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Set EI_OSABI to ELFOSABI_GNU for local IFUNC symbols
[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 if (h->type == STT_GNU_IFUNC)
1581 elf_tdata (info->output_bfd)->has_gnu_symbols
1582 |= elf_gnu_symbol_ifunc;
1583 }
1584
1585 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1586 symtab_hdr, sym_hashes,
1587 &r_type, GOT_UNKNOWN,
1588 rel, rel_end, h, r_symndx))
1589 return FALSE;
1590
1591 switch (r_type)
1592 {
1593 case R_386_TLS_LDM:
1594 htab->tls_ldm_got.refcount += 1;
1595 goto create_got;
1596
1597 case R_386_PLT32:
1598 /* This symbol requires a procedure linkage table entry. We
1599 actually build the entry in adjust_dynamic_symbol,
1600 because this might be a case of linking PIC code which is
1601 never referenced by a dynamic object, in which case we
1602 don't need to generate a procedure linkage table entry
1603 after all. */
1604
1605 /* If this is a local symbol, we resolve it directly without
1606 creating a procedure linkage table entry. */
1607 if (h == NULL)
1608 continue;
1609
1610 h->needs_plt = 1;
1611 h->plt.refcount += 1;
1612 break;
1613
1614 case R_386_SIZE32:
1615 size_reloc = TRUE;
1616 goto do_size;
1617
1618 case R_386_TLS_IE_32:
1619 case R_386_TLS_IE:
1620 case R_386_TLS_GOTIE:
1621 if (!info->executable)
1622 info->flags |= DF_STATIC_TLS;
1623 /* Fall through */
1624
1625 case R_386_GOT32:
1626 case R_386_TLS_GD:
1627 case R_386_TLS_GOTDESC:
1628 case R_386_TLS_DESC_CALL:
1629 /* This symbol requires a global offset table entry. */
1630 {
1631 int tls_type, old_tls_type;
1632
1633 switch (r_type)
1634 {
1635 default:
1636 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1637 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 tls_type = GOT_TLS_GDESC; break;
1641 case R_386_TLS_IE_32:
1642 if (ELF32_R_TYPE (rel->r_info) == r_type)
1643 tls_type = GOT_TLS_IE_NEG;
1644 else
1645 /* If this is a GD->IE transition, we may use either of
1646 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1647 tls_type = GOT_TLS_IE;
1648 break;
1649 case R_386_TLS_IE:
1650 case R_386_TLS_GOTIE:
1651 tls_type = GOT_TLS_IE_POS; break;
1652 }
1653
1654 if (h != NULL)
1655 {
1656 h->got.refcount += 1;
1657 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1658 }
1659 else
1660 {
1661 bfd_signed_vma *local_got_refcounts;
1662
1663 /* This is a global offset table entry for a local symbol. */
1664 local_got_refcounts = elf_local_got_refcounts (abfd);
1665 if (local_got_refcounts == NULL)
1666 {
1667 bfd_size_type size;
1668
1669 size = symtab_hdr->sh_info;
1670 size *= (sizeof (bfd_signed_vma)
1671 + sizeof (bfd_vma) + sizeof(char));
1672 local_got_refcounts = (bfd_signed_vma *)
1673 bfd_zalloc (abfd, size);
1674 if (local_got_refcounts == NULL)
1675 return FALSE;
1676 elf_local_got_refcounts (abfd) = local_got_refcounts;
1677 elf_i386_local_tlsdesc_gotent (abfd)
1678 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1679 elf_i386_local_got_tls_type (abfd)
1680 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1681 }
1682 local_got_refcounts[r_symndx] += 1;
1683 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1684 }
1685
1686 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1687 tls_type |= old_tls_type;
1688 /* If a TLS symbol is accessed using IE at least once,
1689 there is no point to use dynamic model for it. */
1690 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1691 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1692 || (tls_type & GOT_TLS_IE) == 0))
1693 {
1694 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1695 tls_type = old_tls_type;
1696 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1697 && GOT_TLS_GD_ANY_P (tls_type))
1698 tls_type |= old_tls_type;
1699 else
1700 {
1701 if (h)
1702 name = h->root.root.string;
1703 else
1704 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1705 NULL);
1706 (*_bfd_error_handler)
1707 (_("%B: `%s' accessed both as normal and "
1708 "thread local symbol"),
1709 abfd, name);
1710 bfd_set_error (bfd_error_bad_value);
1711 return FALSE;
1712 }
1713 }
1714
1715 if (old_tls_type != tls_type)
1716 {
1717 if (h != NULL)
1718 elf_i386_hash_entry (h)->tls_type = tls_type;
1719 else
1720 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1721 }
1722 }
1723 /* Fall through */
1724
1725 case R_386_GOTOFF:
1726 case R_386_GOTPC:
1727 create_got:
1728 if (htab->elf.sgot == NULL)
1729 {
1730 if (htab->elf.dynobj == NULL)
1731 htab->elf.dynobj = abfd;
1732 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1733 return FALSE;
1734 }
1735 if (r_type != R_386_TLS_IE)
1736 break;
1737 /* Fall through */
1738
1739 case R_386_TLS_LE_32:
1740 case R_386_TLS_LE:
1741 if (info->executable)
1742 break;
1743 info->flags |= DF_STATIC_TLS;
1744 /* Fall through */
1745
1746 case R_386_32:
1747 case R_386_PC32:
1748 if (h != NULL && info->executable)
1749 {
1750 /* If this reloc is in a read-only section, we might
1751 need a copy reloc. We can't check reliably at this
1752 stage whether the section is read-only, as input
1753 sections have not yet been mapped to output sections.
1754 Tentatively set the flag for now, and correct in
1755 adjust_dynamic_symbol. */
1756 h->non_got_ref = 1;
1757
1758 /* We may need a .plt entry if the function this reloc
1759 refers to is in a shared lib. */
1760 h->plt.refcount += 1;
1761 if (r_type != R_386_PC32)
1762 h->pointer_equality_needed = 1;
1763 }
1764
1765 size_reloc = FALSE;
1766 do_size:
1767 /* If we are creating a shared library, and this is a reloc
1768 against a global symbol, or a non PC relative reloc
1769 against a local symbol, then we need to copy the reloc
1770 into the shared library. However, if we are linking with
1771 -Bsymbolic, we do not need to copy a reloc against a
1772 global symbol which is defined in an object we are
1773 including in the link (i.e., DEF_REGULAR is set). At
1774 this point we have not seen all the input files, so it is
1775 possible that DEF_REGULAR is not set now but will be set
1776 later (it is never cleared). In case of a weak definition,
1777 DEF_REGULAR may be cleared later by a strong definition in
1778 a shared library. We account for that possibility below by
1779 storing information in the relocs_copied field of the hash
1780 table entry. A similar situation occurs when creating
1781 shared libraries and symbol visibility changes render the
1782 symbol local.
1783
1784 If on the other hand, we are creating an executable, we
1785 may need to keep relocations for symbols satisfied by a
1786 dynamic library if we manage to avoid copy relocs for the
1787 symbol. */
1788 if ((info->shared
1789 && (sec->flags & SEC_ALLOC) != 0
1790 && (r_type != R_386_PC32
1791 || (h != NULL
1792 && (! SYMBOLIC_BIND (info, h)
1793 || h->root.type == bfd_link_hash_defweak
1794 || !h->def_regular))))
1795 || (ELIMINATE_COPY_RELOCS
1796 && !info->shared
1797 && (sec->flags & SEC_ALLOC) != 0
1798 && h != NULL
1799 && (h->root.type == bfd_link_hash_defweak
1800 || !h->def_regular)))
1801 {
1802 struct elf_dyn_relocs *p;
1803 struct elf_dyn_relocs **head;
1804
1805 /* We must copy these reloc types into the output file.
1806 Create a reloc section in dynobj and make room for
1807 this reloc. */
1808 if (sreloc == NULL)
1809 {
1810 if (htab->elf.dynobj == NULL)
1811 htab->elf.dynobj = abfd;
1812
1813 sreloc = _bfd_elf_make_dynamic_reloc_section
1814 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1815
1816 if (sreloc == NULL)
1817 return FALSE;
1818 }
1819
1820 /* If this is a global symbol, we count the number of
1821 relocations we need for this symbol. */
1822 if (h != NULL)
1823 {
1824 head = &eh->dyn_relocs;
1825 }
1826 else
1827 {
1828 /* Track dynamic relocs needed for local syms too.
1829 We really need local syms available to do this
1830 easily. Oh well. */
1831 void **vpp;
1832 asection *s;
1833
1834 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1835 abfd, r_symndx);
1836 if (isym == NULL)
1837 return FALSE;
1838
1839 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1840 if (s == NULL)
1841 s = sec;
1842
1843 vpp = &elf_section_data (s)->local_dynrel;
1844 head = (struct elf_dyn_relocs **)vpp;
1845 }
1846
1847 p = *head;
1848 if (p == NULL || p->sec != sec)
1849 {
1850 bfd_size_type amt = sizeof *p;
1851 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1852 amt);
1853 if (p == NULL)
1854 return FALSE;
1855 p->next = *head;
1856 *head = p;
1857 p->sec = sec;
1858 p->count = 0;
1859 p->pc_count = 0;
1860 }
1861
1862 p->count += 1;
1863 /* Count size relocation as PC-relative relocation. */
1864 if (r_type == R_386_PC32 || size_reloc)
1865 p->pc_count += 1;
1866 }
1867 break;
1868
1869 /* This relocation describes the C++ object vtable hierarchy.
1870 Reconstruct it for later use during GC. */
1871 case R_386_GNU_VTINHERIT:
1872 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1873 return FALSE;
1874 break;
1875
1876 /* This relocation describes which C++ vtable entries are actually
1877 used. Record for later use during GC. */
1878 case R_386_GNU_VTENTRY:
1879 BFD_ASSERT (h != NULL);
1880 if (h != NULL
1881 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1882 return FALSE;
1883 break;
1884
1885 default:
1886 break;
1887 }
1888
1889 if (use_plt_got
1890 && h != NULL
1891 && h->plt.refcount > 0
1892 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1893 || h->got.refcount > 0)
1894 && htab->plt_got == NULL)
1895 {
1896 /* Create the GOT procedure linkage table. */
1897 unsigned int plt_got_align;
1898 const struct elf_backend_data *bed;
1899
1900 bed = get_elf_backend_data (info->output_bfd);
1901 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1902 && (sizeof (elf_i386_got_plt_entry)
1903 == sizeof (elf_i386_pic_got_plt_entry)));
1904 plt_got_align = 3;
1905
1906 if (htab->elf.dynobj == NULL)
1907 htab->elf.dynobj = abfd;
1908 htab->plt_got
1909 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1910 ".plt.got",
1911 (bed->dynamic_sec_flags
1912 | SEC_ALLOC
1913 | SEC_CODE
1914 | SEC_LOAD
1915 | SEC_READONLY));
1916 if (htab->plt_got == NULL
1917 || !bfd_set_section_alignment (htab->elf.dynobj,
1918 htab->plt_got,
1919 plt_got_align))
1920 return FALSE;
1921 }
1922
1923 if (r_type == R_386_GOT32
1924 && (h == NULL || h->type != STT_GNU_IFUNC))
1925 sec->need_convert_mov_to_lea = 1;
1926 }
1927
1928 return TRUE;
1929 }
1930
1931 /* Return the section that should be marked against GC for a given
1932 relocation. */
1933
1934 static asection *
1935 elf_i386_gc_mark_hook (asection *sec,
1936 struct bfd_link_info *info,
1937 Elf_Internal_Rela *rel,
1938 struct elf_link_hash_entry *h,
1939 Elf_Internal_Sym *sym)
1940 {
1941 if (h != NULL)
1942 switch (ELF32_R_TYPE (rel->r_info))
1943 {
1944 case R_386_GNU_VTINHERIT:
1945 case R_386_GNU_VTENTRY:
1946 return NULL;
1947 }
1948
1949 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1950 }
1951
1952 /* Update the got entry reference counts for the section being removed. */
1953
1954 static bfd_boolean
1955 elf_i386_gc_sweep_hook (bfd *abfd,
1956 struct bfd_link_info *info,
1957 asection *sec,
1958 const Elf_Internal_Rela *relocs)
1959 {
1960 struct elf_i386_link_hash_table *htab;
1961 Elf_Internal_Shdr *symtab_hdr;
1962 struct elf_link_hash_entry **sym_hashes;
1963 bfd_signed_vma *local_got_refcounts;
1964 const Elf_Internal_Rela *rel, *relend;
1965
1966 if (info->relocatable)
1967 return TRUE;
1968
1969 htab = elf_i386_hash_table (info);
1970 if (htab == NULL)
1971 return FALSE;
1972
1973 elf_section_data (sec)->local_dynrel = NULL;
1974
1975 symtab_hdr = &elf_symtab_hdr (abfd);
1976 sym_hashes = elf_sym_hashes (abfd);
1977 local_got_refcounts = elf_local_got_refcounts (abfd);
1978
1979 relend = relocs + sec->reloc_count;
1980 for (rel = relocs; rel < relend; rel++)
1981 {
1982 unsigned long r_symndx;
1983 unsigned int r_type;
1984 struct elf_link_hash_entry *h = NULL;
1985
1986 r_symndx = ELF32_R_SYM (rel->r_info);
1987 if (r_symndx >= symtab_hdr->sh_info)
1988 {
1989 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1990 while (h->root.type == bfd_link_hash_indirect
1991 || h->root.type == bfd_link_hash_warning)
1992 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1993 }
1994 else
1995 {
1996 /* A local symbol. */
1997 Elf_Internal_Sym *isym;
1998
1999 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2000 abfd, r_symndx);
2001
2002 /* Check relocation against local STT_GNU_IFUNC symbol. */
2003 if (isym != NULL
2004 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2005 {
2006 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2007 if (h == NULL)
2008 abort ();
2009 }
2010 }
2011
2012 if (h)
2013 {
2014 struct elf_i386_link_hash_entry *eh;
2015 struct elf_dyn_relocs **pp;
2016 struct elf_dyn_relocs *p;
2017
2018 eh = (struct elf_i386_link_hash_entry *) h;
2019 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2020 if (p->sec == sec)
2021 {
2022 /* Everything must go for SEC. */
2023 *pp = p->next;
2024 break;
2025 }
2026 }
2027
2028 r_type = ELF32_R_TYPE (rel->r_info);
2029 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2030 symtab_hdr, sym_hashes,
2031 &r_type, GOT_UNKNOWN,
2032 rel, relend, h, r_symndx))
2033 return FALSE;
2034
2035 switch (r_type)
2036 {
2037 case R_386_TLS_LDM:
2038 if (htab->tls_ldm_got.refcount > 0)
2039 htab->tls_ldm_got.refcount -= 1;
2040 break;
2041
2042 case R_386_TLS_GD:
2043 case R_386_TLS_GOTDESC:
2044 case R_386_TLS_DESC_CALL:
2045 case R_386_TLS_IE_32:
2046 case R_386_TLS_IE:
2047 case R_386_TLS_GOTIE:
2048 case R_386_GOT32:
2049 if (h != NULL)
2050 {
2051 if (h->got.refcount > 0)
2052 h->got.refcount -= 1;
2053 if (h->type == STT_GNU_IFUNC)
2054 {
2055 if (h->plt.refcount > 0)
2056 h->plt.refcount -= 1;
2057 }
2058 }
2059 else if (local_got_refcounts != NULL)
2060 {
2061 if (local_got_refcounts[r_symndx] > 0)
2062 local_got_refcounts[r_symndx] -= 1;
2063 }
2064 break;
2065
2066 case R_386_32:
2067 case R_386_PC32:
2068 case R_386_SIZE32:
2069 if (info->shared
2070 && (h == NULL || h->type != STT_GNU_IFUNC))
2071 break;
2072 /* Fall through */
2073
2074 case R_386_PLT32:
2075 if (h != NULL)
2076 {
2077 if (h->plt.refcount > 0)
2078 h->plt.refcount -= 1;
2079 }
2080 break;
2081
2082 case R_386_GOTOFF:
2083 if (h != NULL && h->type == STT_GNU_IFUNC)
2084 {
2085 if (h->got.refcount > 0)
2086 h->got.refcount -= 1;
2087 if (h->plt.refcount > 0)
2088 h->plt.refcount -= 1;
2089 }
2090 break;
2091
2092 default:
2093 break;
2094 }
2095 }
2096
2097 return TRUE;
2098 }
2099
2100 /* Adjust a symbol defined by a dynamic object and referenced by a
2101 regular object. The current definition is in some section of the
2102 dynamic object, but we're not including those sections. We have to
2103 change the definition to something the rest of the link can
2104 understand. */
2105
2106 static bfd_boolean
2107 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2108 struct elf_link_hash_entry *h)
2109 {
2110 struct elf_i386_link_hash_table *htab;
2111 asection *s;
2112 struct elf_i386_link_hash_entry *eh;
2113 struct elf_dyn_relocs *p;
2114
2115 /* STT_GNU_IFUNC symbol must go through PLT. */
2116 if (h->type == STT_GNU_IFUNC)
2117 {
2118 /* All local STT_GNU_IFUNC references must be treate as local
2119 calls via local PLT. */
2120 if (h->ref_regular
2121 && SYMBOL_CALLS_LOCAL (info, h))
2122 {
2123 bfd_size_type pc_count = 0, count = 0;
2124 struct elf_dyn_relocs **pp;
2125
2126 eh = (struct elf_i386_link_hash_entry *) h;
2127 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2128 {
2129 pc_count += p->pc_count;
2130 p->count -= p->pc_count;
2131 p->pc_count = 0;
2132 count += p->count;
2133 if (p->count == 0)
2134 *pp = p->next;
2135 else
2136 pp = &p->next;
2137 }
2138
2139 if (pc_count || count)
2140 {
2141 h->needs_plt = 1;
2142 h->non_got_ref = 1;
2143 if (h->plt.refcount <= 0)
2144 h->plt.refcount = 1;
2145 else
2146 h->plt.refcount += 1;
2147 }
2148 }
2149
2150 if (h->plt.refcount <= 0)
2151 {
2152 h->plt.offset = (bfd_vma) -1;
2153 h->needs_plt = 0;
2154 }
2155 return TRUE;
2156 }
2157
2158 /* If this is a function, put it in the procedure linkage table. We
2159 will fill in the contents of the procedure linkage table later,
2160 when we know the address of the .got section. */
2161 if (h->type == STT_FUNC
2162 || h->needs_plt)
2163 {
2164 if (h->plt.refcount <= 0
2165 || SYMBOL_CALLS_LOCAL (info, h)
2166 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2167 && h->root.type == bfd_link_hash_undefweak))
2168 {
2169 /* This case can occur if we saw a PLT32 reloc in an input
2170 file, but the symbol was never referred to by a dynamic
2171 object, or if all references were garbage collected. In
2172 such a case, we don't actually need to build a procedure
2173 linkage table, and we can just do a PC32 reloc instead. */
2174 h->plt.offset = (bfd_vma) -1;
2175 h->needs_plt = 0;
2176 }
2177
2178 return TRUE;
2179 }
2180 else
2181 /* It's possible that we incorrectly decided a .plt reloc was
2182 needed for an R_386_PC32 reloc to a non-function sym in
2183 check_relocs. We can't decide accurately between function and
2184 non-function syms in check-relocs; Objects loaded later in
2185 the link may change h->type. So fix it now. */
2186 h->plt.offset = (bfd_vma) -1;
2187
2188 /* If this is a weak symbol, and there is a real definition, the
2189 processor independent code will have arranged for us to see the
2190 real definition first, and we can just use the same value. */
2191 if (h->u.weakdef != NULL)
2192 {
2193 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2194 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2195 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2196 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2197 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2198 h->non_got_ref = h->u.weakdef->non_got_ref;
2199 return TRUE;
2200 }
2201
2202 /* This is a reference to a symbol defined by a dynamic object which
2203 is not a function. */
2204
2205 /* If we are creating a shared library, we must presume that the
2206 only references to the symbol are via the global offset table.
2207 For such cases we need not do anything here; the relocations will
2208 be handled correctly by relocate_section. */
2209 if (!info->executable)
2210 return TRUE;
2211
2212 /* If there are no references to this symbol that do not use the
2213 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2214 reloc. */
2215 eh = (struct elf_i386_link_hash_entry *) h;
2216 if (!h->non_got_ref && !eh->gotoff_ref)
2217 return TRUE;
2218
2219 /* If -z nocopyreloc was given, we won't generate them either. */
2220 if (info->nocopyreloc)
2221 {
2222 h->non_got_ref = 0;
2223 return TRUE;
2224 }
2225
2226 htab = elf_i386_hash_table (info);
2227 if (htab == NULL)
2228 return FALSE;
2229
2230 /* If there aren't any dynamic relocs in read-only sections nor
2231 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2232 avoid the copy reloc. This doesn't work on VxWorks, where we can
2233 not have dynamic relocations (other than copy and jump slot
2234 relocations) in an executable. */
2235 if (ELIMINATE_COPY_RELOCS
2236 && !eh->gotoff_ref
2237 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2238 {
2239 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2240 {
2241 s = p->sec->output_section;
2242 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2243 break;
2244 }
2245
2246 if (p == NULL)
2247 {
2248 h->non_got_ref = 0;
2249 return TRUE;
2250 }
2251 }
2252
2253 /* We must allocate the symbol in our .dynbss section, which will
2254 become part of the .bss section of the executable. There will be
2255 an entry for this symbol in the .dynsym section. The dynamic
2256 object will contain position independent code, so all references
2257 from the dynamic object to this symbol will go through the global
2258 offset table. The dynamic linker will use the .dynsym entry to
2259 determine the address it must put in the global offset table, so
2260 both the dynamic object and the regular object will refer to the
2261 same memory location for the variable. */
2262
2263 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2264 copy the initial value out of the dynamic object and into the
2265 runtime process image. */
2266 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2267 {
2268 htab->srelbss->size += sizeof (Elf32_External_Rel);
2269 h->needs_copy = 1;
2270 }
2271
2272 s = htab->sdynbss;
2273
2274 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2275 }
2276
2277 /* Allocate space in .plt, .got and associated reloc sections for
2278 dynamic relocs. */
2279
2280 static bfd_boolean
2281 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2282 {
2283 struct bfd_link_info *info;
2284 struct elf_i386_link_hash_table *htab;
2285 struct elf_i386_link_hash_entry *eh;
2286 struct elf_dyn_relocs *p;
2287 unsigned plt_entry_size;
2288
2289 if (h->root.type == bfd_link_hash_indirect)
2290 return TRUE;
2291
2292 eh = (struct elf_i386_link_hash_entry *) h;
2293
2294 info = (struct bfd_link_info *) inf;
2295 htab = elf_i386_hash_table (info);
2296 if (htab == NULL)
2297 return FALSE;
2298
2299 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2300
2301 /* We can't use the GOT PLT if pointer equality is needed since
2302 finish_dynamic_symbol won't clear symbol value and the dynamic
2303 linker won't update the GOT slot. We will get into an infinite
2304 loop at run-time. */
2305 if (htab->plt_got != NULL
2306 && h->type != STT_GNU_IFUNC
2307 && !h->pointer_equality_needed
2308 && h->plt.refcount > 0
2309 && h->got.refcount > 0)
2310 {
2311 /* Don't use the regular PLT if there are both GOT and GOTPLT
2312 reloctions. */
2313 h->plt.offset = (bfd_vma) -1;
2314
2315 /* Use the GOT PLT. */
2316 eh->plt_got.refcount = 1;
2317 }
2318
2319 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2320 here if it is defined and referenced in a non-shared object. */
2321 if (h->type == STT_GNU_IFUNC
2322 && h->def_regular)
2323 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2324 plt_entry_size,
2325 plt_entry_size, 4);
2326 else if (htab->elf.dynamic_sections_created
2327 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2328 {
2329 bfd_boolean use_plt_got;
2330
2331 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2332 {
2333 /* Don't use the regular PLT for DF_BIND_NOW. */
2334 h->plt.offset = (bfd_vma) -1;
2335
2336 /* Use the GOT PLT. */
2337 h->got.refcount = 1;
2338 eh->plt_got.refcount = 1;
2339 }
2340
2341 use_plt_got = eh->plt_got.refcount > 0;
2342
2343 /* Make sure this symbol is output as a dynamic symbol.
2344 Undefined weak syms won't yet be marked as dynamic. */
2345 if (h->dynindx == -1
2346 && !h->forced_local)
2347 {
2348 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2349 return FALSE;
2350 }
2351
2352 if (info->shared
2353 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2354 {
2355 asection *s = htab->elf.splt;
2356 asection *got_s = htab->plt_got;
2357
2358 /* If this is the first .plt entry, make room for the special
2359 first entry. The .plt section is used by prelink to undo
2360 prelinking for dynamic relocations. */
2361 if (s->size == 0)
2362 s->size = plt_entry_size;
2363
2364 if (use_plt_got)
2365 eh->plt_got.offset = got_s->size;
2366 else
2367 h->plt.offset = s->size;
2368
2369 /* If this symbol is not defined in a regular file, and we are
2370 not generating a shared library, then set the symbol to this
2371 location in the .plt. This is required to make function
2372 pointers compare as equal between the normal executable and
2373 the shared library. */
2374 if (! info->shared
2375 && !h->def_regular)
2376 {
2377 if (use_plt_got)
2378 {
2379 /* We need to make a call to the entry of the GOT PLT
2380 instead of regular PLT entry. */
2381 h->root.u.def.section = got_s;
2382 h->root.u.def.value = eh->plt_got.offset;
2383 }
2384 else
2385 {
2386 h->root.u.def.section = s;
2387 h->root.u.def.value = h->plt.offset;
2388 }
2389 }
2390
2391 /* Make room for this entry. */
2392 if (use_plt_got)
2393 got_s->size += sizeof (elf_i386_got_plt_entry);
2394 else
2395 {
2396 s->size += plt_entry_size;
2397
2398 /* We also need to make an entry in the .got.plt section,
2399 which will be placed in the .got section by the linker
2400 script. */
2401 htab->elf.sgotplt->size += 4;
2402
2403 /* We also need to make an entry in the .rel.plt section. */
2404 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2405 htab->elf.srelplt->reloc_count++;
2406 }
2407
2408 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2409 && !info->shared)
2410 {
2411 /* VxWorks has a second set of relocations for each PLT entry
2412 in executables. They go in a separate relocation section,
2413 which is processed by the kernel loader. */
2414
2415 /* There are two relocations for the initial PLT entry: an
2416 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2417 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2418
2419 if (h->plt.offset == plt_entry_size)
2420 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2421
2422 /* There are two extra relocations for each subsequent PLT entry:
2423 an R_386_32 relocation for the GOT entry, and an R_386_32
2424 relocation for the PLT entry. */
2425
2426 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2427 }
2428 }
2429 else
2430 {
2431 h->plt.offset = (bfd_vma) -1;
2432 h->needs_plt = 0;
2433 }
2434 }
2435 else
2436 {
2437 h->plt.offset = (bfd_vma) -1;
2438 h->needs_plt = 0;
2439 }
2440
2441 eh->tlsdesc_got = (bfd_vma) -1;
2442
2443 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2444 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2445 if (h->got.refcount > 0
2446 && info->executable
2447 && h->dynindx == -1
2448 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2449 h->got.offset = (bfd_vma) -1;
2450 else if (h->got.refcount > 0)
2451 {
2452 asection *s;
2453 bfd_boolean dyn;
2454 int tls_type = elf_i386_hash_entry(h)->tls_type;
2455
2456 /* Make sure this symbol is output as a dynamic symbol.
2457 Undefined weak syms won't yet be marked as dynamic. */
2458 if (h->dynindx == -1
2459 && !h->forced_local)
2460 {
2461 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2462 return FALSE;
2463 }
2464
2465 s = htab->elf.sgot;
2466 if (GOT_TLS_GDESC_P (tls_type))
2467 {
2468 eh->tlsdesc_got = htab->elf.sgotplt->size
2469 - elf_i386_compute_jump_table_size (htab);
2470 htab->elf.sgotplt->size += 8;
2471 h->got.offset = (bfd_vma) -2;
2472 }
2473 if (! GOT_TLS_GDESC_P (tls_type)
2474 || GOT_TLS_GD_P (tls_type))
2475 {
2476 h->got.offset = s->size;
2477 s->size += 4;
2478 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2479 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2480 s->size += 4;
2481 }
2482 dyn = htab->elf.dynamic_sections_created;
2483 /* R_386_TLS_IE_32 needs one dynamic relocation,
2484 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2485 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2486 need two), R_386_TLS_GD needs one if local symbol and two if
2487 global. */
2488 if (tls_type == GOT_TLS_IE_BOTH)
2489 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2490 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2491 || (tls_type & GOT_TLS_IE))
2492 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2493 else if (GOT_TLS_GD_P (tls_type))
2494 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2495 else if (! GOT_TLS_GDESC_P (tls_type)
2496 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2497 || h->root.type != bfd_link_hash_undefweak)
2498 && (info->shared
2499 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2500 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2501 if (GOT_TLS_GDESC_P (tls_type))
2502 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2503 }
2504 else
2505 h->got.offset = (bfd_vma) -1;
2506
2507 if (eh->dyn_relocs == NULL)
2508 return TRUE;
2509
2510 /* In the shared -Bsymbolic case, discard space allocated for
2511 dynamic pc-relative relocs against symbols which turn out to be
2512 defined in regular objects. For the normal shared case, discard
2513 space for pc-relative relocs that have become local due to symbol
2514 visibility changes. */
2515
2516 if (info->shared)
2517 {
2518 /* The only reloc that uses pc_count is R_386_PC32, which will
2519 appear on a call or on something like ".long foo - .". We
2520 want calls to protected symbols to resolve directly to the
2521 function rather than going via the plt. If people want
2522 function pointer comparisons to work as expected then they
2523 should avoid writing assembly like ".long foo - .". */
2524 if (SYMBOL_CALLS_LOCAL (info, h))
2525 {
2526 struct elf_dyn_relocs **pp;
2527
2528 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2529 {
2530 p->count -= p->pc_count;
2531 p->pc_count = 0;
2532 if (p->count == 0)
2533 *pp = p->next;
2534 else
2535 pp = &p->next;
2536 }
2537 }
2538
2539 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2540 {
2541 struct elf_dyn_relocs **pp;
2542 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2543 {
2544 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2545 *pp = p->next;
2546 else
2547 pp = &p->next;
2548 }
2549 }
2550
2551 /* Also discard relocs on undefined weak syms with non-default
2552 visibility. */
2553 if (eh->dyn_relocs != NULL
2554 && h->root.type == bfd_link_hash_undefweak)
2555 {
2556 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2557 eh->dyn_relocs = NULL;
2558
2559 /* Make sure undefined weak symbols are output as a dynamic
2560 symbol in PIEs. */
2561 else if (h->dynindx == -1
2562 && !h->forced_local)
2563 {
2564 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2565 return FALSE;
2566 }
2567 }
2568 }
2569 else if (ELIMINATE_COPY_RELOCS)
2570 {
2571 /* For the non-shared case, discard space for relocs against
2572 symbols which turn out to need copy relocs or are not
2573 dynamic. */
2574
2575 if (!h->non_got_ref
2576 && ((h->def_dynamic
2577 && !h->def_regular)
2578 || (htab->elf.dynamic_sections_created
2579 && (h->root.type == bfd_link_hash_undefweak
2580 || h->root.type == bfd_link_hash_undefined))))
2581 {
2582 /* Make sure this symbol is output as a dynamic symbol.
2583 Undefined weak syms won't yet be marked as dynamic. */
2584 if (h->dynindx == -1
2585 && !h->forced_local)
2586 {
2587 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2588 return FALSE;
2589 }
2590
2591 /* If that succeeded, we know we'll be keeping all the
2592 relocs. */
2593 if (h->dynindx != -1)
2594 goto keep;
2595 }
2596
2597 eh->dyn_relocs = NULL;
2598
2599 keep: ;
2600 }
2601
2602 /* Finally, allocate space. */
2603 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2604 {
2605 asection *sreloc;
2606
2607 sreloc = elf_section_data (p->sec)->sreloc;
2608
2609 BFD_ASSERT (sreloc != NULL);
2610 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2611 }
2612
2613 return TRUE;
2614 }
2615
2616 /* Allocate space in .plt, .got and associated reloc sections for
2617 local dynamic relocs. */
2618
2619 static bfd_boolean
2620 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2621 {
2622 struct elf_link_hash_entry *h
2623 = (struct elf_link_hash_entry *) *slot;
2624
2625 if (h->type != STT_GNU_IFUNC
2626 || !h->def_regular
2627 || !h->ref_regular
2628 || !h->forced_local
2629 || h->root.type != bfd_link_hash_defined)
2630 abort ();
2631
2632 return elf_i386_allocate_dynrelocs (h, inf);
2633 }
2634
2635 /* Find any dynamic relocs that apply to read-only sections. */
2636
2637 static bfd_boolean
2638 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2639 {
2640 struct elf_i386_link_hash_entry *eh;
2641 struct elf_dyn_relocs *p;
2642
2643 /* Skip local IFUNC symbols. */
2644 if (h->forced_local && h->type == STT_GNU_IFUNC)
2645 return TRUE;
2646
2647 eh = (struct elf_i386_link_hash_entry *) h;
2648 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2649 {
2650 asection *s = p->sec->output_section;
2651
2652 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2653 {
2654 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2655
2656 info->flags |= DF_TEXTREL;
2657
2658 if ((info->warn_shared_textrel && info->shared)
2659 || info->error_textrel)
2660 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2661 p->sec->owner, h->root.root.string,
2662 p->sec);
2663
2664 /* Not an error, just cut short the traversal. */
2665 return FALSE;
2666 }
2667 }
2668 return TRUE;
2669 }
2670
2671 /* Convert
2672 mov foo@GOT(%reg), %reg
2673 to
2674 lea foo@GOTOFF(%reg), %reg
2675 with the local symbol, foo. */
2676
2677 static bfd_boolean
2678 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2679 struct bfd_link_info *link_info)
2680 {
2681 Elf_Internal_Shdr *symtab_hdr;
2682 Elf_Internal_Rela *internal_relocs;
2683 Elf_Internal_Rela *irel, *irelend;
2684 bfd_byte *contents;
2685 struct elf_i386_link_hash_table *htab;
2686 bfd_boolean changed_contents;
2687 bfd_boolean changed_relocs;
2688 bfd_signed_vma *local_got_refcounts;
2689
2690 /* Don't even try to convert non-ELF outputs. */
2691 if (!is_elf_hash_table (link_info->hash))
2692 return FALSE;
2693
2694 /* Nothing to do if there is no need or no output. */
2695 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2696 || sec->need_convert_mov_to_lea == 0
2697 || bfd_is_abs_section (sec->output_section))
2698 return TRUE;
2699
2700 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2701
2702 /* Load the relocations for this section. */
2703 internal_relocs = (_bfd_elf_link_read_relocs
2704 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2705 link_info->keep_memory));
2706 if (internal_relocs == NULL)
2707 return FALSE;
2708
2709 htab = elf_i386_hash_table (link_info);
2710 changed_contents = FALSE;
2711 changed_relocs = FALSE;
2712 local_got_refcounts = elf_local_got_refcounts (abfd);
2713
2714 /* Get the section contents. */
2715 if (elf_section_data (sec)->this_hdr.contents != NULL)
2716 contents = elf_section_data (sec)->this_hdr.contents;
2717 else
2718 {
2719 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2720 goto error_return;
2721 }
2722
2723 irelend = internal_relocs + sec->reloc_count;
2724 for (irel = internal_relocs; irel < irelend; irel++)
2725 {
2726 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2727 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2728 unsigned int indx;
2729 struct elf_link_hash_entry *h;
2730
2731 if (r_type != R_386_GOT32)
2732 continue;
2733
2734 /* Get the symbol referred to by the reloc. */
2735 if (r_symndx < symtab_hdr->sh_info)
2736 {
2737 Elf_Internal_Sym *isym;
2738
2739 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2740 abfd, r_symndx);
2741
2742 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2743 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2744 && irel->r_offset >= 2
2745 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2746 {
2747 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2748 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2749 if (local_got_refcounts != NULL
2750 && local_got_refcounts[r_symndx] > 0)
2751 local_got_refcounts[r_symndx] -= 1;
2752 changed_contents = TRUE;
2753 changed_relocs = TRUE;
2754 }
2755 continue;
2756 }
2757
2758 indx = r_symndx - symtab_hdr->sh_info;
2759 h = elf_sym_hashes (abfd)[indx];
2760 BFD_ASSERT (h != NULL);
2761
2762 while (h->root.type == bfd_link_hash_indirect
2763 || h->root.type == bfd_link_hash_warning)
2764 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2765
2766 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2767 optimizing _DYNAMIC since ld.so may use its link-time address. */
2768 if (h->def_regular
2769 && h->type != STT_GNU_IFUNC
2770 && h != htab->elf.hdynamic
2771 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2772 && irel->r_offset >= 2
2773 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2774 {
2775 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2776 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2777 if (h->got.refcount > 0)
2778 h->got.refcount -= 1;
2779 changed_contents = TRUE;
2780 changed_relocs = TRUE;
2781 }
2782 }
2783
2784 if (contents != NULL
2785 && elf_section_data (sec)->this_hdr.contents != contents)
2786 {
2787 if (!changed_contents && !link_info->keep_memory)
2788 free (contents);
2789 else
2790 {
2791 /* Cache the section contents for elf_link_input_bfd. */
2792 elf_section_data (sec)->this_hdr.contents = contents;
2793 }
2794 }
2795
2796 if (elf_section_data (sec)->relocs != internal_relocs)
2797 {
2798 if (!changed_relocs)
2799 free (internal_relocs);
2800 else
2801 elf_section_data (sec)->relocs = internal_relocs;
2802 }
2803
2804 return TRUE;
2805
2806 error_return:
2807 if (contents != NULL
2808 && elf_section_data (sec)->this_hdr.contents != contents)
2809 free (contents);
2810 if (internal_relocs != NULL
2811 && elf_section_data (sec)->relocs != internal_relocs)
2812 free (internal_relocs);
2813 return FALSE;
2814 }
2815
2816 /* Set the sizes of the dynamic sections. */
2817
2818 static bfd_boolean
2819 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2820 {
2821 struct elf_i386_link_hash_table *htab;
2822 bfd *dynobj;
2823 asection *s;
2824 bfd_boolean relocs;
2825 bfd *ibfd;
2826
2827 htab = elf_i386_hash_table (info);
2828 if (htab == NULL)
2829 return FALSE;
2830 dynobj = htab->elf.dynobj;
2831 if (dynobj == NULL)
2832 abort ();
2833
2834 if (htab->elf.dynamic_sections_created)
2835 {
2836 /* Set the contents of the .interp section to the interpreter. */
2837 if (info->executable)
2838 {
2839 s = bfd_get_linker_section (dynobj, ".interp");
2840 if (s == NULL)
2841 abort ();
2842 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2843 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2844 }
2845 }
2846
2847 /* Set up .got offsets for local syms, and space for local dynamic
2848 relocs. */
2849 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2850 {
2851 bfd_signed_vma *local_got;
2852 bfd_signed_vma *end_local_got;
2853 char *local_tls_type;
2854 bfd_vma *local_tlsdesc_gotent;
2855 bfd_size_type locsymcount;
2856 Elf_Internal_Shdr *symtab_hdr;
2857 asection *srel;
2858
2859 if (! is_i386_elf (ibfd))
2860 continue;
2861
2862 for (s = ibfd->sections; s != NULL; s = s->next)
2863 {
2864 struct elf_dyn_relocs *p;
2865
2866 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2867 return FALSE;
2868
2869 for (p = ((struct elf_dyn_relocs *)
2870 elf_section_data (s)->local_dynrel);
2871 p != NULL;
2872 p = p->next)
2873 {
2874 if (!bfd_is_abs_section (p->sec)
2875 && bfd_is_abs_section (p->sec->output_section))
2876 {
2877 /* Input section has been discarded, either because
2878 it is a copy of a linkonce section or due to
2879 linker script /DISCARD/, so we'll be discarding
2880 the relocs too. */
2881 }
2882 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2883 && strcmp (p->sec->output_section->name,
2884 ".tls_vars") == 0)
2885 {
2886 /* Relocations in vxworks .tls_vars sections are
2887 handled specially by the loader. */
2888 }
2889 else if (p->count != 0)
2890 {
2891 srel = elf_section_data (p->sec)->sreloc;
2892 srel->size += p->count * sizeof (Elf32_External_Rel);
2893 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2894 && (info->flags & DF_TEXTREL) == 0)
2895 {
2896 info->flags |= DF_TEXTREL;
2897 if ((info->warn_shared_textrel && info->shared)
2898 || info->error_textrel)
2899 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2900 p->sec->owner, p->sec);
2901 }
2902 }
2903 }
2904 }
2905
2906 local_got = elf_local_got_refcounts (ibfd);
2907 if (!local_got)
2908 continue;
2909
2910 symtab_hdr = &elf_symtab_hdr (ibfd);
2911 locsymcount = symtab_hdr->sh_info;
2912 end_local_got = local_got + locsymcount;
2913 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2914 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2915 s = htab->elf.sgot;
2916 srel = htab->elf.srelgot;
2917 for (; local_got < end_local_got;
2918 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2919 {
2920 *local_tlsdesc_gotent = (bfd_vma) -1;
2921 if (*local_got > 0)
2922 {
2923 if (GOT_TLS_GDESC_P (*local_tls_type))
2924 {
2925 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2926 - elf_i386_compute_jump_table_size (htab);
2927 htab->elf.sgotplt->size += 8;
2928 *local_got = (bfd_vma) -2;
2929 }
2930 if (! GOT_TLS_GDESC_P (*local_tls_type)
2931 || GOT_TLS_GD_P (*local_tls_type))
2932 {
2933 *local_got = s->size;
2934 s->size += 4;
2935 if (GOT_TLS_GD_P (*local_tls_type)
2936 || *local_tls_type == GOT_TLS_IE_BOTH)
2937 s->size += 4;
2938 }
2939 if (info->shared
2940 || GOT_TLS_GD_ANY_P (*local_tls_type)
2941 || (*local_tls_type & GOT_TLS_IE))
2942 {
2943 if (*local_tls_type == GOT_TLS_IE_BOTH)
2944 srel->size += 2 * sizeof (Elf32_External_Rel);
2945 else if (GOT_TLS_GD_P (*local_tls_type)
2946 || ! GOT_TLS_GDESC_P (*local_tls_type))
2947 srel->size += sizeof (Elf32_External_Rel);
2948 if (GOT_TLS_GDESC_P (*local_tls_type))
2949 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2950 }
2951 }
2952 else
2953 *local_got = (bfd_vma) -1;
2954 }
2955 }
2956
2957 if (htab->tls_ldm_got.refcount > 0)
2958 {
2959 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2960 relocs. */
2961 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2962 htab->elf.sgot->size += 8;
2963 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2964 }
2965 else
2966 htab->tls_ldm_got.offset = -1;
2967
2968 /* Allocate global sym .plt and .got entries, and space for global
2969 sym dynamic relocs. */
2970 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2971
2972 /* Allocate .plt and .got entries, and space for local symbols. */
2973 htab_traverse (htab->loc_hash_table,
2974 elf_i386_allocate_local_dynrelocs,
2975 info);
2976
2977 /* For every jump slot reserved in the sgotplt, reloc_count is
2978 incremented. However, when we reserve space for TLS descriptors,
2979 it's not incremented, so in order to compute the space reserved
2980 for them, it suffices to multiply the reloc count by the jump
2981 slot size.
2982
2983 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2984 so that R_386_IRELATIVE entries come last. */
2985 if (htab->elf.srelplt)
2986 {
2987 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2988 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2989 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2990 }
2991 else if (htab->elf.irelplt)
2992 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2993
2994
2995 if (htab->elf.sgotplt)
2996 {
2997 /* Don't allocate .got.plt section if there are no GOT nor PLT
2998 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2999 if ((htab->elf.hgot == NULL
3000 || !htab->elf.hgot->ref_regular_nonweak)
3001 && (htab->elf.sgotplt->size
3002 == get_elf_backend_data (output_bfd)->got_header_size)
3003 && (htab->elf.splt == NULL
3004 || htab->elf.splt->size == 0)
3005 && (htab->elf.sgot == NULL
3006 || htab->elf.sgot->size == 0)
3007 && (htab->elf.iplt == NULL
3008 || htab->elf.iplt->size == 0)
3009 && (htab->elf.igotplt == NULL
3010 || htab->elf.igotplt->size == 0))
3011 htab->elf.sgotplt->size = 0;
3012 }
3013
3014
3015 if (htab->plt_eh_frame != NULL
3016 && htab->elf.splt != NULL
3017 && htab->elf.splt->size != 0
3018 && !bfd_is_abs_section (htab->elf.splt->output_section)
3019 && _bfd_elf_eh_frame_present (info))
3020 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3021
3022 /* We now have determined the sizes of the various dynamic sections.
3023 Allocate memory for them. */
3024 relocs = FALSE;
3025 for (s = dynobj->sections; s != NULL; s = s->next)
3026 {
3027 bfd_boolean strip_section = TRUE;
3028
3029 if ((s->flags & SEC_LINKER_CREATED) == 0)
3030 continue;
3031
3032 if (s == htab->elf.splt
3033 || s == htab->elf.sgot)
3034 {
3035 /* Strip this section if we don't need it; see the
3036 comment below. */
3037 /* We'd like to strip these sections if they aren't needed, but if
3038 we've exported dynamic symbols from them we must leave them.
3039 It's too late to tell BFD to get rid of the symbols. */
3040
3041 if (htab->elf.hplt != NULL)
3042 strip_section = FALSE;
3043 }
3044 else if (s == htab->elf.sgotplt
3045 || s == htab->elf.iplt
3046 || s == htab->elf.igotplt
3047 || s == htab->plt_got
3048 || s == htab->plt_eh_frame
3049 || s == htab->sdynbss)
3050 {
3051 /* Strip these too. */
3052 }
3053 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3054 {
3055 if (s->size != 0
3056 && s != htab->elf.srelplt
3057 && s != htab->srelplt2)
3058 relocs = TRUE;
3059
3060 /* We use the reloc_count field as a counter if we need
3061 to copy relocs into the output file. */
3062 s->reloc_count = 0;
3063 }
3064 else
3065 {
3066 /* It's not one of our sections, so don't allocate space. */
3067 continue;
3068 }
3069
3070 if (s->size == 0)
3071 {
3072 /* If we don't need this section, strip it from the
3073 output file. This is mostly to handle .rel.bss and
3074 .rel.plt. We must create both sections in
3075 create_dynamic_sections, because they must be created
3076 before the linker maps input sections to output
3077 sections. The linker does that before
3078 adjust_dynamic_symbol is called, and it is that
3079 function which decides whether anything needs to go
3080 into these sections. */
3081 if (strip_section)
3082 s->flags |= SEC_EXCLUDE;
3083 continue;
3084 }
3085
3086 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3087 continue;
3088
3089 /* Allocate memory for the section contents. We use bfd_zalloc
3090 here in case unused entries are not reclaimed before the
3091 section's contents are written out. This should not happen,
3092 but this way if it does, we get a R_386_NONE reloc instead
3093 of garbage. */
3094 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3095 if (s->contents == NULL)
3096 return FALSE;
3097 }
3098
3099 if (htab->plt_eh_frame != NULL
3100 && htab->plt_eh_frame->contents != NULL)
3101 {
3102 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3103 sizeof (elf_i386_eh_frame_plt));
3104 bfd_put_32 (dynobj, htab->elf.splt->size,
3105 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3106 }
3107
3108 if (htab->elf.dynamic_sections_created)
3109 {
3110 /* Add some entries to the .dynamic section. We fill in the
3111 values later, in elf_i386_finish_dynamic_sections, but we
3112 must add the entries now so that we get the correct size for
3113 the .dynamic section. The DT_DEBUG entry is filled in by the
3114 dynamic linker and used by the debugger. */
3115 #define add_dynamic_entry(TAG, VAL) \
3116 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3117
3118 if (info->executable)
3119 {
3120 if (!add_dynamic_entry (DT_DEBUG, 0))
3121 return FALSE;
3122 }
3123
3124 if (htab->elf.splt->size != 0)
3125 {
3126 /* DT_PLTGOT is used by prelink even if there is no PLT
3127 relocation. */
3128 if (!add_dynamic_entry (DT_PLTGOT, 0))
3129 return FALSE;
3130
3131 if (htab->elf.srelplt->size != 0)
3132 {
3133 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3134 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3135 || !add_dynamic_entry (DT_JMPREL, 0))
3136 return FALSE;
3137 }
3138 }
3139
3140 if (relocs)
3141 {
3142 if (!add_dynamic_entry (DT_REL, 0)
3143 || !add_dynamic_entry (DT_RELSZ, 0)
3144 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3145 return FALSE;
3146
3147 /* If any dynamic relocs apply to a read-only section,
3148 then we need a DT_TEXTREL entry. */
3149 if ((info->flags & DF_TEXTREL) == 0)
3150 elf_link_hash_traverse (&htab->elf,
3151 elf_i386_readonly_dynrelocs, info);
3152
3153 if ((info->flags & DF_TEXTREL) != 0)
3154 {
3155 if (!add_dynamic_entry (DT_TEXTREL, 0))
3156 return FALSE;
3157 }
3158 }
3159 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3160 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3161 return FALSE;
3162 }
3163 #undef add_dynamic_entry
3164
3165 return TRUE;
3166 }
3167
3168 static bfd_boolean
3169 elf_i386_always_size_sections (bfd *output_bfd,
3170 struct bfd_link_info *info)
3171 {
3172 asection *tls_sec = elf_hash_table (info)->tls_sec;
3173
3174 if (tls_sec)
3175 {
3176 struct elf_link_hash_entry *tlsbase;
3177
3178 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3179 "_TLS_MODULE_BASE_",
3180 FALSE, FALSE, FALSE);
3181
3182 if (tlsbase && tlsbase->type == STT_TLS)
3183 {
3184 struct elf_i386_link_hash_table *htab;
3185 struct bfd_link_hash_entry *bh = NULL;
3186 const struct elf_backend_data *bed
3187 = get_elf_backend_data (output_bfd);
3188
3189 htab = elf_i386_hash_table (info);
3190 if (htab == NULL)
3191 return FALSE;
3192
3193 if (!(_bfd_generic_link_add_one_symbol
3194 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3195 tls_sec, 0, NULL, FALSE,
3196 bed->collect, &bh)))
3197 return FALSE;
3198
3199 htab->tls_module_base = bh;
3200
3201 tlsbase = (struct elf_link_hash_entry *)bh;
3202 tlsbase->def_regular = 1;
3203 tlsbase->other = STV_HIDDEN;
3204 tlsbase->root.linker_def = 1;
3205 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3206 }
3207 }
3208
3209 return TRUE;
3210 }
3211
3212 /* Set the correct type for an x86 ELF section. We do this by the
3213 section name, which is a hack, but ought to work. */
3214
3215 static bfd_boolean
3216 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3217 Elf_Internal_Shdr *hdr,
3218 asection *sec)
3219 {
3220 const char *name;
3221
3222 name = bfd_get_section_name (abfd, sec);
3223
3224 /* This is an ugly, but unfortunately necessary hack that is
3225 needed when producing EFI binaries on x86. It tells
3226 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3227 containing ELF relocation info. We need this hack in order to
3228 be able to generate ELF binaries that can be translated into
3229 EFI applications (which are essentially COFF objects). Those
3230 files contain a COFF ".reloc" section inside an ELFNN object,
3231 which would normally cause BFD to segfault because it would
3232 attempt to interpret this section as containing relocation
3233 entries for section "oc". With this hack enabled, ".reloc"
3234 will be treated as a normal data section, which will avoid the
3235 segfault. However, you won't be able to create an ELFNN binary
3236 with a section named "oc" that needs relocations, but that's
3237 the kind of ugly side-effects you get when detecting section
3238 types based on their names... In practice, this limitation is
3239 unlikely to bite. */
3240 if (strcmp (name, ".reloc") == 0)
3241 hdr->sh_type = SHT_PROGBITS;
3242
3243 return TRUE;
3244 }
3245
3246 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3247 executables. Rather than setting it to the beginning of the TLS
3248 section, we have to set it to the end. This function may be called
3249 multiple times, it is idempotent. */
3250
3251 static void
3252 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3253 {
3254 struct elf_i386_link_hash_table *htab;
3255 struct bfd_link_hash_entry *base;
3256
3257 if (!info->executable)
3258 return;
3259
3260 htab = elf_i386_hash_table (info);
3261 if (htab == NULL)
3262 return;
3263
3264 base = htab->tls_module_base;
3265 if (base == NULL)
3266 return;
3267
3268 base->u.def.value = htab->elf.tls_size;
3269 }
3270
3271 /* Return the base VMA address which should be subtracted from real addresses
3272 when resolving @dtpoff relocation.
3273 This is PT_TLS segment p_vaddr. */
3274
3275 static bfd_vma
3276 elf_i386_dtpoff_base (struct bfd_link_info *info)
3277 {
3278 /* If tls_sec is NULL, we should have signalled an error already. */
3279 if (elf_hash_table (info)->tls_sec == NULL)
3280 return 0;
3281 return elf_hash_table (info)->tls_sec->vma;
3282 }
3283
3284 /* Return the relocation value for @tpoff relocation
3285 if STT_TLS virtual address is ADDRESS. */
3286
3287 static bfd_vma
3288 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3289 {
3290 struct elf_link_hash_table *htab = elf_hash_table (info);
3291 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3292 bfd_vma static_tls_size;
3293
3294 /* If tls_sec is NULL, we should have signalled an error already. */
3295 if (htab->tls_sec == NULL)
3296 return 0;
3297
3298 /* Consider special static TLS alignment requirements. */
3299 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3300 return static_tls_size + htab->tls_sec->vma - address;
3301 }
3302
3303 /* Relocate an i386 ELF section. */
3304
3305 static bfd_boolean
3306 elf_i386_relocate_section (bfd *output_bfd,
3307 struct bfd_link_info *info,
3308 bfd *input_bfd,
3309 asection *input_section,
3310 bfd_byte *contents,
3311 Elf_Internal_Rela *relocs,
3312 Elf_Internal_Sym *local_syms,
3313 asection **local_sections)
3314 {
3315 struct elf_i386_link_hash_table *htab;
3316 Elf_Internal_Shdr *symtab_hdr;
3317 struct elf_link_hash_entry **sym_hashes;
3318 bfd_vma *local_got_offsets;
3319 bfd_vma *local_tlsdesc_gotents;
3320 Elf_Internal_Rela *rel;
3321 Elf_Internal_Rela *relend;
3322 bfd_boolean is_vxworks_tls;
3323 unsigned plt_entry_size;
3324
3325 BFD_ASSERT (is_i386_elf (input_bfd));
3326
3327 htab = elf_i386_hash_table (info);
3328 if (htab == NULL)
3329 return FALSE;
3330 symtab_hdr = &elf_symtab_hdr (input_bfd);
3331 sym_hashes = elf_sym_hashes (input_bfd);
3332 local_got_offsets = elf_local_got_offsets (input_bfd);
3333 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3334 /* We have to handle relocations in vxworks .tls_vars sections
3335 specially, because the dynamic loader is 'weird'. */
3336 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3337 && info->shared
3338 && !strcmp (input_section->output_section->name,
3339 ".tls_vars"));
3340
3341 elf_i386_set_tls_module_base (info);
3342
3343 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3344
3345 rel = relocs;
3346 relend = relocs + input_section->reloc_count;
3347 for (; rel < relend; rel++)
3348 {
3349 unsigned int r_type;
3350 reloc_howto_type *howto;
3351 unsigned long r_symndx;
3352 struct elf_link_hash_entry *h;
3353 struct elf_i386_link_hash_entry *eh;
3354 Elf_Internal_Sym *sym;
3355 asection *sec;
3356 bfd_vma off, offplt, plt_offset;
3357 bfd_vma relocation;
3358 bfd_boolean unresolved_reloc;
3359 bfd_reloc_status_type r;
3360 unsigned int indx;
3361 int tls_type;
3362 bfd_vma st_size;
3363 asection *resolved_plt;
3364
3365 r_type = ELF32_R_TYPE (rel->r_info);
3366 if (r_type == R_386_GNU_VTINHERIT
3367 || r_type == R_386_GNU_VTENTRY)
3368 continue;
3369
3370 if ((indx = r_type) >= R_386_standard
3371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3372 >= R_386_ext - R_386_standard)
3373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3374 >= R_386_irelative - R_386_ext))
3375 {
3376 (*_bfd_error_handler)
3377 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3378 input_bfd, input_section, r_type);
3379 bfd_set_error (bfd_error_bad_value);
3380 return FALSE;
3381 }
3382 howto = elf_howto_table + indx;
3383
3384 r_symndx = ELF32_R_SYM (rel->r_info);
3385 h = NULL;
3386 sym = NULL;
3387 sec = NULL;
3388 unresolved_reloc = FALSE;
3389 if (r_symndx < symtab_hdr->sh_info)
3390 {
3391 sym = local_syms + r_symndx;
3392 sec = local_sections[r_symndx];
3393 relocation = (sec->output_section->vma
3394 + sec->output_offset
3395 + sym->st_value);
3396 st_size = sym->st_size;
3397
3398 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3399 && ((sec->flags & SEC_MERGE) != 0
3400 || (info->relocatable
3401 && sec->output_offset != 0)))
3402 {
3403 bfd_vma addend;
3404 bfd_byte *where = contents + rel->r_offset;
3405
3406 switch (howto->size)
3407 {
3408 case 0:
3409 addend = bfd_get_8 (input_bfd, where);
3410 if (howto->pc_relative)
3411 {
3412 addend = (addend ^ 0x80) - 0x80;
3413 addend += 1;
3414 }
3415 break;
3416 case 1:
3417 addend = bfd_get_16 (input_bfd, where);
3418 if (howto->pc_relative)
3419 {
3420 addend = (addend ^ 0x8000) - 0x8000;
3421 addend += 2;
3422 }
3423 break;
3424 case 2:
3425 addend = bfd_get_32 (input_bfd, where);
3426 if (howto->pc_relative)
3427 {
3428 addend = (addend ^ 0x80000000) - 0x80000000;
3429 addend += 4;
3430 }
3431 break;
3432 default:
3433 abort ();
3434 }
3435
3436 if (info->relocatable)
3437 addend += sec->output_offset;
3438 else
3439 {
3440 asection *msec = sec;
3441 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3442 addend);
3443 addend -= relocation;
3444 addend += msec->output_section->vma + msec->output_offset;
3445 }
3446
3447 switch (howto->size)
3448 {
3449 case 0:
3450 /* FIXME: overflow checks. */
3451 if (howto->pc_relative)
3452 addend -= 1;
3453 bfd_put_8 (input_bfd, addend, where);
3454 break;
3455 case 1:
3456 if (howto->pc_relative)
3457 addend -= 2;
3458 bfd_put_16 (input_bfd, addend, where);
3459 break;
3460 case 2:
3461 if (howto->pc_relative)
3462 addend -= 4;
3463 bfd_put_32 (input_bfd, addend, where);
3464 break;
3465 }
3466 }
3467 else if (!info->relocatable
3468 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3469 {
3470 /* Relocate against local STT_GNU_IFUNC symbol. */
3471 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3472 FALSE);
3473 if (h == NULL)
3474 abort ();
3475
3476 /* Set STT_GNU_IFUNC symbol value. */
3477 h->root.u.def.value = sym->st_value;
3478 h->root.u.def.section = sec;
3479 }
3480 }
3481 else
3482 {
3483 bfd_boolean warned ATTRIBUTE_UNUSED;
3484 bfd_boolean ignored ATTRIBUTE_UNUSED;
3485
3486 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3487 r_symndx, symtab_hdr, sym_hashes,
3488 h, sec, relocation,
3489 unresolved_reloc, warned, ignored);
3490 st_size = h->size;
3491 }
3492
3493 if (sec != NULL && discarded_section (sec))
3494 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3495 rel, 1, relend, howto, 0, contents);
3496
3497 if (info->relocatable)
3498 continue;
3499
3500 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3501 it here if it is defined in a non-shared object. */
3502 if (h != NULL
3503 && h->type == STT_GNU_IFUNC
3504 && h->def_regular)
3505 {
3506 asection *plt, *gotplt, *base_got;
3507 bfd_vma plt_index;
3508 const char *name;
3509
3510 if ((input_section->flags & SEC_ALLOC) == 0)
3511 {
3512 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3513 sections because such sections are not SEC_ALLOC and
3514 thus ld.so will not process them. */
3515 if ((input_section->flags & SEC_DEBUGGING) != 0)
3516 continue;
3517 abort ();
3518 }
3519 else if (h->plt.offset == (bfd_vma) -1)
3520 abort ();
3521
3522 /* STT_GNU_IFUNC symbol must go through PLT. */
3523 if (htab->elf.splt != NULL)
3524 {
3525 plt = htab->elf.splt;
3526 gotplt = htab->elf.sgotplt;
3527 }
3528 else
3529 {
3530 plt = htab->elf.iplt;
3531 gotplt = htab->elf.igotplt;
3532 }
3533
3534 relocation = (plt->output_section->vma
3535 + plt->output_offset + h->plt.offset);
3536
3537 switch (r_type)
3538 {
3539 default:
3540 if (h->root.root.string)
3541 name = h->root.root.string;
3542 else
3543 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3544 NULL);
3545 (*_bfd_error_handler)
3546 (_("%B: relocation %s against STT_GNU_IFUNC "
3547 "symbol `%s' isn't handled by %s"), input_bfd,
3548 elf_howto_table[r_type].name,
3549 name, __FUNCTION__);
3550 bfd_set_error (bfd_error_bad_value);
3551 return FALSE;
3552
3553 case R_386_32:
3554 /* Generate dynamic relcoation only when there is a
3555 non-GOT reference in a shared object. */
3556 if (info->shared && h->non_got_ref)
3557 {
3558 Elf_Internal_Rela outrel;
3559 asection *sreloc;
3560 bfd_vma offset;
3561
3562 /* Need a dynamic relocation to get the real function
3563 adddress. */
3564 offset = _bfd_elf_section_offset (output_bfd,
3565 info,
3566 input_section,
3567 rel->r_offset);
3568 if (offset == (bfd_vma) -1
3569 || offset == (bfd_vma) -2)
3570 abort ();
3571
3572 outrel.r_offset = (input_section->output_section->vma
3573 + input_section->output_offset
3574 + offset);
3575
3576 if (h->dynindx == -1
3577 || h->forced_local
3578 || info->executable)
3579 {
3580 /* This symbol is resolved locally. */
3581 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3582 bfd_put_32 (output_bfd,
3583 (h->root.u.def.value
3584 + h->root.u.def.section->output_section->vma
3585 + h->root.u.def.section->output_offset),
3586 contents + offset);
3587 }
3588 else
3589 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3590
3591 sreloc = htab->elf.irelifunc;
3592 elf_append_rel (output_bfd, sreloc, &outrel);
3593
3594 /* If this reloc is against an external symbol, we
3595 do not want to fiddle with the addend. Otherwise,
3596 we need to include the symbol value so that it
3597 becomes an addend for the dynamic reloc. For an
3598 internal symbol, we have updated addend. */
3599 continue;
3600 }
3601 /* FALLTHROUGH */
3602 case R_386_PC32:
3603 case R_386_PLT32:
3604 goto do_relocation;
3605
3606 case R_386_GOT32:
3607 base_got = htab->elf.sgot;
3608 off = h->got.offset;
3609
3610 if (base_got == NULL)
3611 abort ();
3612
3613 if (off == (bfd_vma) -1)
3614 {
3615 /* We can't use h->got.offset here to save state, or
3616 even just remember the offset, as finish_dynamic_symbol
3617 would use that as offset into .got. */
3618
3619 if (htab->elf.splt != NULL)
3620 {
3621 plt_index = h->plt.offset / plt_entry_size - 1;
3622 off = (plt_index + 3) * 4;
3623 base_got = htab->elf.sgotplt;
3624 }
3625 else
3626 {
3627 plt_index = h->plt.offset / plt_entry_size;
3628 off = plt_index * 4;
3629 base_got = htab->elf.igotplt;
3630 }
3631
3632 if (h->dynindx == -1
3633 || h->forced_local
3634 || info->symbolic)
3635 {
3636 /* This references the local defitionion. We must
3637 initialize this entry in the global offset table.
3638 Since the offset must always be a multiple of 8,
3639 we use the least significant bit to record
3640 whether we have initialized it already.
3641
3642 When doing a dynamic link, we create a .rela.got
3643 relocation entry to initialize the value. This
3644 is done in the finish_dynamic_symbol routine. */
3645 if ((off & 1) != 0)
3646 off &= ~1;
3647 else
3648 {
3649 bfd_put_32 (output_bfd, relocation,
3650 base_got->contents + off);
3651 h->got.offset |= 1;
3652 }
3653 }
3654
3655 relocation = off;
3656
3657 /* Adjust for static executables. */
3658 if (htab->elf.splt == NULL)
3659 relocation += gotplt->output_offset;
3660 }
3661 else
3662 {
3663 relocation = (base_got->output_section->vma
3664 + base_got->output_offset + off
3665 - gotplt->output_section->vma
3666 - gotplt->output_offset);
3667 /* Adjust for static executables. */
3668 if (htab->elf.splt == NULL)
3669 relocation += gotplt->output_offset;
3670 }
3671
3672 goto do_relocation;
3673
3674 case R_386_GOTOFF:
3675 relocation -= (gotplt->output_section->vma
3676 + gotplt->output_offset);
3677 goto do_relocation;
3678 }
3679 }
3680
3681 switch (r_type)
3682 {
3683 case R_386_GOT32:
3684 /* Relocation is to the entry for this symbol in the global
3685 offset table. */
3686 if (htab->elf.sgot == NULL)
3687 abort ();
3688
3689 if (h != NULL)
3690 {
3691 bfd_boolean dyn;
3692
3693 off = h->got.offset;
3694 dyn = htab->elf.dynamic_sections_created;
3695 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3696 || (info->shared
3697 && SYMBOL_REFERENCES_LOCAL (info, h))
3698 || (ELF_ST_VISIBILITY (h->other)
3699 && h->root.type == bfd_link_hash_undefweak))
3700 {
3701 /* This is actually a static link, or it is a
3702 -Bsymbolic link and the symbol is defined
3703 locally, or the symbol was forced to be local
3704 because of a version file. We must initialize
3705 this entry in the global offset table. Since the
3706 offset must always be a multiple of 4, we use the
3707 least significant bit to record whether we have
3708 initialized it already.
3709
3710 When doing a dynamic link, we create a .rel.got
3711 relocation entry to initialize the value. This
3712 is done in the finish_dynamic_symbol routine. */
3713 if ((off & 1) != 0)
3714 off &= ~1;
3715 else
3716 {
3717 bfd_put_32 (output_bfd, relocation,
3718 htab->elf.sgot->contents + off);
3719 h->got.offset |= 1;
3720 }
3721 }
3722 else
3723 unresolved_reloc = FALSE;
3724 }
3725 else
3726 {
3727 if (local_got_offsets == NULL)
3728 abort ();
3729
3730 off = local_got_offsets[r_symndx];
3731
3732 /* The offset must always be a multiple of 4. We use
3733 the least significant bit to record whether we have
3734 already generated the necessary reloc. */
3735 if ((off & 1) != 0)
3736 off &= ~1;
3737 else
3738 {
3739 bfd_put_32 (output_bfd, relocation,
3740 htab->elf.sgot->contents + off);
3741
3742 if (info->shared)
3743 {
3744 asection *s;
3745 Elf_Internal_Rela outrel;
3746
3747 s = htab->elf.srelgot;
3748 if (s == NULL)
3749 abort ();
3750
3751 outrel.r_offset = (htab->elf.sgot->output_section->vma
3752 + htab->elf.sgot->output_offset
3753 + off);
3754 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3755 elf_append_rel (output_bfd, s, &outrel);
3756 }
3757
3758 local_got_offsets[r_symndx] |= 1;
3759 }
3760 }
3761
3762 if (off >= (bfd_vma) -2)
3763 abort ();
3764
3765 relocation = htab->elf.sgot->output_section->vma
3766 + htab->elf.sgot->output_offset + off
3767 - htab->elf.sgotplt->output_section->vma
3768 - htab->elf.sgotplt->output_offset;
3769 break;
3770
3771 case R_386_GOTOFF:
3772 /* Relocation is relative to the start of the global offset
3773 table. */
3774
3775 /* Check to make sure it isn't a protected function or data
3776 symbol for shared library since it may not be local when
3777 used as function address or with copy relocation. We also
3778 need to make sure that a symbol is referenced locally. */
3779 if (!info->executable && h)
3780 {
3781 if (!h->def_regular)
3782 {
3783 const char *v;
3784
3785 switch (ELF_ST_VISIBILITY (h->other))
3786 {
3787 case STV_HIDDEN:
3788 v = _("hidden symbol");
3789 break;
3790 case STV_INTERNAL:
3791 v = _("internal symbol");
3792 break;
3793 case STV_PROTECTED:
3794 v = _("protected symbol");
3795 break;
3796 default:
3797 v = _("symbol");
3798 break;
3799 }
3800
3801 (*_bfd_error_handler)
3802 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3803 input_bfd, v, h->root.root.string);
3804 bfd_set_error (bfd_error_bad_value);
3805 return FALSE;
3806 }
3807 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3808 && (h->type == STT_FUNC
3809 || h->type == STT_OBJECT)
3810 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3811 {
3812 (*_bfd_error_handler)
3813 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3814 input_bfd,
3815 h->type == STT_FUNC ? "function" : "data",
3816 h->root.root.string);
3817 bfd_set_error (bfd_error_bad_value);
3818 return FALSE;
3819 }
3820 }
3821
3822 /* Note that sgot is not involved in this
3823 calculation. We always want the start of .got.plt. If we
3824 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3825 permitted by the ABI, we might have to change this
3826 calculation. */
3827 relocation -= htab->elf.sgotplt->output_section->vma
3828 + htab->elf.sgotplt->output_offset;
3829 break;
3830
3831 case R_386_GOTPC:
3832 /* Use global offset table as symbol value. */
3833 relocation = htab->elf.sgotplt->output_section->vma
3834 + htab->elf.sgotplt->output_offset;
3835 unresolved_reloc = FALSE;
3836 break;
3837
3838 case R_386_PLT32:
3839 /* Relocation is to the entry for this symbol in the
3840 procedure linkage table. */
3841
3842 /* Resolve a PLT32 reloc against a local symbol directly,
3843 without using the procedure linkage table. */
3844 if (h == NULL)
3845 break;
3846
3847 eh = (struct elf_i386_link_hash_entry *) h;
3848 if ((h->plt.offset == (bfd_vma) -1
3849 && eh->plt_got.offset == (bfd_vma) -1)
3850 || htab->elf.splt == NULL)
3851 {
3852 /* We didn't make a PLT entry for this symbol. This
3853 happens when statically linking PIC code, or when
3854 using -Bsymbolic. */
3855 break;
3856 }
3857
3858 if (h->plt.offset != (bfd_vma) -1)
3859 {
3860 resolved_plt = htab->elf.splt;
3861 plt_offset = h->plt.offset;
3862 }
3863 else
3864 {
3865 resolved_plt = htab->plt_got;
3866 plt_offset = eh->plt_got.offset;
3867 }
3868
3869 relocation = (resolved_plt->output_section->vma
3870 + resolved_plt->output_offset
3871 + plt_offset);
3872 unresolved_reloc = FALSE;
3873 break;
3874
3875 case R_386_SIZE32:
3876 /* Set to symbol size. */
3877 relocation = st_size;
3878 /* Fall through. */
3879
3880 case R_386_32:
3881 case R_386_PC32:
3882 if ((input_section->flags & SEC_ALLOC) == 0
3883 || is_vxworks_tls)
3884 break;
3885
3886 if ((info->shared
3887 && (h == NULL
3888 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3889 || h->root.type != bfd_link_hash_undefweak)
3890 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3891 || !SYMBOL_CALLS_LOCAL (info, h)))
3892 || (ELIMINATE_COPY_RELOCS
3893 && !info->shared
3894 && h != NULL
3895 && h->dynindx != -1
3896 && !h->non_got_ref
3897 && ((h->def_dynamic
3898 && !h->def_regular)
3899 || h->root.type == bfd_link_hash_undefweak
3900 || h->root.type == bfd_link_hash_undefined)))
3901 {
3902 Elf_Internal_Rela outrel;
3903 bfd_boolean skip, relocate;
3904 asection *sreloc;
3905
3906 /* When generating a shared object, these relocations
3907 are copied into the output file to be resolved at run
3908 time. */
3909
3910 skip = FALSE;
3911 relocate = FALSE;
3912
3913 outrel.r_offset =
3914 _bfd_elf_section_offset (output_bfd, info, input_section,
3915 rel->r_offset);
3916 if (outrel.r_offset == (bfd_vma) -1)
3917 skip = TRUE;
3918 else if (outrel.r_offset == (bfd_vma) -2)
3919 skip = TRUE, relocate = TRUE;
3920 outrel.r_offset += (input_section->output_section->vma
3921 + input_section->output_offset);
3922
3923 if (skip)
3924 memset (&outrel, 0, sizeof outrel);
3925 else if (h != NULL
3926 && h->dynindx != -1
3927 && (r_type == R_386_PC32
3928 || !info->shared
3929 || !SYMBOLIC_BIND (info, h)
3930 || !h->def_regular))
3931 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3932 else
3933 {
3934 /* This symbol is local, or marked to become local. */
3935 relocate = TRUE;
3936 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3937 }
3938
3939 sreloc = elf_section_data (input_section)->sreloc;
3940
3941 if (sreloc == NULL || sreloc->contents == NULL)
3942 {
3943 r = bfd_reloc_notsupported;
3944 goto check_relocation_error;
3945 }
3946
3947 elf_append_rel (output_bfd, sreloc, &outrel);
3948
3949 /* If this reloc is against an external symbol, we do
3950 not want to fiddle with the addend. Otherwise, we
3951 need to include the symbol value so that it becomes
3952 an addend for the dynamic reloc. */
3953 if (! relocate)
3954 continue;
3955 }
3956 break;
3957
3958 case R_386_TLS_IE:
3959 if (!info->executable)
3960 {
3961 Elf_Internal_Rela outrel;
3962 asection *sreloc;
3963
3964 outrel.r_offset = rel->r_offset
3965 + input_section->output_section->vma
3966 + input_section->output_offset;
3967 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3968 sreloc = elf_section_data (input_section)->sreloc;
3969 if (sreloc == NULL)
3970 abort ();
3971 elf_append_rel (output_bfd, sreloc, &outrel);
3972 }
3973 /* Fall through */
3974
3975 case R_386_TLS_GD:
3976 case R_386_TLS_GOTDESC:
3977 case R_386_TLS_DESC_CALL:
3978 case R_386_TLS_IE_32:
3979 case R_386_TLS_GOTIE:
3980 tls_type = GOT_UNKNOWN;
3981 if (h == NULL && local_got_offsets)
3982 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3983 else if (h != NULL)
3984 tls_type = elf_i386_hash_entry(h)->tls_type;
3985 if (tls_type == GOT_TLS_IE)
3986 tls_type = GOT_TLS_IE_NEG;
3987
3988 if (! elf_i386_tls_transition (info, input_bfd,
3989 input_section, contents,
3990 symtab_hdr, sym_hashes,
3991 &r_type, tls_type, rel,
3992 relend, h, r_symndx))
3993 return FALSE;
3994
3995 if (r_type == R_386_TLS_LE_32)
3996 {
3997 BFD_ASSERT (! unresolved_reloc);
3998 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3999 {
4000 unsigned int type;
4001 bfd_vma roff;
4002
4003 /* GD->LE transition. */
4004 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4005 if (type == 0x04)
4006 {
4007 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4008 Change it into:
4009 movl %gs:0, %eax; subl $foo@tpoff, %eax
4010 (6 byte form of subl). */
4011 memcpy (contents + rel->r_offset - 3,
4012 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4013 roff = rel->r_offset + 5;
4014 }
4015 else
4016 {
4017 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4018 Change it into:
4019 movl %gs:0, %eax; subl $foo@tpoff, %eax
4020 (6 byte form of subl). */
4021 memcpy (contents + rel->r_offset - 2,
4022 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4023 roff = rel->r_offset + 6;
4024 }
4025 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4026 contents + roff);
4027 /* Skip R_386_PC32/R_386_PLT32. */
4028 rel++;
4029 continue;
4030 }
4031 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4032 {
4033 /* GDesc -> LE transition.
4034 It's originally something like:
4035 leal x@tlsdesc(%ebx), %eax
4036
4037 leal x@ntpoff, %eax
4038
4039 Registers other than %eax may be set up here. */
4040
4041 unsigned int val;
4042 bfd_vma roff;
4043
4044 roff = rel->r_offset;
4045 val = bfd_get_8 (input_bfd, contents + roff - 1);
4046
4047 /* Now modify the instruction as appropriate. */
4048 /* aoliva FIXME: remove the above and xor the byte
4049 below with 0x86. */
4050 bfd_put_8 (output_bfd, val ^ 0x86,
4051 contents + roff - 1);
4052 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4053 contents + roff);
4054 continue;
4055 }
4056 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4057 {
4058 /* GDesc -> LE transition.
4059 It's originally:
4060 call *(%eax)
4061 Turn it into:
4062 xchg %ax,%ax */
4063
4064 bfd_vma roff;
4065
4066 roff = rel->r_offset;
4067 bfd_put_8 (output_bfd, 0x66, contents + roff);
4068 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4069 continue;
4070 }
4071 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4072 {
4073 unsigned int val;
4074
4075 /* IE->LE transition:
4076 Originally it can be one of:
4077 movl foo, %eax
4078 movl foo, %reg
4079 addl foo, %reg
4080 We change it into:
4081 movl $foo, %eax
4082 movl $foo, %reg
4083 addl $foo, %reg. */
4084 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4085 if (val == 0xa1)
4086 {
4087 /* movl foo, %eax. */
4088 bfd_put_8 (output_bfd, 0xb8,
4089 contents + rel->r_offset - 1);
4090 }
4091 else
4092 {
4093 unsigned int type;
4094
4095 type = bfd_get_8 (input_bfd,
4096 contents + rel->r_offset - 2);
4097 switch (type)
4098 {
4099 case 0x8b:
4100 /* movl */
4101 bfd_put_8 (output_bfd, 0xc7,
4102 contents + rel->r_offset - 2);
4103 bfd_put_8 (output_bfd,
4104 0xc0 | ((val >> 3) & 7),
4105 contents + rel->r_offset - 1);
4106 break;
4107 case 0x03:
4108 /* addl */
4109 bfd_put_8 (output_bfd, 0x81,
4110 contents + rel->r_offset - 2);
4111 bfd_put_8 (output_bfd,
4112 0xc0 | ((val >> 3) & 7),
4113 contents + rel->r_offset - 1);
4114 break;
4115 default:
4116 BFD_FAIL ();
4117 break;
4118 }
4119 }
4120 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4121 contents + rel->r_offset);
4122 continue;
4123 }
4124 else
4125 {
4126 unsigned int val, type;
4127
4128 /* {IE_32,GOTIE}->LE transition:
4129 Originally it can be one of:
4130 subl foo(%reg1), %reg2
4131 movl foo(%reg1), %reg2
4132 addl foo(%reg1), %reg2
4133 We change it into:
4134 subl $foo, %reg2
4135 movl $foo, %reg2 (6 byte form)
4136 addl $foo, %reg2. */
4137 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4138 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4139 if (type == 0x8b)
4140 {
4141 /* movl */
4142 bfd_put_8 (output_bfd, 0xc7,
4143 contents + rel->r_offset - 2);
4144 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4145 contents + rel->r_offset - 1);
4146 }
4147 else if (type == 0x2b)
4148 {
4149 /* subl */
4150 bfd_put_8 (output_bfd, 0x81,
4151 contents + rel->r_offset - 2);
4152 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4153 contents + rel->r_offset - 1);
4154 }
4155 else if (type == 0x03)
4156 {
4157 /* addl */
4158 bfd_put_8 (output_bfd, 0x81,
4159 contents + rel->r_offset - 2);
4160 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4161 contents + rel->r_offset - 1);
4162 }
4163 else
4164 BFD_FAIL ();
4165 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4166 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4167 contents + rel->r_offset);
4168 else
4169 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4170 contents + rel->r_offset);
4171 continue;
4172 }
4173 }
4174
4175 if (htab->elf.sgot == NULL)
4176 abort ();
4177
4178 if (h != NULL)
4179 {
4180 off = h->got.offset;
4181 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4182 }
4183 else
4184 {
4185 if (local_got_offsets == NULL)
4186 abort ();
4187
4188 off = local_got_offsets[r_symndx];
4189 offplt = local_tlsdesc_gotents[r_symndx];
4190 }
4191
4192 if ((off & 1) != 0)
4193 off &= ~1;
4194 else
4195 {
4196 Elf_Internal_Rela outrel;
4197 int dr_type;
4198 asection *sreloc;
4199
4200 if (htab->elf.srelgot == NULL)
4201 abort ();
4202
4203 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4204
4205 if (GOT_TLS_GDESC_P (tls_type))
4206 {
4207 bfd_byte *loc;
4208 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4209 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4210 <= htab->elf.sgotplt->size);
4211 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4212 + htab->elf.sgotplt->output_offset
4213 + offplt
4214 + htab->sgotplt_jump_table_size);
4215 sreloc = htab->elf.srelplt;
4216 loc = sreloc->contents;
4217 loc += (htab->next_tls_desc_index++
4218 * sizeof (Elf32_External_Rel));
4219 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4220 <= sreloc->contents + sreloc->size);
4221 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4222 if (indx == 0)
4223 {
4224 BFD_ASSERT (! unresolved_reloc);
4225 bfd_put_32 (output_bfd,
4226 relocation - elf_i386_dtpoff_base (info),
4227 htab->elf.sgotplt->contents + offplt
4228 + htab->sgotplt_jump_table_size + 4);
4229 }
4230 else
4231 {
4232 bfd_put_32 (output_bfd, 0,
4233 htab->elf.sgotplt->contents + offplt
4234 + htab->sgotplt_jump_table_size + 4);
4235 }
4236 }
4237
4238 sreloc = htab->elf.srelgot;
4239
4240 outrel.r_offset = (htab->elf.sgot->output_section->vma
4241 + htab->elf.sgot->output_offset + off);
4242
4243 if (GOT_TLS_GD_P (tls_type))
4244 dr_type = R_386_TLS_DTPMOD32;
4245 else if (GOT_TLS_GDESC_P (tls_type))
4246 goto dr_done;
4247 else if (tls_type == GOT_TLS_IE_POS)
4248 dr_type = R_386_TLS_TPOFF;
4249 else
4250 dr_type = R_386_TLS_TPOFF32;
4251
4252 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4253 bfd_put_32 (output_bfd,
4254 relocation - elf_i386_dtpoff_base (info),
4255 htab->elf.sgot->contents + off);
4256 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4257 bfd_put_32 (output_bfd,
4258 elf_i386_dtpoff_base (info) - relocation,
4259 htab->elf.sgot->contents + off);
4260 else if (dr_type != R_386_TLS_DESC)
4261 bfd_put_32 (output_bfd, 0,
4262 htab->elf.sgot->contents + off);
4263 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4264
4265 elf_append_rel (output_bfd, sreloc, &outrel);
4266
4267 if (GOT_TLS_GD_P (tls_type))
4268 {
4269 if (indx == 0)
4270 {
4271 BFD_ASSERT (! unresolved_reloc);
4272 bfd_put_32 (output_bfd,
4273 relocation - elf_i386_dtpoff_base (info),
4274 htab->elf.sgot->contents + off + 4);
4275 }
4276 else
4277 {
4278 bfd_put_32 (output_bfd, 0,
4279 htab->elf.sgot->contents + off + 4);
4280 outrel.r_info = ELF32_R_INFO (indx,
4281 R_386_TLS_DTPOFF32);
4282 outrel.r_offset += 4;
4283 elf_append_rel (output_bfd, sreloc, &outrel);
4284 }
4285 }
4286 else if (tls_type == GOT_TLS_IE_BOTH)
4287 {
4288 bfd_put_32 (output_bfd,
4289 (indx == 0
4290 ? relocation - elf_i386_dtpoff_base (info)
4291 : 0),
4292 htab->elf.sgot->contents + off + 4);
4293 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4294 outrel.r_offset += 4;
4295 elf_append_rel (output_bfd, sreloc, &outrel);
4296 }
4297
4298 dr_done:
4299 if (h != NULL)
4300 h->got.offset |= 1;
4301 else
4302 local_got_offsets[r_symndx] |= 1;
4303 }
4304
4305 if (off >= (bfd_vma) -2
4306 && ! GOT_TLS_GDESC_P (tls_type))
4307 abort ();
4308 if (r_type == R_386_TLS_GOTDESC
4309 || r_type == R_386_TLS_DESC_CALL)
4310 {
4311 relocation = htab->sgotplt_jump_table_size + offplt;
4312 unresolved_reloc = FALSE;
4313 }
4314 else if (r_type == ELF32_R_TYPE (rel->r_info))
4315 {
4316 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4317 + htab->elf.sgotplt->output_offset;
4318 relocation = htab->elf.sgot->output_section->vma
4319 + htab->elf.sgot->output_offset + off - g_o_t;
4320 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4321 && tls_type == GOT_TLS_IE_BOTH)
4322 relocation += 4;
4323 if (r_type == R_386_TLS_IE)
4324 relocation += g_o_t;
4325 unresolved_reloc = FALSE;
4326 }
4327 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4328 {
4329 unsigned int val, type;
4330 bfd_vma roff;
4331
4332 /* GD->IE transition. */
4333 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4334 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4335 if (type == 0x04)
4336 {
4337 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4338 Change it into:
4339 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4340 val >>= 3;
4341 roff = rel->r_offset - 3;
4342 }
4343 else
4344 {
4345 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4346 Change it into:
4347 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4348 roff = rel->r_offset - 2;
4349 }
4350 memcpy (contents + roff,
4351 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4352 contents[roff + 7] = 0x80 | (val & 7);
4353 /* If foo is used only with foo@gotntpoff(%reg) and
4354 foo@indntpoff, but not with foo@gottpoff(%reg), change
4355 subl $foo@gottpoff(%reg), %eax
4356 into:
4357 addl $foo@gotntpoff(%reg), %eax. */
4358 if (tls_type == GOT_TLS_IE_POS)
4359 contents[roff + 6] = 0x03;
4360 bfd_put_32 (output_bfd,
4361 htab->elf.sgot->output_section->vma
4362 + htab->elf.sgot->output_offset + off
4363 - htab->elf.sgotplt->output_section->vma
4364 - htab->elf.sgotplt->output_offset,
4365 contents + roff + 8);
4366 /* Skip R_386_PLT32. */
4367 rel++;
4368 continue;
4369 }
4370 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4371 {
4372 /* GDesc -> IE transition.
4373 It's originally something like:
4374 leal x@tlsdesc(%ebx), %eax
4375
4376 Change it to:
4377 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4378 or:
4379 movl x@gottpoff(%ebx), %eax # before negl %eax
4380
4381 Registers other than %eax may be set up here. */
4382
4383 bfd_vma roff;
4384
4385 /* First, make sure it's a leal adding ebx to a 32-bit
4386 offset into any register, although it's probably
4387 almost always going to be eax. */
4388 roff = rel->r_offset;
4389
4390 /* Now modify the instruction as appropriate. */
4391 /* To turn a leal into a movl in the form we use it, it
4392 suffices to change the first byte from 0x8d to 0x8b.
4393 aoliva FIXME: should we decide to keep the leal, all
4394 we have to do is remove the statement below, and
4395 adjust the relaxation of R_386_TLS_DESC_CALL. */
4396 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4397
4398 if (tls_type == GOT_TLS_IE_BOTH)
4399 off += 4;
4400
4401 bfd_put_32 (output_bfd,
4402 htab->elf.sgot->output_section->vma
4403 + htab->elf.sgot->output_offset + off
4404 - htab->elf.sgotplt->output_section->vma
4405 - htab->elf.sgotplt->output_offset,
4406 contents + roff);
4407 continue;
4408 }
4409 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4410 {
4411 /* GDesc -> IE transition.
4412 It's originally:
4413 call *(%eax)
4414
4415 Change it to:
4416 xchg %ax,%ax
4417 or
4418 negl %eax
4419 depending on how we transformed the TLS_GOTDESC above.
4420 */
4421
4422 bfd_vma roff;
4423
4424 roff = rel->r_offset;
4425
4426 /* Now modify the instruction as appropriate. */
4427 if (tls_type != GOT_TLS_IE_NEG)
4428 {
4429 /* xchg %ax,%ax */
4430 bfd_put_8 (output_bfd, 0x66, contents + roff);
4431 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4432 }
4433 else
4434 {
4435 /* negl %eax */
4436 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4437 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4438 }
4439
4440 continue;
4441 }
4442 else
4443 BFD_ASSERT (FALSE);
4444 break;
4445
4446 case R_386_TLS_LDM:
4447 if (! elf_i386_tls_transition (info, input_bfd,
4448 input_section, contents,
4449 symtab_hdr, sym_hashes,
4450 &r_type, GOT_UNKNOWN, rel,
4451 relend, h, r_symndx))
4452 return FALSE;
4453
4454 if (r_type != R_386_TLS_LDM)
4455 {
4456 /* LD->LE transition:
4457 leal foo(%reg), %eax; call ___tls_get_addr.
4458 We change it into:
4459 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4460 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4461 memcpy (contents + rel->r_offset - 2,
4462 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4463 /* Skip R_386_PC32/R_386_PLT32. */
4464 rel++;
4465 continue;
4466 }
4467
4468 if (htab->elf.sgot == NULL)
4469 abort ();
4470
4471 off = htab->tls_ldm_got.offset;
4472 if (off & 1)
4473 off &= ~1;
4474 else
4475 {
4476 Elf_Internal_Rela outrel;
4477
4478 if (htab->elf.srelgot == NULL)
4479 abort ();
4480
4481 outrel.r_offset = (htab->elf.sgot->output_section->vma
4482 + htab->elf.sgot->output_offset + off);
4483
4484 bfd_put_32 (output_bfd, 0,
4485 htab->elf.sgot->contents + off);
4486 bfd_put_32 (output_bfd, 0,
4487 htab->elf.sgot->contents + off + 4);
4488 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4489 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4490 htab->tls_ldm_got.offset |= 1;
4491 }
4492 relocation = htab->elf.sgot->output_section->vma
4493 + htab->elf.sgot->output_offset + off
4494 - htab->elf.sgotplt->output_section->vma
4495 - htab->elf.sgotplt->output_offset;
4496 unresolved_reloc = FALSE;
4497 break;
4498
4499 case R_386_TLS_LDO_32:
4500 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4501 relocation -= elf_i386_dtpoff_base (info);
4502 else
4503 /* When converting LDO to LE, we must negate. */
4504 relocation = -elf_i386_tpoff (info, relocation);
4505 break;
4506
4507 case R_386_TLS_LE_32:
4508 case R_386_TLS_LE:
4509 if (!info->executable)
4510 {
4511 Elf_Internal_Rela outrel;
4512 asection *sreloc;
4513
4514 outrel.r_offset = rel->r_offset
4515 + input_section->output_section->vma
4516 + input_section->output_offset;
4517 if (h != NULL && h->dynindx != -1)
4518 indx = h->dynindx;
4519 else
4520 indx = 0;
4521 if (r_type == R_386_TLS_LE_32)
4522 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4523 else
4524 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4525 sreloc = elf_section_data (input_section)->sreloc;
4526 if (sreloc == NULL)
4527 abort ();
4528 elf_append_rel (output_bfd, sreloc, &outrel);
4529 if (indx)
4530 continue;
4531 else if (r_type == R_386_TLS_LE_32)
4532 relocation = elf_i386_dtpoff_base (info) - relocation;
4533 else
4534 relocation -= elf_i386_dtpoff_base (info);
4535 }
4536 else if (r_type == R_386_TLS_LE_32)
4537 relocation = elf_i386_tpoff (info, relocation);
4538 else
4539 relocation = -elf_i386_tpoff (info, relocation);
4540 break;
4541
4542 default:
4543 break;
4544 }
4545
4546 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4547 because such sections are not SEC_ALLOC and thus ld.so will
4548 not process them. */
4549 if (unresolved_reloc
4550 && !((input_section->flags & SEC_DEBUGGING) != 0
4551 && h->def_dynamic)
4552 && _bfd_elf_section_offset (output_bfd, info, input_section,
4553 rel->r_offset) != (bfd_vma) -1)
4554 {
4555 (*_bfd_error_handler)
4556 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4557 input_bfd,
4558 input_section,
4559 (long) rel->r_offset,
4560 howto->name,
4561 h->root.root.string);
4562 return FALSE;
4563 }
4564
4565 do_relocation:
4566 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4567 contents, rel->r_offset,
4568 relocation, 0);
4569
4570 check_relocation_error:
4571 if (r != bfd_reloc_ok)
4572 {
4573 const char *name;
4574
4575 if (h != NULL)
4576 name = h->root.root.string;
4577 else
4578 {
4579 name = bfd_elf_string_from_elf_section (input_bfd,
4580 symtab_hdr->sh_link,
4581 sym->st_name);
4582 if (name == NULL)
4583 return FALSE;
4584 if (*name == '\0')
4585 name = bfd_section_name (input_bfd, sec);
4586 }
4587
4588 if (r == bfd_reloc_overflow)
4589 {
4590 if (! ((*info->callbacks->reloc_overflow)
4591 (info, (h ? &h->root : NULL), name, howto->name,
4592 (bfd_vma) 0, input_bfd, input_section,
4593 rel->r_offset)))
4594 return FALSE;
4595 }
4596 else
4597 {
4598 (*_bfd_error_handler)
4599 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4600 input_bfd, input_section,
4601 (long) rel->r_offset, name, (int) r);
4602 return FALSE;
4603 }
4604 }
4605 }
4606
4607 return TRUE;
4608 }
4609
4610 /* Finish up dynamic symbol handling. We set the contents of various
4611 dynamic sections here. */
4612
4613 static bfd_boolean
4614 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4615 struct bfd_link_info *info,
4616 struct elf_link_hash_entry *h,
4617 Elf_Internal_Sym *sym)
4618 {
4619 struct elf_i386_link_hash_table *htab;
4620 unsigned plt_entry_size;
4621 const struct elf_i386_backend_data *abed;
4622 struct elf_i386_link_hash_entry *eh;
4623
4624 htab = elf_i386_hash_table (info);
4625 if (htab == NULL)
4626 return FALSE;
4627
4628 abed = get_elf_i386_backend_data (output_bfd);
4629 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4630
4631 eh = (struct elf_i386_link_hash_entry *) h;
4632
4633 if (h->plt.offset != (bfd_vma) -1)
4634 {
4635 bfd_vma plt_index;
4636 bfd_vma got_offset;
4637 Elf_Internal_Rela rel;
4638 bfd_byte *loc;
4639 asection *plt, *gotplt, *relplt;
4640
4641 /* When building a static executable, use .iplt, .igot.plt and
4642 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4643 if (htab->elf.splt != NULL)
4644 {
4645 plt = htab->elf.splt;
4646 gotplt = htab->elf.sgotplt;
4647 relplt = htab->elf.srelplt;
4648 }
4649 else
4650 {
4651 plt = htab->elf.iplt;
4652 gotplt = htab->elf.igotplt;
4653 relplt = htab->elf.irelplt;
4654 }
4655
4656 /* This symbol has an entry in the procedure linkage table. Set
4657 it up. */
4658
4659 if ((h->dynindx == -1
4660 && !((h->forced_local || info->executable)
4661 && h->def_regular
4662 && h->type == STT_GNU_IFUNC))
4663 || plt == NULL
4664 || gotplt == NULL
4665 || relplt == NULL)
4666 abort ();
4667
4668 /* Get the index in the procedure linkage table which
4669 corresponds to this symbol. This is the index of this symbol
4670 in all the symbols for which we are making plt entries. The
4671 first entry in the procedure linkage table is reserved.
4672
4673 Get the offset into the .got table of the entry that
4674 corresponds to this function. Each .got entry is 4 bytes.
4675 The first three are reserved.
4676
4677 For static executables, we don't reserve anything. */
4678
4679 if (plt == htab->elf.splt)
4680 {
4681 got_offset = h->plt.offset / plt_entry_size - 1;
4682 got_offset = (got_offset + 3) * 4;
4683 }
4684 else
4685 {
4686 got_offset = h->plt.offset / plt_entry_size;
4687 got_offset = got_offset * 4;
4688 }
4689
4690 /* Fill in the entry in the procedure linkage table. */
4691 if (! info->shared)
4692 {
4693 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4694 abed->plt->plt_entry_size);
4695 bfd_put_32 (output_bfd,
4696 (gotplt->output_section->vma
4697 + gotplt->output_offset
4698 + got_offset),
4699 plt->contents + h->plt.offset
4700 + abed->plt->plt_got_offset);
4701
4702 if (abed->is_vxworks)
4703 {
4704 int s, k, reloc_index;
4705
4706 /* Create the R_386_32 relocation referencing the GOT
4707 for this PLT entry. */
4708
4709 /* S: Current slot number (zero-based). */
4710 s = ((h->plt.offset - abed->plt->plt_entry_size)
4711 / abed->plt->plt_entry_size);
4712 /* K: Number of relocations for PLTResolve. */
4713 if (info->shared)
4714 k = PLTRESOLVE_RELOCS_SHLIB;
4715 else
4716 k = PLTRESOLVE_RELOCS;
4717 /* Skip the PLTresolve relocations, and the relocations for
4718 the other PLT slots. */
4719 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4720 loc = (htab->srelplt2->contents + reloc_index
4721 * sizeof (Elf32_External_Rel));
4722
4723 rel.r_offset = (htab->elf.splt->output_section->vma
4724 + htab->elf.splt->output_offset
4725 + h->plt.offset + 2),
4726 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4727 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4728
4729 /* Create the R_386_32 relocation referencing the beginning of
4730 the PLT for this GOT entry. */
4731 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4732 + htab->elf.sgotplt->output_offset
4733 + got_offset);
4734 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4735 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4736 loc + sizeof (Elf32_External_Rel));
4737 }
4738 }
4739 else
4740 {
4741 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4742 abed->plt->plt_entry_size);
4743 bfd_put_32 (output_bfd, got_offset,
4744 plt->contents + h->plt.offset
4745 + abed->plt->plt_got_offset);
4746 }
4747
4748 /* Fill in the entry in the global offset table. */
4749 bfd_put_32 (output_bfd,
4750 (plt->output_section->vma
4751 + plt->output_offset
4752 + h->plt.offset
4753 + abed->plt->plt_lazy_offset),
4754 gotplt->contents + got_offset);
4755
4756 /* Fill in the entry in the .rel.plt section. */
4757 rel.r_offset = (gotplt->output_section->vma
4758 + gotplt->output_offset
4759 + got_offset);
4760 if (h->dynindx == -1
4761 || ((info->executable
4762 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4763 && h->def_regular
4764 && h->type == STT_GNU_IFUNC))
4765 {
4766 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4767 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4768 in the .got.plt section. */
4769 bfd_put_32 (output_bfd,
4770 (h->root.u.def.value
4771 + h->root.u.def.section->output_section->vma
4772 + h->root.u.def.section->output_offset),
4773 gotplt->contents + got_offset);
4774 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4775 /* R_386_IRELATIVE comes last. */
4776 plt_index = htab->next_irelative_index--;
4777 }
4778 else
4779 {
4780 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4781 plt_index = htab->next_jump_slot_index++;
4782 }
4783 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4784 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4785
4786 /* Don't fill PLT entry for static executables. */
4787 if (plt == htab->elf.splt)
4788 {
4789 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4790 plt->contents + h->plt.offset
4791 + abed->plt->plt_reloc_offset);
4792 bfd_put_32 (output_bfd, - (h->plt.offset
4793 + abed->plt->plt_plt_offset + 4),
4794 plt->contents + h->plt.offset
4795 + abed->plt->plt_plt_offset);
4796 }
4797 }
4798 else if (eh->plt_got.offset != (bfd_vma) -1)
4799 {
4800 bfd_vma got_offset, plt_offset;
4801 asection *plt, *got, *gotplt;
4802 const bfd_byte *got_plt_entry;
4803
4804 /* Offset of displacement of the indirect jump. */
4805 bfd_vma plt_got_offset = 2;
4806
4807 /* Set the entry in the GOT procedure linkage table. */
4808 plt = htab->plt_got;
4809 got = htab->elf.sgot;
4810 gotplt = htab->elf.sgotplt;
4811 got_offset = h->got.offset;
4812
4813 if (got_offset == (bfd_vma) -1
4814 || plt == NULL
4815 || got == NULL
4816 || gotplt == NULL)
4817 abort ();
4818
4819 /* Fill in the entry in the GOT procedure linkage table. */
4820 if (! info->shared)
4821 {
4822 got_plt_entry = elf_i386_got_plt_entry;
4823 got_offset += got->output_section->vma + got->output_offset;
4824 }
4825 else
4826 {
4827 got_plt_entry = elf_i386_pic_got_plt_entry;
4828 got_offset += (got->output_section->vma
4829 + got->output_offset
4830 - gotplt->output_section->vma
4831 - gotplt->output_offset);
4832 }
4833
4834 plt_offset = eh->plt_got.offset;
4835 memcpy (plt->contents + plt_offset, got_plt_entry,
4836 sizeof (elf_i386_got_plt_entry));
4837 bfd_put_32 (output_bfd, got_offset,
4838 plt->contents + plt_offset + plt_got_offset);
4839 }
4840
4841 if (!h->def_regular
4842 && (h->plt.offset != (bfd_vma) -1
4843 || eh->plt_got.offset != (bfd_vma) -1))
4844 {
4845 /* Mark the symbol as undefined, rather than as defined in
4846 the .plt section. Leave the value if there were any
4847 relocations where pointer equality matters (this is a clue
4848 for the dynamic linker, to make function pointer
4849 comparisons work between an application and shared
4850 library), otherwise set it to zero. If a function is only
4851 called from a binary, there is no need to slow down
4852 shared libraries because of that. */
4853 sym->st_shndx = SHN_UNDEF;
4854 if (!h->pointer_equality_needed)
4855 sym->st_value = 0;
4856 }
4857
4858 if (h->got.offset != (bfd_vma) -1
4859 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4860 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4861 {
4862 Elf_Internal_Rela rel;
4863
4864 /* This symbol has an entry in the global offset table. Set it
4865 up. */
4866
4867 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4868 abort ();
4869
4870 rel.r_offset = (htab->elf.sgot->output_section->vma
4871 + htab->elf.sgot->output_offset
4872 + (h->got.offset & ~(bfd_vma) 1));
4873
4874 /* If this is a static link, or it is a -Bsymbolic link and the
4875 symbol is defined locally or was forced to be local because
4876 of a version file, we just want to emit a RELATIVE reloc.
4877 The entry in the global offset table will already have been
4878 initialized in the relocate_section function. */
4879 if (h->def_regular
4880 && h->type == STT_GNU_IFUNC)
4881 {
4882 if (info->shared)
4883 {
4884 /* Generate R_386_GLOB_DAT. */
4885 goto do_glob_dat;
4886 }
4887 else
4888 {
4889 asection *plt;
4890
4891 if (!h->pointer_equality_needed)
4892 abort ();
4893
4894 /* For non-shared object, we can't use .got.plt, which
4895 contains the real function addres if we need pointer
4896 equality. We load the GOT entry with the PLT entry. */
4897 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4898 bfd_put_32 (output_bfd,
4899 (plt->output_section->vma
4900 + plt->output_offset + h->plt.offset),
4901 htab->elf.sgot->contents + h->got.offset);
4902 return TRUE;
4903 }
4904 }
4905 else if (info->shared
4906 && SYMBOL_REFERENCES_LOCAL (info, h))
4907 {
4908 BFD_ASSERT((h->got.offset & 1) != 0);
4909 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4910 }
4911 else
4912 {
4913 BFD_ASSERT((h->got.offset & 1) == 0);
4914 do_glob_dat:
4915 bfd_put_32 (output_bfd, (bfd_vma) 0,
4916 htab->elf.sgot->contents + h->got.offset);
4917 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4918 }
4919
4920 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4921 }
4922
4923 if (h->needs_copy)
4924 {
4925 Elf_Internal_Rela rel;
4926
4927 /* This symbol needs a copy reloc. Set it up. */
4928
4929 if (h->dynindx == -1
4930 || (h->root.type != bfd_link_hash_defined
4931 && h->root.type != bfd_link_hash_defweak)
4932 || htab->srelbss == NULL)
4933 abort ();
4934
4935 rel.r_offset = (h->root.u.def.value
4936 + h->root.u.def.section->output_section->vma
4937 + h->root.u.def.section->output_offset);
4938 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4939 elf_append_rel (output_bfd, htab->srelbss, &rel);
4940 }
4941
4942 return TRUE;
4943 }
4944
4945 /* Finish up local dynamic symbol handling. We set the contents of
4946 various dynamic sections here. */
4947
4948 static bfd_boolean
4949 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4950 {
4951 struct elf_link_hash_entry *h
4952 = (struct elf_link_hash_entry *) *slot;
4953 struct bfd_link_info *info
4954 = (struct bfd_link_info *) inf;
4955
4956 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4957 h, NULL);
4958 }
4959
4960 /* Used to decide how to sort relocs in an optimal manner for the
4961 dynamic linker, before writing them out. */
4962
4963 static enum elf_reloc_type_class
4964 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4965 const asection *rel_sec ATTRIBUTE_UNUSED,
4966 const Elf_Internal_Rela *rela)
4967 {
4968 switch (ELF32_R_TYPE (rela->r_info))
4969 {
4970 case R_386_RELATIVE:
4971 return reloc_class_relative;
4972 case R_386_JUMP_SLOT:
4973 return reloc_class_plt;
4974 case R_386_COPY:
4975 return reloc_class_copy;
4976 default:
4977 return reloc_class_normal;
4978 }
4979 }
4980
4981 /* Finish up the dynamic sections. */
4982
4983 static bfd_boolean
4984 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4985 struct bfd_link_info *info)
4986 {
4987 struct elf_i386_link_hash_table *htab;
4988 bfd *dynobj;
4989 asection *sdyn;
4990 const struct elf_i386_backend_data *abed;
4991
4992 htab = elf_i386_hash_table (info);
4993 if (htab == NULL)
4994 return FALSE;
4995
4996 dynobj = htab->elf.dynobj;
4997 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4998 abed = get_elf_i386_backend_data (output_bfd);
4999
5000 if (htab->elf.dynamic_sections_created)
5001 {
5002 Elf32_External_Dyn *dyncon, *dynconend;
5003
5004 if (sdyn == NULL || htab->elf.sgot == NULL)
5005 abort ();
5006
5007 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5008 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5009 for (; dyncon < dynconend; dyncon++)
5010 {
5011 Elf_Internal_Dyn dyn;
5012 asection *s;
5013
5014 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5015
5016 switch (dyn.d_tag)
5017 {
5018 default:
5019 if (abed->is_vxworks
5020 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5021 break;
5022 continue;
5023
5024 case DT_PLTGOT:
5025 s = htab->elf.sgotplt;
5026 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5027 break;
5028
5029 case DT_JMPREL:
5030 s = htab->elf.srelplt;
5031 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5032 break;
5033
5034 case DT_PLTRELSZ:
5035 s = htab->elf.srelplt;
5036 dyn.d_un.d_val = s->size;
5037 break;
5038
5039 case DT_RELSZ:
5040 /* My reading of the SVR4 ABI indicates that the
5041 procedure linkage table relocs (DT_JMPREL) should be
5042 included in the overall relocs (DT_REL). This is
5043 what Solaris does. However, UnixWare can not handle
5044 that case. Therefore, we override the DT_RELSZ entry
5045 here to make it not include the JMPREL relocs. */
5046 s = htab->elf.srelplt;
5047 if (s == NULL)
5048 continue;
5049 dyn.d_un.d_val -= s->size;
5050 break;
5051
5052 case DT_REL:
5053 /* We may not be using the standard ELF linker script.
5054 If .rel.plt is the first .rel section, we adjust
5055 DT_REL to not include it. */
5056 s = htab->elf.srelplt;
5057 if (s == NULL)
5058 continue;
5059 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5060 continue;
5061 dyn.d_un.d_ptr += s->size;
5062 break;
5063 }
5064
5065 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5066 }
5067
5068 /* Fill in the first entry in the procedure linkage table. */
5069 if (htab->elf.splt && htab->elf.splt->size > 0)
5070 {
5071 if (info->shared)
5072 {
5073 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5074 abed->plt->plt0_entry_size);
5075 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5076 abed->plt0_pad_byte,
5077 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5078 }
5079 else
5080 {
5081 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5082 abed->plt->plt0_entry_size);
5083 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5084 abed->plt0_pad_byte,
5085 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5086 bfd_put_32 (output_bfd,
5087 (htab->elf.sgotplt->output_section->vma
5088 + htab->elf.sgotplt->output_offset
5089 + 4),
5090 htab->elf.splt->contents
5091 + abed->plt->plt0_got1_offset);
5092 bfd_put_32 (output_bfd,
5093 (htab->elf.sgotplt->output_section->vma
5094 + htab->elf.sgotplt->output_offset
5095 + 8),
5096 htab->elf.splt->contents
5097 + abed->plt->plt0_got2_offset);
5098
5099 if (abed->is_vxworks)
5100 {
5101 Elf_Internal_Rela rel;
5102
5103 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5104 On IA32 we use REL relocations so the addend goes in
5105 the PLT directly. */
5106 rel.r_offset = (htab->elf.splt->output_section->vma
5107 + htab->elf.splt->output_offset
5108 + abed->plt->plt0_got1_offset);
5109 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5110 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5111 htab->srelplt2->contents);
5112 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5113 rel.r_offset = (htab->elf.splt->output_section->vma
5114 + htab->elf.splt->output_offset
5115 + abed->plt->plt0_got2_offset);
5116 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5117 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5118 htab->srelplt2->contents +
5119 sizeof (Elf32_External_Rel));
5120 }
5121 }
5122
5123 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5124 really seem like the right value. */
5125 elf_section_data (htab->elf.splt->output_section)
5126 ->this_hdr.sh_entsize = 4;
5127
5128 /* Correct the .rel.plt.unloaded relocations. */
5129 if (abed->is_vxworks && !info->shared)
5130 {
5131 int num_plts = (htab->elf.splt->size
5132 / abed->plt->plt_entry_size) - 1;
5133 unsigned char *p;
5134
5135 p = htab->srelplt2->contents;
5136 if (info->shared)
5137 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5138 else
5139 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5140
5141 for (; num_plts; num_plts--)
5142 {
5143 Elf_Internal_Rela rel;
5144 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5145 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5146 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5147 p += sizeof (Elf32_External_Rel);
5148
5149 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5150 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5151 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5152 p += sizeof (Elf32_External_Rel);
5153 }
5154 }
5155 }
5156 }
5157
5158 if (htab->elf.sgotplt)
5159 {
5160 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5161 {
5162 (*_bfd_error_handler)
5163 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5164 return FALSE;
5165 }
5166
5167 /* Fill in the first three entries in the global offset table. */
5168 if (htab->elf.sgotplt->size > 0)
5169 {
5170 bfd_put_32 (output_bfd,
5171 (sdyn == NULL ? 0
5172 : sdyn->output_section->vma + sdyn->output_offset),
5173 htab->elf.sgotplt->contents);
5174 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5175 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5176 }
5177
5178 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5179 }
5180
5181 /* Adjust .eh_frame for .plt section. */
5182 if (htab->plt_eh_frame != NULL
5183 && htab->plt_eh_frame->contents != NULL)
5184 {
5185 if (htab->elf.splt != NULL
5186 && htab->elf.splt->size != 0
5187 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5188 && htab->elf.splt->output_section != NULL
5189 && htab->plt_eh_frame->output_section != NULL)
5190 {
5191 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5192 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5193 + htab->plt_eh_frame->output_offset
5194 + PLT_FDE_START_OFFSET;
5195 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5196 htab->plt_eh_frame->contents
5197 + PLT_FDE_START_OFFSET);
5198 }
5199 if (htab->plt_eh_frame->sec_info_type
5200 == SEC_INFO_TYPE_EH_FRAME)
5201 {
5202 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5203 htab->plt_eh_frame,
5204 htab->plt_eh_frame->contents))
5205 return FALSE;
5206 }
5207 }
5208
5209 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5210 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5211
5212 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5213 htab_traverse (htab->loc_hash_table,
5214 elf_i386_finish_local_dynamic_symbol,
5215 info);
5216
5217 return TRUE;
5218 }
5219
5220 /* Return an array of PLT entry symbol values. */
5221
5222 static bfd_vma *
5223 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5224 asection *relplt)
5225 {
5226 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5227 arelent *p;
5228 long count, i;
5229 bfd_vma *plt_sym_val;
5230 bfd_vma plt_offset;
5231 bfd_byte *plt_contents;
5232 const struct elf_i386_backend_data *bed
5233 = get_elf_i386_backend_data (abfd);
5234 Elf_Internal_Shdr *hdr;
5235
5236 /* Get the .plt section contents. */
5237 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5238 if (plt_contents == NULL)
5239 return NULL;
5240 if (!bfd_get_section_contents (abfd, (asection *) plt,
5241 plt_contents, 0, plt->size))
5242 {
5243 bad_return:
5244 free (plt_contents);
5245 return NULL;
5246 }
5247
5248 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5249 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5250 goto bad_return;
5251
5252 hdr = &elf_section_data (relplt)->this_hdr;
5253 count = relplt->size / hdr->sh_entsize;
5254
5255 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5256 if (plt_sym_val == NULL)
5257 goto bad_return;
5258
5259 for (i = 0; i < count; i++)
5260 plt_sym_val[i] = -1;
5261
5262 plt_offset = bed->plt->plt_entry_size;
5263 p = relplt->relocation;
5264 for (i = 0; i < count; i++, p++)
5265 {
5266 long reloc_index;
5267
5268 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5269 if (p->howto == NULL)
5270 continue;
5271
5272 if (p->howto->type != R_386_JUMP_SLOT
5273 && p->howto->type != R_386_IRELATIVE)
5274 continue;
5275
5276 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5277 + bed->plt->plt_reloc_offset));
5278 reloc_index /= sizeof (Elf32_External_Rel);
5279 if (reloc_index >= count)
5280 abort ();
5281 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5282 plt_offset += bed->plt->plt_entry_size;
5283
5284 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5285 section. */
5286 if (plt_offset >= plt->size)
5287 break;
5288 }
5289
5290 free (plt_contents);
5291
5292 return plt_sym_val;
5293 }
5294
5295 /* Similar to _bfd_elf_get_synthetic_symtab. */
5296
5297 static long
5298 elf_i386_get_synthetic_symtab (bfd *abfd,
5299 long symcount,
5300 asymbol **syms,
5301 long dynsymcount,
5302 asymbol **dynsyms,
5303 asymbol **ret)
5304 {
5305 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5306 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5307 dynsymcount, dynsyms, ret,
5308 plt,
5309 elf_i386_get_plt_sym_val);
5310 }
5311
5312 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5313
5314 static bfd_boolean
5315 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5316 {
5317 if (h->plt.offset != (bfd_vma) -1
5318 && !h->def_regular
5319 && !h->pointer_equality_needed)
5320 return FALSE;
5321
5322 return _bfd_elf_hash_symbol (h);
5323 }
5324
5325 /* Hook called by the linker routine which adds symbols from an object
5326 file. */
5327
5328 static bfd_boolean
5329 elf_i386_add_symbol_hook (bfd * abfd,
5330 struct bfd_link_info * info,
5331 Elf_Internal_Sym * sym,
5332 const char ** namep ATTRIBUTE_UNUSED,
5333 flagword * flagsp ATTRIBUTE_UNUSED,
5334 asection ** secp ATTRIBUTE_UNUSED,
5335 bfd_vma * valp ATTRIBUTE_UNUSED)
5336 {
5337 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5338 && (abfd->flags & DYNAMIC) == 0
5339 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5340 elf_tdata (info->output_bfd)->has_gnu_symbols
5341 |= elf_gnu_symbol_unique;
5342
5343 return TRUE;
5344 }
5345
5346 #define TARGET_LITTLE_SYM i386_elf32_vec
5347 #define TARGET_LITTLE_NAME "elf32-i386"
5348 #define ELF_ARCH bfd_arch_i386
5349 #define ELF_TARGET_ID I386_ELF_DATA
5350 #define ELF_MACHINE_CODE EM_386
5351 #define ELF_MAXPAGESIZE 0x1000
5352
5353 #define elf_backend_can_gc_sections 1
5354 #define elf_backend_can_refcount 1
5355 #define elf_backend_want_got_plt 1
5356 #define elf_backend_plt_readonly 1
5357 #define elf_backend_want_plt_sym 0
5358 #define elf_backend_got_header_size 12
5359 #define elf_backend_plt_alignment 4
5360 #define elf_backend_extern_protected_data 1
5361
5362 /* Support RELA for objdump of prelink objects. */
5363 #define elf_info_to_howto elf_i386_info_to_howto_rel
5364 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5365
5366 #define bfd_elf32_mkobject elf_i386_mkobject
5367
5368 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5369 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5370 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5371 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5372 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5373
5374 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5375 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5376 #define elf_backend_check_relocs elf_i386_check_relocs
5377 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5378 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5379 #define elf_backend_fake_sections elf_i386_fake_sections
5380 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5381 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5382 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5383 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5384 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5385 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5386 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5387 #define elf_backend_relocate_section elf_i386_relocate_section
5388 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5389 #define elf_backend_always_size_sections elf_i386_always_size_sections
5390 #define elf_backend_omit_section_dynsym \
5391 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5392 #define elf_backend_hash_symbol elf_i386_hash_symbol
5393 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5394
5395 #include "elf32-target.h"
5396
5397 /* FreeBSD support. */
5398
5399 #undef TARGET_LITTLE_SYM
5400 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5401 #undef TARGET_LITTLE_NAME
5402 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5403 #undef ELF_OSABI
5404 #define ELF_OSABI ELFOSABI_FREEBSD
5405
5406 /* The kernel recognizes executables as valid only if they carry a
5407 "FreeBSD" label in the ELF header. So we put this label on all
5408 executables and (for simplicity) also all other object files. */
5409
5410 static void
5411 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5412 {
5413 _bfd_elf_post_process_headers (abfd, info);
5414
5415 #ifdef OLD_FREEBSD_ABI_LABEL
5416 {
5417 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5418 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5419 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5420 }
5421 #endif
5422 }
5423
5424 #undef elf_backend_post_process_headers
5425 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5426 #undef elf32_bed
5427 #define elf32_bed elf32_i386_fbsd_bed
5428
5429 #undef elf_backend_add_symbol_hook
5430
5431 #include "elf32-target.h"
5432
5433 /* Solaris 2. */
5434
5435 #undef TARGET_LITTLE_SYM
5436 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5437 #undef TARGET_LITTLE_NAME
5438 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5439
5440 #undef elf_backend_post_process_headers
5441
5442 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5443 objects won't be recognized. */
5444 #undef ELF_OSABI
5445
5446 #undef elf32_bed
5447 #define elf32_bed elf32_i386_sol2_bed
5448
5449 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5450 boundary. */
5451 #undef elf_backend_static_tls_alignment
5452 #define elf_backend_static_tls_alignment 8
5453
5454 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5455
5456 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5457 File, p.63. */
5458 #undef elf_backend_want_plt_sym
5459 #define elf_backend_want_plt_sym 1
5460
5461 #include "elf32-target.h"
5462
5463 /* Intel MCU support. */
5464
5465 static bfd_boolean
5466 elf32_iamcu_elf_object_p (bfd *abfd)
5467 {
5468 /* Set the right machine number for an IAMCU elf32 file. */
5469 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5470 return TRUE;
5471 }
5472
5473 #undef TARGET_LITTLE_SYM
5474 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5475 #undef TARGET_LITTLE_NAME
5476 #define TARGET_LITTLE_NAME "elf32-iamcu"
5477 #undef ELF_ARCH
5478 #define ELF_ARCH bfd_arch_iamcu
5479
5480 #undef ELF_MACHINE_CODE
5481 #define ELF_MACHINE_CODE EM_IAMCU
5482
5483 #undef ELF_OSABI
5484
5485 #undef elf32_bed
5486 #define elf32_bed elf32_iamcu_bed
5487
5488 #undef elf_backend_object_p
5489 #define elf_backend_object_p elf32_iamcu_elf_object_p
5490
5491 #undef elf_backend_static_tls_alignment
5492
5493 #undef elf_backend_want_plt_sym
5494 #define elf_backend_want_plt_sym 0
5495
5496 #include "elf32-target.h"
5497
5498 /* Restore defaults. */
5499 #undef ELF_ARCH
5500 #define ELF_ARCH bfd_arch_i386
5501 #undef ELF_MACHINE_CODE
5502 #define ELF_MACHINE_CODE EM_386
5503
5504 /* Native Client support. */
5505
5506 #undef TARGET_LITTLE_SYM
5507 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5508 #undef TARGET_LITTLE_NAME
5509 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5510 #undef elf32_bed
5511 #define elf32_bed elf32_i386_nacl_bed
5512
5513 #undef ELF_MAXPAGESIZE
5514 #define ELF_MAXPAGESIZE 0x10000
5515
5516 /* Restore defaults. */
5517 #undef ELF_OSABI
5518 #undef elf_backend_want_plt_sym
5519 #define elf_backend_want_plt_sym 0
5520 #undef elf_backend_post_process_headers
5521 #undef elf_backend_static_tls_alignment
5522
5523 /* NaCl uses substantially different PLT entries for the same effects. */
5524
5525 #undef elf_backend_plt_alignment
5526 #define elf_backend_plt_alignment 5
5527 #define NACL_PLT_ENTRY_SIZE 64
5528 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5529
5530 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5531 {
5532 0xff, 0x35, /* pushl contents of address */
5533 0, 0, 0, 0, /* replaced with address of .got + 4. */
5534 0x8b, 0x0d, /* movl contents of address, %ecx */
5535 0, 0, 0, 0, /* replaced with address of .got + 8. */
5536 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5537 0xff, 0xe1 /* jmp *%ecx */
5538 };
5539
5540 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5541 {
5542 0x8b, 0x0d, /* movl contents of address, %ecx */
5543 0, 0, 0, 0, /* replaced with GOT slot address. */
5544 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5545 0xff, 0xe1, /* jmp *%ecx */
5546
5547 /* Pad to the next 32-byte boundary with nop instructions. */
5548 0x90,
5549 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5550 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5551
5552 /* Lazy GOT entries point here (32-byte aligned). */
5553 0x68, /* pushl immediate */
5554 0, 0, 0, 0, /* replaced with reloc offset. */
5555 0xe9, /* jmp relative */
5556 0, 0, 0, 0, /* replaced with offset to .plt. */
5557
5558 /* Pad to the next 32-byte boundary with nop instructions. */
5559 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5560 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5561 0x90, 0x90
5562 };
5563
5564 static const bfd_byte
5565 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5566 {
5567 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5568 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5569 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5570 0xff, 0xe1, /* jmp *%ecx */
5571
5572 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5573 so pad to that size with nop instructions. */
5574 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5575 };
5576
5577 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5578 {
5579 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5580 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5581 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5582 0xff, 0xe1, /* jmp *%ecx */
5583
5584 /* Pad to the next 32-byte boundary with nop instructions. */
5585 0x90,
5586 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5587 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5588
5589 /* Lazy GOT entries point here (32-byte aligned). */
5590 0x68, /* pushl immediate */
5591 0, 0, 0, 0, /* replaced with offset into relocation table. */
5592 0xe9, /* jmp relative */
5593 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5594
5595 /* Pad to the next 32-byte boundary with nop instructions. */
5596 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5597 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5598 0x90, 0x90
5599 };
5600
5601 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5602 {
5603 #if (PLT_CIE_LENGTH != 20 \
5604 || PLT_FDE_LENGTH != 36 \
5605 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5606 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5607 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5608 #endif
5609 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5610 0, 0, 0, 0, /* CIE ID */
5611 1, /* CIE version */
5612 'z', 'R', 0, /* Augmentation string */
5613 1, /* Code alignment factor */
5614 0x7c, /* Data alignment factor: -4 */
5615 8, /* Return address column */
5616 1, /* Augmentation size */
5617 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5618 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5619 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5620 DW_CFA_nop, DW_CFA_nop,
5621
5622 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5623 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5624 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5625 0, 0, 0, 0, /* .plt size goes here */
5626 0, /* Augmentation size */
5627 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5628 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5629 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5630 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5631 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5632 13, /* Block length */
5633 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5634 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5635 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5636 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5637 DW_CFA_nop, DW_CFA_nop
5638 };
5639
5640 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5641 {
5642 elf_i386_nacl_plt0_entry, /* plt0_entry */
5643 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5644 2, /* plt0_got1_offset */
5645 8, /* plt0_got2_offset */
5646 elf_i386_nacl_plt_entry, /* plt_entry */
5647 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5648 2, /* plt_got_offset */
5649 33, /* plt_reloc_offset */
5650 38, /* plt_plt_offset */
5651 32, /* plt_lazy_offset */
5652 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5653 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5654 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5655 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5656 };
5657
5658 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5659 {
5660 &elf_i386_nacl_plt, /* plt */
5661 0x90, /* plt0_pad_byte: nop insn */
5662 0, /* is_vxworks */
5663 };
5664
5665 static bfd_boolean
5666 elf32_i386_nacl_elf_object_p (bfd *abfd)
5667 {
5668 /* Set the right machine number for a NaCl i386 ELF32 file. */
5669 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5670 return TRUE;
5671 }
5672
5673 #undef elf_backend_arch_data
5674 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5675
5676 #undef elf_backend_object_p
5677 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5678 #undef elf_backend_modify_segment_map
5679 #define elf_backend_modify_segment_map nacl_modify_segment_map
5680 #undef elf_backend_modify_program_headers
5681 #define elf_backend_modify_program_headers nacl_modify_program_headers
5682 #undef elf_backend_final_write_processing
5683 #define elf_backend_final_write_processing nacl_final_write_processing
5684
5685 #include "elf32-target.h"
5686
5687 /* Restore defaults. */
5688 #undef elf_backend_object_p
5689 #undef elf_backend_modify_segment_map
5690 #undef elf_backend_modify_program_headers
5691 #undef elf_backend_final_write_processing
5692
5693 /* VxWorks support. */
5694
5695 #undef TARGET_LITTLE_SYM
5696 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5697 #undef TARGET_LITTLE_NAME
5698 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5699 #undef ELF_OSABI
5700 #undef elf_backend_plt_alignment
5701 #define elf_backend_plt_alignment 4
5702
5703 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5704 {
5705 &elf_i386_plt, /* plt */
5706 0x90, /* plt0_pad_byte */
5707 1, /* is_vxworks */
5708 };
5709
5710 #undef elf_backend_arch_data
5711 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5712
5713 #undef elf_backend_relocs_compatible
5714 #undef elf_backend_add_symbol_hook
5715 #define elf_backend_add_symbol_hook \
5716 elf_vxworks_add_symbol_hook
5717 #undef elf_backend_link_output_symbol_hook
5718 #define elf_backend_link_output_symbol_hook \
5719 elf_vxworks_link_output_symbol_hook
5720 #undef elf_backend_emit_relocs
5721 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5722 #undef elf_backend_final_write_processing
5723 #define elf_backend_final_write_processing \
5724 elf_vxworks_final_write_processing
5725 #undef elf_backend_static_tls_alignment
5726
5727 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5728 define it. */
5729 #undef elf_backend_want_plt_sym
5730 #define elf_backend_want_plt_sym 1
5731
5732 #undef elf32_bed
5733 #define elf32_bed elf32_i386_vxworks_bed
5734
5735 #include "elf32-target.h"
GDB Binutils - Deliverables
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