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x86: Add POINTER_LOCAL_IFUNC_P/PLT_LOCAL_IFUNC_P
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
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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
32static reloc_howto_type elf_howto_table[]=
33{
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72#define R_386_standard (R_386_GOTPC + 1)
73#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148#define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151/* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166/* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183};
184
185#define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
186
187#ifdef DEBUG_GEN_RELOC
188#define TRACE(str) \
189 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
190#else
191#define TRACE(str)
192#endif
193
194static reloc_howto_type *
195elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
196 bfd_reloc_code_real_type code)
197{
198 switch (code)
199 {
200 case BFD_RELOC_NONE:
201 TRACE ("BFD_RELOC_NONE");
202 return &elf_howto_table[R_386_NONE];
203
204 case BFD_RELOC_32:
205 TRACE ("BFD_RELOC_32");
206 return &elf_howto_table[R_386_32];
207
208 case BFD_RELOC_CTOR:
209 TRACE ("BFD_RELOC_CTOR");
210 return &elf_howto_table[R_386_32];
211
212 case BFD_RELOC_32_PCREL:
213 TRACE ("BFD_RELOC_PC32");
214 return &elf_howto_table[R_386_PC32];
215
216 case BFD_RELOC_386_GOT32:
217 TRACE ("BFD_RELOC_386_GOT32");
218 return &elf_howto_table[R_386_GOT32];
219
220 case BFD_RELOC_386_PLT32:
221 TRACE ("BFD_RELOC_386_PLT32");
222 return &elf_howto_table[R_386_PLT32];
223
224 case BFD_RELOC_386_COPY:
225 TRACE ("BFD_RELOC_386_COPY");
226 return &elf_howto_table[R_386_COPY];
227
228 case BFD_RELOC_386_GLOB_DAT:
229 TRACE ("BFD_RELOC_386_GLOB_DAT");
230 return &elf_howto_table[R_386_GLOB_DAT];
231
232 case BFD_RELOC_386_JUMP_SLOT:
233 TRACE ("BFD_RELOC_386_JUMP_SLOT");
234 return &elf_howto_table[R_386_JUMP_SLOT];
235
236 case BFD_RELOC_386_RELATIVE:
237 TRACE ("BFD_RELOC_386_RELATIVE");
238 return &elf_howto_table[R_386_RELATIVE];
239
240 case BFD_RELOC_386_GOTOFF:
241 TRACE ("BFD_RELOC_386_GOTOFF");
242 return &elf_howto_table[R_386_GOTOFF];
243
244 case BFD_RELOC_386_GOTPC:
245 TRACE ("BFD_RELOC_386_GOTPC");
246 return &elf_howto_table[R_386_GOTPC];
247
248 /* These relocs are a GNU extension. */
249 case BFD_RELOC_386_TLS_TPOFF:
250 TRACE ("BFD_RELOC_386_TLS_TPOFF");
251 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
252
253 case BFD_RELOC_386_TLS_IE:
254 TRACE ("BFD_RELOC_386_TLS_IE");
255 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
256
257 case BFD_RELOC_386_TLS_GOTIE:
258 TRACE ("BFD_RELOC_386_TLS_GOTIE");
259 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
260
261 case BFD_RELOC_386_TLS_LE:
262 TRACE ("BFD_RELOC_386_TLS_LE");
263 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
264
265 case BFD_RELOC_386_TLS_GD:
266 TRACE ("BFD_RELOC_386_TLS_GD");
267 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
268
269 case BFD_RELOC_386_TLS_LDM:
270 TRACE ("BFD_RELOC_386_TLS_LDM");
271 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
272
273 case BFD_RELOC_16:
274 TRACE ("BFD_RELOC_16");
275 return &elf_howto_table[R_386_16 - R_386_ext_offset];
276
277 case BFD_RELOC_16_PCREL:
278 TRACE ("BFD_RELOC_16_PCREL");
279 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
280
281 case BFD_RELOC_8:
282 TRACE ("BFD_RELOC_8");
283 return &elf_howto_table[R_386_8 - R_386_ext_offset];
284
285 case BFD_RELOC_8_PCREL:
286 TRACE ("BFD_RELOC_8_PCREL");
287 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
288
289 /* Common with Sun TLS implementation. */
290 case BFD_RELOC_386_TLS_LDO_32:
291 TRACE ("BFD_RELOC_386_TLS_LDO_32");
292 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
293
294 case BFD_RELOC_386_TLS_IE_32:
295 TRACE ("BFD_RELOC_386_TLS_IE_32");
296 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
297
298 case BFD_RELOC_386_TLS_LE_32:
299 TRACE ("BFD_RELOC_386_TLS_LE_32");
300 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
301
302 case BFD_RELOC_386_TLS_DTPMOD32:
303 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
304 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
305
306 case BFD_RELOC_386_TLS_DTPOFF32:
307 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
308 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
309
310 case BFD_RELOC_386_TLS_TPOFF32:
311 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
312 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
313
314 case BFD_RELOC_SIZE32:
315 TRACE ("BFD_RELOC_SIZE32");
316 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
317
318 case BFD_RELOC_386_TLS_GOTDESC:
319 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
320 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
321
322 case BFD_RELOC_386_TLS_DESC_CALL:
323 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
324 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
325
326 case BFD_RELOC_386_TLS_DESC:
327 TRACE ("BFD_RELOC_386_TLS_DESC");
328 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
329
330 case BFD_RELOC_386_IRELATIVE:
331 TRACE ("BFD_RELOC_386_IRELATIVE");
332 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
333
334 case BFD_RELOC_386_GOT32X:
335 TRACE ("BFD_RELOC_386_GOT32X");
336 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
337
338 case BFD_RELOC_VTABLE_INHERIT:
339 TRACE ("BFD_RELOC_VTABLE_INHERIT");
340 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
341
342 case BFD_RELOC_VTABLE_ENTRY:
343 TRACE ("BFD_RELOC_VTABLE_ENTRY");
344 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
345
346 default:
347 break;
348 }
349
350 TRACE ("Unknown");
351 return 0;
352}
353
354static reloc_howto_type *
355elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
356 const char *r_name)
357{
358 unsigned int i;
359
360 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
361 if (elf_howto_table[i].name != NULL
362 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
363 return &elf_howto_table[i];
364
365 return NULL;
366}
367
368static reloc_howto_type *
369elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
370{
371 unsigned int indx;
372
373 if ((indx = r_type) >= R_386_standard
374 && ((indx = r_type - R_386_ext_offset) - R_386_standard
375 >= R_386_ext - R_386_standard)
376 && ((indx = r_type - R_386_tls_offset) - R_386_ext
377 >= R_386_ext2 - R_386_ext)
378 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
379 >= R_386_vt - R_386_ext2))
380 {
381 /* xgettext:c-format */
382 _bfd_error_handler (_("%B: invalid relocation type %d"),
383 abfd, (int) r_type);
384 indx = R_386_NONE;
385 }
386 /* PR 17512: file: 0f67f69d. */
387 if (elf_howto_table [indx].type != r_type)
388 return NULL;
389 return &elf_howto_table[indx];
390}
391
392static void
393elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
394 arelent *cache_ptr,
395 Elf_Internal_Rela *dst)
396{
397 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
398 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
399}
400
401/* Return whether a symbol name implies a local label. The UnixWare
402 2.1 cc generates temporary symbols that start with .X, so we
403 recognize them here. FIXME: do other SVR4 compilers also use .X?.
404 If so, we should move the .X recognition into
405 _bfd_elf_is_local_label_name. */
406
407static bfd_boolean
408elf_i386_is_local_label_name (bfd *abfd, const char *name)
409{
410 if (name[0] == '.' && name[1] == 'X')
411 return TRUE;
412
413 return _bfd_elf_is_local_label_name (abfd, name);
414}
415\f
416/* Support for core dump NOTE sections. */
417
418static bfd_boolean
419elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
420{
421 int offset;
422 size_t size;
423
424 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
425 {
426 int pr_version = bfd_get_32 (abfd, note->descdata);
427
428 if (pr_version != 1)
429 return FALSE;
430
431 /* pr_cursig */
432 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
433
434 /* pr_pid */
435 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
436
437 /* pr_reg */
438 offset = 28;
439 size = bfd_get_32 (abfd, note->descdata + 8);
440 }
441 else
442 {
443 switch (note->descsz)
444 {
445 default:
446 return FALSE;
447
448 case 144: /* Linux/i386 */
449 /* pr_cursig */
450 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
451
452 /* pr_pid */
453 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
454
455 /* pr_reg */
456 offset = 72;
457 size = 68;
458
459 break;
460 }
461 }
462
463 /* Make a ".reg/999" section. */
464 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
465 size, note->descpos + offset);
466}
467
468static bfd_boolean
469elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
470{
471 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
472 {
473 int pr_version = bfd_get_32 (abfd, note->descdata);
474
475 if (pr_version != 1)
476 return FALSE;
477
478 elf_tdata (abfd)->core->program
479 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
480 elf_tdata (abfd)->core->command
481 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
482 }
483 else
484 {
485 switch (note->descsz)
486 {
487 default:
488 return FALSE;
489
490 case 124: /* Linux/i386 elf_prpsinfo. */
491 elf_tdata (abfd)->core->pid
492 = bfd_get_32 (abfd, note->descdata + 12);
493 elf_tdata (abfd)->core->program
494 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
495 elf_tdata (abfd)->core->command
496 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
497 }
498 }
499
500 /* Note that for some reason, a spurious space is tacked
501 onto the end of the args in some (at least one anyway)
502 implementations, so strip it off if it exists. */
503 {
504 char *command = elf_tdata (abfd)->core->command;
505 int n = strlen (command);
506
507 if (0 < n && command[n - 1] == ' ')
508 command[n - 1] = '\0';
509 }
510
511 return TRUE;
512}
513\f
514/* Functions for the i386 ELF linker.
515
516 In order to gain some understanding of code in this file without
517 knowing all the intricate details of the linker, note the
518 following:
519
520 Functions named elf_i386_* are called by external routines, other
521 functions are only called locally. elf_i386_* functions appear
522 in this file more or less in the order in which they are called
523 from external routines. eg. elf_i386_check_relocs is called
524 early in the link process, elf_i386_finish_dynamic_sections is
525 one of the last functions. */
526
527/* The size in bytes of an entry in the lazy procedure linkage table. */
528
529#define LAZY_PLT_ENTRY_SIZE 16
530
531/* The size in bytes of an entry in the non-lazy procedure linkage
532 table. */
533
534#define NON_LAZY_PLT_ENTRY_SIZE 8
535
536/* The first entry in an absolute lazy procedure linkage table looks
537 like this. See the SVR4 ABI i386 supplement to see how this works.
538 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
539
540static const bfd_byte elf_i386_lazy_plt0_entry[12] =
541{
542 0xff, 0x35, /* pushl contents of address */
543 0, 0, 0, 0, /* replaced with address of .got + 4. */
544 0xff, 0x25, /* jmp indirect */
545 0, 0, 0, 0 /* replaced with address of .got + 8. */
546};
547
548/* Subsequent entries in an absolute lazy procedure linkage table look
549 like this. */
550
551static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
552{
553 0xff, 0x25, /* jmp indirect */
554 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
555 0x68, /* pushl immediate */
556 0, 0, 0, 0, /* replaced with offset into relocation table. */
557 0xe9, /* jmp relative */
558 0, 0, 0, 0 /* replaced with offset to start of .plt. */
559};
560
561/* The first entry in a PIC lazy procedure linkage table look like
562 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
563 lazy_plt->plt0_pad_byte. */
564
565static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
566{
567 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
568 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
569};
570
571/* Subsequent entries in a PIC lazy procedure linkage table look like
572 this. */
573
574static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
575{
576 0xff, 0xa3, /* jmp *offset(%ebx) */
577 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
578 0x68, /* pushl immediate */
579 0, 0, 0, 0, /* replaced with offset into relocation table. */
580 0xe9, /* jmp relative */
581 0, 0, 0, 0 /* replaced with offset to start of .plt. */
582};
583
584/* Entries in the non-lazy procedure linkage table look like this. */
585
586static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
587{
588 0xff, 0x25, /* jmp indirect */
589 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
590 0x66, 0x90 /* xchg %ax,%ax */
591};
592
593/* Entries in the PIC non-lazy procedure linkage table look like
594 this. */
595
596static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
597{
598 0xff, 0xa3, /* jmp *offset(%ebx) */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601};
602
603/* The first entry in an absolute IBT-enabled lazy procedure linkage
604 table looks like this. */
605
606static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
607{
608 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
609 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
610 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
611};
612
613/* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
614 table look like this. Subsequent entries for a PIC IBT-enabled lazy
615 procedure linkage table are the same. */
616
617static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
618{
619 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
620 0x68, 0, 0, 0, 0, /* pushl immediate */
621 0xe9, 0, 0, 0, 0, /* jmp relative */
622 0x66, 0x90 /* xchg %ax,%ax */
623};
624
625/* The first entry in a PIC IBT-enabled lazy procedure linkage table
626 look like. */
627
628static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
629{
630 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
631 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
632 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
633};
634
635/* Entries for branches with IBT-enabled in the absolute non-lazey
636 procedure linkage table look like this. They have the same size
637 as the lazy PLT entry. */
638
639static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
640{
641 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
642 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
644};
645
646/* Entries for branches with IBT-enabled in the PIC non-lazey procedure
647 linkage table look like this. They have the same size as the lazy
648 PLT entry. */
649
650static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
651{
652 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
653 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
654 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
655};
656
657/* .eh_frame covering the lazy .plt section. */
658
659static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
660{
661 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
662 0, 0, 0, 0, /* CIE ID */
663 1, /* CIE version */
664 'z', 'R', 0, /* Augmentation string */
665 1, /* Code alignment factor */
666 0x7c, /* Data alignment factor */
667 8, /* Return address column */
668 1, /* Augmentation size */
669 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
670 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
671 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
672 DW_CFA_nop, DW_CFA_nop,
673
674 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
675 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
676 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
677 0, 0, 0, 0, /* .plt size goes here */
678 0, /* Augmentation size */
679 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
680 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
681 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
682 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
683 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
684 11, /* Block length */
685 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
686 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
687 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
688 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
689 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
690};
691
692/* .eh_frame covering the lazy .plt section with IBT-enabled. */
693
694static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
695{
696 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
697 0, 0, 0, 0, /* CIE ID */
698 1, /* CIE version */
699 'z', 'R', 0, /* Augmentation string */
700 1, /* Code alignment factor */
701 0x7c, /* Data alignment factor */
702 8, /* Return address column */
703 1, /* Augmentation size */
704 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
705 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
706 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
707 DW_CFA_nop, DW_CFA_nop,
708
709 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
710 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
711 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
712 0, 0, 0, 0, /* .plt size goes here */
713 0, /* Augmentation size */
714 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
715 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
716 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
717 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
718 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
719 11, /* Block length */
720 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
721 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
722 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
723 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
724 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
725};
726
727/* .eh_frame covering the non-lazy .plt section. */
728
729static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
730{
731#define PLT_GOT_FDE_LENGTH 16
732 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
733 0, 0, 0, 0, /* CIE ID */
734 1, /* CIE version */
735 'z', 'R', 0, /* Augmentation string */
736 1, /* Code alignment factor */
737 0x7c, /* Data alignment factor */
738 8, /* Return address column */
739 1, /* Augmentation size */
740 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
741 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
742 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
743 DW_CFA_nop, DW_CFA_nop,
744
745 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
746 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
747 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
748 0, 0, 0, 0, /* non-lazy .plt size goes here */
749 0, /* Augmentation size */
750 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
751};
752
753/* These are the standard parameters. */
754static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
755 {
756 elf_i386_lazy_plt0_entry, /* plt0_entry */
757 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
758 elf_i386_lazy_plt_entry, /* plt_entry */
759 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
760 2, /* plt0_got1_offset */
761 8, /* plt0_got2_offset */
762 0, /* plt0_got2_insn_end */
763 2, /* plt_got_offset */
764 7, /* plt_reloc_offset */
765 12, /* plt_plt_offset */
766 0, /* plt_got_insn_size */
767 0, /* plt_plt_insn_end */
768 6, /* plt_lazy_offset */
769 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
770 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
771 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
772 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
773 };
774
775static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
776 {
777 elf_i386_non_lazy_plt_entry, /* plt_entry */
778 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
779 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
780 2, /* plt_got_offset */
781 0, /* plt_got_insn_size */
782 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
783 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
784 };
785
786static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
787 {
788 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
789 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
790 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
791 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
792 2, /* plt0_got1_offset */
793 8, /* plt0_got2_offset */
794 0, /* plt0_got2_insn_end */
795 4+2, /* plt_got_offset */
796 4+1, /* plt_reloc_offset */
797 4+6, /* plt_plt_offset */
798 0, /* plt_got_insn_size */
799 0, /* plt_plt_insn_end */
800 0, /* plt_lazy_offset */
801 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
802 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
803 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
804 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
805 };
806
807static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
808 {
809 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
810 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
811 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
812 4+2, /* plt_got_offset */
813 0, /* plt_got_insn_size */
814 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
815 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
816 };
817\f
818
819/* On VxWorks, the .rel.plt.unloaded section has absolute relocations
820 for the PLTResolve stub and then for each PLT entry. */
821#define PLTRESOLVE_RELOCS_SHLIB 0
822#define PLTRESOLVE_RELOCS 2
823#define PLT_NON_JUMP_SLOT_RELOCS 2
824
825/* Architecture-specific backend data for i386. */
826
827struct elf_i386_backend_data
828{
829 /* Value used to fill the unused bytes of the first PLT entry. */
830 bfd_byte plt0_pad_byte;
831
832 /* Target system. */
833 enum
834 {
835 is_normal,
836 is_vxworks,
837 is_nacl
838 } os;
839};
840
841#define get_elf_i386_backend_data(abfd) \
842 ((const struct elf_i386_backend_data *) \
843 get_elf_backend_data (abfd)->arch_data)
844
845/* These are the standard parameters. */
846static const struct elf_i386_backend_data elf_i386_arch_bed =
847 {
848 0, /* plt0_pad_byte */
849 is_normal /* os */
850 };
851
852#define elf_backend_arch_data &elf_i386_arch_bed
853
854/* Return TRUE if the TLS access code sequence support transition
855 from R_TYPE. */
856
857static bfd_boolean
858elf_i386_check_tls_transition (asection *sec,
859 bfd_byte *contents,
860 Elf_Internal_Shdr *symtab_hdr,
861 struct elf_link_hash_entry **sym_hashes,
862 unsigned int r_type,
863 const Elf_Internal_Rela *rel,
864 const Elf_Internal_Rela *relend)
865{
866 unsigned int val, type, reg;
867 unsigned long r_symndx;
868 struct elf_link_hash_entry *h;
869 bfd_vma offset;
870 bfd_byte *call;
871 bfd_boolean indirect_call;
872
873 offset = rel->r_offset;
874 switch (r_type)
875 {
876 case R_386_TLS_GD:
877 case R_386_TLS_LDM:
878 if (offset < 2 || (rel + 1) >= relend)
879 return FALSE;
880
881 indirect_call = FALSE;
882 call = contents + offset + 4;
883 val = *(call - 5);
884 type = *(call - 6);
885 if (r_type == R_386_TLS_GD)
886 {
887 /* Check transition from GD access model. Only
888 leal foo@tlsgd(,%ebx,1), %eax
889 call ___tls_get_addr@PLT
890 or
891 leal foo@tlsgd(%ebx) %eax
892 call ___tls_get_addr@PLT
893 nop
894 or
895 leal foo@tlsgd(%reg), %eax
896 call *___tls_get_addr@GOT(%reg)
897 which may be converted to
898 addr32 call ___tls_get_addr
899 can transit to different access model. */
900 if ((offset + 10) > sec->size
901 || (type != 0x8d && type != 0x04))
902 return FALSE;
903
904 if (type == 0x04)
905 {
906 /* leal foo@tlsgd(,%ebx,1), %eax
907 call ___tls_get_addr@PLT */
908 if (offset < 3)
909 return FALSE;
910
911 if (*(call - 7) != 0x8d
912 || val != 0x1d
913 || call[0] != 0xe8)
914 return FALSE;
915 }
916 else
917 {
918 /* This must be
919 leal foo@tlsgd(%ebx), %eax
920 call ___tls_get_addr@PLT
921 nop
922 or
923 leal foo@tlsgd(%reg), %eax
924 call *___tls_get_addr@GOT(%reg)
925 which may be converted to
926 addr32 call ___tls_get_addr
927
928 %eax can't be used as the GOT base register since it
929 is used to pass parameter to ___tls_get_addr. */
930 reg = val & 7;
931 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
932 return FALSE;
933
934 indirect_call = call[0] == 0xff;
935 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
936 && !(call[0] == 0x67 && call[1] == 0xe8)
937 && !(indirect_call
938 && (call[1] & 0xf8) == 0x90
939 && (call[1] & 0x7) == reg))
940 return FALSE;
941 }
942 }
943 else
944 {
945 /* Check transition from LD access model. Only
946 leal foo@tlsldm(%ebx), %eax
947 call ___tls_get_addr@PLT
948 or
949 leal foo@tlsldm(%reg), %eax
950 call *___tls_get_addr@GOT(%reg)
951 which may be converted to
952 addr32 call ___tls_get_addr
953 can transit to different access model. */
954 if (type != 0x8d || (offset + 9) > sec->size)
955 return FALSE;
956
957 /* %eax can't be used as the GOT base register since it is
958 used to pass parameter to ___tls_get_addr. */
959 reg = val & 7;
960 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
961 return FALSE;
962
963 indirect_call = call[0] == 0xff;
964 if (!(reg == 3 && call[0] == 0xe8)
965 && !(call[0] == 0x67 && call[1] == 0xe8)
966 && !(indirect_call
967 && (call[1] & 0xf8) == 0x90
968 && (call[1] & 0x7) == reg))
969 return FALSE;
970 }
971
972 r_symndx = ELF32_R_SYM (rel[1].r_info);
973 if (r_symndx < symtab_hdr->sh_info)
974 return FALSE;
975
976 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
977 if (h == NULL
978 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
979 return FALSE;
980 else if (indirect_call)
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
982 else
983 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
984 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
985
986 case R_386_TLS_IE:
987 /* Check transition from IE access model:
988 movl foo@indntpoff(%rip), %eax
989 movl foo@indntpoff(%rip), %reg
990 addl foo@indntpoff(%rip), %reg
991 */
992
993 if (offset < 1 || (offset + 4) > sec->size)
994 return FALSE;
995
996 /* Check "movl foo@tpoff(%rip), %eax" first. */
997 val = bfd_get_8 (abfd, contents + offset - 1);
998 if (val == 0xa1)
999 return TRUE;
1000
1001 if (offset < 2)
1002 return FALSE;
1003
1004 /* Check movl|addl foo@tpoff(%rip), %reg. */
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return ((type == 0x8b || type == 0x03)
1007 && (val & 0xc7) == 0x05);
1008
1009 case R_386_TLS_GOTIE:
1010 case R_386_TLS_IE_32:
1011 /* Check transition from {IE_32,GOTIE} access model:
1012 subl foo@{tpoff,gontoff}(%reg1), %reg2
1013 movl foo@{tpoff,gontoff}(%reg1), %reg2
1014 addl foo@{tpoff,gontoff}(%reg1), %reg2
1015 */
1016
1017 if (offset < 2 || (offset + 4) > sec->size)
1018 return FALSE;
1019
1020 val = bfd_get_8 (abfd, contents + offset - 1);
1021 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1022 return FALSE;
1023
1024 type = bfd_get_8 (abfd, contents + offset - 2);
1025 return type == 0x8b || type == 0x2b || type == 0x03;
1026
1027 case R_386_TLS_GOTDESC:
1028 /* Check transition from GDesc access model:
1029 leal x@tlsdesc(%ebx), %eax
1030
1031 Make sure it's a leal adding ebx to a 32-bit offset
1032 into any register, although it's probably almost always
1033 going to be eax. */
1034
1035 if (offset < 2 || (offset + 4) > sec->size)
1036 return FALSE;
1037
1038 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1039 return FALSE;
1040
1041 val = bfd_get_8 (abfd, contents + offset - 1);
1042 return (val & 0xc7) == 0x83;
1043
1044 case R_386_TLS_DESC_CALL:
1045 /* Check transition from GDesc access model:
1046 call *x@tlsdesc(%eax)
1047 */
1048 if (offset + 2 <= sec->size)
1049 {
1050 /* Make sure that it's a call *x@tlsdesc(%eax). */
1051 call = contents + offset;
1052 return call[0] == 0xff && call[1] == 0x10;
1053 }
1054
1055 return FALSE;
1056
1057 default:
1058 abort ();
1059 }
1060}
1061
1062/* Return TRUE if the TLS access transition is OK or no transition
1063 will be performed. Update R_TYPE if there is a transition. */
1064
1065static bfd_boolean
1066elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1067 asection *sec, bfd_byte *contents,
1068 Elf_Internal_Shdr *symtab_hdr,
1069 struct elf_link_hash_entry **sym_hashes,
1070 unsigned int *r_type, int tls_type,
1071 const Elf_Internal_Rela *rel,
1072 const Elf_Internal_Rela *relend,
1073 struct elf_link_hash_entry *h,
1074 unsigned long r_symndx,
1075 bfd_boolean from_relocate_section)
1076{
1077 unsigned int from_type = *r_type;
1078 unsigned int to_type = from_type;
1079 bfd_boolean check = TRUE;
1080
1081 /* Skip TLS transition for functions. */
1082 if (h != NULL
1083 && (h->type == STT_FUNC
1084 || h->type == STT_GNU_IFUNC))
1085 return TRUE;
1086
1087 switch (from_type)
1088 {
1089 case R_386_TLS_GD:
1090 case R_386_TLS_GOTDESC:
1091 case R_386_TLS_DESC_CALL:
1092 case R_386_TLS_IE_32:
1093 case R_386_TLS_IE:
1094 case R_386_TLS_GOTIE:
1095 if (bfd_link_executable (info))
1096 {
1097 if (h == NULL)
1098 to_type = R_386_TLS_LE_32;
1099 else if (from_type != R_386_TLS_IE
1100 && from_type != R_386_TLS_GOTIE)
1101 to_type = R_386_TLS_IE_32;
1102 }
1103
1104 /* When we are called from elf_i386_relocate_section, there may
1105 be additional transitions based on TLS_TYPE. */
1106 if (from_relocate_section)
1107 {
1108 unsigned int new_to_type = to_type;
1109
1110 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1111 new_to_type = R_386_TLS_LE_32;
1112
1113 if (to_type == R_386_TLS_GD
1114 || to_type == R_386_TLS_GOTDESC
1115 || to_type == R_386_TLS_DESC_CALL)
1116 {
1117 if (tls_type == GOT_TLS_IE_POS)
1118 new_to_type = R_386_TLS_GOTIE;
1119 else if (tls_type & GOT_TLS_IE)
1120 new_to_type = R_386_TLS_IE_32;
1121 }
1122
1123 /* We checked the transition before when we were called from
1124 elf_i386_check_relocs. We only want to check the new
1125 transition which hasn't been checked before. */
1126 check = new_to_type != to_type && from_type == to_type;
1127 to_type = new_to_type;
1128 }
1129
1130 break;
1131
1132 case R_386_TLS_LDM:
1133 if (bfd_link_executable (info))
1134 to_type = R_386_TLS_LE_32;
1135 break;
1136
1137 default:
1138 return TRUE;
1139 }
1140
1141 /* Return TRUE if there is no transition. */
1142 if (from_type == to_type)
1143 return TRUE;
1144
1145 /* Check if the transition can be performed. */
1146 if (check
1147 && ! elf_i386_check_tls_transition (sec, contents,
1148 symtab_hdr, sym_hashes,
1149 from_type, rel, relend))
1150 {
1151 reloc_howto_type *from, *to;
1152 const char *name;
1153
1154 from = elf_i386_rtype_to_howto (abfd, from_type);
1155 to = elf_i386_rtype_to_howto (abfd, to_type);
1156
1157 if (h)
1158 name = h->root.root.string;
1159 else
1160 {
1161 struct elf_x86_link_hash_table *htab;
1162
1163 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1164 if (htab == NULL)
1165 name = "*unknown*";
1166 else
1167 {
1168 Elf_Internal_Sym *isym;
1169
1170 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1171 abfd, r_symndx);
1172 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1173 }
1174 }
1175
1176 _bfd_error_handler
1177 /* xgettext:c-format */
1178 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1179 "in section `%A' failed"),
1180 abfd, from->name, to->name, name,
1181 rel->r_offset, sec);
1182 bfd_set_error (bfd_error_bad_value);
1183 return FALSE;
1184 }
1185
1186 *r_type = to_type;
1187 return TRUE;
1188}
1189
1190/* With the local symbol, foo, we convert
1191 mov foo@GOT[(%reg1)], %reg2
1192 to
1193 lea foo[@GOTOFF(%reg1)], %reg2
1194 and convert
1195 call/jmp *foo@GOT[(%reg)]
1196 to
1197 nop call foo/jmp foo nop
1198 When PIC is false, convert
1199 test %reg1, foo@GOT[(%reg2)]
1200 to
1201 test $foo, %reg1
1202 and convert
1203 binop foo@GOT[(%reg1)], %reg2
1204 to
1205 binop $foo, %reg2
1206 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1207 instructions. */
1208
1209static
1210bfd_boolean
1211elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1212 bfd_byte *contents,
1213 unsigned int *r_type_p,
1214 Elf_Internal_Rela *irel,
1215 struct elf_link_hash_entry *h,
1216 bfd_boolean *converted,
1217 struct bfd_link_info *link_info)
1218{
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1221 unsigned int modrm;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1225 unsigned int nop;
1226 bfd_vma nop_offset;
1227 bfd_boolean is_pic;
1228 bfd_boolean to_reloc_32;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 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. */
1330convert_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 *converted = TRUE;
1373 }
1374 }
1375 else
1376 {
1377 /* We have "mov foo@GOT[(%re1g)], %reg2",
1378 "test %reg1, foo@GOT(%reg2)" and
1379 "binop foo@GOT[(%reg1)], %reg2".
1380
1381 Avoid optimizing _DYNAMIC since ld.so may use its
1382 link-time address. */
1383 if (h == htab->elf.hdynamic)
1384 return TRUE;
1385
1386 /* def_regular is set by an assignment in a linker script in
1387 bfd_elf_record_link_assignment. start_stop is set on
1388 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1389 if (h->start_stop
1390 || eh->linker_def
1391 || ((h->def_regular
1392 || h->root.type == bfd_link_hash_defined
1393 || h->root.type == bfd_link_hash_defweak)
1394 && local_ref))
1395 {
1396convert_load:
1397 if (opcode == 0x8b)
1398 {
1399 if (to_reloc_32)
1400 {
1401 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1402 "mov $foo, %reg2" with R_386_32. */
1403 r_type = R_386_32;
1404 modrm = 0xc0 | (modrm & 0x38) >> 3;
1405 bfd_put_8 (abfd, modrm, contents + roff - 1);
1406 opcode = 0xc7;
1407 }
1408 else
1409 {
1410 /* Convert "mov foo@GOT(%reg1), %reg2" to
1411 "lea foo@GOTOFF(%reg1), %reg2". */
1412 r_type = R_386_GOTOFF;
1413 opcode = 0x8d;
1414 }
1415 }
1416 else
1417 {
1418 /* Only R_386_32 is supported. */
1419 if (!to_reloc_32)
1420 return TRUE;
1421
1422 if (opcode == 0x85)
1423 {
1424 /* Convert "test %reg1, foo@GOT(%reg2)" to
1425 "test $foo, %reg1". */
1426 modrm = 0xc0 | (modrm & 0x38) >> 3;
1427 opcode = 0xf7;
1428 }
1429 else
1430 {
1431 /* Convert "binop foo@GOT(%reg1), %reg2" to
1432 "binop $foo, %reg2". */
1433 modrm = (0xc0
1434 | (modrm & 0x38) >> 3
1435 | (opcode & 0x3c));
1436 opcode = 0x81;
1437 }
1438 bfd_put_8 (abfd, modrm, contents + roff - 1);
1439 r_type = R_386_32;
1440 }
1441
1442 bfd_put_8 (abfd, opcode, contents + roff - 2);
1443 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1444 *r_type_p = r_type;
1445 *converted = TRUE;
1446 }
1447 }
1448
1449 return TRUE;
1450}
1451
1452/* Rename some of the generic section flags to better document how they
1453 are used here. */
1454#define check_relocs_failed sec_flg0
1455
1456/* Look through the relocs for a section during the first phase, and
1457 calculate needed space in the global offset table, procedure linkage
1458 table, and dynamic reloc sections. */
1459
1460static bfd_boolean
1461elf_i386_check_relocs (bfd *abfd,
1462 struct bfd_link_info *info,
1463 asection *sec,
1464 const Elf_Internal_Rela *relocs)
1465{
1466 struct elf_x86_link_hash_table *htab;
1467 Elf_Internal_Shdr *symtab_hdr;
1468 struct elf_link_hash_entry **sym_hashes;
1469 const Elf_Internal_Rela *rel;
1470 const Elf_Internal_Rela *rel_end;
1471 asection *sreloc;
1472 bfd_byte *contents;
1473 bfd_boolean converted;
1474
1475 if (bfd_link_relocatable (info))
1476 return TRUE;
1477
1478 /* Don't do anything special with non-loaded, non-alloced sections.
1479 In particular, any relocs in such sections should not affect GOT
1480 and PLT reference counting (ie. we don't allow them to create GOT
1481 or PLT entries), there's no possibility or desire to optimize TLS
1482 relocs, and there's not much point in propagating relocs to shared
1483 libs that the dynamic linker won't relocate. */
1484 if ((sec->flags & SEC_ALLOC) == 0)
1485 return TRUE;
1486
1487 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1488 if (htab == NULL)
1489 {
1490 sec->check_relocs_failed = 1;
1491 return FALSE;
1492 }
1493
1494 BFD_ASSERT (is_x86_elf (abfd, htab));
1495
1496 /* Get the section contents. */
1497 if (elf_section_data (sec)->this_hdr.contents != NULL)
1498 contents = elf_section_data (sec)->this_hdr.contents;
1499 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1500 {
1501 sec->check_relocs_failed = 1;
1502 return FALSE;
1503 }
1504
1505 symtab_hdr = &elf_symtab_hdr (abfd);
1506 sym_hashes = elf_sym_hashes (abfd);
1507
1508 converted = FALSE;
1509
1510 sreloc = NULL;
1511
1512 rel_end = relocs + sec->reloc_count;
1513 for (rel = relocs; rel < rel_end; rel++)
1514 {
1515 unsigned int r_type;
1516 unsigned int r_symndx;
1517 struct elf_link_hash_entry *h;
1518 struct elf_x86_link_hash_entry *eh;
1519 Elf_Internal_Sym *isym;
1520 const char *name;
1521 bfd_boolean size_reloc;
1522
1523 r_symndx = ELF32_R_SYM (rel->r_info);
1524 r_type = ELF32_R_TYPE (rel->r_info);
1525
1526 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1527 {
1528 /* xgettext:c-format */
1529 _bfd_error_handler (_("%B: bad symbol index: %d"),
1530 abfd, r_symndx);
1531 goto error_return;
1532 }
1533
1534 if (r_symndx < symtab_hdr->sh_info)
1535 {
1536 /* A local symbol. */
1537 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1538 abfd, r_symndx);
1539 if (isym == NULL)
1540 goto error_return;
1541
1542 /* Check relocation against local STT_GNU_IFUNC symbol. */
1543 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1544 {
1545 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1546 if (h == NULL)
1547 goto error_return;
1548
1549 /* Fake a STT_GNU_IFUNC symbol. */
1550 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1551 isym, NULL);
1552 h->type = STT_GNU_IFUNC;
1553 h->def_regular = 1;
1554 h->ref_regular = 1;
1555 h->forced_local = 1;
1556 h->root.type = bfd_link_hash_defined;
1557 }
1558 else
1559 h = NULL;
1560 }
1561 else
1562 {
1563 isym = NULL;
1564 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1565 while (h->root.type == bfd_link_hash_indirect
1566 || h->root.type == bfd_link_hash_warning)
1567 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1568 }
1569
1570 eh = (struct elf_x86_link_hash_entry *) h;
1571 if (h != NULL)
1572 {
1573 if (r_type == R_386_GOTOFF)
1574 eh->gotoff_ref = 1;
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 h->root.non_ir_ref_regular = 1;
1579
1580 if (h->type == STT_GNU_IFUNC)
1581 elf_tdata (info->output_bfd)->has_gnu_symbols
1582 |= elf_gnu_symbol_ifunc;
1583 }
1584
1585 if (r_type == R_386_GOT32X
1586 && (h == NULL || h->type != STT_GNU_IFUNC))
1587 {
1588 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1589 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1590 &r_type, irel, h,
1591 &converted, info))
1592 goto error_return;
1593 }
1594
1595 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1596 symtab_hdr, sym_hashes,
1597 &r_type, GOT_UNKNOWN,
1598 rel, rel_end, h, r_symndx, FALSE))
1599 goto error_return;
1600
1601 switch (r_type)
1602 {
1603 case R_386_TLS_LDM:
1604 htab->tls_ld_or_ldm_got.refcount += 1;
1605 goto create_got;
1606
1607 case R_386_PLT32:
1608 /* This symbol requires a procedure linkage table entry. We
1609 actually build the entry in adjust_dynamic_symbol,
1610 because this might be a case of linking PIC code which is
1611 never referenced by a dynamic object, in which case we
1612 don't need to generate a procedure linkage table entry
1613 after all. */
1614
1615 /* If this is a local symbol, we resolve it directly without
1616 creating a procedure linkage table entry. */
1617 if (h == NULL)
1618 continue;
1619
1620 eh->has_got_reloc = 1;
1621 h->needs_plt = 1;
1622 h->plt.refcount += 1;
1623 break;
1624
1625 case R_386_SIZE32:
1626 size_reloc = TRUE;
1627 goto do_size;
1628
1629 case R_386_TLS_IE_32:
1630 case R_386_TLS_IE:
1631 case R_386_TLS_GOTIE:
1632 if (!bfd_link_executable (info))
1633 info->flags |= DF_STATIC_TLS;
1634 /* Fall through */
1635
1636 case R_386_GOT32:
1637 case R_386_GOT32X:
1638 case R_386_TLS_GD:
1639 case R_386_TLS_GOTDESC:
1640 case R_386_TLS_DESC_CALL:
1641 /* This symbol requires a global offset table entry. */
1642 {
1643 int tls_type, old_tls_type;
1644
1645 switch (r_type)
1646 {
1647 default:
1648 case R_386_GOT32:
1649 case R_386_GOT32X:
1650 tls_type = GOT_NORMAL;
1651 break;
1652 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1653 case R_386_TLS_GOTDESC:
1654 case R_386_TLS_DESC_CALL:
1655 tls_type = GOT_TLS_GDESC; break;
1656 case R_386_TLS_IE_32:
1657 if (ELF32_R_TYPE (rel->r_info) == r_type)
1658 tls_type = GOT_TLS_IE_NEG;
1659 else
1660 /* If this is a GD->IE transition, we may use either of
1661 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1662 tls_type = GOT_TLS_IE;
1663 break;
1664 case R_386_TLS_IE:
1665 case R_386_TLS_GOTIE:
1666 tls_type = GOT_TLS_IE_POS; break;
1667 }
1668
1669 if (h != NULL)
1670 {
1671 h->got.refcount += 1;
1672 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1673 }
1674 else
1675 {
1676 bfd_signed_vma *local_got_refcounts;
1677
1678 /* This is a global offset table entry for a local symbol. */
1679 local_got_refcounts = elf_local_got_refcounts (abfd);
1680 if (local_got_refcounts == NULL)
1681 {
1682 bfd_size_type size;
1683
1684 size = symtab_hdr->sh_info;
1685 size *= (sizeof (bfd_signed_vma)
1686 + sizeof (bfd_vma) + sizeof(char));
1687 local_got_refcounts = (bfd_signed_vma *)
1688 bfd_zalloc (abfd, size);
1689 if (local_got_refcounts == NULL)
1690 goto error_return;
1691 elf_local_got_refcounts (abfd) = local_got_refcounts;
1692 elf_x86_local_tlsdesc_gotent (abfd)
1693 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1694 elf_x86_local_got_tls_type (abfd)
1695 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1696 }
1697 local_got_refcounts[r_symndx] += 1;
1698 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1699 }
1700
1701 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1702 tls_type |= old_tls_type;
1703 /* If a TLS symbol is accessed using IE at least once,
1704 there is no point to use dynamic model for it. */
1705 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1706 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1707 || (tls_type & GOT_TLS_IE) == 0))
1708 {
1709 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1710 tls_type = old_tls_type;
1711 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1712 && GOT_TLS_GD_ANY_P (tls_type))
1713 tls_type |= old_tls_type;
1714 else
1715 {
1716 if (h)
1717 name = h->root.root.string;
1718 else
1719 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1720 NULL);
1721 _bfd_error_handler
1722 /* xgettext:c-format */
1723 (_("%B: `%s' accessed both as normal and "
1724 "thread local symbol"),
1725 abfd, name);
1726 bfd_set_error (bfd_error_bad_value);
1727 goto error_return;
1728 }
1729 }
1730
1731 if (old_tls_type != tls_type)
1732 {
1733 if (h != NULL)
1734 elf_x86_hash_entry (h)->tls_type = tls_type;
1735 else
1736 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1737 }
1738 }
1739 /* Fall through */
1740
1741 case R_386_GOTOFF:
1742 case R_386_GOTPC:
1743 create_got:
1744 if (r_type != R_386_TLS_IE)
1745 {
1746 if (eh != NULL)
1747 eh->has_got_reloc = 1;
1748 break;
1749 }
1750 /* Fall through */
1751
1752 case R_386_TLS_LE_32:
1753 case R_386_TLS_LE:
1754 if (eh != NULL)
1755 eh->has_got_reloc = 1;
1756 if (bfd_link_executable (info))
1757 break;
1758 info->flags |= DF_STATIC_TLS;
1759 goto do_relocation;
1760
1761 case R_386_32:
1762 case R_386_PC32:
1763 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1764 eh->has_non_got_reloc = 1;
1765do_relocation:
1766 /* We are called after all symbols have been resolved. Only
1767 relocation against STT_GNU_IFUNC symbol must go through
1768 PLT. */
1769 if (h != NULL
1770 && (bfd_link_executable (info)
1771 || h->type == STT_GNU_IFUNC))
1772 {
1773 /* If this reloc is in a read-only section, we might
1774 need a copy reloc. We can't check reliably at this
1775 stage whether the section is read-only, as input
1776 sections have not yet been mapped to output sections.
1777 Tentatively set the flag for now, and correct in
1778 adjust_dynamic_symbol. */
1779 h->non_got_ref = 1;
1780
1781 /* We may need a .plt entry if the symbol is a function
1782 defined in a shared lib or is a STT_GNU_IFUNC function
1783 referenced from the code or read-only section. */
1784 if (!h->def_regular
1785 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1786 h->plt.refcount += 1;
1787
1788 if (r_type == R_386_PC32)
1789 {
1790 /* Since something like ".long foo - ." may be used
1791 as pointer, make sure that PLT is used if foo is
1792 a function defined in a shared library. */
1793 if ((sec->flags & SEC_CODE) == 0)
1794 h->pointer_equality_needed = 1;
1795 else if (h->type == STT_GNU_IFUNC
1796 && bfd_link_pic (info))
1797 {
1798 _bfd_error_handler
1799 /* xgettext:c-format */
1800 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1801 abfd, h->root.root.string);
1802 bfd_set_error (bfd_error_bad_value);
1803 goto error_return;
1804 }
1805 }
1806 else
1807 {
1808 h->pointer_equality_needed = 1;
1809 /* R_386_32 can be resolved at run-time. */
1810 if (r_type == R_386_32
1811 && (sec->flags & SEC_READONLY) == 0)
1812 eh->func_pointer_refcount += 1;
1813 }
1814 }
1815
1816 size_reloc = FALSE;
1817do_size:
1818 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
1819 R_386_32))
1820 {
1821 struct elf_dyn_relocs *p;
1822 struct elf_dyn_relocs **head;
1823
1824 /* We must copy these reloc types into the output file.
1825 Create a reloc section in dynobj and make room for
1826 this reloc. */
1827 if (sreloc == NULL)
1828 {
1829 sreloc = _bfd_elf_make_dynamic_reloc_section
1830 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1831
1832 if (sreloc == NULL)
1833 goto error_return;
1834 }
1835
1836 /* If this is a global symbol, we count the number of
1837 relocations we need for this symbol. */
1838 if (h != NULL)
1839 {
1840 head = &eh->dyn_relocs;
1841 }
1842 else
1843 {
1844 /* Track dynamic relocs needed for local syms too.
1845 We really need local syms available to do this
1846 easily. Oh well. */
1847 void **vpp;
1848 asection *s;
1849
1850 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1851 abfd, r_symndx);
1852 if (isym == NULL)
1853 goto error_return;
1854
1855 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1856 if (s == NULL)
1857 s = sec;
1858
1859 vpp = &elf_section_data (s)->local_dynrel;
1860 head = (struct elf_dyn_relocs **)vpp;
1861 }
1862
1863 p = *head;
1864 if (p == NULL || p->sec != sec)
1865 {
1866 bfd_size_type amt = sizeof *p;
1867 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1868 amt);
1869 if (p == NULL)
1870 goto error_return;
1871 p->next = *head;
1872 *head = p;
1873 p->sec = sec;
1874 p->count = 0;
1875 p->pc_count = 0;
1876 }
1877
1878 p->count += 1;
1879 /* Count size relocation as PC-relative relocation. */
1880 if (r_type == R_386_PC32 || size_reloc)
1881 p->pc_count += 1;
1882 }
1883 break;
1884
1885 /* This relocation describes the C++ object vtable hierarchy.
1886 Reconstruct it for later use during GC. */
1887 case R_386_GNU_VTINHERIT:
1888 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1889 goto error_return;
1890 break;
1891
1892 /* This relocation describes which C++ vtable entries are actually
1893 used. Record for later use during GC. */
1894 case R_386_GNU_VTENTRY:
1895 BFD_ASSERT (h != NULL);
1896 if (h != NULL
1897 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1898 goto error_return;
1899 break;
1900
1901 default:
1902 break;
1903 }
1904 }
1905
1906 if (elf_section_data (sec)->this_hdr.contents != contents)
1907 {
1908 if (!converted && !info->keep_memory)
1909 free (contents);
1910 else
1911 {
1912 /* Cache the section contents for elf_link_input_bfd if any
1913 load is converted or --no-keep-memory isn't used. */
1914 elf_section_data (sec)->this_hdr.contents = contents;
1915 }
1916 }
1917
1918 /* Cache relocations if any load is converted. */
1919 if (elf_section_data (sec)->relocs != relocs && converted)
1920 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1921
1922 return TRUE;
1923
1924error_return:
1925 if (elf_section_data (sec)->this_hdr.contents != contents)
1926 free (contents);
1927 sec->check_relocs_failed = 1;
1928 return FALSE;
1929}
1930
1931/* Set the correct type for an x86 ELF section. We do this by the
1932 section name, which is a hack, but ought to work. */
1933
1934static bfd_boolean
1935elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1936 Elf_Internal_Shdr *hdr,
1937 asection *sec)
1938{
1939 const char *name;
1940
1941 name = bfd_get_section_name (abfd, sec);
1942
1943 /* This is an ugly, but unfortunately necessary hack that is
1944 needed when producing EFI binaries on x86. It tells
1945 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1946 containing ELF relocation info. We need this hack in order to
1947 be able to generate ELF binaries that can be translated into
1948 EFI applications (which are essentially COFF objects). Those
1949 files contain a COFF ".reloc" section inside an ELFNN object,
1950 which would normally cause BFD to segfault because it would
1951 attempt to interpret this section as containing relocation
1952 entries for section "oc". With this hack enabled, ".reloc"
1953 will be treated as a normal data section, which will avoid the
1954 segfault. However, you won't be able to create an ELFNN binary
1955 with a section named "oc" that needs relocations, but that's
1956 the kind of ugly side-effects you get when detecting section
1957 types based on their names... In practice, this limitation is
1958 unlikely to bite. */
1959 if (strcmp (name, ".reloc") == 0)
1960 hdr->sh_type = SHT_PROGBITS;
1961
1962 return TRUE;
1963}
1964
1965/* Return the relocation value for @tpoff relocation
1966 if STT_TLS virtual address is ADDRESS. */
1967
1968static bfd_vma
1969elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1970{
1971 struct elf_link_hash_table *htab = elf_hash_table (info);
1972 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1973 bfd_vma static_tls_size;
1974
1975 /* If tls_sec is NULL, we should have signalled an error already. */
1976 if (htab->tls_sec == NULL)
1977 return 0;
1978
1979 /* Consider special static TLS alignment requirements. */
1980 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1981 return static_tls_size + htab->tls_sec->vma - address;
1982}
1983
1984/* Relocate an i386 ELF section. */
1985
1986static bfd_boolean
1987elf_i386_relocate_section (bfd *output_bfd,
1988 struct bfd_link_info *info,
1989 bfd *input_bfd,
1990 asection *input_section,
1991 bfd_byte *contents,
1992 Elf_Internal_Rela *relocs,
1993 Elf_Internal_Sym *local_syms,
1994 asection **local_sections)
1995{
1996 struct elf_x86_link_hash_table *htab;
1997 Elf_Internal_Shdr *symtab_hdr;
1998 struct elf_link_hash_entry **sym_hashes;
1999 bfd_vma *local_got_offsets;
2000 bfd_vma *local_tlsdesc_gotents;
2001 Elf_Internal_Rela *rel;
2002 Elf_Internal_Rela *wrel;
2003 Elf_Internal_Rela *relend;
2004 bfd_boolean is_vxworks_tls;
2005 unsigned plt_entry_size;
2006
2007 /* Skip if check_relocs failed. */
2008 if (input_section->check_relocs_failed)
2009 return FALSE;
2010
2011 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2012 if (htab == NULL)
2013 return FALSE;
2014
2015 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2016
2017 symtab_hdr = &elf_symtab_hdr (input_bfd);
2018 sym_hashes = elf_sym_hashes (input_bfd);
2019 local_got_offsets = elf_local_got_offsets (input_bfd);
2020 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2021 /* We have to handle relocations in vxworks .tls_vars sections
2022 specially, because the dynamic loader is 'weird'. */
2023 is_vxworks_tls = (htab->is_vxworks
2024 && bfd_link_pic (info)
2025 && !strcmp (input_section->output_section->name,
2026 ".tls_vars"));
2027
2028 _bfd_x86_elf_set_tls_module_base (info);
2029
2030 plt_entry_size = htab->plt.plt_entry_size;
2031
2032 rel = wrel = relocs;
2033 relend = relocs + input_section->reloc_count;
2034 for (; rel < relend; wrel++, rel++)
2035 {
2036 unsigned int r_type, r_type_tls;
2037 reloc_howto_type *howto;
2038 unsigned long r_symndx;
2039 struct elf_link_hash_entry *h;
2040 struct elf_x86_link_hash_entry *eh;
2041 Elf_Internal_Sym *sym;
2042 asection *sec;
2043 bfd_vma off, offplt, plt_offset;
2044 bfd_vma relocation;
2045 bfd_boolean unresolved_reloc;
2046 bfd_reloc_status_type r;
2047 unsigned int indx;
2048 int tls_type;
2049 bfd_vma st_size;
2050 asection *resolved_plt;
2051 bfd_boolean resolved_to_zero;
2052 bfd_boolean relative_reloc;
2053
2054 r_type = ELF32_R_TYPE (rel->r_info);
2055 if (r_type == R_386_GNU_VTINHERIT
2056 || r_type == R_386_GNU_VTENTRY)
2057 {
2058 if (wrel != rel)
2059 *wrel = *rel;
2060 continue;
2061 }
2062
2063 if ((indx = r_type) >= R_386_standard
2064 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2065 >= R_386_ext - R_386_standard)
2066 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2067 >= R_386_ext2 - R_386_ext))
2068 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2069
2070 howto = elf_howto_table + indx;
2071
2072 r_symndx = ELF32_R_SYM (rel->r_info);
2073 h = NULL;
2074 sym = NULL;
2075 sec = NULL;
2076 unresolved_reloc = FALSE;
2077 if (r_symndx < symtab_hdr->sh_info)
2078 {
2079 sym = local_syms + r_symndx;
2080 sec = local_sections[r_symndx];
2081 relocation = (sec->output_section->vma
2082 + sec->output_offset
2083 + sym->st_value);
2084 st_size = sym->st_size;
2085
2086 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2087 && ((sec->flags & SEC_MERGE) != 0
2088 || (bfd_link_relocatable (info)
2089 && sec->output_offset != 0)))
2090 {
2091 bfd_vma addend;
2092 bfd_byte *where = contents + rel->r_offset;
2093
2094 switch (howto->size)
2095 {
2096 case 0:
2097 addend = bfd_get_8 (input_bfd, where);
2098 if (howto->pc_relative)
2099 {
2100 addend = (addend ^ 0x80) - 0x80;
2101 addend += 1;
2102 }
2103 break;
2104 case 1:
2105 addend = bfd_get_16 (input_bfd, where);
2106 if (howto->pc_relative)
2107 {
2108 addend = (addend ^ 0x8000) - 0x8000;
2109 addend += 2;
2110 }
2111 break;
2112 case 2:
2113 addend = bfd_get_32 (input_bfd, where);
2114 if (howto->pc_relative)
2115 {
2116 addend = (addend ^ 0x80000000) - 0x80000000;
2117 addend += 4;
2118 }
2119 break;
2120 default:
2121 abort ();
2122 }
2123
2124 if (bfd_link_relocatable (info))
2125 addend += sec->output_offset;
2126 else
2127 {
2128 asection *msec = sec;
2129 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2130 addend);
2131 addend -= relocation;
2132 addend += msec->output_section->vma + msec->output_offset;
2133 }
2134
2135 switch (howto->size)
2136 {
2137 case 0:
2138 /* FIXME: overflow checks. */
2139 if (howto->pc_relative)
2140 addend -= 1;
2141 bfd_put_8 (input_bfd, addend, where);
2142 break;
2143 case 1:
2144 if (howto->pc_relative)
2145 addend -= 2;
2146 bfd_put_16 (input_bfd, addend, where);
2147 break;
2148 case 2:
2149 if (howto->pc_relative)
2150 addend -= 4;
2151 bfd_put_32 (input_bfd, addend, where);
2152 break;
2153 }
2154 }
2155 else if (!bfd_link_relocatable (info)
2156 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2157 {
2158 /* Relocate against local STT_GNU_IFUNC symbol. */
2159 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2160 FALSE);
2161 if (h == NULL)
2162 abort ();
2163
2164 /* Set STT_GNU_IFUNC symbol value. */
2165 h->root.u.def.value = sym->st_value;
2166 h->root.u.def.section = sec;
2167 }
2168 }
2169 else
2170 {
2171 bfd_boolean warned ATTRIBUTE_UNUSED;
2172 bfd_boolean ignored ATTRIBUTE_UNUSED;
2173
2174 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2175 r_symndx, symtab_hdr, sym_hashes,
2176 h, sec, relocation,
2177 unresolved_reloc, warned, ignored);
2178 st_size = h->size;
2179 }
2180
2181 if (sec != NULL && discarded_section (sec))
2182 {
2183 _bfd_clear_contents (howto, input_bfd, input_section,
2184 contents + rel->r_offset);
2185 wrel->r_offset = rel->r_offset;
2186 wrel->r_info = 0;
2187 wrel->r_addend = 0;
2188
2189 /* For ld -r, remove relocations in debug sections against
2190 sections defined in discarded sections. Not done for
2191 eh_frame editing code expects to be present. */
2192 if (bfd_link_relocatable (info)
2193 && (input_section->flags & SEC_DEBUGGING))
2194 wrel--;
2195
2196 continue;
2197 }
2198
2199 if (bfd_link_relocatable (info))
2200 {
2201 if (wrel != rel)
2202 *wrel = *rel;
2203 continue;
2204 }
2205
2206 eh = (struct elf_x86_link_hash_entry *) h;
2207
2208 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2209 it here if it is defined in a non-shared object. */
2210 if (h != NULL
2211 && h->type == STT_GNU_IFUNC
2212 && h->def_regular)
2213 {
2214 asection *gotplt, *base_got;
2215 bfd_vma plt_index;
2216 const char *name;
2217
2218 if ((input_section->flags & SEC_ALLOC) == 0)
2219 {
2220 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2221 sections because such sections are not SEC_ALLOC and
2222 thus ld.so will not process them. */
2223 if ((input_section->flags & SEC_DEBUGGING) != 0)
2224 continue;
2225 abort ();
2226 }
2227
2228 /* STT_GNU_IFUNC symbol must go through PLT. */
2229 if (htab->elf.splt != NULL)
2230 {
2231 if (htab->plt_second != NULL)
2232 {
2233 resolved_plt = htab->plt_second;
2234 plt_offset = eh->plt_second.offset;
2235 }
2236 else
2237 {
2238 resolved_plt = htab->elf.splt;
2239 plt_offset = h->plt.offset;
2240 }
2241 gotplt = htab->elf.sgotplt;
2242 }
2243 else
2244 {
2245 resolved_plt = htab->elf.iplt;
2246 plt_offset = h->plt.offset;
2247 gotplt = htab->elf.igotplt;
2248 }
2249
2250 switch (r_type)
2251 {
2252 default:
2253 break;
2254
2255 case R_386_GOT32:
2256 case R_386_GOT32X:
2257 base_got = htab->elf.sgot;
2258 off = h->got.offset;
2259
2260 if (base_got == NULL)
2261 abort ();
2262
2263 if (off == (bfd_vma) -1)
2264 {
2265 /* We can't use h->got.offset here to save state, or
2266 even just remember the offset, as finish_dynamic_symbol
2267 would use that as offset into .got. */
2268
2269 if (h->plt.offset == (bfd_vma) -1)
2270 abort ();
2271
2272 if (htab->elf.splt != NULL)
2273 {
2274 plt_index = (h->plt.offset / plt_entry_size
2275 - htab->plt.has_plt0);
2276 off = (plt_index + 3) * 4;
2277 base_got = htab->elf.sgotplt;
2278 }
2279 else
2280 {
2281 plt_index = h->plt.offset / plt_entry_size;
2282 off = plt_index * 4;
2283 base_got = htab->elf.igotplt;
2284 }
2285
2286 if (h->dynindx == -1
2287 || h->forced_local
2288 || info->symbolic)
2289 {
2290 /* This references the local defitionion. We must
2291 initialize this entry in the global offset table.
2292 Since the offset must always be a multiple of 8,
2293 we use the least significant bit to record
2294 whether we have initialized it already.
2295
2296 When doing a dynamic link, we create a .rela.got
2297 relocation entry to initialize the value. This
2298 is done in the finish_dynamic_symbol routine. */
2299 if ((off & 1) != 0)
2300 off &= ~1;
2301 else
2302 {
2303 bfd_put_32 (output_bfd, relocation,
2304 base_got->contents + off);
2305 h->got.offset |= 1;
2306 }
2307 }
2308
2309 relocation = off;
2310 }
2311 else
2312 relocation = (base_got->output_section->vma
2313 + base_got->output_offset + off
2314 - gotplt->output_section->vma
2315 - gotplt->output_offset);
2316
2317 if (rel->r_offset > 1
2318 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2319 && *(contents + rel->r_offset - 2) != 0x8d)
2320 {
2321 if (bfd_link_pic (info))
2322 goto disallow_got32;
2323
2324 /* Add the GOT base if there is no base register. */
2325 relocation += (gotplt->output_section->vma
2326 + gotplt->output_offset);
2327 }
2328 else if (htab->elf.splt == NULL)
2329 {
2330 /* Adjust for static executables. */
2331 relocation += gotplt->output_offset;
2332 }
2333
2334 goto do_relocation;
2335 }
2336
2337 if (h->plt.offset == (bfd_vma) -1)
2338 {
2339 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2340 if (r_type == R_386_32
2341 && (input_section->flags & SEC_CODE) == 0)
2342 goto do_ifunc_pointer;
2343 goto bad_ifunc_reloc;
2344 }
2345
2346 relocation = (resolved_plt->output_section->vma
2347 + resolved_plt->output_offset + plt_offset);
2348
2349 switch (r_type)
2350 {
2351 default:
2352bad_ifunc_reloc:
2353 if (h->root.root.string)
2354 name = h->root.root.string;
2355 else
2356 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2357 NULL);
2358 _bfd_error_handler
2359 /* xgettext:c-format */
2360 (_("%B: relocation %s against STT_GNU_IFUNC "
2361 "symbol `%s' isn't supported"), input_bfd,
2362 howto->name, name);
2363 bfd_set_error (bfd_error_bad_value);
2364 return FALSE;
2365
2366 case R_386_32:
2367 /* Generate dynamic relcoation only when there is a
2368 non-GOT reference in a shared object. */
2369 if ((bfd_link_pic (info) && h->non_got_ref)
2370 || h->plt.offset == (bfd_vma) -1)
2371 {
2372 Elf_Internal_Rela outrel;
2373 asection *sreloc;
2374 bfd_vma offset;
2375
2376do_ifunc_pointer:
2377 /* Need a dynamic relocation to get the real function
2378 adddress. */
2379 offset = _bfd_elf_section_offset (output_bfd,
2380 info,
2381 input_section,
2382 rel->r_offset);
2383 if (offset == (bfd_vma) -1
2384 || offset == (bfd_vma) -2)
2385 abort ();
2386
2387 outrel.r_offset = (input_section->output_section->vma
2388 + input_section->output_offset
2389 + offset);
2390
2391 if (POINTER_LOCAL_IFUNC_P (info, h))
2392 {
2393 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2394 h->root.root.string,
2395 h->root.u.def.section->owner);
2396
2397 /* This symbol is resolved locally. */
2398 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2399 bfd_put_32 (output_bfd,
2400 (h->root.u.def.value
2401 + h->root.u.def.section->output_section->vma
2402 + h->root.u.def.section->output_offset),
2403 contents + offset);
2404 }
2405 else
2406 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2407
2408 /* Dynamic relocations are stored in
2409 1. .rel.ifunc section in PIC object.
2410 2. .rel.got section in dynamic executable.
2411 3. .rel.iplt section in static executable. */
2412 if (bfd_link_pic (info))
2413 sreloc = htab->elf.irelifunc;
2414 else if (htab->elf.splt != NULL)
2415 sreloc = htab->elf.srelgot;
2416 else
2417 sreloc = htab->elf.irelplt;
2418 elf_append_rel (output_bfd, sreloc, &outrel);
2419
2420 /* If this reloc is against an external symbol, we
2421 do not want to fiddle with the addend. Otherwise,
2422 we need to include the symbol value so that it
2423 becomes an addend for the dynamic reloc. For an
2424 internal symbol, we have updated addend. */
2425 continue;
2426 }
2427 /* FALLTHROUGH */
2428 case R_386_PC32:
2429 case R_386_PLT32:
2430 goto do_relocation;
2431
2432 case R_386_GOTOFF:
2433 relocation -= (gotplt->output_section->vma
2434 + gotplt->output_offset);
2435 goto do_relocation;
2436 }
2437 }
2438
2439 resolved_to_zero = (eh != NULL
2440 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2441
2442 switch (r_type)
2443 {
2444 case R_386_GOT32X:
2445 /* Avoid optimizing _DYNAMIC since ld.so may use its
2446 link-time address. */
2447 if (h == htab->elf.hdynamic)
2448 goto r_386_got32;
2449
2450 if (bfd_link_pic (info))
2451 {
2452 /* It is OK to convert mov to lea and convert indirect
2453 branch to direct branch. It is OK to convert adc,
2454 add, and, cmp, or, sbb, sub, test, xor only when PIC
2455 is false. */
2456 unsigned int opcode, addend;
2457 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2458 if (addend != 0)
2459 goto r_386_got32;
2460 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2461 if (opcode != 0x8b && opcode != 0xff)
2462 goto r_386_got32;
2463 }
2464
2465 /* Resolve "mov GOT[(%reg)], %reg",
2466 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2467 and "binop foo@GOT[(%reg)], %reg". */
2468 if (h == NULL
2469 || (h->plt.offset == (bfd_vma) -1
2470 && h->got.offset == (bfd_vma) -1)
2471 || htab->elf.sgotplt == NULL)
2472 abort ();
2473
2474 offplt = (htab->elf.sgotplt->output_section->vma
2475 + htab->elf.sgotplt->output_offset);
2476
2477 /* It is relative to .got.plt section. */
2478 if (h->got.offset != (bfd_vma) -1)
2479 /* Use GOT entry. Mask off the least significant bit in
2480 GOT offset which may be set by R_386_GOT32 processing
2481 below. */
2482 relocation = (htab->elf.sgot->output_section->vma
2483 + htab->elf.sgot->output_offset
2484 + (h->got.offset & ~1) - offplt);
2485 else
2486 /* Use GOTPLT entry. */
2487 relocation = (h->plt.offset / plt_entry_size
2488 - htab->plt.has_plt0 + 3) * 4;
2489
2490 if (!bfd_link_pic (info))
2491 {
2492 /* If not PIC, add the .got.plt section address for
2493 baseless addressing. */
2494 unsigned int modrm;
2495 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2496 if ((modrm & 0xc7) == 0x5)
2497 relocation += offplt;
2498 }
2499
2500 unresolved_reloc = FALSE;
2501 break;
2502
2503 case R_386_GOT32:
2504r_386_got32:
2505 /* Relocation is to the entry for this symbol in the global
2506 offset table. */
2507 if (htab->elf.sgot == NULL)
2508 abort ();
2509
2510 relative_reloc = FALSE;
2511 if (h != NULL)
2512 {
2513 off = h->got.offset;
2514 if (RESOLVED_LOCALLY_P (info, h, htab))
2515 {
2516 /* We must initialize this entry in the global offset
2517 table. Since the offset must always be a multiple
2518 of 4, we use the least significant bit to record
2519 whether we have initialized it already.
2520
2521 When doing a dynamic link, we create a .rel.got
2522 relocation entry to initialize the value. This
2523 is done in the finish_dynamic_symbol routine. */
2524 if ((off & 1) != 0)
2525 off &= ~1;
2526 else
2527 {
2528 bfd_put_32 (output_bfd, relocation,
2529 htab->elf.sgot->contents + off);
2530 h->got.offset |= 1;
2531
2532 if (GENERATE_RELATIVE_RELOC_P (info, h))
2533 {
2534 /* PR ld/21402: If this symbol isn't dynamic
2535 in PIC, generate R_386_RELATIVE here. */
2536 eh->no_finish_dynamic_symbol = 1;
2537 relative_reloc = TRUE;
2538 }
2539 }
2540 }
2541 else
2542 unresolved_reloc = FALSE;
2543 }
2544 else
2545 {
2546 if (local_got_offsets == NULL)
2547 abort ();
2548
2549 off = local_got_offsets[r_symndx];
2550
2551 /* The offset must always be a multiple of 4. We use
2552 the least significant bit to record whether we have
2553 already generated the necessary reloc. */
2554 if ((off & 1) != 0)
2555 off &= ~1;
2556 else
2557 {
2558 bfd_put_32 (output_bfd, relocation,
2559 htab->elf.sgot->contents + off);
2560 local_got_offsets[r_symndx] |= 1;
2561
2562 if (bfd_link_pic (info))
2563 relative_reloc = TRUE;
2564 }
2565 }
2566
2567 if (relative_reloc)
2568 {
2569 asection *s;
2570 Elf_Internal_Rela outrel;
2571
2572 s = htab->elf.srelgot;
2573 if (s == NULL)
2574 abort ();
2575
2576 outrel.r_offset = (htab->elf.sgot->output_section->vma
2577 + htab->elf.sgot->output_offset
2578 + off);
2579 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2580 elf_append_rel (output_bfd, s, &outrel);
2581 }
2582
2583 if (off >= (bfd_vma) -2)
2584 abort ();
2585
2586 relocation = (htab->elf.sgot->output_section->vma
2587 + htab->elf.sgot->output_offset + off);
2588 if (rel->r_offset > 1
2589 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2590 && *(contents + rel->r_offset - 2) != 0x8d)
2591 {
2592 if (bfd_link_pic (info))
2593 {
2594 /* For PIC, disallow R_386_GOT32 without a base
2595 register, except for "lea foo@GOT, %reg", since
2596 we don't know what the GOT base is. */
2597 const char *name;
2598
2599disallow_got32:
2600 if (h == NULL || h->root.root.string == NULL)
2601 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2602 NULL);
2603 else
2604 name = h->root.root.string;
2605
2606 _bfd_error_handler
2607 /* xgettext:c-format */
2608 (_("%B: direct GOT relocation %s against `%s'"
2609 " without base register can not be used"
2610 " when making a shared object"),
2611 input_bfd, howto->name, name);
2612 bfd_set_error (bfd_error_bad_value);
2613 return FALSE;
2614 }
2615 }
2616 else
2617 {
2618 /* Subtract the .got.plt section address only with a base
2619 register. */
2620 relocation -= (htab->elf.sgotplt->output_section->vma
2621 + htab->elf.sgotplt->output_offset);
2622 }
2623
2624 break;
2625
2626 case R_386_GOTOFF:
2627 /* Relocation is relative to the start of the global offset
2628 table. */
2629
2630 /* Check to make sure it isn't a protected function or data
2631 symbol for shared library since it may not be local when
2632 used as function address or with copy relocation. We also
2633 need to make sure that a symbol is referenced locally. */
2634 if (!bfd_link_executable (info) && h)
2635 {
2636 if (!h->def_regular)
2637 {
2638 const char *v;
2639
2640 switch (ELF_ST_VISIBILITY (h->other))
2641 {
2642 case STV_HIDDEN:
2643 v = _("hidden symbol");
2644 break;
2645 case STV_INTERNAL:
2646 v = _("internal symbol");
2647 break;
2648 case STV_PROTECTED:
2649 v = _("protected symbol");
2650 break;
2651 default:
2652 v = _("symbol");
2653 break;
2654 }
2655
2656 _bfd_error_handler
2657 /* xgettext:c-format */
2658 (_("%B: relocation R_386_GOTOFF against undefined %s"
2659 " `%s' can not be used when making a shared object"),
2660 input_bfd, v, h->root.root.string);
2661 bfd_set_error (bfd_error_bad_value);
2662 return FALSE;
2663 }
2664 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2665 && (h->type == STT_FUNC
2666 || h->type == STT_OBJECT)
2667 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2668 {
2669 _bfd_error_handler
2670 /* xgettext:c-format */
2671 (_("%B: relocation R_386_GOTOFF against protected %s"
2672 " `%s' can not be used when making a shared object"),
2673 input_bfd,
2674 h->type == STT_FUNC ? "function" : "data",
2675 h->root.root.string);
2676 bfd_set_error (bfd_error_bad_value);
2677 return FALSE;
2678 }
2679 }
2680
2681 /* Note that sgot is not involved in this
2682 calculation. We always want the start of .got.plt. If we
2683 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2684 permitted by the ABI, we might have to change this
2685 calculation. */
2686 relocation -= htab->elf.sgotplt->output_section->vma
2687 + htab->elf.sgotplt->output_offset;
2688 break;
2689
2690 case R_386_GOTPC:
2691 /* Use global offset table as symbol value. */
2692 relocation = htab->elf.sgotplt->output_section->vma
2693 + htab->elf.sgotplt->output_offset;
2694 unresolved_reloc = FALSE;
2695 break;
2696
2697 case R_386_PLT32:
2698 /* Relocation is to the entry for this symbol in the
2699 procedure linkage table. */
2700
2701 /* Resolve a PLT32 reloc against a local symbol directly,
2702 without using the procedure linkage table. */
2703 if (h == NULL)
2704 break;
2705
2706 if ((h->plt.offset == (bfd_vma) -1
2707 && eh->plt_got.offset == (bfd_vma) -1)
2708 || htab->elf.splt == NULL)
2709 {
2710 /* We didn't make a PLT entry for this symbol. This
2711 happens when statically linking PIC code, or when
2712 using -Bsymbolic. */
2713 break;
2714 }
2715
2716 if (h->plt.offset != (bfd_vma) -1)
2717 {
2718 if (htab->plt_second != NULL)
2719 {
2720 resolved_plt = htab->plt_second;
2721 plt_offset = eh->plt_second.offset;
2722 }
2723 else
2724 {
2725 resolved_plt = htab->elf.splt;
2726 plt_offset = h->plt.offset;
2727 }
2728 }
2729 else
2730 {
2731 resolved_plt = htab->plt_got;
2732 plt_offset = eh->plt_got.offset;
2733 }
2734
2735 relocation = (resolved_plt->output_section->vma
2736 + resolved_plt->output_offset
2737 + plt_offset);
2738 unresolved_reloc = FALSE;
2739 break;
2740
2741 case R_386_SIZE32:
2742 /* Set to symbol size. */
2743 relocation = st_size;
2744 /* Fall through. */
2745
2746 case R_386_32:
2747 case R_386_PC32:
2748 if ((input_section->flags & SEC_ALLOC) == 0
2749 || is_vxworks_tls)
2750 break;
2751
2752 /* Copy dynamic function pointer relocations. Don't generate
2753 dynamic relocations against resolved undefined weak symbols
2754 in PIE, except for R_386_PC32. */
2755 if ((bfd_link_pic (info)
2756 && (h == NULL
2757 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2758 && (!resolved_to_zero
2759 || r_type == R_386_PC32))
2760 || h->root.type != bfd_link_hash_undefweak))
2761 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
2762 || !SYMBOL_CALLS_LOCAL (info, h)))
2763 || (ELIMINATE_COPY_RELOCS
2764 && !bfd_link_pic (info)
2765 && h != NULL
2766 && h->dynindx != -1
2767 && (!h->non_got_ref
2768 || eh->func_pointer_refcount > 0
2769 || (h->root.type == bfd_link_hash_undefweak
2770 && !resolved_to_zero))
2771 && ((h->def_dynamic && !h->def_regular)
2772 /* Undefined weak symbol is bound locally when
2773 PIC is false. */
2774 || h->root.type == bfd_link_hash_undefweak)))
2775 {
2776 Elf_Internal_Rela outrel;
2777 bfd_boolean skip, relocate;
2778 asection *sreloc;
2779
2780 /* When generating a shared object, these relocations
2781 are copied into the output file to be resolved at run
2782 time. */
2783
2784 skip = FALSE;
2785 relocate = FALSE;
2786
2787 outrel.r_offset =
2788 _bfd_elf_section_offset (output_bfd, info, input_section,
2789 rel->r_offset);
2790 if (outrel.r_offset == (bfd_vma) -1)
2791 skip = TRUE;
2792 else if (outrel.r_offset == (bfd_vma) -2)
2793 skip = TRUE, relocate = TRUE;
2794 outrel.r_offset += (input_section->output_section->vma
2795 + input_section->output_offset);
2796
2797 if (skip)
2798 memset (&outrel, 0, sizeof outrel);
2799 else if (h != NULL
2800 && h->dynindx != -1
2801 && (r_type == R_386_PC32
2802 || !(bfd_link_executable (info)
2803 || SYMBOLIC_BIND (info, h))
2804 || !h->def_regular))
2805 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2806 else
2807 {
2808 /* This symbol is local, or marked to become local. */
2809 relocate = TRUE;
2810 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2811 }
2812
2813 sreloc = elf_section_data (input_section)->sreloc;
2814
2815 if (sreloc == NULL || sreloc->contents == NULL)
2816 {
2817 r = bfd_reloc_notsupported;
2818 goto check_relocation_error;
2819 }
2820
2821 elf_append_rel (output_bfd, sreloc, &outrel);
2822
2823 /* If this reloc is against an external symbol, we do
2824 not want to fiddle with the addend. Otherwise, we
2825 need to include the symbol value so that it becomes
2826 an addend for the dynamic reloc. */
2827 if (! relocate)
2828 continue;
2829 }
2830 break;
2831
2832 case R_386_TLS_IE:
2833 if (!bfd_link_executable (info))
2834 {
2835 Elf_Internal_Rela outrel;
2836 asection *sreloc;
2837
2838 outrel.r_offset = rel->r_offset
2839 + input_section->output_section->vma
2840 + input_section->output_offset;
2841 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2842 sreloc = elf_section_data (input_section)->sreloc;
2843 if (sreloc == NULL)
2844 abort ();
2845 elf_append_rel (output_bfd, sreloc, &outrel);
2846 }
2847 /* Fall through */
2848
2849 case R_386_TLS_GD:
2850 case R_386_TLS_GOTDESC:
2851 case R_386_TLS_DESC_CALL:
2852 case R_386_TLS_IE_32:
2853 case R_386_TLS_GOTIE:
2854 tls_type = GOT_UNKNOWN;
2855 if (h == NULL && local_got_offsets)
2856 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2857 else if (h != NULL)
2858 tls_type = elf_x86_hash_entry(h)->tls_type;
2859 if (tls_type == GOT_TLS_IE)
2860 tls_type = GOT_TLS_IE_NEG;
2861
2862 r_type_tls = r_type;
2863 if (! elf_i386_tls_transition (info, input_bfd,
2864 input_section, contents,
2865 symtab_hdr, sym_hashes,
2866 &r_type_tls, tls_type, rel,
2867 relend, h, r_symndx, TRUE))
2868 return FALSE;
2869
2870 if (r_type_tls == R_386_TLS_LE_32)
2871 {
2872 BFD_ASSERT (! unresolved_reloc);
2873 if (r_type == R_386_TLS_GD)
2874 {
2875 unsigned int type;
2876 bfd_vma roff;
2877
2878 /* GD->LE transition. */
2879 type = *(contents + rel->r_offset - 2);
2880 if (type == 0x04)
2881 {
2882 /* Change
2883 leal foo@tlsgd(,%ebx,1), %eax
2884 call ___tls_get_addr@PLT
2885 into:
2886 movl %gs:0, %eax
2887 subl $foo@tpoff, %eax
2888 (6 byte form of subl). */
2889 roff = rel->r_offset + 5;
2890 }
2891 else
2892 {
2893 /* Change
2894 leal foo@tlsgd(%ebx), %eax
2895 call ___tls_get_addr@PLT
2896 nop
2897 or
2898 leal foo@tlsgd(%reg), %eax
2899 call *___tls_get_addr@GOT(%reg)
2900 which may be converted to
2901 addr32 call ___tls_get_addr
2902 into:
2903 movl %gs:0, %eax; subl $foo@tpoff, %eax
2904 (6 byte form of subl). */
2905 roff = rel->r_offset + 6;
2906 }
2907 memcpy (contents + roff - 8,
2908 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2909 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2910 contents + roff);
2911 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2912 rel++;
2913 wrel++;
2914 continue;
2915 }
2916 else if (r_type == R_386_TLS_GOTDESC)
2917 {
2918 /* GDesc -> LE transition.
2919 It's originally something like:
2920 leal x@tlsdesc(%ebx), %eax
2921
2922 leal x@ntpoff, %eax
2923
2924 Registers other than %eax may be set up here. */
2925
2926 unsigned int val;
2927 bfd_vma roff;
2928
2929 roff = rel->r_offset;
2930 val = bfd_get_8 (input_bfd, contents + roff - 1);
2931
2932 /* Now modify the instruction as appropriate. */
2933 /* aoliva FIXME: remove the above and xor the byte
2934 below with 0x86. */
2935 bfd_put_8 (output_bfd, val ^ 0x86,
2936 contents + roff - 1);
2937 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2938 contents + roff);
2939 continue;
2940 }
2941 else if (r_type == R_386_TLS_DESC_CALL)
2942 {
2943 /* GDesc -> LE transition.
2944 It's originally:
2945 call *(%eax)
2946 Turn it into:
2947 xchg %ax,%ax */
2948
2949 bfd_vma roff;
2950
2951 roff = rel->r_offset;
2952 bfd_put_8 (output_bfd, 0x66, contents + roff);
2953 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2954 continue;
2955 }
2956 else if (r_type == R_386_TLS_IE)
2957 {
2958 unsigned int val;
2959
2960 /* IE->LE transition:
2961 Originally it can be one of:
2962 movl foo, %eax
2963 movl foo, %reg
2964 addl foo, %reg
2965 We change it into:
2966 movl $foo, %eax
2967 movl $foo, %reg
2968 addl $foo, %reg. */
2969 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2970 if (val == 0xa1)
2971 {
2972 /* movl foo, %eax. */
2973 bfd_put_8 (output_bfd, 0xb8,
2974 contents + rel->r_offset - 1);
2975 }
2976 else
2977 {
2978 unsigned int type;
2979
2980 type = bfd_get_8 (input_bfd,
2981 contents + rel->r_offset - 2);
2982 switch (type)
2983 {
2984 case 0x8b:
2985 /* movl */
2986 bfd_put_8 (output_bfd, 0xc7,
2987 contents + rel->r_offset - 2);
2988 bfd_put_8 (output_bfd,
2989 0xc0 | ((val >> 3) & 7),
2990 contents + rel->r_offset - 1);
2991 break;
2992 case 0x03:
2993 /* addl */
2994 bfd_put_8 (output_bfd, 0x81,
2995 contents + rel->r_offset - 2);
2996 bfd_put_8 (output_bfd,
2997 0xc0 | ((val >> 3) & 7),
2998 contents + rel->r_offset - 1);
2999 break;
3000 default:
3001 BFD_FAIL ();
3002 break;
3003 }
3004 }
3005 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3006 contents + rel->r_offset);
3007 continue;
3008 }
3009 else
3010 {
3011 unsigned int val, type;
3012
3013 /* {IE_32,GOTIE}->LE transition:
3014 Originally it can be one of:
3015 subl foo(%reg1), %reg2
3016 movl foo(%reg1), %reg2
3017 addl foo(%reg1), %reg2
3018 We change it into:
3019 subl $foo, %reg2
3020 movl $foo, %reg2 (6 byte form)
3021 addl $foo, %reg2. */
3022 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3023 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3024 if (type == 0x8b)
3025 {
3026 /* movl */
3027 bfd_put_8 (output_bfd, 0xc7,
3028 contents + rel->r_offset - 2);
3029 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3030 contents + rel->r_offset - 1);
3031 }
3032 else if (type == 0x2b)
3033 {
3034 /* subl */
3035 bfd_put_8 (output_bfd, 0x81,
3036 contents + rel->r_offset - 2);
3037 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3038 contents + rel->r_offset - 1);
3039 }
3040 else if (type == 0x03)
3041 {
3042 /* addl */
3043 bfd_put_8 (output_bfd, 0x81,
3044 contents + rel->r_offset - 2);
3045 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3046 contents + rel->r_offset - 1);
3047 }
3048 else
3049 BFD_FAIL ();
3050 if (r_type == R_386_TLS_GOTIE)
3051 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3052 contents + rel->r_offset);
3053 else
3054 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3055 contents + rel->r_offset);
3056 continue;
3057 }
3058 }
3059
3060 if (htab->elf.sgot == NULL)
3061 abort ();
3062
3063 if (h != NULL)
3064 {
3065 off = h->got.offset;
3066 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3067 }
3068 else
3069 {
3070 if (local_got_offsets == NULL)
3071 abort ();
3072
3073 off = local_got_offsets[r_symndx];
3074 offplt = local_tlsdesc_gotents[r_symndx];
3075 }
3076
3077 if ((off & 1) != 0)
3078 off &= ~1;
3079 else
3080 {
3081 Elf_Internal_Rela outrel;
3082 int dr_type;
3083 asection *sreloc;
3084
3085 if (htab->elf.srelgot == NULL)
3086 abort ();
3087
3088 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3089
3090 if (GOT_TLS_GDESC_P (tls_type))
3091 {
3092 bfd_byte *loc;
3093 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3094 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3095 <= htab->elf.sgotplt->size);
3096 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3097 + htab->elf.sgotplt->output_offset
3098 + offplt
3099 + htab->sgotplt_jump_table_size);
3100 sreloc = htab->elf.srelplt;
3101 loc = sreloc->contents;
3102 loc += (htab->next_tls_desc_index++
3103 * sizeof (Elf32_External_Rel));
3104 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3105 <= sreloc->contents + sreloc->size);
3106 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3107 if (indx == 0)
3108 {
3109 BFD_ASSERT (! unresolved_reloc);
3110 bfd_put_32 (output_bfd,
3111 relocation - _bfd_x86_elf_dtpoff_base (info),
3112 htab->elf.sgotplt->contents + offplt
3113 + htab->sgotplt_jump_table_size + 4);
3114 }
3115 else
3116 {
3117 bfd_put_32 (output_bfd, 0,
3118 htab->elf.sgotplt->contents + offplt
3119 + htab->sgotplt_jump_table_size + 4);
3120 }
3121 }
3122
3123 sreloc = htab->elf.srelgot;
3124
3125 outrel.r_offset = (htab->elf.sgot->output_section->vma
3126 + htab->elf.sgot->output_offset + off);
3127
3128 if (GOT_TLS_GD_P (tls_type))
3129 dr_type = R_386_TLS_DTPMOD32;
3130 else if (GOT_TLS_GDESC_P (tls_type))
3131 goto dr_done;
3132 else if (tls_type == GOT_TLS_IE_POS)
3133 dr_type = R_386_TLS_TPOFF;
3134 else
3135 dr_type = R_386_TLS_TPOFF32;
3136
3137 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3138 bfd_put_32 (output_bfd,
3139 relocation - _bfd_x86_elf_dtpoff_base (info),
3140 htab->elf.sgot->contents + off);
3141 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3142 bfd_put_32 (output_bfd,
3143 _bfd_x86_elf_dtpoff_base (info) - relocation,
3144 htab->elf.sgot->contents + off);
3145 else if (dr_type != R_386_TLS_DESC)
3146 bfd_put_32 (output_bfd, 0,
3147 htab->elf.sgot->contents + off);
3148 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3149
3150 elf_append_rel (output_bfd, sreloc, &outrel);
3151
3152 if (GOT_TLS_GD_P (tls_type))
3153 {
3154 if (indx == 0)
3155 {
3156 BFD_ASSERT (! unresolved_reloc);
3157 bfd_put_32 (output_bfd,
3158 relocation - _bfd_x86_elf_dtpoff_base (info),
3159 htab->elf.sgot->contents + off + 4);
3160 }
3161 else
3162 {
3163 bfd_put_32 (output_bfd, 0,
3164 htab->elf.sgot->contents + off + 4);
3165 outrel.r_info = ELF32_R_INFO (indx,
3166 R_386_TLS_DTPOFF32);
3167 outrel.r_offset += 4;
3168 elf_append_rel (output_bfd, sreloc, &outrel);
3169 }
3170 }
3171 else if (tls_type == GOT_TLS_IE_BOTH)
3172 {
3173 bfd_put_32 (output_bfd,
3174 (indx == 0
3175 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3176 : 0),
3177 htab->elf.sgot->contents + off + 4);
3178 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3179 outrel.r_offset += 4;
3180 elf_append_rel (output_bfd, sreloc, &outrel);
3181 }
3182
3183 dr_done:
3184 if (h != NULL)
3185 h->got.offset |= 1;
3186 else
3187 local_got_offsets[r_symndx] |= 1;
3188 }
3189
3190 if (off >= (bfd_vma) -2
3191 && ! GOT_TLS_GDESC_P (tls_type))
3192 abort ();
3193 if (r_type_tls == R_386_TLS_GOTDESC
3194 || r_type_tls == R_386_TLS_DESC_CALL)
3195 {
3196 relocation = htab->sgotplt_jump_table_size + offplt;
3197 unresolved_reloc = FALSE;
3198 }
3199 else if (r_type_tls == r_type)
3200 {
3201 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3202 + htab->elf.sgotplt->output_offset;
3203 relocation = htab->elf.sgot->output_section->vma
3204 + htab->elf.sgot->output_offset + off - g_o_t;
3205 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3206 && tls_type == GOT_TLS_IE_BOTH)
3207 relocation += 4;
3208 if (r_type == R_386_TLS_IE)
3209 relocation += g_o_t;
3210 unresolved_reloc = FALSE;
3211 }
3212 else if (r_type == R_386_TLS_GD)
3213 {
3214 unsigned int val, type;
3215 bfd_vma roff;
3216
3217 /* GD->IE transition. */
3218 type = *(contents + rel->r_offset - 2);
3219 val = *(contents + rel->r_offset - 1);
3220 if (type == 0x04)
3221 {
3222 /* Change
3223 leal foo@tlsgd(,%ebx,1), %eax
3224 call ___tls_get_addr@PLT
3225 into:
3226 movl %gs:0, %eax
3227 subl $foo@gottpoff(%ebx), %eax. */
3228 val >>= 3;
3229 roff = rel->r_offset - 3;
3230 }
3231 else
3232 {
3233 /* Change
3234 leal foo@tlsgd(%ebx), %eax
3235 call ___tls_get_addr@PLT
3236 nop
3237 or
3238 leal foo@tlsgd(%reg), %eax
3239 call *___tls_get_addr@GOT(%reg)
3240 which may be converted to
3241 addr32 call ___tls_get_addr
3242 into:
3243 movl %gs:0, %eax;
3244 subl $foo@gottpoff(%reg), %eax. */
3245 roff = rel->r_offset - 2;
3246 }
3247 memcpy (contents + roff,
3248 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3249 contents[roff + 7] = 0x80 | (val & 7);
3250 /* If foo is used only with foo@gotntpoff(%reg) and
3251 foo@indntpoff, but not with foo@gottpoff(%reg), change
3252 subl $foo@gottpoff(%reg), %eax
3253 into:
3254 addl $foo@gotntpoff(%reg), %eax. */
3255 if (tls_type == GOT_TLS_IE_POS)
3256 contents[roff + 6] = 0x03;
3257 bfd_put_32 (output_bfd,
3258 htab->elf.sgot->output_section->vma
3259 + htab->elf.sgot->output_offset + off
3260 - htab->elf.sgotplt->output_section->vma
3261 - htab->elf.sgotplt->output_offset,
3262 contents + roff + 8);
3263 /* Skip R_386_PLT32 and R_386_GOT32X. */
3264 rel++;
3265 wrel++;
3266 continue;
3267 }
3268 else if (r_type == R_386_TLS_GOTDESC)
3269 {
3270 /* GDesc -> IE transition.
3271 It's originally something like:
3272 leal x@tlsdesc(%ebx), %eax
3273
3274 Change it to:
3275 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3276 or:
3277 movl x@gottpoff(%ebx), %eax # before negl %eax
3278
3279 Registers other than %eax may be set up here. */
3280
3281 bfd_vma roff;
3282
3283 /* First, make sure it's a leal adding ebx to a 32-bit
3284 offset into any register, although it's probably
3285 almost always going to be eax. */
3286 roff = rel->r_offset;
3287
3288 /* Now modify the instruction as appropriate. */
3289 /* To turn a leal into a movl in the form we use it, it
3290 suffices to change the first byte from 0x8d to 0x8b.
3291 aoliva FIXME: should we decide to keep the leal, all
3292 we have to do is remove the statement below, and
3293 adjust the relaxation of R_386_TLS_DESC_CALL. */
3294 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3295
3296 if (tls_type == GOT_TLS_IE_BOTH)
3297 off += 4;
3298
3299 bfd_put_32 (output_bfd,
3300 htab->elf.sgot->output_section->vma
3301 + htab->elf.sgot->output_offset + off
3302 - htab->elf.sgotplt->output_section->vma
3303 - htab->elf.sgotplt->output_offset,
3304 contents + roff);
3305 continue;
3306 }
3307 else if (r_type == R_386_TLS_DESC_CALL)
3308 {
3309 /* GDesc -> IE transition.
3310 It's originally:
3311 call *(%eax)
3312
3313 Change it to:
3314 xchg %ax,%ax
3315 or
3316 negl %eax
3317 depending on how we transformed the TLS_GOTDESC above.
3318 */
3319
3320 bfd_vma roff;
3321
3322 roff = rel->r_offset;
3323
3324 /* Now modify the instruction as appropriate. */
3325 if (tls_type != GOT_TLS_IE_NEG)
3326 {
3327 /* xchg %ax,%ax */
3328 bfd_put_8 (output_bfd, 0x66, contents + roff);
3329 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3330 }
3331 else
3332 {
3333 /* negl %eax */
3334 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3335 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3336 }
3337
3338 continue;
3339 }
3340 else
3341 BFD_ASSERT (FALSE);
3342 break;
3343
3344 case R_386_TLS_LDM:
3345 if (! elf_i386_tls_transition (info, input_bfd,
3346 input_section, contents,
3347 symtab_hdr, sym_hashes,
3348 &r_type, GOT_UNKNOWN, rel,
3349 relend, h, r_symndx, TRUE))
3350 return FALSE;
3351
3352 if (r_type != R_386_TLS_LDM)
3353 {
3354 /* LD->LE transition. Change
3355 leal foo@tlsldm(%ebx) %eax
3356 call ___tls_get_addr@PLT
3357 into:
3358 movl %gs:0, %eax
3359 nop
3360 leal 0(%esi,1), %esi
3361 or change
3362 leal foo@tlsldm(%reg) %eax
3363 call *___tls_get_addr@GOT(%reg)
3364 which may be converted to
3365 addr32 call ___tls_get_addr
3366 into:
3367 movl %gs:0, %eax
3368 leal 0(%esi), %esi */
3369 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3370 if (*(contents + rel->r_offset + 4) == 0xff
3371 || *(contents + rel->r_offset + 4) == 0x67)
3372 memcpy (contents + rel->r_offset - 2,
3373 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3374 else
3375 memcpy (contents + rel->r_offset - 2,
3376 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3377 /* Skip R_386_PC32/R_386_PLT32. */
3378 rel++;
3379 wrel++;
3380 continue;
3381 }
3382
3383 if (htab->elf.sgot == NULL)
3384 abort ();
3385
3386 off = htab->tls_ld_or_ldm_got.offset;
3387 if (off & 1)
3388 off &= ~1;
3389 else
3390 {
3391 Elf_Internal_Rela outrel;
3392
3393 if (htab->elf.srelgot == NULL)
3394 abort ();
3395
3396 outrel.r_offset = (htab->elf.sgot->output_section->vma
3397 + htab->elf.sgot->output_offset + off);
3398
3399 bfd_put_32 (output_bfd, 0,
3400 htab->elf.sgot->contents + off);
3401 bfd_put_32 (output_bfd, 0,
3402 htab->elf.sgot->contents + off + 4);
3403 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3404 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3405 htab->tls_ld_or_ldm_got.offset |= 1;
3406 }
3407 relocation = htab->elf.sgot->output_section->vma
3408 + htab->elf.sgot->output_offset + off
3409 - htab->elf.sgotplt->output_section->vma
3410 - htab->elf.sgotplt->output_offset;
3411 unresolved_reloc = FALSE;
3412 break;
3413
3414 case R_386_TLS_LDO_32:
3415 if (!bfd_link_executable (info)
3416 || (input_section->flags & SEC_CODE) == 0)
3417 relocation -= _bfd_x86_elf_dtpoff_base (info);
3418 else
3419 /* When converting LDO to LE, we must negate. */
3420 relocation = -elf_i386_tpoff (info, relocation);
3421 break;
3422
3423 case R_386_TLS_LE_32:
3424 case R_386_TLS_LE:
3425 if (!bfd_link_executable (info))
3426 {
3427 Elf_Internal_Rela outrel;
3428 asection *sreloc;
3429
3430 outrel.r_offset = rel->r_offset
3431 + input_section->output_section->vma
3432 + input_section->output_offset;
3433 if (h != NULL && h->dynindx != -1)
3434 indx = h->dynindx;
3435 else
3436 indx = 0;
3437 if (r_type == R_386_TLS_LE_32)
3438 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3439 else
3440 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3441 sreloc = elf_section_data (input_section)->sreloc;
3442 if (sreloc == NULL)
3443 abort ();
3444 elf_append_rel (output_bfd, sreloc, &outrel);
3445 if (indx)
3446 continue;
3447 else if (r_type == R_386_TLS_LE_32)
3448 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3449 else
3450 relocation -= _bfd_x86_elf_dtpoff_base (info);
3451 }
3452 else if (r_type == R_386_TLS_LE_32)
3453 relocation = elf_i386_tpoff (info, relocation);
3454 else
3455 relocation = -elf_i386_tpoff (info, relocation);
3456 break;
3457
3458 default:
3459 break;
3460 }
3461
3462 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3463 because such sections are not SEC_ALLOC and thus ld.so will
3464 not process them. */
3465 if (unresolved_reloc
3466 && !((input_section->flags & SEC_DEBUGGING) != 0
3467 && h->def_dynamic)
3468 && _bfd_elf_section_offset (output_bfd, info, input_section,
3469 rel->r_offset) != (bfd_vma) -1)
3470 {
3471 _bfd_error_handler
3472 /* xgettext:c-format */
3473 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3474 input_bfd,
3475 input_section,
3476 rel->r_offset,
3477 howto->name,
3478 h->root.root.string);
3479 return FALSE;
3480 }
3481
3482do_relocation:
3483 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3484 contents, rel->r_offset,
3485 relocation, 0);
3486
3487check_relocation_error:
3488 if (r != bfd_reloc_ok)
3489 {
3490 const char *name;
3491
3492 if (h != NULL)
3493 name = h->root.root.string;
3494 else
3495 {
3496 name = bfd_elf_string_from_elf_section (input_bfd,
3497 symtab_hdr->sh_link,
3498 sym->st_name);
3499 if (name == NULL)
3500 return FALSE;
3501 if (*name == '\0')
3502 name = bfd_section_name (input_bfd, sec);
3503 }
3504
3505 if (r == bfd_reloc_overflow)
3506 (*info->callbacks->reloc_overflow)
3507 (info, (h ? &h->root : NULL), name, howto->name,
3508 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3509 else
3510 {
3511 _bfd_error_handler
3512 /* xgettext:c-format */
3513 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3514 input_bfd, input_section,
3515 rel->r_offset, name, (int) r);
3516 return FALSE;
3517 }
3518 }
3519
3520 if (wrel != rel)
3521 *wrel = *rel;
3522 }
3523
3524 if (wrel != rel)
3525 {
3526 Elf_Internal_Shdr *rel_hdr;
3527 size_t deleted = rel - wrel;
3528
3529 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3530 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3531 if (rel_hdr->sh_size == 0)
3532 {
3533 /* It is too late to remove an empty reloc section. Leave
3534 one NONE reloc.
3535 ??? What is wrong with an empty section??? */
3536 rel_hdr->sh_size = rel_hdr->sh_entsize;
3537 deleted -= 1;
3538 }
3539 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3540 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3541 input_section->reloc_count -= deleted;
3542 }
3543
3544 return TRUE;
3545}
3546
3547/* Finish up dynamic symbol handling. We set the contents of various
3548 dynamic sections here. */
3549
3550static bfd_boolean
3551elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3552 struct bfd_link_info *info,
3553 struct elf_link_hash_entry *h,
3554 Elf_Internal_Sym *sym)
3555{
3556 struct elf_x86_link_hash_table *htab;
3557 unsigned plt_entry_size;
3558 struct elf_x86_link_hash_entry *eh;
3559 bfd_boolean local_undefweak;
3560 bfd_boolean use_plt_second;
3561
3562 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3563 if (htab == NULL)
3564 return FALSE;
3565
3566 plt_entry_size = htab->plt.plt_entry_size;
3567
3568 /* Use the second PLT section only if there is .plt section. */
3569 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3570
3571 eh = (struct elf_x86_link_hash_entry *) h;
3572 if (eh->no_finish_dynamic_symbol)
3573 abort ();
3574
3575 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3576 resolved undefined weak symbols in executable so that their
3577 references have value 0 at run-time. */
3578 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3579
3580 if (h->plt.offset != (bfd_vma) -1)
3581 {
3582 bfd_vma plt_index, plt_offset;
3583 bfd_vma got_offset;
3584 Elf_Internal_Rela rel;
3585 bfd_byte *loc;
3586 asection *plt, *resolved_plt, *gotplt, *relplt;
3587
3588 /* When building a static executable, use .iplt, .igot.plt and
3589 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3590 if (htab->elf.splt != NULL)
3591 {
3592 plt = htab->elf.splt;
3593 gotplt = htab->elf.sgotplt;
3594 relplt = htab->elf.srelplt;
3595 }
3596 else
3597 {
3598 plt = htab->elf.iplt;
3599 gotplt = htab->elf.igotplt;
3600 relplt = htab->elf.irelplt;
3601 }
3602
3603 /* This symbol has an entry in the procedure linkage table. Set
3604 it up. */
3605
3606 if ((h->dynindx == -1
3607 && !local_undefweak
3608 && !((h->forced_local || bfd_link_executable (info))
3609 && h->def_regular
3610 && h->type == STT_GNU_IFUNC))
3611 || plt == NULL
3612 || gotplt == NULL
3613 || relplt == NULL)
3614 abort ();
3615
3616 /* Get the index in the procedure linkage table which
3617 corresponds to this symbol. This is the index of this symbol
3618 in all the symbols for which we are making plt entries. The
3619 first entry in the procedure linkage table is reserved.
3620
3621 Get the offset into the .got table of the entry that
3622 corresponds to this function. Each .got entry is 4 bytes.
3623 The first three are reserved.
3624
3625 For static executables, we don't reserve anything. */
3626
3627 if (plt == htab->elf.splt)
3628 {
3629 got_offset = (h->plt.offset / plt_entry_size
3630 - htab->plt.has_plt0);
3631 got_offset = (got_offset + 3) * 4;
3632 }
3633 else
3634 {
3635 got_offset = h->plt.offset / plt_entry_size;
3636 got_offset = got_offset * 4;
3637 }
3638
3639 /* Fill in the entry in the procedure linkage table and update
3640 the first slot. */
3641 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3642 plt_entry_size);
3643
3644 if (use_plt_second)
3645 {
3646 const bfd_byte *plt_entry;
3647 if (bfd_link_pic (info))
3648 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3649 else
3650 plt_entry = htab->non_lazy_plt->plt_entry;
3651 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3652 plt_entry, htab->non_lazy_plt->plt_entry_size);
3653
3654 resolved_plt = htab->plt_second;
3655 plt_offset = eh->plt_second.offset;
3656 }
3657 else
3658 {
3659 resolved_plt = plt;
3660 plt_offset = h->plt.offset;
3661 }
3662
3663 if (! bfd_link_pic (info))
3664 {
3665 bfd_put_32 (output_bfd,
3666 (gotplt->output_section->vma
3667 + gotplt->output_offset
3668 + got_offset),
3669 resolved_plt->contents + plt_offset
3670 + htab->plt.plt_got_offset);
3671
3672 if (htab->is_vxworks)
3673 {
3674 int s, k, reloc_index;
3675
3676 /* Create the R_386_32 relocation referencing the GOT
3677 for this PLT entry. */
3678
3679 /* S: Current slot number (zero-based). */
3680 s = ((h->plt.offset - htab->plt.plt_entry_size)
3681 / htab->plt.plt_entry_size);
3682 /* K: Number of relocations for PLTResolve. */
3683 if (bfd_link_pic (info))
3684 k = PLTRESOLVE_RELOCS_SHLIB;
3685 else
3686 k = PLTRESOLVE_RELOCS;
3687 /* Skip the PLTresolve relocations, and the relocations for
3688 the other PLT slots. */
3689 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3690 loc = (htab->srelplt2->contents + reloc_index
3691 * sizeof (Elf32_External_Rel));
3692
3693 rel.r_offset = (plt->output_section->vma
3694 + plt->output_offset
3695 + h->plt.offset + 2),
3696 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3697 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3698
3699 /* Create the R_386_32 relocation referencing the beginning of
3700 the PLT for this GOT entry. */
3701 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3702 + htab->elf.sgotplt->output_offset
3703 + got_offset);
3704 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3705 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3706 loc + sizeof (Elf32_External_Rel));
3707 }
3708 }
3709 else
3710 {
3711 bfd_put_32 (output_bfd, got_offset,
3712 resolved_plt->contents + plt_offset
3713 + htab->plt.plt_got_offset);
3714 }
3715
3716 /* Fill in the entry in the global offset table. Leave the entry
3717 as zero for undefined weak symbol in PIE. No PLT relocation
3718 against undefined weak symbol in PIE. */
3719 if (!local_undefweak)
3720 {
3721 if (htab->plt.has_plt0)
3722 bfd_put_32 (output_bfd,
3723 (plt->output_section->vma
3724 + plt->output_offset
3725 + h->plt.offset
3726 + htab->lazy_plt->plt_lazy_offset),
3727 gotplt->contents + got_offset);
3728
3729 /* Fill in the entry in the .rel.plt section. */
3730 rel.r_offset = (gotplt->output_section->vma
3731 + gotplt->output_offset
3732 + got_offset);
3733 if (PLT_LOCAL_IFUNC_P (info, h))
3734 {
3735 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3736 h->root.root.string,
3737 h->root.u.def.section->owner);
3738
3739 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3740 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3741 in the .got.plt section. */
3742 bfd_put_32 (output_bfd,
3743 (h->root.u.def.value
3744 + h->root.u.def.section->output_section->vma
3745 + h->root.u.def.section->output_offset),
3746 gotplt->contents + got_offset);
3747 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3748 /* R_386_IRELATIVE comes last. */
3749 plt_index = htab->next_irelative_index--;
3750 }
3751 else
3752 {
3753 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3754 plt_index = htab->next_jump_slot_index++;
3755 }
3756
3757 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3758 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3759
3760 /* Don't fill the second and third slots in PLT entry for
3761 static executables nor without PLT0. */
3762 if (plt == htab->elf.splt && htab->plt.has_plt0)
3763 {
3764 bfd_put_32 (output_bfd,
3765 plt_index * sizeof (Elf32_External_Rel),
3766 plt->contents + h->plt.offset
3767 + htab->lazy_plt->plt_reloc_offset);
3768 bfd_put_32 (output_bfd,
3769 - (h->plt.offset
3770 + htab->lazy_plt->plt_plt_offset + 4),
3771 (plt->contents + h->plt.offset
3772 + htab->lazy_plt->plt_plt_offset));
3773 }
3774 }
3775 }
3776 else if (eh->plt_got.offset != (bfd_vma) -1)
3777 {
3778 bfd_vma got_offset, plt_offset;
3779 asection *plt, *got, *gotplt;
3780 const bfd_byte *got_plt_entry;
3781
3782 /* Set the entry in the GOT procedure linkage table. */
3783 plt = htab->plt_got;
3784 got = htab->elf.sgot;
3785 gotplt = htab->elf.sgotplt;
3786 got_offset = h->got.offset;
3787
3788 if (got_offset == (bfd_vma) -1
3789 || plt == NULL
3790 || got == NULL
3791 || gotplt == NULL)
3792 abort ();
3793
3794 /* Fill in the entry in the GOT procedure linkage table. */
3795 if (! bfd_link_pic (info))
3796 {
3797 got_plt_entry = htab->non_lazy_plt->plt_entry;
3798 got_offset += got->output_section->vma + got->output_offset;
3799 }
3800 else
3801 {
3802 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3803 got_offset += (got->output_section->vma
3804 + got->output_offset
3805 - gotplt->output_section->vma
3806 - gotplt->output_offset);
3807 }
3808
3809 plt_offset = eh->plt_got.offset;
3810 memcpy (plt->contents + plt_offset, got_plt_entry,
3811 htab->non_lazy_plt->plt_entry_size);
3812 bfd_put_32 (output_bfd, got_offset,
3813 (plt->contents + plt_offset
3814 + htab->non_lazy_plt->plt_got_offset));
3815 }
3816
3817 if (!local_undefweak
3818 && !h->def_regular
3819 && (h->plt.offset != (bfd_vma) -1
3820 || eh->plt_got.offset != (bfd_vma) -1))
3821 {
3822 /* Mark the symbol as undefined, rather than as defined in
3823 the .plt section. Leave the value if there were any
3824 relocations where pointer equality matters (this is a clue
3825 for the dynamic linker, to make function pointer
3826 comparisons work between an application and shared
3827 library), otherwise set it to zero. If a function is only
3828 called from a binary, there is no need to slow down
3829 shared libraries because of that. */
3830 sym->st_shndx = SHN_UNDEF;
3831 if (!h->pointer_equality_needed)
3832 sym->st_value = 0;
3833 }
3834
3835 /* Don't generate dynamic GOT relocation against undefined weak
3836 symbol in executable. */
3837 if (h->got.offset != (bfd_vma) -1
3838 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3839 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3840 && !local_undefweak)
3841 {
3842 Elf_Internal_Rela rel;
3843 asection *relgot = htab->elf.srelgot;
3844
3845 /* This symbol has an entry in the global offset table. Set it
3846 up. */
3847
3848 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3849 abort ();
3850
3851 rel.r_offset = (htab->elf.sgot->output_section->vma
3852 + htab->elf.sgot->output_offset
3853 + (h->got.offset & ~(bfd_vma) 1));
3854
3855 /* If this is a static link, or it is a -Bsymbolic link and the
3856 symbol is defined locally or was forced to be local because
3857 of a version file, we just want to emit a RELATIVE reloc.
3858 The entry in the global offset table will already have been
3859 initialized in the relocate_section function. */
3860 if (h->def_regular
3861 && h->type == STT_GNU_IFUNC)
3862 {
3863 if (h->plt.offset == (bfd_vma) -1)
3864 {
3865 /* STT_GNU_IFUNC is referenced without PLT. */
3866 if (htab->elf.splt == NULL)
3867 {
3868 /* use .rel[a].iplt section to store .got relocations
3869 in static executable. */
3870 relgot = htab->elf.irelplt;
3871 }
3872 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3873 {
3874 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3875 h->root.root.string,
3876 h->root.u.def.section->owner);
3877
3878 bfd_put_32 (output_bfd,
3879 (h->root.u.def.value
3880 + h->root.u.def.section->output_section->vma
3881 + h->root.u.def.section->output_offset),
3882 htab->elf.sgot->contents + h->got.offset);
3883 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3884 }
3885 else
3886 goto do_glob_dat;
3887 }
3888 else if (bfd_link_pic (info))
3889 {
3890 /* Generate R_386_GLOB_DAT. */
3891 goto do_glob_dat;
3892 }
3893 else
3894 {
3895 asection *plt;
3896 bfd_vma plt_offset;
3897
3898 if (!h->pointer_equality_needed)
3899 abort ();
3900
3901 /* For non-shared object, we can't use .got.plt, which
3902 contains the real function addres if we need pointer
3903 equality. We load the GOT entry with the PLT entry. */
3904 if (htab->plt_second != NULL)
3905 {
3906 plt = htab->plt_second;
3907 plt_offset = eh->plt_second.offset;
3908 }
3909 else
3910 {
3911 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3912 plt_offset = h->plt.offset;
3913 }
3914 bfd_put_32 (output_bfd,
3915 (plt->output_section->vma
3916 + plt->output_offset + plt_offset),
3917 htab->elf.sgot->contents + h->got.offset);
3918 return TRUE;
3919 }
3920 }
3921 else if (bfd_link_pic (info)
3922 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3923 {
3924 BFD_ASSERT((h->got.offset & 1) != 0);
3925 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3926 }
3927 else
3928 {
3929 BFD_ASSERT((h->got.offset & 1) == 0);
3930do_glob_dat:
3931 bfd_put_32 (output_bfd, (bfd_vma) 0,
3932 htab->elf.sgot->contents + h->got.offset);
3933 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3934 }
3935
3936 elf_append_rel (output_bfd, relgot, &rel);
3937 }
3938
3939 if (h->needs_copy)
3940 {
3941 Elf_Internal_Rela rel;
3942 asection *s;
3943
3944 /* This symbol needs a copy reloc. Set it up. */
3945
3946 if (h->dynindx == -1
3947 || (h->root.type != bfd_link_hash_defined
3948 && h->root.type != bfd_link_hash_defweak)
3949 || htab->elf.srelbss == NULL
3950 || htab->elf.sreldynrelro == NULL)
3951 abort ();
3952
3953 rel.r_offset = (h->root.u.def.value
3954 + h->root.u.def.section->output_section->vma
3955 + h->root.u.def.section->output_offset);
3956 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3957 if (h->root.u.def.section == htab->elf.sdynrelro)
3958 s = htab->elf.sreldynrelro;
3959 else
3960 s = htab->elf.srelbss;
3961 elf_append_rel (output_bfd, s, &rel);
3962 }
3963
3964 return TRUE;
3965}
3966
3967/* Finish up local dynamic symbol handling. We set the contents of
3968 various dynamic sections here. */
3969
3970static bfd_boolean
3971elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3972{
3973 struct elf_link_hash_entry *h
3974 = (struct elf_link_hash_entry *) *slot;
3975 struct bfd_link_info *info
3976 = (struct bfd_link_info *) inf;
3977
3978 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3979 h, NULL);
3980}
3981
3982/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3983 here since undefined weak symbol may not be dynamic and may not be
3984 called for elf_i386_finish_dynamic_symbol. */
3985
3986static bfd_boolean
3987elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3988 void *inf)
3989{
3990 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3991 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3992
3993 if (h->root.type != bfd_link_hash_undefweak
3994 || h->dynindx != -1)
3995 return TRUE;
3996
3997 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3998 info, h, NULL);
3999}
4000
4001/* Used to decide how to sort relocs in an optimal manner for the
4002 dynamic linker, before writing them out. */
4003
4004static enum elf_reloc_type_class
4005elf_i386_reloc_type_class (const struct bfd_link_info *info,
4006 const asection *rel_sec ATTRIBUTE_UNUSED,
4007 const Elf_Internal_Rela *rela)
4008{
4009 bfd *abfd = info->output_bfd;
4010 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4011 struct elf_link_hash_table *htab = elf_hash_table (info);
4012
4013 if (htab->dynsym != NULL
4014 && htab->dynsym->contents != NULL)
4015 {
4016 /* Check relocation against STT_GNU_IFUNC symbol if there are
4017 dynamic symbols. */
4018 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4019 if (r_symndx != STN_UNDEF)
4020 {
4021 Elf_Internal_Sym sym;
4022 if (!bed->s->swap_symbol_in (abfd,
4023 (htab->dynsym->contents
4024 + r_symndx * sizeof (Elf32_External_Sym)),
4025 0, &sym))
4026 abort ();
4027
4028 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4029 return reloc_class_ifunc;
4030 }
4031 }
4032
4033 switch (ELF32_R_TYPE (rela->r_info))
4034 {
4035 case R_386_IRELATIVE:
4036 return reloc_class_ifunc;
4037 case R_386_RELATIVE:
4038 return reloc_class_relative;
4039 case R_386_JUMP_SLOT:
4040 return reloc_class_plt;
4041 case R_386_COPY:
4042 return reloc_class_copy;
4043 default:
4044 return reloc_class_normal;
4045 }
4046}
4047
4048/* Finish up the dynamic sections. */
4049
4050static bfd_boolean
4051elf_i386_finish_dynamic_sections (bfd *output_bfd,
4052 struct bfd_link_info *info)
4053{
4054 struct elf_x86_link_hash_table *htab;
4055 bfd *dynobj;
4056 asection *sdyn;
4057 const struct elf_i386_backend_data *abed;
4058
4059 htab = elf_x86_hash_table (info, I386_ELF_DATA);
4060 if (htab == NULL)
4061 return FALSE;
4062
4063 dynobj = htab->elf.dynobj;
4064 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4065 abed = get_elf_i386_backend_data (output_bfd);
4066
4067 if (htab->elf.dynamic_sections_created)
4068 {
4069 Elf32_External_Dyn *dyncon, *dynconend;
4070
4071 if (sdyn == NULL || htab->elf.sgot == NULL)
4072 abort ();
4073
4074 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4075 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4076 for (; dyncon < dynconend; dyncon++)
4077 {
4078 Elf_Internal_Dyn dyn;
4079 asection *s;
4080
4081 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4082
4083 switch (dyn.d_tag)
4084 {
4085 default:
4086 if (htab->is_vxworks
4087 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4088 break;
4089 continue;
4090
4091 case DT_PLTGOT:
4092 s = htab->elf.sgotplt;
4093 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4094 break;
4095
4096 case DT_JMPREL:
4097 s = htab->elf.srelplt;
4098 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4099 break;
4100
4101 case DT_PLTRELSZ:
4102 s = htab->elf.srelplt;
4103 dyn.d_un.d_val = s->size;
4104 break;
4105 }
4106
4107 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4108 }
4109
4110 if (htab->elf.splt && htab->elf.splt->size > 0)
4111 {
4112 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4113 really seem like the right value. */
4114 elf_section_data (htab->elf.splt->output_section)
4115 ->this_hdr.sh_entsize = 4;
4116
4117 if (htab->plt.has_plt0)
4118 {
4119 /* Fill in the special first entry in the procedure linkage
4120 table. */
4121 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4122 htab->lazy_plt->plt0_entry_size);
4123 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4124 abed->plt0_pad_byte,
4125 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4126 if (!bfd_link_pic (info))
4127 {
4128 bfd_put_32 (output_bfd,
4129 (htab->elf.sgotplt->output_section->vma
4130 + htab->elf.sgotplt->output_offset
4131 + 4),
4132 htab->elf.splt->contents
4133 + htab->lazy_plt->plt0_got1_offset);
4134 bfd_put_32 (output_bfd,
4135 (htab->elf.sgotplt->output_section->vma
4136 + htab->elf.sgotplt->output_offset
4137 + 8),
4138 htab->elf.splt->contents
4139 + htab->lazy_plt->plt0_got2_offset);
4140
4141 if (htab->is_vxworks)
4142 {
4143 Elf_Internal_Rela rel;
4144 int num_plts = (htab->elf.splt->size
4145 / htab->plt.plt_entry_size) - 1;
4146 unsigned char *p;
4147 asection *srelplt2 = htab->srelplt2;
4148
4149 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4150 + 4. On IA32 we use REL relocations so the
4151 addend goes in the PLT directly. */
4152 rel.r_offset = (htab->elf.splt->output_section->vma
4153 + htab->elf.splt->output_offset
4154 + htab->lazy_plt->plt0_got1_offset);
4155 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4156 R_386_32);
4157 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4158 srelplt2->contents);
4159 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4160 + 8. */
4161 rel.r_offset = (htab->elf.splt->output_section->vma
4162 + htab->elf.splt->output_offset
4163 + htab->lazy_plt->plt0_got2_offset);
4164 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4165 R_386_32);
4166 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4167 srelplt2->contents +
4168 sizeof (Elf32_External_Rel));
4169 /* Correct the .rel.plt.unloaded relocations. */
4170 p = srelplt2->contents;
4171 if (bfd_link_pic (info))
4172 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4173 else
4174 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4175
4176 for (; num_plts; num_plts--)
4177 {
4178 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4179 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4180 R_386_32);
4181 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4182 p += sizeof (Elf32_External_Rel);
4183
4184 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4185 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4186 R_386_32);
4187 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4188 p += sizeof (Elf32_External_Rel);
4189 }
4190 }
4191 }
4192 }
4193 }
4194
4195 if (htab->plt_got != NULL && htab->plt_got->size > 0)
4196 elf_section_data (htab->plt_got->output_section)
4197 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4198
4199 if (htab->plt_second != NULL && htab->plt_second->size > 0)
4200 elf_section_data (htab->plt_second->output_section)
4201 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4202 }
4203
4204 /* Fill in the first three entries in the global offset table. */
4205 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
4206 {
4207 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4208 {
4209 _bfd_error_handler
4210 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4211 return FALSE;
4212 }
4213
4214 bfd_put_32 (output_bfd,
4215 (sdyn == NULL ? 0
4216 : sdyn->output_section->vma + sdyn->output_offset),
4217 htab->elf.sgotplt->contents);
4218 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4219 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4220
4221 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4222 }
4223
4224 /* Adjust .eh_frame for .plt section. */
4225 if (htab->plt_eh_frame != NULL
4226 && htab->plt_eh_frame->contents != NULL)
4227 {
4228 if (htab->elf.splt != NULL
4229 && htab->elf.splt->size != 0
4230 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4231 && htab->elf.splt->output_section != NULL
4232 && htab->plt_eh_frame->output_section != NULL)
4233 {
4234 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4235 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4236 + htab->plt_eh_frame->output_offset
4237 + PLT_FDE_START_OFFSET;
4238 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4239 htab->plt_eh_frame->contents
4240 + PLT_FDE_START_OFFSET);
4241 }
4242 if (htab->plt_eh_frame->sec_info_type
4243 == SEC_INFO_TYPE_EH_FRAME)
4244 {
4245 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4246 htab->plt_eh_frame,
4247 htab->plt_eh_frame->contents))
4248 return FALSE;
4249 }
4250 }
4251
4252 /* Adjust .eh_frame for .plt.got section. */
4253 if (htab->plt_got_eh_frame != NULL
4254 && htab->plt_got_eh_frame->contents != NULL)
4255 {
4256 if (htab->plt_got != NULL
4257 && htab->plt_got->size != 0
4258 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
4259 && htab->plt_got->output_section != NULL
4260 && htab->plt_got_eh_frame->output_section != NULL)
4261 {
4262 bfd_vma plt_start = htab->plt_got->output_section->vma;
4263 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
4264 + htab->plt_got_eh_frame->output_offset
4265 + PLT_FDE_START_OFFSET;
4266 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4267 htab->plt_got_eh_frame->contents
4268 + PLT_FDE_START_OFFSET);
4269 }
4270 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4271 {
4272 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4273 htab->plt_got_eh_frame,
4274 htab->plt_got_eh_frame->contents))
4275 return FALSE;
4276 }
4277 }
4278
4279 /* Adjust .eh_frame for the second PLT section. */
4280 if (htab->plt_second_eh_frame != NULL
4281 && htab->plt_second_eh_frame->contents != NULL)
4282 {
4283 if (htab->plt_second != NULL
4284 && htab->plt_second->size != 0
4285 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
4286 && htab->plt_second->output_section != NULL
4287 && htab->plt_second_eh_frame->output_section != NULL)
4288 {
4289 bfd_vma plt_start = htab->plt_second->output_section->vma;
4290 bfd_vma eh_frame_start
4291 = (htab->plt_second_eh_frame->output_section->vma
4292 + htab->plt_second_eh_frame->output_offset
4293 + PLT_FDE_START_OFFSET);
4294 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4295 htab->plt_second_eh_frame->contents
4296 + PLT_FDE_START_OFFSET);
4297 }
4298 if (htab->plt_second_eh_frame->sec_info_type
4299 == SEC_INFO_TYPE_EH_FRAME)
4300 {
4301 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4302 htab->plt_second_eh_frame,
4303 htab->plt_second_eh_frame->contents))
4304 return FALSE;
4305 }
4306 }
4307
4308 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4309 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4310
4311 /* Fill PLT entries for undefined weak symbols in PIE. */
4312 if (bfd_link_pie (info))
4313 bfd_hash_traverse (&info->hash->table,
4314 elf_i386_pie_finish_undefweak_symbol,
4315 info);
4316
4317 return TRUE;
4318}
4319
4320/* Fill PLT/GOT entries and allocate dynamic relocations for local
4321 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4322 It has to be done before elf_link_sort_relocs is called so that
4323 dynamic relocations are properly sorted. */
4324
4325static bfd_boolean
4326elf_i386_output_arch_local_syms
4327 (bfd *output_bfd ATTRIBUTE_UNUSED,
4328 struct bfd_link_info *info,
4329 void *flaginfo ATTRIBUTE_UNUSED,
4330 int (*func) (void *, const char *,
4331 Elf_Internal_Sym *,
4332 asection *,
4333 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4334{
4335 struct elf_x86_link_hash_table *htab
4336 = elf_x86_hash_table (info, I386_ELF_DATA);
4337 if (htab == NULL)
4338 return FALSE;
4339
4340 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4341 htab_traverse (htab->loc_hash_table,
4342 elf_i386_finish_local_dynamic_symbol,
4343 info);
4344
4345 return TRUE;
4346}
4347
4348/* Forward declaration. */
4349static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4350
4351/* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4352 dynamic relocations. */
4353
4354static long
4355elf_i386_get_synthetic_symtab (bfd *abfd,
4356 long symcount ATTRIBUTE_UNUSED,
4357 asymbol **syms ATTRIBUTE_UNUSED,
4358 long dynsymcount,
4359 asymbol **dynsyms,
4360 asymbol **ret)
4361{
4362 long count, i, n;
4363 int j;
4364 bfd_byte *plt_contents;
4365 long relsize;
4366 const struct elf_x86_lazy_plt_layout *lazy_plt;
4367 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4368 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4369 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4370 asection *plt;
4371 bfd_vma got_addr;
4372 enum elf_x86_plt_type plt_type;
4373 struct elf_x86_plt plts[] =
4374 {
4375 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4376 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4377 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4378 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4379 };
4380
4381 *ret = NULL;
4382
4383 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4384 return 0;
4385
4386 if (dynsymcount <= 0)
4387 return 0;
4388
4389 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4390 if (relsize <= 0)
4391 return -1;
4392
4393 non_lazy_plt = NULL;
4394 /* Silence GCC 6. */
4395 lazy_plt = NULL;
4396 non_lazy_ibt_plt = NULL;
4397 lazy_ibt_plt = NULL;
4398 switch (get_elf_i386_backend_data (abfd)->os)
4399 {
4400 case is_normal:
4401 non_lazy_plt = &elf_i386_non_lazy_plt;
4402 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4403 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4404 /* Fall through */
4405 case is_vxworks:
4406 lazy_plt = &elf_i386_lazy_plt;
4407 break;
4408 case is_nacl:
4409 lazy_plt = &elf_i386_nacl_plt;
4410 break;
4411 }
4412
4413 got_addr = 0;
4414
4415 count = 0;
4416 for (j = 0; plts[j].name != NULL; j++)
4417 {
4418 plt = bfd_get_section_by_name (abfd, plts[j].name);
4419 if (plt == NULL || plt->size == 0)
4420 continue;
4421
4422 /* Get the PLT section contents. */
4423 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4424 if (plt_contents == NULL)
4425 break;
4426 if (!bfd_get_section_contents (abfd, (asection *) plt,
4427 plt_contents, 0, plt->size))
4428 {
4429 free (plt_contents);
4430 break;
4431 }
4432
4433 /* Check what kind of PLT it is. */
4434 plt_type = plt_unknown;
4435 if (plts[j].type == plt_unknown
4436 && (plt->size >= (lazy_plt->plt0_entry_size
4437 + lazy_plt->plt_entry_size)))
4438 {
4439 /* Match lazy PLT first. */
4440 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4441 lazy_plt->plt0_got1_offset) == 0)
4442 {
4443 /* The fist entry in the lazy IBT PLT is the same as the
4444 normal lazy PLT. */
4445 if (lazy_ibt_plt != NULL
4446 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4447 lazy_ibt_plt->plt_entry,
4448 lazy_ibt_plt->plt_got_offset) == 0))
4449 plt_type = plt_lazy | plt_second;
4450 else
4451 plt_type = plt_lazy;
4452 }
4453 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4454 lazy_plt->plt0_got1_offset) == 0)
4455 {
4456 /* The fist entry in the PIC lazy IBT PLT is the same as
4457 the normal PIC lazy PLT. */
4458 if (lazy_ibt_plt != NULL
4459 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4460 lazy_ibt_plt->pic_plt_entry,
4461 lazy_ibt_plt->plt_got_offset) == 0))
4462 plt_type = plt_lazy | plt_pic | plt_second;
4463 else
4464 plt_type = plt_lazy | plt_pic;
4465 }
4466 }
4467
4468 if (non_lazy_plt != NULL
4469 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4470 && plt->size >= non_lazy_plt->plt_entry_size)
4471 {
4472 /* Match non-lazy PLT. */
4473 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4474 non_lazy_plt->plt_got_offset) == 0)
4475 plt_type = plt_non_lazy;
4476 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4477 non_lazy_plt->plt_got_offset) == 0)
4478 plt_type = plt_pic;
4479 }
4480
4481 if ((non_lazy_ibt_plt != NULL)
4482 && (plt_type == plt_unknown || plt_type == plt_second)
4483 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4484 {
4485 if (memcmp (plt_contents,
4486 non_lazy_ibt_plt->plt_entry,
4487 non_lazy_ibt_plt->plt_got_offset) == 0)
4488 {
4489 /* Match IBT PLT. */
4490 plt_type = plt_second;
4491 non_lazy_plt = non_lazy_ibt_plt;
4492 }
4493 else if (memcmp (plt_contents,
4494 non_lazy_ibt_plt->pic_plt_entry,
4495 non_lazy_ibt_plt->plt_got_offset) == 0)
4496 {
4497 /* Match PIC IBT PLT. */
4498 plt_type = plt_second | plt_pic;
4499 non_lazy_plt = non_lazy_ibt_plt;
4500 }
4501 }
4502
4503 if (plt_type == plt_unknown)
4504 {
4505 free (plt_contents);
4506 continue;
4507 }
4508
4509 plts[j].sec = plt;
4510 plts[j].type = plt_type;
4511
4512 if ((plt_type & plt_lazy))
4513 {
4514 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4515 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4516 /* Skip PLT0 in lazy PLT. */
4517 i = 1;
4518 }
4519 else
4520 {
4521 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4522 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4523 i = 0;
4524 }
4525
4526 /* Skip lazy PLT when the second PLT is used. */
4527 if ((plt_type & (plt_lazy | plt_second))
4528 == (plt_lazy | plt_second))
4529 plts[j].count = 0;
4530 else
4531 {
4532 n = plt->size / plts[j].plt_entry_size;
4533 plts[j].count = n;
4534 count += n - i;
4535 }
4536
4537 plts[j].contents = plt_contents;
4538
4539 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4540 if ((plt_type & plt_pic))
4541 got_addr = (bfd_vma) -1;
4542 }
4543
4544 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4545 got_addr, plts, dynsyms,
4546 ret);
4547}
4548
4549/* Set up i386 GNU properties. Return the first relocatable ELF input
4550 with GNU properties if found. Otherwise, return NULL. */
4551
4552static bfd *
4553elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4554{
4555 struct elf_x86_init_table init_table;
4556
4557 init_table.normal_target = FALSE;
4558 init_table.is_vxworks = FALSE;
4559 switch (get_elf_i386_backend_data (info->output_bfd)->os)
4560 {
4561 case is_normal:
4562 init_table.lazy_plt = &elf_i386_lazy_plt;
4563 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4564 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4565 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4566 init_table.normal_target = TRUE;
4567 break;
4568 case is_vxworks:
4569 init_table.lazy_plt = &elf_i386_lazy_plt;
4570 init_table.non_lazy_plt = NULL;
4571 init_table.lazy_ibt_plt = NULL;
4572 init_table.non_lazy_ibt_plt = NULL;
4573 init_table.is_vxworks = TRUE;
4574 break;
4575 case is_nacl:
4576 init_table.lazy_plt = &elf_i386_nacl_plt;
4577 init_table.non_lazy_plt = NULL;
4578 init_table.lazy_ibt_plt = NULL;
4579 init_table.non_lazy_ibt_plt = NULL;
4580 break;
4581 }
4582
4583 init_table.r_info = elf32_r_info;
4584 init_table.r_sym = elf32_r_sym;
4585
4586 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4587}
4588
4589#define TARGET_LITTLE_SYM i386_elf32_vec
4590#define TARGET_LITTLE_NAME "elf32-i386"
4591#define ELF_ARCH bfd_arch_i386
4592#define ELF_TARGET_ID I386_ELF_DATA
4593#define ELF_MACHINE_CODE EM_386
4594#define ELF_MAXPAGESIZE 0x1000
4595
4596#define elf_backend_can_gc_sections 1
4597#define elf_backend_can_refcount 1
4598#define elf_backend_want_got_plt 1
4599#define elf_backend_plt_readonly 1
4600#define elf_backend_want_plt_sym 0
4601#define elf_backend_got_header_size 12
4602#define elf_backend_plt_alignment 4
4603#define elf_backend_dtrel_excludes_plt 1
4604#define elf_backend_extern_protected_data 1
4605#define elf_backend_caches_rawsize 1
4606#define elf_backend_want_dynrelro 1
4607
4608/* Support RELA for objdump of prelink objects. */
4609#define elf_info_to_howto elf_i386_info_to_howto_rel
4610#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4611
4612#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4613#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4614#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4615#define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4616
4617#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4618#define elf_backend_check_relocs elf_i386_check_relocs
4619#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4620#define elf_backend_fake_sections elf_i386_fake_sections
4621#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4622#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4623#define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4624#define elf_backend_grok_prstatus elf_i386_grok_prstatus
4625#define elf_backend_grok_psinfo elf_i386_grok_psinfo
4626#define elf_backend_reloc_type_class elf_i386_reloc_type_class
4627#define elf_backend_relocate_section elf_i386_relocate_section
4628#define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4629
4630#include "elf32-target.h"
4631
4632/* FreeBSD support. */
4633
4634#undef TARGET_LITTLE_SYM
4635#define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4636#undef TARGET_LITTLE_NAME
4637#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4638#undef ELF_OSABI
4639#define ELF_OSABI ELFOSABI_FREEBSD
4640
4641/* The kernel recognizes executables as valid only if they carry a
4642 "FreeBSD" label in the ELF header. So we put this label on all
4643 executables and (for simplicity) also all other object files. */
4644
4645static void
4646elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4647{
4648 _bfd_elf_post_process_headers (abfd, info);
4649
4650#ifdef OLD_FREEBSD_ABI_LABEL
4651 {
4652 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4653 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4654 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4655 }
4656#endif
4657}
4658
4659#undef elf_backend_post_process_headers
4660#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4661#undef elf32_bed
4662#define elf32_bed elf32_i386_fbsd_bed
4663
4664#undef elf_backend_add_symbol_hook
4665
4666#include "elf32-target.h"
4667
4668/* Solaris 2. */
4669
4670#undef TARGET_LITTLE_SYM
4671#define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4672#undef TARGET_LITTLE_NAME
4673#define TARGET_LITTLE_NAME "elf32-i386-sol2"
4674
4675#undef elf_backend_post_process_headers
4676
4677/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4678 objects won't be recognized. */
4679#undef ELF_OSABI
4680
4681#undef elf32_bed
4682#define elf32_bed elf32_i386_sol2_bed
4683
4684/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4685 boundary. */
4686#undef elf_backend_static_tls_alignment
4687#define elf_backend_static_tls_alignment 8
4688
4689/* The Solaris 2 ABI requires a plt symbol on all platforms.
4690
4691 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4692 File, p.63. */
4693#undef elf_backend_want_plt_sym
4694#define elf_backend_want_plt_sym 1
4695
4696#undef elf_backend_strtab_flags
4697#define elf_backend_strtab_flags SHF_STRINGS
4698
4699/* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4700 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4701 FALSE otherwise. ISECTION is the best guess matching section from the
4702 input bfd IBFD, but it might be NULL. */
4703
4704static bfd_boolean
4705elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4706 bfd *obfd ATTRIBUTE_UNUSED,
4707 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4708 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4709{
4710 /* PR 19938: FIXME: Need to add code for setting the sh_info
4711 and sh_link fields of Solaris specific section types. */
4712 return FALSE;
4713
4714 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4715 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4716
4717http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4718
4719 The following values should be set:
4720
4721Type Link Info
4722-----------------------------------------------------------------------------
4723SHT_SUNW_ancillary The section header index of 0
4724 [0x6fffffee] the associated string table.
4725
4726SHT_SUNW_capinfo The section header index of For a dynamic object, the
4727 [0x6ffffff0] the associated symbol table. section header index of
4728 the associated
4729 SHT_SUNW_capchain table,
4730 otherwise 0.
4731
4732SHT_SUNW_symsort The section header index of 0
4733 [0x6ffffff1] the associated symbol table.
4734
4735SHT_SUNW_tlssort The section header index of 0
4736 [0x6ffffff2] the associated symbol table.
4737
4738SHT_SUNW_LDYNSYM The section header index of One greater than the
4739 [0x6ffffff3] the associated string table. symbol table index of the
4740 This index is the same string last local symbol,
4741 table used by the SHT_DYNSYM STB_LOCAL. Since
4742 section. SHT_SUNW_LDYNSYM only
4743 contains local symbols,
4744 sh_info is equivalent to
4745 the number of symbols in
4746 the table.
4747
4748SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4749 [0x6ffffff5] the section header index of to named strings, the
4750 the associated section header index of
4751 SHT_SUNW_capinfo table, the associated string
4752 otherwise 0. table, otherwise 0.
4753
4754SHT_SUNW_move The section header index of 0
4755 [0x6ffffffa] the associated symbol table.
4756
4757SHT_SUNW_COMDAT 0 0
4758 [0x6ffffffb]
4759
4760SHT_SUNW_syminfo The section header index of The section header index
4761 [0x6ffffffc] the associated symbol table. of the associated
4762 .dynamic section.
4763
4764SHT_SUNW_verdef The section header index of The number of version
4765 [0x6ffffffd] the associated string table. definitions within the
4766 section.
4767
4768SHT_SUNW_verneed The section header index of The number of version
4769 [0x6ffffffe] the associated string table. dependencies within the
4770 section.
4771
4772SHT_SUNW_versym The section header index of 0
4773 [0x6fffffff] the associated symbol table. */
4774}
4775
4776#undef elf_backend_copy_special_section_fields
4777#define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4778
4779#include "elf32-target.h"
4780
4781/* Intel MCU support. */
4782
4783static bfd_boolean
4784elf32_iamcu_elf_object_p (bfd *abfd)
4785{
4786 /* Set the right machine number for an IAMCU elf32 file. */
4787 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4788 return TRUE;
4789}
4790
4791#undef TARGET_LITTLE_SYM
4792#define TARGET_LITTLE_SYM iamcu_elf32_vec
4793#undef TARGET_LITTLE_NAME
4794#define TARGET_LITTLE_NAME "elf32-iamcu"
4795#undef ELF_ARCH
4796#define ELF_ARCH bfd_arch_iamcu
4797
4798#undef ELF_MACHINE_CODE
4799#define ELF_MACHINE_CODE EM_IAMCU
4800
4801#undef ELF_OSABI
4802
4803#undef elf32_bed
4804#define elf32_bed elf32_iamcu_bed
4805
4806#undef elf_backend_object_p
4807#define elf_backend_object_p elf32_iamcu_elf_object_p
4808
4809#undef elf_backend_static_tls_alignment
4810
4811#undef elf_backend_want_plt_sym
4812#define elf_backend_want_plt_sym 0
4813
4814#undef elf_backend_strtab_flags
4815#undef elf_backend_copy_special_section_fields
4816
4817#include "elf32-target.h"
4818
4819/* Restore defaults. */
4820#undef ELF_ARCH
4821#define ELF_ARCH bfd_arch_i386
4822#undef ELF_MACHINE_CODE
4823#define ELF_MACHINE_CODE EM_386
4824
4825/* Native Client support. */
4826
4827#undef TARGET_LITTLE_SYM
4828#define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4829#undef TARGET_LITTLE_NAME
4830#define TARGET_LITTLE_NAME "elf32-i386-nacl"
4831#undef elf32_bed
4832#define elf32_bed elf32_i386_nacl_bed
4833
4834#undef ELF_MAXPAGESIZE
4835#define ELF_MAXPAGESIZE 0x10000
4836
4837/* Restore defaults. */
4838#undef ELF_OSABI
4839#undef elf_backend_want_plt_sym
4840#define elf_backend_want_plt_sym 0
4841#undef elf_backend_post_process_headers
4842#undef elf_backend_static_tls_alignment
4843
4844/* NaCl uses substantially different PLT entries for the same effects. */
4845
4846#undef elf_backend_plt_alignment
4847#define elf_backend_plt_alignment 5
4848#define NACL_PLT_ENTRY_SIZE 64
4849#define NACLMASK 0xe0 /* 32-byte alignment mask. */
4850
4851static const bfd_byte elf_i386_nacl_plt0_entry[] =
4852 {
4853 0xff, 0x35, /* pushl contents of address */
4854 0, 0, 0, 0, /* replaced with address of .got + 4. */
4855 0x8b, 0x0d, /* movl contents of address, %ecx */
4856 0, 0, 0, 0, /* replaced with address of .got + 8. */
4857 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4858 0xff, 0xe1 /* jmp *%ecx */
4859 };
4860
4861static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4862 {
4863 0x8b, 0x0d, /* movl contents of address, %ecx */
4864 0, 0, 0, 0, /* replaced with GOT slot address. */
4865 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4866 0xff, 0xe1, /* jmp *%ecx */
4867
4868 /* Pad to the next 32-byte boundary with nop instructions. */
4869 0x90,
4870 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4871 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4872
4873 /* Lazy GOT entries point here (32-byte aligned). */
4874 0x68, /* pushl immediate */
4875 0, 0, 0, 0, /* replaced with reloc offset. */
4876 0xe9, /* jmp relative */
4877 0, 0, 0, 0, /* replaced with offset to .plt. */
4878
4879 /* Pad to the next 32-byte boundary with nop instructions. */
4880 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4881 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4882 0x90, 0x90
4883 };
4884
4885static const bfd_byte
4886elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4887 {
4888 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4889 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4890 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4891 0xff, 0xe1, /* jmp *%ecx */
4892
4893 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4894 so pad to that size with nop instructions. */
4895 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4896 };
4897
4898static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4899 {
4900 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4901 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4902 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4903 0xff, 0xe1, /* jmp *%ecx */
4904
4905 /* Pad to the next 32-byte boundary with nop instructions. */
4906 0x90,
4907 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4908 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4909
4910 /* Lazy GOT entries point here (32-byte aligned). */
4911 0x68, /* pushl immediate */
4912 0, 0, 0, 0, /* replaced with offset into relocation table. */
4913 0xe9, /* jmp relative */
4914 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4915
4916 /* Pad to the next 32-byte boundary with nop instructions. */
4917 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4918 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4919 0x90, 0x90
4920 };
4921
4922static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4923 {
4924#if (PLT_CIE_LENGTH != 20 \
4925 || PLT_FDE_LENGTH != 36 \
4926 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4927 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4928# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
4929#endif
4930 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4931 0, 0, 0, 0, /* CIE ID */
4932 1, /* CIE version */
4933 'z', 'R', 0, /* Augmentation string */
4934 1, /* Code alignment factor */
4935 0x7c, /* Data alignment factor: -4 */
4936 8, /* Return address column */
4937 1, /* Augmentation size */
4938 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4939 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4940 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4941 DW_CFA_nop, DW_CFA_nop,
4942
4943 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4944 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4945 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4946 0, 0, 0, 0, /* .plt size goes here */
4947 0, /* Augmentation size */
4948 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4949 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4950 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4951 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4952 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4953 13, /* Block length */
4954 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4955 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4956 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4957 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4958 DW_CFA_nop, DW_CFA_nop
4959 };
4960
4961static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4962 {
4963 elf_i386_nacl_plt0_entry, /* plt0_entry */
4964 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4965 elf_i386_nacl_plt_entry, /* plt_entry */
4966 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4967 2, /* plt0_got1_offset */
4968 8, /* plt0_got2_offset */
4969 0, /* plt0_got2_insn_end */
4970 2, /* plt_got_offset */
4971 33, /* plt_reloc_offset */
4972 38, /* plt_plt_offset */
4973 0, /* plt_got_insn_size */
4974 0, /* plt_plt_insn_end */
4975 32, /* plt_lazy_offset */
4976 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4977 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4978 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4979 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4980 };
4981
4982static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
4983 {
4984 0x90, /* plt0_pad_byte: nop insn */
4985 is_nacl /* os */
4986 };
4987
4988static bfd_boolean
4989elf32_i386_nacl_elf_object_p (bfd *abfd)
4990{
4991 /* Set the right machine number for a NaCl i386 ELF32 file. */
4992 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4993 return TRUE;
4994}
4995
4996#undef elf_backend_arch_data
4997#define elf_backend_arch_data &elf_i386_nacl_arch_bed
4998
4999#undef elf_backend_object_p
5000#define elf_backend_object_p elf32_i386_nacl_elf_object_p
5001#undef elf_backend_modify_segment_map
5002#define elf_backend_modify_segment_map nacl_modify_segment_map
5003#undef elf_backend_modify_program_headers
5004#define elf_backend_modify_program_headers nacl_modify_program_headers
5005#undef elf_backend_final_write_processing
5006#define elf_backend_final_write_processing nacl_final_write_processing
5007
5008#include "elf32-target.h"
5009
5010/* Restore defaults. */
5011#undef elf_backend_object_p
5012#undef elf_backend_modify_segment_map
5013#undef elf_backend_modify_program_headers
5014#undef elf_backend_final_write_processing
5015
5016/* VxWorks support. */
5017
5018#undef TARGET_LITTLE_SYM
5019#define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5020#undef TARGET_LITTLE_NAME
5021#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5022#undef ELF_OSABI
5023#undef ELF_MAXPAGESIZE
5024#define ELF_MAXPAGESIZE 0x1000
5025#undef elf_backend_plt_alignment
5026#define elf_backend_plt_alignment 4
5027
5028static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5029 {
5030 0x90, /* plt0_pad_byte */
5031 is_vxworks /* os */
5032 };
5033
5034#undef elf_backend_arch_data
5035#define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5036
5037#undef elf_backend_relocs_compatible
5038#undef elf_backend_add_symbol_hook
5039#define elf_backend_add_symbol_hook \
5040 elf_vxworks_add_symbol_hook
5041#undef elf_backend_link_output_symbol_hook
5042#define elf_backend_link_output_symbol_hook \
5043 elf_vxworks_link_output_symbol_hook
5044#undef elf_backend_emit_relocs
5045#define elf_backend_emit_relocs elf_vxworks_emit_relocs
5046#undef elf_backend_final_write_processing
5047#define elf_backend_final_write_processing \
5048 elf_vxworks_final_write_processing
5049#undef elf_backend_static_tls_alignment
5050
5051/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5052 define it. */
5053#undef elf_backend_want_plt_sym
5054#define elf_backend_want_plt_sym 1
5055
5056#undef elf32_bed
5057#define elf32_bed elf32_i386_vxworks_bed
5058
5059#include "elf32-target.h"
GDB Binutils - Deliverables
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