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[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "elfxx-x86.h"
22 #include "elf-nacl.h"
23 #include "elf-vxworks.h"
24 #include "dwarf2.h"
25 #include "opcode/i386.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #ifdef DEBUG_GEN_RELOC
186 #define TRACE(str) \
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
188 #else
189 #define TRACE(str)
190 #endif
191
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
195 {
196 switch (code)
197 {
198 case BFD_RELOC_NONE:
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
201
202 case BFD_RELOC_32:
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
205
206 case BFD_RELOC_CTOR:
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
213
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
217
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
221
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
225
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
229
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
233
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
237
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
241
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
245
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
250
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
270
271 case BFD_RELOC_16:
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
274
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
278
279 case BFD_RELOC_8:
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
282
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
286
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
291
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_SIZE32:
313 TRACE ("BFD_RELOC_SIZE32");
314 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
315
316 case BFD_RELOC_386_TLS_GOTDESC:
317 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
318 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_DESC_CALL:
321 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
322 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
323
324 case BFD_RELOC_386_TLS_DESC:
325 TRACE ("BFD_RELOC_386_TLS_DESC");
326 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
327
328 case BFD_RELOC_386_IRELATIVE:
329 TRACE ("BFD_RELOC_386_IRELATIVE");
330 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
331
332 case BFD_RELOC_386_GOT32X:
333 TRACE ("BFD_RELOC_386_GOT32X");
334 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
335
336 case BFD_RELOC_VTABLE_INHERIT:
337 TRACE ("BFD_RELOC_VTABLE_INHERIT");
338 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
339
340 case BFD_RELOC_VTABLE_ENTRY:
341 TRACE ("BFD_RELOC_VTABLE_ENTRY");
342 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
343
344 default:
345 break;
346 }
347
348 TRACE ("Unknown");
349 return 0;
350 }
351
352 static reloc_howto_type *
353 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
354 const char *r_name)
355 {
356 unsigned int i;
357
358 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
359 if (elf_howto_table[i].name != NULL
360 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
361 return &elf_howto_table[i];
362
363 return NULL;
364 }
365
366 static reloc_howto_type *
367 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
368 {
369 unsigned int indx;
370
371 if ((indx = r_type) >= R_386_standard
372 && ((indx = r_type - R_386_ext_offset) - R_386_standard
373 >= R_386_ext - R_386_standard)
374 && ((indx = r_type - R_386_tls_offset) - R_386_ext
375 >= R_386_ext2 - R_386_ext)
376 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
377 >= R_386_vt - R_386_ext2))
378 {
379 /* xgettext:c-format */
380 _bfd_error_handler (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table [indx].type != r_type)
386 return NULL;
387 return &elf_howto_table[indx];
388 }
389
390 static void
391 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
392 arelent *cache_ptr,
393 Elf_Internal_Rela *dst)
394 {
395 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
396 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
397 }
398
399 /* Return whether a symbol name implies a local label. The UnixWare
400 2.1 cc generates temporary symbols that start with .X, so we
401 recognize them here. FIXME: do other SVR4 compilers also use .X?.
402 If so, we should move the .X recognition into
403 _bfd_elf_is_local_label_name. */
404
405 static bfd_boolean
406 elf_i386_is_local_label_name (bfd *abfd, const char *name)
407 {
408 if (name[0] == '.' && name[1] == 'X')
409 return TRUE;
410
411 return _bfd_elf_is_local_label_name (abfd, name);
412 }
413 \f
414 /* Support for core dump NOTE sections. */
415
416 static bfd_boolean
417 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
418 {
419 int offset;
420 size_t size;
421
422 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
423 {
424 int pr_version = bfd_get_32 (abfd, note->descdata);
425
426 if (pr_version != 1)
427 return FALSE;
428
429 /* pr_cursig */
430 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
431
432 /* pr_pid */
433 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
434
435 /* pr_reg */
436 offset = 28;
437 size = bfd_get_32 (abfd, note->descdata + 8);
438 }
439 else
440 {
441 switch (note->descsz)
442 {
443 default:
444 return FALSE;
445
446 case 144: /* Linux/i386 */
447 /* pr_cursig */
448 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
449
450 /* pr_pid */
451 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
452
453 /* pr_reg */
454 offset = 72;
455 size = 68;
456
457 break;
458 }
459 }
460
461 /* Make a ".reg/999" section. */
462 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
463 size, note->descpos + offset);
464 }
465
466 static bfd_boolean
467 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
468 {
469 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
470 {
471 int pr_version = bfd_get_32 (abfd, note->descdata);
472
473 if (pr_version != 1)
474 return FALSE;
475
476 elf_tdata (abfd)->core->program
477 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
478 elf_tdata (abfd)->core->command
479 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
480 }
481 else
482 {
483 switch (note->descsz)
484 {
485 default:
486 return FALSE;
487
488 case 124: /* Linux/i386 elf_prpsinfo. */
489 elf_tdata (abfd)->core->pid
490 = bfd_get_32 (abfd, note->descdata + 12);
491 elf_tdata (abfd)->core->program
492 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
493 elf_tdata (abfd)->core->command
494 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
495 }
496 }
497
498 /* Note that for some reason, a spurious space is tacked
499 onto the end of the args in some (at least one anyway)
500 implementations, so strip it off if it exists. */
501 {
502 char *command = elf_tdata (abfd)->core->command;
503 int n = strlen (command);
504
505 if (0 < n && command[n - 1] == ' ')
506 command[n - 1] = '\0';
507 }
508
509 return TRUE;
510 }
511 \f
512 /* Functions for the i386 ELF linker.
513
514 In order to gain some understanding of code in this file without
515 knowing all the intricate details of the linker, note the
516 following:
517
518 Functions named elf_i386_* are called by external routines, other
519 functions are only called locally. elf_i386_* functions appear
520 in this file more or less in the order in which they are called
521 from external routines. eg. elf_i386_check_relocs is called
522 early in the link process, elf_i386_finish_dynamic_sections is
523 one of the last functions. */
524
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
526
527 #define LAZY_PLT_ENTRY_SIZE 16
528
529 /* The size in bytes of an entry in the non-lazy procedure linkage
530 table. */
531
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
533
534 /* The first entry in an absolute lazy procedure linkage table looks
535 like this. See the SVR4 ABI i386 supplement to see how this works.
536 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
537
538 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
539 {
540 0xff, 0x35, /* pushl contents of address */
541 0, 0, 0, 0, /* replaced with address of .got + 4. */
542 0xff, 0x25, /* jmp indirect */
543 0, 0, 0, 0 /* replaced with address of .got + 8. */
544 };
545
546 /* Subsequent entries in an absolute lazy procedure linkage table look
547 like this. */
548
549 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
550 {
551 0xff, 0x25, /* jmp indirect */
552 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
553 0x68, /* pushl immediate */
554 0, 0, 0, 0, /* replaced with offset into relocation table. */
555 0xe9, /* jmp relative */
556 0, 0, 0, 0 /* replaced with offset to start of .plt. */
557 };
558
559 /* The first entry in a PIC lazy procedure linkage table look like
560 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
561 lazy_plt->plt0_pad_byte. */
562
563 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
564 {
565 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
566 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
567 };
568
569 /* Subsequent entries in a PIC lazy procedure linkage table look like
570 this. */
571
572 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
573 {
574 0xff, 0xa3, /* jmp *offset(%ebx) */
575 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
576 0x68, /* pushl immediate */
577 0, 0, 0, 0, /* replaced with offset into relocation table. */
578 0xe9, /* jmp relative */
579 0, 0, 0, 0 /* replaced with offset to start of .plt. */
580 };
581
582 /* Entries in the non-lazy procedure linkage table look like this. */
583
584 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
585 {
586 0xff, 0x25, /* jmp indirect */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x66, 0x90 /* xchg %ax,%ax */
589 };
590
591 /* Entries in the PIC non-lazy procedure linkage table look like
592 this. */
593
594 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
595 {
596 0xff, 0xa3, /* jmp *offset(%ebx) */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
599 };
600
601 /* The first entry in an absolute IBT-enabled lazy procedure linkage
602 table looks like this. */
603
604 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
605 {
606 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
607 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
608 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
609 };
610
611 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
612 table look like this. Subsequent entries for a PIC IBT-enabled lazy
613 procedure linkage table are the same. */
614
615 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
616 {
617 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
618 0x68, 0, 0, 0, 0, /* pushl immediate */
619 0xe9, 0, 0, 0, 0, /* jmp relative */
620 0x66, 0x90 /* xchg %ax,%ax */
621 };
622
623 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
624 look like. */
625
626 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
627 {
628 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
629 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
630 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
631 };
632
633 /* Entries for branches with IBT-enabled in the absolute non-lazey
634 procedure linkage table look like this. They have the same size
635 as the lazy PLT entry. */
636
637 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
638 {
639 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
640 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
641 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
642 };
643
644 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
646 PLT entry. */
647
648 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
649 {
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
653 };
654
655 /* .eh_frame covering the lazy .plt section. */
656
657 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
658 {
659 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
660 0, 0, 0, 0, /* CIE ID */
661 1, /* CIE version */
662 'z', 'R', 0, /* Augmentation string */
663 1, /* Code alignment factor */
664 0x7c, /* Data alignment factor */
665 8, /* Return address column */
666 1, /* Augmentation size */
667 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
668 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
669 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
670 DW_CFA_nop, DW_CFA_nop,
671
672 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
673 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
674 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
675 0, 0, 0, 0, /* .plt size goes here */
676 0, /* Augmentation size */
677 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
678 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
679 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
680 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
681 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
682 11, /* Block length */
683 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
684 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
685 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
686 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
687 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
688 };
689
690 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
691
692 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
693 {
694 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
695 0, 0, 0, 0, /* CIE ID */
696 1, /* CIE version */
697 'z', 'R', 0, /* Augmentation string */
698 1, /* Code alignment factor */
699 0x7c, /* Data alignment factor */
700 8, /* Return address column */
701 1, /* Augmentation size */
702 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
703 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
704 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
705 DW_CFA_nop, DW_CFA_nop,
706
707 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
708 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
709 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
710 0, 0, 0, 0, /* .plt size goes here */
711 0, /* Augmentation size */
712 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
713 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
714 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
715 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
716 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
717 11, /* Block length */
718 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
719 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
720 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
721 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
722 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
723 };
724
725 /* .eh_frame covering the non-lazy .plt section. */
726
727 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
728 {
729 #define PLT_GOT_FDE_LENGTH 16
730 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
731 0, 0, 0, 0, /* CIE ID */
732 1, /* CIE version */
733 'z', 'R', 0, /* Augmentation string */
734 1, /* Code alignment factor */
735 0x7c, /* Data alignment factor */
736 8, /* Return address column */
737 1, /* Augmentation size */
738 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
739 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
740 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
741 DW_CFA_nop, DW_CFA_nop,
742
743 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
744 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
745 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
746 0, 0, 0, 0, /* non-lazy .plt size goes here */
747 0, /* Augmentation size */
748 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
749 };
750
751 /* These are the standard parameters. */
752 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
753 {
754 elf_i386_lazy_plt0_entry, /* plt0_entry */
755 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
756 elf_i386_lazy_plt_entry, /* plt_entry */
757 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
758 2, /* plt0_got1_offset */
759 8, /* plt0_got2_offset */
760 0, /* plt0_got2_insn_end */
761 2, /* plt_got_offset */
762 7, /* plt_reloc_offset */
763 12, /* plt_plt_offset */
764 0, /* plt_got_insn_size */
765 0, /* plt_plt_insn_end */
766 6, /* plt_lazy_offset */
767 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
768 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
769 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
770 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
771 };
772
773 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
774 {
775 elf_i386_non_lazy_plt_entry, /* plt_entry */
776 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
777 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
778 2, /* plt_got_offset */
779 0, /* plt_got_insn_size */
780 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
781 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
782 };
783
784 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
785 {
786 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
787 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
788 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
789 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
790 2, /* plt0_got1_offset */
791 8, /* plt0_got2_offset */
792 0, /* plt0_got2_insn_end */
793 4+2, /* plt_got_offset */
794 4+1, /* plt_reloc_offset */
795 4+6, /* plt_plt_offset */
796 0, /* plt_got_insn_size */
797 0, /* plt_plt_insn_end */
798 0, /* plt_lazy_offset */
799 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
800 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
801 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
802 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
803 };
804
805 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
806 {
807 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
808 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
809 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
810 4+2, /* plt_got_offset */
811 0, /* plt_got_insn_size */
812 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
813 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
814 };
815 \f
816
817 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
818 for the PLTResolve stub and then for each PLT entry. */
819 #define PLTRESOLVE_RELOCS_SHLIB 0
820 #define PLTRESOLVE_RELOCS 2
821 #define PLT_NON_JUMP_SLOT_RELOCS 2
822
823 /* Architecture-specific backend data for i386. */
824
825 struct elf_i386_backend_data
826 {
827 /* Value used to fill the unused bytes of the first PLT entry. */
828 bfd_byte plt0_pad_byte;
829
830 /* Target system. */
831 enum
832 {
833 is_normal,
834 is_vxworks,
835 is_nacl
836 } os;
837 };
838
839 #define get_elf_i386_backend_data(abfd) \
840 ((const struct elf_i386_backend_data *) \
841 get_elf_backend_data (abfd)->arch_data)
842
843 /* These are the standard parameters. */
844 static const struct elf_i386_backend_data elf_i386_arch_bed =
845 {
846 0, /* plt0_pad_byte */
847 is_normal /* os */
848 };
849
850 #define elf_backend_arch_data &elf_i386_arch_bed
851
852 /* Return TRUE if the TLS access code sequence support transition
853 from R_TYPE. */
854
855 static bfd_boolean
856 elf_i386_check_tls_transition (asection *sec,
857 bfd_byte *contents,
858 Elf_Internal_Shdr *symtab_hdr,
859 struct elf_link_hash_entry **sym_hashes,
860 unsigned int r_type,
861 const Elf_Internal_Rela *rel,
862 const Elf_Internal_Rela *relend)
863 {
864 unsigned int val, type, reg;
865 unsigned long r_symndx;
866 struct elf_link_hash_entry *h;
867 bfd_vma offset;
868 bfd_byte *call;
869 bfd_boolean indirect_call;
870
871 offset = rel->r_offset;
872 switch (r_type)
873 {
874 case R_386_TLS_GD:
875 case R_386_TLS_LDM:
876 if (offset < 2 || (rel + 1) >= relend)
877 return FALSE;
878
879 indirect_call = FALSE;
880 call = contents + offset + 4;
881 val = *(call - 5);
882 type = *(call - 6);
883 if (r_type == R_386_TLS_GD)
884 {
885 /* Check transition from GD access model. Only
886 leal foo@tlsgd(,%ebx,1), %eax
887 call ___tls_get_addr@PLT
888 or
889 leal foo@tlsgd(%ebx) %eax
890 call ___tls_get_addr@PLT
891 nop
892 or
893 leal foo@tlsgd(%reg), %eax
894 call *___tls_get_addr@GOT(%reg)
895 which may be converted to
896 addr32 call ___tls_get_addr
897 can transit to different access model. */
898 if ((offset + 10) > sec->size
899 || (type != 0x8d && type != 0x04))
900 return FALSE;
901
902 if (type == 0x04)
903 {
904 /* leal foo@tlsgd(,%ebx,1), %eax
905 call ___tls_get_addr@PLT */
906 if (offset < 3)
907 return FALSE;
908
909 if (*(call - 7) != 0x8d
910 || val != 0x1d
911 || call[0] != 0xe8)
912 return FALSE;
913 }
914 else
915 {
916 /* This must be
917 leal foo@tlsgd(%ebx), %eax
918 call ___tls_get_addr@PLT
919 nop
920 or
921 leal foo@tlsgd(%reg), %eax
922 call *___tls_get_addr@GOT(%reg)
923 which may be converted to
924 addr32 call ___tls_get_addr
925
926 %eax can't be used as the GOT base register since it
927 is used to pass parameter to ___tls_get_addr. */
928 reg = val & 7;
929 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
930 return FALSE;
931
932 indirect_call = call[0] == 0xff;
933 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
934 && !(call[0] == 0x67 && call[1] == 0xe8)
935 && !(indirect_call
936 && (call[1] & 0xf8) == 0x90
937 && (call[1] & 0x7) == reg))
938 return FALSE;
939 }
940 }
941 else
942 {
943 /* Check transition from LD access model. Only
944 leal foo@tlsldm(%ebx), %eax
945 call ___tls_get_addr@PLT
946 or
947 leal foo@tlsldm(%reg), %eax
948 call *___tls_get_addr@GOT(%reg)
949 which may be converted to
950 addr32 call ___tls_get_addr
951 can transit to different access model. */
952 if (type != 0x8d || (offset + 9) > sec->size)
953 return FALSE;
954
955 /* %eax can't be used as the GOT base register since it is
956 used to pass parameter to ___tls_get_addr. */
957 reg = val & 7;
958 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
959 return FALSE;
960
961 indirect_call = call[0] == 0xff;
962 if (!(reg == 3 && call[0] == 0xe8)
963 && !(call[0] == 0x67 && call[1] == 0xe8)
964 && !(indirect_call
965 && (call[1] & 0xf8) == 0x90
966 && (call[1] & 0x7) == reg))
967 return FALSE;
968 }
969
970 r_symndx = ELF32_R_SYM (rel[1].r_info);
971 if (r_symndx < symtab_hdr->sh_info)
972 return FALSE;
973
974 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
975 if (h == NULL
976 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
977 return FALSE;
978 else if (indirect_call)
979 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
980 else
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
982 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
983
984 case R_386_TLS_IE:
985 /* Check transition from IE access model:
986 movl foo@indntpoff(%rip), %eax
987 movl foo@indntpoff(%rip), %reg
988 addl foo@indntpoff(%rip), %reg
989 */
990
991 if (offset < 1 || (offset + 4) > sec->size)
992 return FALSE;
993
994 /* Check "movl foo@tpoff(%rip), %eax" first. */
995 val = bfd_get_8 (abfd, contents + offset - 1);
996 if (val == 0xa1)
997 return TRUE;
998
999 if (offset < 2)
1000 return FALSE;
1001
1002 /* Check movl|addl foo@tpoff(%rip), %reg. */
1003 type = bfd_get_8 (abfd, contents + offset - 2);
1004 return ((type == 0x8b || type == 0x03)
1005 && (val & 0xc7) == 0x05);
1006
1007 case R_386_TLS_GOTIE:
1008 case R_386_TLS_IE_32:
1009 /* Check transition from {IE_32,GOTIE} access model:
1010 subl foo@{tpoff,gontoff}(%reg1), %reg2
1011 movl foo@{tpoff,gontoff}(%reg1), %reg2
1012 addl foo@{tpoff,gontoff}(%reg1), %reg2
1013 */
1014
1015 if (offset < 2 || (offset + 4) > sec->size)
1016 return FALSE;
1017
1018 val = bfd_get_8 (abfd, contents + offset - 1);
1019 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1020 return FALSE;
1021
1022 type = bfd_get_8 (abfd, contents + offset - 2);
1023 return type == 0x8b || type == 0x2b || type == 0x03;
1024
1025 case R_386_TLS_GOTDESC:
1026 /* Check transition from GDesc access model:
1027 leal x@tlsdesc(%ebx), %eax
1028
1029 Make sure it's a leal adding ebx to a 32-bit offset
1030 into any register, although it's probably almost always
1031 going to be eax. */
1032
1033 if (offset < 2 || (offset + 4) > sec->size)
1034 return FALSE;
1035
1036 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1037 return FALSE;
1038
1039 val = bfd_get_8 (abfd, contents + offset - 1);
1040 return (val & 0xc7) == 0x83;
1041
1042 case R_386_TLS_DESC_CALL:
1043 /* Check transition from GDesc access model:
1044 call *x@tlsdesc(%eax)
1045 */
1046 if (offset + 2 <= sec->size)
1047 {
1048 /* Make sure that it's a call *x@tlsdesc(%eax). */
1049 call = contents + offset;
1050 return call[0] == 0xff && call[1] == 0x10;
1051 }
1052
1053 return FALSE;
1054
1055 default:
1056 abort ();
1057 }
1058 }
1059
1060 /* Return TRUE if the TLS access transition is OK or no transition
1061 will be performed. Update R_TYPE if there is a transition. */
1062
1063 static bfd_boolean
1064 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1065 asection *sec, bfd_byte *contents,
1066 Elf_Internal_Shdr *symtab_hdr,
1067 struct elf_link_hash_entry **sym_hashes,
1068 unsigned int *r_type, int tls_type,
1069 const Elf_Internal_Rela *rel,
1070 const Elf_Internal_Rela *relend,
1071 struct elf_link_hash_entry *h,
1072 unsigned long r_symndx,
1073 bfd_boolean from_relocate_section)
1074 {
1075 unsigned int from_type = *r_type;
1076 unsigned int to_type = from_type;
1077 bfd_boolean check = TRUE;
1078
1079 /* Skip TLS transition for functions. */
1080 if (h != NULL
1081 && (h->type == STT_FUNC
1082 || h->type == STT_GNU_IFUNC))
1083 return TRUE;
1084
1085 switch (from_type)
1086 {
1087 case R_386_TLS_GD:
1088 case R_386_TLS_GOTDESC:
1089 case R_386_TLS_DESC_CALL:
1090 case R_386_TLS_IE_32:
1091 case R_386_TLS_IE:
1092 case R_386_TLS_GOTIE:
1093 if (bfd_link_executable (info))
1094 {
1095 if (h == NULL)
1096 to_type = R_386_TLS_LE_32;
1097 else if (from_type != R_386_TLS_IE
1098 && from_type != R_386_TLS_GOTIE)
1099 to_type = R_386_TLS_IE_32;
1100 }
1101
1102 /* When we are called from elf_i386_relocate_section, there may
1103 be additional transitions based on TLS_TYPE. */
1104 if (from_relocate_section)
1105 {
1106 unsigned int new_to_type = to_type;
1107
1108 if (bfd_link_executable (info)
1109 && h != NULL
1110 && h->dynindx == -1
1111 && (tls_type & GOT_TLS_IE))
1112 new_to_type = R_386_TLS_LE_32;
1113
1114 if (to_type == R_386_TLS_GD
1115 || to_type == R_386_TLS_GOTDESC
1116 || to_type == R_386_TLS_DESC_CALL)
1117 {
1118 if (tls_type == GOT_TLS_IE_POS)
1119 new_to_type = R_386_TLS_GOTIE;
1120 else if (tls_type & GOT_TLS_IE)
1121 new_to_type = R_386_TLS_IE_32;
1122 }
1123
1124 /* We checked the transition before when we were called from
1125 elf_i386_check_relocs. We only want to check the new
1126 transition which hasn't been checked before. */
1127 check = new_to_type != to_type && from_type == to_type;
1128 to_type = new_to_type;
1129 }
1130
1131 break;
1132
1133 case R_386_TLS_LDM:
1134 if (bfd_link_executable (info))
1135 to_type = R_386_TLS_LE_32;
1136 break;
1137
1138 default:
1139 return TRUE;
1140 }
1141
1142 /* Return TRUE if there is no transition. */
1143 if (from_type == to_type)
1144 return TRUE;
1145
1146 /* Check if the transition can be performed. */
1147 if (check
1148 && ! elf_i386_check_tls_transition (sec, contents,
1149 symtab_hdr, sym_hashes,
1150 from_type, rel, relend))
1151 {
1152 reloc_howto_type *from, *to;
1153 const char *name;
1154
1155 from = elf_i386_rtype_to_howto (abfd, from_type);
1156 to = elf_i386_rtype_to_howto (abfd, to_type);
1157
1158 if (h)
1159 name = h->root.root.string;
1160 else
1161 {
1162 struct elf_x86_link_hash_table *htab;
1163
1164 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1165 if (htab == NULL)
1166 name = "*unknown*";
1167 else
1168 {
1169 Elf_Internal_Sym *isym;
1170
1171 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1172 abfd, r_symndx);
1173 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1174 }
1175 }
1176
1177 _bfd_error_handler
1178 /* xgettext:c-format */
1179 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1180 "in section `%A' failed"),
1181 abfd, from->name, to->name, name,
1182 rel->r_offset, sec);
1183 bfd_set_error (bfd_error_bad_value);
1184 return FALSE;
1185 }
1186
1187 *r_type = to_type;
1188 return TRUE;
1189 }
1190
1191 /* With the local symbol, foo, we convert
1192 mov foo@GOT[(%reg1)], %reg2
1193 to
1194 lea foo[@GOTOFF(%reg1)], %reg2
1195 and convert
1196 call/jmp *foo@GOT[(%reg)]
1197 to
1198 nop call foo/jmp foo nop
1199 When PIC is false, convert
1200 test %reg1, foo@GOT[(%reg2)]
1201 to
1202 test $foo, %reg1
1203 and convert
1204 binop foo@GOT[(%reg1)], %reg2
1205 to
1206 binop $foo, %reg2
1207 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1208 instructions. */
1209
1210 static
1211 bfd_boolean
1212 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1213 bfd_byte *contents,
1214 unsigned int *r_type_p,
1215 Elf_Internal_Rela *irel,
1216 struct elf_link_hash_entry *h,
1217 struct bfd_link_info *link_info)
1218 {
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1221 unsigned int modrm;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1225 unsigned int nop;
1226 bfd_vma nop_offset;
1227 bfd_boolean is_pic;
1228 bfd_boolean to_reloc_32;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bfd_boolean local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1234
1235 if (roff < 2)
1236 return TRUE;
1237
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1240 if (addend != 0)
1241 return TRUE;
1242
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 is_pic = bfd_link_pic (link_info);
1245
1246 r_type = *r_type_p;
1247 r_symndx = ELF32_R_SYM (irel->r_info);
1248
1249 modrm = bfd_get_8 (abfd, contents + roff - 1);
1250 baseless = (modrm & 0xc7) == 0x5;
1251
1252 if (baseless && is_pic)
1253 {
1254 /* For PIC, disallow R_386_GOT32X without a base register
1255 since we don't know what the GOT base is. */
1256 const char *name;
1257
1258 if (h == NULL)
1259 {
1260 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1261 r_symndx);
1262 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1263 }
1264 else
1265 name = h->root.root.string;
1266
1267 _bfd_error_handler
1268 /* xgettext:c-format */
1269 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1270 " register can not be used when making a shared object"),
1271 abfd, name);
1272 return FALSE;
1273 }
1274
1275 opcode = bfd_get_8 (abfd, contents + roff - 2);
1276
1277 /* Convert to R_386_32 if PIC is false or there is no base
1278 register. */
1279 to_reloc_32 = !is_pic || baseless;
1280
1281 eh = elf_x86_hash_entry (h);
1282
1283 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1284 reloc. */
1285 if (h == NULL)
1286 {
1287 if (opcode == 0x0ff)
1288 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1289 goto convert_branch;
1290 else
1291 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1292 "test %reg1, foo@GOT(%reg2)" and
1293 "binop foo@GOT[(%reg1)], %reg2". */
1294 goto convert_load;
1295 }
1296
1297 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1298 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1299
1300 /* Undefined weak symbol is only bound locally in executable
1301 and its reference is resolved as 0. */
1302 if (h->root.type == bfd_link_hash_undefweak
1303 && !eh->linker_def
1304 && local_ref)
1305 {
1306 if (opcode == 0xff)
1307 {
1308 /* No direct branch to 0 for PIC. */
1309 if (is_pic)
1310 return TRUE;
1311 else
1312 goto convert_branch;
1313 }
1314 else
1315 {
1316 /* We can convert load of address 0 to R_386_32. */
1317 to_reloc_32 = TRUE;
1318 goto convert_load;
1319 }
1320 }
1321
1322 if (opcode == 0xff)
1323 {
1324 /* We have "call/jmp *foo@GOT[(%reg)]". */
1325 if ((h->root.type == bfd_link_hash_defined
1326 || h->root.type == bfd_link_hash_defweak)
1327 && local_ref)
1328 {
1329 /* The function is locally defined. */
1330 convert_branch:
1331 /* Convert R_386_GOT32X to R_386_PC32. */
1332 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1333 {
1334 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1335 is a nop prefix. */
1336 modrm = 0xe8;
1337 /* To support TLS optimization, always use addr32 prefix
1338 for "call *___tls_get_addr@GOT(%reg)". */
1339 if (eh && eh->tls_get_addr)
1340 {
1341 nop = 0x67;
1342 nop_offset = irel->r_offset - 2;
1343 }
1344 else
1345 {
1346 nop = link_info->call_nop_byte;
1347 if (link_info->call_nop_as_suffix)
1348 {
1349 nop_offset = roff + 3;
1350 irel->r_offset -= 1;
1351 }
1352 else
1353 nop_offset = roff - 2;
1354 }
1355 }
1356 else
1357 {
1358 /* Convert to "jmp foo nop". */
1359 modrm = 0xe9;
1360 nop = NOP_OPCODE;
1361 nop_offset = roff + 3;
1362 irel->r_offset -= 1;
1363 }
1364
1365 bfd_put_8 (abfd, nop, contents + nop_offset);
1366 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1367 /* When converting to PC-relative relocation, we
1368 need to adjust addend by -4. */
1369 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1370 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1371 *r_type_p = R_386_PC32;
1372 }
1373 }
1374 else
1375 {
1376 /* We have "mov foo@GOT[(%re1g)], %reg2",
1377 "test %reg1, foo@GOT(%reg2)" and
1378 "binop foo@GOT[(%reg1)], %reg2".
1379
1380 Avoid optimizing _DYNAMIC since ld.so may use its
1381 link-time address. */
1382 if (h == htab->elf.hdynamic)
1383 return TRUE;
1384
1385 /* def_regular is set by an assignment in a linker script in
1386 bfd_elf_record_link_assignment. start_stop is set on
1387 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1388 if (h->start_stop
1389 || eh->linker_def
1390 || ((h->def_regular
1391 || h->root.type == bfd_link_hash_defined
1392 || h->root.type == bfd_link_hash_defweak)
1393 && local_ref))
1394 {
1395 convert_load:
1396 if (opcode == 0x8b)
1397 {
1398 if (to_reloc_32)
1399 {
1400 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1401 "mov $foo, %reg2" with R_386_32. */
1402 r_type = R_386_32;
1403 modrm = 0xc0 | (modrm & 0x38) >> 3;
1404 bfd_put_8 (abfd, modrm, contents + roff - 1);
1405 opcode = 0xc7;
1406 }
1407 else
1408 {
1409 /* Convert "mov foo@GOT(%reg1), %reg2" to
1410 "lea foo@GOTOFF(%reg1), %reg2". */
1411 r_type = R_386_GOTOFF;
1412 opcode = 0x8d;
1413 }
1414 }
1415 else
1416 {
1417 /* Only R_386_32 is supported. */
1418 if (!to_reloc_32)
1419 return TRUE;
1420
1421 if (opcode == 0x85)
1422 {
1423 /* Convert "test %reg1, foo@GOT(%reg2)" to
1424 "test $foo, %reg1". */
1425 modrm = 0xc0 | (modrm & 0x38) >> 3;
1426 opcode = 0xf7;
1427 }
1428 else
1429 {
1430 /* Convert "binop foo@GOT(%reg1), %reg2" to
1431 "binop $foo, %reg2". */
1432 modrm = (0xc0
1433 | (modrm & 0x38) >> 3
1434 | (opcode & 0x3c));
1435 opcode = 0x81;
1436 }
1437 bfd_put_8 (abfd, modrm, contents + roff - 1);
1438 r_type = R_386_32;
1439 }
1440
1441 bfd_put_8 (abfd, opcode, contents + roff - 2);
1442 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1443 *r_type_p = r_type;
1444 }
1445 }
1446
1447 return TRUE;
1448 }
1449
1450 /* Rename some of the generic section flags to better document how they
1451 are used here. */
1452 #define check_relocs_failed sec_flg0
1453
1454 /* Look through the relocs for a section during the first phase, and
1455 calculate needed space in the global offset table, procedure linkage
1456 table, and dynamic reloc sections. */
1457
1458 static bfd_boolean
1459 elf_i386_check_relocs (bfd *abfd,
1460 struct bfd_link_info *info,
1461 asection *sec,
1462 const Elf_Internal_Rela *relocs)
1463 {
1464 struct elf_x86_link_hash_table *htab;
1465 Elf_Internal_Shdr *symtab_hdr;
1466 struct elf_link_hash_entry **sym_hashes;
1467 const Elf_Internal_Rela *rel;
1468 const Elf_Internal_Rela *rel_end;
1469 asection *sreloc;
1470 bfd_byte *contents;
1471
1472 if (bfd_link_relocatable (info))
1473 return TRUE;
1474
1475 /* Don't do anything special with non-loaded, non-alloced sections.
1476 In particular, any relocs in such sections should not affect GOT
1477 and PLT reference counting (ie. we don't allow them to create GOT
1478 or PLT entries), there's no possibility or desire to optimize TLS
1479 relocs, and there's not much point in propagating relocs to shared
1480 libs that the dynamic linker won't relocate. */
1481 if ((sec->flags & SEC_ALLOC) == 0)
1482 return TRUE;
1483
1484 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1485 if (htab == NULL)
1486 {
1487 sec->check_relocs_failed = 1;
1488 return FALSE;
1489 }
1490
1491 BFD_ASSERT (is_x86_elf (abfd, htab));
1492
1493 /* Get the section contents. */
1494 if (elf_section_data (sec)->this_hdr.contents != NULL)
1495 contents = elf_section_data (sec)->this_hdr.contents;
1496 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1497 {
1498 sec->check_relocs_failed = 1;
1499 return FALSE;
1500 }
1501
1502 symtab_hdr = &elf_symtab_hdr (abfd);
1503 sym_hashes = elf_sym_hashes (abfd);
1504
1505 sreloc = NULL;
1506
1507 rel_end = relocs + sec->reloc_count;
1508 for (rel = relocs; rel < rel_end; rel++)
1509 {
1510 unsigned int r_type;
1511 unsigned int r_symndx;
1512 struct elf_link_hash_entry *h;
1513 struct elf_x86_link_hash_entry *eh;
1514 Elf_Internal_Sym *isym;
1515 const char *name;
1516 bfd_boolean size_reloc;
1517
1518 r_symndx = ELF32_R_SYM (rel->r_info);
1519 r_type = ELF32_R_TYPE (rel->r_info);
1520
1521 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1522 {
1523 /* xgettext:c-format */
1524 _bfd_error_handler (_("%B: bad symbol index: %d"),
1525 abfd, r_symndx);
1526 goto error_return;
1527 }
1528
1529 if (r_symndx < symtab_hdr->sh_info)
1530 {
1531 /* A local symbol. */
1532 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1533 abfd, r_symndx);
1534 if (isym == NULL)
1535 goto error_return;
1536
1537 /* Check relocation against local STT_GNU_IFUNC symbol. */
1538 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1539 {
1540 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1541 if (h == NULL)
1542 goto error_return;
1543
1544 /* Fake a STT_GNU_IFUNC symbol. */
1545 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1546 isym, NULL);
1547 h->type = STT_GNU_IFUNC;
1548 h->def_regular = 1;
1549 h->ref_regular = 1;
1550 h->forced_local = 1;
1551 h->root.type = bfd_link_hash_defined;
1552 }
1553 else
1554 h = NULL;
1555 }
1556 else
1557 {
1558 isym = NULL;
1559 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1560 while (h->root.type == bfd_link_hash_indirect
1561 || h->root.type == bfd_link_hash_warning)
1562 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1563 }
1564
1565 eh = (struct elf_x86_link_hash_entry *) h;
1566 if (h != NULL)
1567 {
1568 if (r_type == R_386_GOTOFF)
1569 eh->gotoff_ref = 1;
1570
1571 /* It is referenced by a non-shared object. */
1572 h->ref_regular = 1;
1573 h->root.non_ir_ref_regular = 1;
1574
1575 if (h->type == STT_GNU_IFUNC)
1576 elf_tdata (info->output_bfd)->has_gnu_symbols
1577 |= elf_gnu_symbol_ifunc;
1578 }
1579
1580 if (r_type == R_386_GOT32X
1581 && (h == NULL || h->type != STT_GNU_IFUNC))
1582 {
1583 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1584 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1585 &r_type, irel, h, info))
1586 goto error_return;
1587 }
1588
1589 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1590 symtab_hdr, sym_hashes,
1591 &r_type, GOT_UNKNOWN,
1592 rel, rel_end, h, r_symndx, FALSE))
1593 goto error_return;
1594
1595 switch (r_type)
1596 {
1597 case R_386_TLS_LDM:
1598 htab->tls_ld_or_ldm_got.refcount += 1;
1599 goto create_got;
1600
1601 case R_386_PLT32:
1602 /* This symbol requires a procedure linkage table entry. We
1603 actually build the entry in adjust_dynamic_symbol,
1604 because this might be a case of linking PIC code which is
1605 never referenced by a dynamic object, in which case we
1606 don't need to generate a procedure linkage table entry
1607 after all. */
1608
1609 /* If this is a local symbol, we resolve it directly without
1610 creating a procedure linkage table entry. */
1611 if (h == NULL)
1612 continue;
1613
1614 eh->has_got_reloc = 1;
1615 h->needs_plt = 1;
1616 h->plt.refcount += 1;
1617 break;
1618
1619 case R_386_SIZE32:
1620 size_reloc = TRUE;
1621 goto do_size;
1622
1623 case R_386_TLS_IE_32:
1624 case R_386_TLS_IE:
1625 case R_386_TLS_GOTIE:
1626 if (!bfd_link_executable (info))
1627 info->flags |= DF_STATIC_TLS;
1628 /* Fall through */
1629
1630 case R_386_GOT32:
1631 case R_386_GOT32X:
1632 case R_386_TLS_GD:
1633 case R_386_TLS_GOTDESC:
1634 case R_386_TLS_DESC_CALL:
1635 /* This symbol requires a global offset table entry. */
1636 {
1637 int tls_type, old_tls_type;
1638
1639 switch (r_type)
1640 {
1641 default:
1642 case R_386_GOT32:
1643 case R_386_GOT32X:
1644 tls_type = GOT_NORMAL;
1645 break;
1646 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1647 case R_386_TLS_GOTDESC:
1648 case R_386_TLS_DESC_CALL:
1649 tls_type = GOT_TLS_GDESC; break;
1650 case R_386_TLS_IE_32:
1651 if (ELF32_R_TYPE (rel->r_info) == r_type)
1652 tls_type = GOT_TLS_IE_NEG;
1653 else
1654 /* If this is a GD->IE transition, we may use either of
1655 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1656 tls_type = GOT_TLS_IE;
1657 break;
1658 case R_386_TLS_IE:
1659 case R_386_TLS_GOTIE:
1660 tls_type = GOT_TLS_IE_POS; break;
1661 }
1662
1663 if (h != NULL)
1664 {
1665 h->got.refcount += 1;
1666 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1667 }
1668 else
1669 {
1670 bfd_signed_vma *local_got_refcounts;
1671
1672 /* This is a global offset table entry for a local symbol. */
1673 local_got_refcounts = elf_local_got_refcounts (abfd);
1674 if (local_got_refcounts == NULL)
1675 {
1676 bfd_size_type size;
1677
1678 size = symtab_hdr->sh_info;
1679 size *= (sizeof (bfd_signed_vma)
1680 + sizeof (bfd_vma) + sizeof(char));
1681 local_got_refcounts = (bfd_signed_vma *)
1682 bfd_zalloc (abfd, size);
1683 if (local_got_refcounts == NULL)
1684 goto error_return;
1685 elf_local_got_refcounts (abfd) = local_got_refcounts;
1686 elf_x86_local_tlsdesc_gotent (abfd)
1687 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1688 elf_x86_local_got_tls_type (abfd)
1689 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1690 }
1691 local_got_refcounts[r_symndx] += 1;
1692 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1693 }
1694
1695 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1696 tls_type |= old_tls_type;
1697 /* If a TLS symbol is accessed using IE at least once,
1698 there is no point to use dynamic model for it. */
1699 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1700 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1701 || (tls_type & GOT_TLS_IE) == 0))
1702 {
1703 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1704 tls_type = old_tls_type;
1705 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1706 && GOT_TLS_GD_ANY_P (tls_type))
1707 tls_type |= old_tls_type;
1708 else
1709 {
1710 if (h)
1711 name = h->root.root.string;
1712 else
1713 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1714 NULL);
1715 _bfd_error_handler
1716 /* xgettext:c-format */
1717 (_("%B: `%s' accessed both as normal and "
1718 "thread local symbol"),
1719 abfd, name);
1720 bfd_set_error (bfd_error_bad_value);
1721 goto error_return;
1722 }
1723 }
1724
1725 if (old_tls_type != tls_type)
1726 {
1727 if (h != NULL)
1728 elf_x86_hash_entry (h)->tls_type = tls_type;
1729 else
1730 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1731 }
1732 }
1733 /* Fall through */
1734
1735 case R_386_GOTOFF:
1736 case R_386_GOTPC:
1737 create_got:
1738 if (r_type != R_386_TLS_IE)
1739 {
1740 if (eh != NULL)
1741 eh->has_got_reloc = 1;
1742 break;
1743 }
1744 /* Fall through */
1745
1746 case R_386_TLS_LE_32:
1747 case R_386_TLS_LE:
1748 if (eh != NULL)
1749 eh->has_got_reloc = 1;
1750 if (bfd_link_executable (info))
1751 break;
1752 info->flags |= DF_STATIC_TLS;
1753 goto do_relocation;
1754
1755 case R_386_32:
1756 case R_386_PC32:
1757 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1758 eh->has_non_got_reloc = 1;
1759 do_relocation:
1760 /* We are called after all symbols have been resolved. Only
1761 relocation against STT_GNU_IFUNC symbol must go through
1762 PLT. */
1763 if (h != NULL
1764 && (bfd_link_executable (info)
1765 || h->type == STT_GNU_IFUNC))
1766 {
1767 /* If this reloc is in a read-only section, we might
1768 need a copy reloc. We can't check reliably at this
1769 stage whether the section is read-only, as input
1770 sections have not yet been mapped to output sections.
1771 Tentatively set the flag for now, and correct in
1772 adjust_dynamic_symbol. */
1773 h->non_got_ref = 1;
1774
1775 /* We may need a .plt entry if the symbol is a function
1776 defined in a shared lib or is a STT_GNU_IFUNC function
1777 referenced from the code or read-only section. */
1778 if (!h->def_regular
1779 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1780 h->plt.refcount += 1;
1781
1782 if (r_type == R_386_PC32)
1783 {
1784 /* Since something like ".long foo - ." may be used
1785 as pointer, make sure that PLT is used if foo is
1786 a function defined in a shared library. */
1787 if ((sec->flags & SEC_CODE) == 0)
1788 h->pointer_equality_needed = 1;
1789 else if (h->type == STT_GNU_IFUNC
1790 && bfd_link_pic (info))
1791 {
1792 _bfd_error_handler
1793 /* xgettext:c-format */
1794 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1795 abfd, h->root.root.string);
1796 bfd_set_error (bfd_error_bad_value);
1797 goto error_return;
1798 }
1799 }
1800 else
1801 {
1802 h->pointer_equality_needed = 1;
1803 /* R_386_32 can be resolved at run-time. */
1804 if (r_type == R_386_32
1805 && (sec->flags & SEC_READONLY) == 0)
1806 eh->func_pointer_refcount += 1;
1807 }
1808 }
1809
1810 size_reloc = FALSE;
1811 do_size:
1812 /* If we are creating a shared library, and this is a reloc
1813 against a global symbol, or a non PC relative reloc
1814 against a local symbol, then we need to copy the reloc
1815 into the shared library. However, if we are linking with
1816 -Bsymbolic, we do not need to copy a reloc against a
1817 global symbol which is defined in an object we are
1818 including in the link (i.e., DEF_REGULAR is set). At
1819 this point we have not seen all the input files, so it is
1820 possible that DEF_REGULAR is not set now but will be set
1821 later (it is never cleared). In case of a weak definition,
1822 DEF_REGULAR may be cleared later by a strong definition in
1823 a shared library. We account for that possibility below by
1824 storing information in the relocs_copied field of the hash
1825 table entry. A similar situation occurs when creating
1826 shared libraries and symbol visibility changes render the
1827 symbol local.
1828
1829 If on the other hand, we are creating an executable, we
1830 may need to keep relocations for symbols satisfied by a
1831 dynamic library if we manage to avoid copy relocs for the
1832 symbol.
1833
1834 Generate dynamic pointer relocation against STT_GNU_IFUNC
1835 symbol in the non-code section. */
1836 if ((bfd_link_pic (info)
1837 && (r_type != R_386_PC32
1838 || (h != NULL
1839 && (! (bfd_link_pie (info)
1840 || SYMBOLIC_BIND (info, h))
1841 || h->root.type == bfd_link_hash_defweak
1842 || !h->def_regular))))
1843 || (h != NULL
1844 && h->type == STT_GNU_IFUNC
1845 && r_type == R_386_32
1846 && (sec->flags & SEC_CODE) == 0)
1847 || (ELIMINATE_COPY_RELOCS
1848 && !bfd_link_pic (info)
1849 && h != NULL
1850 && (h->root.type == bfd_link_hash_defweak
1851 || !h->def_regular)))
1852 {
1853 struct elf_dyn_relocs *p;
1854 struct elf_dyn_relocs **head;
1855
1856 /* We must copy these reloc types into the output file.
1857 Create a reloc section in dynobj and make room for
1858 this reloc. */
1859 if (sreloc == NULL)
1860 {
1861 sreloc = _bfd_elf_make_dynamic_reloc_section
1862 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1863
1864 if (sreloc == NULL)
1865 goto error_return;
1866 }
1867
1868 /* If this is a global symbol, we count the number of
1869 relocations we need for this symbol. */
1870 if (h != NULL)
1871 {
1872 head = &eh->dyn_relocs;
1873 }
1874 else
1875 {
1876 /* Track dynamic relocs needed for local syms too.
1877 We really need local syms available to do this
1878 easily. Oh well. */
1879 void **vpp;
1880 asection *s;
1881
1882 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1883 abfd, r_symndx);
1884 if (isym == NULL)
1885 goto error_return;
1886
1887 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1888 if (s == NULL)
1889 s = sec;
1890
1891 vpp = &elf_section_data (s)->local_dynrel;
1892 head = (struct elf_dyn_relocs **)vpp;
1893 }
1894
1895 p = *head;
1896 if (p == NULL || p->sec != sec)
1897 {
1898 bfd_size_type amt = sizeof *p;
1899 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1900 amt);
1901 if (p == NULL)
1902 goto error_return;
1903 p->next = *head;
1904 *head = p;
1905 p->sec = sec;
1906 p->count = 0;
1907 p->pc_count = 0;
1908 }
1909
1910 p->count += 1;
1911 /* Count size relocation as PC-relative relocation. */
1912 if (r_type == R_386_PC32 || size_reloc)
1913 p->pc_count += 1;
1914 }
1915 break;
1916
1917 /* This relocation describes the C++ object vtable hierarchy.
1918 Reconstruct it for later use during GC. */
1919 case R_386_GNU_VTINHERIT:
1920 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1921 goto error_return;
1922 break;
1923
1924 /* This relocation describes which C++ vtable entries are actually
1925 used. Record for later use during GC. */
1926 case R_386_GNU_VTENTRY:
1927 BFD_ASSERT (h != NULL);
1928 if (h != NULL
1929 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1930 goto error_return;
1931 break;
1932
1933 default:
1934 break;
1935 }
1936 }
1937
1938 if (elf_section_data (sec)->this_hdr.contents != contents)
1939 {
1940 if (!info->keep_memory)
1941 free (contents);
1942 else
1943 {
1944 /* Cache the section contents for elf_link_input_bfd. */
1945 elf_section_data (sec)->this_hdr.contents = contents;
1946 }
1947 }
1948
1949 return TRUE;
1950
1951 error_return:
1952 if (elf_section_data (sec)->this_hdr.contents != contents)
1953 free (contents);
1954 sec->check_relocs_failed = 1;
1955 return FALSE;
1956 }
1957
1958 /* Set the correct type for an x86 ELF section. We do this by the
1959 section name, which is a hack, but ought to work. */
1960
1961 static bfd_boolean
1962 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1963 Elf_Internal_Shdr *hdr,
1964 asection *sec)
1965 {
1966 const char *name;
1967
1968 name = bfd_get_section_name (abfd, sec);
1969
1970 /* This is an ugly, but unfortunately necessary hack that is
1971 needed when producing EFI binaries on x86. It tells
1972 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1973 containing ELF relocation info. We need this hack in order to
1974 be able to generate ELF binaries that can be translated into
1975 EFI applications (which are essentially COFF objects). Those
1976 files contain a COFF ".reloc" section inside an ELFNN object,
1977 which would normally cause BFD to segfault because it would
1978 attempt to interpret this section as containing relocation
1979 entries for section "oc". With this hack enabled, ".reloc"
1980 will be treated as a normal data section, which will avoid the
1981 segfault. However, you won't be able to create an ELFNN binary
1982 with a section named "oc" that needs relocations, but that's
1983 the kind of ugly side-effects you get when detecting section
1984 types based on their names... In practice, this limitation is
1985 unlikely to bite. */
1986 if (strcmp (name, ".reloc") == 0)
1987 hdr->sh_type = SHT_PROGBITS;
1988
1989 return TRUE;
1990 }
1991
1992 /* Return the relocation value for @tpoff relocation
1993 if STT_TLS virtual address is ADDRESS. */
1994
1995 static bfd_vma
1996 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1997 {
1998 struct elf_link_hash_table *htab = elf_hash_table (info);
1999 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2000 bfd_vma static_tls_size;
2001
2002 /* If tls_sec is NULL, we should have signalled an error already. */
2003 if (htab->tls_sec == NULL)
2004 return 0;
2005
2006 /* Consider special static TLS alignment requirements. */
2007 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2008 return static_tls_size + htab->tls_sec->vma - address;
2009 }
2010
2011 /* Relocate an i386 ELF section. */
2012
2013 static bfd_boolean
2014 elf_i386_relocate_section (bfd *output_bfd,
2015 struct bfd_link_info *info,
2016 bfd *input_bfd,
2017 asection *input_section,
2018 bfd_byte *contents,
2019 Elf_Internal_Rela *relocs,
2020 Elf_Internal_Sym *local_syms,
2021 asection **local_sections)
2022 {
2023 struct elf_x86_link_hash_table *htab;
2024 Elf_Internal_Shdr *symtab_hdr;
2025 struct elf_link_hash_entry **sym_hashes;
2026 bfd_vma *local_got_offsets;
2027 bfd_vma *local_tlsdesc_gotents;
2028 Elf_Internal_Rela *rel;
2029 Elf_Internal_Rela *wrel;
2030 Elf_Internal_Rela *relend;
2031 bfd_boolean is_vxworks_tls;
2032 unsigned plt_entry_size;
2033
2034 /* Skip if check_relocs failed. */
2035 if (input_section->check_relocs_failed)
2036 return FALSE;
2037
2038 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2039 if (htab == NULL)
2040 return FALSE;
2041
2042 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2043
2044 symtab_hdr = &elf_symtab_hdr (input_bfd);
2045 sym_hashes = elf_sym_hashes (input_bfd);
2046 local_got_offsets = elf_local_got_offsets (input_bfd);
2047 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2048 /* We have to handle relocations in vxworks .tls_vars sections
2049 specially, because the dynamic loader is 'weird'. */
2050 is_vxworks_tls = (htab->is_vxworks
2051 && bfd_link_pic (info)
2052 && !strcmp (input_section->output_section->name,
2053 ".tls_vars"));
2054
2055 _bfd_x86_elf_set_tls_module_base (info);
2056
2057 plt_entry_size = htab->plt.plt_entry_size;
2058
2059 rel = wrel = relocs;
2060 relend = relocs + input_section->reloc_count;
2061 for (; rel < relend; wrel++, rel++)
2062 {
2063 unsigned int r_type, r_type_tls;
2064 reloc_howto_type *howto;
2065 unsigned long r_symndx;
2066 struct elf_link_hash_entry *h;
2067 struct elf_x86_link_hash_entry *eh;
2068 Elf_Internal_Sym *sym;
2069 asection *sec;
2070 bfd_vma off, offplt, plt_offset;
2071 bfd_vma relocation;
2072 bfd_boolean unresolved_reloc;
2073 bfd_reloc_status_type r;
2074 unsigned int indx;
2075 int tls_type;
2076 bfd_vma st_size;
2077 asection *resolved_plt;
2078 bfd_boolean resolved_to_zero;
2079 bfd_boolean relative_reloc;
2080
2081 r_type = ELF32_R_TYPE (rel->r_info);
2082 if (r_type == R_386_GNU_VTINHERIT
2083 || r_type == R_386_GNU_VTENTRY)
2084 {
2085 if (wrel != rel)
2086 *wrel = *rel;
2087 continue;
2088 }
2089
2090 if ((indx = r_type) >= R_386_standard
2091 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2092 >= R_386_ext - R_386_standard)
2093 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2094 >= R_386_ext2 - R_386_ext))
2095 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2096
2097 howto = elf_howto_table + indx;
2098
2099 r_symndx = ELF32_R_SYM (rel->r_info);
2100 h = NULL;
2101 sym = NULL;
2102 sec = NULL;
2103 unresolved_reloc = FALSE;
2104 if (r_symndx < symtab_hdr->sh_info)
2105 {
2106 sym = local_syms + r_symndx;
2107 sec = local_sections[r_symndx];
2108 relocation = (sec->output_section->vma
2109 + sec->output_offset
2110 + sym->st_value);
2111 st_size = sym->st_size;
2112
2113 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2114 && ((sec->flags & SEC_MERGE) != 0
2115 || (bfd_link_relocatable (info)
2116 && sec->output_offset != 0)))
2117 {
2118 bfd_vma addend;
2119 bfd_byte *where = contents + rel->r_offset;
2120
2121 switch (howto->size)
2122 {
2123 case 0:
2124 addend = bfd_get_8 (input_bfd, where);
2125 if (howto->pc_relative)
2126 {
2127 addend = (addend ^ 0x80) - 0x80;
2128 addend += 1;
2129 }
2130 break;
2131 case 1:
2132 addend = bfd_get_16 (input_bfd, where);
2133 if (howto->pc_relative)
2134 {
2135 addend = (addend ^ 0x8000) - 0x8000;
2136 addend += 2;
2137 }
2138 break;
2139 case 2:
2140 addend = bfd_get_32 (input_bfd, where);
2141 if (howto->pc_relative)
2142 {
2143 addend = (addend ^ 0x80000000) - 0x80000000;
2144 addend += 4;
2145 }
2146 break;
2147 default:
2148 abort ();
2149 }
2150
2151 if (bfd_link_relocatable (info))
2152 addend += sec->output_offset;
2153 else
2154 {
2155 asection *msec = sec;
2156 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2157 addend);
2158 addend -= relocation;
2159 addend += msec->output_section->vma + msec->output_offset;
2160 }
2161
2162 switch (howto->size)
2163 {
2164 case 0:
2165 /* FIXME: overflow checks. */
2166 if (howto->pc_relative)
2167 addend -= 1;
2168 bfd_put_8 (input_bfd, addend, where);
2169 break;
2170 case 1:
2171 if (howto->pc_relative)
2172 addend -= 2;
2173 bfd_put_16 (input_bfd, addend, where);
2174 break;
2175 case 2:
2176 if (howto->pc_relative)
2177 addend -= 4;
2178 bfd_put_32 (input_bfd, addend, where);
2179 break;
2180 }
2181 }
2182 else if (!bfd_link_relocatable (info)
2183 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2184 {
2185 /* Relocate against local STT_GNU_IFUNC symbol. */
2186 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2187 FALSE);
2188 if (h == NULL)
2189 abort ();
2190
2191 /* Set STT_GNU_IFUNC symbol value. */
2192 h->root.u.def.value = sym->st_value;
2193 h->root.u.def.section = sec;
2194 }
2195 }
2196 else
2197 {
2198 bfd_boolean warned ATTRIBUTE_UNUSED;
2199 bfd_boolean ignored ATTRIBUTE_UNUSED;
2200
2201 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2202 r_symndx, symtab_hdr, sym_hashes,
2203 h, sec, relocation,
2204 unresolved_reloc, warned, ignored);
2205 st_size = h->size;
2206 }
2207
2208 if (sec != NULL && discarded_section (sec))
2209 {
2210 _bfd_clear_contents (howto, input_bfd, input_section,
2211 contents + rel->r_offset);
2212 wrel->r_offset = rel->r_offset;
2213 wrel->r_info = 0;
2214 wrel->r_addend = 0;
2215
2216 /* For ld -r, remove relocations in debug sections against
2217 sections defined in discarded sections. Not done for
2218 eh_frame editing code expects to be present. */
2219 if (bfd_link_relocatable (info)
2220 && (input_section->flags & SEC_DEBUGGING))
2221 wrel--;
2222
2223 continue;
2224 }
2225
2226 if (bfd_link_relocatable (info))
2227 {
2228 if (wrel != rel)
2229 *wrel = *rel;
2230 continue;
2231 }
2232
2233 eh = (struct elf_x86_link_hash_entry *) h;
2234
2235 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2236 it here if it is defined in a non-shared object. */
2237 if (h != NULL
2238 && h->type == STT_GNU_IFUNC
2239 && h->def_regular)
2240 {
2241 asection *gotplt, *base_got;
2242 bfd_vma plt_index;
2243 const char *name;
2244
2245 if ((input_section->flags & SEC_ALLOC) == 0)
2246 {
2247 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2248 sections because such sections are not SEC_ALLOC and
2249 thus ld.so will not process them. */
2250 if ((input_section->flags & SEC_DEBUGGING) != 0)
2251 continue;
2252 abort ();
2253 }
2254
2255 /* STT_GNU_IFUNC symbol must go through PLT. */
2256 if (htab->elf.splt != NULL)
2257 {
2258 if (htab->plt_second != NULL)
2259 {
2260 resolved_plt = htab->plt_second;
2261 plt_offset = eh->plt_second.offset;
2262 }
2263 else
2264 {
2265 resolved_plt = htab->elf.splt;
2266 plt_offset = h->plt.offset;
2267 }
2268 gotplt = htab->elf.sgotplt;
2269 }
2270 else
2271 {
2272 resolved_plt = htab->elf.iplt;
2273 plt_offset = h->plt.offset;
2274 gotplt = htab->elf.igotplt;
2275 }
2276
2277 switch (r_type)
2278 {
2279 default:
2280 break;
2281
2282 case R_386_GOT32:
2283 case R_386_GOT32X:
2284 base_got = htab->elf.sgot;
2285 off = h->got.offset;
2286
2287 if (base_got == NULL)
2288 abort ();
2289
2290 if (off == (bfd_vma) -1)
2291 {
2292 /* We can't use h->got.offset here to save state, or
2293 even just remember the offset, as finish_dynamic_symbol
2294 would use that as offset into .got. */
2295
2296 if (h->plt.offset == (bfd_vma) -1)
2297 abort ();
2298
2299 if (htab->elf.splt != NULL)
2300 {
2301 plt_index = (h->plt.offset / plt_entry_size
2302 - htab->plt.has_plt0);
2303 off = (plt_index + 3) * 4;
2304 base_got = htab->elf.sgotplt;
2305 }
2306 else
2307 {
2308 plt_index = h->plt.offset / plt_entry_size;
2309 off = plt_index * 4;
2310 base_got = htab->elf.igotplt;
2311 }
2312
2313 if (h->dynindx == -1
2314 || h->forced_local
2315 || info->symbolic)
2316 {
2317 /* This references the local defitionion. We must
2318 initialize this entry in the global offset table.
2319 Since the offset must always be a multiple of 8,
2320 we use the least significant bit to record
2321 whether we have initialized it already.
2322
2323 When doing a dynamic link, we create a .rela.got
2324 relocation entry to initialize the value. This
2325 is done in the finish_dynamic_symbol routine. */
2326 if ((off & 1) != 0)
2327 off &= ~1;
2328 else
2329 {
2330 bfd_put_32 (output_bfd, relocation,
2331 base_got->contents + off);
2332 h->got.offset |= 1;
2333 }
2334 }
2335
2336 relocation = off;
2337 }
2338 else
2339 relocation = (base_got->output_section->vma
2340 + base_got->output_offset + off
2341 - gotplt->output_section->vma
2342 - gotplt->output_offset);
2343
2344 if (rel->r_offset > 1
2345 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2346 && *(contents + rel->r_offset - 2) != 0x8d)
2347 {
2348 if (bfd_link_pic (info))
2349 goto disallow_got32;
2350
2351 /* Add the GOT base if there is no base register. */
2352 relocation += (gotplt->output_section->vma
2353 + gotplt->output_offset);
2354 }
2355 else if (htab->elf.splt == NULL)
2356 {
2357 /* Adjust for static executables. */
2358 relocation += gotplt->output_offset;
2359 }
2360
2361 goto do_relocation;
2362 }
2363
2364 if (h->plt.offset == (bfd_vma) -1)
2365 {
2366 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2367 if (r_type == R_386_32
2368 && (input_section->flags & SEC_CODE) == 0)
2369 goto do_ifunc_pointer;
2370 goto bad_ifunc_reloc;
2371 }
2372
2373 relocation = (resolved_plt->output_section->vma
2374 + resolved_plt->output_offset + plt_offset);
2375
2376 switch (r_type)
2377 {
2378 default:
2379 bad_ifunc_reloc:
2380 if (h->root.root.string)
2381 name = h->root.root.string;
2382 else
2383 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2384 NULL);
2385 _bfd_error_handler
2386 /* xgettext:c-format */
2387 (_("%B: relocation %s against STT_GNU_IFUNC "
2388 "symbol `%s' isn't supported"), input_bfd,
2389 howto->name, name);
2390 bfd_set_error (bfd_error_bad_value);
2391 return FALSE;
2392
2393 case R_386_32:
2394 /* Generate dynamic relcoation only when there is a
2395 non-GOT reference in a shared object. */
2396 if ((bfd_link_pic (info) && h->non_got_ref)
2397 || h->plt.offset == (bfd_vma) -1)
2398 {
2399 Elf_Internal_Rela outrel;
2400 asection *sreloc;
2401 bfd_vma offset;
2402
2403 do_ifunc_pointer:
2404 /* Need a dynamic relocation to get the real function
2405 adddress. */
2406 offset = _bfd_elf_section_offset (output_bfd,
2407 info,
2408 input_section,
2409 rel->r_offset);
2410 if (offset == (bfd_vma) -1
2411 || offset == (bfd_vma) -2)
2412 abort ();
2413
2414 outrel.r_offset = (input_section->output_section->vma
2415 + input_section->output_offset
2416 + offset);
2417
2418 if (h->dynindx == -1
2419 || h->forced_local
2420 || bfd_link_executable (info))
2421 {
2422 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2423 h->root.root.string,
2424 h->root.u.def.section->owner);
2425
2426 /* This symbol is resolved locally. */
2427 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2428 bfd_put_32 (output_bfd,
2429 (h->root.u.def.value
2430 + h->root.u.def.section->output_section->vma
2431 + h->root.u.def.section->output_offset),
2432 contents + offset);
2433 }
2434 else
2435 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2436
2437 /* Dynamic relocations are stored in
2438 1. .rel.ifunc section in PIC object.
2439 2. .rel.got section in dynamic executable.
2440 3. .rel.iplt section in static executable. */
2441 if (bfd_link_pic (info))
2442 sreloc = htab->elf.irelifunc;
2443 else if (htab->elf.splt != NULL)
2444 sreloc = htab->elf.srelgot;
2445 else
2446 sreloc = htab->elf.irelplt;
2447 elf_append_rel (output_bfd, sreloc, &outrel);
2448
2449 /* If this reloc is against an external symbol, we
2450 do not want to fiddle with the addend. Otherwise,
2451 we need to include the symbol value so that it
2452 becomes an addend for the dynamic reloc. For an
2453 internal symbol, we have updated addend. */
2454 continue;
2455 }
2456 /* FALLTHROUGH */
2457 case R_386_PC32:
2458 case R_386_PLT32:
2459 goto do_relocation;
2460
2461 case R_386_GOTOFF:
2462 relocation -= (gotplt->output_section->vma
2463 + gotplt->output_offset);
2464 goto do_relocation;
2465 }
2466 }
2467
2468 resolved_to_zero = (eh != NULL
2469 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2470 I386_ELF_DATA,
2471 eh->has_got_reloc,
2472 eh));
2473
2474 switch (r_type)
2475 {
2476 case R_386_GOT32X:
2477 /* Avoid optimizing _DYNAMIC since ld.so may use its
2478 link-time address. */
2479 if (h == htab->elf.hdynamic)
2480 goto r_386_got32;
2481
2482 if (bfd_link_pic (info))
2483 {
2484 /* It is OK to convert mov to lea and convert indirect
2485 branch to direct branch. It is OK to convert adc,
2486 add, and, cmp, or, sbb, sub, test, xor only when PIC
2487 is false. */
2488 unsigned int opcode, addend;
2489 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2490 if (addend != 0)
2491 goto r_386_got32;
2492 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2493 if (opcode != 0x8b && opcode != 0xff)
2494 goto r_386_got32;
2495 }
2496
2497 /* Resolve "mov GOT[(%reg)], %reg",
2498 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2499 and "binop foo@GOT[(%reg)], %reg". */
2500 if (h == NULL
2501 || (h->plt.offset == (bfd_vma) -1
2502 && h->got.offset == (bfd_vma) -1)
2503 || htab->elf.sgotplt == NULL)
2504 abort ();
2505
2506 offplt = (htab->elf.sgotplt->output_section->vma
2507 + htab->elf.sgotplt->output_offset);
2508
2509 /* It is relative to .got.plt section. */
2510 if (h->got.offset != (bfd_vma) -1)
2511 /* Use GOT entry. Mask off the least significant bit in
2512 GOT offset which may be set by R_386_GOT32 processing
2513 below. */
2514 relocation = (htab->elf.sgot->output_section->vma
2515 + htab->elf.sgot->output_offset
2516 + (h->got.offset & ~1) - offplt);
2517 else
2518 /* Use GOTPLT entry. */
2519 relocation = (h->plt.offset / plt_entry_size
2520 - htab->plt.has_plt0 + 3) * 4;
2521
2522 if (!bfd_link_pic (info))
2523 {
2524 /* If not PIC, add the .got.plt section address for
2525 baseless addressing. */
2526 unsigned int modrm;
2527 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2528 if ((modrm & 0xc7) == 0x5)
2529 relocation += offplt;
2530 }
2531
2532 unresolved_reloc = FALSE;
2533 break;
2534
2535 case R_386_GOT32:
2536 r_386_got32:
2537 /* Relocation is to the entry for this symbol in the global
2538 offset table. */
2539 if (htab->elf.sgot == NULL)
2540 abort ();
2541
2542 relative_reloc = FALSE;
2543 if (h != NULL)
2544 {
2545 bfd_boolean dyn;
2546
2547 off = h->got.offset;
2548 dyn = htab->elf.dynamic_sections_created;
2549 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2550 bfd_link_pic (info),
2551 h)
2552 || (bfd_link_pic (info)
2553 && SYMBOL_REFERENCES_LOCAL_P (info, h))
2554 || (ELF_ST_VISIBILITY (h->other)
2555 && h->root.type == bfd_link_hash_undefweak))
2556 {
2557 /* This is actually a static link, or it is a
2558 -Bsymbolic link and the symbol is defined
2559 locally, or the symbol was forced to be local
2560 because of a version file. We must initialize
2561 this entry in the global offset table. Since the
2562 offset must always be a multiple of 4, we use the
2563 least significant bit to record whether we have
2564 initialized it already.
2565
2566 When doing a dynamic link, we create a .rel.got
2567 relocation entry to initialize the value. This
2568 is done in the finish_dynamic_symbol routine. */
2569 if ((off & 1) != 0)
2570 off &= ~1;
2571 else
2572 {
2573 bfd_put_32 (output_bfd, relocation,
2574 htab->elf.sgot->contents + off);
2575 h->got.offset |= 1;
2576
2577 if (h->dynindx == -1
2578 && !h->forced_local
2579 && h->root.type != bfd_link_hash_undefweak
2580 && bfd_link_pic (info))
2581 {
2582 /* PR ld/21402: If this symbol isn't dynamic
2583 in PIC, generate R_386_RELATIVE here. */
2584 eh->no_finish_dynamic_symbol = 1;
2585 relative_reloc = TRUE;
2586 }
2587 }
2588 }
2589 else
2590 unresolved_reloc = FALSE;
2591 }
2592 else
2593 {
2594 if (local_got_offsets == NULL)
2595 abort ();
2596
2597 off = local_got_offsets[r_symndx];
2598
2599 /* The offset must always be a multiple of 4. We use
2600 the least significant bit to record whether we have
2601 already generated the necessary reloc. */
2602 if ((off & 1) != 0)
2603 off &= ~1;
2604 else
2605 {
2606 bfd_put_32 (output_bfd, relocation,
2607 htab->elf.sgot->contents + off);
2608 local_got_offsets[r_symndx] |= 1;
2609
2610 if (bfd_link_pic (info))
2611 relative_reloc = TRUE;
2612 }
2613 }
2614
2615 if (relative_reloc)
2616 {
2617 asection *s;
2618 Elf_Internal_Rela outrel;
2619
2620 s = htab->elf.srelgot;
2621 if (s == NULL)
2622 abort ();
2623
2624 outrel.r_offset = (htab->elf.sgot->output_section->vma
2625 + htab->elf.sgot->output_offset
2626 + off);
2627 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2628 elf_append_rel (output_bfd, s, &outrel);
2629 }
2630
2631 if (off >= (bfd_vma) -2)
2632 abort ();
2633
2634 relocation = (htab->elf.sgot->output_section->vma
2635 + htab->elf.sgot->output_offset + off);
2636 if (rel->r_offset > 1
2637 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2638 && *(contents + rel->r_offset - 2) != 0x8d)
2639 {
2640 if (bfd_link_pic (info))
2641 {
2642 /* For PIC, disallow R_386_GOT32 without a base
2643 register, except for "lea foo@GOT, %reg", since
2644 we don't know what the GOT base is. */
2645 const char *name;
2646
2647 disallow_got32:
2648 if (h == NULL || h->root.root.string == NULL)
2649 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2650 NULL);
2651 else
2652 name = h->root.root.string;
2653
2654 _bfd_error_handler
2655 /* xgettext:c-format */
2656 (_("%B: direct GOT relocation %s against `%s'"
2657 " without base register can not be used"
2658 " when making a shared object"),
2659 input_bfd, howto->name, name);
2660 bfd_set_error (bfd_error_bad_value);
2661 return FALSE;
2662 }
2663 }
2664 else
2665 {
2666 /* Subtract the .got.plt section address only with a base
2667 register. */
2668 relocation -= (htab->elf.sgotplt->output_section->vma
2669 + htab->elf.sgotplt->output_offset);
2670 }
2671
2672 break;
2673
2674 case R_386_GOTOFF:
2675 /* Relocation is relative to the start of the global offset
2676 table. */
2677
2678 /* Check to make sure it isn't a protected function or data
2679 symbol for shared library since it may not be local when
2680 used as function address or with copy relocation. We also
2681 need to make sure that a symbol is referenced locally. */
2682 if (!bfd_link_executable (info) && h)
2683 {
2684 if (!h->def_regular)
2685 {
2686 const char *v;
2687
2688 switch (ELF_ST_VISIBILITY (h->other))
2689 {
2690 case STV_HIDDEN:
2691 v = _("hidden symbol");
2692 break;
2693 case STV_INTERNAL:
2694 v = _("internal symbol");
2695 break;
2696 case STV_PROTECTED:
2697 v = _("protected symbol");
2698 break;
2699 default:
2700 v = _("symbol");
2701 break;
2702 }
2703
2704 _bfd_error_handler
2705 /* xgettext:c-format */
2706 (_("%B: relocation R_386_GOTOFF against undefined %s"
2707 " `%s' can not be used when making a shared object"),
2708 input_bfd, v, h->root.root.string);
2709 bfd_set_error (bfd_error_bad_value);
2710 return FALSE;
2711 }
2712 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2713 && (h->type == STT_FUNC
2714 || h->type == STT_OBJECT)
2715 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2716 {
2717 _bfd_error_handler
2718 /* xgettext:c-format */
2719 (_("%B: relocation R_386_GOTOFF against protected %s"
2720 " `%s' can not be used when making a shared object"),
2721 input_bfd,
2722 h->type == STT_FUNC ? "function" : "data",
2723 h->root.root.string);
2724 bfd_set_error (bfd_error_bad_value);
2725 return FALSE;
2726 }
2727 }
2728
2729 /* Note that sgot is not involved in this
2730 calculation. We always want the start of .got.plt. If we
2731 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2732 permitted by the ABI, we might have to change this
2733 calculation. */
2734 relocation -= htab->elf.sgotplt->output_section->vma
2735 + htab->elf.sgotplt->output_offset;
2736 break;
2737
2738 case R_386_GOTPC:
2739 /* Use global offset table as symbol value. */
2740 relocation = htab->elf.sgotplt->output_section->vma
2741 + htab->elf.sgotplt->output_offset;
2742 unresolved_reloc = FALSE;
2743 break;
2744
2745 case R_386_PLT32:
2746 /* Relocation is to the entry for this symbol in the
2747 procedure linkage table. */
2748
2749 /* Resolve a PLT32 reloc against a local symbol directly,
2750 without using the procedure linkage table. */
2751 if (h == NULL)
2752 break;
2753
2754 if ((h->plt.offset == (bfd_vma) -1
2755 && eh->plt_got.offset == (bfd_vma) -1)
2756 || htab->elf.splt == NULL)
2757 {
2758 /* We didn't make a PLT entry for this symbol. This
2759 happens when statically linking PIC code, or when
2760 using -Bsymbolic. */
2761 break;
2762 }
2763
2764 if (h->plt.offset != (bfd_vma) -1)
2765 {
2766 if (htab->plt_second != NULL)
2767 {
2768 resolved_plt = htab->plt_second;
2769 plt_offset = eh->plt_second.offset;
2770 }
2771 else
2772 {
2773 resolved_plt = htab->elf.splt;
2774 plt_offset = h->plt.offset;
2775 }
2776 }
2777 else
2778 {
2779 resolved_plt = htab->plt_got;
2780 plt_offset = eh->plt_got.offset;
2781 }
2782
2783 relocation = (resolved_plt->output_section->vma
2784 + resolved_plt->output_offset
2785 + plt_offset);
2786 unresolved_reloc = FALSE;
2787 break;
2788
2789 case R_386_SIZE32:
2790 /* Set to symbol size. */
2791 relocation = st_size;
2792 /* Fall through. */
2793
2794 case R_386_32:
2795 case R_386_PC32:
2796 if ((input_section->flags & SEC_ALLOC) == 0
2797 || is_vxworks_tls)
2798 break;
2799
2800 /* Copy dynamic function pointer relocations. Don't generate
2801 dynamic relocations against resolved undefined weak symbols
2802 in PIE, except for R_386_PC32. */
2803 if ((bfd_link_pic (info)
2804 && (h == NULL
2805 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2806 && (!resolved_to_zero
2807 || r_type == R_386_PC32))
2808 || h->root.type != bfd_link_hash_undefweak))
2809 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
2810 || !SYMBOL_CALLS_LOCAL (info, h)))
2811 || (ELIMINATE_COPY_RELOCS
2812 && !bfd_link_pic (info)
2813 && h != NULL
2814 && h->dynindx != -1
2815 && (!h->non_got_ref
2816 || eh->func_pointer_refcount > 0
2817 || (h->root.type == bfd_link_hash_undefweak
2818 && !resolved_to_zero))
2819 && ((h->def_dynamic && !h->def_regular)
2820 /* Undefined weak symbol is bound locally when
2821 PIC is false. */
2822 || h->root.type == bfd_link_hash_undefweak)))
2823 {
2824 Elf_Internal_Rela outrel;
2825 bfd_boolean skip, relocate;
2826 asection *sreloc;
2827
2828 /* When generating a shared object, these relocations
2829 are copied into the output file to be resolved at run
2830 time. */
2831
2832 skip = FALSE;
2833 relocate = FALSE;
2834
2835 outrel.r_offset =
2836 _bfd_elf_section_offset (output_bfd, info, input_section,
2837 rel->r_offset);
2838 if (outrel.r_offset == (bfd_vma) -1)
2839 skip = TRUE;
2840 else if (outrel.r_offset == (bfd_vma) -2)
2841 skip = TRUE, relocate = TRUE;
2842 outrel.r_offset += (input_section->output_section->vma
2843 + input_section->output_offset);
2844
2845 if (skip)
2846 memset (&outrel, 0, sizeof outrel);
2847 else if (h != NULL
2848 && h->dynindx != -1
2849 && (r_type == R_386_PC32
2850 || !(bfd_link_executable (info)
2851 || SYMBOLIC_BIND (info, h))
2852 || !h->def_regular))
2853 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2854 else
2855 {
2856 /* This symbol is local, or marked to become local. */
2857 relocate = TRUE;
2858 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2859 }
2860
2861 sreloc = elf_section_data (input_section)->sreloc;
2862
2863 if (sreloc == NULL || sreloc->contents == NULL)
2864 {
2865 r = bfd_reloc_notsupported;
2866 goto check_relocation_error;
2867 }
2868
2869 elf_append_rel (output_bfd, sreloc, &outrel);
2870
2871 /* If this reloc is against an external symbol, we do
2872 not want to fiddle with the addend. Otherwise, we
2873 need to include the symbol value so that it becomes
2874 an addend for the dynamic reloc. */
2875 if (! relocate)
2876 continue;
2877 }
2878 break;
2879
2880 case R_386_TLS_IE:
2881 if (!bfd_link_executable (info))
2882 {
2883 Elf_Internal_Rela outrel;
2884 asection *sreloc;
2885
2886 outrel.r_offset = rel->r_offset
2887 + input_section->output_section->vma
2888 + input_section->output_offset;
2889 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2890 sreloc = elf_section_data (input_section)->sreloc;
2891 if (sreloc == NULL)
2892 abort ();
2893 elf_append_rel (output_bfd, sreloc, &outrel);
2894 }
2895 /* Fall through */
2896
2897 case R_386_TLS_GD:
2898 case R_386_TLS_GOTDESC:
2899 case R_386_TLS_DESC_CALL:
2900 case R_386_TLS_IE_32:
2901 case R_386_TLS_GOTIE:
2902 tls_type = GOT_UNKNOWN;
2903 if (h == NULL && local_got_offsets)
2904 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2905 else if (h != NULL)
2906 tls_type = elf_x86_hash_entry(h)->tls_type;
2907 if (tls_type == GOT_TLS_IE)
2908 tls_type = GOT_TLS_IE_NEG;
2909
2910 r_type_tls = r_type;
2911 if (! elf_i386_tls_transition (info, input_bfd,
2912 input_section, contents,
2913 symtab_hdr, sym_hashes,
2914 &r_type_tls, tls_type, rel,
2915 relend, h, r_symndx, TRUE))
2916 return FALSE;
2917
2918 if (r_type_tls == R_386_TLS_LE_32)
2919 {
2920 BFD_ASSERT (! unresolved_reloc);
2921 if (r_type == R_386_TLS_GD)
2922 {
2923 unsigned int type;
2924 bfd_vma roff;
2925
2926 /* GD->LE transition. */
2927 type = *(contents + rel->r_offset - 2);
2928 if (type == 0x04)
2929 {
2930 /* Change
2931 leal foo@tlsgd(,%ebx,1), %eax
2932 call ___tls_get_addr@PLT
2933 into:
2934 movl %gs:0, %eax
2935 subl $foo@tpoff, %eax
2936 (6 byte form of subl). */
2937 roff = rel->r_offset + 5;
2938 }
2939 else
2940 {
2941 /* Change
2942 leal foo@tlsgd(%ebx), %eax
2943 call ___tls_get_addr@PLT
2944 nop
2945 or
2946 leal foo@tlsgd(%reg), %eax
2947 call *___tls_get_addr@GOT(%reg)
2948 which may be converted to
2949 addr32 call ___tls_get_addr
2950 into:
2951 movl %gs:0, %eax; subl $foo@tpoff, %eax
2952 (6 byte form of subl). */
2953 roff = rel->r_offset + 6;
2954 }
2955 memcpy (contents + roff - 8,
2956 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2957 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2958 contents + roff);
2959 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2960 rel++;
2961 wrel++;
2962 continue;
2963 }
2964 else if (r_type == R_386_TLS_GOTDESC)
2965 {
2966 /* GDesc -> LE transition.
2967 It's originally something like:
2968 leal x@tlsdesc(%ebx), %eax
2969
2970 leal x@ntpoff, %eax
2971
2972 Registers other than %eax may be set up here. */
2973
2974 unsigned int val;
2975 bfd_vma roff;
2976
2977 roff = rel->r_offset;
2978 val = bfd_get_8 (input_bfd, contents + roff - 1);
2979
2980 /* Now modify the instruction as appropriate. */
2981 /* aoliva FIXME: remove the above and xor the byte
2982 below with 0x86. */
2983 bfd_put_8 (output_bfd, val ^ 0x86,
2984 contents + roff - 1);
2985 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2986 contents + roff);
2987 continue;
2988 }
2989 else if (r_type == R_386_TLS_DESC_CALL)
2990 {
2991 /* GDesc -> LE transition.
2992 It's originally:
2993 call *(%eax)
2994 Turn it into:
2995 xchg %ax,%ax */
2996
2997 bfd_vma roff;
2998
2999 roff = rel->r_offset;
3000 bfd_put_8 (output_bfd, 0x66, contents + roff);
3001 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3002 continue;
3003 }
3004 else if (r_type == R_386_TLS_IE)
3005 {
3006 unsigned int val;
3007
3008 /* IE->LE transition:
3009 Originally it can be one of:
3010 movl foo, %eax
3011 movl foo, %reg
3012 addl foo, %reg
3013 We change it into:
3014 movl $foo, %eax
3015 movl $foo, %reg
3016 addl $foo, %reg. */
3017 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3018 if (val == 0xa1)
3019 {
3020 /* movl foo, %eax. */
3021 bfd_put_8 (output_bfd, 0xb8,
3022 contents + rel->r_offset - 1);
3023 }
3024 else
3025 {
3026 unsigned int type;
3027
3028 type = bfd_get_8 (input_bfd,
3029 contents + rel->r_offset - 2);
3030 switch (type)
3031 {
3032 case 0x8b:
3033 /* movl */
3034 bfd_put_8 (output_bfd, 0xc7,
3035 contents + rel->r_offset - 2);
3036 bfd_put_8 (output_bfd,
3037 0xc0 | ((val >> 3) & 7),
3038 contents + rel->r_offset - 1);
3039 break;
3040 case 0x03:
3041 /* addl */
3042 bfd_put_8 (output_bfd, 0x81,
3043 contents + rel->r_offset - 2);
3044 bfd_put_8 (output_bfd,
3045 0xc0 | ((val >> 3) & 7),
3046 contents + rel->r_offset - 1);
3047 break;
3048 default:
3049 BFD_FAIL ();
3050 break;
3051 }
3052 }
3053 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3054 contents + rel->r_offset);
3055 continue;
3056 }
3057 else
3058 {
3059 unsigned int val, type;
3060
3061 /* {IE_32,GOTIE}->LE transition:
3062 Originally it can be one of:
3063 subl foo(%reg1), %reg2
3064 movl foo(%reg1), %reg2
3065 addl foo(%reg1), %reg2
3066 We change it into:
3067 subl $foo, %reg2
3068 movl $foo, %reg2 (6 byte form)
3069 addl $foo, %reg2. */
3070 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3071 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3072 if (type == 0x8b)
3073 {
3074 /* movl */
3075 bfd_put_8 (output_bfd, 0xc7,
3076 contents + rel->r_offset - 2);
3077 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3078 contents + rel->r_offset - 1);
3079 }
3080 else if (type == 0x2b)
3081 {
3082 /* subl */
3083 bfd_put_8 (output_bfd, 0x81,
3084 contents + rel->r_offset - 2);
3085 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3086 contents + rel->r_offset - 1);
3087 }
3088 else if (type == 0x03)
3089 {
3090 /* addl */
3091 bfd_put_8 (output_bfd, 0x81,
3092 contents + rel->r_offset - 2);
3093 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3094 contents + rel->r_offset - 1);
3095 }
3096 else
3097 BFD_FAIL ();
3098 if (r_type == R_386_TLS_GOTIE)
3099 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3100 contents + rel->r_offset);
3101 else
3102 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3103 contents + rel->r_offset);
3104 continue;
3105 }
3106 }
3107
3108 if (htab->elf.sgot == NULL)
3109 abort ();
3110
3111 if (h != NULL)
3112 {
3113 off = h->got.offset;
3114 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3115 }
3116 else
3117 {
3118 if (local_got_offsets == NULL)
3119 abort ();
3120
3121 off = local_got_offsets[r_symndx];
3122 offplt = local_tlsdesc_gotents[r_symndx];
3123 }
3124
3125 if ((off & 1) != 0)
3126 off &= ~1;
3127 else
3128 {
3129 Elf_Internal_Rela outrel;
3130 int dr_type;
3131 asection *sreloc;
3132
3133 if (htab->elf.srelgot == NULL)
3134 abort ();
3135
3136 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3137
3138 if (GOT_TLS_GDESC_P (tls_type))
3139 {
3140 bfd_byte *loc;
3141 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3142 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3143 <= htab->elf.sgotplt->size);
3144 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3145 + htab->elf.sgotplt->output_offset
3146 + offplt
3147 + htab->sgotplt_jump_table_size);
3148 sreloc = htab->elf.srelplt;
3149 loc = sreloc->contents;
3150 loc += (htab->next_tls_desc_index++
3151 * sizeof (Elf32_External_Rel));
3152 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3153 <= sreloc->contents + sreloc->size);
3154 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3155 if (indx == 0)
3156 {
3157 BFD_ASSERT (! unresolved_reloc);
3158 bfd_put_32 (output_bfd,
3159 relocation - _bfd_x86_elf_dtpoff_base (info),
3160 htab->elf.sgotplt->contents + offplt
3161 + htab->sgotplt_jump_table_size + 4);
3162 }
3163 else
3164 {
3165 bfd_put_32 (output_bfd, 0,
3166 htab->elf.sgotplt->contents + offplt
3167 + htab->sgotplt_jump_table_size + 4);
3168 }
3169 }
3170
3171 sreloc = htab->elf.srelgot;
3172
3173 outrel.r_offset = (htab->elf.sgot->output_section->vma
3174 + htab->elf.sgot->output_offset + off);
3175
3176 if (GOT_TLS_GD_P (tls_type))
3177 dr_type = R_386_TLS_DTPMOD32;
3178 else if (GOT_TLS_GDESC_P (tls_type))
3179 goto dr_done;
3180 else if (tls_type == GOT_TLS_IE_POS)
3181 dr_type = R_386_TLS_TPOFF;
3182 else
3183 dr_type = R_386_TLS_TPOFF32;
3184
3185 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3186 bfd_put_32 (output_bfd,
3187 relocation - _bfd_x86_elf_dtpoff_base (info),
3188 htab->elf.sgot->contents + off);
3189 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3190 bfd_put_32 (output_bfd,
3191 _bfd_x86_elf_dtpoff_base (info) - relocation,
3192 htab->elf.sgot->contents + off);
3193 else if (dr_type != R_386_TLS_DESC)
3194 bfd_put_32 (output_bfd, 0,
3195 htab->elf.sgot->contents + off);
3196 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3197
3198 elf_append_rel (output_bfd, sreloc, &outrel);
3199
3200 if (GOT_TLS_GD_P (tls_type))
3201 {
3202 if (indx == 0)
3203 {
3204 BFD_ASSERT (! unresolved_reloc);
3205 bfd_put_32 (output_bfd,
3206 relocation - _bfd_x86_elf_dtpoff_base (info),
3207 htab->elf.sgot->contents + off + 4);
3208 }
3209 else
3210 {
3211 bfd_put_32 (output_bfd, 0,
3212 htab->elf.sgot->contents + off + 4);
3213 outrel.r_info = ELF32_R_INFO (indx,
3214 R_386_TLS_DTPOFF32);
3215 outrel.r_offset += 4;
3216 elf_append_rel (output_bfd, sreloc, &outrel);
3217 }
3218 }
3219 else if (tls_type == GOT_TLS_IE_BOTH)
3220 {
3221 bfd_put_32 (output_bfd,
3222 (indx == 0
3223 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3224 : 0),
3225 htab->elf.sgot->contents + off + 4);
3226 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3227 outrel.r_offset += 4;
3228 elf_append_rel (output_bfd, sreloc, &outrel);
3229 }
3230
3231 dr_done:
3232 if (h != NULL)
3233 h->got.offset |= 1;
3234 else
3235 local_got_offsets[r_symndx] |= 1;
3236 }
3237
3238 if (off >= (bfd_vma) -2
3239 && ! GOT_TLS_GDESC_P (tls_type))
3240 abort ();
3241 if (r_type_tls == R_386_TLS_GOTDESC
3242 || r_type_tls == R_386_TLS_DESC_CALL)
3243 {
3244 relocation = htab->sgotplt_jump_table_size + offplt;
3245 unresolved_reloc = FALSE;
3246 }
3247 else if (r_type_tls == r_type)
3248 {
3249 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3250 + htab->elf.sgotplt->output_offset;
3251 relocation = htab->elf.sgot->output_section->vma
3252 + htab->elf.sgot->output_offset + off - g_o_t;
3253 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3254 && tls_type == GOT_TLS_IE_BOTH)
3255 relocation += 4;
3256 if (r_type == R_386_TLS_IE)
3257 relocation += g_o_t;
3258 unresolved_reloc = FALSE;
3259 }
3260 else if (r_type == R_386_TLS_GD)
3261 {
3262 unsigned int val, type;
3263 bfd_vma roff;
3264
3265 /* GD->IE transition. */
3266 type = *(contents + rel->r_offset - 2);
3267 val = *(contents + rel->r_offset - 1);
3268 if (type == 0x04)
3269 {
3270 /* Change
3271 leal foo@tlsgd(,%ebx,1), %eax
3272 call ___tls_get_addr@PLT
3273 into:
3274 movl %gs:0, %eax
3275 subl $foo@gottpoff(%ebx), %eax. */
3276 val >>= 3;
3277 roff = rel->r_offset - 3;
3278 }
3279 else
3280 {
3281 /* Change
3282 leal foo@tlsgd(%ebx), %eax
3283 call ___tls_get_addr@PLT
3284 nop
3285 or
3286 leal foo@tlsgd(%reg), %eax
3287 call *___tls_get_addr@GOT(%reg)
3288 which may be converted to
3289 addr32 call ___tls_get_addr
3290 into:
3291 movl %gs:0, %eax;
3292 subl $foo@gottpoff(%reg), %eax. */
3293 roff = rel->r_offset - 2;
3294 }
3295 memcpy (contents + roff,
3296 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3297 contents[roff + 7] = 0x80 | (val & 7);
3298 /* If foo is used only with foo@gotntpoff(%reg) and
3299 foo@indntpoff, but not with foo@gottpoff(%reg), change
3300 subl $foo@gottpoff(%reg), %eax
3301 into:
3302 addl $foo@gotntpoff(%reg), %eax. */
3303 if (tls_type == GOT_TLS_IE_POS)
3304 contents[roff + 6] = 0x03;
3305 bfd_put_32 (output_bfd,
3306 htab->elf.sgot->output_section->vma
3307 + htab->elf.sgot->output_offset + off
3308 - htab->elf.sgotplt->output_section->vma
3309 - htab->elf.sgotplt->output_offset,
3310 contents + roff + 8);
3311 /* Skip R_386_PLT32 and R_386_GOT32X. */
3312 rel++;
3313 wrel++;
3314 continue;
3315 }
3316 else if (r_type == R_386_TLS_GOTDESC)
3317 {
3318 /* GDesc -> IE transition.
3319 It's originally something like:
3320 leal x@tlsdesc(%ebx), %eax
3321
3322 Change it to:
3323 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3324 or:
3325 movl x@gottpoff(%ebx), %eax # before negl %eax
3326
3327 Registers other than %eax may be set up here. */
3328
3329 bfd_vma roff;
3330
3331 /* First, make sure it's a leal adding ebx to a 32-bit
3332 offset into any register, although it's probably
3333 almost always going to be eax. */
3334 roff = rel->r_offset;
3335
3336 /* Now modify the instruction as appropriate. */
3337 /* To turn a leal into a movl in the form we use it, it
3338 suffices to change the first byte from 0x8d to 0x8b.
3339 aoliva FIXME: should we decide to keep the leal, all
3340 we have to do is remove the statement below, and
3341 adjust the relaxation of R_386_TLS_DESC_CALL. */
3342 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3343
3344 if (tls_type == GOT_TLS_IE_BOTH)
3345 off += 4;
3346
3347 bfd_put_32 (output_bfd,
3348 htab->elf.sgot->output_section->vma
3349 + htab->elf.sgot->output_offset + off
3350 - htab->elf.sgotplt->output_section->vma
3351 - htab->elf.sgotplt->output_offset,
3352 contents + roff);
3353 continue;
3354 }
3355 else if (r_type == R_386_TLS_DESC_CALL)
3356 {
3357 /* GDesc -> IE transition.
3358 It's originally:
3359 call *(%eax)
3360
3361 Change it to:
3362 xchg %ax,%ax
3363 or
3364 negl %eax
3365 depending on how we transformed the TLS_GOTDESC above.
3366 */
3367
3368 bfd_vma roff;
3369
3370 roff = rel->r_offset;
3371
3372 /* Now modify the instruction as appropriate. */
3373 if (tls_type != GOT_TLS_IE_NEG)
3374 {
3375 /* xchg %ax,%ax */
3376 bfd_put_8 (output_bfd, 0x66, contents + roff);
3377 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3378 }
3379 else
3380 {
3381 /* negl %eax */
3382 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3383 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3384 }
3385
3386 continue;
3387 }
3388 else
3389 BFD_ASSERT (FALSE);
3390 break;
3391
3392 case R_386_TLS_LDM:
3393 if (! elf_i386_tls_transition (info, input_bfd,
3394 input_section, contents,
3395 symtab_hdr, sym_hashes,
3396 &r_type, GOT_UNKNOWN, rel,
3397 relend, h, r_symndx, TRUE))
3398 return FALSE;
3399
3400 if (r_type != R_386_TLS_LDM)
3401 {
3402 /* LD->LE transition. Change
3403 leal foo@tlsldm(%ebx) %eax
3404 call ___tls_get_addr@PLT
3405 into:
3406 movl %gs:0, %eax
3407 nop
3408 leal 0(%esi,1), %esi
3409 or change
3410 leal foo@tlsldm(%reg) %eax
3411 call *___tls_get_addr@GOT(%reg)
3412 which may be converted to
3413 addr32 call ___tls_get_addr
3414 into:
3415 movl %gs:0, %eax
3416 leal 0(%esi), %esi */
3417 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3418 if (*(contents + rel->r_offset + 4) == 0xff
3419 || *(contents + rel->r_offset + 4) == 0x67)
3420 memcpy (contents + rel->r_offset - 2,
3421 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3422 else
3423 memcpy (contents + rel->r_offset - 2,
3424 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3425 /* Skip R_386_PC32/R_386_PLT32. */
3426 rel++;
3427 wrel++;
3428 continue;
3429 }
3430
3431 if (htab->elf.sgot == NULL)
3432 abort ();
3433
3434 off = htab->tls_ld_or_ldm_got.offset;
3435 if (off & 1)
3436 off &= ~1;
3437 else
3438 {
3439 Elf_Internal_Rela outrel;
3440
3441 if (htab->elf.srelgot == NULL)
3442 abort ();
3443
3444 outrel.r_offset = (htab->elf.sgot->output_section->vma
3445 + htab->elf.sgot->output_offset + off);
3446
3447 bfd_put_32 (output_bfd, 0,
3448 htab->elf.sgot->contents + off);
3449 bfd_put_32 (output_bfd, 0,
3450 htab->elf.sgot->contents + off + 4);
3451 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3452 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3453 htab->tls_ld_or_ldm_got.offset |= 1;
3454 }
3455 relocation = htab->elf.sgot->output_section->vma
3456 + htab->elf.sgot->output_offset + off
3457 - htab->elf.sgotplt->output_section->vma
3458 - htab->elf.sgotplt->output_offset;
3459 unresolved_reloc = FALSE;
3460 break;
3461
3462 case R_386_TLS_LDO_32:
3463 if (!bfd_link_executable (info)
3464 || (input_section->flags & SEC_CODE) == 0)
3465 relocation -= _bfd_x86_elf_dtpoff_base (info);
3466 else
3467 /* When converting LDO to LE, we must negate. */
3468 relocation = -elf_i386_tpoff (info, relocation);
3469 break;
3470
3471 case R_386_TLS_LE_32:
3472 case R_386_TLS_LE:
3473 if (!bfd_link_executable (info))
3474 {
3475 Elf_Internal_Rela outrel;
3476 asection *sreloc;
3477
3478 outrel.r_offset = rel->r_offset
3479 + input_section->output_section->vma
3480 + input_section->output_offset;
3481 if (h != NULL && h->dynindx != -1)
3482 indx = h->dynindx;
3483 else
3484 indx = 0;
3485 if (r_type == R_386_TLS_LE_32)
3486 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3487 else
3488 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3489 sreloc = elf_section_data (input_section)->sreloc;
3490 if (sreloc == NULL)
3491 abort ();
3492 elf_append_rel (output_bfd, sreloc, &outrel);
3493 if (indx)
3494 continue;
3495 else if (r_type == R_386_TLS_LE_32)
3496 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3497 else
3498 relocation -= _bfd_x86_elf_dtpoff_base (info);
3499 }
3500 else if (r_type == R_386_TLS_LE_32)
3501 relocation = elf_i386_tpoff (info, relocation);
3502 else
3503 relocation = -elf_i386_tpoff (info, relocation);
3504 break;
3505
3506 default:
3507 break;
3508 }
3509
3510 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3511 because such sections are not SEC_ALLOC and thus ld.so will
3512 not process them. */
3513 if (unresolved_reloc
3514 && !((input_section->flags & SEC_DEBUGGING) != 0
3515 && h->def_dynamic)
3516 && _bfd_elf_section_offset (output_bfd, info, input_section,
3517 rel->r_offset) != (bfd_vma) -1)
3518 {
3519 _bfd_error_handler
3520 /* xgettext:c-format */
3521 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3522 input_bfd,
3523 input_section,
3524 rel->r_offset,
3525 howto->name,
3526 h->root.root.string);
3527 return FALSE;
3528 }
3529
3530 do_relocation:
3531 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3532 contents, rel->r_offset,
3533 relocation, 0);
3534
3535 check_relocation_error:
3536 if (r != bfd_reloc_ok)
3537 {
3538 const char *name;
3539
3540 if (h != NULL)
3541 name = h->root.root.string;
3542 else
3543 {
3544 name = bfd_elf_string_from_elf_section (input_bfd,
3545 symtab_hdr->sh_link,
3546 sym->st_name);
3547 if (name == NULL)
3548 return FALSE;
3549 if (*name == '\0')
3550 name = bfd_section_name (input_bfd, sec);
3551 }
3552
3553 if (r == bfd_reloc_overflow)
3554 (*info->callbacks->reloc_overflow)
3555 (info, (h ? &h->root : NULL), name, howto->name,
3556 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3557 else
3558 {
3559 _bfd_error_handler
3560 /* xgettext:c-format */
3561 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3562 input_bfd, input_section,
3563 rel->r_offset, name, (int) r);
3564 return FALSE;
3565 }
3566 }
3567
3568 if (wrel != rel)
3569 *wrel = *rel;
3570 }
3571
3572 if (wrel != rel)
3573 {
3574 Elf_Internal_Shdr *rel_hdr;
3575 size_t deleted = rel - wrel;
3576
3577 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3578 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3579 if (rel_hdr->sh_size == 0)
3580 {
3581 /* It is too late to remove an empty reloc section. Leave
3582 one NONE reloc.
3583 ??? What is wrong with an empty section??? */
3584 rel_hdr->sh_size = rel_hdr->sh_entsize;
3585 deleted -= 1;
3586 }
3587 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3588 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3589 input_section->reloc_count -= deleted;
3590 }
3591
3592 return TRUE;
3593 }
3594
3595 /* Finish up dynamic symbol handling. We set the contents of various
3596 dynamic sections here. */
3597
3598 static bfd_boolean
3599 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3600 struct bfd_link_info *info,
3601 struct elf_link_hash_entry *h,
3602 Elf_Internal_Sym *sym)
3603 {
3604 struct elf_x86_link_hash_table *htab;
3605 unsigned plt_entry_size;
3606 struct elf_x86_link_hash_entry *eh;
3607 bfd_boolean local_undefweak;
3608 bfd_boolean use_plt_second;
3609
3610 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3611 if (htab == NULL)
3612 return FALSE;
3613
3614 plt_entry_size = htab->plt.plt_entry_size;
3615
3616 /* Use the second PLT section only if there is .plt section. */
3617 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3618
3619 eh = (struct elf_x86_link_hash_entry *) h;
3620 if (eh->no_finish_dynamic_symbol)
3621 abort ();
3622
3623 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3624 resolved undefined weak symbols in executable so that their
3625 references have value 0 at run-time. */
3626 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, I386_ELF_DATA,
3627 eh->has_got_reloc,
3628 eh);
3629
3630 if (h->plt.offset != (bfd_vma) -1)
3631 {
3632 bfd_vma plt_index, plt_offset;
3633 bfd_vma got_offset;
3634 Elf_Internal_Rela rel;
3635 bfd_byte *loc;
3636 asection *plt, *resolved_plt, *gotplt, *relplt;
3637
3638 /* When building a static executable, use .iplt, .igot.plt and
3639 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3640 if (htab->elf.splt != NULL)
3641 {
3642 plt = htab->elf.splt;
3643 gotplt = htab->elf.sgotplt;
3644 relplt = htab->elf.srelplt;
3645 }
3646 else
3647 {
3648 plt = htab->elf.iplt;
3649 gotplt = htab->elf.igotplt;
3650 relplt = htab->elf.irelplt;
3651 }
3652
3653 /* This symbol has an entry in the procedure linkage table. Set
3654 it up. */
3655
3656 if ((h->dynindx == -1
3657 && !local_undefweak
3658 && !((h->forced_local || bfd_link_executable (info))
3659 && h->def_regular
3660 && h->type == STT_GNU_IFUNC))
3661 || plt == NULL
3662 || gotplt == NULL
3663 || relplt == NULL)
3664 abort ();
3665
3666 /* Get the index in the procedure linkage table which
3667 corresponds to this symbol. This is the index of this symbol
3668 in all the symbols for which we are making plt entries. The
3669 first entry in the procedure linkage table is reserved.
3670
3671 Get the offset into the .got table of the entry that
3672 corresponds to this function. Each .got entry is 4 bytes.
3673 The first three are reserved.
3674
3675 For static executables, we don't reserve anything. */
3676
3677 if (plt == htab->elf.splt)
3678 {
3679 got_offset = (h->plt.offset / plt_entry_size
3680 - htab->plt.has_plt0);
3681 got_offset = (got_offset + 3) * 4;
3682 }
3683 else
3684 {
3685 got_offset = h->plt.offset / plt_entry_size;
3686 got_offset = got_offset * 4;
3687 }
3688
3689 /* Fill in the entry in the procedure linkage table and update
3690 the first slot. */
3691 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3692 plt_entry_size);
3693
3694 if (use_plt_second)
3695 {
3696 const bfd_byte *plt_entry;
3697 if (bfd_link_pic (info))
3698 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3699 else
3700 plt_entry = htab->non_lazy_plt->plt_entry;
3701 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3702 plt_entry, htab->non_lazy_plt->plt_entry_size);
3703
3704 resolved_plt = htab->plt_second;
3705 plt_offset = eh->plt_second.offset;
3706 }
3707 else
3708 {
3709 resolved_plt = plt;
3710 plt_offset = h->plt.offset;
3711 }
3712
3713 if (! bfd_link_pic (info))
3714 {
3715 bfd_put_32 (output_bfd,
3716 (gotplt->output_section->vma
3717 + gotplt->output_offset
3718 + got_offset),
3719 resolved_plt->contents + plt_offset
3720 + htab->plt.plt_got_offset);
3721
3722 if (htab->is_vxworks)
3723 {
3724 int s, k, reloc_index;
3725
3726 /* Create the R_386_32 relocation referencing the GOT
3727 for this PLT entry. */
3728
3729 /* S: Current slot number (zero-based). */
3730 s = ((h->plt.offset - htab->plt.plt_entry_size)
3731 / htab->plt.plt_entry_size);
3732 /* K: Number of relocations for PLTResolve. */
3733 if (bfd_link_pic (info))
3734 k = PLTRESOLVE_RELOCS_SHLIB;
3735 else
3736 k = PLTRESOLVE_RELOCS;
3737 /* Skip the PLTresolve relocations, and the relocations for
3738 the other PLT slots. */
3739 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3740 loc = (htab->srelplt2->contents + reloc_index
3741 * sizeof (Elf32_External_Rel));
3742
3743 rel.r_offset = (plt->output_section->vma
3744 + plt->output_offset
3745 + h->plt.offset + 2),
3746 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3747 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3748
3749 /* Create the R_386_32 relocation referencing the beginning of
3750 the PLT for this GOT entry. */
3751 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3752 + htab->elf.sgotplt->output_offset
3753 + got_offset);
3754 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3755 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3756 loc + sizeof (Elf32_External_Rel));
3757 }
3758 }
3759 else
3760 {
3761 bfd_put_32 (output_bfd, got_offset,
3762 resolved_plt->contents + plt_offset
3763 + htab->plt.plt_got_offset);
3764 }
3765
3766 /* Fill in the entry in the global offset table. Leave the entry
3767 as zero for undefined weak symbol in PIE. No PLT relocation
3768 against undefined weak symbol in PIE. */
3769 if (!local_undefweak)
3770 {
3771 if (htab->plt.has_plt0)
3772 bfd_put_32 (output_bfd,
3773 (plt->output_section->vma
3774 + plt->output_offset
3775 + h->plt.offset
3776 + htab->lazy_plt->plt_lazy_offset),
3777 gotplt->contents + got_offset);
3778
3779 /* Fill in the entry in the .rel.plt section. */
3780 rel.r_offset = (gotplt->output_section->vma
3781 + gotplt->output_offset
3782 + got_offset);
3783 if (h->dynindx == -1
3784 || ((bfd_link_executable (info)
3785 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3786 && h->def_regular
3787 && h->type == STT_GNU_IFUNC))
3788 {
3789 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3790 h->root.root.string,
3791 h->root.u.def.section->owner);
3792
3793 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3794 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3795 in the .got.plt section. */
3796 bfd_put_32 (output_bfd,
3797 (h->root.u.def.value
3798 + h->root.u.def.section->output_section->vma
3799 + h->root.u.def.section->output_offset),
3800 gotplt->contents + got_offset);
3801 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3802 /* R_386_IRELATIVE comes last. */
3803 plt_index = htab->next_irelative_index--;
3804 }
3805 else
3806 {
3807 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3808 plt_index = htab->next_jump_slot_index++;
3809 }
3810
3811 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3812 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3813
3814 /* Don't fill the second and third slots in PLT entry for
3815 static executables nor without PLT0. */
3816 if (plt == htab->elf.splt && htab->plt.has_plt0)
3817 {
3818 bfd_put_32 (output_bfd,
3819 plt_index * sizeof (Elf32_External_Rel),
3820 plt->contents + h->plt.offset
3821 + htab->lazy_plt->plt_reloc_offset);
3822 bfd_put_32 (output_bfd,
3823 - (h->plt.offset
3824 + htab->lazy_plt->plt_plt_offset + 4),
3825 (plt->contents + h->plt.offset
3826 + htab->lazy_plt->plt_plt_offset));
3827 }
3828 }
3829 }
3830 else if (eh->plt_got.offset != (bfd_vma) -1)
3831 {
3832 bfd_vma got_offset, plt_offset;
3833 asection *plt, *got, *gotplt;
3834 const bfd_byte *got_plt_entry;
3835
3836 /* Set the entry in the GOT procedure linkage table. */
3837 plt = htab->plt_got;
3838 got = htab->elf.sgot;
3839 gotplt = htab->elf.sgotplt;
3840 got_offset = h->got.offset;
3841
3842 if (got_offset == (bfd_vma) -1
3843 || plt == NULL
3844 || got == NULL
3845 || gotplt == NULL)
3846 abort ();
3847
3848 /* Fill in the entry in the GOT procedure linkage table. */
3849 if (! bfd_link_pic (info))
3850 {
3851 got_plt_entry = htab->non_lazy_plt->plt_entry;
3852 got_offset += got->output_section->vma + got->output_offset;
3853 }
3854 else
3855 {
3856 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3857 got_offset += (got->output_section->vma
3858 + got->output_offset
3859 - gotplt->output_section->vma
3860 - gotplt->output_offset);
3861 }
3862
3863 plt_offset = eh->plt_got.offset;
3864 memcpy (plt->contents + plt_offset, got_plt_entry,
3865 htab->non_lazy_plt->plt_entry_size);
3866 bfd_put_32 (output_bfd, got_offset,
3867 (plt->contents + plt_offset
3868 + htab->non_lazy_plt->plt_got_offset));
3869 }
3870
3871 if (!local_undefweak
3872 && !h->def_regular
3873 && (h->plt.offset != (bfd_vma) -1
3874 || eh->plt_got.offset != (bfd_vma) -1))
3875 {
3876 /* Mark the symbol as undefined, rather than as defined in
3877 the .plt section. Leave the value if there were any
3878 relocations where pointer equality matters (this is a clue
3879 for the dynamic linker, to make function pointer
3880 comparisons work between an application and shared
3881 library), otherwise set it to zero. If a function is only
3882 called from a binary, there is no need to slow down
3883 shared libraries because of that. */
3884 sym->st_shndx = SHN_UNDEF;
3885 if (!h->pointer_equality_needed)
3886 sym->st_value = 0;
3887 }
3888
3889 /* Don't generate dynamic GOT relocation against undefined weak
3890 symbol in executable. */
3891 if (h->got.offset != (bfd_vma) -1
3892 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3893 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3894 && !local_undefweak)
3895 {
3896 Elf_Internal_Rela rel;
3897 asection *relgot = htab->elf.srelgot;
3898
3899 /* This symbol has an entry in the global offset table. Set it
3900 up. */
3901
3902 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3903 abort ();
3904
3905 rel.r_offset = (htab->elf.sgot->output_section->vma
3906 + htab->elf.sgot->output_offset
3907 + (h->got.offset & ~(bfd_vma) 1));
3908
3909 /* If this is a static link, or it is a -Bsymbolic link and the
3910 symbol is defined locally or was forced to be local because
3911 of a version file, we just want to emit a RELATIVE reloc.
3912 The entry in the global offset table will already have been
3913 initialized in the relocate_section function. */
3914 if (h->def_regular
3915 && h->type == STT_GNU_IFUNC)
3916 {
3917 if (h->plt.offset == (bfd_vma) -1)
3918 {
3919 /* STT_GNU_IFUNC is referenced without PLT. */
3920 if (htab->elf.splt == NULL)
3921 {
3922 /* use .rel[a].iplt section to store .got relocations
3923 in static executable. */
3924 relgot = htab->elf.irelplt;
3925 }
3926 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3927 {
3928 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3929 h->root.root.string,
3930 h->root.u.def.section->owner);
3931
3932 bfd_put_32 (output_bfd,
3933 (h->root.u.def.value
3934 + h->root.u.def.section->output_section->vma
3935 + h->root.u.def.section->output_offset),
3936 htab->elf.sgot->contents + h->got.offset);
3937 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3938 }
3939 else
3940 goto do_glob_dat;
3941 }
3942 else if (bfd_link_pic (info))
3943 {
3944 /* Generate R_386_GLOB_DAT. */
3945 goto do_glob_dat;
3946 }
3947 else
3948 {
3949 asection *plt;
3950 bfd_vma plt_offset;
3951
3952 if (!h->pointer_equality_needed)
3953 abort ();
3954
3955 /* For non-shared object, we can't use .got.plt, which
3956 contains the real function addres if we need pointer
3957 equality. We load the GOT entry with the PLT entry. */
3958 if (htab->plt_second != NULL)
3959 {
3960 plt = htab->plt_second;
3961 plt_offset = eh->plt_second.offset;
3962 }
3963 else
3964 {
3965 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3966 plt_offset = h->plt.offset;
3967 }
3968 bfd_put_32 (output_bfd,
3969 (plt->output_section->vma
3970 + plt->output_offset + plt_offset),
3971 htab->elf.sgot->contents + h->got.offset);
3972 return TRUE;
3973 }
3974 }
3975 else if (bfd_link_pic (info)
3976 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3977 {
3978 BFD_ASSERT((h->got.offset & 1) != 0);
3979 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3980 }
3981 else
3982 {
3983 BFD_ASSERT((h->got.offset & 1) == 0);
3984 do_glob_dat:
3985 bfd_put_32 (output_bfd, (bfd_vma) 0,
3986 htab->elf.sgot->contents + h->got.offset);
3987 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3988 }
3989
3990 elf_append_rel (output_bfd, relgot, &rel);
3991 }
3992
3993 if (h->needs_copy)
3994 {
3995 Elf_Internal_Rela rel;
3996 asection *s;
3997
3998 /* This symbol needs a copy reloc. Set it up. */
3999
4000 if (h->dynindx == -1
4001 || (h->root.type != bfd_link_hash_defined
4002 && h->root.type != bfd_link_hash_defweak)
4003 || htab->elf.srelbss == NULL
4004 || htab->elf.sreldynrelro == NULL)
4005 abort ();
4006
4007 rel.r_offset = (h->root.u.def.value
4008 + h->root.u.def.section->output_section->vma
4009 + h->root.u.def.section->output_offset);
4010 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4011 if (h->root.u.def.section == htab->elf.sdynrelro)
4012 s = htab->elf.sreldynrelro;
4013 else
4014 s = htab->elf.srelbss;
4015 elf_append_rel (output_bfd, s, &rel);
4016 }
4017
4018 return TRUE;
4019 }
4020
4021 /* Finish up local dynamic symbol handling. We set the contents of
4022 various dynamic sections here. */
4023
4024 static bfd_boolean
4025 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4026 {
4027 struct elf_link_hash_entry *h
4028 = (struct elf_link_hash_entry *) *slot;
4029 struct bfd_link_info *info
4030 = (struct bfd_link_info *) inf;
4031
4032 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4033 h, NULL);
4034 }
4035
4036 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4037 here since undefined weak symbol may not be dynamic and may not be
4038 called for elf_i386_finish_dynamic_symbol. */
4039
4040 static bfd_boolean
4041 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4042 void *inf)
4043 {
4044 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4045 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4046
4047 if (h->root.type != bfd_link_hash_undefweak
4048 || h->dynindx != -1)
4049 return TRUE;
4050
4051 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4052 info, h, NULL);
4053 }
4054
4055 /* Used to decide how to sort relocs in an optimal manner for the
4056 dynamic linker, before writing them out. */
4057
4058 static enum elf_reloc_type_class
4059 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4060 const asection *rel_sec ATTRIBUTE_UNUSED,
4061 const Elf_Internal_Rela *rela)
4062 {
4063 bfd *abfd = info->output_bfd;
4064 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4065 struct elf_link_hash_table *htab = elf_hash_table (info);
4066
4067 if (htab->dynsym != NULL
4068 && htab->dynsym->contents != NULL)
4069 {
4070 /* Check relocation against STT_GNU_IFUNC symbol if there are
4071 dynamic symbols. */
4072 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4073 if (r_symndx != STN_UNDEF)
4074 {
4075 Elf_Internal_Sym sym;
4076 if (!bed->s->swap_symbol_in (abfd,
4077 (htab->dynsym->contents
4078 + r_symndx * sizeof (Elf32_External_Sym)),
4079 0, &sym))
4080 abort ();
4081
4082 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4083 return reloc_class_ifunc;
4084 }
4085 }
4086
4087 switch (ELF32_R_TYPE (rela->r_info))
4088 {
4089 case R_386_IRELATIVE:
4090 return reloc_class_ifunc;
4091 case R_386_RELATIVE:
4092 return reloc_class_relative;
4093 case R_386_JUMP_SLOT:
4094 return reloc_class_plt;
4095 case R_386_COPY:
4096 return reloc_class_copy;
4097 default:
4098 return reloc_class_normal;
4099 }
4100 }
4101
4102 /* Finish up the dynamic sections. */
4103
4104 static bfd_boolean
4105 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4106 struct bfd_link_info *info)
4107 {
4108 struct elf_x86_link_hash_table *htab;
4109 bfd *dynobj;
4110 asection *sdyn;
4111 const struct elf_i386_backend_data *abed;
4112
4113 htab = elf_x86_hash_table (info, I386_ELF_DATA);
4114 if (htab == NULL)
4115 return FALSE;
4116
4117 dynobj = htab->elf.dynobj;
4118 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4119 abed = get_elf_i386_backend_data (output_bfd);
4120
4121 if (htab->elf.dynamic_sections_created)
4122 {
4123 Elf32_External_Dyn *dyncon, *dynconend;
4124
4125 if (sdyn == NULL || htab->elf.sgot == NULL)
4126 abort ();
4127
4128 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4129 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4130 for (; dyncon < dynconend; dyncon++)
4131 {
4132 Elf_Internal_Dyn dyn;
4133 asection *s;
4134
4135 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4136
4137 switch (dyn.d_tag)
4138 {
4139 default:
4140 if (htab->is_vxworks
4141 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4142 break;
4143 continue;
4144
4145 case DT_PLTGOT:
4146 s = htab->elf.sgotplt;
4147 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4148 break;
4149
4150 case DT_JMPREL:
4151 s = htab->elf.srelplt;
4152 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4153 break;
4154
4155 case DT_PLTRELSZ:
4156 s = htab->elf.srelplt;
4157 dyn.d_un.d_val = s->size;
4158 break;
4159 }
4160
4161 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4162 }
4163
4164 if (htab->elf.splt && htab->elf.splt->size > 0)
4165 {
4166 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4167 really seem like the right value. */
4168 elf_section_data (htab->elf.splt->output_section)
4169 ->this_hdr.sh_entsize = 4;
4170
4171 if (htab->plt.has_plt0)
4172 {
4173 /* Fill in the special first entry in the procedure linkage
4174 table. */
4175 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4176 htab->lazy_plt->plt0_entry_size);
4177 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4178 abed->plt0_pad_byte,
4179 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4180 if (!bfd_link_pic (info))
4181 {
4182 bfd_put_32 (output_bfd,
4183 (htab->elf.sgotplt->output_section->vma
4184 + htab->elf.sgotplt->output_offset
4185 + 4),
4186 htab->elf.splt->contents
4187 + htab->lazy_plt->plt0_got1_offset);
4188 bfd_put_32 (output_bfd,
4189 (htab->elf.sgotplt->output_section->vma
4190 + htab->elf.sgotplt->output_offset
4191 + 8),
4192 htab->elf.splt->contents
4193 + htab->lazy_plt->plt0_got2_offset);
4194
4195 if (htab->is_vxworks)
4196 {
4197 Elf_Internal_Rela rel;
4198 int num_plts = (htab->elf.splt->size
4199 / htab->plt.plt_entry_size) - 1;
4200 unsigned char *p;
4201 asection *srelplt2 = htab->srelplt2;
4202
4203 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4204 + 4. On IA32 we use REL relocations so the
4205 addend goes in the PLT directly. */
4206 rel.r_offset = (htab->elf.splt->output_section->vma
4207 + htab->elf.splt->output_offset
4208 + htab->lazy_plt->plt0_got1_offset);
4209 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4210 R_386_32);
4211 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4212 srelplt2->contents);
4213 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4214 + 8. */
4215 rel.r_offset = (htab->elf.splt->output_section->vma
4216 + htab->elf.splt->output_offset
4217 + htab->lazy_plt->plt0_got2_offset);
4218 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4219 R_386_32);
4220 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4221 srelplt2->contents +
4222 sizeof (Elf32_External_Rel));
4223 /* Correct the .rel.plt.unloaded relocations. */
4224 p = srelplt2->contents;
4225 if (bfd_link_pic (info))
4226 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4227 else
4228 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4229
4230 for (; num_plts; num_plts--)
4231 {
4232 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4233 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4234 R_386_32);
4235 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4236 p += sizeof (Elf32_External_Rel);
4237
4238 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4239 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4240 R_386_32);
4241 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4242 p += sizeof (Elf32_External_Rel);
4243 }
4244 }
4245 }
4246 }
4247 }
4248
4249 if (htab->plt_got != NULL && htab->plt_got->size > 0)
4250 elf_section_data (htab->plt_got->output_section)
4251 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4252
4253 if (htab->plt_second != NULL && htab->plt_second->size > 0)
4254 elf_section_data (htab->plt_second->output_section)
4255 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4256 }
4257
4258 /* Fill in the first three entries in the global offset table. */
4259 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
4260 {
4261 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4262 {
4263 _bfd_error_handler
4264 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4265 return FALSE;
4266 }
4267
4268 bfd_put_32 (output_bfd,
4269 (sdyn == NULL ? 0
4270 : sdyn->output_section->vma + sdyn->output_offset),
4271 htab->elf.sgotplt->contents);
4272 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4273 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4274
4275 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4276 }
4277
4278 /* Adjust .eh_frame for .plt section. */
4279 if (htab->plt_eh_frame != NULL
4280 && htab->plt_eh_frame->contents != NULL)
4281 {
4282 if (htab->elf.splt != NULL
4283 && htab->elf.splt->size != 0
4284 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4285 && htab->elf.splt->output_section != NULL
4286 && htab->plt_eh_frame->output_section != NULL)
4287 {
4288 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4289 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4290 + htab->plt_eh_frame->output_offset
4291 + PLT_FDE_START_OFFSET;
4292 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4293 htab->plt_eh_frame->contents
4294 + PLT_FDE_START_OFFSET);
4295 }
4296 if (htab->plt_eh_frame->sec_info_type
4297 == SEC_INFO_TYPE_EH_FRAME)
4298 {
4299 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4300 htab->plt_eh_frame,
4301 htab->plt_eh_frame->contents))
4302 return FALSE;
4303 }
4304 }
4305
4306 /* Adjust .eh_frame for .plt.got section. */
4307 if (htab->plt_got_eh_frame != NULL
4308 && htab->plt_got_eh_frame->contents != NULL)
4309 {
4310 if (htab->plt_got != NULL
4311 && htab->plt_got->size != 0
4312 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
4313 && htab->plt_got->output_section != NULL
4314 && htab->plt_got_eh_frame->output_section != NULL)
4315 {
4316 bfd_vma plt_start = htab->plt_got->output_section->vma;
4317 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
4318 + htab->plt_got_eh_frame->output_offset
4319 + PLT_FDE_START_OFFSET;
4320 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4321 htab->plt_got_eh_frame->contents
4322 + PLT_FDE_START_OFFSET);
4323 }
4324 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4325 {
4326 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4327 htab->plt_got_eh_frame,
4328 htab->plt_got_eh_frame->contents))
4329 return FALSE;
4330 }
4331 }
4332
4333 /* Adjust .eh_frame for the second PLT section. */
4334 if (htab->plt_second_eh_frame != NULL
4335 && htab->plt_second_eh_frame->contents != NULL)
4336 {
4337 if (htab->plt_second != NULL
4338 && htab->plt_second->size != 0
4339 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
4340 && htab->plt_second->output_section != NULL
4341 && htab->plt_second_eh_frame->output_section != NULL)
4342 {
4343 bfd_vma plt_start = htab->plt_second->output_section->vma;
4344 bfd_vma eh_frame_start
4345 = (htab->plt_second_eh_frame->output_section->vma
4346 + htab->plt_second_eh_frame->output_offset
4347 + PLT_FDE_START_OFFSET);
4348 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4349 htab->plt_second_eh_frame->contents
4350 + PLT_FDE_START_OFFSET);
4351 }
4352 if (htab->plt_second_eh_frame->sec_info_type
4353 == SEC_INFO_TYPE_EH_FRAME)
4354 {
4355 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4356 htab->plt_second_eh_frame,
4357 htab->plt_second_eh_frame->contents))
4358 return FALSE;
4359 }
4360 }
4361
4362 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4363 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4364
4365 /* Fill PLT entries for undefined weak symbols in PIE. */
4366 if (bfd_link_pie (info))
4367 bfd_hash_traverse (&info->hash->table,
4368 elf_i386_pie_finish_undefweak_symbol,
4369 info);
4370
4371 return TRUE;
4372 }
4373
4374 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4375 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4376 It has to be done before elf_link_sort_relocs is called so that
4377 dynamic relocations are properly sorted. */
4378
4379 static bfd_boolean
4380 elf_i386_output_arch_local_syms
4381 (bfd *output_bfd ATTRIBUTE_UNUSED,
4382 struct bfd_link_info *info,
4383 void *flaginfo ATTRIBUTE_UNUSED,
4384 int (*func) (void *, const char *,
4385 Elf_Internal_Sym *,
4386 asection *,
4387 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4388 {
4389 struct elf_x86_link_hash_table *htab
4390 = elf_x86_hash_table (info, I386_ELF_DATA);
4391 if (htab == NULL)
4392 return FALSE;
4393
4394 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4395 htab_traverse (htab->loc_hash_table,
4396 elf_i386_finish_local_dynamic_symbol,
4397 info);
4398
4399 return TRUE;
4400 }
4401
4402 /* Forward declaration. */
4403 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4404
4405 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4406 dynamic relocations. */
4407
4408 static long
4409 elf_i386_get_synthetic_symtab (bfd *abfd,
4410 long symcount ATTRIBUTE_UNUSED,
4411 asymbol **syms ATTRIBUTE_UNUSED,
4412 long dynsymcount,
4413 asymbol **dynsyms,
4414 asymbol **ret)
4415 {
4416 long count, i, n;
4417 int j;
4418 bfd_byte *plt_contents;
4419 long relsize;
4420 const struct elf_x86_lazy_plt_layout *lazy_plt;
4421 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4422 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4423 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4424 asection *plt;
4425 bfd_vma got_addr;
4426 enum elf_x86_plt_type plt_type;
4427 struct elf_x86_plt plts[] =
4428 {
4429 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4430 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4431 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4432 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4433 };
4434
4435 *ret = NULL;
4436
4437 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4438 return 0;
4439
4440 if (dynsymcount <= 0)
4441 return 0;
4442
4443 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4444 if (relsize <= 0)
4445 return -1;
4446
4447 non_lazy_plt = NULL;
4448 /* Silence GCC 6. */
4449 lazy_plt = NULL;
4450 non_lazy_ibt_plt = NULL;
4451 lazy_ibt_plt = NULL;
4452 switch (get_elf_i386_backend_data (abfd)->os)
4453 {
4454 case is_normal:
4455 non_lazy_plt = &elf_i386_non_lazy_plt;
4456 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4457 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4458 /* Fall through */
4459 case is_vxworks:
4460 lazy_plt = &elf_i386_lazy_plt;
4461 break;
4462 case is_nacl:
4463 lazy_plt = &elf_i386_nacl_plt;
4464 break;
4465 }
4466
4467 got_addr = 0;
4468
4469 count = 0;
4470 for (j = 0; plts[j].name != NULL; j++)
4471 {
4472 plt = bfd_get_section_by_name (abfd, plts[j].name);
4473 if (plt == NULL || plt->size == 0)
4474 continue;
4475
4476 /* Get the PLT section contents. */
4477 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4478 if (plt_contents == NULL)
4479 break;
4480 if (!bfd_get_section_contents (abfd, (asection *) plt,
4481 plt_contents, 0, plt->size))
4482 {
4483 free (plt_contents);
4484 break;
4485 }
4486
4487 /* Check what kind of PLT it is. */
4488 plt_type = plt_unknown;
4489 if (plts[j].type == plt_unknown
4490 && (plt->size >= (lazy_plt->plt0_entry_size
4491 + lazy_plt->plt_entry_size)))
4492 {
4493 /* Match lazy PLT first. */
4494 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4495 lazy_plt->plt0_got1_offset) == 0)
4496 {
4497 /* The fist entry in the lazy IBT PLT is the same as the
4498 normal lazy PLT. */
4499 if (lazy_ibt_plt != NULL
4500 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4501 lazy_ibt_plt->plt_entry,
4502 lazy_ibt_plt->plt_got_offset) == 0))
4503 plt_type = plt_lazy | plt_second;
4504 else
4505 plt_type = plt_lazy;
4506 }
4507 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4508 lazy_plt->plt0_got1_offset) == 0)
4509 {
4510 /* The fist entry in the PIC lazy IBT PLT is the same as
4511 the normal PIC lazy PLT. */
4512 if (lazy_ibt_plt != NULL
4513 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4514 lazy_ibt_plt->pic_plt_entry,
4515 lazy_ibt_plt->plt_got_offset) == 0))
4516 plt_type = plt_lazy | plt_pic | plt_second;
4517 else
4518 plt_type = plt_lazy | plt_pic;
4519 }
4520 }
4521
4522 if (non_lazy_plt != NULL
4523 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4524 && plt->size >= non_lazy_plt->plt_entry_size)
4525 {
4526 /* Match non-lazy PLT. */
4527 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4528 non_lazy_plt->plt_got_offset) == 0)
4529 plt_type = plt_non_lazy;
4530 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4531 non_lazy_plt->plt_got_offset) == 0)
4532 plt_type = plt_pic;
4533 }
4534
4535 if ((non_lazy_ibt_plt != NULL)
4536 && (plt_type == plt_unknown || plt_type == plt_second)
4537 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4538 {
4539 if (memcmp (plt_contents,
4540 non_lazy_ibt_plt->plt_entry,
4541 non_lazy_ibt_plt->plt_got_offset) == 0)
4542 {
4543 /* Match IBT PLT. */
4544 plt_type = plt_second;
4545 non_lazy_plt = non_lazy_ibt_plt;
4546 }
4547 else if (memcmp (plt_contents,
4548 non_lazy_ibt_plt->pic_plt_entry,
4549 non_lazy_ibt_plt->plt_got_offset) == 0)
4550 {
4551 /* Match PIC IBT PLT. */
4552 plt_type = plt_second | plt_pic;
4553 non_lazy_plt = non_lazy_ibt_plt;
4554 }
4555 }
4556
4557 if (plt_type == plt_unknown)
4558 {
4559 free (plt_contents);
4560 continue;
4561 }
4562
4563 plts[j].sec = plt;
4564 plts[j].type = plt_type;
4565
4566 if ((plt_type & plt_lazy))
4567 {
4568 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4569 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4570 /* Skip PLT0 in lazy PLT. */
4571 i = 1;
4572 }
4573 else
4574 {
4575 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4576 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4577 i = 0;
4578 }
4579
4580 /* Skip lazy PLT when the second PLT is used. */
4581 if ((plt_type & (plt_lazy | plt_second))
4582 == (plt_lazy | plt_second))
4583 plts[j].count = 0;
4584 else
4585 {
4586 n = plt->size / plts[j].plt_entry_size;
4587 plts[j].count = n;
4588 count += n - i;
4589 }
4590
4591 plts[j].contents = plt_contents;
4592
4593 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4594 if ((plt_type & plt_pic))
4595 got_addr = (bfd_vma) -1;
4596 }
4597
4598 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4599 got_addr, plts, dynsyms,
4600 ret);
4601 }
4602
4603 /* Set up i386 GNU properties. Return the first relocatable ELF input
4604 with GNU properties if found. Otherwise, return NULL. */
4605
4606 static bfd *
4607 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4608 {
4609 struct elf_x86_init_table init_table;
4610
4611 init_table.normal_target = FALSE;
4612 init_table.is_vxworks = FALSE;
4613 switch (get_elf_i386_backend_data (info->output_bfd)->os)
4614 {
4615 case is_normal:
4616 init_table.lazy_plt = &elf_i386_lazy_plt;
4617 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4618 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4619 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4620 init_table.normal_target = TRUE;
4621 break;
4622 case is_vxworks:
4623 init_table.lazy_plt = &elf_i386_lazy_plt;
4624 init_table.non_lazy_plt = NULL;
4625 init_table.lazy_ibt_plt = NULL;
4626 init_table.non_lazy_ibt_plt = NULL;
4627 init_table.is_vxworks = TRUE;
4628 break;
4629 case is_nacl:
4630 init_table.lazy_plt = &elf_i386_nacl_plt;
4631 init_table.non_lazy_plt = NULL;
4632 init_table.lazy_ibt_plt = NULL;
4633 init_table.non_lazy_ibt_plt = NULL;
4634 break;
4635 }
4636
4637 init_table.r_info = elf32_r_info;
4638 init_table.r_sym = elf32_r_sym;
4639
4640 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4641 }
4642
4643 #define TARGET_LITTLE_SYM i386_elf32_vec
4644 #define TARGET_LITTLE_NAME "elf32-i386"
4645 #define ELF_ARCH bfd_arch_i386
4646 #define ELF_TARGET_ID I386_ELF_DATA
4647 #define ELF_MACHINE_CODE EM_386
4648 #define ELF_MAXPAGESIZE 0x1000
4649
4650 #define elf_backend_can_gc_sections 1
4651 #define elf_backend_can_refcount 1
4652 #define elf_backend_want_got_plt 1
4653 #define elf_backend_plt_readonly 1
4654 #define elf_backend_want_plt_sym 0
4655 #define elf_backend_got_header_size 12
4656 #define elf_backend_plt_alignment 4
4657 #define elf_backend_dtrel_excludes_plt 1
4658 #define elf_backend_extern_protected_data 1
4659 #define elf_backend_caches_rawsize 1
4660 #define elf_backend_want_dynrelro 1
4661
4662 /* Support RELA for objdump of prelink objects. */
4663 #define elf_info_to_howto elf_i386_info_to_howto_rel
4664 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4665
4666 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4667 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4668 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4669 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4670
4671 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4672 #define elf_backend_check_relocs elf_i386_check_relocs
4673 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4674 #define elf_backend_fake_sections elf_i386_fake_sections
4675 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4676 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4677 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4678 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4679 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4680 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4681 #define elf_backend_relocate_section elf_i386_relocate_section
4682 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4683
4684 #include "elf32-target.h"
4685
4686 /* FreeBSD support. */
4687
4688 #undef TARGET_LITTLE_SYM
4689 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4690 #undef TARGET_LITTLE_NAME
4691 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4692 #undef ELF_OSABI
4693 #define ELF_OSABI ELFOSABI_FREEBSD
4694
4695 /* The kernel recognizes executables as valid only if they carry a
4696 "FreeBSD" label in the ELF header. So we put this label on all
4697 executables and (for simplicity) also all other object files. */
4698
4699 static void
4700 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4701 {
4702 _bfd_elf_post_process_headers (abfd, info);
4703
4704 #ifdef OLD_FREEBSD_ABI_LABEL
4705 {
4706 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4707 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4708 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4709 }
4710 #endif
4711 }
4712
4713 #undef elf_backend_post_process_headers
4714 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4715 #undef elf32_bed
4716 #define elf32_bed elf32_i386_fbsd_bed
4717
4718 #undef elf_backend_add_symbol_hook
4719
4720 #include "elf32-target.h"
4721
4722 /* Solaris 2. */
4723
4724 #undef TARGET_LITTLE_SYM
4725 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4726 #undef TARGET_LITTLE_NAME
4727 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4728
4729 #undef elf_backend_post_process_headers
4730
4731 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4732 objects won't be recognized. */
4733 #undef ELF_OSABI
4734
4735 #undef elf32_bed
4736 #define elf32_bed elf32_i386_sol2_bed
4737
4738 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4739 boundary. */
4740 #undef elf_backend_static_tls_alignment
4741 #define elf_backend_static_tls_alignment 8
4742
4743 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4744
4745 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4746 File, p.63. */
4747 #undef elf_backend_want_plt_sym
4748 #define elf_backend_want_plt_sym 1
4749
4750 #undef elf_backend_strtab_flags
4751 #define elf_backend_strtab_flags SHF_STRINGS
4752
4753 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4754 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4755 FALSE otherwise. ISECTION is the best guess matching section from the
4756 input bfd IBFD, but it might be NULL. */
4757
4758 static bfd_boolean
4759 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4760 bfd *obfd ATTRIBUTE_UNUSED,
4761 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4762 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4763 {
4764 /* PR 19938: FIXME: Need to add code for setting the sh_info
4765 and sh_link fields of Solaris specific section types. */
4766 return FALSE;
4767
4768 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4769 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4770
4771 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4772
4773 The following values should be set:
4774
4775 Type Link Info
4776 -----------------------------------------------------------------------------
4777 SHT_SUNW_ancillary The section header index of 0
4778 [0x6fffffee] the associated string table.
4779
4780 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4781 [0x6ffffff0] the associated symbol table. section header index of
4782 the associated
4783 SHT_SUNW_capchain table,
4784 otherwise 0.
4785
4786 SHT_SUNW_symsort The section header index of 0
4787 [0x6ffffff1] the associated symbol table.
4788
4789 SHT_SUNW_tlssort The section header index of 0
4790 [0x6ffffff2] the associated symbol table.
4791
4792 SHT_SUNW_LDYNSYM The section header index of One greater than the
4793 [0x6ffffff3] the associated string table. symbol table index of the
4794 This index is the same string last local symbol,
4795 table used by the SHT_DYNSYM STB_LOCAL. Since
4796 section. SHT_SUNW_LDYNSYM only
4797 contains local symbols,
4798 sh_info is equivalent to
4799 the number of symbols in
4800 the table.
4801
4802 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4803 [0x6ffffff5] the section header index of to named strings, the
4804 the associated section header index of
4805 SHT_SUNW_capinfo table, the associated string
4806 otherwise 0. table, otherwise 0.
4807
4808 SHT_SUNW_move The section header index of 0
4809 [0x6ffffffa] the associated symbol table.
4810
4811 SHT_SUNW_COMDAT 0 0
4812 [0x6ffffffb]
4813
4814 SHT_SUNW_syminfo The section header index of The section header index
4815 [0x6ffffffc] the associated symbol table. of the associated
4816 .dynamic section.
4817
4818 SHT_SUNW_verdef The section header index of The number of version
4819 [0x6ffffffd] the associated string table. definitions within the
4820 section.
4821
4822 SHT_SUNW_verneed The section header index of The number of version
4823 [0x6ffffffe] the associated string table. dependencies within the
4824 section.
4825
4826 SHT_SUNW_versym The section header index of 0
4827 [0x6fffffff] the associated symbol table. */
4828 }
4829
4830 #undef elf_backend_copy_special_section_fields
4831 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4832
4833 #include "elf32-target.h"
4834
4835 /* Intel MCU support. */
4836
4837 static bfd_boolean
4838 elf32_iamcu_elf_object_p (bfd *abfd)
4839 {
4840 /* Set the right machine number for an IAMCU elf32 file. */
4841 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4842 return TRUE;
4843 }
4844
4845 #undef TARGET_LITTLE_SYM
4846 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4847 #undef TARGET_LITTLE_NAME
4848 #define TARGET_LITTLE_NAME "elf32-iamcu"
4849 #undef ELF_ARCH
4850 #define ELF_ARCH bfd_arch_iamcu
4851
4852 #undef ELF_MACHINE_CODE
4853 #define ELF_MACHINE_CODE EM_IAMCU
4854
4855 #undef ELF_OSABI
4856
4857 #undef elf32_bed
4858 #define elf32_bed elf32_iamcu_bed
4859
4860 #undef elf_backend_object_p
4861 #define elf_backend_object_p elf32_iamcu_elf_object_p
4862
4863 #undef elf_backend_static_tls_alignment
4864
4865 #undef elf_backend_want_plt_sym
4866 #define elf_backend_want_plt_sym 0
4867
4868 #undef elf_backend_strtab_flags
4869 #undef elf_backend_copy_special_section_fields
4870
4871 #include "elf32-target.h"
4872
4873 /* Restore defaults. */
4874 #undef ELF_ARCH
4875 #define ELF_ARCH bfd_arch_i386
4876 #undef ELF_MACHINE_CODE
4877 #define ELF_MACHINE_CODE EM_386
4878
4879 /* Native Client support. */
4880
4881 #undef TARGET_LITTLE_SYM
4882 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4883 #undef TARGET_LITTLE_NAME
4884 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4885 #undef elf32_bed
4886 #define elf32_bed elf32_i386_nacl_bed
4887
4888 #undef ELF_MAXPAGESIZE
4889 #define ELF_MAXPAGESIZE 0x10000
4890
4891 /* Restore defaults. */
4892 #undef ELF_OSABI
4893 #undef elf_backend_want_plt_sym
4894 #define elf_backend_want_plt_sym 0
4895 #undef elf_backend_post_process_headers
4896 #undef elf_backend_static_tls_alignment
4897
4898 /* NaCl uses substantially different PLT entries for the same effects. */
4899
4900 #undef elf_backend_plt_alignment
4901 #define elf_backend_plt_alignment 5
4902 #define NACL_PLT_ENTRY_SIZE 64
4903 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4904
4905 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4906 {
4907 0xff, 0x35, /* pushl contents of address */
4908 0, 0, 0, 0, /* replaced with address of .got + 4. */
4909 0x8b, 0x0d, /* movl contents of address, %ecx */
4910 0, 0, 0, 0, /* replaced with address of .got + 8. */
4911 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4912 0xff, 0xe1 /* jmp *%ecx */
4913 };
4914
4915 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4916 {
4917 0x8b, 0x0d, /* movl contents of address, %ecx */
4918 0, 0, 0, 0, /* replaced with GOT slot address. */
4919 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4920 0xff, 0xe1, /* jmp *%ecx */
4921
4922 /* Pad to the next 32-byte boundary with nop instructions. */
4923 0x90,
4924 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4925 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4926
4927 /* Lazy GOT entries point here (32-byte aligned). */
4928 0x68, /* pushl immediate */
4929 0, 0, 0, 0, /* replaced with reloc offset. */
4930 0xe9, /* jmp relative */
4931 0, 0, 0, 0, /* replaced with offset to .plt. */
4932
4933 /* Pad to the next 32-byte boundary with nop instructions. */
4934 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4935 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4936 0x90, 0x90
4937 };
4938
4939 static const bfd_byte
4940 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4941 {
4942 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4943 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4944 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4945 0xff, 0xe1, /* jmp *%ecx */
4946
4947 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4948 so pad to that size with nop instructions. */
4949 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4950 };
4951
4952 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4953 {
4954 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4955 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4956 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4957 0xff, 0xe1, /* jmp *%ecx */
4958
4959 /* Pad to the next 32-byte boundary with nop instructions. */
4960 0x90,
4961 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4962 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4963
4964 /* Lazy GOT entries point here (32-byte aligned). */
4965 0x68, /* pushl immediate */
4966 0, 0, 0, 0, /* replaced with offset into relocation table. */
4967 0xe9, /* jmp relative */
4968 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4969
4970 /* Pad to the next 32-byte boundary with nop instructions. */
4971 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4972 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4973 0x90, 0x90
4974 };
4975
4976 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4977 {
4978 #if (PLT_CIE_LENGTH != 20 \
4979 || PLT_FDE_LENGTH != 36 \
4980 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4981 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4982 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
4983 #endif
4984 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4985 0, 0, 0, 0, /* CIE ID */
4986 1, /* CIE version */
4987 'z', 'R', 0, /* Augmentation string */
4988 1, /* Code alignment factor */
4989 0x7c, /* Data alignment factor: -4 */
4990 8, /* Return address column */
4991 1, /* Augmentation size */
4992 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4993 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4994 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4995 DW_CFA_nop, DW_CFA_nop,
4996
4997 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4998 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4999 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5000 0, 0, 0, 0, /* .plt size goes here */
5001 0, /* Augmentation size */
5002 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5003 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5004 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5005 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5006 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5007 13, /* Block length */
5008 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5009 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5010 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5011 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5012 DW_CFA_nop, DW_CFA_nop
5013 };
5014
5015 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
5016 {
5017 elf_i386_nacl_plt0_entry, /* plt0_entry */
5018 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5019 elf_i386_nacl_plt_entry, /* plt_entry */
5020 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5021 2, /* plt0_got1_offset */
5022 8, /* plt0_got2_offset */
5023 0, /* plt0_got2_insn_end */
5024 2, /* plt_got_offset */
5025 33, /* plt_reloc_offset */
5026 38, /* plt_plt_offset */
5027 0, /* plt_got_insn_size */
5028 0, /* plt_plt_insn_end */
5029 32, /* plt_lazy_offset */
5030 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5031 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5032 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5033 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
5034 };
5035
5036 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5037 {
5038 0x90, /* plt0_pad_byte: nop insn */
5039 is_nacl /* os */
5040 };
5041
5042 static bfd_boolean
5043 elf32_i386_nacl_elf_object_p (bfd *abfd)
5044 {
5045 /* Set the right machine number for a NaCl i386 ELF32 file. */
5046 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5047 return TRUE;
5048 }
5049
5050 #undef elf_backend_arch_data
5051 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5052
5053 #undef elf_backend_object_p
5054 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5055 #undef elf_backend_modify_segment_map
5056 #define elf_backend_modify_segment_map nacl_modify_segment_map
5057 #undef elf_backend_modify_program_headers
5058 #define elf_backend_modify_program_headers nacl_modify_program_headers
5059 #undef elf_backend_final_write_processing
5060 #define elf_backend_final_write_processing nacl_final_write_processing
5061
5062 #include "elf32-target.h"
5063
5064 /* Restore defaults. */
5065 #undef elf_backend_object_p
5066 #undef elf_backend_modify_segment_map
5067 #undef elf_backend_modify_program_headers
5068 #undef elf_backend_final_write_processing
5069
5070 /* VxWorks support. */
5071
5072 #undef TARGET_LITTLE_SYM
5073 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5074 #undef TARGET_LITTLE_NAME
5075 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5076 #undef ELF_OSABI
5077 #undef ELF_MAXPAGESIZE
5078 #define ELF_MAXPAGESIZE 0x1000
5079 #undef elf_backend_plt_alignment
5080 #define elf_backend_plt_alignment 4
5081
5082 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5083 {
5084 0x90, /* plt0_pad_byte */
5085 is_vxworks /* os */
5086 };
5087
5088 #undef elf_backend_arch_data
5089 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5090
5091 #undef elf_backend_relocs_compatible
5092 #undef elf_backend_add_symbol_hook
5093 #define elf_backend_add_symbol_hook \
5094 elf_vxworks_add_symbol_hook
5095 #undef elf_backend_link_output_symbol_hook
5096 #define elf_backend_link_output_symbol_hook \
5097 elf_vxworks_link_output_symbol_hook
5098 #undef elf_backend_emit_relocs
5099 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5100 #undef elf_backend_final_write_processing
5101 #define elf_backend_final_write_processing \
5102 elf_vxworks_final_write_processing
5103 #undef elf_backend_static_tls_alignment
5104
5105 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5106 define it. */
5107 #undef elf_backend_want_plt_sym
5108 #define elf_backend_want_plt_sym 1
5109
5110 #undef elf32_bed
5111 #define elf32_bed elf32_i386_vxworks_bed
5112
5113 #include "elf32-target.h"