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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) 1993-2018 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 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
186
187 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
188
189 #ifdef DEBUG_GEN_RELOC
190 #define TRACE(str) \
191 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 #else
193 #define TRACE(str)
194 #endif
195
196 static reloc_howto_type *
197 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
198 bfd_reloc_code_real_type code)
199 {
200 switch (code)
201 {
202 case BFD_RELOC_NONE:
203 TRACE ("BFD_RELOC_NONE");
204 return &elf_howto_table[R_386_NONE];
205
206 case BFD_RELOC_32:
207 TRACE ("BFD_RELOC_32");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_CTOR:
211 TRACE ("BFD_RELOC_CTOR");
212 return &elf_howto_table[R_386_32];
213
214 case BFD_RELOC_32_PCREL:
215 TRACE ("BFD_RELOC_PC32");
216 return &elf_howto_table[R_386_PC32];
217
218 case BFD_RELOC_386_GOT32:
219 TRACE ("BFD_RELOC_386_GOT32");
220 return &elf_howto_table[R_386_GOT32];
221
222 case BFD_RELOC_386_PLT32:
223 TRACE ("BFD_RELOC_386_PLT32");
224 return &elf_howto_table[R_386_PLT32];
225
226 case BFD_RELOC_386_COPY:
227 TRACE ("BFD_RELOC_386_COPY");
228 return &elf_howto_table[R_386_COPY];
229
230 case BFD_RELOC_386_GLOB_DAT:
231 TRACE ("BFD_RELOC_386_GLOB_DAT");
232 return &elf_howto_table[R_386_GLOB_DAT];
233
234 case BFD_RELOC_386_JUMP_SLOT:
235 TRACE ("BFD_RELOC_386_JUMP_SLOT");
236 return &elf_howto_table[R_386_JUMP_SLOT];
237
238 case BFD_RELOC_386_RELATIVE:
239 TRACE ("BFD_RELOC_386_RELATIVE");
240 return &elf_howto_table[R_386_RELATIVE];
241
242 case BFD_RELOC_386_GOTOFF:
243 TRACE ("BFD_RELOC_386_GOTOFF");
244 return &elf_howto_table[R_386_GOTOFF];
245
246 case BFD_RELOC_386_GOTPC:
247 TRACE ("BFD_RELOC_386_GOTPC");
248 return &elf_howto_table[R_386_GOTPC];
249
250 /* These relocs are a GNU extension. */
251 case BFD_RELOC_386_TLS_TPOFF:
252 TRACE ("BFD_RELOC_386_TLS_TPOFF");
253 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_IE:
256 TRACE ("BFD_RELOC_386_TLS_IE");
257 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_GOTIE:
260 TRACE ("BFD_RELOC_386_TLS_GOTIE");
261 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_LE:
264 TRACE ("BFD_RELOC_386_TLS_LE");
265 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_GD:
268 TRACE ("BFD_RELOC_386_TLS_GD");
269 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
270
271 case BFD_RELOC_386_TLS_LDM:
272 TRACE ("BFD_RELOC_386_TLS_LDM");
273 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
274
275 case BFD_RELOC_16:
276 TRACE ("BFD_RELOC_16");
277 return &elf_howto_table[R_386_16 - R_386_ext_offset];
278
279 case BFD_RELOC_16_PCREL:
280 TRACE ("BFD_RELOC_16_PCREL");
281 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
282
283 case BFD_RELOC_8:
284 TRACE ("BFD_RELOC_8");
285 return &elf_howto_table[R_386_8 - R_386_ext_offset];
286
287 case BFD_RELOC_8_PCREL:
288 TRACE ("BFD_RELOC_8_PCREL");
289 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
290
291 /* Common with Sun TLS implementation. */
292 case BFD_RELOC_386_TLS_LDO_32:
293 TRACE ("BFD_RELOC_386_TLS_LDO_32");
294 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_IE_32:
297 TRACE ("BFD_RELOC_386_TLS_IE_32");
298 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_LE_32:
301 TRACE ("BFD_RELOC_386_TLS_LE_32");
302 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPMOD32:
305 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
306 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_DTPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
310 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_TPOFF32:
313 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
314 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
315
316 case BFD_RELOC_SIZE32:
317 TRACE ("BFD_RELOC_SIZE32");
318 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_GOTDESC:
321 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
322 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_TLS_DESC_CALL:
325 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
326 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
327
328 case BFD_RELOC_386_TLS_DESC:
329 TRACE ("BFD_RELOC_386_TLS_DESC");
330 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
331
332 case BFD_RELOC_386_IRELATIVE:
333 TRACE ("BFD_RELOC_386_IRELATIVE");
334 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
335
336 case BFD_RELOC_386_GOT32X:
337 TRACE ("BFD_RELOC_386_GOT32X");
338 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
339
340 case BFD_RELOC_VTABLE_INHERIT:
341 TRACE ("BFD_RELOC_VTABLE_INHERIT");
342 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
343
344 case BFD_RELOC_VTABLE_ENTRY:
345 TRACE ("BFD_RELOC_VTABLE_ENTRY");
346 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
347
348 default:
349 break;
350 }
351
352 TRACE ("Unknown");
353 return 0;
354 }
355
356 static reloc_howto_type *
357 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
358 const char *r_name)
359 {
360 unsigned int i;
361
362 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
363 if (elf_howto_table[i].name != NULL
364 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
365 return &elf_howto_table[i];
366
367 return NULL;
368 }
369
370 static reloc_howto_type *
371 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
372 {
373 unsigned int indx;
374
375 if ((indx = r_type) >= R_386_standard
376 && ((indx = r_type - R_386_ext_offset) - R_386_standard
377 >= R_386_ext - R_386_standard)
378 && ((indx = r_type - R_386_tls_offset) - R_386_ext
379 >= R_386_ext2 - R_386_ext)
380 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
381 >= R_386_vt - R_386_ext2))
382 {
383 /* xgettext:c-format */
384 _bfd_error_handler (_("%B: invalid relocation type %d"),
385 abfd, (int) r_type);
386 indx = R_386_NONE;
387 }
388 /* PR 17512: file: 0f67f69d. */
389 if (elf_howto_table [indx].type != r_type)
390 return NULL;
391 return &elf_howto_table[indx];
392 }
393
394 static void
395 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
396 arelent *cache_ptr,
397 Elf_Internal_Rela *dst)
398 {
399 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
400 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
401 }
402
403 /* Return whether a symbol name implies a local label. The UnixWare
404 2.1 cc generates temporary symbols that start with .X, so we
405 recognize them here. FIXME: do other SVR4 compilers also use .X?.
406 If so, we should move the .X recognition into
407 _bfd_elf_is_local_label_name. */
408
409 static bfd_boolean
410 elf_i386_is_local_label_name (bfd *abfd, const char *name)
411 {
412 if (name[0] == '.' && name[1] == 'X')
413 return TRUE;
414
415 return _bfd_elf_is_local_label_name (abfd, name);
416 }
417 \f
418 /* Support for core dump NOTE sections. */
419
420 static bfd_boolean
421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
422 {
423 int offset;
424 size_t size;
425
426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
427 {
428 int pr_version = bfd_get_32 (abfd, note->descdata);
429
430 if (pr_version != 1)
431 return FALSE;
432
433 /* pr_cursig */
434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
435
436 /* pr_pid */
437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
438
439 /* pr_reg */
440 offset = 28;
441 size = bfd_get_32 (abfd, note->descdata + 8);
442 }
443 else
444 {
445 switch (note->descsz)
446 {
447 default:
448 return FALSE;
449
450 case 144: /* Linux/i386 */
451 /* pr_cursig */
452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
453
454 /* pr_pid */
455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
456
457 /* pr_reg */
458 offset = 72;
459 size = 68;
460
461 break;
462 }
463 }
464
465 /* Make a ".reg/999" section. */
466 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
467 size, note->descpos + offset);
468 }
469
470 static bfd_boolean
471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
472 {
473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
474 {
475 int pr_version = bfd_get_32 (abfd, note->descdata);
476
477 if (pr_version != 1)
478 return FALSE;
479
480 elf_tdata (abfd)->core->program
481 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
482 elf_tdata (abfd)->core->command
483 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
484 }
485 else
486 {
487 switch (note->descsz)
488 {
489 default:
490 return FALSE;
491
492 case 124: /* Linux/i386 elf_prpsinfo. */
493 elf_tdata (abfd)->core->pid
494 = bfd_get_32 (abfd, note->descdata + 12);
495 elf_tdata (abfd)->core->program
496 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
497 elf_tdata (abfd)->core->command
498 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
499 }
500 }
501
502 /* Note that for some reason, a spurious space is tacked
503 onto the end of the args in some (at least one anyway)
504 implementations, so strip it off if it exists. */
505 {
506 char *command = elf_tdata (abfd)->core->command;
507 int n = strlen (command);
508
509 if (0 < n && command[n - 1] == ' ')
510 command[n - 1] = '\0';
511 }
512
513 return TRUE;
514 }
515 \f
516 /* Functions for the i386 ELF linker.
517
518 In order to gain some understanding of code in this file without
519 knowing all the intricate details of the linker, note the
520 following:
521
522 Functions named elf_i386_* are called by external routines, other
523 functions are only called locally. elf_i386_* functions appear
524 in this file more or less in the order in which they are called
525 from external routines. eg. elf_i386_check_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
528
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
530
531 #define LAZY_PLT_ENTRY_SIZE 16
532
533 /* The size in bytes of an entry in the non-lazy procedure linkage
534 table. */
535
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
537
538 /* The first entry in an absolute lazy procedure linkage table looks
539 like this. See the SVR4 ABI i386 supplement to see how this works.
540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
541
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
543 {
544 0xff, 0x35, /* pushl contents of address */
545 0, 0, 0, 0, /* replaced with address of .got + 4. */
546 0xff, 0x25, /* jmp indirect */
547 0, 0, 0, 0 /* replaced with address of .got + 8. */
548 };
549
550 /* Subsequent entries in an absolute lazy procedure linkage table look
551 like this. */
552
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
557 0x68, /* pushl immediate */
558 0, 0, 0, 0, /* replaced with offset into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt. */
561 };
562
563 /* The first entry in a PIC lazy procedure linkage table look like
564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
565 lazy_plt->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
574 this. */
575
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
577 {
578 0xff, 0xa3, /* jmp *offset(%ebx) */
579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
580 0x68, /* pushl immediate */
581 0, 0, 0, 0, /* replaced with offset into relocation table. */
582 0xe9, /* jmp relative */
583 0, 0, 0, 0 /* replaced with offset to start of .plt. */
584 };
585
586 /* Entries in the non-lazy procedure linkage table look like this. */
587
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
589 {
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
593 };
594
595 /* Entries in the PIC non-lazy procedure linkage table look like
596 this. */
597
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
599 {
600 0xff, 0xa3, /* jmp *offset(%ebx) */
601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
602 0x66, 0x90 /* xchg %ax,%ax */
603 };
604
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
607
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
609 {
610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
613 };
614
615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
616 table look like this. Subsequent entries for a PIC IBT-enabled lazy
617 procedure linkage table are the same. */
618
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
620 {
621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
622 0x68, 0, 0, 0, 0, /* pushl immediate */
623 0xe9, 0, 0, 0, 0, /* jmp relative */
624 0x66, 0x90 /* xchg %ax,%ax */
625 };
626
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
628 look like. */
629
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
631 {
632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
635 };
636
637 /* Entries for branches with IBT-enabled in the absolute non-lazey
638 procedure linkage table look like this. They have the same size
639 as the lazy PLT entry. */
640
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
642 {
643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 };
647
648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
649 linkage table look like this. They have the same size as the lazy
650 PLT entry. */
651
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
653 {
654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
657 };
658
659 /* .eh_frame covering the lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
662 {
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
665 1, /* CIE version */
666 'z', 'R', 0, /* Augmentation string */
667 1, /* Code alignment factor */
668 0x7c, /* Data alignment factor */
669 8, /* Return address column */
670 1, /* Augmentation size */
671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
674 DW_CFA_nop, DW_CFA_nop,
675
676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
679 0, 0, 0, 0, /* .plt size goes here */
680 0, /* Augmentation size */
681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
686 11, /* Block length */
687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
690 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
692 };
693
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
695
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
697 {
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
700 1, /* CIE version */
701 'z', 'R', 0, /* Augmentation string */
702 1, /* Code alignment factor */
703 0x7c, /* Data alignment factor */
704 8, /* Return address column */
705 1, /* Augmentation size */
706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
709 DW_CFA_nop, DW_CFA_nop,
710
711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
714 0, 0, 0, 0, /* .plt size goes here */
715 0, /* Augmentation size */
716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
721 11, /* Block length */
722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
727 };
728
729 /* .eh_frame covering the non-lazy .plt section. */
730
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
732 {
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
736 1, /* CIE version */
737 'z', 'R', 0, /* Augmentation string */
738 1, /* Code alignment factor */
739 0x7c, /* Data alignment factor */
740 8, /* Return address column */
741 1, /* Augmentation size */
742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
745 DW_CFA_nop, DW_CFA_nop,
746
747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
750 0, 0, 0, 0, /* non-lazy .plt size goes here */
751 0, /* Augmentation size */
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
757 {
758 elf_i386_lazy_plt0_entry, /* plt0_entry */
759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
760 elf_i386_lazy_plt_entry, /* plt_entry */
761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
762 2, /* plt0_got1_offset */
763 8, /* plt0_got2_offset */
764 0, /* plt0_got2_insn_end */
765 2, /* plt_got_offset */
766 7, /* plt_reloc_offset */
767 12, /* plt_plt_offset */
768 0, /* plt_got_insn_size */
769 0, /* plt_plt_insn_end */
770 6, /* plt_lazy_offset */
771 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
772 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
773 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
774 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
775 };
776
777 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
778 {
779 elf_i386_non_lazy_plt_entry, /* plt_entry */
780 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
781 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
782 2, /* plt_got_offset */
783 0, /* plt_got_insn_size */
784 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
785 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
786 };
787
788 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
789 {
790 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
791 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
792 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
793 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
794 2, /* plt0_got1_offset */
795 8, /* plt0_got2_offset */
796 0, /* plt0_got2_insn_end */
797 4+2, /* plt_got_offset */
798 4+1, /* plt_reloc_offset */
799 4+6, /* plt_plt_offset */
800 0, /* plt_got_insn_size */
801 0, /* plt_plt_insn_end */
802 0, /* plt_lazy_offset */
803 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
804 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
805 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
806 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
807 };
808
809 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
810 {
811 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
812 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
813 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
814 4+2, /* plt_got_offset */
815 0, /* plt_got_insn_size */
816 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
817 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
818 };
819 \f
820
821 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
822 for the PLTResolve stub and then for each PLT entry. */
823 #define PLTRESOLVE_RELOCS_SHLIB 0
824 #define PLTRESOLVE_RELOCS 2
825 #define PLT_NON_JUMP_SLOT_RELOCS 2
826
827 /* These are the standard parameters. */
828 static const struct elf_x86_backend_data elf_i386_arch_bed =
829 {
830 is_normal /* os */
831 };
832
833 #define elf_backend_arch_data &elf_i386_arch_bed
834
835 /* Return TRUE if the TLS access code sequence support transition
836 from R_TYPE. */
837
838 static bfd_boolean
839 elf_i386_check_tls_transition (asection *sec,
840 bfd_byte *contents,
841 Elf_Internal_Shdr *symtab_hdr,
842 struct elf_link_hash_entry **sym_hashes,
843 unsigned int r_type,
844 const Elf_Internal_Rela *rel,
845 const Elf_Internal_Rela *relend)
846 {
847 unsigned int val, type, reg;
848 unsigned long r_symndx;
849 struct elf_link_hash_entry *h;
850 bfd_vma offset;
851 bfd_byte *call;
852 bfd_boolean indirect_call;
853
854 offset = rel->r_offset;
855 switch (r_type)
856 {
857 case R_386_TLS_GD:
858 case R_386_TLS_LDM:
859 if (offset < 2 || (rel + 1) >= relend)
860 return FALSE;
861
862 indirect_call = FALSE;
863 call = contents + offset + 4;
864 val = *(call - 5);
865 type = *(call - 6);
866 if (r_type == R_386_TLS_GD)
867 {
868 /* Check transition from GD access model. Only
869 leal foo@tlsgd(,%ebx,1), %eax
870 call ___tls_get_addr@PLT
871 or
872 leal foo@tlsgd(%ebx) %eax
873 call ___tls_get_addr@PLT
874 nop
875 or
876 leal foo@tlsgd(%reg), %eax
877 call *___tls_get_addr@GOT(%reg)
878 which may be converted to
879 addr32 call ___tls_get_addr
880 can transit to different access model. */
881 if ((offset + 10) > sec->size
882 || (type != 0x8d && type != 0x04))
883 return FALSE;
884
885 if (type == 0x04)
886 {
887 /* leal foo@tlsgd(,%ebx,1), %eax
888 call ___tls_get_addr@PLT */
889 if (offset < 3)
890 return FALSE;
891
892 if (*(call - 7) != 0x8d
893 || val != 0x1d
894 || call[0] != 0xe8)
895 return FALSE;
896 }
897 else
898 {
899 /* This must be
900 leal foo@tlsgd(%ebx), %eax
901 call ___tls_get_addr@PLT
902 nop
903 or
904 leal foo@tlsgd(%reg), %eax
905 call *___tls_get_addr@GOT(%reg)
906 which may be converted to
907 addr32 call ___tls_get_addr
908
909 %eax can't be used as the GOT base register since it
910 is used to pass parameter to ___tls_get_addr. */
911 reg = val & 7;
912 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
913 return FALSE;
914
915 indirect_call = call[0] == 0xff;
916 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
917 && !(call[0] == 0x67 && call[1] == 0xe8)
918 && !(indirect_call
919 && (call[1] & 0xf8) == 0x90
920 && (call[1] & 0x7) == reg))
921 return FALSE;
922 }
923 }
924 else
925 {
926 /* Check transition from LD access model. Only
927 leal foo@tlsldm(%ebx), %eax
928 call ___tls_get_addr@PLT
929 or
930 leal foo@tlsldm(%reg), %eax
931 call *___tls_get_addr@GOT(%reg)
932 which may be converted to
933 addr32 call ___tls_get_addr
934 can transit to different access model. */
935 if (type != 0x8d || (offset + 9) > sec->size)
936 return FALSE;
937
938 /* %eax can't be used as the GOT base register since it is
939 used to pass parameter to ___tls_get_addr. */
940 reg = val & 7;
941 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
942 return FALSE;
943
944 indirect_call = call[0] == 0xff;
945 if (!(reg == 3 && call[0] == 0xe8)
946 && !(call[0] == 0x67 && call[1] == 0xe8)
947 && !(indirect_call
948 && (call[1] & 0xf8) == 0x90
949 && (call[1] & 0x7) == reg))
950 return FALSE;
951 }
952
953 r_symndx = ELF32_R_SYM (rel[1].r_info);
954 if (r_symndx < symtab_hdr->sh_info)
955 return FALSE;
956
957 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
958 if (h == NULL
959 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
960 return FALSE;
961 else if (indirect_call)
962 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
963 else
964 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
965 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
966
967 case R_386_TLS_IE:
968 /* Check transition from IE access model:
969 movl foo@indntpoff(%rip), %eax
970 movl foo@indntpoff(%rip), %reg
971 addl foo@indntpoff(%rip), %reg
972 */
973
974 if (offset < 1 || (offset + 4) > sec->size)
975 return FALSE;
976
977 /* Check "movl foo@tpoff(%rip), %eax" first. */
978 val = bfd_get_8 (abfd, contents + offset - 1);
979 if (val == 0xa1)
980 return TRUE;
981
982 if (offset < 2)
983 return FALSE;
984
985 /* Check movl|addl foo@tpoff(%rip), %reg. */
986 type = bfd_get_8 (abfd, contents + offset - 2);
987 return ((type == 0x8b || type == 0x03)
988 && (val & 0xc7) == 0x05);
989
990 case R_386_TLS_GOTIE:
991 case R_386_TLS_IE_32:
992 /* Check transition from {IE_32,GOTIE} access model:
993 subl foo@{tpoff,gontoff}(%reg1), %reg2
994 movl foo@{tpoff,gontoff}(%reg1), %reg2
995 addl foo@{tpoff,gontoff}(%reg1), %reg2
996 */
997
998 if (offset < 2 || (offset + 4) > sec->size)
999 return FALSE;
1000
1001 val = bfd_get_8 (abfd, contents + offset - 1);
1002 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1003 return FALSE;
1004
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return type == 0x8b || type == 0x2b || type == 0x03;
1007
1008 case R_386_TLS_GOTDESC:
1009 /* Check transition from GDesc access model:
1010 leal x@tlsdesc(%ebx), %eax
1011
1012 Make sure it's a leal adding ebx to a 32-bit offset
1013 into any register, although it's probably almost always
1014 going to be eax. */
1015
1016 if (offset < 2 || (offset + 4) > sec->size)
1017 return FALSE;
1018
1019 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1020 return FALSE;
1021
1022 val = bfd_get_8 (abfd, contents + offset - 1);
1023 return (val & 0xc7) == 0x83;
1024
1025 case R_386_TLS_DESC_CALL:
1026 /* Check transition from GDesc access model:
1027 call *x@tlsdesc(%eax)
1028 */
1029 if (offset + 2 <= sec->size)
1030 {
1031 /* Make sure that it's a call *x@tlsdesc(%eax). */
1032 call = contents + offset;
1033 return call[0] == 0xff && call[1] == 0x10;
1034 }
1035
1036 return FALSE;
1037
1038 default:
1039 abort ();
1040 }
1041 }
1042
1043 /* Return TRUE if the TLS access transition is OK or no transition
1044 will be performed. Update R_TYPE if there is a transition. */
1045
1046 static bfd_boolean
1047 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1048 asection *sec, bfd_byte *contents,
1049 Elf_Internal_Shdr *symtab_hdr,
1050 struct elf_link_hash_entry **sym_hashes,
1051 unsigned int *r_type, int tls_type,
1052 const Elf_Internal_Rela *rel,
1053 const Elf_Internal_Rela *relend,
1054 struct elf_link_hash_entry *h,
1055 unsigned long r_symndx,
1056 bfd_boolean from_relocate_section)
1057 {
1058 unsigned int from_type = *r_type;
1059 unsigned int to_type = from_type;
1060 bfd_boolean check = TRUE;
1061
1062 /* Skip TLS transition for functions. */
1063 if (h != NULL
1064 && (h->type == STT_FUNC
1065 || h->type == STT_GNU_IFUNC))
1066 return TRUE;
1067
1068 switch (from_type)
1069 {
1070 case R_386_TLS_GD:
1071 case R_386_TLS_GOTDESC:
1072 case R_386_TLS_DESC_CALL:
1073 case R_386_TLS_IE_32:
1074 case R_386_TLS_IE:
1075 case R_386_TLS_GOTIE:
1076 if (bfd_link_executable (info))
1077 {
1078 if (h == NULL)
1079 to_type = R_386_TLS_LE_32;
1080 else if (from_type != R_386_TLS_IE
1081 && from_type != R_386_TLS_GOTIE)
1082 to_type = R_386_TLS_IE_32;
1083 }
1084
1085 /* When we are called from elf_i386_relocate_section, there may
1086 be additional transitions based on TLS_TYPE. */
1087 if (from_relocate_section)
1088 {
1089 unsigned int new_to_type = to_type;
1090
1091 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1092 new_to_type = R_386_TLS_LE_32;
1093
1094 if (to_type == R_386_TLS_GD
1095 || to_type == R_386_TLS_GOTDESC
1096 || to_type == R_386_TLS_DESC_CALL)
1097 {
1098 if (tls_type == GOT_TLS_IE_POS)
1099 new_to_type = R_386_TLS_GOTIE;
1100 else if (tls_type & GOT_TLS_IE)
1101 new_to_type = R_386_TLS_IE_32;
1102 }
1103
1104 /* We checked the transition before when we were called from
1105 elf_i386_check_relocs. We only want to check the new
1106 transition which hasn't been checked before. */
1107 check = new_to_type != to_type && from_type == to_type;
1108 to_type = new_to_type;
1109 }
1110
1111 break;
1112
1113 case R_386_TLS_LDM:
1114 if (bfd_link_executable (info))
1115 to_type = R_386_TLS_LE_32;
1116 break;
1117
1118 default:
1119 return TRUE;
1120 }
1121
1122 /* Return TRUE if there is no transition. */
1123 if (from_type == to_type)
1124 return TRUE;
1125
1126 /* Check if the transition can be performed. */
1127 if (check
1128 && ! elf_i386_check_tls_transition (sec, contents,
1129 symtab_hdr, sym_hashes,
1130 from_type, rel, relend))
1131 {
1132 reloc_howto_type *from, *to;
1133 const char *name;
1134
1135 from = elf_i386_rtype_to_howto (abfd, from_type);
1136 to = elf_i386_rtype_to_howto (abfd, to_type);
1137
1138 if (h)
1139 name = h->root.root.string;
1140 else
1141 {
1142 struct elf_x86_link_hash_table *htab;
1143
1144 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1145 if (htab == NULL)
1146 name = "*unknown*";
1147 else
1148 {
1149 Elf_Internal_Sym *isym;
1150
1151 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1152 abfd, r_symndx);
1153 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1154 }
1155 }
1156
1157 _bfd_error_handler
1158 /* xgettext:c-format */
1159 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1160 "in section `%A' failed"),
1161 abfd, from->name, to->name, name,
1162 rel->r_offset, sec);
1163 bfd_set_error (bfd_error_bad_value);
1164 return FALSE;
1165 }
1166
1167 *r_type = to_type;
1168 return TRUE;
1169 }
1170
1171 /* With the local symbol, foo, we convert
1172 mov foo@GOT[(%reg1)], %reg2
1173 to
1174 lea foo[@GOTOFF(%reg1)], %reg2
1175 and convert
1176 call/jmp *foo@GOT[(%reg)]
1177 to
1178 nop call foo/jmp foo nop
1179 When PIC is false, convert
1180 test %reg1, foo@GOT[(%reg2)]
1181 to
1182 test $foo, %reg1
1183 and convert
1184 binop foo@GOT[(%reg1)], %reg2
1185 to
1186 binop $foo, %reg2
1187 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1188 instructions. */
1189
1190 static
1191 bfd_boolean
1192 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1193 bfd_byte *contents,
1194 unsigned int *r_type_p,
1195 Elf_Internal_Rela *irel,
1196 struct elf_link_hash_entry *h,
1197 bfd_boolean *converted,
1198 struct bfd_link_info *link_info)
1199 {
1200 struct elf_x86_link_hash_table *htab;
1201 unsigned int opcode;
1202 unsigned int modrm;
1203 bfd_boolean baseless;
1204 Elf_Internal_Sym *isym;
1205 unsigned int addend;
1206 unsigned int nop;
1207 bfd_vma nop_offset;
1208 bfd_boolean is_pic;
1209 bfd_boolean to_reloc_32;
1210 unsigned int r_type;
1211 unsigned int r_symndx;
1212 bfd_vma roff = irel->r_offset;
1213 bfd_boolean local_ref;
1214 struct elf_x86_link_hash_entry *eh;
1215
1216 if (roff < 2)
1217 return TRUE;
1218
1219 /* Addend for R_386_GOT32X relocations must be 0. */
1220 addend = bfd_get_32 (abfd, contents + roff);
1221 if (addend != 0)
1222 return TRUE;
1223
1224 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1225 is_pic = bfd_link_pic (link_info);
1226
1227 r_type = *r_type_p;
1228 r_symndx = ELF32_R_SYM (irel->r_info);
1229
1230 modrm = bfd_get_8 (abfd, contents + roff - 1);
1231 baseless = (modrm & 0xc7) == 0x5;
1232
1233 if (baseless && is_pic)
1234 {
1235 /* For PIC, disallow R_386_GOT32X without a base register
1236 since we don't know what the GOT base is. */
1237 const char *name;
1238
1239 if (h == NULL)
1240 {
1241 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1242 r_symndx);
1243 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1244 }
1245 else
1246 name = h->root.root.string;
1247
1248 _bfd_error_handler
1249 /* xgettext:c-format */
1250 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1251 " register can not be used when making a shared object"),
1252 abfd, name);
1253 return FALSE;
1254 }
1255
1256 opcode = bfd_get_8 (abfd, contents + roff - 2);
1257
1258 /* Convert to R_386_32 if PIC is false or there is no base
1259 register. */
1260 to_reloc_32 = !is_pic || baseless;
1261
1262 eh = elf_x86_hash_entry (h);
1263
1264 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1265 reloc. */
1266 if (h == NULL)
1267 {
1268 if (opcode == 0x0ff)
1269 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1270 goto convert_branch;
1271 else
1272 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1273 "test %reg1, foo@GOT(%reg2)" and
1274 "binop foo@GOT[(%reg1)], %reg2". */
1275 goto convert_load;
1276 }
1277
1278 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1279 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1280
1281 /* Undefined weak symbol is only bound locally in executable
1282 and its reference is resolved as 0. */
1283 if (h->root.type == bfd_link_hash_undefweak
1284 && !eh->linker_def
1285 && local_ref)
1286 {
1287 if (opcode == 0xff)
1288 {
1289 /* No direct branch to 0 for PIC. */
1290 if (is_pic)
1291 return TRUE;
1292 else
1293 goto convert_branch;
1294 }
1295 else
1296 {
1297 /* We can convert load of address 0 to R_386_32. */
1298 to_reloc_32 = TRUE;
1299 goto convert_load;
1300 }
1301 }
1302
1303 if (opcode == 0xff)
1304 {
1305 /* We have "call/jmp *foo@GOT[(%reg)]". */
1306 if ((h->root.type == bfd_link_hash_defined
1307 || h->root.type == bfd_link_hash_defweak)
1308 && local_ref)
1309 {
1310 /* The function is locally defined. */
1311 convert_branch:
1312 /* Convert R_386_GOT32X to R_386_PC32. */
1313 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1314 {
1315 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1316 is a nop prefix. */
1317 modrm = 0xe8;
1318 /* To support TLS optimization, always use addr32 prefix
1319 for "call *___tls_get_addr@GOT(%reg)". */
1320 if (eh && eh->tls_get_addr)
1321 {
1322 nop = 0x67;
1323 nop_offset = irel->r_offset - 2;
1324 }
1325 else
1326 {
1327 nop = link_info->call_nop_byte;
1328 if (link_info->call_nop_as_suffix)
1329 {
1330 nop_offset = roff + 3;
1331 irel->r_offset -= 1;
1332 }
1333 else
1334 nop_offset = roff - 2;
1335 }
1336 }
1337 else
1338 {
1339 /* Convert to "jmp foo nop". */
1340 modrm = 0xe9;
1341 nop = NOP_OPCODE;
1342 nop_offset = roff + 3;
1343 irel->r_offset -= 1;
1344 }
1345
1346 bfd_put_8 (abfd, nop, contents + nop_offset);
1347 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1348 /* When converting to PC-relative relocation, we
1349 need to adjust addend by -4. */
1350 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1351 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1352 *r_type_p = R_386_PC32;
1353 *converted = TRUE;
1354 }
1355 }
1356 else
1357 {
1358 /* We have "mov foo@GOT[(%re1g)], %reg2",
1359 "test %reg1, foo@GOT(%reg2)" and
1360 "binop foo@GOT[(%reg1)], %reg2".
1361
1362 Avoid optimizing _DYNAMIC since ld.so may use its
1363 link-time address. */
1364 if (h == htab->elf.hdynamic)
1365 return TRUE;
1366
1367 /* def_regular is set by an assignment in a linker script in
1368 bfd_elf_record_link_assignment. start_stop is set on
1369 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1370 if (h->start_stop
1371 || eh->linker_def
1372 || ((h->def_regular
1373 || h->root.type == bfd_link_hash_defined
1374 || h->root.type == bfd_link_hash_defweak)
1375 && local_ref))
1376 {
1377 convert_load:
1378 if (opcode == 0x8b)
1379 {
1380 if (to_reloc_32)
1381 {
1382 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1383 "mov $foo, %reg2" with R_386_32. */
1384 r_type = R_386_32;
1385 modrm = 0xc0 | (modrm & 0x38) >> 3;
1386 bfd_put_8 (abfd, modrm, contents + roff - 1);
1387 opcode = 0xc7;
1388 }
1389 else
1390 {
1391 /* Convert "mov foo@GOT(%reg1), %reg2" to
1392 "lea foo@GOTOFF(%reg1), %reg2". */
1393 r_type = R_386_GOTOFF;
1394 opcode = 0x8d;
1395 }
1396 }
1397 else
1398 {
1399 /* Only R_386_32 is supported. */
1400 if (!to_reloc_32)
1401 return TRUE;
1402
1403 if (opcode == 0x85)
1404 {
1405 /* Convert "test %reg1, foo@GOT(%reg2)" to
1406 "test $foo, %reg1". */
1407 modrm = 0xc0 | (modrm & 0x38) >> 3;
1408 opcode = 0xf7;
1409 }
1410 else
1411 {
1412 /* Convert "binop foo@GOT(%reg1), %reg2" to
1413 "binop $foo, %reg2". */
1414 modrm = (0xc0
1415 | (modrm & 0x38) >> 3
1416 | (opcode & 0x3c));
1417 opcode = 0x81;
1418 }
1419 bfd_put_8 (abfd, modrm, contents + roff - 1);
1420 r_type = R_386_32;
1421 }
1422
1423 bfd_put_8 (abfd, opcode, contents + roff - 2);
1424 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1425 *r_type_p = r_type;
1426 *converted = TRUE;
1427 }
1428 }
1429
1430 return TRUE;
1431 }
1432
1433 /* Rename some of the generic section flags to better document how they
1434 are used here. */
1435 #define check_relocs_failed sec_flg0
1436
1437 /* Look through the relocs for a section during the first phase, and
1438 calculate needed space in the global offset table, procedure linkage
1439 table, and dynamic reloc sections. */
1440
1441 static bfd_boolean
1442 elf_i386_check_relocs (bfd *abfd,
1443 struct bfd_link_info *info,
1444 asection *sec,
1445 const Elf_Internal_Rela *relocs)
1446 {
1447 struct elf_x86_link_hash_table *htab;
1448 Elf_Internal_Shdr *symtab_hdr;
1449 struct elf_link_hash_entry **sym_hashes;
1450 const Elf_Internal_Rela *rel;
1451 const Elf_Internal_Rela *rel_end;
1452 asection *sreloc;
1453 bfd_byte *contents;
1454 bfd_boolean converted;
1455
1456 if (bfd_link_relocatable (info))
1457 return TRUE;
1458
1459 /* Don't do anything special with non-loaded, non-alloced sections.
1460 In particular, any relocs in such sections should not affect GOT
1461 and PLT reference counting (ie. we don't allow them to create GOT
1462 or PLT entries), there's no possibility or desire to optimize TLS
1463 relocs, and there's not much point in propagating relocs to shared
1464 libs that the dynamic linker won't relocate. */
1465 if ((sec->flags & SEC_ALLOC) == 0)
1466 return TRUE;
1467
1468 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1469 if (htab == NULL)
1470 {
1471 sec->check_relocs_failed = 1;
1472 return FALSE;
1473 }
1474
1475 BFD_ASSERT (is_x86_elf (abfd, htab));
1476
1477 /* Get the section contents. */
1478 if (elf_section_data (sec)->this_hdr.contents != NULL)
1479 contents = elf_section_data (sec)->this_hdr.contents;
1480 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1481 {
1482 sec->check_relocs_failed = 1;
1483 return FALSE;
1484 }
1485
1486 symtab_hdr = &elf_symtab_hdr (abfd);
1487 sym_hashes = elf_sym_hashes (abfd);
1488
1489 converted = FALSE;
1490
1491 sreloc = NULL;
1492
1493 rel_end = relocs + sec->reloc_count;
1494 for (rel = relocs; rel < rel_end; rel++)
1495 {
1496 unsigned int r_type;
1497 unsigned int r_symndx;
1498 struct elf_link_hash_entry *h;
1499 struct elf_x86_link_hash_entry *eh;
1500 Elf_Internal_Sym *isym;
1501 const char *name;
1502 bfd_boolean size_reloc;
1503
1504 r_symndx = ELF32_R_SYM (rel->r_info);
1505 r_type = ELF32_R_TYPE (rel->r_info);
1506
1507 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1508 {
1509 /* xgettext:c-format */
1510 _bfd_error_handler (_("%B: bad symbol index: %d"),
1511 abfd, r_symndx);
1512 goto error_return;
1513 }
1514
1515 if (r_symndx < symtab_hdr->sh_info)
1516 {
1517 /* A local symbol. */
1518 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1519 abfd, r_symndx);
1520 if (isym == NULL)
1521 goto error_return;
1522
1523 /* Check relocation against local STT_GNU_IFUNC symbol. */
1524 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1525 {
1526 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1527 if (h == NULL)
1528 goto error_return;
1529
1530 /* Fake a STT_GNU_IFUNC symbol. */
1531 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1532 isym, NULL);
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_x86_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 if (r_type == R_386_GOTOFF)
1555 eh->gotoff_ref = 1;
1556
1557 /* It is referenced by a non-shared object. */
1558 h->ref_regular = 1;
1559
1560 if (h->type == STT_GNU_IFUNC)
1561 elf_tdata (info->output_bfd)->has_gnu_symbols
1562 |= elf_gnu_symbol_ifunc;
1563 }
1564
1565 if (r_type == R_386_GOT32X
1566 && (h == NULL || h->type != STT_GNU_IFUNC))
1567 {
1568 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1569 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1570 &r_type, irel, h,
1571 &converted, info))
1572 goto error_return;
1573 }
1574
1575 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1576 symtab_hdr, sym_hashes,
1577 &r_type, GOT_UNKNOWN,
1578 rel, rel_end, h, r_symndx, FALSE))
1579 goto error_return;
1580
1581 switch (r_type)
1582 {
1583 case R_386_TLS_LDM:
1584 htab->tls_ld_or_ldm_got.refcount = 1;
1585 goto create_got;
1586
1587 case R_386_PLT32:
1588 /* This symbol requires a procedure linkage table entry. We
1589 actually build the entry in adjust_dynamic_symbol,
1590 because this might be a case of linking PIC code which is
1591 never referenced by a dynamic object, in which case we
1592 don't need to generate a procedure linkage table entry
1593 after all. */
1594
1595 /* If this is a local symbol, we resolve it directly without
1596 creating a procedure linkage table entry. */
1597 if (h == NULL)
1598 continue;
1599
1600 eh->zero_undefweak &= 0x2;
1601 h->needs_plt = 1;
1602 h->plt.refcount = 1;
1603 break;
1604
1605 case R_386_SIZE32:
1606 size_reloc = TRUE;
1607 goto do_size;
1608
1609 case R_386_TLS_IE_32:
1610 case R_386_TLS_IE:
1611 case R_386_TLS_GOTIE:
1612 if (!bfd_link_executable (info))
1613 info->flags |= DF_STATIC_TLS;
1614 /* Fall through */
1615
1616 case R_386_GOT32:
1617 case R_386_GOT32X:
1618 case R_386_TLS_GD:
1619 case R_386_TLS_GOTDESC:
1620 case R_386_TLS_DESC_CALL:
1621 /* This symbol requires a global offset table entry. */
1622 {
1623 int tls_type, old_tls_type;
1624
1625 switch (r_type)
1626 {
1627 default:
1628 case R_386_GOT32:
1629 case R_386_GOT32X:
1630 tls_type = GOT_NORMAL;
1631 break;
1632 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1633 case R_386_TLS_GOTDESC:
1634 case R_386_TLS_DESC_CALL:
1635 tls_type = GOT_TLS_GDESC; break;
1636 case R_386_TLS_IE_32:
1637 if (ELF32_R_TYPE (rel->r_info) == r_type)
1638 tls_type = GOT_TLS_IE_NEG;
1639 else
1640 /* If this is a GD->IE transition, we may use either of
1641 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1642 tls_type = GOT_TLS_IE;
1643 break;
1644 case R_386_TLS_IE:
1645 case R_386_TLS_GOTIE:
1646 tls_type = GOT_TLS_IE_POS; break;
1647 }
1648
1649 if (h != NULL)
1650 {
1651 h->got.refcount = 1;
1652 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1653 }
1654 else
1655 {
1656 bfd_signed_vma *local_got_refcounts;
1657
1658 /* This is a global offset table entry for a local symbol. */
1659 local_got_refcounts = elf_local_got_refcounts (abfd);
1660 if (local_got_refcounts == NULL)
1661 {
1662 bfd_size_type size;
1663
1664 size = symtab_hdr->sh_info;
1665 size *= (sizeof (bfd_signed_vma)
1666 + sizeof (bfd_vma) + sizeof(char));
1667 local_got_refcounts = (bfd_signed_vma *)
1668 bfd_zalloc (abfd, size);
1669 if (local_got_refcounts == NULL)
1670 goto error_return;
1671 elf_local_got_refcounts (abfd) = local_got_refcounts;
1672 elf_x86_local_tlsdesc_gotent (abfd)
1673 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1674 elf_x86_local_got_tls_type (abfd)
1675 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1676 }
1677 local_got_refcounts[r_symndx] = 1;
1678 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1679 }
1680
1681 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1682 tls_type |= old_tls_type;
1683 /* If a TLS symbol is accessed using IE at least once,
1684 there is no point to use dynamic model for it. */
1685 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1686 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1687 || (tls_type & GOT_TLS_IE) == 0))
1688 {
1689 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1690 tls_type = old_tls_type;
1691 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1692 && GOT_TLS_GD_ANY_P (tls_type))
1693 tls_type |= old_tls_type;
1694 else
1695 {
1696 if (h)
1697 name = h->root.root.string;
1698 else
1699 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1700 NULL);
1701 _bfd_error_handler
1702 /* xgettext:c-format */
1703 (_("%B: `%s' accessed both as normal and "
1704 "thread local symbol"),
1705 abfd, name);
1706 bfd_set_error (bfd_error_bad_value);
1707 goto error_return;
1708 }
1709 }
1710
1711 if (old_tls_type != tls_type)
1712 {
1713 if (h != NULL)
1714 elf_x86_hash_entry (h)->tls_type = tls_type;
1715 else
1716 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1717 }
1718 }
1719 /* Fall through */
1720
1721 case R_386_GOTOFF:
1722 case R_386_GOTPC:
1723 create_got:
1724 if (r_type != R_386_TLS_IE)
1725 {
1726 if (eh != NULL)
1727 eh->zero_undefweak &= 0x2;
1728 break;
1729 }
1730 /* Fall through */
1731
1732 case R_386_TLS_LE_32:
1733 case R_386_TLS_LE:
1734 if (eh != NULL)
1735 eh->zero_undefweak &= 0x2;
1736 if (bfd_link_executable (info))
1737 break;
1738 info->flags |= DF_STATIC_TLS;
1739 goto do_relocation;
1740
1741 case R_386_32:
1742 case R_386_PC32:
1743 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1744 eh->zero_undefweak |= 0x2;
1745 do_relocation:
1746 /* We are called after all symbols have been resolved. Only
1747 relocation against STT_GNU_IFUNC symbol must go through
1748 PLT. */
1749 if (h != NULL
1750 && (bfd_link_executable (info)
1751 || h->type == STT_GNU_IFUNC))
1752 {
1753 bfd_boolean func_pointer_ref = FALSE;
1754
1755 if (r_type == R_386_PC32)
1756 {
1757 /* Since something like ".long foo - ." may be used
1758 as pointer, make sure that PLT is used if foo is
1759 a function defined in a shared library. */
1760 if ((sec->flags & SEC_CODE) == 0)
1761 h->pointer_equality_needed = 1;
1762 else if (h->type == STT_GNU_IFUNC
1763 && bfd_link_pic (info))
1764 {
1765 _bfd_error_handler
1766 /* xgettext:c-format */
1767 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1768 abfd, h->root.root.string);
1769 bfd_set_error (bfd_error_bad_value);
1770 goto error_return;
1771 }
1772 }
1773 else
1774 {
1775 h->pointer_equality_needed = 1;
1776 /* R_386_32 can be resolved at run-time. */
1777 if (r_type == R_386_32
1778 && (sec->flags & SEC_READONLY) == 0)
1779 func_pointer_ref = TRUE;
1780 }
1781
1782 if (!func_pointer_ref)
1783 {
1784 /* If this reloc is in a read-only section, we might
1785 need a copy reloc. We can't check reliably at this
1786 stage whether the section is read-only, as input
1787 sections have not yet been mapped to output sections.
1788 Tentatively set the flag for now, and correct in
1789 adjust_dynamic_symbol. */
1790 h->non_got_ref = 1;
1791
1792 /* We may need a .plt entry if the symbol is a function
1793 defined in a shared lib or is a function referenced
1794 from the code or read-only section. */
1795 if (!h->def_regular
1796 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1797 h->plt.refcount = 1;
1798 }
1799 }
1800
1801 size_reloc = FALSE;
1802 do_size:
1803 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
1804 R_386_32))
1805 {
1806 struct elf_dyn_relocs *p;
1807 struct elf_dyn_relocs **head;
1808
1809 /* We must copy these reloc types into the output file.
1810 Create a reloc section in dynobj and make room for
1811 this reloc. */
1812 if (sreloc == NULL)
1813 {
1814 sreloc = _bfd_elf_make_dynamic_reloc_section
1815 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1816
1817 if (sreloc == NULL)
1818 goto error_return;
1819 }
1820
1821 /* If this is a global symbol, we count the number of
1822 relocations we need for this symbol. */
1823 if (h != NULL)
1824 {
1825 head = &eh->dyn_relocs;
1826 }
1827 else
1828 {
1829 /* Track dynamic relocs needed for local syms too.
1830 We really need local syms available to do this
1831 easily. Oh well. */
1832 void **vpp;
1833 asection *s;
1834
1835 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1836 abfd, r_symndx);
1837 if (isym == NULL)
1838 goto error_return;
1839
1840 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1841 if (s == NULL)
1842 s = sec;
1843
1844 vpp = &elf_section_data (s)->local_dynrel;
1845 head = (struct elf_dyn_relocs **)vpp;
1846 }
1847
1848 p = *head;
1849 if (p == NULL || p->sec != sec)
1850 {
1851 bfd_size_type amt = sizeof *p;
1852 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1853 amt);
1854 if (p == NULL)
1855 goto error_return;
1856 p->next = *head;
1857 *head = p;
1858 p->sec = sec;
1859 p->count = 0;
1860 p->pc_count = 0;
1861 }
1862
1863 p->count += 1;
1864 /* Count size relocation as PC-relative relocation. */
1865 if (r_type == R_386_PC32 || size_reloc)
1866 p->pc_count += 1;
1867 }
1868 break;
1869
1870 /* This relocation describes the C++ object vtable hierarchy.
1871 Reconstruct it for later use during GC. */
1872 case R_386_GNU_VTINHERIT:
1873 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1874 goto error_return;
1875 break;
1876
1877 /* This relocation describes which C++ vtable entries are actually
1878 used. Record for later use during GC. */
1879 case R_386_GNU_VTENTRY:
1880 BFD_ASSERT (h != NULL);
1881 if (h != NULL
1882 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1883 goto error_return;
1884 break;
1885
1886 default:
1887 break;
1888 }
1889 }
1890
1891 if (elf_section_data (sec)->this_hdr.contents != contents)
1892 {
1893 if (!converted && !info->keep_memory)
1894 free (contents);
1895 else
1896 {
1897 /* Cache the section contents for elf_link_input_bfd if any
1898 load is converted or --no-keep-memory isn't used. */
1899 elf_section_data (sec)->this_hdr.contents = contents;
1900 }
1901 }
1902
1903 /* Cache relocations if any load is converted. */
1904 if (elf_section_data (sec)->relocs != relocs && converted)
1905 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1906
1907 return TRUE;
1908
1909 error_return:
1910 if (elf_section_data (sec)->this_hdr.contents != contents)
1911 free (contents);
1912 sec->check_relocs_failed = 1;
1913 return FALSE;
1914 }
1915
1916 /* Set the correct type for an x86 ELF section. We do this by the
1917 section name, which is a hack, but ought to work. */
1918
1919 static bfd_boolean
1920 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1921 Elf_Internal_Shdr *hdr,
1922 asection *sec)
1923 {
1924 const char *name;
1925
1926 name = bfd_get_section_name (abfd, sec);
1927
1928 /* This is an ugly, but unfortunately necessary hack that is
1929 needed when producing EFI binaries on x86. It tells
1930 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1931 containing ELF relocation info. We need this hack in order to
1932 be able to generate ELF binaries that can be translated into
1933 EFI applications (which are essentially COFF objects). Those
1934 files contain a COFF ".reloc" section inside an ELFNN object,
1935 which would normally cause BFD to segfault because it would
1936 attempt to interpret this section as containing relocation
1937 entries for section "oc". With this hack enabled, ".reloc"
1938 will be treated as a normal data section, which will avoid the
1939 segfault. However, you won't be able to create an ELFNN binary
1940 with a section named "oc" that needs relocations, but that's
1941 the kind of ugly side-effects you get when detecting section
1942 types based on their names... In practice, this limitation is
1943 unlikely to bite. */
1944 if (strcmp (name, ".reloc") == 0)
1945 hdr->sh_type = SHT_PROGBITS;
1946
1947 return TRUE;
1948 }
1949
1950 /* Return the relocation value for @tpoff relocation
1951 if STT_TLS virtual address is ADDRESS. */
1952
1953 static bfd_vma
1954 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1955 {
1956 struct elf_link_hash_table *htab = elf_hash_table (info);
1957 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1958 bfd_vma static_tls_size;
1959
1960 /* If tls_sec is NULL, we should have signalled an error already. */
1961 if (htab->tls_sec == NULL)
1962 return 0;
1963
1964 /* Consider special static TLS alignment requirements. */
1965 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1966 return static_tls_size + htab->tls_sec->vma - address;
1967 }
1968
1969 /* Relocate an i386 ELF section. */
1970
1971 static bfd_boolean
1972 elf_i386_relocate_section (bfd *output_bfd,
1973 struct bfd_link_info *info,
1974 bfd *input_bfd,
1975 asection *input_section,
1976 bfd_byte *contents,
1977 Elf_Internal_Rela *relocs,
1978 Elf_Internal_Sym *local_syms,
1979 asection **local_sections)
1980 {
1981 struct elf_x86_link_hash_table *htab;
1982 Elf_Internal_Shdr *symtab_hdr;
1983 struct elf_link_hash_entry **sym_hashes;
1984 bfd_vma *local_got_offsets;
1985 bfd_vma *local_tlsdesc_gotents;
1986 Elf_Internal_Rela *rel;
1987 Elf_Internal_Rela *wrel;
1988 Elf_Internal_Rela *relend;
1989 bfd_boolean is_vxworks_tls;
1990 unsigned plt_entry_size;
1991
1992 /* Skip if check_relocs failed. */
1993 if (input_section->check_relocs_failed)
1994 return FALSE;
1995
1996 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1997 if (htab == NULL)
1998 return FALSE;
1999
2000 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2001
2002 symtab_hdr = &elf_symtab_hdr (input_bfd);
2003 sym_hashes = elf_sym_hashes (input_bfd);
2004 local_got_offsets = elf_local_got_offsets (input_bfd);
2005 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2006 /* We have to handle relocations in vxworks .tls_vars sections
2007 specially, because the dynamic loader is 'weird'. */
2008 is_vxworks_tls = (htab->target_os == is_vxworks
2009 && bfd_link_pic (info)
2010 && !strcmp (input_section->output_section->name,
2011 ".tls_vars"));
2012
2013 _bfd_x86_elf_set_tls_module_base (info);
2014
2015 plt_entry_size = htab->plt.plt_entry_size;
2016
2017 rel = wrel = relocs;
2018 relend = relocs + input_section->reloc_count;
2019 for (; rel < relend; wrel++, rel++)
2020 {
2021 unsigned int r_type, r_type_tls;
2022 reloc_howto_type *howto;
2023 unsigned long r_symndx;
2024 struct elf_link_hash_entry *h;
2025 struct elf_x86_link_hash_entry *eh;
2026 Elf_Internal_Sym *sym;
2027 asection *sec;
2028 bfd_vma off, offplt, plt_offset;
2029 bfd_vma relocation;
2030 bfd_boolean unresolved_reloc;
2031 bfd_reloc_status_type r;
2032 unsigned int indx;
2033 int tls_type;
2034 bfd_vma st_size;
2035 asection *resolved_plt;
2036 bfd_boolean resolved_to_zero;
2037 bfd_boolean relative_reloc;
2038
2039 r_type = ELF32_R_TYPE (rel->r_info);
2040 if (r_type == R_386_GNU_VTINHERIT
2041 || r_type == R_386_GNU_VTENTRY)
2042 {
2043 if (wrel != rel)
2044 *wrel = *rel;
2045 continue;
2046 }
2047
2048 if ((indx = r_type) >= R_386_standard
2049 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2050 >= R_386_ext - R_386_standard)
2051 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2052 >= R_386_ext2 - R_386_ext))
2053 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2054
2055 howto = elf_howto_table + indx;
2056
2057 r_symndx = ELF32_R_SYM (rel->r_info);
2058 h = NULL;
2059 sym = NULL;
2060 sec = NULL;
2061 unresolved_reloc = FALSE;
2062 if (r_symndx < symtab_hdr->sh_info)
2063 {
2064 sym = local_syms + r_symndx;
2065 sec = local_sections[r_symndx];
2066 relocation = (sec->output_section->vma
2067 + sec->output_offset
2068 + sym->st_value);
2069 st_size = sym->st_size;
2070
2071 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2072 && ((sec->flags & SEC_MERGE) != 0
2073 || (bfd_link_relocatable (info)
2074 && sec->output_offset != 0)))
2075 {
2076 bfd_vma addend;
2077 bfd_byte *where = contents + rel->r_offset;
2078
2079 switch (howto->size)
2080 {
2081 case 0:
2082 addend = bfd_get_8 (input_bfd, where);
2083 if (howto->pc_relative)
2084 {
2085 addend = (addend ^ 0x80) - 0x80;
2086 addend += 1;
2087 }
2088 break;
2089 case 1:
2090 addend = bfd_get_16 (input_bfd, where);
2091 if (howto->pc_relative)
2092 {
2093 addend = (addend ^ 0x8000) - 0x8000;
2094 addend += 2;
2095 }
2096 break;
2097 case 2:
2098 addend = bfd_get_32 (input_bfd, where);
2099 if (howto->pc_relative)
2100 {
2101 addend = (addend ^ 0x80000000) - 0x80000000;
2102 addend += 4;
2103 }
2104 break;
2105 default:
2106 abort ();
2107 }
2108
2109 if (bfd_link_relocatable (info))
2110 addend += sec->output_offset;
2111 else
2112 {
2113 asection *msec = sec;
2114 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2115 addend);
2116 addend -= relocation;
2117 addend += msec->output_section->vma + msec->output_offset;
2118 }
2119
2120 switch (howto->size)
2121 {
2122 case 0:
2123 /* FIXME: overflow checks. */
2124 if (howto->pc_relative)
2125 addend -= 1;
2126 bfd_put_8 (input_bfd, addend, where);
2127 break;
2128 case 1:
2129 if (howto->pc_relative)
2130 addend -= 2;
2131 bfd_put_16 (input_bfd, addend, where);
2132 break;
2133 case 2:
2134 if (howto->pc_relative)
2135 addend -= 4;
2136 bfd_put_32 (input_bfd, addend, where);
2137 break;
2138 }
2139 }
2140 else if (!bfd_link_relocatable (info)
2141 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2142 {
2143 /* Relocate against local STT_GNU_IFUNC symbol. */
2144 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2145 FALSE);
2146 if (h == NULL)
2147 abort ();
2148
2149 /* Set STT_GNU_IFUNC symbol value. */
2150 h->root.u.def.value = sym->st_value;
2151 h->root.u.def.section = sec;
2152 }
2153 }
2154 else
2155 {
2156 bfd_boolean warned ATTRIBUTE_UNUSED;
2157 bfd_boolean ignored ATTRIBUTE_UNUSED;
2158
2159 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2160 r_symndx, symtab_hdr, sym_hashes,
2161 h, sec, relocation,
2162 unresolved_reloc, warned, ignored);
2163 st_size = h->size;
2164 }
2165
2166 if (sec != NULL && discarded_section (sec))
2167 {
2168 _bfd_clear_contents (howto, input_bfd, input_section,
2169 contents + rel->r_offset);
2170 wrel->r_offset = rel->r_offset;
2171 wrel->r_info = 0;
2172 wrel->r_addend = 0;
2173
2174 /* For ld -r, remove relocations in debug sections against
2175 sections defined in discarded sections. Not done for
2176 eh_frame editing code expects to be present. */
2177 if (bfd_link_relocatable (info)
2178 && (input_section->flags & SEC_DEBUGGING))
2179 wrel--;
2180
2181 continue;
2182 }
2183
2184 if (bfd_link_relocatable (info))
2185 {
2186 if (wrel != rel)
2187 *wrel = *rel;
2188 continue;
2189 }
2190
2191 eh = (struct elf_x86_link_hash_entry *) h;
2192
2193 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2194 it here if it is defined in a non-shared object. */
2195 if (h != NULL
2196 && h->type == STT_GNU_IFUNC
2197 && h->def_regular)
2198 {
2199 asection *gotplt, *base_got;
2200 bfd_vma plt_index;
2201 const char *name;
2202
2203 if ((input_section->flags & SEC_ALLOC) == 0)
2204 {
2205 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2206 sections because such sections are not SEC_ALLOC and
2207 thus ld.so will not process them. */
2208 if ((input_section->flags & SEC_DEBUGGING) != 0)
2209 continue;
2210 abort ();
2211 }
2212
2213 /* STT_GNU_IFUNC symbol must go through PLT. */
2214 if (htab->elf.splt != NULL)
2215 {
2216 if (htab->plt_second != NULL)
2217 {
2218 resolved_plt = htab->plt_second;
2219 plt_offset = eh->plt_second.offset;
2220 }
2221 else
2222 {
2223 resolved_plt = htab->elf.splt;
2224 plt_offset = h->plt.offset;
2225 }
2226 gotplt = htab->elf.sgotplt;
2227 }
2228 else
2229 {
2230 resolved_plt = htab->elf.iplt;
2231 plt_offset = h->plt.offset;
2232 gotplt = htab->elf.igotplt;
2233 }
2234
2235 switch (r_type)
2236 {
2237 default:
2238 break;
2239
2240 case R_386_GOT32:
2241 case R_386_GOT32X:
2242 base_got = htab->elf.sgot;
2243 off = h->got.offset;
2244
2245 if (base_got == NULL)
2246 abort ();
2247
2248 if (off == (bfd_vma) -1)
2249 {
2250 /* We can't use h->got.offset here to save state, or
2251 even just remember the offset, as finish_dynamic_symbol
2252 would use that as offset into .got. */
2253
2254 if (h->plt.offset == (bfd_vma) -1)
2255 abort ();
2256
2257 if (htab->elf.splt != NULL)
2258 {
2259 plt_index = (h->plt.offset / plt_entry_size
2260 - htab->plt.has_plt0);
2261 off = (plt_index + 3) * 4;
2262 base_got = htab->elf.sgotplt;
2263 }
2264 else
2265 {
2266 plt_index = h->plt.offset / plt_entry_size;
2267 off = plt_index * 4;
2268 base_got = htab->elf.igotplt;
2269 }
2270
2271 if (h->dynindx == -1
2272 || h->forced_local
2273 || info->symbolic)
2274 {
2275 /* This references the local defitionion. We must
2276 initialize this entry in the global offset table.
2277 Since the offset must always be a multiple of 8,
2278 we use the least significant bit to record
2279 whether we have initialized it already.
2280
2281 When doing a dynamic link, we create a .rela.got
2282 relocation entry to initialize the value. This
2283 is done in the finish_dynamic_symbol routine. */
2284 if ((off & 1) != 0)
2285 off &= ~1;
2286 else
2287 {
2288 bfd_put_32 (output_bfd, relocation,
2289 base_got->contents + off);
2290 h->got.offset |= 1;
2291 }
2292 }
2293
2294 relocation = off;
2295 }
2296 else
2297 relocation = (base_got->output_section->vma
2298 + base_got->output_offset + off
2299 - gotplt->output_section->vma
2300 - gotplt->output_offset);
2301
2302 if (rel->r_offset > 1
2303 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2304 && *(contents + rel->r_offset - 2) != 0x8d)
2305 {
2306 if (bfd_link_pic (info))
2307 goto disallow_got32;
2308
2309 /* Add the GOT base if there is no base register. */
2310 relocation += (gotplt->output_section->vma
2311 + gotplt->output_offset);
2312 }
2313 else if (htab->elf.splt == NULL)
2314 {
2315 /* Adjust for static executables. */
2316 relocation += gotplt->output_offset;
2317 }
2318
2319 goto do_relocation;
2320 }
2321
2322 if (h->plt.offset == (bfd_vma) -1)
2323 {
2324 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2325 if (r_type == R_386_32
2326 && (input_section->flags & SEC_CODE) == 0)
2327 goto do_ifunc_pointer;
2328 goto bad_ifunc_reloc;
2329 }
2330
2331 relocation = (resolved_plt->output_section->vma
2332 + resolved_plt->output_offset + plt_offset);
2333
2334 switch (r_type)
2335 {
2336 default:
2337 bad_ifunc_reloc:
2338 if (h->root.root.string)
2339 name = h->root.root.string;
2340 else
2341 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2342 NULL);
2343 _bfd_error_handler
2344 /* xgettext:c-format */
2345 (_("%B: relocation %s against STT_GNU_IFUNC "
2346 "symbol `%s' isn't supported"), input_bfd,
2347 howto->name, name);
2348 bfd_set_error (bfd_error_bad_value);
2349 return FALSE;
2350
2351 case R_386_32:
2352 /* Generate dynamic relcoation only when there is a
2353 non-GOT reference in a shared object. */
2354 if ((bfd_link_pic (info) && h->non_got_ref)
2355 || h->plt.offset == (bfd_vma) -1)
2356 {
2357 Elf_Internal_Rela outrel;
2358 asection *sreloc;
2359 bfd_vma offset;
2360
2361 do_ifunc_pointer:
2362 /* Need a dynamic relocation to get the real function
2363 adddress. */
2364 offset = _bfd_elf_section_offset (output_bfd,
2365 info,
2366 input_section,
2367 rel->r_offset);
2368 if (offset == (bfd_vma) -1
2369 || offset == (bfd_vma) -2)
2370 abort ();
2371
2372 outrel.r_offset = (input_section->output_section->vma
2373 + input_section->output_offset
2374 + offset);
2375
2376 if (POINTER_LOCAL_IFUNC_P (info, h))
2377 {
2378 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2379 h->root.root.string,
2380 h->root.u.def.section->owner);
2381
2382 /* This symbol is resolved locally. */
2383 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2384 bfd_put_32 (output_bfd,
2385 (h->root.u.def.value
2386 + h->root.u.def.section->output_section->vma
2387 + h->root.u.def.section->output_offset),
2388 contents + offset);
2389 }
2390 else
2391 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2392
2393 /* Dynamic relocations are stored in
2394 1. .rel.ifunc section in PIC object.
2395 2. .rel.got section in dynamic executable.
2396 3. .rel.iplt section in static executable. */
2397 if (bfd_link_pic (info))
2398 sreloc = htab->elf.irelifunc;
2399 else if (htab->elf.splt != NULL)
2400 sreloc = htab->elf.srelgot;
2401 else
2402 sreloc = htab->elf.irelplt;
2403 elf_append_rel (output_bfd, sreloc, &outrel);
2404
2405 /* If this reloc is against an external symbol, we
2406 do not want to fiddle with the addend. Otherwise,
2407 we need to include the symbol value so that it
2408 becomes an addend for the dynamic reloc. For an
2409 internal symbol, we have updated addend. */
2410 continue;
2411 }
2412 /* FALLTHROUGH */
2413 case R_386_PC32:
2414 case R_386_PLT32:
2415 goto do_relocation;
2416
2417 case R_386_GOTOFF:
2418 relocation -= (gotplt->output_section->vma
2419 + gotplt->output_offset);
2420 goto do_relocation;
2421 }
2422 }
2423
2424 resolved_to_zero = (eh != NULL
2425 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2426
2427 switch (r_type)
2428 {
2429 case R_386_GOT32X:
2430 /* Avoid optimizing _DYNAMIC since ld.so may use its
2431 link-time address. */
2432 if (h == htab->elf.hdynamic)
2433 goto r_386_got32;
2434
2435 if (bfd_link_pic (info))
2436 {
2437 /* It is OK to convert mov to lea and convert indirect
2438 branch to direct branch. It is OK to convert adc,
2439 add, and, cmp, or, sbb, sub, test, xor only when PIC
2440 is false. */
2441 unsigned int opcode, addend;
2442 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2443 if (addend != 0)
2444 goto r_386_got32;
2445 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2446 if (opcode != 0x8b && opcode != 0xff)
2447 goto r_386_got32;
2448 }
2449
2450 /* Resolve "mov GOT[(%reg)], %reg",
2451 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2452 and "binop foo@GOT[(%reg)], %reg". */
2453 if (h == NULL
2454 || (h->plt.offset == (bfd_vma) -1
2455 && h->got.offset == (bfd_vma) -1)
2456 || htab->elf.sgotplt == NULL)
2457 abort ();
2458
2459 offplt = (htab->elf.sgotplt->output_section->vma
2460 + htab->elf.sgotplt->output_offset);
2461
2462 /* It is relative to .got.plt section. */
2463 if (h->got.offset != (bfd_vma) -1)
2464 /* Use GOT entry. Mask off the least significant bit in
2465 GOT offset which may be set by R_386_GOT32 processing
2466 below. */
2467 relocation = (htab->elf.sgot->output_section->vma
2468 + htab->elf.sgot->output_offset
2469 + (h->got.offset & ~1) - offplt);
2470 else
2471 /* Use GOTPLT entry. */
2472 relocation = (h->plt.offset / plt_entry_size
2473 - htab->plt.has_plt0 + 3) * 4;
2474
2475 if (!bfd_link_pic (info))
2476 {
2477 /* If not PIC, add the .got.plt section address for
2478 baseless addressing. */
2479 unsigned int modrm;
2480 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2481 if ((modrm & 0xc7) == 0x5)
2482 relocation += offplt;
2483 }
2484
2485 unresolved_reloc = FALSE;
2486 break;
2487
2488 case R_386_GOT32:
2489 r_386_got32:
2490 /* Relocation is to the entry for this symbol in the global
2491 offset table. */
2492 if (htab->elf.sgot == NULL)
2493 abort ();
2494
2495 relative_reloc = FALSE;
2496 if (h != NULL)
2497 {
2498 off = h->got.offset;
2499 if (RESOLVED_LOCALLY_P (info, h, htab))
2500 {
2501 /* We must initialize this entry in the global offset
2502 table. Since the offset must always be a multiple
2503 of 4, we use the least significant bit to record
2504 whether we have initialized it already.
2505
2506 When doing a dynamic link, we create a .rel.got
2507 relocation entry to initialize the value. This
2508 is done in the finish_dynamic_symbol routine. */
2509 if ((off & 1) != 0)
2510 off &= ~1;
2511 else
2512 {
2513 bfd_put_32 (output_bfd, relocation,
2514 htab->elf.sgot->contents + off);
2515 h->got.offset |= 1;
2516
2517 if (GENERATE_RELATIVE_RELOC_P (info, h))
2518 {
2519 /* PR ld/21402: If this symbol isn't dynamic
2520 in PIC, generate R_386_RELATIVE here. */
2521 eh->no_finish_dynamic_symbol = 1;
2522 relative_reloc = TRUE;
2523 }
2524 }
2525 }
2526 else
2527 unresolved_reloc = FALSE;
2528 }
2529 else
2530 {
2531 if (local_got_offsets == NULL)
2532 abort ();
2533
2534 off = local_got_offsets[r_symndx];
2535
2536 /* The offset must always be a multiple of 4. We use
2537 the least significant bit to record whether we have
2538 already generated the necessary reloc. */
2539 if ((off & 1) != 0)
2540 off &= ~1;
2541 else
2542 {
2543 bfd_put_32 (output_bfd, relocation,
2544 htab->elf.sgot->contents + off);
2545 local_got_offsets[r_symndx] |= 1;
2546
2547 if (bfd_link_pic (info))
2548 relative_reloc = TRUE;
2549 }
2550 }
2551
2552 if (relative_reloc)
2553 {
2554 asection *s;
2555 Elf_Internal_Rela outrel;
2556
2557 s = htab->elf.srelgot;
2558 if (s == NULL)
2559 abort ();
2560
2561 outrel.r_offset = (htab->elf.sgot->output_section->vma
2562 + htab->elf.sgot->output_offset
2563 + off);
2564 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2565 elf_append_rel (output_bfd, s, &outrel);
2566 }
2567
2568 if (off >= (bfd_vma) -2)
2569 abort ();
2570
2571 relocation = (htab->elf.sgot->output_section->vma
2572 + htab->elf.sgot->output_offset + off);
2573 if (rel->r_offset > 1
2574 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2575 && *(contents + rel->r_offset - 2) != 0x8d)
2576 {
2577 if (bfd_link_pic (info))
2578 {
2579 /* For PIC, disallow R_386_GOT32 without a base
2580 register, except for "lea foo@GOT, %reg", since
2581 we don't know what the GOT base is. */
2582 const char *name;
2583
2584 disallow_got32:
2585 if (h == NULL || h->root.root.string == NULL)
2586 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2587 NULL);
2588 else
2589 name = h->root.root.string;
2590
2591 _bfd_error_handler
2592 /* xgettext:c-format */
2593 (_("%B: direct GOT relocation %s against `%s'"
2594 " without base register can not be used"
2595 " when making a shared object"),
2596 input_bfd, howto->name, name);
2597 bfd_set_error (bfd_error_bad_value);
2598 return FALSE;
2599 }
2600 }
2601 else
2602 {
2603 /* Subtract the .got.plt section address only with a base
2604 register. */
2605 relocation -= (htab->elf.sgotplt->output_section->vma
2606 + htab->elf.sgotplt->output_offset);
2607 }
2608
2609 break;
2610
2611 case R_386_GOTOFF:
2612 /* Relocation is relative to the start of the global offset
2613 table. */
2614
2615 /* Check to make sure it isn't a protected function or data
2616 symbol for shared library since it may not be local when
2617 used as function address or with copy relocation. We also
2618 need to make sure that a symbol is referenced locally. */
2619 if (!bfd_link_executable (info) && h)
2620 {
2621 if (!h->def_regular)
2622 {
2623 const char *v;
2624
2625 switch (ELF_ST_VISIBILITY (h->other))
2626 {
2627 case STV_HIDDEN:
2628 v = _("hidden symbol");
2629 break;
2630 case STV_INTERNAL:
2631 v = _("internal symbol");
2632 break;
2633 case STV_PROTECTED:
2634 v = _("protected symbol");
2635 break;
2636 default:
2637 v = _("symbol");
2638 break;
2639 }
2640
2641 _bfd_error_handler
2642 /* xgettext:c-format */
2643 (_("%B: relocation R_386_GOTOFF against undefined %s"
2644 " `%s' can not be used when making a shared object"),
2645 input_bfd, v, h->root.root.string);
2646 bfd_set_error (bfd_error_bad_value);
2647 return FALSE;
2648 }
2649 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2650 && (h->type == STT_FUNC
2651 || h->type == STT_OBJECT)
2652 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2653 {
2654 _bfd_error_handler
2655 /* xgettext:c-format */
2656 (_("%B: relocation R_386_GOTOFF against protected %s"
2657 " `%s' can not be used when making a shared object"),
2658 input_bfd,
2659 h->type == STT_FUNC ? "function" : "data",
2660 h->root.root.string);
2661 bfd_set_error (bfd_error_bad_value);
2662 return FALSE;
2663 }
2664 }
2665
2666 /* Note that sgot is not involved in this
2667 calculation. We always want the start of .got.plt. If we
2668 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2669 permitted by the ABI, we might have to change this
2670 calculation. */
2671 relocation -= htab->elf.sgotplt->output_section->vma
2672 + htab->elf.sgotplt->output_offset;
2673 break;
2674
2675 case R_386_GOTPC:
2676 /* Use global offset table as symbol value. */
2677 relocation = htab->elf.sgotplt->output_section->vma
2678 + htab->elf.sgotplt->output_offset;
2679 unresolved_reloc = FALSE;
2680 break;
2681
2682 case R_386_PLT32:
2683 /* Relocation is to the entry for this symbol in the
2684 procedure linkage table. */
2685
2686 /* Resolve a PLT32 reloc against a local symbol directly,
2687 without using the procedure linkage table. */
2688 if (h == NULL)
2689 break;
2690
2691 if ((h->plt.offset == (bfd_vma) -1
2692 && eh->plt_got.offset == (bfd_vma) -1)
2693 || htab->elf.splt == NULL)
2694 {
2695 /* We didn't make a PLT entry for this symbol. This
2696 happens when statically linking PIC code, or when
2697 using -Bsymbolic. */
2698 break;
2699 }
2700
2701 if (h->plt.offset != (bfd_vma) -1)
2702 {
2703 if (htab->plt_second != NULL)
2704 {
2705 resolved_plt = htab->plt_second;
2706 plt_offset = eh->plt_second.offset;
2707 }
2708 else
2709 {
2710 resolved_plt = htab->elf.splt;
2711 plt_offset = h->plt.offset;
2712 }
2713 }
2714 else
2715 {
2716 resolved_plt = htab->plt_got;
2717 plt_offset = eh->plt_got.offset;
2718 }
2719
2720 relocation = (resolved_plt->output_section->vma
2721 + resolved_plt->output_offset
2722 + plt_offset);
2723 unresolved_reloc = FALSE;
2724 break;
2725
2726 case R_386_SIZE32:
2727 /* Set to symbol size. */
2728 relocation = st_size;
2729 /* Fall through. */
2730
2731 case R_386_32:
2732 case R_386_PC32:
2733 if ((input_section->flags & SEC_ALLOC) == 0
2734 || is_vxworks_tls)
2735 break;
2736
2737 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2738 FALSE, resolved_to_zero,
2739 (r_type == R_386_PC32)))
2740 {
2741 Elf_Internal_Rela outrel;
2742 bfd_boolean skip, relocate;
2743 asection *sreloc;
2744
2745 /* When generating a shared object, these relocations
2746 are copied into the output file to be resolved at run
2747 time. */
2748
2749 skip = FALSE;
2750 relocate = FALSE;
2751
2752 outrel.r_offset =
2753 _bfd_elf_section_offset (output_bfd, info, input_section,
2754 rel->r_offset);
2755 if (outrel.r_offset == (bfd_vma) -1)
2756 skip = TRUE;
2757 else if (outrel.r_offset == (bfd_vma) -2)
2758 skip = TRUE, relocate = TRUE;
2759 outrel.r_offset += (input_section->output_section->vma
2760 + input_section->output_offset);
2761
2762 if (skip)
2763 memset (&outrel, 0, sizeof outrel);
2764 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2765 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2766 else
2767 {
2768 /* This symbol is local, or marked to become local. */
2769 relocate = TRUE;
2770 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2771 }
2772
2773 sreloc = elf_section_data (input_section)->sreloc;
2774
2775 if (sreloc == NULL || sreloc->contents == NULL)
2776 {
2777 r = bfd_reloc_notsupported;
2778 goto check_relocation_error;
2779 }
2780
2781 elf_append_rel (output_bfd, sreloc, &outrel);
2782
2783 /* If this reloc is against an external symbol, we do
2784 not want to fiddle with the addend. Otherwise, we
2785 need to include the symbol value so that it becomes
2786 an addend for the dynamic reloc. */
2787 if (! relocate)
2788 continue;
2789 }
2790 break;
2791
2792 case R_386_TLS_IE:
2793 if (!bfd_link_executable (info))
2794 {
2795 Elf_Internal_Rela outrel;
2796 asection *sreloc;
2797
2798 outrel.r_offset = rel->r_offset
2799 + input_section->output_section->vma
2800 + input_section->output_offset;
2801 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2802 sreloc = elf_section_data (input_section)->sreloc;
2803 if (sreloc == NULL)
2804 abort ();
2805 elf_append_rel (output_bfd, sreloc, &outrel);
2806 }
2807 /* Fall through */
2808
2809 case R_386_TLS_GD:
2810 case R_386_TLS_GOTDESC:
2811 case R_386_TLS_DESC_CALL:
2812 case R_386_TLS_IE_32:
2813 case R_386_TLS_GOTIE:
2814 tls_type = GOT_UNKNOWN;
2815 if (h == NULL && local_got_offsets)
2816 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2817 else if (h != NULL)
2818 tls_type = elf_x86_hash_entry(h)->tls_type;
2819 if (tls_type == GOT_TLS_IE)
2820 tls_type = GOT_TLS_IE_NEG;
2821
2822 r_type_tls = r_type;
2823 if (! elf_i386_tls_transition (info, input_bfd,
2824 input_section, contents,
2825 symtab_hdr, sym_hashes,
2826 &r_type_tls, tls_type, rel,
2827 relend, h, r_symndx, TRUE))
2828 return FALSE;
2829
2830 if (r_type_tls == R_386_TLS_LE_32)
2831 {
2832 BFD_ASSERT (! unresolved_reloc);
2833 if (r_type == R_386_TLS_GD)
2834 {
2835 unsigned int type;
2836 bfd_vma roff;
2837
2838 /* GD->LE transition. */
2839 type = *(contents + rel->r_offset - 2);
2840 if (type == 0x04)
2841 {
2842 /* Change
2843 leal foo@tlsgd(,%ebx,1), %eax
2844 call ___tls_get_addr@PLT
2845 into:
2846 movl %gs:0, %eax
2847 subl $foo@tpoff, %eax
2848 (6 byte form of subl). */
2849 roff = rel->r_offset + 5;
2850 }
2851 else
2852 {
2853 /* Change
2854 leal foo@tlsgd(%ebx), %eax
2855 call ___tls_get_addr@PLT
2856 nop
2857 or
2858 leal foo@tlsgd(%reg), %eax
2859 call *___tls_get_addr@GOT(%reg)
2860 which may be converted to
2861 addr32 call ___tls_get_addr
2862 into:
2863 movl %gs:0, %eax; subl $foo@tpoff, %eax
2864 (6 byte form of subl). */
2865 roff = rel->r_offset + 6;
2866 }
2867 memcpy (contents + roff - 8,
2868 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2869 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2870 contents + roff);
2871 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2872 rel++;
2873 wrel++;
2874 continue;
2875 }
2876 else if (r_type == R_386_TLS_GOTDESC)
2877 {
2878 /* GDesc -> LE transition.
2879 It's originally something like:
2880 leal x@tlsdesc(%ebx), %eax
2881
2882 leal x@ntpoff, %eax
2883
2884 Registers other than %eax may be set up here. */
2885
2886 unsigned int val;
2887 bfd_vma roff;
2888
2889 roff = rel->r_offset;
2890 val = bfd_get_8 (input_bfd, contents + roff - 1);
2891
2892 /* Now modify the instruction as appropriate. */
2893 /* aoliva FIXME: remove the above and xor the byte
2894 below with 0x86. */
2895 bfd_put_8 (output_bfd, val ^ 0x86,
2896 contents + roff - 1);
2897 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2898 contents + roff);
2899 continue;
2900 }
2901 else if (r_type == R_386_TLS_DESC_CALL)
2902 {
2903 /* GDesc -> LE transition.
2904 It's originally:
2905 call *(%eax)
2906 Turn it into:
2907 xchg %ax,%ax */
2908
2909 bfd_vma roff;
2910
2911 roff = rel->r_offset;
2912 bfd_put_8 (output_bfd, 0x66, contents + roff);
2913 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2914 continue;
2915 }
2916 else if (r_type == R_386_TLS_IE)
2917 {
2918 unsigned int val;
2919
2920 /* IE->LE transition:
2921 Originally it can be one of:
2922 movl foo, %eax
2923 movl foo, %reg
2924 addl foo, %reg
2925 We change it into:
2926 movl $foo, %eax
2927 movl $foo, %reg
2928 addl $foo, %reg. */
2929 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2930 if (val == 0xa1)
2931 {
2932 /* movl foo, %eax. */
2933 bfd_put_8 (output_bfd, 0xb8,
2934 contents + rel->r_offset - 1);
2935 }
2936 else
2937 {
2938 unsigned int type;
2939
2940 type = bfd_get_8 (input_bfd,
2941 contents + rel->r_offset - 2);
2942 switch (type)
2943 {
2944 case 0x8b:
2945 /* movl */
2946 bfd_put_8 (output_bfd, 0xc7,
2947 contents + rel->r_offset - 2);
2948 bfd_put_8 (output_bfd,
2949 0xc0 | ((val >> 3) & 7),
2950 contents + rel->r_offset - 1);
2951 break;
2952 case 0x03:
2953 /* addl */
2954 bfd_put_8 (output_bfd, 0x81,
2955 contents + rel->r_offset - 2);
2956 bfd_put_8 (output_bfd,
2957 0xc0 | ((val >> 3) & 7),
2958 contents + rel->r_offset - 1);
2959 break;
2960 default:
2961 BFD_FAIL ();
2962 break;
2963 }
2964 }
2965 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2966 contents + rel->r_offset);
2967 continue;
2968 }
2969 else
2970 {
2971 unsigned int val, type;
2972
2973 /* {IE_32,GOTIE}->LE transition:
2974 Originally it can be one of:
2975 subl foo(%reg1), %reg2
2976 movl foo(%reg1), %reg2
2977 addl foo(%reg1), %reg2
2978 We change it into:
2979 subl $foo, %reg2
2980 movl $foo, %reg2 (6 byte form)
2981 addl $foo, %reg2. */
2982 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2983 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2984 if (type == 0x8b)
2985 {
2986 /* movl */
2987 bfd_put_8 (output_bfd, 0xc7,
2988 contents + rel->r_offset - 2);
2989 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2990 contents + rel->r_offset - 1);
2991 }
2992 else if (type == 0x2b)
2993 {
2994 /* subl */
2995 bfd_put_8 (output_bfd, 0x81,
2996 contents + rel->r_offset - 2);
2997 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2998 contents + rel->r_offset - 1);
2999 }
3000 else if (type == 0x03)
3001 {
3002 /* addl */
3003 bfd_put_8 (output_bfd, 0x81,
3004 contents + rel->r_offset - 2);
3005 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3006 contents + rel->r_offset - 1);
3007 }
3008 else
3009 BFD_FAIL ();
3010 if (r_type == R_386_TLS_GOTIE)
3011 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3012 contents + rel->r_offset);
3013 else
3014 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3015 contents + rel->r_offset);
3016 continue;
3017 }
3018 }
3019
3020 if (htab->elf.sgot == NULL)
3021 abort ();
3022
3023 if (h != NULL)
3024 {
3025 off = h->got.offset;
3026 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3027 }
3028 else
3029 {
3030 if (local_got_offsets == NULL)
3031 abort ();
3032
3033 off = local_got_offsets[r_symndx];
3034 offplt = local_tlsdesc_gotents[r_symndx];
3035 }
3036
3037 if ((off & 1) != 0)
3038 off &= ~1;
3039 else
3040 {
3041 Elf_Internal_Rela outrel;
3042 int dr_type;
3043 asection *sreloc;
3044
3045 if (htab->elf.srelgot == NULL)
3046 abort ();
3047
3048 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3049
3050 if (GOT_TLS_GDESC_P (tls_type))
3051 {
3052 bfd_byte *loc;
3053 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3054 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3055 <= htab->elf.sgotplt->size);
3056 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3057 + htab->elf.sgotplt->output_offset
3058 + offplt
3059 + htab->sgotplt_jump_table_size);
3060 sreloc = htab->elf.srelplt;
3061 loc = sreloc->contents;
3062 loc += (htab->next_tls_desc_index++
3063 * sizeof (Elf32_External_Rel));
3064 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3065 <= sreloc->contents + sreloc->size);
3066 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3067 if (indx == 0)
3068 {
3069 BFD_ASSERT (! unresolved_reloc);
3070 bfd_put_32 (output_bfd,
3071 relocation - _bfd_x86_elf_dtpoff_base (info),
3072 htab->elf.sgotplt->contents + offplt
3073 + htab->sgotplt_jump_table_size + 4);
3074 }
3075 else
3076 {
3077 bfd_put_32 (output_bfd, 0,
3078 htab->elf.sgotplt->contents + offplt
3079 + htab->sgotplt_jump_table_size + 4);
3080 }
3081 }
3082
3083 sreloc = htab->elf.srelgot;
3084
3085 outrel.r_offset = (htab->elf.sgot->output_section->vma
3086 + htab->elf.sgot->output_offset + off);
3087
3088 if (GOT_TLS_GD_P (tls_type))
3089 dr_type = R_386_TLS_DTPMOD32;
3090 else if (GOT_TLS_GDESC_P (tls_type))
3091 goto dr_done;
3092 else if (tls_type == GOT_TLS_IE_POS)
3093 dr_type = R_386_TLS_TPOFF;
3094 else
3095 dr_type = R_386_TLS_TPOFF32;
3096
3097 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3098 bfd_put_32 (output_bfd,
3099 relocation - _bfd_x86_elf_dtpoff_base (info),
3100 htab->elf.sgot->contents + off);
3101 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3102 bfd_put_32 (output_bfd,
3103 _bfd_x86_elf_dtpoff_base (info) - relocation,
3104 htab->elf.sgot->contents + off);
3105 else if (dr_type != R_386_TLS_DESC)
3106 bfd_put_32 (output_bfd, 0,
3107 htab->elf.sgot->contents + off);
3108 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3109
3110 elf_append_rel (output_bfd, sreloc, &outrel);
3111
3112 if (GOT_TLS_GD_P (tls_type))
3113 {
3114 if (indx == 0)
3115 {
3116 BFD_ASSERT (! unresolved_reloc);
3117 bfd_put_32 (output_bfd,
3118 relocation - _bfd_x86_elf_dtpoff_base (info),
3119 htab->elf.sgot->contents + off + 4);
3120 }
3121 else
3122 {
3123 bfd_put_32 (output_bfd, 0,
3124 htab->elf.sgot->contents + off + 4);
3125 outrel.r_info = ELF32_R_INFO (indx,
3126 R_386_TLS_DTPOFF32);
3127 outrel.r_offset += 4;
3128 elf_append_rel (output_bfd, sreloc, &outrel);
3129 }
3130 }
3131 else if (tls_type == GOT_TLS_IE_BOTH)
3132 {
3133 bfd_put_32 (output_bfd,
3134 (indx == 0
3135 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3136 : 0),
3137 htab->elf.sgot->contents + off + 4);
3138 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3139 outrel.r_offset += 4;
3140 elf_append_rel (output_bfd, sreloc, &outrel);
3141 }
3142
3143 dr_done:
3144 if (h != NULL)
3145 h->got.offset |= 1;
3146 else
3147 local_got_offsets[r_symndx] |= 1;
3148 }
3149
3150 if (off >= (bfd_vma) -2
3151 && ! GOT_TLS_GDESC_P (tls_type))
3152 abort ();
3153 if (r_type_tls == R_386_TLS_GOTDESC
3154 || r_type_tls == R_386_TLS_DESC_CALL)
3155 {
3156 relocation = htab->sgotplt_jump_table_size + offplt;
3157 unresolved_reloc = FALSE;
3158 }
3159 else if (r_type_tls == r_type)
3160 {
3161 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3162 + htab->elf.sgotplt->output_offset;
3163 relocation = htab->elf.sgot->output_section->vma
3164 + htab->elf.sgot->output_offset + off - g_o_t;
3165 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3166 && tls_type == GOT_TLS_IE_BOTH)
3167 relocation += 4;
3168 if (r_type == R_386_TLS_IE)
3169 relocation += g_o_t;
3170 unresolved_reloc = FALSE;
3171 }
3172 else if (r_type == R_386_TLS_GD)
3173 {
3174 unsigned int val, type;
3175 bfd_vma roff;
3176
3177 /* GD->IE transition. */
3178 type = *(contents + rel->r_offset - 2);
3179 val = *(contents + rel->r_offset - 1);
3180 if (type == 0x04)
3181 {
3182 /* Change
3183 leal foo@tlsgd(,%ebx,1), %eax
3184 call ___tls_get_addr@PLT
3185 into:
3186 movl %gs:0, %eax
3187 subl $foo@gottpoff(%ebx), %eax. */
3188 val >>= 3;
3189 roff = rel->r_offset - 3;
3190 }
3191 else
3192 {
3193 /* Change
3194 leal foo@tlsgd(%ebx), %eax
3195 call ___tls_get_addr@PLT
3196 nop
3197 or
3198 leal foo@tlsgd(%reg), %eax
3199 call *___tls_get_addr@GOT(%reg)
3200 which may be converted to
3201 addr32 call ___tls_get_addr
3202 into:
3203 movl %gs:0, %eax;
3204 subl $foo@gottpoff(%reg), %eax. */
3205 roff = rel->r_offset - 2;
3206 }
3207 memcpy (contents + roff,
3208 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3209 contents[roff + 7] = 0x80 | (val & 7);
3210 /* If foo is used only with foo@gotntpoff(%reg) and
3211 foo@indntpoff, but not with foo@gottpoff(%reg), change
3212 subl $foo@gottpoff(%reg), %eax
3213 into:
3214 addl $foo@gotntpoff(%reg), %eax. */
3215 if (tls_type == GOT_TLS_IE_POS)
3216 contents[roff + 6] = 0x03;
3217 bfd_put_32 (output_bfd,
3218 htab->elf.sgot->output_section->vma
3219 + htab->elf.sgot->output_offset + off
3220 - htab->elf.sgotplt->output_section->vma
3221 - htab->elf.sgotplt->output_offset,
3222 contents + roff + 8);
3223 /* Skip R_386_PLT32 and R_386_GOT32X. */
3224 rel++;
3225 wrel++;
3226 continue;
3227 }
3228 else if (r_type == R_386_TLS_GOTDESC)
3229 {
3230 /* GDesc -> IE transition.
3231 It's originally something like:
3232 leal x@tlsdesc(%ebx), %eax
3233
3234 Change it to:
3235 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3236 or:
3237 movl x@gottpoff(%ebx), %eax # before negl %eax
3238
3239 Registers other than %eax may be set up here. */
3240
3241 bfd_vma roff;
3242
3243 /* First, make sure it's a leal adding ebx to a 32-bit
3244 offset into any register, although it's probably
3245 almost always going to be eax. */
3246 roff = rel->r_offset;
3247
3248 /* Now modify the instruction as appropriate. */
3249 /* To turn a leal into a movl in the form we use it, it
3250 suffices to change the first byte from 0x8d to 0x8b.
3251 aoliva FIXME: should we decide to keep the leal, all
3252 we have to do is remove the statement below, and
3253 adjust the relaxation of R_386_TLS_DESC_CALL. */
3254 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3255
3256 if (tls_type == GOT_TLS_IE_BOTH)
3257 off += 4;
3258
3259 bfd_put_32 (output_bfd,
3260 htab->elf.sgot->output_section->vma
3261 + htab->elf.sgot->output_offset + off
3262 - htab->elf.sgotplt->output_section->vma
3263 - htab->elf.sgotplt->output_offset,
3264 contents + roff);
3265 continue;
3266 }
3267 else if (r_type == R_386_TLS_DESC_CALL)
3268 {
3269 /* GDesc -> IE transition.
3270 It's originally:
3271 call *(%eax)
3272
3273 Change it to:
3274 xchg %ax,%ax
3275 or
3276 negl %eax
3277 depending on how we transformed the TLS_GOTDESC above.
3278 */
3279
3280 bfd_vma roff;
3281
3282 roff = rel->r_offset;
3283
3284 /* Now modify the instruction as appropriate. */
3285 if (tls_type != GOT_TLS_IE_NEG)
3286 {
3287 /* xchg %ax,%ax */
3288 bfd_put_8 (output_bfd, 0x66, contents + roff);
3289 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3290 }
3291 else
3292 {
3293 /* negl %eax */
3294 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3295 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3296 }
3297
3298 continue;
3299 }
3300 else
3301 BFD_ASSERT (FALSE);
3302 break;
3303
3304 case R_386_TLS_LDM:
3305 if (! elf_i386_tls_transition (info, input_bfd,
3306 input_section, contents,
3307 symtab_hdr, sym_hashes,
3308 &r_type, GOT_UNKNOWN, rel,
3309 relend, h, r_symndx, TRUE))
3310 return FALSE;
3311
3312 if (r_type != R_386_TLS_LDM)
3313 {
3314 /* LD->LE transition. Change
3315 leal foo@tlsldm(%ebx) %eax
3316 call ___tls_get_addr@PLT
3317 into:
3318 movl %gs:0, %eax
3319 nop
3320 leal 0(%esi,1), %esi
3321 or change
3322 leal foo@tlsldm(%reg) %eax
3323 call *___tls_get_addr@GOT(%reg)
3324 which may be converted to
3325 addr32 call ___tls_get_addr
3326 into:
3327 movl %gs:0, %eax
3328 leal 0(%esi), %esi */
3329 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3330 if (*(contents + rel->r_offset + 4) == 0xff
3331 || *(contents + rel->r_offset + 4) == 0x67)
3332 memcpy (contents + rel->r_offset - 2,
3333 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3334 else
3335 memcpy (contents + rel->r_offset - 2,
3336 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3337 /* Skip R_386_PC32/R_386_PLT32. */
3338 rel++;
3339 wrel++;
3340 continue;
3341 }
3342
3343 if (htab->elf.sgot == NULL)
3344 abort ();
3345
3346 off = htab->tls_ld_or_ldm_got.offset;
3347 if (off & 1)
3348 off &= ~1;
3349 else
3350 {
3351 Elf_Internal_Rela outrel;
3352
3353 if (htab->elf.srelgot == NULL)
3354 abort ();
3355
3356 outrel.r_offset = (htab->elf.sgot->output_section->vma
3357 + htab->elf.sgot->output_offset + off);
3358
3359 bfd_put_32 (output_bfd, 0,
3360 htab->elf.sgot->contents + off);
3361 bfd_put_32 (output_bfd, 0,
3362 htab->elf.sgot->contents + off + 4);
3363 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3364 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3365 htab->tls_ld_or_ldm_got.offset |= 1;
3366 }
3367 relocation = htab->elf.sgot->output_section->vma
3368 + htab->elf.sgot->output_offset + off
3369 - htab->elf.sgotplt->output_section->vma
3370 - htab->elf.sgotplt->output_offset;
3371 unresolved_reloc = FALSE;
3372 break;
3373
3374 case R_386_TLS_LDO_32:
3375 if (!bfd_link_executable (info)
3376 || (input_section->flags & SEC_CODE) == 0)
3377 relocation -= _bfd_x86_elf_dtpoff_base (info);
3378 else
3379 /* When converting LDO to LE, we must negate. */
3380 relocation = -elf_i386_tpoff (info, relocation);
3381 break;
3382
3383 case R_386_TLS_LE_32:
3384 case R_386_TLS_LE:
3385 if (!bfd_link_executable (info))
3386 {
3387 Elf_Internal_Rela outrel;
3388 asection *sreloc;
3389
3390 outrel.r_offset = rel->r_offset
3391 + input_section->output_section->vma
3392 + input_section->output_offset;
3393 if (h != NULL && h->dynindx != -1)
3394 indx = h->dynindx;
3395 else
3396 indx = 0;
3397 if (r_type == R_386_TLS_LE_32)
3398 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3399 else
3400 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3401 sreloc = elf_section_data (input_section)->sreloc;
3402 if (sreloc == NULL)
3403 abort ();
3404 elf_append_rel (output_bfd, sreloc, &outrel);
3405 if (indx)
3406 continue;
3407 else if (r_type == R_386_TLS_LE_32)
3408 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3409 else
3410 relocation -= _bfd_x86_elf_dtpoff_base (info);
3411 }
3412 else if (r_type == R_386_TLS_LE_32)
3413 relocation = elf_i386_tpoff (info, relocation);
3414 else
3415 relocation = -elf_i386_tpoff (info, relocation);
3416 break;
3417
3418 default:
3419 break;
3420 }
3421
3422 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3423 because such sections are not SEC_ALLOC and thus ld.so will
3424 not process them. */
3425 if (unresolved_reloc
3426 && !((input_section->flags & SEC_DEBUGGING) != 0
3427 && h->def_dynamic)
3428 && _bfd_elf_section_offset (output_bfd, info, input_section,
3429 rel->r_offset) != (bfd_vma) -1)
3430 {
3431 _bfd_error_handler
3432 /* xgettext:c-format */
3433 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3434 input_bfd,
3435 input_section,
3436 rel->r_offset,
3437 howto->name,
3438 h->root.root.string);
3439 return FALSE;
3440 }
3441
3442 do_relocation:
3443 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3444 contents, rel->r_offset,
3445 relocation, 0);
3446
3447 check_relocation_error:
3448 if (r != bfd_reloc_ok)
3449 {
3450 const char *name;
3451
3452 if (h != NULL)
3453 name = h->root.root.string;
3454 else
3455 {
3456 name = bfd_elf_string_from_elf_section (input_bfd,
3457 symtab_hdr->sh_link,
3458 sym->st_name);
3459 if (name == NULL)
3460 return FALSE;
3461 if (*name == '\0')
3462 name = bfd_section_name (input_bfd, sec);
3463 }
3464
3465 if (r == bfd_reloc_overflow)
3466 (*info->callbacks->reloc_overflow)
3467 (info, (h ? &h->root : NULL), name, howto->name,
3468 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3469 else
3470 {
3471 _bfd_error_handler
3472 /* xgettext:c-format */
3473 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3474 input_bfd, input_section,
3475 rel->r_offset, name, (int) r);
3476 return FALSE;
3477 }
3478 }
3479
3480 if (wrel != rel)
3481 *wrel = *rel;
3482 }
3483
3484 if (wrel != rel)
3485 {
3486 Elf_Internal_Shdr *rel_hdr;
3487 size_t deleted = rel - wrel;
3488
3489 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3490 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3491 if (rel_hdr->sh_size == 0)
3492 {
3493 /* It is too late to remove an empty reloc section. Leave
3494 one NONE reloc.
3495 ??? What is wrong with an empty section??? */
3496 rel_hdr->sh_size = rel_hdr->sh_entsize;
3497 deleted -= 1;
3498 }
3499 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3500 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3501 input_section->reloc_count -= deleted;
3502 }
3503
3504 return TRUE;
3505 }
3506
3507 /* Finish up dynamic symbol handling. We set the contents of various
3508 dynamic sections here. */
3509
3510 static bfd_boolean
3511 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3512 struct bfd_link_info *info,
3513 struct elf_link_hash_entry *h,
3514 Elf_Internal_Sym *sym)
3515 {
3516 struct elf_x86_link_hash_table *htab;
3517 unsigned plt_entry_size;
3518 struct elf_x86_link_hash_entry *eh;
3519 bfd_boolean local_undefweak;
3520 bfd_boolean use_plt_second;
3521
3522 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3523 if (htab == NULL)
3524 return FALSE;
3525
3526 plt_entry_size = htab->plt.plt_entry_size;
3527
3528 /* Use the second PLT section only if there is .plt section. */
3529 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3530
3531 eh = (struct elf_x86_link_hash_entry *) h;
3532 if (eh->no_finish_dynamic_symbol)
3533 abort ();
3534
3535 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3536 resolved undefined weak symbols in executable so that their
3537 references have value 0 at run-time. */
3538 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3539
3540 if (h->plt.offset != (bfd_vma) -1)
3541 {
3542 bfd_vma plt_index, plt_offset;
3543 bfd_vma got_offset;
3544 Elf_Internal_Rela rel;
3545 bfd_byte *loc;
3546 asection *plt, *resolved_plt, *gotplt, *relplt;
3547
3548 /* When building a static executable, use .iplt, .igot.plt and
3549 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3550 if (htab->elf.splt != NULL)
3551 {
3552 plt = htab->elf.splt;
3553 gotplt = htab->elf.sgotplt;
3554 relplt = htab->elf.srelplt;
3555 }
3556 else
3557 {
3558 plt = htab->elf.iplt;
3559 gotplt = htab->elf.igotplt;
3560 relplt = htab->elf.irelplt;
3561 }
3562
3563 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3564
3565 /* Get the index in the procedure linkage table which
3566 corresponds to this symbol. This is the index of this symbol
3567 in all the symbols for which we are making plt entries. The
3568 first entry in the procedure linkage table is reserved.
3569
3570 Get the offset into the .got table of the entry that
3571 corresponds to this function. Each .got entry is 4 bytes.
3572 The first three are reserved.
3573
3574 For static executables, we don't reserve anything. */
3575
3576 if (plt == htab->elf.splt)
3577 {
3578 got_offset = (h->plt.offset / plt_entry_size
3579 - htab->plt.has_plt0);
3580 got_offset = (got_offset + 3) * 4;
3581 }
3582 else
3583 {
3584 got_offset = h->plt.offset / plt_entry_size;
3585 got_offset = got_offset * 4;
3586 }
3587
3588 /* Fill in the entry in the procedure linkage table and update
3589 the first slot. */
3590 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3591 plt_entry_size);
3592
3593 if (use_plt_second)
3594 {
3595 const bfd_byte *plt_entry;
3596 if (bfd_link_pic (info))
3597 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3598 else
3599 plt_entry = htab->non_lazy_plt->plt_entry;
3600 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3601 plt_entry, htab->non_lazy_plt->plt_entry_size);
3602
3603 resolved_plt = htab->plt_second;
3604 plt_offset = eh->plt_second.offset;
3605 }
3606 else
3607 {
3608 resolved_plt = plt;
3609 plt_offset = h->plt.offset;
3610 }
3611
3612 if (! bfd_link_pic (info))
3613 {
3614 bfd_put_32 (output_bfd,
3615 (gotplt->output_section->vma
3616 + gotplt->output_offset
3617 + got_offset),
3618 resolved_plt->contents + plt_offset
3619 + htab->plt.plt_got_offset);
3620
3621 if (htab->target_os == is_vxworks)
3622 {
3623 int s, k, reloc_index;
3624
3625 /* Create the R_386_32 relocation referencing the GOT
3626 for this PLT entry. */
3627
3628 /* S: Current slot number (zero-based). */
3629 s = ((h->plt.offset - htab->plt.plt_entry_size)
3630 / htab->plt.plt_entry_size);
3631 /* K: Number of relocations for PLTResolve. */
3632 if (bfd_link_pic (info))
3633 k = PLTRESOLVE_RELOCS_SHLIB;
3634 else
3635 k = PLTRESOLVE_RELOCS;
3636 /* Skip the PLTresolve relocations, and the relocations for
3637 the other PLT slots. */
3638 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3639 loc = (htab->srelplt2->contents + reloc_index
3640 * sizeof (Elf32_External_Rel));
3641
3642 rel.r_offset = (plt->output_section->vma
3643 + plt->output_offset
3644 + h->plt.offset + 2),
3645 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3646 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3647
3648 /* Create the R_386_32 relocation referencing the beginning of
3649 the PLT for this GOT entry. */
3650 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3651 + htab->elf.sgotplt->output_offset
3652 + got_offset);
3653 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3654 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3655 loc + sizeof (Elf32_External_Rel));
3656 }
3657 }
3658 else
3659 {
3660 bfd_put_32 (output_bfd, got_offset,
3661 resolved_plt->contents + plt_offset
3662 + htab->plt.plt_got_offset);
3663 }
3664
3665 /* Fill in the entry in the global offset table. Leave the entry
3666 as zero for undefined weak symbol in PIE. No PLT relocation
3667 against undefined weak symbol in PIE. */
3668 if (!local_undefweak)
3669 {
3670 if (htab->plt.has_plt0)
3671 bfd_put_32 (output_bfd,
3672 (plt->output_section->vma
3673 + plt->output_offset
3674 + h->plt.offset
3675 + htab->lazy_plt->plt_lazy_offset),
3676 gotplt->contents + got_offset);
3677
3678 /* Fill in the entry in the .rel.plt section. */
3679 rel.r_offset = (gotplt->output_section->vma
3680 + gotplt->output_offset
3681 + got_offset);
3682 if (PLT_LOCAL_IFUNC_P (info, h))
3683 {
3684 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3685 h->root.root.string,
3686 h->root.u.def.section->owner);
3687
3688 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3689 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3690 in the .got.plt section. */
3691 bfd_put_32 (output_bfd,
3692 (h->root.u.def.value
3693 + h->root.u.def.section->output_section->vma
3694 + h->root.u.def.section->output_offset),
3695 gotplt->contents + got_offset);
3696 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3697 /* R_386_IRELATIVE comes last. */
3698 plt_index = htab->next_irelative_index--;
3699 }
3700 else
3701 {
3702 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3703 plt_index = htab->next_jump_slot_index++;
3704 }
3705
3706 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3707 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3708
3709 /* Don't fill the second and third slots in PLT entry for
3710 static executables nor without PLT0. */
3711 if (plt == htab->elf.splt && htab->plt.has_plt0)
3712 {
3713 bfd_put_32 (output_bfd,
3714 plt_index * sizeof (Elf32_External_Rel),
3715 plt->contents + h->plt.offset
3716 + htab->lazy_plt->plt_reloc_offset);
3717 bfd_put_32 (output_bfd,
3718 - (h->plt.offset
3719 + htab->lazy_plt->plt_plt_offset + 4),
3720 (plt->contents + h->plt.offset
3721 + htab->lazy_plt->plt_plt_offset));
3722 }
3723 }
3724 }
3725 else if (eh->plt_got.offset != (bfd_vma) -1)
3726 {
3727 bfd_vma got_offset, plt_offset;
3728 asection *plt, *got, *gotplt;
3729 const bfd_byte *got_plt_entry;
3730
3731 /* Set the entry in the GOT procedure linkage table. */
3732 plt = htab->plt_got;
3733 got = htab->elf.sgot;
3734 gotplt = htab->elf.sgotplt;
3735 got_offset = h->got.offset;
3736
3737 if (got_offset == (bfd_vma) -1
3738 || plt == NULL
3739 || got == NULL
3740 || gotplt == NULL)
3741 abort ();
3742
3743 /* Fill in the entry in the GOT procedure linkage table. */
3744 if (! bfd_link_pic (info))
3745 {
3746 got_plt_entry = htab->non_lazy_plt->plt_entry;
3747 got_offset += got->output_section->vma + got->output_offset;
3748 }
3749 else
3750 {
3751 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3752 got_offset += (got->output_section->vma
3753 + got->output_offset
3754 - gotplt->output_section->vma
3755 - gotplt->output_offset);
3756 }
3757
3758 plt_offset = eh->plt_got.offset;
3759 memcpy (plt->contents + plt_offset, got_plt_entry,
3760 htab->non_lazy_plt->plt_entry_size);
3761 bfd_put_32 (output_bfd, got_offset,
3762 (plt->contents + plt_offset
3763 + htab->non_lazy_plt->plt_got_offset));
3764 }
3765
3766 if (!local_undefweak
3767 && !h->def_regular
3768 && (h->plt.offset != (bfd_vma) -1
3769 || eh->plt_got.offset != (bfd_vma) -1))
3770 {
3771 /* Mark the symbol as undefined, rather than as defined in
3772 the .plt section. Leave the value if there were any
3773 relocations where pointer equality matters (this is a clue
3774 for the dynamic linker, to make function pointer
3775 comparisons work between an application and shared
3776 library), otherwise set it to zero. If a function is only
3777 called from a binary, there is no need to slow down
3778 shared libraries because of that. */
3779 sym->st_shndx = SHN_UNDEF;
3780 if (!h->pointer_equality_needed)
3781 sym->st_value = 0;
3782 }
3783
3784 /* Don't generate dynamic GOT relocation against undefined weak
3785 symbol in executable. */
3786 if (h->got.offset != (bfd_vma) -1
3787 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3788 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3789 && !local_undefweak)
3790 {
3791 Elf_Internal_Rela rel;
3792 asection *relgot = htab->elf.srelgot;
3793
3794 /* This symbol has an entry in the global offset table. Set it
3795 up. */
3796
3797 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3798 abort ();
3799
3800 rel.r_offset = (htab->elf.sgot->output_section->vma
3801 + htab->elf.sgot->output_offset
3802 + (h->got.offset & ~(bfd_vma) 1));
3803
3804 /* If this is a static link, or it is a -Bsymbolic link and the
3805 symbol is defined locally or was forced to be local because
3806 of a version file, we just want to emit a RELATIVE reloc.
3807 The entry in the global offset table will already have been
3808 initialized in the relocate_section function. */
3809 if (h->def_regular
3810 && h->type == STT_GNU_IFUNC)
3811 {
3812 if (h->plt.offset == (bfd_vma) -1)
3813 {
3814 /* STT_GNU_IFUNC is referenced without PLT. */
3815 if (htab->elf.splt == NULL)
3816 {
3817 /* use .rel[a].iplt section to store .got relocations
3818 in static executable. */
3819 relgot = htab->elf.irelplt;
3820 }
3821 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3822 {
3823 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3824 h->root.root.string,
3825 h->root.u.def.section->owner);
3826
3827 bfd_put_32 (output_bfd,
3828 (h->root.u.def.value
3829 + h->root.u.def.section->output_section->vma
3830 + h->root.u.def.section->output_offset),
3831 htab->elf.sgot->contents + h->got.offset);
3832 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3833 }
3834 else
3835 goto do_glob_dat;
3836 }
3837 else if (bfd_link_pic (info))
3838 {
3839 /* Generate R_386_GLOB_DAT. */
3840 goto do_glob_dat;
3841 }
3842 else
3843 {
3844 asection *plt;
3845 bfd_vma plt_offset;
3846
3847 if (!h->pointer_equality_needed)
3848 abort ();
3849
3850 /* For non-shared object, we can't use .got.plt, which
3851 contains the real function addres if we need pointer
3852 equality. We load the GOT entry with the PLT entry. */
3853 if (htab->plt_second != NULL)
3854 {
3855 plt = htab->plt_second;
3856 plt_offset = eh->plt_second.offset;
3857 }
3858 else
3859 {
3860 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3861 plt_offset = h->plt.offset;
3862 }
3863 bfd_put_32 (output_bfd,
3864 (plt->output_section->vma
3865 + plt->output_offset + plt_offset),
3866 htab->elf.sgot->contents + h->got.offset);
3867 return TRUE;
3868 }
3869 }
3870 else if (bfd_link_pic (info)
3871 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3872 {
3873 BFD_ASSERT((h->got.offset & 1) != 0);
3874 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3875 }
3876 else
3877 {
3878 BFD_ASSERT((h->got.offset & 1) == 0);
3879 do_glob_dat:
3880 bfd_put_32 (output_bfd, (bfd_vma) 0,
3881 htab->elf.sgot->contents + h->got.offset);
3882 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3883 }
3884
3885 elf_append_rel (output_bfd, relgot, &rel);
3886 }
3887
3888 if (h->needs_copy)
3889 {
3890 Elf_Internal_Rela rel;
3891 asection *s;
3892
3893 /* This symbol needs a copy reloc. Set it up. */
3894 VERIFY_COPY_RELOC (h, htab)
3895
3896 rel.r_offset = (h->root.u.def.value
3897 + h->root.u.def.section->output_section->vma
3898 + h->root.u.def.section->output_offset);
3899 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3900 if (h->root.u.def.section == htab->elf.sdynrelro)
3901 s = htab->elf.sreldynrelro;
3902 else
3903 s = htab->elf.srelbss;
3904 elf_append_rel (output_bfd, s, &rel);
3905 }
3906
3907 return TRUE;
3908 }
3909
3910 /* Finish up local dynamic symbol handling. We set the contents of
3911 various dynamic sections here. */
3912
3913 static bfd_boolean
3914 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3915 {
3916 struct elf_link_hash_entry *h
3917 = (struct elf_link_hash_entry *) *slot;
3918 struct bfd_link_info *info
3919 = (struct bfd_link_info *) inf;
3920
3921 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3922 h, NULL);
3923 }
3924
3925 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3926 here since undefined weak symbol may not be dynamic and may not be
3927 called for elf_i386_finish_dynamic_symbol. */
3928
3929 static bfd_boolean
3930 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3931 void *inf)
3932 {
3933 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3934 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3935
3936 if (h->root.type != bfd_link_hash_undefweak
3937 || h->dynindx != -1)
3938 return TRUE;
3939
3940 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3941 info, h, NULL);
3942 }
3943
3944 /* Used to decide how to sort relocs in an optimal manner for the
3945 dynamic linker, before writing them out. */
3946
3947 static enum elf_reloc_type_class
3948 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3949 const asection *rel_sec ATTRIBUTE_UNUSED,
3950 const Elf_Internal_Rela *rela)
3951 {
3952 bfd *abfd = info->output_bfd;
3953 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3954 struct elf_link_hash_table *htab = elf_hash_table (info);
3955
3956 if (htab->dynsym != NULL
3957 && htab->dynsym->contents != NULL)
3958 {
3959 /* Check relocation against STT_GNU_IFUNC symbol if there are
3960 dynamic symbols. */
3961 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3962 if (r_symndx != STN_UNDEF)
3963 {
3964 Elf_Internal_Sym sym;
3965 if (!bed->s->swap_symbol_in (abfd,
3966 (htab->dynsym->contents
3967 + r_symndx * sizeof (Elf32_External_Sym)),
3968 0, &sym))
3969 abort ();
3970
3971 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3972 return reloc_class_ifunc;
3973 }
3974 }
3975
3976 switch (ELF32_R_TYPE (rela->r_info))
3977 {
3978 case R_386_IRELATIVE:
3979 return reloc_class_ifunc;
3980 case R_386_RELATIVE:
3981 return reloc_class_relative;
3982 case R_386_JUMP_SLOT:
3983 return reloc_class_plt;
3984 case R_386_COPY:
3985 return reloc_class_copy;
3986 default:
3987 return reloc_class_normal;
3988 }
3989 }
3990
3991 /* Finish up the dynamic sections. */
3992
3993 static bfd_boolean
3994 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3995 struct bfd_link_info *info)
3996 {
3997 struct elf_x86_link_hash_table *htab;
3998
3999 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4000 if (htab == NULL)
4001 return FALSE;
4002
4003 if (!htab->elf.dynamic_sections_created)
4004 return TRUE;
4005
4006 if (htab->elf.splt && htab->elf.splt->size > 0)
4007 {
4008 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4009 really seem like the right value. */
4010 elf_section_data (htab->elf.splt->output_section)
4011 ->this_hdr.sh_entsize = 4;
4012
4013 if (htab->plt.has_plt0)
4014 {
4015 /* Fill in the special first entry in the procedure linkage
4016 table. */
4017 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4018 htab->lazy_plt->plt0_entry_size);
4019 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4020 htab->plt0_pad_byte,
4021 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4022 if (!bfd_link_pic (info))
4023 {
4024 bfd_put_32 (output_bfd,
4025 (htab->elf.sgotplt->output_section->vma
4026 + htab->elf.sgotplt->output_offset
4027 + 4),
4028 htab->elf.splt->contents
4029 + htab->lazy_plt->plt0_got1_offset);
4030 bfd_put_32 (output_bfd,
4031 (htab->elf.sgotplt->output_section->vma
4032 + htab->elf.sgotplt->output_offset
4033 + 8),
4034 htab->elf.splt->contents
4035 + htab->lazy_plt->plt0_got2_offset);
4036
4037 if (htab->target_os == is_vxworks)
4038 {
4039 Elf_Internal_Rela rel;
4040 int num_plts = (htab->elf.splt->size
4041 / htab->plt.plt_entry_size) - 1;
4042 unsigned char *p;
4043 asection *srelplt2 = htab->srelplt2;
4044
4045 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4046 + 4. On IA32 we use REL relocations so the
4047 addend goes in the PLT directly. */
4048 rel.r_offset = (htab->elf.splt->output_section->vma
4049 + htab->elf.splt->output_offset
4050 + htab->lazy_plt->plt0_got1_offset);
4051 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4052 R_386_32);
4053 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4054 srelplt2->contents);
4055 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4056 + 8. */
4057 rel.r_offset = (htab->elf.splt->output_section->vma
4058 + htab->elf.splt->output_offset
4059 + htab->lazy_plt->plt0_got2_offset);
4060 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4061 R_386_32);
4062 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4063 srelplt2->contents +
4064 sizeof (Elf32_External_Rel));
4065 /* Correct the .rel.plt.unloaded relocations. */
4066 p = srelplt2->contents;
4067 if (bfd_link_pic (info))
4068 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4069 else
4070 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4071
4072 for (; num_plts; num_plts--)
4073 {
4074 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4075 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4076 R_386_32);
4077 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4078 p += sizeof (Elf32_External_Rel);
4079
4080 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4081 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4082 R_386_32);
4083 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4084 p += sizeof (Elf32_External_Rel);
4085 }
4086 }
4087 }
4088 }
4089 }
4090
4091 /* Fill PLT entries for undefined weak symbols in PIE. */
4092 if (bfd_link_pie (info))
4093 bfd_hash_traverse (&info->hash->table,
4094 elf_i386_pie_finish_undefweak_symbol,
4095 info);
4096
4097 return TRUE;
4098 }
4099
4100 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4101 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4102 It has to be done before elf_link_sort_relocs is called so that
4103 dynamic relocations are properly sorted. */
4104
4105 static bfd_boolean
4106 elf_i386_output_arch_local_syms
4107 (bfd *output_bfd ATTRIBUTE_UNUSED,
4108 struct bfd_link_info *info,
4109 void *flaginfo ATTRIBUTE_UNUSED,
4110 int (*func) (void *, const char *,
4111 Elf_Internal_Sym *,
4112 asection *,
4113 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4114 {
4115 struct elf_x86_link_hash_table *htab
4116 = elf_x86_hash_table (info, I386_ELF_DATA);
4117 if (htab == NULL)
4118 return FALSE;
4119
4120 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4121 htab_traverse (htab->loc_hash_table,
4122 elf_i386_finish_local_dynamic_symbol,
4123 info);
4124
4125 return TRUE;
4126 }
4127
4128 /* Forward declaration. */
4129 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4130
4131 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4132 dynamic relocations. */
4133
4134 static long
4135 elf_i386_get_synthetic_symtab (bfd *abfd,
4136 long symcount ATTRIBUTE_UNUSED,
4137 asymbol **syms ATTRIBUTE_UNUSED,
4138 long dynsymcount,
4139 asymbol **dynsyms,
4140 asymbol **ret)
4141 {
4142 long count, i, n;
4143 int j;
4144 bfd_byte *plt_contents;
4145 long relsize;
4146 const struct elf_x86_lazy_plt_layout *lazy_plt;
4147 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4148 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4149 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4150 asection *plt;
4151 bfd_vma got_addr;
4152 enum elf_x86_plt_type plt_type;
4153 struct elf_x86_plt plts[] =
4154 {
4155 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4156 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4157 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4158 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4159 };
4160
4161 *ret = NULL;
4162
4163 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4164 return 0;
4165
4166 if (dynsymcount <= 0)
4167 return 0;
4168
4169 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4170 if (relsize <= 0)
4171 return -1;
4172
4173 non_lazy_plt = NULL;
4174 /* Silence GCC 6. */
4175 lazy_plt = NULL;
4176 non_lazy_ibt_plt = NULL;
4177 lazy_ibt_plt = NULL;
4178 switch (get_elf_x86_backend_data (abfd)->target_os)
4179 {
4180 case is_normal:
4181 non_lazy_plt = &elf_i386_non_lazy_plt;
4182 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4183 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4184 /* Fall through */
4185 case is_vxworks:
4186 lazy_plt = &elf_i386_lazy_plt;
4187 break;
4188 case is_nacl:
4189 lazy_plt = &elf_i386_nacl_plt;
4190 break;
4191 }
4192
4193 got_addr = 0;
4194
4195 count = 0;
4196 for (j = 0; plts[j].name != NULL; j++)
4197 {
4198 plt = bfd_get_section_by_name (abfd, plts[j].name);
4199 if (plt == NULL || plt->size == 0)
4200 continue;
4201
4202 /* Get the PLT section contents. */
4203 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4204 if (plt_contents == NULL)
4205 break;
4206 if (!bfd_get_section_contents (abfd, (asection *) plt,
4207 plt_contents, 0, plt->size))
4208 {
4209 free (plt_contents);
4210 break;
4211 }
4212
4213 /* Check what kind of PLT it is. */
4214 plt_type = plt_unknown;
4215 if (plts[j].type == plt_unknown
4216 && (plt->size >= (lazy_plt->plt0_entry_size
4217 + lazy_plt->plt_entry_size)))
4218 {
4219 /* Match lazy PLT first. */
4220 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4221 lazy_plt->plt0_got1_offset) == 0)
4222 {
4223 /* The fist entry in the lazy IBT PLT is the same as the
4224 normal lazy PLT. */
4225 if (lazy_ibt_plt != NULL
4226 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4227 lazy_ibt_plt->plt_entry,
4228 lazy_ibt_plt->plt_got_offset) == 0))
4229 plt_type = plt_lazy | plt_second;
4230 else
4231 plt_type = plt_lazy;
4232 }
4233 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4234 lazy_plt->plt0_got1_offset) == 0)
4235 {
4236 /* The fist entry in the PIC lazy IBT PLT is the same as
4237 the normal PIC lazy PLT. */
4238 if (lazy_ibt_plt != NULL
4239 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4240 lazy_ibt_plt->pic_plt_entry,
4241 lazy_ibt_plt->plt_got_offset) == 0))
4242 plt_type = plt_lazy | plt_pic | plt_second;
4243 else
4244 plt_type = plt_lazy | plt_pic;
4245 }
4246 }
4247
4248 if (non_lazy_plt != NULL
4249 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4250 && plt->size >= non_lazy_plt->plt_entry_size)
4251 {
4252 /* Match non-lazy PLT. */
4253 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4254 non_lazy_plt->plt_got_offset) == 0)
4255 plt_type = plt_non_lazy;
4256 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4257 non_lazy_plt->plt_got_offset) == 0)
4258 plt_type = plt_pic;
4259 }
4260
4261 if ((non_lazy_ibt_plt != NULL)
4262 && (plt_type == plt_unknown || plt_type == plt_second)
4263 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4264 {
4265 if (memcmp (plt_contents,
4266 non_lazy_ibt_plt->plt_entry,
4267 non_lazy_ibt_plt->plt_got_offset) == 0)
4268 {
4269 /* Match IBT PLT. */
4270 plt_type = plt_second;
4271 non_lazy_plt = non_lazy_ibt_plt;
4272 }
4273 else if (memcmp (plt_contents,
4274 non_lazy_ibt_plt->pic_plt_entry,
4275 non_lazy_ibt_plt->plt_got_offset) == 0)
4276 {
4277 /* Match PIC IBT PLT. */
4278 plt_type = plt_second | plt_pic;
4279 non_lazy_plt = non_lazy_ibt_plt;
4280 }
4281 }
4282
4283 if (plt_type == plt_unknown)
4284 {
4285 free (plt_contents);
4286 continue;
4287 }
4288
4289 plts[j].sec = plt;
4290 plts[j].type = plt_type;
4291
4292 if ((plt_type & plt_lazy))
4293 {
4294 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4295 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4296 /* Skip PLT0 in lazy PLT. */
4297 i = 1;
4298 }
4299 else
4300 {
4301 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4302 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4303 i = 0;
4304 }
4305
4306 /* Skip lazy PLT when the second PLT is used. */
4307 if ((plt_type & (plt_lazy | plt_second))
4308 == (plt_lazy | plt_second))
4309 plts[j].count = 0;
4310 else
4311 {
4312 n = plt->size / plts[j].plt_entry_size;
4313 plts[j].count = n;
4314 count += n - i;
4315 }
4316
4317 plts[j].contents = plt_contents;
4318
4319 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4320 if ((plt_type & plt_pic))
4321 got_addr = (bfd_vma) -1;
4322 }
4323
4324 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4325 got_addr, plts, dynsyms,
4326 ret);
4327 }
4328
4329 /* Set up i386 GNU properties. Return the first relocatable ELF input
4330 with GNU properties if found. Otherwise, return NULL. */
4331
4332 static bfd *
4333 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4334 {
4335 struct elf_x86_init_table init_table;
4336
4337 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4338 {
4339 case is_normal:
4340 init_table.plt0_pad_byte = 0x0;
4341 init_table.lazy_plt = &elf_i386_lazy_plt;
4342 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4343 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4344 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4345 break;
4346 case is_vxworks:
4347 init_table.plt0_pad_byte = 0x90;
4348 init_table.lazy_plt = &elf_i386_lazy_plt;
4349 init_table.non_lazy_plt = NULL;
4350 init_table.lazy_ibt_plt = NULL;
4351 init_table.non_lazy_ibt_plt = NULL;
4352 break;
4353 case is_nacl:
4354 init_table.plt0_pad_byte = 0x90;
4355 init_table.lazy_plt = &elf_i386_nacl_plt;
4356 init_table.non_lazy_plt = NULL;
4357 init_table.lazy_ibt_plt = NULL;
4358 init_table.non_lazy_ibt_plt = NULL;
4359 break;
4360 }
4361
4362 init_table.r_info = elf32_r_info;
4363 init_table.r_sym = elf32_r_sym;
4364
4365 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4366 }
4367
4368 #define TARGET_LITTLE_SYM i386_elf32_vec
4369 #define TARGET_LITTLE_NAME "elf32-i386"
4370 #define ELF_ARCH bfd_arch_i386
4371 #define ELF_TARGET_ID I386_ELF_DATA
4372 #define ELF_MACHINE_CODE EM_386
4373 #define ELF_MAXPAGESIZE 0x1000
4374
4375 #define elf_backend_can_gc_sections 1
4376 #define elf_backend_can_refcount 1
4377 #define elf_backend_want_got_plt 1
4378 #define elf_backend_plt_readonly 1
4379 #define elf_backend_want_plt_sym 0
4380 #define elf_backend_got_header_size 12
4381 #define elf_backend_plt_alignment 4
4382 #define elf_backend_dtrel_excludes_plt 1
4383 #define elf_backend_extern_protected_data 1
4384 #define elf_backend_caches_rawsize 1
4385 #define elf_backend_want_dynrelro 1
4386
4387 /* Support RELA for objdump of prelink objects. */
4388 #define elf_info_to_howto elf_i386_info_to_howto_rel
4389 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4390
4391 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4392 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4393 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4394 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4395
4396 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4397 #define elf_backend_check_relocs elf_i386_check_relocs
4398 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4399 #define elf_backend_fake_sections elf_i386_fake_sections
4400 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4401 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4402 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4403 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4404 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4405 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4406 #define elf_backend_relocate_section elf_i386_relocate_section
4407 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4408 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4409
4410 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4411
4412 #include "elf32-target.h"
4413
4414 /* FreeBSD support. */
4415
4416 #undef TARGET_LITTLE_SYM
4417 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4418 #undef TARGET_LITTLE_NAME
4419 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4420 #undef ELF_OSABI
4421 #define ELF_OSABI ELFOSABI_FREEBSD
4422
4423 /* The kernel recognizes executables as valid only if they carry a
4424 "FreeBSD" label in the ELF header. So we put this label on all
4425 executables and (for simplicity) also all other object files. */
4426
4427 static void
4428 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4429 {
4430 _bfd_elf_post_process_headers (abfd, info);
4431
4432 #ifdef OLD_FREEBSD_ABI_LABEL
4433 {
4434 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4435 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4436 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4437 }
4438 #endif
4439 }
4440
4441 #undef elf_backend_post_process_headers
4442 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4443 #undef elf32_bed
4444 #define elf32_bed elf32_i386_fbsd_bed
4445
4446 #undef elf_backend_add_symbol_hook
4447
4448 #include "elf32-target.h"
4449
4450 /* Solaris 2. */
4451
4452 #undef TARGET_LITTLE_SYM
4453 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4454 #undef TARGET_LITTLE_NAME
4455 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4456
4457 #undef elf_backend_post_process_headers
4458
4459 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4460 objects won't be recognized. */
4461 #undef ELF_OSABI
4462
4463 #undef elf32_bed
4464 #define elf32_bed elf32_i386_sol2_bed
4465
4466 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4467 boundary. */
4468 #undef elf_backend_static_tls_alignment
4469 #define elf_backend_static_tls_alignment 8
4470
4471 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4472
4473 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4474 File, p.63. */
4475 #undef elf_backend_want_plt_sym
4476 #define elf_backend_want_plt_sym 1
4477
4478 #undef elf_backend_strtab_flags
4479 #define elf_backend_strtab_flags SHF_STRINGS
4480
4481 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4482 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4483 FALSE otherwise. ISECTION is the best guess matching section from the
4484 input bfd IBFD, but it might be NULL. */
4485
4486 static bfd_boolean
4487 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4488 bfd *obfd ATTRIBUTE_UNUSED,
4489 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4490 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4491 {
4492 /* PR 19938: FIXME: Need to add code for setting the sh_info
4493 and sh_link fields of Solaris specific section types. */
4494 return FALSE;
4495
4496 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4497 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4498
4499 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4500
4501 The following values should be set:
4502
4503 Type Link Info
4504 -----------------------------------------------------------------------------
4505 SHT_SUNW_ancillary The section header index of 0
4506 [0x6fffffee] the associated string table.
4507
4508 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4509 [0x6ffffff0] the associated symbol table. section header index of
4510 the associated
4511 SHT_SUNW_capchain table,
4512 otherwise 0.
4513
4514 SHT_SUNW_symsort The section header index of 0
4515 [0x6ffffff1] the associated symbol table.
4516
4517 SHT_SUNW_tlssort The section header index of 0
4518 [0x6ffffff2] the associated symbol table.
4519
4520 SHT_SUNW_LDYNSYM The section header index of One greater than the
4521 [0x6ffffff3] the associated string table. symbol table index of the
4522 This index is the same string last local symbol,
4523 table used by the SHT_DYNSYM STB_LOCAL. Since
4524 section. SHT_SUNW_LDYNSYM only
4525 contains local symbols,
4526 sh_info is equivalent to
4527 the number of symbols in
4528 the table.
4529
4530 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4531 [0x6ffffff5] the section header index of to named strings, the
4532 the associated section header index of
4533 SHT_SUNW_capinfo table, the associated string
4534 otherwise 0. table, otherwise 0.
4535
4536 SHT_SUNW_move The section header index of 0
4537 [0x6ffffffa] the associated symbol table.
4538
4539 SHT_SUNW_COMDAT 0 0
4540 [0x6ffffffb]
4541
4542 SHT_SUNW_syminfo The section header index of The section header index
4543 [0x6ffffffc] the associated symbol table. of the associated
4544 .dynamic section.
4545
4546 SHT_SUNW_verdef The section header index of The number of version
4547 [0x6ffffffd] the associated string table. definitions within the
4548 section.
4549
4550 SHT_SUNW_verneed The section header index of The number of version
4551 [0x6ffffffe] the associated string table. dependencies within the
4552 section.
4553
4554 SHT_SUNW_versym The section header index of 0
4555 [0x6fffffff] the associated symbol table. */
4556 }
4557
4558 #undef elf_backend_copy_special_section_fields
4559 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4560
4561 #include "elf32-target.h"
4562
4563 /* Intel MCU support. */
4564
4565 static bfd_boolean
4566 elf32_iamcu_elf_object_p (bfd *abfd)
4567 {
4568 /* Set the right machine number for an IAMCU elf32 file. */
4569 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4570 return TRUE;
4571 }
4572
4573 #undef TARGET_LITTLE_SYM
4574 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4575 #undef TARGET_LITTLE_NAME
4576 #define TARGET_LITTLE_NAME "elf32-iamcu"
4577 #undef ELF_ARCH
4578 #define ELF_ARCH bfd_arch_iamcu
4579
4580 #undef ELF_MACHINE_CODE
4581 #define ELF_MACHINE_CODE EM_IAMCU
4582
4583 #undef ELF_OSABI
4584
4585 #undef elf32_bed
4586 #define elf32_bed elf32_iamcu_bed
4587
4588 #undef elf_backend_object_p
4589 #define elf_backend_object_p elf32_iamcu_elf_object_p
4590
4591 #undef elf_backend_static_tls_alignment
4592
4593 #undef elf_backend_want_plt_sym
4594 #define elf_backend_want_plt_sym 0
4595
4596 #undef elf_backend_strtab_flags
4597 #undef elf_backend_copy_special_section_fields
4598
4599 #include "elf32-target.h"
4600
4601 /* Restore defaults. */
4602 #undef ELF_ARCH
4603 #define ELF_ARCH bfd_arch_i386
4604 #undef ELF_MACHINE_CODE
4605 #define ELF_MACHINE_CODE EM_386
4606
4607 /* Native Client support. */
4608
4609 #undef TARGET_LITTLE_SYM
4610 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4611 #undef TARGET_LITTLE_NAME
4612 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4613 #undef elf32_bed
4614 #define elf32_bed elf32_i386_nacl_bed
4615
4616 #undef ELF_MAXPAGESIZE
4617 #define ELF_MAXPAGESIZE 0x10000
4618
4619 /* Restore defaults. */
4620 #undef ELF_OSABI
4621 #undef elf_backend_want_plt_sym
4622 #define elf_backend_want_plt_sym 0
4623 #undef elf_backend_post_process_headers
4624 #undef elf_backend_static_tls_alignment
4625
4626 /* NaCl uses substantially different PLT entries for the same effects. */
4627
4628 #undef elf_backend_plt_alignment
4629 #define elf_backend_plt_alignment 5
4630 #define NACL_PLT_ENTRY_SIZE 64
4631 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4632
4633 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4634 {
4635 0xff, 0x35, /* pushl contents of address */
4636 0, 0, 0, 0, /* replaced with address of .got + 4. */
4637 0x8b, 0x0d, /* movl contents of address, %ecx */
4638 0, 0, 0, 0, /* replaced with address of .got + 8. */
4639 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4640 0xff, 0xe1 /* jmp *%ecx */
4641 };
4642
4643 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4644 {
4645 0x8b, 0x0d, /* movl contents of address, %ecx */
4646 0, 0, 0, 0, /* replaced with GOT slot address. */
4647 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4648 0xff, 0xe1, /* jmp *%ecx */
4649
4650 /* Pad to the next 32-byte boundary with nop instructions. */
4651 0x90,
4652 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4653 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4654
4655 /* Lazy GOT entries point here (32-byte aligned). */
4656 0x68, /* pushl immediate */
4657 0, 0, 0, 0, /* replaced with reloc offset. */
4658 0xe9, /* jmp relative */
4659 0, 0, 0, 0, /* replaced with offset to .plt. */
4660
4661 /* Pad to the next 32-byte boundary with nop instructions. */
4662 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4663 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4664 0x90, 0x90
4665 };
4666
4667 static const bfd_byte
4668 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4669 {
4670 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4671 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4672 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4673 0xff, 0xe1, /* jmp *%ecx */
4674
4675 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4676 so pad to that size with nop instructions. */
4677 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4678 };
4679
4680 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4681 {
4682 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4683 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4684 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4685 0xff, 0xe1, /* jmp *%ecx */
4686
4687 /* Pad to the next 32-byte boundary with nop instructions. */
4688 0x90,
4689 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4690 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4691
4692 /* Lazy GOT entries point here (32-byte aligned). */
4693 0x68, /* pushl immediate */
4694 0, 0, 0, 0, /* replaced with offset into relocation table. */
4695 0xe9, /* jmp relative */
4696 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4697
4698 /* Pad to the next 32-byte boundary with nop instructions. */
4699 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4700 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4701 0x90, 0x90
4702 };
4703
4704 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4705 {
4706 #if (PLT_CIE_LENGTH != 20 \
4707 || PLT_FDE_LENGTH != 36 \
4708 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4709 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4710 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4711 #endif
4712 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4713 0, 0, 0, 0, /* CIE ID */
4714 1, /* CIE version */
4715 'z', 'R', 0, /* Augmentation string */
4716 1, /* Code alignment factor */
4717 0x7c, /* Data alignment factor: -4 */
4718 8, /* Return address column */
4719 1, /* Augmentation size */
4720 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4721 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4722 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4723 DW_CFA_nop, DW_CFA_nop,
4724
4725 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4726 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4727 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4728 0, 0, 0, 0, /* .plt size goes here */
4729 0, /* Augmentation size */
4730 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4731 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4732 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4733 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4734 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4735 13, /* Block length */
4736 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4737 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4738 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4739 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4740 DW_CFA_nop, DW_CFA_nop
4741 };
4742
4743 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4744 {
4745 elf_i386_nacl_plt0_entry, /* plt0_entry */
4746 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4747 elf_i386_nacl_plt_entry, /* plt_entry */
4748 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4749 2, /* plt0_got1_offset */
4750 8, /* plt0_got2_offset */
4751 0, /* plt0_got2_insn_end */
4752 2, /* plt_got_offset */
4753 33, /* plt_reloc_offset */
4754 38, /* plt_plt_offset */
4755 0, /* plt_got_insn_size */
4756 0, /* plt_plt_insn_end */
4757 32, /* plt_lazy_offset */
4758 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4759 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4760 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4761 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4762 };
4763
4764 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4765 {
4766 is_nacl /* os */
4767 };
4768
4769 static bfd_boolean
4770 elf32_i386_nacl_elf_object_p (bfd *abfd)
4771 {
4772 /* Set the right machine number for a NaCl i386 ELF32 file. */
4773 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4774 return TRUE;
4775 }
4776
4777 #undef elf_backend_arch_data
4778 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4779
4780 #undef elf_backend_object_p
4781 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4782 #undef elf_backend_modify_segment_map
4783 #define elf_backend_modify_segment_map nacl_modify_segment_map
4784 #undef elf_backend_modify_program_headers
4785 #define elf_backend_modify_program_headers nacl_modify_program_headers
4786 #undef elf_backend_final_write_processing
4787 #define elf_backend_final_write_processing nacl_final_write_processing
4788
4789 #include "elf32-target.h"
4790
4791 /* Restore defaults. */
4792 #undef elf_backend_object_p
4793 #undef elf_backend_modify_segment_map
4794 #undef elf_backend_modify_program_headers
4795 #undef elf_backend_final_write_processing
4796
4797 /* VxWorks support. */
4798
4799 #undef TARGET_LITTLE_SYM
4800 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4801 #undef TARGET_LITTLE_NAME
4802 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4803 #undef ELF_OSABI
4804 #undef ELF_MAXPAGESIZE
4805 #define ELF_MAXPAGESIZE 0x1000
4806 #undef elf_backend_plt_alignment
4807 #define elf_backend_plt_alignment 4
4808
4809 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4810 {
4811 is_vxworks /* os */
4812 };
4813
4814 #undef elf_backend_arch_data
4815 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4816
4817 #undef elf_backend_relocs_compatible
4818 #undef elf_backend_add_symbol_hook
4819 #define elf_backend_add_symbol_hook \
4820 elf_vxworks_add_symbol_hook
4821 #undef elf_backend_link_output_symbol_hook
4822 #define elf_backend_link_output_symbol_hook \
4823 elf_vxworks_link_output_symbol_hook
4824 #undef elf_backend_emit_relocs
4825 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4826 #undef elf_backend_final_write_processing
4827 #define elf_backend_final_write_processing \
4828 elf_vxworks_final_write_processing
4829 #undef elf_backend_static_tls_alignment
4830
4831 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4832 define it. */
4833 #undef elf_backend_want_plt_sym
4834 #define elf_backend_want_plt_sym 1
4835
4836 #undef elf32_bed
4837 #define elf32_bed elf32_i386_vxworks_bed
4838
4839 #include "elf32-target.h"
GDB Binutils - Deliverables
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