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[thirdparty/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2021 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "elfxx-x86.h"
22 #include "elf-vxworks.h"
23 #include "dwarf2.h"
24 #include "opcode/i386.h"
25
26 /* 386 uses REL relocations instead of RELA. */
27 #define USE_REL 1
28
29 #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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_bitfield,
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_unsigned,
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_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 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_bitfield,
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_bitfield,
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_bitfield,
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 bfd_boolean
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 bfd_boolean
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 bfd_boolean
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 bfd_boolean
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 bfd_boolean
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 bfd_boolean 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 bfd_boolean
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 bfd_boolean from_relocate_section)
1067 {
1068 unsigned int from_type = *r_type;
1069 unsigned int to_type = from_type;
1070 bfd_boolean 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 bfd_boolean
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 bfd_boolean *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 bfd_boolean baseless;
1214 Elf_Internal_Sym *isym;
1215 unsigned int addend;
1216 unsigned int nop;
1217 bfd_vma nop_offset;
1218 bfd_boolean is_pic;
1219 bfd_boolean to_reloc_32;
1220 bfd_boolean abs_symbol;
1221 unsigned int r_type;
1222 unsigned int r_symndx;
1223 bfd_vma roff = irel->r_offset;
1224 bfd_boolean 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 convert_load:
1397 if (opcode == 0x8b)
1398 {
1399 if (abs_symbol && local_ref)
1400 to_reloc_32 = TRUE;
1401
1402 if (to_reloc_32)
1403 {
1404 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1405 "mov $foo, %reg2" with R_386_32. */
1406 r_type = R_386_32;
1407 modrm = 0xc0 | (modrm & 0x38) >> 3;
1408 bfd_put_8 (abfd, modrm, contents + roff - 1);
1409 opcode = 0xc7;
1410 }
1411 else
1412 {
1413 /* Convert "mov foo@GOT(%reg1), %reg2" to
1414 "lea foo@GOTOFF(%reg1), %reg2". */
1415 r_type = R_386_GOTOFF;
1416 opcode = 0x8d;
1417 }
1418 }
1419 else
1420 {
1421 /* Only R_386_32 is supported. */
1422 if (!to_reloc_32)
1423 return TRUE;
1424
1425 if (opcode == 0x85)
1426 {
1427 /* Convert "test %reg1, foo@GOT(%reg2)" to
1428 "test $foo, %reg1". */
1429 modrm = 0xc0 | (modrm & 0x38) >> 3;
1430 opcode = 0xf7;
1431 }
1432 else
1433 {
1434 /* Convert "binop foo@GOT(%reg1), %reg2" to
1435 "binop $foo, %reg2". */
1436 modrm = (0xc0
1437 | (modrm & 0x38) >> 3
1438 | (opcode & 0x3c));
1439 opcode = 0x81;
1440 }
1441 bfd_put_8 (abfd, modrm, contents + roff - 1);
1442 r_type = R_386_32;
1443 }
1444
1445 bfd_put_8 (abfd, opcode, contents + roff - 2);
1446 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1447 *r_type_p = r_type;
1448 *converted = TRUE;
1449 }
1450 }
1451
1452 return TRUE;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define check_relocs_failed sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bfd_boolean
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_x86_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_byte *contents;
1476 bfd_boolean converted;
1477
1478 if (bfd_link_relocatable (info))
1479 return TRUE;
1480
1481 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1482 if (htab == NULL)
1483 {
1484 sec->check_relocs_failed = 1;
1485 return FALSE;
1486 }
1487
1488 BFD_ASSERT (is_x86_elf (abfd, htab));
1489
1490 /* Get the section contents. */
1491 if (elf_section_data (sec)->this_hdr.contents != NULL)
1492 contents = elf_section_data (sec)->this_hdr.contents;
1493 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1494 {
1495 sec->check_relocs_failed = 1;
1496 return FALSE;
1497 }
1498
1499 symtab_hdr = &elf_symtab_hdr (abfd);
1500 sym_hashes = elf_sym_hashes (abfd);
1501
1502 converted = FALSE;
1503
1504 sreloc = NULL;
1505
1506 rel_end = relocs + sec->reloc_count;
1507 for (rel = relocs; rel < rel_end; rel++)
1508 {
1509 unsigned int r_type;
1510 unsigned int r_symndx;
1511 struct elf_link_hash_entry *h;
1512 struct elf_x86_link_hash_entry *eh;
1513 Elf_Internal_Sym *isym;
1514 const char *name;
1515 bfd_boolean size_reloc;
1516 bfd_boolean no_dynreloc;
1517
1518 r_symndx = ELF32_R_SYM (rel->r_info);
1519 r_type = ELF32_R_TYPE (rel->r_info);
1520
1521 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1522 {
1523 /* xgettext:c-format */
1524 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1525 abfd, r_symndx);
1526 goto error_return;
1527 }
1528
1529 if (r_symndx < symtab_hdr->sh_info)
1530 {
1531 /* A local symbol. */
1532 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1533 abfd, r_symndx);
1534 if (isym == NULL)
1535 goto error_return;
1536
1537 /* Check relocation against local STT_GNU_IFUNC symbol. */
1538 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1539 {
1540 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1541 if (h == NULL)
1542 goto error_return;
1543
1544 /* Fake a STT_GNU_IFUNC symbol. */
1545 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1546 isym, NULL);
1547 h->type = STT_GNU_IFUNC;
1548 h->def_regular = 1;
1549 h->ref_regular = 1;
1550 h->forced_local = 1;
1551 h->root.type = bfd_link_hash_defined;
1552 }
1553 else
1554 h = NULL;
1555 }
1556 else
1557 {
1558 isym = NULL;
1559 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1560 while (h->root.type == bfd_link_hash_indirect
1561 || h->root.type == bfd_link_hash_warning)
1562 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1563 }
1564
1565 eh = (struct elf_x86_link_hash_entry *) h;
1566 if (h != NULL)
1567 {
1568 if (r_type == R_386_GOTOFF)
1569 eh->gotoff_ref = 1;
1570
1571 /* It is referenced by a non-shared object. */
1572 h->ref_regular = 1;
1573 }
1574
1575 if (r_type == R_386_GOT32X
1576 && (h == NULL || h->type != STT_GNU_IFUNC))
1577 {
1578 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1579 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1580 &r_type, irel, h,
1581 &converted, info))
1582 goto error_return;
1583 }
1584
1585 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1586 symtab_hdr, &no_dynreloc))
1587 return FALSE;
1588
1589 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1590 symtab_hdr, sym_hashes,
1591 &r_type, GOT_UNKNOWN,
1592 rel, rel_end, h, r_symndx, FALSE))
1593 goto error_return;
1594
1595 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1596 if (h == htab->elf.hgot)
1597 htab->got_referenced = TRUE;
1598
1599 switch (r_type)
1600 {
1601 case R_386_TLS_LDM:
1602 htab->tls_ld_or_ldm_got.refcount = 1;
1603 goto create_got;
1604
1605 case R_386_PLT32:
1606 /* This symbol requires a procedure linkage table entry. We
1607 actually build the entry in adjust_dynamic_symbol,
1608 because this might be a case of linking PIC code which is
1609 never referenced by a dynamic object, in which case we
1610 don't need to generate a procedure linkage table entry
1611 after all. */
1612
1613 /* If this is a local symbol, we resolve it directly without
1614 creating a procedure linkage table entry. */
1615 if (h == NULL)
1616 continue;
1617
1618 eh->zero_undefweak &= 0x2;
1619 h->needs_plt = 1;
1620 h->plt.refcount = 1;
1621 break;
1622
1623 case R_386_SIZE32:
1624 size_reloc = TRUE;
1625 goto do_size;
1626
1627 case R_386_TLS_IE_32:
1628 case R_386_TLS_IE:
1629 case R_386_TLS_GOTIE:
1630 if (!bfd_link_executable (info))
1631 info->flags |= DF_STATIC_TLS;
1632 /* Fall through */
1633
1634 case R_386_GOT32:
1635 case R_386_GOT32X:
1636 case R_386_TLS_GD:
1637 case R_386_TLS_GOTDESC:
1638 case R_386_TLS_DESC_CALL:
1639 /* This symbol requires a global offset table entry. */
1640 {
1641 int tls_type, old_tls_type;
1642
1643 switch (r_type)
1644 {
1645 default:
1646 case R_386_GOT32:
1647 case R_386_GOT32X:
1648 tls_type = GOT_NORMAL;
1649 break;
1650 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 tls_type = GOT_TLS_GDESC; break;
1654 case R_386_TLS_IE_32:
1655 if (ELF32_R_TYPE (rel->r_info) == r_type)
1656 tls_type = GOT_TLS_IE_NEG;
1657 else
1658 /* If this is a GD->IE transition, we may use either of
1659 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1660 tls_type = GOT_TLS_IE;
1661 break;
1662 case R_386_TLS_IE:
1663 case R_386_TLS_GOTIE:
1664 tls_type = GOT_TLS_IE_POS; break;
1665 }
1666
1667 if (h != NULL)
1668 {
1669 h->got.refcount = 1;
1670 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1671 }
1672 else
1673 {
1674 bfd_signed_vma *local_got_refcounts;
1675
1676 /* This is a global offset table entry for a local symbol. */
1677 local_got_refcounts = elf_local_got_refcounts (abfd);
1678 if (local_got_refcounts == NULL)
1679 {
1680 bfd_size_type size;
1681
1682 size = symtab_hdr->sh_info;
1683 size *= (sizeof (bfd_signed_vma)
1684 + sizeof (bfd_vma) + sizeof(char));
1685 local_got_refcounts = (bfd_signed_vma *)
1686 bfd_zalloc (abfd, size);
1687 if (local_got_refcounts == NULL)
1688 goto error_return;
1689 elf_local_got_refcounts (abfd) = local_got_refcounts;
1690 elf_x86_local_tlsdesc_gotent (abfd)
1691 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1692 elf_x86_local_got_tls_type (abfd)
1693 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1694 }
1695 local_got_refcounts[r_symndx] = 1;
1696 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1697 }
1698
1699 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1700 tls_type |= old_tls_type;
1701 /* If a TLS symbol is accessed using IE at least once,
1702 there is no point to use dynamic model for it. */
1703 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1704 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1705 || (tls_type & GOT_TLS_IE) == 0))
1706 {
1707 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1708 tls_type = old_tls_type;
1709 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1710 && GOT_TLS_GD_ANY_P (tls_type))
1711 tls_type |= old_tls_type;
1712 else
1713 {
1714 if (h)
1715 name = h->root.root.string;
1716 else
1717 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1718 NULL);
1719 _bfd_error_handler
1720 /* xgettext:c-format */
1721 (_("%pB: `%s' accessed both as normal and "
1722 "thread local symbol"),
1723 abfd, name);
1724 bfd_set_error (bfd_error_bad_value);
1725 goto error_return;
1726 }
1727 }
1728
1729 if (old_tls_type != tls_type)
1730 {
1731 if (h != NULL)
1732 elf_x86_hash_entry (h)->tls_type = tls_type;
1733 else
1734 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1735 }
1736 }
1737 /* Fall through */
1738
1739 case R_386_GOTOFF:
1740 case R_386_GOTPC:
1741 create_got:
1742 if (r_type != R_386_TLS_IE)
1743 {
1744 if (eh != NULL)
1745 {
1746 eh->zero_undefweak &= 0x2;
1747
1748 /* Need GOT to resolve undefined weak symbol to 0. */
1749 if (r_type == R_386_GOTOFF
1750 && h->root.type == bfd_link_hash_undefweak
1751 && bfd_link_executable (info))
1752 htab->got_referenced = TRUE;
1753 }
1754 break;
1755 }
1756 /* Fall through */
1757
1758 case R_386_TLS_LE_32:
1759 case R_386_TLS_LE:
1760 if (eh != NULL)
1761 eh->zero_undefweak &= 0x2;
1762 if (bfd_link_executable (info))
1763 break;
1764 info->flags |= DF_STATIC_TLS;
1765 goto do_relocation;
1766
1767 case R_386_32:
1768 case R_386_PC32:
1769 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1770 eh->zero_undefweak |= 0x2;
1771 do_relocation:
1772 /* We are called after all symbols have been resolved. Only
1773 relocation against STT_GNU_IFUNC symbol must go through
1774 PLT. */
1775 if (h != NULL
1776 && (bfd_link_executable (info)
1777 || h->type == STT_GNU_IFUNC))
1778 {
1779 bfd_boolean func_pointer_ref = FALSE;
1780
1781 if (r_type == R_386_PC32)
1782 {
1783 /* Since something like ".long foo - ." may be used
1784 as pointer, make sure that PLT is used if foo is
1785 a function defined in a shared library. */
1786 if ((sec->flags & SEC_CODE) == 0)
1787 h->pointer_equality_needed = 1;
1788 else if (h->type == STT_GNU_IFUNC
1789 && bfd_link_pic (info))
1790 {
1791 _bfd_error_handler
1792 /* xgettext:c-format */
1793 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1794 abfd, h->root.root.string);
1795 bfd_set_error (bfd_error_bad_value);
1796 goto error_return;
1797 }
1798 }
1799 else
1800 {
1801 h->pointer_equality_needed = 1;
1802 /* R_386_32 can be resolved at run-time. */
1803 if (r_type == R_386_32
1804 && (sec->flags & SEC_READONLY) == 0)
1805 func_pointer_ref = TRUE;
1806 }
1807
1808 if (!func_pointer_ref)
1809 {
1810 /* If this reloc is in a read-only section, we might
1811 need a copy reloc. We can't check reliably at this
1812 stage whether the section is read-only, as input
1813 sections have not yet been mapped to output sections.
1814 Tentatively set the flag for now, and correct in
1815 adjust_dynamic_symbol. */
1816 h->non_got_ref = 1;
1817
1818 /* We may need a .plt entry if the symbol is a function
1819 defined in a shared lib or is a function referenced
1820 from the code or read-only section. */
1821 if (!h->def_regular
1822 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1823 h->plt.refcount = 1;
1824 }
1825 }
1826
1827 size_reloc = FALSE;
1828 do_size:
1829 if (!no_dynreloc
1830 && NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1831 R_386_32))
1832 {
1833 struct elf_dyn_relocs *p;
1834 struct elf_dyn_relocs **head;
1835
1836 /* We must copy these reloc types into the output file.
1837 Create a reloc section in dynobj and make room for
1838 this reloc. */
1839 if (sreloc == NULL)
1840 {
1841 sreloc = _bfd_elf_make_dynamic_reloc_section
1842 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1843
1844 if (sreloc == NULL)
1845 goto error_return;
1846 }
1847
1848 /* If this is a global symbol, we count the number of
1849 relocations we need for this symbol. */
1850 if (h != NULL)
1851 {
1852 head = &h->dyn_relocs;
1853 }
1854 else
1855 {
1856 /* Track dynamic relocs needed for local syms too.
1857 We really need local syms available to do this
1858 easily. Oh well. */
1859 void **vpp;
1860 asection *s;
1861
1862 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1863 abfd, r_symndx);
1864 if (isym == NULL)
1865 goto error_return;
1866
1867 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1868 if (s == NULL)
1869 s = sec;
1870
1871 vpp = &elf_section_data (s)->local_dynrel;
1872 head = (struct elf_dyn_relocs **)vpp;
1873 }
1874
1875 p = *head;
1876 if (p == NULL || p->sec != sec)
1877 {
1878 size_t amt = sizeof *p;
1879 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1880 amt);
1881 if (p == NULL)
1882 goto error_return;
1883 p->next = *head;
1884 *head = p;
1885 p->sec = sec;
1886 p->count = 0;
1887 p->pc_count = 0;
1888 }
1889
1890 p->count += 1;
1891 /* Count size relocation as PC-relative relocation. */
1892 if (r_type == R_386_PC32 || size_reloc)
1893 p->pc_count += 1;
1894 }
1895 break;
1896
1897 /* This relocation describes the C++ object vtable hierarchy.
1898 Reconstruct it for later use during GC. */
1899 case R_386_GNU_VTINHERIT:
1900 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1901 goto error_return;
1902 break;
1903
1904 /* This relocation describes which C++ vtable entries are actually
1905 used. Record for later use during GC. */
1906 case R_386_GNU_VTENTRY:
1907 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1908 goto error_return;
1909 break;
1910
1911 default:
1912 break;
1913 }
1914 }
1915
1916 if (elf_section_data (sec)->this_hdr.contents != contents)
1917 {
1918 if (!converted && !info->keep_memory)
1919 free (contents);
1920 else
1921 {
1922 /* Cache the section contents for elf_link_input_bfd if any
1923 load is converted or --no-keep-memory isn't used. */
1924 elf_section_data (sec)->this_hdr.contents = contents;
1925 }
1926 }
1927
1928 /* Cache relocations if any load is converted. */
1929 if (elf_section_data (sec)->relocs != relocs && converted)
1930 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1931
1932 return TRUE;
1933
1934 error_return:
1935 if (elf_section_data (sec)->this_hdr.contents != contents)
1936 free (contents);
1937 sec->check_relocs_failed = 1;
1938 return FALSE;
1939 }
1940
1941 /* Set the correct type for an x86 ELF section. We do this by the
1942 section name, which is a hack, but ought to work. */
1943
1944 static bfd_boolean
1945 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1946 Elf_Internal_Shdr *hdr,
1947 asection *sec)
1948 {
1949 const char *name;
1950
1951 name = bfd_section_name (sec);
1952
1953 /* This is an ugly, but unfortunately necessary hack that is
1954 needed when producing EFI binaries on x86. It tells
1955 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1956 containing ELF relocation info. We need this hack in order to
1957 be able to generate ELF binaries that can be translated into
1958 EFI applications (which are essentially COFF objects). Those
1959 files contain a COFF ".reloc" section inside an ELFNN object,
1960 which would normally cause BFD to segfault because it would
1961 attempt to interpret this section as containing relocation
1962 entries for section "oc". With this hack enabled, ".reloc"
1963 will be treated as a normal data section, which will avoid the
1964 segfault. However, you won't be able to create an ELFNN binary
1965 with a section named "oc" that needs relocations, but that's
1966 the kind of ugly side-effects you get when detecting section
1967 types based on their names... In practice, this limitation is
1968 unlikely to bite. */
1969 if (strcmp (name, ".reloc") == 0)
1970 hdr->sh_type = SHT_PROGBITS;
1971
1972 return TRUE;
1973 }
1974
1975 /* Return the relocation value for @tpoff relocation
1976 if STT_TLS virtual address is ADDRESS. */
1977
1978 static bfd_vma
1979 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1980 {
1981 struct elf_link_hash_table *htab = elf_hash_table (info);
1982 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1983 bfd_vma static_tls_size;
1984
1985 /* If tls_sec is NULL, we should have signalled an error already. */
1986 if (htab->tls_sec == NULL)
1987 return 0;
1988
1989 /* Consider special static TLS alignment requirements. */
1990 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1991 return static_tls_size + htab->tls_sec->vma - address;
1992 }
1993
1994 /* Relocate an i386 ELF section. */
1995
1996 static bfd_boolean
1997 elf_i386_relocate_section (bfd *output_bfd,
1998 struct bfd_link_info *info,
1999 bfd *input_bfd,
2000 asection *input_section,
2001 bfd_byte *contents,
2002 Elf_Internal_Rela *relocs,
2003 Elf_Internal_Sym *local_syms,
2004 asection **local_sections)
2005 {
2006 struct elf_x86_link_hash_table *htab;
2007 Elf_Internal_Shdr *symtab_hdr;
2008 struct elf_link_hash_entry **sym_hashes;
2009 bfd_vma *local_got_offsets;
2010 bfd_vma *local_tlsdesc_gotents;
2011 Elf_Internal_Rela *rel;
2012 Elf_Internal_Rela *wrel;
2013 Elf_Internal_Rela *relend;
2014 bfd_boolean is_vxworks_tls;
2015 unsigned plt_entry_size;
2016
2017 /* Skip if check_relocs failed. */
2018 if (input_section->check_relocs_failed)
2019 return FALSE;
2020
2021 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2022 if (htab == NULL)
2023 return FALSE;
2024
2025 if (!is_x86_elf (input_bfd, htab))
2026 {
2027 bfd_set_error (bfd_error_wrong_format);
2028 return FALSE;
2029 }
2030
2031 symtab_hdr = &elf_symtab_hdr (input_bfd);
2032 sym_hashes = elf_sym_hashes (input_bfd);
2033 local_got_offsets = elf_local_got_offsets (input_bfd);
2034 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2035 /* We have to handle relocations in vxworks .tls_vars sections
2036 specially, because the dynamic loader is 'weird'. */
2037 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2038 && bfd_link_pic (info)
2039 && !strcmp (input_section->output_section->name,
2040 ".tls_vars"));
2041
2042 _bfd_x86_elf_set_tls_module_base (info);
2043
2044 plt_entry_size = htab->plt.plt_entry_size;
2045
2046 rel = wrel = relocs;
2047 relend = relocs + input_section->reloc_count;
2048 for (; rel < relend; wrel++, rel++)
2049 {
2050 unsigned int r_type, r_type_tls;
2051 reloc_howto_type *howto;
2052 unsigned long r_symndx;
2053 struct elf_link_hash_entry *h;
2054 struct elf_x86_link_hash_entry *eh;
2055 Elf_Internal_Sym *sym;
2056 asection *sec;
2057 bfd_vma off, offplt, plt_offset;
2058 bfd_vma relocation;
2059 bfd_boolean unresolved_reloc;
2060 bfd_reloc_status_type r;
2061 unsigned int indx;
2062 int tls_type;
2063 bfd_vma st_size;
2064 asection *resolved_plt;
2065 bfd_boolean resolved_to_zero;
2066 bfd_boolean relative_reloc;
2067
2068 r_type = ELF32_R_TYPE (rel->r_info);
2069 if (r_type == R_386_GNU_VTINHERIT
2070 || r_type == R_386_GNU_VTENTRY)
2071 {
2072 if (wrel != rel)
2073 *wrel = *rel;
2074 continue;
2075 }
2076
2077 howto = elf_i386_rtype_to_howto (r_type);
2078 if (howto == NULL)
2079 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2080
2081 r_symndx = ELF32_R_SYM (rel->r_info);
2082 h = NULL;
2083 sym = NULL;
2084 sec = NULL;
2085 unresolved_reloc = FALSE;
2086 if (r_symndx < symtab_hdr->sh_info)
2087 {
2088 sym = local_syms + r_symndx;
2089 sec = local_sections[r_symndx];
2090 relocation = (sec->output_section->vma
2091 + sec->output_offset
2092 + sym->st_value);
2093 st_size = sym->st_size;
2094
2095 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2096 && ((sec->flags & SEC_MERGE) != 0
2097 || (bfd_link_relocatable (info)
2098 && sec->output_offset != 0)))
2099 {
2100 bfd_vma addend;
2101 bfd_byte *where = contents + rel->r_offset;
2102
2103 switch (howto->size)
2104 {
2105 case 0:
2106 addend = bfd_get_8 (input_bfd, where);
2107 if (howto->pc_relative)
2108 {
2109 addend = (addend ^ 0x80) - 0x80;
2110 addend += 1;
2111 }
2112 break;
2113 case 1:
2114 addend = bfd_get_16 (input_bfd, where);
2115 if (howto->pc_relative)
2116 {
2117 addend = (addend ^ 0x8000) - 0x8000;
2118 addend += 2;
2119 }
2120 break;
2121 case 2:
2122 addend = bfd_get_32 (input_bfd, where);
2123 if (howto->pc_relative)
2124 {
2125 addend = (addend ^ 0x80000000) - 0x80000000;
2126 addend += 4;
2127 }
2128 break;
2129 default:
2130 abort ();
2131 }
2132
2133 if (bfd_link_relocatable (info))
2134 addend += sec->output_offset;
2135 else
2136 {
2137 asection *msec = sec;
2138 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2139 addend);
2140 addend -= relocation;
2141 addend += msec->output_section->vma + msec->output_offset;
2142 }
2143
2144 switch (howto->size)
2145 {
2146 case 0:
2147 /* FIXME: overflow checks. */
2148 if (howto->pc_relative)
2149 addend -= 1;
2150 bfd_put_8 (input_bfd, addend, where);
2151 break;
2152 case 1:
2153 if (howto->pc_relative)
2154 addend -= 2;
2155 bfd_put_16 (input_bfd, addend, where);
2156 break;
2157 case 2:
2158 if (howto->pc_relative)
2159 addend -= 4;
2160 bfd_put_32 (input_bfd, addend, where);
2161 break;
2162 }
2163 }
2164 else if (!bfd_link_relocatable (info)
2165 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2166 {
2167 /* Relocate against local STT_GNU_IFUNC symbol. */
2168 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2169 FALSE);
2170 if (h == NULL)
2171 abort ();
2172
2173 /* Set STT_GNU_IFUNC symbol value. */
2174 h->root.u.def.value = sym->st_value;
2175 h->root.u.def.section = sec;
2176 }
2177 }
2178 else
2179 {
2180 bfd_boolean warned ATTRIBUTE_UNUSED;
2181 bfd_boolean ignored ATTRIBUTE_UNUSED;
2182
2183 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2184 r_symndx, symtab_hdr, sym_hashes,
2185 h, sec, relocation,
2186 unresolved_reloc, warned, ignored);
2187 st_size = h->size;
2188 }
2189
2190 if (sec != NULL && discarded_section (sec))
2191 {
2192 _bfd_clear_contents (howto, input_bfd, input_section,
2193 contents, rel->r_offset);
2194 wrel->r_offset = rel->r_offset;
2195 wrel->r_info = 0;
2196 wrel->r_addend = 0;
2197
2198 /* For ld -r, remove relocations in debug sections against
2199 sections defined in discarded sections. Not done for
2200 eh_frame editing code expects to be present. */
2201 if (bfd_link_relocatable (info)
2202 && (input_section->flags & SEC_DEBUGGING))
2203 wrel--;
2204
2205 continue;
2206 }
2207
2208 if (bfd_link_relocatable (info))
2209 {
2210 if (wrel != rel)
2211 *wrel = *rel;
2212 continue;
2213 }
2214
2215 eh = (struct elf_x86_link_hash_entry *) h;
2216
2217 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2218 it here if it is defined in a non-shared object. */
2219 if (h != NULL
2220 && h->type == STT_GNU_IFUNC
2221 && h->def_regular)
2222 {
2223 asection *gotplt, *base_got;
2224 bfd_vma plt_index;
2225 const char *name;
2226
2227 if ((input_section->flags & SEC_ALLOC) == 0)
2228 {
2229 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2230 STT_GNU_IFUNC symbol as STT_FUNC. */
2231 if (elf_section_type (input_section) == SHT_NOTE)
2232 goto skip_ifunc;
2233 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2234 sections because such sections are not SEC_ALLOC and
2235 thus ld.so will not process them. */
2236 if ((input_section->flags & SEC_DEBUGGING) != 0)
2237 continue;
2238 abort ();
2239 }
2240
2241 /* STT_GNU_IFUNC symbol must go through PLT. */
2242 if (htab->elf.splt != NULL)
2243 {
2244 if (htab->plt_second != NULL)
2245 {
2246 resolved_plt = htab->plt_second;
2247 plt_offset = eh->plt_second.offset;
2248 }
2249 else
2250 {
2251 resolved_plt = htab->elf.splt;
2252 plt_offset = h->plt.offset;
2253 }
2254 gotplt = htab->elf.sgotplt;
2255 }
2256 else
2257 {
2258 resolved_plt = htab->elf.iplt;
2259 plt_offset = h->plt.offset;
2260 gotplt = htab->elf.igotplt;
2261 }
2262
2263 switch (r_type)
2264 {
2265 default:
2266 break;
2267
2268 case R_386_GOT32:
2269 case R_386_GOT32X:
2270 base_got = htab->elf.sgot;
2271 off = h->got.offset;
2272
2273 if (base_got == NULL)
2274 abort ();
2275
2276 if (off == (bfd_vma) -1)
2277 {
2278 /* We can't use h->got.offset here to save state, or
2279 even just remember the offset, as finish_dynamic_symbol
2280 would use that as offset into .got. */
2281
2282 if (h->plt.offset == (bfd_vma) -1)
2283 abort ();
2284
2285 if (htab->elf.splt != NULL)
2286 {
2287 plt_index = (h->plt.offset / plt_entry_size
2288 - htab->plt.has_plt0);
2289 off = (plt_index + 3) * 4;
2290 base_got = htab->elf.sgotplt;
2291 }
2292 else
2293 {
2294 plt_index = h->plt.offset / plt_entry_size;
2295 off = plt_index * 4;
2296 base_got = htab->elf.igotplt;
2297 }
2298
2299 if (h->dynindx == -1
2300 || h->forced_local
2301 || info->symbolic)
2302 {
2303 /* This references the local defitionion. We must
2304 initialize this entry in the global offset table.
2305 Since the offset must always be a multiple of 8,
2306 we use the least significant bit to record
2307 whether we have initialized it already.
2308
2309 When doing a dynamic link, we create a .rela.got
2310 relocation entry to initialize the value. This
2311 is done in the finish_dynamic_symbol routine. */
2312 if ((off & 1) != 0)
2313 off &= ~1;
2314 else
2315 {
2316 bfd_put_32 (output_bfd, relocation,
2317 base_got->contents + off);
2318 h->got.offset |= 1;
2319 }
2320 }
2321
2322 relocation = off;
2323 }
2324 else
2325 relocation = (base_got->output_section->vma
2326 + base_got->output_offset + off
2327 - gotplt->output_section->vma
2328 - gotplt->output_offset);
2329
2330 if (rel->r_offset > 1
2331 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2332 && *(contents + rel->r_offset - 2) != 0x8d)
2333 {
2334 if (bfd_link_pic (info))
2335 goto disallow_got32;
2336
2337 /* Add the GOT base if there is no base register. */
2338 relocation += (gotplt->output_section->vma
2339 + gotplt->output_offset);
2340 }
2341 else if (htab->elf.splt == NULL)
2342 {
2343 /* Adjust for static executables. */
2344 relocation += gotplt->output_offset;
2345 }
2346
2347 goto do_relocation;
2348 }
2349
2350 if (h->plt.offset == (bfd_vma) -1)
2351 {
2352 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2353 if (r_type == R_386_32
2354 && (input_section->flags & SEC_CODE) == 0)
2355 goto do_ifunc_pointer;
2356 goto bad_ifunc_reloc;
2357 }
2358
2359 relocation = (resolved_plt->output_section->vma
2360 + resolved_plt->output_offset + plt_offset);
2361
2362 switch (r_type)
2363 {
2364 default:
2365 bad_ifunc_reloc:
2366 if (h->root.root.string)
2367 name = h->root.root.string;
2368 else
2369 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2370 NULL);
2371 _bfd_error_handler
2372 /* xgettext:c-format */
2373 (_("%pB: relocation %s against STT_GNU_IFUNC "
2374 "symbol `%s' isn't supported"), input_bfd,
2375 howto->name, name);
2376 bfd_set_error (bfd_error_bad_value);
2377 return FALSE;
2378
2379 case R_386_32:
2380 /* Generate dynamic relcoation only when there is a
2381 non-GOT reference in a shared object. */
2382 if ((bfd_link_pic (info) && h->non_got_ref)
2383 || h->plt.offset == (bfd_vma) -1)
2384 {
2385 Elf_Internal_Rela outrel;
2386 asection *sreloc;
2387 bfd_vma offset;
2388
2389 do_ifunc_pointer:
2390 /* Need a dynamic relocation to get the real function
2391 adddress. */
2392 offset = _bfd_elf_section_offset (output_bfd,
2393 info,
2394 input_section,
2395 rel->r_offset);
2396 if (offset == (bfd_vma) -1
2397 || offset == (bfd_vma) -2)
2398 abort ();
2399
2400 outrel.r_offset = (input_section->output_section->vma
2401 + input_section->output_offset
2402 + offset);
2403
2404 if (POINTER_LOCAL_IFUNC_P (info, h))
2405 {
2406 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2407 h->root.root.string,
2408 h->root.u.def.section->owner);
2409
2410 /* This symbol is resolved locally. */
2411 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2412 bfd_put_32 (output_bfd,
2413 (h->root.u.def.value
2414 + h->root.u.def.section->output_section->vma
2415 + h->root.u.def.section->output_offset),
2416 contents + offset);
2417 }
2418 else
2419 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2420
2421 /* Dynamic relocations are stored in
2422 1. .rel.ifunc section in PIC object.
2423 2. .rel.got section in dynamic executable.
2424 3. .rel.iplt section in static executable. */
2425 if (bfd_link_pic (info))
2426 sreloc = htab->elf.irelifunc;
2427 else if (htab->elf.splt != NULL)
2428 sreloc = htab->elf.srelgot;
2429 else
2430 sreloc = htab->elf.irelplt;
2431 elf_append_rel (output_bfd, sreloc, &outrel);
2432
2433 /* If this reloc is against an external symbol, we
2434 do not want to fiddle with the addend. Otherwise,
2435 we need to include the symbol value so that it
2436 becomes an addend for the dynamic reloc. For an
2437 internal symbol, we have updated addend. */
2438 continue;
2439 }
2440 /* FALLTHROUGH */
2441 case R_386_PC32:
2442 case R_386_PLT32:
2443 goto do_relocation;
2444
2445 case R_386_GOTOFF:
2446 relocation -= (gotplt->output_section->vma
2447 + gotplt->output_offset);
2448 goto do_relocation;
2449 }
2450 }
2451
2452 skip_ifunc:
2453 resolved_to_zero = (eh != NULL
2454 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2455
2456 switch (r_type)
2457 {
2458 case R_386_GOT32X:
2459 case R_386_GOT32:
2460 /* Relocation is to the entry for this symbol in the global
2461 offset table. */
2462 if (htab->elf.sgot == NULL)
2463 abort ();
2464
2465 relative_reloc = FALSE;
2466 if (h != NULL)
2467 {
2468 off = h->got.offset;
2469 if (RESOLVED_LOCALLY_P (info, h, htab))
2470 {
2471 /* We must initialize this entry in the global offset
2472 table. Since the offset must always be a multiple
2473 of 4, we use the least significant bit to record
2474 whether we have initialized it already.
2475
2476 When doing a dynamic link, we create a .rel.got
2477 relocation entry to initialize the value. This
2478 is done in the finish_dynamic_symbol routine. */
2479 if ((off & 1) != 0)
2480 off &= ~1;
2481 else
2482 {
2483 bfd_put_32 (output_bfd, relocation,
2484 htab->elf.sgot->contents + off);
2485 h->got.offset |= 1;
2486
2487 if (GENERATE_RELATIVE_RELOC_P (info, h))
2488 {
2489 /* PR ld/21402: If this symbol isn't dynamic
2490 in PIC, generate R_386_RELATIVE here. */
2491 eh->no_finish_dynamic_symbol = 1;
2492 relative_reloc = TRUE;
2493 }
2494 }
2495 }
2496 else
2497 unresolved_reloc = FALSE;
2498 }
2499 else
2500 {
2501 if (local_got_offsets == NULL)
2502 abort ();
2503
2504 off = local_got_offsets[r_symndx];
2505
2506 /* The offset must always be a multiple of 4. We use
2507 the least significant bit to record whether we have
2508 already generated the necessary reloc. */
2509 if ((off & 1) != 0)
2510 off &= ~1;
2511 else
2512 {
2513 bfd_put_32 (output_bfd, relocation,
2514 htab->elf.sgot->contents + off);
2515 local_got_offsets[r_symndx] |= 1;
2516
2517 if (bfd_link_pic (info))
2518 relative_reloc = TRUE;
2519 }
2520 }
2521
2522 if (relative_reloc)
2523 {
2524 asection *s;
2525 Elf_Internal_Rela outrel;
2526
2527 s = htab->elf.srelgot;
2528 if (s == NULL)
2529 abort ();
2530
2531 outrel.r_offset = (htab->elf.sgot->output_section->vma
2532 + htab->elf.sgot->output_offset
2533 + off);
2534 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2535 elf_append_rel (output_bfd, s, &outrel);
2536 }
2537
2538 if (off >= (bfd_vma) -2)
2539 abort ();
2540
2541 relocation = (htab->elf.sgot->output_section->vma
2542 + htab->elf.sgot->output_offset + off);
2543 if (rel->r_offset > 1
2544 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2545 && *(contents + rel->r_offset - 2) != 0x8d)
2546 {
2547 if (bfd_link_pic (info))
2548 {
2549 /* For PIC, disallow R_386_GOT32 without a base
2550 register, except for "lea foo@GOT, %reg", since
2551 we don't know what the GOT base is. */
2552 const char *name;
2553
2554 disallow_got32:
2555 if (h == NULL || h->root.root.string == NULL)
2556 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2557 NULL);
2558 else
2559 name = h->root.root.string;
2560
2561 _bfd_error_handler
2562 /* xgettext:c-format */
2563 (_("%pB: direct GOT relocation %s against `%s'"
2564 " without base register can not be used"
2565 " when making a shared object"),
2566 input_bfd, howto->name, name);
2567 bfd_set_error (bfd_error_bad_value);
2568 return FALSE;
2569 }
2570 }
2571 else
2572 {
2573 /* Subtract the .got.plt section address only with a base
2574 register. */
2575 relocation -= (htab->elf.sgotplt->output_section->vma
2576 + htab->elf.sgotplt->output_offset);
2577 }
2578
2579 break;
2580
2581 case R_386_GOTOFF:
2582 /* Relocation is relative to the start of the global offset
2583 table. */
2584
2585 /* Check to make sure it isn't a protected function or data
2586 symbol for shared library since it may not be local when
2587 used as function address or with copy relocation. We also
2588 need to make sure that a symbol is referenced locally. */
2589 if (!bfd_link_executable (info) && h)
2590 {
2591 if (!h->def_regular)
2592 {
2593 const char *v;
2594
2595 switch (ELF_ST_VISIBILITY (h->other))
2596 {
2597 case STV_HIDDEN:
2598 v = _("hidden symbol");
2599 break;
2600 case STV_INTERNAL:
2601 v = _("internal symbol");
2602 break;
2603 case STV_PROTECTED:
2604 v = _("protected symbol");
2605 break;
2606 default:
2607 v = _("symbol");
2608 break;
2609 }
2610
2611 _bfd_error_handler
2612 /* xgettext:c-format */
2613 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2614 " `%s' can not be used when making a shared object"),
2615 input_bfd, v, h->root.root.string);
2616 bfd_set_error (bfd_error_bad_value);
2617 return FALSE;
2618 }
2619 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2620 && (h->type == STT_FUNC
2621 || h->type == STT_OBJECT)
2622 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2623 {
2624 _bfd_error_handler
2625 /* xgettext:c-format */
2626 (_("%pB: relocation R_386_GOTOFF against protected %s"
2627 " `%s' can not be used when making a shared object"),
2628 input_bfd,
2629 h->type == STT_FUNC ? "function" : "data",
2630 h->root.root.string);
2631 bfd_set_error (bfd_error_bad_value);
2632 return FALSE;
2633 }
2634 }
2635
2636 /* Note that sgot is not involved in this
2637 calculation. We always want the start of .got.plt. If we
2638 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2639 permitted by the ABI, we might have to change this
2640 calculation. */
2641 relocation -= htab->elf.sgotplt->output_section->vma
2642 + htab->elf.sgotplt->output_offset;
2643 break;
2644
2645 case R_386_GOTPC:
2646 /* Use global offset table as symbol value. */
2647 relocation = htab->elf.sgotplt->output_section->vma
2648 + htab->elf.sgotplt->output_offset;
2649 unresolved_reloc = FALSE;
2650 break;
2651
2652 case R_386_PLT32:
2653 /* Relocation is to the entry for this symbol in the
2654 procedure linkage table. */
2655
2656 /* Resolve a PLT32 reloc against a local symbol directly,
2657 without using the procedure linkage table. */
2658 if (h == NULL)
2659 break;
2660
2661 if ((h->plt.offset == (bfd_vma) -1
2662 && eh->plt_got.offset == (bfd_vma) -1)
2663 || htab->elf.splt == NULL)
2664 {
2665 /* We didn't make a PLT entry for this symbol. This
2666 happens when statically linking PIC code, or when
2667 using -Bsymbolic. */
2668 break;
2669 }
2670
2671 if (h->plt.offset != (bfd_vma) -1)
2672 {
2673 if (htab->plt_second != NULL)
2674 {
2675 resolved_plt = htab->plt_second;
2676 plt_offset = eh->plt_second.offset;
2677 }
2678 else
2679 {
2680 resolved_plt = htab->elf.splt;
2681 plt_offset = h->plt.offset;
2682 }
2683 }
2684 else
2685 {
2686 resolved_plt = htab->plt_got;
2687 plt_offset = eh->plt_got.offset;
2688 }
2689
2690 relocation = (resolved_plt->output_section->vma
2691 + resolved_plt->output_offset
2692 + plt_offset);
2693 unresolved_reloc = FALSE;
2694 break;
2695
2696 case R_386_SIZE32:
2697 /* Set to symbol size. */
2698 relocation = st_size;
2699 /* Fall through. */
2700
2701 case R_386_32:
2702 case R_386_PC32:
2703 if ((input_section->flags & SEC_ALLOC) == 0
2704 || is_vxworks_tls)
2705 break;
2706
2707 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2708 FALSE, resolved_to_zero,
2709 (r_type == R_386_PC32)))
2710 {
2711 Elf_Internal_Rela outrel;
2712 bfd_boolean skip, relocate;
2713 asection *sreloc;
2714
2715 /* When generating a shared object, these relocations
2716 are copied into the output file to be resolved at run
2717 time. */
2718
2719 skip = FALSE;
2720 relocate = FALSE;
2721
2722 outrel.r_offset =
2723 _bfd_elf_section_offset (output_bfd, info, input_section,
2724 rel->r_offset);
2725 if (outrel.r_offset == (bfd_vma) -1)
2726 skip = TRUE;
2727 else if (outrel.r_offset == (bfd_vma) -2)
2728 skip = TRUE, relocate = TRUE;
2729 outrel.r_offset += (input_section->output_section->vma
2730 + input_section->output_offset);
2731
2732 if (skip)
2733 memset (&outrel, 0, sizeof outrel);
2734 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2735 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2736 else
2737 {
2738 /* This symbol is local, or marked to become local. */
2739 relocate = TRUE;
2740 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2741 }
2742
2743 sreloc = elf_section_data (input_section)->sreloc;
2744
2745 if (sreloc == NULL || sreloc->contents == NULL)
2746 {
2747 r = bfd_reloc_notsupported;
2748 goto check_relocation_error;
2749 }
2750
2751 elf_append_rel (output_bfd, sreloc, &outrel);
2752
2753 /* If this reloc is against an external symbol, we do
2754 not want to fiddle with the addend. Otherwise, we
2755 need to include the symbol value so that it becomes
2756 an addend for the dynamic reloc. */
2757 if (! relocate)
2758 continue;
2759 }
2760 break;
2761
2762 case R_386_TLS_IE:
2763 if (!bfd_link_executable (info))
2764 {
2765 Elf_Internal_Rela outrel;
2766 asection *sreloc;
2767
2768 outrel.r_offset = rel->r_offset
2769 + input_section->output_section->vma
2770 + input_section->output_offset;
2771 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2772 sreloc = elf_section_data (input_section)->sreloc;
2773 if (sreloc == NULL)
2774 abort ();
2775 elf_append_rel (output_bfd, sreloc, &outrel);
2776 }
2777 /* Fall through */
2778
2779 case R_386_TLS_GD:
2780 case R_386_TLS_GOTDESC:
2781 case R_386_TLS_DESC_CALL:
2782 case R_386_TLS_IE_32:
2783 case R_386_TLS_GOTIE:
2784 tls_type = GOT_UNKNOWN;
2785 if (h == NULL && local_got_offsets)
2786 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2787 else if (h != NULL)
2788 tls_type = elf_x86_hash_entry(h)->tls_type;
2789 if (tls_type == GOT_TLS_IE)
2790 tls_type = GOT_TLS_IE_NEG;
2791
2792 r_type_tls = r_type;
2793 if (! elf_i386_tls_transition (info, input_bfd,
2794 input_section, contents,
2795 symtab_hdr, sym_hashes,
2796 &r_type_tls, tls_type, rel,
2797 relend, h, r_symndx, TRUE))
2798 return FALSE;
2799
2800 if (r_type_tls == R_386_TLS_LE_32)
2801 {
2802 BFD_ASSERT (! unresolved_reloc);
2803 if (r_type == R_386_TLS_GD)
2804 {
2805 unsigned int type;
2806 bfd_vma roff;
2807
2808 /* GD->LE transition. */
2809 type = *(contents + rel->r_offset - 2);
2810 if (type == 0x04)
2811 {
2812 /* Change
2813 leal foo@tlsgd(,%ebx,1), %eax
2814 call ___tls_get_addr@PLT
2815 into:
2816 movl %gs:0, %eax
2817 subl $foo@tpoff, %eax
2818 (6 byte form of subl). */
2819 roff = rel->r_offset + 5;
2820 }
2821 else
2822 {
2823 /* Change
2824 leal foo@tlsgd(%ebx), %eax
2825 call ___tls_get_addr@PLT
2826 nop
2827 or
2828 leal foo@tlsgd(%reg), %eax
2829 call *___tls_get_addr@GOT(%reg)
2830 which may be converted to
2831 addr32 call ___tls_get_addr
2832 into:
2833 movl %gs:0, %eax; subl $foo@tpoff, %eax
2834 (6 byte form of subl). */
2835 roff = rel->r_offset + 6;
2836 }
2837 memcpy (contents + roff - 8,
2838 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2839 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2840 contents + roff);
2841 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2842 rel++;
2843 wrel++;
2844 continue;
2845 }
2846 else if (r_type == R_386_TLS_GOTDESC)
2847 {
2848 /* GDesc -> LE transition.
2849 It's originally something like:
2850 leal x@tlsdesc(%ebx), %eax
2851
2852 leal x@ntpoff, %eax
2853
2854 Registers other than %eax may be set up here. */
2855
2856 unsigned int val;
2857 bfd_vma roff;
2858
2859 roff = rel->r_offset;
2860 val = bfd_get_8 (input_bfd, contents + roff - 1);
2861
2862 /* Now modify the instruction as appropriate. */
2863 /* aoliva FIXME: remove the above and xor the byte
2864 below with 0x86. */
2865 bfd_put_8 (output_bfd, val ^ 0x86,
2866 contents + roff - 1);
2867 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2868 contents + roff);
2869 continue;
2870 }
2871 else if (r_type == R_386_TLS_DESC_CALL)
2872 {
2873 /* GDesc -> LE transition.
2874 It's originally:
2875 call *(%eax)
2876 Turn it into:
2877 xchg %ax,%ax */
2878
2879 bfd_vma roff;
2880
2881 roff = rel->r_offset;
2882 bfd_put_8 (output_bfd, 0x66, contents + roff);
2883 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2884 continue;
2885 }
2886 else if (r_type == R_386_TLS_IE)
2887 {
2888 unsigned int val;
2889
2890 /* IE->LE transition:
2891 Originally it can be one of:
2892 movl foo, %eax
2893 movl foo, %reg
2894 addl foo, %reg
2895 We change it into:
2896 movl $foo, %eax
2897 movl $foo, %reg
2898 addl $foo, %reg. */
2899 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2900 if (val == 0xa1)
2901 {
2902 /* movl foo, %eax. */
2903 bfd_put_8 (output_bfd, 0xb8,
2904 contents + rel->r_offset - 1);
2905 }
2906 else
2907 {
2908 unsigned int type;
2909
2910 type = bfd_get_8 (input_bfd,
2911 contents + rel->r_offset - 2);
2912 switch (type)
2913 {
2914 case 0x8b:
2915 /* movl */
2916 bfd_put_8 (output_bfd, 0xc7,
2917 contents + rel->r_offset - 2);
2918 bfd_put_8 (output_bfd,
2919 0xc0 | ((val >> 3) & 7),
2920 contents + rel->r_offset - 1);
2921 break;
2922 case 0x03:
2923 /* addl */
2924 bfd_put_8 (output_bfd, 0x81,
2925 contents + rel->r_offset - 2);
2926 bfd_put_8 (output_bfd,
2927 0xc0 | ((val >> 3) & 7),
2928 contents + rel->r_offset - 1);
2929 break;
2930 default:
2931 BFD_FAIL ();
2932 break;
2933 }
2934 }
2935 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2936 contents + rel->r_offset);
2937 continue;
2938 }
2939 else
2940 {
2941 unsigned int val, type;
2942
2943 /* {IE_32,GOTIE}->LE transition:
2944 Originally it can be one of:
2945 subl foo(%reg1), %reg2
2946 movl foo(%reg1), %reg2
2947 addl foo(%reg1), %reg2
2948 We change it into:
2949 subl $foo, %reg2
2950 movl $foo, %reg2 (6 byte form)
2951 addl $foo, %reg2. */
2952 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2953 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2954 if (type == 0x8b)
2955 {
2956 /* movl */
2957 bfd_put_8 (output_bfd, 0xc7,
2958 contents + rel->r_offset - 2);
2959 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2960 contents + rel->r_offset - 1);
2961 }
2962 else if (type == 0x2b)
2963 {
2964 /* subl */
2965 bfd_put_8 (output_bfd, 0x81,
2966 contents + rel->r_offset - 2);
2967 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2968 contents + rel->r_offset - 1);
2969 }
2970 else if (type == 0x03)
2971 {
2972 /* addl */
2973 bfd_put_8 (output_bfd, 0x81,
2974 contents + rel->r_offset - 2);
2975 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2976 contents + rel->r_offset - 1);
2977 }
2978 else
2979 BFD_FAIL ();
2980 if (r_type == R_386_TLS_GOTIE)
2981 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2982 contents + rel->r_offset);
2983 else
2984 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2985 contents + rel->r_offset);
2986 continue;
2987 }
2988 }
2989
2990 if (htab->elf.sgot == NULL)
2991 abort ();
2992
2993 if (h != NULL)
2994 {
2995 off = h->got.offset;
2996 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
2997 }
2998 else
2999 {
3000 if (local_got_offsets == NULL)
3001 abort ();
3002
3003 off = local_got_offsets[r_symndx];
3004 offplt = local_tlsdesc_gotents[r_symndx];
3005 }
3006
3007 if ((off & 1) != 0)
3008 off &= ~1;
3009 else
3010 {
3011 Elf_Internal_Rela outrel;
3012 int dr_type;
3013 asection *sreloc;
3014
3015 if (htab->elf.srelgot == NULL)
3016 abort ();
3017
3018 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3019
3020 if (GOT_TLS_GDESC_P (tls_type))
3021 {
3022 bfd_byte *loc;
3023 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3024 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3025 <= htab->elf.sgotplt->size);
3026 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3027 + htab->elf.sgotplt->output_offset
3028 + offplt
3029 + htab->sgotplt_jump_table_size);
3030 sreloc = htab->elf.srelplt;
3031 loc = sreloc->contents;
3032 loc += (htab->next_tls_desc_index++
3033 * sizeof (Elf32_External_Rel));
3034 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3035 <= sreloc->contents + sreloc->size);
3036 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3037 if (indx == 0)
3038 {
3039 BFD_ASSERT (! unresolved_reloc);
3040 bfd_put_32 (output_bfd,
3041 relocation - _bfd_x86_elf_dtpoff_base (info),
3042 htab->elf.sgotplt->contents + offplt
3043 + htab->sgotplt_jump_table_size + 4);
3044 }
3045 else
3046 {
3047 bfd_put_32 (output_bfd, 0,
3048 htab->elf.sgotplt->contents + offplt
3049 + htab->sgotplt_jump_table_size + 4);
3050 }
3051 }
3052
3053 sreloc = htab->elf.srelgot;
3054
3055 outrel.r_offset = (htab->elf.sgot->output_section->vma
3056 + htab->elf.sgot->output_offset + off);
3057
3058 if (GOT_TLS_GD_P (tls_type))
3059 dr_type = R_386_TLS_DTPMOD32;
3060 else if (GOT_TLS_GDESC_P (tls_type))
3061 goto dr_done;
3062 else if (tls_type == GOT_TLS_IE_POS)
3063 dr_type = R_386_TLS_TPOFF;
3064 else
3065 dr_type = R_386_TLS_TPOFF32;
3066
3067 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3068 bfd_put_32 (output_bfd,
3069 relocation - _bfd_x86_elf_dtpoff_base (info),
3070 htab->elf.sgot->contents + off);
3071 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3072 bfd_put_32 (output_bfd,
3073 _bfd_x86_elf_dtpoff_base (info) - relocation,
3074 htab->elf.sgot->contents + off);
3075 else if (dr_type != R_386_TLS_DESC)
3076 bfd_put_32 (output_bfd, 0,
3077 htab->elf.sgot->contents + off);
3078 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3079
3080 elf_append_rel (output_bfd, sreloc, &outrel);
3081
3082 if (GOT_TLS_GD_P (tls_type))
3083 {
3084 if (indx == 0)
3085 {
3086 BFD_ASSERT (! unresolved_reloc);
3087 bfd_put_32 (output_bfd,
3088 relocation - _bfd_x86_elf_dtpoff_base (info),
3089 htab->elf.sgot->contents + off + 4);
3090 }
3091 else
3092 {
3093 bfd_put_32 (output_bfd, 0,
3094 htab->elf.sgot->contents + off + 4);
3095 outrel.r_info = ELF32_R_INFO (indx,
3096 R_386_TLS_DTPOFF32);
3097 outrel.r_offset += 4;
3098 elf_append_rel (output_bfd, sreloc, &outrel);
3099 }
3100 }
3101 else if (tls_type == GOT_TLS_IE_BOTH)
3102 {
3103 bfd_put_32 (output_bfd,
3104 (indx == 0
3105 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3106 : 0),
3107 htab->elf.sgot->contents + off + 4);
3108 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3109 outrel.r_offset += 4;
3110 elf_append_rel (output_bfd, sreloc, &outrel);
3111 }
3112
3113 dr_done:
3114 if (h != NULL)
3115 h->got.offset |= 1;
3116 else
3117 local_got_offsets[r_symndx] |= 1;
3118 }
3119
3120 if (off >= (bfd_vma) -2
3121 && ! GOT_TLS_GDESC_P (tls_type))
3122 abort ();
3123 if (r_type_tls == R_386_TLS_GOTDESC
3124 || r_type_tls == R_386_TLS_DESC_CALL)
3125 {
3126 relocation = htab->sgotplt_jump_table_size + offplt;
3127 unresolved_reloc = FALSE;
3128 }
3129 else if (r_type_tls == r_type)
3130 {
3131 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3132 + htab->elf.sgotplt->output_offset;
3133 relocation = htab->elf.sgot->output_section->vma
3134 + htab->elf.sgot->output_offset + off - g_o_t;
3135 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3136 && tls_type == GOT_TLS_IE_BOTH)
3137 relocation += 4;
3138 if (r_type == R_386_TLS_IE)
3139 relocation += g_o_t;
3140 unresolved_reloc = FALSE;
3141 }
3142 else if (r_type == R_386_TLS_GD)
3143 {
3144 unsigned int val, type;
3145 bfd_vma roff;
3146
3147 /* GD->IE transition. */
3148 type = *(contents + rel->r_offset - 2);
3149 val = *(contents + rel->r_offset - 1);
3150 if (type == 0x04)
3151 {
3152 /* Change
3153 leal foo@tlsgd(,%ebx,1), %eax
3154 call ___tls_get_addr@PLT
3155 into:
3156 movl %gs:0, %eax
3157 subl $foo@gottpoff(%ebx), %eax. */
3158 val >>= 3;
3159 roff = rel->r_offset - 3;
3160 }
3161 else
3162 {
3163 /* Change
3164 leal foo@tlsgd(%ebx), %eax
3165 call ___tls_get_addr@PLT
3166 nop
3167 or
3168 leal foo@tlsgd(%reg), %eax
3169 call *___tls_get_addr@GOT(%reg)
3170 which may be converted to
3171 addr32 call ___tls_get_addr
3172 into:
3173 movl %gs:0, %eax;
3174 subl $foo@gottpoff(%reg), %eax. */
3175 roff = rel->r_offset - 2;
3176 }
3177 memcpy (contents + roff,
3178 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3179 contents[roff + 7] = 0x80 | (val & 7);
3180 /* If foo is used only with foo@gotntpoff(%reg) and
3181 foo@indntpoff, but not with foo@gottpoff(%reg), change
3182 subl $foo@gottpoff(%reg), %eax
3183 into:
3184 addl $foo@gotntpoff(%reg), %eax. */
3185 if (tls_type == GOT_TLS_IE_POS)
3186 contents[roff + 6] = 0x03;
3187 bfd_put_32 (output_bfd,
3188 htab->elf.sgot->output_section->vma
3189 + htab->elf.sgot->output_offset + off
3190 - htab->elf.sgotplt->output_section->vma
3191 - htab->elf.sgotplt->output_offset,
3192 contents + roff + 8);
3193 /* Skip R_386_PLT32 and R_386_GOT32X. */
3194 rel++;
3195 wrel++;
3196 continue;
3197 }
3198 else if (r_type == R_386_TLS_GOTDESC)
3199 {
3200 /* GDesc -> IE transition.
3201 It's originally something like:
3202 leal x@tlsdesc(%ebx), %eax
3203
3204 Change it to:
3205 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3206 or:
3207 movl x@gottpoff(%ebx), %eax # before negl %eax
3208
3209 Registers other than %eax may be set up here. */
3210
3211 bfd_vma roff;
3212
3213 /* First, make sure it's a leal adding ebx to a 32-bit
3214 offset into any register, although it's probably
3215 almost always going to be eax. */
3216 roff = rel->r_offset;
3217
3218 /* Now modify the instruction as appropriate. */
3219 /* To turn a leal into a movl in the form we use it, it
3220 suffices to change the first byte from 0x8d to 0x8b.
3221 aoliva FIXME: should we decide to keep the leal, all
3222 we have to do is remove the statement below, and
3223 adjust the relaxation of R_386_TLS_DESC_CALL. */
3224 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3225
3226 if (tls_type == GOT_TLS_IE_BOTH)
3227 off += 4;
3228
3229 bfd_put_32 (output_bfd,
3230 htab->elf.sgot->output_section->vma
3231 + htab->elf.sgot->output_offset + off
3232 - htab->elf.sgotplt->output_section->vma
3233 - htab->elf.sgotplt->output_offset,
3234 contents + roff);
3235 continue;
3236 }
3237 else if (r_type == R_386_TLS_DESC_CALL)
3238 {
3239 /* GDesc -> IE transition.
3240 It's originally:
3241 call *(%eax)
3242
3243 Change it to:
3244 xchg %ax,%ax
3245 or
3246 negl %eax
3247 depending on how we transformed the TLS_GOTDESC above.
3248 */
3249
3250 bfd_vma roff;
3251
3252 roff = rel->r_offset;
3253
3254 /* Now modify the instruction as appropriate. */
3255 if (tls_type != GOT_TLS_IE_NEG)
3256 {
3257 /* xchg %ax,%ax */
3258 bfd_put_8 (output_bfd, 0x66, contents + roff);
3259 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3260 }
3261 else
3262 {
3263 /* negl %eax */
3264 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3265 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3266 }
3267
3268 continue;
3269 }
3270 else
3271 BFD_ASSERT (FALSE);
3272 break;
3273
3274 case R_386_TLS_LDM:
3275 if (! elf_i386_tls_transition (info, input_bfd,
3276 input_section, contents,
3277 symtab_hdr, sym_hashes,
3278 &r_type, GOT_UNKNOWN, rel,
3279 relend, h, r_symndx, TRUE))
3280 return FALSE;
3281
3282 if (r_type != R_386_TLS_LDM)
3283 {
3284 /* LD->LE transition. Change
3285 leal foo@tlsldm(%ebx) %eax
3286 call ___tls_get_addr@PLT
3287 into:
3288 movl %gs:0, %eax
3289 nop
3290 leal 0(%esi,1), %esi
3291 or change
3292 leal foo@tlsldm(%reg) %eax
3293 call *___tls_get_addr@GOT(%reg)
3294 which may be converted to
3295 addr32 call ___tls_get_addr
3296 into:
3297 movl %gs:0, %eax
3298 leal 0(%esi), %esi */
3299 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3300 if (*(contents + rel->r_offset + 4) == 0xff
3301 || *(contents + rel->r_offset + 4) == 0x67)
3302 memcpy (contents + rel->r_offset - 2,
3303 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3304 else
3305 memcpy (contents + rel->r_offset - 2,
3306 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3307 /* Skip R_386_PC32/R_386_PLT32. */
3308 rel++;
3309 wrel++;
3310 continue;
3311 }
3312
3313 if (htab->elf.sgot == NULL)
3314 abort ();
3315
3316 off = htab->tls_ld_or_ldm_got.offset;
3317 if (off & 1)
3318 off &= ~1;
3319 else
3320 {
3321 Elf_Internal_Rela outrel;
3322
3323 if (htab->elf.srelgot == NULL)
3324 abort ();
3325
3326 outrel.r_offset = (htab->elf.sgot->output_section->vma
3327 + htab->elf.sgot->output_offset + off);
3328
3329 bfd_put_32 (output_bfd, 0,
3330 htab->elf.sgot->contents + off);
3331 bfd_put_32 (output_bfd, 0,
3332 htab->elf.sgot->contents + off + 4);
3333 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3334 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3335 htab->tls_ld_or_ldm_got.offset |= 1;
3336 }
3337 relocation = htab->elf.sgot->output_section->vma
3338 + htab->elf.sgot->output_offset + off
3339 - htab->elf.sgotplt->output_section->vma
3340 - htab->elf.sgotplt->output_offset;
3341 unresolved_reloc = FALSE;
3342 break;
3343
3344 case R_386_TLS_LDO_32:
3345 if (!bfd_link_executable (info)
3346 || (input_section->flags & SEC_CODE) == 0)
3347 relocation -= _bfd_x86_elf_dtpoff_base (info);
3348 else
3349 /* When converting LDO to LE, we must negate. */
3350 relocation = -elf_i386_tpoff (info, relocation);
3351 break;
3352
3353 case R_386_TLS_LE_32:
3354 case R_386_TLS_LE:
3355 if (!bfd_link_executable (info))
3356 {
3357 Elf_Internal_Rela outrel;
3358 asection *sreloc;
3359
3360 outrel.r_offset = rel->r_offset
3361 + input_section->output_section->vma
3362 + input_section->output_offset;
3363 if (h != NULL && h->dynindx != -1)
3364 indx = h->dynindx;
3365 else
3366 indx = 0;
3367 if (r_type == R_386_TLS_LE_32)
3368 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3369 else
3370 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3371 sreloc = elf_section_data (input_section)->sreloc;
3372 if (sreloc == NULL)
3373 abort ();
3374 elf_append_rel (output_bfd, sreloc, &outrel);
3375 if (indx)
3376 continue;
3377 else if (r_type == R_386_TLS_LE_32)
3378 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3379 else
3380 relocation -= _bfd_x86_elf_dtpoff_base (info);
3381 }
3382 else if (r_type == R_386_TLS_LE_32)
3383 relocation = elf_i386_tpoff (info, relocation);
3384 else
3385 relocation = -elf_i386_tpoff (info, relocation);
3386 break;
3387
3388 default:
3389 break;
3390 }
3391
3392 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3393 because such sections are not SEC_ALLOC and thus ld.so will
3394 not process them. */
3395 if (unresolved_reloc
3396 && !((input_section->flags & SEC_DEBUGGING) != 0
3397 && h->def_dynamic)
3398 && _bfd_elf_section_offset (output_bfd, info, input_section,
3399 rel->r_offset) != (bfd_vma) -1)
3400 {
3401 _bfd_error_handler
3402 /* xgettext:c-format */
3403 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3404 input_bfd,
3405 input_section,
3406 (uint64_t) rel->r_offset,
3407 howto->name,
3408 h->root.root.string);
3409 return FALSE;
3410 }
3411
3412 do_relocation:
3413 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3414 contents, rel->r_offset,
3415 relocation, 0);
3416
3417 check_relocation_error:
3418 if (r != bfd_reloc_ok)
3419 {
3420 const char *name;
3421
3422 if (h != NULL)
3423 name = h->root.root.string;
3424 else
3425 {
3426 name = bfd_elf_string_from_elf_section (input_bfd,
3427 symtab_hdr->sh_link,
3428 sym->st_name);
3429 if (name == NULL)
3430 return FALSE;
3431 if (*name == '\0')
3432 name = bfd_section_name (sec);
3433 }
3434
3435 if (r == bfd_reloc_overflow)
3436 (*info->callbacks->reloc_overflow)
3437 (info, (h ? &h->root : NULL), name, howto->name,
3438 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3439 else
3440 {
3441 _bfd_error_handler
3442 /* xgettext:c-format */
3443 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3444 input_bfd, input_section,
3445 (uint64_t) rel->r_offset, name, (int) r);
3446 return FALSE;
3447 }
3448 }
3449
3450 if (wrel != rel)
3451 *wrel = *rel;
3452 }
3453
3454 if (wrel != rel)
3455 {
3456 Elf_Internal_Shdr *rel_hdr;
3457 size_t deleted = rel - wrel;
3458
3459 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3460 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3461 if (rel_hdr->sh_size == 0)
3462 {
3463 /* It is too late to remove an empty reloc section. Leave
3464 one NONE reloc.
3465 ??? What is wrong with an empty section??? */
3466 rel_hdr->sh_size = rel_hdr->sh_entsize;
3467 deleted -= 1;
3468 }
3469 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3470 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3471 input_section->reloc_count -= deleted;
3472 }
3473
3474 return TRUE;
3475 }
3476
3477 /* Finish up dynamic symbol handling. We set the contents of various
3478 dynamic sections here. */
3479
3480 static bfd_boolean
3481 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3482 struct bfd_link_info *info,
3483 struct elf_link_hash_entry *h,
3484 Elf_Internal_Sym *sym)
3485 {
3486 struct elf_x86_link_hash_table *htab;
3487 unsigned plt_entry_size;
3488 struct elf_x86_link_hash_entry *eh;
3489 bfd_boolean local_undefweak;
3490 bfd_boolean use_plt_second;
3491
3492 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3493 if (htab == NULL)
3494 return FALSE;
3495
3496 plt_entry_size = htab->plt.plt_entry_size;
3497
3498 /* Use the second PLT section only if there is .plt section. */
3499 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3500
3501 eh = (struct elf_x86_link_hash_entry *) h;
3502 if (eh->no_finish_dynamic_symbol)
3503 abort ();
3504
3505 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3506 resolved undefined weak symbols in executable so that their
3507 references have value 0 at run-time. */
3508 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3509
3510 if (h->plt.offset != (bfd_vma) -1)
3511 {
3512 bfd_vma plt_index, plt_offset;
3513 bfd_vma got_offset;
3514 Elf_Internal_Rela rel;
3515 bfd_byte *loc;
3516 asection *plt, *resolved_plt, *gotplt, *relplt;
3517
3518 /* When building a static executable, use .iplt, .igot.plt and
3519 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3520 if (htab->elf.splt != NULL)
3521 {
3522 plt = htab->elf.splt;
3523 gotplt = htab->elf.sgotplt;
3524 relplt = htab->elf.srelplt;
3525 }
3526 else
3527 {
3528 plt = htab->elf.iplt;
3529 gotplt = htab->elf.igotplt;
3530 relplt = htab->elf.irelplt;
3531 }
3532
3533 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3534
3535 /* Get the index in the procedure linkage table which
3536 corresponds to this symbol. This is the index of this symbol
3537 in all the symbols for which we are making plt entries. The
3538 first entry in the procedure linkage table is reserved.
3539
3540 Get the offset into the .got table of the entry that
3541 corresponds to this function. Each .got entry is 4 bytes.
3542 The first three are reserved.
3543
3544 For static executables, we don't reserve anything. */
3545
3546 if (plt == htab->elf.splt)
3547 {
3548 got_offset = (h->plt.offset / plt_entry_size
3549 - htab->plt.has_plt0);
3550 got_offset = (got_offset + 3) * 4;
3551 }
3552 else
3553 {
3554 got_offset = h->plt.offset / plt_entry_size;
3555 got_offset = got_offset * 4;
3556 }
3557
3558 /* Fill in the entry in the procedure linkage table and update
3559 the first slot. */
3560 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3561 plt_entry_size);
3562
3563 if (use_plt_second)
3564 {
3565 const bfd_byte *plt_entry;
3566 if (bfd_link_pic (info))
3567 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3568 else
3569 plt_entry = htab->non_lazy_plt->plt_entry;
3570 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3571 plt_entry, htab->non_lazy_plt->plt_entry_size);
3572
3573 resolved_plt = htab->plt_second;
3574 plt_offset = eh->plt_second.offset;
3575 }
3576 else
3577 {
3578 resolved_plt = plt;
3579 plt_offset = h->plt.offset;
3580 }
3581
3582 if (! bfd_link_pic (info))
3583 {
3584 bfd_put_32 (output_bfd,
3585 (gotplt->output_section->vma
3586 + gotplt->output_offset
3587 + got_offset),
3588 resolved_plt->contents + plt_offset
3589 + htab->plt.plt_got_offset);
3590
3591 if (htab->elf.target_os == is_vxworks)
3592 {
3593 int s, k, reloc_index;
3594
3595 /* Create the R_386_32 relocation referencing the GOT
3596 for this PLT entry. */
3597
3598 /* S: Current slot number (zero-based). */
3599 s = ((h->plt.offset - htab->plt.plt_entry_size)
3600 / htab->plt.plt_entry_size);
3601 /* K: Number of relocations for PLTResolve. */
3602 if (bfd_link_pic (info))
3603 k = PLTRESOLVE_RELOCS_SHLIB;
3604 else
3605 k = PLTRESOLVE_RELOCS;
3606 /* Skip the PLTresolve relocations, and the relocations for
3607 the other PLT slots. */
3608 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3609 loc = (htab->srelplt2->contents + reloc_index
3610 * sizeof (Elf32_External_Rel));
3611
3612 rel.r_offset = (plt->output_section->vma
3613 + plt->output_offset
3614 + h->plt.offset + 2),
3615 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3616 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3617
3618 /* Create the R_386_32 relocation referencing the beginning of
3619 the PLT for this GOT entry. */
3620 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3621 + htab->elf.sgotplt->output_offset
3622 + got_offset);
3623 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3624 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3625 loc + sizeof (Elf32_External_Rel));
3626 }
3627 }
3628 else
3629 {
3630 bfd_put_32 (output_bfd, got_offset,
3631 resolved_plt->contents + plt_offset
3632 + htab->plt.plt_got_offset);
3633 }
3634
3635 /* Fill in the entry in the global offset table. Leave the entry
3636 as zero for undefined weak symbol in PIE. No PLT relocation
3637 against undefined weak symbol in PIE. */
3638 if (!local_undefweak)
3639 {
3640 if (htab->plt.has_plt0)
3641 bfd_put_32 (output_bfd,
3642 (plt->output_section->vma
3643 + plt->output_offset
3644 + h->plt.offset
3645 + htab->lazy_plt->plt_lazy_offset),
3646 gotplt->contents + got_offset);
3647
3648 /* Fill in the entry in the .rel.plt section. */
3649 rel.r_offset = (gotplt->output_section->vma
3650 + gotplt->output_offset
3651 + got_offset);
3652 if (PLT_LOCAL_IFUNC_P (info, h))
3653 {
3654 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3655 h->root.root.string,
3656 h->root.u.def.section->owner);
3657
3658 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3659 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3660 in the .got.plt section. */
3661 bfd_put_32 (output_bfd,
3662 (h->root.u.def.value
3663 + h->root.u.def.section->output_section->vma
3664 + h->root.u.def.section->output_offset),
3665 gotplt->contents + got_offset);
3666 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3667 /* R_386_IRELATIVE comes last. */
3668 plt_index = htab->next_irelative_index--;
3669 }
3670 else
3671 {
3672 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3673 plt_index = htab->next_jump_slot_index++;
3674 }
3675
3676 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3677 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3678
3679 /* Don't fill the second and third slots in PLT entry for
3680 static executables nor without PLT0. */
3681 if (plt == htab->elf.splt && htab->plt.has_plt0)
3682 {
3683 bfd_put_32 (output_bfd,
3684 plt_index * sizeof (Elf32_External_Rel),
3685 plt->contents + h->plt.offset
3686 + htab->lazy_plt->plt_reloc_offset);
3687 bfd_put_32 (output_bfd,
3688 - (h->plt.offset
3689 + htab->lazy_plt->plt_plt_offset + 4),
3690 (plt->contents + h->plt.offset
3691 + htab->lazy_plt->plt_plt_offset));
3692 }
3693 }
3694 }
3695 else if (eh->plt_got.offset != (bfd_vma) -1)
3696 {
3697 bfd_vma got_offset, plt_offset;
3698 asection *plt, *got, *gotplt;
3699 const bfd_byte *got_plt_entry;
3700
3701 /* Set the entry in the GOT procedure linkage table. */
3702 plt = htab->plt_got;
3703 got = htab->elf.sgot;
3704 gotplt = htab->elf.sgotplt;
3705 got_offset = h->got.offset;
3706
3707 if (got_offset == (bfd_vma) -1
3708 || plt == NULL
3709 || got == NULL
3710 || gotplt == NULL)
3711 abort ();
3712
3713 /* Fill in the entry in the GOT procedure linkage table. */
3714 if (! bfd_link_pic (info))
3715 {
3716 got_plt_entry = htab->non_lazy_plt->plt_entry;
3717 got_offset += got->output_section->vma + got->output_offset;
3718 }
3719 else
3720 {
3721 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3722 got_offset += (got->output_section->vma
3723 + got->output_offset
3724 - gotplt->output_section->vma
3725 - gotplt->output_offset);
3726 }
3727
3728 plt_offset = eh->plt_got.offset;
3729 memcpy (plt->contents + plt_offset, got_plt_entry,
3730 htab->non_lazy_plt->plt_entry_size);
3731 bfd_put_32 (output_bfd, got_offset,
3732 (plt->contents + plt_offset
3733 + htab->non_lazy_plt->plt_got_offset));
3734 }
3735
3736 if (!local_undefweak
3737 && !h->def_regular
3738 && (h->plt.offset != (bfd_vma) -1
3739 || eh->plt_got.offset != (bfd_vma) -1))
3740 {
3741 /* Mark the symbol as undefined, rather than as defined in
3742 the .plt section. Leave the value if there were any
3743 relocations where pointer equality matters (this is a clue
3744 for the dynamic linker, to make function pointer
3745 comparisons work between an application and shared
3746 library), otherwise set it to zero. If a function is only
3747 called from a binary, there is no need to slow down
3748 shared libraries because of that. */
3749 sym->st_shndx = SHN_UNDEF;
3750 if (!h->pointer_equality_needed)
3751 sym->st_value = 0;
3752 }
3753
3754 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3755
3756 /* Don't generate dynamic GOT relocation against undefined weak
3757 symbol in executable. */
3758 if (h->got.offset != (bfd_vma) -1
3759 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3760 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3761 && !local_undefweak)
3762 {
3763 Elf_Internal_Rela rel;
3764 asection *relgot = htab->elf.srelgot;
3765
3766 /* This symbol has an entry in the global offset table. Set it
3767 up. */
3768
3769 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3770 abort ();
3771
3772 rel.r_offset = (htab->elf.sgot->output_section->vma
3773 + htab->elf.sgot->output_offset
3774 + (h->got.offset & ~(bfd_vma) 1));
3775
3776 /* If this is a static link, or it is a -Bsymbolic link and the
3777 symbol is defined locally or was forced to be local because
3778 of a version file, we just want to emit a RELATIVE reloc.
3779 The entry in the global offset table will already have been
3780 initialized in the relocate_section function. */
3781 if (h->def_regular
3782 && h->type == STT_GNU_IFUNC)
3783 {
3784 if (h->plt.offset == (bfd_vma) -1)
3785 {
3786 /* STT_GNU_IFUNC is referenced without PLT. */
3787 if (htab->elf.splt == NULL)
3788 {
3789 /* use .rel[a].iplt section to store .got relocations
3790 in static executable. */
3791 relgot = htab->elf.irelplt;
3792 }
3793 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3794 {
3795 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3796 h->root.root.string,
3797 h->root.u.def.section->owner);
3798
3799 bfd_put_32 (output_bfd,
3800 (h->root.u.def.value
3801 + h->root.u.def.section->output_section->vma
3802 + h->root.u.def.section->output_offset),
3803 htab->elf.sgot->contents + h->got.offset);
3804 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3805 }
3806 else
3807 goto do_glob_dat;
3808 }
3809 else if (bfd_link_pic (info))
3810 {
3811 /* Generate R_386_GLOB_DAT. */
3812 goto do_glob_dat;
3813 }
3814 else
3815 {
3816 asection *plt;
3817 bfd_vma plt_offset;
3818
3819 if (!h->pointer_equality_needed)
3820 abort ();
3821
3822 /* For non-shared object, we can't use .got.plt, which
3823 contains the real function addres if we need pointer
3824 equality. We load the GOT entry with the PLT entry. */
3825 if (htab->plt_second != NULL)
3826 {
3827 plt = htab->plt_second;
3828 plt_offset = eh->plt_second.offset;
3829 }
3830 else
3831 {
3832 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3833 plt_offset = h->plt.offset;
3834 }
3835 bfd_put_32 (output_bfd,
3836 (plt->output_section->vma
3837 + plt->output_offset + plt_offset),
3838 htab->elf.sgot->contents + h->got.offset);
3839 return TRUE;
3840 }
3841 }
3842 else if (bfd_link_pic (info)
3843 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3844 {
3845 BFD_ASSERT((h->got.offset & 1) != 0);
3846 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3847 }
3848 else
3849 {
3850 BFD_ASSERT((h->got.offset & 1) == 0);
3851 do_glob_dat:
3852 bfd_put_32 (output_bfd, (bfd_vma) 0,
3853 htab->elf.sgot->contents + h->got.offset);
3854 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3855 }
3856
3857 elf_append_rel (output_bfd, relgot, &rel);
3858 }
3859
3860 if (h->needs_copy)
3861 {
3862 Elf_Internal_Rela rel;
3863 asection *s;
3864
3865 /* This symbol needs a copy reloc. Set it up. */
3866 VERIFY_COPY_RELOC (h, htab)
3867
3868 rel.r_offset = (h->root.u.def.value
3869 + h->root.u.def.section->output_section->vma
3870 + h->root.u.def.section->output_offset);
3871 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3872 if (h->root.u.def.section == htab->elf.sdynrelro)
3873 s = htab->elf.sreldynrelro;
3874 else
3875 s = htab->elf.srelbss;
3876 elf_append_rel (output_bfd, s, &rel);
3877 }
3878
3879 return TRUE;
3880 }
3881
3882 /* Finish up local dynamic symbol handling. We set the contents of
3883 various dynamic sections here. */
3884
3885 static bfd_boolean
3886 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3887 {
3888 struct elf_link_hash_entry *h
3889 = (struct elf_link_hash_entry *) *slot;
3890 struct bfd_link_info *info
3891 = (struct bfd_link_info *) inf;
3892
3893 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3894 h, NULL);
3895 }
3896
3897 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3898 here since undefined weak symbol may not be dynamic and may not be
3899 called for elf_i386_finish_dynamic_symbol. */
3900
3901 static bfd_boolean
3902 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3903 void *inf)
3904 {
3905 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3906 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3907
3908 if (h->root.type != bfd_link_hash_undefweak
3909 || h->dynindx != -1)
3910 return TRUE;
3911
3912 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3913 info, h, NULL);
3914 }
3915
3916 /* Used to decide how to sort relocs in an optimal manner for the
3917 dynamic linker, before writing them out. */
3918
3919 static enum elf_reloc_type_class
3920 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3921 const asection *rel_sec ATTRIBUTE_UNUSED,
3922 const Elf_Internal_Rela *rela)
3923 {
3924 bfd *abfd = info->output_bfd;
3925 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3926 struct elf_link_hash_table *htab = elf_hash_table (info);
3927
3928 if (htab->dynsym != NULL
3929 && htab->dynsym->contents != NULL)
3930 {
3931 /* Check relocation against STT_GNU_IFUNC symbol if there are
3932 dynamic symbols. */
3933 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3934 if (r_symndx != STN_UNDEF)
3935 {
3936 Elf_Internal_Sym sym;
3937 if (!bed->s->swap_symbol_in (abfd,
3938 (htab->dynsym->contents
3939 + r_symndx * sizeof (Elf32_External_Sym)),
3940 0, &sym))
3941 abort ();
3942
3943 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3944 return reloc_class_ifunc;
3945 }
3946 }
3947
3948 switch (ELF32_R_TYPE (rela->r_info))
3949 {
3950 case R_386_IRELATIVE:
3951 return reloc_class_ifunc;
3952 case R_386_RELATIVE:
3953 return reloc_class_relative;
3954 case R_386_JUMP_SLOT:
3955 return reloc_class_plt;
3956 case R_386_COPY:
3957 return reloc_class_copy;
3958 default:
3959 return reloc_class_normal;
3960 }
3961 }
3962
3963 /* Finish up the dynamic sections. */
3964
3965 static bfd_boolean
3966 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3967 struct bfd_link_info *info)
3968 {
3969 struct elf_x86_link_hash_table *htab;
3970
3971 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3972 if (htab == NULL)
3973 return FALSE;
3974
3975 if (!htab->elf.dynamic_sections_created)
3976 return TRUE;
3977
3978 if (htab->elf.splt && htab->elf.splt->size > 0)
3979 {
3980 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3981 really seem like the right value. */
3982 elf_section_data (htab->elf.splt->output_section)
3983 ->this_hdr.sh_entsize = 4;
3984
3985 if (htab->plt.has_plt0)
3986 {
3987 /* Fill in the special first entry in the procedure linkage
3988 table. */
3989 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3990 htab->lazy_plt->plt0_entry_size);
3991 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
3992 htab->plt0_pad_byte,
3993 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
3994 if (!bfd_link_pic (info))
3995 {
3996 bfd_put_32 (output_bfd,
3997 (htab->elf.sgotplt->output_section->vma
3998 + htab->elf.sgotplt->output_offset
3999 + 4),
4000 htab->elf.splt->contents
4001 + htab->lazy_plt->plt0_got1_offset);
4002 bfd_put_32 (output_bfd,
4003 (htab->elf.sgotplt->output_section->vma
4004 + htab->elf.sgotplt->output_offset
4005 + 8),
4006 htab->elf.splt->contents
4007 + htab->lazy_plt->plt0_got2_offset);
4008
4009 if (htab->elf.target_os == is_vxworks)
4010 {
4011 Elf_Internal_Rela rel;
4012 int num_plts = (htab->elf.splt->size
4013 / htab->plt.plt_entry_size) - 1;
4014 unsigned char *p;
4015 asection *srelplt2 = htab->srelplt2;
4016
4017 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4018 + 4. On IA32 we use REL relocations so the
4019 addend goes in the PLT directly. */
4020 rel.r_offset = (htab->elf.splt->output_section->vma
4021 + htab->elf.splt->output_offset
4022 + htab->lazy_plt->plt0_got1_offset);
4023 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4024 R_386_32);
4025 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4026 srelplt2->contents);
4027 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4028 + 8. */
4029 rel.r_offset = (htab->elf.splt->output_section->vma
4030 + htab->elf.splt->output_offset
4031 + htab->lazy_plt->plt0_got2_offset);
4032 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4033 R_386_32);
4034 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4035 srelplt2->contents +
4036 sizeof (Elf32_External_Rel));
4037 /* Correct the .rel.plt.unloaded relocations. */
4038 p = srelplt2->contents;
4039 if (bfd_link_pic (info))
4040 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4041 else
4042 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4043
4044 for (; num_plts; num_plts--)
4045 {
4046 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4047 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4048 R_386_32);
4049 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4050 p += sizeof (Elf32_External_Rel);
4051
4052 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4053 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4054 R_386_32);
4055 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4056 p += sizeof (Elf32_External_Rel);
4057 }
4058 }
4059 }
4060 }
4061 }
4062
4063 /* Fill PLT entries for undefined weak symbols in PIE. */
4064 if (bfd_link_pie (info))
4065 bfd_hash_traverse (&info->hash->table,
4066 elf_i386_pie_finish_undefweak_symbol,
4067 info);
4068
4069 return TRUE;
4070 }
4071
4072 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4073 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4074 It has to be done before elf_link_sort_relocs is called so that
4075 dynamic relocations are properly sorted. */
4076
4077 static bfd_boolean
4078 elf_i386_output_arch_local_syms
4079 (bfd *output_bfd ATTRIBUTE_UNUSED,
4080 struct bfd_link_info *info,
4081 void *flaginfo ATTRIBUTE_UNUSED,
4082 int (*func) (void *, const char *,
4083 Elf_Internal_Sym *,
4084 asection *,
4085 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4086 {
4087 struct elf_x86_link_hash_table *htab
4088 = elf_x86_hash_table (info, I386_ELF_DATA);
4089 if (htab == NULL)
4090 return FALSE;
4091
4092 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4093 htab_traverse (htab->loc_hash_table,
4094 elf_i386_finish_local_dynamic_symbol,
4095 info);
4096
4097 return TRUE;
4098 }
4099
4100 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4101 dynamic relocations. */
4102
4103 static long
4104 elf_i386_get_synthetic_symtab (bfd *abfd,
4105 long symcount ATTRIBUTE_UNUSED,
4106 asymbol **syms ATTRIBUTE_UNUSED,
4107 long dynsymcount,
4108 asymbol **dynsyms,
4109 asymbol **ret)
4110 {
4111 long count, i, n;
4112 int j;
4113 bfd_byte *plt_contents;
4114 long relsize;
4115 const struct elf_x86_lazy_plt_layout *lazy_plt;
4116 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4117 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4118 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4119 asection *plt;
4120 bfd_vma got_addr;
4121 enum elf_x86_plt_type plt_type;
4122 struct elf_x86_plt plts[] =
4123 {
4124 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4125 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4126 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4127 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4128 };
4129
4130 *ret = NULL;
4131
4132 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4133 return 0;
4134
4135 if (dynsymcount <= 0)
4136 return 0;
4137
4138 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4139 if (relsize <= 0)
4140 return -1;
4141
4142 non_lazy_plt = NULL;
4143 /* Silence GCC 6. */
4144 lazy_plt = NULL;
4145 non_lazy_ibt_plt = NULL;
4146 lazy_ibt_plt = NULL;
4147 switch (get_elf_backend_data (abfd)->target_os)
4148 {
4149 case is_normal:
4150 case is_solaris:
4151 non_lazy_plt = &elf_i386_non_lazy_plt;
4152 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4153 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4154 /* Fall through */
4155 case is_vxworks:
4156 lazy_plt = &elf_i386_lazy_plt;
4157 break;
4158 default:
4159 abort ();
4160 }
4161
4162 got_addr = 0;
4163
4164 count = 0;
4165 for (j = 0; plts[j].name != NULL; j++)
4166 {
4167 plt = bfd_get_section_by_name (abfd, plts[j].name);
4168 if (plt == NULL || plt->size == 0)
4169 continue;
4170
4171 /* Get the PLT section contents. */
4172 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4173 if (plt_contents == NULL)
4174 break;
4175 if (!bfd_get_section_contents (abfd, (asection *) plt,
4176 plt_contents, 0, plt->size))
4177 {
4178 free (plt_contents);
4179 break;
4180 }
4181
4182 /* Check what kind of PLT it is. */
4183 plt_type = plt_unknown;
4184 if (plts[j].type == plt_unknown
4185 && (plt->size >= (lazy_plt->plt0_entry_size
4186 + lazy_plt->plt_entry_size)))
4187 {
4188 /* Match lazy PLT first. */
4189 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4190 lazy_plt->plt0_got1_offset) == 0)
4191 {
4192 /* The fist entry in the lazy IBT PLT is the same as the
4193 normal lazy PLT. */
4194 if (lazy_ibt_plt != NULL
4195 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4196 lazy_ibt_plt->plt_entry,
4197 lazy_ibt_plt->plt_got_offset) == 0))
4198 plt_type = plt_lazy | plt_second;
4199 else
4200 plt_type = plt_lazy;
4201 }
4202 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4203 lazy_plt->plt0_got1_offset) == 0)
4204 {
4205 /* The fist entry in the PIC lazy IBT PLT is the same as
4206 the normal PIC lazy PLT. */
4207 if (lazy_ibt_plt != NULL
4208 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4209 lazy_ibt_plt->pic_plt_entry,
4210 lazy_ibt_plt->plt_got_offset) == 0))
4211 plt_type = plt_lazy | plt_pic | plt_second;
4212 else
4213 plt_type = plt_lazy | plt_pic;
4214 }
4215 }
4216
4217 if (non_lazy_plt != NULL
4218 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4219 && plt->size >= non_lazy_plt->plt_entry_size)
4220 {
4221 /* Match non-lazy PLT. */
4222 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4223 non_lazy_plt->plt_got_offset) == 0)
4224 plt_type = plt_non_lazy;
4225 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4226 non_lazy_plt->plt_got_offset) == 0)
4227 plt_type = plt_pic;
4228 }
4229
4230 if ((non_lazy_ibt_plt != NULL)
4231 && (plt_type == plt_unknown || plt_type == plt_second)
4232 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4233 {
4234 if (memcmp (plt_contents,
4235 non_lazy_ibt_plt->plt_entry,
4236 non_lazy_ibt_plt->plt_got_offset) == 0)
4237 {
4238 /* Match IBT PLT. */
4239 plt_type = plt_second;
4240 non_lazy_plt = non_lazy_ibt_plt;
4241 }
4242 else if (memcmp (plt_contents,
4243 non_lazy_ibt_plt->pic_plt_entry,
4244 non_lazy_ibt_plt->plt_got_offset) == 0)
4245 {
4246 /* Match PIC IBT PLT. */
4247 plt_type = plt_second | plt_pic;
4248 non_lazy_plt = non_lazy_ibt_plt;
4249 }
4250 }
4251
4252 if (plt_type == plt_unknown)
4253 {
4254 free (plt_contents);
4255 continue;
4256 }
4257
4258 plts[j].sec = plt;
4259 plts[j].type = plt_type;
4260
4261 if ((plt_type & plt_lazy))
4262 {
4263 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4264 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4265 /* Skip PLT0 in lazy PLT. */
4266 i = 1;
4267 }
4268 else
4269 {
4270 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4271 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4272 i = 0;
4273 }
4274
4275 /* Skip lazy PLT when the second PLT is used. */
4276 if ((plt_type & (plt_lazy | plt_second))
4277 == (plt_lazy | plt_second))
4278 plts[j].count = 0;
4279 else
4280 {
4281 n = plt->size / plts[j].plt_entry_size;
4282 plts[j].count = n;
4283 count += n - i;
4284 }
4285
4286 plts[j].contents = plt_contents;
4287
4288 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4289 if ((plt_type & plt_pic))
4290 got_addr = (bfd_vma) -1;
4291 }
4292
4293 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4294 got_addr, plts, dynsyms,
4295 ret);
4296 }
4297
4298 /* Set up i386 GNU properties. Return the first relocatable ELF input
4299 with GNU properties if found. Otherwise, return NULL. */
4300
4301 static bfd *
4302 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4303 {
4304 struct elf_x86_init_table init_table;
4305
4306 switch (get_elf_backend_data (info->output_bfd)->target_os)
4307 {
4308 case is_normal:
4309 case is_solaris:
4310 init_table.plt0_pad_byte = 0x0;
4311 init_table.lazy_plt = &elf_i386_lazy_plt;
4312 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4313 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4314 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4315 break;
4316 case is_vxworks:
4317 init_table.plt0_pad_byte = 0x90;
4318 init_table.lazy_plt = &elf_i386_lazy_plt;
4319 init_table.non_lazy_plt = NULL;
4320 init_table.lazy_ibt_plt = NULL;
4321 init_table.non_lazy_ibt_plt = NULL;
4322 break;
4323 default:
4324 abort ();
4325 }
4326
4327 init_table.r_info = elf32_r_info;
4328 init_table.r_sym = elf32_r_sym;
4329
4330 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4331 }
4332
4333 #define TARGET_LITTLE_SYM i386_elf32_vec
4334 #define TARGET_LITTLE_NAME "elf32-i386"
4335 #define ELF_ARCH bfd_arch_i386
4336 #define ELF_TARGET_ID I386_ELF_DATA
4337 #define ELF_MACHINE_CODE EM_386
4338 #define ELF_MAXPAGESIZE 0x1000
4339
4340 #define elf_backend_can_gc_sections 1
4341 #define elf_backend_can_refcount 1
4342 #define elf_backend_want_got_plt 1
4343 #define elf_backend_plt_readonly 1
4344 #define elf_backend_want_plt_sym 0
4345 #define elf_backend_got_header_size 12
4346 #define elf_backend_plt_alignment 4
4347 #define elf_backend_dtrel_excludes_plt 1
4348 #define elf_backend_extern_protected_data 1
4349 #define elf_backend_caches_rawsize 1
4350 #define elf_backend_want_dynrelro 1
4351
4352 /* Support RELA for objdump of prelink objects. */
4353 #define elf_info_to_howto elf_i386_info_to_howto_rel
4354 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4355
4356 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4357 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4358 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4359 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4360
4361 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4362 #define elf_backend_check_relocs elf_i386_check_relocs
4363 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4364 #define elf_backend_fake_sections elf_i386_fake_sections
4365 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4366 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4367 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4368 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4369 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4370 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4371 #define elf_backend_relocate_section elf_i386_relocate_section
4372 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4373 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4374
4375 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4376
4377 #define elf32_bed elf32_i386_bed
4378
4379 #include "elf32-target.h"
4380
4381 /* FreeBSD support. */
4382
4383 #undef TARGET_LITTLE_SYM
4384 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4385 #undef TARGET_LITTLE_NAME
4386 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4387 #undef ELF_OSABI
4388 #define ELF_OSABI ELFOSABI_FREEBSD
4389
4390 /* The kernel recognizes executables as valid only if they carry a
4391 "FreeBSD" label in the ELF header. So we put this label on all
4392 executables and (for simplicity) also all other object files. */
4393
4394 static bfd_boolean
4395 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4396 {
4397 if (!_bfd_elf_init_file_header (abfd, info))
4398 return FALSE;
4399
4400 #ifdef OLD_FREEBSD_ABI_LABEL
4401 {
4402 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4403 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4404 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4405 }
4406 #endif
4407 return TRUE;
4408 }
4409
4410 #undef elf_backend_init_file_header
4411 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4412 #undef elf32_bed
4413 #define elf32_bed elf32_i386_fbsd_bed
4414
4415 #undef elf_backend_add_symbol_hook
4416
4417 #include "elf32-target.h"
4418
4419 #undef elf_backend_init_file_header
4420
4421 /* Solaris 2. */
4422
4423 #undef TARGET_LITTLE_SYM
4424 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4425 #undef TARGET_LITTLE_NAME
4426 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4427
4428 #undef ELF_TARGET_OS
4429 #define ELF_TARGET_OS is_solaris
4430
4431 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4432 objects won't be recognized. */
4433 #undef ELF_OSABI
4434
4435 #undef elf32_bed
4436 #define elf32_bed elf32_i386_sol2_bed
4437
4438 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4439 boundary. */
4440 #undef elf_backend_static_tls_alignment
4441 #define elf_backend_static_tls_alignment 8
4442
4443 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4444
4445 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4446 File, p.63. */
4447 #undef elf_backend_want_plt_sym
4448 #define elf_backend_want_plt_sym 1
4449
4450 #undef elf_backend_strtab_flags
4451 #define elf_backend_strtab_flags SHF_STRINGS
4452
4453 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4454 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4455 FALSE otherwise. ISECTION is the best guess matching section from the
4456 input bfd IBFD, but it might be NULL. */
4457
4458 static bfd_boolean
4459 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4460 bfd *obfd ATTRIBUTE_UNUSED,
4461 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4462 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4463 {
4464 /* PR 19938: FIXME: Need to add code for setting the sh_info
4465 and sh_link fields of Solaris specific section types. */
4466 return FALSE;
4467
4468 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4469 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4470
4471 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4472
4473 The following values should be set:
4474
4475 Type Link Info
4476 -----------------------------------------------------------------------------
4477 SHT_SUNW_ancillary The section header index of 0
4478 [0x6fffffee] the associated string table.
4479
4480 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4481 [0x6ffffff0] the associated symbol table. section header index of
4482 the associated
4483 SHT_SUNW_capchain table,
4484 otherwise 0.
4485
4486 SHT_SUNW_symsort The section header index of 0
4487 [0x6ffffff1] the associated symbol table.
4488
4489 SHT_SUNW_tlssort The section header index of 0
4490 [0x6ffffff2] the associated symbol table.
4491
4492 SHT_SUNW_LDYNSYM The section header index of One greater than the
4493 [0x6ffffff3] the associated string table. symbol table index of the
4494 This index is the same string last local symbol,
4495 table used by the SHT_DYNSYM STB_LOCAL. Since
4496 section. SHT_SUNW_LDYNSYM only
4497 contains local symbols,
4498 sh_info is equivalent to
4499 the number of symbols in
4500 the table.
4501
4502 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4503 [0x6ffffff5] the section header index of to named strings, the
4504 the associated section header index of
4505 SHT_SUNW_capinfo table, the associated string
4506 otherwise 0. table, otherwise 0.
4507
4508 SHT_SUNW_move The section header index of 0
4509 [0x6ffffffa] the associated symbol table.
4510
4511 SHT_SUNW_COMDAT 0 0
4512 [0x6ffffffb]
4513
4514 SHT_SUNW_syminfo The section header index of The section header index
4515 [0x6ffffffc] the associated symbol table. of the associated
4516 .dynamic section.
4517
4518 SHT_SUNW_verdef The section header index of The number of version
4519 [0x6ffffffd] the associated string table. definitions within the
4520 section.
4521
4522 SHT_SUNW_verneed The section header index of The number of version
4523 [0x6ffffffe] the associated string table. dependencies within the
4524 section.
4525
4526 SHT_SUNW_versym The section header index of 0
4527 [0x6fffffff] the associated symbol table. */
4528 }
4529
4530 #undef elf_backend_copy_special_section_fields
4531 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4532
4533 #include "elf32-target.h"
4534
4535 /* Intel MCU support. */
4536
4537 static bfd_boolean
4538 elf32_iamcu_elf_object_p (bfd *abfd)
4539 {
4540 /* Set the right machine number for an IAMCU elf32 file. */
4541 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4542 return TRUE;
4543 }
4544
4545 #undef TARGET_LITTLE_SYM
4546 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4547 #undef TARGET_LITTLE_NAME
4548 #define TARGET_LITTLE_NAME "elf32-iamcu"
4549 #undef ELF_ARCH
4550 #define ELF_ARCH bfd_arch_iamcu
4551
4552 #undef ELF_MACHINE_CODE
4553 #define ELF_MACHINE_CODE EM_IAMCU
4554
4555 #undef ELF_TARGET_OS
4556 #undef ELF_OSABI
4557
4558 #undef elf32_bed
4559 #define elf32_bed elf32_iamcu_bed
4560
4561 #undef elf_backend_object_p
4562 #define elf_backend_object_p elf32_iamcu_elf_object_p
4563
4564 #undef elf_backend_static_tls_alignment
4565
4566 #undef elf_backend_want_plt_sym
4567 #define elf_backend_want_plt_sym 0
4568
4569 #undef elf_backend_strtab_flags
4570 #undef elf_backend_copy_special_section_fields
4571
4572 #include "elf32-target.h"
4573
4574 /* Restore defaults. */
4575 #undef ELF_ARCH
4576 #define ELF_ARCH bfd_arch_i386
4577 #undef ELF_MACHINE_CODE
4578 #define ELF_MACHINE_CODE EM_386
4579 #undef elf_backend_object_p
4580
4581 /* VxWorks support. */
4582
4583 #undef TARGET_LITTLE_SYM
4584 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4585 #undef TARGET_LITTLE_NAME
4586 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4587 #undef ELF_OSABI
4588 #undef ELF_MAXPAGESIZE
4589 #define ELF_MAXPAGESIZE 0x1000
4590 #undef elf_backend_plt_alignment
4591 #define elf_backend_plt_alignment 4
4592
4593 #undef ELF_TARGET_OS
4594 #define ELF_TARGET_OS is_vxworks
4595
4596 #undef elf_backend_relocs_compatible
4597 #undef elf_backend_add_symbol_hook
4598 #define elf_backend_add_symbol_hook \
4599 elf_vxworks_add_symbol_hook
4600 #undef elf_backend_link_output_symbol_hook
4601 #define elf_backend_link_output_symbol_hook \
4602 elf_vxworks_link_output_symbol_hook
4603 #undef elf_backend_emit_relocs
4604 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4605 #undef elf_backend_final_write_processing
4606 #define elf_backend_final_write_processing \
4607 elf_vxworks_final_write_processing
4608 #undef elf_backend_static_tls_alignment
4609
4610 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4611 define it. */
4612 #undef elf_backend_want_plt_sym
4613 #define elf_backend_want_plt_sym 1
4614
4615 #undef elf32_bed
4616 #define elf32_bed elf32_i386_vxworks_bed
4617
4618 #include "elf32-target.h"
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