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[binutils-gdb.git] / bfd / elf32-i386.c
blobc9ff0c4bbfd3678e1435e130440de196eb8eec2f
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "elfxx-x86.h"
22 #include "elf-nacl.h"
23 #include "elf-vxworks.h"
24 #include "dwarf2.h"
25 #include "opcode/i386.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
186
187 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
188
189 #ifdef DEBUG_GEN_RELOC
190 #define TRACE(str) \
191 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 #else
193 #define TRACE(str)
194 #endif
195
196 static reloc_howto_type *
197 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
198 bfd_reloc_code_real_type code)
199 {
200 switch (code)
201 {
202 case BFD_RELOC_NONE:
203 TRACE ("BFD_RELOC_NONE");
204 return &elf_howto_table[R_386_NONE];
205
206 case BFD_RELOC_32:
207 TRACE ("BFD_RELOC_32");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_CTOR:
211 TRACE ("BFD_RELOC_CTOR");
212 return &elf_howto_table[R_386_32];
213
214 case BFD_RELOC_32_PCREL:
215 TRACE ("BFD_RELOC_PC32");
216 return &elf_howto_table[R_386_PC32];
217
218 case BFD_RELOC_386_GOT32:
219 TRACE ("BFD_RELOC_386_GOT32");
220 return &elf_howto_table[R_386_GOT32];
221
222 case BFD_RELOC_386_PLT32:
223 TRACE ("BFD_RELOC_386_PLT32");
224 return &elf_howto_table[R_386_PLT32];
225
226 case BFD_RELOC_386_COPY:
227 TRACE ("BFD_RELOC_386_COPY");
228 return &elf_howto_table[R_386_COPY];
229
230 case BFD_RELOC_386_GLOB_DAT:
231 TRACE ("BFD_RELOC_386_GLOB_DAT");
232 return &elf_howto_table[R_386_GLOB_DAT];
233
234 case BFD_RELOC_386_JUMP_SLOT:
235 TRACE ("BFD_RELOC_386_JUMP_SLOT");
236 return &elf_howto_table[R_386_JUMP_SLOT];
237
238 case BFD_RELOC_386_RELATIVE:
239 TRACE ("BFD_RELOC_386_RELATIVE");
240 return &elf_howto_table[R_386_RELATIVE];
241
242 case BFD_RELOC_386_GOTOFF:
243 TRACE ("BFD_RELOC_386_GOTOFF");
244 return &elf_howto_table[R_386_GOTOFF];
245
246 case BFD_RELOC_386_GOTPC:
247 TRACE ("BFD_RELOC_386_GOTPC");
248 return &elf_howto_table[R_386_GOTPC];
249
250 /* These relocs are a GNU extension. */
251 case BFD_RELOC_386_TLS_TPOFF:
252 TRACE ("BFD_RELOC_386_TLS_TPOFF");
253 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_IE:
256 TRACE ("BFD_RELOC_386_TLS_IE");
257 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_GOTIE:
260 TRACE ("BFD_RELOC_386_TLS_GOTIE");
261 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_LE:
264 TRACE ("BFD_RELOC_386_TLS_LE");
265 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_GD:
268 TRACE ("BFD_RELOC_386_TLS_GD");
269 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
270
271 case BFD_RELOC_386_TLS_LDM:
272 TRACE ("BFD_RELOC_386_TLS_LDM");
273 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
274
275 case BFD_RELOC_16:
276 TRACE ("BFD_RELOC_16");
277 return &elf_howto_table[R_386_16 - R_386_ext_offset];
278
279 case BFD_RELOC_16_PCREL:
280 TRACE ("BFD_RELOC_16_PCREL");
281 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
282
283 case BFD_RELOC_8:
284 TRACE ("BFD_RELOC_8");
285 return &elf_howto_table[R_386_8 - R_386_ext_offset];
286
287 case BFD_RELOC_8_PCREL:
288 TRACE ("BFD_RELOC_8_PCREL");
289 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
290
291 /* Common with Sun TLS implementation. */
292 case BFD_RELOC_386_TLS_LDO_32:
293 TRACE ("BFD_RELOC_386_TLS_LDO_32");
294 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_IE_32:
297 TRACE ("BFD_RELOC_386_TLS_IE_32");
298 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_LE_32:
301 TRACE ("BFD_RELOC_386_TLS_LE_32");
302 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPMOD32:
305 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
306 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_DTPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
310 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_TPOFF32:
313 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
314 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
315
316 case BFD_RELOC_SIZE32:
317 TRACE ("BFD_RELOC_SIZE32");
318 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_GOTDESC:
321 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
322 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_TLS_DESC_CALL:
325 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
326 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
327
328 case BFD_RELOC_386_TLS_DESC:
329 TRACE ("BFD_RELOC_386_TLS_DESC");
330 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
331
332 case BFD_RELOC_386_IRELATIVE:
333 TRACE ("BFD_RELOC_386_IRELATIVE");
334 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
335
336 case BFD_RELOC_386_GOT32X:
337 TRACE ("BFD_RELOC_386_GOT32X");
338 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
339
340 case BFD_RELOC_VTABLE_INHERIT:
341 TRACE ("BFD_RELOC_VTABLE_INHERIT");
342 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
343
344 case BFD_RELOC_VTABLE_ENTRY:
345 TRACE ("BFD_RELOC_VTABLE_ENTRY");
346 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
347
348 default:
349 break;
350 }
351
352 TRACE ("Unknown");
353 return 0;
354 }
355
356 static reloc_howto_type *
357 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
358 const char *r_name)
359 {
360 unsigned int i;
361
362 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
363 if (elf_howto_table[i].name != NULL
364 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
365 return &elf_howto_table[i];
366
367 return NULL;
368 }
369
370 static reloc_howto_type *
371 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
372 {
373 unsigned int indx;
374
375 if ((indx = r_type) >= R_386_standard
376 && ((indx = r_type - R_386_ext_offset) - R_386_standard
377 >= R_386_ext - R_386_standard)
378 && ((indx = r_type - R_386_tls_offset) - R_386_ext
379 >= R_386_ext2 - R_386_ext)
380 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
381 >= R_386_vt - R_386_ext2))
382 {
383 /* xgettext:c-format */
384 _bfd_error_handler (_("%B: invalid relocation type %d"),
385 abfd, (int) r_type);
386 indx = R_386_NONE;
387 }
388 /* PR 17512: file: 0f67f69d. */
389 if (elf_howto_table [indx].type != r_type)
390 return NULL;
391 return &elf_howto_table[indx];
392 }
393
394 static void
395 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
396 arelent *cache_ptr,
397 Elf_Internal_Rela *dst)
398 {
399 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
400 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
401 }
402
403 /* Return whether a symbol name implies a local label. The UnixWare
404 2.1 cc generates temporary symbols that start with .X, so we
405 recognize them here. FIXME: do other SVR4 compilers also use .X?.
406 If so, we should move the .X recognition into
407 _bfd_elf_is_local_label_name. */
408
409 static bfd_boolean
410 elf_i386_is_local_label_name (bfd *abfd, const char *name)
411 {
412 if (name[0] == '.' && name[1] == 'X')
413 return TRUE;
414
415 return _bfd_elf_is_local_label_name (abfd, name);
416 }
417 \f
418 /* Support for core dump NOTE sections. */
419
420 static bfd_boolean
421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
422 {
423 int offset;
424 size_t size;
425
426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
427 {
428 int pr_version = bfd_get_32 (abfd, note->descdata);
429
430 if (pr_version != 1)
431 return FALSE;
432
433 /* pr_cursig */
434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
435
436 /* pr_pid */
437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
438
439 /* pr_reg */
440 offset = 28;
441 size = bfd_get_32 (abfd, note->descdata + 8);
442 }
443 else
444 {
445 switch (note->descsz)
446 {
447 default:
448 return FALSE;
449
450 case 144: /* Linux/i386 */
451 /* pr_cursig */
452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
453
454 /* pr_pid */
455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
456
457 /* pr_reg */
458 offset = 72;
459 size = 68;
460
461 break;
462 }
463 }
464
465 /* Make a ".reg/999" section. */
466 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
467 size, note->descpos + offset);
468 }
469
470 static bfd_boolean
471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
472 {
473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
474 {
475 int pr_version = bfd_get_32 (abfd, note->descdata);
476
477 if (pr_version != 1)
478 return FALSE;
479
480 elf_tdata (abfd)->core->program
481 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
482 elf_tdata (abfd)->core->command
483 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
484 }
485 else
486 {
487 switch (note->descsz)
488 {
489 default:
490 return FALSE;
491
492 case 124: /* Linux/i386 elf_prpsinfo. */
493 elf_tdata (abfd)->core->pid
494 = bfd_get_32 (abfd, note->descdata + 12);
495 elf_tdata (abfd)->core->program
496 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
497 elf_tdata (abfd)->core->command
498 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
499 }
500 }
501
502 /* Note that for some reason, a spurious space is tacked
503 onto the end of the args in some (at least one anyway)
504 implementations, so strip it off if it exists. */
505 {
506 char *command = elf_tdata (abfd)->core->command;
507 int n = strlen (command);
508
509 if (0 < n && command[n - 1] == ' ')
510 command[n - 1] = '\0';
511 }
512
513 return TRUE;
514 }
515 \f
516 /* Functions for the i386 ELF linker.
517
518 In order to gain some understanding of code in this file without
519 knowing all the intricate details of the linker, note the
520 following:
521
522 Functions named elf_i386_* are called by external routines, other
523 functions are only called locally. elf_i386_* functions appear
524 in this file more or less in the order in which they are called
525 from external routines. eg. elf_i386_check_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
528
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
530
531 #define LAZY_PLT_ENTRY_SIZE 16
532
533 /* The size in bytes of an entry in the non-lazy procedure linkage
534 table. */
535
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
537
538 /* The first entry in an absolute lazy procedure linkage table looks
539 like this. See the SVR4 ABI i386 supplement to see how this works.
540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
541
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
543 {
544 0xff, 0x35, /* pushl contents of address */
545 0, 0, 0, 0, /* replaced with address of .got + 4. */
546 0xff, 0x25, /* jmp indirect */
547 0, 0, 0, 0 /* replaced with address of .got + 8. */
548 };
549
550 /* Subsequent entries in an absolute lazy procedure linkage table look
551 like this. */
552
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
557 0x68, /* pushl immediate */
558 0, 0, 0, 0, /* replaced with offset into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt. */
561 };
562
563 /* The first entry in a PIC lazy procedure linkage table look like
564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
565 lazy_plt->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
574 this. */
575
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
577 {
578 0xff, 0xa3, /* jmp *offset(%ebx) */
579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
580 0x68, /* pushl immediate */
581 0, 0, 0, 0, /* replaced with offset into relocation table. */
582 0xe9, /* jmp relative */
583 0, 0, 0, 0 /* replaced with offset to start of .plt. */
584 };
585
586 /* Entries in the non-lazy procedure linkage table look like this. */
587
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
589 {
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
593 };
594
595 /* Entries in the PIC non-lazy procedure linkage table look like
596 this. */
597
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
599 {
600 0xff, 0xa3, /* jmp *offset(%ebx) */
601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
602 0x66, 0x90 /* xchg %ax,%ax */
603 };
604
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
607
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
609 {
610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
613 };
614
615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
616 table look like this. Subsequent entries for a PIC IBT-enabled lazy
617 procedure linkage table are the same. */
618
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
620 {
621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
622 0x68, 0, 0, 0, 0, /* pushl immediate */
623 0xe9, 0, 0, 0, 0, /* jmp relative */
624 0x66, 0x90 /* xchg %ax,%ax */
625 };
626
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
628 look like. */
629
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
631 {
632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
635 };
636
637 /* Entries for branches with IBT-enabled in the absolute non-lazey
638 procedure linkage table look like this. They have the same size
639 as the lazy PLT entry. */
640
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
642 {
643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 };
647
648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
649 linkage table look like this. They have the same size as the lazy
650 PLT entry. */
651
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
653 {
654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
657 };
658
659 /* .eh_frame covering the lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
662 {
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
665 1, /* CIE version */
666 'z', 'R', 0, /* Augmentation string */
667 1, /* Code alignment factor */
668 0x7c, /* Data alignment factor */
669 8, /* Return address column */
670 1, /* Augmentation size */
671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
674 DW_CFA_nop, DW_CFA_nop,
675
676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
679 0, 0, 0, 0, /* .plt size goes here */
680 0, /* Augmentation size */
681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
686 11, /* Block length */
687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
690 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
692 };
693
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
695
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
697 {
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
700 1, /* CIE version */
701 'z', 'R', 0, /* Augmentation string */
702 1, /* Code alignment factor */
703 0x7c, /* Data alignment factor */
704 8, /* Return address column */
705 1, /* Augmentation size */
706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
709 DW_CFA_nop, DW_CFA_nop,
710
711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
714 0, 0, 0, 0, /* .plt size goes here */
715 0, /* Augmentation size */
716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
721 11, /* Block length */
722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
727 };
728
729 /* .eh_frame covering the non-lazy .plt section. */
730
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
732 {
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
736 1, /* CIE version */
737 'z', 'R', 0, /* Augmentation string */
738 1, /* Code alignment factor */
739 0x7c, /* Data alignment factor */
740 8, /* Return address column */
741 1, /* Augmentation size */
742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
745 DW_CFA_nop, DW_CFA_nop,
746
747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
750 0, 0, 0, 0, /* non-lazy .plt size goes here */
751 0, /* Augmentation size */
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
757 {
758 elf_i386_lazy_plt0_entry, /* plt0_entry */
759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
760 elf_i386_lazy_plt_entry, /* plt_entry */
761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
762 2, /* plt0_got1_offset */
763 8, /* plt0_got2_offset */
764 0, /* plt0_got2_insn_end */
765 2, /* plt_got_offset */
766 7, /* plt_reloc_offset */
767 12, /* plt_plt_offset */
768 0, /* plt_got_insn_size */
769 0, /* plt_plt_insn_end */
770 6, /* plt_lazy_offset */
771 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
772 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
773 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
774 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
775 };
776
777 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
778 {
779 elf_i386_non_lazy_plt_entry, /* plt_entry */
780 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
781 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
782 2, /* plt_got_offset */
783 0, /* plt_got_insn_size */
784 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
785 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
786 };
787
788 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
789 {
790 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
791 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
792 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
793 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
794 2, /* plt0_got1_offset */
795 8, /* plt0_got2_offset */
796 0, /* plt0_got2_insn_end */
797 4+2, /* plt_got_offset */
798 4+1, /* plt_reloc_offset */
799 4+6, /* plt_plt_offset */
800 0, /* plt_got_insn_size */
801 0, /* plt_plt_insn_end */
802 0, /* plt_lazy_offset */
803 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
804 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
805 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
806 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
807 };
808
809 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
810 {
811 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
812 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
813 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
814 4+2, /* plt_got_offset */
815 0, /* plt_got_insn_size */
816 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
817 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
818 };
819 \f
820
821 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
822 for the PLTResolve stub and then for each PLT entry. */
823 #define PLTRESOLVE_RELOCS_SHLIB 0
824 #define PLTRESOLVE_RELOCS 2
825 #define PLT_NON_JUMP_SLOT_RELOCS 2
826
827 /* These are the standard parameters. */
828 static const struct elf_x86_backend_data elf_i386_arch_bed =
829 {
830 is_normal /* os */
831 };
832
833 #define elf_backend_arch_data &elf_i386_arch_bed
834
835 /* Return TRUE if the TLS access code sequence support transition
836 from R_TYPE. */
837
838 static bfd_boolean
839 elf_i386_check_tls_transition (asection *sec,
840 bfd_byte *contents,
841 Elf_Internal_Shdr *symtab_hdr,
842 struct elf_link_hash_entry **sym_hashes,
843 unsigned int r_type,
844 const Elf_Internal_Rela *rel,
845 const Elf_Internal_Rela *relend)
846 {
847 unsigned int val, type, reg;
848 unsigned long r_symndx;
849 struct elf_link_hash_entry *h;
850 bfd_vma offset;
851 bfd_byte *call;
852 bfd_boolean indirect_call;
853
854 offset = rel->r_offset;
855 switch (r_type)
856 {
857 case R_386_TLS_GD:
858 case R_386_TLS_LDM:
859 if (offset < 2 || (rel + 1) >= relend)
860 return FALSE;
861
862 indirect_call = FALSE;
863 call = contents + offset + 4;
864 val = *(call - 5);
865 type = *(call - 6);
866 if (r_type == R_386_TLS_GD)
867 {
868 /* Check transition from GD access model. Only
869 leal foo@tlsgd(,%ebx,1), %eax
870 call ___tls_get_addr@PLT
871 or
872 leal foo@tlsgd(%ebx) %eax
873 call ___tls_get_addr@PLT
874 nop
875 or
876 leal foo@tlsgd(%reg), %eax
877 call *___tls_get_addr@GOT(%reg)
878 which may be converted to
879 addr32 call ___tls_get_addr
880 can transit to different access model. */
881 if ((offset + 10) > sec->size
882 || (type != 0x8d && type != 0x04))
883 return FALSE;
884
885 if (type == 0x04)
886 {
887 /* leal foo@tlsgd(,%ebx,1), %eax
888 call ___tls_get_addr@PLT */
889 if (offset < 3)
890 return FALSE;
891
892 if (*(call - 7) != 0x8d
893 || val != 0x1d
894 || call[0] != 0xe8)
895 return FALSE;
896 }
897 else
898 {
899 /* This must be
900 leal foo@tlsgd(%ebx), %eax
901 call ___tls_get_addr@PLT
902 nop
903 or
904 leal foo@tlsgd(%reg), %eax
905 call *___tls_get_addr@GOT(%reg)
906 which may be converted to
907 addr32 call ___tls_get_addr
908
909 %eax can't be used as the GOT base register since it
910 is used to pass parameter to ___tls_get_addr. */
911 reg = val & 7;
912 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
913 return FALSE;
914
915 indirect_call = call[0] == 0xff;
916 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
917 && !(call[0] == 0x67 && call[1] == 0xe8)
918 && !(indirect_call
919 && (call[1] & 0xf8) == 0x90
920 && (call[1] & 0x7) == reg))
921 return FALSE;
922 }
923 }
924 else
925 {
926 /* Check transition from LD access model. Only
927 leal foo@tlsldm(%ebx), %eax
928 call ___tls_get_addr@PLT
929 or
930 leal foo@tlsldm(%reg), %eax
931 call *___tls_get_addr@GOT(%reg)
932 which may be converted to
933 addr32 call ___tls_get_addr
934 can transit to different access model. */
935 if (type != 0x8d || (offset + 9) > sec->size)
936 return FALSE;
937
938 /* %eax can't be used as the GOT base register since it is
939 used to pass parameter to ___tls_get_addr. */
940 reg = val & 7;
941 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
942 return FALSE;
943
944 indirect_call = call[0] == 0xff;
945 if (!(reg == 3 && call[0] == 0xe8)
946 && !(call[0] == 0x67 && call[1] == 0xe8)
947 && !(indirect_call
948 && (call[1] & 0xf8) == 0x90
949 && (call[1] & 0x7) == reg))
950 return FALSE;
951 }
952
953 r_symndx = ELF32_R_SYM (rel[1].r_info);
954 if (r_symndx < symtab_hdr->sh_info)
955 return FALSE;
956
957 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
958 if (h == NULL
959 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
960 return FALSE;
961 else if (indirect_call)
962 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
963 else
964 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
965 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
966
967 case R_386_TLS_IE:
968 /* Check transition from IE access model:
969 movl foo@indntpoff(%rip), %eax
970 movl foo@indntpoff(%rip), %reg
971 addl foo@indntpoff(%rip), %reg
972 */
973
974 if (offset < 1 || (offset + 4) > sec->size)
975 return FALSE;
976
977 /* Check "movl foo@tpoff(%rip), %eax" first. */
978 val = bfd_get_8 (abfd, contents + offset - 1);
979 if (val == 0xa1)
980 return TRUE;
981
982 if (offset < 2)
983 return FALSE;
984
985 /* Check movl|addl foo@tpoff(%rip), %reg. */
986 type = bfd_get_8 (abfd, contents + offset - 2);
987 return ((type == 0x8b || type == 0x03)
988 && (val & 0xc7) == 0x05);
989
990 case R_386_TLS_GOTIE:
991 case R_386_TLS_IE_32:
992 /* Check transition from {IE_32,GOTIE} access model:
993 subl foo@{tpoff,gontoff}(%reg1), %reg2
994 movl foo@{tpoff,gontoff}(%reg1), %reg2
995 addl foo@{tpoff,gontoff}(%reg1), %reg2
996 */
997
998 if (offset < 2 || (offset + 4) > sec->size)
999 return FALSE;
1000
1001 val = bfd_get_8 (abfd, contents + offset - 1);
1002 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1003 return FALSE;
1004
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return type == 0x8b || type == 0x2b || type == 0x03;
1007
1008 case R_386_TLS_GOTDESC:
1009 /* Check transition from GDesc access model:
1010 leal x@tlsdesc(%ebx), %eax
1011
1012 Make sure it's a leal adding ebx to a 32-bit offset
1013 into any register, although it's probably almost always
1014 going to be eax. */
1015
1016 if (offset < 2 || (offset + 4) > sec->size)
1017 return FALSE;
1018
1019 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1020 return FALSE;
1021
1022 val = bfd_get_8 (abfd, contents + offset - 1);
1023 return (val & 0xc7) == 0x83;
1024
1025 case R_386_TLS_DESC_CALL:
1026 /* Check transition from GDesc access model:
1027 call *x@tlsdesc(%eax)
1028 */
1029 if (offset + 2 <= sec->size)
1030 {
1031 /* Make sure that it's a call *x@tlsdesc(%eax). */
1032 call = contents + offset;
1033 return call[0] == 0xff && call[1] == 0x10;
1034 }
1035
1036 return FALSE;
1037
1038 default:
1039 abort ();
1040 }
1041 }
1042
1043 /* Return TRUE if the TLS access transition is OK or no transition
1044 will be performed. Update R_TYPE if there is a transition. */
1045
1046 static bfd_boolean
1047 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1048 asection *sec, bfd_byte *contents,
1049 Elf_Internal_Shdr *symtab_hdr,
1050 struct elf_link_hash_entry **sym_hashes,
1051 unsigned int *r_type, int tls_type,
1052 const Elf_Internal_Rela *rel,
1053 const Elf_Internal_Rela *relend,
1054 struct elf_link_hash_entry *h,
1055 unsigned long r_symndx,
1056 bfd_boolean from_relocate_section)
1057 {
1058 unsigned int from_type = *r_type;
1059 unsigned int to_type = from_type;
1060 bfd_boolean check = TRUE;
1061
1062 /* Skip TLS transition for functions. */
1063 if (h != NULL
1064 && (h->type == STT_FUNC
1065 || h->type == STT_GNU_IFUNC))
1066 return TRUE;
1067
1068 switch (from_type)
1069 {
1070 case R_386_TLS_GD:
1071 case R_386_TLS_GOTDESC:
1072 case R_386_TLS_DESC_CALL:
1073 case R_386_TLS_IE_32:
1074 case R_386_TLS_IE:
1075 case R_386_TLS_GOTIE:
1076 if (bfd_link_executable (info))
1077 {
1078 if (h == NULL)
1079 to_type = R_386_TLS_LE_32;
1080 else if (from_type != R_386_TLS_IE
1081 && from_type != R_386_TLS_GOTIE)
1082 to_type = R_386_TLS_IE_32;
1083 }
1084
1085 /* When we are called from elf_i386_relocate_section, there may
1086 be additional transitions based on TLS_TYPE. */
1087 if (from_relocate_section)
1088 {
1089 unsigned int new_to_type = to_type;
1090
1091 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1092 new_to_type = R_386_TLS_LE_32;
1093
1094 if (to_type == R_386_TLS_GD
1095 || to_type == R_386_TLS_GOTDESC
1096 || to_type == R_386_TLS_DESC_CALL)
1097 {
1098 if (tls_type == GOT_TLS_IE_POS)
1099 new_to_type = R_386_TLS_GOTIE;
1100 else if (tls_type & GOT_TLS_IE)
1101 new_to_type = R_386_TLS_IE_32;
1102 }
1103
1104 /* We checked the transition before when we were called from
1105 elf_i386_check_relocs. We only want to check the new
1106 transition which hasn't been checked before. */
1107 check = new_to_type != to_type && from_type == to_type;
1108 to_type = new_to_type;
1109 }
1110
1111 break;
1112
1113 case R_386_TLS_LDM:
1114 if (bfd_link_executable (info))
1115 to_type = R_386_TLS_LE_32;
1116 break;
1117
1118 default:
1119 return TRUE;
1120 }
1121
1122 /* Return TRUE if there is no transition. */
1123 if (from_type == to_type)
1124 return TRUE;
1125
1126 /* Check if the transition can be performed. */
1127 if (check
1128 && ! elf_i386_check_tls_transition (sec, contents,
1129 symtab_hdr, sym_hashes,
1130 from_type, rel, relend))
1131 {
1132 reloc_howto_type *from, *to;
1133 const char *name;
1134
1135 from = elf_i386_rtype_to_howto (abfd, from_type);
1136 to = elf_i386_rtype_to_howto (abfd, to_type);
1137
1138 if (h)
1139 name = h->root.root.string;
1140 else
1141 {
1142 struct elf_x86_link_hash_table *htab;
1143
1144 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1145 if (htab == NULL)
1146 name = "*unknown*";
1147 else
1148 {
1149 Elf_Internal_Sym *isym;
1150
1151 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1152 abfd, r_symndx);
1153 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1154 }
1155 }
1156
1157 _bfd_error_handler
1158 /* xgettext:c-format */
1159 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1160 "in section `%A' failed"),
1161 abfd, from->name, to->name, name,
1162 rel->r_offset, sec);
1163 bfd_set_error (bfd_error_bad_value);
1164 return FALSE;
1165 }
1166
1167 *r_type = to_type;
1168 return TRUE;
1169 }
1170
1171 /* With the local symbol, foo, we convert
1172 mov foo@GOT[(%reg1)], %reg2
1173 to
1174 lea foo[@GOTOFF(%reg1)], %reg2
1175 and convert
1176 call/jmp *foo@GOT[(%reg)]
1177 to
1178 nop call foo/jmp foo nop
1179 When PIC is false, convert
1180 test %reg1, foo@GOT[(%reg2)]
1181 to
1182 test $foo, %reg1
1183 and convert
1184 binop foo@GOT[(%reg1)], %reg2
1185 to
1186 binop $foo, %reg2
1187 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1188 instructions. */
1189
1190 static
1191 bfd_boolean
1192 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1193 bfd_byte *contents,
1194 unsigned int *r_type_p,
1195 Elf_Internal_Rela *irel,
1196 struct elf_link_hash_entry *h,
1197 bfd_boolean *converted,
1198 struct bfd_link_info *link_info)
1199 {
1200 struct elf_x86_link_hash_table *htab;
1201 unsigned int opcode;
1202 unsigned int modrm;
1203 bfd_boolean baseless;
1204 Elf_Internal_Sym *isym;
1205 unsigned int addend;
1206 unsigned int nop;
1207 bfd_vma nop_offset;
1208 bfd_boolean is_pic;
1209 bfd_boolean to_reloc_32;
1210 unsigned int r_type;
1211 unsigned int r_symndx;
1212 bfd_vma roff = irel->r_offset;
1213 bfd_boolean local_ref;
1214 struct elf_x86_link_hash_entry *eh;
1215
1216 if (roff < 2)
1217 return TRUE;
1218
1219 /* Addend for R_386_GOT32X relocations must be 0. */
1220 addend = bfd_get_32 (abfd, contents + roff);
1221 if (addend != 0)
1222 return TRUE;
1223
1224 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1225 is_pic = bfd_link_pic (link_info);
1226
1227 r_type = *r_type_p;
1228 r_symndx = ELF32_R_SYM (irel->r_info);
1229
1230 modrm = bfd_get_8 (abfd, contents + roff - 1);
1231 baseless = (modrm & 0xc7) == 0x5;
1232
1233 if (baseless && is_pic)
1234 {
1235 /* For PIC, disallow R_386_GOT32X without a base register
1236 since we don't know what the GOT base is. */
1237 const char *name;
1238
1239 if (h == NULL)
1240 {
1241 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1242 r_symndx);
1243 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1244 }
1245 else
1246 name = h->root.root.string;
1247
1248 _bfd_error_handler
1249 /* xgettext:c-format */
1250 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1251 " register can not be used when making a shared object"),
1252 abfd, name);
1253 return FALSE;
1254 }
1255
1256 opcode = bfd_get_8 (abfd, contents + roff - 2);
1257
1258 /* Convert to R_386_32 if PIC is false or there is no base
1259 register. */
1260 to_reloc_32 = !is_pic || baseless;
1261
1262 eh = elf_x86_hash_entry (h);
1263
1264 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1265 reloc. */
1266 if (h == NULL)
1267 {
1268 if (opcode == 0x0ff)
1269 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1270 goto convert_branch;
1271 else
1272 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1273 "test %reg1, foo@GOT(%reg2)" and
1274 "binop foo@GOT[(%reg1)], %reg2". */
1275 goto convert_load;
1276 }
1277
1278 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1279 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1280
1281 /* Undefined weak symbol is only bound locally in executable
1282 and its reference is resolved as 0. */
1283 if (h->root.type == bfd_link_hash_undefweak
1284 && !eh->linker_def
1285 && local_ref)
1286 {
1287 if (opcode == 0xff)
1288 {
1289 /* No direct branch to 0 for PIC. */
1290 if (is_pic)
1291 return TRUE;
1292 else
1293 goto convert_branch;
1294 }
1295 else
1296 {
1297 /* We can convert load of address 0 to R_386_32. */
1298 to_reloc_32 = TRUE;
1299 goto convert_load;
1300 }
1301 }
1302
1303 if (opcode == 0xff)
1304 {
1305 /* We have "call/jmp *foo@GOT[(%reg)]". */
1306 if ((h->root.type == bfd_link_hash_defined
1307 || h->root.type == bfd_link_hash_defweak)
1308 && local_ref)
1309 {
1310 /* The function is locally defined. */
1311 convert_branch:
1312 /* Convert R_386_GOT32X to R_386_PC32. */
1313 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1314 {
1315 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1316 is a nop prefix. */
1317 modrm = 0xe8;
1318 /* To support TLS optimization, always use addr32 prefix
1319 for "call *___tls_get_addr@GOT(%reg)". */
1320 if (eh && eh->tls_get_addr)
1321 {
1322 nop = 0x67;
1323 nop_offset = irel->r_offset - 2;
1324 }
1325 else
1326 {
1327 nop = link_info->call_nop_byte;
1328 if (link_info->call_nop_as_suffix)
1329 {
1330 nop_offset = roff + 3;
1331 irel->r_offset -= 1;
1332 }
1333 else
1334 nop_offset = roff - 2;
1335 }
1336 }
1337 else
1338 {
1339 /* Convert to "jmp foo nop". */
1340 modrm = 0xe9;
1341 nop = NOP_OPCODE;
1342 nop_offset = roff + 3;
1343 irel->r_offset -= 1;
1344 }
1345
1346 bfd_put_8 (abfd, nop, contents + nop_offset);
1347 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1348 /* When converting to PC-relative relocation, we
1349 need to adjust addend by -4. */
1350 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1351 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1352 *r_type_p = R_386_PC32;
1353 *converted = TRUE;
1354 }
1355 }
1356 else
1357 {
1358 /* We have "mov foo@GOT[(%re1g)], %reg2",
1359 "test %reg1, foo@GOT(%reg2)" and
1360 "binop foo@GOT[(%reg1)], %reg2".
1361
1362 Avoid optimizing _DYNAMIC since ld.so may use its
1363 link-time address. */
1364 if (h == htab->elf.hdynamic)
1365 return TRUE;
1366
1367 /* def_regular is set by an assignment in a linker script in
1368 bfd_elf_record_link_assignment. start_stop is set on
1369 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1370 if (h->start_stop
1371 || eh->linker_def
1372 || ((h->def_regular
1373 || h->root.type == bfd_link_hash_defined
1374 || h->root.type == bfd_link_hash_defweak)
1375 && local_ref))
1376 {
1377 convert_load:
1378 if (opcode == 0x8b)
1379 {
1380 if (to_reloc_32)
1381 {
1382 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1383 "mov $foo, %reg2" with R_386_32. */
1384 r_type = R_386_32;
1385 modrm = 0xc0 | (modrm & 0x38) >> 3;
1386 bfd_put_8 (abfd, modrm, contents + roff - 1);
1387 opcode = 0xc7;
1388 }
1389 else
1390 {
1391 /* Convert "mov foo@GOT(%reg1), %reg2" to
1392 "lea foo@GOTOFF(%reg1), %reg2". */
1393 r_type = R_386_GOTOFF;
1394 opcode = 0x8d;
1395 }
1396 }
1397 else
1398 {
1399 /* Only R_386_32 is supported. */
1400 if (!to_reloc_32)
1401 return TRUE;
1402
1403 if (opcode == 0x85)
1404 {
1405 /* Convert "test %reg1, foo@GOT(%reg2)" to
1406 "test $foo, %reg1". */
1407 modrm = 0xc0 | (modrm & 0x38) >> 3;
1408 opcode = 0xf7;
1409 }
1410 else
1411 {
1412 /* Convert "binop foo@GOT(%reg1), %reg2" to
1413 "binop $foo, %reg2". */
1414 modrm = (0xc0
1415 | (modrm & 0x38) >> 3
1416 | (opcode & 0x3c));
1417 opcode = 0x81;
1418 }
1419 bfd_put_8 (abfd, modrm, contents + roff - 1);
1420 r_type = R_386_32;
1421 }
1422
1423 bfd_put_8 (abfd, opcode, contents + roff - 2);
1424 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1425 *r_type_p = r_type;
1426 *converted = TRUE;
1427 }
1428 }
1429
1430 return TRUE;
1431 }
1432
1433 /* Rename some of the generic section flags to better document how they
1434 are used here. */
1435 #define check_relocs_failed sec_flg0
1436
1437 /* Look through the relocs for a section during the first phase, and
1438 calculate needed space in the global offset table, procedure linkage
1439 table, and dynamic reloc sections. */
1440
1441 static bfd_boolean
1442 elf_i386_check_relocs (bfd *abfd,
1443 struct bfd_link_info *info,
1444 asection *sec,
1445 const Elf_Internal_Rela *relocs)
1446 {
1447 struct elf_x86_link_hash_table *htab;
1448 Elf_Internal_Shdr *symtab_hdr;
1449 struct elf_link_hash_entry **sym_hashes;
1450 const Elf_Internal_Rela *rel;
1451 const Elf_Internal_Rela *rel_end;
1452 asection *sreloc;
1453 bfd_byte *contents;
1454 bfd_boolean converted;
1455
1456 if (bfd_link_relocatable (info))
1457 return TRUE;
1458
1459 /* Don't do anything special with non-loaded, non-alloced sections.
1460 In particular, any relocs in such sections should not affect GOT
1461 and PLT reference counting (ie. we don't allow them to create GOT
1462 or PLT entries), there's no possibility or desire to optimize TLS
1463 relocs, and there's not much point in propagating relocs to shared
1464 libs that the dynamic linker won't relocate. */
1465 if ((sec->flags & SEC_ALLOC) == 0)
1466 return TRUE;
1467
1468 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1469 if (htab == NULL)
1470 {
1471 sec->check_relocs_failed = 1;
1472 return FALSE;
1473 }
1474
1475 BFD_ASSERT (is_x86_elf (abfd, htab));
1476
1477 /* Get the section contents. */
1478 if (elf_section_data (sec)->this_hdr.contents != NULL)
1479 contents = elf_section_data (sec)->this_hdr.contents;
1480 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1481 {
1482 sec->check_relocs_failed = 1;
1483 return FALSE;
1484 }
1485
1486 symtab_hdr = &elf_symtab_hdr (abfd);
1487 sym_hashes = elf_sym_hashes (abfd);
1488
1489 converted = FALSE;
1490
1491 sreloc = NULL;
1492
1493 rel_end = relocs + sec->reloc_count;
1494 for (rel = relocs; rel < rel_end; rel++)
1495 {
1496 unsigned int r_type;
1497 unsigned int r_symndx;
1498 struct elf_link_hash_entry *h;
1499 struct elf_x86_link_hash_entry *eh;
1500 Elf_Internal_Sym *isym;
1501 const char *name;
1502 bfd_boolean size_reloc;
1503
1504 r_symndx = ELF32_R_SYM (rel->r_info);
1505 r_type = ELF32_R_TYPE (rel->r_info);
1506
1507 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1508 {
1509 /* xgettext:c-format */
1510 _bfd_error_handler (_("%B: bad symbol index: %d"),
1511 abfd, r_symndx);
1512 goto error_return;
1513 }
1514
1515 if (r_symndx < symtab_hdr->sh_info)
1516 {
1517 /* A local symbol. */
1518 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1519 abfd, r_symndx);
1520 if (isym == NULL)
1521 goto error_return;
1522
1523 /* Check relocation against local STT_GNU_IFUNC symbol. */
1524 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1525 {
1526 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1527 if (h == NULL)
1528 goto error_return;
1529
1530 /* Fake a STT_GNU_IFUNC symbol. */
1531 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1532 isym, NULL);
1533 h->type = STT_GNU_IFUNC;
1534 h->def_regular = 1;
1535 h->ref_regular = 1;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1538 }
1539 else
1540 h = NULL;
1541 }
1542 else
1543 {
1544 isym = NULL;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1549 }
1550
1551 eh = (struct elf_x86_link_hash_entry *) h;
1552 if (h != NULL)
1553 {
1554 if (r_type == R_386_GOTOFF)
1555 eh->gotoff_ref = 1;
1556
1557 /* It is referenced by a non-shared object. */
1558 h->ref_regular = 1;
1559 h->root.non_ir_ref_regular = 1;
1560
1561 if (h->type == STT_GNU_IFUNC)
1562 elf_tdata (info->output_bfd)->has_gnu_symbols
1563 |= elf_gnu_symbol_ifunc;
1564 }
1565
1566 if (r_type == R_386_GOT32X
1567 && (h == NULL || h->type != STT_GNU_IFUNC))
1568 {
1569 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1570 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1571 &r_type, irel, h,
1572 &converted, info))
1573 goto error_return;
1574 }
1575
1576 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1577 symtab_hdr, sym_hashes,
1578 &r_type, GOT_UNKNOWN,
1579 rel, rel_end, h, r_symndx, FALSE))
1580 goto error_return;
1581
1582 switch (r_type)
1583 {
1584 case R_386_TLS_LDM:
1585 htab->tls_ld_or_ldm_got.refcount = 1;
1586 goto create_got;
1587
1588 case R_386_PLT32:
1589 /* This symbol requires a procedure linkage table entry. We
1590 actually build the entry in adjust_dynamic_symbol,
1591 because this might be a case of linking PIC code which is
1592 never referenced by a dynamic object, in which case we
1593 don't need to generate a procedure linkage table entry
1594 after all. */
1595
1596 /* If this is a local symbol, we resolve it directly without
1597 creating a procedure linkage table entry. */
1598 if (h == NULL)
1599 continue;
1600
1601 eh->zero_undefweak &= 0x2;
1602 h->needs_plt = 1;
1603 h->plt.refcount = 1;
1604 break;
1605
1606 case R_386_SIZE32:
1607 size_reloc = TRUE;
1608 goto do_size;
1609
1610 case R_386_TLS_IE_32:
1611 case R_386_TLS_IE:
1612 case R_386_TLS_GOTIE:
1613 if (!bfd_link_executable (info))
1614 info->flags |= DF_STATIC_TLS;
1615 /* Fall through */
1616
1617 case R_386_GOT32:
1618 case R_386_GOT32X:
1619 case R_386_TLS_GD:
1620 case R_386_TLS_GOTDESC:
1621 case R_386_TLS_DESC_CALL:
1622 /* This symbol requires a global offset table entry. */
1623 {
1624 int tls_type, old_tls_type;
1625
1626 switch (r_type)
1627 {
1628 default:
1629 case R_386_GOT32:
1630 case R_386_GOT32X:
1631 tls_type = GOT_NORMAL;
1632 break;
1633 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1634 case R_386_TLS_GOTDESC:
1635 case R_386_TLS_DESC_CALL:
1636 tls_type = GOT_TLS_GDESC; break;
1637 case R_386_TLS_IE_32:
1638 if (ELF32_R_TYPE (rel->r_info) == r_type)
1639 tls_type = GOT_TLS_IE_NEG;
1640 else
1641 /* If this is a GD->IE transition, we may use either of
1642 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1643 tls_type = GOT_TLS_IE;
1644 break;
1645 case R_386_TLS_IE:
1646 case R_386_TLS_GOTIE:
1647 tls_type = GOT_TLS_IE_POS; break;
1648 }
1649
1650 if (h != NULL)
1651 {
1652 h->got.refcount = 1;
1653 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1654 }
1655 else
1656 {
1657 bfd_signed_vma *local_got_refcounts;
1658
1659 /* This is a global offset table entry for a local symbol. */
1660 local_got_refcounts = elf_local_got_refcounts (abfd);
1661 if (local_got_refcounts == NULL)
1662 {
1663 bfd_size_type size;
1664
1665 size = symtab_hdr->sh_info;
1666 size *= (sizeof (bfd_signed_vma)
1667 + sizeof (bfd_vma) + sizeof(char));
1668 local_got_refcounts = (bfd_signed_vma *)
1669 bfd_zalloc (abfd, size);
1670 if (local_got_refcounts == NULL)
1671 goto error_return;
1672 elf_local_got_refcounts (abfd) = local_got_refcounts;
1673 elf_x86_local_tlsdesc_gotent (abfd)
1674 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1675 elf_x86_local_got_tls_type (abfd)
1676 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1677 }
1678 local_got_refcounts[r_symndx] = 1;
1679 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1680 }
1681
1682 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1683 tls_type |= old_tls_type;
1684 /* If a TLS symbol is accessed using IE at least once,
1685 there is no point to use dynamic model for it. */
1686 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1687 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1688 || (tls_type & GOT_TLS_IE) == 0))
1689 {
1690 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1691 tls_type = old_tls_type;
1692 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1693 && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type |= old_tls_type;
1695 else
1696 {
1697 if (h)
1698 name = h->root.root.string;
1699 else
1700 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1701 NULL);
1702 _bfd_error_handler
1703 /* xgettext:c-format */
1704 (_("%B: `%s' accessed both as normal and "
1705 "thread local symbol"),
1706 abfd, name);
1707 bfd_set_error (bfd_error_bad_value);
1708 goto error_return;
1709 }
1710 }
1711
1712 if (old_tls_type != tls_type)
1713 {
1714 if (h != NULL)
1715 elf_x86_hash_entry (h)->tls_type = tls_type;
1716 else
1717 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1718 }
1719 }
1720 /* Fall through */
1721
1722 case R_386_GOTOFF:
1723 case R_386_GOTPC:
1724 create_got:
1725 if (r_type != R_386_TLS_IE)
1726 {
1727 if (eh != NULL)
1728 eh->zero_undefweak &= 0x2;
1729 break;
1730 }
1731 /* Fall through */
1732
1733 case R_386_TLS_LE_32:
1734 case R_386_TLS_LE:
1735 if (eh != NULL)
1736 eh->zero_undefweak &= 0x2;
1737 if (bfd_link_executable (info))
1738 break;
1739 info->flags |= DF_STATIC_TLS;
1740 goto do_relocation;
1741
1742 case R_386_32:
1743 case R_386_PC32:
1744 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1745 eh->zero_undefweak |= 0x2;
1746 do_relocation:
1747 /* We are called after all symbols have been resolved. Only
1748 relocation against STT_GNU_IFUNC symbol must go through
1749 PLT. */
1750 if (h != NULL
1751 && (bfd_link_executable (info)
1752 || h->type == STT_GNU_IFUNC))
1753 {
1754 bfd_boolean func_pointer_ref = FALSE;
1755
1756 if (r_type == R_386_PC32)
1757 {
1758 /* Since something like ".long foo - ." may be used
1759 as pointer, make sure that PLT is used if foo is
1760 a function defined in a shared library. */
1761 if ((sec->flags & SEC_CODE) == 0)
1762 h->pointer_equality_needed = 1;
1763 else if (h->type == STT_GNU_IFUNC
1764 && bfd_link_pic (info))
1765 {
1766 _bfd_error_handler
1767 /* xgettext:c-format */
1768 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
1769 abfd, h->root.root.string);
1770 bfd_set_error (bfd_error_bad_value);
1771 goto error_return;
1772 }
1773 }
1774 else
1775 {
1776 h->pointer_equality_needed = 1;
1777 /* R_386_32 can be resolved at run-time. */
1778 if (r_type == R_386_32
1779 && (sec->flags & SEC_READONLY) == 0)
1780 func_pointer_ref = TRUE;
1781 }
1782
1783 if (!func_pointer_ref)
1784 {
1785 /* If this reloc is in a read-only section, we might
1786 need a copy reloc. We can't check reliably at this
1787 stage whether the section is read-only, as input
1788 sections have not yet been mapped to output sections.
1789 Tentatively set the flag for now, and correct in
1790 adjust_dynamic_symbol. */
1791 h->non_got_ref = 1;
1792
1793 /* We may need a .plt entry if the symbol is a function
1794 defined in a shared lib or is a function referenced
1795 from the code or read-only section. */
1796 if (!h->def_regular
1797 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1798 h->plt.refcount = 1;
1799 }
1800 }
1801
1802 size_reloc = FALSE;
1803 do_size:
1804 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
1805 R_386_32))
1806 {
1807 struct elf_dyn_relocs *p;
1808 struct elf_dyn_relocs **head;
1809
1810 /* We must copy these reloc types into the output file.
1811 Create a reloc section in dynobj and make room for
1812 this reloc. */
1813 if (sreloc == NULL)
1814 {
1815 sreloc = _bfd_elf_make_dynamic_reloc_section
1816 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1817
1818 if (sreloc == NULL)
1819 goto error_return;
1820 }
1821
1822 /* If this is a global symbol, we count the number of
1823 relocations we need for this symbol. */
1824 if (h != NULL)
1825 {
1826 head = &eh->dyn_relocs;
1827 }
1828 else
1829 {
1830 /* Track dynamic relocs needed for local syms too.
1831 We really need local syms available to do this
1832 easily. Oh well. */
1833 void **vpp;
1834 asection *s;
1835
1836 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1837 abfd, r_symndx);
1838 if (isym == NULL)
1839 goto error_return;
1840
1841 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1842 if (s == NULL)
1843 s = sec;
1844
1845 vpp = &elf_section_data (s)->local_dynrel;
1846 head = (struct elf_dyn_relocs **)vpp;
1847 }
1848
1849 p = *head;
1850 if (p == NULL || p->sec != sec)
1851 {
1852 bfd_size_type amt = sizeof *p;
1853 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1854 amt);
1855 if (p == NULL)
1856 goto error_return;
1857 p->next = *head;
1858 *head = p;
1859 p->sec = sec;
1860 p->count = 0;
1861 p->pc_count = 0;
1862 }
1863
1864 p->count += 1;
1865 /* Count size relocation as PC-relative relocation. */
1866 if (r_type == R_386_PC32 || size_reloc)
1867 p->pc_count += 1;
1868 }
1869 break;
1870
1871 /* This relocation describes the C++ object vtable hierarchy.
1872 Reconstruct it for later use during GC. */
1873 case R_386_GNU_VTINHERIT:
1874 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1875 goto error_return;
1876 break;
1877
1878 /* This relocation describes which C++ vtable entries are actually
1879 used. Record for later use during GC. */
1880 case R_386_GNU_VTENTRY:
1881 BFD_ASSERT (h != NULL);
1882 if (h != NULL
1883 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1884 goto error_return;
1885 break;
1886
1887 default:
1888 break;
1889 }
1890 }
1891
1892 if (elf_section_data (sec)->this_hdr.contents != contents)
1893 {
1894 if (!converted && !info->keep_memory)
1895 free (contents);
1896 else
1897 {
1898 /* Cache the section contents for elf_link_input_bfd if any
1899 load is converted or --no-keep-memory isn't used. */
1900 elf_section_data (sec)->this_hdr.contents = contents;
1901 }
1902 }
1903
1904 /* Cache relocations if any load is converted. */
1905 if (elf_section_data (sec)->relocs != relocs && converted)
1906 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1907
1908 return TRUE;
1909
1910 error_return:
1911 if (elf_section_data (sec)->this_hdr.contents != contents)
1912 free (contents);
1913 sec->check_relocs_failed = 1;
1914 return FALSE;
1915 }
1916
1917 /* Set the correct type for an x86 ELF section. We do this by the
1918 section name, which is a hack, but ought to work. */
1919
1920 static bfd_boolean
1921 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1922 Elf_Internal_Shdr *hdr,
1923 asection *sec)
1924 {
1925 const char *name;
1926
1927 name = bfd_get_section_name (abfd, sec);
1928
1929 /* This is an ugly, but unfortunately necessary hack that is
1930 needed when producing EFI binaries on x86. It tells
1931 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1932 containing ELF relocation info. We need this hack in order to
1933 be able to generate ELF binaries that can be translated into
1934 EFI applications (which are essentially COFF objects). Those
1935 files contain a COFF ".reloc" section inside an ELFNN object,
1936 which would normally cause BFD to segfault because it would
1937 attempt to interpret this section as containing relocation
1938 entries for section "oc". With this hack enabled, ".reloc"
1939 will be treated as a normal data section, which will avoid the
1940 segfault. However, you won't be able to create an ELFNN binary
1941 with a section named "oc" that needs relocations, but that's
1942 the kind of ugly side-effects you get when detecting section
1943 types based on their names... In practice, this limitation is
1944 unlikely to bite. */
1945 if (strcmp (name, ".reloc") == 0)
1946 hdr->sh_type = SHT_PROGBITS;
1947
1948 return TRUE;
1949 }
1950
1951 /* Return the relocation value for @tpoff relocation
1952 if STT_TLS virtual address is ADDRESS. */
1953
1954 static bfd_vma
1955 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1956 {
1957 struct elf_link_hash_table *htab = elf_hash_table (info);
1958 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1959 bfd_vma static_tls_size;
1960
1961 /* If tls_sec is NULL, we should have signalled an error already. */
1962 if (htab->tls_sec == NULL)
1963 return 0;
1964
1965 /* Consider special static TLS alignment requirements. */
1966 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1967 return static_tls_size + htab->tls_sec->vma - address;
1968 }
1969
1970 /* Relocate an i386 ELF section. */
1971
1972 static bfd_boolean
1973 elf_i386_relocate_section (bfd *output_bfd,
1974 struct bfd_link_info *info,
1975 bfd *input_bfd,
1976 asection *input_section,
1977 bfd_byte *contents,
1978 Elf_Internal_Rela *relocs,
1979 Elf_Internal_Sym *local_syms,
1980 asection **local_sections)
1981 {
1982 struct elf_x86_link_hash_table *htab;
1983 Elf_Internal_Shdr *symtab_hdr;
1984 struct elf_link_hash_entry **sym_hashes;
1985 bfd_vma *local_got_offsets;
1986 bfd_vma *local_tlsdesc_gotents;
1987 Elf_Internal_Rela *rel;
1988 Elf_Internal_Rela *wrel;
1989 Elf_Internal_Rela *relend;
1990 bfd_boolean is_vxworks_tls;
1991 unsigned plt_entry_size;
1992
1993 /* Skip if check_relocs failed. */
1994 if (input_section->check_relocs_failed)
1995 return FALSE;
1996
1997 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1998 if (htab == NULL)
1999 return FALSE;
2000
2001 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2002
2003 symtab_hdr = &elf_symtab_hdr (input_bfd);
2004 sym_hashes = elf_sym_hashes (input_bfd);
2005 local_got_offsets = elf_local_got_offsets (input_bfd);
2006 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2007 /* We have to handle relocations in vxworks .tls_vars sections
2008 specially, because the dynamic loader is 'weird'. */
2009 is_vxworks_tls = (htab->target_os == is_vxworks
2010 && bfd_link_pic (info)
2011 && !strcmp (input_section->output_section->name,
2012 ".tls_vars"));
2013
2014 _bfd_x86_elf_set_tls_module_base (info);
2015
2016 plt_entry_size = htab->plt.plt_entry_size;
2017
2018 rel = wrel = relocs;
2019 relend = relocs + input_section->reloc_count;
2020 for (; rel < relend; wrel++, rel++)
2021 {
2022 unsigned int r_type, r_type_tls;
2023 reloc_howto_type *howto;
2024 unsigned long r_symndx;
2025 struct elf_link_hash_entry *h;
2026 struct elf_x86_link_hash_entry *eh;
2027 Elf_Internal_Sym *sym;
2028 asection *sec;
2029 bfd_vma off, offplt, plt_offset;
2030 bfd_vma relocation;
2031 bfd_boolean unresolved_reloc;
2032 bfd_reloc_status_type r;
2033 unsigned int indx;
2034 int tls_type;
2035 bfd_vma st_size;
2036 asection *resolved_plt;
2037 bfd_boolean resolved_to_zero;
2038 bfd_boolean relative_reloc;
2039
2040 r_type = ELF32_R_TYPE (rel->r_info);
2041 if (r_type == R_386_GNU_VTINHERIT
2042 || r_type == R_386_GNU_VTENTRY)
2043 {
2044 if (wrel != rel)
2045 *wrel = *rel;
2046 continue;
2047 }
2048
2049 if ((indx = r_type) >= R_386_standard
2050 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2051 >= R_386_ext - R_386_standard)
2052 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2053 >= R_386_ext2 - R_386_ext))
2054 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2055
2056 howto = elf_howto_table + indx;
2057
2058 r_symndx = ELF32_R_SYM (rel->r_info);
2059 h = NULL;
2060 sym = NULL;
2061 sec = NULL;
2062 unresolved_reloc = FALSE;
2063 if (r_symndx < symtab_hdr->sh_info)
2064 {
2065 sym = local_syms + r_symndx;
2066 sec = local_sections[r_symndx];
2067 relocation = (sec->output_section->vma
2068 + sec->output_offset
2069 + sym->st_value);
2070 st_size = sym->st_size;
2071
2072 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2073 && ((sec->flags & SEC_MERGE) != 0
2074 || (bfd_link_relocatable (info)
2075 && sec->output_offset != 0)))
2076 {
2077 bfd_vma addend;
2078 bfd_byte *where = contents + rel->r_offset;
2079
2080 switch (howto->size)
2081 {
2082 case 0:
2083 addend = bfd_get_8 (input_bfd, where);
2084 if (howto->pc_relative)
2085 {
2086 addend = (addend ^ 0x80) - 0x80;
2087 addend += 1;
2088 }
2089 break;
2090 case 1:
2091 addend = bfd_get_16 (input_bfd, where);
2092 if (howto->pc_relative)
2093 {
2094 addend = (addend ^ 0x8000) - 0x8000;
2095 addend += 2;
2096 }
2097 break;
2098 case 2:
2099 addend = bfd_get_32 (input_bfd, where);
2100 if (howto->pc_relative)
2101 {
2102 addend = (addend ^ 0x80000000) - 0x80000000;
2103 addend += 4;
2104 }
2105 break;
2106 default:
2107 abort ();
2108 }
2109
2110 if (bfd_link_relocatable (info))
2111 addend += sec->output_offset;
2112 else
2113 {
2114 asection *msec = sec;
2115 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2116 addend);
2117 addend -= relocation;
2118 addend += msec->output_section->vma + msec->output_offset;
2119 }
2120
2121 switch (howto->size)
2122 {
2123 case 0:
2124 /* FIXME: overflow checks. */
2125 if (howto->pc_relative)
2126 addend -= 1;
2127 bfd_put_8 (input_bfd, addend, where);
2128 break;
2129 case 1:
2130 if (howto->pc_relative)
2131 addend -= 2;
2132 bfd_put_16 (input_bfd, addend, where);
2133 break;
2134 case 2:
2135 if (howto->pc_relative)
2136 addend -= 4;
2137 bfd_put_32 (input_bfd, addend, where);
2138 break;
2139 }
2140 }
2141 else if (!bfd_link_relocatable (info)
2142 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2143 {
2144 /* Relocate against local STT_GNU_IFUNC symbol. */
2145 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2146 FALSE);
2147 if (h == NULL)
2148 abort ();
2149
2150 /* Set STT_GNU_IFUNC symbol value. */
2151 h->root.u.def.value = sym->st_value;
2152 h->root.u.def.section = sec;
2153 }
2154 }
2155 else
2156 {
2157 bfd_boolean warned ATTRIBUTE_UNUSED;
2158 bfd_boolean ignored ATTRIBUTE_UNUSED;
2159
2160 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2161 r_symndx, symtab_hdr, sym_hashes,
2162 h, sec, relocation,
2163 unresolved_reloc, warned, ignored);
2164 st_size = h->size;
2165 }
2166
2167 if (sec != NULL && discarded_section (sec))
2168 {
2169 _bfd_clear_contents (howto, input_bfd, input_section,
2170 contents + rel->r_offset);
2171 wrel->r_offset = rel->r_offset;
2172 wrel->r_info = 0;
2173 wrel->r_addend = 0;
2174
2175 /* For ld -r, remove relocations in debug sections against
2176 sections defined in discarded sections. Not done for
2177 eh_frame editing code expects to be present. */
2178 if (bfd_link_relocatable (info)
2179 && (input_section->flags & SEC_DEBUGGING))
2180 wrel--;
2181
2182 continue;
2183 }
2184
2185 if (bfd_link_relocatable (info))
2186 {
2187 if (wrel != rel)
2188 *wrel = *rel;
2189 continue;
2190 }
2191
2192 eh = (struct elf_x86_link_hash_entry *) h;
2193
2194 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2195 it here if it is defined in a non-shared object. */
2196 if (h != NULL
2197 && h->type == STT_GNU_IFUNC
2198 && h->def_regular)
2199 {
2200 asection *gotplt, *base_got;
2201 bfd_vma plt_index;
2202 const char *name;
2203
2204 if ((input_section->flags & SEC_ALLOC) == 0)
2205 {
2206 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2207 sections because such sections are not SEC_ALLOC and
2208 thus ld.so will not process them. */
2209 if ((input_section->flags & SEC_DEBUGGING) != 0)
2210 continue;
2211 abort ();
2212 }
2213
2214 /* STT_GNU_IFUNC symbol must go through PLT. */
2215 if (htab->elf.splt != NULL)
2216 {
2217 if (htab->plt_second != NULL)
2218 {
2219 resolved_plt = htab->plt_second;
2220 plt_offset = eh->plt_second.offset;
2221 }
2222 else
2223 {
2224 resolved_plt = htab->elf.splt;
2225 plt_offset = h->plt.offset;
2226 }
2227 gotplt = htab->elf.sgotplt;
2228 }
2229 else
2230 {
2231 resolved_plt = htab->elf.iplt;
2232 plt_offset = h->plt.offset;
2233 gotplt = htab->elf.igotplt;
2234 }
2235
2236 switch (r_type)
2237 {
2238 default:
2239 break;
2240
2241 case R_386_GOT32:
2242 case R_386_GOT32X:
2243 base_got = htab->elf.sgot;
2244 off = h->got.offset;
2245
2246 if (base_got == NULL)
2247 abort ();
2248
2249 if (off == (bfd_vma) -1)
2250 {
2251 /* We can't use h->got.offset here to save state, or
2252 even just remember the offset, as finish_dynamic_symbol
2253 would use that as offset into .got. */
2254
2255 if (h->plt.offset == (bfd_vma) -1)
2256 abort ();
2257
2258 if (htab->elf.splt != NULL)
2259 {
2260 plt_index = (h->plt.offset / plt_entry_size
2261 - htab->plt.has_plt0);
2262 off = (plt_index + 3) * 4;
2263 base_got = htab->elf.sgotplt;
2264 }
2265 else
2266 {
2267 plt_index = h->plt.offset / plt_entry_size;
2268 off = plt_index * 4;
2269 base_got = htab->elf.igotplt;
2270 }
2271
2272 if (h->dynindx == -1
2273 || h->forced_local
2274 || info->symbolic)
2275 {
2276 /* This references the local defitionion. We must
2277 initialize this entry in the global offset table.
2278 Since the offset must always be a multiple of 8,
2279 we use the least significant bit to record
2280 whether we have initialized it already.
2281
2282 When doing a dynamic link, we create a .rela.got
2283 relocation entry to initialize the value. This
2284 is done in the finish_dynamic_symbol routine. */
2285 if ((off & 1) != 0)
2286 off &= ~1;
2287 else
2288 {
2289 bfd_put_32 (output_bfd, relocation,
2290 base_got->contents + off);
2291 h->got.offset |= 1;
2292 }
2293 }
2294
2295 relocation = off;
2296 }
2297 else
2298 relocation = (base_got->output_section->vma
2299 + base_got->output_offset + off
2300 - gotplt->output_section->vma
2301 - gotplt->output_offset);
2302
2303 if (rel->r_offset > 1
2304 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2305 && *(contents + rel->r_offset - 2) != 0x8d)
2306 {
2307 if (bfd_link_pic (info))
2308 goto disallow_got32;
2309
2310 /* Add the GOT base if there is no base register. */
2311 relocation += (gotplt->output_section->vma
2312 + gotplt->output_offset);
2313 }
2314 else if (htab->elf.splt == NULL)
2315 {
2316 /* Adjust for static executables. */
2317 relocation += gotplt->output_offset;
2318 }
2319
2320 goto do_relocation;
2321 }
2322
2323 if (h->plt.offset == (bfd_vma) -1)
2324 {
2325 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2326 if (r_type == R_386_32
2327 && (input_section->flags & SEC_CODE) == 0)
2328 goto do_ifunc_pointer;
2329 goto bad_ifunc_reloc;
2330 }
2331
2332 relocation = (resolved_plt->output_section->vma
2333 + resolved_plt->output_offset + plt_offset);
2334
2335 switch (r_type)
2336 {
2337 default:
2338 bad_ifunc_reloc:
2339 if (h->root.root.string)
2340 name = h->root.root.string;
2341 else
2342 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2343 NULL);
2344 _bfd_error_handler
2345 /* xgettext:c-format */
2346 (_("%B: relocation %s against STT_GNU_IFUNC "
2347 "symbol `%s' isn't supported"), input_bfd,
2348 howto->name, name);
2349 bfd_set_error (bfd_error_bad_value);
2350 return FALSE;
2351
2352 case R_386_32:
2353 /* Generate dynamic relcoation only when there is a
2354 non-GOT reference in a shared object. */
2355 if ((bfd_link_pic (info) && h->non_got_ref)
2356 || h->plt.offset == (bfd_vma) -1)
2357 {
2358 Elf_Internal_Rela outrel;
2359 asection *sreloc;
2360 bfd_vma offset;
2361
2362 do_ifunc_pointer:
2363 /* Need a dynamic relocation to get the real function
2364 adddress. */
2365 offset = _bfd_elf_section_offset (output_bfd,
2366 info,
2367 input_section,
2368 rel->r_offset);
2369 if (offset == (bfd_vma) -1
2370 || offset == (bfd_vma) -2)
2371 abort ();
2372
2373 outrel.r_offset = (input_section->output_section->vma
2374 + input_section->output_offset
2375 + offset);
2376
2377 if (POINTER_LOCAL_IFUNC_P (info, h))
2378 {
2379 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2380 h->root.root.string,
2381 h->root.u.def.section->owner);
2382
2383 /* This symbol is resolved locally. */
2384 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2385 bfd_put_32 (output_bfd,
2386 (h->root.u.def.value
2387 + h->root.u.def.section->output_section->vma
2388 + h->root.u.def.section->output_offset),
2389 contents + offset);
2390 }
2391 else
2392 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2393
2394 /* Dynamic relocations are stored in
2395 1. .rel.ifunc section in PIC object.
2396 2. .rel.got section in dynamic executable.
2397 3. .rel.iplt section in static executable. */
2398 if (bfd_link_pic (info))
2399 sreloc = htab->elf.irelifunc;
2400 else if (htab->elf.splt != NULL)
2401 sreloc = htab->elf.srelgot;
2402 else
2403 sreloc = htab->elf.irelplt;
2404 elf_append_rel (output_bfd, sreloc, &outrel);
2405
2406 /* If this reloc is against an external symbol, we
2407 do not want to fiddle with the addend. Otherwise,
2408 we need to include the symbol value so that it
2409 becomes an addend for the dynamic reloc. For an
2410 internal symbol, we have updated addend. */
2411 continue;
2412 }
2413 /* FALLTHROUGH */
2414 case R_386_PC32:
2415 case R_386_PLT32:
2416 goto do_relocation;
2417
2418 case R_386_GOTOFF:
2419 relocation -= (gotplt->output_section->vma
2420 + gotplt->output_offset);
2421 goto do_relocation;
2422 }
2423 }
2424
2425 resolved_to_zero = (eh != NULL
2426 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2427
2428 switch (r_type)
2429 {
2430 case R_386_GOT32X:
2431 /* Avoid optimizing _DYNAMIC since ld.so may use its
2432 link-time address. */
2433 if (h == htab->elf.hdynamic)
2434 goto r_386_got32;
2435
2436 if (bfd_link_pic (info))
2437 {
2438 /* It is OK to convert mov to lea and convert indirect
2439 branch to direct branch. It is OK to convert adc,
2440 add, and, cmp, or, sbb, sub, test, xor only when PIC
2441 is false. */
2442 unsigned int opcode, addend;
2443 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2444 if (addend != 0)
2445 goto r_386_got32;
2446 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2447 if (opcode != 0x8b && opcode != 0xff)
2448 goto r_386_got32;
2449 }
2450
2451 /* Resolve "mov GOT[(%reg)], %reg",
2452 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2453 and "binop foo@GOT[(%reg)], %reg". */
2454 if (h == NULL
2455 || (h->plt.offset == (bfd_vma) -1
2456 && h->got.offset == (bfd_vma) -1)
2457 || htab->elf.sgotplt == NULL)
2458 abort ();
2459
2460 offplt = (htab->elf.sgotplt->output_section->vma
2461 + htab->elf.sgotplt->output_offset);
2462
2463 /* It is relative to .got.plt section. */
2464 if (h->got.offset != (bfd_vma) -1)
2465 /* Use GOT entry. Mask off the least significant bit in
2466 GOT offset which may be set by R_386_GOT32 processing
2467 below. */
2468 relocation = (htab->elf.sgot->output_section->vma
2469 + htab->elf.sgot->output_offset
2470 + (h->got.offset & ~1) - offplt);
2471 else
2472 /* Use GOTPLT entry. */
2473 relocation = (h->plt.offset / plt_entry_size
2474 - htab->plt.has_plt0 + 3) * 4;
2475
2476 if (!bfd_link_pic (info))
2477 {
2478 /* If not PIC, add the .got.plt section address for
2479 baseless addressing. */
2480 unsigned int modrm;
2481 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2482 if ((modrm & 0xc7) == 0x5)
2483 relocation += offplt;
2484 }
2485
2486 unresolved_reloc = FALSE;
2487 break;
2488
2489 case R_386_GOT32:
2490 r_386_got32:
2491 /* Relocation is to the entry for this symbol in the global
2492 offset table. */
2493 if (htab->elf.sgot == NULL)
2494 abort ();
2495
2496 relative_reloc = FALSE;
2497 if (h != NULL)
2498 {
2499 off = h->got.offset;
2500 if (RESOLVED_LOCALLY_P (info, h, htab))
2501 {
2502 /* We must initialize this entry in the global offset
2503 table. Since the offset must always be a multiple
2504 of 4, we use the least significant bit to record
2505 whether we have initialized it already.
2506
2507 When doing a dynamic link, we create a .rel.got
2508 relocation entry to initialize the value. This
2509 is done in the finish_dynamic_symbol routine. */
2510 if ((off & 1) != 0)
2511 off &= ~1;
2512 else
2513 {
2514 bfd_put_32 (output_bfd, relocation,
2515 htab->elf.sgot->contents + off);
2516 h->got.offset |= 1;
2517
2518 if (GENERATE_RELATIVE_RELOC_P (info, h))
2519 {
2520 /* PR ld/21402: If this symbol isn't dynamic
2521 in PIC, generate R_386_RELATIVE here. */
2522 eh->no_finish_dynamic_symbol = 1;
2523 relative_reloc = TRUE;
2524 }
2525 }
2526 }
2527 else
2528 unresolved_reloc = FALSE;
2529 }
2530 else
2531 {
2532 if (local_got_offsets == NULL)
2533 abort ();
2534
2535 off = local_got_offsets[r_symndx];
2536
2537 /* The offset must always be a multiple of 4. We use
2538 the least significant bit to record whether we have
2539 already generated the necessary reloc. */
2540 if ((off & 1) != 0)
2541 off &= ~1;
2542 else
2543 {
2544 bfd_put_32 (output_bfd, relocation,
2545 htab->elf.sgot->contents + off);
2546 local_got_offsets[r_symndx] |= 1;
2547
2548 if (bfd_link_pic (info))
2549 relative_reloc = TRUE;
2550 }
2551 }
2552
2553 if (relative_reloc)
2554 {
2555 asection *s;
2556 Elf_Internal_Rela outrel;
2557
2558 s = htab->elf.srelgot;
2559 if (s == NULL)
2560 abort ();
2561
2562 outrel.r_offset = (htab->elf.sgot->output_section->vma
2563 + htab->elf.sgot->output_offset
2564 + off);
2565 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2566 elf_append_rel (output_bfd, s, &outrel);
2567 }
2568
2569 if (off >= (bfd_vma) -2)
2570 abort ();
2571
2572 relocation = (htab->elf.sgot->output_section->vma
2573 + htab->elf.sgot->output_offset + off);
2574 if (rel->r_offset > 1
2575 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2576 && *(contents + rel->r_offset - 2) != 0x8d)
2577 {
2578 if (bfd_link_pic (info))
2579 {
2580 /* For PIC, disallow R_386_GOT32 without a base
2581 register, except for "lea foo@GOT, %reg", since
2582 we don't know what the GOT base is. */
2583 const char *name;
2584
2585 disallow_got32:
2586 if (h == NULL || h->root.root.string == NULL)
2587 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2588 NULL);
2589 else
2590 name = h->root.root.string;
2591
2592 _bfd_error_handler
2593 /* xgettext:c-format */
2594 (_("%B: direct GOT relocation %s against `%s'"
2595 " without base register can not be used"
2596 " when making a shared object"),
2597 input_bfd, howto->name, name);
2598 bfd_set_error (bfd_error_bad_value);
2599 return FALSE;
2600 }
2601 }
2602 else
2603 {
2604 /* Subtract the .got.plt section address only with a base
2605 register. */
2606 relocation -= (htab->elf.sgotplt->output_section->vma
2607 + htab->elf.sgotplt->output_offset);
2608 }
2609
2610 break;
2611
2612 case R_386_GOTOFF:
2613 /* Relocation is relative to the start of the global offset
2614 table. */
2615
2616 /* Check to make sure it isn't a protected function or data
2617 symbol for shared library since it may not be local when
2618 used as function address or with copy relocation. We also
2619 need to make sure that a symbol is referenced locally. */
2620 if (!bfd_link_executable (info) && h)
2621 {
2622 if (!h->def_regular)
2623 {
2624 const char *v;
2625
2626 switch (ELF_ST_VISIBILITY (h->other))
2627 {
2628 case STV_HIDDEN:
2629 v = _("hidden symbol");
2630 break;
2631 case STV_INTERNAL:
2632 v = _("internal symbol");
2633 break;
2634 case STV_PROTECTED:
2635 v = _("protected symbol");
2636 break;
2637 default:
2638 v = _("symbol");
2639 break;
2640 }
2641
2642 _bfd_error_handler
2643 /* xgettext:c-format */
2644 (_("%B: relocation R_386_GOTOFF against undefined %s"
2645 " `%s' can not be used when making a shared object"),
2646 input_bfd, v, h->root.root.string);
2647 bfd_set_error (bfd_error_bad_value);
2648 return FALSE;
2649 }
2650 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2651 && (h->type == STT_FUNC
2652 || h->type == STT_OBJECT)
2653 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2654 {
2655 _bfd_error_handler
2656 /* xgettext:c-format */
2657 (_("%B: relocation R_386_GOTOFF against protected %s"
2658 " `%s' can not be used when making a shared object"),
2659 input_bfd,
2660 h->type == STT_FUNC ? "function" : "data",
2661 h->root.root.string);
2662 bfd_set_error (bfd_error_bad_value);
2663 return FALSE;
2664 }
2665 }
2666
2667 /* Note that sgot is not involved in this
2668 calculation. We always want the start of .got.plt. If we
2669 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2670 permitted by the ABI, we might have to change this
2671 calculation. */
2672 relocation -= htab->elf.sgotplt->output_section->vma
2673 + htab->elf.sgotplt->output_offset;
2674 break;
2675
2676 case R_386_GOTPC:
2677 /* Use global offset table as symbol value. */
2678 relocation = htab->elf.sgotplt->output_section->vma
2679 + htab->elf.sgotplt->output_offset;
2680 unresolved_reloc = FALSE;
2681 break;
2682
2683 case R_386_PLT32:
2684 /* Relocation is to the entry for this symbol in the
2685 procedure linkage table. */
2686
2687 /* Resolve a PLT32 reloc against a local symbol directly,
2688 without using the procedure linkage table. */
2689 if (h == NULL)
2690 break;
2691
2692 if ((h->plt.offset == (bfd_vma) -1
2693 && eh->plt_got.offset == (bfd_vma) -1)
2694 || htab->elf.splt == NULL)
2695 {
2696 /* We didn't make a PLT entry for this symbol. This
2697 happens when statically linking PIC code, or when
2698 using -Bsymbolic. */
2699 break;
2700 }
2701
2702 if (h->plt.offset != (bfd_vma) -1)
2703 {
2704 if (htab->plt_second != NULL)
2705 {
2706 resolved_plt = htab->plt_second;
2707 plt_offset = eh->plt_second.offset;
2708 }
2709 else
2710 {
2711 resolved_plt = htab->elf.splt;
2712 plt_offset = h->plt.offset;
2713 }
2714 }
2715 else
2716 {
2717 resolved_plt = htab->plt_got;
2718 plt_offset = eh->plt_got.offset;
2719 }
2720
2721 relocation = (resolved_plt->output_section->vma
2722 + resolved_plt->output_offset
2723 + plt_offset);
2724 unresolved_reloc = FALSE;
2725 break;
2726
2727 case R_386_SIZE32:
2728 /* Set to symbol size. */
2729 relocation = st_size;
2730 /* Fall through. */
2731
2732 case R_386_32:
2733 case R_386_PC32:
2734 if ((input_section->flags & SEC_ALLOC) == 0
2735 || is_vxworks_tls)
2736 break;
2737
2738 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2739 FALSE, resolved_to_zero,
2740 (r_type == R_386_PC32)))
2741 {
2742 Elf_Internal_Rela outrel;
2743 bfd_boolean skip, relocate;
2744 asection *sreloc;
2745
2746 /* When generating a shared object, these relocations
2747 are copied into the output file to be resolved at run
2748 time. */
2749
2750 skip = FALSE;
2751 relocate = FALSE;
2752
2753 outrel.r_offset =
2754 _bfd_elf_section_offset (output_bfd, info, input_section,
2755 rel->r_offset);
2756 if (outrel.r_offset == (bfd_vma) -1)
2757 skip = TRUE;
2758 else if (outrel.r_offset == (bfd_vma) -2)
2759 skip = TRUE, relocate = TRUE;
2760 outrel.r_offset += (input_section->output_section->vma
2761 + input_section->output_offset);
2762
2763 if (skip)
2764 memset (&outrel, 0, sizeof outrel);
2765 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2766 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2767 else
2768 {
2769 /* This symbol is local, or marked to become local. */
2770 relocate = TRUE;
2771 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2772 }
2773
2774 sreloc = elf_section_data (input_section)->sreloc;
2775
2776 if (sreloc == NULL || sreloc->contents == NULL)
2777 {
2778 r = bfd_reloc_notsupported;
2779 goto check_relocation_error;
2780 }
2781
2782 elf_append_rel (output_bfd, sreloc, &outrel);
2783
2784 /* If this reloc is against an external symbol, we do
2785 not want to fiddle with the addend. Otherwise, we
2786 need to include the symbol value so that it becomes
2787 an addend for the dynamic reloc. */
2788 if (! relocate)
2789 continue;
2790 }
2791 break;
2792
2793 case R_386_TLS_IE:
2794 if (!bfd_link_executable (info))
2795 {
2796 Elf_Internal_Rela outrel;
2797 asection *sreloc;
2798
2799 outrel.r_offset = rel->r_offset
2800 + input_section->output_section->vma
2801 + input_section->output_offset;
2802 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2803 sreloc = elf_section_data (input_section)->sreloc;
2804 if (sreloc == NULL)
2805 abort ();
2806 elf_append_rel (output_bfd, sreloc, &outrel);
2807 }
2808 /* Fall through */
2809
2810 case R_386_TLS_GD:
2811 case R_386_TLS_GOTDESC:
2812 case R_386_TLS_DESC_CALL:
2813 case R_386_TLS_IE_32:
2814 case R_386_TLS_GOTIE:
2815 tls_type = GOT_UNKNOWN;
2816 if (h == NULL && local_got_offsets)
2817 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2818 else if (h != NULL)
2819 tls_type = elf_x86_hash_entry(h)->tls_type;
2820 if (tls_type == GOT_TLS_IE)
2821 tls_type = GOT_TLS_IE_NEG;
2822
2823 r_type_tls = r_type;
2824 if (! elf_i386_tls_transition (info, input_bfd,
2825 input_section, contents,
2826 symtab_hdr, sym_hashes,
2827 &r_type_tls, tls_type, rel,
2828 relend, h, r_symndx, TRUE))
2829 return FALSE;
2830
2831 if (r_type_tls == R_386_TLS_LE_32)
2832 {
2833 BFD_ASSERT (! unresolved_reloc);
2834 if (r_type == R_386_TLS_GD)
2835 {
2836 unsigned int type;
2837 bfd_vma roff;
2838
2839 /* GD->LE transition. */
2840 type = *(contents + rel->r_offset - 2);
2841 if (type == 0x04)
2842 {
2843 /* Change
2844 leal foo@tlsgd(,%ebx,1), %eax
2845 call ___tls_get_addr@PLT
2846 into:
2847 movl %gs:0, %eax
2848 subl $foo@tpoff, %eax
2849 (6 byte form of subl). */
2850 roff = rel->r_offset + 5;
2851 }
2852 else
2853 {
2854 /* Change
2855 leal foo@tlsgd(%ebx), %eax
2856 call ___tls_get_addr@PLT
2857 nop
2858 or
2859 leal foo@tlsgd(%reg), %eax
2860 call *___tls_get_addr@GOT(%reg)
2861 which may be converted to
2862 addr32 call ___tls_get_addr
2863 into:
2864 movl %gs:0, %eax; subl $foo@tpoff, %eax
2865 (6 byte form of subl). */
2866 roff = rel->r_offset + 6;
2867 }
2868 memcpy (contents + roff - 8,
2869 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2870 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2871 contents + roff);
2872 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2873 rel++;
2874 wrel++;
2875 continue;
2876 }
2877 else if (r_type == R_386_TLS_GOTDESC)
2878 {
2879 /* GDesc -> LE transition.
2880 It's originally something like:
2881 leal x@tlsdesc(%ebx), %eax
2882
2883 leal x@ntpoff, %eax
2884
2885 Registers other than %eax may be set up here. */
2886
2887 unsigned int val;
2888 bfd_vma roff;
2889
2890 roff = rel->r_offset;
2891 val = bfd_get_8 (input_bfd, contents + roff - 1);
2892
2893 /* Now modify the instruction as appropriate. */
2894 /* aoliva FIXME: remove the above and xor the byte
2895 below with 0x86. */
2896 bfd_put_8 (output_bfd, val ^ 0x86,
2897 contents + roff - 1);
2898 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2899 contents + roff);
2900 continue;
2901 }
2902 else if (r_type == R_386_TLS_DESC_CALL)
2903 {
2904 /* GDesc -> LE transition.
2905 It's originally:
2906 call *(%eax)
2907 Turn it into:
2908 xchg %ax,%ax */
2909
2910 bfd_vma roff;
2911
2912 roff = rel->r_offset;
2913 bfd_put_8 (output_bfd, 0x66, contents + roff);
2914 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2915 continue;
2916 }
2917 else if (r_type == R_386_TLS_IE)
2918 {
2919 unsigned int val;
2920
2921 /* IE->LE transition:
2922 Originally it can be one of:
2923 movl foo, %eax
2924 movl foo, %reg
2925 addl foo, %reg
2926 We change it into:
2927 movl $foo, %eax
2928 movl $foo, %reg
2929 addl $foo, %reg. */
2930 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2931 if (val == 0xa1)
2932 {
2933 /* movl foo, %eax. */
2934 bfd_put_8 (output_bfd, 0xb8,
2935 contents + rel->r_offset - 1);
2936 }
2937 else
2938 {
2939 unsigned int type;
2940
2941 type = bfd_get_8 (input_bfd,
2942 contents + rel->r_offset - 2);
2943 switch (type)
2944 {
2945 case 0x8b:
2946 /* movl */
2947 bfd_put_8 (output_bfd, 0xc7,
2948 contents + rel->r_offset - 2);
2949 bfd_put_8 (output_bfd,
2950 0xc0 | ((val >> 3) & 7),
2951 contents + rel->r_offset - 1);
2952 break;
2953 case 0x03:
2954 /* addl */
2955 bfd_put_8 (output_bfd, 0x81,
2956 contents + rel->r_offset - 2);
2957 bfd_put_8 (output_bfd,
2958 0xc0 | ((val >> 3) & 7),
2959 contents + rel->r_offset - 1);
2960 break;
2961 default:
2962 BFD_FAIL ();
2963 break;
2964 }
2965 }
2966 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2967 contents + rel->r_offset);
2968 continue;
2969 }
2970 else
2971 {
2972 unsigned int val, type;
2973
2974 /* {IE_32,GOTIE}->LE transition:
2975 Originally it can be one of:
2976 subl foo(%reg1), %reg2
2977 movl foo(%reg1), %reg2
2978 addl foo(%reg1), %reg2
2979 We change it into:
2980 subl $foo, %reg2
2981 movl $foo, %reg2 (6 byte form)
2982 addl $foo, %reg2. */
2983 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2984 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2985 if (type == 0x8b)
2986 {
2987 /* movl */
2988 bfd_put_8 (output_bfd, 0xc7,
2989 contents + rel->r_offset - 2);
2990 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2991 contents + rel->r_offset - 1);
2992 }
2993 else if (type == 0x2b)
2994 {
2995 /* subl */
2996 bfd_put_8 (output_bfd, 0x81,
2997 contents + rel->r_offset - 2);
2998 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2999 contents + rel->r_offset - 1);
3000 }
3001 else if (type == 0x03)
3002 {
3003 /* addl */
3004 bfd_put_8 (output_bfd, 0x81,
3005 contents + rel->r_offset - 2);
3006 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3007 contents + rel->r_offset - 1);
3008 }
3009 else
3010 BFD_FAIL ();
3011 if (r_type == R_386_TLS_GOTIE)
3012 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3013 contents + rel->r_offset);
3014 else
3015 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3016 contents + rel->r_offset);
3017 continue;
3018 }
3019 }
3020
3021 if (htab->elf.sgot == NULL)
3022 abort ();
3023
3024 if (h != NULL)
3025 {
3026 off = h->got.offset;
3027 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3028 }
3029 else
3030 {
3031 if (local_got_offsets == NULL)
3032 abort ();
3033
3034 off = local_got_offsets[r_symndx];
3035 offplt = local_tlsdesc_gotents[r_symndx];
3036 }
3037
3038 if ((off & 1) != 0)
3039 off &= ~1;
3040 else
3041 {
3042 Elf_Internal_Rela outrel;
3043 int dr_type;
3044 asection *sreloc;
3045
3046 if (htab->elf.srelgot == NULL)
3047 abort ();
3048
3049 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3050
3051 if (GOT_TLS_GDESC_P (tls_type))
3052 {
3053 bfd_byte *loc;
3054 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3055 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3056 <= htab->elf.sgotplt->size);
3057 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3058 + htab->elf.sgotplt->output_offset
3059 + offplt
3060 + htab->sgotplt_jump_table_size);
3061 sreloc = htab->elf.srelplt;
3062 loc = sreloc->contents;
3063 loc += (htab->next_tls_desc_index++
3064 * sizeof (Elf32_External_Rel));
3065 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3066 <= sreloc->contents + sreloc->size);
3067 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3068 if (indx == 0)
3069 {
3070 BFD_ASSERT (! unresolved_reloc);
3071 bfd_put_32 (output_bfd,
3072 relocation - _bfd_x86_elf_dtpoff_base (info),
3073 htab->elf.sgotplt->contents + offplt
3074 + htab->sgotplt_jump_table_size + 4);
3075 }
3076 else
3077 {
3078 bfd_put_32 (output_bfd, 0,
3079 htab->elf.sgotplt->contents + offplt
3080 + htab->sgotplt_jump_table_size + 4);
3081 }
3082 }
3083
3084 sreloc = htab->elf.srelgot;
3085
3086 outrel.r_offset = (htab->elf.sgot->output_section->vma
3087 + htab->elf.sgot->output_offset + off);
3088
3089 if (GOT_TLS_GD_P (tls_type))
3090 dr_type = R_386_TLS_DTPMOD32;
3091 else if (GOT_TLS_GDESC_P (tls_type))
3092 goto dr_done;
3093 else if (tls_type == GOT_TLS_IE_POS)
3094 dr_type = R_386_TLS_TPOFF;
3095 else
3096 dr_type = R_386_TLS_TPOFF32;
3097
3098 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3099 bfd_put_32 (output_bfd,
3100 relocation - _bfd_x86_elf_dtpoff_base (info),
3101 htab->elf.sgot->contents + off);
3102 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3103 bfd_put_32 (output_bfd,
3104 _bfd_x86_elf_dtpoff_base (info) - relocation,
3105 htab->elf.sgot->contents + off);
3106 else if (dr_type != R_386_TLS_DESC)
3107 bfd_put_32 (output_bfd, 0,
3108 htab->elf.sgot->contents + off);
3109 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3110
3111 elf_append_rel (output_bfd, sreloc, &outrel);
3112
3113 if (GOT_TLS_GD_P (tls_type))
3114 {
3115 if (indx == 0)
3116 {
3117 BFD_ASSERT (! unresolved_reloc);
3118 bfd_put_32 (output_bfd,
3119 relocation - _bfd_x86_elf_dtpoff_base (info),
3120 htab->elf.sgot->contents + off + 4);
3121 }
3122 else
3123 {
3124 bfd_put_32 (output_bfd, 0,
3125 htab->elf.sgot->contents + off + 4);
3126 outrel.r_info = ELF32_R_INFO (indx,
3127 R_386_TLS_DTPOFF32);
3128 outrel.r_offset += 4;
3129 elf_append_rel (output_bfd, sreloc, &outrel);
3130 }
3131 }
3132 else if (tls_type == GOT_TLS_IE_BOTH)
3133 {
3134 bfd_put_32 (output_bfd,
3135 (indx == 0
3136 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3137 : 0),
3138 htab->elf.sgot->contents + off + 4);
3139 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3140 outrel.r_offset += 4;
3141 elf_append_rel (output_bfd, sreloc, &outrel);
3142 }
3143
3144 dr_done:
3145 if (h != NULL)
3146 h->got.offset |= 1;
3147 else
3148 local_got_offsets[r_symndx] |= 1;
3149 }
3150
3151 if (off >= (bfd_vma) -2
3152 && ! GOT_TLS_GDESC_P (tls_type))
3153 abort ();
3154 if (r_type_tls == R_386_TLS_GOTDESC
3155 || r_type_tls == R_386_TLS_DESC_CALL)
3156 {
3157 relocation = htab->sgotplt_jump_table_size + offplt;
3158 unresolved_reloc = FALSE;
3159 }
3160 else if (r_type_tls == r_type)
3161 {
3162 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3163 + htab->elf.sgotplt->output_offset;
3164 relocation = htab->elf.sgot->output_section->vma
3165 + htab->elf.sgot->output_offset + off - g_o_t;
3166 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3167 && tls_type == GOT_TLS_IE_BOTH)
3168 relocation += 4;
3169 if (r_type == R_386_TLS_IE)
3170 relocation += g_o_t;
3171 unresolved_reloc = FALSE;
3172 }
3173 else if (r_type == R_386_TLS_GD)
3174 {
3175 unsigned int val, type;
3176 bfd_vma roff;
3177
3178 /* GD->IE transition. */
3179 type = *(contents + rel->r_offset - 2);
3180 val = *(contents + rel->r_offset - 1);
3181 if (type == 0x04)
3182 {
3183 /* Change
3184 leal foo@tlsgd(,%ebx,1), %eax
3185 call ___tls_get_addr@PLT
3186 into:
3187 movl %gs:0, %eax
3188 subl $foo@gottpoff(%ebx), %eax. */
3189 val >>= 3;
3190 roff = rel->r_offset - 3;
3191 }
3192 else
3193 {
3194 /* Change
3195 leal foo@tlsgd(%ebx), %eax
3196 call ___tls_get_addr@PLT
3197 nop
3198 or
3199 leal foo@tlsgd(%reg), %eax
3200 call *___tls_get_addr@GOT(%reg)
3201 which may be converted to
3202 addr32 call ___tls_get_addr
3203 into:
3204 movl %gs:0, %eax;
3205 subl $foo@gottpoff(%reg), %eax. */
3206 roff = rel->r_offset - 2;
3207 }
3208 memcpy (contents + roff,
3209 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3210 contents[roff + 7] = 0x80 | (val & 7);
3211 /* If foo is used only with foo@gotntpoff(%reg) and
3212 foo@indntpoff, but not with foo@gottpoff(%reg), change
3213 subl $foo@gottpoff(%reg), %eax
3214 into:
3215 addl $foo@gotntpoff(%reg), %eax. */
3216 if (tls_type == GOT_TLS_IE_POS)
3217 contents[roff + 6] = 0x03;
3218 bfd_put_32 (output_bfd,
3219 htab->elf.sgot->output_section->vma
3220 + htab->elf.sgot->output_offset + off
3221 - htab->elf.sgotplt->output_section->vma
3222 - htab->elf.sgotplt->output_offset,
3223 contents + roff + 8);
3224 /* Skip R_386_PLT32 and R_386_GOT32X. */
3225 rel++;
3226 wrel++;
3227 continue;
3228 }
3229 else if (r_type == R_386_TLS_GOTDESC)
3230 {
3231 /* GDesc -> IE transition.
3232 It's originally something like:
3233 leal x@tlsdesc(%ebx), %eax
3234
3235 Change it to:
3236 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3237 or:
3238 movl x@gottpoff(%ebx), %eax # before negl %eax
3239
3240 Registers other than %eax may be set up here. */
3241
3242 bfd_vma roff;
3243
3244 /* First, make sure it's a leal adding ebx to a 32-bit
3245 offset into any register, although it's probably
3246 almost always going to be eax. */
3247 roff = rel->r_offset;
3248
3249 /* Now modify the instruction as appropriate. */
3250 /* To turn a leal into a movl in the form we use it, it
3251 suffices to change the first byte from 0x8d to 0x8b.
3252 aoliva FIXME: should we decide to keep the leal, all
3253 we have to do is remove the statement below, and
3254 adjust the relaxation of R_386_TLS_DESC_CALL. */
3255 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3256
3257 if (tls_type == GOT_TLS_IE_BOTH)
3258 off += 4;
3259
3260 bfd_put_32 (output_bfd,
3261 htab->elf.sgot->output_section->vma
3262 + htab->elf.sgot->output_offset + off
3263 - htab->elf.sgotplt->output_section->vma
3264 - htab->elf.sgotplt->output_offset,
3265 contents + roff);
3266 continue;
3267 }
3268 else if (r_type == R_386_TLS_DESC_CALL)
3269 {
3270 /* GDesc -> IE transition.
3271 It's originally:
3272 call *(%eax)
3273
3274 Change it to:
3275 xchg %ax,%ax
3276 or
3277 negl %eax
3278 depending on how we transformed the TLS_GOTDESC above.
3279 */
3280
3281 bfd_vma roff;
3282
3283 roff = rel->r_offset;
3284
3285 /* Now modify the instruction as appropriate. */
3286 if (tls_type != GOT_TLS_IE_NEG)
3287 {
3288 /* xchg %ax,%ax */
3289 bfd_put_8 (output_bfd, 0x66, contents + roff);
3290 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3291 }
3292 else
3293 {
3294 /* negl %eax */
3295 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3296 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3297 }
3298
3299 continue;
3300 }
3301 else
3302 BFD_ASSERT (FALSE);
3303 break;
3304
3305 case R_386_TLS_LDM:
3306 if (! elf_i386_tls_transition (info, input_bfd,
3307 input_section, contents,
3308 symtab_hdr, sym_hashes,
3309 &r_type, GOT_UNKNOWN, rel,
3310 relend, h, r_symndx, TRUE))
3311 return FALSE;
3312
3313 if (r_type != R_386_TLS_LDM)
3314 {
3315 /* LD->LE transition. Change
3316 leal foo@tlsldm(%ebx) %eax
3317 call ___tls_get_addr@PLT
3318 into:
3319 movl %gs:0, %eax
3320 nop
3321 leal 0(%esi,1), %esi
3322 or change
3323 leal foo@tlsldm(%reg) %eax
3324 call *___tls_get_addr@GOT(%reg)
3325 which may be converted to
3326 addr32 call ___tls_get_addr
3327 into:
3328 movl %gs:0, %eax
3329 leal 0(%esi), %esi */
3330 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3331 if (*(contents + rel->r_offset + 4) == 0xff
3332 || *(contents + rel->r_offset + 4) == 0x67)
3333 memcpy (contents + rel->r_offset - 2,
3334 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3335 else
3336 memcpy (contents + rel->r_offset - 2,
3337 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3338 /* Skip R_386_PC32/R_386_PLT32. */
3339 rel++;
3340 wrel++;
3341 continue;
3342 }
3343
3344 if (htab->elf.sgot == NULL)
3345 abort ();
3346
3347 off = htab->tls_ld_or_ldm_got.offset;
3348 if (off & 1)
3349 off &= ~1;
3350 else
3351 {
3352 Elf_Internal_Rela outrel;
3353
3354 if (htab->elf.srelgot == NULL)
3355 abort ();
3356
3357 outrel.r_offset = (htab->elf.sgot->output_section->vma
3358 + htab->elf.sgot->output_offset + off);
3359
3360 bfd_put_32 (output_bfd, 0,
3361 htab->elf.sgot->contents + off);
3362 bfd_put_32 (output_bfd, 0,
3363 htab->elf.sgot->contents + off + 4);
3364 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3365 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3366 htab->tls_ld_or_ldm_got.offset |= 1;
3367 }
3368 relocation = htab->elf.sgot->output_section->vma
3369 + htab->elf.sgot->output_offset + off
3370 - htab->elf.sgotplt->output_section->vma
3371 - htab->elf.sgotplt->output_offset;
3372 unresolved_reloc = FALSE;
3373 break;
3374
3375 case R_386_TLS_LDO_32:
3376 if (!bfd_link_executable (info)
3377 || (input_section->flags & SEC_CODE) == 0)
3378 relocation -= _bfd_x86_elf_dtpoff_base (info);
3379 else
3380 /* When converting LDO to LE, we must negate. */
3381 relocation = -elf_i386_tpoff (info, relocation);
3382 break;
3383
3384 case R_386_TLS_LE_32:
3385 case R_386_TLS_LE:
3386 if (!bfd_link_executable (info))
3387 {
3388 Elf_Internal_Rela outrel;
3389 asection *sreloc;
3390
3391 outrel.r_offset = rel->r_offset
3392 + input_section->output_section->vma
3393 + input_section->output_offset;
3394 if (h != NULL && h->dynindx != -1)
3395 indx = h->dynindx;
3396 else
3397 indx = 0;
3398 if (r_type == R_386_TLS_LE_32)
3399 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3400 else
3401 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3402 sreloc = elf_section_data (input_section)->sreloc;
3403 if (sreloc == NULL)
3404 abort ();
3405 elf_append_rel (output_bfd, sreloc, &outrel);
3406 if (indx)
3407 continue;
3408 else if (r_type == R_386_TLS_LE_32)
3409 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3410 else
3411 relocation -= _bfd_x86_elf_dtpoff_base (info);
3412 }
3413 else if (r_type == R_386_TLS_LE_32)
3414 relocation = elf_i386_tpoff (info, relocation);
3415 else
3416 relocation = -elf_i386_tpoff (info, relocation);
3417 break;
3418
3419 default:
3420 break;
3421 }
3422
3423 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3424 because such sections are not SEC_ALLOC and thus ld.so will
3425 not process them. */
3426 if (unresolved_reloc
3427 && !((input_section->flags & SEC_DEBUGGING) != 0
3428 && h->def_dynamic)
3429 && _bfd_elf_section_offset (output_bfd, info, input_section,
3430 rel->r_offset) != (bfd_vma) -1)
3431 {
3432 _bfd_error_handler
3433 /* xgettext:c-format */
3434 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3435 input_bfd,
3436 input_section,
3437 rel->r_offset,
3438 howto->name,
3439 h->root.root.string);
3440 return FALSE;
3441 }
3442
3443 do_relocation:
3444 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3445 contents, rel->r_offset,
3446 relocation, 0);
3447
3448 check_relocation_error:
3449 if (r != bfd_reloc_ok)
3450 {
3451 const char *name;
3452
3453 if (h != NULL)
3454 name = h->root.root.string;
3455 else
3456 {
3457 name = bfd_elf_string_from_elf_section (input_bfd,
3458 symtab_hdr->sh_link,
3459 sym->st_name);
3460 if (name == NULL)
3461 return FALSE;
3462 if (*name == '\0')
3463 name = bfd_section_name (input_bfd, sec);
3464 }
3465
3466 if (r == bfd_reloc_overflow)
3467 (*info->callbacks->reloc_overflow)
3468 (info, (h ? &h->root : NULL), name, howto->name,
3469 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3470 else
3471 {
3472 _bfd_error_handler
3473 /* xgettext:c-format */
3474 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3475 input_bfd, input_section,
3476 rel->r_offset, name, (int) r);
3477 return FALSE;
3478 }
3479 }
3480
3481 if (wrel != rel)
3482 *wrel = *rel;
3483 }
3484
3485 if (wrel != rel)
3486 {
3487 Elf_Internal_Shdr *rel_hdr;
3488 size_t deleted = rel - wrel;
3489
3490 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3491 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3492 if (rel_hdr->sh_size == 0)
3493 {
3494 /* It is too late to remove an empty reloc section. Leave
3495 one NONE reloc.
3496 ??? What is wrong with an empty section??? */
3497 rel_hdr->sh_size = rel_hdr->sh_entsize;
3498 deleted -= 1;
3499 }
3500 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3501 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3502 input_section->reloc_count -= deleted;
3503 }
3504
3505 return TRUE;
3506 }
3507
3508 /* Finish up dynamic symbol handling. We set the contents of various
3509 dynamic sections here. */
3510
3511 static bfd_boolean
3512 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3513 struct bfd_link_info *info,
3514 struct elf_link_hash_entry *h,
3515 Elf_Internal_Sym *sym)
3516 {
3517 struct elf_x86_link_hash_table *htab;
3518 unsigned plt_entry_size;
3519 struct elf_x86_link_hash_entry *eh;
3520 bfd_boolean local_undefweak;
3521 bfd_boolean use_plt_second;
3522
3523 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3524 if (htab == NULL)
3525 return FALSE;
3526
3527 plt_entry_size = htab->plt.plt_entry_size;
3528
3529 /* Use the second PLT section only if there is .plt section. */
3530 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3531
3532 eh = (struct elf_x86_link_hash_entry *) h;
3533 if (eh->no_finish_dynamic_symbol)
3534 abort ();
3535
3536 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3537 resolved undefined weak symbols in executable so that their
3538 references have value 0 at run-time. */
3539 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3540
3541 if (h->plt.offset != (bfd_vma) -1)
3542 {
3543 bfd_vma plt_index, plt_offset;
3544 bfd_vma got_offset;
3545 Elf_Internal_Rela rel;
3546 bfd_byte *loc;
3547 asection *plt, *resolved_plt, *gotplt, *relplt;
3548
3549 /* When building a static executable, use .iplt, .igot.plt and
3550 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3551 if (htab->elf.splt != NULL)
3552 {
3553 plt = htab->elf.splt;
3554 gotplt = htab->elf.sgotplt;
3555 relplt = htab->elf.srelplt;
3556 }
3557 else
3558 {
3559 plt = htab->elf.iplt;
3560 gotplt = htab->elf.igotplt;
3561 relplt = htab->elf.irelplt;
3562 }
3563
3564 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3565
3566 /* Get the index in the procedure linkage table which
3567 corresponds to this symbol. This is the index of this symbol
3568 in all the symbols for which we are making plt entries. The
3569 first entry in the procedure linkage table is reserved.
3570
3571 Get the offset into the .got table of the entry that
3572 corresponds to this function. Each .got entry is 4 bytes.
3573 The first three are reserved.
3574
3575 For static executables, we don't reserve anything. */
3576
3577 if (plt == htab->elf.splt)
3578 {
3579 got_offset = (h->plt.offset / plt_entry_size
3580 - htab->plt.has_plt0);
3581 got_offset = (got_offset + 3) * 4;
3582 }
3583 else
3584 {
3585 got_offset = h->plt.offset / plt_entry_size;
3586 got_offset = got_offset * 4;
3587 }
3588
3589 /* Fill in the entry in the procedure linkage table and update
3590 the first slot. */
3591 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3592 plt_entry_size);
3593
3594 if (use_plt_second)
3595 {
3596 const bfd_byte *plt_entry;
3597 if (bfd_link_pic (info))
3598 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3599 else
3600 plt_entry = htab->non_lazy_plt->plt_entry;
3601 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3602 plt_entry, htab->non_lazy_plt->plt_entry_size);
3603
3604 resolved_plt = htab->plt_second;
3605 plt_offset = eh->plt_second.offset;
3606 }
3607 else
3608 {
3609 resolved_plt = plt;
3610 plt_offset = h->plt.offset;
3611 }
3612
3613 if (! bfd_link_pic (info))
3614 {
3615 bfd_put_32 (output_bfd,
3616 (gotplt->output_section->vma
3617 + gotplt->output_offset
3618 + got_offset),
3619 resolved_plt->contents + plt_offset
3620 + htab->plt.plt_got_offset);
3621
3622 if (htab->target_os == is_vxworks)
3623 {
3624 int s, k, reloc_index;
3625
3626 /* Create the R_386_32 relocation referencing the GOT
3627 for this PLT entry. */
3628
3629 /* S: Current slot number (zero-based). */
3630 s = ((h->plt.offset - htab->plt.plt_entry_size)
3631 / htab->plt.plt_entry_size);
3632 /* K: Number of relocations for PLTResolve. */
3633 if (bfd_link_pic (info))
3634 k = PLTRESOLVE_RELOCS_SHLIB;
3635 else
3636 k = PLTRESOLVE_RELOCS;
3637 /* Skip the PLTresolve relocations, and the relocations for
3638 the other PLT slots. */
3639 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3640 loc = (htab->srelplt2->contents + reloc_index
3641 * sizeof (Elf32_External_Rel));
3642
3643 rel.r_offset = (plt->output_section->vma
3644 + plt->output_offset
3645 + h->plt.offset + 2),
3646 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3647 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3648
3649 /* Create the R_386_32 relocation referencing the beginning of
3650 the PLT for this GOT entry. */
3651 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3652 + htab->elf.sgotplt->output_offset
3653 + got_offset);
3654 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3655 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3656 loc + sizeof (Elf32_External_Rel));
3657 }
3658 }
3659 else
3660 {
3661 bfd_put_32 (output_bfd, got_offset,
3662 resolved_plt->contents + plt_offset
3663 + htab->plt.plt_got_offset);
3664 }
3665
3666 /* Fill in the entry in the global offset table. Leave the entry
3667 as zero for undefined weak symbol in PIE. No PLT relocation
3668 against undefined weak symbol in PIE. */
3669 if (!local_undefweak)
3670 {
3671 if (htab->plt.has_plt0)
3672 bfd_put_32 (output_bfd,
3673 (plt->output_section->vma
3674 + plt->output_offset
3675 + h->plt.offset
3676 + htab->lazy_plt->plt_lazy_offset),
3677 gotplt->contents + got_offset);
3678
3679 /* Fill in the entry in the .rel.plt section. */
3680 rel.r_offset = (gotplt->output_section->vma
3681 + gotplt->output_offset
3682 + got_offset);
3683 if (PLT_LOCAL_IFUNC_P (info, h))
3684 {
3685 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3686 h->root.root.string,
3687 h->root.u.def.section->owner);
3688
3689 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3690 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3691 in the .got.plt section. */
3692 bfd_put_32 (output_bfd,
3693 (h->root.u.def.value
3694 + h->root.u.def.section->output_section->vma
3695 + h->root.u.def.section->output_offset),
3696 gotplt->contents + got_offset);
3697 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3698 /* R_386_IRELATIVE comes last. */
3699 plt_index = htab->next_irelative_index--;
3700 }
3701 else
3702 {
3703 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3704 plt_index = htab->next_jump_slot_index++;
3705 }
3706
3707 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3708 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3709
3710 /* Don't fill the second and third slots in PLT entry for
3711 static executables nor without PLT0. */
3712 if (plt == htab->elf.splt && htab->plt.has_plt0)
3713 {
3714 bfd_put_32 (output_bfd,
3715 plt_index * sizeof (Elf32_External_Rel),
3716 plt->contents + h->plt.offset
3717 + htab->lazy_plt->plt_reloc_offset);
3718 bfd_put_32 (output_bfd,
3719 - (h->plt.offset
3720 + htab->lazy_plt->plt_plt_offset + 4),
3721 (plt->contents + h->plt.offset
3722 + htab->lazy_plt->plt_plt_offset));
3723 }
3724 }
3725 }
3726 else if (eh->plt_got.offset != (bfd_vma) -1)
3727 {
3728 bfd_vma got_offset, plt_offset;
3729 asection *plt, *got, *gotplt;
3730 const bfd_byte *got_plt_entry;
3731
3732 /* Set the entry in the GOT procedure linkage table. */
3733 plt = htab->plt_got;
3734 got = htab->elf.sgot;
3735 gotplt = htab->elf.sgotplt;
3736 got_offset = h->got.offset;
3737
3738 if (got_offset == (bfd_vma) -1
3739 || plt == NULL
3740 || got == NULL
3741 || gotplt == NULL)
3742 abort ();
3743
3744 /* Fill in the entry in the GOT procedure linkage table. */
3745 if (! bfd_link_pic (info))
3746 {
3747 got_plt_entry = htab->non_lazy_plt->plt_entry;
3748 got_offset += got->output_section->vma + got->output_offset;
3749 }
3750 else
3751 {
3752 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3753 got_offset += (got->output_section->vma
3754 + got->output_offset
3755 - gotplt->output_section->vma
3756 - gotplt->output_offset);
3757 }
3758
3759 plt_offset = eh->plt_got.offset;
3760 memcpy (plt->contents + plt_offset, got_plt_entry,
3761 htab->non_lazy_plt->plt_entry_size);
3762 bfd_put_32 (output_bfd, got_offset,
3763 (plt->contents + plt_offset
3764 + htab->non_lazy_plt->plt_got_offset));
3765 }
3766
3767 if (!local_undefweak
3768 && !h->def_regular
3769 && (h->plt.offset != (bfd_vma) -1
3770 || eh->plt_got.offset != (bfd_vma) -1))
3771 {
3772 /* Mark the symbol as undefined, rather than as defined in
3773 the .plt section. Leave the value if there were any
3774 relocations where pointer equality matters (this is a clue
3775 for the dynamic linker, to make function pointer
3776 comparisons work between an application and shared
3777 library), otherwise set it to zero. If a function is only
3778 called from a binary, there is no need to slow down
3779 shared libraries because of that. */
3780 sym->st_shndx = SHN_UNDEF;
3781 if (!h->pointer_equality_needed)
3782 sym->st_value = 0;
3783 }
3784
3785 /* Don't generate dynamic GOT relocation against undefined weak
3786 symbol in executable. */
3787 if (h->got.offset != (bfd_vma) -1
3788 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3789 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3790 && !local_undefweak)
3791 {
3792 Elf_Internal_Rela rel;
3793 asection *relgot = htab->elf.srelgot;
3794
3795 /* This symbol has an entry in the global offset table. Set it
3796 up. */
3797
3798 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3799 abort ();
3800
3801 rel.r_offset = (htab->elf.sgot->output_section->vma
3802 + htab->elf.sgot->output_offset
3803 + (h->got.offset & ~(bfd_vma) 1));
3804
3805 /* If this is a static link, or it is a -Bsymbolic link and the
3806 symbol is defined locally or was forced to be local because
3807 of a version file, we just want to emit a RELATIVE reloc.
3808 The entry in the global offset table will already have been
3809 initialized in the relocate_section function. */
3810 if (h->def_regular
3811 && h->type == STT_GNU_IFUNC)
3812 {
3813 if (h->plt.offset == (bfd_vma) -1)
3814 {
3815 /* STT_GNU_IFUNC is referenced without PLT. */
3816 if (htab->elf.splt == NULL)
3817 {
3818 /* use .rel[a].iplt section to store .got relocations
3819 in static executable. */
3820 relgot = htab->elf.irelplt;
3821 }
3822 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3823 {
3824 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3825 h->root.root.string,
3826 h->root.u.def.section->owner);
3827
3828 bfd_put_32 (output_bfd,
3829 (h->root.u.def.value
3830 + h->root.u.def.section->output_section->vma
3831 + h->root.u.def.section->output_offset),
3832 htab->elf.sgot->contents + h->got.offset);
3833 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3834 }
3835 else
3836 goto do_glob_dat;
3837 }
3838 else if (bfd_link_pic (info))
3839 {
3840 /* Generate R_386_GLOB_DAT. */
3841 goto do_glob_dat;
3842 }
3843 else
3844 {
3845 asection *plt;
3846 bfd_vma plt_offset;
3847
3848 if (!h->pointer_equality_needed)
3849 abort ();
3850
3851 /* For non-shared object, we can't use .got.plt, which
3852 contains the real function addres if we need pointer
3853 equality. We load the GOT entry with the PLT entry. */
3854 if (htab->plt_second != NULL)
3855 {
3856 plt = htab->plt_second;
3857 plt_offset = eh->plt_second.offset;
3858 }
3859 else
3860 {
3861 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3862 plt_offset = h->plt.offset;
3863 }
3864 bfd_put_32 (output_bfd,
3865 (plt->output_section->vma
3866 + plt->output_offset + plt_offset),
3867 htab->elf.sgot->contents + h->got.offset);
3868 return TRUE;
3869 }
3870 }
3871 else if (bfd_link_pic (info)
3872 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3873 {
3874 BFD_ASSERT((h->got.offset & 1) != 0);
3875 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3876 }
3877 else
3878 {
3879 BFD_ASSERT((h->got.offset & 1) == 0);
3880 do_glob_dat:
3881 bfd_put_32 (output_bfd, (bfd_vma) 0,
3882 htab->elf.sgot->contents + h->got.offset);
3883 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3884 }
3885
3886 elf_append_rel (output_bfd, relgot, &rel);
3887 }
3888
3889 if (h->needs_copy)
3890 {
3891 Elf_Internal_Rela rel;
3892 asection *s;
3893
3894 /* This symbol needs a copy reloc. Set it up. */
3895 VERIFY_COPY_RELOC (h, htab)
3896
3897 rel.r_offset = (h->root.u.def.value
3898 + h->root.u.def.section->output_section->vma
3899 + h->root.u.def.section->output_offset);
3900 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3901 if (h->root.u.def.section == htab->elf.sdynrelro)
3902 s = htab->elf.sreldynrelro;
3903 else
3904 s = htab->elf.srelbss;
3905 elf_append_rel (output_bfd, s, &rel);
3906 }
3907
3908 return TRUE;
3909 }
3910
3911 /* Finish up local dynamic symbol handling. We set the contents of
3912 various dynamic sections here. */
3913
3914 static bfd_boolean
3915 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3916 {
3917 struct elf_link_hash_entry *h
3918 = (struct elf_link_hash_entry *) *slot;
3919 struct bfd_link_info *info
3920 = (struct bfd_link_info *) inf;
3921
3922 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3923 h, NULL);
3924 }
3925
3926 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3927 here since undefined weak symbol may not be dynamic and may not be
3928 called for elf_i386_finish_dynamic_symbol. */
3929
3930 static bfd_boolean
3931 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3932 void *inf)
3933 {
3934 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3935 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3936
3937 if (h->root.type != bfd_link_hash_undefweak
3938 || h->dynindx != -1)
3939 return TRUE;
3940
3941 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3942 info, h, NULL);
3943 }
3944
3945 /* Used to decide how to sort relocs in an optimal manner for the
3946 dynamic linker, before writing them out. */
3947
3948 static enum elf_reloc_type_class
3949 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3950 const asection *rel_sec ATTRIBUTE_UNUSED,
3951 const Elf_Internal_Rela *rela)
3952 {
3953 bfd *abfd = info->output_bfd;
3954 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3955 struct elf_link_hash_table *htab = elf_hash_table (info);
3956
3957 if (htab->dynsym != NULL
3958 && htab->dynsym->contents != NULL)
3959 {
3960 /* Check relocation against STT_GNU_IFUNC symbol if there are
3961 dynamic symbols. */
3962 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3963 if (r_symndx != STN_UNDEF)
3964 {
3965 Elf_Internal_Sym sym;
3966 if (!bed->s->swap_symbol_in (abfd,
3967 (htab->dynsym->contents
3968 + r_symndx * sizeof (Elf32_External_Sym)),
3969 0, &sym))
3970 abort ();
3971
3972 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3973 return reloc_class_ifunc;
3974 }
3975 }
3976
3977 switch (ELF32_R_TYPE (rela->r_info))
3978 {
3979 case R_386_IRELATIVE:
3980 return reloc_class_ifunc;
3981 case R_386_RELATIVE:
3982 return reloc_class_relative;
3983 case R_386_JUMP_SLOT:
3984 return reloc_class_plt;
3985 case R_386_COPY:
3986 return reloc_class_copy;
3987 default:
3988 return reloc_class_normal;
3989 }
3990 }
3991
3992 /* Finish up the dynamic sections. */
3993
3994 static bfd_boolean
3995 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3996 struct bfd_link_info *info)
3997 {
3998 struct elf_x86_link_hash_table *htab;
3999
4000 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4001 if (htab == NULL)
4002 return FALSE;
4003
4004 if (!htab->elf.dynamic_sections_created)
4005 return TRUE;
4006
4007 if (htab->elf.splt && htab->elf.splt->size > 0)
4008 {
4009 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4010 really seem like the right value. */
4011 elf_section_data (htab->elf.splt->output_section)
4012 ->this_hdr.sh_entsize = 4;
4013
4014 if (htab->plt.has_plt0)
4015 {
4016 /* Fill in the special first entry in the procedure linkage
4017 table. */
4018 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4019 htab->lazy_plt->plt0_entry_size);
4020 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4021 htab->plt0_pad_byte,
4022 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4023 if (!bfd_link_pic (info))
4024 {
4025 bfd_put_32 (output_bfd,
4026 (htab->elf.sgotplt->output_section->vma
4027 + htab->elf.sgotplt->output_offset
4028 + 4),
4029 htab->elf.splt->contents
4030 + htab->lazy_plt->plt0_got1_offset);
4031 bfd_put_32 (output_bfd,
4032 (htab->elf.sgotplt->output_section->vma
4033 + htab->elf.sgotplt->output_offset
4034 + 8),
4035 htab->elf.splt->contents
4036 + htab->lazy_plt->plt0_got2_offset);
4037
4038 if (htab->target_os == is_vxworks)
4039 {
4040 Elf_Internal_Rela rel;
4041 int num_plts = (htab->elf.splt->size
4042 / htab->plt.plt_entry_size) - 1;
4043 unsigned char *p;
4044 asection *srelplt2 = htab->srelplt2;
4045
4046 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4047 + 4. On IA32 we use REL relocations so the
4048 addend goes in the PLT directly. */
4049 rel.r_offset = (htab->elf.splt->output_section->vma
4050 + htab->elf.splt->output_offset
4051 + htab->lazy_plt->plt0_got1_offset);
4052 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4053 R_386_32);
4054 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4055 srelplt2->contents);
4056 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4057 + 8. */
4058 rel.r_offset = (htab->elf.splt->output_section->vma
4059 + htab->elf.splt->output_offset
4060 + htab->lazy_plt->plt0_got2_offset);
4061 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4062 R_386_32);
4063 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4064 srelplt2->contents +
4065 sizeof (Elf32_External_Rel));
4066 /* Correct the .rel.plt.unloaded relocations. */
4067 p = srelplt2->contents;
4068 if (bfd_link_pic (info))
4069 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4070 else
4071 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4072
4073 for (; num_plts; num_plts--)
4074 {
4075 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4076 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4077 R_386_32);
4078 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4079 p += sizeof (Elf32_External_Rel);
4080
4081 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4082 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4083 R_386_32);
4084 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4085 p += sizeof (Elf32_External_Rel);
4086 }
4087 }
4088 }
4089 }
4090 }
4091
4092 /* Fill PLT entries for undefined weak symbols in PIE. */
4093 if (bfd_link_pie (info))
4094 bfd_hash_traverse (&info->hash->table,
4095 elf_i386_pie_finish_undefweak_symbol,
4096 info);
4097
4098 return TRUE;
4099 }
4100
4101 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4102 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4103 It has to be done before elf_link_sort_relocs is called so that
4104 dynamic relocations are properly sorted. */
4105
4106 static bfd_boolean
4107 elf_i386_output_arch_local_syms
4108 (bfd *output_bfd ATTRIBUTE_UNUSED,
4109 struct bfd_link_info *info,
4110 void *flaginfo ATTRIBUTE_UNUSED,
4111 int (*func) (void *, const char *,
4112 Elf_Internal_Sym *,
4113 asection *,
4114 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4115 {
4116 struct elf_x86_link_hash_table *htab
4117 = elf_x86_hash_table (info, I386_ELF_DATA);
4118 if (htab == NULL)
4119 return FALSE;
4120
4121 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4122 htab_traverse (htab->loc_hash_table,
4123 elf_i386_finish_local_dynamic_symbol,
4124 info);
4125
4126 return TRUE;
4127 }
4128
4129 /* Forward declaration. */
4130 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4131
4132 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4133 dynamic relocations. */
4134
4135 static long
4136 elf_i386_get_synthetic_symtab (bfd *abfd,
4137 long symcount ATTRIBUTE_UNUSED,
4138 asymbol **syms ATTRIBUTE_UNUSED,
4139 long dynsymcount,
4140 asymbol **dynsyms,
4141 asymbol **ret)
4142 {
4143 long count, i, n;
4144 int j;
4145 bfd_byte *plt_contents;
4146 long relsize;
4147 const struct elf_x86_lazy_plt_layout *lazy_plt;
4148 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4149 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4150 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4151 asection *plt;
4152 bfd_vma got_addr;
4153 enum elf_x86_plt_type plt_type;
4154 struct elf_x86_plt plts[] =
4155 {
4156 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4157 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4158 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4159 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4160 };
4161
4162 *ret = NULL;
4163
4164 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4165 return 0;
4166
4167 if (dynsymcount <= 0)
4168 return 0;
4169
4170 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4171 if (relsize <= 0)
4172 return -1;
4173
4174 non_lazy_plt = NULL;
4175 /* Silence GCC 6. */
4176 lazy_plt = NULL;
4177 non_lazy_ibt_plt = NULL;
4178 lazy_ibt_plt = NULL;
4179 switch (get_elf_x86_backend_data (abfd)->target_os)
4180 {
4181 case is_normal:
4182 non_lazy_plt = &elf_i386_non_lazy_plt;
4183 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4184 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4185 /* Fall through */
4186 case is_vxworks:
4187 lazy_plt = &elf_i386_lazy_plt;
4188 break;
4189 case is_nacl:
4190 lazy_plt = &elf_i386_nacl_plt;
4191 break;
4192 }
4193
4194 got_addr = 0;
4195
4196 count = 0;
4197 for (j = 0; plts[j].name != NULL; j++)
4198 {
4199 plt = bfd_get_section_by_name (abfd, plts[j].name);
4200 if (plt == NULL || plt->size == 0)
4201 continue;
4202
4203 /* Get the PLT section contents. */
4204 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4205 if (plt_contents == NULL)
4206 break;
4207 if (!bfd_get_section_contents (abfd, (asection *) plt,
4208 plt_contents, 0, plt->size))
4209 {
4210 free (plt_contents);
4211 break;
4212 }
4213
4214 /* Check what kind of PLT it is. */
4215 plt_type = plt_unknown;
4216 if (plts[j].type == plt_unknown
4217 && (plt->size >= (lazy_plt->plt0_entry_size
4218 + lazy_plt->plt_entry_size)))
4219 {
4220 /* Match lazy PLT first. */
4221 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4222 lazy_plt->plt0_got1_offset) == 0)
4223 {
4224 /* The fist entry in the lazy IBT PLT is the same as the
4225 normal lazy PLT. */
4226 if (lazy_ibt_plt != NULL
4227 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4228 lazy_ibt_plt->plt_entry,
4229 lazy_ibt_plt->plt_got_offset) == 0))
4230 plt_type = plt_lazy | plt_second;
4231 else
4232 plt_type = plt_lazy;
4233 }
4234 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4235 lazy_plt->plt0_got1_offset) == 0)
4236 {
4237 /* The fist entry in the PIC lazy IBT PLT is the same as
4238 the normal PIC lazy PLT. */
4239 if (lazy_ibt_plt != NULL
4240 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4241 lazy_ibt_plt->pic_plt_entry,
4242 lazy_ibt_plt->plt_got_offset) == 0))
4243 plt_type = plt_lazy | plt_pic | plt_second;
4244 else
4245 plt_type = plt_lazy | plt_pic;
4246 }
4247 }
4248
4249 if (non_lazy_plt != NULL
4250 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4251 && plt->size >= non_lazy_plt->plt_entry_size)
4252 {
4253 /* Match non-lazy PLT. */
4254 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4255 non_lazy_plt->plt_got_offset) == 0)
4256 plt_type = plt_non_lazy;
4257 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4258 non_lazy_plt->plt_got_offset) == 0)
4259 plt_type = plt_pic;
4260 }
4261
4262 if ((non_lazy_ibt_plt != NULL)
4263 && (plt_type == plt_unknown || plt_type == plt_second)
4264 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4265 {
4266 if (memcmp (plt_contents,
4267 non_lazy_ibt_plt->plt_entry,
4268 non_lazy_ibt_plt->plt_got_offset) == 0)
4269 {
4270 /* Match IBT PLT. */
4271 plt_type = plt_second;
4272 non_lazy_plt = non_lazy_ibt_plt;
4273 }
4274 else if (memcmp (plt_contents,
4275 non_lazy_ibt_plt->pic_plt_entry,
4276 non_lazy_ibt_plt->plt_got_offset) == 0)
4277 {
4278 /* Match PIC IBT PLT. */
4279 plt_type = plt_second | plt_pic;
4280 non_lazy_plt = non_lazy_ibt_plt;
4281 }
4282 }
4283
4284 if (plt_type == plt_unknown)
4285 {
4286 free (plt_contents);
4287 continue;
4288 }
4289
4290 plts[j].sec = plt;
4291 plts[j].type = plt_type;
4292
4293 if ((plt_type & plt_lazy))
4294 {
4295 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4296 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4297 /* Skip PLT0 in lazy PLT. */
4298 i = 1;
4299 }
4300 else
4301 {
4302 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4303 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4304 i = 0;
4305 }
4306
4307 /* Skip lazy PLT when the second PLT is used. */
4308 if ((plt_type & (plt_lazy | plt_second))
4309 == (plt_lazy | plt_second))
4310 plts[j].count = 0;
4311 else
4312 {
4313 n = plt->size / plts[j].plt_entry_size;
4314 plts[j].count = n;
4315 count += n - i;
4316 }
4317
4318 plts[j].contents = plt_contents;
4319
4320 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4321 if ((plt_type & plt_pic))
4322 got_addr = (bfd_vma) -1;
4323 }
4324
4325 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4326 got_addr, plts, dynsyms,
4327 ret);
4328 }
4329
4330 /* Set up i386 GNU properties. Return the first relocatable ELF input
4331 with GNU properties if found. Otherwise, return NULL. */
4332
4333 static bfd *
4334 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4335 {
4336 struct elf_x86_init_table init_table;
4337
4338 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4339 {
4340 case is_normal:
4341 init_table.plt0_pad_byte = 0x0;
4342 init_table.lazy_plt = &elf_i386_lazy_plt;
4343 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4344 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4345 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4346 break;
4347 case is_vxworks:
4348 init_table.plt0_pad_byte = 0x90;
4349 init_table.lazy_plt = &elf_i386_lazy_plt;
4350 init_table.non_lazy_plt = NULL;
4351 init_table.lazy_ibt_plt = NULL;
4352 init_table.non_lazy_ibt_plt = NULL;
4353 break;
4354 case is_nacl:
4355 init_table.plt0_pad_byte = 0x90;
4356 init_table.lazy_plt = &elf_i386_nacl_plt;
4357 init_table.non_lazy_plt = NULL;
4358 init_table.lazy_ibt_plt = NULL;
4359 init_table.non_lazy_ibt_plt = NULL;
4360 break;
4361 }
4362
4363 init_table.r_info = elf32_r_info;
4364 init_table.r_sym = elf32_r_sym;
4365
4366 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4367 }
4368
4369 #define TARGET_LITTLE_SYM i386_elf32_vec
4370 #define TARGET_LITTLE_NAME "elf32-i386"
4371 #define ELF_ARCH bfd_arch_i386
4372 #define ELF_TARGET_ID I386_ELF_DATA
4373 #define ELF_MACHINE_CODE EM_386
4374 #define ELF_MAXPAGESIZE 0x1000
4375
4376 #define elf_backend_can_gc_sections 1
4377 #define elf_backend_can_refcount 1
4378 #define elf_backend_want_got_plt 1
4379 #define elf_backend_plt_readonly 1
4380 #define elf_backend_want_plt_sym 0
4381 #define elf_backend_got_header_size 12
4382 #define elf_backend_plt_alignment 4
4383 #define elf_backend_dtrel_excludes_plt 1
4384 #define elf_backend_extern_protected_data 1
4385 #define elf_backend_caches_rawsize 1
4386 #define elf_backend_want_dynrelro 1
4387
4388 /* Support RELA for objdump of prelink objects. */
4389 #define elf_info_to_howto elf_i386_info_to_howto_rel
4390 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4391
4392 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4393 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4394 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4395 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4396
4397 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4398 #define elf_backend_check_relocs elf_i386_check_relocs
4399 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4400 #define elf_backend_fake_sections elf_i386_fake_sections
4401 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4402 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4403 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4404 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4405 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4406 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4407 #define elf_backend_relocate_section elf_i386_relocate_section
4408 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4409 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4410
4411 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4412
4413 #include "elf32-target.h"
4414
4415 /* FreeBSD support. */
4416
4417 #undef TARGET_LITTLE_SYM
4418 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4419 #undef TARGET_LITTLE_NAME
4420 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4421 #undef ELF_OSABI
4422 #define ELF_OSABI ELFOSABI_FREEBSD
4423
4424 /* The kernel recognizes executables as valid only if they carry a
4425 "FreeBSD" label in the ELF header. So we put this label on all
4426 executables and (for simplicity) also all other object files. */
4427
4428 static void
4429 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4430 {
4431 _bfd_elf_post_process_headers (abfd, info);
4432
4433 #ifdef OLD_FREEBSD_ABI_LABEL
4434 {
4435 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4436 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4437 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4438 }
4439 #endif
4440 }
4441
4442 #undef elf_backend_post_process_headers
4443 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4444 #undef elf32_bed
4445 #define elf32_bed elf32_i386_fbsd_bed
4446
4447 #undef elf_backend_add_symbol_hook
4448
4449 #include "elf32-target.h"
4450
4451 /* Solaris 2. */
4452
4453 #undef TARGET_LITTLE_SYM
4454 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4455 #undef TARGET_LITTLE_NAME
4456 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4457
4458 #undef elf_backend_post_process_headers
4459
4460 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4461 objects won't be recognized. */
4462 #undef ELF_OSABI
4463
4464 #undef elf32_bed
4465 #define elf32_bed elf32_i386_sol2_bed
4466
4467 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4468 boundary. */
4469 #undef elf_backend_static_tls_alignment
4470 #define elf_backend_static_tls_alignment 8
4471
4472 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4473
4474 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4475 File, p.63. */
4476 #undef elf_backend_want_plt_sym
4477 #define elf_backend_want_plt_sym 1
4478
4479 #undef elf_backend_strtab_flags
4480 #define elf_backend_strtab_flags SHF_STRINGS
4481
4482 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4483 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4484 FALSE otherwise. ISECTION is the best guess matching section from the
4485 input bfd IBFD, but it might be NULL. */
4486
4487 static bfd_boolean
4488 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4489 bfd *obfd ATTRIBUTE_UNUSED,
4490 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4491 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4492 {
4493 /* PR 19938: FIXME: Need to add code for setting the sh_info
4494 and sh_link fields of Solaris specific section types. */
4495 return FALSE;
4496
4497 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4498 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4499
4500 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4501
4502 The following values should be set:
4503
4504 Type Link Info
4505 -----------------------------------------------------------------------------
4506 SHT_SUNW_ancillary The section header index of 0
4507 [0x6fffffee] the associated string table.
4508
4509 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4510 [0x6ffffff0] the associated symbol table. section header index of
4511 the associated
4512 SHT_SUNW_capchain table,
4513 otherwise 0.
4514
4515 SHT_SUNW_symsort The section header index of 0
4516 [0x6ffffff1] the associated symbol table.
4517
4518 SHT_SUNW_tlssort The section header index of 0
4519 [0x6ffffff2] the associated symbol table.
4520
4521 SHT_SUNW_LDYNSYM The section header index of One greater than the
4522 [0x6ffffff3] the associated string table. symbol table index of the
4523 This index is the same string last local symbol,
4524 table used by the SHT_DYNSYM STB_LOCAL. Since
4525 section. SHT_SUNW_LDYNSYM only
4526 contains local symbols,
4527 sh_info is equivalent to
4528 the number of symbols in
4529 the table.
4530
4531 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4532 [0x6ffffff5] the section header index of to named strings, the
4533 the associated section header index of
4534 SHT_SUNW_capinfo table, the associated string
4535 otherwise 0. table, otherwise 0.
4536
4537 SHT_SUNW_move The section header index of 0
4538 [0x6ffffffa] the associated symbol table.
4539
4540 SHT_SUNW_COMDAT 0 0
4541 [0x6ffffffb]
4542
4543 SHT_SUNW_syminfo The section header index of The section header index
4544 [0x6ffffffc] the associated symbol table. of the associated
4545 .dynamic section.
4546
4547 SHT_SUNW_verdef The section header index of The number of version
4548 [0x6ffffffd] the associated string table. definitions within the
4549 section.
4550
4551 SHT_SUNW_verneed The section header index of The number of version
4552 [0x6ffffffe] the associated string table. dependencies within the
4553 section.
4554
4555 SHT_SUNW_versym The section header index of 0
4556 [0x6fffffff] the associated symbol table. */
4557 }
4558
4559 #undef elf_backend_copy_special_section_fields
4560 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4561
4562 #include "elf32-target.h"
4563
4564 /* Intel MCU support. */
4565
4566 static bfd_boolean
4567 elf32_iamcu_elf_object_p (bfd *abfd)
4568 {
4569 /* Set the right machine number for an IAMCU elf32 file. */
4570 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4571 return TRUE;
4572 }
4573
4574 #undef TARGET_LITTLE_SYM
4575 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4576 #undef TARGET_LITTLE_NAME
4577 #define TARGET_LITTLE_NAME "elf32-iamcu"
4578 #undef ELF_ARCH
4579 #define ELF_ARCH bfd_arch_iamcu
4580
4581 #undef ELF_MACHINE_CODE
4582 #define ELF_MACHINE_CODE EM_IAMCU
4583
4584 #undef ELF_OSABI
4585
4586 #undef elf32_bed
4587 #define elf32_bed elf32_iamcu_bed
4588
4589 #undef elf_backend_object_p
4590 #define elf_backend_object_p elf32_iamcu_elf_object_p
4591
4592 #undef elf_backend_static_tls_alignment
4593
4594 #undef elf_backend_want_plt_sym
4595 #define elf_backend_want_plt_sym 0
4596
4597 #undef elf_backend_strtab_flags
4598 #undef elf_backend_copy_special_section_fields
4599
4600 #include "elf32-target.h"
4601
4602 /* Restore defaults. */
4603 #undef ELF_ARCH
4604 #define ELF_ARCH bfd_arch_i386
4605 #undef ELF_MACHINE_CODE
4606 #define ELF_MACHINE_CODE EM_386
4607
4608 /* Native Client support. */
4609
4610 #undef TARGET_LITTLE_SYM
4611 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4612 #undef TARGET_LITTLE_NAME
4613 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4614 #undef elf32_bed
4615 #define elf32_bed elf32_i386_nacl_bed
4616
4617 #undef ELF_MAXPAGESIZE
4618 #define ELF_MAXPAGESIZE 0x10000
4619
4620 /* Restore defaults. */
4621 #undef ELF_OSABI
4622 #undef elf_backend_want_plt_sym
4623 #define elf_backend_want_plt_sym 0
4624 #undef elf_backend_post_process_headers
4625 #undef elf_backend_static_tls_alignment
4626
4627 /* NaCl uses substantially different PLT entries for the same effects. */
4628
4629 #undef elf_backend_plt_alignment
4630 #define elf_backend_plt_alignment 5
4631 #define NACL_PLT_ENTRY_SIZE 64
4632 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4633
4634 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4635 {
4636 0xff, 0x35, /* pushl contents of address */
4637 0, 0, 0, 0, /* replaced with address of .got + 4. */
4638 0x8b, 0x0d, /* movl contents of address, %ecx */
4639 0, 0, 0, 0, /* replaced with address of .got + 8. */
4640 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4641 0xff, 0xe1 /* jmp *%ecx */
4642 };
4643
4644 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4645 {
4646 0x8b, 0x0d, /* movl contents of address, %ecx */
4647 0, 0, 0, 0, /* replaced with GOT slot address. */
4648 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4649 0xff, 0xe1, /* jmp *%ecx */
4650
4651 /* Pad to the next 32-byte boundary with nop instructions. */
4652 0x90,
4653 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4654 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4655
4656 /* Lazy GOT entries point here (32-byte aligned). */
4657 0x68, /* pushl immediate */
4658 0, 0, 0, 0, /* replaced with reloc offset. */
4659 0xe9, /* jmp relative */
4660 0, 0, 0, 0, /* replaced with offset to .plt. */
4661
4662 /* Pad to the next 32-byte boundary with nop instructions. */
4663 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4664 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4665 0x90, 0x90
4666 };
4667
4668 static const bfd_byte
4669 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4670 {
4671 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4672 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4673 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4674 0xff, 0xe1, /* jmp *%ecx */
4675
4676 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4677 so pad to that size with nop instructions. */
4678 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4679 };
4680
4681 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4682 {
4683 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4684 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4685 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4686 0xff, 0xe1, /* jmp *%ecx */
4687
4688 /* Pad to the next 32-byte boundary with nop instructions. */
4689 0x90,
4690 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4691 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4692
4693 /* Lazy GOT entries point here (32-byte aligned). */
4694 0x68, /* pushl immediate */
4695 0, 0, 0, 0, /* replaced with offset into relocation table. */
4696 0xe9, /* jmp relative */
4697 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4698
4699 /* Pad to the next 32-byte boundary with nop instructions. */
4700 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4701 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4702 0x90, 0x90
4703 };
4704
4705 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4706 {
4707 #if (PLT_CIE_LENGTH != 20 \
4708 || PLT_FDE_LENGTH != 36 \
4709 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4710 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4711 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4712 #endif
4713 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4714 0, 0, 0, 0, /* CIE ID */
4715 1, /* CIE version */
4716 'z', 'R', 0, /* Augmentation string */
4717 1, /* Code alignment factor */
4718 0x7c, /* Data alignment factor: -4 */
4719 8, /* Return address column */
4720 1, /* Augmentation size */
4721 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4722 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4723 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4724 DW_CFA_nop, DW_CFA_nop,
4725
4726 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4727 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4728 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4729 0, 0, 0, 0, /* .plt size goes here */
4730 0, /* Augmentation size */
4731 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4732 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4733 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4734 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4735 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4736 13, /* Block length */
4737 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4738 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4739 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4740 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4741 DW_CFA_nop, DW_CFA_nop
4742 };
4743
4744 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4745 {
4746 elf_i386_nacl_plt0_entry, /* plt0_entry */
4747 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4748 elf_i386_nacl_plt_entry, /* plt_entry */
4749 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4750 2, /* plt0_got1_offset */
4751 8, /* plt0_got2_offset */
4752 0, /* plt0_got2_insn_end */
4753 2, /* plt_got_offset */
4754 33, /* plt_reloc_offset */
4755 38, /* plt_plt_offset */
4756 0, /* plt_got_insn_size */
4757 0, /* plt_plt_insn_end */
4758 32, /* plt_lazy_offset */
4759 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4760 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4761 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4762 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4763 };
4764
4765 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4766 {
4767 is_nacl /* os */
4768 };
4769
4770 static bfd_boolean
4771 elf32_i386_nacl_elf_object_p (bfd *abfd)
4772 {
4773 /* Set the right machine number for a NaCl i386 ELF32 file. */
4774 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4775 return TRUE;
4776 }
4777
4778 #undef elf_backend_arch_data
4779 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4780
4781 #undef elf_backend_object_p
4782 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4783 #undef elf_backend_modify_segment_map
4784 #define elf_backend_modify_segment_map nacl_modify_segment_map
4785 #undef elf_backend_modify_program_headers
4786 #define elf_backend_modify_program_headers nacl_modify_program_headers
4787 #undef elf_backend_final_write_processing
4788 #define elf_backend_final_write_processing nacl_final_write_processing
4789
4790 #include "elf32-target.h"
4791
4792 /* Restore defaults. */
4793 #undef elf_backend_object_p
4794 #undef elf_backend_modify_segment_map
4795 #undef elf_backend_modify_program_headers
4796 #undef elf_backend_final_write_processing
4797
4798 /* VxWorks support. */
4799
4800 #undef TARGET_LITTLE_SYM
4801 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4802 #undef TARGET_LITTLE_NAME
4803 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4804 #undef ELF_OSABI
4805 #undef ELF_MAXPAGESIZE
4806 #define ELF_MAXPAGESIZE 0x1000
4807 #undef elf_backend_plt_alignment
4808 #define elf_backend_plt_alignment 4
4809
4810 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4811 {
4812 is_vxworks /* os */
4813 };
4814
4815 #undef elf_backend_arch_data
4816 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4817
4818 #undef elf_backend_relocs_compatible
4819 #undef elf_backend_add_symbol_hook
4820 #define elf_backend_add_symbol_hook \
4821 elf_vxworks_add_symbol_hook
4822 #undef elf_backend_link_output_symbol_hook
4823 #define elf_backend_link_output_symbol_hook \
4824 elf_vxworks_link_output_symbol_hook
4825 #undef elf_backend_emit_relocs
4826 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4827 #undef elf_backend_final_write_processing
4828 #define elf_backend_final_write_processing \
4829 elf_vxworks_final_write_processing
4830 #undef elf_backend_static_tls_alignment
4831
4832 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4833 define it. */
4834 #undef elf_backend_want_plt_sym
4835 #define elf_backend_want_plt_sym 1
4836
4837 #undef elf32_bed
4838 #define elf32_bed elf32_i386_vxworks_bed
4839
4840 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.