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[binutils-gdb.git] / bfd / elf32-i386.c
blob6183d962a831437157734ff43c2a755291932f0e
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_elf_mmap_section_contents (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)
1936 _bfd_elf_munmap_section_contents (sec, 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 _bfd_elf_munmap_section_contents (sec, contents);
1955 sec->check_relocs_failed = 1;
1956 return false;
1957 }
1958
1959 static bool
1960 elf_i386_early_size_sections (bfd *output_bfd, struct bfd_link_info *info)
1961 {
1962 bfd *abfd;
1963
1964 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
1965 for (abfd = info->input_bfds;
1966 abfd != (bfd *) NULL;
1967 abfd = abfd->link.next)
1968 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
1969 && !_bfd_elf_link_iterate_on_relocs (abfd, info,
1970 elf_i386_scan_relocs))
1971 return false;
1972
1973 return _bfd_x86_elf_early_size_sections (output_bfd, info);
1974 }
1975
1976 /* Set the correct type for an x86 ELF section. We do this by the
1977 section name, which is a hack, but ought to work. */
1978
1979 static bool
1980 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1981 Elf_Internal_Shdr *hdr,
1982 asection *sec)
1983 {
1984 const char *name;
1985
1986 name = bfd_section_name (sec);
1987
1988 /* This is an ugly, but unfortunately necessary hack that is
1989 needed when producing EFI binaries on x86. It tells
1990 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1991 containing ELF relocation info. We need this hack in order to
1992 be able to generate ELF binaries that can be translated into
1993 EFI applications (which are essentially COFF objects). Those
1994 files contain a COFF ".reloc" section inside an ELFNN object,
1995 which would normally cause BFD to segfault because it would
1996 attempt to interpret this section as containing relocation
1997 entries for section "oc". With this hack enabled, ".reloc"
1998 will be treated as a normal data section, which will avoid the
1999 segfault. However, you won't be able to create an ELFNN binary
2000 with a section named "oc" that needs relocations, but that's
2001 the kind of ugly side-effects you get when detecting section
2002 types based on their names... In practice, this limitation is
2003 unlikely to bite. */
2004 if (strcmp (name, ".reloc") == 0)
2005 hdr->sh_type = SHT_PROGBITS;
2006
2007 return true;
2008 }
2009
2010 /* Return the relocation value for @tpoff relocation
2011 if STT_TLS virtual address is ADDRESS. */
2012
2013 static bfd_vma
2014 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2015 {
2016 struct elf_link_hash_table *htab = elf_hash_table (info);
2017 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2018 bfd_vma static_tls_size;
2019
2020 /* If tls_sec is NULL, we should have signalled an error already. */
2021 if (htab->tls_sec == NULL)
2022 return 0;
2023
2024 /* Consider special static TLS alignment requirements. */
2025 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2026 return static_tls_size + htab->tls_sec->vma - address;
2027 }
2028
2029 /* Relocate an i386 ELF section. */
2030
2031 static int
2032 elf_i386_relocate_section (bfd *output_bfd,
2033 struct bfd_link_info *info,
2034 bfd *input_bfd,
2035 asection *input_section,
2036 bfd_byte *contents,
2037 Elf_Internal_Rela *relocs,
2038 Elf_Internal_Sym *local_syms,
2039 asection **local_sections)
2040 {
2041 struct elf_x86_link_hash_table *htab;
2042 Elf_Internal_Shdr *symtab_hdr;
2043 struct elf_link_hash_entry **sym_hashes;
2044 bfd_vma *local_got_offsets;
2045 bfd_vma *local_tlsdesc_gotents;
2046 Elf_Internal_Rela *rel;
2047 Elf_Internal_Rela *wrel;
2048 Elf_Internal_Rela *relend;
2049 bool is_vxworks_tls;
2050 unsigned expected_tls_le;
2051 unsigned plt_entry_size;
2052
2053 /* Skip if check_relocs or scan_relocs failed. */
2054 if (input_section->check_relocs_failed)
2055 return false;
2056
2057 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2058 if (htab == NULL)
2059 return false;
2060
2061 if (!is_x86_elf (input_bfd, htab))
2062 {
2063 bfd_set_error (bfd_error_wrong_format);
2064 return false;
2065 }
2066
2067 symtab_hdr = &elf_symtab_hdr (input_bfd);
2068 sym_hashes = elf_sym_hashes (input_bfd);
2069 local_got_offsets = elf_local_got_offsets (input_bfd);
2070 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2071 /* We have to handle relocations in vxworks .tls_vars sections
2072 specially, because the dynamic loader is 'weird'. */
2073 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2074 && bfd_link_pic (info)
2075 && !strcmp (input_section->output_section->name,
2076 ".tls_vars"));
2077
2078 _bfd_x86_elf_set_tls_module_base (info);
2079
2080 plt_entry_size = htab->plt.plt_entry_size;
2081
2082 rel = wrel = relocs;
2083 relend = relocs + input_section->reloc_count;
2084 for (; rel < relend; wrel++, rel++)
2085 {
2086 unsigned int r_type, r_type_tls;
2087 reloc_howto_type *howto;
2088 unsigned long r_symndx;
2089 struct elf_link_hash_entry *h;
2090 struct elf_x86_link_hash_entry *eh;
2091 Elf_Internal_Sym *sym;
2092 asection *sec;
2093 bfd_vma off, offplt, plt_offset;
2094 bfd_vma relocation;
2095 bool unresolved_reloc;
2096 bfd_reloc_status_type r;
2097 unsigned int indx;
2098 int tls_type;
2099 bfd_vma st_size;
2100 asection *resolved_plt;
2101 bool resolved_to_zero;
2102 bool relative_reloc;
2103
2104 r_type = ELF32_R_TYPE (rel->r_info);
2105 if (r_type == R_386_GNU_VTINHERIT
2106 || r_type == R_386_GNU_VTENTRY)
2107 {
2108 if (wrel != rel)
2109 *wrel = *rel;
2110 continue;
2111 }
2112
2113 howto = elf_i386_rtype_to_howto (r_type);
2114 if (howto == NULL)
2115 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2116
2117 r_symndx = ELF32_R_SYM (rel->r_info);
2118 h = NULL;
2119 sym = NULL;
2120 sec = NULL;
2121 unresolved_reloc = false;
2122 if (r_symndx < symtab_hdr->sh_info)
2123 {
2124 sym = local_syms + r_symndx;
2125 sec = local_sections[r_symndx];
2126 relocation = (sec->output_section->vma
2127 + sec->output_offset
2128 + sym->st_value);
2129 st_size = sym->st_size;
2130
2131 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2132 && ((sec->flags & SEC_MERGE) != 0
2133 || (bfd_link_relocatable (info)
2134 && sec->output_offset != 0)))
2135 {
2136 bfd_vma addend;
2137 bfd_byte *where = contents + rel->r_offset;
2138
2139 switch (bfd_get_reloc_size (howto))
2140 {
2141 case 1:
2142 addend = bfd_get_8 (input_bfd, where);
2143 if (howto->pc_relative)
2144 {
2145 addend = (addend ^ 0x80) - 0x80;
2146 addend += 1;
2147 }
2148 break;
2149 case 2:
2150 addend = bfd_get_16 (input_bfd, where);
2151 if (howto->pc_relative)
2152 {
2153 addend = (addend ^ 0x8000) - 0x8000;
2154 addend += 2;
2155 }
2156 break;
2157 case 4:
2158 addend = bfd_get_32 (input_bfd, where);
2159 if (howto->pc_relative)
2160 {
2161 addend = (addend ^ 0x80000000) - 0x80000000;
2162 addend += 4;
2163 }
2164 break;
2165 default:
2166 abort ();
2167 }
2168
2169 if (bfd_link_relocatable (info))
2170 addend += sec->output_offset;
2171 else
2172 {
2173 asection *msec = sec;
2174 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2175 addend);
2176 addend -= relocation;
2177 addend += msec->output_section->vma + msec->output_offset;
2178 }
2179
2180 switch (bfd_get_reloc_size (howto))
2181 {
2182 case 1:
2183 /* FIXME: overflow checks. */
2184 if (howto->pc_relative)
2185 addend -= 1;
2186 bfd_put_8 (input_bfd, addend, where);
2187 break;
2188 case 2:
2189 if (howto->pc_relative)
2190 addend -= 2;
2191 bfd_put_16 (input_bfd, addend, where);
2192 break;
2193 case 4:
2194 if (howto->pc_relative)
2195 addend -= 4;
2196 bfd_put_32 (input_bfd, addend, where);
2197 break;
2198 }
2199 }
2200 else if (!bfd_link_relocatable (info)
2201 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2202 {
2203 /* Relocate against local STT_GNU_IFUNC symbol. */
2204 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2205 false);
2206 if (h == NULL)
2207 abort ();
2208
2209 /* Set STT_GNU_IFUNC symbol value. */
2210 h->root.u.def.value = sym->st_value;
2211 h->root.u.def.section = sec;
2212 }
2213 }
2214 else
2215 {
2216 bool warned ATTRIBUTE_UNUSED;
2217 bool ignored ATTRIBUTE_UNUSED;
2218
2219 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2220 r_symndx, symtab_hdr, sym_hashes,
2221 h, sec, relocation,
2222 unresolved_reloc, warned, ignored);
2223 st_size = h->size;
2224 }
2225
2226 if (sec != NULL && discarded_section (sec))
2227 {
2228 _bfd_clear_contents (howto, input_bfd, input_section,
2229 contents, rel->r_offset);
2230 wrel->r_offset = rel->r_offset;
2231 wrel->r_info = 0;
2232 wrel->r_addend = 0;
2233
2234 /* For ld -r, remove relocations in debug sections against
2235 sections defined in discarded sections. Not done for
2236 eh_frame editing code expects to be present. */
2237 if (bfd_link_relocatable (info)
2238 && (input_section->flags & SEC_DEBUGGING))
2239 wrel--;
2240
2241 continue;
2242 }
2243
2244 if (bfd_link_relocatable (info))
2245 {
2246 if (wrel != rel)
2247 *wrel = *rel;
2248 continue;
2249 }
2250
2251 eh = (struct elf_x86_link_hash_entry *) h;
2252
2253 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2254 it here if it is defined in a non-shared object. */
2255 if (h != NULL
2256 && h->type == STT_GNU_IFUNC
2257 && h->def_regular)
2258 {
2259 asection *gotplt, *base_got;
2260 bfd_vma plt_index;
2261 const char *name;
2262
2263 if ((input_section->flags & SEC_ALLOC) == 0)
2264 {
2265 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2266 STT_GNU_IFUNC symbol as STT_FUNC. */
2267 if (elf_section_type (input_section) == SHT_NOTE)
2268 goto skip_ifunc;
2269 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2270 sections because such sections are not SEC_ALLOC and
2271 thus ld.so will not process them. */
2272 if ((input_section->flags & SEC_DEBUGGING) != 0)
2273 continue;
2274 abort ();
2275 }
2276
2277 /* STT_GNU_IFUNC symbol must go through PLT. */
2278 if (htab->elf.splt != NULL)
2279 {
2280 if (htab->plt_second != NULL)
2281 {
2282 resolved_plt = htab->plt_second;
2283 plt_offset = eh->plt_second.offset;
2284 }
2285 else
2286 {
2287 resolved_plt = htab->elf.splt;
2288 plt_offset = h->plt.offset;
2289 }
2290 gotplt = htab->elf.sgotplt;
2291 }
2292 else
2293 {
2294 resolved_plt = htab->elf.iplt;
2295 plt_offset = h->plt.offset;
2296 gotplt = htab->elf.igotplt;
2297 }
2298
2299 switch (r_type)
2300 {
2301 default:
2302 break;
2303
2304 case R_386_GOT32:
2305 case R_386_GOT32X:
2306 base_got = htab->elf.sgot;
2307 off = h->got.offset;
2308
2309 if (base_got == NULL)
2310 abort ();
2311
2312 if (off == (bfd_vma) -1)
2313 {
2314 /* We can't use h->got.offset here to save state, or
2315 even just remember the offset, as finish_dynamic_symbol
2316 would use that as offset into .got. */
2317
2318 if (h->plt.offset == (bfd_vma) -1)
2319 abort ();
2320
2321 if (htab->elf.splt != NULL)
2322 {
2323 plt_index = (h->plt.offset / plt_entry_size
2324 - htab->plt.has_plt0);
2325 off = (plt_index + 3) * 4;
2326 base_got = htab->elf.sgotplt;
2327 }
2328 else
2329 {
2330 plt_index = h->plt.offset / plt_entry_size;
2331 off = plt_index * 4;
2332 base_got = htab->elf.igotplt;
2333 }
2334
2335 if (h->dynindx == -1
2336 || h->forced_local
2337 || info->symbolic)
2338 {
2339 /* This references the local defitionion. We must
2340 initialize this entry in the global offset table.
2341 Since the offset must always be a multiple of 4,
2342 we use the least significant bit to record
2343 whether we have initialized it already.
2344
2345 When doing a dynamic link, we create a .rela.got
2346 relocation entry to initialize the value. This
2347 is done in the finish_dynamic_symbol routine. */
2348 if ((off & 1) != 0)
2349 off &= ~1;
2350 else
2351 {
2352 bfd_put_32 (output_bfd, relocation,
2353 base_got->contents + off);
2354 h->got.offset |= 1;
2355 }
2356 }
2357
2358 relocation = off;
2359 }
2360 else
2361 relocation = (base_got->output_section->vma
2362 + base_got->output_offset + off
2363 - gotplt->output_section->vma
2364 - gotplt->output_offset);
2365
2366 if (rel->r_offset > 1
2367 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2368 && *(contents + rel->r_offset - 2) != 0x8d)
2369 {
2370 if (bfd_link_pic (info))
2371 goto disallow_got32;
2372
2373 /* Add the GOT base if there is no base register. */
2374 relocation += (gotplt->output_section->vma
2375 + gotplt->output_offset);
2376 }
2377 else if (htab->elf.splt == NULL)
2378 {
2379 /* Adjust for static executables. */
2380 relocation += gotplt->output_offset;
2381 }
2382
2383 goto do_relocation;
2384 }
2385
2386 if (h->plt.offset == (bfd_vma) -1)
2387 {
2388 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2389 if (r_type == R_386_32
2390 && (input_section->flags & SEC_CODE) == 0)
2391 goto do_ifunc_pointer;
2392 goto bad_ifunc_reloc;
2393 }
2394
2395 relocation = (resolved_plt->output_section->vma
2396 + resolved_plt->output_offset + plt_offset);
2397
2398 switch (r_type)
2399 {
2400 default:
2401 bad_ifunc_reloc:
2402 if (h->root.root.string)
2403 name = h->root.root.string;
2404 else
2405 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2406 NULL);
2407 _bfd_error_handler
2408 /* xgettext:c-format */
2409 (_("%pB: relocation %s against STT_GNU_IFUNC "
2410 "symbol `%s' isn't supported"), input_bfd,
2411 howto->name, name);
2412 bfd_set_error (bfd_error_bad_value);
2413 return false;
2414
2415 case R_386_32:
2416 /* Generate dynamic relcoation only when there is a
2417 non-GOT reference in a shared object. */
2418 if ((bfd_link_pic (info) && h->non_got_ref)
2419 || h->plt.offset == (bfd_vma) -1)
2420 {
2421 Elf_Internal_Rela outrel;
2422 asection *sreloc;
2423 bfd_vma offset;
2424
2425 do_ifunc_pointer:
2426 /* Need a dynamic relocation to get the real function
2427 adddress. */
2428 offset = _bfd_elf_section_offset (output_bfd,
2429 info,
2430 input_section,
2431 rel->r_offset);
2432 if (offset == (bfd_vma) -1
2433 || offset == (bfd_vma) -2)
2434 abort ();
2435
2436 outrel.r_offset = (input_section->output_section->vma
2437 + input_section->output_offset
2438 + offset);
2439
2440 if (POINTER_LOCAL_IFUNC_P (info, h))
2441 {
2442 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2443 h->root.root.string,
2444 h->root.u.def.section->owner);
2445
2446 /* This symbol is resolved locally. */
2447 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2448
2449 if (htab->params->report_relative_reloc)
2450 _bfd_x86_elf_link_report_relative_reloc
2451 (info, input_section, h, sym,
2452 "R_386_IRELATIVE", &outrel);
2453
2454 bfd_put_32 (output_bfd,
2455 (h->root.u.def.value
2456 + h->root.u.def.section->output_section->vma
2457 + h->root.u.def.section->output_offset),
2458 contents + offset);
2459 }
2460 else
2461 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2462
2463 /* Dynamic relocations are stored in
2464 1. .rel.ifunc section in PIC object.
2465 2. .rel.got section in dynamic executable.
2466 3. .rel.iplt section in static executable. */
2467 if (bfd_link_pic (info))
2468 sreloc = htab->elf.irelifunc;
2469 else if (htab->elf.splt != NULL)
2470 sreloc = htab->elf.srelgot;
2471 else
2472 sreloc = htab->elf.irelplt;
2473 elf_append_rel (output_bfd, sreloc, &outrel);
2474
2475 /* If this reloc is against an external symbol, we
2476 do not want to fiddle with the addend. Otherwise,
2477 we need to include the symbol value so that it
2478 becomes an addend for the dynamic reloc. For an
2479 internal symbol, we have updated addend. */
2480 continue;
2481 }
2482 /* FALLTHROUGH */
2483 case R_386_PC32:
2484 case R_386_PLT32:
2485 goto do_relocation;
2486
2487 case R_386_GOTOFF:
2488 /* NB: We can't use the PLT entry as the function address
2489 for PIC since the PIC register may not be set up
2490 properly for indirect call. */
2491 if (bfd_link_pic (info))
2492 goto bad_ifunc_reloc;
2493 relocation -= (gotplt->output_section->vma
2494 + gotplt->output_offset);
2495 goto do_relocation;
2496 }
2497 }
2498
2499 skip_ifunc:
2500 resolved_to_zero = (eh != NULL
2501 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2502
2503 switch (r_type)
2504 {
2505 case R_386_GOT32X:
2506 case R_386_GOT32:
2507 /* Relocation is to the entry for this symbol in the global
2508 offset table. */
2509 if (htab->elf.sgot == NULL)
2510 abort ();
2511
2512 relative_reloc = false;
2513 if (h != NULL)
2514 {
2515 off = h->got.offset;
2516 if (RESOLVED_LOCALLY_P (info, h, htab))
2517 {
2518 /* We must initialize this entry in the global offset
2519 table. Since the offset must always be a multiple
2520 of 4, we use the least significant bit to record
2521 whether we have initialized it already.
2522
2523 When doing a dynamic link, we create a .rel.got
2524 relocation entry to initialize the value. This
2525 is done in the finish_dynamic_symbol routine. */
2526 if ((off & 1) != 0)
2527 off &= ~1;
2528 else
2529 {
2530 bfd_put_32 (output_bfd, relocation,
2531 htab->elf.sgot->contents + off);
2532 h->got.offset |= 1;
2533 /* NB: Don't generate relative relocation here if
2534 it has been generated by DT_RELR. */
2535 if (!info->enable_dt_relr
2536 && GENERATE_RELATIVE_RELOC_P (info, h))
2537 {
2538 /* PR ld/21402: If this symbol isn't dynamic
2539 in PIC, generate R_386_RELATIVE here. */
2540 eh->no_finish_dynamic_symbol = 1;
2541 relative_reloc = true;
2542 }
2543 }
2544 }
2545 else
2546 unresolved_reloc = false;
2547 }
2548 else
2549 {
2550 if (local_got_offsets == NULL)
2551 abort ();
2552
2553 off = local_got_offsets[r_symndx];
2554
2555 /* The offset must always be a multiple of 4. We use
2556 the least significant bit to record whether we have
2557 already generated the necessary reloc. */
2558 if ((off & 1) != 0)
2559 off &= ~1;
2560 else
2561 {
2562 bfd_put_32 (output_bfd, relocation,
2563 htab->elf.sgot->contents + off);
2564 local_got_offsets[r_symndx] |= 1;
2565
2566 /* NB: Don't generate relative relocation here if it
2567 has been generated by DT_RELR. */
2568 if (!info->enable_dt_relr && bfd_link_pic (info))
2569 relative_reloc = true;
2570 }
2571 }
2572
2573 if (relative_reloc)
2574 {
2575 asection *s;
2576 Elf_Internal_Rela outrel;
2577
2578 s = htab->elf.srelgot;
2579 if (s == NULL)
2580 abort ();
2581
2582 outrel.r_offset = (htab->elf.sgot->output_section->vma
2583 + htab->elf.sgot->output_offset
2584 + off);
2585 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2586
2587 if (htab->params->report_relative_reloc)
2588 _bfd_x86_elf_link_report_relative_reloc
2589 (info, input_section, h, sym, "R_386_RELATIVE",
2590 &outrel);
2591
2592 elf_append_rel (output_bfd, s, &outrel);
2593 }
2594
2595 if (off >= (bfd_vma) -2)
2596 abort ();
2597
2598 relocation = (htab->elf.sgot->output_section->vma
2599 + htab->elf.sgot->output_offset + off);
2600 if (rel->r_offset > 1
2601 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2602 && *(contents + rel->r_offset - 2) != 0x8d)
2603 {
2604 if (bfd_link_pic (info))
2605 {
2606 /* For PIC, disallow R_386_GOT32 without a base
2607 register, except for "lea foo@GOT, %reg", since
2608 we don't know what the GOT base is. */
2609 const char *name;
2610
2611 disallow_got32:
2612 if (h == NULL || h->root.root.string == NULL)
2613 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2614 NULL);
2615 else
2616 name = h->root.root.string;
2617
2618 _bfd_error_handler
2619 /* xgettext:c-format */
2620 (_("%pB: direct GOT relocation %s against `%s'"
2621 " without base register can not be used"
2622 " when making a shared object"),
2623 input_bfd, howto->name, name);
2624 bfd_set_error (bfd_error_bad_value);
2625 return false;
2626 }
2627 }
2628 else
2629 {
2630 /* Subtract the .got.plt section address only with a base
2631 register. */
2632 relocation -= (htab->elf.sgotplt->output_section->vma
2633 + htab->elf.sgotplt->output_offset);
2634 }
2635
2636 break;
2637
2638 case R_386_GOTOFF:
2639 /* Relocation is relative to the start of the global offset
2640 table. */
2641
2642 /* Check to make sure it isn't a protected function or data
2643 symbol for shared library since it may not be local when
2644 used as function address or with copy relocation. We also
2645 need to make sure that a symbol is referenced locally. */
2646 if (!bfd_link_executable (info) && h)
2647 {
2648 if (!h->def_regular)
2649 {
2650 const char *v;
2651
2652 switch (ELF_ST_VISIBILITY (h->other))
2653 {
2654 case STV_HIDDEN:
2655 v = _("hidden symbol");
2656 break;
2657 case STV_INTERNAL:
2658 v = _("internal symbol");
2659 break;
2660 case STV_PROTECTED:
2661 v = _("protected symbol");
2662 break;
2663 default:
2664 v = _("symbol");
2665 break;
2666 }
2667
2668 _bfd_error_handler
2669 /* xgettext:c-format */
2670 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2671 " `%s' can not be used when making a shared object"),
2672 input_bfd, v, h->root.root.string);
2673 bfd_set_error (bfd_error_bad_value);
2674 return false;
2675 }
2676 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2677 && (h->type == STT_FUNC
2678 || h->type == STT_OBJECT)
2679 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2680 {
2681 _bfd_error_handler
2682 /* xgettext:c-format */
2683 (_("%pB: relocation R_386_GOTOFF against protected %s"
2684 " `%s' can not be used when making a shared object"),
2685 input_bfd,
2686 h->type == STT_FUNC ? "function" : "data",
2687 h->root.root.string);
2688 bfd_set_error (bfd_error_bad_value);
2689 return false;
2690 }
2691 }
2692
2693 /* Note that sgot is not involved in this
2694 calculation. We always want the start of .got.plt. If we
2695 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2696 permitted by the ABI, we might have to change this
2697 calculation. */
2698 relocation -= htab->elf.sgotplt->output_section->vma
2699 + htab->elf.sgotplt->output_offset;
2700 break;
2701
2702 case R_386_GOTPC:
2703 /* Use global offset table as symbol value. */
2704 relocation = htab->elf.sgotplt->output_section->vma
2705 + htab->elf.sgotplt->output_offset;
2706 unresolved_reloc = false;
2707 break;
2708
2709 case R_386_PLT32:
2710 /* Relocation is to the entry for this symbol in the
2711 procedure linkage table. */
2712
2713 /* Resolve a PLT32 reloc against a local symbol directly,
2714 without using the procedure linkage table. */
2715 if (h == NULL)
2716 break;
2717
2718 if ((h->plt.offset == (bfd_vma) -1
2719 && eh->plt_got.offset == (bfd_vma) -1)
2720 || htab->elf.splt == NULL)
2721 {
2722 /* We didn't make a PLT entry for this symbol. This
2723 happens when statically linking PIC code, or when
2724 using -Bsymbolic. */
2725 break;
2726 }
2727
2728 if (h->plt.offset != (bfd_vma) -1)
2729 {
2730 if (htab->plt_second != NULL)
2731 {
2732 resolved_plt = htab->plt_second;
2733 plt_offset = eh->plt_second.offset;
2734 }
2735 else
2736 {
2737 resolved_plt = htab->elf.splt;
2738 plt_offset = h->plt.offset;
2739 }
2740 }
2741 else
2742 {
2743 resolved_plt = htab->plt_got;
2744 plt_offset = eh->plt_got.offset;
2745 }
2746
2747 relocation = (resolved_plt->output_section->vma
2748 + resolved_plt->output_offset
2749 + plt_offset);
2750 unresolved_reloc = false;
2751 break;
2752
2753 case R_386_SIZE32:
2754 /* Set to symbol size. */
2755 relocation = st_size;
2756 /* Fall through. */
2757
2758 case R_386_32:
2759 case R_386_PC32:
2760 if ((input_section->flags & SEC_ALLOC) == 0
2761 || is_vxworks_tls)
2762 break;
2763
2764 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2765 sec, false,
2766 resolved_to_zero,
2767 (r_type == R_386_PC32)))
2768 {
2769 Elf_Internal_Rela outrel;
2770 bool skip, relocate;
2771 bool generate_dynamic_reloc = true;
2772 asection *sreloc;
2773
2774 /* When generating a shared object, these relocations
2775 are copied into the output file to be resolved at run
2776 time. */
2777
2778 skip = false;
2779 relocate = false;
2780
2781 outrel.r_offset =
2782 _bfd_elf_section_offset (output_bfd, info, input_section,
2783 rel->r_offset);
2784 if (outrel.r_offset == (bfd_vma) -1)
2785 skip = true;
2786 else if (outrel.r_offset == (bfd_vma) -2)
2787 skip = true, relocate = true;
2788 outrel.r_offset += (input_section->output_section->vma
2789 + input_section->output_offset);
2790
2791 if (skip)
2792 memset (&outrel, 0, sizeof outrel);
2793 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2794 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2795 else
2796 {
2797 /* This symbol is local, or marked to become local. */
2798 relocate = true;
2799 /* NB: Don't generate relative relocation here if it
2800 has been generated by DT_RELR. */
2801 if (info->enable_dt_relr)
2802 generate_dynamic_reloc = false;
2803 else
2804 {
2805 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2806
2807 if (htab->params->report_relative_reloc)
2808 _bfd_x86_elf_link_report_relative_reloc
2809 (info, input_section, h, sym, "R_386_RELATIVE",
2810 &outrel);
2811 }
2812 }
2813
2814 if (generate_dynamic_reloc)
2815 {
2816 sreloc = elf_section_data (input_section)->sreloc;
2817
2818 if (sreloc == NULL || sreloc->contents == NULL)
2819 {
2820 r = bfd_reloc_notsupported;
2821 goto check_relocation_error;
2822 }
2823
2824 elf_append_rel (output_bfd, sreloc, &outrel);
2825 }
2826
2827 /* If this reloc is against an external symbol, we do
2828 not want to fiddle with the addend. Otherwise, we
2829 need to include the symbol value so that it becomes
2830 an addend for the dynamic reloc. */
2831 if (! relocate)
2832 continue;
2833 }
2834 break;
2835
2836 case R_386_TLS_IE:
2837 if (!bfd_link_executable (info))
2838 {
2839 Elf_Internal_Rela outrel;
2840 asection *sreloc;
2841
2842 outrel.r_offset = rel->r_offset
2843 + input_section->output_section->vma
2844 + input_section->output_offset;
2845 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2846
2847 if (htab->params->report_relative_reloc)
2848 _bfd_x86_elf_link_report_relative_reloc
2849 (info, input_section, h, sym, "R_386_RELATIVE",
2850 &outrel);
2851
2852 sreloc = elf_section_data (input_section)->sreloc;
2853 if (sreloc == NULL)
2854 abort ();
2855 elf_append_rel (output_bfd, sreloc, &outrel);
2856 }
2857 /* Fall through */
2858
2859 case R_386_TLS_GD:
2860 case R_386_TLS_GOTDESC:
2861 case R_386_TLS_DESC_CALL:
2862 case R_386_TLS_IE_32:
2863 case R_386_TLS_GOTIE:
2864 tls_type = GOT_UNKNOWN;
2865 if (h == NULL && local_got_offsets)
2866 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2867 else if (h != NULL)
2868 tls_type = elf_x86_hash_entry(h)->tls_type;
2869 if (tls_type == GOT_TLS_IE)
2870 tls_type = GOT_TLS_IE_NEG;
2871
2872 r_type_tls = r_type;
2873 if (! elf_i386_tls_transition (info, input_bfd,
2874 input_section, contents,
2875 symtab_hdr, sym_hashes,
2876 &r_type_tls, tls_type, rel,
2877 relend, h, r_symndx, true))
2878 return false;
2879
2880 expected_tls_le = htab->elf.target_os == is_solaris
2881 ? R_386_TLS_LE : R_386_TLS_LE_32;
2882 if (r_type_tls == expected_tls_le)
2883 {
2884 /* NB: Solaris only supports R_386_TLS_GD->R_386_TLS_LE. */
2885 BFD_ASSERT (! unresolved_reloc
2886 && (htab->elf.target_os != is_solaris
2887 || (htab->elf.target_os == is_solaris
2888 && (r_type == R_386_TLS_GD
2889 || r_type == R_386_TLS_IE
2890 || r_type == R_386_TLS_GOTIE))));
2891 if (r_type == R_386_TLS_GD)
2892 {
2893 unsigned int type;
2894 bfd_vma roff;
2895
2896 /* GD->LE transition. */
2897 type = *(contents + rel->r_offset - 2);
2898 if (type == 0x04)
2899 {
2900 /* Change
2901 leal foo@tlsgd(,%ebx,1), %eax
2902 call ___tls_get_addr@PLT
2903 into:
2904 movl %gs:0, %eax
2905 subl $foo@tpoff, %eax
2906 (6 byte form of subl). */
2907 roff = rel->r_offset + 5;
2908 }
2909 else
2910 {
2911 /* Change
2912 leal foo@tlsgd(%ebx), %eax
2913 call ___tls_get_addr@PLT
2914 nop
2915 or
2916 leal foo@tlsgd(%reg), %eax
2917 call *___tls_get_addr@GOT(%reg)
2918 which may be converted to
2919 addr32 call ___tls_get_addr
2920 into:
2921 movl %gs:0, %eax; subl $foo@tpoff, %eax
2922 (6 byte form of subl). */
2923 roff = rel->r_offset + 6;
2924 }
2925 memcpy (contents + roff - 8,
2926 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2927 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2928 contents + roff);
2929 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2930 rel++;
2931 wrel++;
2932 continue;
2933 }
2934 else if (r_type == R_386_TLS_GOTDESC)
2935 {
2936 /* GDesc -> LE transition.
2937 It's originally something like:
2938 leal x@tlsdesc(%ebx), %eax
2939
2940 leal x@ntpoff, %eax
2941
2942 Registers other than %eax may be set up here. */
2943
2944 unsigned int val;
2945 bfd_vma roff;
2946
2947 roff = rel->r_offset;
2948 val = bfd_get_8 (input_bfd, contents + roff - 1);
2949
2950 /* Now modify the instruction as appropriate. */
2951 /* aoliva FIXME: remove the above and xor the byte
2952 below with 0x86. */
2953 bfd_put_8 (output_bfd, val ^ 0x86,
2954 contents + roff - 1);
2955 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2956 contents + roff);
2957 continue;
2958 }
2959 else if (r_type == R_386_TLS_DESC_CALL)
2960 {
2961 /* GDesc -> LE transition.
2962 It's originally:
2963 call *(%eax)
2964 Turn it into:
2965 xchg %ax,%ax */
2966
2967 bfd_vma roff;
2968
2969 roff = rel->r_offset;
2970 bfd_put_8 (output_bfd, 0x66, contents + roff);
2971 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2972 continue;
2973 }
2974 else if (r_type == R_386_TLS_IE)
2975 {
2976 unsigned int val;
2977
2978 /* IE->LE transition:
2979 Originally it can be one of:
2980 movl foo, %eax
2981 movl foo, %reg
2982 addl foo, %reg
2983 We change it into:
2984 movl $foo, %eax
2985 movl $foo, %reg
2986 addl $foo, %reg. */
2987 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2988 if (val == 0xa1)
2989 {
2990 /* movl foo, %eax. */
2991 bfd_put_8 (output_bfd, 0xb8,
2992 contents + rel->r_offset - 1);
2993 }
2994 else
2995 {
2996 unsigned int type;
2997
2998 type = bfd_get_8 (input_bfd,
2999 contents + rel->r_offset - 2);
3000 switch (type)
3001 {
3002 case 0x8b:
3003 /* movl */
3004 bfd_put_8 (output_bfd, 0xc7,
3005 contents + rel->r_offset - 2);
3006 bfd_put_8 (output_bfd,
3007 0xc0 | ((val >> 3) & 7),
3008 contents + rel->r_offset - 1);
3009 break;
3010 case 0x03:
3011 /* addl */
3012 bfd_put_8 (output_bfd, 0x81,
3013 contents + rel->r_offset - 2);
3014 bfd_put_8 (output_bfd,
3015 0xc0 | ((val >> 3) & 7),
3016 contents + rel->r_offset - 1);
3017 break;
3018 default:
3019 BFD_FAIL ();
3020 break;
3021 }
3022 }
3023 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3024 contents + rel->r_offset);
3025 continue;
3026 }
3027 else
3028 {
3029 unsigned int val, type;
3030
3031 /* {IE_32,GOTIE}->LE transition:
3032 Originally it can be one of:
3033 subl foo(%reg1), %reg2
3034 movl foo(%reg1), %reg2
3035 addl foo(%reg1), %reg2
3036 We change it into:
3037 subl $foo, %reg2
3038 movl $foo, %reg2 (6 byte form)
3039 addl $foo, %reg2. */
3040 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3041 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3042 if (type == 0x8b)
3043 {
3044 /* movl */
3045 bfd_put_8 (output_bfd, 0xc7,
3046 contents + rel->r_offset - 2);
3047 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3048 contents + rel->r_offset - 1);
3049 }
3050 else if (type == 0x2b)
3051 {
3052 /* subl */
3053 bfd_put_8 (output_bfd, 0x81,
3054 contents + rel->r_offset - 2);
3055 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3056 contents + rel->r_offset - 1);
3057 }
3058 else if (type == 0x03)
3059 {
3060 /* addl */
3061 bfd_put_8 (output_bfd, 0x81,
3062 contents + rel->r_offset - 2);
3063 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3064 contents + rel->r_offset - 1);
3065 }
3066 else
3067 BFD_FAIL ();
3068 if (r_type == R_386_TLS_GOTIE)
3069 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3070 contents + rel->r_offset);
3071 else
3072 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3073 contents + rel->r_offset);
3074 continue;
3075 }
3076 }
3077
3078 if (htab->elf.sgot == NULL)
3079 abort ();
3080
3081 if (h != NULL)
3082 {
3083 off = h->got.offset;
3084 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3085 }
3086 else
3087 {
3088 if (local_got_offsets == NULL)
3089 abort ();
3090
3091 off = local_got_offsets[r_symndx];
3092 offplt = local_tlsdesc_gotents[r_symndx];
3093 }
3094
3095 if ((off & 1) != 0)
3096 off &= ~1;
3097 else
3098 {
3099 Elf_Internal_Rela outrel;
3100 int dr_type;
3101 asection *sreloc;
3102
3103 if (htab->elf.srelgot == NULL)
3104 abort ();
3105
3106 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3107
3108 if (GOT_TLS_GDESC_P (tls_type))
3109 {
3110 bfd_byte *loc;
3111 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3112 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3113 <= htab->elf.sgotplt->size);
3114 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3115 + htab->elf.sgotplt->output_offset
3116 + offplt
3117 + htab->sgotplt_jump_table_size);
3118 sreloc = htab->elf.srelplt;
3119 loc = sreloc->contents;
3120 loc += (htab->next_tls_desc_index++
3121 * sizeof (Elf32_External_Rel));
3122 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3123 <= sreloc->contents + sreloc->size);
3124 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3125 if (indx == 0)
3126 {
3127 BFD_ASSERT (! unresolved_reloc);
3128 bfd_put_32 (output_bfd,
3129 relocation - _bfd_x86_elf_dtpoff_base (info),
3130 htab->elf.sgotplt->contents + offplt
3131 + htab->sgotplt_jump_table_size + 4);
3132 }
3133 else
3134 {
3135 bfd_put_32 (output_bfd, 0,
3136 htab->elf.sgotplt->contents + offplt
3137 + htab->sgotplt_jump_table_size + 4);
3138 }
3139 }
3140
3141 sreloc = htab->elf.srelgot;
3142
3143 outrel.r_offset = (htab->elf.sgot->output_section->vma
3144 + htab->elf.sgot->output_offset + off);
3145
3146 if (GOT_TLS_GD_P (tls_type))
3147 dr_type = R_386_TLS_DTPMOD32;
3148 else if (GOT_TLS_GDESC_P (tls_type))
3149 goto dr_done;
3150 else if (tls_type == GOT_TLS_IE_POS)
3151 dr_type = R_386_TLS_TPOFF;
3152 else
3153 dr_type = R_386_TLS_TPOFF32;
3154
3155 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3156 bfd_put_32 (output_bfd,
3157 relocation - _bfd_x86_elf_dtpoff_base (info),
3158 htab->elf.sgot->contents + off);
3159 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3160 bfd_put_32 (output_bfd,
3161 _bfd_x86_elf_dtpoff_base (info) - relocation,
3162 htab->elf.sgot->contents + off);
3163 else if (dr_type != R_386_TLS_DESC)
3164 bfd_put_32 (output_bfd, 0,
3165 htab->elf.sgot->contents + off);
3166 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3167
3168 elf_append_rel (output_bfd, sreloc, &outrel);
3169
3170 if (GOT_TLS_GD_P (tls_type))
3171 {
3172 if (indx == 0)
3173 {
3174 BFD_ASSERT (! unresolved_reloc);
3175 bfd_put_32 (output_bfd,
3176 relocation - _bfd_x86_elf_dtpoff_base (info),
3177 htab->elf.sgot->contents + off + 4);
3178 }
3179 else
3180 {
3181 bfd_put_32 (output_bfd, 0,
3182 htab->elf.sgot->contents + off + 4);
3183 outrel.r_info = ELF32_R_INFO (indx,
3184 R_386_TLS_DTPOFF32);
3185 outrel.r_offset += 4;
3186 elf_append_rel (output_bfd, sreloc, &outrel);
3187 }
3188 }
3189 else if (tls_type == GOT_TLS_IE_BOTH)
3190 {
3191 bfd_put_32 (output_bfd,
3192 (indx == 0
3193 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3194 : 0),
3195 htab->elf.sgot->contents + off + 4);
3196 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3197 outrel.r_offset += 4;
3198 elf_append_rel (output_bfd, sreloc, &outrel);
3199 }
3200
3201 dr_done:
3202 if (h != NULL)
3203 h->got.offset |= 1;
3204 else
3205 local_got_offsets[r_symndx] |= 1;
3206 }
3207
3208 if (off >= (bfd_vma) -2
3209 && ! GOT_TLS_GDESC_P (tls_type))
3210 abort ();
3211 if (r_type_tls == R_386_TLS_GOTDESC
3212 || r_type_tls == R_386_TLS_DESC_CALL)
3213 {
3214 relocation = htab->sgotplt_jump_table_size + offplt;
3215 unresolved_reloc = false;
3216 }
3217 else if (r_type_tls == r_type)
3218 {
3219 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3220 + htab->elf.sgotplt->output_offset;
3221 relocation = htab->elf.sgot->output_section->vma
3222 + htab->elf.sgot->output_offset + off - g_o_t;
3223 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3224 && tls_type == GOT_TLS_IE_BOTH)
3225 relocation += 4;
3226 if (r_type == R_386_TLS_IE)
3227 relocation += g_o_t;
3228 unresolved_reloc = false;
3229 }
3230 else if (r_type == R_386_TLS_GD)
3231 {
3232 unsigned int val, type;
3233 bfd_vma roff;
3234
3235 /* GD->IE transition. */
3236 type = *(contents + rel->r_offset - 2);
3237 val = *(contents + rel->r_offset - 1);
3238 if (type == 0x04)
3239 {
3240 /* Change
3241 leal foo@tlsgd(,%ebx,1), %eax
3242 call ___tls_get_addr@PLT
3243 into:
3244 movl %gs:0, %eax
3245 subl $foo@gottpoff(%ebx), %eax. */
3246 val >>= 3;
3247 roff = rel->r_offset - 3;
3248 }
3249 else
3250 {
3251 /* Change
3252 leal foo@tlsgd(%ebx), %eax
3253 call ___tls_get_addr@PLT
3254 nop
3255 or
3256 leal foo@tlsgd(%reg), %eax
3257 call *___tls_get_addr@GOT(%reg)
3258 which may be converted to
3259 addr32 call ___tls_get_addr
3260 into:
3261 movl %gs:0, %eax;
3262 subl $foo@gottpoff(%reg), %eax. */
3263 roff = rel->r_offset - 2;
3264 }
3265 memcpy (contents + roff,
3266 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3267 contents[roff + 7] = 0x80 | (val & 7);
3268 /* If foo is used only with foo@gotntpoff(%reg) and
3269 foo@indntpoff, but not with foo@gottpoff(%reg), change
3270 subl $foo@gottpoff(%reg), %eax
3271 into:
3272 addl $foo@gotntpoff(%reg), %eax. */
3273 if (tls_type == GOT_TLS_IE_POS)
3274 contents[roff + 6] = 0x03;
3275 bfd_put_32 (output_bfd,
3276 htab->elf.sgot->output_section->vma
3277 + htab->elf.sgot->output_offset + off
3278 - htab->elf.sgotplt->output_section->vma
3279 - htab->elf.sgotplt->output_offset,
3280 contents + roff + 8);
3281 /* Skip R_386_PLT32 and R_386_GOT32X. */
3282 rel++;
3283 wrel++;
3284 continue;
3285 }
3286 else if (r_type == R_386_TLS_GOTDESC)
3287 {
3288 /* GDesc -> IE transition.
3289 It's originally something like:
3290 leal x@tlsdesc(%ebx), %eax
3291
3292 Change it to:
3293 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3294 or:
3295 movl x@gottpoff(%ebx), %eax # before negl %eax
3296
3297 Registers other than %eax may be set up here. */
3298
3299 bfd_vma roff;
3300
3301 /* First, make sure it's a leal adding ebx to a 32-bit
3302 offset into any register, although it's probably
3303 almost always going to be eax. */
3304 roff = rel->r_offset;
3305
3306 /* Now modify the instruction as appropriate. */
3307 /* To turn a leal into a movl in the form we use it, it
3308 suffices to change the first byte from 0x8d to 0x8b.
3309 aoliva FIXME: should we decide to keep the leal, all
3310 we have to do is remove the statement below, and
3311 adjust the relaxation of R_386_TLS_DESC_CALL. */
3312 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3313
3314 if (tls_type == GOT_TLS_IE_BOTH)
3315 off += 4;
3316
3317 bfd_put_32 (output_bfd,
3318 htab->elf.sgot->output_section->vma
3319 + htab->elf.sgot->output_offset + off
3320 - htab->elf.sgotplt->output_section->vma
3321 - htab->elf.sgotplt->output_offset,
3322 contents + roff);
3323 continue;
3324 }
3325 else if (r_type == R_386_TLS_DESC_CALL)
3326 {
3327 /* GDesc -> IE transition.
3328 It's originally:
3329 call *(%eax)
3330
3331 Change it to:
3332 xchg %ax,%ax
3333 or
3334 negl %eax
3335 depending on how we transformed the TLS_GOTDESC above.
3336 */
3337
3338 bfd_vma roff;
3339
3340 roff = rel->r_offset;
3341
3342 /* Now modify the instruction as appropriate. */
3343 if (tls_type != GOT_TLS_IE_NEG)
3344 {
3345 /* xchg %ax,%ax */
3346 bfd_put_8 (output_bfd, 0x66, contents + roff);
3347 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3348 }
3349 else
3350 {
3351 /* negl %eax */
3352 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3353 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3354 }
3355
3356 continue;
3357 }
3358 else
3359 BFD_ASSERT (false);
3360 break;
3361
3362 case R_386_TLS_LDM:
3363 if (! elf_i386_tls_transition (info, input_bfd,
3364 input_section, contents,
3365 symtab_hdr, sym_hashes,
3366 &r_type, GOT_UNKNOWN, rel,
3367 relend, h, r_symndx, true))
3368 return false;
3369
3370 if (r_type != R_386_TLS_LDM)
3371 {
3372 /* LD->LE transition. Change
3373 leal foo@tlsldm(%ebx) %eax
3374 call ___tls_get_addr@PLT
3375 into:
3376 movl %gs:0, %eax
3377 nop
3378 leal 0(%esi,1), %esi
3379 or change
3380 leal foo@tlsldm(%reg) %eax
3381 call *___tls_get_addr@GOT(%reg)
3382 which may be converted to
3383 addr32 call ___tls_get_addr
3384 into:
3385 movl %gs:0, %eax
3386 leal 0(%esi), %esi */
3387 expected_tls_le = htab->elf.target_os == is_solaris
3388 ? R_386_TLS_LE : R_386_TLS_LE_32;
3389 BFD_ASSERT (r_type == expected_tls_le);
3390 if (*(contents + rel->r_offset + 4) == 0xff
3391 || *(contents + rel->r_offset + 4) == 0x67)
3392 memcpy (contents + rel->r_offset - 2,
3393 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3394 else
3395 memcpy (contents + rel->r_offset - 2,
3396 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3397 /* Skip R_386_PC32/R_386_PLT32. */
3398 rel++;
3399 wrel++;
3400 continue;
3401 }
3402
3403 if (htab->elf.sgot == NULL)
3404 abort ();
3405
3406 off = htab->tls_ld_or_ldm_got.offset;
3407 if (off & 1)
3408 off &= ~1;
3409 else
3410 {
3411 Elf_Internal_Rela outrel;
3412
3413 if (htab->elf.srelgot == NULL)
3414 abort ();
3415
3416 outrel.r_offset = (htab->elf.sgot->output_section->vma
3417 + htab->elf.sgot->output_offset + off);
3418
3419 bfd_put_32 (output_bfd, 0,
3420 htab->elf.sgot->contents + off);
3421 bfd_put_32 (output_bfd, 0,
3422 htab->elf.sgot->contents + off + 4);
3423 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3424 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3425 htab->tls_ld_or_ldm_got.offset |= 1;
3426 }
3427 relocation = htab->elf.sgot->output_section->vma
3428 + htab->elf.sgot->output_offset + off
3429 - htab->elf.sgotplt->output_section->vma
3430 - htab->elf.sgotplt->output_offset;
3431 unresolved_reloc = false;
3432 break;
3433
3434 case R_386_TLS_LDO_32:
3435 if (!bfd_link_executable (info)
3436 || (input_section->flags & SEC_CODE) == 0)
3437 relocation -= _bfd_x86_elf_dtpoff_base (info);
3438 else
3439 /* When converting LDO to LE, we must negate. */
3440 relocation = -elf_i386_tpoff (info, relocation);
3441 break;
3442
3443 case R_386_TLS_LE_32:
3444 case R_386_TLS_LE:
3445 if (!bfd_link_executable (info))
3446 {
3447 Elf_Internal_Rela outrel;
3448 asection *sreloc;
3449
3450 outrel.r_offset = rel->r_offset
3451 + input_section->output_section->vma
3452 + input_section->output_offset;
3453 if (h != NULL && h->dynindx != -1)
3454 indx = h->dynindx;
3455 else
3456 indx = 0;
3457 if (r_type == R_386_TLS_LE_32)
3458 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3459 else
3460 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3461 sreloc = elf_section_data (input_section)->sreloc;
3462 if (sreloc == NULL)
3463 abort ();
3464 elf_append_rel (output_bfd, sreloc, &outrel);
3465 if (indx)
3466 continue;
3467 else if (r_type == R_386_TLS_LE_32)
3468 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3469 else
3470 relocation -= _bfd_x86_elf_dtpoff_base (info);
3471 }
3472 else if (r_type == R_386_TLS_LE_32)
3473 relocation = elf_i386_tpoff (info, relocation);
3474 else
3475 relocation = -elf_i386_tpoff (info, relocation);
3476 break;
3477
3478 default:
3479 break;
3480 }
3481
3482 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3483 because such sections are not SEC_ALLOC and thus ld.so will
3484 not process them. */
3485 if (unresolved_reloc
3486 && !((input_section->flags & SEC_DEBUGGING) != 0
3487 && h->def_dynamic)
3488 && _bfd_elf_section_offset (output_bfd, info, input_section,
3489 rel->r_offset) != (bfd_vma) -1)
3490 {
3491 _bfd_error_handler
3492 /* xgettext:c-format */
3493 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3494 input_bfd,
3495 input_section,
3496 (uint64_t) rel->r_offset,
3497 howto->name,
3498 h->root.root.string);
3499 return false;
3500 }
3501
3502 do_relocation:
3503 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3504 contents, rel->r_offset,
3505 relocation, 0);
3506
3507 check_relocation_error:
3508 if (r != bfd_reloc_ok)
3509 {
3510 const char *name;
3511
3512 if (h != NULL)
3513 name = h->root.root.string;
3514 else
3515 {
3516 name = bfd_elf_string_from_elf_section (input_bfd,
3517 symtab_hdr->sh_link,
3518 sym->st_name);
3519 if (name == NULL)
3520 return false;
3521 if (*name == '\0')
3522 name = bfd_section_name (sec);
3523 }
3524
3525 if (r == bfd_reloc_overflow)
3526 (*info->callbacks->reloc_overflow)
3527 (info, (h ? &h->root : NULL), name, howto->name,
3528 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3529 else
3530 {
3531 _bfd_error_handler
3532 /* xgettext:c-format */
3533 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3534 input_bfd, input_section,
3535 (uint64_t) rel->r_offset, name, (int) r);
3536 return false;
3537 }
3538 }
3539
3540 if (wrel != rel)
3541 *wrel = *rel;
3542 }
3543
3544 if (wrel != rel)
3545 {
3546 Elf_Internal_Shdr *rel_hdr;
3547 size_t deleted = rel - wrel;
3548
3549 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3550 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3551 if (rel_hdr->sh_size == 0)
3552 {
3553 /* It is too late to remove an empty reloc section. Leave
3554 one NONE reloc.
3555 ??? What is wrong with an empty section??? */
3556 rel_hdr->sh_size = rel_hdr->sh_entsize;
3557 deleted -= 1;
3558 }
3559 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3560 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3561 input_section->reloc_count -= deleted;
3562 }
3563
3564 return true;
3565 }
3566
3567 /* Finish up dynamic symbol handling. We set the contents of various
3568 dynamic sections here. */
3569
3570 static bool
3571 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3572 struct bfd_link_info *info,
3573 struct elf_link_hash_entry *h,
3574 Elf_Internal_Sym *sym)
3575 {
3576 struct elf_x86_link_hash_table *htab;
3577 unsigned plt_entry_size;
3578 struct elf_x86_link_hash_entry *eh;
3579 bool local_undefweak;
3580 bool use_plt_second;
3581
3582 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3583
3584 plt_entry_size = htab->plt.plt_entry_size;
3585
3586 /* Use the second PLT section only if there is .plt section. */
3587 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3588
3589 eh = (struct elf_x86_link_hash_entry *) h;
3590 if (eh->no_finish_dynamic_symbol)
3591 abort ();
3592
3593 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3594 resolved undefined weak symbols in executable so that their
3595 references have value 0 at run-time. */
3596 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3597
3598 if (h->plt.offset != (bfd_vma) -1)
3599 {
3600 bfd_vma plt_index, plt_offset;
3601 bfd_vma got_offset;
3602 Elf_Internal_Rela rel;
3603 bfd_byte *loc;
3604 asection *plt, *resolved_plt, *gotplt, *relplt;
3605
3606 /* When building a static executable, use .iplt, .igot.plt and
3607 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3608 if (htab->elf.splt != NULL)
3609 {
3610 plt = htab->elf.splt;
3611 gotplt = htab->elf.sgotplt;
3612 relplt = htab->elf.srelplt;
3613 }
3614 else
3615 {
3616 plt = htab->elf.iplt;
3617 gotplt = htab->elf.igotplt;
3618 relplt = htab->elf.irelplt;
3619 }
3620
3621 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3622
3623 /* Get the index in the procedure linkage table which
3624 corresponds to this symbol. This is the index of this symbol
3625 in all the symbols for which we are making plt entries. The
3626 first entry in the procedure linkage table is reserved.
3627
3628 Get the offset into the .got table of the entry that
3629 corresponds to this function. Each .got entry is 4 bytes.
3630 The first three are reserved.
3631
3632 For static executables, we don't reserve anything. */
3633
3634 if (plt == htab->elf.splt)
3635 {
3636 got_offset = (h->plt.offset / plt_entry_size
3637 - htab->plt.has_plt0);
3638 got_offset = (got_offset + 3) * 4;
3639 }
3640 else
3641 {
3642 got_offset = h->plt.offset / plt_entry_size;
3643 got_offset = got_offset * 4;
3644 }
3645
3646 /* Fill in the entry in the procedure linkage table and update
3647 the first slot. */
3648 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3649 plt_entry_size);
3650
3651 if (use_plt_second)
3652 {
3653 const bfd_byte *plt_entry;
3654 if (bfd_link_pic (info))
3655 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3656 else
3657 plt_entry = htab->non_lazy_plt->plt_entry;
3658 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3659 plt_entry, htab->non_lazy_plt->plt_entry_size);
3660
3661 resolved_plt = htab->plt_second;
3662 plt_offset = eh->plt_second.offset;
3663 }
3664 else
3665 {
3666 resolved_plt = plt;
3667 plt_offset = h->plt.offset;
3668 }
3669
3670 if (! bfd_link_pic (info))
3671 {
3672 bfd_put_32 (output_bfd,
3673 (gotplt->output_section->vma
3674 + gotplt->output_offset
3675 + got_offset),
3676 resolved_plt->contents + plt_offset
3677 + htab->plt.plt_got_offset);
3678
3679 if (htab->elf.target_os == is_vxworks)
3680 {
3681 int s, k, reloc_index;
3682
3683 /* Create the R_386_32 relocation referencing the GOT
3684 for this PLT entry. */
3685
3686 /* S: Current slot number (zero-based). */
3687 s = ((h->plt.offset - htab->plt.plt_entry_size)
3688 / htab->plt.plt_entry_size);
3689 /* K: Number of relocations for PLTResolve. */
3690 if (bfd_link_pic (info))
3691 k = PLTRESOLVE_RELOCS_SHLIB;
3692 else
3693 k = PLTRESOLVE_RELOCS;
3694 /* Skip the PLTresolve relocations, and the relocations for
3695 the other PLT slots. */
3696 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3697 loc = (htab->srelplt2->contents + reloc_index
3698 * sizeof (Elf32_External_Rel));
3699
3700 rel.r_offset = (plt->output_section->vma
3701 + plt->output_offset
3702 + h->plt.offset + 2),
3703 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3704 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3705
3706 /* Create the R_386_32 relocation referencing the beginning of
3707 the PLT for this GOT entry. */
3708 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3709 + htab->elf.sgotplt->output_offset
3710 + got_offset);
3711 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3712 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3713 loc + sizeof (Elf32_External_Rel));
3714 }
3715 }
3716 else
3717 {
3718 bfd_put_32 (output_bfd, got_offset,
3719 resolved_plt->contents + plt_offset
3720 + htab->plt.plt_got_offset);
3721 }
3722
3723 /* Fill in the entry in the global offset table. Leave the entry
3724 as zero for undefined weak symbol in PIE. No PLT relocation
3725 against undefined weak symbol in PIE. */
3726 if (!local_undefweak)
3727 {
3728 if (htab->plt.has_plt0)
3729 bfd_put_32 (output_bfd,
3730 (plt->output_section->vma
3731 + plt->output_offset
3732 + h->plt.offset
3733 + htab->lazy_plt->plt_lazy_offset),
3734 gotplt->contents + got_offset);
3735
3736 /* Fill in the entry in the .rel.plt section. */
3737 rel.r_offset = (gotplt->output_section->vma
3738 + gotplt->output_offset
3739 + got_offset);
3740 if (PLT_LOCAL_IFUNC_P (info, h))
3741 {
3742 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3743 h->root.root.string,
3744 h->root.u.def.section->owner);
3745
3746 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3747 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3748 in the .got.plt section. */
3749 bfd_put_32 (output_bfd,
3750 (h->root.u.def.value
3751 + h->root.u.def.section->output_section->vma
3752 + h->root.u.def.section->output_offset),
3753 gotplt->contents + got_offset);
3754 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3755
3756 if (htab->params->report_relative_reloc)
3757 _bfd_x86_elf_link_report_relative_reloc
3758 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3759
3760 /* R_386_IRELATIVE comes last. */
3761 plt_index = htab->next_irelative_index--;
3762 }
3763 else
3764 {
3765 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3766 plt_index = htab->next_jump_slot_index++;
3767 }
3768
3769 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3770 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3771
3772 /* Don't fill the second and third slots in PLT entry for
3773 static executables nor without PLT0. */
3774 if (plt == htab->elf.splt && htab->plt.has_plt0)
3775 {
3776 bfd_put_32 (output_bfd,
3777 plt_index * sizeof (Elf32_External_Rel),
3778 plt->contents + h->plt.offset
3779 + htab->lazy_plt->plt_reloc_offset);
3780 bfd_put_32 (output_bfd,
3781 - (h->plt.offset
3782 + htab->lazy_plt->plt_plt_offset + 4),
3783 (plt->contents + h->plt.offset
3784 + htab->lazy_plt->plt_plt_offset));
3785 }
3786 }
3787 }
3788 else if (eh->plt_got.offset != (bfd_vma) -1)
3789 {
3790 bfd_vma got_offset, plt_offset;
3791 asection *plt, *got, *gotplt;
3792 const bfd_byte *got_plt_entry;
3793
3794 /* Set the entry in the GOT procedure linkage table. */
3795 plt = htab->plt_got;
3796 got = htab->elf.sgot;
3797 gotplt = htab->elf.sgotplt;
3798 got_offset = h->got.offset;
3799
3800 if (got_offset == (bfd_vma) -1
3801 || plt == NULL
3802 || got == NULL
3803 || gotplt == NULL)
3804 abort ();
3805
3806 /* Fill in the entry in the GOT procedure linkage table. */
3807 if (! bfd_link_pic (info))
3808 {
3809 got_plt_entry = htab->non_lazy_plt->plt_entry;
3810 got_offset += got->output_section->vma + got->output_offset;
3811 }
3812 else
3813 {
3814 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3815 got_offset += (got->output_section->vma
3816 + got->output_offset
3817 - gotplt->output_section->vma
3818 - gotplt->output_offset);
3819 }
3820
3821 plt_offset = eh->plt_got.offset;
3822 memcpy (plt->contents + plt_offset, got_plt_entry,
3823 htab->non_lazy_plt->plt_entry_size);
3824 bfd_put_32 (output_bfd, got_offset,
3825 (plt->contents + plt_offset
3826 + htab->non_lazy_plt->plt_got_offset));
3827 }
3828
3829 if (!local_undefweak
3830 && !h->def_regular
3831 && (h->plt.offset != (bfd_vma) -1
3832 || eh->plt_got.offset != (bfd_vma) -1))
3833 {
3834 /* Mark the symbol as undefined, rather than as defined in
3835 the .plt section. Leave the value if there were any
3836 relocations where pointer equality matters (this is a clue
3837 for the dynamic linker, to make function pointer
3838 comparisons work between an application and shared
3839 library), otherwise set it to zero. If a function is only
3840 called from a binary, there is no need to slow down
3841 shared libraries because of that. */
3842 sym->st_shndx = SHN_UNDEF;
3843 if (!h->pointer_equality_needed)
3844 sym->st_value = 0;
3845 }
3846
3847 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3848
3849 /* Don't generate dynamic GOT relocation against undefined weak
3850 symbol in executable. */
3851 if (h->got.offset != (bfd_vma) -1
3852 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3853 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3854 && !local_undefweak)
3855 {
3856 Elf_Internal_Rela rel;
3857 asection *relgot = htab->elf.srelgot;
3858 const char *relative_reloc_name = NULL;
3859 bool generate_dynamic_reloc = true;
3860
3861 /* This symbol has an entry in the global offset table. Set it
3862 up. */
3863
3864 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3865 abort ();
3866
3867 rel.r_offset = (htab->elf.sgot->output_section->vma
3868 + htab->elf.sgot->output_offset
3869 + (h->got.offset & ~(bfd_vma) 1));
3870
3871 /* If this is a static link, or it is a -Bsymbolic link and the
3872 symbol is defined locally or was forced to be local because
3873 of a version file, we just want to emit a RELATIVE reloc.
3874 The entry in the global offset table will already have been
3875 initialized in the relocate_section function. */
3876 if (h->def_regular
3877 && h->type == STT_GNU_IFUNC)
3878 {
3879 if (h->plt.offset == (bfd_vma) -1)
3880 {
3881 /* STT_GNU_IFUNC is referenced without PLT. */
3882 if (htab->elf.splt == NULL)
3883 {
3884 /* use .rel[a].iplt section to store .got relocations
3885 in static executable. */
3886 relgot = htab->elf.irelplt;
3887 }
3888 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3889 {
3890 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3891 h->root.root.string,
3892 h->root.u.def.section->owner);
3893
3894 bfd_put_32 (output_bfd,
3895 (h->root.u.def.value
3896 + h->root.u.def.section->output_section->vma
3897 + h->root.u.def.section->output_offset),
3898 htab->elf.sgot->contents + h->got.offset);
3899 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3900 relative_reloc_name = "R_386_IRELATIVE";
3901 }
3902 else
3903 goto do_glob_dat;
3904 }
3905 else if (bfd_link_pic (info))
3906 {
3907 /* Generate R_386_GLOB_DAT. */
3908 goto do_glob_dat;
3909 }
3910 else
3911 {
3912 asection *plt;
3913 bfd_vma plt_offset;
3914
3915 if (!h->pointer_equality_needed)
3916 abort ();
3917
3918 /* For non-shared object, we can't use .got.plt, which
3919 contains the real function addres if we need pointer
3920 equality. We load the GOT entry with the PLT entry. */
3921 if (htab->plt_second != NULL)
3922 {
3923 plt = htab->plt_second;
3924 plt_offset = eh->plt_second.offset;
3925 }
3926 else
3927 {
3928 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3929 plt_offset = h->plt.offset;
3930 }
3931 bfd_put_32 (output_bfd,
3932 (plt->output_section->vma
3933 + plt->output_offset + plt_offset),
3934 htab->elf.sgot->contents + h->got.offset);
3935 return true;
3936 }
3937 }
3938 else if (bfd_link_pic (info)
3939 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3940 {
3941 BFD_ASSERT((h->got.offset & 1) != 0);
3942 if (info->enable_dt_relr)
3943 generate_dynamic_reloc = false;
3944 else
3945 {
3946 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3947 relative_reloc_name = "R_386_RELATIVE";
3948 }
3949 }
3950 else
3951 {
3952 BFD_ASSERT((h->got.offset & 1) == 0);
3953 do_glob_dat:
3954 bfd_put_32 (output_bfd, (bfd_vma) 0,
3955 htab->elf.sgot->contents + h->got.offset);
3956 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3957 }
3958
3959 if (generate_dynamic_reloc)
3960 {
3961 if (relative_reloc_name != NULL
3962 && htab->params->report_relative_reloc)
3963 _bfd_x86_elf_link_report_relative_reloc
3964 (info, relgot, h, sym, relative_reloc_name, &rel);
3965
3966 elf_append_rel (output_bfd, relgot, &rel);
3967 }
3968 }
3969
3970 if (h->needs_copy)
3971 {
3972 Elf_Internal_Rela rel;
3973 asection *s;
3974
3975 /* This symbol needs a copy reloc. Set it up. */
3976 VERIFY_COPY_RELOC (h, htab)
3977
3978 rel.r_offset = (h->root.u.def.value
3979 + h->root.u.def.section->output_section->vma
3980 + h->root.u.def.section->output_offset);
3981 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3982 if (h->root.u.def.section == htab->elf.sdynrelro)
3983 s = htab->elf.sreldynrelro;
3984 else
3985 s = htab->elf.srelbss;
3986 elf_append_rel (output_bfd, s, &rel);
3987 }
3988
3989 return true;
3990 }
3991
3992 /* Finish up local dynamic symbol handling. We set the contents of
3993 various dynamic sections here. */
3994
3995 static int
3996 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3997 {
3998 struct elf_link_hash_entry *h
3999 = (struct elf_link_hash_entry *) *slot;
4000 struct bfd_link_info *info
4001 = (struct bfd_link_info *) inf;
4002
4003 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4004 h, NULL);
4005 }
4006
4007 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4008 here since undefined weak symbol may not be dynamic and may not be
4009 called for elf_i386_finish_dynamic_symbol. */
4010
4011 static bool
4012 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4013 void *inf)
4014 {
4015 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4016 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4017
4018 if (h->root.type != bfd_link_hash_undefweak
4019 || h->dynindx != -1)
4020 return true;
4021
4022 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4023 info, h, NULL);
4024 }
4025
4026 /* Used to decide how to sort relocs in an optimal manner for the
4027 dynamic linker, before writing them out. */
4028
4029 static enum elf_reloc_type_class
4030 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4031 const asection *rel_sec ATTRIBUTE_UNUSED,
4032 const Elf_Internal_Rela *rela)
4033 {
4034 bfd *abfd = info->output_bfd;
4035 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4036 struct elf_link_hash_table *htab = elf_hash_table (info);
4037
4038 if (htab->dynsym != NULL
4039 && htab->dynsym->contents != NULL)
4040 {
4041 /* Check relocation against STT_GNU_IFUNC symbol if there are
4042 dynamic symbols. */
4043 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4044 if (r_symndx != STN_UNDEF)
4045 {
4046 Elf_Internal_Sym sym;
4047 if (!bed->s->swap_symbol_in (abfd,
4048 (htab->dynsym->contents
4049 + r_symndx * sizeof (Elf32_External_Sym)),
4050 0, &sym))
4051 abort ();
4052
4053 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4054 return reloc_class_ifunc;
4055 }
4056 }
4057
4058 switch (ELF32_R_TYPE (rela->r_info))
4059 {
4060 case R_386_IRELATIVE:
4061 return reloc_class_ifunc;
4062 case R_386_RELATIVE:
4063 return reloc_class_relative;
4064 case R_386_JUMP_SLOT:
4065 return reloc_class_plt;
4066 case R_386_COPY:
4067 return reloc_class_copy;
4068 default:
4069 return reloc_class_normal;
4070 }
4071 }
4072
4073 /* Finish up the dynamic sections. */
4074
4075 static bool
4076 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4077 struct bfd_link_info *info)
4078 {
4079 struct elf_x86_link_hash_table *htab;
4080
4081 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4082 if (htab == NULL)
4083 return false;
4084
4085 if (!htab->elf.dynamic_sections_created)
4086 return true;
4087
4088 if (htab->elf.splt && htab->elf.splt->size > 0)
4089 {
4090 if (bfd_is_abs_section (htab->elf.splt->output_section))
4091 {
4092 info->callbacks->einfo
4093 (_("%F%P: discarded output section: `%pA'\n"),
4094 htab->elf.splt);
4095 return false;
4096 }
4097
4098 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4099 really seem like the right value. */
4100 elf_section_data (htab->elf.splt->output_section)
4101 ->this_hdr.sh_entsize = 4;
4102
4103 if (htab->plt.has_plt0)
4104 {
4105 /* Fill in the special first entry in the procedure linkage
4106 table. */
4107 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4108 htab->lazy_plt->plt0_entry_size);
4109 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4110 htab->plt0_pad_byte,
4111 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4112 if (!bfd_link_pic (info))
4113 {
4114 bfd_put_32 (output_bfd,
4115 (htab->elf.sgotplt->output_section->vma
4116 + htab->elf.sgotplt->output_offset
4117 + 4),
4118 htab->elf.splt->contents
4119 + htab->lazy_plt->plt0_got1_offset);
4120 bfd_put_32 (output_bfd,
4121 (htab->elf.sgotplt->output_section->vma
4122 + htab->elf.sgotplt->output_offset
4123 + 8),
4124 htab->elf.splt->contents
4125 + htab->lazy_plt->plt0_got2_offset);
4126
4127 if (htab->elf.target_os == is_vxworks)
4128 {
4129 Elf_Internal_Rela rel;
4130 int num_plts = (htab->elf.splt->size
4131 / htab->plt.plt_entry_size) - 1;
4132 unsigned char *p;
4133 asection *srelplt2 = htab->srelplt2;
4134
4135 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4136 + 4. On IA32 we use REL relocations so the
4137 addend goes in the PLT directly. */
4138 rel.r_offset = (htab->elf.splt->output_section->vma
4139 + htab->elf.splt->output_offset
4140 + htab->lazy_plt->plt0_got1_offset);
4141 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4142 R_386_32);
4143 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4144 srelplt2->contents);
4145 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4146 + 8. */
4147 rel.r_offset = (htab->elf.splt->output_section->vma
4148 + htab->elf.splt->output_offset
4149 + htab->lazy_plt->plt0_got2_offset);
4150 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4151 R_386_32);
4152 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4153 srelplt2->contents +
4154 sizeof (Elf32_External_Rel));
4155 /* Correct the .rel.plt.unloaded relocations. */
4156 p = srelplt2->contents;
4157 if (bfd_link_pic (info))
4158 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4159 else
4160 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4161
4162 for (; num_plts; num_plts--)
4163 {
4164 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4165 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4166 R_386_32);
4167 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4168 p += sizeof (Elf32_External_Rel);
4169
4170 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4171 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4172 R_386_32);
4173 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4174 p += sizeof (Elf32_External_Rel);
4175 }
4176 }
4177 }
4178 }
4179 }
4180
4181 /* Fill PLT entries for undefined weak symbols in PIE. */
4182 if (bfd_link_pie (info))
4183 bfd_hash_traverse (&info->hash->table,
4184 elf_i386_pie_finish_undefweak_symbol,
4185 info);
4186
4187 return true;
4188 }
4189
4190 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4191 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4192 It has to be done before elf_link_sort_relocs is called so that
4193 dynamic relocations are properly sorted. */
4194
4195 static bool
4196 elf_i386_output_arch_local_syms
4197 (bfd *output_bfd ATTRIBUTE_UNUSED,
4198 struct bfd_link_info *info,
4199 void *flaginfo ATTRIBUTE_UNUSED,
4200 int (*func) (void *, const char *,
4201 Elf_Internal_Sym *,
4202 asection *,
4203 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4204 {
4205 struct elf_x86_link_hash_table *htab
4206 = elf_x86_hash_table (info, I386_ELF_DATA);
4207 if (htab == NULL)
4208 return false;
4209
4210 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4211 htab_traverse (htab->loc_hash_table,
4212 elf_i386_finish_local_dynamic_symbol,
4213 info);
4214
4215 return true;
4216 }
4217
4218 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4219 dynamic relocations. */
4220
4221 static long
4222 elf_i386_get_synthetic_symtab (bfd *abfd,
4223 long symcount ATTRIBUTE_UNUSED,
4224 asymbol **syms ATTRIBUTE_UNUSED,
4225 long dynsymcount,
4226 asymbol **dynsyms,
4227 asymbol **ret)
4228 {
4229 long count, i, n;
4230 int j;
4231 bfd_byte *plt_contents;
4232 long relsize;
4233 const struct elf_x86_lazy_plt_layout *lazy_plt;
4234 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4235 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4236 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4237 asection *plt;
4238 bfd_vma got_addr;
4239 enum elf_x86_plt_type plt_type;
4240 struct elf_x86_plt plts[] =
4241 {
4242 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4243 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4244 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4245 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4246 };
4247
4248 *ret = NULL;
4249
4250 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4251 return 0;
4252
4253 if (dynsymcount <= 0)
4254 return 0;
4255
4256 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4257 if (relsize <= 0)
4258 return -1;
4259
4260 non_lazy_plt = NULL;
4261 /* Silence GCC 6. */
4262 lazy_plt = NULL;
4263 non_lazy_ibt_plt = NULL;
4264 lazy_ibt_plt = NULL;
4265 switch (get_elf_backend_data (abfd)->target_os)
4266 {
4267 case is_normal:
4268 case is_solaris:
4269 non_lazy_plt = &elf_i386_non_lazy_plt;
4270 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4271 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4272 /* Fall through */
4273 case is_vxworks:
4274 lazy_plt = &elf_i386_lazy_plt;
4275 break;
4276 default:
4277 abort ();
4278 }
4279
4280 got_addr = 0;
4281
4282 count = 0;
4283 for (j = 0; plts[j].name != NULL; j++)
4284 {
4285 plt = bfd_get_section_by_name (abfd, plts[j].name);
4286 if (plt == NULL || plt->size == 0)
4287 continue;
4288
4289 /* Get the PLT section contents. */
4290 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4291 if (plt_contents == NULL)
4292 break;
4293 if (!bfd_get_section_contents (abfd, (asection *) plt,
4294 plt_contents, 0, plt->size))
4295 {
4296 free (plt_contents);
4297 break;
4298 }
4299
4300 /* Check what kind of PLT it is. */
4301 plt_type = plt_unknown;
4302 if (plts[j].type == plt_unknown
4303 && (plt->size >= (lazy_plt->plt0_entry_size
4304 + lazy_plt->plt_entry_size)))
4305 {
4306 /* Match lazy PLT first. */
4307 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4308 lazy_plt->plt0_got1_offset) == 0)
4309 {
4310 /* The fist entry in the lazy IBT PLT is the same as the
4311 normal lazy PLT. */
4312 if (lazy_ibt_plt != NULL
4313 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4314 lazy_ibt_plt->plt_entry,
4315 lazy_ibt_plt->plt_got_offset) == 0))
4316 plt_type = plt_lazy | plt_second;
4317 else
4318 plt_type = plt_lazy;
4319 }
4320 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4321 lazy_plt->plt0_got1_offset) == 0)
4322 {
4323 /* The fist entry in the PIC lazy IBT PLT is the same as
4324 the normal PIC lazy PLT. */
4325 if (lazy_ibt_plt != NULL
4326 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4327 lazy_ibt_plt->pic_plt_entry,
4328 lazy_ibt_plt->plt_got_offset) == 0))
4329 plt_type = plt_lazy | plt_pic | plt_second;
4330 else
4331 plt_type = plt_lazy | plt_pic;
4332 }
4333 }
4334
4335 if (non_lazy_plt != NULL
4336 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4337 && plt->size >= non_lazy_plt->plt_entry_size)
4338 {
4339 /* Match non-lazy PLT. */
4340 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4341 non_lazy_plt->plt_got_offset) == 0)
4342 plt_type = plt_non_lazy;
4343 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4344 non_lazy_plt->plt_got_offset) == 0)
4345 plt_type = plt_pic;
4346 }
4347
4348 if ((non_lazy_ibt_plt != NULL)
4349 && (plt_type == plt_unknown || plt_type == plt_second)
4350 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4351 {
4352 if (memcmp (plt_contents,
4353 non_lazy_ibt_plt->plt_entry,
4354 non_lazy_ibt_plt->plt_got_offset) == 0)
4355 {
4356 /* Match IBT PLT. */
4357 plt_type = plt_second;
4358 non_lazy_plt = non_lazy_ibt_plt;
4359 }
4360 else if (memcmp (plt_contents,
4361 non_lazy_ibt_plt->pic_plt_entry,
4362 non_lazy_ibt_plt->plt_got_offset) == 0)
4363 {
4364 /* Match PIC IBT PLT. */
4365 plt_type = plt_second | plt_pic;
4366 non_lazy_plt = non_lazy_ibt_plt;
4367 }
4368 }
4369
4370 if (plt_type == plt_unknown)
4371 {
4372 free (plt_contents);
4373 continue;
4374 }
4375
4376 plts[j].sec = plt;
4377 plts[j].type = plt_type;
4378
4379 if ((plt_type & plt_lazy))
4380 {
4381 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4382 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4383 /* Skip PLT0 in lazy PLT. */
4384 i = 1;
4385 }
4386 else
4387 {
4388 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4389 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4390 i = 0;
4391 }
4392
4393 /* Skip lazy PLT when the second PLT is used. */
4394 if ((plt_type & (plt_lazy | plt_second))
4395 == (plt_lazy | plt_second))
4396 plts[j].count = 0;
4397 else
4398 {
4399 n = plt->size / plts[j].plt_entry_size;
4400 plts[j].count = n;
4401 count += n - i;
4402 }
4403
4404 plts[j].contents = plt_contents;
4405
4406 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4407 if ((plt_type & plt_pic))
4408 got_addr = (bfd_vma) -1;
4409 }
4410
4411 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4412 got_addr, plts, dynsyms,
4413 ret);
4414 }
4415
4416 /* Set up i386 GNU properties. Return the first relocatable ELF input
4417 with GNU properties if found. Otherwise, return NULL. */
4418
4419 static bfd *
4420 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4421 {
4422 struct elf_x86_init_table init_table;
4423
4424 switch (get_elf_backend_data (info->output_bfd)->target_os)
4425 {
4426 case is_normal:
4427 case is_solaris:
4428 init_table.plt0_pad_byte = 0x0;
4429 init_table.lazy_plt = &elf_i386_lazy_plt;
4430 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4431 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4432 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4433 break;
4434 case is_vxworks:
4435 init_table.plt0_pad_byte = 0x90;
4436 init_table.lazy_plt = &elf_i386_lazy_plt;
4437 init_table.non_lazy_plt = NULL;
4438 init_table.lazy_ibt_plt = NULL;
4439 init_table.non_lazy_ibt_plt = NULL;
4440 break;
4441 default:
4442 abort ();
4443 }
4444
4445 init_table.r_info = elf32_r_info;
4446 init_table.r_sym = elf32_r_sym;
4447
4448 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4449 }
4450
4451 #define TARGET_LITTLE_SYM i386_elf32_vec
4452 #define TARGET_LITTLE_NAME "elf32-i386"
4453 #define ELF_ARCH bfd_arch_i386
4454 #define ELF_TARGET_ID I386_ELF_DATA
4455 #define ELF_MACHINE_CODE EM_386
4456 #define ELF_MAXPAGESIZE 0x1000
4457
4458 #define elf_backend_can_gc_sections 1
4459 #define elf_backend_can_refcount 1
4460 #define elf_backend_want_got_plt 1
4461 #define elf_backend_plt_readonly 1
4462 #define elf_backend_want_plt_sym 0
4463 #define elf_backend_got_header_size 12
4464 #define elf_backend_plt_alignment 4
4465 #define elf_backend_dtrel_excludes_plt 1
4466 #define elf_backend_caches_rawsize 1
4467 #define elf_backend_want_dynrelro 1
4468
4469 /* Support RELA for objdump of prelink objects. */
4470 #define elf_info_to_howto elf_i386_info_to_howto_rel
4471 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4472
4473 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4474 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4475 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4476 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4477
4478 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4479 #define elf_backend_early_size_sections elf_i386_early_size_sections
4480 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4481 #define elf_backend_fake_sections elf_i386_fake_sections
4482 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4483 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4484 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4485 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4486 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4487 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4488 #define elf_backend_relocate_section elf_i386_relocate_section
4489 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4490 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4491
4492 #define elf_backend_linux_prpsinfo32_ugid16 true
4493
4494 #define elf32_bed elf32_i386_bed
4495
4496 #include "elf32-target.h"
4497
4498 /* FreeBSD support. */
4499
4500 #undef TARGET_LITTLE_SYM
4501 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4502 #undef TARGET_LITTLE_NAME
4503 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4504 #undef ELF_OSABI
4505 #define ELF_OSABI ELFOSABI_FREEBSD
4506
4507 /* The kernel recognizes executables as valid only if they carry a
4508 "FreeBSD" label in the ELF header. So we put this label on all
4509 executables and (for simplicity) also all other object files. */
4510
4511 static bool
4512 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4513 {
4514 if (!_bfd_elf_init_file_header (abfd, info))
4515 return false;
4516
4517 #ifdef OLD_FREEBSD_ABI_LABEL
4518 {
4519 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4520 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4521 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4522 }
4523 #endif
4524 return true;
4525 }
4526
4527 #undef elf_backend_init_file_header
4528 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4529 #undef elf32_bed
4530 #define elf32_bed elf32_i386_fbsd_bed
4531
4532 #undef elf_backend_add_symbol_hook
4533
4534 #include "elf32-target.h"
4535
4536 #undef elf_backend_init_file_header
4537
4538 /* Solaris 2. */
4539
4540 #undef TARGET_LITTLE_SYM
4541 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4542 #undef TARGET_LITTLE_NAME
4543 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4544
4545 #undef ELF_TARGET_OS
4546 #define ELF_TARGET_OS is_solaris
4547
4548 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4549 objects won't be recognized. */
4550 #undef ELF_OSABI
4551
4552 #undef elf32_bed
4553 #define elf32_bed elf32_i386_sol2_bed
4554
4555 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4556 boundary. */
4557 #undef elf_backend_static_tls_alignment
4558 #define elf_backend_static_tls_alignment 8
4559
4560 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4561
4562 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4563 File, p.63. */
4564 #undef elf_backend_want_plt_sym
4565 #define elf_backend_want_plt_sym 1
4566
4567 #undef elf_backend_strtab_flags
4568 #define elf_backend_strtab_flags SHF_STRINGS
4569
4570 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4571 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4572 FALSE otherwise. ISECTION is the best guess matching section from the
4573 input bfd IBFD, but it might be NULL. */
4574
4575 static bool
4576 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4577 bfd *obfd ATTRIBUTE_UNUSED,
4578 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4579 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4580 {
4581 /* PR 19938: FIXME: Need to add code for setting the sh_info
4582 and sh_link fields of Solaris specific section types. */
4583 return false;
4584
4585 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4586 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4587
4588 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4589
4590 The following values should be set:
4591
4592 Type Link Info
4593 -----------------------------------------------------------------------------
4594 SHT_SUNW_ancillary The section header index of 0
4595 [0x6fffffee] the associated string table.
4596
4597 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4598 [0x6ffffff0] the associated symbol table. section header index of
4599 the associated
4600 SHT_SUNW_capchain table,
4601 otherwise 0.
4602
4603 SHT_SUNW_symsort The section header index of 0
4604 [0x6ffffff1] the associated symbol table.
4605
4606 SHT_SUNW_tlssort The section header index of 0
4607 [0x6ffffff2] the associated symbol table.
4608
4609 SHT_SUNW_LDYNSYM The section header index of One greater than the
4610 [0x6ffffff3] the associated string table. symbol table index of the
4611 This index is the same string last local symbol,
4612 table used by the SHT_DYNSYM STB_LOCAL. Since
4613 section. SHT_SUNW_LDYNSYM only
4614 contains local symbols,
4615 sh_info is equivalent to
4616 the number of symbols in
4617 the table.
4618
4619 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4620 [0x6ffffff5] the section header index of to named strings, the
4621 the associated section header index of
4622 SHT_SUNW_capinfo table, the associated string
4623 otherwise 0. table, otherwise 0.
4624
4625 SHT_SUNW_move The section header index of 0
4626 [0x6ffffffa] the associated symbol table.
4627
4628 SHT_SUNW_COMDAT 0 0
4629 [0x6ffffffb]
4630
4631 SHT_SUNW_syminfo The section header index of The section header index
4632 [0x6ffffffc] the associated symbol table. of the associated
4633 .dynamic section.
4634
4635 SHT_SUNW_verdef The section header index of The number of version
4636 [0x6ffffffd] the associated string table. definitions within the
4637 section.
4638
4639 SHT_SUNW_verneed The section header index of The number of version
4640 [0x6ffffffe] the associated string table. dependencies within the
4641 section.
4642
4643 SHT_SUNW_versym The section header index of 0
4644 [0x6fffffff] the associated symbol table. */
4645 }
4646
4647 #undef elf_backend_copy_special_section_fields
4648 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4649
4650 #include "elf32-target.h"
4651
4652 /* Intel MCU support. */
4653
4654 static bool
4655 elf32_iamcu_elf_object_p (bfd *abfd)
4656 {
4657 /* Set the right machine number for an IAMCU elf32 file. */
4658 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4659 return true;
4660 }
4661
4662 #undef TARGET_LITTLE_SYM
4663 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4664 #undef TARGET_LITTLE_NAME
4665 #define TARGET_LITTLE_NAME "elf32-iamcu"
4666 #undef ELF_ARCH
4667 #define ELF_ARCH bfd_arch_iamcu
4668
4669 #undef ELF_MACHINE_CODE
4670 #define ELF_MACHINE_CODE EM_IAMCU
4671
4672 #undef ELF_TARGET_OS
4673 #undef ELF_OSABI
4674
4675 #undef elf32_bed
4676 #define elf32_bed elf32_iamcu_bed
4677
4678 #undef elf_backend_object_p
4679 #define elf_backend_object_p elf32_iamcu_elf_object_p
4680
4681 #undef elf_backend_static_tls_alignment
4682
4683 #undef elf_backend_want_plt_sym
4684 #define elf_backend_want_plt_sym 0
4685
4686 #undef elf_backend_strtab_flags
4687 #undef elf_backend_copy_special_section_fields
4688
4689 #include "elf32-target.h"
4690
4691 /* Restore defaults. */
4692 #undef ELF_ARCH
4693 #define ELF_ARCH bfd_arch_i386
4694 #undef ELF_MACHINE_CODE
4695 #define ELF_MACHINE_CODE EM_386
4696 #undef elf_backend_object_p
4697
4698 /* VxWorks support. */
4699
4700 #undef TARGET_LITTLE_SYM
4701 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4702 #undef TARGET_LITTLE_NAME
4703 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4704 #undef ELF_OSABI
4705 #undef ELF_MAXPAGESIZE
4706 #define ELF_MAXPAGESIZE 0x1000
4707 #undef elf_backend_plt_alignment
4708 #define elf_backend_plt_alignment 4
4709
4710 #undef ELF_TARGET_OS
4711 #define ELF_TARGET_OS is_vxworks
4712
4713 #undef elf_backend_relocs_compatible
4714 #undef elf_backend_add_symbol_hook
4715 #define elf_backend_add_symbol_hook \
4716 elf_vxworks_add_symbol_hook
4717 #undef elf_backend_link_output_symbol_hook
4718 #define elf_backend_link_output_symbol_hook \
4719 elf_vxworks_link_output_symbol_hook
4720 #undef elf_backend_emit_relocs
4721 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4722 #undef elf_backend_final_write_processing
4723 #define elf_backend_final_write_processing \
4724 elf_vxworks_final_write_processing
4725 #undef elf_backend_static_tls_alignment
4726
4727 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4728 define it. */
4729 #undef elf_backend_want_plt_sym
4730 #define elf_backend_want_plt_sym 1
4731
4732 #undef elf32_bed
4733 #define elf32_bed elf32_i386_vxworks_bed
4734
4735 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.