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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2019 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-nacl.h"
23 #include "elf-vxworks.h"
24 #include "dwarf2.h"
25 #include "opcode/i386.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
186
187 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
188
189 #ifdef DEBUG_GEN_RELOC
190 #define TRACE(str) \
191 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 #else
193 #define TRACE(str)
194 #endif
195
196 static reloc_howto_type *
197 elf_i386_reloc_type_lookup (bfd *abfd,
198 bfd_reloc_code_real_type code)
199 {
200 switch (code)
201 {
202 case BFD_RELOC_NONE:
203 TRACE ("BFD_RELOC_NONE");
204 return &elf_howto_table[R_386_NONE];
205
206 case BFD_RELOC_32:
207 TRACE ("BFD_RELOC_32");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_CTOR:
211 TRACE ("BFD_RELOC_CTOR");
212 return &elf_howto_table[R_386_32];
213
214 case BFD_RELOC_32_PCREL:
215 TRACE ("BFD_RELOC_PC32");
216 return &elf_howto_table[R_386_PC32];
217
218 case BFD_RELOC_386_GOT32:
219 TRACE ("BFD_RELOC_386_GOT32");
220 return &elf_howto_table[R_386_GOT32];
221
222 case BFD_RELOC_386_PLT32:
223 TRACE ("BFD_RELOC_386_PLT32");
224 return &elf_howto_table[R_386_PLT32];
225
226 case BFD_RELOC_386_COPY:
227 TRACE ("BFD_RELOC_386_COPY");
228 return &elf_howto_table[R_386_COPY];
229
230 case BFD_RELOC_386_GLOB_DAT:
231 TRACE ("BFD_RELOC_386_GLOB_DAT");
232 return &elf_howto_table[R_386_GLOB_DAT];
233
234 case BFD_RELOC_386_JUMP_SLOT:
235 TRACE ("BFD_RELOC_386_JUMP_SLOT");
236 return &elf_howto_table[R_386_JUMP_SLOT];
237
238 case BFD_RELOC_386_RELATIVE:
239 TRACE ("BFD_RELOC_386_RELATIVE");
240 return &elf_howto_table[R_386_RELATIVE];
241
242 case BFD_RELOC_386_GOTOFF:
243 TRACE ("BFD_RELOC_386_GOTOFF");
244 return &elf_howto_table[R_386_GOTOFF];
245
246 case BFD_RELOC_386_GOTPC:
247 TRACE ("BFD_RELOC_386_GOTPC");
248 return &elf_howto_table[R_386_GOTPC];
249
250 /* These relocs are a GNU extension. */
251 case BFD_RELOC_386_TLS_TPOFF:
252 TRACE ("BFD_RELOC_386_TLS_TPOFF");
253 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_IE:
256 TRACE ("BFD_RELOC_386_TLS_IE");
257 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_GOTIE:
260 TRACE ("BFD_RELOC_386_TLS_GOTIE");
261 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_LE:
264 TRACE ("BFD_RELOC_386_TLS_LE");
265 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_GD:
268 TRACE ("BFD_RELOC_386_TLS_GD");
269 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
270
271 case BFD_RELOC_386_TLS_LDM:
272 TRACE ("BFD_RELOC_386_TLS_LDM");
273 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
274
275 case BFD_RELOC_16:
276 TRACE ("BFD_RELOC_16");
277 return &elf_howto_table[R_386_16 - R_386_ext_offset];
278
279 case BFD_RELOC_16_PCREL:
280 TRACE ("BFD_RELOC_16_PCREL");
281 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
282
283 case BFD_RELOC_8:
284 TRACE ("BFD_RELOC_8");
285 return &elf_howto_table[R_386_8 - R_386_ext_offset];
286
287 case BFD_RELOC_8_PCREL:
288 TRACE ("BFD_RELOC_8_PCREL");
289 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
290
291 /* Common with Sun TLS implementation. */
292 case BFD_RELOC_386_TLS_LDO_32:
293 TRACE ("BFD_RELOC_386_TLS_LDO_32");
294 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_IE_32:
297 TRACE ("BFD_RELOC_386_TLS_IE_32");
298 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_LE_32:
301 TRACE ("BFD_RELOC_386_TLS_LE_32");
302 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPMOD32:
305 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
306 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_DTPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
310 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_TPOFF32:
313 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
314 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
315
316 case BFD_RELOC_SIZE32:
317 TRACE ("BFD_RELOC_SIZE32");
318 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_GOTDESC:
321 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
322 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_TLS_DESC_CALL:
325 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
326 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
327
328 case BFD_RELOC_386_TLS_DESC:
329 TRACE ("BFD_RELOC_386_TLS_DESC");
330 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
331
332 case BFD_RELOC_386_IRELATIVE:
333 TRACE ("BFD_RELOC_386_IRELATIVE");
334 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
335
336 case BFD_RELOC_386_GOT32X:
337 TRACE ("BFD_RELOC_386_GOT32X");
338 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
339
340 case BFD_RELOC_VTABLE_INHERIT:
341 TRACE ("BFD_RELOC_VTABLE_INHERIT");
342 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
343
344 case BFD_RELOC_VTABLE_ENTRY:
345 TRACE ("BFD_RELOC_VTABLE_ENTRY");
346 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
347
348 default:
349 TRACE ("Unknown");
350 /* xgettext:c-format */
351 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
352 abfd, (int) code);
353 bfd_set_error (bfd_error_bad_value);
354 return NULL;
355 }
356 }
357
358 static reloc_howto_type *
359 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
360 const char *r_name)
361 {
362 unsigned int i;
363
364 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
365 if (elf_howto_table[i].name != NULL
366 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
367 return &elf_howto_table[i];
368
369 return NULL;
370 }
371
372 static reloc_howto_type *
373 elf_i386_rtype_to_howto (unsigned r_type)
374 {
375 unsigned int indx;
376
377 if ((indx = r_type) >= R_386_standard
378 && ((indx = r_type - R_386_ext_offset) - R_386_standard
379 >= R_386_ext - R_386_standard)
380 && ((indx = r_type - R_386_tls_offset) - R_386_ext
381 >= R_386_ext2 - R_386_ext)
382 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
383 >= R_386_vt - R_386_ext2))
384 return NULL;
385 /* PR 17512: file: 0f67f69d. */
386 if (elf_howto_table [indx].type != r_type)
387 return NULL;
388 return &elf_howto_table[indx];
389 }
390
391 static bfd_boolean
392 elf_i386_info_to_howto_rel (bfd *abfd,
393 arelent *cache_ptr,
394 Elf_Internal_Rela *dst)
395 {
396 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
397
398 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
399 {
400 /* xgettext:c-format */
401 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
402 abfd, r_type);
403 bfd_set_error (bfd_error_bad_value);
404 return FALSE;
405 }
406
407 return TRUE;
408 }
409
410 /* Return whether a symbol name implies a local label. The UnixWare
411 2.1 cc generates temporary symbols that start with .X, so we
412 recognize them here. FIXME: do other SVR4 compilers also use .X?.
413 If so, we should move the .X recognition into
414 _bfd_elf_is_local_label_name. */
415
416 static bfd_boolean
417 elf_i386_is_local_label_name (bfd *abfd, const char *name)
418 {
419 if (name[0] == '.' && name[1] == 'X')
420 return TRUE;
421
422 return _bfd_elf_is_local_label_name (abfd, name);
423 }
424 \f
425 /* Support for core dump NOTE sections. */
426
427 static bfd_boolean
428 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
429 {
430 int offset;
431 size_t size;
432
433 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
434 {
435 int pr_version = bfd_get_32 (abfd, note->descdata);
436
437 if (pr_version != 1)
438 return FALSE;
439
440 /* pr_cursig */
441 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
442
443 /* pr_pid */
444 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
445
446 /* pr_reg */
447 offset = 28;
448 size = bfd_get_32 (abfd, note->descdata + 8);
449 }
450 else
451 {
452 switch (note->descsz)
453 {
454 default:
455 return FALSE;
456
457 case 144: /* Linux/i386 */
458 /* pr_cursig */
459 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
460
461 /* pr_pid */
462 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
463
464 /* pr_reg */
465 offset = 72;
466 size = 68;
467
468 break;
469 }
470 }
471
472 /* Make a ".reg/999" section. */
473 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
474 size, note->descpos + offset);
475 }
476
477 static bfd_boolean
478 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
479 {
480 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
481 {
482 int pr_version = bfd_get_32 (abfd, note->descdata);
483
484 if (pr_version != 1)
485 return FALSE;
486
487 elf_tdata (abfd)->core->program
488 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
489 elf_tdata (abfd)->core->command
490 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
491 }
492 else
493 {
494 switch (note->descsz)
495 {
496 default:
497 return FALSE;
498
499 case 124: /* Linux/i386 elf_prpsinfo. */
500 elf_tdata (abfd)->core->pid
501 = bfd_get_32 (abfd, note->descdata + 12);
502 elf_tdata (abfd)->core->program
503 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
504 elf_tdata (abfd)->core->command
505 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
506 }
507 }
508
509 /* Note that for some reason, a spurious space is tacked
510 onto the end of the args in some (at least one anyway)
511 implementations, so strip it off if it exists. */
512 {
513 char *command = elf_tdata (abfd)->core->command;
514 int n = strlen (command);
515
516 if (0 < n && command[n - 1] == ' ')
517 command[n - 1] = '\0';
518 }
519
520 return TRUE;
521 }
522 \f
523 /* Functions for the i386 ELF linker.
524
525 In order to gain some understanding of code in this file without
526 knowing all the intricate details of the linker, note the
527 following:
528
529 Functions named elf_i386_* are called by external routines, other
530 functions are only called locally. elf_i386_* functions appear
531 in this file more or less in the order in which they are called
532 from external routines. eg. elf_i386_check_relocs is called
533 early in the link process, elf_i386_finish_dynamic_sections is
534 one of the last functions. */
535
536 /* The size in bytes of an entry in the lazy procedure linkage table. */
537
538 #define LAZY_PLT_ENTRY_SIZE 16
539
540 /* The size in bytes of an entry in the non-lazy procedure linkage
541 table. */
542
543 #define NON_LAZY_PLT_ENTRY_SIZE 8
544
545 /* The first entry in an absolute lazy procedure linkage table looks
546 like this. See the SVR4 ABI i386 supplement to see how this works.
547 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
548
549 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
550 {
551 0xff, 0x35, /* pushl contents of address */
552 0, 0, 0, 0, /* replaced with address of .got + 4. */
553 0xff, 0x25, /* jmp indirect */
554 0, 0, 0, 0 /* replaced with address of .got + 8. */
555 };
556
557 /* Subsequent entries in an absolute lazy procedure linkage table look
558 like this. */
559
560 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
561 {
562 0xff, 0x25, /* jmp indirect */
563 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
564 0x68, /* pushl immediate */
565 0, 0, 0, 0, /* replaced with offset into relocation table. */
566 0xe9, /* jmp relative */
567 0, 0, 0, 0 /* replaced with offset to start of .plt. */
568 };
569
570 /* The first entry in a PIC lazy procedure linkage table look like
571 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
572 lazy_plt->plt0_pad_byte. */
573
574 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
575 {
576 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
577 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
578 };
579
580 /* Subsequent entries in a PIC lazy procedure linkage table look like
581 this. */
582
583 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
584 {
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
591 };
592
593 /* Entries in the non-lazy procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
596 {
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
600 };
601
602 /* Entries in the PIC non-lazy procedure linkage table look like
603 this. */
604
605 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
606 {
607 0xff, 0xa3, /* jmp *offset(%ebx) */
608 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610 };
611
612 /* The first entry in an absolute IBT-enabled lazy procedure linkage
613 table looks like this. */
614
615 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
616 {
617 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
618 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
619 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
620 };
621
622 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
623 table look like this. Subsequent entries for a PIC IBT-enabled lazy
624 procedure linkage table are the same. */
625
626 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
627 {
628 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
629 0x68, 0, 0, 0, 0, /* pushl immediate */
630 0xe9, 0, 0, 0, 0, /* jmp relative */
631 0x66, 0x90 /* xchg %ax,%ax */
632 };
633
634 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
635 look like. */
636
637 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
638 {
639 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
640 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
641 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
642 };
643
644 /* Entries for branches with IBT-enabled in the absolute non-lazey
645 procedure linkage table look like this. They have the same size
646 as the lazy PLT entry. */
647
648 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
649 {
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
653 };
654
655 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
656 linkage table look like this. They have the same size as the lazy
657 PLT entry. */
658
659 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
660 {
661 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
662 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
663 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
664 };
665
666 /* .eh_frame covering the lazy .plt section. */
667
668 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
669 {
670 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
671 0, 0, 0, 0, /* CIE ID */
672 1, /* CIE version */
673 'z', 'R', 0, /* Augmentation string */
674 1, /* Code alignment factor */
675 0x7c, /* Data alignment factor */
676 8, /* Return address column */
677 1, /* Augmentation size */
678 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
679 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
680 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
681 DW_CFA_nop, DW_CFA_nop,
682
683 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
684 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
685 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
686 0, 0, 0, 0, /* .plt size goes here */
687 0, /* Augmentation size */
688 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
689 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
690 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
691 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
692 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
693 11, /* Block length */
694 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
695 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
696 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
697 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
698 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
699 };
700
701 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
702
703 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
704 {
705 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
706 0, 0, 0, 0, /* CIE ID */
707 1, /* CIE version */
708 'z', 'R', 0, /* Augmentation string */
709 1, /* Code alignment factor */
710 0x7c, /* Data alignment factor */
711 8, /* Return address column */
712 1, /* Augmentation size */
713 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
714 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
715 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
716 DW_CFA_nop, DW_CFA_nop,
717
718 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
719 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
720 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
721 0, 0, 0, 0, /* .plt size goes here */
722 0, /* Augmentation size */
723 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
724 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
725 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
726 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
727 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
728 11, /* Block length */
729 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
730 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
731 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
732 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
733 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
734 };
735
736 /* .eh_frame covering the non-lazy .plt section. */
737
738 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
739 {
740 #define PLT_GOT_FDE_LENGTH 16
741 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
742 0, 0, 0, 0, /* CIE ID */
743 1, /* CIE version */
744 'z', 'R', 0, /* Augmentation string */
745 1, /* Code alignment factor */
746 0x7c, /* Data alignment factor */
747 8, /* Return address column */
748 1, /* Augmentation size */
749 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
750 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
751 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
752 DW_CFA_nop, DW_CFA_nop,
753
754 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
755 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
756 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
757 0, 0, 0, 0, /* non-lazy .plt size goes here */
758 0, /* Augmentation size */
759 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
760 };
761
762 /* These are the standard parameters. */
763 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
764 {
765 elf_i386_lazy_plt0_entry, /* plt0_entry */
766 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
767 elf_i386_lazy_plt_entry, /* plt_entry */
768 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
769 NULL, /* plt_tlsdesc_entry */
770 0, /* plt_tlsdesc_entry_size*/
771 0, /* plt_tlsdesc_got1_offset */
772 0, /* plt_tlsdesc_got2_offset */
773 0, /* plt_tlsdesc_got1_insn_end */
774 0, /* plt_tlsdesc_got2_insn_end */
775 2, /* plt0_got1_offset */
776 8, /* plt0_got2_offset */
777 0, /* plt0_got2_insn_end */
778 2, /* plt_got_offset */
779 7, /* plt_reloc_offset */
780 12, /* plt_plt_offset */
781 0, /* plt_got_insn_size */
782 0, /* plt_plt_insn_end */
783 6, /* plt_lazy_offset */
784 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
785 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
786 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
787 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
788 };
789
790 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
791 {
792 elf_i386_non_lazy_plt_entry, /* plt_entry */
793 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
794 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
795 2, /* plt_got_offset */
796 0, /* plt_got_insn_size */
797 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
798 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
799 };
800
801 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
802 {
803 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
804 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
805 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
806 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
807 NULL, /* plt_tlsdesc_entry */
808 0, /* plt_tlsdesc_entry_size*/
809 0, /* plt_tlsdesc_got1_offset */
810 0, /* plt_tlsdesc_got2_offset */
811 0, /* plt_tlsdesc_got1_insn_end */
812 0, /* plt_tlsdesc_got2_insn_end */
813 2, /* plt0_got1_offset */
814 8, /* plt0_got2_offset */
815 0, /* plt0_got2_insn_end */
816 4+2, /* plt_got_offset */
817 4+1, /* plt_reloc_offset */
818 4+6, /* plt_plt_offset */
819 0, /* plt_got_insn_size */
820 0, /* plt_plt_insn_end */
821 0, /* plt_lazy_offset */
822 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
823 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
824 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
825 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
826 };
827
828 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
829 {
830 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
831 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
832 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
833 4+2, /* plt_got_offset */
834 0, /* plt_got_insn_size */
835 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
836 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
837 };
838 \f
839
840 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
841 for the PLTResolve stub and then for each PLT entry. */
842 #define PLTRESOLVE_RELOCS_SHLIB 0
843 #define PLTRESOLVE_RELOCS 2
844 #define PLT_NON_JUMP_SLOT_RELOCS 2
845
846 /* These are the standard parameters. */
847 static const struct elf_x86_backend_data elf_i386_arch_bed =
848 {
849 is_normal /* os */
850 };
851
852 #define elf_backend_arch_data &elf_i386_arch_bed
853
854 /* Return TRUE if the TLS access code sequence support transition
855 from R_TYPE. */
856
857 static bfd_boolean
858 elf_i386_check_tls_transition (asection *sec,
859 bfd_byte *contents,
860 Elf_Internal_Shdr *symtab_hdr,
861 struct elf_link_hash_entry **sym_hashes,
862 unsigned int r_type,
863 const Elf_Internal_Rela *rel,
864 const Elf_Internal_Rela *relend)
865 {
866 unsigned int val, type, reg;
867 unsigned long r_symndx;
868 struct elf_link_hash_entry *h;
869 bfd_vma offset;
870 bfd_byte *call;
871 bfd_boolean indirect_call;
872
873 offset = rel->r_offset;
874 switch (r_type)
875 {
876 case R_386_TLS_GD:
877 case R_386_TLS_LDM:
878 if (offset < 2 || (rel + 1) >= relend)
879 return FALSE;
880
881 indirect_call = FALSE;
882 call = contents + offset + 4;
883 val = *(call - 5);
884 type = *(call - 6);
885 if (r_type == R_386_TLS_GD)
886 {
887 /* Check transition from GD access model. Only
888 leal foo@tlsgd(,%ebx,1), %eax
889 call ___tls_get_addr@PLT
890 or
891 leal foo@tlsgd(%ebx) %eax
892 call ___tls_get_addr@PLT
893 nop
894 or
895 leal foo@tlsgd(%reg), %eax
896 call *___tls_get_addr@GOT(%reg)
897 which may be converted to
898 addr32 call ___tls_get_addr
899 can transit to different access model. */
900 if ((offset + 10) > sec->size
901 || (type != 0x8d && type != 0x04))
902 return FALSE;
903
904 if (type == 0x04)
905 {
906 /* leal foo@tlsgd(,%ebx,1), %eax
907 call ___tls_get_addr@PLT */
908 if (offset < 3)
909 return FALSE;
910
911 if (*(call - 7) != 0x8d
912 || val != 0x1d
913 || call[0] != 0xe8)
914 return FALSE;
915 }
916 else
917 {
918 /* This must be
919 leal foo@tlsgd(%ebx), %eax
920 call ___tls_get_addr@PLT
921 nop
922 or
923 leal foo@tlsgd(%reg), %eax
924 call *___tls_get_addr@GOT(%reg)
925 which may be converted to
926 addr32 call ___tls_get_addr
927
928 %eax can't be used as the GOT base register since it
929 is used to pass parameter to ___tls_get_addr. */
930 reg = val & 7;
931 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
932 return FALSE;
933
934 indirect_call = call[0] == 0xff;
935 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
936 && !(call[0] == 0x67 && call[1] == 0xe8)
937 && !(indirect_call
938 && (call[1] & 0xf8) == 0x90
939 && (call[1] & 0x7) == reg))
940 return FALSE;
941 }
942 }
943 else
944 {
945 /* Check transition from LD access model. Only
946 leal foo@tlsldm(%ebx), %eax
947 call ___tls_get_addr@PLT
948 or
949 leal foo@tlsldm(%reg), %eax
950 call *___tls_get_addr@GOT(%reg)
951 which may be converted to
952 addr32 call ___tls_get_addr
953 can transit to different access model. */
954 if (type != 0x8d || (offset + 9) > sec->size)
955 return FALSE;
956
957 /* %eax can't be used as the GOT base register since it is
958 used to pass parameter to ___tls_get_addr. */
959 reg = val & 7;
960 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
961 return FALSE;
962
963 indirect_call = call[0] == 0xff;
964 if (!(reg == 3 && call[0] == 0xe8)
965 && !(call[0] == 0x67 && call[1] == 0xe8)
966 && !(indirect_call
967 && (call[1] & 0xf8) == 0x90
968 && (call[1] & 0x7) == reg))
969 return FALSE;
970 }
971
972 r_symndx = ELF32_R_SYM (rel[1].r_info);
973 if (r_symndx < symtab_hdr->sh_info)
974 return FALSE;
975
976 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
977 if (h == NULL
978 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
979 return FALSE;
980 else if (indirect_call)
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
982 else
983 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
984 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
985
986 case R_386_TLS_IE:
987 /* Check transition from IE access model:
988 movl foo@indntpoff(%rip), %eax
989 movl foo@indntpoff(%rip), %reg
990 addl foo@indntpoff(%rip), %reg
991 */
992
993 if (offset < 1 || (offset + 4) > sec->size)
994 return FALSE;
995
996 /* Check "movl foo@tpoff(%rip), %eax" first. */
997 val = bfd_get_8 (abfd, contents + offset - 1);
998 if (val == 0xa1)
999 return TRUE;
1000
1001 if (offset < 2)
1002 return FALSE;
1003
1004 /* Check movl|addl foo@tpoff(%rip), %reg. */
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return ((type == 0x8b || type == 0x03)
1007 && (val & 0xc7) == 0x05);
1008
1009 case R_386_TLS_GOTIE:
1010 case R_386_TLS_IE_32:
1011 /* Check transition from {IE_32,GOTIE} access model:
1012 subl foo@{tpoff,gontoff}(%reg1), %reg2
1013 movl foo@{tpoff,gontoff}(%reg1), %reg2
1014 addl foo@{tpoff,gontoff}(%reg1), %reg2
1015 */
1016
1017 if (offset < 2 || (offset + 4) > sec->size)
1018 return FALSE;
1019
1020 val = bfd_get_8 (abfd, contents + offset - 1);
1021 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1022 return FALSE;
1023
1024 type = bfd_get_8 (abfd, contents + offset - 2);
1025 return type == 0x8b || type == 0x2b || type == 0x03;
1026
1027 case R_386_TLS_GOTDESC:
1028 /* Check transition from GDesc access model:
1029 leal x@tlsdesc(%ebx), %eax
1030
1031 Make sure it's a leal adding ebx to a 32-bit offset
1032 into any register, although it's probably almost always
1033 going to be eax. */
1034
1035 if (offset < 2 || (offset + 4) > sec->size)
1036 return FALSE;
1037
1038 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1039 return FALSE;
1040
1041 val = bfd_get_8 (abfd, contents + offset - 1);
1042 return (val & 0xc7) == 0x83;
1043
1044 case R_386_TLS_DESC_CALL:
1045 /* Check transition from GDesc access model:
1046 call *x@tlsdesc(%eax)
1047 */
1048 if (offset + 2 <= sec->size)
1049 {
1050 /* Make sure that it's a call *x@tlsdesc(%eax). */
1051 call = contents + offset;
1052 return call[0] == 0xff && call[1] == 0x10;
1053 }
1054
1055 return FALSE;
1056
1057 default:
1058 abort ();
1059 }
1060 }
1061
1062 /* Return TRUE if the TLS access transition is OK or no transition
1063 will be performed. Update R_TYPE if there is a transition. */
1064
1065 static bfd_boolean
1066 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1067 asection *sec, bfd_byte *contents,
1068 Elf_Internal_Shdr *symtab_hdr,
1069 struct elf_link_hash_entry **sym_hashes,
1070 unsigned int *r_type, int tls_type,
1071 const Elf_Internal_Rela *rel,
1072 const Elf_Internal_Rela *relend,
1073 struct elf_link_hash_entry *h,
1074 unsigned long r_symndx,
1075 bfd_boolean from_relocate_section)
1076 {
1077 unsigned int from_type = *r_type;
1078 unsigned int to_type = from_type;
1079 bfd_boolean check = TRUE;
1080
1081 /* Skip TLS transition for functions. */
1082 if (h != NULL
1083 && (h->type == STT_FUNC
1084 || h->type == STT_GNU_IFUNC))
1085 return TRUE;
1086
1087 switch (from_type)
1088 {
1089 case R_386_TLS_GD:
1090 case R_386_TLS_GOTDESC:
1091 case R_386_TLS_DESC_CALL:
1092 case R_386_TLS_IE_32:
1093 case R_386_TLS_IE:
1094 case R_386_TLS_GOTIE:
1095 if (bfd_link_executable (info))
1096 {
1097 if (h == NULL)
1098 to_type = R_386_TLS_LE_32;
1099 else if (from_type != R_386_TLS_IE
1100 && from_type != R_386_TLS_GOTIE)
1101 to_type = R_386_TLS_IE_32;
1102 }
1103
1104 /* When we are called from elf_i386_relocate_section, there may
1105 be additional transitions based on TLS_TYPE. */
1106 if (from_relocate_section)
1107 {
1108 unsigned int new_to_type = to_type;
1109
1110 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1111 new_to_type = R_386_TLS_LE_32;
1112
1113 if (to_type == R_386_TLS_GD
1114 || to_type == R_386_TLS_GOTDESC
1115 || to_type == R_386_TLS_DESC_CALL)
1116 {
1117 if (tls_type == GOT_TLS_IE_POS)
1118 new_to_type = R_386_TLS_GOTIE;
1119 else if (tls_type & GOT_TLS_IE)
1120 new_to_type = R_386_TLS_IE_32;
1121 }
1122
1123 /* We checked the transition before when we were called from
1124 elf_i386_check_relocs. We only want to check the new
1125 transition which hasn't been checked before. */
1126 check = new_to_type != to_type && from_type == to_type;
1127 to_type = new_to_type;
1128 }
1129
1130 break;
1131
1132 case R_386_TLS_LDM:
1133 if (bfd_link_executable (info))
1134 to_type = R_386_TLS_LE_32;
1135 break;
1136
1137 default:
1138 return TRUE;
1139 }
1140
1141 /* Return TRUE if there is no transition. */
1142 if (from_type == to_type)
1143 return TRUE;
1144
1145 /* Check if the transition can be performed. */
1146 if (check
1147 && ! elf_i386_check_tls_transition (sec, contents,
1148 symtab_hdr, sym_hashes,
1149 from_type, rel, relend))
1150 {
1151 reloc_howto_type *from, *to;
1152 const char *name;
1153
1154 from = elf_i386_rtype_to_howto (from_type);
1155 to = elf_i386_rtype_to_howto (to_type);
1156
1157 if (h)
1158 name = h->root.root.string;
1159 else
1160 {
1161 struct elf_x86_link_hash_table *htab;
1162
1163 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1164 if (htab == NULL)
1165 name = "*unknown*";
1166 else
1167 {
1168 Elf_Internal_Sym *isym;
1169
1170 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1171 abfd, r_symndx);
1172 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1173 }
1174 }
1175
1176 _bfd_error_handler
1177 /* xgettext:c-format */
1178 (_("%pB: TLS transition from %s to %s against `%s'"
1179 " at %#" PRIx64 " in section `%pA' failed"),
1180 abfd, from->name, to->name, name,
1181 (uint64_t) rel->r_offset, sec);
1182 bfd_set_error (bfd_error_bad_value);
1183 return FALSE;
1184 }
1185
1186 *r_type = to_type;
1187 return TRUE;
1188 }
1189
1190 /* With the local symbol, foo, we convert
1191 mov foo@GOT[(%reg1)], %reg2
1192 to
1193 lea foo[@GOTOFF(%reg1)], %reg2
1194 and convert
1195 call/jmp *foo@GOT[(%reg)]
1196 to
1197 nop call foo/jmp foo nop
1198 When PIC is false, convert
1199 test %reg1, foo@GOT[(%reg2)]
1200 to
1201 test $foo, %reg1
1202 and convert
1203 binop foo@GOT[(%reg1)], %reg2
1204 to
1205 binop $foo, %reg2
1206 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1207 instructions. */
1208
1209 static
1210 bfd_boolean
1211 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1212 bfd_byte *contents,
1213 unsigned int *r_type_p,
1214 Elf_Internal_Rela *irel,
1215 struct elf_link_hash_entry *h,
1216 bfd_boolean *converted,
1217 struct bfd_link_info *link_info)
1218 {
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1221 unsigned int modrm;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1225 unsigned int nop;
1226 bfd_vma nop_offset;
1227 bfd_boolean is_pic;
1228 bfd_boolean to_reloc_32;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bfd_boolean local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1234
1235 if (roff < 2)
1236 return TRUE;
1237
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1240 if (addend != 0)
1241 return TRUE;
1242
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 is_pic = bfd_link_pic (link_info);
1245
1246 r_type = *r_type_p;
1247 r_symndx = ELF32_R_SYM (irel->r_info);
1248
1249 modrm = bfd_get_8 (abfd, contents + roff - 1);
1250 baseless = (modrm & 0xc7) == 0x5;
1251
1252 if (baseless && is_pic)
1253 {
1254 /* For PIC, disallow R_386_GOT32X without a base register
1255 since we don't know what the GOT base is. */
1256 const char *name;
1257
1258 if (h == NULL)
1259 {
1260 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1261 r_symndx);
1262 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1263 }
1264 else
1265 name = h->root.root.string;
1266
1267 _bfd_error_handler
1268 /* xgettext:c-format */
1269 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1270 " register can not be used when making a shared object"),
1271 abfd, name);
1272 return FALSE;
1273 }
1274
1275 opcode = bfd_get_8 (abfd, contents + roff - 2);
1276
1277 /* Convert to R_386_32 if PIC is false or there is no base
1278 register. */
1279 to_reloc_32 = !is_pic || baseless;
1280
1281 eh = elf_x86_hash_entry (h);
1282
1283 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1284 reloc. */
1285 if (h == NULL)
1286 {
1287 if (opcode == 0x0ff)
1288 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1289 goto convert_branch;
1290 else
1291 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1292 "test %reg1, foo@GOT(%reg2)" and
1293 "binop foo@GOT[(%reg1)], %reg2". */
1294 goto convert_load;
1295 }
1296
1297 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1298 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
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 (to_reloc_32)
1400 {
1401 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1402 "mov $foo, %reg2" with R_386_32. */
1403 r_type = R_386_32;
1404 modrm = 0xc0 | (modrm & 0x38) >> 3;
1405 bfd_put_8 (abfd, modrm, contents + roff - 1);
1406 opcode = 0xc7;
1407 }
1408 else
1409 {
1410 /* Convert "mov foo@GOT(%reg1), %reg2" to
1411 "lea foo@GOTOFF(%reg1), %reg2". */
1412 r_type = R_386_GOTOFF;
1413 opcode = 0x8d;
1414 }
1415 }
1416 else
1417 {
1418 /* Only R_386_32 is supported. */
1419 if (!to_reloc_32)
1420 return TRUE;
1421
1422 if (opcode == 0x85)
1423 {
1424 /* Convert "test %reg1, foo@GOT(%reg2)" to
1425 "test $foo, %reg1". */
1426 modrm = 0xc0 | (modrm & 0x38) >> 3;
1427 opcode = 0xf7;
1428 }
1429 else
1430 {
1431 /* Convert "binop foo@GOT(%reg1), %reg2" to
1432 "binop $foo, %reg2". */
1433 modrm = (0xc0
1434 | (modrm & 0x38) >> 3
1435 | (opcode & 0x3c));
1436 opcode = 0x81;
1437 }
1438 bfd_put_8 (abfd, modrm, contents + roff - 1);
1439 r_type = R_386_32;
1440 }
1441
1442 bfd_put_8 (abfd, opcode, contents + roff - 2);
1443 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1444 *r_type_p = r_type;
1445 *converted = TRUE;
1446 }
1447 }
1448
1449 return TRUE;
1450 }
1451
1452 /* Rename some of the generic section flags to better document how they
1453 are used here. */
1454 #define check_relocs_failed sec_flg0
1455
1456 /* Look through the relocs for a section during the first phase, and
1457 calculate needed space in the global offset table, procedure linkage
1458 table, and dynamic reloc sections. */
1459
1460 static bfd_boolean
1461 elf_i386_check_relocs (bfd *abfd,
1462 struct bfd_link_info *info,
1463 asection *sec,
1464 const Elf_Internal_Rela *relocs)
1465 {
1466 struct elf_x86_link_hash_table *htab;
1467 Elf_Internal_Shdr *symtab_hdr;
1468 struct elf_link_hash_entry **sym_hashes;
1469 const Elf_Internal_Rela *rel;
1470 const Elf_Internal_Rela *rel_end;
1471 asection *sreloc;
1472 bfd_byte *contents;
1473 bfd_boolean converted;
1474
1475 if (bfd_link_relocatable (info))
1476 return TRUE;
1477
1478 /* Don't do anything special with non-loaded, non-alloced sections.
1479 In particular, any relocs in such sections should not affect GOT
1480 and PLT reference counting (ie. we don't allow them to create GOT
1481 or PLT entries), there's no possibility or desire to optimize TLS
1482 relocs, and there's not much point in propagating relocs to shared
1483 libs that the dynamic linker won't relocate. */
1484 if ((sec->flags & SEC_ALLOC) == 0)
1485 return TRUE;
1486
1487 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1488 if (htab == NULL)
1489 {
1490 sec->check_relocs_failed = 1;
1491 return FALSE;
1492 }
1493
1494 BFD_ASSERT (is_x86_elf (abfd, htab));
1495
1496 /* Get the section contents. */
1497 if (elf_section_data (sec)->this_hdr.contents != NULL)
1498 contents = elf_section_data (sec)->this_hdr.contents;
1499 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1500 {
1501 sec->check_relocs_failed = 1;
1502 return FALSE;
1503 }
1504
1505 symtab_hdr = &elf_symtab_hdr (abfd);
1506 sym_hashes = elf_sym_hashes (abfd);
1507
1508 converted = FALSE;
1509
1510 sreloc = NULL;
1511
1512 rel_end = relocs + sec->reloc_count;
1513 for (rel = relocs; rel < rel_end; rel++)
1514 {
1515 unsigned int r_type;
1516 unsigned int r_symndx;
1517 struct elf_link_hash_entry *h;
1518 struct elf_x86_link_hash_entry *eh;
1519 Elf_Internal_Sym *isym;
1520 const char *name;
1521 bfd_boolean size_reloc;
1522
1523 r_symndx = ELF32_R_SYM (rel->r_info);
1524 r_type = ELF32_R_TYPE (rel->r_info);
1525
1526 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1527 {
1528 /* xgettext:c-format */
1529 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1530 abfd, r_symndx);
1531 goto error_return;
1532 }
1533
1534 if (r_symndx < symtab_hdr->sh_info)
1535 {
1536 /* A local symbol. */
1537 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1538 abfd, r_symndx);
1539 if (isym == NULL)
1540 goto error_return;
1541
1542 /* Check relocation against local STT_GNU_IFUNC symbol. */
1543 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1544 {
1545 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1546 if (h == NULL)
1547 goto error_return;
1548
1549 /* Fake a STT_GNU_IFUNC symbol. */
1550 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1551 isym, NULL);
1552 h->type = STT_GNU_IFUNC;
1553 h->def_regular = 1;
1554 h->ref_regular = 1;
1555 h->forced_local = 1;
1556 h->root.type = bfd_link_hash_defined;
1557 }
1558 else
1559 h = NULL;
1560 }
1561 else
1562 {
1563 isym = NULL;
1564 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1565 while (h->root.type == bfd_link_hash_indirect
1566 || h->root.type == bfd_link_hash_warning)
1567 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1568 }
1569
1570 eh = (struct elf_x86_link_hash_entry *) h;
1571 if (h != NULL)
1572 {
1573 if (r_type == R_386_GOTOFF)
1574 eh->gotoff_ref = 1;
1575
1576 /* It is referenced by a non-shared object. */
1577 h->ref_regular = 1;
1578 }
1579
1580 if (r_type == R_386_GOT32X
1581 && (h == NULL || h->type != STT_GNU_IFUNC))
1582 {
1583 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1584 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1585 &r_type, irel, h,
1586 &converted, info))
1587 goto error_return;
1588 }
1589
1590 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1591 symtab_hdr, sym_hashes,
1592 &r_type, GOT_UNKNOWN,
1593 rel, rel_end, h, r_symndx, FALSE))
1594 goto error_return;
1595
1596 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1597 if (h == htab->elf.hgot)
1598 htab->got_referenced = TRUE;
1599
1600 switch (r_type)
1601 {
1602 case R_386_TLS_LDM:
1603 htab->tls_ld_or_ldm_got.refcount = 1;
1604 goto create_got;
1605
1606 case R_386_PLT32:
1607 /* This symbol requires a procedure linkage table entry. We
1608 actually build the entry in adjust_dynamic_symbol,
1609 because this might be a case of linking PIC code which is
1610 never referenced by a dynamic object, in which case we
1611 don't need to generate a procedure linkage table entry
1612 after all. */
1613
1614 /* If this is a local symbol, we resolve it directly without
1615 creating a procedure linkage table entry. */
1616 if (h == NULL)
1617 continue;
1618
1619 eh->zero_undefweak &= 0x2;
1620 h->needs_plt = 1;
1621 h->plt.refcount = 1;
1622 break;
1623
1624 case R_386_SIZE32:
1625 size_reloc = TRUE;
1626 goto do_size;
1627
1628 case R_386_TLS_IE_32:
1629 case R_386_TLS_IE:
1630 case R_386_TLS_GOTIE:
1631 if (!bfd_link_executable (info))
1632 info->flags |= DF_STATIC_TLS;
1633 /* Fall through */
1634
1635 case R_386_GOT32:
1636 case R_386_GOT32X:
1637 case R_386_TLS_GD:
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 /* This symbol requires a global offset table entry. */
1641 {
1642 int tls_type, old_tls_type;
1643
1644 switch (r_type)
1645 {
1646 default:
1647 case R_386_GOT32:
1648 case R_386_GOT32X:
1649 tls_type = GOT_NORMAL;
1650 break;
1651 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1652 case R_386_TLS_GOTDESC:
1653 case R_386_TLS_DESC_CALL:
1654 tls_type = GOT_TLS_GDESC; break;
1655 case R_386_TLS_IE_32:
1656 if (ELF32_R_TYPE (rel->r_info) == r_type)
1657 tls_type = GOT_TLS_IE_NEG;
1658 else
1659 /* If this is a GD->IE transition, we may use either of
1660 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1661 tls_type = GOT_TLS_IE;
1662 break;
1663 case R_386_TLS_IE:
1664 case R_386_TLS_GOTIE:
1665 tls_type = GOT_TLS_IE_POS; break;
1666 }
1667
1668 if (h != NULL)
1669 {
1670 h->got.refcount = 1;
1671 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1672 }
1673 else
1674 {
1675 bfd_signed_vma *local_got_refcounts;
1676
1677 /* This is a global offset table entry for a local symbol. */
1678 local_got_refcounts = elf_local_got_refcounts (abfd);
1679 if (local_got_refcounts == NULL)
1680 {
1681 bfd_size_type size;
1682
1683 size = symtab_hdr->sh_info;
1684 size *= (sizeof (bfd_signed_vma)
1685 + sizeof (bfd_vma) + sizeof(char));
1686 local_got_refcounts = (bfd_signed_vma *)
1687 bfd_zalloc (abfd, size);
1688 if (local_got_refcounts == NULL)
1689 goto error_return;
1690 elf_local_got_refcounts (abfd) = local_got_refcounts;
1691 elf_x86_local_tlsdesc_gotent (abfd)
1692 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1693 elf_x86_local_got_tls_type (abfd)
1694 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1695 }
1696 local_got_refcounts[r_symndx] = 1;
1697 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1698 }
1699
1700 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1701 tls_type |= old_tls_type;
1702 /* If a TLS symbol is accessed using IE at least once,
1703 there is no point to use dynamic model for it. */
1704 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1705 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1706 || (tls_type & GOT_TLS_IE) == 0))
1707 {
1708 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1709 tls_type = old_tls_type;
1710 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1711 && GOT_TLS_GD_ANY_P (tls_type))
1712 tls_type |= old_tls_type;
1713 else
1714 {
1715 if (h)
1716 name = h->root.root.string;
1717 else
1718 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1719 NULL);
1720 _bfd_error_handler
1721 /* xgettext:c-format */
1722 (_("%pB: `%s' accessed both as normal and "
1723 "thread local symbol"),
1724 abfd, name);
1725 bfd_set_error (bfd_error_bad_value);
1726 goto error_return;
1727 }
1728 }
1729
1730 if (old_tls_type != tls_type)
1731 {
1732 if (h != NULL)
1733 elf_x86_hash_entry (h)->tls_type = tls_type;
1734 else
1735 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1736 }
1737 }
1738 /* Fall through */
1739
1740 case R_386_GOTOFF:
1741 case R_386_GOTPC:
1742 create_got:
1743 if (r_type != R_386_TLS_IE)
1744 {
1745 if (eh != NULL)
1746 {
1747 eh->zero_undefweak &= 0x2;
1748
1749 /* Need GOT to resolve undefined weak symbol to 0. */
1750 if (r_type == R_386_GOTOFF
1751 && h->root.type == bfd_link_hash_undefweak
1752 && bfd_link_executable (info))
1753 htab->got_referenced = TRUE;
1754 }
1755 break;
1756 }
1757 /* Fall through */
1758
1759 case R_386_TLS_LE_32:
1760 case R_386_TLS_LE:
1761 if (eh != NULL)
1762 eh->zero_undefweak &= 0x2;
1763 if (bfd_link_executable (info))
1764 break;
1765 info->flags |= DF_STATIC_TLS;
1766 goto do_relocation;
1767
1768 case R_386_32:
1769 case R_386_PC32:
1770 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1771 eh->zero_undefweak |= 0x2;
1772 do_relocation:
1773 /* We are called after all symbols have been resolved. Only
1774 relocation against STT_GNU_IFUNC symbol must go through
1775 PLT. */
1776 if (h != NULL
1777 && (bfd_link_executable (info)
1778 || h->type == STT_GNU_IFUNC))
1779 {
1780 bfd_boolean func_pointer_ref = FALSE;
1781
1782 if (r_type == R_386_PC32)
1783 {
1784 /* Since something like ".long foo - ." may be used
1785 as pointer, make sure that PLT is used if foo is
1786 a function defined in a shared library. */
1787 if ((sec->flags & SEC_CODE) == 0)
1788 h->pointer_equality_needed = 1;
1789 else if (h->type == STT_GNU_IFUNC
1790 && bfd_link_pic (info))
1791 {
1792 _bfd_error_handler
1793 /* xgettext:c-format */
1794 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1795 abfd, h->root.root.string);
1796 bfd_set_error (bfd_error_bad_value);
1797 goto error_return;
1798 }
1799 }
1800 else
1801 {
1802 h->pointer_equality_needed = 1;
1803 /* R_386_32 can be resolved at run-time. */
1804 if (r_type == R_386_32
1805 && (sec->flags & SEC_READONLY) == 0)
1806 func_pointer_ref = TRUE;
1807 }
1808
1809 if (!func_pointer_ref)
1810 {
1811 /* If this reloc is in a read-only section, we might
1812 need a copy reloc. We can't check reliably at this
1813 stage whether the section is read-only, as input
1814 sections have not yet been mapped to output sections.
1815 Tentatively set the flag for now, and correct in
1816 adjust_dynamic_symbol. */
1817 h->non_got_ref = 1;
1818
1819 /* We may need a .plt entry if the symbol is a function
1820 defined in a shared lib or is a function referenced
1821 from the code or read-only section. */
1822 if (!h->def_regular
1823 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1824 h->plt.refcount = 1;
1825 }
1826 }
1827
1828 size_reloc = FALSE;
1829 do_size:
1830 if (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 = &eh->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->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 bfd_size_type 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->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,
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->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->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 /* Forward declaration. */
4101 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4102
4103 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4104 dynamic relocations. */
4105
4106 static long
4107 elf_i386_get_synthetic_symtab (bfd *abfd,
4108 long symcount ATTRIBUTE_UNUSED,
4109 asymbol **syms ATTRIBUTE_UNUSED,
4110 long dynsymcount,
4111 asymbol **dynsyms,
4112 asymbol **ret)
4113 {
4114 long count, i, n;
4115 int j;
4116 bfd_byte *plt_contents;
4117 long relsize;
4118 const struct elf_x86_lazy_plt_layout *lazy_plt;
4119 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4120 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4121 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4122 asection *plt;
4123 bfd_vma got_addr;
4124 enum elf_x86_plt_type plt_type;
4125 struct elf_x86_plt plts[] =
4126 {
4127 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4128 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4129 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4130 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4131 };
4132
4133 *ret = NULL;
4134
4135 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4136 return 0;
4137
4138 if (dynsymcount <= 0)
4139 return 0;
4140
4141 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4142 if (relsize <= 0)
4143 return -1;
4144
4145 non_lazy_plt = NULL;
4146 /* Silence GCC 6. */
4147 lazy_plt = NULL;
4148 non_lazy_ibt_plt = NULL;
4149 lazy_ibt_plt = NULL;
4150 switch (get_elf_x86_backend_data (abfd)->target_os)
4151 {
4152 case is_normal:
4153 case is_solaris:
4154 non_lazy_plt = &elf_i386_non_lazy_plt;
4155 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4156 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4157 /* Fall through */
4158 case is_vxworks:
4159 lazy_plt = &elf_i386_lazy_plt;
4160 break;
4161 case is_nacl:
4162 lazy_plt = &elf_i386_nacl_plt;
4163 break;
4164 }
4165
4166 got_addr = 0;
4167
4168 count = 0;
4169 for (j = 0; plts[j].name != NULL; j++)
4170 {
4171 plt = bfd_get_section_by_name (abfd, plts[j].name);
4172 if (plt == NULL || plt->size == 0)
4173 continue;
4174
4175 /* Get the PLT section contents. */
4176 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4177 if (plt_contents == NULL)
4178 break;
4179 if (!bfd_get_section_contents (abfd, (asection *) plt,
4180 plt_contents, 0, plt->size))
4181 {
4182 free (plt_contents);
4183 break;
4184 }
4185
4186 /* Check what kind of PLT it is. */
4187 plt_type = plt_unknown;
4188 if (plts[j].type == plt_unknown
4189 && (plt->size >= (lazy_plt->plt0_entry_size
4190 + lazy_plt->plt_entry_size)))
4191 {
4192 /* Match lazy PLT first. */
4193 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4194 lazy_plt->plt0_got1_offset) == 0)
4195 {
4196 /* The fist entry in the lazy IBT PLT is the same as the
4197 normal lazy PLT. */
4198 if (lazy_ibt_plt != NULL
4199 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4200 lazy_ibt_plt->plt_entry,
4201 lazy_ibt_plt->plt_got_offset) == 0))
4202 plt_type = plt_lazy | plt_second;
4203 else
4204 plt_type = plt_lazy;
4205 }
4206 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4207 lazy_plt->plt0_got1_offset) == 0)
4208 {
4209 /* The fist entry in the PIC lazy IBT PLT is the same as
4210 the normal PIC lazy PLT. */
4211 if (lazy_ibt_plt != NULL
4212 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4213 lazy_ibt_plt->pic_plt_entry,
4214 lazy_ibt_plt->plt_got_offset) == 0))
4215 plt_type = plt_lazy | plt_pic | plt_second;
4216 else
4217 plt_type = plt_lazy | plt_pic;
4218 }
4219 }
4220
4221 if (non_lazy_plt != NULL
4222 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4223 && plt->size >= non_lazy_plt->plt_entry_size)
4224 {
4225 /* Match non-lazy PLT. */
4226 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4227 non_lazy_plt->plt_got_offset) == 0)
4228 plt_type = plt_non_lazy;
4229 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4230 non_lazy_plt->plt_got_offset) == 0)
4231 plt_type = plt_pic;
4232 }
4233
4234 if ((non_lazy_ibt_plt != NULL)
4235 && (plt_type == plt_unknown || plt_type == plt_second)
4236 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4237 {
4238 if (memcmp (plt_contents,
4239 non_lazy_ibt_plt->plt_entry,
4240 non_lazy_ibt_plt->plt_got_offset) == 0)
4241 {
4242 /* Match IBT PLT. */
4243 plt_type = plt_second;
4244 non_lazy_plt = non_lazy_ibt_plt;
4245 }
4246 else if (memcmp (plt_contents,
4247 non_lazy_ibt_plt->pic_plt_entry,
4248 non_lazy_ibt_plt->plt_got_offset) == 0)
4249 {
4250 /* Match PIC IBT PLT. */
4251 plt_type = plt_second | plt_pic;
4252 non_lazy_plt = non_lazy_ibt_plt;
4253 }
4254 }
4255
4256 if (plt_type == plt_unknown)
4257 {
4258 free (plt_contents);
4259 continue;
4260 }
4261
4262 plts[j].sec = plt;
4263 plts[j].type = plt_type;
4264
4265 if ((plt_type & plt_lazy))
4266 {
4267 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4268 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4269 /* Skip PLT0 in lazy PLT. */
4270 i = 1;
4271 }
4272 else
4273 {
4274 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4275 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4276 i = 0;
4277 }
4278
4279 /* Skip lazy PLT when the second PLT is used. */
4280 if ((plt_type & (plt_lazy | plt_second))
4281 == (plt_lazy | plt_second))
4282 plts[j].count = 0;
4283 else
4284 {
4285 n = plt->size / plts[j].plt_entry_size;
4286 plts[j].count = n;
4287 count += n - i;
4288 }
4289
4290 plts[j].contents = plt_contents;
4291
4292 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4293 if ((plt_type & plt_pic))
4294 got_addr = (bfd_vma) -1;
4295 }
4296
4297 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4298 got_addr, plts, dynsyms,
4299 ret);
4300 }
4301
4302 /* Set up i386 GNU properties. Return the first relocatable ELF input
4303 with GNU properties if found. Otherwise, return NULL. */
4304
4305 static bfd *
4306 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4307 {
4308 struct elf_x86_init_table init_table;
4309
4310 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4311 {
4312 case is_normal:
4313 case is_solaris:
4314 init_table.plt0_pad_byte = 0x0;
4315 init_table.lazy_plt = &elf_i386_lazy_plt;
4316 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4317 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4318 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4319 break;
4320 case is_vxworks:
4321 init_table.plt0_pad_byte = 0x90;
4322 init_table.lazy_plt = &elf_i386_lazy_plt;
4323 init_table.non_lazy_plt = NULL;
4324 init_table.lazy_ibt_plt = NULL;
4325 init_table.non_lazy_ibt_plt = NULL;
4326 break;
4327 case is_nacl:
4328 init_table.plt0_pad_byte = 0x90;
4329 init_table.lazy_plt = &elf_i386_nacl_plt;
4330 init_table.non_lazy_plt = NULL;
4331 init_table.lazy_ibt_plt = NULL;
4332 init_table.non_lazy_ibt_plt = NULL;
4333 break;
4334 }
4335
4336 init_table.r_info = elf32_r_info;
4337 init_table.r_sym = elf32_r_sym;
4338
4339 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4340 }
4341
4342 #define TARGET_LITTLE_SYM i386_elf32_vec
4343 #define TARGET_LITTLE_NAME "elf32-i386"
4344 #define ELF_ARCH bfd_arch_i386
4345 #define ELF_TARGET_ID I386_ELF_DATA
4346 #define ELF_MACHINE_CODE EM_386
4347 #define ELF_MAXPAGESIZE 0x1000
4348
4349 #define elf_backend_can_gc_sections 1
4350 #define elf_backend_can_refcount 1
4351 #define elf_backend_want_got_plt 1
4352 #define elf_backend_plt_readonly 1
4353 #define elf_backend_want_plt_sym 0
4354 #define elf_backend_got_header_size 12
4355 #define elf_backend_plt_alignment 4
4356 #define elf_backend_dtrel_excludes_plt 1
4357 #define elf_backend_extern_protected_data 1
4358 #define elf_backend_caches_rawsize 1
4359 #define elf_backend_want_dynrelro 1
4360
4361 /* Support RELA for objdump of prelink objects. */
4362 #define elf_info_to_howto elf_i386_info_to_howto_rel
4363 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4364
4365 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4366 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4367 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4368 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4369
4370 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4371 #define elf_backend_check_relocs elf_i386_check_relocs
4372 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4373 #define elf_backend_fake_sections elf_i386_fake_sections
4374 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4375 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4376 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4377 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4378 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4379 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4380 #define elf_backend_relocate_section elf_i386_relocate_section
4381 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4382 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4383
4384 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4385
4386 #define elf32_bed elf32_i386_bed
4387
4388 #include "elf32-target.h"
4389
4390 /* FreeBSD support. */
4391
4392 #undef TARGET_LITTLE_SYM
4393 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4394 #undef TARGET_LITTLE_NAME
4395 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4396 #undef ELF_OSABI
4397 #define ELF_OSABI ELFOSABI_FREEBSD
4398
4399 /* The kernel recognizes executables as valid only if they carry a
4400 "FreeBSD" label in the ELF header. So we put this label on all
4401 executables and (for simplicity) also all other object files. */
4402
4403 static bfd_boolean
4404 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4405 {
4406 if (!_bfd_elf_init_file_header (abfd, info))
4407 return FALSE;
4408
4409 #ifdef OLD_FREEBSD_ABI_LABEL
4410 {
4411 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4412 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4413 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4414 }
4415 #endif
4416 return TRUE;
4417 }
4418
4419 #undef elf_backend_init_file_header
4420 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4421 #undef elf32_bed
4422 #define elf32_bed elf32_i386_fbsd_bed
4423
4424 #undef elf_backend_add_symbol_hook
4425
4426 #include "elf32-target.h"
4427
4428 #undef elf_backend_init_file_header
4429
4430 /* Solaris 2. */
4431
4432 #undef TARGET_LITTLE_SYM
4433 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4434 #undef TARGET_LITTLE_NAME
4435 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4436
4437 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4438 {
4439 is_solaris /* os */
4440 };
4441
4442 #undef elf_backend_arch_data
4443 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4444
4445 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4446 objects won't be recognized. */
4447 #undef ELF_OSABI
4448
4449 #undef elf32_bed
4450 #define elf32_bed elf32_i386_sol2_bed
4451
4452 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4453 boundary. */
4454 #undef elf_backend_static_tls_alignment
4455 #define elf_backend_static_tls_alignment 8
4456
4457 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4458
4459 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4460 File, p.63. */
4461 #undef elf_backend_want_plt_sym
4462 #define elf_backend_want_plt_sym 1
4463
4464 #undef elf_backend_strtab_flags
4465 #define elf_backend_strtab_flags SHF_STRINGS
4466
4467 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4468 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4469 FALSE otherwise. ISECTION is the best guess matching section from the
4470 input bfd IBFD, but it might be NULL. */
4471
4472 static bfd_boolean
4473 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4474 bfd *obfd ATTRIBUTE_UNUSED,
4475 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4476 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4477 {
4478 /* PR 19938: FIXME: Need to add code for setting the sh_info
4479 and sh_link fields of Solaris specific section types. */
4480 return FALSE;
4481
4482 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4483 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4484
4485 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4486
4487 The following values should be set:
4488
4489 Type Link Info
4490 -----------------------------------------------------------------------------
4491 SHT_SUNW_ancillary The section header index of 0
4492 [0x6fffffee] the associated string table.
4493
4494 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4495 [0x6ffffff0] the associated symbol table. section header index of
4496 the associated
4497 SHT_SUNW_capchain table,
4498 otherwise 0.
4499
4500 SHT_SUNW_symsort The section header index of 0
4501 [0x6ffffff1] the associated symbol table.
4502
4503 SHT_SUNW_tlssort The section header index of 0
4504 [0x6ffffff2] the associated symbol table.
4505
4506 SHT_SUNW_LDYNSYM The section header index of One greater than the
4507 [0x6ffffff3] the associated string table. symbol table index of the
4508 This index is the same string last local symbol,
4509 table used by the SHT_DYNSYM STB_LOCAL. Since
4510 section. SHT_SUNW_LDYNSYM only
4511 contains local symbols,
4512 sh_info is equivalent to
4513 the number of symbols in
4514 the table.
4515
4516 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4517 [0x6ffffff5] the section header index of to named strings, the
4518 the associated section header index of
4519 SHT_SUNW_capinfo table, the associated string
4520 otherwise 0. table, otherwise 0.
4521
4522 SHT_SUNW_move The section header index of 0
4523 [0x6ffffffa] the associated symbol table.
4524
4525 SHT_SUNW_COMDAT 0 0
4526 [0x6ffffffb]
4527
4528 SHT_SUNW_syminfo The section header index of The section header index
4529 [0x6ffffffc] the associated symbol table. of the associated
4530 .dynamic section.
4531
4532 SHT_SUNW_verdef The section header index of The number of version
4533 [0x6ffffffd] the associated string table. definitions within the
4534 section.
4535
4536 SHT_SUNW_verneed The section header index of The number of version
4537 [0x6ffffffe] the associated string table. dependencies within the
4538 section.
4539
4540 SHT_SUNW_versym The section header index of 0
4541 [0x6fffffff] the associated symbol table. */
4542 }
4543
4544 #undef elf_backend_copy_special_section_fields
4545 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4546
4547 #include "elf32-target.h"
4548
4549 /* Intel MCU support. */
4550
4551 static bfd_boolean
4552 elf32_iamcu_elf_object_p (bfd *abfd)
4553 {
4554 /* Set the right machine number for an IAMCU elf32 file. */
4555 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4556 return TRUE;
4557 }
4558
4559 #undef TARGET_LITTLE_SYM
4560 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4561 #undef TARGET_LITTLE_NAME
4562 #define TARGET_LITTLE_NAME "elf32-iamcu"
4563 #undef ELF_ARCH
4564 #define ELF_ARCH bfd_arch_iamcu
4565
4566 #undef ELF_MACHINE_CODE
4567 #define ELF_MACHINE_CODE EM_IAMCU
4568
4569 #undef elf_backend_arch_data
4570 #define elf_backend_arch_data &elf_i386_arch_bed
4571
4572 #undef ELF_OSABI
4573
4574 #undef elf32_bed
4575 #define elf32_bed elf32_iamcu_bed
4576
4577 #undef elf_backend_object_p
4578 #define elf_backend_object_p elf32_iamcu_elf_object_p
4579
4580 #undef elf_backend_static_tls_alignment
4581
4582 #undef elf_backend_want_plt_sym
4583 #define elf_backend_want_plt_sym 0
4584
4585 #undef elf_backend_strtab_flags
4586 #undef elf_backend_copy_special_section_fields
4587
4588 #include "elf32-target.h"
4589
4590 /* Restore defaults. */
4591 #undef ELF_ARCH
4592 #define ELF_ARCH bfd_arch_i386
4593 #undef ELF_MACHINE_CODE
4594 #define ELF_MACHINE_CODE EM_386
4595
4596 /* Native Client support. */
4597
4598 #undef TARGET_LITTLE_SYM
4599 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4600 #undef TARGET_LITTLE_NAME
4601 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4602 #undef elf32_bed
4603 #define elf32_bed elf32_i386_nacl_bed
4604
4605 #undef ELF_MAXPAGESIZE
4606 #define ELF_MAXPAGESIZE 0x10000
4607
4608 /* Restore defaults. */
4609 #undef ELF_OSABI
4610 #undef elf_backend_want_plt_sym
4611 #define elf_backend_want_plt_sym 0
4612 #undef elf_backend_static_tls_alignment
4613
4614 /* NaCl uses substantially different PLT entries for the same effects. */
4615
4616 #undef elf_backend_plt_alignment
4617 #define elf_backend_plt_alignment 5
4618 #define NACL_PLT_ENTRY_SIZE 64
4619 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4620
4621 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4622 {
4623 0xff, 0x35, /* pushl contents of address */
4624 0, 0, 0, 0, /* replaced with address of .got + 4. */
4625 0x8b, 0x0d, /* movl contents of address, %ecx */
4626 0, 0, 0, 0, /* replaced with address of .got + 8. */
4627 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4628 0xff, 0xe1 /* jmp *%ecx */
4629 };
4630
4631 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4632 {
4633 0x8b, 0x0d, /* movl contents of address, %ecx */
4634 0, 0, 0, 0, /* replaced with GOT slot address. */
4635 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4636 0xff, 0xe1, /* jmp *%ecx */
4637
4638 /* Pad to the next 32-byte boundary with nop instructions. */
4639 0x90,
4640 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4641 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4642
4643 /* Lazy GOT entries point here (32-byte aligned). */
4644 0x68, /* pushl immediate */
4645 0, 0, 0, 0, /* replaced with reloc offset. */
4646 0xe9, /* jmp relative */
4647 0, 0, 0, 0, /* replaced with offset to .plt. */
4648
4649 /* Pad to the next 32-byte boundary with nop instructions. */
4650 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4651 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4652 0x90, 0x90
4653 };
4654
4655 static const bfd_byte
4656 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4657 {
4658 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4659 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4660 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4661 0xff, 0xe1, /* jmp *%ecx */
4662
4663 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4664 so pad to that size with nop instructions. */
4665 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4666 };
4667
4668 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4669 {
4670 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4671 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4672 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4673 0xff, 0xe1, /* jmp *%ecx */
4674
4675 /* Pad to the next 32-byte boundary with nop instructions. */
4676 0x90,
4677 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4678 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4679
4680 /* Lazy GOT entries point here (32-byte aligned). */
4681 0x68, /* pushl immediate */
4682 0, 0, 0, 0, /* replaced with offset into relocation table. */
4683 0xe9, /* jmp relative */
4684 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4685
4686 /* Pad to the next 32-byte boundary with nop instructions. */
4687 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4688 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4689 0x90, 0x90
4690 };
4691
4692 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4693 {
4694 #if (PLT_CIE_LENGTH != 20 \
4695 || PLT_FDE_LENGTH != 36 \
4696 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4697 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4698 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4699 #endif
4700 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4701 0, 0, 0, 0, /* CIE ID */
4702 1, /* CIE version */
4703 'z', 'R', 0, /* Augmentation string */
4704 1, /* Code alignment factor */
4705 0x7c, /* Data alignment factor: -4 */
4706 8, /* Return address column */
4707 1, /* Augmentation size */
4708 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4709 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4710 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4711 DW_CFA_nop, DW_CFA_nop,
4712
4713 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4714 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4715 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4716 0, 0, 0, 0, /* .plt size goes here */
4717 0, /* Augmentation size */
4718 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4719 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4720 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4721 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4722 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4723 13, /* Block length */
4724 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4725 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4726 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4727 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4728 DW_CFA_nop, DW_CFA_nop
4729 };
4730
4731 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4732 {
4733 elf_i386_nacl_plt0_entry, /* plt0_entry */
4734 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4735 elf_i386_nacl_plt_entry, /* plt_entry */
4736 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4737 NULL, /* plt_tlsdesc_entry */
4738 0, /* plt_tlsdesc_entry_size*/
4739 0, /* plt_tlsdesc_got1_offset */
4740 0, /* plt_tlsdesc_got2_offset */
4741 0, /* plt_tlsdesc_got1_insn_end */
4742 0, /* plt_tlsdesc_got2_insn_end */
4743 2, /* plt0_got1_offset */
4744 8, /* plt0_got2_offset */
4745 0, /* plt0_got2_insn_end */
4746 2, /* plt_got_offset */
4747 33, /* plt_reloc_offset */
4748 38, /* plt_plt_offset */
4749 0, /* plt_got_insn_size */
4750 0, /* plt_plt_insn_end */
4751 32, /* plt_lazy_offset */
4752 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4753 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4754 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4755 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4756 };
4757
4758 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4759 {
4760 is_nacl /* os */
4761 };
4762
4763 static bfd_boolean
4764 elf32_i386_nacl_elf_object_p (bfd *abfd)
4765 {
4766 /* Set the right machine number for a NaCl i386 ELF32 file. */
4767 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4768 return TRUE;
4769 }
4770
4771 #undef elf_backend_arch_data
4772 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4773
4774 #undef elf_backend_object_p
4775 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4776 #undef elf_backend_modify_segment_map
4777 #define elf_backend_modify_segment_map nacl_modify_segment_map
4778 #undef elf_backend_modify_headers
4779 #define elf_backend_modify_headers nacl_modify_headers
4780 #undef elf_backend_final_write_processing
4781 #define elf_backend_final_write_processing nacl_final_write_processing
4782
4783 #include "elf32-target.h"
4784
4785 /* Restore defaults. */
4786 #undef elf_backend_object_p
4787 #undef elf_backend_modify_segment_map
4788 #undef elf_backend_modify_headers
4789 #undef elf_backend_final_write_processing
4790
4791 /* VxWorks support. */
4792
4793 #undef TARGET_LITTLE_SYM
4794 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4795 #undef TARGET_LITTLE_NAME
4796 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4797 #undef ELF_OSABI
4798 #undef ELF_MAXPAGESIZE
4799 #define ELF_MAXPAGESIZE 0x1000
4800 #undef elf_backend_plt_alignment
4801 #define elf_backend_plt_alignment 4
4802
4803 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4804 {
4805 is_vxworks /* os */
4806 };
4807
4808 #undef elf_backend_arch_data
4809 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4810
4811 #undef elf_backend_relocs_compatible
4812 #undef elf_backend_add_symbol_hook
4813 #define elf_backend_add_symbol_hook \
4814 elf_vxworks_add_symbol_hook
4815 #undef elf_backend_link_output_symbol_hook
4816 #define elf_backend_link_output_symbol_hook \
4817 elf_vxworks_link_output_symbol_hook
4818 #undef elf_backend_emit_relocs
4819 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4820 #undef elf_backend_final_write_processing
4821 #define elf_backend_final_write_processing \
4822 elf_vxworks_final_write_processing
4823 #undef elf_backend_static_tls_alignment
4824
4825 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4826 define it. */
4827 #undef elf_backend_want_plt_sym
4828 #define elf_backend_want_plt_sym 1
4829
4830 #undef elf32_bed
4831 #define elf32_bed elf32_i386_vxworks_bed
4832
4833 #include "elf32-target.h"
GDB Binutils - Deliverables
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