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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2016 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 "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
387 abfd, (int) r_type);
388 indx = R_386_NONE;
389 }
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
392 return NULL;
393 return &elf_howto_table[indx];
394 }
395
396 static void
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
398 arelent *cache_ptr,
399 Elf_Internal_Rela *dst)
400 {
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
403 }
404
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
410
411 static bfd_boolean
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
413 {
414 if (name[0] == '.' && name[1] == 'X')
415 return TRUE;
416
417 return _bfd_elf_is_local_label_name (abfd, name);
418 }
419 \f
420 /* Support for core dump NOTE sections. */
421
422 static bfd_boolean
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
424 {
425 int offset;
426 size_t size;
427
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
429 {
430 int pr_version = bfd_get_32 (abfd, note->descdata);
431
432 if (pr_version != 1)
433 return FALSE;
434
435 /* pr_cursig */
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437
438 /* pr_pid */
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
440
441 /* pr_reg */
442 offset = 28;
443 size = bfd_get_32 (abfd, note->descdata + 8);
444 }
445 else
446 {
447 switch (note->descsz)
448 {
449 default:
450 return FALSE;
451
452 case 144: /* Linux/i386 */
453 /* pr_cursig */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455
456 /* pr_pid */
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
458
459 /* pr_reg */
460 offset = 72;
461 size = 68;
462
463 break;
464 }
465 }
466
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
470 }
471
472 static bfd_boolean
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
474 {
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
476 {
477 int pr_version = bfd_get_32 (abfd, note->descdata);
478
479 if (pr_version != 1)
480 return FALSE;
481
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
486 }
487 else
488 {
489 switch (note->descsz)
490 {
491 default:
492 return FALSE;
493
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
501 }
502 }
503
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
507 {
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
510
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
513 }
514
515 return TRUE;
516 }
517 \f
518 /* Functions for the i386 ELF linker.
519
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
522 following:
523
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
530
531
532 /* The name of the dynamic interpreter. This is put in the .interp
533 section. */
534
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the procedure linkage table. */
544
545 #define PLT_ENTRY_SIZE 16
546
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
550
551 static const bfd_byte elf_i386_plt0_entry[12] =
552 {
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 };
571
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
574
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
576 {
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
579 };
580
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
582
583 static const bfd_byte elf_i386_pic_plt_entry[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 GOT procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_got_plt_entry[8] =
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 GOT procedure linkage table look like this. */
603
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* .eh_frame covering the .plt section. */
612
613 static const bfd_byte elf_i386_eh_frame_plt[] =
614 {
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
621 1, /* CIE version */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
631
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
648 };
649
650 struct elf_i386_plt_layout
651 {
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
655
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
659
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
663
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
668
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
671
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
674
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
677
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
681 };
682
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
685
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
688 {
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
703 };
704 \f
705
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
711
712 /* Architecture-specific backend data for i386. */
713
714 struct elf_i386_backend_data
715 {
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
718
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
721
722 /* True if the target system is VxWorks. */
723 int is_vxworks;
724 };
725
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
729
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
732 {
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
735 0, /* is_vxworks */
736 };
737
738 #define elf_backend_arch_data &elf_i386_arch_bed
739
740 /* Is a undefined weak symbol which is resolved to 0. Reference to an
741 undefined weak symbol is resolved to 0 when building executable if
742 it isn't dynamic and
743 1. Has non-GOT/non-PLT relocations in text section. Or
744 2. Has no GOT/PLT relocation.
745 */
746 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
747 ((EH)->elf.root.type == bfd_link_hash_undefweak \
748 && bfd_link_executable (INFO) \
749 && (elf_i386_hash_table (INFO)->interp == NULL \
750 || !(EH)->has_got_reloc \
751 || (EH)->has_non_got_reloc \
752 || !(INFO)->dynamic_undefined_weak))
753
754 /* i386 ELF linker hash entry. */
755
756 struct elf_i386_link_hash_entry
757 {
758 struct elf_link_hash_entry elf;
759
760 /* Track dynamic relocs copied for this symbol. */
761 struct elf_dyn_relocs *dyn_relocs;
762
763 #define GOT_UNKNOWN 0
764 #define GOT_NORMAL 1
765 #define GOT_TLS_GD 2
766 #define GOT_TLS_IE 4
767 #define GOT_TLS_IE_POS 5
768 #define GOT_TLS_IE_NEG 6
769 #define GOT_TLS_IE_BOTH 7
770 #define GOT_TLS_GDESC 8
771 #define GOT_TLS_GD_BOTH_P(type) \
772 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
773 #define GOT_TLS_GD_P(type) \
774 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
775 #define GOT_TLS_GDESC_P(type) \
776 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
777 #define GOT_TLS_GD_ANY_P(type) \
778 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
779 unsigned char tls_type;
780
781 /* Symbol is referenced by R_386_GOTOFF relocation. */
782 unsigned int gotoff_ref : 1;
783
784 /* Symbol has GOT or PLT relocations. */
785 unsigned int has_got_reloc : 1;
786
787 /* Symbol has non-GOT/non-PLT relocations in text sections. */
788 unsigned int has_non_got_reloc : 1;
789
790 /* Reference count of C/C++ function pointer relocations in read-write
791 section which can be resolved at run-time. */
792 bfd_signed_vma func_pointer_refcount;
793
794 /* Information about the GOT PLT entry. Filled when there are both
795 GOT and PLT relocations against the same function. */
796 union gotplt_union plt_got;
797
798 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
799 starting at the end of the jump table. */
800 bfd_vma tlsdesc_got;
801 };
802
803 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
804
805 struct elf_i386_obj_tdata
806 {
807 struct elf_obj_tdata root;
808
809 /* tls_type for each local got entry. */
810 char *local_got_tls_type;
811
812 /* GOTPLT entries for TLS descriptors. */
813 bfd_vma *local_tlsdesc_gotent;
814 };
815
816 #define elf_i386_tdata(abfd) \
817 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
818
819 #define elf_i386_local_got_tls_type(abfd) \
820 (elf_i386_tdata (abfd)->local_got_tls_type)
821
822 #define elf_i386_local_tlsdesc_gotent(abfd) \
823 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
824
825 #define is_i386_elf(bfd) \
826 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
827 && elf_tdata (bfd) != NULL \
828 && elf_object_id (bfd) == I386_ELF_DATA)
829
830 static bfd_boolean
831 elf_i386_mkobject (bfd *abfd)
832 {
833 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
834 I386_ELF_DATA);
835 }
836
837 /* i386 ELF linker hash table. */
838
839 struct elf_i386_link_hash_table
840 {
841 struct elf_link_hash_table elf;
842
843 /* Short-cuts to get to dynamic linker sections. */
844 asection *interp;
845 asection *sdynbss;
846 asection *srelbss;
847 asection *plt_eh_frame;
848 asection *plt_got;
849
850 union
851 {
852 bfd_signed_vma refcount;
853 bfd_vma offset;
854 } tls_ldm_got;
855
856 /* The amount of space used by the reserved portion of the sgotplt
857 section, plus whatever space is used by the jump slots. */
858 bfd_vma sgotplt_jump_table_size;
859
860 /* Small local sym cache. */
861 struct sym_cache sym_cache;
862
863 /* _TLS_MODULE_BASE_ symbol. */
864 struct bfd_link_hash_entry *tls_module_base;
865
866 /* Used by local STT_GNU_IFUNC symbols. */
867 htab_t loc_hash_table;
868 void * loc_hash_memory;
869
870 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
871 asection *srelplt2;
872
873 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
874 bfd_vma next_tls_desc_index;
875
876 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
877 bfd_vma next_jump_slot_index;
878
879 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
880 bfd_vma next_irelative_index;
881 };
882
883 /* Get the i386 ELF linker hash table from a link_info structure. */
884
885 #define elf_i386_hash_table(p) \
886 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
887 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
888
889 #define elf_i386_compute_jump_table_size(htab) \
890 ((htab)->elf.srelplt->reloc_count * 4)
891
892 /* Create an entry in an i386 ELF linker hash table. */
893
894 static struct bfd_hash_entry *
895 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
896 struct bfd_hash_table *table,
897 const char *string)
898 {
899 /* Allocate the structure if it has not already been allocated by a
900 subclass. */
901 if (entry == NULL)
902 {
903 entry = (struct bfd_hash_entry *)
904 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
905 if (entry == NULL)
906 return entry;
907 }
908
909 /* Call the allocation method of the superclass. */
910 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
911 if (entry != NULL)
912 {
913 struct elf_i386_link_hash_entry *eh;
914
915 eh = (struct elf_i386_link_hash_entry *) entry;
916 eh->dyn_relocs = NULL;
917 eh->tls_type = GOT_UNKNOWN;
918 eh->gotoff_ref = 0;
919 eh->has_got_reloc = 0;
920 eh->has_non_got_reloc = 0;
921 eh->func_pointer_refcount = 0;
922 eh->plt_got.offset = (bfd_vma) -1;
923 eh->tlsdesc_got = (bfd_vma) -1;
924 }
925
926 return entry;
927 }
928
929 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
930 for local symbol so that we can handle local STT_GNU_IFUNC symbols
931 as global symbol. We reuse indx and dynstr_index for local symbol
932 hash since they aren't used by global symbols in this backend. */
933
934 static hashval_t
935 elf_i386_local_htab_hash (const void *ptr)
936 {
937 struct elf_link_hash_entry *h
938 = (struct elf_link_hash_entry *) ptr;
939 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
940 }
941
942 /* Compare local hash entries. */
943
944 static int
945 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
946 {
947 struct elf_link_hash_entry *h1
948 = (struct elf_link_hash_entry *) ptr1;
949 struct elf_link_hash_entry *h2
950 = (struct elf_link_hash_entry *) ptr2;
951
952 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
953 }
954
955 /* Find and/or create a hash entry for local symbol. */
956
957 static struct elf_link_hash_entry *
958 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
959 bfd *abfd, const Elf_Internal_Rela *rel,
960 bfd_boolean create)
961 {
962 struct elf_i386_link_hash_entry e, *ret;
963 asection *sec = abfd->sections;
964 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
965 ELF32_R_SYM (rel->r_info));
966 void **slot;
967
968 e.elf.indx = sec->id;
969 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
970 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
971 create ? INSERT : NO_INSERT);
972
973 if (!slot)
974 return NULL;
975
976 if (*slot)
977 {
978 ret = (struct elf_i386_link_hash_entry *) *slot;
979 return &ret->elf;
980 }
981
982 ret = (struct elf_i386_link_hash_entry *)
983 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
984 sizeof (struct elf_i386_link_hash_entry));
985 if (ret)
986 {
987 memset (ret, 0, sizeof (*ret));
988 ret->elf.indx = sec->id;
989 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
990 ret->elf.dynindx = -1;
991 ret->func_pointer_refcount = 0;
992 ret->plt_got.offset = (bfd_vma) -1;
993 *slot = ret;
994 }
995 return &ret->elf;
996 }
997
998 /* Destroy an i386 ELF linker hash table. */
999
1000 static void
1001 elf_i386_link_hash_table_free (bfd *obfd)
1002 {
1003 struct elf_i386_link_hash_table *htab
1004 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1005
1006 if (htab->loc_hash_table)
1007 htab_delete (htab->loc_hash_table);
1008 if (htab->loc_hash_memory)
1009 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1010 _bfd_elf_link_hash_table_free (obfd);
1011 }
1012
1013 /* Create an i386 ELF linker hash table. */
1014
1015 static struct bfd_link_hash_table *
1016 elf_i386_link_hash_table_create (bfd *abfd)
1017 {
1018 struct elf_i386_link_hash_table *ret;
1019 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1020
1021 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1022 if (ret == NULL)
1023 return NULL;
1024
1025 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1026 elf_i386_link_hash_newfunc,
1027 sizeof (struct elf_i386_link_hash_entry),
1028 I386_ELF_DATA))
1029 {
1030 free (ret);
1031 return NULL;
1032 }
1033
1034 ret->loc_hash_table = htab_try_create (1024,
1035 elf_i386_local_htab_hash,
1036 elf_i386_local_htab_eq,
1037 NULL);
1038 ret->loc_hash_memory = objalloc_create ();
1039 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1040 {
1041 elf_i386_link_hash_table_free (abfd);
1042 return NULL;
1043 }
1044 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1045
1046 return &ret->elf.root;
1047 }
1048
1049 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1050 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1051 hash table. */
1052
1053 static bfd_boolean
1054 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1055 {
1056 struct elf_i386_link_hash_table *htab;
1057
1058 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1059 return FALSE;
1060
1061 htab = elf_i386_hash_table (info);
1062 if (htab == NULL)
1063 return FALSE;
1064
1065 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1066 if (!htab->sdynbss)
1067 abort ();
1068
1069 if (bfd_link_executable (info))
1070 {
1071 /* Always allow copy relocs for building executables. */
1072 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1073 if (s == NULL)
1074 {
1075 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1076 s = bfd_make_section_anyway_with_flags (dynobj,
1077 ".rel.bss",
1078 (bed->dynamic_sec_flags
1079 | SEC_READONLY));
1080 if (s == NULL
1081 || ! bfd_set_section_alignment (dynobj, s,
1082 bed->s->log_file_align))
1083 return FALSE;
1084 }
1085 htab->srelbss = s;
1086 }
1087
1088 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1089 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1090 &htab->srelplt2))
1091 return FALSE;
1092
1093 if (!info->no_ld_generated_unwind_info
1094 && htab->plt_eh_frame == NULL
1095 && htab->elf.splt != NULL)
1096 {
1097 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1098 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED);
1100 htab->plt_eh_frame
1101 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1102 if (htab->plt_eh_frame == NULL
1103 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1104 return FALSE;
1105 }
1106
1107 return TRUE;
1108 }
1109
1110 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1111
1112 static void
1113 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1114 struct elf_link_hash_entry *dir,
1115 struct elf_link_hash_entry *ind)
1116 {
1117 struct elf_i386_link_hash_entry *edir, *eind;
1118
1119 edir = (struct elf_i386_link_hash_entry *) dir;
1120 eind = (struct elf_i386_link_hash_entry *) ind;
1121
1122 if (eind->dyn_relocs != NULL)
1123 {
1124 if (edir->dyn_relocs != NULL)
1125 {
1126 struct elf_dyn_relocs **pp;
1127 struct elf_dyn_relocs *p;
1128
1129 /* Add reloc counts against the indirect sym to the direct sym
1130 list. Merge any entries against the same section. */
1131 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1132 {
1133 struct elf_dyn_relocs *q;
1134
1135 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1136 if (q->sec == p->sec)
1137 {
1138 q->pc_count += p->pc_count;
1139 q->count += p->count;
1140 *pp = p->next;
1141 break;
1142 }
1143 if (q == NULL)
1144 pp = &p->next;
1145 }
1146 *pp = edir->dyn_relocs;
1147 }
1148
1149 edir->dyn_relocs = eind->dyn_relocs;
1150 eind->dyn_relocs = NULL;
1151 }
1152
1153 if (ind->root.type == bfd_link_hash_indirect
1154 && dir->got.refcount <= 0)
1155 {
1156 edir->tls_type = eind->tls_type;
1157 eind->tls_type = GOT_UNKNOWN;
1158 }
1159
1160 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1161 generate a R_386_COPY reloc. */
1162 edir->gotoff_ref |= eind->gotoff_ref;
1163
1164 edir->has_got_reloc |= eind->has_got_reloc;
1165 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1166
1167 if (ELIMINATE_COPY_RELOCS
1168 && ind->root.type != bfd_link_hash_indirect
1169 && dir->dynamic_adjusted)
1170 {
1171 /* If called to transfer flags for a weakdef during processing
1172 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1173 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1174 dir->ref_dynamic |= ind->ref_dynamic;
1175 dir->ref_regular |= ind->ref_regular;
1176 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1177 dir->needs_plt |= ind->needs_plt;
1178 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1179 }
1180 else
1181 {
1182 if (eind->func_pointer_refcount > 0)
1183 {
1184 edir->func_pointer_refcount += eind->func_pointer_refcount;
1185 eind->func_pointer_refcount = 0;
1186 }
1187
1188 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1189 }
1190 }
1191
1192 /* Return TRUE if the TLS access code sequence support transition
1193 from R_TYPE. */
1194
1195 static bfd_boolean
1196 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1197 bfd_byte *contents,
1198 Elf_Internal_Shdr *symtab_hdr,
1199 struct elf_link_hash_entry **sym_hashes,
1200 unsigned int r_type,
1201 const Elf_Internal_Rela *rel,
1202 const Elf_Internal_Rela *relend)
1203 {
1204 unsigned int val, type;
1205 unsigned long r_symndx;
1206 struct elf_link_hash_entry *h;
1207 bfd_vma offset;
1208
1209 /* Get the section contents. */
1210 if (contents == NULL)
1211 {
1212 if (elf_section_data (sec)->this_hdr.contents != NULL)
1213 contents = elf_section_data (sec)->this_hdr.contents;
1214 else
1215 {
1216 /* FIXME: How to better handle error condition? */
1217 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1218 return FALSE;
1219
1220 /* Cache the section contents for elf_link_input_bfd. */
1221 elf_section_data (sec)->this_hdr.contents = contents;
1222 }
1223 }
1224
1225 offset = rel->r_offset;
1226 switch (r_type)
1227 {
1228 case R_386_TLS_GD:
1229 case R_386_TLS_LDM:
1230 if (offset < 2 || (rel + 1) >= relend)
1231 return FALSE;
1232
1233 type = bfd_get_8 (abfd, contents + offset - 2);
1234 if (r_type == R_386_TLS_GD)
1235 {
1236 /* Check transition from GD access model. Only
1237 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1238 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1239 can transit to different access model. */
1240 if ((offset + 10) > sec->size ||
1241 (type != 0x8d && type != 0x04))
1242 return FALSE;
1243
1244 val = bfd_get_8 (abfd, contents + offset - 1);
1245 if (type == 0x04)
1246 {
1247 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1248 if (offset < 3)
1249 return FALSE;
1250
1251 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1252 return FALSE;
1253
1254 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1255 return FALSE;
1256 }
1257 else
1258 {
1259 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1260 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1261 return FALSE;
1262
1263 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1264 return FALSE;
1265 }
1266 }
1267 else
1268 {
1269 /* Check transition from LD access model. Only
1270 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1271 can transit to different access model. */
1272 if (type != 0x8d || (offset + 9) > sec->size)
1273 return FALSE;
1274
1275 val = bfd_get_8 (abfd, contents + offset - 1);
1276 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1277 return FALSE;
1278 }
1279
1280 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1281 return FALSE;
1282
1283 r_symndx = ELF32_R_SYM (rel[1].r_info);
1284 if (r_symndx < symtab_hdr->sh_info)
1285 return FALSE;
1286
1287 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1288 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1289 may be versioned. */
1290 return (h != NULL
1291 && h->root.root.string != NULL
1292 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1293 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1294 && (strncmp (h->root.root.string, "___tls_get_addr",
1295 15) == 0));
1296
1297 case R_386_TLS_IE:
1298 /* Check transition from IE access model:
1299 movl foo@indntpoff(%rip), %eax
1300 movl foo@indntpoff(%rip), %reg
1301 addl foo@indntpoff(%rip), %reg
1302 */
1303
1304 if (offset < 1 || (offset + 4) > sec->size)
1305 return FALSE;
1306
1307 /* Check "movl foo@tpoff(%rip), %eax" first. */
1308 val = bfd_get_8 (abfd, contents + offset - 1);
1309 if (val == 0xa1)
1310 return TRUE;
1311
1312 if (offset < 2)
1313 return FALSE;
1314
1315 /* Check movl|addl foo@tpoff(%rip), %reg. */
1316 type = bfd_get_8 (abfd, contents + offset - 2);
1317 return ((type == 0x8b || type == 0x03)
1318 && (val & 0xc7) == 0x05);
1319
1320 case R_386_TLS_GOTIE:
1321 case R_386_TLS_IE_32:
1322 /* Check transition from {IE_32,GOTIE} access model:
1323 subl foo@{tpoff,gontoff}(%reg1), %reg2
1324 movl foo@{tpoff,gontoff}(%reg1), %reg2
1325 addl foo@{tpoff,gontoff}(%reg1), %reg2
1326 */
1327
1328 if (offset < 2 || (offset + 4) > sec->size)
1329 return FALSE;
1330
1331 val = bfd_get_8 (abfd, contents + offset - 1);
1332 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1333 return FALSE;
1334
1335 type = bfd_get_8 (abfd, contents + offset - 2);
1336 return type == 0x8b || type == 0x2b || type == 0x03;
1337
1338 case R_386_TLS_GOTDESC:
1339 /* Check transition from GDesc access model:
1340 leal x@tlsdesc(%ebx), %eax
1341
1342 Make sure it's a leal adding ebx to a 32-bit offset
1343 into any register, although it's probably almost always
1344 going to be eax. */
1345
1346 if (offset < 2 || (offset + 4) > sec->size)
1347 return FALSE;
1348
1349 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1350 return FALSE;
1351
1352 val = bfd_get_8 (abfd, contents + offset - 1);
1353 return (val & 0xc7) == 0x83;
1354
1355 case R_386_TLS_DESC_CALL:
1356 /* Check transition from GDesc access model:
1357 call *x@tlsdesc(%rax)
1358 */
1359 if (offset + 2 <= sec->size)
1360 {
1361 /* Make sure that it's a call *x@tlsdesc(%rax). */
1362 static const unsigned char call[] = { 0xff, 0x10 };
1363 return memcmp (contents + offset, call, 2) == 0;
1364 }
1365
1366 return FALSE;
1367
1368 default:
1369 abort ();
1370 }
1371 }
1372
1373 /* Return TRUE if the TLS access transition is OK or no transition
1374 will be performed. Update R_TYPE if there is a transition. */
1375
1376 static bfd_boolean
1377 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1378 asection *sec, bfd_byte *contents,
1379 Elf_Internal_Shdr *symtab_hdr,
1380 struct elf_link_hash_entry **sym_hashes,
1381 unsigned int *r_type, int tls_type,
1382 const Elf_Internal_Rela *rel,
1383 const Elf_Internal_Rela *relend,
1384 struct elf_link_hash_entry *h,
1385 unsigned long r_symndx)
1386 {
1387 unsigned int from_type = *r_type;
1388 unsigned int to_type = from_type;
1389 bfd_boolean check = TRUE;
1390
1391 /* Skip TLS transition for functions. */
1392 if (h != NULL
1393 && (h->type == STT_FUNC
1394 || h->type == STT_GNU_IFUNC))
1395 return TRUE;
1396
1397 switch (from_type)
1398 {
1399 case R_386_TLS_GD:
1400 case R_386_TLS_GOTDESC:
1401 case R_386_TLS_DESC_CALL:
1402 case R_386_TLS_IE_32:
1403 case R_386_TLS_IE:
1404 case R_386_TLS_GOTIE:
1405 if (bfd_link_executable (info))
1406 {
1407 if (h == NULL)
1408 to_type = R_386_TLS_LE_32;
1409 else if (from_type != R_386_TLS_IE
1410 && from_type != R_386_TLS_GOTIE)
1411 to_type = R_386_TLS_IE_32;
1412 }
1413
1414 /* When we are called from elf_i386_relocate_section, CONTENTS
1415 isn't NULL and there may be additional transitions based on
1416 TLS_TYPE. */
1417 if (contents != NULL)
1418 {
1419 unsigned int new_to_type = to_type;
1420
1421 if (bfd_link_executable (info)
1422 && h != NULL
1423 && h->dynindx == -1
1424 && (tls_type & GOT_TLS_IE))
1425 new_to_type = R_386_TLS_LE_32;
1426
1427 if (to_type == R_386_TLS_GD
1428 || to_type == R_386_TLS_GOTDESC
1429 || to_type == R_386_TLS_DESC_CALL)
1430 {
1431 if (tls_type == GOT_TLS_IE_POS)
1432 new_to_type = R_386_TLS_GOTIE;
1433 else if (tls_type & GOT_TLS_IE)
1434 new_to_type = R_386_TLS_IE_32;
1435 }
1436
1437 /* We checked the transition before when we were called from
1438 elf_i386_check_relocs. We only want to check the new
1439 transition which hasn't been checked before. */
1440 check = new_to_type != to_type && from_type == to_type;
1441 to_type = new_to_type;
1442 }
1443
1444 break;
1445
1446 case R_386_TLS_LDM:
1447 if (bfd_link_executable (info))
1448 to_type = R_386_TLS_LE_32;
1449 break;
1450
1451 default:
1452 return TRUE;
1453 }
1454
1455 /* Return TRUE if there is no transition. */
1456 if (from_type == to_type)
1457 return TRUE;
1458
1459 /* Check if the transition can be performed. */
1460 if (check
1461 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1462 symtab_hdr, sym_hashes,
1463 from_type, rel, relend))
1464 {
1465 reloc_howto_type *from, *to;
1466 const char *name;
1467
1468 from = elf_i386_rtype_to_howto (abfd, from_type);
1469 to = elf_i386_rtype_to_howto (abfd, to_type);
1470
1471 if (h)
1472 name = h->root.root.string;
1473 else
1474 {
1475 struct elf_i386_link_hash_table *htab;
1476
1477 htab = elf_i386_hash_table (info);
1478 if (htab == NULL)
1479 name = "*unknown*";
1480 else
1481 {
1482 Elf_Internal_Sym *isym;
1483
1484 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1485 abfd, r_symndx);
1486 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1487 }
1488 }
1489
1490 (*_bfd_error_handler)
1491 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1492 "in section `%A' failed"),
1493 abfd, sec, from->name, to->name, name,
1494 (unsigned long) rel->r_offset);
1495 bfd_set_error (bfd_error_bad_value);
1496 return FALSE;
1497 }
1498
1499 *r_type = to_type;
1500 return TRUE;
1501 }
1502
1503 /* Rename some of the generic section flags to better document how they
1504 are used here. */
1505 #define need_convert_load sec_flg0
1506
1507 /* Look through the relocs for a section during the first phase, and
1508 calculate needed space in the global offset table, procedure linkage
1509 table, and dynamic reloc sections. */
1510
1511 static bfd_boolean
1512 elf_i386_check_relocs (bfd *abfd,
1513 struct bfd_link_info *info,
1514 asection *sec,
1515 const Elf_Internal_Rela *relocs)
1516 {
1517 struct elf_i386_link_hash_table *htab;
1518 Elf_Internal_Shdr *symtab_hdr;
1519 struct elf_link_hash_entry **sym_hashes;
1520 const Elf_Internal_Rela *rel;
1521 const Elf_Internal_Rela *rel_end;
1522 asection *sreloc;
1523 bfd_boolean use_plt_got;
1524
1525 if (bfd_link_relocatable (info))
1526 return TRUE;
1527
1528 BFD_ASSERT (is_i386_elf (abfd));
1529
1530 htab = elf_i386_hash_table (info);
1531 if (htab == NULL)
1532 return FALSE;
1533
1534 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1535 && (get_elf_i386_backend_data (abfd)
1536 == &elf_i386_arch_bed));
1537
1538 symtab_hdr = &elf_symtab_hdr (abfd);
1539 sym_hashes = elf_sym_hashes (abfd);
1540
1541 sreloc = NULL;
1542
1543 rel_end = relocs + sec->reloc_count;
1544 for (rel = relocs; rel < rel_end; rel++)
1545 {
1546 unsigned int r_type;
1547 unsigned long r_symndx;
1548 struct elf_link_hash_entry *h;
1549 struct elf_i386_link_hash_entry *eh;
1550 Elf_Internal_Sym *isym;
1551 const char *name;
1552 bfd_boolean size_reloc;
1553
1554 r_symndx = ELF32_R_SYM (rel->r_info);
1555 r_type = ELF32_R_TYPE (rel->r_info);
1556
1557 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1558 {
1559 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1560 abfd,
1561 r_symndx);
1562 return FALSE;
1563 }
1564
1565 if (r_symndx < symtab_hdr->sh_info)
1566 {
1567 /* A local symbol. */
1568 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1569 abfd, r_symndx);
1570 if (isym == NULL)
1571 return FALSE;
1572
1573 /* Check relocation against local STT_GNU_IFUNC symbol. */
1574 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1575 {
1576 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1577 if (h == NULL)
1578 return FALSE;
1579
1580 /* Fake a STT_GNU_IFUNC symbol. */
1581 h->type = STT_GNU_IFUNC;
1582 h->def_regular = 1;
1583 h->ref_regular = 1;
1584 h->forced_local = 1;
1585 h->root.type = bfd_link_hash_defined;
1586 }
1587 else
1588 h = NULL;
1589 }
1590 else
1591 {
1592 isym = NULL;
1593 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1594 while (h->root.type == bfd_link_hash_indirect
1595 || h->root.type == bfd_link_hash_warning)
1596 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1597 }
1598
1599 eh = (struct elf_i386_link_hash_entry *) h;
1600 if (h != NULL)
1601 {
1602 /* Create the ifunc sections for static executables. If we
1603 never see an indirect function symbol nor we are building
1604 a static executable, those sections will be empty and
1605 won't appear in output. */
1606 switch (r_type)
1607 {
1608 default:
1609 break;
1610
1611 case R_386_GOTOFF:
1612 eh->gotoff_ref = 1;
1613 case R_386_32:
1614 case R_386_PC32:
1615 case R_386_PLT32:
1616 case R_386_GOT32:
1617 case R_386_GOT32X:
1618 if (htab->elf.dynobj == NULL)
1619 htab->elf.dynobj = abfd;
1620 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1621 return FALSE;
1622 break;
1623 }
1624
1625 /* It is referenced by a non-shared object. */
1626 h->ref_regular = 1;
1627 h->root.non_ir_ref = 1;
1628
1629 if (h->type == STT_GNU_IFUNC)
1630 elf_tdata (info->output_bfd)->has_gnu_symbols
1631 |= elf_gnu_symbol_ifunc;
1632 }
1633
1634 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1635 symtab_hdr, sym_hashes,
1636 &r_type, GOT_UNKNOWN,
1637 rel, rel_end, h, r_symndx))
1638 return FALSE;
1639
1640 switch (r_type)
1641 {
1642 case R_386_TLS_LDM:
1643 htab->tls_ldm_got.refcount += 1;
1644 goto create_got;
1645
1646 case R_386_PLT32:
1647 /* This symbol requires a procedure linkage table entry. We
1648 actually build the entry in adjust_dynamic_symbol,
1649 because this might be a case of linking PIC code which is
1650 never referenced by a dynamic object, in which case we
1651 don't need to generate a procedure linkage table entry
1652 after all. */
1653
1654 /* If this is a local symbol, we resolve it directly without
1655 creating a procedure linkage table entry. */
1656 if (h == NULL)
1657 continue;
1658
1659 eh->has_got_reloc = 1;
1660 h->needs_plt = 1;
1661 h->plt.refcount += 1;
1662 break;
1663
1664 case R_386_SIZE32:
1665 size_reloc = TRUE;
1666 goto do_size;
1667
1668 case R_386_TLS_IE_32:
1669 case R_386_TLS_IE:
1670 case R_386_TLS_GOTIE:
1671 if (!bfd_link_executable (info))
1672 info->flags |= DF_STATIC_TLS;
1673 /* Fall through */
1674
1675 case R_386_GOT32:
1676 case R_386_GOT32X:
1677 case R_386_TLS_GD:
1678 case R_386_TLS_GOTDESC:
1679 case R_386_TLS_DESC_CALL:
1680 /* This symbol requires a global offset table entry. */
1681 {
1682 int tls_type, old_tls_type;
1683
1684 switch (r_type)
1685 {
1686 default:
1687 case R_386_GOT32:
1688 case R_386_GOT32X:
1689 tls_type = GOT_NORMAL;
1690 break;
1691 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1692 case R_386_TLS_GOTDESC:
1693 case R_386_TLS_DESC_CALL:
1694 tls_type = GOT_TLS_GDESC; break;
1695 case R_386_TLS_IE_32:
1696 if (ELF32_R_TYPE (rel->r_info) == r_type)
1697 tls_type = GOT_TLS_IE_NEG;
1698 else
1699 /* If this is a GD->IE transition, we may use either of
1700 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1701 tls_type = GOT_TLS_IE;
1702 break;
1703 case R_386_TLS_IE:
1704 case R_386_TLS_GOTIE:
1705 tls_type = GOT_TLS_IE_POS; break;
1706 }
1707
1708 if (h != NULL)
1709 {
1710 h->got.refcount += 1;
1711 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1712 }
1713 else
1714 {
1715 bfd_signed_vma *local_got_refcounts;
1716
1717 /* This is a global offset table entry for a local symbol. */
1718 local_got_refcounts = elf_local_got_refcounts (abfd);
1719 if (local_got_refcounts == NULL)
1720 {
1721 bfd_size_type size;
1722
1723 size = symtab_hdr->sh_info;
1724 size *= (sizeof (bfd_signed_vma)
1725 + sizeof (bfd_vma) + sizeof(char));
1726 local_got_refcounts = (bfd_signed_vma *)
1727 bfd_zalloc (abfd, size);
1728 if (local_got_refcounts == NULL)
1729 return FALSE;
1730 elf_local_got_refcounts (abfd) = local_got_refcounts;
1731 elf_i386_local_tlsdesc_gotent (abfd)
1732 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1733 elf_i386_local_got_tls_type (abfd)
1734 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1735 }
1736 local_got_refcounts[r_symndx] += 1;
1737 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1738 }
1739
1740 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1741 tls_type |= old_tls_type;
1742 /* If a TLS symbol is accessed using IE at least once,
1743 there is no point to use dynamic model for it. */
1744 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1745 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1746 || (tls_type & GOT_TLS_IE) == 0))
1747 {
1748 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1749 tls_type = old_tls_type;
1750 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1751 && GOT_TLS_GD_ANY_P (tls_type))
1752 tls_type |= old_tls_type;
1753 else
1754 {
1755 if (h)
1756 name = h->root.root.string;
1757 else
1758 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1759 NULL);
1760 (*_bfd_error_handler)
1761 (_("%B: `%s' accessed both as normal and "
1762 "thread local symbol"),
1763 abfd, name);
1764 bfd_set_error (bfd_error_bad_value);
1765 return FALSE;
1766 }
1767 }
1768
1769 if (old_tls_type != tls_type)
1770 {
1771 if (h != NULL)
1772 elf_i386_hash_entry (h)->tls_type = tls_type;
1773 else
1774 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1775 }
1776 }
1777 /* Fall through */
1778
1779 case R_386_GOTOFF:
1780 case R_386_GOTPC:
1781 create_got:
1782 if (htab->elf.sgot == NULL)
1783 {
1784 if (htab->elf.dynobj == NULL)
1785 htab->elf.dynobj = abfd;
1786 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1787 return FALSE;
1788 }
1789 if (r_type != R_386_TLS_IE)
1790 {
1791 if (eh != NULL)
1792 eh->has_got_reloc = 1;
1793 break;
1794 }
1795 /* Fall through */
1796
1797 case R_386_TLS_LE_32:
1798 case R_386_TLS_LE:
1799 if (eh != NULL)
1800 eh->has_got_reloc = 1;
1801 if (bfd_link_executable (info))
1802 break;
1803 info->flags |= DF_STATIC_TLS;
1804 goto do_relocation;
1805
1806 case R_386_32:
1807 case R_386_PC32:
1808 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1809 eh->has_non_got_reloc = 1;
1810 do_relocation:
1811 /* STT_GNU_IFUNC symbol must go through PLT even if it is
1812 locally defined and undefined symbol may turn out to be
1813 a STT_GNU_IFUNC symbol later. */
1814 if (h != NULL
1815 && (bfd_link_executable (info)
1816 || ((h->type == STT_GNU_IFUNC
1817 || h->root.type == bfd_link_hash_undefweak
1818 || h->root.type == bfd_link_hash_undefined)
1819 && SYMBOLIC_BIND (info, h))))
1820 {
1821 /* If this reloc is in a read-only section, we might
1822 need a copy reloc. We can't check reliably at this
1823 stage whether the section is read-only, as input
1824 sections have not yet been mapped to output sections.
1825 Tentatively set the flag for now, and correct in
1826 adjust_dynamic_symbol. */
1827 h->non_got_ref = 1;
1828
1829 /* We may need a .plt entry if the function this reloc
1830 refers to is in a shared lib. */
1831 h->plt.refcount += 1;
1832 if (r_type == R_386_PC32)
1833 {
1834 /* Since something like ".long foo - ." may be used
1835 as pointer, make sure that PLT is used if foo is
1836 a function defined in a shared library. */
1837 if ((sec->flags & SEC_CODE) == 0)
1838 h->pointer_equality_needed = 1;
1839 }
1840 else
1841 {
1842 h->pointer_equality_needed = 1;
1843 /* R_386_32 can be resolved at run-time. */
1844 if (r_type == R_386_32
1845 && (sec->flags & SEC_READONLY) == 0)
1846 eh->func_pointer_refcount += 1;
1847 }
1848 }
1849
1850 size_reloc = FALSE;
1851 do_size:
1852 /* If we are creating a shared library, and this is a reloc
1853 against a global symbol, or a non PC relative reloc
1854 against a local symbol, then we need to copy the reloc
1855 into the shared library. However, if we are linking with
1856 -Bsymbolic, we do not need to copy a reloc against a
1857 global symbol which is defined in an object we are
1858 including in the link (i.e., DEF_REGULAR is set). At
1859 this point we have not seen all the input files, so it is
1860 possible that DEF_REGULAR is not set now but will be set
1861 later (it is never cleared). In case of a weak definition,
1862 DEF_REGULAR may be cleared later by a strong definition in
1863 a shared library. We account for that possibility below by
1864 storing information in the relocs_copied field of the hash
1865 table entry. A similar situation occurs when creating
1866 shared libraries and symbol visibility changes render the
1867 symbol local.
1868
1869 If on the other hand, we are creating an executable, we
1870 may need to keep relocations for symbols satisfied by a
1871 dynamic library if we manage to avoid copy relocs for the
1872 symbol. */
1873 if ((bfd_link_pic (info)
1874 && (sec->flags & SEC_ALLOC) != 0
1875 && (r_type != R_386_PC32
1876 || (h != NULL
1877 && (! (bfd_link_pie (info)
1878 || SYMBOLIC_BIND (info, h))
1879 || h->root.type == bfd_link_hash_defweak
1880 || !h->def_regular))))
1881 || (ELIMINATE_COPY_RELOCS
1882 && !bfd_link_pic (info)
1883 && (sec->flags & SEC_ALLOC) != 0
1884 && h != NULL
1885 && (h->root.type == bfd_link_hash_defweak
1886 || !h->def_regular)))
1887 {
1888 struct elf_dyn_relocs *p;
1889 struct elf_dyn_relocs **head;
1890
1891 /* We must copy these reloc types into the output file.
1892 Create a reloc section in dynobj and make room for
1893 this reloc. */
1894 if (sreloc == NULL)
1895 {
1896 if (htab->elf.dynobj == NULL)
1897 htab->elf.dynobj = abfd;
1898
1899 sreloc = _bfd_elf_make_dynamic_reloc_section
1900 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1901
1902 if (sreloc == NULL)
1903 return FALSE;
1904 }
1905
1906 /* If this is a global symbol, we count the number of
1907 relocations we need for this symbol. */
1908 if (h != NULL)
1909 {
1910 head = &eh->dyn_relocs;
1911 }
1912 else
1913 {
1914 /* Track dynamic relocs needed for local syms too.
1915 We really need local syms available to do this
1916 easily. Oh well. */
1917 void **vpp;
1918 asection *s;
1919
1920 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1921 abfd, r_symndx);
1922 if (isym == NULL)
1923 return FALSE;
1924
1925 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1926 if (s == NULL)
1927 s = sec;
1928
1929 vpp = &elf_section_data (s)->local_dynrel;
1930 head = (struct elf_dyn_relocs **)vpp;
1931 }
1932
1933 p = *head;
1934 if (p == NULL || p->sec != sec)
1935 {
1936 bfd_size_type amt = sizeof *p;
1937 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1938 amt);
1939 if (p == NULL)
1940 return FALSE;
1941 p->next = *head;
1942 *head = p;
1943 p->sec = sec;
1944 p->count = 0;
1945 p->pc_count = 0;
1946 }
1947
1948 p->count += 1;
1949 /* Count size relocation as PC-relative relocation. */
1950 if (r_type == R_386_PC32 || size_reloc)
1951 p->pc_count += 1;
1952 }
1953 break;
1954
1955 /* This relocation describes the C++ object vtable hierarchy.
1956 Reconstruct it for later use during GC. */
1957 case R_386_GNU_VTINHERIT:
1958 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1959 return FALSE;
1960 break;
1961
1962 /* This relocation describes which C++ vtable entries are actually
1963 used. Record for later use during GC. */
1964 case R_386_GNU_VTENTRY:
1965 BFD_ASSERT (h != NULL);
1966 if (h != NULL
1967 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1968 return FALSE;
1969 break;
1970
1971 default:
1972 break;
1973 }
1974
1975 if (use_plt_got
1976 && h != NULL
1977 && h->plt.refcount > 0
1978 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1979 || h->got.refcount > 0)
1980 && htab->plt_got == NULL)
1981 {
1982 /* Create the GOT procedure linkage table. */
1983 unsigned int plt_got_align;
1984 const struct elf_backend_data *bed;
1985
1986 bed = get_elf_backend_data (info->output_bfd);
1987 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1988 && (sizeof (elf_i386_got_plt_entry)
1989 == sizeof (elf_i386_pic_got_plt_entry)));
1990 plt_got_align = 3;
1991
1992 if (htab->elf.dynobj == NULL)
1993 htab->elf.dynobj = abfd;
1994 htab->plt_got
1995 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1996 ".plt.got",
1997 (bed->dynamic_sec_flags
1998 | SEC_ALLOC
1999 | SEC_CODE
2000 | SEC_LOAD
2001 | SEC_READONLY));
2002 if (htab->plt_got == NULL
2003 || !bfd_set_section_alignment (htab->elf.dynobj,
2004 htab->plt_got,
2005 plt_got_align))
2006 return FALSE;
2007 }
2008
2009 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
2010 && (h == NULL || h->type != STT_GNU_IFUNC))
2011 sec->need_convert_load = 1;
2012 }
2013
2014 return TRUE;
2015 }
2016
2017 /* Return the section that should be marked against GC for a given
2018 relocation. */
2019
2020 static asection *
2021 elf_i386_gc_mark_hook (asection *sec,
2022 struct bfd_link_info *info,
2023 Elf_Internal_Rela *rel,
2024 struct elf_link_hash_entry *h,
2025 Elf_Internal_Sym *sym)
2026 {
2027 if (h != NULL)
2028 switch (ELF32_R_TYPE (rel->r_info))
2029 {
2030 case R_386_GNU_VTINHERIT:
2031 case R_386_GNU_VTENTRY:
2032 return NULL;
2033 }
2034
2035 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2036 }
2037
2038 /* Update the got entry reference counts for the section being removed. */
2039
2040 static bfd_boolean
2041 elf_i386_gc_sweep_hook (bfd *abfd,
2042 struct bfd_link_info *info,
2043 asection *sec,
2044 const Elf_Internal_Rela *relocs)
2045 {
2046 struct elf_i386_link_hash_table *htab;
2047 Elf_Internal_Shdr *symtab_hdr;
2048 struct elf_link_hash_entry **sym_hashes;
2049 bfd_signed_vma *local_got_refcounts;
2050 const Elf_Internal_Rela *rel, *relend;
2051
2052 if (bfd_link_relocatable (info))
2053 return TRUE;
2054
2055 htab = elf_i386_hash_table (info);
2056 if (htab == NULL)
2057 return FALSE;
2058
2059 elf_section_data (sec)->local_dynrel = NULL;
2060
2061 symtab_hdr = &elf_symtab_hdr (abfd);
2062 sym_hashes = elf_sym_hashes (abfd);
2063 local_got_refcounts = elf_local_got_refcounts (abfd);
2064
2065 relend = relocs + sec->reloc_count;
2066 for (rel = relocs; rel < relend; rel++)
2067 {
2068 unsigned long r_symndx;
2069 unsigned int r_type;
2070 struct elf_link_hash_entry *h = NULL;
2071
2072 r_symndx = ELF32_R_SYM (rel->r_info);
2073 if (r_symndx >= symtab_hdr->sh_info)
2074 {
2075 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2076 while (h->root.type == bfd_link_hash_indirect
2077 || h->root.type == bfd_link_hash_warning)
2078 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2079 }
2080 else
2081 {
2082 /* A local symbol. */
2083 Elf_Internal_Sym *isym;
2084
2085 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2086 abfd, r_symndx);
2087
2088 /* Check relocation against local STT_GNU_IFUNC symbol. */
2089 if (isym != NULL
2090 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2091 {
2092 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2093 if (h == NULL)
2094 abort ();
2095 }
2096 }
2097
2098 if (h)
2099 {
2100 struct elf_i386_link_hash_entry *eh;
2101 struct elf_dyn_relocs **pp;
2102 struct elf_dyn_relocs *p;
2103
2104 eh = (struct elf_i386_link_hash_entry *) h;
2105 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2106 if (p->sec == sec)
2107 {
2108 /* Everything must go for SEC. */
2109 *pp = p->next;
2110 break;
2111 }
2112 }
2113
2114 r_type = ELF32_R_TYPE (rel->r_info);
2115 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2116 symtab_hdr, sym_hashes,
2117 &r_type, GOT_UNKNOWN,
2118 rel, relend, h, r_symndx))
2119 return FALSE;
2120
2121 switch (r_type)
2122 {
2123 case R_386_TLS_LDM:
2124 if (htab->tls_ldm_got.refcount > 0)
2125 htab->tls_ldm_got.refcount -= 1;
2126 break;
2127
2128 case R_386_TLS_GD:
2129 case R_386_TLS_GOTDESC:
2130 case R_386_TLS_DESC_CALL:
2131 case R_386_TLS_IE_32:
2132 case R_386_TLS_IE:
2133 case R_386_TLS_GOTIE:
2134 case R_386_GOT32:
2135 case R_386_GOT32X:
2136 if (h != NULL)
2137 {
2138 if (h->got.refcount > 0)
2139 h->got.refcount -= 1;
2140 if (h->type == STT_GNU_IFUNC)
2141 {
2142 if (h->plt.refcount > 0)
2143 h->plt.refcount -= 1;
2144 }
2145 }
2146 else if (local_got_refcounts != NULL)
2147 {
2148 if (local_got_refcounts[r_symndx] > 0)
2149 local_got_refcounts[r_symndx] -= 1;
2150 }
2151 break;
2152
2153 case R_386_32:
2154 case R_386_PC32:
2155 case R_386_SIZE32:
2156 if (bfd_link_pic (info)
2157 && (h == NULL || h->type != STT_GNU_IFUNC))
2158 break;
2159 /* Fall through */
2160
2161 case R_386_PLT32:
2162 if (h != NULL)
2163 {
2164 if (h->plt.refcount > 0)
2165 h->plt.refcount -= 1;
2166 if (r_type == R_386_32
2167 && (sec->flags & SEC_READONLY) == 0)
2168 {
2169 struct elf_i386_link_hash_entry *eh
2170 = (struct elf_i386_link_hash_entry *) h;
2171 if (eh->func_pointer_refcount > 0)
2172 eh->func_pointer_refcount -= 1;
2173 }
2174 }
2175 break;
2176
2177 case R_386_GOTOFF:
2178 if (h != NULL && h->type == STT_GNU_IFUNC)
2179 {
2180 if (h->got.refcount > 0)
2181 h->got.refcount -= 1;
2182 if (h->plt.refcount > 0)
2183 h->plt.refcount -= 1;
2184 }
2185 break;
2186
2187 default:
2188 break;
2189 }
2190 }
2191
2192 return TRUE;
2193 }
2194
2195 /* Remove undefined weak symbol from the dynamic symbol table if it
2196 is resolved to 0. */
2197
2198 static bfd_boolean
2199 elf_i386_fixup_symbol (struct bfd_link_info *info,
2200 struct elf_link_hash_entry *h)
2201 {
2202 if (h->dynindx != -1
2203 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2204 elf_i386_hash_entry (h)))
2205 {
2206 h->dynindx = -1;
2207 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2208 h->dynstr_index);
2209 }
2210 return TRUE;
2211 }
2212
2213 /* Adjust a symbol defined by a dynamic object and referenced by a
2214 regular object. The current definition is in some section of the
2215 dynamic object, but we're not including those sections. We have to
2216 change the definition to something the rest of the link can
2217 understand. */
2218
2219 static bfd_boolean
2220 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2221 struct elf_link_hash_entry *h)
2222 {
2223 struct elf_i386_link_hash_table *htab;
2224 asection *s;
2225 struct elf_i386_link_hash_entry *eh;
2226 struct elf_dyn_relocs *p;
2227
2228 /* STT_GNU_IFUNC symbol must go through PLT. */
2229 if (h->type == STT_GNU_IFUNC)
2230 {
2231 /* All local STT_GNU_IFUNC references must be treate as local
2232 calls via local PLT. */
2233 if (h->ref_regular
2234 && SYMBOL_CALLS_LOCAL (info, h))
2235 {
2236 bfd_size_type pc_count = 0, count = 0;
2237 struct elf_dyn_relocs **pp;
2238
2239 eh = (struct elf_i386_link_hash_entry *) h;
2240 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2241 {
2242 pc_count += p->pc_count;
2243 p->count -= p->pc_count;
2244 p->pc_count = 0;
2245 count += p->count;
2246 if (p->count == 0)
2247 *pp = p->next;
2248 else
2249 pp = &p->next;
2250 }
2251
2252 if (pc_count || count)
2253 {
2254 h->needs_plt = 1;
2255 h->non_got_ref = 1;
2256 if (h->plt.refcount <= 0)
2257 h->plt.refcount = 1;
2258 else
2259 h->plt.refcount += 1;
2260 }
2261 }
2262
2263 if (h->plt.refcount <= 0)
2264 {
2265 h->plt.offset = (bfd_vma) -1;
2266 h->needs_plt = 0;
2267 }
2268 return TRUE;
2269 }
2270
2271 /* If this is a function, put it in the procedure linkage table. We
2272 will fill in the contents of the procedure linkage table later,
2273 when we know the address of the .got section. */
2274 if (h->type == STT_FUNC
2275 || h->needs_plt)
2276 {
2277 if (h->plt.refcount <= 0
2278 || SYMBOL_CALLS_LOCAL (info, h)
2279 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2280 && h->root.type == bfd_link_hash_undefweak))
2281 {
2282 /* This case can occur if we saw a PLT32 reloc in an input
2283 file, but the symbol was never referred to by a dynamic
2284 object, or if all references were garbage collected. In
2285 such a case, we don't actually need to build a procedure
2286 linkage table, and we can just do a PC32 reloc instead. */
2287 h->plt.offset = (bfd_vma) -1;
2288 h->needs_plt = 0;
2289 }
2290
2291 return TRUE;
2292 }
2293 else
2294 /* It's possible that we incorrectly decided a .plt reloc was
2295 needed for an R_386_PC32 reloc to a non-function sym in
2296 check_relocs. We can't decide accurately between function and
2297 non-function syms in check-relocs; Objects loaded later in
2298 the link may change h->type. So fix it now. */
2299 h->plt.offset = (bfd_vma) -1;
2300
2301 /* If this is a weak symbol, and there is a real definition, the
2302 processor independent code will have arranged for us to see the
2303 real definition first, and we can just use the same value. */
2304 if (h->u.weakdef != NULL)
2305 {
2306 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2307 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2308 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2309 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2310 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2311 h->non_got_ref = h->u.weakdef->non_got_ref;
2312 return TRUE;
2313 }
2314
2315 /* This is a reference to a symbol defined by a dynamic object which
2316 is not a function. */
2317
2318 /* If we are creating a shared library, we must presume that the
2319 only references to the symbol are via the global offset table.
2320 For such cases we need not do anything here; the relocations will
2321 be handled correctly by relocate_section. */
2322 if (!bfd_link_executable (info))
2323 return TRUE;
2324
2325 /* If there are no references to this symbol that do not use the
2326 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2327 reloc. */
2328 eh = (struct elf_i386_link_hash_entry *) h;
2329 if (!h->non_got_ref && !eh->gotoff_ref)
2330 return TRUE;
2331
2332 /* If -z nocopyreloc was given, we won't generate them either. */
2333 if (info->nocopyreloc)
2334 {
2335 h->non_got_ref = 0;
2336 return TRUE;
2337 }
2338
2339 htab = elf_i386_hash_table (info);
2340 if (htab == NULL)
2341 return FALSE;
2342
2343 /* If there aren't any dynamic relocs in read-only sections nor
2344 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2345 avoid the copy reloc. This doesn't work on VxWorks, where we can
2346 not have dynamic relocations (other than copy and jump slot
2347 relocations) in an executable. */
2348 if (ELIMINATE_COPY_RELOCS
2349 && !eh->gotoff_ref
2350 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2351 {
2352 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2353 {
2354 s = p->sec->output_section;
2355 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2356 break;
2357 }
2358
2359 if (p == NULL)
2360 {
2361 h->non_got_ref = 0;
2362 return TRUE;
2363 }
2364 }
2365
2366 /* We must allocate the symbol in our .dynbss section, which will
2367 become part of the .bss section of the executable. There will be
2368 an entry for this symbol in the .dynsym section. The dynamic
2369 object will contain position independent code, so all references
2370 from the dynamic object to this symbol will go through the global
2371 offset table. The dynamic linker will use the .dynsym entry to
2372 determine the address it must put in the global offset table, so
2373 both the dynamic object and the regular object will refer to the
2374 same memory location for the variable. */
2375
2376 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2377 copy the initial value out of the dynamic object and into the
2378 runtime process image. */
2379 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2380 {
2381 htab->srelbss->size += sizeof (Elf32_External_Rel);
2382 h->needs_copy = 1;
2383 }
2384
2385 s = htab->sdynbss;
2386
2387 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2388 }
2389
2390 /* Allocate space in .plt, .got and associated reloc sections for
2391 dynamic relocs. */
2392
2393 static bfd_boolean
2394 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2395 {
2396 struct bfd_link_info *info;
2397 struct elf_i386_link_hash_table *htab;
2398 struct elf_i386_link_hash_entry *eh;
2399 struct elf_dyn_relocs *p;
2400 unsigned plt_entry_size;
2401 bfd_boolean resolved_to_zero;
2402
2403 if (h->root.type == bfd_link_hash_indirect)
2404 return TRUE;
2405
2406 eh = (struct elf_i386_link_hash_entry *) h;
2407
2408 info = (struct bfd_link_info *) inf;
2409 htab = elf_i386_hash_table (info);
2410 if (htab == NULL)
2411 return FALSE;
2412
2413 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2414
2415 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
2416
2417 /* Clear the reference count of function pointer relocations if
2418 symbol isn't a normal function. */
2419 if (h->type != STT_FUNC)
2420 eh->func_pointer_refcount = 0;
2421
2422 /* We can't use the GOT PLT if pointer equality is needed since
2423 finish_dynamic_symbol won't clear symbol value and the dynamic
2424 linker won't update the GOT slot. We will get into an infinite
2425 loop at run-time. */
2426 if (htab->plt_got != NULL
2427 && h->type != STT_GNU_IFUNC
2428 && !h->pointer_equality_needed
2429 && h->plt.refcount > 0
2430 && h->got.refcount > 0)
2431 {
2432 /* Don't use the regular PLT if there are both GOT and GOTPLT
2433 reloctions. */
2434 h->plt.offset = (bfd_vma) -1;
2435
2436 /* Use the GOT PLT. */
2437 eh->plt_got.refcount = 1;
2438 }
2439
2440 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2441 here if it is defined and referenced in a non-shared object. */
2442 if (h->type == STT_GNU_IFUNC
2443 && h->def_regular)
2444 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2445 plt_entry_size,
2446 plt_entry_size, 4);
2447 /* Don't create the PLT entry if there are only function pointer
2448 relocations which can be resolved at run-time. */
2449 else if (htab->elf.dynamic_sections_created
2450 && (h->plt.refcount > eh->func_pointer_refcount
2451 || eh->plt_got.refcount > 0))
2452 {
2453 bfd_boolean use_plt_got;
2454
2455 /* Clear the reference count of function pointer relocations
2456 if PLT is used. */
2457 eh->func_pointer_refcount = 0;
2458
2459 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2460 {
2461 /* Don't use the regular PLT for DF_BIND_NOW. */
2462 h->plt.offset = (bfd_vma) -1;
2463
2464 /* Use the GOT PLT. */
2465 h->got.refcount = 1;
2466 eh->plt_got.refcount = 1;
2467 }
2468
2469 use_plt_got = eh->plt_got.refcount > 0;
2470
2471 /* Make sure this symbol is output as a dynamic symbol.
2472 Undefined weak syms won't yet be marked as dynamic. */
2473 if (h->dynindx == -1
2474 && !h->forced_local
2475 && !resolved_to_zero)
2476 {
2477 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2478 return FALSE;
2479 }
2480
2481 if (bfd_link_pic (info)
2482 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2483 {
2484 asection *s = htab->elf.splt;
2485 asection *got_s = htab->plt_got;
2486
2487 /* If this is the first .plt entry, make room for the special
2488 first entry. The .plt section is used by prelink to undo
2489 prelinking for dynamic relocations. */
2490 if (s->size == 0)
2491 s->size = plt_entry_size;
2492
2493 if (use_plt_got)
2494 eh->plt_got.offset = got_s->size;
2495 else
2496 h->plt.offset = s->size;
2497
2498 /* If this symbol is not defined in a regular file, and we are
2499 not generating a shared library, then set the symbol to this
2500 location in the .plt. This is required to make function
2501 pointers compare as equal between the normal executable and
2502 the shared library. */
2503 if (! bfd_link_pic (info)
2504 && !h->def_regular)
2505 {
2506 if (use_plt_got)
2507 {
2508 /* We need to make a call to the entry of the GOT PLT
2509 instead of regular PLT entry. */
2510 h->root.u.def.section = got_s;
2511 h->root.u.def.value = eh->plt_got.offset;
2512 }
2513 else
2514 {
2515 h->root.u.def.section = s;
2516 h->root.u.def.value = h->plt.offset;
2517 }
2518 }
2519
2520 /* Make room for this entry. */
2521 if (use_plt_got)
2522 got_s->size += sizeof (elf_i386_got_plt_entry);
2523 else
2524 {
2525 s->size += plt_entry_size;
2526
2527 /* We also need to make an entry in the .got.plt section,
2528 which will be placed in the .got section by the linker
2529 script. */
2530 htab->elf.sgotplt->size += 4;
2531
2532 /* There should be no PLT relocation against resolved
2533 undefined weak symbol in executable. */
2534 if (!resolved_to_zero)
2535 {
2536 /* We also need to make an entry in the .rel.plt
2537 section. */
2538 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2539 htab->elf.srelplt->reloc_count++;
2540 }
2541 }
2542
2543 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2544 && !bfd_link_pic (info))
2545 {
2546 /* VxWorks has a second set of relocations for each PLT entry
2547 in executables. They go in a separate relocation section,
2548 which is processed by the kernel loader. */
2549
2550 /* There are two relocations for the initial PLT entry: an
2551 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2552 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2553
2554 if (h->plt.offset == plt_entry_size)
2555 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2556
2557 /* There are two extra relocations for each subsequent PLT entry:
2558 an R_386_32 relocation for the GOT entry, and an R_386_32
2559 relocation for the PLT entry. */
2560
2561 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2562 }
2563 }
2564 else
2565 {
2566 eh->plt_got.offset = (bfd_vma) -1;
2567 h->plt.offset = (bfd_vma) -1;
2568 h->needs_plt = 0;
2569 }
2570 }
2571 else
2572 {
2573 eh->plt_got.offset = (bfd_vma) -1;
2574 h->plt.offset = (bfd_vma) -1;
2575 h->needs_plt = 0;
2576 }
2577
2578 eh->tlsdesc_got = (bfd_vma) -1;
2579
2580 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2581 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2582 if (h->got.refcount > 0
2583 && bfd_link_executable (info)
2584 && h->dynindx == -1
2585 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2586 h->got.offset = (bfd_vma) -1;
2587 else if (h->got.refcount > 0)
2588 {
2589 asection *s;
2590 bfd_boolean dyn;
2591 int tls_type = elf_i386_hash_entry(h)->tls_type;
2592
2593 /* Make sure this symbol is output as a dynamic symbol.
2594 Undefined weak syms won't yet be marked as dynamic. */
2595 if (h->dynindx == -1
2596 && !h->forced_local
2597 && !resolved_to_zero)
2598 {
2599 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2600 return FALSE;
2601 }
2602
2603 s = htab->elf.sgot;
2604 if (GOT_TLS_GDESC_P (tls_type))
2605 {
2606 eh->tlsdesc_got = htab->elf.sgotplt->size
2607 - elf_i386_compute_jump_table_size (htab);
2608 htab->elf.sgotplt->size += 8;
2609 h->got.offset = (bfd_vma) -2;
2610 }
2611 if (! GOT_TLS_GDESC_P (tls_type)
2612 || GOT_TLS_GD_P (tls_type))
2613 {
2614 h->got.offset = s->size;
2615 s->size += 4;
2616 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2617 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2618 s->size += 4;
2619 }
2620 dyn = htab->elf.dynamic_sections_created;
2621 /* R_386_TLS_IE_32 needs one dynamic relocation,
2622 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2623 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2624 need two), R_386_TLS_GD needs one if local symbol and two if
2625 global. No dynamic relocation against resolved undefined weak
2626 symbol in executable. */
2627 if (tls_type == GOT_TLS_IE_BOTH)
2628 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2629 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2630 || (tls_type & GOT_TLS_IE))
2631 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2632 else if (GOT_TLS_GD_P (tls_type))
2633 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2634 else if (! GOT_TLS_GDESC_P (tls_type)
2635 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2636 && !resolved_to_zero)
2637 || h->root.type != bfd_link_hash_undefweak)
2638 && (bfd_link_pic (info)
2639 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2640 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2641 if (GOT_TLS_GDESC_P (tls_type))
2642 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2643 }
2644 else
2645 h->got.offset = (bfd_vma) -1;
2646
2647 if (eh->dyn_relocs == NULL)
2648 return TRUE;
2649
2650 /* In the shared -Bsymbolic case, discard space allocated for
2651 dynamic pc-relative relocs against symbols which turn out to be
2652 defined in regular objects. For the normal shared case, discard
2653 space for pc-relative relocs that have become local due to symbol
2654 visibility changes. */
2655
2656 if (bfd_link_pic (info))
2657 {
2658 /* The only reloc that uses pc_count is R_386_PC32, which will
2659 appear on a call or on something like ".long foo - .". We
2660 want calls to protected symbols to resolve directly to the
2661 function rather than going via the plt. If people want
2662 function pointer comparisons to work as expected then they
2663 should avoid writing assembly like ".long foo - .". */
2664 if (SYMBOL_CALLS_LOCAL (info, h))
2665 {
2666 struct elf_dyn_relocs **pp;
2667
2668 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2669 {
2670 p->count -= p->pc_count;
2671 p->pc_count = 0;
2672 if (p->count == 0)
2673 *pp = p->next;
2674 else
2675 pp = &p->next;
2676 }
2677 }
2678
2679 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2680 {
2681 struct elf_dyn_relocs **pp;
2682 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2683 {
2684 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2685 *pp = p->next;
2686 else
2687 pp = &p->next;
2688 }
2689 }
2690
2691 /* Also discard relocs on undefined weak syms with non-default
2692 visibility or in PIE. */
2693 if (eh->dyn_relocs != NULL
2694 && h->root.type == bfd_link_hash_undefweak)
2695 {
2696 /* Undefined weak symbol is never bound locally in shared
2697 library. */
2698 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2699 || resolved_to_zero)
2700 {
2701 if (h->non_got_ref)
2702 {
2703 /* Keep dynamic non-GOT/non-PLT relocation so that we
2704 can branch to 0 without PLT. */
2705 struct elf_dyn_relocs **pp;
2706
2707 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2708 if (p->pc_count == 0)
2709 *pp = p->next;
2710 else
2711 {
2712 /* Remove non-R_386_PC32 relocation. */
2713 p->count = p->pc_count;
2714 pp = &p->next;
2715 }
2716
2717 if (eh->dyn_relocs != NULL)
2718 {
2719 /* Make sure undefined weak symbols are output
2720 as dynamic symbols in PIEs for dynamic non-GOT
2721 non-PLT reloations. */
2722 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2723 return FALSE;
2724 }
2725 }
2726 else
2727 eh->dyn_relocs = NULL;
2728 }
2729 else if (h->dynindx == -1
2730 && !h->forced_local)
2731 {
2732 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2733 return FALSE;
2734 }
2735 }
2736 }
2737 else if (ELIMINATE_COPY_RELOCS)
2738 {
2739 /* For the non-shared case, discard space for relocs against
2740 symbols which turn out to need copy relocs or are not
2741 dynamic. Keep dynamic relocations for run-time function
2742 pointer initialization. */
2743
2744 if ((!h->non_got_ref
2745 || eh->func_pointer_refcount > 0
2746 || (h->root.type == bfd_link_hash_undefweak
2747 && !resolved_to_zero))
2748 && ((h->def_dynamic
2749 && !h->def_regular)
2750 || (htab->elf.dynamic_sections_created
2751 && (h->root.type == bfd_link_hash_undefweak
2752 || h->root.type == bfd_link_hash_undefined))))
2753 {
2754 /* Make sure this symbol is output as a dynamic symbol.
2755 Undefined weak syms won't yet be marked as dynamic. */
2756 if (h->dynindx == -1
2757 && !h->forced_local
2758 && !resolved_to_zero)
2759 {
2760 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2761 return FALSE;
2762 }
2763
2764 /* If that succeeded, we know we'll be keeping all the
2765 relocs. */
2766 if (h->dynindx != -1)
2767 goto keep;
2768 }
2769
2770 eh->dyn_relocs = NULL;
2771 eh->func_pointer_refcount = 0;
2772
2773 keep: ;
2774 }
2775
2776 /* Finally, allocate space. */
2777 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2778 {
2779 asection *sreloc;
2780
2781 sreloc = elf_section_data (p->sec)->sreloc;
2782
2783 BFD_ASSERT (sreloc != NULL);
2784 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2785 }
2786
2787 return TRUE;
2788 }
2789
2790 /* Allocate space in .plt, .got and associated reloc sections for
2791 local dynamic relocs. */
2792
2793 static bfd_boolean
2794 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2795 {
2796 struct elf_link_hash_entry *h
2797 = (struct elf_link_hash_entry *) *slot;
2798
2799 if (h->type != STT_GNU_IFUNC
2800 || !h->def_regular
2801 || !h->ref_regular
2802 || !h->forced_local
2803 || h->root.type != bfd_link_hash_defined)
2804 abort ();
2805
2806 return elf_i386_allocate_dynrelocs (h, inf);
2807 }
2808
2809 /* Find any dynamic relocs that apply to read-only sections. */
2810
2811 static bfd_boolean
2812 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2813 {
2814 struct elf_i386_link_hash_entry *eh;
2815 struct elf_dyn_relocs *p;
2816
2817 /* Skip local IFUNC symbols. */
2818 if (h->forced_local && h->type == STT_GNU_IFUNC)
2819 return TRUE;
2820
2821 eh = (struct elf_i386_link_hash_entry *) h;
2822 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2823 {
2824 asection *s = p->sec->output_section;
2825
2826 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2827 {
2828 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2829
2830 info->flags |= DF_TEXTREL;
2831
2832 if ((info->warn_shared_textrel && bfd_link_pic (info))
2833 || info->error_textrel)
2834 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2835 p->sec->owner, h->root.root.string,
2836 p->sec);
2837
2838 /* Not an error, just cut short the traversal. */
2839 return FALSE;
2840 }
2841 }
2842 return TRUE;
2843 }
2844
2845 /* With the local symbol, foo, we convert
2846 mov foo@GOT[(%reg1)], %reg2
2847 to
2848 lea foo[@GOTOFF(%reg1)], %reg2
2849 and convert
2850 call/jmp *foo@GOT[(%reg)]
2851 to
2852 nop call foo/jmp foo nop
2853 When PIC is false, convert
2854 test %reg1, foo@GOT[(%reg2)]
2855 to
2856 test $foo, %reg1
2857 and convert
2858 binop foo@GOT[(%reg1)], %reg2
2859 to
2860 binop $foo, %reg2
2861 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2862 instructions. */
2863
2864 static bfd_boolean
2865 elf_i386_convert_load (bfd *abfd, asection *sec,
2866 struct bfd_link_info *link_info)
2867 {
2868 Elf_Internal_Shdr *symtab_hdr;
2869 Elf_Internal_Rela *internal_relocs;
2870 Elf_Internal_Rela *irel, *irelend;
2871 bfd_byte *contents;
2872 struct elf_i386_link_hash_table *htab;
2873 bfd_boolean changed_contents;
2874 bfd_boolean changed_relocs;
2875 bfd_boolean is_pic;
2876 bfd_signed_vma *local_got_refcounts;
2877
2878 /* Don't even try to convert non-ELF outputs. */
2879 if (!is_elf_hash_table (link_info->hash))
2880 return FALSE;
2881
2882 /* Nothing to do if there is no need or no output. */
2883 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2884 || sec->need_convert_load == 0
2885 || bfd_is_abs_section (sec->output_section))
2886 return TRUE;
2887
2888 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2889
2890 /* Load the relocations for this section. */
2891 internal_relocs = (_bfd_elf_link_read_relocs
2892 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2893 link_info->keep_memory));
2894 if (internal_relocs == NULL)
2895 return FALSE;
2896
2897 htab = elf_i386_hash_table (link_info);
2898 changed_contents = FALSE;
2899 changed_relocs = FALSE;
2900 local_got_refcounts = elf_local_got_refcounts (abfd);
2901
2902 is_pic = bfd_link_pic (link_info);
2903
2904 /* Get the section contents. */
2905 if (elf_section_data (sec)->this_hdr.contents != NULL)
2906 contents = elf_section_data (sec)->this_hdr.contents;
2907 else
2908 {
2909 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2910 goto error_return;
2911 }
2912
2913 irelend = internal_relocs + sec->reloc_count;
2914 for (irel = internal_relocs; irel < irelend; irel++)
2915 {
2916 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2917 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2918 unsigned int indx;
2919 struct elf_link_hash_entry *h;
2920 unsigned int opcode;
2921 unsigned int modrm;
2922 bfd_vma roff;
2923 bfd_boolean baseless;
2924 Elf_Internal_Sym *isym;
2925 unsigned int addend;
2926 unsigned int nop;
2927 bfd_vma nop_offset;
2928 bfd_boolean to_reloc_32;
2929
2930 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2931 continue;
2932
2933 roff = irel->r_offset;
2934 if (roff < 2)
2935 continue;
2936
2937 /* Addend for R_386_GOT32 and R_386_GOT32X relocations must be 0. */
2938 addend = bfd_get_32 (abfd, contents + roff);
2939 if (addend != 0)
2940 continue;
2941
2942 modrm = bfd_get_8 (abfd, contents + roff - 1);
2943 baseless = (modrm & 0xc7) == 0x5;
2944
2945 if (r_type == R_386_GOT32X && baseless && is_pic)
2946 {
2947 /* For PIC, disallow R_386_GOT32X without a base register
2948 since we don't know what the GOT base is. Allow
2949 R_386_GOT32 for existing object files. */
2950 const char *name;
2951
2952 if (r_symndx < symtab_hdr->sh_info)
2953 {
2954 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2955 r_symndx);
2956 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2957 }
2958 else
2959 {
2960 indx = r_symndx - symtab_hdr->sh_info;
2961 h = elf_sym_hashes (abfd)[indx];
2962 BFD_ASSERT (h != NULL);
2963 name = h->root.root.string;
2964 }
2965
2966 (*_bfd_error_handler)
2967 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2968 abfd, name);
2969 goto error_return;
2970 }
2971
2972 opcode = bfd_get_8 (abfd, contents + roff - 2);
2973
2974 /* Convert mov to lea since it has been done for a while. */
2975 if (opcode != 0x8b)
2976 {
2977 /* Only convert R_386_GOT32X relocation for call, jmp or
2978 one of adc, add, and, cmp, or, sbb, sub, test, xor
2979 instructions. */
2980 if (r_type != R_386_GOT32X)
2981 continue;
2982 }
2983
2984 /* Convert to R_386_32 if PIC is false or there is no base
2985 register. */
2986 to_reloc_32 = !is_pic || baseless;
2987
2988 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2989 referred to by the reloc. */
2990 if (r_symndx < symtab_hdr->sh_info)
2991 {
2992 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2993 abfd, r_symndx);
2994
2995 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2996 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2997 continue;
2998
2999 h = NULL;
3000 if (opcode == 0x0ff)
3001 /* Convert "call/jmp *foo@GOT[(%reg)]". */
3002 goto convert_branch;
3003 else
3004 /* Convert "mov foo@GOT[(%reg1)], %reg2",
3005 "test %reg1, foo@GOT(%reg2)" and
3006 "binop foo@GOT[(%reg1)], %reg2". */
3007 goto convert_load;
3008 }
3009
3010 indx = r_symndx - symtab_hdr->sh_info;
3011 h = elf_sym_hashes (abfd)[indx];
3012 BFD_ASSERT (h != NULL);
3013
3014 while (h->root.type == bfd_link_hash_indirect
3015 || h->root.type == bfd_link_hash_warning)
3016 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3017
3018 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3019 if (h->type == STT_GNU_IFUNC)
3020 continue;
3021
3022 /* Undefined weak symbol is only bound locally in executable
3023 and its reference is resolved as 0. */
3024 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
3025 elf_i386_hash_entry (h)))
3026 {
3027 if (opcode == 0xff)
3028 {
3029 /* No direct branch to 0 for PIC. */
3030 if (is_pic)
3031 continue;
3032 else
3033 goto convert_branch;
3034 }
3035 else
3036 {
3037 /* We can convert load of address 0 to R_386_32. */
3038 to_reloc_32 = TRUE;
3039 goto convert_load;
3040 }
3041 }
3042
3043 if (opcode == 0xff)
3044 {
3045 /* We have "call/jmp *foo@GOT[(%reg)]". */
3046 if ((h->root.type == bfd_link_hash_defined
3047 || h->root.type == bfd_link_hash_defweak)
3048 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3049 {
3050 /* The function is locally defined. */
3051 convert_branch:
3052 /* Convert R_386_GOT32X to R_386_PC32. */
3053 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
3054 {
3055 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3056 is a nop prefix. */
3057 modrm = 0xe8;
3058 nop = link_info->call_nop_byte;
3059 if (link_info->call_nop_as_suffix)
3060 {
3061 nop_offset = roff + 3;
3062 irel->r_offset -= 1;
3063 }
3064 else
3065 nop_offset = roff - 2;
3066 }
3067 else
3068 {
3069 /* Convert to "jmp foo nop". */
3070 modrm = 0xe9;
3071 nop = NOP_OPCODE;
3072 nop_offset = roff + 3;
3073 irel->r_offset -= 1;
3074 }
3075
3076 bfd_put_8 (abfd, nop, contents + nop_offset);
3077 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
3078 /* When converting to PC-relative relocation, we
3079 need to adjust addend by -4. */
3080 bfd_put_32 (abfd, -4, contents + irel->r_offset);
3081 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
3082
3083 if (h)
3084 {
3085 if (h->got.refcount > 0)
3086 h->got.refcount -= 1;
3087 }
3088 else
3089 {
3090 if (local_got_refcounts != NULL
3091 && local_got_refcounts[r_symndx] > 0)
3092 local_got_refcounts[r_symndx] -= 1;
3093 }
3094
3095 changed_contents = TRUE;
3096 changed_relocs = TRUE;
3097 }
3098 }
3099 else
3100 {
3101 /* We have "mov foo@GOT[(%re1g)], %reg2",
3102 "test %reg1, foo@GOT(%reg2)" and
3103 "binop foo@GOT[(%reg1)], %reg2".
3104
3105 Avoid optimizing _DYNAMIC since ld.so may use its
3106 link-time address. */
3107 if (h == htab->elf.hdynamic)
3108 continue;
3109
3110 /* def_regular is set by an assignment in a linker script in
3111 bfd_elf_record_link_assignment. */
3112 if ((h->def_regular
3113 || h->root.type == bfd_link_hash_defined
3114 || h->root.type == bfd_link_hash_defweak)
3115 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3116 {
3117 convert_load:
3118 if (opcode == 0x8b)
3119 {
3120 if (to_reloc_32)
3121 {
3122 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
3123 "mov $foo, %reg2" with R_386_32. */
3124 r_type = R_386_32;
3125 modrm = 0xc0 | (modrm & 0x38) >> 3;
3126 bfd_put_8 (abfd, modrm, contents + roff - 1);
3127 opcode = 0xc7;
3128 }
3129 else
3130 {
3131 /* Convert "mov foo@GOT(%reg1), %reg2" to
3132 "lea foo@GOTOFF(%reg1), %reg2". */
3133 r_type = R_386_GOTOFF;
3134 opcode = 0x8d;
3135 }
3136 }
3137 else
3138 {
3139 /* Only R_386_32 is supported. */
3140 if (!to_reloc_32)
3141 continue;
3142
3143 if (opcode == 0x85)
3144 {
3145 /* Convert "test %reg1, foo@GOT(%reg2)" to
3146 "test $foo, %reg1". */
3147 modrm = 0xc0 | (modrm & 0x38) >> 3;
3148 opcode = 0xf7;
3149 }
3150 else
3151 {
3152 /* Convert "binop foo@GOT(%reg1), %reg2" to
3153 "binop $foo, %reg2". */
3154 modrm = (0xc0
3155 | (modrm & 0x38) >> 3
3156 | (opcode & 0x3c));
3157 opcode = 0x81;
3158 }
3159 bfd_put_8 (abfd, modrm, contents + roff - 1);
3160 r_type = R_386_32;
3161 }
3162
3163 bfd_put_8 (abfd, opcode, contents + roff - 2);
3164 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3165
3166 if (h)
3167 {
3168 if (h->got.refcount > 0)
3169 h->got.refcount -= 1;
3170 }
3171 else
3172 {
3173 if (local_got_refcounts != NULL
3174 && local_got_refcounts[r_symndx] > 0)
3175 local_got_refcounts[r_symndx] -= 1;
3176 }
3177
3178 changed_contents = TRUE;
3179 changed_relocs = TRUE;
3180 }
3181 }
3182 }
3183
3184 if (contents != NULL
3185 && elf_section_data (sec)->this_hdr.contents != contents)
3186 {
3187 if (!changed_contents && !link_info->keep_memory)
3188 free (contents);
3189 else
3190 {
3191 /* Cache the section contents for elf_link_input_bfd. */
3192 elf_section_data (sec)->this_hdr.contents = contents;
3193 }
3194 }
3195
3196 if (elf_section_data (sec)->relocs != internal_relocs)
3197 {
3198 if (!changed_relocs)
3199 free (internal_relocs);
3200 else
3201 elf_section_data (sec)->relocs = internal_relocs;
3202 }
3203
3204 return TRUE;
3205
3206 error_return:
3207 if (contents != NULL
3208 && elf_section_data (sec)->this_hdr.contents != contents)
3209 free (contents);
3210 if (internal_relocs != NULL
3211 && elf_section_data (sec)->relocs != internal_relocs)
3212 free (internal_relocs);
3213 return FALSE;
3214 }
3215
3216 /* Set the sizes of the dynamic sections. */
3217
3218 static bfd_boolean
3219 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3220 {
3221 struct elf_i386_link_hash_table *htab;
3222 bfd *dynobj;
3223 asection *s;
3224 bfd_boolean relocs;
3225 bfd *ibfd;
3226
3227 htab = elf_i386_hash_table (info);
3228 if (htab == NULL)
3229 return FALSE;
3230 dynobj = htab->elf.dynobj;
3231 if (dynobj == NULL)
3232 abort ();
3233
3234 if (htab->elf.dynamic_sections_created)
3235 {
3236 /* Set the contents of the .interp section to the interpreter. */
3237 if (bfd_link_executable (info) && !info->nointerp)
3238 {
3239 s = bfd_get_linker_section (dynobj, ".interp");
3240 if (s == NULL)
3241 abort ();
3242 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3243 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3244 htab->interp = s;
3245 }
3246 }
3247
3248 /* Set up .got offsets for local syms, and space for local dynamic
3249 relocs. */
3250 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3251 {
3252 bfd_signed_vma *local_got;
3253 bfd_signed_vma *end_local_got;
3254 char *local_tls_type;
3255 bfd_vma *local_tlsdesc_gotent;
3256 bfd_size_type locsymcount;
3257 Elf_Internal_Shdr *symtab_hdr;
3258 asection *srel;
3259
3260 if (! is_i386_elf (ibfd))
3261 continue;
3262
3263 for (s = ibfd->sections; s != NULL; s = s->next)
3264 {
3265 struct elf_dyn_relocs *p;
3266
3267 if (!elf_i386_convert_load (ibfd, s, info))
3268 return FALSE;
3269
3270 for (p = ((struct elf_dyn_relocs *)
3271 elf_section_data (s)->local_dynrel);
3272 p != NULL;
3273 p = p->next)
3274 {
3275 if (!bfd_is_abs_section (p->sec)
3276 && bfd_is_abs_section (p->sec->output_section))
3277 {
3278 /* Input section has been discarded, either because
3279 it is a copy of a linkonce section or due to
3280 linker script /DISCARD/, so we'll be discarding
3281 the relocs too. */
3282 }
3283 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3284 && strcmp (p->sec->output_section->name,
3285 ".tls_vars") == 0)
3286 {
3287 /* Relocations in vxworks .tls_vars sections are
3288 handled specially by the loader. */
3289 }
3290 else if (p->count != 0)
3291 {
3292 srel = elf_section_data (p->sec)->sreloc;
3293 srel->size += p->count * sizeof (Elf32_External_Rel);
3294 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3295 && (info->flags & DF_TEXTREL) == 0)
3296 {
3297 info->flags |= DF_TEXTREL;
3298 if ((info->warn_shared_textrel && bfd_link_pic (info))
3299 || info->error_textrel)
3300 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3301 p->sec->owner, p->sec);
3302 }
3303 }
3304 }
3305 }
3306
3307 local_got = elf_local_got_refcounts (ibfd);
3308 if (!local_got)
3309 continue;
3310
3311 symtab_hdr = &elf_symtab_hdr (ibfd);
3312 locsymcount = symtab_hdr->sh_info;
3313 end_local_got = local_got + locsymcount;
3314 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3315 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3316 s = htab->elf.sgot;
3317 srel = htab->elf.srelgot;
3318 for (; local_got < end_local_got;
3319 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3320 {
3321 *local_tlsdesc_gotent = (bfd_vma) -1;
3322 if (*local_got > 0)
3323 {
3324 if (GOT_TLS_GDESC_P (*local_tls_type))
3325 {
3326 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3327 - elf_i386_compute_jump_table_size (htab);
3328 htab->elf.sgotplt->size += 8;
3329 *local_got = (bfd_vma) -2;
3330 }
3331 if (! GOT_TLS_GDESC_P (*local_tls_type)
3332 || GOT_TLS_GD_P (*local_tls_type))
3333 {
3334 *local_got = s->size;
3335 s->size += 4;
3336 if (GOT_TLS_GD_P (*local_tls_type)
3337 || *local_tls_type == GOT_TLS_IE_BOTH)
3338 s->size += 4;
3339 }
3340 if (bfd_link_pic (info)
3341 || GOT_TLS_GD_ANY_P (*local_tls_type)
3342 || (*local_tls_type & GOT_TLS_IE))
3343 {
3344 if (*local_tls_type == GOT_TLS_IE_BOTH)
3345 srel->size += 2 * sizeof (Elf32_External_Rel);
3346 else if (GOT_TLS_GD_P (*local_tls_type)
3347 || ! GOT_TLS_GDESC_P (*local_tls_type))
3348 srel->size += sizeof (Elf32_External_Rel);
3349 if (GOT_TLS_GDESC_P (*local_tls_type))
3350 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3351 }
3352 }
3353 else
3354 *local_got = (bfd_vma) -1;
3355 }
3356 }
3357
3358 if (htab->tls_ldm_got.refcount > 0)
3359 {
3360 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3361 relocs. */
3362 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3363 htab->elf.sgot->size += 8;
3364 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3365 }
3366 else
3367 htab->tls_ldm_got.offset = -1;
3368
3369 /* Allocate global sym .plt and .got entries, and space for global
3370 sym dynamic relocs. */
3371 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3372
3373 /* Allocate .plt and .got entries, and space for local symbols. */
3374 htab_traverse (htab->loc_hash_table,
3375 elf_i386_allocate_local_dynrelocs,
3376 info);
3377
3378 /* For every jump slot reserved in the sgotplt, reloc_count is
3379 incremented. However, when we reserve space for TLS descriptors,
3380 it's not incremented, so in order to compute the space reserved
3381 for them, it suffices to multiply the reloc count by the jump
3382 slot size.
3383
3384 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3385 so that R_386_IRELATIVE entries come last. */
3386 if (htab->elf.srelplt)
3387 {
3388 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3389 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3390 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3391 }
3392 else if (htab->elf.irelplt)
3393 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3394
3395
3396 if (htab->elf.sgotplt)
3397 {
3398 /* Don't allocate .got.plt section if there are no GOT nor PLT
3399 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3400 if ((htab->elf.hgot == NULL
3401 || !htab->elf.hgot->ref_regular_nonweak)
3402 && (htab->elf.sgotplt->size
3403 == get_elf_backend_data (output_bfd)->got_header_size)
3404 && (htab->elf.splt == NULL
3405 || htab->elf.splt->size == 0)
3406 && (htab->elf.sgot == NULL
3407 || htab->elf.sgot->size == 0)
3408 && (htab->elf.iplt == NULL
3409 || htab->elf.iplt->size == 0)
3410 && (htab->elf.igotplt == NULL
3411 || htab->elf.igotplt->size == 0))
3412 htab->elf.sgotplt->size = 0;
3413 }
3414
3415
3416 if (htab->plt_eh_frame != NULL
3417 && htab->elf.splt != NULL
3418 && htab->elf.splt->size != 0
3419 && !bfd_is_abs_section (htab->elf.splt->output_section)
3420 && _bfd_elf_eh_frame_present (info))
3421 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3422
3423 /* We now have determined the sizes of the various dynamic sections.
3424 Allocate memory for them. */
3425 relocs = FALSE;
3426 for (s = dynobj->sections; s != NULL; s = s->next)
3427 {
3428 bfd_boolean strip_section = TRUE;
3429
3430 if ((s->flags & SEC_LINKER_CREATED) == 0)
3431 continue;
3432
3433 if (s == htab->elf.splt
3434 || s == htab->elf.sgot)
3435 {
3436 /* Strip this section if we don't need it; see the
3437 comment below. */
3438 /* We'd like to strip these sections if they aren't needed, but if
3439 we've exported dynamic symbols from them we must leave them.
3440 It's too late to tell BFD to get rid of the symbols. */
3441
3442 if (htab->elf.hplt != NULL)
3443 strip_section = FALSE;
3444 }
3445 else if (s == htab->elf.sgotplt
3446 || s == htab->elf.iplt
3447 || s == htab->elf.igotplt
3448 || s == htab->plt_got
3449 || s == htab->plt_eh_frame
3450 || s == htab->sdynbss)
3451 {
3452 /* Strip these too. */
3453 }
3454 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3455 {
3456 if (s->size != 0
3457 && s != htab->elf.srelplt
3458 && s != htab->srelplt2)
3459 relocs = TRUE;
3460
3461 /* We use the reloc_count field as a counter if we need
3462 to copy relocs into the output file. */
3463 s->reloc_count = 0;
3464 }
3465 else
3466 {
3467 /* It's not one of our sections, so don't allocate space. */
3468 continue;
3469 }
3470
3471 if (s->size == 0)
3472 {
3473 /* If we don't need this section, strip it from the
3474 output file. This is mostly to handle .rel.bss and
3475 .rel.plt. We must create both sections in
3476 create_dynamic_sections, because they must be created
3477 before the linker maps input sections to output
3478 sections. The linker does that before
3479 adjust_dynamic_symbol is called, and it is that
3480 function which decides whether anything needs to go
3481 into these sections. */
3482 if (strip_section)
3483 s->flags |= SEC_EXCLUDE;
3484 continue;
3485 }
3486
3487 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3488 continue;
3489
3490 /* Allocate memory for the section contents. We use bfd_zalloc
3491 here in case unused entries are not reclaimed before the
3492 section's contents are written out. This should not happen,
3493 but this way if it does, we get a R_386_NONE reloc instead
3494 of garbage. */
3495 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3496 if (s->contents == NULL)
3497 return FALSE;
3498 }
3499
3500 if (htab->plt_eh_frame != NULL
3501 && htab->plt_eh_frame->contents != NULL)
3502 {
3503 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3504 sizeof (elf_i386_eh_frame_plt));
3505 bfd_put_32 (dynobj, htab->elf.splt->size,
3506 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3507 }
3508
3509 if (htab->elf.dynamic_sections_created)
3510 {
3511 /* Add some entries to the .dynamic section. We fill in the
3512 values later, in elf_i386_finish_dynamic_sections, but we
3513 must add the entries now so that we get the correct size for
3514 the .dynamic section. The DT_DEBUG entry is filled in by the
3515 dynamic linker and used by the debugger. */
3516 #define add_dynamic_entry(TAG, VAL) \
3517 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3518
3519 if (bfd_link_executable (info))
3520 {
3521 if (!add_dynamic_entry (DT_DEBUG, 0))
3522 return FALSE;
3523 }
3524
3525 if (htab->elf.splt->size != 0)
3526 {
3527 /* DT_PLTGOT is used by prelink even if there is no PLT
3528 relocation. */
3529 if (!add_dynamic_entry (DT_PLTGOT, 0))
3530 return FALSE;
3531
3532 if (htab->elf.srelplt->size != 0)
3533 {
3534 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3535 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3536 || !add_dynamic_entry (DT_JMPREL, 0))
3537 return FALSE;
3538 }
3539 }
3540
3541 if (relocs)
3542 {
3543 if (!add_dynamic_entry (DT_REL, 0)
3544 || !add_dynamic_entry (DT_RELSZ, 0)
3545 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3546 return FALSE;
3547
3548 /* If any dynamic relocs apply to a read-only section,
3549 then we need a DT_TEXTREL entry. */
3550 if ((info->flags & DF_TEXTREL) == 0)
3551 elf_link_hash_traverse (&htab->elf,
3552 elf_i386_readonly_dynrelocs, info);
3553
3554 if ((info->flags & DF_TEXTREL) != 0)
3555 {
3556 if ((elf_tdata (output_bfd)->has_gnu_symbols
3557 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3558 {
3559 info->callbacks->einfo
3560 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3561 bfd_set_error (bfd_error_bad_value);
3562 return FALSE;
3563 }
3564
3565 if (!add_dynamic_entry (DT_TEXTREL, 0))
3566 return FALSE;
3567 }
3568 }
3569 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3570 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3571 return FALSE;
3572 }
3573 #undef add_dynamic_entry
3574
3575 return TRUE;
3576 }
3577
3578 static bfd_boolean
3579 elf_i386_always_size_sections (bfd *output_bfd,
3580 struct bfd_link_info *info)
3581 {
3582 asection *tls_sec = elf_hash_table (info)->tls_sec;
3583
3584 if (tls_sec)
3585 {
3586 struct elf_link_hash_entry *tlsbase;
3587
3588 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3589 "_TLS_MODULE_BASE_",
3590 FALSE, FALSE, FALSE);
3591
3592 if (tlsbase && tlsbase->type == STT_TLS)
3593 {
3594 struct elf_i386_link_hash_table *htab;
3595 struct bfd_link_hash_entry *bh = NULL;
3596 const struct elf_backend_data *bed
3597 = get_elf_backend_data (output_bfd);
3598
3599 htab = elf_i386_hash_table (info);
3600 if (htab == NULL)
3601 return FALSE;
3602
3603 if (!(_bfd_generic_link_add_one_symbol
3604 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3605 tls_sec, 0, NULL, FALSE,
3606 bed->collect, &bh)))
3607 return FALSE;
3608
3609 htab->tls_module_base = bh;
3610
3611 tlsbase = (struct elf_link_hash_entry *)bh;
3612 tlsbase->def_regular = 1;
3613 tlsbase->other = STV_HIDDEN;
3614 tlsbase->root.linker_def = 1;
3615 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3616 }
3617 }
3618
3619 return TRUE;
3620 }
3621
3622 /* Set the correct type for an x86 ELF section. We do this by the
3623 section name, which is a hack, but ought to work. */
3624
3625 static bfd_boolean
3626 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3627 Elf_Internal_Shdr *hdr,
3628 asection *sec)
3629 {
3630 const char *name;
3631
3632 name = bfd_get_section_name (abfd, sec);
3633
3634 /* This is an ugly, but unfortunately necessary hack that is
3635 needed when producing EFI binaries on x86. It tells
3636 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3637 containing ELF relocation info. We need this hack in order to
3638 be able to generate ELF binaries that can be translated into
3639 EFI applications (which are essentially COFF objects). Those
3640 files contain a COFF ".reloc" section inside an ELFNN object,
3641 which would normally cause BFD to segfault because it would
3642 attempt to interpret this section as containing relocation
3643 entries for section "oc". With this hack enabled, ".reloc"
3644 will be treated as a normal data section, which will avoid the
3645 segfault. However, you won't be able to create an ELFNN binary
3646 with a section named "oc" that needs relocations, but that's
3647 the kind of ugly side-effects you get when detecting section
3648 types based on their names... In practice, this limitation is
3649 unlikely to bite. */
3650 if (strcmp (name, ".reloc") == 0)
3651 hdr->sh_type = SHT_PROGBITS;
3652
3653 return TRUE;
3654 }
3655
3656 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3657 executables. Rather than setting it to the beginning of the TLS
3658 section, we have to set it to the end. This function may be called
3659 multiple times, it is idempotent. */
3660
3661 static void
3662 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3663 {
3664 struct elf_i386_link_hash_table *htab;
3665 struct bfd_link_hash_entry *base;
3666
3667 if (!bfd_link_executable (info))
3668 return;
3669
3670 htab = elf_i386_hash_table (info);
3671 if (htab == NULL)
3672 return;
3673
3674 base = htab->tls_module_base;
3675 if (base == NULL)
3676 return;
3677
3678 base->u.def.value = htab->elf.tls_size;
3679 }
3680
3681 /* Return the base VMA address which should be subtracted from real addresses
3682 when resolving @dtpoff relocation.
3683 This is PT_TLS segment p_vaddr. */
3684
3685 static bfd_vma
3686 elf_i386_dtpoff_base (struct bfd_link_info *info)
3687 {
3688 /* If tls_sec is NULL, we should have signalled an error already. */
3689 if (elf_hash_table (info)->tls_sec == NULL)
3690 return 0;
3691 return elf_hash_table (info)->tls_sec->vma;
3692 }
3693
3694 /* Return the relocation value for @tpoff relocation
3695 if STT_TLS virtual address is ADDRESS. */
3696
3697 static bfd_vma
3698 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3699 {
3700 struct elf_link_hash_table *htab = elf_hash_table (info);
3701 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3702 bfd_vma static_tls_size;
3703
3704 /* If tls_sec is NULL, we should have signalled an error already. */
3705 if (htab->tls_sec == NULL)
3706 return 0;
3707
3708 /* Consider special static TLS alignment requirements. */
3709 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3710 return static_tls_size + htab->tls_sec->vma - address;
3711 }
3712
3713 /* Relocate an i386 ELF section. */
3714
3715 static bfd_boolean
3716 elf_i386_relocate_section (bfd *output_bfd,
3717 struct bfd_link_info *info,
3718 bfd *input_bfd,
3719 asection *input_section,
3720 bfd_byte *contents,
3721 Elf_Internal_Rela *relocs,
3722 Elf_Internal_Sym *local_syms,
3723 asection **local_sections)
3724 {
3725 struct elf_i386_link_hash_table *htab;
3726 Elf_Internal_Shdr *symtab_hdr;
3727 struct elf_link_hash_entry **sym_hashes;
3728 bfd_vma *local_got_offsets;
3729 bfd_vma *local_tlsdesc_gotents;
3730 Elf_Internal_Rela *rel;
3731 Elf_Internal_Rela *wrel;
3732 Elf_Internal_Rela *relend;
3733 bfd_boolean is_vxworks_tls;
3734 unsigned plt_entry_size;
3735
3736 BFD_ASSERT (is_i386_elf (input_bfd));
3737
3738 htab = elf_i386_hash_table (info);
3739 if (htab == NULL)
3740 return FALSE;
3741 symtab_hdr = &elf_symtab_hdr (input_bfd);
3742 sym_hashes = elf_sym_hashes (input_bfd);
3743 local_got_offsets = elf_local_got_offsets (input_bfd);
3744 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3745 /* We have to handle relocations in vxworks .tls_vars sections
3746 specially, because the dynamic loader is 'weird'. */
3747 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3748 && bfd_link_pic (info)
3749 && !strcmp (input_section->output_section->name,
3750 ".tls_vars"));
3751
3752 elf_i386_set_tls_module_base (info);
3753
3754 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3755
3756 rel = wrel = relocs;
3757 relend = relocs + input_section->reloc_count;
3758 for (; rel < relend; wrel++, rel++)
3759 {
3760 unsigned int r_type;
3761 reloc_howto_type *howto;
3762 unsigned long r_symndx;
3763 struct elf_link_hash_entry *h;
3764 struct elf_i386_link_hash_entry *eh;
3765 Elf_Internal_Sym *sym;
3766 asection *sec;
3767 bfd_vma off, offplt, plt_offset;
3768 bfd_vma relocation;
3769 bfd_boolean unresolved_reloc;
3770 bfd_reloc_status_type r;
3771 unsigned int indx;
3772 int tls_type;
3773 bfd_vma st_size;
3774 asection *resolved_plt;
3775 bfd_boolean resolved_to_zero;
3776
3777 r_type = ELF32_R_TYPE (rel->r_info);
3778 if (r_type == R_386_GNU_VTINHERIT
3779 || r_type == R_386_GNU_VTENTRY)
3780 {
3781 if (wrel != rel)
3782 *wrel = *rel;
3783 continue;
3784 }
3785
3786 if ((indx = r_type) >= R_386_standard
3787 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3788 >= R_386_ext - R_386_standard)
3789 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3790 >= R_386_ext2 - R_386_ext))
3791 {
3792 (*_bfd_error_handler)
3793 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3794 input_bfd, input_section, r_type);
3795 bfd_set_error (bfd_error_bad_value);
3796 return FALSE;
3797 }
3798 howto = elf_howto_table + indx;
3799
3800 r_symndx = ELF32_R_SYM (rel->r_info);
3801 h = NULL;
3802 sym = NULL;
3803 sec = NULL;
3804 unresolved_reloc = FALSE;
3805 if (r_symndx < symtab_hdr->sh_info)
3806 {
3807 sym = local_syms + r_symndx;
3808 sec = local_sections[r_symndx];
3809 relocation = (sec->output_section->vma
3810 + sec->output_offset
3811 + sym->st_value);
3812 st_size = sym->st_size;
3813
3814 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3815 && ((sec->flags & SEC_MERGE) != 0
3816 || (bfd_link_relocatable (info)
3817 && sec->output_offset != 0)))
3818 {
3819 bfd_vma addend;
3820 bfd_byte *where = contents + rel->r_offset;
3821
3822 switch (howto->size)
3823 {
3824 case 0:
3825 addend = bfd_get_8 (input_bfd, where);
3826 if (howto->pc_relative)
3827 {
3828 addend = (addend ^ 0x80) - 0x80;
3829 addend += 1;
3830 }
3831 break;
3832 case 1:
3833 addend = bfd_get_16 (input_bfd, where);
3834 if (howto->pc_relative)
3835 {
3836 addend = (addend ^ 0x8000) - 0x8000;
3837 addend += 2;
3838 }
3839 break;
3840 case 2:
3841 addend = bfd_get_32 (input_bfd, where);
3842 if (howto->pc_relative)
3843 {
3844 addend = (addend ^ 0x80000000) - 0x80000000;
3845 addend += 4;
3846 }
3847 break;
3848 default:
3849 abort ();
3850 }
3851
3852 if (bfd_link_relocatable (info))
3853 addend += sec->output_offset;
3854 else
3855 {
3856 asection *msec = sec;
3857 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3858 addend);
3859 addend -= relocation;
3860 addend += msec->output_section->vma + msec->output_offset;
3861 }
3862
3863 switch (howto->size)
3864 {
3865 case 0:
3866 /* FIXME: overflow checks. */
3867 if (howto->pc_relative)
3868 addend -= 1;
3869 bfd_put_8 (input_bfd, addend, where);
3870 break;
3871 case 1:
3872 if (howto->pc_relative)
3873 addend -= 2;
3874 bfd_put_16 (input_bfd, addend, where);
3875 break;
3876 case 2:
3877 if (howto->pc_relative)
3878 addend -= 4;
3879 bfd_put_32 (input_bfd, addend, where);
3880 break;
3881 }
3882 }
3883 else if (!bfd_link_relocatable (info)
3884 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3885 {
3886 /* Relocate against local STT_GNU_IFUNC symbol. */
3887 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3888 FALSE);
3889 if (h == NULL)
3890 abort ();
3891
3892 /* Set STT_GNU_IFUNC symbol value. */
3893 h->root.u.def.value = sym->st_value;
3894 h->root.u.def.section = sec;
3895 }
3896 }
3897 else
3898 {
3899 bfd_boolean warned ATTRIBUTE_UNUSED;
3900 bfd_boolean ignored ATTRIBUTE_UNUSED;
3901
3902 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3903 r_symndx, symtab_hdr, sym_hashes,
3904 h, sec, relocation,
3905 unresolved_reloc, warned, ignored);
3906 st_size = h->size;
3907 }
3908
3909 if (sec != NULL && discarded_section (sec))
3910 {
3911 _bfd_clear_contents (howto, input_bfd, input_section,
3912 contents + rel->r_offset);
3913 wrel->r_offset = rel->r_offset;
3914 wrel->r_info = 0;
3915 wrel->r_addend = 0;
3916
3917 /* For ld -r, remove relocations in debug sections against
3918 sections defined in discarded sections. Not done for
3919 eh_frame editing code expects to be present. */
3920 if (bfd_link_relocatable (info)
3921 && (input_section->flags & SEC_DEBUGGING))
3922 wrel--;
3923
3924 continue;
3925 }
3926
3927 if (bfd_link_relocatable (info))
3928 {
3929 if (wrel != rel)
3930 *wrel = *rel;
3931 continue;
3932 }
3933
3934 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3935 it here if it is defined in a non-shared object. */
3936 if (h != NULL
3937 && h->type == STT_GNU_IFUNC
3938 && h->def_regular)
3939 {
3940 asection *plt, *gotplt, *base_got;
3941 bfd_vma plt_index;
3942 const char *name;
3943
3944 if ((input_section->flags & SEC_ALLOC) == 0)
3945 {
3946 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3947 sections because such sections are not SEC_ALLOC and
3948 thus ld.so will not process them. */
3949 if ((input_section->flags & SEC_DEBUGGING) != 0)
3950 continue;
3951 abort ();
3952 }
3953 else if (h->plt.offset == (bfd_vma) -1)
3954 abort ();
3955
3956 /* STT_GNU_IFUNC symbol must go through PLT. */
3957 if (htab->elf.splt != NULL)
3958 {
3959 plt = htab->elf.splt;
3960 gotplt = htab->elf.sgotplt;
3961 }
3962 else
3963 {
3964 plt = htab->elf.iplt;
3965 gotplt = htab->elf.igotplt;
3966 }
3967
3968 relocation = (plt->output_section->vma
3969 + plt->output_offset + h->plt.offset);
3970
3971 switch (r_type)
3972 {
3973 default:
3974 if (h->root.root.string)
3975 name = h->root.root.string;
3976 else
3977 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3978 NULL);
3979 (*_bfd_error_handler)
3980 (_("%B: relocation %s against STT_GNU_IFUNC "
3981 "symbol `%s' isn't handled by %s"), input_bfd,
3982 elf_howto_table[r_type].name,
3983 name, __FUNCTION__);
3984 bfd_set_error (bfd_error_bad_value);
3985 return FALSE;
3986
3987 case R_386_32:
3988 /* Generate dynamic relcoation only when there is a
3989 non-GOT reference in a shared object. */
3990 if (bfd_link_pic (info) && h->non_got_ref)
3991 {
3992 Elf_Internal_Rela outrel;
3993 asection *sreloc;
3994 bfd_vma offset;
3995
3996 /* Need a dynamic relocation to get the real function
3997 adddress. */
3998 offset = _bfd_elf_section_offset (output_bfd,
3999 info,
4000 input_section,
4001 rel->r_offset);
4002 if (offset == (bfd_vma) -1
4003 || offset == (bfd_vma) -2)
4004 abort ();
4005
4006 outrel.r_offset = (input_section->output_section->vma
4007 + input_section->output_offset
4008 + offset);
4009
4010 if (h->dynindx == -1
4011 || h->forced_local
4012 || bfd_link_executable (info))
4013 {
4014 /* This symbol is resolved locally. */
4015 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4016 bfd_put_32 (output_bfd,
4017 (h->root.u.def.value
4018 + h->root.u.def.section->output_section->vma
4019 + h->root.u.def.section->output_offset),
4020 contents + offset);
4021 }
4022 else
4023 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4024
4025 sreloc = htab->elf.irelifunc;
4026 elf_append_rel (output_bfd, sreloc, &outrel);
4027
4028 /* If this reloc is against an external symbol, we
4029 do not want to fiddle with the addend. Otherwise,
4030 we need to include the symbol value so that it
4031 becomes an addend for the dynamic reloc. For an
4032 internal symbol, we have updated addend. */
4033 continue;
4034 }
4035 /* FALLTHROUGH */
4036 case R_386_PC32:
4037 case R_386_PLT32:
4038 goto do_relocation;
4039
4040 case R_386_GOT32:
4041 case R_386_GOT32X:
4042 base_got = htab->elf.sgot;
4043 off = h->got.offset;
4044
4045 if (base_got == NULL)
4046 abort ();
4047
4048 if (off == (bfd_vma) -1)
4049 {
4050 /* We can't use h->got.offset here to save state, or
4051 even just remember the offset, as finish_dynamic_symbol
4052 would use that as offset into .got. */
4053
4054 if (htab->elf.splt != NULL)
4055 {
4056 plt_index = h->plt.offset / plt_entry_size - 1;
4057 off = (plt_index + 3) * 4;
4058 base_got = htab->elf.sgotplt;
4059 }
4060 else
4061 {
4062 plt_index = h->plt.offset / plt_entry_size;
4063 off = plt_index * 4;
4064 base_got = htab->elf.igotplt;
4065 }
4066
4067 if (h->dynindx == -1
4068 || h->forced_local
4069 || info->symbolic)
4070 {
4071 /* This references the local defitionion. We must
4072 initialize this entry in the global offset table.
4073 Since the offset must always be a multiple of 8,
4074 we use the least significant bit to record
4075 whether we have initialized it already.
4076
4077 When doing a dynamic link, we create a .rela.got
4078 relocation entry to initialize the value. This
4079 is done in the finish_dynamic_symbol routine. */
4080 if ((off & 1) != 0)
4081 off &= ~1;
4082 else
4083 {
4084 bfd_put_32 (output_bfd, relocation,
4085 base_got->contents + off);
4086 h->got.offset |= 1;
4087 }
4088 }
4089
4090 relocation = off;
4091
4092 /* Adjust for static executables. */
4093 if (htab->elf.splt == NULL)
4094 relocation += gotplt->output_offset;
4095 }
4096 else
4097 {
4098 relocation = (base_got->output_section->vma
4099 + base_got->output_offset + off
4100 - gotplt->output_section->vma
4101 - gotplt->output_offset);
4102 /* Adjust for static executables. */
4103 if (htab->elf.splt == NULL)
4104 relocation += gotplt->output_offset;
4105 }
4106
4107 goto do_relocation;
4108
4109 case R_386_GOTOFF:
4110 relocation -= (gotplt->output_section->vma
4111 + gotplt->output_offset);
4112 goto do_relocation;
4113 }
4114 }
4115
4116 eh = (struct elf_i386_link_hash_entry *) h;
4117 resolved_to_zero = (eh != NULL
4118 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
4119
4120 switch (r_type)
4121 {
4122 case R_386_GOT32X:
4123 /* Avoid optimizing _DYNAMIC since ld.so may use its
4124 link-time address. */
4125 if (h == htab->elf.hdynamic)
4126 goto r_386_got32;
4127
4128 if (bfd_link_pic (info))
4129 {
4130 /* It is OK to convert mov to lea and convert indirect
4131 branch to direct branch. It is OK to convert adc,
4132 add, and, cmp, or, sbb, sub, test, xor only when PIC
4133 is false. */
4134 unsigned int opcode, addend;
4135 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4136 if (addend != 0)
4137 goto r_386_got32;
4138 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4139 if (opcode != 0x8b && opcode != 0xff)
4140 goto r_386_got32;
4141 }
4142
4143 /* Resolve "mov GOT[(%reg)], %reg",
4144 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4145 and "binop foo@GOT[(%reg)], %reg". */
4146 if (h == NULL
4147 || (h->plt.offset == (bfd_vma) -1
4148 && h->got.offset == (bfd_vma) -1)
4149 || htab->elf.sgotplt == NULL)
4150 abort ();
4151
4152 offplt = (htab->elf.sgotplt->output_section->vma
4153 + htab->elf.sgotplt->output_offset);
4154
4155 /* It is relative to .got.plt section. */
4156 if (h->got.offset != (bfd_vma) -1)
4157 /* Use GOT entry. Mask off the least significant bit in
4158 GOT offset which may be set by R_386_GOT32 processing
4159 below. */
4160 relocation = (htab->elf.sgot->output_section->vma
4161 + htab->elf.sgot->output_offset
4162 + (h->got.offset & ~1) - offplt);
4163 else
4164 /* Use GOTPLT entry. */
4165 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4166
4167 if (!bfd_link_pic (info))
4168 {
4169 /* If not PIC, add the .got.plt section address for
4170 baseless addressing. */
4171 unsigned int modrm;
4172 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4173 if ((modrm & 0xc7) == 0x5)
4174 relocation += offplt;
4175 }
4176
4177 unresolved_reloc = FALSE;
4178 break;
4179
4180 case R_386_GOT32:
4181 r_386_got32:
4182 /* Relocation is to the entry for this symbol in the global
4183 offset table. */
4184 if (htab->elf.sgot == NULL)
4185 abort ();
4186
4187 if (h != NULL)
4188 {
4189 bfd_boolean dyn;
4190
4191 off = h->got.offset;
4192 dyn = htab->elf.dynamic_sections_created;
4193 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4194 bfd_link_pic (info),
4195 h)
4196 || (bfd_link_pic (info)
4197 && SYMBOL_REFERENCES_LOCAL (info, h))
4198 || (ELF_ST_VISIBILITY (h->other)
4199 && h->root.type == bfd_link_hash_undefweak))
4200 {
4201 /* This is actually a static link, or it is a
4202 -Bsymbolic link and the symbol is defined
4203 locally, or the symbol was forced to be local
4204 because of a version file. We must initialize
4205 this entry in the global offset table. Since the
4206 offset must always be a multiple of 4, we use the
4207 least significant bit to record whether we have
4208 initialized it already.
4209
4210 When doing a dynamic link, we create a .rel.got
4211 relocation entry to initialize the value. This
4212 is done in the finish_dynamic_symbol routine. */
4213 if ((off & 1) != 0)
4214 off &= ~1;
4215 else
4216 {
4217 bfd_put_32 (output_bfd, relocation,
4218 htab->elf.sgot->contents + off);
4219 h->got.offset |= 1;
4220 }
4221 }
4222 else
4223 unresolved_reloc = FALSE;
4224 }
4225 else
4226 {
4227 if (local_got_offsets == NULL)
4228 abort ();
4229
4230 off = local_got_offsets[r_symndx];
4231
4232 /* The offset must always be a multiple of 4. We use
4233 the least significant bit to record whether we have
4234 already generated the necessary reloc. */
4235 if ((off & 1) != 0)
4236 off &= ~1;
4237 else
4238 {
4239 bfd_put_32 (output_bfd, relocation,
4240 htab->elf.sgot->contents + off);
4241
4242 if (bfd_link_pic (info))
4243 {
4244 asection *s;
4245 Elf_Internal_Rela outrel;
4246
4247 s = htab->elf.srelgot;
4248 if (s == NULL)
4249 abort ();
4250
4251 outrel.r_offset = (htab->elf.sgot->output_section->vma
4252 + htab->elf.sgot->output_offset
4253 + off);
4254 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4255 elf_append_rel (output_bfd, s, &outrel);
4256 }
4257
4258 local_got_offsets[r_symndx] |= 1;
4259 }
4260 }
4261
4262 if (off >= (bfd_vma) -2)
4263 abort ();
4264
4265 relocation = htab->elf.sgot->output_section->vma
4266 + htab->elf.sgot->output_offset + off
4267 - htab->elf.sgotplt->output_section->vma
4268 - htab->elf.sgotplt->output_offset;
4269 break;
4270
4271 case R_386_GOTOFF:
4272 /* Relocation is relative to the start of the global offset
4273 table. */
4274
4275 /* Check to make sure it isn't a protected function or data
4276 symbol for shared library since it may not be local when
4277 used as function address or with copy relocation. We also
4278 need to make sure that a symbol is referenced locally. */
4279 if (!bfd_link_executable (info) && h)
4280 {
4281 if (!h->def_regular)
4282 {
4283 const char *v;
4284
4285 switch (ELF_ST_VISIBILITY (h->other))
4286 {
4287 case STV_HIDDEN:
4288 v = _("hidden symbol");
4289 break;
4290 case STV_INTERNAL:
4291 v = _("internal symbol");
4292 break;
4293 case STV_PROTECTED:
4294 v = _("protected symbol");
4295 break;
4296 default:
4297 v = _("symbol");
4298 break;
4299 }
4300
4301 (*_bfd_error_handler)
4302 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4303 input_bfd, v, h->root.root.string);
4304 bfd_set_error (bfd_error_bad_value);
4305 return FALSE;
4306 }
4307 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4308 && (h->type == STT_FUNC
4309 || h->type == STT_OBJECT)
4310 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4311 {
4312 (*_bfd_error_handler)
4313 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4314 input_bfd,
4315 h->type == STT_FUNC ? "function" : "data",
4316 h->root.root.string);
4317 bfd_set_error (bfd_error_bad_value);
4318 return FALSE;
4319 }
4320 }
4321
4322 /* Note that sgot is not involved in this
4323 calculation. We always want the start of .got.plt. If we
4324 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4325 permitted by the ABI, we might have to change this
4326 calculation. */
4327 relocation -= htab->elf.sgotplt->output_section->vma
4328 + htab->elf.sgotplt->output_offset;
4329 break;
4330
4331 case R_386_GOTPC:
4332 /* Use global offset table as symbol value. */
4333 relocation = htab->elf.sgotplt->output_section->vma
4334 + htab->elf.sgotplt->output_offset;
4335 unresolved_reloc = FALSE;
4336 break;
4337
4338 case R_386_PLT32:
4339 /* Relocation is to the entry for this symbol in the
4340 procedure linkage table. */
4341
4342 /* Resolve a PLT32 reloc against a local symbol directly,
4343 without using the procedure linkage table. */
4344 if (h == NULL)
4345 break;
4346
4347 if ((h->plt.offset == (bfd_vma) -1
4348 && eh->plt_got.offset == (bfd_vma) -1)
4349 || htab->elf.splt == NULL)
4350 {
4351 /* We didn't make a PLT entry for this symbol. This
4352 happens when statically linking PIC code, or when
4353 using -Bsymbolic. */
4354 break;
4355 }
4356
4357 if (h->plt.offset != (bfd_vma) -1)
4358 {
4359 resolved_plt = htab->elf.splt;
4360 plt_offset = h->plt.offset;
4361 }
4362 else
4363 {
4364 resolved_plt = htab->plt_got;
4365 plt_offset = eh->plt_got.offset;
4366 }
4367
4368 relocation = (resolved_plt->output_section->vma
4369 + resolved_plt->output_offset
4370 + plt_offset);
4371 unresolved_reloc = FALSE;
4372 break;
4373
4374 case R_386_SIZE32:
4375 /* Set to symbol size. */
4376 relocation = st_size;
4377 /* Fall through. */
4378
4379 case R_386_32:
4380 case R_386_PC32:
4381 if ((input_section->flags & SEC_ALLOC) == 0
4382 || is_vxworks_tls)
4383 break;
4384
4385 /* Copy dynamic function pointer relocations. Don't generate
4386 dynamic relocations against resolved undefined weak symbols
4387 in PIE, except for R_386_PC32. */
4388 if ((bfd_link_pic (info)
4389 && (h == NULL
4390 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4391 && (!resolved_to_zero
4392 || r_type == R_386_PC32))
4393 || h->root.type != bfd_link_hash_undefweak))
4394 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4395 || !SYMBOL_CALLS_LOCAL (info, h)))
4396 || (ELIMINATE_COPY_RELOCS
4397 && !bfd_link_pic (info)
4398 && h != NULL
4399 && h->dynindx != -1
4400 && (!h->non_got_ref
4401 || eh->func_pointer_refcount > 0
4402 || (h->root.type == bfd_link_hash_undefweak
4403 && !resolved_to_zero))
4404 && ((h->def_dynamic && !h->def_regular)
4405 /* Undefined weak symbol is bound locally when
4406 PIC is false. */
4407 || h->root.type == bfd_link_hash_undefweak)))
4408 {
4409 Elf_Internal_Rela outrel;
4410 bfd_boolean skip, relocate;
4411 asection *sreloc;
4412
4413 /* When generating a shared object, these relocations
4414 are copied into the output file to be resolved at run
4415 time. */
4416
4417 skip = FALSE;
4418 relocate = FALSE;
4419
4420 outrel.r_offset =
4421 _bfd_elf_section_offset (output_bfd, info, input_section,
4422 rel->r_offset);
4423 if (outrel.r_offset == (bfd_vma) -1)
4424 skip = TRUE;
4425 else if (outrel.r_offset == (bfd_vma) -2)
4426 skip = TRUE, relocate = TRUE;
4427 outrel.r_offset += (input_section->output_section->vma
4428 + input_section->output_offset);
4429
4430 if (skip)
4431 memset (&outrel, 0, sizeof outrel);
4432 else if (h != NULL
4433 && h->dynindx != -1
4434 && (r_type == R_386_PC32
4435 || !(bfd_link_executable (info)
4436 || SYMBOLIC_BIND (info, h))
4437 || !h->def_regular))
4438 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4439 else
4440 {
4441 /* This symbol is local, or marked to become local. */
4442 relocate = TRUE;
4443 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4444 }
4445
4446 sreloc = elf_section_data (input_section)->sreloc;
4447
4448 if (sreloc == NULL || sreloc->contents == NULL)
4449 {
4450 r = bfd_reloc_notsupported;
4451 goto check_relocation_error;
4452 }
4453
4454 elf_append_rel (output_bfd, sreloc, &outrel);
4455
4456 /* If this reloc is against an external symbol, we do
4457 not want to fiddle with the addend. Otherwise, we
4458 need to include the symbol value so that it becomes
4459 an addend for the dynamic reloc. */
4460 if (! relocate)
4461 continue;
4462 }
4463 break;
4464
4465 case R_386_TLS_IE:
4466 if (!bfd_link_executable (info))
4467 {
4468 Elf_Internal_Rela outrel;
4469 asection *sreloc;
4470
4471 outrel.r_offset = rel->r_offset
4472 + input_section->output_section->vma
4473 + input_section->output_offset;
4474 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4475 sreloc = elf_section_data (input_section)->sreloc;
4476 if (sreloc == NULL)
4477 abort ();
4478 elf_append_rel (output_bfd, sreloc, &outrel);
4479 }
4480 /* Fall through */
4481
4482 case R_386_TLS_GD:
4483 case R_386_TLS_GOTDESC:
4484 case R_386_TLS_DESC_CALL:
4485 case R_386_TLS_IE_32:
4486 case R_386_TLS_GOTIE:
4487 tls_type = GOT_UNKNOWN;
4488 if (h == NULL && local_got_offsets)
4489 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4490 else if (h != NULL)
4491 tls_type = elf_i386_hash_entry(h)->tls_type;
4492 if (tls_type == GOT_TLS_IE)
4493 tls_type = GOT_TLS_IE_NEG;
4494
4495 if (! elf_i386_tls_transition (info, input_bfd,
4496 input_section, contents,
4497 symtab_hdr, sym_hashes,
4498 &r_type, tls_type, rel,
4499 relend, h, r_symndx))
4500 return FALSE;
4501
4502 if (r_type == R_386_TLS_LE_32)
4503 {
4504 BFD_ASSERT (! unresolved_reloc);
4505 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4506 {
4507 unsigned int type;
4508 bfd_vma roff;
4509
4510 /* GD->LE transition. */
4511 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4512 if (type == 0x04)
4513 {
4514 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4515 Change it into:
4516 movl %gs:0, %eax; subl $foo@tpoff, %eax
4517 (6 byte form of subl). */
4518 memcpy (contents + rel->r_offset - 3,
4519 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4520 roff = rel->r_offset + 5;
4521 }
4522 else
4523 {
4524 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4525 Change it into:
4526 movl %gs:0, %eax; subl $foo@tpoff, %eax
4527 (6 byte form of subl). */
4528 memcpy (contents + rel->r_offset - 2,
4529 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4530 roff = rel->r_offset + 6;
4531 }
4532 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4533 contents + roff);
4534 /* Skip R_386_PC32/R_386_PLT32. */
4535 rel++;
4536 wrel++;
4537 continue;
4538 }
4539 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4540 {
4541 /* GDesc -> LE transition.
4542 It's originally something like:
4543 leal x@tlsdesc(%ebx), %eax
4544
4545 leal x@ntpoff, %eax
4546
4547 Registers other than %eax may be set up here. */
4548
4549 unsigned int val;
4550 bfd_vma roff;
4551
4552 roff = rel->r_offset;
4553 val = bfd_get_8 (input_bfd, contents + roff - 1);
4554
4555 /* Now modify the instruction as appropriate. */
4556 /* aoliva FIXME: remove the above and xor the byte
4557 below with 0x86. */
4558 bfd_put_8 (output_bfd, val ^ 0x86,
4559 contents + roff - 1);
4560 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4561 contents + roff);
4562 continue;
4563 }
4564 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4565 {
4566 /* GDesc -> LE transition.
4567 It's originally:
4568 call *(%eax)
4569 Turn it into:
4570 xchg %ax,%ax */
4571
4572 bfd_vma roff;
4573
4574 roff = rel->r_offset;
4575 bfd_put_8 (output_bfd, 0x66, contents + roff);
4576 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4577 continue;
4578 }
4579 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4580 {
4581 unsigned int val;
4582
4583 /* IE->LE transition:
4584 Originally it can be one of:
4585 movl foo, %eax
4586 movl foo, %reg
4587 addl foo, %reg
4588 We change it into:
4589 movl $foo, %eax
4590 movl $foo, %reg
4591 addl $foo, %reg. */
4592 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4593 if (val == 0xa1)
4594 {
4595 /* movl foo, %eax. */
4596 bfd_put_8 (output_bfd, 0xb8,
4597 contents + rel->r_offset - 1);
4598 }
4599 else
4600 {
4601 unsigned int type;
4602
4603 type = bfd_get_8 (input_bfd,
4604 contents + rel->r_offset - 2);
4605 switch (type)
4606 {
4607 case 0x8b:
4608 /* movl */
4609 bfd_put_8 (output_bfd, 0xc7,
4610 contents + rel->r_offset - 2);
4611 bfd_put_8 (output_bfd,
4612 0xc0 | ((val >> 3) & 7),
4613 contents + rel->r_offset - 1);
4614 break;
4615 case 0x03:
4616 /* addl */
4617 bfd_put_8 (output_bfd, 0x81,
4618 contents + rel->r_offset - 2);
4619 bfd_put_8 (output_bfd,
4620 0xc0 | ((val >> 3) & 7),
4621 contents + rel->r_offset - 1);
4622 break;
4623 default:
4624 BFD_FAIL ();
4625 break;
4626 }
4627 }
4628 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4629 contents + rel->r_offset);
4630 continue;
4631 }
4632 else
4633 {
4634 unsigned int val, type;
4635
4636 /* {IE_32,GOTIE}->LE transition:
4637 Originally it can be one of:
4638 subl foo(%reg1), %reg2
4639 movl foo(%reg1), %reg2
4640 addl foo(%reg1), %reg2
4641 We change it into:
4642 subl $foo, %reg2
4643 movl $foo, %reg2 (6 byte form)
4644 addl $foo, %reg2. */
4645 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4646 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4647 if (type == 0x8b)
4648 {
4649 /* movl */
4650 bfd_put_8 (output_bfd, 0xc7,
4651 contents + rel->r_offset - 2);
4652 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4653 contents + rel->r_offset - 1);
4654 }
4655 else if (type == 0x2b)
4656 {
4657 /* subl */
4658 bfd_put_8 (output_bfd, 0x81,
4659 contents + rel->r_offset - 2);
4660 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4661 contents + rel->r_offset - 1);
4662 }
4663 else if (type == 0x03)
4664 {
4665 /* addl */
4666 bfd_put_8 (output_bfd, 0x81,
4667 contents + rel->r_offset - 2);
4668 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4669 contents + rel->r_offset - 1);
4670 }
4671 else
4672 BFD_FAIL ();
4673 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4674 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4675 contents + rel->r_offset);
4676 else
4677 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4678 contents + rel->r_offset);
4679 continue;
4680 }
4681 }
4682
4683 if (htab->elf.sgot == NULL)
4684 abort ();
4685
4686 if (h != NULL)
4687 {
4688 off = h->got.offset;
4689 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4690 }
4691 else
4692 {
4693 if (local_got_offsets == NULL)
4694 abort ();
4695
4696 off = local_got_offsets[r_symndx];
4697 offplt = local_tlsdesc_gotents[r_symndx];
4698 }
4699
4700 if ((off & 1) != 0)
4701 off &= ~1;
4702 else
4703 {
4704 Elf_Internal_Rela outrel;
4705 int dr_type;
4706 asection *sreloc;
4707
4708 if (htab->elf.srelgot == NULL)
4709 abort ();
4710
4711 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4712
4713 if (GOT_TLS_GDESC_P (tls_type))
4714 {
4715 bfd_byte *loc;
4716 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4717 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4718 <= htab->elf.sgotplt->size);
4719 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4720 + htab->elf.sgotplt->output_offset
4721 + offplt
4722 + htab->sgotplt_jump_table_size);
4723 sreloc = htab->elf.srelplt;
4724 loc = sreloc->contents;
4725 loc += (htab->next_tls_desc_index++
4726 * sizeof (Elf32_External_Rel));
4727 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4728 <= sreloc->contents + sreloc->size);
4729 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4730 if (indx == 0)
4731 {
4732 BFD_ASSERT (! unresolved_reloc);
4733 bfd_put_32 (output_bfd,
4734 relocation - elf_i386_dtpoff_base (info),
4735 htab->elf.sgotplt->contents + offplt
4736 + htab->sgotplt_jump_table_size + 4);
4737 }
4738 else
4739 {
4740 bfd_put_32 (output_bfd, 0,
4741 htab->elf.sgotplt->contents + offplt
4742 + htab->sgotplt_jump_table_size + 4);
4743 }
4744 }
4745
4746 sreloc = htab->elf.srelgot;
4747
4748 outrel.r_offset = (htab->elf.sgot->output_section->vma
4749 + htab->elf.sgot->output_offset + off);
4750
4751 if (GOT_TLS_GD_P (tls_type))
4752 dr_type = R_386_TLS_DTPMOD32;
4753 else if (GOT_TLS_GDESC_P (tls_type))
4754 goto dr_done;
4755 else if (tls_type == GOT_TLS_IE_POS)
4756 dr_type = R_386_TLS_TPOFF;
4757 else
4758 dr_type = R_386_TLS_TPOFF32;
4759
4760 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4761 bfd_put_32 (output_bfd,
4762 relocation - elf_i386_dtpoff_base (info),
4763 htab->elf.sgot->contents + off);
4764 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4765 bfd_put_32 (output_bfd,
4766 elf_i386_dtpoff_base (info) - relocation,
4767 htab->elf.sgot->contents + off);
4768 else if (dr_type != R_386_TLS_DESC)
4769 bfd_put_32 (output_bfd, 0,
4770 htab->elf.sgot->contents + off);
4771 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4772
4773 elf_append_rel (output_bfd, sreloc, &outrel);
4774
4775 if (GOT_TLS_GD_P (tls_type))
4776 {
4777 if (indx == 0)
4778 {
4779 BFD_ASSERT (! unresolved_reloc);
4780 bfd_put_32 (output_bfd,
4781 relocation - elf_i386_dtpoff_base (info),
4782 htab->elf.sgot->contents + off + 4);
4783 }
4784 else
4785 {
4786 bfd_put_32 (output_bfd, 0,
4787 htab->elf.sgot->contents + off + 4);
4788 outrel.r_info = ELF32_R_INFO (indx,
4789 R_386_TLS_DTPOFF32);
4790 outrel.r_offset += 4;
4791 elf_append_rel (output_bfd, sreloc, &outrel);
4792 }
4793 }
4794 else if (tls_type == GOT_TLS_IE_BOTH)
4795 {
4796 bfd_put_32 (output_bfd,
4797 (indx == 0
4798 ? relocation - elf_i386_dtpoff_base (info)
4799 : 0),
4800 htab->elf.sgot->contents + off + 4);
4801 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4802 outrel.r_offset += 4;
4803 elf_append_rel (output_bfd, sreloc, &outrel);
4804 }
4805
4806 dr_done:
4807 if (h != NULL)
4808 h->got.offset |= 1;
4809 else
4810 local_got_offsets[r_symndx] |= 1;
4811 }
4812
4813 if (off >= (bfd_vma) -2
4814 && ! GOT_TLS_GDESC_P (tls_type))
4815 abort ();
4816 if (r_type == R_386_TLS_GOTDESC
4817 || r_type == R_386_TLS_DESC_CALL)
4818 {
4819 relocation = htab->sgotplt_jump_table_size + offplt;
4820 unresolved_reloc = FALSE;
4821 }
4822 else if (r_type == ELF32_R_TYPE (rel->r_info))
4823 {
4824 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4825 + htab->elf.sgotplt->output_offset;
4826 relocation = htab->elf.sgot->output_section->vma
4827 + htab->elf.sgot->output_offset + off - g_o_t;
4828 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4829 && tls_type == GOT_TLS_IE_BOTH)
4830 relocation += 4;
4831 if (r_type == R_386_TLS_IE)
4832 relocation += g_o_t;
4833 unresolved_reloc = FALSE;
4834 }
4835 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4836 {
4837 unsigned int val, type;
4838 bfd_vma roff;
4839
4840 /* GD->IE transition. */
4841 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4842 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4843 if (type == 0x04)
4844 {
4845 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4846 Change it into:
4847 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4848 val >>= 3;
4849 roff = rel->r_offset - 3;
4850 }
4851 else
4852 {
4853 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4854 Change it into:
4855 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4856 roff = rel->r_offset - 2;
4857 }
4858 memcpy (contents + roff,
4859 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4860 contents[roff + 7] = 0x80 | (val & 7);
4861 /* If foo is used only with foo@gotntpoff(%reg) and
4862 foo@indntpoff, but not with foo@gottpoff(%reg), change
4863 subl $foo@gottpoff(%reg), %eax
4864 into:
4865 addl $foo@gotntpoff(%reg), %eax. */
4866 if (tls_type == GOT_TLS_IE_POS)
4867 contents[roff + 6] = 0x03;
4868 bfd_put_32 (output_bfd,
4869 htab->elf.sgot->output_section->vma
4870 + htab->elf.sgot->output_offset + off
4871 - htab->elf.sgotplt->output_section->vma
4872 - htab->elf.sgotplt->output_offset,
4873 contents + roff + 8);
4874 /* Skip R_386_PLT32. */
4875 rel++;
4876 wrel++;
4877 continue;
4878 }
4879 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4880 {
4881 /* GDesc -> IE transition.
4882 It's originally something like:
4883 leal x@tlsdesc(%ebx), %eax
4884
4885 Change it to:
4886 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4887 or:
4888 movl x@gottpoff(%ebx), %eax # before negl %eax
4889
4890 Registers other than %eax may be set up here. */
4891
4892 bfd_vma roff;
4893
4894 /* First, make sure it's a leal adding ebx to a 32-bit
4895 offset into any register, although it's probably
4896 almost always going to be eax. */
4897 roff = rel->r_offset;
4898
4899 /* Now modify the instruction as appropriate. */
4900 /* To turn a leal into a movl in the form we use it, it
4901 suffices to change the first byte from 0x8d to 0x8b.
4902 aoliva FIXME: should we decide to keep the leal, all
4903 we have to do is remove the statement below, and
4904 adjust the relaxation of R_386_TLS_DESC_CALL. */
4905 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4906
4907 if (tls_type == GOT_TLS_IE_BOTH)
4908 off += 4;
4909
4910 bfd_put_32 (output_bfd,
4911 htab->elf.sgot->output_section->vma
4912 + htab->elf.sgot->output_offset + off
4913 - htab->elf.sgotplt->output_section->vma
4914 - htab->elf.sgotplt->output_offset,
4915 contents + roff);
4916 continue;
4917 }
4918 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4919 {
4920 /* GDesc -> IE transition.
4921 It's originally:
4922 call *(%eax)
4923
4924 Change it to:
4925 xchg %ax,%ax
4926 or
4927 negl %eax
4928 depending on how we transformed the TLS_GOTDESC above.
4929 */
4930
4931 bfd_vma roff;
4932
4933 roff = rel->r_offset;
4934
4935 /* Now modify the instruction as appropriate. */
4936 if (tls_type != GOT_TLS_IE_NEG)
4937 {
4938 /* xchg %ax,%ax */
4939 bfd_put_8 (output_bfd, 0x66, contents + roff);
4940 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4941 }
4942 else
4943 {
4944 /* negl %eax */
4945 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4946 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4947 }
4948
4949 continue;
4950 }
4951 else
4952 BFD_ASSERT (FALSE);
4953 break;
4954
4955 case R_386_TLS_LDM:
4956 if (! elf_i386_tls_transition (info, input_bfd,
4957 input_section, contents,
4958 symtab_hdr, sym_hashes,
4959 &r_type, GOT_UNKNOWN, rel,
4960 relend, h, r_symndx))
4961 return FALSE;
4962
4963 if (r_type != R_386_TLS_LDM)
4964 {
4965 /* LD->LE transition:
4966 leal foo(%reg), %eax; call ___tls_get_addr.
4967 We change it into:
4968 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4969 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4970 memcpy (contents + rel->r_offset - 2,
4971 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4972 /* Skip R_386_PC32/R_386_PLT32. */
4973 rel++;
4974 wrel++;
4975 continue;
4976 }
4977
4978 if (htab->elf.sgot == NULL)
4979 abort ();
4980
4981 off = htab->tls_ldm_got.offset;
4982 if (off & 1)
4983 off &= ~1;
4984 else
4985 {
4986 Elf_Internal_Rela outrel;
4987
4988 if (htab->elf.srelgot == NULL)
4989 abort ();
4990
4991 outrel.r_offset = (htab->elf.sgot->output_section->vma
4992 + htab->elf.sgot->output_offset + off);
4993
4994 bfd_put_32 (output_bfd, 0,
4995 htab->elf.sgot->contents + off);
4996 bfd_put_32 (output_bfd, 0,
4997 htab->elf.sgot->contents + off + 4);
4998 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4999 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5000 htab->tls_ldm_got.offset |= 1;
5001 }
5002 relocation = htab->elf.sgot->output_section->vma
5003 + htab->elf.sgot->output_offset + off
5004 - htab->elf.sgotplt->output_section->vma
5005 - htab->elf.sgotplt->output_offset;
5006 unresolved_reloc = FALSE;
5007 break;
5008
5009 case R_386_TLS_LDO_32:
5010 if (!bfd_link_executable (info)
5011 || (input_section->flags & SEC_CODE) == 0)
5012 relocation -= elf_i386_dtpoff_base (info);
5013 else
5014 /* When converting LDO to LE, we must negate. */
5015 relocation = -elf_i386_tpoff (info, relocation);
5016 break;
5017
5018 case R_386_TLS_LE_32:
5019 case R_386_TLS_LE:
5020 if (!bfd_link_executable (info))
5021 {
5022 Elf_Internal_Rela outrel;
5023 asection *sreloc;
5024
5025 outrel.r_offset = rel->r_offset
5026 + input_section->output_section->vma
5027 + input_section->output_offset;
5028 if (h != NULL && h->dynindx != -1)
5029 indx = h->dynindx;
5030 else
5031 indx = 0;
5032 if (r_type == R_386_TLS_LE_32)
5033 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5034 else
5035 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5036 sreloc = elf_section_data (input_section)->sreloc;
5037 if (sreloc == NULL)
5038 abort ();
5039 elf_append_rel (output_bfd, sreloc, &outrel);
5040 if (indx)
5041 continue;
5042 else if (r_type == R_386_TLS_LE_32)
5043 relocation = elf_i386_dtpoff_base (info) - relocation;
5044 else
5045 relocation -= elf_i386_dtpoff_base (info);
5046 }
5047 else if (r_type == R_386_TLS_LE_32)
5048 relocation = elf_i386_tpoff (info, relocation);
5049 else
5050 relocation = -elf_i386_tpoff (info, relocation);
5051 break;
5052
5053 default:
5054 break;
5055 }
5056
5057 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5058 because such sections are not SEC_ALLOC and thus ld.so will
5059 not process them. */
5060 if (unresolved_reloc
5061 && !((input_section->flags & SEC_DEBUGGING) != 0
5062 && h->def_dynamic)
5063 && _bfd_elf_section_offset (output_bfd, info, input_section,
5064 rel->r_offset) != (bfd_vma) -1)
5065 {
5066 (*_bfd_error_handler)
5067 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5068 input_bfd,
5069 input_section,
5070 (long) rel->r_offset,
5071 howto->name,
5072 h->root.root.string);
5073 return FALSE;
5074 }
5075
5076 do_relocation:
5077 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5078 contents, rel->r_offset,
5079 relocation, 0);
5080
5081 check_relocation_error:
5082 if (r != bfd_reloc_ok)
5083 {
5084 const char *name;
5085
5086 if (h != NULL)
5087 name = h->root.root.string;
5088 else
5089 {
5090 name = bfd_elf_string_from_elf_section (input_bfd,
5091 symtab_hdr->sh_link,
5092 sym->st_name);
5093 if (name == NULL)
5094 return FALSE;
5095 if (*name == '\0')
5096 name = bfd_section_name (input_bfd, sec);
5097 }
5098
5099 if (r == bfd_reloc_overflow)
5100 {
5101 if (! ((*info->callbacks->reloc_overflow)
5102 (info, (h ? &h->root : NULL), name, howto->name,
5103 (bfd_vma) 0, input_bfd, input_section,
5104 rel->r_offset)))
5105 return FALSE;
5106 }
5107 else
5108 {
5109 (*_bfd_error_handler)
5110 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5111 input_bfd, input_section,
5112 (long) rel->r_offset, name, (int) r);
5113 return FALSE;
5114 }
5115 }
5116
5117 if (wrel != rel)
5118 *wrel = *rel;
5119 }
5120
5121 if (wrel != rel)
5122 {
5123 Elf_Internal_Shdr *rel_hdr;
5124 size_t deleted = rel - wrel;
5125
5126 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5127 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5128 if (rel_hdr->sh_size == 0)
5129 {
5130 /* It is too late to remove an empty reloc section. Leave
5131 one NONE reloc.
5132 ??? What is wrong with an empty section??? */
5133 rel_hdr->sh_size = rel_hdr->sh_entsize;
5134 deleted -= 1;
5135 }
5136 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5137 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5138 input_section->reloc_count -= deleted;
5139 }
5140
5141 return TRUE;
5142 }
5143
5144 /* Finish up dynamic symbol handling. We set the contents of various
5145 dynamic sections here. */
5146
5147 static bfd_boolean
5148 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5149 struct bfd_link_info *info,
5150 struct elf_link_hash_entry *h,
5151 Elf_Internal_Sym *sym)
5152 {
5153 struct elf_i386_link_hash_table *htab;
5154 unsigned plt_entry_size;
5155 const struct elf_i386_backend_data *abed;
5156 struct elf_i386_link_hash_entry *eh;
5157 bfd_boolean local_undefweak;
5158
5159 htab = elf_i386_hash_table (info);
5160 if (htab == NULL)
5161 return FALSE;
5162
5163 abed = get_elf_i386_backend_data (output_bfd);
5164 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5165
5166 eh = (struct elf_i386_link_hash_entry *) h;
5167
5168 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5169 resolved undefined weak symbols in executable so that their
5170 references have value 0 at run-time. */
5171 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
5172
5173 if (h->plt.offset != (bfd_vma) -1)
5174 {
5175 bfd_vma plt_index;
5176 bfd_vma got_offset;
5177 Elf_Internal_Rela rel;
5178 bfd_byte *loc;
5179 asection *plt, *gotplt, *relplt;
5180
5181 /* When building a static executable, use .iplt, .igot.plt and
5182 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5183 if (htab->elf.splt != NULL)
5184 {
5185 plt = htab->elf.splt;
5186 gotplt = htab->elf.sgotplt;
5187 relplt = htab->elf.srelplt;
5188 }
5189 else
5190 {
5191 plt = htab->elf.iplt;
5192 gotplt = htab->elf.igotplt;
5193 relplt = htab->elf.irelplt;
5194 }
5195
5196 /* This symbol has an entry in the procedure linkage table. Set
5197 it up. */
5198
5199 if ((h->dynindx == -1
5200 && !local_undefweak
5201 && !((h->forced_local || bfd_link_executable (info))
5202 && h->def_regular
5203 && h->type == STT_GNU_IFUNC))
5204 || plt == NULL
5205 || gotplt == NULL
5206 || relplt == NULL)
5207 abort ();
5208
5209 /* Get the index in the procedure linkage table which
5210 corresponds to this symbol. This is the index of this symbol
5211 in all the symbols for which we are making plt entries. The
5212 first entry in the procedure linkage table is reserved.
5213
5214 Get the offset into the .got table of the entry that
5215 corresponds to this function. Each .got entry is 4 bytes.
5216 The first three are reserved.
5217
5218 For static executables, we don't reserve anything. */
5219
5220 if (plt == htab->elf.splt)
5221 {
5222 got_offset = h->plt.offset / plt_entry_size - 1;
5223 got_offset = (got_offset + 3) * 4;
5224 }
5225 else
5226 {
5227 got_offset = h->plt.offset / plt_entry_size;
5228 got_offset = got_offset * 4;
5229 }
5230
5231 /* Fill in the entry in the procedure linkage table. */
5232 if (! bfd_link_pic (info))
5233 {
5234 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5235 abed->plt->plt_entry_size);
5236 bfd_put_32 (output_bfd,
5237 (gotplt->output_section->vma
5238 + gotplt->output_offset
5239 + got_offset),
5240 plt->contents + h->plt.offset
5241 + abed->plt->plt_got_offset);
5242
5243 if (abed->is_vxworks)
5244 {
5245 int s, k, reloc_index;
5246
5247 /* Create the R_386_32 relocation referencing the GOT
5248 for this PLT entry. */
5249
5250 /* S: Current slot number (zero-based). */
5251 s = ((h->plt.offset - abed->plt->plt_entry_size)
5252 / abed->plt->plt_entry_size);
5253 /* K: Number of relocations for PLTResolve. */
5254 if (bfd_link_pic (info))
5255 k = PLTRESOLVE_RELOCS_SHLIB;
5256 else
5257 k = PLTRESOLVE_RELOCS;
5258 /* Skip the PLTresolve relocations, and the relocations for
5259 the other PLT slots. */
5260 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5261 loc = (htab->srelplt2->contents + reloc_index
5262 * sizeof (Elf32_External_Rel));
5263
5264 rel.r_offset = (htab->elf.splt->output_section->vma
5265 + htab->elf.splt->output_offset
5266 + h->plt.offset + 2),
5267 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5268 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5269
5270 /* Create the R_386_32 relocation referencing the beginning of
5271 the PLT for this GOT entry. */
5272 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5273 + htab->elf.sgotplt->output_offset
5274 + got_offset);
5275 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5276 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5277 loc + sizeof (Elf32_External_Rel));
5278 }
5279 }
5280 else
5281 {
5282 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5283 abed->plt->plt_entry_size);
5284 bfd_put_32 (output_bfd, got_offset,
5285 plt->contents + h->plt.offset
5286 + abed->plt->plt_got_offset);
5287 }
5288
5289 /* Fill in the entry in the global offset table. Leave the entry
5290 as zero for undefined weak symbol in PIE. No PLT relocation
5291 against undefined weak symbol in PIE. */
5292 if (!local_undefweak)
5293 {
5294 bfd_put_32 (output_bfd,
5295 (plt->output_section->vma
5296 + plt->output_offset
5297 + h->plt.offset
5298 + abed->plt->plt_lazy_offset),
5299 gotplt->contents + got_offset);
5300
5301 /* Fill in the entry in the .rel.plt section. */
5302 rel.r_offset = (gotplt->output_section->vma
5303 + gotplt->output_offset
5304 + got_offset);
5305 if (h->dynindx == -1
5306 || ((bfd_link_executable (info)
5307 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5308 && h->def_regular
5309 && h->type == STT_GNU_IFUNC))
5310 {
5311 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5312 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5313 in the .got.plt section. */
5314 bfd_put_32 (output_bfd,
5315 (h->root.u.def.value
5316 + h->root.u.def.section->output_section->vma
5317 + h->root.u.def.section->output_offset),
5318 gotplt->contents + got_offset);
5319 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5320 /* R_386_IRELATIVE comes last. */
5321 plt_index = htab->next_irelative_index--;
5322 }
5323 else
5324 {
5325 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5326 plt_index = htab->next_jump_slot_index++;
5327 }
5328
5329 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5330 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5331
5332 /* Don't fill PLT entry for static executables. */
5333 if (plt == htab->elf.splt)
5334 {
5335 bfd_put_32 (output_bfd,
5336 plt_index * sizeof (Elf32_External_Rel),
5337 plt->contents + h->plt.offset
5338 + abed->plt->plt_reloc_offset);
5339 bfd_put_32 (output_bfd, - (h->plt.offset
5340 + abed->plt->plt_plt_offset + 4),
5341 plt->contents + h->plt.offset
5342 + abed->plt->plt_plt_offset);
5343 }
5344 }
5345 }
5346 else if (eh->plt_got.offset != (bfd_vma) -1)
5347 {
5348 bfd_vma got_offset, plt_offset;
5349 asection *plt, *got, *gotplt;
5350 const bfd_byte *got_plt_entry;
5351
5352 /* Offset of displacement of the indirect jump. */
5353 bfd_vma plt_got_offset = 2;
5354
5355 /* Set the entry in the GOT procedure linkage table. */
5356 plt = htab->plt_got;
5357 got = htab->elf.sgot;
5358 gotplt = htab->elf.sgotplt;
5359 got_offset = h->got.offset;
5360
5361 if (got_offset == (bfd_vma) -1
5362 || plt == NULL
5363 || got == NULL
5364 || gotplt == NULL)
5365 abort ();
5366
5367 /* Fill in the entry in the GOT procedure linkage table. */
5368 if (! bfd_link_pic (info))
5369 {
5370 got_plt_entry = elf_i386_got_plt_entry;
5371 got_offset += got->output_section->vma + got->output_offset;
5372 }
5373 else
5374 {
5375 got_plt_entry = elf_i386_pic_got_plt_entry;
5376 got_offset += (got->output_section->vma
5377 + got->output_offset
5378 - gotplt->output_section->vma
5379 - gotplt->output_offset);
5380 }
5381
5382 plt_offset = eh->plt_got.offset;
5383 memcpy (plt->contents + plt_offset, got_plt_entry,
5384 sizeof (elf_i386_got_plt_entry));
5385 bfd_put_32 (output_bfd, got_offset,
5386 plt->contents + plt_offset + plt_got_offset);
5387 }
5388
5389 if (!local_undefweak
5390 && !h->def_regular
5391 && (h->plt.offset != (bfd_vma) -1
5392 || eh->plt_got.offset != (bfd_vma) -1))
5393 {
5394 /* Mark the symbol as undefined, rather than as defined in
5395 the .plt section. Leave the value if there were any
5396 relocations where pointer equality matters (this is a clue
5397 for the dynamic linker, to make function pointer
5398 comparisons work between an application and shared
5399 library), otherwise set it to zero. If a function is only
5400 called from a binary, there is no need to slow down
5401 shared libraries because of that. */
5402 sym->st_shndx = SHN_UNDEF;
5403 if (!h->pointer_equality_needed)
5404 sym->st_value = 0;
5405 }
5406
5407 /* Don't generate dynamic GOT relocation against undefined weak
5408 symbol in executable. */
5409 if (h->got.offset != (bfd_vma) -1
5410 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5411 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5412 && !local_undefweak)
5413 {
5414 Elf_Internal_Rela rel;
5415
5416 /* This symbol has an entry in the global offset table. Set it
5417 up. */
5418
5419 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5420 abort ();
5421
5422 rel.r_offset = (htab->elf.sgot->output_section->vma
5423 + htab->elf.sgot->output_offset
5424 + (h->got.offset & ~(bfd_vma) 1));
5425
5426 /* If this is a static link, or it is a -Bsymbolic link and the
5427 symbol is defined locally or was forced to be local because
5428 of a version file, we just want to emit a RELATIVE reloc.
5429 The entry in the global offset table will already have been
5430 initialized in the relocate_section function. */
5431 if (h->def_regular
5432 && h->type == STT_GNU_IFUNC)
5433 {
5434 if (bfd_link_pic (info))
5435 {
5436 /* Generate R_386_GLOB_DAT. */
5437 goto do_glob_dat;
5438 }
5439 else
5440 {
5441 asection *plt;
5442
5443 if (!h->pointer_equality_needed)
5444 abort ();
5445
5446 /* For non-shared object, we can't use .got.plt, which
5447 contains the real function addres if we need pointer
5448 equality. We load the GOT entry with the PLT entry. */
5449 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5450 bfd_put_32 (output_bfd,
5451 (plt->output_section->vma
5452 + plt->output_offset + h->plt.offset),
5453 htab->elf.sgot->contents + h->got.offset);
5454 return TRUE;
5455 }
5456 }
5457 else if (bfd_link_pic (info)
5458 && SYMBOL_REFERENCES_LOCAL (info, h))
5459 {
5460 BFD_ASSERT((h->got.offset & 1) != 0);
5461 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5462 }
5463 else
5464 {
5465 BFD_ASSERT((h->got.offset & 1) == 0);
5466 do_glob_dat:
5467 bfd_put_32 (output_bfd, (bfd_vma) 0,
5468 htab->elf.sgot->contents + h->got.offset);
5469 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5470 }
5471
5472 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5473 }
5474
5475 if (h->needs_copy)
5476 {
5477 Elf_Internal_Rela rel;
5478
5479 /* This symbol needs a copy reloc. Set it up. */
5480
5481 if (h->dynindx == -1
5482 || (h->root.type != bfd_link_hash_defined
5483 && h->root.type != bfd_link_hash_defweak)
5484 || htab->srelbss == NULL)
5485 abort ();
5486
5487 rel.r_offset = (h->root.u.def.value
5488 + h->root.u.def.section->output_section->vma
5489 + h->root.u.def.section->output_offset);
5490 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5491 elf_append_rel (output_bfd, htab->srelbss, &rel);
5492 }
5493
5494 return TRUE;
5495 }
5496
5497 /* Finish up local dynamic symbol handling. We set the contents of
5498 various dynamic sections here. */
5499
5500 static bfd_boolean
5501 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5502 {
5503 struct elf_link_hash_entry *h
5504 = (struct elf_link_hash_entry *) *slot;
5505 struct bfd_link_info *info
5506 = (struct bfd_link_info *) inf;
5507
5508 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5509 h, NULL);
5510 }
5511
5512 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5513 here since undefined weak symbol may not be dynamic and may not be
5514 called for elf_i386_finish_dynamic_symbol. */
5515
5516 static bfd_boolean
5517 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5518 void *inf)
5519 {
5520 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5521 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5522
5523 if (h->root.type != bfd_link_hash_undefweak
5524 || h->dynindx != -1)
5525 return TRUE;
5526
5527 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5528 info, h, NULL);
5529 }
5530
5531 /* Used to decide how to sort relocs in an optimal manner for the
5532 dynamic linker, before writing them out. */
5533
5534 static enum elf_reloc_type_class
5535 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5536 const asection *rel_sec ATTRIBUTE_UNUSED,
5537 const Elf_Internal_Rela *rela)
5538 {
5539 bfd *abfd = info->output_bfd;
5540 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5541 struct elf_link_hash_table *htab = elf_hash_table (info);
5542
5543 if (htab->dynsym != NULL
5544 && htab->dynsym->contents != NULL)
5545 {
5546 /* Check relocation against STT_GNU_IFUNC symbol if there are
5547 dynamic symbols. */
5548 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5549 Elf_Internal_Sym sym;
5550 if (!bed->s->swap_symbol_in (abfd,
5551 (htab->dynsym->contents
5552 + r_symndx * sizeof (Elf32_External_Sym)),
5553 0, &sym))
5554 abort ();
5555
5556 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5557 return reloc_class_ifunc;
5558 }
5559
5560 switch (ELF32_R_TYPE (rela->r_info))
5561 {
5562 case R_386_RELATIVE:
5563 return reloc_class_relative;
5564 case R_386_JUMP_SLOT:
5565 return reloc_class_plt;
5566 case R_386_COPY:
5567 return reloc_class_copy;
5568 default:
5569 return reloc_class_normal;
5570 }
5571 }
5572
5573 /* Finish up the dynamic sections. */
5574
5575 static bfd_boolean
5576 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5577 struct bfd_link_info *info)
5578 {
5579 struct elf_i386_link_hash_table *htab;
5580 bfd *dynobj;
5581 asection *sdyn;
5582 const struct elf_i386_backend_data *abed;
5583
5584 htab = elf_i386_hash_table (info);
5585 if (htab == NULL)
5586 return FALSE;
5587
5588 dynobj = htab->elf.dynobj;
5589 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5590 abed = get_elf_i386_backend_data (output_bfd);
5591
5592 if (htab->elf.dynamic_sections_created)
5593 {
5594 Elf32_External_Dyn *dyncon, *dynconend;
5595
5596 if (sdyn == NULL || htab->elf.sgot == NULL)
5597 abort ();
5598
5599 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5600 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5601 for (; dyncon < dynconend; dyncon++)
5602 {
5603 Elf_Internal_Dyn dyn;
5604 asection *s;
5605
5606 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5607
5608 switch (dyn.d_tag)
5609 {
5610 default:
5611 if (abed->is_vxworks
5612 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5613 break;
5614 continue;
5615
5616 case DT_PLTGOT:
5617 s = htab->elf.sgotplt;
5618 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5619 break;
5620
5621 case DT_JMPREL:
5622 s = htab->elf.srelplt;
5623 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5624 break;
5625
5626 case DT_PLTRELSZ:
5627 s = htab->elf.srelplt;
5628 dyn.d_un.d_val = s->size;
5629 break;
5630
5631 case DT_RELSZ:
5632 /* My reading of the SVR4 ABI indicates that the
5633 procedure linkage table relocs (DT_JMPREL) should be
5634 included in the overall relocs (DT_REL). This is
5635 what Solaris does. However, UnixWare can not handle
5636 that case. Therefore, we override the DT_RELSZ entry
5637 here to make it not include the JMPREL relocs. */
5638 s = htab->elf.srelplt;
5639 if (s == NULL)
5640 continue;
5641 dyn.d_un.d_val -= s->size;
5642 break;
5643
5644 case DT_REL:
5645 /* We may not be using the standard ELF linker script.
5646 If .rel.plt is the first .rel section, we adjust
5647 DT_REL to not include it. */
5648 s = htab->elf.srelplt;
5649 if (s == NULL)
5650 continue;
5651 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5652 continue;
5653 dyn.d_un.d_ptr += s->size;
5654 break;
5655 }
5656
5657 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5658 }
5659
5660 /* Fill in the first entry in the procedure linkage table. */
5661 if (htab->elf.splt && htab->elf.splt->size > 0)
5662 {
5663 if (bfd_link_pic (info))
5664 {
5665 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5666 abed->plt->plt0_entry_size);
5667 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5668 abed->plt0_pad_byte,
5669 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5670 }
5671 else
5672 {
5673 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5674 abed->plt->plt0_entry_size);
5675 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5676 abed->plt0_pad_byte,
5677 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5678 bfd_put_32 (output_bfd,
5679 (htab->elf.sgotplt->output_section->vma
5680 + htab->elf.sgotplt->output_offset
5681 + 4),
5682 htab->elf.splt->contents
5683 + abed->plt->plt0_got1_offset);
5684 bfd_put_32 (output_bfd,
5685 (htab->elf.sgotplt->output_section->vma
5686 + htab->elf.sgotplt->output_offset
5687 + 8),
5688 htab->elf.splt->contents
5689 + abed->plt->plt0_got2_offset);
5690
5691 if (abed->is_vxworks)
5692 {
5693 Elf_Internal_Rela rel;
5694
5695 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5696 On IA32 we use REL relocations so the addend goes in
5697 the PLT directly. */
5698 rel.r_offset = (htab->elf.splt->output_section->vma
5699 + htab->elf.splt->output_offset
5700 + abed->plt->plt0_got1_offset);
5701 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5702 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5703 htab->srelplt2->contents);
5704 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5705 rel.r_offset = (htab->elf.splt->output_section->vma
5706 + htab->elf.splt->output_offset
5707 + abed->plt->plt0_got2_offset);
5708 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5709 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5710 htab->srelplt2->contents +
5711 sizeof (Elf32_External_Rel));
5712 }
5713 }
5714
5715 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5716 really seem like the right value. */
5717 elf_section_data (htab->elf.splt->output_section)
5718 ->this_hdr.sh_entsize = 4;
5719
5720 /* Correct the .rel.plt.unloaded relocations. */
5721 if (abed->is_vxworks && !bfd_link_pic (info))
5722 {
5723 int num_plts = (htab->elf.splt->size
5724 / abed->plt->plt_entry_size) - 1;
5725 unsigned char *p;
5726
5727 p = htab->srelplt2->contents;
5728 if (bfd_link_pic (info))
5729 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5730 else
5731 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5732
5733 for (; num_plts; num_plts--)
5734 {
5735 Elf_Internal_Rela rel;
5736 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5737 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5738 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5739 p += sizeof (Elf32_External_Rel);
5740
5741 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5742 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5743 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5744 p += sizeof (Elf32_External_Rel);
5745 }
5746 }
5747 }
5748 }
5749
5750 if (htab->elf.sgotplt)
5751 {
5752 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5753 {
5754 (*_bfd_error_handler)
5755 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5756 return FALSE;
5757 }
5758
5759 /* Fill in the first three entries in the global offset table. */
5760 if (htab->elf.sgotplt->size > 0)
5761 {
5762 bfd_put_32 (output_bfd,
5763 (sdyn == NULL ? 0
5764 : sdyn->output_section->vma + sdyn->output_offset),
5765 htab->elf.sgotplt->contents);
5766 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5767 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5768 }
5769
5770 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5771 }
5772
5773 /* Adjust .eh_frame for .plt section. */
5774 if (htab->plt_eh_frame != NULL
5775 && htab->plt_eh_frame->contents != NULL)
5776 {
5777 if (htab->elf.splt != NULL
5778 && htab->elf.splt->size != 0
5779 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5780 && htab->elf.splt->output_section != NULL
5781 && htab->plt_eh_frame->output_section != NULL)
5782 {
5783 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5784 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5785 + htab->plt_eh_frame->output_offset
5786 + PLT_FDE_START_OFFSET;
5787 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5788 htab->plt_eh_frame->contents
5789 + PLT_FDE_START_OFFSET);
5790 }
5791 if (htab->plt_eh_frame->sec_info_type
5792 == SEC_INFO_TYPE_EH_FRAME)
5793 {
5794 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5795 htab->plt_eh_frame,
5796 htab->plt_eh_frame->contents))
5797 return FALSE;
5798 }
5799 }
5800
5801 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5802 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5803
5804 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5805 htab_traverse (htab->loc_hash_table,
5806 elf_i386_finish_local_dynamic_symbol,
5807 info);
5808
5809 /* Fill PLT entries for undefined weak symbols in PIE. */
5810 if (bfd_link_pie (info))
5811 bfd_hash_traverse (&info->hash->table,
5812 elf_i386_pie_finish_undefweak_symbol,
5813 info);
5814
5815 return TRUE;
5816 }
5817
5818 /* Return an array of PLT entry symbol values. */
5819
5820 static bfd_vma *
5821 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5822 asection *relplt)
5823 {
5824 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5825 arelent *p;
5826 long count, i;
5827 bfd_vma *plt_sym_val;
5828 bfd_vma plt_offset;
5829 bfd_byte *plt_contents;
5830 const struct elf_i386_backend_data *bed
5831 = get_elf_i386_backend_data (abfd);
5832 Elf_Internal_Shdr *hdr;
5833
5834 /* Get the .plt section contents. */
5835 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5836 if (plt_contents == NULL)
5837 return NULL;
5838 if (!bfd_get_section_contents (abfd, (asection *) plt,
5839 plt_contents, 0, plt->size))
5840 {
5841 bad_return:
5842 free (plt_contents);
5843 return NULL;
5844 }
5845
5846 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5847 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5848 goto bad_return;
5849
5850 hdr = &elf_section_data (relplt)->this_hdr;
5851 count = relplt->size / hdr->sh_entsize;
5852
5853 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5854 if (plt_sym_val == NULL)
5855 goto bad_return;
5856
5857 for (i = 0; i < count; i++)
5858 plt_sym_val[i] = -1;
5859
5860 plt_offset = bed->plt->plt_entry_size;
5861 p = relplt->relocation;
5862 for (i = 0; i < count; i++, p++)
5863 {
5864 long reloc_index;
5865
5866 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5867 if (p->howto == NULL)
5868 continue;
5869
5870 if (p->howto->type != R_386_JUMP_SLOT
5871 && p->howto->type != R_386_IRELATIVE)
5872 continue;
5873
5874 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5875 + bed->plt->plt_reloc_offset));
5876 reloc_index /= sizeof (Elf32_External_Rel);
5877 if (reloc_index < count)
5878 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5879
5880 plt_offset += bed->plt->plt_entry_size;
5881
5882 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5883 section. */
5884 if (plt_offset >= plt->size)
5885 break;
5886 }
5887
5888 free (plt_contents);
5889
5890 return plt_sym_val;
5891 }
5892
5893 /* Similar to _bfd_elf_get_synthetic_symtab. */
5894
5895 static long
5896 elf_i386_get_synthetic_symtab (bfd *abfd,
5897 long symcount,
5898 asymbol **syms,
5899 long dynsymcount,
5900 asymbol **dynsyms,
5901 asymbol **ret)
5902 {
5903 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5904 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5905 dynsymcount, dynsyms, ret,
5906 plt,
5907 elf_i386_get_plt_sym_val);
5908 }
5909
5910 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5911
5912 static bfd_boolean
5913 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5914 {
5915 if (h->plt.offset != (bfd_vma) -1
5916 && !h->def_regular
5917 && !h->pointer_equality_needed)
5918 return FALSE;
5919
5920 return _bfd_elf_hash_symbol (h);
5921 }
5922
5923 /* Hook called by the linker routine which adds symbols from an object
5924 file. */
5925
5926 static bfd_boolean
5927 elf_i386_add_symbol_hook (bfd * abfd,
5928 struct bfd_link_info * info,
5929 Elf_Internal_Sym * sym,
5930 const char ** namep ATTRIBUTE_UNUSED,
5931 flagword * flagsp ATTRIBUTE_UNUSED,
5932 asection ** secp ATTRIBUTE_UNUSED,
5933 bfd_vma * valp ATTRIBUTE_UNUSED)
5934 {
5935 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5936 && (abfd->flags & DYNAMIC) == 0
5937 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5938 elf_tdata (info->output_bfd)->has_gnu_symbols
5939 |= elf_gnu_symbol_unique;
5940
5941 return TRUE;
5942 }
5943
5944 #define TARGET_LITTLE_SYM i386_elf32_vec
5945 #define TARGET_LITTLE_NAME "elf32-i386"
5946 #define ELF_ARCH bfd_arch_i386
5947 #define ELF_TARGET_ID I386_ELF_DATA
5948 #define ELF_MACHINE_CODE EM_386
5949 #define ELF_MAXPAGESIZE 0x1000
5950
5951 #define elf_backend_can_gc_sections 1
5952 #define elf_backend_can_refcount 1
5953 #define elf_backend_want_got_plt 1
5954 #define elf_backend_plt_readonly 1
5955 #define elf_backend_want_plt_sym 0
5956 #define elf_backend_got_header_size 12
5957 #define elf_backend_plt_alignment 4
5958 #define elf_backend_extern_protected_data 1
5959
5960 /* Support RELA for objdump of prelink objects. */
5961 #define elf_info_to_howto elf_i386_info_to_howto_rel
5962 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5963
5964 #define bfd_elf32_mkobject elf_i386_mkobject
5965
5966 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5967 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5968 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5969 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5970 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5971
5972 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5973 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5974 #define elf_backend_check_relocs elf_i386_check_relocs
5975 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5976 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5977 #define elf_backend_fake_sections elf_i386_fake_sections
5978 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5979 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5980 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5981 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5982 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5983 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5984 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5985 #define elf_backend_relocate_section elf_i386_relocate_section
5986 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5987 #define elf_backend_always_size_sections elf_i386_always_size_sections
5988 #define elf_backend_omit_section_dynsym \
5989 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5990 #define elf_backend_hash_symbol elf_i386_hash_symbol
5991 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5992 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
5993
5994 #include "elf32-target.h"
5995
5996 /* FreeBSD support. */
5997
5998 #undef TARGET_LITTLE_SYM
5999 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
6000 #undef TARGET_LITTLE_NAME
6001 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6002 #undef ELF_OSABI
6003 #define ELF_OSABI ELFOSABI_FREEBSD
6004
6005 /* The kernel recognizes executables as valid only if they carry a
6006 "FreeBSD" label in the ELF header. So we put this label on all
6007 executables and (for simplicity) also all other object files. */
6008
6009 static void
6010 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6011 {
6012 _bfd_elf_post_process_headers (abfd, info);
6013
6014 #ifdef OLD_FREEBSD_ABI_LABEL
6015 {
6016 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6017 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6018 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6019 }
6020 #endif
6021 }
6022
6023 #undef elf_backend_post_process_headers
6024 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6025 #undef elf32_bed
6026 #define elf32_bed elf32_i386_fbsd_bed
6027
6028 #undef elf_backend_add_symbol_hook
6029
6030 #include "elf32-target.h"
6031
6032 /* Solaris 2. */
6033
6034 #undef TARGET_LITTLE_SYM
6035 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6036 #undef TARGET_LITTLE_NAME
6037 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6038
6039 #undef elf_backend_post_process_headers
6040
6041 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6042 objects won't be recognized. */
6043 #undef ELF_OSABI
6044
6045 #undef elf32_bed
6046 #define elf32_bed elf32_i386_sol2_bed
6047
6048 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6049 boundary. */
6050 #undef elf_backend_static_tls_alignment
6051 #define elf_backend_static_tls_alignment 8
6052
6053 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6054
6055 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6056 File, p.63. */
6057 #undef elf_backend_want_plt_sym
6058 #define elf_backend_want_plt_sym 1
6059
6060 #include "elf32-target.h"
6061
6062 /* Intel MCU support. */
6063
6064 static bfd_boolean
6065 elf32_iamcu_elf_object_p (bfd *abfd)
6066 {
6067 /* Set the right machine number for an IAMCU elf32 file. */
6068 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6069 return TRUE;
6070 }
6071
6072 #undef TARGET_LITTLE_SYM
6073 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6074 #undef TARGET_LITTLE_NAME
6075 #define TARGET_LITTLE_NAME "elf32-iamcu"
6076 #undef ELF_ARCH
6077 #define ELF_ARCH bfd_arch_iamcu
6078
6079 #undef ELF_MACHINE_CODE
6080 #define ELF_MACHINE_CODE EM_IAMCU
6081
6082 #undef ELF_OSABI
6083
6084 #undef elf32_bed
6085 #define elf32_bed elf32_iamcu_bed
6086
6087 #undef elf_backend_object_p
6088 #define elf_backend_object_p elf32_iamcu_elf_object_p
6089
6090 #undef elf_backend_static_tls_alignment
6091
6092 #undef elf_backend_want_plt_sym
6093 #define elf_backend_want_plt_sym 0
6094
6095 #include "elf32-target.h"
6096
6097 /* Restore defaults. */
6098 #undef ELF_ARCH
6099 #define ELF_ARCH bfd_arch_i386
6100 #undef ELF_MACHINE_CODE
6101 #define ELF_MACHINE_CODE EM_386
6102
6103 /* Native Client support. */
6104
6105 #undef TARGET_LITTLE_SYM
6106 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6107 #undef TARGET_LITTLE_NAME
6108 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6109 #undef elf32_bed
6110 #define elf32_bed elf32_i386_nacl_bed
6111
6112 #undef ELF_MAXPAGESIZE
6113 #define ELF_MAXPAGESIZE 0x10000
6114
6115 /* Restore defaults. */
6116 #undef ELF_OSABI
6117 #undef elf_backend_want_plt_sym
6118 #define elf_backend_want_plt_sym 0
6119 #undef elf_backend_post_process_headers
6120 #undef elf_backend_static_tls_alignment
6121
6122 /* NaCl uses substantially different PLT entries for the same effects. */
6123
6124 #undef elf_backend_plt_alignment
6125 #define elf_backend_plt_alignment 5
6126 #define NACL_PLT_ENTRY_SIZE 64
6127 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6128
6129 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6130 {
6131 0xff, 0x35, /* pushl contents of address */
6132 0, 0, 0, 0, /* replaced with address of .got + 4. */
6133 0x8b, 0x0d, /* movl contents of address, %ecx */
6134 0, 0, 0, 0, /* replaced with address of .got + 8. */
6135 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6136 0xff, 0xe1 /* jmp *%ecx */
6137 };
6138
6139 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6140 {
6141 0x8b, 0x0d, /* movl contents of address, %ecx */
6142 0, 0, 0, 0, /* replaced with GOT slot address. */
6143 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6144 0xff, 0xe1, /* jmp *%ecx */
6145
6146 /* Pad to the next 32-byte boundary with nop instructions. */
6147 0x90,
6148 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6149 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6150
6151 /* Lazy GOT entries point here (32-byte aligned). */
6152 0x68, /* pushl immediate */
6153 0, 0, 0, 0, /* replaced with reloc offset. */
6154 0xe9, /* jmp relative */
6155 0, 0, 0, 0, /* replaced with offset to .plt. */
6156
6157 /* Pad to the next 32-byte boundary with nop instructions. */
6158 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6159 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6160 0x90, 0x90
6161 };
6162
6163 static const bfd_byte
6164 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6165 {
6166 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6167 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6168 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6169 0xff, 0xe1, /* jmp *%ecx */
6170
6171 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6172 so pad to that size with nop instructions. */
6173 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6174 };
6175
6176 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6177 {
6178 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6179 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6180 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6181 0xff, 0xe1, /* jmp *%ecx */
6182
6183 /* Pad to the next 32-byte boundary with nop instructions. */
6184 0x90,
6185 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6186 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6187
6188 /* Lazy GOT entries point here (32-byte aligned). */
6189 0x68, /* pushl immediate */
6190 0, 0, 0, 0, /* replaced with offset into relocation table. */
6191 0xe9, /* jmp relative */
6192 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6193
6194 /* Pad to the next 32-byte boundary with nop instructions. */
6195 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6196 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6197 0x90, 0x90
6198 };
6199
6200 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6201 {
6202 #if (PLT_CIE_LENGTH != 20 \
6203 || PLT_FDE_LENGTH != 36 \
6204 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6205 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6206 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6207 #endif
6208 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6209 0, 0, 0, 0, /* CIE ID */
6210 1, /* CIE version */
6211 'z', 'R', 0, /* Augmentation string */
6212 1, /* Code alignment factor */
6213 0x7c, /* Data alignment factor: -4 */
6214 8, /* Return address column */
6215 1, /* Augmentation size */
6216 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6217 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6218 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6219 DW_CFA_nop, DW_CFA_nop,
6220
6221 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6222 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6223 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6224 0, 0, 0, 0, /* .plt size goes here */
6225 0, /* Augmentation size */
6226 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6227 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6228 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6229 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6230 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6231 13, /* Block length */
6232 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6233 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6234 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6235 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6236 DW_CFA_nop, DW_CFA_nop
6237 };
6238
6239 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6240 {
6241 elf_i386_nacl_plt0_entry, /* plt0_entry */
6242 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6243 2, /* plt0_got1_offset */
6244 8, /* plt0_got2_offset */
6245 elf_i386_nacl_plt_entry, /* plt_entry */
6246 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6247 2, /* plt_got_offset */
6248 33, /* plt_reloc_offset */
6249 38, /* plt_plt_offset */
6250 32, /* plt_lazy_offset */
6251 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6252 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6253 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6254 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6255 };
6256
6257 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6258 {
6259 &elf_i386_nacl_plt, /* plt */
6260 0x90, /* plt0_pad_byte: nop insn */
6261 0, /* is_vxworks */
6262 };
6263
6264 static bfd_boolean
6265 elf32_i386_nacl_elf_object_p (bfd *abfd)
6266 {
6267 /* Set the right machine number for a NaCl i386 ELF32 file. */
6268 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6269 return TRUE;
6270 }
6271
6272 #undef elf_backend_arch_data
6273 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6274
6275 #undef elf_backend_object_p
6276 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6277 #undef elf_backend_modify_segment_map
6278 #define elf_backend_modify_segment_map nacl_modify_segment_map
6279 #undef elf_backend_modify_program_headers
6280 #define elf_backend_modify_program_headers nacl_modify_program_headers
6281 #undef elf_backend_final_write_processing
6282 #define elf_backend_final_write_processing nacl_final_write_processing
6283
6284 #include "elf32-target.h"
6285
6286 /* Restore defaults. */
6287 #undef elf_backend_object_p
6288 #undef elf_backend_modify_segment_map
6289 #undef elf_backend_modify_program_headers
6290 #undef elf_backend_final_write_processing
6291
6292 /* VxWorks support. */
6293
6294 #undef TARGET_LITTLE_SYM
6295 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6296 #undef TARGET_LITTLE_NAME
6297 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6298 #undef ELF_OSABI
6299 #undef elf_backend_plt_alignment
6300 #define elf_backend_plt_alignment 4
6301
6302 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6303 {
6304 &elf_i386_plt, /* plt */
6305 0x90, /* plt0_pad_byte */
6306 1, /* is_vxworks */
6307 };
6308
6309 #undef elf_backend_arch_data
6310 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6311
6312 #undef elf_backend_relocs_compatible
6313 #undef elf_backend_add_symbol_hook
6314 #define elf_backend_add_symbol_hook \
6315 elf_vxworks_add_symbol_hook
6316 #undef elf_backend_link_output_symbol_hook
6317 #define elf_backend_link_output_symbol_hook \
6318 elf_vxworks_link_output_symbol_hook
6319 #undef elf_backend_emit_relocs
6320 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6321 #undef elf_backend_final_write_processing
6322 #define elf_backend_final_write_processing \
6323 elf_vxworks_final_write_processing
6324 #undef elf_backend_static_tls_alignment
6325
6326 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6327 define it. */
6328 #undef elf_backend_want_plt_sym
6329 #define elf_backend_want_plt_sym 1
6330
6331 #undef elf32_bed
6332 #define elf32_bed elf32_i386_vxworks_bed
6333
6334 #include "elf32-target.h"
GDB Binutils - Deliverables
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