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Fix excessive memory allocation attempts and possible integer overfloaws when attempt...
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "elfxx-x86.h"
22 #include "elf-nacl.h"
23 #include "elf-vxworks.h"
24 #include "dwarf2.h"
25 #include "opcode/i386.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #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 h->root.non_ir_ref_regular = 1;
1560
1561 if (h->type == STT_GNU_IFUNC)
1562 elf_tdata (info->output_bfd)->has_gnu_symbols
1563 |= elf_gnu_symbol_ifunc;
1564 }
1565
1566 if (r_type == R_386_GOT32X
1567 && (h == NULL || h->type != STT_GNU_IFUNC))
1568 {
1569 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1570 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1571 &r_type, irel, h,
1572 &converted, info))
1573 goto error_return;
1574 }
1575
1576 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1577 symtab_hdr, sym_hashes,
1578 &r_type, GOT_UNKNOWN,
1579 rel, rel_end, h, r_symndx, FALSE))
1580 goto error_return;
1581
1582 switch (r_type)
1583 {
1584 case R_386_TLS_LDM:
1585 htab->tls_ld_or_ldm_got.refcount = 1;
1586 goto create_got;
1587
1588 case R_386_PLT32:
1589 /* This symbol requires a procedure linkage table entry. We
1590 actually build the entry in adjust_dynamic_symbol,
1591 because this might be a case of linking PIC code which is
1592 never referenced by a dynamic object, in which case we
1593 don't need to generate a procedure linkage table entry
1594 after all. */
1595
1596 /* If this is a local symbol, we resolve it directly without
1597 creating a procedure linkage table entry. */
1598 if (h == NULL)
1599 continue;
1600
1601 eh->zero_undefweak &= 0x2;
1602 h->needs_plt = 1;
1603 h->plt.refcount += 1;
1604 break;
1605
1606 case R_386_SIZE32:
1607 size_reloc = TRUE;
1608 goto do_size;
1609
1610 case R_386_TLS_IE_32:
1611 case R_386_TLS_IE:
1612 case R_386_TLS_GOTIE:
1613 if (!bfd_link_executable (info))
1614 info->flags |= DF_STATIC_TLS;
1615 /* Fall through */
1616
1617 case R_386_GOT32:
1618 case R_386_GOT32X:
1619 case R_386_TLS_GD:
1620 case R_386_TLS_GOTDESC:
1621 case R_386_TLS_DESC_CALL:
1622 /* This symbol requires a global offset table entry. */
1623 {
1624 int tls_type, old_tls_type;
1625
1626 switch (r_type)
1627 {
1628 default:
1629 case R_386_GOT32:
1630 case R_386_GOT32X:
1631 tls_type = GOT_NORMAL;
1632 break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1640 else
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1644 break;
1645 case R_386_TLS_IE:
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1648 }
1649
1650 if (h != NULL)
1651 {
1652 h->got.refcount = 1;
1653 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1654 }
1655 else
1656 {
1657 bfd_signed_vma *local_got_refcounts;
1658
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1662 {
1663 bfd_size_type size;
1664
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1671 goto error_return;
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_x86_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_x86_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1677 }
1678 local_got_refcounts[r_symndx] = 1;
1679 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1680 }
1681
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1689 {
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1695 else
1696 {
1697 if (h)
1698 name = h->root.root.string;
1699 else
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1701 NULL);
1702 _bfd_error_handler
1703 /* xgettext:c-format */
1704 (_("%B: `%s' accessed both as normal and "
1705 "thread local symbol"),
1706 abfd, name);
1707 bfd_set_error (bfd_error_bad_value);
1708 goto error_return;
1709 }
1710 }
1711
1712 if (old_tls_type != tls_type)
1713 {
1714 if (h != NULL)
1715 elf_x86_hash_entry (h)->tls_type = tls_type;
1716 else
1717 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1718 }
1719 }
1720 /* Fall through */
1721
1722 case R_386_GOTOFF:
1723 case R_386_GOTPC:
1724 create_got:
1725 if (r_type != R_386_TLS_IE)
1726 {
1727 if (eh != NULL)
1728 eh->zero_undefweak &= 0x2;
1729 break;
1730 }
1731 /* Fall through */
1732
1733 case R_386_TLS_LE_32:
1734 case R_386_TLS_LE:
1735 if (eh != NULL)
1736 eh->zero_undefweak &= 0x2;
1737 if (bfd_link_executable (info))
1738 break;
1739 info->flags |= DF_STATIC_TLS;
1740 goto do_relocation;
1741
1742 case R_386_32:
1743 case R_386_PC32:
1744 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1745 eh->zero_undefweak |= 0x2;
1746 do_relocation:
1747 /* We are called after all symbols have been resolved. Only
1748 relocation against STT_GNU_IFUNC symbol must go through
1749 PLT. */
1750 if (h != NULL
1751 && (bfd_link_executable (info)
1752 || h->type == STT_GNU_IFUNC))
1753 {
1754 /* If this reloc is in a read-only section, we might
1755 need a copy reloc. We can't check reliably at this
1756 stage whether the section is read-only, as input
1757 sections have not yet been mapped to output sections.
1758 Tentatively set the flag for now, and correct in
1759 adjust_dynamic_symbol. */
1760 h->non_got_ref = 1;
1761
1762 /* We may need a .plt entry if the symbol is a function
1763 defined in a shared lib or is a STT_GNU_IFUNC function
1764 referenced from the code or read-only section. */
1765 if (!h->def_regular
1766 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1767 h->plt.refcount += 1;
1768
1769 if (r_type == R_386_PC32)
1770 {
1771 /* Since something like ".long foo - ." may be used
1772 as pointer, make sure that PLT is used if foo is
1773 a function defined in a shared library. */
1774 if ((sec->flags & SEC_CODE) == 0)
1775 h->pointer_equality_needed = 1;
1776 else if (h->type == STT_GNU_IFUNC
1777 && bfd_link_pic (info))
1778 {
1779 _bfd_error_handler
1780 /* xgettext:c-format */
1781 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1782 abfd, h->root.root.string);
1783 bfd_set_error (bfd_error_bad_value);
1784 goto error_return;
1785 }
1786 }
1787 else
1788 {
1789 h->pointer_equality_needed = 1;
1790 /* R_386_32 can be resolved at run-time. */
1791 if (r_type == R_386_32
1792 && (sec->flags & SEC_READONLY) == 0)
1793 eh->func_pointer_refcount += 1;
1794 }
1795 }
1796
1797 size_reloc = FALSE;
1798 do_size:
1799 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
1800 R_386_32))
1801 {
1802 struct elf_dyn_relocs *p;
1803 struct elf_dyn_relocs **head;
1804
1805 /* We must copy these reloc types into the output file.
1806 Create a reloc section in dynobj and make room for
1807 this reloc. */
1808 if (sreloc == NULL)
1809 {
1810 sreloc = _bfd_elf_make_dynamic_reloc_section
1811 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1812
1813 if (sreloc == NULL)
1814 goto error_return;
1815 }
1816
1817 /* If this is a global symbol, we count the number of
1818 relocations we need for this symbol. */
1819 if (h != NULL)
1820 {
1821 head = &eh->dyn_relocs;
1822 }
1823 else
1824 {
1825 /* Track dynamic relocs needed for local syms too.
1826 We really need local syms available to do this
1827 easily. Oh well. */
1828 void **vpp;
1829 asection *s;
1830
1831 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1832 abfd, r_symndx);
1833 if (isym == NULL)
1834 goto error_return;
1835
1836 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1837 if (s == NULL)
1838 s = sec;
1839
1840 vpp = &elf_section_data (s)->local_dynrel;
1841 head = (struct elf_dyn_relocs **)vpp;
1842 }
1843
1844 p = *head;
1845 if (p == NULL || p->sec != sec)
1846 {
1847 bfd_size_type amt = sizeof *p;
1848 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1849 amt);
1850 if (p == NULL)
1851 goto error_return;
1852 p->next = *head;
1853 *head = p;
1854 p->sec = sec;
1855 p->count = 0;
1856 p->pc_count = 0;
1857 }
1858
1859 p->count += 1;
1860 /* Count size relocation as PC-relative relocation. */
1861 if (r_type == R_386_PC32 || size_reloc)
1862 p->pc_count += 1;
1863 }
1864 break;
1865
1866 /* This relocation describes the C++ object vtable hierarchy.
1867 Reconstruct it for later use during GC. */
1868 case R_386_GNU_VTINHERIT:
1869 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1870 goto error_return;
1871 break;
1872
1873 /* This relocation describes which C++ vtable entries are actually
1874 used. Record for later use during GC. */
1875 case R_386_GNU_VTENTRY:
1876 BFD_ASSERT (h != NULL);
1877 if (h != NULL
1878 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1879 goto error_return;
1880 break;
1881
1882 default:
1883 break;
1884 }
1885 }
1886
1887 if (elf_section_data (sec)->this_hdr.contents != contents)
1888 {
1889 if (!converted && !info->keep_memory)
1890 free (contents);
1891 else
1892 {
1893 /* Cache the section contents for elf_link_input_bfd if any
1894 load is converted or --no-keep-memory isn't used. */
1895 elf_section_data (sec)->this_hdr.contents = contents;
1896 }
1897 }
1898
1899 /* Cache relocations if any load is converted. */
1900 if (elf_section_data (sec)->relocs != relocs && converted)
1901 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1902
1903 return TRUE;
1904
1905 error_return:
1906 if (elf_section_data (sec)->this_hdr.contents != contents)
1907 free (contents);
1908 sec->check_relocs_failed = 1;
1909 return FALSE;
1910 }
1911
1912 /* Set the correct type for an x86 ELF section. We do this by the
1913 section name, which is a hack, but ought to work. */
1914
1915 static bfd_boolean
1916 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1917 Elf_Internal_Shdr *hdr,
1918 asection *sec)
1919 {
1920 const char *name;
1921
1922 name = bfd_get_section_name (abfd, sec);
1923
1924 /* This is an ugly, but unfortunately necessary hack that is
1925 needed when producing EFI binaries on x86. It tells
1926 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1927 containing ELF relocation info. We need this hack in order to
1928 be able to generate ELF binaries that can be translated into
1929 EFI applications (which are essentially COFF objects). Those
1930 files contain a COFF ".reloc" section inside an ELFNN object,
1931 which would normally cause BFD to segfault because it would
1932 attempt to interpret this section as containing relocation
1933 entries for section "oc". With this hack enabled, ".reloc"
1934 will be treated as a normal data section, which will avoid the
1935 segfault. However, you won't be able to create an ELFNN binary
1936 with a section named "oc" that needs relocations, but that's
1937 the kind of ugly side-effects you get when detecting section
1938 types based on their names... In practice, this limitation is
1939 unlikely to bite. */
1940 if (strcmp (name, ".reloc") == 0)
1941 hdr->sh_type = SHT_PROGBITS;
1942
1943 return TRUE;
1944 }
1945
1946 /* Return the relocation value for @tpoff relocation
1947 if STT_TLS virtual address is ADDRESS. */
1948
1949 static bfd_vma
1950 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1951 {
1952 struct elf_link_hash_table *htab = elf_hash_table (info);
1953 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1954 bfd_vma static_tls_size;
1955
1956 /* If tls_sec is NULL, we should have signalled an error already. */
1957 if (htab->tls_sec == NULL)
1958 return 0;
1959
1960 /* Consider special static TLS alignment requirements. */
1961 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1962 return static_tls_size + htab->tls_sec->vma - address;
1963 }
1964
1965 /* Relocate an i386 ELF section. */
1966
1967 static bfd_boolean
1968 elf_i386_relocate_section (bfd *output_bfd,
1969 struct bfd_link_info *info,
1970 bfd *input_bfd,
1971 asection *input_section,
1972 bfd_byte *contents,
1973 Elf_Internal_Rela *relocs,
1974 Elf_Internal_Sym *local_syms,
1975 asection **local_sections)
1976 {
1977 struct elf_x86_link_hash_table *htab;
1978 Elf_Internal_Shdr *symtab_hdr;
1979 struct elf_link_hash_entry **sym_hashes;
1980 bfd_vma *local_got_offsets;
1981 bfd_vma *local_tlsdesc_gotents;
1982 Elf_Internal_Rela *rel;
1983 Elf_Internal_Rela *wrel;
1984 Elf_Internal_Rela *relend;
1985 bfd_boolean is_vxworks_tls;
1986 unsigned plt_entry_size;
1987
1988 /* Skip if check_relocs failed. */
1989 if (input_section->check_relocs_failed)
1990 return FALSE;
1991
1992 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1993 if (htab == NULL)
1994 return FALSE;
1995
1996 BFD_ASSERT (is_x86_elf (input_bfd, htab));
1997
1998 symtab_hdr = &elf_symtab_hdr (input_bfd);
1999 sym_hashes = elf_sym_hashes (input_bfd);
2000 local_got_offsets = elf_local_got_offsets (input_bfd);
2001 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2002 /* We have to handle relocations in vxworks .tls_vars sections
2003 specially, because the dynamic loader is 'weird'. */
2004 is_vxworks_tls = (htab->target_os == is_vxworks
2005 && bfd_link_pic (info)
2006 && !strcmp (input_section->output_section->name,
2007 ".tls_vars"));
2008
2009 _bfd_x86_elf_set_tls_module_base (info);
2010
2011 plt_entry_size = htab->plt.plt_entry_size;
2012
2013 rel = wrel = relocs;
2014 relend = relocs + input_section->reloc_count;
2015 for (; rel < relend; wrel++, rel++)
2016 {
2017 unsigned int r_type, r_type_tls;
2018 reloc_howto_type *howto;
2019 unsigned long r_symndx;
2020 struct elf_link_hash_entry *h;
2021 struct elf_x86_link_hash_entry *eh;
2022 Elf_Internal_Sym *sym;
2023 asection *sec;
2024 bfd_vma off, offplt, plt_offset;
2025 bfd_vma relocation;
2026 bfd_boolean unresolved_reloc;
2027 bfd_reloc_status_type r;
2028 unsigned int indx;
2029 int tls_type;
2030 bfd_vma st_size;
2031 asection *resolved_plt;
2032 bfd_boolean resolved_to_zero;
2033 bfd_boolean relative_reloc;
2034
2035 r_type = ELF32_R_TYPE (rel->r_info);
2036 if (r_type == R_386_GNU_VTINHERIT
2037 || r_type == R_386_GNU_VTENTRY)
2038 {
2039 if (wrel != rel)
2040 *wrel = *rel;
2041 continue;
2042 }
2043
2044 if ((indx = r_type) >= R_386_standard
2045 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2046 >= R_386_ext - R_386_standard)
2047 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2048 >= R_386_ext2 - R_386_ext))
2049 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2050
2051 howto = elf_howto_table + indx;
2052
2053 r_symndx = ELF32_R_SYM (rel->r_info);
2054 h = NULL;
2055 sym = NULL;
2056 sec = NULL;
2057 unresolved_reloc = FALSE;
2058 if (r_symndx < symtab_hdr->sh_info)
2059 {
2060 sym = local_syms + r_symndx;
2061 sec = local_sections[r_symndx];
2062 relocation = (sec->output_section->vma
2063 + sec->output_offset
2064 + sym->st_value);
2065 st_size = sym->st_size;
2066
2067 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2068 && ((sec->flags & SEC_MERGE) != 0
2069 || (bfd_link_relocatable (info)
2070 && sec->output_offset != 0)))
2071 {
2072 bfd_vma addend;
2073 bfd_byte *where = contents + rel->r_offset;
2074
2075 switch (howto->size)
2076 {
2077 case 0:
2078 addend = bfd_get_8 (input_bfd, where);
2079 if (howto->pc_relative)
2080 {
2081 addend = (addend ^ 0x80) - 0x80;
2082 addend += 1;
2083 }
2084 break;
2085 case 1:
2086 addend = bfd_get_16 (input_bfd, where);
2087 if (howto->pc_relative)
2088 {
2089 addend = (addend ^ 0x8000) - 0x8000;
2090 addend += 2;
2091 }
2092 break;
2093 case 2:
2094 addend = bfd_get_32 (input_bfd, where);
2095 if (howto->pc_relative)
2096 {
2097 addend = (addend ^ 0x80000000) - 0x80000000;
2098 addend += 4;
2099 }
2100 break;
2101 default:
2102 abort ();
2103 }
2104
2105 if (bfd_link_relocatable (info))
2106 addend += sec->output_offset;
2107 else
2108 {
2109 asection *msec = sec;
2110 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2111 addend);
2112 addend -= relocation;
2113 addend += msec->output_section->vma + msec->output_offset;
2114 }
2115
2116 switch (howto->size)
2117 {
2118 case 0:
2119 /* FIXME: overflow checks. */
2120 if (howto->pc_relative)
2121 addend -= 1;
2122 bfd_put_8 (input_bfd, addend, where);
2123 break;
2124 case 1:
2125 if (howto->pc_relative)
2126 addend -= 2;
2127 bfd_put_16 (input_bfd, addend, where);
2128 break;
2129 case 2:
2130 if (howto->pc_relative)
2131 addend -= 4;
2132 bfd_put_32 (input_bfd, addend, where);
2133 break;
2134 }
2135 }
2136 else if (!bfd_link_relocatable (info)
2137 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2138 {
2139 /* Relocate against local STT_GNU_IFUNC symbol. */
2140 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2141 FALSE);
2142 if (h == NULL)
2143 abort ();
2144
2145 /* Set STT_GNU_IFUNC symbol value. */
2146 h->root.u.def.value = sym->st_value;
2147 h->root.u.def.section = sec;
2148 }
2149 }
2150 else
2151 {
2152 bfd_boolean warned ATTRIBUTE_UNUSED;
2153 bfd_boolean ignored ATTRIBUTE_UNUSED;
2154
2155 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2156 r_symndx, symtab_hdr, sym_hashes,
2157 h, sec, relocation,
2158 unresolved_reloc, warned, ignored);
2159 st_size = h->size;
2160 }
2161
2162 if (sec != NULL && discarded_section (sec))
2163 {
2164 _bfd_clear_contents (howto, input_bfd, input_section,
2165 contents + rel->r_offset);
2166 wrel->r_offset = rel->r_offset;
2167 wrel->r_info = 0;
2168 wrel->r_addend = 0;
2169
2170 /* For ld -r, remove relocations in debug sections against
2171 sections defined in discarded sections. Not done for
2172 eh_frame editing code expects to be present. */
2173 if (bfd_link_relocatable (info)
2174 && (input_section->flags & SEC_DEBUGGING))
2175 wrel--;
2176
2177 continue;
2178 }
2179
2180 if (bfd_link_relocatable (info))
2181 {
2182 if (wrel != rel)
2183 *wrel = *rel;
2184 continue;
2185 }
2186
2187 eh = (struct elf_x86_link_hash_entry *) h;
2188
2189 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2190 it here if it is defined in a non-shared object. */
2191 if (h != NULL
2192 && h->type == STT_GNU_IFUNC
2193 && h->def_regular)
2194 {
2195 asection *gotplt, *base_got;
2196 bfd_vma plt_index;
2197 const char *name;
2198
2199 if ((input_section->flags & SEC_ALLOC) == 0)
2200 {
2201 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2202 sections because such sections are not SEC_ALLOC and
2203 thus ld.so will not process them. */
2204 if ((input_section->flags & SEC_DEBUGGING) != 0)
2205 continue;
2206 abort ();
2207 }
2208
2209 /* STT_GNU_IFUNC symbol must go through PLT. */
2210 if (htab->elf.splt != NULL)
2211 {
2212 if (htab->plt_second != NULL)
2213 {
2214 resolved_plt = htab->plt_second;
2215 plt_offset = eh->plt_second.offset;
2216 }
2217 else
2218 {
2219 resolved_plt = htab->elf.splt;
2220 plt_offset = h->plt.offset;
2221 }
2222 gotplt = htab->elf.sgotplt;
2223 }
2224 else
2225 {
2226 resolved_plt = htab->elf.iplt;
2227 plt_offset = h->plt.offset;
2228 gotplt = htab->elf.igotplt;
2229 }
2230
2231 switch (r_type)
2232 {
2233 default:
2234 break;
2235
2236 case R_386_GOT32:
2237 case R_386_GOT32X:
2238 base_got = htab->elf.sgot;
2239 off = h->got.offset;
2240
2241 if (base_got == NULL)
2242 abort ();
2243
2244 if (off == (bfd_vma) -1)
2245 {
2246 /* We can't use h->got.offset here to save state, or
2247 even just remember the offset, as finish_dynamic_symbol
2248 would use that as offset into .got. */
2249
2250 if (h->plt.offset == (bfd_vma) -1)
2251 abort ();
2252
2253 if (htab->elf.splt != NULL)
2254 {
2255 plt_index = (h->plt.offset / plt_entry_size
2256 - htab->plt.has_plt0);
2257 off = (plt_index + 3) * 4;
2258 base_got = htab->elf.sgotplt;
2259 }
2260 else
2261 {
2262 plt_index = h->plt.offset / plt_entry_size;
2263 off = plt_index * 4;
2264 base_got = htab->elf.igotplt;
2265 }
2266
2267 if (h->dynindx == -1
2268 || h->forced_local
2269 || info->symbolic)
2270 {
2271 /* This references the local defitionion. We must
2272 initialize this entry in the global offset table.
2273 Since the offset must always be a multiple of 8,
2274 we use the least significant bit to record
2275 whether we have initialized it already.
2276
2277 When doing a dynamic link, we create a .rela.got
2278 relocation entry to initialize the value. This
2279 is done in the finish_dynamic_symbol routine. */
2280 if ((off & 1) != 0)
2281 off &= ~1;
2282 else
2283 {
2284 bfd_put_32 (output_bfd, relocation,
2285 base_got->contents + off);
2286 h->got.offset |= 1;
2287 }
2288 }
2289
2290 relocation = off;
2291 }
2292 else
2293 relocation = (base_got->output_section->vma
2294 + base_got->output_offset + off
2295 - gotplt->output_section->vma
2296 - gotplt->output_offset);
2297
2298 if (rel->r_offset > 1
2299 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2300 && *(contents + rel->r_offset - 2) != 0x8d)
2301 {
2302 if (bfd_link_pic (info))
2303 goto disallow_got32;
2304
2305 /* Add the GOT base if there is no base register. */
2306 relocation += (gotplt->output_section->vma
2307 + gotplt->output_offset);
2308 }
2309 else if (htab->elf.splt == NULL)
2310 {
2311 /* Adjust for static executables. */
2312 relocation += gotplt->output_offset;
2313 }
2314
2315 goto do_relocation;
2316 }
2317
2318 if (h->plt.offset == (bfd_vma) -1)
2319 {
2320 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2321 if (r_type == R_386_32
2322 && (input_section->flags & SEC_CODE) == 0)
2323 goto do_ifunc_pointer;
2324 goto bad_ifunc_reloc;
2325 }
2326
2327 relocation = (resolved_plt->output_section->vma
2328 + resolved_plt->output_offset + plt_offset);
2329
2330 switch (r_type)
2331 {
2332 default:
2333 bad_ifunc_reloc:
2334 if (h->root.root.string)
2335 name = h->root.root.string;
2336 else
2337 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2338 NULL);
2339 _bfd_error_handler
2340 /* xgettext:c-format */
2341 (_("%B: relocation %s against STT_GNU_IFUNC "
2342 "symbol `%s' isn't supported"), input_bfd,
2343 howto->name, name);
2344 bfd_set_error (bfd_error_bad_value);
2345 return FALSE;
2346
2347 case R_386_32:
2348 /* Generate dynamic relcoation only when there is a
2349 non-GOT reference in a shared object. */
2350 if ((bfd_link_pic (info) && h->non_got_ref)
2351 || h->plt.offset == (bfd_vma) -1)
2352 {
2353 Elf_Internal_Rela outrel;
2354 asection *sreloc;
2355 bfd_vma offset;
2356
2357 do_ifunc_pointer:
2358 /* Need a dynamic relocation to get the real function
2359 adddress. */
2360 offset = _bfd_elf_section_offset (output_bfd,
2361 info,
2362 input_section,
2363 rel->r_offset);
2364 if (offset == (bfd_vma) -1
2365 || offset == (bfd_vma) -2)
2366 abort ();
2367
2368 outrel.r_offset = (input_section->output_section->vma
2369 + input_section->output_offset
2370 + offset);
2371
2372 if (POINTER_LOCAL_IFUNC_P (info, h))
2373 {
2374 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2375 h->root.root.string,
2376 h->root.u.def.section->owner);
2377
2378 /* This symbol is resolved locally. */
2379 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2380 bfd_put_32 (output_bfd,
2381 (h->root.u.def.value
2382 + h->root.u.def.section->output_section->vma
2383 + h->root.u.def.section->output_offset),
2384 contents + offset);
2385 }
2386 else
2387 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2388
2389 /* Dynamic relocations are stored in
2390 1. .rel.ifunc section in PIC object.
2391 2. .rel.got section in dynamic executable.
2392 3. .rel.iplt section in static executable. */
2393 if (bfd_link_pic (info))
2394 sreloc = htab->elf.irelifunc;
2395 else if (htab->elf.splt != NULL)
2396 sreloc = htab->elf.srelgot;
2397 else
2398 sreloc = htab->elf.irelplt;
2399 elf_append_rel (output_bfd, sreloc, &outrel);
2400
2401 /* If this reloc is against an external symbol, we
2402 do not want to fiddle with the addend. Otherwise,
2403 we need to include the symbol value so that it
2404 becomes an addend for the dynamic reloc. For an
2405 internal symbol, we have updated addend. */
2406 continue;
2407 }
2408 /* FALLTHROUGH */
2409 case R_386_PC32:
2410 case R_386_PLT32:
2411 goto do_relocation;
2412
2413 case R_386_GOTOFF:
2414 relocation -= (gotplt->output_section->vma
2415 + gotplt->output_offset);
2416 goto do_relocation;
2417 }
2418 }
2419
2420 resolved_to_zero = (eh != NULL
2421 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2422
2423 switch (r_type)
2424 {
2425 case R_386_GOT32X:
2426 /* Avoid optimizing _DYNAMIC since ld.so may use its
2427 link-time address. */
2428 if (h == htab->elf.hdynamic)
2429 goto r_386_got32;
2430
2431 if (bfd_link_pic (info))
2432 {
2433 /* It is OK to convert mov to lea and convert indirect
2434 branch to direct branch. It is OK to convert adc,
2435 add, and, cmp, or, sbb, sub, test, xor only when PIC
2436 is false. */
2437 unsigned int opcode, addend;
2438 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2439 if (addend != 0)
2440 goto r_386_got32;
2441 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2442 if (opcode != 0x8b && opcode != 0xff)
2443 goto r_386_got32;
2444 }
2445
2446 /* Resolve "mov GOT[(%reg)], %reg",
2447 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2448 and "binop foo@GOT[(%reg)], %reg". */
2449 if (h == NULL
2450 || (h->plt.offset == (bfd_vma) -1
2451 && h->got.offset == (bfd_vma) -1)
2452 || htab->elf.sgotplt == NULL)
2453 abort ();
2454
2455 offplt = (htab->elf.sgotplt->output_section->vma
2456 + htab->elf.sgotplt->output_offset);
2457
2458 /* It is relative to .got.plt section. */
2459 if (h->got.offset != (bfd_vma) -1)
2460 /* Use GOT entry. Mask off the least significant bit in
2461 GOT offset which may be set by R_386_GOT32 processing
2462 below. */
2463 relocation = (htab->elf.sgot->output_section->vma
2464 + htab->elf.sgot->output_offset
2465 + (h->got.offset & ~1) - offplt);
2466 else
2467 /* Use GOTPLT entry. */
2468 relocation = (h->plt.offset / plt_entry_size
2469 - htab->plt.has_plt0 + 3) * 4;
2470
2471 if (!bfd_link_pic (info))
2472 {
2473 /* If not PIC, add the .got.plt section address for
2474 baseless addressing. */
2475 unsigned int modrm;
2476 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2477 if ((modrm & 0xc7) == 0x5)
2478 relocation += offplt;
2479 }
2480
2481 unresolved_reloc = FALSE;
2482 break;
2483
2484 case R_386_GOT32:
2485 r_386_got32:
2486 /* Relocation is to the entry for this symbol in the global
2487 offset table. */
2488 if (htab->elf.sgot == NULL)
2489 abort ();
2490
2491 relative_reloc = FALSE;
2492 if (h != NULL)
2493 {
2494 off = h->got.offset;
2495 if (RESOLVED_LOCALLY_P (info, h, htab))
2496 {
2497 /* We must initialize this entry in the global offset
2498 table. Since the offset must always be a multiple
2499 of 4, we use the least significant bit to record
2500 whether we have initialized it already.
2501
2502 When doing a dynamic link, we create a .rel.got
2503 relocation entry to initialize the value. This
2504 is done in the finish_dynamic_symbol routine. */
2505 if ((off & 1) != 0)
2506 off &= ~1;
2507 else
2508 {
2509 bfd_put_32 (output_bfd, relocation,
2510 htab->elf.sgot->contents + off);
2511 h->got.offset |= 1;
2512
2513 if (GENERATE_RELATIVE_RELOC_P (info, h))
2514 {
2515 /* PR ld/21402: If this symbol isn't dynamic
2516 in PIC, generate R_386_RELATIVE here. */
2517 eh->no_finish_dynamic_symbol = 1;
2518 relative_reloc = TRUE;
2519 }
2520 }
2521 }
2522 else
2523 unresolved_reloc = FALSE;
2524 }
2525 else
2526 {
2527 if (local_got_offsets == NULL)
2528 abort ();
2529
2530 off = local_got_offsets[r_symndx];
2531
2532 /* The offset must always be a multiple of 4. We use
2533 the least significant bit to record whether we have
2534 already generated the necessary reloc. */
2535 if ((off & 1) != 0)
2536 off &= ~1;
2537 else
2538 {
2539 bfd_put_32 (output_bfd, relocation,
2540 htab->elf.sgot->contents + off);
2541 local_got_offsets[r_symndx] |= 1;
2542
2543 if (bfd_link_pic (info))
2544 relative_reloc = TRUE;
2545 }
2546 }
2547
2548 if (relative_reloc)
2549 {
2550 asection *s;
2551 Elf_Internal_Rela outrel;
2552
2553 s = htab->elf.srelgot;
2554 if (s == NULL)
2555 abort ();
2556
2557 outrel.r_offset = (htab->elf.sgot->output_section->vma
2558 + htab->elf.sgot->output_offset
2559 + off);
2560 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2561 elf_append_rel (output_bfd, s, &outrel);
2562 }
2563
2564 if (off >= (bfd_vma) -2)
2565 abort ();
2566
2567 relocation = (htab->elf.sgot->output_section->vma
2568 + htab->elf.sgot->output_offset + off);
2569 if (rel->r_offset > 1
2570 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2571 && *(contents + rel->r_offset - 2) != 0x8d)
2572 {
2573 if (bfd_link_pic (info))
2574 {
2575 /* For PIC, disallow R_386_GOT32 without a base
2576 register, except for "lea foo@GOT, %reg", since
2577 we don't know what the GOT base is. */
2578 const char *name;
2579
2580 disallow_got32:
2581 if (h == NULL || h->root.root.string == NULL)
2582 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2583 NULL);
2584 else
2585 name = h->root.root.string;
2586
2587 _bfd_error_handler
2588 /* xgettext:c-format */
2589 (_("%B: direct GOT relocation %s against `%s'"
2590 " without base register can not be used"
2591 " when making a shared object"),
2592 input_bfd, howto->name, name);
2593 bfd_set_error (bfd_error_bad_value);
2594 return FALSE;
2595 }
2596 }
2597 else
2598 {
2599 /* Subtract the .got.plt section address only with a base
2600 register. */
2601 relocation -= (htab->elf.sgotplt->output_section->vma
2602 + htab->elf.sgotplt->output_offset);
2603 }
2604
2605 break;
2606
2607 case R_386_GOTOFF:
2608 /* Relocation is relative to the start of the global offset
2609 table. */
2610
2611 /* Check to make sure it isn't a protected function or data
2612 symbol for shared library since it may not be local when
2613 used as function address or with copy relocation. We also
2614 need to make sure that a symbol is referenced locally. */
2615 if (!bfd_link_executable (info) && h)
2616 {
2617 if (!h->def_regular)
2618 {
2619 const char *v;
2620
2621 switch (ELF_ST_VISIBILITY (h->other))
2622 {
2623 case STV_HIDDEN:
2624 v = _("hidden symbol");
2625 break;
2626 case STV_INTERNAL:
2627 v = _("internal symbol");
2628 break;
2629 case STV_PROTECTED:
2630 v = _("protected symbol");
2631 break;
2632 default:
2633 v = _("symbol");
2634 break;
2635 }
2636
2637 _bfd_error_handler
2638 /* xgettext:c-format */
2639 (_("%B: relocation R_386_GOTOFF against undefined %s"
2640 " `%s' can not be used when making a shared object"),
2641 input_bfd, v, h->root.root.string);
2642 bfd_set_error (bfd_error_bad_value);
2643 return FALSE;
2644 }
2645 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2646 && (h->type == STT_FUNC
2647 || h->type == STT_OBJECT)
2648 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2649 {
2650 _bfd_error_handler
2651 /* xgettext:c-format */
2652 (_("%B: relocation R_386_GOTOFF against protected %s"
2653 " `%s' can not be used when making a shared object"),
2654 input_bfd,
2655 h->type == STT_FUNC ? "function" : "data",
2656 h->root.root.string);
2657 bfd_set_error (bfd_error_bad_value);
2658 return FALSE;
2659 }
2660 }
2661
2662 /* Note that sgot is not involved in this
2663 calculation. We always want the start of .got.plt. If we
2664 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2665 permitted by the ABI, we might have to change this
2666 calculation. */
2667 relocation -= htab->elf.sgotplt->output_section->vma
2668 + htab->elf.sgotplt->output_offset;
2669 break;
2670
2671 case R_386_GOTPC:
2672 /* Use global offset table as symbol value. */
2673 relocation = htab->elf.sgotplt->output_section->vma
2674 + htab->elf.sgotplt->output_offset;
2675 unresolved_reloc = FALSE;
2676 break;
2677
2678 case R_386_PLT32:
2679 /* Relocation is to the entry for this symbol in the
2680 procedure linkage table. */
2681
2682 /* Resolve a PLT32 reloc against a local symbol directly,
2683 without using the procedure linkage table. */
2684 if (h == NULL)
2685 break;
2686
2687 if ((h->plt.offset == (bfd_vma) -1
2688 && eh->plt_got.offset == (bfd_vma) -1)
2689 || htab->elf.splt == NULL)
2690 {
2691 /* We didn't make a PLT entry for this symbol. This
2692 happens when statically linking PIC code, or when
2693 using -Bsymbolic. */
2694 break;
2695 }
2696
2697 if (h->plt.offset != (bfd_vma) -1)
2698 {
2699 if (htab->plt_second != NULL)
2700 {
2701 resolved_plt = htab->plt_second;
2702 plt_offset = eh->plt_second.offset;
2703 }
2704 else
2705 {
2706 resolved_plt = htab->elf.splt;
2707 plt_offset = h->plt.offset;
2708 }
2709 }
2710 else
2711 {
2712 resolved_plt = htab->plt_got;
2713 plt_offset = eh->plt_got.offset;
2714 }
2715
2716 relocation = (resolved_plt->output_section->vma
2717 + resolved_plt->output_offset
2718 + plt_offset);
2719 unresolved_reloc = FALSE;
2720 break;
2721
2722 case R_386_SIZE32:
2723 /* Set to symbol size. */
2724 relocation = st_size;
2725 /* Fall through. */
2726
2727 case R_386_32:
2728 case R_386_PC32:
2729 if ((input_section->flags & SEC_ALLOC) == 0
2730 || is_vxworks_tls)
2731 break;
2732
2733 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2734 FALSE, resolved_to_zero,
2735 (r_type == R_386_PC32)))
2736 {
2737 Elf_Internal_Rela outrel;
2738 bfd_boolean skip, relocate;
2739 asection *sreloc;
2740
2741 /* When generating a shared object, these relocations
2742 are copied into the output file to be resolved at run
2743 time. */
2744
2745 skip = FALSE;
2746 relocate = FALSE;
2747
2748 outrel.r_offset =
2749 _bfd_elf_section_offset (output_bfd, info, input_section,
2750 rel->r_offset);
2751 if (outrel.r_offset == (bfd_vma) -1)
2752 skip = TRUE;
2753 else if (outrel.r_offset == (bfd_vma) -2)
2754 skip = TRUE, relocate = TRUE;
2755 outrel.r_offset += (input_section->output_section->vma
2756 + input_section->output_offset);
2757
2758 if (skip)
2759 memset (&outrel, 0, sizeof outrel);
2760 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2761 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2762 else
2763 {
2764 /* This symbol is local, or marked to become local. */
2765 relocate = TRUE;
2766 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2767 }
2768
2769 sreloc = elf_section_data (input_section)->sreloc;
2770
2771 if (sreloc == NULL || sreloc->contents == NULL)
2772 {
2773 r = bfd_reloc_notsupported;
2774 goto check_relocation_error;
2775 }
2776
2777 elf_append_rel (output_bfd, sreloc, &outrel);
2778
2779 /* If this reloc is against an external symbol, we do
2780 not want to fiddle with the addend. Otherwise, we
2781 need to include the symbol value so that it becomes
2782 an addend for the dynamic reloc. */
2783 if (! relocate)
2784 continue;
2785 }
2786 break;
2787
2788 case R_386_TLS_IE:
2789 if (!bfd_link_executable (info))
2790 {
2791 Elf_Internal_Rela outrel;
2792 asection *sreloc;
2793
2794 outrel.r_offset = rel->r_offset
2795 + input_section->output_section->vma
2796 + input_section->output_offset;
2797 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2798 sreloc = elf_section_data (input_section)->sreloc;
2799 if (sreloc == NULL)
2800 abort ();
2801 elf_append_rel (output_bfd, sreloc, &outrel);
2802 }
2803 /* Fall through */
2804
2805 case R_386_TLS_GD:
2806 case R_386_TLS_GOTDESC:
2807 case R_386_TLS_DESC_CALL:
2808 case R_386_TLS_IE_32:
2809 case R_386_TLS_GOTIE:
2810 tls_type = GOT_UNKNOWN;
2811 if (h == NULL && local_got_offsets)
2812 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2813 else if (h != NULL)
2814 tls_type = elf_x86_hash_entry(h)->tls_type;
2815 if (tls_type == GOT_TLS_IE)
2816 tls_type = GOT_TLS_IE_NEG;
2817
2818 r_type_tls = r_type;
2819 if (! elf_i386_tls_transition (info, input_bfd,
2820 input_section, contents,
2821 symtab_hdr, sym_hashes,
2822 &r_type_tls, tls_type, rel,
2823 relend, h, r_symndx, TRUE))
2824 return FALSE;
2825
2826 if (r_type_tls == R_386_TLS_LE_32)
2827 {
2828 BFD_ASSERT (! unresolved_reloc);
2829 if (r_type == R_386_TLS_GD)
2830 {
2831 unsigned int type;
2832 bfd_vma roff;
2833
2834 /* GD->LE transition. */
2835 type = *(contents + rel->r_offset - 2);
2836 if (type == 0x04)
2837 {
2838 /* Change
2839 leal foo@tlsgd(,%ebx,1), %eax
2840 call ___tls_get_addr@PLT
2841 into:
2842 movl %gs:0, %eax
2843 subl $foo@tpoff, %eax
2844 (6 byte form of subl). */
2845 roff = rel->r_offset + 5;
2846 }
2847 else
2848 {
2849 /* Change
2850 leal foo@tlsgd(%ebx), %eax
2851 call ___tls_get_addr@PLT
2852 nop
2853 or
2854 leal foo@tlsgd(%reg), %eax
2855 call *___tls_get_addr@GOT(%reg)
2856 which may be converted to
2857 addr32 call ___tls_get_addr
2858 into:
2859 movl %gs:0, %eax; subl $foo@tpoff, %eax
2860 (6 byte form of subl). */
2861 roff = rel->r_offset + 6;
2862 }
2863 memcpy (contents + roff - 8,
2864 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2865 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2866 contents + roff);
2867 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2868 rel++;
2869 wrel++;
2870 continue;
2871 }
2872 else if (r_type == R_386_TLS_GOTDESC)
2873 {
2874 /* GDesc -> LE transition.
2875 It's originally something like:
2876 leal x@tlsdesc(%ebx), %eax
2877
2878 leal x@ntpoff, %eax
2879
2880 Registers other than %eax may be set up here. */
2881
2882 unsigned int val;
2883 bfd_vma roff;
2884
2885 roff = rel->r_offset;
2886 val = bfd_get_8 (input_bfd, contents + roff - 1);
2887
2888 /* Now modify the instruction as appropriate. */
2889 /* aoliva FIXME: remove the above and xor the byte
2890 below with 0x86. */
2891 bfd_put_8 (output_bfd, val ^ 0x86,
2892 contents + roff - 1);
2893 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2894 contents + roff);
2895 continue;
2896 }
2897 else if (r_type == R_386_TLS_DESC_CALL)
2898 {
2899 /* GDesc -> LE transition.
2900 It's originally:
2901 call *(%eax)
2902 Turn it into:
2903 xchg %ax,%ax */
2904
2905 bfd_vma roff;
2906
2907 roff = rel->r_offset;
2908 bfd_put_8 (output_bfd, 0x66, contents + roff);
2909 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2910 continue;
2911 }
2912 else if (r_type == R_386_TLS_IE)
2913 {
2914 unsigned int val;
2915
2916 /* IE->LE transition:
2917 Originally it can be one of:
2918 movl foo, %eax
2919 movl foo, %reg
2920 addl foo, %reg
2921 We change it into:
2922 movl $foo, %eax
2923 movl $foo, %reg
2924 addl $foo, %reg. */
2925 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2926 if (val == 0xa1)
2927 {
2928 /* movl foo, %eax. */
2929 bfd_put_8 (output_bfd, 0xb8,
2930 contents + rel->r_offset - 1);
2931 }
2932 else
2933 {
2934 unsigned int type;
2935
2936 type = bfd_get_8 (input_bfd,
2937 contents + rel->r_offset - 2);
2938 switch (type)
2939 {
2940 case 0x8b:
2941 /* movl */
2942 bfd_put_8 (output_bfd, 0xc7,
2943 contents + rel->r_offset - 2);
2944 bfd_put_8 (output_bfd,
2945 0xc0 | ((val >> 3) & 7),
2946 contents + rel->r_offset - 1);
2947 break;
2948 case 0x03:
2949 /* addl */
2950 bfd_put_8 (output_bfd, 0x81,
2951 contents + rel->r_offset - 2);
2952 bfd_put_8 (output_bfd,
2953 0xc0 | ((val >> 3) & 7),
2954 contents + rel->r_offset - 1);
2955 break;
2956 default:
2957 BFD_FAIL ();
2958 break;
2959 }
2960 }
2961 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2962 contents + rel->r_offset);
2963 continue;
2964 }
2965 else
2966 {
2967 unsigned int val, type;
2968
2969 /* {IE_32,GOTIE}->LE transition:
2970 Originally it can be one of:
2971 subl foo(%reg1), %reg2
2972 movl foo(%reg1), %reg2
2973 addl foo(%reg1), %reg2
2974 We change it into:
2975 subl $foo, %reg2
2976 movl $foo, %reg2 (6 byte form)
2977 addl $foo, %reg2. */
2978 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2979 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2980 if (type == 0x8b)
2981 {
2982 /* movl */
2983 bfd_put_8 (output_bfd, 0xc7,
2984 contents + rel->r_offset - 2);
2985 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2986 contents + rel->r_offset - 1);
2987 }
2988 else if (type == 0x2b)
2989 {
2990 /* subl */
2991 bfd_put_8 (output_bfd, 0x81,
2992 contents + rel->r_offset - 2);
2993 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2994 contents + rel->r_offset - 1);
2995 }
2996 else if (type == 0x03)
2997 {
2998 /* addl */
2999 bfd_put_8 (output_bfd, 0x81,
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
3005 BFD_FAIL ();
3006 if (r_type == R_386_TLS_GOTIE)
3007 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3008 contents + rel->r_offset);
3009 else
3010 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3011 contents + rel->r_offset);
3012 continue;
3013 }
3014 }
3015
3016 if (htab->elf.sgot == NULL)
3017 abort ();
3018
3019 if (h != NULL)
3020 {
3021 off = h->got.offset;
3022 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3023 }
3024 else
3025 {
3026 if (local_got_offsets == NULL)
3027 abort ();
3028
3029 off = local_got_offsets[r_symndx];
3030 offplt = local_tlsdesc_gotents[r_symndx];
3031 }
3032
3033 if ((off & 1) != 0)
3034 off &= ~1;
3035 else
3036 {
3037 Elf_Internal_Rela outrel;
3038 int dr_type;
3039 asection *sreloc;
3040
3041 if (htab->elf.srelgot == NULL)
3042 abort ();
3043
3044 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3045
3046 if (GOT_TLS_GDESC_P (tls_type))
3047 {
3048 bfd_byte *loc;
3049 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3050 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3051 <= htab->elf.sgotplt->size);
3052 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3053 + htab->elf.sgotplt->output_offset
3054 + offplt
3055 + htab->sgotplt_jump_table_size);
3056 sreloc = htab->elf.srelplt;
3057 loc = sreloc->contents;
3058 loc += (htab->next_tls_desc_index++
3059 * sizeof (Elf32_External_Rel));
3060 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3061 <= sreloc->contents + sreloc->size);
3062 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3063 if (indx == 0)
3064 {
3065 BFD_ASSERT (! unresolved_reloc);
3066 bfd_put_32 (output_bfd,
3067 relocation - _bfd_x86_elf_dtpoff_base (info),
3068 htab->elf.sgotplt->contents + offplt
3069 + htab->sgotplt_jump_table_size + 4);
3070 }
3071 else
3072 {
3073 bfd_put_32 (output_bfd, 0,
3074 htab->elf.sgotplt->contents + offplt
3075 + htab->sgotplt_jump_table_size + 4);
3076 }
3077 }
3078
3079 sreloc = htab->elf.srelgot;
3080
3081 outrel.r_offset = (htab->elf.sgot->output_section->vma
3082 + htab->elf.sgot->output_offset + off);
3083
3084 if (GOT_TLS_GD_P (tls_type))
3085 dr_type = R_386_TLS_DTPMOD32;
3086 else if (GOT_TLS_GDESC_P (tls_type))
3087 goto dr_done;
3088 else if (tls_type == GOT_TLS_IE_POS)
3089 dr_type = R_386_TLS_TPOFF;
3090 else
3091 dr_type = R_386_TLS_TPOFF32;
3092
3093 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3094 bfd_put_32 (output_bfd,
3095 relocation - _bfd_x86_elf_dtpoff_base (info),
3096 htab->elf.sgot->contents + off);
3097 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3098 bfd_put_32 (output_bfd,
3099 _bfd_x86_elf_dtpoff_base (info) - relocation,
3100 htab->elf.sgot->contents + off);
3101 else if (dr_type != R_386_TLS_DESC)
3102 bfd_put_32 (output_bfd, 0,
3103 htab->elf.sgot->contents + off);
3104 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3105
3106 elf_append_rel (output_bfd, sreloc, &outrel);
3107
3108 if (GOT_TLS_GD_P (tls_type))
3109 {
3110 if (indx == 0)
3111 {
3112 BFD_ASSERT (! unresolved_reloc);
3113 bfd_put_32 (output_bfd,
3114 relocation - _bfd_x86_elf_dtpoff_base (info),
3115 htab->elf.sgot->contents + off + 4);
3116 }
3117 else
3118 {
3119 bfd_put_32 (output_bfd, 0,
3120 htab->elf.sgot->contents + off + 4);
3121 outrel.r_info = ELF32_R_INFO (indx,
3122 R_386_TLS_DTPOFF32);
3123 outrel.r_offset += 4;
3124 elf_append_rel (output_bfd, sreloc, &outrel);
3125 }
3126 }
3127 else if (tls_type == GOT_TLS_IE_BOTH)
3128 {
3129 bfd_put_32 (output_bfd,
3130 (indx == 0
3131 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3132 : 0),
3133 htab->elf.sgot->contents + off + 4);
3134 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3135 outrel.r_offset += 4;
3136 elf_append_rel (output_bfd, sreloc, &outrel);
3137 }
3138
3139 dr_done:
3140 if (h != NULL)
3141 h->got.offset |= 1;
3142 else
3143 local_got_offsets[r_symndx] |= 1;
3144 }
3145
3146 if (off >= (bfd_vma) -2
3147 && ! GOT_TLS_GDESC_P (tls_type))
3148 abort ();
3149 if (r_type_tls == R_386_TLS_GOTDESC
3150 || r_type_tls == R_386_TLS_DESC_CALL)
3151 {
3152 relocation = htab->sgotplt_jump_table_size + offplt;
3153 unresolved_reloc = FALSE;
3154 }
3155 else if (r_type_tls == r_type)
3156 {
3157 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3158 + htab->elf.sgotplt->output_offset;
3159 relocation = htab->elf.sgot->output_section->vma
3160 + htab->elf.sgot->output_offset + off - g_o_t;
3161 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3162 && tls_type == GOT_TLS_IE_BOTH)
3163 relocation += 4;
3164 if (r_type == R_386_TLS_IE)
3165 relocation += g_o_t;
3166 unresolved_reloc = FALSE;
3167 }
3168 else if (r_type == R_386_TLS_GD)
3169 {
3170 unsigned int val, type;
3171 bfd_vma roff;
3172
3173 /* GD->IE transition. */
3174 type = *(contents + rel->r_offset - 2);
3175 val = *(contents + rel->r_offset - 1);
3176 if (type == 0x04)
3177 {
3178 /* Change
3179 leal foo@tlsgd(,%ebx,1), %eax
3180 call ___tls_get_addr@PLT
3181 into:
3182 movl %gs:0, %eax
3183 subl $foo@gottpoff(%ebx), %eax. */
3184 val >>= 3;
3185 roff = rel->r_offset - 3;
3186 }
3187 else
3188 {
3189 /* Change
3190 leal foo@tlsgd(%ebx), %eax
3191 call ___tls_get_addr@PLT
3192 nop
3193 or
3194 leal foo@tlsgd(%reg), %eax
3195 call *___tls_get_addr@GOT(%reg)
3196 which may be converted to
3197 addr32 call ___tls_get_addr
3198 into:
3199 movl %gs:0, %eax;
3200 subl $foo@gottpoff(%reg), %eax. */
3201 roff = rel->r_offset - 2;
3202 }
3203 memcpy (contents + roff,
3204 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3205 contents[roff + 7] = 0x80 | (val & 7);
3206 /* If foo is used only with foo@gotntpoff(%reg) and
3207 foo@indntpoff, but not with foo@gottpoff(%reg), change
3208 subl $foo@gottpoff(%reg), %eax
3209 into:
3210 addl $foo@gotntpoff(%reg), %eax. */
3211 if (tls_type == GOT_TLS_IE_POS)
3212 contents[roff + 6] = 0x03;
3213 bfd_put_32 (output_bfd,
3214 htab->elf.sgot->output_section->vma
3215 + htab->elf.sgot->output_offset + off
3216 - htab->elf.sgotplt->output_section->vma
3217 - htab->elf.sgotplt->output_offset,
3218 contents + roff + 8);
3219 /* Skip R_386_PLT32 and R_386_GOT32X. */
3220 rel++;
3221 wrel++;
3222 continue;
3223 }
3224 else if (r_type == R_386_TLS_GOTDESC)
3225 {
3226 /* GDesc -> IE transition.
3227 It's originally something like:
3228 leal x@tlsdesc(%ebx), %eax
3229
3230 Change it to:
3231 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3232 or:
3233 movl x@gottpoff(%ebx), %eax # before negl %eax
3234
3235 Registers other than %eax may be set up here. */
3236
3237 bfd_vma roff;
3238
3239 /* First, make sure it's a leal adding ebx to a 32-bit
3240 offset into any register, although it's probably
3241 almost always going to be eax. */
3242 roff = rel->r_offset;
3243
3244 /* Now modify the instruction as appropriate. */
3245 /* To turn a leal into a movl in the form we use it, it
3246 suffices to change the first byte from 0x8d to 0x8b.
3247 aoliva FIXME: should we decide to keep the leal, all
3248 we have to do is remove the statement below, and
3249 adjust the relaxation of R_386_TLS_DESC_CALL. */
3250 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3251
3252 if (tls_type == GOT_TLS_IE_BOTH)
3253 off += 4;
3254
3255 bfd_put_32 (output_bfd,
3256 htab->elf.sgot->output_section->vma
3257 + htab->elf.sgot->output_offset + off
3258 - htab->elf.sgotplt->output_section->vma
3259 - htab->elf.sgotplt->output_offset,
3260 contents + roff);
3261 continue;
3262 }
3263 else if (r_type == R_386_TLS_DESC_CALL)
3264 {
3265 /* GDesc -> IE transition.
3266 It's originally:
3267 call *(%eax)
3268
3269 Change it to:
3270 xchg %ax,%ax
3271 or
3272 negl %eax
3273 depending on how we transformed the TLS_GOTDESC above.
3274 */
3275
3276 bfd_vma roff;
3277
3278 roff = rel->r_offset;
3279
3280 /* Now modify the instruction as appropriate. */
3281 if (tls_type != GOT_TLS_IE_NEG)
3282 {
3283 /* xchg %ax,%ax */
3284 bfd_put_8 (output_bfd, 0x66, contents + roff);
3285 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3286 }
3287 else
3288 {
3289 /* negl %eax */
3290 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3291 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3292 }
3293
3294 continue;
3295 }
3296 else
3297 BFD_ASSERT (FALSE);
3298 break;
3299
3300 case R_386_TLS_LDM:
3301 if (! elf_i386_tls_transition (info, input_bfd,
3302 input_section, contents,
3303 symtab_hdr, sym_hashes,
3304 &r_type, GOT_UNKNOWN, rel,
3305 relend, h, r_symndx, TRUE))
3306 return FALSE;
3307
3308 if (r_type != R_386_TLS_LDM)
3309 {
3310 /* LD->LE transition. Change
3311 leal foo@tlsldm(%ebx) %eax
3312 call ___tls_get_addr@PLT
3313 into:
3314 movl %gs:0, %eax
3315 nop
3316 leal 0(%esi,1), %esi
3317 or change
3318 leal foo@tlsldm(%reg) %eax
3319 call *___tls_get_addr@GOT(%reg)
3320 which may be converted to
3321 addr32 call ___tls_get_addr
3322 into:
3323 movl %gs:0, %eax
3324 leal 0(%esi), %esi */
3325 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3326 if (*(contents + rel->r_offset + 4) == 0xff
3327 || *(contents + rel->r_offset + 4) == 0x67)
3328 memcpy (contents + rel->r_offset - 2,
3329 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3330 else
3331 memcpy (contents + rel->r_offset - 2,
3332 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3333 /* Skip R_386_PC32/R_386_PLT32. */
3334 rel++;
3335 wrel++;
3336 continue;
3337 }
3338
3339 if (htab->elf.sgot == NULL)
3340 abort ();
3341
3342 off = htab->tls_ld_or_ldm_got.offset;
3343 if (off & 1)
3344 off &= ~1;
3345 else
3346 {
3347 Elf_Internal_Rela outrel;
3348
3349 if (htab->elf.srelgot == NULL)
3350 abort ();
3351
3352 outrel.r_offset = (htab->elf.sgot->output_section->vma
3353 + htab->elf.sgot->output_offset + off);
3354
3355 bfd_put_32 (output_bfd, 0,
3356 htab->elf.sgot->contents + off);
3357 bfd_put_32 (output_bfd, 0,
3358 htab->elf.sgot->contents + off + 4);
3359 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3360 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3361 htab->tls_ld_or_ldm_got.offset |= 1;
3362 }
3363 relocation = htab->elf.sgot->output_section->vma
3364 + htab->elf.sgot->output_offset + off
3365 - htab->elf.sgotplt->output_section->vma
3366 - htab->elf.sgotplt->output_offset;
3367 unresolved_reloc = FALSE;
3368 break;
3369
3370 case R_386_TLS_LDO_32:
3371 if (!bfd_link_executable (info)
3372 || (input_section->flags & SEC_CODE) == 0)
3373 relocation -= _bfd_x86_elf_dtpoff_base (info);
3374 else
3375 /* When converting LDO to LE, we must negate. */
3376 relocation = -elf_i386_tpoff (info, relocation);
3377 break;
3378
3379 case R_386_TLS_LE_32:
3380 case R_386_TLS_LE:
3381 if (!bfd_link_executable (info))
3382 {
3383 Elf_Internal_Rela outrel;
3384 asection *sreloc;
3385
3386 outrel.r_offset = rel->r_offset
3387 + input_section->output_section->vma
3388 + input_section->output_offset;
3389 if (h != NULL && h->dynindx != -1)
3390 indx = h->dynindx;
3391 else
3392 indx = 0;
3393 if (r_type == R_386_TLS_LE_32)
3394 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3395 else
3396 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3397 sreloc = elf_section_data (input_section)->sreloc;
3398 if (sreloc == NULL)
3399 abort ();
3400 elf_append_rel (output_bfd, sreloc, &outrel);
3401 if (indx)
3402 continue;
3403 else if (r_type == R_386_TLS_LE_32)
3404 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3405 else
3406 relocation -= _bfd_x86_elf_dtpoff_base (info);
3407 }
3408 else if (r_type == R_386_TLS_LE_32)
3409 relocation = elf_i386_tpoff (info, relocation);
3410 else
3411 relocation = -elf_i386_tpoff (info, relocation);
3412 break;
3413
3414 default:
3415 break;
3416 }
3417
3418 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3419 because such sections are not SEC_ALLOC and thus ld.so will
3420 not process them. */
3421 if (unresolved_reloc
3422 && !((input_section->flags & SEC_DEBUGGING) != 0
3423 && h->def_dynamic)
3424 && _bfd_elf_section_offset (output_bfd, info, input_section,
3425 rel->r_offset) != (bfd_vma) -1)
3426 {
3427 _bfd_error_handler
3428 /* xgettext:c-format */
3429 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3430 input_bfd,
3431 input_section,
3432 rel->r_offset,
3433 howto->name,
3434 h->root.root.string);
3435 return FALSE;
3436 }
3437
3438 do_relocation:
3439 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3440 contents, rel->r_offset,
3441 relocation, 0);
3442
3443 check_relocation_error:
3444 if (r != bfd_reloc_ok)
3445 {
3446 const char *name;
3447
3448 if (h != NULL)
3449 name = h->root.root.string;
3450 else
3451 {
3452 name = bfd_elf_string_from_elf_section (input_bfd,
3453 symtab_hdr->sh_link,
3454 sym->st_name);
3455 if (name == NULL)
3456 return FALSE;
3457 if (*name == '\0')
3458 name = bfd_section_name (input_bfd, sec);
3459 }
3460
3461 if (r == bfd_reloc_overflow)
3462 (*info->callbacks->reloc_overflow)
3463 (info, (h ? &h->root : NULL), name, howto->name,
3464 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3465 else
3466 {
3467 _bfd_error_handler
3468 /* xgettext:c-format */
3469 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3470 input_bfd, input_section,
3471 rel->r_offset, name, (int) r);
3472 return FALSE;
3473 }
3474 }
3475
3476 if (wrel != rel)
3477 *wrel = *rel;
3478 }
3479
3480 if (wrel != rel)
3481 {
3482 Elf_Internal_Shdr *rel_hdr;
3483 size_t deleted = rel - wrel;
3484
3485 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3486 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3487 if (rel_hdr->sh_size == 0)
3488 {
3489 /* It is too late to remove an empty reloc section. Leave
3490 one NONE reloc.
3491 ??? What is wrong with an empty section??? */
3492 rel_hdr->sh_size = rel_hdr->sh_entsize;
3493 deleted -= 1;
3494 }
3495 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3496 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3497 input_section->reloc_count -= deleted;
3498 }
3499
3500 return TRUE;
3501 }
3502
3503 /* Finish up dynamic symbol handling. We set the contents of various
3504 dynamic sections here. */
3505
3506 static bfd_boolean
3507 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3508 struct bfd_link_info *info,
3509 struct elf_link_hash_entry *h,
3510 Elf_Internal_Sym *sym)
3511 {
3512 struct elf_x86_link_hash_table *htab;
3513 unsigned plt_entry_size;
3514 struct elf_x86_link_hash_entry *eh;
3515 bfd_boolean local_undefweak;
3516 bfd_boolean use_plt_second;
3517
3518 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3519 if (htab == NULL)
3520 return FALSE;
3521
3522 plt_entry_size = htab->plt.plt_entry_size;
3523
3524 /* Use the second PLT section only if there is .plt section. */
3525 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3526
3527 eh = (struct elf_x86_link_hash_entry *) h;
3528 if (eh->no_finish_dynamic_symbol)
3529 abort ();
3530
3531 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3532 resolved undefined weak symbols in executable so that their
3533 references have value 0 at run-time. */
3534 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3535
3536 if (h->plt.offset != (bfd_vma) -1)
3537 {
3538 bfd_vma plt_index, plt_offset;
3539 bfd_vma got_offset;
3540 Elf_Internal_Rela rel;
3541 bfd_byte *loc;
3542 asection *plt, *resolved_plt, *gotplt, *relplt;
3543
3544 /* When building a static executable, use .iplt, .igot.plt and
3545 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3546 if (htab->elf.splt != NULL)
3547 {
3548 plt = htab->elf.splt;
3549 gotplt = htab->elf.sgotplt;
3550 relplt = htab->elf.srelplt;
3551 }
3552 else
3553 {
3554 plt = htab->elf.iplt;
3555 gotplt = htab->elf.igotplt;
3556 relplt = htab->elf.irelplt;
3557 }
3558
3559 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3560
3561 /* Get the index in the procedure linkage table which
3562 corresponds to this symbol. This is the index of this symbol
3563 in all the symbols for which we are making plt entries. The
3564 first entry in the procedure linkage table is reserved.
3565
3566 Get the offset into the .got table of the entry that
3567 corresponds to this function. Each .got entry is 4 bytes.
3568 The first three are reserved.
3569
3570 For static executables, we don't reserve anything. */
3571
3572 if (plt == htab->elf.splt)
3573 {
3574 got_offset = (h->plt.offset / plt_entry_size
3575 - htab->plt.has_plt0);
3576 got_offset = (got_offset + 3) * 4;
3577 }
3578 else
3579 {
3580 got_offset = h->plt.offset / plt_entry_size;
3581 got_offset = got_offset * 4;
3582 }
3583
3584 /* Fill in the entry in the procedure linkage table and update
3585 the first slot. */
3586 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3587 plt_entry_size);
3588
3589 if (use_plt_second)
3590 {
3591 const bfd_byte *plt_entry;
3592 if (bfd_link_pic (info))
3593 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3594 else
3595 plt_entry = htab->non_lazy_plt->plt_entry;
3596 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3597 plt_entry, htab->non_lazy_plt->plt_entry_size);
3598
3599 resolved_plt = htab->plt_second;
3600 plt_offset = eh->plt_second.offset;
3601 }
3602 else
3603 {
3604 resolved_plt = plt;
3605 plt_offset = h->plt.offset;
3606 }
3607
3608 if (! bfd_link_pic (info))
3609 {
3610 bfd_put_32 (output_bfd,
3611 (gotplt->output_section->vma
3612 + gotplt->output_offset
3613 + got_offset),
3614 resolved_plt->contents + plt_offset
3615 + htab->plt.plt_got_offset);
3616
3617 if (htab->target_os == is_vxworks)
3618 {
3619 int s, k, reloc_index;
3620
3621 /* Create the R_386_32 relocation referencing the GOT
3622 for this PLT entry. */
3623
3624 /* S: Current slot number (zero-based). */
3625 s = ((h->plt.offset - htab->plt.plt_entry_size)
3626 / htab->plt.plt_entry_size);
3627 /* K: Number of relocations for PLTResolve. */
3628 if (bfd_link_pic (info))
3629 k = PLTRESOLVE_RELOCS_SHLIB;
3630 else
3631 k = PLTRESOLVE_RELOCS;
3632 /* Skip the PLTresolve relocations, and the relocations for
3633 the other PLT slots. */
3634 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3635 loc = (htab->srelplt2->contents + reloc_index
3636 * sizeof (Elf32_External_Rel));
3637
3638 rel.r_offset = (plt->output_section->vma
3639 + plt->output_offset
3640 + h->plt.offset + 2),
3641 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3642 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3643
3644 /* Create the R_386_32 relocation referencing the beginning of
3645 the PLT for this GOT entry. */
3646 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3647 + htab->elf.sgotplt->output_offset
3648 + got_offset);
3649 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3650 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3651 loc + sizeof (Elf32_External_Rel));
3652 }
3653 }
3654 else
3655 {
3656 bfd_put_32 (output_bfd, got_offset,
3657 resolved_plt->contents + plt_offset
3658 + htab->plt.plt_got_offset);
3659 }
3660
3661 /* Fill in the entry in the global offset table. Leave the entry
3662 as zero for undefined weak symbol in PIE. No PLT relocation
3663 against undefined weak symbol in PIE. */
3664 if (!local_undefweak)
3665 {
3666 if (htab->plt.has_plt0)
3667 bfd_put_32 (output_bfd,
3668 (plt->output_section->vma
3669 + plt->output_offset
3670 + h->plt.offset
3671 + htab->lazy_plt->plt_lazy_offset),
3672 gotplt->contents + got_offset);
3673
3674 /* Fill in the entry in the .rel.plt section. */
3675 rel.r_offset = (gotplt->output_section->vma
3676 + gotplt->output_offset
3677 + got_offset);
3678 if (PLT_LOCAL_IFUNC_P (info, h))
3679 {
3680 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3681 h->root.root.string,
3682 h->root.u.def.section->owner);
3683
3684 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3685 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3686 in the .got.plt section. */
3687 bfd_put_32 (output_bfd,
3688 (h->root.u.def.value
3689 + h->root.u.def.section->output_section->vma
3690 + h->root.u.def.section->output_offset),
3691 gotplt->contents + got_offset);
3692 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3693 /* R_386_IRELATIVE comes last. */
3694 plt_index = htab->next_irelative_index--;
3695 }
3696 else
3697 {
3698 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3699 plt_index = htab->next_jump_slot_index++;
3700 }
3701
3702 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3703 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3704
3705 /* Don't fill the second and third slots in PLT entry for
3706 static executables nor without PLT0. */
3707 if (plt == htab->elf.splt && htab->plt.has_plt0)
3708 {
3709 bfd_put_32 (output_bfd,
3710 plt_index * sizeof (Elf32_External_Rel),
3711 plt->contents + h->plt.offset
3712 + htab->lazy_plt->plt_reloc_offset);
3713 bfd_put_32 (output_bfd,
3714 - (h->plt.offset
3715 + htab->lazy_plt->plt_plt_offset + 4),
3716 (plt->contents + h->plt.offset
3717 + htab->lazy_plt->plt_plt_offset));
3718 }
3719 }
3720 }
3721 else if (eh->plt_got.offset != (bfd_vma) -1)
3722 {
3723 bfd_vma got_offset, plt_offset;
3724 asection *plt, *got, *gotplt;
3725 const bfd_byte *got_plt_entry;
3726
3727 /* Set the entry in the GOT procedure linkage table. */
3728 plt = htab->plt_got;
3729 got = htab->elf.sgot;
3730 gotplt = htab->elf.sgotplt;
3731 got_offset = h->got.offset;
3732
3733 if (got_offset == (bfd_vma) -1
3734 || plt == NULL
3735 || got == NULL
3736 || gotplt == NULL)
3737 abort ();
3738
3739 /* Fill in the entry in the GOT procedure linkage table. */
3740 if (! bfd_link_pic (info))
3741 {
3742 got_plt_entry = htab->non_lazy_plt->plt_entry;
3743 got_offset += got->output_section->vma + got->output_offset;
3744 }
3745 else
3746 {
3747 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3748 got_offset += (got->output_section->vma
3749 + got->output_offset
3750 - gotplt->output_section->vma
3751 - gotplt->output_offset);
3752 }
3753
3754 plt_offset = eh->plt_got.offset;
3755 memcpy (plt->contents + plt_offset, got_plt_entry,
3756 htab->non_lazy_plt->plt_entry_size);
3757 bfd_put_32 (output_bfd, got_offset,
3758 (plt->contents + plt_offset
3759 + htab->non_lazy_plt->plt_got_offset));
3760 }
3761
3762 if (!local_undefweak
3763 && !h->def_regular
3764 && (h->plt.offset != (bfd_vma) -1
3765 || eh->plt_got.offset != (bfd_vma) -1))
3766 {
3767 /* Mark the symbol as undefined, rather than as defined in
3768 the .plt section. Leave the value if there were any
3769 relocations where pointer equality matters (this is a clue
3770 for the dynamic linker, to make function pointer
3771 comparisons work between an application and shared
3772 library), otherwise set it to zero. If a function is only
3773 called from a binary, there is no need to slow down
3774 shared libraries because of that. */
3775 sym->st_shndx = SHN_UNDEF;
3776 if (!h->pointer_equality_needed)
3777 sym->st_value = 0;
3778 }
3779
3780 /* Don't generate dynamic GOT relocation against undefined weak
3781 symbol in executable. */
3782 if (h->got.offset != (bfd_vma) -1
3783 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3784 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3785 && !local_undefweak)
3786 {
3787 Elf_Internal_Rela rel;
3788 asection *relgot = htab->elf.srelgot;
3789
3790 /* This symbol has an entry in the global offset table. Set it
3791 up. */
3792
3793 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3794 abort ();
3795
3796 rel.r_offset = (htab->elf.sgot->output_section->vma
3797 + htab->elf.sgot->output_offset
3798 + (h->got.offset & ~(bfd_vma) 1));
3799
3800 /* If this is a static link, or it is a -Bsymbolic link and the
3801 symbol is defined locally or was forced to be local because
3802 of a version file, we just want to emit a RELATIVE reloc.
3803 The entry in the global offset table will already have been
3804 initialized in the relocate_section function. */
3805 if (h->def_regular
3806 && h->type == STT_GNU_IFUNC)
3807 {
3808 if (h->plt.offset == (bfd_vma) -1)
3809 {
3810 /* STT_GNU_IFUNC is referenced without PLT. */
3811 if (htab->elf.splt == NULL)
3812 {
3813 /* use .rel[a].iplt section to store .got relocations
3814 in static executable. */
3815 relgot = htab->elf.irelplt;
3816 }
3817 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3818 {
3819 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3820 h->root.root.string,
3821 h->root.u.def.section->owner);
3822
3823 bfd_put_32 (output_bfd,
3824 (h->root.u.def.value
3825 + h->root.u.def.section->output_section->vma
3826 + h->root.u.def.section->output_offset),
3827 htab->elf.sgot->contents + h->got.offset);
3828 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3829 }
3830 else
3831 goto do_glob_dat;
3832 }
3833 else if (bfd_link_pic (info))
3834 {
3835 /* Generate R_386_GLOB_DAT. */
3836 goto do_glob_dat;
3837 }
3838 else
3839 {
3840 asection *plt;
3841 bfd_vma plt_offset;
3842
3843 if (!h->pointer_equality_needed)
3844 abort ();
3845
3846 /* For non-shared object, we can't use .got.plt, which
3847 contains the real function addres if we need pointer
3848 equality. We load the GOT entry with the PLT entry. */
3849 if (htab->plt_second != NULL)
3850 {
3851 plt = htab->plt_second;
3852 plt_offset = eh->plt_second.offset;
3853 }
3854 else
3855 {
3856 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3857 plt_offset = h->plt.offset;
3858 }
3859 bfd_put_32 (output_bfd,
3860 (plt->output_section->vma
3861 + plt->output_offset + plt_offset),
3862 htab->elf.sgot->contents + h->got.offset);
3863 return TRUE;
3864 }
3865 }
3866 else if (bfd_link_pic (info)
3867 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3868 {
3869 BFD_ASSERT((h->got.offset & 1) != 0);
3870 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3871 }
3872 else
3873 {
3874 BFD_ASSERT((h->got.offset & 1) == 0);
3875 do_glob_dat:
3876 bfd_put_32 (output_bfd, (bfd_vma) 0,
3877 htab->elf.sgot->contents + h->got.offset);
3878 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3879 }
3880
3881 elf_append_rel (output_bfd, relgot, &rel);
3882 }
3883
3884 if (h->needs_copy)
3885 {
3886 Elf_Internal_Rela rel;
3887 asection *s;
3888
3889 /* This symbol needs a copy reloc. Set it up. */
3890 VERIFY_COPY_RELOC (h, htab)
3891
3892 rel.r_offset = (h->root.u.def.value
3893 + h->root.u.def.section->output_section->vma
3894 + h->root.u.def.section->output_offset);
3895 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3896 if (h->root.u.def.section == htab->elf.sdynrelro)
3897 s = htab->elf.sreldynrelro;
3898 else
3899 s = htab->elf.srelbss;
3900 elf_append_rel (output_bfd, s, &rel);
3901 }
3902
3903 return TRUE;
3904 }
3905
3906 /* Finish up local dynamic symbol handling. We set the contents of
3907 various dynamic sections here. */
3908
3909 static bfd_boolean
3910 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3911 {
3912 struct elf_link_hash_entry *h
3913 = (struct elf_link_hash_entry *) *slot;
3914 struct bfd_link_info *info
3915 = (struct bfd_link_info *) inf;
3916
3917 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3918 h, NULL);
3919 }
3920
3921 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3922 here since undefined weak symbol may not be dynamic and may not be
3923 called for elf_i386_finish_dynamic_symbol. */
3924
3925 static bfd_boolean
3926 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3927 void *inf)
3928 {
3929 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3930 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3931
3932 if (h->root.type != bfd_link_hash_undefweak
3933 || h->dynindx != -1)
3934 return TRUE;
3935
3936 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3937 info, h, NULL);
3938 }
3939
3940 /* Used to decide how to sort relocs in an optimal manner for the
3941 dynamic linker, before writing them out. */
3942
3943 static enum elf_reloc_type_class
3944 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3945 const asection *rel_sec ATTRIBUTE_UNUSED,
3946 const Elf_Internal_Rela *rela)
3947 {
3948 bfd *abfd = info->output_bfd;
3949 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3950 struct elf_link_hash_table *htab = elf_hash_table (info);
3951
3952 if (htab->dynsym != NULL
3953 && htab->dynsym->contents != NULL)
3954 {
3955 /* Check relocation against STT_GNU_IFUNC symbol if there are
3956 dynamic symbols. */
3957 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3958 if (r_symndx != STN_UNDEF)
3959 {
3960 Elf_Internal_Sym sym;
3961 if (!bed->s->swap_symbol_in (abfd,
3962 (htab->dynsym->contents
3963 + r_symndx * sizeof (Elf32_External_Sym)),
3964 0, &sym))
3965 abort ();
3966
3967 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3968 return reloc_class_ifunc;
3969 }
3970 }
3971
3972 switch (ELF32_R_TYPE (rela->r_info))
3973 {
3974 case R_386_IRELATIVE:
3975 return reloc_class_ifunc;
3976 case R_386_RELATIVE:
3977 return reloc_class_relative;
3978 case R_386_JUMP_SLOT:
3979 return reloc_class_plt;
3980 case R_386_COPY:
3981 return reloc_class_copy;
3982 default:
3983 return reloc_class_normal;
3984 }
3985 }
3986
3987 /* Finish up the dynamic sections. */
3988
3989 static bfd_boolean
3990 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3991 struct bfd_link_info *info)
3992 {
3993 struct elf_x86_link_hash_table *htab;
3994
3995 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3996 if (htab == NULL)
3997 return FALSE;
3998
3999 if (!htab->elf.dynamic_sections_created)
4000 return TRUE;
4001
4002 if (htab->elf.splt && htab->elf.splt->size > 0)
4003 {
4004 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4005 really seem like the right value. */
4006 elf_section_data (htab->elf.splt->output_section)
4007 ->this_hdr.sh_entsize = 4;
4008
4009 if (htab->plt.has_plt0)
4010 {
4011 /* Fill in the special first entry in the procedure linkage
4012 table. */
4013 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4014 htab->lazy_plt->plt0_entry_size);
4015 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4016 htab->plt0_pad_byte,
4017 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4018 if (!bfd_link_pic (info))
4019 {
4020 bfd_put_32 (output_bfd,
4021 (htab->elf.sgotplt->output_section->vma
4022 + htab->elf.sgotplt->output_offset
4023 + 4),
4024 htab->elf.splt->contents
4025 + htab->lazy_plt->plt0_got1_offset);
4026 bfd_put_32 (output_bfd,
4027 (htab->elf.sgotplt->output_section->vma
4028 + htab->elf.sgotplt->output_offset
4029 + 8),
4030 htab->elf.splt->contents
4031 + htab->lazy_plt->plt0_got2_offset);
4032
4033 if (htab->target_os == is_vxworks)
4034 {
4035 Elf_Internal_Rela rel;
4036 int num_plts = (htab->elf.splt->size
4037 / htab->plt.plt_entry_size) - 1;
4038 unsigned char *p;
4039 asection *srelplt2 = htab->srelplt2;
4040
4041 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4042 + 4. On IA32 we use REL relocations so the
4043 addend goes in the PLT directly. */
4044 rel.r_offset = (htab->elf.splt->output_section->vma
4045 + htab->elf.splt->output_offset
4046 + htab->lazy_plt->plt0_got1_offset);
4047 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4048 R_386_32);
4049 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4050 srelplt2->contents);
4051 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4052 + 8. */
4053 rel.r_offset = (htab->elf.splt->output_section->vma
4054 + htab->elf.splt->output_offset
4055 + htab->lazy_plt->plt0_got2_offset);
4056 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4057 R_386_32);
4058 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4059 srelplt2->contents +
4060 sizeof (Elf32_External_Rel));
4061 /* Correct the .rel.plt.unloaded relocations. */
4062 p = srelplt2->contents;
4063 if (bfd_link_pic (info))
4064 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4065 else
4066 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4067
4068 for (; num_plts; num_plts--)
4069 {
4070 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4071 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4072 R_386_32);
4073 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4074 p += sizeof (Elf32_External_Rel);
4075
4076 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4077 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4078 R_386_32);
4079 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4080 p += sizeof (Elf32_External_Rel);
4081 }
4082 }
4083 }
4084 }
4085 }
4086
4087 /* Fill PLT entries for undefined weak symbols in PIE. */
4088 if (bfd_link_pie (info))
4089 bfd_hash_traverse (&info->hash->table,
4090 elf_i386_pie_finish_undefweak_symbol,
4091 info);
4092
4093 return TRUE;
4094 }
4095
4096 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4097 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4098 It has to be done before elf_link_sort_relocs is called so that
4099 dynamic relocations are properly sorted. */
4100
4101 static bfd_boolean
4102 elf_i386_output_arch_local_syms
4103 (bfd *output_bfd ATTRIBUTE_UNUSED,
4104 struct bfd_link_info *info,
4105 void *flaginfo ATTRIBUTE_UNUSED,
4106 int (*func) (void *, const char *,
4107 Elf_Internal_Sym *,
4108 asection *,
4109 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4110 {
4111 struct elf_x86_link_hash_table *htab
4112 = elf_x86_hash_table (info, I386_ELF_DATA);
4113 if (htab == NULL)
4114 return FALSE;
4115
4116 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4117 htab_traverse (htab->loc_hash_table,
4118 elf_i386_finish_local_dynamic_symbol,
4119 info);
4120
4121 return TRUE;
4122 }
4123
4124 /* Forward declaration. */
4125 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4126
4127 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4128 dynamic relocations. */
4129
4130 static long
4131 elf_i386_get_synthetic_symtab (bfd *abfd,
4132 long symcount ATTRIBUTE_UNUSED,
4133 asymbol **syms ATTRIBUTE_UNUSED,
4134 long dynsymcount,
4135 asymbol **dynsyms,
4136 asymbol **ret)
4137 {
4138 long count, i, n;
4139 int j;
4140 bfd_byte *plt_contents;
4141 long relsize;
4142 const struct elf_x86_lazy_plt_layout *lazy_plt;
4143 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4144 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4145 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4146 asection *plt;
4147 bfd_vma got_addr;
4148 enum elf_x86_plt_type plt_type;
4149 struct elf_x86_plt plts[] =
4150 {
4151 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4152 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4153 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4154 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4155 };
4156
4157 *ret = NULL;
4158
4159 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4160 return 0;
4161
4162 if (dynsymcount <= 0)
4163 return 0;
4164
4165 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4166 if (relsize <= 0)
4167 return -1;
4168
4169 non_lazy_plt = NULL;
4170 /* Silence GCC 6. */
4171 lazy_plt = NULL;
4172 non_lazy_ibt_plt = NULL;
4173 lazy_ibt_plt = NULL;
4174 switch (get_elf_x86_backend_data (abfd)->target_os)
4175 {
4176 case is_normal:
4177 non_lazy_plt = &elf_i386_non_lazy_plt;
4178 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4179 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4180 /* Fall through */
4181 case is_vxworks:
4182 lazy_plt = &elf_i386_lazy_plt;
4183 break;
4184 case is_nacl:
4185 lazy_plt = &elf_i386_nacl_plt;
4186 break;
4187 }
4188
4189 got_addr = 0;
4190
4191 count = 0;
4192 for (j = 0; plts[j].name != NULL; j++)
4193 {
4194 plt = bfd_get_section_by_name (abfd, plts[j].name);
4195 if (plt == NULL || plt->size == 0)
4196 continue;
4197
4198 /* Get the PLT section contents. */
4199 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4200 if (plt_contents == NULL)
4201 break;
4202 if (!bfd_get_section_contents (abfd, (asection *) plt,
4203 plt_contents, 0, plt->size))
4204 {
4205 free (plt_contents);
4206 break;
4207 }
4208
4209 /* Check what kind of PLT it is. */
4210 plt_type = plt_unknown;
4211 if (plts[j].type == plt_unknown
4212 && (plt->size >= (lazy_plt->plt0_entry_size
4213 + lazy_plt->plt_entry_size)))
4214 {
4215 /* Match lazy PLT first. */
4216 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4217 lazy_plt->plt0_got1_offset) == 0)
4218 {
4219 /* The fist entry in the lazy IBT PLT is the same as the
4220 normal lazy PLT. */
4221 if (lazy_ibt_plt != NULL
4222 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4223 lazy_ibt_plt->plt_entry,
4224 lazy_ibt_plt->plt_got_offset) == 0))
4225 plt_type = plt_lazy | plt_second;
4226 else
4227 plt_type = plt_lazy;
4228 }
4229 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4230 lazy_plt->plt0_got1_offset) == 0)
4231 {
4232 /* The fist entry in the PIC lazy IBT PLT is the same as
4233 the normal PIC lazy PLT. */
4234 if (lazy_ibt_plt != NULL
4235 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4236 lazy_ibt_plt->pic_plt_entry,
4237 lazy_ibt_plt->plt_got_offset) == 0))
4238 plt_type = plt_lazy | plt_pic | plt_second;
4239 else
4240 plt_type = plt_lazy | plt_pic;
4241 }
4242 }
4243
4244 if (non_lazy_plt != NULL
4245 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4246 && plt->size >= non_lazy_plt->plt_entry_size)
4247 {
4248 /* Match non-lazy PLT. */
4249 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4250 non_lazy_plt->plt_got_offset) == 0)
4251 plt_type = plt_non_lazy;
4252 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4253 non_lazy_plt->plt_got_offset) == 0)
4254 plt_type = plt_pic;
4255 }
4256
4257 if ((non_lazy_ibt_plt != NULL)
4258 && (plt_type == plt_unknown || plt_type == plt_second)
4259 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4260 {
4261 if (memcmp (plt_contents,
4262 non_lazy_ibt_plt->plt_entry,
4263 non_lazy_ibt_plt->plt_got_offset) == 0)
4264 {
4265 /* Match IBT PLT. */
4266 plt_type = plt_second;
4267 non_lazy_plt = non_lazy_ibt_plt;
4268 }
4269 else if (memcmp (plt_contents,
4270 non_lazy_ibt_plt->pic_plt_entry,
4271 non_lazy_ibt_plt->plt_got_offset) == 0)
4272 {
4273 /* Match PIC IBT PLT. */
4274 plt_type = plt_second | plt_pic;
4275 non_lazy_plt = non_lazy_ibt_plt;
4276 }
4277 }
4278
4279 if (plt_type == plt_unknown)
4280 {
4281 free (plt_contents);
4282 continue;
4283 }
4284
4285 plts[j].sec = plt;
4286 plts[j].type = plt_type;
4287
4288 if ((plt_type & plt_lazy))
4289 {
4290 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4291 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4292 /* Skip PLT0 in lazy PLT. */
4293 i = 1;
4294 }
4295 else
4296 {
4297 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4298 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4299 i = 0;
4300 }
4301
4302 /* Skip lazy PLT when the second PLT is used. */
4303 if ((plt_type & (plt_lazy | plt_second))
4304 == (plt_lazy | plt_second))
4305 plts[j].count = 0;
4306 else
4307 {
4308 n = plt->size / plts[j].plt_entry_size;
4309 plts[j].count = n;
4310 count += n - i;
4311 }
4312
4313 plts[j].contents = plt_contents;
4314
4315 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4316 if ((plt_type & plt_pic))
4317 got_addr = (bfd_vma) -1;
4318 }
4319
4320 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4321 got_addr, plts, dynsyms,
4322 ret);
4323 }
4324
4325 /* Set up i386 GNU properties. Return the first relocatable ELF input
4326 with GNU properties if found. Otherwise, return NULL. */
4327
4328 static bfd *
4329 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4330 {
4331 struct elf_x86_init_table init_table;
4332
4333 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4334 {
4335 case is_normal:
4336 init_table.plt0_pad_byte = 0x0;
4337 init_table.lazy_plt = &elf_i386_lazy_plt;
4338 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4339 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4340 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4341 break;
4342 case is_vxworks:
4343 init_table.plt0_pad_byte = 0x90;
4344 init_table.lazy_plt = &elf_i386_lazy_plt;
4345 init_table.non_lazy_plt = NULL;
4346 init_table.lazy_ibt_plt = NULL;
4347 init_table.non_lazy_ibt_plt = NULL;
4348 break;
4349 case is_nacl:
4350 init_table.plt0_pad_byte = 0x90;
4351 init_table.lazy_plt = &elf_i386_nacl_plt;
4352 init_table.non_lazy_plt = NULL;
4353 init_table.lazy_ibt_plt = NULL;
4354 init_table.non_lazy_ibt_plt = NULL;
4355 break;
4356 }
4357
4358 init_table.r_info = elf32_r_info;
4359 init_table.r_sym = elf32_r_sym;
4360
4361 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4362 }
4363
4364 #define TARGET_LITTLE_SYM i386_elf32_vec
4365 #define TARGET_LITTLE_NAME "elf32-i386"
4366 #define ELF_ARCH bfd_arch_i386
4367 #define ELF_TARGET_ID I386_ELF_DATA
4368 #define ELF_MACHINE_CODE EM_386
4369 #define ELF_MAXPAGESIZE 0x1000
4370
4371 #define elf_backend_can_gc_sections 1
4372 #define elf_backend_can_refcount 1
4373 #define elf_backend_want_got_plt 1
4374 #define elf_backend_plt_readonly 1
4375 #define elf_backend_want_plt_sym 0
4376 #define elf_backend_got_header_size 12
4377 #define elf_backend_plt_alignment 4
4378 #define elf_backend_dtrel_excludes_plt 1
4379 #define elf_backend_extern_protected_data 1
4380 #define elf_backend_caches_rawsize 1
4381 #define elf_backend_want_dynrelro 1
4382
4383 /* Support RELA for objdump of prelink objects. */
4384 #define elf_info_to_howto elf_i386_info_to_howto_rel
4385 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4386
4387 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4388 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4389 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4390 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4391
4392 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4393 #define elf_backend_check_relocs elf_i386_check_relocs
4394 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4395 #define elf_backend_fake_sections elf_i386_fake_sections
4396 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4397 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4398 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4399 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4400 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4401 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4402 #define elf_backend_relocate_section elf_i386_relocate_section
4403 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4404 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4405
4406 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4407
4408 #include "elf32-target.h"
4409
4410 /* FreeBSD support. */
4411
4412 #undef TARGET_LITTLE_SYM
4413 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4414 #undef TARGET_LITTLE_NAME
4415 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4416 #undef ELF_OSABI
4417 #define ELF_OSABI ELFOSABI_FREEBSD
4418
4419 /* The kernel recognizes executables as valid only if they carry a
4420 "FreeBSD" label in the ELF header. So we put this label on all
4421 executables and (for simplicity) also all other object files. */
4422
4423 static void
4424 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4425 {
4426 _bfd_elf_post_process_headers (abfd, info);
4427
4428 #ifdef OLD_FREEBSD_ABI_LABEL
4429 {
4430 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4431 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4432 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4433 }
4434 #endif
4435 }
4436
4437 #undef elf_backend_post_process_headers
4438 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4439 #undef elf32_bed
4440 #define elf32_bed elf32_i386_fbsd_bed
4441
4442 #undef elf_backend_add_symbol_hook
4443
4444 #include "elf32-target.h"
4445
4446 /* Solaris 2. */
4447
4448 #undef TARGET_LITTLE_SYM
4449 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4450 #undef TARGET_LITTLE_NAME
4451 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4452
4453 #undef elf_backend_post_process_headers
4454
4455 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4456 objects won't be recognized. */
4457 #undef ELF_OSABI
4458
4459 #undef elf32_bed
4460 #define elf32_bed elf32_i386_sol2_bed
4461
4462 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4463 boundary. */
4464 #undef elf_backend_static_tls_alignment
4465 #define elf_backend_static_tls_alignment 8
4466
4467 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4468
4469 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4470 File, p.63. */
4471 #undef elf_backend_want_plt_sym
4472 #define elf_backend_want_plt_sym 1
4473
4474 #undef elf_backend_strtab_flags
4475 #define elf_backend_strtab_flags SHF_STRINGS
4476
4477 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4478 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4479 FALSE otherwise. ISECTION is the best guess matching section from the
4480 input bfd IBFD, but it might be NULL. */
4481
4482 static bfd_boolean
4483 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4484 bfd *obfd ATTRIBUTE_UNUSED,
4485 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4486 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4487 {
4488 /* PR 19938: FIXME: Need to add code for setting the sh_info
4489 and sh_link fields of Solaris specific section types. */
4490 return FALSE;
4491
4492 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4493 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4494
4495 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4496
4497 The following values should be set:
4498
4499 Type Link Info
4500 -----------------------------------------------------------------------------
4501 SHT_SUNW_ancillary The section header index of 0
4502 [0x6fffffee] the associated string table.
4503
4504 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4505 [0x6ffffff0] the associated symbol table. section header index of
4506 the associated
4507 SHT_SUNW_capchain table,
4508 otherwise 0.
4509
4510 SHT_SUNW_symsort The section header index of 0
4511 [0x6ffffff1] the associated symbol table.
4512
4513 SHT_SUNW_tlssort The section header index of 0
4514 [0x6ffffff2] the associated symbol table.
4515
4516 SHT_SUNW_LDYNSYM The section header index of One greater than the
4517 [0x6ffffff3] the associated string table. symbol table index of the
4518 This index is the same string last local symbol,
4519 table used by the SHT_DYNSYM STB_LOCAL. Since
4520 section. SHT_SUNW_LDYNSYM only
4521 contains local symbols,
4522 sh_info is equivalent to
4523 the number of symbols in
4524 the table.
4525
4526 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4527 [0x6ffffff5] the section header index of to named strings, the
4528 the associated section header index of
4529 SHT_SUNW_capinfo table, the associated string
4530 otherwise 0. table, otherwise 0.
4531
4532 SHT_SUNW_move The section header index of 0
4533 [0x6ffffffa] the associated symbol table.
4534
4535 SHT_SUNW_COMDAT 0 0
4536 [0x6ffffffb]
4537
4538 SHT_SUNW_syminfo The section header index of The section header index
4539 [0x6ffffffc] the associated symbol table. of the associated
4540 .dynamic section.
4541
4542 SHT_SUNW_verdef The section header index of The number of version
4543 [0x6ffffffd] the associated string table. definitions within the
4544 section.
4545
4546 SHT_SUNW_verneed The section header index of The number of version
4547 [0x6ffffffe] the associated string table. dependencies within the
4548 section.
4549
4550 SHT_SUNW_versym The section header index of 0
4551 [0x6fffffff] the associated symbol table. */
4552 }
4553
4554 #undef elf_backend_copy_special_section_fields
4555 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4556
4557 #include "elf32-target.h"
4558
4559 /* Intel MCU support. */
4560
4561 static bfd_boolean
4562 elf32_iamcu_elf_object_p (bfd *abfd)
4563 {
4564 /* Set the right machine number for an IAMCU elf32 file. */
4565 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4566 return TRUE;
4567 }
4568
4569 #undef TARGET_LITTLE_SYM
4570 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4571 #undef TARGET_LITTLE_NAME
4572 #define TARGET_LITTLE_NAME "elf32-iamcu"
4573 #undef ELF_ARCH
4574 #define ELF_ARCH bfd_arch_iamcu
4575
4576 #undef ELF_MACHINE_CODE
4577 #define ELF_MACHINE_CODE EM_IAMCU
4578
4579 #undef ELF_OSABI
4580
4581 #undef elf32_bed
4582 #define elf32_bed elf32_iamcu_bed
4583
4584 #undef elf_backend_object_p
4585 #define elf_backend_object_p elf32_iamcu_elf_object_p
4586
4587 #undef elf_backend_static_tls_alignment
4588
4589 #undef elf_backend_want_plt_sym
4590 #define elf_backend_want_plt_sym 0
4591
4592 #undef elf_backend_strtab_flags
4593 #undef elf_backend_copy_special_section_fields
4594
4595 #include "elf32-target.h"
4596
4597 /* Restore defaults. */
4598 #undef ELF_ARCH
4599 #define ELF_ARCH bfd_arch_i386
4600 #undef ELF_MACHINE_CODE
4601 #define ELF_MACHINE_CODE EM_386
4602
4603 /* Native Client support. */
4604
4605 #undef TARGET_LITTLE_SYM
4606 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4607 #undef TARGET_LITTLE_NAME
4608 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4609 #undef elf32_bed
4610 #define elf32_bed elf32_i386_nacl_bed
4611
4612 #undef ELF_MAXPAGESIZE
4613 #define ELF_MAXPAGESIZE 0x10000
4614
4615 /* Restore defaults. */
4616 #undef ELF_OSABI
4617 #undef elf_backend_want_plt_sym
4618 #define elf_backend_want_plt_sym 0
4619 #undef elf_backend_post_process_headers
4620 #undef elf_backend_static_tls_alignment
4621
4622 /* NaCl uses substantially different PLT entries for the same effects. */
4623
4624 #undef elf_backend_plt_alignment
4625 #define elf_backend_plt_alignment 5
4626 #define NACL_PLT_ENTRY_SIZE 64
4627 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4628
4629 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4630 {
4631 0xff, 0x35, /* pushl contents of address */
4632 0, 0, 0, 0, /* replaced with address of .got + 4. */
4633 0x8b, 0x0d, /* movl contents of address, %ecx */
4634 0, 0, 0, 0, /* replaced with address of .got + 8. */
4635 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4636 0xff, 0xe1 /* jmp *%ecx */
4637 };
4638
4639 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4640 {
4641 0x8b, 0x0d, /* movl contents of address, %ecx */
4642 0, 0, 0, 0, /* replaced with GOT slot address. */
4643 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4644 0xff, 0xe1, /* jmp *%ecx */
4645
4646 /* Pad to the next 32-byte boundary with nop instructions. */
4647 0x90,
4648 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4649 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4650
4651 /* Lazy GOT entries point here (32-byte aligned). */
4652 0x68, /* pushl immediate */
4653 0, 0, 0, 0, /* replaced with reloc offset. */
4654 0xe9, /* jmp relative */
4655 0, 0, 0, 0, /* replaced with offset to .plt. */
4656
4657 /* Pad to the next 32-byte boundary with nop instructions. */
4658 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4659 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4660 0x90, 0x90
4661 };
4662
4663 static const bfd_byte
4664 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4665 {
4666 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4667 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4668 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4669 0xff, 0xe1, /* jmp *%ecx */
4670
4671 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4672 so pad to that size with nop instructions. */
4673 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4674 };
4675
4676 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4677 {
4678 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4679 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4680 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4681 0xff, 0xe1, /* jmp *%ecx */
4682
4683 /* Pad to the next 32-byte boundary with nop instructions. */
4684 0x90,
4685 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4686 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4687
4688 /* Lazy GOT entries point here (32-byte aligned). */
4689 0x68, /* pushl immediate */
4690 0, 0, 0, 0, /* replaced with offset into relocation table. */
4691 0xe9, /* jmp relative */
4692 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4693
4694 /* Pad to the next 32-byte boundary with nop instructions. */
4695 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4696 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4697 0x90, 0x90
4698 };
4699
4700 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4701 {
4702 #if (PLT_CIE_LENGTH != 20 \
4703 || PLT_FDE_LENGTH != 36 \
4704 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4705 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4706 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4707 #endif
4708 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4709 0, 0, 0, 0, /* CIE ID */
4710 1, /* CIE version */
4711 'z', 'R', 0, /* Augmentation string */
4712 1, /* Code alignment factor */
4713 0x7c, /* Data alignment factor: -4 */
4714 8, /* Return address column */
4715 1, /* Augmentation size */
4716 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4717 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4718 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4719 DW_CFA_nop, DW_CFA_nop,
4720
4721 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4722 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4723 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4724 0, 0, 0, 0, /* .plt size goes here */
4725 0, /* Augmentation size */
4726 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4727 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4728 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4729 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4730 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4731 13, /* Block length */
4732 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4733 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4734 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4735 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4736 DW_CFA_nop, DW_CFA_nop
4737 };
4738
4739 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4740 {
4741 elf_i386_nacl_plt0_entry, /* plt0_entry */
4742 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4743 elf_i386_nacl_plt_entry, /* plt_entry */
4744 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4745 2, /* plt0_got1_offset */
4746 8, /* plt0_got2_offset */
4747 0, /* plt0_got2_insn_end */
4748 2, /* plt_got_offset */
4749 33, /* plt_reloc_offset */
4750 38, /* plt_plt_offset */
4751 0, /* plt_got_insn_size */
4752 0, /* plt_plt_insn_end */
4753 32, /* plt_lazy_offset */
4754 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4755 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4756 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4757 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4758 };
4759
4760 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4761 {
4762 is_nacl /* os */
4763 };
4764
4765 static bfd_boolean
4766 elf32_i386_nacl_elf_object_p (bfd *abfd)
4767 {
4768 /* Set the right machine number for a NaCl i386 ELF32 file. */
4769 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4770 return TRUE;
4771 }
4772
4773 #undef elf_backend_arch_data
4774 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4775
4776 #undef elf_backend_object_p
4777 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4778 #undef elf_backend_modify_segment_map
4779 #define elf_backend_modify_segment_map nacl_modify_segment_map
4780 #undef elf_backend_modify_program_headers
4781 #define elf_backend_modify_program_headers nacl_modify_program_headers
4782 #undef elf_backend_final_write_processing
4783 #define elf_backend_final_write_processing nacl_final_write_processing
4784
4785 #include "elf32-target.h"
4786
4787 /* Restore defaults. */
4788 #undef elf_backend_object_p
4789 #undef elf_backend_modify_segment_map
4790 #undef elf_backend_modify_program_headers
4791 #undef elf_backend_final_write_processing
4792
4793 /* VxWorks support. */
4794
4795 #undef TARGET_LITTLE_SYM
4796 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4797 #undef TARGET_LITTLE_NAME
4798 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4799 #undef ELF_OSABI
4800 #undef ELF_MAXPAGESIZE
4801 #define ELF_MAXPAGESIZE 0x1000
4802 #undef elf_backend_plt_alignment
4803 #define elf_backend_plt_alignment 4
4804
4805 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4806 {
4807 is_vxworks /* os */
4808 };
4809
4810 #undef elf_backend_arch_data
4811 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4812
4813 #undef elf_backend_relocs_compatible
4814 #undef elf_backend_add_symbol_hook
4815 #define elf_backend_add_symbol_hook \
4816 elf_vxworks_add_symbol_hook
4817 #undef elf_backend_link_output_symbol_hook
4818 #define elf_backend_link_output_symbol_hook \
4819 elf_vxworks_link_output_symbol_hook
4820 #undef elf_backend_emit_relocs
4821 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4822 #undef elf_backend_final_write_processing
4823 #define elf_backend_final_write_processing \
4824 elf_vxworks_final_write_processing
4825 #undef elf_backend_static_tls_alignment
4826
4827 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4828 define it. */
4829 #undef elf_backend_want_plt_sym
4830 #define elf_backend_want_plt_sym 1
4831
4832 #undef elf32_bed
4833 #define elf32_bed elf32_i386_vxworks_bed
4834
4835 #include "elf32-target.h"
GDB Binutils - Deliverables
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