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