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gas: Fix ip2k-elf and xstormy16-elf build
[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 /* These are the standard parameters. */
847 static const struct elf_x86_backend_data elf_i386_arch_bed =
848 {
849 is_normal /* os */
850 };
851
852 #define elf_backend_arch_data &elf_i386_arch_bed
853
854 /* Return TRUE if the TLS access code sequence support transition
855 from R_TYPE. */
856
857 static bfd_boolean
858 elf_i386_check_tls_transition (asection *sec,
859 bfd_byte *contents,
860 Elf_Internal_Shdr *symtab_hdr,
861 struct elf_link_hash_entry **sym_hashes,
862 unsigned int r_type,
863 const Elf_Internal_Rela *rel,
864 const Elf_Internal_Rela *relend)
865 {
866 unsigned int val, type, reg;
867 unsigned long r_symndx;
868 struct elf_link_hash_entry *h;
869 bfd_vma offset;
870 bfd_byte *call;
871 bfd_boolean indirect_call;
872
873 offset = rel->r_offset;
874 switch (r_type)
875 {
876 case R_386_TLS_GD:
877 case R_386_TLS_LDM:
878 if (offset < 2 || (rel + 1) >= relend)
879 return FALSE;
880
881 indirect_call = FALSE;
882 call = contents + offset + 4;
883 val = *(call - 5);
884 type = *(call - 6);
885 if (r_type == R_386_TLS_GD)
886 {
887 /* Check transition from GD access model. Only
888 leal foo@tlsgd(,%ebx,1), %eax
889 call ___tls_get_addr@PLT
890 or
891 leal foo@tlsgd(%ebx) %eax
892 call ___tls_get_addr@PLT
893 nop
894 or
895 leal foo@tlsgd(%reg), %eax
896 call *___tls_get_addr@GOT(%reg)
897 which may be converted to
898 addr32 call ___tls_get_addr
899 can transit to different access model. */
900 if ((offset + 10) > sec->size
901 || (type != 0x8d && type != 0x04))
902 return FALSE;
903
904 if (type == 0x04)
905 {
906 /* leal foo@tlsgd(,%ebx,1), %eax
907 call ___tls_get_addr@PLT */
908 if (offset < 3)
909 return FALSE;
910
911 if (*(call - 7) != 0x8d
912 || val != 0x1d
913 || call[0] != 0xe8)
914 return FALSE;
915 }
916 else
917 {
918 /* This must be
919 leal foo@tlsgd(%ebx), %eax
920 call ___tls_get_addr@PLT
921 nop
922 or
923 leal foo@tlsgd(%reg), %eax
924 call *___tls_get_addr@GOT(%reg)
925 which may be converted to
926 addr32 call ___tls_get_addr
927
928 %eax can't be used as the GOT base register since it
929 is used to pass parameter to ___tls_get_addr. */
930 reg = val & 7;
931 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
932 return FALSE;
933
934 indirect_call = call[0] == 0xff;
935 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
936 && !(call[0] == 0x67 && call[1] == 0xe8)
937 && !(indirect_call
938 && (call[1] & 0xf8) == 0x90
939 && (call[1] & 0x7) == reg))
940 return FALSE;
941 }
942 }
943 else
944 {
945 /* Check transition from LD access model. Only
946 leal foo@tlsldm(%ebx), %eax
947 call ___tls_get_addr@PLT
948 or
949 leal foo@tlsldm(%reg), %eax
950 call *___tls_get_addr@GOT(%reg)
951 which may be converted to
952 addr32 call ___tls_get_addr
953 can transit to different access model. */
954 if (type != 0x8d || (offset + 9) > sec->size)
955 return FALSE;
956
957 /* %eax can't be used as the GOT base register since it is
958 used to pass parameter to ___tls_get_addr. */
959 reg = val & 7;
960 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
961 return FALSE;
962
963 indirect_call = call[0] == 0xff;
964 if (!(reg == 3 && call[0] == 0xe8)
965 && !(call[0] == 0x67 && call[1] == 0xe8)
966 && !(indirect_call
967 && (call[1] & 0xf8) == 0x90
968 && (call[1] & 0x7) == reg))
969 return FALSE;
970 }
971
972 r_symndx = ELF32_R_SYM (rel[1].r_info);
973 if (r_symndx < symtab_hdr->sh_info)
974 return FALSE;
975
976 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
977 if (h == NULL
978 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
979 return FALSE;
980 else if (indirect_call)
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
982 else
983 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
984 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
985
986 case R_386_TLS_IE:
987 /* Check transition from IE access model:
988 movl foo@indntpoff(%rip), %eax
989 movl foo@indntpoff(%rip), %reg
990 addl foo@indntpoff(%rip), %reg
991 */
992
993 if (offset < 1 || (offset + 4) > sec->size)
994 return FALSE;
995
996 /* Check "movl foo@tpoff(%rip), %eax" first. */
997 val = bfd_get_8 (abfd, contents + offset - 1);
998 if (val == 0xa1)
999 return TRUE;
1000
1001 if (offset < 2)
1002 return FALSE;
1003
1004 /* Check movl|addl foo@tpoff(%rip), %reg. */
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return ((type == 0x8b || type == 0x03)
1007 && (val & 0xc7) == 0x05);
1008
1009 case R_386_TLS_GOTIE:
1010 case R_386_TLS_IE_32:
1011 /* Check transition from {IE_32,GOTIE} access model:
1012 subl foo@{tpoff,gontoff}(%reg1), %reg2
1013 movl foo@{tpoff,gontoff}(%reg1), %reg2
1014 addl foo@{tpoff,gontoff}(%reg1), %reg2
1015 */
1016
1017 if (offset < 2 || (offset + 4) > sec->size)
1018 return FALSE;
1019
1020 val = bfd_get_8 (abfd, contents + offset - 1);
1021 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1022 return FALSE;
1023
1024 type = bfd_get_8 (abfd, contents + offset - 2);
1025 return type == 0x8b || type == 0x2b || type == 0x03;
1026
1027 case R_386_TLS_GOTDESC:
1028 /* Check transition from GDesc access model:
1029 leal x@tlsdesc(%ebx), %eax
1030
1031 Make sure it's a leal adding ebx to a 32-bit offset
1032 into any register, although it's probably almost always
1033 going to be eax. */
1034
1035 if (offset < 2 || (offset + 4) > sec->size)
1036 return FALSE;
1037
1038 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1039 return FALSE;
1040
1041 val = bfd_get_8 (abfd, contents + offset - 1);
1042 return (val & 0xc7) == 0x83;
1043
1044 case R_386_TLS_DESC_CALL:
1045 /* Check transition from GDesc access model:
1046 call *x@tlsdesc(%eax)
1047 */
1048 if (offset + 2 <= sec->size)
1049 {
1050 /* Make sure that it's a call *x@tlsdesc(%eax). */
1051 call = contents + offset;
1052 return call[0] == 0xff && call[1] == 0x10;
1053 }
1054
1055 return FALSE;
1056
1057 default:
1058 abort ();
1059 }
1060 }
1061
1062 /* Return TRUE if the TLS access transition is OK or no transition
1063 will be performed. Update R_TYPE if there is a transition. */
1064
1065 static bfd_boolean
1066 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1067 asection *sec, bfd_byte *contents,
1068 Elf_Internal_Shdr *symtab_hdr,
1069 struct elf_link_hash_entry **sym_hashes,
1070 unsigned int *r_type, int tls_type,
1071 const Elf_Internal_Rela *rel,
1072 const Elf_Internal_Rela *relend,
1073 struct elf_link_hash_entry *h,
1074 unsigned long r_symndx,
1075 bfd_boolean from_relocate_section)
1076 {
1077 unsigned int from_type = *r_type;
1078 unsigned int to_type = from_type;
1079 bfd_boolean check = TRUE;
1080
1081 /* Skip TLS transition for functions. */
1082 if (h != NULL
1083 && (h->type == STT_FUNC
1084 || h->type == STT_GNU_IFUNC))
1085 return TRUE;
1086
1087 switch (from_type)
1088 {
1089 case R_386_TLS_GD:
1090 case R_386_TLS_GOTDESC:
1091 case R_386_TLS_DESC_CALL:
1092 case R_386_TLS_IE_32:
1093 case R_386_TLS_IE:
1094 case R_386_TLS_GOTIE:
1095 if (bfd_link_executable (info))
1096 {
1097 if (h == NULL)
1098 to_type = R_386_TLS_LE_32;
1099 else if (from_type != R_386_TLS_IE
1100 && from_type != R_386_TLS_GOTIE)
1101 to_type = R_386_TLS_IE_32;
1102 }
1103
1104 /* When we are called from elf_i386_relocate_section, there may
1105 be additional transitions based on TLS_TYPE. */
1106 if (from_relocate_section)
1107 {
1108 unsigned int new_to_type = to_type;
1109
1110 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1111 new_to_type = R_386_TLS_LE_32;
1112
1113 if (to_type == R_386_TLS_GD
1114 || to_type == R_386_TLS_GOTDESC
1115 || to_type == R_386_TLS_DESC_CALL)
1116 {
1117 if (tls_type == GOT_TLS_IE_POS)
1118 new_to_type = R_386_TLS_GOTIE;
1119 else if (tls_type & GOT_TLS_IE)
1120 new_to_type = R_386_TLS_IE_32;
1121 }
1122
1123 /* We checked the transition before when we were called from
1124 elf_i386_check_relocs. We only want to check the new
1125 transition which hasn't been checked before. */
1126 check = new_to_type != to_type && from_type == to_type;
1127 to_type = new_to_type;
1128 }
1129
1130 break;
1131
1132 case R_386_TLS_LDM:
1133 if (bfd_link_executable (info))
1134 to_type = R_386_TLS_LE_32;
1135 break;
1136
1137 default:
1138 return TRUE;
1139 }
1140
1141 /* Return TRUE if there is no transition. */
1142 if (from_type == to_type)
1143 return TRUE;
1144
1145 /* Check if the transition can be performed. */
1146 if (check
1147 && ! elf_i386_check_tls_transition (sec, contents,
1148 symtab_hdr, sym_hashes,
1149 from_type, rel, relend))
1150 {
1151 reloc_howto_type *from, *to;
1152 const char *name;
1153
1154 from = elf_i386_rtype_to_howto (from_type);
1155 to = elf_i386_rtype_to_howto (to_type);
1156
1157 if (h)
1158 name = h->root.root.string;
1159 else
1160 {
1161 struct elf_x86_link_hash_table *htab;
1162
1163 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1164 if (htab == NULL)
1165 name = "*unknown*";
1166 else
1167 {
1168 Elf_Internal_Sym *isym;
1169
1170 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1171 abfd, r_symndx);
1172 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1173 }
1174 }
1175
1176 _bfd_error_handler
1177 /* xgettext:c-format */
1178 (_("%pB: TLS transition from %s to %s against `%s'"
1179 " at %#" PRIx64 " in section `%pA' failed"),
1180 abfd, from->name, to->name, name,
1181 (uint64_t) rel->r_offset, sec);
1182 bfd_set_error (bfd_error_bad_value);
1183 return FALSE;
1184 }
1185
1186 *r_type = to_type;
1187 return TRUE;
1188 }
1189
1190 /* With the local symbol, foo, we convert
1191 mov foo@GOT[(%reg1)], %reg2
1192 to
1193 lea foo[@GOTOFF(%reg1)], %reg2
1194 and convert
1195 call/jmp *foo@GOT[(%reg)]
1196 to
1197 nop call foo/jmp foo nop
1198 When PIC is false, convert
1199 test %reg1, foo@GOT[(%reg2)]
1200 to
1201 test $foo, %reg1
1202 and convert
1203 binop foo@GOT[(%reg1)], %reg2
1204 to
1205 binop $foo, %reg2
1206 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1207 instructions. */
1208
1209 static
1210 bfd_boolean
1211 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1212 bfd_byte *contents,
1213 unsigned int *r_type_p,
1214 Elf_Internal_Rela *irel,
1215 struct elf_link_hash_entry *h,
1216 bfd_boolean *converted,
1217 struct bfd_link_info *link_info)
1218 {
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1221 unsigned int modrm;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1225 unsigned int nop;
1226 bfd_vma nop_offset;
1227 bfd_boolean is_pic;
1228 bfd_boolean to_reloc_32;
1229 bfd_boolean abs_symbol;
1230 unsigned int r_type;
1231 unsigned int r_symndx;
1232 bfd_vma roff = irel->r_offset;
1233 bfd_boolean local_ref;
1234 struct elf_x86_link_hash_entry *eh;
1235
1236 if (roff < 2)
1237 return TRUE;
1238
1239 /* Addend for R_386_GOT32X relocations must be 0. */
1240 addend = bfd_get_32 (abfd, contents + roff);
1241 if (addend != 0)
1242 return TRUE;
1243
1244 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1245 is_pic = bfd_link_pic (link_info);
1246
1247 r_type = *r_type_p;
1248 r_symndx = ELF32_R_SYM (irel->r_info);
1249
1250 modrm = bfd_get_8 (abfd, contents + roff - 1);
1251 baseless = (modrm & 0xc7) == 0x5;
1252
1253 if (h)
1254 {
1255 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1256 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1257 isym = NULL;
1258 abs_symbol = ABS_SYMBOL_P (h);
1259 }
1260 else
1261 {
1262 local_ref = TRUE;
1263 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1264 r_symndx);
1265 abs_symbol = isym->st_shndx == SHN_ABS;
1266 }
1267
1268 if (baseless && is_pic)
1269 {
1270 /* For PIC, disallow R_386_GOT32X without a base register
1271 since we don't know what the GOT base is. */
1272 const char *name;
1273
1274 if (h == NULL)
1275 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1276 else
1277 name = h->root.root.string;
1278
1279 _bfd_error_handler
1280 /* xgettext:c-format */
1281 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1282 " register can not be used when making a shared object"),
1283 abfd, name);
1284 return FALSE;
1285 }
1286
1287 opcode = bfd_get_8 (abfd, contents + roff - 2);
1288
1289 /* Convert to R_386_32 if PIC is false or there is no base
1290 register. */
1291 to_reloc_32 = !is_pic || baseless;
1292
1293 eh = elf_x86_hash_entry (h);
1294
1295 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1296 reloc. */
1297 if (h == NULL)
1298 {
1299 if (opcode == 0x0ff)
1300 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1301 goto convert_branch;
1302 else
1303 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1304 "test %reg1, foo@GOT(%reg2)" and
1305 "binop foo@GOT[(%reg1)], %reg2". */
1306 goto convert_load;
1307 }
1308
1309 /* Undefined weak symbol is only bound locally in executable
1310 and its reference is resolved as 0. */
1311 if (h->root.type == bfd_link_hash_undefweak
1312 && !eh->linker_def
1313 && local_ref)
1314 {
1315 if (opcode == 0xff)
1316 {
1317 /* No direct branch to 0 for PIC. */
1318 if (is_pic)
1319 return TRUE;
1320 else
1321 goto convert_branch;
1322 }
1323 else
1324 {
1325 /* We can convert load of address 0 to R_386_32. */
1326 to_reloc_32 = TRUE;
1327 goto convert_load;
1328 }
1329 }
1330
1331 if (opcode == 0xff)
1332 {
1333 /* We have "call/jmp *foo@GOT[(%reg)]". */
1334 if ((h->root.type == bfd_link_hash_defined
1335 || h->root.type == bfd_link_hash_defweak)
1336 && local_ref)
1337 {
1338 /* The function is locally defined. */
1339 convert_branch:
1340 /* Convert R_386_GOT32X to R_386_PC32. */
1341 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1342 {
1343 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1344 is a nop prefix. */
1345 modrm = 0xe8;
1346 /* To support TLS optimization, always use addr32 prefix
1347 for "call *___tls_get_addr@GOT(%reg)". */
1348 if (eh && eh->tls_get_addr)
1349 {
1350 nop = 0x67;
1351 nop_offset = irel->r_offset - 2;
1352 }
1353 else
1354 {
1355 nop = htab->params->call_nop_byte;
1356 if (htab->params->call_nop_as_suffix)
1357 {
1358 nop_offset = roff + 3;
1359 irel->r_offset -= 1;
1360 }
1361 else
1362 nop_offset = roff - 2;
1363 }
1364 }
1365 else
1366 {
1367 /* Convert to "jmp foo nop". */
1368 modrm = 0xe9;
1369 nop = NOP_OPCODE;
1370 nop_offset = roff + 3;
1371 irel->r_offset -= 1;
1372 }
1373
1374 bfd_put_8 (abfd, nop, contents + nop_offset);
1375 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1376 /* When converting to PC-relative relocation, we
1377 need to adjust addend by -4. */
1378 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1379 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1380 *r_type_p = R_386_PC32;
1381 *converted = TRUE;
1382 }
1383 }
1384 else
1385 {
1386 /* We have "mov foo@GOT[(%re1g)], %reg2",
1387 "test %reg1, foo@GOT(%reg2)" and
1388 "binop foo@GOT[(%reg1)], %reg2".
1389
1390 Avoid optimizing _DYNAMIC since ld.so may use its
1391 link-time address. */
1392 if (h == htab->elf.hdynamic)
1393 return TRUE;
1394
1395 /* def_regular is set by an assignment in a linker script in
1396 bfd_elf_record_link_assignment. start_stop is set on
1397 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1398 if (h->start_stop
1399 || eh->linker_def
1400 || ((h->def_regular
1401 || h->root.type == bfd_link_hash_defined
1402 || h->root.type == bfd_link_hash_defweak)
1403 && local_ref))
1404 {
1405 convert_load:
1406 if (opcode == 0x8b)
1407 {
1408 if (abs_symbol && local_ref)
1409 to_reloc_32 = TRUE;
1410
1411 if (to_reloc_32)
1412 {
1413 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1414 "mov $foo, %reg2" with R_386_32. */
1415 r_type = R_386_32;
1416 modrm = 0xc0 | (modrm & 0x38) >> 3;
1417 bfd_put_8 (abfd, modrm, contents + roff - 1);
1418 opcode = 0xc7;
1419 }
1420 else
1421 {
1422 /* Convert "mov foo@GOT(%reg1), %reg2" to
1423 "lea foo@GOTOFF(%reg1), %reg2". */
1424 r_type = R_386_GOTOFF;
1425 opcode = 0x8d;
1426 }
1427 }
1428 else
1429 {
1430 /* Only R_386_32 is supported. */
1431 if (!to_reloc_32)
1432 return TRUE;
1433
1434 if (opcode == 0x85)
1435 {
1436 /* Convert "test %reg1, foo@GOT(%reg2)" to
1437 "test $foo, %reg1". */
1438 modrm = 0xc0 | (modrm & 0x38) >> 3;
1439 opcode = 0xf7;
1440 }
1441 else
1442 {
1443 /* Convert "binop foo@GOT(%reg1), %reg2" to
1444 "binop $foo, %reg2". */
1445 modrm = (0xc0
1446 | (modrm & 0x38) >> 3
1447 | (opcode & 0x3c));
1448 opcode = 0x81;
1449 }
1450 bfd_put_8 (abfd, modrm, contents + roff - 1);
1451 r_type = R_386_32;
1452 }
1453
1454 bfd_put_8 (abfd, opcode, contents + roff - 2);
1455 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1456 *r_type_p = r_type;
1457 *converted = TRUE;
1458 }
1459 }
1460
1461 return TRUE;
1462 }
1463
1464 /* Rename some of the generic section flags to better document how they
1465 are used here. */
1466 #define check_relocs_failed sec_flg0
1467
1468 /* Look through the relocs for a section during the first phase, and
1469 calculate needed space in the global offset table, procedure linkage
1470 table, and dynamic reloc sections. */
1471
1472 static bfd_boolean
1473 elf_i386_check_relocs (bfd *abfd,
1474 struct bfd_link_info *info,
1475 asection *sec,
1476 const Elf_Internal_Rela *relocs)
1477 {
1478 struct elf_x86_link_hash_table *htab;
1479 Elf_Internal_Shdr *symtab_hdr;
1480 struct elf_link_hash_entry **sym_hashes;
1481 const Elf_Internal_Rela *rel;
1482 const Elf_Internal_Rela *rel_end;
1483 asection *sreloc;
1484 bfd_byte *contents;
1485 bfd_boolean converted;
1486
1487 if (bfd_link_relocatable (info))
1488 return TRUE;
1489
1490 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1491 if (htab == NULL)
1492 {
1493 sec->check_relocs_failed = 1;
1494 return FALSE;
1495 }
1496
1497 BFD_ASSERT (is_x86_elf (abfd, htab));
1498
1499 /* Get the section contents. */
1500 if (elf_section_data (sec)->this_hdr.contents != NULL)
1501 contents = elf_section_data (sec)->this_hdr.contents;
1502 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1503 {
1504 sec->check_relocs_failed = 1;
1505 return FALSE;
1506 }
1507
1508 symtab_hdr = &elf_symtab_hdr (abfd);
1509 sym_hashes = elf_sym_hashes (abfd);
1510
1511 converted = FALSE;
1512
1513 sreloc = NULL;
1514
1515 rel_end = relocs + sec->reloc_count;
1516 for (rel = relocs; rel < rel_end; rel++)
1517 {
1518 unsigned int r_type;
1519 unsigned int r_symndx;
1520 struct elf_link_hash_entry *h;
1521 struct elf_x86_link_hash_entry *eh;
1522 Elf_Internal_Sym *isym;
1523 const char *name;
1524 bfd_boolean size_reloc;
1525 bfd_boolean no_dynreloc;
1526
1527 r_symndx = ELF32_R_SYM (rel->r_info);
1528 r_type = ELF32_R_TYPE (rel->r_info);
1529
1530 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1531 {
1532 /* xgettext:c-format */
1533 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1534 abfd, r_symndx);
1535 goto error_return;
1536 }
1537
1538 if (r_symndx < symtab_hdr->sh_info)
1539 {
1540 /* A local symbol. */
1541 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1542 abfd, r_symndx);
1543 if (isym == NULL)
1544 goto error_return;
1545
1546 /* Check relocation against local STT_GNU_IFUNC symbol. */
1547 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1548 {
1549 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1550 if (h == NULL)
1551 goto error_return;
1552
1553 /* Fake a STT_GNU_IFUNC symbol. */
1554 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1555 isym, NULL);
1556 h->type = STT_GNU_IFUNC;
1557 h->def_regular = 1;
1558 h->ref_regular = 1;
1559 h->forced_local = 1;
1560 h->root.type = bfd_link_hash_defined;
1561 }
1562 else
1563 h = NULL;
1564 }
1565 else
1566 {
1567 isym = NULL;
1568 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1569 while (h->root.type == bfd_link_hash_indirect
1570 || h->root.type == bfd_link_hash_warning)
1571 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1572 }
1573
1574 eh = (struct elf_x86_link_hash_entry *) h;
1575 if (h != NULL)
1576 {
1577 if (r_type == R_386_GOTOFF)
1578 eh->gotoff_ref = 1;
1579
1580 /* It is referenced by a non-shared object. */
1581 h->ref_regular = 1;
1582 }
1583
1584 if (r_type == R_386_GOT32X
1585 && (h == NULL || h->type != STT_GNU_IFUNC))
1586 {
1587 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1588 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1589 &r_type, irel, h,
1590 &converted, info))
1591 goto error_return;
1592 }
1593
1594 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1595 symtab_hdr, &no_dynreloc))
1596 return FALSE;
1597
1598 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1599 symtab_hdr, sym_hashes,
1600 &r_type, GOT_UNKNOWN,
1601 rel, rel_end, h, r_symndx, FALSE))
1602 goto error_return;
1603
1604 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1605 if (h == htab->elf.hgot)
1606 htab->got_referenced = TRUE;
1607
1608 switch (r_type)
1609 {
1610 case R_386_TLS_LDM:
1611 htab->tls_ld_or_ldm_got.refcount = 1;
1612 goto create_got;
1613
1614 case R_386_PLT32:
1615 /* This symbol requires a procedure linkage table entry. We
1616 actually build the entry in adjust_dynamic_symbol,
1617 because this might be a case of linking PIC code which is
1618 never referenced by a dynamic object, in which case we
1619 don't need to generate a procedure linkage table entry
1620 after all. */
1621
1622 /* If this is a local symbol, we resolve it directly without
1623 creating a procedure linkage table entry. */
1624 if (h == NULL)
1625 continue;
1626
1627 eh->zero_undefweak &= 0x2;
1628 h->needs_plt = 1;
1629 h->plt.refcount = 1;
1630 break;
1631
1632 case R_386_SIZE32:
1633 size_reloc = TRUE;
1634 goto do_size;
1635
1636 case R_386_TLS_IE_32:
1637 case R_386_TLS_IE:
1638 case R_386_TLS_GOTIE:
1639 if (!bfd_link_executable (info))
1640 info->flags |= DF_STATIC_TLS;
1641 /* Fall through */
1642
1643 case R_386_GOT32:
1644 case R_386_GOT32X:
1645 case R_386_TLS_GD:
1646 case R_386_TLS_GOTDESC:
1647 case R_386_TLS_DESC_CALL:
1648 /* This symbol requires a global offset table entry. */
1649 {
1650 int tls_type, old_tls_type;
1651
1652 switch (r_type)
1653 {
1654 default:
1655 case R_386_GOT32:
1656 case R_386_GOT32X:
1657 tls_type = GOT_NORMAL;
1658 break;
1659 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1660 case R_386_TLS_GOTDESC:
1661 case R_386_TLS_DESC_CALL:
1662 tls_type = GOT_TLS_GDESC; break;
1663 case R_386_TLS_IE_32:
1664 if (ELF32_R_TYPE (rel->r_info) == r_type)
1665 tls_type = GOT_TLS_IE_NEG;
1666 else
1667 /* If this is a GD->IE transition, we may use either of
1668 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1669 tls_type = GOT_TLS_IE;
1670 break;
1671 case R_386_TLS_IE:
1672 case R_386_TLS_GOTIE:
1673 tls_type = GOT_TLS_IE_POS; break;
1674 }
1675
1676 if (h != NULL)
1677 {
1678 h->got.refcount = 1;
1679 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1680 }
1681 else
1682 {
1683 bfd_signed_vma *local_got_refcounts;
1684
1685 /* This is a global offset table entry for a local symbol. */
1686 local_got_refcounts = elf_local_got_refcounts (abfd);
1687 if (local_got_refcounts == NULL)
1688 {
1689 bfd_size_type size;
1690
1691 size = symtab_hdr->sh_info;
1692 size *= (sizeof (bfd_signed_vma)
1693 + sizeof (bfd_vma) + sizeof(char));
1694 local_got_refcounts = (bfd_signed_vma *)
1695 bfd_zalloc (abfd, size);
1696 if (local_got_refcounts == NULL)
1697 goto error_return;
1698 elf_local_got_refcounts (abfd) = local_got_refcounts;
1699 elf_x86_local_tlsdesc_gotent (abfd)
1700 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1701 elf_x86_local_got_tls_type (abfd)
1702 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1703 }
1704 local_got_refcounts[r_symndx] = 1;
1705 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1706 }
1707
1708 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1709 tls_type |= old_tls_type;
1710 /* If a TLS symbol is accessed using IE at least once,
1711 there is no point to use dynamic model for it. */
1712 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1713 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1714 || (tls_type & GOT_TLS_IE) == 0))
1715 {
1716 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1717 tls_type = old_tls_type;
1718 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1719 && GOT_TLS_GD_ANY_P (tls_type))
1720 tls_type |= old_tls_type;
1721 else
1722 {
1723 if (h)
1724 name = h->root.root.string;
1725 else
1726 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1727 NULL);
1728 _bfd_error_handler
1729 /* xgettext:c-format */
1730 (_("%pB: `%s' accessed both as normal and "
1731 "thread local symbol"),
1732 abfd, name);
1733 bfd_set_error (bfd_error_bad_value);
1734 goto error_return;
1735 }
1736 }
1737
1738 if (old_tls_type != tls_type)
1739 {
1740 if (h != NULL)
1741 elf_x86_hash_entry (h)->tls_type = tls_type;
1742 else
1743 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1744 }
1745 }
1746 /* Fall through */
1747
1748 case R_386_GOTOFF:
1749 case R_386_GOTPC:
1750 create_got:
1751 if (r_type != R_386_TLS_IE)
1752 {
1753 if (eh != NULL)
1754 {
1755 eh->zero_undefweak &= 0x2;
1756
1757 /* Need GOT to resolve undefined weak symbol to 0. */
1758 if (r_type == R_386_GOTOFF
1759 && h->root.type == bfd_link_hash_undefweak
1760 && bfd_link_executable (info))
1761 htab->got_referenced = TRUE;
1762 }
1763 break;
1764 }
1765 /* Fall through */
1766
1767 case R_386_TLS_LE_32:
1768 case R_386_TLS_LE:
1769 if (eh != NULL)
1770 eh->zero_undefweak &= 0x2;
1771 if (bfd_link_executable (info))
1772 break;
1773 info->flags |= DF_STATIC_TLS;
1774 goto do_relocation;
1775
1776 case R_386_32:
1777 case R_386_PC32:
1778 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1779 eh->zero_undefweak |= 0x2;
1780 do_relocation:
1781 /* We are called after all symbols have been resolved. Only
1782 relocation against STT_GNU_IFUNC symbol must go through
1783 PLT. */
1784 if (h != NULL
1785 && (bfd_link_executable (info)
1786 || h->type == STT_GNU_IFUNC))
1787 {
1788 bfd_boolean func_pointer_ref = FALSE;
1789
1790 if (r_type == R_386_PC32)
1791 {
1792 /* Since something like ".long foo - ." may be used
1793 as pointer, make sure that PLT is used if foo is
1794 a function defined in a shared library. */
1795 if ((sec->flags & SEC_CODE) == 0)
1796 h->pointer_equality_needed = 1;
1797 else if (h->type == STT_GNU_IFUNC
1798 && bfd_link_pic (info))
1799 {
1800 _bfd_error_handler
1801 /* xgettext:c-format */
1802 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1803 abfd, h->root.root.string);
1804 bfd_set_error (bfd_error_bad_value);
1805 goto error_return;
1806 }
1807 }
1808 else
1809 {
1810 h->pointer_equality_needed = 1;
1811 /* R_386_32 can be resolved at run-time. */
1812 if (r_type == R_386_32
1813 && (sec->flags & SEC_READONLY) == 0)
1814 func_pointer_ref = TRUE;
1815 }
1816
1817 if (!func_pointer_ref)
1818 {
1819 /* If this reloc is in a read-only section, we might
1820 need a copy reloc. We can't check reliably at this
1821 stage whether the section is read-only, as input
1822 sections have not yet been mapped to output sections.
1823 Tentatively set the flag for now, and correct in
1824 adjust_dynamic_symbol. */
1825 h->non_got_ref = 1;
1826
1827 /* We may need a .plt entry if the symbol is a function
1828 defined in a shared lib or is a function referenced
1829 from the code or read-only section. */
1830 if (!h->def_regular
1831 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1832 h->plt.refcount = 1;
1833 }
1834 }
1835
1836 size_reloc = FALSE;
1837 do_size:
1838 if (!no_dynreloc
1839 && NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1840 R_386_32))
1841 {
1842 struct elf_dyn_relocs *p;
1843 struct elf_dyn_relocs **head;
1844
1845 /* We must copy these reloc types into the output file.
1846 Create a reloc section in dynobj and make room for
1847 this reloc. */
1848 if (sreloc == NULL)
1849 {
1850 sreloc = _bfd_elf_make_dynamic_reloc_section
1851 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1852
1853 if (sreloc == NULL)
1854 goto error_return;
1855 }
1856
1857 /* If this is a global symbol, we count the number of
1858 relocations we need for this symbol. */
1859 if (h != NULL)
1860 {
1861 head = &h->dyn_relocs;
1862 }
1863 else
1864 {
1865 /* Track dynamic relocs needed for local syms too.
1866 We really need local syms available to do this
1867 easily. Oh well. */
1868 void **vpp;
1869 asection *s;
1870
1871 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1872 abfd, r_symndx);
1873 if (isym == NULL)
1874 goto error_return;
1875
1876 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1877 if (s == NULL)
1878 s = sec;
1879
1880 vpp = &elf_section_data (s)->local_dynrel;
1881 head = (struct elf_dyn_relocs **)vpp;
1882 }
1883
1884 p = *head;
1885 if (p == NULL || p->sec != sec)
1886 {
1887 size_t amt = sizeof *p;
1888 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1889 amt);
1890 if (p == NULL)
1891 goto error_return;
1892 p->next = *head;
1893 *head = p;
1894 p->sec = sec;
1895 p->count = 0;
1896 p->pc_count = 0;
1897 }
1898
1899 p->count += 1;
1900 /* Count size relocation as PC-relative relocation. */
1901 if (r_type == R_386_PC32 || size_reloc)
1902 p->pc_count += 1;
1903 }
1904 break;
1905
1906 /* This relocation describes the C++ object vtable hierarchy.
1907 Reconstruct it for later use during GC. */
1908 case R_386_GNU_VTINHERIT:
1909 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1910 goto error_return;
1911 break;
1912
1913 /* This relocation describes which C++ vtable entries are actually
1914 used. Record for later use during GC. */
1915 case R_386_GNU_VTENTRY:
1916 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1917 goto error_return;
1918 break;
1919
1920 default:
1921 break;
1922 }
1923 }
1924
1925 if (elf_section_data (sec)->this_hdr.contents != contents)
1926 {
1927 if (!converted && !info->keep_memory)
1928 free (contents);
1929 else
1930 {
1931 /* Cache the section contents for elf_link_input_bfd if any
1932 load is converted or --no-keep-memory isn't used. */
1933 elf_section_data (sec)->this_hdr.contents = contents;
1934 }
1935 }
1936
1937 /* Cache relocations if any load is converted. */
1938 if (elf_section_data (sec)->relocs != relocs && converted)
1939 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1940
1941 return TRUE;
1942
1943 error_return:
1944 if (elf_section_data (sec)->this_hdr.contents != contents)
1945 free (contents);
1946 sec->check_relocs_failed = 1;
1947 return FALSE;
1948 }
1949
1950 /* Set the correct type for an x86 ELF section. We do this by the
1951 section name, which is a hack, but ought to work. */
1952
1953 static bfd_boolean
1954 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1955 Elf_Internal_Shdr *hdr,
1956 asection *sec)
1957 {
1958 const char *name;
1959
1960 name = bfd_section_name (sec);
1961
1962 /* This is an ugly, but unfortunately necessary hack that is
1963 needed when producing EFI binaries on x86. It tells
1964 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1965 containing ELF relocation info. We need this hack in order to
1966 be able to generate ELF binaries that can be translated into
1967 EFI applications (which are essentially COFF objects). Those
1968 files contain a COFF ".reloc" section inside an ELFNN object,
1969 which would normally cause BFD to segfault because it would
1970 attempt to interpret this section as containing relocation
1971 entries for section "oc". With this hack enabled, ".reloc"
1972 will be treated as a normal data section, which will avoid the
1973 segfault. However, you won't be able to create an ELFNN binary
1974 with a section named "oc" that needs relocations, but that's
1975 the kind of ugly side-effects you get when detecting section
1976 types based on their names... In practice, this limitation is
1977 unlikely to bite. */
1978 if (strcmp (name, ".reloc") == 0)
1979 hdr->sh_type = SHT_PROGBITS;
1980
1981 return TRUE;
1982 }
1983
1984 /* Return the relocation value for @tpoff relocation
1985 if STT_TLS virtual address is ADDRESS. */
1986
1987 static bfd_vma
1988 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1989 {
1990 struct elf_link_hash_table *htab = elf_hash_table (info);
1991 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1992 bfd_vma static_tls_size;
1993
1994 /* If tls_sec is NULL, we should have signalled an error already. */
1995 if (htab->tls_sec == NULL)
1996 return 0;
1997
1998 /* Consider special static TLS alignment requirements. */
1999 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2000 return static_tls_size + htab->tls_sec->vma - address;
2001 }
2002
2003 /* Relocate an i386 ELF section. */
2004
2005 static bfd_boolean
2006 elf_i386_relocate_section (bfd *output_bfd,
2007 struct bfd_link_info *info,
2008 bfd *input_bfd,
2009 asection *input_section,
2010 bfd_byte *contents,
2011 Elf_Internal_Rela *relocs,
2012 Elf_Internal_Sym *local_syms,
2013 asection **local_sections)
2014 {
2015 struct elf_x86_link_hash_table *htab;
2016 Elf_Internal_Shdr *symtab_hdr;
2017 struct elf_link_hash_entry **sym_hashes;
2018 bfd_vma *local_got_offsets;
2019 bfd_vma *local_tlsdesc_gotents;
2020 Elf_Internal_Rela *rel;
2021 Elf_Internal_Rela *wrel;
2022 Elf_Internal_Rela *relend;
2023 bfd_boolean is_vxworks_tls;
2024 unsigned plt_entry_size;
2025
2026 /* Skip if check_relocs failed. */
2027 if (input_section->check_relocs_failed)
2028 return FALSE;
2029
2030 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2031 if (htab == NULL)
2032 return FALSE;
2033
2034 if (!is_x86_elf (input_bfd, htab))
2035 {
2036 bfd_set_error (bfd_error_wrong_format);
2037 return FALSE;
2038 }
2039
2040 symtab_hdr = &elf_symtab_hdr (input_bfd);
2041 sym_hashes = elf_sym_hashes (input_bfd);
2042 local_got_offsets = elf_local_got_offsets (input_bfd);
2043 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2044 /* We have to handle relocations in vxworks .tls_vars sections
2045 specially, because the dynamic loader is 'weird'. */
2046 is_vxworks_tls = (htab->target_os == is_vxworks
2047 && bfd_link_pic (info)
2048 && !strcmp (input_section->output_section->name,
2049 ".tls_vars"));
2050
2051 _bfd_x86_elf_set_tls_module_base (info);
2052
2053 plt_entry_size = htab->plt.plt_entry_size;
2054
2055 rel = wrel = relocs;
2056 relend = relocs + input_section->reloc_count;
2057 for (; rel < relend; wrel++, rel++)
2058 {
2059 unsigned int r_type, r_type_tls;
2060 reloc_howto_type *howto;
2061 unsigned long r_symndx;
2062 struct elf_link_hash_entry *h;
2063 struct elf_x86_link_hash_entry *eh;
2064 Elf_Internal_Sym *sym;
2065 asection *sec;
2066 bfd_vma off, offplt, plt_offset;
2067 bfd_vma relocation;
2068 bfd_boolean unresolved_reloc;
2069 bfd_reloc_status_type r;
2070 unsigned int indx;
2071 int tls_type;
2072 bfd_vma st_size;
2073 asection *resolved_plt;
2074 bfd_boolean resolved_to_zero;
2075 bfd_boolean relative_reloc;
2076
2077 r_type = ELF32_R_TYPE (rel->r_info);
2078 if (r_type == R_386_GNU_VTINHERIT
2079 || r_type == R_386_GNU_VTENTRY)
2080 {
2081 if (wrel != rel)
2082 *wrel = *rel;
2083 continue;
2084 }
2085
2086 howto = elf_i386_rtype_to_howto (r_type);
2087 if (howto == NULL)
2088 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2089
2090 r_symndx = ELF32_R_SYM (rel->r_info);
2091 h = NULL;
2092 sym = NULL;
2093 sec = NULL;
2094 unresolved_reloc = FALSE;
2095 if (r_symndx < symtab_hdr->sh_info)
2096 {
2097 sym = local_syms + r_symndx;
2098 sec = local_sections[r_symndx];
2099 relocation = (sec->output_section->vma
2100 + sec->output_offset
2101 + sym->st_value);
2102 st_size = sym->st_size;
2103
2104 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2105 && ((sec->flags & SEC_MERGE) != 0
2106 || (bfd_link_relocatable (info)
2107 && sec->output_offset != 0)))
2108 {
2109 bfd_vma addend;
2110 bfd_byte *where = contents + rel->r_offset;
2111
2112 switch (howto->size)
2113 {
2114 case 0:
2115 addend = bfd_get_8 (input_bfd, where);
2116 if (howto->pc_relative)
2117 {
2118 addend = (addend ^ 0x80) - 0x80;
2119 addend += 1;
2120 }
2121 break;
2122 case 1:
2123 addend = bfd_get_16 (input_bfd, where);
2124 if (howto->pc_relative)
2125 {
2126 addend = (addend ^ 0x8000) - 0x8000;
2127 addend += 2;
2128 }
2129 break;
2130 case 2:
2131 addend = bfd_get_32 (input_bfd, where);
2132 if (howto->pc_relative)
2133 {
2134 addend = (addend ^ 0x80000000) - 0x80000000;
2135 addend += 4;
2136 }
2137 break;
2138 default:
2139 abort ();
2140 }
2141
2142 if (bfd_link_relocatable (info))
2143 addend += sec->output_offset;
2144 else
2145 {
2146 asection *msec = sec;
2147 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2148 addend);
2149 addend -= relocation;
2150 addend += msec->output_section->vma + msec->output_offset;
2151 }
2152
2153 switch (howto->size)
2154 {
2155 case 0:
2156 /* FIXME: overflow checks. */
2157 if (howto->pc_relative)
2158 addend -= 1;
2159 bfd_put_8 (input_bfd, addend, where);
2160 break;
2161 case 1:
2162 if (howto->pc_relative)
2163 addend -= 2;
2164 bfd_put_16 (input_bfd, addend, where);
2165 break;
2166 case 2:
2167 if (howto->pc_relative)
2168 addend -= 4;
2169 bfd_put_32 (input_bfd, addend, where);
2170 break;
2171 }
2172 }
2173 else if (!bfd_link_relocatable (info)
2174 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2175 {
2176 /* Relocate against local STT_GNU_IFUNC symbol. */
2177 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2178 FALSE);
2179 if (h == NULL)
2180 abort ();
2181
2182 /* Set STT_GNU_IFUNC symbol value. */
2183 h->root.u.def.value = sym->st_value;
2184 h->root.u.def.section = sec;
2185 }
2186 }
2187 else
2188 {
2189 bfd_boolean warned ATTRIBUTE_UNUSED;
2190 bfd_boolean ignored ATTRIBUTE_UNUSED;
2191
2192 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2193 r_symndx, symtab_hdr, sym_hashes,
2194 h, sec, relocation,
2195 unresolved_reloc, warned, ignored);
2196 st_size = h->size;
2197 }
2198
2199 if (sec != NULL && discarded_section (sec))
2200 {
2201 _bfd_clear_contents (howto, input_bfd, input_section,
2202 contents, rel->r_offset);
2203 wrel->r_offset = rel->r_offset;
2204 wrel->r_info = 0;
2205 wrel->r_addend = 0;
2206
2207 /* For ld -r, remove relocations in debug sections against
2208 sections defined in discarded sections. Not done for
2209 eh_frame editing code expects to be present. */
2210 if (bfd_link_relocatable (info)
2211 && (input_section->flags & SEC_DEBUGGING))
2212 wrel--;
2213
2214 continue;
2215 }
2216
2217 if (bfd_link_relocatable (info))
2218 {
2219 if (wrel != rel)
2220 *wrel = *rel;
2221 continue;
2222 }
2223
2224 eh = (struct elf_x86_link_hash_entry *) h;
2225
2226 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2227 it here if it is defined in a non-shared object. */
2228 if (h != NULL
2229 && h->type == STT_GNU_IFUNC
2230 && h->def_regular)
2231 {
2232 asection *gotplt, *base_got;
2233 bfd_vma plt_index;
2234 const char *name;
2235
2236 if ((input_section->flags & SEC_ALLOC) == 0)
2237 {
2238 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2239 STT_GNU_IFUNC symbol as STT_FUNC. */
2240 if (elf_section_type (input_section) == SHT_NOTE)
2241 goto skip_ifunc;
2242 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2243 sections because such sections are not SEC_ALLOC and
2244 thus ld.so will not process them. */
2245 if ((input_section->flags & SEC_DEBUGGING) != 0)
2246 continue;
2247 abort ();
2248 }
2249
2250 /* STT_GNU_IFUNC symbol must go through PLT. */
2251 if (htab->elf.splt != NULL)
2252 {
2253 if (htab->plt_second != NULL)
2254 {
2255 resolved_plt = htab->plt_second;
2256 plt_offset = eh->plt_second.offset;
2257 }
2258 else
2259 {
2260 resolved_plt = htab->elf.splt;
2261 plt_offset = h->plt.offset;
2262 }
2263 gotplt = htab->elf.sgotplt;
2264 }
2265 else
2266 {
2267 resolved_plt = htab->elf.iplt;
2268 plt_offset = h->plt.offset;
2269 gotplt = htab->elf.igotplt;
2270 }
2271
2272 switch (r_type)
2273 {
2274 default:
2275 break;
2276
2277 case R_386_GOT32:
2278 case R_386_GOT32X:
2279 base_got = htab->elf.sgot;
2280 off = h->got.offset;
2281
2282 if (base_got == NULL)
2283 abort ();
2284
2285 if (off == (bfd_vma) -1)
2286 {
2287 /* We can't use h->got.offset here to save state, or
2288 even just remember the offset, as finish_dynamic_symbol
2289 would use that as offset into .got. */
2290
2291 if (h->plt.offset == (bfd_vma) -1)
2292 abort ();
2293
2294 if (htab->elf.splt != NULL)
2295 {
2296 plt_index = (h->plt.offset / plt_entry_size
2297 - htab->plt.has_plt0);
2298 off = (plt_index + 3) * 4;
2299 base_got = htab->elf.sgotplt;
2300 }
2301 else
2302 {
2303 plt_index = h->plt.offset / plt_entry_size;
2304 off = plt_index * 4;
2305 base_got = htab->elf.igotplt;
2306 }
2307
2308 if (h->dynindx == -1
2309 || h->forced_local
2310 || info->symbolic)
2311 {
2312 /* This references the local defitionion. We must
2313 initialize this entry in the global offset table.
2314 Since the offset must always be a multiple of 8,
2315 we use the least significant bit to record
2316 whether we have initialized it already.
2317
2318 When doing a dynamic link, we create a .rela.got
2319 relocation entry to initialize the value. This
2320 is done in the finish_dynamic_symbol routine. */
2321 if ((off & 1) != 0)
2322 off &= ~1;
2323 else
2324 {
2325 bfd_put_32 (output_bfd, relocation,
2326 base_got->contents + off);
2327 h->got.offset |= 1;
2328 }
2329 }
2330
2331 relocation = off;
2332 }
2333 else
2334 relocation = (base_got->output_section->vma
2335 + base_got->output_offset + off
2336 - gotplt->output_section->vma
2337 - gotplt->output_offset);
2338
2339 if (rel->r_offset > 1
2340 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2341 && *(contents + rel->r_offset - 2) != 0x8d)
2342 {
2343 if (bfd_link_pic (info))
2344 goto disallow_got32;
2345
2346 /* Add the GOT base if there is no base register. */
2347 relocation += (gotplt->output_section->vma
2348 + gotplt->output_offset);
2349 }
2350 else if (htab->elf.splt == NULL)
2351 {
2352 /* Adjust for static executables. */
2353 relocation += gotplt->output_offset;
2354 }
2355
2356 goto do_relocation;
2357 }
2358
2359 if (h->plt.offset == (bfd_vma) -1)
2360 {
2361 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2362 if (r_type == R_386_32
2363 && (input_section->flags & SEC_CODE) == 0)
2364 goto do_ifunc_pointer;
2365 goto bad_ifunc_reloc;
2366 }
2367
2368 relocation = (resolved_plt->output_section->vma
2369 + resolved_plt->output_offset + plt_offset);
2370
2371 switch (r_type)
2372 {
2373 default:
2374 bad_ifunc_reloc:
2375 if (h->root.root.string)
2376 name = h->root.root.string;
2377 else
2378 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2379 NULL);
2380 _bfd_error_handler
2381 /* xgettext:c-format */
2382 (_("%pB: relocation %s against STT_GNU_IFUNC "
2383 "symbol `%s' isn't supported"), input_bfd,
2384 howto->name, name);
2385 bfd_set_error (bfd_error_bad_value);
2386 return FALSE;
2387
2388 case R_386_32:
2389 /* Generate dynamic relcoation only when there is a
2390 non-GOT reference in a shared object. */
2391 if ((bfd_link_pic (info) && h->non_got_ref)
2392 || h->plt.offset == (bfd_vma) -1)
2393 {
2394 Elf_Internal_Rela outrel;
2395 asection *sreloc;
2396 bfd_vma offset;
2397
2398 do_ifunc_pointer:
2399 /* Need a dynamic relocation to get the real function
2400 adddress. */
2401 offset = _bfd_elf_section_offset (output_bfd,
2402 info,
2403 input_section,
2404 rel->r_offset);
2405 if (offset == (bfd_vma) -1
2406 || offset == (bfd_vma) -2)
2407 abort ();
2408
2409 outrel.r_offset = (input_section->output_section->vma
2410 + input_section->output_offset
2411 + offset);
2412
2413 if (POINTER_LOCAL_IFUNC_P (info, h))
2414 {
2415 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2416 h->root.root.string,
2417 h->root.u.def.section->owner);
2418
2419 /* This symbol is resolved locally. */
2420 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2421 bfd_put_32 (output_bfd,
2422 (h->root.u.def.value
2423 + h->root.u.def.section->output_section->vma
2424 + h->root.u.def.section->output_offset),
2425 contents + offset);
2426 }
2427 else
2428 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2429
2430 /* Dynamic relocations are stored in
2431 1. .rel.ifunc section in PIC object.
2432 2. .rel.got section in dynamic executable.
2433 3. .rel.iplt section in static executable. */
2434 if (bfd_link_pic (info))
2435 sreloc = htab->elf.irelifunc;
2436 else if (htab->elf.splt != NULL)
2437 sreloc = htab->elf.srelgot;
2438 else
2439 sreloc = htab->elf.irelplt;
2440 elf_append_rel (output_bfd, sreloc, &outrel);
2441
2442 /* If this reloc is against an external symbol, we
2443 do not want to fiddle with the addend. Otherwise,
2444 we need to include the symbol value so that it
2445 becomes an addend for the dynamic reloc. For an
2446 internal symbol, we have updated addend. */
2447 continue;
2448 }
2449 /* FALLTHROUGH */
2450 case R_386_PC32:
2451 case R_386_PLT32:
2452 goto do_relocation;
2453
2454 case R_386_GOTOFF:
2455 relocation -= (gotplt->output_section->vma
2456 + gotplt->output_offset);
2457 goto do_relocation;
2458 }
2459 }
2460
2461 skip_ifunc:
2462 resolved_to_zero = (eh != NULL
2463 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2464
2465 switch (r_type)
2466 {
2467 case R_386_GOT32X:
2468 case R_386_GOT32:
2469 /* Relocation is to the entry for this symbol in the global
2470 offset table. */
2471 if (htab->elf.sgot == NULL)
2472 abort ();
2473
2474 relative_reloc = FALSE;
2475 if (h != NULL)
2476 {
2477 off = h->got.offset;
2478 if (RESOLVED_LOCALLY_P (info, h, htab))
2479 {
2480 /* We must initialize this entry in the global offset
2481 table. Since the offset must always be a multiple
2482 of 4, we use the least significant bit to record
2483 whether we have initialized it already.
2484
2485 When doing a dynamic link, we create a .rel.got
2486 relocation entry to initialize the value. This
2487 is done in the finish_dynamic_symbol routine. */
2488 if ((off & 1) != 0)
2489 off &= ~1;
2490 else
2491 {
2492 bfd_put_32 (output_bfd, relocation,
2493 htab->elf.sgot->contents + off);
2494 h->got.offset |= 1;
2495
2496 if (GENERATE_RELATIVE_RELOC_P (info, h))
2497 {
2498 /* PR ld/21402: If this symbol isn't dynamic
2499 in PIC, generate R_386_RELATIVE here. */
2500 eh->no_finish_dynamic_symbol = 1;
2501 relative_reloc = TRUE;
2502 }
2503 }
2504 }
2505 else
2506 unresolved_reloc = FALSE;
2507 }
2508 else
2509 {
2510 if (local_got_offsets == NULL)
2511 abort ();
2512
2513 off = local_got_offsets[r_symndx];
2514
2515 /* The offset must always be a multiple of 4. We use
2516 the least significant bit to record whether we have
2517 already generated the necessary reloc. */
2518 if ((off & 1) != 0)
2519 off &= ~1;
2520 else
2521 {
2522 bfd_put_32 (output_bfd, relocation,
2523 htab->elf.sgot->contents + off);
2524 local_got_offsets[r_symndx] |= 1;
2525
2526 if (bfd_link_pic (info))
2527 relative_reloc = TRUE;
2528 }
2529 }
2530
2531 if (relative_reloc)
2532 {
2533 asection *s;
2534 Elf_Internal_Rela outrel;
2535
2536 s = htab->elf.srelgot;
2537 if (s == NULL)
2538 abort ();
2539
2540 outrel.r_offset = (htab->elf.sgot->output_section->vma
2541 + htab->elf.sgot->output_offset
2542 + off);
2543 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2544 elf_append_rel (output_bfd, s, &outrel);
2545 }
2546
2547 if (off >= (bfd_vma) -2)
2548 abort ();
2549
2550 relocation = (htab->elf.sgot->output_section->vma
2551 + htab->elf.sgot->output_offset + off);
2552 if (rel->r_offset > 1
2553 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2554 && *(contents + rel->r_offset - 2) != 0x8d)
2555 {
2556 if (bfd_link_pic (info))
2557 {
2558 /* For PIC, disallow R_386_GOT32 without a base
2559 register, except for "lea foo@GOT, %reg", since
2560 we don't know what the GOT base is. */
2561 const char *name;
2562
2563 disallow_got32:
2564 if (h == NULL || h->root.root.string == NULL)
2565 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2566 NULL);
2567 else
2568 name = h->root.root.string;
2569
2570 _bfd_error_handler
2571 /* xgettext:c-format */
2572 (_("%pB: direct GOT relocation %s against `%s'"
2573 " without base register can not be used"
2574 " when making a shared object"),
2575 input_bfd, howto->name, name);
2576 bfd_set_error (bfd_error_bad_value);
2577 return FALSE;
2578 }
2579 }
2580 else
2581 {
2582 /* Subtract the .got.plt section address only with a base
2583 register. */
2584 relocation -= (htab->elf.sgotplt->output_section->vma
2585 + htab->elf.sgotplt->output_offset);
2586 }
2587
2588 break;
2589
2590 case R_386_GOTOFF:
2591 /* Relocation is relative to the start of the global offset
2592 table. */
2593
2594 /* Check to make sure it isn't a protected function or data
2595 symbol for shared library since it may not be local when
2596 used as function address or with copy relocation. We also
2597 need to make sure that a symbol is referenced locally. */
2598 if (!bfd_link_executable (info) && h)
2599 {
2600 if (!h->def_regular)
2601 {
2602 const char *v;
2603
2604 switch (ELF_ST_VISIBILITY (h->other))
2605 {
2606 case STV_HIDDEN:
2607 v = _("hidden symbol");
2608 break;
2609 case STV_INTERNAL:
2610 v = _("internal symbol");
2611 break;
2612 case STV_PROTECTED:
2613 v = _("protected symbol");
2614 break;
2615 default:
2616 v = _("symbol");
2617 break;
2618 }
2619
2620 _bfd_error_handler
2621 /* xgettext:c-format */
2622 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2623 " `%s' can not be used when making a shared object"),
2624 input_bfd, v, h->root.root.string);
2625 bfd_set_error (bfd_error_bad_value);
2626 return FALSE;
2627 }
2628 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2629 && (h->type == STT_FUNC
2630 || h->type == STT_OBJECT)
2631 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2632 {
2633 _bfd_error_handler
2634 /* xgettext:c-format */
2635 (_("%pB: relocation R_386_GOTOFF against protected %s"
2636 " `%s' can not be used when making a shared object"),
2637 input_bfd,
2638 h->type == STT_FUNC ? "function" : "data",
2639 h->root.root.string);
2640 bfd_set_error (bfd_error_bad_value);
2641 return FALSE;
2642 }
2643 }
2644
2645 /* Note that sgot is not involved in this
2646 calculation. We always want the start of .got.plt. If we
2647 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2648 permitted by the ABI, we might have to change this
2649 calculation. */
2650 relocation -= htab->elf.sgotplt->output_section->vma
2651 + htab->elf.sgotplt->output_offset;
2652 break;
2653
2654 case R_386_GOTPC:
2655 /* Use global offset table as symbol value. */
2656 relocation = htab->elf.sgotplt->output_section->vma
2657 + htab->elf.sgotplt->output_offset;
2658 unresolved_reloc = FALSE;
2659 break;
2660
2661 case R_386_PLT32:
2662 /* Relocation is to the entry for this symbol in the
2663 procedure linkage table. */
2664
2665 /* Resolve a PLT32 reloc against a local symbol directly,
2666 without using the procedure linkage table. */
2667 if (h == NULL)
2668 break;
2669
2670 if ((h->plt.offset == (bfd_vma) -1
2671 && eh->plt_got.offset == (bfd_vma) -1)
2672 || htab->elf.splt == NULL)
2673 {
2674 /* We didn't make a PLT entry for this symbol. This
2675 happens when statically linking PIC code, or when
2676 using -Bsymbolic. */
2677 break;
2678 }
2679
2680 if (h->plt.offset != (bfd_vma) -1)
2681 {
2682 if (htab->plt_second != NULL)
2683 {
2684 resolved_plt = htab->plt_second;
2685 plt_offset = eh->plt_second.offset;
2686 }
2687 else
2688 {
2689 resolved_plt = htab->elf.splt;
2690 plt_offset = h->plt.offset;
2691 }
2692 }
2693 else
2694 {
2695 resolved_plt = htab->plt_got;
2696 plt_offset = eh->plt_got.offset;
2697 }
2698
2699 relocation = (resolved_plt->output_section->vma
2700 + resolved_plt->output_offset
2701 + plt_offset);
2702 unresolved_reloc = FALSE;
2703 break;
2704
2705 case R_386_SIZE32:
2706 /* Set to symbol size. */
2707 relocation = st_size;
2708 /* Fall through. */
2709
2710 case R_386_32:
2711 case R_386_PC32:
2712 if ((input_section->flags & SEC_ALLOC) == 0
2713 || is_vxworks_tls)
2714 break;
2715
2716 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2717 FALSE, resolved_to_zero,
2718 (r_type == R_386_PC32)))
2719 {
2720 Elf_Internal_Rela outrel;
2721 bfd_boolean skip, relocate;
2722 asection *sreloc;
2723
2724 /* When generating a shared object, these relocations
2725 are copied into the output file to be resolved at run
2726 time. */
2727
2728 skip = FALSE;
2729 relocate = FALSE;
2730
2731 outrel.r_offset =
2732 _bfd_elf_section_offset (output_bfd, info, input_section,
2733 rel->r_offset);
2734 if (outrel.r_offset == (bfd_vma) -1)
2735 skip = TRUE;
2736 else if (outrel.r_offset == (bfd_vma) -2)
2737 skip = TRUE, relocate = TRUE;
2738 outrel.r_offset += (input_section->output_section->vma
2739 + input_section->output_offset);
2740
2741 if (skip)
2742 memset (&outrel, 0, sizeof outrel);
2743 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2744 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2745 else
2746 {
2747 /* This symbol is local, or marked to become local. */
2748 relocate = TRUE;
2749 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2750 }
2751
2752 sreloc = elf_section_data (input_section)->sreloc;
2753
2754 if (sreloc == NULL || sreloc->contents == NULL)
2755 {
2756 r = bfd_reloc_notsupported;
2757 goto check_relocation_error;
2758 }
2759
2760 elf_append_rel (output_bfd, sreloc, &outrel);
2761
2762 /* If this reloc is against an external symbol, we do
2763 not want to fiddle with the addend. Otherwise, we
2764 need to include the symbol value so that it becomes
2765 an addend for the dynamic reloc. */
2766 if (! relocate)
2767 continue;
2768 }
2769 break;
2770
2771 case R_386_TLS_IE:
2772 if (!bfd_link_executable (info))
2773 {
2774 Elf_Internal_Rela outrel;
2775 asection *sreloc;
2776
2777 outrel.r_offset = rel->r_offset
2778 + input_section->output_section->vma
2779 + input_section->output_offset;
2780 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2781 sreloc = elf_section_data (input_section)->sreloc;
2782 if (sreloc == NULL)
2783 abort ();
2784 elf_append_rel (output_bfd, sreloc, &outrel);
2785 }
2786 /* Fall through */
2787
2788 case R_386_TLS_GD:
2789 case R_386_TLS_GOTDESC:
2790 case R_386_TLS_DESC_CALL:
2791 case R_386_TLS_IE_32:
2792 case R_386_TLS_GOTIE:
2793 tls_type = GOT_UNKNOWN;
2794 if (h == NULL && local_got_offsets)
2795 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2796 else if (h != NULL)
2797 tls_type = elf_x86_hash_entry(h)->tls_type;
2798 if (tls_type == GOT_TLS_IE)
2799 tls_type = GOT_TLS_IE_NEG;
2800
2801 r_type_tls = r_type;
2802 if (! elf_i386_tls_transition (info, input_bfd,
2803 input_section, contents,
2804 symtab_hdr, sym_hashes,
2805 &r_type_tls, tls_type, rel,
2806 relend, h, r_symndx, TRUE))
2807 return FALSE;
2808
2809 if (r_type_tls == R_386_TLS_LE_32)
2810 {
2811 BFD_ASSERT (! unresolved_reloc);
2812 if (r_type == R_386_TLS_GD)
2813 {
2814 unsigned int type;
2815 bfd_vma roff;
2816
2817 /* GD->LE transition. */
2818 type = *(contents + rel->r_offset - 2);
2819 if (type == 0x04)
2820 {
2821 /* Change
2822 leal foo@tlsgd(,%ebx,1), %eax
2823 call ___tls_get_addr@PLT
2824 into:
2825 movl %gs:0, %eax
2826 subl $foo@tpoff, %eax
2827 (6 byte form of subl). */
2828 roff = rel->r_offset + 5;
2829 }
2830 else
2831 {
2832 /* Change
2833 leal foo@tlsgd(%ebx), %eax
2834 call ___tls_get_addr@PLT
2835 nop
2836 or
2837 leal foo@tlsgd(%reg), %eax
2838 call *___tls_get_addr@GOT(%reg)
2839 which may be converted to
2840 addr32 call ___tls_get_addr
2841 into:
2842 movl %gs:0, %eax; subl $foo@tpoff, %eax
2843 (6 byte form of subl). */
2844 roff = rel->r_offset + 6;
2845 }
2846 memcpy (contents + roff - 8,
2847 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2848 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2849 contents + roff);
2850 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2851 rel++;
2852 wrel++;
2853 continue;
2854 }
2855 else if (r_type == R_386_TLS_GOTDESC)
2856 {
2857 /* GDesc -> LE transition.
2858 It's originally something like:
2859 leal x@tlsdesc(%ebx), %eax
2860
2861 leal x@ntpoff, %eax
2862
2863 Registers other than %eax may be set up here. */
2864
2865 unsigned int val;
2866 bfd_vma roff;
2867
2868 roff = rel->r_offset;
2869 val = bfd_get_8 (input_bfd, contents + roff - 1);
2870
2871 /* Now modify the instruction as appropriate. */
2872 /* aoliva FIXME: remove the above and xor the byte
2873 below with 0x86. */
2874 bfd_put_8 (output_bfd, val ^ 0x86,
2875 contents + roff - 1);
2876 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2877 contents + roff);
2878 continue;
2879 }
2880 else if (r_type == R_386_TLS_DESC_CALL)
2881 {
2882 /* GDesc -> LE transition.
2883 It's originally:
2884 call *(%eax)
2885 Turn it into:
2886 xchg %ax,%ax */
2887
2888 bfd_vma roff;
2889
2890 roff = rel->r_offset;
2891 bfd_put_8 (output_bfd, 0x66, contents + roff);
2892 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2893 continue;
2894 }
2895 else if (r_type == R_386_TLS_IE)
2896 {
2897 unsigned int val;
2898
2899 /* IE->LE transition:
2900 Originally it can be one of:
2901 movl foo, %eax
2902 movl foo, %reg
2903 addl foo, %reg
2904 We change it into:
2905 movl $foo, %eax
2906 movl $foo, %reg
2907 addl $foo, %reg. */
2908 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2909 if (val == 0xa1)
2910 {
2911 /* movl foo, %eax. */
2912 bfd_put_8 (output_bfd, 0xb8,
2913 contents + rel->r_offset - 1);
2914 }
2915 else
2916 {
2917 unsigned int type;
2918
2919 type = bfd_get_8 (input_bfd,
2920 contents + rel->r_offset - 2);
2921 switch (type)
2922 {
2923 case 0x8b:
2924 /* movl */
2925 bfd_put_8 (output_bfd, 0xc7,
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 case 0x03:
2932 /* addl */
2933 bfd_put_8 (output_bfd, 0x81,
2934 contents + rel->r_offset - 2);
2935 bfd_put_8 (output_bfd,
2936 0xc0 | ((val >> 3) & 7),
2937 contents + rel->r_offset - 1);
2938 break;
2939 default:
2940 BFD_FAIL ();
2941 break;
2942 }
2943 }
2944 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2945 contents + rel->r_offset);
2946 continue;
2947 }
2948 else
2949 {
2950 unsigned int val, type;
2951
2952 /* {IE_32,GOTIE}->LE transition:
2953 Originally it can be one of:
2954 subl foo(%reg1), %reg2
2955 movl foo(%reg1), %reg2
2956 addl foo(%reg1), %reg2
2957 We change it into:
2958 subl $foo, %reg2
2959 movl $foo, %reg2 (6 byte form)
2960 addl $foo, %reg2. */
2961 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2962 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2963 if (type == 0x8b)
2964 {
2965 /* movl */
2966 bfd_put_8 (output_bfd, 0xc7,
2967 contents + rel->r_offset - 2);
2968 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2969 contents + rel->r_offset - 1);
2970 }
2971 else if (type == 0x2b)
2972 {
2973 /* subl */
2974 bfd_put_8 (output_bfd, 0x81,
2975 contents + rel->r_offset - 2);
2976 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2977 contents + rel->r_offset - 1);
2978 }
2979 else if (type == 0x03)
2980 {
2981 /* addl */
2982 bfd_put_8 (output_bfd, 0x81,
2983 contents + rel->r_offset - 2);
2984 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2985 contents + rel->r_offset - 1);
2986 }
2987 else
2988 BFD_FAIL ();
2989 if (r_type == R_386_TLS_GOTIE)
2990 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2991 contents + rel->r_offset);
2992 else
2993 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2994 contents + rel->r_offset);
2995 continue;
2996 }
2997 }
2998
2999 if (htab->elf.sgot == NULL)
3000 abort ();
3001
3002 if (h != NULL)
3003 {
3004 off = h->got.offset;
3005 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3006 }
3007 else
3008 {
3009 if (local_got_offsets == NULL)
3010 abort ();
3011
3012 off = local_got_offsets[r_symndx];
3013 offplt = local_tlsdesc_gotents[r_symndx];
3014 }
3015
3016 if ((off & 1) != 0)
3017 off &= ~1;
3018 else
3019 {
3020 Elf_Internal_Rela outrel;
3021 int dr_type;
3022 asection *sreloc;
3023
3024 if (htab->elf.srelgot == NULL)
3025 abort ();
3026
3027 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3028
3029 if (GOT_TLS_GDESC_P (tls_type))
3030 {
3031 bfd_byte *loc;
3032 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3033 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3034 <= htab->elf.sgotplt->size);
3035 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3036 + htab->elf.sgotplt->output_offset
3037 + offplt
3038 + htab->sgotplt_jump_table_size);
3039 sreloc = htab->elf.srelplt;
3040 loc = sreloc->contents;
3041 loc += (htab->next_tls_desc_index++
3042 * sizeof (Elf32_External_Rel));
3043 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3044 <= sreloc->contents + sreloc->size);
3045 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3046 if (indx == 0)
3047 {
3048 BFD_ASSERT (! unresolved_reloc);
3049 bfd_put_32 (output_bfd,
3050 relocation - _bfd_x86_elf_dtpoff_base (info),
3051 htab->elf.sgotplt->contents + offplt
3052 + htab->sgotplt_jump_table_size + 4);
3053 }
3054 else
3055 {
3056 bfd_put_32 (output_bfd, 0,
3057 htab->elf.sgotplt->contents + offplt
3058 + htab->sgotplt_jump_table_size + 4);
3059 }
3060 }
3061
3062 sreloc = htab->elf.srelgot;
3063
3064 outrel.r_offset = (htab->elf.sgot->output_section->vma
3065 + htab->elf.sgot->output_offset + off);
3066
3067 if (GOT_TLS_GD_P (tls_type))
3068 dr_type = R_386_TLS_DTPMOD32;
3069 else if (GOT_TLS_GDESC_P (tls_type))
3070 goto dr_done;
3071 else if (tls_type == GOT_TLS_IE_POS)
3072 dr_type = R_386_TLS_TPOFF;
3073 else
3074 dr_type = R_386_TLS_TPOFF32;
3075
3076 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3077 bfd_put_32 (output_bfd,
3078 relocation - _bfd_x86_elf_dtpoff_base (info),
3079 htab->elf.sgot->contents + off);
3080 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3081 bfd_put_32 (output_bfd,
3082 _bfd_x86_elf_dtpoff_base (info) - relocation,
3083 htab->elf.sgot->contents + off);
3084 else if (dr_type != R_386_TLS_DESC)
3085 bfd_put_32 (output_bfd, 0,
3086 htab->elf.sgot->contents + off);
3087 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3088
3089 elf_append_rel (output_bfd, sreloc, &outrel);
3090
3091 if (GOT_TLS_GD_P (tls_type))
3092 {
3093 if (indx == 0)
3094 {
3095 BFD_ASSERT (! unresolved_reloc);
3096 bfd_put_32 (output_bfd,
3097 relocation - _bfd_x86_elf_dtpoff_base (info),
3098 htab->elf.sgot->contents + off + 4);
3099 }
3100 else
3101 {
3102 bfd_put_32 (output_bfd, 0,
3103 htab->elf.sgot->contents + off + 4);
3104 outrel.r_info = ELF32_R_INFO (indx,
3105 R_386_TLS_DTPOFF32);
3106 outrel.r_offset += 4;
3107 elf_append_rel (output_bfd, sreloc, &outrel);
3108 }
3109 }
3110 else if (tls_type == GOT_TLS_IE_BOTH)
3111 {
3112 bfd_put_32 (output_bfd,
3113 (indx == 0
3114 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3115 : 0),
3116 htab->elf.sgot->contents + off + 4);
3117 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3118 outrel.r_offset += 4;
3119 elf_append_rel (output_bfd, sreloc, &outrel);
3120 }
3121
3122 dr_done:
3123 if (h != NULL)
3124 h->got.offset |= 1;
3125 else
3126 local_got_offsets[r_symndx] |= 1;
3127 }
3128
3129 if (off >= (bfd_vma) -2
3130 && ! GOT_TLS_GDESC_P (tls_type))
3131 abort ();
3132 if (r_type_tls == R_386_TLS_GOTDESC
3133 || r_type_tls == R_386_TLS_DESC_CALL)
3134 {
3135 relocation = htab->sgotplt_jump_table_size + offplt;
3136 unresolved_reloc = FALSE;
3137 }
3138 else if (r_type_tls == r_type)
3139 {
3140 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3141 + htab->elf.sgotplt->output_offset;
3142 relocation = htab->elf.sgot->output_section->vma
3143 + htab->elf.sgot->output_offset + off - g_o_t;
3144 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3145 && tls_type == GOT_TLS_IE_BOTH)
3146 relocation += 4;
3147 if (r_type == R_386_TLS_IE)
3148 relocation += g_o_t;
3149 unresolved_reloc = FALSE;
3150 }
3151 else if (r_type == R_386_TLS_GD)
3152 {
3153 unsigned int val, type;
3154 bfd_vma roff;
3155
3156 /* GD->IE transition. */
3157 type = *(contents + rel->r_offset - 2);
3158 val = *(contents + rel->r_offset - 1);
3159 if (type == 0x04)
3160 {
3161 /* Change
3162 leal foo@tlsgd(,%ebx,1), %eax
3163 call ___tls_get_addr@PLT
3164 into:
3165 movl %gs:0, %eax
3166 subl $foo@gottpoff(%ebx), %eax. */
3167 val >>= 3;
3168 roff = rel->r_offset - 3;
3169 }
3170 else
3171 {
3172 /* Change
3173 leal foo@tlsgd(%ebx), %eax
3174 call ___tls_get_addr@PLT
3175 nop
3176 or
3177 leal foo@tlsgd(%reg), %eax
3178 call *___tls_get_addr@GOT(%reg)
3179 which may be converted to
3180 addr32 call ___tls_get_addr
3181 into:
3182 movl %gs:0, %eax;
3183 subl $foo@gottpoff(%reg), %eax. */
3184 roff = rel->r_offset - 2;
3185 }
3186 memcpy (contents + roff,
3187 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3188 contents[roff + 7] = 0x80 | (val & 7);
3189 /* If foo is used only with foo@gotntpoff(%reg) and
3190 foo@indntpoff, but not with foo@gottpoff(%reg), change
3191 subl $foo@gottpoff(%reg), %eax
3192 into:
3193 addl $foo@gotntpoff(%reg), %eax. */
3194 if (tls_type == GOT_TLS_IE_POS)
3195 contents[roff + 6] = 0x03;
3196 bfd_put_32 (output_bfd,
3197 htab->elf.sgot->output_section->vma
3198 + htab->elf.sgot->output_offset + off
3199 - htab->elf.sgotplt->output_section->vma
3200 - htab->elf.sgotplt->output_offset,
3201 contents + roff + 8);
3202 /* Skip R_386_PLT32 and R_386_GOT32X. */
3203 rel++;
3204 wrel++;
3205 continue;
3206 }
3207 else if (r_type == R_386_TLS_GOTDESC)
3208 {
3209 /* GDesc -> IE transition.
3210 It's originally something like:
3211 leal x@tlsdesc(%ebx), %eax
3212
3213 Change it to:
3214 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3215 or:
3216 movl x@gottpoff(%ebx), %eax # before negl %eax
3217
3218 Registers other than %eax may be set up here. */
3219
3220 bfd_vma roff;
3221
3222 /* First, make sure it's a leal adding ebx to a 32-bit
3223 offset into any register, although it's probably
3224 almost always going to be eax. */
3225 roff = rel->r_offset;
3226
3227 /* Now modify the instruction as appropriate. */
3228 /* To turn a leal into a movl in the form we use it, it
3229 suffices to change the first byte from 0x8d to 0x8b.
3230 aoliva FIXME: should we decide to keep the leal, all
3231 we have to do is remove the statement below, and
3232 adjust the relaxation of R_386_TLS_DESC_CALL. */
3233 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3234
3235 if (tls_type == GOT_TLS_IE_BOTH)
3236 off += 4;
3237
3238 bfd_put_32 (output_bfd,
3239 htab->elf.sgot->output_section->vma
3240 + htab->elf.sgot->output_offset + off
3241 - htab->elf.sgotplt->output_section->vma
3242 - htab->elf.sgotplt->output_offset,
3243 contents + roff);
3244 continue;
3245 }
3246 else if (r_type == R_386_TLS_DESC_CALL)
3247 {
3248 /* GDesc -> IE transition.
3249 It's originally:
3250 call *(%eax)
3251
3252 Change it to:
3253 xchg %ax,%ax
3254 or
3255 negl %eax
3256 depending on how we transformed the TLS_GOTDESC above.
3257 */
3258
3259 bfd_vma roff;
3260
3261 roff = rel->r_offset;
3262
3263 /* Now modify the instruction as appropriate. */
3264 if (tls_type != GOT_TLS_IE_NEG)
3265 {
3266 /* xchg %ax,%ax */
3267 bfd_put_8 (output_bfd, 0x66, contents + roff);
3268 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3269 }
3270 else
3271 {
3272 /* negl %eax */
3273 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3274 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3275 }
3276
3277 continue;
3278 }
3279 else
3280 BFD_ASSERT (FALSE);
3281 break;
3282
3283 case R_386_TLS_LDM:
3284 if (! elf_i386_tls_transition (info, input_bfd,
3285 input_section, contents,
3286 symtab_hdr, sym_hashes,
3287 &r_type, GOT_UNKNOWN, rel,
3288 relend, h, r_symndx, TRUE))
3289 return FALSE;
3290
3291 if (r_type != R_386_TLS_LDM)
3292 {
3293 /* LD->LE transition. Change
3294 leal foo@tlsldm(%ebx) %eax
3295 call ___tls_get_addr@PLT
3296 into:
3297 movl %gs:0, %eax
3298 nop
3299 leal 0(%esi,1), %esi
3300 or change
3301 leal foo@tlsldm(%reg) %eax
3302 call *___tls_get_addr@GOT(%reg)
3303 which may be converted to
3304 addr32 call ___tls_get_addr
3305 into:
3306 movl %gs:0, %eax
3307 leal 0(%esi), %esi */
3308 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3309 if (*(contents + rel->r_offset + 4) == 0xff
3310 || *(contents + rel->r_offset + 4) == 0x67)
3311 memcpy (contents + rel->r_offset - 2,
3312 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3313 else
3314 memcpy (contents + rel->r_offset - 2,
3315 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3316 /* Skip R_386_PC32/R_386_PLT32. */
3317 rel++;
3318 wrel++;
3319 continue;
3320 }
3321
3322 if (htab->elf.sgot == NULL)
3323 abort ();
3324
3325 off = htab->tls_ld_or_ldm_got.offset;
3326 if (off & 1)
3327 off &= ~1;
3328 else
3329 {
3330 Elf_Internal_Rela outrel;
3331
3332 if (htab->elf.srelgot == NULL)
3333 abort ();
3334
3335 outrel.r_offset = (htab->elf.sgot->output_section->vma
3336 + htab->elf.sgot->output_offset + off);
3337
3338 bfd_put_32 (output_bfd, 0,
3339 htab->elf.sgot->contents + off);
3340 bfd_put_32 (output_bfd, 0,
3341 htab->elf.sgot->contents + off + 4);
3342 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3343 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3344 htab->tls_ld_or_ldm_got.offset |= 1;
3345 }
3346 relocation = htab->elf.sgot->output_section->vma
3347 + htab->elf.sgot->output_offset + off
3348 - htab->elf.sgotplt->output_section->vma
3349 - htab->elf.sgotplt->output_offset;
3350 unresolved_reloc = FALSE;
3351 break;
3352
3353 case R_386_TLS_LDO_32:
3354 if (!bfd_link_executable (info)
3355 || (input_section->flags & SEC_CODE) == 0)
3356 relocation -= _bfd_x86_elf_dtpoff_base (info);
3357 else
3358 /* When converting LDO to LE, we must negate. */
3359 relocation = -elf_i386_tpoff (info, relocation);
3360 break;
3361
3362 case R_386_TLS_LE_32:
3363 case R_386_TLS_LE:
3364 if (!bfd_link_executable (info))
3365 {
3366 Elf_Internal_Rela outrel;
3367 asection *sreloc;
3368
3369 outrel.r_offset = rel->r_offset
3370 + input_section->output_section->vma
3371 + input_section->output_offset;
3372 if (h != NULL && h->dynindx != -1)
3373 indx = h->dynindx;
3374 else
3375 indx = 0;
3376 if (r_type == R_386_TLS_LE_32)
3377 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3378 else
3379 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3380 sreloc = elf_section_data (input_section)->sreloc;
3381 if (sreloc == NULL)
3382 abort ();
3383 elf_append_rel (output_bfd, sreloc, &outrel);
3384 if (indx)
3385 continue;
3386 else if (r_type == R_386_TLS_LE_32)
3387 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3388 else
3389 relocation -= _bfd_x86_elf_dtpoff_base (info);
3390 }
3391 else if (r_type == R_386_TLS_LE_32)
3392 relocation = elf_i386_tpoff (info, relocation);
3393 else
3394 relocation = -elf_i386_tpoff (info, relocation);
3395 break;
3396
3397 default:
3398 break;
3399 }
3400
3401 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3402 because such sections are not SEC_ALLOC and thus ld.so will
3403 not process them. */
3404 if (unresolved_reloc
3405 && !((input_section->flags & SEC_DEBUGGING) != 0
3406 && h->def_dynamic)
3407 && _bfd_elf_section_offset (output_bfd, info, input_section,
3408 rel->r_offset) != (bfd_vma) -1)
3409 {
3410 _bfd_error_handler
3411 /* xgettext:c-format */
3412 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3413 input_bfd,
3414 input_section,
3415 (uint64_t) rel->r_offset,
3416 howto->name,
3417 h->root.root.string);
3418 return FALSE;
3419 }
3420
3421 do_relocation:
3422 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3423 contents, rel->r_offset,
3424 relocation, 0);
3425
3426 check_relocation_error:
3427 if (r != bfd_reloc_ok)
3428 {
3429 const char *name;
3430
3431 if (h != NULL)
3432 name = h->root.root.string;
3433 else
3434 {
3435 name = bfd_elf_string_from_elf_section (input_bfd,
3436 symtab_hdr->sh_link,
3437 sym->st_name);
3438 if (name == NULL)
3439 return FALSE;
3440 if (*name == '\0')
3441 name = bfd_section_name (sec);
3442 }
3443
3444 if (r == bfd_reloc_overflow)
3445 (*info->callbacks->reloc_overflow)
3446 (info, (h ? &h->root : NULL), name, howto->name,
3447 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3448 else
3449 {
3450 _bfd_error_handler
3451 /* xgettext:c-format */
3452 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3453 input_bfd, input_section,
3454 (uint64_t) rel->r_offset, name, (int) r);
3455 return FALSE;
3456 }
3457 }
3458
3459 if (wrel != rel)
3460 *wrel = *rel;
3461 }
3462
3463 if (wrel != rel)
3464 {
3465 Elf_Internal_Shdr *rel_hdr;
3466 size_t deleted = rel - wrel;
3467
3468 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3469 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3470 if (rel_hdr->sh_size == 0)
3471 {
3472 /* It is too late to remove an empty reloc section. Leave
3473 one NONE reloc.
3474 ??? What is wrong with an empty section??? */
3475 rel_hdr->sh_size = rel_hdr->sh_entsize;
3476 deleted -= 1;
3477 }
3478 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3479 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3480 input_section->reloc_count -= deleted;
3481 }
3482
3483 return TRUE;
3484 }
3485
3486 /* Finish up dynamic symbol handling. We set the contents of various
3487 dynamic sections here. */
3488
3489 static bfd_boolean
3490 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3491 struct bfd_link_info *info,
3492 struct elf_link_hash_entry *h,
3493 Elf_Internal_Sym *sym)
3494 {
3495 struct elf_x86_link_hash_table *htab;
3496 unsigned plt_entry_size;
3497 struct elf_x86_link_hash_entry *eh;
3498 bfd_boolean local_undefweak;
3499 bfd_boolean use_plt_second;
3500
3501 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3502 if (htab == NULL)
3503 return FALSE;
3504
3505 plt_entry_size = htab->plt.plt_entry_size;
3506
3507 /* Use the second PLT section only if there is .plt section. */
3508 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3509
3510 eh = (struct elf_x86_link_hash_entry *) h;
3511 if (eh->no_finish_dynamic_symbol)
3512 abort ();
3513
3514 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3515 resolved undefined weak symbols in executable so that their
3516 references have value 0 at run-time. */
3517 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3518
3519 if (h->plt.offset != (bfd_vma) -1)
3520 {
3521 bfd_vma plt_index, plt_offset;
3522 bfd_vma got_offset;
3523 Elf_Internal_Rela rel;
3524 bfd_byte *loc;
3525 asection *plt, *resolved_plt, *gotplt, *relplt;
3526
3527 /* When building a static executable, use .iplt, .igot.plt and
3528 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3529 if (htab->elf.splt != NULL)
3530 {
3531 plt = htab->elf.splt;
3532 gotplt = htab->elf.sgotplt;
3533 relplt = htab->elf.srelplt;
3534 }
3535 else
3536 {
3537 plt = htab->elf.iplt;
3538 gotplt = htab->elf.igotplt;
3539 relplt = htab->elf.irelplt;
3540 }
3541
3542 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3543
3544 /* Get the index in the procedure linkage table which
3545 corresponds to this symbol. This is the index of this symbol
3546 in all the symbols for which we are making plt entries. The
3547 first entry in the procedure linkage table is reserved.
3548
3549 Get the offset into the .got table of the entry that
3550 corresponds to this function. Each .got entry is 4 bytes.
3551 The first three are reserved.
3552
3553 For static executables, we don't reserve anything. */
3554
3555 if (plt == htab->elf.splt)
3556 {
3557 got_offset = (h->plt.offset / plt_entry_size
3558 - htab->plt.has_plt0);
3559 got_offset = (got_offset + 3) * 4;
3560 }
3561 else
3562 {
3563 got_offset = h->plt.offset / plt_entry_size;
3564 got_offset = got_offset * 4;
3565 }
3566
3567 /* Fill in the entry in the procedure linkage table and update
3568 the first slot. */
3569 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3570 plt_entry_size);
3571
3572 if (use_plt_second)
3573 {
3574 const bfd_byte *plt_entry;
3575 if (bfd_link_pic (info))
3576 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3577 else
3578 plt_entry = htab->non_lazy_plt->plt_entry;
3579 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3580 plt_entry, htab->non_lazy_plt->plt_entry_size);
3581
3582 resolved_plt = htab->plt_second;
3583 plt_offset = eh->plt_second.offset;
3584 }
3585 else
3586 {
3587 resolved_plt = plt;
3588 plt_offset = h->plt.offset;
3589 }
3590
3591 if (! bfd_link_pic (info))
3592 {
3593 bfd_put_32 (output_bfd,
3594 (gotplt->output_section->vma
3595 + gotplt->output_offset
3596 + got_offset),
3597 resolved_plt->contents + plt_offset
3598 + htab->plt.plt_got_offset);
3599
3600 if (htab->target_os == is_vxworks)
3601 {
3602 int s, k, reloc_index;
3603
3604 /* Create the R_386_32 relocation referencing the GOT
3605 for this PLT entry. */
3606
3607 /* S: Current slot number (zero-based). */
3608 s = ((h->plt.offset - htab->plt.plt_entry_size)
3609 / htab->plt.plt_entry_size);
3610 /* K: Number of relocations for PLTResolve. */
3611 if (bfd_link_pic (info))
3612 k = PLTRESOLVE_RELOCS_SHLIB;
3613 else
3614 k = PLTRESOLVE_RELOCS;
3615 /* Skip the PLTresolve relocations, and the relocations for
3616 the other PLT slots. */
3617 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3618 loc = (htab->srelplt2->contents + reloc_index
3619 * sizeof (Elf32_External_Rel));
3620
3621 rel.r_offset = (plt->output_section->vma
3622 + plt->output_offset
3623 + h->plt.offset + 2),
3624 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3625 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3626
3627 /* Create the R_386_32 relocation referencing the beginning of
3628 the PLT for this GOT entry. */
3629 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3630 + htab->elf.sgotplt->output_offset
3631 + got_offset);
3632 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3633 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3634 loc + sizeof (Elf32_External_Rel));
3635 }
3636 }
3637 else
3638 {
3639 bfd_put_32 (output_bfd, got_offset,
3640 resolved_plt->contents + plt_offset
3641 + htab->plt.plt_got_offset);
3642 }
3643
3644 /* Fill in the entry in the global offset table. Leave the entry
3645 as zero for undefined weak symbol in PIE. No PLT relocation
3646 against undefined weak symbol in PIE. */
3647 if (!local_undefweak)
3648 {
3649 if (htab->plt.has_plt0)
3650 bfd_put_32 (output_bfd,
3651 (plt->output_section->vma
3652 + plt->output_offset
3653 + h->plt.offset
3654 + htab->lazy_plt->plt_lazy_offset),
3655 gotplt->contents + got_offset);
3656
3657 /* Fill in the entry in the .rel.plt section. */
3658 rel.r_offset = (gotplt->output_section->vma
3659 + gotplt->output_offset
3660 + got_offset);
3661 if (PLT_LOCAL_IFUNC_P (info, h))
3662 {
3663 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3664 h->root.root.string,
3665 h->root.u.def.section->owner);
3666
3667 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3668 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3669 in the .got.plt section. */
3670 bfd_put_32 (output_bfd,
3671 (h->root.u.def.value
3672 + h->root.u.def.section->output_section->vma
3673 + h->root.u.def.section->output_offset),
3674 gotplt->contents + got_offset);
3675 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3676 /* R_386_IRELATIVE comes last. */
3677 plt_index = htab->next_irelative_index--;
3678 }
3679 else
3680 {
3681 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3682 plt_index = htab->next_jump_slot_index++;
3683 }
3684
3685 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3686 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3687
3688 /* Don't fill the second and third slots in PLT entry for
3689 static executables nor without PLT0. */
3690 if (plt == htab->elf.splt && htab->plt.has_plt0)
3691 {
3692 bfd_put_32 (output_bfd,
3693 plt_index * sizeof (Elf32_External_Rel),
3694 plt->contents + h->plt.offset
3695 + htab->lazy_plt->plt_reloc_offset);
3696 bfd_put_32 (output_bfd,
3697 - (h->plt.offset
3698 + htab->lazy_plt->plt_plt_offset + 4),
3699 (plt->contents + h->plt.offset
3700 + htab->lazy_plt->plt_plt_offset));
3701 }
3702 }
3703 }
3704 else if (eh->plt_got.offset != (bfd_vma) -1)
3705 {
3706 bfd_vma got_offset, plt_offset;
3707 asection *plt, *got, *gotplt;
3708 const bfd_byte *got_plt_entry;
3709
3710 /* Set the entry in the GOT procedure linkage table. */
3711 plt = htab->plt_got;
3712 got = htab->elf.sgot;
3713 gotplt = htab->elf.sgotplt;
3714 got_offset = h->got.offset;
3715
3716 if (got_offset == (bfd_vma) -1
3717 || plt == NULL
3718 || got == NULL
3719 || gotplt == NULL)
3720 abort ();
3721
3722 /* Fill in the entry in the GOT procedure linkage table. */
3723 if (! bfd_link_pic (info))
3724 {
3725 got_plt_entry = htab->non_lazy_plt->plt_entry;
3726 got_offset += got->output_section->vma + got->output_offset;
3727 }
3728 else
3729 {
3730 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3731 got_offset += (got->output_section->vma
3732 + got->output_offset
3733 - gotplt->output_section->vma
3734 - gotplt->output_offset);
3735 }
3736
3737 plt_offset = eh->plt_got.offset;
3738 memcpy (plt->contents + plt_offset, got_plt_entry,
3739 htab->non_lazy_plt->plt_entry_size);
3740 bfd_put_32 (output_bfd, got_offset,
3741 (plt->contents + plt_offset
3742 + htab->non_lazy_plt->plt_got_offset));
3743 }
3744
3745 if (!local_undefweak
3746 && !h->def_regular
3747 && (h->plt.offset != (bfd_vma) -1
3748 || eh->plt_got.offset != (bfd_vma) -1))
3749 {
3750 /* Mark the symbol as undefined, rather than as defined in
3751 the .plt section. Leave the value if there were any
3752 relocations where pointer equality matters (this is a clue
3753 for the dynamic linker, to make function pointer
3754 comparisons work between an application and shared
3755 library), otherwise set it to zero. If a function is only
3756 called from a binary, there is no need to slow down
3757 shared libraries because of that. */
3758 sym->st_shndx = SHN_UNDEF;
3759 if (!h->pointer_equality_needed)
3760 sym->st_value = 0;
3761 }
3762
3763 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3764
3765 /* Don't generate dynamic GOT relocation against undefined weak
3766 symbol in executable. */
3767 if (h->got.offset != (bfd_vma) -1
3768 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3769 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3770 && !local_undefweak)
3771 {
3772 Elf_Internal_Rela rel;
3773 asection *relgot = htab->elf.srelgot;
3774
3775 /* This symbol has an entry in the global offset table. Set it
3776 up. */
3777
3778 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3779 abort ();
3780
3781 rel.r_offset = (htab->elf.sgot->output_section->vma
3782 + htab->elf.sgot->output_offset
3783 + (h->got.offset & ~(bfd_vma) 1));
3784
3785 /* If this is a static link, or it is a -Bsymbolic link and the
3786 symbol is defined locally or was forced to be local because
3787 of a version file, we just want to emit a RELATIVE reloc.
3788 The entry in the global offset table will already have been
3789 initialized in the relocate_section function. */
3790 if (h->def_regular
3791 && h->type == STT_GNU_IFUNC)
3792 {
3793 if (h->plt.offset == (bfd_vma) -1)
3794 {
3795 /* STT_GNU_IFUNC is referenced without PLT. */
3796 if (htab->elf.splt == NULL)
3797 {
3798 /* use .rel[a].iplt section to store .got relocations
3799 in static executable. */
3800 relgot = htab->elf.irelplt;
3801 }
3802 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3803 {
3804 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3805 h->root.root.string,
3806 h->root.u.def.section->owner);
3807
3808 bfd_put_32 (output_bfd,
3809 (h->root.u.def.value
3810 + h->root.u.def.section->output_section->vma
3811 + h->root.u.def.section->output_offset),
3812 htab->elf.sgot->contents + h->got.offset);
3813 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3814 }
3815 else
3816 goto do_glob_dat;
3817 }
3818 else if (bfd_link_pic (info))
3819 {
3820 /* Generate R_386_GLOB_DAT. */
3821 goto do_glob_dat;
3822 }
3823 else
3824 {
3825 asection *plt;
3826 bfd_vma plt_offset;
3827
3828 if (!h->pointer_equality_needed)
3829 abort ();
3830
3831 /* For non-shared object, we can't use .got.plt, which
3832 contains the real function addres if we need pointer
3833 equality. We load the GOT entry with the PLT entry. */
3834 if (htab->plt_second != NULL)
3835 {
3836 plt = htab->plt_second;
3837 plt_offset = eh->plt_second.offset;
3838 }
3839 else
3840 {
3841 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3842 plt_offset = h->plt.offset;
3843 }
3844 bfd_put_32 (output_bfd,
3845 (plt->output_section->vma
3846 + plt->output_offset + plt_offset),
3847 htab->elf.sgot->contents + h->got.offset);
3848 return TRUE;
3849 }
3850 }
3851 else if (bfd_link_pic (info)
3852 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3853 {
3854 BFD_ASSERT((h->got.offset & 1) != 0);
3855 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3856 }
3857 else
3858 {
3859 BFD_ASSERT((h->got.offset & 1) == 0);
3860 do_glob_dat:
3861 bfd_put_32 (output_bfd, (bfd_vma) 0,
3862 htab->elf.sgot->contents + h->got.offset);
3863 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3864 }
3865
3866 elf_append_rel (output_bfd, relgot, &rel);
3867 }
3868
3869 if (h->needs_copy)
3870 {
3871 Elf_Internal_Rela rel;
3872 asection *s;
3873
3874 /* This symbol needs a copy reloc. Set it up. */
3875 VERIFY_COPY_RELOC (h, htab)
3876
3877 rel.r_offset = (h->root.u.def.value
3878 + h->root.u.def.section->output_section->vma
3879 + h->root.u.def.section->output_offset);
3880 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3881 if (h->root.u.def.section == htab->elf.sdynrelro)
3882 s = htab->elf.sreldynrelro;
3883 else
3884 s = htab->elf.srelbss;
3885 elf_append_rel (output_bfd, s, &rel);
3886 }
3887
3888 return TRUE;
3889 }
3890
3891 /* Finish up local dynamic symbol handling. We set the contents of
3892 various dynamic sections here. */
3893
3894 static bfd_boolean
3895 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3896 {
3897 struct elf_link_hash_entry *h
3898 = (struct elf_link_hash_entry *) *slot;
3899 struct bfd_link_info *info
3900 = (struct bfd_link_info *) inf;
3901
3902 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3903 h, NULL);
3904 }
3905
3906 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3907 here since undefined weak symbol may not be dynamic and may not be
3908 called for elf_i386_finish_dynamic_symbol. */
3909
3910 static bfd_boolean
3911 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3912 void *inf)
3913 {
3914 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3915 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3916
3917 if (h->root.type != bfd_link_hash_undefweak
3918 || h->dynindx != -1)
3919 return TRUE;
3920
3921 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3922 info, h, NULL);
3923 }
3924
3925 /* Used to decide how to sort relocs in an optimal manner for the
3926 dynamic linker, before writing them out. */
3927
3928 static enum elf_reloc_type_class
3929 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3930 const asection *rel_sec ATTRIBUTE_UNUSED,
3931 const Elf_Internal_Rela *rela)
3932 {
3933 bfd *abfd = info->output_bfd;
3934 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3935 struct elf_link_hash_table *htab = elf_hash_table (info);
3936
3937 if (htab->dynsym != NULL
3938 && htab->dynsym->contents != NULL)
3939 {
3940 /* Check relocation against STT_GNU_IFUNC symbol if there are
3941 dynamic symbols. */
3942 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3943 if (r_symndx != STN_UNDEF)
3944 {
3945 Elf_Internal_Sym sym;
3946 if (!bed->s->swap_symbol_in (abfd,
3947 (htab->dynsym->contents
3948 + r_symndx * sizeof (Elf32_External_Sym)),
3949 0, &sym))
3950 abort ();
3951
3952 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3953 return reloc_class_ifunc;
3954 }
3955 }
3956
3957 switch (ELF32_R_TYPE (rela->r_info))
3958 {
3959 case R_386_IRELATIVE:
3960 return reloc_class_ifunc;
3961 case R_386_RELATIVE:
3962 return reloc_class_relative;
3963 case R_386_JUMP_SLOT:
3964 return reloc_class_plt;
3965 case R_386_COPY:
3966 return reloc_class_copy;
3967 default:
3968 return reloc_class_normal;
3969 }
3970 }
3971
3972 /* Finish up the dynamic sections. */
3973
3974 static bfd_boolean
3975 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3976 struct bfd_link_info *info)
3977 {
3978 struct elf_x86_link_hash_table *htab;
3979
3980 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3981 if (htab == NULL)
3982 return FALSE;
3983
3984 if (!htab->elf.dynamic_sections_created)
3985 return TRUE;
3986
3987 if (htab->elf.splt && htab->elf.splt->size > 0)
3988 {
3989 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3990 really seem like the right value. */
3991 elf_section_data (htab->elf.splt->output_section)
3992 ->this_hdr.sh_entsize = 4;
3993
3994 if (htab->plt.has_plt0)
3995 {
3996 /* Fill in the special first entry in the procedure linkage
3997 table. */
3998 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3999 htab->lazy_plt->plt0_entry_size);
4000 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4001 htab->plt0_pad_byte,
4002 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4003 if (!bfd_link_pic (info))
4004 {
4005 bfd_put_32 (output_bfd,
4006 (htab->elf.sgotplt->output_section->vma
4007 + htab->elf.sgotplt->output_offset
4008 + 4),
4009 htab->elf.splt->contents
4010 + htab->lazy_plt->plt0_got1_offset);
4011 bfd_put_32 (output_bfd,
4012 (htab->elf.sgotplt->output_section->vma
4013 + htab->elf.sgotplt->output_offset
4014 + 8),
4015 htab->elf.splt->contents
4016 + htab->lazy_plt->plt0_got2_offset);
4017
4018 if (htab->target_os == is_vxworks)
4019 {
4020 Elf_Internal_Rela rel;
4021 int num_plts = (htab->elf.splt->size
4022 / htab->plt.plt_entry_size) - 1;
4023 unsigned char *p;
4024 asection *srelplt2 = htab->srelplt2;
4025
4026 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4027 + 4. On IA32 we use REL relocations so the
4028 addend goes in the PLT directly. */
4029 rel.r_offset = (htab->elf.splt->output_section->vma
4030 + htab->elf.splt->output_offset
4031 + htab->lazy_plt->plt0_got1_offset);
4032 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4033 R_386_32);
4034 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4035 srelplt2->contents);
4036 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4037 + 8. */
4038 rel.r_offset = (htab->elf.splt->output_section->vma
4039 + htab->elf.splt->output_offset
4040 + htab->lazy_plt->plt0_got2_offset);
4041 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4042 R_386_32);
4043 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4044 srelplt2->contents +
4045 sizeof (Elf32_External_Rel));
4046 /* Correct the .rel.plt.unloaded relocations. */
4047 p = srelplt2->contents;
4048 if (bfd_link_pic (info))
4049 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4050 else
4051 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4052
4053 for (; num_plts; num_plts--)
4054 {
4055 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4056 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4057 R_386_32);
4058 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4059 p += sizeof (Elf32_External_Rel);
4060
4061 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4062 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4063 R_386_32);
4064 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4065 p += sizeof (Elf32_External_Rel);
4066 }
4067 }
4068 }
4069 }
4070 }
4071
4072 /* Fill PLT entries for undefined weak symbols in PIE. */
4073 if (bfd_link_pie (info))
4074 bfd_hash_traverse (&info->hash->table,
4075 elf_i386_pie_finish_undefweak_symbol,
4076 info);
4077
4078 return TRUE;
4079 }
4080
4081 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4082 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4083 It has to be done before elf_link_sort_relocs is called so that
4084 dynamic relocations are properly sorted. */
4085
4086 static bfd_boolean
4087 elf_i386_output_arch_local_syms
4088 (bfd *output_bfd ATTRIBUTE_UNUSED,
4089 struct bfd_link_info *info,
4090 void *flaginfo ATTRIBUTE_UNUSED,
4091 int (*func) (void *, const char *,
4092 Elf_Internal_Sym *,
4093 asection *,
4094 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4095 {
4096 struct elf_x86_link_hash_table *htab
4097 = elf_x86_hash_table (info, I386_ELF_DATA);
4098 if (htab == NULL)
4099 return FALSE;
4100
4101 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4102 htab_traverse (htab->loc_hash_table,
4103 elf_i386_finish_local_dynamic_symbol,
4104 info);
4105
4106 return TRUE;
4107 }
4108
4109 /* Forward declaration. */
4110 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4111
4112 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4113 dynamic relocations. */
4114
4115 static long
4116 elf_i386_get_synthetic_symtab (bfd *abfd,
4117 long symcount ATTRIBUTE_UNUSED,
4118 asymbol **syms ATTRIBUTE_UNUSED,
4119 long dynsymcount,
4120 asymbol **dynsyms,
4121 asymbol **ret)
4122 {
4123 long count, i, n;
4124 int j;
4125 bfd_byte *plt_contents;
4126 long relsize;
4127 const struct elf_x86_lazy_plt_layout *lazy_plt;
4128 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4129 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4130 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4131 asection *plt;
4132 bfd_vma got_addr;
4133 enum elf_x86_plt_type plt_type;
4134 struct elf_x86_plt plts[] =
4135 {
4136 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4137 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4138 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4139 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4140 };
4141
4142 *ret = NULL;
4143
4144 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4145 return 0;
4146
4147 if (dynsymcount <= 0)
4148 return 0;
4149
4150 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4151 if (relsize <= 0)
4152 return -1;
4153
4154 non_lazy_plt = NULL;
4155 /* Silence GCC 6. */
4156 lazy_plt = NULL;
4157 non_lazy_ibt_plt = NULL;
4158 lazy_ibt_plt = NULL;
4159 switch (get_elf_x86_backend_data (abfd)->target_os)
4160 {
4161 case is_normal:
4162 case is_solaris:
4163 non_lazy_plt = &elf_i386_non_lazy_plt;
4164 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4165 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4166 /* Fall through */
4167 case is_vxworks:
4168 lazy_plt = &elf_i386_lazy_plt;
4169 break;
4170 case is_nacl:
4171 lazy_plt = &elf_i386_nacl_plt;
4172 break;
4173 }
4174
4175 got_addr = 0;
4176
4177 count = 0;
4178 for (j = 0; plts[j].name != NULL; j++)
4179 {
4180 plt = bfd_get_section_by_name (abfd, plts[j].name);
4181 if (plt == NULL || plt->size == 0)
4182 continue;
4183
4184 /* Get the PLT section contents. */
4185 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4186 if (plt_contents == NULL)
4187 break;
4188 if (!bfd_get_section_contents (abfd, (asection *) plt,
4189 plt_contents, 0, plt->size))
4190 {
4191 free (plt_contents);
4192 break;
4193 }
4194
4195 /* Check what kind of PLT it is. */
4196 plt_type = plt_unknown;
4197 if (plts[j].type == plt_unknown
4198 && (plt->size >= (lazy_plt->plt0_entry_size
4199 + lazy_plt->plt_entry_size)))
4200 {
4201 /* Match lazy PLT first. */
4202 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4203 lazy_plt->plt0_got1_offset) == 0)
4204 {
4205 /* The fist entry in the lazy IBT PLT is the same as the
4206 normal lazy PLT. */
4207 if (lazy_ibt_plt != NULL
4208 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4209 lazy_ibt_plt->plt_entry,
4210 lazy_ibt_plt->plt_got_offset) == 0))
4211 plt_type = plt_lazy | plt_second;
4212 else
4213 plt_type = plt_lazy;
4214 }
4215 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4216 lazy_plt->plt0_got1_offset) == 0)
4217 {
4218 /* The fist entry in the PIC lazy IBT PLT is the same as
4219 the normal PIC lazy PLT. */
4220 if (lazy_ibt_plt != NULL
4221 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4222 lazy_ibt_plt->pic_plt_entry,
4223 lazy_ibt_plt->plt_got_offset) == 0))
4224 plt_type = plt_lazy | plt_pic | plt_second;
4225 else
4226 plt_type = plt_lazy | plt_pic;
4227 }
4228 }
4229
4230 if (non_lazy_plt != NULL
4231 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4232 && plt->size >= non_lazy_plt->plt_entry_size)
4233 {
4234 /* Match non-lazy PLT. */
4235 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4236 non_lazy_plt->plt_got_offset) == 0)
4237 plt_type = plt_non_lazy;
4238 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4239 non_lazy_plt->plt_got_offset) == 0)
4240 plt_type = plt_pic;
4241 }
4242
4243 if ((non_lazy_ibt_plt != NULL)
4244 && (plt_type == plt_unknown || plt_type == plt_second)
4245 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4246 {
4247 if (memcmp (plt_contents,
4248 non_lazy_ibt_plt->plt_entry,
4249 non_lazy_ibt_plt->plt_got_offset) == 0)
4250 {
4251 /* Match IBT PLT. */
4252 plt_type = plt_second;
4253 non_lazy_plt = non_lazy_ibt_plt;
4254 }
4255 else if (memcmp (plt_contents,
4256 non_lazy_ibt_plt->pic_plt_entry,
4257 non_lazy_ibt_plt->plt_got_offset) == 0)
4258 {
4259 /* Match PIC IBT PLT. */
4260 plt_type = plt_second | plt_pic;
4261 non_lazy_plt = non_lazy_ibt_plt;
4262 }
4263 }
4264
4265 if (plt_type == plt_unknown)
4266 {
4267 free (plt_contents);
4268 continue;
4269 }
4270
4271 plts[j].sec = plt;
4272 plts[j].type = plt_type;
4273
4274 if ((plt_type & plt_lazy))
4275 {
4276 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4277 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4278 /* Skip PLT0 in lazy PLT. */
4279 i = 1;
4280 }
4281 else
4282 {
4283 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4284 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4285 i = 0;
4286 }
4287
4288 /* Skip lazy PLT when the second PLT is used. */
4289 if ((plt_type & (plt_lazy | plt_second))
4290 == (plt_lazy | plt_second))
4291 plts[j].count = 0;
4292 else
4293 {
4294 n = plt->size / plts[j].plt_entry_size;
4295 plts[j].count = n;
4296 count += n - i;
4297 }
4298
4299 plts[j].contents = plt_contents;
4300
4301 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4302 if ((plt_type & plt_pic))
4303 got_addr = (bfd_vma) -1;
4304 }
4305
4306 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4307 got_addr, plts, dynsyms,
4308 ret);
4309 }
4310
4311 /* Set up i386 GNU properties. Return the first relocatable ELF input
4312 with GNU properties if found. Otherwise, return NULL. */
4313
4314 static bfd *
4315 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4316 {
4317 struct elf_x86_init_table init_table;
4318
4319 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4320 {
4321 case is_normal:
4322 case is_solaris:
4323 init_table.plt0_pad_byte = 0x0;
4324 init_table.lazy_plt = &elf_i386_lazy_plt;
4325 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4326 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4327 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4328 break;
4329 case is_vxworks:
4330 init_table.plt0_pad_byte = 0x90;
4331 init_table.lazy_plt = &elf_i386_lazy_plt;
4332 init_table.non_lazy_plt = NULL;
4333 init_table.lazy_ibt_plt = NULL;
4334 init_table.non_lazy_ibt_plt = NULL;
4335 break;
4336 case is_nacl:
4337 init_table.plt0_pad_byte = 0x90;
4338 init_table.lazy_plt = &elf_i386_nacl_plt;
4339 init_table.non_lazy_plt = NULL;
4340 init_table.lazy_ibt_plt = NULL;
4341 init_table.non_lazy_ibt_plt = NULL;
4342 break;
4343 }
4344
4345 init_table.r_info = elf32_r_info;
4346 init_table.r_sym = elf32_r_sym;
4347
4348 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4349 }
4350
4351 #define TARGET_LITTLE_SYM i386_elf32_vec
4352 #define TARGET_LITTLE_NAME "elf32-i386"
4353 #define ELF_ARCH bfd_arch_i386
4354 #define ELF_TARGET_ID I386_ELF_DATA
4355 #define ELF_MACHINE_CODE EM_386
4356 #define ELF_MAXPAGESIZE 0x1000
4357
4358 #define elf_backend_can_gc_sections 1
4359 #define elf_backend_can_refcount 1
4360 #define elf_backend_want_got_plt 1
4361 #define elf_backend_plt_readonly 1
4362 #define elf_backend_want_plt_sym 0
4363 #define elf_backend_got_header_size 12
4364 #define elf_backend_plt_alignment 4
4365 #define elf_backend_dtrel_excludes_plt 1
4366 #define elf_backend_extern_protected_data 1
4367 #define elf_backend_caches_rawsize 1
4368 #define elf_backend_want_dynrelro 1
4369
4370 /* Support RELA for objdump of prelink objects. */
4371 #define elf_info_to_howto elf_i386_info_to_howto_rel
4372 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4373
4374 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4375 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4376 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4377 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4378
4379 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4380 #define elf_backend_check_relocs elf_i386_check_relocs
4381 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4382 #define elf_backend_fake_sections elf_i386_fake_sections
4383 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4384 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4385 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4386 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4387 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4388 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4389 #define elf_backend_relocate_section elf_i386_relocate_section
4390 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4391 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4392
4393 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4394
4395 #define elf32_bed elf32_i386_bed
4396
4397 #include "elf32-target.h"
4398
4399 /* FreeBSD support. */
4400
4401 #undef TARGET_LITTLE_SYM
4402 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4403 #undef TARGET_LITTLE_NAME
4404 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4405 #undef ELF_OSABI
4406 #define ELF_OSABI ELFOSABI_FREEBSD
4407
4408 /* The kernel recognizes executables as valid only if they carry a
4409 "FreeBSD" label in the ELF header. So we put this label on all
4410 executables and (for simplicity) also all other object files. */
4411
4412 static bfd_boolean
4413 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4414 {
4415 if (!_bfd_elf_init_file_header (abfd, info))
4416 return FALSE;
4417
4418 #ifdef OLD_FREEBSD_ABI_LABEL
4419 {
4420 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4421 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4422 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4423 }
4424 #endif
4425 return TRUE;
4426 }
4427
4428 #undef elf_backend_init_file_header
4429 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4430 #undef elf32_bed
4431 #define elf32_bed elf32_i386_fbsd_bed
4432
4433 #undef elf_backend_add_symbol_hook
4434
4435 #include "elf32-target.h"
4436
4437 #undef elf_backend_init_file_header
4438
4439 /* Solaris 2. */
4440
4441 #undef TARGET_LITTLE_SYM
4442 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4443 #undef TARGET_LITTLE_NAME
4444 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4445
4446 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4447 {
4448 is_solaris /* os */
4449 };
4450
4451 #undef elf_backend_arch_data
4452 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4453
4454 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4455 objects won't be recognized. */
4456 #undef ELF_OSABI
4457
4458 #undef elf32_bed
4459 #define elf32_bed elf32_i386_sol2_bed
4460
4461 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4462 boundary. */
4463 #undef elf_backend_static_tls_alignment
4464 #define elf_backend_static_tls_alignment 8
4465
4466 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4467
4468 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4469 File, p.63. */
4470 #undef elf_backend_want_plt_sym
4471 #define elf_backend_want_plt_sym 1
4472
4473 #undef elf_backend_strtab_flags
4474 #define elf_backend_strtab_flags SHF_STRINGS
4475
4476 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4477 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4478 FALSE otherwise. ISECTION is the best guess matching section from the
4479 input bfd IBFD, but it might be NULL. */
4480
4481 static bfd_boolean
4482 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4483 bfd *obfd ATTRIBUTE_UNUSED,
4484 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4485 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4486 {
4487 /* PR 19938: FIXME: Need to add code for setting the sh_info
4488 and sh_link fields of Solaris specific section types. */
4489 return FALSE;
4490
4491 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4492 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4493
4494 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4495
4496 The following values should be set:
4497
4498 Type Link Info
4499 -----------------------------------------------------------------------------
4500 SHT_SUNW_ancillary The section header index of 0
4501 [0x6fffffee] the associated string table.
4502
4503 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4504 [0x6ffffff0] the associated symbol table. section header index of
4505 the associated
4506 SHT_SUNW_capchain table,
4507 otherwise 0.
4508
4509 SHT_SUNW_symsort The section header index of 0
4510 [0x6ffffff1] the associated symbol table.
4511
4512 SHT_SUNW_tlssort The section header index of 0
4513 [0x6ffffff2] the associated symbol table.
4514
4515 SHT_SUNW_LDYNSYM The section header index of One greater than the
4516 [0x6ffffff3] the associated string table. symbol table index of the
4517 This index is the same string last local symbol,
4518 table used by the SHT_DYNSYM STB_LOCAL. Since
4519 section. SHT_SUNW_LDYNSYM only
4520 contains local symbols,
4521 sh_info is equivalent to
4522 the number of symbols in
4523 the table.
4524
4525 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4526 [0x6ffffff5] the section header index of to named strings, the
4527 the associated section header index of
4528 SHT_SUNW_capinfo table, the associated string
4529 otherwise 0. table, otherwise 0.
4530
4531 SHT_SUNW_move The section header index of 0
4532 [0x6ffffffa] the associated symbol table.
4533
4534 SHT_SUNW_COMDAT 0 0
4535 [0x6ffffffb]
4536
4537 SHT_SUNW_syminfo The section header index of The section header index
4538 [0x6ffffffc] the associated symbol table. of the associated
4539 .dynamic section.
4540
4541 SHT_SUNW_verdef The section header index of The number of version
4542 [0x6ffffffd] the associated string table. definitions within the
4543 section.
4544
4545 SHT_SUNW_verneed The section header index of The number of version
4546 [0x6ffffffe] the associated string table. dependencies within the
4547 section.
4548
4549 SHT_SUNW_versym The section header index of 0
4550 [0x6fffffff] the associated symbol table. */
4551 }
4552
4553 #undef elf_backend_copy_special_section_fields
4554 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4555
4556 #include "elf32-target.h"
4557
4558 /* Intel MCU support. */
4559
4560 static bfd_boolean
4561 elf32_iamcu_elf_object_p (bfd *abfd)
4562 {
4563 /* Set the right machine number for an IAMCU elf32 file. */
4564 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4565 return TRUE;
4566 }
4567
4568 #undef TARGET_LITTLE_SYM
4569 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4570 #undef TARGET_LITTLE_NAME
4571 #define TARGET_LITTLE_NAME "elf32-iamcu"
4572 #undef ELF_ARCH
4573 #define ELF_ARCH bfd_arch_iamcu
4574
4575 #undef ELF_MACHINE_CODE
4576 #define ELF_MACHINE_CODE EM_IAMCU
4577
4578 #undef elf_backend_arch_data
4579 #define elf_backend_arch_data &elf_i386_arch_bed
4580
4581 #undef ELF_OSABI
4582
4583 #undef elf32_bed
4584 #define elf32_bed elf32_iamcu_bed
4585
4586 #undef elf_backend_object_p
4587 #define elf_backend_object_p elf32_iamcu_elf_object_p
4588
4589 #undef elf_backend_static_tls_alignment
4590
4591 #undef elf_backend_want_plt_sym
4592 #define elf_backend_want_plt_sym 0
4593
4594 #undef elf_backend_strtab_flags
4595 #undef elf_backend_copy_special_section_fields
4596
4597 #include "elf32-target.h"
4598
4599 /* Restore defaults. */
4600 #undef ELF_ARCH
4601 #define ELF_ARCH bfd_arch_i386
4602 #undef ELF_MACHINE_CODE
4603 #define ELF_MACHINE_CODE EM_386
4604
4605 /* Native Client support. */
4606
4607 #undef TARGET_LITTLE_SYM
4608 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4609 #undef TARGET_LITTLE_NAME
4610 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4611 #undef elf32_bed
4612 #define elf32_bed elf32_i386_nacl_bed
4613
4614 #undef ELF_MAXPAGESIZE
4615 #define ELF_MAXPAGESIZE 0x10000
4616
4617 /* Restore defaults. */
4618 #undef ELF_OSABI
4619 #undef elf_backend_want_plt_sym
4620 #define elf_backend_want_plt_sym 0
4621 #undef elf_backend_static_tls_alignment
4622
4623 /* NaCl uses substantially different PLT entries for the same effects. */
4624
4625 #undef elf_backend_plt_alignment
4626 #define elf_backend_plt_alignment 5
4627 #define NACL_PLT_ENTRY_SIZE 64
4628 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4629
4630 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4631 {
4632 0xff, 0x35, /* pushl contents of address */
4633 0, 0, 0, 0, /* replaced with address of .got + 4. */
4634 0x8b, 0x0d, /* movl contents of address, %ecx */
4635 0, 0, 0, 0, /* replaced with address of .got + 8. */
4636 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4637 0xff, 0xe1 /* jmp *%ecx */
4638 };
4639
4640 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4641 {
4642 0x8b, 0x0d, /* movl contents of address, %ecx */
4643 0, 0, 0, 0, /* replaced with GOT slot address. */
4644 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4645 0xff, 0xe1, /* jmp *%ecx */
4646
4647 /* Pad to the next 32-byte boundary with nop instructions. */
4648 0x90,
4649 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4650 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4651
4652 /* Lazy GOT entries point here (32-byte aligned). */
4653 0x68, /* pushl immediate */
4654 0, 0, 0, 0, /* replaced with reloc offset. */
4655 0xe9, /* jmp relative */
4656 0, 0, 0, 0, /* replaced with offset to .plt. */
4657
4658 /* Pad to the next 32-byte boundary with nop instructions. */
4659 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4660 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4661 0x90, 0x90
4662 };
4663
4664 static const bfd_byte
4665 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4666 {
4667 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4668 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4669 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4670 0xff, 0xe1, /* jmp *%ecx */
4671
4672 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4673 so pad to that size with nop instructions. */
4674 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4675 };
4676
4677 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4678 {
4679 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4680 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4681 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4682 0xff, 0xe1, /* jmp *%ecx */
4683
4684 /* Pad to the next 32-byte boundary with nop instructions. */
4685 0x90,
4686 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4687 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4688
4689 /* Lazy GOT entries point here (32-byte aligned). */
4690 0x68, /* pushl immediate */
4691 0, 0, 0, 0, /* replaced with offset into relocation table. */
4692 0xe9, /* jmp relative */
4693 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4694
4695 /* Pad to the next 32-byte boundary with nop instructions. */
4696 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4697 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4698 0x90, 0x90
4699 };
4700
4701 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4702 {
4703 #if (PLT_CIE_LENGTH != 20 \
4704 || PLT_FDE_LENGTH != 36 \
4705 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4706 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4707 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4708 #endif
4709 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4710 0, 0, 0, 0, /* CIE ID */
4711 1, /* CIE version */
4712 'z', 'R', 0, /* Augmentation string */
4713 1, /* Code alignment factor */
4714 0x7c, /* Data alignment factor: -4 */
4715 8, /* Return address column */
4716 1, /* Augmentation size */
4717 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4718 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4719 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4720 DW_CFA_nop, DW_CFA_nop,
4721
4722 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4723 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4724 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4725 0, 0, 0, 0, /* .plt size goes here */
4726 0, /* Augmentation size */
4727 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4728 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4729 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4730 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4731 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4732 13, /* Block length */
4733 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4734 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4735 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4736 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4737 DW_CFA_nop, DW_CFA_nop
4738 };
4739
4740 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4741 {
4742 elf_i386_nacl_plt0_entry, /* plt0_entry */
4743 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4744 elf_i386_nacl_plt_entry, /* plt_entry */
4745 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4746 NULL, /* plt_tlsdesc_entry */
4747 0, /* plt_tlsdesc_entry_size*/
4748 0, /* plt_tlsdesc_got1_offset */
4749 0, /* plt_tlsdesc_got2_offset */
4750 0, /* plt_tlsdesc_got1_insn_end */
4751 0, /* plt_tlsdesc_got2_insn_end */
4752 2, /* plt0_got1_offset */
4753 8, /* plt0_got2_offset */
4754 0, /* plt0_got2_insn_end */
4755 2, /* plt_got_offset */
4756 33, /* plt_reloc_offset */
4757 38, /* plt_plt_offset */
4758 0, /* plt_got_insn_size */
4759 0, /* plt_plt_insn_end */
4760 32, /* plt_lazy_offset */
4761 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4762 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4763 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4764 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4765 };
4766
4767 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4768 {
4769 is_nacl /* os */
4770 };
4771
4772 static bfd_boolean
4773 elf32_i386_nacl_elf_object_p (bfd *abfd)
4774 {
4775 /* Set the right machine number for a NaCl i386 ELF32 file. */
4776 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4777 return TRUE;
4778 }
4779
4780 #undef elf_backend_arch_data
4781 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4782
4783 #undef elf_backend_object_p
4784 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4785 #undef elf_backend_modify_segment_map
4786 #define elf_backend_modify_segment_map nacl_modify_segment_map
4787 #undef elf_backend_modify_headers
4788 #define elf_backend_modify_headers nacl_modify_headers
4789 #undef elf_backend_final_write_processing
4790 #define elf_backend_final_write_processing nacl_final_write_processing
4791
4792 #include "elf32-target.h"
4793
4794 /* Restore defaults. */
4795 #undef elf_backend_object_p
4796 #undef elf_backend_modify_segment_map
4797 #undef elf_backend_modify_headers
4798 #undef elf_backend_final_write_processing
4799
4800 /* VxWorks support. */
4801
4802 #undef TARGET_LITTLE_SYM
4803 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4804 #undef TARGET_LITTLE_NAME
4805 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4806 #undef ELF_OSABI
4807 #undef ELF_MAXPAGESIZE
4808 #define ELF_MAXPAGESIZE 0x1000
4809 #undef elf_backend_plt_alignment
4810 #define elf_backend_plt_alignment 4
4811
4812 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4813 {
4814 is_vxworks /* os */
4815 };
4816
4817 #undef elf_backend_arch_data
4818 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4819
4820 #undef elf_backend_relocs_compatible
4821 #undef elf_backend_add_symbol_hook
4822 #define elf_backend_add_symbol_hook \
4823 elf_vxworks_add_symbol_hook
4824 #undef elf_backend_link_output_symbol_hook
4825 #define elf_backend_link_output_symbol_hook \
4826 elf_vxworks_link_output_symbol_hook
4827 #undef elf_backend_emit_relocs
4828 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4829 #undef elf_backend_final_write_processing
4830 #define elf_backend_final_write_processing \
4831 elf_vxworks_final_write_processing
4832 #undef elf_backend_static_tls_alignment
4833
4834 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4835 define it. */
4836 #undef elf_backend_want_plt_sym
4837 #define elf_backend_want_plt_sym 1
4838
4839 #undef elf32_bed
4840 #define elf32_bed elf32_i386_vxworks_bed
4841
4842 #include "elf32-target.h"
GDB Binutils - Deliverables
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