x86/Linux: disable all-stop on top of non-stop
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32
33 /* 386 uses REL relocations instead of RELA. */
34 #define USE_REL 1
35
36 #include "elf/i386.h"
37
38 static reloc_howto_type elf_howto_table[]=
39 {
40 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
73
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
112
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
135 bfd_elf_generic_reloc, "R_386_SIZE32",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_VTABLE_INHERIT:
336 TRACE ("BFD_RELOC_VTABLE_INHERIT");
337 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
338
339 case BFD_RELOC_VTABLE_ENTRY:
340 TRACE ("BFD_RELOC_VTABLE_ENTRY");
341 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
342
343 default:
344 break;
345 }
346
347 TRACE ("Unknown");
348 return 0;
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_irelative - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
376 >= R_386_vt - R_386_irelative))
377 {
378 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
379 abfd, (int) r_type);
380 indx = R_386_NONE;
381 }
382 /* PR 17512: file: 0f67f69d. */
383 if (elf_howto_table [indx].type != r_type)
384 return NULL;
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* Entries in the GOT procedure linkage table look like this. */
586
587 static const bfd_byte elf_i386_got_plt_entry[8] =
588 {
589 0xff, 0x25, /* jmp indirect */
590 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
591 0x66, 0x90 /* xchg %ax,%ax */
592 };
593
594 /* Entries in the PIC GOT procedure linkage table look like this. */
595
596 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
597 {
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* .eh_frame covering the .plt section. */
604
605 static const bfd_byte elf_i386_eh_frame_plt[] =
606 {
607 #define PLT_CIE_LENGTH 20
608 #define PLT_FDE_LENGTH 36
609 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
610 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
611 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
612 0, 0, 0, 0, /* CIE ID */
613 1, /* CIE version */
614 'z', 'R', 0, /* Augmentation string */
615 1, /* Code alignment factor */
616 0x7c, /* Data alignment factor */
617 8, /* Return address column */
618 1, /* Augmentation size */
619 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
620 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
621 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
622 DW_CFA_nop, DW_CFA_nop,
623
624 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
625 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
626 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
627 0, 0, 0, 0, /* .plt size goes here */
628 0, /* Augmentation size */
629 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
630 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
631 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
632 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
633 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
634 11, /* Block length */
635 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
636 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
637 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
638 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
639 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
640 };
641
642 struct elf_i386_plt_layout
643 {
644 /* The first entry in an absolute procedure linkage table looks like this. */
645 const bfd_byte *plt0_entry;
646 unsigned int plt0_entry_size;
647
648 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
649 unsigned int plt0_got1_offset;
650 unsigned int plt0_got2_offset;
651
652 /* Later entries in an absolute procedure linkage table look like this. */
653 const bfd_byte *plt_entry;
654 unsigned int plt_entry_size;
655
656 /* Offsets into plt_entry that are to be replaced with... */
657 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
658 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
659 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
660
661 /* Offset into plt_entry where the initial value of the GOT entry points. */
662 unsigned int plt_lazy_offset;
663
664 /* The first entry in a PIC procedure linkage table looks like this. */
665 const bfd_byte *pic_plt0_entry;
666
667 /* Subsequent entries in a PIC procedure linkage table look like this. */
668 const bfd_byte *pic_plt_entry;
669
670 /* .eh_frame covering the .plt section. */
671 const bfd_byte *eh_frame_plt;
672 unsigned int eh_frame_plt_size;
673 };
674
675 #define GET_PLT_ENTRY_SIZE(abfd) \
676 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
677
678 /* These are the standard parameters. */
679 static const struct elf_i386_plt_layout elf_i386_plt =
680 {
681 elf_i386_plt0_entry, /* plt0_entry */
682 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
683 2, /* plt0_got1_offset */
684 8, /* plt0_got2_offset */
685 elf_i386_plt_entry, /* plt_entry */
686 PLT_ENTRY_SIZE, /* plt_entry_size */
687 2, /* plt_got_offset */
688 7, /* plt_reloc_offset */
689 12, /* plt_plt_offset */
690 6, /* plt_lazy_offset */
691 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
692 elf_i386_pic_plt_entry, /* pic_plt_entry */
693 elf_i386_eh_frame_plt, /* eh_frame_plt */
694 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
695 };
696 \f
697
698 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
699 for the PLTResolve stub and then for each PLT entry. */
700 #define PLTRESOLVE_RELOCS_SHLIB 0
701 #define PLTRESOLVE_RELOCS 2
702 #define PLT_NON_JUMP_SLOT_RELOCS 2
703
704 /* Architecture-specific backend data for i386. */
705
706 struct elf_i386_backend_data
707 {
708 /* Parameters describing PLT generation. */
709 const struct elf_i386_plt_layout *plt;
710
711 /* Value used to fill the unused bytes of the first PLT entry. */
712 bfd_byte plt0_pad_byte;
713
714 /* True if the target system is VxWorks. */
715 int is_vxworks;
716 };
717
718 #define get_elf_i386_backend_data(abfd) \
719 ((const struct elf_i386_backend_data *) \
720 get_elf_backend_data (abfd)->arch_data)
721
722 /* These are the standard parameters. */
723 static const struct elf_i386_backend_data elf_i386_arch_bed =
724 {
725 &elf_i386_plt, /* plt */
726 0, /* plt0_pad_byte */
727 0, /* is_vxworks */
728 };
729
730 #define elf_backend_arch_data &elf_i386_arch_bed
731
732 /* i386 ELF linker hash entry. */
733
734 struct elf_i386_link_hash_entry
735 {
736 struct elf_link_hash_entry elf;
737
738 /* Track dynamic relocs copied for this symbol. */
739 struct elf_dyn_relocs *dyn_relocs;
740
741 #define GOT_UNKNOWN 0
742 #define GOT_NORMAL 1
743 #define GOT_TLS_GD 2
744 #define GOT_TLS_IE 4
745 #define GOT_TLS_IE_POS 5
746 #define GOT_TLS_IE_NEG 6
747 #define GOT_TLS_IE_BOTH 7
748 #define GOT_TLS_GDESC 8
749 #define GOT_TLS_GD_BOTH_P(type) \
750 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
751 #define GOT_TLS_GD_P(type) \
752 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
753 #define GOT_TLS_GDESC_P(type) \
754 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
755 #define GOT_TLS_GD_ANY_P(type) \
756 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
757 unsigned char tls_type;
758
759 /* Symbol is referenced by R_386_GOTOFF relocation. */
760 unsigned int gotoff_ref : 1;
761
762 /* Information about the GOT PLT entry. Filled when there are both
763 GOT and PLT relocations against the same function. */
764 union gotplt_union plt_got;
765
766 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
767 starting at the end of the jump table. */
768 bfd_vma tlsdesc_got;
769 };
770
771 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
772
773 struct elf_i386_obj_tdata
774 {
775 struct elf_obj_tdata root;
776
777 /* tls_type for each local got entry. */
778 char *local_got_tls_type;
779
780 /* GOTPLT entries for TLS descriptors. */
781 bfd_vma *local_tlsdesc_gotent;
782 };
783
784 #define elf_i386_tdata(abfd) \
785 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
786
787 #define elf_i386_local_got_tls_type(abfd) \
788 (elf_i386_tdata (abfd)->local_got_tls_type)
789
790 #define elf_i386_local_tlsdesc_gotent(abfd) \
791 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
792
793 #define is_i386_elf(bfd) \
794 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
795 && elf_tdata (bfd) != NULL \
796 && elf_object_id (bfd) == I386_ELF_DATA)
797
798 static bfd_boolean
799 elf_i386_mkobject (bfd *abfd)
800 {
801 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
802 I386_ELF_DATA);
803 }
804
805 /* i386 ELF linker hash table. */
806
807 struct elf_i386_link_hash_table
808 {
809 struct elf_link_hash_table elf;
810
811 /* Short-cuts to get to dynamic linker sections. */
812 asection *sdynbss;
813 asection *srelbss;
814 asection *plt_eh_frame;
815 asection *plt_got;
816
817 union
818 {
819 bfd_signed_vma refcount;
820 bfd_vma offset;
821 } tls_ldm_got;
822
823 /* The amount of space used by the reserved portion of the sgotplt
824 section, plus whatever space is used by the jump slots. */
825 bfd_vma sgotplt_jump_table_size;
826
827 /* Small local sym cache. */
828 struct sym_cache sym_cache;
829
830 /* _TLS_MODULE_BASE_ symbol. */
831 struct bfd_link_hash_entry *tls_module_base;
832
833 /* Used by local STT_GNU_IFUNC symbols. */
834 htab_t loc_hash_table;
835 void * loc_hash_memory;
836
837 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
838 asection *srelplt2;
839
840 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
841 bfd_vma next_tls_desc_index;
842
843 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
844 bfd_vma next_jump_slot_index;
845
846 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
847 bfd_vma next_irelative_index;
848 };
849
850 /* Get the i386 ELF linker hash table from a link_info structure. */
851
852 #define elf_i386_hash_table(p) \
853 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
854 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
855
856 #define elf_i386_compute_jump_table_size(htab) \
857 ((htab)->elf.srelplt->reloc_count * 4)
858
859 /* Create an entry in an i386 ELF linker hash table. */
860
861 static struct bfd_hash_entry *
862 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
863 struct bfd_hash_table *table,
864 const char *string)
865 {
866 /* Allocate the structure if it has not already been allocated by a
867 subclass. */
868 if (entry == NULL)
869 {
870 entry = (struct bfd_hash_entry *)
871 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
872 if (entry == NULL)
873 return entry;
874 }
875
876 /* Call the allocation method of the superclass. */
877 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
878 if (entry != NULL)
879 {
880 struct elf_i386_link_hash_entry *eh;
881
882 eh = (struct elf_i386_link_hash_entry *) entry;
883 eh->dyn_relocs = NULL;
884 eh->tls_type = GOT_UNKNOWN;
885 eh->gotoff_ref = 0;
886 eh->plt_got.offset = (bfd_vma) -1;
887 eh->tlsdesc_got = (bfd_vma) -1;
888 }
889
890 return entry;
891 }
892
893 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
894 for local symbol so that we can handle local STT_GNU_IFUNC symbols
895 as global symbol. We reuse indx and dynstr_index for local symbol
896 hash since they aren't used by global symbols in this backend. */
897
898 static hashval_t
899 elf_i386_local_htab_hash (const void *ptr)
900 {
901 struct elf_link_hash_entry *h
902 = (struct elf_link_hash_entry *) ptr;
903 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
904 }
905
906 /* Compare local hash entries. */
907
908 static int
909 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
910 {
911 struct elf_link_hash_entry *h1
912 = (struct elf_link_hash_entry *) ptr1;
913 struct elf_link_hash_entry *h2
914 = (struct elf_link_hash_entry *) ptr2;
915
916 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
917 }
918
919 /* Find and/or create a hash entry for local symbol. */
920
921 static struct elf_link_hash_entry *
922 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
923 bfd *abfd, const Elf_Internal_Rela *rel,
924 bfd_boolean create)
925 {
926 struct elf_i386_link_hash_entry e, *ret;
927 asection *sec = abfd->sections;
928 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
929 ELF32_R_SYM (rel->r_info));
930 void **slot;
931
932 e.elf.indx = sec->id;
933 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
934 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
935 create ? INSERT : NO_INSERT);
936
937 if (!slot)
938 return NULL;
939
940 if (*slot)
941 {
942 ret = (struct elf_i386_link_hash_entry *) *slot;
943 return &ret->elf;
944 }
945
946 ret = (struct elf_i386_link_hash_entry *)
947 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
948 sizeof (struct elf_i386_link_hash_entry));
949 if (ret)
950 {
951 memset (ret, 0, sizeof (*ret));
952 ret->elf.indx = sec->id;
953 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
954 ret->elf.dynindx = -1;
955 ret->plt_got.offset = (bfd_vma) -1;
956 *slot = ret;
957 }
958 return &ret->elf;
959 }
960
961 /* Destroy an i386 ELF linker hash table. */
962
963 static void
964 elf_i386_link_hash_table_free (bfd *obfd)
965 {
966 struct elf_i386_link_hash_table *htab
967 = (struct elf_i386_link_hash_table *) obfd->link.hash;
968
969 if (htab->loc_hash_table)
970 htab_delete (htab->loc_hash_table);
971 if (htab->loc_hash_memory)
972 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
973 _bfd_elf_link_hash_table_free (obfd);
974 }
975
976 /* Create an i386 ELF linker hash table. */
977
978 static struct bfd_link_hash_table *
979 elf_i386_link_hash_table_create (bfd *abfd)
980 {
981 struct elf_i386_link_hash_table *ret;
982 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
983
984 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
985 if (ret == NULL)
986 return NULL;
987
988 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
989 elf_i386_link_hash_newfunc,
990 sizeof (struct elf_i386_link_hash_entry),
991 I386_ELF_DATA))
992 {
993 free (ret);
994 return NULL;
995 }
996
997 ret->loc_hash_table = htab_try_create (1024,
998 elf_i386_local_htab_hash,
999 elf_i386_local_htab_eq,
1000 NULL);
1001 ret->loc_hash_memory = objalloc_create ();
1002 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1003 {
1004 elf_i386_link_hash_table_free (abfd);
1005 return NULL;
1006 }
1007 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1008
1009 return &ret->elf.root;
1010 }
1011
1012 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1013 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1014 hash table. */
1015
1016 static bfd_boolean
1017 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1018 {
1019 struct elf_i386_link_hash_table *htab;
1020
1021 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1022 return FALSE;
1023
1024 htab = elf_i386_hash_table (info);
1025 if (htab == NULL)
1026 return FALSE;
1027
1028 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1029 if (!htab->sdynbss)
1030 abort ();
1031
1032 if (info->executable)
1033 {
1034 /* Always allow copy relocs for building executables. */
1035 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1036 if (s == NULL)
1037 {
1038 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1039 s = bfd_make_section_anyway_with_flags (dynobj,
1040 ".rel.bss",
1041 (bed->dynamic_sec_flags
1042 | SEC_READONLY));
1043 if (s == NULL
1044 || ! bfd_set_section_alignment (dynobj, s,
1045 bed->s->log_file_align))
1046 return FALSE;
1047 }
1048 htab->srelbss = s;
1049 }
1050
1051 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1052 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1053 &htab->srelplt2))
1054 return FALSE;
1055
1056 if (!info->no_ld_generated_unwind_info
1057 && htab->plt_eh_frame == NULL
1058 && htab->elf.splt != NULL)
1059 {
1060 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1061 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED);
1063 htab->plt_eh_frame
1064 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1065 if (htab->plt_eh_frame == NULL
1066 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1067 return FALSE;
1068 }
1069
1070 return TRUE;
1071 }
1072
1073 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1074
1075 static void
1076 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1077 struct elf_link_hash_entry *dir,
1078 struct elf_link_hash_entry *ind)
1079 {
1080 struct elf_i386_link_hash_entry *edir, *eind;
1081
1082 edir = (struct elf_i386_link_hash_entry *) dir;
1083 eind = (struct elf_i386_link_hash_entry *) ind;
1084
1085 if (eind->dyn_relocs != NULL)
1086 {
1087 if (edir->dyn_relocs != NULL)
1088 {
1089 struct elf_dyn_relocs **pp;
1090 struct elf_dyn_relocs *p;
1091
1092 /* Add reloc counts against the indirect sym to the direct sym
1093 list. Merge any entries against the same section. */
1094 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1095 {
1096 struct elf_dyn_relocs *q;
1097
1098 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1099 if (q->sec == p->sec)
1100 {
1101 q->pc_count += p->pc_count;
1102 q->count += p->count;
1103 *pp = p->next;
1104 break;
1105 }
1106 if (q == NULL)
1107 pp = &p->next;
1108 }
1109 *pp = edir->dyn_relocs;
1110 }
1111
1112 edir->dyn_relocs = eind->dyn_relocs;
1113 eind->dyn_relocs = NULL;
1114 }
1115
1116 if (ind->root.type == bfd_link_hash_indirect
1117 && dir->got.refcount <= 0)
1118 {
1119 edir->tls_type = eind->tls_type;
1120 eind->tls_type = GOT_UNKNOWN;
1121 }
1122
1123 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1124 generate a R_386_COPY reloc. */
1125 edir->gotoff_ref |= eind->gotoff_ref;
1126
1127 if (ELIMINATE_COPY_RELOCS
1128 && ind->root.type != bfd_link_hash_indirect
1129 && dir->dynamic_adjusted)
1130 {
1131 /* If called to transfer flags for a weakdef during processing
1132 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1133 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1134 dir->ref_dynamic |= ind->ref_dynamic;
1135 dir->ref_regular |= ind->ref_regular;
1136 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1137 dir->needs_plt |= ind->needs_plt;
1138 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1139 }
1140 else
1141 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1142 }
1143
1144 /* Return TRUE if the TLS access code sequence support transition
1145 from R_TYPE. */
1146
1147 static bfd_boolean
1148 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1149 bfd_byte *contents,
1150 Elf_Internal_Shdr *symtab_hdr,
1151 struct elf_link_hash_entry **sym_hashes,
1152 unsigned int r_type,
1153 const Elf_Internal_Rela *rel,
1154 const Elf_Internal_Rela *relend)
1155 {
1156 unsigned int val, type;
1157 unsigned long r_symndx;
1158 struct elf_link_hash_entry *h;
1159 bfd_vma offset;
1160
1161 /* Get the section contents. */
1162 if (contents == NULL)
1163 {
1164 if (elf_section_data (sec)->this_hdr.contents != NULL)
1165 contents = elf_section_data (sec)->this_hdr.contents;
1166 else
1167 {
1168 /* FIXME: How to better handle error condition? */
1169 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1170 return FALSE;
1171
1172 /* Cache the section contents for elf_link_input_bfd. */
1173 elf_section_data (sec)->this_hdr.contents = contents;
1174 }
1175 }
1176
1177 offset = rel->r_offset;
1178 switch (r_type)
1179 {
1180 case R_386_TLS_GD:
1181 case R_386_TLS_LDM:
1182 if (offset < 2 || (rel + 1) >= relend)
1183 return FALSE;
1184
1185 type = bfd_get_8 (abfd, contents + offset - 2);
1186 if (r_type == R_386_TLS_GD)
1187 {
1188 /* Check transition from GD access model. Only
1189 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1190 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1191 can transit to different access model. */
1192 if ((offset + 10) > sec->size ||
1193 (type != 0x8d && type != 0x04))
1194 return FALSE;
1195
1196 val = bfd_get_8 (abfd, contents + offset - 1);
1197 if (type == 0x04)
1198 {
1199 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1200 if (offset < 3)
1201 return FALSE;
1202
1203 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1204 return FALSE;
1205
1206 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1207 return FALSE;
1208 }
1209 else
1210 {
1211 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1212 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1213 return FALSE;
1214
1215 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1216 return FALSE;
1217 }
1218 }
1219 else
1220 {
1221 /* Check transition from LD access model. Only
1222 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1223 can transit to different access model. */
1224 if (type != 0x8d || (offset + 9) > sec->size)
1225 return FALSE;
1226
1227 val = bfd_get_8 (abfd, contents + offset - 1);
1228 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1229 return FALSE;
1230 }
1231
1232 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1233 return FALSE;
1234
1235 r_symndx = ELF32_R_SYM (rel[1].r_info);
1236 if (r_symndx < symtab_hdr->sh_info)
1237 return FALSE;
1238
1239 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1240 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1241 may be versioned. */
1242 return (h != NULL
1243 && h->root.root.string != NULL
1244 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1245 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1246 && (strncmp (h->root.root.string, "___tls_get_addr",
1247 15) == 0));
1248
1249 case R_386_TLS_IE:
1250 /* Check transition from IE access model:
1251 movl foo@indntpoff(%rip), %eax
1252 movl foo@indntpoff(%rip), %reg
1253 addl foo@indntpoff(%rip), %reg
1254 */
1255
1256 if (offset < 1 || (offset + 4) > sec->size)
1257 return FALSE;
1258
1259 /* Check "movl foo@tpoff(%rip), %eax" first. */
1260 val = bfd_get_8 (abfd, contents + offset - 1);
1261 if (val == 0xa1)
1262 return TRUE;
1263
1264 if (offset < 2)
1265 return FALSE;
1266
1267 /* Check movl|addl foo@tpoff(%rip), %reg. */
1268 type = bfd_get_8 (abfd, contents + offset - 2);
1269 return ((type == 0x8b || type == 0x03)
1270 && (val & 0xc7) == 0x05);
1271
1272 case R_386_TLS_GOTIE:
1273 case R_386_TLS_IE_32:
1274 /* Check transition from {IE_32,GOTIE} access model:
1275 subl foo@{tpoff,gontoff}(%reg1), %reg2
1276 movl foo@{tpoff,gontoff}(%reg1), %reg2
1277 addl foo@{tpoff,gontoff}(%reg1), %reg2
1278 */
1279
1280 if (offset < 2 || (offset + 4) > sec->size)
1281 return FALSE;
1282
1283 val = bfd_get_8 (abfd, contents + offset - 1);
1284 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1285 return FALSE;
1286
1287 type = bfd_get_8 (abfd, contents + offset - 2);
1288 return type == 0x8b || type == 0x2b || type == 0x03;
1289
1290 case R_386_TLS_GOTDESC:
1291 /* Check transition from GDesc access model:
1292 leal x@tlsdesc(%ebx), %eax
1293
1294 Make sure it's a leal adding ebx to a 32-bit offset
1295 into any register, although it's probably almost always
1296 going to be eax. */
1297
1298 if (offset < 2 || (offset + 4) > sec->size)
1299 return FALSE;
1300
1301 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1302 return FALSE;
1303
1304 val = bfd_get_8 (abfd, contents + offset - 1);
1305 return (val & 0xc7) == 0x83;
1306
1307 case R_386_TLS_DESC_CALL:
1308 /* Check transition from GDesc access model:
1309 call *x@tlsdesc(%rax)
1310 */
1311 if (offset + 2 <= sec->size)
1312 {
1313 /* Make sure that it's a call *x@tlsdesc(%rax). */
1314 static const unsigned char call[] = { 0xff, 0x10 };
1315 return memcmp (contents + offset, call, 2) == 0;
1316 }
1317
1318 return FALSE;
1319
1320 default:
1321 abort ();
1322 }
1323 }
1324
1325 /* Return TRUE if the TLS access transition is OK or no transition
1326 will be performed. Update R_TYPE if there is a transition. */
1327
1328 static bfd_boolean
1329 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1330 asection *sec, bfd_byte *contents,
1331 Elf_Internal_Shdr *symtab_hdr,
1332 struct elf_link_hash_entry **sym_hashes,
1333 unsigned int *r_type, int tls_type,
1334 const Elf_Internal_Rela *rel,
1335 const Elf_Internal_Rela *relend,
1336 struct elf_link_hash_entry *h,
1337 unsigned long r_symndx)
1338 {
1339 unsigned int from_type = *r_type;
1340 unsigned int to_type = from_type;
1341 bfd_boolean check = TRUE;
1342
1343 /* Skip TLS transition for functions. */
1344 if (h != NULL
1345 && (h->type == STT_FUNC
1346 || h->type == STT_GNU_IFUNC))
1347 return TRUE;
1348
1349 switch (from_type)
1350 {
1351 case R_386_TLS_GD:
1352 case R_386_TLS_GOTDESC:
1353 case R_386_TLS_DESC_CALL:
1354 case R_386_TLS_IE_32:
1355 case R_386_TLS_IE:
1356 case R_386_TLS_GOTIE:
1357 if (info->executable)
1358 {
1359 if (h == NULL)
1360 to_type = R_386_TLS_LE_32;
1361 else if (from_type != R_386_TLS_IE
1362 && from_type != R_386_TLS_GOTIE)
1363 to_type = R_386_TLS_IE_32;
1364 }
1365
1366 /* When we are called from elf_i386_relocate_section, CONTENTS
1367 isn't NULL and there may be additional transitions based on
1368 TLS_TYPE. */
1369 if (contents != NULL)
1370 {
1371 unsigned int new_to_type = to_type;
1372
1373 if (info->executable
1374 && h != NULL
1375 && h->dynindx == -1
1376 && (tls_type & GOT_TLS_IE))
1377 new_to_type = R_386_TLS_LE_32;
1378
1379 if (to_type == R_386_TLS_GD
1380 || to_type == R_386_TLS_GOTDESC
1381 || to_type == R_386_TLS_DESC_CALL)
1382 {
1383 if (tls_type == GOT_TLS_IE_POS)
1384 new_to_type = R_386_TLS_GOTIE;
1385 else if (tls_type & GOT_TLS_IE)
1386 new_to_type = R_386_TLS_IE_32;
1387 }
1388
1389 /* We checked the transition before when we were called from
1390 elf_i386_check_relocs. We only want to check the new
1391 transition which hasn't been checked before. */
1392 check = new_to_type != to_type && from_type == to_type;
1393 to_type = new_to_type;
1394 }
1395
1396 break;
1397
1398 case R_386_TLS_LDM:
1399 if (info->executable)
1400 to_type = R_386_TLS_LE_32;
1401 break;
1402
1403 default:
1404 return TRUE;
1405 }
1406
1407 /* Return TRUE if there is no transition. */
1408 if (from_type == to_type)
1409 return TRUE;
1410
1411 /* Check if the transition can be performed. */
1412 if (check
1413 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1414 symtab_hdr, sym_hashes,
1415 from_type, rel, relend))
1416 {
1417 reloc_howto_type *from, *to;
1418 const char *name;
1419
1420 from = elf_i386_rtype_to_howto (abfd, from_type);
1421 to = elf_i386_rtype_to_howto (abfd, to_type);
1422
1423 if (h)
1424 name = h->root.root.string;
1425 else
1426 {
1427 struct elf_i386_link_hash_table *htab;
1428
1429 htab = elf_i386_hash_table (info);
1430 if (htab == NULL)
1431 name = "*unknown*";
1432 else
1433 {
1434 Elf_Internal_Sym *isym;
1435
1436 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1437 abfd, r_symndx);
1438 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1439 }
1440 }
1441
1442 (*_bfd_error_handler)
1443 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1444 "in section `%A' failed"),
1445 abfd, sec, from->name, to->name, name,
1446 (unsigned long) rel->r_offset);
1447 bfd_set_error (bfd_error_bad_value);
1448 return FALSE;
1449 }
1450
1451 *r_type = to_type;
1452 return TRUE;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define need_convert_mov_to_lea sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bfd_boolean
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_i386_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_boolean use_plt_got;
1476
1477 if (info->relocatable)
1478 return TRUE;
1479
1480 BFD_ASSERT (is_i386_elf (abfd));
1481
1482 htab = elf_i386_hash_table (info);
1483 if (htab == NULL)
1484 return FALSE;
1485
1486 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1487 && (get_elf_i386_backend_data (abfd)
1488 == &elf_i386_arch_bed));
1489
1490 symtab_hdr = &elf_symtab_hdr (abfd);
1491 sym_hashes = elf_sym_hashes (abfd);
1492
1493 sreloc = NULL;
1494
1495 rel_end = relocs + sec->reloc_count;
1496 for (rel = relocs; rel < rel_end; rel++)
1497 {
1498 unsigned int r_type;
1499 unsigned long r_symndx;
1500 struct elf_link_hash_entry *h;
1501 struct elf_i386_link_hash_entry *eh;
1502 Elf_Internal_Sym *isym;
1503 const char *name;
1504 bfd_boolean size_reloc;
1505
1506 r_symndx = ELF32_R_SYM (rel->r_info);
1507 r_type = ELF32_R_TYPE (rel->r_info);
1508
1509 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1510 {
1511 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1512 abfd,
1513 r_symndx);
1514 return FALSE;
1515 }
1516
1517 if (r_symndx < symtab_hdr->sh_info)
1518 {
1519 /* A local symbol. */
1520 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1521 abfd, r_symndx);
1522 if (isym == NULL)
1523 return FALSE;
1524
1525 /* Check relocation against local STT_GNU_IFUNC symbol. */
1526 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1527 {
1528 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1529 if (h == NULL)
1530 return FALSE;
1531
1532 /* Fake a STT_GNU_IFUNC symbol. */
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_i386_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 /* Create the ifunc sections for static executables. If we
1555 never see an indirect function symbol nor we are building
1556 a static executable, those sections will be empty and
1557 won't appear in output. */
1558 switch (r_type)
1559 {
1560 default:
1561 break;
1562
1563 case R_386_GOTOFF:
1564 eh->gotoff_ref = 1;
1565 case R_386_32:
1566 case R_386_PC32:
1567 case R_386_PLT32:
1568 case R_386_GOT32:
1569 if (htab->elf.dynobj == NULL)
1570 htab->elf.dynobj = abfd;
1571 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1572 return FALSE;
1573 break;
1574 }
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 h->root.non_ir_ref = 1;
1579
1580 if (h->type == STT_GNU_IFUNC)
1581 elf_tdata (info->output_bfd)->has_gnu_symbols
1582 |= elf_gnu_symbol_ifunc;
1583 }
1584
1585 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1586 symtab_hdr, sym_hashes,
1587 &r_type, GOT_UNKNOWN,
1588 rel, rel_end, h, r_symndx))
1589 return FALSE;
1590
1591 switch (r_type)
1592 {
1593 case R_386_TLS_LDM:
1594 htab->tls_ldm_got.refcount += 1;
1595 goto create_got;
1596
1597 case R_386_PLT32:
1598 /* This symbol requires a procedure linkage table entry. We
1599 actually build the entry in adjust_dynamic_symbol,
1600 because this might be a case of linking PIC code which is
1601 never referenced by a dynamic object, in which case we
1602 don't need to generate a procedure linkage table entry
1603 after all. */
1604
1605 /* If this is a local symbol, we resolve it directly without
1606 creating a procedure linkage table entry. */
1607 if (h == NULL)
1608 continue;
1609
1610 h->needs_plt = 1;
1611 h->plt.refcount += 1;
1612 break;
1613
1614 case R_386_SIZE32:
1615 size_reloc = TRUE;
1616 goto do_size;
1617
1618 case R_386_TLS_IE_32:
1619 case R_386_TLS_IE:
1620 case R_386_TLS_GOTIE:
1621 if (!info->executable)
1622 info->flags |= DF_STATIC_TLS;
1623 /* Fall through */
1624
1625 case R_386_GOT32:
1626 case R_386_TLS_GD:
1627 case R_386_TLS_GOTDESC:
1628 case R_386_TLS_DESC_CALL:
1629 /* This symbol requires a global offset table entry. */
1630 {
1631 int tls_type, old_tls_type;
1632
1633 switch (r_type)
1634 {
1635 default:
1636 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1637 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 tls_type = GOT_TLS_GDESC; break;
1641 case R_386_TLS_IE_32:
1642 if (ELF32_R_TYPE (rel->r_info) == r_type)
1643 tls_type = GOT_TLS_IE_NEG;
1644 else
1645 /* If this is a GD->IE transition, we may use either of
1646 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1647 tls_type = GOT_TLS_IE;
1648 break;
1649 case R_386_TLS_IE:
1650 case R_386_TLS_GOTIE:
1651 tls_type = GOT_TLS_IE_POS; break;
1652 }
1653
1654 if (h != NULL)
1655 {
1656 h->got.refcount += 1;
1657 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1658 }
1659 else
1660 {
1661 bfd_signed_vma *local_got_refcounts;
1662
1663 /* This is a global offset table entry for a local symbol. */
1664 local_got_refcounts = elf_local_got_refcounts (abfd);
1665 if (local_got_refcounts == NULL)
1666 {
1667 bfd_size_type size;
1668
1669 size = symtab_hdr->sh_info;
1670 size *= (sizeof (bfd_signed_vma)
1671 + sizeof (bfd_vma) + sizeof(char));
1672 local_got_refcounts = (bfd_signed_vma *)
1673 bfd_zalloc (abfd, size);
1674 if (local_got_refcounts == NULL)
1675 return FALSE;
1676 elf_local_got_refcounts (abfd) = local_got_refcounts;
1677 elf_i386_local_tlsdesc_gotent (abfd)
1678 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1679 elf_i386_local_got_tls_type (abfd)
1680 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1681 }
1682 local_got_refcounts[r_symndx] += 1;
1683 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1684 }
1685
1686 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1687 tls_type |= old_tls_type;
1688 /* If a TLS symbol is accessed using IE at least once,
1689 there is no point to use dynamic model for it. */
1690 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1691 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1692 || (tls_type & GOT_TLS_IE) == 0))
1693 {
1694 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1695 tls_type = old_tls_type;
1696 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1697 && GOT_TLS_GD_ANY_P (tls_type))
1698 tls_type |= old_tls_type;
1699 else
1700 {
1701 if (h)
1702 name = h->root.root.string;
1703 else
1704 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1705 NULL);
1706 (*_bfd_error_handler)
1707 (_("%B: `%s' accessed both as normal and "
1708 "thread local symbol"),
1709 abfd, name);
1710 bfd_set_error (bfd_error_bad_value);
1711 return FALSE;
1712 }
1713 }
1714
1715 if (old_tls_type != tls_type)
1716 {
1717 if (h != NULL)
1718 elf_i386_hash_entry (h)->tls_type = tls_type;
1719 else
1720 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1721 }
1722 }
1723 /* Fall through */
1724
1725 case R_386_GOTOFF:
1726 case R_386_GOTPC:
1727 create_got:
1728 if (htab->elf.sgot == NULL)
1729 {
1730 if (htab->elf.dynobj == NULL)
1731 htab->elf.dynobj = abfd;
1732 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1733 return FALSE;
1734 }
1735 if (r_type != R_386_TLS_IE)
1736 break;
1737 /* Fall through */
1738
1739 case R_386_TLS_LE_32:
1740 case R_386_TLS_LE:
1741 if (info->executable)
1742 break;
1743 info->flags |= DF_STATIC_TLS;
1744 /* Fall through */
1745
1746 case R_386_32:
1747 case R_386_PC32:
1748 if (h != NULL && info->executable)
1749 {
1750 /* If this reloc is in a read-only section, we might
1751 need a copy reloc. We can't check reliably at this
1752 stage whether the section is read-only, as input
1753 sections have not yet been mapped to output sections.
1754 Tentatively set the flag for now, and correct in
1755 adjust_dynamic_symbol. */
1756 h->non_got_ref = 1;
1757
1758 /* We may need a .plt entry if the function this reloc
1759 refers to is in a shared lib. */
1760 h->plt.refcount += 1;
1761 if (r_type != R_386_PC32)
1762 h->pointer_equality_needed = 1;
1763 }
1764
1765 size_reloc = FALSE;
1766 do_size:
1767 /* If we are creating a shared library, and this is a reloc
1768 against a global symbol, or a non PC relative reloc
1769 against a local symbol, then we need to copy the reloc
1770 into the shared library. However, if we are linking with
1771 -Bsymbolic, we do not need to copy a reloc against a
1772 global symbol which is defined in an object we are
1773 including in the link (i.e., DEF_REGULAR is set). At
1774 this point we have not seen all the input files, so it is
1775 possible that DEF_REGULAR is not set now but will be set
1776 later (it is never cleared). In case of a weak definition,
1777 DEF_REGULAR may be cleared later by a strong definition in
1778 a shared library. We account for that possibility below by
1779 storing information in the relocs_copied field of the hash
1780 table entry. A similar situation occurs when creating
1781 shared libraries and symbol visibility changes render the
1782 symbol local.
1783
1784 If on the other hand, we are creating an executable, we
1785 may need to keep relocations for symbols satisfied by a
1786 dynamic library if we manage to avoid copy relocs for the
1787 symbol. */
1788 if ((info->shared
1789 && (sec->flags & SEC_ALLOC) != 0
1790 && (r_type != R_386_PC32
1791 || (h != NULL
1792 && (! SYMBOLIC_BIND (info, h)
1793 || h->root.type == bfd_link_hash_defweak
1794 || !h->def_regular))))
1795 || (ELIMINATE_COPY_RELOCS
1796 && !info->shared
1797 && (sec->flags & SEC_ALLOC) != 0
1798 && h != NULL
1799 && (h->root.type == bfd_link_hash_defweak
1800 || !h->def_regular)))
1801 {
1802 struct elf_dyn_relocs *p;
1803 struct elf_dyn_relocs **head;
1804
1805 /* We must copy these reloc types into the output file.
1806 Create a reloc section in dynobj and make room for
1807 this reloc. */
1808 if (sreloc == NULL)
1809 {
1810 if (htab->elf.dynobj == NULL)
1811 htab->elf.dynobj = abfd;
1812
1813 sreloc = _bfd_elf_make_dynamic_reloc_section
1814 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1815
1816 if (sreloc == NULL)
1817 return FALSE;
1818 }
1819
1820 /* If this is a global symbol, we count the number of
1821 relocations we need for this symbol. */
1822 if (h != NULL)
1823 {
1824 head = &eh->dyn_relocs;
1825 }
1826 else
1827 {
1828 /* Track dynamic relocs needed for local syms too.
1829 We really need local syms available to do this
1830 easily. Oh well. */
1831 void **vpp;
1832 asection *s;
1833
1834 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1835 abfd, r_symndx);
1836 if (isym == NULL)
1837 return FALSE;
1838
1839 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1840 if (s == NULL)
1841 s = sec;
1842
1843 vpp = &elf_section_data (s)->local_dynrel;
1844 head = (struct elf_dyn_relocs **)vpp;
1845 }
1846
1847 p = *head;
1848 if (p == NULL || p->sec != sec)
1849 {
1850 bfd_size_type amt = sizeof *p;
1851 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1852 amt);
1853 if (p == NULL)
1854 return FALSE;
1855 p->next = *head;
1856 *head = p;
1857 p->sec = sec;
1858 p->count = 0;
1859 p->pc_count = 0;
1860 }
1861
1862 p->count += 1;
1863 /* Count size relocation as PC-relative relocation. */
1864 if (r_type == R_386_PC32 || size_reloc)
1865 p->pc_count += 1;
1866 }
1867 break;
1868
1869 /* This relocation describes the C++ object vtable hierarchy.
1870 Reconstruct it for later use during GC. */
1871 case R_386_GNU_VTINHERIT:
1872 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1873 return FALSE;
1874 break;
1875
1876 /* This relocation describes which C++ vtable entries are actually
1877 used. Record for later use during GC. */
1878 case R_386_GNU_VTENTRY:
1879 BFD_ASSERT (h != NULL);
1880 if (h != NULL
1881 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1882 return FALSE;
1883 break;
1884
1885 default:
1886 break;
1887 }
1888
1889 if (use_plt_got
1890 && h != NULL
1891 && h->plt.refcount > 0
1892 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1893 || h->got.refcount > 0)
1894 && htab->plt_got == NULL)
1895 {
1896 /* Create the GOT procedure linkage table. */
1897 unsigned int plt_got_align;
1898 const struct elf_backend_data *bed;
1899
1900 bed = get_elf_backend_data (info->output_bfd);
1901 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1902 && (sizeof (elf_i386_got_plt_entry)
1903 == sizeof (elf_i386_pic_got_plt_entry)));
1904 plt_got_align = 3;
1905
1906 if (htab->elf.dynobj == NULL)
1907 htab->elf.dynobj = abfd;
1908 htab->plt_got
1909 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1910 ".plt.got",
1911 (bed->dynamic_sec_flags
1912 | SEC_ALLOC
1913 | SEC_CODE
1914 | SEC_LOAD
1915 | SEC_READONLY));
1916 if (htab->plt_got == NULL
1917 || !bfd_set_section_alignment (htab->elf.dynobj,
1918 htab->plt_got,
1919 plt_got_align))
1920 return FALSE;
1921 }
1922
1923 if (r_type == R_386_GOT32
1924 && (h == NULL || h->type != STT_GNU_IFUNC))
1925 sec->need_convert_mov_to_lea = 1;
1926 }
1927
1928 return TRUE;
1929 }
1930
1931 /* Return the section that should be marked against GC for a given
1932 relocation. */
1933
1934 static asection *
1935 elf_i386_gc_mark_hook (asection *sec,
1936 struct bfd_link_info *info,
1937 Elf_Internal_Rela *rel,
1938 struct elf_link_hash_entry *h,
1939 Elf_Internal_Sym *sym)
1940 {
1941 if (h != NULL)
1942 switch (ELF32_R_TYPE (rel->r_info))
1943 {
1944 case R_386_GNU_VTINHERIT:
1945 case R_386_GNU_VTENTRY:
1946 return NULL;
1947 }
1948
1949 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1950 }
1951
1952 /* Update the got entry reference counts for the section being removed. */
1953
1954 static bfd_boolean
1955 elf_i386_gc_sweep_hook (bfd *abfd,
1956 struct bfd_link_info *info,
1957 asection *sec,
1958 const Elf_Internal_Rela *relocs)
1959 {
1960 struct elf_i386_link_hash_table *htab;
1961 Elf_Internal_Shdr *symtab_hdr;
1962 struct elf_link_hash_entry **sym_hashes;
1963 bfd_signed_vma *local_got_refcounts;
1964 const Elf_Internal_Rela *rel, *relend;
1965
1966 if (info->relocatable)
1967 return TRUE;
1968
1969 htab = elf_i386_hash_table (info);
1970 if (htab == NULL)
1971 return FALSE;
1972
1973 elf_section_data (sec)->local_dynrel = NULL;
1974
1975 symtab_hdr = &elf_symtab_hdr (abfd);
1976 sym_hashes = elf_sym_hashes (abfd);
1977 local_got_refcounts = elf_local_got_refcounts (abfd);
1978
1979 relend = relocs + sec->reloc_count;
1980 for (rel = relocs; rel < relend; rel++)
1981 {
1982 unsigned long r_symndx;
1983 unsigned int r_type;
1984 struct elf_link_hash_entry *h = NULL;
1985
1986 r_symndx = ELF32_R_SYM (rel->r_info);
1987 if (r_symndx >= symtab_hdr->sh_info)
1988 {
1989 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1990 while (h->root.type == bfd_link_hash_indirect
1991 || h->root.type == bfd_link_hash_warning)
1992 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1993 }
1994 else
1995 {
1996 /* A local symbol. */
1997 Elf_Internal_Sym *isym;
1998
1999 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2000 abfd, r_symndx);
2001
2002 /* Check relocation against local STT_GNU_IFUNC symbol. */
2003 if (isym != NULL
2004 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2005 {
2006 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2007 if (h == NULL)
2008 abort ();
2009 }
2010 }
2011
2012 if (h)
2013 {
2014 struct elf_i386_link_hash_entry *eh;
2015 struct elf_dyn_relocs **pp;
2016 struct elf_dyn_relocs *p;
2017
2018 eh = (struct elf_i386_link_hash_entry *) h;
2019 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2020 if (p->sec == sec)
2021 {
2022 /* Everything must go for SEC. */
2023 *pp = p->next;
2024 break;
2025 }
2026 }
2027
2028 r_type = ELF32_R_TYPE (rel->r_info);
2029 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2030 symtab_hdr, sym_hashes,
2031 &r_type, GOT_UNKNOWN,
2032 rel, relend, h, r_symndx))
2033 return FALSE;
2034
2035 switch (r_type)
2036 {
2037 case R_386_TLS_LDM:
2038 if (htab->tls_ldm_got.refcount > 0)
2039 htab->tls_ldm_got.refcount -= 1;
2040 break;
2041
2042 case R_386_TLS_GD:
2043 case R_386_TLS_GOTDESC:
2044 case R_386_TLS_DESC_CALL:
2045 case R_386_TLS_IE_32:
2046 case R_386_TLS_IE:
2047 case R_386_TLS_GOTIE:
2048 case R_386_GOT32:
2049 if (h != NULL)
2050 {
2051 if (h->got.refcount > 0)
2052 h->got.refcount -= 1;
2053 if (h->type == STT_GNU_IFUNC)
2054 {
2055 if (h->plt.refcount > 0)
2056 h->plt.refcount -= 1;
2057 }
2058 }
2059 else if (local_got_refcounts != NULL)
2060 {
2061 if (local_got_refcounts[r_symndx] > 0)
2062 local_got_refcounts[r_symndx] -= 1;
2063 }
2064 break;
2065
2066 case R_386_32:
2067 case R_386_PC32:
2068 case R_386_SIZE32:
2069 if (info->shared
2070 && (h == NULL || h->type != STT_GNU_IFUNC))
2071 break;
2072 /* Fall through */
2073
2074 case R_386_PLT32:
2075 if (h != NULL)
2076 {
2077 if (h->plt.refcount > 0)
2078 h->plt.refcount -= 1;
2079 }
2080 break;
2081
2082 case R_386_GOTOFF:
2083 if (h != NULL && h->type == STT_GNU_IFUNC)
2084 {
2085 if (h->got.refcount > 0)
2086 h->got.refcount -= 1;
2087 if (h->plt.refcount > 0)
2088 h->plt.refcount -= 1;
2089 }
2090 break;
2091
2092 default:
2093 break;
2094 }
2095 }
2096
2097 return TRUE;
2098 }
2099
2100 /* Adjust a symbol defined by a dynamic object and referenced by a
2101 regular object. The current definition is in some section of the
2102 dynamic object, but we're not including those sections. We have to
2103 change the definition to something the rest of the link can
2104 understand. */
2105
2106 static bfd_boolean
2107 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2108 struct elf_link_hash_entry *h)
2109 {
2110 struct elf_i386_link_hash_table *htab;
2111 asection *s;
2112 struct elf_i386_link_hash_entry *eh;
2113 struct elf_dyn_relocs *p;
2114
2115 /* STT_GNU_IFUNC symbol must go through PLT. */
2116 if (h->type == STT_GNU_IFUNC)
2117 {
2118 /* All local STT_GNU_IFUNC references must be treate as local
2119 calls via local PLT. */
2120 if (h->ref_regular
2121 && SYMBOL_CALLS_LOCAL (info, h))
2122 {
2123 bfd_size_type pc_count = 0, count = 0;
2124 struct elf_dyn_relocs **pp;
2125
2126 eh = (struct elf_i386_link_hash_entry *) h;
2127 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2128 {
2129 pc_count += p->pc_count;
2130 p->count -= p->pc_count;
2131 p->pc_count = 0;
2132 count += p->count;
2133 if (p->count == 0)
2134 *pp = p->next;
2135 else
2136 pp = &p->next;
2137 }
2138
2139 if (pc_count || count)
2140 {
2141 h->needs_plt = 1;
2142 h->non_got_ref = 1;
2143 if (h->plt.refcount <= 0)
2144 h->plt.refcount = 1;
2145 else
2146 h->plt.refcount += 1;
2147 }
2148 }
2149
2150 if (h->plt.refcount <= 0)
2151 {
2152 h->plt.offset = (bfd_vma) -1;
2153 h->needs_plt = 0;
2154 }
2155 return TRUE;
2156 }
2157
2158 /* If this is a function, put it in the procedure linkage table. We
2159 will fill in the contents of the procedure linkage table later,
2160 when we know the address of the .got section. */
2161 if (h->type == STT_FUNC
2162 || h->needs_plt)
2163 {
2164 if (h->plt.refcount <= 0
2165 || SYMBOL_CALLS_LOCAL (info, h)
2166 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2167 && h->root.type == bfd_link_hash_undefweak))
2168 {
2169 /* This case can occur if we saw a PLT32 reloc in an input
2170 file, but the symbol was never referred to by a dynamic
2171 object, or if all references were garbage collected. In
2172 such a case, we don't actually need to build a procedure
2173 linkage table, and we can just do a PC32 reloc instead. */
2174 h->plt.offset = (bfd_vma) -1;
2175 h->needs_plt = 0;
2176 }
2177
2178 return TRUE;
2179 }
2180 else
2181 /* It's possible that we incorrectly decided a .plt reloc was
2182 needed for an R_386_PC32 reloc to a non-function sym in
2183 check_relocs. We can't decide accurately between function and
2184 non-function syms in check-relocs; Objects loaded later in
2185 the link may change h->type. So fix it now. */
2186 h->plt.offset = (bfd_vma) -1;
2187
2188 /* If this is a weak symbol, and there is a real definition, the
2189 processor independent code will have arranged for us to see the
2190 real definition first, and we can just use the same value. */
2191 if (h->u.weakdef != NULL)
2192 {
2193 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2194 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2195 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2196 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2197 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2198 h->non_got_ref = h->u.weakdef->non_got_ref;
2199 return TRUE;
2200 }
2201
2202 /* This is a reference to a symbol defined by a dynamic object which
2203 is not a function. */
2204
2205 /* If we are creating a shared library, we must presume that the
2206 only references to the symbol are via the global offset table.
2207 For such cases we need not do anything here; the relocations will
2208 be handled correctly by relocate_section. */
2209 if (!info->executable)
2210 return TRUE;
2211
2212 /* If there are no references to this symbol that do not use the
2213 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2214 reloc. */
2215 eh = (struct elf_i386_link_hash_entry *) h;
2216 if (!h->non_got_ref && !eh->gotoff_ref)
2217 return TRUE;
2218
2219 /* If -z nocopyreloc was given, we won't generate them either. */
2220 if (info->nocopyreloc)
2221 {
2222 h->non_got_ref = 0;
2223 return TRUE;
2224 }
2225
2226 htab = elf_i386_hash_table (info);
2227 if (htab == NULL)
2228 return FALSE;
2229
2230 /* If there aren't any dynamic relocs in read-only sections nor
2231 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2232 avoid the copy reloc. This doesn't work on VxWorks, where we can
2233 not have dynamic relocations (other than copy and jump slot
2234 relocations) in an executable. */
2235 if (ELIMINATE_COPY_RELOCS
2236 && !eh->gotoff_ref
2237 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2238 {
2239 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2240 {
2241 s = p->sec->output_section;
2242 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2243 break;
2244 }
2245
2246 if (p == NULL)
2247 {
2248 h->non_got_ref = 0;
2249 return TRUE;
2250 }
2251 }
2252
2253 /* We must allocate the symbol in our .dynbss section, which will
2254 become part of the .bss section of the executable. There will be
2255 an entry for this symbol in the .dynsym section. The dynamic
2256 object will contain position independent code, so all references
2257 from the dynamic object to this symbol will go through the global
2258 offset table. The dynamic linker will use the .dynsym entry to
2259 determine the address it must put in the global offset table, so
2260 both the dynamic object and the regular object will refer to the
2261 same memory location for the variable. */
2262
2263 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2264 copy the initial value out of the dynamic object and into the
2265 runtime process image. */
2266 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2267 {
2268 htab->srelbss->size += sizeof (Elf32_External_Rel);
2269 h->needs_copy = 1;
2270 }
2271
2272 s = htab->sdynbss;
2273
2274 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2275 }
2276
2277 /* Allocate space in .plt, .got and associated reloc sections for
2278 dynamic relocs. */
2279
2280 static bfd_boolean
2281 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2282 {
2283 struct bfd_link_info *info;
2284 struct elf_i386_link_hash_table *htab;
2285 struct elf_i386_link_hash_entry *eh;
2286 struct elf_dyn_relocs *p;
2287 unsigned plt_entry_size;
2288
2289 if (h->root.type == bfd_link_hash_indirect)
2290 return TRUE;
2291
2292 eh = (struct elf_i386_link_hash_entry *) h;
2293
2294 info = (struct bfd_link_info *) inf;
2295 htab = elf_i386_hash_table (info);
2296 if (htab == NULL)
2297 return FALSE;
2298
2299 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2300
2301 /* We can't use the GOT PLT if pointer equality is needed since
2302 finish_dynamic_symbol won't clear symbol value and the dynamic
2303 linker won't update the GOT slot. We will get into an infinite
2304 loop at run-time. */
2305 if (htab->plt_got != NULL
2306 && h->type != STT_GNU_IFUNC
2307 && !h->pointer_equality_needed
2308 && h->plt.refcount > 0
2309 && h->got.refcount > 0)
2310 {
2311 /* Don't use the regular PLT if there are both GOT and GOTPLT
2312 reloctions. */
2313 h->plt.offset = (bfd_vma) -1;
2314
2315 /* Use the GOT PLT. */
2316 eh->plt_got.refcount = 1;
2317 }
2318
2319 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2320 here if it is defined and referenced in a non-shared object. */
2321 if (h->type == STT_GNU_IFUNC
2322 && h->def_regular)
2323 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2324 plt_entry_size,
2325 plt_entry_size, 4);
2326 else if (htab->elf.dynamic_sections_created
2327 && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
2328 {
2329 bfd_boolean use_plt_got;
2330
2331 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2332 {
2333 /* Don't use the regular PLT for DF_BIND_NOW. */
2334 h->plt.offset = (bfd_vma) -1;
2335
2336 /* Use the GOT PLT. */
2337 h->got.refcount = 1;
2338 eh->plt_got.refcount = 1;
2339 }
2340
2341 use_plt_got = eh->plt_got.refcount > 0;
2342
2343 /* Make sure this symbol is output as a dynamic symbol.
2344 Undefined weak syms won't yet be marked as dynamic. */
2345 if (h->dynindx == -1
2346 && !h->forced_local)
2347 {
2348 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2349 return FALSE;
2350 }
2351
2352 if (info->shared
2353 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2354 {
2355 asection *s = htab->elf.splt;
2356 asection *got_s = htab->plt_got;
2357
2358 /* If this is the first .plt entry, make room for the special
2359 first entry. The .plt section is used by prelink to undo
2360 prelinking for dynamic relocations. */
2361 if (s->size == 0)
2362 s->size = plt_entry_size;
2363
2364 if (use_plt_got)
2365 eh->plt_got.offset = got_s->size;
2366 else
2367 h->plt.offset = s->size;
2368
2369 /* If this symbol is not defined in a regular file, and we are
2370 not generating a shared library, then set the symbol to this
2371 location in the .plt. This is required to make function
2372 pointers compare as equal between the normal executable and
2373 the shared library. */
2374 if (! info->shared
2375 && !h->def_regular)
2376 {
2377 if (use_plt_got)
2378 {
2379 /* We need to make a call to the entry of the GOT PLT
2380 instead of regular PLT entry. */
2381 h->root.u.def.section = got_s;
2382 h->root.u.def.value = eh->plt_got.offset;
2383 }
2384 else
2385 {
2386 h->root.u.def.section = s;
2387 h->root.u.def.value = h->plt.offset;
2388 }
2389 }
2390
2391 /* Make room for this entry. */
2392 if (use_plt_got)
2393 got_s->size += sizeof (elf_i386_got_plt_entry);
2394 else
2395 {
2396 s->size += plt_entry_size;
2397
2398 /* We also need to make an entry in the .got.plt section,
2399 which will be placed in the .got section by the linker
2400 script. */
2401 htab->elf.sgotplt->size += 4;
2402
2403 /* We also need to make an entry in the .rel.plt section. */
2404 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2405 htab->elf.srelplt->reloc_count++;
2406 }
2407
2408 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2409 && !info->shared)
2410 {
2411 /* VxWorks has a second set of relocations for each PLT entry
2412 in executables. They go in a separate relocation section,
2413 which is processed by the kernel loader. */
2414
2415 /* There are two relocations for the initial PLT entry: an
2416 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2417 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2418
2419 if (h->plt.offset == plt_entry_size)
2420 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2421
2422 /* There are two extra relocations for each subsequent PLT entry:
2423 an R_386_32 relocation for the GOT entry, and an R_386_32
2424 relocation for the PLT entry. */
2425
2426 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2427 }
2428 }
2429 else
2430 {
2431 h->plt.offset = (bfd_vma) -1;
2432 h->needs_plt = 0;
2433 }
2434 }
2435 else
2436 {
2437 h->plt.offset = (bfd_vma) -1;
2438 h->needs_plt = 0;
2439 }
2440
2441 eh->tlsdesc_got = (bfd_vma) -1;
2442
2443 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2444 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2445 if (h->got.refcount > 0
2446 && info->executable
2447 && h->dynindx == -1
2448 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2449 h->got.offset = (bfd_vma) -1;
2450 else if (h->got.refcount > 0)
2451 {
2452 asection *s;
2453 bfd_boolean dyn;
2454 int tls_type = elf_i386_hash_entry(h)->tls_type;
2455
2456 /* Make sure this symbol is output as a dynamic symbol.
2457 Undefined weak syms won't yet be marked as dynamic. */
2458 if (h->dynindx == -1
2459 && !h->forced_local)
2460 {
2461 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2462 return FALSE;
2463 }
2464
2465 s = htab->elf.sgot;
2466 if (GOT_TLS_GDESC_P (tls_type))
2467 {
2468 eh->tlsdesc_got = htab->elf.sgotplt->size
2469 - elf_i386_compute_jump_table_size (htab);
2470 htab->elf.sgotplt->size += 8;
2471 h->got.offset = (bfd_vma) -2;
2472 }
2473 if (! GOT_TLS_GDESC_P (tls_type)
2474 || GOT_TLS_GD_P (tls_type))
2475 {
2476 h->got.offset = s->size;
2477 s->size += 4;
2478 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2479 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2480 s->size += 4;
2481 }
2482 dyn = htab->elf.dynamic_sections_created;
2483 /* R_386_TLS_IE_32 needs one dynamic relocation,
2484 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2485 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2486 need two), R_386_TLS_GD needs one if local symbol and two if
2487 global. */
2488 if (tls_type == GOT_TLS_IE_BOTH)
2489 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2490 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2491 || (tls_type & GOT_TLS_IE))
2492 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2493 else if (GOT_TLS_GD_P (tls_type))
2494 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2495 else if (! GOT_TLS_GDESC_P (tls_type)
2496 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2497 || h->root.type != bfd_link_hash_undefweak)
2498 && (info->shared
2499 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2500 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2501 if (GOT_TLS_GDESC_P (tls_type))
2502 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2503 }
2504 else
2505 h->got.offset = (bfd_vma) -1;
2506
2507 if (eh->dyn_relocs == NULL)
2508 return TRUE;
2509
2510 /* In the shared -Bsymbolic case, discard space allocated for
2511 dynamic pc-relative relocs against symbols which turn out to be
2512 defined in regular objects. For the normal shared case, discard
2513 space for pc-relative relocs that have become local due to symbol
2514 visibility changes. */
2515
2516 if (info->shared)
2517 {
2518 /* The only reloc that uses pc_count is R_386_PC32, which will
2519 appear on a call or on something like ".long foo - .". We
2520 want calls to protected symbols to resolve directly to the
2521 function rather than going via the plt. If people want
2522 function pointer comparisons to work as expected then they
2523 should avoid writing assembly like ".long foo - .". */
2524 if (SYMBOL_CALLS_LOCAL (info, h))
2525 {
2526 struct elf_dyn_relocs **pp;
2527
2528 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2529 {
2530 p->count -= p->pc_count;
2531 p->pc_count = 0;
2532 if (p->count == 0)
2533 *pp = p->next;
2534 else
2535 pp = &p->next;
2536 }
2537 }
2538
2539 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2540 {
2541 struct elf_dyn_relocs **pp;
2542 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2543 {
2544 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2545 *pp = p->next;
2546 else
2547 pp = &p->next;
2548 }
2549 }
2550
2551 /* Also discard relocs on undefined weak syms with non-default
2552 visibility. */
2553 if (eh->dyn_relocs != NULL
2554 && h->root.type == bfd_link_hash_undefweak)
2555 {
2556 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2557 eh->dyn_relocs = NULL;
2558
2559 /* Make sure undefined weak symbols are output as a dynamic
2560 symbol in PIEs. */
2561 else if (h->dynindx == -1
2562 && !h->forced_local)
2563 {
2564 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2565 return FALSE;
2566 }
2567 }
2568 }
2569 else if (ELIMINATE_COPY_RELOCS)
2570 {
2571 /* For the non-shared case, discard space for relocs against
2572 symbols which turn out to need copy relocs or are not
2573 dynamic. */
2574
2575 if (!h->non_got_ref
2576 && ((h->def_dynamic
2577 && !h->def_regular)
2578 || (htab->elf.dynamic_sections_created
2579 && (h->root.type == bfd_link_hash_undefweak
2580 || h->root.type == bfd_link_hash_undefined))))
2581 {
2582 /* Make sure this symbol is output as a dynamic symbol.
2583 Undefined weak syms won't yet be marked as dynamic. */
2584 if (h->dynindx == -1
2585 && !h->forced_local)
2586 {
2587 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2588 return FALSE;
2589 }
2590
2591 /* If that succeeded, we know we'll be keeping all the
2592 relocs. */
2593 if (h->dynindx != -1)
2594 goto keep;
2595 }
2596
2597 eh->dyn_relocs = NULL;
2598
2599 keep: ;
2600 }
2601
2602 /* Finally, allocate space. */
2603 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2604 {
2605 asection *sreloc;
2606
2607 sreloc = elf_section_data (p->sec)->sreloc;
2608
2609 BFD_ASSERT (sreloc != NULL);
2610 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2611 }
2612
2613 return TRUE;
2614 }
2615
2616 /* Allocate space in .plt, .got and associated reloc sections for
2617 local dynamic relocs. */
2618
2619 static bfd_boolean
2620 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2621 {
2622 struct elf_link_hash_entry *h
2623 = (struct elf_link_hash_entry *) *slot;
2624
2625 if (h->type != STT_GNU_IFUNC
2626 || !h->def_regular
2627 || !h->ref_regular
2628 || !h->forced_local
2629 || h->root.type != bfd_link_hash_defined)
2630 abort ();
2631
2632 return elf_i386_allocate_dynrelocs (h, inf);
2633 }
2634
2635 /* Find any dynamic relocs that apply to read-only sections. */
2636
2637 static bfd_boolean
2638 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2639 {
2640 struct elf_i386_link_hash_entry *eh;
2641 struct elf_dyn_relocs *p;
2642
2643 /* Skip local IFUNC symbols. */
2644 if (h->forced_local && h->type == STT_GNU_IFUNC)
2645 return TRUE;
2646
2647 eh = (struct elf_i386_link_hash_entry *) h;
2648 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2649 {
2650 asection *s = p->sec->output_section;
2651
2652 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2653 {
2654 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2655
2656 info->flags |= DF_TEXTREL;
2657
2658 if ((info->warn_shared_textrel && info->shared)
2659 || info->error_textrel)
2660 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2661 p->sec->owner, h->root.root.string,
2662 p->sec);
2663
2664 /* Not an error, just cut short the traversal. */
2665 return FALSE;
2666 }
2667 }
2668 return TRUE;
2669 }
2670
2671 /* Convert
2672 mov foo@GOT(%reg), %reg
2673 to
2674 lea foo@GOTOFF(%reg), %reg
2675 with the local symbol, foo. */
2676
2677 static bfd_boolean
2678 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2679 struct bfd_link_info *link_info)
2680 {
2681 Elf_Internal_Shdr *symtab_hdr;
2682 Elf_Internal_Rela *internal_relocs;
2683 Elf_Internal_Rela *irel, *irelend;
2684 bfd_byte *contents;
2685 struct elf_i386_link_hash_table *htab;
2686 bfd_boolean changed_contents;
2687 bfd_boolean changed_relocs;
2688 bfd_signed_vma *local_got_refcounts;
2689
2690 /* Don't even try to convert non-ELF outputs. */
2691 if (!is_elf_hash_table (link_info->hash))
2692 return FALSE;
2693
2694 /* Nothing to do if there is no need or no output. */
2695 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2696 || sec->need_convert_mov_to_lea == 0
2697 || bfd_is_abs_section (sec->output_section))
2698 return TRUE;
2699
2700 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2701
2702 /* Load the relocations for this section. */
2703 internal_relocs = (_bfd_elf_link_read_relocs
2704 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2705 link_info->keep_memory));
2706 if (internal_relocs == NULL)
2707 return FALSE;
2708
2709 htab = elf_i386_hash_table (link_info);
2710 changed_contents = FALSE;
2711 changed_relocs = FALSE;
2712 local_got_refcounts = elf_local_got_refcounts (abfd);
2713
2714 /* Get the section contents. */
2715 if (elf_section_data (sec)->this_hdr.contents != NULL)
2716 contents = elf_section_data (sec)->this_hdr.contents;
2717 else
2718 {
2719 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2720 goto error_return;
2721 }
2722
2723 irelend = internal_relocs + sec->reloc_count;
2724 for (irel = internal_relocs; irel < irelend; irel++)
2725 {
2726 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2727 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2728 unsigned int indx;
2729 struct elf_link_hash_entry *h;
2730
2731 if (r_type != R_386_GOT32)
2732 continue;
2733
2734 /* Get the symbol referred to by the reloc. */
2735 if (r_symndx < symtab_hdr->sh_info)
2736 {
2737 Elf_Internal_Sym *isym;
2738
2739 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2740 abfd, r_symndx);
2741
2742 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2743 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2744 && irel->r_offset >= 2
2745 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2746 {
2747 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2748 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2749 if (local_got_refcounts != NULL
2750 && local_got_refcounts[r_symndx] > 0)
2751 local_got_refcounts[r_symndx] -= 1;
2752 changed_contents = TRUE;
2753 changed_relocs = TRUE;
2754 }
2755 continue;
2756 }
2757
2758 indx = r_symndx - symtab_hdr->sh_info;
2759 h = elf_sym_hashes (abfd)[indx];
2760 BFD_ASSERT (h != NULL);
2761
2762 while (h->root.type == bfd_link_hash_indirect
2763 || h->root.type == bfd_link_hash_warning)
2764 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2765
2766 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2767 optimizing _DYNAMIC since ld.so may use its link-time address. */
2768 if (h->def_regular
2769 && h->type != STT_GNU_IFUNC
2770 && h != htab->elf.hdynamic
2771 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2772 && irel->r_offset >= 2
2773 && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
2774 {
2775 bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
2776 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2777 if (h->got.refcount > 0)
2778 h->got.refcount -= 1;
2779 changed_contents = TRUE;
2780 changed_relocs = TRUE;
2781 }
2782 }
2783
2784 if (contents != NULL
2785 && elf_section_data (sec)->this_hdr.contents != contents)
2786 {
2787 if (!changed_contents && !link_info->keep_memory)
2788 free (contents);
2789 else
2790 {
2791 /* Cache the section contents for elf_link_input_bfd. */
2792 elf_section_data (sec)->this_hdr.contents = contents;
2793 }
2794 }
2795
2796 if (elf_section_data (sec)->relocs != internal_relocs)
2797 {
2798 if (!changed_relocs)
2799 free (internal_relocs);
2800 else
2801 elf_section_data (sec)->relocs = internal_relocs;
2802 }
2803
2804 return TRUE;
2805
2806 error_return:
2807 if (contents != NULL
2808 && elf_section_data (sec)->this_hdr.contents != contents)
2809 free (contents);
2810 if (internal_relocs != NULL
2811 && elf_section_data (sec)->relocs != internal_relocs)
2812 free (internal_relocs);
2813 return FALSE;
2814 }
2815
2816 /* Set the sizes of the dynamic sections. */
2817
2818 static bfd_boolean
2819 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2820 {
2821 struct elf_i386_link_hash_table *htab;
2822 bfd *dynobj;
2823 asection *s;
2824 bfd_boolean relocs;
2825 bfd *ibfd;
2826
2827 htab = elf_i386_hash_table (info);
2828 if (htab == NULL)
2829 return FALSE;
2830 dynobj = htab->elf.dynobj;
2831 if (dynobj == NULL)
2832 abort ();
2833
2834 if (htab->elf.dynamic_sections_created)
2835 {
2836 /* Set the contents of the .interp section to the interpreter. */
2837 if (info->executable)
2838 {
2839 s = bfd_get_linker_section (dynobj, ".interp");
2840 if (s == NULL)
2841 abort ();
2842 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2843 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2844 }
2845 }
2846
2847 /* Set up .got offsets for local syms, and space for local dynamic
2848 relocs. */
2849 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2850 {
2851 bfd_signed_vma *local_got;
2852 bfd_signed_vma *end_local_got;
2853 char *local_tls_type;
2854 bfd_vma *local_tlsdesc_gotent;
2855 bfd_size_type locsymcount;
2856 Elf_Internal_Shdr *symtab_hdr;
2857 asection *srel;
2858
2859 if (! is_i386_elf (ibfd))
2860 continue;
2861
2862 for (s = ibfd->sections; s != NULL; s = s->next)
2863 {
2864 struct elf_dyn_relocs *p;
2865
2866 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2867 return FALSE;
2868
2869 for (p = ((struct elf_dyn_relocs *)
2870 elf_section_data (s)->local_dynrel);
2871 p != NULL;
2872 p = p->next)
2873 {
2874 if (!bfd_is_abs_section (p->sec)
2875 && bfd_is_abs_section (p->sec->output_section))
2876 {
2877 /* Input section has been discarded, either because
2878 it is a copy of a linkonce section or due to
2879 linker script /DISCARD/, so we'll be discarding
2880 the relocs too. */
2881 }
2882 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2883 && strcmp (p->sec->output_section->name,
2884 ".tls_vars") == 0)
2885 {
2886 /* Relocations in vxworks .tls_vars sections are
2887 handled specially by the loader. */
2888 }
2889 else if (p->count != 0)
2890 {
2891 srel = elf_section_data (p->sec)->sreloc;
2892 srel->size += p->count * sizeof (Elf32_External_Rel);
2893 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2894 && (info->flags & DF_TEXTREL) == 0)
2895 {
2896 info->flags |= DF_TEXTREL;
2897 if ((info->warn_shared_textrel && info->shared)
2898 || info->error_textrel)
2899 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2900 p->sec->owner, p->sec);
2901 }
2902 }
2903 }
2904 }
2905
2906 local_got = elf_local_got_refcounts (ibfd);
2907 if (!local_got)
2908 continue;
2909
2910 symtab_hdr = &elf_symtab_hdr (ibfd);
2911 locsymcount = symtab_hdr->sh_info;
2912 end_local_got = local_got + locsymcount;
2913 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2914 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2915 s = htab->elf.sgot;
2916 srel = htab->elf.srelgot;
2917 for (; local_got < end_local_got;
2918 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2919 {
2920 *local_tlsdesc_gotent = (bfd_vma) -1;
2921 if (*local_got > 0)
2922 {
2923 if (GOT_TLS_GDESC_P (*local_tls_type))
2924 {
2925 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2926 - elf_i386_compute_jump_table_size (htab);
2927 htab->elf.sgotplt->size += 8;
2928 *local_got = (bfd_vma) -2;
2929 }
2930 if (! GOT_TLS_GDESC_P (*local_tls_type)
2931 || GOT_TLS_GD_P (*local_tls_type))
2932 {
2933 *local_got = s->size;
2934 s->size += 4;
2935 if (GOT_TLS_GD_P (*local_tls_type)
2936 || *local_tls_type == GOT_TLS_IE_BOTH)
2937 s->size += 4;
2938 }
2939 if (info->shared
2940 || GOT_TLS_GD_ANY_P (*local_tls_type)
2941 || (*local_tls_type & GOT_TLS_IE))
2942 {
2943 if (*local_tls_type == GOT_TLS_IE_BOTH)
2944 srel->size += 2 * sizeof (Elf32_External_Rel);
2945 else if (GOT_TLS_GD_P (*local_tls_type)
2946 || ! GOT_TLS_GDESC_P (*local_tls_type))
2947 srel->size += sizeof (Elf32_External_Rel);
2948 if (GOT_TLS_GDESC_P (*local_tls_type))
2949 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2950 }
2951 }
2952 else
2953 *local_got = (bfd_vma) -1;
2954 }
2955 }
2956
2957 if (htab->tls_ldm_got.refcount > 0)
2958 {
2959 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2960 relocs. */
2961 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2962 htab->elf.sgot->size += 8;
2963 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2964 }
2965 else
2966 htab->tls_ldm_got.offset = -1;
2967
2968 /* Allocate global sym .plt and .got entries, and space for global
2969 sym dynamic relocs. */
2970 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2971
2972 /* Allocate .plt and .got entries, and space for local symbols. */
2973 htab_traverse (htab->loc_hash_table,
2974 elf_i386_allocate_local_dynrelocs,
2975 info);
2976
2977 /* For every jump slot reserved in the sgotplt, reloc_count is
2978 incremented. However, when we reserve space for TLS descriptors,
2979 it's not incremented, so in order to compute the space reserved
2980 for them, it suffices to multiply the reloc count by the jump
2981 slot size.
2982
2983 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2984 so that R_386_IRELATIVE entries come last. */
2985 if (htab->elf.srelplt)
2986 {
2987 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2988 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2989 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2990 }
2991 else if (htab->elf.irelplt)
2992 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2993
2994
2995 if (htab->elf.sgotplt)
2996 {
2997 /* Don't allocate .got.plt section if there are no GOT nor PLT
2998 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2999 if ((htab->elf.hgot == NULL
3000 || !htab->elf.hgot->ref_regular_nonweak)
3001 && (htab->elf.sgotplt->size
3002 == get_elf_backend_data (output_bfd)->got_header_size)
3003 && (htab->elf.splt == NULL
3004 || htab->elf.splt->size == 0)
3005 && (htab->elf.sgot == NULL
3006 || htab->elf.sgot->size == 0)
3007 && (htab->elf.iplt == NULL
3008 || htab->elf.iplt->size == 0)
3009 && (htab->elf.igotplt == NULL
3010 || htab->elf.igotplt->size == 0))
3011 htab->elf.sgotplt->size = 0;
3012 }
3013
3014
3015 if (htab->plt_eh_frame != NULL
3016 && htab->elf.splt != NULL
3017 && htab->elf.splt->size != 0
3018 && !bfd_is_abs_section (htab->elf.splt->output_section)
3019 && _bfd_elf_eh_frame_present (info))
3020 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3021
3022 /* We now have determined the sizes of the various dynamic sections.
3023 Allocate memory for them. */
3024 relocs = FALSE;
3025 for (s = dynobj->sections; s != NULL; s = s->next)
3026 {
3027 bfd_boolean strip_section = TRUE;
3028
3029 if ((s->flags & SEC_LINKER_CREATED) == 0)
3030 continue;
3031
3032 if (s == htab->elf.splt
3033 || s == htab->elf.sgot)
3034 {
3035 /* Strip this section if we don't need it; see the
3036 comment below. */
3037 /* We'd like to strip these sections if they aren't needed, but if
3038 we've exported dynamic symbols from them we must leave them.
3039 It's too late to tell BFD to get rid of the symbols. */
3040
3041 if (htab->elf.hplt != NULL)
3042 strip_section = FALSE;
3043 }
3044 else if (s == htab->elf.sgotplt
3045 || s == htab->elf.iplt
3046 || s == htab->elf.igotplt
3047 || s == htab->plt_got
3048 || s == htab->plt_eh_frame
3049 || s == htab->sdynbss)
3050 {
3051 /* Strip these too. */
3052 }
3053 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3054 {
3055 if (s->size != 0
3056 && s != htab->elf.srelplt
3057 && s != htab->srelplt2)
3058 relocs = TRUE;
3059
3060 /* We use the reloc_count field as a counter if we need
3061 to copy relocs into the output file. */
3062 s->reloc_count = 0;
3063 }
3064 else
3065 {
3066 /* It's not one of our sections, so don't allocate space. */
3067 continue;
3068 }
3069
3070 if (s->size == 0)
3071 {
3072 /* If we don't need this section, strip it from the
3073 output file. This is mostly to handle .rel.bss and
3074 .rel.plt. We must create both sections in
3075 create_dynamic_sections, because they must be created
3076 before the linker maps input sections to output
3077 sections. The linker does that before
3078 adjust_dynamic_symbol is called, and it is that
3079 function which decides whether anything needs to go
3080 into these sections. */
3081 if (strip_section)
3082 s->flags |= SEC_EXCLUDE;
3083 continue;
3084 }
3085
3086 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3087 continue;
3088
3089 /* Allocate memory for the section contents. We use bfd_zalloc
3090 here in case unused entries are not reclaimed before the
3091 section's contents are written out. This should not happen,
3092 but this way if it does, we get a R_386_NONE reloc instead
3093 of garbage. */
3094 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3095 if (s->contents == NULL)
3096 return FALSE;
3097 }
3098
3099 if (htab->plt_eh_frame != NULL
3100 && htab->plt_eh_frame->contents != NULL)
3101 {
3102 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3103 sizeof (elf_i386_eh_frame_plt));
3104 bfd_put_32 (dynobj, htab->elf.splt->size,
3105 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3106 }
3107
3108 if (htab->elf.dynamic_sections_created)
3109 {
3110 /* Add some entries to the .dynamic section. We fill in the
3111 values later, in elf_i386_finish_dynamic_sections, but we
3112 must add the entries now so that we get the correct size for
3113 the .dynamic section. The DT_DEBUG entry is filled in by the
3114 dynamic linker and used by the debugger. */
3115 #define add_dynamic_entry(TAG, VAL) \
3116 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3117
3118 if (info->executable)
3119 {
3120 if (!add_dynamic_entry (DT_DEBUG, 0))
3121 return FALSE;
3122 }
3123
3124 if (htab->elf.splt->size != 0)
3125 {
3126 /* DT_PLTGOT is used by prelink even if there is no PLT
3127 relocation. */
3128 if (!add_dynamic_entry (DT_PLTGOT, 0))
3129 return FALSE;
3130
3131 if (htab->elf.srelplt->size != 0)
3132 {
3133 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3134 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3135 || !add_dynamic_entry (DT_JMPREL, 0))
3136 return FALSE;
3137 }
3138 }
3139
3140 if (relocs)
3141 {
3142 if (!add_dynamic_entry (DT_REL, 0)
3143 || !add_dynamic_entry (DT_RELSZ, 0)
3144 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3145 return FALSE;
3146
3147 /* If any dynamic relocs apply to a read-only section,
3148 then we need a DT_TEXTREL entry. */
3149 if ((info->flags & DF_TEXTREL) == 0)
3150 elf_link_hash_traverse (&htab->elf,
3151 elf_i386_readonly_dynrelocs, info);
3152
3153 if ((info->flags & DF_TEXTREL) != 0)
3154 {
3155 if ((elf_tdata (output_bfd)->has_gnu_symbols
3156 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3157 {
3158 info->callbacks->einfo
3159 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3160 bfd_set_error (bfd_error_bad_value);
3161 return FALSE;
3162 }
3163
3164 if (!add_dynamic_entry (DT_TEXTREL, 0))
3165 return FALSE;
3166 }
3167 }
3168 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3169 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3170 return FALSE;
3171 }
3172 #undef add_dynamic_entry
3173
3174 return TRUE;
3175 }
3176
3177 static bfd_boolean
3178 elf_i386_always_size_sections (bfd *output_bfd,
3179 struct bfd_link_info *info)
3180 {
3181 asection *tls_sec = elf_hash_table (info)->tls_sec;
3182
3183 if (tls_sec)
3184 {
3185 struct elf_link_hash_entry *tlsbase;
3186
3187 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3188 "_TLS_MODULE_BASE_",
3189 FALSE, FALSE, FALSE);
3190
3191 if (tlsbase && tlsbase->type == STT_TLS)
3192 {
3193 struct elf_i386_link_hash_table *htab;
3194 struct bfd_link_hash_entry *bh = NULL;
3195 const struct elf_backend_data *bed
3196 = get_elf_backend_data (output_bfd);
3197
3198 htab = elf_i386_hash_table (info);
3199 if (htab == NULL)
3200 return FALSE;
3201
3202 if (!(_bfd_generic_link_add_one_symbol
3203 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3204 tls_sec, 0, NULL, FALSE,
3205 bed->collect, &bh)))
3206 return FALSE;
3207
3208 htab->tls_module_base = bh;
3209
3210 tlsbase = (struct elf_link_hash_entry *)bh;
3211 tlsbase->def_regular = 1;
3212 tlsbase->other = STV_HIDDEN;
3213 tlsbase->root.linker_def = 1;
3214 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3215 }
3216 }
3217
3218 return TRUE;
3219 }
3220
3221 /* Set the correct type for an x86 ELF section. We do this by the
3222 section name, which is a hack, but ought to work. */
3223
3224 static bfd_boolean
3225 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3226 Elf_Internal_Shdr *hdr,
3227 asection *sec)
3228 {
3229 const char *name;
3230
3231 name = bfd_get_section_name (abfd, sec);
3232
3233 /* This is an ugly, but unfortunately necessary hack that is
3234 needed when producing EFI binaries on x86. It tells
3235 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3236 containing ELF relocation info. We need this hack in order to
3237 be able to generate ELF binaries that can be translated into
3238 EFI applications (which are essentially COFF objects). Those
3239 files contain a COFF ".reloc" section inside an ELFNN object,
3240 which would normally cause BFD to segfault because it would
3241 attempt to interpret this section as containing relocation
3242 entries for section "oc". With this hack enabled, ".reloc"
3243 will be treated as a normal data section, which will avoid the
3244 segfault. However, you won't be able to create an ELFNN binary
3245 with a section named "oc" that needs relocations, but that's
3246 the kind of ugly side-effects you get when detecting section
3247 types based on their names... In practice, this limitation is
3248 unlikely to bite. */
3249 if (strcmp (name, ".reloc") == 0)
3250 hdr->sh_type = SHT_PROGBITS;
3251
3252 return TRUE;
3253 }
3254
3255 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3256 executables. Rather than setting it to the beginning of the TLS
3257 section, we have to set it to the end. This function may be called
3258 multiple times, it is idempotent. */
3259
3260 static void
3261 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3262 {
3263 struct elf_i386_link_hash_table *htab;
3264 struct bfd_link_hash_entry *base;
3265
3266 if (!info->executable)
3267 return;
3268
3269 htab = elf_i386_hash_table (info);
3270 if (htab == NULL)
3271 return;
3272
3273 base = htab->tls_module_base;
3274 if (base == NULL)
3275 return;
3276
3277 base->u.def.value = htab->elf.tls_size;
3278 }
3279
3280 /* Return the base VMA address which should be subtracted from real addresses
3281 when resolving @dtpoff relocation.
3282 This is PT_TLS segment p_vaddr. */
3283
3284 static bfd_vma
3285 elf_i386_dtpoff_base (struct bfd_link_info *info)
3286 {
3287 /* If tls_sec is NULL, we should have signalled an error already. */
3288 if (elf_hash_table (info)->tls_sec == NULL)
3289 return 0;
3290 return elf_hash_table (info)->tls_sec->vma;
3291 }
3292
3293 /* Return the relocation value for @tpoff relocation
3294 if STT_TLS virtual address is ADDRESS. */
3295
3296 static bfd_vma
3297 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3298 {
3299 struct elf_link_hash_table *htab = elf_hash_table (info);
3300 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3301 bfd_vma static_tls_size;
3302
3303 /* If tls_sec is NULL, we should have signalled an error already. */
3304 if (htab->tls_sec == NULL)
3305 return 0;
3306
3307 /* Consider special static TLS alignment requirements. */
3308 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3309 return static_tls_size + htab->tls_sec->vma - address;
3310 }
3311
3312 /* Relocate an i386 ELF section. */
3313
3314 static bfd_boolean
3315 elf_i386_relocate_section (bfd *output_bfd,
3316 struct bfd_link_info *info,
3317 bfd *input_bfd,
3318 asection *input_section,
3319 bfd_byte *contents,
3320 Elf_Internal_Rela *relocs,
3321 Elf_Internal_Sym *local_syms,
3322 asection **local_sections)
3323 {
3324 struct elf_i386_link_hash_table *htab;
3325 Elf_Internal_Shdr *symtab_hdr;
3326 struct elf_link_hash_entry **sym_hashes;
3327 bfd_vma *local_got_offsets;
3328 bfd_vma *local_tlsdesc_gotents;
3329 Elf_Internal_Rela *rel;
3330 Elf_Internal_Rela *relend;
3331 bfd_boolean is_vxworks_tls;
3332 unsigned plt_entry_size;
3333
3334 BFD_ASSERT (is_i386_elf (input_bfd));
3335
3336 htab = elf_i386_hash_table (info);
3337 if (htab == NULL)
3338 return FALSE;
3339 symtab_hdr = &elf_symtab_hdr (input_bfd);
3340 sym_hashes = elf_sym_hashes (input_bfd);
3341 local_got_offsets = elf_local_got_offsets (input_bfd);
3342 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3343 /* We have to handle relocations in vxworks .tls_vars sections
3344 specially, because the dynamic loader is 'weird'. */
3345 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3346 && info->shared
3347 && !strcmp (input_section->output_section->name,
3348 ".tls_vars"));
3349
3350 elf_i386_set_tls_module_base (info);
3351
3352 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3353
3354 rel = relocs;
3355 relend = relocs + input_section->reloc_count;
3356 for (; rel < relend; rel++)
3357 {
3358 unsigned int r_type;
3359 reloc_howto_type *howto;
3360 unsigned long r_symndx;
3361 struct elf_link_hash_entry *h;
3362 struct elf_i386_link_hash_entry *eh;
3363 Elf_Internal_Sym *sym;
3364 asection *sec;
3365 bfd_vma off, offplt, plt_offset;
3366 bfd_vma relocation;
3367 bfd_boolean unresolved_reloc;
3368 bfd_reloc_status_type r;
3369 unsigned int indx;
3370 int tls_type;
3371 bfd_vma st_size;
3372 asection *resolved_plt;
3373
3374 r_type = ELF32_R_TYPE (rel->r_info);
3375 if (r_type == R_386_GNU_VTINHERIT
3376 || r_type == R_386_GNU_VTENTRY)
3377 continue;
3378
3379 if ((indx = r_type) >= R_386_standard
3380 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3381 >= R_386_ext - R_386_standard)
3382 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3383 >= R_386_irelative - R_386_ext))
3384 {
3385 (*_bfd_error_handler)
3386 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3387 input_bfd, input_section, r_type);
3388 bfd_set_error (bfd_error_bad_value);
3389 return FALSE;
3390 }
3391 howto = elf_howto_table + indx;
3392
3393 r_symndx = ELF32_R_SYM (rel->r_info);
3394 h = NULL;
3395 sym = NULL;
3396 sec = NULL;
3397 unresolved_reloc = FALSE;
3398 if (r_symndx < symtab_hdr->sh_info)
3399 {
3400 sym = local_syms + r_symndx;
3401 sec = local_sections[r_symndx];
3402 relocation = (sec->output_section->vma
3403 + sec->output_offset
3404 + sym->st_value);
3405 st_size = sym->st_size;
3406
3407 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3408 && ((sec->flags & SEC_MERGE) != 0
3409 || (info->relocatable
3410 && sec->output_offset != 0)))
3411 {
3412 bfd_vma addend;
3413 bfd_byte *where = contents + rel->r_offset;
3414
3415 switch (howto->size)
3416 {
3417 case 0:
3418 addend = bfd_get_8 (input_bfd, where);
3419 if (howto->pc_relative)
3420 {
3421 addend = (addend ^ 0x80) - 0x80;
3422 addend += 1;
3423 }
3424 break;
3425 case 1:
3426 addend = bfd_get_16 (input_bfd, where);
3427 if (howto->pc_relative)
3428 {
3429 addend = (addend ^ 0x8000) - 0x8000;
3430 addend += 2;
3431 }
3432 break;
3433 case 2:
3434 addend = bfd_get_32 (input_bfd, where);
3435 if (howto->pc_relative)
3436 {
3437 addend = (addend ^ 0x80000000) - 0x80000000;
3438 addend += 4;
3439 }
3440 break;
3441 default:
3442 abort ();
3443 }
3444
3445 if (info->relocatable)
3446 addend += sec->output_offset;
3447 else
3448 {
3449 asection *msec = sec;
3450 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3451 addend);
3452 addend -= relocation;
3453 addend += msec->output_section->vma + msec->output_offset;
3454 }
3455
3456 switch (howto->size)
3457 {
3458 case 0:
3459 /* FIXME: overflow checks. */
3460 if (howto->pc_relative)
3461 addend -= 1;
3462 bfd_put_8 (input_bfd, addend, where);
3463 break;
3464 case 1:
3465 if (howto->pc_relative)
3466 addend -= 2;
3467 bfd_put_16 (input_bfd, addend, where);
3468 break;
3469 case 2:
3470 if (howto->pc_relative)
3471 addend -= 4;
3472 bfd_put_32 (input_bfd, addend, where);
3473 break;
3474 }
3475 }
3476 else if (!info->relocatable
3477 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3478 {
3479 /* Relocate against local STT_GNU_IFUNC symbol. */
3480 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3481 FALSE);
3482 if (h == NULL)
3483 abort ();
3484
3485 /* Set STT_GNU_IFUNC symbol value. */
3486 h->root.u.def.value = sym->st_value;
3487 h->root.u.def.section = sec;
3488 }
3489 }
3490 else
3491 {
3492 bfd_boolean warned ATTRIBUTE_UNUSED;
3493 bfd_boolean ignored ATTRIBUTE_UNUSED;
3494
3495 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3496 r_symndx, symtab_hdr, sym_hashes,
3497 h, sec, relocation,
3498 unresolved_reloc, warned, ignored);
3499 st_size = h->size;
3500 }
3501
3502 if (sec != NULL && discarded_section (sec))
3503 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3504 rel, 1, relend, howto, 0, contents);
3505
3506 if (info->relocatable)
3507 continue;
3508
3509 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3510 it here if it is defined in a non-shared object. */
3511 if (h != NULL
3512 && h->type == STT_GNU_IFUNC
3513 && h->def_regular)
3514 {
3515 asection *plt, *gotplt, *base_got;
3516 bfd_vma plt_index;
3517 const char *name;
3518
3519 if ((input_section->flags & SEC_ALLOC) == 0)
3520 {
3521 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3522 sections because such sections are not SEC_ALLOC and
3523 thus ld.so will not process them. */
3524 if ((input_section->flags & SEC_DEBUGGING) != 0)
3525 continue;
3526 abort ();
3527 }
3528 else if (h->plt.offset == (bfd_vma) -1)
3529 abort ();
3530
3531 /* STT_GNU_IFUNC symbol must go through PLT. */
3532 if (htab->elf.splt != NULL)
3533 {
3534 plt = htab->elf.splt;
3535 gotplt = htab->elf.sgotplt;
3536 }
3537 else
3538 {
3539 plt = htab->elf.iplt;
3540 gotplt = htab->elf.igotplt;
3541 }
3542
3543 relocation = (plt->output_section->vma
3544 + plt->output_offset + h->plt.offset);
3545
3546 switch (r_type)
3547 {
3548 default:
3549 if (h->root.root.string)
3550 name = h->root.root.string;
3551 else
3552 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3553 NULL);
3554 (*_bfd_error_handler)
3555 (_("%B: relocation %s against STT_GNU_IFUNC "
3556 "symbol `%s' isn't handled by %s"), input_bfd,
3557 elf_howto_table[r_type].name,
3558 name, __FUNCTION__);
3559 bfd_set_error (bfd_error_bad_value);
3560 return FALSE;
3561
3562 case R_386_32:
3563 /* Generate dynamic relcoation only when there is a
3564 non-GOT reference in a shared object. */
3565 if (info->shared && h->non_got_ref)
3566 {
3567 Elf_Internal_Rela outrel;
3568 asection *sreloc;
3569 bfd_vma offset;
3570
3571 /* Need a dynamic relocation to get the real function
3572 adddress. */
3573 offset = _bfd_elf_section_offset (output_bfd,
3574 info,
3575 input_section,
3576 rel->r_offset);
3577 if (offset == (bfd_vma) -1
3578 || offset == (bfd_vma) -2)
3579 abort ();
3580
3581 outrel.r_offset = (input_section->output_section->vma
3582 + input_section->output_offset
3583 + offset);
3584
3585 if (h->dynindx == -1
3586 || h->forced_local
3587 || info->executable)
3588 {
3589 /* This symbol is resolved locally. */
3590 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3591 bfd_put_32 (output_bfd,
3592 (h->root.u.def.value
3593 + h->root.u.def.section->output_section->vma
3594 + h->root.u.def.section->output_offset),
3595 contents + offset);
3596 }
3597 else
3598 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3599
3600 sreloc = htab->elf.irelifunc;
3601 elf_append_rel (output_bfd, sreloc, &outrel);
3602
3603 /* If this reloc is against an external symbol, we
3604 do not want to fiddle with the addend. Otherwise,
3605 we need to include the symbol value so that it
3606 becomes an addend for the dynamic reloc. For an
3607 internal symbol, we have updated addend. */
3608 continue;
3609 }
3610 /* FALLTHROUGH */
3611 case R_386_PC32:
3612 case R_386_PLT32:
3613 goto do_relocation;
3614
3615 case R_386_GOT32:
3616 base_got = htab->elf.sgot;
3617 off = h->got.offset;
3618
3619 if (base_got == NULL)
3620 abort ();
3621
3622 if (off == (bfd_vma) -1)
3623 {
3624 /* We can't use h->got.offset here to save state, or
3625 even just remember the offset, as finish_dynamic_symbol
3626 would use that as offset into .got. */
3627
3628 if (htab->elf.splt != NULL)
3629 {
3630 plt_index = h->plt.offset / plt_entry_size - 1;
3631 off = (plt_index + 3) * 4;
3632 base_got = htab->elf.sgotplt;
3633 }
3634 else
3635 {
3636 plt_index = h->plt.offset / plt_entry_size;
3637 off = plt_index * 4;
3638 base_got = htab->elf.igotplt;
3639 }
3640
3641 if (h->dynindx == -1
3642 || h->forced_local
3643 || info->symbolic)
3644 {
3645 /* This references the local defitionion. We must
3646 initialize this entry in the global offset table.
3647 Since the offset must always be a multiple of 8,
3648 we use the least significant bit to record
3649 whether we have initialized it already.
3650
3651 When doing a dynamic link, we create a .rela.got
3652 relocation entry to initialize the value. This
3653 is done in the finish_dynamic_symbol routine. */
3654 if ((off & 1) != 0)
3655 off &= ~1;
3656 else
3657 {
3658 bfd_put_32 (output_bfd, relocation,
3659 base_got->contents + off);
3660 h->got.offset |= 1;
3661 }
3662 }
3663
3664 relocation = off;
3665
3666 /* Adjust for static executables. */
3667 if (htab->elf.splt == NULL)
3668 relocation += gotplt->output_offset;
3669 }
3670 else
3671 {
3672 relocation = (base_got->output_section->vma
3673 + base_got->output_offset + off
3674 - gotplt->output_section->vma
3675 - gotplt->output_offset);
3676 /* Adjust for static executables. */
3677 if (htab->elf.splt == NULL)
3678 relocation += gotplt->output_offset;
3679 }
3680
3681 goto do_relocation;
3682
3683 case R_386_GOTOFF:
3684 relocation -= (gotplt->output_section->vma
3685 + gotplt->output_offset);
3686 goto do_relocation;
3687 }
3688 }
3689
3690 switch (r_type)
3691 {
3692 case R_386_GOT32:
3693 /* Relocation is to the entry for this symbol in the global
3694 offset table. */
3695 if (htab->elf.sgot == NULL)
3696 abort ();
3697
3698 if (h != NULL)
3699 {
3700 bfd_boolean dyn;
3701
3702 off = h->got.offset;
3703 dyn = htab->elf.dynamic_sections_created;
3704 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3705 || (info->shared
3706 && SYMBOL_REFERENCES_LOCAL (info, h))
3707 || (ELF_ST_VISIBILITY (h->other)
3708 && h->root.type == bfd_link_hash_undefweak))
3709 {
3710 /* This is actually a static link, or it is a
3711 -Bsymbolic link and the symbol is defined
3712 locally, or the symbol was forced to be local
3713 because of a version file. We must initialize
3714 this entry in the global offset table. Since the
3715 offset must always be a multiple of 4, we use the
3716 least significant bit to record whether we have
3717 initialized it already.
3718
3719 When doing a dynamic link, we create a .rel.got
3720 relocation entry to initialize the value. This
3721 is done in the finish_dynamic_symbol routine. */
3722 if ((off & 1) != 0)
3723 off &= ~1;
3724 else
3725 {
3726 bfd_put_32 (output_bfd, relocation,
3727 htab->elf.sgot->contents + off);
3728 h->got.offset |= 1;
3729 }
3730 }
3731 else
3732 unresolved_reloc = FALSE;
3733 }
3734 else
3735 {
3736 if (local_got_offsets == NULL)
3737 abort ();
3738
3739 off = local_got_offsets[r_symndx];
3740
3741 /* The offset must always be a multiple of 4. We use
3742 the least significant bit to record whether we have
3743 already generated the necessary reloc. */
3744 if ((off & 1) != 0)
3745 off &= ~1;
3746 else
3747 {
3748 bfd_put_32 (output_bfd, relocation,
3749 htab->elf.sgot->contents + off);
3750
3751 if (info->shared)
3752 {
3753 asection *s;
3754 Elf_Internal_Rela outrel;
3755
3756 s = htab->elf.srelgot;
3757 if (s == NULL)
3758 abort ();
3759
3760 outrel.r_offset = (htab->elf.sgot->output_section->vma
3761 + htab->elf.sgot->output_offset
3762 + off);
3763 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3764 elf_append_rel (output_bfd, s, &outrel);
3765 }
3766
3767 local_got_offsets[r_symndx] |= 1;
3768 }
3769 }
3770
3771 if (off >= (bfd_vma) -2)
3772 abort ();
3773
3774 relocation = htab->elf.sgot->output_section->vma
3775 + htab->elf.sgot->output_offset + off
3776 - htab->elf.sgotplt->output_section->vma
3777 - htab->elf.sgotplt->output_offset;
3778 break;
3779
3780 case R_386_GOTOFF:
3781 /* Relocation is relative to the start of the global offset
3782 table. */
3783
3784 /* Check to make sure it isn't a protected function or data
3785 symbol for shared library since it may not be local when
3786 used as function address or with copy relocation. We also
3787 need to make sure that a symbol is referenced locally. */
3788 if (!info->executable && h)
3789 {
3790 if (!h->def_regular)
3791 {
3792 const char *v;
3793
3794 switch (ELF_ST_VISIBILITY (h->other))
3795 {
3796 case STV_HIDDEN:
3797 v = _("hidden symbol");
3798 break;
3799 case STV_INTERNAL:
3800 v = _("internal symbol");
3801 break;
3802 case STV_PROTECTED:
3803 v = _("protected symbol");
3804 break;
3805 default:
3806 v = _("symbol");
3807 break;
3808 }
3809
3810 (*_bfd_error_handler)
3811 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3812 input_bfd, v, h->root.root.string);
3813 bfd_set_error (bfd_error_bad_value);
3814 return FALSE;
3815 }
3816 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3817 && (h->type == STT_FUNC
3818 || h->type == STT_OBJECT)
3819 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3820 {
3821 (*_bfd_error_handler)
3822 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
3823 input_bfd,
3824 h->type == STT_FUNC ? "function" : "data",
3825 h->root.root.string);
3826 bfd_set_error (bfd_error_bad_value);
3827 return FALSE;
3828 }
3829 }
3830
3831 /* Note that sgot is not involved in this
3832 calculation. We always want the start of .got.plt. If we
3833 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3834 permitted by the ABI, we might have to change this
3835 calculation. */
3836 relocation -= htab->elf.sgotplt->output_section->vma
3837 + htab->elf.sgotplt->output_offset;
3838 break;
3839
3840 case R_386_GOTPC:
3841 /* Use global offset table as symbol value. */
3842 relocation = htab->elf.sgotplt->output_section->vma
3843 + htab->elf.sgotplt->output_offset;
3844 unresolved_reloc = FALSE;
3845 break;
3846
3847 case R_386_PLT32:
3848 /* Relocation is to the entry for this symbol in the
3849 procedure linkage table. */
3850
3851 /* Resolve a PLT32 reloc against a local symbol directly,
3852 without using the procedure linkage table. */
3853 if (h == NULL)
3854 break;
3855
3856 eh = (struct elf_i386_link_hash_entry *) h;
3857 if ((h->plt.offset == (bfd_vma) -1
3858 && eh->plt_got.offset == (bfd_vma) -1)
3859 || htab->elf.splt == NULL)
3860 {
3861 /* We didn't make a PLT entry for this symbol. This
3862 happens when statically linking PIC code, or when
3863 using -Bsymbolic. */
3864 break;
3865 }
3866
3867 if (h->plt.offset != (bfd_vma) -1)
3868 {
3869 resolved_plt = htab->elf.splt;
3870 plt_offset = h->plt.offset;
3871 }
3872 else
3873 {
3874 resolved_plt = htab->plt_got;
3875 plt_offset = eh->plt_got.offset;
3876 }
3877
3878 relocation = (resolved_plt->output_section->vma
3879 + resolved_plt->output_offset
3880 + plt_offset);
3881 unresolved_reloc = FALSE;
3882 break;
3883
3884 case R_386_SIZE32:
3885 /* Set to symbol size. */
3886 relocation = st_size;
3887 /* Fall through. */
3888
3889 case R_386_32:
3890 case R_386_PC32:
3891 if ((input_section->flags & SEC_ALLOC) == 0
3892 || is_vxworks_tls)
3893 break;
3894
3895 if ((info->shared
3896 && (h == NULL
3897 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3898 || h->root.type != bfd_link_hash_undefweak)
3899 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3900 || !SYMBOL_CALLS_LOCAL (info, h)))
3901 || (ELIMINATE_COPY_RELOCS
3902 && !info->shared
3903 && h != NULL
3904 && h->dynindx != -1
3905 && !h->non_got_ref
3906 && ((h->def_dynamic
3907 && !h->def_regular)
3908 || h->root.type == bfd_link_hash_undefweak
3909 || h->root.type == bfd_link_hash_undefined)))
3910 {
3911 Elf_Internal_Rela outrel;
3912 bfd_boolean skip, relocate;
3913 asection *sreloc;
3914
3915 /* When generating a shared object, these relocations
3916 are copied into the output file to be resolved at run
3917 time. */
3918
3919 skip = FALSE;
3920 relocate = FALSE;
3921
3922 outrel.r_offset =
3923 _bfd_elf_section_offset (output_bfd, info, input_section,
3924 rel->r_offset);
3925 if (outrel.r_offset == (bfd_vma) -1)
3926 skip = TRUE;
3927 else if (outrel.r_offset == (bfd_vma) -2)
3928 skip = TRUE, relocate = TRUE;
3929 outrel.r_offset += (input_section->output_section->vma
3930 + input_section->output_offset);
3931
3932 if (skip)
3933 memset (&outrel, 0, sizeof outrel);
3934 else if (h != NULL
3935 && h->dynindx != -1
3936 && (r_type == R_386_PC32
3937 || !info->shared
3938 || !SYMBOLIC_BIND (info, h)
3939 || !h->def_regular))
3940 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3941 else
3942 {
3943 /* This symbol is local, or marked to become local. */
3944 relocate = TRUE;
3945 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3946 }
3947
3948 sreloc = elf_section_data (input_section)->sreloc;
3949
3950 if (sreloc == NULL || sreloc->contents == NULL)
3951 {
3952 r = bfd_reloc_notsupported;
3953 goto check_relocation_error;
3954 }
3955
3956 elf_append_rel (output_bfd, sreloc, &outrel);
3957
3958 /* If this reloc is against an external symbol, we do
3959 not want to fiddle with the addend. Otherwise, we
3960 need to include the symbol value so that it becomes
3961 an addend for the dynamic reloc. */
3962 if (! relocate)
3963 continue;
3964 }
3965 break;
3966
3967 case R_386_TLS_IE:
3968 if (!info->executable)
3969 {
3970 Elf_Internal_Rela outrel;
3971 asection *sreloc;
3972
3973 outrel.r_offset = rel->r_offset
3974 + input_section->output_section->vma
3975 + input_section->output_offset;
3976 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3977 sreloc = elf_section_data (input_section)->sreloc;
3978 if (sreloc == NULL)
3979 abort ();
3980 elf_append_rel (output_bfd, sreloc, &outrel);
3981 }
3982 /* Fall through */
3983
3984 case R_386_TLS_GD:
3985 case R_386_TLS_GOTDESC:
3986 case R_386_TLS_DESC_CALL:
3987 case R_386_TLS_IE_32:
3988 case R_386_TLS_GOTIE:
3989 tls_type = GOT_UNKNOWN;
3990 if (h == NULL && local_got_offsets)
3991 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3992 else if (h != NULL)
3993 tls_type = elf_i386_hash_entry(h)->tls_type;
3994 if (tls_type == GOT_TLS_IE)
3995 tls_type = GOT_TLS_IE_NEG;
3996
3997 if (! elf_i386_tls_transition (info, input_bfd,
3998 input_section, contents,
3999 symtab_hdr, sym_hashes,
4000 &r_type, tls_type, rel,
4001 relend, h, r_symndx))
4002 return FALSE;
4003
4004 if (r_type == R_386_TLS_LE_32)
4005 {
4006 BFD_ASSERT (! unresolved_reloc);
4007 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4008 {
4009 unsigned int type;
4010 bfd_vma roff;
4011
4012 /* GD->LE transition. */
4013 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4014 if (type == 0x04)
4015 {
4016 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4017 Change it into:
4018 movl %gs:0, %eax; subl $foo@tpoff, %eax
4019 (6 byte form of subl). */
4020 memcpy (contents + rel->r_offset - 3,
4021 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4022 roff = rel->r_offset + 5;
4023 }
4024 else
4025 {
4026 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4027 Change it into:
4028 movl %gs:0, %eax; subl $foo@tpoff, %eax
4029 (6 byte form of subl). */
4030 memcpy (contents + rel->r_offset - 2,
4031 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4032 roff = rel->r_offset + 6;
4033 }
4034 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4035 contents + roff);
4036 /* Skip R_386_PC32/R_386_PLT32. */
4037 rel++;
4038 continue;
4039 }
4040 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4041 {
4042 /* GDesc -> LE transition.
4043 It's originally something like:
4044 leal x@tlsdesc(%ebx), %eax
4045
4046 leal x@ntpoff, %eax
4047
4048 Registers other than %eax may be set up here. */
4049
4050 unsigned int val;
4051 bfd_vma roff;
4052
4053 roff = rel->r_offset;
4054 val = bfd_get_8 (input_bfd, contents + roff - 1);
4055
4056 /* Now modify the instruction as appropriate. */
4057 /* aoliva FIXME: remove the above and xor the byte
4058 below with 0x86. */
4059 bfd_put_8 (output_bfd, val ^ 0x86,
4060 contents + roff - 1);
4061 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4062 contents + roff);
4063 continue;
4064 }
4065 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4066 {
4067 /* GDesc -> LE transition.
4068 It's originally:
4069 call *(%eax)
4070 Turn it into:
4071 xchg %ax,%ax */
4072
4073 bfd_vma roff;
4074
4075 roff = rel->r_offset;
4076 bfd_put_8 (output_bfd, 0x66, contents + roff);
4077 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4078 continue;
4079 }
4080 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4081 {
4082 unsigned int val;
4083
4084 /* IE->LE transition:
4085 Originally it can be one of:
4086 movl foo, %eax
4087 movl foo, %reg
4088 addl foo, %reg
4089 We change it into:
4090 movl $foo, %eax
4091 movl $foo, %reg
4092 addl $foo, %reg. */
4093 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4094 if (val == 0xa1)
4095 {
4096 /* movl foo, %eax. */
4097 bfd_put_8 (output_bfd, 0xb8,
4098 contents + rel->r_offset - 1);
4099 }
4100 else
4101 {
4102 unsigned int type;
4103
4104 type = bfd_get_8 (input_bfd,
4105 contents + rel->r_offset - 2);
4106 switch (type)
4107 {
4108 case 0x8b:
4109 /* movl */
4110 bfd_put_8 (output_bfd, 0xc7,
4111 contents + rel->r_offset - 2);
4112 bfd_put_8 (output_bfd,
4113 0xc0 | ((val >> 3) & 7),
4114 contents + rel->r_offset - 1);
4115 break;
4116 case 0x03:
4117 /* addl */
4118 bfd_put_8 (output_bfd, 0x81,
4119 contents + rel->r_offset - 2);
4120 bfd_put_8 (output_bfd,
4121 0xc0 | ((val >> 3) & 7),
4122 contents + rel->r_offset - 1);
4123 break;
4124 default:
4125 BFD_FAIL ();
4126 break;
4127 }
4128 }
4129 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4130 contents + rel->r_offset);
4131 continue;
4132 }
4133 else
4134 {
4135 unsigned int val, type;
4136
4137 /* {IE_32,GOTIE}->LE transition:
4138 Originally it can be one of:
4139 subl foo(%reg1), %reg2
4140 movl foo(%reg1), %reg2
4141 addl foo(%reg1), %reg2
4142 We change it into:
4143 subl $foo, %reg2
4144 movl $foo, %reg2 (6 byte form)
4145 addl $foo, %reg2. */
4146 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4147 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4148 if (type == 0x8b)
4149 {
4150 /* movl */
4151 bfd_put_8 (output_bfd, 0xc7,
4152 contents + rel->r_offset - 2);
4153 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4154 contents + rel->r_offset - 1);
4155 }
4156 else if (type == 0x2b)
4157 {
4158 /* subl */
4159 bfd_put_8 (output_bfd, 0x81,
4160 contents + rel->r_offset - 2);
4161 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4162 contents + rel->r_offset - 1);
4163 }
4164 else if (type == 0x03)
4165 {
4166 /* addl */
4167 bfd_put_8 (output_bfd, 0x81,
4168 contents + rel->r_offset - 2);
4169 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4170 contents + rel->r_offset - 1);
4171 }
4172 else
4173 BFD_FAIL ();
4174 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4175 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4176 contents + rel->r_offset);
4177 else
4178 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4179 contents + rel->r_offset);
4180 continue;
4181 }
4182 }
4183
4184 if (htab->elf.sgot == NULL)
4185 abort ();
4186
4187 if (h != NULL)
4188 {
4189 off = h->got.offset;
4190 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4191 }
4192 else
4193 {
4194 if (local_got_offsets == NULL)
4195 abort ();
4196
4197 off = local_got_offsets[r_symndx];
4198 offplt = local_tlsdesc_gotents[r_symndx];
4199 }
4200
4201 if ((off & 1) != 0)
4202 off &= ~1;
4203 else
4204 {
4205 Elf_Internal_Rela outrel;
4206 int dr_type;
4207 asection *sreloc;
4208
4209 if (htab->elf.srelgot == NULL)
4210 abort ();
4211
4212 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4213
4214 if (GOT_TLS_GDESC_P (tls_type))
4215 {
4216 bfd_byte *loc;
4217 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4218 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4219 <= htab->elf.sgotplt->size);
4220 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4221 + htab->elf.sgotplt->output_offset
4222 + offplt
4223 + htab->sgotplt_jump_table_size);
4224 sreloc = htab->elf.srelplt;
4225 loc = sreloc->contents;
4226 loc += (htab->next_tls_desc_index++
4227 * sizeof (Elf32_External_Rel));
4228 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4229 <= sreloc->contents + sreloc->size);
4230 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4231 if (indx == 0)
4232 {
4233 BFD_ASSERT (! unresolved_reloc);
4234 bfd_put_32 (output_bfd,
4235 relocation - elf_i386_dtpoff_base (info),
4236 htab->elf.sgotplt->contents + offplt
4237 + htab->sgotplt_jump_table_size + 4);
4238 }
4239 else
4240 {
4241 bfd_put_32 (output_bfd, 0,
4242 htab->elf.sgotplt->contents + offplt
4243 + htab->sgotplt_jump_table_size + 4);
4244 }
4245 }
4246
4247 sreloc = htab->elf.srelgot;
4248
4249 outrel.r_offset = (htab->elf.sgot->output_section->vma
4250 + htab->elf.sgot->output_offset + off);
4251
4252 if (GOT_TLS_GD_P (tls_type))
4253 dr_type = R_386_TLS_DTPMOD32;
4254 else if (GOT_TLS_GDESC_P (tls_type))
4255 goto dr_done;
4256 else if (tls_type == GOT_TLS_IE_POS)
4257 dr_type = R_386_TLS_TPOFF;
4258 else
4259 dr_type = R_386_TLS_TPOFF32;
4260
4261 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4262 bfd_put_32 (output_bfd,
4263 relocation - elf_i386_dtpoff_base (info),
4264 htab->elf.sgot->contents + off);
4265 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4266 bfd_put_32 (output_bfd,
4267 elf_i386_dtpoff_base (info) - relocation,
4268 htab->elf.sgot->contents + off);
4269 else if (dr_type != R_386_TLS_DESC)
4270 bfd_put_32 (output_bfd, 0,
4271 htab->elf.sgot->contents + off);
4272 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4273
4274 elf_append_rel (output_bfd, sreloc, &outrel);
4275
4276 if (GOT_TLS_GD_P (tls_type))
4277 {
4278 if (indx == 0)
4279 {
4280 BFD_ASSERT (! unresolved_reloc);
4281 bfd_put_32 (output_bfd,
4282 relocation - elf_i386_dtpoff_base (info),
4283 htab->elf.sgot->contents + off + 4);
4284 }
4285 else
4286 {
4287 bfd_put_32 (output_bfd, 0,
4288 htab->elf.sgot->contents + off + 4);
4289 outrel.r_info = ELF32_R_INFO (indx,
4290 R_386_TLS_DTPOFF32);
4291 outrel.r_offset += 4;
4292 elf_append_rel (output_bfd, sreloc, &outrel);
4293 }
4294 }
4295 else if (tls_type == GOT_TLS_IE_BOTH)
4296 {
4297 bfd_put_32 (output_bfd,
4298 (indx == 0
4299 ? relocation - elf_i386_dtpoff_base (info)
4300 : 0),
4301 htab->elf.sgot->contents + off + 4);
4302 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4303 outrel.r_offset += 4;
4304 elf_append_rel (output_bfd, sreloc, &outrel);
4305 }
4306
4307 dr_done:
4308 if (h != NULL)
4309 h->got.offset |= 1;
4310 else
4311 local_got_offsets[r_symndx] |= 1;
4312 }
4313
4314 if (off >= (bfd_vma) -2
4315 && ! GOT_TLS_GDESC_P (tls_type))
4316 abort ();
4317 if (r_type == R_386_TLS_GOTDESC
4318 || r_type == R_386_TLS_DESC_CALL)
4319 {
4320 relocation = htab->sgotplt_jump_table_size + offplt;
4321 unresolved_reloc = FALSE;
4322 }
4323 else if (r_type == ELF32_R_TYPE (rel->r_info))
4324 {
4325 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4326 + htab->elf.sgotplt->output_offset;
4327 relocation = htab->elf.sgot->output_section->vma
4328 + htab->elf.sgot->output_offset + off - g_o_t;
4329 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4330 && tls_type == GOT_TLS_IE_BOTH)
4331 relocation += 4;
4332 if (r_type == R_386_TLS_IE)
4333 relocation += g_o_t;
4334 unresolved_reloc = FALSE;
4335 }
4336 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4337 {
4338 unsigned int val, type;
4339 bfd_vma roff;
4340
4341 /* GD->IE transition. */
4342 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4343 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4344 if (type == 0x04)
4345 {
4346 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4347 Change it into:
4348 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4349 val >>= 3;
4350 roff = rel->r_offset - 3;
4351 }
4352 else
4353 {
4354 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4355 Change it into:
4356 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4357 roff = rel->r_offset - 2;
4358 }
4359 memcpy (contents + roff,
4360 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4361 contents[roff + 7] = 0x80 | (val & 7);
4362 /* If foo is used only with foo@gotntpoff(%reg) and
4363 foo@indntpoff, but not with foo@gottpoff(%reg), change
4364 subl $foo@gottpoff(%reg), %eax
4365 into:
4366 addl $foo@gotntpoff(%reg), %eax. */
4367 if (tls_type == GOT_TLS_IE_POS)
4368 contents[roff + 6] = 0x03;
4369 bfd_put_32 (output_bfd,
4370 htab->elf.sgot->output_section->vma
4371 + htab->elf.sgot->output_offset + off
4372 - htab->elf.sgotplt->output_section->vma
4373 - htab->elf.sgotplt->output_offset,
4374 contents + roff + 8);
4375 /* Skip R_386_PLT32. */
4376 rel++;
4377 continue;
4378 }
4379 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4380 {
4381 /* GDesc -> IE transition.
4382 It's originally something like:
4383 leal x@tlsdesc(%ebx), %eax
4384
4385 Change it to:
4386 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4387 or:
4388 movl x@gottpoff(%ebx), %eax # before negl %eax
4389
4390 Registers other than %eax may be set up here. */
4391
4392 bfd_vma roff;
4393
4394 /* First, make sure it's a leal adding ebx to a 32-bit
4395 offset into any register, although it's probably
4396 almost always going to be eax. */
4397 roff = rel->r_offset;
4398
4399 /* Now modify the instruction as appropriate. */
4400 /* To turn a leal into a movl in the form we use it, it
4401 suffices to change the first byte from 0x8d to 0x8b.
4402 aoliva FIXME: should we decide to keep the leal, all
4403 we have to do is remove the statement below, and
4404 adjust the relaxation of R_386_TLS_DESC_CALL. */
4405 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4406
4407 if (tls_type == GOT_TLS_IE_BOTH)
4408 off += 4;
4409
4410 bfd_put_32 (output_bfd,
4411 htab->elf.sgot->output_section->vma
4412 + htab->elf.sgot->output_offset + off
4413 - htab->elf.sgotplt->output_section->vma
4414 - htab->elf.sgotplt->output_offset,
4415 contents + roff);
4416 continue;
4417 }
4418 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4419 {
4420 /* GDesc -> IE transition.
4421 It's originally:
4422 call *(%eax)
4423
4424 Change it to:
4425 xchg %ax,%ax
4426 or
4427 negl %eax
4428 depending on how we transformed the TLS_GOTDESC above.
4429 */
4430
4431 bfd_vma roff;
4432
4433 roff = rel->r_offset;
4434
4435 /* Now modify the instruction as appropriate. */
4436 if (tls_type != GOT_TLS_IE_NEG)
4437 {
4438 /* xchg %ax,%ax */
4439 bfd_put_8 (output_bfd, 0x66, contents + roff);
4440 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4441 }
4442 else
4443 {
4444 /* negl %eax */
4445 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4446 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4447 }
4448
4449 continue;
4450 }
4451 else
4452 BFD_ASSERT (FALSE);
4453 break;
4454
4455 case R_386_TLS_LDM:
4456 if (! elf_i386_tls_transition (info, input_bfd,
4457 input_section, contents,
4458 symtab_hdr, sym_hashes,
4459 &r_type, GOT_UNKNOWN, rel,
4460 relend, h, r_symndx))
4461 return FALSE;
4462
4463 if (r_type != R_386_TLS_LDM)
4464 {
4465 /* LD->LE transition:
4466 leal foo(%reg), %eax; call ___tls_get_addr.
4467 We change it into:
4468 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4469 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4470 memcpy (contents + rel->r_offset - 2,
4471 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4472 /* Skip R_386_PC32/R_386_PLT32. */
4473 rel++;
4474 continue;
4475 }
4476
4477 if (htab->elf.sgot == NULL)
4478 abort ();
4479
4480 off = htab->tls_ldm_got.offset;
4481 if (off & 1)
4482 off &= ~1;
4483 else
4484 {
4485 Elf_Internal_Rela outrel;
4486
4487 if (htab->elf.srelgot == NULL)
4488 abort ();
4489
4490 outrel.r_offset = (htab->elf.sgot->output_section->vma
4491 + htab->elf.sgot->output_offset + off);
4492
4493 bfd_put_32 (output_bfd, 0,
4494 htab->elf.sgot->contents + off);
4495 bfd_put_32 (output_bfd, 0,
4496 htab->elf.sgot->contents + off + 4);
4497 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4498 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4499 htab->tls_ldm_got.offset |= 1;
4500 }
4501 relocation = htab->elf.sgot->output_section->vma
4502 + htab->elf.sgot->output_offset + off
4503 - htab->elf.sgotplt->output_section->vma
4504 - htab->elf.sgotplt->output_offset;
4505 unresolved_reloc = FALSE;
4506 break;
4507
4508 case R_386_TLS_LDO_32:
4509 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4510 relocation -= elf_i386_dtpoff_base (info);
4511 else
4512 /* When converting LDO to LE, we must negate. */
4513 relocation = -elf_i386_tpoff (info, relocation);
4514 break;
4515
4516 case R_386_TLS_LE_32:
4517 case R_386_TLS_LE:
4518 if (!info->executable)
4519 {
4520 Elf_Internal_Rela outrel;
4521 asection *sreloc;
4522
4523 outrel.r_offset = rel->r_offset
4524 + input_section->output_section->vma
4525 + input_section->output_offset;
4526 if (h != NULL && h->dynindx != -1)
4527 indx = h->dynindx;
4528 else
4529 indx = 0;
4530 if (r_type == R_386_TLS_LE_32)
4531 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4532 else
4533 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4534 sreloc = elf_section_data (input_section)->sreloc;
4535 if (sreloc == NULL)
4536 abort ();
4537 elf_append_rel (output_bfd, sreloc, &outrel);
4538 if (indx)
4539 continue;
4540 else if (r_type == R_386_TLS_LE_32)
4541 relocation = elf_i386_dtpoff_base (info) - relocation;
4542 else
4543 relocation -= elf_i386_dtpoff_base (info);
4544 }
4545 else if (r_type == R_386_TLS_LE_32)
4546 relocation = elf_i386_tpoff (info, relocation);
4547 else
4548 relocation = -elf_i386_tpoff (info, relocation);
4549 break;
4550
4551 default:
4552 break;
4553 }
4554
4555 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4556 because such sections are not SEC_ALLOC and thus ld.so will
4557 not process them. */
4558 if (unresolved_reloc
4559 && !((input_section->flags & SEC_DEBUGGING) != 0
4560 && h->def_dynamic)
4561 && _bfd_elf_section_offset (output_bfd, info, input_section,
4562 rel->r_offset) != (bfd_vma) -1)
4563 {
4564 (*_bfd_error_handler)
4565 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4566 input_bfd,
4567 input_section,
4568 (long) rel->r_offset,
4569 howto->name,
4570 h->root.root.string);
4571 return FALSE;
4572 }
4573
4574 do_relocation:
4575 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4576 contents, rel->r_offset,
4577 relocation, 0);
4578
4579 check_relocation_error:
4580 if (r != bfd_reloc_ok)
4581 {
4582 const char *name;
4583
4584 if (h != NULL)
4585 name = h->root.root.string;
4586 else
4587 {
4588 name = bfd_elf_string_from_elf_section (input_bfd,
4589 symtab_hdr->sh_link,
4590 sym->st_name);
4591 if (name == NULL)
4592 return FALSE;
4593 if (*name == '\0')
4594 name = bfd_section_name (input_bfd, sec);
4595 }
4596
4597 if (r == bfd_reloc_overflow)
4598 {
4599 if (! ((*info->callbacks->reloc_overflow)
4600 (info, (h ? &h->root : NULL), name, howto->name,
4601 (bfd_vma) 0, input_bfd, input_section,
4602 rel->r_offset)))
4603 return FALSE;
4604 }
4605 else
4606 {
4607 (*_bfd_error_handler)
4608 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4609 input_bfd, input_section,
4610 (long) rel->r_offset, name, (int) r);
4611 return FALSE;
4612 }
4613 }
4614 }
4615
4616 return TRUE;
4617 }
4618
4619 /* Finish up dynamic symbol handling. We set the contents of various
4620 dynamic sections here. */
4621
4622 static bfd_boolean
4623 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4624 struct bfd_link_info *info,
4625 struct elf_link_hash_entry *h,
4626 Elf_Internal_Sym *sym)
4627 {
4628 struct elf_i386_link_hash_table *htab;
4629 unsigned plt_entry_size;
4630 const struct elf_i386_backend_data *abed;
4631 struct elf_i386_link_hash_entry *eh;
4632
4633 htab = elf_i386_hash_table (info);
4634 if (htab == NULL)
4635 return FALSE;
4636
4637 abed = get_elf_i386_backend_data (output_bfd);
4638 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4639
4640 eh = (struct elf_i386_link_hash_entry *) h;
4641
4642 if (h->plt.offset != (bfd_vma) -1)
4643 {
4644 bfd_vma plt_index;
4645 bfd_vma got_offset;
4646 Elf_Internal_Rela rel;
4647 bfd_byte *loc;
4648 asection *plt, *gotplt, *relplt;
4649
4650 /* When building a static executable, use .iplt, .igot.plt and
4651 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4652 if (htab->elf.splt != NULL)
4653 {
4654 plt = htab->elf.splt;
4655 gotplt = htab->elf.sgotplt;
4656 relplt = htab->elf.srelplt;
4657 }
4658 else
4659 {
4660 plt = htab->elf.iplt;
4661 gotplt = htab->elf.igotplt;
4662 relplt = htab->elf.irelplt;
4663 }
4664
4665 /* This symbol has an entry in the procedure linkage table. Set
4666 it up. */
4667
4668 if ((h->dynindx == -1
4669 && !((h->forced_local || info->executable)
4670 && h->def_regular
4671 && h->type == STT_GNU_IFUNC))
4672 || plt == NULL
4673 || gotplt == NULL
4674 || relplt == NULL)
4675 abort ();
4676
4677 /* Get the index in the procedure linkage table which
4678 corresponds to this symbol. This is the index of this symbol
4679 in all the symbols for which we are making plt entries. The
4680 first entry in the procedure linkage table is reserved.
4681
4682 Get the offset into the .got table of the entry that
4683 corresponds to this function. Each .got entry is 4 bytes.
4684 The first three are reserved.
4685
4686 For static executables, we don't reserve anything. */
4687
4688 if (plt == htab->elf.splt)
4689 {
4690 got_offset = h->plt.offset / plt_entry_size - 1;
4691 got_offset = (got_offset + 3) * 4;
4692 }
4693 else
4694 {
4695 got_offset = h->plt.offset / plt_entry_size;
4696 got_offset = got_offset * 4;
4697 }
4698
4699 /* Fill in the entry in the procedure linkage table. */
4700 if (! info->shared)
4701 {
4702 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4703 abed->plt->plt_entry_size);
4704 bfd_put_32 (output_bfd,
4705 (gotplt->output_section->vma
4706 + gotplt->output_offset
4707 + got_offset),
4708 plt->contents + h->plt.offset
4709 + abed->plt->plt_got_offset);
4710
4711 if (abed->is_vxworks)
4712 {
4713 int s, k, reloc_index;
4714
4715 /* Create the R_386_32 relocation referencing the GOT
4716 for this PLT entry. */
4717
4718 /* S: Current slot number (zero-based). */
4719 s = ((h->plt.offset - abed->plt->plt_entry_size)
4720 / abed->plt->plt_entry_size);
4721 /* K: Number of relocations for PLTResolve. */
4722 if (info->shared)
4723 k = PLTRESOLVE_RELOCS_SHLIB;
4724 else
4725 k = PLTRESOLVE_RELOCS;
4726 /* Skip the PLTresolve relocations, and the relocations for
4727 the other PLT slots. */
4728 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4729 loc = (htab->srelplt2->contents + reloc_index
4730 * sizeof (Elf32_External_Rel));
4731
4732 rel.r_offset = (htab->elf.splt->output_section->vma
4733 + htab->elf.splt->output_offset
4734 + h->plt.offset + 2),
4735 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4736 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4737
4738 /* Create the R_386_32 relocation referencing the beginning of
4739 the PLT for this GOT entry. */
4740 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4741 + htab->elf.sgotplt->output_offset
4742 + got_offset);
4743 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4744 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4745 loc + sizeof (Elf32_External_Rel));
4746 }
4747 }
4748 else
4749 {
4750 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4751 abed->plt->plt_entry_size);
4752 bfd_put_32 (output_bfd, got_offset,
4753 plt->contents + h->plt.offset
4754 + abed->plt->plt_got_offset);
4755 }
4756
4757 /* Fill in the entry in the global offset table. */
4758 bfd_put_32 (output_bfd,
4759 (plt->output_section->vma
4760 + plt->output_offset
4761 + h->plt.offset
4762 + abed->plt->plt_lazy_offset),
4763 gotplt->contents + got_offset);
4764
4765 /* Fill in the entry in the .rel.plt section. */
4766 rel.r_offset = (gotplt->output_section->vma
4767 + gotplt->output_offset
4768 + got_offset);
4769 if (h->dynindx == -1
4770 || ((info->executable
4771 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4772 && h->def_regular
4773 && h->type == STT_GNU_IFUNC))
4774 {
4775 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4776 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4777 in the .got.plt section. */
4778 bfd_put_32 (output_bfd,
4779 (h->root.u.def.value
4780 + h->root.u.def.section->output_section->vma
4781 + h->root.u.def.section->output_offset),
4782 gotplt->contents + got_offset);
4783 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4784 /* R_386_IRELATIVE comes last. */
4785 plt_index = htab->next_irelative_index--;
4786 }
4787 else
4788 {
4789 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4790 plt_index = htab->next_jump_slot_index++;
4791 }
4792 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4793 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4794
4795 /* Don't fill PLT entry for static executables. */
4796 if (plt == htab->elf.splt)
4797 {
4798 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4799 plt->contents + h->plt.offset
4800 + abed->plt->plt_reloc_offset);
4801 bfd_put_32 (output_bfd, - (h->plt.offset
4802 + abed->plt->plt_plt_offset + 4),
4803 plt->contents + h->plt.offset
4804 + abed->plt->plt_plt_offset);
4805 }
4806 }
4807 else if (eh->plt_got.offset != (bfd_vma) -1)
4808 {
4809 bfd_vma got_offset, plt_offset;
4810 asection *plt, *got, *gotplt;
4811 const bfd_byte *got_plt_entry;
4812
4813 /* Offset of displacement of the indirect jump. */
4814 bfd_vma plt_got_offset = 2;
4815
4816 /* Set the entry in the GOT procedure linkage table. */
4817 plt = htab->plt_got;
4818 got = htab->elf.sgot;
4819 gotplt = htab->elf.sgotplt;
4820 got_offset = h->got.offset;
4821
4822 if (got_offset == (bfd_vma) -1
4823 || plt == NULL
4824 || got == NULL
4825 || gotplt == NULL)
4826 abort ();
4827
4828 /* Fill in the entry in the GOT procedure linkage table. */
4829 if (! info->shared)
4830 {
4831 got_plt_entry = elf_i386_got_plt_entry;
4832 got_offset += got->output_section->vma + got->output_offset;
4833 }
4834 else
4835 {
4836 got_plt_entry = elf_i386_pic_got_plt_entry;
4837 got_offset += (got->output_section->vma
4838 + got->output_offset
4839 - gotplt->output_section->vma
4840 - gotplt->output_offset);
4841 }
4842
4843 plt_offset = eh->plt_got.offset;
4844 memcpy (plt->contents + plt_offset, got_plt_entry,
4845 sizeof (elf_i386_got_plt_entry));
4846 bfd_put_32 (output_bfd, got_offset,
4847 plt->contents + plt_offset + plt_got_offset);
4848 }
4849
4850 if (!h->def_regular
4851 && (h->plt.offset != (bfd_vma) -1
4852 || eh->plt_got.offset != (bfd_vma) -1))
4853 {
4854 /* Mark the symbol as undefined, rather than as defined in
4855 the .plt section. Leave the value if there were any
4856 relocations where pointer equality matters (this is a clue
4857 for the dynamic linker, to make function pointer
4858 comparisons work between an application and shared
4859 library), otherwise set it to zero. If a function is only
4860 called from a binary, there is no need to slow down
4861 shared libraries because of that. */
4862 sym->st_shndx = SHN_UNDEF;
4863 if (!h->pointer_equality_needed)
4864 sym->st_value = 0;
4865 }
4866
4867 if (h->got.offset != (bfd_vma) -1
4868 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4869 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4870 {
4871 Elf_Internal_Rela rel;
4872
4873 /* This symbol has an entry in the global offset table. Set it
4874 up. */
4875
4876 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4877 abort ();
4878
4879 rel.r_offset = (htab->elf.sgot->output_section->vma
4880 + htab->elf.sgot->output_offset
4881 + (h->got.offset & ~(bfd_vma) 1));
4882
4883 /* If this is a static link, or it is a -Bsymbolic link and the
4884 symbol is defined locally or was forced to be local because
4885 of a version file, we just want to emit a RELATIVE reloc.
4886 The entry in the global offset table will already have been
4887 initialized in the relocate_section function. */
4888 if (h->def_regular
4889 && h->type == STT_GNU_IFUNC)
4890 {
4891 if (info->shared)
4892 {
4893 /* Generate R_386_GLOB_DAT. */
4894 goto do_glob_dat;
4895 }
4896 else
4897 {
4898 asection *plt;
4899
4900 if (!h->pointer_equality_needed)
4901 abort ();
4902
4903 /* For non-shared object, we can't use .got.plt, which
4904 contains the real function addres if we need pointer
4905 equality. We load the GOT entry with the PLT entry. */
4906 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4907 bfd_put_32 (output_bfd,
4908 (plt->output_section->vma
4909 + plt->output_offset + h->plt.offset),
4910 htab->elf.sgot->contents + h->got.offset);
4911 return TRUE;
4912 }
4913 }
4914 else if (info->shared
4915 && SYMBOL_REFERENCES_LOCAL (info, h))
4916 {
4917 BFD_ASSERT((h->got.offset & 1) != 0);
4918 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4919 }
4920 else
4921 {
4922 BFD_ASSERT((h->got.offset & 1) == 0);
4923 do_glob_dat:
4924 bfd_put_32 (output_bfd, (bfd_vma) 0,
4925 htab->elf.sgot->contents + h->got.offset);
4926 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4927 }
4928
4929 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4930 }
4931
4932 if (h->needs_copy)
4933 {
4934 Elf_Internal_Rela rel;
4935
4936 /* This symbol needs a copy reloc. Set it up. */
4937
4938 if (h->dynindx == -1
4939 || (h->root.type != bfd_link_hash_defined
4940 && h->root.type != bfd_link_hash_defweak)
4941 || htab->srelbss == NULL)
4942 abort ();
4943
4944 rel.r_offset = (h->root.u.def.value
4945 + h->root.u.def.section->output_section->vma
4946 + h->root.u.def.section->output_offset);
4947 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4948 elf_append_rel (output_bfd, htab->srelbss, &rel);
4949 }
4950
4951 return TRUE;
4952 }
4953
4954 /* Finish up local dynamic symbol handling. We set the contents of
4955 various dynamic sections here. */
4956
4957 static bfd_boolean
4958 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4959 {
4960 struct elf_link_hash_entry *h
4961 = (struct elf_link_hash_entry *) *slot;
4962 struct bfd_link_info *info
4963 = (struct bfd_link_info *) inf;
4964
4965 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4966 h, NULL);
4967 }
4968
4969 /* Used to decide how to sort relocs in an optimal manner for the
4970 dynamic linker, before writing them out. */
4971
4972 static enum elf_reloc_type_class
4973 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4974 const asection *rel_sec ATTRIBUTE_UNUSED,
4975 const Elf_Internal_Rela *rela)
4976 {
4977 switch (ELF32_R_TYPE (rela->r_info))
4978 {
4979 case R_386_RELATIVE:
4980 return reloc_class_relative;
4981 case R_386_JUMP_SLOT:
4982 return reloc_class_plt;
4983 case R_386_COPY:
4984 return reloc_class_copy;
4985 default:
4986 return reloc_class_normal;
4987 }
4988 }
4989
4990 /* Finish up the dynamic sections. */
4991
4992 static bfd_boolean
4993 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4994 struct bfd_link_info *info)
4995 {
4996 struct elf_i386_link_hash_table *htab;
4997 bfd *dynobj;
4998 asection *sdyn;
4999 const struct elf_i386_backend_data *abed;
5000
5001 htab = elf_i386_hash_table (info);
5002 if (htab == NULL)
5003 return FALSE;
5004
5005 dynobj = htab->elf.dynobj;
5006 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5007 abed = get_elf_i386_backend_data (output_bfd);
5008
5009 if (htab->elf.dynamic_sections_created)
5010 {
5011 Elf32_External_Dyn *dyncon, *dynconend;
5012
5013 if (sdyn == NULL || htab->elf.sgot == NULL)
5014 abort ();
5015
5016 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5017 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5018 for (; dyncon < dynconend; dyncon++)
5019 {
5020 Elf_Internal_Dyn dyn;
5021 asection *s;
5022
5023 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5024
5025 switch (dyn.d_tag)
5026 {
5027 default:
5028 if (abed->is_vxworks
5029 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5030 break;
5031 continue;
5032
5033 case DT_PLTGOT:
5034 s = htab->elf.sgotplt;
5035 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5036 break;
5037
5038 case DT_JMPREL:
5039 s = htab->elf.srelplt;
5040 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5041 break;
5042
5043 case DT_PLTRELSZ:
5044 s = htab->elf.srelplt;
5045 dyn.d_un.d_val = s->size;
5046 break;
5047
5048 case DT_RELSZ:
5049 /* My reading of the SVR4 ABI indicates that the
5050 procedure linkage table relocs (DT_JMPREL) should be
5051 included in the overall relocs (DT_REL). This is
5052 what Solaris does. However, UnixWare can not handle
5053 that case. Therefore, we override the DT_RELSZ entry
5054 here to make it not include the JMPREL relocs. */
5055 s = htab->elf.srelplt;
5056 if (s == NULL)
5057 continue;
5058 dyn.d_un.d_val -= s->size;
5059 break;
5060
5061 case DT_REL:
5062 /* We may not be using the standard ELF linker script.
5063 If .rel.plt is the first .rel section, we adjust
5064 DT_REL to not include it. */
5065 s = htab->elf.srelplt;
5066 if (s == NULL)
5067 continue;
5068 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5069 continue;
5070 dyn.d_un.d_ptr += s->size;
5071 break;
5072 }
5073
5074 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5075 }
5076
5077 /* Fill in the first entry in the procedure linkage table. */
5078 if (htab->elf.splt && htab->elf.splt->size > 0)
5079 {
5080 if (info->shared)
5081 {
5082 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5083 abed->plt->plt0_entry_size);
5084 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5085 abed->plt0_pad_byte,
5086 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5087 }
5088 else
5089 {
5090 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5091 abed->plt->plt0_entry_size);
5092 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5093 abed->plt0_pad_byte,
5094 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5095 bfd_put_32 (output_bfd,
5096 (htab->elf.sgotplt->output_section->vma
5097 + htab->elf.sgotplt->output_offset
5098 + 4),
5099 htab->elf.splt->contents
5100 + abed->plt->plt0_got1_offset);
5101 bfd_put_32 (output_bfd,
5102 (htab->elf.sgotplt->output_section->vma
5103 + htab->elf.sgotplt->output_offset
5104 + 8),
5105 htab->elf.splt->contents
5106 + abed->plt->plt0_got2_offset);
5107
5108 if (abed->is_vxworks)
5109 {
5110 Elf_Internal_Rela rel;
5111
5112 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5113 On IA32 we use REL relocations so the addend goes in
5114 the PLT directly. */
5115 rel.r_offset = (htab->elf.splt->output_section->vma
5116 + htab->elf.splt->output_offset
5117 + abed->plt->plt0_got1_offset);
5118 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5119 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5120 htab->srelplt2->contents);
5121 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5122 rel.r_offset = (htab->elf.splt->output_section->vma
5123 + htab->elf.splt->output_offset
5124 + abed->plt->plt0_got2_offset);
5125 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5126 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5127 htab->srelplt2->contents +
5128 sizeof (Elf32_External_Rel));
5129 }
5130 }
5131
5132 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5133 really seem like the right value. */
5134 elf_section_data (htab->elf.splt->output_section)
5135 ->this_hdr.sh_entsize = 4;
5136
5137 /* Correct the .rel.plt.unloaded relocations. */
5138 if (abed->is_vxworks && !info->shared)
5139 {
5140 int num_plts = (htab->elf.splt->size
5141 / abed->plt->plt_entry_size) - 1;
5142 unsigned char *p;
5143
5144 p = htab->srelplt2->contents;
5145 if (info->shared)
5146 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5147 else
5148 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5149
5150 for (; num_plts; num_plts--)
5151 {
5152 Elf_Internal_Rela rel;
5153 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5154 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5155 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5156 p += sizeof (Elf32_External_Rel);
5157
5158 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5159 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5160 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5161 p += sizeof (Elf32_External_Rel);
5162 }
5163 }
5164 }
5165 }
5166
5167 if (htab->elf.sgotplt)
5168 {
5169 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5170 {
5171 (*_bfd_error_handler)
5172 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5173 return FALSE;
5174 }
5175
5176 /* Fill in the first three entries in the global offset table. */
5177 if (htab->elf.sgotplt->size > 0)
5178 {
5179 bfd_put_32 (output_bfd,
5180 (sdyn == NULL ? 0
5181 : sdyn->output_section->vma + sdyn->output_offset),
5182 htab->elf.sgotplt->contents);
5183 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5184 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5185 }
5186
5187 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5188 }
5189
5190 /* Adjust .eh_frame for .plt section. */
5191 if (htab->plt_eh_frame != NULL
5192 && htab->plt_eh_frame->contents != NULL)
5193 {
5194 if (htab->elf.splt != NULL
5195 && htab->elf.splt->size != 0
5196 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5197 && htab->elf.splt->output_section != NULL
5198 && htab->plt_eh_frame->output_section != NULL)
5199 {
5200 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5201 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5202 + htab->plt_eh_frame->output_offset
5203 + PLT_FDE_START_OFFSET;
5204 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5205 htab->plt_eh_frame->contents
5206 + PLT_FDE_START_OFFSET);
5207 }
5208 if (htab->plt_eh_frame->sec_info_type
5209 == SEC_INFO_TYPE_EH_FRAME)
5210 {
5211 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5212 htab->plt_eh_frame,
5213 htab->plt_eh_frame->contents))
5214 return FALSE;
5215 }
5216 }
5217
5218 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5219 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5220
5221 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5222 htab_traverse (htab->loc_hash_table,
5223 elf_i386_finish_local_dynamic_symbol,
5224 info);
5225
5226 return TRUE;
5227 }
5228
5229 /* Return an array of PLT entry symbol values. */
5230
5231 static bfd_vma *
5232 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5233 asection *relplt)
5234 {
5235 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5236 arelent *p;
5237 long count, i;
5238 bfd_vma *plt_sym_val;
5239 bfd_vma plt_offset;
5240 bfd_byte *plt_contents;
5241 const struct elf_i386_backend_data *bed
5242 = get_elf_i386_backend_data (abfd);
5243 Elf_Internal_Shdr *hdr;
5244
5245 /* Get the .plt section contents. */
5246 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5247 if (plt_contents == NULL)
5248 return NULL;
5249 if (!bfd_get_section_contents (abfd, (asection *) plt,
5250 plt_contents, 0, plt->size))
5251 {
5252 bad_return:
5253 free (plt_contents);
5254 return NULL;
5255 }
5256
5257 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5258 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5259 goto bad_return;
5260
5261 hdr = &elf_section_data (relplt)->this_hdr;
5262 count = relplt->size / hdr->sh_entsize;
5263
5264 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5265 if (plt_sym_val == NULL)
5266 goto bad_return;
5267
5268 for (i = 0; i < count; i++)
5269 plt_sym_val[i] = -1;
5270
5271 plt_offset = bed->plt->plt_entry_size;
5272 p = relplt->relocation;
5273 for (i = 0; i < count; i++, p++)
5274 {
5275 long reloc_index;
5276
5277 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5278 if (p->howto == NULL)
5279 continue;
5280
5281 if (p->howto->type != R_386_JUMP_SLOT
5282 && p->howto->type != R_386_IRELATIVE)
5283 continue;
5284
5285 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5286 + bed->plt->plt_reloc_offset));
5287 reloc_index /= sizeof (Elf32_External_Rel);
5288 if (reloc_index >= count)
5289 abort ();
5290 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5291 plt_offset += bed->plt->plt_entry_size;
5292
5293 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5294 section. */
5295 if (plt_offset >= plt->size)
5296 break;
5297 }
5298
5299 free (plt_contents);
5300
5301 return plt_sym_val;
5302 }
5303
5304 /* Similar to _bfd_elf_get_synthetic_symtab. */
5305
5306 static long
5307 elf_i386_get_synthetic_symtab (bfd *abfd,
5308 long symcount,
5309 asymbol **syms,
5310 long dynsymcount,
5311 asymbol **dynsyms,
5312 asymbol **ret)
5313 {
5314 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5315 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5316 dynsymcount, dynsyms, ret,
5317 plt,
5318 elf_i386_get_plt_sym_val);
5319 }
5320
5321 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5322
5323 static bfd_boolean
5324 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5325 {
5326 if (h->plt.offset != (bfd_vma) -1
5327 && !h->def_regular
5328 && !h->pointer_equality_needed)
5329 return FALSE;
5330
5331 return _bfd_elf_hash_symbol (h);
5332 }
5333
5334 /* Hook called by the linker routine which adds symbols from an object
5335 file. */
5336
5337 static bfd_boolean
5338 elf_i386_add_symbol_hook (bfd * abfd,
5339 struct bfd_link_info * info,
5340 Elf_Internal_Sym * sym,
5341 const char ** namep ATTRIBUTE_UNUSED,
5342 flagword * flagsp ATTRIBUTE_UNUSED,
5343 asection ** secp ATTRIBUTE_UNUSED,
5344 bfd_vma * valp ATTRIBUTE_UNUSED)
5345 {
5346 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5347 && (abfd->flags & DYNAMIC) == 0
5348 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5349 elf_tdata (info->output_bfd)->has_gnu_symbols
5350 |= elf_gnu_symbol_unique;
5351
5352 return TRUE;
5353 }
5354
5355 #define TARGET_LITTLE_SYM i386_elf32_vec
5356 #define TARGET_LITTLE_NAME "elf32-i386"
5357 #define ELF_ARCH bfd_arch_i386
5358 #define ELF_TARGET_ID I386_ELF_DATA
5359 #define ELF_MACHINE_CODE EM_386
5360 #define ELF_MAXPAGESIZE 0x1000
5361
5362 #define elf_backend_can_gc_sections 1
5363 #define elf_backend_can_refcount 1
5364 #define elf_backend_want_got_plt 1
5365 #define elf_backend_plt_readonly 1
5366 #define elf_backend_want_plt_sym 0
5367 #define elf_backend_got_header_size 12
5368 #define elf_backend_plt_alignment 4
5369 #define elf_backend_extern_protected_data 1
5370
5371 /* Support RELA for objdump of prelink objects. */
5372 #define elf_info_to_howto elf_i386_info_to_howto_rel
5373 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5374
5375 #define bfd_elf32_mkobject elf_i386_mkobject
5376
5377 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5378 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5379 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5380 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5381 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5382
5383 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5384 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5385 #define elf_backend_check_relocs elf_i386_check_relocs
5386 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5387 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5388 #define elf_backend_fake_sections elf_i386_fake_sections
5389 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5390 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5391 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5392 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5393 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5394 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5395 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5396 #define elf_backend_relocate_section elf_i386_relocate_section
5397 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5398 #define elf_backend_always_size_sections elf_i386_always_size_sections
5399 #define elf_backend_omit_section_dynsym \
5400 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5401 #define elf_backend_hash_symbol elf_i386_hash_symbol
5402 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5403
5404 #include "elf32-target.h"
5405
5406 /* FreeBSD support. */
5407
5408 #undef TARGET_LITTLE_SYM
5409 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5410 #undef TARGET_LITTLE_NAME
5411 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5412 #undef ELF_OSABI
5413 #define ELF_OSABI ELFOSABI_FREEBSD
5414
5415 /* The kernel recognizes executables as valid only if they carry a
5416 "FreeBSD" label in the ELF header. So we put this label on all
5417 executables and (for simplicity) also all other object files. */
5418
5419 static void
5420 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5421 {
5422 _bfd_elf_post_process_headers (abfd, info);
5423
5424 #ifdef OLD_FREEBSD_ABI_LABEL
5425 {
5426 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5427 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5428 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5429 }
5430 #endif
5431 }
5432
5433 #undef elf_backend_post_process_headers
5434 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5435 #undef elf32_bed
5436 #define elf32_bed elf32_i386_fbsd_bed
5437
5438 #undef elf_backend_add_symbol_hook
5439
5440 #include "elf32-target.h"
5441
5442 /* Solaris 2. */
5443
5444 #undef TARGET_LITTLE_SYM
5445 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5446 #undef TARGET_LITTLE_NAME
5447 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5448
5449 #undef elf_backend_post_process_headers
5450
5451 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5452 objects won't be recognized. */
5453 #undef ELF_OSABI
5454
5455 #undef elf32_bed
5456 #define elf32_bed elf32_i386_sol2_bed
5457
5458 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5459 boundary. */
5460 #undef elf_backend_static_tls_alignment
5461 #define elf_backend_static_tls_alignment 8
5462
5463 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5464
5465 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5466 File, p.63. */
5467 #undef elf_backend_want_plt_sym
5468 #define elf_backend_want_plt_sym 1
5469
5470 #include "elf32-target.h"
5471
5472 /* Intel MCU support. */
5473
5474 static bfd_boolean
5475 elf32_iamcu_elf_object_p (bfd *abfd)
5476 {
5477 /* Set the right machine number for an IAMCU elf32 file. */
5478 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5479 return TRUE;
5480 }
5481
5482 #undef TARGET_LITTLE_SYM
5483 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5484 #undef TARGET_LITTLE_NAME
5485 #define TARGET_LITTLE_NAME "elf32-iamcu"
5486 #undef ELF_ARCH
5487 #define ELF_ARCH bfd_arch_iamcu
5488
5489 #undef ELF_MACHINE_CODE
5490 #define ELF_MACHINE_CODE EM_IAMCU
5491
5492 #undef ELF_OSABI
5493
5494 #undef elf32_bed
5495 #define elf32_bed elf32_iamcu_bed
5496
5497 #undef elf_backend_object_p
5498 #define elf_backend_object_p elf32_iamcu_elf_object_p
5499
5500 #undef elf_backend_static_tls_alignment
5501
5502 #undef elf_backend_want_plt_sym
5503 #define elf_backend_want_plt_sym 0
5504
5505 #include "elf32-target.h"
5506
5507 /* Restore defaults. */
5508 #undef ELF_ARCH
5509 #define ELF_ARCH bfd_arch_i386
5510 #undef ELF_MACHINE_CODE
5511 #define ELF_MACHINE_CODE EM_386
5512
5513 /* Native Client support. */
5514
5515 #undef TARGET_LITTLE_SYM
5516 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5517 #undef TARGET_LITTLE_NAME
5518 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5519 #undef elf32_bed
5520 #define elf32_bed elf32_i386_nacl_bed
5521
5522 #undef ELF_MAXPAGESIZE
5523 #define ELF_MAXPAGESIZE 0x10000
5524
5525 /* Restore defaults. */
5526 #undef ELF_OSABI
5527 #undef elf_backend_want_plt_sym
5528 #define elf_backend_want_plt_sym 0
5529 #undef elf_backend_post_process_headers
5530 #undef elf_backend_static_tls_alignment
5531
5532 /* NaCl uses substantially different PLT entries for the same effects. */
5533
5534 #undef elf_backend_plt_alignment
5535 #define elf_backend_plt_alignment 5
5536 #define NACL_PLT_ENTRY_SIZE 64
5537 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5538
5539 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5540 {
5541 0xff, 0x35, /* pushl contents of address */
5542 0, 0, 0, 0, /* replaced with address of .got + 4. */
5543 0x8b, 0x0d, /* movl contents of address, %ecx */
5544 0, 0, 0, 0, /* replaced with address of .got + 8. */
5545 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5546 0xff, 0xe1 /* jmp *%ecx */
5547 };
5548
5549 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5550 {
5551 0x8b, 0x0d, /* movl contents of address, %ecx */
5552 0, 0, 0, 0, /* replaced with GOT slot address. */
5553 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5554 0xff, 0xe1, /* jmp *%ecx */
5555
5556 /* Pad to the next 32-byte boundary with nop instructions. */
5557 0x90,
5558 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5559 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5560
5561 /* Lazy GOT entries point here (32-byte aligned). */
5562 0x68, /* pushl immediate */
5563 0, 0, 0, 0, /* replaced with reloc offset. */
5564 0xe9, /* jmp relative */
5565 0, 0, 0, 0, /* replaced with offset to .plt. */
5566
5567 /* Pad to the next 32-byte boundary with nop instructions. */
5568 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5569 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5570 0x90, 0x90
5571 };
5572
5573 static const bfd_byte
5574 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5575 {
5576 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5577 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5578 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5579 0xff, 0xe1, /* jmp *%ecx */
5580
5581 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5582 so pad to that size with nop instructions. */
5583 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5584 };
5585
5586 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5587 {
5588 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5589 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5590 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5591 0xff, 0xe1, /* jmp *%ecx */
5592
5593 /* Pad to the next 32-byte boundary with nop instructions. */
5594 0x90,
5595 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5596 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5597
5598 /* Lazy GOT entries point here (32-byte aligned). */
5599 0x68, /* pushl immediate */
5600 0, 0, 0, 0, /* replaced with offset into relocation table. */
5601 0xe9, /* jmp relative */
5602 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5603
5604 /* Pad to the next 32-byte boundary with nop instructions. */
5605 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5606 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5607 0x90, 0x90
5608 };
5609
5610 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5611 {
5612 #if (PLT_CIE_LENGTH != 20 \
5613 || PLT_FDE_LENGTH != 36 \
5614 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5615 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5616 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5617 #endif
5618 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5619 0, 0, 0, 0, /* CIE ID */
5620 1, /* CIE version */
5621 'z', 'R', 0, /* Augmentation string */
5622 1, /* Code alignment factor */
5623 0x7c, /* Data alignment factor: -4 */
5624 8, /* Return address column */
5625 1, /* Augmentation size */
5626 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5627 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5628 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5629 DW_CFA_nop, DW_CFA_nop,
5630
5631 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5632 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5633 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5634 0, 0, 0, 0, /* .plt size goes here */
5635 0, /* Augmentation size */
5636 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5637 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5638 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5639 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5640 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5641 13, /* Block length */
5642 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5643 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5644 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5645 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5646 DW_CFA_nop, DW_CFA_nop
5647 };
5648
5649 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5650 {
5651 elf_i386_nacl_plt0_entry, /* plt0_entry */
5652 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5653 2, /* plt0_got1_offset */
5654 8, /* plt0_got2_offset */
5655 elf_i386_nacl_plt_entry, /* plt_entry */
5656 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5657 2, /* plt_got_offset */
5658 33, /* plt_reloc_offset */
5659 38, /* plt_plt_offset */
5660 32, /* plt_lazy_offset */
5661 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5662 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5663 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5664 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5665 };
5666
5667 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5668 {
5669 &elf_i386_nacl_plt, /* plt */
5670 0x90, /* plt0_pad_byte: nop insn */
5671 0, /* is_vxworks */
5672 };
5673
5674 static bfd_boolean
5675 elf32_i386_nacl_elf_object_p (bfd *abfd)
5676 {
5677 /* Set the right machine number for a NaCl i386 ELF32 file. */
5678 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5679 return TRUE;
5680 }
5681
5682 #undef elf_backend_arch_data
5683 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5684
5685 #undef elf_backend_object_p
5686 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5687 #undef elf_backend_modify_segment_map
5688 #define elf_backend_modify_segment_map nacl_modify_segment_map
5689 #undef elf_backend_modify_program_headers
5690 #define elf_backend_modify_program_headers nacl_modify_program_headers
5691 #undef elf_backend_final_write_processing
5692 #define elf_backend_final_write_processing nacl_final_write_processing
5693
5694 #include "elf32-target.h"
5695
5696 /* Restore defaults. */
5697 #undef elf_backend_object_p
5698 #undef elf_backend_modify_segment_map
5699 #undef elf_backend_modify_program_headers
5700 #undef elf_backend_final_write_processing
5701
5702 /* VxWorks support. */
5703
5704 #undef TARGET_LITTLE_SYM
5705 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5706 #undef TARGET_LITTLE_NAME
5707 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5708 #undef ELF_OSABI
5709 #undef elf_backend_plt_alignment
5710 #define elf_backend_plt_alignment 4
5711
5712 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5713 {
5714 &elf_i386_plt, /* plt */
5715 0x90, /* plt0_pad_byte */
5716 1, /* is_vxworks */
5717 };
5718
5719 #undef elf_backend_arch_data
5720 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5721
5722 #undef elf_backend_relocs_compatible
5723 #undef elf_backend_add_symbol_hook
5724 #define elf_backend_add_symbol_hook \
5725 elf_vxworks_add_symbol_hook
5726 #undef elf_backend_link_output_symbol_hook
5727 #define elf_backend_link_output_symbol_hook \
5728 elf_vxworks_link_output_symbol_hook
5729 #undef elf_backend_emit_relocs
5730 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5731 #undef elf_backend_final_write_processing
5732 #define elf_backend_final_write_processing \
5733 elf_vxworks_final_write_processing
5734 #undef elf_backend_static_tls_alignment
5735
5736 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5737 define it. */
5738 #undef elf_backend_want_plt_sym
5739 #define elf_backend_want_plt_sym 1
5740
5741 #undef elf32_bed
5742 #define elf32_bed elf32_i386_vxworks_bed
5743
5744 #include "elf32-target.h"
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