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x86: Define check_relocs_failed in elfxx-x86.h
[thirdparty/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2021 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, 3, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 1, 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, 1, 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, 0, 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, 0, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 3, 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, 2, 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, 2, 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, 2, 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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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_check_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
528
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
530
531 #define LAZY_PLT_ENTRY_SIZE 16
532
533 /* The size in bytes of an entry in the non-lazy procedure linkage
534 table. */
535
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
537
538 /* The first entry in an absolute lazy procedure linkage table looks
539 like this. See the SVR4 ABI i386 supplement to see how this works.
540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
541
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
543 {
544 0xff, 0x35, /* pushl contents of address */
545 0, 0, 0, 0, /* replaced with address of .got + 4. */
546 0xff, 0x25, /* jmp indirect */
547 0, 0, 0, 0 /* replaced with address of .got + 8. */
548 };
549
550 /* Subsequent entries in an absolute lazy procedure linkage table look
551 like this. */
552
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
557 0x68, /* pushl immediate */
558 0, 0, 0, 0, /* replaced with offset into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt. */
561 };
562
563 /* The first entry in a PIC lazy procedure linkage table look like
564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
565 lazy_plt->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
574 this. */
575
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
577 {
578 0xff, 0xa3, /* jmp *offset(%ebx) */
579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
580 0x68, /* pushl immediate */
581 0, 0, 0, 0, /* replaced with offset into relocation table. */
582 0xe9, /* jmp relative */
583 0, 0, 0, 0 /* replaced with offset to start of .plt. */
584 };
585
586 /* Entries in the non-lazy procedure linkage table look like this. */
587
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
589 {
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
593 };
594
595 /* Entries in the PIC non-lazy procedure linkage table look like
596 this. */
597
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
599 {
600 0xff, 0xa3, /* jmp *offset(%ebx) */
601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
602 0x66, 0x90 /* xchg %ax,%ax */
603 };
604
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
607
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
609 {
610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
613 };
614
615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
616 table look like this. Subsequent entries for a PIC IBT-enabled lazy
617 procedure linkage table are the same. */
618
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
620 {
621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
622 0x68, 0, 0, 0, 0, /* pushl immediate */
623 0xe9, 0, 0, 0, 0, /* jmp relative */
624 0x66, 0x90 /* xchg %ax,%ax */
625 };
626
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
628 look like. */
629
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
631 {
632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
635 };
636
637 /* Entries for branches with IBT-enabled in the absolute non-lazey
638 procedure linkage table look like this. They have the same size
639 as the lazy PLT entry. */
640
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
642 {
643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 };
647
648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
649 linkage table look like this. They have the same size as the lazy
650 PLT entry. */
651
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
653 {
654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
657 };
658
659 /* .eh_frame covering the lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
662 {
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
665 1, /* CIE version */
666 'z', 'R', 0, /* Augmentation string */
667 1, /* Code alignment factor */
668 0x7c, /* Data alignment factor */
669 8, /* Return address column */
670 1, /* Augmentation size */
671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
674 DW_CFA_nop, DW_CFA_nop,
675
676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
679 0, 0, 0, 0, /* .plt size goes here */
680 0, /* Augmentation size */
681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
686 11, /* Block length */
687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
690 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
692 };
693
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
695
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
697 {
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
700 1, /* CIE version */
701 'z', 'R', 0, /* Augmentation string */
702 1, /* Code alignment factor */
703 0x7c, /* Data alignment factor */
704 8, /* Return address column */
705 1, /* Augmentation size */
706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
709 DW_CFA_nop, DW_CFA_nop,
710
711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
714 0, 0, 0, 0, /* .plt size goes here */
715 0, /* Augmentation size */
716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
721 11, /* Block length */
722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
727 };
728
729 /* .eh_frame covering the non-lazy .plt section. */
730
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
732 {
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
736 1, /* CIE version */
737 'z', 'R', 0, /* Augmentation string */
738 1, /* Code alignment factor */
739 0x7c, /* Data alignment factor */
740 8, /* Return address column */
741 1, /* Augmentation size */
742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
745 DW_CFA_nop, DW_CFA_nop,
746
747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
750 0, 0, 0, 0, /* non-lazy .plt size goes here */
751 0, /* Augmentation size */
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
757 {
758 elf_i386_lazy_plt0_entry, /* plt0_entry */
759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
760 elf_i386_lazy_plt_entry, /* plt_entry */
761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
762 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_check_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 /* Skip __start_SECNAME/__stop_SECNAME when --gc-sections
1391 -z start-stop-gc are used. */
1392 if (elf_x86_start_stop_gc_p (link_info, h))
1393 return true;
1394
1395 convert_load:
1396 if (opcode == 0x8b)
1397 {
1398 if (abs_symbol && local_ref)
1399 to_reloc_32 = true;
1400
1401 if (to_reloc_32)
1402 {
1403 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1404 "mov $foo, %reg2" with R_386_32. */
1405 r_type = R_386_32;
1406 modrm = 0xc0 | (modrm & 0x38) >> 3;
1407 bfd_put_8 (abfd, modrm, contents + roff - 1);
1408 opcode = 0xc7;
1409 }
1410 else
1411 {
1412 /* Convert "mov foo@GOT(%reg1), %reg2" to
1413 "lea foo@GOTOFF(%reg1), %reg2". */
1414 r_type = R_386_GOTOFF;
1415 opcode = 0x8d;
1416 }
1417 }
1418 else
1419 {
1420 /* Only R_386_32 is supported. */
1421 if (!to_reloc_32)
1422 return true;
1423
1424 if (opcode == 0x85)
1425 {
1426 /* Convert "test %reg1, foo@GOT(%reg2)" to
1427 "test $foo, %reg1". */
1428 modrm = 0xc0 | (modrm & 0x38) >> 3;
1429 opcode = 0xf7;
1430 }
1431 else
1432 {
1433 /* Convert "binop foo@GOT(%reg1), %reg2" to
1434 "binop $foo, %reg2". */
1435 modrm = (0xc0
1436 | (modrm & 0x38) >> 3
1437 | (opcode & 0x3c));
1438 opcode = 0x81;
1439 }
1440 bfd_put_8 (abfd, modrm, contents + roff - 1);
1441 r_type = R_386_32;
1442 }
1443
1444 bfd_put_8 (abfd, opcode, contents + roff - 2);
1445 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1446 *r_type_p = r_type;
1447 *converted = true;
1448 }
1449 }
1450
1451 return true;
1452 }
1453
1454 /* Look through the relocs for a section during the first phase, and
1455 calculate needed space in the global offset table, procedure linkage
1456 table, and dynamic reloc sections. */
1457
1458 static bool
1459 elf_i386_check_relocs (bfd *abfd,
1460 struct bfd_link_info *info,
1461 asection *sec,
1462 const Elf_Internal_Rela *relocs)
1463 {
1464 struct elf_x86_link_hash_table *htab;
1465 Elf_Internal_Shdr *symtab_hdr;
1466 struct elf_link_hash_entry **sym_hashes;
1467 const Elf_Internal_Rela *rel;
1468 const Elf_Internal_Rela *rel_end;
1469 asection *sreloc;
1470 bfd_byte *contents;
1471 bool converted;
1472
1473 if (bfd_link_relocatable (info))
1474 return true;
1475
1476 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1477 if (htab == NULL)
1478 {
1479 sec->check_relocs_failed = 1;
1480 return false;
1481 }
1482
1483 BFD_ASSERT (is_x86_elf (abfd, htab));
1484
1485 /* Get the section contents. */
1486 if (elf_section_data (sec)->this_hdr.contents != NULL)
1487 contents = elf_section_data (sec)->this_hdr.contents;
1488 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1489 {
1490 sec->check_relocs_failed = 1;
1491 return false;
1492 }
1493
1494 symtab_hdr = &elf_symtab_hdr (abfd);
1495 sym_hashes = elf_sym_hashes (abfd);
1496
1497 converted = false;
1498
1499 sreloc = NULL;
1500
1501 rel_end = relocs + sec->reloc_count;
1502 for (rel = relocs; rel < rel_end; rel++)
1503 {
1504 unsigned int r_type;
1505 unsigned int r_symndx;
1506 struct elf_link_hash_entry *h;
1507 struct elf_x86_link_hash_entry *eh;
1508 Elf_Internal_Sym *isym;
1509 const char *name;
1510 bool size_reloc;
1511 bool no_dynreloc;
1512
1513 r_symndx = ELF32_R_SYM (rel->r_info);
1514 r_type = ELF32_R_TYPE (rel->r_info);
1515
1516 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1517 {
1518 /* xgettext:c-format */
1519 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1520 abfd, r_symndx);
1521 goto error_return;
1522 }
1523
1524 if (r_symndx < symtab_hdr->sh_info)
1525 {
1526 /* A local symbol. */
1527 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1528 abfd, r_symndx);
1529 if (isym == NULL)
1530 goto error_return;
1531
1532 /* Check relocation against local STT_GNU_IFUNC symbol. */
1533 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1534 {
1535 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1536 if (h == NULL)
1537 goto error_return;
1538
1539 /* Fake a STT_GNU_IFUNC symbol. */
1540 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1541 isym, NULL);
1542 h->type = STT_GNU_IFUNC;
1543 h->def_regular = 1;
1544 h->ref_regular = 1;
1545 h->forced_local = 1;
1546 h->root.type = bfd_link_hash_defined;
1547 }
1548 else
1549 h = NULL;
1550 }
1551 else
1552 {
1553 isym = NULL;
1554 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1555 while (h->root.type == bfd_link_hash_indirect
1556 || h->root.type == bfd_link_hash_warning)
1557 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1558 }
1559
1560 eh = (struct elf_x86_link_hash_entry *) h;
1561 if (h != NULL)
1562 {
1563 if (r_type == R_386_GOTOFF)
1564 eh->gotoff_ref = 1;
1565
1566 /* It is referenced by a non-shared object. */
1567 h->ref_regular = 1;
1568 }
1569
1570 if (r_type == R_386_GOT32X
1571 && (h == NULL || h->type != STT_GNU_IFUNC))
1572 {
1573 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1574 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1575 &r_type, irel, h,
1576 &converted, info))
1577 goto error_return;
1578 }
1579
1580 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1581 symtab_hdr, &no_dynreloc))
1582 return false;
1583
1584 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1585 symtab_hdr, sym_hashes,
1586 &r_type, GOT_UNKNOWN,
1587 rel, rel_end, h, r_symndx, false))
1588 goto error_return;
1589
1590 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1591 if (h == htab->elf.hgot)
1592 htab->got_referenced = true;
1593
1594 switch (r_type)
1595 {
1596 case R_386_TLS_LDM:
1597 htab->tls_ld_or_ldm_got.refcount = 1;
1598 goto create_got;
1599
1600 case R_386_PLT32:
1601 /* This symbol requires a procedure linkage table entry. We
1602 actually build the entry in adjust_dynamic_symbol,
1603 because this might be a case of linking PIC code which is
1604 never referenced by a dynamic object, in which case we
1605 don't need to generate a procedure linkage table entry
1606 after all. */
1607
1608 /* If this is a local symbol, we resolve it directly without
1609 creating a procedure linkage table entry. */
1610 if (h == NULL)
1611 continue;
1612
1613 eh->zero_undefweak &= 0x2;
1614 h->needs_plt = 1;
1615 h->plt.refcount = 1;
1616 break;
1617
1618 case R_386_SIZE32:
1619 size_reloc = true;
1620 goto do_size;
1621
1622 case R_386_TLS_IE_32:
1623 case R_386_TLS_IE:
1624 case R_386_TLS_GOTIE:
1625 if (!bfd_link_executable (info))
1626 info->flags |= DF_STATIC_TLS;
1627 /* Fall through */
1628
1629 case R_386_GOT32:
1630 case R_386_GOT32X:
1631 case R_386_TLS_GD:
1632 case R_386_TLS_GOTDESC:
1633 case R_386_TLS_DESC_CALL:
1634 /* This symbol requires a global offset table entry. */
1635 {
1636 int tls_type, old_tls_type;
1637
1638 switch (r_type)
1639 {
1640 default:
1641 case R_386_GOT32:
1642 case R_386_GOT32X:
1643 tls_type = GOT_NORMAL;
1644 break;
1645 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1646 case R_386_TLS_GOTDESC:
1647 case R_386_TLS_DESC_CALL:
1648 tls_type = GOT_TLS_GDESC; break;
1649 case R_386_TLS_IE_32:
1650 if (ELF32_R_TYPE (rel->r_info) == r_type)
1651 tls_type = GOT_TLS_IE_NEG;
1652 else
1653 /* If this is a GD->IE transition, we may use either of
1654 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1655 tls_type = GOT_TLS_IE;
1656 break;
1657 case R_386_TLS_IE:
1658 case R_386_TLS_GOTIE:
1659 tls_type = GOT_TLS_IE_POS; break;
1660 }
1661
1662 if (h != NULL)
1663 {
1664 h->got.refcount = 1;
1665 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1666 }
1667 else
1668 {
1669 bfd_signed_vma *local_got_refcounts;
1670
1671 /* This is a global offset table entry for a local symbol. */
1672 local_got_refcounts = elf_local_got_refcounts (abfd);
1673 if (local_got_refcounts == NULL)
1674 {
1675 bfd_size_type size;
1676
1677 size = symtab_hdr->sh_info;
1678 size *= (sizeof (bfd_signed_vma)
1679 + sizeof (bfd_vma) + sizeof(char));
1680 local_got_refcounts = (bfd_signed_vma *)
1681 bfd_zalloc (abfd, size);
1682 if (local_got_refcounts == NULL)
1683 goto error_return;
1684 elf_local_got_refcounts (abfd) = local_got_refcounts;
1685 elf_x86_local_tlsdesc_gotent (abfd)
1686 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1687 elf_x86_local_got_tls_type (abfd)
1688 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1689 }
1690 local_got_refcounts[r_symndx] = 1;
1691 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1692 }
1693
1694 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1695 tls_type |= old_tls_type;
1696 /* If a TLS symbol is accessed using IE at least once,
1697 there is no point to use dynamic model for it. */
1698 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1699 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1700 || (tls_type & GOT_TLS_IE) == 0))
1701 {
1702 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1703 tls_type = old_tls_type;
1704 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1705 && GOT_TLS_GD_ANY_P (tls_type))
1706 tls_type |= old_tls_type;
1707 else
1708 {
1709 if (h)
1710 name = h->root.root.string;
1711 else
1712 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1713 NULL);
1714 _bfd_error_handler
1715 /* xgettext:c-format */
1716 (_("%pB: `%s' accessed both as normal and "
1717 "thread local symbol"),
1718 abfd, name);
1719 bfd_set_error (bfd_error_bad_value);
1720 goto error_return;
1721 }
1722 }
1723
1724 if (old_tls_type != tls_type)
1725 {
1726 if (h != NULL)
1727 elf_x86_hash_entry (h)->tls_type = tls_type;
1728 else
1729 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1730 }
1731 }
1732 /* Fall through */
1733
1734 case R_386_GOTOFF:
1735 case R_386_GOTPC:
1736 create_got:
1737 if (r_type != R_386_TLS_IE)
1738 {
1739 if (eh != NULL)
1740 {
1741 eh->zero_undefweak &= 0x2;
1742
1743 /* Need GOT to resolve undefined weak symbol to 0. */
1744 if (r_type == R_386_GOTOFF
1745 && h->root.type == bfd_link_hash_undefweak
1746 && bfd_link_executable (info))
1747 htab->got_referenced = true;
1748 }
1749 break;
1750 }
1751 /* Fall through */
1752
1753 case R_386_TLS_LE_32:
1754 case R_386_TLS_LE:
1755 if (eh != NULL)
1756 eh->zero_undefweak &= 0x2;
1757 if (bfd_link_executable (info))
1758 break;
1759 info->flags |= DF_STATIC_TLS;
1760 goto do_relocation;
1761
1762 case R_386_32:
1763 case R_386_PC32:
1764 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1765 eh->zero_undefweak |= 0x2;
1766 do_relocation:
1767 /* We are called after all symbols have been resolved. Only
1768 relocation against STT_GNU_IFUNC symbol must go through
1769 PLT. */
1770 if (h != NULL
1771 && (bfd_link_executable (info)
1772 || h->type == STT_GNU_IFUNC))
1773 {
1774 bool func_pointer_ref = false;
1775
1776 if (r_type == R_386_PC32)
1777 {
1778 /* Since something like ".long foo - ." may be used
1779 as pointer, make sure that PLT is used if foo is
1780 a function defined in a shared library. */
1781 if ((sec->flags & SEC_CODE) == 0)
1782 h->pointer_equality_needed = 1;
1783 else if (h->type == STT_GNU_IFUNC
1784 && bfd_link_pic (info))
1785 {
1786 _bfd_error_handler
1787 /* xgettext:c-format */
1788 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1789 abfd, h->root.root.string);
1790 bfd_set_error (bfd_error_bad_value);
1791 goto error_return;
1792 }
1793 }
1794 else
1795 {
1796 h->pointer_equality_needed = 1;
1797 /* R_386_32 can be resolved at run-time. */
1798 if (r_type == R_386_32
1799 && (sec->flags & SEC_READONLY) == 0)
1800 func_pointer_ref = true;
1801 }
1802
1803 if (!func_pointer_ref)
1804 {
1805 /* If this reloc is in a read-only section, we might
1806 need a copy reloc. We can't check reliably at this
1807 stage whether the section is read-only, as input
1808 sections have not yet been mapped to output sections.
1809 Tentatively set the flag for now, and correct in
1810 adjust_dynamic_symbol. */
1811 h->non_got_ref = 1;
1812
1813 if (!elf_has_indirect_extern_access (sec->owner))
1814 eh->non_got_ref_without_indirect_extern_access = 1;
1815
1816 /* We may need a .plt entry if the symbol is a function
1817 defined in a shared lib or is a function referenced
1818 from the code or read-only section. */
1819 if (!h->def_regular
1820 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1821 h->plt.refcount = 1;
1822 }
1823 }
1824
1825 size_reloc = false;
1826 do_size:
1827 if (!no_dynreloc
1828 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
1829 r_type, R_386_32))
1830 {
1831 struct elf_dyn_relocs *p;
1832 struct elf_dyn_relocs **head;
1833
1834 /* We must copy these reloc types into the output file.
1835 Create a reloc section in dynobj and make room for
1836 this reloc. */
1837 if (sreloc == NULL)
1838 {
1839 sreloc = _bfd_elf_make_dynamic_reloc_section
1840 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ false);
1841
1842 if (sreloc == NULL)
1843 goto error_return;
1844 }
1845
1846 /* If this is a global symbol, we count the number of
1847 relocations we need for this symbol. */
1848 if (h != NULL)
1849 {
1850 head = &h->dyn_relocs;
1851 }
1852 else
1853 {
1854 /* Track dynamic relocs needed for local syms too.
1855 We really need local syms available to do this
1856 easily. Oh well. */
1857 void **vpp;
1858 asection *s;
1859
1860 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1861 abfd, r_symndx);
1862 if (isym == NULL)
1863 goto error_return;
1864
1865 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1866 if (s == NULL)
1867 s = sec;
1868
1869 vpp = &elf_section_data (s)->local_dynrel;
1870 head = (struct elf_dyn_relocs **)vpp;
1871 }
1872
1873 p = *head;
1874 if (p == NULL || p->sec != sec)
1875 {
1876 size_t amt = sizeof *p;
1877 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1878 amt);
1879 if (p == NULL)
1880 goto error_return;
1881 p->next = *head;
1882 *head = p;
1883 p->sec = sec;
1884 p->count = 0;
1885 p->pc_count = 0;
1886 }
1887
1888 p->count += 1;
1889 /* Count size relocation as PC-relative relocation. */
1890 if (r_type == R_386_PC32 || size_reloc)
1891 p->pc_count += 1;
1892 }
1893 break;
1894
1895 /* This relocation describes the C++ object vtable hierarchy.
1896 Reconstruct it for later use during GC. */
1897 case R_386_GNU_VTINHERIT:
1898 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1899 goto error_return;
1900 break;
1901
1902 /* This relocation describes which C++ vtable entries are actually
1903 used. Record for later use during GC. */
1904 case R_386_GNU_VTENTRY:
1905 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1906 goto error_return;
1907 break;
1908
1909 default:
1910 break;
1911 }
1912 }
1913
1914 if (elf_section_data (sec)->this_hdr.contents != contents)
1915 {
1916 if (!converted && !_bfd_link_keep_memory (info))
1917 free (contents);
1918 else
1919 {
1920 /* Cache the section contents for elf_link_input_bfd if any
1921 load is converted or --no-keep-memory isn't used. */
1922 elf_section_data (sec)->this_hdr.contents = contents;
1923 info->cache_size += sec->size;
1924 }
1925 }
1926
1927 /* Cache relocations if any load is converted. */
1928 if (elf_section_data (sec)->relocs != relocs && converted)
1929 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1930
1931 return true;
1932
1933 error_return:
1934 if (elf_section_data (sec)->this_hdr.contents != contents)
1935 free (contents);
1936 sec->check_relocs_failed = 1;
1937 return false;
1938 }
1939
1940 /* Set the correct type for an x86 ELF section. We do this by the
1941 section name, which is a hack, but ought to work. */
1942
1943 static bool
1944 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1945 Elf_Internal_Shdr *hdr,
1946 asection *sec)
1947 {
1948 const char *name;
1949
1950 name = bfd_section_name (sec);
1951
1952 /* This is an ugly, but unfortunately necessary hack that is
1953 needed when producing EFI binaries on x86. It tells
1954 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1955 containing ELF relocation info. We need this hack in order to
1956 be able to generate ELF binaries that can be translated into
1957 EFI applications (which are essentially COFF objects). Those
1958 files contain a COFF ".reloc" section inside an ELFNN object,
1959 which would normally cause BFD to segfault because it would
1960 attempt to interpret this section as containing relocation
1961 entries for section "oc". With this hack enabled, ".reloc"
1962 will be treated as a normal data section, which will avoid the
1963 segfault. However, you won't be able to create an ELFNN binary
1964 with a section named "oc" that needs relocations, but that's
1965 the kind of ugly side-effects you get when detecting section
1966 types based on their names... In practice, this limitation is
1967 unlikely to bite. */
1968 if (strcmp (name, ".reloc") == 0)
1969 hdr->sh_type = SHT_PROGBITS;
1970
1971 return true;
1972 }
1973
1974 /* Return the relocation value for @tpoff relocation
1975 if STT_TLS virtual address is ADDRESS. */
1976
1977 static bfd_vma
1978 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1979 {
1980 struct elf_link_hash_table *htab = elf_hash_table (info);
1981 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1982 bfd_vma static_tls_size;
1983
1984 /* If tls_sec is NULL, we should have signalled an error already. */
1985 if (htab->tls_sec == NULL)
1986 return 0;
1987
1988 /* Consider special static TLS alignment requirements. */
1989 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1990 return static_tls_size + htab->tls_sec->vma - address;
1991 }
1992
1993 /* Relocate an i386 ELF section. */
1994
1995 static int
1996 elf_i386_relocate_section (bfd *output_bfd,
1997 struct bfd_link_info *info,
1998 bfd *input_bfd,
1999 asection *input_section,
2000 bfd_byte *contents,
2001 Elf_Internal_Rela *relocs,
2002 Elf_Internal_Sym *local_syms,
2003 asection **local_sections)
2004 {
2005 struct elf_x86_link_hash_table *htab;
2006 Elf_Internal_Shdr *symtab_hdr;
2007 struct elf_link_hash_entry **sym_hashes;
2008 bfd_vma *local_got_offsets;
2009 bfd_vma *local_tlsdesc_gotents;
2010 Elf_Internal_Rela *rel;
2011 Elf_Internal_Rela *wrel;
2012 Elf_Internal_Rela *relend;
2013 bool is_vxworks_tls;
2014 unsigned plt_entry_size;
2015
2016 /* Skip if check_relocs failed. */
2017 if (input_section->check_relocs_failed)
2018 return false;
2019
2020 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2021 if (htab == NULL)
2022 return false;
2023
2024 if (!is_x86_elf (input_bfd, htab))
2025 {
2026 bfd_set_error (bfd_error_wrong_format);
2027 return false;
2028 }
2029
2030 symtab_hdr = &elf_symtab_hdr (input_bfd);
2031 sym_hashes = elf_sym_hashes (input_bfd);
2032 local_got_offsets = elf_local_got_offsets (input_bfd);
2033 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2034 /* We have to handle relocations in vxworks .tls_vars sections
2035 specially, because the dynamic loader is 'weird'. */
2036 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2037 && bfd_link_pic (info)
2038 && !strcmp (input_section->output_section->name,
2039 ".tls_vars"));
2040
2041 _bfd_x86_elf_set_tls_module_base (info);
2042
2043 plt_entry_size = htab->plt.plt_entry_size;
2044
2045 rel = wrel = relocs;
2046 relend = relocs + input_section->reloc_count;
2047 for (; rel < relend; wrel++, rel++)
2048 {
2049 unsigned int r_type, r_type_tls;
2050 reloc_howto_type *howto;
2051 unsigned long r_symndx;
2052 struct elf_link_hash_entry *h;
2053 struct elf_x86_link_hash_entry *eh;
2054 Elf_Internal_Sym *sym;
2055 asection *sec;
2056 bfd_vma off, offplt, plt_offset;
2057 bfd_vma relocation;
2058 bool unresolved_reloc;
2059 bfd_reloc_status_type r;
2060 unsigned int indx;
2061 int tls_type;
2062 bfd_vma st_size;
2063 asection *resolved_plt;
2064 bool resolved_to_zero;
2065 bool relative_reloc;
2066
2067 r_type = ELF32_R_TYPE (rel->r_info);
2068 if (r_type == R_386_GNU_VTINHERIT
2069 || r_type == R_386_GNU_VTENTRY)
2070 {
2071 if (wrel != rel)
2072 *wrel = *rel;
2073 continue;
2074 }
2075
2076 howto = elf_i386_rtype_to_howto (r_type);
2077 if (howto == NULL)
2078 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2079
2080 r_symndx = ELF32_R_SYM (rel->r_info);
2081 h = NULL;
2082 sym = NULL;
2083 sec = NULL;
2084 unresolved_reloc = false;
2085 if (r_symndx < symtab_hdr->sh_info)
2086 {
2087 sym = local_syms + r_symndx;
2088 sec = local_sections[r_symndx];
2089 relocation = (sec->output_section->vma
2090 + sec->output_offset
2091 + sym->st_value);
2092 st_size = sym->st_size;
2093
2094 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2095 && ((sec->flags & SEC_MERGE) != 0
2096 || (bfd_link_relocatable (info)
2097 && sec->output_offset != 0)))
2098 {
2099 bfd_vma addend;
2100 bfd_byte *where = contents + rel->r_offset;
2101
2102 switch (howto->size)
2103 {
2104 case 0:
2105 addend = bfd_get_8 (input_bfd, where);
2106 if (howto->pc_relative)
2107 {
2108 addend = (addend ^ 0x80) - 0x80;
2109 addend += 1;
2110 }
2111 break;
2112 case 1:
2113 addend = bfd_get_16 (input_bfd, where);
2114 if (howto->pc_relative)
2115 {
2116 addend = (addend ^ 0x8000) - 0x8000;
2117 addend += 2;
2118 }
2119 break;
2120 case 2:
2121 addend = bfd_get_32 (input_bfd, where);
2122 if (howto->pc_relative)
2123 {
2124 addend = (addend ^ 0x80000000) - 0x80000000;
2125 addend += 4;
2126 }
2127 break;
2128 default:
2129 abort ();
2130 }
2131
2132 if (bfd_link_relocatable (info))
2133 addend += sec->output_offset;
2134 else
2135 {
2136 asection *msec = sec;
2137 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2138 addend);
2139 addend -= relocation;
2140 addend += msec->output_section->vma + msec->output_offset;
2141 }
2142
2143 switch (howto->size)
2144 {
2145 case 0:
2146 /* FIXME: overflow checks. */
2147 if (howto->pc_relative)
2148 addend -= 1;
2149 bfd_put_8 (input_bfd, addend, where);
2150 break;
2151 case 1:
2152 if (howto->pc_relative)
2153 addend -= 2;
2154 bfd_put_16 (input_bfd, addend, where);
2155 break;
2156 case 2:
2157 if (howto->pc_relative)
2158 addend -= 4;
2159 bfd_put_32 (input_bfd, addend, where);
2160 break;
2161 }
2162 }
2163 else if (!bfd_link_relocatable (info)
2164 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2165 {
2166 /* Relocate against local STT_GNU_IFUNC symbol. */
2167 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2168 false);
2169 if (h == NULL)
2170 abort ();
2171
2172 /* Set STT_GNU_IFUNC symbol value. */
2173 h->root.u.def.value = sym->st_value;
2174 h->root.u.def.section = sec;
2175 }
2176 }
2177 else
2178 {
2179 bool warned ATTRIBUTE_UNUSED;
2180 bool ignored ATTRIBUTE_UNUSED;
2181
2182 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2183 r_symndx, symtab_hdr, sym_hashes,
2184 h, sec, relocation,
2185 unresolved_reloc, warned, ignored);
2186 st_size = h->size;
2187 }
2188
2189 if (sec != NULL && discarded_section (sec))
2190 {
2191 _bfd_clear_contents (howto, input_bfd, input_section,
2192 contents, rel->r_offset);
2193 wrel->r_offset = rel->r_offset;
2194 wrel->r_info = 0;
2195 wrel->r_addend = 0;
2196
2197 /* For ld -r, remove relocations in debug sections against
2198 sections defined in discarded sections. Not done for
2199 eh_frame editing code expects to be present. */
2200 if (bfd_link_relocatable (info)
2201 && (input_section->flags & SEC_DEBUGGING))
2202 wrel--;
2203
2204 continue;
2205 }
2206
2207 if (bfd_link_relocatable (info))
2208 {
2209 if (wrel != rel)
2210 *wrel = *rel;
2211 continue;
2212 }
2213
2214 eh = (struct elf_x86_link_hash_entry *) h;
2215
2216 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2217 it here if it is defined in a non-shared object. */
2218 if (h != NULL
2219 && h->type == STT_GNU_IFUNC
2220 && h->def_regular)
2221 {
2222 asection *gotplt, *base_got;
2223 bfd_vma plt_index;
2224 const char *name;
2225
2226 if ((input_section->flags & SEC_ALLOC) == 0)
2227 {
2228 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2229 STT_GNU_IFUNC symbol as STT_FUNC. */
2230 if (elf_section_type (input_section) == SHT_NOTE)
2231 goto skip_ifunc;
2232 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2233 sections because such sections are not SEC_ALLOC and
2234 thus ld.so will not process them. */
2235 if ((input_section->flags & SEC_DEBUGGING) != 0)
2236 continue;
2237 abort ();
2238 }
2239
2240 /* STT_GNU_IFUNC symbol must go through PLT. */
2241 if (htab->elf.splt != NULL)
2242 {
2243 if (htab->plt_second != NULL)
2244 {
2245 resolved_plt = htab->plt_second;
2246 plt_offset = eh->plt_second.offset;
2247 }
2248 else
2249 {
2250 resolved_plt = htab->elf.splt;
2251 plt_offset = h->plt.offset;
2252 }
2253 gotplt = htab->elf.sgotplt;
2254 }
2255 else
2256 {
2257 resolved_plt = htab->elf.iplt;
2258 plt_offset = h->plt.offset;
2259 gotplt = htab->elf.igotplt;
2260 }
2261
2262 switch (r_type)
2263 {
2264 default:
2265 break;
2266
2267 case R_386_GOT32:
2268 case R_386_GOT32X:
2269 base_got = htab->elf.sgot;
2270 off = h->got.offset;
2271
2272 if (base_got == NULL)
2273 abort ();
2274
2275 if (off == (bfd_vma) -1)
2276 {
2277 /* We can't use h->got.offset here to save state, or
2278 even just remember the offset, as finish_dynamic_symbol
2279 would use that as offset into .got. */
2280
2281 if (h->plt.offset == (bfd_vma) -1)
2282 abort ();
2283
2284 if (htab->elf.splt != NULL)
2285 {
2286 plt_index = (h->plt.offset / plt_entry_size
2287 - htab->plt.has_plt0);
2288 off = (plt_index + 3) * 4;
2289 base_got = htab->elf.sgotplt;
2290 }
2291 else
2292 {
2293 plt_index = h->plt.offset / plt_entry_size;
2294 off = plt_index * 4;
2295 base_got = htab->elf.igotplt;
2296 }
2297
2298 if (h->dynindx == -1
2299 || h->forced_local
2300 || info->symbolic)
2301 {
2302 /* This references the local defitionion. We must
2303 initialize this entry in the global offset table.
2304 Since the offset must always be a multiple of 4,
2305 we use the least significant bit to record
2306 whether we have initialized it already.
2307
2308 When doing a dynamic link, we create a .rela.got
2309 relocation entry to initialize the value. This
2310 is done in the finish_dynamic_symbol routine. */
2311 if ((off & 1) != 0)
2312 off &= ~1;
2313 else
2314 {
2315 bfd_put_32 (output_bfd, relocation,
2316 base_got->contents + off);
2317 h->got.offset |= 1;
2318 }
2319 }
2320
2321 relocation = off;
2322 }
2323 else
2324 relocation = (base_got->output_section->vma
2325 + base_got->output_offset + off
2326 - gotplt->output_section->vma
2327 - gotplt->output_offset);
2328
2329 if (rel->r_offset > 1
2330 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2331 && *(contents + rel->r_offset - 2) != 0x8d)
2332 {
2333 if (bfd_link_pic (info))
2334 goto disallow_got32;
2335
2336 /* Add the GOT base if there is no base register. */
2337 relocation += (gotplt->output_section->vma
2338 + gotplt->output_offset);
2339 }
2340 else if (htab->elf.splt == NULL)
2341 {
2342 /* Adjust for static executables. */
2343 relocation += gotplt->output_offset;
2344 }
2345
2346 goto do_relocation;
2347 }
2348
2349 if (h->plt.offset == (bfd_vma) -1)
2350 {
2351 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2352 if (r_type == R_386_32
2353 && (input_section->flags & SEC_CODE) == 0)
2354 goto do_ifunc_pointer;
2355 goto bad_ifunc_reloc;
2356 }
2357
2358 relocation = (resolved_plt->output_section->vma
2359 + resolved_plt->output_offset + plt_offset);
2360
2361 switch (r_type)
2362 {
2363 default:
2364 bad_ifunc_reloc:
2365 if (h->root.root.string)
2366 name = h->root.root.string;
2367 else
2368 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2369 NULL);
2370 _bfd_error_handler
2371 /* xgettext:c-format */
2372 (_("%pB: relocation %s against STT_GNU_IFUNC "
2373 "symbol `%s' isn't supported"), input_bfd,
2374 howto->name, name);
2375 bfd_set_error (bfd_error_bad_value);
2376 return false;
2377
2378 case R_386_32:
2379 /* Generate dynamic relcoation only when there is a
2380 non-GOT reference in a shared object. */
2381 if ((bfd_link_pic (info) && h->non_got_ref)
2382 || h->plt.offset == (bfd_vma) -1)
2383 {
2384 Elf_Internal_Rela outrel;
2385 asection *sreloc;
2386 bfd_vma offset;
2387
2388 do_ifunc_pointer:
2389 /* Need a dynamic relocation to get the real function
2390 adddress. */
2391 offset = _bfd_elf_section_offset (output_bfd,
2392 info,
2393 input_section,
2394 rel->r_offset);
2395 if (offset == (bfd_vma) -1
2396 || offset == (bfd_vma) -2)
2397 abort ();
2398
2399 outrel.r_offset = (input_section->output_section->vma
2400 + input_section->output_offset
2401 + offset);
2402
2403 if (POINTER_LOCAL_IFUNC_P (info, h))
2404 {
2405 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2406 h->root.root.string,
2407 h->root.u.def.section->owner);
2408
2409 /* This symbol is resolved locally. */
2410 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2411
2412 if (htab->params->report_relative_reloc)
2413 _bfd_x86_elf_link_report_relative_reloc
2414 (info, input_section, h, sym,
2415 "R_386_IRELATIVE", &outrel);
2416
2417 bfd_put_32 (output_bfd,
2418 (h->root.u.def.value
2419 + h->root.u.def.section->output_section->vma
2420 + h->root.u.def.section->output_offset),
2421 contents + offset);
2422 }
2423 else
2424 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2425
2426 /* Dynamic relocations are stored in
2427 1. .rel.ifunc section in PIC object.
2428 2. .rel.got section in dynamic executable.
2429 3. .rel.iplt section in static executable. */
2430 if (bfd_link_pic (info))
2431 sreloc = htab->elf.irelifunc;
2432 else if (htab->elf.splt != NULL)
2433 sreloc = htab->elf.srelgot;
2434 else
2435 sreloc = htab->elf.irelplt;
2436 elf_append_rel (output_bfd, sreloc, &outrel);
2437
2438 /* If this reloc is against an external symbol, we
2439 do not want to fiddle with the addend. Otherwise,
2440 we need to include the symbol value so that it
2441 becomes an addend for the dynamic reloc. For an
2442 internal symbol, we have updated addend. */
2443 continue;
2444 }
2445 /* FALLTHROUGH */
2446 case R_386_PC32:
2447 case R_386_PLT32:
2448 goto do_relocation;
2449
2450 case R_386_GOTOFF:
2451 relocation -= (gotplt->output_section->vma
2452 + gotplt->output_offset);
2453 goto do_relocation;
2454 }
2455 }
2456
2457 skip_ifunc:
2458 resolved_to_zero = (eh != NULL
2459 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2460
2461 switch (r_type)
2462 {
2463 case R_386_GOT32X:
2464 case R_386_GOT32:
2465 /* Relocation is to the entry for this symbol in the global
2466 offset table. */
2467 if (htab->elf.sgot == NULL)
2468 abort ();
2469
2470 relative_reloc = false;
2471 if (h != NULL)
2472 {
2473 off = h->got.offset;
2474 if (RESOLVED_LOCALLY_P (info, h, htab))
2475 {
2476 /* We must initialize this entry in the global offset
2477 table. Since the offset must always be a multiple
2478 of 4, we use the least significant bit to record
2479 whether we have initialized it already.
2480
2481 When doing a dynamic link, we create a .rel.got
2482 relocation entry to initialize the value. This
2483 is done in the finish_dynamic_symbol routine. */
2484 if ((off & 1) != 0)
2485 off &= ~1;
2486 else
2487 {
2488 bfd_put_32 (output_bfd, relocation,
2489 htab->elf.sgot->contents + off);
2490 h->got.offset |= 1;
2491
2492 if (GENERATE_RELATIVE_RELOC_P (info, h))
2493 {
2494 /* PR ld/21402: If this symbol isn't dynamic
2495 in PIC, generate R_386_RELATIVE here. */
2496 eh->no_finish_dynamic_symbol = 1;
2497 relative_reloc = true;
2498 }
2499 }
2500 }
2501 else
2502 unresolved_reloc = false;
2503 }
2504 else
2505 {
2506 if (local_got_offsets == NULL)
2507 abort ();
2508
2509 off = local_got_offsets[r_symndx];
2510
2511 /* The offset must always be a multiple of 4. We use
2512 the least significant bit to record whether we have
2513 already generated the necessary reloc. */
2514 if ((off & 1) != 0)
2515 off &= ~1;
2516 else
2517 {
2518 bfd_put_32 (output_bfd, relocation,
2519 htab->elf.sgot->contents + off);
2520 local_got_offsets[r_symndx] |= 1;
2521
2522 if (bfd_link_pic (info))
2523 relative_reloc = true;
2524 }
2525 }
2526
2527 if (relative_reloc)
2528 {
2529 asection *s;
2530 Elf_Internal_Rela outrel;
2531
2532 s = htab->elf.srelgot;
2533 if (s == NULL)
2534 abort ();
2535
2536 outrel.r_offset = (htab->elf.sgot->output_section->vma
2537 + htab->elf.sgot->output_offset
2538 + off);
2539 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2540
2541 if (htab->params->report_relative_reloc)
2542 _bfd_x86_elf_link_report_relative_reloc
2543 (info, input_section, h, sym, "R_386_RELATIVE",
2544 &outrel);
2545
2546 elf_append_rel (output_bfd, s, &outrel);
2547 }
2548
2549 if (off >= (bfd_vma) -2)
2550 abort ();
2551
2552 relocation = (htab->elf.sgot->output_section->vma
2553 + htab->elf.sgot->output_offset + off);
2554 if (rel->r_offset > 1
2555 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2556 && *(contents + rel->r_offset - 2) != 0x8d)
2557 {
2558 if (bfd_link_pic (info))
2559 {
2560 /* For PIC, disallow R_386_GOT32 without a base
2561 register, except for "lea foo@GOT, %reg", since
2562 we don't know what the GOT base is. */
2563 const char *name;
2564
2565 disallow_got32:
2566 if (h == NULL || h->root.root.string == NULL)
2567 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2568 NULL);
2569 else
2570 name = h->root.root.string;
2571
2572 _bfd_error_handler
2573 /* xgettext:c-format */
2574 (_("%pB: direct GOT relocation %s against `%s'"
2575 " without base register can not be used"
2576 " when making a shared object"),
2577 input_bfd, howto->name, name);
2578 bfd_set_error (bfd_error_bad_value);
2579 return false;
2580 }
2581 }
2582 else
2583 {
2584 /* Subtract the .got.plt section address only with a base
2585 register. */
2586 relocation -= (htab->elf.sgotplt->output_section->vma
2587 + htab->elf.sgotplt->output_offset);
2588 }
2589
2590 break;
2591
2592 case R_386_GOTOFF:
2593 /* Relocation is relative to the start of the global offset
2594 table. */
2595
2596 /* Check to make sure it isn't a protected function or data
2597 symbol for shared library since it may not be local when
2598 used as function address or with copy relocation. We also
2599 need to make sure that a symbol is referenced locally. */
2600 if (!bfd_link_executable (info) && h)
2601 {
2602 if (!h->def_regular)
2603 {
2604 const char *v;
2605
2606 switch (ELF_ST_VISIBILITY (h->other))
2607 {
2608 case STV_HIDDEN:
2609 v = _("hidden symbol");
2610 break;
2611 case STV_INTERNAL:
2612 v = _("internal symbol");
2613 break;
2614 case STV_PROTECTED:
2615 v = _("protected symbol");
2616 break;
2617 default:
2618 v = _("symbol");
2619 break;
2620 }
2621
2622 _bfd_error_handler
2623 /* xgettext:c-format */
2624 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2625 " `%s' can not be used when making a shared object"),
2626 input_bfd, v, h->root.root.string);
2627 bfd_set_error (bfd_error_bad_value);
2628 return false;
2629 }
2630 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2631 && (h->type == STT_FUNC
2632 || h->type == STT_OBJECT)
2633 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2634 {
2635 _bfd_error_handler
2636 /* xgettext:c-format */
2637 (_("%pB: relocation R_386_GOTOFF against protected %s"
2638 " `%s' can not be used when making a shared object"),
2639 input_bfd,
2640 h->type == STT_FUNC ? "function" : "data",
2641 h->root.root.string);
2642 bfd_set_error (bfd_error_bad_value);
2643 return false;
2644 }
2645 }
2646
2647 /* Note that sgot is not involved in this
2648 calculation. We always want the start of .got.plt. If we
2649 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2650 permitted by the ABI, we might have to change this
2651 calculation. */
2652 relocation -= htab->elf.sgotplt->output_section->vma
2653 + htab->elf.sgotplt->output_offset;
2654 break;
2655
2656 case R_386_GOTPC:
2657 /* Use global offset table as symbol value. */
2658 relocation = htab->elf.sgotplt->output_section->vma
2659 + htab->elf.sgotplt->output_offset;
2660 unresolved_reloc = false;
2661 break;
2662
2663 case R_386_PLT32:
2664 /* Relocation is to the entry for this symbol in the
2665 procedure linkage table. */
2666
2667 /* Resolve a PLT32 reloc against a local symbol directly,
2668 without using the procedure linkage table. */
2669 if (h == NULL)
2670 break;
2671
2672 if ((h->plt.offset == (bfd_vma) -1
2673 && eh->plt_got.offset == (bfd_vma) -1)
2674 || htab->elf.splt == NULL)
2675 {
2676 /* We didn't make a PLT entry for this symbol. This
2677 happens when statically linking PIC code, or when
2678 using -Bsymbolic. */
2679 break;
2680 }
2681
2682 if (h->plt.offset != (bfd_vma) -1)
2683 {
2684 if (htab->plt_second != NULL)
2685 {
2686 resolved_plt = htab->plt_second;
2687 plt_offset = eh->plt_second.offset;
2688 }
2689 else
2690 {
2691 resolved_plt = htab->elf.splt;
2692 plt_offset = h->plt.offset;
2693 }
2694 }
2695 else
2696 {
2697 resolved_plt = htab->plt_got;
2698 plt_offset = eh->plt_got.offset;
2699 }
2700
2701 relocation = (resolved_plt->output_section->vma
2702 + resolved_plt->output_offset
2703 + plt_offset);
2704 unresolved_reloc = false;
2705 break;
2706
2707 case R_386_SIZE32:
2708 /* Set to symbol size. */
2709 relocation = st_size;
2710 /* Fall through. */
2711
2712 case R_386_32:
2713 case R_386_PC32:
2714 if ((input_section->flags & SEC_ALLOC) == 0
2715 || is_vxworks_tls)
2716 break;
2717
2718 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2719 sec, false,
2720 resolved_to_zero,
2721 (r_type == R_386_PC32)))
2722 {
2723 Elf_Internal_Rela outrel;
2724 bool skip, relocate;
2725 asection *sreloc;
2726
2727 /* When generating a shared object, these relocations
2728 are copied into the output file to be resolved at run
2729 time. */
2730
2731 skip = false;
2732 relocate = false;
2733
2734 outrel.r_offset =
2735 _bfd_elf_section_offset (output_bfd, info, input_section,
2736 rel->r_offset);
2737 if (outrel.r_offset == (bfd_vma) -1)
2738 skip = true;
2739 else if (outrel.r_offset == (bfd_vma) -2)
2740 skip = true, relocate = true;
2741 outrel.r_offset += (input_section->output_section->vma
2742 + input_section->output_offset);
2743
2744 if (skip)
2745 memset (&outrel, 0, sizeof outrel);
2746 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2747 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2748 else
2749 {
2750 /* This symbol is local, or marked to become local. */
2751 relocate = true;
2752 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2753
2754 if (htab->params->report_relative_reloc)
2755 _bfd_x86_elf_link_report_relative_reloc
2756 (info, input_section, h, sym, "R_386_RELATIVE",
2757 &outrel);
2758 }
2759
2760 sreloc = elf_section_data (input_section)->sreloc;
2761
2762 if (sreloc == NULL || sreloc->contents == NULL)
2763 {
2764 r = bfd_reloc_notsupported;
2765 goto check_relocation_error;
2766 }
2767
2768 elf_append_rel (output_bfd, sreloc, &outrel);
2769
2770 /* If this reloc is against an external symbol, we do
2771 not want to fiddle with the addend. Otherwise, we
2772 need to include the symbol value so that it becomes
2773 an addend for the dynamic reloc. */
2774 if (! relocate)
2775 continue;
2776 }
2777 break;
2778
2779 case R_386_TLS_IE:
2780 if (!bfd_link_executable (info))
2781 {
2782 Elf_Internal_Rela outrel;
2783 asection *sreloc;
2784
2785 outrel.r_offset = rel->r_offset
2786 + input_section->output_section->vma
2787 + input_section->output_offset;
2788 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2789
2790 if (htab->params->report_relative_reloc)
2791 _bfd_x86_elf_link_report_relative_reloc
2792 (info, input_section, h, sym, "R_386_RELATIVE",
2793 &outrel);
2794
2795 sreloc = elf_section_data (input_section)->sreloc;
2796 if (sreloc == NULL)
2797 abort ();
2798 elf_append_rel (output_bfd, sreloc, &outrel);
2799 }
2800 /* Fall through */
2801
2802 case R_386_TLS_GD:
2803 case R_386_TLS_GOTDESC:
2804 case R_386_TLS_DESC_CALL:
2805 case R_386_TLS_IE_32:
2806 case R_386_TLS_GOTIE:
2807 tls_type = GOT_UNKNOWN;
2808 if (h == NULL && local_got_offsets)
2809 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2810 else if (h != NULL)
2811 tls_type = elf_x86_hash_entry(h)->tls_type;
2812 if (tls_type == GOT_TLS_IE)
2813 tls_type = GOT_TLS_IE_NEG;
2814
2815 r_type_tls = r_type;
2816 if (! elf_i386_tls_transition (info, input_bfd,
2817 input_section, contents,
2818 symtab_hdr, sym_hashes,
2819 &r_type_tls, tls_type, rel,
2820 relend, h, r_symndx, true))
2821 return false;
2822
2823 if (r_type_tls == R_386_TLS_LE_32)
2824 {
2825 BFD_ASSERT (! unresolved_reloc);
2826 if (r_type == R_386_TLS_GD)
2827 {
2828 unsigned int type;
2829 bfd_vma roff;
2830
2831 /* GD->LE transition. */
2832 type = *(contents + rel->r_offset - 2);
2833 if (type == 0x04)
2834 {
2835 /* Change
2836 leal foo@tlsgd(,%ebx,1), %eax
2837 call ___tls_get_addr@PLT
2838 into:
2839 movl %gs:0, %eax
2840 subl $foo@tpoff, %eax
2841 (6 byte form of subl). */
2842 roff = rel->r_offset + 5;
2843 }
2844 else
2845 {
2846 /* Change
2847 leal foo@tlsgd(%ebx), %eax
2848 call ___tls_get_addr@PLT
2849 nop
2850 or
2851 leal foo@tlsgd(%reg), %eax
2852 call *___tls_get_addr@GOT(%reg)
2853 which may be converted to
2854 addr32 call ___tls_get_addr
2855 into:
2856 movl %gs:0, %eax; subl $foo@tpoff, %eax
2857 (6 byte form of subl). */
2858 roff = rel->r_offset + 6;
2859 }
2860 memcpy (contents + roff - 8,
2861 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2862 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2863 contents + roff);
2864 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2865 rel++;
2866 wrel++;
2867 continue;
2868 }
2869 else if (r_type == R_386_TLS_GOTDESC)
2870 {
2871 /* GDesc -> LE transition.
2872 It's originally something like:
2873 leal x@tlsdesc(%ebx), %eax
2874
2875 leal x@ntpoff, %eax
2876
2877 Registers other than %eax may be set up here. */
2878
2879 unsigned int val;
2880 bfd_vma roff;
2881
2882 roff = rel->r_offset;
2883 val = bfd_get_8 (input_bfd, contents + roff - 1);
2884
2885 /* Now modify the instruction as appropriate. */
2886 /* aoliva FIXME: remove the above and xor the byte
2887 below with 0x86. */
2888 bfd_put_8 (output_bfd, val ^ 0x86,
2889 contents + roff - 1);
2890 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2891 contents + roff);
2892 continue;
2893 }
2894 else if (r_type == R_386_TLS_DESC_CALL)
2895 {
2896 /* GDesc -> LE transition.
2897 It's originally:
2898 call *(%eax)
2899 Turn it into:
2900 xchg %ax,%ax */
2901
2902 bfd_vma roff;
2903
2904 roff = rel->r_offset;
2905 bfd_put_8 (output_bfd, 0x66, contents + roff);
2906 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2907 continue;
2908 }
2909 else if (r_type == R_386_TLS_IE)
2910 {
2911 unsigned int val;
2912
2913 /* IE->LE transition:
2914 Originally it can be one of:
2915 movl foo, %eax
2916 movl foo, %reg
2917 addl foo, %reg
2918 We change it into:
2919 movl $foo, %eax
2920 movl $foo, %reg
2921 addl $foo, %reg. */
2922 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2923 if (val == 0xa1)
2924 {
2925 /* movl foo, %eax. */
2926 bfd_put_8 (output_bfd, 0xb8,
2927 contents + rel->r_offset - 1);
2928 }
2929 else
2930 {
2931 unsigned int type;
2932
2933 type = bfd_get_8 (input_bfd,
2934 contents + rel->r_offset - 2);
2935 switch (type)
2936 {
2937 case 0x8b:
2938 /* movl */
2939 bfd_put_8 (output_bfd, 0xc7,
2940 contents + rel->r_offset - 2);
2941 bfd_put_8 (output_bfd,
2942 0xc0 | ((val >> 3) & 7),
2943 contents + rel->r_offset - 1);
2944 break;
2945 case 0x03:
2946 /* addl */
2947 bfd_put_8 (output_bfd, 0x81,
2948 contents + rel->r_offset - 2);
2949 bfd_put_8 (output_bfd,
2950 0xc0 | ((val >> 3) & 7),
2951 contents + rel->r_offset - 1);
2952 break;
2953 default:
2954 BFD_FAIL ();
2955 break;
2956 }
2957 }
2958 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2959 contents + rel->r_offset);
2960 continue;
2961 }
2962 else
2963 {
2964 unsigned int val, type;
2965
2966 /* {IE_32,GOTIE}->LE transition:
2967 Originally it can be one of:
2968 subl foo(%reg1), %reg2
2969 movl foo(%reg1), %reg2
2970 addl foo(%reg1), %reg2
2971 We change it into:
2972 subl $foo, %reg2
2973 movl $foo, %reg2 (6 byte form)
2974 addl $foo, %reg2. */
2975 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2976 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2977 if (type == 0x8b)
2978 {
2979 /* movl */
2980 bfd_put_8 (output_bfd, 0xc7,
2981 contents + rel->r_offset - 2);
2982 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2983 contents + rel->r_offset - 1);
2984 }
2985 else if (type == 0x2b)
2986 {
2987 /* subl */
2988 bfd_put_8 (output_bfd, 0x81,
2989 contents + rel->r_offset - 2);
2990 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2991 contents + rel->r_offset - 1);
2992 }
2993 else if (type == 0x03)
2994 {
2995 /* addl */
2996 bfd_put_8 (output_bfd, 0x81,
2997 contents + rel->r_offset - 2);
2998 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2999 contents + rel->r_offset - 1);
3000 }
3001 else
3002 BFD_FAIL ();
3003 if (r_type == R_386_TLS_GOTIE)
3004 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3005 contents + rel->r_offset);
3006 else
3007 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3008 contents + rel->r_offset);
3009 continue;
3010 }
3011 }
3012
3013 if (htab->elf.sgot == NULL)
3014 abort ();
3015
3016 if (h != NULL)
3017 {
3018 off = h->got.offset;
3019 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3020 }
3021 else
3022 {
3023 if (local_got_offsets == NULL)
3024 abort ();
3025
3026 off = local_got_offsets[r_symndx];
3027 offplt = local_tlsdesc_gotents[r_symndx];
3028 }
3029
3030 if ((off & 1) != 0)
3031 off &= ~1;
3032 else
3033 {
3034 Elf_Internal_Rela outrel;
3035 int dr_type;
3036 asection *sreloc;
3037
3038 if (htab->elf.srelgot == NULL)
3039 abort ();
3040
3041 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3042
3043 if (GOT_TLS_GDESC_P (tls_type))
3044 {
3045 bfd_byte *loc;
3046 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3047 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3048 <= htab->elf.sgotplt->size);
3049 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3050 + htab->elf.sgotplt->output_offset
3051 + offplt
3052 + htab->sgotplt_jump_table_size);
3053 sreloc = htab->elf.srelplt;
3054 loc = sreloc->contents;
3055 loc += (htab->next_tls_desc_index++
3056 * sizeof (Elf32_External_Rel));
3057 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3058 <= sreloc->contents + sreloc->size);
3059 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3060 if (indx == 0)
3061 {
3062 BFD_ASSERT (! unresolved_reloc);
3063 bfd_put_32 (output_bfd,
3064 relocation - _bfd_x86_elf_dtpoff_base (info),
3065 htab->elf.sgotplt->contents + offplt
3066 + htab->sgotplt_jump_table_size + 4);
3067 }
3068 else
3069 {
3070 bfd_put_32 (output_bfd, 0,
3071 htab->elf.sgotplt->contents + offplt
3072 + htab->sgotplt_jump_table_size + 4);
3073 }
3074 }
3075
3076 sreloc = htab->elf.srelgot;
3077
3078 outrel.r_offset = (htab->elf.sgot->output_section->vma
3079 + htab->elf.sgot->output_offset + off);
3080
3081 if (GOT_TLS_GD_P (tls_type))
3082 dr_type = R_386_TLS_DTPMOD32;
3083 else if (GOT_TLS_GDESC_P (tls_type))
3084 goto dr_done;
3085 else if (tls_type == GOT_TLS_IE_POS)
3086 dr_type = R_386_TLS_TPOFF;
3087 else
3088 dr_type = R_386_TLS_TPOFF32;
3089
3090 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3091 bfd_put_32 (output_bfd,
3092 relocation - _bfd_x86_elf_dtpoff_base (info),
3093 htab->elf.sgot->contents + off);
3094 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3095 bfd_put_32 (output_bfd,
3096 _bfd_x86_elf_dtpoff_base (info) - relocation,
3097 htab->elf.sgot->contents + off);
3098 else if (dr_type != R_386_TLS_DESC)
3099 bfd_put_32 (output_bfd, 0,
3100 htab->elf.sgot->contents + off);
3101 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3102
3103 elf_append_rel (output_bfd, sreloc, &outrel);
3104
3105 if (GOT_TLS_GD_P (tls_type))
3106 {
3107 if (indx == 0)
3108 {
3109 BFD_ASSERT (! unresolved_reloc);
3110 bfd_put_32 (output_bfd,
3111 relocation - _bfd_x86_elf_dtpoff_base (info),
3112 htab->elf.sgot->contents + off + 4);
3113 }
3114 else
3115 {
3116 bfd_put_32 (output_bfd, 0,
3117 htab->elf.sgot->contents + off + 4);
3118 outrel.r_info = ELF32_R_INFO (indx,
3119 R_386_TLS_DTPOFF32);
3120 outrel.r_offset += 4;
3121 elf_append_rel (output_bfd, sreloc, &outrel);
3122 }
3123 }
3124 else if (tls_type == GOT_TLS_IE_BOTH)
3125 {
3126 bfd_put_32 (output_bfd,
3127 (indx == 0
3128 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3129 : 0),
3130 htab->elf.sgot->contents + off + 4);
3131 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3132 outrel.r_offset += 4;
3133 elf_append_rel (output_bfd, sreloc, &outrel);
3134 }
3135
3136 dr_done:
3137 if (h != NULL)
3138 h->got.offset |= 1;
3139 else
3140 local_got_offsets[r_symndx] |= 1;
3141 }
3142
3143 if (off >= (bfd_vma) -2
3144 && ! GOT_TLS_GDESC_P (tls_type))
3145 abort ();
3146 if (r_type_tls == R_386_TLS_GOTDESC
3147 || r_type_tls == R_386_TLS_DESC_CALL)
3148 {
3149 relocation = htab->sgotplt_jump_table_size + offplt;
3150 unresolved_reloc = false;
3151 }
3152 else if (r_type_tls == r_type)
3153 {
3154 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3155 + htab->elf.sgotplt->output_offset;
3156 relocation = htab->elf.sgot->output_section->vma
3157 + htab->elf.sgot->output_offset + off - g_o_t;
3158 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3159 && tls_type == GOT_TLS_IE_BOTH)
3160 relocation += 4;
3161 if (r_type == R_386_TLS_IE)
3162 relocation += g_o_t;
3163 unresolved_reloc = false;
3164 }
3165 else if (r_type == R_386_TLS_GD)
3166 {
3167 unsigned int val, type;
3168 bfd_vma roff;
3169
3170 /* GD->IE transition. */
3171 type = *(contents + rel->r_offset - 2);
3172 val = *(contents + rel->r_offset - 1);
3173 if (type == 0x04)
3174 {
3175 /* Change
3176 leal foo@tlsgd(,%ebx,1), %eax
3177 call ___tls_get_addr@PLT
3178 into:
3179 movl %gs:0, %eax
3180 subl $foo@gottpoff(%ebx), %eax. */
3181 val >>= 3;
3182 roff = rel->r_offset - 3;
3183 }
3184 else
3185 {
3186 /* Change
3187 leal foo@tlsgd(%ebx), %eax
3188 call ___tls_get_addr@PLT
3189 nop
3190 or
3191 leal foo@tlsgd(%reg), %eax
3192 call *___tls_get_addr@GOT(%reg)
3193 which may be converted to
3194 addr32 call ___tls_get_addr
3195 into:
3196 movl %gs:0, %eax;
3197 subl $foo@gottpoff(%reg), %eax. */
3198 roff = rel->r_offset - 2;
3199 }
3200 memcpy (contents + roff,
3201 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3202 contents[roff + 7] = 0x80 | (val & 7);
3203 /* If foo is used only with foo@gotntpoff(%reg) and
3204 foo@indntpoff, but not with foo@gottpoff(%reg), change
3205 subl $foo@gottpoff(%reg), %eax
3206 into:
3207 addl $foo@gotntpoff(%reg), %eax. */
3208 if (tls_type == GOT_TLS_IE_POS)
3209 contents[roff + 6] = 0x03;
3210 bfd_put_32 (output_bfd,
3211 htab->elf.sgot->output_section->vma
3212 + htab->elf.sgot->output_offset + off
3213 - htab->elf.sgotplt->output_section->vma
3214 - htab->elf.sgotplt->output_offset,
3215 contents + roff + 8);
3216 /* Skip R_386_PLT32 and R_386_GOT32X. */
3217 rel++;
3218 wrel++;
3219 continue;
3220 }
3221 else if (r_type == R_386_TLS_GOTDESC)
3222 {
3223 /* GDesc -> IE transition.
3224 It's originally something like:
3225 leal x@tlsdesc(%ebx), %eax
3226
3227 Change it to:
3228 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3229 or:
3230 movl x@gottpoff(%ebx), %eax # before negl %eax
3231
3232 Registers other than %eax may be set up here. */
3233
3234 bfd_vma roff;
3235
3236 /* First, make sure it's a leal adding ebx to a 32-bit
3237 offset into any register, although it's probably
3238 almost always going to be eax. */
3239 roff = rel->r_offset;
3240
3241 /* Now modify the instruction as appropriate. */
3242 /* To turn a leal into a movl in the form we use it, it
3243 suffices to change the first byte from 0x8d to 0x8b.
3244 aoliva FIXME: should we decide to keep the leal, all
3245 we have to do is remove the statement below, and
3246 adjust the relaxation of R_386_TLS_DESC_CALL. */
3247 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3248
3249 if (tls_type == GOT_TLS_IE_BOTH)
3250 off += 4;
3251
3252 bfd_put_32 (output_bfd,
3253 htab->elf.sgot->output_section->vma
3254 + htab->elf.sgot->output_offset + off
3255 - htab->elf.sgotplt->output_section->vma
3256 - htab->elf.sgotplt->output_offset,
3257 contents + roff);
3258 continue;
3259 }
3260 else if (r_type == R_386_TLS_DESC_CALL)
3261 {
3262 /* GDesc -> IE transition.
3263 It's originally:
3264 call *(%eax)
3265
3266 Change it to:
3267 xchg %ax,%ax
3268 or
3269 negl %eax
3270 depending on how we transformed the TLS_GOTDESC above.
3271 */
3272
3273 bfd_vma roff;
3274
3275 roff = rel->r_offset;
3276
3277 /* Now modify the instruction as appropriate. */
3278 if (tls_type != GOT_TLS_IE_NEG)
3279 {
3280 /* xchg %ax,%ax */
3281 bfd_put_8 (output_bfd, 0x66, contents + roff);
3282 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3283 }
3284 else
3285 {
3286 /* negl %eax */
3287 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3288 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3289 }
3290
3291 continue;
3292 }
3293 else
3294 BFD_ASSERT (false);
3295 break;
3296
3297 case R_386_TLS_LDM:
3298 if (! elf_i386_tls_transition (info, input_bfd,
3299 input_section, contents,
3300 symtab_hdr, sym_hashes,
3301 &r_type, GOT_UNKNOWN, rel,
3302 relend, h, r_symndx, true))
3303 return false;
3304
3305 if (r_type != R_386_TLS_LDM)
3306 {
3307 /* LD->LE transition. Change
3308 leal foo@tlsldm(%ebx) %eax
3309 call ___tls_get_addr@PLT
3310 into:
3311 movl %gs:0, %eax
3312 nop
3313 leal 0(%esi,1), %esi
3314 or change
3315 leal foo@tlsldm(%reg) %eax
3316 call *___tls_get_addr@GOT(%reg)
3317 which may be converted to
3318 addr32 call ___tls_get_addr
3319 into:
3320 movl %gs:0, %eax
3321 leal 0(%esi), %esi */
3322 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3323 if (*(contents + rel->r_offset + 4) == 0xff
3324 || *(contents + rel->r_offset + 4) == 0x67)
3325 memcpy (contents + rel->r_offset - 2,
3326 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3327 else
3328 memcpy (contents + rel->r_offset - 2,
3329 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3330 /* Skip R_386_PC32/R_386_PLT32. */
3331 rel++;
3332 wrel++;
3333 continue;
3334 }
3335
3336 if (htab->elf.sgot == NULL)
3337 abort ();
3338
3339 off = htab->tls_ld_or_ldm_got.offset;
3340 if (off & 1)
3341 off &= ~1;
3342 else
3343 {
3344 Elf_Internal_Rela outrel;
3345
3346 if (htab->elf.srelgot == NULL)
3347 abort ();
3348
3349 outrel.r_offset = (htab->elf.sgot->output_section->vma
3350 + htab->elf.sgot->output_offset + off);
3351
3352 bfd_put_32 (output_bfd, 0,
3353 htab->elf.sgot->contents + off);
3354 bfd_put_32 (output_bfd, 0,
3355 htab->elf.sgot->contents + off + 4);
3356 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3357 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3358 htab->tls_ld_or_ldm_got.offset |= 1;
3359 }
3360 relocation = htab->elf.sgot->output_section->vma
3361 + htab->elf.sgot->output_offset + off
3362 - htab->elf.sgotplt->output_section->vma
3363 - htab->elf.sgotplt->output_offset;
3364 unresolved_reloc = false;
3365 break;
3366
3367 case R_386_TLS_LDO_32:
3368 if (!bfd_link_executable (info)
3369 || (input_section->flags & SEC_CODE) == 0)
3370 relocation -= _bfd_x86_elf_dtpoff_base (info);
3371 else
3372 /* When converting LDO to LE, we must negate. */
3373 relocation = -elf_i386_tpoff (info, relocation);
3374 break;
3375
3376 case R_386_TLS_LE_32:
3377 case R_386_TLS_LE:
3378 if (!bfd_link_executable (info))
3379 {
3380 Elf_Internal_Rela outrel;
3381 asection *sreloc;
3382
3383 outrel.r_offset = rel->r_offset
3384 + input_section->output_section->vma
3385 + input_section->output_offset;
3386 if (h != NULL && h->dynindx != -1)
3387 indx = h->dynindx;
3388 else
3389 indx = 0;
3390 if (r_type == R_386_TLS_LE_32)
3391 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3392 else
3393 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3394 sreloc = elf_section_data (input_section)->sreloc;
3395 if (sreloc == NULL)
3396 abort ();
3397 elf_append_rel (output_bfd, sreloc, &outrel);
3398 if (indx)
3399 continue;
3400 else if (r_type == R_386_TLS_LE_32)
3401 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3402 else
3403 relocation -= _bfd_x86_elf_dtpoff_base (info);
3404 }
3405 else if (r_type == R_386_TLS_LE_32)
3406 relocation = elf_i386_tpoff (info, relocation);
3407 else
3408 relocation = -elf_i386_tpoff (info, relocation);
3409 break;
3410
3411 default:
3412 break;
3413 }
3414
3415 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3416 because such sections are not SEC_ALLOC and thus ld.so will
3417 not process them. */
3418 if (unresolved_reloc
3419 && !((input_section->flags & SEC_DEBUGGING) != 0
3420 && h->def_dynamic)
3421 && _bfd_elf_section_offset (output_bfd, info, input_section,
3422 rel->r_offset) != (bfd_vma) -1)
3423 {
3424 _bfd_error_handler
3425 /* xgettext:c-format */
3426 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3427 input_bfd,
3428 input_section,
3429 (uint64_t) rel->r_offset,
3430 howto->name,
3431 h->root.root.string);
3432 return false;
3433 }
3434
3435 do_relocation:
3436 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3437 contents, rel->r_offset,
3438 relocation, 0);
3439
3440 check_relocation_error:
3441 if (r != bfd_reloc_ok)
3442 {
3443 const char *name;
3444
3445 if (h != NULL)
3446 name = h->root.root.string;
3447 else
3448 {
3449 name = bfd_elf_string_from_elf_section (input_bfd,
3450 symtab_hdr->sh_link,
3451 sym->st_name);
3452 if (name == NULL)
3453 return false;
3454 if (*name == '\0')
3455 name = bfd_section_name (sec);
3456 }
3457
3458 if (r == bfd_reloc_overflow)
3459 (*info->callbacks->reloc_overflow)
3460 (info, (h ? &h->root : NULL), name, howto->name,
3461 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3462 else
3463 {
3464 _bfd_error_handler
3465 /* xgettext:c-format */
3466 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3467 input_bfd, input_section,
3468 (uint64_t) rel->r_offset, name, (int) r);
3469 return false;
3470 }
3471 }
3472
3473 if (wrel != rel)
3474 *wrel = *rel;
3475 }
3476
3477 if (wrel != rel)
3478 {
3479 Elf_Internal_Shdr *rel_hdr;
3480 size_t deleted = rel - wrel;
3481
3482 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3483 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3484 if (rel_hdr->sh_size == 0)
3485 {
3486 /* It is too late to remove an empty reloc section. Leave
3487 one NONE reloc.
3488 ??? What is wrong with an empty section??? */
3489 rel_hdr->sh_size = rel_hdr->sh_entsize;
3490 deleted -= 1;
3491 }
3492 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3493 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3494 input_section->reloc_count -= deleted;
3495 }
3496
3497 return true;
3498 }
3499
3500 /* Finish up dynamic symbol handling. We set the contents of various
3501 dynamic sections here. */
3502
3503 static bool
3504 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3505 struct bfd_link_info *info,
3506 struct elf_link_hash_entry *h,
3507 Elf_Internal_Sym *sym)
3508 {
3509 struct elf_x86_link_hash_table *htab;
3510 unsigned plt_entry_size;
3511 struct elf_x86_link_hash_entry *eh;
3512 bool local_undefweak;
3513 bool use_plt_second;
3514
3515 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3516 if (htab == NULL)
3517 return false;
3518
3519 plt_entry_size = htab->plt.plt_entry_size;
3520
3521 /* Use the second PLT section only if there is .plt section. */
3522 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3523
3524 eh = (struct elf_x86_link_hash_entry *) h;
3525 if (eh->no_finish_dynamic_symbol)
3526 abort ();
3527
3528 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3529 resolved undefined weak symbols in executable so that their
3530 references have value 0 at run-time. */
3531 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3532
3533 if (h->plt.offset != (bfd_vma) -1)
3534 {
3535 bfd_vma plt_index, plt_offset;
3536 bfd_vma got_offset;
3537 Elf_Internal_Rela rel;
3538 bfd_byte *loc;
3539 asection *plt, *resolved_plt, *gotplt, *relplt;
3540
3541 /* When building a static executable, use .iplt, .igot.plt and
3542 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3543 if (htab->elf.splt != NULL)
3544 {
3545 plt = htab->elf.splt;
3546 gotplt = htab->elf.sgotplt;
3547 relplt = htab->elf.srelplt;
3548 }
3549 else
3550 {
3551 plt = htab->elf.iplt;
3552 gotplt = htab->elf.igotplt;
3553 relplt = htab->elf.irelplt;
3554 }
3555
3556 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3557
3558 /* Get the index in the procedure linkage table which
3559 corresponds to this symbol. This is the index of this symbol
3560 in all the symbols for which we are making plt entries. The
3561 first entry in the procedure linkage table is reserved.
3562
3563 Get the offset into the .got table of the entry that
3564 corresponds to this function. Each .got entry is 4 bytes.
3565 The first three are reserved.
3566
3567 For static executables, we don't reserve anything. */
3568
3569 if (plt == htab->elf.splt)
3570 {
3571 got_offset = (h->plt.offset / plt_entry_size
3572 - htab->plt.has_plt0);
3573 got_offset = (got_offset + 3) * 4;
3574 }
3575 else
3576 {
3577 got_offset = h->plt.offset / plt_entry_size;
3578 got_offset = got_offset * 4;
3579 }
3580
3581 /* Fill in the entry in the procedure linkage table and update
3582 the first slot. */
3583 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3584 plt_entry_size);
3585
3586 if (use_plt_second)
3587 {
3588 const bfd_byte *plt_entry;
3589 if (bfd_link_pic (info))
3590 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3591 else
3592 plt_entry = htab->non_lazy_plt->plt_entry;
3593 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3594 plt_entry, htab->non_lazy_plt->plt_entry_size);
3595
3596 resolved_plt = htab->plt_second;
3597 plt_offset = eh->plt_second.offset;
3598 }
3599 else
3600 {
3601 resolved_plt = plt;
3602 plt_offset = h->plt.offset;
3603 }
3604
3605 if (! bfd_link_pic (info))
3606 {
3607 bfd_put_32 (output_bfd,
3608 (gotplt->output_section->vma
3609 + gotplt->output_offset
3610 + got_offset),
3611 resolved_plt->contents + plt_offset
3612 + htab->plt.plt_got_offset);
3613
3614 if (htab->elf.target_os == is_vxworks)
3615 {
3616 int s, k, reloc_index;
3617
3618 /* Create the R_386_32 relocation referencing the GOT
3619 for this PLT entry. */
3620
3621 /* S: Current slot number (zero-based). */
3622 s = ((h->plt.offset - htab->plt.plt_entry_size)
3623 / htab->plt.plt_entry_size);
3624 /* K: Number of relocations for PLTResolve. */
3625 if (bfd_link_pic (info))
3626 k = PLTRESOLVE_RELOCS_SHLIB;
3627 else
3628 k = PLTRESOLVE_RELOCS;
3629 /* Skip the PLTresolve relocations, and the relocations for
3630 the other PLT slots. */
3631 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3632 loc = (htab->srelplt2->contents + reloc_index
3633 * sizeof (Elf32_External_Rel));
3634
3635 rel.r_offset = (plt->output_section->vma
3636 + plt->output_offset
3637 + h->plt.offset + 2),
3638 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3639 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3640
3641 /* Create the R_386_32 relocation referencing the beginning of
3642 the PLT for this GOT entry. */
3643 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3644 + htab->elf.sgotplt->output_offset
3645 + got_offset);
3646 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3647 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3648 loc + sizeof (Elf32_External_Rel));
3649 }
3650 }
3651 else
3652 {
3653 bfd_put_32 (output_bfd, got_offset,
3654 resolved_plt->contents + plt_offset
3655 + htab->plt.plt_got_offset);
3656 }
3657
3658 /* Fill in the entry in the global offset table. Leave the entry
3659 as zero for undefined weak symbol in PIE. No PLT relocation
3660 against undefined weak symbol in PIE. */
3661 if (!local_undefweak)
3662 {
3663 if (htab->plt.has_plt0)
3664 bfd_put_32 (output_bfd,
3665 (plt->output_section->vma
3666 + plt->output_offset
3667 + h->plt.offset
3668 + htab->lazy_plt->plt_lazy_offset),
3669 gotplt->contents + got_offset);
3670
3671 /* Fill in the entry in the .rel.plt section. */
3672 rel.r_offset = (gotplt->output_section->vma
3673 + gotplt->output_offset
3674 + got_offset);
3675 if (PLT_LOCAL_IFUNC_P (info, h))
3676 {
3677 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3678 h->root.root.string,
3679 h->root.u.def.section->owner);
3680
3681 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3682 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3683 in the .got.plt section. */
3684 bfd_put_32 (output_bfd,
3685 (h->root.u.def.value
3686 + h->root.u.def.section->output_section->vma
3687 + h->root.u.def.section->output_offset),
3688 gotplt->contents + got_offset);
3689 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3690
3691 if (htab->params->report_relative_reloc)
3692 _bfd_x86_elf_link_report_relative_reloc
3693 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3694
3695 /* R_386_IRELATIVE comes last. */
3696 plt_index = htab->next_irelative_index--;
3697 }
3698 else
3699 {
3700 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3701 plt_index = htab->next_jump_slot_index++;
3702 }
3703
3704 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3705 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3706
3707 /* Don't fill the second and third slots in PLT entry for
3708 static executables nor without PLT0. */
3709 if (plt == htab->elf.splt && htab->plt.has_plt0)
3710 {
3711 bfd_put_32 (output_bfd,
3712 plt_index * sizeof (Elf32_External_Rel),
3713 plt->contents + h->plt.offset
3714 + htab->lazy_plt->plt_reloc_offset);
3715 bfd_put_32 (output_bfd,
3716 - (h->plt.offset
3717 + htab->lazy_plt->plt_plt_offset + 4),
3718 (plt->contents + h->plt.offset
3719 + htab->lazy_plt->plt_plt_offset));
3720 }
3721 }
3722 }
3723 else if (eh->plt_got.offset != (bfd_vma) -1)
3724 {
3725 bfd_vma got_offset, plt_offset;
3726 asection *plt, *got, *gotplt;
3727 const bfd_byte *got_plt_entry;
3728
3729 /* Set the entry in the GOT procedure linkage table. */
3730 plt = htab->plt_got;
3731 got = htab->elf.sgot;
3732 gotplt = htab->elf.sgotplt;
3733 got_offset = h->got.offset;
3734
3735 if (got_offset == (bfd_vma) -1
3736 || plt == NULL
3737 || got == NULL
3738 || gotplt == NULL)
3739 abort ();
3740
3741 /* Fill in the entry in the GOT procedure linkage table. */
3742 if (! bfd_link_pic (info))
3743 {
3744 got_plt_entry = htab->non_lazy_plt->plt_entry;
3745 got_offset += got->output_section->vma + got->output_offset;
3746 }
3747 else
3748 {
3749 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3750 got_offset += (got->output_section->vma
3751 + got->output_offset
3752 - gotplt->output_section->vma
3753 - gotplt->output_offset);
3754 }
3755
3756 plt_offset = eh->plt_got.offset;
3757 memcpy (plt->contents + plt_offset, got_plt_entry,
3758 htab->non_lazy_plt->plt_entry_size);
3759 bfd_put_32 (output_bfd, got_offset,
3760 (plt->contents + plt_offset
3761 + htab->non_lazy_plt->plt_got_offset));
3762 }
3763
3764 if (!local_undefweak
3765 && !h->def_regular
3766 && (h->plt.offset != (bfd_vma) -1
3767 || eh->plt_got.offset != (bfd_vma) -1))
3768 {
3769 /* Mark the symbol as undefined, rather than as defined in
3770 the .plt section. Leave the value if there were any
3771 relocations where pointer equality matters (this is a clue
3772 for the dynamic linker, to make function pointer
3773 comparisons work between an application and shared
3774 library), otherwise set it to zero. If a function is only
3775 called from a binary, there is no need to slow down
3776 shared libraries because of that. */
3777 sym->st_shndx = SHN_UNDEF;
3778 if (!h->pointer_equality_needed)
3779 sym->st_value = 0;
3780 }
3781
3782 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3783
3784 /* Don't generate dynamic GOT relocation against undefined weak
3785 symbol in executable. */
3786 if (h->got.offset != (bfd_vma) -1
3787 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3788 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3789 && !local_undefweak)
3790 {
3791 Elf_Internal_Rela rel;
3792 asection *relgot = htab->elf.srelgot;
3793 const char *relative_reloc_name = NULL;
3794
3795 /* This symbol has an entry in the global offset table. Set it
3796 up. */
3797
3798 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3799 abort ();
3800
3801 rel.r_offset = (htab->elf.sgot->output_section->vma
3802 + htab->elf.sgot->output_offset
3803 + (h->got.offset & ~(bfd_vma) 1));
3804
3805 /* If this is a static link, or it is a -Bsymbolic link and the
3806 symbol is defined locally or was forced to be local because
3807 of a version file, we just want to emit a RELATIVE reloc.
3808 The entry in the global offset table will already have been
3809 initialized in the relocate_section function. */
3810 if (h->def_regular
3811 && h->type == STT_GNU_IFUNC)
3812 {
3813 if (h->plt.offset == (bfd_vma) -1)
3814 {
3815 /* STT_GNU_IFUNC is referenced without PLT. */
3816 if (htab->elf.splt == NULL)
3817 {
3818 /* use .rel[a].iplt section to store .got relocations
3819 in static executable. */
3820 relgot = htab->elf.irelplt;
3821 }
3822 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3823 {
3824 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3825 h->root.root.string,
3826 h->root.u.def.section->owner);
3827
3828 bfd_put_32 (output_bfd,
3829 (h->root.u.def.value
3830 + h->root.u.def.section->output_section->vma
3831 + h->root.u.def.section->output_offset),
3832 htab->elf.sgot->contents + h->got.offset);
3833 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3834 relative_reloc_name = "R_386_IRELATIVE";
3835 }
3836 else
3837 goto do_glob_dat;
3838 }
3839 else if (bfd_link_pic (info))
3840 {
3841 /* Generate R_386_GLOB_DAT. */
3842 goto do_glob_dat;
3843 }
3844 else
3845 {
3846 asection *plt;
3847 bfd_vma plt_offset;
3848
3849 if (!h->pointer_equality_needed)
3850 abort ();
3851
3852 /* For non-shared object, we can't use .got.plt, which
3853 contains the real function addres if we need pointer
3854 equality. We load the GOT entry with the PLT entry. */
3855 if (htab->plt_second != NULL)
3856 {
3857 plt = htab->plt_second;
3858 plt_offset = eh->plt_second.offset;
3859 }
3860 else
3861 {
3862 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3863 plt_offset = h->plt.offset;
3864 }
3865 bfd_put_32 (output_bfd,
3866 (plt->output_section->vma
3867 + plt->output_offset + plt_offset),
3868 htab->elf.sgot->contents + h->got.offset);
3869 return true;
3870 }
3871 }
3872 else if (bfd_link_pic (info)
3873 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3874 {
3875 BFD_ASSERT((h->got.offset & 1) != 0);
3876 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3877 relative_reloc_name = "R_386_RELATIVE";
3878 }
3879 else
3880 {
3881 BFD_ASSERT((h->got.offset & 1) == 0);
3882 do_glob_dat:
3883 bfd_put_32 (output_bfd, (bfd_vma) 0,
3884 htab->elf.sgot->contents + h->got.offset);
3885 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3886 }
3887
3888 if (relative_reloc_name != NULL
3889 && htab->params->report_relative_reloc)
3890 _bfd_x86_elf_link_report_relative_reloc
3891 (info, relgot, h, sym, relative_reloc_name, &rel);
3892
3893 elf_append_rel (output_bfd, relgot, &rel);
3894 }
3895
3896 if (h->needs_copy)
3897 {
3898 Elf_Internal_Rela rel;
3899 asection *s;
3900
3901 /* This symbol needs a copy reloc. Set it up. */
3902 VERIFY_COPY_RELOC (h, htab)
3903
3904 rel.r_offset = (h->root.u.def.value
3905 + h->root.u.def.section->output_section->vma
3906 + h->root.u.def.section->output_offset);
3907 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3908 if (h->root.u.def.section == htab->elf.sdynrelro)
3909 s = htab->elf.sreldynrelro;
3910 else
3911 s = htab->elf.srelbss;
3912 elf_append_rel (output_bfd, s, &rel);
3913 }
3914
3915 return true;
3916 }
3917
3918 /* Finish up local dynamic symbol handling. We set the contents of
3919 various dynamic sections here. */
3920
3921 static int
3922 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3923 {
3924 struct elf_link_hash_entry *h
3925 = (struct elf_link_hash_entry *) *slot;
3926 struct bfd_link_info *info
3927 = (struct bfd_link_info *) inf;
3928
3929 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3930 h, NULL);
3931 }
3932
3933 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3934 here since undefined weak symbol may not be dynamic and may not be
3935 called for elf_i386_finish_dynamic_symbol. */
3936
3937 static bool
3938 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3939 void *inf)
3940 {
3941 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3942 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3943
3944 if (h->root.type != bfd_link_hash_undefweak
3945 || h->dynindx != -1)
3946 return true;
3947
3948 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3949 info, h, NULL);
3950 }
3951
3952 /* Used to decide how to sort relocs in an optimal manner for the
3953 dynamic linker, before writing them out. */
3954
3955 static enum elf_reloc_type_class
3956 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3957 const asection *rel_sec ATTRIBUTE_UNUSED,
3958 const Elf_Internal_Rela *rela)
3959 {
3960 bfd *abfd = info->output_bfd;
3961 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3962 struct elf_link_hash_table *htab = elf_hash_table (info);
3963
3964 if (htab->dynsym != NULL
3965 && htab->dynsym->contents != NULL)
3966 {
3967 /* Check relocation against STT_GNU_IFUNC symbol if there are
3968 dynamic symbols. */
3969 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3970 if (r_symndx != STN_UNDEF)
3971 {
3972 Elf_Internal_Sym sym;
3973 if (!bed->s->swap_symbol_in (abfd,
3974 (htab->dynsym->contents
3975 + r_symndx * sizeof (Elf32_External_Sym)),
3976 0, &sym))
3977 abort ();
3978
3979 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3980 return reloc_class_ifunc;
3981 }
3982 }
3983
3984 switch (ELF32_R_TYPE (rela->r_info))
3985 {
3986 case R_386_IRELATIVE:
3987 return reloc_class_ifunc;
3988 case R_386_RELATIVE:
3989 return reloc_class_relative;
3990 case R_386_JUMP_SLOT:
3991 return reloc_class_plt;
3992 case R_386_COPY:
3993 return reloc_class_copy;
3994 default:
3995 return reloc_class_normal;
3996 }
3997 }
3998
3999 /* Finish up the dynamic sections. */
4000
4001 static bool
4002 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4003 struct bfd_link_info *info)
4004 {
4005 struct elf_x86_link_hash_table *htab;
4006
4007 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4008 if (htab == NULL)
4009 return false;
4010
4011 if (!htab->elf.dynamic_sections_created)
4012 return true;
4013
4014 if (htab->elf.splt && htab->elf.splt->size > 0)
4015 {
4016 if (bfd_is_abs_section (htab->elf.splt->output_section))
4017 {
4018 info->callbacks->einfo
4019 (_("%F%P: discarded output section: `%pA'\n"),
4020 htab->elf.splt);
4021 return false;
4022 }
4023
4024 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4025 really seem like the right value. */
4026 elf_section_data (htab->elf.splt->output_section)
4027 ->this_hdr.sh_entsize = 4;
4028
4029 if (htab->plt.has_plt0)
4030 {
4031 /* Fill in the special first entry in the procedure linkage
4032 table. */
4033 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4034 htab->lazy_plt->plt0_entry_size);
4035 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4036 htab->plt0_pad_byte,
4037 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4038 if (!bfd_link_pic (info))
4039 {
4040 bfd_put_32 (output_bfd,
4041 (htab->elf.sgotplt->output_section->vma
4042 + htab->elf.sgotplt->output_offset
4043 + 4),
4044 htab->elf.splt->contents
4045 + htab->lazy_plt->plt0_got1_offset);
4046 bfd_put_32 (output_bfd,
4047 (htab->elf.sgotplt->output_section->vma
4048 + htab->elf.sgotplt->output_offset
4049 + 8),
4050 htab->elf.splt->contents
4051 + htab->lazy_plt->plt0_got2_offset);
4052
4053 if (htab->elf.target_os == is_vxworks)
4054 {
4055 Elf_Internal_Rela rel;
4056 int num_plts = (htab->elf.splt->size
4057 / htab->plt.plt_entry_size) - 1;
4058 unsigned char *p;
4059 asection *srelplt2 = htab->srelplt2;
4060
4061 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4062 + 4. On IA32 we use REL relocations so the
4063 addend goes in the PLT directly. */
4064 rel.r_offset = (htab->elf.splt->output_section->vma
4065 + htab->elf.splt->output_offset
4066 + htab->lazy_plt->plt0_got1_offset);
4067 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4068 R_386_32);
4069 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4070 srelplt2->contents);
4071 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4072 + 8. */
4073 rel.r_offset = (htab->elf.splt->output_section->vma
4074 + htab->elf.splt->output_offset
4075 + htab->lazy_plt->plt0_got2_offset);
4076 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4077 R_386_32);
4078 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4079 srelplt2->contents +
4080 sizeof (Elf32_External_Rel));
4081 /* Correct the .rel.plt.unloaded relocations. */
4082 p = srelplt2->contents;
4083 if (bfd_link_pic (info))
4084 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4085 else
4086 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4087
4088 for (; num_plts; num_plts--)
4089 {
4090 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4091 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4092 R_386_32);
4093 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4094 p += sizeof (Elf32_External_Rel);
4095
4096 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4097 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4098 R_386_32);
4099 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4100 p += sizeof (Elf32_External_Rel);
4101 }
4102 }
4103 }
4104 }
4105 }
4106
4107 /* Fill PLT entries for undefined weak symbols in PIE. */
4108 if (bfd_link_pie (info))
4109 bfd_hash_traverse (&info->hash->table,
4110 elf_i386_pie_finish_undefweak_symbol,
4111 info);
4112
4113 return true;
4114 }
4115
4116 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4117 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4118 It has to be done before elf_link_sort_relocs is called so that
4119 dynamic relocations are properly sorted. */
4120
4121 static bool
4122 elf_i386_output_arch_local_syms
4123 (bfd *output_bfd ATTRIBUTE_UNUSED,
4124 struct bfd_link_info *info,
4125 void *flaginfo ATTRIBUTE_UNUSED,
4126 int (*func) (void *, const char *,
4127 Elf_Internal_Sym *,
4128 asection *,
4129 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4130 {
4131 struct elf_x86_link_hash_table *htab
4132 = elf_x86_hash_table (info, I386_ELF_DATA);
4133 if (htab == NULL)
4134 return false;
4135
4136 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4137 htab_traverse (htab->loc_hash_table,
4138 elf_i386_finish_local_dynamic_symbol,
4139 info);
4140
4141 return true;
4142 }
4143
4144 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4145 dynamic relocations. */
4146
4147 static long
4148 elf_i386_get_synthetic_symtab (bfd *abfd,
4149 long symcount ATTRIBUTE_UNUSED,
4150 asymbol **syms ATTRIBUTE_UNUSED,
4151 long dynsymcount,
4152 asymbol **dynsyms,
4153 asymbol **ret)
4154 {
4155 long count, i, n;
4156 int j;
4157 bfd_byte *plt_contents;
4158 long relsize;
4159 const struct elf_x86_lazy_plt_layout *lazy_plt;
4160 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4161 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4162 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4163 asection *plt;
4164 bfd_vma got_addr;
4165 enum elf_x86_plt_type plt_type;
4166 struct elf_x86_plt plts[] =
4167 {
4168 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4169 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4170 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4171 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4172 };
4173
4174 *ret = NULL;
4175
4176 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4177 return 0;
4178
4179 if (dynsymcount <= 0)
4180 return 0;
4181
4182 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4183 if (relsize <= 0)
4184 return -1;
4185
4186 non_lazy_plt = NULL;
4187 /* Silence GCC 6. */
4188 lazy_plt = NULL;
4189 non_lazy_ibt_plt = NULL;
4190 lazy_ibt_plt = NULL;
4191 switch (get_elf_backend_data (abfd)->target_os)
4192 {
4193 case is_normal:
4194 case is_solaris:
4195 non_lazy_plt = &elf_i386_non_lazy_plt;
4196 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4197 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4198 /* Fall through */
4199 case is_vxworks:
4200 lazy_plt = &elf_i386_lazy_plt;
4201 break;
4202 default:
4203 abort ();
4204 }
4205
4206 got_addr = 0;
4207
4208 count = 0;
4209 for (j = 0; plts[j].name != NULL; j++)
4210 {
4211 plt = bfd_get_section_by_name (abfd, plts[j].name);
4212 if (plt == NULL || plt->size == 0)
4213 continue;
4214
4215 /* Get the PLT section contents. */
4216 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4217 if (plt_contents == NULL)
4218 break;
4219 if (!bfd_get_section_contents (abfd, (asection *) plt,
4220 plt_contents, 0, plt->size))
4221 {
4222 free (plt_contents);
4223 break;
4224 }
4225
4226 /* Check what kind of PLT it is. */
4227 plt_type = plt_unknown;
4228 if (plts[j].type == plt_unknown
4229 && (plt->size >= (lazy_plt->plt0_entry_size
4230 + lazy_plt->plt_entry_size)))
4231 {
4232 /* Match lazy PLT first. */
4233 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4234 lazy_plt->plt0_got1_offset) == 0)
4235 {
4236 /* The fist entry in the lazy IBT PLT is the same as the
4237 normal lazy PLT. */
4238 if (lazy_ibt_plt != NULL
4239 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4240 lazy_ibt_plt->plt_entry,
4241 lazy_ibt_plt->plt_got_offset) == 0))
4242 plt_type = plt_lazy | plt_second;
4243 else
4244 plt_type = plt_lazy;
4245 }
4246 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4247 lazy_plt->plt0_got1_offset) == 0)
4248 {
4249 /* The fist entry in the PIC lazy IBT PLT is the same as
4250 the normal PIC lazy PLT. */
4251 if (lazy_ibt_plt != NULL
4252 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4253 lazy_ibt_plt->pic_plt_entry,
4254 lazy_ibt_plt->plt_got_offset) == 0))
4255 plt_type = plt_lazy | plt_pic | plt_second;
4256 else
4257 plt_type = plt_lazy | plt_pic;
4258 }
4259 }
4260
4261 if (non_lazy_plt != NULL
4262 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4263 && plt->size >= non_lazy_plt->plt_entry_size)
4264 {
4265 /* Match non-lazy PLT. */
4266 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4267 non_lazy_plt->plt_got_offset) == 0)
4268 plt_type = plt_non_lazy;
4269 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4270 non_lazy_plt->plt_got_offset) == 0)
4271 plt_type = plt_pic;
4272 }
4273
4274 if ((non_lazy_ibt_plt != NULL)
4275 && (plt_type == plt_unknown || plt_type == plt_second)
4276 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4277 {
4278 if (memcmp (plt_contents,
4279 non_lazy_ibt_plt->plt_entry,
4280 non_lazy_ibt_plt->plt_got_offset) == 0)
4281 {
4282 /* Match IBT PLT. */
4283 plt_type = plt_second;
4284 non_lazy_plt = non_lazy_ibt_plt;
4285 }
4286 else if (memcmp (plt_contents,
4287 non_lazy_ibt_plt->pic_plt_entry,
4288 non_lazy_ibt_plt->plt_got_offset) == 0)
4289 {
4290 /* Match PIC IBT PLT. */
4291 plt_type = plt_second | plt_pic;
4292 non_lazy_plt = non_lazy_ibt_plt;
4293 }
4294 }
4295
4296 if (plt_type == plt_unknown)
4297 {
4298 free (plt_contents);
4299 continue;
4300 }
4301
4302 plts[j].sec = plt;
4303 plts[j].type = plt_type;
4304
4305 if ((plt_type & plt_lazy))
4306 {
4307 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4308 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4309 /* Skip PLT0 in lazy PLT. */
4310 i = 1;
4311 }
4312 else
4313 {
4314 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4315 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4316 i = 0;
4317 }
4318
4319 /* Skip lazy PLT when the second PLT is used. */
4320 if ((plt_type & (plt_lazy | plt_second))
4321 == (plt_lazy | plt_second))
4322 plts[j].count = 0;
4323 else
4324 {
4325 n = plt->size / plts[j].plt_entry_size;
4326 plts[j].count = n;
4327 count += n - i;
4328 }
4329
4330 plts[j].contents = plt_contents;
4331
4332 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4333 if ((plt_type & plt_pic))
4334 got_addr = (bfd_vma) -1;
4335 }
4336
4337 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4338 got_addr, plts, dynsyms,
4339 ret);
4340 }
4341
4342 /* Set up i386 GNU properties. Return the first relocatable ELF input
4343 with GNU properties if found. Otherwise, return NULL. */
4344
4345 static bfd *
4346 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4347 {
4348 struct elf_x86_init_table init_table;
4349
4350 switch (get_elf_backend_data (info->output_bfd)->target_os)
4351 {
4352 case is_normal:
4353 case is_solaris:
4354 init_table.plt0_pad_byte = 0x0;
4355 init_table.lazy_plt = &elf_i386_lazy_plt;
4356 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4357 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4358 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4359 break;
4360 case is_vxworks:
4361 init_table.plt0_pad_byte = 0x90;
4362 init_table.lazy_plt = &elf_i386_lazy_plt;
4363 init_table.non_lazy_plt = NULL;
4364 init_table.lazy_ibt_plt = NULL;
4365 init_table.non_lazy_ibt_plt = NULL;
4366 break;
4367 default:
4368 abort ();
4369 }
4370
4371 init_table.r_info = elf32_r_info;
4372 init_table.r_sym = elf32_r_sym;
4373
4374 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4375 }
4376
4377 #define TARGET_LITTLE_SYM i386_elf32_vec
4378 #define TARGET_LITTLE_NAME "elf32-i386"
4379 #define ELF_ARCH bfd_arch_i386
4380 #define ELF_TARGET_ID I386_ELF_DATA
4381 #define ELF_MACHINE_CODE EM_386
4382 #define ELF_MAXPAGESIZE 0x1000
4383
4384 #define elf_backend_can_gc_sections 1
4385 #define elf_backend_can_refcount 1
4386 #define elf_backend_want_got_plt 1
4387 #define elf_backend_plt_readonly 1
4388 #define elf_backend_want_plt_sym 0
4389 #define elf_backend_got_header_size 12
4390 #define elf_backend_plt_alignment 4
4391 #define elf_backend_dtrel_excludes_plt 1
4392 #define elf_backend_extern_protected_data 1
4393 #define elf_backend_caches_rawsize 1
4394 #define elf_backend_want_dynrelro 1
4395
4396 /* Support RELA for objdump of prelink objects. */
4397 #define elf_info_to_howto elf_i386_info_to_howto_rel
4398 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4399
4400 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4401 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4402 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4403 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4404
4405 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4406 #define elf_backend_check_relocs elf_i386_check_relocs
4407 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4408 #define elf_backend_fake_sections elf_i386_fake_sections
4409 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4410 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4411 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4412 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4413 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4414 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4415 #define elf_backend_relocate_section elf_i386_relocate_section
4416 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4417 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4418
4419 #define elf_backend_linux_prpsinfo32_ugid16 true
4420
4421 #define elf32_bed elf32_i386_bed
4422
4423 #include "elf32-target.h"
4424
4425 /* FreeBSD support. */
4426
4427 #undef TARGET_LITTLE_SYM
4428 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4429 #undef TARGET_LITTLE_NAME
4430 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4431 #undef ELF_OSABI
4432 #define ELF_OSABI ELFOSABI_FREEBSD
4433
4434 /* The kernel recognizes executables as valid only if they carry a
4435 "FreeBSD" label in the ELF header. So we put this label on all
4436 executables and (for simplicity) also all other object files. */
4437
4438 static bool
4439 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4440 {
4441 if (!_bfd_elf_init_file_header (abfd, info))
4442 return false;
4443
4444 #ifdef OLD_FREEBSD_ABI_LABEL
4445 {
4446 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4447 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4448 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4449 }
4450 #endif
4451 return true;
4452 }
4453
4454 #undef elf_backend_init_file_header
4455 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4456 #undef elf32_bed
4457 #define elf32_bed elf32_i386_fbsd_bed
4458
4459 #undef elf_backend_add_symbol_hook
4460
4461 #include "elf32-target.h"
4462
4463 #undef elf_backend_init_file_header
4464
4465 /* Solaris 2. */
4466
4467 #undef TARGET_LITTLE_SYM
4468 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4469 #undef TARGET_LITTLE_NAME
4470 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4471
4472 #undef ELF_TARGET_OS
4473 #define ELF_TARGET_OS is_solaris
4474
4475 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4476 objects won't be recognized. */
4477 #undef ELF_OSABI
4478
4479 #undef elf32_bed
4480 #define elf32_bed elf32_i386_sol2_bed
4481
4482 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4483 boundary. */
4484 #undef elf_backend_static_tls_alignment
4485 #define elf_backend_static_tls_alignment 8
4486
4487 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4488
4489 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4490 File, p.63. */
4491 #undef elf_backend_want_plt_sym
4492 #define elf_backend_want_plt_sym 1
4493
4494 #undef elf_backend_strtab_flags
4495 #define elf_backend_strtab_flags SHF_STRINGS
4496
4497 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4498 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4499 FALSE otherwise. ISECTION is the best guess matching section from the
4500 input bfd IBFD, but it might be NULL. */
4501
4502 static bool
4503 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4504 bfd *obfd ATTRIBUTE_UNUSED,
4505 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4506 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4507 {
4508 /* PR 19938: FIXME: Need to add code for setting the sh_info
4509 and sh_link fields of Solaris specific section types. */
4510 return false;
4511
4512 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4513 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4514
4515 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4516
4517 The following values should be set:
4518
4519 Type Link Info
4520 -----------------------------------------------------------------------------
4521 SHT_SUNW_ancillary The section header index of 0
4522 [0x6fffffee] the associated string table.
4523
4524 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4525 [0x6ffffff0] the associated symbol table. section header index of
4526 the associated
4527 SHT_SUNW_capchain table,
4528 otherwise 0.
4529
4530 SHT_SUNW_symsort The section header index of 0
4531 [0x6ffffff1] the associated symbol table.
4532
4533 SHT_SUNW_tlssort The section header index of 0
4534 [0x6ffffff2] the associated symbol table.
4535
4536 SHT_SUNW_LDYNSYM The section header index of One greater than the
4537 [0x6ffffff3] the associated string table. symbol table index of the
4538 This index is the same string last local symbol,
4539 table used by the SHT_DYNSYM STB_LOCAL. Since
4540 section. SHT_SUNW_LDYNSYM only
4541 contains local symbols,
4542 sh_info is equivalent to
4543 the number of symbols in
4544 the table.
4545
4546 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4547 [0x6ffffff5] the section header index of to named strings, the
4548 the associated section header index of
4549 SHT_SUNW_capinfo table, the associated string
4550 otherwise 0. table, otherwise 0.
4551
4552 SHT_SUNW_move The section header index of 0
4553 [0x6ffffffa] the associated symbol table.
4554
4555 SHT_SUNW_COMDAT 0 0
4556 [0x6ffffffb]
4557
4558 SHT_SUNW_syminfo The section header index of The section header index
4559 [0x6ffffffc] the associated symbol table. of the associated
4560 .dynamic section.
4561
4562 SHT_SUNW_verdef The section header index of The number of version
4563 [0x6ffffffd] the associated string table. definitions within the
4564 section.
4565
4566 SHT_SUNW_verneed The section header index of The number of version
4567 [0x6ffffffe] the associated string table. dependencies within the
4568 section.
4569
4570 SHT_SUNW_versym The section header index of 0
4571 [0x6fffffff] the associated symbol table. */
4572 }
4573
4574 #undef elf_backend_copy_special_section_fields
4575 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4576
4577 #include "elf32-target.h"
4578
4579 /* Intel MCU support. */
4580
4581 static bool
4582 elf32_iamcu_elf_object_p (bfd *abfd)
4583 {
4584 /* Set the right machine number for an IAMCU elf32 file. */
4585 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4586 return true;
4587 }
4588
4589 #undef TARGET_LITTLE_SYM
4590 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4591 #undef TARGET_LITTLE_NAME
4592 #define TARGET_LITTLE_NAME "elf32-iamcu"
4593 #undef ELF_ARCH
4594 #define ELF_ARCH bfd_arch_iamcu
4595
4596 #undef ELF_MACHINE_CODE
4597 #define ELF_MACHINE_CODE EM_IAMCU
4598
4599 #undef ELF_TARGET_OS
4600 #undef ELF_OSABI
4601
4602 #undef elf32_bed
4603 #define elf32_bed elf32_iamcu_bed
4604
4605 #undef elf_backend_object_p
4606 #define elf_backend_object_p elf32_iamcu_elf_object_p
4607
4608 #undef elf_backend_static_tls_alignment
4609
4610 #undef elf_backend_want_plt_sym
4611 #define elf_backend_want_plt_sym 0
4612
4613 #undef elf_backend_strtab_flags
4614 #undef elf_backend_copy_special_section_fields
4615
4616 #include "elf32-target.h"
4617
4618 /* Restore defaults. */
4619 #undef ELF_ARCH
4620 #define ELF_ARCH bfd_arch_i386
4621 #undef ELF_MACHINE_CODE
4622 #define ELF_MACHINE_CODE EM_386
4623 #undef elf_backend_object_p
4624
4625 /* VxWorks support. */
4626
4627 #undef TARGET_LITTLE_SYM
4628 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4629 #undef TARGET_LITTLE_NAME
4630 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4631 #undef ELF_OSABI
4632 #undef ELF_MAXPAGESIZE
4633 #define ELF_MAXPAGESIZE 0x1000
4634 #undef elf_backend_plt_alignment
4635 #define elf_backend_plt_alignment 4
4636
4637 #undef ELF_TARGET_OS
4638 #define ELF_TARGET_OS is_vxworks
4639
4640 #undef elf_backend_relocs_compatible
4641 #undef elf_backend_add_symbol_hook
4642 #define elf_backend_add_symbol_hook \
4643 elf_vxworks_add_symbol_hook
4644 #undef elf_backend_link_output_symbol_hook
4645 #define elf_backend_link_output_symbol_hook \
4646 elf_vxworks_link_output_symbol_hook
4647 #undef elf_backend_emit_relocs
4648 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4649 #undef elf_backend_final_write_processing
4650 #define elf_backend_final_write_processing \
4651 elf_vxworks_final_write_processing
4652 #undef elf_backend_static_tls_alignment
4653
4654 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4655 define it. */
4656 #undef elf_backend_want_plt_sym
4657 #define elf_backend_want_plt_sym 1
4658
4659 #undef elf32_bed
4660 #define elf32_bed elf32_i386_vxworks_bed
4661
4662 #include "elf32-target.h"
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