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aarch64: Add support for the id_aa64isar3_el1 system register
[binutils-gdb.git] / bfd / elf32-i386.c
blob703a48c2c0ab2b380fb110456e5b9419b26ba358
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2024 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-vxworks.h"
23 #include "dwarf2.h"
24 #include "opcode/i386.h"
25
26 /* 386 uses REL relocations instead of RELA. */
27 #define USE_REL 1
28
29 static reloc_howto_type elf_howto_table[]=
30 {
31 HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
32 bfd_elf_generic_reloc, "R_386_NONE",
33 true, 0x00000000, 0x00000000, false),
34 HOWTO(R_386_32, 0, 4, 32, false, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_32",
36 true, 0xffffffff, 0xffffffff, false),
37 HOWTO(R_386_PC32, 0, 4, 32, true, 0, complain_overflow_dont,
38 bfd_elf_generic_reloc, "R_386_PC32",
39 true, 0xffffffff, 0xffffffff, true),
40 HOWTO(R_386_GOT32, 0, 4, 32, false, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_GOT32",
42 true, 0xffffffff, 0xffffffff, false),
43 HOWTO(R_386_PLT32, 0, 4, 32, true, 0, complain_overflow_dont,
44 bfd_elf_generic_reloc, "R_386_PLT32",
45 true, 0xffffffff, 0xffffffff, true),
46 HOWTO(R_386_COPY, 0, 4, 32, false, 0, complain_overflow_dont,
47 bfd_elf_generic_reloc, "R_386_COPY",
48 true, 0xffffffff, 0xffffffff, false),
49 HOWTO(R_386_GLOB_DAT, 0, 4, 32, false, 0, complain_overflow_dont,
50 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
51 true, 0xffffffff, 0xffffffff, false),
52 HOWTO(R_386_JUMP_SLOT, 0, 4, 32, false, 0, complain_overflow_dont,
53 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
54 true, 0xffffffff, 0xffffffff, false),
55 HOWTO(R_386_RELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
56 bfd_elf_generic_reloc, "R_386_RELATIVE",
57 true, 0xffffffff, 0xffffffff, false),
58 HOWTO(R_386_GOTOFF, 0, 4, 32, false, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_386_GOTOFF",
60 true, 0xffffffff, 0xffffffff, false),
61 HOWTO(R_386_GOTPC, 0, 4, 32, true, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_386_GOTPC",
63 true, 0xffffffff, 0xffffffff, true),
64
65 /* We have a gap in the reloc numbers here.
66 R_386_standard counts the number up to this point, and
67 R_386_ext_offset is the value to subtract from a reloc type of
68 R_386_16 thru R_386_PC8 to form an index into this table. */
69 #define R_386_standard (R_386_GOTPC + 1)
70 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
71
72 /* These relocs are a GNU extension. */
73 HOWTO(R_386_TLS_TPOFF, 0, 4, 32, false, 0, complain_overflow_dont,
74 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
75 true, 0xffffffff, 0xffffffff, false),
76 HOWTO(R_386_TLS_IE, 0, 4, 32, false, 0, complain_overflow_dont,
77 bfd_elf_generic_reloc, "R_386_TLS_IE",
78 true, 0xffffffff, 0xffffffff, false),
79 HOWTO(R_386_TLS_GOTIE, 0, 4, 32, false, 0, complain_overflow_dont,
80 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
81 true, 0xffffffff, 0xffffffff, false),
82 HOWTO(R_386_TLS_LE, 0, 4, 32, false, 0, complain_overflow_dont,
83 bfd_elf_generic_reloc, "R_386_TLS_LE",
84 true, 0xffffffff, 0xffffffff, false),
85 HOWTO(R_386_TLS_GD, 0, 4, 32, false, 0, complain_overflow_dont,
86 bfd_elf_generic_reloc, "R_386_TLS_GD",
87 true, 0xffffffff, 0xffffffff, false),
88 HOWTO(R_386_TLS_LDM, 0, 4, 32, false, 0, complain_overflow_dont,
89 bfd_elf_generic_reloc, "R_386_TLS_LDM",
90 true, 0xffffffff, 0xffffffff, false),
91 HOWTO(R_386_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_16",
93 true, 0xffff, 0xffff, false),
94 HOWTO(R_386_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_PC16",
96 true, 0xffff, 0xffff, true),
97 HOWTO(R_386_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_8",
99 true, 0xff, 0xff, false),
100 HOWTO(R_386_PC8, 0, 1, 8, true, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_386_PC8",
102 true, 0xff, 0xff, true),
103
104 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
105 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
106 /* These are common with Solaris TLS implementation. */
107 HOWTO(R_386_TLS_LDO_32, 0, 4, 32, false, 0, complain_overflow_dont,
108 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
109 true, 0xffffffff, 0xffffffff, false),
110 HOWTO(R_386_TLS_IE_32, 0, 4, 32, false, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
112 true, 0xffffffff, 0xffffffff, false),
113 HOWTO(R_386_TLS_LE_32, 0, 4, 32, false, 0, complain_overflow_dont,
114 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
115 true, 0xffffffff, 0xffffffff, false),
116 HOWTO(R_386_TLS_DTPMOD32, 0, 4, 32, false, 0, complain_overflow_dont,
117 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
118 true, 0xffffffff, 0xffffffff, false),
119 HOWTO(R_386_TLS_DTPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
121 true, 0xffffffff, 0xffffffff, false),
122 HOWTO(R_386_TLS_TPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
123 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
124 true, 0xffffffff, 0xffffffff, false),
125 HOWTO(R_386_SIZE32, 0, 4, 32, false, 0, complain_overflow_dont,
126 bfd_elf_generic_reloc, "R_386_SIZE32",
127 true, 0xffffffff, 0xffffffff, false),
128 HOWTO(R_386_TLS_GOTDESC, 0, 4, 32, false, 0, complain_overflow_dont,
129 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
130 true, 0xffffffff, 0xffffffff, false),
131 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, false, 0, complain_overflow_dont,
132 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
133 false, 0, 0, false),
134 HOWTO(R_386_TLS_DESC, 0, 4, 32, false, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC",
136 true, 0xffffffff, 0xffffffff, false),
137 HOWTO(R_386_IRELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_IRELATIVE",
139 true, 0xffffffff, 0xffffffff, false),
140 HOWTO(R_386_GOT32X, 0, 4, 32, false, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_GOT32X",
142 true, 0xffffffff, 0xffffffff, false),
143
144 /* Another gap. */
145 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
146 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
147
148 /* GNU extension to record C++ vtable hierarchy. */
149 HOWTO (R_386_GNU_VTINHERIT, /* type */
150 0, /* rightshift */
151 4, /* size */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 NULL, /* special_function */
157 "R_386_GNU_VTINHERIT", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 false), /* pcrel_offset */
162
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_386_GNU_VTENTRY, /* type */
165 0, /* rightshift */
166 4, /* size */
167 0, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_dont, /* complain_on_overflow */
171 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
172 "R_386_GNU_VTENTRY", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0, /* dst_mask */
176 false) /* pcrel_offset */
177
178 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
179
180 };
181
182 #ifdef DEBUG_GEN_RELOC
183 #define TRACE(str) \
184 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
185 #else
186 #define TRACE(str)
187 #endif
188
189 static reloc_howto_type *
190 elf_i386_reloc_type_lookup (bfd *abfd,
191 bfd_reloc_code_real_type code)
192 {
193 switch (code)
194 {
195 case BFD_RELOC_NONE:
196 TRACE ("BFD_RELOC_NONE");
197 return &elf_howto_table[R_386_NONE];
198
199 case BFD_RELOC_32:
200 TRACE ("BFD_RELOC_32");
201 return &elf_howto_table[R_386_32];
202
203 case BFD_RELOC_CTOR:
204 TRACE ("BFD_RELOC_CTOR");
205 return &elf_howto_table[R_386_32];
206
207 case BFD_RELOC_32_PCREL:
208 TRACE ("BFD_RELOC_PC32");
209 return &elf_howto_table[R_386_PC32];
210
211 case BFD_RELOC_386_GOT32:
212 TRACE ("BFD_RELOC_386_GOT32");
213 return &elf_howto_table[R_386_GOT32];
214
215 case BFD_RELOC_386_PLT32:
216 TRACE ("BFD_RELOC_386_PLT32");
217 return &elf_howto_table[R_386_PLT32];
218
219 case BFD_RELOC_386_COPY:
220 TRACE ("BFD_RELOC_386_COPY");
221 return &elf_howto_table[R_386_COPY];
222
223 case BFD_RELOC_386_GLOB_DAT:
224 TRACE ("BFD_RELOC_386_GLOB_DAT");
225 return &elf_howto_table[R_386_GLOB_DAT];
226
227 case BFD_RELOC_386_JUMP_SLOT:
228 TRACE ("BFD_RELOC_386_JUMP_SLOT");
229 return &elf_howto_table[R_386_JUMP_SLOT];
230
231 case BFD_RELOC_386_RELATIVE:
232 TRACE ("BFD_RELOC_386_RELATIVE");
233 return &elf_howto_table[R_386_RELATIVE];
234
235 case BFD_RELOC_386_GOTOFF:
236 TRACE ("BFD_RELOC_386_GOTOFF");
237 return &elf_howto_table[R_386_GOTOFF];
238
239 case BFD_RELOC_386_GOTPC:
240 TRACE ("BFD_RELOC_386_GOTPC");
241 return &elf_howto_table[R_386_GOTPC];
242
243 /* These relocs are a GNU extension. */
244 case BFD_RELOC_386_TLS_TPOFF:
245 TRACE ("BFD_RELOC_386_TLS_TPOFF");
246 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
247
248 case BFD_RELOC_386_TLS_IE:
249 TRACE ("BFD_RELOC_386_TLS_IE");
250 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
251
252 case BFD_RELOC_386_TLS_GOTIE:
253 TRACE ("BFD_RELOC_386_TLS_GOTIE");
254 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_LE:
257 TRACE ("BFD_RELOC_386_TLS_LE");
258 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GD:
261 TRACE ("BFD_RELOC_386_TLS_GD");
262 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LDM:
265 TRACE ("BFD_RELOC_386_TLS_LDM");
266 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
267
268 case BFD_RELOC_16:
269 TRACE ("BFD_RELOC_16");
270 return &elf_howto_table[R_386_16 - R_386_ext_offset];
271
272 case BFD_RELOC_16_PCREL:
273 TRACE ("BFD_RELOC_16_PCREL");
274 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
275
276 case BFD_RELOC_8:
277 TRACE ("BFD_RELOC_8");
278 return &elf_howto_table[R_386_8 - R_386_ext_offset];
279
280 case BFD_RELOC_8_PCREL:
281 TRACE ("BFD_RELOC_8_PCREL");
282 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
283
284 /* Common with Sun TLS implementation. */
285 case BFD_RELOC_386_TLS_LDO_32:
286 TRACE ("BFD_RELOC_386_TLS_LDO_32");
287 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
288
289 case BFD_RELOC_386_TLS_IE_32:
290 TRACE ("BFD_RELOC_386_TLS_IE_32");
291 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
292
293 case BFD_RELOC_386_TLS_LE_32:
294 TRACE ("BFD_RELOC_386_TLS_LE_32");
295 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_DTPMOD32:
298 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
299 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_DTPOFF32:
302 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
303 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_TPOFF32:
306 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
307 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
308
309 case BFD_RELOC_SIZE32:
310 TRACE ("BFD_RELOC_SIZE32");
311 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_GOTDESC:
314 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
315 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
316
317 case BFD_RELOC_386_TLS_DESC_CALL:
318 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
319 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_DESC:
322 TRACE ("BFD_RELOC_386_TLS_DESC");
323 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_IRELATIVE:
326 TRACE ("BFD_RELOC_386_IRELATIVE");
327 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
328
329 case BFD_RELOC_386_GOT32X:
330 TRACE ("BFD_RELOC_386_GOT32X");
331 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
332
333 case BFD_RELOC_VTABLE_INHERIT:
334 TRACE ("BFD_RELOC_VTABLE_INHERIT");
335 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
336
337 case BFD_RELOC_VTABLE_ENTRY:
338 TRACE ("BFD_RELOC_VTABLE_ENTRY");
339 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
340
341 default:
342 TRACE ("Unknown");
343 /* xgettext:c-format */
344 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
345 abfd, (int) code);
346 bfd_set_error (bfd_error_bad_value);
347 return NULL;
348 }
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_ext2 - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
376 >= R_386_vt - R_386_ext2))
377 return NULL;
378 /* PR 17512: file: 0f67f69d. */
379 if (elf_howto_table [indx].type != r_type)
380 return NULL;
381 return &elf_howto_table[indx];
382 }
383
384 static bool
385 elf_i386_info_to_howto_rel (bfd *abfd,
386 arelent *cache_ptr,
387 Elf_Internal_Rela *dst)
388 {
389 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
390
391 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
392 {
393 /* xgettext:c-format */
394 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
395 abfd, r_type);
396 bfd_set_error (bfd_error_bad_value);
397 return false;
398 }
399
400 return true;
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 bool
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 bool
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 bool
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_scan_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 NULL, /* plt_tlsdesc_entry */
763 0, /* plt_tlsdesc_entry_size*/
764 0, /* plt_tlsdesc_got1_offset */
765 0, /* plt_tlsdesc_got2_offset */
766 0, /* plt_tlsdesc_got1_insn_end */
767 0, /* plt_tlsdesc_got2_insn_end */
768 2, /* plt0_got1_offset */
769 8, /* plt0_got2_offset */
770 0, /* plt0_got2_insn_end */
771 2, /* plt_got_offset */
772 7, /* plt_reloc_offset */
773 12, /* plt_plt_offset */
774 0, /* plt_got_insn_size */
775 0, /* plt_plt_insn_end */
776 6, /* plt_lazy_offset */
777 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
778 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
779 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
780 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
781 };
782
783 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
784 {
785 elf_i386_non_lazy_plt_entry, /* plt_entry */
786 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
787 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
788 2, /* plt_got_offset */
789 0, /* plt_got_insn_size */
790 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
791 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
792 };
793
794 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
795 {
796 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
797 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
798 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
799 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
800 NULL, /* plt_tlsdesc_entry */
801 0, /* plt_tlsdesc_entry_size*/
802 0, /* plt_tlsdesc_got1_offset */
803 0, /* plt_tlsdesc_got2_offset */
804 0, /* plt_tlsdesc_got1_insn_end */
805 0, /* plt_tlsdesc_got2_insn_end */
806 2, /* plt0_got1_offset */
807 8, /* plt0_got2_offset */
808 0, /* plt0_got2_insn_end */
809 4+2, /* plt_got_offset */
810 4+1, /* plt_reloc_offset */
811 4+6, /* plt_plt_offset */
812 0, /* plt_got_insn_size */
813 0, /* plt_plt_insn_end */
814 0, /* plt_lazy_offset */
815 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
816 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
817 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
818 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
819 };
820
821 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
822 {
823 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
824 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
825 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
826 4+2, /* plt_got_offset */
827 0, /* plt_got_insn_size */
828 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
829 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
830 };
831 \f
832
833 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
834 for the PLTResolve stub and then for each PLT entry. */
835 #define PLTRESOLVE_RELOCS_SHLIB 0
836 #define PLTRESOLVE_RELOCS 2
837 #define PLT_NON_JUMP_SLOT_RELOCS 2
838
839 /* Return TRUE if the TLS access code sequence support transition
840 from R_TYPE. */
841
842 static bool
843 elf_i386_check_tls_transition (asection *sec,
844 bfd_byte *contents,
845 Elf_Internal_Shdr *symtab_hdr,
846 struct elf_link_hash_entry **sym_hashes,
847 unsigned int r_type,
848 const Elf_Internal_Rela *rel,
849 const Elf_Internal_Rela *relend)
850 {
851 unsigned int val, type, reg;
852 unsigned long r_symndx;
853 struct elf_link_hash_entry *h;
854 bfd_vma offset;
855 bfd_byte *call;
856 bool indirect_call;
857
858 offset = rel->r_offset;
859 switch (r_type)
860 {
861 case R_386_TLS_GD:
862 case R_386_TLS_LDM:
863 if (offset < 2 || (rel + 1) >= relend)
864 return false;
865
866 indirect_call = false;
867 call = contents + offset + 4;
868 val = *(call - 5);
869 type = *(call - 6);
870 if (r_type == R_386_TLS_GD)
871 {
872 /* Check transition from GD access model. Only
873 leal foo@tlsgd(,%ebx,1), %eax
874 call ___tls_get_addr@PLT
875 or
876 leal foo@tlsgd(%ebx) %eax
877 call ___tls_get_addr@PLT
878 nop
879 or
880 leal foo@tlsgd(%reg), %eax
881 call *___tls_get_addr@GOT(%reg)
882 which may be converted to
883 addr32 call ___tls_get_addr
884 can transit to different access model. */
885 if ((offset + 10) > sec->size
886 || (type != 0x8d && type != 0x04))
887 return false;
888
889 if (type == 0x04)
890 {
891 /* leal foo@tlsgd(,%ebx,1), %eax
892 call ___tls_get_addr@PLT */
893 if (offset < 3)
894 return false;
895
896 if (*(call - 7) != 0x8d
897 || val != 0x1d
898 || call[0] != 0xe8)
899 return false;
900 }
901 else
902 {
903 /* This must be
904 leal foo@tlsgd(%ebx), %eax
905 call ___tls_get_addr@PLT
906 nop
907 or
908 leal foo@tlsgd(%reg), %eax
909 call *___tls_get_addr@GOT(%reg)
910 which may be converted to
911 addr32 call ___tls_get_addr
912
913 %eax can't be used as the GOT base register since it
914 is used to pass parameter to ___tls_get_addr. */
915 reg = val & 7;
916 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
917 return false;
918
919 indirect_call = call[0] == 0xff;
920 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
921 && !(call[0] == 0x67 && call[1] == 0xe8)
922 && !(indirect_call
923 && (call[1] & 0xf8) == 0x90
924 && (call[1] & 0x7) == reg))
925 return false;
926 }
927 }
928 else
929 {
930 /* Check transition from LD access model. Only
931 leal foo@tlsldm(%ebx), %eax
932 call ___tls_get_addr@PLT
933 or
934 leal foo@tlsldm(%reg), %eax
935 call *___tls_get_addr@GOT(%reg)
936 which may be converted to
937 addr32 call ___tls_get_addr
938 can transit to different access model. */
939 if (type != 0x8d || (offset + 9) > sec->size)
940 return false;
941
942 /* %eax can't be used as the GOT base register since it is
943 used to pass parameter to ___tls_get_addr. */
944 reg = val & 7;
945 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
946 return false;
947
948 indirect_call = call[0] == 0xff;
949 if (!(reg == 3 && call[0] == 0xe8)
950 && !(call[0] == 0x67 && call[1] == 0xe8)
951 && !(indirect_call
952 && (call[1] & 0xf8) == 0x90
953 && (call[1] & 0x7) == reg))
954 return false;
955 }
956
957 r_symndx = ELF32_R_SYM (rel[1].r_info);
958 if (r_symndx < symtab_hdr->sh_info)
959 return false;
960
961 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
962 if (h == NULL
963 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
964 return false;
965 else if (indirect_call)
966 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X
967 || ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32);
968 else
969 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
970 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
971
972 case R_386_TLS_IE:
973 /* Check transition from IE access model:
974 movl foo@indntpoff(%rip), %eax
975 movl foo@indntpoff(%rip), %reg
976 addl foo@indntpoff(%rip), %reg
977 */
978
979 if (offset < 1 || (offset + 4) > sec->size)
980 return false;
981
982 /* Check "movl foo@tpoff(%rip), %eax" first. */
983 val = bfd_get_8 (abfd, contents + offset - 1);
984 if (val == 0xa1)
985 return true;
986
987 if (offset < 2)
988 return false;
989
990 /* Check movl|addl foo@tpoff(%rip), %reg. */
991 type = bfd_get_8 (abfd, contents + offset - 2);
992 return ((type == 0x8b || type == 0x03)
993 && (val & 0xc7) == 0x05);
994
995 case R_386_TLS_GOTIE:
996 case R_386_TLS_IE_32:
997 /* Check transition from {IE_32,GOTIE} access model:
998 subl foo@{tpoff,gontoff}(%reg1), %reg2
999 movl foo@{tpoff,gontoff}(%reg1), %reg2
1000 addl foo@{tpoff,gontoff}(%reg1), %reg2
1001 */
1002
1003 if (offset < 2 || (offset + 4) > sec->size)
1004 return false;
1005
1006 val = bfd_get_8 (abfd, contents + offset - 1);
1007 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1008 return false;
1009
1010 type = bfd_get_8 (abfd, contents + offset - 2);
1011 return type == 0x8b || type == 0x2b || type == 0x03;
1012
1013 case R_386_TLS_GOTDESC:
1014 /* Check transition from GDesc access model:
1015 leal x@tlsdesc(%ebx), %eax
1016
1017 Make sure it's a leal adding ebx to a 32-bit offset
1018 into any register, although it's probably almost always
1019 going to be eax. */
1020
1021 if (offset < 2 || (offset + 4) > sec->size)
1022 return false;
1023
1024 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1025 return false;
1026
1027 val = bfd_get_8 (abfd, contents + offset - 1);
1028 return (val & 0xc7) == 0x83;
1029
1030 case R_386_TLS_DESC_CALL:
1031 /* Check transition from GDesc access model:
1032 call *x@tlsdesc(%eax)
1033 */
1034 if (offset + 2 <= sec->size)
1035 {
1036 /* Make sure that it's a call *x@tlsdesc(%eax). */
1037 call = contents + offset;
1038 return call[0] == 0xff && call[1] == 0x10;
1039 }
1040
1041 return false;
1042
1043 default:
1044 abort ();
1045 }
1046 }
1047
1048 /* Return TRUE if the TLS access transition is OK or no transition
1049 will be performed. Update R_TYPE if there is a transition. */
1050
1051 static bool
1052 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1053 asection *sec, bfd_byte *contents,
1054 Elf_Internal_Shdr *symtab_hdr,
1055 struct elf_link_hash_entry **sym_hashes,
1056 unsigned int *r_type, int tls_type,
1057 const Elf_Internal_Rela *rel,
1058 const Elf_Internal_Rela *relend,
1059 struct elf_link_hash_entry *h,
1060 unsigned long r_symndx,
1061 bool from_relocate_section)
1062 {
1063 unsigned int from_type = *r_type;
1064 unsigned int to_type = from_type;
1065 bool check = true;
1066 unsigned int to_le_type, to_ie_type;
1067
1068 /* Skip TLS transition for functions. */
1069 if (h != NULL
1070 && (h->type == STT_FUNC
1071 || h->type == STT_GNU_IFUNC))
1072 return true;
1073
1074 if (get_elf_backend_data (abfd)->target_os == is_solaris)
1075 {
1076 /* NB: Solaris only supports R_386_TLS_LE and R_386_TLS_IE. */
1077 to_le_type = R_386_TLS_LE;
1078 to_ie_type = R_386_TLS_IE;
1079 }
1080 else
1081 {
1082 to_le_type = R_386_TLS_LE_32;
1083 to_ie_type = R_386_TLS_IE_32;
1084 }
1085
1086 switch (from_type)
1087 {
1088 case R_386_TLS_GD:
1089 case R_386_TLS_GOTDESC:
1090 case R_386_TLS_DESC_CALL:
1091 case R_386_TLS_IE_32:
1092 case R_386_TLS_IE:
1093 case R_386_TLS_GOTIE:
1094 if (bfd_link_executable (info))
1095 {
1096 if (h == NULL)
1097 to_type = to_le_type;
1098 else if (from_type != R_386_TLS_IE
1099 && from_type != R_386_TLS_GOTIE)
1100 to_type = to_ie_type;
1101 }
1102
1103 /* When we are called from elf_i386_relocate_section, there may
1104 be additional transitions based on TLS_TYPE. */
1105 if (from_relocate_section)
1106 {
1107 unsigned int new_to_type = to_type;
1108
1109 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1110 new_to_type = to_le_type;
1111
1112 if (to_type == R_386_TLS_GD
1113 || to_type == R_386_TLS_GOTDESC
1114 || to_type == R_386_TLS_DESC_CALL)
1115 {
1116 if (tls_type == GOT_TLS_IE_POS)
1117 new_to_type = R_386_TLS_GOTIE;
1118 else if (tls_type & GOT_TLS_IE)
1119 new_to_type = to_ie_type;
1120 }
1121
1122 /* We checked the transition before when we were called from
1123 elf_i386_scan_relocs. We only want to check the new
1124 transition which hasn't been checked before. */
1125 check = new_to_type != to_type && from_type == to_type;
1126 to_type = new_to_type;
1127 }
1128
1129 break;
1130
1131 case R_386_TLS_LDM:
1132 if (bfd_link_executable (info))
1133 to_type = to_le_type;
1134 break;
1135
1136 default:
1137 return true;
1138 }
1139
1140 /* Return TRUE if there is no transition. */
1141 if (from_type == to_type)
1142 return true;
1143
1144 /* Check if the transition can be performed. */
1145 if (check
1146 && ! elf_i386_check_tls_transition (sec, contents,
1147 symtab_hdr, sym_hashes,
1148 from_type, rel, relend))
1149 {
1150 reloc_howto_type *from, *to;
1151 const char *name;
1152
1153 from = elf_i386_rtype_to_howto (from_type);
1154 to = elf_i386_rtype_to_howto (to_type);
1155
1156 if (h)
1157 name = h->root.root.string;
1158 else
1159 {
1160 struct elf_x86_link_hash_table *htab;
1161
1162 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1163 if (htab == NULL)
1164 name = "*unknown*";
1165 else
1166 {
1167 Elf_Internal_Sym *isym;
1168
1169 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1170 abfd, r_symndx);
1171 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1172 }
1173 }
1174
1175 _bfd_error_handler
1176 /* xgettext:c-format */
1177 (_("%pB: TLS transition from %s to %s against `%s'"
1178 " at %#" PRIx64 " in section `%pA' failed"),
1179 abfd, from->name, to->name, name,
1180 (uint64_t) rel->r_offset, sec);
1181 bfd_set_error (bfd_error_bad_value);
1182 return false;
1183 }
1184
1185 *r_type = to_type;
1186 return true;
1187 }
1188
1189 /* With the local symbol, foo, we convert
1190 mov foo@GOT[(%reg1)], %reg2
1191 to
1192 lea foo[@GOTOFF(%reg1)], %reg2
1193 and convert
1194 call/jmp *foo@GOT[(%reg)]
1195 to
1196 nop call foo/jmp foo nop
1197 When PIC is false, convert
1198 test %reg1, foo@GOT[(%reg2)]
1199 to
1200 test $foo, %reg1
1201 and convert
1202 binop foo@GOT[(%reg1)], %reg2
1203 to
1204 binop $foo, %reg2
1205 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1206 instructions. */
1207
1208 static
1209 bool
1210 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1211 bfd_byte *contents,
1212 unsigned int *r_type_p,
1213 Elf_Internal_Rela *irel,
1214 struct elf_link_hash_entry *h,
1215 bool *converted,
1216 struct bfd_link_info *link_info)
1217 {
1218 struct elf_x86_link_hash_table *htab;
1219 unsigned int opcode;
1220 unsigned int modrm;
1221 bool baseless;
1222 Elf_Internal_Sym *isym;
1223 unsigned int addend;
1224 unsigned int nop;
1225 bfd_vma nop_offset;
1226 bool is_pic;
1227 bool to_reloc_32;
1228 bool abs_symbol;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bool local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1234
1235 if (roff < 2)
1236 return true;
1237
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1240 if (addend != 0)
1241 return true;
1242
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 if (htab == NULL || ! is_x86_elf (abfd, htab))
1245 {
1246 bfd_set_error (bfd_error_wrong_format);
1247 return false;
1248 }
1249
1250 is_pic = bfd_link_pic (link_info);
1251
1252 r_type = *r_type_p;
1253 r_symndx = ELF32_R_SYM (irel->r_info);
1254
1255 modrm = bfd_get_8 (abfd, contents + roff - 1);
1256 baseless = (modrm & 0xc7) == 0x5;
1257
1258 if (h)
1259 {
1260 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1261 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1262 isym = NULL;
1263 abs_symbol = ABS_SYMBOL_P (h);
1264 }
1265 else
1266 {
1267 local_ref = true;
1268 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1269 r_symndx);
1270 abs_symbol = isym->st_shndx == SHN_ABS;
1271 }
1272
1273 if (baseless && is_pic)
1274 {
1275 /* For PIC, disallow R_386_GOT32X without a base register
1276 since we don't know what the GOT base is. */
1277 const char *name;
1278
1279 if (h == NULL)
1280 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1281 else
1282 name = h->root.root.string;
1283
1284 _bfd_error_handler
1285 /* xgettext:c-format */
1286 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1287 " register can not be used when making a shared object"),
1288 abfd, name);
1289 return false;
1290 }
1291
1292 opcode = bfd_get_8 (abfd, contents + roff - 2);
1293
1294 /* Convert to R_386_32 if PIC is false or there is no base
1295 register. */
1296 to_reloc_32 = !is_pic || baseless;
1297
1298 eh = elf_x86_hash_entry (h);
1299
1300 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1301 reloc. */
1302 if (h == NULL)
1303 {
1304 if (opcode == 0x0ff)
1305 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1306 goto convert_branch;
1307 else
1308 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1309 "test %reg1, foo@GOT(%reg2)" and
1310 "binop foo@GOT[(%reg1)], %reg2". */
1311 goto convert_load;
1312 }
1313
1314 /* Undefined weak symbol is only bound locally in executable
1315 and its reference is resolved as 0. */
1316 if (h->root.type == bfd_link_hash_undefweak
1317 && !eh->linker_def
1318 && local_ref)
1319 {
1320 if (opcode == 0xff)
1321 {
1322 /* No direct branch to 0 for PIC. */
1323 if (is_pic)
1324 return true;
1325 else
1326 goto convert_branch;
1327 }
1328 else
1329 {
1330 /* We can convert load of address 0 to R_386_32. */
1331 to_reloc_32 = true;
1332 goto convert_load;
1333 }
1334 }
1335
1336 if (opcode == 0xff)
1337 {
1338 /* We have "call/jmp *foo@GOT[(%reg)]". */
1339 if ((h->root.type == bfd_link_hash_defined
1340 || h->root.type == bfd_link_hash_defweak)
1341 && local_ref)
1342 {
1343 /* The function is locally defined. */
1344 convert_branch:
1345 /* Convert R_386_GOT32X to R_386_PC32. */
1346 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1347 {
1348 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1349 is a nop prefix. */
1350 modrm = 0xe8;
1351 /* To support TLS optimization, always use addr32 prefix
1352 for "call *___tls_get_addr@GOT(%reg)". */
1353 if (eh && eh->tls_get_addr)
1354 {
1355 nop = 0x67;
1356 nop_offset = irel->r_offset - 2;
1357 }
1358 else
1359 {
1360 nop = htab->params->call_nop_byte;
1361 if (htab->params->call_nop_as_suffix)
1362 {
1363 nop_offset = roff + 3;
1364 irel->r_offset -= 1;
1365 }
1366 else
1367 nop_offset = roff - 2;
1368 }
1369 }
1370 else
1371 {
1372 /* Convert to "jmp foo nop". */
1373 modrm = 0xe9;
1374 nop = NOP_OPCODE;
1375 nop_offset = roff + 3;
1376 irel->r_offset -= 1;
1377 }
1378
1379 bfd_put_8 (abfd, nop, contents + nop_offset);
1380 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1381 /* When converting to PC-relative relocation, we
1382 need to adjust addend by -4. */
1383 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1384 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1385 *r_type_p = R_386_PC32;
1386 *converted = true;
1387 }
1388 }
1389 else
1390 {
1391 /* We have "mov foo@GOT[(%re1g)], %reg2",
1392 "test %reg1, foo@GOT(%reg2)" and
1393 "binop foo@GOT[(%reg1)], %reg2".
1394
1395 Avoid optimizing _DYNAMIC since ld.so may use its
1396 link-time address. */
1397 if (h == htab->elf.hdynamic)
1398 return true;
1399
1400 /* def_regular is set by an assignment in a linker script in
1401 bfd_elf_record_link_assignment. start_stop is set on
1402 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1403 if (h->start_stop
1404 || eh->linker_def
1405 || ((h->def_regular
1406 || h->root.type == bfd_link_hash_defined
1407 || h->root.type == bfd_link_hash_defweak)
1408 && local_ref))
1409 {
1410 convert_load:
1411 if (opcode == 0x8b)
1412 {
1413 if (abs_symbol && local_ref)
1414 to_reloc_32 = true;
1415
1416 if (to_reloc_32)
1417 {
1418 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1419 "mov $foo, %reg2" with R_386_32. */
1420 r_type = R_386_32;
1421 modrm = 0xc0 | (modrm & 0x38) >> 3;
1422 bfd_put_8 (abfd, modrm, contents + roff - 1);
1423 opcode = 0xc7;
1424 }
1425 else
1426 {
1427 /* Convert "mov foo@GOT(%reg1), %reg2" to
1428 "lea foo@GOTOFF(%reg1), %reg2". */
1429 r_type = R_386_GOTOFF;
1430 opcode = 0x8d;
1431 }
1432 }
1433 else
1434 {
1435 /* Only R_386_32 is supported. */
1436 if (!to_reloc_32)
1437 return true;
1438
1439 if (opcode == 0x85)
1440 {
1441 /* Convert "test %reg1, foo@GOT(%reg2)" to
1442 "test $foo, %reg1". */
1443 modrm = 0xc0 | (modrm & 0x38) >> 3;
1444 opcode = 0xf7;
1445 }
1446 else
1447 {
1448 /* Convert "binop foo@GOT(%reg1), %reg2" to
1449 "binop $foo, %reg2". */
1450 modrm = (0xc0
1451 | (modrm & 0x38) >> 3
1452 | (opcode & 0x3c));
1453 opcode = 0x81;
1454 }
1455 bfd_put_8 (abfd, modrm, contents + roff - 1);
1456 r_type = R_386_32;
1457 }
1458
1459 bfd_put_8 (abfd, opcode, contents + roff - 2);
1460 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1461 *r_type_p = r_type;
1462 *converted = true;
1463 }
1464 }
1465
1466 return true;
1467 }
1468
1469 /* Look through the relocs for a section during the first phase, and
1470 calculate needed space in the global offset table, and procedure
1471 linkage table. */
1472
1473 static bool
1474 elf_i386_scan_relocs (bfd *abfd,
1475 struct bfd_link_info *info,
1476 asection *sec,
1477 const Elf_Internal_Rela *relocs)
1478 {
1479 struct elf_x86_link_hash_table *htab;
1480 Elf_Internal_Shdr *symtab_hdr;
1481 struct elf_link_hash_entry **sym_hashes;
1482 const Elf_Internal_Rela *rel;
1483 const Elf_Internal_Rela *rel_end;
1484 bfd_byte *contents;
1485 bool converted;
1486
1487 if (bfd_link_relocatable (info))
1488 return true;
1489
1490 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1491 if (htab == NULL)
1492 {
1493 sec->check_relocs_failed = 1;
1494 return false;
1495 }
1496
1497 BFD_ASSERT (is_x86_elf (abfd, htab));
1498
1499 /* Get the section contents. */
1500 if (elf_section_data (sec)->this_hdr.contents != NULL)
1501 contents = elf_section_data (sec)->this_hdr.contents;
1502 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1503 {
1504 sec->check_relocs_failed = 1;
1505 return false;
1506 }
1507
1508 symtab_hdr = &elf_symtab_hdr (abfd);
1509 sym_hashes = elf_sym_hashes (abfd);
1510
1511 converted = false;
1512
1513 rel_end = relocs + sec->reloc_count;
1514 for (rel = relocs; rel < rel_end; rel++)
1515 {
1516 unsigned int r_type;
1517 unsigned int r_symndx;
1518 struct elf_link_hash_entry *h;
1519 struct elf_x86_link_hash_entry *eh;
1520 Elf_Internal_Sym *isym;
1521 const char *name;
1522 bool size_reloc;
1523 bool no_dynreloc;
1524
1525 r_symndx = ELF32_R_SYM (rel->r_info);
1526 r_type = ELF32_R_TYPE (rel->r_info);
1527
1528 /* Don't check R_386_NONE. */
1529 if (r_type == R_386_NONE)
1530 continue;
1531
1532 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1533 {
1534 /* xgettext:c-format */
1535 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1536 abfd, r_symndx);
1537 goto error_return;
1538 }
1539
1540 if (r_symndx < symtab_hdr->sh_info)
1541 {
1542 /* A local symbol. */
1543 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1544 abfd, r_symndx);
1545 if (isym == NULL)
1546 goto error_return;
1547
1548 /* Check relocation against local STT_GNU_IFUNC symbol. */
1549 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1550 {
1551 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1552 if (h == NULL)
1553 goto error_return;
1554
1555 /* Fake a STT_GNU_IFUNC symbol. */
1556 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1557 isym, NULL);
1558 h->type = STT_GNU_IFUNC;
1559 h->def_regular = 1;
1560 h->ref_regular = 1;
1561 h->forced_local = 1;
1562 h->root.type = bfd_link_hash_defined;
1563 }
1564 else
1565 h = NULL;
1566 }
1567 else
1568 {
1569 isym = NULL;
1570 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1571 while (h->root.type == bfd_link_hash_indirect
1572 || h->root.type == bfd_link_hash_warning)
1573 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1574 }
1575
1576 eh = (struct elf_x86_link_hash_entry *) h;
1577 if (h != NULL)
1578 {
1579 if (r_type == R_386_GOTOFF)
1580 eh->gotoff_ref = 1;
1581
1582 /* It is referenced by a non-shared object. */
1583 h->ref_regular = 1;
1584 }
1585
1586 if (r_type == R_386_GOT32X
1587 && (h == NULL || h->type != STT_GNU_IFUNC))
1588 {
1589 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1590 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1591 &r_type, irel, h,
1592 &converted, info))
1593 goto error_return;
1594 }
1595
1596 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1597 symtab_hdr, &no_dynreloc))
1598 return false;
1599
1600 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1601 symtab_hdr, sym_hashes,
1602 &r_type, GOT_UNKNOWN,
1603 rel, rel_end, h, r_symndx, false))
1604 goto error_return;
1605
1606 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1607 if (h == htab->elf.hgot)
1608 htab->got_referenced = true;
1609
1610 switch (r_type)
1611 {
1612 case R_386_TLS_LDM:
1613 htab->tls_ld_or_ldm_got.refcount = 1;
1614 goto create_got;
1615
1616 case R_386_PLT32:
1617 /* This symbol requires a procedure linkage table entry. We
1618 actually build the entry in adjust_dynamic_symbol,
1619 because this might be a case of linking PIC code which is
1620 never referenced by a dynamic object, in which case we
1621 don't need to generate a procedure linkage table entry
1622 after all. */
1623
1624 /* If this is a local symbol, we resolve it directly without
1625 creating a procedure linkage table entry. */
1626 if (h == NULL)
1627 continue;
1628
1629 eh->zero_undefweak &= 0x2;
1630 h->needs_plt = 1;
1631 h->plt.refcount = 1;
1632 break;
1633
1634 case R_386_SIZE32:
1635 size_reloc = true;
1636 goto do_size;
1637
1638 case R_386_TLS_IE_32:
1639 case R_386_TLS_IE:
1640 case R_386_TLS_GOTIE:
1641 if (!bfd_link_executable (info))
1642 info->flags |= DF_STATIC_TLS;
1643 /* Fall through */
1644
1645 case R_386_GOT32:
1646 case R_386_GOT32X:
1647 case R_386_TLS_GD:
1648 case R_386_TLS_GOTDESC:
1649 case R_386_TLS_DESC_CALL:
1650 /* This symbol requires a global offset table entry. */
1651 {
1652 int tls_type, old_tls_type;
1653
1654 switch (r_type)
1655 {
1656 default:
1657 case R_386_GOT32:
1658 case R_386_GOT32X:
1659 tls_type = GOT_NORMAL;
1660 break;
1661 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1662 case R_386_TLS_GOTDESC:
1663 case R_386_TLS_DESC_CALL:
1664 tls_type = GOT_TLS_GDESC; break;
1665 case R_386_TLS_IE_32:
1666 if (ELF32_R_TYPE (rel->r_info) == r_type)
1667 tls_type = GOT_TLS_IE_NEG;
1668 else
1669 /* If this is a GD->IE transition, we may use either of
1670 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1671 tls_type = GOT_TLS_IE;
1672 break;
1673 case R_386_TLS_IE:
1674 case R_386_TLS_GOTIE:
1675 tls_type = GOT_TLS_IE_POS; break;
1676 }
1677
1678 if (h != NULL)
1679 {
1680 h->got.refcount = 1;
1681 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1682 }
1683 else
1684 {
1685 bfd_signed_vma *local_got_refcounts;
1686
1687 if (!elf_x86_allocate_local_got_info (abfd,
1688 symtab_hdr->sh_info))
1689 goto error_return;
1690
1691 /* This is a global offset table entry for a local symbol. */
1692 local_got_refcounts = elf_local_got_refcounts (abfd);
1693 local_got_refcounts[r_symndx] = 1;
1694 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1695 }
1696
1697 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1698 tls_type |= old_tls_type;
1699 /* If a TLS symbol is accessed using IE at least once,
1700 there is no point to use dynamic model for it. */
1701 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1702 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1703 || (tls_type & GOT_TLS_IE) == 0))
1704 {
1705 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1706 tls_type = old_tls_type;
1707 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1708 && GOT_TLS_GD_ANY_P (tls_type))
1709 tls_type |= old_tls_type;
1710 else
1711 {
1712 if (h)
1713 name = h->root.root.string;
1714 else
1715 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1716 NULL);
1717 _bfd_error_handler
1718 /* xgettext:c-format */
1719 (_("%pB: `%s' accessed both as normal and "
1720 "thread local symbol"),
1721 abfd, name);
1722 bfd_set_error (bfd_error_bad_value);
1723 goto error_return;
1724 }
1725 }
1726
1727 if (old_tls_type != tls_type)
1728 {
1729 if (h != NULL)
1730 elf_x86_hash_entry (h)->tls_type = tls_type;
1731 else
1732 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1733 }
1734 }
1735 /* Fall through */
1736
1737 case R_386_GOTOFF:
1738 case R_386_GOTPC:
1739 create_got:
1740 if (r_type != R_386_TLS_IE)
1741 {
1742 if (eh != NULL)
1743 {
1744 eh->zero_undefweak &= 0x2;
1745
1746 /* Need GOT to resolve undefined weak symbol to 0. */
1747 if (r_type == R_386_GOTOFF
1748 && h->root.type == bfd_link_hash_undefweak
1749 && bfd_link_executable (info))
1750 htab->got_referenced = true;
1751 }
1752 break;
1753 }
1754 /* Fall through */
1755
1756 case R_386_TLS_LE_32:
1757 case R_386_TLS_LE:
1758 if (eh != NULL)
1759 eh->zero_undefweak &= 0x2;
1760 if (bfd_link_executable (info))
1761 break;
1762 info->flags |= DF_STATIC_TLS;
1763 goto do_relocation;
1764
1765 case R_386_32:
1766 case R_386_PC32:
1767 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1768 eh->zero_undefweak |= 0x2;
1769 do_relocation:
1770 /* We are called after all symbols have been resolved. Only
1771 relocation against STT_GNU_IFUNC symbol must go through
1772 PLT. */
1773 if (h != NULL
1774 && (bfd_link_executable (info)
1775 || h->type == STT_GNU_IFUNC))
1776 {
1777 bool func_pointer_ref = false;
1778
1779 if (r_type == R_386_PC32)
1780 {
1781 /* Since something like ".long foo - ." may be used
1782 as pointer, make sure that PLT is used if foo is
1783 a function defined in a shared library. */
1784 if ((sec->flags & SEC_CODE) == 0)
1785 h->pointer_equality_needed = 1;
1786 else if (h->type == STT_GNU_IFUNC
1787 && bfd_link_pic (info))
1788 {
1789 _bfd_error_handler
1790 /* xgettext:c-format */
1791 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1792 abfd, h->root.root.string);
1793 bfd_set_error (bfd_error_bad_value);
1794 goto error_return;
1795 }
1796 }
1797 else
1798 {
1799 /* R_386_32 can be resolved at run-time. Function
1800 pointer reference doesn't need PLT for pointer
1801 equality. */
1802 if (r_type == R_386_32
1803 && (sec->flags & SEC_READONLY) == 0)
1804 func_pointer_ref = true;
1805
1806 /* IFUNC symbol needs pointer equality in PDE so that
1807 function pointer reference will be resolved to its
1808 PLT entry directly. */
1809 if (!func_pointer_ref
1810 || (bfd_link_pde (info)
1811 && h->type == STT_GNU_IFUNC))
1812 h->pointer_equality_needed = 1;
1813 }
1814
1815 if (!func_pointer_ref)
1816 {
1817 /* If this reloc is in a read-only section, we might
1818 need a copy reloc. We can't check reliably at this
1819 stage whether the section is read-only, as input
1820 sections have not yet been mapped to output sections.
1821 Tentatively set the flag for now, and correct in
1822 adjust_dynamic_symbol. */
1823 h->non_got_ref = 1;
1824
1825 if (!elf_has_indirect_extern_access (sec->owner))
1826 eh->non_got_ref_without_indirect_extern_access = 1;
1827
1828 /* We may need a .plt entry if the symbol is a function
1829 defined in a shared lib or is a function referenced
1830 from the code or read-only section. */
1831 if (!h->def_regular
1832 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1833 h->plt.refcount = 1;
1834
1835 if (htab->elf.target_os != is_solaris
1836 && h->pointer_equality_needed
1837 && h->type == STT_FUNC
1838 && eh->def_protected
1839 && !SYMBOL_DEFINED_NON_SHARED_P (h)
1840 && h->def_dynamic)
1841 {
1842 /* Disallow non-canonical reference to canonical
1843 protected function. */
1844 _bfd_error_handler
1845 /* xgettext:c-format */
1846 (_("%pB: non-canonical reference to canonical "
1847 "protected function `%s' in %pB"),
1848 abfd, h->root.root.string,
1849 h->root.u.def.section->owner);
1850 bfd_set_error (bfd_error_bad_value);
1851 goto error_return;
1852 }
1853 }
1854 }
1855
1856 size_reloc = false;
1857 do_size:
1858 if (!no_dynreloc
1859 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
1860 r_type, R_386_32))
1861 {
1862 struct elf_dyn_relocs *p;
1863 struct elf_dyn_relocs **head;
1864
1865 /* If this is a global symbol, we count the number of
1866 relocations we need for this symbol. */
1867 if (h != NULL)
1868 {
1869 head = &h->dyn_relocs;
1870 }
1871 else
1872 {
1873 /* Track dynamic relocs needed for local syms too.
1874 We really need local syms available to do this
1875 easily. Oh well. */
1876 void **vpp;
1877 asection *s;
1878
1879 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1880 abfd, r_symndx);
1881 if (isym == NULL)
1882 goto error_return;
1883
1884 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1885 if (s == NULL)
1886 s = sec;
1887
1888 vpp = &elf_section_data (s)->local_dynrel;
1889 head = (struct elf_dyn_relocs **)vpp;
1890 }
1891
1892 p = *head;
1893 if (p == NULL || p->sec != sec)
1894 {
1895 size_t amt = sizeof *p;
1896 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1897 amt);
1898 if (p == NULL)
1899 goto error_return;
1900 p->next = *head;
1901 *head = p;
1902 p->sec = sec;
1903 p->count = 0;
1904 p->pc_count = 0;
1905 }
1906
1907 p->count += 1;
1908 /* Count size relocation as PC-relative relocation. */
1909 if (r_type == R_386_PC32 || size_reloc)
1910 p->pc_count += 1;
1911 }
1912 break;
1913
1914 /* This relocation describes the C++ object vtable hierarchy.
1915 Reconstruct it for later use during GC. */
1916 case R_386_GNU_VTINHERIT:
1917 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1918 goto error_return;
1919 break;
1920
1921 /* This relocation describes which C++ vtable entries are actually
1922 used. Record for later use during GC. */
1923 case R_386_GNU_VTENTRY:
1924 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1925 goto error_return;
1926 break;
1927
1928 default:
1929 break;
1930 }
1931 }
1932
1933 if (elf_section_data (sec)->this_hdr.contents != contents)
1934 {
1935 if (!converted && !_bfd_link_keep_memory (info))
1936 free (contents);
1937 else
1938 {
1939 /* Cache the section contents for elf_link_input_bfd if any
1940 load is converted or --no-keep-memory isn't used. */
1941 elf_section_data (sec)->this_hdr.contents = contents;
1942 info->cache_size += sec->size;
1943 }
1944 }
1945
1946 /* Cache relocations if any load is converted. */
1947 if (elf_section_data (sec)->relocs != relocs && converted)
1948 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1949
1950 return true;
1951
1952 error_return:
1953 if (elf_section_data (sec)->this_hdr.contents != contents)
1954 free (contents);
1955 sec->check_relocs_failed = 1;
1956 return false;
1957 }
1958
1959 static bool
1960 elf_i386_always_size_sections (bfd *output_bfd,
1961 struct bfd_link_info *info)
1962 {
1963 bfd *abfd;
1964
1965 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
1966 for (abfd = info->input_bfds;
1967 abfd != (bfd *) NULL;
1968 abfd = abfd->link.next)
1969 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
1970 && !_bfd_elf_link_iterate_on_relocs (abfd, info,
1971 elf_i386_scan_relocs))
1972 return false;
1973
1974 return _bfd_x86_elf_always_size_sections (output_bfd, info);
1975 }
1976
1977 /* Set the correct type for an x86 ELF section. We do this by the
1978 section name, which is a hack, but ought to work. */
1979
1980 static bool
1981 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1982 Elf_Internal_Shdr *hdr,
1983 asection *sec)
1984 {
1985 const char *name;
1986
1987 name = bfd_section_name (sec);
1988
1989 /* This is an ugly, but unfortunately necessary hack that is
1990 needed when producing EFI binaries on x86. It tells
1991 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1992 containing ELF relocation info. We need this hack in order to
1993 be able to generate ELF binaries that can be translated into
1994 EFI applications (which are essentially COFF objects). Those
1995 files contain a COFF ".reloc" section inside an ELFNN object,
1996 which would normally cause BFD to segfault because it would
1997 attempt to interpret this section as containing relocation
1998 entries for section "oc". With this hack enabled, ".reloc"
1999 will be treated as a normal data section, which will avoid the
2000 segfault. However, you won't be able to create an ELFNN binary
2001 with a section named "oc" that needs relocations, but that's
2002 the kind of ugly side-effects you get when detecting section
2003 types based on their names... In practice, this limitation is
2004 unlikely to bite. */
2005 if (strcmp (name, ".reloc") == 0)
2006 hdr->sh_type = SHT_PROGBITS;
2007
2008 return true;
2009 }
2010
2011 /* Return the relocation value for @tpoff relocation
2012 if STT_TLS virtual address is ADDRESS. */
2013
2014 static bfd_vma
2015 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2016 {
2017 struct elf_link_hash_table *htab = elf_hash_table (info);
2018 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2019 bfd_vma static_tls_size;
2020
2021 /* If tls_sec is NULL, we should have signalled an error already. */
2022 if (htab->tls_sec == NULL)
2023 return 0;
2024
2025 /* Consider special static TLS alignment requirements. */
2026 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2027 return static_tls_size + htab->tls_sec->vma - address;
2028 }
2029
2030 /* Relocate an i386 ELF section. */
2031
2032 static int
2033 elf_i386_relocate_section (bfd *output_bfd,
2034 struct bfd_link_info *info,
2035 bfd *input_bfd,
2036 asection *input_section,
2037 bfd_byte *contents,
2038 Elf_Internal_Rela *relocs,
2039 Elf_Internal_Sym *local_syms,
2040 asection **local_sections)
2041 {
2042 struct elf_x86_link_hash_table *htab;
2043 Elf_Internal_Shdr *symtab_hdr;
2044 struct elf_link_hash_entry **sym_hashes;
2045 bfd_vma *local_got_offsets;
2046 bfd_vma *local_tlsdesc_gotents;
2047 Elf_Internal_Rela *rel;
2048 Elf_Internal_Rela *wrel;
2049 Elf_Internal_Rela *relend;
2050 bool is_vxworks_tls;
2051 unsigned expected_tls_le;
2052 unsigned plt_entry_size;
2053
2054 /* Skip if check_relocs or scan_relocs failed. */
2055 if (input_section->check_relocs_failed)
2056 return false;
2057
2058 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2059 if (htab == NULL)
2060 return false;
2061
2062 if (!is_x86_elf (input_bfd, htab))
2063 {
2064 bfd_set_error (bfd_error_wrong_format);
2065 return false;
2066 }
2067
2068 symtab_hdr = &elf_symtab_hdr (input_bfd);
2069 sym_hashes = elf_sym_hashes (input_bfd);
2070 local_got_offsets = elf_local_got_offsets (input_bfd);
2071 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2072 /* We have to handle relocations in vxworks .tls_vars sections
2073 specially, because the dynamic loader is 'weird'. */
2074 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2075 && bfd_link_pic (info)
2076 && !strcmp (input_section->output_section->name,
2077 ".tls_vars"));
2078
2079 _bfd_x86_elf_set_tls_module_base (info);
2080
2081 plt_entry_size = htab->plt.plt_entry_size;
2082
2083 rel = wrel = relocs;
2084 relend = relocs + input_section->reloc_count;
2085 for (; rel < relend; wrel++, rel++)
2086 {
2087 unsigned int r_type, r_type_tls;
2088 reloc_howto_type *howto;
2089 unsigned long r_symndx;
2090 struct elf_link_hash_entry *h;
2091 struct elf_x86_link_hash_entry *eh;
2092 Elf_Internal_Sym *sym;
2093 asection *sec;
2094 bfd_vma off, offplt, plt_offset;
2095 bfd_vma relocation;
2096 bool unresolved_reloc;
2097 bfd_reloc_status_type r;
2098 unsigned int indx;
2099 int tls_type;
2100 bfd_vma st_size;
2101 asection *resolved_plt;
2102 bool resolved_to_zero;
2103 bool relative_reloc;
2104
2105 r_type = ELF32_R_TYPE (rel->r_info);
2106 if (r_type == R_386_GNU_VTINHERIT
2107 || r_type == R_386_GNU_VTENTRY)
2108 {
2109 if (wrel != rel)
2110 *wrel = *rel;
2111 continue;
2112 }
2113
2114 howto = elf_i386_rtype_to_howto (r_type);
2115 if (howto == NULL)
2116 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2117
2118 r_symndx = ELF32_R_SYM (rel->r_info);
2119 h = NULL;
2120 sym = NULL;
2121 sec = NULL;
2122 unresolved_reloc = false;
2123 if (r_symndx < symtab_hdr->sh_info)
2124 {
2125 sym = local_syms + r_symndx;
2126 sec = local_sections[r_symndx];
2127 relocation = (sec->output_section->vma
2128 + sec->output_offset
2129 + sym->st_value);
2130 st_size = sym->st_size;
2131
2132 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2133 && ((sec->flags & SEC_MERGE) != 0
2134 || (bfd_link_relocatable (info)
2135 && sec->output_offset != 0)))
2136 {
2137 bfd_vma addend;
2138 bfd_byte *where = contents + rel->r_offset;
2139
2140 switch (bfd_get_reloc_size (howto))
2141 {
2142 case 1:
2143 addend = bfd_get_8 (input_bfd, where);
2144 if (howto->pc_relative)
2145 {
2146 addend = (addend ^ 0x80) - 0x80;
2147 addend += 1;
2148 }
2149 break;
2150 case 2:
2151 addend = bfd_get_16 (input_bfd, where);
2152 if (howto->pc_relative)
2153 {
2154 addend = (addend ^ 0x8000) - 0x8000;
2155 addend += 2;
2156 }
2157 break;
2158 case 4:
2159 addend = bfd_get_32 (input_bfd, where);
2160 if (howto->pc_relative)
2161 {
2162 addend = (addend ^ 0x80000000) - 0x80000000;
2163 addend += 4;
2164 }
2165 break;
2166 default:
2167 abort ();
2168 }
2169
2170 if (bfd_link_relocatable (info))
2171 addend += sec->output_offset;
2172 else
2173 {
2174 asection *msec = sec;
2175 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2176 addend);
2177 addend -= relocation;
2178 addend += msec->output_section->vma + msec->output_offset;
2179 }
2180
2181 switch (bfd_get_reloc_size (howto))
2182 {
2183 case 1:
2184 /* FIXME: overflow checks. */
2185 if (howto->pc_relative)
2186 addend -= 1;
2187 bfd_put_8 (input_bfd, addend, where);
2188 break;
2189 case 2:
2190 if (howto->pc_relative)
2191 addend -= 2;
2192 bfd_put_16 (input_bfd, addend, where);
2193 break;
2194 case 4:
2195 if (howto->pc_relative)
2196 addend -= 4;
2197 bfd_put_32 (input_bfd, addend, where);
2198 break;
2199 }
2200 }
2201 else if (!bfd_link_relocatable (info)
2202 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2203 {
2204 /* Relocate against local STT_GNU_IFUNC symbol. */
2205 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2206 false);
2207 if (h == NULL)
2208 abort ();
2209
2210 /* Set STT_GNU_IFUNC symbol value. */
2211 h->root.u.def.value = sym->st_value;
2212 h->root.u.def.section = sec;
2213 }
2214 }
2215 else
2216 {
2217 bool warned ATTRIBUTE_UNUSED;
2218 bool ignored ATTRIBUTE_UNUSED;
2219
2220 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2221 r_symndx, symtab_hdr, sym_hashes,
2222 h, sec, relocation,
2223 unresolved_reloc, warned, ignored);
2224 st_size = h->size;
2225 }
2226
2227 if (sec != NULL && discarded_section (sec))
2228 {
2229 _bfd_clear_contents (howto, input_bfd, input_section,
2230 contents, rel->r_offset);
2231 wrel->r_offset = rel->r_offset;
2232 wrel->r_info = 0;
2233 wrel->r_addend = 0;
2234
2235 /* For ld -r, remove relocations in debug sections against
2236 sections defined in discarded sections. Not done for
2237 eh_frame editing code expects to be present. */
2238 if (bfd_link_relocatable (info)
2239 && (input_section->flags & SEC_DEBUGGING))
2240 wrel--;
2241
2242 continue;
2243 }
2244
2245 if (bfd_link_relocatable (info))
2246 {
2247 if (wrel != rel)
2248 *wrel = *rel;
2249 continue;
2250 }
2251
2252 eh = (struct elf_x86_link_hash_entry *) h;
2253
2254 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2255 it here if it is defined in a non-shared object. */
2256 if (h != NULL
2257 && h->type == STT_GNU_IFUNC
2258 && h->def_regular)
2259 {
2260 asection *gotplt, *base_got;
2261 bfd_vma plt_index;
2262 const char *name;
2263
2264 if ((input_section->flags & SEC_ALLOC) == 0)
2265 {
2266 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2267 STT_GNU_IFUNC symbol as STT_FUNC. */
2268 if (elf_section_type (input_section) == SHT_NOTE)
2269 goto skip_ifunc;
2270 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2271 sections because such sections are not SEC_ALLOC and
2272 thus ld.so will not process them. */
2273 if ((input_section->flags & SEC_DEBUGGING) != 0)
2274 continue;
2275 abort ();
2276 }
2277
2278 /* STT_GNU_IFUNC symbol must go through PLT. */
2279 if (htab->elf.splt != NULL)
2280 {
2281 if (htab->plt_second != NULL)
2282 {
2283 resolved_plt = htab->plt_second;
2284 plt_offset = eh->plt_second.offset;
2285 }
2286 else
2287 {
2288 resolved_plt = htab->elf.splt;
2289 plt_offset = h->plt.offset;
2290 }
2291 gotplt = htab->elf.sgotplt;
2292 }
2293 else
2294 {
2295 resolved_plt = htab->elf.iplt;
2296 plt_offset = h->plt.offset;
2297 gotplt = htab->elf.igotplt;
2298 }
2299
2300 switch (r_type)
2301 {
2302 default:
2303 break;
2304
2305 case R_386_GOT32:
2306 case R_386_GOT32X:
2307 base_got = htab->elf.sgot;
2308 off = h->got.offset;
2309
2310 if (base_got == NULL)
2311 abort ();
2312
2313 if (off == (bfd_vma) -1)
2314 {
2315 /* We can't use h->got.offset here to save state, or
2316 even just remember the offset, as finish_dynamic_symbol
2317 would use that as offset into .got. */
2318
2319 if (h->plt.offset == (bfd_vma) -1)
2320 abort ();
2321
2322 if (htab->elf.splt != NULL)
2323 {
2324 plt_index = (h->plt.offset / plt_entry_size
2325 - htab->plt.has_plt0);
2326 off = (plt_index + 3) * 4;
2327 base_got = htab->elf.sgotplt;
2328 }
2329 else
2330 {
2331 plt_index = h->plt.offset / plt_entry_size;
2332 off = plt_index * 4;
2333 base_got = htab->elf.igotplt;
2334 }
2335
2336 if (h->dynindx == -1
2337 || h->forced_local
2338 || info->symbolic)
2339 {
2340 /* This references the local defitionion. We must
2341 initialize this entry in the global offset table.
2342 Since the offset must always be a multiple of 4,
2343 we use the least significant bit to record
2344 whether we have initialized it already.
2345
2346 When doing a dynamic link, we create a .rela.got
2347 relocation entry to initialize the value. This
2348 is done in the finish_dynamic_symbol routine. */
2349 if ((off & 1) != 0)
2350 off &= ~1;
2351 else
2352 {
2353 bfd_put_32 (output_bfd, relocation,
2354 base_got->contents + off);
2355 h->got.offset |= 1;
2356 }
2357 }
2358
2359 relocation = off;
2360 }
2361 else
2362 relocation = (base_got->output_section->vma
2363 + base_got->output_offset + off
2364 - gotplt->output_section->vma
2365 - gotplt->output_offset);
2366
2367 if (rel->r_offset > 1
2368 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2369 && *(contents + rel->r_offset - 2) != 0x8d)
2370 {
2371 if (bfd_link_pic (info))
2372 goto disallow_got32;
2373
2374 /* Add the GOT base if there is no base register. */
2375 relocation += (gotplt->output_section->vma
2376 + gotplt->output_offset);
2377 }
2378 else if (htab->elf.splt == NULL)
2379 {
2380 /* Adjust for static executables. */
2381 relocation += gotplt->output_offset;
2382 }
2383
2384 goto do_relocation;
2385 }
2386
2387 if (h->plt.offset == (bfd_vma) -1)
2388 {
2389 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2390 if (r_type == R_386_32
2391 && (input_section->flags & SEC_CODE) == 0)
2392 goto do_ifunc_pointer;
2393 goto bad_ifunc_reloc;
2394 }
2395
2396 relocation = (resolved_plt->output_section->vma
2397 + resolved_plt->output_offset + plt_offset);
2398
2399 switch (r_type)
2400 {
2401 default:
2402 bad_ifunc_reloc:
2403 if (h->root.root.string)
2404 name = h->root.root.string;
2405 else
2406 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2407 NULL);
2408 _bfd_error_handler
2409 /* xgettext:c-format */
2410 (_("%pB: relocation %s against STT_GNU_IFUNC "
2411 "symbol `%s' isn't supported"), input_bfd,
2412 howto->name, name);
2413 bfd_set_error (bfd_error_bad_value);
2414 return false;
2415
2416 case R_386_32:
2417 /* Generate dynamic relcoation only when there is a
2418 non-GOT reference in a shared object. */
2419 if ((bfd_link_pic (info) && h->non_got_ref)
2420 || h->plt.offset == (bfd_vma) -1)
2421 {
2422 Elf_Internal_Rela outrel;
2423 asection *sreloc;
2424 bfd_vma offset;
2425
2426 do_ifunc_pointer:
2427 /* Need a dynamic relocation to get the real function
2428 adddress. */
2429 offset = _bfd_elf_section_offset (output_bfd,
2430 info,
2431 input_section,
2432 rel->r_offset);
2433 if (offset == (bfd_vma) -1
2434 || offset == (bfd_vma) -2)
2435 abort ();
2436
2437 outrel.r_offset = (input_section->output_section->vma
2438 + input_section->output_offset
2439 + offset);
2440
2441 if (POINTER_LOCAL_IFUNC_P (info, h))
2442 {
2443 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2444 h->root.root.string,
2445 h->root.u.def.section->owner);
2446
2447 /* This symbol is resolved locally. */
2448 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2449
2450 if (htab->params->report_relative_reloc)
2451 _bfd_x86_elf_link_report_relative_reloc
2452 (info, input_section, h, sym,
2453 "R_386_IRELATIVE", &outrel);
2454
2455 bfd_put_32 (output_bfd,
2456 (h->root.u.def.value
2457 + h->root.u.def.section->output_section->vma
2458 + h->root.u.def.section->output_offset),
2459 contents + offset);
2460 }
2461 else
2462 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2463
2464 /* Dynamic relocations are stored in
2465 1. .rel.ifunc section in PIC object.
2466 2. .rel.got section in dynamic executable.
2467 3. .rel.iplt section in static executable. */
2468 if (bfd_link_pic (info))
2469 sreloc = htab->elf.irelifunc;
2470 else if (htab->elf.splt != NULL)
2471 sreloc = htab->elf.srelgot;
2472 else
2473 sreloc = htab->elf.irelplt;
2474 elf_append_rel (output_bfd, sreloc, &outrel);
2475
2476 /* If this reloc is against an external symbol, we
2477 do not want to fiddle with the addend. Otherwise,
2478 we need to include the symbol value so that it
2479 becomes an addend for the dynamic reloc. For an
2480 internal symbol, we have updated addend. */
2481 continue;
2482 }
2483 /* FALLTHROUGH */
2484 case R_386_PC32:
2485 case R_386_PLT32:
2486 goto do_relocation;
2487
2488 case R_386_GOTOFF:
2489 /* NB: We can't use the PLT entry as the function address
2490 for PIC since the PIC register may not be set up
2491 properly for indirect call. */
2492 if (bfd_link_pic (info))
2493 goto bad_ifunc_reloc;
2494 relocation -= (gotplt->output_section->vma
2495 + gotplt->output_offset);
2496 goto do_relocation;
2497 }
2498 }
2499
2500 skip_ifunc:
2501 resolved_to_zero = (eh != NULL
2502 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2503
2504 switch (r_type)
2505 {
2506 case R_386_GOT32X:
2507 case R_386_GOT32:
2508 /* Relocation is to the entry for this symbol in the global
2509 offset table. */
2510 if (htab->elf.sgot == NULL)
2511 abort ();
2512
2513 relative_reloc = false;
2514 if (h != NULL)
2515 {
2516 off = h->got.offset;
2517 if (RESOLVED_LOCALLY_P (info, h, htab))
2518 {
2519 /* We must initialize this entry in the global offset
2520 table. Since the offset must always be a multiple
2521 of 4, we use the least significant bit to record
2522 whether we have initialized it already.
2523
2524 When doing a dynamic link, we create a .rel.got
2525 relocation entry to initialize the value. This
2526 is done in the finish_dynamic_symbol routine. */
2527 if ((off & 1) != 0)
2528 off &= ~1;
2529 else
2530 {
2531 bfd_put_32 (output_bfd, relocation,
2532 htab->elf.sgot->contents + off);
2533 h->got.offset |= 1;
2534 /* NB: Don't generate relative relocation here if
2535 it has been generated by DT_RELR. */
2536 if (!info->enable_dt_relr
2537 && GENERATE_RELATIVE_RELOC_P (info, h))
2538 {
2539 /* PR ld/21402: If this symbol isn't dynamic
2540 in PIC, generate R_386_RELATIVE here. */
2541 eh->no_finish_dynamic_symbol = 1;
2542 relative_reloc = true;
2543 }
2544 }
2545 }
2546 else
2547 unresolved_reloc = false;
2548 }
2549 else
2550 {
2551 if (local_got_offsets == NULL)
2552 abort ();
2553
2554 off = local_got_offsets[r_symndx];
2555
2556 /* The offset must always be a multiple of 4. We use
2557 the least significant bit to record whether we have
2558 already generated the necessary reloc. */
2559 if ((off & 1) != 0)
2560 off &= ~1;
2561 else
2562 {
2563 bfd_put_32 (output_bfd, relocation,
2564 htab->elf.sgot->contents + off);
2565 local_got_offsets[r_symndx] |= 1;
2566
2567 /* NB: Don't generate relative relocation here if it
2568 has been generated by DT_RELR. */
2569 if (!info->enable_dt_relr && bfd_link_pic (info))
2570 relative_reloc = true;
2571 }
2572 }
2573
2574 if (relative_reloc)
2575 {
2576 asection *s;
2577 Elf_Internal_Rela outrel;
2578
2579 s = htab->elf.srelgot;
2580 if (s == NULL)
2581 abort ();
2582
2583 outrel.r_offset = (htab->elf.sgot->output_section->vma
2584 + htab->elf.sgot->output_offset
2585 + off);
2586 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2587
2588 if (htab->params->report_relative_reloc)
2589 _bfd_x86_elf_link_report_relative_reloc
2590 (info, input_section, h, sym, "R_386_RELATIVE",
2591 &outrel);
2592
2593 elf_append_rel (output_bfd, s, &outrel);
2594 }
2595
2596 if (off >= (bfd_vma) -2)
2597 abort ();
2598
2599 relocation = (htab->elf.sgot->output_section->vma
2600 + htab->elf.sgot->output_offset + off);
2601 if (rel->r_offset > 1
2602 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2603 && *(contents + rel->r_offset - 2) != 0x8d)
2604 {
2605 if (bfd_link_pic (info))
2606 {
2607 /* For PIC, disallow R_386_GOT32 without a base
2608 register, except for "lea foo@GOT, %reg", since
2609 we don't know what the GOT base is. */
2610 const char *name;
2611
2612 disallow_got32:
2613 if (h == NULL || h->root.root.string == NULL)
2614 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2615 NULL);
2616 else
2617 name = h->root.root.string;
2618
2619 _bfd_error_handler
2620 /* xgettext:c-format */
2621 (_("%pB: direct GOT relocation %s against `%s'"
2622 " without base register can not be used"
2623 " when making a shared object"),
2624 input_bfd, howto->name, name);
2625 bfd_set_error (bfd_error_bad_value);
2626 return false;
2627 }
2628 }
2629 else
2630 {
2631 /* Subtract the .got.plt section address only with a base
2632 register. */
2633 relocation -= (htab->elf.sgotplt->output_section->vma
2634 + htab->elf.sgotplt->output_offset);
2635 }
2636
2637 break;
2638
2639 case R_386_GOTOFF:
2640 /* Relocation is relative to the start of the global offset
2641 table. */
2642
2643 /* Check to make sure it isn't a protected function or data
2644 symbol for shared library since it may not be local when
2645 used as function address or with copy relocation. We also
2646 need to make sure that a symbol is referenced locally. */
2647 if (!bfd_link_executable (info) && h)
2648 {
2649 if (!h->def_regular)
2650 {
2651 const char *v;
2652
2653 switch (ELF_ST_VISIBILITY (h->other))
2654 {
2655 case STV_HIDDEN:
2656 v = _("hidden symbol");
2657 break;
2658 case STV_INTERNAL:
2659 v = _("internal symbol");
2660 break;
2661 case STV_PROTECTED:
2662 v = _("protected symbol");
2663 break;
2664 default:
2665 v = _("symbol");
2666 break;
2667 }
2668
2669 _bfd_error_handler
2670 /* xgettext:c-format */
2671 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2672 " `%s' can not be used when making a shared object"),
2673 input_bfd, v, h->root.root.string);
2674 bfd_set_error (bfd_error_bad_value);
2675 return false;
2676 }
2677 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2678 && (h->type == STT_FUNC
2679 || h->type == STT_OBJECT)
2680 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2681 {
2682 _bfd_error_handler
2683 /* xgettext:c-format */
2684 (_("%pB: relocation R_386_GOTOFF against protected %s"
2685 " `%s' can not be used when making a shared object"),
2686 input_bfd,
2687 h->type == STT_FUNC ? "function" : "data",
2688 h->root.root.string);
2689 bfd_set_error (bfd_error_bad_value);
2690 return false;
2691 }
2692 }
2693
2694 /* Note that sgot is not involved in this
2695 calculation. We always want the start of .got.plt. If we
2696 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2697 permitted by the ABI, we might have to change this
2698 calculation. */
2699 relocation -= htab->elf.sgotplt->output_section->vma
2700 + htab->elf.sgotplt->output_offset;
2701 break;
2702
2703 case R_386_GOTPC:
2704 /* Use global offset table as symbol value. */
2705 relocation = htab->elf.sgotplt->output_section->vma
2706 + htab->elf.sgotplt->output_offset;
2707 unresolved_reloc = false;
2708 break;
2709
2710 case R_386_PLT32:
2711 /* Relocation is to the entry for this symbol in the
2712 procedure linkage table. */
2713
2714 /* Resolve a PLT32 reloc against a local symbol directly,
2715 without using the procedure linkage table. */
2716 if (h == NULL)
2717 break;
2718
2719 if ((h->plt.offset == (bfd_vma) -1
2720 && eh->plt_got.offset == (bfd_vma) -1)
2721 || htab->elf.splt == NULL)
2722 {
2723 /* We didn't make a PLT entry for this symbol. This
2724 happens when statically linking PIC code, or when
2725 using -Bsymbolic. */
2726 break;
2727 }
2728
2729 if (h->plt.offset != (bfd_vma) -1)
2730 {
2731 if (htab->plt_second != NULL)
2732 {
2733 resolved_plt = htab->plt_second;
2734 plt_offset = eh->plt_second.offset;
2735 }
2736 else
2737 {
2738 resolved_plt = htab->elf.splt;
2739 plt_offset = h->plt.offset;
2740 }
2741 }
2742 else
2743 {
2744 resolved_plt = htab->plt_got;
2745 plt_offset = eh->plt_got.offset;
2746 }
2747
2748 relocation = (resolved_plt->output_section->vma
2749 + resolved_plt->output_offset
2750 + plt_offset);
2751 unresolved_reloc = false;
2752 break;
2753
2754 case R_386_SIZE32:
2755 /* Set to symbol size. */
2756 relocation = st_size;
2757 /* Fall through. */
2758
2759 case R_386_32:
2760 case R_386_PC32:
2761 if ((input_section->flags & SEC_ALLOC) == 0
2762 || is_vxworks_tls)
2763 break;
2764
2765 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2766 sec, false,
2767 resolved_to_zero,
2768 (r_type == R_386_PC32)))
2769 {
2770 Elf_Internal_Rela outrel;
2771 bool skip, relocate;
2772 bool generate_dynamic_reloc = true;
2773 asection *sreloc;
2774
2775 /* When generating a shared object, these relocations
2776 are copied into the output file to be resolved at run
2777 time. */
2778
2779 skip = false;
2780 relocate = false;
2781
2782 outrel.r_offset =
2783 _bfd_elf_section_offset (output_bfd, info, input_section,
2784 rel->r_offset);
2785 if (outrel.r_offset == (bfd_vma) -1)
2786 skip = true;
2787 else if (outrel.r_offset == (bfd_vma) -2)
2788 skip = true, relocate = true;
2789 outrel.r_offset += (input_section->output_section->vma
2790 + input_section->output_offset);
2791
2792 if (skip)
2793 memset (&outrel, 0, sizeof outrel);
2794 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2795 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2796 else
2797 {
2798 /* This symbol is local, or marked to become local. */
2799 relocate = true;
2800 /* NB: Don't generate relative relocation here if it
2801 has been generated by DT_RELR. */
2802 if (info->enable_dt_relr)
2803 generate_dynamic_reloc = false;
2804 else
2805 {
2806 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2807
2808 if (htab->params->report_relative_reloc)
2809 _bfd_x86_elf_link_report_relative_reloc
2810 (info, input_section, h, sym, "R_386_RELATIVE",
2811 &outrel);
2812 }
2813 }
2814
2815 if (generate_dynamic_reloc)
2816 {
2817 sreloc = elf_section_data (input_section)->sreloc;
2818
2819 if (sreloc == NULL || sreloc->contents == NULL)
2820 {
2821 r = bfd_reloc_notsupported;
2822 goto check_relocation_error;
2823 }
2824
2825 elf_append_rel (output_bfd, sreloc, &outrel);
2826 }
2827
2828 /* If this reloc is against an external symbol, we do
2829 not want to fiddle with the addend. Otherwise, we
2830 need to include the symbol value so that it becomes
2831 an addend for the dynamic reloc. */
2832 if (! relocate)
2833 continue;
2834 }
2835 break;
2836
2837 case R_386_TLS_IE:
2838 if (!bfd_link_executable (info))
2839 {
2840 Elf_Internal_Rela outrel;
2841 asection *sreloc;
2842
2843 outrel.r_offset = rel->r_offset
2844 + input_section->output_section->vma
2845 + input_section->output_offset;
2846 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2847
2848 if (htab->params->report_relative_reloc)
2849 _bfd_x86_elf_link_report_relative_reloc
2850 (info, input_section, h, sym, "R_386_RELATIVE",
2851 &outrel);
2852
2853 sreloc = elf_section_data (input_section)->sreloc;
2854 if (sreloc == NULL)
2855 abort ();
2856 elf_append_rel (output_bfd, sreloc, &outrel);
2857 }
2858 /* Fall through */
2859
2860 case R_386_TLS_GD:
2861 case R_386_TLS_GOTDESC:
2862 case R_386_TLS_DESC_CALL:
2863 case R_386_TLS_IE_32:
2864 case R_386_TLS_GOTIE:
2865 tls_type = GOT_UNKNOWN;
2866 if (h == NULL && local_got_offsets)
2867 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2868 else if (h != NULL)
2869 tls_type = elf_x86_hash_entry(h)->tls_type;
2870 if (tls_type == GOT_TLS_IE)
2871 tls_type = GOT_TLS_IE_NEG;
2872
2873 r_type_tls = r_type;
2874 if (! elf_i386_tls_transition (info, input_bfd,
2875 input_section, contents,
2876 symtab_hdr, sym_hashes,
2877 &r_type_tls, tls_type, rel,
2878 relend, h, r_symndx, true))
2879 return false;
2880
2881 expected_tls_le = htab->elf.target_os == is_solaris
2882 ? R_386_TLS_LE : R_386_TLS_LE_32;
2883 if (r_type_tls == expected_tls_le)
2884 {
2885 /* NB: Solaris only supports R_386_TLS_GD->R_386_TLS_LE. */
2886 BFD_ASSERT (! unresolved_reloc
2887 && (htab->elf.target_os != is_solaris
2888 || (htab->elf.target_os == is_solaris
2889 && (r_type == R_386_TLS_GD
2890 || r_type == R_386_TLS_IE
2891 || r_type == R_386_TLS_GOTIE))));
2892 if (r_type == R_386_TLS_GD)
2893 {
2894 unsigned int type;
2895 bfd_vma roff;
2896
2897 /* GD->LE transition. */
2898 type = *(contents + rel->r_offset - 2);
2899 if (type == 0x04)
2900 {
2901 /* Change
2902 leal foo@tlsgd(,%ebx,1), %eax
2903 call ___tls_get_addr@PLT
2904 into:
2905 movl %gs:0, %eax
2906 subl $foo@tpoff, %eax
2907 (6 byte form of subl). */
2908 roff = rel->r_offset + 5;
2909 }
2910 else
2911 {
2912 /* Change
2913 leal foo@tlsgd(%ebx), %eax
2914 call ___tls_get_addr@PLT
2915 nop
2916 or
2917 leal foo@tlsgd(%reg), %eax
2918 call *___tls_get_addr@GOT(%reg)
2919 which may be converted to
2920 addr32 call ___tls_get_addr
2921 into:
2922 movl %gs:0, %eax; subl $foo@tpoff, %eax
2923 (6 byte form of subl). */
2924 roff = rel->r_offset + 6;
2925 }
2926 memcpy (contents + roff - 8,
2927 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2928 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2929 contents + roff);
2930 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2931 rel++;
2932 wrel++;
2933 continue;
2934 }
2935 else if (r_type == R_386_TLS_GOTDESC)
2936 {
2937 /* GDesc -> LE transition.
2938 It's originally something like:
2939 leal x@tlsdesc(%ebx), %eax
2940
2941 leal x@ntpoff, %eax
2942
2943 Registers other than %eax may be set up here. */
2944
2945 unsigned int val;
2946 bfd_vma roff;
2947
2948 roff = rel->r_offset;
2949 val = bfd_get_8 (input_bfd, contents + roff - 1);
2950
2951 /* Now modify the instruction as appropriate. */
2952 /* aoliva FIXME: remove the above and xor the byte
2953 below with 0x86. */
2954 bfd_put_8 (output_bfd, val ^ 0x86,
2955 contents + roff - 1);
2956 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2957 contents + roff);
2958 continue;
2959 }
2960 else if (r_type == R_386_TLS_DESC_CALL)
2961 {
2962 /* GDesc -> LE transition.
2963 It's originally:
2964 call *(%eax)
2965 Turn it into:
2966 xchg %ax,%ax */
2967
2968 bfd_vma roff;
2969
2970 roff = rel->r_offset;
2971 bfd_put_8 (output_bfd, 0x66, contents + roff);
2972 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2973 continue;
2974 }
2975 else if (r_type == R_386_TLS_IE)
2976 {
2977 unsigned int val;
2978
2979 /* IE->LE transition:
2980 Originally it can be one of:
2981 movl foo, %eax
2982 movl foo, %reg
2983 addl foo, %reg
2984 We change it into:
2985 movl $foo, %eax
2986 movl $foo, %reg
2987 addl $foo, %reg. */
2988 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2989 if (val == 0xa1)
2990 {
2991 /* movl foo, %eax. */
2992 bfd_put_8 (output_bfd, 0xb8,
2993 contents + rel->r_offset - 1);
2994 }
2995 else
2996 {
2997 unsigned int type;
2998
2999 type = bfd_get_8 (input_bfd,
3000 contents + rel->r_offset - 2);
3001 switch (type)
3002 {
3003 case 0x8b:
3004 /* movl */
3005 bfd_put_8 (output_bfd, 0xc7,
3006 contents + rel->r_offset - 2);
3007 bfd_put_8 (output_bfd,
3008 0xc0 | ((val >> 3) & 7),
3009 contents + rel->r_offset - 1);
3010 break;
3011 case 0x03:
3012 /* addl */
3013 bfd_put_8 (output_bfd, 0x81,
3014 contents + rel->r_offset - 2);
3015 bfd_put_8 (output_bfd,
3016 0xc0 | ((val >> 3) & 7),
3017 contents + rel->r_offset - 1);
3018 break;
3019 default:
3020 BFD_FAIL ();
3021 break;
3022 }
3023 }
3024 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3025 contents + rel->r_offset);
3026 continue;
3027 }
3028 else
3029 {
3030 unsigned int val, type;
3031
3032 /* {IE_32,GOTIE}->LE transition:
3033 Originally it can be one of:
3034 subl foo(%reg1), %reg2
3035 movl foo(%reg1), %reg2
3036 addl foo(%reg1), %reg2
3037 We change it into:
3038 subl $foo, %reg2
3039 movl $foo, %reg2 (6 byte form)
3040 addl $foo, %reg2. */
3041 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3042 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3043 if (type == 0x8b)
3044 {
3045 /* movl */
3046 bfd_put_8 (output_bfd, 0xc7,
3047 contents + rel->r_offset - 2);
3048 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3049 contents + rel->r_offset - 1);
3050 }
3051 else if (type == 0x2b)
3052 {
3053 /* subl */
3054 bfd_put_8 (output_bfd, 0x81,
3055 contents + rel->r_offset - 2);
3056 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3057 contents + rel->r_offset - 1);
3058 }
3059 else if (type == 0x03)
3060 {
3061 /* addl */
3062 bfd_put_8 (output_bfd, 0x81,
3063 contents + rel->r_offset - 2);
3064 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3065 contents + rel->r_offset - 1);
3066 }
3067 else
3068 BFD_FAIL ();
3069 if (r_type == R_386_TLS_GOTIE)
3070 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3071 contents + rel->r_offset);
3072 else
3073 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3074 contents + rel->r_offset);
3075 continue;
3076 }
3077 }
3078
3079 if (htab->elf.sgot == NULL)
3080 abort ();
3081
3082 if (h != NULL)
3083 {
3084 off = h->got.offset;
3085 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3086 }
3087 else
3088 {
3089 if (local_got_offsets == NULL)
3090 abort ();
3091
3092 off = local_got_offsets[r_symndx];
3093 offplt = local_tlsdesc_gotents[r_symndx];
3094 }
3095
3096 if ((off & 1) != 0)
3097 off &= ~1;
3098 else
3099 {
3100 Elf_Internal_Rela outrel;
3101 int dr_type;
3102 asection *sreloc;
3103
3104 if (htab->elf.srelgot == NULL)
3105 abort ();
3106
3107 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3108
3109 if (GOT_TLS_GDESC_P (tls_type))
3110 {
3111 bfd_byte *loc;
3112 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3113 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3114 <= htab->elf.sgotplt->size);
3115 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3116 + htab->elf.sgotplt->output_offset
3117 + offplt
3118 + htab->sgotplt_jump_table_size);
3119 sreloc = htab->elf.srelplt;
3120 loc = sreloc->contents;
3121 loc += (htab->next_tls_desc_index++
3122 * sizeof (Elf32_External_Rel));
3123 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3124 <= sreloc->contents + sreloc->size);
3125 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3126 if (indx == 0)
3127 {
3128 BFD_ASSERT (! unresolved_reloc);
3129 bfd_put_32 (output_bfd,
3130 relocation - _bfd_x86_elf_dtpoff_base (info),
3131 htab->elf.sgotplt->contents + offplt
3132 + htab->sgotplt_jump_table_size + 4);
3133 }
3134 else
3135 {
3136 bfd_put_32 (output_bfd, 0,
3137 htab->elf.sgotplt->contents + offplt
3138 + htab->sgotplt_jump_table_size + 4);
3139 }
3140 }
3141
3142 sreloc = htab->elf.srelgot;
3143
3144 outrel.r_offset = (htab->elf.sgot->output_section->vma
3145 + htab->elf.sgot->output_offset + off);
3146
3147 if (GOT_TLS_GD_P (tls_type))
3148 dr_type = R_386_TLS_DTPMOD32;
3149 else if (GOT_TLS_GDESC_P (tls_type))
3150 goto dr_done;
3151 else if (tls_type == GOT_TLS_IE_POS)
3152 dr_type = R_386_TLS_TPOFF;
3153 else
3154 dr_type = R_386_TLS_TPOFF32;
3155
3156 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3157 bfd_put_32 (output_bfd,
3158 relocation - _bfd_x86_elf_dtpoff_base (info),
3159 htab->elf.sgot->contents + off);
3160 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3161 bfd_put_32 (output_bfd,
3162 _bfd_x86_elf_dtpoff_base (info) - relocation,
3163 htab->elf.sgot->contents + off);
3164 else if (dr_type != R_386_TLS_DESC)
3165 bfd_put_32 (output_bfd, 0,
3166 htab->elf.sgot->contents + off);
3167 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3168
3169 elf_append_rel (output_bfd, sreloc, &outrel);
3170
3171 if (GOT_TLS_GD_P (tls_type))
3172 {
3173 if (indx == 0)
3174 {
3175 BFD_ASSERT (! unresolved_reloc);
3176 bfd_put_32 (output_bfd,
3177 relocation - _bfd_x86_elf_dtpoff_base (info),
3178 htab->elf.sgot->contents + off + 4);
3179 }
3180 else
3181 {
3182 bfd_put_32 (output_bfd, 0,
3183 htab->elf.sgot->contents + off + 4);
3184 outrel.r_info = ELF32_R_INFO (indx,
3185 R_386_TLS_DTPOFF32);
3186 outrel.r_offset += 4;
3187 elf_append_rel (output_bfd, sreloc, &outrel);
3188 }
3189 }
3190 else if (tls_type == GOT_TLS_IE_BOTH)
3191 {
3192 bfd_put_32 (output_bfd,
3193 (indx == 0
3194 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3195 : 0),
3196 htab->elf.sgot->contents + off + 4);
3197 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3198 outrel.r_offset += 4;
3199 elf_append_rel (output_bfd, sreloc, &outrel);
3200 }
3201
3202 dr_done:
3203 if (h != NULL)
3204 h->got.offset |= 1;
3205 else
3206 local_got_offsets[r_symndx] |= 1;
3207 }
3208
3209 if (off >= (bfd_vma) -2
3210 && ! GOT_TLS_GDESC_P (tls_type))
3211 abort ();
3212 if (r_type_tls == R_386_TLS_GOTDESC
3213 || r_type_tls == R_386_TLS_DESC_CALL)
3214 {
3215 relocation = htab->sgotplt_jump_table_size + offplt;
3216 unresolved_reloc = false;
3217 }
3218 else if (r_type_tls == r_type)
3219 {
3220 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3221 + htab->elf.sgotplt->output_offset;
3222 relocation = htab->elf.sgot->output_section->vma
3223 + htab->elf.sgot->output_offset + off - g_o_t;
3224 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3225 && tls_type == GOT_TLS_IE_BOTH)
3226 relocation += 4;
3227 if (r_type == R_386_TLS_IE)
3228 relocation += g_o_t;
3229 unresolved_reloc = false;
3230 }
3231 else if (r_type == R_386_TLS_GD)
3232 {
3233 unsigned int val, type;
3234 bfd_vma roff;
3235
3236 /* GD->IE transition. */
3237 type = *(contents + rel->r_offset - 2);
3238 val = *(contents + rel->r_offset - 1);
3239 if (type == 0x04)
3240 {
3241 /* Change
3242 leal foo@tlsgd(,%ebx,1), %eax
3243 call ___tls_get_addr@PLT
3244 into:
3245 movl %gs:0, %eax
3246 subl $foo@gottpoff(%ebx), %eax. */
3247 val >>= 3;
3248 roff = rel->r_offset - 3;
3249 }
3250 else
3251 {
3252 /* Change
3253 leal foo@tlsgd(%ebx), %eax
3254 call ___tls_get_addr@PLT
3255 nop
3256 or
3257 leal foo@tlsgd(%reg), %eax
3258 call *___tls_get_addr@GOT(%reg)
3259 which may be converted to
3260 addr32 call ___tls_get_addr
3261 into:
3262 movl %gs:0, %eax;
3263 subl $foo@gottpoff(%reg), %eax. */
3264 roff = rel->r_offset - 2;
3265 }
3266 memcpy (contents + roff,
3267 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3268 contents[roff + 7] = 0x80 | (val & 7);
3269 /* If foo is used only with foo@gotntpoff(%reg) and
3270 foo@indntpoff, but not with foo@gottpoff(%reg), change
3271 subl $foo@gottpoff(%reg), %eax
3272 into:
3273 addl $foo@gotntpoff(%reg), %eax. */
3274 if (tls_type == GOT_TLS_IE_POS)
3275 contents[roff + 6] = 0x03;
3276 bfd_put_32 (output_bfd,
3277 htab->elf.sgot->output_section->vma
3278 + htab->elf.sgot->output_offset + off
3279 - htab->elf.sgotplt->output_section->vma
3280 - htab->elf.sgotplt->output_offset,
3281 contents + roff + 8);
3282 /* Skip R_386_PLT32 and R_386_GOT32X. */
3283 rel++;
3284 wrel++;
3285 continue;
3286 }
3287 else if (r_type == R_386_TLS_GOTDESC)
3288 {
3289 /* GDesc -> IE transition.
3290 It's originally something like:
3291 leal x@tlsdesc(%ebx), %eax
3292
3293 Change it to:
3294 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3295 or:
3296 movl x@gottpoff(%ebx), %eax # before negl %eax
3297
3298 Registers other than %eax may be set up here. */
3299
3300 bfd_vma roff;
3301
3302 /* First, make sure it's a leal adding ebx to a 32-bit
3303 offset into any register, although it's probably
3304 almost always going to be eax. */
3305 roff = rel->r_offset;
3306
3307 /* Now modify the instruction as appropriate. */
3308 /* To turn a leal into a movl in the form we use it, it
3309 suffices to change the first byte from 0x8d to 0x8b.
3310 aoliva FIXME: should we decide to keep the leal, all
3311 we have to do is remove the statement below, and
3312 adjust the relaxation of R_386_TLS_DESC_CALL. */
3313 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3314
3315 if (tls_type == GOT_TLS_IE_BOTH)
3316 off += 4;
3317
3318 bfd_put_32 (output_bfd,
3319 htab->elf.sgot->output_section->vma
3320 + htab->elf.sgot->output_offset + off
3321 - htab->elf.sgotplt->output_section->vma
3322 - htab->elf.sgotplt->output_offset,
3323 contents + roff);
3324 continue;
3325 }
3326 else if (r_type == R_386_TLS_DESC_CALL)
3327 {
3328 /* GDesc -> IE transition.
3329 It's originally:
3330 call *(%eax)
3331
3332 Change it to:
3333 xchg %ax,%ax
3334 or
3335 negl %eax
3336 depending on how we transformed the TLS_GOTDESC above.
3337 */
3338
3339 bfd_vma roff;
3340
3341 roff = rel->r_offset;
3342
3343 /* Now modify the instruction as appropriate. */
3344 if (tls_type != GOT_TLS_IE_NEG)
3345 {
3346 /* xchg %ax,%ax */
3347 bfd_put_8 (output_bfd, 0x66, contents + roff);
3348 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3349 }
3350 else
3351 {
3352 /* negl %eax */
3353 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3354 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3355 }
3356
3357 continue;
3358 }
3359 else
3360 BFD_ASSERT (false);
3361 break;
3362
3363 case R_386_TLS_LDM:
3364 if (! elf_i386_tls_transition (info, input_bfd,
3365 input_section, contents,
3366 symtab_hdr, sym_hashes,
3367 &r_type, GOT_UNKNOWN, rel,
3368 relend, h, r_symndx, true))
3369 return false;
3370
3371 if (r_type != R_386_TLS_LDM)
3372 {
3373 /* LD->LE transition. Change
3374 leal foo@tlsldm(%ebx) %eax
3375 call ___tls_get_addr@PLT
3376 into:
3377 movl %gs:0, %eax
3378 nop
3379 leal 0(%esi,1), %esi
3380 or change
3381 leal foo@tlsldm(%reg) %eax
3382 call *___tls_get_addr@GOT(%reg)
3383 which may be converted to
3384 addr32 call ___tls_get_addr
3385 into:
3386 movl %gs:0, %eax
3387 leal 0(%esi), %esi */
3388 expected_tls_le = htab->elf.target_os == is_solaris
3389 ? R_386_TLS_LE : R_386_TLS_LE_32;
3390 BFD_ASSERT (r_type == expected_tls_le);
3391 if (*(contents + rel->r_offset + 4) == 0xff
3392 || *(contents + rel->r_offset + 4) == 0x67)
3393 memcpy (contents + rel->r_offset - 2,
3394 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3395 else
3396 memcpy (contents + rel->r_offset - 2,
3397 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3398 /* Skip R_386_PC32/R_386_PLT32. */
3399 rel++;
3400 wrel++;
3401 continue;
3402 }
3403
3404 if (htab->elf.sgot == NULL)
3405 abort ();
3406
3407 off = htab->tls_ld_or_ldm_got.offset;
3408 if (off & 1)
3409 off &= ~1;
3410 else
3411 {
3412 Elf_Internal_Rela outrel;
3413
3414 if (htab->elf.srelgot == NULL)
3415 abort ();
3416
3417 outrel.r_offset = (htab->elf.sgot->output_section->vma
3418 + htab->elf.sgot->output_offset + off);
3419
3420 bfd_put_32 (output_bfd, 0,
3421 htab->elf.sgot->contents + off);
3422 bfd_put_32 (output_bfd, 0,
3423 htab->elf.sgot->contents + off + 4);
3424 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3425 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3426 htab->tls_ld_or_ldm_got.offset |= 1;
3427 }
3428 relocation = htab->elf.sgot->output_section->vma
3429 + htab->elf.sgot->output_offset + off
3430 - htab->elf.sgotplt->output_section->vma
3431 - htab->elf.sgotplt->output_offset;
3432 unresolved_reloc = false;
3433 break;
3434
3435 case R_386_TLS_LDO_32:
3436 if (!bfd_link_executable (info)
3437 || (input_section->flags & SEC_CODE) == 0)
3438 relocation -= _bfd_x86_elf_dtpoff_base (info);
3439 else
3440 /* When converting LDO to LE, we must negate. */
3441 relocation = -elf_i386_tpoff (info, relocation);
3442 break;
3443
3444 case R_386_TLS_LE_32:
3445 case R_386_TLS_LE:
3446 if (!bfd_link_executable (info))
3447 {
3448 Elf_Internal_Rela outrel;
3449 asection *sreloc;
3450
3451 outrel.r_offset = rel->r_offset
3452 + input_section->output_section->vma
3453 + input_section->output_offset;
3454 if (h != NULL && h->dynindx != -1)
3455 indx = h->dynindx;
3456 else
3457 indx = 0;
3458 if (r_type == R_386_TLS_LE_32)
3459 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3460 else
3461 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3462 sreloc = elf_section_data (input_section)->sreloc;
3463 if (sreloc == NULL)
3464 abort ();
3465 elf_append_rel (output_bfd, sreloc, &outrel);
3466 if (indx)
3467 continue;
3468 else if (r_type == R_386_TLS_LE_32)
3469 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3470 else
3471 relocation -= _bfd_x86_elf_dtpoff_base (info);
3472 }
3473 else if (r_type == R_386_TLS_LE_32)
3474 relocation = elf_i386_tpoff (info, relocation);
3475 else
3476 relocation = -elf_i386_tpoff (info, relocation);
3477 break;
3478
3479 default:
3480 break;
3481 }
3482
3483 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3484 because such sections are not SEC_ALLOC and thus ld.so will
3485 not process them. */
3486 if (unresolved_reloc
3487 && !((input_section->flags & SEC_DEBUGGING) != 0
3488 && h->def_dynamic)
3489 && _bfd_elf_section_offset (output_bfd, info, input_section,
3490 rel->r_offset) != (bfd_vma) -1)
3491 {
3492 _bfd_error_handler
3493 /* xgettext:c-format */
3494 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3495 input_bfd,
3496 input_section,
3497 (uint64_t) rel->r_offset,
3498 howto->name,
3499 h->root.root.string);
3500 return false;
3501 }
3502
3503 do_relocation:
3504 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3505 contents, rel->r_offset,
3506 relocation, 0);
3507
3508 check_relocation_error:
3509 if (r != bfd_reloc_ok)
3510 {
3511 const char *name;
3512
3513 if (h != NULL)
3514 name = h->root.root.string;
3515 else
3516 {
3517 name = bfd_elf_string_from_elf_section (input_bfd,
3518 symtab_hdr->sh_link,
3519 sym->st_name);
3520 if (name == NULL)
3521 return false;
3522 if (*name == '\0')
3523 name = bfd_section_name (sec);
3524 }
3525
3526 if (r == bfd_reloc_overflow)
3527 (*info->callbacks->reloc_overflow)
3528 (info, (h ? &h->root : NULL), name, howto->name,
3529 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3530 else
3531 {
3532 _bfd_error_handler
3533 /* xgettext:c-format */
3534 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3535 input_bfd, input_section,
3536 (uint64_t) rel->r_offset, name, (int) r);
3537 return false;
3538 }
3539 }
3540
3541 if (wrel != rel)
3542 *wrel = *rel;
3543 }
3544
3545 if (wrel != rel)
3546 {
3547 Elf_Internal_Shdr *rel_hdr;
3548 size_t deleted = rel - wrel;
3549
3550 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3551 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3552 if (rel_hdr->sh_size == 0)
3553 {
3554 /* It is too late to remove an empty reloc section. Leave
3555 one NONE reloc.
3556 ??? What is wrong with an empty section??? */
3557 rel_hdr->sh_size = rel_hdr->sh_entsize;
3558 deleted -= 1;
3559 }
3560 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3561 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3562 input_section->reloc_count -= deleted;
3563 }
3564
3565 return true;
3566 }
3567
3568 /* Finish up dynamic symbol handling. We set the contents of various
3569 dynamic sections here. */
3570
3571 static bool
3572 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3573 struct bfd_link_info *info,
3574 struct elf_link_hash_entry *h,
3575 Elf_Internal_Sym *sym)
3576 {
3577 struct elf_x86_link_hash_table *htab;
3578 unsigned plt_entry_size;
3579 struct elf_x86_link_hash_entry *eh;
3580 bool local_undefweak;
3581 bool use_plt_second;
3582
3583 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3584
3585 plt_entry_size = htab->plt.plt_entry_size;
3586
3587 /* Use the second PLT section only if there is .plt section. */
3588 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3589
3590 eh = (struct elf_x86_link_hash_entry *) h;
3591 if (eh->no_finish_dynamic_symbol)
3592 abort ();
3593
3594 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3595 resolved undefined weak symbols in executable so that their
3596 references have value 0 at run-time. */
3597 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3598
3599 if (h->plt.offset != (bfd_vma) -1)
3600 {
3601 bfd_vma plt_index, plt_offset;
3602 bfd_vma got_offset;
3603 Elf_Internal_Rela rel;
3604 bfd_byte *loc;
3605 asection *plt, *resolved_plt, *gotplt, *relplt;
3606
3607 /* When building a static executable, use .iplt, .igot.plt and
3608 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3609 if (htab->elf.splt != NULL)
3610 {
3611 plt = htab->elf.splt;
3612 gotplt = htab->elf.sgotplt;
3613 relplt = htab->elf.srelplt;
3614 }
3615 else
3616 {
3617 plt = htab->elf.iplt;
3618 gotplt = htab->elf.igotplt;
3619 relplt = htab->elf.irelplt;
3620 }
3621
3622 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3623
3624 /* Get the index in the procedure linkage table which
3625 corresponds to this symbol. This is the index of this symbol
3626 in all the symbols for which we are making plt entries. The
3627 first entry in the procedure linkage table is reserved.
3628
3629 Get the offset into the .got table of the entry that
3630 corresponds to this function. Each .got entry is 4 bytes.
3631 The first three are reserved.
3632
3633 For static executables, we don't reserve anything. */
3634
3635 if (plt == htab->elf.splt)
3636 {
3637 got_offset = (h->plt.offset / plt_entry_size
3638 - htab->plt.has_plt0);
3639 got_offset = (got_offset + 3) * 4;
3640 }
3641 else
3642 {
3643 got_offset = h->plt.offset / plt_entry_size;
3644 got_offset = got_offset * 4;
3645 }
3646
3647 /* Fill in the entry in the procedure linkage table and update
3648 the first slot. */
3649 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3650 plt_entry_size);
3651
3652 if (use_plt_second)
3653 {
3654 const bfd_byte *plt_entry;
3655 if (bfd_link_pic (info))
3656 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3657 else
3658 plt_entry = htab->non_lazy_plt->plt_entry;
3659 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3660 plt_entry, htab->non_lazy_plt->plt_entry_size);
3661
3662 resolved_plt = htab->plt_second;
3663 plt_offset = eh->plt_second.offset;
3664 }
3665 else
3666 {
3667 resolved_plt = plt;
3668 plt_offset = h->plt.offset;
3669 }
3670
3671 if (! bfd_link_pic (info))
3672 {
3673 bfd_put_32 (output_bfd,
3674 (gotplt->output_section->vma
3675 + gotplt->output_offset
3676 + got_offset),
3677 resolved_plt->contents + plt_offset
3678 + htab->plt.plt_got_offset);
3679
3680 if (htab->elf.target_os == is_vxworks)
3681 {
3682 int s, k, reloc_index;
3683
3684 /* Create the R_386_32 relocation referencing the GOT
3685 for this PLT entry. */
3686
3687 /* S: Current slot number (zero-based). */
3688 s = ((h->plt.offset - htab->plt.plt_entry_size)
3689 / htab->plt.plt_entry_size);
3690 /* K: Number of relocations for PLTResolve. */
3691 if (bfd_link_pic (info))
3692 k = PLTRESOLVE_RELOCS_SHLIB;
3693 else
3694 k = PLTRESOLVE_RELOCS;
3695 /* Skip the PLTresolve relocations, and the relocations for
3696 the other PLT slots. */
3697 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3698 loc = (htab->srelplt2->contents + reloc_index
3699 * sizeof (Elf32_External_Rel));
3700
3701 rel.r_offset = (plt->output_section->vma
3702 + plt->output_offset
3703 + h->plt.offset + 2),
3704 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3705 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3706
3707 /* Create the R_386_32 relocation referencing the beginning of
3708 the PLT for this GOT entry. */
3709 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3710 + htab->elf.sgotplt->output_offset
3711 + got_offset);
3712 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3713 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3714 loc + sizeof (Elf32_External_Rel));
3715 }
3716 }
3717 else
3718 {
3719 bfd_put_32 (output_bfd, got_offset,
3720 resolved_plt->contents + plt_offset
3721 + htab->plt.plt_got_offset);
3722 }
3723
3724 /* Fill in the entry in the global offset table. Leave the entry
3725 as zero for undefined weak symbol in PIE. No PLT relocation
3726 against undefined weak symbol in PIE. */
3727 if (!local_undefweak)
3728 {
3729 if (htab->plt.has_plt0)
3730 bfd_put_32 (output_bfd,
3731 (plt->output_section->vma
3732 + plt->output_offset
3733 + h->plt.offset
3734 + htab->lazy_plt->plt_lazy_offset),
3735 gotplt->contents + got_offset);
3736
3737 /* Fill in the entry in the .rel.plt section. */
3738 rel.r_offset = (gotplt->output_section->vma
3739 + gotplt->output_offset
3740 + got_offset);
3741 if (PLT_LOCAL_IFUNC_P (info, h))
3742 {
3743 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3744 h->root.root.string,
3745 h->root.u.def.section->owner);
3746
3747 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3748 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3749 in the .got.plt section. */
3750 bfd_put_32 (output_bfd,
3751 (h->root.u.def.value
3752 + h->root.u.def.section->output_section->vma
3753 + h->root.u.def.section->output_offset),
3754 gotplt->contents + got_offset);
3755 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3756
3757 if (htab->params->report_relative_reloc)
3758 _bfd_x86_elf_link_report_relative_reloc
3759 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3760
3761 /* R_386_IRELATIVE comes last. */
3762 plt_index = htab->next_irelative_index--;
3763 }
3764 else
3765 {
3766 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3767 plt_index = htab->next_jump_slot_index++;
3768 }
3769
3770 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3771 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3772
3773 /* Don't fill the second and third slots in PLT entry for
3774 static executables nor without PLT0. */
3775 if (plt == htab->elf.splt && htab->plt.has_plt0)
3776 {
3777 bfd_put_32 (output_bfd,
3778 plt_index * sizeof (Elf32_External_Rel),
3779 plt->contents + h->plt.offset
3780 + htab->lazy_plt->plt_reloc_offset);
3781 bfd_put_32 (output_bfd,
3782 - (h->plt.offset
3783 + htab->lazy_plt->plt_plt_offset + 4),
3784 (plt->contents + h->plt.offset
3785 + htab->lazy_plt->plt_plt_offset));
3786 }
3787 }
3788 }
3789 else if (eh->plt_got.offset != (bfd_vma) -1)
3790 {
3791 bfd_vma got_offset, plt_offset;
3792 asection *plt, *got, *gotplt;
3793 const bfd_byte *got_plt_entry;
3794
3795 /* Set the entry in the GOT procedure linkage table. */
3796 plt = htab->plt_got;
3797 got = htab->elf.sgot;
3798 gotplt = htab->elf.sgotplt;
3799 got_offset = h->got.offset;
3800
3801 if (got_offset == (bfd_vma) -1
3802 || plt == NULL
3803 || got == NULL
3804 || gotplt == NULL)
3805 abort ();
3806
3807 /* Fill in the entry in the GOT procedure linkage table. */
3808 if (! bfd_link_pic (info))
3809 {
3810 got_plt_entry = htab->non_lazy_plt->plt_entry;
3811 got_offset += got->output_section->vma + got->output_offset;
3812 }
3813 else
3814 {
3815 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3816 got_offset += (got->output_section->vma
3817 + got->output_offset
3818 - gotplt->output_section->vma
3819 - gotplt->output_offset);
3820 }
3821
3822 plt_offset = eh->plt_got.offset;
3823 memcpy (plt->contents + plt_offset, got_plt_entry,
3824 htab->non_lazy_plt->plt_entry_size);
3825 bfd_put_32 (output_bfd, got_offset,
3826 (plt->contents + plt_offset
3827 + htab->non_lazy_plt->plt_got_offset));
3828 }
3829
3830 if (!local_undefweak
3831 && !h->def_regular
3832 && (h->plt.offset != (bfd_vma) -1
3833 || eh->plt_got.offset != (bfd_vma) -1))
3834 {
3835 /* Mark the symbol as undefined, rather than as defined in
3836 the .plt section. Leave the value if there were any
3837 relocations where pointer equality matters (this is a clue
3838 for the dynamic linker, to make function pointer
3839 comparisons work between an application and shared
3840 library), otherwise set it to zero. If a function is only
3841 called from a binary, there is no need to slow down
3842 shared libraries because of that. */
3843 sym->st_shndx = SHN_UNDEF;
3844 if (!h->pointer_equality_needed)
3845 sym->st_value = 0;
3846 }
3847
3848 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3849
3850 /* Don't generate dynamic GOT relocation against undefined weak
3851 symbol in executable. */
3852 if (h->got.offset != (bfd_vma) -1
3853 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3854 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3855 && !local_undefweak)
3856 {
3857 Elf_Internal_Rela rel;
3858 asection *relgot = htab->elf.srelgot;
3859 const char *relative_reloc_name = NULL;
3860 bool generate_dynamic_reloc = true;
3861
3862 /* This symbol has an entry in the global offset table. Set it
3863 up. */
3864
3865 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3866 abort ();
3867
3868 rel.r_offset = (htab->elf.sgot->output_section->vma
3869 + htab->elf.sgot->output_offset
3870 + (h->got.offset & ~(bfd_vma) 1));
3871
3872 /* If this is a static link, or it is a -Bsymbolic link and the
3873 symbol is defined locally or was forced to be local because
3874 of a version file, we just want to emit a RELATIVE reloc.
3875 The entry in the global offset table will already have been
3876 initialized in the relocate_section function. */
3877 if (h->def_regular
3878 && h->type == STT_GNU_IFUNC)
3879 {
3880 if (h->plt.offset == (bfd_vma) -1)
3881 {
3882 /* STT_GNU_IFUNC is referenced without PLT. */
3883 if (htab->elf.splt == NULL)
3884 {
3885 /* use .rel[a].iplt section to store .got relocations
3886 in static executable. */
3887 relgot = htab->elf.irelplt;
3888 }
3889 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3890 {
3891 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3892 h->root.root.string,
3893 h->root.u.def.section->owner);
3894
3895 bfd_put_32 (output_bfd,
3896 (h->root.u.def.value
3897 + h->root.u.def.section->output_section->vma
3898 + h->root.u.def.section->output_offset),
3899 htab->elf.sgot->contents + h->got.offset);
3900 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3901 relative_reloc_name = "R_386_IRELATIVE";
3902 }
3903 else
3904 goto do_glob_dat;
3905 }
3906 else if (bfd_link_pic (info))
3907 {
3908 /* Generate R_386_GLOB_DAT. */
3909 goto do_glob_dat;
3910 }
3911 else
3912 {
3913 asection *plt;
3914 bfd_vma plt_offset;
3915
3916 if (!h->pointer_equality_needed)
3917 abort ();
3918
3919 /* For non-shared object, we can't use .got.plt, which
3920 contains the real function addres if we need pointer
3921 equality. We load the GOT entry with the PLT entry. */
3922 if (htab->plt_second != NULL)
3923 {
3924 plt = htab->plt_second;
3925 plt_offset = eh->plt_second.offset;
3926 }
3927 else
3928 {
3929 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3930 plt_offset = h->plt.offset;
3931 }
3932 bfd_put_32 (output_bfd,
3933 (plt->output_section->vma
3934 + plt->output_offset + plt_offset),
3935 htab->elf.sgot->contents + h->got.offset);
3936 return true;
3937 }
3938 }
3939 else if (bfd_link_pic (info)
3940 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3941 {
3942 BFD_ASSERT((h->got.offset & 1) != 0);
3943 if (info->enable_dt_relr)
3944 generate_dynamic_reloc = false;
3945 else
3946 {
3947 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3948 relative_reloc_name = "R_386_RELATIVE";
3949 }
3950 }
3951 else
3952 {
3953 BFD_ASSERT((h->got.offset & 1) == 0);
3954 do_glob_dat:
3955 bfd_put_32 (output_bfd, (bfd_vma) 0,
3956 htab->elf.sgot->contents + h->got.offset);
3957 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3958 }
3959
3960 if (generate_dynamic_reloc)
3961 {
3962 if (relative_reloc_name != NULL
3963 && htab->params->report_relative_reloc)
3964 _bfd_x86_elf_link_report_relative_reloc
3965 (info, relgot, h, sym, relative_reloc_name, &rel);
3966
3967 elf_append_rel (output_bfd, relgot, &rel);
3968 }
3969 }
3970
3971 if (h->needs_copy)
3972 {
3973 Elf_Internal_Rela rel;
3974 asection *s;
3975
3976 /* This symbol needs a copy reloc. Set it up. */
3977 VERIFY_COPY_RELOC (h, htab)
3978
3979 rel.r_offset = (h->root.u.def.value
3980 + h->root.u.def.section->output_section->vma
3981 + h->root.u.def.section->output_offset);
3982 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3983 if (h->root.u.def.section == htab->elf.sdynrelro)
3984 s = htab->elf.sreldynrelro;
3985 else
3986 s = htab->elf.srelbss;
3987 elf_append_rel (output_bfd, s, &rel);
3988 }
3989
3990 return true;
3991 }
3992
3993 /* Finish up local dynamic symbol handling. We set the contents of
3994 various dynamic sections here. */
3995
3996 static int
3997 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3998 {
3999 struct elf_link_hash_entry *h
4000 = (struct elf_link_hash_entry *) *slot;
4001 struct bfd_link_info *info
4002 = (struct bfd_link_info *) inf;
4003
4004 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4005 h, NULL);
4006 }
4007
4008 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4009 here since undefined weak symbol may not be dynamic and may not be
4010 called for elf_i386_finish_dynamic_symbol. */
4011
4012 static bool
4013 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4014 void *inf)
4015 {
4016 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4017 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4018
4019 if (h->root.type != bfd_link_hash_undefweak
4020 || h->dynindx != -1)
4021 return true;
4022
4023 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4024 info, h, NULL);
4025 }
4026
4027 /* Used to decide how to sort relocs in an optimal manner for the
4028 dynamic linker, before writing them out. */
4029
4030 static enum elf_reloc_type_class
4031 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4032 const asection *rel_sec ATTRIBUTE_UNUSED,
4033 const Elf_Internal_Rela *rela)
4034 {
4035 bfd *abfd = info->output_bfd;
4036 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4037 struct elf_link_hash_table *htab = elf_hash_table (info);
4038
4039 if (htab->dynsym != NULL
4040 && htab->dynsym->contents != NULL)
4041 {
4042 /* Check relocation against STT_GNU_IFUNC symbol if there are
4043 dynamic symbols. */
4044 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4045 if (r_symndx != STN_UNDEF)
4046 {
4047 Elf_Internal_Sym sym;
4048 if (!bed->s->swap_symbol_in (abfd,
4049 (htab->dynsym->contents
4050 + r_symndx * sizeof (Elf32_External_Sym)),
4051 0, &sym))
4052 abort ();
4053
4054 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4055 return reloc_class_ifunc;
4056 }
4057 }
4058
4059 switch (ELF32_R_TYPE (rela->r_info))
4060 {
4061 case R_386_IRELATIVE:
4062 return reloc_class_ifunc;
4063 case R_386_RELATIVE:
4064 return reloc_class_relative;
4065 case R_386_JUMP_SLOT:
4066 return reloc_class_plt;
4067 case R_386_COPY:
4068 return reloc_class_copy;
4069 default:
4070 return reloc_class_normal;
4071 }
4072 }
4073
4074 /* Finish up the dynamic sections. */
4075
4076 static bool
4077 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4078 struct bfd_link_info *info)
4079 {
4080 struct elf_x86_link_hash_table *htab;
4081
4082 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4083 if (htab == NULL)
4084 return false;
4085
4086 if (!htab->elf.dynamic_sections_created)
4087 return true;
4088
4089 if (htab->elf.splt && htab->elf.splt->size > 0)
4090 {
4091 if (bfd_is_abs_section (htab->elf.splt->output_section))
4092 {
4093 info->callbacks->einfo
4094 (_("%F%P: discarded output section: `%pA'\n"),
4095 htab->elf.splt);
4096 return false;
4097 }
4098
4099 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4100 really seem like the right value. */
4101 elf_section_data (htab->elf.splt->output_section)
4102 ->this_hdr.sh_entsize = 4;
4103
4104 if (htab->plt.has_plt0)
4105 {
4106 /* Fill in the special first entry in the procedure linkage
4107 table. */
4108 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4109 htab->lazy_plt->plt0_entry_size);
4110 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4111 htab->plt0_pad_byte,
4112 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4113 if (!bfd_link_pic (info))
4114 {
4115 bfd_put_32 (output_bfd,
4116 (htab->elf.sgotplt->output_section->vma
4117 + htab->elf.sgotplt->output_offset
4118 + 4),
4119 htab->elf.splt->contents
4120 + htab->lazy_plt->plt0_got1_offset);
4121 bfd_put_32 (output_bfd,
4122 (htab->elf.sgotplt->output_section->vma
4123 + htab->elf.sgotplt->output_offset
4124 + 8),
4125 htab->elf.splt->contents
4126 + htab->lazy_plt->plt0_got2_offset);
4127
4128 if (htab->elf.target_os == is_vxworks)
4129 {
4130 Elf_Internal_Rela rel;
4131 int num_plts = (htab->elf.splt->size
4132 / htab->plt.plt_entry_size) - 1;
4133 unsigned char *p;
4134 asection *srelplt2 = htab->srelplt2;
4135
4136 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4137 + 4. On IA32 we use REL relocations so the
4138 addend goes in the PLT directly. */
4139 rel.r_offset = (htab->elf.splt->output_section->vma
4140 + htab->elf.splt->output_offset
4141 + htab->lazy_plt->plt0_got1_offset);
4142 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4143 R_386_32);
4144 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4145 srelplt2->contents);
4146 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4147 + 8. */
4148 rel.r_offset = (htab->elf.splt->output_section->vma
4149 + htab->elf.splt->output_offset
4150 + htab->lazy_plt->plt0_got2_offset);
4151 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4152 R_386_32);
4153 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4154 srelplt2->contents +
4155 sizeof (Elf32_External_Rel));
4156 /* Correct the .rel.plt.unloaded relocations. */
4157 p = srelplt2->contents;
4158 if (bfd_link_pic (info))
4159 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4160 else
4161 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4162
4163 for (; num_plts; num_plts--)
4164 {
4165 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4166 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4167 R_386_32);
4168 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4169 p += sizeof (Elf32_External_Rel);
4170
4171 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4172 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4173 R_386_32);
4174 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4175 p += sizeof (Elf32_External_Rel);
4176 }
4177 }
4178 }
4179 }
4180 }
4181
4182 /* Fill PLT entries for undefined weak symbols in PIE. */
4183 if (bfd_link_pie (info))
4184 bfd_hash_traverse (&info->hash->table,
4185 elf_i386_pie_finish_undefweak_symbol,
4186 info);
4187
4188 return true;
4189 }
4190
4191 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4192 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4193 It has to be done before elf_link_sort_relocs is called so that
4194 dynamic relocations are properly sorted. */
4195
4196 static bool
4197 elf_i386_output_arch_local_syms
4198 (bfd *output_bfd ATTRIBUTE_UNUSED,
4199 struct bfd_link_info *info,
4200 void *flaginfo ATTRIBUTE_UNUSED,
4201 int (*func) (void *, const char *,
4202 Elf_Internal_Sym *,
4203 asection *,
4204 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4205 {
4206 struct elf_x86_link_hash_table *htab
4207 = elf_x86_hash_table (info, I386_ELF_DATA);
4208 if (htab == NULL)
4209 return false;
4210
4211 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4212 htab_traverse (htab->loc_hash_table,
4213 elf_i386_finish_local_dynamic_symbol,
4214 info);
4215
4216 return true;
4217 }
4218
4219 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4220 dynamic relocations. */
4221
4222 static long
4223 elf_i386_get_synthetic_symtab (bfd *abfd,
4224 long symcount ATTRIBUTE_UNUSED,
4225 asymbol **syms ATTRIBUTE_UNUSED,
4226 long dynsymcount,
4227 asymbol **dynsyms,
4228 asymbol **ret)
4229 {
4230 long count, i, n;
4231 int j;
4232 bfd_byte *plt_contents;
4233 long relsize;
4234 const struct elf_x86_lazy_plt_layout *lazy_plt;
4235 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4236 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4237 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4238 asection *plt;
4239 bfd_vma got_addr;
4240 enum elf_x86_plt_type plt_type;
4241 struct elf_x86_plt plts[] =
4242 {
4243 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4244 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4245 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4246 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4247 };
4248
4249 *ret = NULL;
4250
4251 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4252 return 0;
4253
4254 if (dynsymcount <= 0)
4255 return 0;
4256
4257 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4258 if (relsize <= 0)
4259 return -1;
4260
4261 non_lazy_plt = NULL;
4262 /* Silence GCC 6. */
4263 lazy_plt = NULL;
4264 non_lazy_ibt_plt = NULL;
4265 lazy_ibt_plt = NULL;
4266 switch (get_elf_backend_data (abfd)->target_os)
4267 {
4268 case is_normal:
4269 case is_solaris:
4270 non_lazy_plt = &elf_i386_non_lazy_plt;
4271 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4272 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4273 /* Fall through */
4274 case is_vxworks:
4275 lazy_plt = &elf_i386_lazy_plt;
4276 break;
4277 default:
4278 abort ();
4279 }
4280
4281 got_addr = 0;
4282
4283 count = 0;
4284 for (j = 0; plts[j].name != NULL; j++)
4285 {
4286 plt = bfd_get_section_by_name (abfd, plts[j].name);
4287 if (plt == NULL || plt->size == 0)
4288 continue;
4289
4290 /* Get the PLT section contents. */
4291 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4292 if (plt_contents == NULL)
4293 break;
4294 if (!bfd_get_section_contents (abfd, (asection *) plt,
4295 plt_contents, 0, plt->size))
4296 {
4297 free (plt_contents);
4298 break;
4299 }
4300
4301 /* Check what kind of PLT it is. */
4302 plt_type = plt_unknown;
4303 if (plts[j].type == plt_unknown
4304 && (plt->size >= (lazy_plt->plt0_entry_size
4305 + lazy_plt->plt_entry_size)))
4306 {
4307 /* Match lazy PLT first. */
4308 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4309 lazy_plt->plt0_got1_offset) == 0)
4310 {
4311 /* The fist entry in the lazy IBT PLT is the same as the
4312 normal lazy PLT. */
4313 if (lazy_ibt_plt != NULL
4314 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4315 lazy_ibt_plt->plt_entry,
4316 lazy_ibt_plt->plt_got_offset) == 0))
4317 plt_type = plt_lazy | plt_second;
4318 else
4319 plt_type = plt_lazy;
4320 }
4321 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4322 lazy_plt->plt0_got1_offset) == 0)
4323 {
4324 /* The fist entry in the PIC lazy IBT PLT is the same as
4325 the normal PIC lazy PLT. */
4326 if (lazy_ibt_plt != NULL
4327 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4328 lazy_ibt_plt->pic_plt_entry,
4329 lazy_ibt_plt->plt_got_offset) == 0))
4330 plt_type = plt_lazy | plt_pic | plt_second;
4331 else
4332 plt_type = plt_lazy | plt_pic;
4333 }
4334 }
4335
4336 if (non_lazy_plt != NULL
4337 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4338 && plt->size >= non_lazy_plt->plt_entry_size)
4339 {
4340 /* Match non-lazy PLT. */
4341 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4342 non_lazy_plt->plt_got_offset) == 0)
4343 plt_type = plt_non_lazy;
4344 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4345 non_lazy_plt->plt_got_offset) == 0)
4346 plt_type = plt_pic;
4347 }
4348
4349 if ((non_lazy_ibt_plt != NULL)
4350 && (plt_type == plt_unknown || plt_type == plt_second)
4351 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4352 {
4353 if (memcmp (plt_contents,
4354 non_lazy_ibt_plt->plt_entry,
4355 non_lazy_ibt_plt->plt_got_offset) == 0)
4356 {
4357 /* Match IBT PLT. */
4358 plt_type = plt_second;
4359 non_lazy_plt = non_lazy_ibt_plt;
4360 }
4361 else if (memcmp (plt_contents,
4362 non_lazy_ibt_plt->pic_plt_entry,
4363 non_lazy_ibt_plt->plt_got_offset) == 0)
4364 {
4365 /* Match PIC IBT PLT. */
4366 plt_type = plt_second | plt_pic;
4367 non_lazy_plt = non_lazy_ibt_plt;
4368 }
4369 }
4370
4371 if (plt_type == plt_unknown)
4372 {
4373 free (plt_contents);
4374 continue;
4375 }
4376
4377 plts[j].sec = plt;
4378 plts[j].type = plt_type;
4379
4380 if ((plt_type & plt_lazy))
4381 {
4382 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4383 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4384 /* Skip PLT0 in lazy PLT. */
4385 i = 1;
4386 }
4387 else
4388 {
4389 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4390 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4391 i = 0;
4392 }
4393
4394 /* Skip lazy PLT when the second PLT is used. */
4395 if ((plt_type & (plt_lazy | plt_second))
4396 == (plt_lazy | plt_second))
4397 plts[j].count = 0;
4398 else
4399 {
4400 n = plt->size / plts[j].plt_entry_size;
4401 plts[j].count = n;
4402 count += n - i;
4403 }
4404
4405 plts[j].contents = plt_contents;
4406
4407 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4408 if ((plt_type & plt_pic))
4409 got_addr = (bfd_vma) -1;
4410 }
4411
4412 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4413 got_addr, plts, dynsyms,
4414 ret);
4415 }
4416
4417 /* Set up i386 GNU properties. Return the first relocatable ELF input
4418 with GNU properties if found. Otherwise, return NULL. */
4419
4420 static bfd *
4421 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4422 {
4423 struct elf_x86_init_table init_table;
4424
4425 switch (get_elf_backend_data (info->output_bfd)->target_os)
4426 {
4427 case is_normal:
4428 case is_solaris:
4429 init_table.plt0_pad_byte = 0x0;
4430 init_table.lazy_plt = &elf_i386_lazy_plt;
4431 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4432 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4433 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4434 break;
4435 case is_vxworks:
4436 init_table.plt0_pad_byte = 0x90;
4437 init_table.lazy_plt = &elf_i386_lazy_plt;
4438 init_table.non_lazy_plt = NULL;
4439 init_table.lazy_ibt_plt = NULL;
4440 init_table.non_lazy_ibt_plt = NULL;
4441 break;
4442 default:
4443 abort ();
4444 }
4445
4446 init_table.r_info = elf32_r_info;
4447 init_table.r_sym = elf32_r_sym;
4448
4449 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4450 }
4451
4452 #define TARGET_LITTLE_SYM i386_elf32_vec
4453 #define TARGET_LITTLE_NAME "elf32-i386"
4454 #define ELF_ARCH bfd_arch_i386
4455 #define ELF_TARGET_ID I386_ELF_DATA
4456 #define ELF_MACHINE_CODE EM_386
4457 #define ELF_MAXPAGESIZE 0x1000
4458
4459 #define elf_backend_can_gc_sections 1
4460 #define elf_backend_can_refcount 1
4461 #define elf_backend_want_got_plt 1
4462 #define elf_backend_plt_readonly 1
4463 #define elf_backend_want_plt_sym 0
4464 #define elf_backend_got_header_size 12
4465 #define elf_backend_plt_alignment 4
4466 #define elf_backend_dtrel_excludes_plt 1
4467 #define elf_backend_caches_rawsize 1
4468 #define elf_backend_want_dynrelro 1
4469
4470 /* Support RELA for objdump of prelink objects. */
4471 #define elf_info_to_howto elf_i386_info_to_howto_rel
4472 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4473
4474 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4475 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4476 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4477 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4478
4479 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4480 #define elf_backend_always_size_sections elf_i386_always_size_sections
4481 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4482 #define elf_backend_fake_sections elf_i386_fake_sections
4483 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4484 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4485 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4486 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4487 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4488 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4489 #define elf_backend_relocate_section elf_i386_relocate_section
4490 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4491 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4492
4493 #define elf_backend_linux_prpsinfo32_ugid16 true
4494
4495 #define elf32_bed elf32_i386_bed
4496
4497 #include "elf32-target.h"
4498
4499 /* FreeBSD support. */
4500
4501 #undef TARGET_LITTLE_SYM
4502 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4503 #undef TARGET_LITTLE_NAME
4504 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4505 #undef ELF_OSABI
4506 #define ELF_OSABI ELFOSABI_FREEBSD
4507
4508 /* The kernel recognizes executables as valid only if they carry a
4509 "FreeBSD" label in the ELF header. So we put this label on all
4510 executables and (for simplicity) also all other object files. */
4511
4512 static bool
4513 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4514 {
4515 if (!_bfd_elf_init_file_header (abfd, info))
4516 return false;
4517
4518 #ifdef OLD_FREEBSD_ABI_LABEL
4519 {
4520 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4521 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4522 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4523 }
4524 #endif
4525 return true;
4526 }
4527
4528 #undef elf_backend_init_file_header
4529 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4530 #undef elf32_bed
4531 #define elf32_bed elf32_i386_fbsd_bed
4532
4533 #undef elf_backend_add_symbol_hook
4534
4535 #include "elf32-target.h"
4536
4537 #undef elf_backend_init_file_header
4538
4539 /* Solaris 2. */
4540
4541 #undef TARGET_LITTLE_SYM
4542 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4543 #undef TARGET_LITTLE_NAME
4544 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4545
4546 #undef ELF_TARGET_OS
4547 #define ELF_TARGET_OS is_solaris
4548
4549 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4550 objects won't be recognized. */
4551 #undef ELF_OSABI
4552
4553 #undef elf32_bed
4554 #define elf32_bed elf32_i386_sol2_bed
4555
4556 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4557 boundary. */
4558 #undef elf_backend_static_tls_alignment
4559 #define elf_backend_static_tls_alignment 8
4560
4561 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4562
4563 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4564 File, p.63. */
4565 #undef elf_backend_want_plt_sym
4566 #define elf_backend_want_plt_sym 1
4567
4568 #undef elf_backend_strtab_flags
4569 #define elf_backend_strtab_flags SHF_STRINGS
4570
4571 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4572 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4573 FALSE otherwise. ISECTION is the best guess matching section from the
4574 input bfd IBFD, but it might be NULL. */
4575
4576 static bool
4577 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4578 bfd *obfd ATTRIBUTE_UNUSED,
4579 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4580 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4581 {
4582 /* PR 19938: FIXME: Need to add code for setting the sh_info
4583 and sh_link fields of Solaris specific section types. */
4584 return false;
4585
4586 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4587 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4588
4589 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4590
4591 The following values should be set:
4592
4593 Type Link Info
4594 -----------------------------------------------------------------------------
4595 SHT_SUNW_ancillary The section header index of 0
4596 [0x6fffffee] the associated string table.
4597
4598 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4599 [0x6ffffff0] the associated symbol table. section header index of
4600 the associated
4601 SHT_SUNW_capchain table,
4602 otherwise 0.
4603
4604 SHT_SUNW_symsort The section header index of 0
4605 [0x6ffffff1] the associated symbol table.
4606
4607 SHT_SUNW_tlssort The section header index of 0
4608 [0x6ffffff2] the associated symbol table.
4609
4610 SHT_SUNW_LDYNSYM The section header index of One greater than the
4611 [0x6ffffff3] the associated string table. symbol table index of the
4612 This index is the same string last local symbol,
4613 table used by the SHT_DYNSYM STB_LOCAL. Since
4614 section. SHT_SUNW_LDYNSYM only
4615 contains local symbols,
4616 sh_info is equivalent to
4617 the number of symbols in
4618 the table.
4619
4620 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4621 [0x6ffffff5] the section header index of to named strings, the
4622 the associated section header index of
4623 SHT_SUNW_capinfo table, the associated string
4624 otherwise 0. table, otherwise 0.
4625
4626 SHT_SUNW_move The section header index of 0
4627 [0x6ffffffa] the associated symbol table.
4628
4629 SHT_SUNW_COMDAT 0 0
4630 [0x6ffffffb]
4631
4632 SHT_SUNW_syminfo The section header index of The section header index
4633 [0x6ffffffc] the associated symbol table. of the associated
4634 .dynamic section.
4635
4636 SHT_SUNW_verdef The section header index of The number of version
4637 [0x6ffffffd] the associated string table. definitions within the
4638 section.
4639
4640 SHT_SUNW_verneed The section header index of The number of version
4641 [0x6ffffffe] the associated string table. dependencies within the
4642 section.
4643
4644 SHT_SUNW_versym The section header index of 0
4645 [0x6fffffff] the associated symbol table. */
4646 }
4647
4648 #undef elf_backend_copy_special_section_fields
4649 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4650
4651 #include "elf32-target.h"
4652
4653 /* Intel MCU support. */
4654
4655 static bool
4656 elf32_iamcu_elf_object_p (bfd *abfd)
4657 {
4658 /* Set the right machine number for an IAMCU elf32 file. */
4659 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4660 return true;
4661 }
4662
4663 #undef TARGET_LITTLE_SYM
4664 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4665 #undef TARGET_LITTLE_NAME
4666 #define TARGET_LITTLE_NAME "elf32-iamcu"
4667 #undef ELF_ARCH
4668 #define ELF_ARCH bfd_arch_iamcu
4669
4670 #undef ELF_MACHINE_CODE
4671 #define ELF_MACHINE_CODE EM_IAMCU
4672
4673 #undef ELF_TARGET_OS
4674 #undef ELF_OSABI
4675
4676 #undef elf32_bed
4677 #define elf32_bed elf32_iamcu_bed
4678
4679 #undef elf_backend_object_p
4680 #define elf_backend_object_p elf32_iamcu_elf_object_p
4681
4682 #undef elf_backend_static_tls_alignment
4683
4684 #undef elf_backend_want_plt_sym
4685 #define elf_backend_want_plt_sym 0
4686
4687 #undef elf_backend_strtab_flags
4688 #undef elf_backend_copy_special_section_fields
4689
4690 #include "elf32-target.h"
4691
4692 /* Restore defaults. */
4693 #undef ELF_ARCH
4694 #define ELF_ARCH bfd_arch_i386
4695 #undef ELF_MACHINE_CODE
4696 #define ELF_MACHINE_CODE EM_386
4697 #undef elf_backend_object_p
4698
4699 /* VxWorks support. */
4700
4701 #undef TARGET_LITTLE_SYM
4702 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4703 #undef TARGET_LITTLE_NAME
4704 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4705 #undef ELF_OSABI
4706 #undef ELF_MAXPAGESIZE
4707 #define ELF_MAXPAGESIZE 0x1000
4708 #undef elf_backend_plt_alignment
4709 #define elf_backend_plt_alignment 4
4710
4711 #undef ELF_TARGET_OS
4712 #define ELF_TARGET_OS is_vxworks
4713
4714 #undef elf_backend_relocs_compatible
4715 #undef elf_backend_add_symbol_hook
4716 #define elf_backend_add_symbol_hook \
4717 elf_vxworks_add_symbol_hook
4718 #undef elf_backend_link_output_symbol_hook
4719 #define elf_backend_link_output_symbol_hook \
4720 elf_vxworks_link_output_symbol_hook
4721 #undef elf_backend_emit_relocs
4722 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4723 #undef elf_backend_final_write_processing
4724 #define elf_backend_final_write_processing \
4725 elf_vxworks_final_write_processing
4726 #undef elf_backend_static_tls_alignment
4727
4728 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4729 define it. */
4730 #undef elf_backend_want_plt_sym
4731 #define elf_backend_want_plt_sym 1
4732
4733 #undef elf32_bed
4734 #define elf32_bed elf32_i386_vxworks_bed
4735
4736 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.