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Fixes a compile time warnng about left shifting a negative value.
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32
33 /* 386 uses REL relocations instead of RELA. */
34 #define USE_REL 1
35
36 #include "elf/i386.h"
37
38 static reloc_howto_type elf_howto_table[]=
39 {
40 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
73
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
112
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
135 bfd_elf_generic_reloc, "R_386_SIZE32",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_VTABLE_INHERIT:
336 TRACE ("BFD_RELOC_VTABLE_INHERIT");
337 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
338
339 case BFD_RELOC_VTABLE_ENTRY:
340 TRACE ("BFD_RELOC_VTABLE_ENTRY");
341 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
342
343 default:
344 break;
345 }
346
347 TRACE ("Unknown");
348 return 0;
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_irelative - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
376 >= R_386_vt - R_386_irelative))
377 {
378 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
379 abfd, (int) r_type);
380 indx = R_386_NONE;
381 }
382 /* PR 17512: file: 0f67f69d. */
383 if (elf_howto_table [indx].type != r_type)
384 return NULL;
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* Entries in the GOT procedure linkage table look like this. */
586
587 static const bfd_byte elf_i386_got_plt_entry[8] =
588 {
589 0xff, 0x25, /* jmp indirect */
590 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
591 0x66, 0x90 /* xchg %ax,%ax */
592 };
593
594 /* Entries in the PIC GOT procedure linkage table look like this. */
595
596 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
597 {
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* .eh_frame covering the .plt section. */
604
605 static const bfd_byte elf_i386_eh_frame_plt[] =
606 {
607 #define PLT_CIE_LENGTH 20
608 #define PLT_FDE_LENGTH 36
609 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
610 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
611 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
612 0, 0, 0, 0, /* CIE ID */
613 1, /* CIE version */
614 'z', 'R', 0, /* Augmentation string */
615 1, /* Code alignment factor */
616 0x7c, /* Data alignment factor */
617 8, /* Return address column */
618 1, /* Augmentation size */
619 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
620 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
621 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
622 DW_CFA_nop, DW_CFA_nop,
623
624 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
625 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
626 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
627 0, 0, 0, 0, /* .plt size goes here */
628 0, /* Augmentation size */
629 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
630 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
631 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
632 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
633 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
634 11, /* Block length */
635 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
636 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
637 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
638 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
639 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
640 };
641
642 struct elf_i386_plt_layout
643 {
644 /* The first entry in an absolute procedure linkage table looks like this. */
645 const bfd_byte *plt0_entry;
646 unsigned int plt0_entry_size;
647
648 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
649 unsigned int plt0_got1_offset;
650 unsigned int plt0_got2_offset;
651
652 /* Later entries in an absolute procedure linkage table look like this. */
653 const bfd_byte *plt_entry;
654 unsigned int plt_entry_size;
655
656 /* Offsets into plt_entry that are to be replaced with... */
657 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
658 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
659 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
660
661 /* Offset into plt_entry where the initial value of the GOT entry points. */
662 unsigned int plt_lazy_offset;
663
664 /* The first entry in a PIC procedure linkage table looks like this. */
665 const bfd_byte *pic_plt0_entry;
666
667 /* Subsequent entries in a PIC procedure linkage table look like this. */
668 const bfd_byte *pic_plt_entry;
669
670 /* .eh_frame covering the .plt section. */
671 const bfd_byte *eh_frame_plt;
672 unsigned int eh_frame_plt_size;
673 };
674
675 #define GET_PLT_ENTRY_SIZE(abfd) \
676 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
677
678 /* These are the standard parameters. */
679 static const struct elf_i386_plt_layout elf_i386_plt =
680 {
681 elf_i386_plt0_entry, /* plt0_entry */
682 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
683 2, /* plt0_got1_offset */
684 8, /* plt0_got2_offset */
685 elf_i386_plt_entry, /* plt_entry */
686 PLT_ENTRY_SIZE, /* plt_entry_size */
687 2, /* plt_got_offset */
688 7, /* plt_reloc_offset */
689 12, /* plt_plt_offset */
690 6, /* plt_lazy_offset */
691 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
692 elf_i386_pic_plt_entry, /* pic_plt_entry */
693 elf_i386_eh_frame_plt, /* eh_frame_plt */
694 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
695 };
696 \f
697
698 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
699 for the PLTResolve stub and then for each PLT entry. */
700 #define PLTRESOLVE_RELOCS_SHLIB 0
701 #define PLTRESOLVE_RELOCS 2
702 #define PLT_NON_JUMP_SLOT_RELOCS 2
703
704 /* Architecture-specific backend data for i386. */
705
706 struct elf_i386_backend_data
707 {
708 /* Parameters describing PLT generation. */
709 const struct elf_i386_plt_layout *plt;
710
711 /* Value used to fill the unused bytes of the first PLT entry. */
712 bfd_byte plt0_pad_byte;
713
714 /* True if the target system is VxWorks. */
715 int is_vxworks;
716 };
717
718 #define get_elf_i386_backend_data(abfd) \
719 ((const struct elf_i386_backend_data *) \
720 get_elf_backend_data (abfd)->arch_data)
721
722 /* These are the standard parameters. */
723 static const struct elf_i386_backend_data elf_i386_arch_bed =
724 {
725 &elf_i386_plt, /* plt */
726 0, /* plt0_pad_byte */
727 0, /* is_vxworks */
728 };
729
730 #define elf_backend_arch_data &elf_i386_arch_bed
731
732 /* i386 ELF linker hash entry. */
733
734 struct elf_i386_link_hash_entry
735 {
736 struct elf_link_hash_entry elf;
737
738 /* Track dynamic relocs copied for this symbol. */
739 struct elf_dyn_relocs *dyn_relocs;
740
741 #define GOT_UNKNOWN 0
742 #define GOT_NORMAL 1
743 #define GOT_TLS_GD 2
744 #define GOT_TLS_IE 4
745 #define GOT_TLS_IE_POS 5
746 #define GOT_TLS_IE_NEG 6
747 #define GOT_TLS_IE_BOTH 7
748 #define GOT_TLS_GDESC 8
749 #define GOT_TLS_GD_BOTH_P(type) \
750 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
751 #define GOT_TLS_GD_P(type) \
752 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
753 #define GOT_TLS_GDESC_P(type) \
754 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
755 #define GOT_TLS_GD_ANY_P(type) \
756 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
757 unsigned char tls_type;
758
759 /* Symbol is referenced by R_386_GOTOFF relocation. */
760 unsigned int gotoff_ref : 1;
761
762 /* Information about the GOT PLT entry. Filled when there are both
763 GOT and PLT relocations against the same function. */
764 union gotplt_union plt_got;
765
766 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
767 starting at the end of the jump table. */
768 bfd_vma tlsdesc_got;
769 };
770
771 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
772
773 struct elf_i386_obj_tdata
774 {
775 struct elf_obj_tdata root;
776
777 /* tls_type for each local got entry. */
778 char *local_got_tls_type;
779
780 /* GOTPLT entries for TLS descriptors. */
781 bfd_vma *local_tlsdesc_gotent;
782 };
783
784 #define elf_i386_tdata(abfd) \
785 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
786
787 #define elf_i386_local_got_tls_type(abfd) \
788 (elf_i386_tdata (abfd)->local_got_tls_type)
789
790 #define elf_i386_local_tlsdesc_gotent(abfd) \
791 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
792
793 #define is_i386_elf(bfd) \
794 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
795 && elf_tdata (bfd) != NULL \
796 && elf_object_id (bfd) == I386_ELF_DATA)
797
798 static bfd_boolean
799 elf_i386_mkobject (bfd *abfd)
800 {
801 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
802 I386_ELF_DATA);
803 }
804
805 /* i386 ELF linker hash table. */
806
807 struct elf_i386_link_hash_table
808 {
809 struct elf_link_hash_table elf;
810
811 /* Short-cuts to get to dynamic linker sections. */
812 asection *sdynbss;
813 asection *srelbss;
814 asection *plt_eh_frame;
815 asection *plt_got;
816
817 union
818 {
819 bfd_signed_vma refcount;
820 bfd_vma offset;
821 } tls_ldm_got;
822
823 /* The amount of space used by the reserved portion of the sgotplt
824 section, plus whatever space is used by the jump slots. */
825 bfd_vma sgotplt_jump_table_size;
826
827 /* Small local sym cache. */
828 struct sym_cache sym_cache;
829
830 /* _TLS_MODULE_BASE_ symbol. */
831 struct bfd_link_hash_entry *tls_module_base;
832
833 /* Used by local STT_GNU_IFUNC symbols. */
834 htab_t loc_hash_table;
835 void * loc_hash_memory;
836
837 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
838 asection *srelplt2;
839
840 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
841 bfd_vma next_tls_desc_index;
842
843 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
844 bfd_vma next_jump_slot_index;
845
846 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
847 bfd_vma next_irelative_index;
848 };
849
850 /* Get the i386 ELF linker hash table from a link_info structure. */
851
852 #define elf_i386_hash_table(p) \
853 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
854 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
855
856 #define elf_i386_compute_jump_table_size(htab) \
857 ((htab)->elf.srelplt->reloc_count * 4)
858
859 /* Create an entry in an i386 ELF linker hash table. */
860
861 static struct bfd_hash_entry *
862 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
863 struct bfd_hash_table *table,
864 const char *string)
865 {
866 /* Allocate the structure if it has not already been allocated by a
867 subclass. */
868 if (entry == NULL)
869 {
870 entry = (struct bfd_hash_entry *)
871 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
872 if (entry == NULL)
873 return entry;
874 }
875
876 /* Call the allocation method of the superclass. */
877 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
878 if (entry != NULL)
879 {
880 struct elf_i386_link_hash_entry *eh;
881
882 eh = (struct elf_i386_link_hash_entry *) entry;
883 eh->dyn_relocs = NULL;
884 eh->tls_type = GOT_UNKNOWN;
885 eh->gotoff_ref = 0;
886 eh->plt_got.offset = (bfd_vma) -1;
887 eh->tlsdesc_got = (bfd_vma) -1;
888 }
889
890 return entry;
891 }
892
893 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
894 for local symbol so that we can handle local STT_GNU_IFUNC symbols
895 as global symbol. We reuse indx and dynstr_index for local symbol
896 hash since they aren't used by global symbols in this backend. */
897
898 static hashval_t
899 elf_i386_local_htab_hash (const void *ptr)
900 {
901 struct elf_link_hash_entry *h
902 = (struct elf_link_hash_entry *) ptr;
903 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
904 }
905
906 /* Compare local hash entries. */
907
908 static int
909 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
910 {
911 struct elf_link_hash_entry *h1
912 = (struct elf_link_hash_entry *) ptr1;
913 struct elf_link_hash_entry *h2
914 = (struct elf_link_hash_entry *) ptr2;
915
916 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
917 }
918
919 /* Find and/or create a hash entry for local symbol. */
920
921 static struct elf_link_hash_entry *
922 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
923 bfd *abfd, const Elf_Internal_Rela *rel,
924 bfd_boolean create)
925 {
926 struct elf_i386_link_hash_entry e, *ret;
927 asection *sec = abfd->sections;
928 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
929 ELF32_R_SYM (rel->r_info));
930 void **slot;
931
932 e.elf.indx = sec->id;
933 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
934 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
935 create ? INSERT : NO_INSERT);
936
937 if (!slot)
938 return NULL;
939
940 if (*slot)
941 {
942 ret = (struct elf_i386_link_hash_entry *) *slot;
943 return &ret->elf;
944 }
945
946 ret = (struct elf_i386_link_hash_entry *)
947 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
948 sizeof (struct elf_i386_link_hash_entry));
949 if (ret)
950 {
951 memset (ret, 0, sizeof (*ret));
952 ret->elf.indx = sec->id;
953 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
954 ret->elf.dynindx = -1;
955 ret->plt_got.offset = (bfd_vma) -1;
956 *slot = ret;
957 }
958 return &ret->elf;
959 }
960
961 /* Destroy an i386 ELF linker hash table. */
962
963 static void
964 elf_i386_link_hash_table_free (bfd *obfd)
965 {
966 struct elf_i386_link_hash_table *htab
967 = (struct elf_i386_link_hash_table *) obfd->link.hash;
968
969 if (htab->loc_hash_table)
970 htab_delete (htab->loc_hash_table);
971 if (htab->loc_hash_memory)
972 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
973 _bfd_elf_link_hash_table_free (obfd);
974 }
975
976 /* Create an i386 ELF linker hash table. */
977
978 static struct bfd_link_hash_table *
979 elf_i386_link_hash_table_create (bfd *abfd)
980 {
981 struct elf_i386_link_hash_table *ret;
982 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
983
984 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
985 if (ret == NULL)
986 return NULL;
987
988 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
989 elf_i386_link_hash_newfunc,
990 sizeof (struct elf_i386_link_hash_entry),
991 I386_ELF_DATA))
992 {
993 free (ret);
994 return NULL;
995 }
996
997 ret->loc_hash_table = htab_try_create (1024,
998 elf_i386_local_htab_hash,
999 elf_i386_local_htab_eq,
1000 NULL);
1001 ret->loc_hash_memory = objalloc_create ();
1002 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1003 {
1004 elf_i386_link_hash_table_free (abfd);
1005 return NULL;
1006 }
1007 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1008
1009 return &ret->elf.root;
1010 }
1011
1012 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1013 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1014 hash table. */
1015
1016 static bfd_boolean
1017 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1018 {
1019 struct elf_i386_link_hash_table *htab;
1020
1021 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1022 return FALSE;
1023
1024 htab = elf_i386_hash_table (info);
1025 if (htab == NULL)
1026 return FALSE;
1027
1028 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1029 if (!htab->sdynbss)
1030 abort ();
1031
1032 if (info->executable)
1033 {
1034 /* Always allow copy relocs for building executables. */
1035 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1036 if (s == NULL)
1037 {
1038 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1039 s = bfd_make_section_anyway_with_flags (dynobj,
1040 ".rel.bss",
1041 (bed->dynamic_sec_flags
1042 | SEC_READONLY));
1043 if (s == NULL
1044 || ! bfd_set_section_alignment (dynobj, s,
1045 bed->s->log_file_align))
1046 return FALSE;
1047 }
1048 htab->srelbss = s;
1049 }
1050
1051 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1052 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1053 &htab->srelplt2))
1054 return FALSE;
1055
1056 if (!info->no_ld_generated_unwind_info
1057 && htab->plt_eh_frame == NULL
1058 && htab->elf.splt != NULL)
1059 {
1060 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1061 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED);
1063 htab->plt_eh_frame
1064 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1065 if (htab->plt_eh_frame == NULL
1066 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1067 return FALSE;
1068 }
1069
1070 return TRUE;
1071 }
1072
1073 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1074
1075 static void
1076 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1077 struct elf_link_hash_entry *dir,
1078 struct elf_link_hash_entry *ind)
1079 {
1080 struct elf_i386_link_hash_entry *edir, *eind;
1081
1082 edir = (struct elf_i386_link_hash_entry *) dir;
1083 eind = (struct elf_i386_link_hash_entry *) ind;
1084
1085 if (eind->dyn_relocs != NULL)
1086 {
1087 if (edir->dyn_relocs != NULL)
1088 {
1089 struct elf_dyn_relocs **pp;
1090 struct elf_dyn_relocs *p;
1091
1092 /* Add reloc counts against the indirect sym to the direct sym
1093 list. Merge any entries against the same section. */
1094 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1095 {
1096 struct elf_dyn_relocs *q;
1097
1098 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1099 if (q->sec == p->sec)
1100 {
1101 q->pc_count += p->pc_count;
1102 q->count += p->count;
1103 *pp = p->next;
1104 break;
1105 }
1106 if (q == NULL)
1107 pp = &p->next;
1108 }
1109 *pp = edir->dyn_relocs;
1110 }
1111
1112 edir->dyn_relocs = eind->dyn_relocs;
1113 eind->dyn_relocs = NULL;
1114 }
1115
1116 if (ind->root.type == bfd_link_hash_indirect
1117 && dir->got.refcount <= 0)
1118 {
1119 edir->tls_type = eind->tls_type;
1120 eind->tls_type = GOT_UNKNOWN;
1121 }
1122
1123 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1124 generate a R_386_COPY reloc. */
1125 edir->gotoff_ref |= eind->gotoff_ref;
1126
1127 if (ELIMINATE_COPY_RELOCS
1128 && ind->root.type != bfd_link_hash_indirect
1129 && dir->dynamic_adjusted)
1130 {
1131 /* If called to transfer flags for a weakdef during processing
1132 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1133 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1134 dir->ref_dynamic |= ind->ref_dynamic;
1135 dir->ref_regular |= ind->ref_regular;
1136 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1137 dir->needs_plt |= ind->needs_plt;
1138 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1139 }
1140 else
1141 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1142 }
1143
1144 /* Return TRUE if the TLS access code sequence support transition
1145 from R_TYPE. */
1146
1147 static bfd_boolean
1148 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1149 bfd_byte *contents,
1150 Elf_Internal_Shdr *symtab_hdr,
1151 struct elf_link_hash_entry **sym_hashes,
1152 unsigned int r_type,
1153 const Elf_Internal_Rela *rel,
1154 const Elf_Internal_Rela *relend)
1155 {
1156 unsigned int val, type;
1157 unsigned long r_symndx;
1158 struct elf_link_hash_entry *h;
1159 bfd_vma offset;
1160
1161 /* Get the section contents. */
1162 if (contents == NULL)
1163 {
1164 if (elf_section_data (sec)->this_hdr.contents != NULL)
1165 contents = elf_section_data (sec)->this_hdr.contents;
1166 else
1167 {
1168 /* FIXME: How to better handle error condition? */
1169 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1170 return FALSE;
1171
1172 /* Cache the section contents for elf_link_input_bfd. */
1173 elf_section_data (sec)->this_hdr.contents = contents;
1174 }
1175 }
1176
1177 offset = rel->r_offset;
1178 switch (r_type)
1179 {
1180 case R_386_TLS_GD:
1181 case R_386_TLS_LDM:
1182 if (offset < 2 || (rel + 1) >= relend)
1183 return FALSE;
1184
1185 type = bfd_get_8 (abfd, contents + offset - 2);
1186 if (r_type == R_386_TLS_GD)
1187 {
1188 /* Check transition from GD access model. Only
1189 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1190 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1191 can transit to different access model. */
1192 if ((offset + 10) > sec->size ||
1193 (type != 0x8d && type != 0x04))
1194 return FALSE;
1195
1196 val = bfd_get_8 (abfd, contents + offset - 1);
1197 if (type == 0x04)
1198 {
1199 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1200 if (offset < 3)
1201 return FALSE;
1202
1203 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1204 return FALSE;
1205
1206 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1207 return FALSE;
1208 }
1209 else
1210 {
1211 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1212 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1213 return FALSE;
1214
1215 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1216 return FALSE;
1217 }
1218 }
1219 else
1220 {
1221 /* Check transition from LD access model. Only
1222 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1223 can transit to different access model. */
1224 if (type != 0x8d || (offset + 9) > sec->size)
1225 return FALSE;
1226
1227 val = bfd_get_8 (abfd, contents + offset - 1);
1228 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1229 return FALSE;
1230 }
1231
1232 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1233 return FALSE;
1234
1235 r_symndx = ELF32_R_SYM (rel[1].r_info);
1236 if (r_symndx < symtab_hdr->sh_info)
1237 return FALSE;
1238
1239 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1240 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1241 may be versioned. */
1242 return (h != NULL
1243 && h->root.root.string != NULL
1244 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1245 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1246 && (strncmp (h->root.root.string, "___tls_get_addr",
1247 15) == 0));
1248
1249 case R_386_TLS_IE:
1250 /* Check transition from IE access model:
1251 movl foo@indntpoff(%rip), %eax
1252 movl foo@indntpoff(%rip), %reg
1253 addl foo@indntpoff(%rip), %reg
1254 */
1255
1256 if (offset < 1 || (offset + 4) > sec->size)
1257 return FALSE;
1258
1259 /* Check "movl foo@tpoff(%rip), %eax" first. */
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1261 if (val == 0xa1)
1262 return TRUE;
1263
1264 if (offset < 2)
1265 return FALSE;
1266
1267 /* Check movl|addl foo@tpoff(%rip), %reg. */
1268 type = bfd_get_8 (abfd, contents + offset - 2);
1269 return ((type == 0x8b || type == 0x03)
1270 && (val & 0xc7) == 0x05);
1271
1272 case R_386_TLS_GOTIE:
1273 case R_386_TLS_IE_32:
1274 /* Check transition from {IE_32,GOTIE} access model:
1275 subl foo@{tpoff,gontoff}(%reg1), %reg2
1276 movl foo@{tpoff,gontoff}(%reg1), %reg2
1277 addl foo@{tpoff,gontoff}(%reg1), %reg2
1278 */
1279
1280 if (offset < 2 || (offset + 4) > sec->size)
1281 return FALSE;
1282
1283 val = bfd_get_8 (abfd, contents + offset - 1);
1284 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1285 return FALSE;
1286
1287 type = bfd_get_8 (abfd, contents + offset - 2);
1288 return type == 0x8b || type == 0x2b || type == 0x03;
1289
1290 case R_386_TLS_GOTDESC:
1291 /* Check transition from GDesc access model:
1292 leal x@tlsdesc(%ebx), %eax
1293
1294 Make sure it's a leal adding ebx to a 32-bit offset
1295 into any register, although it's probably almost always
1296 going to be eax. */
1297
1298 if (offset < 2 || (offset + 4) > sec->size)
1299 return FALSE;
1300
1301 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1302 return FALSE;
1303
1304 val = bfd_get_8 (abfd, contents + offset - 1);
1305 return (val & 0xc7) == 0x83;
1306
1307 case R_386_TLS_DESC_CALL:
1308 /* Check transition from GDesc access model:
1309 call *x@tlsdesc(%rax)
1310 */
1311 if (offset + 2 <= sec->size)
1312 {
1313 /* Make sure that it's a call *x@tlsdesc(%rax). */
1314 static const unsigned char call[] = { 0xff, 0x10 };
1315 return memcmp (contents + offset, call, 2) == 0;
1316 }
1317
1318 return FALSE;
1319
1320 default:
1321 abort ();
1322 }
1323 }
1324
1325 /* Return TRUE if the TLS access transition is OK or no transition
1326 will be performed. Update R_TYPE if there is a transition. */
1327
1328 static bfd_boolean
1329 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1330 asection *sec, bfd_byte *contents,
1331 Elf_Internal_Shdr *symtab_hdr,
1332 struct elf_link_hash_entry **sym_hashes,
1333 unsigned int *r_type, int tls_type,
1334 const Elf_Internal_Rela *rel,
1335 const Elf_Internal_Rela *relend,
1336 struct elf_link_hash_entry *h,
1337 unsigned long r_symndx)
1338 {
1339 unsigned int from_type = *r_type;
1340 unsigned int to_type = from_type;
1341 bfd_boolean check = TRUE;
1342
1343 /* Skip TLS transition for functions. */
1344 if (h != NULL
1345 && (h->type == STT_FUNC
1346 || h->type == STT_GNU_IFUNC))
1347 return TRUE;
1348
1349 switch (from_type)
1350 {
1351 case R_386_TLS_GD:
1352 case R_386_TLS_GOTDESC:
1353 case R_386_TLS_DESC_CALL:
1354 case R_386_TLS_IE_32:
1355 case R_386_TLS_IE:
1356 case R_386_TLS_GOTIE:
1357 if (info->executable)
1358 {
1359 if (h == NULL)
1360 to_type = R_386_TLS_LE_32;
1361 else if (from_type != R_386_TLS_IE
1362 && from_type != R_386_TLS_GOTIE)
1363 to_type = R_386_TLS_IE_32;
1364 }
1365
1366 /* When we are called from elf_i386_relocate_section, CONTENTS
1367 isn't NULL and there may be additional transitions based on
1368 TLS_TYPE. */
1369 if (contents != NULL)
1370 {
1371 unsigned int new_to_type = to_type;
1372
1373 if (info->executable
1374 && h != NULL
1375 && h->dynindx == -1
1376 && (tls_type & GOT_TLS_IE))
1377 new_to_type = R_386_TLS_LE_32;
1378
1379 if (to_type == R_386_TLS_GD
1380 || to_type == R_386_TLS_GOTDESC
1381 || to_type == R_386_TLS_DESC_CALL)
1382 {
1383 if (tls_type == GOT_TLS_IE_POS)
1384 new_to_type = R_386_TLS_GOTIE;
1385 else if (tls_type & GOT_TLS_IE)
1386 new_to_type = R_386_TLS_IE_32;
1387 }
1388
1389 /* We checked the transition before when we were called from
1390 elf_i386_check_relocs. We only want to check the new
1391 transition which hasn't been checked before. */
1392 check = new_to_type != to_type && from_type == to_type;
1393 to_type = new_to_type;
1394 }
1395
1396 break;
1397
1398 case R_386_TLS_LDM:
1399 if (info->executable)
1400 to_type = R_386_TLS_LE_32;
1401 break;
1402
1403 default:
1404 return TRUE;
1405 }
1406
1407 /* Return TRUE if there is no transition. */
1408 if (from_type == to_type)
1409 return TRUE;
1410
1411 /* Check if the transition can be performed. */
1412 if (check
1413 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1414 symtab_hdr, sym_hashes,
1415 from_type, rel, relend))
1416 {
1417 reloc_howto_type *from, *to;
1418 const char *name;
1419
1420 from = elf_i386_rtype_to_howto (abfd, from_type);
1421 to = elf_i386_rtype_to_howto (abfd, to_type);
1422
1423 if (h)
1424 name = h->root.root.string;
1425 else
1426 {
1427 struct elf_i386_link_hash_table *htab;
1428
1429 htab = elf_i386_hash_table (info);
1430 if (htab == NULL)
1431 name = "*unknown*";
1432 else
1433 {
1434 Elf_Internal_Sym *isym;
1435
1436 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1437 abfd, r_symndx);
1438 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1439 }
1440 }
1441
1442 (*_bfd_error_handler)
1443 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1444 "in section `%A' failed"),
1445 abfd, sec, from->name, to->name, name,
1446 (unsigned long) rel->r_offset);
1447 bfd_set_error (bfd_error_bad_value);
1448 return FALSE;
1449 }
1450
1451 *r_type = to_type;
1452 return TRUE;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define need_convert_mov_to_lea sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bfd_boolean
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_i386_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_boolean use_plt_got;
1476
1477 if (info->relocatable)
1478 return TRUE;
1479
1480 BFD_ASSERT (is_i386_elf (abfd));
1481
1482 htab = elf_i386_hash_table (info);
1483 if (htab == NULL)
1484 return FALSE;
1485
1486 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1487 && (get_elf_i386_backend_data (abfd)
1488 == &elf_i386_arch_bed));
1489
1490 symtab_hdr = &elf_symtab_hdr (abfd);
1491 sym_hashes = elf_sym_hashes (abfd);
1492
1493 sreloc = NULL;
1494
1495 rel_end = relocs + sec->reloc_count;
1496 for (rel = relocs; rel < rel_end; rel++)
1497 {
1498 unsigned int r_type;
1499 unsigned long r_symndx;
1500 struct elf_link_hash_entry *h;
1501 struct elf_i386_link_hash_entry *eh;
1502 Elf_Internal_Sym *isym;
1503 const char *name;
1504 bfd_boolean size_reloc;
1505
1506 r_symndx = ELF32_R_SYM (rel->r_info);
1507 r_type = ELF32_R_TYPE (rel->r_info);
1508
1509 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1510 {
1511 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1512 abfd,
1513 r_symndx);
1514 return FALSE;
1515 }
1516
1517 if (r_symndx < symtab_hdr->sh_info)
1518 {
1519 /* A local symbol. */
1520 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1521 abfd, r_symndx);
1522 if (isym == NULL)
1523 return FALSE;
1524
1525 /* Check relocation against local STT_GNU_IFUNC symbol. */
1526 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1527 {
1528 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1529 if (h == NULL)
1530 return FALSE;
1531
1532 /* Fake a STT_GNU_IFUNC symbol. */
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_i386_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 /* Create the ifunc sections for static executables. If we
1555 never see an indirect function symbol nor we are building
1556 a static executable, those sections will be empty and
1557 won't appear in output. */
1558 switch (r_type)
1559 {
1560 default:
1561 break;
1562
1563 case R_386_GOTOFF:
1564 eh->gotoff_ref = 1;
1565 case R_386_32:
1566 case R_386_PC32:
1567 case R_386_PLT32:
1568 case R_386_GOT32:
1569 if (htab->elf.dynobj == NULL)
1570 htab->elf.dynobj = abfd;
1571 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1572 return FALSE;
1573 break;
1574 }
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 h->root.non_ir_ref = 1;
1579 }
1580
1581 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1582 symtab_hdr, sym_hashes,
1583 &r_type, GOT_UNKNOWN,
1584 rel, rel_end, h, r_symndx))
1585 return FALSE;
1586
1587 switch (r_type)
1588 {
1589 case R_386_TLS_LDM:
1590 htab->tls_ldm_got.refcount += 1;
1591 goto create_got;
1592
1593 case R_386_PLT32:
1594 /* This symbol requires a procedure linkage table entry. We
1595 actually build the entry in adjust_dynamic_symbol,
1596 because this might be a case of linking PIC code which is
1597 never referenced by a dynamic object, in which case we
1598 don't need to generate a procedure linkage table entry
1599 after all. */
1600
1601 /* If this is a local symbol, we resolve it directly without
1602 creating a procedure linkage table entry. */
1603 if (h == NULL)
1604 continue;
1605
1606 h->needs_plt = 1;
1607 h->plt.refcount += 1;
1608 break;
1609
1610 case R_386_SIZE32:
1611 size_reloc = TRUE;
1612 goto do_size;
1613
1614 case R_386_TLS_IE_32:
1615 case R_386_TLS_IE:
1616 case R_386_TLS_GOTIE:
1617 if (!info->executable)
1618 info->flags |= DF_STATIC_TLS;
1619 /* Fall through */
1620
1621 case R_386_GOT32:
1622 case R_386_TLS_GD:
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1626 {
1627 int tls_type, old_tls_type;
1628
1629 switch (r_type)
1630 {
1631 default:
1632 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1640 else
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1644 break;
1645 case R_386_TLS_IE:
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1648 }
1649
1650 if (h != NULL)
1651 {
1652 h->got.refcount += 1;
1653 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1654 }
1655 else
1656 {
1657 bfd_signed_vma *local_got_refcounts;
1658
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1662 {
1663 bfd_size_type size;
1664
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1671 return FALSE;
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_i386_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_i386_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1677 }
1678 local_got_refcounts[r_symndx] += 1;
1679 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1680 }
1681
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1689 {
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1695 else
1696 {
1697 if (h)
1698 name = h->root.root.string;
1699 else
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1701 NULL);
1702 (*_bfd_error_handler)
1703 (_("%B: `%s' accessed both as normal and "
1704 "thread local symbol"),
1705 abfd, name);
1706 bfd_set_error (bfd_error_bad_value);
1707 return FALSE;
1708 }
1709 }
1710
1711 if (old_tls_type != tls_type)
1712 {
1713 if (h != NULL)
1714 elf_i386_hash_entry (h)->tls_type = tls_type;
1715 else
1716 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1717 }
1718 }
1719 /* Fall through */
1720
1721 case R_386_GOTOFF:
1722 case R_386_GOTPC:
1723 create_got:
1724 if (htab->elf.sgot == NULL)
1725 {
1726 if (htab->elf.dynobj == NULL)
1727 htab->elf.dynobj = abfd;
1728 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1729 return FALSE;
1730 }
1731 if (r_type != R_386_TLS_IE)
1732 break;
1733 /* Fall through */
1734
1735 case R_386_TLS_LE_32:
1736 case R_386_TLS_LE:
1737 if (info->executable)
1738 break;
1739 info->flags |= DF_STATIC_TLS;
1740 /* Fall through */
1741
1742 case R_386_32:
1743 case R_386_PC32:
1744 if (h != NULL && info->executable)
1745 {
1746 /* If this reloc is in a read-only section, we might
1747 need a copy reloc. We can't check reliably at this
1748 stage whether the section is read-only, as input
1749 sections have not yet been mapped to output sections.
1750 Tentatively set the flag for now, and correct in
1751 adjust_dynamic_symbol. */
1752 h->non_got_ref = 1;
1753
1754 /* We may need a .plt entry if the function this reloc
1755 refers to is in a shared lib. */
1756 h->plt.refcount += 1;
1757 if (r_type != R_386_PC32)
1758 h->pointer_equality_needed = 1;
1759 }
1760
1761 size_reloc = FALSE;
1762 do_size:
1763 /* If we are creating a shared library, and this is a reloc
1764 against a global symbol, or a non PC relative reloc
1765 against a local symbol, then we need to copy the reloc
1766 into the shared library. However, if we are linking with
1767 -Bsymbolic, we do not need to copy a reloc against a
1768 global symbol which is defined in an object we are
1769 including in the link (i.e., DEF_REGULAR is set). At
1770 this point we have not seen all the input files, so it is
1771 possible that DEF_REGULAR is not set now but will be set
1772 later (it is never cleared). In case of a weak definition,
1773 DEF_REGULAR may be cleared later by a strong definition in
1774 a shared library. We account for that possibility below by
1775 storing information in the relocs_copied field of the hash
1776 table entry. A similar situation occurs when creating
1777 shared libraries and symbol visibility changes render the
1778 symbol local.
1779
1780 If on the other hand, we are creating an executable, we
1781 may need to keep relocations for symbols satisfied by a
1782 dynamic library if we manage to avoid copy relocs for the
1783 symbol. */
1784 if ((info->shared
1785 && (sec->flags & SEC_ALLOC) != 0
1786 && (r_type != R_386_PC32
1787 || (h != NULL
1788 && (! SYMBOLIC_BIND (info, h)
1789 || h->root.type == bfd_link_hash_defweak
1790 || !h->def_regular))))
1791 || (ELIMINATE_COPY_RELOCS
1792 && !info->shared
1793 && (sec->flags & SEC_ALLOC) != 0
1794 && h != NULL
1795 && (h->root.type == bfd_link_hash_defweak
1796 || !h->def_regular)))
1797 {
1798 struct elf_dyn_relocs *p;
1799 struct elf_dyn_relocs **head;
1800
1801 /* We must copy these reloc types into the output file.
1802 Create a reloc section in dynobj and make room for
1803 this reloc. */
1804 if (sreloc == NULL)
1805 {
1806 if (htab->elf.dynobj == NULL)
1807 htab->elf.dynobj = abfd;
1808
1809 sreloc = _bfd_elf_make_dynamic_reloc_section
1810 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1811
1812 if (sreloc == NULL)
1813 return FALSE;
1814 }
1815
1816 /* If this is a global symbol, we count the number of
1817 relocations we need for this symbol. */
1818 if (h != NULL)
1819 {
1820 head = &eh->dyn_relocs;
1821 }
1822 else
1823 {
1824 /* Track dynamic relocs needed for local syms too.
1825 We really need local syms available to do this
1826 easily. Oh well. */
1827 void **vpp;
1828 asection *s;
1829
1830 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1831 abfd, r_symndx);
1832 if (isym == NULL)
1833 return FALSE;
1834
1835 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1836 if (s == NULL)
1837 s = sec;
1838
1839 vpp = &elf_section_data (s)->local_dynrel;
1840 head = (struct elf_dyn_relocs **)vpp;
1841 }
1842
1843 p = *head;
1844 if (p == NULL || p->sec != sec)
1845 {
1846 bfd_size_type amt = sizeof *p;
1847 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1848 amt);
1849 if (p == NULL)
1850 return FALSE;
1851 p->next = *head;
1852 *head = p;
1853 p->sec = sec;
1854 p->count = 0;
1855 p->pc_count = 0;
1856 }
1857
1858 p->count += 1;
1859 /* Count size relocation as PC-relative relocation. */
1860 if (r_type == R_386_PC32 || size_reloc)
1861 p->pc_count += 1;
1862 }
1863 break;
1864
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1869 return FALSE;
1870 break;
1871
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1876 if (h != NULL
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1878 return FALSE;
1879 break;
1880
1881 default:
1882 break;
1883 }
1884
1885 if (use_plt_got
1886 && h != NULL
1887 && h->plt.refcount > 0
1888 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1889 || h->got.refcount > 0)
1890 && htab->plt_got == NULL)
1891 {
1892 /* Create the GOT procedure linkage table. */
1893 unsigned int plt_got_align;
1894 const struct elf_backend_data *bed;
1895
1896 bed = get_elf_backend_data (info->output_bfd);
1897 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1898 && (sizeof (elf_i386_got_plt_entry)
1899 == sizeof (elf_i386_pic_got_plt_entry)));
1900 plt_got_align = 3;
1901
1902 if (htab->elf.dynobj == NULL)
1903 htab->elf.dynobj = abfd;
1904 htab->plt_got
1905 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1906 ".plt.got",
1907 (bed->dynamic_sec_flags
1908 | SEC_ALLOC
1909 | SEC_CODE
1910 | SEC_LOAD
1911 | SEC_READONLY));
1912 if (htab->plt_got == NULL
1913 || !bfd_set_section_alignment (htab->elf.dynobj,
1914 htab->plt_got,
1915 plt_got_align))
1916 return FALSE;
1917 }
1918
1919 if (r_type == R_386_GOT32
1920 && (h == NULL || h->type != STT_GNU_IFUNC))
1921 sec->need_convert_mov_to_lea = 1;
1922 }
1923
1924 return TRUE;
1925 }
1926
1927 /* Return the section that should be marked against GC for a given
1928 relocation. */
1929
1930 static asection *
1931 elf_i386_gc_mark_hook (asection *sec,
1932 struct bfd_link_info *info,
1933 Elf_Internal_Rela *rel,
1934 struct elf_link_hash_entry *h,
1935 Elf_Internal_Sym *sym)
1936 {
1937 if (h != NULL)
1938 switch (ELF32_R_TYPE (rel->r_info))
1939 {
1940 case R_386_GNU_VTINHERIT:
1941 case R_386_GNU_VTENTRY:
1942 return NULL;
1943 }
1944
1945 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1946 }
1947
1948 /* Update the got entry reference counts for the section being removed. */
1949
1950 static bfd_boolean
1951 elf_i386_gc_sweep_hook (bfd *abfd,
1952 struct bfd_link_info *info,
1953 asection *sec,
1954 const Elf_Internal_Rela *relocs)
1955 {
1956 struct elf_i386_link_hash_table *htab;
1957 Elf_Internal_Shdr *symtab_hdr;
1958 struct elf_link_hash_entry **sym_hashes;
1959 bfd_signed_vma *local_got_refcounts;
1960 const Elf_Internal_Rela *rel, *relend;
1961
1962 if (info->relocatable)
1963 return TRUE;
1964
1965 htab = elf_i386_hash_table (info);
1966 if (htab == NULL)
1967 return FALSE;
1968
1969 elf_section_data (sec)->local_dynrel = NULL;
1970
1971 symtab_hdr = &elf_symtab_hdr (abfd);
1972 sym_hashes = elf_sym_hashes (abfd);
1973 local_got_refcounts = elf_local_got_refcounts (abfd);
1974
1975 relend = relocs + sec->reloc_count;
1976 for (rel = relocs; rel < relend; rel++)
1977 {
1978 unsigned long r_symndx;
1979 unsigned int r_type;
1980 struct elf_link_hash_entry *h = NULL;
1981
1982 r_symndx = ELF32_R_SYM (rel->r_info);
1983 if (r_symndx >= symtab_hdr->sh_info)
1984 {
1985 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1986 while (h->root.type == bfd_link_hash_indirect
1987 || h->root.type == bfd_link_hash_warning)
1988 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1989 }
1990 else
1991 {
1992 /* A local symbol. */
1993 Elf_Internal_Sym *isym;
1994
1995 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1996 abfd, r_symndx);
1997
1998 /* Check relocation against local STT_GNU_IFUNC symbol. */
1999 if (isym != NULL
2000 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2001 {
2002 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2003 if (h == NULL)
2004 abort ();
2005 }
2006 }
2007
2008 if (h)
2009 {
2010 struct elf_i386_link_hash_entry *eh;
2011 struct elf_dyn_relocs **pp;
2012 struct elf_dyn_relocs *p;
2013
2014 eh = (struct elf_i386_link_hash_entry *) h;
2015 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2016 if (p->sec == sec)
2017 {
2018 /* Everything must go for SEC. */
2019 *pp = p->next;
2020 break;
2021 }
2022 }
2023
2024 r_type = ELF32_R_TYPE (rel->r_info);
2025 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2026 symtab_hdr, sym_hashes,
2027 &r_type, GOT_UNKNOWN,
2028 rel, relend, h, r_symndx))
2029 return FALSE;
2030
2031 switch (r_type)
2032 {
2033 case R_386_TLS_LDM:
2034 if (htab->tls_ldm_got.refcount > 0)
2035 htab->tls_ldm_got.refcount -= 1;
2036 break;
2037
2038 case R_386_TLS_GD:
2039 case R_386_TLS_GOTDESC:
2040 case R_386_TLS_DESC_CALL:
2041 case R_386_TLS_IE_32:
2042 case R_386_TLS_IE:
2043 case R_386_TLS_GOTIE:
2044 case R_386_GOT32:
2045 if (h != NULL)
2046 {
2047 if (h->got.refcount > 0)
2048 h->got.refcount -= 1;
2049 if (h->type == STT_GNU_IFUNC)
2050 {
2051 if (h->plt.refcount > 0)
2052 h->plt.refcount -= 1;
2053 }
2054 }
2055 else if (local_got_refcounts != NULL)
2056 {
2057 if (local_got_refcounts[r_symndx] > 0)
2058 local_got_refcounts[r_symndx] -= 1;
2059 }
2060 break;
2061
2062 case R_386_32:
2063 case R_386_PC32:
2064 case R_386_SIZE32:
2065 if (info->shared
2066 && (h == NULL || h->type != STT_GNU_IFUNC))
2067 break;
2068 /* Fall through */
2069
2070 case R_386_PLT32:
2071 if (h != NULL)
2072 {
2073 if (h->plt.refcount > 0)
2074 h->plt.refcount -= 1;
2075 }
2076 break;
2077
2078 case R_386_GOTOFF:
2079 if (h != NULL && h->type == STT_GNU_IFUNC)
2080 {
2081 if (h->got.refcount > 0)
2082 h->got.refcount -= 1;
2083 if (h->plt.refcount > 0)
2084 h->plt.refcount -= 1;
2085 }
2086 break;
2087
2088 default:
2089 break;
2090 }
2091 }
2092
2093 return TRUE;
2094 }
2095
2096 /* Adjust a symbol defined by a dynamic object and referenced by a
2097 regular object. The current definition is in some section of the
2098 dynamic object, but we're not including those sections. We have to
2099 change the definition to something the rest of the link can
2100 understand. */
2101
2102 static bfd_boolean
2103 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2104 struct elf_link_hash_entry *h)
2105 {
2106 struct elf_i386_link_hash_table *htab;
2107 asection *s;
2108 struct elf_i386_link_hash_entry *eh;
2109 struct elf_dyn_relocs *p;
2110
2111 /* STT_GNU_IFUNC symbol must go through PLT. */
2112 if (h->type == STT_GNU_IFUNC)
2113 {
2114 /* All local STT_GNU_IFUNC references must be treate as local
2115 calls via local PLT. */
2116 if (h->ref_regular
2117 && SYMBOL_CALLS_LOCAL (info, h))
2118 {
2119 bfd_size_type pc_count = 0, count = 0;
2120 struct elf_dyn_relocs **pp;
2121
2122 eh = (struct elf_i386_link_hash_entry *) h;
2123 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2124 {
2125 pc_count += p->pc_count;
2126 p->count -= p->pc_count;
2127 p->pc_count = 0;
2128 count += p->count;
2129 if (p->count == 0)
2130 *pp = p->next;
2131 else
2132 pp = &p->next;
2133 }
2134
2135 if (pc_count || count)
2136 {
2137 h->needs_plt = 1;
2138 h->non_got_ref = 1;
2139 if (h->plt.refcount <= 0)
2140 h->plt.refcount = 1;
2141 else
2142 h->plt.refcount += 1;
2143 }
2144 }
2145
2146 if (h->plt.refcount <= 0)
2147 {
2148 h->plt.offset = (bfd_vma) -1;
2149 h->needs_plt = 0;
2150 }
2151 return TRUE;
2152 }
2153
2154 /* If this is a function, put it in the procedure linkage table. We
2155 will fill in the contents of the procedure linkage table later,
2156 when we know the address of the .got section. */
2157 if (h->type == STT_FUNC
2158 || h->needs_plt)
2159 {
2160 if (h->plt.refcount <= 0
2161 || SYMBOL_CALLS_LOCAL (info, h)
2162 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2163 && h->root.type == bfd_link_hash_undefweak))
2164 {
2165 /* This case can occur if we saw a PLT32 reloc in an input
2166 file, but the symbol was never referred to by a dynamic
2167 object, or if all references were garbage collected. In
2168 such a case, we don't actually need to build a procedure
2169 linkage table, and we can just do a PC32 reloc instead. */
2170 h->plt.offset = (bfd_vma) -1;
2171 h->needs_plt = 0;
2172 }
2173
2174 return TRUE;
2175 }
2176 else
2177 /* It's possible that we incorrectly decided a .plt reloc was
2178 needed for an R_386_PC32 reloc to a non-function sym in
2179 check_relocs. We can't decide accurately between function and
2180 non-function syms in check-relocs; Objects loaded later in
2181 the link may change h->type. So fix it now. */
2182 h->plt.offset = (bfd_vma) -1;
2183
2184 /* If this is a weak symbol, and there is a real definition, the
2185 processor independent code will have arranged for us to see the
2186 real definition first, and we can just use the same value. */
2187 if (h->u.weakdef != NULL)
2188 {
2189 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2190 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2191 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2192 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2193 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2194 h->non_got_ref = h->u.weakdef->non_got_ref;
2195 return TRUE;
2196 }
2197
2198 /* This is a reference to a symbol defined by a dynamic object which
2199 is not a function. */
2200
2201 /* If we are creating a shared library, we must presume that the
2202 only references to the symbol are via the global offset table.
2203 For such cases we need not do anything here; the relocations will
2204 be handled correctly by relocate_section. */
2205 if (!info->executable)
2206 return TRUE;
2207
2208 /* If there are no references to this symbol that do not use the
2209 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2210 reloc. */
2211 eh = (struct elf_i386_link_hash_entry *) h;
2212 if (!h->non_got_ref && !eh->gotoff_ref)
2213 return TRUE;
2214
2215 /* If -z nocopyreloc was given, we won't generate them either. */
2216 if (info->nocopyreloc)
2217 {
2218 h->non_got_ref = 0;
2219 return TRUE;
2220 }
2221
2222 htab = elf_i386_hash_table (info);
2223 if (htab == NULL)
2224 return FALSE;
2225
2226 /* If there aren't any dynamic relocs in read-only sections nor
2227 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2228 avoid the copy reloc. This doesn't work on VxWorks, where we can
2229 not have dynamic relocations (other than copy and jump slot
2230 relocations) in an executable. */
2231 if (ELIMINATE_COPY_RELOCS
2232 && !eh->gotoff_ref
2233 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2234 {
2235 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2236 {
2237 s = p->sec->output_section;
2238 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2239 break;
2240 }
2241
2242 if (p == NULL)
2243 {
2244 h->non_got_ref = 0;
2245 return TRUE;
2246 }
2247 }
2248
2249 /* We must allocate the symbol in our .dynbss section, which will
2250 become part of the .bss section of the executable. There will be
2251 an entry for this symbol in the .dynsym section. The dynamic
2252 object will contain position independent code, so all references
2253 from the dynamic object to this symbol will go through the global
2254 offset table. The dynamic linker will use the .dynsym entry to
2255 determine the address it must put in the global offset table, so
2256 both the dynamic object and the regular object will refer to the
2257 same memory location for the variable. */
2258
2259 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2260 copy the initial value out of the dynamic object and into the
2261 runtime process image. */
2262 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2263 {
2264 htab->srelbss->size += sizeof (Elf32_External_Rel);
2265 h->needs_copy = 1;
2266 }
2267
2268 s = htab->sdynbss;
2269
2270 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2271 }
2272
2273 /* Allocate space in .plt, .got and associated reloc sections for
2274 dynamic relocs. */
2275
2276 static bfd_boolean
2277 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2278 {
2279 struct bfd_link_info *info;
2280 struct elf_i386_link_hash_table *htab;
2281 struct elf_i386_link_hash_entry *eh;
2282 struct elf_dyn_relocs *p;
2283 unsigned plt_entry_size;
2284
2285 if (h->root.type == bfd_link_hash_indirect)
2286 return TRUE;
2287
2288 eh = (struct elf_i386_link_hash_entry *) h;
2289
2290 info = (struct bfd_link_info *) inf;
2291 htab = elf_i386_hash_table (info);
2292 if (htab == NULL)
2293 return FALSE;
2294
2295 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2296
2297 /* We can't use the GOT PLT if pointer equality is needed since
2298 finish_dynamic_symbol won't clear symbol value and the dynamic
2299 linker won't update the GOT slot. We will get into an infinite
2300 loop at run-time. */
2301 if (htab->plt_got != NULL
2302 && h->type != STT_GNU_IFUNC
2303 && !h->pointer_equality_needed
2304 && h->plt.refcount > 0
2305 && h->got.refcount > 0)
2306 {
2307 /* Don't use the regular PLT if there are both GOT and GOTPLT
2308 reloctions. */
2309 h->plt.offset = (bfd_vma) -1;
2310
2311 /* Use the GOT PLT. */
2312 eh->plt_got.refcount = 1;
2313 }
2314
2315 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2316 here if it is defined and referenced in a non-shared object. */
2317 if (h->type == STT_GNU_IFUNC
2318 && h->def_regular)
2319 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2320 plt_entry_size,
2321 plt_entry_size, 4);
2322 else if (htab->elf.dynamic_sections_created
2323 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2324 {
2325 bfd_boolean use_plt_got;
2326
2327 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2328 {
2329 /* Don't use the regular PLT for DF_BIND_NOW. */
2330 h->plt.offset = (bfd_vma) -1;
2331
2332 /* Use the GOT PLT. */
2333 h->got.refcount = 1;
2334 eh->plt_got.refcount = 1;
2335 }
2336
2337 use_plt_got = eh->plt_got.refcount > 0;
2338
2339 /* Make sure this symbol is output as a dynamic symbol.
2340 Undefined weak syms won't yet be marked as dynamic. */
2341 if (h->dynindx == -1
2342 && !h->forced_local)
2343 {
2344 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2345 return FALSE;
2346 }
2347
2348 if (info->shared
2349 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2350 {
2351 asection *s = htab->elf.splt;
2352 asection *got_s = htab->plt_got;
2353
2354 if (use_plt_got)
2355 eh->plt_got.offset = got_s->size;
2356 else
2357 {
2358 /* If this is the first .plt entry, make room for the
2359 special first entry. */
2360 if (s->size == 0)
2361 s->size = plt_entry_size;
2362 h->plt.offset = s->size;
2363 }
2364
2365 /* If this symbol is not defined in a regular file, and we are
2366 not generating a shared library, then set the symbol to this
2367 location in the .plt. This is required to make function
2368 pointers compare as equal between the normal executable and
2369 the shared library. */
2370 if (! info->shared
2371 && !h->def_regular)
2372 {
2373 if (use_plt_got)
2374 {
2375 /* We need to make a call to the entry of the GOT PLT
2376 instead of regular PLT entry. */
2377 h->root.u.def.section = got_s;
2378 h->root.u.def.value = eh->plt_got.offset;
2379 }
2380 else
2381 {
2382 h->root.u.def.section = s;
2383 h->root.u.def.value = h->plt.offset;
2384 }
2385 }
2386
2387 /* Make room for this entry. */
2388 if (use_plt_got)
2389 got_s->size += sizeof (elf_i386_got_plt_entry);
2390 else
2391 {
2392 s->size += plt_entry_size;
2393
2394 /* We also need to make an entry in the .got.plt section,
2395 which will be placed in the .got section by the linker
2396 script. */
2397 htab->elf.sgotplt->size += 4;
2398
2399 /* We also need to make an entry in the .rel.plt section. */
2400 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2401 htab->elf.srelplt->reloc_count++;
2402 }
2403
2404 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2405 && !info->shared)
2406 {
2407 /* VxWorks has a second set of relocations for each PLT entry
2408 in executables. They go in a separate relocation section,
2409 which is processed by the kernel loader. */
2410
2411 /* There are two relocations for the initial PLT entry: an
2412 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2413 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2414
2415 if (h->plt.offset == plt_entry_size)
2416 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2417
2418 /* There are two extra relocations for each subsequent PLT entry:
2419 an R_386_32 relocation for the GOT entry, and an R_386_32
2420 relocation for the PLT entry. */
2421
2422 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2423 }
2424 }
2425 else
2426 {
2427 h->plt.offset = (bfd_vma) -1;
2428 h->needs_plt = 0;
2429 }
2430 }
2431 else
2432 {
2433 h->plt.offset = (bfd_vma) -1;
2434 h->needs_plt = 0;
2435 }
2436
2437 eh->tlsdesc_got = (bfd_vma) -1;
2438
2439 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2440 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2441 if (h->got.refcount > 0
2442 && info->executable
2443 && h->dynindx == -1
2444 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2445 h->got.offset = (bfd_vma) -1;
2446 else if (h->got.refcount > 0)
2447 {
2448 asection *s;
2449 bfd_boolean dyn;
2450 int tls_type = elf_i386_hash_entry(h)->tls_type;
2451
2452 /* Make sure this symbol is output as a dynamic symbol.
2453 Undefined weak syms won't yet be marked as dynamic. */
2454 if (h->dynindx == -1
2455 && !h->forced_local)
2456 {
2457 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2458 return FALSE;
2459 }
2460
2461 s = htab->elf.sgot;
2462 if (GOT_TLS_GDESC_P (tls_type))
2463 {
2464 eh->tlsdesc_got = htab->elf.sgotplt->size
2465 - elf_i386_compute_jump_table_size (htab);
2466 htab->elf.sgotplt->size += 8;
2467 h->got.offset = (bfd_vma) -2;
2468 }
2469 if (! GOT_TLS_GDESC_P (tls_type)
2470 || GOT_TLS_GD_P (tls_type))
2471 {
2472 h->got.offset = s->size;
2473 s->size += 4;
2474 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2475 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2476 s->size += 4;
2477 }
2478 dyn = htab->elf.dynamic_sections_created;
2479 /* R_386_TLS_IE_32 needs one dynamic relocation,
2480 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2481 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2482 need two), R_386_TLS_GD needs one if local symbol and two if
2483 global. */
2484 if (tls_type == GOT_TLS_IE_BOTH)
2485 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2486 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2487 || (tls_type & GOT_TLS_IE))
2488 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2489 else if (GOT_TLS_GD_P (tls_type))
2490 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2491 else if (! GOT_TLS_GDESC_P (tls_type)
2492 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2493 || h->root.type != bfd_link_hash_undefweak)
2494 && (info->shared
2495 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2496 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2497 if (GOT_TLS_GDESC_P (tls_type))
2498 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2499 }
2500 else
2501 h->got.offset = (bfd_vma) -1;
2502
2503 if (eh->dyn_relocs == NULL)
2504 return TRUE;
2505
2506 /* In the shared -Bsymbolic case, discard space allocated for
2507 dynamic pc-relative relocs against symbols which turn out to be
2508 defined in regular objects. For the normal shared case, discard
2509 space for pc-relative relocs that have become local due to symbol
2510 visibility changes. */
2511
2512 if (info->shared)
2513 {
2514 /* The only reloc that uses pc_count is R_386_PC32, which will
2515 appear on a call or on something like ".long foo - .". We
2516 want calls to protected symbols to resolve directly to the
2517 function rather than going via the plt. If people want
2518 function pointer comparisons to work as expected then they
2519 should avoid writing assembly like ".long foo - .". */
2520 if (SYMBOL_CALLS_LOCAL (info, h))
2521 {
2522 struct elf_dyn_relocs **pp;
2523
2524 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2525 {
2526 p->count -= p->pc_count;
2527 p->pc_count = 0;
2528 if (p->count == 0)
2529 *pp = p->next;
2530 else
2531 pp = &p->next;
2532 }
2533 }
2534
2535 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2536 {
2537 struct elf_dyn_relocs **pp;
2538 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2539 {
2540 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2541 *pp = p->next;
2542 else
2543 pp = &p->next;
2544 }
2545 }
2546
2547 /* Also discard relocs on undefined weak syms with non-default
2548 visibility. */
2549 if (eh->dyn_relocs != NULL
2550 && h->root.type == bfd_link_hash_undefweak)
2551 {
2552 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2553 eh->dyn_relocs = NULL;
2554
2555 /* Make sure undefined weak symbols are output as a dynamic
2556 symbol in PIEs. */
2557 else if (h->dynindx == -1
2558 && !h->forced_local)
2559 {
2560 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2561 return FALSE;
2562 }
2563 }
2564 }
2565 else if (ELIMINATE_COPY_RELOCS)
2566 {
2567 /* For the non-shared case, discard space for relocs against
2568 symbols which turn out to need copy relocs or are not
2569 dynamic. */
2570
2571 if (!h->non_got_ref
2572 && ((h->def_dynamic
2573 && !h->def_regular)
2574 || (htab->elf.dynamic_sections_created
2575 && (h->root.type == bfd_link_hash_undefweak
2576 || h->root.type == bfd_link_hash_undefined))))
2577 {
2578 /* Make sure this symbol is output as a dynamic symbol.
2579 Undefined weak syms won't yet be marked as dynamic. */
2580 if (h->dynindx == -1
2581 && !h->forced_local)
2582 {
2583 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2584 return FALSE;
2585 }
2586
2587 /* If that succeeded, we know we'll be keeping all the
2588 relocs. */
2589 if (h->dynindx != -1)
2590 goto keep;
2591 }
2592
2593 eh->dyn_relocs = NULL;
2594
2595 keep: ;
2596 }
2597
2598 /* Finally, allocate space. */
2599 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2600 {
2601 asection *sreloc;
2602
2603 sreloc = elf_section_data (p->sec)->sreloc;
2604
2605 BFD_ASSERT (sreloc != NULL);
2606 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2607 }
2608
2609 return TRUE;
2610 }
2611
2612 /* Allocate space in .plt, .got and associated reloc sections for
2613 local dynamic relocs. */
2614
2615 static bfd_boolean
2616 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2617 {
2618 struct elf_link_hash_entry *h
2619 = (struct elf_link_hash_entry *) *slot;
2620
2621 if (h->type != STT_GNU_IFUNC
2622 || !h->def_regular
2623 || !h->ref_regular
2624 || !h->forced_local
2625 || h->root.type != bfd_link_hash_defined)
2626 abort ();
2627
2628 return elf_i386_allocate_dynrelocs (h, inf);
2629 }
2630
2631 /* Find any dynamic relocs that apply to read-only sections. */
2632
2633 static bfd_boolean
2634 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2635 {
2636 struct elf_i386_link_hash_entry *eh;
2637 struct elf_dyn_relocs *p;
2638
2639 /* Skip local IFUNC symbols. */
2640 if (h->forced_local && h->type == STT_GNU_IFUNC)
2641 return TRUE;
2642
2643 eh = (struct elf_i386_link_hash_entry *) h;
2644 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2645 {
2646 asection *s = p->sec->output_section;
2647
2648 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2649 {
2650 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2651
2652 info->flags |= DF_TEXTREL;
2653
2654 if ((info->warn_shared_textrel && info->shared)
2655 || info->error_textrel)
2656 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2657 p->sec->owner, h->root.root.string,
2658 p->sec);
2659
2660 /* Not an error, just cut short the traversal. */
2661 return FALSE;
2662 }
2663 }
2664 return TRUE;
2665 }
2666
2667 /* Convert
2668 mov foo@GOT(%reg), %reg
2669 to
2670 lea foo@GOTOFF(%reg), %reg
2671 with the local symbol, foo. */
2672
2673 static bfd_boolean
2674 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2675 struct bfd_link_info *link_info)
2676 {
2677 Elf_Internal_Shdr *symtab_hdr;
2678 Elf_Internal_Rela *internal_relocs;
2679 Elf_Internal_Rela *irel, *irelend;
2680 bfd_byte *contents;
2681 struct elf_i386_link_hash_table *htab;
2682 bfd_boolean changed_contents;
2683 bfd_boolean changed_relocs;
2684 bfd_signed_vma *local_got_refcounts;
2685
2686 /* Don't even try to convert non-ELF outputs. */
2687 if (!is_elf_hash_table (link_info->hash))
2688 return FALSE;
2689
2690 /* Nothing to do if there is no need or no output. */
2691 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2692 || sec->need_convert_mov_to_lea == 0
2693 || bfd_is_abs_section (sec->output_section))
2694 return TRUE;
2695
2696 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2697
2698 /* Load the relocations for this section. */
2699 internal_relocs = (_bfd_elf_link_read_relocs
2700 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2701 link_info->keep_memory));
2702 if (internal_relocs == NULL)
2703 return FALSE;
2704
2705 htab = elf_i386_hash_table (link_info);
2706 changed_contents = FALSE;
2707 changed_relocs = FALSE;
2708 local_got_refcounts = elf_local_got_refcounts (abfd);
2709
2710 /* Get the section contents. */
2711 if (elf_section_data (sec)->this_hdr.contents != NULL)
2712 contents = elf_section_data (sec)->this_hdr.contents;
2713 else
2714 {
2715 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2716 goto error_return;
2717 }
2718
2719 irelend = internal_relocs + sec->reloc_count;
2720 for (irel = internal_relocs; irel < irelend; irel++)
2721 {
2722 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2723 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2724 unsigned int indx;
2725 struct elf_link_hash_entry *h;
2726
2727 if (r_type != R_386_GOT32)
2728 continue;
2729
2730 /* Get the symbol referred to by the reloc. */
2731 if (r_symndx < symtab_hdr->sh_info)
2732 {
2733 Elf_Internal_Sym *isym;
2734
2735 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2736 abfd, r_symndx);
2737
2738 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2739 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2740 && irel->r_offset >= 2
2741 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2742 {
2743 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2744 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2745 if (local_got_refcounts != NULL
2746 && local_got_refcounts[r_symndx] > 0)
2747 local_got_refcounts[r_symndx] -= 1;
2748 changed_contents = TRUE;
2749 changed_relocs = TRUE;
2750 }
2751 continue;
2752 }
2753
2754 indx = r_symndx - symtab_hdr->sh_info;
2755 h = elf_sym_hashes (abfd)[indx];
2756 BFD_ASSERT (h != NULL);
2757
2758 while (h->root.type == bfd_link_hash_indirect
2759 || h->root.type == bfd_link_hash_warning)
2760 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2761
2762 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2763 optimizing _DYNAMIC since ld.so may use its link-time address. */
2764 if (h->def_regular
2765 && h->type != STT_GNU_IFUNC
2766 && h != htab->elf.hdynamic
2767 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2768 && irel->r_offset >= 2
2769 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2770 {
2771 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2772 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2773 if (h->got.refcount > 0)
2774 h->got.refcount -= 1;
2775 changed_contents = TRUE;
2776 changed_relocs = TRUE;
2777 }
2778 }
2779
2780 if (contents != NULL
2781 && elf_section_data (sec)->this_hdr.contents != contents)
2782 {
2783 if (!changed_contents && !link_info->keep_memory)
2784 free (contents);
2785 else
2786 {
2787 /* Cache the section contents for elf_link_input_bfd. */
2788 elf_section_data (sec)->this_hdr.contents = contents;
2789 }
2790 }
2791
2792 if (elf_section_data (sec)->relocs != internal_relocs)
2793 {
2794 if (!changed_relocs)
2795 free (internal_relocs);
2796 else
2797 elf_section_data (sec)->relocs = internal_relocs;
2798 }
2799
2800 return TRUE;
2801
2802 error_return:
2803 if (contents != NULL
2804 && elf_section_data (sec)->this_hdr.contents != contents)
2805 free (contents);
2806 if (internal_relocs != NULL
2807 && elf_section_data (sec)->relocs != internal_relocs)
2808 free (internal_relocs);
2809 return FALSE;
2810 }
2811
2812 /* Set the sizes of the dynamic sections. */
2813
2814 static bfd_boolean
2815 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2816 {
2817 struct elf_i386_link_hash_table *htab;
2818 bfd *dynobj;
2819 asection *s;
2820 bfd_boolean relocs;
2821 bfd *ibfd;
2822
2823 htab = elf_i386_hash_table (info);
2824 if (htab == NULL)
2825 return FALSE;
2826 dynobj = htab->elf.dynobj;
2827 if (dynobj == NULL)
2828 abort ();
2829
2830 if (htab->elf.dynamic_sections_created)
2831 {
2832 /* Set the contents of the .interp section to the interpreter. */
2833 if (info->executable)
2834 {
2835 s = bfd_get_linker_section (dynobj, ".interp");
2836 if (s == NULL)
2837 abort ();
2838 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2839 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2840 }
2841 }
2842
2843 /* Set up .got offsets for local syms, and space for local dynamic
2844 relocs. */
2845 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2846 {
2847 bfd_signed_vma *local_got;
2848 bfd_signed_vma *end_local_got;
2849 char *local_tls_type;
2850 bfd_vma *local_tlsdesc_gotent;
2851 bfd_size_type locsymcount;
2852 Elf_Internal_Shdr *symtab_hdr;
2853 asection *srel;
2854
2855 if (! is_i386_elf (ibfd))
2856 continue;
2857
2858 for (s = ibfd->sections; s != NULL; s = s->next)
2859 {
2860 struct elf_dyn_relocs *p;
2861
2862 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2863 return FALSE;
2864
2865 for (p = ((struct elf_dyn_relocs *)
2866 elf_section_data (s)->local_dynrel);
2867 p != NULL;
2868 p = p->next)
2869 {
2870 if (!bfd_is_abs_section (p->sec)
2871 && bfd_is_abs_section (p->sec->output_section))
2872 {
2873 /* Input section has been discarded, either because
2874 it is a copy of a linkonce section or due to
2875 linker script /DISCARD/, so we'll be discarding
2876 the relocs too. */
2877 }
2878 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2879 && strcmp (p->sec->output_section->name,
2880 ".tls_vars") == 0)
2881 {
2882 /* Relocations in vxworks .tls_vars sections are
2883 handled specially by the loader. */
2884 }
2885 else if (p->count != 0)
2886 {
2887 srel = elf_section_data (p->sec)->sreloc;
2888 srel->size += p->count * sizeof (Elf32_External_Rel);
2889 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2890 && (info->flags & DF_TEXTREL) == 0)
2891 {
2892 info->flags |= DF_TEXTREL;
2893 if ((info->warn_shared_textrel && info->shared)
2894 || info->error_textrel)
2895 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2896 p->sec->owner, p->sec);
2897 }
2898 }
2899 }
2900 }
2901
2902 local_got = elf_local_got_refcounts (ibfd);
2903 if (!local_got)
2904 continue;
2905
2906 symtab_hdr = &elf_symtab_hdr (ibfd);
2907 locsymcount = symtab_hdr->sh_info;
2908 end_local_got = local_got + locsymcount;
2909 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2910 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2911 s = htab->elf.sgot;
2912 srel = htab->elf.srelgot;
2913 for (; local_got < end_local_got;
2914 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2915 {
2916 *local_tlsdesc_gotent = (bfd_vma) -1;
2917 if (*local_got > 0)
2918 {
2919 if (GOT_TLS_GDESC_P (*local_tls_type))
2920 {
2921 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2922 - elf_i386_compute_jump_table_size (htab);
2923 htab->elf.sgotplt->size += 8;
2924 *local_got = (bfd_vma) -2;
2925 }
2926 if (! GOT_TLS_GDESC_P (*local_tls_type)
2927 || GOT_TLS_GD_P (*local_tls_type))
2928 {
2929 *local_got = s->size;
2930 s->size += 4;
2931 if (GOT_TLS_GD_P (*local_tls_type)
2932 || *local_tls_type == GOT_TLS_IE_BOTH)
2933 s->size += 4;
2934 }
2935 if (info->shared
2936 || GOT_TLS_GD_ANY_P (*local_tls_type)
2937 || (*local_tls_type & GOT_TLS_IE))
2938 {
2939 if (*local_tls_type == GOT_TLS_IE_BOTH)
2940 srel->size += 2 * sizeof (Elf32_External_Rel);
2941 else if (GOT_TLS_GD_P (*local_tls_type)
2942 || ! GOT_TLS_GDESC_P (*local_tls_type))
2943 srel->size += sizeof (Elf32_External_Rel);
2944 if (GOT_TLS_GDESC_P (*local_tls_type))
2945 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2946 }
2947 }
2948 else
2949 *local_got = (bfd_vma) -1;
2950 }
2951 }
2952
2953 if (htab->tls_ldm_got.refcount > 0)
2954 {
2955 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2956 relocs. */
2957 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2958 htab->elf.sgot->size += 8;
2959 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2960 }
2961 else
2962 htab->tls_ldm_got.offset = -1;
2963
2964 /* Allocate global sym .plt and .got entries, and space for global
2965 sym dynamic relocs. */
2966 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2967
2968 /* Allocate .plt and .got entries, and space for local symbols. */
2969 htab_traverse (htab->loc_hash_table,
2970 elf_i386_allocate_local_dynrelocs,
2971 info);
2972
2973 /* For every jump slot reserved in the sgotplt, reloc_count is
2974 incremented. However, when we reserve space for TLS descriptors,
2975 it's not incremented, so in order to compute the space reserved
2976 for them, it suffices to multiply the reloc count by the jump
2977 slot size.
2978
2979 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2980 so that R_386_IRELATIVE entries come last. */
2981 if (htab->elf.srelplt)
2982 {
2983 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2984 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2985 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2986 }
2987 else if (htab->elf.irelplt)
2988 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2989
2990
2991 if (htab->elf.sgotplt)
2992 {
2993 /* Don't allocate .got.plt section if there are no GOT nor PLT
2994 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2995 if ((htab->elf.hgot == NULL
2996 || !htab->elf.hgot->ref_regular_nonweak)
2997 && (htab->elf.sgotplt->size
2998 == get_elf_backend_data (output_bfd)->got_header_size)
2999 && (htab->elf.splt == NULL
3000 || htab->elf.splt->size == 0)
3001 && (htab->elf.sgot == NULL
3002 || htab->elf.sgot->size == 0)
3003 && (htab->elf.iplt == NULL
3004 || htab->elf.iplt->size == 0)
3005 && (htab->elf.igotplt == NULL
3006 || htab->elf.igotplt->size == 0))
3007 htab->elf.sgotplt->size = 0;
3008 }
3009
3010
3011 if (htab->plt_eh_frame != NULL
3012 && htab->elf.splt != NULL
3013 && htab->elf.splt->size != 0
3014 && !bfd_is_abs_section (htab->elf.splt->output_section)
3015 && _bfd_elf_eh_frame_present (info))
3016 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3017
3018 /* We now have determined the sizes of the various dynamic sections.
3019 Allocate memory for them. */
3020 relocs = FALSE;
3021 for (s = dynobj->sections; s != NULL; s = s->next)
3022 {
3023 bfd_boolean strip_section = TRUE;
3024
3025 if ((s->flags & SEC_LINKER_CREATED) == 0)
3026 continue;
3027
3028 if (s == htab->elf.splt
3029 || s == htab->elf.sgot)
3030 {
3031 /* Strip this section if we don't need it; see the
3032 comment below. */
3033 /* We'd like to strip these sections if they aren't needed, but if
3034 we've exported dynamic symbols from them we must leave them.
3035 It's too late to tell BFD to get rid of the symbols. */
3036
3037 if (htab->elf.hplt != NULL)
3038 strip_section = FALSE;
3039 }
3040 else if (s == htab->elf.sgotplt
3041 || s == htab->elf.iplt
3042 || s == htab->elf.igotplt
3043 || s == htab->plt_got
3044 || s == htab->plt_eh_frame
3045 || s == htab->sdynbss)
3046 {
3047 /* Strip these too. */
3048 }
3049 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3050 {
3051 if (s->size != 0
3052 && s != htab->elf.srelplt
3053 && s != htab->srelplt2)
3054 relocs = TRUE;
3055
3056 /* We use the reloc_count field as a counter if we need
3057 to copy relocs into the output file. */
3058 s->reloc_count = 0;
3059 }
3060 else
3061 {
3062 /* It's not one of our sections, so don't allocate space. */
3063 continue;
3064 }
3065
3066 if (s->size == 0)
3067 {
3068 /* If we don't need this section, strip it from the
3069 output file. This is mostly to handle .rel.bss and
3070 .rel.plt. We must create both sections in
3071 create_dynamic_sections, because they must be created
3072 before the linker maps input sections to output
3073 sections. The linker does that before
3074 adjust_dynamic_symbol is called, and it is that
3075 function which decides whether anything needs to go
3076 into these sections. */
3077 if (strip_section)
3078 s->flags |= SEC_EXCLUDE;
3079 continue;
3080 }
3081
3082 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3083 continue;
3084
3085 /* Allocate memory for the section contents. We use bfd_zalloc
3086 here in case unused entries are not reclaimed before the
3087 section's contents are written out. This should not happen,
3088 but this way if it does, we get a R_386_NONE reloc instead
3089 of garbage. */
3090 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3091 if (s->contents == NULL)
3092 return FALSE;
3093 }
3094
3095 if (htab->plt_eh_frame != NULL
3096 && htab->plt_eh_frame->contents != NULL)
3097 {
3098 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3099 sizeof (elf_i386_eh_frame_plt));
3100 bfd_put_32 (dynobj, htab->elf.splt->size,
3101 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3102 }
3103
3104 if (htab->elf.dynamic_sections_created)
3105 {
3106 /* Add some entries to the .dynamic section. We fill in the
3107 values later, in elf_i386_finish_dynamic_sections, but we
3108 must add the entries now so that we get the correct size for
3109 the .dynamic section. The DT_DEBUG entry is filled in by the
3110 dynamic linker and used by the debugger. */
3111 #define add_dynamic_entry(TAG, VAL) \
3112 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3113
3114 if (info->executable)
3115 {
3116 if (!add_dynamic_entry (DT_DEBUG, 0))
3117 return FALSE;
3118 }
3119
3120 if (htab->elf.splt->size != 0)
3121 {
3122 if (!add_dynamic_entry (DT_PLTGOT, 0)
3123 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3124 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3125 || !add_dynamic_entry (DT_JMPREL, 0))
3126 return FALSE;
3127 }
3128
3129 if (relocs)
3130 {
3131 if (!add_dynamic_entry (DT_REL, 0)
3132 || !add_dynamic_entry (DT_RELSZ, 0)
3133 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3134 return FALSE;
3135
3136 /* If any dynamic relocs apply to a read-only section,
3137 then we need a DT_TEXTREL entry. */
3138 if ((info->flags & DF_TEXTREL) == 0)
3139 elf_link_hash_traverse (&htab->elf,
3140 elf_i386_readonly_dynrelocs, info);
3141
3142 if ((info->flags & DF_TEXTREL) != 0)
3143 {
3144 if (!add_dynamic_entry (DT_TEXTREL, 0))
3145 return FALSE;
3146 }
3147 }
3148 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3149 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3150 return FALSE;
3151 }
3152 #undef add_dynamic_entry
3153
3154 return TRUE;
3155 }
3156
3157 static bfd_boolean
3158 elf_i386_always_size_sections (bfd *output_bfd,
3159 struct bfd_link_info *info)
3160 {
3161 asection *tls_sec = elf_hash_table (info)->tls_sec;
3162
3163 if (tls_sec)
3164 {
3165 struct elf_link_hash_entry *tlsbase;
3166
3167 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3168 "_TLS_MODULE_BASE_",
3169 FALSE, FALSE, FALSE);
3170
3171 if (tlsbase && tlsbase->type == STT_TLS)
3172 {
3173 struct elf_i386_link_hash_table *htab;
3174 struct bfd_link_hash_entry *bh = NULL;
3175 const struct elf_backend_data *bed
3176 = get_elf_backend_data (output_bfd);
3177
3178 htab = elf_i386_hash_table (info);
3179 if (htab == NULL)
3180 return FALSE;
3181
3182 if (!(_bfd_generic_link_add_one_symbol
3183 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3184 tls_sec, 0, NULL, FALSE,
3185 bed->collect, &bh)))
3186 return FALSE;
3187
3188 htab->tls_module_base = bh;
3189
3190 tlsbase = (struct elf_link_hash_entry *)bh;
3191 tlsbase->def_regular = 1;
3192 tlsbase->other = STV_HIDDEN;
3193 tlsbase->root.linker_def = 1;
3194 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3195 }
3196 }
3197
3198 return TRUE;
3199 }
3200
3201 /* Set the correct type for an x86 ELF section. We do this by the
3202 section name, which is a hack, but ought to work. */
3203
3204 static bfd_boolean
3205 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3206 Elf_Internal_Shdr *hdr,
3207 asection *sec)
3208 {
3209 const char *name;
3210
3211 name = bfd_get_section_name (abfd, sec);
3212
3213 /* This is an ugly, but unfortunately necessary hack that is
3214 needed when producing EFI binaries on x86. It tells
3215 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3216 containing ELF relocation info. We need this hack in order to
3217 be able to generate ELF binaries that can be translated into
3218 EFI applications (which are essentially COFF objects). Those
3219 files contain a COFF ".reloc" section inside an ELFNN object,
3220 which would normally cause BFD to segfault because it would
3221 attempt to interpret this section as containing relocation
3222 entries for section "oc". With this hack enabled, ".reloc"
3223 will be treated as a normal data section, which will avoid the
3224 segfault. However, you won't be able to create an ELFNN binary
3225 with a section named "oc" that needs relocations, but that's
3226 the kind of ugly side-effects you get when detecting section
3227 types based on their names... In practice, this limitation is
3228 unlikely to bite. */
3229 if (strcmp (name, ".reloc") == 0)
3230 hdr->sh_type = SHT_PROGBITS;
3231
3232 return TRUE;
3233 }
3234
3235 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3236 executables. Rather than setting it to the beginning of the TLS
3237 section, we have to set it to the end. This function may be called
3238 multiple times, it is idempotent. */
3239
3240 static void
3241 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3242 {
3243 struct elf_i386_link_hash_table *htab;
3244 struct bfd_link_hash_entry *base;
3245
3246 if (!info->executable)
3247 return;
3248
3249 htab = elf_i386_hash_table (info);
3250 if (htab == NULL)
3251 return;
3252
3253 base = htab->tls_module_base;
3254 if (base == NULL)
3255 return;
3256
3257 base->u.def.value = htab->elf.tls_size;
3258 }
3259
3260 /* Return the base VMA address which should be subtracted from real addresses
3261 when resolving @dtpoff relocation.
3262 This is PT_TLS segment p_vaddr. */
3263
3264 static bfd_vma
3265 elf_i386_dtpoff_base (struct bfd_link_info *info)
3266 {
3267 /* If tls_sec is NULL, we should have signalled an error already. */
3268 if (elf_hash_table (info)->tls_sec == NULL)
3269 return 0;
3270 return elf_hash_table (info)->tls_sec->vma;
3271 }
3272
3273 /* Return the relocation value for @tpoff relocation
3274 if STT_TLS virtual address is ADDRESS. */
3275
3276 static bfd_vma
3277 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3278 {
3279 struct elf_link_hash_table *htab = elf_hash_table (info);
3280 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3281 bfd_vma static_tls_size;
3282
3283 /* If tls_sec is NULL, we should have signalled an error already. */
3284 if (htab->tls_sec == NULL)
3285 return 0;
3286
3287 /* Consider special static TLS alignment requirements. */
3288 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3289 return static_tls_size + htab->tls_sec->vma - address;
3290 }
3291
3292 /* Relocate an i386 ELF section. */
3293
3294 static bfd_boolean
3295 elf_i386_relocate_section (bfd *output_bfd,
3296 struct bfd_link_info *info,
3297 bfd *input_bfd,
3298 asection *input_section,
3299 bfd_byte *contents,
3300 Elf_Internal_Rela *relocs,
3301 Elf_Internal_Sym *local_syms,
3302 asection **local_sections)
3303 {
3304 struct elf_i386_link_hash_table *htab;
3305 Elf_Internal_Shdr *symtab_hdr;
3306 struct elf_link_hash_entry **sym_hashes;
3307 bfd_vma *local_got_offsets;
3308 bfd_vma *local_tlsdesc_gotents;
3309 Elf_Internal_Rela *rel;
3310 Elf_Internal_Rela *relend;
3311 bfd_boolean is_vxworks_tls;
3312 unsigned plt_entry_size;
3313
3314 BFD_ASSERT (is_i386_elf (input_bfd));
3315
3316 htab = elf_i386_hash_table (info);
3317 if (htab == NULL)
3318 return FALSE;
3319 symtab_hdr = &elf_symtab_hdr (input_bfd);
3320 sym_hashes = elf_sym_hashes (input_bfd);
3321 local_got_offsets = elf_local_got_offsets (input_bfd);
3322 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3323 /* We have to handle relocations in vxworks .tls_vars sections
3324 specially, because the dynamic loader is 'weird'. */
3325 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3326 && info->shared
3327 && !strcmp (input_section->output_section->name,
3328 ".tls_vars"));
3329
3330 elf_i386_set_tls_module_base (info);
3331
3332 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3333
3334 rel = relocs;
3335 relend = relocs + input_section->reloc_count;
3336 for (; rel < relend; rel++)
3337 {
3338 unsigned int r_type;
3339 reloc_howto_type *howto;
3340 unsigned long r_symndx;
3341 struct elf_link_hash_entry *h;
3342 struct elf_i386_link_hash_entry *eh;
3343 Elf_Internal_Sym *sym;
3344 asection *sec;
3345 bfd_vma off, offplt, plt_offset;
3346 bfd_vma relocation;
3347 bfd_boolean unresolved_reloc;
3348 bfd_reloc_status_type r;
3349 unsigned int indx;
3350 int tls_type;
3351 bfd_vma st_size;
3352 asection *resolved_plt;
3353
3354 r_type = ELF32_R_TYPE (rel->r_info);
3355 if (r_type == R_386_GNU_VTINHERIT
3356 || r_type == R_386_GNU_VTENTRY)
3357 continue;
3358
3359 if ((indx = r_type) >= R_386_standard
3360 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3361 >= R_386_ext - R_386_standard)
3362 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3363 >= R_386_irelative - R_386_ext))
3364 {
3365 (*_bfd_error_handler)
3366 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3367 input_bfd, input_section, r_type);
3368 bfd_set_error (bfd_error_bad_value);
3369 return FALSE;
3370 }
3371 howto = elf_howto_table + indx;
3372
3373 r_symndx = ELF32_R_SYM (rel->r_info);
3374 h = NULL;
3375 sym = NULL;
3376 sec = NULL;
3377 unresolved_reloc = FALSE;
3378 if (r_symndx < symtab_hdr->sh_info)
3379 {
3380 sym = local_syms + r_symndx;
3381 sec = local_sections[r_symndx];
3382 relocation = (sec->output_section->vma
3383 + sec->output_offset
3384 + sym->st_value);
3385 st_size = sym->st_size;
3386
3387 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3388 && ((sec->flags & SEC_MERGE) != 0
3389 || (info->relocatable
3390 && sec->output_offset != 0)))
3391 {
3392 bfd_vma addend;
3393 bfd_byte *where = contents + rel->r_offset;
3394
3395 switch (howto->size)
3396 {
3397 case 0:
3398 addend = bfd_get_8 (input_bfd, where);
3399 if (howto->pc_relative)
3400 {
3401 addend = (addend ^ 0x80) - 0x80;
3402 addend += 1;
3403 }
3404 break;
3405 case 1:
3406 addend = bfd_get_16 (input_bfd, where);
3407 if (howto->pc_relative)
3408 {
3409 addend = (addend ^ 0x8000) - 0x8000;
3410 addend += 2;
3411 }
3412 break;
3413 case 2:
3414 addend = bfd_get_32 (input_bfd, where);
3415 if (howto->pc_relative)
3416 {
3417 addend = (addend ^ 0x80000000) - 0x80000000;
3418 addend += 4;
3419 }
3420 break;
3421 default:
3422 abort ();
3423 }
3424
3425 if (info->relocatable)
3426 addend += sec->output_offset;
3427 else
3428 {
3429 asection *msec = sec;
3430 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3431 addend);
3432 addend -= relocation;
3433 addend += msec->output_section->vma + msec->output_offset;
3434 }
3435
3436 switch (howto->size)
3437 {
3438 case 0:
3439 /* FIXME: overflow checks. */
3440 if (howto->pc_relative)
3441 addend -= 1;
3442 bfd_put_8 (input_bfd, addend, where);
3443 break;
3444 case 1:
3445 if (howto->pc_relative)
3446 addend -= 2;
3447 bfd_put_16 (input_bfd, addend, where);
3448 break;
3449 case 2:
3450 if (howto->pc_relative)
3451 addend -= 4;
3452 bfd_put_32 (input_bfd, addend, where);
3453 break;
3454 }
3455 }
3456 else if (!info->relocatable
3457 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3458 {
3459 /* Relocate against local STT_GNU_IFUNC symbol. */
3460 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3461 FALSE);
3462 if (h == NULL)
3463 abort ();
3464
3465 /* Set STT_GNU_IFUNC symbol value. */
3466 h->root.u.def.value = sym->st_value;
3467 h->root.u.def.section = sec;
3468 }
3469 }
3470 else
3471 {
3472 bfd_boolean warned ATTRIBUTE_UNUSED;
3473 bfd_boolean ignored ATTRIBUTE_UNUSED;
3474
3475 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3476 r_symndx, symtab_hdr, sym_hashes,
3477 h, sec, relocation,
3478 unresolved_reloc, warned, ignored);
3479 st_size = h->size;
3480 }
3481
3482 if (sec != NULL && discarded_section (sec))
3483 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3484 rel, 1, relend, howto, 0, contents);
3485
3486 if (info->relocatable)
3487 continue;
3488
3489 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3490 it here if it is defined in a non-shared object. */
3491 if (h != NULL
3492 && h->type == STT_GNU_IFUNC
3493 && h->def_regular)
3494 {
3495 asection *plt, *gotplt, *base_got;
3496 bfd_vma plt_index;
3497 const char *name;
3498
3499 if ((input_section->flags & SEC_ALLOC) == 0
3500 || h->plt.offset == (bfd_vma) -1)
3501 abort ();
3502
3503 /* STT_GNU_IFUNC symbol must go through PLT. */
3504 if (htab->elf.splt != NULL)
3505 {
3506 plt = htab->elf.splt;
3507 gotplt = htab->elf.sgotplt;
3508 }
3509 else
3510 {
3511 plt = htab->elf.iplt;
3512 gotplt = htab->elf.igotplt;
3513 }
3514
3515 relocation = (plt->output_section->vma
3516 + plt->output_offset + h->plt.offset);
3517
3518 switch (r_type)
3519 {
3520 default:
3521 if (h->root.root.string)
3522 name = h->root.root.string;
3523 else
3524 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3525 NULL);
3526 (*_bfd_error_handler)
3527 (_("%B: relocation %s against STT_GNU_IFUNC "
3528 "symbol `%s' isn't handled by %s"), input_bfd,
3529 elf_howto_table[r_type].name,
3530 name, __FUNCTION__);
3531 bfd_set_error (bfd_error_bad_value);
3532 return FALSE;
3533
3534 case R_386_32:
3535 /* Generate dynamic relcoation only when there is a
3536 non-GOT reference in a shared object. */
3537 if (info->shared && h->non_got_ref)
3538 {
3539 Elf_Internal_Rela outrel;
3540 asection *sreloc;
3541 bfd_vma offset;
3542
3543 /* Need a dynamic relocation to get the real function
3544 adddress. */
3545 offset = _bfd_elf_section_offset (output_bfd,
3546 info,
3547 input_section,
3548 rel->r_offset);
3549 if (offset == (bfd_vma) -1
3550 || offset == (bfd_vma) -2)
3551 abort ();
3552
3553 outrel.r_offset = (input_section->output_section->vma
3554 + input_section->output_offset
3555 + offset);
3556
3557 if (h->dynindx == -1
3558 || h->forced_local
3559 || info->executable)
3560 {
3561 /* This symbol is resolved locally. */
3562 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3563 bfd_put_32 (output_bfd,
3564 (h->root.u.def.value
3565 + h->root.u.def.section->output_section->vma
3566 + h->root.u.def.section->output_offset),
3567 contents + offset);
3568 }
3569 else
3570 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3571
3572 sreloc = htab->elf.irelifunc;
3573 elf_append_rel (output_bfd, sreloc, &outrel);
3574
3575 /* If this reloc is against an external symbol, we
3576 do not want to fiddle with the addend. Otherwise,
3577 we need to include the symbol value so that it
3578 becomes an addend for the dynamic reloc. For an
3579 internal symbol, we have updated addend. */
3580 continue;
3581 }
3582 /* FALLTHROUGH */
3583 case R_386_PC32:
3584 case R_386_PLT32:
3585 goto do_relocation;
3586
3587 case R_386_GOT32:
3588 base_got = htab->elf.sgot;
3589 off = h->got.offset;
3590
3591 if (base_got == NULL)
3592 abort ();
3593
3594 if (off == (bfd_vma) -1)
3595 {
3596 /* We can't use h->got.offset here to save state, or
3597 even just remember the offset, as finish_dynamic_symbol
3598 would use that as offset into .got. */
3599
3600 if (htab->elf.splt != NULL)
3601 {
3602 plt_index = h->plt.offset / plt_entry_size - 1;
3603 off = (plt_index + 3) * 4;
3604 base_got = htab->elf.sgotplt;
3605 }
3606 else
3607 {
3608 plt_index = h->plt.offset / plt_entry_size;
3609 off = plt_index * 4;
3610 base_got = htab->elf.igotplt;
3611 }
3612
3613 if (h->dynindx == -1
3614 || h->forced_local
3615 || info->symbolic)
3616 {
3617 /* This references the local defitionion. We must
3618 initialize this entry in the global offset table.
3619 Since the offset must always be a multiple of 8,
3620 we use the least significant bit to record
3621 whether we have initialized it already.
3622
3623 When doing a dynamic link, we create a .rela.got
3624 relocation entry to initialize the value. This
3625 is done in the finish_dynamic_symbol routine. */
3626 if ((off & 1) != 0)
3627 off &= ~1;
3628 else
3629 {
3630 bfd_put_32 (output_bfd, relocation,
3631 base_got->contents + off);
3632 h->got.offset |= 1;
3633 }
3634 }
3635
3636 relocation = off;
3637
3638 /* Adjust for static executables. */
3639 if (htab->elf.splt == NULL)
3640 relocation += gotplt->output_offset;
3641 }
3642 else
3643 {
3644 relocation = (base_got->output_section->vma
3645 + base_got->output_offset + off
3646 - gotplt->output_section->vma
3647 - gotplt->output_offset);
3648 /* Adjust for static executables. */
3649 if (htab->elf.splt == NULL)
3650 relocation += gotplt->output_offset;
3651 }
3652
3653 goto do_relocation;
3654
3655 case R_386_GOTOFF:
3656 relocation -= (gotplt->output_section->vma
3657 + gotplt->output_offset);
3658 goto do_relocation;
3659 }
3660 }
3661
3662 switch (r_type)
3663 {
3664 case R_386_GOT32:
3665 /* Relocation is to the entry for this symbol in the global
3666 offset table. */
3667 if (htab->elf.sgot == NULL)
3668 abort ();
3669
3670 if (h != NULL)
3671 {
3672 bfd_boolean dyn;
3673
3674 off = h->got.offset;
3675 dyn = htab->elf.dynamic_sections_created;
3676 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3677 || (info->shared
3678 && SYMBOL_REFERENCES_LOCAL (info, h))
3679 || (ELF_ST_VISIBILITY (h->other)
3680 && h->root.type == bfd_link_hash_undefweak))
3681 {
3682 /* This is actually a static link, or it is a
3683 -Bsymbolic link and the symbol is defined
3684 locally, or the symbol was forced to be local
3685 because of a version file. We must initialize
3686 this entry in the global offset table. Since the
3687 offset must always be a multiple of 4, we use the
3688 least significant bit to record whether we have
3689 initialized it already.
3690
3691 When doing a dynamic link, we create a .rel.got
3692 relocation entry to initialize the value. This
3693 is done in the finish_dynamic_symbol routine. */
3694 if ((off & 1) != 0)
3695 off &= ~1;
3696 else
3697 {
3698 bfd_put_32 (output_bfd, relocation,
3699 htab->elf.sgot->contents + off);
3700 h->got.offset |= 1;
3701 }
3702 }
3703 else
3704 unresolved_reloc = FALSE;
3705 }
3706 else
3707 {
3708 if (local_got_offsets == NULL)
3709 abort ();
3710
3711 off = local_got_offsets[r_symndx];
3712
3713 /* The offset must always be a multiple of 4. We use
3714 the least significant bit to record whether we have
3715 already generated the necessary reloc. */
3716 if ((off & 1) != 0)
3717 off &= ~1;
3718 else
3719 {
3720 bfd_put_32 (output_bfd, relocation,
3721 htab->elf.sgot->contents + off);
3722
3723 if (info->shared)
3724 {
3725 asection *s;
3726 Elf_Internal_Rela outrel;
3727
3728 s = htab->elf.srelgot;
3729 if (s == NULL)
3730 abort ();
3731
3732 outrel.r_offset = (htab->elf.sgot->output_section->vma
3733 + htab->elf.sgot->output_offset
3734 + off);
3735 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3736 elf_append_rel (output_bfd, s, &outrel);
3737 }
3738
3739 local_got_offsets[r_symndx] |= 1;
3740 }
3741 }
3742
3743 if (off >= (bfd_vma) -2)
3744 abort ();
3745
3746 relocation = htab->elf.sgot->output_section->vma
3747 + htab->elf.sgot->output_offset + off
3748 - htab->elf.sgotplt->output_section->vma
3749 - htab->elf.sgotplt->output_offset;
3750 break;
3751
3752 case R_386_GOTOFF:
3753 /* Relocation is relative to the start of the global offset
3754 table. */
3755
3756 /* Check to make sure it isn't a protected function or data
3757 symbol for shared library since it may not be local when
3758 used as function address or with copy relocation. We also
3759 need to make sure that a symbol is referenced locally. */
3760 if (!info->executable && h)
3761 {
3762 if (!h->def_regular)
3763 {
3764 const char *v;
3765
3766 switch (ELF_ST_VISIBILITY (h->other))
3767 {
3768 case STV_HIDDEN:
3769 v = _("hidden symbol");
3770 break;
3771 case STV_INTERNAL:
3772 v = _("internal symbol");
3773 break;
3774 case STV_PROTECTED:
3775 v = _("protected symbol");
3776 break;
3777 default:
3778 v = _("symbol");
3779 break;
3780 }
3781
3782 (*_bfd_error_handler)
3783 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3784 input_bfd, v, h->root.root.string);
3785 bfd_set_error (bfd_error_bad_value);
3786 return FALSE;
3787 }
3788 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3789 && (h->type == STT_FUNC
3790 || h->type == STT_OBJECT)
3791 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3792 {
3793 (*_bfd_error_handler)
3794 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3795 input_bfd,
3796 h->type == STT_FUNC ? "function" : "data",
3797 h->root.root.string);
3798 bfd_set_error (bfd_error_bad_value);
3799 return FALSE;
3800 }
3801 }
3802
3803 /* Note that sgot is not involved in this
3804 calculation. We always want the start of .got.plt. If we
3805 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3806 permitted by the ABI, we might have to change this
3807 calculation. */
3808 relocation -= htab->elf.sgotplt->output_section->vma
3809 + htab->elf.sgotplt->output_offset;
3810 break;
3811
3812 case R_386_GOTPC:
3813 /* Use global offset table as symbol value. */
3814 relocation = htab->elf.sgotplt->output_section->vma
3815 + htab->elf.sgotplt->output_offset;
3816 unresolved_reloc = FALSE;
3817 break;
3818
3819 case R_386_PLT32:
3820 /* Relocation is to the entry for this symbol in the
3821 procedure linkage table. */
3822
3823 /* Resolve a PLT32 reloc against a local symbol directly,
3824 without using the procedure linkage table. */
3825 if (h == NULL)
3826 break;
3827
3828 eh = (struct elf_i386_link_hash_entry *) h;
3829 if ((h->plt.offset == (bfd_vma) -1
3830 && eh->plt_got.offset == (bfd_vma) -1)
3831 || htab->elf.splt == NULL)
3832 {
3833 /* We didn't make a PLT entry for this symbol. This
3834 happens when statically linking PIC code, or when
3835 using -Bsymbolic. */
3836 break;
3837 }
3838
3839 if (h->plt.offset != (bfd_vma) -1)
3840 {
3841 resolved_plt = htab->elf.splt;
3842 plt_offset = h->plt.offset;
3843 }
3844 else
3845 {
3846 resolved_plt = htab->plt_got;
3847 plt_offset = eh->plt_got.offset;
3848 }
3849
3850 relocation = (resolved_plt->output_section->vma
3851 + resolved_plt->output_offset
3852 + plt_offset);
3853 unresolved_reloc = FALSE;
3854 break;
3855
3856 case R_386_SIZE32:
3857 /* Set to symbol size. */
3858 relocation = st_size;
3859 /* Fall through. */
3860
3861 case R_386_32:
3862 case R_386_PC32:
3863 if ((input_section->flags & SEC_ALLOC) == 0
3864 || is_vxworks_tls)
3865 break;
3866
3867 if ((info->shared
3868 && (h == NULL
3869 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3870 || h->root.type != bfd_link_hash_undefweak)
3871 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3872 || !SYMBOL_CALLS_LOCAL (info, h)))
3873 || (ELIMINATE_COPY_RELOCS
3874 && !info->shared
3875 && h != NULL
3876 && h->dynindx != -1
3877 && !h->non_got_ref
3878 && ((h->def_dynamic
3879 && !h->def_regular)
3880 || h->root.type == bfd_link_hash_undefweak
3881 || h->root.type == bfd_link_hash_undefined)))
3882 {
3883 Elf_Internal_Rela outrel;
3884 bfd_boolean skip, relocate;
3885 asection *sreloc;
3886
3887 /* When generating a shared object, these relocations
3888 are copied into the output file to be resolved at run
3889 time. */
3890
3891 skip = FALSE;
3892 relocate = FALSE;
3893
3894 outrel.r_offset =
3895 _bfd_elf_section_offset (output_bfd, info, input_section,
3896 rel->r_offset);
3897 if (outrel.r_offset == (bfd_vma) -1)
3898 skip = TRUE;
3899 else if (outrel.r_offset == (bfd_vma) -2)
3900 skip = TRUE, relocate = TRUE;
3901 outrel.r_offset += (input_section->output_section->vma
3902 + input_section->output_offset);
3903
3904 if (skip)
3905 memset (&outrel, 0, sizeof outrel);
3906 else if (h != NULL
3907 && h->dynindx != -1
3908 && (r_type == R_386_PC32
3909 || !info->shared
3910 || !SYMBOLIC_BIND (info, h)
3911 || !h->def_regular))
3912 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3913 else
3914 {
3915 /* This symbol is local, or marked to become local. */
3916 relocate = TRUE;
3917 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3918 }
3919
3920 sreloc = elf_section_data (input_section)->sreloc;
3921
3922 if (sreloc == NULL || sreloc->contents == NULL)
3923 {
3924 r = bfd_reloc_notsupported;
3925 goto check_relocation_error;
3926 }
3927
3928 elf_append_rel (output_bfd, sreloc, &outrel);
3929
3930 /* If this reloc is against an external symbol, we do
3931 not want to fiddle with the addend. Otherwise, we
3932 need to include the symbol value so that it becomes
3933 an addend for the dynamic reloc. */
3934 if (! relocate)
3935 continue;
3936 }
3937 break;
3938
3939 case R_386_TLS_IE:
3940 if (!info->executable)
3941 {
3942 Elf_Internal_Rela outrel;
3943 asection *sreloc;
3944
3945 outrel.r_offset = rel->r_offset
3946 + input_section->output_section->vma
3947 + input_section->output_offset;
3948 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3949 sreloc = elf_section_data (input_section)->sreloc;
3950 if (sreloc == NULL)
3951 abort ();
3952 elf_append_rel (output_bfd, sreloc, &outrel);
3953 }
3954 /* Fall through */
3955
3956 case R_386_TLS_GD:
3957 case R_386_TLS_GOTDESC:
3958 case R_386_TLS_DESC_CALL:
3959 case R_386_TLS_IE_32:
3960 case R_386_TLS_GOTIE:
3961 tls_type = GOT_UNKNOWN;
3962 if (h == NULL && local_got_offsets)
3963 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3964 else if (h != NULL)
3965 tls_type = elf_i386_hash_entry(h)->tls_type;
3966 if (tls_type == GOT_TLS_IE)
3967 tls_type = GOT_TLS_IE_NEG;
3968
3969 if (! elf_i386_tls_transition (info, input_bfd,
3970 input_section, contents,
3971 symtab_hdr, sym_hashes,
3972 &r_type, tls_type, rel,
3973 relend, h, r_symndx))
3974 return FALSE;
3975
3976 if (r_type == R_386_TLS_LE_32)
3977 {
3978 BFD_ASSERT (! unresolved_reloc);
3979 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3980 {
3981 unsigned int type;
3982 bfd_vma roff;
3983
3984 /* GD->LE transition. */
3985 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3986 if (type == 0x04)
3987 {
3988 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3989 Change it into:
3990 movl %gs:0, %eax; subl $foo@tpoff, %eax
3991 (6 byte form of subl). */
3992 memcpy (contents + rel->r_offset - 3,
3993 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3994 roff = rel->r_offset + 5;
3995 }
3996 else
3997 {
3998 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3999 Change it into:
4000 movl %gs:0, %eax; subl $foo@tpoff, %eax
4001 (6 byte form of subl). */
4002 memcpy (contents + rel->r_offset - 2,
4003 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4004 roff = rel->r_offset + 6;
4005 }
4006 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4007 contents + roff);
4008 /* Skip R_386_PC32/R_386_PLT32. */
4009 rel++;
4010 continue;
4011 }
4012 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4013 {
4014 /* GDesc -> LE transition.
4015 It's originally something like:
4016 leal x@tlsdesc(%ebx), %eax
4017
4018 leal x@ntpoff, %eax
4019
4020 Registers other than %eax may be set up here. */
4021
4022 unsigned int val;
4023 bfd_vma roff;
4024
4025 roff = rel->r_offset;
4026 val = bfd_get_8 (input_bfd, contents + roff - 1);
4027
4028 /* Now modify the instruction as appropriate. */
4029 /* aoliva FIXME: remove the above and xor the byte
4030 below with 0x86. */
4031 bfd_put_8 (output_bfd, val ^ 0x86,
4032 contents + roff - 1);
4033 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4034 contents + roff);
4035 continue;
4036 }
4037 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4038 {
4039 /* GDesc -> LE transition.
4040 It's originally:
4041 call *(%eax)
4042 Turn it into:
4043 xchg %ax,%ax */
4044
4045 bfd_vma roff;
4046
4047 roff = rel->r_offset;
4048 bfd_put_8 (output_bfd, 0x66, contents + roff);
4049 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4050 continue;
4051 }
4052 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4053 {
4054 unsigned int val;
4055
4056 /* IE->LE transition:
4057 Originally it can be one of:
4058 movl foo, %eax
4059 movl foo, %reg
4060 addl foo, %reg
4061 We change it into:
4062 movl $foo, %eax
4063 movl $foo, %reg
4064 addl $foo, %reg. */
4065 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4066 if (val == 0xa1)
4067 {
4068 /* movl foo, %eax. */
4069 bfd_put_8 (output_bfd, 0xb8,
4070 contents + rel->r_offset - 1);
4071 }
4072 else
4073 {
4074 unsigned int type;
4075
4076 type = bfd_get_8 (input_bfd,
4077 contents + rel->r_offset - 2);
4078 switch (type)
4079 {
4080 case 0x8b:
4081 /* movl */
4082 bfd_put_8 (output_bfd, 0xc7,
4083 contents + rel->r_offset - 2);
4084 bfd_put_8 (output_bfd,
4085 0xc0 | ((val >> 3) & 7),
4086 contents + rel->r_offset - 1);
4087 break;
4088 case 0x03:
4089 /* addl */
4090 bfd_put_8 (output_bfd, 0x81,
4091 contents + rel->r_offset - 2);
4092 bfd_put_8 (output_bfd,
4093 0xc0 | ((val >> 3) & 7),
4094 contents + rel->r_offset - 1);
4095 break;
4096 default:
4097 BFD_FAIL ();
4098 break;
4099 }
4100 }
4101 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4102 contents + rel->r_offset);
4103 continue;
4104 }
4105 else
4106 {
4107 unsigned int val, type;
4108
4109 /* {IE_32,GOTIE}->LE transition:
4110 Originally it can be one of:
4111 subl foo(%reg1), %reg2
4112 movl foo(%reg1), %reg2
4113 addl foo(%reg1), %reg2
4114 We change it into:
4115 subl $foo, %reg2
4116 movl $foo, %reg2 (6 byte form)
4117 addl $foo, %reg2. */
4118 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4119 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4120 if (type == 0x8b)
4121 {
4122 /* movl */
4123 bfd_put_8 (output_bfd, 0xc7,
4124 contents + rel->r_offset - 2);
4125 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4126 contents + rel->r_offset - 1);
4127 }
4128 else if (type == 0x2b)
4129 {
4130 /* subl */
4131 bfd_put_8 (output_bfd, 0x81,
4132 contents + rel->r_offset - 2);
4133 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4134 contents + rel->r_offset - 1);
4135 }
4136 else if (type == 0x03)
4137 {
4138 /* addl */
4139 bfd_put_8 (output_bfd, 0x81,
4140 contents + rel->r_offset - 2);
4141 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4142 contents + rel->r_offset - 1);
4143 }
4144 else
4145 BFD_FAIL ();
4146 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4147 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4148 contents + rel->r_offset);
4149 else
4150 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4151 contents + rel->r_offset);
4152 continue;
4153 }
4154 }
4155
4156 if (htab->elf.sgot == NULL)
4157 abort ();
4158
4159 if (h != NULL)
4160 {
4161 off = h->got.offset;
4162 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4163 }
4164 else
4165 {
4166 if (local_got_offsets == NULL)
4167 abort ();
4168
4169 off = local_got_offsets[r_symndx];
4170 offplt = local_tlsdesc_gotents[r_symndx];
4171 }
4172
4173 if ((off & 1) != 0)
4174 off &= ~1;
4175 else
4176 {
4177 Elf_Internal_Rela outrel;
4178 int dr_type;
4179 asection *sreloc;
4180
4181 if (htab->elf.srelgot == NULL)
4182 abort ();
4183
4184 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4185
4186 if (GOT_TLS_GDESC_P (tls_type))
4187 {
4188 bfd_byte *loc;
4189 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4190 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4191 <= htab->elf.sgotplt->size);
4192 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4193 + htab->elf.sgotplt->output_offset
4194 + offplt
4195 + htab->sgotplt_jump_table_size);
4196 sreloc = htab->elf.srelplt;
4197 loc = sreloc->contents;
4198 loc += (htab->next_tls_desc_index++
4199 * sizeof (Elf32_External_Rel));
4200 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4201 <= sreloc->contents + sreloc->size);
4202 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4203 if (indx == 0)
4204 {
4205 BFD_ASSERT (! unresolved_reloc);
4206 bfd_put_32 (output_bfd,
4207 relocation - elf_i386_dtpoff_base (info),
4208 htab->elf.sgotplt->contents + offplt
4209 + htab->sgotplt_jump_table_size + 4);
4210 }
4211 else
4212 {
4213 bfd_put_32 (output_bfd, 0,
4214 htab->elf.sgotplt->contents + offplt
4215 + htab->sgotplt_jump_table_size + 4);
4216 }
4217 }
4218
4219 sreloc = htab->elf.srelgot;
4220
4221 outrel.r_offset = (htab->elf.sgot->output_section->vma
4222 + htab->elf.sgot->output_offset + off);
4223
4224 if (GOT_TLS_GD_P (tls_type))
4225 dr_type = R_386_TLS_DTPMOD32;
4226 else if (GOT_TLS_GDESC_P (tls_type))
4227 goto dr_done;
4228 else if (tls_type == GOT_TLS_IE_POS)
4229 dr_type = R_386_TLS_TPOFF;
4230 else
4231 dr_type = R_386_TLS_TPOFF32;
4232
4233 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4234 bfd_put_32 (output_bfd,
4235 relocation - elf_i386_dtpoff_base (info),
4236 htab->elf.sgot->contents + off);
4237 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4238 bfd_put_32 (output_bfd,
4239 elf_i386_dtpoff_base (info) - relocation,
4240 htab->elf.sgot->contents + off);
4241 else if (dr_type != R_386_TLS_DESC)
4242 bfd_put_32 (output_bfd, 0,
4243 htab->elf.sgot->contents + off);
4244 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4245
4246 elf_append_rel (output_bfd, sreloc, &outrel);
4247
4248 if (GOT_TLS_GD_P (tls_type))
4249 {
4250 if (indx == 0)
4251 {
4252 BFD_ASSERT (! unresolved_reloc);
4253 bfd_put_32 (output_bfd,
4254 relocation - elf_i386_dtpoff_base (info),
4255 htab->elf.sgot->contents + off + 4);
4256 }
4257 else
4258 {
4259 bfd_put_32 (output_bfd, 0,
4260 htab->elf.sgot->contents + off + 4);
4261 outrel.r_info = ELF32_R_INFO (indx,
4262 R_386_TLS_DTPOFF32);
4263 outrel.r_offset += 4;
4264 elf_append_rel (output_bfd, sreloc, &outrel);
4265 }
4266 }
4267 else if (tls_type == GOT_TLS_IE_BOTH)
4268 {
4269 bfd_put_32 (output_bfd,
4270 (indx == 0
4271 ? relocation - elf_i386_dtpoff_base (info)
4272 : 0),
4273 htab->elf.sgot->contents + off + 4);
4274 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4275 outrel.r_offset += 4;
4276 elf_append_rel (output_bfd, sreloc, &outrel);
4277 }
4278
4279 dr_done:
4280 if (h != NULL)
4281 h->got.offset |= 1;
4282 else
4283 local_got_offsets[r_symndx] |= 1;
4284 }
4285
4286 if (off >= (bfd_vma) -2
4287 && ! GOT_TLS_GDESC_P (tls_type))
4288 abort ();
4289 if (r_type == R_386_TLS_GOTDESC
4290 || r_type == R_386_TLS_DESC_CALL)
4291 {
4292 relocation = htab->sgotplt_jump_table_size + offplt;
4293 unresolved_reloc = FALSE;
4294 }
4295 else if (r_type == ELF32_R_TYPE (rel->r_info))
4296 {
4297 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4298 + htab->elf.sgotplt->output_offset;
4299 relocation = htab->elf.sgot->output_section->vma
4300 + htab->elf.sgot->output_offset + off - g_o_t;
4301 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4302 && tls_type == GOT_TLS_IE_BOTH)
4303 relocation += 4;
4304 if (r_type == R_386_TLS_IE)
4305 relocation += g_o_t;
4306 unresolved_reloc = FALSE;
4307 }
4308 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4309 {
4310 unsigned int val, type;
4311 bfd_vma roff;
4312
4313 /* GD->IE transition. */
4314 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4315 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4316 if (type == 0x04)
4317 {
4318 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4319 Change it into:
4320 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4321 val >>= 3;
4322 roff = rel->r_offset - 3;
4323 }
4324 else
4325 {
4326 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4327 Change it into:
4328 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4329 roff = rel->r_offset - 2;
4330 }
4331 memcpy (contents + roff,
4332 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4333 contents[roff + 7] = 0x80 | (val & 7);
4334 /* If foo is used only with foo@gotntpoff(%reg) and
4335 foo@indntpoff, but not with foo@gottpoff(%reg), change
4336 subl $foo@gottpoff(%reg), %eax
4337 into:
4338 addl $foo@gotntpoff(%reg), %eax. */
4339 if (tls_type == GOT_TLS_IE_POS)
4340 contents[roff + 6] = 0x03;
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 + 8);
4347 /* Skip R_386_PLT32. */
4348 rel++;
4349 continue;
4350 }
4351 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4352 {
4353 /* GDesc -> IE transition.
4354 It's originally something like:
4355 leal x@tlsdesc(%ebx), %eax
4356
4357 Change it to:
4358 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4359 or:
4360 movl x@gottpoff(%ebx), %eax # before negl %eax
4361
4362 Registers other than %eax may be set up here. */
4363
4364 bfd_vma roff;
4365
4366 /* First, make sure it's a leal adding ebx to a 32-bit
4367 offset into any register, although it's probably
4368 almost always going to be eax. */
4369 roff = rel->r_offset;
4370
4371 /* Now modify the instruction as appropriate. */
4372 /* To turn a leal into a movl in the form we use it, it
4373 suffices to change the first byte from 0x8d to 0x8b.
4374 aoliva FIXME: should we decide to keep the leal, all
4375 we have to do is remove the statement below, and
4376 adjust the relaxation of R_386_TLS_DESC_CALL. */
4377 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4378
4379 if (tls_type == GOT_TLS_IE_BOTH)
4380 off += 4;
4381
4382 bfd_put_32 (output_bfd,
4383 htab->elf.sgot->output_section->vma
4384 + htab->elf.sgot->output_offset + off
4385 - htab->elf.sgotplt->output_section->vma
4386 - htab->elf.sgotplt->output_offset,
4387 contents + roff);
4388 continue;
4389 }
4390 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4391 {
4392 /* GDesc -> IE transition.
4393 It's originally:
4394 call *(%eax)
4395
4396 Change it to:
4397 xchg %ax,%ax
4398 or
4399 negl %eax
4400 depending on how we transformed the TLS_GOTDESC above.
4401 */
4402
4403 bfd_vma roff;
4404
4405 roff = rel->r_offset;
4406
4407 /* Now modify the instruction as appropriate. */
4408 if (tls_type != GOT_TLS_IE_NEG)
4409 {
4410 /* xchg %ax,%ax */
4411 bfd_put_8 (output_bfd, 0x66, contents + roff);
4412 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4413 }
4414 else
4415 {
4416 /* negl %eax */
4417 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4418 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4419 }
4420
4421 continue;
4422 }
4423 else
4424 BFD_ASSERT (FALSE);
4425 break;
4426
4427 case R_386_TLS_LDM:
4428 if (! elf_i386_tls_transition (info, input_bfd,
4429 input_section, contents,
4430 symtab_hdr, sym_hashes,
4431 &r_type, GOT_UNKNOWN, rel,
4432 relend, h, r_symndx))
4433 return FALSE;
4434
4435 if (r_type != R_386_TLS_LDM)
4436 {
4437 /* LD->LE transition:
4438 leal foo(%reg), %eax; call ___tls_get_addr.
4439 We change it into:
4440 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4441 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4442 memcpy (contents + rel->r_offset - 2,
4443 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4444 /* Skip R_386_PC32/R_386_PLT32. */
4445 rel++;
4446 continue;
4447 }
4448
4449 if (htab->elf.sgot == NULL)
4450 abort ();
4451
4452 off = htab->tls_ldm_got.offset;
4453 if (off & 1)
4454 off &= ~1;
4455 else
4456 {
4457 Elf_Internal_Rela outrel;
4458
4459 if (htab->elf.srelgot == NULL)
4460 abort ();
4461
4462 outrel.r_offset = (htab->elf.sgot->output_section->vma
4463 + htab->elf.sgot->output_offset + off);
4464
4465 bfd_put_32 (output_bfd, 0,
4466 htab->elf.sgot->contents + off);
4467 bfd_put_32 (output_bfd, 0,
4468 htab->elf.sgot->contents + off + 4);
4469 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4470 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4471 htab->tls_ldm_got.offset |= 1;
4472 }
4473 relocation = htab->elf.sgot->output_section->vma
4474 + htab->elf.sgot->output_offset + off
4475 - htab->elf.sgotplt->output_section->vma
4476 - htab->elf.sgotplt->output_offset;
4477 unresolved_reloc = FALSE;
4478 break;
4479
4480 case R_386_TLS_LDO_32:
4481 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4482 relocation -= elf_i386_dtpoff_base (info);
4483 else
4484 /* When converting LDO to LE, we must negate. */
4485 relocation = -elf_i386_tpoff (info, relocation);
4486 break;
4487
4488 case R_386_TLS_LE_32:
4489 case R_386_TLS_LE:
4490 if (!info->executable)
4491 {
4492 Elf_Internal_Rela outrel;
4493 asection *sreloc;
4494
4495 outrel.r_offset = rel->r_offset
4496 + input_section->output_section->vma
4497 + input_section->output_offset;
4498 if (h != NULL && h->dynindx != -1)
4499 indx = h->dynindx;
4500 else
4501 indx = 0;
4502 if (r_type == R_386_TLS_LE_32)
4503 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4504 else
4505 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4506 sreloc = elf_section_data (input_section)->sreloc;
4507 if (sreloc == NULL)
4508 abort ();
4509 elf_append_rel (output_bfd, sreloc, &outrel);
4510 if (indx)
4511 continue;
4512 else if (r_type == R_386_TLS_LE_32)
4513 relocation = elf_i386_dtpoff_base (info) - relocation;
4514 else
4515 relocation -= elf_i386_dtpoff_base (info);
4516 }
4517 else if (r_type == R_386_TLS_LE_32)
4518 relocation = elf_i386_tpoff (info, relocation);
4519 else
4520 relocation = -elf_i386_tpoff (info, relocation);
4521 break;
4522
4523 default:
4524 break;
4525 }
4526
4527 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4528 because such sections are not SEC_ALLOC and thus ld.so will
4529 not process them. */
4530 if (unresolved_reloc
4531 && !((input_section->flags & SEC_DEBUGGING) != 0
4532 && h->def_dynamic)
4533 && _bfd_elf_section_offset (output_bfd, info, input_section,
4534 rel->r_offset) != (bfd_vma) -1)
4535 {
4536 (*_bfd_error_handler)
4537 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4538 input_bfd,
4539 input_section,
4540 (long) rel->r_offset,
4541 howto->name,
4542 h->root.root.string);
4543 return FALSE;
4544 }
4545
4546 do_relocation:
4547 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4548 contents, rel->r_offset,
4549 relocation, 0);
4550
4551 check_relocation_error:
4552 if (r != bfd_reloc_ok)
4553 {
4554 const char *name;
4555
4556 if (h != NULL)
4557 name = h->root.root.string;
4558 else
4559 {
4560 name = bfd_elf_string_from_elf_section (input_bfd,
4561 symtab_hdr->sh_link,
4562 sym->st_name);
4563 if (name == NULL)
4564 return FALSE;
4565 if (*name == '\0')
4566 name = bfd_section_name (input_bfd, sec);
4567 }
4568
4569 if (r == bfd_reloc_overflow)
4570 {
4571 if (! ((*info->callbacks->reloc_overflow)
4572 (info, (h ? &h->root : NULL), name, howto->name,
4573 (bfd_vma) 0, input_bfd, input_section,
4574 rel->r_offset)))
4575 return FALSE;
4576 }
4577 else
4578 {
4579 (*_bfd_error_handler)
4580 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4581 input_bfd, input_section,
4582 (long) rel->r_offset, name, (int) r);
4583 return FALSE;
4584 }
4585 }
4586 }
4587
4588 return TRUE;
4589 }
4590
4591 /* Finish up dynamic symbol handling. We set the contents of various
4592 dynamic sections here. */
4593
4594 static bfd_boolean
4595 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4596 struct bfd_link_info *info,
4597 struct elf_link_hash_entry *h,
4598 Elf_Internal_Sym *sym)
4599 {
4600 struct elf_i386_link_hash_table *htab;
4601 unsigned plt_entry_size;
4602 const struct elf_i386_backend_data *abed;
4603 struct elf_i386_link_hash_entry *eh;
4604
4605 htab = elf_i386_hash_table (info);
4606 if (htab == NULL)
4607 return FALSE;
4608
4609 abed = get_elf_i386_backend_data (output_bfd);
4610 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4611
4612 eh = (struct elf_i386_link_hash_entry *) h;
4613
4614 if (h->plt.offset != (bfd_vma) -1)
4615 {
4616 bfd_vma plt_index;
4617 bfd_vma got_offset;
4618 Elf_Internal_Rela rel;
4619 bfd_byte *loc;
4620 asection *plt, *gotplt, *relplt;
4621
4622 /* When building a static executable, use .iplt, .igot.plt and
4623 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4624 if (htab->elf.splt != NULL)
4625 {
4626 plt = htab->elf.splt;
4627 gotplt = htab->elf.sgotplt;
4628 relplt = htab->elf.srelplt;
4629 }
4630 else
4631 {
4632 plt = htab->elf.iplt;
4633 gotplt = htab->elf.igotplt;
4634 relplt = htab->elf.irelplt;
4635 }
4636
4637 /* This symbol has an entry in the procedure linkage table. Set
4638 it up. */
4639
4640 if ((h->dynindx == -1
4641 && !((h->forced_local || info->executable)
4642 && h->def_regular
4643 && h->type == STT_GNU_IFUNC))
4644 || plt == NULL
4645 || gotplt == NULL
4646 || relplt == NULL)
4647 abort ();
4648
4649 /* Get the index in the procedure linkage table which
4650 corresponds to this symbol. This is the index of this symbol
4651 in all the symbols for which we are making plt entries. The
4652 first entry in the procedure linkage table is reserved.
4653
4654 Get the offset into the .got table of the entry that
4655 corresponds to this function. Each .got entry is 4 bytes.
4656 The first three are reserved.
4657
4658 For static executables, we don't reserve anything. */
4659
4660 if (plt == htab->elf.splt)
4661 {
4662 got_offset = h->plt.offset / plt_entry_size - 1;
4663 got_offset = (got_offset + 3) * 4;
4664 }
4665 else
4666 {
4667 got_offset = h->plt.offset / plt_entry_size;
4668 got_offset = got_offset * 4;
4669 }
4670
4671 /* Fill in the entry in the procedure linkage table. */
4672 if (! info->shared)
4673 {
4674 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4675 abed->plt->plt_entry_size);
4676 bfd_put_32 (output_bfd,
4677 (gotplt->output_section->vma
4678 + gotplt->output_offset
4679 + got_offset),
4680 plt->contents + h->plt.offset
4681 + abed->plt->plt_got_offset);
4682
4683 if (abed->is_vxworks)
4684 {
4685 int s, k, reloc_index;
4686
4687 /* Create the R_386_32 relocation referencing the GOT
4688 for this PLT entry. */
4689
4690 /* S: Current slot number (zero-based). */
4691 s = ((h->plt.offset - abed->plt->plt_entry_size)
4692 / abed->plt->plt_entry_size);
4693 /* K: Number of relocations for PLTResolve. */
4694 if (info->shared)
4695 k = PLTRESOLVE_RELOCS_SHLIB;
4696 else
4697 k = PLTRESOLVE_RELOCS;
4698 /* Skip the PLTresolve relocations, and the relocations for
4699 the other PLT slots. */
4700 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4701 loc = (htab->srelplt2->contents + reloc_index
4702 * sizeof (Elf32_External_Rel));
4703
4704 rel.r_offset = (htab->elf.splt->output_section->vma
4705 + htab->elf.splt->output_offset
4706 + h->plt.offset + 2),
4707 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4708 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4709
4710 /* Create the R_386_32 relocation referencing the beginning of
4711 the PLT for this GOT entry. */
4712 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4713 + htab->elf.sgotplt->output_offset
4714 + got_offset);
4715 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4716 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4717 loc + sizeof (Elf32_External_Rel));
4718 }
4719 }
4720 else
4721 {
4722 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4723 abed->plt->plt_entry_size);
4724 bfd_put_32 (output_bfd, got_offset,
4725 plt->contents + h->plt.offset
4726 + abed->plt->plt_got_offset);
4727 }
4728
4729 /* Fill in the entry in the global offset table. */
4730 bfd_put_32 (output_bfd,
4731 (plt->output_section->vma
4732 + plt->output_offset
4733 + h->plt.offset
4734 + abed->plt->plt_lazy_offset),
4735 gotplt->contents + got_offset);
4736
4737 /* Fill in the entry in the .rel.plt section. */
4738 rel.r_offset = (gotplt->output_section->vma
4739 + gotplt->output_offset
4740 + got_offset);
4741 if (h->dynindx == -1
4742 || ((info->executable
4743 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4744 && h->def_regular
4745 && h->type == STT_GNU_IFUNC))
4746 {
4747 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4748 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4749 in the .got.plt section. */
4750 bfd_put_32 (output_bfd,
4751 (h->root.u.def.value
4752 + h->root.u.def.section->output_section->vma
4753 + h->root.u.def.section->output_offset),
4754 gotplt->contents + got_offset);
4755 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4756 /* R_386_IRELATIVE comes last. */
4757 plt_index = htab->next_irelative_index--;
4758 }
4759 else
4760 {
4761 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4762 plt_index = htab->next_jump_slot_index++;
4763 }
4764 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4765 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4766
4767 /* Don't fill PLT entry for static executables. */
4768 if (plt == htab->elf.splt)
4769 {
4770 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4771 plt->contents + h->plt.offset
4772 + abed->plt->plt_reloc_offset);
4773 bfd_put_32 (output_bfd, - (h->plt.offset
4774 + abed->plt->plt_plt_offset + 4),
4775 plt->contents + h->plt.offset
4776 + abed->plt->plt_plt_offset);
4777 }
4778 }
4779 else if (eh->plt_got.offset != (bfd_vma) -1)
4780 {
4781 bfd_vma got_offset, plt_offset;
4782 asection *plt, *got, *gotplt;
4783 const bfd_byte *got_plt_entry;
4784
4785 /* Offset of displacement of the indirect jump. */
4786 bfd_vma plt_got_offset = 2;
4787
4788 /* Set the entry in the GOT procedure linkage table. */
4789 plt = htab->plt_got;
4790 got = htab->elf.sgot;
4791 gotplt = htab->elf.sgotplt;
4792 got_offset = h->got.offset;
4793
4794 if (got_offset == (bfd_vma) -1
4795 || plt == NULL
4796 || got == NULL
4797 || gotplt == NULL)
4798 abort ();
4799
4800 /* Fill in the entry in the GOT procedure linkage table. */
4801 if (! info->shared)
4802 {
4803 got_plt_entry = elf_i386_got_plt_entry;
4804 got_offset += got->output_section->vma + got->output_offset;
4805 }
4806 else
4807 {
4808 got_plt_entry = elf_i386_pic_got_plt_entry;
4809 got_offset += (got->output_section->vma
4810 + got->output_offset
4811 - gotplt->output_section->vma
4812 - gotplt->output_offset);
4813 }
4814
4815 plt_offset = eh->plt_got.offset;
4816 memcpy (plt->contents + plt_offset, got_plt_entry,
4817 sizeof (elf_i386_got_plt_entry));
4818 bfd_put_32 (output_bfd, got_offset,
4819 plt->contents + plt_offset + plt_got_offset);
4820 }
4821
4822 if (!h->def_regular
4823 && (h->plt.offset != (bfd_vma) -1
4824 || eh->plt_got.offset != (bfd_vma) -1))
4825 {
4826 /* Mark the symbol as undefined, rather than as defined in
4827 the .plt section. Leave the value if there were any
4828 relocations where pointer equality matters (this is a clue
4829 for the dynamic linker, to make function pointer
4830 comparisons work between an application and shared
4831 library), otherwise set it to zero. If a function is only
4832 called from a binary, there is no need to slow down
4833 shared libraries because of that. */
4834 sym->st_shndx = SHN_UNDEF;
4835 if (!h->pointer_equality_needed)
4836 sym->st_value = 0;
4837 }
4838
4839 if (h->got.offset != (bfd_vma) -1
4840 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4841 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4842 {
4843 Elf_Internal_Rela rel;
4844
4845 /* This symbol has an entry in the global offset table. Set it
4846 up. */
4847
4848 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4849 abort ();
4850
4851 rel.r_offset = (htab->elf.sgot->output_section->vma
4852 + htab->elf.sgot->output_offset
4853 + (h->got.offset & ~(bfd_vma) 1));
4854
4855 /* If this is a static link, or it is a -Bsymbolic link and the
4856 symbol is defined locally or was forced to be local because
4857 of a version file, we just want to emit a RELATIVE reloc.
4858 The entry in the global offset table will already have been
4859 initialized in the relocate_section function. */
4860 if (h->def_regular
4861 && h->type == STT_GNU_IFUNC)
4862 {
4863 if (info->shared)
4864 {
4865 /* Generate R_386_GLOB_DAT. */
4866 goto do_glob_dat;
4867 }
4868 else
4869 {
4870 asection *plt;
4871
4872 if (!h->pointer_equality_needed)
4873 abort ();
4874
4875 /* For non-shared object, we can't use .got.plt, which
4876 contains the real function addres if we need pointer
4877 equality. We load the GOT entry with the PLT entry. */
4878 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4879 bfd_put_32 (output_bfd,
4880 (plt->output_section->vma
4881 + plt->output_offset + h->plt.offset),
4882 htab->elf.sgot->contents + h->got.offset);
4883 return TRUE;
4884 }
4885 }
4886 else if (info->shared
4887 && SYMBOL_REFERENCES_LOCAL (info, h))
4888 {
4889 BFD_ASSERT((h->got.offset & 1) != 0);
4890 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4891 }
4892 else
4893 {
4894 BFD_ASSERT((h->got.offset & 1) == 0);
4895 do_glob_dat:
4896 bfd_put_32 (output_bfd, (bfd_vma) 0,
4897 htab->elf.sgot->contents + h->got.offset);
4898 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4899 }
4900
4901 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4902 }
4903
4904 if (h->needs_copy)
4905 {
4906 Elf_Internal_Rela rel;
4907
4908 /* This symbol needs a copy reloc. Set it up. */
4909
4910 if (h->dynindx == -1
4911 || (h->root.type != bfd_link_hash_defined
4912 && h->root.type != bfd_link_hash_defweak)
4913 || htab->srelbss == NULL)
4914 abort ();
4915
4916 rel.r_offset = (h->root.u.def.value
4917 + h->root.u.def.section->output_section->vma
4918 + h->root.u.def.section->output_offset);
4919 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4920 elf_append_rel (output_bfd, htab->srelbss, &rel);
4921 }
4922
4923 return TRUE;
4924 }
4925
4926 /* Finish up local dynamic symbol handling. We set the contents of
4927 various dynamic sections here. */
4928
4929 static bfd_boolean
4930 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4931 {
4932 struct elf_link_hash_entry *h
4933 = (struct elf_link_hash_entry *) *slot;
4934 struct bfd_link_info *info
4935 = (struct bfd_link_info *) inf;
4936
4937 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4938 h, NULL);
4939 }
4940
4941 /* Used to decide how to sort relocs in an optimal manner for the
4942 dynamic linker, before writing them out. */
4943
4944 static enum elf_reloc_type_class
4945 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4946 const asection *rel_sec ATTRIBUTE_UNUSED,
4947 const Elf_Internal_Rela *rela)
4948 {
4949 switch (ELF32_R_TYPE (rela->r_info))
4950 {
4951 case R_386_RELATIVE:
4952 return reloc_class_relative;
4953 case R_386_JUMP_SLOT:
4954 return reloc_class_plt;
4955 case R_386_COPY:
4956 return reloc_class_copy;
4957 default:
4958 return reloc_class_normal;
4959 }
4960 }
4961
4962 /* Finish up the dynamic sections. */
4963
4964 static bfd_boolean
4965 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4966 struct bfd_link_info *info)
4967 {
4968 struct elf_i386_link_hash_table *htab;
4969 bfd *dynobj;
4970 asection *sdyn;
4971 const struct elf_i386_backend_data *abed;
4972
4973 htab = elf_i386_hash_table (info);
4974 if (htab == NULL)
4975 return FALSE;
4976
4977 dynobj = htab->elf.dynobj;
4978 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4979 abed = get_elf_i386_backend_data (output_bfd);
4980
4981 if (htab->elf.dynamic_sections_created)
4982 {
4983 Elf32_External_Dyn *dyncon, *dynconend;
4984
4985 if (sdyn == NULL || htab->elf.sgot == NULL)
4986 abort ();
4987
4988 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4989 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4990 for (; dyncon < dynconend; dyncon++)
4991 {
4992 Elf_Internal_Dyn dyn;
4993 asection *s;
4994
4995 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4996
4997 switch (dyn.d_tag)
4998 {
4999 default:
5000 if (abed->is_vxworks
5001 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5002 break;
5003 continue;
5004
5005 case DT_PLTGOT:
5006 s = htab->elf.sgotplt;
5007 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5008 break;
5009
5010 case DT_JMPREL:
5011 s = htab->elf.srelplt;
5012 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5013 break;
5014
5015 case DT_PLTRELSZ:
5016 s = htab->elf.srelplt;
5017 dyn.d_un.d_val = s->size;
5018 break;
5019
5020 case DT_RELSZ:
5021 /* My reading of the SVR4 ABI indicates that the
5022 procedure linkage table relocs (DT_JMPREL) should be
5023 included in the overall relocs (DT_REL). This is
5024 what Solaris does. However, UnixWare can not handle
5025 that case. Therefore, we override the DT_RELSZ entry
5026 here to make it not include the JMPREL relocs. */
5027 s = htab->elf.srelplt;
5028 if (s == NULL)
5029 continue;
5030 dyn.d_un.d_val -= s->size;
5031 break;
5032
5033 case DT_REL:
5034 /* We may not be using the standard ELF linker script.
5035 If .rel.plt is the first .rel section, we adjust
5036 DT_REL to not include it. */
5037 s = htab->elf.srelplt;
5038 if (s == NULL)
5039 continue;
5040 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5041 continue;
5042 dyn.d_un.d_ptr += s->size;
5043 break;
5044 }
5045
5046 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5047 }
5048
5049 /* Fill in the first entry in the procedure linkage table. */
5050 if (htab->elf.splt && htab->elf.splt->size > 0)
5051 {
5052 if (info->shared)
5053 {
5054 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5055 abed->plt->plt0_entry_size);
5056 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5057 abed->plt0_pad_byte,
5058 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5059 }
5060 else
5061 {
5062 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5063 abed->plt->plt0_entry_size);
5064 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5065 abed->plt0_pad_byte,
5066 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5067 bfd_put_32 (output_bfd,
5068 (htab->elf.sgotplt->output_section->vma
5069 + htab->elf.sgotplt->output_offset
5070 + 4),
5071 htab->elf.splt->contents
5072 + abed->plt->plt0_got1_offset);
5073 bfd_put_32 (output_bfd,
5074 (htab->elf.sgotplt->output_section->vma
5075 + htab->elf.sgotplt->output_offset
5076 + 8),
5077 htab->elf.splt->contents
5078 + abed->plt->plt0_got2_offset);
5079
5080 if (abed->is_vxworks)
5081 {
5082 Elf_Internal_Rela rel;
5083
5084 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5085 On IA32 we use REL relocations so the addend goes in
5086 the PLT directly. */
5087 rel.r_offset = (htab->elf.splt->output_section->vma
5088 + htab->elf.splt->output_offset
5089 + abed->plt->plt0_got1_offset);
5090 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5091 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5092 htab->srelplt2->contents);
5093 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5094 rel.r_offset = (htab->elf.splt->output_section->vma
5095 + htab->elf.splt->output_offset
5096 + abed->plt->plt0_got2_offset);
5097 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5098 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5099 htab->srelplt2->contents +
5100 sizeof (Elf32_External_Rel));
5101 }
5102 }
5103
5104 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5105 really seem like the right value. */
5106 elf_section_data (htab->elf.splt->output_section)
5107 ->this_hdr.sh_entsize = 4;
5108
5109 /* Correct the .rel.plt.unloaded relocations. */
5110 if (abed->is_vxworks && !info->shared)
5111 {
5112 int num_plts = (htab->elf.splt->size
5113 / abed->plt->plt_entry_size) - 1;
5114 unsigned char *p;
5115
5116 p = htab->srelplt2->contents;
5117 if (info->shared)
5118 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5119 else
5120 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5121
5122 for (; num_plts; num_plts--)
5123 {
5124 Elf_Internal_Rela rel;
5125 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5126 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5127 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5128 p += sizeof (Elf32_External_Rel);
5129
5130 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5131 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5132 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5133 p += sizeof (Elf32_External_Rel);
5134 }
5135 }
5136 }
5137 }
5138
5139 if (htab->elf.sgotplt)
5140 {
5141 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5142 {
5143 (*_bfd_error_handler)
5144 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5145 return FALSE;
5146 }
5147
5148 /* Fill in the first three entries in the global offset table. */
5149 if (htab->elf.sgotplt->size > 0)
5150 {
5151 bfd_put_32 (output_bfd,
5152 (sdyn == NULL ? 0
5153 : sdyn->output_section->vma + sdyn->output_offset),
5154 htab->elf.sgotplt->contents);
5155 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5156 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5157 }
5158
5159 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5160 }
5161
5162 /* Adjust .eh_frame for .plt section. */
5163 if (htab->plt_eh_frame != NULL
5164 && htab->plt_eh_frame->contents != NULL)
5165 {
5166 if (htab->elf.splt != NULL
5167 && htab->elf.splt->size != 0
5168 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5169 && htab->elf.splt->output_section != NULL
5170 && htab->plt_eh_frame->output_section != NULL)
5171 {
5172 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5173 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5174 + htab->plt_eh_frame->output_offset
5175 + PLT_FDE_START_OFFSET;
5176 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5177 htab->plt_eh_frame->contents
5178 + PLT_FDE_START_OFFSET);
5179 }
5180 if (htab->plt_eh_frame->sec_info_type
5181 == SEC_INFO_TYPE_EH_FRAME)
5182 {
5183 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5184 htab->plt_eh_frame,
5185 htab->plt_eh_frame->contents))
5186 return FALSE;
5187 }
5188 }
5189
5190 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5191 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5192
5193 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5194 htab_traverse (htab->loc_hash_table,
5195 elf_i386_finish_local_dynamic_symbol,
5196 info);
5197
5198 return TRUE;
5199 }
5200
5201 /* Return an array of PLT entry symbol values. */
5202
5203 static bfd_vma *
5204 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5205 asection *relplt)
5206 {
5207 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5208 arelent *p;
5209 long count, i;
5210 bfd_vma *plt_sym_val;
5211 bfd_vma plt_offset;
5212 bfd_byte *plt_contents;
5213 const struct elf_i386_backend_data *bed
5214 = get_elf_i386_backend_data (abfd);
5215 Elf_Internal_Shdr *hdr;
5216
5217 /* Get the .plt section contents. */
5218 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5219 if (plt_contents == NULL)
5220 return NULL;
5221 if (!bfd_get_section_contents (abfd, (asection *) plt,
5222 plt_contents, 0, plt->size))
5223 {
5224 bad_return:
5225 free (plt_contents);
5226 return NULL;
5227 }
5228
5229 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5230 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5231 goto bad_return;
5232
5233 hdr = &elf_section_data (relplt)->this_hdr;
5234 count = relplt->size / hdr->sh_entsize;
5235
5236 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5237 if (plt_sym_val == NULL)
5238 goto bad_return;
5239
5240 for (i = 0; i < count; i++)
5241 plt_sym_val[i] = -1;
5242
5243 plt_offset = bed->plt->plt_entry_size;
5244 p = relplt->relocation;
5245 for (i = 0; i < count; i++, p++)
5246 {
5247 long reloc_index;
5248
5249 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5250 if (p->howto == NULL)
5251 continue;
5252
5253 if (p->howto->type != R_386_JUMP_SLOT
5254 && p->howto->type != R_386_IRELATIVE)
5255 continue;
5256
5257 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5258 + bed->plt->plt_reloc_offset));
5259 reloc_index /= sizeof (Elf32_External_Rel);
5260 if (reloc_index >= count)
5261 abort ();
5262 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5263 plt_offset += bed->plt->plt_entry_size;
5264
5265 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5266 section. */
5267 if (plt_offset >= plt->size)
5268 break;
5269 }
5270
5271 free (plt_contents);
5272
5273 return plt_sym_val;
5274 }
5275
5276 /* Similar to _bfd_elf_get_synthetic_symtab. */
5277
5278 static long
5279 elf_i386_get_synthetic_symtab (bfd *abfd,
5280 long symcount,
5281 asymbol **syms,
5282 long dynsymcount,
5283 asymbol **dynsyms,
5284 asymbol **ret)
5285 {
5286 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5287 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5288 dynsymcount, dynsyms, ret,
5289 plt,
5290 elf_i386_get_plt_sym_val);
5291 }
5292
5293 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5294
5295 static bfd_boolean
5296 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5297 {
5298 if (h->plt.offset != (bfd_vma) -1
5299 && !h->def_regular
5300 && !h->pointer_equality_needed)
5301 return FALSE;
5302
5303 return _bfd_elf_hash_symbol (h);
5304 }
5305
5306 /* Hook called by the linker routine which adds symbols from an object
5307 file. */
5308
5309 static bfd_boolean
5310 elf_i386_add_symbol_hook (bfd * abfd,
5311 struct bfd_link_info * info,
5312 Elf_Internal_Sym * sym,
5313 const char ** namep ATTRIBUTE_UNUSED,
5314 flagword * flagsp ATTRIBUTE_UNUSED,
5315 asection ** secp ATTRIBUTE_UNUSED,
5316 bfd_vma * valp ATTRIBUTE_UNUSED)
5317 {
5318 if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5319 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
5320 && (abfd->flags & DYNAMIC) == 0
5321 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5322 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5323
5324 return TRUE;
5325 }
5326
5327 #define TARGET_LITTLE_SYM i386_elf32_vec
5328 #define TARGET_LITTLE_NAME "elf32-i386"
5329 #define ELF_ARCH bfd_arch_i386
5330 #define ELF_TARGET_ID I386_ELF_DATA
5331 #define ELF_MACHINE_CODE EM_386
5332 #define ELF_MAXPAGESIZE 0x1000
5333
5334 #define elf_backend_can_gc_sections 1
5335 #define elf_backend_can_refcount 1
5336 #define elf_backend_want_got_plt 1
5337 #define elf_backend_plt_readonly 1
5338 #define elf_backend_want_plt_sym 0
5339 #define elf_backend_got_header_size 12
5340 #define elf_backend_plt_alignment 4
5341 #define elf_backend_extern_protected_data 1
5342
5343 /* Support RELA for objdump of prelink objects. */
5344 #define elf_info_to_howto elf_i386_info_to_howto_rel
5345 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5346
5347 #define bfd_elf32_mkobject elf_i386_mkobject
5348
5349 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5350 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5351 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5352 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5353 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5354
5355 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5356 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5357 #define elf_backend_check_relocs elf_i386_check_relocs
5358 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5359 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5360 #define elf_backend_fake_sections elf_i386_fake_sections
5361 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5362 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5363 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5364 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5365 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5366 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5367 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5368 #define elf_backend_relocate_section elf_i386_relocate_section
5369 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5370 #define elf_backend_always_size_sections elf_i386_always_size_sections
5371 #define elf_backend_omit_section_dynsym \
5372 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5373 #define elf_backend_hash_symbol elf_i386_hash_symbol
5374 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5375
5376 #include "elf32-target.h"
5377
5378 /* FreeBSD support. */
5379
5380 #undef TARGET_LITTLE_SYM
5381 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5382 #undef TARGET_LITTLE_NAME
5383 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5384 #undef ELF_OSABI
5385 #define ELF_OSABI ELFOSABI_FREEBSD
5386
5387 /* The kernel recognizes executables as valid only if they carry a
5388 "FreeBSD" label in the ELF header. So we put this label on all
5389 executables and (for simplicity) also all other object files. */
5390
5391 static void
5392 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5393 {
5394 _bfd_elf_post_process_headers (abfd, info);
5395
5396 #ifdef OLD_FREEBSD_ABI_LABEL
5397 {
5398 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5399 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5400 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5401 }
5402 #endif
5403 }
5404
5405 #undef elf_backend_post_process_headers
5406 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5407 #undef elf32_bed
5408 #define elf32_bed elf32_i386_fbsd_bed
5409
5410 #undef elf_backend_add_symbol_hook
5411
5412 #include "elf32-target.h"
5413
5414 /* Solaris 2. */
5415
5416 #undef TARGET_LITTLE_SYM
5417 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5418 #undef TARGET_LITTLE_NAME
5419 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5420
5421 #undef elf_backend_post_process_headers
5422
5423 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5424 objects won't be recognized. */
5425 #undef ELF_OSABI
5426
5427 #undef elf32_bed
5428 #define elf32_bed elf32_i386_sol2_bed
5429
5430 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5431 boundary. */
5432 #undef elf_backend_static_tls_alignment
5433 #define elf_backend_static_tls_alignment 8
5434
5435 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5436
5437 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5438 File, p.63. */
5439 #undef elf_backend_want_plt_sym
5440 #define elf_backend_want_plt_sym 1
5441
5442 #include "elf32-target.h"
5443
5444 /* Intel MCU support. */
5445
5446 static bfd_boolean
5447 elf32_iamcu_elf_object_p (bfd *abfd)
5448 {
5449 /* Set the right machine number for an IAMCU elf32 file. */
5450 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5451 return TRUE;
5452 }
5453
5454 #undef TARGET_LITTLE_SYM
5455 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5456 #undef TARGET_LITTLE_NAME
5457 #define TARGET_LITTLE_NAME "elf32-iamcu"
5458 #undef ELF_ARCH
5459 #define ELF_ARCH bfd_arch_iamcu
5460
5461 #undef ELF_MACHINE_CODE
5462 #define ELF_MACHINE_CODE EM_IAMCU
5463
5464 #undef ELF_OSABI
5465
5466 #undef elf32_bed
5467 #define elf32_bed elf32_iamcu_bed
5468
5469 #undef elf_backend_object_p
5470 #define elf_backend_object_p elf32_iamcu_elf_object_p
5471
5472 #undef elf_backend_static_tls_alignment
5473
5474 #undef elf_backend_want_plt_sym
5475 #define elf_backend_want_plt_sym 0
5476
5477 #include "elf32-target.h"
5478
5479 /* Restore defaults. */
5480 #undef ELF_ARCH
5481 #define ELF_ARCH bfd_arch_i386
5482 #undef ELF_MACHINE_CODE
5483 #define ELF_MACHINE_CODE EM_386
5484
5485 /* Native Client support. */
5486
5487 #undef TARGET_LITTLE_SYM
5488 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5489 #undef TARGET_LITTLE_NAME
5490 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5491 #undef elf32_bed
5492 #define elf32_bed elf32_i386_nacl_bed
5493
5494 #undef ELF_MAXPAGESIZE
5495 #define ELF_MAXPAGESIZE 0x10000
5496
5497 /* Restore defaults. */
5498 #undef ELF_OSABI
5499 #undef elf_backend_want_plt_sym
5500 #define elf_backend_want_plt_sym 0
5501 #undef elf_backend_post_process_headers
5502 #undef elf_backend_static_tls_alignment
5503
5504 /* NaCl uses substantially different PLT entries for the same effects. */
5505
5506 #undef elf_backend_plt_alignment
5507 #define elf_backend_plt_alignment 5
5508 #define NACL_PLT_ENTRY_SIZE 64
5509 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5510
5511 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5512 {
5513 0xff, 0x35, /* pushl contents of address */
5514 0, 0, 0, 0, /* replaced with address of .got + 4. */
5515 0x8b, 0x0d, /* movl contents of address, %ecx */
5516 0, 0, 0, 0, /* replaced with address of .got + 8. */
5517 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5518 0xff, 0xe1 /* jmp *%ecx */
5519 };
5520
5521 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5522 {
5523 0x8b, 0x0d, /* movl contents of address, %ecx */
5524 0, 0, 0, 0, /* replaced with GOT slot address. */
5525 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5526 0xff, 0xe1, /* jmp *%ecx */
5527
5528 /* Pad to the next 32-byte boundary with nop instructions. */
5529 0x90,
5530 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5531 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5532
5533 /* Lazy GOT entries point here (32-byte aligned). */
5534 0x68, /* pushl immediate */
5535 0, 0, 0, 0, /* replaced with reloc offset. */
5536 0xe9, /* jmp relative */
5537 0, 0, 0, 0, /* replaced with offset to .plt. */
5538
5539 /* Pad to the next 32-byte boundary with nop instructions. */
5540 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5541 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5542 0x90, 0x90
5543 };
5544
5545 static const bfd_byte
5546 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5547 {
5548 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5549 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5550 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5551 0xff, 0xe1, /* jmp *%ecx */
5552
5553 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5554 so pad to that size with nop instructions. */
5555 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5556 };
5557
5558 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5559 {
5560 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5561 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5562 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5563 0xff, 0xe1, /* jmp *%ecx */
5564
5565 /* Pad to the next 32-byte boundary with nop instructions. */
5566 0x90,
5567 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5568 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5569
5570 /* Lazy GOT entries point here (32-byte aligned). */
5571 0x68, /* pushl immediate */
5572 0, 0, 0, 0, /* replaced with offset into relocation table. */
5573 0xe9, /* jmp relative */
5574 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5575
5576 /* Pad to the next 32-byte boundary with nop instructions. */
5577 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5578 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5579 0x90, 0x90
5580 };
5581
5582 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5583 {
5584 #if (PLT_CIE_LENGTH != 20 \
5585 || PLT_FDE_LENGTH != 36 \
5586 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5587 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5588 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5589 #endif
5590 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5591 0, 0, 0, 0, /* CIE ID */
5592 1, /* CIE version */
5593 'z', 'R', 0, /* Augmentation string */
5594 1, /* Code alignment factor */
5595 0x7c, /* Data alignment factor: -4 */
5596 8, /* Return address column */
5597 1, /* Augmentation size */
5598 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5599 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5600 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5601 DW_CFA_nop, DW_CFA_nop,
5602
5603 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5604 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5605 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5606 0, 0, 0, 0, /* .plt size goes here */
5607 0, /* Augmentation size */
5608 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5609 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5610 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5611 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5612 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5613 13, /* Block length */
5614 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5615 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5616 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5617 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5618 DW_CFA_nop, DW_CFA_nop
5619 };
5620
5621 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5622 {
5623 elf_i386_nacl_plt0_entry, /* plt0_entry */
5624 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5625 2, /* plt0_got1_offset */
5626 8, /* plt0_got2_offset */
5627 elf_i386_nacl_plt_entry, /* plt_entry */
5628 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5629 2, /* plt_got_offset */
5630 33, /* plt_reloc_offset */
5631 38, /* plt_plt_offset */
5632 32, /* plt_lazy_offset */
5633 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5634 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5635 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5636 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5637 };
5638
5639 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5640 {
5641 &elf_i386_nacl_plt, /* plt */
5642 0x90, /* plt0_pad_byte: nop insn */
5643 0, /* is_vxworks */
5644 };
5645
5646 static bfd_boolean
5647 elf32_i386_nacl_elf_object_p (bfd *abfd)
5648 {
5649 /* Set the right machine number for a NaCl i386 ELF32 file. */
5650 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5651 return TRUE;
5652 }
5653
5654 #undef elf_backend_arch_data
5655 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5656
5657 #undef elf_backend_object_p
5658 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5659 #undef elf_backend_modify_segment_map
5660 #define elf_backend_modify_segment_map nacl_modify_segment_map
5661 #undef elf_backend_modify_program_headers
5662 #define elf_backend_modify_program_headers nacl_modify_program_headers
5663 #undef elf_backend_final_write_processing
5664 #define elf_backend_final_write_processing nacl_final_write_processing
5665
5666 #include "elf32-target.h"
5667
5668 /* Restore defaults. */
5669 #undef elf_backend_object_p
5670 #undef elf_backend_modify_segment_map
5671 #undef elf_backend_modify_program_headers
5672 #undef elf_backend_final_write_processing
5673
5674 /* VxWorks support. */
5675
5676 #undef TARGET_LITTLE_SYM
5677 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5678 #undef TARGET_LITTLE_NAME
5679 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5680 #undef ELF_OSABI
5681 #undef elf_backend_plt_alignment
5682 #define elf_backend_plt_alignment 4
5683
5684 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5685 {
5686 &elf_i386_plt, /* plt */
5687 0x90, /* plt0_pad_byte */
5688 1, /* is_vxworks */
5689 };
5690
5691 #undef elf_backend_arch_data
5692 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5693
5694 #undef elf_backend_relocs_compatible
5695 #undef elf_backend_add_symbol_hook
5696 #define elf_backend_add_symbol_hook \
5697 elf_vxworks_add_symbol_hook
5698 #undef elf_backend_link_output_symbol_hook
5699 #define elf_backend_link_output_symbol_hook \
5700 elf_vxworks_link_output_symbol_hook
5701 #undef elf_backend_emit_relocs
5702 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5703 #undef elf_backend_final_write_processing
5704 #define elf_backend_final_write_processing \
5705 elf_vxworks_final_write_processing
5706 #undef elf_backend_static_tls_alignment
5707
5708 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5709 define it. */
5710 #undef elf_backend_want_plt_sym
5711 #define elf_backend_want_plt_sym 1
5712
5713 #undef elf32_bed
5714 #define elf32_bed elf32_i386_vxworks_bed
5715
5716 #include "elf32-target.h"
GDB Binutils - Deliverables
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