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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 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 "elfxx-x86.h"
22 #include "elf-nacl.h"
23 #include "elf-vxworks.h"
24 #include "dwarf2.h"
25 #include "opcode/i386.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #ifdef DEBUG_GEN_RELOC
186 #define TRACE(str) \
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
188 #else
189 #define TRACE(str)
190 #endif
191
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
195 {
196 switch (code)
197 {
198 case BFD_RELOC_NONE:
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
201
202 case BFD_RELOC_32:
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
205
206 case BFD_RELOC_CTOR:
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
213
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
217
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
221
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
225
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
229
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
233
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
237
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
241
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
245
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
250
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
270
271 case BFD_RELOC_16:
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
274
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
278
279 case BFD_RELOC_8:
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
282
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
286
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
291
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_SIZE32:
313 TRACE ("BFD_RELOC_SIZE32");
314 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
315
316 case BFD_RELOC_386_TLS_GOTDESC:
317 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
318 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_DESC_CALL:
321 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
322 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
323
324 case BFD_RELOC_386_TLS_DESC:
325 TRACE ("BFD_RELOC_386_TLS_DESC");
326 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
327
328 case BFD_RELOC_386_IRELATIVE:
329 TRACE ("BFD_RELOC_386_IRELATIVE");
330 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
331
332 case BFD_RELOC_386_GOT32X:
333 TRACE ("BFD_RELOC_386_GOT32X");
334 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
335
336 case BFD_RELOC_VTABLE_INHERIT:
337 TRACE ("BFD_RELOC_VTABLE_INHERIT");
338 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
339
340 case BFD_RELOC_VTABLE_ENTRY:
341 TRACE ("BFD_RELOC_VTABLE_ENTRY");
342 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
343
344 default:
345 break;
346 }
347
348 TRACE ("Unknown");
349 return 0;
350 }
351
352 static reloc_howto_type *
353 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
354 const char *r_name)
355 {
356 unsigned int i;
357
358 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
359 if (elf_howto_table[i].name != NULL
360 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
361 return &elf_howto_table[i];
362
363 return NULL;
364 }
365
366 static reloc_howto_type *
367 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
368 {
369 unsigned int indx;
370
371 if ((indx = r_type) >= R_386_standard
372 && ((indx = r_type - R_386_ext_offset) - R_386_standard
373 >= R_386_ext - R_386_standard)
374 && ((indx = r_type - R_386_tls_offset) - R_386_ext
375 >= R_386_ext2 - R_386_ext)
376 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
377 >= R_386_vt - R_386_ext2))
378 {
379 /* xgettext:c-format */
380 _bfd_error_handler (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table [indx].type != r_type)
386 return NULL;
387 return &elf_howto_table[indx];
388 }
389
390 static void
391 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
392 arelent *cache_ptr,
393 Elf_Internal_Rela *dst)
394 {
395 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
396 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
397 }
398
399 /* Return whether a symbol name implies a local label. The UnixWare
400 2.1 cc generates temporary symbols that start with .X, so we
401 recognize them here. FIXME: do other SVR4 compilers also use .X?.
402 If so, we should move the .X recognition into
403 _bfd_elf_is_local_label_name. */
404
405 static bfd_boolean
406 elf_i386_is_local_label_name (bfd *abfd, const char *name)
407 {
408 if (name[0] == '.' && name[1] == 'X')
409 return TRUE;
410
411 return _bfd_elf_is_local_label_name (abfd, name);
412 }
413 \f
414 /* Support for core dump NOTE sections. */
415
416 static bfd_boolean
417 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
418 {
419 int offset;
420 size_t size;
421
422 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
423 {
424 int pr_version = bfd_get_32 (abfd, note->descdata);
425
426 if (pr_version != 1)
427 return FALSE;
428
429 /* pr_cursig */
430 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
431
432 /* pr_pid */
433 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
434
435 /* pr_reg */
436 offset = 28;
437 size = bfd_get_32 (abfd, note->descdata + 8);
438 }
439 else
440 {
441 switch (note->descsz)
442 {
443 default:
444 return FALSE;
445
446 case 144: /* Linux/i386 */
447 /* pr_cursig */
448 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
449
450 /* pr_pid */
451 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
452
453 /* pr_reg */
454 offset = 72;
455 size = 68;
456
457 break;
458 }
459 }
460
461 /* Make a ".reg/999" section. */
462 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
463 size, note->descpos + offset);
464 }
465
466 static bfd_boolean
467 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
468 {
469 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
470 {
471 int pr_version = bfd_get_32 (abfd, note->descdata);
472
473 if (pr_version != 1)
474 return FALSE;
475
476 elf_tdata (abfd)->core->program
477 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
478 elf_tdata (abfd)->core->command
479 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
480 }
481 else
482 {
483 switch (note->descsz)
484 {
485 default:
486 return FALSE;
487
488 case 124: /* Linux/i386 elf_prpsinfo. */
489 elf_tdata (abfd)->core->pid
490 = bfd_get_32 (abfd, note->descdata + 12);
491 elf_tdata (abfd)->core->program
492 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
493 elf_tdata (abfd)->core->command
494 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
495 }
496 }
497
498 /* Note that for some reason, a spurious space is tacked
499 onto the end of the args in some (at least one anyway)
500 implementations, so strip it off if it exists. */
501 {
502 char *command = elf_tdata (abfd)->core->command;
503 int n = strlen (command);
504
505 if (0 < n && command[n - 1] == ' ')
506 command[n - 1] = '\0';
507 }
508
509 return TRUE;
510 }
511 \f
512 /* Functions for the i386 ELF linker.
513
514 In order to gain some understanding of code in this file without
515 knowing all the intricate details of the linker, note the
516 following:
517
518 Functions named elf_i386_* are called by external routines, other
519 functions are only called locally. elf_i386_* functions appear
520 in this file more or less in the order in which they are called
521 from external routines. eg. elf_i386_check_relocs is called
522 early in the link process, elf_i386_finish_dynamic_sections is
523 one of the last functions. */
524
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
526
527 #define LAZY_PLT_ENTRY_SIZE 16
528
529 /* The size in bytes of an entry in the non-lazy procedure linkage
530 table. */
531
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
533
534 /* The first entry in an absolute lazy procedure linkage table looks
535 like this. See the SVR4 ABI i386 supplement to see how this works.
536 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
537
538 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
539 {
540 0xff, 0x35, /* pushl contents of address */
541 0, 0, 0, 0, /* replaced with address of .got + 4. */
542 0xff, 0x25, /* jmp indirect */
543 0, 0, 0, 0 /* replaced with address of .got + 8. */
544 };
545
546 /* Subsequent entries in an absolute lazy procedure linkage table look
547 like this. */
548
549 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
550 {
551 0xff, 0x25, /* jmp indirect */
552 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
553 0x68, /* pushl immediate */
554 0, 0, 0, 0, /* replaced with offset into relocation table. */
555 0xe9, /* jmp relative */
556 0, 0, 0, 0 /* replaced with offset to start of .plt. */
557 };
558
559 /* The first entry in a PIC lazy procedure linkage table look like
560 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
561 lazy_plt->plt0_pad_byte. */
562
563 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
564 {
565 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
566 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
567 };
568
569 /* Subsequent entries in a PIC lazy procedure linkage table look like
570 this. */
571
572 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
573 {
574 0xff, 0xa3, /* jmp *offset(%ebx) */
575 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
576 0x68, /* pushl immediate */
577 0, 0, 0, 0, /* replaced with offset into relocation table. */
578 0xe9, /* jmp relative */
579 0, 0, 0, 0 /* replaced with offset to start of .plt. */
580 };
581
582 /* Entries in the non-lazy procedure linkage table look like this. */
583
584 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
585 {
586 0xff, 0x25, /* jmp indirect */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x66, 0x90 /* xchg %ax,%ax */
589 };
590
591 /* Entries in the PIC non-lazy procedure linkage table look like
592 this. */
593
594 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
595 {
596 0xff, 0xa3, /* jmp *offset(%ebx) */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
599 };
600
601 /* The first entry in an absolute IBT-enabled lazy procedure linkage
602 table looks like this. */
603
604 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
605 {
606 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
607 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
608 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
609 };
610
611 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
612 table look like this. Subsequent entries for a PIC IBT-enabled lazy
613 procedure linkage table are the same. */
614
615 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
616 {
617 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
618 0x68, 0, 0, 0, 0, /* pushl immediate */
619 0xe9, 0, 0, 0, 0, /* jmp relative */
620 0x66, 0x90 /* xchg %ax,%ax */
621 };
622
623 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
624 look like. */
625
626 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
627 {
628 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
629 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
630 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
631 };
632
633 /* Entries for branches with IBT-enabled in the absolute non-lazey
634 procedure linkage table look like this. They have the same size
635 as the lazy PLT entry. */
636
637 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
638 {
639 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
640 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
641 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
642 };
643
644 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
646 PLT entry. */
647
648 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
649 {
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
653 };
654
655 /* .eh_frame covering the lazy .plt section. */
656
657 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
658 {
659 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
660 0, 0, 0, 0, /* CIE ID */
661 1, /* CIE version */
662 'z', 'R', 0, /* Augmentation string */
663 1, /* Code alignment factor */
664 0x7c, /* Data alignment factor */
665 8, /* Return address column */
666 1, /* Augmentation size */
667 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
668 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
669 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
670 DW_CFA_nop, DW_CFA_nop,
671
672 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
673 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
674 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
675 0, 0, 0, 0, /* .plt size goes here */
676 0, /* Augmentation size */
677 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
678 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
679 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
680 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
681 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
682 11, /* Block length */
683 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
684 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
685 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
686 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
687 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
688 };
689
690 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
691
692 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
693 {
694 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
695 0, 0, 0, 0, /* CIE ID */
696 1, /* CIE version */
697 'z', 'R', 0, /* Augmentation string */
698 1, /* Code alignment factor */
699 0x7c, /* Data alignment factor */
700 8, /* Return address column */
701 1, /* Augmentation size */
702 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
703 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
704 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
705 DW_CFA_nop, DW_CFA_nop,
706
707 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
708 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
709 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
710 0, 0, 0, 0, /* .plt size goes here */
711 0, /* Augmentation size */
712 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
713 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
714 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
715 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
716 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
717 11, /* Block length */
718 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
719 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
720 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
721 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
722 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
723 };
724
725 /* .eh_frame covering the non-lazy .plt section. */
726
727 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
728 {
729 #define PLT_GOT_FDE_LENGTH 16
730 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
731 0, 0, 0, 0, /* CIE ID */
732 1, /* CIE version */
733 'z', 'R', 0, /* Augmentation string */
734 1, /* Code alignment factor */
735 0x7c, /* Data alignment factor */
736 8, /* Return address column */
737 1, /* Augmentation size */
738 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
739 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
740 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
741 DW_CFA_nop, DW_CFA_nop,
742
743 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
744 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
745 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
746 0, 0, 0, 0, /* non-lazy .plt size goes here */
747 0, /* Augmentation size */
748 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
749 };
750
751 /* These are the standard parameters. */
752 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
753 {
754 elf_i386_lazy_plt0_entry, /* plt0_entry */
755 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
756 elf_i386_lazy_plt_entry, /* plt_entry */
757 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
758 2, /* plt0_got1_offset */
759 8, /* plt0_got2_offset */
760 0, /* plt0_got2_insn_end */
761 2, /* plt_got_offset */
762 7, /* plt_reloc_offset */
763 12, /* plt_plt_offset */
764 0, /* plt_got_insn_size */
765 0, /* plt_plt_insn_end */
766 6, /* plt_lazy_offset */
767 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
768 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
769 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
770 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
771 };
772
773 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
774 {
775 elf_i386_non_lazy_plt_entry, /* plt_entry */
776 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
777 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
778 2, /* plt_got_offset */
779 0, /* plt_got_insn_size */
780 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
781 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
782 };
783
784 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
785 {
786 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
787 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
788 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
789 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
790 2, /* plt0_got1_offset */
791 8, /* plt0_got2_offset */
792 0, /* plt0_got2_insn_end */
793 4+2, /* plt_got_offset */
794 4+1, /* plt_reloc_offset */
795 4+6, /* plt_plt_offset */
796 0, /* plt_got_insn_size */
797 0, /* plt_plt_insn_end */
798 0, /* plt_lazy_offset */
799 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
800 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
801 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
802 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
803 };
804
805 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
806 {
807 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
808 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
809 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
810 4+2, /* plt_got_offset */
811 0, /* plt_got_insn_size */
812 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
813 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
814 };
815 \f
816
817 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
818 for the PLTResolve stub and then for each PLT entry. */
819 #define PLTRESOLVE_RELOCS_SHLIB 0
820 #define PLTRESOLVE_RELOCS 2
821 #define PLT_NON_JUMP_SLOT_RELOCS 2
822
823 /* Architecture-specific backend data for i386. */
824
825 struct elf_i386_backend_data
826 {
827 /* Value used to fill the unused bytes of the first PLT entry. */
828 bfd_byte plt0_pad_byte;
829
830 /* Target system. */
831 enum
832 {
833 is_normal,
834 is_vxworks,
835 is_nacl
836 } os;
837 };
838
839 #define get_elf_i386_backend_data(abfd) \
840 ((const struct elf_i386_backend_data *) \
841 get_elf_backend_data (abfd)->arch_data)
842
843 /* These are the standard parameters. */
844 static const struct elf_i386_backend_data elf_i386_arch_bed =
845 {
846 0, /* plt0_pad_byte */
847 is_normal /* os */
848 };
849
850 #define elf_backend_arch_data &elf_i386_arch_bed
851
852 /* Return TRUE if the TLS access code sequence support transition
853 from R_TYPE. */
854
855 static bfd_boolean
856 elf_i386_check_tls_transition (asection *sec,
857 bfd_byte *contents,
858 Elf_Internal_Shdr *symtab_hdr,
859 struct elf_link_hash_entry **sym_hashes,
860 unsigned int r_type,
861 const Elf_Internal_Rela *rel,
862 const Elf_Internal_Rela *relend)
863 {
864 unsigned int val, type, reg;
865 unsigned long r_symndx;
866 struct elf_link_hash_entry *h;
867 bfd_vma offset;
868 bfd_byte *call;
869 bfd_boolean indirect_call;
870
871 offset = rel->r_offset;
872 switch (r_type)
873 {
874 case R_386_TLS_GD:
875 case R_386_TLS_LDM:
876 if (offset < 2 || (rel + 1) >= relend)
877 return FALSE;
878
879 indirect_call = FALSE;
880 call = contents + offset + 4;
881 val = *(call - 5);
882 type = *(call - 6);
883 if (r_type == R_386_TLS_GD)
884 {
885 /* Check transition from GD access model. Only
886 leal foo@tlsgd(,%ebx,1), %eax
887 call ___tls_get_addr@PLT
888 or
889 leal foo@tlsgd(%ebx) %eax
890 call ___tls_get_addr@PLT
891 nop
892 or
893 leal foo@tlsgd(%reg), %eax
894 call *___tls_get_addr@GOT(%reg)
895 which may be converted to
896 addr32 call ___tls_get_addr
897 can transit to different access model. */
898 if ((offset + 10) > sec->size
899 || (type != 0x8d && type != 0x04))
900 return FALSE;
901
902 if (type == 0x04)
903 {
904 /* leal foo@tlsgd(,%ebx,1), %eax
905 call ___tls_get_addr@PLT */
906 if (offset < 3)
907 return FALSE;
908
909 if (*(call - 7) != 0x8d
910 || val != 0x1d
911 || call[0] != 0xe8)
912 return FALSE;
913 }
914 else
915 {
916 /* This must be
917 leal foo@tlsgd(%ebx), %eax
918 call ___tls_get_addr@PLT
919 nop
920 or
921 leal foo@tlsgd(%reg), %eax
922 call *___tls_get_addr@GOT(%reg)
923 which may be converted to
924 addr32 call ___tls_get_addr
925
926 %eax can't be used as the GOT base register since it
927 is used to pass parameter to ___tls_get_addr. */
928 reg = val & 7;
929 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
930 return FALSE;
931
932 indirect_call = call[0] == 0xff;
933 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
934 && !(call[0] == 0x67 && call[1] == 0xe8)
935 && !(indirect_call
936 && (call[1] & 0xf8) == 0x90
937 && (call[1] & 0x7) == reg))
938 return FALSE;
939 }
940 }
941 else
942 {
943 /* Check transition from LD access model. Only
944 leal foo@tlsldm(%ebx), %eax
945 call ___tls_get_addr@PLT
946 or
947 leal foo@tlsldm(%reg), %eax
948 call *___tls_get_addr@GOT(%reg)
949 which may be converted to
950 addr32 call ___tls_get_addr
951 can transit to different access model. */
952 if (type != 0x8d || (offset + 9) > sec->size)
953 return FALSE;
954
955 /* %eax can't be used as the GOT base register since it is
956 used to pass parameter to ___tls_get_addr. */
957 reg = val & 7;
958 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
959 return FALSE;
960
961 indirect_call = call[0] == 0xff;
962 if (!(reg == 3 && call[0] == 0xe8)
963 && !(call[0] == 0x67 && call[1] == 0xe8)
964 && !(indirect_call
965 && (call[1] & 0xf8) == 0x90
966 && (call[1] & 0x7) == reg))
967 return FALSE;
968 }
969
970 r_symndx = ELF32_R_SYM (rel[1].r_info);
971 if (r_symndx < symtab_hdr->sh_info)
972 return FALSE;
973
974 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
975 if (h == NULL
976 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
977 return FALSE;
978 else if (indirect_call)
979 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
980 else
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
982 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
983
984 case R_386_TLS_IE:
985 /* Check transition from IE access model:
986 movl foo@indntpoff(%rip), %eax
987 movl foo@indntpoff(%rip), %reg
988 addl foo@indntpoff(%rip), %reg
989 */
990
991 if (offset < 1 || (offset + 4) > sec->size)
992 return FALSE;
993
994 /* Check "movl foo@tpoff(%rip), %eax" first. */
995 val = bfd_get_8 (abfd, contents + offset - 1);
996 if (val == 0xa1)
997 return TRUE;
998
999 if (offset < 2)
1000 return FALSE;
1001
1002 /* Check movl|addl foo@tpoff(%rip), %reg. */
1003 type = bfd_get_8 (abfd, contents + offset - 2);
1004 return ((type == 0x8b || type == 0x03)
1005 && (val & 0xc7) == 0x05);
1006
1007 case R_386_TLS_GOTIE:
1008 case R_386_TLS_IE_32:
1009 /* Check transition from {IE_32,GOTIE} access model:
1010 subl foo@{tpoff,gontoff}(%reg1), %reg2
1011 movl foo@{tpoff,gontoff}(%reg1), %reg2
1012 addl foo@{tpoff,gontoff}(%reg1), %reg2
1013 */
1014
1015 if (offset < 2 || (offset + 4) > sec->size)
1016 return FALSE;
1017
1018 val = bfd_get_8 (abfd, contents + offset - 1);
1019 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1020 return FALSE;
1021
1022 type = bfd_get_8 (abfd, contents + offset - 2);
1023 return type == 0x8b || type == 0x2b || type == 0x03;
1024
1025 case R_386_TLS_GOTDESC:
1026 /* Check transition from GDesc access model:
1027 leal x@tlsdesc(%ebx), %eax
1028
1029 Make sure it's a leal adding ebx to a 32-bit offset
1030 into any register, although it's probably almost always
1031 going to be eax. */
1032
1033 if (offset < 2 || (offset + 4) > sec->size)
1034 return FALSE;
1035
1036 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1037 return FALSE;
1038
1039 val = bfd_get_8 (abfd, contents + offset - 1);
1040 return (val & 0xc7) == 0x83;
1041
1042 case R_386_TLS_DESC_CALL:
1043 /* Check transition from GDesc access model:
1044 call *x@tlsdesc(%eax)
1045 */
1046 if (offset + 2 <= sec->size)
1047 {
1048 /* Make sure that it's a call *x@tlsdesc(%eax). */
1049 call = contents + offset;
1050 return call[0] == 0xff && call[1] == 0x10;
1051 }
1052
1053 return FALSE;
1054
1055 default:
1056 abort ();
1057 }
1058 }
1059
1060 /* Return TRUE if the TLS access transition is OK or no transition
1061 will be performed. Update R_TYPE if there is a transition. */
1062
1063 static bfd_boolean
1064 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1065 asection *sec, bfd_byte *contents,
1066 Elf_Internal_Shdr *symtab_hdr,
1067 struct elf_link_hash_entry **sym_hashes,
1068 unsigned int *r_type, int tls_type,
1069 const Elf_Internal_Rela *rel,
1070 const Elf_Internal_Rela *relend,
1071 struct elf_link_hash_entry *h,
1072 unsigned long r_symndx,
1073 bfd_boolean from_relocate_section)
1074 {
1075 unsigned int from_type = *r_type;
1076 unsigned int to_type = from_type;
1077 bfd_boolean check = TRUE;
1078
1079 /* Skip TLS transition for functions. */
1080 if (h != NULL
1081 && (h->type == STT_FUNC
1082 || h->type == STT_GNU_IFUNC))
1083 return TRUE;
1084
1085 switch (from_type)
1086 {
1087 case R_386_TLS_GD:
1088 case R_386_TLS_GOTDESC:
1089 case R_386_TLS_DESC_CALL:
1090 case R_386_TLS_IE_32:
1091 case R_386_TLS_IE:
1092 case R_386_TLS_GOTIE:
1093 if (bfd_link_executable (info))
1094 {
1095 if (h == NULL)
1096 to_type = R_386_TLS_LE_32;
1097 else if (from_type != R_386_TLS_IE
1098 && from_type != R_386_TLS_GOTIE)
1099 to_type = R_386_TLS_IE_32;
1100 }
1101
1102 /* When we are called from elf_i386_relocate_section, there may
1103 be additional transitions based on TLS_TYPE. */
1104 if (from_relocate_section)
1105 {
1106 unsigned int new_to_type = to_type;
1107
1108 if (bfd_link_executable (info)
1109 && h != NULL
1110 && h->dynindx == -1
1111 && (tls_type & GOT_TLS_IE))
1112 new_to_type = R_386_TLS_LE_32;
1113
1114 if (to_type == R_386_TLS_GD
1115 || to_type == R_386_TLS_GOTDESC
1116 || to_type == R_386_TLS_DESC_CALL)
1117 {
1118 if (tls_type == GOT_TLS_IE_POS)
1119 new_to_type = R_386_TLS_GOTIE;
1120 else if (tls_type & GOT_TLS_IE)
1121 new_to_type = R_386_TLS_IE_32;
1122 }
1123
1124 /* We checked the transition before when we were called from
1125 elf_i386_check_relocs. We only want to check the new
1126 transition which hasn't been checked before. */
1127 check = new_to_type != to_type && from_type == to_type;
1128 to_type = new_to_type;
1129 }
1130
1131 break;
1132
1133 case R_386_TLS_LDM:
1134 if (bfd_link_executable (info))
1135 to_type = R_386_TLS_LE_32;
1136 break;
1137
1138 default:
1139 return TRUE;
1140 }
1141
1142 /* Return TRUE if there is no transition. */
1143 if (from_type == to_type)
1144 return TRUE;
1145
1146 /* Check if the transition can be performed. */
1147 if (check
1148 && ! elf_i386_check_tls_transition (sec, contents,
1149 symtab_hdr, sym_hashes,
1150 from_type, rel, relend))
1151 {
1152 reloc_howto_type *from, *to;
1153 const char *name;
1154
1155 from = elf_i386_rtype_to_howto (abfd, from_type);
1156 to = elf_i386_rtype_to_howto (abfd, to_type);
1157
1158 if (h)
1159 name = h->root.root.string;
1160 else
1161 {
1162 struct elf_x86_link_hash_table *htab;
1163
1164 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1165 if (htab == NULL)
1166 name = "*unknown*";
1167 else
1168 {
1169 Elf_Internal_Sym *isym;
1170
1171 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1172 abfd, r_symndx);
1173 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1174 }
1175 }
1176
1177 _bfd_error_handler
1178 /* xgettext:c-format */
1179 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1180 "in section `%A' failed"),
1181 abfd, from->name, to->name, name,
1182 rel->r_offset, sec);
1183 bfd_set_error (bfd_error_bad_value);
1184 return FALSE;
1185 }
1186
1187 *r_type = to_type;
1188 return TRUE;
1189 }
1190
1191 /* With the local symbol, foo, we convert
1192 mov foo@GOT[(%reg1)], %reg2
1193 to
1194 lea foo[@GOTOFF(%reg1)], %reg2
1195 and convert
1196 call/jmp *foo@GOT[(%reg)]
1197 to
1198 nop call foo/jmp foo nop
1199 When PIC is false, convert
1200 test %reg1, foo@GOT[(%reg2)]
1201 to
1202 test $foo, %reg1
1203 and convert
1204 binop foo@GOT[(%reg1)], %reg2
1205 to
1206 binop $foo, %reg2
1207 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1208 instructions. */
1209
1210 static
1211 bfd_boolean
1212 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1213 bfd_byte *contents,
1214 Elf_Internal_Rela *irel,
1215 struct elf_link_hash_entry *h,
1216 bfd_boolean *converted,
1217 struct bfd_link_info *link_info)
1218 {
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1221 unsigned int modrm;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1225 unsigned int nop;
1226 bfd_vma nop_offset;
1227 bfd_boolean is_pic;
1228 bfd_boolean to_reloc_32;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232
1233 if (roff < 2)
1234 return TRUE;
1235
1236 /* Addend for R_386_GOT32X relocations must be 0. */
1237 addend = bfd_get_32 (abfd, contents + roff);
1238 if (addend != 0)
1239 return TRUE;
1240
1241 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1242 is_pic = bfd_link_pic (link_info);
1243
1244 r_type = ELF32_R_TYPE (irel->r_info);
1245 r_symndx = ELF32_R_SYM (irel->r_info);
1246
1247 modrm = bfd_get_8 (abfd, contents + roff - 1);
1248 baseless = (modrm & 0xc7) == 0x5;
1249
1250 if (baseless && is_pic)
1251 {
1252 /* For PIC, disallow R_386_GOT32X without a base register
1253 since we don't know what the GOT base is. */
1254 const char *name;
1255
1256 if (h == NULL)
1257 {
1258 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1259 r_symndx);
1260 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1261 }
1262 else
1263 name = h->root.root.string;
1264
1265 _bfd_error_handler
1266 /* xgettext:c-format */
1267 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1268 " register can not be used when making a shared object"),
1269 abfd, name);
1270 return FALSE;
1271 }
1272
1273 opcode = bfd_get_8 (abfd, contents + roff - 2);
1274
1275 /* Convert to R_386_32 if PIC is false or there is no base
1276 register. */
1277 to_reloc_32 = !is_pic || baseless;
1278
1279 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1280 reloc. */
1281 if (h == NULL)
1282 {
1283 if (opcode == 0x0ff)
1284 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1285 goto convert_branch;
1286 else
1287 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1288 "test %reg1, foo@GOT(%reg2)" and
1289 "binop foo@GOT[(%reg1)], %reg2". */
1290 goto convert_load;
1291 }
1292
1293 /* Undefined weak symbol is only bound locally in executable
1294 and its reference is resolved as 0. */
1295 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, I386_ELF_DATA, TRUE,
1296 elf_x86_hash_entry (h)))
1297 {
1298 if (opcode == 0xff)
1299 {
1300 /* No direct branch to 0 for PIC. */
1301 if (is_pic)
1302 return TRUE;
1303 else
1304 goto convert_branch;
1305 }
1306 else
1307 {
1308 /* We can convert load of address 0 to R_386_32. */
1309 to_reloc_32 = TRUE;
1310 goto convert_load;
1311 }
1312 }
1313
1314 if (opcode == 0xff)
1315 {
1316 /* We have "call/jmp *foo@GOT[(%reg)]". */
1317 if ((h->root.type == bfd_link_hash_defined
1318 || h->root.type == bfd_link_hash_defweak)
1319 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1320 {
1321 /* The function is locally defined. */
1322 convert_branch:
1323 /* Convert R_386_GOT32X to R_386_PC32. */
1324 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1325 {
1326 struct elf_x86_link_hash_entry *eh
1327 = (struct elf_x86_link_hash_entry *) h;
1328
1329 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1330 is a nop prefix. */
1331 modrm = 0xe8;
1332 /* To support TLS optimization, always use addr32 prefix
1333 for "call *___tls_get_addr@GOT(%reg)". */
1334 if (eh && eh->tls_get_addr)
1335 {
1336 nop = 0x67;
1337 nop_offset = irel->r_offset - 2;
1338 }
1339 else
1340 {
1341 nop = link_info->call_nop_byte;
1342 if (link_info->call_nop_as_suffix)
1343 {
1344 nop_offset = roff + 3;
1345 irel->r_offset -= 1;
1346 }
1347 else
1348 nop_offset = roff - 2;
1349 }
1350 }
1351 else
1352 {
1353 /* Convert to "jmp foo nop". */
1354 modrm = 0xe9;
1355 nop = NOP_OPCODE;
1356 nop_offset = roff + 3;
1357 irel->r_offset -= 1;
1358 }
1359
1360 bfd_put_8 (abfd, nop, contents + nop_offset);
1361 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1362 /* When converting to PC-relative relocation, we
1363 need to adjust addend by -4. */
1364 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1365 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1366
1367 *converted = TRUE;
1368 }
1369 }
1370 else
1371 {
1372 /* We have "mov foo@GOT[(%re1g)], %reg2",
1373 "test %reg1, foo@GOT(%reg2)" and
1374 "binop foo@GOT[(%reg1)], %reg2".
1375
1376 Avoid optimizing _DYNAMIC since ld.so may use its
1377 link-time address. */
1378 if (h == htab->elf.hdynamic)
1379 return TRUE;
1380
1381 /* def_regular is set by an assignment in a linker script in
1382 bfd_elf_record_link_assignment. start_stop is set on
1383 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1384 if (h->start_stop
1385 || ((h->def_regular
1386 || h->root.type == bfd_link_hash_defined
1387 || h->root.type == bfd_link_hash_defweak)
1388 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
1389 {
1390 convert_load:
1391 if (opcode == 0x8b)
1392 {
1393 if (to_reloc_32)
1394 {
1395 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1396 "mov $foo, %reg2" with R_386_32. */
1397 r_type = R_386_32;
1398 modrm = 0xc0 | (modrm & 0x38) >> 3;
1399 bfd_put_8 (abfd, modrm, contents + roff - 1);
1400 opcode = 0xc7;
1401 }
1402 else
1403 {
1404 /* Convert "mov foo@GOT(%reg1), %reg2" to
1405 "lea foo@GOTOFF(%reg1), %reg2". */
1406 r_type = R_386_GOTOFF;
1407 opcode = 0x8d;
1408 }
1409 }
1410 else
1411 {
1412 /* Only R_386_32 is supported. */
1413 if (!to_reloc_32)
1414 return TRUE;
1415
1416 if (opcode == 0x85)
1417 {
1418 /* Convert "test %reg1, foo@GOT(%reg2)" to
1419 "test $foo, %reg1". */
1420 modrm = 0xc0 | (modrm & 0x38) >> 3;
1421 opcode = 0xf7;
1422 }
1423 else
1424 {
1425 /* Convert "binop foo@GOT(%reg1), %reg2" to
1426 "binop $foo, %reg2". */
1427 modrm = (0xc0
1428 | (modrm & 0x38) >> 3
1429 | (opcode & 0x3c));
1430 opcode = 0x81;
1431 }
1432 bfd_put_8 (abfd, modrm, contents + roff - 1);
1433 r_type = R_386_32;
1434 }
1435
1436 bfd_put_8 (abfd, opcode, contents + roff - 2);
1437 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1438
1439 *converted = TRUE;
1440 }
1441 }
1442
1443 return TRUE;
1444 }
1445
1446 /* Rename some of the generic section flags to better document how they
1447 are used here. */
1448 #define need_convert_load sec_flg0
1449 #define check_relocs_failed sec_flg1
1450
1451 /* Look through the relocs for a section during the first phase, and
1452 calculate needed space in the global offset table, procedure linkage
1453 table, and dynamic reloc sections. */
1454
1455 static bfd_boolean
1456 elf_i386_check_relocs (bfd *abfd,
1457 struct bfd_link_info *info,
1458 asection *sec,
1459 const Elf_Internal_Rela *relocs)
1460 {
1461 struct elf_x86_link_hash_table *htab;
1462 Elf_Internal_Shdr *symtab_hdr;
1463 struct elf_link_hash_entry **sym_hashes;
1464 const Elf_Internal_Rela *rel;
1465 const Elf_Internal_Rela *rel_end;
1466 asection *sreloc;
1467 bfd_byte *contents;
1468
1469 if (bfd_link_relocatable (info))
1470 return TRUE;
1471
1472 /* Don't do anything special with non-loaded, non-alloced sections.
1473 In particular, any relocs in such sections should not affect GOT
1474 and PLT reference counting (ie. we don't allow them to create GOT
1475 or PLT entries), there's no possibility or desire to optimize TLS
1476 relocs, and there's not much point in propagating relocs to shared
1477 libs that the dynamic linker won't relocate. */
1478 if ((sec->flags & SEC_ALLOC) == 0)
1479 return TRUE;
1480
1481 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1482 if (htab == NULL)
1483 {
1484 sec->check_relocs_failed = 1;
1485 return FALSE;
1486 }
1487
1488 BFD_ASSERT (is_x86_elf (abfd, htab));
1489
1490 /* Get the section contents. */
1491 if (elf_section_data (sec)->this_hdr.contents != NULL)
1492 contents = elf_section_data (sec)->this_hdr.contents;
1493 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1494 {
1495 sec->check_relocs_failed = 1;
1496 return FALSE;
1497 }
1498
1499 symtab_hdr = &elf_symtab_hdr (abfd);
1500 sym_hashes = elf_sym_hashes (abfd);
1501
1502 sreloc = NULL;
1503
1504 rel_end = relocs + sec->reloc_count;
1505 for (rel = relocs; rel < rel_end; rel++)
1506 {
1507 unsigned int r_type;
1508 unsigned int r_symndx;
1509 struct elf_link_hash_entry *h;
1510 struct elf_x86_link_hash_entry *eh;
1511 Elf_Internal_Sym *isym;
1512 const char *name;
1513 bfd_boolean size_reloc;
1514
1515 r_symndx = ELF32_R_SYM (rel->r_info);
1516 r_type = ELF32_R_TYPE (rel->r_info);
1517
1518 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1519 {
1520 /* xgettext:c-format */
1521 _bfd_error_handler (_("%B: bad symbol index: %d"),
1522 abfd, r_symndx);
1523 goto error_return;
1524 }
1525
1526 if (r_symndx < symtab_hdr->sh_info)
1527 {
1528 /* A local symbol. */
1529 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1530 abfd, r_symndx);
1531 if (isym == NULL)
1532 goto error_return;
1533
1534 /* Check relocation against local STT_GNU_IFUNC symbol. */
1535 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1536 {
1537 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1538 if (h == NULL)
1539 goto error_return;
1540
1541 /* Fake a STT_GNU_IFUNC symbol. */
1542 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1543 isym, NULL);
1544 h->type = STT_GNU_IFUNC;
1545 h->def_regular = 1;
1546 h->ref_regular = 1;
1547 h->forced_local = 1;
1548 h->root.type = bfd_link_hash_defined;
1549 }
1550 else
1551 h = NULL;
1552 }
1553 else
1554 {
1555 isym = NULL;
1556 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1557 while (h->root.type == bfd_link_hash_indirect
1558 || h->root.type == bfd_link_hash_warning)
1559 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1560 }
1561
1562 eh = (struct elf_x86_link_hash_entry *) h;
1563 if (h != NULL)
1564 {
1565 if (r_type == R_386_GOTOFF)
1566 eh->gotoff_ref = 1;
1567
1568 /* It is referenced by a non-shared object. */
1569 h->ref_regular = 1;
1570 h->root.non_ir_ref_regular = 1;
1571
1572 if (h->type == STT_GNU_IFUNC)
1573 elf_tdata (info->output_bfd)->has_gnu_symbols
1574 |= elf_gnu_symbol_ifunc;
1575 }
1576
1577 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1578 symtab_hdr, sym_hashes,
1579 &r_type, GOT_UNKNOWN,
1580 rel, rel_end, h, r_symndx, FALSE))
1581 goto error_return;
1582
1583 switch (r_type)
1584 {
1585 case R_386_TLS_LDM:
1586 htab->tls_ld_or_ldm_got.refcount += 1;
1587 goto create_got;
1588
1589 case R_386_PLT32:
1590 /* This symbol requires a procedure linkage table entry. We
1591 actually build the entry in adjust_dynamic_symbol,
1592 because this might be a case of linking PIC code which is
1593 never referenced by a dynamic object, in which case we
1594 don't need to generate a procedure linkage table entry
1595 after all. */
1596
1597 /* If this is a local symbol, we resolve it directly without
1598 creating a procedure linkage table entry. */
1599 if (h == NULL)
1600 continue;
1601
1602 eh->has_got_reloc = 1;
1603 h->needs_plt = 1;
1604 h->plt.refcount += 1;
1605 break;
1606
1607 case R_386_SIZE32:
1608 size_reloc = TRUE;
1609 goto do_size;
1610
1611 case R_386_TLS_IE_32:
1612 case R_386_TLS_IE:
1613 case R_386_TLS_GOTIE:
1614 if (!bfd_link_executable (info))
1615 info->flags |= DF_STATIC_TLS;
1616 /* Fall through */
1617
1618 case R_386_GOT32:
1619 case R_386_GOT32X:
1620 case R_386_TLS_GD:
1621 case R_386_TLS_GOTDESC:
1622 case R_386_TLS_DESC_CALL:
1623 /* This symbol requires a global offset table entry. */
1624 {
1625 int tls_type, old_tls_type;
1626
1627 switch (r_type)
1628 {
1629 default:
1630 case R_386_GOT32:
1631 case R_386_GOT32X:
1632 tls_type = GOT_NORMAL;
1633 break;
1634 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1635 case R_386_TLS_GOTDESC:
1636 case R_386_TLS_DESC_CALL:
1637 tls_type = GOT_TLS_GDESC; break;
1638 case R_386_TLS_IE_32:
1639 if (ELF32_R_TYPE (rel->r_info) == r_type)
1640 tls_type = GOT_TLS_IE_NEG;
1641 else
1642 /* If this is a GD->IE transition, we may use either of
1643 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1644 tls_type = GOT_TLS_IE;
1645 break;
1646 case R_386_TLS_IE:
1647 case R_386_TLS_GOTIE:
1648 tls_type = GOT_TLS_IE_POS; break;
1649 }
1650
1651 if (h != NULL)
1652 {
1653 h->got.refcount += 1;
1654 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1655 }
1656 else
1657 {
1658 bfd_signed_vma *local_got_refcounts;
1659
1660 /* This is a global offset table entry for a local symbol. */
1661 local_got_refcounts = elf_local_got_refcounts (abfd);
1662 if (local_got_refcounts == NULL)
1663 {
1664 bfd_size_type size;
1665
1666 size = symtab_hdr->sh_info;
1667 size *= (sizeof (bfd_signed_vma)
1668 + sizeof (bfd_vma) + sizeof(char));
1669 local_got_refcounts = (bfd_signed_vma *)
1670 bfd_zalloc (abfd, size);
1671 if (local_got_refcounts == NULL)
1672 goto error_return;
1673 elf_local_got_refcounts (abfd) = local_got_refcounts;
1674 elf_x86_local_tlsdesc_gotent (abfd)
1675 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1676 elf_x86_local_got_tls_type (abfd)
1677 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1678 }
1679 local_got_refcounts[r_symndx] += 1;
1680 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1681 }
1682
1683 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1684 tls_type |= old_tls_type;
1685 /* If a TLS symbol is accessed using IE at least once,
1686 there is no point to use dynamic model for it. */
1687 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1688 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1689 || (tls_type & GOT_TLS_IE) == 0))
1690 {
1691 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1692 tls_type = old_tls_type;
1693 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1694 && GOT_TLS_GD_ANY_P (tls_type))
1695 tls_type |= old_tls_type;
1696 else
1697 {
1698 if (h)
1699 name = h->root.root.string;
1700 else
1701 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1702 NULL);
1703 _bfd_error_handler
1704 /* xgettext:c-format */
1705 (_("%B: `%s' accessed both as normal and "
1706 "thread local symbol"),
1707 abfd, name);
1708 bfd_set_error (bfd_error_bad_value);
1709 goto error_return;
1710 }
1711 }
1712
1713 if (old_tls_type != tls_type)
1714 {
1715 if (h != NULL)
1716 elf_x86_hash_entry (h)->tls_type = tls_type;
1717 else
1718 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1719 }
1720 }
1721 /* Fall through */
1722
1723 case R_386_GOTOFF:
1724 case R_386_GOTPC:
1725 create_got:
1726 if (r_type != R_386_TLS_IE)
1727 {
1728 if (eh != NULL)
1729 eh->has_got_reloc = 1;
1730 break;
1731 }
1732 /* Fall through */
1733
1734 case R_386_TLS_LE_32:
1735 case R_386_TLS_LE:
1736 if (eh != NULL)
1737 eh->has_got_reloc = 1;
1738 if (bfd_link_executable (info))
1739 break;
1740 info->flags |= DF_STATIC_TLS;
1741 goto do_relocation;
1742
1743 case R_386_32:
1744 case R_386_PC32:
1745 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1746 eh->has_non_got_reloc = 1;
1747 do_relocation:
1748 /* We are called after all symbols have been resolved. Only
1749 relocation against STT_GNU_IFUNC symbol must go through
1750 PLT. */
1751 if (h != NULL
1752 && (bfd_link_executable (info)
1753 || h->type == STT_GNU_IFUNC))
1754 {
1755 /* If this reloc is in a read-only section, we might
1756 need a copy reloc. We can't check reliably at this
1757 stage whether the section is read-only, as input
1758 sections have not yet been mapped to output sections.
1759 Tentatively set the flag for now, and correct in
1760 adjust_dynamic_symbol. */
1761 h->non_got_ref = 1;
1762
1763 /* We may need a .plt entry if the symbol is a function
1764 defined in a shared lib or is a STT_GNU_IFUNC function
1765 referenced from the code or read-only section. */
1766 if (!h->def_regular
1767 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1768 h->plt.refcount += 1;
1769
1770 if (r_type == R_386_PC32)
1771 {
1772 /* Since something like ".long foo - ." may be used
1773 as pointer, make sure that PLT is used if foo is
1774 a function defined in a shared library. */
1775 if ((sec->flags & SEC_CODE) == 0)
1776 h->pointer_equality_needed = 1;
1777 else if (h->type == STT_GNU_IFUNC
1778 && bfd_link_pic (info))
1779 {
1780 _bfd_error_handler
1781 /* xgettext:c-format */
1782 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1783 abfd, h->root.root.string);
1784 bfd_set_error (bfd_error_bad_value);
1785 goto error_return;
1786 }
1787 }
1788 else
1789 {
1790 h->pointer_equality_needed = 1;
1791 /* R_386_32 can be resolved at run-time. */
1792 if (r_type == R_386_32
1793 && (sec->flags & SEC_READONLY) == 0)
1794 eh->func_pointer_refcount += 1;
1795 }
1796 }
1797
1798 size_reloc = FALSE;
1799 do_size:
1800 /* If we are creating a shared library, and this is a reloc
1801 against a global symbol, or a non PC relative reloc
1802 against a local symbol, then we need to copy the reloc
1803 into the shared library. However, if we are linking with
1804 -Bsymbolic, we do not need to copy a reloc against a
1805 global symbol which is defined in an object we are
1806 including in the link (i.e., DEF_REGULAR is set). At
1807 this point we have not seen all the input files, so it is
1808 possible that DEF_REGULAR is not set now but will be set
1809 later (it is never cleared). In case of a weak definition,
1810 DEF_REGULAR may be cleared later by a strong definition in
1811 a shared library. We account for that possibility below by
1812 storing information in the relocs_copied field of the hash
1813 table entry. A similar situation occurs when creating
1814 shared libraries and symbol visibility changes render the
1815 symbol local.
1816
1817 If on the other hand, we are creating an executable, we
1818 may need to keep relocations for symbols satisfied by a
1819 dynamic library if we manage to avoid copy relocs for the
1820 symbol.
1821
1822 Generate dynamic pointer relocation against STT_GNU_IFUNC
1823 symbol in the non-code section. */
1824 if ((bfd_link_pic (info)
1825 && (r_type != R_386_PC32
1826 || (h != NULL
1827 && (! (bfd_link_pie (info)
1828 || SYMBOLIC_BIND (info, h))
1829 || h->root.type == bfd_link_hash_defweak
1830 || !h->def_regular))))
1831 || (h != NULL
1832 && h->type == STT_GNU_IFUNC
1833 && r_type == R_386_32
1834 && (sec->flags & SEC_CODE) == 0)
1835 || (ELIMINATE_COPY_RELOCS
1836 && !bfd_link_pic (info)
1837 && h != NULL
1838 && (h->root.type == bfd_link_hash_defweak
1839 || !h->def_regular)))
1840 {
1841 struct elf_dyn_relocs *p;
1842 struct elf_dyn_relocs **head;
1843
1844 /* We must copy these reloc types into the output file.
1845 Create a reloc section in dynobj and make room for
1846 this reloc. */
1847 if (sreloc == NULL)
1848 {
1849 sreloc = _bfd_elf_make_dynamic_reloc_section
1850 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1851
1852 if (sreloc == NULL)
1853 goto error_return;
1854 }
1855
1856 /* If this is a global symbol, we count the number of
1857 relocations we need for this symbol. */
1858 if (h != NULL)
1859 {
1860 head = &eh->dyn_relocs;
1861 }
1862 else
1863 {
1864 /* Track dynamic relocs needed for local syms too.
1865 We really need local syms available to do this
1866 easily. Oh well. */
1867 void **vpp;
1868 asection *s;
1869
1870 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1871 abfd, r_symndx);
1872 if (isym == NULL)
1873 goto error_return;
1874
1875 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1876 if (s == NULL)
1877 s = sec;
1878
1879 vpp = &elf_section_data (s)->local_dynrel;
1880 head = (struct elf_dyn_relocs **)vpp;
1881 }
1882
1883 p = *head;
1884 if (p == NULL || p->sec != sec)
1885 {
1886 bfd_size_type amt = sizeof *p;
1887 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1888 amt);
1889 if (p == NULL)
1890 goto error_return;
1891 p->next = *head;
1892 *head = p;
1893 p->sec = sec;
1894 p->count = 0;
1895 p->pc_count = 0;
1896 }
1897
1898 p->count += 1;
1899 /* Count size relocation as PC-relative relocation. */
1900 if (r_type == R_386_PC32 || size_reloc)
1901 p->pc_count += 1;
1902 }
1903 break;
1904
1905 /* This relocation describes the C++ object vtable hierarchy.
1906 Reconstruct it for later use during GC. */
1907 case R_386_GNU_VTINHERIT:
1908 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1909 goto error_return;
1910 break;
1911
1912 /* This relocation describes which C++ vtable entries are actually
1913 used. Record for later use during GC. */
1914 case R_386_GNU_VTENTRY:
1915 BFD_ASSERT (h != NULL);
1916 if (h != NULL
1917 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1918 goto error_return;
1919 break;
1920
1921 default:
1922 break;
1923 }
1924
1925 if (r_type == R_386_GOT32X
1926 && (h == NULL || h->type != STT_GNU_IFUNC))
1927 sec->need_convert_load = 1;
1928 }
1929
1930 if (elf_section_data (sec)->this_hdr.contents != contents)
1931 {
1932 if (!info->keep_memory)
1933 free (contents);
1934 else
1935 {
1936 /* Cache the section contents for elf_link_input_bfd. */
1937 elf_section_data (sec)->this_hdr.contents = contents;
1938 }
1939 }
1940
1941 return TRUE;
1942
1943 error_return:
1944 if (elf_section_data (sec)->this_hdr.contents != contents)
1945 free (contents);
1946 sec->check_relocs_failed = 1;
1947 return FALSE;
1948 }
1949
1950 /* Convert load via the GOT slot to load immediate. */
1951
1952 static bfd_boolean
1953 elf_i386_convert_load (bfd *abfd, asection *sec,
1954 struct bfd_link_info *link_info)
1955 {
1956 struct elf_x86_link_hash_table *htab;
1957 Elf_Internal_Shdr *symtab_hdr;
1958 Elf_Internal_Rela *internal_relocs;
1959 Elf_Internal_Rela *irel, *irelend;
1960 bfd_byte *contents;
1961 bfd_boolean changed;
1962 bfd_signed_vma *local_got_refcounts;
1963
1964 /* Don't even try to convert non-ELF outputs. */
1965 if (!is_elf_hash_table (link_info->hash))
1966 return FALSE;
1967
1968 /* Nothing to do if there is no need or no output. */
1969 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
1970 || sec->need_convert_load == 0
1971 || bfd_is_abs_section (sec->output_section))
1972 return TRUE;
1973
1974 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1975
1976 /* Load the relocations for this section. */
1977 internal_relocs = (_bfd_elf_link_read_relocs
1978 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
1979 link_info->keep_memory));
1980 if (internal_relocs == NULL)
1981 return FALSE;
1982
1983 changed = FALSE;
1984 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1985 local_got_refcounts = elf_local_got_refcounts (abfd);
1986
1987 /* Get the section contents. */
1988 if (elf_section_data (sec)->this_hdr.contents != NULL)
1989 contents = elf_section_data (sec)->this_hdr.contents;
1990 else
1991 {
1992 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1993 goto error_return;
1994 }
1995
1996 irelend = internal_relocs + sec->reloc_count;
1997 for (irel = internal_relocs; irel < irelend; irel++)
1998 {
1999 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2000 unsigned int r_symndx;
2001 struct elf_link_hash_entry *h;
2002 bfd_boolean converted;
2003
2004 /* Don't convert R_386_GOT32 since we can't tell if it is applied
2005 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
2006 if (r_type != R_386_GOT32X)
2007 continue;
2008
2009 r_symndx = ELF32_R_SYM (irel->r_info);
2010 if (r_symndx < symtab_hdr->sh_info)
2011 h = _bfd_elf_x86_get_local_sym_hash (htab, sec->owner,
2012 (const Elf_Internal_Rela *) irel,
2013 FALSE);
2014 else
2015 {
2016 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
2017 while (h->root.type == bfd_link_hash_indirect
2018 || h->root.type == bfd_link_hash_warning)
2019 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2020 }
2021
2022 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2023 if (h != NULL && h->type == STT_GNU_IFUNC)
2024 continue;
2025
2026 converted = FALSE;
2027 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
2028 irel, h, &converted, link_info))
2029 goto error_return;
2030
2031 if (converted)
2032 {
2033 changed = converted;
2034 if (h)
2035 {
2036 if (h->got.refcount > 0)
2037 h->got.refcount -= 1;
2038 }
2039 else
2040 {
2041 if (local_got_refcounts != NULL
2042 && local_got_refcounts[r_symndx] > 0)
2043 local_got_refcounts[r_symndx] -= 1;
2044 }
2045 }
2046 }
2047
2048 if (contents != NULL
2049 && elf_section_data (sec)->this_hdr.contents != contents)
2050 {
2051 if (!changed && !link_info->keep_memory)
2052 free (contents);
2053 else
2054 {
2055 /* Cache the section contents for elf_link_input_bfd. */
2056 elf_section_data (sec)->this_hdr.contents = contents;
2057 }
2058 }
2059
2060 if (elf_section_data (sec)->relocs != internal_relocs)
2061 {
2062 if (!changed)
2063 free (internal_relocs);
2064 else
2065 elf_section_data (sec)->relocs = internal_relocs;
2066 }
2067
2068 return TRUE;
2069
2070 error_return:
2071 if (contents != NULL
2072 && elf_section_data (sec)->this_hdr.contents != contents)
2073 free (contents);
2074 if (internal_relocs != NULL
2075 && elf_section_data (sec)->relocs != internal_relocs)
2076 free (internal_relocs);
2077 return FALSE;
2078 }
2079
2080 /* Set the sizes of the dynamic sections. */
2081
2082 static bfd_boolean
2083 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2084 {
2085 struct elf_x86_link_hash_table *htab;
2086 bfd *dynobj;
2087 asection *s;
2088 bfd_boolean relocs;
2089 bfd *ibfd;
2090
2091 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2092 if (htab == NULL)
2093 return FALSE;
2094 dynobj = htab->elf.dynobj;
2095 if (dynobj == NULL)
2096 abort ();
2097
2098 /* Set up .got offsets for local syms, and space for local dynamic
2099 relocs. */
2100 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2101 {
2102 bfd_signed_vma *local_got;
2103 bfd_signed_vma *end_local_got;
2104 char *local_tls_type;
2105 bfd_vma *local_tlsdesc_gotent;
2106 bfd_size_type locsymcount;
2107 Elf_Internal_Shdr *symtab_hdr;
2108 asection *srel;
2109
2110 if (! is_x86_elf (ibfd, htab))
2111 continue;
2112
2113 for (s = ibfd->sections; s != NULL; s = s->next)
2114 {
2115 struct elf_dyn_relocs *p;
2116
2117 if (!elf_i386_convert_load (ibfd, s, info))
2118 return FALSE;
2119
2120 for (p = ((struct elf_dyn_relocs *)
2121 elf_section_data (s)->local_dynrel);
2122 p != NULL;
2123 p = p->next)
2124 {
2125 if (!bfd_is_abs_section (p->sec)
2126 && bfd_is_abs_section (p->sec->output_section))
2127 {
2128 /* Input section has been discarded, either because
2129 it is a copy of a linkonce section or due to
2130 linker script /DISCARD/, so we'll be discarding
2131 the relocs too. */
2132 }
2133 else if (htab->is_vxworks
2134 && strcmp (p->sec->output_section->name,
2135 ".tls_vars") == 0)
2136 {
2137 /* Relocations in vxworks .tls_vars sections are
2138 handled specially by the loader. */
2139 }
2140 else if (p->count != 0)
2141 {
2142 srel = elf_section_data (p->sec)->sreloc;
2143 srel->size += p->count * sizeof (Elf32_External_Rel);
2144 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2145 && (info->flags & DF_TEXTREL) == 0)
2146 {
2147 info->flags |= DF_TEXTREL;
2148 if ((info->warn_shared_textrel && bfd_link_pic (info))
2149 || info->error_textrel)
2150 /* xgettext:c-format */
2151 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
2152 p->sec->owner, p->sec);
2153 }
2154 }
2155 }
2156 }
2157
2158 local_got = elf_local_got_refcounts (ibfd);
2159 if (!local_got)
2160 continue;
2161
2162 symtab_hdr = &elf_symtab_hdr (ibfd);
2163 locsymcount = symtab_hdr->sh_info;
2164 end_local_got = local_got + locsymcount;
2165 local_tls_type = elf_x86_local_got_tls_type (ibfd);
2166 local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd);
2167 s = htab->elf.sgot;
2168 srel = htab->elf.srelgot;
2169 for (; local_got < end_local_got;
2170 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2171 {
2172 *local_tlsdesc_gotent = (bfd_vma) -1;
2173 if (*local_got > 0)
2174 {
2175 if (GOT_TLS_GDESC_P (*local_tls_type))
2176 {
2177 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2178 - elf_x86_compute_jump_table_size (htab);
2179 htab->elf.sgotplt->size += 8;
2180 *local_got = (bfd_vma) -2;
2181 }
2182 if (! GOT_TLS_GDESC_P (*local_tls_type)
2183 || GOT_TLS_GD_P (*local_tls_type))
2184 {
2185 *local_got = s->size;
2186 s->size += 4;
2187 if (GOT_TLS_GD_P (*local_tls_type)
2188 || *local_tls_type == GOT_TLS_IE_BOTH)
2189 s->size += 4;
2190 }
2191 if (bfd_link_pic (info)
2192 || GOT_TLS_GD_ANY_P (*local_tls_type)
2193 || (*local_tls_type & GOT_TLS_IE))
2194 {
2195 if (*local_tls_type == GOT_TLS_IE_BOTH)
2196 srel->size += 2 * sizeof (Elf32_External_Rel);
2197 else if (GOT_TLS_GD_P (*local_tls_type)
2198 || ! GOT_TLS_GDESC_P (*local_tls_type))
2199 srel->size += sizeof (Elf32_External_Rel);
2200 if (GOT_TLS_GDESC_P (*local_tls_type))
2201 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2202 }
2203 }
2204 else
2205 *local_got = (bfd_vma) -1;
2206 }
2207 }
2208
2209 if (htab->tls_ld_or_ldm_got.refcount > 0)
2210 {
2211 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2212 relocs. */
2213 htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
2214 htab->elf.sgot->size += 8;
2215 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2216 }
2217 else
2218 htab->tls_ld_or_ldm_got.offset = -1;
2219
2220 /* Allocate global sym .plt and .got entries, and space for global
2221 sym dynamic relocs. */
2222 elf_link_hash_traverse (&htab->elf, _bfd_x86_elf_allocate_dynrelocs,
2223 info);
2224
2225 /* Allocate .plt and .got entries, and space for local symbols. */
2226 htab_traverse (htab->loc_hash_table,
2227 _bfd_x86_elf_allocate_local_dynrelocs,
2228 info);
2229
2230 /* For every jump slot reserved in the sgotplt, reloc_count is
2231 incremented. However, when we reserve space for TLS descriptors,
2232 it's not incremented, so in order to compute the space reserved
2233 for them, it suffices to multiply the reloc count by the jump
2234 slot size.
2235
2236 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2237 so that R_386_IRELATIVE entries come last. */
2238 if (htab->elf.srelplt)
2239 {
2240 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2241 htab->sgotplt_jump_table_size
2242 = elf_x86_compute_jump_table_size (htab);
2243 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2244 }
2245 else if (htab->elf.irelplt)
2246 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2247
2248
2249 if (htab->elf.sgotplt)
2250 {
2251 /* Don't allocate .got.plt section if there are no GOT nor PLT
2252 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2253 if ((htab->elf.hgot == NULL
2254 || !htab->elf.hgot->ref_regular_nonweak)
2255 && (htab->elf.sgotplt->size
2256 == get_elf_backend_data (output_bfd)->got_header_size)
2257 && (htab->elf.splt == NULL
2258 || htab->elf.splt->size == 0)
2259 && (htab->elf.sgot == NULL
2260 || htab->elf.sgot->size == 0)
2261 && (htab->elf.iplt == NULL
2262 || htab->elf.iplt->size == 0)
2263 && (htab->elf.igotplt == NULL
2264 || htab->elf.igotplt->size == 0))
2265 htab->elf.sgotplt->size = 0;
2266 }
2267
2268 if (_bfd_elf_eh_frame_present (info))
2269 {
2270 if (htab->plt_eh_frame != NULL
2271 && htab->elf.splt != NULL
2272 && htab->elf.splt->size != 0
2273 && !bfd_is_abs_section (htab->elf.splt->output_section))
2274 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
2275
2276 if (htab->plt_got_eh_frame != NULL
2277 && htab->plt_got != NULL
2278 && htab->plt_got->size != 0
2279 && !bfd_is_abs_section (htab->plt_got->output_section))
2280 htab->plt_got_eh_frame->size
2281 = htab->non_lazy_plt->eh_frame_plt_size;
2282
2283 /* Unwind info for the second PLT and .plt.got sections are
2284 identical. */
2285 if (htab->plt_second_eh_frame != NULL
2286 && htab->plt_second != NULL
2287 && htab->plt_second->size != 0
2288 && !bfd_is_abs_section (htab->plt_second->output_section))
2289 htab->plt_second_eh_frame->size
2290 = htab->non_lazy_plt->eh_frame_plt_size;
2291 }
2292
2293 /* We now have determined the sizes of the various dynamic sections.
2294 Allocate memory for them. */
2295 relocs = FALSE;
2296 for (s = dynobj->sections; s != NULL; s = s->next)
2297 {
2298 bfd_boolean strip_section = TRUE;
2299
2300 if ((s->flags & SEC_LINKER_CREATED) == 0)
2301 continue;
2302
2303 if (s == htab->elf.splt
2304 || s == htab->elf.sgot)
2305 {
2306 /* Strip this section if we don't need it; see the
2307 comment below. */
2308 /* We'd like to strip these sections if they aren't needed, but if
2309 we've exported dynamic symbols from them we must leave them.
2310 It's too late to tell BFD to get rid of the symbols. */
2311
2312 if (htab->elf.hplt != NULL)
2313 strip_section = FALSE;
2314 }
2315 else if (s == htab->elf.sgotplt
2316 || s == htab->elf.iplt
2317 || s == htab->elf.igotplt
2318 || s == htab->plt_second
2319 || s == htab->plt_got
2320 || s == htab->plt_eh_frame
2321 || s == htab->plt_got_eh_frame
2322 || s == htab->plt_second_eh_frame
2323 || s == htab->elf.sdynbss
2324 || s == htab->elf.sdynrelro)
2325 {
2326 /* Strip these too. */
2327 }
2328 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2329 {
2330 if (s->size != 0
2331 && s != htab->elf.srelplt
2332 && s != htab->srelplt2)
2333 relocs = TRUE;
2334
2335 /* We use the reloc_count field as a counter if we need
2336 to copy relocs into the output file. */
2337 s->reloc_count = 0;
2338 }
2339 else
2340 {
2341 /* It's not one of our sections, so don't allocate space. */
2342 continue;
2343 }
2344
2345 if (s->size == 0)
2346 {
2347 /* If we don't need this section, strip it from the
2348 output file. This is mostly to handle .rel.bss and
2349 .rel.plt. We must create both sections in
2350 create_dynamic_sections, because they must be created
2351 before the linker maps input sections to output
2352 sections. The linker does that before
2353 adjust_dynamic_symbol is called, and it is that
2354 function which decides whether anything needs to go
2355 into these sections. */
2356 if (strip_section)
2357 s->flags |= SEC_EXCLUDE;
2358 continue;
2359 }
2360
2361 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2362 continue;
2363
2364 /* Allocate memory for the section contents. We use bfd_zalloc
2365 here in case unused entries are not reclaimed before the
2366 section's contents are written out. This should not happen,
2367 but this way if it does, we get a R_386_NONE reloc instead
2368 of garbage. */
2369 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2370 if (s->contents == NULL)
2371 return FALSE;
2372 }
2373
2374 if (htab->plt_eh_frame != NULL
2375 && htab->plt_eh_frame->contents != NULL)
2376 {
2377 memcpy (htab->plt_eh_frame->contents,
2378 htab->plt.eh_frame_plt,
2379 htab->plt_eh_frame->size);
2380 bfd_put_32 (dynobj, htab->elf.splt->size,
2381 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2382 }
2383
2384 if (htab->plt_got_eh_frame != NULL
2385 && htab->plt_got_eh_frame->contents != NULL)
2386 {
2387 memcpy (htab->plt_got_eh_frame->contents,
2388 htab->non_lazy_plt->eh_frame_plt,
2389 htab->plt_got_eh_frame->size);
2390 bfd_put_32 (dynobj, htab->plt_got->size,
2391 (htab->plt_got_eh_frame->contents
2392 + PLT_FDE_LEN_OFFSET));
2393 }
2394
2395 if (htab->plt_second_eh_frame != NULL
2396 && htab->plt_second_eh_frame->contents != NULL)
2397 {
2398 memcpy (htab->plt_second_eh_frame->contents,
2399 htab->non_lazy_plt->eh_frame_plt,
2400 htab->plt_second_eh_frame->size);
2401 bfd_put_32 (dynobj, htab->plt_second->size,
2402 (htab->plt_second_eh_frame->contents
2403 + PLT_FDE_LEN_OFFSET));
2404 }
2405
2406 if (htab->elf.dynamic_sections_created)
2407 {
2408 /* Add some entries to the .dynamic section. We fill in the
2409 values later, in elf_i386_finish_dynamic_sections, but we
2410 must add the entries now so that we get the correct size for
2411 the .dynamic section. The DT_DEBUG entry is filled in by the
2412 dynamic linker and used by the debugger. */
2413 #define add_dynamic_entry(TAG, VAL) \
2414 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2415
2416 if (bfd_link_executable (info))
2417 {
2418 if (!add_dynamic_entry (DT_DEBUG, 0))
2419 return FALSE;
2420 }
2421
2422 if (htab->elf.splt->size != 0)
2423 {
2424 /* DT_PLTGOT is used by prelink even if there is no PLT
2425 relocation. */
2426 if (!add_dynamic_entry (DT_PLTGOT, 0))
2427 return FALSE;
2428 }
2429
2430 if (htab->elf.srelplt->size != 0)
2431 {
2432 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
2433 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2434 || !add_dynamic_entry (DT_JMPREL, 0))
2435 return FALSE;
2436 }
2437
2438 if (relocs)
2439 {
2440 if (!add_dynamic_entry (DT_REL, 0)
2441 || !add_dynamic_entry (DT_RELSZ, 0)
2442 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2443 return FALSE;
2444
2445 /* If any dynamic relocs apply to a read-only section,
2446 then we need a DT_TEXTREL entry. */
2447 if ((info->flags & DF_TEXTREL) == 0)
2448 elf_link_hash_traverse (&htab->elf,
2449 _bfd_x86_elf_readonly_dynrelocs,
2450 info);
2451
2452 if ((info->flags & DF_TEXTREL) != 0)
2453 {
2454 if (htab->readonly_dynrelocs_against_ifunc)
2455 {
2456 info->callbacks->einfo
2457 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
2458 bfd_set_error (bfd_error_bad_value);
2459 return FALSE;
2460 }
2461
2462 if (!add_dynamic_entry (DT_TEXTREL, 0))
2463 return FALSE;
2464 }
2465 }
2466 if (htab->is_vxworks
2467 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2468 return FALSE;
2469 }
2470 #undef add_dynamic_entry
2471
2472 return TRUE;
2473 }
2474
2475 /* Set the correct type for an x86 ELF section. We do this by the
2476 section name, which is a hack, but ought to work. */
2477
2478 static bfd_boolean
2479 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2480 Elf_Internal_Shdr *hdr,
2481 asection *sec)
2482 {
2483 const char *name;
2484
2485 name = bfd_get_section_name (abfd, sec);
2486
2487 /* This is an ugly, but unfortunately necessary hack that is
2488 needed when producing EFI binaries on x86. It tells
2489 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2490 containing ELF relocation info. We need this hack in order to
2491 be able to generate ELF binaries that can be translated into
2492 EFI applications (which are essentially COFF objects). Those
2493 files contain a COFF ".reloc" section inside an ELFNN object,
2494 which would normally cause BFD to segfault because it would
2495 attempt to interpret this section as containing relocation
2496 entries for section "oc". With this hack enabled, ".reloc"
2497 will be treated as a normal data section, which will avoid the
2498 segfault. However, you won't be able to create an ELFNN binary
2499 with a section named "oc" that needs relocations, but that's
2500 the kind of ugly side-effects you get when detecting section
2501 types based on their names... In practice, this limitation is
2502 unlikely to bite. */
2503 if (strcmp (name, ".reloc") == 0)
2504 hdr->sh_type = SHT_PROGBITS;
2505
2506 return TRUE;
2507 }
2508
2509 /* Return the relocation value for @tpoff relocation
2510 if STT_TLS virtual address is ADDRESS. */
2511
2512 static bfd_vma
2513 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2514 {
2515 struct elf_link_hash_table *htab = elf_hash_table (info);
2516 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2517 bfd_vma static_tls_size;
2518
2519 /* If tls_sec is NULL, we should have signalled an error already. */
2520 if (htab->tls_sec == NULL)
2521 return 0;
2522
2523 /* Consider special static TLS alignment requirements. */
2524 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2525 return static_tls_size + htab->tls_sec->vma - address;
2526 }
2527
2528 /* Relocate an i386 ELF section. */
2529
2530 static bfd_boolean
2531 elf_i386_relocate_section (bfd *output_bfd,
2532 struct bfd_link_info *info,
2533 bfd *input_bfd,
2534 asection *input_section,
2535 bfd_byte *contents,
2536 Elf_Internal_Rela *relocs,
2537 Elf_Internal_Sym *local_syms,
2538 asection **local_sections)
2539 {
2540 struct elf_x86_link_hash_table *htab;
2541 Elf_Internal_Shdr *symtab_hdr;
2542 struct elf_link_hash_entry **sym_hashes;
2543 bfd_vma *local_got_offsets;
2544 bfd_vma *local_tlsdesc_gotents;
2545 Elf_Internal_Rela *rel;
2546 Elf_Internal_Rela *wrel;
2547 Elf_Internal_Rela *relend;
2548 bfd_boolean is_vxworks_tls;
2549 unsigned plt_entry_size;
2550
2551 /* Skip if check_relocs failed. */
2552 if (input_section->check_relocs_failed)
2553 return FALSE;
2554
2555 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2556 if (htab == NULL)
2557 return FALSE;
2558
2559 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2560
2561 symtab_hdr = &elf_symtab_hdr (input_bfd);
2562 sym_hashes = elf_sym_hashes (input_bfd);
2563 local_got_offsets = elf_local_got_offsets (input_bfd);
2564 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2565 /* We have to handle relocations in vxworks .tls_vars sections
2566 specially, because the dynamic loader is 'weird'. */
2567 is_vxworks_tls = (htab->is_vxworks
2568 && bfd_link_pic (info)
2569 && !strcmp (input_section->output_section->name,
2570 ".tls_vars"));
2571
2572 _bfd_x86_elf_set_tls_module_base (info);
2573
2574 plt_entry_size = htab->plt.plt_entry_size;
2575
2576 rel = wrel = relocs;
2577 relend = relocs + input_section->reloc_count;
2578 for (; rel < relend; wrel++, rel++)
2579 {
2580 unsigned int r_type;
2581 reloc_howto_type *howto;
2582 unsigned long r_symndx;
2583 struct elf_link_hash_entry *h;
2584 struct elf_x86_link_hash_entry *eh;
2585 Elf_Internal_Sym *sym;
2586 asection *sec;
2587 bfd_vma off, offplt, plt_offset;
2588 bfd_vma relocation;
2589 bfd_boolean unresolved_reloc;
2590 bfd_reloc_status_type r;
2591 unsigned int indx;
2592 int tls_type;
2593 bfd_vma st_size;
2594 asection *resolved_plt;
2595 bfd_boolean resolved_to_zero;
2596 bfd_boolean relative_reloc;
2597
2598 r_type = ELF32_R_TYPE (rel->r_info);
2599 if (r_type == R_386_GNU_VTINHERIT
2600 || r_type == R_386_GNU_VTENTRY)
2601 {
2602 if (wrel != rel)
2603 *wrel = *rel;
2604 continue;
2605 }
2606
2607 if ((indx = r_type) >= R_386_standard
2608 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2609 >= R_386_ext - R_386_standard)
2610 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2611 >= R_386_ext2 - R_386_ext))
2612 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2613
2614 howto = elf_howto_table + indx;
2615
2616 r_symndx = ELF32_R_SYM (rel->r_info);
2617 h = NULL;
2618 sym = NULL;
2619 sec = NULL;
2620 unresolved_reloc = FALSE;
2621 if (r_symndx < symtab_hdr->sh_info)
2622 {
2623 sym = local_syms + r_symndx;
2624 sec = local_sections[r_symndx];
2625 relocation = (sec->output_section->vma
2626 + sec->output_offset
2627 + sym->st_value);
2628 st_size = sym->st_size;
2629
2630 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2631 && ((sec->flags & SEC_MERGE) != 0
2632 || (bfd_link_relocatable (info)
2633 && sec->output_offset != 0)))
2634 {
2635 bfd_vma addend;
2636 bfd_byte *where = contents + rel->r_offset;
2637
2638 switch (howto->size)
2639 {
2640 case 0:
2641 addend = bfd_get_8 (input_bfd, where);
2642 if (howto->pc_relative)
2643 {
2644 addend = (addend ^ 0x80) - 0x80;
2645 addend += 1;
2646 }
2647 break;
2648 case 1:
2649 addend = bfd_get_16 (input_bfd, where);
2650 if (howto->pc_relative)
2651 {
2652 addend = (addend ^ 0x8000) - 0x8000;
2653 addend += 2;
2654 }
2655 break;
2656 case 2:
2657 addend = bfd_get_32 (input_bfd, where);
2658 if (howto->pc_relative)
2659 {
2660 addend = (addend ^ 0x80000000) - 0x80000000;
2661 addend += 4;
2662 }
2663 break;
2664 default:
2665 abort ();
2666 }
2667
2668 if (bfd_link_relocatable (info))
2669 addend += sec->output_offset;
2670 else
2671 {
2672 asection *msec = sec;
2673 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2674 addend);
2675 addend -= relocation;
2676 addend += msec->output_section->vma + msec->output_offset;
2677 }
2678
2679 switch (howto->size)
2680 {
2681 case 0:
2682 /* FIXME: overflow checks. */
2683 if (howto->pc_relative)
2684 addend -= 1;
2685 bfd_put_8 (input_bfd, addend, where);
2686 break;
2687 case 1:
2688 if (howto->pc_relative)
2689 addend -= 2;
2690 bfd_put_16 (input_bfd, addend, where);
2691 break;
2692 case 2:
2693 if (howto->pc_relative)
2694 addend -= 4;
2695 bfd_put_32 (input_bfd, addend, where);
2696 break;
2697 }
2698 }
2699 else if (!bfd_link_relocatable (info)
2700 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2701 {
2702 /* Relocate against local STT_GNU_IFUNC symbol. */
2703 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2704 FALSE);
2705 if (h == NULL)
2706 abort ();
2707
2708 /* Set STT_GNU_IFUNC symbol value. */
2709 h->root.u.def.value = sym->st_value;
2710 h->root.u.def.section = sec;
2711 }
2712 }
2713 else
2714 {
2715 bfd_boolean warned ATTRIBUTE_UNUSED;
2716 bfd_boolean ignored ATTRIBUTE_UNUSED;
2717
2718 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2719 r_symndx, symtab_hdr, sym_hashes,
2720 h, sec, relocation,
2721 unresolved_reloc, warned, ignored);
2722 st_size = h->size;
2723 }
2724
2725 if (sec != NULL && discarded_section (sec))
2726 {
2727 _bfd_clear_contents (howto, input_bfd, input_section,
2728 contents + rel->r_offset);
2729 wrel->r_offset = rel->r_offset;
2730 wrel->r_info = 0;
2731 wrel->r_addend = 0;
2732
2733 /* For ld -r, remove relocations in debug sections against
2734 sections defined in discarded sections. Not done for
2735 eh_frame editing code expects to be present. */
2736 if (bfd_link_relocatable (info)
2737 && (input_section->flags & SEC_DEBUGGING))
2738 wrel--;
2739
2740 continue;
2741 }
2742
2743 if (bfd_link_relocatable (info))
2744 {
2745 if (wrel != rel)
2746 *wrel = *rel;
2747 continue;
2748 }
2749
2750 eh = (struct elf_x86_link_hash_entry *) h;
2751
2752 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2753 it here if it is defined in a non-shared object. */
2754 if (h != NULL
2755 && h->type == STT_GNU_IFUNC
2756 && h->def_regular)
2757 {
2758 asection *gotplt, *base_got;
2759 bfd_vma plt_index;
2760 const char *name;
2761
2762 if ((input_section->flags & SEC_ALLOC) == 0)
2763 {
2764 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2765 sections because such sections are not SEC_ALLOC and
2766 thus ld.so will not process them. */
2767 if ((input_section->flags & SEC_DEBUGGING) != 0)
2768 continue;
2769 abort ();
2770 }
2771
2772 /* STT_GNU_IFUNC symbol must go through PLT. */
2773 if (htab->elf.splt != NULL)
2774 {
2775 if (htab->plt_second != NULL)
2776 {
2777 resolved_plt = htab->plt_second;
2778 plt_offset = eh->plt_second.offset;
2779 }
2780 else
2781 {
2782 resolved_plt = htab->elf.splt;
2783 plt_offset = h->plt.offset;
2784 }
2785 gotplt = htab->elf.sgotplt;
2786 }
2787 else
2788 {
2789 resolved_plt = htab->elf.iplt;
2790 plt_offset = h->plt.offset;
2791 gotplt = htab->elf.igotplt;
2792 }
2793
2794 switch (r_type)
2795 {
2796 default:
2797 break;
2798
2799 case R_386_GOT32:
2800 case R_386_GOT32X:
2801 base_got = htab->elf.sgot;
2802 off = h->got.offset;
2803
2804 if (base_got == NULL)
2805 abort ();
2806
2807 if (off == (bfd_vma) -1)
2808 {
2809 /* We can't use h->got.offset here to save state, or
2810 even just remember the offset, as finish_dynamic_symbol
2811 would use that as offset into .got. */
2812
2813 if (h->plt.offset == (bfd_vma) -1)
2814 abort ();
2815
2816 if (htab->elf.splt != NULL)
2817 {
2818 plt_index = (h->plt.offset / plt_entry_size
2819 - htab->plt.has_plt0);
2820 off = (plt_index + 3) * 4;
2821 base_got = htab->elf.sgotplt;
2822 }
2823 else
2824 {
2825 plt_index = h->plt.offset / plt_entry_size;
2826 off = plt_index * 4;
2827 base_got = htab->elf.igotplt;
2828 }
2829
2830 if (h->dynindx == -1
2831 || h->forced_local
2832 || info->symbolic)
2833 {
2834 /* This references the local defitionion. We must
2835 initialize this entry in the global offset table.
2836 Since the offset must always be a multiple of 8,
2837 we use the least significant bit to record
2838 whether we have initialized it already.
2839
2840 When doing a dynamic link, we create a .rela.got
2841 relocation entry to initialize the value. This
2842 is done in the finish_dynamic_symbol routine. */
2843 if ((off & 1) != 0)
2844 off &= ~1;
2845 else
2846 {
2847 bfd_put_32 (output_bfd, relocation,
2848 base_got->contents + off);
2849 h->got.offset |= 1;
2850 }
2851 }
2852
2853 relocation = off;
2854 }
2855 else
2856 relocation = (base_got->output_section->vma
2857 + base_got->output_offset + off
2858 - gotplt->output_section->vma
2859 - gotplt->output_offset);
2860
2861 if (rel->r_offset > 1
2862 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2863 && *(contents + rel->r_offset - 2) != 0x8d)
2864 {
2865 if (bfd_link_pic (info))
2866 goto disallow_got32;
2867
2868 /* Add the GOT base if there is no base register. */
2869 relocation += (gotplt->output_section->vma
2870 + gotplt->output_offset);
2871 }
2872 else if (htab->elf.splt == NULL)
2873 {
2874 /* Adjust for static executables. */
2875 relocation += gotplt->output_offset;
2876 }
2877
2878 goto do_relocation;
2879 }
2880
2881 if (h->plt.offset == (bfd_vma) -1)
2882 {
2883 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2884 if (r_type == R_386_32
2885 && (input_section->flags & SEC_CODE) == 0)
2886 goto do_ifunc_pointer;
2887 goto bad_ifunc_reloc;
2888 }
2889
2890 relocation = (resolved_plt->output_section->vma
2891 + resolved_plt->output_offset + plt_offset);
2892
2893 switch (r_type)
2894 {
2895 default:
2896 bad_ifunc_reloc:
2897 if (h->root.root.string)
2898 name = h->root.root.string;
2899 else
2900 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2901 NULL);
2902 _bfd_error_handler
2903 /* xgettext:c-format */
2904 (_("%B: relocation %s against STT_GNU_IFUNC "
2905 "symbol `%s' isn't supported"), input_bfd,
2906 howto->name, name);
2907 bfd_set_error (bfd_error_bad_value);
2908 return FALSE;
2909
2910 case R_386_32:
2911 /* Generate dynamic relcoation only when there is a
2912 non-GOT reference in a shared object. */
2913 if ((bfd_link_pic (info) && h->non_got_ref)
2914 || h->plt.offset == (bfd_vma) -1)
2915 {
2916 Elf_Internal_Rela outrel;
2917 asection *sreloc;
2918 bfd_vma offset;
2919
2920 do_ifunc_pointer:
2921 /* Need a dynamic relocation to get the real function
2922 adddress. */
2923 offset = _bfd_elf_section_offset (output_bfd,
2924 info,
2925 input_section,
2926 rel->r_offset);
2927 if (offset == (bfd_vma) -1
2928 || offset == (bfd_vma) -2)
2929 abort ();
2930
2931 outrel.r_offset = (input_section->output_section->vma
2932 + input_section->output_offset
2933 + offset);
2934
2935 if (h->dynindx == -1
2936 || h->forced_local
2937 || bfd_link_executable (info))
2938 {
2939 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2940 h->root.root.string,
2941 h->root.u.def.section->owner);
2942
2943 /* This symbol is resolved locally. */
2944 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2945 bfd_put_32 (output_bfd,
2946 (h->root.u.def.value
2947 + h->root.u.def.section->output_section->vma
2948 + h->root.u.def.section->output_offset),
2949 contents + offset);
2950 }
2951 else
2952 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2953
2954 /* Dynamic relocations are stored in
2955 1. .rel.ifunc section in PIC object.
2956 2. .rel.got section in dynamic executable.
2957 3. .rel.iplt section in static executable. */
2958 if (bfd_link_pic (info))
2959 sreloc = htab->elf.irelifunc;
2960 else if (htab->elf.splt != NULL)
2961 sreloc = htab->elf.srelgot;
2962 else
2963 sreloc = htab->elf.irelplt;
2964 elf_append_rel (output_bfd, sreloc, &outrel);
2965
2966 /* If this reloc is against an external symbol, we
2967 do not want to fiddle with the addend. Otherwise,
2968 we need to include the symbol value so that it
2969 becomes an addend for the dynamic reloc. For an
2970 internal symbol, we have updated addend. */
2971 continue;
2972 }
2973 /* FALLTHROUGH */
2974 case R_386_PC32:
2975 case R_386_PLT32:
2976 goto do_relocation;
2977
2978 case R_386_GOTOFF:
2979 relocation -= (gotplt->output_section->vma
2980 + gotplt->output_offset);
2981 goto do_relocation;
2982 }
2983 }
2984
2985 resolved_to_zero = (eh != NULL
2986 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2987 I386_ELF_DATA,
2988 eh->has_got_reloc,
2989 eh));
2990
2991 switch (r_type)
2992 {
2993 case R_386_GOT32X:
2994 /* Avoid optimizing _DYNAMIC since ld.so may use its
2995 link-time address. */
2996 if (h == htab->elf.hdynamic)
2997 goto r_386_got32;
2998
2999 if (bfd_link_pic (info))
3000 {
3001 /* It is OK to convert mov to lea and convert indirect
3002 branch to direct branch. It is OK to convert adc,
3003 add, and, cmp, or, sbb, sub, test, xor only when PIC
3004 is false. */
3005 unsigned int opcode, addend;
3006 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
3007 if (addend != 0)
3008 goto r_386_got32;
3009 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3010 if (opcode != 0x8b && opcode != 0xff)
3011 goto r_386_got32;
3012 }
3013
3014 /* Resolve "mov GOT[(%reg)], %reg",
3015 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
3016 and "binop foo@GOT[(%reg)], %reg". */
3017 if (h == NULL
3018 || (h->plt.offset == (bfd_vma) -1
3019 && h->got.offset == (bfd_vma) -1)
3020 || htab->elf.sgotplt == NULL)
3021 abort ();
3022
3023 offplt = (htab->elf.sgotplt->output_section->vma
3024 + htab->elf.sgotplt->output_offset);
3025
3026 /* It is relative to .got.plt section. */
3027 if (h->got.offset != (bfd_vma) -1)
3028 /* Use GOT entry. Mask off the least significant bit in
3029 GOT offset which may be set by R_386_GOT32 processing
3030 below. */
3031 relocation = (htab->elf.sgot->output_section->vma
3032 + htab->elf.sgot->output_offset
3033 + (h->got.offset & ~1) - offplt);
3034 else
3035 /* Use GOTPLT entry. */
3036 relocation = (h->plt.offset / plt_entry_size
3037 - htab->plt.has_plt0 + 3) * 4;
3038
3039 if (!bfd_link_pic (info))
3040 {
3041 /* If not PIC, add the .got.plt section address for
3042 baseless addressing. */
3043 unsigned int modrm;
3044 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3045 if ((modrm & 0xc7) == 0x5)
3046 relocation += offplt;
3047 }
3048
3049 unresolved_reloc = FALSE;
3050 break;
3051
3052 case R_386_GOT32:
3053 r_386_got32:
3054 /* Relocation is to the entry for this symbol in the global
3055 offset table. */
3056 if (htab->elf.sgot == NULL)
3057 abort ();
3058
3059 relative_reloc = FALSE;
3060 if (h != NULL)
3061 {
3062 bfd_boolean dyn;
3063
3064 off = h->got.offset;
3065 dyn = htab->elf.dynamic_sections_created;
3066 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
3067 bfd_link_pic (info),
3068 h)
3069 || (bfd_link_pic (info)
3070 && SYMBOL_REFERENCES_LOCAL (info, h))
3071 || (ELF_ST_VISIBILITY (h->other)
3072 && h->root.type == bfd_link_hash_undefweak))
3073 {
3074 /* This is actually a static link, or it is a
3075 -Bsymbolic link and the symbol is defined
3076 locally, or the symbol was forced to be local
3077 because of a version file. We must initialize
3078 this entry in the global offset table. Since the
3079 offset must always be a multiple of 4, we use the
3080 least significant bit to record whether we have
3081 initialized it already.
3082
3083 When doing a dynamic link, we create a .rel.got
3084 relocation entry to initialize the value. This
3085 is done in the finish_dynamic_symbol routine. */
3086 if ((off & 1) != 0)
3087 off &= ~1;
3088 else
3089 {
3090 bfd_put_32 (output_bfd, relocation,
3091 htab->elf.sgot->contents + off);
3092 h->got.offset |= 1;
3093
3094 if (h->dynindx == -1
3095 && !h->forced_local
3096 && h->root.type != bfd_link_hash_undefweak
3097 && bfd_link_pic (info))
3098 {
3099 /* PR ld/21402: If this symbol isn't dynamic
3100 in PIC, generate R_386_RELATIVE here. */
3101 eh->no_finish_dynamic_symbol = 1;
3102 relative_reloc = TRUE;
3103 }
3104 }
3105 }
3106 else
3107 unresolved_reloc = FALSE;
3108 }
3109 else
3110 {
3111 if (local_got_offsets == NULL)
3112 abort ();
3113
3114 off = local_got_offsets[r_symndx];
3115
3116 /* The offset must always be a multiple of 4. We use
3117 the least significant bit to record whether we have
3118 already generated the necessary reloc. */
3119 if ((off & 1) != 0)
3120 off &= ~1;
3121 else
3122 {
3123 bfd_put_32 (output_bfd, relocation,
3124 htab->elf.sgot->contents + off);
3125 local_got_offsets[r_symndx] |= 1;
3126
3127 if (bfd_link_pic (info))
3128 relative_reloc = TRUE;
3129 }
3130 }
3131
3132 if (relative_reloc)
3133 {
3134 asection *s;
3135 Elf_Internal_Rela outrel;
3136
3137 s = htab->elf.srelgot;
3138 if (s == NULL)
3139 abort ();
3140
3141 outrel.r_offset = (htab->elf.sgot->output_section->vma
3142 + htab->elf.sgot->output_offset
3143 + off);
3144 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3145 elf_append_rel (output_bfd, s, &outrel);
3146 }
3147
3148 if (off >= (bfd_vma) -2)
3149 abort ();
3150
3151 relocation = (htab->elf.sgot->output_section->vma
3152 + htab->elf.sgot->output_offset + off);
3153 if (rel->r_offset > 1
3154 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
3155 && *(contents + rel->r_offset - 2) != 0x8d)
3156 {
3157 if (bfd_link_pic (info))
3158 {
3159 /* For PIC, disallow R_386_GOT32 without a base
3160 register, except for "lea foo@GOT, %reg", since
3161 we don't know what the GOT base is. */
3162 const char *name;
3163
3164 disallow_got32:
3165 if (h == NULL || h->root.root.string == NULL)
3166 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3167 NULL);
3168 else
3169 name = h->root.root.string;
3170
3171 _bfd_error_handler
3172 /* xgettext:c-format */
3173 (_("%B: direct GOT relocation %s against `%s'"
3174 " without base register can not be used"
3175 " when making a shared object"),
3176 input_bfd, howto->name, name);
3177 bfd_set_error (bfd_error_bad_value);
3178 return FALSE;
3179 }
3180 }
3181 else
3182 {
3183 /* Subtract the .got.plt section address only with a base
3184 register. */
3185 relocation -= (htab->elf.sgotplt->output_section->vma
3186 + htab->elf.sgotplt->output_offset);
3187 }
3188
3189 break;
3190
3191 case R_386_GOTOFF:
3192 /* Relocation is relative to the start of the global offset
3193 table. */
3194
3195 /* Check to make sure it isn't a protected function or data
3196 symbol for shared library since it may not be local when
3197 used as function address or with copy relocation. We also
3198 need to make sure that a symbol is referenced locally. */
3199 if (!bfd_link_executable (info) && h)
3200 {
3201 if (!h->def_regular)
3202 {
3203 const char *v;
3204
3205 switch (ELF_ST_VISIBILITY (h->other))
3206 {
3207 case STV_HIDDEN:
3208 v = _("hidden symbol");
3209 break;
3210 case STV_INTERNAL:
3211 v = _("internal symbol");
3212 break;
3213 case STV_PROTECTED:
3214 v = _("protected symbol");
3215 break;
3216 default:
3217 v = _("symbol");
3218 break;
3219 }
3220
3221 _bfd_error_handler
3222 /* xgettext:c-format */
3223 (_("%B: relocation R_386_GOTOFF against undefined %s"
3224 " `%s' can not be used when making a shared object"),
3225 input_bfd, v, h->root.root.string);
3226 bfd_set_error (bfd_error_bad_value);
3227 return FALSE;
3228 }
3229 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
3230 && (h->type == STT_FUNC
3231 || h->type == STT_OBJECT)
3232 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3233 {
3234 _bfd_error_handler
3235 /* xgettext:c-format */
3236 (_("%B: relocation R_386_GOTOFF against protected %s"
3237 " `%s' can not be used when making a shared object"),
3238 input_bfd,
3239 h->type == STT_FUNC ? "function" : "data",
3240 h->root.root.string);
3241 bfd_set_error (bfd_error_bad_value);
3242 return FALSE;
3243 }
3244 }
3245
3246 /* Note that sgot is not involved in this
3247 calculation. We always want the start of .got.plt. If we
3248 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3249 permitted by the ABI, we might have to change this
3250 calculation. */
3251 relocation -= htab->elf.sgotplt->output_section->vma
3252 + htab->elf.sgotplt->output_offset;
3253 break;
3254
3255 case R_386_GOTPC:
3256 /* Use global offset table as symbol value. */
3257 relocation = htab->elf.sgotplt->output_section->vma
3258 + htab->elf.sgotplt->output_offset;
3259 unresolved_reloc = FALSE;
3260 break;
3261
3262 case R_386_PLT32:
3263 /* Relocation is to the entry for this symbol in the
3264 procedure linkage table. */
3265
3266 /* Resolve a PLT32 reloc against a local symbol directly,
3267 without using the procedure linkage table. */
3268 if (h == NULL)
3269 break;
3270
3271 if ((h->plt.offset == (bfd_vma) -1
3272 && eh->plt_got.offset == (bfd_vma) -1)
3273 || htab->elf.splt == NULL)
3274 {
3275 /* We didn't make a PLT entry for this symbol. This
3276 happens when statically linking PIC code, or when
3277 using -Bsymbolic. */
3278 break;
3279 }
3280
3281 if (h->plt.offset != (bfd_vma) -1)
3282 {
3283 if (htab->plt_second != NULL)
3284 {
3285 resolved_plt = htab->plt_second;
3286 plt_offset = eh->plt_second.offset;
3287 }
3288 else
3289 {
3290 resolved_plt = htab->elf.splt;
3291 plt_offset = h->plt.offset;
3292 }
3293 }
3294 else
3295 {
3296 resolved_plt = htab->plt_got;
3297 plt_offset = eh->plt_got.offset;
3298 }
3299
3300 relocation = (resolved_plt->output_section->vma
3301 + resolved_plt->output_offset
3302 + plt_offset);
3303 unresolved_reloc = FALSE;
3304 break;
3305
3306 case R_386_SIZE32:
3307 /* Set to symbol size. */
3308 relocation = st_size;
3309 /* Fall through. */
3310
3311 case R_386_32:
3312 case R_386_PC32:
3313 if ((input_section->flags & SEC_ALLOC) == 0
3314 || is_vxworks_tls)
3315 break;
3316
3317 /* Copy dynamic function pointer relocations. Don't generate
3318 dynamic relocations against resolved undefined weak symbols
3319 in PIE, except for R_386_PC32. */
3320 if ((bfd_link_pic (info)
3321 && (h == NULL
3322 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3323 && (!resolved_to_zero
3324 || r_type == R_386_PC32))
3325 || h->root.type != bfd_link_hash_undefweak))
3326 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3327 || !SYMBOL_CALLS_LOCAL (info, h)))
3328 || (ELIMINATE_COPY_RELOCS
3329 && !bfd_link_pic (info)
3330 && h != NULL
3331 && h->dynindx != -1
3332 && (!h->non_got_ref
3333 || eh->func_pointer_refcount > 0
3334 || (h->root.type == bfd_link_hash_undefweak
3335 && !resolved_to_zero))
3336 && ((h->def_dynamic && !h->def_regular)
3337 /* Undefined weak symbol is bound locally when
3338 PIC is false. */
3339 || h->root.type == bfd_link_hash_undefweak)))
3340 {
3341 Elf_Internal_Rela outrel;
3342 bfd_boolean skip, relocate;
3343 asection *sreloc;
3344
3345 /* When generating a shared object, these relocations
3346 are copied into the output file to be resolved at run
3347 time. */
3348
3349 skip = FALSE;
3350 relocate = FALSE;
3351
3352 outrel.r_offset =
3353 _bfd_elf_section_offset (output_bfd, info, input_section,
3354 rel->r_offset);
3355 if (outrel.r_offset == (bfd_vma) -1)
3356 skip = TRUE;
3357 else if (outrel.r_offset == (bfd_vma) -2)
3358 skip = TRUE, relocate = TRUE;
3359 outrel.r_offset += (input_section->output_section->vma
3360 + input_section->output_offset);
3361
3362 if (skip)
3363 memset (&outrel, 0, sizeof outrel);
3364 else if (h != NULL
3365 && h->dynindx != -1
3366 && (r_type == R_386_PC32
3367 || !(bfd_link_executable (info)
3368 || SYMBOLIC_BIND (info, h))
3369 || !h->def_regular))
3370 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3371 else
3372 {
3373 /* This symbol is local, or marked to become local. */
3374 relocate = TRUE;
3375 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3376 }
3377
3378 sreloc = elf_section_data (input_section)->sreloc;
3379
3380 if (sreloc == NULL || sreloc->contents == NULL)
3381 {
3382 r = bfd_reloc_notsupported;
3383 goto check_relocation_error;
3384 }
3385
3386 elf_append_rel (output_bfd, sreloc, &outrel);
3387
3388 /* If this reloc is against an external symbol, we do
3389 not want to fiddle with the addend. Otherwise, we
3390 need to include the symbol value so that it becomes
3391 an addend for the dynamic reloc. */
3392 if (! relocate)
3393 continue;
3394 }
3395 break;
3396
3397 case R_386_TLS_IE:
3398 if (!bfd_link_executable (info))
3399 {
3400 Elf_Internal_Rela outrel;
3401 asection *sreloc;
3402
3403 outrel.r_offset = rel->r_offset
3404 + input_section->output_section->vma
3405 + input_section->output_offset;
3406 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3407 sreloc = elf_section_data (input_section)->sreloc;
3408 if (sreloc == NULL)
3409 abort ();
3410 elf_append_rel (output_bfd, sreloc, &outrel);
3411 }
3412 /* Fall through */
3413
3414 case R_386_TLS_GD:
3415 case R_386_TLS_GOTDESC:
3416 case R_386_TLS_DESC_CALL:
3417 case R_386_TLS_IE_32:
3418 case R_386_TLS_GOTIE:
3419 tls_type = GOT_UNKNOWN;
3420 if (h == NULL && local_got_offsets)
3421 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
3422 else if (h != NULL)
3423 tls_type = elf_x86_hash_entry(h)->tls_type;
3424 if (tls_type == GOT_TLS_IE)
3425 tls_type = GOT_TLS_IE_NEG;
3426
3427 if (! elf_i386_tls_transition (info, input_bfd,
3428 input_section, contents,
3429 symtab_hdr, sym_hashes,
3430 &r_type, tls_type, rel,
3431 relend, h, r_symndx, TRUE))
3432 return FALSE;
3433
3434 if (r_type == R_386_TLS_LE_32)
3435 {
3436 BFD_ASSERT (! unresolved_reloc);
3437 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3438 {
3439 unsigned int type;
3440 bfd_vma roff;
3441
3442 /* GD->LE transition. */
3443 type = *(contents + rel->r_offset - 2);
3444 if (type == 0x04)
3445 {
3446 /* Change
3447 leal foo@tlsgd(,%ebx,1), %eax
3448 call ___tls_get_addr@PLT
3449 into:
3450 movl %gs:0, %eax
3451 subl $foo@tpoff, %eax
3452 (6 byte form of subl). */
3453 roff = rel->r_offset + 5;
3454 }
3455 else
3456 {
3457 /* Change
3458 leal foo@tlsgd(%ebx), %eax
3459 call ___tls_get_addr@PLT
3460 nop
3461 or
3462 leal foo@tlsgd(%reg), %eax
3463 call *___tls_get_addr@GOT(%reg)
3464 which may be converted to
3465 addr32 call ___tls_get_addr
3466 into:
3467 movl %gs:0, %eax; subl $foo@tpoff, %eax
3468 (6 byte form of subl). */
3469 roff = rel->r_offset + 6;
3470 }
3471 memcpy (contents + roff - 8,
3472 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3473 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3474 contents + roff);
3475 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
3476 rel++;
3477 wrel++;
3478 continue;
3479 }
3480 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3481 {
3482 /* GDesc -> LE transition.
3483 It's originally something like:
3484 leal x@tlsdesc(%ebx), %eax
3485
3486 leal x@ntpoff, %eax
3487
3488 Registers other than %eax may be set up here. */
3489
3490 unsigned int val;
3491 bfd_vma roff;
3492
3493 roff = rel->r_offset;
3494 val = bfd_get_8 (input_bfd, contents + roff - 1);
3495
3496 /* Now modify the instruction as appropriate. */
3497 /* aoliva FIXME: remove the above and xor the byte
3498 below with 0x86. */
3499 bfd_put_8 (output_bfd, val ^ 0x86,
3500 contents + roff - 1);
3501 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3502 contents + roff);
3503 continue;
3504 }
3505 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3506 {
3507 /* GDesc -> LE transition.
3508 It's originally:
3509 call *(%eax)
3510 Turn it into:
3511 xchg %ax,%ax */
3512
3513 bfd_vma roff;
3514
3515 roff = rel->r_offset;
3516 bfd_put_8 (output_bfd, 0x66, contents + roff);
3517 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3518 continue;
3519 }
3520 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3521 {
3522 unsigned int val;
3523
3524 /* IE->LE transition:
3525 Originally it can be one of:
3526 movl foo, %eax
3527 movl foo, %reg
3528 addl foo, %reg
3529 We change it into:
3530 movl $foo, %eax
3531 movl $foo, %reg
3532 addl $foo, %reg. */
3533 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3534 if (val == 0xa1)
3535 {
3536 /* movl foo, %eax. */
3537 bfd_put_8 (output_bfd, 0xb8,
3538 contents + rel->r_offset - 1);
3539 }
3540 else
3541 {
3542 unsigned int type;
3543
3544 type = bfd_get_8 (input_bfd,
3545 contents + rel->r_offset - 2);
3546 switch (type)
3547 {
3548 case 0x8b:
3549 /* movl */
3550 bfd_put_8 (output_bfd, 0xc7,
3551 contents + rel->r_offset - 2);
3552 bfd_put_8 (output_bfd,
3553 0xc0 | ((val >> 3) & 7),
3554 contents + rel->r_offset - 1);
3555 break;
3556 case 0x03:
3557 /* addl */
3558 bfd_put_8 (output_bfd, 0x81,
3559 contents + rel->r_offset - 2);
3560 bfd_put_8 (output_bfd,
3561 0xc0 | ((val >> 3) & 7),
3562 contents + rel->r_offset - 1);
3563 break;
3564 default:
3565 BFD_FAIL ();
3566 break;
3567 }
3568 }
3569 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3570 contents + rel->r_offset);
3571 continue;
3572 }
3573 else
3574 {
3575 unsigned int val, type;
3576
3577 /* {IE_32,GOTIE}->LE transition:
3578 Originally it can be one of:
3579 subl foo(%reg1), %reg2
3580 movl foo(%reg1), %reg2
3581 addl foo(%reg1), %reg2
3582 We change it into:
3583 subl $foo, %reg2
3584 movl $foo, %reg2 (6 byte form)
3585 addl $foo, %reg2. */
3586 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3587 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3588 if (type == 0x8b)
3589 {
3590 /* movl */
3591 bfd_put_8 (output_bfd, 0xc7,
3592 contents + rel->r_offset - 2);
3593 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3594 contents + rel->r_offset - 1);
3595 }
3596 else if (type == 0x2b)
3597 {
3598 /* subl */
3599 bfd_put_8 (output_bfd, 0x81,
3600 contents + rel->r_offset - 2);
3601 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3602 contents + rel->r_offset - 1);
3603 }
3604 else if (type == 0x03)
3605 {
3606 /* addl */
3607 bfd_put_8 (output_bfd, 0x81,
3608 contents + rel->r_offset - 2);
3609 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3610 contents + rel->r_offset - 1);
3611 }
3612 else
3613 BFD_FAIL ();
3614 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3615 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3616 contents + rel->r_offset);
3617 else
3618 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3619 contents + rel->r_offset);
3620 continue;
3621 }
3622 }
3623
3624 if (htab->elf.sgot == NULL)
3625 abort ();
3626
3627 if (h != NULL)
3628 {
3629 off = h->got.offset;
3630 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3631 }
3632 else
3633 {
3634 if (local_got_offsets == NULL)
3635 abort ();
3636
3637 off = local_got_offsets[r_symndx];
3638 offplt = local_tlsdesc_gotents[r_symndx];
3639 }
3640
3641 if ((off & 1) != 0)
3642 off &= ~1;
3643 else
3644 {
3645 Elf_Internal_Rela outrel;
3646 int dr_type;
3647 asection *sreloc;
3648
3649 if (htab->elf.srelgot == NULL)
3650 abort ();
3651
3652 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3653
3654 if (GOT_TLS_GDESC_P (tls_type))
3655 {
3656 bfd_byte *loc;
3657 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3658 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3659 <= htab->elf.sgotplt->size);
3660 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3661 + htab->elf.sgotplt->output_offset
3662 + offplt
3663 + htab->sgotplt_jump_table_size);
3664 sreloc = htab->elf.srelplt;
3665 loc = sreloc->contents;
3666 loc += (htab->next_tls_desc_index++
3667 * sizeof (Elf32_External_Rel));
3668 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3669 <= sreloc->contents + sreloc->size);
3670 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3671 if (indx == 0)
3672 {
3673 BFD_ASSERT (! unresolved_reloc);
3674 bfd_put_32 (output_bfd,
3675 relocation - _bfd_x86_elf_dtpoff_base (info),
3676 htab->elf.sgotplt->contents + offplt
3677 + htab->sgotplt_jump_table_size + 4);
3678 }
3679 else
3680 {
3681 bfd_put_32 (output_bfd, 0,
3682 htab->elf.sgotplt->contents + offplt
3683 + htab->sgotplt_jump_table_size + 4);
3684 }
3685 }
3686
3687 sreloc = htab->elf.srelgot;
3688
3689 outrel.r_offset = (htab->elf.sgot->output_section->vma
3690 + htab->elf.sgot->output_offset + off);
3691
3692 if (GOT_TLS_GD_P (tls_type))
3693 dr_type = R_386_TLS_DTPMOD32;
3694 else if (GOT_TLS_GDESC_P (tls_type))
3695 goto dr_done;
3696 else if (tls_type == GOT_TLS_IE_POS)
3697 dr_type = R_386_TLS_TPOFF;
3698 else
3699 dr_type = R_386_TLS_TPOFF32;
3700
3701 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3702 bfd_put_32 (output_bfd,
3703 relocation - _bfd_x86_elf_dtpoff_base (info),
3704 htab->elf.sgot->contents + off);
3705 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3706 bfd_put_32 (output_bfd,
3707 _bfd_x86_elf_dtpoff_base (info) - relocation,
3708 htab->elf.sgot->contents + off);
3709 else if (dr_type != R_386_TLS_DESC)
3710 bfd_put_32 (output_bfd, 0,
3711 htab->elf.sgot->contents + off);
3712 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3713
3714 elf_append_rel (output_bfd, sreloc, &outrel);
3715
3716 if (GOT_TLS_GD_P (tls_type))
3717 {
3718 if (indx == 0)
3719 {
3720 BFD_ASSERT (! unresolved_reloc);
3721 bfd_put_32 (output_bfd,
3722 relocation - _bfd_x86_elf_dtpoff_base (info),
3723 htab->elf.sgot->contents + off + 4);
3724 }
3725 else
3726 {
3727 bfd_put_32 (output_bfd, 0,
3728 htab->elf.sgot->contents + off + 4);
3729 outrel.r_info = ELF32_R_INFO (indx,
3730 R_386_TLS_DTPOFF32);
3731 outrel.r_offset += 4;
3732 elf_append_rel (output_bfd, sreloc, &outrel);
3733 }
3734 }
3735 else if (tls_type == GOT_TLS_IE_BOTH)
3736 {
3737 bfd_put_32 (output_bfd,
3738 (indx == 0
3739 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3740 : 0),
3741 htab->elf.sgot->contents + off + 4);
3742 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3743 outrel.r_offset += 4;
3744 elf_append_rel (output_bfd, sreloc, &outrel);
3745 }
3746
3747 dr_done:
3748 if (h != NULL)
3749 h->got.offset |= 1;
3750 else
3751 local_got_offsets[r_symndx] |= 1;
3752 }
3753
3754 if (off >= (bfd_vma) -2
3755 && ! GOT_TLS_GDESC_P (tls_type))
3756 abort ();
3757 if (r_type == R_386_TLS_GOTDESC
3758 || r_type == R_386_TLS_DESC_CALL)
3759 {
3760 relocation = htab->sgotplt_jump_table_size + offplt;
3761 unresolved_reloc = FALSE;
3762 }
3763 else if (r_type == ELF32_R_TYPE (rel->r_info))
3764 {
3765 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3766 + htab->elf.sgotplt->output_offset;
3767 relocation = htab->elf.sgot->output_section->vma
3768 + htab->elf.sgot->output_offset + off - g_o_t;
3769 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3770 && tls_type == GOT_TLS_IE_BOTH)
3771 relocation += 4;
3772 if (r_type == R_386_TLS_IE)
3773 relocation += g_o_t;
3774 unresolved_reloc = FALSE;
3775 }
3776 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3777 {
3778 unsigned int val, type;
3779 bfd_vma roff;
3780
3781 /* GD->IE transition. */
3782 type = *(contents + rel->r_offset - 2);
3783 val = *(contents + rel->r_offset - 1);
3784 if (type == 0x04)
3785 {
3786 /* Change
3787 leal foo@tlsgd(,%ebx,1), %eax
3788 call ___tls_get_addr@PLT
3789 into:
3790 movl %gs:0, %eax
3791 subl $foo@gottpoff(%ebx), %eax. */
3792 val >>= 3;
3793 roff = rel->r_offset - 3;
3794 }
3795 else
3796 {
3797 /* Change
3798 leal foo@tlsgd(%ebx), %eax
3799 call ___tls_get_addr@PLT
3800 nop
3801 or
3802 leal foo@tlsgd(%reg), %eax
3803 call *___tls_get_addr@GOT(%reg)
3804 which may be converted to
3805 addr32 call ___tls_get_addr
3806 into:
3807 movl %gs:0, %eax;
3808 subl $foo@gottpoff(%reg), %eax. */
3809 roff = rel->r_offset - 2;
3810 }
3811 memcpy (contents + roff,
3812 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3813 contents[roff + 7] = 0x80 | (val & 7);
3814 /* If foo is used only with foo@gotntpoff(%reg) and
3815 foo@indntpoff, but not with foo@gottpoff(%reg), change
3816 subl $foo@gottpoff(%reg), %eax
3817 into:
3818 addl $foo@gotntpoff(%reg), %eax. */
3819 if (tls_type == GOT_TLS_IE_POS)
3820 contents[roff + 6] = 0x03;
3821 bfd_put_32 (output_bfd,
3822 htab->elf.sgot->output_section->vma
3823 + htab->elf.sgot->output_offset + off
3824 - htab->elf.sgotplt->output_section->vma
3825 - htab->elf.sgotplt->output_offset,
3826 contents + roff + 8);
3827 /* Skip R_386_PLT32 and R_386_GOT32X. */
3828 rel++;
3829 wrel++;
3830 continue;
3831 }
3832 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3833 {
3834 /* GDesc -> IE transition.
3835 It's originally something like:
3836 leal x@tlsdesc(%ebx), %eax
3837
3838 Change it to:
3839 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3840 or:
3841 movl x@gottpoff(%ebx), %eax # before negl %eax
3842
3843 Registers other than %eax may be set up here. */
3844
3845 bfd_vma roff;
3846
3847 /* First, make sure it's a leal adding ebx to a 32-bit
3848 offset into any register, although it's probably
3849 almost always going to be eax. */
3850 roff = rel->r_offset;
3851
3852 /* Now modify the instruction as appropriate. */
3853 /* To turn a leal into a movl in the form we use it, it
3854 suffices to change the first byte from 0x8d to 0x8b.
3855 aoliva FIXME: should we decide to keep the leal, all
3856 we have to do is remove the statement below, and
3857 adjust the relaxation of R_386_TLS_DESC_CALL. */
3858 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3859
3860 if (tls_type == GOT_TLS_IE_BOTH)
3861 off += 4;
3862
3863 bfd_put_32 (output_bfd,
3864 htab->elf.sgot->output_section->vma
3865 + htab->elf.sgot->output_offset + off
3866 - htab->elf.sgotplt->output_section->vma
3867 - htab->elf.sgotplt->output_offset,
3868 contents + roff);
3869 continue;
3870 }
3871 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3872 {
3873 /* GDesc -> IE transition.
3874 It's originally:
3875 call *(%eax)
3876
3877 Change it to:
3878 xchg %ax,%ax
3879 or
3880 negl %eax
3881 depending on how we transformed the TLS_GOTDESC above.
3882 */
3883
3884 bfd_vma roff;
3885
3886 roff = rel->r_offset;
3887
3888 /* Now modify the instruction as appropriate. */
3889 if (tls_type != GOT_TLS_IE_NEG)
3890 {
3891 /* xchg %ax,%ax */
3892 bfd_put_8 (output_bfd, 0x66, contents + roff);
3893 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3894 }
3895 else
3896 {
3897 /* negl %eax */
3898 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3899 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3900 }
3901
3902 continue;
3903 }
3904 else
3905 BFD_ASSERT (FALSE);
3906 break;
3907
3908 case R_386_TLS_LDM:
3909 if (! elf_i386_tls_transition (info, input_bfd,
3910 input_section, contents,
3911 symtab_hdr, sym_hashes,
3912 &r_type, GOT_UNKNOWN, rel,
3913 relend, h, r_symndx, TRUE))
3914 return FALSE;
3915
3916 if (r_type != R_386_TLS_LDM)
3917 {
3918 /* LD->LE transition. Change
3919 leal foo@tlsldm(%ebx) %eax
3920 call ___tls_get_addr@PLT
3921 into:
3922 movl %gs:0, %eax
3923 nop
3924 leal 0(%esi,1), %esi
3925 or change
3926 leal foo@tlsldm(%reg) %eax
3927 call *___tls_get_addr@GOT(%reg)
3928 which may be converted to
3929 addr32 call ___tls_get_addr
3930 into:
3931 movl %gs:0, %eax
3932 leal 0(%esi), %esi */
3933 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3934 if (*(contents + rel->r_offset + 4) == 0xff
3935 || *(contents + rel->r_offset + 4) == 0x67)
3936 memcpy (contents + rel->r_offset - 2,
3937 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3938 else
3939 memcpy (contents + rel->r_offset - 2,
3940 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3941 /* Skip R_386_PC32/R_386_PLT32. */
3942 rel++;
3943 wrel++;
3944 continue;
3945 }
3946
3947 if (htab->elf.sgot == NULL)
3948 abort ();
3949
3950 off = htab->tls_ld_or_ldm_got.offset;
3951 if (off & 1)
3952 off &= ~1;
3953 else
3954 {
3955 Elf_Internal_Rela outrel;
3956
3957 if (htab->elf.srelgot == NULL)
3958 abort ();
3959
3960 outrel.r_offset = (htab->elf.sgot->output_section->vma
3961 + htab->elf.sgot->output_offset + off);
3962
3963 bfd_put_32 (output_bfd, 0,
3964 htab->elf.sgot->contents + off);
3965 bfd_put_32 (output_bfd, 0,
3966 htab->elf.sgot->contents + off + 4);
3967 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3968 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3969 htab->tls_ld_or_ldm_got.offset |= 1;
3970 }
3971 relocation = htab->elf.sgot->output_section->vma
3972 + htab->elf.sgot->output_offset + off
3973 - htab->elf.sgotplt->output_section->vma
3974 - htab->elf.sgotplt->output_offset;
3975 unresolved_reloc = FALSE;
3976 break;
3977
3978 case R_386_TLS_LDO_32:
3979 if (!bfd_link_executable (info)
3980 || (input_section->flags & SEC_CODE) == 0)
3981 relocation -= _bfd_x86_elf_dtpoff_base (info);
3982 else
3983 /* When converting LDO to LE, we must negate. */
3984 relocation = -elf_i386_tpoff (info, relocation);
3985 break;
3986
3987 case R_386_TLS_LE_32:
3988 case R_386_TLS_LE:
3989 if (!bfd_link_executable (info))
3990 {
3991 Elf_Internal_Rela outrel;
3992 asection *sreloc;
3993
3994 outrel.r_offset = rel->r_offset
3995 + input_section->output_section->vma
3996 + input_section->output_offset;
3997 if (h != NULL && h->dynindx != -1)
3998 indx = h->dynindx;
3999 else
4000 indx = 0;
4001 if (r_type == R_386_TLS_LE_32)
4002 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4003 else
4004 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4005 sreloc = elf_section_data (input_section)->sreloc;
4006 if (sreloc == NULL)
4007 abort ();
4008 elf_append_rel (output_bfd, sreloc, &outrel);
4009 if (indx)
4010 continue;
4011 else if (r_type == R_386_TLS_LE_32)
4012 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
4013 else
4014 relocation -= _bfd_x86_elf_dtpoff_base (info);
4015 }
4016 else if (r_type == R_386_TLS_LE_32)
4017 relocation = elf_i386_tpoff (info, relocation);
4018 else
4019 relocation = -elf_i386_tpoff (info, relocation);
4020 break;
4021
4022 default:
4023 break;
4024 }
4025
4026 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4027 because such sections are not SEC_ALLOC and thus ld.so will
4028 not process them. */
4029 if (unresolved_reloc
4030 && !((input_section->flags & SEC_DEBUGGING) != 0
4031 && h->def_dynamic)
4032 && _bfd_elf_section_offset (output_bfd, info, input_section,
4033 rel->r_offset) != (bfd_vma) -1)
4034 {
4035 _bfd_error_handler
4036 /* xgettext:c-format */
4037 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
4038 input_bfd,
4039 input_section,
4040 rel->r_offset,
4041 howto->name,
4042 h->root.root.string);
4043 return FALSE;
4044 }
4045
4046 do_relocation:
4047 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4048 contents, rel->r_offset,
4049 relocation, 0);
4050
4051 check_relocation_error:
4052 if (r != bfd_reloc_ok)
4053 {
4054 const char *name;
4055
4056 if (h != NULL)
4057 name = h->root.root.string;
4058 else
4059 {
4060 name = bfd_elf_string_from_elf_section (input_bfd,
4061 symtab_hdr->sh_link,
4062 sym->st_name);
4063 if (name == NULL)
4064 return FALSE;
4065 if (*name == '\0')
4066 name = bfd_section_name (input_bfd, sec);
4067 }
4068
4069 if (r == bfd_reloc_overflow)
4070 (*info->callbacks->reloc_overflow)
4071 (info, (h ? &h->root : NULL), name, howto->name,
4072 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
4073 else
4074 {
4075 _bfd_error_handler
4076 /* xgettext:c-format */
4077 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
4078 input_bfd, input_section,
4079 rel->r_offset, name, (int) r);
4080 return FALSE;
4081 }
4082 }
4083
4084 if (wrel != rel)
4085 *wrel = *rel;
4086 }
4087
4088 if (wrel != rel)
4089 {
4090 Elf_Internal_Shdr *rel_hdr;
4091 size_t deleted = rel - wrel;
4092
4093 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
4094 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4095 if (rel_hdr->sh_size == 0)
4096 {
4097 /* It is too late to remove an empty reloc section. Leave
4098 one NONE reloc.
4099 ??? What is wrong with an empty section??? */
4100 rel_hdr->sh_size = rel_hdr->sh_entsize;
4101 deleted -= 1;
4102 }
4103 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
4104 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4105 input_section->reloc_count -= deleted;
4106 }
4107
4108 return TRUE;
4109 }
4110
4111 /* Finish up dynamic symbol handling. We set the contents of various
4112 dynamic sections here. */
4113
4114 static bfd_boolean
4115 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4116 struct bfd_link_info *info,
4117 struct elf_link_hash_entry *h,
4118 Elf_Internal_Sym *sym)
4119 {
4120 struct elf_x86_link_hash_table *htab;
4121 unsigned plt_entry_size;
4122 struct elf_x86_link_hash_entry *eh;
4123 bfd_boolean local_undefweak;
4124 bfd_boolean use_plt_second;
4125
4126 htab = elf_x86_hash_table (info, I386_ELF_DATA);
4127 if (htab == NULL)
4128 return FALSE;
4129
4130 plt_entry_size = htab->plt.plt_entry_size;
4131
4132 /* Use the second PLT section only if there is .plt section. */
4133 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
4134
4135 eh = (struct elf_x86_link_hash_entry *) h;
4136 if (eh->no_finish_dynamic_symbol)
4137 abort ();
4138
4139 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4140 resolved undefined weak symbols in executable so that their
4141 references have value 0 at run-time. */
4142 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, I386_ELF_DATA,
4143 eh->has_got_reloc,
4144 eh);
4145
4146 if (h->plt.offset != (bfd_vma) -1)
4147 {
4148 bfd_vma plt_index, plt_offset;
4149 bfd_vma got_offset;
4150 Elf_Internal_Rela rel;
4151 bfd_byte *loc;
4152 asection *plt, *resolved_plt, *gotplt, *relplt;
4153
4154 /* When building a static executable, use .iplt, .igot.plt and
4155 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4156 if (htab->elf.splt != NULL)
4157 {
4158 plt = htab->elf.splt;
4159 gotplt = htab->elf.sgotplt;
4160 relplt = htab->elf.srelplt;
4161 }
4162 else
4163 {
4164 plt = htab->elf.iplt;
4165 gotplt = htab->elf.igotplt;
4166 relplt = htab->elf.irelplt;
4167 }
4168
4169 /* This symbol has an entry in the procedure linkage table. Set
4170 it up. */
4171
4172 if ((h->dynindx == -1
4173 && !local_undefweak
4174 && !((h->forced_local || bfd_link_executable (info))
4175 && h->def_regular
4176 && h->type == STT_GNU_IFUNC))
4177 || plt == NULL
4178 || gotplt == NULL
4179 || relplt == NULL)
4180 abort ();
4181
4182 /* Get the index in the procedure linkage table which
4183 corresponds to this symbol. This is the index of this symbol
4184 in all the symbols for which we are making plt entries. The
4185 first entry in the procedure linkage table is reserved.
4186
4187 Get the offset into the .got table of the entry that
4188 corresponds to this function. Each .got entry is 4 bytes.
4189 The first three are reserved.
4190
4191 For static executables, we don't reserve anything. */
4192
4193 if (plt == htab->elf.splt)
4194 {
4195 got_offset = (h->plt.offset / plt_entry_size
4196 - htab->plt.has_plt0);
4197 got_offset = (got_offset + 3) * 4;
4198 }
4199 else
4200 {
4201 got_offset = h->plt.offset / plt_entry_size;
4202 got_offset = got_offset * 4;
4203 }
4204
4205 /* Fill in the entry in the procedure linkage table and update
4206 the first slot. */
4207 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
4208 plt_entry_size);
4209
4210 if (use_plt_second)
4211 {
4212 const bfd_byte *plt_entry;
4213 if (bfd_link_pic (info))
4214 plt_entry = htab->non_lazy_plt->pic_plt_entry;
4215 else
4216 plt_entry = htab->non_lazy_plt->plt_entry;
4217 memcpy (htab->plt_second->contents + eh->plt_second.offset,
4218 plt_entry, htab->non_lazy_plt->plt_entry_size);
4219
4220 resolved_plt = htab->plt_second;
4221 plt_offset = eh->plt_second.offset;
4222 }
4223 else
4224 {
4225 resolved_plt = plt;
4226 plt_offset = h->plt.offset;
4227 }
4228
4229 if (! bfd_link_pic (info))
4230 {
4231 bfd_put_32 (output_bfd,
4232 (gotplt->output_section->vma
4233 + gotplt->output_offset
4234 + got_offset),
4235 resolved_plt->contents + plt_offset
4236 + htab->plt.plt_got_offset);
4237
4238 if (htab->is_vxworks)
4239 {
4240 int s, k, reloc_index;
4241
4242 /* Create the R_386_32 relocation referencing the GOT
4243 for this PLT entry. */
4244
4245 /* S: Current slot number (zero-based). */
4246 s = ((h->plt.offset - htab->plt.plt_entry_size)
4247 / htab->plt.plt_entry_size);
4248 /* K: Number of relocations for PLTResolve. */
4249 if (bfd_link_pic (info))
4250 k = PLTRESOLVE_RELOCS_SHLIB;
4251 else
4252 k = PLTRESOLVE_RELOCS;
4253 /* Skip the PLTresolve relocations, and the relocations for
4254 the other PLT slots. */
4255 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4256 loc = (htab->srelplt2->contents + reloc_index
4257 * sizeof (Elf32_External_Rel));
4258
4259 rel.r_offset = (plt->output_section->vma
4260 + plt->output_offset
4261 + h->plt.offset + 2),
4262 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4263 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4264
4265 /* Create the R_386_32 relocation referencing the beginning of
4266 the PLT for this GOT entry. */
4267 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4268 + htab->elf.sgotplt->output_offset
4269 + got_offset);
4270 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4271 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4272 loc + sizeof (Elf32_External_Rel));
4273 }
4274 }
4275 else
4276 {
4277 bfd_put_32 (output_bfd, got_offset,
4278 resolved_plt->contents + plt_offset
4279 + htab->plt.plt_got_offset);
4280 }
4281
4282 /* Fill in the entry in the global offset table. Leave the entry
4283 as zero for undefined weak symbol in PIE. No PLT relocation
4284 against undefined weak symbol in PIE. */
4285 if (!local_undefweak)
4286 {
4287 if (htab->plt.has_plt0)
4288 bfd_put_32 (output_bfd,
4289 (plt->output_section->vma
4290 + plt->output_offset
4291 + h->plt.offset
4292 + htab->lazy_plt->plt_lazy_offset),
4293 gotplt->contents + got_offset);
4294
4295 /* Fill in the entry in the .rel.plt section. */
4296 rel.r_offset = (gotplt->output_section->vma
4297 + gotplt->output_offset
4298 + got_offset);
4299 if (h->dynindx == -1
4300 || ((bfd_link_executable (info)
4301 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4302 && h->def_regular
4303 && h->type == STT_GNU_IFUNC))
4304 {
4305 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4306 h->root.root.string,
4307 h->root.u.def.section->owner);
4308
4309 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4310 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4311 in the .got.plt section. */
4312 bfd_put_32 (output_bfd,
4313 (h->root.u.def.value
4314 + h->root.u.def.section->output_section->vma
4315 + h->root.u.def.section->output_offset),
4316 gotplt->contents + got_offset);
4317 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4318 /* R_386_IRELATIVE comes last. */
4319 plt_index = htab->next_irelative_index--;
4320 }
4321 else
4322 {
4323 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4324 plt_index = htab->next_jump_slot_index++;
4325 }
4326
4327 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4328 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4329
4330 /* Don't fill the second and third slots in PLT entry for
4331 static executables nor without PLT0. */
4332 if (plt == htab->elf.splt && htab->plt.has_plt0)
4333 {
4334 bfd_put_32 (output_bfd,
4335 plt_index * sizeof (Elf32_External_Rel),
4336 plt->contents + h->plt.offset
4337 + htab->lazy_plt->plt_reloc_offset);
4338 bfd_put_32 (output_bfd,
4339 - (h->plt.offset
4340 + htab->lazy_plt->plt_plt_offset + 4),
4341 (plt->contents + h->plt.offset
4342 + htab->lazy_plt->plt_plt_offset));
4343 }
4344 }
4345 }
4346 else if (eh->plt_got.offset != (bfd_vma) -1)
4347 {
4348 bfd_vma got_offset, plt_offset;
4349 asection *plt, *got, *gotplt;
4350 const bfd_byte *got_plt_entry;
4351
4352 /* Set the entry in the GOT procedure linkage table. */
4353 plt = htab->plt_got;
4354 got = htab->elf.sgot;
4355 gotplt = htab->elf.sgotplt;
4356 got_offset = h->got.offset;
4357
4358 if (got_offset == (bfd_vma) -1
4359 || plt == NULL
4360 || got == NULL
4361 || gotplt == NULL)
4362 abort ();
4363
4364 /* Fill in the entry in the GOT procedure linkage table. */
4365 if (! bfd_link_pic (info))
4366 {
4367 got_plt_entry = htab->non_lazy_plt->plt_entry;
4368 got_offset += got->output_section->vma + got->output_offset;
4369 }
4370 else
4371 {
4372 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
4373 got_offset += (got->output_section->vma
4374 + got->output_offset
4375 - gotplt->output_section->vma
4376 - gotplt->output_offset);
4377 }
4378
4379 plt_offset = eh->plt_got.offset;
4380 memcpy (plt->contents + plt_offset, got_plt_entry,
4381 htab->non_lazy_plt->plt_entry_size);
4382 bfd_put_32 (output_bfd, got_offset,
4383 (plt->contents + plt_offset
4384 + htab->non_lazy_plt->plt_got_offset));
4385 }
4386
4387 if (!local_undefweak
4388 && !h->def_regular
4389 && (h->plt.offset != (bfd_vma) -1
4390 || eh->plt_got.offset != (bfd_vma) -1))
4391 {
4392 /* Mark the symbol as undefined, rather than as defined in
4393 the .plt section. Leave the value if there were any
4394 relocations where pointer equality matters (this is a clue
4395 for the dynamic linker, to make function pointer
4396 comparisons work between an application and shared
4397 library), otherwise set it to zero. If a function is only
4398 called from a binary, there is no need to slow down
4399 shared libraries because of that. */
4400 sym->st_shndx = SHN_UNDEF;
4401 if (!h->pointer_equality_needed)
4402 sym->st_value = 0;
4403 }
4404
4405 /* Don't generate dynamic GOT relocation against undefined weak
4406 symbol in executable. */
4407 if (h->got.offset != (bfd_vma) -1
4408 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
4409 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
4410 && !local_undefweak)
4411 {
4412 Elf_Internal_Rela rel;
4413 asection *relgot = htab->elf.srelgot;
4414
4415 /* This symbol has an entry in the global offset table. Set it
4416 up. */
4417
4418 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4419 abort ();
4420
4421 rel.r_offset = (htab->elf.sgot->output_section->vma
4422 + htab->elf.sgot->output_offset
4423 + (h->got.offset & ~(bfd_vma) 1));
4424
4425 /* If this is a static link, or it is a -Bsymbolic link and the
4426 symbol is defined locally or was forced to be local because
4427 of a version file, we just want to emit a RELATIVE reloc.
4428 The entry in the global offset table will already have been
4429 initialized in the relocate_section function. */
4430 if (h->def_regular
4431 && h->type == STT_GNU_IFUNC)
4432 {
4433 if (h->plt.offset == (bfd_vma) -1)
4434 {
4435 /* STT_GNU_IFUNC is referenced without PLT. */
4436 if (htab->elf.splt == NULL)
4437 {
4438 /* use .rel[a].iplt section to store .got relocations
4439 in static executable. */
4440 relgot = htab->elf.irelplt;
4441 }
4442 if (SYMBOL_REFERENCES_LOCAL (info, h))
4443 {
4444 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4445 h->root.root.string,
4446 h->root.u.def.section->owner);
4447
4448 bfd_put_32 (output_bfd,
4449 (h->root.u.def.value
4450 + h->root.u.def.section->output_section->vma
4451 + h->root.u.def.section->output_offset),
4452 htab->elf.sgot->contents + h->got.offset);
4453 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4454 }
4455 else
4456 goto do_glob_dat;
4457 }
4458 else if (bfd_link_pic (info))
4459 {
4460 /* Generate R_386_GLOB_DAT. */
4461 goto do_glob_dat;
4462 }
4463 else
4464 {
4465 asection *plt;
4466 bfd_vma plt_offset;
4467
4468 if (!h->pointer_equality_needed)
4469 abort ();
4470
4471 /* For non-shared object, we can't use .got.plt, which
4472 contains the real function addres if we need pointer
4473 equality. We load the GOT entry with the PLT entry. */
4474 if (htab->plt_second != NULL)
4475 {
4476 plt = htab->plt_second;
4477 plt_offset = eh->plt_second.offset;
4478 }
4479 else
4480 {
4481 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4482 plt_offset = h->plt.offset;
4483 }
4484 bfd_put_32 (output_bfd,
4485 (plt->output_section->vma
4486 + plt->output_offset + plt_offset),
4487 htab->elf.sgot->contents + h->got.offset);
4488 return TRUE;
4489 }
4490 }
4491 else if (bfd_link_pic (info)
4492 && SYMBOL_REFERENCES_LOCAL (info, h))
4493 {
4494 BFD_ASSERT((h->got.offset & 1) != 0);
4495 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4496 }
4497 else
4498 {
4499 BFD_ASSERT((h->got.offset & 1) == 0);
4500 do_glob_dat:
4501 bfd_put_32 (output_bfd, (bfd_vma) 0,
4502 htab->elf.sgot->contents + h->got.offset);
4503 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4504 }
4505
4506 elf_append_rel (output_bfd, relgot, &rel);
4507 }
4508
4509 if (h->needs_copy)
4510 {
4511 Elf_Internal_Rela rel;
4512 asection *s;
4513
4514 /* This symbol needs a copy reloc. Set it up. */
4515
4516 if (h->dynindx == -1
4517 || (h->root.type != bfd_link_hash_defined
4518 && h->root.type != bfd_link_hash_defweak)
4519 || htab->elf.srelbss == NULL
4520 || htab->elf.sreldynrelro == NULL)
4521 abort ();
4522
4523 rel.r_offset = (h->root.u.def.value
4524 + h->root.u.def.section->output_section->vma
4525 + h->root.u.def.section->output_offset);
4526 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4527 if (h->root.u.def.section == htab->elf.sdynrelro)
4528 s = htab->elf.sreldynrelro;
4529 else
4530 s = htab->elf.srelbss;
4531 elf_append_rel (output_bfd, s, &rel);
4532 }
4533
4534 return TRUE;
4535 }
4536
4537 /* Finish up local dynamic symbol handling. We set the contents of
4538 various dynamic sections here. */
4539
4540 static bfd_boolean
4541 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4542 {
4543 struct elf_link_hash_entry *h
4544 = (struct elf_link_hash_entry *) *slot;
4545 struct bfd_link_info *info
4546 = (struct bfd_link_info *) inf;
4547
4548 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4549 h, NULL);
4550 }
4551
4552 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4553 here since undefined weak symbol may not be dynamic and may not be
4554 called for elf_i386_finish_dynamic_symbol. */
4555
4556 static bfd_boolean
4557 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4558 void *inf)
4559 {
4560 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4561 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4562
4563 if (h->root.type != bfd_link_hash_undefweak
4564 || h->dynindx != -1)
4565 return TRUE;
4566
4567 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4568 info, h, NULL);
4569 }
4570
4571 /* Used to decide how to sort relocs in an optimal manner for the
4572 dynamic linker, before writing them out. */
4573
4574 static enum elf_reloc_type_class
4575 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4576 const asection *rel_sec ATTRIBUTE_UNUSED,
4577 const Elf_Internal_Rela *rela)
4578 {
4579 bfd *abfd = info->output_bfd;
4580 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4581 struct elf_link_hash_table *htab = elf_hash_table (info);
4582
4583 if (htab->dynsym != NULL
4584 && htab->dynsym->contents != NULL)
4585 {
4586 /* Check relocation against STT_GNU_IFUNC symbol if there are
4587 dynamic symbols. */
4588 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4589 if (r_symndx != STN_UNDEF)
4590 {
4591 Elf_Internal_Sym sym;
4592 if (!bed->s->swap_symbol_in (abfd,
4593 (htab->dynsym->contents
4594 + r_symndx * sizeof (Elf32_External_Sym)),
4595 0, &sym))
4596 abort ();
4597
4598 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4599 return reloc_class_ifunc;
4600 }
4601 }
4602
4603 switch (ELF32_R_TYPE (rela->r_info))
4604 {
4605 case R_386_IRELATIVE:
4606 return reloc_class_ifunc;
4607 case R_386_RELATIVE:
4608 return reloc_class_relative;
4609 case R_386_JUMP_SLOT:
4610 return reloc_class_plt;
4611 case R_386_COPY:
4612 return reloc_class_copy;
4613 default:
4614 return reloc_class_normal;
4615 }
4616 }
4617
4618 /* Finish up the dynamic sections. */
4619
4620 static bfd_boolean
4621 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4622 struct bfd_link_info *info)
4623 {
4624 struct elf_x86_link_hash_table *htab;
4625 bfd *dynobj;
4626 asection *sdyn;
4627 const struct elf_i386_backend_data *abed;
4628
4629 htab = elf_x86_hash_table (info, I386_ELF_DATA);
4630 if (htab == NULL)
4631 return FALSE;
4632
4633 dynobj = htab->elf.dynobj;
4634 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4635 abed = get_elf_i386_backend_data (output_bfd);
4636
4637 if (htab->elf.dynamic_sections_created)
4638 {
4639 Elf32_External_Dyn *dyncon, *dynconend;
4640
4641 if (sdyn == NULL || htab->elf.sgot == NULL)
4642 abort ();
4643
4644 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4645 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4646 for (; dyncon < dynconend; dyncon++)
4647 {
4648 Elf_Internal_Dyn dyn;
4649 asection *s;
4650
4651 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4652
4653 switch (dyn.d_tag)
4654 {
4655 default:
4656 if (htab->is_vxworks
4657 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4658 break;
4659 continue;
4660
4661 case DT_PLTGOT:
4662 s = htab->elf.sgotplt;
4663 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4664 break;
4665
4666 case DT_JMPREL:
4667 s = htab->elf.srelplt;
4668 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4669 break;
4670
4671 case DT_PLTRELSZ:
4672 s = htab->elf.srelplt;
4673 dyn.d_un.d_val = s->size;
4674 break;
4675 }
4676
4677 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4678 }
4679
4680 if (htab->elf.splt && htab->elf.splt->size > 0)
4681 {
4682 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4683 really seem like the right value. */
4684 elf_section_data (htab->elf.splt->output_section)
4685 ->this_hdr.sh_entsize = 4;
4686
4687 if (htab->plt.has_plt0)
4688 {
4689 /* Fill in the special first entry in the procedure linkage
4690 table. */
4691 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4692 htab->lazy_plt->plt0_entry_size);
4693 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4694 abed->plt0_pad_byte,
4695 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4696 if (!bfd_link_pic (info))
4697 {
4698 bfd_put_32 (output_bfd,
4699 (htab->elf.sgotplt->output_section->vma
4700 + htab->elf.sgotplt->output_offset
4701 + 4),
4702 htab->elf.splt->contents
4703 + htab->lazy_plt->plt0_got1_offset);
4704 bfd_put_32 (output_bfd,
4705 (htab->elf.sgotplt->output_section->vma
4706 + htab->elf.sgotplt->output_offset
4707 + 8),
4708 htab->elf.splt->contents
4709 + htab->lazy_plt->plt0_got2_offset);
4710
4711 if (htab->is_vxworks)
4712 {
4713 Elf_Internal_Rela rel;
4714 int num_plts = (htab->elf.splt->size
4715 / htab->plt.plt_entry_size) - 1;
4716 unsigned char *p;
4717 asection *srelplt2 = htab->srelplt2;
4718
4719 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4720 + 4. On IA32 we use REL relocations so the
4721 addend goes in the PLT directly. */
4722 rel.r_offset = (htab->elf.splt->output_section->vma
4723 + htab->elf.splt->output_offset
4724 + htab->lazy_plt->plt0_got1_offset);
4725 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4726 R_386_32);
4727 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4728 srelplt2->contents);
4729 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4730 + 8. */
4731 rel.r_offset = (htab->elf.splt->output_section->vma
4732 + htab->elf.splt->output_offset
4733 + htab->lazy_plt->plt0_got2_offset);
4734 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4735 R_386_32);
4736 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4737 srelplt2->contents +
4738 sizeof (Elf32_External_Rel));
4739 /* Correct the .rel.plt.unloaded relocations. */
4740 p = srelplt2->contents;
4741 if (bfd_link_pic (info))
4742 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4743 else
4744 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4745
4746 for (; num_plts; num_plts--)
4747 {
4748 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4749 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4750 R_386_32);
4751 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4752 p += sizeof (Elf32_External_Rel);
4753
4754 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4755 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4756 R_386_32);
4757 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4758 p += sizeof (Elf32_External_Rel);
4759 }
4760 }
4761 }
4762 }
4763 }
4764
4765 if (htab->plt_got != NULL && htab->plt_got->size > 0)
4766 elf_section_data (htab->plt_got->output_section)
4767 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4768
4769 if (htab->plt_second != NULL && htab->plt_second->size > 0)
4770 elf_section_data (htab->plt_second->output_section)
4771 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4772 }
4773
4774 /* Fill in the first three entries in the global offset table. */
4775 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
4776 {
4777 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4778 {
4779 _bfd_error_handler
4780 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4781 return FALSE;
4782 }
4783
4784 bfd_put_32 (output_bfd,
4785 (sdyn == NULL ? 0
4786 : sdyn->output_section->vma + sdyn->output_offset),
4787 htab->elf.sgotplt->contents);
4788 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4789 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4790
4791 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4792 }
4793
4794 /* Adjust .eh_frame for .plt section. */
4795 if (htab->plt_eh_frame != NULL
4796 && htab->plt_eh_frame->contents != NULL)
4797 {
4798 if (htab->elf.splt != NULL
4799 && htab->elf.splt->size != 0
4800 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4801 && htab->elf.splt->output_section != NULL
4802 && htab->plt_eh_frame->output_section != NULL)
4803 {
4804 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4805 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4806 + htab->plt_eh_frame->output_offset
4807 + PLT_FDE_START_OFFSET;
4808 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4809 htab->plt_eh_frame->contents
4810 + PLT_FDE_START_OFFSET);
4811 }
4812 if (htab->plt_eh_frame->sec_info_type
4813 == SEC_INFO_TYPE_EH_FRAME)
4814 {
4815 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4816 htab->plt_eh_frame,
4817 htab->plt_eh_frame->contents))
4818 return FALSE;
4819 }
4820 }
4821
4822 /* Adjust .eh_frame for .plt.got section. */
4823 if (htab->plt_got_eh_frame != NULL
4824 && htab->plt_got_eh_frame->contents != NULL)
4825 {
4826 if (htab->plt_got != NULL
4827 && htab->plt_got->size != 0
4828 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
4829 && htab->plt_got->output_section != NULL
4830 && htab->plt_got_eh_frame->output_section != NULL)
4831 {
4832 bfd_vma plt_start = htab->plt_got->output_section->vma;
4833 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
4834 + htab->plt_got_eh_frame->output_offset
4835 + PLT_FDE_START_OFFSET;
4836 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4837 htab->plt_got_eh_frame->contents
4838 + PLT_FDE_START_OFFSET);
4839 }
4840 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4841 {
4842 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4843 htab->plt_got_eh_frame,
4844 htab->plt_got_eh_frame->contents))
4845 return FALSE;
4846 }
4847 }
4848
4849 /* Adjust .eh_frame for the second PLT section. */
4850 if (htab->plt_second_eh_frame != NULL
4851 && htab->plt_second_eh_frame->contents != NULL)
4852 {
4853 if (htab->plt_second != NULL
4854 && htab->plt_second->size != 0
4855 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
4856 && htab->plt_second->output_section != NULL
4857 && htab->plt_second_eh_frame->output_section != NULL)
4858 {
4859 bfd_vma plt_start = htab->plt_second->output_section->vma;
4860 bfd_vma eh_frame_start
4861 = (htab->plt_second_eh_frame->output_section->vma
4862 + htab->plt_second_eh_frame->output_offset
4863 + PLT_FDE_START_OFFSET);
4864 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4865 htab->plt_second_eh_frame->contents
4866 + PLT_FDE_START_OFFSET);
4867 }
4868 if (htab->plt_second_eh_frame->sec_info_type
4869 == SEC_INFO_TYPE_EH_FRAME)
4870 {
4871 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4872 htab->plt_second_eh_frame,
4873 htab->plt_second_eh_frame->contents))
4874 return FALSE;
4875 }
4876 }
4877
4878 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4879 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4880
4881 /* Fill PLT entries for undefined weak symbols in PIE. */
4882 if (bfd_link_pie (info))
4883 bfd_hash_traverse (&info->hash->table,
4884 elf_i386_pie_finish_undefweak_symbol,
4885 info);
4886
4887 return TRUE;
4888 }
4889
4890 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4891 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4892 It has to be done before elf_link_sort_relocs is called so that
4893 dynamic relocations are properly sorted. */
4894
4895 static bfd_boolean
4896 elf_i386_output_arch_local_syms
4897 (bfd *output_bfd ATTRIBUTE_UNUSED,
4898 struct bfd_link_info *info,
4899 void *flaginfo ATTRIBUTE_UNUSED,
4900 int (*func) (void *, const char *,
4901 Elf_Internal_Sym *,
4902 asection *,
4903 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4904 {
4905 struct elf_x86_link_hash_table *htab
4906 = elf_x86_hash_table (info, I386_ELF_DATA);
4907 if (htab == NULL)
4908 return FALSE;
4909
4910 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4911 htab_traverse (htab->loc_hash_table,
4912 elf_i386_finish_local_dynamic_symbol,
4913 info);
4914
4915 return TRUE;
4916 }
4917
4918 /* Forward declaration. */
4919 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4920
4921 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4922 dynamic relocations. */
4923
4924 static long
4925 elf_i386_get_synthetic_symtab (bfd *abfd,
4926 long symcount ATTRIBUTE_UNUSED,
4927 asymbol **syms ATTRIBUTE_UNUSED,
4928 long dynsymcount,
4929 asymbol **dynsyms,
4930 asymbol **ret)
4931 {
4932 long count, i, n;
4933 int j;
4934 bfd_byte *plt_contents;
4935 long relsize;
4936 const struct elf_x86_lazy_plt_layout *lazy_plt;
4937 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4938 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4939 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4940 asection *plt;
4941 bfd_vma got_addr;
4942 enum elf_x86_plt_type plt_type;
4943 struct elf_x86_plt plts[] =
4944 {
4945 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4946 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4947 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4948 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4949 };
4950
4951 *ret = NULL;
4952
4953 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4954 return 0;
4955
4956 if (dynsymcount <= 0)
4957 return 0;
4958
4959 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4960 if (relsize <= 0)
4961 return -1;
4962
4963 non_lazy_plt = NULL;
4964 /* Silence GCC 6. */
4965 lazy_plt = NULL;
4966 non_lazy_ibt_plt = NULL;
4967 lazy_ibt_plt = NULL;
4968 switch (get_elf_i386_backend_data (abfd)->os)
4969 {
4970 case is_normal:
4971 non_lazy_plt = &elf_i386_non_lazy_plt;
4972 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4973 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4974 /* Fall through */
4975 case is_vxworks:
4976 lazy_plt = &elf_i386_lazy_plt;
4977 break;
4978 case is_nacl:
4979 lazy_plt = &elf_i386_nacl_plt;
4980 break;
4981 }
4982
4983 got_addr = 0;
4984
4985 count = 0;
4986 for (j = 0; plts[j].name != NULL; j++)
4987 {
4988 plt = bfd_get_section_by_name (abfd, plts[j].name);
4989 if (plt == NULL || plt->size == 0)
4990 continue;
4991
4992 /* Get the PLT section contents. */
4993 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4994 if (plt_contents == NULL)
4995 break;
4996 if (!bfd_get_section_contents (abfd, (asection *) plt,
4997 plt_contents, 0, plt->size))
4998 {
4999 free (plt_contents);
5000 break;
5001 }
5002
5003 /* Check what kind of PLT it is. */
5004 plt_type = plt_unknown;
5005 if (plts[j].type == plt_unknown
5006 && (plt->size >= (lazy_plt->plt0_entry_size
5007 + lazy_plt->plt_entry_size)))
5008 {
5009 /* Match lazy PLT first. */
5010 if (memcmp (plt_contents, lazy_plt->plt0_entry,
5011 lazy_plt->plt0_got1_offset) == 0)
5012 {
5013 /* The fist entry in the lazy IBT PLT is the same as the
5014 normal lazy PLT. */
5015 if (lazy_ibt_plt != NULL
5016 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
5017 lazy_ibt_plt->plt_entry,
5018 lazy_ibt_plt->plt_got_offset) == 0))
5019 plt_type = plt_lazy | plt_second;
5020 else
5021 plt_type = plt_lazy;
5022 }
5023 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
5024 lazy_plt->plt0_got1_offset) == 0)
5025 {
5026 /* The fist entry in the PIC lazy IBT PLT is the same as
5027 the normal PIC lazy PLT. */
5028 if (lazy_ibt_plt != NULL
5029 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
5030 lazy_ibt_plt->pic_plt_entry,
5031 lazy_ibt_plt->plt_got_offset) == 0))
5032 plt_type = plt_lazy | plt_pic | plt_second;
5033 else
5034 plt_type = plt_lazy | plt_pic;
5035 }
5036 }
5037
5038 if (non_lazy_plt != NULL
5039 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
5040 && plt->size >= non_lazy_plt->plt_entry_size)
5041 {
5042 /* Match non-lazy PLT. */
5043 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
5044 non_lazy_plt->plt_got_offset) == 0)
5045 plt_type = plt_non_lazy;
5046 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
5047 non_lazy_plt->plt_got_offset) == 0)
5048 plt_type = plt_pic;
5049 }
5050
5051 if ((non_lazy_ibt_plt != NULL)
5052 && (plt_type == plt_unknown || plt_type == plt_second)
5053 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
5054 {
5055 if (memcmp (plt_contents,
5056 non_lazy_ibt_plt->plt_entry,
5057 non_lazy_ibt_plt->plt_got_offset) == 0)
5058 {
5059 /* Match IBT PLT. */
5060 plt_type = plt_second;
5061 non_lazy_plt = non_lazy_ibt_plt;
5062 }
5063 else if (memcmp (plt_contents,
5064 non_lazy_ibt_plt->pic_plt_entry,
5065 non_lazy_ibt_plt->plt_got_offset) == 0)
5066 {
5067 /* Match PIC IBT PLT. */
5068 plt_type = plt_second | plt_pic;
5069 non_lazy_plt = non_lazy_ibt_plt;
5070 }
5071 }
5072
5073 if (plt_type == plt_unknown)
5074 {
5075 free (plt_contents);
5076 continue;
5077 }
5078
5079 plts[j].sec = plt;
5080 plts[j].type = plt_type;
5081
5082 if ((plt_type & plt_lazy))
5083 {
5084 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
5085 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
5086 /* Skip PLT0 in lazy PLT. */
5087 i = 1;
5088 }
5089 else
5090 {
5091 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
5092 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
5093 i = 0;
5094 }
5095
5096 /* Skip lazy PLT when the second PLT is used. */
5097 if ((plt_type & (plt_lazy | plt_second))
5098 == (plt_lazy | plt_second))
5099 plts[j].count = 0;
5100 else
5101 {
5102 n = plt->size / plts[j].plt_entry_size;
5103 plts[j].count = n;
5104 count += n - i;
5105 }
5106
5107 plts[j].contents = plt_contents;
5108
5109 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
5110 if ((plt_type & plt_pic))
5111 got_addr = (bfd_vma) -1;
5112 }
5113
5114 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
5115 got_addr, plts, dynsyms,
5116 ret);
5117 }
5118
5119 /* Set up i386 GNU properties. Return the first relocatable ELF input
5120 with GNU properties if found. Otherwise, return NULL. */
5121
5122 static bfd *
5123 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
5124 {
5125 struct elf_x86_plt_layout_table plt_layout;
5126
5127 plt_layout.normal_target = FALSE;
5128 plt_layout.is_vxworks = FALSE;
5129 switch (get_elf_i386_backend_data (info->output_bfd)->os)
5130 {
5131 case is_normal:
5132 plt_layout.lazy_plt = &elf_i386_lazy_plt;
5133 plt_layout.non_lazy_plt = &elf_i386_non_lazy_plt;
5134 plt_layout.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
5135 plt_layout.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
5136 plt_layout.normal_target = TRUE;
5137 break;
5138 case is_vxworks:
5139 plt_layout.lazy_plt = &elf_i386_lazy_plt;
5140 plt_layout.non_lazy_plt = NULL;
5141 plt_layout.lazy_ibt_plt = NULL;
5142 plt_layout.non_lazy_ibt_plt = NULL;
5143 plt_layout.is_vxworks = TRUE;
5144 break;
5145 case is_nacl:
5146 plt_layout.lazy_plt = &elf_i386_nacl_plt;
5147 plt_layout.non_lazy_plt = NULL;
5148 plt_layout.lazy_ibt_plt = NULL;
5149 plt_layout.non_lazy_ibt_plt = NULL;
5150 break;
5151 }
5152
5153 return _bfd_x86_elf_link_setup_gnu_properties (info, &plt_layout);
5154 }
5155
5156 #define TARGET_LITTLE_SYM i386_elf32_vec
5157 #define TARGET_LITTLE_NAME "elf32-i386"
5158 #define ELF_ARCH bfd_arch_i386
5159 #define ELF_TARGET_ID I386_ELF_DATA
5160 #define ELF_MACHINE_CODE EM_386
5161 #define ELF_MAXPAGESIZE 0x1000
5162
5163 #define elf_backend_can_gc_sections 1
5164 #define elf_backend_can_refcount 1
5165 #define elf_backend_want_got_plt 1
5166 #define elf_backend_plt_readonly 1
5167 #define elf_backend_want_plt_sym 0
5168 #define elf_backend_got_header_size 12
5169 #define elf_backend_plt_alignment 4
5170 #define elf_backend_dtrel_excludes_plt 1
5171 #define elf_backend_extern_protected_data 1
5172 #define elf_backend_caches_rawsize 1
5173 #define elf_backend_want_dynrelro 1
5174
5175 /* Support RELA for objdump of prelink objects. */
5176 #define elf_info_to_howto elf_i386_info_to_howto_rel
5177 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5178
5179 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5180 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5181 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5182 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5183
5184 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5185 #define elf_backend_check_relocs elf_i386_check_relocs
5186 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
5187 #define elf_backend_fake_sections elf_i386_fake_sections
5188 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5189 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5190 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
5191 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5192 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5193 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5194 #define elf_backend_relocate_section elf_i386_relocate_section
5195 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5196 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
5197
5198 #include "elf32-target.h"
5199
5200 /* FreeBSD support. */
5201
5202 #undef TARGET_LITTLE_SYM
5203 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5204 #undef TARGET_LITTLE_NAME
5205 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5206 #undef ELF_OSABI
5207 #define ELF_OSABI ELFOSABI_FREEBSD
5208
5209 /* The kernel recognizes executables as valid only if they carry a
5210 "FreeBSD" label in the ELF header. So we put this label on all
5211 executables and (for simplicity) also all other object files. */
5212
5213 static void
5214 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5215 {
5216 _bfd_elf_post_process_headers (abfd, info);
5217
5218 #ifdef OLD_FREEBSD_ABI_LABEL
5219 {
5220 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5221 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5222 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5223 }
5224 #endif
5225 }
5226
5227 #undef elf_backend_post_process_headers
5228 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5229 #undef elf32_bed
5230 #define elf32_bed elf32_i386_fbsd_bed
5231
5232 #undef elf_backend_add_symbol_hook
5233
5234 #include "elf32-target.h"
5235
5236 /* Solaris 2. */
5237
5238 #undef TARGET_LITTLE_SYM
5239 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5240 #undef TARGET_LITTLE_NAME
5241 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5242
5243 #undef elf_backend_post_process_headers
5244
5245 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5246 objects won't be recognized. */
5247 #undef ELF_OSABI
5248
5249 #undef elf32_bed
5250 #define elf32_bed elf32_i386_sol2_bed
5251
5252 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5253 boundary. */
5254 #undef elf_backend_static_tls_alignment
5255 #define elf_backend_static_tls_alignment 8
5256
5257 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5258
5259 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5260 File, p.63. */
5261 #undef elf_backend_want_plt_sym
5262 #define elf_backend_want_plt_sym 1
5263
5264 #undef elf_backend_strtab_flags
5265 #define elf_backend_strtab_flags SHF_STRINGS
5266
5267 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
5268 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
5269 FALSE otherwise. ISECTION is the best guess matching section from the
5270 input bfd IBFD, but it might be NULL. */
5271
5272 static bfd_boolean
5273 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
5274 bfd *obfd ATTRIBUTE_UNUSED,
5275 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
5276 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
5277 {
5278 /* PR 19938: FIXME: Need to add code for setting the sh_info
5279 and sh_link fields of Solaris specific section types. */
5280 return FALSE;
5281
5282 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
5283 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
5284
5285 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
5286
5287 The following values should be set:
5288
5289 Type Link Info
5290 -----------------------------------------------------------------------------
5291 SHT_SUNW_ancillary The section header index of 0
5292 [0x6fffffee] the associated string table.
5293
5294 SHT_SUNW_capinfo The section header index of For a dynamic object, the
5295 [0x6ffffff0] the associated symbol table. section header index of
5296 the associated
5297 SHT_SUNW_capchain table,
5298 otherwise 0.
5299
5300 SHT_SUNW_symsort The section header index of 0
5301 [0x6ffffff1] the associated symbol table.
5302
5303 SHT_SUNW_tlssort The section header index of 0
5304 [0x6ffffff2] the associated symbol table.
5305
5306 SHT_SUNW_LDYNSYM The section header index of One greater than the
5307 [0x6ffffff3] the associated string table. symbol table index of the
5308 This index is the same string last local symbol,
5309 table used by the SHT_DYNSYM STB_LOCAL. Since
5310 section. SHT_SUNW_LDYNSYM only
5311 contains local symbols,
5312 sh_info is equivalent to
5313 the number of symbols in
5314 the table.
5315
5316 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
5317 [0x6ffffff5] the section header index of to named strings, the
5318 the associated section header index of
5319 SHT_SUNW_capinfo table, the associated string
5320 otherwise 0. table, otherwise 0.
5321
5322 SHT_SUNW_move The section header index of 0
5323 [0x6ffffffa] the associated symbol table.
5324
5325 SHT_SUNW_COMDAT 0 0
5326 [0x6ffffffb]
5327
5328 SHT_SUNW_syminfo The section header index of The section header index
5329 [0x6ffffffc] the associated symbol table. of the associated
5330 .dynamic section.
5331
5332 SHT_SUNW_verdef The section header index of The number of version
5333 [0x6ffffffd] the associated string table. definitions within the
5334 section.
5335
5336 SHT_SUNW_verneed The section header index of The number of version
5337 [0x6ffffffe] the associated string table. dependencies within the
5338 section.
5339
5340 SHT_SUNW_versym The section header index of 0
5341 [0x6fffffff] the associated symbol table. */
5342 }
5343
5344 #undef elf_backend_copy_special_section_fields
5345 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
5346
5347 #include "elf32-target.h"
5348
5349 /* Intel MCU support. */
5350
5351 static bfd_boolean
5352 elf32_iamcu_elf_object_p (bfd *abfd)
5353 {
5354 /* Set the right machine number for an IAMCU elf32 file. */
5355 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5356 return TRUE;
5357 }
5358
5359 #undef TARGET_LITTLE_SYM
5360 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5361 #undef TARGET_LITTLE_NAME
5362 #define TARGET_LITTLE_NAME "elf32-iamcu"
5363 #undef ELF_ARCH
5364 #define ELF_ARCH bfd_arch_iamcu
5365
5366 #undef ELF_MACHINE_CODE
5367 #define ELF_MACHINE_CODE EM_IAMCU
5368
5369 #undef ELF_OSABI
5370
5371 #undef elf32_bed
5372 #define elf32_bed elf32_iamcu_bed
5373
5374 #undef elf_backend_object_p
5375 #define elf_backend_object_p elf32_iamcu_elf_object_p
5376
5377 #undef elf_backend_static_tls_alignment
5378
5379 #undef elf_backend_want_plt_sym
5380 #define elf_backend_want_plt_sym 0
5381
5382 #undef elf_backend_strtab_flags
5383 #undef elf_backend_copy_special_section_fields
5384
5385 #include "elf32-target.h"
5386
5387 /* Restore defaults. */
5388 #undef ELF_ARCH
5389 #define ELF_ARCH bfd_arch_i386
5390 #undef ELF_MACHINE_CODE
5391 #define ELF_MACHINE_CODE EM_386
5392
5393 /* Native Client support. */
5394
5395 #undef TARGET_LITTLE_SYM
5396 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5397 #undef TARGET_LITTLE_NAME
5398 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5399 #undef elf32_bed
5400 #define elf32_bed elf32_i386_nacl_bed
5401
5402 #undef ELF_MAXPAGESIZE
5403 #define ELF_MAXPAGESIZE 0x10000
5404
5405 /* Restore defaults. */
5406 #undef ELF_OSABI
5407 #undef elf_backend_want_plt_sym
5408 #define elf_backend_want_plt_sym 0
5409 #undef elf_backend_post_process_headers
5410 #undef elf_backend_static_tls_alignment
5411
5412 /* NaCl uses substantially different PLT entries for the same effects. */
5413
5414 #undef elf_backend_plt_alignment
5415 #define elf_backend_plt_alignment 5
5416 #define NACL_PLT_ENTRY_SIZE 64
5417 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5418
5419 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5420 {
5421 0xff, 0x35, /* pushl contents of address */
5422 0, 0, 0, 0, /* replaced with address of .got + 4. */
5423 0x8b, 0x0d, /* movl contents of address, %ecx */
5424 0, 0, 0, 0, /* replaced with address of .got + 8. */
5425 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5426 0xff, 0xe1 /* jmp *%ecx */
5427 };
5428
5429 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5430 {
5431 0x8b, 0x0d, /* movl contents of address, %ecx */
5432 0, 0, 0, 0, /* replaced with GOT slot address. */
5433 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5434 0xff, 0xe1, /* jmp *%ecx */
5435
5436 /* Pad to the next 32-byte boundary with nop instructions. */
5437 0x90,
5438 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5439 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5440
5441 /* Lazy GOT entries point here (32-byte aligned). */
5442 0x68, /* pushl immediate */
5443 0, 0, 0, 0, /* replaced with reloc offset. */
5444 0xe9, /* jmp relative */
5445 0, 0, 0, 0, /* replaced with offset to .plt. */
5446
5447 /* Pad to the next 32-byte boundary with nop instructions. */
5448 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5449 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5450 0x90, 0x90
5451 };
5452
5453 static const bfd_byte
5454 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5455 {
5456 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5457 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5458 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5459 0xff, 0xe1, /* jmp *%ecx */
5460
5461 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5462 so pad to that size with nop instructions. */
5463 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5464 };
5465
5466 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5467 {
5468 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5469 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5470 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5471 0xff, 0xe1, /* jmp *%ecx */
5472
5473 /* Pad to the next 32-byte boundary with nop instructions. */
5474 0x90,
5475 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5476 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5477
5478 /* Lazy GOT entries point here (32-byte aligned). */
5479 0x68, /* pushl immediate */
5480 0, 0, 0, 0, /* replaced with offset into relocation table. */
5481 0xe9, /* jmp relative */
5482 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5483
5484 /* Pad to the next 32-byte boundary with nop instructions. */
5485 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5486 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5487 0x90, 0x90
5488 };
5489
5490 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5491 {
5492 #if (PLT_CIE_LENGTH != 20 \
5493 || PLT_FDE_LENGTH != 36 \
5494 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5495 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5496 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5497 #endif
5498 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5499 0, 0, 0, 0, /* CIE ID */
5500 1, /* CIE version */
5501 'z', 'R', 0, /* Augmentation string */
5502 1, /* Code alignment factor */
5503 0x7c, /* Data alignment factor: -4 */
5504 8, /* Return address column */
5505 1, /* Augmentation size */
5506 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5507 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5508 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5509 DW_CFA_nop, DW_CFA_nop,
5510
5511 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5512 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5513 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5514 0, 0, 0, 0, /* .plt size goes here */
5515 0, /* Augmentation size */
5516 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5517 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5518 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5519 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5520 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5521 13, /* Block length */
5522 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5523 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5524 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5525 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5526 DW_CFA_nop, DW_CFA_nop
5527 };
5528
5529 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
5530 {
5531 elf_i386_nacl_plt0_entry, /* plt0_entry */
5532 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5533 elf_i386_nacl_plt_entry, /* plt_entry */
5534 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5535 2, /* plt0_got1_offset */
5536 8, /* plt0_got2_offset */
5537 0, /* plt0_got2_insn_end */
5538 2, /* plt_got_offset */
5539 33, /* plt_reloc_offset */
5540 38, /* plt_plt_offset */
5541 0, /* plt_got_insn_size */
5542 0, /* plt_plt_insn_end */
5543 32, /* plt_lazy_offset */
5544 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5545 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5546 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5547 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
5548 };
5549
5550 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5551 {
5552 0x90, /* plt0_pad_byte: nop insn */
5553 is_nacl /* os */
5554 };
5555
5556 static bfd_boolean
5557 elf32_i386_nacl_elf_object_p (bfd *abfd)
5558 {
5559 /* Set the right machine number for a NaCl i386 ELF32 file. */
5560 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5561 return TRUE;
5562 }
5563
5564 #undef elf_backend_arch_data
5565 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5566
5567 #undef elf_backend_object_p
5568 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5569 #undef elf_backend_modify_segment_map
5570 #define elf_backend_modify_segment_map nacl_modify_segment_map
5571 #undef elf_backend_modify_program_headers
5572 #define elf_backend_modify_program_headers nacl_modify_program_headers
5573 #undef elf_backend_final_write_processing
5574 #define elf_backend_final_write_processing nacl_final_write_processing
5575
5576 #include "elf32-target.h"
5577
5578 /* Restore defaults. */
5579 #undef elf_backend_object_p
5580 #undef elf_backend_modify_segment_map
5581 #undef elf_backend_modify_program_headers
5582 #undef elf_backend_final_write_processing
5583
5584 /* VxWorks support. */
5585
5586 #undef TARGET_LITTLE_SYM
5587 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5588 #undef TARGET_LITTLE_NAME
5589 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5590 #undef ELF_OSABI
5591 #undef ELF_MAXPAGESIZE
5592 #define ELF_MAXPAGESIZE 0x1000
5593 #undef elf_backend_plt_alignment
5594 #define elf_backend_plt_alignment 4
5595
5596 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5597 {
5598 0x90, /* plt0_pad_byte */
5599 is_vxworks /* os */
5600 };
5601
5602 #undef elf_backend_arch_data
5603 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5604
5605 #undef elf_backend_relocs_compatible
5606 #undef elf_backend_add_symbol_hook
5607 #define elf_backend_add_symbol_hook \
5608 elf_vxworks_add_symbol_hook
5609 #undef elf_backend_link_output_symbol_hook
5610 #define elf_backend_link_output_symbol_hook \
5611 elf_vxworks_link_output_symbol_hook
5612 #undef elf_backend_emit_relocs
5613 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5614 #undef elf_backend_final_write_processing
5615 #define elf_backend_final_write_processing \
5616 elf_vxworks_final_write_processing
5617 #undef elf_backend_static_tls_alignment
5618
5619 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5620 define it. */
5621 #undef elf_backend_want_plt_sym
5622 #define elf_backend_want_plt_sym 1
5623
5624 #undef elf32_bed
5625 #define elf32_bed elf32_i386_vxworks_bed
5626
5627 #include "elf32-target.h"
GDB Binutils - Deliverables
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