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x86: Remove the unused _GLOBAL_OFFSET_TABLE_
[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 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1582 if (h == htab->elf.hgot)
1583 htab->got_referenced = TRUE;
1584
1585 switch (r_type)
1586 {
1587 case R_386_TLS_LDM:
1588 htab->tls_ld_or_ldm_got.refcount = 1;
1589 goto create_got;
1590
1591 case R_386_PLT32:
1592 /* This symbol requires a procedure linkage table entry. We
1593 actually build the entry in adjust_dynamic_symbol,
1594 because this might be a case of linking PIC code which is
1595 never referenced by a dynamic object, in which case we
1596 don't need to generate a procedure linkage table entry
1597 after all. */
1598
1599 /* If this is a local symbol, we resolve it directly without
1600 creating a procedure linkage table entry. */
1601 if (h == NULL)
1602 continue;
1603
1604 eh->zero_undefweak &= 0x2;
1605 h->needs_plt = 1;
1606 h->plt.refcount = 1;
1607 break;
1608
1609 case R_386_SIZE32:
1610 size_reloc = TRUE;
1611 goto do_size;
1612
1613 case R_386_TLS_IE_32:
1614 case R_386_TLS_IE:
1615 case R_386_TLS_GOTIE:
1616 if (!bfd_link_executable (info))
1617 info->flags |= DF_STATIC_TLS;
1618 /* Fall through */
1619
1620 case R_386_GOT32:
1621 case R_386_GOT32X:
1622 case R_386_TLS_GD:
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1626 {
1627 int tls_type, old_tls_type;
1628
1629 switch (r_type)
1630 {
1631 default:
1632 case R_386_GOT32:
1633 case R_386_GOT32X:
1634 tls_type = GOT_NORMAL;
1635 break;
1636 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1637 case R_386_TLS_GOTDESC:
1638 case R_386_TLS_DESC_CALL:
1639 tls_type = GOT_TLS_GDESC; break;
1640 case R_386_TLS_IE_32:
1641 if (ELF32_R_TYPE (rel->r_info) == r_type)
1642 tls_type = GOT_TLS_IE_NEG;
1643 else
1644 /* If this is a GD->IE transition, we may use either of
1645 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1646 tls_type = GOT_TLS_IE;
1647 break;
1648 case R_386_TLS_IE:
1649 case R_386_TLS_GOTIE:
1650 tls_type = GOT_TLS_IE_POS; break;
1651 }
1652
1653 if (h != NULL)
1654 {
1655 h->got.refcount = 1;
1656 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1657 }
1658 else
1659 {
1660 bfd_signed_vma *local_got_refcounts;
1661
1662 /* This is a global offset table entry for a local symbol. */
1663 local_got_refcounts = elf_local_got_refcounts (abfd);
1664 if (local_got_refcounts == NULL)
1665 {
1666 bfd_size_type size;
1667
1668 size = symtab_hdr->sh_info;
1669 size *= (sizeof (bfd_signed_vma)
1670 + sizeof (bfd_vma) + sizeof(char));
1671 local_got_refcounts = (bfd_signed_vma *)
1672 bfd_zalloc (abfd, size);
1673 if (local_got_refcounts == NULL)
1674 goto error_return;
1675 elf_local_got_refcounts (abfd) = local_got_refcounts;
1676 elf_x86_local_tlsdesc_gotent (abfd)
1677 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1678 elf_x86_local_got_tls_type (abfd)
1679 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1680 }
1681 local_got_refcounts[r_symndx] = 1;
1682 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1683 }
1684
1685 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1686 tls_type |= old_tls_type;
1687 /* If a TLS symbol is accessed using IE at least once,
1688 there is no point to use dynamic model for it. */
1689 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1690 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1691 || (tls_type & GOT_TLS_IE) == 0))
1692 {
1693 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type = old_tls_type;
1695 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1696 && GOT_TLS_GD_ANY_P (tls_type))
1697 tls_type |= old_tls_type;
1698 else
1699 {
1700 if (h)
1701 name = h->root.root.string;
1702 else
1703 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1704 NULL);
1705 _bfd_error_handler
1706 /* xgettext:c-format */
1707 (_("%B: `%s' accessed both as normal and "
1708 "thread local symbol"),
1709 abfd, name);
1710 bfd_set_error (bfd_error_bad_value);
1711 goto error_return;
1712 }
1713 }
1714
1715 if (old_tls_type != tls_type)
1716 {
1717 if (h != NULL)
1718 elf_x86_hash_entry (h)->tls_type = tls_type;
1719 else
1720 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1721 }
1722 }
1723 /* Fall through */
1724
1725 case R_386_GOTOFF:
1726 case R_386_GOTPC:
1727 create_got:
1728 if (r_type != R_386_TLS_IE)
1729 {
1730 if (eh != NULL)
1731 {
1732 eh->zero_undefweak &= 0x2;
1733
1734 /* Need GOT to resolve undefined weak symbol to 0. */
1735 if (r_type == R_386_GOTOFF
1736 && h->root.type == bfd_link_hash_undefweak
1737 && bfd_link_executable (info))
1738 htab->got_referenced = TRUE;
1739 }
1740 break;
1741 }
1742 /* Fall through */
1743
1744 case R_386_TLS_LE_32:
1745 case R_386_TLS_LE:
1746 if (eh != NULL)
1747 eh->zero_undefweak &= 0x2;
1748 if (bfd_link_executable (info))
1749 break;
1750 info->flags |= DF_STATIC_TLS;
1751 goto do_relocation;
1752
1753 case R_386_32:
1754 case R_386_PC32:
1755 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1756 eh->zero_undefweak |= 0x2;
1757 do_relocation:
1758 /* We are called after all symbols have been resolved. Only
1759 relocation against STT_GNU_IFUNC symbol must go through
1760 PLT. */
1761 if (h != NULL
1762 && (bfd_link_executable (info)
1763 || h->type == STT_GNU_IFUNC))
1764 {
1765 bfd_boolean func_pointer_ref = FALSE;
1766
1767 if (r_type == R_386_PC32)
1768 {
1769 /* Since something like ".long foo - ." may be used
1770 as pointer, make sure that PLT is used if foo is
1771 a function defined in a shared library. */
1772 if ((sec->flags & SEC_CODE) == 0)
1773 h->pointer_equality_needed = 1;
1774 else if (h->type == STT_GNU_IFUNC
1775 && bfd_link_pic (info))
1776 {
1777 _bfd_error_handler
1778 /* xgettext:c-format */
1779 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1780 abfd, h->root.root.string);
1781 bfd_set_error (bfd_error_bad_value);
1782 goto error_return;
1783 }
1784 }
1785 else
1786 {
1787 h->pointer_equality_needed = 1;
1788 /* R_386_32 can be resolved at run-time. */
1789 if (r_type == R_386_32
1790 && (sec->flags & SEC_READONLY) == 0)
1791 func_pointer_ref = TRUE;
1792 }
1793
1794 if (!func_pointer_ref)
1795 {
1796 /* If this reloc is in a read-only section, we might
1797 need a copy reloc. We can't check reliably at this
1798 stage whether the section is read-only, as input
1799 sections have not yet been mapped to output sections.
1800 Tentatively set the flag for now, and correct in
1801 adjust_dynamic_symbol. */
1802 h->non_got_ref = 1;
1803
1804 /* We may need a .plt entry if the symbol is a function
1805 defined in a shared lib or is a function referenced
1806 from the code or read-only section. */
1807 if (!h->def_regular
1808 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1809 h->plt.refcount = 1;
1810 }
1811 }
1812
1813 size_reloc = FALSE;
1814 do_size:
1815 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
1816 R_386_32))
1817 {
1818 struct elf_dyn_relocs *p;
1819 struct elf_dyn_relocs **head;
1820
1821 /* We must copy these reloc types into the output file.
1822 Create a reloc section in dynobj and make room for
1823 this reloc. */
1824 if (sreloc == NULL)
1825 {
1826 sreloc = _bfd_elf_make_dynamic_reloc_section
1827 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1828
1829 if (sreloc == NULL)
1830 goto error_return;
1831 }
1832
1833 /* If this is a global symbol, we count the number of
1834 relocations we need for this symbol. */
1835 if (h != NULL)
1836 {
1837 head = &eh->dyn_relocs;
1838 }
1839 else
1840 {
1841 /* Track dynamic relocs needed for local syms too.
1842 We really need local syms available to do this
1843 easily. Oh well. */
1844 void **vpp;
1845 asection *s;
1846
1847 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1848 abfd, r_symndx);
1849 if (isym == NULL)
1850 goto error_return;
1851
1852 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1853 if (s == NULL)
1854 s = sec;
1855
1856 vpp = &elf_section_data (s)->local_dynrel;
1857 head = (struct elf_dyn_relocs **)vpp;
1858 }
1859
1860 p = *head;
1861 if (p == NULL || p->sec != sec)
1862 {
1863 bfd_size_type amt = sizeof *p;
1864 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1865 amt);
1866 if (p == NULL)
1867 goto error_return;
1868 p->next = *head;
1869 *head = p;
1870 p->sec = sec;
1871 p->count = 0;
1872 p->pc_count = 0;
1873 }
1874
1875 p->count += 1;
1876 /* Count size relocation as PC-relative relocation. */
1877 if (r_type == R_386_PC32 || size_reloc)
1878 p->pc_count += 1;
1879 }
1880 break;
1881
1882 /* This relocation describes the C++ object vtable hierarchy.
1883 Reconstruct it for later use during GC. */
1884 case R_386_GNU_VTINHERIT:
1885 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1886 goto error_return;
1887 break;
1888
1889 /* This relocation describes which C++ vtable entries are actually
1890 used. Record for later use during GC. */
1891 case R_386_GNU_VTENTRY:
1892 BFD_ASSERT (h != NULL);
1893 if (h != NULL
1894 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1895 goto error_return;
1896 break;
1897
1898 default:
1899 break;
1900 }
1901 }
1902
1903 if (elf_section_data (sec)->this_hdr.contents != contents)
1904 {
1905 if (!converted && !info->keep_memory)
1906 free (contents);
1907 else
1908 {
1909 /* Cache the section contents for elf_link_input_bfd if any
1910 load is converted or --no-keep-memory isn't used. */
1911 elf_section_data (sec)->this_hdr.contents = contents;
1912 }
1913 }
1914
1915 /* Cache relocations if any load is converted. */
1916 if (elf_section_data (sec)->relocs != relocs && converted)
1917 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1918
1919 return TRUE;
1920
1921 error_return:
1922 if (elf_section_data (sec)->this_hdr.contents != contents)
1923 free (contents);
1924 sec->check_relocs_failed = 1;
1925 return FALSE;
1926 }
1927
1928 /* Set the correct type for an x86 ELF section. We do this by the
1929 section name, which is a hack, but ought to work. */
1930
1931 static bfd_boolean
1932 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1933 Elf_Internal_Shdr *hdr,
1934 asection *sec)
1935 {
1936 const char *name;
1937
1938 name = bfd_get_section_name (abfd, sec);
1939
1940 /* This is an ugly, but unfortunately necessary hack that is
1941 needed when producing EFI binaries on x86. It tells
1942 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1943 containing ELF relocation info. We need this hack in order to
1944 be able to generate ELF binaries that can be translated into
1945 EFI applications (which are essentially COFF objects). Those
1946 files contain a COFF ".reloc" section inside an ELFNN object,
1947 which would normally cause BFD to segfault because it would
1948 attempt to interpret this section as containing relocation
1949 entries for section "oc". With this hack enabled, ".reloc"
1950 will be treated as a normal data section, which will avoid the
1951 segfault. However, you won't be able to create an ELFNN binary
1952 with a section named "oc" that needs relocations, but that's
1953 the kind of ugly side-effects you get when detecting section
1954 types based on their names... In practice, this limitation is
1955 unlikely to bite. */
1956 if (strcmp (name, ".reloc") == 0)
1957 hdr->sh_type = SHT_PROGBITS;
1958
1959 return TRUE;
1960 }
1961
1962 /* Return the relocation value for @tpoff relocation
1963 if STT_TLS virtual address is ADDRESS. */
1964
1965 static bfd_vma
1966 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1967 {
1968 struct elf_link_hash_table *htab = elf_hash_table (info);
1969 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1970 bfd_vma static_tls_size;
1971
1972 /* If tls_sec is NULL, we should have signalled an error already. */
1973 if (htab->tls_sec == NULL)
1974 return 0;
1975
1976 /* Consider special static TLS alignment requirements. */
1977 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1978 return static_tls_size + htab->tls_sec->vma - address;
1979 }
1980
1981 /* Relocate an i386 ELF section. */
1982
1983 static bfd_boolean
1984 elf_i386_relocate_section (bfd *output_bfd,
1985 struct bfd_link_info *info,
1986 bfd *input_bfd,
1987 asection *input_section,
1988 bfd_byte *contents,
1989 Elf_Internal_Rela *relocs,
1990 Elf_Internal_Sym *local_syms,
1991 asection **local_sections)
1992 {
1993 struct elf_x86_link_hash_table *htab;
1994 Elf_Internal_Shdr *symtab_hdr;
1995 struct elf_link_hash_entry **sym_hashes;
1996 bfd_vma *local_got_offsets;
1997 bfd_vma *local_tlsdesc_gotents;
1998 Elf_Internal_Rela *rel;
1999 Elf_Internal_Rela *wrel;
2000 Elf_Internal_Rela *relend;
2001 bfd_boolean is_vxworks_tls;
2002 unsigned plt_entry_size;
2003
2004 /* Skip if check_relocs failed. */
2005 if (input_section->check_relocs_failed)
2006 return FALSE;
2007
2008 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2009 if (htab == NULL)
2010 return FALSE;
2011
2012 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2013
2014 symtab_hdr = &elf_symtab_hdr (input_bfd);
2015 sym_hashes = elf_sym_hashes (input_bfd);
2016 local_got_offsets = elf_local_got_offsets (input_bfd);
2017 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2018 /* We have to handle relocations in vxworks .tls_vars sections
2019 specially, because the dynamic loader is 'weird'. */
2020 is_vxworks_tls = (htab->target_os == is_vxworks
2021 && bfd_link_pic (info)
2022 && !strcmp (input_section->output_section->name,
2023 ".tls_vars"));
2024
2025 _bfd_x86_elf_set_tls_module_base (info);
2026
2027 plt_entry_size = htab->plt.plt_entry_size;
2028
2029 rel = wrel = relocs;
2030 relend = relocs + input_section->reloc_count;
2031 for (; rel < relend; wrel++, rel++)
2032 {
2033 unsigned int r_type, r_type_tls;
2034 reloc_howto_type *howto;
2035 unsigned long r_symndx;
2036 struct elf_link_hash_entry *h;
2037 struct elf_x86_link_hash_entry *eh;
2038 Elf_Internal_Sym *sym;
2039 asection *sec;
2040 bfd_vma off, offplt, plt_offset;
2041 bfd_vma relocation;
2042 bfd_boolean unresolved_reloc;
2043 bfd_reloc_status_type r;
2044 unsigned int indx;
2045 int tls_type;
2046 bfd_vma st_size;
2047 asection *resolved_plt;
2048 bfd_boolean resolved_to_zero;
2049 bfd_boolean relative_reloc;
2050
2051 r_type = ELF32_R_TYPE (rel->r_info);
2052 if (r_type == R_386_GNU_VTINHERIT
2053 || r_type == R_386_GNU_VTENTRY)
2054 {
2055 if (wrel != rel)
2056 *wrel = *rel;
2057 continue;
2058 }
2059
2060 if ((indx = r_type) >= R_386_standard
2061 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2062 >= R_386_ext - R_386_standard)
2063 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2064 >= R_386_ext2 - R_386_ext))
2065 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2066
2067 howto = elf_howto_table + indx;
2068
2069 r_symndx = ELF32_R_SYM (rel->r_info);
2070 h = NULL;
2071 sym = NULL;
2072 sec = NULL;
2073 unresolved_reloc = FALSE;
2074 if (r_symndx < symtab_hdr->sh_info)
2075 {
2076 sym = local_syms + r_symndx;
2077 sec = local_sections[r_symndx];
2078 relocation = (sec->output_section->vma
2079 + sec->output_offset
2080 + sym->st_value);
2081 st_size = sym->st_size;
2082
2083 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2084 && ((sec->flags & SEC_MERGE) != 0
2085 || (bfd_link_relocatable (info)
2086 && sec->output_offset != 0)))
2087 {
2088 bfd_vma addend;
2089 bfd_byte *where = contents + rel->r_offset;
2090
2091 switch (howto->size)
2092 {
2093 case 0:
2094 addend = bfd_get_8 (input_bfd, where);
2095 if (howto->pc_relative)
2096 {
2097 addend = (addend ^ 0x80) - 0x80;
2098 addend += 1;
2099 }
2100 break;
2101 case 1:
2102 addend = bfd_get_16 (input_bfd, where);
2103 if (howto->pc_relative)
2104 {
2105 addend = (addend ^ 0x8000) - 0x8000;
2106 addend += 2;
2107 }
2108 break;
2109 case 2:
2110 addend = bfd_get_32 (input_bfd, where);
2111 if (howto->pc_relative)
2112 {
2113 addend = (addend ^ 0x80000000) - 0x80000000;
2114 addend += 4;
2115 }
2116 break;
2117 default:
2118 abort ();
2119 }
2120
2121 if (bfd_link_relocatable (info))
2122 addend += sec->output_offset;
2123 else
2124 {
2125 asection *msec = sec;
2126 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2127 addend);
2128 addend -= relocation;
2129 addend += msec->output_section->vma + msec->output_offset;
2130 }
2131
2132 switch (howto->size)
2133 {
2134 case 0:
2135 /* FIXME: overflow checks. */
2136 if (howto->pc_relative)
2137 addend -= 1;
2138 bfd_put_8 (input_bfd, addend, where);
2139 break;
2140 case 1:
2141 if (howto->pc_relative)
2142 addend -= 2;
2143 bfd_put_16 (input_bfd, addend, where);
2144 break;
2145 case 2:
2146 if (howto->pc_relative)
2147 addend -= 4;
2148 bfd_put_32 (input_bfd, addend, where);
2149 break;
2150 }
2151 }
2152 else if (!bfd_link_relocatable (info)
2153 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2154 {
2155 /* Relocate against local STT_GNU_IFUNC symbol. */
2156 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2157 FALSE);
2158 if (h == NULL)
2159 abort ();
2160
2161 /* Set STT_GNU_IFUNC symbol value. */
2162 h->root.u.def.value = sym->st_value;
2163 h->root.u.def.section = sec;
2164 }
2165 }
2166 else
2167 {
2168 bfd_boolean warned ATTRIBUTE_UNUSED;
2169 bfd_boolean ignored ATTRIBUTE_UNUSED;
2170
2171 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2172 r_symndx, symtab_hdr, sym_hashes,
2173 h, sec, relocation,
2174 unresolved_reloc, warned, ignored);
2175 st_size = h->size;
2176 }
2177
2178 if (sec != NULL && discarded_section (sec))
2179 {
2180 _bfd_clear_contents (howto, input_bfd, input_section,
2181 contents + rel->r_offset);
2182 wrel->r_offset = rel->r_offset;
2183 wrel->r_info = 0;
2184 wrel->r_addend = 0;
2185
2186 /* For ld -r, remove relocations in debug sections against
2187 sections defined in discarded sections. Not done for
2188 eh_frame editing code expects to be present. */
2189 if (bfd_link_relocatable (info)
2190 && (input_section->flags & SEC_DEBUGGING))
2191 wrel--;
2192
2193 continue;
2194 }
2195
2196 if (bfd_link_relocatable (info))
2197 {
2198 if (wrel != rel)
2199 *wrel = *rel;
2200 continue;
2201 }
2202
2203 eh = (struct elf_x86_link_hash_entry *) h;
2204
2205 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2206 it here if it is defined in a non-shared object. */
2207 if (h != NULL
2208 && h->type == STT_GNU_IFUNC
2209 && h->def_regular)
2210 {
2211 asection *gotplt, *base_got;
2212 bfd_vma plt_index;
2213 const char *name;
2214
2215 if ((input_section->flags & SEC_ALLOC) == 0)
2216 {
2217 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2218 sections because such sections are not SEC_ALLOC and
2219 thus ld.so will not process them. */
2220 if ((input_section->flags & SEC_DEBUGGING) != 0)
2221 continue;
2222 abort ();
2223 }
2224
2225 /* STT_GNU_IFUNC symbol must go through PLT. */
2226 if (htab->elf.splt != NULL)
2227 {
2228 if (htab->plt_second != NULL)
2229 {
2230 resolved_plt = htab->plt_second;
2231 plt_offset = eh->plt_second.offset;
2232 }
2233 else
2234 {
2235 resolved_plt = htab->elf.splt;
2236 plt_offset = h->plt.offset;
2237 }
2238 gotplt = htab->elf.sgotplt;
2239 }
2240 else
2241 {
2242 resolved_plt = htab->elf.iplt;
2243 plt_offset = h->plt.offset;
2244 gotplt = htab->elf.igotplt;
2245 }
2246
2247 switch (r_type)
2248 {
2249 default:
2250 break;
2251
2252 case R_386_GOT32:
2253 case R_386_GOT32X:
2254 base_got = htab->elf.sgot;
2255 off = h->got.offset;
2256
2257 if (base_got == NULL)
2258 abort ();
2259
2260 if (off == (bfd_vma) -1)
2261 {
2262 /* We can't use h->got.offset here to save state, or
2263 even just remember the offset, as finish_dynamic_symbol
2264 would use that as offset into .got. */
2265
2266 if (h->plt.offset == (bfd_vma) -1)
2267 abort ();
2268
2269 if (htab->elf.splt != NULL)
2270 {
2271 plt_index = (h->plt.offset / plt_entry_size
2272 - htab->plt.has_plt0);
2273 off = (plt_index + 3) * 4;
2274 base_got = htab->elf.sgotplt;
2275 }
2276 else
2277 {
2278 plt_index = h->plt.offset / plt_entry_size;
2279 off = plt_index * 4;
2280 base_got = htab->elf.igotplt;
2281 }
2282
2283 if (h->dynindx == -1
2284 || h->forced_local
2285 || info->symbolic)
2286 {
2287 /* This references the local defitionion. We must
2288 initialize this entry in the global offset table.
2289 Since the offset must always be a multiple of 8,
2290 we use the least significant bit to record
2291 whether we have initialized it already.
2292
2293 When doing a dynamic link, we create a .rela.got
2294 relocation entry to initialize the value. This
2295 is done in the finish_dynamic_symbol routine. */
2296 if ((off & 1) != 0)
2297 off &= ~1;
2298 else
2299 {
2300 bfd_put_32 (output_bfd, relocation,
2301 base_got->contents + off);
2302 h->got.offset |= 1;
2303 }
2304 }
2305
2306 relocation = off;
2307 }
2308 else
2309 relocation = (base_got->output_section->vma
2310 + base_got->output_offset + off
2311 - gotplt->output_section->vma
2312 - gotplt->output_offset);
2313
2314 if (rel->r_offset > 1
2315 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2316 && *(contents + rel->r_offset - 2) != 0x8d)
2317 {
2318 if (bfd_link_pic (info))
2319 goto disallow_got32;
2320
2321 /* Add the GOT base if there is no base register. */
2322 relocation += (gotplt->output_section->vma
2323 + gotplt->output_offset);
2324 }
2325 else if (htab->elf.splt == NULL)
2326 {
2327 /* Adjust for static executables. */
2328 relocation += gotplt->output_offset;
2329 }
2330
2331 goto do_relocation;
2332 }
2333
2334 if (h->plt.offset == (bfd_vma) -1)
2335 {
2336 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2337 if (r_type == R_386_32
2338 && (input_section->flags & SEC_CODE) == 0)
2339 goto do_ifunc_pointer;
2340 goto bad_ifunc_reloc;
2341 }
2342
2343 relocation = (resolved_plt->output_section->vma
2344 + resolved_plt->output_offset + plt_offset);
2345
2346 switch (r_type)
2347 {
2348 default:
2349 bad_ifunc_reloc:
2350 if (h->root.root.string)
2351 name = h->root.root.string;
2352 else
2353 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2354 NULL);
2355 _bfd_error_handler
2356 /* xgettext:c-format */
2357 (_("%B: relocation %s against STT_GNU_IFUNC "
2358 "symbol `%s' isn't supported"), input_bfd,
2359 howto->name, name);
2360 bfd_set_error (bfd_error_bad_value);
2361 return FALSE;
2362
2363 case R_386_32:
2364 /* Generate dynamic relcoation only when there is a
2365 non-GOT reference in a shared object. */
2366 if ((bfd_link_pic (info) && h->non_got_ref)
2367 || h->plt.offset == (bfd_vma) -1)
2368 {
2369 Elf_Internal_Rela outrel;
2370 asection *sreloc;
2371 bfd_vma offset;
2372
2373 do_ifunc_pointer:
2374 /* Need a dynamic relocation to get the real function
2375 adddress. */
2376 offset = _bfd_elf_section_offset (output_bfd,
2377 info,
2378 input_section,
2379 rel->r_offset);
2380 if (offset == (bfd_vma) -1
2381 || offset == (bfd_vma) -2)
2382 abort ();
2383
2384 outrel.r_offset = (input_section->output_section->vma
2385 + input_section->output_offset
2386 + offset);
2387
2388 if (POINTER_LOCAL_IFUNC_P (info, h))
2389 {
2390 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2391 h->root.root.string,
2392 h->root.u.def.section->owner);
2393
2394 /* This symbol is resolved locally. */
2395 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2396 bfd_put_32 (output_bfd,
2397 (h->root.u.def.value
2398 + h->root.u.def.section->output_section->vma
2399 + h->root.u.def.section->output_offset),
2400 contents + offset);
2401 }
2402 else
2403 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2404
2405 /* Dynamic relocations are stored in
2406 1. .rel.ifunc section in PIC object.
2407 2. .rel.got section in dynamic executable.
2408 3. .rel.iplt section in static executable. */
2409 if (bfd_link_pic (info))
2410 sreloc = htab->elf.irelifunc;
2411 else if (htab->elf.splt != NULL)
2412 sreloc = htab->elf.srelgot;
2413 else
2414 sreloc = htab->elf.irelplt;
2415 elf_append_rel (output_bfd, sreloc, &outrel);
2416
2417 /* If this reloc is against an external symbol, we
2418 do not want to fiddle with the addend. Otherwise,
2419 we need to include the symbol value so that it
2420 becomes an addend for the dynamic reloc. For an
2421 internal symbol, we have updated addend. */
2422 continue;
2423 }
2424 /* FALLTHROUGH */
2425 case R_386_PC32:
2426 case R_386_PLT32:
2427 goto do_relocation;
2428
2429 case R_386_GOTOFF:
2430 relocation -= (gotplt->output_section->vma
2431 + gotplt->output_offset);
2432 goto do_relocation;
2433 }
2434 }
2435
2436 resolved_to_zero = (eh != NULL
2437 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2438
2439 switch (r_type)
2440 {
2441 case R_386_GOT32X:
2442 /* Avoid optimizing _DYNAMIC since ld.so may use its
2443 link-time address. */
2444 if (h == htab->elf.hdynamic)
2445 goto r_386_got32;
2446
2447 if (bfd_link_pic (info))
2448 {
2449 /* It is OK to convert mov to lea and convert indirect
2450 branch to direct branch. It is OK to convert adc,
2451 add, and, cmp, or, sbb, sub, test, xor only when PIC
2452 is false. */
2453 unsigned int opcode, addend;
2454 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2455 if (addend != 0)
2456 goto r_386_got32;
2457 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2458 if (opcode != 0x8b && opcode != 0xff)
2459 goto r_386_got32;
2460 }
2461
2462 /* Resolve "mov GOT[(%reg)], %reg",
2463 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2464 and "binop foo@GOT[(%reg)], %reg". */
2465 if (h == NULL
2466 || (h->plt.offset == (bfd_vma) -1
2467 && h->got.offset == (bfd_vma) -1)
2468 || htab->elf.sgotplt == NULL)
2469 abort ();
2470
2471 offplt = (htab->elf.sgotplt->output_section->vma
2472 + htab->elf.sgotplt->output_offset);
2473
2474 /* It is relative to .got.plt section. */
2475 if (h->got.offset != (bfd_vma) -1)
2476 /* Use GOT entry. Mask off the least significant bit in
2477 GOT offset which may be set by R_386_GOT32 processing
2478 below. */
2479 relocation = (htab->elf.sgot->output_section->vma
2480 + htab->elf.sgot->output_offset
2481 + (h->got.offset & ~1) - offplt);
2482 else
2483 /* Use GOTPLT entry. */
2484 relocation = (h->plt.offset / plt_entry_size
2485 - htab->plt.has_plt0 + 3) * 4;
2486
2487 if (!bfd_link_pic (info))
2488 {
2489 /* If not PIC, add the .got.plt section address for
2490 baseless addressing. */
2491 unsigned int modrm;
2492 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2493 if ((modrm & 0xc7) == 0x5)
2494 relocation += offplt;
2495 }
2496
2497 unresolved_reloc = FALSE;
2498 break;
2499
2500 case R_386_GOT32:
2501 r_386_got32:
2502 /* Relocation is to the entry for this symbol in the global
2503 offset table. */
2504 if (htab->elf.sgot == NULL)
2505 abort ();
2506
2507 relative_reloc = FALSE;
2508 if (h != NULL)
2509 {
2510 off = h->got.offset;
2511 if (RESOLVED_LOCALLY_P (info, h, htab))
2512 {
2513 /* We must initialize this entry in the global offset
2514 table. Since the offset must always be a multiple
2515 of 4, we use the least significant bit to record
2516 whether we have initialized it already.
2517
2518 When doing a dynamic link, we create a .rel.got
2519 relocation entry to initialize the value. This
2520 is done in the finish_dynamic_symbol routine. */
2521 if ((off & 1) != 0)
2522 off &= ~1;
2523 else
2524 {
2525 bfd_put_32 (output_bfd, relocation,
2526 htab->elf.sgot->contents + off);
2527 h->got.offset |= 1;
2528
2529 if (GENERATE_RELATIVE_RELOC_P (info, h))
2530 {
2531 /* PR ld/21402: If this symbol isn't dynamic
2532 in PIC, generate R_386_RELATIVE here. */
2533 eh->no_finish_dynamic_symbol = 1;
2534 relative_reloc = TRUE;
2535 }
2536 }
2537 }
2538 else
2539 unresolved_reloc = FALSE;
2540 }
2541 else
2542 {
2543 if (local_got_offsets == NULL)
2544 abort ();
2545
2546 off = local_got_offsets[r_symndx];
2547
2548 /* The offset must always be a multiple of 4. We use
2549 the least significant bit to record whether we have
2550 already generated the necessary reloc. */
2551 if ((off & 1) != 0)
2552 off &= ~1;
2553 else
2554 {
2555 bfd_put_32 (output_bfd, relocation,
2556 htab->elf.sgot->contents + off);
2557 local_got_offsets[r_symndx] |= 1;
2558
2559 if (bfd_link_pic (info))
2560 relative_reloc = TRUE;
2561 }
2562 }
2563
2564 if (relative_reloc)
2565 {
2566 asection *s;
2567 Elf_Internal_Rela outrel;
2568
2569 s = htab->elf.srelgot;
2570 if (s == NULL)
2571 abort ();
2572
2573 outrel.r_offset = (htab->elf.sgot->output_section->vma
2574 + htab->elf.sgot->output_offset
2575 + off);
2576 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2577 elf_append_rel (output_bfd, s, &outrel);
2578 }
2579
2580 if (off >= (bfd_vma) -2)
2581 abort ();
2582
2583 relocation = (htab->elf.sgot->output_section->vma
2584 + htab->elf.sgot->output_offset + off);
2585 if (rel->r_offset > 1
2586 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2587 && *(contents + rel->r_offset - 2) != 0x8d)
2588 {
2589 if (bfd_link_pic (info))
2590 {
2591 /* For PIC, disallow R_386_GOT32 without a base
2592 register, except for "lea foo@GOT, %reg", since
2593 we don't know what the GOT base is. */
2594 const char *name;
2595
2596 disallow_got32:
2597 if (h == NULL || h->root.root.string == NULL)
2598 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2599 NULL);
2600 else
2601 name = h->root.root.string;
2602
2603 _bfd_error_handler
2604 /* xgettext:c-format */
2605 (_("%B: direct GOT relocation %s against `%s'"
2606 " without base register can not be used"
2607 " when making a shared object"),
2608 input_bfd, howto->name, name);
2609 bfd_set_error (bfd_error_bad_value);
2610 return FALSE;
2611 }
2612 }
2613 else
2614 {
2615 /* Subtract the .got.plt section address only with a base
2616 register. */
2617 relocation -= (htab->elf.sgotplt->output_section->vma
2618 + htab->elf.sgotplt->output_offset);
2619 }
2620
2621 break;
2622
2623 case R_386_GOTOFF:
2624 /* Relocation is relative to the start of the global offset
2625 table. */
2626
2627 /* Check to make sure it isn't a protected function or data
2628 symbol for shared library since it may not be local when
2629 used as function address or with copy relocation. We also
2630 need to make sure that a symbol is referenced locally. */
2631 if (!bfd_link_executable (info) && h)
2632 {
2633 if (!h->def_regular)
2634 {
2635 const char *v;
2636
2637 switch (ELF_ST_VISIBILITY (h->other))
2638 {
2639 case STV_HIDDEN:
2640 v = _("hidden symbol");
2641 break;
2642 case STV_INTERNAL:
2643 v = _("internal symbol");
2644 break;
2645 case STV_PROTECTED:
2646 v = _("protected symbol");
2647 break;
2648 default:
2649 v = _("symbol");
2650 break;
2651 }
2652
2653 _bfd_error_handler
2654 /* xgettext:c-format */
2655 (_("%B: relocation R_386_GOTOFF against undefined %s"
2656 " `%s' can not be used when making a shared object"),
2657 input_bfd, v, h->root.root.string);
2658 bfd_set_error (bfd_error_bad_value);
2659 return FALSE;
2660 }
2661 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2662 && (h->type == STT_FUNC
2663 || h->type == STT_OBJECT)
2664 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2665 {
2666 _bfd_error_handler
2667 /* xgettext:c-format */
2668 (_("%B: relocation R_386_GOTOFF against protected %s"
2669 " `%s' can not be used when making a shared object"),
2670 input_bfd,
2671 h->type == STT_FUNC ? "function" : "data",
2672 h->root.root.string);
2673 bfd_set_error (bfd_error_bad_value);
2674 return FALSE;
2675 }
2676 }
2677
2678 /* Note that sgot is not involved in this
2679 calculation. We always want the start of .got.plt. If we
2680 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2681 permitted by the ABI, we might have to change this
2682 calculation. */
2683 relocation -= htab->elf.sgotplt->output_section->vma
2684 + htab->elf.sgotplt->output_offset;
2685 break;
2686
2687 case R_386_GOTPC:
2688 /* Use global offset table as symbol value. */
2689 relocation = htab->elf.sgotplt->output_section->vma
2690 + htab->elf.sgotplt->output_offset;
2691 unresolved_reloc = FALSE;
2692 break;
2693
2694 case R_386_PLT32:
2695 /* Relocation is to the entry for this symbol in the
2696 procedure linkage table. */
2697
2698 /* Resolve a PLT32 reloc against a local symbol directly,
2699 without using the procedure linkage table. */
2700 if (h == NULL)
2701 break;
2702
2703 if ((h->plt.offset == (bfd_vma) -1
2704 && eh->plt_got.offset == (bfd_vma) -1)
2705 || htab->elf.splt == NULL)
2706 {
2707 /* We didn't make a PLT entry for this symbol. This
2708 happens when statically linking PIC code, or when
2709 using -Bsymbolic. */
2710 break;
2711 }
2712
2713 if (h->plt.offset != (bfd_vma) -1)
2714 {
2715 if (htab->plt_second != NULL)
2716 {
2717 resolved_plt = htab->plt_second;
2718 plt_offset = eh->plt_second.offset;
2719 }
2720 else
2721 {
2722 resolved_plt = htab->elf.splt;
2723 plt_offset = h->plt.offset;
2724 }
2725 }
2726 else
2727 {
2728 resolved_plt = htab->plt_got;
2729 plt_offset = eh->plt_got.offset;
2730 }
2731
2732 relocation = (resolved_plt->output_section->vma
2733 + resolved_plt->output_offset
2734 + plt_offset);
2735 unresolved_reloc = FALSE;
2736 break;
2737
2738 case R_386_SIZE32:
2739 /* Set to symbol size. */
2740 relocation = st_size;
2741 /* Fall through. */
2742
2743 case R_386_32:
2744 case R_386_PC32:
2745 if ((input_section->flags & SEC_ALLOC) == 0
2746 || is_vxworks_tls)
2747 break;
2748
2749 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2750 FALSE, resolved_to_zero,
2751 (r_type == R_386_PC32)))
2752 {
2753 Elf_Internal_Rela outrel;
2754 bfd_boolean skip, relocate;
2755 asection *sreloc;
2756
2757 /* When generating a shared object, these relocations
2758 are copied into the output file to be resolved at run
2759 time. */
2760
2761 skip = FALSE;
2762 relocate = FALSE;
2763
2764 outrel.r_offset =
2765 _bfd_elf_section_offset (output_bfd, info, input_section,
2766 rel->r_offset);
2767 if (outrel.r_offset == (bfd_vma) -1)
2768 skip = TRUE;
2769 else if (outrel.r_offset == (bfd_vma) -2)
2770 skip = TRUE, relocate = TRUE;
2771 outrel.r_offset += (input_section->output_section->vma
2772 + input_section->output_offset);
2773
2774 if (skip)
2775 memset (&outrel, 0, sizeof outrel);
2776 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2777 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2778 else
2779 {
2780 /* This symbol is local, or marked to become local. */
2781 relocate = TRUE;
2782 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2783 }
2784
2785 sreloc = elf_section_data (input_section)->sreloc;
2786
2787 if (sreloc == NULL || sreloc->contents == NULL)
2788 {
2789 r = bfd_reloc_notsupported;
2790 goto check_relocation_error;
2791 }
2792
2793 elf_append_rel (output_bfd, sreloc, &outrel);
2794
2795 /* If this reloc is against an external symbol, we do
2796 not want to fiddle with the addend. Otherwise, we
2797 need to include the symbol value so that it becomes
2798 an addend for the dynamic reloc. */
2799 if (! relocate)
2800 continue;
2801 }
2802 break;
2803
2804 case R_386_TLS_IE:
2805 if (!bfd_link_executable (info))
2806 {
2807 Elf_Internal_Rela outrel;
2808 asection *sreloc;
2809
2810 outrel.r_offset = rel->r_offset
2811 + input_section->output_section->vma
2812 + input_section->output_offset;
2813 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2814 sreloc = elf_section_data (input_section)->sreloc;
2815 if (sreloc == NULL)
2816 abort ();
2817 elf_append_rel (output_bfd, sreloc, &outrel);
2818 }
2819 /* Fall through */
2820
2821 case R_386_TLS_GD:
2822 case R_386_TLS_GOTDESC:
2823 case R_386_TLS_DESC_CALL:
2824 case R_386_TLS_IE_32:
2825 case R_386_TLS_GOTIE:
2826 tls_type = GOT_UNKNOWN;
2827 if (h == NULL && local_got_offsets)
2828 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2829 else if (h != NULL)
2830 tls_type = elf_x86_hash_entry(h)->tls_type;
2831 if (tls_type == GOT_TLS_IE)
2832 tls_type = GOT_TLS_IE_NEG;
2833
2834 r_type_tls = r_type;
2835 if (! elf_i386_tls_transition (info, input_bfd,
2836 input_section, contents,
2837 symtab_hdr, sym_hashes,
2838 &r_type_tls, tls_type, rel,
2839 relend, h, r_symndx, TRUE))
2840 return FALSE;
2841
2842 if (r_type_tls == R_386_TLS_LE_32)
2843 {
2844 BFD_ASSERT (! unresolved_reloc);
2845 if (r_type == R_386_TLS_GD)
2846 {
2847 unsigned int type;
2848 bfd_vma roff;
2849
2850 /* GD->LE transition. */
2851 type = *(contents + rel->r_offset - 2);
2852 if (type == 0x04)
2853 {
2854 /* Change
2855 leal foo@tlsgd(,%ebx,1), %eax
2856 call ___tls_get_addr@PLT
2857 into:
2858 movl %gs:0, %eax
2859 subl $foo@tpoff, %eax
2860 (6 byte form of subl). */
2861 roff = rel->r_offset + 5;
2862 }
2863 else
2864 {
2865 /* Change
2866 leal foo@tlsgd(%ebx), %eax
2867 call ___tls_get_addr@PLT
2868 nop
2869 or
2870 leal foo@tlsgd(%reg), %eax
2871 call *___tls_get_addr@GOT(%reg)
2872 which may be converted to
2873 addr32 call ___tls_get_addr
2874 into:
2875 movl %gs:0, %eax; subl $foo@tpoff, %eax
2876 (6 byte form of subl). */
2877 roff = rel->r_offset + 6;
2878 }
2879 memcpy (contents + roff - 8,
2880 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2881 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2882 contents + roff);
2883 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2884 rel++;
2885 wrel++;
2886 continue;
2887 }
2888 else if (r_type == R_386_TLS_GOTDESC)
2889 {
2890 /* GDesc -> LE transition.
2891 It's originally something like:
2892 leal x@tlsdesc(%ebx), %eax
2893
2894 leal x@ntpoff, %eax
2895
2896 Registers other than %eax may be set up here. */
2897
2898 unsigned int val;
2899 bfd_vma roff;
2900
2901 roff = rel->r_offset;
2902 val = bfd_get_8 (input_bfd, contents + roff - 1);
2903
2904 /* Now modify the instruction as appropriate. */
2905 /* aoliva FIXME: remove the above and xor the byte
2906 below with 0x86. */
2907 bfd_put_8 (output_bfd, val ^ 0x86,
2908 contents + roff - 1);
2909 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2910 contents + roff);
2911 continue;
2912 }
2913 else if (r_type == R_386_TLS_DESC_CALL)
2914 {
2915 /* GDesc -> LE transition.
2916 It's originally:
2917 call *(%eax)
2918 Turn it into:
2919 xchg %ax,%ax */
2920
2921 bfd_vma roff;
2922
2923 roff = rel->r_offset;
2924 bfd_put_8 (output_bfd, 0x66, contents + roff);
2925 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2926 continue;
2927 }
2928 else if (r_type == R_386_TLS_IE)
2929 {
2930 unsigned int val;
2931
2932 /* IE->LE transition:
2933 Originally it can be one of:
2934 movl foo, %eax
2935 movl foo, %reg
2936 addl foo, %reg
2937 We change it into:
2938 movl $foo, %eax
2939 movl $foo, %reg
2940 addl $foo, %reg. */
2941 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2942 if (val == 0xa1)
2943 {
2944 /* movl foo, %eax. */
2945 bfd_put_8 (output_bfd, 0xb8,
2946 contents + rel->r_offset - 1);
2947 }
2948 else
2949 {
2950 unsigned int type;
2951
2952 type = bfd_get_8 (input_bfd,
2953 contents + rel->r_offset - 2);
2954 switch (type)
2955 {
2956 case 0x8b:
2957 /* movl */
2958 bfd_put_8 (output_bfd, 0xc7,
2959 contents + rel->r_offset - 2);
2960 bfd_put_8 (output_bfd,
2961 0xc0 | ((val >> 3) & 7),
2962 contents + rel->r_offset - 1);
2963 break;
2964 case 0x03:
2965 /* addl */
2966 bfd_put_8 (output_bfd, 0x81,
2967 contents + rel->r_offset - 2);
2968 bfd_put_8 (output_bfd,
2969 0xc0 | ((val >> 3) & 7),
2970 contents + rel->r_offset - 1);
2971 break;
2972 default:
2973 BFD_FAIL ();
2974 break;
2975 }
2976 }
2977 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2978 contents + rel->r_offset);
2979 continue;
2980 }
2981 else
2982 {
2983 unsigned int val, type;
2984
2985 /* {IE_32,GOTIE}->LE transition:
2986 Originally it can be one of:
2987 subl foo(%reg1), %reg2
2988 movl foo(%reg1), %reg2
2989 addl foo(%reg1), %reg2
2990 We change it into:
2991 subl $foo, %reg2
2992 movl $foo, %reg2 (6 byte form)
2993 addl $foo, %reg2. */
2994 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2995 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2996 if (type == 0x8b)
2997 {
2998 /* movl */
2999 bfd_put_8 (output_bfd, 0xc7,
3000 contents + rel->r_offset - 2);
3001 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3002 contents + rel->r_offset - 1);
3003 }
3004 else if (type == 0x2b)
3005 {
3006 /* subl */
3007 bfd_put_8 (output_bfd, 0x81,
3008 contents + rel->r_offset - 2);
3009 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3010 contents + rel->r_offset - 1);
3011 }
3012 else if (type == 0x03)
3013 {
3014 /* addl */
3015 bfd_put_8 (output_bfd, 0x81,
3016 contents + rel->r_offset - 2);
3017 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3018 contents + rel->r_offset - 1);
3019 }
3020 else
3021 BFD_FAIL ();
3022 if (r_type == R_386_TLS_GOTIE)
3023 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3024 contents + rel->r_offset);
3025 else
3026 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3027 contents + rel->r_offset);
3028 continue;
3029 }
3030 }
3031
3032 if (htab->elf.sgot == NULL)
3033 abort ();
3034
3035 if (h != NULL)
3036 {
3037 off = h->got.offset;
3038 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3039 }
3040 else
3041 {
3042 if (local_got_offsets == NULL)
3043 abort ();
3044
3045 off = local_got_offsets[r_symndx];
3046 offplt = local_tlsdesc_gotents[r_symndx];
3047 }
3048
3049 if ((off & 1) != 0)
3050 off &= ~1;
3051 else
3052 {
3053 Elf_Internal_Rela outrel;
3054 int dr_type;
3055 asection *sreloc;
3056
3057 if (htab->elf.srelgot == NULL)
3058 abort ();
3059
3060 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3061
3062 if (GOT_TLS_GDESC_P (tls_type))
3063 {
3064 bfd_byte *loc;
3065 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3066 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3067 <= htab->elf.sgotplt->size);
3068 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3069 + htab->elf.sgotplt->output_offset
3070 + offplt
3071 + htab->sgotplt_jump_table_size);
3072 sreloc = htab->elf.srelplt;
3073 loc = sreloc->contents;
3074 loc += (htab->next_tls_desc_index++
3075 * sizeof (Elf32_External_Rel));
3076 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3077 <= sreloc->contents + sreloc->size);
3078 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3079 if (indx == 0)
3080 {
3081 BFD_ASSERT (! unresolved_reloc);
3082 bfd_put_32 (output_bfd,
3083 relocation - _bfd_x86_elf_dtpoff_base (info),
3084 htab->elf.sgotplt->contents + offplt
3085 + htab->sgotplt_jump_table_size + 4);
3086 }
3087 else
3088 {
3089 bfd_put_32 (output_bfd, 0,
3090 htab->elf.sgotplt->contents + offplt
3091 + htab->sgotplt_jump_table_size + 4);
3092 }
3093 }
3094
3095 sreloc = htab->elf.srelgot;
3096
3097 outrel.r_offset = (htab->elf.sgot->output_section->vma
3098 + htab->elf.sgot->output_offset + off);
3099
3100 if (GOT_TLS_GD_P (tls_type))
3101 dr_type = R_386_TLS_DTPMOD32;
3102 else if (GOT_TLS_GDESC_P (tls_type))
3103 goto dr_done;
3104 else if (tls_type == GOT_TLS_IE_POS)
3105 dr_type = R_386_TLS_TPOFF;
3106 else
3107 dr_type = R_386_TLS_TPOFF32;
3108
3109 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3110 bfd_put_32 (output_bfd,
3111 relocation - _bfd_x86_elf_dtpoff_base (info),
3112 htab->elf.sgot->contents + off);
3113 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3114 bfd_put_32 (output_bfd,
3115 _bfd_x86_elf_dtpoff_base (info) - relocation,
3116 htab->elf.sgot->contents + off);
3117 else if (dr_type != R_386_TLS_DESC)
3118 bfd_put_32 (output_bfd, 0,
3119 htab->elf.sgot->contents + off);
3120 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3121
3122 elf_append_rel (output_bfd, sreloc, &outrel);
3123
3124 if (GOT_TLS_GD_P (tls_type))
3125 {
3126 if (indx == 0)
3127 {
3128 BFD_ASSERT (! unresolved_reloc);
3129 bfd_put_32 (output_bfd,
3130 relocation - _bfd_x86_elf_dtpoff_base (info),
3131 htab->elf.sgot->contents + off + 4);
3132 }
3133 else
3134 {
3135 bfd_put_32 (output_bfd, 0,
3136 htab->elf.sgot->contents + off + 4);
3137 outrel.r_info = ELF32_R_INFO (indx,
3138 R_386_TLS_DTPOFF32);
3139 outrel.r_offset += 4;
3140 elf_append_rel (output_bfd, sreloc, &outrel);
3141 }
3142 }
3143 else if (tls_type == GOT_TLS_IE_BOTH)
3144 {
3145 bfd_put_32 (output_bfd,
3146 (indx == 0
3147 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3148 : 0),
3149 htab->elf.sgot->contents + off + 4);
3150 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3151 outrel.r_offset += 4;
3152 elf_append_rel (output_bfd, sreloc, &outrel);
3153 }
3154
3155 dr_done:
3156 if (h != NULL)
3157 h->got.offset |= 1;
3158 else
3159 local_got_offsets[r_symndx] |= 1;
3160 }
3161
3162 if (off >= (bfd_vma) -2
3163 && ! GOT_TLS_GDESC_P (tls_type))
3164 abort ();
3165 if (r_type_tls == R_386_TLS_GOTDESC
3166 || r_type_tls == R_386_TLS_DESC_CALL)
3167 {
3168 relocation = htab->sgotplt_jump_table_size + offplt;
3169 unresolved_reloc = FALSE;
3170 }
3171 else if (r_type_tls == r_type)
3172 {
3173 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3174 + htab->elf.sgotplt->output_offset;
3175 relocation = htab->elf.sgot->output_section->vma
3176 + htab->elf.sgot->output_offset + off - g_o_t;
3177 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3178 && tls_type == GOT_TLS_IE_BOTH)
3179 relocation += 4;
3180 if (r_type == R_386_TLS_IE)
3181 relocation += g_o_t;
3182 unresolved_reloc = FALSE;
3183 }
3184 else if (r_type == R_386_TLS_GD)
3185 {
3186 unsigned int val, type;
3187 bfd_vma roff;
3188
3189 /* GD->IE transition. */
3190 type = *(contents + rel->r_offset - 2);
3191 val = *(contents + rel->r_offset - 1);
3192 if (type == 0x04)
3193 {
3194 /* Change
3195 leal foo@tlsgd(,%ebx,1), %eax
3196 call ___tls_get_addr@PLT
3197 into:
3198 movl %gs:0, %eax
3199 subl $foo@gottpoff(%ebx), %eax. */
3200 val >>= 3;
3201 roff = rel->r_offset - 3;
3202 }
3203 else
3204 {
3205 /* Change
3206 leal foo@tlsgd(%ebx), %eax
3207 call ___tls_get_addr@PLT
3208 nop
3209 or
3210 leal foo@tlsgd(%reg), %eax
3211 call *___tls_get_addr@GOT(%reg)
3212 which may be converted to
3213 addr32 call ___tls_get_addr
3214 into:
3215 movl %gs:0, %eax;
3216 subl $foo@gottpoff(%reg), %eax. */
3217 roff = rel->r_offset - 2;
3218 }
3219 memcpy (contents + roff,
3220 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3221 contents[roff + 7] = 0x80 | (val & 7);
3222 /* If foo is used only with foo@gotntpoff(%reg) and
3223 foo@indntpoff, but not with foo@gottpoff(%reg), change
3224 subl $foo@gottpoff(%reg), %eax
3225 into:
3226 addl $foo@gotntpoff(%reg), %eax. */
3227 if (tls_type == GOT_TLS_IE_POS)
3228 contents[roff + 6] = 0x03;
3229 bfd_put_32 (output_bfd,
3230 htab->elf.sgot->output_section->vma
3231 + htab->elf.sgot->output_offset + off
3232 - htab->elf.sgotplt->output_section->vma
3233 - htab->elf.sgotplt->output_offset,
3234 contents + roff + 8);
3235 /* Skip R_386_PLT32 and R_386_GOT32X. */
3236 rel++;
3237 wrel++;
3238 continue;
3239 }
3240 else if (r_type == R_386_TLS_GOTDESC)
3241 {
3242 /* GDesc -> IE transition.
3243 It's originally something like:
3244 leal x@tlsdesc(%ebx), %eax
3245
3246 Change it to:
3247 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3248 or:
3249 movl x@gottpoff(%ebx), %eax # before negl %eax
3250
3251 Registers other than %eax may be set up here. */
3252
3253 bfd_vma roff;
3254
3255 /* First, make sure it's a leal adding ebx to a 32-bit
3256 offset into any register, although it's probably
3257 almost always going to be eax. */
3258 roff = rel->r_offset;
3259
3260 /* Now modify the instruction as appropriate. */
3261 /* To turn a leal into a movl in the form we use it, it
3262 suffices to change the first byte from 0x8d to 0x8b.
3263 aoliva FIXME: should we decide to keep the leal, all
3264 we have to do is remove the statement below, and
3265 adjust the relaxation of R_386_TLS_DESC_CALL. */
3266 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3267
3268 if (tls_type == GOT_TLS_IE_BOTH)
3269 off += 4;
3270
3271 bfd_put_32 (output_bfd,
3272 htab->elf.sgot->output_section->vma
3273 + htab->elf.sgot->output_offset + off
3274 - htab->elf.sgotplt->output_section->vma
3275 - htab->elf.sgotplt->output_offset,
3276 contents + roff);
3277 continue;
3278 }
3279 else if (r_type == R_386_TLS_DESC_CALL)
3280 {
3281 /* GDesc -> IE transition.
3282 It's originally:
3283 call *(%eax)
3284
3285 Change it to:
3286 xchg %ax,%ax
3287 or
3288 negl %eax
3289 depending on how we transformed the TLS_GOTDESC above.
3290 */
3291
3292 bfd_vma roff;
3293
3294 roff = rel->r_offset;
3295
3296 /* Now modify the instruction as appropriate. */
3297 if (tls_type != GOT_TLS_IE_NEG)
3298 {
3299 /* xchg %ax,%ax */
3300 bfd_put_8 (output_bfd, 0x66, contents + roff);
3301 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3302 }
3303 else
3304 {
3305 /* negl %eax */
3306 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3307 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3308 }
3309
3310 continue;
3311 }
3312 else
3313 BFD_ASSERT (FALSE);
3314 break;
3315
3316 case R_386_TLS_LDM:
3317 if (! elf_i386_tls_transition (info, input_bfd,
3318 input_section, contents,
3319 symtab_hdr, sym_hashes,
3320 &r_type, GOT_UNKNOWN, rel,
3321 relend, h, r_symndx, TRUE))
3322 return FALSE;
3323
3324 if (r_type != R_386_TLS_LDM)
3325 {
3326 /* LD->LE transition. Change
3327 leal foo@tlsldm(%ebx) %eax
3328 call ___tls_get_addr@PLT
3329 into:
3330 movl %gs:0, %eax
3331 nop
3332 leal 0(%esi,1), %esi
3333 or change
3334 leal foo@tlsldm(%reg) %eax
3335 call *___tls_get_addr@GOT(%reg)
3336 which may be converted to
3337 addr32 call ___tls_get_addr
3338 into:
3339 movl %gs:0, %eax
3340 leal 0(%esi), %esi */
3341 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3342 if (*(contents + rel->r_offset + 4) == 0xff
3343 || *(contents + rel->r_offset + 4) == 0x67)
3344 memcpy (contents + rel->r_offset - 2,
3345 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3346 else
3347 memcpy (contents + rel->r_offset - 2,
3348 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3349 /* Skip R_386_PC32/R_386_PLT32. */
3350 rel++;
3351 wrel++;
3352 continue;
3353 }
3354
3355 if (htab->elf.sgot == NULL)
3356 abort ();
3357
3358 off = htab->tls_ld_or_ldm_got.offset;
3359 if (off & 1)
3360 off &= ~1;
3361 else
3362 {
3363 Elf_Internal_Rela outrel;
3364
3365 if (htab->elf.srelgot == NULL)
3366 abort ();
3367
3368 outrel.r_offset = (htab->elf.sgot->output_section->vma
3369 + htab->elf.sgot->output_offset + off);
3370
3371 bfd_put_32 (output_bfd, 0,
3372 htab->elf.sgot->contents + off);
3373 bfd_put_32 (output_bfd, 0,
3374 htab->elf.sgot->contents + off + 4);
3375 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3376 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3377 htab->tls_ld_or_ldm_got.offset |= 1;
3378 }
3379 relocation = htab->elf.sgot->output_section->vma
3380 + htab->elf.sgot->output_offset + off
3381 - htab->elf.sgotplt->output_section->vma
3382 - htab->elf.sgotplt->output_offset;
3383 unresolved_reloc = FALSE;
3384 break;
3385
3386 case R_386_TLS_LDO_32:
3387 if (!bfd_link_executable (info)
3388 || (input_section->flags & SEC_CODE) == 0)
3389 relocation -= _bfd_x86_elf_dtpoff_base (info);
3390 else
3391 /* When converting LDO to LE, we must negate. */
3392 relocation = -elf_i386_tpoff (info, relocation);
3393 break;
3394
3395 case R_386_TLS_LE_32:
3396 case R_386_TLS_LE:
3397 if (!bfd_link_executable (info))
3398 {
3399 Elf_Internal_Rela outrel;
3400 asection *sreloc;
3401
3402 outrel.r_offset = rel->r_offset
3403 + input_section->output_section->vma
3404 + input_section->output_offset;
3405 if (h != NULL && h->dynindx != -1)
3406 indx = h->dynindx;
3407 else
3408 indx = 0;
3409 if (r_type == R_386_TLS_LE_32)
3410 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3411 else
3412 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3413 sreloc = elf_section_data (input_section)->sreloc;
3414 if (sreloc == NULL)
3415 abort ();
3416 elf_append_rel (output_bfd, sreloc, &outrel);
3417 if (indx)
3418 continue;
3419 else if (r_type == R_386_TLS_LE_32)
3420 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3421 else
3422 relocation -= _bfd_x86_elf_dtpoff_base (info);
3423 }
3424 else if (r_type == R_386_TLS_LE_32)
3425 relocation = elf_i386_tpoff (info, relocation);
3426 else
3427 relocation = -elf_i386_tpoff (info, relocation);
3428 break;
3429
3430 default:
3431 break;
3432 }
3433
3434 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3435 because such sections are not SEC_ALLOC and thus ld.so will
3436 not process them. */
3437 if (unresolved_reloc
3438 && !((input_section->flags & SEC_DEBUGGING) != 0
3439 && h->def_dynamic)
3440 && _bfd_elf_section_offset (output_bfd, info, input_section,
3441 rel->r_offset) != (bfd_vma) -1)
3442 {
3443 _bfd_error_handler
3444 /* xgettext:c-format */
3445 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3446 input_bfd,
3447 input_section,
3448 rel->r_offset,
3449 howto->name,
3450 h->root.root.string);
3451 return FALSE;
3452 }
3453
3454 do_relocation:
3455 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3456 contents, rel->r_offset,
3457 relocation, 0);
3458
3459 check_relocation_error:
3460 if (r != bfd_reloc_ok)
3461 {
3462 const char *name;
3463
3464 if (h != NULL)
3465 name = h->root.root.string;
3466 else
3467 {
3468 name = bfd_elf_string_from_elf_section (input_bfd,
3469 symtab_hdr->sh_link,
3470 sym->st_name);
3471 if (name == NULL)
3472 return FALSE;
3473 if (*name == '\0')
3474 name = bfd_section_name (input_bfd, sec);
3475 }
3476
3477 if (r == bfd_reloc_overflow)
3478 (*info->callbacks->reloc_overflow)
3479 (info, (h ? &h->root : NULL), name, howto->name,
3480 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3481 else
3482 {
3483 _bfd_error_handler
3484 /* xgettext:c-format */
3485 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3486 input_bfd, input_section,
3487 rel->r_offset, name, (int) r);
3488 return FALSE;
3489 }
3490 }
3491
3492 if (wrel != rel)
3493 *wrel = *rel;
3494 }
3495
3496 if (wrel != rel)
3497 {
3498 Elf_Internal_Shdr *rel_hdr;
3499 size_t deleted = rel - wrel;
3500
3501 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3502 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3503 if (rel_hdr->sh_size == 0)
3504 {
3505 /* It is too late to remove an empty reloc section. Leave
3506 one NONE reloc.
3507 ??? What is wrong with an empty section??? */
3508 rel_hdr->sh_size = rel_hdr->sh_entsize;
3509 deleted -= 1;
3510 }
3511 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3512 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3513 input_section->reloc_count -= deleted;
3514 }
3515
3516 return TRUE;
3517 }
3518
3519 /* Finish up dynamic symbol handling. We set the contents of various
3520 dynamic sections here. */
3521
3522 static bfd_boolean
3523 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3524 struct bfd_link_info *info,
3525 struct elf_link_hash_entry *h,
3526 Elf_Internal_Sym *sym)
3527 {
3528 struct elf_x86_link_hash_table *htab;
3529 unsigned plt_entry_size;
3530 struct elf_x86_link_hash_entry *eh;
3531 bfd_boolean local_undefweak;
3532 bfd_boolean use_plt_second;
3533
3534 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3535 if (htab == NULL)
3536 return FALSE;
3537
3538 plt_entry_size = htab->plt.plt_entry_size;
3539
3540 /* Use the second PLT section only if there is .plt section. */
3541 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3542
3543 eh = (struct elf_x86_link_hash_entry *) h;
3544 if (eh->no_finish_dynamic_symbol)
3545 abort ();
3546
3547 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3548 resolved undefined weak symbols in executable so that their
3549 references have value 0 at run-time. */
3550 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3551
3552 if (h->plt.offset != (bfd_vma) -1)
3553 {
3554 bfd_vma plt_index, plt_offset;
3555 bfd_vma got_offset;
3556 Elf_Internal_Rela rel;
3557 bfd_byte *loc;
3558 asection *plt, *resolved_plt, *gotplt, *relplt;
3559
3560 /* When building a static executable, use .iplt, .igot.plt and
3561 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3562 if (htab->elf.splt != NULL)
3563 {
3564 plt = htab->elf.splt;
3565 gotplt = htab->elf.sgotplt;
3566 relplt = htab->elf.srelplt;
3567 }
3568 else
3569 {
3570 plt = htab->elf.iplt;
3571 gotplt = htab->elf.igotplt;
3572 relplt = htab->elf.irelplt;
3573 }
3574
3575 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3576
3577 /* Get the index in the procedure linkage table which
3578 corresponds to this symbol. This is the index of this symbol
3579 in all the symbols for which we are making plt entries. The
3580 first entry in the procedure linkage table is reserved.
3581
3582 Get the offset into the .got table of the entry that
3583 corresponds to this function. Each .got entry is 4 bytes.
3584 The first three are reserved.
3585
3586 For static executables, we don't reserve anything. */
3587
3588 if (plt == htab->elf.splt)
3589 {
3590 got_offset = (h->plt.offset / plt_entry_size
3591 - htab->plt.has_plt0);
3592 got_offset = (got_offset + 3) * 4;
3593 }
3594 else
3595 {
3596 got_offset = h->plt.offset / plt_entry_size;
3597 got_offset = got_offset * 4;
3598 }
3599
3600 /* Fill in the entry in the procedure linkage table and update
3601 the first slot. */
3602 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3603 plt_entry_size);
3604
3605 if (use_plt_second)
3606 {
3607 const bfd_byte *plt_entry;
3608 if (bfd_link_pic (info))
3609 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3610 else
3611 plt_entry = htab->non_lazy_plt->plt_entry;
3612 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3613 plt_entry, htab->non_lazy_plt->plt_entry_size);
3614
3615 resolved_plt = htab->plt_second;
3616 plt_offset = eh->plt_second.offset;
3617 }
3618 else
3619 {
3620 resolved_plt = plt;
3621 plt_offset = h->plt.offset;
3622 }
3623
3624 if (! bfd_link_pic (info))
3625 {
3626 bfd_put_32 (output_bfd,
3627 (gotplt->output_section->vma
3628 + gotplt->output_offset
3629 + got_offset),
3630 resolved_plt->contents + plt_offset
3631 + htab->plt.plt_got_offset);
3632
3633 if (htab->target_os == is_vxworks)
3634 {
3635 int s, k, reloc_index;
3636
3637 /* Create the R_386_32 relocation referencing the GOT
3638 for this PLT entry. */
3639
3640 /* S: Current slot number (zero-based). */
3641 s = ((h->plt.offset - htab->plt.plt_entry_size)
3642 / htab->plt.plt_entry_size);
3643 /* K: Number of relocations for PLTResolve. */
3644 if (bfd_link_pic (info))
3645 k = PLTRESOLVE_RELOCS_SHLIB;
3646 else
3647 k = PLTRESOLVE_RELOCS;
3648 /* Skip the PLTresolve relocations, and the relocations for
3649 the other PLT slots. */
3650 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3651 loc = (htab->srelplt2->contents + reloc_index
3652 * sizeof (Elf32_External_Rel));
3653
3654 rel.r_offset = (plt->output_section->vma
3655 + plt->output_offset
3656 + h->plt.offset + 2),
3657 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3658 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3659
3660 /* Create the R_386_32 relocation referencing the beginning of
3661 the PLT for this GOT entry. */
3662 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3663 + htab->elf.sgotplt->output_offset
3664 + got_offset);
3665 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3666 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3667 loc + sizeof (Elf32_External_Rel));
3668 }
3669 }
3670 else
3671 {
3672 bfd_put_32 (output_bfd, got_offset,
3673 resolved_plt->contents + plt_offset
3674 + htab->plt.plt_got_offset);
3675 }
3676
3677 /* Fill in the entry in the global offset table. Leave the entry
3678 as zero for undefined weak symbol in PIE. No PLT relocation
3679 against undefined weak symbol in PIE. */
3680 if (!local_undefweak)
3681 {
3682 if (htab->plt.has_plt0)
3683 bfd_put_32 (output_bfd,
3684 (plt->output_section->vma
3685 + plt->output_offset
3686 + h->plt.offset
3687 + htab->lazy_plt->plt_lazy_offset),
3688 gotplt->contents + got_offset);
3689
3690 /* Fill in the entry in the .rel.plt section. */
3691 rel.r_offset = (gotplt->output_section->vma
3692 + gotplt->output_offset
3693 + got_offset);
3694 if (PLT_LOCAL_IFUNC_P (info, h))
3695 {
3696 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3697 h->root.root.string,
3698 h->root.u.def.section->owner);
3699
3700 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3701 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3702 in the .got.plt section. */
3703 bfd_put_32 (output_bfd,
3704 (h->root.u.def.value
3705 + h->root.u.def.section->output_section->vma
3706 + h->root.u.def.section->output_offset),
3707 gotplt->contents + got_offset);
3708 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3709 /* R_386_IRELATIVE comes last. */
3710 plt_index = htab->next_irelative_index--;
3711 }
3712 else
3713 {
3714 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3715 plt_index = htab->next_jump_slot_index++;
3716 }
3717
3718 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3719 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3720
3721 /* Don't fill the second and third slots in PLT entry for
3722 static executables nor without PLT0. */
3723 if (plt == htab->elf.splt && htab->plt.has_plt0)
3724 {
3725 bfd_put_32 (output_bfd,
3726 plt_index * sizeof (Elf32_External_Rel),
3727 plt->contents + h->plt.offset
3728 + htab->lazy_plt->plt_reloc_offset);
3729 bfd_put_32 (output_bfd,
3730 - (h->plt.offset
3731 + htab->lazy_plt->plt_plt_offset + 4),
3732 (plt->contents + h->plt.offset
3733 + htab->lazy_plt->plt_plt_offset));
3734 }
3735 }
3736 }
3737 else if (eh->plt_got.offset != (bfd_vma) -1)
3738 {
3739 bfd_vma got_offset, plt_offset;
3740 asection *plt, *got, *gotplt;
3741 const bfd_byte *got_plt_entry;
3742
3743 /* Set the entry in the GOT procedure linkage table. */
3744 plt = htab->plt_got;
3745 got = htab->elf.sgot;
3746 gotplt = htab->elf.sgotplt;
3747 got_offset = h->got.offset;
3748
3749 if (got_offset == (bfd_vma) -1
3750 || plt == NULL
3751 || got == NULL
3752 || gotplt == NULL)
3753 abort ();
3754
3755 /* Fill in the entry in the GOT procedure linkage table. */
3756 if (! bfd_link_pic (info))
3757 {
3758 got_plt_entry = htab->non_lazy_plt->plt_entry;
3759 got_offset += got->output_section->vma + got->output_offset;
3760 }
3761 else
3762 {
3763 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3764 got_offset += (got->output_section->vma
3765 + got->output_offset
3766 - gotplt->output_section->vma
3767 - gotplt->output_offset);
3768 }
3769
3770 plt_offset = eh->plt_got.offset;
3771 memcpy (plt->contents + plt_offset, got_plt_entry,
3772 htab->non_lazy_plt->plt_entry_size);
3773 bfd_put_32 (output_bfd, got_offset,
3774 (plt->contents + plt_offset
3775 + htab->non_lazy_plt->plt_got_offset));
3776 }
3777
3778 if (!local_undefweak
3779 && !h->def_regular
3780 && (h->plt.offset != (bfd_vma) -1
3781 || eh->plt_got.offset != (bfd_vma) -1))
3782 {
3783 /* Mark the symbol as undefined, rather than as defined in
3784 the .plt section. Leave the value if there were any
3785 relocations where pointer equality matters (this is a clue
3786 for the dynamic linker, to make function pointer
3787 comparisons work between an application and shared
3788 library), otherwise set it to zero. If a function is only
3789 called from a binary, there is no need to slow down
3790 shared libraries because of that. */
3791 sym->st_shndx = SHN_UNDEF;
3792 if (!h->pointer_equality_needed)
3793 sym->st_value = 0;
3794 }
3795
3796 /* Don't generate dynamic GOT relocation against undefined weak
3797 symbol in executable. */
3798 if (h->got.offset != (bfd_vma) -1
3799 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3800 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3801 && !local_undefweak)
3802 {
3803 Elf_Internal_Rela rel;
3804 asection *relgot = htab->elf.srelgot;
3805
3806 /* This symbol has an entry in the global offset table. Set it
3807 up. */
3808
3809 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3810 abort ();
3811
3812 rel.r_offset = (htab->elf.sgot->output_section->vma
3813 + htab->elf.sgot->output_offset
3814 + (h->got.offset & ~(bfd_vma) 1));
3815
3816 /* If this is a static link, or it is a -Bsymbolic link and the
3817 symbol is defined locally or was forced to be local because
3818 of a version file, we just want to emit a RELATIVE reloc.
3819 The entry in the global offset table will already have been
3820 initialized in the relocate_section function. */
3821 if (h->def_regular
3822 && h->type == STT_GNU_IFUNC)
3823 {
3824 if (h->plt.offset == (bfd_vma) -1)
3825 {
3826 /* STT_GNU_IFUNC is referenced without PLT. */
3827 if (htab->elf.splt == NULL)
3828 {
3829 /* use .rel[a].iplt section to store .got relocations
3830 in static executable. */
3831 relgot = htab->elf.irelplt;
3832 }
3833 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3834 {
3835 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3836 h->root.root.string,
3837 h->root.u.def.section->owner);
3838
3839 bfd_put_32 (output_bfd,
3840 (h->root.u.def.value
3841 + h->root.u.def.section->output_section->vma
3842 + h->root.u.def.section->output_offset),
3843 htab->elf.sgot->contents + h->got.offset);
3844 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3845 }
3846 else
3847 goto do_glob_dat;
3848 }
3849 else if (bfd_link_pic (info))
3850 {
3851 /* Generate R_386_GLOB_DAT. */
3852 goto do_glob_dat;
3853 }
3854 else
3855 {
3856 asection *plt;
3857 bfd_vma plt_offset;
3858
3859 if (!h->pointer_equality_needed)
3860 abort ();
3861
3862 /* For non-shared object, we can't use .got.plt, which
3863 contains the real function addres if we need pointer
3864 equality. We load the GOT entry with the PLT entry. */
3865 if (htab->plt_second != NULL)
3866 {
3867 plt = htab->plt_second;
3868 plt_offset = eh->plt_second.offset;
3869 }
3870 else
3871 {
3872 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3873 plt_offset = h->plt.offset;
3874 }
3875 bfd_put_32 (output_bfd,
3876 (plt->output_section->vma
3877 + plt->output_offset + plt_offset),
3878 htab->elf.sgot->contents + h->got.offset);
3879 return TRUE;
3880 }
3881 }
3882 else if (bfd_link_pic (info)
3883 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3884 {
3885 BFD_ASSERT((h->got.offset & 1) != 0);
3886 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3887 }
3888 else
3889 {
3890 BFD_ASSERT((h->got.offset & 1) == 0);
3891 do_glob_dat:
3892 bfd_put_32 (output_bfd, (bfd_vma) 0,
3893 htab->elf.sgot->contents + h->got.offset);
3894 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3895 }
3896
3897 elf_append_rel (output_bfd, relgot, &rel);
3898 }
3899
3900 if (h->needs_copy)
3901 {
3902 Elf_Internal_Rela rel;
3903 asection *s;
3904
3905 /* This symbol needs a copy reloc. Set it up. */
3906 VERIFY_COPY_RELOC (h, htab)
3907
3908 rel.r_offset = (h->root.u.def.value
3909 + h->root.u.def.section->output_section->vma
3910 + h->root.u.def.section->output_offset);
3911 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3912 if (h->root.u.def.section == htab->elf.sdynrelro)
3913 s = htab->elf.sreldynrelro;
3914 else
3915 s = htab->elf.srelbss;
3916 elf_append_rel (output_bfd, s, &rel);
3917 }
3918
3919 return TRUE;
3920 }
3921
3922 /* Finish up local dynamic symbol handling. We set the contents of
3923 various dynamic sections here. */
3924
3925 static bfd_boolean
3926 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3927 {
3928 struct elf_link_hash_entry *h
3929 = (struct elf_link_hash_entry *) *slot;
3930 struct bfd_link_info *info
3931 = (struct bfd_link_info *) inf;
3932
3933 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3934 h, NULL);
3935 }
3936
3937 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3938 here since undefined weak symbol may not be dynamic and may not be
3939 called for elf_i386_finish_dynamic_symbol. */
3940
3941 static bfd_boolean
3942 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3943 void *inf)
3944 {
3945 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3946 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3947
3948 if (h->root.type != bfd_link_hash_undefweak
3949 || h->dynindx != -1)
3950 return TRUE;
3951
3952 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3953 info, h, NULL);
3954 }
3955
3956 /* Used to decide how to sort relocs in an optimal manner for the
3957 dynamic linker, before writing them out. */
3958
3959 static enum elf_reloc_type_class
3960 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3961 const asection *rel_sec ATTRIBUTE_UNUSED,
3962 const Elf_Internal_Rela *rela)
3963 {
3964 bfd *abfd = info->output_bfd;
3965 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3966 struct elf_link_hash_table *htab = elf_hash_table (info);
3967
3968 if (htab->dynsym != NULL
3969 && htab->dynsym->contents != NULL)
3970 {
3971 /* Check relocation against STT_GNU_IFUNC symbol if there are
3972 dynamic symbols. */
3973 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3974 if (r_symndx != STN_UNDEF)
3975 {
3976 Elf_Internal_Sym sym;
3977 if (!bed->s->swap_symbol_in (abfd,
3978 (htab->dynsym->contents
3979 + r_symndx * sizeof (Elf32_External_Sym)),
3980 0, &sym))
3981 abort ();
3982
3983 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3984 return reloc_class_ifunc;
3985 }
3986 }
3987
3988 switch (ELF32_R_TYPE (rela->r_info))
3989 {
3990 case R_386_IRELATIVE:
3991 return reloc_class_ifunc;
3992 case R_386_RELATIVE:
3993 return reloc_class_relative;
3994 case R_386_JUMP_SLOT:
3995 return reloc_class_plt;
3996 case R_386_COPY:
3997 return reloc_class_copy;
3998 default:
3999 return reloc_class_normal;
4000 }
4001 }
4002
4003 /* Finish up the dynamic sections. */
4004
4005 static bfd_boolean
4006 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4007 struct bfd_link_info *info)
4008 {
4009 struct elf_x86_link_hash_table *htab;
4010
4011 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4012 if (htab == NULL)
4013 return FALSE;
4014
4015 if (!htab->elf.dynamic_sections_created)
4016 return TRUE;
4017
4018 if (htab->elf.splt && htab->elf.splt->size > 0)
4019 {
4020 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4021 really seem like the right value. */
4022 elf_section_data (htab->elf.splt->output_section)
4023 ->this_hdr.sh_entsize = 4;
4024
4025 if (htab->plt.has_plt0)
4026 {
4027 /* Fill in the special first entry in the procedure linkage
4028 table. */
4029 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4030 htab->lazy_plt->plt0_entry_size);
4031 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4032 htab->plt0_pad_byte,
4033 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4034 if (!bfd_link_pic (info))
4035 {
4036 bfd_put_32 (output_bfd,
4037 (htab->elf.sgotplt->output_section->vma
4038 + htab->elf.sgotplt->output_offset
4039 + 4),
4040 htab->elf.splt->contents
4041 + htab->lazy_plt->plt0_got1_offset);
4042 bfd_put_32 (output_bfd,
4043 (htab->elf.sgotplt->output_section->vma
4044 + htab->elf.sgotplt->output_offset
4045 + 8),
4046 htab->elf.splt->contents
4047 + htab->lazy_plt->plt0_got2_offset);
4048
4049 if (htab->target_os == is_vxworks)
4050 {
4051 Elf_Internal_Rela rel;
4052 int num_plts = (htab->elf.splt->size
4053 / htab->plt.plt_entry_size) - 1;
4054 unsigned char *p;
4055 asection *srelplt2 = htab->srelplt2;
4056
4057 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4058 + 4. On IA32 we use REL relocations so the
4059 addend goes in the PLT directly. */
4060 rel.r_offset = (htab->elf.splt->output_section->vma
4061 + htab->elf.splt->output_offset
4062 + htab->lazy_plt->plt0_got1_offset);
4063 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4064 R_386_32);
4065 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4066 srelplt2->contents);
4067 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4068 + 8. */
4069 rel.r_offset = (htab->elf.splt->output_section->vma
4070 + htab->elf.splt->output_offset
4071 + htab->lazy_plt->plt0_got2_offset);
4072 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4073 R_386_32);
4074 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4075 srelplt2->contents +
4076 sizeof (Elf32_External_Rel));
4077 /* Correct the .rel.plt.unloaded relocations. */
4078 p = srelplt2->contents;
4079 if (bfd_link_pic (info))
4080 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4081 else
4082 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4083
4084 for (; num_plts; num_plts--)
4085 {
4086 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4087 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4088 R_386_32);
4089 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4090 p += sizeof (Elf32_External_Rel);
4091
4092 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4093 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4094 R_386_32);
4095 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4096 p += sizeof (Elf32_External_Rel);
4097 }
4098 }
4099 }
4100 }
4101 }
4102
4103 /* Fill PLT entries for undefined weak symbols in PIE. */
4104 if (bfd_link_pie (info))
4105 bfd_hash_traverse (&info->hash->table,
4106 elf_i386_pie_finish_undefweak_symbol,
4107 info);
4108
4109 return TRUE;
4110 }
4111
4112 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4113 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4114 It has to be done before elf_link_sort_relocs is called so that
4115 dynamic relocations are properly sorted. */
4116
4117 static bfd_boolean
4118 elf_i386_output_arch_local_syms
4119 (bfd *output_bfd ATTRIBUTE_UNUSED,
4120 struct bfd_link_info *info,
4121 void *flaginfo ATTRIBUTE_UNUSED,
4122 int (*func) (void *, const char *,
4123 Elf_Internal_Sym *,
4124 asection *,
4125 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4126 {
4127 struct elf_x86_link_hash_table *htab
4128 = elf_x86_hash_table (info, I386_ELF_DATA);
4129 if (htab == NULL)
4130 return FALSE;
4131
4132 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4133 htab_traverse (htab->loc_hash_table,
4134 elf_i386_finish_local_dynamic_symbol,
4135 info);
4136
4137 return TRUE;
4138 }
4139
4140 /* Forward declaration. */
4141 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4142
4143 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4144 dynamic relocations. */
4145
4146 static long
4147 elf_i386_get_synthetic_symtab (bfd *abfd,
4148 long symcount ATTRIBUTE_UNUSED,
4149 asymbol **syms ATTRIBUTE_UNUSED,
4150 long dynsymcount,
4151 asymbol **dynsyms,
4152 asymbol **ret)
4153 {
4154 long count, i, n;
4155 int j;
4156 bfd_byte *plt_contents;
4157 long relsize;
4158 const struct elf_x86_lazy_plt_layout *lazy_plt;
4159 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4160 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4161 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4162 asection *plt;
4163 bfd_vma got_addr;
4164 enum elf_x86_plt_type plt_type;
4165 struct elf_x86_plt plts[] =
4166 {
4167 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4168 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4169 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4170 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4171 };
4172
4173 *ret = NULL;
4174
4175 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4176 return 0;
4177
4178 if (dynsymcount <= 0)
4179 return 0;
4180
4181 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4182 if (relsize <= 0)
4183 return -1;
4184
4185 non_lazy_plt = NULL;
4186 /* Silence GCC 6. */
4187 lazy_plt = NULL;
4188 non_lazy_ibt_plt = NULL;
4189 lazy_ibt_plt = NULL;
4190 switch (get_elf_x86_backend_data (abfd)->target_os)
4191 {
4192 case is_normal:
4193 non_lazy_plt = &elf_i386_non_lazy_plt;
4194 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4195 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4196 /* Fall through */
4197 case is_vxworks:
4198 lazy_plt = &elf_i386_lazy_plt;
4199 break;
4200 case is_nacl:
4201 lazy_plt = &elf_i386_nacl_plt;
4202 break;
4203 }
4204
4205 got_addr = 0;
4206
4207 count = 0;
4208 for (j = 0; plts[j].name != NULL; j++)
4209 {
4210 plt = bfd_get_section_by_name (abfd, plts[j].name);
4211 if (plt == NULL || plt->size == 0)
4212 continue;
4213
4214 /* Get the PLT section contents. */
4215 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4216 if (plt_contents == NULL)
4217 break;
4218 if (!bfd_get_section_contents (abfd, (asection *) plt,
4219 plt_contents, 0, plt->size))
4220 {
4221 free (plt_contents);
4222 break;
4223 }
4224
4225 /* Check what kind of PLT it is. */
4226 plt_type = plt_unknown;
4227 if (plts[j].type == plt_unknown
4228 && (plt->size >= (lazy_plt->plt0_entry_size
4229 + lazy_plt->plt_entry_size)))
4230 {
4231 /* Match lazy PLT first. */
4232 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4233 lazy_plt->plt0_got1_offset) == 0)
4234 {
4235 /* The fist entry in the lazy IBT PLT is the same as the
4236 normal lazy PLT. */
4237 if (lazy_ibt_plt != NULL
4238 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4239 lazy_ibt_plt->plt_entry,
4240 lazy_ibt_plt->plt_got_offset) == 0))
4241 plt_type = plt_lazy | plt_second;
4242 else
4243 plt_type = plt_lazy;
4244 }
4245 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4246 lazy_plt->plt0_got1_offset) == 0)
4247 {
4248 /* The fist entry in the PIC lazy IBT PLT is the same as
4249 the normal PIC lazy PLT. */
4250 if (lazy_ibt_plt != NULL
4251 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4252 lazy_ibt_plt->pic_plt_entry,
4253 lazy_ibt_plt->plt_got_offset) == 0))
4254 plt_type = plt_lazy | plt_pic | plt_second;
4255 else
4256 plt_type = plt_lazy | plt_pic;
4257 }
4258 }
4259
4260 if (non_lazy_plt != NULL
4261 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4262 && plt->size >= non_lazy_plt->plt_entry_size)
4263 {
4264 /* Match non-lazy PLT. */
4265 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4266 non_lazy_plt->plt_got_offset) == 0)
4267 plt_type = plt_non_lazy;
4268 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4269 non_lazy_plt->plt_got_offset) == 0)
4270 plt_type = plt_pic;
4271 }
4272
4273 if ((non_lazy_ibt_plt != NULL)
4274 && (plt_type == plt_unknown || plt_type == plt_second)
4275 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4276 {
4277 if (memcmp (plt_contents,
4278 non_lazy_ibt_plt->plt_entry,
4279 non_lazy_ibt_plt->plt_got_offset) == 0)
4280 {
4281 /* Match IBT PLT. */
4282 plt_type = plt_second;
4283 non_lazy_plt = non_lazy_ibt_plt;
4284 }
4285 else if (memcmp (plt_contents,
4286 non_lazy_ibt_plt->pic_plt_entry,
4287 non_lazy_ibt_plt->plt_got_offset) == 0)
4288 {
4289 /* Match PIC IBT PLT. */
4290 plt_type = plt_second | plt_pic;
4291 non_lazy_plt = non_lazy_ibt_plt;
4292 }
4293 }
4294
4295 if (plt_type == plt_unknown)
4296 {
4297 free (plt_contents);
4298 continue;
4299 }
4300
4301 plts[j].sec = plt;
4302 plts[j].type = plt_type;
4303
4304 if ((plt_type & plt_lazy))
4305 {
4306 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4307 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4308 /* Skip PLT0 in lazy PLT. */
4309 i = 1;
4310 }
4311 else
4312 {
4313 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4314 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4315 i = 0;
4316 }
4317
4318 /* Skip lazy PLT when the second PLT is used. */
4319 if ((plt_type & (plt_lazy | plt_second))
4320 == (plt_lazy | plt_second))
4321 plts[j].count = 0;
4322 else
4323 {
4324 n = plt->size / plts[j].plt_entry_size;
4325 plts[j].count = n;
4326 count += n - i;
4327 }
4328
4329 plts[j].contents = plt_contents;
4330
4331 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4332 if ((plt_type & plt_pic))
4333 got_addr = (bfd_vma) -1;
4334 }
4335
4336 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4337 got_addr, plts, dynsyms,
4338 ret);
4339 }
4340
4341 /* Set up i386 GNU properties. Return the first relocatable ELF input
4342 with GNU properties if found. Otherwise, return NULL. */
4343
4344 static bfd *
4345 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4346 {
4347 struct elf_x86_init_table init_table;
4348
4349 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4350 {
4351 case is_normal:
4352 init_table.plt0_pad_byte = 0x0;
4353 init_table.lazy_plt = &elf_i386_lazy_plt;
4354 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4355 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4356 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4357 break;
4358 case is_vxworks:
4359 init_table.plt0_pad_byte = 0x90;
4360 init_table.lazy_plt = &elf_i386_lazy_plt;
4361 init_table.non_lazy_plt = NULL;
4362 init_table.lazy_ibt_plt = NULL;
4363 init_table.non_lazy_ibt_plt = NULL;
4364 break;
4365 case is_nacl:
4366 init_table.plt0_pad_byte = 0x90;
4367 init_table.lazy_plt = &elf_i386_nacl_plt;
4368 init_table.non_lazy_plt = NULL;
4369 init_table.lazy_ibt_plt = NULL;
4370 init_table.non_lazy_ibt_plt = NULL;
4371 break;
4372 }
4373
4374 init_table.r_info = elf32_r_info;
4375 init_table.r_sym = elf32_r_sym;
4376
4377 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4378 }
4379
4380 #define TARGET_LITTLE_SYM i386_elf32_vec
4381 #define TARGET_LITTLE_NAME "elf32-i386"
4382 #define ELF_ARCH bfd_arch_i386
4383 #define ELF_TARGET_ID I386_ELF_DATA
4384 #define ELF_MACHINE_CODE EM_386
4385 #define ELF_MAXPAGESIZE 0x1000
4386
4387 #define elf_backend_can_gc_sections 1
4388 #define elf_backend_can_refcount 1
4389 #define elf_backend_want_got_plt 1
4390 #define elf_backend_plt_readonly 1
4391 #define elf_backend_want_plt_sym 0
4392 #define elf_backend_got_header_size 12
4393 #define elf_backend_plt_alignment 4
4394 #define elf_backend_dtrel_excludes_plt 1
4395 #define elf_backend_extern_protected_data 1
4396 #define elf_backend_caches_rawsize 1
4397 #define elf_backend_want_dynrelro 1
4398
4399 /* Support RELA for objdump of prelink objects. */
4400 #define elf_info_to_howto elf_i386_info_to_howto_rel
4401 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4402
4403 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4404 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4405 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4406 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4407
4408 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4409 #define elf_backend_check_relocs elf_i386_check_relocs
4410 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4411 #define elf_backend_fake_sections elf_i386_fake_sections
4412 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4413 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4414 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4415 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4416 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4417 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4418 #define elf_backend_relocate_section elf_i386_relocate_section
4419 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4420 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4421
4422 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4423
4424 #include "elf32-target.h"
4425
4426 /* FreeBSD support. */
4427
4428 #undef TARGET_LITTLE_SYM
4429 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4430 #undef TARGET_LITTLE_NAME
4431 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4432 #undef ELF_OSABI
4433 #define ELF_OSABI ELFOSABI_FREEBSD
4434
4435 /* The kernel recognizes executables as valid only if they carry a
4436 "FreeBSD" label in the ELF header. So we put this label on all
4437 executables and (for simplicity) also all other object files. */
4438
4439 static void
4440 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4441 {
4442 _bfd_elf_post_process_headers (abfd, info);
4443
4444 #ifdef OLD_FREEBSD_ABI_LABEL
4445 {
4446 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4447 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4448 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4449 }
4450 #endif
4451 }
4452
4453 #undef elf_backend_post_process_headers
4454 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4455 #undef elf32_bed
4456 #define elf32_bed elf32_i386_fbsd_bed
4457
4458 #undef elf_backend_add_symbol_hook
4459
4460 #include "elf32-target.h"
4461
4462 /* Solaris 2. */
4463
4464 #undef TARGET_LITTLE_SYM
4465 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4466 #undef TARGET_LITTLE_NAME
4467 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4468
4469 #undef elf_backend_post_process_headers
4470
4471 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4472 objects won't be recognized. */
4473 #undef ELF_OSABI
4474
4475 #undef elf32_bed
4476 #define elf32_bed elf32_i386_sol2_bed
4477
4478 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4479 boundary. */
4480 #undef elf_backend_static_tls_alignment
4481 #define elf_backend_static_tls_alignment 8
4482
4483 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4484
4485 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4486 File, p.63. */
4487 #undef elf_backend_want_plt_sym
4488 #define elf_backend_want_plt_sym 1
4489
4490 #undef elf_backend_strtab_flags
4491 #define elf_backend_strtab_flags SHF_STRINGS
4492
4493 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4494 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4495 FALSE otherwise. ISECTION is the best guess matching section from the
4496 input bfd IBFD, but it might be NULL. */
4497
4498 static bfd_boolean
4499 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4500 bfd *obfd ATTRIBUTE_UNUSED,
4501 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4502 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4503 {
4504 /* PR 19938: FIXME: Need to add code for setting the sh_info
4505 and sh_link fields of Solaris specific section types. */
4506 return FALSE;
4507
4508 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4509 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4510
4511 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4512
4513 The following values should be set:
4514
4515 Type Link Info
4516 -----------------------------------------------------------------------------
4517 SHT_SUNW_ancillary The section header index of 0
4518 [0x6fffffee] the associated string table.
4519
4520 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4521 [0x6ffffff0] the associated symbol table. section header index of
4522 the associated
4523 SHT_SUNW_capchain table,
4524 otherwise 0.
4525
4526 SHT_SUNW_symsort The section header index of 0
4527 [0x6ffffff1] the associated symbol table.
4528
4529 SHT_SUNW_tlssort The section header index of 0
4530 [0x6ffffff2] the associated symbol table.
4531
4532 SHT_SUNW_LDYNSYM The section header index of One greater than the
4533 [0x6ffffff3] the associated string table. symbol table index of the
4534 This index is the same string last local symbol,
4535 table used by the SHT_DYNSYM STB_LOCAL. Since
4536 section. SHT_SUNW_LDYNSYM only
4537 contains local symbols,
4538 sh_info is equivalent to
4539 the number of symbols in
4540 the table.
4541
4542 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4543 [0x6ffffff5] the section header index of to named strings, the
4544 the associated section header index of
4545 SHT_SUNW_capinfo table, the associated string
4546 otherwise 0. table, otherwise 0.
4547
4548 SHT_SUNW_move The section header index of 0
4549 [0x6ffffffa] the associated symbol table.
4550
4551 SHT_SUNW_COMDAT 0 0
4552 [0x6ffffffb]
4553
4554 SHT_SUNW_syminfo The section header index of The section header index
4555 [0x6ffffffc] the associated symbol table. of the associated
4556 .dynamic section.
4557
4558 SHT_SUNW_verdef The section header index of The number of version
4559 [0x6ffffffd] the associated string table. definitions within the
4560 section.
4561
4562 SHT_SUNW_verneed The section header index of The number of version
4563 [0x6ffffffe] the associated string table. dependencies within the
4564 section.
4565
4566 SHT_SUNW_versym The section header index of 0
4567 [0x6fffffff] the associated symbol table. */
4568 }
4569
4570 #undef elf_backend_copy_special_section_fields
4571 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4572
4573 #include "elf32-target.h"
4574
4575 /* Intel MCU support. */
4576
4577 static bfd_boolean
4578 elf32_iamcu_elf_object_p (bfd *abfd)
4579 {
4580 /* Set the right machine number for an IAMCU elf32 file. */
4581 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4582 return TRUE;
4583 }
4584
4585 #undef TARGET_LITTLE_SYM
4586 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4587 #undef TARGET_LITTLE_NAME
4588 #define TARGET_LITTLE_NAME "elf32-iamcu"
4589 #undef ELF_ARCH
4590 #define ELF_ARCH bfd_arch_iamcu
4591
4592 #undef ELF_MACHINE_CODE
4593 #define ELF_MACHINE_CODE EM_IAMCU
4594
4595 #undef ELF_OSABI
4596
4597 #undef elf32_bed
4598 #define elf32_bed elf32_iamcu_bed
4599
4600 #undef elf_backend_object_p
4601 #define elf_backend_object_p elf32_iamcu_elf_object_p
4602
4603 #undef elf_backend_static_tls_alignment
4604
4605 #undef elf_backend_want_plt_sym
4606 #define elf_backend_want_plt_sym 0
4607
4608 #undef elf_backend_strtab_flags
4609 #undef elf_backend_copy_special_section_fields
4610
4611 #include "elf32-target.h"
4612
4613 /* Restore defaults. */
4614 #undef ELF_ARCH
4615 #define ELF_ARCH bfd_arch_i386
4616 #undef ELF_MACHINE_CODE
4617 #define ELF_MACHINE_CODE EM_386
4618
4619 /* Native Client support. */
4620
4621 #undef TARGET_LITTLE_SYM
4622 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4623 #undef TARGET_LITTLE_NAME
4624 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4625 #undef elf32_bed
4626 #define elf32_bed elf32_i386_nacl_bed
4627
4628 #undef ELF_MAXPAGESIZE
4629 #define ELF_MAXPAGESIZE 0x10000
4630
4631 /* Restore defaults. */
4632 #undef ELF_OSABI
4633 #undef elf_backend_want_plt_sym
4634 #define elf_backend_want_plt_sym 0
4635 #undef elf_backend_post_process_headers
4636 #undef elf_backend_static_tls_alignment
4637
4638 /* NaCl uses substantially different PLT entries for the same effects. */
4639
4640 #undef elf_backend_plt_alignment
4641 #define elf_backend_plt_alignment 5
4642 #define NACL_PLT_ENTRY_SIZE 64
4643 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4644
4645 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4646 {
4647 0xff, 0x35, /* pushl contents of address */
4648 0, 0, 0, 0, /* replaced with address of .got + 4. */
4649 0x8b, 0x0d, /* movl contents of address, %ecx */
4650 0, 0, 0, 0, /* replaced with address of .got + 8. */
4651 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4652 0xff, 0xe1 /* jmp *%ecx */
4653 };
4654
4655 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4656 {
4657 0x8b, 0x0d, /* movl contents of address, %ecx */
4658 0, 0, 0, 0, /* replaced with GOT slot address. */
4659 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4660 0xff, 0xe1, /* jmp *%ecx */
4661
4662 /* Pad to the next 32-byte boundary with nop instructions. */
4663 0x90,
4664 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4665 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4666
4667 /* Lazy GOT entries point here (32-byte aligned). */
4668 0x68, /* pushl immediate */
4669 0, 0, 0, 0, /* replaced with reloc offset. */
4670 0xe9, /* jmp relative */
4671 0, 0, 0, 0, /* replaced with offset to .plt. */
4672
4673 /* Pad to the next 32-byte boundary with nop instructions. */
4674 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4675 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4676 0x90, 0x90
4677 };
4678
4679 static const bfd_byte
4680 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4681 {
4682 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4683 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4684 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4685 0xff, 0xe1, /* jmp *%ecx */
4686
4687 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4688 so pad to that size with nop instructions. */
4689 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4690 };
4691
4692 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4693 {
4694 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4695 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4696 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4697 0xff, 0xe1, /* jmp *%ecx */
4698
4699 /* Pad to the next 32-byte boundary with nop instructions. */
4700 0x90,
4701 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4702 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4703
4704 /* Lazy GOT entries point here (32-byte aligned). */
4705 0x68, /* pushl immediate */
4706 0, 0, 0, 0, /* replaced with offset into relocation table. */
4707 0xe9, /* jmp relative */
4708 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4709
4710 /* Pad to the next 32-byte boundary with nop instructions. */
4711 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4712 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4713 0x90, 0x90
4714 };
4715
4716 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4717 {
4718 #if (PLT_CIE_LENGTH != 20 \
4719 || PLT_FDE_LENGTH != 36 \
4720 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4721 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4722 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4723 #endif
4724 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4725 0, 0, 0, 0, /* CIE ID */
4726 1, /* CIE version */
4727 'z', 'R', 0, /* Augmentation string */
4728 1, /* Code alignment factor */
4729 0x7c, /* Data alignment factor: -4 */
4730 8, /* Return address column */
4731 1, /* Augmentation size */
4732 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4733 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4734 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4735 DW_CFA_nop, DW_CFA_nop,
4736
4737 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4738 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4739 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4740 0, 0, 0, 0, /* .plt size goes here */
4741 0, /* Augmentation size */
4742 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4743 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4744 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4745 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4746 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4747 13, /* Block length */
4748 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4749 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4750 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4751 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4752 DW_CFA_nop, DW_CFA_nop
4753 };
4754
4755 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4756 {
4757 elf_i386_nacl_plt0_entry, /* plt0_entry */
4758 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4759 elf_i386_nacl_plt_entry, /* plt_entry */
4760 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4761 2, /* plt0_got1_offset */
4762 8, /* plt0_got2_offset */
4763 0, /* plt0_got2_insn_end */
4764 2, /* plt_got_offset */
4765 33, /* plt_reloc_offset */
4766 38, /* plt_plt_offset */
4767 0, /* plt_got_insn_size */
4768 0, /* plt_plt_insn_end */
4769 32, /* plt_lazy_offset */
4770 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4771 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4772 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4773 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4774 };
4775
4776 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4777 {
4778 is_nacl /* os */
4779 };
4780
4781 static bfd_boolean
4782 elf32_i386_nacl_elf_object_p (bfd *abfd)
4783 {
4784 /* Set the right machine number for a NaCl i386 ELF32 file. */
4785 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4786 return TRUE;
4787 }
4788
4789 #undef elf_backend_arch_data
4790 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4791
4792 #undef elf_backend_object_p
4793 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4794 #undef elf_backend_modify_segment_map
4795 #define elf_backend_modify_segment_map nacl_modify_segment_map
4796 #undef elf_backend_modify_program_headers
4797 #define elf_backend_modify_program_headers nacl_modify_program_headers
4798 #undef elf_backend_final_write_processing
4799 #define elf_backend_final_write_processing nacl_final_write_processing
4800
4801 #include "elf32-target.h"
4802
4803 /* Restore defaults. */
4804 #undef elf_backend_object_p
4805 #undef elf_backend_modify_segment_map
4806 #undef elf_backend_modify_program_headers
4807 #undef elf_backend_final_write_processing
4808
4809 /* VxWorks support. */
4810
4811 #undef TARGET_LITTLE_SYM
4812 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4813 #undef TARGET_LITTLE_NAME
4814 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4815 #undef ELF_OSABI
4816 #undef ELF_MAXPAGESIZE
4817 #define ELF_MAXPAGESIZE 0x1000
4818 #undef elf_backend_plt_alignment
4819 #define elf_backend_plt_alignment 4
4820
4821 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4822 {
4823 is_vxworks /* os */
4824 };
4825
4826 #undef elf_backend_arch_data
4827 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4828
4829 #undef elf_backend_relocs_compatible
4830 #undef elf_backend_add_symbol_hook
4831 #define elf_backend_add_symbol_hook \
4832 elf_vxworks_add_symbol_hook
4833 #undef elf_backend_link_output_symbol_hook
4834 #define elf_backend_link_output_symbol_hook \
4835 elf_vxworks_link_output_symbol_hook
4836 #undef elf_backend_emit_relocs
4837 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4838 #undef elf_backend_final_write_processing
4839 #define elf_backend_final_write_processing \
4840 elf_vxworks_final_write_processing
4841 #undef elf_backend_static_tls_alignment
4842
4843 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4844 define it. */
4845 #undef elf_backend_want_plt_sym
4846 #define elf_backend_want_plt_sym 1
4847
4848 #undef elf32_bed
4849 #define elf32_bed elf32_i386_vxworks_bed
4850
4851 #include "elf32-target.h"
GDB Binutils - Deliverables
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