Replace input_bfd and output_bfd with abfd
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32
33 /* 386 uses REL relocations instead of RELA. */
34 #define USE_REL 1
35
36 #include "elf/i386.h"
37
38 static reloc_howto_type elf_howto_table[]=
39 {
40 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
73
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
112
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
135 bfd_elf_generic_reloc, "R_386_SIZE32",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_VTABLE_INHERIT:
336 TRACE ("BFD_RELOC_VTABLE_INHERIT");
337 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
338
339 case BFD_RELOC_VTABLE_ENTRY:
340 TRACE ("BFD_RELOC_VTABLE_ENTRY");
341 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
342
343 default:
344 break;
345 }
346
347 TRACE ("Unknown");
348 return 0;
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_irelative - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
376 >= R_386_vt - R_386_irelative))
377 {
378 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
379 abfd, (int) r_type);
380 indx = R_386_NONE;
381 }
382 /* PR 17512: file: 0f67f69d. */
383 if (elf_howto_table [indx].type != r_type)
384 return NULL;
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* Entries in the GOT procedure linkage table look like this. */
586
587 static const bfd_byte elf_i386_got_plt_entry[8] =
588 {
589 0xff, 0x25, /* jmp indirect */
590 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
591 0x66, 0x90 /* xchg %ax,%ax */
592 };
593
594 /* Entries in the PIC GOT procedure linkage table look like this. */
595
596 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
597 {
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* .eh_frame covering the .plt section. */
604
605 static const bfd_byte elf_i386_eh_frame_plt[] =
606 {
607 #define PLT_CIE_LENGTH 20
608 #define PLT_FDE_LENGTH 36
609 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
610 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
611 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
612 0, 0, 0, 0, /* CIE ID */
613 1, /* CIE version */
614 'z', 'R', 0, /* Augmentation string */
615 1, /* Code alignment factor */
616 0x7c, /* Data alignment factor */
617 8, /* Return address column */
618 1, /* Augmentation size */
619 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
620 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
621 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
622 DW_CFA_nop, DW_CFA_nop,
623
624 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
625 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
626 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
627 0, 0, 0, 0, /* .plt size goes here */
628 0, /* Augmentation size */
629 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
630 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
631 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
632 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
633 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
634 11, /* Block length */
635 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
636 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
637 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
638 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
639 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
640 };
641
642 struct elf_i386_plt_layout
643 {
644 /* The first entry in an absolute procedure linkage table looks like this. */
645 const bfd_byte *plt0_entry;
646 unsigned int plt0_entry_size;
647
648 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
649 unsigned int plt0_got1_offset;
650 unsigned int plt0_got2_offset;
651
652 /* Later entries in an absolute procedure linkage table look like this. */
653 const bfd_byte *plt_entry;
654 unsigned int plt_entry_size;
655
656 /* Offsets into plt_entry that are to be replaced with... */
657 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
658 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
659 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
660
661 /* Offset into plt_entry where the initial value of the GOT entry points. */
662 unsigned int plt_lazy_offset;
663
664 /* The first entry in a PIC procedure linkage table looks like this. */
665 const bfd_byte *pic_plt0_entry;
666
667 /* Subsequent entries in a PIC procedure linkage table look like this. */
668 const bfd_byte *pic_plt_entry;
669
670 /* .eh_frame covering the .plt section. */
671 const bfd_byte *eh_frame_plt;
672 unsigned int eh_frame_plt_size;
673 };
674
675 #define GET_PLT_ENTRY_SIZE(abfd) \
676 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
677
678 /* These are the standard parameters. */
679 static const struct elf_i386_plt_layout elf_i386_plt =
680 {
681 elf_i386_plt0_entry, /* plt0_entry */
682 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
683 2, /* plt0_got1_offset */
684 8, /* plt0_got2_offset */
685 elf_i386_plt_entry, /* plt_entry */
686 PLT_ENTRY_SIZE, /* plt_entry_size */
687 2, /* plt_got_offset */
688 7, /* plt_reloc_offset */
689 12, /* plt_plt_offset */
690 6, /* plt_lazy_offset */
691 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
692 elf_i386_pic_plt_entry, /* pic_plt_entry */
693 elf_i386_eh_frame_plt, /* eh_frame_plt */
694 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
695 };
696 \f
697
698 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
699 for the PLTResolve stub and then for each PLT entry. */
700 #define PLTRESOLVE_RELOCS_SHLIB 0
701 #define PLTRESOLVE_RELOCS 2
702 #define PLT_NON_JUMP_SLOT_RELOCS 2
703
704 /* Architecture-specific backend data for i386. */
705
706 struct elf_i386_backend_data
707 {
708 /* Parameters describing PLT generation. */
709 const struct elf_i386_plt_layout *plt;
710
711 /* Value used to fill the unused bytes of the first PLT entry. */
712 bfd_byte plt0_pad_byte;
713
714 /* True if the target system is VxWorks. */
715 int is_vxworks;
716 };
717
718 #define get_elf_i386_backend_data(abfd) \
719 ((const struct elf_i386_backend_data *) \
720 get_elf_backend_data (abfd)->arch_data)
721
722 /* These are the standard parameters. */
723 static const struct elf_i386_backend_data elf_i386_arch_bed =
724 {
725 &elf_i386_plt, /* plt */
726 0, /* plt0_pad_byte */
727 0, /* is_vxworks */
728 };
729
730 #define elf_backend_arch_data &elf_i386_arch_bed
731
732 /* i386 ELF linker hash entry. */
733
734 struct elf_i386_link_hash_entry
735 {
736 struct elf_link_hash_entry elf;
737
738 /* Track dynamic relocs copied for this symbol. */
739 struct elf_dyn_relocs *dyn_relocs;
740
741 #define GOT_UNKNOWN 0
742 #define GOT_NORMAL 1
743 #define GOT_TLS_GD 2
744 #define GOT_TLS_IE 4
745 #define GOT_TLS_IE_POS 5
746 #define GOT_TLS_IE_NEG 6
747 #define GOT_TLS_IE_BOTH 7
748 #define GOT_TLS_GDESC 8
749 #define GOT_TLS_GD_BOTH_P(type) \
750 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
751 #define GOT_TLS_GD_P(type) \
752 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
753 #define GOT_TLS_GDESC_P(type) \
754 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
755 #define GOT_TLS_GD_ANY_P(type) \
756 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
757 unsigned char tls_type;
758
759 /* Symbol is referenced by R_386_GOTOFF relocation. */
760 unsigned int gotoff_ref : 1;
761
762 /* Information about the GOT PLT entry. Filled when there are both
763 GOT and PLT relocations against the same function. */
764 union gotplt_union plt_got;
765
766 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
767 starting at the end of the jump table. */
768 bfd_vma tlsdesc_got;
769 };
770
771 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
772
773 struct elf_i386_obj_tdata
774 {
775 struct elf_obj_tdata root;
776
777 /* tls_type for each local got entry. */
778 char *local_got_tls_type;
779
780 /* GOTPLT entries for TLS descriptors. */
781 bfd_vma *local_tlsdesc_gotent;
782 };
783
784 #define elf_i386_tdata(abfd) \
785 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
786
787 #define elf_i386_local_got_tls_type(abfd) \
788 (elf_i386_tdata (abfd)->local_got_tls_type)
789
790 #define elf_i386_local_tlsdesc_gotent(abfd) \
791 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
792
793 #define is_i386_elf(bfd) \
794 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
795 && elf_tdata (bfd) != NULL \
796 && elf_object_id (bfd) == I386_ELF_DATA)
797
798 static bfd_boolean
799 elf_i386_mkobject (bfd *abfd)
800 {
801 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
802 I386_ELF_DATA);
803 }
804
805 /* i386 ELF linker hash table. */
806
807 struct elf_i386_link_hash_table
808 {
809 struct elf_link_hash_table elf;
810
811 /* Short-cuts to get to dynamic linker sections. */
812 asection *sdynbss;
813 asection *srelbss;
814 asection *plt_eh_frame;
815 asection *plt_got;
816
817 union
818 {
819 bfd_signed_vma refcount;
820 bfd_vma offset;
821 } tls_ldm_got;
822
823 /* The amount of space used by the reserved portion of the sgotplt
824 section, plus whatever space is used by the jump slots. */
825 bfd_vma sgotplt_jump_table_size;
826
827 /* Small local sym cache. */
828 struct sym_cache sym_cache;
829
830 /* _TLS_MODULE_BASE_ symbol. */
831 struct bfd_link_hash_entry *tls_module_base;
832
833 /* Used by local STT_GNU_IFUNC symbols. */
834 htab_t loc_hash_table;
835 void * loc_hash_memory;
836
837 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
838 asection *srelplt2;
839
840 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
841 bfd_vma next_tls_desc_index;
842
843 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
844 bfd_vma next_jump_slot_index;
845
846 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
847 bfd_vma next_irelative_index;
848 };
849
850 /* Get the i386 ELF linker hash table from a link_info structure. */
851
852 #define elf_i386_hash_table(p) \
853 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
854 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
855
856 #define elf_i386_compute_jump_table_size(htab) \
857 ((htab)->elf.srelplt->reloc_count * 4)
858
859 /* Create an entry in an i386 ELF linker hash table. */
860
861 static struct bfd_hash_entry *
862 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
863 struct bfd_hash_table *table,
864 const char *string)
865 {
866 /* Allocate the structure if it has not already been allocated by a
867 subclass. */
868 if (entry == NULL)
869 {
870 entry = (struct bfd_hash_entry *)
871 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
872 if (entry == NULL)
873 return entry;
874 }
875
876 /* Call the allocation method of the superclass. */
877 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
878 if (entry != NULL)
879 {
880 struct elf_i386_link_hash_entry *eh;
881
882 eh = (struct elf_i386_link_hash_entry *) entry;
883 eh->dyn_relocs = NULL;
884 eh->tls_type = GOT_UNKNOWN;
885 eh->gotoff_ref = 0;
886 eh->plt_got.offset = (bfd_vma) -1;
887 eh->tlsdesc_got = (bfd_vma) -1;
888 }
889
890 return entry;
891 }
892
893 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
894 for local symbol so that we can handle local STT_GNU_IFUNC symbols
895 as global symbol. We reuse indx and dynstr_index for local symbol
896 hash since they aren't used by global symbols in this backend. */
897
898 static hashval_t
899 elf_i386_local_htab_hash (const void *ptr)
900 {
901 struct elf_link_hash_entry *h
902 = (struct elf_link_hash_entry *) ptr;
903 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
904 }
905
906 /* Compare local hash entries. */
907
908 static int
909 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
910 {
911 struct elf_link_hash_entry *h1
912 = (struct elf_link_hash_entry *) ptr1;
913 struct elf_link_hash_entry *h2
914 = (struct elf_link_hash_entry *) ptr2;
915
916 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
917 }
918
919 /* Find and/or create a hash entry for local symbol. */
920
921 static struct elf_link_hash_entry *
922 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
923 bfd *abfd, const Elf_Internal_Rela *rel,
924 bfd_boolean create)
925 {
926 struct elf_i386_link_hash_entry e, *ret;
927 asection *sec = abfd->sections;
928 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
929 ELF32_R_SYM (rel->r_info));
930 void **slot;
931
932 e.elf.indx = sec->id;
933 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
934 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
935 create ? INSERT : NO_INSERT);
936
937 if (!slot)
938 return NULL;
939
940 if (*slot)
941 {
942 ret = (struct elf_i386_link_hash_entry *) *slot;
943 return &ret->elf;
944 }
945
946 ret = (struct elf_i386_link_hash_entry *)
947 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
948 sizeof (struct elf_i386_link_hash_entry));
949 if (ret)
950 {
951 memset (ret, 0, sizeof (*ret));
952 ret->elf.indx = sec->id;
953 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
954 ret->elf.dynindx = -1;
955 ret->plt_got.offset = (bfd_vma) -1;
956 *slot = ret;
957 }
958 return &ret->elf;
959 }
960
961 /* Destroy an i386 ELF linker hash table. */
962
963 static void
964 elf_i386_link_hash_table_free (bfd *obfd)
965 {
966 struct elf_i386_link_hash_table *htab
967 = (struct elf_i386_link_hash_table *) obfd->link.hash;
968
969 if (htab->loc_hash_table)
970 htab_delete (htab->loc_hash_table);
971 if (htab->loc_hash_memory)
972 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
973 _bfd_elf_link_hash_table_free (obfd);
974 }
975
976 /* Create an i386 ELF linker hash table. */
977
978 static struct bfd_link_hash_table *
979 elf_i386_link_hash_table_create (bfd *abfd)
980 {
981 struct elf_i386_link_hash_table *ret;
982 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
983
984 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
985 if (ret == NULL)
986 return NULL;
987
988 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
989 elf_i386_link_hash_newfunc,
990 sizeof (struct elf_i386_link_hash_entry),
991 I386_ELF_DATA))
992 {
993 free (ret);
994 return NULL;
995 }
996
997 ret->loc_hash_table = htab_try_create (1024,
998 elf_i386_local_htab_hash,
999 elf_i386_local_htab_eq,
1000 NULL);
1001 ret->loc_hash_memory = objalloc_create ();
1002 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1003 {
1004 elf_i386_link_hash_table_free (abfd);
1005 return NULL;
1006 }
1007 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1008
1009 return &ret->elf.root;
1010 }
1011
1012 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1013 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1014 hash table. */
1015
1016 static bfd_boolean
1017 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1018 {
1019 struct elf_i386_link_hash_table *htab;
1020
1021 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1022 return FALSE;
1023
1024 htab = elf_i386_hash_table (info);
1025 if (htab == NULL)
1026 return FALSE;
1027
1028 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1029 if (!htab->sdynbss)
1030 abort ();
1031
1032 if (info->executable)
1033 {
1034 /* Always allow copy relocs for building executables. */
1035 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1036 if (s == NULL)
1037 {
1038 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1039 s = bfd_make_section_anyway_with_flags (dynobj,
1040 ".rel.bss",
1041 (bed->dynamic_sec_flags
1042 | SEC_READONLY));
1043 if (s == NULL
1044 || ! bfd_set_section_alignment (dynobj, s,
1045 bed->s->log_file_align))
1046 return FALSE;
1047 }
1048 htab->srelbss = s;
1049 }
1050
1051 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1052 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1053 &htab->srelplt2))
1054 return FALSE;
1055
1056 if (!info->no_ld_generated_unwind_info
1057 && htab->plt_eh_frame == NULL
1058 && htab->elf.splt != NULL)
1059 {
1060 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1061 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED);
1063 htab->plt_eh_frame
1064 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1065 if (htab->plt_eh_frame == NULL
1066 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1067 return FALSE;
1068 }
1069
1070 return TRUE;
1071 }
1072
1073 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1074
1075 static void
1076 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1077 struct elf_link_hash_entry *dir,
1078 struct elf_link_hash_entry *ind)
1079 {
1080 struct elf_i386_link_hash_entry *edir, *eind;
1081
1082 edir = (struct elf_i386_link_hash_entry *) dir;
1083 eind = (struct elf_i386_link_hash_entry *) ind;
1084
1085 if (eind->dyn_relocs != NULL)
1086 {
1087 if (edir->dyn_relocs != NULL)
1088 {
1089 struct elf_dyn_relocs **pp;
1090 struct elf_dyn_relocs *p;
1091
1092 /* Add reloc counts against the indirect sym to the direct sym
1093 list. Merge any entries against the same section. */
1094 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1095 {
1096 struct elf_dyn_relocs *q;
1097
1098 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1099 if (q->sec == p->sec)
1100 {
1101 q->pc_count += p->pc_count;
1102 q->count += p->count;
1103 *pp = p->next;
1104 break;
1105 }
1106 if (q == NULL)
1107 pp = &p->next;
1108 }
1109 *pp = edir->dyn_relocs;
1110 }
1111
1112 edir->dyn_relocs = eind->dyn_relocs;
1113 eind->dyn_relocs = NULL;
1114 }
1115
1116 if (ind->root.type == bfd_link_hash_indirect
1117 && dir->got.refcount <= 0)
1118 {
1119 edir->tls_type = eind->tls_type;
1120 eind->tls_type = GOT_UNKNOWN;
1121 }
1122
1123 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1124 generate a R_386_COPY reloc. */
1125 edir->gotoff_ref |= eind->gotoff_ref;
1126
1127 if (ELIMINATE_COPY_RELOCS
1128 && ind->root.type != bfd_link_hash_indirect
1129 && dir->dynamic_adjusted)
1130 {
1131 /* If called to transfer flags for a weakdef during processing
1132 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1133 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1134 dir->ref_dynamic |= ind->ref_dynamic;
1135 dir->ref_regular |= ind->ref_regular;
1136 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1137 dir->needs_plt |= ind->needs_plt;
1138 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1139 }
1140 else
1141 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1142 }
1143
1144 /* Return TRUE if the TLS access code sequence support transition
1145 from R_TYPE. */
1146
1147 static bfd_boolean
1148 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1149 bfd_byte *contents,
1150 Elf_Internal_Shdr *symtab_hdr,
1151 struct elf_link_hash_entry **sym_hashes,
1152 unsigned int r_type,
1153 const Elf_Internal_Rela *rel,
1154 const Elf_Internal_Rela *relend)
1155 {
1156 unsigned int val, type;
1157 unsigned long r_symndx;
1158 struct elf_link_hash_entry *h;
1159 bfd_vma offset;
1160
1161 /* Get the section contents. */
1162 if (contents == NULL)
1163 {
1164 if (elf_section_data (sec)->this_hdr.contents != NULL)
1165 contents = elf_section_data (sec)->this_hdr.contents;
1166 else
1167 {
1168 /* FIXME: How to better handle error condition? */
1169 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1170 return FALSE;
1171
1172 /* Cache the section contents for elf_link_input_bfd. */
1173 elf_section_data (sec)->this_hdr.contents = contents;
1174 }
1175 }
1176
1177 offset = rel->r_offset;
1178 switch (r_type)
1179 {
1180 case R_386_TLS_GD:
1181 case R_386_TLS_LDM:
1182 if (offset < 2 || (rel + 1) >= relend)
1183 return FALSE;
1184
1185 type = bfd_get_8 (abfd, contents + offset - 2);
1186 if (r_type == R_386_TLS_GD)
1187 {
1188 /* Check transition from GD access model. Only
1189 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1190 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1191 can transit to different access model. */
1192 if ((offset + 10) > sec->size ||
1193 (type != 0x8d && type != 0x04))
1194 return FALSE;
1195
1196 val = bfd_get_8 (abfd, contents + offset - 1);
1197 if (type == 0x04)
1198 {
1199 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1200 if (offset < 3)
1201 return FALSE;
1202
1203 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1204 return FALSE;
1205
1206 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1207 return FALSE;
1208 }
1209 else
1210 {
1211 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1212 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1213 return FALSE;
1214
1215 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1216 return FALSE;
1217 }
1218 }
1219 else
1220 {
1221 /* Check transition from LD access model. Only
1222 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1223 can transit to different access model. */
1224 if (type != 0x8d || (offset + 9) > sec->size)
1225 return FALSE;
1226
1227 val = bfd_get_8 (abfd, contents + offset - 1);
1228 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1229 return FALSE;
1230 }
1231
1232 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1233 return FALSE;
1234
1235 r_symndx = ELF32_R_SYM (rel[1].r_info);
1236 if (r_symndx < symtab_hdr->sh_info)
1237 return FALSE;
1238
1239 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1240 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1241 may be versioned. */
1242 return (h != NULL
1243 && h->root.root.string != NULL
1244 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1245 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1246 && (strncmp (h->root.root.string, "___tls_get_addr",
1247 15) == 0));
1248
1249 case R_386_TLS_IE:
1250 /* Check transition from IE access model:
1251 movl foo@indntpoff(%rip), %eax
1252 movl foo@indntpoff(%rip), %reg
1253 addl foo@indntpoff(%rip), %reg
1254 */
1255
1256 if (offset < 1 || (offset + 4) > sec->size)
1257 return FALSE;
1258
1259 /* Check "movl foo@tpoff(%rip), %eax" first. */
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1261 if (val == 0xa1)
1262 return TRUE;
1263
1264 if (offset < 2)
1265 return FALSE;
1266
1267 /* Check movl|addl foo@tpoff(%rip), %reg. */
1268 type = bfd_get_8 (abfd, contents + offset - 2);
1269 return ((type == 0x8b || type == 0x03)
1270 && (val & 0xc7) == 0x05);
1271
1272 case R_386_TLS_GOTIE:
1273 case R_386_TLS_IE_32:
1274 /* Check transition from {IE_32,GOTIE} access model:
1275 subl foo@{tpoff,gontoff}(%reg1), %reg2
1276 movl foo@{tpoff,gontoff}(%reg1), %reg2
1277 addl foo@{tpoff,gontoff}(%reg1), %reg2
1278 */
1279
1280 if (offset < 2 || (offset + 4) > sec->size)
1281 return FALSE;
1282
1283 val = bfd_get_8 (abfd, contents + offset - 1);
1284 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1285 return FALSE;
1286
1287 type = bfd_get_8 (abfd, contents + offset - 2);
1288 return type == 0x8b || type == 0x2b || type == 0x03;
1289
1290 case R_386_TLS_GOTDESC:
1291 /* Check transition from GDesc access model:
1292 leal x@tlsdesc(%ebx), %eax
1293
1294 Make sure it's a leal adding ebx to a 32-bit offset
1295 into any register, although it's probably almost always
1296 going to be eax. */
1297
1298 if (offset < 2 || (offset + 4) > sec->size)
1299 return FALSE;
1300
1301 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1302 return FALSE;
1303
1304 val = bfd_get_8 (abfd, contents + offset - 1);
1305 return (val & 0xc7) == 0x83;
1306
1307 case R_386_TLS_DESC_CALL:
1308 /* Check transition from GDesc access model:
1309 call *x@tlsdesc(%rax)
1310 */
1311 if (offset + 2 <= sec->size)
1312 {
1313 /* Make sure that it's a call *x@tlsdesc(%rax). */
1314 static const unsigned char call[] = { 0xff, 0x10 };
1315 return memcmp (contents + offset, call, 2) == 0;
1316 }
1317
1318 return FALSE;
1319
1320 default:
1321 abort ();
1322 }
1323 }
1324
1325 /* Return TRUE if the TLS access transition is OK or no transition
1326 will be performed. Update R_TYPE if there is a transition. */
1327
1328 static bfd_boolean
1329 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1330 asection *sec, bfd_byte *contents,
1331 Elf_Internal_Shdr *symtab_hdr,
1332 struct elf_link_hash_entry **sym_hashes,
1333 unsigned int *r_type, int tls_type,
1334 const Elf_Internal_Rela *rel,
1335 const Elf_Internal_Rela *relend,
1336 struct elf_link_hash_entry *h,
1337 unsigned long r_symndx)
1338 {
1339 unsigned int from_type = *r_type;
1340 unsigned int to_type = from_type;
1341 bfd_boolean check = TRUE;
1342
1343 /* Skip TLS transition for functions. */
1344 if (h != NULL
1345 && (h->type == STT_FUNC
1346 || h->type == STT_GNU_IFUNC))
1347 return TRUE;
1348
1349 switch (from_type)
1350 {
1351 case R_386_TLS_GD:
1352 case R_386_TLS_GOTDESC:
1353 case R_386_TLS_DESC_CALL:
1354 case R_386_TLS_IE_32:
1355 case R_386_TLS_IE:
1356 case R_386_TLS_GOTIE:
1357 if (info->executable)
1358 {
1359 if (h == NULL)
1360 to_type = R_386_TLS_LE_32;
1361 else if (from_type != R_386_TLS_IE
1362 && from_type != R_386_TLS_GOTIE)
1363 to_type = R_386_TLS_IE_32;
1364 }
1365
1366 /* When we are called from elf_i386_relocate_section, CONTENTS
1367 isn't NULL and there may be additional transitions based on
1368 TLS_TYPE. */
1369 if (contents != NULL)
1370 {
1371 unsigned int new_to_type = to_type;
1372
1373 if (info->executable
1374 && h != NULL
1375 && h->dynindx == -1
1376 && (tls_type & GOT_TLS_IE))
1377 new_to_type = R_386_TLS_LE_32;
1378
1379 if (to_type == R_386_TLS_GD
1380 || to_type == R_386_TLS_GOTDESC
1381 || to_type == R_386_TLS_DESC_CALL)
1382 {
1383 if (tls_type == GOT_TLS_IE_POS)
1384 new_to_type = R_386_TLS_GOTIE;
1385 else if (tls_type & GOT_TLS_IE)
1386 new_to_type = R_386_TLS_IE_32;
1387 }
1388
1389 /* We checked the transition before when we were called from
1390 elf_i386_check_relocs. We only want to check the new
1391 transition which hasn't been checked before. */
1392 check = new_to_type != to_type && from_type == to_type;
1393 to_type = new_to_type;
1394 }
1395
1396 break;
1397
1398 case R_386_TLS_LDM:
1399 if (info->executable)
1400 to_type = R_386_TLS_LE_32;
1401 break;
1402
1403 default:
1404 return TRUE;
1405 }
1406
1407 /* Return TRUE if there is no transition. */
1408 if (from_type == to_type)
1409 return TRUE;
1410
1411 /* Check if the transition can be performed. */
1412 if (check
1413 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1414 symtab_hdr, sym_hashes,
1415 from_type, rel, relend))
1416 {
1417 reloc_howto_type *from, *to;
1418 const char *name;
1419
1420 from = elf_i386_rtype_to_howto (abfd, from_type);
1421 to = elf_i386_rtype_to_howto (abfd, to_type);
1422
1423 if (h)
1424 name = h->root.root.string;
1425 else
1426 {
1427 struct elf_i386_link_hash_table *htab;
1428
1429 htab = elf_i386_hash_table (info);
1430 if (htab == NULL)
1431 name = "*unknown*";
1432 else
1433 {
1434 Elf_Internal_Sym *isym;
1435
1436 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1437 abfd, r_symndx);
1438 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1439 }
1440 }
1441
1442 (*_bfd_error_handler)
1443 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1444 "in section `%A' failed"),
1445 abfd, sec, from->name, to->name, name,
1446 (unsigned long) rel->r_offset);
1447 bfd_set_error (bfd_error_bad_value);
1448 return FALSE;
1449 }
1450
1451 *r_type = to_type;
1452 return TRUE;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define need_convert_mov_to_lea sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bfd_boolean
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_i386_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_boolean use_plt_got;
1476
1477 if (info->relocatable)
1478 return TRUE;
1479
1480 BFD_ASSERT (is_i386_elf (abfd));
1481
1482 htab = elf_i386_hash_table (info);
1483 if (htab == NULL)
1484 return FALSE;
1485
1486 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1487 && (get_elf_i386_backend_data (abfd)
1488 == &elf_i386_arch_bed));
1489
1490 symtab_hdr = &elf_symtab_hdr (abfd);
1491 sym_hashes = elf_sym_hashes (abfd);
1492
1493 sreloc = NULL;
1494
1495 rel_end = relocs + sec->reloc_count;
1496 for (rel = relocs; rel < rel_end; rel++)
1497 {
1498 unsigned int r_type;
1499 unsigned long r_symndx;
1500 struct elf_link_hash_entry *h;
1501 struct elf_i386_link_hash_entry *eh;
1502 Elf_Internal_Sym *isym;
1503 const char *name;
1504 bfd_boolean size_reloc;
1505
1506 r_symndx = ELF32_R_SYM (rel->r_info);
1507 r_type = ELF32_R_TYPE (rel->r_info);
1508
1509 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1510 {
1511 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1512 abfd,
1513 r_symndx);
1514 return FALSE;
1515 }
1516
1517 if (r_symndx < symtab_hdr->sh_info)
1518 {
1519 /* A local symbol. */
1520 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1521 abfd, r_symndx);
1522 if (isym == NULL)
1523 return FALSE;
1524
1525 /* Check relocation against local STT_GNU_IFUNC symbol. */
1526 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1527 {
1528 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1529 if (h == NULL)
1530 return FALSE;
1531
1532 /* Fake a STT_GNU_IFUNC symbol. */
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_i386_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 /* Create the ifunc sections for static executables. If we
1555 never see an indirect function symbol nor we are building
1556 a static executable, those sections will be empty and
1557 won't appear in output. */
1558 switch (r_type)
1559 {
1560 default:
1561 break;
1562
1563 case R_386_GOTOFF:
1564 eh->gotoff_ref = 1;
1565 case R_386_32:
1566 case R_386_PC32:
1567 case R_386_PLT32:
1568 case R_386_GOT32:
1569 if (htab->elf.dynobj == NULL)
1570 htab->elf.dynobj = abfd;
1571 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1572 return FALSE;
1573 break;
1574 }
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 h->root.non_ir_ref = 1;
1579 }
1580
1581 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1582 symtab_hdr, sym_hashes,
1583 &r_type, GOT_UNKNOWN,
1584 rel, rel_end, h, r_symndx))
1585 return FALSE;
1586
1587 switch (r_type)
1588 {
1589 case R_386_TLS_LDM:
1590 htab->tls_ldm_got.refcount += 1;
1591 goto create_got;
1592
1593 case R_386_PLT32:
1594 /* This symbol requires a procedure linkage table entry. We
1595 actually build the entry in adjust_dynamic_symbol,
1596 because this might be a case of linking PIC code which is
1597 never referenced by a dynamic object, in which case we
1598 don't need to generate a procedure linkage table entry
1599 after all. */
1600
1601 /* If this is a local symbol, we resolve it directly without
1602 creating a procedure linkage table entry. */
1603 if (h == NULL)
1604 continue;
1605
1606 h->needs_plt = 1;
1607 h->plt.refcount += 1;
1608 break;
1609
1610 case R_386_SIZE32:
1611 size_reloc = TRUE;
1612 goto do_size;
1613
1614 case R_386_TLS_IE_32:
1615 case R_386_TLS_IE:
1616 case R_386_TLS_GOTIE:
1617 if (!info->executable)
1618 info->flags |= DF_STATIC_TLS;
1619 /* Fall through */
1620
1621 case R_386_GOT32:
1622 case R_386_TLS_GD:
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1626 {
1627 int tls_type, old_tls_type;
1628
1629 switch (r_type)
1630 {
1631 default:
1632 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1640 else
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1644 break;
1645 case R_386_TLS_IE:
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1648 }
1649
1650 if (h != NULL)
1651 {
1652 h->got.refcount += 1;
1653 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1654 }
1655 else
1656 {
1657 bfd_signed_vma *local_got_refcounts;
1658
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1662 {
1663 bfd_size_type size;
1664
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1671 return FALSE;
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_i386_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_i386_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1677 }
1678 local_got_refcounts[r_symndx] += 1;
1679 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1680 }
1681
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1689 {
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1695 else
1696 {
1697 if (h)
1698 name = h->root.root.string;
1699 else
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1701 NULL);
1702 (*_bfd_error_handler)
1703 (_("%B: `%s' accessed both as normal and "
1704 "thread local symbol"),
1705 abfd, name);
1706 bfd_set_error (bfd_error_bad_value);
1707 return FALSE;
1708 }
1709 }
1710
1711 if (old_tls_type != tls_type)
1712 {
1713 if (h != NULL)
1714 elf_i386_hash_entry (h)->tls_type = tls_type;
1715 else
1716 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1717 }
1718 }
1719 /* Fall through */
1720
1721 case R_386_GOTOFF:
1722 case R_386_GOTPC:
1723 create_got:
1724 if (htab->elf.sgot == NULL)
1725 {
1726 if (htab->elf.dynobj == NULL)
1727 htab->elf.dynobj = abfd;
1728 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1729 return FALSE;
1730 }
1731 if (r_type != R_386_TLS_IE)
1732 break;
1733 /* Fall through */
1734
1735 case R_386_TLS_LE_32:
1736 case R_386_TLS_LE:
1737 if (info->executable)
1738 break;
1739 info->flags |= DF_STATIC_TLS;
1740 /* Fall through */
1741
1742 case R_386_32:
1743 case R_386_PC32:
1744 if (h != NULL && info->executable)
1745 {
1746 /* If this reloc is in a read-only section, we might
1747 need a copy reloc. We can't check reliably at this
1748 stage whether the section is read-only, as input
1749 sections have not yet been mapped to output sections.
1750 Tentatively set the flag for now, and correct in
1751 adjust_dynamic_symbol. */
1752 h->non_got_ref = 1;
1753
1754 /* We may need a .plt entry if the function this reloc
1755 refers to is in a shared lib. */
1756 h->plt.refcount += 1;
1757 if (r_type != R_386_PC32)
1758 h->pointer_equality_needed = 1;
1759 }
1760
1761 size_reloc = FALSE;
1762 do_size:
1763 /* If we are creating a shared library, and this is a reloc
1764 against a global symbol, or a non PC relative reloc
1765 against a local symbol, then we need to copy the reloc
1766 into the shared library. However, if we are linking with
1767 -Bsymbolic, we do not need to copy a reloc against a
1768 global symbol which is defined in an object we are
1769 including in the link (i.e., DEF_REGULAR is set). At
1770 this point we have not seen all the input files, so it is
1771 possible that DEF_REGULAR is not set now but will be set
1772 later (it is never cleared). In case of a weak definition,
1773 DEF_REGULAR may be cleared later by a strong definition in
1774 a shared library. We account for that possibility below by
1775 storing information in the relocs_copied field of the hash
1776 table entry. A similar situation occurs when creating
1777 shared libraries and symbol visibility changes render the
1778 symbol local.
1779
1780 If on the other hand, we are creating an executable, we
1781 may need to keep relocations for symbols satisfied by a
1782 dynamic library if we manage to avoid copy relocs for the
1783 symbol. */
1784 if ((info->shared
1785 && (sec->flags & SEC_ALLOC) != 0
1786 && (r_type != R_386_PC32
1787 || (h != NULL
1788 && (! SYMBOLIC_BIND (info, h)
1789 || h->root.type == bfd_link_hash_defweak
1790 || !h->def_regular))))
1791 || (ELIMINATE_COPY_RELOCS
1792 && !info->shared
1793 && (sec->flags & SEC_ALLOC) != 0
1794 && h != NULL
1795 && (h->root.type == bfd_link_hash_defweak
1796 || !h->def_regular)))
1797 {
1798 struct elf_dyn_relocs *p;
1799 struct elf_dyn_relocs **head;
1800
1801 /* We must copy these reloc types into the output file.
1802 Create a reloc section in dynobj and make room for
1803 this reloc. */
1804 if (sreloc == NULL)
1805 {
1806 if (htab->elf.dynobj == NULL)
1807 htab->elf.dynobj = abfd;
1808
1809 sreloc = _bfd_elf_make_dynamic_reloc_section
1810 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1811
1812 if (sreloc == NULL)
1813 return FALSE;
1814 }
1815
1816 /* If this is a global symbol, we count the number of
1817 relocations we need for this symbol. */
1818 if (h != NULL)
1819 {
1820 head = &eh->dyn_relocs;
1821 }
1822 else
1823 {
1824 /* Track dynamic relocs needed for local syms too.
1825 We really need local syms available to do this
1826 easily. Oh well. */
1827 void **vpp;
1828 asection *s;
1829
1830 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1831 abfd, r_symndx);
1832 if (isym == NULL)
1833 return FALSE;
1834
1835 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1836 if (s == NULL)
1837 s = sec;
1838
1839 vpp = &elf_section_data (s)->local_dynrel;
1840 head = (struct elf_dyn_relocs **)vpp;
1841 }
1842
1843 p = *head;
1844 if (p == NULL || p->sec != sec)
1845 {
1846 bfd_size_type amt = sizeof *p;
1847 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1848 amt);
1849 if (p == NULL)
1850 return FALSE;
1851 p->next = *head;
1852 *head = p;
1853 p->sec = sec;
1854 p->count = 0;
1855 p->pc_count = 0;
1856 }
1857
1858 p->count += 1;
1859 /* Count size relocation as PC-relative relocation. */
1860 if (r_type == R_386_PC32 || size_reloc)
1861 p->pc_count += 1;
1862 }
1863 break;
1864
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1869 return FALSE;
1870 break;
1871
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1876 if (h != NULL
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1878 return FALSE;
1879 break;
1880
1881 default:
1882 break;
1883 }
1884
1885 if (use_plt_got
1886 && h != NULL
1887 && h->plt.refcount > 0
1888 && 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 (abfd, contents + irel->r_offset - 2) == 0x8b)
2728 {
2729 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2730 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2731 if (local_got_refcounts != NULL
2732 && local_got_refcounts[r_symndx] > 0)
2733 local_got_refcounts[r_symndx] -= 1;
2734 changed_contents = TRUE;
2735 changed_relocs = TRUE;
2736 }
2737 continue;
2738 }
2739
2740 indx = r_symndx - symtab_hdr->sh_info;
2741 h = elf_sym_hashes (abfd)[indx];
2742 BFD_ASSERT (h != NULL);
2743
2744 while (h->root.type == bfd_link_hash_indirect
2745 || h->root.type == bfd_link_hash_warning)
2746 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2747
2748 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2749 optimizing _DYNAMIC since ld.so may use its link-time address. */
2750 if (h->def_regular
2751 && h->type != STT_GNU_IFUNC
2752 && h != htab->elf.hdynamic
2753 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2754 && irel->r_offset >= 2
2755 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2756 {
2757 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2758 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2759 if (h->got.refcount > 0)
2760 h->got.refcount -= 1;
2761 changed_contents = TRUE;
2762 changed_relocs = TRUE;
2763 }
2764 }
2765
2766 if (contents != NULL
2767 && elf_section_data (sec)->this_hdr.contents != contents)
2768 {
2769 if (!changed_contents && !link_info->keep_memory)
2770 free (contents);
2771 else
2772 {
2773 /* Cache the section contents for elf_link_input_bfd. */
2774 elf_section_data (sec)->this_hdr.contents = contents;
2775 }
2776 }
2777
2778 if (elf_section_data (sec)->relocs != internal_relocs)
2779 {
2780 if (!changed_relocs)
2781 free (internal_relocs);
2782 else
2783 elf_section_data (sec)->relocs = internal_relocs;
2784 }
2785
2786 return TRUE;
2787
2788 error_return:
2789 if (contents != NULL
2790 && elf_section_data (sec)->this_hdr.contents != contents)
2791 free (contents);
2792 if (internal_relocs != NULL
2793 && elf_section_data (sec)->relocs != internal_relocs)
2794 free (internal_relocs);
2795 return FALSE;
2796 }
2797
2798 /* Set the sizes of the dynamic sections. */
2799
2800 static bfd_boolean
2801 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2802 {
2803 struct elf_i386_link_hash_table *htab;
2804 bfd *dynobj;
2805 asection *s;
2806 bfd_boolean relocs;
2807 bfd *ibfd;
2808
2809 htab = elf_i386_hash_table (info);
2810 if (htab == NULL)
2811 return FALSE;
2812 dynobj = htab->elf.dynobj;
2813 if (dynobj == NULL)
2814 abort ();
2815
2816 if (htab->elf.dynamic_sections_created)
2817 {
2818 /* Set the contents of the .interp section to the interpreter. */
2819 if (info->executable)
2820 {
2821 s = bfd_get_linker_section (dynobj, ".interp");
2822 if (s == NULL)
2823 abort ();
2824 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2825 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2826 }
2827 }
2828
2829 /* Set up .got offsets for local syms, and space for local dynamic
2830 relocs. */
2831 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2832 {
2833 bfd_signed_vma *local_got;
2834 bfd_signed_vma *end_local_got;
2835 char *local_tls_type;
2836 bfd_vma *local_tlsdesc_gotent;
2837 bfd_size_type locsymcount;
2838 Elf_Internal_Shdr *symtab_hdr;
2839 asection *srel;
2840
2841 if (! is_i386_elf (ibfd))
2842 continue;
2843
2844 for (s = ibfd->sections; s != NULL; s = s->next)
2845 {
2846 struct elf_dyn_relocs *p;
2847
2848 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2849 return FALSE;
2850
2851 for (p = ((struct elf_dyn_relocs *)
2852 elf_section_data (s)->local_dynrel);
2853 p != NULL;
2854 p = p->next)
2855 {
2856 if (!bfd_is_abs_section (p->sec)
2857 && bfd_is_abs_section (p->sec->output_section))
2858 {
2859 /* Input section has been discarded, either because
2860 it is a copy of a linkonce section or due to
2861 linker script /DISCARD/, so we'll be discarding
2862 the relocs too. */
2863 }
2864 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2865 && strcmp (p->sec->output_section->name,
2866 ".tls_vars") == 0)
2867 {
2868 /* Relocations in vxworks .tls_vars sections are
2869 handled specially by the loader. */
2870 }
2871 else if (p->count != 0)
2872 {
2873 srel = elf_section_data (p->sec)->sreloc;
2874 srel->size += p->count * sizeof (Elf32_External_Rel);
2875 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2876 && (info->flags & DF_TEXTREL) == 0)
2877 {
2878 info->flags |= DF_TEXTREL;
2879 if ((info->warn_shared_textrel && info->shared)
2880 || info->error_textrel)
2881 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2882 p->sec->owner, p->sec);
2883 }
2884 }
2885 }
2886 }
2887
2888 local_got = elf_local_got_refcounts (ibfd);
2889 if (!local_got)
2890 continue;
2891
2892 symtab_hdr = &elf_symtab_hdr (ibfd);
2893 locsymcount = symtab_hdr->sh_info;
2894 end_local_got = local_got + locsymcount;
2895 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2896 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2897 s = htab->elf.sgot;
2898 srel = htab->elf.srelgot;
2899 for (; local_got < end_local_got;
2900 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2901 {
2902 *local_tlsdesc_gotent = (bfd_vma) -1;
2903 if (*local_got > 0)
2904 {
2905 if (GOT_TLS_GDESC_P (*local_tls_type))
2906 {
2907 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2908 - elf_i386_compute_jump_table_size (htab);
2909 htab->elf.sgotplt->size += 8;
2910 *local_got = (bfd_vma) -2;
2911 }
2912 if (! GOT_TLS_GDESC_P (*local_tls_type)
2913 || GOT_TLS_GD_P (*local_tls_type))
2914 {
2915 *local_got = s->size;
2916 s->size += 4;
2917 if (GOT_TLS_GD_P (*local_tls_type)
2918 || *local_tls_type == GOT_TLS_IE_BOTH)
2919 s->size += 4;
2920 }
2921 if (info->shared
2922 || GOT_TLS_GD_ANY_P (*local_tls_type)
2923 || (*local_tls_type & GOT_TLS_IE))
2924 {
2925 if (*local_tls_type == GOT_TLS_IE_BOTH)
2926 srel->size += 2 * sizeof (Elf32_External_Rel);
2927 else if (GOT_TLS_GD_P (*local_tls_type)
2928 || ! GOT_TLS_GDESC_P (*local_tls_type))
2929 srel->size += sizeof (Elf32_External_Rel);
2930 if (GOT_TLS_GDESC_P (*local_tls_type))
2931 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2932 }
2933 }
2934 else
2935 *local_got = (bfd_vma) -1;
2936 }
2937 }
2938
2939 if (htab->tls_ldm_got.refcount > 0)
2940 {
2941 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2942 relocs. */
2943 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2944 htab->elf.sgot->size += 8;
2945 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2946 }
2947 else
2948 htab->tls_ldm_got.offset = -1;
2949
2950 /* Allocate global sym .plt and .got entries, and space for global
2951 sym dynamic relocs. */
2952 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2953
2954 /* Allocate .plt and .got entries, and space for local symbols. */
2955 htab_traverse (htab->loc_hash_table,
2956 elf_i386_allocate_local_dynrelocs,
2957 info);
2958
2959 /* For every jump slot reserved in the sgotplt, reloc_count is
2960 incremented. However, when we reserve space for TLS descriptors,
2961 it's not incremented, so in order to compute the space reserved
2962 for them, it suffices to multiply the reloc count by the jump
2963 slot size.
2964
2965 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2966 so that R_386_IRELATIVE entries come last. */
2967 if (htab->elf.srelplt)
2968 {
2969 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2970 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2971 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2972 }
2973 else if (htab->elf.irelplt)
2974 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2975
2976
2977 if (htab->elf.sgotplt)
2978 {
2979 /* Don't allocate .got.plt section if there are no GOT nor PLT
2980 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2981 if ((htab->elf.hgot == NULL
2982 || !htab->elf.hgot->ref_regular_nonweak)
2983 && (htab->elf.sgotplt->size
2984 == get_elf_backend_data (output_bfd)->got_header_size)
2985 && (htab->elf.splt == NULL
2986 || htab->elf.splt->size == 0)
2987 && (htab->elf.sgot == NULL
2988 || htab->elf.sgot->size == 0)
2989 && (htab->elf.iplt == NULL
2990 || htab->elf.iplt->size == 0)
2991 && (htab->elf.igotplt == NULL
2992 || htab->elf.igotplt->size == 0))
2993 htab->elf.sgotplt->size = 0;
2994 }
2995
2996
2997 if (htab->plt_eh_frame != NULL
2998 && htab->elf.splt != NULL
2999 && htab->elf.splt->size != 0
3000 && !bfd_is_abs_section (htab->elf.splt->output_section)
3001 && _bfd_elf_eh_frame_present (info))
3002 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3003
3004 /* We now have determined the sizes of the various dynamic sections.
3005 Allocate memory for them. */
3006 relocs = FALSE;
3007 for (s = dynobj->sections; s != NULL; s = s->next)
3008 {
3009 bfd_boolean strip_section = TRUE;
3010
3011 if ((s->flags & SEC_LINKER_CREATED) == 0)
3012 continue;
3013
3014 if (s == htab->elf.splt
3015 || s == htab->elf.sgot)
3016 {
3017 /* Strip this section if we don't need it; see the
3018 comment below. */
3019 /* We'd like to strip these sections if they aren't needed, but if
3020 we've exported dynamic symbols from them we must leave them.
3021 It's too late to tell BFD to get rid of the symbols. */
3022
3023 if (htab->elf.hplt != NULL)
3024 strip_section = FALSE;
3025 }
3026 else if (s == htab->elf.sgotplt
3027 || s == htab->elf.iplt
3028 || s == htab->elf.igotplt
3029 || s == htab->plt_got
3030 || s == htab->plt_eh_frame
3031 || s == htab->sdynbss)
3032 {
3033 /* Strip these too. */
3034 }
3035 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3036 {
3037 if (s->size != 0
3038 && s != htab->elf.srelplt
3039 && s != htab->srelplt2)
3040 relocs = TRUE;
3041
3042 /* We use the reloc_count field as a counter if we need
3043 to copy relocs into the output file. */
3044 s->reloc_count = 0;
3045 }
3046 else
3047 {
3048 /* It's not one of our sections, so don't allocate space. */
3049 continue;
3050 }
3051
3052 if (s->size == 0)
3053 {
3054 /* If we don't need this section, strip it from the
3055 output file. This is mostly to handle .rel.bss and
3056 .rel.plt. We must create both sections in
3057 create_dynamic_sections, because they must be created
3058 before the linker maps input sections to output
3059 sections. The linker does that before
3060 adjust_dynamic_symbol is called, and it is that
3061 function which decides whether anything needs to go
3062 into these sections. */
3063 if (strip_section)
3064 s->flags |= SEC_EXCLUDE;
3065 continue;
3066 }
3067
3068 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3069 continue;
3070
3071 /* Allocate memory for the section contents. We use bfd_zalloc
3072 here in case unused entries are not reclaimed before the
3073 section's contents are written out. This should not happen,
3074 but this way if it does, we get a R_386_NONE reloc instead
3075 of garbage. */
3076 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3077 if (s->contents == NULL)
3078 return FALSE;
3079 }
3080
3081 if (htab->plt_eh_frame != NULL
3082 && htab->plt_eh_frame->contents != NULL)
3083 {
3084 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3085 sizeof (elf_i386_eh_frame_plt));
3086 bfd_put_32 (dynobj, htab->elf.splt->size,
3087 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3088 }
3089
3090 if (htab->elf.dynamic_sections_created)
3091 {
3092 /* Add some entries to the .dynamic section. We fill in the
3093 values later, in elf_i386_finish_dynamic_sections, but we
3094 must add the entries now so that we get the correct size for
3095 the .dynamic section. The DT_DEBUG entry is filled in by the
3096 dynamic linker and used by the debugger. */
3097 #define add_dynamic_entry(TAG, VAL) \
3098 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3099
3100 if (info->executable)
3101 {
3102 if (!add_dynamic_entry (DT_DEBUG, 0))
3103 return FALSE;
3104 }
3105
3106 if (htab->elf.splt->size != 0)
3107 {
3108 if (!add_dynamic_entry (DT_PLTGOT, 0)
3109 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3110 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3111 || !add_dynamic_entry (DT_JMPREL, 0))
3112 return FALSE;
3113 }
3114
3115 if (relocs)
3116 {
3117 if (!add_dynamic_entry (DT_REL, 0)
3118 || !add_dynamic_entry (DT_RELSZ, 0)
3119 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3120 return FALSE;
3121
3122 /* If any dynamic relocs apply to a read-only section,
3123 then we need a DT_TEXTREL entry. */
3124 if ((info->flags & DF_TEXTREL) == 0)
3125 elf_link_hash_traverse (&htab->elf,
3126 elf_i386_readonly_dynrelocs, info);
3127
3128 if ((info->flags & DF_TEXTREL) != 0)
3129 {
3130 if (!add_dynamic_entry (DT_TEXTREL, 0))
3131 return FALSE;
3132 }
3133 }
3134 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3135 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3136 return FALSE;
3137 }
3138 #undef add_dynamic_entry
3139
3140 return TRUE;
3141 }
3142
3143 static bfd_boolean
3144 elf_i386_always_size_sections (bfd *output_bfd,
3145 struct bfd_link_info *info)
3146 {
3147 asection *tls_sec = elf_hash_table (info)->tls_sec;
3148
3149 if (tls_sec)
3150 {
3151 struct elf_link_hash_entry *tlsbase;
3152
3153 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3154 "_TLS_MODULE_BASE_",
3155 FALSE, FALSE, FALSE);
3156
3157 if (tlsbase && tlsbase->type == STT_TLS)
3158 {
3159 struct elf_i386_link_hash_table *htab;
3160 struct bfd_link_hash_entry *bh = NULL;
3161 const struct elf_backend_data *bed
3162 = get_elf_backend_data (output_bfd);
3163
3164 htab = elf_i386_hash_table (info);
3165 if (htab == NULL)
3166 return FALSE;
3167
3168 if (!(_bfd_generic_link_add_one_symbol
3169 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3170 tls_sec, 0, NULL, FALSE,
3171 bed->collect, &bh)))
3172 return FALSE;
3173
3174 htab->tls_module_base = bh;
3175
3176 tlsbase = (struct elf_link_hash_entry *)bh;
3177 tlsbase->def_regular = 1;
3178 tlsbase->other = STV_HIDDEN;
3179 tlsbase->root.linker_def = 1;
3180 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3181 }
3182 }
3183
3184 return TRUE;
3185 }
3186
3187 /* Set the correct type for an x86 ELF section. We do this by the
3188 section name, which is a hack, but ought to work. */
3189
3190 static bfd_boolean
3191 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3192 Elf_Internal_Shdr *hdr,
3193 asection *sec)
3194 {
3195 const char *name;
3196
3197 name = bfd_get_section_name (abfd, sec);
3198
3199 /* This is an ugly, but unfortunately necessary hack that is
3200 needed when producing EFI binaries on x86. It tells
3201 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3202 containing ELF relocation info. We need this hack in order to
3203 be able to generate ELF binaries that can be translated into
3204 EFI applications (which are essentially COFF objects). Those
3205 files contain a COFF ".reloc" section inside an ELFNN object,
3206 which would normally cause BFD to segfault because it would
3207 attempt to interpret this section as containing relocation
3208 entries for section "oc". With this hack enabled, ".reloc"
3209 will be treated as a normal data section, which will avoid the
3210 segfault. However, you won't be able to create an ELFNN binary
3211 with a section named "oc" that needs relocations, but that's
3212 the kind of ugly side-effects you get when detecting section
3213 types based on their names... In practice, this limitation is
3214 unlikely to bite. */
3215 if (strcmp (name, ".reloc") == 0)
3216 hdr->sh_type = SHT_PROGBITS;
3217
3218 return TRUE;
3219 }
3220
3221 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3222 executables. Rather than setting it to the beginning of the TLS
3223 section, we have to set it to the end. This function may be called
3224 multiple times, it is idempotent. */
3225
3226 static void
3227 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3228 {
3229 struct elf_i386_link_hash_table *htab;
3230 struct bfd_link_hash_entry *base;
3231
3232 if (!info->executable)
3233 return;
3234
3235 htab = elf_i386_hash_table (info);
3236 if (htab == NULL)
3237 return;
3238
3239 base = htab->tls_module_base;
3240 if (base == NULL)
3241 return;
3242
3243 base->u.def.value = htab->elf.tls_size;
3244 }
3245
3246 /* Return the base VMA address which should be subtracted from real addresses
3247 when resolving @dtpoff relocation.
3248 This is PT_TLS segment p_vaddr. */
3249
3250 static bfd_vma
3251 elf_i386_dtpoff_base (struct bfd_link_info *info)
3252 {
3253 /* If tls_sec is NULL, we should have signalled an error already. */
3254 if (elf_hash_table (info)->tls_sec == NULL)
3255 return 0;
3256 return elf_hash_table (info)->tls_sec->vma;
3257 }
3258
3259 /* Return the relocation value for @tpoff relocation
3260 if STT_TLS virtual address is ADDRESS. */
3261
3262 static bfd_vma
3263 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3264 {
3265 struct elf_link_hash_table *htab = elf_hash_table (info);
3266 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3267 bfd_vma static_tls_size;
3268
3269 /* If tls_sec is NULL, we should have signalled an error already. */
3270 if (htab->tls_sec == NULL)
3271 return 0;
3272
3273 /* Consider special static TLS alignment requirements. */
3274 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3275 return static_tls_size + htab->tls_sec->vma - address;
3276 }
3277
3278 /* Relocate an i386 ELF section. */
3279
3280 static bfd_boolean
3281 elf_i386_relocate_section (bfd *output_bfd,
3282 struct bfd_link_info *info,
3283 bfd *input_bfd,
3284 asection *input_section,
3285 bfd_byte *contents,
3286 Elf_Internal_Rela *relocs,
3287 Elf_Internal_Sym *local_syms,
3288 asection **local_sections)
3289 {
3290 struct elf_i386_link_hash_table *htab;
3291 Elf_Internal_Shdr *symtab_hdr;
3292 struct elf_link_hash_entry **sym_hashes;
3293 bfd_vma *local_got_offsets;
3294 bfd_vma *local_tlsdesc_gotents;
3295 Elf_Internal_Rela *rel;
3296 Elf_Internal_Rela *relend;
3297 bfd_boolean is_vxworks_tls;
3298 unsigned plt_entry_size;
3299
3300 BFD_ASSERT (is_i386_elf (input_bfd));
3301
3302 htab = elf_i386_hash_table (info);
3303 if (htab == NULL)
3304 return FALSE;
3305 symtab_hdr = &elf_symtab_hdr (input_bfd);
3306 sym_hashes = elf_sym_hashes (input_bfd);
3307 local_got_offsets = elf_local_got_offsets (input_bfd);
3308 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3309 /* We have to handle relocations in vxworks .tls_vars sections
3310 specially, because the dynamic loader is 'weird'. */
3311 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3312 && info->shared
3313 && !strcmp (input_section->output_section->name,
3314 ".tls_vars"));
3315
3316 elf_i386_set_tls_module_base (info);
3317
3318 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3319
3320 rel = relocs;
3321 relend = relocs + input_section->reloc_count;
3322 for (; rel < relend; rel++)
3323 {
3324 unsigned int r_type;
3325 reloc_howto_type *howto;
3326 unsigned long r_symndx;
3327 struct elf_link_hash_entry *h;
3328 struct elf_i386_link_hash_entry *eh;
3329 Elf_Internal_Sym *sym;
3330 asection *sec;
3331 bfd_vma off, offplt, plt_offset;
3332 bfd_vma relocation;
3333 bfd_boolean unresolved_reloc;
3334 bfd_reloc_status_type r;
3335 unsigned int indx;
3336 int tls_type;
3337 bfd_vma st_size;
3338 asection *resolved_plt;
3339
3340 r_type = ELF32_R_TYPE (rel->r_info);
3341 if (r_type == R_386_GNU_VTINHERIT
3342 || r_type == R_386_GNU_VTENTRY)
3343 continue;
3344
3345 if ((indx = r_type) >= R_386_standard
3346 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3347 >= R_386_ext - R_386_standard)
3348 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3349 >= R_386_irelative - R_386_ext))
3350 {
3351 (*_bfd_error_handler)
3352 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3353 input_bfd, input_section, r_type);
3354 bfd_set_error (bfd_error_bad_value);
3355 return FALSE;
3356 }
3357 howto = elf_howto_table + indx;
3358
3359 r_symndx = ELF32_R_SYM (rel->r_info);
3360 h = NULL;
3361 sym = NULL;
3362 sec = NULL;
3363 unresolved_reloc = FALSE;
3364 if (r_symndx < symtab_hdr->sh_info)
3365 {
3366 sym = local_syms + r_symndx;
3367 sec = local_sections[r_symndx];
3368 relocation = (sec->output_section->vma
3369 + sec->output_offset
3370 + sym->st_value);
3371 st_size = sym->st_size;
3372
3373 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3374 && ((sec->flags & SEC_MERGE) != 0
3375 || (info->relocatable
3376 && sec->output_offset != 0)))
3377 {
3378 bfd_vma addend;
3379 bfd_byte *where = contents + rel->r_offset;
3380
3381 switch (howto->size)
3382 {
3383 case 0:
3384 addend = bfd_get_8 (input_bfd, where);
3385 if (howto->pc_relative)
3386 {
3387 addend = (addend ^ 0x80) - 0x80;
3388 addend += 1;
3389 }
3390 break;
3391 case 1:
3392 addend = bfd_get_16 (input_bfd, where);
3393 if (howto->pc_relative)
3394 {
3395 addend = (addend ^ 0x8000) - 0x8000;
3396 addend += 2;
3397 }
3398 break;
3399 case 2:
3400 addend = bfd_get_32 (input_bfd, where);
3401 if (howto->pc_relative)
3402 {
3403 addend = (addend ^ 0x80000000) - 0x80000000;
3404 addend += 4;
3405 }
3406 break;
3407 default:
3408 abort ();
3409 }
3410
3411 if (info->relocatable)
3412 addend += sec->output_offset;
3413 else
3414 {
3415 asection *msec = sec;
3416 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3417 addend);
3418 addend -= relocation;
3419 addend += msec->output_section->vma + msec->output_offset;
3420 }
3421
3422 switch (howto->size)
3423 {
3424 case 0:
3425 /* FIXME: overflow checks. */
3426 if (howto->pc_relative)
3427 addend -= 1;
3428 bfd_put_8 (input_bfd, addend, where);
3429 break;
3430 case 1:
3431 if (howto->pc_relative)
3432 addend -= 2;
3433 bfd_put_16 (input_bfd, addend, where);
3434 break;
3435 case 2:
3436 if (howto->pc_relative)
3437 addend -= 4;
3438 bfd_put_32 (input_bfd, addend, where);
3439 break;
3440 }
3441 }
3442 else if (!info->relocatable
3443 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3444 {
3445 /* Relocate against local STT_GNU_IFUNC symbol. */
3446 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3447 FALSE);
3448 if (h == NULL)
3449 abort ();
3450
3451 /* Set STT_GNU_IFUNC symbol value. */
3452 h->root.u.def.value = sym->st_value;
3453 h->root.u.def.section = sec;
3454 }
3455 }
3456 else
3457 {
3458 bfd_boolean warned ATTRIBUTE_UNUSED;
3459 bfd_boolean ignored ATTRIBUTE_UNUSED;
3460
3461 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3462 r_symndx, symtab_hdr, sym_hashes,
3463 h, sec, relocation,
3464 unresolved_reloc, warned, ignored);
3465 st_size = h->size;
3466 }
3467
3468 if (sec != NULL && discarded_section (sec))
3469 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3470 rel, 1, relend, howto, 0, contents);
3471
3472 if (info->relocatable)
3473 continue;
3474
3475 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3476 it here if it is defined in a non-shared object. */
3477 if (h != NULL
3478 && h->type == STT_GNU_IFUNC
3479 && h->def_regular)
3480 {
3481 asection *plt, *gotplt, *base_got;
3482 bfd_vma plt_index;
3483 const char *name;
3484
3485 if ((input_section->flags & SEC_ALLOC) == 0
3486 || h->plt.offset == (bfd_vma) -1)
3487 abort ();
3488
3489 /* STT_GNU_IFUNC symbol must go through PLT. */
3490 if (htab->elf.splt != NULL)
3491 {
3492 plt = htab->elf.splt;
3493 gotplt = htab->elf.sgotplt;
3494 }
3495 else
3496 {
3497 plt = htab->elf.iplt;
3498 gotplt = htab->elf.igotplt;
3499 }
3500
3501 relocation = (plt->output_section->vma
3502 + plt->output_offset + h->plt.offset);
3503
3504 switch (r_type)
3505 {
3506 default:
3507 if (h->root.root.string)
3508 name = h->root.root.string;
3509 else
3510 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3511 NULL);
3512 (*_bfd_error_handler)
3513 (_("%B: relocation %s against STT_GNU_IFUNC "
3514 "symbol `%s' isn't handled by %s"), input_bfd,
3515 elf_howto_table[r_type].name,
3516 name, __FUNCTION__);
3517 bfd_set_error (bfd_error_bad_value);
3518 return FALSE;
3519
3520 case R_386_32:
3521 /* Generate dynamic relcoation only when there is a
3522 non-GOT reference in a shared object. */
3523 if (info->shared && h->non_got_ref)
3524 {
3525 Elf_Internal_Rela outrel;
3526 asection *sreloc;
3527 bfd_vma offset;
3528
3529 /* Need a dynamic relocation to get the real function
3530 adddress. */
3531 offset = _bfd_elf_section_offset (output_bfd,
3532 info,
3533 input_section,
3534 rel->r_offset);
3535 if (offset == (bfd_vma) -1
3536 || offset == (bfd_vma) -2)
3537 abort ();
3538
3539 outrel.r_offset = (input_section->output_section->vma
3540 + input_section->output_offset
3541 + offset);
3542
3543 if (h->dynindx == -1
3544 || h->forced_local
3545 || info->executable)
3546 {
3547 /* This symbol is resolved locally. */
3548 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3549 bfd_put_32 (output_bfd,
3550 (h->root.u.def.value
3551 + h->root.u.def.section->output_section->vma
3552 + h->root.u.def.section->output_offset),
3553 contents + offset);
3554 }
3555 else
3556 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3557
3558 sreloc = htab->elf.irelifunc;
3559 elf_append_rel (output_bfd, sreloc, &outrel);
3560
3561 /* If this reloc is against an external symbol, we
3562 do not want to fiddle with the addend. Otherwise,
3563 we need to include the symbol value so that it
3564 becomes an addend for the dynamic reloc. For an
3565 internal symbol, we have updated addend. */
3566 continue;
3567 }
3568 /* FALLTHROUGH */
3569 case R_386_PC32:
3570 case R_386_PLT32:
3571 goto do_relocation;
3572
3573 case R_386_GOT32:
3574 base_got = htab->elf.sgot;
3575 off = h->got.offset;
3576
3577 if (base_got == NULL)
3578 abort ();
3579
3580 if (off == (bfd_vma) -1)
3581 {
3582 /* We can't use h->got.offset here to save state, or
3583 even just remember the offset, as finish_dynamic_symbol
3584 would use that as offset into .got. */
3585
3586 if (htab->elf.splt != NULL)
3587 {
3588 plt_index = h->plt.offset / plt_entry_size - 1;
3589 off = (plt_index + 3) * 4;
3590 base_got = htab->elf.sgotplt;
3591 }
3592 else
3593 {
3594 plt_index = h->plt.offset / plt_entry_size;
3595 off = plt_index * 4;
3596 base_got = htab->elf.igotplt;
3597 }
3598
3599 if (h->dynindx == -1
3600 || h->forced_local
3601 || info->symbolic)
3602 {
3603 /* This references the local defitionion. We must
3604 initialize this entry in the global offset table.
3605 Since the offset must always be a multiple of 8,
3606 we use the least significant bit to record
3607 whether we have initialized it already.
3608
3609 When doing a dynamic link, we create a .rela.got
3610 relocation entry to initialize the value. This
3611 is done in the finish_dynamic_symbol routine. */
3612 if ((off & 1) != 0)
3613 off &= ~1;
3614 else
3615 {
3616 bfd_put_32 (output_bfd, relocation,
3617 base_got->contents + off);
3618 h->got.offset |= 1;
3619 }
3620 }
3621
3622 relocation = off;
3623
3624 /* Adjust for static executables. */
3625 if (htab->elf.splt == NULL)
3626 relocation += gotplt->output_offset;
3627 }
3628 else
3629 {
3630 relocation = (base_got->output_section->vma
3631 + base_got->output_offset + off
3632 - gotplt->output_section->vma
3633 - gotplt->output_offset);
3634 /* Adjust for static executables. */
3635 if (htab->elf.splt == NULL)
3636 relocation += gotplt->output_offset;
3637 }
3638
3639 goto do_relocation;
3640
3641 case R_386_GOTOFF:
3642 relocation -= (gotplt->output_section->vma
3643 + gotplt->output_offset);
3644 goto do_relocation;
3645 }
3646 }
3647
3648 switch (r_type)
3649 {
3650 case R_386_GOT32:
3651 /* Relocation is to the entry for this symbol in the global
3652 offset table. */
3653 if (htab->elf.sgot == NULL)
3654 abort ();
3655
3656 if (h != NULL)
3657 {
3658 bfd_boolean dyn;
3659
3660 off = h->got.offset;
3661 dyn = htab->elf.dynamic_sections_created;
3662 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3663 || (info->shared
3664 && SYMBOL_REFERENCES_LOCAL (info, h))
3665 || (ELF_ST_VISIBILITY (h->other)
3666 && h->root.type == bfd_link_hash_undefweak))
3667 {
3668 /* This is actually a static link, or it is a
3669 -Bsymbolic link and the symbol is defined
3670 locally, or the symbol was forced to be local
3671 because of a version file. We must initialize
3672 this entry in the global offset table. Since the
3673 offset must always be a multiple of 4, we use the
3674 least significant bit to record whether we have
3675 initialized it already.
3676
3677 When doing a dynamic link, we create a .rel.got
3678 relocation entry to initialize the value. This
3679 is done in the finish_dynamic_symbol routine. */
3680 if ((off & 1) != 0)
3681 off &= ~1;
3682 else
3683 {
3684 bfd_put_32 (output_bfd, relocation,
3685 htab->elf.sgot->contents + off);
3686 h->got.offset |= 1;
3687 }
3688 }
3689 else
3690 unresolved_reloc = FALSE;
3691 }
3692 else
3693 {
3694 if (local_got_offsets == NULL)
3695 abort ();
3696
3697 off = local_got_offsets[r_symndx];
3698
3699 /* The offset must always be a multiple of 4. We use
3700 the least significant bit to record whether we have
3701 already generated the necessary reloc. */
3702 if ((off & 1) != 0)
3703 off &= ~1;
3704 else
3705 {
3706 bfd_put_32 (output_bfd, relocation,
3707 htab->elf.sgot->contents + off);
3708
3709 if (info->shared)
3710 {
3711 asection *s;
3712 Elf_Internal_Rela outrel;
3713
3714 s = htab->elf.srelgot;
3715 if (s == NULL)
3716 abort ();
3717
3718 outrel.r_offset = (htab->elf.sgot->output_section->vma
3719 + htab->elf.sgot->output_offset
3720 + off);
3721 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3722 elf_append_rel (output_bfd, s, &outrel);
3723 }
3724
3725 local_got_offsets[r_symndx] |= 1;
3726 }
3727 }
3728
3729 if (off >= (bfd_vma) -2)
3730 abort ();
3731
3732 relocation = htab->elf.sgot->output_section->vma
3733 + htab->elf.sgot->output_offset + off
3734 - htab->elf.sgotplt->output_section->vma
3735 - htab->elf.sgotplt->output_offset;
3736 break;
3737
3738 case R_386_GOTOFF:
3739 /* Relocation is relative to the start of the global offset
3740 table. */
3741
3742 /* Check to make sure it isn't a protected function or data
3743 symbol for shared library since it may not be local when
3744 used as function address or with copy relocation. We also
3745 need to make sure that a symbol is referenced locally. */
3746 if (!info->executable && h)
3747 {
3748 if (!h->def_regular)
3749 {
3750 const char *v;
3751
3752 switch (ELF_ST_VISIBILITY (h->other))
3753 {
3754 case STV_HIDDEN:
3755 v = _("hidden symbol");
3756 break;
3757 case STV_INTERNAL:
3758 v = _("internal symbol");
3759 break;
3760 case STV_PROTECTED:
3761 v = _("protected symbol");
3762 break;
3763 default:
3764 v = _("symbol");
3765 break;
3766 }
3767
3768 (*_bfd_error_handler)
3769 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3770 input_bfd, v, h->root.root.string);
3771 bfd_set_error (bfd_error_bad_value);
3772 return FALSE;
3773 }
3774 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3775 && (h->type == STT_FUNC
3776 || h->type == STT_OBJECT)
3777 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3778 {
3779 (*_bfd_error_handler)
3780 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3781 input_bfd,
3782 h->type == STT_FUNC ? "function" : "data",
3783 h->root.root.string);
3784 bfd_set_error (bfd_error_bad_value);
3785 return FALSE;
3786 }
3787 }
3788
3789 /* Note that sgot is not involved in this
3790 calculation. We always want the start of .got.plt. If we
3791 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3792 permitted by the ABI, we might have to change this
3793 calculation. */
3794 relocation -= htab->elf.sgotplt->output_section->vma
3795 + htab->elf.sgotplt->output_offset;
3796 break;
3797
3798 case R_386_GOTPC:
3799 /* Use global offset table as symbol value. */
3800 relocation = htab->elf.sgotplt->output_section->vma
3801 + htab->elf.sgotplt->output_offset;
3802 unresolved_reloc = FALSE;
3803 break;
3804
3805 case R_386_PLT32:
3806 /* Relocation is to the entry for this symbol in the
3807 procedure linkage table. */
3808
3809 /* Resolve a PLT32 reloc against a local symbol directly,
3810 without using the procedure linkage table. */
3811 if (h == NULL)
3812 break;
3813
3814 eh = (struct elf_i386_link_hash_entry *) h;
3815 if ((h->plt.offset == (bfd_vma) -1
3816 && eh->plt_got.offset == (bfd_vma) -1)
3817 || htab->elf.splt == NULL)
3818 {
3819 /* We didn't make a PLT entry for this symbol. This
3820 happens when statically linking PIC code, or when
3821 using -Bsymbolic. */
3822 break;
3823 }
3824
3825 if (h->plt.offset != (bfd_vma) -1)
3826 {
3827 resolved_plt = htab->elf.splt;
3828 plt_offset = h->plt.offset;
3829 }
3830 else
3831 {
3832 resolved_plt = htab->plt_got;
3833 plt_offset = eh->plt_got.offset;
3834 }
3835
3836 relocation = (resolved_plt->output_section->vma
3837 + resolved_plt->output_offset
3838 + plt_offset);
3839 unresolved_reloc = FALSE;
3840 break;
3841
3842 case R_386_SIZE32:
3843 /* Set to symbol size. */
3844 relocation = st_size;
3845 /* Fall through. */
3846
3847 case R_386_32:
3848 case R_386_PC32:
3849 if ((input_section->flags & SEC_ALLOC) == 0
3850 || is_vxworks_tls)
3851 break;
3852
3853 if ((info->shared
3854 && (h == NULL
3855 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3856 || h->root.type != bfd_link_hash_undefweak)
3857 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3858 || !SYMBOL_CALLS_LOCAL (info, h)))
3859 || (ELIMINATE_COPY_RELOCS
3860 && !info->shared
3861 && h != NULL
3862 && h->dynindx != -1
3863 && !h->non_got_ref
3864 && ((h->def_dynamic
3865 && !h->def_regular)
3866 || h->root.type == bfd_link_hash_undefweak
3867 || h->root.type == bfd_link_hash_undefined)))
3868 {
3869 Elf_Internal_Rela outrel;
3870 bfd_boolean skip, relocate;
3871 asection *sreloc;
3872
3873 /* When generating a shared object, these relocations
3874 are copied into the output file to be resolved at run
3875 time. */
3876
3877 skip = FALSE;
3878 relocate = FALSE;
3879
3880 outrel.r_offset =
3881 _bfd_elf_section_offset (output_bfd, info, input_section,
3882 rel->r_offset);
3883 if (outrel.r_offset == (bfd_vma) -1)
3884 skip = TRUE;
3885 else if (outrel.r_offset == (bfd_vma) -2)
3886 skip = TRUE, relocate = TRUE;
3887 outrel.r_offset += (input_section->output_section->vma
3888 + input_section->output_offset);
3889
3890 if (skip)
3891 memset (&outrel, 0, sizeof outrel);
3892 else if (h != NULL
3893 && h->dynindx != -1
3894 && (r_type == R_386_PC32
3895 || !info->shared
3896 || !SYMBOLIC_BIND (info, h)
3897 || !h->def_regular))
3898 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3899 else
3900 {
3901 /* This symbol is local, or marked to become local. */
3902 relocate = TRUE;
3903 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3904 }
3905
3906 sreloc = elf_section_data (input_section)->sreloc;
3907
3908 if (sreloc == NULL || sreloc->contents == NULL)
3909 {
3910 r = bfd_reloc_notsupported;
3911 goto check_relocation_error;
3912 }
3913
3914 elf_append_rel (output_bfd, sreloc, &outrel);
3915
3916 /* If this reloc is against an external symbol, we do
3917 not want to fiddle with the addend. Otherwise, we
3918 need to include the symbol value so that it becomes
3919 an addend for the dynamic reloc. */
3920 if (! relocate)
3921 continue;
3922 }
3923 break;
3924
3925 case R_386_TLS_IE:
3926 if (!info->executable)
3927 {
3928 Elf_Internal_Rela outrel;
3929 asection *sreloc;
3930
3931 outrel.r_offset = rel->r_offset
3932 + input_section->output_section->vma
3933 + input_section->output_offset;
3934 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3935 sreloc = elf_section_data (input_section)->sreloc;
3936 if (sreloc == NULL)
3937 abort ();
3938 elf_append_rel (output_bfd, sreloc, &outrel);
3939 }
3940 /* Fall through */
3941
3942 case R_386_TLS_GD:
3943 case R_386_TLS_GOTDESC:
3944 case R_386_TLS_DESC_CALL:
3945 case R_386_TLS_IE_32:
3946 case R_386_TLS_GOTIE:
3947 tls_type = GOT_UNKNOWN;
3948 if (h == NULL && local_got_offsets)
3949 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3950 else if (h != NULL)
3951 tls_type = elf_i386_hash_entry(h)->tls_type;
3952 if (tls_type == GOT_TLS_IE)
3953 tls_type = GOT_TLS_IE_NEG;
3954
3955 if (! elf_i386_tls_transition (info, input_bfd,
3956 input_section, contents,
3957 symtab_hdr, sym_hashes,
3958 &r_type, tls_type, rel,
3959 relend, h, r_symndx))
3960 return FALSE;
3961
3962 if (r_type == R_386_TLS_LE_32)
3963 {
3964 BFD_ASSERT (! unresolved_reloc);
3965 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3966 {
3967 unsigned int type;
3968 bfd_vma roff;
3969
3970 /* GD->LE transition. */
3971 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3972 if (type == 0x04)
3973 {
3974 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3975 Change it into:
3976 movl %gs:0, %eax; subl $foo@tpoff, %eax
3977 (6 byte form of subl). */
3978 memcpy (contents + rel->r_offset - 3,
3979 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3980 roff = rel->r_offset + 5;
3981 }
3982 else
3983 {
3984 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3985 Change it into:
3986 movl %gs:0, %eax; subl $foo@tpoff, %eax
3987 (6 byte form of subl). */
3988 memcpy (contents + rel->r_offset - 2,
3989 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3990 roff = rel->r_offset + 6;
3991 }
3992 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3993 contents + roff);
3994 /* Skip R_386_PC32/R_386_PLT32. */
3995 rel++;
3996 continue;
3997 }
3998 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3999 {
4000 /* GDesc -> LE transition.
4001 It's originally something like:
4002 leal x@tlsdesc(%ebx), %eax
4003
4004 leal x@ntpoff, %eax
4005
4006 Registers other than %eax may be set up here. */
4007
4008 unsigned int val;
4009 bfd_vma roff;
4010
4011 roff = rel->r_offset;
4012 val = bfd_get_8 (input_bfd, contents + roff - 1);
4013
4014 /* Now modify the instruction as appropriate. */
4015 /* aoliva FIXME: remove the above and xor the byte
4016 below with 0x86. */
4017 bfd_put_8 (output_bfd, val ^ 0x86,
4018 contents + roff - 1);
4019 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4020 contents + roff);
4021 continue;
4022 }
4023 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4024 {
4025 /* GDesc -> LE transition.
4026 It's originally:
4027 call *(%eax)
4028 Turn it into:
4029 xchg %ax,%ax */
4030
4031 bfd_vma roff;
4032
4033 roff = rel->r_offset;
4034 bfd_put_8 (output_bfd, 0x66, contents + roff);
4035 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4036 continue;
4037 }
4038 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4039 {
4040 unsigned int val;
4041
4042 /* IE->LE transition:
4043 Originally it can be one of:
4044 movl foo, %eax
4045 movl foo, %reg
4046 addl foo, %reg
4047 We change it into:
4048 movl $foo, %eax
4049 movl $foo, %reg
4050 addl $foo, %reg. */
4051 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4052 if (val == 0xa1)
4053 {
4054 /* movl foo, %eax. */
4055 bfd_put_8 (output_bfd, 0xb8,
4056 contents + rel->r_offset - 1);
4057 }
4058 else
4059 {
4060 unsigned int type;
4061
4062 type = bfd_get_8 (input_bfd,
4063 contents + rel->r_offset - 2);
4064 switch (type)
4065 {
4066 case 0x8b:
4067 /* movl */
4068 bfd_put_8 (output_bfd, 0xc7,
4069 contents + rel->r_offset - 2);
4070 bfd_put_8 (output_bfd,
4071 0xc0 | ((val >> 3) & 7),
4072 contents + rel->r_offset - 1);
4073 break;
4074 case 0x03:
4075 /* addl */
4076 bfd_put_8 (output_bfd, 0x81,
4077 contents + rel->r_offset - 2);
4078 bfd_put_8 (output_bfd,
4079 0xc0 | ((val >> 3) & 7),
4080 contents + rel->r_offset - 1);
4081 break;
4082 default:
4083 BFD_FAIL ();
4084 break;
4085 }
4086 }
4087 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4088 contents + rel->r_offset);
4089 continue;
4090 }
4091 else
4092 {
4093 unsigned int val, type;
4094
4095 /* {IE_32,GOTIE}->LE transition:
4096 Originally it can be one of:
4097 subl foo(%reg1), %reg2
4098 movl foo(%reg1), %reg2
4099 addl foo(%reg1), %reg2
4100 We change it into:
4101 subl $foo, %reg2
4102 movl $foo, %reg2 (6 byte form)
4103 addl $foo, %reg2. */
4104 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4105 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4106 if (type == 0x8b)
4107 {
4108 /* movl */
4109 bfd_put_8 (output_bfd, 0xc7,
4110 contents + rel->r_offset - 2);
4111 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4112 contents + rel->r_offset - 1);
4113 }
4114 else if (type == 0x2b)
4115 {
4116 /* subl */
4117 bfd_put_8 (output_bfd, 0x81,
4118 contents + rel->r_offset - 2);
4119 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4120 contents + rel->r_offset - 1);
4121 }
4122 else if (type == 0x03)
4123 {
4124 /* addl */
4125 bfd_put_8 (output_bfd, 0x81,
4126 contents + rel->r_offset - 2);
4127 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4128 contents + rel->r_offset - 1);
4129 }
4130 else
4131 BFD_FAIL ();
4132 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4133 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4134 contents + rel->r_offset);
4135 else
4136 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4137 contents + rel->r_offset);
4138 continue;
4139 }
4140 }
4141
4142 if (htab->elf.sgot == NULL)
4143 abort ();
4144
4145 if (h != NULL)
4146 {
4147 off = h->got.offset;
4148 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4149 }
4150 else
4151 {
4152 if (local_got_offsets == NULL)
4153 abort ();
4154
4155 off = local_got_offsets[r_symndx];
4156 offplt = local_tlsdesc_gotents[r_symndx];
4157 }
4158
4159 if ((off & 1) != 0)
4160 off &= ~1;
4161 else
4162 {
4163 Elf_Internal_Rela outrel;
4164 int dr_type;
4165 asection *sreloc;
4166
4167 if (htab->elf.srelgot == NULL)
4168 abort ();
4169
4170 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4171
4172 if (GOT_TLS_GDESC_P (tls_type))
4173 {
4174 bfd_byte *loc;
4175 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4176 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4177 <= htab->elf.sgotplt->size);
4178 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4179 + htab->elf.sgotplt->output_offset
4180 + offplt
4181 + htab->sgotplt_jump_table_size);
4182 sreloc = htab->elf.srelplt;
4183 loc = sreloc->contents;
4184 loc += (htab->next_tls_desc_index++
4185 * sizeof (Elf32_External_Rel));
4186 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4187 <= sreloc->contents + sreloc->size);
4188 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4189 if (indx == 0)
4190 {
4191 BFD_ASSERT (! unresolved_reloc);
4192 bfd_put_32 (output_bfd,
4193 relocation - elf_i386_dtpoff_base (info),
4194 htab->elf.sgotplt->contents + offplt
4195 + htab->sgotplt_jump_table_size + 4);
4196 }
4197 else
4198 {
4199 bfd_put_32 (output_bfd, 0,
4200 htab->elf.sgotplt->contents + offplt
4201 + htab->sgotplt_jump_table_size + 4);
4202 }
4203 }
4204
4205 sreloc = htab->elf.srelgot;
4206
4207 outrel.r_offset = (htab->elf.sgot->output_section->vma
4208 + htab->elf.sgot->output_offset + off);
4209
4210 if (GOT_TLS_GD_P (tls_type))
4211 dr_type = R_386_TLS_DTPMOD32;
4212 else if (GOT_TLS_GDESC_P (tls_type))
4213 goto dr_done;
4214 else if (tls_type == GOT_TLS_IE_POS)
4215 dr_type = R_386_TLS_TPOFF;
4216 else
4217 dr_type = R_386_TLS_TPOFF32;
4218
4219 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4220 bfd_put_32 (output_bfd,
4221 relocation - elf_i386_dtpoff_base (info),
4222 htab->elf.sgot->contents + off);
4223 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4224 bfd_put_32 (output_bfd,
4225 elf_i386_dtpoff_base (info) - relocation,
4226 htab->elf.sgot->contents + off);
4227 else if (dr_type != R_386_TLS_DESC)
4228 bfd_put_32 (output_bfd, 0,
4229 htab->elf.sgot->contents + off);
4230 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4231
4232 elf_append_rel (output_bfd, sreloc, &outrel);
4233
4234 if (GOT_TLS_GD_P (tls_type))
4235 {
4236 if (indx == 0)
4237 {
4238 BFD_ASSERT (! unresolved_reloc);
4239 bfd_put_32 (output_bfd,
4240 relocation - elf_i386_dtpoff_base (info),
4241 htab->elf.sgot->contents + off + 4);
4242 }
4243 else
4244 {
4245 bfd_put_32 (output_bfd, 0,
4246 htab->elf.sgot->contents + off + 4);
4247 outrel.r_info = ELF32_R_INFO (indx,
4248 R_386_TLS_DTPOFF32);
4249 outrel.r_offset += 4;
4250 elf_append_rel (output_bfd, sreloc, &outrel);
4251 }
4252 }
4253 else if (tls_type == GOT_TLS_IE_BOTH)
4254 {
4255 bfd_put_32 (output_bfd,
4256 (indx == 0
4257 ? relocation - elf_i386_dtpoff_base (info)
4258 : 0),
4259 htab->elf.sgot->contents + off + 4);
4260 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4261 outrel.r_offset += 4;
4262 elf_append_rel (output_bfd, sreloc, &outrel);
4263 }
4264
4265 dr_done:
4266 if (h != NULL)
4267 h->got.offset |= 1;
4268 else
4269 local_got_offsets[r_symndx] |= 1;
4270 }
4271
4272 if (off >= (bfd_vma) -2
4273 && ! GOT_TLS_GDESC_P (tls_type))
4274 abort ();
4275 if (r_type == R_386_TLS_GOTDESC
4276 || r_type == R_386_TLS_DESC_CALL)
4277 {
4278 relocation = htab->sgotplt_jump_table_size + offplt;
4279 unresolved_reloc = FALSE;
4280 }
4281 else if (r_type == ELF32_R_TYPE (rel->r_info))
4282 {
4283 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4284 + htab->elf.sgotplt->output_offset;
4285 relocation = htab->elf.sgot->output_section->vma
4286 + htab->elf.sgot->output_offset + off - g_o_t;
4287 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4288 && tls_type == GOT_TLS_IE_BOTH)
4289 relocation += 4;
4290 if (r_type == R_386_TLS_IE)
4291 relocation += g_o_t;
4292 unresolved_reloc = FALSE;
4293 }
4294 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4295 {
4296 unsigned int val, type;
4297 bfd_vma roff;
4298
4299 /* GD->IE transition. */
4300 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4301 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4302 if (type == 0x04)
4303 {
4304 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4305 Change it into:
4306 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4307 val >>= 3;
4308 roff = rel->r_offset - 3;
4309 }
4310 else
4311 {
4312 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4313 Change it into:
4314 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4315 roff = rel->r_offset - 2;
4316 }
4317 memcpy (contents + roff,
4318 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4319 contents[roff + 7] = 0x80 | (val & 7);
4320 /* If foo is used only with foo@gotntpoff(%reg) and
4321 foo@indntpoff, but not with foo@gottpoff(%reg), change
4322 subl $foo@gottpoff(%reg), %eax
4323 into:
4324 addl $foo@gotntpoff(%reg), %eax. */
4325 if (tls_type == GOT_TLS_IE_POS)
4326 contents[roff + 6] = 0x03;
4327 bfd_put_32 (output_bfd,
4328 htab->elf.sgot->output_section->vma
4329 + htab->elf.sgot->output_offset + off
4330 - htab->elf.sgotplt->output_section->vma
4331 - htab->elf.sgotplt->output_offset,
4332 contents + roff + 8);
4333 /* Skip R_386_PLT32. */
4334 rel++;
4335 continue;
4336 }
4337 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4338 {
4339 /* GDesc -> IE transition.
4340 It's originally something like:
4341 leal x@tlsdesc(%ebx), %eax
4342
4343 Change it to:
4344 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4345 or:
4346 movl x@gottpoff(%ebx), %eax # before negl %eax
4347
4348 Registers other than %eax may be set up here. */
4349
4350 bfd_vma roff;
4351
4352 /* First, make sure it's a leal adding ebx to a 32-bit
4353 offset into any register, although it's probably
4354 almost always going to be eax. */
4355 roff = rel->r_offset;
4356
4357 /* Now modify the instruction as appropriate. */
4358 /* To turn a leal into a movl in the form we use it, it
4359 suffices to change the first byte from 0x8d to 0x8b.
4360 aoliva FIXME: should we decide to keep the leal, all
4361 we have to do is remove the statement below, and
4362 adjust the relaxation of R_386_TLS_DESC_CALL. */
4363 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4364
4365 if (tls_type == GOT_TLS_IE_BOTH)
4366 off += 4;
4367
4368 bfd_put_32 (output_bfd,
4369 htab->elf.sgot->output_section->vma
4370 + htab->elf.sgot->output_offset + off
4371 - htab->elf.sgotplt->output_section->vma
4372 - htab->elf.sgotplt->output_offset,
4373 contents + roff);
4374 continue;
4375 }
4376 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4377 {
4378 /* GDesc -> IE transition.
4379 It's originally:
4380 call *(%eax)
4381
4382 Change it to:
4383 xchg %ax,%ax
4384 or
4385 negl %eax
4386 depending on how we transformed the TLS_GOTDESC above.
4387 */
4388
4389 bfd_vma roff;
4390
4391 roff = rel->r_offset;
4392
4393 /* Now modify the instruction as appropriate. */
4394 if (tls_type != GOT_TLS_IE_NEG)
4395 {
4396 /* xchg %ax,%ax */
4397 bfd_put_8 (output_bfd, 0x66, contents + roff);
4398 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4399 }
4400 else
4401 {
4402 /* negl %eax */
4403 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4404 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4405 }
4406
4407 continue;
4408 }
4409 else
4410 BFD_ASSERT (FALSE);
4411 break;
4412
4413 case R_386_TLS_LDM:
4414 if (! elf_i386_tls_transition (info, input_bfd,
4415 input_section, contents,
4416 symtab_hdr, sym_hashes,
4417 &r_type, GOT_UNKNOWN, rel,
4418 relend, h, r_symndx))
4419 return FALSE;
4420
4421 if (r_type != R_386_TLS_LDM)
4422 {
4423 /* LD->LE transition:
4424 leal foo(%reg), %eax; call ___tls_get_addr.
4425 We change it into:
4426 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4427 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4428 memcpy (contents + rel->r_offset - 2,
4429 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4430 /* Skip R_386_PC32/R_386_PLT32. */
4431 rel++;
4432 continue;
4433 }
4434
4435 if (htab->elf.sgot == NULL)
4436 abort ();
4437
4438 off = htab->tls_ldm_got.offset;
4439 if (off & 1)
4440 off &= ~1;
4441 else
4442 {
4443 Elf_Internal_Rela outrel;
4444
4445 if (htab->elf.srelgot == NULL)
4446 abort ();
4447
4448 outrel.r_offset = (htab->elf.sgot->output_section->vma
4449 + htab->elf.sgot->output_offset + off);
4450
4451 bfd_put_32 (output_bfd, 0,
4452 htab->elf.sgot->contents + off);
4453 bfd_put_32 (output_bfd, 0,
4454 htab->elf.sgot->contents + off + 4);
4455 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4456 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4457 htab->tls_ldm_got.offset |= 1;
4458 }
4459 relocation = htab->elf.sgot->output_section->vma
4460 + htab->elf.sgot->output_offset + off
4461 - htab->elf.sgotplt->output_section->vma
4462 - htab->elf.sgotplt->output_offset;
4463 unresolved_reloc = FALSE;
4464 break;
4465
4466 case R_386_TLS_LDO_32:
4467 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4468 relocation -= elf_i386_dtpoff_base (info);
4469 else
4470 /* When converting LDO to LE, we must negate. */
4471 relocation = -elf_i386_tpoff (info, relocation);
4472 break;
4473
4474 case R_386_TLS_LE_32:
4475 case R_386_TLS_LE:
4476 if (!info->executable)
4477 {
4478 Elf_Internal_Rela outrel;
4479 asection *sreloc;
4480
4481 outrel.r_offset = rel->r_offset
4482 + input_section->output_section->vma
4483 + input_section->output_offset;
4484 if (h != NULL && h->dynindx != -1)
4485 indx = h->dynindx;
4486 else
4487 indx = 0;
4488 if (r_type == R_386_TLS_LE_32)
4489 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4490 else
4491 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4492 sreloc = elf_section_data (input_section)->sreloc;
4493 if (sreloc == NULL)
4494 abort ();
4495 elf_append_rel (output_bfd, sreloc, &outrel);
4496 if (indx)
4497 continue;
4498 else if (r_type == R_386_TLS_LE_32)
4499 relocation = elf_i386_dtpoff_base (info) - relocation;
4500 else
4501 relocation -= elf_i386_dtpoff_base (info);
4502 }
4503 else if (r_type == R_386_TLS_LE_32)
4504 relocation = elf_i386_tpoff (info, relocation);
4505 else
4506 relocation = -elf_i386_tpoff (info, relocation);
4507 break;
4508
4509 default:
4510 break;
4511 }
4512
4513 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4514 because such sections are not SEC_ALLOC and thus ld.so will
4515 not process them. */
4516 if (unresolved_reloc
4517 && !((input_section->flags & SEC_DEBUGGING) != 0
4518 && h->def_dynamic)
4519 && _bfd_elf_section_offset (output_bfd, info, input_section,
4520 rel->r_offset) != (bfd_vma) -1)
4521 {
4522 (*_bfd_error_handler)
4523 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4524 input_bfd,
4525 input_section,
4526 (long) rel->r_offset,
4527 howto->name,
4528 h->root.root.string);
4529 return FALSE;
4530 }
4531
4532 do_relocation:
4533 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4534 contents, rel->r_offset,
4535 relocation, 0);
4536
4537 check_relocation_error:
4538 if (r != bfd_reloc_ok)
4539 {
4540 const char *name;
4541
4542 if (h != NULL)
4543 name = h->root.root.string;
4544 else
4545 {
4546 name = bfd_elf_string_from_elf_section (input_bfd,
4547 symtab_hdr->sh_link,
4548 sym->st_name);
4549 if (name == NULL)
4550 return FALSE;
4551 if (*name == '\0')
4552 name = bfd_section_name (input_bfd, sec);
4553 }
4554
4555 if (r == bfd_reloc_overflow)
4556 {
4557 if (! ((*info->callbacks->reloc_overflow)
4558 (info, (h ? &h->root : NULL), name, howto->name,
4559 (bfd_vma) 0, input_bfd, input_section,
4560 rel->r_offset)))
4561 return FALSE;
4562 }
4563 else
4564 {
4565 (*_bfd_error_handler)
4566 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4567 input_bfd, input_section,
4568 (long) rel->r_offset, name, (int) r);
4569 return FALSE;
4570 }
4571 }
4572 }
4573
4574 return TRUE;
4575 }
4576
4577 /* Finish up dynamic symbol handling. We set the contents of various
4578 dynamic sections here. */
4579
4580 static bfd_boolean
4581 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4582 struct bfd_link_info *info,
4583 struct elf_link_hash_entry *h,
4584 Elf_Internal_Sym *sym)
4585 {
4586 struct elf_i386_link_hash_table *htab;
4587 unsigned plt_entry_size;
4588 const struct elf_i386_backend_data *abed;
4589 struct elf_i386_link_hash_entry *eh;
4590
4591 htab = elf_i386_hash_table (info);
4592 if (htab == NULL)
4593 return FALSE;
4594
4595 abed = get_elf_i386_backend_data (output_bfd);
4596 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4597
4598 eh = (struct elf_i386_link_hash_entry *) h;
4599
4600 if (h->plt.offset != (bfd_vma) -1)
4601 {
4602 bfd_vma plt_index;
4603 bfd_vma got_offset;
4604 Elf_Internal_Rela rel;
4605 bfd_byte *loc;
4606 asection *plt, *gotplt, *relplt;
4607
4608 /* When building a static executable, use .iplt, .igot.plt and
4609 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4610 if (htab->elf.splt != NULL)
4611 {
4612 plt = htab->elf.splt;
4613 gotplt = htab->elf.sgotplt;
4614 relplt = htab->elf.srelplt;
4615 }
4616 else
4617 {
4618 plt = htab->elf.iplt;
4619 gotplt = htab->elf.igotplt;
4620 relplt = htab->elf.irelplt;
4621 }
4622
4623 /* This symbol has an entry in the procedure linkage table. Set
4624 it up. */
4625
4626 if ((h->dynindx == -1
4627 && !((h->forced_local || info->executable)
4628 && h->def_regular
4629 && h->type == STT_GNU_IFUNC))
4630 || plt == NULL
4631 || gotplt == NULL
4632 || relplt == NULL)
4633 abort ();
4634
4635 /* Get the index in the procedure linkage table which
4636 corresponds to this symbol. This is the index of this symbol
4637 in all the symbols for which we are making plt entries. The
4638 first entry in the procedure linkage table is reserved.
4639
4640 Get the offset into the .got table of the entry that
4641 corresponds to this function. Each .got entry is 4 bytes.
4642 The first three are reserved.
4643
4644 For static executables, we don't reserve anything. */
4645
4646 if (plt == htab->elf.splt)
4647 {
4648 got_offset = h->plt.offset / plt_entry_size - 1;
4649 got_offset = (got_offset + 3) * 4;
4650 }
4651 else
4652 {
4653 got_offset = h->plt.offset / plt_entry_size;
4654 got_offset = got_offset * 4;
4655 }
4656
4657 /* Fill in the entry in the procedure linkage table. */
4658 if (! info->shared)
4659 {
4660 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4661 abed->plt->plt_entry_size);
4662 bfd_put_32 (output_bfd,
4663 (gotplt->output_section->vma
4664 + gotplt->output_offset
4665 + got_offset),
4666 plt->contents + h->plt.offset
4667 + abed->plt->plt_got_offset);
4668
4669 if (abed->is_vxworks)
4670 {
4671 int s, k, reloc_index;
4672
4673 /* Create the R_386_32 relocation referencing the GOT
4674 for this PLT entry. */
4675
4676 /* S: Current slot number (zero-based). */
4677 s = ((h->plt.offset - abed->plt->plt_entry_size)
4678 / abed->plt->plt_entry_size);
4679 /* K: Number of relocations for PLTResolve. */
4680 if (info->shared)
4681 k = PLTRESOLVE_RELOCS_SHLIB;
4682 else
4683 k = PLTRESOLVE_RELOCS;
4684 /* Skip the PLTresolve relocations, and the relocations for
4685 the other PLT slots. */
4686 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4687 loc = (htab->srelplt2->contents + reloc_index
4688 * sizeof (Elf32_External_Rel));
4689
4690 rel.r_offset = (htab->elf.splt->output_section->vma
4691 + htab->elf.splt->output_offset
4692 + h->plt.offset + 2),
4693 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4694 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4695
4696 /* Create the R_386_32 relocation referencing the beginning of
4697 the PLT for this GOT entry. */
4698 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4699 + htab->elf.sgotplt->output_offset
4700 + got_offset);
4701 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4702 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4703 loc + sizeof (Elf32_External_Rel));
4704 }
4705 }
4706 else
4707 {
4708 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4709 abed->plt->plt_entry_size);
4710 bfd_put_32 (output_bfd, got_offset,
4711 plt->contents + h->plt.offset
4712 + abed->plt->plt_got_offset);
4713 }
4714
4715 /* Fill in the entry in the global offset table. */
4716 bfd_put_32 (output_bfd,
4717 (plt->output_section->vma
4718 + plt->output_offset
4719 + h->plt.offset
4720 + abed->plt->plt_lazy_offset),
4721 gotplt->contents + got_offset);
4722
4723 /* Fill in the entry in the .rel.plt section. */
4724 rel.r_offset = (gotplt->output_section->vma
4725 + gotplt->output_offset
4726 + got_offset);
4727 if (h->dynindx == -1
4728 || ((info->executable
4729 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4730 && h->def_regular
4731 && h->type == STT_GNU_IFUNC))
4732 {
4733 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4734 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4735 in the .got.plt section. */
4736 bfd_put_32 (output_bfd,
4737 (h->root.u.def.value
4738 + h->root.u.def.section->output_section->vma
4739 + h->root.u.def.section->output_offset),
4740 gotplt->contents + got_offset);
4741 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4742 /* R_386_IRELATIVE comes last. */
4743 plt_index = htab->next_irelative_index--;
4744 }
4745 else
4746 {
4747 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4748 plt_index = htab->next_jump_slot_index++;
4749 }
4750 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4751 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4752
4753 /* Don't fill PLT entry for static executables. */
4754 if (plt == htab->elf.splt)
4755 {
4756 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4757 plt->contents + h->plt.offset
4758 + abed->plt->plt_reloc_offset);
4759 bfd_put_32 (output_bfd, - (h->plt.offset
4760 + abed->plt->plt_plt_offset + 4),
4761 plt->contents + h->plt.offset
4762 + abed->plt->plt_plt_offset);
4763 }
4764 }
4765 else if (eh->plt_got.offset != (bfd_vma) -1)
4766 {
4767 bfd_vma got_offset, plt_offset;
4768 asection *plt, *got, *gotplt;
4769 const bfd_byte *got_plt_entry;
4770
4771 /* Offset of displacement of the indirect jump. */
4772 bfd_vma plt_got_offset = 2;
4773
4774 /* Set the entry in the GOT procedure linkage table. */
4775 plt = htab->plt_got;
4776 got = htab->elf.sgot;
4777 gotplt = htab->elf.sgotplt;
4778 got_offset = h->got.offset;
4779
4780 if (got_offset == (bfd_vma) -1
4781 || plt == NULL
4782 || got == NULL
4783 || gotplt == NULL)
4784 abort ();
4785
4786 /* Fill in the entry in the GOT procedure linkage table. */
4787 if (! info->shared)
4788 {
4789 got_plt_entry = elf_i386_got_plt_entry;
4790 got_offset += got->output_section->vma + got->output_offset;
4791 }
4792 else
4793 {
4794 got_plt_entry = elf_i386_pic_got_plt_entry;
4795 got_offset += (got->output_section->vma
4796 + got->output_offset
4797 - gotplt->output_section->vma
4798 - gotplt->output_offset);
4799 }
4800
4801 plt_offset = eh->plt_got.offset;
4802 memcpy (plt->contents + plt_offset, got_plt_entry,
4803 sizeof (elf_i386_got_plt_entry));
4804 bfd_put_32 (output_bfd, got_offset,
4805 plt->contents + plt_offset + plt_got_offset);
4806 }
4807
4808 if (!h->def_regular
4809 && (h->plt.offset != (bfd_vma) -1
4810 || eh->plt_got.offset != (bfd_vma) -1))
4811 {
4812 /* Mark the symbol as undefined, rather than as defined in
4813 the .plt section. Leave the value if there were any
4814 relocations where pointer equality matters (this is a clue
4815 for the dynamic linker, to make function pointer
4816 comparisons work between an application and shared
4817 library), otherwise set it to zero. If a function is only
4818 called from a binary, there is no need to slow down
4819 shared libraries because of that. */
4820 sym->st_shndx = SHN_UNDEF;
4821 if (!h->pointer_equality_needed)
4822 sym->st_value = 0;
4823 }
4824
4825 if (h->got.offset != (bfd_vma) -1
4826 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4827 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4828 {
4829 Elf_Internal_Rela rel;
4830
4831 /* This symbol has an entry in the global offset table. Set it
4832 up. */
4833
4834 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4835 abort ();
4836
4837 rel.r_offset = (htab->elf.sgot->output_section->vma
4838 + htab->elf.sgot->output_offset
4839 + (h->got.offset & ~(bfd_vma) 1));
4840
4841 /* If this is a static link, or it is a -Bsymbolic link and the
4842 symbol is defined locally or was forced to be local because
4843 of a version file, we just want to emit a RELATIVE reloc.
4844 The entry in the global offset table will already have been
4845 initialized in the relocate_section function. */
4846 if (h->def_regular
4847 && h->type == STT_GNU_IFUNC)
4848 {
4849 if (info->shared)
4850 {
4851 /* Generate R_386_GLOB_DAT. */
4852 goto do_glob_dat;
4853 }
4854 else
4855 {
4856 asection *plt;
4857
4858 if (!h->pointer_equality_needed)
4859 abort ();
4860
4861 /* For non-shared object, we can't use .got.plt, which
4862 contains the real function addres if we need pointer
4863 equality. We load the GOT entry with the PLT entry. */
4864 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4865 bfd_put_32 (output_bfd,
4866 (plt->output_section->vma
4867 + plt->output_offset + h->plt.offset),
4868 htab->elf.sgot->contents + h->got.offset);
4869 return TRUE;
4870 }
4871 }
4872 else if (info->shared
4873 && SYMBOL_REFERENCES_LOCAL (info, h))
4874 {
4875 BFD_ASSERT((h->got.offset & 1) != 0);
4876 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4877 }
4878 else
4879 {
4880 BFD_ASSERT((h->got.offset & 1) == 0);
4881 do_glob_dat:
4882 bfd_put_32 (output_bfd, (bfd_vma) 0,
4883 htab->elf.sgot->contents + h->got.offset);
4884 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4885 }
4886
4887 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4888 }
4889
4890 if (h->needs_copy)
4891 {
4892 Elf_Internal_Rela rel;
4893
4894 /* This symbol needs a copy reloc. Set it up. */
4895
4896 if (h->dynindx == -1
4897 || (h->root.type != bfd_link_hash_defined
4898 && h->root.type != bfd_link_hash_defweak)
4899 || htab->srelbss == NULL)
4900 abort ();
4901
4902 rel.r_offset = (h->root.u.def.value
4903 + h->root.u.def.section->output_section->vma
4904 + h->root.u.def.section->output_offset);
4905 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4906 elf_append_rel (output_bfd, htab->srelbss, &rel);
4907 }
4908
4909 return TRUE;
4910 }
4911
4912 /* Finish up local dynamic symbol handling. We set the contents of
4913 various dynamic sections here. */
4914
4915 static bfd_boolean
4916 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4917 {
4918 struct elf_link_hash_entry *h
4919 = (struct elf_link_hash_entry *) *slot;
4920 struct bfd_link_info *info
4921 = (struct bfd_link_info *) inf;
4922
4923 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4924 h, NULL);
4925 }
4926
4927 /* Used to decide how to sort relocs in an optimal manner for the
4928 dynamic linker, before writing them out. */
4929
4930 static enum elf_reloc_type_class
4931 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4932 const asection *rel_sec ATTRIBUTE_UNUSED,
4933 const Elf_Internal_Rela *rela)
4934 {
4935 switch (ELF32_R_TYPE (rela->r_info))
4936 {
4937 case R_386_RELATIVE:
4938 return reloc_class_relative;
4939 case R_386_JUMP_SLOT:
4940 return reloc_class_plt;
4941 case R_386_COPY:
4942 return reloc_class_copy;
4943 default:
4944 return reloc_class_normal;
4945 }
4946 }
4947
4948 /* Finish up the dynamic sections. */
4949
4950 static bfd_boolean
4951 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4952 struct bfd_link_info *info)
4953 {
4954 struct elf_i386_link_hash_table *htab;
4955 bfd *dynobj;
4956 asection *sdyn;
4957 const struct elf_i386_backend_data *abed;
4958
4959 htab = elf_i386_hash_table (info);
4960 if (htab == NULL)
4961 return FALSE;
4962
4963 dynobj = htab->elf.dynobj;
4964 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4965 abed = get_elf_i386_backend_data (output_bfd);
4966
4967 if (htab->elf.dynamic_sections_created)
4968 {
4969 Elf32_External_Dyn *dyncon, *dynconend;
4970
4971 if (sdyn == NULL || htab->elf.sgot == NULL)
4972 abort ();
4973
4974 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4975 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4976 for (; dyncon < dynconend; dyncon++)
4977 {
4978 Elf_Internal_Dyn dyn;
4979 asection *s;
4980
4981 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4982
4983 switch (dyn.d_tag)
4984 {
4985 default:
4986 if (abed->is_vxworks
4987 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4988 break;
4989 continue;
4990
4991 case DT_PLTGOT:
4992 s = htab->elf.sgotplt;
4993 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4994 break;
4995
4996 case DT_JMPREL:
4997 s = htab->elf.srelplt;
4998 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4999 break;
5000
5001 case DT_PLTRELSZ:
5002 s = htab->elf.srelplt;
5003 dyn.d_un.d_val = s->size;
5004 break;
5005
5006 case DT_RELSZ:
5007 /* My reading of the SVR4 ABI indicates that the
5008 procedure linkage table relocs (DT_JMPREL) should be
5009 included in the overall relocs (DT_REL). This is
5010 what Solaris does. However, UnixWare can not handle
5011 that case. Therefore, we override the DT_RELSZ entry
5012 here to make it not include the JMPREL relocs. */
5013 s = htab->elf.srelplt;
5014 if (s == NULL)
5015 continue;
5016 dyn.d_un.d_val -= s->size;
5017 break;
5018
5019 case DT_REL:
5020 /* We may not be using the standard ELF linker script.
5021 If .rel.plt is the first .rel section, we adjust
5022 DT_REL to not include it. */
5023 s = htab->elf.srelplt;
5024 if (s == NULL)
5025 continue;
5026 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5027 continue;
5028 dyn.d_un.d_ptr += s->size;
5029 break;
5030 }
5031
5032 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5033 }
5034
5035 /* Fill in the first entry in the procedure linkage table. */
5036 if (htab->elf.splt && htab->elf.splt->size > 0)
5037 {
5038 if (info->shared)
5039 {
5040 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5041 abed->plt->plt0_entry_size);
5042 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5043 abed->plt0_pad_byte,
5044 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5045 }
5046 else
5047 {
5048 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5049 abed->plt->plt0_entry_size);
5050 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5051 abed->plt0_pad_byte,
5052 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5053 bfd_put_32 (output_bfd,
5054 (htab->elf.sgotplt->output_section->vma
5055 + htab->elf.sgotplt->output_offset
5056 + 4),
5057 htab->elf.splt->contents
5058 + abed->plt->plt0_got1_offset);
5059 bfd_put_32 (output_bfd,
5060 (htab->elf.sgotplt->output_section->vma
5061 + htab->elf.sgotplt->output_offset
5062 + 8),
5063 htab->elf.splt->contents
5064 + abed->plt->plt0_got2_offset);
5065
5066 if (abed->is_vxworks)
5067 {
5068 Elf_Internal_Rela rel;
5069
5070 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5071 On IA32 we use REL relocations so the addend goes in
5072 the PLT directly. */
5073 rel.r_offset = (htab->elf.splt->output_section->vma
5074 + htab->elf.splt->output_offset
5075 + abed->plt->plt0_got1_offset);
5076 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5077 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5078 htab->srelplt2->contents);
5079 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5080 rel.r_offset = (htab->elf.splt->output_section->vma
5081 + htab->elf.splt->output_offset
5082 + abed->plt->plt0_got2_offset);
5083 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5084 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5085 htab->srelplt2->contents +
5086 sizeof (Elf32_External_Rel));
5087 }
5088 }
5089
5090 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5091 really seem like the right value. */
5092 elf_section_data (htab->elf.splt->output_section)
5093 ->this_hdr.sh_entsize = 4;
5094
5095 /* Correct the .rel.plt.unloaded relocations. */
5096 if (abed->is_vxworks && !info->shared)
5097 {
5098 int num_plts = (htab->elf.splt->size
5099 / abed->plt->plt_entry_size) - 1;
5100 unsigned char *p;
5101
5102 p = htab->srelplt2->contents;
5103 if (info->shared)
5104 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5105 else
5106 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5107
5108 for (; num_plts; num_plts--)
5109 {
5110 Elf_Internal_Rela rel;
5111 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5112 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5113 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5114 p += sizeof (Elf32_External_Rel);
5115
5116 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5117 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5118 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5119 p += sizeof (Elf32_External_Rel);
5120 }
5121 }
5122 }
5123 }
5124
5125 if (htab->elf.sgotplt)
5126 {
5127 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5128 {
5129 (*_bfd_error_handler)
5130 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5131 return FALSE;
5132 }
5133
5134 /* Fill in the first three entries in the global offset table. */
5135 if (htab->elf.sgotplt->size > 0)
5136 {
5137 bfd_put_32 (output_bfd,
5138 (sdyn == NULL ? 0
5139 : sdyn->output_section->vma + sdyn->output_offset),
5140 htab->elf.sgotplt->contents);
5141 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5142 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5143 }
5144
5145 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5146 }
5147
5148 /* Adjust .eh_frame for .plt section. */
5149 if (htab->plt_eh_frame != NULL
5150 && htab->plt_eh_frame->contents != NULL)
5151 {
5152 if (htab->elf.splt != NULL
5153 && htab->elf.splt->size != 0
5154 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5155 && htab->elf.splt->output_section != NULL
5156 && htab->plt_eh_frame->output_section != NULL)
5157 {
5158 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5159 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5160 + htab->plt_eh_frame->output_offset
5161 + PLT_FDE_START_OFFSET;
5162 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5163 htab->plt_eh_frame->contents
5164 + PLT_FDE_START_OFFSET);
5165 }
5166 if (htab->plt_eh_frame->sec_info_type
5167 == SEC_INFO_TYPE_EH_FRAME)
5168 {
5169 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5170 htab->plt_eh_frame,
5171 htab->plt_eh_frame->contents))
5172 return FALSE;
5173 }
5174 }
5175
5176 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5177 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5178
5179 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5180 htab_traverse (htab->loc_hash_table,
5181 elf_i386_finish_local_dynamic_symbol,
5182 info);
5183
5184 return TRUE;
5185 }
5186
5187 /* Return an array of PLT entry symbol values. */
5188
5189 static bfd_vma *
5190 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5191 asection *relplt)
5192 {
5193 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5194 arelent *p;
5195 long count, i;
5196 bfd_vma *plt_sym_val;
5197 bfd_vma plt_offset;
5198 bfd_byte *plt_contents;
5199 const struct elf_i386_backend_data *bed
5200 = get_elf_i386_backend_data (abfd);
5201 Elf_Internal_Shdr *hdr;
5202
5203 /* Get the .plt section contents. */
5204 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5205 if (plt_contents == NULL)
5206 return NULL;
5207 if (!bfd_get_section_contents (abfd, (asection *) plt,
5208 plt_contents, 0, plt->size))
5209 {
5210 bad_return:
5211 free (plt_contents);
5212 return NULL;
5213 }
5214
5215 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5216 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5217 goto bad_return;
5218
5219 hdr = &elf_section_data (relplt)->this_hdr;
5220 count = relplt->size / hdr->sh_entsize;
5221
5222 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5223 if (plt_sym_val == NULL)
5224 goto bad_return;
5225
5226 for (i = 0; i < count; i++)
5227 plt_sym_val[i] = -1;
5228
5229 plt_offset = bed->plt->plt_entry_size;
5230 p = relplt->relocation;
5231 for (i = 0; i < count; i++, p++)
5232 {
5233 long reloc_index;
5234
5235 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5236 if (p->howto == NULL)
5237 continue;
5238
5239 if (p->howto->type != R_386_JUMP_SLOT
5240 && p->howto->type != R_386_IRELATIVE)
5241 continue;
5242
5243 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5244 + bed->plt->plt_reloc_offset));
5245 reloc_index /= sizeof (Elf32_External_Rel);
5246 if (reloc_index >= count)
5247 abort ();
5248 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5249 plt_offset += bed->plt->plt_entry_size;
5250 }
5251
5252 free (plt_contents);
5253
5254 return plt_sym_val;
5255 }
5256
5257 /* Similar to _bfd_elf_get_synthetic_symtab. */
5258
5259 static long
5260 elf_i386_get_synthetic_symtab (bfd *abfd,
5261 long symcount,
5262 asymbol **syms,
5263 long dynsymcount,
5264 asymbol **dynsyms,
5265 asymbol **ret)
5266 {
5267 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5268 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5269 dynsymcount, dynsyms, ret,
5270 plt,
5271 elf_i386_get_plt_sym_val);
5272 }
5273
5274 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5275
5276 static bfd_boolean
5277 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5278 {
5279 if (h->plt.offset != (bfd_vma) -1
5280 && !h->def_regular
5281 && !h->pointer_equality_needed)
5282 return FALSE;
5283
5284 return _bfd_elf_hash_symbol (h);
5285 }
5286
5287 /* Hook called by the linker routine which adds symbols from an object
5288 file. */
5289
5290 static bfd_boolean
5291 elf_i386_add_symbol_hook (bfd * abfd,
5292 struct bfd_link_info * info,
5293 Elf_Internal_Sym * sym,
5294 const char ** namep ATTRIBUTE_UNUSED,
5295 flagword * flagsp ATTRIBUTE_UNUSED,
5296 asection ** secp ATTRIBUTE_UNUSED,
5297 bfd_vma * valp ATTRIBUTE_UNUSED)
5298 {
5299 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5300 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5301 && (abfd->flags & DYNAMIC) == 0
5302 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5303 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5304
5305 return TRUE;
5306 }
5307
5308 #define TARGET_LITTLE_SYM i386_elf32_vec
5309 #define TARGET_LITTLE_NAME "elf32-i386"
5310 #define ELF_ARCH bfd_arch_i386
5311 #define ELF_TARGET_ID I386_ELF_DATA
5312 #define ELF_MACHINE_CODE EM_386
5313 #define ELF_MAXPAGESIZE 0x1000
5314
5315 #define elf_backend_can_gc_sections 1
5316 #define elf_backend_can_refcount 1
5317 #define elf_backend_want_got_plt 1
5318 #define elf_backend_plt_readonly 1
5319 #define elf_backend_want_plt_sym 0
5320 #define elf_backend_got_header_size 12
5321 #define elf_backend_plt_alignment 4
5322 #define elf_backend_extern_protected_data 1
5323
5324 /* Support RELA for objdump of prelink objects. */
5325 #define elf_info_to_howto elf_i386_info_to_howto_rel
5326 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5327
5328 #define bfd_elf32_mkobject elf_i386_mkobject
5329
5330 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5331 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5332 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5333 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5334 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5335
5336 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5337 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5338 #define elf_backend_check_relocs elf_i386_check_relocs
5339 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5340 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5341 #define elf_backend_fake_sections elf_i386_fake_sections
5342 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5343 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5344 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5345 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5346 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5347 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5348 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5349 #define elf_backend_relocate_section elf_i386_relocate_section
5350 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5351 #define elf_backend_always_size_sections elf_i386_always_size_sections
5352 #define elf_backend_omit_section_dynsym \
5353 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5354 #define elf_backend_hash_symbol elf_i386_hash_symbol
5355 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5356
5357 #include "elf32-target.h"
5358
5359 /* FreeBSD support. */
5360
5361 #undef TARGET_LITTLE_SYM
5362 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5363 #undef TARGET_LITTLE_NAME
5364 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5365 #undef ELF_OSABI
5366 #define ELF_OSABI ELFOSABI_FREEBSD
5367
5368 /* The kernel recognizes executables as valid only if they carry a
5369 "FreeBSD" label in the ELF header. So we put this label on all
5370 executables and (for simplicity) also all other object files. */
5371
5372 static void
5373 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5374 {
5375 _bfd_elf_post_process_headers (abfd, info);
5376
5377 #ifdef OLD_FREEBSD_ABI_LABEL
5378 {
5379 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5380 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5381 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5382 }
5383 #endif
5384 }
5385
5386 #undef elf_backend_post_process_headers
5387 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5388 #undef elf32_bed
5389 #define elf32_bed elf32_i386_fbsd_bed
5390
5391 #undef elf_backend_add_symbol_hook
5392
5393 #include "elf32-target.h"
5394
5395 /* Solaris 2. */
5396
5397 #undef TARGET_LITTLE_SYM
5398 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5399 #undef TARGET_LITTLE_NAME
5400 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5401
5402 #undef elf_backend_post_process_headers
5403
5404 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5405 objects won't be recognized. */
5406 #undef ELF_OSABI
5407
5408 #undef elf32_bed
5409 #define elf32_bed elf32_i386_sol2_bed
5410
5411 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5412 boundary. */
5413 #undef elf_backend_static_tls_alignment
5414 #define elf_backend_static_tls_alignment 8
5415
5416 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5417
5418 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5419 File, p.63. */
5420 #undef elf_backend_want_plt_sym
5421 #define elf_backend_want_plt_sym 1
5422
5423 #include "elf32-target.h"
5424
5425 /* Native Client support. */
5426
5427 #undef TARGET_LITTLE_SYM
5428 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5429 #undef TARGET_LITTLE_NAME
5430 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5431 #undef elf32_bed
5432 #define elf32_bed elf32_i386_nacl_bed
5433
5434 #undef ELF_MAXPAGESIZE
5435 #define ELF_MAXPAGESIZE 0x10000
5436
5437 /* Restore defaults. */
5438 #undef ELF_OSABI
5439 #undef elf_backend_want_plt_sym
5440 #define elf_backend_want_plt_sym 0
5441 #undef elf_backend_post_process_headers
5442 #undef elf_backend_static_tls_alignment
5443
5444 /* NaCl uses substantially different PLT entries for the same effects. */
5445
5446 #undef elf_backend_plt_alignment
5447 #define elf_backend_plt_alignment 5
5448 #define NACL_PLT_ENTRY_SIZE 64
5449 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5450
5451 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5452 {
5453 0xff, 0x35, /* pushl contents of address */
5454 0, 0, 0, 0, /* replaced with address of .got + 4. */
5455 0x8b, 0x0d, /* movl contents of address, %ecx */
5456 0, 0, 0, 0, /* replaced with address of .got + 8. */
5457 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5458 0xff, 0xe1 /* jmp *%ecx */
5459 };
5460
5461 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5462 {
5463 0x8b, 0x0d, /* movl contents of address, %ecx */
5464 0, 0, 0, 0, /* replaced with GOT slot address. */
5465 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5466 0xff, 0xe1, /* jmp *%ecx */
5467
5468 /* Pad to the next 32-byte boundary with nop instructions. */
5469 0x90,
5470 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5471 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5472
5473 /* Lazy GOT entries point here (32-byte aligned). */
5474 0x68, /* pushl immediate */
5475 0, 0, 0, 0, /* replaced with reloc offset. */
5476 0xe9, /* jmp relative */
5477 0, 0, 0, 0, /* replaced with offset to .plt. */
5478
5479 /* Pad to the next 32-byte boundary with nop instructions. */
5480 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5481 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5482 0x90, 0x90
5483 };
5484
5485 static const bfd_byte
5486 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5487 {
5488 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5489 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5490 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5491 0xff, 0xe1, /* jmp *%ecx */
5492
5493 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5494 so pad to that size with nop instructions. */
5495 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5496 };
5497
5498 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5499 {
5500 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5501 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5502 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5503 0xff, 0xe1, /* jmp *%ecx */
5504
5505 /* Pad to the next 32-byte boundary with nop instructions. */
5506 0x90,
5507 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5508 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5509
5510 /* Lazy GOT entries point here (32-byte aligned). */
5511 0x68, /* pushl immediate */
5512 0, 0, 0, 0, /* replaced with offset into relocation table. */
5513 0xe9, /* jmp relative */
5514 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5515
5516 /* Pad to the next 32-byte boundary with nop instructions. */
5517 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5518 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5519 0x90, 0x90
5520 };
5521
5522 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5523 {
5524 #if (PLT_CIE_LENGTH != 20 \
5525 || PLT_FDE_LENGTH != 36 \
5526 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5527 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5528 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5529 #endif
5530 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5531 0, 0, 0, 0, /* CIE ID */
5532 1, /* CIE version */
5533 'z', 'R', 0, /* Augmentation string */
5534 1, /* Code alignment factor */
5535 0x7c, /* Data alignment factor: -4 */
5536 8, /* Return address column */
5537 1, /* Augmentation size */
5538 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5539 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5540 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5541 DW_CFA_nop, DW_CFA_nop,
5542
5543 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5544 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5545 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5546 0, 0, 0, 0, /* .plt size goes here */
5547 0, /* Augmentation size */
5548 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5549 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5550 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5551 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5552 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5553 13, /* Block length */
5554 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5555 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5556 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5557 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5558 DW_CFA_nop, DW_CFA_nop
5559 };
5560
5561 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5562 {
5563 elf_i386_nacl_plt0_entry, /* plt0_entry */
5564 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5565 2, /* plt0_got1_offset */
5566 8, /* plt0_got2_offset */
5567 elf_i386_nacl_plt_entry, /* plt_entry */
5568 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5569 2, /* plt_got_offset */
5570 33, /* plt_reloc_offset */
5571 38, /* plt_plt_offset */
5572 32, /* plt_lazy_offset */
5573 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5574 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5575 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5576 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5577 };
5578
5579 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5580 {
5581 &elf_i386_nacl_plt, /* plt */
5582 0x90, /* plt0_pad_byte: nop insn */
5583 0, /* is_vxworks */
5584 };
5585
5586 static bfd_boolean
5587 elf32_i386_nacl_elf_object_p (bfd *abfd)
5588 {
5589 /* Set the right machine number for a NaCl i386 ELF32 file. */
5590 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5591 return TRUE;
5592 }
5593
5594 #undef elf_backend_arch_data
5595 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5596
5597 #undef elf_backend_object_p
5598 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5599 #undef elf_backend_modify_segment_map
5600 #define elf_backend_modify_segment_map nacl_modify_segment_map
5601 #undef elf_backend_modify_program_headers
5602 #define elf_backend_modify_program_headers nacl_modify_program_headers
5603 #undef elf_backend_final_write_processing
5604 #define elf_backend_final_write_processing nacl_final_write_processing
5605
5606 #include "elf32-target.h"
5607
5608 /* Restore defaults. */
5609 #undef elf_backend_object_p
5610 #undef elf_backend_modify_segment_map
5611 #undef elf_backend_modify_program_headers
5612 #undef elf_backend_final_write_processing
5613
5614 /* VxWorks support. */
5615
5616 #undef TARGET_LITTLE_SYM
5617 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5618 #undef TARGET_LITTLE_NAME
5619 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5620 #undef ELF_OSABI
5621 #undef elf_backend_plt_alignment
5622 #define elf_backend_plt_alignment 4
5623
5624 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5625 {
5626 &elf_i386_plt, /* plt */
5627 0x90, /* plt0_pad_byte */
5628 1, /* is_vxworks */
5629 };
5630
5631 #undef elf_backend_arch_data
5632 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5633
5634 #undef elf_backend_relocs_compatible
5635 #undef elf_backend_add_symbol_hook
5636 #define elf_backend_add_symbol_hook \
5637 elf_vxworks_add_symbol_hook
5638 #undef elf_backend_link_output_symbol_hook
5639 #define elf_backend_link_output_symbol_hook \
5640 elf_vxworks_link_output_symbol_hook
5641 #undef elf_backend_emit_relocs
5642 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5643 #undef elf_backend_final_write_processing
5644 #define elf_backend_final_write_processing \
5645 elf_vxworks_final_write_processing
5646 #undef elf_backend_static_tls_alignment
5647
5648 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5649 define it. */
5650 #undef elf_backend_want_plt_sym
5651 #define elf_backend_want_plt_sym 1
5652
5653 #undef elf32_bed
5654 #define elf32_bed elf32_i386_vxworks_bed
5655
5656 #include "elf32-target.h"
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