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Fix whitespace snafu in tc-riscv.c
[binutils-gdb.git] / bfd / elf32-i386.c
blobabfba406a81d117ea0fba687d224a732d6597f9b
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2023 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "elfxx-x86.h"
22 #include "elf-vxworks.h"
23 #include "dwarf2.h"
24 #include "opcode/i386.h"
25
26 /* 386 uses REL relocations instead of RELA. */
27 #define USE_REL 1
28
29 static reloc_howto_type elf_howto_table[]=
30 {
31 HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
32 bfd_elf_generic_reloc, "R_386_NONE",
33 true, 0x00000000, 0x00000000, false),
34 HOWTO(R_386_32, 0, 4, 32, false, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_32",
36 true, 0xffffffff, 0xffffffff, false),
37 HOWTO(R_386_PC32, 0, 4, 32, true, 0, complain_overflow_dont,
38 bfd_elf_generic_reloc, "R_386_PC32",
39 true, 0xffffffff, 0xffffffff, true),
40 HOWTO(R_386_GOT32, 0, 4, 32, false, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_GOT32",
42 true, 0xffffffff, 0xffffffff, false),
43 HOWTO(R_386_PLT32, 0, 4, 32, true, 0, complain_overflow_dont,
44 bfd_elf_generic_reloc, "R_386_PLT32",
45 true, 0xffffffff, 0xffffffff, true),
46 HOWTO(R_386_COPY, 0, 4, 32, false, 0, complain_overflow_dont,
47 bfd_elf_generic_reloc, "R_386_COPY",
48 true, 0xffffffff, 0xffffffff, false),
49 HOWTO(R_386_GLOB_DAT, 0, 4, 32, false, 0, complain_overflow_dont,
50 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
51 true, 0xffffffff, 0xffffffff, false),
52 HOWTO(R_386_JUMP_SLOT, 0, 4, 32, false, 0, complain_overflow_dont,
53 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
54 true, 0xffffffff, 0xffffffff, false),
55 HOWTO(R_386_RELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
56 bfd_elf_generic_reloc, "R_386_RELATIVE",
57 true, 0xffffffff, 0xffffffff, false),
58 HOWTO(R_386_GOTOFF, 0, 4, 32, false, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_386_GOTOFF",
60 true, 0xffffffff, 0xffffffff, false),
61 HOWTO(R_386_GOTPC, 0, 4, 32, true, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_386_GOTPC",
63 true, 0xffffffff, 0xffffffff, true),
64
65 /* We have a gap in the reloc numbers here.
66 R_386_standard counts the number up to this point, and
67 R_386_ext_offset is the value to subtract from a reloc type of
68 R_386_16 thru R_386_PC8 to form an index into this table. */
69 #define R_386_standard (R_386_GOTPC + 1)
70 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
71
72 /* These relocs are a GNU extension. */
73 HOWTO(R_386_TLS_TPOFF, 0, 4, 32, false, 0, complain_overflow_dont,
74 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
75 true, 0xffffffff, 0xffffffff, false),
76 HOWTO(R_386_TLS_IE, 0, 4, 32, false, 0, complain_overflow_dont,
77 bfd_elf_generic_reloc, "R_386_TLS_IE",
78 true, 0xffffffff, 0xffffffff, false),
79 HOWTO(R_386_TLS_GOTIE, 0, 4, 32, false, 0, complain_overflow_dont,
80 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
81 true, 0xffffffff, 0xffffffff, false),
82 HOWTO(R_386_TLS_LE, 0, 4, 32, false, 0, complain_overflow_dont,
83 bfd_elf_generic_reloc, "R_386_TLS_LE",
84 true, 0xffffffff, 0xffffffff, false),
85 HOWTO(R_386_TLS_GD, 0, 4, 32, false, 0, complain_overflow_dont,
86 bfd_elf_generic_reloc, "R_386_TLS_GD",
87 true, 0xffffffff, 0xffffffff, false),
88 HOWTO(R_386_TLS_LDM, 0, 4, 32, false, 0, complain_overflow_dont,
89 bfd_elf_generic_reloc, "R_386_TLS_LDM",
90 true, 0xffffffff, 0xffffffff, false),
91 HOWTO(R_386_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_16",
93 true, 0xffff, 0xffff, false),
94 HOWTO(R_386_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_PC16",
96 true, 0xffff, 0xffff, true),
97 HOWTO(R_386_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_8",
99 true, 0xff, 0xff, false),
100 HOWTO(R_386_PC8, 0, 1, 8, true, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_386_PC8",
102 true, 0xff, 0xff, true),
103
104 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
105 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
106 /* These are common with Solaris TLS implementation. */
107 HOWTO(R_386_TLS_LDO_32, 0, 4, 32, false, 0, complain_overflow_dont,
108 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
109 true, 0xffffffff, 0xffffffff, false),
110 HOWTO(R_386_TLS_IE_32, 0, 4, 32, false, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
112 true, 0xffffffff, 0xffffffff, false),
113 HOWTO(R_386_TLS_LE_32, 0, 4, 32, false, 0, complain_overflow_dont,
114 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
115 true, 0xffffffff, 0xffffffff, false),
116 HOWTO(R_386_TLS_DTPMOD32, 0, 4, 32, false, 0, complain_overflow_dont,
117 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
118 true, 0xffffffff, 0xffffffff, false),
119 HOWTO(R_386_TLS_DTPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
121 true, 0xffffffff, 0xffffffff, false),
122 HOWTO(R_386_TLS_TPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
123 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
124 true, 0xffffffff, 0xffffffff, false),
125 HOWTO(R_386_SIZE32, 0, 4, 32, false, 0, complain_overflow_dont,
126 bfd_elf_generic_reloc, "R_386_SIZE32",
127 true, 0xffffffff, 0xffffffff, false),
128 HOWTO(R_386_TLS_GOTDESC, 0, 4, 32, false, 0, complain_overflow_dont,
129 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
130 true, 0xffffffff, 0xffffffff, false),
131 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, false, 0, complain_overflow_dont,
132 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
133 false, 0, 0, false),
134 HOWTO(R_386_TLS_DESC, 0, 4, 32, false, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC",
136 true, 0xffffffff, 0xffffffff, false),
137 HOWTO(R_386_IRELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_IRELATIVE",
139 true, 0xffffffff, 0xffffffff, false),
140 HOWTO(R_386_GOT32X, 0, 4, 32, false, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_GOT32X",
142 true, 0xffffffff, 0xffffffff, false),
143
144 /* Another gap. */
145 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
146 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
147
148 /* GNU extension to record C++ vtable hierarchy. */
149 HOWTO (R_386_GNU_VTINHERIT, /* type */
150 0, /* rightshift */
151 4, /* size */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 NULL, /* special_function */
157 "R_386_GNU_VTINHERIT", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 false), /* pcrel_offset */
162
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_386_GNU_VTENTRY, /* type */
165 0, /* rightshift */
166 4, /* size */
167 0, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_dont, /* complain_on_overflow */
171 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
172 "R_386_GNU_VTENTRY", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0, /* dst_mask */
176 false) /* pcrel_offset */
177
178 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
179
180 };
181
182 #ifdef DEBUG_GEN_RELOC
183 #define TRACE(str) \
184 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
185 #else
186 #define TRACE(str)
187 #endif
188
189 static reloc_howto_type *
190 elf_i386_reloc_type_lookup (bfd *abfd,
191 bfd_reloc_code_real_type code)
192 {
193 switch (code)
194 {
195 case BFD_RELOC_NONE:
196 TRACE ("BFD_RELOC_NONE");
197 return &elf_howto_table[R_386_NONE];
198
199 case BFD_RELOC_32:
200 TRACE ("BFD_RELOC_32");
201 return &elf_howto_table[R_386_32];
202
203 case BFD_RELOC_CTOR:
204 TRACE ("BFD_RELOC_CTOR");
205 return &elf_howto_table[R_386_32];
206
207 case BFD_RELOC_32_PCREL:
208 TRACE ("BFD_RELOC_PC32");
209 return &elf_howto_table[R_386_PC32];
210
211 case BFD_RELOC_386_GOT32:
212 TRACE ("BFD_RELOC_386_GOT32");
213 return &elf_howto_table[R_386_GOT32];
214
215 case BFD_RELOC_386_PLT32:
216 TRACE ("BFD_RELOC_386_PLT32");
217 return &elf_howto_table[R_386_PLT32];
218
219 case BFD_RELOC_386_COPY:
220 TRACE ("BFD_RELOC_386_COPY");
221 return &elf_howto_table[R_386_COPY];
222
223 case BFD_RELOC_386_GLOB_DAT:
224 TRACE ("BFD_RELOC_386_GLOB_DAT");
225 return &elf_howto_table[R_386_GLOB_DAT];
226
227 case BFD_RELOC_386_JUMP_SLOT:
228 TRACE ("BFD_RELOC_386_JUMP_SLOT");
229 return &elf_howto_table[R_386_JUMP_SLOT];
230
231 case BFD_RELOC_386_RELATIVE:
232 TRACE ("BFD_RELOC_386_RELATIVE");
233 return &elf_howto_table[R_386_RELATIVE];
234
235 case BFD_RELOC_386_GOTOFF:
236 TRACE ("BFD_RELOC_386_GOTOFF");
237 return &elf_howto_table[R_386_GOTOFF];
238
239 case BFD_RELOC_386_GOTPC:
240 TRACE ("BFD_RELOC_386_GOTPC");
241 return &elf_howto_table[R_386_GOTPC];
242
243 /* These relocs are a GNU extension. */
244 case BFD_RELOC_386_TLS_TPOFF:
245 TRACE ("BFD_RELOC_386_TLS_TPOFF");
246 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
247
248 case BFD_RELOC_386_TLS_IE:
249 TRACE ("BFD_RELOC_386_TLS_IE");
250 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
251
252 case BFD_RELOC_386_TLS_GOTIE:
253 TRACE ("BFD_RELOC_386_TLS_GOTIE");
254 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_LE:
257 TRACE ("BFD_RELOC_386_TLS_LE");
258 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GD:
261 TRACE ("BFD_RELOC_386_TLS_GD");
262 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LDM:
265 TRACE ("BFD_RELOC_386_TLS_LDM");
266 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
267
268 case BFD_RELOC_16:
269 TRACE ("BFD_RELOC_16");
270 return &elf_howto_table[R_386_16 - R_386_ext_offset];
271
272 case BFD_RELOC_16_PCREL:
273 TRACE ("BFD_RELOC_16_PCREL");
274 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
275
276 case BFD_RELOC_8:
277 TRACE ("BFD_RELOC_8");
278 return &elf_howto_table[R_386_8 - R_386_ext_offset];
279
280 case BFD_RELOC_8_PCREL:
281 TRACE ("BFD_RELOC_8_PCREL");
282 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
283
284 /* Common with Sun TLS implementation. */
285 case BFD_RELOC_386_TLS_LDO_32:
286 TRACE ("BFD_RELOC_386_TLS_LDO_32");
287 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
288
289 case BFD_RELOC_386_TLS_IE_32:
290 TRACE ("BFD_RELOC_386_TLS_IE_32");
291 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
292
293 case BFD_RELOC_386_TLS_LE_32:
294 TRACE ("BFD_RELOC_386_TLS_LE_32");
295 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_DTPMOD32:
298 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
299 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_DTPOFF32:
302 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
303 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_TPOFF32:
306 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
307 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
308
309 case BFD_RELOC_SIZE32:
310 TRACE ("BFD_RELOC_SIZE32");
311 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_GOTDESC:
314 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
315 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
316
317 case BFD_RELOC_386_TLS_DESC_CALL:
318 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
319 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_DESC:
322 TRACE ("BFD_RELOC_386_TLS_DESC");
323 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_IRELATIVE:
326 TRACE ("BFD_RELOC_386_IRELATIVE");
327 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
328
329 case BFD_RELOC_386_GOT32X:
330 TRACE ("BFD_RELOC_386_GOT32X");
331 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
332
333 case BFD_RELOC_VTABLE_INHERIT:
334 TRACE ("BFD_RELOC_VTABLE_INHERIT");
335 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
336
337 case BFD_RELOC_VTABLE_ENTRY:
338 TRACE ("BFD_RELOC_VTABLE_ENTRY");
339 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
340
341 default:
342 TRACE ("Unknown");
343 /* xgettext:c-format */
344 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
345 abfd, (int) code);
346 bfd_set_error (bfd_error_bad_value);
347 return NULL;
348 }
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_ext2 - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
376 >= R_386_vt - R_386_ext2))
377 return NULL;
378 /* PR 17512: file: 0f67f69d. */
379 if (elf_howto_table [indx].type != r_type)
380 return NULL;
381 return &elf_howto_table[indx];
382 }
383
384 static bool
385 elf_i386_info_to_howto_rel (bfd *abfd,
386 arelent *cache_ptr,
387 Elf_Internal_Rela *dst)
388 {
389 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
390
391 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
392 {
393 /* xgettext:c-format */
394 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
395 abfd, r_type);
396 bfd_set_error (bfd_error_bad_value);
397 return false;
398 }
399
400 return true;
401 }
402
403 /* Return whether a symbol name implies a local label. The UnixWare
404 2.1 cc generates temporary symbols that start with .X, so we
405 recognize them here. FIXME: do other SVR4 compilers also use .X?.
406 If so, we should move the .X recognition into
407 _bfd_elf_is_local_label_name. */
408
409 static bool
410 elf_i386_is_local_label_name (bfd *abfd, const char *name)
411 {
412 if (name[0] == '.' && name[1] == 'X')
413 return true;
414
415 return _bfd_elf_is_local_label_name (abfd, name);
416 }
417 \f
418 /* Support for core dump NOTE sections. */
419
420 static bool
421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
422 {
423 int offset;
424 size_t size;
425
426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
427 {
428 int pr_version = bfd_get_32 (abfd, note->descdata);
429
430 if (pr_version != 1)
431 return false;
432
433 /* pr_cursig */
434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
435
436 /* pr_pid */
437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
438
439 /* pr_reg */
440 offset = 28;
441 size = bfd_get_32 (abfd, note->descdata + 8);
442 }
443 else
444 {
445 switch (note->descsz)
446 {
447 default:
448 return false;
449
450 case 144: /* Linux/i386 */
451 /* pr_cursig */
452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
453
454 /* pr_pid */
455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
456
457 /* pr_reg */
458 offset = 72;
459 size = 68;
460
461 break;
462 }
463 }
464
465 /* Make a ".reg/999" section. */
466 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
467 size, note->descpos + offset);
468 }
469
470 static bool
471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
472 {
473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
474 {
475 int pr_version = bfd_get_32 (abfd, note->descdata);
476
477 if (pr_version != 1)
478 return false;
479
480 elf_tdata (abfd)->core->program
481 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
482 elf_tdata (abfd)->core->command
483 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
484 }
485 else
486 {
487 switch (note->descsz)
488 {
489 default:
490 return false;
491
492 case 124: /* Linux/i386 elf_prpsinfo. */
493 elf_tdata (abfd)->core->pid
494 = bfd_get_32 (abfd, note->descdata + 12);
495 elf_tdata (abfd)->core->program
496 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
497 elf_tdata (abfd)->core->command
498 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
499 }
500 }
501
502 /* Note that for some reason, a spurious space is tacked
503 onto the end of the args in some (at least one anyway)
504 implementations, so strip it off if it exists. */
505 {
506 char *command = elf_tdata (abfd)->core->command;
507 int n = strlen (command);
508
509 if (0 < n && command[n - 1] == ' ')
510 command[n - 1] = '\0';
511 }
512
513 return true;
514 }
515 \f
516 /* Functions for the i386 ELF linker.
517
518 In order to gain some understanding of code in this file without
519 knowing all the intricate details of the linker, note the
520 following:
521
522 Functions named elf_i386_* are called by external routines, other
523 functions are only called locally. elf_i386_* functions appear
524 in this file more or less in the order in which they are called
525 from external routines. eg. elf_i386_scan_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
528
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
530
531 #define LAZY_PLT_ENTRY_SIZE 16
532
533 /* The size in bytes of an entry in the non-lazy procedure linkage
534 table. */
535
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
537
538 /* The first entry in an absolute lazy procedure linkage table looks
539 like this. See the SVR4 ABI i386 supplement to see how this works.
540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
541
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
543 {
544 0xff, 0x35, /* pushl contents of address */
545 0, 0, 0, 0, /* replaced with address of .got + 4. */
546 0xff, 0x25, /* jmp indirect */
547 0, 0, 0, 0 /* replaced with address of .got + 8. */
548 };
549
550 /* Subsequent entries in an absolute lazy procedure linkage table look
551 like this. */
552
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
557 0x68, /* pushl immediate */
558 0, 0, 0, 0, /* replaced with offset into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt. */
561 };
562
563 /* The first entry in a PIC lazy procedure linkage table look like
564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
565 lazy_plt->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
574 this. */
575
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
577 {
578 0xff, 0xa3, /* jmp *offset(%ebx) */
579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
580 0x68, /* pushl immediate */
581 0, 0, 0, 0, /* replaced with offset into relocation table. */
582 0xe9, /* jmp relative */
583 0, 0, 0, 0 /* replaced with offset to start of .plt. */
584 };
585
586 /* Entries in the non-lazy procedure linkage table look like this. */
587
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
589 {
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
593 };
594
595 /* Entries in the PIC non-lazy procedure linkage table look like
596 this. */
597
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
599 {
600 0xff, 0xa3, /* jmp *offset(%ebx) */
601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
602 0x66, 0x90 /* xchg %ax,%ax */
603 };
604
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
607
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
609 {
610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
613 };
614
615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
616 table look like this. Subsequent entries for a PIC IBT-enabled lazy
617 procedure linkage table are the same. */
618
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
620 {
621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
622 0x68, 0, 0, 0, 0, /* pushl immediate */
623 0xe9, 0, 0, 0, 0, /* jmp relative */
624 0x66, 0x90 /* xchg %ax,%ax */
625 };
626
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
628 look like. */
629
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
631 {
632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
635 };
636
637 /* Entries for branches with IBT-enabled in the absolute non-lazey
638 procedure linkage table look like this. They have the same size
639 as the lazy PLT entry. */
640
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
642 {
643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 };
647
648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
649 linkage table look like this. They have the same size as the lazy
650 PLT entry. */
651
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
653 {
654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
657 };
658
659 /* .eh_frame covering the lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
662 {
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
665 1, /* CIE version */
666 'z', 'R', 0, /* Augmentation string */
667 1, /* Code alignment factor */
668 0x7c, /* Data alignment factor */
669 8, /* Return address column */
670 1, /* Augmentation size */
671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
674 DW_CFA_nop, DW_CFA_nop,
675
676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
679 0, 0, 0, 0, /* .plt size goes here */
680 0, /* Augmentation size */
681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
686 11, /* Block length */
687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
690 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
692 };
693
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
695
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
697 {
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
700 1, /* CIE version */
701 'z', 'R', 0, /* Augmentation string */
702 1, /* Code alignment factor */
703 0x7c, /* Data alignment factor */
704 8, /* Return address column */
705 1, /* Augmentation size */
706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
709 DW_CFA_nop, DW_CFA_nop,
710
711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
714 0, 0, 0, 0, /* .plt size goes here */
715 0, /* Augmentation size */
716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
721 11, /* Block length */
722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
727 };
728
729 /* .eh_frame covering the non-lazy .plt section. */
730
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
732 {
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
736 1, /* CIE version */
737 'z', 'R', 0, /* Augmentation string */
738 1, /* Code alignment factor */
739 0x7c, /* Data alignment factor */
740 8, /* Return address column */
741 1, /* Augmentation size */
742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
745 DW_CFA_nop, DW_CFA_nop,
746
747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
750 0, 0, 0, 0, /* non-lazy .plt size goes here */
751 0, /* Augmentation size */
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
757 {
758 elf_i386_lazy_plt0_entry, /* plt0_entry */
759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
760 elf_i386_lazy_plt_entry, /* plt_entry */
761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
762 NULL, /* plt_tlsdesc_entry */
763 0, /* plt_tlsdesc_entry_size*/
764 0, /* plt_tlsdesc_got1_offset */
765 0, /* plt_tlsdesc_got2_offset */
766 0, /* plt_tlsdesc_got1_insn_end */
767 0, /* plt_tlsdesc_got2_insn_end */
768 2, /* plt0_got1_offset */
769 8, /* plt0_got2_offset */
770 0, /* plt0_got2_insn_end */
771 2, /* plt_got_offset */
772 7, /* plt_reloc_offset */
773 12, /* plt_plt_offset */
774 0, /* plt_got_insn_size */
775 0, /* plt_plt_insn_end */
776 6, /* plt_lazy_offset */
777 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
778 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
779 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
780 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
781 };
782
783 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
784 {
785 elf_i386_non_lazy_plt_entry, /* plt_entry */
786 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
787 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
788 2, /* plt_got_offset */
789 0, /* plt_got_insn_size */
790 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
791 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
792 };
793
794 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
795 {
796 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
797 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
798 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
799 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
800 NULL, /* plt_tlsdesc_entry */
801 0, /* plt_tlsdesc_entry_size*/
802 0, /* plt_tlsdesc_got1_offset */
803 0, /* plt_tlsdesc_got2_offset */
804 0, /* plt_tlsdesc_got1_insn_end */
805 0, /* plt_tlsdesc_got2_insn_end */
806 2, /* plt0_got1_offset */
807 8, /* plt0_got2_offset */
808 0, /* plt0_got2_insn_end */
809 4+2, /* plt_got_offset */
810 4+1, /* plt_reloc_offset */
811 4+6, /* plt_plt_offset */
812 0, /* plt_got_insn_size */
813 0, /* plt_plt_insn_end */
814 0, /* plt_lazy_offset */
815 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
816 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
817 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
818 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
819 };
820
821 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
822 {
823 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
824 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
825 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
826 4+2, /* plt_got_offset */
827 0, /* plt_got_insn_size */
828 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
829 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
830 };
831 \f
832
833 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
834 for the PLTResolve stub and then for each PLT entry. */
835 #define PLTRESOLVE_RELOCS_SHLIB 0
836 #define PLTRESOLVE_RELOCS 2
837 #define PLT_NON_JUMP_SLOT_RELOCS 2
838
839 /* Return TRUE if the TLS access code sequence support transition
840 from R_TYPE. */
841
842 static bool
843 elf_i386_check_tls_transition (asection *sec,
844 bfd_byte *contents,
845 Elf_Internal_Shdr *symtab_hdr,
846 struct elf_link_hash_entry **sym_hashes,
847 unsigned int r_type,
848 const Elf_Internal_Rela *rel,
849 const Elf_Internal_Rela *relend)
850 {
851 unsigned int val, type, reg;
852 unsigned long r_symndx;
853 struct elf_link_hash_entry *h;
854 bfd_vma offset;
855 bfd_byte *call;
856 bool indirect_call;
857
858 offset = rel->r_offset;
859 switch (r_type)
860 {
861 case R_386_TLS_GD:
862 case R_386_TLS_LDM:
863 if (offset < 2 || (rel + 1) >= relend)
864 return false;
865
866 indirect_call = false;
867 call = contents + offset + 4;
868 val = *(call - 5);
869 type = *(call - 6);
870 if (r_type == R_386_TLS_GD)
871 {
872 /* Check transition from GD access model. Only
873 leal foo@tlsgd(,%ebx,1), %eax
874 call ___tls_get_addr@PLT
875 or
876 leal foo@tlsgd(%ebx) %eax
877 call ___tls_get_addr@PLT
878 nop
879 or
880 leal foo@tlsgd(%reg), %eax
881 call *___tls_get_addr@GOT(%reg)
882 which may be converted to
883 addr32 call ___tls_get_addr
884 can transit to different access model. */
885 if ((offset + 10) > sec->size
886 || (type != 0x8d && type != 0x04))
887 return false;
888
889 if (type == 0x04)
890 {
891 /* leal foo@tlsgd(,%ebx,1), %eax
892 call ___tls_get_addr@PLT */
893 if (offset < 3)
894 return false;
895
896 if (*(call - 7) != 0x8d
897 || val != 0x1d
898 || call[0] != 0xe8)
899 return false;
900 }
901 else
902 {
903 /* This must be
904 leal foo@tlsgd(%ebx), %eax
905 call ___tls_get_addr@PLT
906 nop
907 or
908 leal foo@tlsgd(%reg), %eax
909 call *___tls_get_addr@GOT(%reg)
910 which may be converted to
911 addr32 call ___tls_get_addr
912
913 %eax can't be used as the GOT base register since it
914 is used to pass parameter to ___tls_get_addr. */
915 reg = val & 7;
916 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
917 return false;
918
919 indirect_call = call[0] == 0xff;
920 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
921 && !(call[0] == 0x67 && call[1] == 0xe8)
922 && !(indirect_call
923 && (call[1] & 0xf8) == 0x90
924 && (call[1] & 0x7) == reg))
925 return false;
926 }
927 }
928 else
929 {
930 /* Check transition from LD access model. Only
931 leal foo@tlsldm(%ebx), %eax
932 call ___tls_get_addr@PLT
933 or
934 leal foo@tlsldm(%reg), %eax
935 call *___tls_get_addr@GOT(%reg)
936 which may be converted to
937 addr32 call ___tls_get_addr
938 can transit to different access model. */
939 if (type != 0x8d || (offset + 9) > sec->size)
940 return false;
941
942 /* %eax can't be used as the GOT base register since it is
943 used to pass parameter to ___tls_get_addr. */
944 reg = val & 7;
945 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
946 return false;
947
948 indirect_call = call[0] == 0xff;
949 if (!(reg == 3 && call[0] == 0xe8)
950 && !(call[0] == 0x67 && call[1] == 0xe8)
951 && !(indirect_call
952 && (call[1] & 0xf8) == 0x90
953 && (call[1] & 0x7) == reg))
954 return false;
955 }
956
957 r_symndx = ELF32_R_SYM (rel[1].r_info);
958 if (r_symndx < symtab_hdr->sh_info)
959 return false;
960
961 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
962 if (h == NULL
963 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
964 return false;
965 else if (indirect_call)
966 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X
967 || ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32);
968 else
969 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
970 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
971
972 case R_386_TLS_IE:
973 /* Check transition from IE access model:
974 movl foo@indntpoff(%rip), %eax
975 movl foo@indntpoff(%rip), %reg
976 addl foo@indntpoff(%rip), %reg
977 */
978
979 if (offset < 1 || (offset + 4) > sec->size)
980 return false;
981
982 /* Check "movl foo@tpoff(%rip), %eax" first. */
983 val = bfd_get_8 (abfd, contents + offset - 1);
984 if (val == 0xa1)
985 return true;
986
987 if (offset < 2)
988 return false;
989
990 /* Check movl|addl foo@tpoff(%rip), %reg. */
991 type = bfd_get_8 (abfd, contents + offset - 2);
992 return ((type == 0x8b || type == 0x03)
993 && (val & 0xc7) == 0x05);
994
995 case R_386_TLS_GOTIE:
996 case R_386_TLS_IE_32:
997 /* Check transition from {IE_32,GOTIE} access model:
998 subl foo@{tpoff,gontoff}(%reg1), %reg2
999 movl foo@{tpoff,gontoff}(%reg1), %reg2
1000 addl foo@{tpoff,gontoff}(%reg1), %reg2
1001 */
1002
1003 if (offset < 2 || (offset + 4) > sec->size)
1004 return false;
1005
1006 val = bfd_get_8 (abfd, contents + offset - 1);
1007 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1008 return false;
1009
1010 type = bfd_get_8 (abfd, contents + offset - 2);
1011 return type == 0x8b || type == 0x2b || type == 0x03;
1012
1013 case R_386_TLS_GOTDESC:
1014 /* Check transition from GDesc access model:
1015 leal x@tlsdesc(%ebx), %eax
1016
1017 Make sure it's a leal adding ebx to a 32-bit offset
1018 into any register, although it's probably almost always
1019 going to be eax. */
1020
1021 if (offset < 2 || (offset + 4) > sec->size)
1022 return false;
1023
1024 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1025 return false;
1026
1027 val = bfd_get_8 (abfd, contents + offset - 1);
1028 return (val & 0xc7) == 0x83;
1029
1030 case R_386_TLS_DESC_CALL:
1031 /* Check transition from GDesc access model:
1032 call *x@tlsdesc(%eax)
1033 */
1034 if (offset + 2 <= sec->size)
1035 {
1036 /* Make sure that it's a call *x@tlsdesc(%eax). */
1037 call = contents + offset;
1038 return call[0] == 0xff && call[1] == 0x10;
1039 }
1040
1041 return false;
1042
1043 default:
1044 abort ();
1045 }
1046 }
1047
1048 /* Return TRUE if the TLS access transition is OK or no transition
1049 will be performed. Update R_TYPE if there is a transition. */
1050
1051 static bool
1052 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1053 asection *sec, bfd_byte *contents,
1054 Elf_Internal_Shdr *symtab_hdr,
1055 struct elf_link_hash_entry **sym_hashes,
1056 unsigned int *r_type, int tls_type,
1057 const Elf_Internal_Rela *rel,
1058 const Elf_Internal_Rela *relend,
1059 struct elf_link_hash_entry *h,
1060 unsigned long r_symndx,
1061 bool from_relocate_section)
1062 {
1063 unsigned int from_type = *r_type;
1064 unsigned int to_type = from_type;
1065 bool check = true;
1066 unsigned int to_le_type, to_ie_type;
1067
1068 /* Skip TLS transition for functions. */
1069 if (h != NULL
1070 && (h->type == STT_FUNC
1071 || h->type == STT_GNU_IFUNC))
1072 return true;
1073
1074 if (get_elf_backend_data (abfd)->target_os == is_solaris)
1075 {
1076 /* NB: Solaris only supports R_386_TLS_LE and R_386_TLS_IE. */
1077 to_le_type = R_386_TLS_LE;
1078 to_ie_type = R_386_TLS_IE;
1079 }
1080 else
1081 {
1082 to_le_type = R_386_TLS_LE_32;
1083 to_ie_type = R_386_TLS_IE_32;
1084 }
1085
1086 switch (from_type)
1087 {
1088 case R_386_TLS_GD:
1089 case R_386_TLS_GOTDESC:
1090 case R_386_TLS_DESC_CALL:
1091 case R_386_TLS_IE_32:
1092 case R_386_TLS_IE:
1093 case R_386_TLS_GOTIE:
1094 if (bfd_link_executable (info))
1095 {
1096 if (h == NULL)
1097 to_type = to_le_type;
1098 else if (from_type != R_386_TLS_IE
1099 && from_type != R_386_TLS_GOTIE)
1100 to_type = to_ie_type;
1101 }
1102
1103 /* When we are called from elf_i386_relocate_section, there may
1104 be additional transitions based on TLS_TYPE. */
1105 if (from_relocate_section)
1106 {
1107 unsigned int new_to_type = to_type;
1108
1109 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1110 new_to_type = to_le_type;
1111
1112 if (to_type == R_386_TLS_GD
1113 || to_type == R_386_TLS_GOTDESC
1114 || to_type == R_386_TLS_DESC_CALL)
1115 {
1116 if (tls_type == GOT_TLS_IE_POS)
1117 new_to_type = R_386_TLS_GOTIE;
1118 else if (tls_type & GOT_TLS_IE)
1119 new_to_type = to_ie_type;
1120 }
1121
1122 /* We checked the transition before when we were called from
1123 elf_i386_scan_relocs. We only want to check the new
1124 transition which hasn't been checked before. */
1125 check = new_to_type != to_type && from_type == to_type;
1126 to_type = new_to_type;
1127 }
1128
1129 break;
1130
1131 case R_386_TLS_LDM:
1132 if (bfd_link_executable (info))
1133 to_type = to_le_type;
1134 break;
1135
1136 default:
1137 return true;
1138 }
1139
1140 /* Return TRUE if there is no transition. */
1141 if (from_type == to_type)
1142 return true;
1143
1144 /* Check if the transition can be performed. */
1145 if (check
1146 && ! elf_i386_check_tls_transition (sec, contents,
1147 symtab_hdr, sym_hashes,
1148 from_type, rel, relend))
1149 {
1150 reloc_howto_type *from, *to;
1151 const char *name;
1152
1153 from = elf_i386_rtype_to_howto (from_type);
1154 to = elf_i386_rtype_to_howto (to_type);
1155
1156 if (h)
1157 name = h->root.root.string;
1158 else
1159 {
1160 struct elf_x86_link_hash_table *htab;
1161
1162 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1163 if (htab == NULL)
1164 name = "*unknown*";
1165 else
1166 {
1167 Elf_Internal_Sym *isym;
1168
1169 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1170 abfd, r_symndx);
1171 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1172 }
1173 }
1174
1175 _bfd_error_handler
1176 /* xgettext:c-format */
1177 (_("%pB: TLS transition from %s to %s against `%s'"
1178 " at %#" PRIx64 " in section `%pA' failed"),
1179 abfd, from->name, to->name, name,
1180 (uint64_t) rel->r_offset, sec);
1181 bfd_set_error (bfd_error_bad_value);
1182 return false;
1183 }
1184
1185 *r_type = to_type;
1186 return true;
1187 }
1188
1189 /* With the local symbol, foo, we convert
1190 mov foo@GOT[(%reg1)], %reg2
1191 to
1192 lea foo[@GOTOFF(%reg1)], %reg2
1193 and convert
1194 call/jmp *foo@GOT[(%reg)]
1195 to
1196 nop call foo/jmp foo nop
1197 When PIC is false, convert
1198 test %reg1, foo@GOT[(%reg2)]
1199 to
1200 test $foo, %reg1
1201 and convert
1202 binop foo@GOT[(%reg1)], %reg2
1203 to
1204 binop $foo, %reg2
1205 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1206 instructions. */
1207
1208 static
1209 bool
1210 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1211 bfd_byte *contents,
1212 unsigned int *r_type_p,
1213 Elf_Internal_Rela *irel,
1214 struct elf_link_hash_entry *h,
1215 bool *converted,
1216 struct bfd_link_info *link_info)
1217 {
1218 struct elf_x86_link_hash_table *htab;
1219 unsigned int opcode;
1220 unsigned int modrm;
1221 bool baseless;
1222 Elf_Internal_Sym *isym;
1223 unsigned int addend;
1224 unsigned int nop;
1225 bfd_vma nop_offset;
1226 bool is_pic;
1227 bool to_reloc_32;
1228 bool abs_symbol;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bool local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1234
1235 if (roff < 2)
1236 return true;
1237
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1240 if (addend != 0)
1241 return true;
1242
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 if (htab == NULL || ! is_x86_elf (abfd, htab))
1245 {
1246 bfd_set_error (bfd_error_wrong_format);
1247 return false;
1248 }
1249
1250 is_pic = bfd_link_pic (link_info);
1251
1252 r_type = *r_type_p;
1253 r_symndx = ELF32_R_SYM (irel->r_info);
1254
1255 modrm = bfd_get_8 (abfd, contents + roff - 1);
1256 baseless = (modrm & 0xc7) == 0x5;
1257
1258 if (h)
1259 {
1260 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1261 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1262 isym = NULL;
1263 abs_symbol = ABS_SYMBOL_P (h);
1264 }
1265 else
1266 {
1267 local_ref = true;
1268 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1269 r_symndx);
1270 abs_symbol = isym->st_shndx == SHN_ABS;
1271 }
1272
1273 if (baseless && is_pic)
1274 {
1275 /* For PIC, disallow R_386_GOT32X without a base register
1276 since we don't know what the GOT base is. */
1277 const char *name;
1278
1279 if (h == NULL)
1280 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1281 else
1282 name = h->root.root.string;
1283
1284 _bfd_error_handler
1285 /* xgettext:c-format */
1286 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1287 " register can not be used when making a shared object"),
1288 abfd, name);
1289 return false;
1290 }
1291
1292 opcode = bfd_get_8 (abfd, contents + roff - 2);
1293
1294 /* Convert to R_386_32 if PIC is false or there is no base
1295 register. */
1296 to_reloc_32 = !is_pic || baseless;
1297
1298 eh = elf_x86_hash_entry (h);
1299
1300 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1301 reloc. */
1302 if (h == NULL)
1303 {
1304 if (opcode == 0x0ff)
1305 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1306 goto convert_branch;
1307 else
1308 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1309 "test %reg1, foo@GOT(%reg2)" and
1310 "binop foo@GOT[(%reg1)], %reg2". */
1311 goto convert_load;
1312 }
1313
1314 /* Undefined weak symbol is only bound locally in executable
1315 and its reference is resolved as 0. */
1316 if (h->root.type == bfd_link_hash_undefweak
1317 && !eh->linker_def
1318 && local_ref)
1319 {
1320 if (opcode == 0xff)
1321 {
1322 /* No direct branch to 0 for PIC. */
1323 if (is_pic)
1324 return true;
1325 else
1326 goto convert_branch;
1327 }
1328 else
1329 {
1330 /* We can convert load of address 0 to R_386_32. */
1331 to_reloc_32 = true;
1332 goto convert_load;
1333 }
1334 }
1335
1336 if (opcode == 0xff)
1337 {
1338 /* We have "call/jmp *foo@GOT[(%reg)]". */
1339 if ((h->root.type == bfd_link_hash_defined
1340 || h->root.type == bfd_link_hash_defweak)
1341 && local_ref)
1342 {
1343 /* The function is locally defined. */
1344 convert_branch:
1345 /* Convert R_386_GOT32X to R_386_PC32. */
1346 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1347 {
1348 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1349 is a nop prefix. */
1350 modrm = 0xe8;
1351 /* To support TLS optimization, always use addr32 prefix
1352 for "call *___tls_get_addr@GOT(%reg)". */
1353 if (eh && eh->tls_get_addr)
1354 {
1355 nop = 0x67;
1356 nop_offset = irel->r_offset - 2;
1357 }
1358 else
1359 {
1360 nop = htab->params->call_nop_byte;
1361 if (htab->params->call_nop_as_suffix)
1362 {
1363 nop_offset = roff + 3;
1364 irel->r_offset -= 1;
1365 }
1366 else
1367 nop_offset = roff - 2;
1368 }
1369 }
1370 else
1371 {
1372 /* Convert to "jmp foo nop". */
1373 modrm = 0xe9;
1374 nop = NOP_OPCODE;
1375 nop_offset = roff + 3;
1376 irel->r_offset -= 1;
1377 }
1378
1379 bfd_put_8 (abfd, nop, contents + nop_offset);
1380 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1381 /* When converting to PC-relative relocation, we
1382 need to adjust addend by -4. */
1383 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1384 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1385 *r_type_p = R_386_PC32;
1386 *converted = true;
1387 }
1388 }
1389 else
1390 {
1391 /* We have "mov foo@GOT[(%re1g)], %reg2",
1392 "test %reg1, foo@GOT(%reg2)" and
1393 "binop foo@GOT[(%reg1)], %reg2".
1394
1395 Avoid optimizing _DYNAMIC since ld.so may use its
1396 link-time address. */
1397 if (h == htab->elf.hdynamic)
1398 return true;
1399
1400 /* def_regular is set by an assignment in a linker script in
1401 bfd_elf_record_link_assignment. start_stop is set on
1402 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1403 if (h->start_stop
1404 || eh->linker_def
1405 || ((h->def_regular
1406 || h->root.type == bfd_link_hash_defined
1407 || h->root.type == bfd_link_hash_defweak)
1408 && local_ref))
1409 {
1410 convert_load:
1411 if (opcode == 0x8b)
1412 {
1413 if (abs_symbol && local_ref)
1414 to_reloc_32 = true;
1415
1416 if (to_reloc_32)
1417 {
1418 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1419 "mov $foo, %reg2" with R_386_32. */
1420 r_type = R_386_32;
1421 modrm = 0xc0 | (modrm & 0x38) >> 3;
1422 bfd_put_8 (abfd, modrm, contents + roff - 1);
1423 opcode = 0xc7;
1424 }
1425 else
1426 {
1427 /* Convert "mov foo@GOT(%reg1), %reg2" to
1428 "lea foo@GOTOFF(%reg1), %reg2". */
1429 r_type = R_386_GOTOFF;
1430 opcode = 0x8d;
1431 }
1432 }
1433 else
1434 {
1435 /* Only R_386_32 is supported. */
1436 if (!to_reloc_32)
1437 return true;
1438
1439 if (opcode == 0x85)
1440 {
1441 /* Convert "test %reg1, foo@GOT(%reg2)" to
1442 "test $foo, %reg1". */
1443 modrm = 0xc0 | (modrm & 0x38) >> 3;
1444 opcode = 0xf7;
1445 }
1446 else
1447 {
1448 /* Convert "binop foo@GOT(%reg1), %reg2" to
1449 "binop $foo, %reg2". */
1450 modrm = (0xc0
1451 | (modrm & 0x38) >> 3
1452 | (opcode & 0x3c));
1453 opcode = 0x81;
1454 }
1455 bfd_put_8 (abfd, modrm, contents + roff - 1);
1456 r_type = R_386_32;
1457 }
1458
1459 bfd_put_8 (abfd, opcode, contents + roff - 2);
1460 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1461 *r_type_p = r_type;
1462 *converted = true;
1463 }
1464 }
1465
1466 return true;
1467 }
1468
1469 /* Look through the relocs for a section during the first phase, and
1470 calculate needed space in the global offset table, and procedure
1471 linkage table. */
1472
1473 static bool
1474 elf_i386_scan_relocs (bfd *abfd,
1475 struct bfd_link_info *info,
1476 asection *sec,
1477 const Elf_Internal_Rela *relocs)
1478 {
1479 struct elf_x86_link_hash_table *htab;
1480 Elf_Internal_Shdr *symtab_hdr;
1481 struct elf_link_hash_entry **sym_hashes;
1482 const Elf_Internal_Rela *rel;
1483 const Elf_Internal_Rela *rel_end;
1484 bfd_byte *contents;
1485 bool converted;
1486
1487 if (bfd_link_relocatable (info))
1488 return true;
1489
1490 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1491 if (htab == NULL)
1492 {
1493 sec->check_relocs_failed = 1;
1494 return false;
1495 }
1496
1497 BFD_ASSERT (is_x86_elf (abfd, htab));
1498
1499 /* Get the section contents. */
1500 if (elf_section_data (sec)->this_hdr.contents != NULL)
1501 contents = elf_section_data (sec)->this_hdr.contents;
1502 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1503 {
1504 sec->check_relocs_failed = 1;
1505 return false;
1506 }
1507
1508 symtab_hdr = &elf_symtab_hdr (abfd);
1509 sym_hashes = elf_sym_hashes (abfd);
1510
1511 converted = false;
1512
1513 rel_end = relocs + sec->reloc_count;
1514 for (rel = relocs; rel < rel_end; rel++)
1515 {
1516 unsigned int r_type;
1517 unsigned int r_symndx;
1518 struct elf_link_hash_entry *h;
1519 struct elf_x86_link_hash_entry *eh;
1520 Elf_Internal_Sym *isym;
1521 const char *name;
1522 bool size_reloc;
1523 bool no_dynreloc;
1524
1525 r_symndx = ELF32_R_SYM (rel->r_info);
1526 r_type = ELF32_R_TYPE (rel->r_info);
1527
1528 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1529 {
1530 /* xgettext:c-format */
1531 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1532 abfd, r_symndx);
1533 goto error_return;
1534 }
1535
1536 if (r_symndx < symtab_hdr->sh_info)
1537 {
1538 /* A local symbol. */
1539 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1540 abfd, r_symndx);
1541 if (isym == NULL)
1542 goto error_return;
1543
1544 /* Check relocation against local STT_GNU_IFUNC symbol. */
1545 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1546 {
1547 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1548 if (h == NULL)
1549 goto error_return;
1550
1551 /* Fake a STT_GNU_IFUNC symbol. */
1552 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1553 isym, NULL);
1554 h->type = STT_GNU_IFUNC;
1555 h->def_regular = 1;
1556 h->ref_regular = 1;
1557 h->forced_local = 1;
1558 h->root.type = bfd_link_hash_defined;
1559 }
1560 else
1561 h = NULL;
1562 }
1563 else
1564 {
1565 isym = NULL;
1566 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1567 while (h->root.type == bfd_link_hash_indirect
1568 || h->root.type == bfd_link_hash_warning)
1569 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1570 }
1571
1572 eh = (struct elf_x86_link_hash_entry *) h;
1573 if (h != NULL)
1574 {
1575 if (r_type == R_386_GOTOFF)
1576 eh->gotoff_ref = 1;
1577
1578 /* It is referenced by a non-shared object. */
1579 h->ref_regular = 1;
1580 }
1581
1582 if (r_type == R_386_GOT32X
1583 && (h == NULL || h->type != STT_GNU_IFUNC))
1584 {
1585 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1586 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1587 &r_type, irel, h,
1588 &converted, info))
1589 goto error_return;
1590 }
1591
1592 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1593 symtab_hdr, &no_dynreloc))
1594 return false;
1595
1596 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1597 symtab_hdr, sym_hashes,
1598 &r_type, GOT_UNKNOWN,
1599 rel, rel_end, h, r_symndx, false))
1600 goto error_return;
1601
1602 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1603 if (h == htab->elf.hgot)
1604 htab->got_referenced = true;
1605
1606 switch (r_type)
1607 {
1608 case R_386_TLS_LDM:
1609 htab->tls_ld_or_ldm_got.refcount = 1;
1610 goto create_got;
1611
1612 case R_386_PLT32:
1613 /* This symbol requires a procedure linkage table entry. We
1614 actually build the entry in adjust_dynamic_symbol,
1615 because this might be a case of linking PIC code which is
1616 never referenced by a dynamic object, in which case we
1617 don't need to generate a procedure linkage table entry
1618 after all. */
1619
1620 /* If this is a local symbol, we resolve it directly without
1621 creating a procedure linkage table entry. */
1622 if (h == NULL)
1623 continue;
1624
1625 eh->zero_undefweak &= 0x2;
1626 h->needs_plt = 1;
1627 h->plt.refcount = 1;
1628 break;
1629
1630 case R_386_SIZE32:
1631 size_reloc = true;
1632 goto do_size;
1633
1634 case R_386_TLS_IE_32:
1635 case R_386_TLS_IE:
1636 case R_386_TLS_GOTIE:
1637 if (!bfd_link_executable (info))
1638 info->flags |= DF_STATIC_TLS;
1639 /* Fall through */
1640
1641 case R_386_GOT32:
1642 case R_386_GOT32X:
1643 case R_386_TLS_GD:
1644 case R_386_TLS_GOTDESC:
1645 case R_386_TLS_DESC_CALL:
1646 /* This symbol requires a global offset table entry. */
1647 {
1648 int tls_type, old_tls_type;
1649
1650 switch (r_type)
1651 {
1652 default:
1653 case R_386_GOT32:
1654 case R_386_GOT32X:
1655 tls_type = GOT_NORMAL;
1656 break;
1657 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1658 case R_386_TLS_GOTDESC:
1659 case R_386_TLS_DESC_CALL:
1660 tls_type = GOT_TLS_GDESC; break;
1661 case R_386_TLS_IE_32:
1662 if (ELF32_R_TYPE (rel->r_info) == r_type)
1663 tls_type = GOT_TLS_IE_NEG;
1664 else
1665 /* If this is a GD->IE transition, we may use either of
1666 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1667 tls_type = GOT_TLS_IE;
1668 break;
1669 case R_386_TLS_IE:
1670 case R_386_TLS_GOTIE:
1671 tls_type = GOT_TLS_IE_POS; break;
1672 }
1673
1674 if (h != NULL)
1675 {
1676 h->got.refcount = 1;
1677 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1678 }
1679 else
1680 {
1681 bfd_signed_vma *local_got_refcounts;
1682
1683 if (!elf_x86_allocate_local_got_info (abfd,
1684 symtab_hdr->sh_info))
1685 goto error_return;
1686
1687 /* This is a global offset table entry for a local symbol. */
1688 local_got_refcounts = elf_local_got_refcounts (abfd);
1689 local_got_refcounts[r_symndx] = 1;
1690 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1691 }
1692
1693 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1694 tls_type |= old_tls_type;
1695 /* If a TLS symbol is accessed using IE at least once,
1696 there is no point to use dynamic model for it. */
1697 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1698 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1699 || (tls_type & GOT_TLS_IE) == 0))
1700 {
1701 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1702 tls_type = old_tls_type;
1703 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1704 && GOT_TLS_GD_ANY_P (tls_type))
1705 tls_type |= old_tls_type;
1706 else
1707 {
1708 if (h)
1709 name = h->root.root.string;
1710 else
1711 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1712 NULL);
1713 _bfd_error_handler
1714 /* xgettext:c-format */
1715 (_("%pB: `%s' accessed both as normal and "
1716 "thread local symbol"),
1717 abfd, name);
1718 bfd_set_error (bfd_error_bad_value);
1719 goto error_return;
1720 }
1721 }
1722
1723 if (old_tls_type != tls_type)
1724 {
1725 if (h != NULL)
1726 elf_x86_hash_entry (h)->tls_type = tls_type;
1727 else
1728 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1729 }
1730 }
1731 /* Fall through */
1732
1733 case R_386_GOTOFF:
1734 case R_386_GOTPC:
1735 create_got:
1736 if (r_type != R_386_TLS_IE)
1737 {
1738 if (eh != NULL)
1739 {
1740 eh->zero_undefweak &= 0x2;
1741
1742 /* Need GOT to resolve undefined weak symbol to 0. */
1743 if (r_type == R_386_GOTOFF
1744 && h->root.type == bfd_link_hash_undefweak
1745 && bfd_link_executable (info))
1746 htab->got_referenced = true;
1747 }
1748 break;
1749 }
1750 /* Fall through */
1751
1752 case R_386_TLS_LE_32:
1753 case R_386_TLS_LE:
1754 if (eh != NULL)
1755 eh->zero_undefweak &= 0x2;
1756 if (bfd_link_executable (info))
1757 break;
1758 info->flags |= DF_STATIC_TLS;
1759 goto do_relocation;
1760
1761 case R_386_32:
1762 case R_386_PC32:
1763 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1764 eh->zero_undefweak |= 0x2;
1765 do_relocation:
1766 /* We are called after all symbols have been resolved. Only
1767 relocation against STT_GNU_IFUNC symbol must go through
1768 PLT. */
1769 if (h != NULL
1770 && (bfd_link_executable (info)
1771 || h->type == STT_GNU_IFUNC))
1772 {
1773 bool func_pointer_ref = false;
1774
1775 if (r_type == R_386_PC32)
1776 {
1777 /* Since something like ".long foo - ." may be used
1778 as pointer, make sure that PLT is used if foo is
1779 a function defined in a shared library. */
1780 if ((sec->flags & SEC_CODE) == 0)
1781 h->pointer_equality_needed = 1;
1782 else if (h->type == STT_GNU_IFUNC
1783 && bfd_link_pic (info))
1784 {
1785 _bfd_error_handler
1786 /* xgettext:c-format */
1787 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1788 abfd, h->root.root.string);
1789 bfd_set_error (bfd_error_bad_value);
1790 goto error_return;
1791 }
1792 }
1793 else
1794 {
1795 /* R_386_32 can be resolved at run-time. Function
1796 pointer reference doesn't need PLT for pointer
1797 equality. */
1798 if (r_type == R_386_32
1799 && (sec->flags & SEC_READONLY) == 0)
1800 func_pointer_ref = true;
1801
1802 /* IFUNC symbol needs pointer equality in PDE so that
1803 function pointer reference will be resolved to its
1804 PLT entry directly. */
1805 if (!func_pointer_ref
1806 || (bfd_link_pde (info)
1807 && h->type == STT_GNU_IFUNC))
1808 h->pointer_equality_needed = 1;
1809 }
1810
1811 if (!func_pointer_ref)
1812 {
1813 /* If this reloc is in a read-only section, we might
1814 need a copy reloc. We can't check reliably at this
1815 stage whether the section is read-only, as input
1816 sections have not yet been mapped to output sections.
1817 Tentatively set the flag for now, and correct in
1818 adjust_dynamic_symbol. */
1819 h->non_got_ref = 1;
1820
1821 if (!elf_has_indirect_extern_access (sec->owner))
1822 eh->non_got_ref_without_indirect_extern_access = 1;
1823
1824 /* We may need a .plt entry if the symbol is a function
1825 defined in a shared lib or is a function referenced
1826 from the code or read-only section. */
1827 if (!h->def_regular
1828 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1829 h->plt.refcount = 1;
1830
1831 if (htab->elf.target_os != is_solaris
1832 && h->pointer_equality_needed
1833 && h->type == STT_FUNC
1834 && eh->def_protected
1835 && !SYMBOL_DEFINED_NON_SHARED_P (h)
1836 && h->def_dynamic)
1837 {
1838 /* Disallow non-canonical reference to canonical
1839 protected function. */
1840 _bfd_error_handler
1841 /* xgettext:c-format */
1842 (_("%pB: non-canonical reference to canonical "
1843 "protected function `%s' in %pB"),
1844 abfd, h->root.root.string,
1845 h->root.u.def.section->owner);
1846 bfd_set_error (bfd_error_bad_value);
1847 goto error_return;
1848 }
1849 }
1850 }
1851
1852 size_reloc = false;
1853 do_size:
1854 if (!no_dynreloc
1855 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
1856 r_type, R_386_32))
1857 {
1858 struct elf_dyn_relocs *p;
1859 struct elf_dyn_relocs **head;
1860
1861 /* If this is a global symbol, we count the number of
1862 relocations we need for this symbol. */
1863 if (h != NULL)
1864 {
1865 head = &h->dyn_relocs;
1866 }
1867 else
1868 {
1869 /* Track dynamic relocs needed for local syms too.
1870 We really need local syms available to do this
1871 easily. Oh well. */
1872 void **vpp;
1873 asection *s;
1874
1875 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1876 abfd, r_symndx);
1877 if (isym == NULL)
1878 goto error_return;
1879
1880 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1881 if (s == NULL)
1882 s = sec;
1883
1884 vpp = &elf_section_data (s)->local_dynrel;
1885 head = (struct elf_dyn_relocs **)vpp;
1886 }
1887
1888 p = *head;
1889 if (p == NULL || p->sec != sec)
1890 {
1891 size_t amt = sizeof *p;
1892 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1893 amt);
1894 if (p == NULL)
1895 goto error_return;
1896 p->next = *head;
1897 *head = p;
1898 p->sec = sec;
1899 p->count = 0;
1900 p->pc_count = 0;
1901 }
1902
1903 p->count += 1;
1904 /* Count size relocation as PC-relative relocation. */
1905 if (r_type == R_386_PC32 || size_reloc)
1906 p->pc_count += 1;
1907 }
1908 break;
1909
1910 /* This relocation describes the C++ object vtable hierarchy.
1911 Reconstruct it for later use during GC. */
1912 case R_386_GNU_VTINHERIT:
1913 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1914 goto error_return;
1915 break;
1916
1917 /* This relocation describes which C++ vtable entries are actually
1918 used. Record for later use during GC. */
1919 case R_386_GNU_VTENTRY:
1920 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1921 goto error_return;
1922 break;
1923
1924 default:
1925 break;
1926 }
1927 }
1928
1929 if (elf_section_data (sec)->this_hdr.contents != contents)
1930 {
1931 if (!converted && !_bfd_link_keep_memory (info))
1932 free (contents);
1933 else
1934 {
1935 /* Cache the section contents for elf_link_input_bfd if any
1936 load is converted or --no-keep-memory isn't used. */
1937 elf_section_data (sec)->this_hdr.contents = contents;
1938 info->cache_size += sec->size;
1939 }
1940 }
1941
1942 /* Cache relocations if any load is converted. */
1943 if (elf_section_data (sec)->relocs != relocs && converted)
1944 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1945
1946 return true;
1947
1948 error_return:
1949 if (elf_section_data (sec)->this_hdr.contents != contents)
1950 free (contents);
1951 sec->check_relocs_failed = 1;
1952 return false;
1953 }
1954
1955 static bool
1956 elf_i386_always_size_sections (bfd *output_bfd,
1957 struct bfd_link_info *info)
1958 {
1959 bfd *abfd;
1960
1961 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
1962 for (abfd = info->input_bfds;
1963 abfd != (bfd *) NULL;
1964 abfd = abfd->link.next)
1965 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
1966 && !_bfd_elf_link_iterate_on_relocs (abfd, info,
1967 elf_i386_scan_relocs))
1968 return false;
1969
1970 return _bfd_x86_elf_always_size_sections (output_bfd, info);
1971 }
1972
1973 /* Set the correct type for an x86 ELF section. We do this by the
1974 section name, which is a hack, but ought to work. */
1975
1976 static bool
1977 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1978 Elf_Internal_Shdr *hdr,
1979 asection *sec)
1980 {
1981 const char *name;
1982
1983 name = bfd_section_name (sec);
1984
1985 /* This is an ugly, but unfortunately necessary hack that is
1986 needed when producing EFI binaries on x86. It tells
1987 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1988 containing ELF relocation info. We need this hack in order to
1989 be able to generate ELF binaries that can be translated into
1990 EFI applications (which are essentially COFF objects). Those
1991 files contain a COFF ".reloc" section inside an ELFNN object,
1992 which would normally cause BFD to segfault because it would
1993 attempt to interpret this section as containing relocation
1994 entries for section "oc". With this hack enabled, ".reloc"
1995 will be treated as a normal data section, which will avoid the
1996 segfault. However, you won't be able to create an ELFNN binary
1997 with a section named "oc" that needs relocations, but that's
1998 the kind of ugly side-effects you get when detecting section
1999 types based on their names... In practice, this limitation is
2000 unlikely to bite. */
2001 if (strcmp (name, ".reloc") == 0)
2002 hdr->sh_type = SHT_PROGBITS;
2003
2004 return true;
2005 }
2006
2007 /* Return the relocation value for @tpoff relocation
2008 if STT_TLS virtual address is ADDRESS. */
2009
2010 static bfd_vma
2011 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2012 {
2013 struct elf_link_hash_table *htab = elf_hash_table (info);
2014 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2015 bfd_vma static_tls_size;
2016
2017 /* If tls_sec is NULL, we should have signalled an error already. */
2018 if (htab->tls_sec == NULL)
2019 return 0;
2020
2021 /* Consider special static TLS alignment requirements. */
2022 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2023 return static_tls_size + htab->tls_sec->vma - address;
2024 }
2025
2026 /* Relocate an i386 ELF section. */
2027
2028 static int
2029 elf_i386_relocate_section (bfd *output_bfd,
2030 struct bfd_link_info *info,
2031 bfd *input_bfd,
2032 asection *input_section,
2033 bfd_byte *contents,
2034 Elf_Internal_Rela *relocs,
2035 Elf_Internal_Sym *local_syms,
2036 asection **local_sections)
2037 {
2038 struct elf_x86_link_hash_table *htab;
2039 Elf_Internal_Shdr *symtab_hdr;
2040 struct elf_link_hash_entry **sym_hashes;
2041 bfd_vma *local_got_offsets;
2042 bfd_vma *local_tlsdesc_gotents;
2043 Elf_Internal_Rela *rel;
2044 Elf_Internal_Rela *wrel;
2045 Elf_Internal_Rela *relend;
2046 bool is_vxworks_tls;
2047 unsigned expected_tls_le;
2048 unsigned plt_entry_size;
2049
2050 /* Skip if check_relocs or scan_relocs failed. */
2051 if (input_section->check_relocs_failed)
2052 return false;
2053
2054 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2055 if (htab == NULL)
2056 return false;
2057
2058 if (!is_x86_elf (input_bfd, htab))
2059 {
2060 bfd_set_error (bfd_error_wrong_format);
2061 return false;
2062 }
2063
2064 symtab_hdr = &elf_symtab_hdr (input_bfd);
2065 sym_hashes = elf_sym_hashes (input_bfd);
2066 local_got_offsets = elf_local_got_offsets (input_bfd);
2067 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2068 /* We have to handle relocations in vxworks .tls_vars sections
2069 specially, because the dynamic loader is 'weird'. */
2070 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2071 && bfd_link_pic (info)
2072 && !strcmp (input_section->output_section->name,
2073 ".tls_vars"));
2074
2075 _bfd_x86_elf_set_tls_module_base (info);
2076
2077 plt_entry_size = htab->plt.plt_entry_size;
2078
2079 rel = wrel = relocs;
2080 relend = relocs + input_section->reloc_count;
2081 for (; rel < relend; wrel++, rel++)
2082 {
2083 unsigned int r_type, r_type_tls;
2084 reloc_howto_type *howto;
2085 unsigned long r_symndx;
2086 struct elf_link_hash_entry *h;
2087 struct elf_x86_link_hash_entry *eh;
2088 Elf_Internal_Sym *sym;
2089 asection *sec;
2090 bfd_vma off, offplt, plt_offset;
2091 bfd_vma relocation;
2092 bool unresolved_reloc;
2093 bfd_reloc_status_type r;
2094 unsigned int indx;
2095 int tls_type;
2096 bfd_vma st_size;
2097 asection *resolved_plt;
2098 bool resolved_to_zero;
2099 bool relative_reloc;
2100
2101 r_type = ELF32_R_TYPE (rel->r_info);
2102 if (r_type == R_386_GNU_VTINHERIT
2103 || r_type == R_386_GNU_VTENTRY)
2104 {
2105 if (wrel != rel)
2106 *wrel = *rel;
2107 continue;
2108 }
2109
2110 howto = elf_i386_rtype_to_howto (r_type);
2111 if (howto == NULL)
2112 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2113
2114 r_symndx = ELF32_R_SYM (rel->r_info);
2115 h = NULL;
2116 sym = NULL;
2117 sec = NULL;
2118 unresolved_reloc = false;
2119 if (r_symndx < symtab_hdr->sh_info)
2120 {
2121 sym = local_syms + r_symndx;
2122 sec = local_sections[r_symndx];
2123 relocation = (sec->output_section->vma
2124 + sec->output_offset
2125 + sym->st_value);
2126 st_size = sym->st_size;
2127
2128 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2129 && ((sec->flags & SEC_MERGE) != 0
2130 || (bfd_link_relocatable (info)
2131 && sec->output_offset != 0)))
2132 {
2133 bfd_vma addend;
2134 bfd_byte *where = contents + rel->r_offset;
2135
2136 switch (bfd_get_reloc_size (howto))
2137 {
2138 case 1:
2139 addend = bfd_get_8 (input_bfd, where);
2140 if (howto->pc_relative)
2141 {
2142 addend = (addend ^ 0x80) - 0x80;
2143 addend += 1;
2144 }
2145 break;
2146 case 2:
2147 addend = bfd_get_16 (input_bfd, where);
2148 if (howto->pc_relative)
2149 {
2150 addend = (addend ^ 0x8000) - 0x8000;
2151 addend += 2;
2152 }
2153 break;
2154 case 4:
2155 addend = bfd_get_32 (input_bfd, where);
2156 if (howto->pc_relative)
2157 {
2158 addend = (addend ^ 0x80000000) - 0x80000000;
2159 addend += 4;
2160 }
2161 break;
2162 default:
2163 abort ();
2164 }
2165
2166 if (bfd_link_relocatable (info))
2167 addend += sec->output_offset;
2168 else
2169 {
2170 asection *msec = sec;
2171 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2172 addend);
2173 addend -= relocation;
2174 addend += msec->output_section->vma + msec->output_offset;
2175 }
2176
2177 switch (bfd_get_reloc_size (howto))
2178 {
2179 case 1:
2180 /* FIXME: overflow checks. */
2181 if (howto->pc_relative)
2182 addend -= 1;
2183 bfd_put_8 (input_bfd, addend, where);
2184 break;
2185 case 2:
2186 if (howto->pc_relative)
2187 addend -= 2;
2188 bfd_put_16 (input_bfd, addend, where);
2189 break;
2190 case 4:
2191 if (howto->pc_relative)
2192 addend -= 4;
2193 bfd_put_32 (input_bfd, addend, where);
2194 break;
2195 }
2196 }
2197 else if (!bfd_link_relocatable (info)
2198 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2199 {
2200 /* Relocate against local STT_GNU_IFUNC symbol. */
2201 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2202 false);
2203 if (h == NULL)
2204 abort ();
2205
2206 /* Set STT_GNU_IFUNC symbol value. */
2207 h->root.u.def.value = sym->st_value;
2208 h->root.u.def.section = sec;
2209 }
2210 }
2211 else
2212 {
2213 bool warned ATTRIBUTE_UNUSED;
2214 bool ignored ATTRIBUTE_UNUSED;
2215
2216 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2217 r_symndx, symtab_hdr, sym_hashes,
2218 h, sec, relocation,
2219 unresolved_reloc, warned, ignored);
2220 st_size = h->size;
2221 }
2222
2223 if (sec != NULL && discarded_section (sec))
2224 {
2225 _bfd_clear_contents (howto, input_bfd, input_section,
2226 contents, rel->r_offset);
2227 wrel->r_offset = rel->r_offset;
2228 wrel->r_info = 0;
2229 wrel->r_addend = 0;
2230
2231 /* For ld -r, remove relocations in debug sections against
2232 sections defined in discarded sections. Not done for
2233 eh_frame editing code expects to be present. */
2234 if (bfd_link_relocatable (info)
2235 && (input_section->flags & SEC_DEBUGGING))
2236 wrel--;
2237
2238 continue;
2239 }
2240
2241 if (bfd_link_relocatable (info))
2242 {
2243 if (wrel != rel)
2244 *wrel = *rel;
2245 continue;
2246 }
2247
2248 eh = (struct elf_x86_link_hash_entry *) h;
2249
2250 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2251 it here if it is defined in a non-shared object. */
2252 if (h != NULL
2253 && h->type == STT_GNU_IFUNC
2254 && h->def_regular)
2255 {
2256 asection *gotplt, *base_got;
2257 bfd_vma plt_index;
2258 const char *name;
2259
2260 if ((input_section->flags & SEC_ALLOC) == 0)
2261 {
2262 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2263 STT_GNU_IFUNC symbol as STT_FUNC. */
2264 if (elf_section_type (input_section) == SHT_NOTE)
2265 goto skip_ifunc;
2266 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2267 sections because such sections are not SEC_ALLOC and
2268 thus ld.so will not process them. */
2269 if ((input_section->flags & SEC_DEBUGGING) != 0)
2270 continue;
2271 abort ();
2272 }
2273
2274 /* STT_GNU_IFUNC symbol must go through PLT. */
2275 if (htab->elf.splt != NULL)
2276 {
2277 if (htab->plt_second != NULL)
2278 {
2279 resolved_plt = htab->plt_second;
2280 plt_offset = eh->plt_second.offset;
2281 }
2282 else
2283 {
2284 resolved_plt = htab->elf.splt;
2285 plt_offset = h->plt.offset;
2286 }
2287 gotplt = htab->elf.sgotplt;
2288 }
2289 else
2290 {
2291 resolved_plt = htab->elf.iplt;
2292 plt_offset = h->plt.offset;
2293 gotplt = htab->elf.igotplt;
2294 }
2295
2296 switch (r_type)
2297 {
2298 default:
2299 break;
2300
2301 case R_386_GOT32:
2302 case R_386_GOT32X:
2303 base_got = htab->elf.sgot;
2304 off = h->got.offset;
2305
2306 if (base_got == NULL)
2307 abort ();
2308
2309 if (off == (bfd_vma) -1)
2310 {
2311 /* We can't use h->got.offset here to save state, or
2312 even just remember the offset, as finish_dynamic_symbol
2313 would use that as offset into .got. */
2314
2315 if (h->plt.offset == (bfd_vma) -1)
2316 abort ();
2317
2318 if (htab->elf.splt != NULL)
2319 {
2320 plt_index = (h->plt.offset / plt_entry_size
2321 - htab->plt.has_plt0);
2322 off = (plt_index + 3) * 4;
2323 base_got = htab->elf.sgotplt;
2324 }
2325 else
2326 {
2327 plt_index = h->plt.offset / plt_entry_size;
2328 off = plt_index * 4;
2329 base_got = htab->elf.igotplt;
2330 }
2331
2332 if (h->dynindx == -1
2333 || h->forced_local
2334 || info->symbolic)
2335 {
2336 /* This references the local defitionion. We must
2337 initialize this entry in the global offset table.
2338 Since the offset must always be a multiple of 4,
2339 we use the least significant bit to record
2340 whether we have initialized it already.
2341
2342 When doing a dynamic link, we create a .rela.got
2343 relocation entry to initialize the value. This
2344 is done in the finish_dynamic_symbol routine. */
2345 if ((off & 1) != 0)
2346 off &= ~1;
2347 else
2348 {
2349 bfd_put_32 (output_bfd, relocation,
2350 base_got->contents + off);
2351 h->got.offset |= 1;
2352 }
2353 }
2354
2355 relocation = off;
2356 }
2357 else
2358 relocation = (base_got->output_section->vma
2359 + base_got->output_offset + off
2360 - gotplt->output_section->vma
2361 - gotplt->output_offset);
2362
2363 if (rel->r_offset > 1
2364 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2365 && *(contents + rel->r_offset - 2) != 0x8d)
2366 {
2367 if (bfd_link_pic (info))
2368 goto disallow_got32;
2369
2370 /* Add the GOT base if there is no base register. */
2371 relocation += (gotplt->output_section->vma
2372 + gotplt->output_offset);
2373 }
2374 else if (htab->elf.splt == NULL)
2375 {
2376 /* Adjust for static executables. */
2377 relocation += gotplt->output_offset;
2378 }
2379
2380 goto do_relocation;
2381 }
2382
2383 if (h->plt.offset == (bfd_vma) -1)
2384 {
2385 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2386 if (r_type == R_386_32
2387 && (input_section->flags & SEC_CODE) == 0)
2388 goto do_ifunc_pointer;
2389 goto bad_ifunc_reloc;
2390 }
2391
2392 relocation = (resolved_plt->output_section->vma
2393 + resolved_plt->output_offset + plt_offset);
2394
2395 switch (r_type)
2396 {
2397 default:
2398 bad_ifunc_reloc:
2399 if (h->root.root.string)
2400 name = h->root.root.string;
2401 else
2402 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2403 NULL);
2404 _bfd_error_handler
2405 /* xgettext:c-format */
2406 (_("%pB: relocation %s against STT_GNU_IFUNC "
2407 "symbol `%s' isn't supported"), input_bfd,
2408 howto->name, name);
2409 bfd_set_error (bfd_error_bad_value);
2410 return false;
2411
2412 case R_386_32:
2413 /* Generate dynamic relcoation only when there is a
2414 non-GOT reference in a shared object. */
2415 if ((bfd_link_pic (info) && h->non_got_ref)
2416 || h->plt.offset == (bfd_vma) -1)
2417 {
2418 Elf_Internal_Rela outrel;
2419 asection *sreloc;
2420 bfd_vma offset;
2421
2422 do_ifunc_pointer:
2423 /* Need a dynamic relocation to get the real function
2424 adddress. */
2425 offset = _bfd_elf_section_offset (output_bfd,
2426 info,
2427 input_section,
2428 rel->r_offset);
2429 if (offset == (bfd_vma) -1
2430 || offset == (bfd_vma) -2)
2431 abort ();
2432
2433 outrel.r_offset = (input_section->output_section->vma
2434 + input_section->output_offset
2435 + offset);
2436
2437 if (POINTER_LOCAL_IFUNC_P (info, h))
2438 {
2439 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2440 h->root.root.string,
2441 h->root.u.def.section->owner);
2442
2443 /* This symbol is resolved locally. */
2444 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2445
2446 if (htab->params->report_relative_reloc)
2447 _bfd_x86_elf_link_report_relative_reloc
2448 (info, input_section, h, sym,
2449 "R_386_IRELATIVE", &outrel);
2450
2451 bfd_put_32 (output_bfd,
2452 (h->root.u.def.value
2453 + h->root.u.def.section->output_section->vma
2454 + h->root.u.def.section->output_offset),
2455 contents + offset);
2456 }
2457 else
2458 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2459
2460 /* Dynamic relocations are stored in
2461 1. .rel.ifunc section in PIC object.
2462 2. .rel.got section in dynamic executable.
2463 3. .rel.iplt section in static executable. */
2464 if (bfd_link_pic (info))
2465 sreloc = htab->elf.irelifunc;
2466 else if (htab->elf.splt != NULL)
2467 sreloc = htab->elf.srelgot;
2468 else
2469 sreloc = htab->elf.irelplt;
2470 elf_append_rel (output_bfd, sreloc, &outrel);
2471
2472 /* If this reloc is against an external symbol, we
2473 do not want to fiddle with the addend. Otherwise,
2474 we need to include the symbol value so that it
2475 becomes an addend for the dynamic reloc. For an
2476 internal symbol, we have updated addend. */
2477 continue;
2478 }
2479 /* FALLTHROUGH */
2480 case R_386_PC32:
2481 case R_386_PLT32:
2482 goto do_relocation;
2483
2484 case R_386_GOTOFF:
2485 /* NB: We can't use the PLT entry as the function address
2486 for PIC since the PIC register may not be set up
2487 properly for indirect call. */
2488 if (bfd_link_pic (info))
2489 goto bad_ifunc_reloc;
2490 relocation -= (gotplt->output_section->vma
2491 + gotplt->output_offset);
2492 goto do_relocation;
2493 }
2494 }
2495
2496 skip_ifunc:
2497 resolved_to_zero = (eh != NULL
2498 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2499
2500 switch (r_type)
2501 {
2502 case R_386_GOT32X:
2503 case R_386_GOT32:
2504 /* Relocation is to the entry for this symbol in the global
2505 offset table. */
2506 if (htab->elf.sgot == NULL)
2507 abort ();
2508
2509 relative_reloc = false;
2510 if (h != NULL)
2511 {
2512 off = h->got.offset;
2513 if (RESOLVED_LOCALLY_P (info, h, htab))
2514 {
2515 /* We must initialize this entry in the global offset
2516 table. Since the offset must always be a multiple
2517 of 4, we use the least significant bit to record
2518 whether we have initialized it already.
2519
2520 When doing a dynamic link, we create a .rel.got
2521 relocation entry to initialize the value. This
2522 is done in the finish_dynamic_symbol routine. */
2523 if ((off & 1) != 0)
2524 off &= ~1;
2525 else
2526 {
2527 bfd_put_32 (output_bfd, relocation,
2528 htab->elf.sgot->contents + off);
2529 h->got.offset |= 1;
2530 /* NB: Don't generate relative relocation here if
2531 it has been generated by DT_RELR. */
2532 if (!info->enable_dt_relr
2533 && GENERATE_RELATIVE_RELOC_P (info, h))
2534 {
2535 /* PR ld/21402: If this symbol isn't dynamic
2536 in PIC, generate R_386_RELATIVE here. */
2537 eh->no_finish_dynamic_symbol = 1;
2538 relative_reloc = true;
2539 }
2540 }
2541 }
2542 else
2543 unresolved_reloc = false;
2544 }
2545 else
2546 {
2547 if (local_got_offsets == NULL)
2548 abort ();
2549
2550 off = local_got_offsets[r_symndx];
2551
2552 /* The offset must always be a multiple of 4. We use
2553 the least significant bit to record whether we have
2554 already generated the necessary reloc. */
2555 if ((off & 1) != 0)
2556 off &= ~1;
2557 else
2558 {
2559 bfd_put_32 (output_bfd, relocation,
2560 htab->elf.sgot->contents + off);
2561 local_got_offsets[r_symndx] |= 1;
2562
2563 /* NB: Don't generate relative relocation here if it
2564 has been generated by DT_RELR. */
2565 if (!info->enable_dt_relr && bfd_link_pic (info))
2566 relative_reloc = true;
2567 }
2568 }
2569
2570 if (relative_reloc)
2571 {
2572 asection *s;
2573 Elf_Internal_Rela outrel;
2574
2575 s = htab->elf.srelgot;
2576 if (s == NULL)
2577 abort ();
2578
2579 outrel.r_offset = (htab->elf.sgot->output_section->vma
2580 + htab->elf.sgot->output_offset
2581 + off);
2582 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2583
2584 if (htab->params->report_relative_reloc)
2585 _bfd_x86_elf_link_report_relative_reloc
2586 (info, input_section, h, sym, "R_386_RELATIVE",
2587 &outrel);
2588
2589 elf_append_rel (output_bfd, s, &outrel);
2590 }
2591
2592 if (off >= (bfd_vma) -2)
2593 abort ();
2594
2595 relocation = (htab->elf.sgot->output_section->vma
2596 + htab->elf.sgot->output_offset + off);
2597 if (rel->r_offset > 1
2598 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2599 && *(contents + rel->r_offset - 2) != 0x8d)
2600 {
2601 if (bfd_link_pic (info))
2602 {
2603 /* For PIC, disallow R_386_GOT32 without a base
2604 register, except for "lea foo@GOT, %reg", since
2605 we don't know what the GOT base is. */
2606 const char *name;
2607
2608 disallow_got32:
2609 if (h == NULL || h->root.root.string == NULL)
2610 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2611 NULL);
2612 else
2613 name = h->root.root.string;
2614
2615 _bfd_error_handler
2616 /* xgettext:c-format */
2617 (_("%pB: direct GOT relocation %s against `%s'"
2618 " without base register can not be used"
2619 " when making a shared object"),
2620 input_bfd, howto->name, name);
2621 bfd_set_error (bfd_error_bad_value);
2622 return false;
2623 }
2624 }
2625 else
2626 {
2627 /* Subtract the .got.plt section address only with a base
2628 register. */
2629 relocation -= (htab->elf.sgotplt->output_section->vma
2630 + htab->elf.sgotplt->output_offset);
2631 }
2632
2633 break;
2634
2635 case R_386_GOTOFF:
2636 /* Relocation is relative to the start of the global offset
2637 table. */
2638
2639 /* Check to make sure it isn't a protected function or data
2640 symbol for shared library since it may not be local when
2641 used as function address or with copy relocation. We also
2642 need to make sure that a symbol is referenced locally. */
2643 if (!bfd_link_executable (info) && h)
2644 {
2645 if (!h->def_regular)
2646 {
2647 const char *v;
2648
2649 switch (ELF_ST_VISIBILITY (h->other))
2650 {
2651 case STV_HIDDEN:
2652 v = _("hidden symbol");
2653 break;
2654 case STV_INTERNAL:
2655 v = _("internal symbol");
2656 break;
2657 case STV_PROTECTED:
2658 v = _("protected symbol");
2659 break;
2660 default:
2661 v = _("symbol");
2662 break;
2663 }
2664
2665 _bfd_error_handler
2666 /* xgettext:c-format */
2667 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2668 " `%s' can not be used when making a shared object"),
2669 input_bfd, v, h->root.root.string);
2670 bfd_set_error (bfd_error_bad_value);
2671 return false;
2672 }
2673 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2674 && (h->type == STT_FUNC
2675 || h->type == STT_OBJECT)
2676 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2677 {
2678 _bfd_error_handler
2679 /* xgettext:c-format */
2680 (_("%pB: relocation R_386_GOTOFF against protected %s"
2681 " `%s' can not be used when making a shared object"),
2682 input_bfd,
2683 h->type == STT_FUNC ? "function" : "data",
2684 h->root.root.string);
2685 bfd_set_error (bfd_error_bad_value);
2686 return false;
2687 }
2688 }
2689
2690 /* Note that sgot is not involved in this
2691 calculation. We always want the start of .got.plt. If we
2692 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2693 permitted by the ABI, we might have to change this
2694 calculation. */
2695 relocation -= htab->elf.sgotplt->output_section->vma
2696 + htab->elf.sgotplt->output_offset;
2697 break;
2698
2699 case R_386_GOTPC:
2700 /* Use global offset table as symbol value. */
2701 relocation = htab->elf.sgotplt->output_section->vma
2702 + htab->elf.sgotplt->output_offset;
2703 unresolved_reloc = false;
2704 break;
2705
2706 case R_386_PLT32:
2707 /* Relocation is to the entry for this symbol in the
2708 procedure linkage table. */
2709
2710 /* Resolve a PLT32 reloc against a local symbol directly,
2711 without using the procedure linkage table. */
2712 if (h == NULL)
2713 break;
2714
2715 if ((h->plt.offset == (bfd_vma) -1
2716 && eh->plt_got.offset == (bfd_vma) -1)
2717 || htab->elf.splt == NULL)
2718 {
2719 /* We didn't make a PLT entry for this symbol. This
2720 happens when statically linking PIC code, or when
2721 using -Bsymbolic. */
2722 break;
2723 }
2724
2725 if (h->plt.offset != (bfd_vma) -1)
2726 {
2727 if (htab->plt_second != NULL)
2728 {
2729 resolved_plt = htab->plt_second;
2730 plt_offset = eh->plt_second.offset;
2731 }
2732 else
2733 {
2734 resolved_plt = htab->elf.splt;
2735 plt_offset = h->plt.offset;
2736 }
2737 }
2738 else
2739 {
2740 resolved_plt = htab->plt_got;
2741 plt_offset = eh->plt_got.offset;
2742 }
2743
2744 relocation = (resolved_plt->output_section->vma
2745 + resolved_plt->output_offset
2746 + plt_offset);
2747 unresolved_reloc = false;
2748 break;
2749
2750 case R_386_SIZE32:
2751 /* Set to symbol size. */
2752 relocation = st_size;
2753 /* Fall through. */
2754
2755 case R_386_32:
2756 case R_386_PC32:
2757 if ((input_section->flags & SEC_ALLOC) == 0
2758 || is_vxworks_tls)
2759 break;
2760
2761 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2762 sec, false,
2763 resolved_to_zero,
2764 (r_type == R_386_PC32)))
2765 {
2766 Elf_Internal_Rela outrel;
2767 bool skip, relocate;
2768 bool generate_dynamic_reloc = true;
2769 asection *sreloc;
2770
2771 /* When generating a shared object, these relocations
2772 are copied into the output file to be resolved at run
2773 time. */
2774
2775 skip = false;
2776 relocate = false;
2777
2778 outrel.r_offset =
2779 _bfd_elf_section_offset (output_bfd, info, input_section,
2780 rel->r_offset);
2781 if (outrel.r_offset == (bfd_vma) -1)
2782 skip = true;
2783 else if (outrel.r_offset == (bfd_vma) -2)
2784 skip = true, relocate = true;
2785 outrel.r_offset += (input_section->output_section->vma
2786 + input_section->output_offset);
2787
2788 if (skip)
2789 memset (&outrel, 0, sizeof outrel);
2790 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2791 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2792 else
2793 {
2794 /* This symbol is local, or marked to become local. */
2795 relocate = true;
2796 /* NB: Don't generate relative relocation here if it
2797 has been generated by DT_RELR. */
2798 if (info->enable_dt_relr)
2799 generate_dynamic_reloc = false;
2800 else
2801 {
2802 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2803
2804 if (htab->params->report_relative_reloc)
2805 _bfd_x86_elf_link_report_relative_reloc
2806 (info, input_section, h, sym, "R_386_RELATIVE",
2807 &outrel);
2808 }
2809 }
2810
2811 if (generate_dynamic_reloc)
2812 {
2813 sreloc = elf_section_data (input_section)->sreloc;
2814
2815 if (sreloc == NULL || sreloc->contents == NULL)
2816 {
2817 r = bfd_reloc_notsupported;
2818 goto check_relocation_error;
2819 }
2820
2821 elf_append_rel (output_bfd, sreloc, &outrel);
2822 }
2823
2824 /* If this reloc is against an external symbol, we do
2825 not want to fiddle with the addend. Otherwise, we
2826 need to include the symbol value so that it becomes
2827 an addend for the dynamic reloc. */
2828 if (! relocate)
2829 continue;
2830 }
2831 break;
2832
2833 case R_386_TLS_IE:
2834 if (!bfd_link_executable (info))
2835 {
2836 Elf_Internal_Rela outrel;
2837 asection *sreloc;
2838
2839 outrel.r_offset = rel->r_offset
2840 + input_section->output_section->vma
2841 + input_section->output_offset;
2842 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2843
2844 if (htab->params->report_relative_reloc)
2845 _bfd_x86_elf_link_report_relative_reloc
2846 (info, input_section, h, sym, "R_386_RELATIVE",
2847 &outrel);
2848
2849 sreloc = elf_section_data (input_section)->sreloc;
2850 if (sreloc == NULL)
2851 abort ();
2852 elf_append_rel (output_bfd, sreloc, &outrel);
2853 }
2854 /* Fall through */
2855
2856 case R_386_TLS_GD:
2857 case R_386_TLS_GOTDESC:
2858 case R_386_TLS_DESC_CALL:
2859 case R_386_TLS_IE_32:
2860 case R_386_TLS_GOTIE:
2861 tls_type = GOT_UNKNOWN;
2862 if (h == NULL && local_got_offsets)
2863 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2864 else if (h != NULL)
2865 tls_type = elf_x86_hash_entry(h)->tls_type;
2866 if (tls_type == GOT_TLS_IE)
2867 tls_type = GOT_TLS_IE_NEG;
2868
2869 r_type_tls = r_type;
2870 if (! elf_i386_tls_transition (info, input_bfd,
2871 input_section, contents,
2872 symtab_hdr, sym_hashes,
2873 &r_type_tls, tls_type, rel,
2874 relend, h, r_symndx, true))
2875 return false;
2876
2877 expected_tls_le = htab->elf.target_os == is_solaris
2878 ? R_386_TLS_LE : R_386_TLS_LE_32;
2879 if (r_type_tls == expected_tls_le)
2880 {
2881 /* NB: Solaris only supports R_386_TLS_GD->R_386_TLS_LE. */
2882 BFD_ASSERT (! unresolved_reloc
2883 && (htab->elf.target_os != is_solaris
2884 || (htab->elf.target_os == is_solaris
2885 && (r_type == R_386_TLS_GD
2886 || r_type == R_386_TLS_IE
2887 || r_type == R_386_TLS_GOTIE))));
2888 if (r_type == R_386_TLS_GD)
2889 {
2890 unsigned int type;
2891 bfd_vma roff;
2892
2893 /* GD->LE transition. */
2894 type = *(contents + rel->r_offset - 2);
2895 if (type == 0x04)
2896 {
2897 /* Change
2898 leal foo@tlsgd(,%ebx,1), %eax
2899 call ___tls_get_addr@PLT
2900 into:
2901 movl %gs:0, %eax
2902 subl $foo@tpoff, %eax
2903 (6 byte form of subl). */
2904 roff = rel->r_offset + 5;
2905 }
2906 else
2907 {
2908 /* Change
2909 leal foo@tlsgd(%ebx), %eax
2910 call ___tls_get_addr@PLT
2911 nop
2912 or
2913 leal foo@tlsgd(%reg), %eax
2914 call *___tls_get_addr@GOT(%reg)
2915 which may be converted to
2916 addr32 call ___tls_get_addr
2917 into:
2918 movl %gs:0, %eax; subl $foo@tpoff, %eax
2919 (6 byte form of subl). */
2920 roff = rel->r_offset + 6;
2921 }
2922 memcpy (contents + roff - 8,
2923 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2924 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2925 contents + roff);
2926 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2927 rel++;
2928 wrel++;
2929 continue;
2930 }
2931 else if (r_type == R_386_TLS_GOTDESC)
2932 {
2933 /* GDesc -> LE transition.
2934 It's originally something like:
2935 leal x@tlsdesc(%ebx), %eax
2936
2937 leal x@ntpoff, %eax
2938
2939 Registers other than %eax may be set up here. */
2940
2941 unsigned int val;
2942 bfd_vma roff;
2943
2944 roff = rel->r_offset;
2945 val = bfd_get_8 (input_bfd, contents + roff - 1);
2946
2947 /* Now modify the instruction as appropriate. */
2948 /* aoliva FIXME: remove the above and xor the byte
2949 below with 0x86. */
2950 bfd_put_8 (output_bfd, val ^ 0x86,
2951 contents + roff - 1);
2952 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2953 contents + roff);
2954 continue;
2955 }
2956 else if (r_type == R_386_TLS_DESC_CALL)
2957 {
2958 /* GDesc -> LE transition.
2959 It's originally:
2960 call *(%eax)
2961 Turn it into:
2962 xchg %ax,%ax */
2963
2964 bfd_vma roff;
2965
2966 roff = rel->r_offset;
2967 bfd_put_8 (output_bfd, 0x66, contents + roff);
2968 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2969 continue;
2970 }
2971 else if (r_type == R_386_TLS_IE)
2972 {
2973 unsigned int val;
2974
2975 /* IE->LE transition:
2976 Originally it can be one of:
2977 movl foo, %eax
2978 movl foo, %reg
2979 addl foo, %reg
2980 We change it into:
2981 movl $foo, %eax
2982 movl $foo, %reg
2983 addl $foo, %reg. */
2984 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2985 if (val == 0xa1)
2986 {
2987 /* movl foo, %eax. */
2988 bfd_put_8 (output_bfd, 0xb8,
2989 contents + rel->r_offset - 1);
2990 }
2991 else
2992 {
2993 unsigned int type;
2994
2995 type = bfd_get_8 (input_bfd,
2996 contents + rel->r_offset - 2);
2997 switch (type)
2998 {
2999 case 0x8b:
3000 /* movl */
3001 bfd_put_8 (output_bfd, 0xc7,
3002 contents + rel->r_offset - 2);
3003 bfd_put_8 (output_bfd,
3004 0xc0 | ((val >> 3) & 7),
3005 contents + rel->r_offset - 1);
3006 break;
3007 case 0x03:
3008 /* addl */
3009 bfd_put_8 (output_bfd, 0x81,
3010 contents + rel->r_offset - 2);
3011 bfd_put_8 (output_bfd,
3012 0xc0 | ((val >> 3) & 7),
3013 contents + rel->r_offset - 1);
3014 break;
3015 default:
3016 BFD_FAIL ();
3017 break;
3018 }
3019 }
3020 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3021 contents + rel->r_offset);
3022 continue;
3023 }
3024 else
3025 {
3026 unsigned int val, type;
3027
3028 /* {IE_32,GOTIE}->LE transition:
3029 Originally it can be one of:
3030 subl foo(%reg1), %reg2
3031 movl foo(%reg1), %reg2
3032 addl foo(%reg1), %reg2
3033 We change it into:
3034 subl $foo, %reg2
3035 movl $foo, %reg2 (6 byte form)
3036 addl $foo, %reg2. */
3037 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3038 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3039 if (type == 0x8b)
3040 {
3041 /* movl */
3042 bfd_put_8 (output_bfd, 0xc7,
3043 contents + rel->r_offset - 2);
3044 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3045 contents + rel->r_offset - 1);
3046 }
3047 else if (type == 0x2b)
3048 {
3049 /* subl */
3050 bfd_put_8 (output_bfd, 0x81,
3051 contents + rel->r_offset - 2);
3052 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3053 contents + rel->r_offset - 1);
3054 }
3055 else if (type == 0x03)
3056 {
3057 /* addl */
3058 bfd_put_8 (output_bfd, 0x81,
3059 contents + rel->r_offset - 2);
3060 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3061 contents + rel->r_offset - 1);
3062 }
3063 else
3064 BFD_FAIL ();
3065 if (r_type == R_386_TLS_GOTIE)
3066 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3067 contents + rel->r_offset);
3068 else
3069 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3070 contents + rel->r_offset);
3071 continue;
3072 }
3073 }
3074
3075 if (htab->elf.sgot == NULL)
3076 abort ();
3077
3078 if (h != NULL)
3079 {
3080 off = h->got.offset;
3081 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3082 }
3083 else
3084 {
3085 if (local_got_offsets == NULL)
3086 abort ();
3087
3088 off = local_got_offsets[r_symndx];
3089 offplt = local_tlsdesc_gotents[r_symndx];
3090 }
3091
3092 if ((off & 1) != 0)
3093 off &= ~1;
3094 else
3095 {
3096 Elf_Internal_Rela outrel;
3097 int dr_type;
3098 asection *sreloc;
3099
3100 if (htab->elf.srelgot == NULL)
3101 abort ();
3102
3103 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3104
3105 if (GOT_TLS_GDESC_P (tls_type))
3106 {
3107 bfd_byte *loc;
3108 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3109 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3110 <= htab->elf.sgotplt->size);
3111 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3112 + htab->elf.sgotplt->output_offset
3113 + offplt
3114 + htab->sgotplt_jump_table_size);
3115 sreloc = htab->elf.srelplt;
3116 loc = sreloc->contents;
3117 loc += (htab->next_tls_desc_index++
3118 * sizeof (Elf32_External_Rel));
3119 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3120 <= sreloc->contents + sreloc->size);
3121 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3122 if (indx == 0)
3123 {
3124 BFD_ASSERT (! unresolved_reloc);
3125 bfd_put_32 (output_bfd,
3126 relocation - _bfd_x86_elf_dtpoff_base (info),
3127 htab->elf.sgotplt->contents + offplt
3128 + htab->sgotplt_jump_table_size + 4);
3129 }
3130 else
3131 {
3132 bfd_put_32 (output_bfd, 0,
3133 htab->elf.sgotplt->contents + offplt
3134 + htab->sgotplt_jump_table_size + 4);
3135 }
3136 }
3137
3138 sreloc = htab->elf.srelgot;
3139
3140 outrel.r_offset = (htab->elf.sgot->output_section->vma
3141 + htab->elf.sgot->output_offset + off);
3142
3143 if (GOT_TLS_GD_P (tls_type))
3144 dr_type = R_386_TLS_DTPMOD32;
3145 else if (GOT_TLS_GDESC_P (tls_type))
3146 goto dr_done;
3147 else if (tls_type == GOT_TLS_IE_POS)
3148 dr_type = R_386_TLS_TPOFF;
3149 else
3150 dr_type = R_386_TLS_TPOFF32;
3151
3152 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3153 bfd_put_32 (output_bfd,
3154 relocation - _bfd_x86_elf_dtpoff_base (info),
3155 htab->elf.sgot->contents + off);
3156 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3157 bfd_put_32 (output_bfd,
3158 _bfd_x86_elf_dtpoff_base (info) - relocation,
3159 htab->elf.sgot->contents + off);
3160 else if (dr_type != R_386_TLS_DESC)
3161 bfd_put_32 (output_bfd, 0,
3162 htab->elf.sgot->contents + off);
3163 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3164
3165 elf_append_rel (output_bfd, sreloc, &outrel);
3166
3167 if (GOT_TLS_GD_P (tls_type))
3168 {
3169 if (indx == 0)
3170 {
3171 BFD_ASSERT (! unresolved_reloc);
3172 bfd_put_32 (output_bfd,
3173 relocation - _bfd_x86_elf_dtpoff_base (info),
3174 htab->elf.sgot->contents + off + 4);
3175 }
3176 else
3177 {
3178 bfd_put_32 (output_bfd, 0,
3179 htab->elf.sgot->contents + off + 4);
3180 outrel.r_info = ELF32_R_INFO (indx,
3181 R_386_TLS_DTPOFF32);
3182 outrel.r_offset += 4;
3183 elf_append_rel (output_bfd, sreloc, &outrel);
3184 }
3185 }
3186 else if (tls_type == GOT_TLS_IE_BOTH)
3187 {
3188 bfd_put_32 (output_bfd,
3189 (indx == 0
3190 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3191 : 0),
3192 htab->elf.sgot->contents + off + 4);
3193 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3194 outrel.r_offset += 4;
3195 elf_append_rel (output_bfd, sreloc, &outrel);
3196 }
3197
3198 dr_done:
3199 if (h != NULL)
3200 h->got.offset |= 1;
3201 else
3202 local_got_offsets[r_symndx] |= 1;
3203 }
3204
3205 if (off >= (bfd_vma) -2
3206 && ! GOT_TLS_GDESC_P (tls_type))
3207 abort ();
3208 if (r_type_tls == R_386_TLS_GOTDESC
3209 || r_type_tls == R_386_TLS_DESC_CALL)
3210 {
3211 relocation = htab->sgotplt_jump_table_size + offplt;
3212 unresolved_reloc = false;
3213 }
3214 else if (r_type_tls == r_type)
3215 {
3216 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3217 + htab->elf.sgotplt->output_offset;
3218 relocation = htab->elf.sgot->output_section->vma
3219 + htab->elf.sgot->output_offset + off - g_o_t;
3220 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3221 && tls_type == GOT_TLS_IE_BOTH)
3222 relocation += 4;
3223 if (r_type == R_386_TLS_IE)
3224 relocation += g_o_t;
3225 unresolved_reloc = false;
3226 }
3227 else if (r_type == R_386_TLS_GD)
3228 {
3229 unsigned int val, type;
3230 bfd_vma roff;
3231
3232 /* GD->IE transition. */
3233 type = *(contents + rel->r_offset - 2);
3234 val = *(contents + rel->r_offset - 1);
3235 if (type == 0x04)
3236 {
3237 /* Change
3238 leal foo@tlsgd(,%ebx,1), %eax
3239 call ___tls_get_addr@PLT
3240 into:
3241 movl %gs:0, %eax
3242 subl $foo@gottpoff(%ebx), %eax. */
3243 val >>= 3;
3244 roff = rel->r_offset - 3;
3245 }
3246 else
3247 {
3248 /* Change
3249 leal foo@tlsgd(%ebx), %eax
3250 call ___tls_get_addr@PLT
3251 nop
3252 or
3253 leal foo@tlsgd(%reg), %eax
3254 call *___tls_get_addr@GOT(%reg)
3255 which may be converted to
3256 addr32 call ___tls_get_addr
3257 into:
3258 movl %gs:0, %eax;
3259 subl $foo@gottpoff(%reg), %eax. */
3260 roff = rel->r_offset - 2;
3261 }
3262 memcpy (contents + roff,
3263 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3264 contents[roff + 7] = 0x80 | (val & 7);
3265 /* If foo is used only with foo@gotntpoff(%reg) and
3266 foo@indntpoff, but not with foo@gottpoff(%reg), change
3267 subl $foo@gottpoff(%reg), %eax
3268 into:
3269 addl $foo@gotntpoff(%reg), %eax. */
3270 if (tls_type == GOT_TLS_IE_POS)
3271 contents[roff + 6] = 0x03;
3272 bfd_put_32 (output_bfd,
3273 htab->elf.sgot->output_section->vma
3274 + htab->elf.sgot->output_offset + off
3275 - htab->elf.sgotplt->output_section->vma
3276 - htab->elf.sgotplt->output_offset,
3277 contents + roff + 8);
3278 /* Skip R_386_PLT32 and R_386_GOT32X. */
3279 rel++;
3280 wrel++;
3281 continue;
3282 }
3283 else if (r_type == R_386_TLS_GOTDESC)
3284 {
3285 /* GDesc -> IE transition.
3286 It's originally something like:
3287 leal x@tlsdesc(%ebx), %eax
3288
3289 Change it to:
3290 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3291 or:
3292 movl x@gottpoff(%ebx), %eax # before negl %eax
3293
3294 Registers other than %eax may be set up here. */
3295
3296 bfd_vma roff;
3297
3298 /* First, make sure it's a leal adding ebx to a 32-bit
3299 offset into any register, although it's probably
3300 almost always going to be eax. */
3301 roff = rel->r_offset;
3302
3303 /* Now modify the instruction as appropriate. */
3304 /* To turn a leal into a movl in the form we use it, it
3305 suffices to change the first byte from 0x8d to 0x8b.
3306 aoliva FIXME: should we decide to keep the leal, all
3307 we have to do is remove the statement below, and
3308 adjust the relaxation of R_386_TLS_DESC_CALL. */
3309 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3310
3311 if (tls_type == GOT_TLS_IE_BOTH)
3312 off += 4;
3313
3314 bfd_put_32 (output_bfd,
3315 htab->elf.sgot->output_section->vma
3316 + htab->elf.sgot->output_offset + off
3317 - htab->elf.sgotplt->output_section->vma
3318 - htab->elf.sgotplt->output_offset,
3319 contents + roff);
3320 continue;
3321 }
3322 else if (r_type == R_386_TLS_DESC_CALL)
3323 {
3324 /* GDesc -> IE transition.
3325 It's originally:
3326 call *(%eax)
3327
3328 Change it to:
3329 xchg %ax,%ax
3330 or
3331 negl %eax
3332 depending on how we transformed the TLS_GOTDESC above.
3333 */
3334
3335 bfd_vma roff;
3336
3337 roff = rel->r_offset;
3338
3339 /* Now modify the instruction as appropriate. */
3340 if (tls_type != GOT_TLS_IE_NEG)
3341 {
3342 /* xchg %ax,%ax */
3343 bfd_put_8 (output_bfd, 0x66, contents + roff);
3344 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3345 }
3346 else
3347 {
3348 /* negl %eax */
3349 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3350 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3351 }
3352
3353 continue;
3354 }
3355 else
3356 BFD_ASSERT (false);
3357 break;
3358
3359 case R_386_TLS_LDM:
3360 if (! elf_i386_tls_transition (info, input_bfd,
3361 input_section, contents,
3362 symtab_hdr, sym_hashes,
3363 &r_type, GOT_UNKNOWN, rel,
3364 relend, h, r_symndx, true))
3365 return false;
3366
3367 if (r_type != R_386_TLS_LDM)
3368 {
3369 /* LD->LE transition. Change
3370 leal foo@tlsldm(%ebx) %eax
3371 call ___tls_get_addr@PLT
3372 into:
3373 movl %gs:0, %eax
3374 nop
3375 leal 0(%esi,1), %esi
3376 or change
3377 leal foo@tlsldm(%reg) %eax
3378 call *___tls_get_addr@GOT(%reg)
3379 which may be converted to
3380 addr32 call ___tls_get_addr
3381 into:
3382 movl %gs:0, %eax
3383 leal 0(%esi), %esi */
3384 expected_tls_le = htab->elf.target_os == is_solaris
3385 ? R_386_TLS_LE : R_386_TLS_LE_32;
3386 BFD_ASSERT (r_type == expected_tls_le);
3387 if (*(contents + rel->r_offset + 4) == 0xff
3388 || *(contents + rel->r_offset + 4) == 0x67)
3389 memcpy (contents + rel->r_offset - 2,
3390 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3391 else
3392 memcpy (contents + rel->r_offset - 2,
3393 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3394 /* Skip R_386_PC32/R_386_PLT32. */
3395 rel++;
3396 wrel++;
3397 continue;
3398 }
3399
3400 if (htab->elf.sgot == NULL)
3401 abort ();
3402
3403 off = htab->tls_ld_or_ldm_got.offset;
3404 if (off & 1)
3405 off &= ~1;
3406 else
3407 {
3408 Elf_Internal_Rela outrel;
3409
3410 if (htab->elf.srelgot == NULL)
3411 abort ();
3412
3413 outrel.r_offset = (htab->elf.sgot->output_section->vma
3414 + htab->elf.sgot->output_offset + off);
3415
3416 bfd_put_32 (output_bfd, 0,
3417 htab->elf.sgot->contents + off);
3418 bfd_put_32 (output_bfd, 0,
3419 htab->elf.sgot->contents + off + 4);
3420 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3421 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3422 htab->tls_ld_or_ldm_got.offset |= 1;
3423 }
3424 relocation = htab->elf.sgot->output_section->vma
3425 + htab->elf.sgot->output_offset + off
3426 - htab->elf.sgotplt->output_section->vma
3427 - htab->elf.sgotplt->output_offset;
3428 unresolved_reloc = false;
3429 break;
3430
3431 case R_386_TLS_LDO_32:
3432 if (!bfd_link_executable (info)
3433 || (input_section->flags & SEC_CODE) == 0)
3434 relocation -= _bfd_x86_elf_dtpoff_base (info);
3435 else
3436 /* When converting LDO to LE, we must negate. */
3437 relocation = -elf_i386_tpoff (info, relocation);
3438 break;
3439
3440 case R_386_TLS_LE_32:
3441 case R_386_TLS_LE:
3442 if (!bfd_link_executable (info))
3443 {
3444 Elf_Internal_Rela outrel;
3445 asection *sreloc;
3446
3447 outrel.r_offset = rel->r_offset
3448 + input_section->output_section->vma
3449 + input_section->output_offset;
3450 if (h != NULL && h->dynindx != -1)
3451 indx = h->dynindx;
3452 else
3453 indx = 0;
3454 if (r_type == R_386_TLS_LE_32)
3455 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3456 else
3457 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3458 sreloc = elf_section_data (input_section)->sreloc;
3459 if (sreloc == NULL)
3460 abort ();
3461 elf_append_rel (output_bfd, sreloc, &outrel);
3462 if (indx)
3463 continue;
3464 else if (r_type == R_386_TLS_LE_32)
3465 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3466 else
3467 relocation -= _bfd_x86_elf_dtpoff_base (info);
3468 }
3469 else if (r_type == R_386_TLS_LE_32)
3470 relocation = elf_i386_tpoff (info, relocation);
3471 else
3472 relocation = -elf_i386_tpoff (info, relocation);
3473 break;
3474
3475 default:
3476 break;
3477 }
3478
3479 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3480 because such sections are not SEC_ALLOC and thus ld.so will
3481 not process them. */
3482 if (unresolved_reloc
3483 && !((input_section->flags & SEC_DEBUGGING) != 0
3484 && h->def_dynamic)
3485 && _bfd_elf_section_offset (output_bfd, info, input_section,
3486 rel->r_offset) != (bfd_vma) -1)
3487 {
3488 _bfd_error_handler
3489 /* xgettext:c-format */
3490 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3491 input_bfd,
3492 input_section,
3493 (uint64_t) rel->r_offset,
3494 howto->name,
3495 h->root.root.string);
3496 return false;
3497 }
3498
3499 do_relocation:
3500 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3501 contents, rel->r_offset,
3502 relocation, 0);
3503
3504 check_relocation_error:
3505 if (r != bfd_reloc_ok)
3506 {
3507 const char *name;
3508
3509 if (h != NULL)
3510 name = h->root.root.string;
3511 else
3512 {
3513 name = bfd_elf_string_from_elf_section (input_bfd,
3514 symtab_hdr->sh_link,
3515 sym->st_name);
3516 if (name == NULL)
3517 return false;
3518 if (*name == '\0')
3519 name = bfd_section_name (sec);
3520 }
3521
3522 if (r == bfd_reloc_overflow)
3523 (*info->callbacks->reloc_overflow)
3524 (info, (h ? &h->root : NULL), name, howto->name,
3525 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3526 else
3527 {
3528 _bfd_error_handler
3529 /* xgettext:c-format */
3530 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3531 input_bfd, input_section,
3532 (uint64_t) rel->r_offset, name, (int) r);
3533 return false;
3534 }
3535 }
3536
3537 if (wrel != rel)
3538 *wrel = *rel;
3539 }
3540
3541 if (wrel != rel)
3542 {
3543 Elf_Internal_Shdr *rel_hdr;
3544 size_t deleted = rel - wrel;
3545
3546 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3547 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3548 if (rel_hdr->sh_size == 0)
3549 {
3550 /* It is too late to remove an empty reloc section. Leave
3551 one NONE reloc.
3552 ??? What is wrong with an empty section??? */
3553 rel_hdr->sh_size = rel_hdr->sh_entsize;
3554 deleted -= 1;
3555 }
3556 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3557 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3558 input_section->reloc_count -= deleted;
3559 }
3560
3561 return true;
3562 }
3563
3564 /* Finish up dynamic symbol handling. We set the contents of various
3565 dynamic sections here. */
3566
3567 static bool
3568 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3569 struct bfd_link_info *info,
3570 struct elf_link_hash_entry *h,
3571 Elf_Internal_Sym *sym)
3572 {
3573 struct elf_x86_link_hash_table *htab;
3574 unsigned plt_entry_size;
3575 struct elf_x86_link_hash_entry *eh;
3576 bool local_undefweak;
3577 bool use_plt_second;
3578
3579 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3580 if (htab == NULL)
3581 return false;
3582
3583 plt_entry_size = htab->plt.plt_entry_size;
3584
3585 /* Use the second PLT section only if there is .plt section. */
3586 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3587
3588 eh = (struct elf_x86_link_hash_entry *) h;
3589 if (eh->no_finish_dynamic_symbol)
3590 abort ();
3591
3592 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3593 resolved undefined weak symbols in executable so that their
3594 references have value 0 at run-time. */
3595 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3596
3597 if (h->plt.offset != (bfd_vma) -1)
3598 {
3599 bfd_vma plt_index, plt_offset;
3600 bfd_vma got_offset;
3601 Elf_Internal_Rela rel;
3602 bfd_byte *loc;
3603 asection *plt, *resolved_plt, *gotplt, *relplt;
3604
3605 /* When building a static executable, use .iplt, .igot.plt and
3606 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3607 if (htab->elf.splt != NULL)
3608 {
3609 plt = htab->elf.splt;
3610 gotplt = htab->elf.sgotplt;
3611 relplt = htab->elf.srelplt;
3612 }
3613 else
3614 {
3615 plt = htab->elf.iplt;
3616 gotplt = htab->elf.igotplt;
3617 relplt = htab->elf.irelplt;
3618 }
3619
3620 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3621
3622 /* Get the index in the procedure linkage table which
3623 corresponds to this symbol. This is the index of this symbol
3624 in all the symbols for which we are making plt entries. The
3625 first entry in the procedure linkage table is reserved.
3626
3627 Get the offset into the .got table of the entry that
3628 corresponds to this function. Each .got entry is 4 bytes.
3629 The first three are reserved.
3630
3631 For static executables, we don't reserve anything. */
3632
3633 if (plt == htab->elf.splt)
3634 {
3635 got_offset = (h->plt.offset / plt_entry_size
3636 - htab->plt.has_plt0);
3637 got_offset = (got_offset + 3) * 4;
3638 }
3639 else
3640 {
3641 got_offset = h->plt.offset / plt_entry_size;
3642 got_offset = got_offset * 4;
3643 }
3644
3645 /* Fill in the entry in the procedure linkage table and update
3646 the first slot. */
3647 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3648 plt_entry_size);
3649
3650 if (use_plt_second)
3651 {
3652 const bfd_byte *plt_entry;
3653 if (bfd_link_pic (info))
3654 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3655 else
3656 plt_entry = htab->non_lazy_plt->plt_entry;
3657 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3658 plt_entry, htab->non_lazy_plt->plt_entry_size);
3659
3660 resolved_plt = htab->plt_second;
3661 plt_offset = eh->plt_second.offset;
3662 }
3663 else
3664 {
3665 resolved_plt = plt;
3666 plt_offset = h->plt.offset;
3667 }
3668
3669 if (! bfd_link_pic (info))
3670 {
3671 bfd_put_32 (output_bfd,
3672 (gotplt->output_section->vma
3673 + gotplt->output_offset
3674 + got_offset),
3675 resolved_plt->contents + plt_offset
3676 + htab->plt.plt_got_offset);
3677
3678 if (htab->elf.target_os == is_vxworks)
3679 {
3680 int s, k, reloc_index;
3681
3682 /* Create the R_386_32 relocation referencing the GOT
3683 for this PLT entry. */
3684
3685 /* S: Current slot number (zero-based). */
3686 s = ((h->plt.offset - htab->plt.plt_entry_size)
3687 / htab->plt.plt_entry_size);
3688 /* K: Number of relocations for PLTResolve. */
3689 if (bfd_link_pic (info))
3690 k = PLTRESOLVE_RELOCS_SHLIB;
3691 else
3692 k = PLTRESOLVE_RELOCS;
3693 /* Skip the PLTresolve relocations, and the relocations for
3694 the other PLT slots. */
3695 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3696 loc = (htab->srelplt2->contents + reloc_index
3697 * sizeof (Elf32_External_Rel));
3698
3699 rel.r_offset = (plt->output_section->vma
3700 + plt->output_offset
3701 + h->plt.offset + 2),
3702 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3703 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3704
3705 /* Create the R_386_32 relocation referencing the beginning of
3706 the PLT for this GOT entry. */
3707 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3708 + htab->elf.sgotplt->output_offset
3709 + got_offset);
3710 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3711 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3712 loc + sizeof (Elf32_External_Rel));
3713 }
3714 }
3715 else
3716 {
3717 bfd_put_32 (output_bfd, got_offset,
3718 resolved_plt->contents + plt_offset
3719 + htab->plt.plt_got_offset);
3720 }
3721
3722 /* Fill in the entry in the global offset table. Leave the entry
3723 as zero for undefined weak symbol in PIE. No PLT relocation
3724 against undefined weak symbol in PIE. */
3725 if (!local_undefweak)
3726 {
3727 if (htab->plt.has_plt0)
3728 bfd_put_32 (output_bfd,
3729 (plt->output_section->vma
3730 + plt->output_offset
3731 + h->plt.offset
3732 + htab->lazy_plt->plt_lazy_offset),
3733 gotplt->contents + got_offset);
3734
3735 /* Fill in the entry in the .rel.plt section. */
3736 rel.r_offset = (gotplt->output_section->vma
3737 + gotplt->output_offset
3738 + got_offset);
3739 if (PLT_LOCAL_IFUNC_P (info, h))
3740 {
3741 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3742 h->root.root.string,
3743 h->root.u.def.section->owner);
3744
3745 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3746 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3747 in the .got.plt section. */
3748 bfd_put_32 (output_bfd,
3749 (h->root.u.def.value
3750 + h->root.u.def.section->output_section->vma
3751 + h->root.u.def.section->output_offset),
3752 gotplt->contents + got_offset);
3753 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3754
3755 if (htab->params->report_relative_reloc)
3756 _bfd_x86_elf_link_report_relative_reloc
3757 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3758
3759 /* R_386_IRELATIVE comes last. */
3760 plt_index = htab->next_irelative_index--;
3761 }
3762 else
3763 {
3764 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3765 plt_index = htab->next_jump_slot_index++;
3766 }
3767
3768 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3769 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3770
3771 /* Don't fill the second and third slots in PLT entry for
3772 static executables nor without PLT0. */
3773 if (plt == htab->elf.splt && htab->plt.has_plt0)
3774 {
3775 bfd_put_32 (output_bfd,
3776 plt_index * sizeof (Elf32_External_Rel),
3777 plt->contents + h->plt.offset
3778 + htab->lazy_plt->plt_reloc_offset);
3779 bfd_put_32 (output_bfd,
3780 - (h->plt.offset
3781 + htab->lazy_plt->plt_plt_offset + 4),
3782 (plt->contents + h->plt.offset
3783 + htab->lazy_plt->plt_plt_offset));
3784 }
3785 }
3786 }
3787 else if (eh->plt_got.offset != (bfd_vma) -1)
3788 {
3789 bfd_vma got_offset, plt_offset;
3790 asection *plt, *got, *gotplt;
3791 const bfd_byte *got_plt_entry;
3792
3793 /* Set the entry in the GOT procedure linkage table. */
3794 plt = htab->plt_got;
3795 got = htab->elf.sgot;
3796 gotplt = htab->elf.sgotplt;
3797 got_offset = h->got.offset;
3798
3799 if (got_offset == (bfd_vma) -1
3800 || plt == NULL
3801 || got == NULL
3802 || gotplt == NULL)
3803 abort ();
3804
3805 /* Fill in the entry in the GOT procedure linkage table. */
3806 if (! bfd_link_pic (info))
3807 {
3808 got_plt_entry = htab->non_lazy_plt->plt_entry;
3809 got_offset += got->output_section->vma + got->output_offset;
3810 }
3811 else
3812 {
3813 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3814 got_offset += (got->output_section->vma
3815 + got->output_offset
3816 - gotplt->output_section->vma
3817 - gotplt->output_offset);
3818 }
3819
3820 plt_offset = eh->plt_got.offset;
3821 memcpy (plt->contents + plt_offset, got_plt_entry,
3822 htab->non_lazy_plt->plt_entry_size);
3823 bfd_put_32 (output_bfd, got_offset,
3824 (plt->contents + plt_offset
3825 + htab->non_lazy_plt->plt_got_offset));
3826 }
3827
3828 if (!local_undefweak
3829 && !h->def_regular
3830 && (h->plt.offset != (bfd_vma) -1
3831 || eh->plt_got.offset != (bfd_vma) -1))
3832 {
3833 /* Mark the symbol as undefined, rather than as defined in
3834 the .plt section. Leave the value if there were any
3835 relocations where pointer equality matters (this is a clue
3836 for the dynamic linker, to make function pointer
3837 comparisons work between an application and shared
3838 library), otherwise set it to zero. If a function is only
3839 called from a binary, there is no need to slow down
3840 shared libraries because of that. */
3841 sym->st_shndx = SHN_UNDEF;
3842 if (!h->pointer_equality_needed)
3843 sym->st_value = 0;
3844 }
3845
3846 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3847
3848 /* Don't generate dynamic GOT relocation against undefined weak
3849 symbol in executable. */
3850 if (h->got.offset != (bfd_vma) -1
3851 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3852 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3853 && !local_undefweak)
3854 {
3855 Elf_Internal_Rela rel;
3856 asection *relgot = htab->elf.srelgot;
3857 const char *relative_reloc_name = NULL;
3858 bool generate_dynamic_reloc = true;
3859
3860 /* This symbol has an entry in the global offset table. Set it
3861 up. */
3862
3863 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3864 abort ();
3865
3866 rel.r_offset = (htab->elf.sgot->output_section->vma
3867 + htab->elf.sgot->output_offset
3868 + (h->got.offset & ~(bfd_vma) 1));
3869
3870 /* If this is a static link, or it is a -Bsymbolic link and the
3871 symbol is defined locally or was forced to be local because
3872 of a version file, we just want to emit a RELATIVE reloc.
3873 The entry in the global offset table will already have been
3874 initialized in the relocate_section function. */
3875 if (h->def_regular
3876 && h->type == STT_GNU_IFUNC)
3877 {
3878 if (h->plt.offset == (bfd_vma) -1)
3879 {
3880 /* STT_GNU_IFUNC is referenced without PLT. */
3881 if (htab->elf.splt == NULL)
3882 {
3883 /* use .rel[a].iplt section to store .got relocations
3884 in static executable. */
3885 relgot = htab->elf.irelplt;
3886 }
3887 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3888 {
3889 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3890 h->root.root.string,
3891 h->root.u.def.section->owner);
3892
3893 bfd_put_32 (output_bfd,
3894 (h->root.u.def.value
3895 + h->root.u.def.section->output_section->vma
3896 + h->root.u.def.section->output_offset),
3897 htab->elf.sgot->contents + h->got.offset);
3898 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3899 relative_reloc_name = "R_386_IRELATIVE";
3900 }
3901 else
3902 goto do_glob_dat;
3903 }
3904 else if (bfd_link_pic (info))
3905 {
3906 /* Generate R_386_GLOB_DAT. */
3907 goto do_glob_dat;
3908 }
3909 else
3910 {
3911 asection *plt;
3912 bfd_vma plt_offset;
3913
3914 if (!h->pointer_equality_needed)
3915 abort ();
3916
3917 /* For non-shared object, we can't use .got.plt, which
3918 contains the real function addres if we need pointer
3919 equality. We load the GOT entry with the PLT entry. */
3920 if (htab->plt_second != NULL)
3921 {
3922 plt = htab->plt_second;
3923 plt_offset = eh->plt_second.offset;
3924 }
3925 else
3926 {
3927 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3928 plt_offset = h->plt.offset;
3929 }
3930 bfd_put_32 (output_bfd,
3931 (plt->output_section->vma
3932 + plt->output_offset + plt_offset),
3933 htab->elf.sgot->contents + h->got.offset);
3934 return true;
3935 }
3936 }
3937 else if (bfd_link_pic (info)
3938 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3939 {
3940 BFD_ASSERT((h->got.offset & 1) != 0);
3941 if (info->enable_dt_relr)
3942 generate_dynamic_reloc = false;
3943 else
3944 {
3945 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3946 relative_reloc_name = "R_386_RELATIVE";
3947 }
3948 }
3949 else
3950 {
3951 BFD_ASSERT((h->got.offset & 1) == 0);
3952 do_glob_dat:
3953 bfd_put_32 (output_bfd, (bfd_vma) 0,
3954 htab->elf.sgot->contents + h->got.offset);
3955 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3956 }
3957
3958 if (generate_dynamic_reloc)
3959 {
3960 if (relative_reloc_name != NULL
3961 && htab->params->report_relative_reloc)
3962 _bfd_x86_elf_link_report_relative_reloc
3963 (info, relgot, h, sym, relative_reloc_name, &rel);
3964
3965 elf_append_rel (output_bfd, relgot, &rel);
3966 }
3967 }
3968
3969 if (h->needs_copy)
3970 {
3971 Elf_Internal_Rela rel;
3972 asection *s;
3973
3974 /* This symbol needs a copy reloc. Set it up. */
3975 VERIFY_COPY_RELOC (h, htab)
3976
3977 rel.r_offset = (h->root.u.def.value
3978 + h->root.u.def.section->output_section->vma
3979 + h->root.u.def.section->output_offset);
3980 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3981 if (h->root.u.def.section == htab->elf.sdynrelro)
3982 s = htab->elf.sreldynrelro;
3983 else
3984 s = htab->elf.srelbss;
3985 elf_append_rel (output_bfd, s, &rel);
3986 }
3987
3988 return true;
3989 }
3990
3991 /* Finish up local dynamic symbol handling. We set the contents of
3992 various dynamic sections here. */
3993
3994 static int
3995 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3996 {
3997 struct elf_link_hash_entry *h
3998 = (struct elf_link_hash_entry *) *slot;
3999 struct bfd_link_info *info
4000 = (struct bfd_link_info *) inf;
4001
4002 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4003 h, NULL);
4004 }
4005
4006 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4007 here since undefined weak symbol may not be dynamic and may not be
4008 called for elf_i386_finish_dynamic_symbol. */
4009
4010 static bool
4011 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4012 void *inf)
4013 {
4014 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4015 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4016
4017 if (h->root.type != bfd_link_hash_undefweak
4018 || h->dynindx != -1)
4019 return true;
4020
4021 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4022 info, h, NULL);
4023 }
4024
4025 /* Used to decide how to sort relocs in an optimal manner for the
4026 dynamic linker, before writing them out. */
4027
4028 static enum elf_reloc_type_class
4029 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4030 const asection *rel_sec ATTRIBUTE_UNUSED,
4031 const Elf_Internal_Rela *rela)
4032 {
4033 bfd *abfd = info->output_bfd;
4034 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4035 struct elf_link_hash_table *htab = elf_hash_table (info);
4036
4037 if (htab->dynsym != NULL
4038 && htab->dynsym->contents != NULL)
4039 {
4040 /* Check relocation against STT_GNU_IFUNC symbol if there are
4041 dynamic symbols. */
4042 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4043 if (r_symndx != STN_UNDEF)
4044 {
4045 Elf_Internal_Sym sym;
4046 if (!bed->s->swap_symbol_in (abfd,
4047 (htab->dynsym->contents
4048 + r_symndx * sizeof (Elf32_External_Sym)),
4049 0, &sym))
4050 abort ();
4051
4052 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4053 return reloc_class_ifunc;
4054 }
4055 }
4056
4057 switch (ELF32_R_TYPE (rela->r_info))
4058 {
4059 case R_386_IRELATIVE:
4060 return reloc_class_ifunc;
4061 case R_386_RELATIVE:
4062 return reloc_class_relative;
4063 case R_386_JUMP_SLOT:
4064 return reloc_class_plt;
4065 case R_386_COPY:
4066 return reloc_class_copy;
4067 default:
4068 return reloc_class_normal;
4069 }
4070 }
4071
4072 /* Finish up the dynamic sections. */
4073
4074 static bool
4075 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4076 struct bfd_link_info *info)
4077 {
4078 struct elf_x86_link_hash_table *htab;
4079
4080 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4081 if (htab == NULL)
4082 return false;
4083
4084 if (!htab->elf.dynamic_sections_created)
4085 return true;
4086
4087 if (htab->elf.splt && htab->elf.splt->size > 0)
4088 {
4089 if (bfd_is_abs_section (htab->elf.splt->output_section))
4090 {
4091 info->callbacks->einfo
4092 (_("%F%P: discarded output section: `%pA'\n"),
4093 htab->elf.splt);
4094 return false;
4095 }
4096
4097 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4098 really seem like the right value. */
4099 elf_section_data (htab->elf.splt->output_section)
4100 ->this_hdr.sh_entsize = 4;
4101
4102 if (htab->plt.has_plt0)
4103 {
4104 /* Fill in the special first entry in the procedure linkage
4105 table. */
4106 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4107 htab->lazy_plt->plt0_entry_size);
4108 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4109 htab->plt0_pad_byte,
4110 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4111 if (!bfd_link_pic (info))
4112 {
4113 bfd_put_32 (output_bfd,
4114 (htab->elf.sgotplt->output_section->vma
4115 + htab->elf.sgotplt->output_offset
4116 + 4),
4117 htab->elf.splt->contents
4118 + htab->lazy_plt->plt0_got1_offset);
4119 bfd_put_32 (output_bfd,
4120 (htab->elf.sgotplt->output_section->vma
4121 + htab->elf.sgotplt->output_offset
4122 + 8),
4123 htab->elf.splt->contents
4124 + htab->lazy_plt->plt0_got2_offset);
4125
4126 if (htab->elf.target_os == is_vxworks)
4127 {
4128 Elf_Internal_Rela rel;
4129 int num_plts = (htab->elf.splt->size
4130 / htab->plt.plt_entry_size) - 1;
4131 unsigned char *p;
4132 asection *srelplt2 = htab->srelplt2;
4133
4134 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4135 + 4. On IA32 we use REL relocations so the
4136 addend goes in the PLT directly. */
4137 rel.r_offset = (htab->elf.splt->output_section->vma
4138 + htab->elf.splt->output_offset
4139 + htab->lazy_plt->plt0_got1_offset);
4140 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4141 R_386_32);
4142 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4143 srelplt2->contents);
4144 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4145 + 8. */
4146 rel.r_offset = (htab->elf.splt->output_section->vma
4147 + htab->elf.splt->output_offset
4148 + htab->lazy_plt->plt0_got2_offset);
4149 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4150 R_386_32);
4151 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4152 srelplt2->contents +
4153 sizeof (Elf32_External_Rel));
4154 /* Correct the .rel.plt.unloaded relocations. */
4155 p = srelplt2->contents;
4156 if (bfd_link_pic (info))
4157 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4158 else
4159 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4160
4161 for (; num_plts; num_plts--)
4162 {
4163 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4164 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4165 R_386_32);
4166 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4167 p += sizeof (Elf32_External_Rel);
4168
4169 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4170 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4171 R_386_32);
4172 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4173 p += sizeof (Elf32_External_Rel);
4174 }
4175 }
4176 }
4177 }
4178 }
4179
4180 /* Fill PLT entries for undefined weak symbols in PIE. */
4181 if (bfd_link_pie (info))
4182 bfd_hash_traverse (&info->hash->table,
4183 elf_i386_pie_finish_undefweak_symbol,
4184 info);
4185
4186 return true;
4187 }
4188
4189 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4190 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4191 It has to be done before elf_link_sort_relocs is called so that
4192 dynamic relocations are properly sorted. */
4193
4194 static bool
4195 elf_i386_output_arch_local_syms
4196 (bfd *output_bfd ATTRIBUTE_UNUSED,
4197 struct bfd_link_info *info,
4198 void *flaginfo ATTRIBUTE_UNUSED,
4199 int (*func) (void *, const char *,
4200 Elf_Internal_Sym *,
4201 asection *,
4202 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4203 {
4204 struct elf_x86_link_hash_table *htab
4205 = elf_x86_hash_table (info, I386_ELF_DATA);
4206 if (htab == NULL)
4207 return false;
4208
4209 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4210 htab_traverse (htab->loc_hash_table,
4211 elf_i386_finish_local_dynamic_symbol,
4212 info);
4213
4214 return true;
4215 }
4216
4217 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4218 dynamic relocations. */
4219
4220 static long
4221 elf_i386_get_synthetic_symtab (bfd *abfd,
4222 long symcount ATTRIBUTE_UNUSED,
4223 asymbol **syms ATTRIBUTE_UNUSED,
4224 long dynsymcount,
4225 asymbol **dynsyms,
4226 asymbol **ret)
4227 {
4228 long count, i, n;
4229 int j;
4230 bfd_byte *plt_contents;
4231 long relsize;
4232 const struct elf_x86_lazy_plt_layout *lazy_plt;
4233 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4234 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4235 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4236 asection *plt;
4237 bfd_vma got_addr;
4238 enum elf_x86_plt_type plt_type;
4239 struct elf_x86_plt plts[] =
4240 {
4241 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4242 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4243 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4244 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4245 };
4246
4247 *ret = NULL;
4248
4249 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4250 return 0;
4251
4252 if (dynsymcount <= 0)
4253 return 0;
4254
4255 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4256 if (relsize <= 0)
4257 return -1;
4258
4259 non_lazy_plt = NULL;
4260 /* Silence GCC 6. */
4261 lazy_plt = NULL;
4262 non_lazy_ibt_plt = NULL;
4263 lazy_ibt_plt = NULL;
4264 switch (get_elf_backend_data (abfd)->target_os)
4265 {
4266 case is_normal:
4267 case is_solaris:
4268 non_lazy_plt = &elf_i386_non_lazy_plt;
4269 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4270 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4271 /* Fall through */
4272 case is_vxworks:
4273 lazy_plt = &elf_i386_lazy_plt;
4274 break;
4275 default:
4276 abort ();
4277 }
4278
4279 got_addr = 0;
4280
4281 count = 0;
4282 for (j = 0; plts[j].name != NULL; j++)
4283 {
4284 plt = bfd_get_section_by_name (abfd, plts[j].name);
4285 if (plt == NULL || plt->size == 0)
4286 continue;
4287
4288 /* Get the PLT section contents. */
4289 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4290 if (plt_contents == NULL)
4291 break;
4292 if (!bfd_get_section_contents (abfd, (asection *) plt,
4293 plt_contents, 0, plt->size))
4294 {
4295 free (plt_contents);
4296 break;
4297 }
4298
4299 /* Check what kind of PLT it is. */
4300 plt_type = plt_unknown;
4301 if (plts[j].type == plt_unknown
4302 && (plt->size >= (lazy_plt->plt0_entry_size
4303 + lazy_plt->plt_entry_size)))
4304 {
4305 /* Match lazy PLT first. */
4306 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4307 lazy_plt->plt0_got1_offset) == 0)
4308 {
4309 /* The fist entry in the lazy IBT PLT is the same as the
4310 normal lazy PLT. */
4311 if (lazy_ibt_plt != NULL
4312 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4313 lazy_ibt_plt->plt_entry,
4314 lazy_ibt_plt->plt_got_offset) == 0))
4315 plt_type = plt_lazy | plt_second;
4316 else
4317 plt_type = plt_lazy;
4318 }
4319 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4320 lazy_plt->plt0_got1_offset) == 0)
4321 {
4322 /* The fist entry in the PIC lazy IBT PLT is the same as
4323 the normal PIC lazy PLT. */
4324 if (lazy_ibt_plt != NULL
4325 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4326 lazy_ibt_plt->pic_plt_entry,
4327 lazy_ibt_plt->plt_got_offset) == 0))
4328 plt_type = plt_lazy | plt_pic | plt_second;
4329 else
4330 plt_type = plt_lazy | plt_pic;
4331 }
4332 }
4333
4334 if (non_lazy_plt != NULL
4335 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4336 && plt->size >= non_lazy_plt->plt_entry_size)
4337 {
4338 /* Match non-lazy PLT. */
4339 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4340 non_lazy_plt->plt_got_offset) == 0)
4341 plt_type = plt_non_lazy;
4342 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4343 non_lazy_plt->plt_got_offset) == 0)
4344 plt_type = plt_pic;
4345 }
4346
4347 if ((non_lazy_ibt_plt != NULL)
4348 && (plt_type == plt_unknown || plt_type == plt_second)
4349 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4350 {
4351 if (memcmp (plt_contents,
4352 non_lazy_ibt_plt->plt_entry,
4353 non_lazy_ibt_plt->plt_got_offset) == 0)
4354 {
4355 /* Match IBT PLT. */
4356 plt_type = plt_second;
4357 non_lazy_plt = non_lazy_ibt_plt;
4358 }
4359 else if (memcmp (plt_contents,
4360 non_lazy_ibt_plt->pic_plt_entry,
4361 non_lazy_ibt_plt->plt_got_offset) == 0)
4362 {
4363 /* Match PIC IBT PLT. */
4364 plt_type = plt_second | plt_pic;
4365 non_lazy_plt = non_lazy_ibt_plt;
4366 }
4367 }
4368
4369 if (plt_type == plt_unknown)
4370 {
4371 free (plt_contents);
4372 continue;
4373 }
4374
4375 plts[j].sec = plt;
4376 plts[j].type = plt_type;
4377
4378 if ((plt_type & plt_lazy))
4379 {
4380 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4381 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4382 /* Skip PLT0 in lazy PLT. */
4383 i = 1;
4384 }
4385 else
4386 {
4387 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4388 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4389 i = 0;
4390 }
4391
4392 /* Skip lazy PLT when the second PLT is used. */
4393 if ((plt_type & (plt_lazy | plt_second))
4394 == (plt_lazy | plt_second))
4395 plts[j].count = 0;
4396 else
4397 {
4398 n = plt->size / plts[j].plt_entry_size;
4399 plts[j].count = n;
4400 count += n - i;
4401 }
4402
4403 plts[j].contents = plt_contents;
4404
4405 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4406 if ((plt_type & plt_pic))
4407 got_addr = (bfd_vma) -1;
4408 }
4409
4410 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4411 got_addr, plts, dynsyms,
4412 ret);
4413 }
4414
4415 /* Set up i386 GNU properties. Return the first relocatable ELF input
4416 with GNU properties if found. Otherwise, return NULL. */
4417
4418 static bfd *
4419 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4420 {
4421 struct elf_x86_init_table init_table;
4422
4423 switch (get_elf_backend_data (info->output_bfd)->target_os)
4424 {
4425 case is_normal:
4426 case is_solaris:
4427 init_table.plt0_pad_byte = 0x0;
4428 init_table.lazy_plt = &elf_i386_lazy_plt;
4429 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4430 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4431 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4432 break;
4433 case is_vxworks:
4434 init_table.plt0_pad_byte = 0x90;
4435 init_table.lazy_plt = &elf_i386_lazy_plt;
4436 init_table.non_lazy_plt = NULL;
4437 init_table.lazy_ibt_plt = NULL;
4438 init_table.non_lazy_ibt_plt = NULL;
4439 break;
4440 default:
4441 abort ();
4442 }
4443
4444 init_table.r_info = elf32_r_info;
4445 init_table.r_sym = elf32_r_sym;
4446
4447 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4448 }
4449
4450 #define TARGET_LITTLE_SYM i386_elf32_vec
4451 #define TARGET_LITTLE_NAME "elf32-i386"
4452 #define ELF_ARCH bfd_arch_i386
4453 #define ELF_TARGET_ID I386_ELF_DATA
4454 #define ELF_MACHINE_CODE EM_386
4455 #define ELF_MAXPAGESIZE 0x1000
4456
4457 #define elf_backend_can_gc_sections 1
4458 #define elf_backend_can_refcount 1
4459 #define elf_backend_want_got_plt 1
4460 #define elf_backend_plt_readonly 1
4461 #define elf_backend_want_plt_sym 0
4462 #define elf_backend_got_header_size 12
4463 #define elf_backend_plt_alignment 4
4464 #define elf_backend_dtrel_excludes_plt 1
4465 #define elf_backend_caches_rawsize 1
4466 #define elf_backend_want_dynrelro 1
4467
4468 /* Support RELA for objdump of prelink objects. */
4469 #define elf_info_to_howto elf_i386_info_to_howto_rel
4470 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4471
4472 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4473 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4474 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4475 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4476
4477 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4478 #define elf_backend_always_size_sections elf_i386_always_size_sections
4479 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4480 #define elf_backend_fake_sections elf_i386_fake_sections
4481 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4482 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4483 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4484 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4485 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4486 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4487 #define elf_backend_relocate_section elf_i386_relocate_section
4488 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4489 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4490
4491 #define elf_backend_linux_prpsinfo32_ugid16 true
4492
4493 #define elf32_bed elf32_i386_bed
4494
4495 #include "elf32-target.h"
4496
4497 /* FreeBSD support. */
4498
4499 #undef TARGET_LITTLE_SYM
4500 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4501 #undef TARGET_LITTLE_NAME
4502 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4503 #undef ELF_OSABI
4504 #define ELF_OSABI ELFOSABI_FREEBSD
4505
4506 /* The kernel recognizes executables as valid only if they carry a
4507 "FreeBSD" label in the ELF header. So we put this label on all
4508 executables and (for simplicity) also all other object files. */
4509
4510 static bool
4511 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4512 {
4513 if (!_bfd_elf_init_file_header (abfd, info))
4514 return false;
4515
4516 #ifdef OLD_FREEBSD_ABI_LABEL
4517 {
4518 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4519 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4520 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4521 }
4522 #endif
4523 return true;
4524 }
4525
4526 #undef elf_backend_init_file_header
4527 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4528 #undef elf32_bed
4529 #define elf32_bed elf32_i386_fbsd_bed
4530
4531 #undef elf_backend_add_symbol_hook
4532
4533 #include "elf32-target.h"
4534
4535 #undef elf_backend_init_file_header
4536
4537 /* Solaris 2. */
4538
4539 #undef TARGET_LITTLE_SYM
4540 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4541 #undef TARGET_LITTLE_NAME
4542 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4543
4544 #undef ELF_TARGET_OS
4545 #define ELF_TARGET_OS is_solaris
4546
4547 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4548 objects won't be recognized. */
4549 #undef ELF_OSABI
4550
4551 #undef elf32_bed
4552 #define elf32_bed elf32_i386_sol2_bed
4553
4554 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4555 boundary. */
4556 #undef elf_backend_static_tls_alignment
4557 #define elf_backend_static_tls_alignment 8
4558
4559 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4560
4561 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4562 File, p.63. */
4563 #undef elf_backend_want_plt_sym
4564 #define elf_backend_want_plt_sym 1
4565
4566 #undef elf_backend_strtab_flags
4567 #define elf_backend_strtab_flags SHF_STRINGS
4568
4569 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4570 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4571 FALSE otherwise. ISECTION is the best guess matching section from the
4572 input bfd IBFD, but it might be NULL. */
4573
4574 static bool
4575 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4576 bfd *obfd ATTRIBUTE_UNUSED,
4577 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4578 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4579 {
4580 /* PR 19938: FIXME: Need to add code for setting the sh_info
4581 and sh_link fields of Solaris specific section types. */
4582 return false;
4583
4584 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4585 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4586
4587 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4588
4589 The following values should be set:
4590
4591 Type Link Info
4592 -----------------------------------------------------------------------------
4593 SHT_SUNW_ancillary The section header index of 0
4594 [0x6fffffee] the associated string table.
4595
4596 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4597 [0x6ffffff0] the associated symbol table. section header index of
4598 the associated
4599 SHT_SUNW_capchain table,
4600 otherwise 0.
4601
4602 SHT_SUNW_symsort The section header index of 0
4603 [0x6ffffff1] the associated symbol table.
4604
4605 SHT_SUNW_tlssort The section header index of 0
4606 [0x6ffffff2] the associated symbol table.
4607
4608 SHT_SUNW_LDYNSYM The section header index of One greater than the
4609 [0x6ffffff3] the associated string table. symbol table index of the
4610 This index is the same string last local symbol,
4611 table used by the SHT_DYNSYM STB_LOCAL. Since
4612 section. SHT_SUNW_LDYNSYM only
4613 contains local symbols,
4614 sh_info is equivalent to
4615 the number of symbols in
4616 the table.
4617
4618 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4619 [0x6ffffff5] the section header index of to named strings, the
4620 the associated section header index of
4621 SHT_SUNW_capinfo table, the associated string
4622 otherwise 0. table, otherwise 0.
4623
4624 SHT_SUNW_move The section header index of 0
4625 [0x6ffffffa] the associated symbol table.
4626
4627 SHT_SUNW_COMDAT 0 0
4628 [0x6ffffffb]
4629
4630 SHT_SUNW_syminfo The section header index of The section header index
4631 [0x6ffffffc] the associated symbol table. of the associated
4632 .dynamic section.
4633
4634 SHT_SUNW_verdef The section header index of The number of version
4635 [0x6ffffffd] the associated string table. definitions within the
4636 section.
4637
4638 SHT_SUNW_verneed The section header index of The number of version
4639 [0x6ffffffe] the associated string table. dependencies within the
4640 section.
4641
4642 SHT_SUNW_versym The section header index of 0
4643 [0x6fffffff] the associated symbol table. */
4644 }
4645
4646 #undef elf_backend_copy_special_section_fields
4647 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4648
4649 #include "elf32-target.h"
4650
4651 /* Intel MCU support. */
4652
4653 static bool
4654 elf32_iamcu_elf_object_p (bfd *abfd)
4655 {
4656 /* Set the right machine number for an IAMCU elf32 file. */
4657 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4658 return true;
4659 }
4660
4661 #undef TARGET_LITTLE_SYM
4662 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4663 #undef TARGET_LITTLE_NAME
4664 #define TARGET_LITTLE_NAME "elf32-iamcu"
4665 #undef ELF_ARCH
4666 #define ELF_ARCH bfd_arch_iamcu
4667
4668 #undef ELF_MACHINE_CODE
4669 #define ELF_MACHINE_CODE EM_IAMCU
4670
4671 #undef ELF_TARGET_OS
4672 #undef ELF_OSABI
4673
4674 #undef elf32_bed
4675 #define elf32_bed elf32_iamcu_bed
4676
4677 #undef elf_backend_object_p
4678 #define elf_backend_object_p elf32_iamcu_elf_object_p
4679
4680 #undef elf_backend_static_tls_alignment
4681
4682 #undef elf_backend_want_plt_sym
4683 #define elf_backend_want_plt_sym 0
4684
4685 #undef elf_backend_strtab_flags
4686 #undef elf_backend_copy_special_section_fields
4687
4688 #include "elf32-target.h"
4689
4690 /* Restore defaults. */
4691 #undef ELF_ARCH
4692 #define ELF_ARCH bfd_arch_i386
4693 #undef ELF_MACHINE_CODE
4694 #define ELF_MACHINE_CODE EM_386
4695 #undef elf_backend_object_p
4696
4697 /* VxWorks support. */
4698
4699 #undef TARGET_LITTLE_SYM
4700 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4701 #undef TARGET_LITTLE_NAME
4702 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4703 #undef ELF_OSABI
4704 #undef ELF_MAXPAGESIZE
4705 #define ELF_MAXPAGESIZE 0x1000
4706 #undef elf_backend_plt_alignment
4707 #define elf_backend_plt_alignment 4
4708
4709 #undef ELF_TARGET_OS
4710 #define ELF_TARGET_OS is_vxworks
4711
4712 #undef elf_backend_relocs_compatible
4713 #undef elf_backend_add_symbol_hook
4714 #define elf_backend_add_symbol_hook \
4715 elf_vxworks_add_symbol_hook
4716 #undef elf_backend_link_output_symbol_hook
4717 #define elf_backend_link_output_symbol_hook \
4718 elf_vxworks_link_output_symbol_hook
4719 #undef elf_backend_emit_relocs
4720 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4721 #undef elf_backend_final_write_processing
4722 #define elf_backend_final_write_processing \
4723 elf_vxworks_final_write_processing
4724 #undef elf_backend_static_tls_alignment
4725
4726 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4727 define it. */
4728 #undef elf_backend_want_plt_sym
4729 #define elf_backend_want_plt_sym 1
4730
4731 #undef elf32_bed
4732 #define elf32_bed elf32_i386_vxworks_bed
4733
4734 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.