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Make import libraries relocatable objects
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
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1/* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 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
39static 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
199static reloc_howto_type *
200elf_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
359static reloc_howto_type *
360elf_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
373static reloc_howto_type *
374elf_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 /* xgettext:c-format */
387 _bfd_error_handler (_("%B: invalid relocation type %d"),
388 abfd, (int) r_type);
389 indx = R_386_NONE;
390 }
391 /* PR 17512: file: 0f67f69d. */
392 if (elf_howto_table [indx].type != r_type)
393 return NULL;
394 return &elf_howto_table[indx];
395}
396
397static void
398elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
399 arelent *cache_ptr,
400 Elf_Internal_Rela *dst)
401{
402 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
403 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
404}
405
406/* Return whether a symbol name implies a local label. The UnixWare
407 2.1 cc generates temporary symbols that start with .X, so we
408 recognize them here. FIXME: do other SVR4 compilers also use .X?.
409 If so, we should move the .X recognition into
410 _bfd_elf_is_local_label_name. */
411
412static bfd_boolean
413elf_i386_is_local_label_name (bfd *abfd, const char *name)
414{
415 if (name[0] == '.' && name[1] == 'X')
416 return TRUE;
417
418 return _bfd_elf_is_local_label_name (abfd, name);
419}
420\f
421/* Support for core dump NOTE sections. */
422
423static bfd_boolean
424elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
425{
426 int offset;
427 size_t size;
428
429 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
430 {
431 int pr_version = bfd_get_32 (abfd, note->descdata);
432
433 if (pr_version != 1)
434 return FALSE;
435
436 /* pr_cursig */
437 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 28;
444 size = bfd_get_32 (abfd, note->descdata + 8);
445 }
446 else
447 {
448 switch (note->descsz)
449 {
450 default:
451 return FALSE;
452
453 case 144: /* Linux/i386 */
454 /* pr_cursig */
455 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
456
457 /* pr_pid */
458 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
459
460 /* pr_reg */
461 offset = 72;
462 size = 68;
463
464 break;
465 }
466 }
467
468 /* Make a ".reg/999" section. */
469 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
470 size, note->descpos + offset);
471}
472
473static bfd_boolean
474elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
475{
476 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
477 {
478 int pr_version = bfd_get_32 (abfd, note->descdata);
479
480 if (pr_version != 1)
481 return FALSE;
482
483 elf_tdata (abfd)->core->program
484 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
485 elf_tdata (abfd)->core->command
486 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
487 }
488 else
489 {
490 switch (note->descsz)
491 {
492 default:
493 return FALSE;
494
495 case 124: /* Linux/i386 elf_prpsinfo. */
496 elf_tdata (abfd)->core->pid
497 = bfd_get_32 (abfd, note->descdata + 12);
498 elf_tdata (abfd)->core->program
499 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
500 elf_tdata (abfd)->core->command
501 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
502 }
503 }
504
505 /* Note that for some reason, a spurious space is tacked
506 onto the end of the args in some (at least one anyway)
507 implementations, so strip it off if it exists. */
508 {
509 char *command = elf_tdata (abfd)->core->command;
510 int n = strlen (command);
511
512 if (0 < n && command[n - 1] == ' ')
513 command[n - 1] = '\0';
514 }
515
516 return TRUE;
517}
518\f
519/* Functions for the i386 ELF linker.
520
521 In order to gain some understanding of code in this file without
522 knowing all the intricate details of the linker, note the
523 following:
524
525 Functions named elf_i386_* are called by external routines, other
526 functions are only called locally. elf_i386_* functions appear
527 in this file more or less in the order in which they are called
528 from external routines. eg. elf_i386_check_relocs is called
529 early in the link process, elf_i386_finish_dynamic_sections is
530 one of the last functions. */
531
532
533/* The name of the dynamic interpreter. This is put in the .interp
534 section. */
535
536#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537
538/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
539 copying dynamic variables from a shared lib into an app's dynbss
540 section, and instead use a dynamic relocation to point into the
541 shared lib. */
542#define ELIMINATE_COPY_RELOCS 1
543
544/* The size in bytes of an entry in the procedure linkage table. */
545
546#define PLT_ENTRY_SIZE 16
547
548/* The first entry in an absolute procedure linkage table looks like
549 this. See the SVR4 ABI i386 supplement to see how this works.
550 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
551
552static const bfd_byte elf_i386_plt0_entry[12] =
553{
554 0xff, 0x35, /* pushl contents of address */
555 0, 0, 0, 0, /* replaced with address of .got + 4. */
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0 /* replaced with address of .got + 8. */
558};
559
560/* Subsequent entries in an absolute procedure linkage table look like
561 this. */
562
563static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
564{
565 0xff, 0x25, /* jmp indirect */
566 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
567 0x68, /* pushl immediate */
568 0, 0, 0, 0, /* replaced with offset into relocation table. */
569 0xe9, /* jmp relative */
570 0, 0, 0, 0 /* replaced with offset to start of .plt. */
571};
572
573/* The first entry in a PIC procedure linkage table look like this.
574 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
575
576static const bfd_byte elf_i386_pic_plt0_entry[12] =
577{
578 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
579 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
580};
581
582/* Subsequent entries in a PIC procedure linkage table look like this. */
583
584static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
585{
586 0xff, 0xa3, /* jmp *offset(%ebx) */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x68, /* pushl immediate */
589 0, 0, 0, 0, /* replaced with offset into relocation table. */
590 0xe9, /* jmp relative */
591 0, 0, 0, 0 /* replaced with offset to start of .plt. */
592};
593
594/* Entries in the GOT procedure linkage table look like this. */
595
596static const bfd_byte elf_i386_got_plt_entry[8] =
597{
598 0xff, 0x25, /* jmp indirect */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601};
602
603/* Entries in the PIC GOT procedure linkage table look like this. */
604
605static const bfd_byte elf_i386_pic_got_plt_entry[8] =
606{
607 0xff, 0xa3, /* jmp *offset(%ebx) */
608 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610};
611
612/* .eh_frame covering the .plt section. */
613
614static const bfd_byte elf_i386_eh_frame_plt[] =
615{
616#define PLT_CIE_LENGTH 20
617#define PLT_FDE_LENGTH 36
618#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
619#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
620 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
621 0, 0, 0, 0, /* CIE ID */
622 1, /* CIE version */
623 'z', 'R', 0, /* Augmentation string */
624 1, /* Code alignment factor */
625 0x7c, /* Data alignment factor */
626 8, /* Return address column */
627 1, /* Augmentation size */
628 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
629 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
630 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
631 DW_CFA_nop, DW_CFA_nop,
632
633 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
634 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
635 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
636 0, 0, 0, 0, /* .plt size goes here */
637 0, /* Augmentation size */
638 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
639 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
640 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
641 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
642 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
643 11, /* Block length */
644 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
645 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
646 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
647 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
648 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
649};
650
651/* .eh_frame covering the .plt.got section. */
652
653static const bfd_byte elf_i386_eh_frame_plt_got[] =
654{
655#define PLT_GOT_FDE_LENGTH 16
656 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
657 0, 0, 0, 0, /* CIE ID */
658 1, /* CIE version */
659 'z', 'R', 0, /* Augmentation string */
660 1, /* Code alignment factor */
661 0x7c, /* Data alignment factor */
662 8, /* Return address column */
663 1, /* Augmentation size */
664 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
665 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
666 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
667 DW_CFA_nop, DW_CFA_nop,
668
669 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
670 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
671 0, 0, 0, 0, /* the start of .plt.got goes here */
672 0, 0, 0, 0, /* .plt.got size goes here */
673 0, /* Augmentation size */
674 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
675};
676
677struct elf_i386_plt_layout
678{
679 /* The first entry in an absolute procedure linkage table looks like this. */
680 const bfd_byte *plt0_entry;
681 unsigned int plt0_entry_size;
682
683 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
684 unsigned int plt0_got1_offset;
685 unsigned int plt0_got2_offset;
686
687 /* Later entries in an absolute procedure linkage table look like this. */
688 const bfd_byte *plt_entry;
689 unsigned int plt_entry_size;
690
691 /* Offsets into plt_entry that are to be replaced with... */
692 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
693 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
694 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
695
696 /* Offset into plt_entry where the initial value of the GOT entry points. */
697 unsigned int plt_lazy_offset;
698
699 /* The first entry in a PIC procedure linkage table looks like this. */
700 const bfd_byte *pic_plt0_entry;
701
702 /* Subsequent entries in a PIC procedure linkage table look like this. */
703 const bfd_byte *pic_plt_entry;
704
705 /* .eh_frame covering the .plt section. */
706 const bfd_byte *eh_frame_plt;
707 unsigned int eh_frame_plt_size;
708
709 /* .eh_frame covering the .plt.got section. */
710 const bfd_byte *eh_frame_plt_got;
711 unsigned int eh_frame_plt_got_size;
712};
713
714#define GET_PLT_ENTRY_SIZE(abfd) \
715 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
716
717/* These are the standard parameters. */
718static const struct elf_i386_plt_layout elf_i386_plt =
719 {
720 elf_i386_plt0_entry, /* plt0_entry */
721 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
722 2, /* plt0_got1_offset */
723 8, /* plt0_got2_offset */
724 elf_i386_plt_entry, /* plt_entry */
725 PLT_ENTRY_SIZE, /* plt_entry_size */
726 2, /* plt_got_offset */
727 7, /* plt_reloc_offset */
728 12, /* plt_plt_offset */
729 6, /* plt_lazy_offset */
730 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
731 elf_i386_pic_plt_entry, /* pic_plt_entry */
732 elf_i386_eh_frame_plt, /* eh_frame_plt */
733 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
734 elf_i386_eh_frame_plt_got, /* eh_frame_plt_got */
735 sizeof (elf_i386_eh_frame_plt_got), /* eh_frame_plt_got_size */
736 };
737\f
738
739/* On VxWorks, the .rel.plt.unloaded section has absolute relocations
740 for the PLTResolve stub and then for each PLT entry. */
741#define PLTRESOLVE_RELOCS_SHLIB 0
742#define PLTRESOLVE_RELOCS 2
743#define PLT_NON_JUMP_SLOT_RELOCS 2
744
745/* Architecture-specific backend data for i386. */
746
747struct elf_i386_backend_data
748{
749 /* Parameters describing PLT generation. */
750 const struct elf_i386_plt_layout *plt;
751
752 /* Value used to fill the unused bytes of the first PLT entry. */
753 bfd_byte plt0_pad_byte;
754
755 /* True if the target system is VxWorks. */
756 int is_vxworks;
757};
758
759#define get_elf_i386_backend_data(abfd) \
760 ((const struct elf_i386_backend_data *) \
761 get_elf_backend_data (abfd)->arch_data)
762
763/* These are the standard parameters. */
764static const struct elf_i386_backend_data elf_i386_arch_bed =
765 {
766 &elf_i386_plt, /* plt */
767 0, /* plt0_pad_byte */
768 0, /* is_vxworks */
769 };
770
771#define elf_backend_arch_data &elf_i386_arch_bed
772
773/* Is a undefined weak symbol which is resolved to 0. Reference to an
774 undefined weak symbol is resolved to 0 when building executable if
775 it isn't dynamic and
776 1. Has non-GOT/non-PLT relocations in text section. Or
777 2. Has no GOT/PLT relocation.
778 */
779#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
780 ((EH)->elf.root.type == bfd_link_hash_undefweak \
781 && bfd_link_executable (INFO) \
782 && (elf_i386_hash_table (INFO)->interp == NULL \
783 || !(GOT_RELOC) \
784 || (EH)->has_non_got_reloc \
785 || !(INFO)->dynamic_undefined_weak))
786
787/* i386 ELF linker hash entry. */
788
789struct elf_i386_link_hash_entry
790{
791 struct elf_link_hash_entry elf;
792
793 /* Track dynamic relocs copied for this symbol. */
794 struct elf_dyn_relocs *dyn_relocs;
795
796#define GOT_UNKNOWN 0
797#define GOT_NORMAL 1
798#define GOT_TLS_GD 2
799#define GOT_TLS_IE 4
800#define GOT_TLS_IE_POS 5
801#define GOT_TLS_IE_NEG 6
802#define GOT_TLS_IE_BOTH 7
803#define GOT_TLS_GDESC 8
804#define GOT_TLS_GD_BOTH_P(type) \
805 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
806#define GOT_TLS_GD_P(type) \
807 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
808#define GOT_TLS_GDESC_P(type) \
809 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
810#define GOT_TLS_GD_ANY_P(type) \
811 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
812 unsigned char tls_type;
813
814 /* Symbol is referenced by R_386_GOTOFF relocation. */
815 unsigned int gotoff_ref : 1;
816
817 /* Symbol has GOT or PLT relocations. */
818 unsigned int has_got_reloc : 1;
819
820 /* Symbol has non-GOT/non-PLT relocations in text sections. */
821 unsigned int has_non_got_reloc : 1;
822
823 /* Don't call finish_dynamic_symbol on this symbol. */
824 unsigned int no_finish_dynamic_symbol : 1;
825
826 /* 0: symbol isn't ___tls_get_addr.
827 1: symbol is ___tls_get_addr.
828 2: symbol is unknown. */
829 unsigned int tls_get_addr : 2;
830
831 /* Reference count of C/C++ function pointer relocations in read-write
832 section which can be resolved at run-time. */
833 bfd_signed_vma func_pointer_refcount;
834
835 /* Information about the GOT PLT entry. Filled when there are both
836 GOT and PLT relocations against the same function. */
837 union gotplt_union plt_got;
838
839 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
840 starting at the end of the jump table. */
841 bfd_vma tlsdesc_got;
842};
843
844#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
845
846struct elf_i386_obj_tdata
847{
848 struct elf_obj_tdata root;
849
850 /* tls_type for each local got entry. */
851 char *local_got_tls_type;
852
853 /* GOTPLT entries for TLS descriptors. */
854 bfd_vma *local_tlsdesc_gotent;
855};
856
857#define elf_i386_tdata(abfd) \
858 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
859
860#define elf_i386_local_got_tls_type(abfd) \
861 (elf_i386_tdata (abfd)->local_got_tls_type)
862
863#define elf_i386_local_tlsdesc_gotent(abfd) \
864 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
865
866#define is_i386_elf(bfd) \
867 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
868 && elf_tdata (bfd) != NULL \
869 && elf_object_id (bfd) == I386_ELF_DATA)
870
871static bfd_boolean
872elf_i386_mkobject (bfd *abfd)
873{
874 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
875 I386_ELF_DATA);
876}
877
878/* i386 ELF linker hash table. */
879
880struct elf_i386_link_hash_table
881{
882 struct elf_link_hash_table elf;
883
884 /* Short-cuts to get to dynamic linker sections. */
885 asection *interp;
886 asection *plt_eh_frame;
887 asection *plt_got;
888 asection *plt_got_eh_frame;
889
890 union
891 {
892 bfd_signed_vma refcount;
893 bfd_vma offset;
894 } tls_ldm_got;
895
896 /* The amount of space used by the reserved portion of the sgotplt
897 section, plus whatever space is used by the jump slots. */
898 bfd_vma sgotplt_jump_table_size;
899
900 /* Small local sym cache. */
901 struct sym_cache sym_cache;
902
903 /* _TLS_MODULE_BASE_ symbol. */
904 struct bfd_link_hash_entry *tls_module_base;
905
906 /* Used by local STT_GNU_IFUNC symbols. */
907 htab_t loc_hash_table;
908 void * loc_hash_memory;
909
910 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
911 asection *srelplt2;
912
913 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
914 bfd_vma next_tls_desc_index;
915
916 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
917 bfd_vma next_jump_slot_index;
918
919 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
920 bfd_vma next_irelative_index;
921
922 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
923 to read-only sections. */
924 bfd_boolean readonly_dynrelocs_against_ifunc;
925};
926
927/* Get the i386 ELF linker hash table from a link_info structure. */
928
929#define elf_i386_hash_table(p) \
930 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
931 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
932
933#define elf_i386_compute_jump_table_size(htab) \
934 ((htab)->elf.srelplt->reloc_count * 4)
935
936/* Create an entry in an i386 ELF linker hash table. */
937
938static struct bfd_hash_entry *
939elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
940 struct bfd_hash_table *table,
941 const char *string)
942{
943 /* Allocate the structure if it has not already been allocated by a
944 subclass. */
945 if (entry == NULL)
946 {
947 entry = (struct bfd_hash_entry *)
948 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
949 if (entry == NULL)
950 return entry;
951 }
952
953 /* Call the allocation method of the superclass. */
954 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
955 if (entry != NULL)
956 {
957 struct elf_i386_link_hash_entry *eh;
958
959 eh = (struct elf_i386_link_hash_entry *) entry;
960 eh->dyn_relocs = NULL;
961 eh->tls_type = GOT_UNKNOWN;
962 eh->gotoff_ref = 0;
963 eh->has_got_reloc = 0;
964 eh->has_non_got_reloc = 0;
965 eh->no_finish_dynamic_symbol = 0;
966 eh->tls_get_addr = 2;
967 eh->func_pointer_refcount = 0;
968 eh->plt_got.offset = (bfd_vma) -1;
969 eh->tlsdesc_got = (bfd_vma) -1;
970 }
971
972 return entry;
973}
974
975/* Compute a hash of a local hash entry. We use elf_link_hash_entry
976 for local symbol so that we can handle local STT_GNU_IFUNC symbols
977 as global symbol. We reuse indx and dynstr_index for local symbol
978 hash since they aren't used by global symbols in this backend. */
979
980static hashval_t
981elf_i386_local_htab_hash (const void *ptr)
982{
983 struct elf_link_hash_entry *h
984 = (struct elf_link_hash_entry *) ptr;
985 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
986}
987
988/* Compare local hash entries. */
989
990static int
991elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
992{
993 struct elf_link_hash_entry *h1
994 = (struct elf_link_hash_entry *) ptr1;
995 struct elf_link_hash_entry *h2
996 = (struct elf_link_hash_entry *) ptr2;
997
998 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
999}
1000
1001/* Find and/or create a hash entry for local symbol. */
1002
1003static struct elf_link_hash_entry *
1004elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
1005 bfd *abfd, const Elf_Internal_Rela *rel,
1006 bfd_boolean create)
1007{
1008 struct elf_i386_link_hash_entry e, *ret;
1009 asection *sec = abfd->sections;
1010 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1011 ELF32_R_SYM (rel->r_info));
1012 void **slot;
1013
1014 e.elf.indx = sec->id;
1015 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1016 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1017 create ? INSERT : NO_INSERT);
1018
1019 if (!slot)
1020 return NULL;
1021
1022 if (*slot)
1023 {
1024 ret = (struct elf_i386_link_hash_entry *) *slot;
1025 return &ret->elf;
1026 }
1027
1028 ret = (struct elf_i386_link_hash_entry *)
1029 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1030 sizeof (struct elf_i386_link_hash_entry));
1031 if (ret)
1032 {
1033 memset (ret, 0, sizeof (*ret));
1034 ret->elf.indx = sec->id;
1035 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1036 ret->elf.dynindx = -1;
1037 ret->func_pointer_refcount = 0;
1038 ret->plt_got.offset = (bfd_vma) -1;
1039 *slot = ret;
1040 }
1041 return &ret->elf;
1042}
1043
1044/* Destroy an i386 ELF linker hash table. */
1045
1046static void
1047elf_i386_link_hash_table_free (bfd *obfd)
1048{
1049 struct elf_i386_link_hash_table *htab
1050 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1051
1052 if (htab->loc_hash_table)
1053 htab_delete (htab->loc_hash_table);
1054 if (htab->loc_hash_memory)
1055 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1056 _bfd_elf_link_hash_table_free (obfd);
1057}
1058
1059/* Create an i386 ELF linker hash table. */
1060
1061static struct bfd_link_hash_table *
1062elf_i386_link_hash_table_create (bfd *abfd)
1063{
1064 struct elf_i386_link_hash_table *ret;
1065 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1066
1067 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1068 if (ret == NULL)
1069 return NULL;
1070
1071 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1072 elf_i386_link_hash_newfunc,
1073 sizeof (struct elf_i386_link_hash_entry),
1074 I386_ELF_DATA))
1075 {
1076 free (ret);
1077 return NULL;
1078 }
1079
1080 ret->loc_hash_table = htab_try_create (1024,
1081 elf_i386_local_htab_hash,
1082 elf_i386_local_htab_eq,
1083 NULL);
1084 ret->loc_hash_memory = objalloc_create ();
1085 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1086 {
1087 elf_i386_link_hash_table_free (abfd);
1088 return NULL;
1089 }
1090 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1091
1092 return &ret->elf.root;
1093}
1094
1095/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1096 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1097 hash table. */
1098
1099static bfd_boolean
1100elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1101{
1102 struct elf_i386_link_hash_table *htab;
1103
1104 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1105 return FALSE;
1106
1107 htab = elf_i386_hash_table (info);
1108 if (htab == NULL)
1109 return FALSE;
1110
1111 /* Set the contents of the .interp section to the interpreter. */
1112 if (bfd_link_executable (info) && !info->nointerp)
1113 {
1114 asection *s = bfd_get_linker_section (dynobj, ".interp");
1115 if (s == NULL)
1116 abort ();
1117 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1118 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1119 htab->interp = s;
1120 }
1121
1122 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1123 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1124 &htab->srelplt2))
1125 return FALSE;
1126
1127 if (htab->elf.splt != NULL)
1128 {
1129 if (htab->plt_got == NULL
1130 && !get_elf_i386_backend_data (dynobj)->is_vxworks
1131 && get_elf_i386_backend_data (dynobj) == &elf_i386_arch_bed)
1132 {
1133 /* Create the GOT procedure linkage table. */
1134 unsigned int plt_got_align;
1135 const struct elf_backend_data *bed;
1136
1137 bed = get_elf_backend_data (dynobj);
1138 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1139 && (sizeof (elf_i386_got_plt_entry)
1140 == sizeof (elf_i386_pic_got_plt_entry)));
1141 plt_got_align = 3;
1142
1143 htab->plt_got
1144 = bfd_make_section_anyway_with_flags (dynobj,
1145 ".plt.got",
1146 (bed->dynamic_sec_flags
1147 | SEC_ALLOC
1148 | SEC_CODE
1149 | SEC_LOAD
1150 | SEC_READONLY));
1151 if (htab->plt_got == NULL
1152 || !bfd_set_section_alignment (dynobj,
1153 htab->plt_got,
1154 plt_got_align))
1155 return FALSE;
1156 }
1157
1158 if (!info->no_ld_generated_unwind_info)
1159 {
1160 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1161 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1162 | SEC_LINKER_CREATED);
1163
1164 if (htab->plt_eh_frame == NULL)
1165 {
1166 htab->plt_eh_frame
1167 = bfd_make_section_anyway_with_flags (dynobj,
1168 ".eh_frame",
1169 flags);
1170 if (htab->plt_eh_frame == NULL
1171 || !bfd_set_section_alignment (dynobj,
1172 htab->plt_eh_frame,
1173 2))
1174 return FALSE;
1175 }
1176
1177 if (htab->plt_got_eh_frame == NULL
1178 && htab->plt_got != NULL)
1179 {
1180 htab->plt_got_eh_frame
1181 = bfd_make_section_anyway_with_flags (dynobj,
1182 ".eh_frame",
1183 flags);
1184 if (htab->plt_got_eh_frame == NULL
1185 || !bfd_set_section_alignment (dynobj,
1186 htab->plt_got_eh_frame,
1187 2))
1188 return FALSE;
1189 }
1190 }
1191 }
1192
1193 return TRUE;
1194}
1195
1196/* Copy the extra info we tack onto an elf_link_hash_entry. */
1197
1198static void
1199elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1200 struct elf_link_hash_entry *dir,
1201 struct elf_link_hash_entry *ind)
1202{
1203 struct elf_i386_link_hash_entry *edir, *eind;
1204
1205 edir = (struct elf_i386_link_hash_entry *) dir;
1206 eind = (struct elf_i386_link_hash_entry *) ind;
1207
1208 if (eind->dyn_relocs != NULL)
1209 {
1210 if (edir->dyn_relocs != NULL)
1211 {
1212 struct elf_dyn_relocs **pp;
1213 struct elf_dyn_relocs *p;
1214
1215 /* Add reloc counts against the indirect sym to the direct sym
1216 list. Merge any entries against the same section. */
1217 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1218 {
1219 struct elf_dyn_relocs *q;
1220
1221 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1222 if (q->sec == p->sec)
1223 {
1224 q->pc_count += p->pc_count;
1225 q->count += p->count;
1226 *pp = p->next;
1227 break;
1228 }
1229 if (q == NULL)
1230 pp = &p->next;
1231 }
1232 *pp = edir->dyn_relocs;
1233 }
1234
1235 edir->dyn_relocs = eind->dyn_relocs;
1236 eind->dyn_relocs = NULL;
1237 }
1238
1239 if (ind->root.type == bfd_link_hash_indirect
1240 && dir->got.refcount <= 0)
1241 {
1242 edir->tls_type = eind->tls_type;
1243 eind->tls_type = GOT_UNKNOWN;
1244 }
1245
1246 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1247 generate a R_386_COPY reloc. */
1248 edir->gotoff_ref |= eind->gotoff_ref;
1249
1250 edir->has_got_reloc |= eind->has_got_reloc;
1251 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1252
1253 if (ELIMINATE_COPY_RELOCS
1254 && ind->root.type != bfd_link_hash_indirect
1255 && dir->dynamic_adjusted)
1256 {
1257 /* If called to transfer flags for a weakdef during processing
1258 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1259 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1260 if (dir->versioned != versioned_hidden)
1261 dir->ref_dynamic |= ind->ref_dynamic;
1262 dir->ref_regular |= ind->ref_regular;
1263 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1264 dir->needs_plt |= ind->needs_plt;
1265 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1266 }
1267 else
1268 {
1269 if (eind->func_pointer_refcount > 0)
1270 {
1271 edir->func_pointer_refcount += eind->func_pointer_refcount;
1272 eind->func_pointer_refcount = 0;
1273 }
1274
1275 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1276 }
1277}
1278
1279/* Return TRUE if the TLS access code sequence support transition
1280 from R_TYPE. */
1281
1282static bfd_boolean
1283elf_i386_check_tls_transition (asection *sec,
1284 bfd_byte *contents,
1285 Elf_Internal_Shdr *symtab_hdr,
1286 struct elf_link_hash_entry **sym_hashes,
1287 unsigned int r_type,
1288 const Elf_Internal_Rela *rel,
1289 const Elf_Internal_Rela *relend)
1290{
1291 unsigned int val, type, reg;
1292 unsigned long r_symndx;
1293 struct elf_link_hash_entry *h;
1294 bfd_vma offset;
1295 bfd_byte *call;
1296 bfd_boolean indirect_call, tls_get_addr;
1297
1298 offset = rel->r_offset;
1299 switch (r_type)
1300 {
1301 case R_386_TLS_GD:
1302 case R_386_TLS_LDM:
1303 if (offset < 2 || (rel + 1) >= relend)
1304 return FALSE;
1305
1306 indirect_call = FALSE;
1307 call = contents + offset + 4;
1308 val = *(call - 5);
1309 type = *(call - 6);
1310 if (r_type == R_386_TLS_GD)
1311 {
1312 /* Check transition from GD access model. Only
1313 leal foo@tlsgd(,%ebx,1), %eax
1314 call ___tls_get_addr@PLT
1315 or
1316 leal foo@tlsgd(%ebx) %eax
1317 call ___tls_get_addr@PLT
1318 nop
1319 or
1320 leal foo@tlsgd(%reg), %eax
1321 call *___tls_get_addr@GOT(%reg)
1322 which may be converted to
1323 addr32 call ___tls_get_addr
1324 can transit to different access model. */
1325 if ((offset + 10) > sec->size
1326 || (type != 0x8d && type != 0x04))
1327 return FALSE;
1328
1329 if (type == 0x04)
1330 {
1331 /* leal foo@tlsgd(,%ebx,1), %eax
1332 call ___tls_get_addr@PLT */
1333 if (offset < 3)
1334 return FALSE;
1335
1336 if (*(call - 7) != 0x8d
1337 || val != 0x1d
1338 || call[0] != 0xe8)
1339 return FALSE;
1340 }
1341 else
1342 {
1343 /* This must be
1344 leal foo@tlsgd(%ebx), %eax
1345 call ___tls_get_addr@PLT
1346 nop
1347 or
1348 leal foo@tlsgd(%reg), %eax
1349 call *___tls_get_addr@GOT(%reg)
1350 which may be converted to
1351 addr32 call ___tls_get_addr
1352
1353 %eax can't be used as the GOT base register since it
1354 is used to pass parameter to ___tls_get_addr. */
1355 reg = val & 7;
1356 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1357 return FALSE;
1358
1359 indirect_call = call[0] == 0xff;
1360 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1361 && !(call[0] == 0x67 && call[1] == 0xe8)
1362 && !(indirect_call
1363 && (call[1] & 0xf8) == 0x90
1364 && (call[1] & 0x7) == reg))
1365 return FALSE;
1366 }
1367 }
1368 else
1369 {
1370 /* Check transition from LD access model. Only
1371 leal foo@tlsldm(%ebx), %eax
1372 call ___tls_get_addr@PLT
1373 or
1374 leal foo@tlsldm(%reg), %eax
1375 call *___tls_get_addr@GOT(%reg)
1376 which may be converted to
1377 addr32 call ___tls_get_addr
1378 can transit to different access model. */
1379 if (type != 0x8d || (offset + 9) > sec->size)
1380 return FALSE;
1381
1382 /* %eax can't be used as the GOT base register since it is
1383 used to pass parameter to ___tls_get_addr. */
1384 reg = val & 7;
1385 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1386 return FALSE;
1387
1388 indirect_call = call[0] == 0xff;
1389 if (!(reg == 3 && call[0] == 0xe8)
1390 && !(call[0] == 0x67 && call[1] == 0xe8)
1391 && !(indirect_call
1392 && (call[1] & 0xf8) == 0x90
1393 && (call[1] & 0x7) == reg))
1394 return FALSE;
1395 }
1396
1397 r_symndx = ELF32_R_SYM (rel[1].r_info);
1398 if (r_symndx < symtab_hdr->sh_info)
1399 return FALSE;
1400
1401 tls_get_addr = FALSE;
1402 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1403 if (h != NULL && h->root.root.string != NULL)
1404 {
1405 struct elf_i386_link_hash_entry *eh
1406 = (struct elf_i386_link_hash_entry *) h;
1407 tls_get_addr = eh->tls_get_addr == 1;
1408 if (eh->tls_get_addr > 1)
1409 {
1410 /* Use strncmp to check ___tls_get_addr since
1411 ___tls_get_addr may be versioned. */
1412 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1413 == 0)
1414 {
1415 eh->tls_get_addr = 1;
1416 tls_get_addr = TRUE;
1417 }
1418 else
1419 eh->tls_get_addr = 0;
1420 }
1421 }
1422
1423 if (!tls_get_addr)
1424 return FALSE;
1425 else if (indirect_call)
1426 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1427 else
1428 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1429 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1430
1431 case R_386_TLS_IE:
1432 /* Check transition from IE access model:
1433 movl foo@indntpoff(%rip), %eax
1434 movl foo@indntpoff(%rip), %reg
1435 addl foo@indntpoff(%rip), %reg
1436 */
1437
1438 if (offset < 1 || (offset + 4) > sec->size)
1439 return FALSE;
1440
1441 /* Check "movl foo@tpoff(%rip), %eax" first. */
1442 val = bfd_get_8 (abfd, contents + offset - 1);
1443 if (val == 0xa1)
1444 return TRUE;
1445
1446 if (offset < 2)
1447 return FALSE;
1448
1449 /* Check movl|addl foo@tpoff(%rip), %reg. */
1450 type = bfd_get_8 (abfd, contents + offset - 2);
1451 return ((type == 0x8b || type == 0x03)
1452 && (val & 0xc7) == 0x05);
1453
1454 case R_386_TLS_GOTIE:
1455 case R_386_TLS_IE_32:
1456 /* Check transition from {IE_32,GOTIE} access model:
1457 subl foo@{tpoff,gontoff}(%reg1), %reg2
1458 movl foo@{tpoff,gontoff}(%reg1), %reg2
1459 addl foo@{tpoff,gontoff}(%reg1), %reg2
1460 */
1461
1462 if (offset < 2 || (offset + 4) > sec->size)
1463 return FALSE;
1464
1465 val = bfd_get_8 (abfd, contents + offset - 1);
1466 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1467 return FALSE;
1468
1469 type = bfd_get_8 (abfd, contents + offset - 2);
1470 return type == 0x8b || type == 0x2b || type == 0x03;
1471
1472 case R_386_TLS_GOTDESC:
1473 /* Check transition from GDesc access model:
1474 leal x@tlsdesc(%ebx), %eax
1475
1476 Make sure it's a leal adding ebx to a 32-bit offset
1477 into any register, although it's probably almost always
1478 going to be eax. */
1479
1480 if (offset < 2 || (offset + 4) > sec->size)
1481 return FALSE;
1482
1483 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1484 return FALSE;
1485
1486 val = bfd_get_8 (abfd, contents + offset - 1);
1487 return (val & 0xc7) == 0x83;
1488
1489 case R_386_TLS_DESC_CALL:
1490 /* Check transition from GDesc access model:
1491 call *x@tlsdesc(%eax)
1492 */
1493 if (offset + 2 <= sec->size)
1494 {
1495 /* Make sure that it's a call *x@tlsdesc(%eax). */
1496 call = contents + offset;
1497 return call[0] == 0xff && call[1] == 0x10;
1498 }
1499
1500 return FALSE;
1501
1502 default:
1503 abort ();
1504 }
1505}
1506
1507/* Return TRUE if the TLS access transition is OK or no transition
1508 will be performed. Update R_TYPE if there is a transition. */
1509
1510static bfd_boolean
1511elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1512 asection *sec, bfd_byte *contents,
1513 Elf_Internal_Shdr *symtab_hdr,
1514 struct elf_link_hash_entry **sym_hashes,
1515 unsigned int *r_type, int tls_type,
1516 const Elf_Internal_Rela *rel,
1517 const Elf_Internal_Rela *relend,
1518 struct elf_link_hash_entry *h,
1519 unsigned long r_symndx,
1520 bfd_boolean from_relocate_section)
1521{
1522 unsigned int from_type = *r_type;
1523 unsigned int to_type = from_type;
1524 bfd_boolean check = TRUE;
1525
1526 /* Skip TLS transition for functions. */
1527 if (h != NULL
1528 && (h->type == STT_FUNC
1529 || h->type == STT_GNU_IFUNC))
1530 return TRUE;
1531
1532 switch (from_type)
1533 {
1534 case R_386_TLS_GD:
1535 case R_386_TLS_GOTDESC:
1536 case R_386_TLS_DESC_CALL:
1537 case R_386_TLS_IE_32:
1538 case R_386_TLS_IE:
1539 case R_386_TLS_GOTIE:
1540 if (bfd_link_executable (info))
1541 {
1542 if (h == NULL)
1543 to_type = R_386_TLS_LE_32;
1544 else if (from_type != R_386_TLS_IE
1545 && from_type != R_386_TLS_GOTIE)
1546 to_type = R_386_TLS_IE_32;
1547 }
1548
1549 /* When we are called from elf_i386_relocate_section, there may
1550 be additional transitions based on TLS_TYPE. */
1551 if (from_relocate_section)
1552 {
1553 unsigned int new_to_type = to_type;
1554
1555 if (bfd_link_executable (info)
1556 && h != NULL
1557 && h->dynindx == -1
1558 && (tls_type & GOT_TLS_IE))
1559 new_to_type = R_386_TLS_LE_32;
1560
1561 if (to_type == R_386_TLS_GD
1562 || to_type == R_386_TLS_GOTDESC
1563 || to_type == R_386_TLS_DESC_CALL)
1564 {
1565 if (tls_type == GOT_TLS_IE_POS)
1566 new_to_type = R_386_TLS_GOTIE;
1567 else if (tls_type & GOT_TLS_IE)
1568 new_to_type = R_386_TLS_IE_32;
1569 }
1570
1571 /* We checked the transition before when we were called from
1572 elf_i386_check_relocs. We only want to check the new
1573 transition which hasn't been checked before. */
1574 check = new_to_type != to_type && from_type == to_type;
1575 to_type = new_to_type;
1576 }
1577
1578 break;
1579
1580 case R_386_TLS_LDM:
1581 if (bfd_link_executable (info))
1582 to_type = R_386_TLS_LE_32;
1583 break;
1584
1585 default:
1586 return TRUE;
1587 }
1588
1589 /* Return TRUE if there is no transition. */
1590 if (from_type == to_type)
1591 return TRUE;
1592
1593 /* Check if the transition can be performed. */
1594 if (check
1595 && ! elf_i386_check_tls_transition (sec, contents,
1596 symtab_hdr, sym_hashes,
1597 from_type, rel, relend))
1598 {
1599 reloc_howto_type *from, *to;
1600 const char *name;
1601
1602 from = elf_i386_rtype_to_howto (abfd, from_type);
1603 to = elf_i386_rtype_to_howto (abfd, to_type);
1604
1605 if (h)
1606 name = h->root.root.string;
1607 else
1608 {
1609 struct elf_i386_link_hash_table *htab;
1610
1611 htab = elf_i386_hash_table (info);
1612 if (htab == NULL)
1613 name = "*unknown*";
1614 else
1615 {
1616 Elf_Internal_Sym *isym;
1617
1618 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1619 abfd, r_symndx);
1620 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1621 }
1622 }
1623
1624 _bfd_error_handler
1625 /* xgettext:c-format */
1626 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1627 "in section `%A' failed"),
1628 abfd, from->name, to->name, name,
1629 (unsigned long) rel->r_offset, sec);
1630 bfd_set_error (bfd_error_bad_value);
1631 return FALSE;
1632 }
1633
1634 *r_type = to_type;
1635 return TRUE;
1636}
1637
1638/* With the local symbol, foo, we convert
1639 mov foo@GOT[(%reg1)], %reg2
1640 to
1641 lea foo[@GOTOFF(%reg1)], %reg2
1642 and convert
1643 call/jmp *foo@GOT[(%reg)]
1644 to
1645 nop call foo/jmp foo nop
1646 When PIC is false, convert
1647 test %reg1, foo@GOT[(%reg2)]
1648 to
1649 test $foo, %reg1
1650 and convert
1651 binop foo@GOT[(%reg1)], %reg2
1652 to
1653 binop $foo, %reg2
1654 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1655 instructions. */
1656
1657static
1658bfd_boolean
1659elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1660 bfd_byte *contents,
1661 Elf_Internal_Rela *irel,
1662 struct elf_link_hash_entry *h,
1663 bfd_boolean *converted,
1664 struct bfd_link_info *link_info)
1665{
1666 struct elf_i386_link_hash_table *htab;
1667 unsigned int opcode;
1668 unsigned int modrm;
1669 bfd_boolean baseless;
1670 Elf_Internal_Sym *isym;
1671 unsigned int addend;
1672 unsigned int nop;
1673 bfd_vma nop_offset;
1674 bfd_boolean is_pic;
1675 bfd_boolean to_reloc_32;
1676 unsigned int r_type;
1677 unsigned int r_symndx;
1678 bfd_vma roff = irel->r_offset;
1679
1680 if (roff < 2)
1681 return TRUE;
1682
1683 /* Addend for R_386_GOT32X relocations must be 0. */
1684 addend = bfd_get_32 (abfd, contents + roff);
1685 if (addend != 0)
1686 return TRUE;
1687
1688 htab = elf_i386_hash_table (link_info);
1689 is_pic = bfd_link_pic (link_info);
1690
1691 r_type = ELF32_R_TYPE (irel->r_info);
1692 r_symndx = ELF32_R_SYM (irel->r_info);
1693
1694 modrm = bfd_get_8 (abfd, contents + roff - 1);
1695 baseless = (modrm & 0xc7) == 0x5;
1696
1697 if (baseless && is_pic)
1698 {
1699 /* For PIC, disallow R_386_GOT32X without a base register
1700 since we don't know what the GOT base is. */
1701 const char *name;
1702
1703 if (h == NULL)
1704 {
1705 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1706 r_symndx);
1707 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1708 }
1709 else
1710 name = h->root.root.string;
1711
1712 _bfd_error_handler
1713 /* xgettext:c-format */
1714 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1715 " register can not be used when making a shared object"),
1716 abfd, name);
1717 return FALSE;
1718 }
1719
1720 opcode = bfd_get_8 (abfd, contents + roff - 2);
1721
1722 /* Convert to R_386_32 if PIC is false or there is no base
1723 register. */
1724 to_reloc_32 = !is_pic || baseless;
1725
1726 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1727 reloc. */
1728 if (h == NULL)
1729 {
1730 if (opcode == 0x0ff)
1731 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1732 goto convert_branch;
1733 else
1734 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1735 "test %reg1, foo@GOT(%reg2)" and
1736 "binop foo@GOT[(%reg1)], %reg2". */
1737 goto convert_load;
1738 }
1739
1740 /* Undefined weak symbol is only bound locally in executable
1741 and its reference is resolved as 0. */
1742 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1743 elf_i386_hash_entry (h)))
1744 {
1745 if (opcode == 0xff)
1746 {
1747 /* No direct branch to 0 for PIC. */
1748 if (is_pic)
1749 return TRUE;
1750 else
1751 goto convert_branch;
1752 }
1753 else
1754 {
1755 /* We can convert load of address 0 to R_386_32. */
1756 to_reloc_32 = TRUE;
1757 goto convert_load;
1758 }
1759 }
1760
1761 if (opcode == 0xff)
1762 {
1763 /* We have "call/jmp *foo@GOT[(%reg)]". */
1764 if ((h->root.type == bfd_link_hash_defined
1765 || h->root.type == bfd_link_hash_defweak)
1766 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1767 {
1768 /* The function is locally defined. */
1769convert_branch:
1770 /* Convert R_386_GOT32X to R_386_PC32. */
1771 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1772 {
1773 struct elf_i386_link_hash_entry *eh
1774 = (struct elf_i386_link_hash_entry *) h;
1775
1776 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1777 is a nop prefix. */
1778 modrm = 0xe8;
1779 /* To support TLS optimization, always use addr32 prefix
1780 for "call *___tls_get_addr@GOT(%reg)". */
1781 if (eh && eh->tls_get_addr == 1)
1782 {
1783 nop = 0x67;
1784 nop_offset = irel->r_offset - 2;
1785 }
1786 else
1787 {
1788 nop = link_info->call_nop_byte;
1789 if (link_info->call_nop_as_suffix)
1790 {
1791 nop_offset = roff + 3;
1792 irel->r_offset -= 1;
1793 }
1794 else
1795 nop_offset = roff - 2;
1796 }
1797 }
1798 else
1799 {
1800 /* Convert to "jmp foo nop". */
1801 modrm = 0xe9;
1802 nop = NOP_OPCODE;
1803 nop_offset = roff + 3;
1804 irel->r_offset -= 1;
1805 }
1806
1807 bfd_put_8 (abfd, nop, contents + nop_offset);
1808 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1809 /* When converting to PC-relative relocation, we
1810 need to adjust addend by -4. */
1811 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1812 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1813
1814 *converted = TRUE;
1815 }
1816 }
1817 else
1818 {
1819 /* We have "mov foo@GOT[(%re1g)], %reg2",
1820 "test %reg1, foo@GOT(%reg2)" and
1821 "binop foo@GOT[(%reg1)], %reg2".
1822
1823 Avoid optimizing _DYNAMIC since ld.so may use its
1824 link-time address. */
1825 if (h == htab->elf.hdynamic)
1826 return TRUE;
1827
1828 /* def_regular is set by an assignment in a linker script in
1829 bfd_elf_record_link_assignment. */
1830 if ((h->def_regular
1831 || h->root.type == bfd_link_hash_defined
1832 || h->root.type == bfd_link_hash_defweak)
1833 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1834 {
1835convert_load:
1836 if (opcode == 0x8b)
1837 {
1838 if (to_reloc_32)
1839 {
1840 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1841 "mov $foo, %reg2" with R_386_32. */
1842 r_type = R_386_32;
1843 modrm = 0xc0 | (modrm & 0x38) >> 3;
1844 bfd_put_8 (abfd, modrm, contents + roff - 1);
1845 opcode = 0xc7;
1846 }
1847 else
1848 {
1849 /* Convert "mov foo@GOT(%reg1), %reg2" to
1850 "lea foo@GOTOFF(%reg1), %reg2". */
1851 r_type = R_386_GOTOFF;
1852 opcode = 0x8d;
1853 }
1854 }
1855 else
1856 {
1857 /* Only R_386_32 is supported. */
1858 if (!to_reloc_32)
1859 return TRUE;
1860
1861 if (opcode == 0x85)
1862 {
1863 /* Convert "test %reg1, foo@GOT(%reg2)" to
1864 "test $foo, %reg1". */
1865 modrm = 0xc0 | (modrm & 0x38) >> 3;
1866 opcode = 0xf7;
1867 }
1868 else
1869 {
1870 /* Convert "binop foo@GOT(%reg1), %reg2" to
1871 "binop $foo, %reg2". */
1872 modrm = (0xc0
1873 | (modrm & 0x38) >> 3
1874 | (opcode & 0x3c));
1875 opcode = 0x81;
1876 }
1877 bfd_put_8 (abfd, modrm, contents + roff - 1);
1878 r_type = R_386_32;
1879 }
1880
1881 bfd_put_8 (abfd, opcode, contents + roff - 2);
1882 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1883
1884 *converted = TRUE;
1885 }
1886 }
1887
1888 return TRUE;
1889}
1890
1891/* Rename some of the generic section flags to better document how they
1892 are used here. */
1893#define need_convert_load sec_flg0
1894#define check_relocs_failed sec_flg1
1895
1896/* Look through the relocs for a section during the first phase, and
1897 calculate needed space in the global offset table, procedure linkage
1898 table, and dynamic reloc sections. */
1899
1900static bfd_boolean
1901elf_i386_check_relocs (bfd *abfd,
1902 struct bfd_link_info *info,
1903 asection *sec,
1904 const Elf_Internal_Rela *relocs)
1905{
1906 struct elf_i386_link_hash_table *htab;
1907 Elf_Internal_Shdr *symtab_hdr;
1908 struct elf_link_hash_entry **sym_hashes;
1909 const Elf_Internal_Rela *rel;
1910 const Elf_Internal_Rela *rel_end;
1911 asection *sreloc;
1912 bfd_byte *contents;
1913
1914 if (bfd_link_relocatable (info))
1915 return TRUE;
1916
1917 /* Don't do anything special with non-loaded, non-alloced sections.
1918 In particular, any relocs in such sections should not affect GOT
1919 and PLT reference counting (ie. we don't allow them to create GOT
1920 or PLT entries), there's no possibility or desire to optimize TLS
1921 relocs, and there's not much point in propagating relocs to shared
1922 libs that the dynamic linker won't relocate. */
1923 if ((sec->flags & SEC_ALLOC) == 0)
1924 return TRUE;
1925
1926 BFD_ASSERT (is_i386_elf (abfd));
1927
1928 htab = elf_i386_hash_table (info);
1929 if (htab == NULL)
1930 {
1931 sec->check_relocs_failed = 1;
1932 return FALSE;
1933 }
1934
1935 /* Get the section contents. */
1936 if (elf_section_data (sec)->this_hdr.contents != NULL)
1937 contents = elf_section_data (sec)->this_hdr.contents;
1938 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1939 {
1940 sec->check_relocs_failed = 1;
1941 return FALSE;
1942 }
1943
1944 symtab_hdr = &elf_symtab_hdr (abfd);
1945 sym_hashes = elf_sym_hashes (abfd);
1946
1947 sreloc = NULL;
1948
1949 rel_end = relocs + sec->reloc_count;
1950 for (rel = relocs; rel < rel_end; rel++)
1951 {
1952 unsigned int r_type;
1953 unsigned long r_symndx;
1954 struct elf_link_hash_entry *h;
1955 struct elf_i386_link_hash_entry *eh;
1956 Elf_Internal_Sym *isym;
1957 const char *name;
1958 bfd_boolean size_reloc;
1959
1960 r_symndx = ELF32_R_SYM (rel->r_info);
1961 r_type = ELF32_R_TYPE (rel->r_info);
1962
1963 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1964 {
1965 /* xgettext:c-format */
1966 _bfd_error_handler (_("%B: bad symbol index: %d"),
1967 abfd, r_symndx);
1968 goto error_return;
1969 }
1970
1971 if (r_symndx < symtab_hdr->sh_info)
1972 {
1973 /* A local symbol. */
1974 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1975 abfd, r_symndx);
1976 if (isym == NULL)
1977 goto error_return;
1978
1979 /* Check relocation against local STT_GNU_IFUNC symbol. */
1980 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1981 {
1982 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1983 if (h == NULL)
1984 goto error_return;
1985
1986 /* Fake a STT_GNU_IFUNC symbol. */
1987 h->type = STT_GNU_IFUNC;
1988 h->def_regular = 1;
1989 h->ref_regular = 1;
1990 h->forced_local = 1;
1991 h->root.type = bfd_link_hash_defined;
1992 }
1993 else
1994 h = NULL;
1995 }
1996 else
1997 {
1998 isym = NULL;
1999 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2000 while (h->root.type == bfd_link_hash_indirect
2001 || h->root.type == bfd_link_hash_warning)
2002 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2003 }
2004
2005 eh = (struct elf_i386_link_hash_entry *) h;
2006 if (h != NULL)
2007 {
2008 switch (r_type)
2009 {
2010 default:
2011 break;
2012
2013 case R_386_GOTOFF:
2014 eh->gotoff_ref = 1;
2015 /* Fall through. */
2016 case R_386_32:
2017 case R_386_PC32:
2018 case R_386_PLT32:
2019 case R_386_GOT32:
2020 case R_386_GOT32X:
2021 if (htab->elf.dynobj == NULL)
2022 htab->elf.dynobj = abfd;
2023 /* Create the ifunc sections for static executables. */
2024 if (h->type == STT_GNU_IFUNC
2025 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
2026 info))
2027 goto error_return;
2028 break;
2029 }
2030
2031 /* It is referenced by a non-shared object. */
2032 h->ref_regular = 1;
2033 h->root.non_ir_ref = 1;
2034
2035 if (h->type == STT_GNU_IFUNC)
2036 elf_tdata (info->output_bfd)->has_gnu_symbols
2037 |= elf_gnu_symbol_ifunc;
2038 }
2039
2040 if (! elf_i386_tls_transition (info, abfd, sec, contents,
2041 symtab_hdr, sym_hashes,
2042 &r_type, GOT_UNKNOWN,
2043 rel, rel_end, h, r_symndx, FALSE))
2044 goto error_return;
2045
2046 switch (r_type)
2047 {
2048 case R_386_TLS_LDM:
2049 htab->tls_ldm_got.refcount += 1;
2050 goto create_got;
2051
2052 case R_386_PLT32:
2053 /* This symbol requires a procedure linkage table entry. We
2054 actually build the entry in adjust_dynamic_symbol,
2055 because this might be a case of linking PIC code which is
2056 never referenced by a dynamic object, in which case we
2057 don't need to generate a procedure linkage table entry
2058 after all. */
2059
2060 /* If this is a local symbol, we resolve it directly without
2061 creating a procedure linkage table entry. */
2062 if (h == NULL)
2063 continue;
2064
2065 eh->has_got_reloc = 1;
2066 h->needs_plt = 1;
2067 h->plt.refcount += 1;
2068 break;
2069
2070 case R_386_SIZE32:
2071 size_reloc = TRUE;
2072 goto do_size;
2073
2074 case R_386_TLS_IE_32:
2075 case R_386_TLS_IE:
2076 case R_386_TLS_GOTIE:
2077 if (!bfd_link_executable (info))
2078 info->flags |= DF_STATIC_TLS;
2079 /* Fall through */
2080
2081 case R_386_GOT32:
2082 case R_386_GOT32X:
2083 case R_386_TLS_GD:
2084 case R_386_TLS_GOTDESC:
2085 case R_386_TLS_DESC_CALL:
2086 /* This symbol requires a global offset table entry. */
2087 {
2088 int tls_type, old_tls_type;
2089
2090 switch (r_type)
2091 {
2092 default:
2093 case R_386_GOT32:
2094 case R_386_GOT32X:
2095 tls_type = GOT_NORMAL;
2096 break;
2097 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2098 case R_386_TLS_GOTDESC:
2099 case R_386_TLS_DESC_CALL:
2100 tls_type = GOT_TLS_GDESC; break;
2101 case R_386_TLS_IE_32:
2102 if (ELF32_R_TYPE (rel->r_info) == r_type)
2103 tls_type = GOT_TLS_IE_NEG;
2104 else
2105 /* If this is a GD->IE transition, we may use either of
2106 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2107 tls_type = GOT_TLS_IE;
2108 break;
2109 case R_386_TLS_IE:
2110 case R_386_TLS_GOTIE:
2111 tls_type = GOT_TLS_IE_POS; break;
2112 }
2113
2114 if (h != NULL)
2115 {
2116 h->got.refcount += 1;
2117 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2118 }
2119 else
2120 {
2121 bfd_signed_vma *local_got_refcounts;
2122
2123 /* This is a global offset table entry for a local symbol. */
2124 local_got_refcounts = elf_local_got_refcounts (abfd);
2125 if (local_got_refcounts == NULL)
2126 {
2127 bfd_size_type size;
2128
2129 size = symtab_hdr->sh_info;
2130 size *= (sizeof (bfd_signed_vma)
2131 + sizeof (bfd_vma) + sizeof(char));
2132 local_got_refcounts = (bfd_signed_vma *)
2133 bfd_zalloc (abfd, size);
2134 if (local_got_refcounts == NULL)
2135 goto error_return;
2136 elf_local_got_refcounts (abfd) = local_got_refcounts;
2137 elf_i386_local_tlsdesc_gotent (abfd)
2138 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2139 elf_i386_local_got_tls_type (abfd)
2140 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2141 }
2142 local_got_refcounts[r_symndx] += 1;
2143 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2144 }
2145
2146 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2147 tls_type |= old_tls_type;
2148 /* If a TLS symbol is accessed using IE at least once,
2149 there is no point to use dynamic model for it. */
2150 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2151 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2152 || (tls_type & GOT_TLS_IE) == 0))
2153 {
2154 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2155 tls_type = old_tls_type;
2156 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2157 && GOT_TLS_GD_ANY_P (tls_type))
2158 tls_type |= old_tls_type;
2159 else
2160 {
2161 if (h)
2162 name = h->root.root.string;
2163 else
2164 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2165 NULL);
2166 _bfd_error_handler
2167 /* xgettext:c-format */
2168 (_("%B: `%s' accessed both as normal and "
2169 "thread local symbol"),
2170 abfd, name);
2171 bfd_set_error (bfd_error_bad_value);
2172 goto error_return;
2173 }
2174 }
2175
2176 if (old_tls_type != tls_type)
2177 {
2178 if (h != NULL)
2179 elf_i386_hash_entry (h)->tls_type = tls_type;
2180 else
2181 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2182 }
2183 }
2184 /* Fall through */
2185
2186 case R_386_GOTOFF:
2187 case R_386_GOTPC:
2188 create_got:
2189 if (htab->elf.sgot == NULL)
2190 {
2191 if (htab->elf.dynobj == NULL)
2192 htab->elf.dynobj = abfd;
2193 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
2194 goto error_return;
2195 }
2196 if (r_type != R_386_TLS_IE)
2197 {
2198 if (eh != NULL)
2199 eh->has_got_reloc = 1;
2200 break;
2201 }
2202 /* Fall through */
2203
2204 case R_386_TLS_LE_32:
2205 case R_386_TLS_LE:
2206 if (eh != NULL)
2207 eh->has_got_reloc = 1;
2208 if (bfd_link_executable (info))
2209 break;
2210 info->flags |= DF_STATIC_TLS;
2211 goto do_relocation;
2212
2213 case R_386_32:
2214 case R_386_PC32:
2215 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2216 eh->has_non_got_reloc = 1;
2217do_relocation:
2218 /* We are called after all symbols have been resolved. Only
2219 relocation against STT_GNU_IFUNC symbol must go through
2220 PLT. */
2221 if (h != NULL
2222 && (bfd_link_executable (info)
2223 || h->type == STT_GNU_IFUNC))
2224 {
2225 /* If this reloc is in a read-only section, we might
2226 need a copy reloc. We can't check reliably at this
2227 stage whether the section is read-only, as input
2228 sections have not yet been mapped to output sections.
2229 Tentatively set the flag for now, and correct in
2230 adjust_dynamic_symbol. */
2231 h->non_got_ref = 1;
2232
2233 /* We may need a .plt entry if the symbol is a function
2234 defined in a shared lib or is a STT_GNU_IFUNC function
2235 referenced from the code or read-only section. */
2236 if (!h->def_regular
2237 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2238 h->plt.refcount += 1;
2239
2240 if (r_type == R_386_PC32)
2241 {
2242 /* Since something like ".long foo - ." may be used
2243 as pointer, make sure that PLT is used if foo is
2244 a function defined in a shared library. */
2245 if ((sec->flags & SEC_CODE) == 0)
2246 h->pointer_equality_needed = 1;
2247 else if (h->type == STT_GNU_IFUNC
2248 && bfd_link_pic (info))
2249 {
2250 if (isym == NULL)
2251 name = h->root.root.string;
2252 else
2253 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2254 NULL);
2255 _bfd_error_handler
2256 /* xgettext:c-format */
2257 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2258 abfd, name);
2259 bfd_set_error (bfd_error_bad_value);
2260 goto error_return;
2261 }
2262 }
2263 else
2264 {
2265 h->pointer_equality_needed = 1;
2266 /* R_386_32 can be resolved at run-time. */
2267 if (r_type == R_386_32
2268 && (sec->flags & SEC_READONLY) == 0)
2269 eh->func_pointer_refcount += 1;
2270 }
2271 }
2272
2273 size_reloc = FALSE;
2274do_size:
2275 /* If we are creating a shared library, and this is a reloc
2276 against a global symbol, or a non PC relative reloc
2277 against a local symbol, then we need to copy the reloc
2278 into the shared library. However, if we are linking with
2279 -Bsymbolic, we do not need to copy a reloc against a
2280 global symbol which is defined in an object we are
2281 including in the link (i.e., DEF_REGULAR is set). At
2282 this point we have not seen all the input files, so it is
2283 possible that DEF_REGULAR is not set now but will be set
2284 later (it is never cleared). In case of a weak definition,
2285 DEF_REGULAR may be cleared later by a strong definition in
2286 a shared library. We account for that possibility below by
2287 storing information in the relocs_copied field of the hash
2288 table entry. A similar situation occurs when creating
2289 shared libraries and symbol visibility changes render the
2290 symbol local.
2291
2292 If on the other hand, we are creating an executable, we
2293 may need to keep relocations for symbols satisfied by a
2294 dynamic library if we manage to avoid copy relocs for the
2295 symbol.
2296
2297 Generate dynamic pointer relocation against STT_GNU_IFUNC
2298 symbol in the non-code section. */
2299 if ((bfd_link_pic (info)
2300 && (r_type != R_386_PC32
2301 || (h != NULL
2302 && (! (bfd_link_pie (info)
2303 || SYMBOLIC_BIND (info, h))
2304 || h->root.type == bfd_link_hash_defweak
2305 || !h->def_regular))))
2306 || (h != NULL
2307 && h->type == STT_GNU_IFUNC
2308 && r_type == R_386_32
2309 && (sec->flags & SEC_CODE) == 0)
2310 || (ELIMINATE_COPY_RELOCS
2311 && !bfd_link_pic (info)
2312 && h != NULL
2313 && (h->root.type == bfd_link_hash_defweak
2314 || !h->def_regular)))
2315 {
2316 struct elf_dyn_relocs *p;
2317 struct elf_dyn_relocs **head;
2318
2319 /* We must copy these reloc types into the output file.
2320 Create a reloc section in dynobj and make room for
2321 this reloc. */
2322 if (sreloc == NULL)
2323 {
2324 if (htab->elf.dynobj == NULL)
2325 htab->elf.dynobj = abfd;
2326
2327 sreloc = _bfd_elf_make_dynamic_reloc_section
2328 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2329
2330 if (sreloc == NULL)
2331 goto error_return;
2332 }
2333
2334 /* If this is a global symbol, we count the number of
2335 relocations we need for this symbol. */
2336 if (h != NULL)
2337 {
2338 head = &eh->dyn_relocs;
2339 }
2340 else
2341 {
2342 /* Track dynamic relocs needed for local syms too.
2343 We really need local syms available to do this
2344 easily. Oh well. */
2345 void **vpp;
2346 asection *s;
2347
2348 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2349 abfd, r_symndx);
2350 if (isym == NULL)
2351 goto error_return;
2352
2353 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2354 if (s == NULL)
2355 s = sec;
2356
2357 vpp = &elf_section_data (s)->local_dynrel;
2358 head = (struct elf_dyn_relocs **)vpp;
2359 }
2360
2361 p = *head;
2362 if (p == NULL || p->sec != sec)
2363 {
2364 bfd_size_type amt = sizeof *p;
2365 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2366 amt);
2367 if (p == NULL)
2368 goto error_return;
2369 p->next = *head;
2370 *head = p;
2371 p->sec = sec;
2372 p->count = 0;
2373 p->pc_count = 0;
2374 }
2375
2376 p->count += 1;
2377 /* Count size relocation as PC-relative relocation. */
2378 if (r_type == R_386_PC32 || size_reloc)
2379 p->pc_count += 1;
2380 }
2381 break;
2382
2383 /* This relocation describes the C++ object vtable hierarchy.
2384 Reconstruct it for later use during GC. */
2385 case R_386_GNU_VTINHERIT:
2386 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2387 goto error_return;
2388 break;
2389
2390 /* This relocation describes which C++ vtable entries are actually
2391 used. Record for later use during GC. */
2392 case R_386_GNU_VTENTRY:
2393 BFD_ASSERT (h != NULL);
2394 if (h != NULL
2395 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2396 goto error_return;
2397 break;
2398
2399 default:
2400 break;
2401 }
2402
2403 if (r_type == R_386_GOT32X
2404 && (h == NULL || h->type != STT_GNU_IFUNC))
2405 sec->need_convert_load = 1;
2406 }
2407
2408 if (elf_section_data (sec)->this_hdr.contents != contents)
2409 {
2410 if (!info->keep_memory)
2411 free (contents);
2412 else
2413 {
2414 /* Cache the section contents for elf_link_input_bfd. */
2415 elf_section_data (sec)->this_hdr.contents = contents;
2416 }
2417 }
2418
2419 return TRUE;
2420
2421error_return:
2422 if (elf_section_data (sec)->this_hdr.contents != contents)
2423 free (contents);
2424 sec->check_relocs_failed = 1;
2425 return FALSE;
2426}
2427
2428/* Return the section that should be marked against GC for a given
2429 relocation. */
2430
2431static asection *
2432elf_i386_gc_mark_hook (asection *sec,
2433 struct bfd_link_info *info,
2434 Elf_Internal_Rela *rel,
2435 struct elf_link_hash_entry *h,
2436 Elf_Internal_Sym *sym)
2437{
2438 if (h != NULL)
2439 switch (ELF32_R_TYPE (rel->r_info))
2440 {
2441 case R_386_GNU_VTINHERIT:
2442 case R_386_GNU_VTENTRY:
2443 return NULL;
2444 }
2445
2446 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2447}
2448
2449/* Remove undefined weak symbol from the dynamic symbol table if it
2450 is resolved to 0. */
2451
2452static bfd_boolean
2453elf_i386_fixup_symbol (struct bfd_link_info *info,
2454 struct elf_link_hash_entry *h)
2455{
2456 if (h->dynindx != -1
2457 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2458 elf_i386_hash_entry (h)->has_got_reloc,
2459 elf_i386_hash_entry (h)))
2460 {
2461 h->dynindx = -1;
2462 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2463 h->dynstr_index);
2464 }
2465 return TRUE;
2466}
2467
2468/* Adjust a symbol defined by a dynamic object and referenced by a
2469 regular object. The current definition is in some section of the
2470 dynamic object, but we're not including those sections. We have to
2471 change the definition to something the rest of the link can
2472 understand. */
2473
2474static bfd_boolean
2475elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2476 struct elf_link_hash_entry *h)
2477{
2478 struct elf_i386_link_hash_table *htab;
2479 asection *s, *srel;
2480 struct elf_i386_link_hash_entry *eh;
2481 struct elf_dyn_relocs *p;
2482
2483 /* STT_GNU_IFUNC symbol must go through PLT. */
2484 if (h->type == STT_GNU_IFUNC)
2485 {
2486 /* All local STT_GNU_IFUNC references must be treate as local
2487 calls via local PLT. */
2488 if (h->ref_regular
2489 && SYMBOL_CALLS_LOCAL (info, h))
2490 {
2491 bfd_size_type pc_count = 0, count = 0;
2492 struct elf_dyn_relocs **pp;
2493
2494 eh = (struct elf_i386_link_hash_entry *) h;
2495 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2496 {
2497 pc_count += p->pc_count;
2498 p->count -= p->pc_count;
2499 p->pc_count = 0;
2500 count += p->count;
2501 if (p->count == 0)
2502 *pp = p->next;
2503 else
2504 pp = &p->next;
2505 }
2506
2507 if (pc_count || count)
2508 {
2509 h->non_got_ref = 1;
2510 if (pc_count)
2511 {
2512 /* Increment PLT reference count only for PC-relative
2513 references. */
2514 h->needs_plt = 1;
2515 if (h->plt.refcount <= 0)
2516 h->plt.refcount = 1;
2517 else
2518 h->plt.refcount += 1;
2519 }
2520 }
2521 }
2522
2523 if (h->plt.refcount <= 0)
2524 {
2525 h->plt.offset = (bfd_vma) -1;
2526 h->needs_plt = 0;
2527 }
2528 return TRUE;
2529 }
2530
2531 /* If this is a function, put it in the procedure linkage table. We
2532 will fill in the contents of the procedure linkage table later,
2533 when we know the address of the .got section. */
2534 if (h->type == STT_FUNC
2535 || h->needs_plt)
2536 {
2537 if (h->plt.refcount <= 0
2538 || SYMBOL_CALLS_LOCAL (info, h)
2539 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2540 && h->root.type == bfd_link_hash_undefweak))
2541 {
2542 /* This case can occur if we saw a PLT32 reloc in an input
2543 file, but the symbol was never referred to by a dynamic
2544 object, or if all references were garbage collected. In
2545 such a case, we don't actually need to build a procedure
2546 linkage table, and we can just do a PC32 reloc instead. */
2547 h->plt.offset = (bfd_vma) -1;
2548 h->needs_plt = 0;
2549 }
2550
2551 return TRUE;
2552 }
2553 else
2554 /* It's possible that we incorrectly decided a .plt reloc was
2555 needed for an R_386_PC32 reloc to a non-function sym in
2556 check_relocs. We can't decide accurately between function and
2557 non-function syms in check-relocs; Objects loaded later in
2558 the link may change h->type. So fix it now. */
2559 h->plt.offset = (bfd_vma) -1;
2560
2561 /* If this is a weak symbol, and there is a real definition, the
2562 processor independent code will have arranged for us to see the
2563 real definition first, and we can just use the same value. */
2564 if (h->u.weakdef != NULL)
2565 {
2566 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2567 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2568 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2569 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2570 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2571 h->non_got_ref = h->u.weakdef->non_got_ref;
2572 return TRUE;
2573 }
2574
2575 /* This is a reference to a symbol defined by a dynamic object which
2576 is not a function. */
2577
2578 /* If we are creating a shared library, we must presume that the
2579 only references to the symbol are via the global offset table.
2580 For such cases we need not do anything here; the relocations will
2581 be handled correctly by relocate_section. */
2582 if (!bfd_link_executable (info))
2583 return TRUE;
2584
2585 /* If there are no references to this symbol that do not use the
2586 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2587 reloc. */
2588 eh = (struct elf_i386_link_hash_entry *) h;
2589 if (!h->non_got_ref && !eh->gotoff_ref)
2590 return TRUE;
2591
2592 /* If -z nocopyreloc was given, we won't generate them either. */
2593 if (info->nocopyreloc)
2594 {
2595 h->non_got_ref = 0;
2596 return TRUE;
2597 }
2598
2599 htab = elf_i386_hash_table (info);
2600 if (htab == NULL)
2601 return FALSE;
2602
2603 /* If there aren't any dynamic relocs in read-only sections nor
2604 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2605 avoid the copy reloc. This doesn't work on VxWorks, where we can
2606 not have dynamic relocations (other than copy and jump slot
2607 relocations) in an executable. */
2608 if (ELIMINATE_COPY_RELOCS
2609 && !eh->gotoff_ref
2610 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2611 {
2612 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2613 {
2614 s = p->sec->output_section;
2615 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2616 break;
2617 }
2618
2619 if (p == NULL)
2620 {
2621 h->non_got_ref = 0;
2622 return TRUE;
2623 }
2624 }
2625
2626 /* We must allocate the symbol in our .dynbss section, which will
2627 become part of the .bss section of the executable. There will be
2628 an entry for this symbol in the .dynsym section. The dynamic
2629 object will contain position independent code, so all references
2630 from the dynamic object to this symbol will go through the global
2631 offset table. The dynamic linker will use the .dynsym entry to
2632 determine the address it must put in the global offset table, so
2633 both the dynamic object and the regular object will refer to the
2634 same memory location for the variable. */
2635
2636 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2637 copy the initial value out of the dynamic object and into the
2638 runtime process image. */
2639 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2640 {
2641 s = htab->elf.sdynrelro;
2642 srel = htab->elf.sreldynrelro;
2643 }
2644 else
2645 {
2646 s = htab->elf.sdynbss;
2647 srel = htab->elf.srelbss;
2648 }
2649 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2650 {
2651 srel->size += sizeof (Elf32_External_Rel);
2652 h->needs_copy = 1;
2653 }
2654
2655 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2656}
2657
2658/* Allocate space in .plt, .got and associated reloc sections for
2659 dynamic relocs. */
2660
2661static bfd_boolean
2662elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2663{
2664 struct bfd_link_info *info;
2665 struct elf_i386_link_hash_table *htab;
2666 struct elf_i386_link_hash_entry *eh;
2667 struct elf_dyn_relocs *p;
2668 unsigned plt_entry_size;
2669 bfd_boolean resolved_to_zero;
2670
2671 if (h->root.type == bfd_link_hash_indirect)
2672 return TRUE;
2673
2674 eh = (struct elf_i386_link_hash_entry *) h;
2675
2676 info = (struct bfd_link_info *) inf;
2677 htab = elf_i386_hash_table (info);
2678 if (htab == NULL)
2679 return FALSE;
2680
2681 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2682
2683 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2684 eh->has_got_reloc,
2685 eh);
2686
2687 /* Clear the reference count of function pointer relocations if
2688 symbol isn't a normal function. */
2689 if (h->type != STT_FUNC)
2690 eh->func_pointer_refcount = 0;
2691
2692 /* We can't use the GOT PLT if pointer equality is needed since
2693 finish_dynamic_symbol won't clear symbol value and the dynamic
2694 linker won't update the GOT slot. We will get into an infinite
2695 loop at run-time. */
2696 if (htab->plt_got != NULL
2697 && h->type != STT_GNU_IFUNC
2698 && !h->pointer_equality_needed
2699 && h->plt.refcount > 0
2700 && h->got.refcount > 0)
2701 {
2702 /* Don't use the regular PLT if there are both GOT and GOTPLT
2703 reloctions. */
2704 h->plt.offset = (bfd_vma) -1;
2705
2706 /* Use the GOT PLT. */
2707 eh->plt_got.refcount = 1;
2708 }
2709
2710 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2711 here if it is defined and referenced in a non-shared object. */
2712 if (h->type == STT_GNU_IFUNC
2713 && h->def_regular)
2714 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2715 &htab->readonly_dynrelocs_against_ifunc,
2716 plt_entry_size,
2717 plt_entry_size, 4, TRUE);
2718 /* Don't create the PLT entry if there are only function pointer
2719 relocations which can be resolved at run-time. */
2720 else if (htab->elf.dynamic_sections_created
2721 && (h->plt.refcount > eh->func_pointer_refcount
2722 || eh->plt_got.refcount > 0))
2723 {
2724 bfd_boolean use_plt_got;
2725
2726 /* Clear the reference count of function pointer relocations
2727 if PLT is used. */
2728 eh->func_pointer_refcount = 0;
2729
2730 if (htab->plt_got != NULL
2731 && (info->flags & DF_BIND_NOW)
2732 && !h->pointer_equality_needed)
2733 {
2734 /* Don't use the regular PLT for DF_BIND_NOW. */
2735 h->plt.offset = (bfd_vma) -1;
2736
2737 /* Use the GOT PLT. */
2738 h->got.refcount = 1;
2739 eh->plt_got.refcount = 1;
2740 }
2741
2742 use_plt_got = eh->plt_got.refcount > 0;
2743
2744 /* Make sure this symbol is output as a dynamic symbol.
2745 Undefined weak syms won't yet be marked as dynamic. */
2746 if (h->dynindx == -1
2747 && !h->forced_local
2748 && !resolved_to_zero
2749 && h->root.type == bfd_link_hash_undefweak)
2750 {
2751 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2752 return FALSE;
2753 }
2754
2755 if (bfd_link_pic (info)
2756 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2757 {
2758 asection *s = htab->elf.splt;
2759 asection *got_s = htab->plt_got;
2760
2761 /* If this is the first .plt entry, make room for the special
2762 first entry. The .plt section is used by prelink to undo
2763 prelinking for dynamic relocations. */
2764 if (s->size == 0)
2765 s->size = plt_entry_size;
2766
2767 if (use_plt_got)
2768 eh->plt_got.offset = got_s->size;
2769 else
2770 h->plt.offset = s->size;
2771
2772 /* If this symbol is not defined in a regular file, and we are
2773 not generating a shared library, then set the symbol to this
2774 location in the .plt. This is required to make function
2775 pointers compare as equal between the normal executable and
2776 the shared library. */
2777 if (! bfd_link_pic (info)
2778 && !h->def_regular)
2779 {
2780 if (use_plt_got)
2781 {
2782 /* We need to make a call to the entry of the GOT PLT
2783 instead of regular PLT entry. */
2784 h->root.u.def.section = got_s;
2785 h->root.u.def.value = eh->plt_got.offset;
2786 }
2787 else
2788 {
2789 h->root.u.def.section = s;
2790 h->root.u.def.value = h->plt.offset;
2791 }
2792 }
2793
2794 /* Make room for this entry. */
2795 if (use_plt_got)
2796 got_s->size += sizeof (elf_i386_got_plt_entry);
2797 else
2798 {
2799 s->size += plt_entry_size;
2800
2801 /* We also need to make an entry in the .got.plt section,
2802 which will be placed in the .got section by the linker
2803 script. */
2804 htab->elf.sgotplt->size += 4;
2805
2806 /* There should be no PLT relocation against resolved
2807 undefined weak symbol in executable. */
2808 if (!resolved_to_zero)
2809 {
2810 /* We also need to make an entry in the .rel.plt
2811 section. */
2812 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2813 htab->elf.srelplt->reloc_count++;
2814 }
2815 }
2816
2817 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2818 && !bfd_link_pic (info))
2819 {
2820 /* VxWorks has a second set of relocations for each PLT entry
2821 in executables. They go in a separate relocation section,
2822 which is processed by the kernel loader. */
2823
2824 /* There are two relocations for the initial PLT entry: an
2825 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2826 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2827
2828 if (h->plt.offset == plt_entry_size)
2829 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2830
2831 /* There are two extra relocations for each subsequent PLT entry:
2832 an R_386_32 relocation for the GOT entry, and an R_386_32
2833 relocation for the PLT entry. */
2834
2835 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2836 }
2837 }
2838 else
2839 {
2840 eh->plt_got.offset = (bfd_vma) -1;
2841 h->plt.offset = (bfd_vma) -1;
2842 h->needs_plt = 0;
2843 }
2844 }
2845 else
2846 {
2847 eh->plt_got.offset = (bfd_vma) -1;
2848 h->plt.offset = (bfd_vma) -1;
2849 h->needs_plt = 0;
2850 }
2851
2852 eh->tlsdesc_got = (bfd_vma) -1;
2853
2854 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2855 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2856 if (h->got.refcount > 0
2857 && bfd_link_executable (info)
2858 && h->dynindx == -1
2859 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2860 h->got.offset = (bfd_vma) -1;
2861 else if (h->got.refcount > 0)
2862 {
2863 asection *s;
2864 bfd_boolean dyn;
2865 int tls_type = elf_i386_hash_entry(h)->tls_type;
2866
2867 /* Make sure this symbol is output as a dynamic symbol.
2868 Undefined weak syms won't yet be marked as dynamic. */
2869 if (h->dynindx == -1
2870 && !h->forced_local
2871 && !resolved_to_zero
2872 && h->root.type == bfd_link_hash_undefweak)
2873 {
2874 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2875 return FALSE;
2876 }
2877
2878 s = htab->elf.sgot;
2879 if (GOT_TLS_GDESC_P (tls_type))
2880 {
2881 eh->tlsdesc_got = htab->elf.sgotplt->size
2882 - elf_i386_compute_jump_table_size (htab);
2883 htab->elf.sgotplt->size += 8;
2884 h->got.offset = (bfd_vma) -2;
2885 }
2886 if (! GOT_TLS_GDESC_P (tls_type)
2887 || GOT_TLS_GD_P (tls_type))
2888 {
2889 h->got.offset = s->size;
2890 s->size += 4;
2891 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2892 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2893 s->size += 4;
2894 }
2895 dyn = htab->elf.dynamic_sections_created;
2896 /* R_386_TLS_IE_32 needs one dynamic relocation,
2897 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2898 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2899 need two), R_386_TLS_GD needs one if local symbol and two if
2900 global. No dynamic relocation against resolved undefined weak
2901 symbol in executable. */
2902 if (tls_type == GOT_TLS_IE_BOTH)
2903 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2904 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2905 || (tls_type & GOT_TLS_IE))
2906 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2907 else if (GOT_TLS_GD_P (tls_type))
2908 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2909 else if (! GOT_TLS_GDESC_P (tls_type)
2910 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2911 && !resolved_to_zero)
2912 || h->root.type != bfd_link_hash_undefweak)
2913 && (bfd_link_pic (info)
2914 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2915 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2916 if (GOT_TLS_GDESC_P (tls_type))
2917 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2918 }
2919 else
2920 h->got.offset = (bfd_vma) -1;
2921
2922 if (eh->dyn_relocs == NULL)
2923 return TRUE;
2924
2925 /* In the shared -Bsymbolic case, discard space allocated for
2926 dynamic pc-relative relocs against symbols which turn out to be
2927 defined in regular objects. For the normal shared case, discard
2928 space for pc-relative relocs that have become local due to symbol
2929 visibility changes. */
2930
2931 if (bfd_link_pic (info))
2932 {
2933 /* The only reloc that uses pc_count is R_386_PC32, which will
2934 appear on a call or on something like ".long foo - .". We
2935 want calls to protected symbols to resolve directly to the
2936 function rather than going via the plt. If people want
2937 function pointer comparisons to work as expected then they
2938 should avoid writing assembly like ".long foo - .". */
2939 if (SYMBOL_CALLS_LOCAL (info, h))
2940 {
2941 struct elf_dyn_relocs **pp;
2942
2943 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2944 {
2945 p->count -= p->pc_count;
2946 p->pc_count = 0;
2947 if (p->count == 0)
2948 *pp = p->next;
2949 else
2950 pp = &p->next;
2951 }
2952 }
2953
2954 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2955 {
2956 struct elf_dyn_relocs **pp;
2957 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2958 {
2959 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2960 *pp = p->next;
2961 else
2962 pp = &p->next;
2963 }
2964 }
2965
2966 /* Also discard relocs on undefined weak syms with non-default
2967 visibility or in PIE. */
2968 if (eh->dyn_relocs != NULL
2969 && h->root.type == bfd_link_hash_undefweak)
2970 {
2971 /* Undefined weak symbol is never bound locally in shared
2972 library. */
2973 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2974 || resolved_to_zero)
2975 {
2976 if (h->non_got_ref)
2977 {
2978 /* Keep dynamic non-GOT/non-PLT relocation so that we
2979 can branch to 0 without PLT. */
2980 struct elf_dyn_relocs **pp;
2981
2982 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2983 if (p->pc_count == 0)
2984 *pp = p->next;
2985 else
2986 {
2987 /* Remove non-R_386_PC32 relocation. */
2988 p->count = p->pc_count;
2989 pp = &p->next;
2990 }
2991
2992 if (eh->dyn_relocs != NULL)
2993 {
2994 /* Make sure undefined weak symbols are output
2995 as dynamic symbols in PIEs for dynamic non-GOT
2996 non-PLT reloations. */
2997 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2998 return FALSE;
2999 }
3000 }
3001 else
3002 eh->dyn_relocs = NULL;
3003 }
3004 else if (h->dynindx == -1
3005 && !h->forced_local)
3006 {
3007 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3008 return FALSE;
3009 }
3010 }
3011 }
3012 else if (ELIMINATE_COPY_RELOCS)
3013 {
3014 /* For the non-shared case, discard space for relocs against
3015 symbols which turn out to need copy relocs or are not
3016 dynamic. Keep dynamic relocations for run-time function
3017 pointer initialization. */
3018
3019 if ((!h->non_got_ref
3020 || eh->func_pointer_refcount > 0
3021 || (h->root.type == bfd_link_hash_undefweak
3022 && !resolved_to_zero))
3023 && ((h->def_dynamic
3024 && !h->def_regular)
3025 || (htab->elf.dynamic_sections_created
3026 && (h->root.type == bfd_link_hash_undefweak
3027 || h->root.type == bfd_link_hash_undefined))))
3028 {
3029 /* Make sure this symbol is output as a dynamic symbol.
3030 Undefined weak syms won't yet be marked as dynamic. */
3031 if (h->dynindx == -1
3032 && !h->forced_local
3033 && !resolved_to_zero
3034 && h->root.type == bfd_link_hash_undefweak)
3035 {
3036 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3037 return FALSE;
3038 }
3039
3040 /* If that succeeded, we know we'll be keeping all the
3041 relocs. */
3042 if (h->dynindx != -1)
3043 goto keep;
3044 }
3045
3046 eh->dyn_relocs = NULL;
3047 eh->func_pointer_refcount = 0;
3048
3049 keep: ;
3050 }
3051
3052 /* Finally, allocate space. */
3053 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3054 {
3055 asection *sreloc;
3056
3057 sreloc = elf_section_data (p->sec)->sreloc;
3058
3059 BFD_ASSERT (sreloc != NULL);
3060 sreloc->size += p->count * sizeof (Elf32_External_Rel);
3061 }
3062
3063 return TRUE;
3064}
3065
3066/* Allocate space in .plt, .got and associated reloc sections for
3067 local dynamic relocs. */
3068
3069static bfd_boolean
3070elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
3071{
3072 struct elf_link_hash_entry *h
3073 = (struct elf_link_hash_entry *) *slot;
3074
3075 if (h->type != STT_GNU_IFUNC
3076 || !h->def_regular
3077 || !h->ref_regular
3078 || !h->forced_local
3079 || h->root.type != bfd_link_hash_defined)
3080 abort ();
3081
3082 return elf_i386_allocate_dynrelocs (h, inf);
3083}
3084
3085/* Find any dynamic relocs that apply to read-only sections. */
3086
3087static bfd_boolean
3088elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3089{
3090 struct elf_i386_link_hash_entry *eh;
3091 struct elf_dyn_relocs *p;
3092
3093 /* Skip local IFUNC symbols. */
3094 if (h->forced_local && h->type == STT_GNU_IFUNC)
3095 return TRUE;
3096
3097 eh = (struct elf_i386_link_hash_entry *) h;
3098 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3099 {
3100 asection *s = p->sec->output_section;
3101
3102 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3103 {
3104 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3105
3106 info->flags |= DF_TEXTREL;
3107
3108 if ((info->warn_shared_textrel && bfd_link_pic (info))
3109 || info->error_textrel)
3110 /* xgettext:c-format */
3111 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3112 p->sec->owner, h->root.root.string,
3113 p->sec);
3114
3115 /* Not an error, just cut short the traversal. */
3116 return FALSE;
3117 }
3118 }
3119 return TRUE;
3120}
3121
3122/* Convert load via the GOT slot to load immediate. */
3123
3124static bfd_boolean
3125elf_i386_convert_load (bfd *abfd, asection *sec,
3126 struct bfd_link_info *link_info)
3127{
3128 struct elf_i386_link_hash_table *htab;
3129 Elf_Internal_Shdr *symtab_hdr;
3130 Elf_Internal_Rela *internal_relocs;
3131 Elf_Internal_Rela *irel, *irelend;
3132 bfd_byte *contents;
3133 bfd_boolean changed;
3134 bfd_signed_vma *local_got_refcounts;
3135
3136 /* Don't even try to convert non-ELF outputs. */
3137 if (!is_elf_hash_table (link_info->hash))
3138 return FALSE;
3139
3140 /* Nothing to do if there is no need or no output. */
3141 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3142 || sec->need_convert_load == 0
3143 || bfd_is_abs_section (sec->output_section))
3144 return TRUE;
3145
3146 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3147
3148 /* Load the relocations for this section. */
3149 internal_relocs = (_bfd_elf_link_read_relocs
3150 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3151 link_info->keep_memory));
3152 if (internal_relocs == NULL)
3153 return FALSE;
3154
3155 changed = FALSE;
3156 htab = elf_i386_hash_table (link_info);
3157 local_got_refcounts = elf_local_got_refcounts (abfd);
3158
3159 /* Get the section contents. */
3160 if (elf_section_data (sec)->this_hdr.contents != NULL)
3161 contents = elf_section_data (sec)->this_hdr.contents;
3162 else
3163 {
3164 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3165 goto error_return;
3166 }
3167
3168 irelend = internal_relocs + sec->reloc_count;
3169 for (irel = internal_relocs; irel < irelend; irel++)
3170 {
3171 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3172 unsigned int r_symndx;
3173 struct elf_link_hash_entry *h;
3174 bfd_boolean converted;
3175
3176 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3177 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3178 if (r_type != R_386_GOT32X)
3179 continue;
3180
3181 r_symndx = ELF32_R_SYM (irel->r_info);
3182 if (r_symndx < symtab_hdr->sh_info)
3183 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3184 (const Elf_Internal_Rela *) irel,
3185 FALSE);
3186 else
3187 {
3188 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3189 while (h->root.type == bfd_link_hash_indirect
3190 || h->root.type == bfd_link_hash_warning)
3191 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3192 }
3193
3194 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3195 if (h != NULL && h->type == STT_GNU_IFUNC)
3196 continue;
3197
3198 converted = FALSE;
3199 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3200 irel, h, &converted, link_info))
3201 goto error_return;
3202
3203 if (converted)
3204 {
3205 changed = converted;
3206 if (h)
3207 {
3208 if (h->got.refcount > 0)
3209 h->got.refcount -= 1;
3210 }
3211 else
3212 {
3213 if (local_got_refcounts != NULL
3214 && local_got_refcounts[r_symndx] > 0)
3215 local_got_refcounts[r_symndx] -= 1;
3216 }
3217 }
3218 }
3219
3220 if (contents != NULL
3221 && elf_section_data (sec)->this_hdr.contents != contents)
3222 {
3223 if (!changed && !link_info->keep_memory)
3224 free (contents);
3225 else
3226 {
3227 /* Cache the section contents for elf_link_input_bfd. */
3228 elf_section_data (sec)->this_hdr.contents = contents;
3229 }
3230 }
3231
3232 if (elf_section_data (sec)->relocs != internal_relocs)
3233 {
3234 if (!changed)
3235 free (internal_relocs);
3236 else
3237 elf_section_data (sec)->relocs = internal_relocs;
3238 }
3239
3240 return TRUE;
3241
3242 error_return:
3243 if (contents != NULL
3244 && elf_section_data (sec)->this_hdr.contents != contents)
3245 free (contents);
3246 if (internal_relocs != NULL
3247 && elf_section_data (sec)->relocs != internal_relocs)
3248 free (internal_relocs);
3249 return FALSE;
3250}
3251
3252/* Set the sizes of the dynamic sections. */
3253
3254static bfd_boolean
3255elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3256{
3257 struct elf_i386_link_hash_table *htab;
3258 bfd *dynobj;
3259 asection *s;
3260 bfd_boolean relocs;
3261 bfd *ibfd;
3262
3263 htab = elf_i386_hash_table (info);
3264 if (htab == NULL)
3265 return FALSE;
3266 dynobj = htab->elf.dynobj;
3267 if (dynobj == NULL)
3268 abort ();
3269
3270 /* Set up .got offsets for local syms, and space for local dynamic
3271 relocs. */
3272 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3273 {
3274 bfd_signed_vma *local_got;
3275 bfd_signed_vma *end_local_got;
3276 char *local_tls_type;
3277 bfd_vma *local_tlsdesc_gotent;
3278 bfd_size_type locsymcount;
3279 Elf_Internal_Shdr *symtab_hdr;
3280 asection *srel;
3281
3282 if (! is_i386_elf (ibfd))
3283 continue;
3284
3285 for (s = ibfd->sections; s != NULL; s = s->next)
3286 {
3287 struct elf_dyn_relocs *p;
3288
3289 if (!elf_i386_convert_load (ibfd, s, info))
3290 return FALSE;
3291
3292 for (p = ((struct elf_dyn_relocs *)
3293 elf_section_data (s)->local_dynrel);
3294 p != NULL;
3295 p = p->next)
3296 {
3297 if (!bfd_is_abs_section (p->sec)
3298 && bfd_is_abs_section (p->sec->output_section))
3299 {
3300 /* Input section has been discarded, either because
3301 it is a copy of a linkonce section or due to
3302 linker script /DISCARD/, so we'll be discarding
3303 the relocs too. */
3304 }
3305 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3306 && strcmp (p->sec->output_section->name,
3307 ".tls_vars") == 0)
3308 {
3309 /* Relocations in vxworks .tls_vars sections are
3310 handled specially by the loader. */
3311 }
3312 else if (p->count != 0)
3313 {
3314 srel = elf_section_data (p->sec)->sreloc;
3315 srel->size += p->count * sizeof (Elf32_External_Rel);
3316 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3317 && (info->flags & DF_TEXTREL) == 0)
3318 {
3319 info->flags |= DF_TEXTREL;
3320 if ((info->warn_shared_textrel && bfd_link_pic (info))
3321 || info->error_textrel)
3322 /* xgettext:c-format */
3323 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3324 p->sec->owner, p->sec);
3325 }
3326 }
3327 }
3328 }
3329
3330 local_got = elf_local_got_refcounts (ibfd);
3331 if (!local_got)
3332 continue;
3333
3334 symtab_hdr = &elf_symtab_hdr (ibfd);
3335 locsymcount = symtab_hdr->sh_info;
3336 end_local_got = local_got + locsymcount;
3337 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3338 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3339 s = htab->elf.sgot;
3340 srel = htab->elf.srelgot;
3341 for (; local_got < end_local_got;
3342 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3343 {
3344 *local_tlsdesc_gotent = (bfd_vma) -1;
3345 if (*local_got > 0)
3346 {
3347 if (GOT_TLS_GDESC_P (*local_tls_type))
3348 {
3349 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3350 - elf_i386_compute_jump_table_size (htab);
3351 htab->elf.sgotplt->size += 8;
3352 *local_got = (bfd_vma) -2;
3353 }
3354 if (! GOT_TLS_GDESC_P (*local_tls_type)
3355 || GOT_TLS_GD_P (*local_tls_type))
3356 {
3357 *local_got = s->size;
3358 s->size += 4;
3359 if (GOT_TLS_GD_P (*local_tls_type)
3360 || *local_tls_type == GOT_TLS_IE_BOTH)
3361 s->size += 4;
3362 }
3363 if (bfd_link_pic (info)
3364 || GOT_TLS_GD_ANY_P (*local_tls_type)
3365 || (*local_tls_type & GOT_TLS_IE))
3366 {
3367 if (*local_tls_type == GOT_TLS_IE_BOTH)
3368 srel->size += 2 * sizeof (Elf32_External_Rel);
3369 else if (GOT_TLS_GD_P (*local_tls_type)
3370 || ! GOT_TLS_GDESC_P (*local_tls_type))
3371 srel->size += sizeof (Elf32_External_Rel);
3372 if (GOT_TLS_GDESC_P (*local_tls_type))
3373 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3374 }
3375 }
3376 else
3377 *local_got = (bfd_vma) -1;
3378 }
3379 }
3380
3381 if (htab->tls_ldm_got.refcount > 0)
3382 {
3383 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3384 relocs. */
3385 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3386 htab->elf.sgot->size += 8;
3387 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3388 }
3389 else
3390 htab->tls_ldm_got.offset = -1;
3391
3392 /* Allocate global sym .plt and .got entries, and space for global
3393 sym dynamic relocs. */
3394 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3395
3396 /* Allocate .plt and .got entries, and space for local symbols. */
3397 htab_traverse (htab->loc_hash_table,
3398 elf_i386_allocate_local_dynrelocs,
3399 info);
3400
3401 /* For every jump slot reserved in the sgotplt, reloc_count is
3402 incremented. However, when we reserve space for TLS descriptors,
3403 it's not incremented, so in order to compute the space reserved
3404 for them, it suffices to multiply the reloc count by the jump
3405 slot size.
3406
3407 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3408 so that R_386_IRELATIVE entries come last. */
3409 if (htab->elf.srelplt)
3410 {
3411 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3412 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3413 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3414 }
3415 else if (htab->elf.irelplt)
3416 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3417
3418
3419 if (htab->elf.sgotplt)
3420 {
3421 /* Don't allocate .got.plt section if there are no GOT nor PLT
3422 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3423 if ((htab->elf.hgot == NULL
3424 || !htab->elf.hgot->ref_regular_nonweak)
3425 && (htab->elf.sgotplt->size
3426 == get_elf_backend_data (output_bfd)->got_header_size)
3427 && (htab->elf.splt == NULL
3428 || htab->elf.splt->size == 0)
3429 && (htab->elf.sgot == NULL
3430 || htab->elf.sgot->size == 0)
3431 && (htab->elf.iplt == NULL
3432 || htab->elf.iplt->size == 0)
3433 && (htab->elf.igotplt == NULL
3434 || htab->elf.igotplt->size == 0))
3435 htab->elf.sgotplt->size = 0;
3436 }
3437
3438 if (_bfd_elf_eh_frame_present (info))
3439 {
3440 if (htab->plt_eh_frame != NULL
3441 && htab->elf.splt != NULL
3442 && htab->elf.splt->size != 0
3443 && !bfd_is_abs_section (htab->elf.splt->output_section))
3444 htab->plt_eh_frame->size
3445 = get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_size;
3446
3447 if (htab->plt_got_eh_frame != NULL
3448 && htab->plt_got != NULL
3449 && htab->plt_got->size != 0
3450 && !bfd_is_abs_section (htab->plt_got->output_section))
3451 htab->plt_got_eh_frame->size
3452 = get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_got_size;
3453 }
3454
3455 /* We now have determined the sizes of the various dynamic sections.
3456 Allocate memory for them. */
3457 relocs = FALSE;
3458 for (s = dynobj->sections; s != NULL; s = s->next)
3459 {
3460 bfd_boolean strip_section = TRUE;
3461
3462 if ((s->flags & SEC_LINKER_CREATED) == 0)
3463 continue;
3464
3465 if (s == htab->elf.splt
3466 || s == htab->elf.sgot)
3467 {
3468 /* Strip this section if we don't need it; see the
3469 comment below. */
3470 /* We'd like to strip these sections if they aren't needed, but if
3471 we've exported dynamic symbols from them we must leave them.
3472 It's too late to tell BFD to get rid of the symbols. */
3473
3474 if (htab->elf.hplt != NULL)
3475 strip_section = FALSE;
3476 }
3477 else if (s == htab->elf.sgotplt
3478 || s == htab->elf.iplt
3479 || s == htab->elf.igotplt
3480 || s == htab->plt_got
3481 || s == htab->plt_eh_frame
3482 || s == htab->plt_got_eh_frame
3483 || s == htab->elf.sdynbss
3484 || s == htab->elf.sdynrelro)
3485 {
3486 /* Strip these too. */
3487 }
3488 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3489 {
3490 if (s->size != 0
3491 && s != htab->elf.srelplt
3492 && s != htab->srelplt2)
3493 relocs = TRUE;
3494
3495 /* We use the reloc_count field as a counter if we need
3496 to copy relocs into the output file. */
3497 s->reloc_count = 0;
3498 }
3499 else
3500 {
3501 /* It's not one of our sections, so don't allocate space. */
3502 continue;
3503 }
3504
3505 if (s->size == 0)
3506 {
3507 /* If we don't need this section, strip it from the
3508 output file. This is mostly to handle .rel.bss and
3509 .rel.plt. We must create both sections in
3510 create_dynamic_sections, because they must be created
3511 before the linker maps input sections to output
3512 sections. The linker does that before
3513 adjust_dynamic_symbol is called, and it is that
3514 function which decides whether anything needs to go
3515 into these sections. */
3516 if (strip_section)
3517 s->flags |= SEC_EXCLUDE;
3518 continue;
3519 }
3520
3521 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3522 continue;
3523
3524 /* Allocate memory for the section contents. We use bfd_zalloc
3525 here in case unused entries are not reclaimed before the
3526 section's contents are written out. This should not happen,
3527 but this way if it does, we get a R_386_NONE reloc instead
3528 of garbage. */
3529 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3530 if (s->contents == NULL)
3531 return FALSE;
3532 }
3533
3534 if (htab->plt_eh_frame != NULL
3535 && htab->plt_eh_frame->contents != NULL)
3536 {
3537 memcpy (htab->plt_eh_frame->contents,
3538 get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt,
3539 htab->plt_eh_frame->size);
3540 bfd_put_32 (dynobj, htab->elf.splt->size,
3541 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3542 }
3543
3544 if (htab->plt_got_eh_frame != NULL
3545 && htab->plt_got_eh_frame->contents != NULL)
3546 {
3547 memcpy (htab->plt_got_eh_frame->contents,
3548 get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_got,
3549 htab->plt_got_eh_frame->size);
3550 bfd_put_32 (dynobj, htab->plt_got->size,
3551 (htab->plt_got_eh_frame->contents
3552 + PLT_FDE_LEN_OFFSET));
3553 }
3554
3555 if (htab->elf.dynamic_sections_created)
3556 {
3557 /* Add some entries to the .dynamic section. We fill in the
3558 values later, in elf_i386_finish_dynamic_sections, but we
3559 must add the entries now so that we get the correct size for
3560 the .dynamic section. The DT_DEBUG entry is filled in by the
3561 dynamic linker and used by the debugger. */
3562#define add_dynamic_entry(TAG, VAL) \
3563 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3564
3565 if (bfd_link_executable (info))
3566 {
3567 if (!add_dynamic_entry (DT_DEBUG, 0))
3568 return FALSE;
3569 }
3570
3571 if (htab->elf.splt->size != 0)
3572 {
3573 /* DT_PLTGOT is used by prelink even if there is no PLT
3574 relocation. */
3575 if (!add_dynamic_entry (DT_PLTGOT, 0))
3576 return FALSE;
3577 }
3578
3579 if (htab->elf.srelplt->size != 0)
3580 {
3581 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3582 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3583 || !add_dynamic_entry (DT_JMPREL, 0))
3584 return FALSE;
3585 }
3586
3587 if (relocs)
3588 {
3589 if (!add_dynamic_entry (DT_REL, 0)
3590 || !add_dynamic_entry (DT_RELSZ, 0)
3591 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3592 return FALSE;
3593
3594 /* If any dynamic relocs apply to a read-only section,
3595 then we need a DT_TEXTREL entry. */
3596 if ((info->flags & DF_TEXTREL) == 0)
3597 elf_link_hash_traverse (&htab->elf,
3598 elf_i386_readonly_dynrelocs, info);
3599
3600 if ((info->flags & DF_TEXTREL) != 0)
3601 {
3602 if (htab->readonly_dynrelocs_against_ifunc)
3603 {
3604 info->callbacks->einfo
3605 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3606 bfd_set_error (bfd_error_bad_value);
3607 return FALSE;
3608 }
3609
3610 if (!add_dynamic_entry (DT_TEXTREL, 0))
3611 return FALSE;
3612 }
3613 }
3614 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3615 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3616 return FALSE;
3617 }
3618#undef add_dynamic_entry
3619
3620 return TRUE;
3621}
3622
3623static bfd_boolean
3624elf_i386_always_size_sections (bfd *output_bfd,
3625 struct bfd_link_info *info)
3626{
3627 asection *tls_sec = elf_hash_table (info)->tls_sec;
3628
3629 if (tls_sec)
3630 {
3631 struct elf_link_hash_entry *tlsbase;
3632
3633 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3634 "_TLS_MODULE_BASE_",
3635 FALSE, FALSE, FALSE);
3636
3637 if (tlsbase && tlsbase->type == STT_TLS)
3638 {
3639 struct elf_i386_link_hash_table *htab;
3640 struct bfd_link_hash_entry *bh = NULL;
3641 const struct elf_backend_data *bed
3642 = get_elf_backend_data (output_bfd);
3643
3644 htab = elf_i386_hash_table (info);
3645 if (htab == NULL)
3646 return FALSE;
3647
3648 if (!(_bfd_generic_link_add_one_symbol
3649 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3650 tls_sec, 0, NULL, FALSE,
3651 bed->collect, &bh)))
3652 return FALSE;
3653
3654 htab->tls_module_base = bh;
3655
3656 tlsbase = (struct elf_link_hash_entry *)bh;
3657 tlsbase->def_regular = 1;
3658 tlsbase->other = STV_HIDDEN;
3659 tlsbase->root.linker_def = 1;
3660 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3661 }
3662 }
3663
3664 return TRUE;
3665}
3666
3667/* Set the correct type for an x86 ELF section. We do this by the
3668 section name, which is a hack, but ought to work. */
3669
3670static bfd_boolean
3671elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3672 Elf_Internal_Shdr *hdr,
3673 asection *sec)
3674{
3675 const char *name;
3676
3677 name = bfd_get_section_name (abfd, sec);
3678
3679 /* This is an ugly, but unfortunately necessary hack that is
3680 needed when producing EFI binaries on x86. It tells
3681 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3682 containing ELF relocation info. We need this hack in order to
3683 be able to generate ELF binaries that can be translated into
3684 EFI applications (which are essentially COFF objects). Those
3685 files contain a COFF ".reloc" section inside an ELFNN object,
3686 which would normally cause BFD to segfault because it would
3687 attempt to interpret this section as containing relocation
3688 entries for section "oc". With this hack enabled, ".reloc"
3689 will be treated as a normal data section, which will avoid the
3690 segfault. However, you won't be able to create an ELFNN binary
3691 with a section named "oc" that needs relocations, but that's
3692 the kind of ugly side-effects you get when detecting section
3693 types based on their names... In practice, this limitation is
3694 unlikely to bite. */
3695 if (strcmp (name, ".reloc") == 0)
3696 hdr->sh_type = SHT_PROGBITS;
3697
3698 return TRUE;
3699}
3700
3701/* _TLS_MODULE_BASE_ needs to be treated especially when linking
3702 executables. Rather than setting it to the beginning of the TLS
3703 section, we have to set it to the end. This function may be called
3704 multiple times, it is idempotent. */
3705
3706static void
3707elf_i386_set_tls_module_base (struct bfd_link_info *info)
3708{
3709 struct elf_i386_link_hash_table *htab;
3710 struct bfd_link_hash_entry *base;
3711
3712 if (!bfd_link_executable (info))
3713 return;
3714
3715 htab = elf_i386_hash_table (info);
3716 if (htab == NULL)
3717 return;
3718
3719 base = htab->tls_module_base;
3720 if (base == NULL)
3721 return;
3722
3723 base->u.def.value = htab->elf.tls_size;
3724}
3725
3726/* Return the base VMA address which should be subtracted from real addresses
3727 when resolving @dtpoff relocation.
3728 This is PT_TLS segment p_vaddr. */
3729
3730static bfd_vma
3731elf_i386_dtpoff_base (struct bfd_link_info *info)
3732{
3733 /* If tls_sec is NULL, we should have signalled an error already. */
3734 if (elf_hash_table (info)->tls_sec == NULL)
3735 return 0;
3736 return elf_hash_table (info)->tls_sec->vma;
3737}
3738
3739/* Return the relocation value for @tpoff relocation
3740 if STT_TLS virtual address is ADDRESS. */
3741
3742static bfd_vma
3743elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3744{
3745 struct elf_link_hash_table *htab = elf_hash_table (info);
3746 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3747 bfd_vma static_tls_size;
3748
3749 /* If tls_sec is NULL, we should have signalled an error already. */
3750 if (htab->tls_sec == NULL)
3751 return 0;
3752
3753 /* Consider special static TLS alignment requirements. */
3754 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3755 return static_tls_size + htab->tls_sec->vma - address;
3756}
3757
3758/* Relocate an i386 ELF section. */
3759
3760static bfd_boolean
3761elf_i386_relocate_section (bfd *output_bfd,
3762 struct bfd_link_info *info,
3763 bfd *input_bfd,
3764 asection *input_section,
3765 bfd_byte *contents,
3766 Elf_Internal_Rela *relocs,
3767 Elf_Internal_Sym *local_syms,
3768 asection **local_sections)
3769{
3770 struct elf_i386_link_hash_table *htab;
3771 Elf_Internal_Shdr *symtab_hdr;
3772 struct elf_link_hash_entry **sym_hashes;
3773 bfd_vma *local_got_offsets;
3774 bfd_vma *local_tlsdesc_gotents;
3775 Elf_Internal_Rela *rel;
3776 Elf_Internal_Rela *wrel;
3777 Elf_Internal_Rela *relend;
3778 bfd_boolean is_vxworks_tls;
3779 unsigned plt_entry_size;
3780
3781 BFD_ASSERT (is_i386_elf (input_bfd));
3782
3783 /* Skip if check_relocs failed. */
3784 if (input_section->check_relocs_failed)
3785 return FALSE;
3786
3787 htab = elf_i386_hash_table (info);
3788 if (htab == NULL)
3789 return FALSE;
3790 symtab_hdr = &elf_symtab_hdr (input_bfd);
3791 sym_hashes = elf_sym_hashes (input_bfd);
3792 local_got_offsets = elf_local_got_offsets (input_bfd);
3793 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3794 /* We have to handle relocations in vxworks .tls_vars sections
3795 specially, because the dynamic loader is 'weird'. */
3796 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3797 && bfd_link_pic (info)
3798 && !strcmp (input_section->output_section->name,
3799 ".tls_vars"));
3800
3801 elf_i386_set_tls_module_base (info);
3802
3803 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3804
3805 rel = wrel = relocs;
3806 relend = relocs + input_section->reloc_count;
3807 for (; rel < relend; wrel++, rel++)
3808 {
3809 unsigned int r_type;
3810 reloc_howto_type *howto;
3811 unsigned long r_symndx;
3812 struct elf_link_hash_entry *h;
3813 struct elf_i386_link_hash_entry *eh;
3814 Elf_Internal_Sym *sym;
3815 asection *sec;
3816 bfd_vma off, offplt, plt_offset;
3817 bfd_vma relocation;
3818 bfd_boolean unresolved_reloc;
3819 bfd_reloc_status_type r;
3820 unsigned int indx;
3821 int tls_type;
3822 bfd_vma st_size;
3823 asection *resolved_plt;
3824 bfd_boolean resolved_to_zero;
3825 bfd_boolean relative_reloc;
3826
3827 r_type = ELF32_R_TYPE (rel->r_info);
3828 if (r_type == R_386_GNU_VTINHERIT
3829 || r_type == R_386_GNU_VTENTRY)
3830 {
3831 if (wrel != rel)
3832 *wrel = *rel;
3833 continue;
3834 }
3835
3836 if ((indx = r_type) >= R_386_standard
3837 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3838 >= R_386_ext - R_386_standard)
3839 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3840 >= R_386_ext2 - R_386_ext))
3841 {
3842 _bfd_error_handler
3843 /* xgettext:c-format */
3844 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3845 input_bfd, r_type, input_section);
3846 bfd_set_error (bfd_error_bad_value);
3847 return FALSE;
3848 }
3849 howto = elf_howto_table + indx;
3850
3851 r_symndx = ELF32_R_SYM (rel->r_info);
3852 h = NULL;
3853 sym = NULL;
3854 sec = NULL;
3855 unresolved_reloc = FALSE;
3856 if (r_symndx < symtab_hdr->sh_info)
3857 {
3858 sym = local_syms + r_symndx;
3859 sec = local_sections[r_symndx];
3860 relocation = (sec->output_section->vma
3861 + sec->output_offset
3862 + sym->st_value);
3863 st_size = sym->st_size;
3864
3865 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3866 && ((sec->flags & SEC_MERGE) != 0
3867 || (bfd_link_relocatable (info)
3868 && sec->output_offset != 0)))
3869 {
3870 bfd_vma addend;
3871 bfd_byte *where = contents + rel->r_offset;
3872
3873 switch (howto->size)
3874 {
3875 case 0:
3876 addend = bfd_get_8 (input_bfd, where);
3877 if (howto->pc_relative)
3878 {
3879 addend = (addend ^ 0x80) - 0x80;
3880 addend += 1;
3881 }
3882 break;
3883 case 1:
3884 addend = bfd_get_16 (input_bfd, where);
3885 if (howto->pc_relative)
3886 {
3887 addend = (addend ^ 0x8000) - 0x8000;
3888 addend += 2;
3889 }
3890 break;
3891 case 2:
3892 addend = bfd_get_32 (input_bfd, where);
3893 if (howto->pc_relative)
3894 {
3895 addend = (addend ^ 0x80000000) - 0x80000000;
3896 addend += 4;
3897 }
3898 break;
3899 default:
3900 abort ();
3901 }
3902
3903 if (bfd_link_relocatable (info))
3904 addend += sec->output_offset;
3905 else
3906 {
3907 asection *msec = sec;
3908 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3909 addend);
3910 addend -= relocation;
3911 addend += msec->output_section->vma + msec->output_offset;
3912 }
3913
3914 switch (howto->size)
3915 {
3916 case 0:
3917 /* FIXME: overflow checks. */
3918 if (howto->pc_relative)
3919 addend -= 1;
3920 bfd_put_8 (input_bfd, addend, where);
3921 break;
3922 case 1:
3923 if (howto->pc_relative)
3924 addend -= 2;
3925 bfd_put_16 (input_bfd, addend, where);
3926 break;
3927 case 2:
3928 if (howto->pc_relative)
3929 addend -= 4;
3930 bfd_put_32 (input_bfd, addend, where);
3931 break;
3932 }
3933 }
3934 else if (!bfd_link_relocatable (info)
3935 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3936 {
3937 /* Relocate against local STT_GNU_IFUNC symbol. */
3938 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3939 FALSE);
3940 if (h == NULL)
3941 abort ();
3942
3943 /* Set STT_GNU_IFUNC symbol value. */
3944 h->root.u.def.value = sym->st_value;
3945 h->root.u.def.section = sec;
3946 }
3947 }
3948 else
3949 {
3950 bfd_boolean warned ATTRIBUTE_UNUSED;
3951 bfd_boolean ignored ATTRIBUTE_UNUSED;
3952
3953 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3954 r_symndx, symtab_hdr, sym_hashes,
3955 h, sec, relocation,
3956 unresolved_reloc, warned, ignored);
3957 st_size = h->size;
3958 }
3959
3960 if (sec != NULL && discarded_section (sec))
3961 {
3962 _bfd_clear_contents (howto, input_bfd, input_section,
3963 contents + rel->r_offset);
3964 wrel->r_offset = rel->r_offset;
3965 wrel->r_info = 0;
3966 wrel->r_addend = 0;
3967
3968 /* For ld -r, remove relocations in debug sections against
3969 sections defined in discarded sections. Not done for
3970 eh_frame editing code expects to be present. */
3971 if (bfd_link_relocatable (info)
3972 && (input_section->flags & SEC_DEBUGGING))
3973 wrel--;
3974
3975 continue;
3976 }
3977
3978 if (bfd_link_relocatable (info))
3979 {
3980 if (wrel != rel)
3981 *wrel = *rel;
3982 continue;
3983 }
3984
3985 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3986 it here if it is defined in a non-shared object. */
3987 if (h != NULL
3988 && h->type == STT_GNU_IFUNC
3989 && h->def_regular)
3990 {
3991 asection *plt, *gotplt, *base_got;
3992 bfd_vma plt_index;
3993 const char *name;
3994
3995 if ((input_section->flags & SEC_ALLOC) == 0)
3996 {
3997 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3998 sections because such sections are not SEC_ALLOC and
3999 thus ld.so will not process them. */
4000 if ((input_section->flags & SEC_DEBUGGING) != 0)
4001 continue;
4002 abort ();
4003 }
4004
4005 /* STT_GNU_IFUNC symbol must go through PLT. */
4006 if (htab->elf.splt != NULL)
4007 {
4008 plt = htab->elf.splt;
4009 gotplt = htab->elf.sgotplt;
4010 }
4011 else
4012 {
4013 plt = htab->elf.iplt;
4014 gotplt = htab->elf.igotplt;
4015 }
4016
4017 switch (r_type)
4018 {
4019 default:
4020 break;
4021
4022 case R_386_GOT32:
4023 case R_386_GOT32X:
4024 base_got = htab->elf.sgot;
4025 off = h->got.offset;
4026
4027 if (base_got == NULL)
4028 abort ();
4029
4030 if (off == (bfd_vma) -1)
4031 {
4032 /* We can't use h->got.offset here to save state, or
4033 even just remember the offset, as finish_dynamic_symbol
4034 would use that as offset into .got. */
4035
4036 if (h->plt.offset == (bfd_vma) -1)
4037 abort ();
4038
4039 if (htab->elf.splt != NULL)
4040 {
4041 plt_index = h->plt.offset / plt_entry_size - 1;
4042 off = (plt_index + 3) * 4;
4043 base_got = htab->elf.sgotplt;
4044 }
4045 else
4046 {
4047 plt_index = h->plt.offset / plt_entry_size;
4048 off = plt_index * 4;
4049 base_got = htab->elf.igotplt;
4050 }
4051
4052 if (h->dynindx == -1
4053 || h->forced_local
4054 || info->symbolic)
4055 {
4056 /* This references the local defitionion. We must
4057 initialize this entry in the global offset table.
4058 Since the offset must always be a multiple of 8,
4059 we use the least significant bit to record
4060 whether we have initialized it already.
4061
4062 When doing a dynamic link, we create a .rela.got
4063 relocation entry to initialize the value. This
4064 is done in the finish_dynamic_symbol routine. */
4065 if ((off & 1) != 0)
4066 off &= ~1;
4067 else
4068 {
4069 bfd_put_32 (output_bfd, relocation,
4070 base_got->contents + off);
4071 h->got.offset |= 1;
4072 }
4073 }
4074
4075 relocation = off;
4076 }
4077 else
4078 relocation = (base_got->output_section->vma
4079 + base_got->output_offset + off
4080 - gotplt->output_section->vma
4081 - gotplt->output_offset);
4082
4083 if (rel->r_offset > 1
4084 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4085 && *(contents + rel->r_offset - 2) != 0x8d)
4086 {
4087 if (bfd_link_pic (info))
4088 goto disallow_got32;
4089
4090 /* Add the GOT base if there is no base register. */
4091 relocation += (gotplt->output_section->vma
4092 + gotplt->output_offset);
4093 }
4094 else if (htab->elf.splt == NULL)
4095 {
4096 /* Adjust for static executables. */
4097 relocation += gotplt->output_offset;
4098 }
4099
4100 goto do_relocation;
4101 }
4102
4103 if (h->plt.offset == (bfd_vma) -1)
4104 {
4105 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4106 if (r_type == R_386_32
4107 && (input_section->flags & SEC_CODE) == 0)
4108 goto do_ifunc_pointer;
4109 goto bad_ifunc_reloc;
4110 }
4111
4112 relocation = (plt->output_section->vma
4113 + plt->output_offset + h->plt.offset);
4114
4115 switch (r_type)
4116 {
4117 default:
4118bad_ifunc_reloc:
4119 if (h->root.root.string)
4120 name = h->root.root.string;
4121 else
4122 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4123 NULL);
4124 _bfd_error_handler
4125 /* xgettext:c-format */
4126 (_("%B: relocation %s against STT_GNU_IFUNC "
4127 "symbol `%s' isn't supported"), input_bfd,
4128 howto->name, name);
4129 bfd_set_error (bfd_error_bad_value);
4130 return FALSE;
4131
4132 case R_386_32:
4133 /* Generate dynamic relcoation only when there is a
4134 non-GOT reference in a shared object. */
4135 if ((bfd_link_pic (info) && h->non_got_ref)
4136 || h->plt.offset == (bfd_vma) -1)
4137 {
4138 Elf_Internal_Rela outrel;
4139 asection *sreloc;
4140 bfd_vma offset;
4141
4142do_ifunc_pointer:
4143 /* Need a dynamic relocation to get the real function
4144 adddress. */
4145 offset = _bfd_elf_section_offset (output_bfd,
4146 info,
4147 input_section,
4148 rel->r_offset);
4149 if (offset == (bfd_vma) -1
4150 || offset == (bfd_vma) -2)
4151 abort ();
4152
4153 outrel.r_offset = (input_section->output_section->vma
4154 + input_section->output_offset
4155 + offset);
4156
4157 if (h->dynindx == -1
4158 || h->forced_local
4159 || bfd_link_executable (info))
4160 {
4161 /* This symbol is resolved locally. */
4162 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4163 bfd_put_32 (output_bfd,
4164 (h->root.u.def.value
4165 + h->root.u.def.section->output_section->vma
4166 + h->root.u.def.section->output_offset),
4167 contents + offset);
4168 }
4169 else
4170 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4171
4172 /* Dynamic relocations are stored in
4173 1. .rel.ifunc section in PIC object.
4174 2. .rel.got section in dynamic executable.
4175 3. .rel.iplt section in static executable. */
4176 if (bfd_link_pic (info))
4177 sreloc = htab->elf.irelifunc;
4178 else if (htab->elf.splt != NULL)
4179 sreloc = htab->elf.srelgot;
4180 else
4181 sreloc = htab->elf.irelplt;
4182 elf_append_rel (output_bfd, sreloc, &outrel);
4183
4184 /* If this reloc is against an external symbol, we
4185 do not want to fiddle with the addend. Otherwise,
4186 we need to include the symbol value so that it
4187 becomes an addend for the dynamic reloc. For an
4188 internal symbol, we have updated addend. */
4189 continue;
4190 }
4191 /* FALLTHROUGH */
4192 case R_386_PC32:
4193 case R_386_PLT32:
4194 goto do_relocation;
4195
4196 case R_386_GOTOFF:
4197 relocation -= (gotplt->output_section->vma
4198 + gotplt->output_offset);
4199 goto do_relocation;
4200 }
4201 }
4202
4203 eh = (struct elf_i386_link_hash_entry *) h;
4204 resolved_to_zero = (eh != NULL
4205 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4206 eh->has_got_reloc,
4207 eh));
4208
4209 switch (r_type)
4210 {
4211 case R_386_GOT32X:
4212 /* Avoid optimizing _DYNAMIC since ld.so may use its
4213 link-time address. */
4214 if (h == htab->elf.hdynamic)
4215 goto r_386_got32;
4216
4217 if (bfd_link_pic (info))
4218 {
4219 /* It is OK to convert mov to lea and convert indirect
4220 branch to direct branch. It is OK to convert adc,
4221 add, and, cmp, or, sbb, sub, test, xor only when PIC
4222 is false. */
4223 unsigned int opcode, addend;
4224 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4225 if (addend != 0)
4226 goto r_386_got32;
4227 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4228 if (opcode != 0x8b && opcode != 0xff)
4229 goto r_386_got32;
4230 }
4231
4232 /* Resolve "mov GOT[(%reg)], %reg",
4233 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4234 and "binop foo@GOT[(%reg)], %reg". */
4235 if (h == NULL
4236 || (h->plt.offset == (bfd_vma) -1
4237 && h->got.offset == (bfd_vma) -1)
4238 || htab->elf.sgotplt == NULL)
4239 abort ();
4240
4241 offplt = (htab->elf.sgotplt->output_section->vma
4242 + htab->elf.sgotplt->output_offset);
4243
4244 /* It is relative to .got.plt section. */
4245 if (h->got.offset != (bfd_vma) -1)
4246 /* Use GOT entry. Mask off the least significant bit in
4247 GOT offset which may be set by R_386_GOT32 processing
4248 below. */
4249 relocation = (htab->elf.sgot->output_section->vma
4250 + htab->elf.sgot->output_offset
4251 + (h->got.offset & ~1) - offplt);
4252 else
4253 /* Use GOTPLT entry. */
4254 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4255
4256 if (!bfd_link_pic (info))
4257 {
4258 /* If not PIC, add the .got.plt section address for
4259 baseless addressing. */
4260 unsigned int modrm;
4261 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4262 if ((modrm & 0xc7) == 0x5)
4263 relocation += offplt;
4264 }
4265
4266 unresolved_reloc = FALSE;
4267 break;
4268
4269 case R_386_GOT32:
4270r_386_got32:
4271 /* Relocation is to the entry for this symbol in the global
4272 offset table. */
4273 if (htab->elf.sgot == NULL)
4274 abort ();
4275
4276 relative_reloc = FALSE;
4277 if (h != NULL)
4278 {
4279 bfd_boolean dyn;
4280
4281 off = h->got.offset;
4282 dyn = htab->elf.dynamic_sections_created;
4283 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4284 bfd_link_pic (info),
4285 h)
4286 || (bfd_link_pic (info)
4287 && SYMBOL_REFERENCES_LOCAL (info, h))
4288 || (ELF_ST_VISIBILITY (h->other)
4289 && h->root.type == bfd_link_hash_undefweak))
4290 {
4291 /* This is actually a static link, or it is a
4292 -Bsymbolic link and the symbol is defined
4293 locally, or the symbol was forced to be local
4294 because of a version file. We must initialize
4295 this entry in the global offset table. Since the
4296 offset must always be a multiple of 4, we use the
4297 least significant bit to record whether we have
4298 initialized it already.
4299
4300 When doing a dynamic link, we create a .rel.got
4301 relocation entry to initialize the value. This
4302 is done in the finish_dynamic_symbol routine. */
4303 if ((off & 1) != 0)
4304 off &= ~1;
4305 else
4306 {
4307 bfd_put_32 (output_bfd, relocation,
4308 htab->elf.sgot->contents + off);
4309 h->got.offset |= 1;
4310
4311 if (h->dynindx == -1
4312 && !h->forced_local
4313 && h->root.type != bfd_link_hash_undefweak
4314 && bfd_link_pic (info))
4315 {
4316 /* PR ld/21402: If this symbol isn't dynamic
4317 in PIC, generate R_386_RELATIVE here. */
4318 eh->no_finish_dynamic_symbol = 1;
4319 relative_reloc = TRUE;
4320 }
4321 }
4322 }
4323 else
4324 unresolved_reloc = FALSE;
4325 }
4326 else
4327 {
4328 if (local_got_offsets == NULL)
4329 abort ();
4330
4331 off = local_got_offsets[r_symndx];
4332
4333 /* The offset must always be a multiple of 4. We use
4334 the least significant bit to record whether we have
4335 already generated the necessary reloc. */
4336 if ((off & 1) != 0)
4337 off &= ~1;
4338 else
4339 {
4340 bfd_put_32 (output_bfd, relocation,
4341 htab->elf.sgot->contents + off);
4342 local_got_offsets[r_symndx] |= 1;
4343
4344 if (bfd_link_pic (info))
4345 relative_reloc = TRUE;
4346 }
4347 }
4348
4349 if (relative_reloc)
4350 {
4351 asection *s;
4352 Elf_Internal_Rela outrel;
4353
4354 s = htab->elf.srelgot;
4355 if (s == NULL)
4356 abort ();
4357
4358 outrel.r_offset = (htab->elf.sgot->output_section->vma
4359 + htab->elf.sgot->output_offset
4360 + off);
4361 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4362 elf_append_rel (output_bfd, s, &outrel);
4363 }
4364
4365 if (off >= (bfd_vma) -2)
4366 abort ();
4367
4368 relocation = (htab->elf.sgot->output_section->vma
4369 + htab->elf.sgot->output_offset + off);
4370 if (rel->r_offset > 1
4371 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4372 && *(contents + rel->r_offset - 2) != 0x8d)
4373 {
4374 if (bfd_link_pic (info))
4375 {
4376 /* For PIC, disallow R_386_GOT32 without a base
4377 register, except for "lea foo@GOT, %reg", since
4378 we don't know what the GOT base is. */
4379 const char *name;
4380
4381disallow_got32:
4382 if (h == NULL || h->root.root.string == NULL)
4383 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4384 NULL);
4385 else
4386 name = h->root.root.string;
4387
4388 _bfd_error_handler
4389 /* xgettext:c-format */
4390 (_("%B: direct GOT relocation %s against `%s'"
4391 " without base register can not be used"
4392 " when making a shared object"),
4393 input_bfd, howto->name, name);
4394 bfd_set_error (bfd_error_bad_value);
4395 return FALSE;
4396 }
4397 }
4398 else
4399 {
4400 /* Subtract the .got.plt section address only with a base
4401 register. */
4402 relocation -= (htab->elf.sgotplt->output_section->vma
4403 + htab->elf.sgotplt->output_offset);
4404 }
4405
4406 break;
4407
4408 case R_386_GOTOFF:
4409 /* Relocation is relative to the start of the global offset
4410 table. */
4411
4412 /* Check to make sure it isn't a protected function or data
4413 symbol for shared library since it may not be local when
4414 used as function address or with copy relocation. We also
4415 need to make sure that a symbol is referenced locally. */
4416 if (!bfd_link_executable (info) && h)
4417 {
4418 if (!h->def_regular)
4419 {
4420 const char *v;
4421
4422 switch (ELF_ST_VISIBILITY (h->other))
4423 {
4424 case STV_HIDDEN:
4425 v = _("hidden symbol");
4426 break;
4427 case STV_INTERNAL:
4428 v = _("internal symbol");
4429 break;
4430 case STV_PROTECTED:
4431 v = _("protected symbol");
4432 break;
4433 default:
4434 v = _("symbol");
4435 break;
4436 }
4437
4438 _bfd_error_handler
4439 /* xgettext:c-format */
4440 (_("%B: relocation R_386_GOTOFF against undefined %s"
4441 " `%s' can not be used when making a shared object"),
4442 input_bfd, v, h->root.root.string);
4443 bfd_set_error (bfd_error_bad_value);
4444 return FALSE;
4445 }
4446 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4447 && (h->type == STT_FUNC
4448 || h->type == STT_OBJECT)
4449 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4450 {
4451 _bfd_error_handler
4452 /* xgettext:c-format */
4453 (_("%B: relocation R_386_GOTOFF against protected %s"
4454 " `%s' can not be used when making a shared object"),
4455 input_bfd,
4456 h->type == STT_FUNC ? "function" : "data",
4457 h->root.root.string);
4458 bfd_set_error (bfd_error_bad_value);
4459 return FALSE;
4460 }
4461 }
4462
4463 /* Note that sgot is not involved in this
4464 calculation. We always want the start of .got.plt. If we
4465 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4466 permitted by the ABI, we might have to change this
4467 calculation. */
4468 relocation -= htab->elf.sgotplt->output_section->vma
4469 + htab->elf.sgotplt->output_offset;
4470 break;
4471
4472 case R_386_GOTPC:
4473 /* Use global offset table as symbol value. */
4474 relocation = htab->elf.sgotplt->output_section->vma
4475 + htab->elf.sgotplt->output_offset;
4476 unresolved_reloc = FALSE;
4477 break;
4478
4479 case R_386_PLT32:
4480 /* Relocation is to the entry for this symbol in the
4481 procedure linkage table. */
4482
4483 /* Resolve a PLT32 reloc against a local symbol directly,
4484 without using the procedure linkage table. */
4485 if (h == NULL)
4486 break;
4487
4488 if ((h->plt.offset == (bfd_vma) -1
4489 && eh->plt_got.offset == (bfd_vma) -1)
4490 || htab->elf.splt == NULL)
4491 {
4492 /* We didn't make a PLT entry for this symbol. This
4493 happens when statically linking PIC code, or when
4494 using -Bsymbolic. */
4495 break;
4496 }
4497
4498 if (h->plt.offset != (bfd_vma) -1)
4499 {
4500 resolved_plt = htab->elf.splt;
4501 plt_offset = h->plt.offset;
4502 }
4503 else
4504 {
4505 resolved_plt = htab->plt_got;
4506 plt_offset = eh->plt_got.offset;
4507 }
4508
4509 relocation = (resolved_plt->output_section->vma
4510 + resolved_plt->output_offset
4511 + plt_offset);
4512 unresolved_reloc = FALSE;
4513 break;
4514
4515 case R_386_SIZE32:
4516 /* Set to symbol size. */
4517 relocation = st_size;
4518 /* Fall through. */
4519
4520 case R_386_32:
4521 case R_386_PC32:
4522 if ((input_section->flags & SEC_ALLOC) == 0
4523 || is_vxworks_tls)
4524 break;
4525
4526 /* Copy dynamic function pointer relocations. Don't generate
4527 dynamic relocations against resolved undefined weak symbols
4528 in PIE, except for R_386_PC32. */
4529 if ((bfd_link_pic (info)
4530 && (h == NULL
4531 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4532 && (!resolved_to_zero
4533 || r_type == R_386_PC32))
4534 || h->root.type != bfd_link_hash_undefweak))
4535 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4536 || !SYMBOL_CALLS_LOCAL (info, h)))
4537 || (ELIMINATE_COPY_RELOCS
4538 && !bfd_link_pic (info)
4539 && h != NULL
4540 && h->dynindx != -1
4541 && (!h->non_got_ref
4542 || eh->func_pointer_refcount > 0
4543 || (h->root.type == bfd_link_hash_undefweak
4544 && !resolved_to_zero))
4545 && ((h->def_dynamic && !h->def_regular)
4546 /* Undefined weak symbol is bound locally when
4547 PIC is false. */
4548 || h->root.type == bfd_link_hash_undefweak)))
4549 {
4550 Elf_Internal_Rela outrel;
4551 bfd_boolean skip, relocate;
4552 asection *sreloc;
4553
4554 /* When generating a shared object, these relocations
4555 are copied into the output file to be resolved at run
4556 time. */
4557
4558 skip = FALSE;
4559 relocate = FALSE;
4560
4561 outrel.r_offset =
4562 _bfd_elf_section_offset (output_bfd, info, input_section,
4563 rel->r_offset);
4564 if (outrel.r_offset == (bfd_vma) -1)
4565 skip = TRUE;
4566 else if (outrel.r_offset == (bfd_vma) -2)
4567 skip = TRUE, relocate = TRUE;
4568 outrel.r_offset += (input_section->output_section->vma
4569 + input_section->output_offset);
4570
4571 if (skip)
4572 memset (&outrel, 0, sizeof outrel);
4573 else if (h != NULL
4574 && h->dynindx != -1
4575 && (r_type == R_386_PC32
4576 || !(bfd_link_executable (info)
4577 || SYMBOLIC_BIND (info, h))
4578 || !h->def_regular))
4579 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4580 else
4581 {
4582 /* This symbol is local, or marked to become local. */
4583 relocate = TRUE;
4584 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4585 }
4586
4587 sreloc = elf_section_data (input_section)->sreloc;
4588
4589 if (sreloc == NULL || sreloc->contents == NULL)
4590 {
4591 r = bfd_reloc_notsupported;
4592 goto check_relocation_error;
4593 }
4594
4595 elf_append_rel (output_bfd, sreloc, &outrel);
4596
4597 /* If this reloc is against an external symbol, we do
4598 not want to fiddle with the addend. Otherwise, we
4599 need to include the symbol value so that it becomes
4600 an addend for the dynamic reloc. */
4601 if (! relocate)
4602 continue;
4603 }
4604 break;
4605
4606 case R_386_TLS_IE:
4607 if (!bfd_link_executable (info))
4608 {
4609 Elf_Internal_Rela outrel;
4610 asection *sreloc;
4611
4612 outrel.r_offset = rel->r_offset
4613 + input_section->output_section->vma
4614 + input_section->output_offset;
4615 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4616 sreloc = elf_section_data (input_section)->sreloc;
4617 if (sreloc == NULL)
4618 abort ();
4619 elf_append_rel (output_bfd, sreloc, &outrel);
4620 }
4621 /* Fall through */
4622
4623 case R_386_TLS_GD:
4624 case R_386_TLS_GOTDESC:
4625 case R_386_TLS_DESC_CALL:
4626 case R_386_TLS_IE_32:
4627 case R_386_TLS_GOTIE:
4628 tls_type = GOT_UNKNOWN;
4629 if (h == NULL && local_got_offsets)
4630 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4631 else if (h != NULL)
4632 tls_type = elf_i386_hash_entry(h)->tls_type;
4633 if (tls_type == GOT_TLS_IE)
4634 tls_type = GOT_TLS_IE_NEG;
4635
4636 if (! elf_i386_tls_transition (info, input_bfd,
4637 input_section, contents,
4638 symtab_hdr, sym_hashes,
4639 &r_type, tls_type, rel,
4640 relend, h, r_symndx, TRUE))
4641 return FALSE;
4642
4643 if (r_type == R_386_TLS_LE_32)
4644 {
4645 BFD_ASSERT (! unresolved_reloc);
4646 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4647 {
4648 unsigned int type;
4649 bfd_vma roff;
4650
4651 /* GD->LE transition. */
4652 type = *(contents + rel->r_offset - 2);
4653 if (type == 0x04)
4654 {
4655 /* Change
4656 leal foo@tlsgd(,%ebx,1), %eax
4657 call ___tls_get_addr@PLT
4658 into:
4659 movl %gs:0, %eax
4660 subl $foo@tpoff, %eax
4661 (6 byte form of subl). */
4662 roff = rel->r_offset + 5;
4663 }
4664 else
4665 {
4666 /* Change
4667 leal foo@tlsgd(%ebx), %eax
4668 call ___tls_get_addr@PLT
4669 nop
4670 or
4671 leal foo@tlsgd(%reg), %eax
4672 call *___tls_get_addr@GOT(%reg)
4673 which may be converted to
4674 addr32 call ___tls_get_addr
4675 into:
4676 movl %gs:0, %eax; subl $foo@tpoff, %eax
4677 (6 byte form of subl). */
4678 roff = rel->r_offset + 6;
4679 }
4680 memcpy (contents + roff - 8,
4681 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4682 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4683 contents + roff);
4684 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4685 rel++;
4686 wrel++;
4687 continue;
4688 }
4689 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4690 {
4691 /* GDesc -> LE transition.
4692 It's originally something like:
4693 leal x@tlsdesc(%ebx), %eax
4694
4695 leal x@ntpoff, %eax
4696
4697 Registers other than %eax may be set up here. */
4698
4699 unsigned int val;
4700 bfd_vma roff;
4701
4702 roff = rel->r_offset;
4703 val = bfd_get_8 (input_bfd, contents + roff - 1);
4704
4705 /* Now modify the instruction as appropriate. */
4706 /* aoliva FIXME: remove the above and xor the byte
4707 below with 0x86. */
4708 bfd_put_8 (output_bfd, val ^ 0x86,
4709 contents + roff - 1);
4710 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4711 contents + roff);
4712 continue;
4713 }
4714 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4715 {
4716 /* GDesc -> LE transition.
4717 It's originally:
4718 call *(%eax)
4719 Turn it into:
4720 xchg %ax,%ax */
4721
4722 bfd_vma roff;
4723
4724 roff = rel->r_offset;
4725 bfd_put_8 (output_bfd, 0x66, contents + roff);
4726 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4727 continue;
4728 }
4729 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4730 {
4731 unsigned int val;
4732
4733 /* IE->LE transition:
4734 Originally it can be one of:
4735 movl foo, %eax
4736 movl foo, %reg
4737 addl foo, %reg
4738 We change it into:
4739 movl $foo, %eax
4740 movl $foo, %reg
4741 addl $foo, %reg. */
4742 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4743 if (val == 0xa1)
4744 {
4745 /* movl foo, %eax. */
4746 bfd_put_8 (output_bfd, 0xb8,
4747 contents + rel->r_offset - 1);
4748 }
4749 else
4750 {
4751 unsigned int type;
4752
4753 type = bfd_get_8 (input_bfd,
4754 contents + rel->r_offset - 2);
4755 switch (type)
4756 {
4757 case 0x8b:
4758 /* movl */
4759 bfd_put_8 (output_bfd, 0xc7,
4760 contents + rel->r_offset - 2);
4761 bfd_put_8 (output_bfd,
4762 0xc0 | ((val >> 3) & 7),
4763 contents + rel->r_offset - 1);
4764 break;
4765 case 0x03:
4766 /* addl */
4767 bfd_put_8 (output_bfd, 0x81,
4768 contents + rel->r_offset - 2);
4769 bfd_put_8 (output_bfd,
4770 0xc0 | ((val >> 3) & 7),
4771 contents + rel->r_offset - 1);
4772 break;
4773 default:
4774 BFD_FAIL ();
4775 break;
4776 }
4777 }
4778 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4779 contents + rel->r_offset);
4780 continue;
4781 }
4782 else
4783 {
4784 unsigned int val, type;
4785
4786 /* {IE_32,GOTIE}->LE transition:
4787 Originally it can be one of:
4788 subl foo(%reg1), %reg2
4789 movl foo(%reg1), %reg2
4790 addl foo(%reg1), %reg2
4791 We change it into:
4792 subl $foo, %reg2
4793 movl $foo, %reg2 (6 byte form)
4794 addl $foo, %reg2. */
4795 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4796 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4797 if (type == 0x8b)
4798 {
4799 /* movl */
4800 bfd_put_8 (output_bfd, 0xc7,
4801 contents + rel->r_offset - 2);
4802 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4803 contents + rel->r_offset - 1);
4804 }
4805 else if (type == 0x2b)
4806 {
4807 /* subl */
4808 bfd_put_8 (output_bfd, 0x81,
4809 contents + rel->r_offset - 2);
4810 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4811 contents + rel->r_offset - 1);
4812 }
4813 else if (type == 0x03)
4814 {
4815 /* addl */
4816 bfd_put_8 (output_bfd, 0x81,
4817 contents + rel->r_offset - 2);
4818 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4819 contents + rel->r_offset - 1);
4820 }
4821 else
4822 BFD_FAIL ();
4823 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4824 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4825 contents + rel->r_offset);
4826 else
4827 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4828 contents + rel->r_offset);
4829 continue;
4830 }
4831 }
4832
4833 if (htab->elf.sgot == NULL)
4834 abort ();
4835
4836 if (h != NULL)
4837 {
4838 off = h->got.offset;
4839 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4840 }
4841 else
4842 {
4843 if (local_got_offsets == NULL)
4844 abort ();
4845
4846 off = local_got_offsets[r_symndx];
4847 offplt = local_tlsdesc_gotents[r_symndx];
4848 }
4849
4850 if ((off & 1) != 0)
4851 off &= ~1;
4852 else
4853 {
4854 Elf_Internal_Rela outrel;
4855 int dr_type;
4856 asection *sreloc;
4857
4858 if (htab->elf.srelgot == NULL)
4859 abort ();
4860
4861 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4862
4863 if (GOT_TLS_GDESC_P (tls_type))
4864 {
4865 bfd_byte *loc;
4866 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4867 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4868 <= htab->elf.sgotplt->size);
4869 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4870 + htab->elf.sgotplt->output_offset
4871 + offplt
4872 + htab->sgotplt_jump_table_size);
4873 sreloc = htab->elf.srelplt;
4874 loc = sreloc->contents;
4875 loc += (htab->next_tls_desc_index++
4876 * sizeof (Elf32_External_Rel));
4877 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4878 <= sreloc->contents + sreloc->size);
4879 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4880 if (indx == 0)
4881 {
4882 BFD_ASSERT (! unresolved_reloc);
4883 bfd_put_32 (output_bfd,
4884 relocation - elf_i386_dtpoff_base (info),
4885 htab->elf.sgotplt->contents + offplt
4886 + htab->sgotplt_jump_table_size + 4);
4887 }
4888 else
4889 {
4890 bfd_put_32 (output_bfd, 0,
4891 htab->elf.sgotplt->contents + offplt
4892 + htab->sgotplt_jump_table_size + 4);
4893 }
4894 }
4895
4896 sreloc = htab->elf.srelgot;
4897
4898 outrel.r_offset = (htab->elf.sgot->output_section->vma
4899 + htab->elf.sgot->output_offset + off);
4900
4901 if (GOT_TLS_GD_P (tls_type))
4902 dr_type = R_386_TLS_DTPMOD32;
4903 else if (GOT_TLS_GDESC_P (tls_type))
4904 goto dr_done;
4905 else if (tls_type == GOT_TLS_IE_POS)
4906 dr_type = R_386_TLS_TPOFF;
4907 else
4908 dr_type = R_386_TLS_TPOFF32;
4909
4910 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4911 bfd_put_32 (output_bfd,
4912 relocation - elf_i386_dtpoff_base (info),
4913 htab->elf.sgot->contents + off);
4914 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4915 bfd_put_32 (output_bfd,
4916 elf_i386_dtpoff_base (info) - relocation,
4917 htab->elf.sgot->contents + off);
4918 else if (dr_type != R_386_TLS_DESC)
4919 bfd_put_32 (output_bfd, 0,
4920 htab->elf.sgot->contents + off);
4921 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4922
4923 elf_append_rel (output_bfd, sreloc, &outrel);
4924
4925 if (GOT_TLS_GD_P (tls_type))
4926 {
4927 if (indx == 0)
4928 {
4929 BFD_ASSERT (! unresolved_reloc);
4930 bfd_put_32 (output_bfd,
4931 relocation - elf_i386_dtpoff_base (info),
4932 htab->elf.sgot->contents + off + 4);
4933 }
4934 else
4935 {
4936 bfd_put_32 (output_bfd, 0,
4937 htab->elf.sgot->contents + off + 4);
4938 outrel.r_info = ELF32_R_INFO (indx,
4939 R_386_TLS_DTPOFF32);
4940 outrel.r_offset += 4;
4941 elf_append_rel (output_bfd, sreloc, &outrel);
4942 }
4943 }
4944 else if (tls_type == GOT_TLS_IE_BOTH)
4945 {
4946 bfd_put_32 (output_bfd,
4947 (indx == 0
4948 ? relocation - elf_i386_dtpoff_base (info)
4949 : 0),
4950 htab->elf.sgot->contents + off + 4);
4951 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4952 outrel.r_offset += 4;
4953 elf_append_rel (output_bfd, sreloc, &outrel);
4954 }
4955
4956 dr_done:
4957 if (h != NULL)
4958 h->got.offset |= 1;
4959 else
4960 local_got_offsets[r_symndx] |= 1;
4961 }
4962
4963 if (off >= (bfd_vma) -2
4964 && ! GOT_TLS_GDESC_P (tls_type))
4965 abort ();
4966 if (r_type == R_386_TLS_GOTDESC
4967 || r_type == R_386_TLS_DESC_CALL)
4968 {
4969 relocation = htab->sgotplt_jump_table_size + offplt;
4970 unresolved_reloc = FALSE;
4971 }
4972 else if (r_type == ELF32_R_TYPE (rel->r_info))
4973 {
4974 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4975 + htab->elf.sgotplt->output_offset;
4976 relocation = htab->elf.sgot->output_section->vma
4977 + htab->elf.sgot->output_offset + off - g_o_t;
4978 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4979 && tls_type == GOT_TLS_IE_BOTH)
4980 relocation += 4;
4981 if (r_type == R_386_TLS_IE)
4982 relocation += g_o_t;
4983 unresolved_reloc = FALSE;
4984 }
4985 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4986 {
4987 unsigned int val, type;
4988 bfd_vma roff;
4989
4990 /* GD->IE transition. */
4991 type = *(contents + rel->r_offset - 2);
4992 val = *(contents + rel->r_offset - 1);
4993 if (type == 0x04)
4994 {
4995 /* Change
4996 leal foo@tlsgd(,%ebx,1), %eax
4997 call ___tls_get_addr@PLT
4998 into:
4999 movl %gs:0, %eax
5000 subl $foo@gottpoff(%ebx), %eax. */
5001 val >>= 3;
5002 roff = rel->r_offset - 3;
5003 }
5004 else
5005 {
5006 /* Change
5007 leal foo@tlsgd(%ebx), %eax
5008 call ___tls_get_addr@PLT
5009 nop
5010 or
5011 leal foo@tlsgd(%reg), %eax
5012 call *___tls_get_addr@GOT(%reg)
5013 which may be converted to
5014 addr32 call ___tls_get_addr
5015 into:
5016 movl %gs:0, %eax;
5017 subl $foo@gottpoff(%reg), %eax. */
5018 roff = rel->r_offset - 2;
5019 }
5020 memcpy (contents + roff,
5021 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
5022 contents[roff + 7] = 0x80 | (val & 7);
5023 /* If foo is used only with foo@gotntpoff(%reg) and
5024 foo@indntpoff, but not with foo@gottpoff(%reg), change
5025 subl $foo@gottpoff(%reg), %eax
5026 into:
5027 addl $foo@gotntpoff(%reg), %eax. */
5028 if (tls_type == GOT_TLS_IE_POS)
5029 contents[roff + 6] = 0x03;
5030 bfd_put_32 (output_bfd,
5031 htab->elf.sgot->output_section->vma
5032 + htab->elf.sgot->output_offset + off
5033 - htab->elf.sgotplt->output_section->vma
5034 - htab->elf.sgotplt->output_offset,
5035 contents + roff + 8);
5036 /* Skip R_386_PLT32 and R_386_GOT32X. */
5037 rel++;
5038 wrel++;
5039 continue;
5040 }
5041 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
5042 {
5043 /* GDesc -> IE transition.
5044 It's originally something like:
5045 leal x@tlsdesc(%ebx), %eax
5046
5047 Change it to:
5048 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
5049 or:
5050 movl x@gottpoff(%ebx), %eax # before negl %eax
5051
5052 Registers other than %eax may be set up here. */
5053
5054 bfd_vma roff;
5055
5056 /* First, make sure it's a leal adding ebx to a 32-bit
5057 offset into any register, although it's probably
5058 almost always going to be eax. */
5059 roff = rel->r_offset;
5060
5061 /* Now modify the instruction as appropriate. */
5062 /* To turn a leal into a movl in the form we use it, it
5063 suffices to change the first byte from 0x8d to 0x8b.
5064 aoliva FIXME: should we decide to keep the leal, all
5065 we have to do is remove the statement below, and
5066 adjust the relaxation of R_386_TLS_DESC_CALL. */
5067 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5068
5069 if (tls_type == GOT_TLS_IE_BOTH)
5070 off += 4;
5071
5072 bfd_put_32 (output_bfd,
5073 htab->elf.sgot->output_section->vma
5074 + htab->elf.sgot->output_offset + off
5075 - htab->elf.sgotplt->output_section->vma
5076 - htab->elf.sgotplt->output_offset,
5077 contents + roff);
5078 continue;
5079 }
5080 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
5081 {
5082 /* GDesc -> IE transition.
5083 It's originally:
5084 call *(%eax)
5085
5086 Change it to:
5087 xchg %ax,%ax
5088 or
5089 negl %eax
5090 depending on how we transformed the TLS_GOTDESC above.
5091 */
5092
5093 bfd_vma roff;
5094
5095 roff = rel->r_offset;
5096
5097 /* Now modify the instruction as appropriate. */
5098 if (tls_type != GOT_TLS_IE_NEG)
5099 {
5100 /* xchg %ax,%ax */
5101 bfd_put_8 (output_bfd, 0x66, contents + roff);
5102 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5103 }
5104 else
5105 {
5106 /* negl %eax */
5107 bfd_put_8 (output_bfd, 0xf7, contents + roff);
5108 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
5109 }
5110
5111 continue;
5112 }
5113 else
5114 BFD_ASSERT (FALSE);
5115 break;
5116
5117 case R_386_TLS_LDM:
5118 if (! elf_i386_tls_transition (info, input_bfd,
5119 input_section, contents,
5120 symtab_hdr, sym_hashes,
5121 &r_type, GOT_UNKNOWN, rel,
5122 relend, h, r_symndx, TRUE))
5123 return FALSE;
5124
5125 if (r_type != R_386_TLS_LDM)
5126 {
5127 /* LD->LE transition. Change
5128 leal foo@tlsldm(%ebx) %eax
5129 call ___tls_get_addr@PLT
5130 into:
5131 movl %gs:0, %eax
5132 nop
5133 leal 0(%esi,1), %esi
5134 or change
5135 leal foo@tlsldm(%reg) %eax
5136 call *___tls_get_addr@GOT(%reg)
5137 which may be converted to
5138 addr32 call ___tls_get_addr
5139 into:
5140 movl %gs:0, %eax
5141 leal 0(%esi), %esi */
5142 BFD_ASSERT (r_type == R_386_TLS_LE_32);
5143 if (*(contents + rel->r_offset + 4) == 0xff
5144 || *(contents + rel->r_offset + 4) == 0x67)
5145 memcpy (contents + rel->r_offset - 2,
5146 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5147 else
5148 memcpy (contents + rel->r_offset - 2,
5149 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5150 /* Skip R_386_PC32/R_386_PLT32. */
5151 rel++;
5152 wrel++;
5153 continue;
5154 }
5155
5156 if (htab->elf.sgot == NULL)
5157 abort ();
5158
5159 off = htab->tls_ldm_got.offset;
5160 if (off & 1)
5161 off &= ~1;
5162 else
5163 {
5164 Elf_Internal_Rela outrel;
5165
5166 if (htab->elf.srelgot == NULL)
5167 abort ();
5168
5169 outrel.r_offset = (htab->elf.sgot->output_section->vma
5170 + htab->elf.sgot->output_offset + off);
5171
5172 bfd_put_32 (output_bfd, 0,
5173 htab->elf.sgot->contents + off);
5174 bfd_put_32 (output_bfd, 0,
5175 htab->elf.sgot->contents + off + 4);
5176 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5177 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5178 htab->tls_ldm_got.offset |= 1;
5179 }
5180 relocation = htab->elf.sgot->output_section->vma
5181 + htab->elf.sgot->output_offset + off
5182 - htab->elf.sgotplt->output_section->vma
5183 - htab->elf.sgotplt->output_offset;
5184 unresolved_reloc = FALSE;
5185 break;
5186
5187 case R_386_TLS_LDO_32:
5188 if (!bfd_link_executable (info)
5189 || (input_section->flags & SEC_CODE) == 0)
5190 relocation -= elf_i386_dtpoff_base (info);
5191 else
5192 /* When converting LDO to LE, we must negate. */
5193 relocation = -elf_i386_tpoff (info, relocation);
5194 break;
5195
5196 case R_386_TLS_LE_32:
5197 case R_386_TLS_LE:
5198 if (!bfd_link_executable (info))
5199 {
5200 Elf_Internal_Rela outrel;
5201 asection *sreloc;
5202
5203 outrel.r_offset = rel->r_offset
5204 + input_section->output_section->vma
5205 + input_section->output_offset;
5206 if (h != NULL && h->dynindx != -1)
5207 indx = h->dynindx;
5208 else
5209 indx = 0;
5210 if (r_type == R_386_TLS_LE_32)
5211 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5212 else
5213 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5214 sreloc = elf_section_data (input_section)->sreloc;
5215 if (sreloc == NULL)
5216 abort ();
5217 elf_append_rel (output_bfd, sreloc, &outrel);
5218 if (indx)
5219 continue;
5220 else if (r_type == R_386_TLS_LE_32)
5221 relocation = elf_i386_dtpoff_base (info) - relocation;
5222 else
5223 relocation -= elf_i386_dtpoff_base (info);
5224 }
5225 else if (r_type == R_386_TLS_LE_32)
5226 relocation = elf_i386_tpoff (info, relocation);
5227 else
5228 relocation = -elf_i386_tpoff (info, relocation);
5229 break;
5230
5231 default:
5232 break;
5233 }
5234
5235 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5236 because such sections are not SEC_ALLOC and thus ld.so will
5237 not process them. */
5238 if (unresolved_reloc
5239 && !((input_section->flags & SEC_DEBUGGING) != 0
5240 && h->def_dynamic)
5241 && _bfd_elf_section_offset (output_bfd, info, input_section,
5242 rel->r_offset) != (bfd_vma) -1)
5243 {
5244 _bfd_error_handler
5245 /* xgettext:c-format */
5246 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5247 input_bfd,
5248 input_section,
5249 (long) rel->r_offset,
5250 howto->name,
5251 h->root.root.string);
5252 return FALSE;
5253 }
5254
5255do_relocation:
5256 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5257 contents, rel->r_offset,
5258 relocation, 0);
5259
5260check_relocation_error:
5261 if (r != bfd_reloc_ok)
5262 {
5263 const char *name;
5264
5265 if (h != NULL)
5266 name = h->root.root.string;
5267 else
5268 {
5269 name = bfd_elf_string_from_elf_section (input_bfd,
5270 symtab_hdr->sh_link,
5271 sym->st_name);
5272 if (name == NULL)
5273 return FALSE;
5274 if (*name == '\0')
5275 name = bfd_section_name (input_bfd, sec);
5276 }
5277
5278 if (r == bfd_reloc_overflow)
5279 (*info->callbacks->reloc_overflow)
5280 (info, (h ? &h->root : NULL), name, howto->name,
5281 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5282 else
5283 {
5284 _bfd_error_handler
5285 /* xgettext:c-format */
5286 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5287 input_bfd, input_section,
5288 (long) rel->r_offset, name, (int) r);
5289 return FALSE;
5290 }
5291 }
5292
5293 if (wrel != rel)
5294 *wrel = *rel;
5295 }
5296
5297 if (wrel != rel)
5298 {
5299 Elf_Internal_Shdr *rel_hdr;
5300 size_t deleted = rel - wrel;
5301
5302 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5303 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5304 if (rel_hdr->sh_size == 0)
5305 {
5306 /* It is too late to remove an empty reloc section. Leave
5307 one NONE reloc.
5308 ??? What is wrong with an empty section??? */
5309 rel_hdr->sh_size = rel_hdr->sh_entsize;
5310 deleted -= 1;
5311 }
5312 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5313 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5314 input_section->reloc_count -= deleted;
5315 }
5316
5317 return TRUE;
5318}
5319
5320/* Finish up dynamic symbol handling. We set the contents of various
5321 dynamic sections here. */
5322
5323static bfd_boolean
5324elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5325 struct bfd_link_info *info,
5326 struct elf_link_hash_entry *h,
5327 Elf_Internal_Sym *sym)
5328{
5329 struct elf_i386_link_hash_table *htab;
5330 unsigned plt_entry_size;
5331 const struct elf_i386_backend_data *abed;
5332 struct elf_i386_link_hash_entry *eh;
5333 bfd_boolean local_undefweak;
5334
5335 htab = elf_i386_hash_table (info);
5336 if (htab == NULL)
5337 return FALSE;
5338
5339 abed = get_elf_i386_backend_data (output_bfd);
5340 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5341
5342 eh = (struct elf_i386_link_hash_entry *) h;
5343 if (eh->no_finish_dynamic_symbol)
5344 abort ();
5345
5346 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5347 resolved undefined weak symbols in executable so that their
5348 references have value 0 at run-time. */
5349 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5350 eh->has_got_reloc,
5351 eh);
5352
5353 if (h->plt.offset != (bfd_vma) -1)
5354 {
5355 bfd_vma plt_index;
5356 bfd_vma got_offset;
5357 Elf_Internal_Rela rel;
5358 bfd_byte *loc;
5359 asection *plt, *gotplt, *relplt;
5360
5361 /* When building a static executable, use .iplt, .igot.plt and
5362 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5363 if (htab->elf.splt != NULL)
5364 {
5365 plt = htab->elf.splt;
5366 gotplt = htab->elf.sgotplt;
5367 relplt = htab->elf.srelplt;
5368 }
5369 else
5370 {
5371 plt = htab->elf.iplt;
5372 gotplt = htab->elf.igotplt;
5373 relplt = htab->elf.irelplt;
5374 }
5375
5376 /* This symbol has an entry in the procedure linkage table. Set
5377 it up. */
5378
5379 if ((h->dynindx == -1
5380 && !local_undefweak
5381 && !((h->forced_local || bfd_link_executable (info))
5382 && h->def_regular
5383 && h->type == STT_GNU_IFUNC))
5384 || plt == NULL
5385 || gotplt == NULL
5386 || relplt == NULL)
5387 abort ();
5388
5389 /* Get the index in the procedure linkage table which
5390 corresponds to this symbol. This is the index of this symbol
5391 in all the symbols for which we are making plt entries. The
5392 first entry in the procedure linkage table is reserved.
5393
5394 Get the offset into the .got table of the entry that
5395 corresponds to this function. Each .got entry is 4 bytes.
5396 The first three are reserved.
5397
5398 For static executables, we don't reserve anything. */
5399
5400 if (plt == htab->elf.splt)
5401 {
5402 got_offset = h->plt.offset / plt_entry_size - 1;
5403 got_offset = (got_offset + 3) * 4;
5404 }
5405 else
5406 {
5407 got_offset = h->plt.offset / plt_entry_size;
5408 got_offset = got_offset * 4;
5409 }
5410
5411 /* Fill in the entry in the procedure linkage table. */
5412 if (! bfd_link_pic (info))
5413 {
5414 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5415 abed->plt->plt_entry_size);
5416 bfd_put_32 (output_bfd,
5417 (gotplt->output_section->vma
5418 + gotplt->output_offset
5419 + got_offset),
5420 plt->contents + h->plt.offset
5421 + abed->plt->plt_got_offset);
5422
5423 if (abed->is_vxworks)
5424 {
5425 int s, k, reloc_index;
5426
5427 /* Create the R_386_32 relocation referencing the GOT
5428 for this PLT entry. */
5429
5430 /* S: Current slot number (zero-based). */
5431 s = ((h->plt.offset - abed->plt->plt_entry_size)
5432 / abed->plt->plt_entry_size);
5433 /* K: Number of relocations for PLTResolve. */
5434 if (bfd_link_pic (info))
5435 k = PLTRESOLVE_RELOCS_SHLIB;
5436 else
5437 k = PLTRESOLVE_RELOCS;
5438 /* Skip the PLTresolve relocations, and the relocations for
5439 the other PLT slots. */
5440 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5441 loc = (htab->srelplt2->contents + reloc_index
5442 * sizeof (Elf32_External_Rel));
5443
5444 rel.r_offset = (htab->elf.splt->output_section->vma
5445 + htab->elf.splt->output_offset
5446 + h->plt.offset + 2),
5447 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5448 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5449
5450 /* Create the R_386_32 relocation referencing the beginning of
5451 the PLT for this GOT entry. */
5452 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5453 + htab->elf.sgotplt->output_offset
5454 + got_offset);
5455 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5456 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5457 loc + sizeof (Elf32_External_Rel));
5458 }
5459 }
5460 else
5461 {
5462 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5463 abed->plt->plt_entry_size);
5464 bfd_put_32 (output_bfd, got_offset,
5465 plt->contents + h->plt.offset
5466 + abed->plt->plt_got_offset);
5467 }
5468
5469 /* Fill in the entry in the global offset table. Leave the entry
5470 as zero for undefined weak symbol in PIE. No PLT relocation
5471 against undefined weak symbol in PIE. */
5472 if (!local_undefweak)
5473 {
5474 bfd_put_32 (output_bfd,
5475 (plt->output_section->vma
5476 + plt->output_offset
5477 + h->plt.offset
5478 + abed->plt->plt_lazy_offset),
5479 gotplt->contents + got_offset);
5480
5481 /* Fill in the entry in the .rel.plt section. */
5482 rel.r_offset = (gotplt->output_section->vma
5483 + gotplt->output_offset
5484 + got_offset);
5485 if (h->dynindx == -1
5486 || ((bfd_link_executable (info)
5487 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5488 && h->def_regular
5489 && h->type == STT_GNU_IFUNC))
5490 {
5491 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5492 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5493 in the .got.plt section. */
5494 bfd_put_32 (output_bfd,
5495 (h->root.u.def.value
5496 + h->root.u.def.section->output_section->vma
5497 + h->root.u.def.section->output_offset),
5498 gotplt->contents + got_offset);
5499 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5500 /* R_386_IRELATIVE comes last. */
5501 plt_index = htab->next_irelative_index--;
5502 }
5503 else
5504 {
5505 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5506 plt_index = htab->next_jump_slot_index++;
5507 }
5508
5509 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5510 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5511
5512 /* Don't fill PLT entry for static executables. */
5513 if (plt == htab->elf.splt)
5514 {
5515 bfd_put_32 (output_bfd,
5516 plt_index * sizeof (Elf32_External_Rel),
5517 plt->contents + h->plt.offset
5518 + abed->plt->plt_reloc_offset);
5519 bfd_put_32 (output_bfd, - (h->plt.offset
5520 + abed->plt->plt_plt_offset + 4),
5521 plt->contents + h->plt.offset
5522 + abed->plt->plt_plt_offset);
5523 }
5524 }
5525 }
5526 else if (eh->plt_got.offset != (bfd_vma) -1)
5527 {
5528 bfd_vma got_offset, plt_offset;
5529 asection *plt, *got, *gotplt;
5530 const bfd_byte *got_plt_entry;
5531
5532 /* Offset of displacement of the indirect jump. */
5533 bfd_vma plt_got_offset = 2;
5534
5535 /* Set the entry in the GOT procedure linkage table. */
5536 plt = htab->plt_got;
5537 got = htab->elf.sgot;
5538 gotplt = htab->elf.sgotplt;
5539 got_offset = h->got.offset;
5540
5541 if (got_offset == (bfd_vma) -1
5542 || plt == NULL
5543 || got == NULL
5544 || gotplt == NULL)
5545 abort ();
5546
5547 /* Fill in the entry in the GOT procedure linkage table. */
5548 if (! bfd_link_pic (info))
5549 {
5550 got_plt_entry = elf_i386_got_plt_entry;
5551 got_offset += got->output_section->vma + got->output_offset;
5552 }
5553 else
5554 {
5555 got_plt_entry = elf_i386_pic_got_plt_entry;
5556 got_offset += (got->output_section->vma
5557 + got->output_offset
5558 - gotplt->output_section->vma
5559 - gotplt->output_offset);
5560 }
5561
5562 plt_offset = eh->plt_got.offset;
5563 memcpy (plt->contents + plt_offset, got_plt_entry,
5564 sizeof (elf_i386_got_plt_entry));
5565 bfd_put_32 (output_bfd, got_offset,
5566 plt->contents + plt_offset + plt_got_offset);
5567 }
5568
5569 if (!local_undefweak
5570 && !h->def_regular
5571 && (h->plt.offset != (bfd_vma) -1
5572 || eh->plt_got.offset != (bfd_vma) -1))
5573 {
5574 /* Mark the symbol as undefined, rather than as defined in
5575 the .plt section. Leave the value if there were any
5576 relocations where pointer equality matters (this is a clue
5577 for the dynamic linker, to make function pointer
5578 comparisons work between an application and shared
5579 library), otherwise set it to zero. If a function is only
5580 called from a binary, there is no need to slow down
5581 shared libraries because of that. */
5582 sym->st_shndx = SHN_UNDEF;
5583 if (!h->pointer_equality_needed)
5584 sym->st_value = 0;
5585 }
5586
5587 /* Don't generate dynamic GOT relocation against undefined weak
5588 symbol in executable. */
5589 if (h->got.offset != (bfd_vma) -1
5590 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5591 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5592 && !local_undefweak)
5593 {
5594 Elf_Internal_Rela rel;
5595 asection *relgot = htab->elf.srelgot;
5596
5597 /* This symbol has an entry in the global offset table. Set it
5598 up. */
5599
5600 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5601 abort ();
5602
5603 rel.r_offset = (htab->elf.sgot->output_section->vma
5604 + htab->elf.sgot->output_offset
5605 + (h->got.offset & ~(bfd_vma) 1));
5606
5607 /* If this is a static link, or it is a -Bsymbolic link and the
5608 symbol is defined locally or was forced to be local because
5609 of a version file, we just want to emit a RELATIVE reloc.
5610 The entry in the global offset table will already have been
5611 initialized in the relocate_section function. */
5612 if (h->def_regular
5613 && h->type == STT_GNU_IFUNC)
5614 {
5615 if (h->plt.offset == (bfd_vma) -1)
5616 {
5617 /* STT_GNU_IFUNC is referenced without PLT. */
5618 if (htab->elf.splt == NULL)
5619 {
5620 /* use .rel[a].iplt section to store .got relocations
5621 in static executable. */
5622 relgot = htab->elf.irelplt;
5623 }
5624 if (SYMBOL_REFERENCES_LOCAL (info, h))
5625 {
5626 bfd_put_32 (output_bfd,
5627 (h->root.u.def.value
5628 + h->root.u.def.section->output_section->vma
5629 + h->root.u.def.section->output_offset),
5630 htab->elf.sgot->contents + h->got.offset);
5631 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5632 }
5633 else
5634 goto do_glob_dat;
5635 }
5636 else if (bfd_link_pic (info))
5637 {
5638 /* Generate R_386_GLOB_DAT. */
5639 goto do_glob_dat;
5640 }
5641 else
5642 {
5643 asection *plt;
5644
5645 if (!h->pointer_equality_needed)
5646 abort ();
5647
5648 /* For non-shared object, we can't use .got.plt, which
5649 contains the real function addres if we need pointer
5650 equality. We load the GOT entry with the PLT entry. */
5651 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5652 bfd_put_32 (output_bfd,
5653 (plt->output_section->vma
5654 + plt->output_offset + h->plt.offset),
5655 htab->elf.sgot->contents + h->got.offset);
5656 return TRUE;
5657 }
5658 }
5659 else if (bfd_link_pic (info)
5660 && SYMBOL_REFERENCES_LOCAL (info, h))
5661 {
5662 BFD_ASSERT((h->got.offset & 1) != 0);
5663 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5664 }
5665 else
5666 {
5667 BFD_ASSERT((h->got.offset & 1) == 0);
5668do_glob_dat:
5669 bfd_put_32 (output_bfd, (bfd_vma) 0,
5670 htab->elf.sgot->contents + h->got.offset);
5671 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5672 }
5673
5674 elf_append_rel (output_bfd, relgot, &rel);
5675 }
5676
5677 if (h->needs_copy)
5678 {
5679 Elf_Internal_Rela rel;
5680 asection *s;
5681
5682 /* This symbol needs a copy reloc. Set it up. */
5683
5684 if (h->dynindx == -1
5685 || (h->root.type != bfd_link_hash_defined
5686 && h->root.type != bfd_link_hash_defweak)
5687 || htab->elf.srelbss == NULL
5688 || htab->elf.sreldynrelro == NULL)
5689 abort ();
5690
5691 rel.r_offset = (h->root.u.def.value
5692 + h->root.u.def.section->output_section->vma
5693 + h->root.u.def.section->output_offset);
5694 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5695 if (h->root.u.def.section == htab->elf.sdynrelro)
5696 s = htab->elf.sreldynrelro;
5697 else
5698 s = htab->elf.srelbss;
5699 elf_append_rel (output_bfd, s, &rel);
5700 }
5701
5702 return TRUE;
5703}
5704
5705/* Finish up local dynamic symbol handling. We set the contents of
5706 various dynamic sections here. */
5707
5708static bfd_boolean
5709elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5710{
5711 struct elf_link_hash_entry *h
5712 = (struct elf_link_hash_entry *) *slot;
5713 struct bfd_link_info *info
5714 = (struct bfd_link_info *) inf;
5715
5716 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5717 h, NULL);
5718}
5719
5720/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5721 here since undefined weak symbol may not be dynamic and may not be
5722 called for elf_i386_finish_dynamic_symbol. */
5723
5724static bfd_boolean
5725elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5726 void *inf)
5727{
5728 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5729 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5730
5731 if (h->root.type != bfd_link_hash_undefweak
5732 || h->dynindx != -1)
5733 return TRUE;
5734
5735 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5736 info, h, NULL);
5737}
5738
5739/* Used to decide how to sort relocs in an optimal manner for the
5740 dynamic linker, before writing them out. */
5741
5742static enum elf_reloc_type_class
5743elf_i386_reloc_type_class (const struct bfd_link_info *info,
5744 const asection *rel_sec ATTRIBUTE_UNUSED,
5745 const Elf_Internal_Rela *rela)
5746{
5747 bfd *abfd = info->output_bfd;
5748 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5749 struct elf_link_hash_table *htab = elf_hash_table (info);
5750
5751 if (htab->dynsym != NULL
5752 && htab->dynsym->contents != NULL)
5753 {
5754 /* Check relocation against STT_GNU_IFUNC symbol if there are
5755 dynamic symbols. */
5756 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5757 if (r_symndx != STN_UNDEF)
5758 {
5759 Elf_Internal_Sym sym;
5760 if (!bed->s->swap_symbol_in (abfd,
5761 (htab->dynsym->contents
5762 + r_symndx * sizeof (Elf32_External_Sym)),
5763 0, &sym))
5764 abort ();
5765
5766 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5767 return reloc_class_ifunc;
5768 }
5769 }
5770
5771 switch (ELF32_R_TYPE (rela->r_info))
5772 {
5773 case R_386_IRELATIVE:
5774 return reloc_class_ifunc;
5775 case R_386_RELATIVE:
5776 return reloc_class_relative;
5777 case R_386_JUMP_SLOT:
5778 return reloc_class_plt;
5779 case R_386_COPY:
5780 return reloc_class_copy;
5781 default:
5782 return reloc_class_normal;
5783 }
5784}
5785
5786/* Finish up the dynamic sections. */
5787
5788static bfd_boolean
5789elf_i386_finish_dynamic_sections (bfd *output_bfd,
5790 struct bfd_link_info *info)
5791{
5792 struct elf_i386_link_hash_table *htab;
5793 bfd *dynobj;
5794 asection *sdyn;
5795 const struct elf_i386_backend_data *abed;
5796
5797 htab = elf_i386_hash_table (info);
5798 if (htab == NULL)
5799 return FALSE;
5800
5801 dynobj = htab->elf.dynobj;
5802 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5803 abed = get_elf_i386_backend_data (output_bfd);
5804
5805 if (htab->elf.dynamic_sections_created)
5806 {
5807 Elf32_External_Dyn *dyncon, *dynconend;
5808
5809 if (sdyn == NULL || htab->elf.sgot == NULL)
5810 abort ();
5811
5812 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5813 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5814 for (; dyncon < dynconend; dyncon++)
5815 {
5816 Elf_Internal_Dyn dyn;
5817 asection *s;
5818
5819 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5820
5821 switch (dyn.d_tag)
5822 {
5823 default:
5824 if (abed->is_vxworks
5825 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5826 break;
5827 continue;
5828
5829 case DT_PLTGOT:
5830 s = htab->elf.sgotplt;
5831 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5832 break;
5833
5834 case DT_JMPREL:
5835 s = htab->elf.srelplt;
5836 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5837 break;
5838
5839 case DT_PLTRELSZ:
5840 s = htab->elf.srelplt;
5841 dyn.d_un.d_val = s->size;
5842 break;
5843 }
5844
5845 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5846 }
5847
5848 if (htab->elf.splt && htab->elf.splt->size > 0)
5849 {
5850 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5851 really seem like the right value. */
5852 elf_section_data (htab->elf.splt->output_section)
5853 ->this_hdr.sh_entsize = 4;
5854
5855 /* Fill in the special first entry in the procedure linkage
5856 table. */
5857 if (bfd_link_pic (info))
5858 {
5859 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5860 abed->plt->plt0_entry_size);
5861 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5862 abed->plt0_pad_byte,
5863 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5864 }
5865 else
5866 {
5867 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5868 abed->plt->plt0_entry_size);
5869 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5870 abed->plt0_pad_byte,
5871 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5872 bfd_put_32 (output_bfd,
5873 (htab->elf.sgotplt->output_section->vma
5874 + htab->elf.sgotplt->output_offset
5875 + 4),
5876 htab->elf.splt->contents
5877 + abed->plt->plt0_got1_offset);
5878 bfd_put_32 (output_bfd,
5879 (htab->elf.sgotplt->output_section->vma
5880 + htab->elf.sgotplt->output_offset
5881 + 8),
5882 htab->elf.splt->contents
5883 + abed->plt->plt0_got2_offset);
5884
5885 if (abed->is_vxworks)
5886 {
5887 Elf_Internal_Rela rel;
5888 int num_plts = (htab->elf.splt->size
5889 / abed->plt->plt_entry_size) - 1;
5890 unsigned char *p;
5891
5892 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5893 On IA32 we use REL relocations so the addend goes in
5894 the PLT directly. */
5895 rel.r_offset = (htab->elf.splt->output_section->vma
5896 + htab->elf.splt->output_offset
5897 + abed->plt->plt0_got1_offset);
5898 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5899 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5900 htab->srelplt2->contents);
5901 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5902 rel.r_offset = (htab->elf.splt->output_section->vma
5903 + htab->elf.splt->output_offset
5904 + abed->plt->plt0_got2_offset);
5905 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5906 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5907 htab->srelplt2->contents +
5908 sizeof (Elf32_External_Rel));
5909
5910 /* Correct the .rel.plt.unloaded relocations. */
5911 p = htab->srelplt2->contents;
5912 if (bfd_link_pic (info))
5913 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5914 else
5915 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5916
5917 for (; num_plts; num_plts--)
5918 {
5919 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5920 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5921 R_386_32);
5922 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5923 p += sizeof (Elf32_External_Rel);
5924
5925 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5926 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
5927 R_386_32);
5928 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5929 p += sizeof (Elf32_External_Rel);
5930 }
5931 }
5932 }
5933 }
5934 }
5935
5936 if (htab->elf.sgotplt)
5937 {
5938 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5939 {
5940 _bfd_error_handler
5941 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5942 return FALSE;
5943 }
5944
5945 /* Fill in the first three entries in the global offset table. */
5946 if (htab->elf.sgotplt->size > 0)
5947 {
5948 bfd_put_32 (output_bfd,
5949 (sdyn == NULL ? 0
5950 : sdyn->output_section->vma + sdyn->output_offset),
5951 htab->elf.sgotplt->contents);
5952 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5953 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5954 }
5955
5956 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5957 }
5958
5959 /* Adjust .eh_frame for .plt section. */
5960 if (htab->plt_eh_frame != NULL
5961 && htab->plt_eh_frame->contents != NULL)
5962 {
5963 if (htab->elf.splt != NULL
5964 && htab->elf.splt->size != 0
5965 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5966 && htab->elf.splt->output_section != NULL
5967 && htab->plt_eh_frame->output_section != NULL)
5968 {
5969 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5970 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5971 + htab->plt_eh_frame->output_offset
5972 + PLT_FDE_START_OFFSET;
5973 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5974 htab->plt_eh_frame->contents
5975 + PLT_FDE_START_OFFSET);
5976 }
5977 if (htab->plt_eh_frame->sec_info_type
5978 == SEC_INFO_TYPE_EH_FRAME)
5979 {
5980 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5981 htab->plt_eh_frame,
5982 htab->plt_eh_frame->contents))
5983 return FALSE;
5984 }
5985 }
5986
5987 /* Adjust .eh_frame for .plt.got section. */
5988 if (htab->plt_got_eh_frame != NULL
5989 && htab->plt_got_eh_frame->contents != NULL)
5990 {
5991 if (htab->plt_got != NULL
5992 && htab->plt_got->size != 0
5993 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5994 && htab->plt_got->output_section != NULL
5995 && htab->plt_got_eh_frame->output_section != NULL)
5996 {
5997 bfd_vma plt_start = htab->plt_got->output_section->vma;
5998 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5999 + htab->plt_got_eh_frame->output_offset
6000 + PLT_FDE_START_OFFSET;
6001 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6002 htab->plt_got_eh_frame->contents
6003 + PLT_FDE_START_OFFSET);
6004 }
6005 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6006 {
6007 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6008 htab->plt_got_eh_frame,
6009 htab->plt_got_eh_frame->contents))
6010 return FALSE;
6011 }
6012 }
6013
6014 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6015 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
6016
6017 /* Fill PLT entries for undefined weak symbols in PIE. */
6018 if (bfd_link_pie (info))
6019 bfd_hash_traverse (&info->hash->table,
6020 elf_i386_pie_finish_undefweak_symbol,
6021 info);
6022
6023 return TRUE;
6024}
6025
6026/* Fill PLT/GOT entries and allocate dynamic relocations for local
6027 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6028 It has to be done before elf_link_sort_relocs is called so that
6029 dynamic relocations are properly sorted. */
6030
6031static bfd_boolean
6032elf_i386_output_arch_local_syms
6033 (bfd *output_bfd ATTRIBUTE_UNUSED,
6034 struct bfd_link_info *info,
6035 void *flaginfo ATTRIBUTE_UNUSED,
6036 int (*func) (void *, const char *,
6037 Elf_Internal_Sym *,
6038 asection *,
6039 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6040{
6041 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
6042 if (htab == NULL)
6043 return FALSE;
6044
6045 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6046 htab_traverse (htab->loc_hash_table,
6047 elf_i386_finish_local_dynamic_symbol,
6048 info);
6049
6050 return TRUE;
6051}
6052
6053/* Return an array of PLT entry symbol values. */
6054
6055static bfd_vma *
6056elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6057 asection *relplt)
6058{
6059 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6060 arelent *p;
6061 long count, i;
6062 bfd_vma *plt_sym_val;
6063 bfd_vma plt_offset;
6064 bfd_byte *plt_contents;
6065 const struct elf_i386_backend_data *bed
6066 = get_elf_i386_backend_data (abfd);
6067 Elf_Internal_Shdr *hdr;
6068
6069 /* Get the .plt section contents. */
6070 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6071 if (plt_contents == NULL)
6072 return NULL;
6073 if (!bfd_get_section_contents (abfd, (asection *) plt,
6074 plt_contents, 0, plt->size))
6075 {
6076bad_return:
6077 free (plt_contents);
6078 return NULL;
6079 }
6080
6081 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6082 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6083 goto bad_return;
6084
6085 hdr = &elf_section_data (relplt)->this_hdr;
6086 count = relplt->size / hdr->sh_entsize;
6087
6088 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6089 if (plt_sym_val == NULL)
6090 goto bad_return;
6091
6092 for (i = 0; i < count; i++)
6093 plt_sym_val[i] = -1;
6094
6095 plt_offset = bed->plt->plt_entry_size;
6096 p = relplt->relocation;
6097 for (i = 0; i < count; i++, p++)
6098 {
6099 long reloc_index;
6100
6101 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6102 if (p->howto == NULL)
6103 continue;
6104
6105 if (p->howto->type != R_386_JUMP_SLOT
6106 && p->howto->type != R_386_IRELATIVE)
6107 continue;
6108
6109 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6110 + bed->plt->plt_reloc_offset));
6111 reloc_index /= sizeof (Elf32_External_Rel);
6112 if (reloc_index < count)
6113 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6114
6115 plt_offset += bed->plt->plt_entry_size;
6116
6117 /* PR binutils/18437: Skip extra relocations in the .rel.plt
6118 section. */
6119 if (plt_offset >= plt->size)
6120 break;
6121 }
6122
6123 free (plt_contents);
6124
6125 return plt_sym_val;
6126}
6127
6128/* Similar to _bfd_elf_get_synthetic_symtab. */
6129
6130static long
6131elf_i386_get_synthetic_symtab (bfd *abfd,
6132 long symcount,
6133 asymbol **syms,
6134 long dynsymcount,
6135 asymbol **dynsyms,
6136 asymbol **ret)
6137{
6138 asection *plt = bfd_get_section_by_name (abfd, ".plt");
6139 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6140 dynsymcount, dynsyms, ret,
6141 plt,
6142 elf_i386_get_plt_sym_val);
6143}
6144
6145/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6146
6147static bfd_boolean
6148elf_i386_hash_symbol (struct elf_link_hash_entry *h)
6149{
6150 if (h->plt.offset != (bfd_vma) -1
6151 && !h->def_regular
6152 && !h->pointer_equality_needed)
6153 return FALSE;
6154
6155 return _bfd_elf_hash_symbol (h);
6156}
6157
6158/* Parse i386 GNU properties. */
6159
6160static enum elf_property_kind
6161elf_i386_parse_gnu_properties (bfd *abfd, unsigned int type,
6162 bfd_byte *ptr, unsigned int datasz)
6163{
6164 elf_property *prop;
6165
6166 switch (type)
6167 {
6168 case GNU_PROPERTY_X86_ISA_1_USED:
6169 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6170 if (datasz != 4)
6171 {
6172 _bfd_error_handler
6173 ((type == GNU_PROPERTY_X86_ISA_1_USED
6174 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6175 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6176 abfd, datasz);
6177 return property_corrupt;
6178 }
6179 prop = _bfd_elf_get_property (abfd, type, datasz);
6180 prop->u.number = bfd_h_get_32 (abfd, ptr);
6181 prop->pr_kind = property_number;
6182 break;
6183
6184 default:
6185 return property_ignored;
6186 }
6187
6188 return property_number;
6189}
6190
6191/* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6192 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6193 should be merged with ABFD. */
6194
6195static bfd_boolean
6196elf_i386_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
6197 elf_property *aprop,
6198 elf_property *bprop)
6199{
6200 unsigned int number;
6201 bfd_boolean updated = FALSE;
6202 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6203
6204 switch (pr_type)
6205 {
6206 case GNU_PROPERTY_X86_ISA_1_USED:
6207 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6208 if (aprop != NULL && bprop != NULL)
6209 {
6210 number = aprop->u.number;
6211 aprop->u.number = number | bprop->u.number;
6212 updated = number != (unsigned int) aprop->u.number;
6213 }
6214 else
6215 {
6216 /* Return TRUE if APROP is NULL to indicate that BPROP should
6217 be added to ABFD. */
6218 updated = aprop == NULL;
6219 }
6220 break;
6221
6222 default:
6223 /* Never should happen. */
6224 abort ();
6225 }
6226
6227 return updated;
6228}
6229
6230#define TARGET_LITTLE_SYM i386_elf32_vec
6231#define TARGET_LITTLE_NAME "elf32-i386"
6232#define ELF_ARCH bfd_arch_i386
6233#define ELF_TARGET_ID I386_ELF_DATA
6234#define ELF_MACHINE_CODE EM_386
6235#define ELF_MAXPAGESIZE 0x1000
6236
6237#define elf_backend_can_gc_sections 1
6238#define elf_backend_can_refcount 1
6239#define elf_backend_want_got_plt 1
6240#define elf_backend_plt_readonly 1
6241#define elf_backend_want_plt_sym 0
6242#define elf_backend_got_header_size 12
6243#define elf_backend_plt_alignment 4
6244#define elf_backend_dtrel_excludes_plt 1
6245#define elf_backend_extern_protected_data 1
6246#define elf_backend_caches_rawsize 1
6247#define elf_backend_want_dynrelro 1
6248
6249/* Support RELA for objdump of prelink objects. */
6250#define elf_info_to_howto elf_i386_info_to_howto_rel
6251#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
6252
6253#define bfd_elf32_mkobject elf_i386_mkobject
6254
6255#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
6256#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
6257#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
6258#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
6259#define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
6260
6261#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
6262#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
6263#define elf_backend_check_relocs elf_i386_check_relocs
6264#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
6265#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
6266#define elf_backend_fake_sections elf_i386_fake_sections
6267#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
6268#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
6269#define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
6270#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
6271#define elf_backend_grok_prstatus elf_i386_grok_prstatus
6272#define elf_backend_grok_psinfo elf_i386_grok_psinfo
6273#define elf_backend_reloc_type_class elf_i386_reloc_type_class
6274#define elf_backend_relocate_section elf_i386_relocate_section
6275#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
6276#define elf_backend_always_size_sections elf_i386_always_size_sections
6277#define elf_backend_omit_section_dynsym \
6278 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6279#define elf_backend_hash_symbol elf_i386_hash_symbol
6280#define elf_backend_fixup_symbol elf_i386_fixup_symbol
6281#define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
6282#define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
6283
6284#include "elf32-target.h"
6285
6286/* FreeBSD support. */
6287
6288#undef TARGET_LITTLE_SYM
6289#define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
6290#undef TARGET_LITTLE_NAME
6291#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6292#undef ELF_OSABI
6293#define ELF_OSABI ELFOSABI_FREEBSD
6294
6295/* The kernel recognizes executables as valid only if they carry a
6296 "FreeBSD" label in the ELF header. So we put this label on all
6297 executables and (for simplicity) also all other object files. */
6298
6299static void
6300elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6301{
6302 _bfd_elf_post_process_headers (abfd, info);
6303
6304#ifdef OLD_FREEBSD_ABI_LABEL
6305 {
6306 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6307 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6308 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6309 }
6310#endif
6311}
6312
6313#undef elf_backend_post_process_headers
6314#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6315#undef elf32_bed
6316#define elf32_bed elf32_i386_fbsd_bed
6317
6318#undef elf_backend_add_symbol_hook
6319
6320#include "elf32-target.h"
6321
6322/* Solaris 2. */
6323
6324#undef TARGET_LITTLE_SYM
6325#define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6326#undef TARGET_LITTLE_NAME
6327#define TARGET_LITTLE_NAME "elf32-i386-sol2"
6328
6329#undef elf_backend_post_process_headers
6330
6331/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6332 objects won't be recognized. */
6333#undef ELF_OSABI
6334
6335#undef elf32_bed
6336#define elf32_bed elf32_i386_sol2_bed
6337
6338/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6339 boundary. */
6340#undef elf_backend_static_tls_alignment
6341#define elf_backend_static_tls_alignment 8
6342
6343/* The Solaris 2 ABI requires a plt symbol on all platforms.
6344
6345 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6346 File, p.63. */
6347#undef elf_backend_want_plt_sym
6348#define elf_backend_want_plt_sym 1
6349
6350#undef elf_backend_strtab_flags
6351#define elf_backend_strtab_flags SHF_STRINGS
6352
6353/* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6354 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6355 FALSE otherwise. ISECTION is the best guess matching section from the
6356 input bfd IBFD, but it might be NULL. */
6357
6358static bfd_boolean
6359elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6360 bfd *obfd ATTRIBUTE_UNUSED,
6361 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6362 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6363{
6364 /* PR 19938: FIXME: Need to add code for setting the sh_info
6365 and sh_link fields of Solaris specific section types. */
6366 return FALSE;
6367
6368 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6369 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6370
6371http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6372
6373 The following values should be set:
6374
6375Type Link Info
6376-----------------------------------------------------------------------------
6377SHT_SUNW_ancillary The section header index of 0
6378 [0x6fffffee] the associated string table.
6379
6380SHT_SUNW_capinfo The section header index of For a dynamic object, the
6381 [0x6ffffff0] the associated symbol table. section header index of
6382 the associated
6383 SHT_SUNW_capchain table,
6384 otherwise 0.
6385
6386SHT_SUNW_symsort The section header index of 0
6387 [0x6ffffff1] the associated symbol table.
6388
6389SHT_SUNW_tlssort The section header index of 0
6390 [0x6ffffff2] the associated symbol table.
6391
6392SHT_SUNW_LDYNSYM The section header index of One greater than the
6393 [0x6ffffff3] the associated string table. symbol table index of the
6394 This index is the same string last local symbol,
6395 table used by the SHT_DYNSYM STB_LOCAL. Since
6396 section. SHT_SUNW_LDYNSYM only
6397 contains local symbols,
6398 sh_info is equivalent to
6399 the number of symbols in
6400 the table.
6401
6402SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6403 [0x6ffffff5] the section header index of to named strings, the
6404 the associated section header index of
6405 SHT_SUNW_capinfo table, the associated string
6406 otherwise 0. table, otherwise 0.
6407
6408SHT_SUNW_move The section header index of 0
6409 [0x6ffffffa] the associated symbol table.
6410
6411SHT_SUNW_COMDAT 0 0
6412 [0x6ffffffb]
6413
6414SHT_SUNW_syminfo The section header index of The section header index
6415 [0x6ffffffc] the associated symbol table. of the associated
6416 .dynamic section.
6417
6418SHT_SUNW_verdef The section header index of The number of version
6419 [0x6ffffffd] the associated string table. definitions within the
6420 section.
6421
6422SHT_SUNW_verneed The section header index of The number of version
6423 [0x6ffffffe] the associated string table. dependencies within the
6424 section.
6425
6426SHT_SUNW_versym The section header index of 0
6427 [0x6fffffff] the associated symbol table. */
6428}
6429
6430#undef elf_backend_copy_special_section_fields
6431#define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6432
6433#include "elf32-target.h"
6434
6435/* Intel MCU support. */
6436
6437static bfd_boolean
6438elf32_iamcu_elf_object_p (bfd *abfd)
6439{
6440 /* Set the right machine number for an IAMCU elf32 file. */
6441 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6442 return TRUE;
6443}
6444
6445#undef TARGET_LITTLE_SYM
6446#define TARGET_LITTLE_SYM iamcu_elf32_vec
6447#undef TARGET_LITTLE_NAME
6448#define TARGET_LITTLE_NAME "elf32-iamcu"
6449#undef ELF_ARCH
6450#define ELF_ARCH bfd_arch_iamcu
6451
6452#undef ELF_MACHINE_CODE
6453#define ELF_MACHINE_CODE EM_IAMCU
6454
6455#undef ELF_OSABI
6456
6457#undef elf32_bed
6458#define elf32_bed elf32_iamcu_bed
6459
6460#undef elf_backend_object_p
6461#define elf_backend_object_p elf32_iamcu_elf_object_p
6462
6463#undef elf_backend_static_tls_alignment
6464
6465#undef elf_backend_want_plt_sym
6466#define elf_backend_want_plt_sym 0
6467
6468#undef elf_backend_strtab_flags
6469#undef elf_backend_copy_special_section_fields
6470
6471#include "elf32-target.h"
6472
6473/* Restore defaults. */
6474#undef ELF_ARCH
6475#define ELF_ARCH bfd_arch_i386
6476#undef ELF_MACHINE_CODE
6477#define ELF_MACHINE_CODE EM_386
6478
6479/* Native Client support. */
6480
6481#undef TARGET_LITTLE_SYM
6482#define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6483#undef TARGET_LITTLE_NAME
6484#define TARGET_LITTLE_NAME "elf32-i386-nacl"
6485#undef elf32_bed
6486#define elf32_bed elf32_i386_nacl_bed
6487
6488#undef ELF_MAXPAGESIZE
6489#define ELF_MAXPAGESIZE 0x10000
6490
6491/* Restore defaults. */
6492#undef ELF_OSABI
6493#undef elf_backend_want_plt_sym
6494#define elf_backend_want_plt_sym 0
6495#undef elf_backend_post_process_headers
6496#undef elf_backend_static_tls_alignment
6497
6498/* NaCl uses substantially different PLT entries for the same effects. */
6499
6500#undef elf_backend_plt_alignment
6501#define elf_backend_plt_alignment 5
6502#define NACL_PLT_ENTRY_SIZE 64
6503#define NACLMASK 0xe0 /* 32-byte alignment mask. */
6504
6505static const bfd_byte elf_i386_nacl_plt0_entry[] =
6506 {
6507 0xff, 0x35, /* pushl contents of address */
6508 0, 0, 0, 0, /* replaced with address of .got + 4. */
6509 0x8b, 0x0d, /* movl contents of address, %ecx */
6510 0, 0, 0, 0, /* replaced with address of .got + 8. */
6511 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6512 0xff, 0xe1 /* jmp *%ecx */
6513 };
6514
6515static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6516 {
6517 0x8b, 0x0d, /* movl contents of address, %ecx */
6518 0, 0, 0, 0, /* replaced with GOT slot address. */
6519 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6520 0xff, 0xe1, /* jmp *%ecx */
6521
6522 /* Pad to the next 32-byte boundary with nop instructions. */
6523 0x90,
6524 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6525 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6526
6527 /* Lazy GOT entries point here (32-byte aligned). */
6528 0x68, /* pushl immediate */
6529 0, 0, 0, 0, /* replaced with reloc offset. */
6530 0xe9, /* jmp relative */
6531 0, 0, 0, 0, /* replaced with offset to .plt. */
6532
6533 /* Pad to the next 32-byte boundary with nop instructions. */
6534 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6535 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6536 0x90, 0x90
6537 };
6538
6539static const bfd_byte
6540elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6541 {
6542 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6543 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6544 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6545 0xff, 0xe1, /* jmp *%ecx */
6546
6547 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6548 so pad to that size with nop instructions. */
6549 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6550 };
6551
6552static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6553 {
6554 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6555 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6556 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6557 0xff, 0xe1, /* jmp *%ecx */
6558
6559 /* Pad to the next 32-byte boundary with nop instructions. */
6560 0x90,
6561 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6562 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6563
6564 /* Lazy GOT entries point here (32-byte aligned). */
6565 0x68, /* pushl immediate */
6566 0, 0, 0, 0, /* replaced with offset into relocation table. */
6567 0xe9, /* jmp relative */
6568 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6569
6570 /* Pad to the next 32-byte boundary with nop instructions. */
6571 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6572 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6573 0x90, 0x90
6574 };
6575
6576static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6577 {
6578#if (PLT_CIE_LENGTH != 20 \
6579 || PLT_FDE_LENGTH != 36 \
6580 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6581 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6582# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6583#endif
6584 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6585 0, 0, 0, 0, /* CIE ID */
6586 1, /* CIE version */
6587 'z', 'R', 0, /* Augmentation string */
6588 1, /* Code alignment factor */
6589 0x7c, /* Data alignment factor: -4 */
6590 8, /* Return address column */
6591 1, /* Augmentation size */
6592 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6593 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6594 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6595 DW_CFA_nop, DW_CFA_nop,
6596
6597 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6598 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6599 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6600 0, 0, 0, 0, /* .plt size goes here */
6601 0, /* Augmentation size */
6602 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6603 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6604 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6605 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6606 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6607 13, /* Block length */
6608 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6609 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6610 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6611 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6612 DW_CFA_nop, DW_CFA_nop
6613 };
6614
6615static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6616 {
6617 elf_i386_nacl_plt0_entry, /* plt0_entry */
6618 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6619 2, /* plt0_got1_offset */
6620 8, /* plt0_got2_offset */
6621 elf_i386_nacl_plt_entry, /* plt_entry */
6622 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6623 2, /* plt_got_offset */
6624 33, /* plt_reloc_offset */
6625 38, /* plt_plt_offset */
6626 32, /* plt_lazy_offset */
6627 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6628 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6629 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6630 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6631 NULL, /* eh_frame_plt_got */
6632 0, /* eh_frame_plt_got_size */
6633 };
6634
6635static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6636 {
6637 &elf_i386_nacl_plt, /* plt */
6638 0x90, /* plt0_pad_byte: nop insn */
6639 0, /* is_vxworks */
6640 };
6641
6642static bfd_boolean
6643elf32_i386_nacl_elf_object_p (bfd *abfd)
6644{
6645 /* Set the right machine number for a NaCl i386 ELF32 file. */
6646 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6647 return TRUE;
6648}
6649
6650#undef elf_backend_arch_data
6651#define elf_backend_arch_data &elf_i386_nacl_arch_bed
6652
6653#undef elf_backend_object_p
6654#define elf_backend_object_p elf32_i386_nacl_elf_object_p
6655#undef elf_backend_modify_segment_map
6656#define elf_backend_modify_segment_map nacl_modify_segment_map
6657#undef elf_backend_modify_program_headers
6658#define elf_backend_modify_program_headers nacl_modify_program_headers
6659#undef elf_backend_final_write_processing
6660#define elf_backend_final_write_processing nacl_final_write_processing
6661
6662#include "elf32-target.h"
6663
6664/* Restore defaults. */
6665#undef elf_backend_object_p
6666#undef elf_backend_modify_segment_map
6667#undef elf_backend_modify_program_headers
6668#undef elf_backend_final_write_processing
6669
6670/* VxWorks support. */
6671
6672#undef TARGET_LITTLE_SYM
6673#define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6674#undef TARGET_LITTLE_NAME
6675#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6676#undef ELF_OSABI
6677#undef ELF_MAXPAGESIZE
6678#define ELF_MAXPAGESIZE 0x1000
6679#undef elf_backend_plt_alignment
6680#define elf_backend_plt_alignment 4
6681
6682static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6683 {
6684 &elf_i386_plt, /* plt */
6685 0x90, /* plt0_pad_byte */
6686 1, /* is_vxworks */
6687 };
6688
6689#undef elf_backend_arch_data
6690#define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6691
6692#undef elf_backend_relocs_compatible
6693#undef elf_backend_add_symbol_hook
6694#define elf_backend_add_symbol_hook \
6695 elf_vxworks_add_symbol_hook
6696#undef elf_backend_link_output_symbol_hook
6697#define elf_backend_link_output_symbol_hook \
6698 elf_vxworks_link_output_symbol_hook
6699#undef elf_backend_emit_relocs
6700#define elf_backend_emit_relocs elf_vxworks_emit_relocs
6701#undef elf_backend_final_write_processing
6702#define elf_backend_final_write_processing \
6703 elf_vxworks_final_write_processing
6704#undef elf_backend_static_tls_alignment
6705
6706/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6707 define it. */
6708#undef elf_backend_want_plt_sym
6709#define elf_backend_want_plt_sym 1
6710
6711#undef elf32_bed
6712#define elf32_bed elf32_i386_vxworks_bed
6713
6714#include "elf32-target.h"
GDB Binutils - Deliverables
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