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[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 #include "elf/i386.h"
30
31 static reloc_howto_type elf_howto_table[]=
32 {
33 HOWTO(R_386_NONE, 0, 3, 0, false, 0, complain_overflow_dont,
34 bfd_elf_generic_reloc, "R_386_NONE",
35 true, 0x00000000, 0x00000000, false),
36 HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_dont,
37 bfd_elf_generic_reloc, "R_386_32",
38 true, 0xffffffff, 0xffffffff, false),
39 HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_dont,
40 bfd_elf_generic_reloc, "R_386_PC32",
41 true, 0xffffffff, 0xffffffff, true),
42 HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_dont,
43 bfd_elf_generic_reloc, "R_386_GOT32",
44 true, 0xffffffff, 0xffffffff, false),
45 HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_dont,
46 bfd_elf_generic_reloc, "R_386_PLT32",
47 true, 0xffffffff, 0xffffffff, true),
48 HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_386_COPY",
50 true, 0xffffffff, 0xffffffff, false),
51 HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_dont,
52 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
53 true, 0xffffffff, 0xffffffff, false),
54 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_dont,
55 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
56 true, 0xffffffff, 0xffffffff, false),
57 HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_386_RELATIVE",
59 true, 0xffffffff, 0xffffffff, false),
60 HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_dont,
61 bfd_elf_generic_reloc, "R_386_GOTOFF",
62 true, 0xffffffff, 0xffffffff, false),
63 HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_dont,
64 bfd_elf_generic_reloc, "R_386_GOTPC",
65 true, 0xffffffff, 0xffffffff, true),
66
67 /* We have a gap in the reloc numbers here.
68 R_386_standard counts the number up to this point, and
69 R_386_ext_offset is the value to subtract from a reloc type of
70 R_386_16 thru R_386_PC8 to form an index into this table. */
71 #define R_386_standard (R_386_GOTPC + 1)
72 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
73
74 /* These relocs are a GNU extension. */
75 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, false, 0, complain_overflow_dont,
76 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
77 true, 0xffffffff, 0xffffffff, false),
78 HOWTO(R_386_TLS_IE, 0, 2, 32, false, 0, complain_overflow_dont,
79 bfd_elf_generic_reloc, "R_386_TLS_IE",
80 true, 0xffffffff, 0xffffffff, false),
81 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, false, 0, complain_overflow_dont,
82 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
83 true, 0xffffffff, 0xffffffff, false),
84 HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_dont,
85 bfd_elf_generic_reloc, "R_386_TLS_LE",
86 true, 0xffffffff, 0xffffffff, false),
87 HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_dont,
88 bfd_elf_generic_reloc, "R_386_TLS_GD",
89 true, 0xffffffff, 0xffffffff, false),
90 HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_dont,
91 bfd_elf_generic_reloc, "R_386_TLS_LDM",
92 true, 0xffffffff, 0xffffffff, false),
93 HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_16",
95 true, 0xffff, 0xffff, false),
96 HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_PC16",
98 true, 0xffff, 0xffff, true),
99 HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_8",
101 true, 0xff, 0xff, false),
102 HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
103 bfd_elf_generic_reloc, "R_386_PC8",
104 true, 0xff, 0xff, true),
105
106 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
107 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
108 /* These are common with Solaris TLS implementation. */
109 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_dont,
110 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
111 true, 0xffffffff, 0xffffffff, false),
112 HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_dont,
113 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
114 true, 0xffffffff, 0xffffffff, false),
115 HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_dont,
116 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
117 true, 0xffffffff, 0xffffffff, false),
118 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
120 true, 0xffffffff, 0xffffffff, false),
121 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
122 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
123 true, 0xffffffff, 0xffffffff, false),
124 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
125 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
126 true, 0xffffffff, 0xffffffff, false),
127 HOWTO(R_386_SIZE32, 0, 2, 32, false, 0, complain_overflow_dont,
128 bfd_elf_generic_reloc, "R_386_SIZE32",
129 true, 0xffffffff, 0xffffffff, false),
130 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, false, 0, complain_overflow_dont,
131 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
132 true, 0xffffffff, 0xffffffff, false),
133 HOWTO(R_386_TLS_DESC_CALL, 0, 3, 0, false, 0, complain_overflow_dont,
134 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
135 false, 0, 0, false),
136 HOWTO(R_386_TLS_DESC, 0, 2, 32, false, 0, complain_overflow_dont,
137 bfd_elf_generic_reloc, "R_386_TLS_DESC",
138 true, 0xffffffff, 0xffffffff, false),
139 HOWTO(R_386_IRELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
140 bfd_elf_generic_reloc, "R_386_IRELATIVE",
141 true, 0xffffffff, 0xffffffff, false),
142 HOWTO(R_386_GOT32X, 0, 2, 32, false, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_GOT32X",
144 true, 0xffffffff, 0xffffffff, false),
145
146 /* Another gap. */
147 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
148 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
149
150 /* GNU extension to record C++ vtable hierarchy. */
151 HOWTO (R_386_GNU_VTINHERIT, /* type */
152 0, /* rightshift */
153 2, /* size (0 = byte, 1 = short, 2 = long) */
154 0, /* bitsize */
155 false, /* pc_relative */
156 0, /* bitpos */
157 complain_overflow_dont, /* complain_on_overflow */
158 NULL, /* special_function */
159 "R_386_GNU_VTINHERIT", /* name */
160 false, /* partial_inplace */
161 0, /* src_mask */
162 0, /* dst_mask */
163 false), /* pcrel_offset */
164
165 /* GNU extension to record C++ vtable member usage. */
166 HOWTO (R_386_GNU_VTENTRY, /* type */
167 0, /* rightshift */
168 2, /* size (0 = byte, 1 = short, 2 = long) */
169 0, /* bitsize */
170 false, /* pc_relative */
171 0, /* bitpos */
172 complain_overflow_dont, /* complain_on_overflow */
173 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
174 "R_386_GNU_VTENTRY", /* name */
175 false, /* partial_inplace */
176 0, /* src_mask */
177 0, /* dst_mask */
178 false) /* pcrel_offset */
179
180 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
181
182 };
183
184 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
185
186 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_386_GOT32X:
336 TRACE ("BFD_RELOC_386_GOT32X");
337 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
338
339 case BFD_RELOC_VTABLE_INHERIT:
340 TRACE ("BFD_RELOC_VTABLE_INHERIT");
341 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
342
343 case BFD_RELOC_VTABLE_ENTRY:
344 TRACE ("BFD_RELOC_VTABLE_ENTRY");
345 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
346
347 default:
348 TRACE ("Unknown");
349 /* xgettext:c-format */
350 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
351 abfd, (int) code);
352 bfd_set_error (bfd_error_bad_value);
353 return NULL;
354 }
355 }
356
357 static reloc_howto_type *
358 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
359 const char *r_name)
360 {
361 unsigned int i;
362
363 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
364 if (elf_howto_table[i].name != NULL
365 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
366 return &elf_howto_table[i];
367
368 return NULL;
369 }
370
371 static reloc_howto_type *
372 elf_i386_rtype_to_howto (unsigned r_type)
373 {
374 unsigned int indx;
375
376 if ((indx = r_type) >= R_386_standard
377 && ((indx = r_type - R_386_ext_offset) - R_386_standard
378 >= R_386_ext - R_386_standard)
379 && ((indx = r_type - R_386_tls_offset) - R_386_ext
380 >= R_386_ext2 - R_386_ext)
381 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
382 >= R_386_vt - R_386_ext2))
383 return NULL;
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table [indx].type != r_type)
386 return NULL;
387 return &elf_howto_table[indx];
388 }
389
390 static bool
391 elf_i386_info_to_howto_rel (bfd *abfd,
392 arelent *cache_ptr,
393 Elf_Internal_Rela *dst)
394 {
395 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
396
397 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
398 {
399 /* xgettext:c-format */
400 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
401 abfd, r_type);
402 bfd_set_error (bfd_error_bad_value);
403 return false;
404 }
405
406 return true;
407 }
408
409 /* Return whether a symbol name implies a local label. The UnixWare
410 2.1 cc generates temporary symbols that start with .X, so we
411 recognize them here. FIXME: do other SVR4 compilers also use .X?.
412 If so, we should move the .X recognition into
413 _bfd_elf_is_local_label_name. */
414
415 static bool
416 elf_i386_is_local_label_name (bfd *abfd, const char *name)
417 {
418 if (name[0] == '.' && name[1] == 'X')
419 return true;
420
421 return _bfd_elf_is_local_label_name (abfd, name);
422 }
423 \f
424 /* Support for core dump NOTE sections. */
425
426 static bool
427 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
428 {
429 int offset;
430 size_t size;
431
432 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
433 {
434 int pr_version = bfd_get_32 (abfd, note->descdata);
435
436 if (pr_version != 1)
437 return false;
438
439 /* pr_cursig */
440 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
441
442 /* pr_pid */
443 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
444
445 /* pr_reg */
446 offset = 28;
447 size = bfd_get_32 (abfd, note->descdata + 8);
448 }
449 else
450 {
451 switch (note->descsz)
452 {
453 default:
454 return false;
455
456 case 144: /* Linux/i386 */
457 /* pr_cursig */
458 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
459
460 /* pr_pid */
461 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
462
463 /* pr_reg */
464 offset = 72;
465 size = 68;
466
467 break;
468 }
469 }
470
471 /* Make a ".reg/999" section. */
472 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
473 size, note->descpos + offset);
474 }
475
476 static bool
477 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
478 {
479 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
480 {
481 int pr_version = bfd_get_32 (abfd, note->descdata);
482
483 if (pr_version != 1)
484 return false;
485
486 elf_tdata (abfd)->core->program
487 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
488 elf_tdata (abfd)->core->command
489 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
490 }
491 else
492 {
493 switch (note->descsz)
494 {
495 default:
496 return false;
497
498 case 124: /* Linux/i386 elf_prpsinfo. */
499 elf_tdata (abfd)->core->pid
500 = bfd_get_32 (abfd, note->descdata + 12);
501 elf_tdata (abfd)->core->program
502 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
503 elf_tdata (abfd)->core->command
504 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
505 }
506 }
507
508 /* Note that for some reason, a spurious space is tacked
509 onto the end of the args in some (at least one anyway)
510 implementations, so strip it off if it exists. */
511 {
512 char *command = elf_tdata (abfd)->core->command;
513 int n = strlen (command);
514
515 if (0 < n && command[n - 1] == ' ')
516 command[n - 1] = '\0';
517 }
518
519 return true;
520 }
521 \f
522 /* Functions for the i386 ELF linker.
523
524 In order to gain some understanding of code in this file without
525 knowing all the intricate details of the linker, note the
526 following:
527
528 Functions named elf_i386_* are called by external routines, other
529 functions are only called locally. elf_i386_* functions appear
530 in this file more or less in the order in which they are called
531 from external routines. eg. elf_i386_check_relocs is called
532 early in the link process, elf_i386_finish_dynamic_sections is
533 one of the last functions. */
534
535 /* The size in bytes of an entry in the lazy procedure linkage table. */
536
537 #define LAZY_PLT_ENTRY_SIZE 16
538
539 /* The size in bytes of an entry in the non-lazy procedure linkage
540 table. */
541
542 #define NON_LAZY_PLT_ENTRY_SIZE 8
543
544 /* The first entry in an absolute lazy procedure linkage table looks
545 like this. See the SVR4 ABI i386 supplement to see how this works.
546 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
547
548 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
549 {
550 0xff, 0x35, /* pushl contents of address */
551 0, 0, 0, 0, /* replaced with address of .got + 4. */
552 0xff, 0x25, /* jmp indirect */
553 0, 0, 0, 0 /* replaced with address of .got + 8. */
554 };
555
556 /* Subsequent entries in an absolute lazy procedure linkage table look
557 like this. */
558
559 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
560 {
561 0xff, 0x25, /* jmp indirect */
562 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
563 0x68, /* pushl immediate */
564 0, 0, 0, 0, /* replaced with offset into relocation table. */
565 0xe9, /* jmp relative */
566 0, 0, 0, 0 /* replaced with offset to start of .plt. */
567 };
568
569 /* The first entry in a PIC lazy procedure linkage table look like
570 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
571 lazy_plt->plt0_pad_byte. */
572
573 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
574 {
575 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
576 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
577 };
578
579 /* Subsequent entries in a PIC lazy procedure linkage table look like
580 this. */
581
582 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
583 {
584 0xff, 0xa3, /* jmp *offset(%ebx) */
585 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
586 0x68, /* pushl immediate */
587 0, 0, 0, 0, /* replaced with offset into relocation table. */
588 0xe9, /* jmp relative */
589 0, 0, 0, 0 /* replaced with offset to start of .plt. */
590 };
591
592 /* Entries in the non-lazy procedure linkage table look like this. */
593
594 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
595 {
596 0xff, 0x25, /* jmp indirect */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
599 };
600
601 /* Entries in the PIC non-lazy procedure linkage table look like
602 this. */
603
604 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* The first entry in an absolute IBT-enabled lazy procedure linkage
612 table looks like this. */
613
614 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
615 {
616 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
617 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
618 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
619 };
620
621 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
622 table look like this. Subsequent entries for a PIC IBT-enabled lazy
623 procedure linkage table are the same. */
624
625 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
626 {
627 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
628 0x68, 0, 0, 0, 0, /* pushl immediate */
629 0xe9, 0, 0, 0, 0, /* jmp relative */
630 0x66, 0x90 /* xchg %ax,%ax */
631 };
632
633 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
634 look like. */
635
636 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
637 {
638 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
639 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
640 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
641 };
642
643 /* Entries for branches with IBT-enabled in the absolute non-lazey
644 procedure linkage table look like this. They have the same size
645 as the lazy PLT entry. */
646
647 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
648 {
649 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
650 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
651 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
652 };
653
654 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
655 linkage table look like this. They have the same size as the lazy
656 PLT entry. */
657
658 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
659 {
660 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
661 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
662 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
663 };
664
665 /* .eh_frame covering the lazy .plt section. */
666
667 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
668 {
669 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
670 0, 0, 0, 0, /* CIE ID */
671 1, /* CIE version */
672 'z', 'R', 0, /* Augmentation string */
673 1, /* Code alignment factor */
674 0x7c, /* Data alignment factor */
675 8, /* Return address column */
676 1, /* Augmentation size */
677 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
678 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
679 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
680 DW_CFA_nop, DW_CFA_nop,
681
682 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
683 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
684 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
685 0, 0, 0, 0, /* .plt size goes here */
686 0, /* Augmentation size */
687 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
688 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
689 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
690 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
691 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
692 11, /* Block length */
693 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
694 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
695 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
696 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
697 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
698 };
699
700 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
701
702 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
703 {
704 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
705 0, 0, 0, 0, /* CIE ID */
706 1, /* CIE version */
707 'z', 'R', 0, /* Augmentation string */
708 1, /* Code alignment factor */
709 0x7c, /* Data alignment factor */
710 8, /* Return address column */
711 1, /* Augmentation size */
712 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
713 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
714 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
715 DW_CFA_nop, DW_CFA_nop,
716
717 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
718 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
719 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
720 0, 0, 0, 0, /* .plt size goes here */
721 0, /* Augmentation size */
722 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
723 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
724 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
725 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
726 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
727 11, /* Block length */
728 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
729 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
730 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
731 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
732 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
733 };
734
735 /* .eh_frame covering the non-lazy .plt section. */
736
737 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
738 {
739 #define PLT_GOT_FDE_LENGTH 16
740 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
741 0, 0, 0, 0, /* CIE ID */
742 1, /* CIE version */
743 'z', 'R', 0, /* Augmentation string */
744 1, /* Code alignment factor */
745 0x7c, /* Data alignment factor */
746 8, /* Return address column */
747 1, /* Augmentation size */
748 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
749 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
750 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
751 DW_CFA_nop, DW_CFA_nop,
752
753 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
754 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
755 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
756 0, 0, 0, 0, /* non-lazy .plt size goes here */
757 0, /* Augmentation size */
758 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
759 };
760
761 /* These are the standard parameters. */
762 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
763 {
764 elf_i386_lazy_plt0_entry, /* plt0_entry */
765 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
766 elf_i386_lazy_plt_entry, /* plt_entry */
767 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
768 NULL, /* plt_tlsdesc_entry */
769 0, /* plt_tlsdesc_entry_size*/
770 0, /* plt_tlsdesc_got1_offset */
771 0, /* plt_tlsdesc_got2_offset */
772 0, /* plt_tlsdesc_got1_insn_end */
773 0, /* plt_tlsdesc_got2_insn_end */
774 2, /* plt0_got1_offset */
775 8, /* plt0_got2_offset */
776 0, /* plt0_got2_insn_end */
777 2, /* plt_got_offset */
778 7, /* plt_reloc_offset */
779 12, /* plt_plt_offset */
780 0, /* plt_got_insn_size */
781 0, /* plt_plt_insn_end */
782 6, /* plt_lazy_offset */
783 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
784 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
785 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
786 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
787 };
788
789 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
790 {
791 elf_i386_non_lazy_plt_entry, /* plt_entry */
792 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
793 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
794 2, /* plt_got_offset */
795 0, /* plt_got_insn_size */
796 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
797 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
798 };
799
800 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
801 {
802 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
803 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
804 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
805 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
806 NULL, /* plt_tlsdesc_entry */
807 0, /* plt_tlsdesc_entry_size*/
808 0, /* plt_tlsdesc_got1_offset */
809 0, /* plt_tlsdesc_got2_offset */
810 0, /* plt_tlsdesc_got1_insn_end */
811 0, /* plt_tlsdesc_got2_insn_end */
812 2, /* plt0_got1_offset */
813 8, /* plt0_got2_offset */
814 0, /* plt0_got2_insn_end */
815 4+2, /* plt_got_offset */
816 4+1, /* plt_reloc_offset */
817 4+6, /* plt_plt_offset */
818 0, /* plt_got_insn_size */
819 0, /* plt_plt_insn_end */
820 0, /* plt_lazy_offset */
821 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
822 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
823 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
824 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
825 };
826
827 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
828 {
829 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
830 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
831 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
832 4+2, /* plt_got_offset */
833 0, /* plt_got_insn_size */
834 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
835 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
836 };
837 \f
838
839 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
840 for the PLTResolve stub and then for each PLT entry. */
841 #define PLTRESOLVE_RELOCS_SHLIB 0
842 #define PLTRESOLVE_RELOCS 2
843 #define PLT_NON_JUMP_SLOT_RELOCS 2
844
845 /* Return TRUE if the TLS access code sequence support transition
846 from R_TYPE. */
847
848 static bool
849 elf_i386_check_tls_transition (asection *sec,
850 bfd_byte *contents,
851 Elf_Internal_Shdr *symtab_hdr,
852 struct elf_link_hash_entry **sym_hashes,
853 unsigned int r_type,
854 const Elf_Internal_Rela *rel,
855 const Elf_Internal_Rela *relend)
856 {
857 unsigned int val, type, reg;
858 unsigned long r_symndx;
859 struct elf_link_hash_entry *h;
860 bfd_vma offset;
861 bfd_byte *call;
862 bool indirect_call;
863
864 offset = rel->r_offset;
865 switch (r_type)
866 {
867 case R_386_TLS_GD:
868 case R_386_TLS_LDM:
869 if (offset < 2 || (rel + 1) >= relend)
870 return false;
871
872 indirect_call = false;
873 call = contents + offset + 4;
874 val = *(call - 5);
875 type = *(call - 6);
876 if (r_type == R_386_TLS_GD)
877 {
878 /* Check transition from GD access model. Only
879 leal foo@tlsgd(,%ebx,1), %eax
880 call ___tls_get_addr@PLT
881 or
882 leal foo@tlsgd(%ebx) %eax
883 call ___tls_get_addr@PLT
884 nop
885 or
886 leal foo@tlsgd(%reg), %eax
887 call *___tls_get_addr@GOT(%reg)
888 which may be converted to
889 addr32 call ___tls_get_addr
890 can transit to different access model. */
891 if ((offset + 10) > sec->size
892 || (type != 0x8d && type != 0x04))
893 return false;
894
895 if (type == 0x04)
896 {
897 /* leal foo@tlsgd(,%ebx,1), %eax
898 call ___tls_get_addr@PLT */
899 if (offset < 3)
900 return false;
901
902 if (*(call - 7) != 0x8d
903 || val != 0x1d
904 || call[0] != 0xe8)
905 return false;
906 }
907 else
908 {
909 /* This must be
910 leal foo@tlsgd(%ebx), %eax
911 call ___tls_get_addr@PLT
912 nop
913 or
914 leal foo@tlsgd(%reg), %eax
915 call *___tls_get_addr@GOT(%reg)
916 which may be converted to
917 addr32 call ___tls_get_addr
918
919 %eax can't be used as the GOT base register since it
920 is used to pass parameter to ___tls_get_addr. */
921 reg = val & 7;
922 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
923 return false;
924
925 indirect_call = call[0] == 0xff;
926 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
927 && !(call[0] == 0x67 && call[1] == 0xe8)
928 && !(indirect_call
929 && (call[1] & 0xf8) == 0x90
930 && (call[1] & 0x7) == reg))
931 return false;
932 }
933 }
934 else
935 {
936 /* Check transition from LD access model. Only
937 leal foo@tlsldm(%ebx), %eax
938 call ___tls_get_addr@PLT
939 or
940 leal foo@tlsldm(%reg), %eax
941 call *___tls_get_addr@GOT(%reg)
942 which may be converted to
943 addr32 call ___tls_get_addr
944 can transit to different access model. */
945 if (type != 0x8d || (offset + 9) > sec->size)
946 return false;
947
948 /* %eax can't be used as the GOT base register since it is
949 used to pass parameter to ___tls_get_addr. */
950 reg = val & 7;
951 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
952 return false;
953
954 indirect_call = call[0] == 0xff;
955 if (!(reg == 3 && call[0] == 0xe8)
956 && !(call[0] == 0x67 && call[1] == 0xe8)
957 && !(indirect_call
958 && (call[1] & 0xf8) == 0x90
959 && (call[1] & 0x7) == reg))
960 return false;
961 }
962
963 r_symndx = ELF32_R_SYM (rel[1].r_info);
964 if (r_symndx < symtab_hdr->sh_info)
965 return false;
966
967 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
968 if (h == NULL
969 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
970 return false;
971 else if (indirect_call)
972 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
973 else
974 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
975 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
976
977 case R_386_TLS_IE:
978 /* Check transition from IE access model:
979 movl foo@indntpoff(%rip), %eax
980 movl foo@indntpoff(%rip), %reg
981 addl foo@indntpoff(%rip), %reg
982 */
983
984 if (offset < 1 || (offset + 4) > sec->size)
985 return false;
986
987 /* Check "movl foo@tpoff(%rip), %eax" first. */
988 val = bfd_get_8 (abfd, contents + offset - 1);
989 if (val == 0xa1)
990 return true;
991
992 if (offset < 2)
993 return false;
994
995 /* Check movl|addl foo@tpoff(%rip), %reg. */
996 type = bfd_get_8 (abfd, contents + offset - 2);
997 return ((type == 0x8b || type == 0x03)
998 && (val & 0xc7) == 0x05);
999
1000 case R_386_TLS_GOTIE:
1001 case R_386_TLS_IE_32:
1002 /* Check transition from {IE_32,GOTIE} access model:
1003 subl foo@{tpoff,gontoff}(%reg1), %reg2
1004 movl foo@{tpoff,gontoff}(%reg1), %reg2
1005 addl foo@{tpoff,gontoff}(%reg1), %reg2
1006 */
1007
1008 if (offset < 2 || (offset + 4) > sec->size)
1009 return false;
1010
1011 val = bfd_get_8 (abfd, contents + offset - 1);
1012 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1013 return false;
1014
1015 type = bfd_get_8 (abfd, contents + offset - 2);
1016 return type == 0x8b || type == 0x2b || type == 0x03;
1017
1018 case R_386_TLS_GOTDESC:
1019 /* Check transition from GDesc access model:
1020 leal x@tlsdesc(%ebx), %eax
1021
1022 Make sure it's a leal adding ebx to a 32-bit offset
1023 into any register, although it's probably almost always
1024 going to be eax. */
1025
1026 if (offset < 2 || (offset + 4) > sec->size)
1027 return false;
1028
1029 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1030 return false;
1031
1032 val = bfd_get_8 (abfd, contents + offset - 1);
1033 return (val & 0xc7) == 0x83;
1034
1035 case R_386_TLS_DESC_CALL:
1036 /* Check transition from GDesc access model:
1037 call *x@tlsdesc(%eax)
1038 */
1039 if (offset + 2 <= sec->size)
1040 {
1041 /* Make sure that it's a call *x@tlsdesc(%eax). */
1042 call = contents + offset;
1043 return call[0] == 0xff && call[1] == 0x10;
1044 }
1045
1046 return false;
1047
1048 default:
1049 abort ();
1050 }
1051 }
1052
1053 /* Return TRUE if the TLS access transition is OK or no transition
1054 will be performed. Update R_TYPE if there is a transition. */
1055
1056 static bool
1057 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1058 asection *sec, bfd_byte *contents,
1059 Elf_Internal_Shdr *symtab_hdr,
1060 struct elf_link_hash_entry **sym_hashes,
1061 unsigned int *r_type, int tls_type,
1062 const Elf_Internal_Rela *rel,
1063 const Elf_Internal_Rela *relend,
1064 struct elf_link_hash_entry *h,
1065 unsigned long r_symndx,
1066 bool from_relocate_section)
1067 {
1068 unsigned int from_type = *r_type;
1069 unsigned int to_type = from_type;
1070 bool check = true;
1071
1072 /* Skip TLS transition for functions. */
1073 if (h != NULL
1074 && (h->type == STT_FUNC
1075 || h->type == STT_GNU_IFUNC))
1076 return true;
1077
1078 switch (from_type)
1079 {
1080 case R_386_TLS_GD:
1081 case R_386_TLS_GOTDESC:
1082 case R_386_TLS_DESC_CALL:
1083 case R_386_TLS_IE_32:
1084 case R_386_TLS_IE:
1085 case R_386_TLS_GOTIE:
1086 if (bfd_link_executable (info))
1087 {
1088 if (h == NULL)
1089 to_type = R_386_TLS_LE_32;
1090 else if (from_type != R_386_TLS_IE
1091 && from_type != R_386_TLS_GOTIE)
1092 to_type = R_386_TLS_IE_32;
1093 }
1094
1095 /* When we are called from elf_i386_relocate_section, there may
1096 be additional transitions based on TLS_TYPE. */
1097 if (from_relocate_section)
1098 {
1099 unsigned int new_to_type = to_type;
1100
1101 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1102 new_to_type = R_386_TLS_LE_32;
1103
1104 if (to_type == R_386_TLS_GD
1105 || to_type == R_386_TLS_GOTDESC
1106 || to_type == R_386_TLS_DESC_CALL)
1107 {
1108 if (tls_type == GOT_TLS_IE_POS)
1109 new_to_type = R_386_TLS_GOTIE;
1110 else if (tls_type & GOT_TLS_IE)
1111 new_to_type = R_386_TLS_IE_32;
1112 }
1113
1114 /* We checked the transition before when we were called from
1115 elf_i386_check_relocs. We only want to check the new
1116 transition which hasn't been checked before. */
1117 check = new_to_type != to_type && from_type == to_type;
1118 to_type = new_to_type;
1119 }
1120
1121 break;
1122
1123 case R_386_TLS_LDM:
1124 if (bfd_link_executable (info))
1125 to_type = R_386_TLS_LE_32;
1126 break;
1127
1128 default:
1129 return true;
1130 }
1131
1132 /* Return TRUE if there is no transition. */
1133 if (from_type == to_type)
1134 return true;
1135
1136 /* Check if the transition can be performed. */
1137 if (check
1138 && ! elf_i386_check_tls_transition (sec, contents,
1139 symtab_hdr, sym_hashes,
1140 from_type, rel, relend))
1141 {
1142 reloc_howto_type *from, *to;
1143 const char *name;
1144
1145 from = elf_i386_rtype_to_howto (from_type);
1146 to = elf_i386_rtype_to_howto (to_type);
1147
1148 if (h)
1149 name = h->root.root.string;
1150 else
1151 {
1152 struct elf_x86_link_hash_table *htab;
1153
1154 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1155 if (htab == NULL)
1156 name = "*unknown*";
1157 else
1158 {
1159 Elf_Internal_Sym *isym;
1160
1161 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1162 abfd, r_symndx);
1163 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1164 }
1165 }
1166
1167 _bfd_error_handler
1168 /* xgettext:c-format */
1169 (_("%pB: TLS transition from %s to %s against `%s'"
1170 " at %#" PRIx64 " in section `%pA' failed"),
1171 abfd, from->name, to->name, name,
1172 (uint64_t) rel->r_offset, sec);
1173 bfd_set_error (bfd_error_bad_value);
1174 return false;
1175 }
1176
1177 *r_type = to_type;
1178 return true;
1179 }
1180
1181 /* With the local symbol, foo, we convert
1182 mov foo@GOT[(%reg1)], %reg2
1183 to
1184 lea foo[@GOTOFF(%reg1)], %reg2
1185 and convert
1186 call/jmp *foo@GOT[(%reg)]
1187 to
1188 nop call foo/jmp foo nop
1189 When PIC is false, convert
1190 test %reg1, foo@GOT[(%reg2)]
1191 to
1192 test $foo, %reg1
1193 and convert
1194 binop foo@GOT[(%reg1)], %reg2
1195 to
1196 binop $foo, %reg2
1197 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1198 instructions. */
1199
1200 static
1201 bool
1202 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1203 bfd_byte *contents,
1204 unsigned int *r_type_p,
1205 Elf_Internal_Rela *irel,
1206 struct elf_link_hash_entry *h,
1207 bool *converted,
1208 struct bfd_link_info *link_info)
1209 {
1210 struct elf_x86_link_hash_table *htab;
1211 unsigned int opcode;
1212 unsigned int modrm;
1213 bool baseless;
1214 Elf_Internal_Sym *isym;
1215 unsigned int addend;
1216 unsigned int nop;
1217 bfd_vma nop_offset;
1218 bool is_pic;
1219 bool to_reloc_32;
1220 bool abs_symbol;
1221 unsigned int r_type;
1222 unsigned int r_symndx;
1223 bfd_vma roff = irel->r_offset;
1224 bool local_ref;
1225 struct elf_x86_link_hash_entry *eh;
1226
1227 if (roff < 2)
1228 return true;
1229
1230 /* Addend for R_386_GOT32X relocations must be 0. */
1231 addend = bfd_get_32 (abfd, contents + roff);
1232 if (addend != 0)
1233 return true;
1234
1235 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1236 is_pic = bfd_link_pic (link_info);
1237
1238 r_type = *r_type_p;
1239 r_symndx = ELF32_R_SYM (irel->r_info);
1240
1241 modrm = bfd_get_8 (abfd, contents + roff - 1);
1242 baseless = (modrm & 0xc7) == 0x5;
1243
1244 if (h)
1245 {
1246 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1247 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1248 isym = NULL;
1249 abs_symbol = ABS_SYMBOL_P (h);
1250 }
1251 else
1252 {
1253 local_ref = true;
1254 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1255 r_symndx);
1256 abs_symbol = isym->st_shndx == SHN_ABS;
1257 }
1258
1259 if (baseless && is_pic)
1260 {
1261 /* For PIC, disallow R_386_GOT32X without a base register
1262 since we don't know what the GOT base is. */
1263 const char *name;
1264
1265 if (h == NULL)
1266 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1267 else
1268 name = h->root.root.string;
1269
1270 _bfd_error_handler
1271 /* xgettext:c-format */
1272 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1273 " register can not be used when making a shared object"),
1274 abfd, name);
1275 return false;
1276 }
1277
1278 opcode = bfd_get_8 (abfd, contents + roff - 2);
1279
1280 /* Convert to R_386_32 if PIC is false or there is no base
1281 register. */
1282 to_reloc_32 = !is_pic || baseless;
1283
1284 eh = elf_x86_hash_entry (h);
1285
1286 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1287 reloc. */
1288 if (h == NULL)
1289 {
1290 if (opcode == 0x0ff)
1291 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1292 goto convert_branch;
1293 else
1294 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1295 "test %reg1, foo@GOT(%reg2)" and
1296 "binop foo@GOT[(%reg1)], %reg2". */
1297 goto convert_load;
1298 }
1299
1300 /* Undefined weak symbol is only bound locally in executable
1301 and its reference is resolved as 0. */
1302 if (h->root.type == bfd_link_hash_undefweak
1303 && !eh->linker_def
1304 && local_ref)
1305 {
1306 if (opcode == 0xff)
1307 {
1308 /* No direct branch to 0 for PIC. */
1309 if (is_pic)
1310 return true;
1311 else
1312 goto convert_branch;
1313 }
1314 else
1315 {
1316 /* We can convert load of address 0 to R_386_32. */
1317 to_reloc_32 = true;
1318 goto convert_load;
1319 }
1320 }
1321
1322 if (opcode == 0xff)
1323 {
1324 /* We have "call/jmp *foo@GOT[(%reg)]". */
1325 if ((h->root.type == bfd_link_hash_defined
1326 || h->root.type == bfd_link_hash_defweak)
1327 && local_ref)
1328 {
1329 /* The function is locally defined. */
1330 convert_branch:
1331 /* Convert R_386_GOT32X to R_386_PC32. */
1332 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1333 {
1334 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1335 is a nop prefix. */
1336 modrm = 0xe8;
1337 /* To support TLS optimization, always use addr32 prefix
1338 for "call *___tls_get_addr@GOT(%reg)". */
1339 if (eh && eh->tls_get_addr)
1340 {
1341 nop = 0x67;
1342 nop_offset = irel->r_offset - 2;
1343 }
1344 else
1345 {
1346 nop = htab->params->call_nop_byte;
1347 if (htab->params->call_nop_as_suffix)
1348 {
1349 nop_offset = roff + 3;
1350 irel->r_offset -= 1;
1351 }
1352 else
1353 nop_offset = roff - 2;
1354 }
1355 }
1356 else
1357 {
1358 /* Convert to "jmp foo nop". */
1359 modrm = 0xe9;
1360 nop = NOP_OPCODE;
1361 nop_offset = roff + 3;
1362 irel->r_offset -= 1;
1363 }
1364
1365 bfd_put_8 (abfd, nop, contents + nop_offset);
1366 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1367 /* When converting to PC-relative relocation, we
1368 need to adjust addend by -4. */
1369 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1370 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1371 *r_type_p = R_386_PC32;
1372 *converted = true;
1373 }
1374 }
1375 else
1376 {
1377 /* We have "mov foo@GOT[(%re1g)], %reg2",
1378 "test %reg1, foo@GOT(%reg2)" and
1379 "binop foo@GOT[(%reg1)], %reg2".
1380
1381 Avoid optimizing _DYNAMIC since ld.so may use its
1382 link-time address. */
1383 if (h == htab->elf.hdynamic)
1384 return true;
1385
1386 /* def_regular is set by an assignment in a linker script in
1387 bfd_elf_record_link_assignment. start_stop is set on
1388 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1389 if (h->start_stop
1390 || eh->linker_def
1391 || ((h->def_regular
1392 || h->root.type == bfd_link_hash_defined
1393 || h->root.type == bfd_link_hash_defweak)
1394 && local_ref))
1395 {
1396 /* Skip __start_SECNAME/__stop_SECNAME when --gc-sections
1397 -z start-stop-gc are used. */
1398 if (elf_x86_start_stop_gc_p (link_info, h))
1399 return true;
1400
1401 convert_load:
1402 if (opcode == 0x8b)
1403 {
1404 if (abs_symbol && local_ref)
1405 to_reloc_32 = true;
1406
1407 if (to_reloc_32)
1408 {
1409 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1410 "mov $foo, %reg2" with R_386_32. */
1411 r_type = R_386_32;
1412 modrm = 0xc0 | (modrm & 0x38) >> 3;
1413 bfd_put_8 (abfd, modrm, contents + roff - 1);
1414 opcode = 0xc7;
1415 }
1416 else
1417 {
1418 /* Convert "mov foo@GOT(%reg1), %reg2" to
1419 "lea foo@GOTOFF(%reg1), %reg2". */
1420 r_type = R_386_GOTOFF;
1421 opcode = 0x8d;
1422 }
1423 }
1424 else
1425 {
1426 /* Only R_386_32 is supported. */
1427 if (!to_reloc_32)
1428 return true;
1429
1430 if (opcode == 0x85)
1431 {
1432 /* Convert "test %reg1, foo@GOT(%reg2)" to
1433 "test $foo, %reg1". */
1434 modrm = 0xc0 | (modrm & 0x38) >> 3;
1435 opcode = 0xf7;
1436 }
1437 else
1438 {
1439 /* Convert "binop foo@GOT(%reg1), %reg2" to
1440 "binop $foo, %reg2". */
1441 modrm = (0xc0
1442 | (modrm & 0x38) >> 3
1443 | (opcode & 0x3c));
1444 opcode = 0x81;
1445 }
1446 bfd_put_8 (abfd, modrm, contents + roff - 1);
1447 r_type = R_386_32;
1448 }
1449
1450 bfd_put_8 (abfd, opcode, contents + roff - 2);
1451 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1452 *r_type_p = r_type;
1453 *converted = true;
1454 }
1455 }
1456
1457 return true;
1458 }
1459
1460 /* Rename some of the generic section flags to better document how they
1461 are used here. */
1462 #define check_relocs_failed sec_flg0
1463
1464 /* Look through the relocs for a section during the first phase, and
1465 calculate needed space in the global offset table, procedure linkage
1466 table, and dynamic reloc sections. */
1467
1468 static bool
1469 elf_i386_check_relocs (bfd *abfd,
1470 struct bfd_link_info *info,
1471 asection *sec,
1472 const Elf_Internal_Rela *relocs)
1473 {
1474 struct elf_x86_link_hash_table *htab;
1475 Elf_Internal_Shdr *symtab_hdr;
1476 struct elf_link_hash_entry **sym_hashes;
1477 const Elf_Internal_Rela *rel;
1478 const Elf_Internal_Rela *rel_end;
1479 asection *sreloc;
1480 bfd_byte *contents;
1481 bool converted;
1482
1483 if (bfd_link_relocatable (info))
1484 return true;
1485
1486 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1487 if (htab == NULL)
1488 {
1489 sec->check_relocs_failed = 1;
1490 return false;
1491 }
1492
1493 BFD_ASSERT (is_x86_elf (abfd, htab));
1494
1495 /* Get the section contents. */
1496 if (elf_section_data (sec)->this_hdr.contents != NULL)
1497 contents = elf_section_data (sec)->this_hdr.contents;
1498 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1499 {
1500 sec->check_relocs_failed = 1;
1501 return false;
1502 }
1503
1504 symtab_hdr = &elf_symtab_hdr (abfd);
1505 sym_hashes = elf_sym_hashes (abfd);
1506
1507 converted = false;
1508
1509 sreloc = NULL;
1510
1511 rel_end = relocs + sec->reloc_count;
1512 for (rel = relocs; rel < rel_end; rel++)
1513 {
1514 unsigned int r_type;
1515 unsigned int r_symndx;
1516 struct elf_link_hash_entry *h;
1517 struct elf_x86_link_hash_entry *eh;
1518 Elf_Internal_Sym *isym;
1519 const char *name;
1520 bool size_reloc;
1521 bool no_dynreloc;
1522
1523 r_symndx = ELF32_R_SYM (rel->r_info);
1524 r_type = ELF32_R_TYPE (rel->r_info);
1525
1526 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1527 {
1528 /* xgettext:c-format */
1529 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1530 abfd, r_symndx);
1531 goto error_return;
1532 }
1533
1534 if (r_symndx < symtab_hdr->sh_info)
1535 {
1536 /* A local symbol. */
1537 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1538 abfd, r_symndx);
1539 if (isym == NULL)
1540 goto error_return;
1541
1542 /* Check relocation against local STT_GNU_IFUNC symbol. */
1543 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1544 {
1545 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1546 if (h == NULL)
1547 goto error_return;
1548
1549 /* Fake a STT_GNU_IFUNC symbol. */
1550 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1551 isym, NULL);
1552 h->type = STT_GNU_IFUNC;
1553 h->def_regular = 1;
1554 h->ref_regular = 1;
1555 h->forced_local = 1;
1556 h->root.type = bfd_link_hash_defined;
1557 }
1558 else
1559 h = NULL;
1560 }
1561 else
1562 {
1563 isym = NULL;
1564 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1565 while (h->root.type == bfd_link_hash_indirect
1566 || h->root.type == bfd_link_hash_warning)
1567 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1568 }
1569
1570 eh = (struct elf_x86_link_hash_entry *) h;
1571 if (h != NULL)
1572 {
1573 if (r_type == R_386_GOTOFF)
1574 eh->gotoff_ref = 1;
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 }
1579
1580 if (r_type == R_386_GOT32X
1581 && (h == NULL || h->type != STT_GNU_IFUNC))
1582 {
1583 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1584 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1585 &r_type, irel, h,
1586 &converted, info))
1587 goto error_return;
1588 }
1589
1590 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1591 symtab_hdr, &no_dynreloc))
1592 return false;
1593
1594 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1595 symtab_hdr, sym_hashes,
1596 &r_type, GOT_UNKNOWN,
1597 rel, rel_end, h, r_symndx, false))
1598 goto error_return;
1599
1600 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1601 if (h == htab->elf.hgot)
1602 htab->got_referenced = true;
1603
1604 switch (r_type)
1605 {
1606 case R_386_TLS_LDM:
1607 htab->tls_ld_or_ldm_got.refcount = 1;
1608 goto create_got;
1609
1610 case R_386_PLT32:
1611 /* This symbol requires a procedure linkage table entry. We
1612 actually build the entry in adjust_dynamic_symbol,
1613 because this might be a case of linking PIC code which is
1614 never referenced by a dynamic object, in which case we
1615 don't need to generate a procedure linkage table entry
1616 after all. */
1617
1618 /* If this is a local symbol, we resolve it directly without
1619 creating a procedure linkage table entry. */
1620 if (h == NULL)
1621 continue;
1622
1623 eh->zero_undefweak &= 0x2;
1624 h->needs_plt = 1;
1625 h->plt.refcount = 1;
1626 break;
1627
1628 case R_386_SIZE32:
1629 size_reloc = true;
1630 goto do_size;
1631
1632 case R_386_TLS_IE_32:
1633 case R_386_TLS_IE:
1634 case R_386_TLS_GOTIE:
1635 if (!bfd_link_executable (info))
1636 info->flags |= DF_STATIC_TLS;
1637 /* Fall through */
1638
1639 case R_386_GOT32:
1640 case R_386_GOT32X:
1641 case R_386_TLS_GD:
1642 case R_386_TLS_GOTDESC:
1643 case R_386_TLS_DESC_CALL:
1644 /* This symbol requires a global offset table entry. */
1645 {
1646 int tls_type, old_tls_type;
1647
1648 switch (r_type)
1649 {
1650 default:
1651 case R_386_GOT32:
1652 case R_386_GOT32X:
1653 tls_type = GOT_NORMAL;
1654 break;
1655 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1656 case R_386_TLS_GOTDESC:
1657 case R_386_TLS_DESC_CALL:
1658 tls_type = GOT_TLS_GDESC; break;
1659 case R_386_TLS_IE_32:
1660 if (ELF32_R_TYPE (rel->r_info) == r_type)
1661 tls_type = GOT_TLS_IE_NEG;
1662 else
1663 /* If this is a GD->IE transition, we may use either of
1664 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1665 tls_type = GOT_TLS_IE;
1666 break;
1667 case R_386_TLS_IE:
1668 case R_386_TLS_GOTIE:
1669 tls_type = GOT_TLS_IE_POS; break;
1670 }
1671
1672 if (h != NULL)
1673 {
1674 h->got.refcount = 1;
1675 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1676 }
1677 else
1678 {
1679 bfd_signed_vma *local_got_refcounts;
1680
1681 /* This is a global offset table entry for a local symbol. */
1682 local_got_refcounts = elf_local_got_refcounts (abfd);
1683 if (local_got_refcounts == NULL)
1684 {
1685 bfd_size_type size;
1686
1687 size = symtab_hdr->sh_info;
1688 size *= (sizeof (bfd_signed_vma)
1689 + sizeof (bfd_vma) + sizeof(char));
1690 local_got_refcounts = (bfd_signed_vma *)
1691 bfd_zalloc (abfd, size);
1692 if (local_got_refcounts == NULL)
1693 goto error_return;
1694 elf_local_got_refcounts (abfd) = local_got_refcounts;
1695 elf_x86_local_tlsdesc_gotent (abfd)
1696 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1697 elf_x86_local_got_tls_type (abfd)
1698 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1699 }
1700 local_got_refcounts[r_symndx] = 1;
1701 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1702 }
1703
1704 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1705 tls_type |= old_tls_type;
1706 /* If a TLS symbol is accessed using IE at least once,
1707 there is no point to use dynamic model for it. */
1708 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1709 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1710 || (tls_type & GOT_TLS_IE) == 0))
1711 {
1712 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1713 tls_type = old_tls_type;
1714 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1715 && GOT_TLS_GD_ANY_P (tls_type))
1716 tls_type |= old_tls_type;
1717 else
1718 {
1719 if (h)
1720 name = h->root.root.string;
1721 else
1722 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1723 NULL);
1724 _bfd_error_handler
1725 /* xgettext:c-format */
1726 (_("%pB: `%s' accessed both as normal and "
1727 "thread local symbol"),
1728 abfd, name);
1729 bfd_set_error (bfd_error_bad_value);
1730 goto error_return;
1731 }
1732 }
1733
1734 if (old_tls_type != tls_type)
1735 {
1736 if (h != NULL)
1737 elf_x86_hash_entry (h)->tls_type = tls_type;
1738 else
1739 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1740 }
1741 }
1742 /* Fall through */
1743
1744 case R_386_GOTOFF:
1745 case R_386_GOTPC:
1746 create_got:
1747 if (r_type != R_386_TLS_IE)
1748 {
1749 if (eh != NULL)
1750 {
1751 eh->zero_undefweak &= 0x2;
1752
1753 /* Need GOT to resolve undefined weak symbol to 0. */
1754 if (r_type == R_386_GOTOFF
1755 && h->root.type == bfd_link_hash_undefweak
1756 && bfd_link_executable (info))
1757 htab->got_referenced = true;
1758 }
1759 break;
1760 }
1761 /* Fall through */
1762
1763 case R_386_TLS_LE_32:
1764 case R_386_TLS_LE:
1765 if (eh != NULL)
1766 eh->zero_undefweak &= 0x2;
1767 if (bfd_link_executable (info))
1768 break;
1769 info->flags |= DF_STATIC_TLS;
1770 goto do_relocation;
1771
1772 case R_386_32:
1773 case R_386_PC32:
1774 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1775 eh->zero_undefweak |= 0x2;
1776 do_relocation:
1777 /* We are called after all symbols have been resolved. Only
1778 relocation against STT_GNU_IFUNC symbol must go through
1779 PLT. */
1780 if (h != NULL
1781 && (bfd_link_executable (info)
1782 || h->type == STT_GNU_IFUNC))
1783 {
1784 bool func_pointer_ref = false;
1785
1786 if (r_type == R_386_PC32)
1787 {
1788 /* Since something like ".long foo - ." may be used
1789 as pointer, make sure that PLT is used if foo is
1790 a function defined in a shared library. */
1791 if ((sec->flags & SEC_CODE) == 0)
1792 h->pointer_equality_needed = 1;
1793 else if (h->type == STT_GNU_IFUNC
1794 && bfd_link_pic (info))
1795 {
1796 _bfd_error_handler
1797 /* xgettext:c-format */
1798 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1799 abfd, h->root.root.string);
1800 bfd_set_error (bfd_error_bad_value);
1801 goto error_return;
1802 }
1803 }
1804 else
1805 {
1806 h->pointer_equality_needed = 1;
1807 /* R_386_32 can be resolved at run-time. */
1808 if (r_type == R_386_32
1809 && (sec->flags & SEC_READONLY) == 0)
1810 func_pointer_ref = true;
1811 }
1812
1813 if (!func_pointer_ref)
1814 {
1815 /* If this reloc is in a read-only section, we might
1816 need a copy reloc. We can't check reliably at this
1817 stage whether the section is read-only, as input
1818 sections have not yet been mapped to output sections.
1819 Tentatively set the flag for now, and correct in
1820 adjust_dynamic_symbol. */
1821 h->non_got_ref = 1;
1822
1823 if (!elf_has_indirect_extern_access (sec->owner))
1824 eh->non_got_ref_without_indirect_extern_access = 1;
1825
1826 /* We may need a .plt entry if the symbol is a function
1827 defined in a shared lib or is a function referenced
1828 from the code or read-only section. */
1829 if (!h->def_regular
1830 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1831 h->plt.refcount = 1;
1832 }
1833 }
1834
1835 size_reloc = false;
1836 do_size:
1837 if (!no_dynreloc
1838 && NEED_DYNAMIC_RELOCATION_P (info, false, h, sec, r_type,
1839 R_386_32))
1840 {
1841 struct elf_dyn_relocs *p;
1842 struct elf_dyn_relocs **head;
1843
1844 /* We must copy these reloc types into the output file.
1845 Create a reloc section in dynobj and make room for
1846 this reloc. */
1847 if (sreloc == NULL)
1848 {
1849 sreloc = _bfd_elf_make_dynamic_reloc_section
1850 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ false);
1851
1852 if (sreloc == NULL)
1853 goto error_return;
1854 }
1855
1856 /* If this is a global symbol, we count the number of
1857 relocations we need for this symbol. */
1858 if (h != NULL)
1859 {
1860 head = &h->dyn_relocs;
1861 }
1862 else
1863 {
1864 /* Track dynamic relocs needed for local syms too.
1865 We really need local syms available to do this
1866 easily. Oh well. */
1867 void **vpp;
1868 asection *s;
1869
1870 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1871 abfd, r_symndx);
1872 if (isym == NULL)
1873 goto error_return;
1874
1875 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1876 if (s == NULL)
1877 s = sec;
1878
1879 vpp = &elf_section_data (s)->local_dynrel;
1880 head = (struct elf_dyn_relocs **)vpp;
1881 }
1882
1883 p = *head;
1884 if (p == NULL || p->sec != sec)
1885 {
1886 size_t amt = sizeof *p;
1887 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1888 amt);
1889 if (p == NULL)
1890 goto error_return;
1891 p->next = *head;
1892 *head = p;
1893 p->sec = sec;
1894 p->count = 0;
1895 p->pc_count = 0;
1896 }
1897
1898 p->count += 1;
1899 /* Count size relocation as PC-relative relocation. */
1900 if (r_type == R_386_PC32 || size_reloc)
1901 p->pc_count += 1;
1902 }
1903 break;
1904
1905 /* This relocation describes the C++ object vtable hierarchy.
1906 Reconstruct it for later use during GC. */
1907 case R_386_GNU_VTINHERIT:
1908 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1909 goto error_return;
1910 break;
1911
1912 /* This relocation describes which C++ vtable entries are actually
1913 used. Record for later use during GC. */
1914 case R_386_GNU_VTENTRY:
1915 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1916 goto error_return;
1917 break;
1918
1919 default:
1920 break;
1921 }
1922 }
1923
1924 if (elf_section_data (sec)->this_hdr.contents != contents)
1925 {
1926 if (!converted && !_bfd_link_keep_memory (info))
1927 free (contents);
1928 else
1929 {
1930 /* Cache the section contents for elf_link_input_bfd if any
1931 load is converted or --no-keep-memory isn't used. */
1932 elf_section_data (sec)->this_hdr.contents = contents;
1933 info->cache_size += sec->size;
1934 }
1935 }
1936
1937 /* Cache relocations if any load is converted. */
1938 if (elf_section_data (sec)->relocs != relocs && converted)
1939 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1940
1941 return true;
1942
1943 error_return:
1944 if (elf_section_data (sec)->this_hdr.contents != contents)
1945 free (contents);
1946 sec->check_relocs_failed = 1;
1947 return false;
1948 }
1949
1950 /* Set the correct type for an x86 ELF section. We do this by the
1951 section name, which is a hack, but ought to work. */
1952
1953 static bool
1954 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1955 Elf_Internal_Shdr *hdr,
1956 asection *sec)
1957 {
1958 const char *name;
1959
1960 name = bfd_section_name (sec);
1961
1962 /* This is an ugly, but unfortunately necessary hack that is
1963 needed when producing EFI binaries on x86. It tells
1964 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1965 containing ELF relocation info. We need this hack in order to
1966 be able to generate ELF binaries that can be translated into
1967 EFI applications (which are essentially COFF objects). Those
1968 files contain a COFF ".reloc" section inside an ELFNN object,
1969 which would normally cause BFD to segfault because it would
1970 attempt to interpret this section as containing relocation
1971 entries for section "oc". With this hack enabled, ".reloc"
1972 will be treated as a normal data section, which will avoid the
1973 segfault. However, you won't be able to create an ELFNN binary
1974 with a section named "oc" that needs relocations, but that's
1975 the kind of ugly side-effects you get when detecting section
1976 types based on their names... In practice, this limitation is
1977 unlikely to bite. */
1978 if (strcmp (name, ".reloc") == 0)
1979 hdr->sh_type = SHT_PROGBITS;
1980
1981 return true;
1982 }
1983
1984 /* Return the relocation value for @tpoff relocation
1985 if STT_TLS virtual address is ADDRESS. */
1986
1987 static bfd_vma
1988 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1989 {
1990 struct elf_link_hash_table *htab = elf_hash_table (info);
1991 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1992 bfd_vma static_tls_size;
1993
1994 /* If tls_sec is NULL, we should have signalled an error already. */
1995 if (htab->tls_sec == NULL)
1996 return 0;
1997
1998 /* Consider special static TLS alignment requirements. */
1999 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2000 return static_tls_size + htab->tls_sec->vma - address;
2001 }
2002
2003 /* Relocate an i386 ELF section. */
2004
2005 static int
2006 elf_i386_relocate_section (bfd *output_bfd,
2007 struct bfd_link_info *info,
2008 bfd *input_bfd,
2009 asection *input_section,
2010 bfd_byte *contents,
2011 Elf_Internal_Rela *relocs,
2012 Elf_Internal_Sym *local_syms,
2013 asection **local_sections)
2014 {
2015 struct elf_x86_link_hash_table *htab;
2016 Elf_Internal_Shdr *symtab_hdr;
2017 struct elf_link_hash_entry **sym_hashes;
2018 bfd_vma *local_got_offsets;
2019 bfd_vma *local_tlsdesc_gotents;
2020 Elf_Internal_Rela *rel;
2021 Elf_Internal_Rela *wrel;
2022 Elf_Internal_Rela *relend;
2023 bool is_vxworks_tls;
2024 unsigned plt_entry_size;
2025
2026 /* Skip if check_relocs failed. */
2027 if (input_section->check_relocs_failed)
2028 return false;
2029
2030 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2031 if (htab == NULL)
2032 return false;
2033
2034 if (!is_x86_elf (input_bfd, htab))
2035 {
2036 bfd_set_error (bfd_error_wrong_format);
2037 return false;
2038 }
2039
2040 symtab_hdr = &elf_symtab_hdr (input_bfd);
2041 sym_hashes = elf_sym_hashes (input_bfd);
2042 local_got_offsets = elf_local_got_offsets (input_bfd);
2043 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2044 /* We have to handle relocations in vxworks .tls_vars sections
2045 specially, because the dynamic loader is 'weird'. */
2046 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2047 && bfd_link_pic (info)
2048 && !strcmp (input_section->output_section->name,
2049 ".tls_vars"));
2050
2051 _bfd_x86_elf_set_tls_module_base (info);
2052
2053 plt_entry_size = htab->plt.plt_entry_size;
2054
2055 rel = wrel = relocs;
2056 relend = relocs + input_section->reloc_count;
2057 for (; rel < relend; wrel++, rel++)
2058 {
2059 unsigned int r_type, r_type_tls;
2060 reloc_howto_type *howto;
2061 unsigned long r_symndx;
2062 struct elf_link_hash_entry *h;
2063 struct elf_x86_link_hash_entry *eh;
2064 Elf_Internal_Sym *sym;
2065 asection *sec;
2066 bfd_vma off, offplt, plt_offset;
2067 bfd_vma relocation;
2068 bool unresolved_reloc;
2069 bfd_reloc_status_type r;
2070 unsigned int indx;
2071 int tls_type;
2072 bfd_vma st_size;
2073 asection *resolved_plt;
2074 bool resolved_to_zero;
2075 bool relative_reloc;
2076
2077 r_type = ELF32_R_TYPE (rel->r_info);
2078 if (r_type == R_386_GNU_VTINHERIT
2079 || r_type == R_386_GNU_VTENTRY)
2080 {
2081 if (wrel != rel)
2082 *wrel = *rel;
2083 continue;
2084 }
2085
2086 howto = elf_i386_rtype_to_howto (r_type);
2087 if (howto == NULL)
2088 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2089
2090 r_symndx = ELF32_R_SYM (rel->r_info);
2091 h = NULL;
2092 sym = NULL;
2093 sec = NULL;
2094 unresolved_reloc = false;
2095 if (r_symndx < symtab_hdr->sh_info)
2096 {
2097 sym = local_syms + r_symndx;
2098 sec = local_sections[r_symndx];
2099 relocation = (sec->output_section->vma
2100 + sec->output_offset
2101 + sym->st_value);
2102 st_size = sym->st_size;
2103
2104 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2105 && ((sec->flags & SEC_MERGE) != 0
2106 || (bfd_link_relocatable (info)
2107 && sec->output_offset != 0)))
2108 {
2109 bfd_vma addend;
2110 bfd_byte *where = contents + rel->r_offset;
2111
2112 switch (howto->size)
2113 {
2114 case 0:
2115 addend = bfd_get_8 (input_bfd, where);
2116 if (howto->pc_relative)
2117 {
2118 addend = (addend ^ 0x80) - 0x80;
2119 addend += 1;
2120 }
2121 break;
2122 case 1:
2123 addend = bfd_get_16 (input_bfd, where);
2124 if (howto->pc_relative)
2125 {
2126 addend = (addend ^ 0x8000) - 0x8000;
2127 addend += 2;
2128 }
2129 break;
2130 case 2:
2131 addend = bfd_get_32 (input_bfd, where);
2132 if (howto->pc_relative)
2133 {
2134 addend = (addend ^ 0x80000000) - 0x80000000;
2135 addend += 4;
2136 }
2137 break;
2138 default:
2139 abort ();
2140 }
2141
2142 if (bfd_link_relocatable (info))
2143 addend += sec->output_offset;
2144 else
2145 {
2146 asection *msec = sec;
2147 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2148 addend);
2149 addend -= relocation;
2150 addend += msec->output_section->vma + msec->output_offset;
2151 }
2152
2153 switch (howto->size)
2154 {
2155 case 0:
2156 /* FIXME: overflow checks. */
2157 if (howto->pc_relative)
2158 addend -= 1;
2159 bfd_put_8 (input_bfd, addend, where);
2160 break;
2161 case 1:
2162 if (howto->pc_relative)
2163 addend -= 2;
2164 bfd_put_16 (input_bfd, addend, where);
2165 break;
2166 case 2:
2167 if (howto->pc_relative)
2168 addend -= 4;
2169 bfd_put_32 (input_bfd, addend, where);
2170 break;
2171 }
2172 }
2173 else if (!bfd_link_relocatable (info)
2174 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2175 {
2176 /* Relocate against local STT_GNU_IFUNC symbol. */
2177 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2178 false);
2179 if (h == NULL)
2180 abort ();
2181
2182 /* Set STT_GNU_IFUNC symbol value. */
2183 h->root.u.def.value = sym->st_value;
2184 h->root.u.def.section = sec;
2185 }
2186 }
2187 else
2188 {
2189 bool warned ATTRIBUTE_UNUSED;
2190 bool ignored ATTRIBUTE_UNUSED;
2191
2192 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2193 r_symndx, symtab_hdr, sym_hashes,
2194 h, sec, relocation,
2195 unresolved_reloc, warned, ignored);
2196 st_size = h->size;
2197 }
2198
2199 if (sec != NULL && discarded_section (sec))
2200 {
2201 _bfd_clear_contents (howto, input_bfd, input_section,
2202 contents, rel->r_offset);
2203 wrel->r_offset = rel->r_offset;
2204 wrel->r_info = 0;
2205 wrel->r_addend = 0;
2206
2207 /* For ld -r, remove relocations in debug sections against
2208 sections defined in discarded sections. Not done for
2209 eh_frame editing code expects to be present. */
2210 if (bfd_link_relocatable (info)
2211 && (input_section->flags & SEC_DEBUGGING))
2212 wrel--;
2213
2214 continue;
2215 }
2216
2217 if (bfd_link_relocatable (info))
2218 {
2219 if (wrel != rel)
2220 *wrel = *rel;
2221 continue;
2222 }
2223
2224 eh = (struct elf_x86_link_hash_entry *) h;
2225
2226 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2227 it here if it is defined in a non-shared object. */
2228 if (h != NULL
2229 && h->type == STT_GNU_IFUNC
2230 && h->def_regular)
2231 {
2232 asection *gotplt, *base_got;
2233 bfd_vma plt_index;
2234 const char *name;
2235
2236 if ((input_section->flags & SEC_ALLOC) == 0)
2237 {
2238 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2239 STT_GNU_IFUNC symbol as STT_FUNC. */
2240 if (elf_section_type (input_section) == SHT_NOTE)
2241 goto skip_ifunc;
2242 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2243 sections because such sections are not SEC_ALLOC and
2244 thus ld.so will not process them. */
2245 if ((input_section->flags & SEC_DEBUGGING) != 0)
2246 continue;
2247 abort ();
2248 }
2249
2250 /* STT_GNU_IFUNC symbol must go through PLT. */
2251 if (htab->elf.splt != NULL)
2252 {
2253 if (htab->plt_second != NULL)
2254 {
2255 resolved_plt = htab->plt_second;
2256 plt_offset = eh->plt_second.offset;
2257 }
2258 else
2259 {
2260 resolved_plt = htab->elf.splt;
2261 plt_offset = h->plt.offset;
2262 }
2263 gotplt = htab->elf.sgotplt;
2264 }
2265 else
2266 {
2267 resolved_plt = htab->elf.iplt;
2268 plt_offset = h->plt.offset;
2269 gotplt = htab->elf.igotplt;
2270 }
2271
2272 switch (r_type)
2273 {
2274 default:
2275 break;
2276
2277 case R_386_GOT32:
2278 case R_386_GOT32X:
2279 base_got = htab->elf.sgot;
2280 off = h->got.offset;
2281
2282 if (base_got == NULL)
2283 abort ();
2284
2285 if (off == (bfd_vma) -1)
2286 {
2287 /* We can't use h->got.offset here to save state, or
2288 even just remember the offset, as finish_dynamic_symbol
2289 would use that as offset into .got. */
2290
2291 if (h->plt.offset == (bfd_vma) -1)
2292 abort ();
2293
2294 if (htab->elf.splt != NULL)
2295 {
2296 plt_index = (h->plt.offset / plt_entry_size
2297 - htab->plt.has_plt0);
2298 off = (plt_index + 3) * 4;
2299 base_got = htab->elf.sgotplt;
2300 }
2301 else
2302 {
2303 plt_index = h->plt.offset / plt_entry_size;
2304 off = plt_index * 4;
2305 base_got = htab->elf.igotplt;
2306 }
2307
2308 if (h->dynindx == -1
2309 || h->forced_local
2310 || info->symbolic)
2311 {
2312 /* This references the local defitionion. We must
2313 initialize this entry in the global offset table.
2314 Since the offset must always be a multiple of 8,
2315 we use the least significant bit to record
2316 whether we have initialized it already.
2317
2318 When doing a dynamic link, we create a .rela.got
2319 relocation entry to initialize the value. This
2320 is done in the finish_dynamic_symbol routine. */
2321 if ((off & 1) != 0)
2322 off &= ~1;
2323 else
2324 {
2325 bfd_put_32 (output_bfd, relocation,
2326 base_got->contents + off);
2327 h->got.offset |= 1;
2328 }
2329 }
2330
2331 relocation = off;
2332 }
2333 else
2334 relocation = (base_got->output_section->vma
2335 + base_got->output_offset + off
2336 - gotplt->output_section->vma
2337 - gotplt->output_offset);
2338
2339 if (rel->r_offset > 1
2340 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2341 && *(contents + rel->r_offset - 2) != 0x8d)
2342 {
2343 if (bfd_link_pic (info))
2344 goto disallow_got32;
2345
2346 /* Add the GOT base if there is no base register. */
2347 relocation += (gotplt->output_section->vma
2348 + gotplt->output_offset);
2349 }
2350 else if (htab->elf.splt == NULL)
2351 {
2352 /* Adjust for static executables. */
2353 relocation += gotplt->output_offset;
2354 }
2355
2356 goto do_relocation;
2357 }
2358
2359 if (h->plt.offset == (bfd_vma) -1)
2360 {
2361 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2362 if (r_type == R_386_32
2363 && (input_section->flags & SEC_CODE) == 0)
2364 goto do_ifunc_pointer;
2365 goto bad_ifunc_reloc;
2366 }
2367
2368 relocation = (resolved_plt->output_section->vma
2369 + resolved_plt->output_offset + plt_offset);
2370
2371 switch (r_type)
2372 {
2373 default:
2374 bad_ifunc_reloc:
2375 if (h->root.root.string)
2376 name = h->root.root.string;
2377 else
2378 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2379 NULL);
2380 _bfd_error_handler
2381 /* xgettext:c-format */
2382 (_("%pB: relocation %s against STT_GNU_IFUNC "
2383 "symbol `%s' isn't supported"), input_bfd,
2384 howto->name, name);
2385 bfd_set_error (bfd_error_bad_value);
2386 return false;
2387
2388 case R_386_32:
2389 /* Generate dynamic relcoation only when there is a
2390 non-GOT reference in a shared object. */
2391 if ((bfd_link_pic (info) && h->non_got_ref)
2392 || h->plt.offset == (bfd_vma) -1)
2393 {
2394 Elf_Internal_Rela outrel;
2395 asection *sreloc;
2396 bfd_vma offset;
2397
2398 do_ifunc_pointer:
2399 /* Need a dynamic relocation to get the real function
2400 adddress. */
2401 offset = _bfd_elf_section_offset (output_bfd,
2402 info,
2403 input_section,
2404 rel->r_offset);
2405 if (offset == (bfd_vma) -1
2406 || offset == (bfd_vma) -2)
2407 abort ();
2408
2409 outrel.r_offset = (input_section->output_section->vma
2410 + input_section->output_offset
2411 + offset);
2412
2413 if (POINTER_LOCAL_IFUNC_P (info, h))
2414 {
2415 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2416 h->root.root.string,
2417 h->root.u.def.section->owner);
2418
2419 /* This symbol is resolved locally. */
2420 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2421
2422 if (htab->params->report_relative_reloc)
2423 _bfd_x86_elf_link_report_relative_reloc
2424 (info, input_section, h, sym,
2425 "R_386_IRELATIVE", &outrel);
2426
2427 bfd_put_32 (output_bfd,
2428 (h->root.u.def.value
2429 + h->root.u.def.section->output_section->vma
2430 + h->root.u.def.section->output_offset),
2431 contents + offset);
2432 }
2433 else
2434 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2435
2436 /* Dynamic relocations are stored in
2437 1. .rel.ifunc section in PIC object.
2438 2. .rel.got section in dynamic executable.
2439 3. .rel.iplt section in static executable. */
2440 if (bfd_link_pic (info))
2441 sreloc = htab->elf.irelifunc;
2442 else if (htab->elf.splt != NULL)
2443 sreloc = htab->elf.srelgot;
2444 else
2445 sreloc = htab->elf.irelplt;
2446 elf_append_rel (output_bfd, sreloc, &outrel);
2447
2448 /* If this reloc is against an external symbol, we
2449 do not want to fiddle with the addend. Otherwise,
2450 we need to include the symbol value so that it
2451 becomes an addend for the dynamic reloc. For an
2452 internal symbol, we have updated addend. */
2453 continue;
2454 }
2455 /* FALLTHROUGH */
2456 case R_386_PC32:
2457 case R_386_PLT32:
2458 goto do_relocation;
2459
2460 case R_386_GOTOFF:
2461 relocation -= (gotplt->output_section->vma
2462 + gotplt->output_offset);
2463 goto do_relocation;
2464 }
2465 }
2466
2467 skip_ifunc:
2468 resolved_to_zero = (eh != NULL
2469 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2470
2471 switch (r_type)
2472 {
2473 case R_386_GOT32X:
2474 case R_386_GOT32:
2475 /* Relocation is to the entry for this symbol in the global
2476 offset table. */
2477 if (htab->elf.sgot == NULL)
2478 abort ();
2479
2480 relative_reloc = false;
2481 if (h != NULL)
2482 {
2483 off = h->got.offset;
2484 if (RESOLVED_LOCALLY_P (info, h, htab))
2485 {
2486 /* We must initialize this entry in the global offset
2487 table. Since the offset must always be a multiple
2488 of 4, we use the least significant bit to record
2489 whether we have initialized it already.
2490
2491 When doing a dynamic link, we create a .rel.got
2492 relocation entry to initialize the value. This
2493 is done in the finish_dynamic_symbol routine. */
2494 if ((off & 1) != 0)
2495 off &= ~1;
2496 else
2497 {
2498 bfd_put_32 (output_bfd, relocation,
2499 htab->elf.sgot->contents + off);
2500 h->got.offset |= 1;
2501
2502 if (GENERATE_RELATIVE_RELOC_P (info, h))
2503 {
2504 /* PR ld/21402: If this symbol isn't dynamic
2505 in PIC, generate R_386_RELATIVE here. */
2506 eh->no_finish_dynamic_symbol = 1;
2507 relative_reloc = true;
2508 }
2509 }
2510 }
2511 else
2512 unresolved_reloc = false;
2513 }
2514 else
2515 {
2516 if (local_got_offsets == NULL)
2517 abort ();
2518
2519 off = local_got_offsets[r_symndx];
2520
2521 /* The offset must always be a multiple of 4. We use
2522 the least significant bit to record whether we have
2523 already generated the necessary reloc. */
2524 if ((off & 1) != 0)
2525 off &= ~1;
2526 else
2527 {
2528 bfd_put_32 (output_bfd, relocation,
2529 htab->elf.sgot->contents + off);
2530 local_got_offsets[r_symndx] |= 1;
2531
2532 if (bfd_link_pic (info))
2533 relative_reloc = true;
2534 }
2535 }
2536
2537 if (relative_reloc)
2538 {
2539 asection *s;
2540 Elf_Internal_Rela outrel;
2541
2542 s = htab->elf.srelgot;
2543 if (s == NULL)
2544 abort ();
2545
2546 outrel.r_offset = (htab->elf.sgot->output_section->vma
2547 + htab->elf.sgot->output_offset
2548 + off);
2549 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2550
2551 if (htab->params->report_relative_reloc)
2552 _bfd_x86_elf_link_report_relative_reloc
2553 (info, input_section, h, sym, "R_386_RELATIVE",
2554 &outrel);
2555
2556 elf_append_rel (output_bfd, s, &outrel);
2557 }
2558
2559 if (off >= (bfd_vma) -2)
2560 abort ();
2561
2562 relocation = (htab->elf.sgot->output_section->vma
2563 + htab->elf.sgot->output_offset + off);
2564 if (rel->r_offset > 1
2565 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2566 && *(contents + rel->r_offset - 2) != 0x8d)
2567 {
2568 if (bfd_link_pic (info))
2569 {
2570 /* For PIC, disallow R_386_GOT32 without a base
2571 register, except for "lea foo@GOT, %reg", since
2572 we don't know what the GOT base is. */
2573 const char *name;
2574
2575 disallow_got32:
2576 if (h == NULL || h->root.root.string == NULL)
2577 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2578 NULL);
2579 else
2580 name = h->root.root.string;
2581
2582 _bfd_error_handler
2583 /* xgettext:c-format */
2584 (_("%pB: direct GOT relocation %s against `%s'"
2585 " without base register can not be used"
2586 " when making a shared object"),
2587 input_bfd, howto->name, name);
2588 bfd_set_error (bfd_error_bad_value);
2589 return false;
2590 }
2591 }
2592 else
2593 {
2594 /* Subtract the .got.plt section address only with a base
2595 register. */
2596 relocation -= (htab->elf.sgotplt->output_section->vma
2597 + htab->elf.sgotplt->output_offset);
2598 }
2599
2600 break;
2601
2602 case R_386_GOTOFF:
2603 /* Relocation is relative to the start of the global offset
2604 table. */
2605
2606 /* Check to make sure it isn't a protected function or data
2607 symbol for shared library since it may not be local when
2608 used as function address or with copy relocation. We also
2609 need to make sure that a symbol is referenced locally. */
2610 if (!bfd_link_executable (info) && h)
2611 {
2612 if (!h->def_regular)
2613 {
2614 const char *v;
2615
2616 switch (ELF_ST_VISIBILITY (h->other))
2617 {
2618 case STV_HIDDEN:
2619 v = _("hidden symbol");
2620 break;
2621 case STV_INTERNAL:
2622 v = _("internal symbol");
2623 break;
2624 case STV_PROTECTED:
2625 v = _("protected symbol");
2626 break;
2627 default:
2628 v = _("symbol");
2629 break;
2630 }
2631
2632 _bfd_error_handler
2633 /* xgettext:c-format */
2634 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2635 " `%s' can not be used when making a shared object"),
2636 input_bfd, v, h->root.root.string);
2637 bfd_set_error (bfd_error_bad_value);
2638 return false;
2639 }
2640 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2641 && (h->type == STT_FUNC
2642 || h->type == STT_OBJECT)
2643 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2644 {
2645 _bfd_error_handler
2646 /* xgettext:c-format */
2647 (_("%pB: relocation R_386_GOTOFF against protected %s"
2648 " `%s' can not be used when making a shared object"),
2649 input_bfd,
2650 h->type == STT_FUNC ? "function" : "data",
2651 h->root.root.string);
2652 bfd_set_error (bfd_error_bad_value);
2653 return false;
2654 }
2655 }
2656
2657 /* Note that sgot is not involved in this
2658 calculation. We always want the start of .got.plt. If we
2659 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2660 permitted by the ABI, we might have to change this
2661 calculation. */
2662 relocation -= htab->elf.sgotplt->output_section->vma
2663 + htab->elf.sgotplt->output_offset;
2664 break;
2665
2666 case R_386_GOTPC:
2667 /* Use global offset table as symbol value. */
2668 relocation = htab->elf.sgotplt->output_section->vma
2669 + htab->elf.sgotplt->output_offset;
2670 unresolved_reloc = false;
2671 break;
2672
2673 case R_386_PLT32:
2674 /* Relocation is to the entry for this symbol in the
2675 procedure linkage table. */
2676
2677 /* Resolve a PLT32 reloc against a local symbol directly,
2678 without using the procedure linkage table. */
2679 if (h == NULL)
2680 break;
2681
2682 if ((h->plt.offset == (bfd_vma) -1
2683 && eh->plt_got.offset == (bfd_vma) -1)
2684 || htab->elf.splt == NULL)
2685 {
2686 /* We didn't make a PLT entry for this symbol. This
2687 happens when statically linking PIC code, or when
2688 using -Bsymbolic. */
2689 break;
2690 }
2691
2692 if (h->plt.offset != (bfd_vma) -1)
2693 {
2694 if (htab->plt_second != NULL)
2695 {
2696 resolved_plt = htab->plt_second;
2697 plt_offset = eh->plt_second.offset;
2698 }
2699 else
2700 {
2701 resolved_plt = htab->elf.splt;
2702 plt_offset = h->plt.offset;
2703 }
2704 }
2705 else
2706 {
2707 resolved_plt = htab->plt_got;
2708 plt_offset = eh->plt_got.offset;
2709 }
2710
2711 relocation = (resolved_plt->output_section->vma
2712 + resolved_plt->output_offset
2713 + plt_offset);
2714 unresolved_reloc = false;
2715 break;
2716
2717 case R_386_SIZE32:
2718 /* Set to symbol size. */
2719 relocation = st_size;
2720 /* Fall through. */
2721
2722 case R_386_32:
2723 case R_386_PC32:
2724 if ((input_section->flags & SEC_ALLOC) == 0
2725 || is_vxworks_tls)
2726 break;
2727
2728 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2729 false, resolved_to_zero,
2730 (r_type == R_386_PC32)))
2731 {
2732 Elf_Internal_Rela outrel;
2733 bool skip, relocate;
2734 asection *sreloc;
2735
2736 /* When generating a shared object, these relocations
2737 are copied into the output file to be resolved at run
2738 time. */
2739
2740 skip = false;
2741 relocate = false;
2742
2743 outrel.r_offset =
2744 _bfd_elf_section_offset (output_bfd, info, input_section,
2745 rel->r_offset);
2746 if (outrel.r_offset == (bfd_vma) -1)
2747 skip = true;
2748 else if (outrel.r_offset == (bfd_vma) -2)
2749 skip = true, relocate = true;
2750 outrel.r_offset += (input_section->output_section->vma
2751 + input_section->output_offset);
2752
2753 if (skip)
2754 memset (&outrel, 0, sizeof outrel);
2755 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2756 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2757 else
2758 {
2759 /* This symbol is local, or marked to become local. */
2760 relocate = true;
2761 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2762
2763 if (htab->params->report_relative_reloc)
2764 _bfd_x86_elf_link_report_relative_reloc
2765 (info, input_section, h, sym, "R_386_RELATIVE",
2766 &outrel);
2767 }
2768
2769 sreloc = elf_section_data (input_section)->sreloc;
2770
2771 if (sreloc == NULL || sreloc->contents == NULL)
2772 {
2773 r = bfd_reloc_notsupported;
2774 goto check_relocation_error;
2775 }
2776
2777 elf_append_rel (output_bfd, sreloc, &outrel);
2778
2779 /* If this reloc is against an external symbol, we do
2780 not want to fiddle with the addend. Otherwise, we
2781 need to include the symbol value so that it becomes
2782 an addend for the dynamic reloc. */
2783 if (! relocate)
2784 continue;
2785 }
2786 break;
2787
2788 case R_386_TLS_IE:
2789 if (!bfd_link_executable (info))
2790 {
2791 Elf_Internal_Rela outrel;
2792 asection *sreloc;
2793
2794 outrel.r_offset = rel->r_offset
2795 + input_section->output_section->vma
2796 + input_section->output_offset;
2797 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2798
2799 if (htab->params->report_relative_reloc)
2800 _bfd_x86_elf_link_report_relative_reloc
2801 (info, input_section, h, sym, "R_386_RELATIVE",
2802 &outrel);
2803
2804 sreloc = elf_section_data (input_section)->sreloc;
2805 if (sreloc == NULL)
2806 abort ();
2807 elf_append_rel (output_bfd, sreloc, &outrel);
2808 }
2809 /* Fall through */
2810
2811 case R_386_TLS_GD:
2812 case R_386_TLS_GOTDESC:
2813 case R_386_TLS_DESC_CALL:
2814 case R_386_TLS_IE_32:
2815 case R_386_TLS_GOTIE:
2816 tls_type = GOT_UNKNOWN;
2817 if (h == NULL && local_got_offsets)
2818 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2819 else if (h != NULL)
2820 tls_type = elf_x86_hash_entry(h)->tls_type;
2821 if (tls_type == GOT_TLS_IE)
2822 tls_type = GOT_TLS_IE_NEG;
2823
2824 r_type_tls = r_type;
2825 if (! elf_i386_tls_transition (info, input_bfd,
2826 input_section, contents,
2827 symtab_hdr, sym_hashes,
2828 &r_type_tls, tls_type, rel,
2829 relend, h, r_symndx, true))
2830 return false;
2831
2832 if (r_type_tls == R_386_TLS_LE_32)
2833 {
2834 BFD_ASSERT (! unresolved_reloc);
2835 if (r_type == R_386_TLS_GD)
2836 {
2837 unsigned int type;
2838 bfd_vma roff;
2839
2840 /* GD->LE transition. */
2841 type = *(contents + rel->r_offset - 2);
2842 if (type == 0x04)
2843 {
2844 /* Change
2845 leal foo@tlsgd(,%ebx,1), %eax
2846 call ___tls_get_addr@PLT
2847 into:
2848 movl %gs:0, %eax
2849 subl $foo@tpoff, %eax
2850 (6 byte form of subl). */
2851 roff = rel->r_offset + 5;
2852 }
2853 else
2854 {
2855 /* Change
2856 leal foo@tlsgd(%ebx), %eax
2857 call ___tls_get_addr@PLT
2858 nop
2859 or
2860 leal foo@tlsgd(%reg), %eax
2861 call *___tls_get_addr@GOT(%reg)
2862 which may be converted to
2863 addr32 call ___tls_get_addr
2864 into:
2865 movl %gs:0, %eax; subl $foo@tpoff, %eax
2866 (6 byte form of subl). */
2867 roff = rel->r_offset + 6;
2868 }
2869 memcpy (contents + roff - 8,
2870 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2871 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2872 contents + roff);
2873 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2874 rel++;
2875 wrel++;
2876 continue;
2877 }
2878 else if (r_type == R_386_TLS_GOTDESC)
2879 {
2880 /* GDesc -> LE transition.
2881 It's originally something like:
2882 leal x@tlsdesc(%ebx), %eax
2883
2884 leal x@ntpoff, %eax
2885
2886 Registers other than %eax may be set up here. */
2887
2888 unsigned int val;
2889 bfd_vma roff;
2890
2891 roff = rel->r_offset;
2892 val = bfd_get_8 (input_bfd, contents + roff - 1);
2893
2894 /* Now modify the instruction as appropriate. */
2895 /* aoliva FIXME: remove the above and xor the byte
2896 below with 0x86. */
2897 bfd_put_8 (output_bfd, val ^ 0x86,
2898 contents + roff - 1);
2899 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2900 contents + roff);
2901 continue;
2902 }
2903 else if (r_type == R_386_TLS_DESC_CALL)
2904 {
2905 /* GDesc -> LE transition.
2906 It's originally:
2907 call *(%eax)
2908 Turn it into:
2909 xchg %ax,%ax */
2910
2911 bfd_vma roff;
2912
2913 roff = rel->r_offset;
2914 bfd_put_8 (output_bfd, 0x66, contents + roff);
2915 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2916 continue;
2917 }
2918 else if (r_type == R_386_TLS_IE)
2919 {
2920 unsigned int val;
2921
2922 /* IE->LE transition:
2923 Originally it can be one of:
2924 movl foo, %eax
2925 movl foo, %reg
2926 addl foo, %reg
2927 We change it into:
2928 movl $foo, %eax
2929 movl $foo, %reg
2930 addl $foo, %reg. */
2931 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2932 if (val == 0xa1)
2933 {
2934 /* movl foo, %eax. */
2935 bfd_put_8 (output_bfd, 0xb8,
2936 contents + rel->r_offset - 1);
2937 }
2938 else
2939 {
2940 unsigned int type;
2941
2942 type = bfd_get_8 (input_bfd,
2943 contents + rel->r_offset - 2);
2944 switch (type)
2945 {
2946 case 0x8b:
2947 /* movl */
2948 bfd_put_8 (output_bfd, 0xc7,
2949 contents + rel->r_offset - 2);
2950 bfd_put_8 (output_bfd,
2951 0xc0 | ((val >> 3) & 7),
2952 contents + rel->r_offset - 1);
2953 break;
2954 case 0x03:
2955 /* addl */
2956 bfd_put_8 (output_bfd, 0x81,
2957 contents + rel->r_offset - 2);
2958 bfd_put_8 (output_bfd,
2959 0xc0 | ((val >> 3) & 7),
2960 contents + rel->r_offset - 1);
2961 break;
2962 default:
2963 BFD_FAIL ();
2964 break;
2965 }
2966 }
2967 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2968 contents + rel->r_offset);
2969 continue;
2970 }
2971 else
2972 {
2973 unsigned int val, type;
2974
2975 /* {IE_32,GOTIE}->LE transition:
2976 Originally it can be one of:
2977 subl foo(%reg1), %reg2
2978 movl foo(%reg1), %reg2
2979 addl foo(%reg1), %reg2
2980 We change it into:
2981 subl $foo, %reg2
2982 movl $foo, %reg2 (6 byte form)
2983 addl $foo, %reg2. */
2984 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2985 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2986 if (type == 0x8b)
2987 {
2988 /* movl */
2989 bfd_put_8 (output_bfd, 0xc7,
2990 contents + rel->r_offset - 2);
2991 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2992 contents + rel->r_offset - 1);
2993 }
2994 else if (type == 0x2b)
2995 {
2996 /* subl */
2997 bfd_put_8 (output_bfd, 0x81,
2998 contents + rel->r_offset - 2);
2999 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3000 contents + rel->r_offset - 1);
3001 }
3002 else if (type == 0x03)
3003 {
3004 /* addl */
3005 bfd_put_8 (output_bfd, 0x81,
3006 contents + rel->r_offset - 2);
3007 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3008 contents + rel->r_offset - 1);
3009 }
3010 else
3011 BFD_FAIL ();
3012 if (r_type == R_386_TLS_GOTIE)
3013 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3014 contents + rel->r_offset);
3015 else
3016 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3017 contents + rel->r_offset);
3018 continue;
3019 }
3020 }
3021
3022 if (htab->elf.sgot == NULL)
3023 abort ();
3024
3025 if (h != NULL)
3026 {
3027 off = h->got.offset;
3028 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3029 }
3030 else
3031 {
3032 if (local_got_offsets == NULL)
3033 abort ();
3034
3035 off = local_got_offsets[r_symndx];
3036 offplt = local_tlsdesc_gotents[r_symndx];
3037 }
3038
3039 if ((off & 1) != 0)
3040 off &= ~1;
3041 else
3042 {
3043 Elf_Internal_Rela outrel;
3044 int dr_type;
3045 asection *sreloc;
3046
3047 if (htab->elf.srelgot == NULL)
3048 abort ();
3049
3050 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3051
3052 if (GOT_TLS_GDESC_P (tls_type))
3053 {
3054 bfd_byte *loc;
3055 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3056 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3057 <= htab->elf.sgotplt->size);
3058 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3059 + htab->elf.sgotplt->output_offset
3060 + offplt
3061 + htab->sgotplt_jump_table_size);
3062 sreloc = htab->elf.srelplt;
3063 loc = sreloc->contents;
3064 loc += (htab->next_tls_desc_index++
3065 * sizeof (Elf32_External_Rel));
3066 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3067 <= sreloc->contents + sreloc->size);
3068 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3069 if (indx == 0)
3070 {
3071 BFD_ASSERT (! unresolved_reloc);
3072 bfd_put_32 (output_bfd,
3073 relocation - _bfd_x86_elf_dtpoff_base (info),
3074 htab->elf.sgotplt->contents + offplt
3075 + htab->sgotplt_jump_table_size + 4);
3076 }
3077 else
3078 {
3079 bfd_put_32 (output_bfd, 0,
3080 htab->elf.sgotplt->contents + offplt
3081 + htab->sgotplt_jump_table_size + 4);
3082 }
3083 }
3084
3085 sreloc = htab->elf.srelgot;
3086
3087 outrel.r_offset = (htab->elf.sgot->output_section->vma
3088 + htab->elf.sgot->output_offset + off);
3089
3090 if (GOT_TLS_GD_P (tls_type))
3091 dr_type = R_386_TLS_DTPMOD32;
3092 else if (GOT_TLS_GDESC_P (tls_type))
3093 goto dr_done;
3094 else if (tls_type == GOT_TLS_IE_POS)
3095 dr_type = R_386_TLS_TPOFF;
3096 else
3097 dr_type = R_386_TLS_TPOFF32;
3098
3099 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3100 bfd_put_32 (output_bfd,
3101 relocation - _bfd_x86_elf_dtpoff_base (info),
3102 htab->elf.sgot->contents + off);
3103 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3104 bfd_put_32 (output_bfd,
3105 _bfd_x86_elf_dtpoff_base (info) - relocation,
3106 htab->elf.sgot->contents + off);
3107 else if (dr_type != R_386_TLS_DESC)
3108 bfd_put_32 (output_bfd, 0,
3109 htab->elf.sgot->contents + off);
3110 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3111
3112 elf_append_rel (output_bfd, sreloc, &outrel);
3113
3114 if (GOT_TLS_GD_P (tls_type))
3115 {
3116 if (indx == 0)
3117 {
3118 BFD_ASSERT (! unresolved_reloc);
3119 bfd_put_32 (output_bfd,
3120 relocation - _bfd_x86_elf_dtpoff_base (info),
3121 htab->elf.sgot->contents + off + 4);
3122 }
3123 else
3124 {
3125 bfd_put_32 (output_bfd, 0,
3126 htab->elf.sgot->contents + off + 4);
3127 outrel.r_info = ELF32_R_INFO (indx,
3128 R_386_TLS_DTPOFF32);
3129 outrel.r_offset += 4;
3130 elf_append_rel (output_bfd, sreloc, &outrel);
3131 }
3132 }
3133 else if (tls_type == GOT_TLS_IE_BOTH)
3134 {
3135 bfd_put_32 (output_bfd,
3136 (indx == 0
3137 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3138 : 0),
3139 htab->elf.sgot->contents + off + 4);
3140 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3141 outrel.r_offset += 4;
3142 elf_append_rel (output_bfd, sreloc, &outrel);
3143 }
3144
3145 dr_done:
3146 if (h != NULL)
3147 h->got.offset |= 1;
3148 else
3149 local_got_offsets[r_symndx] |= 1;
3150 }
3151
3152 if (off >= (bfd_vma) -2
3153 && ! GOT_TLS_GDESC_P (tls_type))
3154 abort ();
3155 if (r_type_tls == R_386_TLS_GOTDESC
3156 || r_type_tls == R_386_TLS_DESC_CALL)
3157 {
3158 relocation = htab->sgotplt_jump_table_size + offplt;
3159 unresolved_reloc = false;
3160 }
3161 else if (r_type_tls == r_type)
3162 {
3163 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3164 + htab->elf.sgotplt->output_offset;
3165 relocation = htab->elf.sgot->output_section->vma
3166 + htab->elf.sgot->output_offset + off - g_o_t;
3167 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3168 && tls_type == GOT_TLS_IE_BOTH)
3169 relocation += 4;
3170 if (r_type == R_386_TLS_IE)
3171 relocation += g_o_t;
3172 unresolved_reloc = false;
3173 }
3174 else if (r_type == R_386_TLS_GD)
3175 {
3176 unsigned int val, type;
3177 bfd_vma roff;
3178
3179 /* GD->IE transition. */
3180 type = *(contents + rel->r_offset - 2);
3181 val = *(contents + rel->r_offset - 1);
3182 if (type == 0x04)
3183 {
3184 /* Change
3185 leal foo@tlsgd(,%ebx,1), %eax
3186 call ___tls_get_addr@PLT
3187 into:
3188 movl %gs:0, %eax
3189 subl $foo@gottpoff(%ebx), %eax. */
3190 val >>= 3;
3191 roff = rel->r_offset - 3;
3192 }
3193 else
3194 {
3195 /* Change
3196 leal foo@tlsgd(%ebx), %eax
3197 call ___tls_get_addr@PLT
3198 nop
3199 or
3200 leal foo@tlsgd(%reg), %eax
3201 call *___tls_get_addr@GOT(%reg)
3202 which may be converted to
3203 addr32 call ___tls_get_addr
3204 into:
3205 movl %gs:0, %eax;
3206 subl $foo@gottpoff(%reg), %eax. */
3207 roff = rel->r_offset - 2;
3208 }
3209 memcpy (contents + roff,
3210 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3211 contents[roff + 7] = 0x80 | (val & 7);
3212 /* If foo is used only with foo@gotntpoff(%reg) and
3213 foo@indntpoff, but not with foo@gottpoff(%reg), change
3214 subl $foo@gottpoff(%reg), %eax
3215 into:
3216 addl $foo@gotntpoff(%reg), %eax. */
3217 if (tls_type == GOT_TLS_IE_POS)
3218 contents[roff + 6] = 0x03;
3219 bfd_put_32 (output_bfd,
3220 htab->elf.sgot->output_section->vma
3221 + htab->elf.sgot->output_offset + off
3222 - htab->elf.sgotplt->output_section->vma
3223 - htab->elf.sgotplt->output_offset,
3224 contents + roff + 8);
3225 /* Skip R_386_PLT32 and R_386_GOT32X. */
3226 rel++;
3227 wrel++;
3228 continue;
3229 }
3230 else if (r_type == R_386_TLS_GOTDESC)
3231 {
3232 /* GDesc -> IE transition.
3233 It's originally something like:
3234 leal x@tlsdesc(%ebx), %eax
3235
3236 Change it to:
3237 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3238 or:
3239 movl x@gottpoff(%ebx), %eax # before negl %eax
3240
3241 Registers other than %eax may be set up here. */
3242
3243 bfd_vma roff;
3244
3245 /* First, make sure it's a leal adding ebx to a 32-bit
3246 offset into any register, although it's probably
3247 almost always going to be eax. */
3248 roff = rel->r_offset;
3249
3250 /* Now modify the instruction as appropriate. */
3251 /* To turn a leal into a movl in the form we use it, it
3252 suffices to change the first byte from 0x8d to 0x8b.
3253 aoliva FIXME: should we decide to keep the leal, all
3254 we have to do is remove the statement below, and
3255 adjust the relaxation of R_386_TLS_DESC_CALL. */
3256 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3257
3258 if (tls_type == GOT_TLS_IE_BOTH)
3259 off += 4;
3260
3261 bfd_put_32 (output_bfd,
3262 htab->elf.sgot->output_section->vma
3263 + htab->elf.sgot->output_offset + off
3264 - htab->elf.sgotplt->output_section->vma
3265 - htab->elf.sgotplt->output_offset,
3266 contents + roff);
3267 continue;
3268 }
3269 else if (r_type == R_386_TLS_DESC_CALL)
3270 {
3271 /* GDesc -> IE transition.
3272 It's originally:
3273 call *(%eax)
3274
3275 Change it to:
3276 xchg %ax,%ax
3277 or
3278 negl %eax
3279 depending on how we transformed the TLS_GOTDESC above.
3280 */
3281
3282 bfd_vma roff;
3283
3284 roff = rel->r_offset;
3285
3286 /* Now modify the instruction as appropriate. */
3287 if (tls_type != GOT_TLS_IE_NEG)
3288 {
3289 /* xchg %ax,%ax */
3290 bfd_put_8 (output_bfd, 0x66, contents + roff);
3291 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3292 }
3293 else
3294 {
3295 /* negl %eax */
3296 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3297 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3298 }
3299
3300 continue;
3301 }
3302 else
3303 BFD_ASSERT (false);
3304 break;
3305
3306 case R_386_TLS_LDM:
3307 if (! elf_i386_tls_transition (info, input_bfd,
3308 input_section, contents,
3309 symtab_hdr, sym_hashes,
3310 &r_type, GOT_UNKNOWN, rel,
3311 relend, h, r_symndx, true))
3312 return false;
3313
3314 if (r_type != R_386_TLS_LDM)
3315 {
3316 /* LD->LE transition. Change
3317 leal foo@tlsldm(%ebx) %eax
3318 call ___tls_get_addr@PLT
3319 into:
3320 movl %gs:0, %eax
3321 nop
3322 leal 0(%esi,1), %esi
3323 or change
3324 leal foo@tlsldm(%reg) %eax
3325 call *___tls_get_addr@GOT(%reg)
3326 which may be converted to
3327 addr32 call ___tls_get_addr
3328 into:
3329 movl %gs:0, %eax
3330 leal 0(%esi), %esi */
3331 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3332 if (*(contents + rel->r_offset + 4) == 0xff
3333 || *(contents + rel->r_offset + 4) == 0x67)
3334 memcpy (contents + rel->r_offset - 2,
3335 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3336 else
3337 memcpy (contents + rel->r_offset - 2,
3338 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3339 /* Skip R_386_PC32/R_386_PLT32. */
3340 rel++;
3341 wrel++;
3342 continue;
3343 }
3344
3345 if (htab->elf.sgot == NULL)
3346 abort ();
3347
3348 off = htab->tls_ld_or_ldm_got.offset;
3349 if (off & 1)
3350 off &= ~1;
3351 else
3352 {
3353 Elf_Internal_Rela outrel;
3354
3355 if (htab->elf.srelgot == NULL)
3356 abort ();
3357
3358 outrel.r_offset = (htab->elf.sgot->output_section->vma
3359 + htab->elf.sgot->output_offset + off);
3360
3361 bfd_put_32 (output_bfd, 0,
3362 htab->elf.sgot->contents + off);
3363 bfd_put_32 (output_bfd, 0,
3364 htab->elf.sgot->contents + off + 4);
3365 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3366 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3367 htab->tls_ld_or_ldm_got.offset |= 1;
3368 }
3369 relocation = htab->elf.sgot->output_section->vma
3370 + htab->elf.sgot->output_offset + off
3371 - htab->elf.sgotplt->output_section->vma
3372 - htab->elf.sgotplt->output_offset;
3373 unresolved_reloc = false;
3374 break;
3375
3376 case R_386_TLS_LDO_32:
3377 if (!bfd_link_executable (info)
3378 || (input_section->flags & SEC_CODE) == 0)
3379 relocation -= _bfd_x86_elf_dtpoff_base (info);
3380 else
3381 /* When converting LDO to LE, we must negate. */
3382 relocation = -elf_i386_tpoff (info, relocation);
3383 break;
3384
3385 case R_386_TLS_LE_32:
3386 case R_386_TLS_LE:
3387 if (!bfd_link_executable (info))
3388 {
3389 Elf_Internal_Rela outrel;
3390 asection *sreloc;
3391
3392 outrel.r_offset = rel->r_offset
3393 + input_section->output_section->vma
3394 + input_section->output_offset;
3395 if (h != NULL && h->dynindx != -1)
3396 indx = h->dynindx;
3397 else
3398 indx = 0;
3399 if (r_type == R_386_TLS_LE_32)
3400 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3401 else
3402 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3403 sreloc = elf_section_data (input_section)->sreloc;
3404 if (sreloc == NULL)
3405 abort ();
3406 elf_append_rel (output_bfd, sreloc, &outrel);
3407 if (indx)
3408 continue;
3409 else if (r_type == R_386_TLS_LE_32)
3410 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3411 else
3412 relocation -= _bfd_x86_elf_dtpoff_base (info);
3413 }
3414 else if (r_type == R_386_TLS_LE_32)
3415 relocation = elf_i386_tpoff (info, relocation);
3416 else
3417 relocation = -elf_i386_tpoff (info, relocation);
3418 break;
3419
3420 default:
3421 break;
3422 }
3423
3424 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3425 because such sections are not SEC_ALLOC and thus ld.so will
3426 not process them. */
3427 if (unresolved_reloc
3428 && !((input_section->flags & SEC_DEBUGGING) != 0
3429 && h->def_dynamic)
3430 && _bfd_elf_section_offset (output_bfd, info, input_section,
3431 rel->r_offset) != (bfd_vma) -1)
3432 {
3433 _bfd_error_handler
3434 /* xgettext:c-format */
3435 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3436 input_bfd,
3437 input_section,
3438 (uint64_t) rel->r_offset,
3439 howto->name,
3440 h->root.root.string);
3441 return false;
3442 }
3443
3444 do_relocation:
3445 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3446 contents, rel->r_offset,
3447 relocation, 0);
3448
3449 check_relocation_error:
3450 if (r != bfd_reloc_ok)
3451 {
3452 const char *name;
3453
3454 if (h != NULL)
3455 name = h->root.root.string;
3456 else
3457 {
3458 name = bfd_elf_string_from_elf_section (input_bfd,
3459 symtab_hdr->sh_link,
3460 sym->st_name);
3461 if (name == NULL)
3462 return false;
3463 if (*name == '\0')
3464 name = bfd_section_name (sec);
3465 }
3466
3467 if (r == bfd_reloc_overflow)
3468 (*info->callbacks->reloc_overflow)
3469 (info, (h ? &h->root : NULL), name, howto->name,
3470 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3471 else
3472 {
3473 _bfd_error_handler
3474 /* xgettext:c-format */
3475 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3476 input_bfd, input_section,
3477 (uint64_t) rel->r_offset, name, (int) r);
3478 return false;
3479 }
3480 }
3481
3482 if (wrel != rel)
3483 *wrel = *rel;
3484 }
3485
3486 if (wrel != rel)
3487 {
3488 Elf_Internal_Shdr *rel_hdr;
3489 size_t deleted = rel - wrel;
3490
3491 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3492 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3493 if (rel_hdr->sh_size == 0)
3494 {
3495 /* It is too late to remove an empty reloc section. Leave
3496 one NONE reloc.
3497 ??? What is wrong with an empty section??? */
3498 rel_hdr->sh_size = rel_hdr->sh_entsize;
3499 deleted -= 1;
3500 }
3501 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3502 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3503 input_section->reloc_count -= deleted;
3504 }
3505
3506 return true;
3507 }
3508
3509 /* Finish up dynamic symbol handling. We set the contents of various
3510 dynamic sections here. */
3511
3512 static bool
3513 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3514 struct bfd_link_info *info,
3515 struct elf_link_hash_entry *h,
3516 Elf_Internal_Sym *sym)
3517 {
3518 struct elf_x86_link_hash_table *htab;
3519 unsigned plt_entry_size;
3520 struct elf_x86_link_hash_entry *eh;
3521 bool local_undefweak;
3522 bool use_plt_second;
3523
3524 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3525 if (htab == NULL)
3526 return false;
3527
3528 plt_entry_size = htab->plt.plt_entry_size;
3529
3530 /* Use the second PLT section only if there is .plt section. */
3531 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3532
3533 eh = (struct elf_x86_link_hash_entry *) h;
3534 if (eh->no_finish_dynamic_symbol)
3535 abort ();
3536
3537 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3538 resolved undefined weak symbols in executable so that their
3539 references have value 0 at run-time. */
3540 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3541
3542 if (h->plt.offset != (bfd_vma) -1)
3543 {
3544 bfd_vma plt_index, plt_offset;
3545 bfd_vma got_offset;
3546 Elf_Internal_Rela rel;
3547 bfd_byte *loc;
3548 asection *plt, *resolved_plt, *gotplt, *relplt;
3549
3550 /* When building a static executable, use .iplt, .igot.plt and
3551 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3552 if (htab->elf.splt != NULL)
3553 {
3554 plt = htab->elf.splt;
3555 gotplt = htab->elf.sgotplt;
3556 relplt = htab->elf.srelplt;
3557 }
3558 else
3559 {
3560 plt = htab->elf.iplt;
3561 gotplt = htab->elf.igotplt;
3562 relplt = htab->elf.irelplt;
3563 }
3564
3565 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3566
3567 /* Get the index in the procedure linkage table which
3568 corresponds to this symbol. This is the index of this symbol
3569 in all the symbols for which we are making plt entries. The
3570 first entry in the procedure linkage table is reserved.
3571
3572 Get the offset into the .got table of the entry that
3573 corresponds to this function. Each .got entry is 4 bytes.
3574 The first three are reserved.
3575
3576 For static executables, we don't reserve anything. */
3577
3578 if (plt == htab->elf.splt)
3579 {
3580 got_offset = (h->plt.offset / plt_entry_size
3581 - htab->plt.has_plt0);
3582 got_offset = (got_offset + 3) * 4;
3583 }
3584 else
3585 {
3586 got_offset = h->plt.offset / plt_entry_size;
3587 got_offset = got_offset * 4;
3588 }
3589
3590 /* Fill in the entry in the procedure linkage table and update
3591 the first slot. */
3592 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3593 plt_entry_size);
3594
3595 if (use_plt_second)
3596 {
3597 const bfd_byte *plt_entry;
3598 if (bfd_link_pic (info))
3599 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3600 else
3601 plt_entry = htab->non_lazy_plt->plt_entry;
3602 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3603 plt_entry, htab->non_lazy_plt->plt_entry_size);
3604
3605 resolved_plt = htab->plt_second;
3606 plt_offset = eh->plt_second.offset;
3607 }
3608 else
3609 {
3610 resolved_plt = plt;
3611 plt_offset = h->plt.offset;
3612 }
3613
3614 if (! bfd_link_pic (info))
3615 {
3616 bfd_put_32 (output_bfd,
3617 (gotplt->output_section->vma
3618 + gotplt->output_offset
3619 + got_offset),
3620 resolved_plt->contents + plt_offset
3621 + htab->plt.plt_got_offset);
3622
3623 if (htab->elf.target_os == is_vxworks)
3624 {
3625 int s, k, reloc_index;
3626
3627 /* Create the R_386_32 relocation referencing the GOT
3628 for this PLT entry. */
3629
3630 /* S: Current slot number (zero-based). */
3631 s = ((h->plt.offset - htab->plt.plt_entry_size)
3632 / htab->plt.plt_entry_size);
3633 /* K: Number of relocations for PLTResolve. */
3634 if (bfd_link_pic (info))
3635 k = PLTRESOLVE_RELOCS_SHLIB;
3636 else
3637 k = PLTRESOLVE_RELOCS;
3638 /* Skip the PLTresolve relocations, and the relocations for
3639 the other PLT slots. */
3640 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3641 loc = (htab->srelplt2->contents + reloc_index
3642 * sizeof (Elf32_External_Rel));
3643
3644 rel.r_offset = (plt->output_section->vma
3645 + plt->output_offset
3646 + h->plt.offset + 2),
3647 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3648 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3649
3650 /* Create the R_386_32 relocation referencing the beginning of
3651 the PLT for this GOT entry. */
3652 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3653 + htab->elf.sgotplt->output_offset
3654 + got_offset);
3655 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3656 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3657 loc + sizeof (Elf32_External_Rel));
3658 }
3659 }
3660 else
3661 {
3662 bfd_put_32 (output_bfd, got_offset,
3663 resolved_plt->contents + plt_offset
3664 + htab->plt.plt_got_offset);
3665 }
3666
3667 /* Fill in the entry in the global offset table. Leave the entry
3668 as zero for undefined weak symbol in PIE. No PLT relocation
3669 against undefined weak symbol in PIE. */
3670 if (!local_undefweak)
3671 {
3672 if (htab->plt.has_plt0)
3673 bfd_put_32 (output_bfd,
3674 (plt->output_section->vma
3675 + plt->output_offset
3676 + h->plt.offset
3677 + htab->lazy_plt->plt_lazy_offset),
3678 gotplt->contents + got_offset);
3679
3680 /* Fill in the entry in the .rel.plt section. */
3681 rel.r_offset = (gotplt->output_section->vma
3682 + gotplt->output_offset
3683 + got_offset);
3684 if (PLT_LOCAL_IFUNC_P (info, h))
3685 {
3686 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3687 h->root.root.string,
3688 h->root.u.def.section->owner);
3689
3690 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3691 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3692 in the .got.plt section. */
3693 bfd_put_32 (output_bfd,
3694 (h->root.u.def.value
3695 + h->root.u.def.section->output_section->vma
3696 + h->root.u.def.section->output_offset),
3697 gotplt->contents + got_offset);
3698 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3699
3700 if (htab->params->report_relative_reloc)
3701 _bfd_x86_elf_link_report_relative_reloc
3702 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3703
3704 /* R_386_IRELATIVE comes last. */
3705 plt_index = htab->next_irelative_index--;
3706 }
3707 else
3708 {
3709 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3710 plt_index = htab->next_jump_slot_index++;
3711 }
3712
3713 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3714 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3715
3716 /* Don't fill the second and third slots in PLT entry for
3717 static executables nor without PLT0. */
3718 if (plt == htab->elf.splt && htab->plt.has_plt0)
3719 {
3720 bfd_put_32 (output_bfd,
3721 plt_index * sizeof (Elf32_External_Rel),
3722 plt->contents + h->plt.offset
3723 + htab->lazy_plt->plt_reloc_offset);
3724 bfd_put_32 (output_bfd,
3725 - (h->plt.offset
3726 + htab->lazy_plt->plt_plt_offset + 4),
3727 (plt->contents + h->plt.offset
3728 + htab->lazy_plt->plt_plt_offset));
3729 }
3730 }
3731 }
3732 else if (eh->plt_got.offset != (bfd_vma) -1)
3733 {
3734 bfd_vma got_offset, plt_offset;
3735 asection *plt, *got, *gotplt;
3736 const bfd_byte *got_plt_entry;
3737
3738 /* Set the entry in the GOT procedure linkage table. */
3739 plt = htab->plt_got;
3740 got = htab->elf.sgot;
3741 gotplt = htab->elf.sgotplt;
3742 got_offset = h->got.offset;
3743
3744 if (got_offset == (bfd_vma) -1
3745 || plt == NULL
3746 || got == NULL
3747 || gotplt == NULL)
3748 abort ();
3749
3750 /* Fill in the entry in the GOT procedure linkage table. */
3751 if (! bfd_link_pic (info))
3752 {
3753 got_plt_entry = htab->non_lazy_plt->plt_entry;
3754 got_offset += got->output_section->vma + got->output_offset;
3755 }
3756 else
3757 {
3758 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3759 got_offset += (got->output_section->vma
3760 + got->output_offset
3761 - gotplt->output_section->vma
3762 - gotplt->output_offset);
3763 }
3764
3765 plt_offset = eh->plt_got.offset;
3766 memcpy (plt->contents + plt_offset, got_plt_entry,
3767 htab->non_lazy_plt->plt_entry_size);
3768 bfd_put_32 (output_bfd, got_offset,
3769 (plt->contents + plt_offset
3770 + htab->non_lazy_plt->plt_got_offset));
3771 }
3772
3773 if (!local_undefweak
3774 && !h->def_regular
3775 && (h->plt.offset != (bfd_vma) -1
3776 || eh->plt_got.offset != (bfd_vma) -1))
3777 {
3778 /* Mark the symbol as undefined, rather than as defined in
3779 the .plt section. Leave the value if there were any
3780 relocations where pointer equality matters (this is a clue
3781 for the dynamic linker, to make function pointer
3782 comparisons work between an application and shared
3783 library), otherwise set it to zero. If a function is only
3784 called from a binary, there is no need to slow down
3785 shared libraries because of that. */
3786 sym->st_shndx = SHN_UNDEF;
3787 if (!h->pointer_equality_needed)
3788 sym->st_value = 0;
3789 }
3790
3791 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3792
3793 /* Don't generate dynamic GOT relocation against undefined weak
3794 symbol in executable. */
3795 if (h->got.offset != (bfd_vma) -1
3796 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3797 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3798 && !local_undefweak)
3799 {
3800 Elf_Internal_Rela rel;
3801 asection *relgot = htab->elf.srelgot;
3802 const char *relative_reloc_name = NULL;
3803
3804 /* This symbol has an entry in the global offset table. Set it
3805 up. */
3806
3807 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3808 abort ();
3809
3810 rel.r_offset = (htab->elf.sgot->output_section->vma
3811 + htab->elf.sgot->output_offset
3812 + (h->got.offset & ~(bfd_vma) 1));
3813
3814 /* If this is a static link, or it is a -Bsymbolic link and the
3815 symbol is defined locally or was forced to be local because
3816 of a version file, we just want to emit a RELATIVE reloc.
3817 The entry in the global offset table will already have been
3818 initialized in the relocate_section function. */
3819 if (h->def_regular
3820 && h->type == STT_GNU_IFUNC)
3821 {
3822 if (h->plt.offset == (bfd_vma) -1)
3823 {
3824 /* STT_GNU_IFUNC is referenced without PLT. */
3825 if (htab->elf.splt == NULL)
3826 {
3827 /* use .rel[a].iplt section to store .got relocations
3828 in static executable. */
3829 relgot = htab->elf.irelplt;
3830 }
3831 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3832 {
3833 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3834 h->root.root.string,
3835 h->root.u.def.section->owner);
3836
3837 bfd_put_32 (output_bfd,
3838 (h->root.u.def.value
3839 + h->root.u.def.section->output_section->vma
3840 + h->root.u.def.section->output_offset),
3841 htab->elf.sgot->contents + h->got.offset);
3842 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3843 relative_reloc_name = "R_386_IRELATIVE";
3844 }
3845 else
3846 goto do_glob_dat;
3847 }
3848 else if (bfd_link_pic (info))
3849 {
3850 /* Generate R_386_GLOB_DAT. */
3851 goto do_glob_dat;
3852 }
3853 else
3854 {
3855 asection *plt;
3856 bfd_vma plt_offset;
3857
3858 if (!h->pointer_equality_needed)
3859 abort ();
3860
3861 /* For non-shared object, we can't use .got.plt, which
3862 contains the real function addres if we need pointer
3863 equality. We load the GOT entry with the PLT entry. */
3864 if (htab->plt_second != NULL)
3865 {
3866 plt = htab->plt_second;
3867 plt_offset = eh->plt_second.offset;
3868 }
3869 else
3870 {
3871 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3872 plt_offset = h->plt.offset;
3873 }
3874 bfd_put_32 (output_bfd,
3875 (plt->output_section->vma
3876 + plt->output_offset + plt_offset),
3877 htab->elf.sgot->contents + h->got.offset);
3878 return true;
3879 }
3880 }
3881 else if (bfd_link_pic (info)
3882 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3883 {
3884 BFD_ASSERT((h->got.offset & 1) != 0);
3885 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3886 relative_reloc_name = "R_386_RELATIVE";
3887 }
3888 else
3889 {
3890 BFD_ASSERT((h->got.offset & 1) == 0);
3891 do_glob_dat:
3892 bfd_put_32 (output_bfd, (bfd_vma) 0,
3893 htab->elf.sgot->contents + h->got.offset);
3894 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3895 }
3896
3897 if (relative_reloc_name != NULL
3898 && htab->params->report_relative_reloc)
3899 _bfd_x86_elf_link_report_relative_reloc
3900 (info, relgot, h, sym, relative_reloc_name, &rel);
3901
3902 elf_append_rel (output_bfd, relgot, &rel);
3903 }
3904
3905 if (h->needs_copy)
3906 {
3907 Elf_Internal_Rela rel;
3908 asection *s;
3909
3910 /* This symbol needs a copy reloc. Set it up. */
3911 VERIFY_COPY_RELOC (h, htab)
3912
3913 rel.r_offset = (h->root.u.def.value
3914 + h->root.u.def.section->output_section->vma
3915 + h->root.u.def.section->output_offset);
3916 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3917 if (h->root.u.def.section == htab->elf.sdynrelro)
3918 s = htab->elf.sreldynrelro;
3919 else
3920 s = htab->elf.srelbss;
3921 elf_append_rel (output_bfd, s, &rel);
3922 }
3923
3924 return true;
3925 }
3926
3927 /* Finish up local dynamic symbol handling. We set the contents of
3928 various dynamic sections here. */
3929
3930 static int
3931 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3932 {
3933 struct elf_link_hash_entry *h
3934 = (struct elf_link_hash_entry *) *slot;
3935 struct bfd_link_info *info
3936 = (struct bfd_link_info *) inf;
3937
3938 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3939 h, NULL);
3940 }
3941
3942 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3943 here since undefined weak symbol may not be dynamic and may not be
3944 called for elf_i386_finish_dynamic_symbol. */
3945
3946 static bool
3947 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3948 void *inf)
3949 {
3950 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3951 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3952
3953 if (h->root.type != bfd_link_hash_undefweak
3954 || h->dynindx != -1)
3955 return true;
3956
3957 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3958 info, h, NULL);
3959 }
3960
3961 /* Used to decide how to sort relocs in an optimal manner for the
3962 dynamic linker, before writing them out. */
3963
3964 static enum elf_reloc_type_class
3965 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3966 const asection *rel_sec ATTRIBUTE_UNUSED,
3967 const Elf_Internal_Rela *rela)
3968 {
3969 bfd *abfd = info->output_bfd;
3970 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3971 struct elf_link_hash_table *htab = elf_hash_table (info);
3972
3973 if (htab->dynsym != NULL
3974 && htab->dynsym->contents != NULL)
3975 {
3976 /* Check relocation against STT_GNU_IFUNC symbol if there are
3977 dynamic symbols. */
3978 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3979 if (r_symndx != STN_UNDEF)
3980 {
3981 Elf_Internal_Sym sym;
3982 if (!bed->s->swap_symbol_in (abfd,
3983 (htab->dynsym->contents
3984 + r_symndx * sizeof (Elf32_External_Sym)),
3985 0, &sym))
3986 abort ();
3987
3988 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3989 return reloc_class_ifunc;
3990 }
3991 }
3992
3993 switch (ELF32_R_TYPE (rela->r_info))
3994 {
3995 case R_386_IRELATIVE:
3996 return reloc_class_ifunc;
3997 case R_386_RELATIVE:
3998 return reloc_class_relative;
3999 case R_386_JUMP_SLOT:
4000 return reloc_class_plt;
4001 case R_386_COPY:
4002 return reloc_class_copy;
4003 default:
4004 return reloc_class_normal;
4005 }
4006 }
4007
4008 /* Finish up the dynamic sections. */
4009
4010 static bool
4011 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4012 struct bfd_link_info *info)
4013 {
4014 struct elf_x86_link_hash_table *htab;
4015
4016 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4017 if (htab == NULL)
4018 return false;
4019
4020 if (!htab->elf.dynamic_sections_created)
4021 return true;
4022
4023 if (htab->elf.splt && htab->elf.splt->size > 0)
4024 {
4025 if (bfd_is_abs_section (htab->elf.splt->output_section))
4026 {
4027 info->callbacks->einfo
4028 (_("%F%P: discarded output section: `%pA'\n"),
4029 htab->elf.splt);
4030 return false;
4031 }
4032
4033 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4034 really seem like the right value. */
4035 elf_section_data (htab->elf.splt->output_section)
4036 ->this_hdr.sh_entsize = 4;
4037
4038 if (htab->plt.has_plt0)
4039 {
4040 /* Fill in the special first entry in the procedure linkage
4041 table. */
4042 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4043 htab->lazy_plt->plt0_entry_size);
4044 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4045 htab->plt0_pad_byte,
4046 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4047 if (!bfd_link_pic (info))
4048 {
4049 bfd_put_32 (output_bfd,
4050 (htab->elf.sgotplt->output_section->vma
4051 + htab->elf.sgotplt->output_offset
4052 + 4),
4053 htab->elf.splt->contents
4054 + htab->lazy_plt->plt0_got1_offset);
4055 bfd_put_32 (output_bfd,
4056 (htab->elf.sgotplt->output_section->vma
4057 + htab->elf.sgotplt->output_offset
4058 + 8),
4059 htab->elf.splt->contents
4060 + htab->lazy_plt->plt0_got2_offset);
4061
4062 if (htab->elf.target_os == is_vxworks)
4063 {
4064 Elf_Internal_Rela rel;
4065 int num_plts = (htab->elf.splt->size
4066 / htab->plt.plt_entry_size) - 1;
4067 unsigned char *p;
4068 asection *srelplt2 = htab->srelplt2;
4069
4070 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4071 + 4. On IA32 we use REL relocations so the
4072 addend goes in the PLT directly. */
4073 rel.r_offset = (htab->elf.splt->output_section->vma
4074 + htab->elf.splt->output_offset
4075 + htab->lazy_plt->plt0_got1_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 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4081 + 8. */
4082 rel.r_offset = (htab->elf.splt->output_section->vma
4083 + htab->elf.splt->output_offset
4084 + htab->lazy_plt->plt0_got2_offset);
4085 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4086 R_386_32);
4087 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4088 srelplt2->contents +
4089 sizeof (Elf32_External_Rel));
4090 /* Correct the .rel.plt.unloaded relocations. */
4091 p = srelplt2->contents;
4092 if (bfd_link_pic (info))
4093 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4094 else
4095 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4096
4097 for (; num_plts; num_plts--)
4098 {
4099 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4100 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4101 R_386_32);
4102 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4103 p += sizeof (Elf32_External_Rel);
4104
4105 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4106 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4107 R_386_32);
4108 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4109 p += sizeof (Elf32_External_Rel);
4110 }
4111 }
4112 }
4113 }
4114 }
4115
4116 /* Fill PLT entries for undefined weak symbols in PIE. */
4117 if (bfd_link_pie (info))
4118 bfd_hash_traverse (&info->hash->table,
4119 elf_i386_pie_finish_undefweak_symbol,
4120 info);
4121
4122 return true;
4123 }
4124
4125 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4126 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4127 It has to be done before elf_link_sort_relocs is called so that
4128 dynamic relocations are properly sorted. */
4129
4130 static bool
4131 elf_i386_output_arch_local_syms
4132 (bfd *output_bfd ATTRIBUTE_UNUSED,
4133 struct bfd_link_info *info,
4134 void *flaginfo ATTRIBUTE_UNUSED,
4135 int (*func) (void *, const char *,
4136 Elf_Internal_Sym *,
4137 asection *,
4138 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4139 {
4140 struct elf_x86_link_hash_table *htab
4141 = elf_x86_hash_table (info, I386_ELF_DATA);
4142 if (htab == NULL)
4143 return false;
4144
4145 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4146 htab_traverse (htab->loc_hash_table,
4147 elf_i386_finish_local_dynamic_symbol,
4148 info);
4149
4150 return true;
4151 }
4152
4153 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4154 dynamic relocations. */
4155
4156 static long
4157 elf_i386_get_synthetic_symtab (bfd *abfd,
4158 long symcount ATTRIBUTE_UNUSED,
4159 asymbol **syms ATTRIBUTE_UNUSED,
4160 long dynsymcount,
4161 asymbol **dynsyms,
4162 asymbol **ret)
4163 {
4164 long count, i, n;
4165 int j;
4166 bfd_byte *plt_contents;
4167 long relsize;
4168 const struct elf_x86_lazy_plt_layout *lazy_plt;
4169 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4170 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4171 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4172 asection *plt;
4173 bfd_vma got_addr;
4174 enum elf_x86_plt_type plt_type;
4175 struct elf_x86_plt plts[] =
4176 {
4177 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4178 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4179 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4180 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4181 };
4182
4183 *ret = NULL;
4184
4185 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4186 return 0;
4187
4188 if (dynsymcount <= 0)
4189 return 0;
4190
4191 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4192 if (relsize <= 0)
4193 return -1;
4194
4195 non_lazy_plt = NULL;
4196 /* Silence GCC 6. */
4197 lazy_plt = NULL;
4198 non_lazy_ibt_plt = NULL;
4199 lazy_ibt_plt = NULL;
4200 switch (get_elf_backend_data (abfd)->target_os)
4201 {
4202 case is_normal:
4203 case is_solaris:
4204 non_lazy_plt = &elf_i386_non_lazy_plt;
4205 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4206 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4207 /* Fall through */
4208 case is_vxworks:
4209 lazy_plt = &elf_i386_lazy_plt;
4210 break;
4211 default:
4212 abort ();
4213 }
4214
4215 got_addr = 0;
4216
4217 count = 0;
4218 for (j = 0; plts[j].name != NULL; j++)
4219 {
4220 plt = bfd_get_section_by_name (abfd, plts[j].name);
4221 if (plt == NULL || plt->size == 0)
4222 continue;
4223
4224 /* Get the PLT section contents. */
4225 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4226 if (plt_contents == NULL)
4227 break;
4228 if (!bfd_get_section_contents (abfd, (asection *) plt,
4229 plt_contents, 0, plt->size))
4230 {
4231 free (plt_contents);
4232 break;
4233 }
4234
4235 /* Check what kind of PLT it is. */
4236 plt_type = plt_unknown;
4237 if (plts[j].type == plt_unknown
4238 && (plt->size >= (lazy_plt->plt0_entry_size
4239 + lazy_plt->plt_entry_size)))
4240 {
4241 /* Match lazy PLT first. */
4242 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4243 lazy_plt->plt0_got1_offset) == 0)
4244 {
4245 /* The fist entry in the lazy IBT PLT is the same as the
4246 normal lazy PLT. */
4247 if (lazy_ibt_plt != NULL
4248 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4249 lazy_ibt_plt->plt_entry,
4250 lazy_ibt_plt->plt_got_offset) == 0))
4251 plt_type = plt_lazy | plt_second;
4252 else
4253 plt_type = plt_lazy;
4254 }
4255 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4256 lazy_plt->plt0_got1_offset) == 0)
4257 {
4258 /* The fist entry in the PIC lazy IBT PLT is the same as
4259 the normal PIC lazy PLT. */
4260 if (lazy_ibt_plt != NULL
4261 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4262 lazy_ibt_plt->pic_plt_entry,
4263 lazy_ibt_plt->plt_got_offset) == 0))
4264 plt_type = plt_lazy | plt_pic | plt_second;
4265 else
4266 plt_type = plt_lazy | plt_pic;
4267 }
4268 }
4269
4270 if (non_lazy_plt != NULL
4271 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4272 && plt->size >= non_lazy_plt->plt_entry_size)
4273 {
4274 /* Match non-lazy PLT. */
4275 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4276 non_lazy_plt->plt_got_offset) == 0)
4277 plt_type = plt_non_lazy;
4278 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4279 non_lazy_plt->plt_got_offset) == 0)
4280 plt_type = plt_pic;
4281 }
4282
4283 if ((non_lazy_ibt_plt != NULL)
4284 && (plt_type == plt_unknown || plt_type == plt_second)
4285 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4286 {
4287 if (memcmp (plt_contents,
4288 non_lazy_ibt_plt->plt_entry,
4289 non_lazy_ibt_plt->plt_got_offset) == 0)
4290 {
4291 /* Match IBT PLT. */
4292 plt_type = plt_second;
4293 non_lazy_plt = non_lazy_ibt_plt;
4294 }
4295 else if (memcmp (plt_contents,
4296 non_lazy_ibt_plt->pic_plt_entry,
4297 non_lazy_ibt_plt->plt_got_offset) == 0)
4298 {
4299 /* Match PIC IBT PLT. */
4300 plt_type = plt_second | plt_pic;
4301 non_lazy_plt = non_lazy_ibt_plt;
4302 }
4303 }
4304
4305 if (plt_type == plt_unknown)
4306 {
4307 free (plt_contents);
4308 continue;
4309 }
4310
4311 plts[j].sec = plt;
4312 plts[j].type = plt_type;
4313
4314 if ((plt_type & plt_lazy))
4315 {
4316 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4317 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4318 /* Skip PLT0 in lazy PLT. */
4319 i = 1;
4320 }
4321 else
4322 {
4323 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4324 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4325 i = 0;
4326 }
4327
4328 /* Skip lazy PLT when the second PLT is used. */
4329 if ((plt_type & (plt_lazy | plt_second))
4330 == (plt_lazy | plt_second))
4331 plts[j].count = 0;
4332 else
4333 {
4334 n = plt->size / plts[j].plt_entry_size;
4335 plts[j].count = n;
4336 count += n - i;
4337 }
4338
4339 plts[j].contents = plt_contents;
4340
4341 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4342 if ((plt_type & plt_pic))
4343 got_addr = (bfd_vma) -1;
4344 }
4345
4346 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4347 got_addr, plts, dynsyms,
4348 ret);
4349 }
4350
4351 /* Set up i386 GNU properties. Return the first relocatable ELF input
4352 with GNU properties if found. Otherwise, return NULL. */
4353
4354 static bfd *
4355 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4356 {
4357 struct elf_x86_init_table init_table;
4358
4359 switch (get_elf_backend_data (info->output_bfd)->target_os)
4360 {
4361 case is_normal:
4362 case is_solaris:
4363 init_table.plt0_pad_byte = 0x0;
4364 init_table.lazy_plt = &elf_i386_lazy_plt;
4365 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4366 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4367 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4368 break;
4369 case is_vxworks:
4370 init_table.plt0_pad_byte = 0x90;
4371 init_table.lazy_plt = &elf_i386_lazy_plt;
4372 init_table.non_lazy_plt = NULL;
4373 init_table.lazy_ibt_plt = NULL;
4374 init_table.non_lazy_ibt_plt = NULL;
4375 break;
4376 default:
4377 abort ();
4378 }
4379
4380 init_table.r_info = elf32_r_info;
4381 init_table.r_sym = elf32_r_sym;
4382
4383 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4384 }
4385
4386 #define TARGET_LITTLE_SYM i386_elf32_vec
4387 #define TARGET_LITTLE_NAME "elf32-i386"
4388 #define ELF_ARCH bfd_arch_i386
4389 #define ELF_TARGET_ID I386_ELF_DATA
4390 #define ELF_MACHINE_CODE EM_386
4391 #define ELF_MAXPAGESIZE 0x1000
4392
4393 #define elf_backend_can_gc_sections 1
4394 #define elf_backend_can_refcount 1
4395 #define elf_backend_want_got_plt 1
4396 #define elf_backend_plt_readonly 1
4397 #define elf_backend_want_plt_sym 0
4398 #define elf_backend_got_header_size 12
4399 #define elf_backend_plt_alignment 4
4400 #define elf_backend_dtrel_excludes_plt 1
4401 #define elf_backend_extern_protected_data 1
4402 #define elf_backend_caches_rawsize 1
4403 #define elf_backend_want_dynrelro 1
4404
4405 /* Support RELA for objdump of prelink objects. */
4406 #define elf_info_to_howto elf_i386_info_to_howto_rel
4407 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4408
4409 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4410 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4411 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4412 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4413
4414 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4415 #define elf_backend_check_relocs elf_i386_check_relocs
4416 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4417 #define elf_backend_fake_sections elf_i386_fake_sections
4418 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4419 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4420 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4421 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4422 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4423 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4424 #define elf_backend_relocate_section elf_i386_relocate_section
4425 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4426 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4427
4428 #define elf_backend_linux_prpsinfo32_ugid16 true
4429
4430 #define elf32_bed elf32_i386_bed
4431
4432 #include "elf32-target.h"
4433
4434 /* FreeBSD support. */
4435
4436 #undef TARGET_LITTLE_SYM
4437 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4438 #undef TARGET_LITTLE_NAME
4439 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4440 #undef ELF_OSABI
4441 #define ELF_OSABI ELFOSABI_FREEBSD
4442
4443 /* The kernel recognizes executables as valid only if they carry a
4444 "FreeBSD" label in the ELF header. So we put this label on all
4445 executables and (for simplicity) also all other object files. */
4446
4447 static bool
4448 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4449 {
4450 if (!_bfd_elf_init_file_header (abfd, info))
4451 return false;
4452
4453 #ifdef OLD_FREEBSD_ABI_LABEL
4454 {
4455 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4456 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4457 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4458 }
4459 #endif
4460 return true;
4461 }
4462
4463 #undef elf_backend_init_file_header
4464 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4465 #undef elf32_bed
4466 #define elf32_bed elf32_i386_fbsd_bed
4467
4468 #undef elf_backend_add_symbol_hook
4469
4470 #include "elf32-target.h"
4471
4472 #undef elf_backend_init_file_header
4473
4474 /* Solaris 2. */
4475
4476 #undef TARGET_LITTLE_SYM
4477 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4478 #undef TARGET_LITTLE_NAME
4479 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4480
4481 #undef ELF_TARGET_OS
4482 #define ELF_TARGET_OS is_solaris
4483
4484 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4485 objects won't be recognized. */
4486 #undef ELF_OSABI
4487
4488 #undef elf32_bed
4489 #define elf32_bed elf32_i386_sol2_bed
4490
4491 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4492 boundary. */
4493 #undef elf_backend_static_tls_alignment
4494 #define elf_backend_static_tls_alignment 8
4495
4496 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4497
4498 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4499 File, p.63. */
4500 #undef elf_backend_want_plt_sym
4501 #define elf_backend_want_plt_sym 1
4502
4503 #undef elf_backend_strtab_flags
4504 #define elf_backend_strtab_flags SHF_STRINGS
4505
4506 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4507 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4508 FALSE otherwise. ISECTION is the best guess matching section from the
4509 input bfd IBFD, but it might be NULL. */
4510
4511 static bool
4512 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4513 bfd *obfd ATTRIBUTE_UNUSED,
4514 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4515 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4516 {
4517 /* PR 19938: FIXME: Need to add code for setting the sh_info
4518 and sh_link fields of Solaris specific section types. */
4519 return false;
4520
4521 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4522 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4523
4524 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4525
4526 The following values should be set:
4527
4528 Type Link Info
4529 -----------------------------------------------------------------------------
4530 SHT_SUNW_ancillary The section header index of 0
4531 [0x6fffffee] the associated string table.
4532
4533 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4534 [0x6ffffff0] the associated symbol table. section header index of
4535 the associated
4536 SHT_SUNW_capchain table,
4537 otherwise 0.
4538
4539 SHT_SUNW_symsort The section header index of 0
4540 [0x6ffffff1] the associated symbol table.
4541
4542 SHT_SUNW_tlssort The section header index of 0
4543 [0x6ffffff2] the associated symbol table.
4544
4545 SHT_SUNW_LDYNSYM The section header index of One greater than the
4546 [0x6ffffff3] the associated string table. symbol table index of the
4547 This index is the same string last local symbol,
4548 table used by the SHT_DYNSYM STB_LOCAL. Since
4549 section. SHT_SUNW_LDYNSYM only
4550 contains local symbols,
4551 sh_info is equivalent to
4552 the number of symbols in
4553 the table.
4554
4555 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4556 [0x6ffffff5] the section header index of to named strings, the
4557 the associated section header index of
4558 SHT_SUNW_capinfo table, the associated string
4559 otherwise 0. table, otherwise 0.
4560
4561 SHT_SUNW_move The section header index of 0
4562 [0x6ffffffa] the associated symbol table.
4563
4564 SHT_SUNW_COMDAT 0 0
4565 [0x6ffffffb]
4566
4567 SHT_SUNW_syminfo The section header index of The section header index
4568 [0x6ffffffc] the associated symbol table. of the associated
4569 .dynamic section.
4570
4571 SHT_SUNW_verdef The section header index of The number of version
4572 [0x6ffffffd] the associated string table. definitions within the
4573 section.
4574
4575 SHT_SUNW_verneed The section header index of The number of version
4576 [0x6ffffffe] the associated string table. dependencies within the
4577 section.
4578
4579 SHT_SUNW_versym The section header index of 0
4580 [0x6fffffff] the associated symbol table. */
4581 }
4582
4583 #undef elf_backend_copy_special_section_fields
4584 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4585
4586 #include "elf32-target.h"
4587
4588 /* Intel MCU support. */
4589
4590 static bool
4591 elf32_iamcu_elf_object_p (bfd *abfd)
4592 {
4593 /* Set the right machine number for an IAMCU elf32 file. */
4594 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4595 return true;
4596 }
4597
4598 #undef TARGET_LITTLE_SYM
4599 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4600 #undef TARGET_LITTLE_NAME
4601 #define TARGET_LITTLE_NAME "elf32-iamcu"
4602 #undef ELF_ARCH
4603 #define ELF_ARCH bfd_arch_iamcu
4604
4605 #undef ELF_MACHINE_CODE
4606 #define ELF_MACHINE_CODE EM_IAMCU
4607
4608 #undef ELF_TARGET_OS
4609 #undef ELF_OSABI
4610
4611 #undef elf32_bed
4612 #define elf32_bed elf32_iamcu_bed
4613
4614 #undef elf_backend_object_p
4615 #define elf_backend_object_p elf32_iamcu_elf_object_p
4616
4617 #undef elf_backend_static_tls_alignment
4618
4619 #undef elf_backend_want_plt_sym
4620 #define elf_backend_want_plt_sym 0
4621
4622 #undef elf_backend_strtab_flags
4623 #undef elf_backend_copy_special_section_fields
4624
4625 #include "elf32-target.h"
4626
4627 /* Restore defaults. */
4628 #undef ELF_ARCH
4629 #define ELF_ARCH bfd_arch_i386
4630 #undef ELF_MACHINE_CODE
4631 #define ELF_MACHINE_CODE EM_386
4632 #undef elf_backend_object_p
4633
4634 /* VxWorks support. */
4635
4636 #undef TARGET_LITTLE_SYM
4637 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4638 #undef TARGET_LITTLE_NAME
4639 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4640 #undef ELF_OSABI
4641 #undef ELF_MAXPAGESIZE
4642 #define ELF_MAXPAGESIZE 0x1000
4643 #undef elf_backend_plt_alignment
4644 #define elf_backend_plt_alignment 4
4645
4646 #undef ELF_TARGET_OS
4647 #define ELF_TARGET_OS is_vxworks
4648
4649 #undef elf_backend_relocs_compatible
4650 #undef elf_backend_add_symbol_hook
4651 #define elf_backend_add_symbol_hook \
4652 elf_vxworks_add_symbol_hook
4653 #undef elf_backend_link_output_symbol_hook
4654 #define elf_backend_link_output_symbol_hook \
4655 elf_vxworks_link_output_symbol_hook
4656 #undef elf_backend_emit_relocs
4657 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4658 #undef elf_backend_final_write_processing
4659 #define elf_backend_final_write_processing \
4660 elf_vxworks_final_write_processing
4661 #undef elf_backend_static_tls_alignment
4662
4663 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4664 define it. */
4665 #undef elf_backend_want_plt_sym
4666 #define elf_backend_want_plt_sym 1
4667
4668 #undef elf32_bed
4669 #define elf32_bed elf32_i386_vxworks_bed
4670
4671 #include "elf32-target.h"