamic_entry(TAG, VAL) \
3102 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3103
3104 if (info->executable)
3105 {
3106 if (!add_dynamic_entry (DT_DEBUG, 0))
3107 return FALSE;
3108 }
3109
3110 if (htab->elf.splt->size != 0)
3111 {
3112 if (!add_dynamic_entry (DT_PLTGOT, 0)
3113 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3114 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3115 || !add_dynamic_entry (DT_JMPREL, 0))
3116 return FALSE;
3117 }
3118
3119 if (relocs)
3120 {
3121 if (!add_dynamic_entry (DT_REL, 0)
3122 || !add_dynamic_entry (DT_RELSZ, 0)
3123 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3124 return FALSE;
3125
3126 /* If any dynamic relocs apply to a read-only section,
3127 then we need a DT_TEXTREL entry. */
3128 if ((info->flags & DF_TEXTREL) == 0)
3129 elf_link_hash_traverse (&htab->elf,
3130 elf_i386_readonly_dynrelocs, info);
3131
3132 if ((info->flags & DF_TEXTREL) != 0)
3133 {
3134 if (!add_dynamic_entry (DT_TEXTREL, 0))
3135 return FALSE;
3136 }
3137 }
3138 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3139 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3140 return FALSE;
3141 }
3142 #undef add_dynamic_entry
3143
3144 return TRUE;
3145 }
3146
3147 static bfd_boolean
3148 elf_i386_always_size_sections (bfd *output_bfd,
3149 struct bfd_link_info *info)
3150 {
3151 asection *tls_sec = elf_hash_table (info)->tls_sec;
3152
3153 if (tls_sec)
3154 {
3155 struct elf_link_hash_entry *tlsbase;
3156
3157 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3158 "_TLS_MODULE_BASE_",
3159 FALSE, FALSE, FALSE);
3160
3161 if (tlsbase && tlsbase->type == STT_TLS)
3162 {
3163 struct elf_i386_link_hash_table *htab;
3164 struct bfd_link_hash_entry *bh = NULL;
3165 const struct elf_backend_data *bed
3166 = get_elf_backend_data (output_bfd);
3167
3168 htab = elf_i386_hash_table (info);
3169 if (htab == NULL)
3170 return FALSE;
3171
3172 if (!(_bfd_generic_link_add_one_symbol
3173 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3174 tls_sec, 0, NULL, FALSE,
3175 bed->collect, &bh)))
3176 return FALSE;
3177
3178 htab->tls_module_base = bh;
3179
3180 tlsbase = (struct elf_link_hash_entry *)bh;
3181 tlsbase->def_regular = 1;
3182 tlsbase->other = STV_HIDDEN;
3183 tlsbase->root.linker_def = 1;
3184 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3185 }
3186 }
3187
3188 return TRUE;
3189 }
3190
3191 /* Set the correct type for an x86 ELF section. We do this by the
3192 section name, which is a hack, but ought to work. */
3193
3194 static bfd_boolean
3195 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3196 Elf_Internal_Shdr *hdr,
3197 asection *sec)
3198 {
3199 const char *name;
3200
3201 name = bfd_get_section_name (abfd, sec);
3202
3203 /* This is an ugly, but unfortunately necessary hack that is
3204 needed when producing EFI binaries on x86. It tells
3205 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3206 containing ELF relocation info. We need this hack in order to
3207 be able to generate ELF binaries that can be translated into
3208 EFI applications (which are essentially COFF objects). Those
3209 files contain a COFF ".reloc" section inside an ELFNN object,
3210 which would normally cause BFD to segfault because it would
3211 attempt to interpret this section as containing relocation
3212 entries for section "oc". With this hack enabled, ".reloc"
3213 will be treated as a normal data section, which will avoid the
3214 segfault. However, you won't be able to create an ELFNN binary
3215 with a section named "oc" that needs relocations, but that's
3216 the kind of ugly side-effects you get when detecting section
3217 types based on their names... In practice, this limitation is
3218 unlikely to bite. */
3219 if (strcmp (name, ".reloc") == 0)
3220 hdr->sh_type = SHT_PROGBITS;
3221
3222 return TRUE;
3223 }
3224
3225 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3226 executables. Rather than setting it to the beginning of the TLS
3227 section, we have to set it to the end. This function may be called
3228 multiple times, it is idempotent. */
3229
3230 static void
3231 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3232 {
3233 struct elf_i386_link_hash_table *htab;
3234 struct bfd_link_hash_entry *base;
3235
3236 if (!info->executable)
3237 return;
3238
3239 htab = elf_i386_hash_table (info);
3240 if (htab == NULL)
3241 return;
3242
3243 base = htab->tls_module_base;
3244 if (base == NULL)
3245 return;
3246
3247 base->u.def.value = htab->elf.tls_size;
3248 }
3249
3250 /* Return the base VMA address which should be subtracted from real addresses
3251 when resolving @dtpoff relocation.
3252 This is PT_TLS segment p_vaddr. */
3253
3254 static bfd_vma
3255 elf_i386_dtpoff_base (struct bfd_link_info *info)
3256 {
3257 /* If tls_sec is NULL, we should have signalled an error already. */
3258 if (elf_hash_table (info)->tls_sec == NULL)
3259 return 0;
3260 return elf_hash_table (info)->tls_sec->vma;
3261 }
3262
3263 /* Return the relocation value for @tpoff relocation
3264 if STT_TLS virtual address is ADDRESS. */
3265
3266 static bfd_vma
3267 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3268 {
3269 struct elf_link_hash_table *htab = elf_hash_table (info);
3270 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3271 bfd_vma static_tls_size;
3272
3273 /* If tls_sec is NULL, we should have signalled an error already. */
3274 if (htab->tls_sec == NULL)
3275 return 0;
3276
3277 /* Consider special static TLS alignment requirements. */
3278 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3279 return static_tls_size + htab->tls_sec->vma - address;
3280 }
3281
3282 /* Relocate an i386 ELF section. */
3283
3284 static bfd_boolean
3285 elf_i386_relocate_section (bfd *output_bfd,
3286 struct bfd_link_info *info,
3287 bfd *input_bfd,
3288 asection *input_section,
3289 bfd_byte *contents,
3290 Elf_Internal_Rela *relocs,
3291 Elf_Internal_Sym *local_syms,
3292 asection **local_sections)
3293 {
3294 struct elf_i386_link_hash_table *htab;
3295 Elf_Internal_Shdr *symtab_hdr;
3296 struct elf_link_hash_entry **sym_hashes;
3297 bfd_vma *local_got_offsets;
3298 bfd_vma *local_tlsdesc_gotents;
3299 Elf_Internal_Rela *rel;
3300 Elf_Internal_Rela *relend;
3301 bfd_boolean is_vxworks_tls;
3302 unsigned plt_entry_size;
3303
3304 BFD_ASSERT (is_i386_elf (input_bfd));
3305
3306 htab = elf_i386_hash_table (info);
3307 if (htab == NULL)
3308 return FALSE;
3309 symtab_hdr = &elf_symtab_hdr (input_bfd);
3310 sym_hashes = elf_sym_hashes (input_bfd);
3311 local_got_offsets = elf_local_got_offsets (input_bfd);
3312 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3313 /* We have to handle relocations in vxworks .tls_vars sections
3314 specially, because the dynamic loader is 'weird'. */
3315 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3316 && info->shared
3317 && !strcmp (input_section->output_section->name,
3318 ".tls_vars"));
3319
3320 elf_i386_set_tls_module_base (info);
3321
3322 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3323
3324 rel = relocs;
3325 relend = relocs + input_section->reloc_count;
3326 for (; rel < relend; rel++)
3327 {
3328 unsigned int r_type;
3329 reloc_howto_type *howto;
3330 unsigned long r_symndx;
3331 struct elf_link_hash_entry *h;
3332 struct elf_i386_link_hash_entry *eh;
3333 Elf_Internal_Sym *sym;
3334 asection *sec;
3335 bfd_vma off, offplt, plt_offset;
3336 bfd_vma relocation;
3337 bfd_boolean unresolved_reloc;
3338 bfd_reloc_status_type r;
3339 unsigned int indx;
3340 int tls_type;
3341 bfd_vma st_size;
3342 asection *resolved_plt;
3343
3344 r_type = ELF32_R_TYPE (rel->r_info);
3345 if (r_type == R_386_GNU_VTINHERIT
3346 || r_type == R_386_GNU_VTENTRY)
3347 continue;
3348
3349 if ((indx = r_type) >= R_386_standard
3350 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3351 >= R_386_ext - R_386_standard)
3352 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3353 >= R_386_irelative - R_386_ext))
3354 {
3355 (*_bfd_error_handler)
3356 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3357 input_bfd, input_section, r_type);
3358 bfd_set_error (bfd_error_bad_value);
3359 return FALSE;
3360 }
3361 howto = elf_howto_table + indx;
3362
3363 r_symndx = ELF32_R_SYM (rel->r_info);
3364 h = NULL;
3365 sym = NULL;
3366 sec = NULL;
3367 unresolved_reloc = FALSE;
3368 if (r_symndx < symtab_hdr->sh_info)
3369 {
3370 sym = local_syms + r_symndx;
3371 sec = local_sections[r_symndx];
3372 relocation = (sec->output_section->vma
3373 + sec->output_offset
3374 + sym->st_value);
3375 st_size = sym->st_size;
3376
3377 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3378 && ((sec->flags & SEC_MERGE) != 0
3379 || (info->relocatable
3380 && sec->output_offset != 0)))
3381 {
3382 bfd_vma addend;
3383 bfd_byte *where = contents + rel->r_offset;
3384
3385 switch (howto->size)
3386 {
3387 case 0:
3388 addend = bfd_get_8 (input_bfd, where);
3389 if (howto->pc_relative)
3390 {
3391 addend = (addend ^ 0x80) - 0x80;
3392 addend += 1;
3393 }
3394 break;
3395 case 1:
3396 addend = bfd_get_16 (input_bfd, where);
3397 if (howto->pc_relative)
3398 {
3399 addend = (addend ^ 0x8000) - 0x8000;
3400 addend += 2;
3401 }
3402 break;
3403 case 2:
3404 addend = bfd_get_32 (input_bfd, where);
3405 if (howto->pc_relative)
3406 {
3407 addend = (addend ^ 0x80000000) - 0x80000000;
3408 addend += 4;
3409 }
3410 break;
3411 default:
3412 abort ();
3413 }
3414
3415 if (info->relocatable)
3416 addend += sec->output_offset;
3417 else
3418 {
3419 asection *msec = sec;
3420 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3421 addend);
3422 addend -= relocation;
3423 addend += msec->output_section->vma + msec->output_offset;
3424 }
3425
3426 switch (howto->size)
3427 {
3428 case 0:
3429 /* FIXME: overflow checks. */
3430 if (howto->pc_relative)
3431 addend -= 1;
3432 bfd_put_8 (input_bfd, addend, where);
3433 break;
3434 case 1:
3435 if (howto->pc_relative)
3436 addend -= 2;
3437 bfd_put_16 (input_bfd, addend, where);
3438 break;
3439 case 2:
3440 if (howto->pc_relative)
3441 addend -= 4;
3442 bfd_put_32 (input_bfd, addend, where);
3443 break;
3444 }
3445 }
3446 else if (!info->relocatable
3447 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3448 {
3449 /* Relocate against local STT_GNU_IFUNC symbol. */
3450 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3451 FALSE);
3452 if (h == NULL)
3453 abort ();
3454
3455 /* Set STT_GNU_IFUNC symbol value. */
3456 h->root.u.def.value = sym->st_value;
3457 h->root.u.def.section = sec;
3458 }
3459 }
3460 else
3461 {
3462 bfd_boolean warned ATTRIBUTE_UNUSED;
3463 bfd_boolean ignored ATTRIBUTE_UNUSED;
3464
3465 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3466 r_symndx, symtab_hdr, sym_hashes,
3467 h, sec, relocation,
3468 unresolved_reloc, warned, ignored);
3469 st_size = h->size;
3470 }
3471
3472 if (sec != NULL && discarded_section (sec))
3473 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3474 rel, 1, relend, howto, 0, contents);
3475
3476 if (info->relocatable)
3477 continue;
3478
3479 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3480 it here if it is defined in a non-shared object. */
3481 if (h != NULL
3482 && h->type == STT_GNU_IFUNC
3483 && h->def_regular)
3484 {
3485 asection *plt, *gotplt, *base_got;
3486 bfd_vma plt_index;
3487 const char *name;
3488
3489 if ((input_section->flags & SEC_ALLOC) == 0
3490 || h->plt.offset == (bfd_vma) -1)
3491 abort ();
3492
3493 /* STT_GNU_IFUNC symbol must go through PLT. */
3494 if (htab->elf.splt != NULL)
3495 {
3496 plt = htab->elf.splt;
3497 gotplt = htab->elf.sgotplt;
3498 }
3499 else
3500 {
3501 plt = htab->elf.iplt;
3502 gotplt = htab->elf.igotplt;
3503 }
3504
3505 relocation = (plt->output_section->vma
3506 + plt->output_offset + h->plt.offset);
3507
3508 switch (r_type)
3509 {
3510 default:
3511 if (h->root.root.string)
3512 name = h->root.root.string;
3513 else
3514 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3515 NULL);
3516 (*_bfd_error_handler)
3517 (_("%B: relocation %s against STT_GNU_IFUNC "
3518 "symbol `%s' isn't handled by %s"), input_bfd,
3519 elf_howto_table[r_type].name,
3520 name, __FUNCTION__);
3521 bfd_set_error (bfd_error_bad_value);
3522 return FALSE;
3523
3524 case R_386_32:
3525 /* Generate dynamic relcoation only when there is a
3526 non-GOT reference in a shared object. */
3527 if (info->shared && h->non_got_ref)
3528 {
3529 Elf_Internal_Rela outrel;
3530 asection *sreloc;
3531 bfd_vma offset;
3532
3533 /* Need a dynamic relocation to get the real function
3534 adddress. */
3535 offset = _bfd_elf_section_offset (output_bfd,
3536 info,
3537 input_section,
3538 rel->r_offset);
3539 if (offset == (bfd_vma) -1
3540 || offset == (bfd_vma) -2)
3541 abort ();
3542
3543 outrel.r_offset = (input_section->output_section->vma
3544 + input_section->output_offset
3545 + offset);
3546
3547 if (h->dynindx == -1
3548 || h->forced_local
3549 || info->executable)
3550 {
3551 /* This symbol is resolved locally. */
3552 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3553 bfd_put_32 (output_bfd,
3554 (h->root.u.def.value
3555 + h->root.u.def.section->output_section->vma
3556 + h->root.u.def.section->output_offset),
3557 contents + offset);
3558 }
3559 else
3560 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3561
3562 sreloc = htab->elf.irelifunc;
3563 elf_append_rel (output_bfd, sreloc, &outrel);
3564
3565 /* If this reloc is against an external symbol, we
3566 do not want to fiddle with the addend. Otherwise,
3567 we need to include the symbol value so that it
3568 becomes an addend for the dynamic reloc. For an
3569 internal symbol, we have updated addend. */
3570 continue;
3571 }
3572 /* FALLTHROUGH */
3573 case R_386_PC32:
3574 case R_386_PLT32:
3575 goto do_relocation;
3576
3577 case R_386_GOT32:
3578 base_got = htab->elf.sgot;
3579 off = h->got.offset;
3580
3581 if (base_got == NULL)
3582 abort ();
3583
3584 if (off == (bfd_vma) -1)
3585 {
3586 /* We can't use h->got.offset here to save state, or
3587 even just remember the offset, as finish_dynamic_symbol
3588 would use that as offset into .got. */
3589
3590 if (htab->elf.splt != NULL)
3591 {
3592 plt_index = h->plt.offset / plt_entry_size - 1;
3593 off = (plt_index + 3) * 4;
3594 base_got = htab->elf.sgotplt;
3595 }
3596 else
3597 {
3598 plt_index = h->plt.offset / plt_entry_size;
3599 off = plt_index * 4;
3600 base_got = htab->elf.igotplt;
3601 }
3602
3603 if (h->dynindx == -1
3604 || h->forced_local
3605 || info->symbolic)
3606 {
3607 /* This references the local defitionion. We must
3608 initialize this entry in the global offset table.
3609 Since the offset must always be a multiple of 8,
3610 we use the least significant bit to record
3611 whether we have initialized it already.
3612
3613 When doing a dynamic link, we create a .rela.got
3614 relocation entry to initialize the value. This
3615 is done in the finish_dynamic_symbol routine. */
3616 if ((off & 1) != 0)
3617 off &= ~1;
3618 else
3619 {
3620 bfd_put_32 (output_bfd, relocation,
3621 base_got->contents + off);
3622 h->got.offset |= 1;
3623 }
3624 }
3625
3626 relocation = off;
3627
3628 /* Adjust for static executables. */
3629 if (htab->elf.splt == NULL)
3630 relocation += gotplt->output_offset;
3631 }
3632 else
3633 {
3634 relocation = (base_got->output_section->vma
3635 + base_got->output_offset + off
3636 - gotplt->output_section->vma
3637 - gotplt->output_offset);
3638 /* Adjust for static executables. */
3639 if (htab->elf.splt == NULL)
3640 relocation += gotplt->output_offset;
3641 }
3642
3643 goto do_relocation;
3644
3645 case R_386_GOTOFF:
3646 relocation -= (gotplt->output_section->vma
3647 + gotplt->output_offset);
3648 goto do_relocation;
3649 }
3650 }
3651
3652 switch (r_type)
3653 {
3654 case R_386_GOT32:
3655 /* Relocation is to the entry for this symbol in the global
3656 offset table. */
3657 if (htab->elf.sgot == NULL)
3658 abort ();
3659
3660 if (h != NULL)
3661 {
3662 bfd_boolean dyn;
3663
3664 off = h->got.offset;
3665 dyn = htab->elf.dynamic_sections_created;
3666 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3667 || (info->shared
3668 && SYMBOL_REFERENCES_LOCAL (info, h))
3669 || (ELF_ST_VISIBILITY (h->other)
3670 && h->root.type == bfd_link_hash_undefweak))
3671 {
3672 /* This is actually a static link, or it is a
3673 -Bsymbolic link and the symbol is defined
3674 locally, or the symbol was forced to be local
3675 because of a version file. We must initialize
3676 this entry in the global offset table. Since the
3677 offset must always be a multiple of 4, we use the
3678 least significant bit to record whether we have
3679 initialized it already.
3680
3681 When doing a dynamic link, we create a .rel.got
3682 relocation entry to initialize the value. This
3683 is done in the finish_dynamic_symbol routine. */
3684 if ((off & 1) != 0)
3685 off &= ~1;
3686 else
3687 {
3688 bfd_put_32 (output_bfd, relocation,
3689 htab->elf.sgot->contents + off);
3690 h->got.offset |= 1;
3691 }
3692 }
3693 else
3694 unresolved_reloc = FALSE;
3695 }
3696 else
3697 {
3698 if (local_got_offsets == NULL)
3699 abort ();
3700
3701 off = local_got_offsets[r_symndx];
3702
3703 /* The offset must always be a multiple of 4. We use
3704 the least significant bit to record whether we have
3705 already generated the necessary reloc. */
3706 if ((off & 1) != 0)
3707 off &= ~1;
3708 else
3709 {
3710 bfd_put_32 (output_bfd, relocation,
3711 htab->elf.sgot->contents + off);
3712
3713 if (info->shared)
3714 {
3715 asection *s;
3716 Elf_Internal_Rela outrel;
3717
3718 s = htab->elf.srelgot;
3719 if (s == NULL)
3720 abort ();
3721
3722 outrel.r_offset = (htab->elf.sgot->output_section->vma
3723 + htab->elf.sgot->output_offset
3724 + off);
3725 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3726 elf_append_rel (output_bfd, s, &outrel);
3727 }
3728
3729 local_got_offsets[r_symndx] |= 1;
3730 }
3731 }
3732
3733 if (off >= (bfd_vma) -2)
3734 abort ();
3735
3736 relocation = htab->elf.sgot->output_section->vma
3737 + htab->elf.sgot->output_offset + off
3738 - htab->elf.sgotplt->output_section->vma
3739 - htab->elf.sgotplt->output_offset;
3740 break;
3741
3742 case R_386_GOTOFF:
3743 /* Relocation is relative to the start of the global offset
3744 table. */
3745
3746 /* Check to make sure it isn't a protected function or data
3747 symbol for shared library since it may not be local when
3748 used as function address or with copy relocation. We also
3749 need to make sure that a symbol is referenced locally. */
3750 if (!info->executable && h)
3751 {
3752 if (!h->def_regular)
3753 {
3754 const char *v;
3755
3756 switch (ELF_ST_VISIBILITY (h->other))
3757 {
3758 case STV_HIDDEN:
3759 v = _("hidden symbol");
3760 break;
3761 case STV_INTERNAL:
3762 v = _("internal symbol");
3763 break;
3764 case STV_PROTECTED:
3765 v = _("protected symbol");
3766 break;
3767 default:
3768 v = _("symbol");
3769 break;
3770 }
3771
3772 (*_bfd_error_handler)
3773 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3774 input_bfd, v, h->root.root.string);
3775 bfd_set_error (bfd_error_bad_value);
3776 return FALSE;
3777 }
3778 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3779 && (h->type == STT_FUNC
3780 || h->type == STT_OBJECT)
3781 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3782 {
3783 (*_bfd_error_handler)
3784 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3785 input_bfd,
3786 h->type == STT_FUNC ? "function" : "data",
3787 h->root.root.string);
3788 bfd_set_error (bfd_error_bad_value);
3789 return FALSE;
3790 }
3791 }
3792
3793 /* Note that sgot is not involved in this
3794 calculation. We always want the start of .got.plt. If we
3795 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3796 permitted by the ABI, we might have to change this
3797 calculation. */
3798 relocation -= htab->elf.sgotplt->output_section->vma
3799 + htab->elf.sgotplt->output_offset;
3800 break;
3801
3802 case R_386_GOTPC:
3803 /* Use global offset table as symbol value. */
3804 relocation = htab->elf.sgotplt->output_section->vma
3805 + htab->elf.sgotplt->output_offset;
3806 unresolved_reloc = FALSE;
3807 break;
3808
3809 case R_386_PLT32:
3810 /* Relocation is to the entry for this symbol in the
3811 procedure linkage table. */
3812
3813 /* Resolve a PLT32 reloc against a local symbol directly,
3814 without using the procedure linkage table. */
3815 if (h == NULL)
3816 break;
3817
3818 eh = (struct elf_i386_link_hash_entry *) h;
3819 if ((h->plt.offset == (bfd_vma) -1
3820 && eh->plt_got.offset == (bfd_vma) -1)
3821 || htab->elf.splt == NULL)
3822 {
3823 /* We didn't make a PLT entry for this symbol. This
3824 happens when statically linking PIC code, or when
3825 using -Bsymbolic. */
3826 break;
3827 }
3828
3829 if (h->plt.offset != (bfd_vma) -1)
3830 {
3831 resolved_plt = htab->elf.splt;
3832 plt_offset = h->plt.offset;
3833 }
3834 else
3835 {
3836 resolved_plt = htab->plt_got;
3837 plt_offset = eh->plt_got.offset;
3838 }
3839
3840 relocation = (resolved_plt->output_section->vma
3841 + resolved_plt->output_offset
3842 + plt_offset);
3843 unresolved_reloc = FALSE;
3844 break;
3845
3846 case R_386_SIZE32:
3847 /* Set to symbol size. */
3848 relocation = st_size;
3849 /* Fall through. */
3850
3851 case R_386_32:
3852 case R_386_PC32:
3853 if ((input_section->flags & SEC_ALLOC) == 0
3854 || is_vxworks_tls)
3855 break;
3856
3857 if ((info->shared
3858 && (h == NULL
3859 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3860 || h->root.type != bfd_link_hash_undefweak)
3861 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3862 || !SYMBOL_CALLS_LOCAL (info, h)))
3863 || (ELIMINATE_COPY_RELOCS
3864 && !info->shared
3865 && h != NULL
3866 && h->dynindx != -1
3867 && !h->non_got_ref
3868 && ((h->def_dynamic
3869 && !h->def_regular)
3870 || h->root.type == bfd_link_hash_undefweak
3871 || h->root.type == bfd_link_hash_undefined)))
3872 {
3873 Elf_Internal_Rela outrel;
3874 bfd_boolean skip, relocate;
3875 asection *sreloc;
3876
3877 /* When generating a shared object, these relocations
3878 are copied into the output file to be resolved at run
3879 time. */
3880
3881 skip = FALSE;
3882 relocate = FALSE;
3883
3884 outrel.r_offset =
3885 _bfd_elf_section_offset (output_bfd, info, input_section,
3886 rel->r_offset);
3887 if (outrel.r_offset == (bfd_vma) -1)
3888 skip = TRUE;
3889 else if (outrel.r_offset == (bfd_vma) -2)
3890 skip = TRUE, relocate = TRUE;
3891 outrel.r_offset += (input_section->output_section->vma
3892 + input_section->output_offset);
3893
3894 if (skip)
3895 memset (&outrel, 0, sizeof outrel);
3896 else if (h != NULL
3897 && h->dynindx != -1
3898 && (r_type == R_386_PC32
3899 || !info->shared
3900 || !SYMBOLIC_BIND (info, h)
3901 || !h->def_regular))
3902 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3903 else
3904 {
3905 /* This symbol is local, or marked to become local. */
3906 relocate = TRUE;
3907 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3908 }
3909
3910 sreloc = elf_section_data (input_section)->sreloc;
3911
3912 if (sreloc == NULL || sreloc->contents == NULL)
3913 {
3914 r = bfd_reloc_notsupported;
3915 goto check_relocation_error;
3916 }
3917
3918 elf_append_rel (output_bfd, sreloc, &outrel);
3919
3920 /* If this reloc is against an external symbol, we do
3921 not want to fiddle with the addend. Otherwise, we
3922 need to include the symbol value so that it becomes
3923 an addend for the dynamic reloc. */
3924 if (! relocate)
3925 continue;
3926 }
3927 break;
3928
3929 case R_386_TLS_IE:
3930 if (!info->executable)
3931 {
3932 Elf_Internal_Rela outrel;
3933 asection *sreloc;
3934
3935 outrel.r_offset = rel->r_offset
3936 + input_section->output_section->vma
3937 + input_section->output_offset;
3938 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3939 sreloc = elf_section_data (input_section)->sreloc;
3940 if (sreloc == NULL)
3941 abort ();
3942 elf_append_rel (output_bfd, sreloc, &outrel);
3943 }
3944 /* Fall through */
3945
3946 case R_386_TLS_GD:
3947 case R_386_TLS_GOTDESC:
3948 case R_386_TLS_DESC_CALL:
3949 case R_386_TLS_IE_32:
3950 case R_386_TLS_GOTIE:
3951 tls_type = GOT_UNKNOWN;
3952 if (h == NULL && local_got_offsets)
3953 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3954 else if (h != NULL)
3955 tls_type = elf_i386_hash_entry(h)->tls_type;
3956 if (tls_type == GOT_TLS_IE)
3957 tls_type = GOT_TLS_IE_NEG;
3958
3959 if (! elf_i386_tls_transition (info, input_bfd,
3960 input_section, contents,
3961 symtab_hdr, sym_hashes,
3962 &r_type, tls_type, rel,
3963 relend, h, r_symndx))
3964 return FALSE;
3965
3966 if (r_type == R_386_TLS_LE_32)
3967 {
3968 BFD_ASSERT (! unresolved_reloc);
3969 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3970 {
3971 unsigned int type;
3972 bfd_vma roff;
3973
3974 /* GD->LE transition. */
3975 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3976 if (type == 0x04)
3977 {
3978 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3979 Change it into:
3980 movl %gs:0, %eax; subl $foo@tpoff, %eax
3981 (6 byte form of subl). */
3982 memcpy (contents + rel->r_offset - 3,
3983 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3984 roff = rel->r_offset + 5;
3985 }
3986 else
3987 {
3988 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3989 Change it into:
3990 movl %gs:0, %eax; subl $foo@tpoff, %eax
3991 (6 byte form of subl). */
3992 memcpy (contents + rel->r_offset - 2,
3993 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3994 roff = rel->r_offset + 6;
3995 }
3996 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3997 contents + roff);
3998 /* Skip R_386_PC32/R_386_PLT32. */
3999 rel++;
4000 continue;
4001 }
4002 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4003 {
4004 /* GDesc -> LE transition.
4005 It's originally something like:
4006 leal x@tlsdesc(%ebx), %eax
4007
4008 leal x@ntpoff, %eax
4009
4010 Registers other than %eax may be set up here. */
4011
4012 unsigned int val;
4013 bfd_vma roff;
4014
4015 roff = rel->r_offset;
4016 val = bfd_get_8 (input_bfd, contents + roff - 1);
4017
4018 /* Now modify the instruction as appropriate. */
4019 /* aoliva FIXME: remove the above and xor the byte
4020 below with 0x86. */
4021 bfd_put_8 (output_bfd, val ^ 0x86,
4022 contents + roff - 1);
4023 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4024 contents + roff);
4025 continue;
4026 }
4027 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4028 {
4029 /* GDesc -> LE transition.
4030 It's originally:
4031 call *(%eax)
4032 Turn it into:
4033 xchg %ax,%ax */
4034
4035 bfd_vma roff;
4036
4037 roff = rel->r_offset;
4038 bfd_put_8 (output_bfd, 0x66, contents + roff);
4039 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4040 continue;
4041 }
4042 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4043 {
4044 unsigned int val;
4045
4046 /* IE->LE transition:
4047 Originally it can be one of:
4048 movl foo, %eax
4049 movl foo, %reg
4050 addl foo, %reg
4051 We change it into:
4052 movl $foo, %eax
4053 movl $foo, %reg
4054 addl $foo, %reg. */
4055 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4056 if (val == 0xa1)
4057 {
4058 /* movl foo, %eax. */
4059 bfd_put_8 (output_bfd, 0xb8,
4060 contents + rel->r_offset - 1);
4061 }
4062 else
4063 {
4064 unsigned int type;
4065
4066 type = bfd_get_8 (input_bfd,
4067 contents + rel->r_offset - 2);
4068 switch (type)
4069 {
4070 case 0x8b:
4071 /* movl */
4072 bfd_put_8 (output_bfd, 0xc7,
4073 contents + rel->r_offset - 2);
4074 bfd_put_8 (output_bfd,
4075 0xc0 | ((val >> 3) & 7),
4076 contents + rel->r_offset - 1);
4077 break;
4078 case 0x03:
4079 /* addl */
4080 bfd_put_8 (output_bfd, 0x81,
4081 contents + rel->r_offset - 2);
4082 bfd_put_8 (output_bfd,
4083 0xc0 | ((val >> 3) & 7),
4084 contents + rel->r_offset - 1);
4085 break;
4086 default:
4087 BFD_FAIL ();
4088 break;
4089 }
4090 }
4091 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4092 contents + rel->r_offset);
4093 continue;
4094 }
4095 else
4096 {
4097 unsigned int val, type;
4098
4099 /* {IE_32,GOTIE}->LE transition:
4100 Originally it can be one of:
4101 subl foo(%reg1), %reg2
4102 movl foo(%reg1), %reg2
4103 addl foo(%reg1), %reg2
4104 We change it into:
4105 subl $foo, %reg2
4106 movl $foo, %reg2 (6 byte form)
4107 addl $foo, %reg2. */
4108 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4109 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4110 if (type == 0x8b)
4111 {
4112 /* movl */
4113 bfd_put_8 (output_bfd, 0xc7,
4114 contents + rel->r_offset - 2);
4115 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4116 contents + rel->r_offset - 1);
4117 }
4118 else if (type == 0x2b)
4119 {
4120 /* subl */
4121 bfd_put_8 (output_bfd, 0x81,
4122 contents + rel->r_offset - 2);
4123 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4124 contents + rel->r_offset - 1);
4125 }
4126 else if (type == 0x03)
4127 {
4128 /* addl */
4129 bfd_put_8 (output_bfd, 0x81,
4130 contents + rel->r_offset - 2);
4131 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4132 contents + rel->r_offset - 1);
4133 }
4134 else
4135 BFD_FAIL ();
4136 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4137 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4138 contents + rel->r_offset);
4139 else
4140 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4141 contents + rel->r_offset);
4142 continue;
4143 }
4144 }
4145
4146 if (htab->elf.sgot == NULL)
4147 abort ();
4148
4149 if (h != NULL)
4150 {
4151 off = h->got.offset;
4152 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4153 }
4154 else
4155 {
4156 if (local_got_offsets == NULL)
4157 abort ();
4158
4159 off = local_got_offsets[r_symndx];
4160 offplt = local_tlsdesc_gotents[r_symndx];
4161 }
4162
4163 if ((off & 1) != 0)
4164 off &= ~1;
4165 else
4166 {
4167 Elf_Internal_Rela outrel;
4168 int dr_type;
4169 asection *sreloc;
4170
4171 if (htab->elf.srelgot == NULL)
4172 abort ();
4173
4174 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4175
4176 if (GOT_TLS_GDESC_P (tls_type))
4177 {
4178 bfd_byte *loc;
4179 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4180 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4181 <= htab->elf.sgotplt->size);
4182 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4183 + htab->elf.sgotplt->output_offset
4184 + offplt
4185 + htab->sgotplt_jump_table_size);
4186 sreloc = htab->elf.srelplt;
4187 loc = sreloc->contents;
4188 loc += (htab->next_tls_desc_index++
4189 * sizeof (Elf32_External_Rel));
4190 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4191 <= sreloc->contents + sreloc->size);
4192 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4193 if (indx == 0)
4194 {
4195 BFD_ASSERT (! unresolved_reloc);
4196 bfd_put_32 (output_bfd,
4197 relocation - elf_i386_dtpoff_base (info),
4198 htab->elf.sgotplt->contents + offplt
4199 + htab->sgotplt_jump_table_size + 4);
4200 }
4201 else
4202 {
4203 bfd_put_32 (output_bfd, 0,
4204 htab->elf.sgotplt->contents + offplt
4205 + htab->sgotplt_jump_table_size + 4);
4206 }
4207 }
4208
4209 sreloc = htab->elf.srelgot;
4210
4211 outrel.r_offset = (htab->elf.sgot->output_section->vma
4212 + htab->elf.sgot->output_offset + off);
4213
4214 if (GOT_TLS_GD_P (tls_type))
4215 dr_type = R_386_TLS_DTPMOD32;
4216 else if (GOT_TLS_GDESC_P (tls_type))
4217 goto dr_done;
4218 else if (tls_type == GOT_TLS_IE_POS)
4219 dr_type = R_386_TLS_TPOFF;
4220 else
4221 dr_type = R_386_TLS_TPOFF32;
4222
4223 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4224 bfd_put_32 (output_bfd,
4225 relocation - elf_i386_dtpoff_base (info),
4226 htab->elf.sgot->contents + off);
4227 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4228 bfd_put_32 (output_bfd,
4229 elf_i386_dtpoff_base (info) - relocation,
4230 htab->elf.sgot->contents + off);
4231 else if (dr_type != R_386_TLS_DESC)
4232 bfd_put_32 (output_bfd, 0,
4233 htab->elf.sgot->contents + off);
4234 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4235
4236 elf_append_rel (output_bfd, sreloc, &outrel);
4237
4238 if (GOT_TLS_GD_P (tls_type))
4239 {
4240 if (indx == 0)
4241 {
4242 BFD_ASSERT (! unresolved_reloc);
4243 bfd_put_32 (output_bfd,
4244 relocation - elf_i386_dtpoff_base (info),
4245 htab->elf.sgot->contents + off + 4);
4246 }
4247 else
4248 {
4249 bfd_put_32 (output_bfd, 0,
4250 htab->elf.sgot->contents + off + 4);
4251 outrel.r_info = ELF32_R_INFO (indx,
4252 R_386_TLS_DTPOFF32);
4253 outrel.r_offset += 4;
4254 elf_append_rel (output_bfd, sreloc, &outrel);
4255 }
4256 }
4257 else if (tls_type == GOT_TLS_IE_BOTH)
4258 {
4259 bfd_put_32 (output_bfd,
4260 (indx == 0
4261 ? relocation - elf_i386_dtpoff_base (info)
4262 : 0),
4263 htab->elf.sgot->contents + off + 4);
4264 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4265 outrel.r_offset += 4;
4266 elf_append_rel (output_bfd, sreloc, &outrel);
4267 }
4268
4269 dr_done:
4270 if (h != NULL)
4271 h->got.offset |= 1;
4272 else
4273 local_got_offsets[r_symndx] |= 1;
4274 }
4275
4276 if (off >= (bfd_vma) -2
4277 && ! GOT_TLS_GDESC_P (tls_type))
4278 abort ();
4279 if (r_type == R_386_TLS_GOTDESC
4280 || r_type == R_386_TLS_DESC_CALL)
4281 {
4282 relocation = htab->sgotplt_jump_table_size + offplt;
4283 unresolved_reloc = FALSE;
4284 }
4285 else if (r_type == ELF32_R_TYPE (rel->r_info))
4286 {
4287 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4288 + htab->elf.sgotplt->output_offset;
4289 relocation = htab->elf.sgot->output_section->vma
4290 + htab->elf.sgot->output_offset + off - g_o_t;
4291 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4292 && tls_type == GOT_TLS_IE_BOTH)
4293 relocation += 4;
4294 if (r_type == R_386_TLS_IE)
4295 relocation += g_o_t;
4296 unresolved_reloc = FALSE;
4297 }
4298 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4299 {
4300 unsigned int val, type;
4301 bfd_vma roff;
4302
4303 /* GD->IE transition. */
4304 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4305 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4306 if (type == 0x04)
4307 {
4308 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4309 Change it into:
4310 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4311 val >>= 3;
4312 roff = rel->r_offset - 3;
4313 }
4314 else
4315 {
4316 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4317 Change it into:
4318 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4319 roff = rel->r_offset - 2;
4320 }
4321 memcpy (contents + roff,
4322 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4323 contents[roff + 7] = 0x80 | (val & 7);
4324 /* If foo is used only with foo@gotntpoff(%reg) and
4325 foo@indntpoff, but not with foo@gottpoff(%reg), change
4326 subl $foo@gottpoff(%reg), %eax
4327 into:
4328 addl $foo@gotntpoff(%reg), %eax. */
4329 if (tls_type == GOT_TLS_IE_POS)
4330 contents[roff + 6] = 0x03;
4331 bfd_put_32 (output_bfd,
4332 htab->elf.sgot->output_section->vma
4333 + htab->elf.sgot->output_offset + off
4334 - htab->elf.sgotplt->output_section->vma
4335 - htab->elf.sgotplt->output_offset,
4336 contents + roff + 8);
4337 /* Skip R_386_PLT32. */
4338 rel++;
4339 continue;
4340 }
4341 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4342 {
4343 /* GDesc -> IE transition.
4344 It's originally something like:
4345 leal x@tlsdesc(%ebx), %eax
4346
4347 Change it to:
4348 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4349 or:
4350 movl x@gottpoff(%ebx), %eax # before negl %eax
4351
4352 Registers other than %eax may be set up here. */
4353
4354 bfd_vma roff;
4355
4356 /* First, make sure it's a leal adding ebx to a 32-bit
4357 offset into any register, although it's probably
4358 almost always going to be eax. */
4359 roff = rel->r_offset;
4360
4361 /* Now modify the instruction as appropriate. */
4362 /* To turn a leal into a movl in the form we use it, it
4363 suffices to change the first byte from 0x8d to 0x8b.
4364 aoliva FIXME: should we decide to keep the leal, all
4365 we have to do is remove the statement below, and
4366 adjust the relaxation of R_386_TLS_DESC_CALL. */
4367 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4368
4369 if (tls_type == GOT_TLS_IE_BOTH)
4370 off += 4;
4371
4372 bfd_put_32 (output_bfd,
4373 htab->elf.sgot->output_section->vma
4374 + htab->elf.sgot->output_offset + off
4375 - htab->elf.sgotplt->output_section->vma
4376 - htab->elf.sgotplt->output_offset,
4377 contents + roff);
4378 continue;
4379 }
4380 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4381 {
4382 /* GDesc -> IE transition.
4383 It's originally:
4384 call *(%eax)
4385
4386 Change it to:
4387 xchg %ax,%ax
4388 or
4389 negl %eax
4390 depending on how we transformed the TLS_GOTDESC above.
4391 */
4392
4393 bfd_vma roff;
4394
4395 roff = rel->r_offset;
4396
4397 /* Now modify the instruction as appropriate. */
4398 if (tls_type != GOT_TLS_IE_NEG)
4399 {
4400 /* xchg %ax,%ax */
4401 bfd_put_8 (output_bfd, 0x66, contents + roff);
4402 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4403 }
4404 else
4405 {
4406 /* negl %eax */
4407 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4408 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4409 }
4410
4411 continue;
4412 }
4413 else
4414 BFD_ASSERT (FALSE);
4415 break;
4416
4417 case R_386_TLS_LDM:
4418 if (! elf_i386_tls_transition (info, input_bfd,
4419 input_section, contents,
4420 symtab_hdr, sym_hashes,
4421 &r_type, GOT_UNKNOWN, rel,
4422 relend, h, r_symndx))
4423 return FALSE;
4424
4425 if (r_type != R_386_TLS_LDM)
4426 {
4427 /* LD->LE transition:
4428 leal foo(%reg), %eax; call ___tls_get_addr.
4429 We change it into:
4430 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4431 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4432 memcpy (contents + rel->r_offset - 2,
4433 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4434 /* Skip R_386_PC32/R_386_PLT32. */
4435 rel++;
4436 continue;
4437 }
4438
4439 if (htab->elf.sgot == NULL)
4440 abort ();
4441
4442 off = htab->tls_ldm_got.offset;
4443 if (off & 1)
4444 off &= ~1;
4445 else
4446 {
4447 Elf_Internal_Rela outrel;
4448
4449 if (htab->elf.srelgot == NULL)
4450 abort ();
4451
4452 outrel.r_offset = (htab->elf.sgot->output_section->vma
4453 + htab->elf.sgot->output_offset + off);
4454
4455 bfd_put_32 (output_bfd, 0,
4456 htab->elf.sgot->contents + off);
4457 bfd_put_32 (output_bfd, 0,
4458 htab->elf.sgot->contents + off + 4);
4459 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4460 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4461 htab->tls_ldm_got.offset |= 1;
4462 }
4463 relocation = htab->elf.sgot->output_section->vma
4464 + htab->elf.sgot->output_offset + off
4465 - htab->elf.sgotplt->output_section->vma
4466 - htab->elf.sgotplt->output_offset;
4467 unresolved_reloc = FALSE;
4468 break;
4469
4470 case R_386_TLS_LDO_32:
4471 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4472 relocation -= elf_i386_dtpoff_base (info);
4473 else
4474 /* When converting LDO to LE, we must negate. */
4475 relocation = -elf_i386_tpoff (info, relocation);
4476 break;
4477
4478 case R_386_TLS_LE_32:
4479 case R_386_TLS_LE:
4480 if (!info->executable)
4481 {
4482 Elf_Internal_Rela outrel;
4483 asection *sreloc;
4484
4485 outrel.r_offset = rel->r_offset
4486 + input_section->output_section->vma
4487 + input_section->output_offset;
4488 if (h != NULL && h->dynindx != -1)
4489 indx = h->dynindx;
4490 else
4491 indx = 0;
4492 if (r_type == R_386_TLS_LE_32)
4493 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4494 else
4495 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4496 sreloc = elf_section_data (input_section)->sreloc;
4497 if (sreloc == NULL)
4498 abort ();
4499 elf_append_rel (output_bfd, sreloc, &outrel);
4500 if (indx)
4501 continue;
4502 else if (r_type == R_386_TLS_LE_32)
4503 relocation = elf_i386_dtpoff_base (info) - relocation;
4504 else
4505 relocation -= elf_i386_dtpoff_base (info);
4506 }
4507 else if (r_type == R_386_TLS_LE_32)
4508 relocation = elf_i386_tpoff (info, relocation);
4509 else
4510 relocation = -elf_i386_tpoff (info, relocation);
4511 break;
4512
4513 default:
4514 break;
4515 }
4516
4517 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4518 because such sections are not SEC_ALLOC and thus ld.so will
4519 not process them. */
4520 if (unresolved_reloc
4521 && !((input_section->flags & SEC_DEBUGGING) != 0
4522 && h->def_dynamic)
4523 && _bfd_elf_section_offset (output_bfd, info, input_section,
4524 rel->r_offset) != (bfd_vma) -1)
4525 {
4526 (*_bfd_error_handler)
4527 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4528 input_bfd,
4529 input_section,
4530 (long) rel->r_offset,
4531 howto->name,
4532 h->root.root.string);
4533 return FALSE;
4534 }
4535
4536 do_relocation:
4537 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4538 contents, rel->r_offset,
4539 relocation, 0);
4540
4541 check_relocation_error:
4542 if (r != bfd_reloc_ok)
4543 {
4544 const char *name;
4545
4546 if (h != NULL)
4547 name = h->root.root.string;
4548 else
4549 {
4550 name = bfd_elf_string_from_elf_section (input_bfd,
4551 symtab_hdr->sh_link,
4552 sym->st_name);
4553 if (name == NULL)
4554 return FALSE;
4555 if (*name == '\0')
4556 name = bfd_section_name (input_bfd, sec);
4557 }
4558
4559 if (r == bfd_reloc_overflow)
4560 {
4561 if (! ((*info->callbacks->reloc_overflow)
4562 (info, (h ? &h->root : NULL), name, howto->name,
4563 (bfd_vma) 0, input_bfd, input_section,
4564 rel->r_offset)))
4565 return FALSE;
4566 }
4567 else
4568 {
4569 (*_bfd_error_handler)
4570 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4571 input_bfd, input_section,
4572 (long) rel->r_offset, name, (int) r);
4573 return FALSE;
4574 }
4575 }
4576 }
4577
4578 return TRUE;
4579 }
4580
4581 /* Finish up dynamic symbol handling. We set the contents of various
4582 dynamic sections here. */
4583
4584 static bfd_boolean
4585 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4586 struct bfd_link_info *info,
4587 struct elf_link_hash_entry *h,
4588 Elf_Internal_Sym *sym)
4589 {
4590 struct elf_i386_link_hash_table *htab;
4591 unsigned plt_entry_size;
4592 const struct elf_i386_backend_data *abed;
4593 struct elf_i386_link_hash_entry *eh;
4594
4595 htab = elf_i386_hash_table (info);
4596 if (htab == NULL)
4597 return FALSE;
4598
4599 abed = get_elf_i386_backend_data (output_bfd);
4600 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4601
4602 eh = (struct elf_i386_link_hash_entry *) h;
4603
4604 if (h->plt.offset != (bfd_vma) -1)
4605 {
4606 bfd_vma plt_index;
4607 bfd_vma got_offset;
4608 Elf_Internal_Rela rel;
4609 bfd_byte *loc;
4610 asection *plt, *gotplt, *relplt;
4611
4612 /* When building a static executable, use .iplt, .igot.plt and
4613 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4614 if (htab->elf.splt != NULL)
4615 {
4616 plt = htab->elf.splt;
4617 gotplt = htab->elf.sgotplt;
4618 relplt = htab->elf.srelplt;
4619 }
4620 else
4621 {
4622 plt = htab->elf.iplt;
4623 gotplt = htab->elf.igotplt;
4624 relplt = htab->elf.irelplt;
4625 }
4626
4627 /* This symbol has an entry in the procedure linkage table. Set
4628 it up. */
4629
4630 if ((h->dynindx == -1
4631 && !((h->forced_local || info->executable)
4632 && h->def_regular
4633 && h->type == STT_GNU_IFUNC))
4634 || plt == NULL
4635 || gotplt == NULL
4636 || relplt == NULL)
4637 abort ();
4638
4639 /* Get the index in the procedure linkage table which
4640 corresponds to this symbol. This is the index of this symbol
4641 in all the symbols for which we are making plt entries. The
4642 first entry in the procedure linkage table is reserved.
4643
4644 Get the offset into the .got table of the entry that
4645 corresponds to this function. Each .got entry is 4 bytes.
4646 The first three are reserved.
4647
4648 For static executables, we don't reserve anything. */
4649
4650 if (plt == htab->elf.splt)
4651 {
4652 got_offset = h->plt.offset / plt_entry_size - 1;
4653 got_offset = (got_offset + 3) * 4;
4654 }
4655 else
4656 {
4657 got_offset = h->plt.offset / plt_entry_size;
4658 got_offset = got_offset * 4;
4659 }
4660
4661 /* Fill in the entry in the procedure linkage table. */
4662 if (! info->shared)
4663 {
4664 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4665 abed->plt->plt_entry_size);
4666 bfd_put_32 (output_bfd,
4667 (gotplt->output_section->vma
4668 + gotplt->output_offset
4669 + got_offset),
4670 plt->contents + h->plt.offset
4671 + abed->plt->plt_got_offset);
4672
4673 if (abed->is_vxworks)
4674 {
4675 int s, k, reloc_index;
4676
4677 /* Create the R_386_32 relocation referencing the GOT
4678 for this PLT entry. */
4679
4680 /* S: Current slot number (zero-based). */
4681 s = ((h->plt.offset - abed->plt->plt_entry_size)
4682 / abed->plt->plt_entry_size);
4683 /* K: Number of relocations for PLTResolve. */
4684 if (info->shared)
4685 k = PLTRESOLVE_RELOCS_SHLIB;
4686 else
4687 k = PLTRESOLVE_RELOCS;
4688 /* Skip the PLTresolve relocations, and the relocations for
4689 the other PLT slots. */
4690 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4691 loc = (htab->srelplt2->contents + reloc_index
4692 * sizeof (Elf32_External_Rel));
4693
4694 rel.r_offset = (htab->elf.splt->output_section->vma
4695 + htab->elf.splt->output_offset
4696 + h->plt.offset + 2),
4697 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4698 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4699
4700 /* Create the R_386_32 relocation referencing the beginning of
4701 the PLT for this GOT entry. */
4702 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4703 + htab->elf.sgotplt->output_offset
4704 + got_offset);
4705 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4706 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4707 loc + sizeof (Elf32_External_Rel));
4708 }
4709 }
4710 else
4711 {
4712 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4713 abed->plt->plt_entry_size);
4714 bfd_put_32 (output_bfd, got_offset,
4715 plt->contents + h->plt.offset
4716 + abed->plt->plt_got_offset);
4717 }
4718
4719 /* Fill in the entry in the global offset table. */
4720 bfd_put_32 (output_bfd,
4721 (plt->output_section->vma
4722 + plt->output_offset
4723 + h->plt.offset
4724 + abed->plt->plt_lazy_offset),
4725 gotplt->contents + got_offset);
4726
4727 /* Fill in the entry in the .rel.plt section. */
4728 rel.r_offset = (gotplt->output_section->vma
4729 + gotplt->output_offset
4730 + got_offset);
4731 if (h->dynindx == -1
4732 || ((info->executable
4733 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4734 && h->def_regular
4735 && h->type == STT_GNU_IFUNC))
4736 {
4737 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4738 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4739 in the .got.plt section. */
4740 bfd_put_32 (output_bfd,
4741 (h->root.u.def.value
4742 + h->root.u.def.section->output_section->vma
4743 + h->root.u.def.section->output_offset),
4744 gotplt->contents + got_offset);
4745 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4746 /* R_386_IRELATIVE comes last. */
4747 plt_index = htab->next_irelative_index--;
4748 }
4749 else
4750 {
4751 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4752 plt_index = htab->next_jump_slot_index++;
4753 }
4754 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4755 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4756
4757 /* Don't fill PLT entry for static executables. */
4758 if (plt == htab->elf.splt)
4759 {
4760 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4761 plt->contents + h->plt.offset
4762 + abed->plt->plt_reloc_offset);
4763 bfd_put_32 (output_bfd, - (h->plt.offset
4764 + abed->plt->plt_plt_offset + 4),
4765 plt->contents + h->plt.offset
4766 + abed->plt->plt_plt_offset);
4767 }
4768 }
4769 else if (eh->plt_got.offset != (bfd_vma) -1)
4770 {
4771 bfd_vma got_offset, plt_offset;
4772 asection *plt, *got, *gotplt;
4773 const bfd_byte *got_plt_entry;
4774
4775 /* Offset of displacement of the indirect jump. */
4776 bfd_vma plt_got_offset = 2;
4777
4778 /* Set the entry in the GOT procedure linkage table. */
4779 plt = htab->plt_got;
4780 got = htab->elf.sgot;
4781 gotplt = htab->elf.sgotplt;
4782 got_offset = h->got.offset;
4783
4784 if (got_offset == (bfd_vma) -1
4785 || plt == NULL
4786 || got == NULL
4787 || gotplt == NULL)
4788 abort ();
4789
4790 /* Fill in the entry in the GOT procedure linkage table. */
4791 if (! info->shared)
4792 {
4793 got_plt_entry = elf_i386_got_plt_entry;
4794 got_offset += got->output_section->vma + got->output_offset;
4795 }
4796 else
4797 {
4798 got_plt_entry = elf_i386_pic_got_plt_entry;
4799 got_offset += (got->output_section->vma
4800 + got->output_offset
4801 - gotplt->output_section->vma
4802 - gotplt->output_offset);
4803 }
4804
4805 plt_offset = eh->plt_got.offset;
4806 memcpy (plt->contents + plt_offset, got_plt_entry,
4807 sizeof (elf_i386_got_plt_entry));
4808 bfd_put_32 (output_bfd, got_offset,
4809 plt->contents + plt_offset + plt_got_offset);
4810 }
4811
4812 if (!h->def_regular
4813 && (h->plt.offset != (bfd_vma) -1
4814 || eh->plt_got.offset != (bfd_vma) -1))
4815 {
4816 /* Mark the symbol as undefined, rather than as defined in
4817 the .plt section. Leave the value if there were any
4818 relocations where pointer equality matters (this is a clue
4819 for the dynamic linker, to make function pointer
4820 comparisons work between an application and shared
4821 library), otherwise set it to zero. If a function is only
4822 called from a binary, there is no need to slow down
4823 shared libraries because of that. */
4824 sym->st_shndx = SHN_UNDEF;
4825 if (!h->pointer_equality_needed)
4826 sym->st_value = 0;
4827 }
4828
4829 if (h->got.offset != (bfd_vma) -1
4830 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4831 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4832 {
4833 Elf_Internal_Rela rel;
4834
4835 /* This symbol has an entry in the global offset table. Set it
4836 up. */
4837
4838 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4839 abort ();
4840
4841 rel.r_offset = (htab->elf.sgot->output_section->vma
4842 + htab->elf.sgot->output_offset
4843 + (h->got.offset & ~(bfd_vma) 1));
4844
4845 /* If this is a static link, or it is a -Bsymbolic link and the
4846 symbol is defined locally or was forced to be local because
4847 of a version file, we just want to emit a RELATIVE reloc.
4848 The entry in the global offset table will already have been
4849 initialized in the relocate_section function. */
4850 if (h->def_regular
4851 && h->type == STT_GNU_IFUNC)
4852 {
4853 if (info->shared)
4854 {
4855 /* Generate R_386_GLOB_DAT. */
4856 goto do_glob_dat;
4857 }
4858 else
4859 {
4860 asection *plt;
4861
4862 if (!h->pointer_equality_needed)
4863 abort ();
4864
4865 /* For non-shared object, we can't use .got.plt, which
4866 contains the real function addres if we need pointer
4867 equality. We load the GOT entry with the PLT entry. */
4868 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4869 bfd_put_32 (output_bfd,
4870 (plt->output_section->vma
4871 + plt->output_offset + h->plt.offset),
4872 htab->elf.sgot->contents + h->got.offset);
4873 return TRUE;
4874 }
4875 }
4876 else if (info->shared
4877 && SYMBOL_REFERENCES_LOCAL (info, h))
4878 {
4879 BFD_ASSERT((h->got.offset & 1) != 0);
4880 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4881 }
4882 else
4883 {
4884 BFD_ASSERT((h->got.offset & 1) == 0);
4885 do_glob_dat:
4886 bfd_put_32 (output_bfd, (bfd_vma) 0,
4887 htab->elf.sgot->contents + h->got.offset);
4888 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4889 }
4890
4891 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4892 }
4893
4894 if (h->needs_copy)
4895 {
4896 Elf_Internal_Rela rel;
4897
4898 /* This symbol needs a copy reloc. Set it up. */
4899
4900 if (h->dynindx == -1
4901 || (h->root.type != bfd_link_hash_defined
4902 && h->root.type != bfd_link_hash_defweak)
4903 || htab->srelbss == NULL)
4904 abort ();
4905
4906 rel.r_offset = (h->root.u.def.value
4907 + h->root.u.def.section->output_section->vma
4908 + h->root.u.def.section->output_offset);
4909 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4910 elf_append_rel (output_bfd, htab->srelbss, &rel);
4911 }
4912
4913 return TRUE;
4914 }
4915
4916 /* Finish up local dynamic symbol handling. We set the contents of
4917 various dynamic sections here. */
4918
4919 static bfd_boolean
4920 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4921 {
4922 struct elf_link_hash_entry *h
4923 = (struct elf_link_hash_entry *) *slot;
4924 struct bfd_link_info *info
4925 = (struct bfd_link_info *) inf;
4926
4927 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4928 h, NULL);
4929 }
4930
4931 /* Used to decide how to sort relocs in an optimal manner for the
4932 dynamic linker, before writing them out. */
4933
4934 static enum elf_reloc_type_class
4935 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4936 const asection *rel_sec ATTRIBUTE_UNUSED,
4937 const Elf_Internal_Rela *rela)
4938 {
4939 switch (ELF32_R_TYPE (rela->r_info))
4940 {
4941 case R_386_RELATIVE:
4942 return reloc_class_relative;
4943 case R_386_JUMP_SLOT:
4944 return reloc_class_plt;
4945 case R_386_COPY:
4946 return reloc_class_copy;
4947 default:
4948 return reloc_class_normal;
4949 }
4950 }
4951
4952 /* Finish up the dynamic sections. */
4953
4954 static bfd_boolean
4955 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4956 struct bfd_link_info *info)
4957 {
4958 struct elf_i386_link_hash_table *htab;
4959 bfd *dynobj;
4960 asection *sdyn;
4961 const struct elf_i386_backend_data *abed;
4962
4963 htab = elf_i386_hash_table (info);
4964 if (htab == NULL)
4965 return FALSE;
4966
4967 dynobj = htab->elf.dynobj;
4968 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4969 abed = get_elf_i386_backend_data (output_bfd);
4970
4971 if (htab->elf.dynamic_sections_created)
4972 {
4973 Elf32_External_Dyn *dyncon, *dynconend;
4974
4975 if (sdyn == NULL || htab->elf.sgot == NULL)
4976 abort ();
4977
4978 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4979 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4980 for (; dyncon < dynconend; dyncon++)
4981 {
4982 Elf_Internal_Dyn dyn;
4983 asection *s;
4984
4985 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4986
4987 switch (dyn.d_tag)
4988 {
4989 default:
4990 if (abed->is_vxworks
4991 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4992 break;
4993 continue;
4994
4995 case DT_PLTGOT:
4996 s = htab->elf.sgotplt;
4997 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4998 break;
4999
5000 case DT_JMPREL:
5001 s = htab->elf.srelplt;
5002 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5003 break;
5004
5005 case DT_PLTRELSZ:
5006 s = htab->elf.srelplt;
5007 dyn.d_un.d_val = s->size;
5008 break;
5009
5010 case DT_RELSZ:
5011 /* My reading of the SVR4 ABI indicates that the
5012 procedure linkage table relocs (DT_JMPREL) should be
5013 included in the overall relocs (DT_REL). This is
5014 what Solaris does. However, UnixWare can not handle
5015 that case. Therefore, we override the DT_RELSZ entry
5016 here to make it not include the JMPREL relocs. */
5017 s = htab->elf.srelplt;
5018 if (s == NULL)
5019 continue;
5020 dyn.d_un.d_val -= s->size;
5021 break;
5022
5023 case DT_REL:
5024 /* We may not be using the standard ELF linker script.
5025 If .rel.plt is the first .rel section, we adjust
5026 DT_REL to not include it. */
5027 s = htab->elf.srelplt;
5028 if (s == NULL)
5029 continue;
5030 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5031 continue;
5032 dyn.d_un.d_ptr += s->size;
5033 break;
5034 }
5035
5036 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5037 }
5038
5039 /* Fill in the first entry in the procedure linkage table. */
5040 if (htab->elf.splt && htab->elf.splt->size > 0)
5041 {
5042 if (info->shared)
5043 {
5044 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5045 abed->plt->plt0_entry_size);
5046 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5047 abed->plt0_pad_byte,
5048 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5049 }
5050 else
5051 {
5052 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5053 abed->plt->plt0_entry_size);
5054 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5055 abed->plt0_pad_byte,
5056 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5057 bfd_put_32 (output_bfd,
5058 (htab->elf.sgotplt->output_section->vma
5059 + htab->elf.sgotplt->output_offset
5060 + 4),
5061 htab->elf.splt->contents
5062 + abed->plt->plt0_got1_offset);
5063 bfd_put_32 (output_bfd,
5064 (htab->elf.sgotplt->output_section->vma
5065 + htab->elf.sgotplt->output_offset
5066 + 8),
5067 htab->elf.splt->contents
5068 + abed->plt->plt0_got2_offset);
5069
5070 if (abed->is_vxworks)
5071 {
5072 Elf_Internal_Rela rel;
5073
5074 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5075 On IA32 we use REL relocations so the addend goes in
5076 the PLT directly. */
5077 rel.r_offset = (htab->elf.splt->output_section->vma
5078 + htab->elf.splt->output_offset
5079 + abed->plt->plt0_got1_offset);
5080 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5081 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5082 htab->srelplt2->contents);
5083 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5084 rel.r_offset = (htab->elf.splt->output_section->vma
5085 + htab->elf.splt->output_offset
5086 + abed->plt->plt0_got2_offset);
5087 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5088 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5089 htab->srelplt2->contents +
5090 sizeof (Elf32_External_Rel));
5091 }
5092 }
5093
5094 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5095 really seem like the right value. */
5096 elf_section_data (htab->elf.splt->output_section)
5097 ->this_hdr.sh_entsize = 4;
5098
5099 /* Correct the .rel.plt.unloaded relocations. */
5100 if (abed->is_vxworks && !info->shared)
5101 {
5102 int num_plts = (htab->elf.splt->size
5103 / abed->plt->plt_entry_size) - 1;
5104 unsigned char *p;
5105
5106 p = htab->srelplt2->contents;
5107 if (info->shared)
5108 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5109 else
5110 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5111
5112 for (; num_plts; num_plts--)
5113 {
5114 Elf_Internal_Rela rel;
5115 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5116 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5117 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5118 p += sizeof (Elf32_External_Rel);
5119
5120 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5121 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5122 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5123 p += sizeof (Elf32_External_Rel);
5124 }
5125 }
5126 }
5127 }
5128
5129 if (htab->elf.sgotplt)
5130 {
5131 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5132 {
5133 (*_bfd_error_handler)
5134 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5135 return FALSE;
5136 }
5137
5138 /* Fill in the first three entries in the global offset table. */
5139 if (htab->elf.sgotplt->size > 0)
5140 {
5141 bfd_put_32 (output_bfd,
5142 (sdyn == NULL ? 0
5143 : sdyn->output_section->vma + sdyn->output_offset),
5144 htab->elf.sgotplt->contents);
5145 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5146 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5147 }
5148
5149 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5150 }
5151
5152 /* Adjust .eh_frame for .plt section. */
5153 if (htab->plt_eh_frame != NULL
5154 && htab->plt_eh_frame->contents != NULL)
5155 {
5156 if (htab->elf.splt != NULL
5157 && htab->elf.splt->size != 0
5158 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5159 && htab->elf.splt->output_section != NULL
5160 && htab->plt_eh_frame->output_section != NULL)
5161 {
5162 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5163 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5164 + htab->plt_eh_frame->output_offset
5165 + PLT_FDE_START_OFFSET;
5166 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5167 htab->plt_eh_frame->contents
5168 + PLT_FDE_START_OFFSET);
5169 }
5170 if (htab->plt_eh_frame->sec_info_type
5171 == SEC_INFO_TYPE_EH_FRAME)
5172 {
5173 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5174 htab->plt_eh_frame,
5175 htab->plt_eh_frame->contents))
5176 return FALSE;
5177 }
5178 }
5179
5180 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5181 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5182
5183 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5184 htab_traverse (htab->loc_hash_table,
5185 elf_i386_finish_local_dynamic_symbol,
5186 info);
5187
5188 return TRUE;
5189 }
5190
5191 /* Return an array of PLT entry symbol values. */
5192
5193 static bfd_vma *
5194 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5195 asection *relplt)
5196 {
5197 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5198 arelent *p;
5199 long count, i;
5200 bfd_vma *plt_sym_val;
5201 bfd_vma plt_offset;
5202 bfd_byte *plt_contents;
5203 const struct elf_i386_backend_data *bed
5204 = get_elf_i386_backend_data (abfd);
5205 Elf_Internal_Shdr *hdr;
5206
5207 /* Get the .plt section contents. */
5208 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5209 if (plt_contents == NULL)
5210 return NULL;
5211 if (!bfd_get_section_contents (abfd, (asection *) plt,
5212 plt_contents, 0, plt->size))
5213 {
5214 bad_return:
5215 free (plt_contents);
5216 return NULL;
5217 }
5218
5219 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5220 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5221 goto bad_return;
5222
5223 hdr = &elf_section_data (relplt)->this_hdr;
5224 count = relplt->size / hdr->sh_entsize;
5225
5226 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5227 if (plt_sym_val == NULL)
5228 goto bad_return;
5229
5230 for (i = 0; i < count; i++)
5231 plt_sym_val[i] = -1;
5232
5233 plt_offset = bed->plt->plt_entry_size;
5234 p = relplt->relocation;
5235 for (i = 0; i < count; i++, p++)
5236 {
5237 long reloc_index;
5238
5239 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5240 if (p->howto == NULL)
5241 continue;
5242
5243 if (p->howto->type != R_386_JUMP_SLOT
5244 && p->howto->type != R_386_IRELATIVE)
5245 continue;
5246
5247 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5248 + bed->plt->plt_reloc_offset));
5249 reloc_index /= sizeof (Elf32_External_Rel);
5250 if (reloc_index >= count)
5251 abort ();
5252 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5253 plt_offset += bed->plt->plt_entry_size;
5254 }
5255
5256 free (plt_contents);
5257
5258 return plt_sym_val;
5259 }
5260
5261 /* Similar to _bfd_elf_get_synthetic_symtab. */
5262
5263 static long
5264 elf_i386_get_synthetic_symtab (bfd *abfd,
5265 long symcount,
5266 asymbol **syms,
5267 long dynsymcount,
5268 asymbol **dynsyms,
5269 asymbol **ret)
5270 {
5271 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5272 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5273 dynsymcount, dynsyms, ret,
5274 plt,
5275 elf_i386_get_plt_sym_val);
5276 }
5277
5278 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5279
5280 static bfd_boolean
5281 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5282 {
5283 if (h->plt.offset != (bfd_vma) -1
5284 && !h->def_regular
5285 && !h->pointer_equality_needed)
5286 return FALSE;
5287
5288 return _bfd_elf_hash_symbol (h);
5289 }
5290
5291 /* Hook called by the linker routine which adds symbols from an object
5292 file. */
5293
5294 static bfd_boolean
5295 elf_i386_add_symbol_hook (bfd * abfd,
5296 struct bfd_link_info * info,
5297 Elf_Internal_Sym * sym,
5298 const char ** namep ATTRIBUTE_UNUSED,
5299 flagword * flagsp ATTRIBUTE_UNUSED,
5300 asection ** secp ATTRIBUTE_UNUSED,
5301 bfd_vma * valp ATTRIBUTE_UNUSED)
5302 {
5303 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5304 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5305 && (abfd->flags & DYNAMIC) == 0
5306 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5307 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5308
5309 return TRUE;
5310 }
5311
5312 #define TARGET_LITTLE_SYM i386_elf32_vec
5313 #define TARGET_LITTLE_NAME "elf32-i386"
5314 #define ELF_ARCH bfd_arch_i386
5315 #define ELF_TARGET_ID I386_ELF_DATA
5316 #define ELF_MACHINE_CODE EM_386
5317 #define ELF_MAXPAGESIZE 0x1000
5318
5319 #define elf_backend_can_gc_sections 1
5320 #define elf_backend_can_refcount 1
5321 #define elf_backend_want_got_plt 1
5322 #define elf_backend_plt_readonly 1
5323 #define elf_backend_want_plt_sym 0
5324 #define elf_backend_got_header_size 12
5325 #define elf_backend_plt_alignment 4
5326 #define elf_backend_extern_protected_data 1
5327
5328 /* Support RELA for objdump of prelink objects. */
5329 #define elf_info_to_howto elf_i386_info_to_howto_rel
5330 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5331
5332 #define bfd_elf32_mkobject elf_i386_mkobject
5333
5334 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5335 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5336 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5337 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5338 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5339
5340 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5341 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5342 #define elf_backend_check_relocs elf_i386_check_relocs
5343 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5344 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5345 #define elf_backend_fake_sections elf_i386_fake_sections
5346 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5347 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5348 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5349 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5350 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5351 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5352 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5353 #define elf_backend_relocate_section elf_i386_relocate_section
5354 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5355 #define elf_backend_always_size_sections elf_i386_always_size_sections
5356 #define elf_backend_omit_section_dynsym \
5357 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5358 #define elf_backend_hash_symbol elf_i386_hash_symbol
5359 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5360
5361 #include "elf32-target.h"
5362
5363 /* FreeBSD support. */
5364
5365 #undef TARGET_LITTLE_SYM
5366 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5367 #undef TARGET_LITTLE_NAME
5368 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5369 #undef ELF_OSABI
5370 #define ELF_OSABI ELFOSABI_FREEBSD
5371
5372 /* The kernel recognizes executables as valid only if they carry a
5373 "FreeBSD" label in the ELF header. So we put this label on all
5374 executables and (for simplicity) also all other object files. */
5375
5376 static void
5377 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5378 {
5379 _bfd_elf_post_process_headers (abfd, info);
5380
5381 #ifdef OLD_FREEBSD_ABI_LABEL
5382 {
5383 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5384 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5385 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5386 }
5387 #endif
5388 }
5389
5390 #undef elf_backend_post_process_headers
5391 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5392 #undef elf32_bed
5393 #define elf32_bed elf32_i386_fbsd_bed
5394
5395 #undef elf_backend_add_symbol_hook
5396
5397 #include "elf32-target.h"
5398
5399 /* Solaris 2. */
5400
5401 #undef TARGET_LITTLE_SYM
5402 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5403 #undef TARGET_LITTLE_NAME
5404 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5405
5406 #undef elf_backend_post_process_headers
5407
5408 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5409 objects won't be recognized. */
5410 #undef ELF_OSABI
5411
5412 #undef elf32_bed
5413 #define elf32_bed elf32_i386_sol2_bed
5414
5415 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5416 boundary. */
5417 #undef elf_backend_static_tls_alignment
5418 #define elf_backend_static_tls_alignment 8
5419
5420 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5421
5422 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5423 File, p.63. */
5424 #undef elf_backend_want_plt_sym
5425 #define elf_backend_want_plt_sym 1
5426
5427 #include "elf32-target.h"
5428
5429 /* Native Client support. */
5430
5431 #undef TARGET_LITTLE_SYM
5432 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5433 #undef TARGET_LITTLE_NAME
5434 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5435 #undef elf32_bed
5436 #define elf32_bed elf32_i386_nacl_bed
5437
5438 #undef ELF_MAXPAGESIZE
5439 #define ELF_MAXPAGESIZE 0x10000
5440
5441 /* Restore defaults. */
5442 #undef ELF_OSABI
5443 #undef elf_backend_want_plt_sym
5444 #define elf_backend_want_plt_sym 0
5445 #undef elf_backend_post_process_headers
5446 #undef elf_backend_static_tls_alignment
5447
5448 /* NaCl uses substantially different PLT entries for the same effects. */
5449
5450 #undef elf_backend_plt_alignment
5451 #define elf_backend_plt_alignment 5
5452 #define NACL_PLT_ENTRY_SIZE 64
5453 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5454
5455 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5456 {
5457 0xff, 0x35, /* pushl contents of address */
5458 0, 0, 0, 0, /* replaced with address of .got + 4. */
5459 0x8b, 0x0d, /* movl contents of address, %ecx */
5460 0, 0, 0, 0, /* replaced with address of .got + 8. */
5461 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5462 0xff, 0xe1 /* jmp *%ecx */
5463 };
5464
5465 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5466 {
5467 0x8b, 0x0d, /* movl contents of address, %ecx */
5468 0, 0, 0, 0, /* replaced with GOT slot address. */
5469 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5470 0xff, 0xe1, /* jmp *%ecx */
5471
5472 /* Pad to the next 32-byte boundary with nop instructions. */
5473 0x90,
5474 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5475 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5476
5477 /* Lazy GOT entries point here (32-byte aligned). */
5478 0x68, /* pushl immediate */
5479 0, 0, 0, 0, /* replaced with reloc offset. */
5480 0xe9, /* jmp relative */
5481 0, 0, 0, 0, /* replaced with offset to .plt. */
5482
5483 /* Pad to the next 32-byte boundary with nop instructions. */
5484 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5485 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5486 0x90, 0x90
5487 };
5488
5489 static const bfd_byte
5490 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5491 {
5492 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5493 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5494 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5495 0xff, 0xe1, /* jmp *%ecx */
5496
5497 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5498 so pad to that size with nop instructions. */
5499 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5500 };
5501
5502 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5503 {
5504 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5505 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5506 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5507 0xff, 0xe1, /* jmp *%ecx */
5508
5509 /* Pad to the next 32-byte boundary with nop instructions. */
5510 0x90,
5511 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5512 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5513
5514 /* Lazy GOT entries point here (32-byte aligned). */
5515 0x68, /* pushl immediate */
5516 0, 0, 0, 0, /* replaced with offset into relocation table. */
5517 0xe9, /* jmp relative */
5518 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5519
5520 /* Pad to the next 32-byte boundary with nop instructions. */
5521 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5522 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5523 0x90, 0x90
5524 };
5525
5526 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5527 {
5528 #if (PLT_CIE_LENGTH != 20 \
5529 || PLT_FDE_LENGTH != 36 \
5530 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5531 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5532 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5533 #endif
5534 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5535 0, 0, 0, 0, /* CIE ID */
5536 1, /* CIE version */
5537 'z', 'R', 0, /* Augmentation string */
5538 1, /* Code alignment factor */
5539 0x7c, /* Data alignment factor: -4 */
5540 8, /* Return address column */
5541 1, /* Augmentation size */
5542 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5543 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5544 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5545 DW_CFA_nop, DW_CFA_nop,
5546
5547 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5548 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5549 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5550 0, 0, 0, 0, /* .plt size goes here */
5551 0, /* Augmentation size */
5552 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5553 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5554 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5555 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5556 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5557 13, /* Block length */
5558 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5559 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5560 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5561 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5562 DW_CFA_nop, DW_CFA_nop
5563 };
5564
5565 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5566 {
5567 elf_i386_nacl_plt0_entry, /* plt0_entry */
5568 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5569 2, /* plt0_got1_offset */
5570 8, /* plt0_got2_offset */
5571 elf_i386_nacl_plt_entry, /* plt_entry */
5572 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5573 2, /* plt_got_offset */
5574 33, /* plt_reloc_offset */
5575 38, /* plt_plt_offset */
5576 32, /* plt_lazy_offset */
5577 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5578 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5579 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5580 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5581 };
5582
5583 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5584 {
5585 &elf_i386_nacl_plt, /* plt */
5586 0x90, /* plt0_pad_byte: nop insn */
5587 0, /* is_vxworks */
5588 };
5589
5590 static bfd_boolean
5591 elf32_i386_nacl_elf_object_p (bfd *abfd)
5592 {
5593 /* Set the right machine number for a NaCl i386 ELF32 file. */
5594 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5595 return TRUE;
5596 }
5597
5598 #undef elf_backend_arch_data
5599 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5600
5601 #undef elf_backend_object_p
5602 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5603 #undef elf_backend_modify_segment_map
5604 #define elf_backend_modify_segment_map nacl_modify_segment_map
5605 #undef elf_backend_modify_program_headers
5606 #define elf_backend_modify_program_headers nacl_modify_program_headers
5607 #undef elf_backend_final_write_processing
5608 #define elf_backend_final_write_processing nacl_final_write_processing
5609
5610 #include "elf32-target.h"
5611
5612 /* Restore defaults. */
5613 #undef elf_backend_object_p
5614 #undef elf_backend_modify_segment_map
5615 #undef elf_backend_modify_program_headers
5616 #undef elf_backend_final_write_processing
5617
5618 /* VxWorks support. */
5619
5620 #undef TARGET_LITTLE_SYM
5621 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5622 #undef TARGET_LITTLE_NAME
5623 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5624 #undef ELF_OSABI
5625 #undef elf_backend_plt_alignment
5626 #define elf_backend_plt_alignment 4
5627
5628 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5629 {
5630 &elf_i386_plt, /* plt */
5631 0x90, /* plt0_pad_byte */
5632 1, /* is_vxworks */
5633 };
5634
5635 #undef elf_backend_arch_data
5636 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5637
5638 #undef elf_backend_relocs_compatible
5639 #undef elf_backend_add_symbol_hook
5640 #define elf_backend_add_symbol_hook \
5641 elf_vxworks_add_symbol_hook
5642 #undef elf_backend_link_output_symbol_hook
5643 #define elf_backend_link_output_symbol_hook \
5644 elf_vxworks_link_output_symbol_hook
5645 #undef elf_backend_emit_relocs
5646 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5647 #undef elf_backend_final_write_processing
5648 #define elf_backend_final_write_processing \
5649 elf_vxworks_final_write_processing
5650 #undef elf_backend_static_tls_alignment
5651
5652 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5653 define it. */
5654 #undef elf_backend_want_plt_sym
5655 #define elf_backend_want_plt_sym 1
5656
5657 #undef elf32_bed
5658 #define elf32_bed elf32_i386_vxworks_bed
5659
5660 #include "elf32-target.h"
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