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