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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) 1993-2020 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 /* Return TRUE if the TLS access code sequence support transition
847 from R_TYPE. */
848
849 static bfd_boolean
850 elf_i386_check_tls_transition (asection *sec,
851 bfd_byte *contents,
852 Elf_Internal_Shdr *symtab_hdr,
853 struct elf_link_hash_entry **sym_hashes,
854 unsigned int r_type,
855 const Elf_Internal_Rela *rel,
856 const Elf_Internal_Rela *relend)
857 {
858 unsigned int val, type, reg;
859 unsigned long r_symndx;
860 struct elf_link_hash_entry *h;
861 bfd_vma offset;
862 bfd_byte *call;
863 bfd_boolean indirect_call;
864
865 offset = rel->r_offset;
866 switch (r_type)
867 {
868 case R_386_TLS_GD:
869 case R_386_TLS_LDM:
870 if (offset < 2 || (rel + 1) >= relend)
871 return FALSE;
872
873 indirect_call = FALSE;
874 call = contents + offset + 4;
875 val = *(call - 5);
876 type = *(call - 6);
877 if (r_type == R_386_TLS_GD)
878 {
879 /* Check transition from GD access model. Only
880 leal foo@tlsgd(,%ebx,1), %eax
881 call ___tls_get_addr@PLT
882 or
883 leal foo@tlsgd(%ebx) %eax
884 call ___tls_get_addr@PLT
885 nop
886 or
887 leal foo@tlsgd(%reg), %eax
888 call *___tls_get_addr@GOT(%reg)
889 which may be converted to
890 addr32 call ___tls_get_addr
891 can transit to different access model. */
892 if ((offset + 10) > sec->size
893 || (type != 0x8d && type != 0x04))
894 return FALSE;
895
896 if (type == 0x04)
897 {
898 /* leal foo@tlsgd(,%ebx,1), %eax
899 call ___tls_get_addr@PLT */
900 if (offset < 3)
901 return FALSE;
902
903 if (*(call - 7) != 0x8d
904 || val != 0x1d
905 || call[0] != 0xe8)
906 return FALSE;
907 }
908 else
909 {
910 /* This must be
911 leal foo@tlsgd(%ebx), %eax
912 call ___tls_get_addr@PLT
913 nop
914 or
915 leal foo@tlsgd(%reg), %eax
916 call *___tls_get_addr@GOT(%reg)
917 which may be converted to
918 addr32 call ___tls_get_addr
919
920 %eax can't be used as the GOT base register since it
921 is used to pass parameter to ___tls_get_addr. */
922 reg = val & 7;
923 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
924 return FALSE;
925
926 indirect_call = call[0] == 0xff;
927 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
928 && !(call[0] == 0x67 && call[1] == 0xe8)
929 && !(indirect_call
930 && (call[1] & 0xf8) == 0x90
931 && (call[1] & 0x7) == reg))
932 return FALSE;
933 }
934 }
935 else
936 {
937 /* Check transition from LD access model. Only
938 leal foo@tlsldm(%ebx), %eax
939 call ___tls_get_addr@PLT
940 or
941 leal foo@tlsldm(%reg), %eax
942 call *___tls_get_addr@GOT(%reg)
943 which may be converted to
944 addr32 call ___tls_get_addr
945 can transit to different access model. */
946 if (type != 0x8d || (offset + 9) > sec->size)
947 return FALSE;
948
949 /* %eax can't be used as the GOT base register since it is
950 used to pass parameter to ___tls_get_addr. */
951 reg = val & 7;
952 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
953 return FALSE;
954
955 indirect_call = call[0] == 0xff;
956 if (!(reg == 3 && call[0] == 0xe8)
957 && !(call[0] == 0x67 && call[1] == 0xe8)
958 && !(indirect_call
959 && (call[1] & 0xf8) == 0x90
960 && (call[1] & 0x7) == reg))
961 return FALSE;
962 }
963
964 r_symndx = ELF32_R_SYM (rel[1].r_info);
965 if (r_symndx < symtab_hdr->sh_info)
966 return FALSE;
967
968 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
969 if (h == NULL
970 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
971 return FALSE;
972 else if (indirect_call)
973 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
974 else
975 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
976 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
977
978 case R_386_TLS_IE:
979 /* Check transition from IE access model:
980 movl foo@indntpoff(%rip), %eax
981 movl foo@indntpoff(%rip), %reg
982 addl foo@indntpoff(%rip), %reg
983 */
984
985 if (offset < 1 || (offset + 4) > sec->size)
986 return FALSE;
987
988 /* Check "movl foo@tpoff(%rip), %eax" first. */
989 val = bfd_get_8 (abfd, contents + offset - 1);
990 if (val == 0xa1)
991 return TRUE;
992
993 if (offset < 2)
994 return FALSE;
995
996 /* Check movl|addl foo@tpoff(%rip), %reg. */
997 type = bfd_get_8 (abfd, contents + offset - 2);
998 return ((type == 0x8b || type == 0x03)
999 && (val & 0xc7) == 0x05);
1000
1001 case R_386_TLS_GOTIE:
1002 case R_386_TLS_IE_32:
1003 /* Check transition from {IE_32,GOTIE} access model:
1004 subl foo@{tpoff,gontoff}(%reg1), %reg2
1005 movl foo@{tpoff,gontoff}(%reg1), %reg2
1006 addl foo@{tpoff,gontoff}(%reg1), %reg2
1007 */
1008
1009 if (offset < 2 || (offset + 4) > sec->size)
1010 return FALSE;
1011
1012 val = bfd_get_8 (abfd, contents + offset - 1);
1013 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1014 return FALSE;
1015
1016 type = bfd_get_8 (abfd, contents + offset - 2);
1017 return type == 0x8b || type == 0x2b || type == 0x03;
1018
1019 case R_386_TLS_GOTDESC:
1020 /* Check transition from GDesc access model:
1021 leal x@tlsdesc(%ebx), %eax
1022
1023 Make sure it's a leal adding ebx to a 32-bit offset
1024 into any register, although it's probably almost always
1025 going to be eax. */
1026
1027 if (offset < 2 || (offset + 4) > sec->size)
1028 return FALSE;
1029
1030 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1031 return FALSE;
1032
1033 val = bfd_get_8 (abfd, contents + offset - 1);
1034 return (val & 0xc7) == 0x83;
1035
1036 case R_386_TLS_DESC_CALL:
1037 /* Check transition from GDesc access model:
1038 call *x@tlsdesc(%eax)
1039 */
1040 if (offset + 2 <= sec->size)
1041 {
1042 /* Make sure that it's a call *x@tlsdesc(%eax). */
1043 call = contents + offset;
1044 return call[0] == 0xff && call[1] == 0x10;
1045 }
1046
1047 return FALSE;
1048
1049 default:
1050 abort ();
1051 }
1052 }
1053
1054 /* Return TRUE if the TLS access transition is OK or no transition
1055 will be performed. Update R_TYPE if there is a transition. */
1056
1057 static bfd_boolean
1058 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1059 asection *sec, bfd_byte *contents,
1060 Elf_Internal_Shdr *symtab_hdr,
1061 struct elf_link_hash_entry **sym_hashes,
1062 unsigned int *r_type, int tls_type,
1063 const Elf_Internal_Rela *rel,
1064 const Elf_Internal_Rela *relend,
1065 struct elf_link_hash_entry *h,
1066 unsigned long r_symndx,
1067 bfd_boolean from_relocate_section)
1068 {
1069 unsigned int from_type = *r_type;
1070 unsigned int to_type = from_type;
1071 bfd_boolean check = TRUE;
1072
1073 /* Skip TLS transition for functions. */
1074 if (h != NULL
1075 && (h->type == STT_FUNC
1076 || h->type == STT_GNU_IFUNC))
1077 return TRUE;
1078
1079 switch (from_type)
1080 {
1081 case R_386_TLS_GD:
1082 case R_386_TLS_GOTDESC:
1083 case R_386_TLS_DESC_CALL:
1084 case R_386_TLS_IE_32:
1085 case R_386_TLS_IE:
1086 case R_386_TLS_GOTIE:
1087 if (bfd_link_executable (info))
1088 {
1089 if (h == NULL)
1090 to_type = R_386_TLS_LE_32;
1091 else if (from_type != R_386_TLS_IE
1092 && from_type != R_386_TLS_GOTIE)
1093 to_type = R_386_TLS_IE_32;
1094 }
1095
1096 /* When we are called from elf_i386_relocate_section, there may
1097 be additional transitions based on TLS_TYPE. */
1098 if (from_relocate_section)
1099 {
1100 unsigned int new_to_type = to_type;
1101
1102 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1103 new_to_type = R_386_TLS_LE_32;
1104
1105 if (to_type == R_386_TLS_GD
1106 || to_type == R_386_TLS_GOTDESC
1107 || to_type == R_386_TLS_DESC_CALL)
1108 {
1109 if (tls_type == GOT_TLS_IE_POS)
1110 new_to_type = R_386_TLS_GOTIE;
1111 else if (tls_type & GOT_TLS_IE)
1112 new_to_type = R_386_TLS_IE_32;
1113 }
1114
1115 /* We checked the transition before when we were called from
1116 elf_i386_check_relocs. We only want to check the new
1117 transition which hasn't been checked before. */
1118 check = new_to_type != to_type && from_type == to_type;
1119 to_type = new_to_type;
1120 }
1121
1122 break;
1123
1124 case R_386_TLS_LDM:
1125 if (bfd_link_executable (info))
1126 to_type = R_386_TLS_LE_32;
1127 break;
1128
1129 default:
1130 return TRUE;
1131 }
1132
1133 /* Return TRUE if there is no transition. */
1134 if (from_type == to_type)
1135 return TRUE;
1136
1137 /* Check if the transition can be performed. */
1138 if (check
1139 && ! elf_i386_check_tls_transition (sec, contents,
1140 symtab_hdr, sym_hashes,
1141 from_type, rel, relend))
1142 {
1143 reloc_howto_type *from, *to;
1144 const char *name;
1145
1146 from = elf_i386_rtype_to_howto (from_type);
1147 to = elf_i386_rtype_to_howto (to_type);
1148
1149 if (h)
1150 name = h->root.root.string;
1151 else
1152 {
1153 struct elf_x86_link_hash_table *htab;
1154
1155 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1156 if (htab == NULL)
1157 name = "*unknown*";
1158 else
1159 {
1160 Elf_Internal_Sym *isym;
1161
1162 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1163 abfd, r_symndx);
1164 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1165 }
1166 }
1167
1168 _bfd_error_handler
1169 /* xgettext:c-format */
1170 (_("%pB: TLS transition from %s to %s against `%s'"
1171 " at %#" PRIx64 " in section `%pA' failed"),
1172 abfd, from->name, to->name, name,
1173 (uint64_t) rel->r_offset, sec);
1174 bfd_set_error (bfd_error_bad_value);
1175 return FALSE;
1176 }
1177
1178 *r_type = to_type;
1179 return TRUE;
1180 }
1181
1182 /* With the local symbol, foo, we convert
1183 mov foo@GOT[(%reg1)], %reg2
1184 to
1185 lea foo[@GOTOFF(%reg1)], %reg2
1186 and convert
1187 call/jmp *foo@GOT[(%reg)]
1188 to
1189 nop call foo/jmp foo nop
1190 When PIC is false, convert
1191 test %reg1, foo@GOT[(%reg2)]
1192 to
1193 test $foo, %reg1
1194 and convert
1195 binop foo@GOT[(%reg1)], %reg2
1196 to
1197 binop $foo, %reg2
1198 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1199 instructions. */
1200
1201 static
1202 bfd_boolean
1203 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1204 bfd_byte *contents,
1205 unsigned int *r_type_p,
1206 Elf_Internal_Rela *irel,
1207 struct elf_link_hash_entry *h,
1208 bfd_boolean *converted,
1209 struct bfd_link_info *link_info)
1210 {
1211 struct elf_x86_link_hash_table *htab;
1212 unsigned int opcode;
1213 unsigned int modrm;
1214 bfd_boolean baseless;
1215 Elf_Internal_Sym *isym;
1216 unsigned int addend;
1217 unsigned int nop;
1218 bfd_vma nop_offset;
1219 bfd_boolean is_pic;
1220 bfd_boolean to_reloc_32;
1221 bfd_boolean abs_symbol;
1222 unsigned int r_type;
1223 unsigned int r_symndx;
1224 bfd_vma roff = irel->r_offset;
1225 bfd_boolean local_ref;
1226 struct elf_x86_link_hash_entry *eh;
1227
1228 if (roff < 2)
1229 return TRUE;
1230
1231 /* Addend for R_386_GOT32X relocations must be 0. */
1232 addend = bfd_get_32 (abfd, contents + roff);
1233 if (addend != 0)
1234 return TRUE;
1235
1236 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1237 is_pic = bfd_link_pic (link_info);
1238
1239 r_type = *r_type_p;
1240 r_symndx = ELF32_R_SYM (irel->r_info);
1241
1242 modrm = bfd_get_8 (abfd, contents + roff - 1);
1243 baseless = (modrm & 0xc7) == 0x5;
1244
1245 if (h)
1246 {
1247 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1248 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1249 isym = NULL;
1250 abs_symbol = ABS_SYMBOL_P (h);
1251 }
1252 else
1253 {
1254 local_ref = TRUE;
1255 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1256 r_symndx);
1257 abs_symbol = isym->st_shndx == SHN_ABS;
1258 }
1259
1260 if (baseless && is_pic)
1261 {
1262 /* For PIC, disallow R_386_GOT32X without a base register
1263 since we don't know what the GOT base is. */
1264 const char *name;
1265
1266 if (h == NULL)
1267 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1268 else
1269 name = h->root.root.string;
1270
1271 _bfd_error_handler
1272 /* xgettext:c-format */
1273 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1274 " register can not be used when making a shared object"),
1275 abfd, name);
1276 return FALSE;
1277 }
1278
1279 opcode = bfd_get_8 (abfd, contents + roff - 2);
1280
1281 /* Convert to R_386_32 if PIC is false or there is no base
1282 register. */
1283 to_reloc_32 = !is_pic || baseless;
1284
1285 eh = elf_x86_hash_entry (h);
1286
1287 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1288 reloc. */
1289 if (h == NULL)
1290 {
1291 if (opcode == 0x0ff)
1292 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1293 goto convert_branch;
1294 else
1295 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1296 "test %reg1, foo@GOT(%reg2)" and
1297 "binop foo@GOT[(%reg1)], %reg2". */
1298 goto convert_load;
1299 }
1300
1301 /* Undefined weak symbol is only bound locally in executable
1302 and its reference is resolved as 0. */
1303 if (h->root.type == bfd_link_hash_undefweak
1304 && !eh->linker_def
1305 && local_ref)
1306 {
1307 if (opcode == 0xff)
1308 {
1309 /* No direct branch to 0 for PIC. */
1310 if (is_pic)
1311 return TRUE;
1312 else
1313 goto convert_branch;
1314 }
1315 else
1316 {
1317 /* We can convert load of address 0 to R_386_32. */
1318 to_reloc_32 = TRUE;
1319 goto convert_load;
1320 }
1321 }
1322
1323 if (opcode == 0xff)
1324 {
1325 /* We have "call/jmp *foo@GOT[(%reg)]". */
1326 if ((h->root.type == bfd_link_hash_defined
1327 || h->root.type == bfd_link_hash_defweak)
1328 && local_ref)
1329 {
1330 /* The function is locally defined. */
1331 convert_branch:
1332 /* Convert R_386_GOT32X to R_386_PC32. */
1333 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1334 {
1335 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1336 is a nop prefix. */
1337 modrm = 0xe8;
1338 /* To support TLS optimization, always use addr32 prefix
1339 for "call *___tls_get_addr@GOT(%reg)". */
1340 if (eh && eh->tls_get_addr)
1341 {
1342 nop = 0x67;
1343 nop_offset = irel->r_offset - 2;
1344 }
1345 else
1346 {
1347 nop = htab->params->call_nop_byte;
1348 if (htab->params->call_nop_as_suffix)
1349 {
1350 nop_offset = roff + 3;
1351 irel->r_offset -= 1;
1352 }
1353 else
1354 nop_offset = roff - 2;
1355 }
1356 }
1357 else
1358 {
1359 /* Convert to "jmp foo nop". */
1360 modrm = 0xe9;
1361 nop = NOP_OPCODE;
1362 nop_offset = roff + 3;
1363 irel->r_offset -= 1;
1364 }
1365
1366 bfd_put_8 (abfd, nop, contents + nop_offset);
1367 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1368 /* When converting to PC-relative relocation, we
1369 need to adjust addend by -4. */
1370 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1371 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1372 *r_type_p = R_386_PC32;
1373 *converted = TRUE;
1374 }
1375 }
1376 else
1377 {
1378 /* We have "mov foo@GOT[(%re1g)], %reg2",
1379 "test %reg1, foo@GOT(%reg2)" and
1380 "binop foo@GOT[(%reg1)], %reg2".
1381
1382 Avoid optimizing _DYNAMIC since ld.so may use its
1383 link-time address. */
1384 if (h == htab->elf.hdynamic)
1385 return TRUE;
1386
1387 /* def_regular is set by an assignment in a linker script in
1388 bfd_elf_record_link_assignment. start_stop is set on
1389 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1390 if (h->start_stop
1391 || eh->linker_def
1392 || ((h->def_regular
1393 || h->root.type == bfd_link_hash_defined
1394 || h->root.type == bfd_link_hash_defweak)
1395 && local_ref))
1396 {
1397 convert_load:
1398 if (opcode == 0x8b)
1399 {
1400 if (abs_symbol && local_ref)
1401 to_reloc_32 = TRUE;
1402
1403 if (to_reloc_32)
1404 {
1405 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1406 "mov $foo, %reg2" with R_386_32. */
1407 r_type = R_386_32;
1408 modrm = 0xc0 | (modrm & 0x38) >> 3;
1409 bfd_put_8 (abfd, modrm, contents + roff - 1);
1410 opcode = 0xc7;
1411 }
1412 else
1413 {
1414 /* Convert "mov foo@GOT(%reg1), %reg2" to
1415 "lea foo@GOTOFF(%reg1), %reg2". */
1416 r_type = R_386_GOTOFF;
1417 opcode = 0x8d;
1418 }
1419 }
1420 else
1421 {
1422 /* Only R_386_32 is supported. */
1423 if (!to_reloc_32)
1424 return TRUE;
1425
1426 if (opcode == 0x85)
1427 {
1428 /* Convert "test %reg1, foo@GOT(%reg2)" to
1429 "test $foo, %reg1". */
1430 modrm = 0xc0 | (modrm & 0x38) >> 3;
1431 opcode = 0xf7;
1432 }
1433 else
1434 {
1435 /* Convert "binop foo@GOT(%reg1), %reg2" to
1436 "binop $foo, %reg2". */
1437 modrm = (0xc0
1438 | (modrm & 0x38) >> 3
1439 | (opcode & 0x3c));
1440 opcode = 0x81;
1441 }
1442 bfd_put_8 (abfd, modrm, contents + roff - 1);
1443 r_type = R_386_32;
1444 }
1445
1446 bfd_put_8 (abfd, opcode, contents + roff - 2);
1447 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1448 *r_type_p = r_type;
1449 *converted = TRUE;
1450 }
1451 }
1452
1453 return TRUE;
1454 }
1455
1456 /* Rename some of the generic section flags to better document how they
1457 are used here. */
1458 #define check_relocs_failed sec_flg0
1459
1460 /* Look through the relocs for a section during the first phase, and
1461 calculate needed space in the global offset table, procedure linkage
1462 table, and dynamic reloc sections. */
1463
1464 static bfd_boolean
1465 elf_i386_check_relocs (bfd *abfd,
1466 struct bfd_link_info *info,
1467 asection *sec,
1468 const Elf_Internal_Rela *relocs)
1469 {
1470 struct elf_x86_link_hash_table *htab;
1471 Elf_Internal_Shdr *symtab_hdr;
1472 struct elf_link_hash_entry **sym_hashes;
1473 const Elf_Internal_Rela *rel;
1474 const Elf_Internal_Rela *rel_end;
1475 asection *sreloc;
1476 bfd_byte *contents;
1477 bfd_boolean converted;
1478
1479 if (bfd_link_relocatable (info))
1480 return TRUE;
1481
1482 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1483 if (htab == NULL)
1484 {
1485 sec->check_relocs_failed = 1;
1486 return FALSE;
1487 }
1488
1489 BFD_ASSERT (is_x86_elf (abfd, htab));
1490
1491 /* Get the section contents. */
1492 if (elf_section_data (sec)->this_hdr.contents != NULL)
1493 contents = elf_section_data (sec)->this_hdr.contents;
1494 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1495 {
1496 sec->check_relocs_failed = 1;
1497 return FALSE;
1498 }
1499
1500 symtab_hdr = &elf_symtab_hdr (abfd);
1501 sym_hashes = elf_sym_hashes (abfd);
1502
1503 converted = FALSE;
1504
1505 sreloc = NULL;
1506
1507 rel_end = relocs + sec->reloc_count;
1508 for (rel = relocs; rel < rel_end; rel++)
1509 {
1510 unsigned int r_type;
1511 unsigned int r_symndx;
1512 struct elf_link_hash_entry *h;
1513 struct elf_x86_link_hash_entry *eh;
1514 Elf_Internal_Sym *isym;
1515 const char *name;
1516 bfd_boolean size_reloc;
1517 bfd_boolean no_dynreloc;
1518
1519 r_symndx = ELF32_R_SYM (rel->r_info);
1520 r_type = ELF32_R_TYPE (rel->r_info);
1521
1522 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1523 {
1524 /* xgettext:c-format */
1525 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1526 abfd, r_symndx);
1527 goto error_return;
1528 }
1529
1530 if (r_symndx < symtab_hdr->sh_info)
1531 {
1532 /* A local symbol. */
1533 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1534 abfd, r_symndx);
1535 if (isym == NULL)
1536 goto error_return;
1537
1538 /* Check relocation against local STT_GNU_IFUNC symbol. */
1539 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1540 {
1541 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1542 if (h == NULL)
1543 goto error_return;
1544
1545 /* Fake a STT_GNU_IFUNC symbol. */
1546 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1547 isym, NULL);
1548 h->type = STT_GNU_IFUNC;
1549 h->def_regular = 1;
1550 h->ref_regular = 1;
1551 h->forced_local = 1;
1552 h->root.type = bfd_link_hash_defined;
1553 }
1554 else
1555 h = NULL;
1556 }
1557 else
1558 {
1559 isym = NULL;
1560 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1561 while (h->root.type == bfd_link_hash_indirect
1562 || h->root.type == bfd_link_hash_warning)
1563 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1564 }
1565
1566 eh = (struct elf_x86_link_hash_entry *) h;
1567 if (h != NULL)
1568 {
1569 if (r_type == R_386_GOTOFF)
1570 eh->gotoff_ref = 1;
1571
1572 /* It is referenced by a non-shared object. */
1573 h->ref_regular = 1;
1574 }
1575
1576 if (r_type == R_386_GOT32X
1577 && (h == NULL || h->type != STT_GNU_IFUNC))
1578 {
1579 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1580 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1581 &r_type, irel, h,
1582 &converted, info))
1583 goto error_return;
1584 }
1585
1586 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1587 symtab_hdr, &no_dynreloc))
1588 return FALSE;
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 (!no_dynreloc
1831 && NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1832 R_386_32))
1833 {
1834 struct elf_dyn_relocs *p;
1835 struct elf_dyn_relocs **head;
1836
1837 /* We must copy these reloc types into the output file.
1838 Create a reloc section in dynobj and make room for
1839 this reloc. */
1840 if (sreloc == NULL)
1841 {
1842 sreloc = _bfd_elf_make_dynamic_reloc_section
1843 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1844
1845 if (sreloc == NULL)
1846 goto error_return;
1847 }
1848
1849 /* If this is a global symbol, we count the number of
1850 relocations we need for this symbol. */
1851 if (h != NULL)
1852 {
1853 head = &h->dyn_relocs;
1854 }
1855 else
1856 {
1857 /* Track dynamic relocs needed for local syms too.
1858 We really need local syms available to do this
1859 easily. Oh well. */
1860 void **vpp;
1861 asection *s;
1862
1863 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1864 abfd, r_symndx);
1865 if (isym == NULL)
1866 goto error_return;
1867
1868 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1869 if (s == NULL)
1870 s = sec;
1871
1872 vpp = &elf_section_data (s)->local_dynrel;
1873 head = (struct elf_dyn_relocs **)vpp;
1874 }
1875
1876 p = *head;
1877 if (p == NULL || p->sec != sec)
1878 {
1879 size_t amt = sizeof *p;
1880 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1881 amt);
1882 if (p == NULL)
1883 goto error_return;
1884 p->next = *head;
1885 *head = p;
1886 p->sec = sec;
1887 p->count = 0;
1888 p->pc_count = 0;
1889 }
1890
1891 p->count += 1;
1892 /* Count size relocation as PC-relative relocation. */
1893 if (r_type == R_386_PC32 || size_reloc)
1894 p->pc_count += 1;
1895 }
1896 break;
1897
1898 /* This relocation describes the C++ object vtable hierarchy.
1899 Reconstruct it for later use during GC. */
1900 case R_386_GNU_VTINHERIT:
1901 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1902 goto error_return;
1903 break;
1904
1905 /* This relocation describes which C++ vtable entries are actually
1906 used. Record for later use during GC. */
1907 case R_386_GNU_VTENTRY:
1908 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1909 goto error_return;
1910 break;
1911
1912 default:
1913 break;
1914 }
1915 }
1916
1917 if (elf_section_data (sec)->this_hdr.contents != contents)
1918 {
1919 if (!converted && !info->keep_memory)
1920 free (contents);
1921 else
1922 {
1923 /* Cache the section contents for elf_link_input_bfd if any
1924 load is converted or --no-keep-memory isn't used. */
1925 elf_section_data (sec)->this_hdr.contents = contents;
1926 }
1927 }
1928
1929 /* Cache relocations if any load is converted. */
1930 if (elf_section_data (sec)->relocs != relocs && converted)
1931 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1932
1933 return TRUE;
1934
1935 error_return:
1936 if (elf_section_data (sec)->this_hdr.contents != contents)
1937 free (contents);
1938 sec->check_relocs_failed = 1;
1939 return FALSE;
1940 }
1941
1942 /* Set the correct type for an x86 ELF section. We do this by the
1943 section name, which is a hack, but ought to work. */
1944
1945 static bfd_boolean
1946 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1947 Elf_Internal_Shdr *hdr,
1948 asection *sec)
1949 {
1950 const char *name;
1951
1952 name = bfd_section_name (sec);
1953
1954 /* This is an ugly, but unfortunately necessary hack that is
1955 needed when producing EFI binaries on x86. It tells
1956 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1957 containing ELF relocation info. We need this hack in order to
1958 be able to generate ELF binaries that can be translated into
1959 EFI applications (which are essentially COFF objects). Those
1960 files contain a COFF ".reloc" section inside an ELFNN object,
1961 which would normally cause BFD to segfault because it would
1962 attempt to interpret this section as containing relocation
1963 entries for section "oc". With this hack enabled, ".reloc"
1964 will be treated as a normal data section, which will avoid the
1965 segfault. However, you won't be able to create an ELFNN binary
1966 with a section named "oc" that needs relocations, but that's
1967 the kind of ugly side-effects you get when detecting section
1968 types based on their names... In practice, this limitation is
1969 unlikely to bite. */
1970 if (strcmp (name, ".reloc") == 0)
1971 hdr->sh_type = SHT_PROGBITS;
1972
1973 return TRUE;
1974 }
1975
1976 /* Return the relocation value for @tpoff relocation
1977 if STT_TLS virtual address is ADDRESS. */
1978
1979 static bfd_vma
1980 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1981 {
1982 struct elf_link_hash_table *htab = elf_hash_table (info);
1983 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1984 bfd_vma static_tls_size;
1985
1986 /* If tls_sec is NULL, we should have signalled an error already. */
1987 if (htab->tls_sec == NULL)
1988 return 0;
1989
1990 /* Consider special static TLS alignment requirements. */
1991 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1992 return static_tls_size + htab->tls_sec->vma - address;
1993 }
1994
1995 /* Relocate an i386 ELF section. */
1996
1997 static bfd_boolean
1998 elf_i386_relocate_section (bfd *output_bfd,
1999 struct bfd_link_info *info,
2000 bfd *input_bfd,
2001 asection *input_section,
2002 bfd_byte *contents,
2003 Elf_Internal_Rela *relocs,
2004 Elf_Internal_Sym *local_syms,
2005 asection **local_sections)
2006 {
2007 struct elf_x86_link_hash_table *htab;
2008 Elf_Internal_Shdr *symtab_hdr;
2009 struct elf_link_hash_entry **sym_hashes;
2010 bfd_vma *local_got_offsets;
2011 bfd_vma *local_tlsdesc_gotents;
2012 Elf_Internal_Rela *rel;
2013 Elf_Internal_Rela *wrel;
2014 Elf_Internal_Rela *relend;
2015 bfd_boolean is_vxworks_tls;
2016 unsigned plt_entry_size;
2017
2018 /* Skip if check_relocs failed. */
2019 if (input_section->check_relocs_failed)
2020 return FALSE;
2021
2022 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2023 if (htab == NULL)
2024 return FALSE;
2025
2026 if (!is_x86_elf (input_bfd, htab))
2027 {
2028 bfd_set_error (bfd_error_wrong_format);
2029 return FALSE;
2030 }
2031
2032 symtab_hdr = &elf_symtab_hdr (input_bfd);
2033 sym_hashes = elf_sym_hashes (input_bfd);
2034 local_got_offsets = elf_local_got_offsets (input_bfd);
2035 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2036 /* We have to handle relocations in vxworks .tls_vars sections
2037 specially, because the dynamic loader is 'weird'. */
2038 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2039 && bfd_link_pic (info)
2040 && !strcmp (input_section->output_section->name,
2041 ".tls_vars"));
2042
2043 _bfd_x86_elf_set_tls_module_base (info);
2044
2045 plt_entry_size = htab->plt.plt_entry_size;
2046
2047 rel = wrel = relocs;
2048 relend = relocs + input_section->reloc_count;
2049 for (; rel < relend; wrel++, rel++)
2050 {
2051 unsigned int r_type, r_type_tls;
2052 reloc_howto_type *howto;
2053 unsigned long r_symndx;
2054 struct elf_link_hash_entry *h;
2055 struct elf_x86_link_hash_entry *eh;
2056 Elf_Internal_Sym *sym;
2057 asection *sec;
2058 bfd_vma off, offplt, plt_offset;
2059 bfd_vma relocation;
2060 bfd_boolean unresolved_reloc;
2061 bfd_reloc_status_type r;
2062 unsigned int indx;
2063 int tls_type;
2064 bfd_vma st_size;
2065 asection *resolved_plt;
2066 bfd_boolean resolved_to_zero;
2067 bfd_boolean relative_reloc;
2068
2069 r_type = ELF32_R_TYPE (rel->r_info);
2070 if (r_type == R_386_GNU_VTINHERIT
2071 || r_type == R_386_GNU_VTENTRY)
2072 {
2073 if (wrel != rel)
2074 *wrel = *rel;
2075 continue;
2076 }
2077
2078 howto = elf_i386_rtype_to_howto (r_type);
2079 if (howto == NULL)
2080 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2081
2082 r_symndx = ELF32_R_SYM (rel->r_info);
2083 h = NULL;
2084 sym = NULL;
2085 sec = NULL;
2086 unresolved_reloc = FALSE;
2087 if (r_symndx < symtab_hdr->sh_info)
2088 {
2089 sym = local_syms + r_symndx;
2090 sec = local_sections[r_symndx];
2091 relocation = (sec->output_section->vma
2092 + sec->output_offset
2093 + sym->st_value);
2094 st_size = sym->st_size;
2095
2096 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2097 && ((sec->flags & SEC_MERGE) != 0
2098 || (bfd_link_relocatable (info)
2099 && sec->output_offset != 0)))
2100 {
2101 bfd_vma addend;
2102 bfd_byte *where = contents + rel->r_offset;
2103
2104 switch (howto->size)
2105 {
2106 case 0:
2107 addend = bfd_get_8 (input_bfd, where);
2108 if (howto->pc_relative)
2109 {
2110 addend = (addend ^ 0x80) - 0x80;
2111 addend += 1;
2112 }
2113 break;
2114 case 1:
2115 addend = bfd_get_16 (input_bfd, where);
2116 if (howto->pc_relative)
2117 {
2118 addend = (addend ^ 0x8000) - 0x8000;
2119 addend += 2;
2120 }
2121 break;
2122 case 2:
2123 addend = bfd_get_32 (input_bfd, where);
2124 if (howto->pc_relative)
2125 {
2126 addend = (addend ^ 0x80000000) - 0x80000000;
2127 addend += 4;
2128 }
2129 break;
2130 default:
2131 abort ();
2132 }
2133
2134 if (bfd_link_relocatable (info))
2135 addend += sec->output_offset;
2136 else
2137 {
2138 asection *msec = sec;
2139 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2140 addend);
2141 addend -= relocation;
2142 addend += msec->output_section->vma + msec->output_offset;
2143 }
2144
2145 switch (howto->size)
2146 {
2147 case 0:
2148 /* FIXME: overflow checks. */
2149 if (howto->pc_relative)
2150 addend -= 1;
2151 bfd_put_8 (input_bfd, addend, where);
2152 break;
2153 case 1:
2154 if (howto->pc_relative)
2155 addend -= 2;
2156 bfd_put_16 (input_bfd, addend, where);
2157 break;
2158 case 2:
2159 if (howto->pc_relative)
2160 addend -= 4;
2161 bfd_put_32 (input_bfd, addend, where);
2162 break;
2163 }
2164 }
2165 else if (!bfd_link_relocatable (info)
2166 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2167 {
2168 /* Relocate against local STT_GNU_IFUNC symbol. */
2169 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2170 FALSE);
2171 if (h == NULL)
2172 abort ();
2173
2174 /* Set STT_GNU_IFUNC symbol value. */
2175 h->root.u.def.value = sym->st_value;
2176 h->root.u.def.section = sec;
2177 }
2178 }
2179 else
2180 {
2181 bfd_boolean warned ATTRIBUTE_UNUSED;
2182 bfd_boolean ignored ATTRIBUTE_UNUSED;
2183
2184 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2185 r_symndx, symtab_hdr, sym_hashes,
2186 h, sec, relocation,
2187 unresolved_reloc, warned, ignored);
2188 st_size = h->size;
2189 }
2190
2191 if (sec != NULL && discarded_section (sec))
2192 {
2193 _bfd_clear_contents (howto, input_bfd, input_section,
2194 contents, rel->r_offset);
2195 wrel->r_offset = rel->r_offset;
2196 wrel->r_info = 0;
2197 wrel->r_addend = 0;
2198
2199 /* For ld -r, remove relocations in debug sections against
2200 sections defined in discarded sections. Not done for
2201 eh_frame editing code expects to be present. */
2202 if (bfd_link_relocatable (info)
2203 && (input_section->flags & SEC_DEBUGGING))
2204 wrel--;
2205
2206 continue;
2207 }
2208
2209 if (bfd_link_relocatable (info))
2210 {
2211 if (wrel != rel)
2212 *wrel = *rel;
2213 continue;
2214 }
2215
2216 eh = (struct elf_x86_link_hash_entry *) h;
2217
2218 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2219 it here if it is defined in a non-shared object. */
2220 if (h != NULL
2221 && h->type == STT_GNU_IFUNC
2222 && h->def_regular)
2223 {
2224 asection *gotplt, *base_got;
2225 bfd_vma plt_index;
2226 const char *name;
2227
2228 if ((input_section->flags & SEC_ALLOC) == 0)
2229 {
2230 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2231 STT_GNU_IFUNC symbol as STT_FUNC. */
2232 if (elf_section_type (input_section) == SHT_NOTE)
2233 goto skip_ifunc;
2234 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2235 sections because such sections are not SEC_ALLOC and
2236 thus ld.so will not process them. */
2237 if ((input_section->flags & SEC_DEBUGGING) != 0)
2238 continue;
2239 abort ();
2240 }
2241
2242 /* STT_GNU_IFUNC symbol must go through PLT. */
2243 if (htab->elf.splt != NULL)
2244 {
2245 if (htab->plt_second != NULL)
2246 {
2247 resolved_plt = htab->plt_second;
2248 plt_offset = eh->plt_second.offset;
2249 }
2250 else
2251 {
2252 resolved_plt = htab->elf.splt;
2253 plt_offset = h->plt.offset;
2254 }
2255 gotplt = htab->elf.sgotplt;
2256 }
2257 else
2258 {
2259 resolved_plt = htab->elf.iplt;
2260 plt_offset = h->plt.offset;
2261 gotplt = htab->elf.igotplt;
2262 }
2263
2264 switch (r_type)
2265 {
2266 default:
2267 break;
2268
2269 case R_386_GOT32:
2270 case R_386_GOT32X:
2271 base_got = htab->elf.sgot;
2272 off = h->got.offset;
2273
2274 if (base_got == NULL)
2275 abort ();
2276
2277 if (off == (bfd_vma) -1)
2278 {
2279 /* We can't use h->got.offset here to save state, or
2280 even just remember the offset, as finish_dynamic_symbol
2281 would use that as offset into .got. */
2282
2283 if (h->plt.offset == (bfd_vma) -1)
2284 abort ();
2285
2286 if (htab->elf.splt != NULL)
2287 {
2288 plt_index = (h->plt.offset / plt_entry_size
2289 - htab->plt.has_plt0);
2290 off = (plt_index + 3) * 4;
2291 base_got = htab->elf.sgotplt;
2292 }
2293 else
2294 {
2295 plt_index = h->plt.offset / plt_entry_size;
2296 off = plt_index * 4;
2297 base_got = htab->elf.igotplt;
2298 }
2299
2300 if (h->dynindx == -1
2301 || h->forced_local
2302 || info->symbolic)
2303 {
2304 /* This references the local defitionion. We must
2305 initialize this entry in the global offset table.
2306 Since the offset must always be a multiple of 8,
2307 we use the least significant bit to record
2308 whether we have initialized it already.
2309
2310 When doing a dynamic link, we create a .rela.got
2311 relocation entry to initialize the value. This
2312 is done in the finish_dynamic_symbol routine. */
2313 if ((off & 1) != 0)
2314 off &= ~1;
2315 else
2316 {
2317 bfd_put_32 (output_bfd, relocation,
2318 base_got->contents + off);
2319 h->got.offset |= 1;
2320 }
2321 }
2322
2323 relocation = off;
2324 }
2325 else
2326 relocation = (base_got->output_section->vma
2327 + base_got->output_offset + off
2328 - gotplt->output_section->vma
2329 - gotplt->output_offset);
2330
2331 if (rel->r_offset > 1
2332 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2333 && *(contents + rel->r_offset - 2) != 0x8d)
2334 {
2335 if (bfd_link_pic (info))
2336 goto disallow_got32;
2337
2338 /* Add the GOT base if there is no base register. */
2339 relocation += (gotplt->output_section->vma
2340 + gotplt->output_offset);
2341 }
2342 else if (htab->elf.splt == NULL)
2343 {
2344 /* Adjust for static executables. */
2345 relocation += gotplt->output_offset;
2346 }
2347
2348 goto do_relocation;
2349 }
2350
2351 if (h->plt.offset == (bfd_vma) -1)
2352 {
2353 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2354 if (r_type == R_386_32
2355 && (input_section->flags & SEC_CODE) == 0)
2356 goto do_ifunc_pointer;
2357 goto bad_ifunc_reloc;
2358 }
2359
2360 relocation = (resolved_plt->output_section->vma
2361 + resolved_plt->output_offset + plt_offset);
2362
2363 switch (r_type)
2364 {
2365 default:
2366 bad_ifunc_reloc:
2367 if (h->root.root.string)
2368 name = h->root.root.string;
2369 else
2370 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2371 NULL);
2372 _bfd_error_handler
2373 /* xgettext:c-format */
2374 (_("%pB: relocation %s against STT_GNU_IFUNC "
2375 "symbol `%s' isn't supported"), input_bfd,
2376 howto->name, name);
2377 bfd_set_error (bfd_error_bad_value);
2378 return FALSE;
2379
2380 case R_386_32:
2381 /* Generate dynamic relcoation only when there is a
2382 non-GOT reference in a shared object. */
2383 if ((bfd_link_pic (info) && h->non_got_ref)
2384 || h->plt.offset == (bfd_vma) -1)
2385 {
2386 Elf_Internal_Rela outrel;
2387 asection *sreloc;
2388 bfd_vma offset;
2389
2390 do_ifunc_pointer:
2391 /* Need a dynamic relocation to get the real function
2392 adddress. */
2393 offset = _bfd_elf_section_offset (output_bfd,
2394 info,
2395 input_section,
2396 rel->r_offset);
2397 if (offset == (bfd_vma) -1
2398 || offset == (bfd_vma) -2)
2399 abort ();
2400
2401 outrel.r_offset = (input_section->output_section->vma
2402 + input_section->output_offset
2403 + offset);
2404
2405 if (POINTER_LOCAL_IFUNC_P (info, h))
2406 {
2407 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2408 h->root.root.string,
2409 h->root.u.def.section->owner);
2410
2411 /* This symbol is resolved locally. */
2412 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2413 bfd_put_32 (output_bfd,
2414 (h->root.u.def.value
2415 + h->root.u.def.section->output_section->vma
2416 + h->root.u.def.section->output_offset),
2417 contents + offset);
2418 }
2419 else
2420 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2421
2422 /* Dynamic relocations are stored in
2423 1. .rel.ifunc section in PIC object.
2424 2. .rel.got section in dynamic executable.
2425 3. .rel.iplt section in static executable. */
2426 if (bfd_link_pic (info))
2427 sreloc = htab->elf.irelifunc;
2428 else if (htab->elf.splt != NULL)
2429 sreloc = htab->elf.srelgot;
2430 else
2431 sreloc = htab->elf.irelplt;
2432 elf_append_rel (output_bfd, sreloc, &outrel);
2433
2434 /* If this reloc is against an external symbol, we
2435 do not want to fiddle with the addend. Otherwise,
2436 we need to include the symbol value so that it
2437 becomes an addend for the dynamic reloc. For an
2438 internal symbol, we have updated addend. */
2439 continue;
2440 }
2441 /* FALLTHROUGH */
2442 case R_386_PC32:
2443 case R_386_PLT32:
2444 goto do_relocation;
2445
2446 case R_386_GOTOFF:
2447 relocation -= (gotplt->output_section->vma
2448 + gotplt->output_offset);
2449 goto do_relocation;
2450 }
2451 }
2452
2453 skip_ifunc:
2454 resolved_to_zero = (eh != NULL
2455 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2456
2457 switch (r_type)
2458 {
2459 case R_386_GOT32X:
2460 case R_386_GOT32:
2461 /* Relocation is to the entry for this symbol in the global
2462 offset table. */
2463 if (htab->elf.sgot == NULL)
2464 abort ();
2465
2466 relative_reloc = FALSE;
2467 if (h != NULL)
2468 {
2469 off = h->got.offset;
2470 if (RESOLVED_LOCALLY_P (info, h, htab))
2471 {
2472 /* We must initialize this entry in the global offset
2473 table. Since the offset must always be a multiple
2474 of 4, we use the least significant bit to record
2475 whether we have initialized it already.
2476
2477 When doing a dynamic link, we create a .rel.got
2478 relocation entry to initialize the value. This
2479 is done in the finish_dynamic_symbol routine. */
2480 if ((off & 1) != 0)
2481 off &= ~1;
2482 else
2483 {
2484 bfd_put_32 (output_bfd, relocation,
2485 htab->elf.sgot->contents + off);
2486 h->got.offset |= 1;
2487
2488 if (GENERATE_RELATIVE_RELOC_P (info, h))
2489 {
2490 /* PR ld/21402: If this symbol isn't dynamic
2491 in PIC, generate R_386_RELATIVE here. */
2492 eh->no_finish_dynamic_symbol = 1;
2493 relative_reloc = TRUE;
2494 }
2495 }
2496 }
2497 else
2498 unresolved_reloc = FALSE;
2499 }
2500 else
2501 {
2502 if (local_got_offsets == NULL)
2503 abort ();
2504
2505 off = local_got_offsets[r_symndx];
2506
2507 /* The offset must always be a multiple of 4. We use
2508 the least significant bit to record whether we have
2509 already generated the necessary reloc. */
2510 if ((off & 1) != 0)
2511 off &= ~1;
2512 else
2513 {
2514 bfd_put_32 (output_bfd, relocation,
2515 htab->elf.sgot->contents + off);
2516 local_got_offsets[r_symndx] |= 1;
2517
2518 if (bfd_link_pic (info))
2519 relative_reloc = TRUE;
2520 }
2521 }
2522
2523 if (relative_reloc)
2524 {
2525 asection *s;
2526 Elf_Internal_Rela outrel;
2527
2528 s = htab->elf.srelgot;
2529 if (s == NULL)
2530 abort ();
2531
2532 outrel.r_offset = (htab->elf.sgot->output_section->vma
2533 + htab->elf.sgot->output_offset
2534 + off);
2535 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2536 elf_append_rel (output_bfd, s, &outrel);
2537 }
2538
2539 if (off >= (bfd_vma) -2)
2540 abort ();
2541
2542 relocation = (htab->elf.sgot->output_section->vma
2543 + htab->elf.sgot->output_offset + off);
2544 if (rel->r_offset > 1
2545 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2546 && *(contents + rel->r_offset - 2) != 0x8d)
2547 {
2548 if (bfd_link_pic (info))
2549 {
2550 /* For PIC, disallow R_386_GOT32 without a base
2551 register, except for "lea foo@GOT, %reg", since
2552 we don't know what the GOT base is. */
2553 const char *name;
2554
2555 disallow_got32:
2556 if (h == NULL || h->root.root.string == NULL)
2557 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2558 NULL);
2559 else
2560 name = h->root.root.string;
2561
2562 _bfd_error_handler
2563 /* xgettext:c-format */
2564 (_("%pB: direct GOT relocation %s against `%s'"
2565 " without base register can not be used"
2566 " when making a shared object"),
2567 input_bfd, howto->name, name);
2568 bfd_set_error (bfd_error_bad_value);
2569 return FALSE;
2570 }
2571 }
2572 else
2573 {
2574 /* Subtract the .got.plt section address only with a base
2575 register. */
2576 relocation -= (htab->elf.sgotplt->output_section->vma
2577 + htab->elf.sgotplt->output_offset);
2578 }
2579
2580 break;
2581
2582 case R_386_GOTOFF:
2583 /* Relocation is relative to the start of the global offset
2584 table. */
2585
2586 /* Check to make sure it isn't a protected function or data
2587 symbol for shared library since it may not be local when
2588 used as function address or with copy relocation. We also
2589 need to make sure that a symbol is referenced locally. */
2590 if (!bfd_link_executable (info) && h)
2591 {
2592 if (!h->def_regular)
2593 {
2594 const char *v;
2595
2596 switch (ELF_ST_VISIBILITY (h->other))
2597 {
2598 case STV_HIDDEN:
2599 v = _("hidden symbol");
2600 break;
2601 case STV_INTERNAL:
2602 v = _("internal symbol");
2603 break;
2604 case STV_PROTECTED:
2605 v = _("protected symbol");
2606 break;
2607 default:
2608 v = _("symbol");
2609 break;
2610 }
2611
2612 _bfd_error_handler
2613 /* xgettext:c-format */
2614 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2615 " `%s' can not be used when making a shared object"),
2616 input_bfd, v, h->root.root.string);
2617 bfd_set_error (bfd_error_bad_value);
2618 return FALSE;
2619 }
2620 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2621 && (h->type == STT_FUNC
2622 || h->type == STT_OBJECT)
2623 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2624 {
2625 _bfd_error_handler
2626 /* xgettext:c-format */
2627 (_("%pB: relocation R_386_GOTOFF against protected %s"
2628 " `%s' can not be used when making a shared object"),
2629 input_bfd,
2630 h->type == STT_FUNC ? "function" : "data",
2631 h->root.root.string);
2632 bfd_set_error (bfd_error_bad_value);
2633 return FALSE;
2634 }
2635 }
2636
2637 /* Note that sgot is not involved in this
2638 calculation. We always want the start of .got.plt. If we
2639 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2640 permitted by the ABI, we might have to change this
2641 calculation. */
2642 relocation -= htab->elf.sgotplt->output_section->vma
2643 + htab->elf.sgotplt->output_offset;
2644 break;
2645
2646 case R_386_GOTPC:
2647 /* Use global offset table as symbol value. */
2648 relocation = htab->elf.sgotplt->output_section->vma
2649 + htab->elf.sgotplt->output_offset;
2650 unresolved_reloc = FALSE;
2651 break;
2652
2653 case R_386_PLT32:
2654 /* Relocation is to the entry for this symbol in the
2655 procedure linkage table. */
2656
2657 /* Resolve a PLT32 reloc against a local symbol directly,
2658 without using the procedure linkage table. */
2659 if (h == NULL)
2660 break;
2661
2662 if ((h->plt.offset == (bfd_vma) -1
2663 && eh->plt_got.offset == (bfd_vma) -1)
2664 || htab->elf.splt == NULL)
2665 {
2666 /* We didn't make a PLT entry for this symbol. This
2667 happens when statically linking PIC code, or when
2668 using -Bsymbolic. */
2669 break;
2670 }
2671
2672 if (h->plt.offset != (bfd_vma) -1)
2673 {
2674 if (htab->plt_second != NULL)
2675 {
2676 resolved_plt = htab->plt_second;
2677 plt_offset = eh->plt_second.offset;
2678 }
2679 else
2680 {
2681 resolved_plt = htab->elf.splt;
2682 plt_offset = h->plt.offset;
2683 }
2684 }
2685 else
2686 {
2687 resolved_plt = htab->plt_got;
2688 plt_offset = eh->plt_got.offset;
2689 }
2690
2691 relocation = (resolved_plt->output_section->vma
2692 + resolved_plt->output_offset
2693 + plt_offset);
2694 unresolved_reloc = FALSE;
2695 break;
2696
2697 case R_386_SIZE32:
2698 /* Set to symbol size. */
2699 relocation = st_size;
2700 /* Fall through. */
2701
2702 case R_386_32:
2703 case R_386_PC32:
2704 if ((input_section->flags & SEC_ALLOC) == 0
2705 || is_vxworks_tls)
2706 break;
2707
2708 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2709 FALSE, resolved_to_zero,
2710 (r_type == R_386_PC32)))
2711 {
2712 Elf_Internal_Rela outrel;
2713 bfd_boolean skip, relocate;
2714 asection *sreloc;
2715
2716 /* When generating a shared object, these relocations
2717 are copied into the output file to be resolved at run
2718 time. */
2719
2720 skip = FALSE;
2721 relocate = FALSE;
2722
2723 outrel.r_offset =
2724 _bfd_elf_section_offset (output_bfd, info, input_section,
2725 rel->r_offset);
2726 if (outrel.r_offset == (bfd_vma) -1)
2727 skip = TRUE;
2728 else if (outrel.r_offset == (bfd_vma) -2)
2729 skip = TRUE, relocate = TRUE;
2730 outrel.r_offset += (input_section->output_section->vma
2731 + input_section->output_offset);
2732
2733 if (skip)
2734 memset (&outrel, 0, sizeof outrel);
2735 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2736 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2737 else
2738 {
2739 /* This symbol is local, or marked to become local. */
2740 relocate = TRUE;
2741 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2742 }
2743
2744 sreloc = elf_section_data (input_section)->sreloc;
2745
2746 if (sreloc == NULL || sreloc->contents == NULL)
2747 {
2748 r = bfd_reloc_notsupported;
2749 goto check_relocation_error;
2750 }
2751
2752 elf_append_rel (output_bfd, sreloc, &outrel);
2753
2754 /* If this reloc is against an external symbol, we do
2755 not want to fiddle with the addend. Otherwise, we
2756 need to include the symbol value so that it becomes
2757 an addend for the dynamic reloc. */
2758 if (! relocate)
2759 continue;
2760 }
2761 break;
2762
2763 case R_386_TLS_IE:
2764 if (!bfd_link_executable (info))
2765 {
2766 Elf_Internal_Rela outrel;
2767 asection *sreloc;
2768
2769 outrel.r_offset = rel->r_offset
2770 + input_section->output_section->vma
2771 + input_section->output_offset;
2772 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2773 sreloc = elf_section_data (input_section)->sreloc;
2774 if (sreloc == NULL)
2775 abort ();
2776 elf_append_rel (output_bfd, sreloc, &outrel);
2777 }
2778 /* Fall through */
2779
2780 case R_386_TLS_GD:
2781 case R_386_TLS_GOTDESC:
2782 case R_386_TLS_DESC_CALL:
2783 case R_386_TLS_IE_32:
2784 case R_386_TLS_GOTIE:
2785 tls_type = GOT_UNKNOWN;
2786 if (h == NULL && local_got_offsets)
2787 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2788 else if (h != NULL)
2789 tls_type = elf_x86_hash_entry(h)->tls_type;
2790 if (tls_type == GOT_TLS_IE)
2791 tls_type = GOT_TLS_IE_NEG;
2792
2793 r_type_tls = r_type;
2794 if (! elf_i386_tls_transition (info, input_bfd,
2795 input_section, contents,
2796 symtab_hdr, sym_hashes,
2797 &r_type_tls, tls_type, rel,
2798 relend, h, r_symndx, TRUE))
2799 return FALSE;
2800
2801 if (r_type_tls == R_386_TLS_LE_32)
2802 {
2803 BFD_ASSERT (! unresolved_reloc);
2804 if (r_type == R_386_TLS_GD)
2805 {
2806 unsigned int type;
2807 bfd_vma roff;
2808
2809 /* GD->LE transition. */
2810 type = *(contents + rel->r_offset - 2);
2811 if (type == 0x04)
2812 {
2813 /* Change
2814 leal foo@tlsgd(,%ebx,1), %eax
2815 call ___tls_get_addr@PLT
2816 into:
2817 movl %gs:0, %eax
2818 subl $foo@tpoff, %eax
2819 (6 byte form of subl). */
2820 roff = rel->r_offset + 5;
2821 }
2822 else
2823 {
2824 /* Change
2825 leal foo@tlsgd(%ebx), %eax
2826 call ___tls_get_addr@PLT
2827 nop
2828 or
2829 leal foo@tlsgd(%reg), %eax
2830 call *___tls_get_addr@GOT(%reg)
2831 which may be converted to
2832 addr32 call ___tls_get_addr
2833 into:
2834 movl %gs:0, %eax; subl $foo@tpoff, %eax
2835 (6 byte form of subl). */
2836 roff = rel->r_offset + 6;
2837 }
2838 memcpy (contents + roff - 8,
2839 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2840 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2841 contents + roff);
2842 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2843 rel++;
2844 wrel++;
2845 continue;
2846 }
2847 else if (r_type == R_386_TLS_GOTDESC)
2848 {
2849 /* GDesc -> LE transition.
2850 It's originally something like:
2851 leal x@tlsdesc(%ebx), %eax
2852
2853 leal x@ntpoff, %eax
2854
2855 Registers other than %eax may be set up here. */
2856
2857 unsigned int val;
2858 bfd_vma roff;
2859
2860 roff = rel->r_offset;
2861 val = bfd_get_8 (input_bfd, contents + roff - 1);
2862
2863 /* Now modify the instruction as appropriate. */
2864 /* aoliva FIXME: remove the above and xor the byte
2865 below with 0x86. */
2866 bfd_put_8 (output_bfd, val ^ 0x86,
2867 contents + roff - 1);
2868 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2869 contents + roff);
2870 continue;
2871 }
2872 else if (r_type == R_386_TLS_DESC_CALL)
2873 {
2874 /* GDesc -> LE transition.
2875 It's originally:
2876 call *(%eax)
2877 Turn it into:
2878 xchg %ax,%ax */
2879
2880 bfd_vma roff;
2881
2882 roff = rel->r_offset;
2883 bfd_put_8 (output_bfd, 0x66, contents + roff);
2884 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2885 continue;
2886 }
2887 else if (r_type == R_386_TLS_IE)
2888 {
2889 unsigned int val;
2890
2891 /* IE->LE transition:
2892 Originally it can be one of:
2893 movl foo, %eax
2894 movl foo, %reg
2895 addl foo, %reg
2896 We change it into:
2897 movl $foo, %eax
2898 movl $foo, %reg
2899 addl $foo, %reg. */
2900 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2901 if (val == 0xa1)
2902 {
2903 /* movl foo, %eax. */
2904 bfd_put_8 (output_bfd, 0xb8,
2905 contents + rel->r_offset - 1);
2906 }
2907 else
2908 {
2909 unsigned int type;
2910
2911 type = bfd_get_8 (input_bfd,
2912 contents + rel->r_offset - 2);
2913 switch (type)
2914 {
2915 case 0x8b:
2916 /* movl */
2917 bfd_put_8 (output_bfd, 0xc7,
2918 contents + rel->r_offset - 2);
2919 bfd_put_8 (output_bfd,
2920 0xc0 | ((val >> 3) & 7),
2921 contents + rel->r_offset - 1);
2922 break;
2923 case 0x03:
2924 /* addl */
2925 bfd_put_8 (output_bfd, 0x81,
2926 contents + rel->r_offset - 2);
2927 bfd_put_8 (output_bfd,
2928 0xc0 | ((val >> 3) & 7),
2929 contents + rel->r_offset - 1);
2930 break;
2931 default:
2932 BFD_FAIL ();
2933 break;
2934 }
2935 }
2936 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2937 contents + rel->r_offset);
2938 continue;
2939 }
2940 else
2941 {
2942 unsigned int val, type;
2943
2944 /* {IE_32,GOTIE}->LE transition:
2945 Originally it can be one of:
2946 subl foo(%reg1), %reg2
2947 movl foo(%reg1), %reg2
2948 addl foo(%reg1), %reg2
2949 We change it into:
2950 subl $foo, %reg2
2951 movl $foo, %reg2 (6 byte form)
2952 addl $foo, %reg2. */
2953 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2954 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2955 if (type == 0x8b)
2956 {
2957 /* movl */
2958 bfd_put_8 (output_bfd, 0xc7,
2959 contents + rel->r_offset - 2);
2960 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2961 contents + rel->r_offset - 1);
2962 }
2963 else if (type == 0x2b)
2964 {
2965 /* subl */
2966 bfd_put_8 (output_bfd, 0x81,
2967 contents + rel->r_offset - 2);
2968 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2969 contents + rel->r_offset - 1);
2970 }
2971 else if (type == 0x03)
2972 {
2973 /* addl */
2974 bfd_put_8 (output_bfd, 0x81,
2975 contents + rel->r_offset - 2);
2976 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2977 contents + rel->r_offset - 1);
2978 }
2979 else
2980 BFD_FAIL ();
2981 if (r_type == R_386_TLS_GOTIE)
2982 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2983 contents + rel->r_offset);
2984 else
2985 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2986 contents + rel->r_offset);
2987 continue;
2988 }
2989 }
2990
2991 if (htab->elf.sgot == NULL)
2992 abort ();
2993
2994 if (h != NULL)
2995 {
2996 off = h->got.offset;
2997 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
2998 }
2999 else
3000 {
3001 if (local_got_offsets == NULL)
3002 abort ();
3003
3004 off = local_got_offsets[r_symndx];
3005 offplt = local_tlsdesc_gotents[r_symndx];
3006 }
3007
3008 if ((off & 1) != 0)
3009 off &= ~1;
3010 else
3011 {
3012 Elf_Internal_Rela outrel;
3013 int dr_type;
3014 asection *sreloc;
3015
3016 if (htab->elf.srelgot == NULL)
3017 abort ();
3018
3019 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3020
3021 if (GOT_TLS_GDESC_P (tls_type))
3022 {
3023 bfd_byte *loc;
3024 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3025 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3026 <= htab->elf.sgotplt->size);
3027 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3028 + htab->elf.sgotplt->output_offset
3029 + offplt
3030 + htab->sgotplt_jump_table_size);
3031 sreloc = htab->elf.srelplt;
3032 loc = sreloc->contents;
3033 loc += (htab->next_tls_desc_index++
3034 * sizeof (Elf32_External_Rel));
3035 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3036 <= sreloc->contents + sreloc->size);
3037 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3038 if (indx == 0)
3039 {
3040 BFD_ASSERT (! unresolved_reloc);
3041 bfd_put_32 (output_bfd,
3042 relocation - _bfd_x86_elf_dtpoff_base (info),
3043 htab->elf.sgotplt->contents + offplt
3044 + htab->sgotplt_jump_table_size + 4);
3045 }
3046 else
3047 {
3048 bfd_put_32 (output_bfd, 0,
3049 htab->elf.sgotplt->contents + offplt
3050 + htab->sgotplt_jump_table_size + 4);
3051 }
3052 }
3053
3054 sreloc = htab->elf.srelgot;
3055
3056 outrel.r_offset = (htab->elf.sgot->output_section->vma
3057 + htab->elf.sgot->output_offset + off);
3058
3059 if (GOT_TLS_GD_P (tls_type))
3060 dr_type = R_386_TLS_DTPMOD32;
3061 else if (GOT_TLS_GDESC_P (tls_type))
3062 goto dr_done;
3063 else if (tls_type == GOT_TLS_IE_POS)
3064 dr_type = R_386_TLS_TPOFF;
3065 else
3066 dr_type = R_386_TLS_TPOFF32;
3067
3068 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3069 bfd_put_32 (output_bfd,
3070 relocation - _bfd_x86_elf_dtpoff_base (info),
3071 htab->elf.sgot->contents + off);
3072 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3073 bfd_put_32 (output_bfd,
3074 _bfd_x86_elf_dtpoff_base (info) - relocation,
3075 htab->elf.sgot->contents + off);
3076 else if (dr_type != R_386_TLS_DESC)
3077 bfd_put_32 (output_bfd, 0,
3078 htab->elf.sgot->contents + off);
3079 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3080
3081 elf_append_rel (output_bfd, sreloc, &outrel);
3082
3083 if (GOT_TLS_GD_P (tls_type))
3084 {
3085 if (indx == 0)
3086 {
3087 BFD_ASSERT (! unresolved_reloc);
3088 bfd_put_32 (output_bfd,
3089 relocation - _bfd_x86_elf_dtpoff_base (info),
3090 htab->elf.sgot->contents + off + 4);
3091 }
3092 else
3093 {
3094 bfd_put_32 (output_bfd, 0,
3095 htab->elf.sgot->contents + off + 4);
3096 outrel.r_info = ELF32_R_INFO (indx,
3097 R_386_TLS_DTPOFF32);
3098 outrel.r_offset += 4;
3099 elf_append_rel (output_bfd, sreloc, &outrel);
3100 }
3101 }
3102 else if (tls_type == GOT_TLS_IE_BOTH)
3103 {
3104 bfd_put_32 (output_bfd,
3105 (indx == 0
3106 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3107 : 0),
3108 htab->elf.sgot->contents + off + 4);
3109 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3110 outrel.r_offset += 4;
3111 elf_append_rel (output_bfd, sreloc, &outrel);
3112 }
3113
3114 dr_done:
3115 if (h != NULL)
3116 h->got.offset |= 1;
3117 else
3118 local_got_offsets[r_symndx] |= 1;
3119 }
3120
3121 if (off >= (bfd_vma) -2
3122 && ! GOT_TLS_GDESC_P (tls_type))
3123 abort ();
3124 if (r_type_tls == R_386_TLS_GOTDESC
3125 || r_type_tls == R_386_TLS_DESC_CALL)
3126 {
3127 relocation = htab->sgotplt_jump_table_size + offplt;
3128 unresolved_reloc = FALSE;
3129 }
3130 else if (r_type_tls == r_type)
3131 {
3132 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3133 + htab->elf.sgotplt->output_offset;
3134 relocation = htab->elf.sgot->output_section->vma
3135 + htab->elf.sgot->output_offset + off - g_o_t;
3136 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3137 && tls_type == GOT_TLS_IE_BOTH)
3138 relocation += 4;
3139 if (r_type == R_386_TLS_IE)
3140 relocation += g_o_t;
3141 unresolved_reloc = FALSE;
3142 }
3143 else if (r_type == R_386_TLS_GD)
3144 {
3145 unsigned int val, type;
3146 bfd_vma roff;
3147
3148 /* GD->IE transition. */
3149 type = *(contents + rel->r_offset - 2);
3150 val = *(contents + rel->r_offset - 1);
3151 if (type == 0x04)
3152 {
3153 /* Change
3154 leal foo@tlsgd(,%ebx,1), %eax
3155 call ___tls_get_addr@PLT
3156 into:
3157 movl %gs:0, %eax
3158 subl $foo@gottpoff(%ebx), %eax. */
3159 val >>= 3;
3160 roff = rel->r_offset - 3;
3161 }
3162 else
3163 {
3164 /* Change
3165 leal foo@tlsgd(%ebx), %eax
3166 call ___tls_get_addr@PLT
3167 nop
3168 or
3169 leal foo@tlsgd(%reg), %eax
3170 call *___tls_get_addr@GOT(%reg)
3171 which may be converted to
3172 addr32 call ___tls_get_addr
3173 into:
3174 movl %gs:0, %eax;
3175 subl $foo@gottpoff(%reg), %eax. */
3176 roff = rel->r_offset - 2;
3177 }
3178 memcpy (contents + roff,
3179 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3180 contents[roff + 7] = 0x80 | (val & 7);
3181 /* If foo is used only with foo@gotntpoff(%reg) and
3182 foo@indntpoff, but not with foo@gottpoff(%reg), change
3183 subl $foo@gottpoff(%reg), %eax
3184 into:
3185 addl $foo@gotntpoff(%reg), %eax. */
3186 if (tls_type == GOT_TLS_IE_POS)
3187 contents[roff + 6] = 0x03;
3188 bfd_put_32 (output_bfd,
3189 htab->elf.sgot->output_section->vma
3190 + htab->elf.sgot->output_offset + off
3191 - htab->elf.sgotplt->output_section->vma
3192 - htab->elf.sgotplt->output_offset,
3193 contents + roff + 8);
3194 /* Skip R_386_PLT32 and R_386_GOT32X. */
3195 rel++;
3196 wrel++;
3197 continue;
3198 }
3199 else if (r_type == R_386_TLS_GOTDESC)
3200 {
3201 /* GDesc -> IE transition.
3202 It's originally something like:
3203 leal x@tlsdesc(%ebx), %eax
3204
3205 Change it to:
3206 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3207 or:
3208 movl x@gottpoff(%ebx), %eax # before negl %eax
3209
3210 Registers other than %eax may be set up here. */
3211
3212 bfd_vma roff;
3213
3214 /* First, make sure it's a leal adding ebx to a 32-bit
3215 offset into any register, although it's probably
3216 almost always going to be eax. */
3217 roff = rel->r_offset;
3218
3219 /* Now modify the instruction as appropriate. */
3220 /* To turn a leal into a movl in the form we use it, it
3221 suffices to change the first byte from 0x8d to 0x8b.
3222 aoliva FIXME: should we decide to keep the leal, all
3223 we have to do is remove the statement below, and
3224 adjust the relaxation of R_386_TLS_DESC_CALL. */
3225 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3226
3227 if (tls_type == GOT_TLS_IE_BOTH)
3228 off += 4;
3229
3230 bfd_put_32 (output_bfd,
3231 htab->elf.sgot->output_section->vma
3232 + htab->elf.sgot->output_offset + off
3233 - htab->elf.sgotplt->output_section->vma
3234 - htab->elf.sgotplt->output_offset,
3235 contents + roff);
3236 continue;
3237 }
3238 else if (r_type == R_386_TLS_DESC_CALL)
3239 {
3240 /* GDesc -> IE transition.
3241 It's originally:
3242 call *(%eax)
3243
3244 Change it to:
3245 xchg %ax,%ax
3246 or
3247 negl %eax
3248 depending on how we transformed the TLS_GOTDESC above.
3249 */
3250
3251 bfd_vma roff;
3252
3253 roff = rel->r_offset;
3254
3255 /* Now modify the instruction as appropriate. */
3256 if (tls_type != GOT_TLS_IE_NEG)
3257 {
3258 /* xchg %ax,%ax */
3259 bfd_put_8 (output_bfd, 0x66, contents + roff);
3260 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3261 }
3262 else
3263 {
3264 /* negl %eax */
3265 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3266 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3267 }
3268
3269 continue;
3270 }
3271 else
3272 BFD_ASSERT (FALSE);
3273 break;
3274
3275 case R_386_TLS_LDM:
3276 if (! elf_i386_tls_transition (info, input_bfd,
3277 input_section, contents,
3278 symtab_hdr, sym_hashes,
3279 &r_type, GOT_UNKNOWN, rel,
3280 relend, h, r_symndx, TRUE))
3281 return FALSE;
3282
3283 if (r_type != R_386_TLS_LDM)
3284 {
3285 /* LD->LE transition. Change
3286 leal foo@tlsldm(%ebx) %eax
3287 call ___tls_get_addr@PLT
3288 into:
3289 movl %gs:0, %eax
3290 nop
3291 leal 0(%esi,1), %esi
3292 or change
3293 leal foo@tlsldm(%reg) %eax
3294 call *___tls_get_addr@GOT(%reg)
3295 which may be converted to
3296 addr32 call ___tls_get_addr
3297 into:
3298 movl %gs:0, %eax
3299 leal 0(%esi), %esi */
3300 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3301 if (*(contents + rel->r_offset + 4) == 0xff
3302 || *(contents + rel->r_offset + 4) == 0x67)
3303 memcpy (contents + rel->r_offset - 2,
3304 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3305 else
3306 memcpy (contents + rel->r_offset - 2,
3307 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3308 /* Skip R_386_PC32/R_386_PLT32. */
3309 rel++;
3310 wrel++;
3311 continue;
3312 }
3313
3314 if (htab->elf.sgot == NULL)
3315 abort ();
3316
3317 off = htab->tls_ld_or_ldm_got.offset;
3318 if (off & 1)
3319 off &= ~1;
3320 else
3321 {
3322 Elf_Internal_Rela outrel;
3323
3324 if (htab->elf.srelgot == NULL)
3325 abort ();
3326
3327 outrel.r_offset = (htab->elf.sgot->output_section->vma
3328 + htab->elf.sgot->output_offset + off);
3329
3330 bfd_put_32 (output_bfd, 0,
3331 htab->elf.sgot->contents + off);
3332 bfd_put_32 (output_bfd, 0,
3333 htab->elf.sgot->contents + off + 4);
3334 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3335 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3336 htab->tls_ld_or_ldm_got.offset |= 1;
3337 }
3338 relocation = htab->elf.sgot->output_section->vma
3339 + htab->elf.sgot->output_offset + off
3340 - htab->elf.sgotplt->output_section->vma
3341 - htab->elf.sgotplt->output_offset;
3342 unresolved_reloc = FALSE;
3343 break;
3344
3345 case R_386_TLS_LDO_32:
3346 if (!bfd_link_executable (info)
3347 || (input_section->flags & SEC_CODE) == 0)
3348 relocation -= _bfd_x86_elf_dtpoff_base (info);
3349 else
3350 /* When converting LDO to LE, we must negate. */
3351 relocation = -elf_i386_tpoff (info, relocation);
3352 break;
3353
3354 case R_386_TLS_LE_32:
3355 case R_386_TLS_LE:
3356 if (!bfd_link_executable (info))
3357 {
3358 Elf_Internal_Rela outrel;
3359 asection *sreloc;
3360
3361 outrel.r_offset = rel->r_offset
3362 + input_section->output_section->vma
3363 + input_section->output_offset;
3364 if (h != NULL && h->dynindx != -1)
3365 indx = h->dynindx;
3366 else
3367 indx = 0;
3368 if (r_type == R_386_TLS_LE_32)
3369 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3370 else
3371 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3372 sreloc = elf_section_data (input_section)->sreloc;
3373 if (sreloc == NULL)
3374 abort ();
3375 elf_append_rel (output_bfd, sreloc, &outrel);
3376 if (indx)
3377 continue;
3378 else if (r_type == R_386_TLS_LE_32)
3379 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3380 else
3381 relocation -= _bfd_x86_elf_dtpoff_base (info);
3382 }
3383 else if (r_type == R_386_TLS_LE_32)
3384 relocation = elf_i386_tpoff (info, relocation);
3385 else
3386 relocation = -elf_i386_tpoff (info, relocation);
3387 break;
3388
3389 default:
3390 break;
3391 }
3392
3393 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3394 because such sections are not SEC_ALLOC and thus ld.so will
3395 not process them. */
3396 if (unresolved_reloc
3397 && !((input_section->flags & SEC_DEBUGGING) != 0
3398 && h->def_dynamic)
3399 && _bfd_elf_section_offset (output_bfd, info, input_section,
3400 rel->r_offset) != (bfd_vma) -1)
3401 {
3402 _bfd_error_handler
3403 /* xgettext:c-format */
3404 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3405 input_bfd,
3406 input_section,
3407 (uint64_t) rel->r_offset,
3408 howto->name,
3409 h->root.root.string);
3410 return FALSE;
3411 }
3412
3413 do_relocation:
3414 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3415 contents, rel->r_offset,
3416 relocation, 0);
3417
3418 check_relocation_error:
3419 if (r != bfd_reloc_ok)
3420 {
3421 const char *name;
3422
3423 if (h != NULL)
3424 name = h->root.root.string;
3425 else
3426 {
3427 name = bfd_elf_string_from_elf_section (input_bfd,
3428 symtab_hdr->sh_link,
3429 sym->st_name);
3430 if (name == NULL)
3431 return FALSE;
3432 if (*name == '\0')
3433 name = bfd_section_name (sec);
3434 }
3435
3436 if (r == bfd_reloc_overflow)
3437 (*info->callbacks->reloc_overflow)
3438 (info, (h ? &h->root : NULL), name, howto->name,
3439 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3440 else
3441 {
3442 _bfd_error_handler
3443 /* xgettext:c-format */
3444 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3445 input_bfd, input_section,
3446 (uint64_t) rel->r_offset, name, (int) r);
3447 return FALSE;
3448 }
3449 }
3450
3451 if (wrel != rel)
3452 *wrel = *rel;
3453 }
3454
3455 if (wrel != rel)
3456 {
3457 Elf_Internal_Shdr *rel_hdr;
3458 size_t deleted = rel - wrel;
3459
3460 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3461 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3462 if (rel_hdr->sh_size == 0)
3463 {
3464 /* It is too late to remove an empty reloc section. Leave
3465 one NONE reloc.
3466 ??? What is wrong with an empty section??? */
3467 rel_hdr->sh_size = rel_hdr->sh_entsize;
3468 deleted -= 1;
3469 }
3470 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3471 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3472 input_section->reloc_count -= deleted;
3473 }
3474
3475 return TRUE;
3476 }
3477
3478 /* Finish up dynamic symbol handling. We set the contents of various
3479 dynamic sections here. */
3480
3481 static bfd_boolean
3482 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3483 struct bfd_link_info *info,
3484 struct elf_link_hash_entry *h,
3485 Elf_Internal_Sym *sym)
3486 {
3487 struct elf_x86_link_hash_table *htab;
3488 unsigned plt_entry_size;
3489 struct elf_x86_link_hash_entry *eh;
3490 bfd_boolean local_undefweak;
3491 bfd_boolean use_plt_second;
3492
3493 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3494 if (htab == NULL)
3495 return FALSE;
3496
3497 plt_entry_size = htab->plt.plt_entry_size;
3498
3499 /* Use the second PLT section only if there is .plt section. */
3500 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3501
3502 eh = (struct elf_x86_link_hash_entry *) h;
3503 if (eh->no_finish_dynamic_symbol)
3504 abort ();
3505
3506 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3507 resolved undefined weak symbols in executable so that their
3508 references have value 0 at run-time. */
3509 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3510
3511 if (h->plt.offset != (bfd_vma) -1)
3512 {
3513 bfd_vma plt_index, plt_offset;
3514 bfd_vma got_offset;
3515 Elf_Internal_Rela rel;
3516 bfd_byte *loc;
3517 asection *plt, *resolved_plt, *gotplt, *relplt;
3518
3519 /* When building a static executable, use .iplt, .igot.plt and
3520 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3521 if (htab->elf.splt != NULL)
3522 {
3523 plt = htab->elf.splt;
3524 gotplt = htab->elf.sgotplt;
3525 relplt = htab->elf.srelplt;
3526 }
3527 else
3528 {
3529 plt = htab->elf.iplt;
3530 gotplt = htab->elf.igotplt;
3531 relplt = htab->elf.irelplt;
3532 }
3533
3534 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3535
3536 /* Get the index in the procedure linkage table which
3537 corresponds to this symbol. This is the index of this symbol
3538 in all the symbols for which we are making plt entries. The
3539 first entry in the procedure linkage table is reserved.
3540
3541 Get the offset into the .got table of the entry that
3542 corresponds to this function. Each .got entry is 4 bytes.
3543 The first three are reserved.
3544
3545 For static executables, we don't reserve anything. */
3546
3547 if (plt == htab->elf.splt)
3548 {
3549 got_offset = (h->plt.offset / plt_entry_size
3550 - htab->plt.has_plt0);
3551 got_offset = (got_offset + 3) * 4;
3552 }
3553 else
3554 {
3555 got_offset = h->plt.offset / plt_entry_size;
3556 got_offset = got_offset * 4;
3557 }
3558
3559 /* Fill in the entry in the procedure linkage table and update
3560 the first slot. */
3561 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3562 plt_entry_size);
3563
3564 if (use_plt_second)
3565 {
3566 const bfd_byte *plt_entry;
3567 if (bfd_link_pic (info))
3568 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3569 else
3570 plt_entry = htab->non_lazy_plt->plt_entry;
3571 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3572 plt_entry, htab->non_lazy_plt->plt_entry_size);
3573
3574 resolved_plt = htab->plt_second;
3575 plt_offset = eh->plt_second.offset;
3576 }
3577 else
3578 {
3579 resolved_plt = plt;
3580 plt_offset = h->plt.offset;
3581 }
3582
3583 if (! bfd_link_pic (info))
3584 {
3585 bfd_put_32 (output_bfd,
3586 (gotplt->output_section->vma
3587 + gotplt->output_offset
3588 + got_offset),
3589 resolved_plt->contents + plt_offset
3590 + htab->plt.plt_got_offset);
3591
3592 if (htab->elf.target_os == is_vxworks)
3593 {
3594 int s, k, reloc_index;
3595
3596 /* Create the R_386_32 relocation referencing the GOT
3597 for this PLT entry. */
3598
3599 /* S: Current slot number (zero-based). */
3600 s = ((h->plt.offset - htab->plt.plt_entry_size)
3601 / htab->plt.plt_entry_size);
3602 /* K: Number of relocations for PLTResolve. */
3603 if (bfd_link_pic (info))
3604 k = PLTRESOLVE_RELOCS_SHLIB;
3605 else
3606 k = PLTRESOLVE_RELOCS;
3607 /* Skip the PLTresolve relocations, and the relocations for
3608 the other PLT slots. */
3609 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3610 loc = (htab->srelplt2->contents + reloc_index
3611 * sizeof (Elf32_External_Rel));
3612
3613 rel.r_offset = (plt->output_section->vma
3614 + plt->output_offset
3615 + h->plt.offset + 2),
3616 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3617 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3618
3619 /* Create the R_386_32 relocation referencing the beginning of
3620 the PLT for this GOT entry. */
3621 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3622 + htab->elf.sgotplt->output_offset
3623 + got_offset);
3624 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3625 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3626 loc + sizeof (Elf32_External_Rel));
3627 }
3628 }
3629 else
3630 {
3631 bfd_put_32 (output_bfd, got_offset,
3632 resolved_plt->contents + plt_offset
3633 + htab->plt.plt_got_offset);
3634 }
3635
3636 /* Fill in the entry in the global offset table. Leave the entry
3637 as zero for undefined weak symbol in PIE. No PLT relocation
3638 against undefined weak symbol in PIE. */
3639 if (!local_undefweak)
3640 {
3641 if (htab->plt.has_plt0)
3642 bfd_put_32 (output_bfd,
3643 (plt->output_section->vma
3644 + plt->output_offset
3645 + h->plt.offset
3646 + htab->lazy_plt->plt_lazy_offset),
3647 gotplt->contents + got_offset);
3648
3649 /* Fill in the entry in the .rel.plt section. */
3650 rel.r_offset = (gotplt->output_section->vma
3651 + gotplt->output_offset
3652 + got_offset);
3653 if (PLT_LOCAL_IFUNC_P (info, h))
3654 {
3655 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3656 h->root.root.string,
3657 h->root.u.def.section->owner);
3658
3659 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3660 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3661 in the .got.plt section. */
3662 bfd_put_32 (output_bfd,
3663 (h->root.u.def.value
3664 + h->root.u.def.section->output_section->vma
3665 + h->root.u.def.section->output_offset),
3666 gotplt->contents + got_offset);
3667 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3668 /* R_386_IRELATIVE comes last. */
3669 plt_index = htab->next_irelative_index--;
3670 }
3671 else
3672 {
3673 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3674 plt_index = htab->next_jump_slot_index++;
3675 }
3676
3677 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3678 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3679
3680 /* Don't fill the second and third slots in PLT entry for
3681 static executables nor without PLT0. */
3682 if (plt == htab->elf.splt && htab->plt.has_plt0)
3683 {
3684 bfd_put_32 (output_bfd,
3685 plt_index * sizeof (Elf32_External_Rel),
3686 plt->contents + h->plt.offset
3687 + htab->lazy_plt->plt_reloc_offset);
3688 bfd_put_32 (output_bfd,
3689 - (h->plt.offset
3690 + htab->lazy_plt->plt_plt_offset + 4),
3691 (plt->contents + h->plt.offset
3692 + htab->lazy_plt->plt_plt_offset));
3693 }
3694 }
3695 }
3696 else if (eh->plt_got.offset != (bfd_vma) -1)
3697 {
3698 bfd_vma got_offset, plt_offset;
3699 asection *plt, *got, *gotplt;
3700 const bfd_byte *got_plt_entry;
3701
3702 /* Set the entry in the GOT procedure linkage table. */
3703 plt = htab->plt_got;
3704 got = htab->elf.sgot;
3705 gotplt = htab->elf.sgotplt;
3706 got_offset = h->got.offset;
3707
3708 if (got_offset == (bfd_vma) -1
3709 || plt == NULL
3710 || got == NULL
3711 || gotplt == NULL)
3712 abort ();
3713
3714 /* Fill in the entry in the GOT procedure linkage table. */
3715 if (! bfd_link_pic (info))
3716 {
3717 got_plt_entry = htab->non_lazy_plt->plt_entry;
3718 got_offset += got->output_section->vma + got->output_offset;
3719 }
3720 else
3721 {
3722 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3723 got_offset += (got->output_section->vma
3724 + got->output_offset
3725 - gotplt->output_section->vma
3726 - gotplt->output_offset);
3727 }
3728
3729 plt_offset = eh->plt_got.offset;
3730 memcpy (plt->contents + plt_offset, got_plt_entry,
3731 htab->non_lazy_plt->plt_entry_size);
3732 bfd_put_32 (output_bfd, got_offset,
3733 (plt->contents + plt_offset
3734 + htab->non_lazy_plt->plt_got_offset));
3735 }
3736
3737 if (!local_undefweak
3738 && !h->def_regular
3739 && (h->plt.offset != (bfd_vma) -1
3740 || eh->plt_got.offset != (bfd_vma) -1))
3741 {
3742 /* Mark the symbol as undefined, rather than as defined in
3743 the .plt section. Leave the value if there were any
3744 relocations where pointer equality matters (this is a clue
3745 for the dynamic linker, to make function pointer
3746 comparisons work between an application and shared
3747 library), otherwise set it to zero. If a function is only
3748 called from a binary, there is no need to slow down
3749 shared libraries because of that. */
3750 sym->st_shndx = SHN_UNDEF;
3751 if (!h->pointer_equality_needed)
3752 sym->st_value = 0;
3753 }
3754
3755 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3756
3757 /* Don't generate dynamic GOT relocation against undefined weak
3758 symbol in executable. */
3759 if (h->got.offset != (bfd_vma) -1
3760 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3761 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3762 && !local_undefweak)
3763 {
3764 Elf_Internal_Rela rel;
3765 asection *relgot = htab->elf.srelgot;
3766
3767 /* This symbol has an entry in the global offset table. Set it
3768 up. */
3769
3770 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3771 abort ();
3772
3773 rel.r_offset = (htab->elf.sgot->output_section->vma
3774 + htab->elf.sgot->output_offset
3775 + (h->got.offset & ~(bfd_vma) 1));
3776
3777 /* If this is a static link, or it is a -Bsymbolic link and the
3778 symbol is defined locally or was forced to be local because
3779 of a version file, we just want to emit a RELATIVE reloc.
3780 The entry in the global offset table will already have been
3781 initialized in the relocate_section function. */
3782 if (h->def_regular
3783 && h->type == STT_GNU_IFUNC)
3784 {
3785 if (h->plt.offset == (bfd_vma) -1)
3786 {
3787 /* STT_GNU_IFUNC is referenced without PLT. */
3788 if (htab->elf.splt == NULL)
3789 {
3790 /* use .rel[a].iplt section to store .got relocations
3791 in static executable. */
3792 relgot = htab->elf.irelplt;
3793 }
3794 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3795 {
3796 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3797 h->root.root.string,
3798 h->root.u.def.section->owner);
3799
3800 bfd_put_32 (output_bfd,
3801 (h->root.u.def.value
3802 + h->root.u.def.section->output_section->vma
3803 + h->root.u.def.section->output_offset),
3804 htab->elf.sgot->contents + h->got.offset);
3805 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3806 }
3807 else
3808 goto do_glob_dat;
3809 }
3810 else if (bfd_link_pic (info))
3811 {
3812 /* Generate R_386_GLOB_DAT. */
3813 goto do_glob_dat;
3814 }
3815 else
3816 {
3817 asection *plt;
3818 bfd_vma plt_offset;
3819
3820 if (!h->pointer_equality_needed)
3821 abort ();
3822
3823 /* For non-shared object, we can't use .got.plt, which
3824 contains the real function addres if we need pointer
3825 equality. We load the GOT entry with the PLT entry. */
3826 if (htab->plt_second != NULL)
3827 {
3828 plt = htab->plt_second;
3829 plt_offset = eh->plt_second.offset;
3830 }
3831 else
3832 {
3833 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3834 plt_offset = h->plt.offset;
3835 }
3836 bfd_put_32 (output_bfd,
3837 (plt->output_section->vma
3838 + plt->output_offset + plt_offset),
3839 htab->elf.sgot->contents + h->got.offset);
3840 return TRUE;
3841 }
3842 }
3843 else if (bfd_link_pic (info)
3844 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3845 {
3846 BFD_ASSERT((h->got.offset & 1) != 0);
3847 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3848 }
3849 else
3850 {
3851 BFD_ASSERT((h->got.offset & 1) == 0);
3852 do_glob_dat:
3853 bfd_put_32 (output_bfd, (bfd_vma) 0,
3854 htab->elf.sgot->contents + h->got.offset);
3855 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3856 }
3857
3858 elf_append_rel (output_bfd, relgot, &rel);
3859 }
3860
3861 if (h->needs_copy)
3862 {
3863 Elf_Internal_Rela rel;
3864 asection *s;
3865
3866 /* This symbol needs a copy reloc. Set it up. */
3867 VERIFY_COPY_RELOC (h, htab)
3868
3869 rel.r_offset = (h->root.u.def.value
3870 + h->root.u.def.section->output_section->vma
3871 + h->root.u.def.section->output_offset);
3872 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3873 if (h->root.u.def.section == htab->elf.sdynrelro)
3874 s = htab->elf.sreldynrelro;
3875 else
3876 s = htab->elf.srelbss;
3877 elf_append_rel (output_bfd, s, &rel);
3878 }
3879
3880 return TRUE;
3881 }
3882
3883 /* Finish up local dynamic symbol handling. We set the contents of
3884 various dynamic sections here. */
3885
3886 static bfd_boolean
3887 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3888 {
3889 struct elf_link_hash_entry *h
3890 = (struct elf_link_hash_entry *) *slot;
3891 struct bfd_link_info *info
3892 = (struct bfd_link_info *) inf;
3893
3894 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3895 h, NULL);
3896 }
3897
3898 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3899 here since undefined weak symbol may not be dynamic and may not be
3900 called for elf_i386_finish_dynamic_symbol. */
3901
3902 static bfd_boolean
3903 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3904 void *inf)
3905 {
3906 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3907 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3908
3909 if (h->root.type != bfd_link_hash_undefweak
3910 || h->dynindx != -1)
3911 return TRUE;
3912
3913 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3914 info, h, NULL);
3915 }
3916
3917 /* Used to decide how to sort relocs in an optimal manner for the
3918 dynamic linker, before writing them out. */
3919
3920 static enum elf_reloc_type_class
3921 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3922 const asection *rel_sec ATTRIBUTE_UNUSED,
3923 const Elf_Internal_Rela *rela)
3924 {
3925 bfd *abfd = info->output_bfd;
3926 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3927 struct elf_link_hash_table *htab = elf_hash_table (info);
3928
3929 if (htab->dynsym != NULL
3930 && htab->dynsym->contents != NULL)
3931 {
3932 /* Check relocation against STT_GNU_IFUNC symbol if there are
3933 dynamic symbols. */
3934 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3935 if (r_symndx != STN_UNDEF)
3936 {
3937 Elf_Internal_Sym sym;
3938 if (!bed->s->swap_symbol_in (abfd,
3939 (htab->dynsym->contents
3940 + r_symndx * sizeof (Elf32_External_Sym)),
3941 0, &sym))
3942 abort ();
3943
3944 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3945 return reloc_class_ifunc;
3946 }
3947 }
3948
3949 switch (ELF32_R_TYPE (rela->r_info))
3950 {
3951 case R_386_IRELATIVE:
3952 return reloc_class_ifunc;
3953 case R_386_RELATIVE:
3954 return reloc_class_relative;
3955 case R_386_JUMP_SLOT:
3956 return reloc_class_plt;
3957 case R_386_COPY:
3958 return reloc_class_copy;
3959 default:
3960 return reloc_class_normal;
3961 }
3962 }
3963
3964 /* Finish up the dynamic sections. */
3965
3966 static bfd_boolean
3967 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3968 struct bfd_link_info *info)
3969 {
3970 struct elf_x86_link_hash_table *htab;
3971
3972 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3973 if (htab == NULL)
3974 return FALSE;
3975
3976 if (!htab->elf.dynamic_sections_created)
3977 return TRUE;
3978
3979 if (htab->elf.splt && htab->elf.splt->size > 0)
3980 {
3981 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3982 really seem like the right value. */
3983 elf_section_data (htab->elf.splt->output_section)
3984 ->this_hdr.sh_entsize = 4;
3985
3986 if (htab->plt.has_plt0)
3987 {
3988 /* Fill in the special first entry in the procedure linkage
3989 table. */
3990 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3991 htab->lazy_plt->plt0_entry_size);
3992 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
3993 htab->plt0_pad_byte,
3994 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
3995 if (!bfd_link_pic (info))
3996 {
3997 bfd_put_32 (output_bfd,
3998 (htab->elf.sgotplt->output_section->vma
3999 + htab->elf.sgotplt->output_offset
4000 + 4),
4001 htab->elf.splt->contents
4002 + htab->lazy_plt->plt0_got1_offset);
4003 bfd_put_32 (output_bfd,
4004 (htab->elf.sgotplt->output_section->vma
4005 + htab->elf.sgotplt->output_offset
4006 + 8),
4007 htab->elf.splt->contents
4008 + htab->lazy_plt->plt0_got2_offset);
4009
4010 if (htab->elf.target_os == is_vxworks)
4011 {
4012 Elf_Internal_Rela rel;
4013 int num_plts = (htab->elf.splt->size
4014 / htab->plt.plt_entry_size) - 1;
4015 unsigned char *p;
4016 asection *srelplt2 = htab->srelplt2;
4017
4018 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4019 + 4. On IA32 we use REL relocations so the
4020 addend goes in the PLT directly. */
4021 rel.r_offset = (htab->elf.splt->output_section->vma
4022 + htab->elf.splt->output_offset
4023 + htab->lazy_plt->plt0_got1_offset);
4024 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4025 R_386_32);
4026 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4027 srelplt2->contents);
4028 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4029 + 8. */
4030 rel.r_offset = (htab->elf.splt->output_section->vma
4031 + htab->elf.splt->output_offset
4032 + htab->lazy_plt->plt0_got2_offset);
4033 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4034 R_386_32);
4035 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4036 srelplt2->contents +
4037 sizeof (Elf32_External_Rel));
4038 /* Correct the .rel.plt.unloaded relocations. */
4039 p = srelplt2->contents;
4040 if (bfd_link_pic (info))
4041 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4042 else
4043 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4044
4045 for (; num_plts; num_plts--)
4046 {
4047 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4048 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4049 R_386_32);
4050 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4051 p += sizeof (Elf32_External_Rel);
4052
4053 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4054 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4055 R_386_32);
4056 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4057 p += sizeof (Elf32_External_Rel);
4058 }
4059 }
4060 }
4061 }
4062 }
4063
4064 /* Fill PLT entries for undefined weak symbols in PIE. */
4065 if (bfd_link_pie (info))
4066 bfd_hash_traverse (&info->hash->table,
4067 elf_i386_pie_finish_undefweak_symbol,
4068 info);
4069
4070 return TRUE;
4071 }
4072
4073 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4074 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4075 It has to be done before elf_link_sort_relocs is called so that
4076 dynamic relocations are properly sorted. */
4077
4078 static bfd_boolean
4079 elf_i386_output_arch_local_syms
4080 (bfd *output_bfd ATTRIBUTE_UNUSED,
4081 struct bfd_link_info *info,
4082 void *flaginfo ATTRIBUTE_UNUSED,
4083 int (*func) (void *, const char *,
4084 Elf_Internal_Sym *,
4085 asection *,
4086 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4087 {
4088 struct elf_x86_link_hash_table *htab
4089 = elf_x86_hash_table (info, I386_ELF_DATA);
4090 if (htab == NULL)
4091 return FALSE;
4092
4093 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4094 htab_traverse (htab->loc_hash_table,
4095 elf_i386_finish_local_dynamic_symbol,
4096 info);
4097
4098 return TRUE;
4099 }
4100
4101 /* Forward declaration. */
4102 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4103
4104 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4105 dynamic relocations. */
4106
4107 static long
4108 elf_i386_get_synthetic_symtab (bfd *abfd,
4109 long symcount ATTRIBUTE_UNUSED,
4110 asymbol **syms ATTRIBUTE_UNUSED,
4111 long dynsymcount,
4112 asymbol **dynsyms,
4113 asymbol **ret)
4114 {
4115 long count, i, n;
4116 int j;
4117 bfd_byte *plt_contents;
4118 long relsize;
4119 const struct elf_x86_lazy_plt_layout *lazy_plt;
4120 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4121 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4122 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4123 asection *plt;
4124 bfd_vma got_addr;
4125 enum elf_x86_plt_type plt_type;
4126 struct elf_x86_plt plts[] =
4127 {
4128 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4129 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4130 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4131 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4132 };
4133
4134 *ret = NULL;
4135
4136 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4137 return 0;
4138
4139 if (dynsymcount <= 0)
4140 return 0;
4141
4142 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4143 if (relsize <= 0)
4144 return -1;
4145
4146 non_lazy_plt = NULL;
4147 /* Silence GCC 6. */
4148 lazy_plt = NULL;
4149 non_lazy_ibt_plt = NULL;
4150 lazy_ibt_plt = NULL;
4151 switch (get_elf_backend_data (abfd)->target_os)
4152 {
4153 case is_normal:
4154 case is_solaris:
4155 non_lazy_plt = &elf_i386_non_lazy_plt;
4156 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4157 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4158 /* Fall through */
4159 case is_vxworks:
4160 lazy_plt = &elf_i386_lazy_plt;
4161 break;
4162 case is_nacl:
4163 lazy_plt = &elf_i386_nacl_plt;
4164 break;
4165 default:
4166 abort ();
4167 }
4168
4169 got_addr = 0;
4170
4171 count = 0;
4172 for (j = 0; plts[j].name != NULL; j++)
4173 {
4174 plt = bfd_get_section_by_name (abfd, plts[j].name);
4175 if (plt == NULL || plt->size == 0)
4176 continue;
4177
4178 /* Get the PLT section contents. */
4179 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4180 if (plt_contents == NULL)
4181 break;
4182 if (!bfd_get_section_contents (abfd, (asection *) plt,
4183 plt_contents, 0, plt->size))
4184 {
4185 free (plt_contents);
4186 break;
4187 }
4188
4189 /* Check what kind of PLT it is. */
4190 plt_type = plt_unknown;
4191 if (plts[j].type == plt_unknown
4192 && (plt->size >= (lazy_plt->plt0_entry_size
4193 + lazy_plt->plt_entry_size)))
4194 {
4195 /* Match lazy PLT first. */
4196 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4197 lazy_plt->plt0_got1_offset) == 0)
4198 {
4199 /* The fist entry in the lazy IBT PLT is the same as the
4200 normal lazy PLT. */
4201 if (lazy_ibt_plt != NULL
4202 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4203 lazy_ibt_plt->plt_entry,
4204 lazy_ibt_plt->plt_got_offset) == 0))
4205 plt_type = plt_lazy | plt_second;
4206 else
4207 plt_type = plt_lazy;
4208 }
4209 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4210 lazy_plt->plt0_got1_offset) == 0)
4211 {
4212 /* The fist entry in the PIC lazy IBT PLT is the same as
4213 the normal PIC lazy PLT. */
4214 if (lazy_ibt_plt != NULL
4215 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4216 lazy_ibt_plt->pic_plt_entry,
4217 lazy_ibt_plt->plt_got_offset) == 0))
4218 plt_type = plt_lazy | plt_pic | plt_second;
4219 else
4220 plt_type = plt_lazy | plt_pic;
4221 }
4222 }
4223
4224 if (non_lazy_plt != NULL
4225 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4226 && plt->size >= non_lazy_plt->plt_entry_size)
4227 {
4228 /* Match non-lazy PLT. */
4229 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4230 non_lazy_plt->plt_got_offset) == 0)
4231 plt_type = plt_non_lazy;
4232 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4233 non_lazy_plt->plt_got_offset) == 0)
4234 plt_type = plt_pic;
4235 }
4236
4237 if ((non_lazy_ibt_plt != NULL)
4238 && (plt_type == plt_unknown || plt_type == plt_second)
4239 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4240 {
4241 if (memcmp (plt_contents,
4242 non_lazy_ibt_plt->plt_entry,
4243 non_lazy_ibt_plt->plt_got_offset) == 0)
4244 {
4245 /* Match IBT PLT. */
4246 plt_type = plt_second;
4247 non_lazy_plt = non_lazy_ibt_plt;
4248 }
4249 else if (memcmp (plt_contents,
4250 non_lazy_ibt_plt->pic_plt_entry,
4251 non_lazy_ibt_plt->plt_got_offset) == 0)
4252 {
4253 /* Match PIC IBT PLT. */
4254 plt_type = plt_second | plt_pic;
4255 non_lazy_plt = non_lazy_ibt_plt;
4256 }
4257 }
4258
4259 if (plt_type == plt_unknown)
4260 {
4261 free (plt_contents);
4262 continue;
4263 }
4264
4265 plts[j].sec = plt;
4266 plts[j].type = plt_type;
4267
4268 if ((plt_type & plt_lazy))
4269 {
4270 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4271 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4272 /* Skip PLT0 in lazy PLT. */
4273 i = 1;
4274 }
4275 else
4276 {
4277 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4278 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4279 i = 0;
4280 }
4281
4282 /* Skip lazy PLT when the second PLT is used. */
4283 if ((plt_type & (plt_lazy | plt_second))
4284 == (plt_lazy | plt_second))
4285 plts[j].count = 0;
4286 else
4287 {
4288 n = plt->size / plts[j].plt_entry_size;
4289 plts[j].count = n;
4290 count += n - i;
4291 }
4292
4293 plts[j].contents = plt_contents;
4294
4295 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4296 if ((plt_type & plt_pic))
4297 got_addr = (bfd_vma) -1;
4298 }
4299
4300 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4301 got_addr, plts, dynsyms,
4302 ret);
4303 }
4304
4305 /* Set up i386 GNU properties. Return the first relocatable ELF input
4306 with GNU properties if found. Otherwise, return NULL. */
4307
4308 static bfd *
4309 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4310 {
4311 struct elf_x86_init_table init_table;
4312
4313 switch (get_elf_backend_data (info->output_bfd)->target_os)
4314 {
4315 case is_normal:
4316 case is_solaris:
4317 init_table.plt0_pad_byte = 0x0;
4318 init_table.lazy_plt = &elf_i386_lazy_plt;
4319 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4320 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4321 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4322 break;
4323 case is_vxworks:
4324 init_table.plt0_pad_byte = 0x90;
4325 init_table.lazy_plt = &elf_i386_lazy_plt;
4326 init_table.non_lazy_plt = NULL;
4327 init_table.lazy_ibt_plt = NULL;
4328 init_table.non_lazy_ibt_plt = NULL;
4329 break;
4330 case is_nacl:
4331 init_table.plt0_pad_byte = 0x90;
4332 init_table.lazy_plt = &elf_i386_nacl_plt;
4333 init_table.non_lazy_plt = NULL;
4334 init_table.lazy_ibt_plt = NULL;
4335 init_table.non_lazy_ibt_plt = NULL;
4336 break;
4337 default:
4338 abort ();
4339 }
4340
4341 init_table.r_info = elf32_r_info;
4342 init_table.r_sym = elf32_r_sym;
4343
4344 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4345 }
4346
4347 #define TARGET_LITTLE_SYM i386_elf32_vec
4348 #define TARGET_LITTLE_NAME "elf32-i386"
4349 #define ELF_ARCH bfd_arch_i386
4350 #define ELF_TARGET_ID I386_ELF_DATA
4351 #define ELF_MACHINE_CODE EM_386
4352 #define ELF_MAXPAGESIZE 0x1000
4353
4354 #define elf_backend_can_gc_sections 1
4355 #define elf_backend_can_refcount 1
4356 #define elf_backend_want_got_plt 1
4357 #define elf_backend_plt_readonly 1
4358 #define elf_backend_want_plt_sym 0
4359 #define elf_backend_got_header_size 12
4360 #define elf_backend_plt_alignment 4
4361 #define elf_backend_dtrel_excludes_plt 1
4362 #define elf_backend_extern_protected_data 1
4363 #define elf_backend_caches_rawsize 1
4364 #define elf_backend_want_dynrelro 1
4365
4366 /* Support RELA for objdump of prelink objects. */
4367 #define elf_info_to_howto elf_i386_info_to_howto_rel
4368 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4369
4370 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4371 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4372 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4373 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4374
4375 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4376 #define elf_backend_check_relocs elf_i386_check_relocs
4377 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4378 #define elf_backend_fake_sections elf_i386_fake_sections
4379 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4380 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4381 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4382 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4383 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4384 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4385 #define elf_backend_relocate_section elf_i386_relocate_section
4386 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4387 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4388
4389 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4390
4391 #define elf32_bed elf32_i386_bed
4392
4393 #include "elf32-target.h"
4394
4395 /* FreeBSD support. */
4396
4397 #undef TARGET_LITTLE_SYM
4398 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4399 #undef TARGET_LITTLE_NAME
4400 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4401 #undef ELF_OSABI
4402 #define ELF_OSABI ELFOSABI_FREEBSD
4403
4404 /* The kernel recognizes executables as valid only if they carry a
4405 "FreeBSD" label in the ELF header. So we put this label on all
4406 executables and (for simplicity) also all other object files. */
4407
4408 static bfd_boolean
4409 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4410 {
4411 if (!_bfd_elf_init_file_header (abfd, info))
4412 return FALSE;
4413
4414 #ifdef OLD_FREEBSD_ABI_LABEL
4415 {
4416 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4417 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4418 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4419 }
4420 #endif
4421 return TRUE;
4422 }
4423
4424 #undef elf_backend_init_file_header
4425 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4426 #undef elf32_bed
4427 #define elf32_bed elf32_i386_fbsd_bed
4428
4429 #undef elf_backend_add_symbol_hook
4430
4431 #include "elf32-target.h"
4432
4433 #undef elf_backend_init_file_header
4434
4435 /* Solaris 2. */
4436
4437 #undef TARGET_LITTLE_SYM
4438 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4439 #undef TARGET_LITTLE_NAME
4440 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4441
4442 #undef ELF_TARGET_OS
4443 #define ELF_TARGET_OS is_solaris
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_TARGET_OS
4570 #undef ELF_OSABI
4571
4572 #undef elf32_bed
4573 #define elf32_bed elf32_iamcu_bed
4574
4575 #undef elf_backend_object_p
4576 #define elf_backend_object_p elf32_iamcu_elf_object_p
4577
4578 #undef elf_backend_static_tls_alignment
4579
4580 #undef elf_backend_want_plt_sym
4581 #define elf_backend_want_plt_sym 0
4582
4583 #undef elf_backend_strtab_flags
4584 #undef elf_backend_copy_special_section_fields
4585
4586 #include "elf32-target.h"
4587
4588 /* Restore defaults. */
4589 #undef ELF_ARCH
4590 #define ELF_ARCH bfd_arch_i386
4591 #undef ELF_MACHINE_CODE
4592 #define ELF_MACHINE_CODE EM_386
4593
4594 /* Native Client support. */
4595
4596 #undef TARGET_LITTLE_SYM
4597 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4598 #undef TARGET_LITTLE_NAME
4599 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4600 #undef elf32_bed
4601 #define elf32_bed elf32_i386_nacl_bed
4602
4603 #undef ELF_MAXPAGESIZE
4604 #define ELF_MAXPAGESIZE 0x10000
4605
4606 /* Restore defaults. */
4607 #undef ELF_OSABI
4608 #undef elf_backend_want_plt_sym
4609 #define elf_backend_want_plt_sym 0
4610 #undef elf_backend_static_tls_alignment
4611
4612 /* NaCl uses substantially different PLT entries for the same effects. */
4613
4614 #undef elf_backend_plt_alignment
4615 #define elf_backend_plt_alignment 5
4616 #define NACL_PLT_ENTRY_SIZE 64
4617 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4618
4619 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4620 {
4621 0xff, 0x35, /* pushl contents of address */
4622 0, 0, 0, 0, /* replaced with address of .got + 4. */
4623 0x8b, 0x0d, /* movl contents of address, %ecx */
4624 0, 0, 0, 0, /* replaced with address of .got + 8. */
4625 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4626 0xff, 0xe1 /* jmp *%ecx */
4627 };
4628
4629 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4630 {
4631 0x8b, 0x0d, /* movl contents of address, %ecx */
4632 0, 0, 0, 0, /* replaced with GOT slot address. */
4633 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4634 0xff, 0xe1, /* jmp *%ecx */
4635
4636 /* Pad to the next 32-byte boundary with nop instructions. */
4637 0x90,
4638 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4639 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4640
4641 /* Lazy GOT entries point here (32-byte aligned). */
4642 0x68, /* pushl immediate */
4643 0, 0, 0, 0, /* replaced with reloc offset. */
4644 0xe9, /* jmp relative */
4645 0, 0, 0, 0, /* replaced with offset to .plt. */
4646
4647 /* Pad to the next 32-byte boundary with nop instructions. */
4648 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4649 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4650 0x90, 0x90
4651 };
4652
4653 static const bfd_byte
4654 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4655 {
4656 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4657 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4658 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4659 0xff, 0xe1, /* jmp *%ecx */
4660
4661 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4662 so pad to that size with nop instructions. */
4663 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4664 };
4665
4666 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4667 {
4668 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4669 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4670 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4671 0xff, 0xe1, /* jmp *%ecx */
4672
4673 /* Pad to the next 32-byte boundary with nop instructions. */
4674 0x90,
4675 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4676 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4677
4678 /* Lazy GOT entries point here (32-byte aligned). */
4679 0x68, /* pushl immediate */
4680 0, 0, 0, 0, /* replaced with offset into relocation table. */
4681 0xe9, /* jmp relative */
4682 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4683
4684 /* Pad to the next 32-byte boundary with nop instructions. */
4685 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4686 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4687 0x90, 0x90
4688 };
4689
4690 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4691 {
4692 #if (PLT_CIE_LENGTH != 20 \
4693 || PLT_FDE_LENGTH != 36 \
4694 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4695 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4696 # error "Need PLT_CIE_LENGTH parameters for eh_frame_plt offsets!"
4697 #endif
4698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4699 0, 0, 0, 0, /* CIE ID */
4700 1, /* CIE version */
4701 'z', 'R', 0, /* Augmentation string */
4702 1, /* Code alignment factor */
4703 0x7c, /* Data alignment factor: -4 */
4704 8, /* Return address column */
4705 1, /* Augmentation size */
4706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4709 DW_CFA_nop, DW_CFA_nop,
4710
4711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4714 0, 0, 0, 0, /* .plt size goes here */
4715 0, /* Augmentation size */
4716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4719 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4721 13, /* Block length */
4722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4724 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4726 DW_CFA_nop, DW_CFA_nop
4727 };
4728
4729 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4730 {
4731 elf_i386_nacl_plt0_entry, /* plt0_entry */
4732 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4733 elf_i386_nacl_plt_entry, /* plt_entry */
4734 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4735 NULL, /* plt_tlsdesc_entry */
4736 0, /* plt_tlsdesc_entry_size*/
4737 0, /* plt_tlsdesc_got1_offset */
4738 0, /* plt_tlsdesc_got2_offset */
4739 0, /* plt_tlsdesc_got1_insn_end */
4740 0, /* plt_tlsdesc_got2_insn_end */
4741 2, /* plt0_got1_offset */
4742 8, /* plt0_got2_offset */
4743 0, /* plt0_got2_insn_end */
4744 2, /* plt_got_offset */
4745 33, /* plt_reloc_offset */
4746 38, /* plt_plt_offset */
4747 0, /* plt_got_insn_size */
4748 0, /* plt_plt_insn_end */
4749 32, /* plt_lazy_offset */
4750 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4751 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4752 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4753 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4754 };
4755
4756 static bfd_boolean
4757 elf32_i386_nacl_elf_object_p (bfd *abfd)
4758 {
4759 /* Set the right machine number for a NaCl i386 ELF32 file. */
4760 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4761 return TRUE;
4762 }
4763
4764 #undef ELF_TARGET_OS
4765 #define ELF_TARGET_OS is_nacl
4766
4767 #undef elf_backend_object_p
4768 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4769 #undef elf_backend_modify_segment_map
4770 #define elf_backend_modify_segment_map nacl_modify_segment_map
4771 #undef elf_backend_modify_headers
4772 #define elf_backend_modify_headers nacl_modify_headers
4773 #undef elf_backend_final_write_processing
4774 #define elf_backend_final_write_processing nacl_final_write_processing
4775
4776 #include "elf32-target.h"
4777
4778 /* Restore defaults. */
4779 #undef elf_backend_object_p
4780 #undef elf_backend_modify_segment_map
4781 #undef elf_backend_modify_headers
4782 #undef elf_backend_final_write_processing
4783
4784 /* VxWorks support. */
4785
4786 #undef TARGET_LITTLE_SYM
4787 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4788 #undef TARGET_LITTLE_NAME
4789 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4790 #undef ELF_OSABI
4791 #undef ELF_MAXPAGESIZE
4792 #define ELF_MAXPAGESIZE 0x1000
4793 #undef elf_backend_plt_alignment
4794 #define elf_backend_plt_alignment 4
4795
4796 #undef ELF_TARGET_OS
4797 #define ELF_TARGET_OS is_vxworks
4798
4799 #undef elf_backend_relocs_compatible
4800 #undef elf_backend_add_symbol_hook
4801 #define elf_backend_add_symbol_hook \
4802 elf_vxworks_add_symbol_hook
4803 #undef elf_backend_link_output_symbol_hook
4804 #define elf_backend_link_output_symbol_hook \
4805 elf_vxworks_link_output_symbol_hook
4806 #undef elf_backend_emit_relocs
4807 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4808 #undef elf_backend_final_write_processing
4809 #define elf_backend_final_write_processing \
4810 elf_vxworks_final_write_processing
4811 #undef elf_backend_static_tls_alignment
4812
4813 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4814 define it. */
4815 #undef elf_backend_want_plt_sym
4816 #define elf_backend_want_plt_sym 1
4817
4818 #undef elf32_bed
4819 #define elf32_bed elf32_i386_vxworks_bed
4820
4821 #include "elf32-target.h"
GDB Binutils - Deliverables
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